Patent Publication Number: US-2019193166-A1

Title: Wheel spraying protection device

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is filed based upon and claims priority to Chinese Patent Application No. 201711417006.9, filed on Dec. 25, 2017, the contents of which are hereby incorporated by reference in its entirety. 
     BACKGROUND 
     When paint is sprayed to a wheel, it requires no paint on a center hole, a flange mounting face and bolt hole mounting conical surfaces, so these parts must be protected during spraying. At present, the flange face is usually fitted with a tray by means of self weight of the wheel to protect the flange face, the center hole is protected by adopting a spring cone or an expansion sleeve, plastic plugs are directly put into bolt holes to protect the bolt hole conical surfaces, and such protection methods have many disadvantages in actual production: (1) the flange face of the wheel cannot be completely fitted with the tray by means of self weight of the wheel only, the wheel may rotate at a low speed and move forward during spraying, and the wheel slightly shakes and moves, thus not only causing the defect that the flange face is adhered with the paint, but also causing non-uniform thickness of a film sprayed on the wheel; (2) the wheel cannot be stable by adopting the spring cone to protect the center hole, the fixation problem of the wheel is solved by adopting the expansion sleeve to protect the center hole, but the stroke of the expansion sleeve is limited, and expansion sleeves having many specifications are needed in actual production, so the manufacturing cost is increased; and (3) when the plastic plugs are directly put into bolt holes to protect the bolt hole conical surfaces, the plastic plugs cannot be ensured to completely fit the bolt hole conical surfaces, the defect that the bolt hole conical surfaces are adhered with the paint easily appears to cause customer complaints, and when the spraying is completed, the plastic plugs are unlikely to take out from the bolt holes. Based on the current situation, this patent provides a brand-new wheel spraying protection device, which can eliminate all above disadvantages and solve the problem that the flange face, the center hole and the bolt hole conical surfaces are adhered with the paint. 
     SUMMARY 
     The disclosure relates to the technical field of wheel spraying protection, and specifically, to a device capable of protecting a center hole, a flange face and bolt hole conical surfaces of a wheel. 
     A wheel spraying protection device is provided, which plays a role in protecting during a wheel spraying process and solves the problem that a flange face, a center hole and bolt hole conical surfaces are adhered with paint. The device has the characteristics of advanced process, easiness in manufacturing, simple structure, strong function and the like. 
     In some embodiments of the disclosure, a wheel spraying protection device is composed of a hollow mounting rack, an electric cylinder, a tray, an electromagnetic chuck, a sleeve, a piston, a soft rubber cover, a support column, an end cover, high temperature resistant plastic protective plugs, springs and iron posts. 
     The hollow mounting rack is used for mounting the device on an automatic spraying line, the tray is mounted above the hollow mounting rack and fixed via reinforcing ribs, the electromagnetic chuck is embedded into the tray, the electric cylinder is fixed inside the hollow mounting rack, the output end of the electric cylinder is connected with the piston, the piston is matched with the inner wall of the sleeve, the outer wall of the sleeve is in tight fit with the hollow mounting rack, the tray and the electromagnetic chuck, the upper end face of the sleeve is connected with the electromagnetic chuck via screws, and the sleeve is thus fixed. The lower end of the support column is fixed on the sleeve, the upper end of the support column is fixed on the end cover, the space formed by the end cover and the sleeve is sealed by the soft rubber cover, and the medium in the sleeve is air. 
     When the electric cylinder propels the piston to move up, the closed space in the sleeve is reduced, the soft rubber cover is expanded by air extrusion, and the expanded soft rubber cover is in tight fit with the inner wall of a center hole of a wheel to protect the center hole; when the electric cylinder propels the piston to move down, the closed space in the sleeve is enlarged, and the soft rubber cover can contract, leave the inner wall of the center hole and restore to the initial state. Compared with a method of protecting the center hole by an expansion sleeve, this protection method is large in protection range and strong in universality and greatly reduces the manufacturing cost. 
     The upper end of the spring is fixed on the high temperature resistant plastic protective plug, and the lower end is free. During protection, the lower end face of the spring is in contact with the bottom surface of a bolt hole counter bore of the wheel, and when the conical surface of the high temperature resistant plastic protective plug is fitted with the conical surface of a bolt hole, the spring is in a compressed state. The iron post is fixed at the lower end of the high temperature resistant plastic protective plug. 
     The using method of the wheel spraying protection device is: firstly, a wheel is put on the device, the electric cylinder is started to drive the piston to move up, the soft rubber cover is expanded to protect the center hole of the wheel; then, the electromagnetic chuck is powered on, the high temperature resistant plastic protective plug is put into a bolt hole and pressed with certain strength, and when the conical surface of the high temperature resistant plastic protective plug is in tight fit with the conical surface of the bolt hole, the spring is in a compressed state; due to the suction of the electromagnetic chuck, the iron post is in tight fit with the electromagnetic chuck; after all the high temperature resistant plastic protective plugs are put into the bolt holes, the wheel is firmly fixed on the electromagnetic chuck, at the moment, not only is the flange face of the wheel completely fitted with the plane of the electromagnetic chuck, but also the conical surfaces of the high temperature resistant plastic protective plugs are in tight fit with the bolt hole conical surfaces, so that the flange face and the bolt holes conical surfaces are protected. This protection method can fulfill the purpose of tight fit, and can also solve the problem that the wheel slightly shakes and moves. After the wheel is sprayed, the soft rubber cover is contacted and restored, the electromagnetic chuck is powered off, and the high temperature resistant plastic protective plugs are easily taken out of the bolt holes under the action of elasticity of the springs, thereby solving the problem that the protective plugs are unlikely to take out due to paint adhesion. 
     The disclosure can play a role in protecting during the wheel spraying process, and solves the problem that the flange face, the center hole and the bolt hole conical surfaces are adhered with paint. The device has the characteristics of advanced process, easiness in manufacturing, simple structure, strong function and the like. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a front view of a wheel spraying protection device of the disclosure. 
         FIG. 2  is a top view of the wheel spraying protection device of the disclosure. 
         FIG. 3  is a schematic diagram of the wheel spraying protection device of the disclosure during protection. 
     
    
    
     In which,  1 -hollow mounting rack,  2 -electric cylinder,  3 -tray,  4 -electromagnetic chuck,  5 -sleeve,  6 -piston,  7 -soft rubber cover,  8 -support column,  9 -end cover,  10 -high temperature resistant plastic protective plug,  11 -spring,  12 -iron post. 
     DETAILED DESCRIPTION 
     Details and working conditions of the specific device provided by the disclosure will be given below in combination with the accompanying drawings. 
     A wheel spraying protection device is composed of a hollow mounting rack  1 , an electric cylinder  2 , a tray  3 , an electromagnetic chuck  4 , a sleeve  5 , a piston  6 , a soft rubber cover  7 , a support column  8 , an end cover  9 , high temperature resistant plastic protective plugs  10 , springs  11  and iron posts  12 . 
     The hollow mounting rack  1  is used for mounting the device on an automatic spraying line, the tray  3  is mounted above the hollow mounting rack  1  and fixed via reinforcing ribs, the electromagnetic chuck  4  is embedded into the tray  3 , the electric cylinder  2  is fixed inside the hollow mounting rack  1 , the output end of the electric cylinder  2  is connected with the piston  6 , the piston  6  is matched with the inner wall of the sleeve  5 , the outer wall of the sleeve  5  is in tight fit with the hollow mounting rack  1 , the tray  3  and the electromagnetic chuck  4 , the upper end face of the sleeve  5  is connected with the electromagnetic chuck  4  via screws, and the sleeve  5  is thus fixed. The lower end of the support column  8  is fixed on the sleeve  5 , the upper end of the support column  8  is fixed on the end cover  9 , the space formed by the end cover  9  and the sleeve  5  is sealed by the soft rubber cover  7 , and the medium in the sleeve  5  is air. 
     When the electric cylinder  2  propels the piston  6  to move up, the closed space in the sleeve  5  is reduced, the soft rubber cover  7  is expanded by air extrusion, and the expanded soft rubber cover  7  is in tight fit with the inner wall of a center hole of a wheel to protect the center hole; when the electric cylinder  2  propels the piston  6  to move down, the closed space in the sleeve  5  is enlarged, and the soft rubber cover  7  can contract, leave the inner wall of the center hole and restore to the initial state. Compared with a method of protecting the center hole by an expansion sleeve, this protection method is large in protection range and strong in universality and greatly reduces the manufacturing cost. 
     The upper end of the spring  11  is fixed on the high temperature resistant plastic protective plug  10 , and the lower end is free. During protection, the lower end face of the spring  11  is in contact with the bottom surface of a bolt hole counter bore of the wheel, and when the conical surface of the high temperature resistant plastic protective plug  10  is fitted with the conical surface of a bolt hole, the spring  11  is in a compressed state. The iron post  12  is fixed at the lower end of the high temperature resistant plastic protective plug  10 . 
     The using method of the wheel spraying protection device is: firstly, a wheel is put on the device, the electric cylinder  2  is started to drive the piston  6  to move up, the soft rubber cover  7  is expanded to protect the center hole of the wheel; then, the electromagnetic chuck  4  is powered on, the high temperature resistant plastic protective plug  10  is put into a bolt hole and pressed with certain strength, and when the conical surface of the high temperature resistant plastic protective plug  10  is in tight fit with the conical surface of the bolt hole, the spring  11  is in a compressed state; due to the suction of the electromagnetic chuck  4 , the iron post  12  is in tight fit with the electromagnetic chuck  4 ; after all the high temperature resistant plastic protective plugs  10  are put into the bolt holes, the wheel is firmly fixed on the electromagnetic chuck  4 , at the moment, not only is the flange face of the wheel completely fitted with the plane of the electromagnetic chuck  4 , but also the conical surfaces of the high temperature resistant plastic protective plugs  10  are in tight fit with the bolt hole conical surfaces, so that the flange face and the bolt holes conical surfaces are protected. This protection method can fulfill the purpose of tight fit, and can also solve the problem that the wheel slightly shakes and moves. After the wheel is sprayed, the soft rubber cover  7  is contacted and restored, the electromagnetic chuck  4  is powered off, and the high temperature resistant plastic protective plugs  10  are easily taken out of the bolt holes under the action of elasticity of the springs  11 , thereby solving the problem that the protective plugs are unlikely to take out due to paint adhesion. 
     The disclosure can play a role in protecting during the wheel spraying process, and solves the problem that the flange face, the center hole and the bolt hole conical surfaces are adhered with paint. The device has the characteristics of advanced process, easiness in manufacturing, simple structure, strong function and the like.