Patent Publication Number: US-11642706-B2

Title: Cleaning device

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of International Application No. PCT/CN2019/106699, filed on Sep. 19, 2019. The International Application claims priority to Chinese Patent Application No. 201920033787.X, filed on Jan. 9, 2019. Both applications are hereby incorporated by reference in their entireties. 
    
    
     TECHNICAL FIELD 
     The present application relates to display panel manufacturing technology, in particular to a cleaning device. 
     BACKGROUND 
     In the manufacturing process of the display panel, it is necessary to sequentially attach a plurality of functional film layers onto the display panel, and the display panel needs to be cleaned before the functional film layer is attached, to eliminate impurities such as particles on the display panel. In the prior art, the display panel is often cleaned by cleaning device. The cleaning device includes a base body, a worktable provided on the base body, and a spray head provided on an upper part of the worktable. The worktable has a mounting surface facing away from the base body. When using, installing a to-be-cleaned panel onto the mounting surface, and controlling the spray head to spray a cleaning gas; and moving the spray head along one end of the worktable to the other end, and blowing off particles and other impurities on the to-be-cleaned panel by the cleaning gas, so as to realize the cleaning of the to-be-cleaned panel. 
     However, when the spray head moves to an edge of the worktable, there is no any obstruction at a bottom of the spray head. Impurities in other positions of the device will be blown up by the cleaning gas sprayed by the spray head and fall onto the to-be-cleaned panel, resulting in poor cleaning effect of the to-be-cleaned panel. 
     SUMMARY 
     An embodiment of the present application provides a cleaning device to solve technical problems that when a spray head moves to an edge of a worktable, there is no any obstruction at a bottom of the spray head, and impurities in other positions of the device will be blown up by a cleaning gas sprayed by the spray head and fall onto a to-be-cleaned panel, results in poor cleaning effect of the to-be-cleaned panel. 
     An embodiment of the present application provides a cleaning device, including: 
     a base body; 
     a main worktable; 
     a spray head, configured to move in a preset direction vertical to a mounting surface to clean a to-be-cleaned panel on the mounting surface and including a nozzle facing the mounting surface of the main worktable; 
     a first auxiliary worktable that are provided on the base body and located at one end of the main worktable along the preset direction, wherein a first surface of the first auxiliary worktable facing the spray head is parallel to the mounting surface, and the first surface is higher than the mounting surface or flush with the mounting surface. 
     The cleaning device provided in embodiments of the present application is that by setting the first auxiliary worktable at one end of the main worktable along the preset direction, with the first surface of the first auxiliary worktable being parallel to the mounting surface, and the first surface being flush with the mounting surface or higher than the mounting surface; when the spray head moves to one end of the main worktable in the preset direction, the first surface can prevent the cleaning gas sprayed by the spray head from blowing to other positions of the cleaning device, thereby avoiding blowing up the particles at the other positions and improving the cleaning effect. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a first schematic structural diagram of a cleaning device provided by an embodiment of the present application. 
         FIG.  2    is a second schematic structural diagram of a cleaning device provided by an embodiment of the present application. 
         FIG.  3    is a third schematic structural diagram of a cleaning device provided by an embodiment of the present application. 
         FIG.  4    is a top view of the cleaning device provided by an embodiment of the present application. 
     
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
       FIG.  1    is a first schematic structural diagram of a cleaning device provided by an embodiment of the present application;  FIG.  2    is a second schematic structural diagram of a cleaning device provided by an embodiment of the present application;  FIG.  3    is a third schematic structural diagram of a cleaning device provided by an embodiment of the present application;  FIG.  4    is a top view of the cleaning device provided by an embodiment of the present application. 
     Referring to  FIGS.  1 - 4   , this embodiment provides a cleaning device including: a base body  20 , a spray head  10 , and a main worktable  40  and a first auxiliary worktable  30  provided on the base body  20 , where a nozzle of the spray head  10  is provided facing a mounting surface of the main worktable  40 , and the spray head  10  is configured to move in a preset direction to clean a to-be-cleaned panel  50  on the mounting surface; the first auxiliary worktable  30  is located at one end of the main worktable  40  along the preset direction, and a first surface of the first auxiliary worktable  30  facing the spray head  10  is parallel to the mounting surface, and the first surface is higher than the mounting surface or flush with the mounting surface. 
     In this embodiment, the base body  20  is set on the ground to carry the entire cleaning device; both the main worktable  40  and the first auxiliary worktable  30  are provided on the base body  20 , the spray head  10  is provided on an upper part of the main worktable  40  and the spray head  10  is arranged to be spaced apart from the main worktable  40 . The spray head  10  is configured to spray a cleaning gas to the to-be-cleaned panel  50  to remove impurities such as particles on the to-be-cleaned panel  50 , thereby realizing cleaning of the to-be-cleaned panel  50 . Preferably, the spray head  10  may spray gas such as nitrogen to the to-be-cleaned panel  50 . 
     Specifically, the spray head  10  may be connected to the base body  20  through a driving cylinder, and a center line of the driving cylinder is parallel to the preset direction; when a piston rod of the driving cylinder is extended or retracted, the spray head  10  is driven to move on the upper part of the main worktable  40  in the preset direction. Or, a driving screw is rotatably provided on the base body  20 , and an axis of the driving screw is parallel to the preset direction; a driving motor is drivably connected to the driving screw, and a driving nut matched with the driving screw is provided on the spray head  10 , so that when the driving motor drives the screw to rotate, the driving nut and the spray head  10  are driven to move in the preset direction. The spray head  10  can also be connected to the base body  20  through other apparatus, as long as the spray head  10  can be driven to move in the preset direction. 
     In this embodiment, the mounting surface of the main worktable  40  may be a plane that is provided on the top of the main worktable  40  away from the ground, and is parallel to a horizontal plane, and the mounting surface is used to install the to-be-cleaned panel  50 ; correspondingly, the first surface on the first auxiliary worktable  30  is a plane that is provided on the top of the first auxiliary worktable  30  facing away from the ground and is parallel to the horizontal plane. 
     Specifically, the first auxiliary worktable  30  may be connected to the base body  20  by bolting or snapping. The first auxiliary worktable  30  is provided at one end of the main worktable  40  along a preset direction to form a first extension of the main worktable  40 . When the spray head  10  moves to an end close to the first auxiliary worktable  30  in the preset direction, the first surface on the first auxiliary worktable  30  may block the cleaning gas, so as to prevent the cleaning gas from blowing up particles and other impurities in other positions of the cleaning device to fall on the to-be-cleaned panel  50 . 
     In this embodiment, the first surface may be flush with the mounting surface, that is, the first surface and the mounting surface are provided parallel and coplanar, and in this case, a vertical distance between the spray head  10  and the first surface is equal to a vertical distance between the spray head  10  and the mounting surface; alternatively, the first surface is higher than the mounting surface, and the first surface higher than the mounting surface may reduce a distance between the first surface and the spray head  10 , so that when the spray head  10  is moved to an end of the main worktable  40  facing the first auxiliary worktable  30 , an air flow from the spray head  10  is relatively stable. Further, a vertical distance between the first surface and the main worktable  40  is equal to a thickness of the to-be-cleaned panel  50 , so that the first surface is provided parallel and coplanar with a top surface of the to-be-cleaned panel  50  placed on the mounting surface, to further improve the stability of the air flow when the spray head  10  moves to the end of the main worktable  40  facing the end of the first auxiliary worktable  30 . 
     Exemplarily, a vertical distance between the spray head  10  and the to-be-cleaned panel  50  may be 2 μm to 3 μm. Correspondingly, the vertical distance between the mounting surface and the spray head  10  is a sum of the vertical distance between the spray head  10  and the to-be-cleaned panel and the thickness of the to-be-cleaned panel  50 . Of course, the distance between the spray head  10  and the to-be-cleaned panel  50  can also be other values, as long as the cleaning device has a good cleaning effect. 
     A working process of the cleaning device provided in this embodiment is as follows: first, the to-be-cleaned panel  50  is set on the mounting surface on the main worktable  40 , and then the spray head  10  is controlled to spray the cleaning gas and meanwhile is controlled to move in a preset direction, and during the movement of the spray head  10 , the sprayed cleaning gas blows away impurities such as particles adhered to the to-be-cleaned panel  50 , so as to realize cleaning of the to-be-cleaned panel  50 . When the spray head  10  moves to the end of the main worktable  40  facing the first auxiliary worktable  30 , the cleaning gas sprayed from the spray head  10  blows onto the first surface of the first auxiliary worktable  30 . The first surface prevents the cleaning gas from blowing onto other positions of the cleaning device, and thus avoids blowing up particles and other impurities at the other positions of the cleaning device. 
     The cleaning device provided in the embodiments of the present application is that by setting the first auxiliary worktable  30  at one end of the main worktable  40  along the preset direction, with the first surface on the first auxiliary worktable  30  being parallel to the mounting surface, and the first surface being flush with the mounting surface or higher than the mounting surface; when the spray head  10  moves to the end of the main worktable  40  facing the first auxiliary worktable  30  in the preset direction, the first surface can prevent the cleaning gas sprayed by the spray head  10  from blowing to other positions of the cleaning device, thereby avoiding particles at the other positions to be blown up, and improving the cleaning effect. 
     In this embodiment, the first auxiliary worktable  30  is connected to the base body  20  through a first lifting apparatus. The first lifting apparatus is used to drive the first auxiliary worktable  30  to move in a direction vertical to the first surface. The distance between the first surface and the mounting surface can be adjusted by the first lifting apparatus to ensure that the first surface is flush with the top surface of the to-be-cleaned panel  50  installed on the mounting surface; the display panels with different thicknesses can be cleaned, which improves the versatility of cleaning device. 
     Exemplarily, the first lifting apparatus drives the first auxiliary worktable  30  to move in a range of 0 mm to 3 mm in a direction vertical to the first surface. Preferably, the first lifting apparatus drives the first auxiliary worktable  30  to move in a range of 1 mm in a direction vertical to the first surface. 
     Referring to  FIG.  2   , in a feasible embodiment, the first lifting apparatus may include a first lifting bolt  301 , and a first threaded hole provided on the base body  20  and having a center line vertical to the first surface, where the first lifting bolt  301  can be screwed into the first threaded hole, and the first lifting bolt  301  abuts against the first auxiliary worktable  30 ; by twisting the first lifting bolt  301 , the first auxiliary worktable  30  can be driven to move in a direction vertical to the first surface. 
     Further, the first lifting apparatus further includes a first locking nut  303  fitted with the first lifting bolt  301 . After adjusting the height of the first auxiliary worktable  30  by twisting the first lifting bolt  301 , the first locking nut  303  is tightened, so that the first locking nut  303  abuts against the base body  20 , and then a friction between the first locking nut  303  and the base body  20  prevents the first lifting bolt  301  from rotating, in order to avoid the rotation of the first lifting bolt  301  caused by the shaking of the base body  20  during cleaning, and thus height change of the first auxiliary worktable  30 . 
     Referring to  FIG.  3   , in other embodiments, the first lifting apparatus may further include a first telescopic cylinder  305 , and the cylinder body of the first telescopic cylinder  305  is connected to the base body  20 , and a piston rod of the first telescopic cylinder  305  is connected to the first auxiliary worktable  30 , so that when the piston rod of the first telescopic cylinder  305  is extended out from the cylinder body, the first auxiliary worktable  30  is driven to move upward, and when the piston rod of the first telescopic cylinder  305  is retracted towards the cylinder body, the first auxiliary worktable  30  is driven to move downwards. 
     In this embodiment, the main worktable  40  may be provided with a first slide rail, and a center line of the first slide rail is vertical to the mounting surface. The first auxiliary worktable  30  is provided with a first slide groove, and the first slide rail is slidably provided in the first slide groove, so as to improve the stability of the first auxiliary worktable  30 . 
     In this embodiment, the cleaning device further includes a second auxiliary worktable  60 . The second auxiliary worktable  60  is provided at the other end of the main worktable  40  along a preset direction, and a second surface of the second auxiliary worktable  60  towards the spray head  10  is parallel to the mounting surface. The second surface is higher than the mounting surface or flush with the mounting surface. The first auxiliary worktable  30  is located at one end of the main worktable  40  in the preset direction, and the second auxiliary worktable  60  is located at the other end of the main worktable  40  in the preset direction, so that when the spray head  10  moves to both ends of the main worktable  40  in the preset direction, the gas sprayed by the spray head  10  will be blocked, so as to avoid blowing up particles and other impurities in other positions of the cleaning device, so as to further improve the cleaning effect of the cleaning device. Preferably, the spray head  10  can be moved back and forth in a preset direction to perform multiple cleanings on the to-be-cleaned panel  50 , which can further improve the cleaning effect. 
     In this embodiment, the second auxiliary worktable  60  is provided at the other end of the main worktable  40  along the preset direction, that is, the second auxiliary worktable  60  is a second extension portion outward from the other end of the main worktable  40 . The second surface of the second auxiliary worktable  60  may be flush with the mounting surface, that is, the second surface and the mounting surface is provided parallel and coplanar. At this time, a distance between the spray head  10  and the second surface is equal to a distance between the spray head  10  and the mounting surface; or the second surface is higher than the mounting surface; the second surface higher than the mounting surface can reduce the distance between the second surface and the spray head  10 , so that when the spray head  10  moves to the other end of the main worktable  40 , the air flow sprayed from the spray head  10  is relatively stable. Further, a distance between the second surface and the main worktable  40  is equal to a thickness of the to-be-cleaned panel  50 , so that the second surface is parallel to and coplanar with the top surface of the to-be-cleaned panel  50  placed on the mounting surface, to further improve the stability of the air flow when the spray head  10  moves to the other end of the main worktable  40 . 
     In this embodiment, the first surface and the second surface may be provided parallel and coplanar, or provided parallel and non-coplanar. 
     In this embodiment, the second auxiliary worktable  60  is connected to the base body  20  through a second lifting apparatus. The second lifting apparatus is used to drive the second auxiliary worktable  60  to move in a direction vertical to the second surface. The distance between the second surface and the mounting surface can be adjusted by the second lifting apparatus to ensure that the second surface is flush with the top surface of the to-be-cleaned panel  50  installed on the mounting surface; the to-be-cleaned panels  50  with different thicknesses can be cleaned, which improves the versatility of the cleaning device. 
     Exemplarily, the second lifting apparatus drives the second auxiliary worktable  60  to move in a direction vertical to the second surface in a range of 0 mm to 3 mm. Preferably, the second lifting apparatus drives the second auxiliary worktable  60  to move in a direction vertical to the second surface in a range of 1 mm. 
     Referring to  FIG.  2   , in a feasible embodiment, the second lifting apparatus may include a second lifting bolt  302 , and a second threaded hole that is provided on the base body  20  and having a center line vertical to the second plane, and the second lifting bolt  302  can be screwed into the second threaded hole, and the second lifting bolt  302  abuts against the second auxiliary worktable  60 ; by twisting the second lifting bolt  302 , the second auxiliary worktable  60  can be driven to move in a direction vertical to the second plane. 
     Further, the second lifting apparatus further includes a second locking nut  304  fitted with the second lifting bolt  302 . After adjusting the height of the second auxiliary worktable  60  by twisting the second lifting bolt  302 , the second locking nut  304  is tightened, so that the second locking nut  304  abuts against the base body  20 , and then the friction between the second locking nut  304  and the base body  20  prevents the second lifting bolt  302  from rotating, so as to avoid the rotation of the second lifting bolt  302  caused by the shaking of the base body  20  during cleaning, and thus height change of the second auxiliary worktable  60 . 
     Referring to  FIG.  3   , in other embodiments, the second lifting apparatus may further include a second telescopic cylinder  306 , and a cylinder body of the second telescopic cylinder  306  is connected to the base body  20 , and a piston rod of the second telescopic cylinder  306  is connected to the second auxiliary worktable  60 , so that when the piston rod of the second telescopic cylinder  306  is extended out from the cylinder body, the second auxiliary worktable  60  is driven to move upward, and when the piston rod of the second telescopic cylinder  306  is retracted towards the cylinder body, the second auxiliary worktable  60  is driven to move downwards. 
     In this embodiment, a second slide rail may be provided on the main worktable  40 , and a center line of the second slide rail is vertical to the mounting surface. The second auxiliary worktable  60  is provided with a second slide groove, and the second slide rail is slidably provided in the second slide groove, so as to improve the stability of the second auxiliary worktable  60 . 
     Referring to  FIG.  4   , in this embodiment, the cleaning device further includes a plurality of supporting columns  401 . The main worktable  40  is provided with a plurality of telescopic holes  402  whose center lines are vertical to the mounting surface and each supporting column  401  is provided in one telescopic hole  402 ; the supporting columns  401  are connected to the main worktable  40  through a telescopic apparatus, the telescopic apparatus is used to drive the supporting column  401  extending out from or retracting into the telescopic hole  402 . 
     When using, first, the supporting columns  401  are driven to extend out from the telescopic holes  402  by the telescopic apparatus, then the to-be-cleaned panel  50  is placed on tops of the supporting columns  401 , and then the supporting columns  401  are driven to retract into the telescopic holes  402  by the telescopic apparatus so that the to-be-cleaned panel  50  falls on the mounting surface. On the contrary, after cleaning, the supporting columns  401  are driven by the telescopic apparatus to extend out from the telescopic holes  402 , and then each supporting column  401  abuts against the to-be-cleaned panel  50 , so that the to-be-cleaned panel  50  is separated from the mounting surface, and then the to-be-cleaned panel  50  is removed from the supporting columns  401 . This facilitates placement and removal of the to-be-cleaned panel  50 . 
     Further, there may be various types of telescopic apparatus, as long as the supporting columns  401  can be driven to extend out from or retract into the telescopic holes  402  into the telescopic hole  402 . For example, the telescopic apparatus may include cylinders, the cylinders and the supporting columns  401  are all provided in the telescopic holes  402 , the cylinder bodies of the cylinders are connected to the main worktable  40 , and piston rods of the cylinders are connected to the supporting columns  401 . When the piston rods extend out from the cylinders, the supporting columns  401  are driven to extend out from the telescopic holes  402 ; when the piston rods retract into the cylinders, the supporting columns  401  are driven to retract into the telescopic holes  402 . The telescopic apparatus may also include hydraulic cylinders and the like. 
     Referring to  FIG.  4   , in this embodiment, the cleaning device further includes at least one detection apparatus  403  provided on the main worktable  40 . The detection device  403  is used to detect the to-be-cleaned panel  50 . When the detection apparatus  403  detects that the supporting columns  401  have the to-be-cleaned panel  50 , the supporting columns are controlled to retract into the telescopic holes  402 . The detection apparatus  403  can detect whether there is the to-be-cleaned panel  50  on the supporting columns  401 , so as to control the supporting columns  401 . 
     Exemplarily, when the detection apparatus  403  does not detect the to-be-cleaned panel  50 , the telescopic apparatus is controlled to drive the supporting columns  401  to extend out from the telescopic holes  402  to receive the to-be-cleaned panel  50 ; when the detection apparatus  403  detects the presence of the to-be-cleaned panel  50  on the supporting columns  401 , the telescopic apparatus is controlled to drive the supporting columns  401  to retract into the telescopic holes  402 , so that the to-be-cleaned panel  50  falls on the mounting surface. 
     There may be various types of detection apparatuses  403  in this embodiment. For example, the detection apparatus  403  may include an infrared emitter and an infrared receiver, and both the infrared emitter and the infrared receiver are provided on the main worktable  40 . When there is the to-be-cleaned panel  50  on the supporting columns  401 , infrared rays emitted by the infrared emitter are reflected by the to-be-cleaned panel  50  and then received by the infrared receiver; when there is no to-be-cleaned panel  50  on the supporting columns  401 , the infrared receiver cannot receive the infrared rays. The detection apparatus  403  may further include a button. When there is the to-be-cleaned panel  50  on the supporting columns  401 , the to-be-cleaned panel  50  presses the button, and then it is detected that there is the to-be-cleaned panel  50  on the supporting columns  401 . At this time, the detection apparatus  403  is movably provided along the mounting surface vertical to the main worktable  40 . A driving structure of the detection apparatus  403  can refer to the driving structures of the supporting columns  401 . 
     Referring to  FIG.  4   , in this embodiment, the cleaning device further includes a plurality of limiting members  404  provided on the main worktable  40  and surrounding the mounting surface. The limiting members  404  are connected to the main worktable  40  through a moving apparatus. The moving apparatus is used for driving the limiting members  404  to move, so that the limiting members  404  abut against the to-be-cleaned panel  50 , and then adjusts the position of the to-be-cleaned panel  50  on the main worktable  40  so that the spray head  10  is facing the to-be-cleaned panel  50 . 
     In this embodiment, the limiting members  404  each may include a column and a wear resistant part provided at the top of the column. The wear resistant part is in contact with the to-be-cleaned panel  50  to prevent the to-be-cleaned panel  50  from scratching the limiting members  404 , resulting in insufficient dimensional accuracy of the limiting members  404 . Preferably, the wear resistant part may be mainly composed of polyetheretherketone. The wear resistant part can also be composed of other wear resistant material. 
     The limiting members  404  in this embodiment may move in a direction parallel to the preset direction, or in a direction parallel to the mounting surface and vertical to the preset direction, so as to adjust the position of the to-be-cleaned panel  50 . In addition, the limiting members  404  can also move in a direction vertical to the mounting surface, to adjust heights of the limiting members  404 . 
     Exemplarily, the limiting members  404  each includes a first main body and a second main body, and the first main body may be connected to the base body  20  through a first driving apparatus. The first driving apparatus may be an apparatus capable of driving the first main body to move in a direction parallel to the preset direction, e.g., a hydraulic cylinder, an air cylinder, an electric push rod, etc.; the second main body and the first main body are connected by a second driving apparatus, and the second driving apparatus may be an apparatus capable of driving the second main body to move in a direction parallel to the mounting surface and vertical to the preset direction, e.g., a hydraulic cylinder, an air cylinder, an electric push rod, etc.; the column is connected to the second main body through a third driving apparatus. The third driving apparatus may be an apparatus capable of driving the column to move in a direction vertical to the mounting surface, e.g., a hydraulic cylinder, an air cylinder, or the like. 
     When working, the column is driven by the third driving apparatus to move upward, so that the wear resistant part on the column is flush with the to-be-cleaned panel  50 ; after that, the first driving apparatus and/or the second driving apparatus are operated to drive the first main body and the second main body to move in a preset direction, and/or drive the second main body to move in a direction parallel to the mounting surface and vertical to the preset direction, so that the wear resistant part abuts against an edge of the to-be-cleaned panel  50 , so as to drive the to-be-cleaned panel  50  to move, so as to adjust a position of the to-be-cleaned panel  50 . 
     Referring to  FIG.  4   , in this embodiment, the end of the first auxiliary worktable  30  facing the main worktable  40  is provided with a first recessed portion, and the end of the main worktable  40  facing the first auxiliary worktable  30  is provided with a second recessed portion. The first recessed portion and the second recessed portion surround to form a receiving groove  405 , and in the limiting members a limiting member  404  between the main worktable  40  and the first auxiliary worktable  30  is provided in the receiving groove  405 . When cleaning, the limiting member  404  is controlled by the movement of the moving apparatus to retract into the receiving groove  405 , preventing the limiting member  404  from blocking the movement of the spray head  10  during cleaning. 
     Further, a third recessed portion is provided at an end of the second auxiliary worktable  60  facing the main worktable  40 , and a fourth recessed portion is provided at an end of the main worktable  40  facing the second auxiliary worktable  60 . The third recessed portion and the fourth recessed portion surround to form a receiving groove  405 , and in the limiting members a limiting member  404  between the main worktable  40  and the second auxiliary worktable  60  is provided in the receiving groove  405 . This can prevent the limiting member between the second auxiliary worktable  60  and the main worktable  40  from blocking the movement of the spray head  10 . 
     A using process of the cleaning device provided in this embodiment is: first, the supporting columns  401  are driven by the telescopic apparatus to extend out of the telescopic hole  402  to receive the to-be-cleaned panel  50 ; after that, the to-be-cleaned panel  50  is placed on the tops of the supporting columns  401 ; after that, the moving apparatus drives the limiting members  404  to extend away from the mounting surface, and makes the wear resistant part of the limiting members  404  face the edge of the to-be-cleaned panel  50 ; after that, the driving limiting members  404  are moved in a preset direction and/or a direction parallel to the mounting surface and vertical to the preset direction by the moving apparatus, and the wear resistant part abuts against the edge of the to-be-cleaned panel  50  to adjust the position of the to-be-cleaned panel  50 ; afterwards, the supporting columns  401  are retracted into the telescopic holes  402  by the telescopic apparatus to place the to-be-cleaned panel  50  on the mounting surface, and the limiting member  404  between the first auxiliary worktable  30  and the main worktable  40  and the limiting member  404  between the second auxiliary worktable  60  and the main worktable  40  are retracted into corresponding receiving grooves  405 ; after that, the first auxiliary worktable  30  is driven by the first lifting apparatus to move in a direction vertical to the mounting surface, so that the first surface is flush with the top surface of the to-be-cleaned panel  50 , and at the same time, the second auxiliary worktable  60  is driven by the second lifting apparatus to move in a direction vertical to the mounting surface, so that the second surface is flush with the top surface of the to-be-cleaned panel  50 ; after that, the spray head  10  is sprayed with a cleaning gas, and the spray head is moved in a preset direction to clean the to-be-cleaned panel  50 ; after the cleaning is completed, the supporting columns  401  are driven by the telescopic apparatus to extend out of the telescopic holes  402  to move upward against the to-be-cleaned panel  50 , so that the to-be-cleaned panel  50  is separated from the mounting surface. 
     Finally, it should be noted that the above embodiments are only to illustrate the technical solutions of the present application, and not to limit them; although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand: they can still modify the technical solutions described in the foregoing embodiments, or equivalently replace some or all of the technical features therein; however, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.