Vehicle sign base plate polishing device

Abstract

The invention belongs to the field of vehicle accessory machining, and particularly relates to a vehicle sign base plate polishing device which comprises a polishing groove, the polishing groove comprises a bottom box, a vibration groove is formed in the top of the bottom box, and a pressing plate is arranged at a groove opening of the vibration groove. A driving mechanism used for driving the pressing plate to do reciprocating translational motion in the length direction of the vibration groove is arranged above the polishing groove. The polishing chamber is filled with a polishing auxiliary medium; a vibration groove is formed in the bottom box, a plurality of loading vibration mechanisms used for loading and vibrating the vehicle sign base plate are arranged in the vibration groove, each loading vibration mechanism comprises a rigid plate and a lap joint plate, ultrasonic vibrators are fixedly installed below the rigid plates, and a plurality of megasonic vibrators are fixedly installed below the top of the bottom box. According to the polishing device for the vehicle sign base plates, a large number of vehicle sign base plates can be polished at a time, even if a large number of protruding areas exist on the surfaces of the vehicle sign base plates, effective polishing can be conducted, the polishing uniformity is good, the polishing efficiency is high, and the polishing quality is high.

Description

Technical Field

[0001] The invention belongs to the technical field of vehicle parts processing, and in particular relates to a vehicle sign substrate polishing device. Background Art

[0002] In the field of vehicle sign processing for electric vehicles, motorcycles and other vehicles, when reflective film needs to be affixed to the vehicle sign, it is usually necessary to perform rough polishing on the metal-based vehicle sign so that the surface of the vehicle sign reaches a certain roughness. For example, the surface roughness is 2.83±0.2μm, which can generally be achieved by grinding and polishing an aluminum plate with a surface roughness of 1.6±0.1μm. However, there will be some raised areas such as raised words and patterns on the surface of the vehicle sign substrate, which greatly affects the grinding and polishing of the vehicle sign substrate; especially near the raised areas, grinding and polishing are particularly difficult, or laser texturing equipment is required for texturing, and the equipment purchase cost is high.

[0003] Based on this, the present invention is proposed. Summary of the invention

[0004] The object of the present invention is to provide a vehicle sign substrate polishing device to solve the above-mentioned problems.

[0005] A polishing device for a vehicle sign substrate comprises a polishing trough, the polishing trough comprises a bottom box, a vibration trough is arranged on the top of the bottom box, a pressure plate is arranged at the notch of the vibration trough, and an opening for the pressure plate to move is arranged on the top of the vibration trough; a driving mechanism for driving the pressure plate to perform reciprocating translational motion along the length direction of the vibration trough is arranged above the polishing trough; a polishing chamber is formed between the pressure plate and the vibration trough, and the polishing chamber is filled with a polishing auxiliary medium; a plurality of loading vibration mechanisms for loading and vibrating the vehicle sign substrate are arranged inside the vibration trough, the loading vibration mechanisms comprise rigid plates respectively embedded on the left and right sides of the vibration trough, and a lap plate connected to the two rigid plates, one end of the rigid plate is located in the polishing chamber, and the other end of the rigid plate is located on the outside of the vibration trough, an ultrasonic vibrator is fixedly installed below the rigid plate, the ultrasonic vibrator is located on the outside of the vibration trough, and a loading trough for loading the vehicle sign substrate is arranged in the middle section of the lap plate; a plurality of megasonic vibrators are fixedly installed below the top of the bottom box.

[0006] A further improvement is that the driving mechanism includes a vertical plate, a servo motor, a rotating wheel, a sector gear, a guide rod arranged parallel to the pressure plate, and a connecting plate for connecting the pressure plate and the guide rod, the outer sleeve of the guide rod is provided with a sliding sleeve, and the sliding sleeve is fixedly connected to the vertical plate; a rack portion meshing with the sector gear is provided in the middle portion of the guide rod, and a swing arm is integrally connected to the end of the sector gear away from its tooth portion, and a first shaft is installed at the connection between the swing arm and the sector gear, the first shaft is rotatably connected to the vertical plate, the swing arm is provided with a long hole along its length direction, a second shaft is fixedly connected to the center of the rotating wheel, the second shaft is rotatably connected to the vertical plate, the second shaft is driven to rotate by the servo motor, and a convex shaft matching the long hole is provided on the edge of the rotating wheel.

[0007] As a further improvement, when the vertical projections of the convex shaft, the second shaft and the first shaft are collinear, the connecting line of the vertical projections of the convex shaft, the second shaft and the first shaft is arranged perpendicular to the vertical projection of the rack portion.

[0008] As a further improvement, a heat exchange chamber is provided inside the bottom box, a cooling water inlet connected to the heat exchange chamber is provided at the bottom of the bottom box, and a cooling water outlet connected to the heat exchange chamber is provided at the top of the bottom box.

[0009] As a further improvement, the driving mechanism also includes a lifting cylinder for driving the vertical plate to move up and down.

[0010] As a further improvement, a plurality of convex ribs are arranged on the lower surface of the pressing plate at equal intervals along the length direction of the pressing plate, the convex ribs are elliptical structures, and the long axis direction of the convex ribs is arranged perpendicular to the length direction of the pressing plate; the thickness of the convex ribs is 1.5 to 2.5 mm.

[0011] As a further improvement, the polishing auxiliary medium is composed of a mixture of abrasive, starch, graphite powder and water in a mass ratio of 1:2:0.3:1.

[0012] As a further improvement, the megasonic frequency of the megasonic vibrator is 0.8-1 MHz, and the megasonic frequencies of two adjacent megasonic vibrators are different; and the ultrasonic frequency of the ultrasonic vibrator is 20 kHz.

[0013] As a further improvement, the vibration trough is made of beryllium bronze, and the rigid plate is made of gray cast iron.

[0014] As a further improvement, there is a clearance fit between the vehicle sign base plate and the loading slot.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The vehicle sign substrate polishing device of the present invention can polish a large number of vehicle sign substrates at one time, and can effectively polish even if there are a large number of raised areas on the surface of the vehicle sign substrate, with good polishing uniformity, high polishing efficiency and high polishing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the vehicle sign substrate polishing device of the present invention;

[0018] Figure 2 It is a schematic diagram of the structure of the polishing tank of the present invention;

[0019] Figure 3 It is a structural schematic diagram of the driving mechanism of the present invention;

[0020] Figure 4 It is a structural schematic diagram of the pressing plate described in the present invention. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0022] In the description of the present invention, it should be noted that, unless otherwise specified, "multiple" means two or more than two; the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] Example 1

[0025] like Figures 1 to 4As shown, the polishing device for a vehicle sign substrate comprises a polishing tank 10, the polishing tank 10 comprises a bottom box 11, a vibration tank 12 is arranged on the top of the bottom box 11, a pressing plate 17 is arranged at the notch of the vibration tank 12, and an opening for the pressing plate 17 to move is arranged on the top of the vibration tank 12; a driving mechanism 20 for driving the pressing plate 17 to perform reciprocating translational motion along the length direction of the vibration tank 12 is arranged above the polishing tank 10; a polishing chamber 121 is formed between the pressing plate 17 and the vibration tank 12, and the polishing chamber 121 is filled with a polishing auxiliary medium; a plurality of polishing mediums for polishing the vehicle sign are arranged inside the vibration tank 12 A loading vibration mechanism is provided for loading and vibrating a vehicle sign substrate 30, the loading vibration mechanism comprising rigid plates 13 respectively embedded in the left and right sides of the vibration groove 12, and a lap plate 15 connected to the two rigid plates 13, one end of the rigid plate 13 is located in the polishing chamber 121, and the other end of the rigid plate 13 is located outside the vibration groove 12, an ultrasonic vibrator 16 is fixedly installed below the rigid plate 13, and the ultrasonic vibrator 16 is located outside the vibration groove 12, a loading groove 151 for loading the vehicle sign substrate 30 is provided in the middle section of the lap plate 15; a plurality of megasonic vibrators 18 are fixedly installed below the top of the bottom box 11.

[0026] The driving mechanism 20 includes a vertical plate 21, a servo motor, a rotating wheel 27, a sector gear 25, a guide rod 22 arranged parallel to the pressure plate 17, and a connecting plate 24 used to connect the pressure plate 17 and the guide rod 22. The guide rod 22 is provided with a sliding sleeve 23 on the outside, and the sliding sleeve 23 is fixedly connected to the vertical plate 21; a rack portion 221 meshing with the sector gear 25 is provided in the middle of the guide rod 22, and the end of the sector gear 25 away from its tooth portion is integrally connected with a swing arm 26. A first shaft 251 is installed at the connection between the swing arm 26 and the fan gear 25. The first shaft 251 is rotatably connected to the vertical plate 21. The swing arm 26 is provided with a long hole 261 along its length direction. A second shaft 272 is fixedly connected to the center of the rotating wheel 27. The second shaft 272 is rotatably connected to the vertical plate 21. The second shaft 272 is driven to rotate by a servo motor. A convex shaft 271 adapted to the long hole 261 is provided on the edge of the rotating wheel 27.

[0027] When the vertical projections of the convex shaft 271 , the second shaft 272 and the first shaft 251 are collinear, the connecting line of the vertical projections of the convex shaft 271 , the second shaft 272 and the first shaft 251 is perpendicular to the vertical projection of the rack portion 221 .

[0028] In the present invention, vertical projection refers to projection onto the same vertical plane.

[0029] When the servo motor rotates at a constant speed, it drives the wheel 27 to rotate at a constant speed. At the same time, due to the cooperation between the convex shaft 271 and the long hole 261, the swing arm 26 can swing back and forth. Due to the principle of leverage, the swing arm 26 drives the sector gear 25 to swing as well, thereby driving the rack part 221, the guide rod 22 and the pressure plate 17 to reciprocate. In this mechanism, during one cycle of the wheel 27, the guide rod 22 must have a quick return motion within one reciprocating cycle; specifically: Figure 3 According to the principle of mechanics, the position of the convex shaft 271 is the highest point. When the convex shaft 271 moves to the vicinity of the lowest point, a quick return motion will occur.

[0030] In the present invention, the surface roughness after polishing mainly depends on the particle size of the abrasive. Therefore, polishing with different roughness can be achieved by replacing abrasives with different particle sizes.

[0031] The lower surface of the pressing plate 17 is provided with a plurality of convex ribs 171 at equal intervals along the length direction of the pressing plate 17 . The convex ribs 171 are elliptical structures, and the long axis direction of the convex ribs 171 is perpendicular to the length direction of the pressing plate 17 . The thickness of the convex ribs 171 is 1.5 to 2.5 mm.

[0032] The polishing auxiliary medium is composed of abrasive, starch, graphite powder and water mixed in a mass ratio of 1:2:0.3:1.

[0033] The megasonic frequency of the megasonic vibrator 18 is 0.8-1 MHz, and the megasonic frequencies of two adjacent megasonic vibrators 18 are different; the ultrasonic frequency of the ultrasonic vibrator 16 is 20 kHz.

[0034] Due to the high-frequency vibration, the non-Newtonian fluid (starch and water constitute a non-Newtonian fluid with shear thickening properties) in the vibration groove 12 becomes very hard, so that when the pressure plate 17 makes a sharp return motion, the ribs 171 can apply non-uniform and pulsed impact to the hardened non-Newtonian fluid. This impact accelerates the impact, collision and cutting of the abrasive in the non-Newtonian fluid on the surface of the aluminum plate, thereby completing the polishing operation. Even if the surface of the aluminum plate is an uneven plane, it can be well polished.

[0035] An aluminum plate with a surface roughness of 1.6±0.1μm (with a raised area on the surface) is ground and polished by the vehicle sign substrate polishing device of the present invention. The abrasive is silicon carbide powder with a mesh size of 220. A large number of aluminum plates can be polished at one time. The single polishing time is 15 to 20 minutes, and a vehicle sign substrate with a surface roughness of 2.83±0.2μm is obtained (the surface roughness here refers to the average value).

[0036] In the present invention, the polishing with high-frequency vibration as the system does not rely on stirring, rotation, high-speed rotation and other technologies. The necessary factors for completing the polishing in a short time are:

[0037] Factor 1: The polishing auxiliary medium must contain non-Newtonian fluid;

[0038] Factor 2: The pressure plate 17 must continuously apply non-uniform and pulsed impacts to the non-Newtonian fluid.

[0039] Example 2

[0040] In Example 1, a heat exchange chamber 111 is provided inside the bottom box 11, a cooling water inlet 14 connected to the heat exchange chamber 111 is provided at the bottom of the bottom box 11, and a cooling water outlet 112 connected to the heat exchange chamber 111 is provided at the top of the bottom box 11.

[0041] When the megasonic vibrator 18 is used for a long time and in large quantities, in order to avoid overheating, cooling water is introduced into the heat exchange cavity 111 to dissipate heat.

[0042] Example 3

[0043] In Embodiment 1, the driving mechanism 20 further includes a lifting cylinder for driving the vertical plate 21 to move up and down.

[0044] The vertical plate 21 is driven to move up and down by the lifting cylinder, so that the materials in the vibration trough 12 can be taken out and put out conveniently.

[0045] Example 4

[0046] In Embodiment 1, the vibration groove 12 is made of beryllium bronze with excellent elasticity, and the rigid plate 13 is made of gray cast iron with excellent rigidity. The vehicle sign base plate 30 and the loading groove 151 are clearance-fitted.

[0047] Example 5

[0048] The difference between this example and Example 1 is that in this example, the driving mechanism 20 is not started, the pressing plate 17 does not move, and the rest is the same.

[0049] Example 6

[0050] The difference between this example and Example 1 is that the driving mechanism 20 is not used in this example, the pressure plate 17 is replaced by a transmission belt moving at a uniform speed, the outer surface of the transmission belt is provided with ridges, and a limiting plate is used to limit the lower section of the transmission belt, and the rest are the same.

[0051] Example 7

[0052] The difference between this example and the first embodiment is that in this example, the installation positions of the ultrasonic vibrator 16 and the megasonic vibrator 18 are interchanged, and the rest are the same.

[0053] Example 8

[0054] The difference between this example and the first embodiment is that in this example, only the ultrasonic vibrator 16 is started, and the megasonic vibrator 18 is not started, and the rest are the same.

[0055] Example 9

[0056] The difference between this example and the first embodiment is that in this example, only the megasonic vibrator 18 is started, and the ultrasonic vibrator 16 is not started, and the rest are the same.

[0057] Example 10

[0058] The difference between this example and the first embodiment is that in this example, the megasonic frequencies of all megasonic vibrators 18 are the same, and the rest are the same.

[0059] Embodiment 11

[0060] The difference between this example and Example 1 is that the polishing auxiliary medium is composed of a mixture of abrasive and water in a mass ratio of 3.3:1.

[0061] The test results of Example 1 and Examples 5 to 11 are shown in Table 1:

[0062] Table 1

[0063] Polishing effect Surface roughness variance Polishing defects Example 1 Polishing 15min, Ra=2.83μm 0.009 No erosion holes found Example 5 Polishing 60min, Ra=2.02μm / / Example 6 Polishing 35min, Ra=2.77μm 0.256 No erosion holes found Example 7 Polishing 12min, Ra=2.89μm / Some erosion holes appear near the raised area Example 8 Polishing 60min, Ra=1.91μm / / Example 9 Polishing 60min, Ra=2.25μm / / Example 10 Polishing for 15 minutes, Ra cannot be measured / A large number of corrosion holes appear on the surface of the aluminum plate Embodiment 11 Polishing 60min, Ra=1.72μm / /

[0064] In Table 1, Ra refers to the average value of surface roughness. In Example 5, after polishing for 60 minutes, the surface roughness did not reach 2.8 μm. Both the efficiency and the polishing effect were not as expected, and it could not be used to polish the vehicle sign substrate.

[0065] In Example 6, if uniform impact is used, the polishing effect is not as good as that in Example 1, and in particular, it may also cause the defect of uneven polishing.

[0066] In Example 7, when measuring the surface roughness, avoid the etched hole area, which refers to a pit with a diameter ranging from 1 to 5 μm and a depth exceeding 10 μm. It can be seen from Examples 7 to 10 that high-frequency vibration should be mainly applied to the surface of the aluminum plate with megasonic vibration as a supplement; using only ultrasound, only megasonic vibration, or mainly applying ultrasonic vibration to the surface of the aluminum plate will not complete the polishing of the aluminum plate in a short time, and may even cause other defects.

[0067] Example 12

[0068] The difference between this example and Example 1 is that the polishing auxiliary medium in this example is composed of abrasive, starch and water mixed in a mass ratio of 1.3:2:1, and the rest are the same.

[0069] If graphite powder is not added to the polishing auxiliary medium, after 63 hours of cumulative polishing, a large amount of aluminum chips will accumulate, resulting in extremely uneven polishing and a surface roughness variance greater than 0.4; it is basically unusable and needs to be replaced.

[0070] In Example 1, after accumulative polishing for 120 hours, the surface roughness variance is still less than 0.3, which significantly extends the service life of the polishing auxiliary medium.

[0071] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A vehicle sign substrate polishing device, characterized in that: The polishing tank (10) comprises a polishing tank (10), wherein the polishing tank (10) comprises a bottom box (11), a vibration tank (12) is arranged on the top of the bottom box (11), a pressing plate (17) is arranged at the notch of the vibration tank (12), and an opening for the pressing plate (17) to move is arranged on the top of the vibration tank (12); a driving mechanism (20) is arranged above the polishing tank (10) for driving the pressing plate (17) to perform reciprocating translational motion along the length direction of the vibration tank (12); a polishing chamber (121) is formed between the pressing plate (17) and the vibration tank (12), and the polishing chamber (121) is filled with a polishing auxiliary medium; a plurality of polishing chambers (121) are arranged inside the vibration tank (12) for polishing a vehicle nameplate substrate (30) A loading and vibrating mechanism for loading and vibrating, the loading and vibrating mechanism comprising rigid plates (13) respectively embedded in the left and right sides of a vibration groove (12), and a lap plate (15) connected to the two rigid plates (13), one end of the rigid plate (13) being located in a polishing chamber (121), and the other end of the rigid plate (13) being located outside the vibration groove (12), an ultrasonic vibrator (16) being fixedly installed below the rigid plate (13), and the ultrasonic vibrator (16) being located outside the vibration groove (12), and a loading groove (151) for loading a vehicle nameplate substrate (30) being provided in the middle section of the lap plate (15); and a plurality of megasonic vibrators (18) being fixedly installed below the top of the bottom box (11).

2. The vehicle sign substrate polishing device according to claim 1, characterized in that: The driving mechanism (20) comprises a vertical plate (21), a servo motor, a rotating wheel (27), a sector gear (25), a guide rod (22) arranged parallel to the pressing plate (17), and a connecting plate (24) used to connect the pressing plate (17) and the guide rod (22); a sliding sleeve (23) is sleeved on the outside of the guide rod (22), and the sliding sleeve (23) is fixedly connected to the vertical plate (21); a rack portion (221) meshing with the sector gear (25) is arranged in the middle of the guide rod (22); the end of the sector gear (25) away from the tooth portion is integrally connected to a swing arm (26) ), a first shaft (251) is installed at the connection between the swing arm (26) and the fan gear (25), the first shaft (251) is rotatably connected to the vertical plate (21), the swing arm (26) is provided with a long hole (261) along its length direction, a second shaft (272) is fixedly connected at the center of the rotating wheel (27), the second shaft (272) is rotatably connected to the vertical plate (21), the second shaft (272) is driven to rotate by a servo motor, and a convex shaft (271) adapted to the long hole (261) is provided on the edge of the rotating wheel (27).

3. The vehicle sign substrate polishing device according to claim 1, characterized in that: When the vertical projections of the convex shaft (271), the second shaft (272) and the first shaft (251) are collinear, a line connecting the vertical projections of the convex shaft (271), the second shaft (272) and the first shaft (251) is arranged perpendicular to the vertical projection of the rack portion (221).

4. The vehicle sign substrate polishing device according to claim 1, characterized in that: A heat exchange chamber (111) is arranged inside the bottom box (11), a cooling water inlet (14) connected to the heat exchange chamber (111) is arranged at the bottom of the bottom box (11), and a cooling water outlet (112) connected to the heat exchange chamber (111) is arranged at the top of the bottom box (11).

5. The vehicle sign substrate polishing device according to claim 2, characterized in that: The driving mechanism (20) also includes a lifting cylinder for driving the vertical plate (21) to move up and down.

6. The vehicle sign substrate polishing device according to claim 1, characterized in that: The lower surface of the pressing plate (17) is provided with a plurality of convex ribs (171) at equal intervals along the length direction of the pressing plate (17); the convex ribs (171) are of an elliptical structure; the long axis direction of the convex ribs (171) is perpendicular to the length direction of the pressing plate (17); and the thickness of the convex ribs (171) is 1.5 to 2.5 mm.

7. The vehicle sign substrate polishing device according to claim 1, characterized in that: The polishing auxiliary medium is composed of abrasive, starch, graphite powder and water mixed in a mass ratio of 1:2:0.3:

1.

8. The vehicle sign substrate polishing device according to claim 1, characterized in that: The megasonic frequency of the megasonic vibrator (18) is 0.8-1 MHz, and the megasonic frequencies of two adjacent megasonic vibrators (18) are different; the ultrasonic frequency of the ultrasonic vibrator (16) is 20 kHz.

9. The vehicle sign substrate polishing device according to claim 1, characterized in that: The vibration trough (12) is made of beryllium bronze, and the rigid plate (13) is made of gray cast iron.

10. The vehicle sign substrate polishing device according to claim 1, characterized in that: There is a clearance fit between the vehicle sign base plate (30) and the loading slot (151).

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