A paint spraying device for differential housing

Abstract

The present application discloses a paint spraying device for a differential case, which relates to the technical field of differential case processing, and comprises a conveying device, a conveying track and a differential case, and also comprises a paint spraying assembly, wherein the paint spraying assembly is located above the conveying device; the paint spraying assembly comprises a support plate, a running device, an inner paint spraying part, an air intake part, a pressurizing part and an outer paint spraying part; the support plate is located below the conveying track, and a running device is fixed on the support plate near the conveying track, and the running device can drive the paint spraying assembly to move along the direction of the conveying track; the differential case is an elliptical cylinder with a hollow interior, an opening at one end, a large end and a small end, and a protrusion is fixed on the end of the differential case away from the opening; the protrusion is a truncated cone with a hollow interior and openings at both ends; the differential case can be conveyed while the mounting hole of the second mounting plate is blocked, and there is no need to frequently adjust the paint spraying position, so that the inner and outer surfaces of the differential case can be evenly sprayed.

Description

Technical Field

[0001] The invention relates to the technical field of differential case processing, and in particular to a paint spraying device for a differential case. Background Art

[0002] The tricycle differential is an important component of the tricycle transmission system. The differential is mainly composed of planetary gears, half-axle gears, and differential housing. In order to improve the aesthetics and durability of the differential housing, the surface of the differential housing needs to be painted during production.

[0003] When spraying the differential housing, it is usually transported to the spraying area before the painting operation is carried out, which is inefficient. In addition, there are mounting holes on the differential housing, which are easy to be sprayed into the mounting holes during painting, affecting the tightness of the subsequent differential housing installation. Since the inner and outer surfaces of the differential housing are uneven, the spraying position needs to be adjusted frequently during manual or automatic spraying. Spraying distances that are too close or too far can easily cause the paint layer to be too thick or too thin, resulting in uneven spraying on the surface of the differential housing. Summary of the invention

[0004] The embodiment of the present application provides a paint spraying device for a differential case, thereby solving the problem in the prior art that paint is sprayed into the mounting hole of the differential case and the inner and outer surfaces of the differential case are unevenly sprayed.

[0005] The embodiment of the present application provides a paint spraying device for a differential housing, comprising a conveying device, a conveying track and a differential housing, and also comprising a paint spraying assembly, wherein the paint spraying assembly is located above the conveying device;

[0006] The painting assembly includes a support plate, a running device, an inner painting section, an air intake section, a pressurizing section, and an outer painting section;

[0007] The support plate is located below the conveying track, and a walking device is fixed on the support plate near the conveying track, and the walking device can drive the paint spraying assembly to move along the direction of the conveying track;

[0008] The differential housing is an elliptical cylinder with a hollow interior, an opening at one end, a large end and a small end. A protrusion is fixed on the end of the differential housing away from the opening.

[0009] The raised portion is a truncated cone with a hollow interior and openings at both ends. A through hole is opened on the differential housing near the raised portion, and a large-diameter opening at one end of the raised portion coincides with the through hole on the differential housing.

[0010] A mounting seat is fixed on the free end of the protruding portion, the mounting seat is composed of a large circular ring and a small circular ring, the small diameter opening of the free end of the protruding portion coincides with the small circular ring, the large circular ring and the small circular ring are fixed by a plurality of evenly spaced mounting plates 2, each of which has a mounting hole;

[0011] The differential housing is located between the inner painted portion and the outer painted portion;

[0012] The inner painting portion is at an equal distance from the inner surface of the differential housing and the inner surface of the raised portion;

[0013] The outer painting portion is at an equal distance from the outer surface of the differential housing and the outer surface of the raised portion;

[0014] The pressurizing part is used to pressurize the inner painting part and the outer painting part so that the inner painting part and the outer painting part spray paint the inner and outer surfaces of the differential housing;

[0015] The external painting part comprises a clamping part, and the air inlet part is used to supply air into the clamping part, so as to facilitate the clamping part to position and clamp the second mounting plate.

[0016] Further, the inner painting section includes an inner painting box and a spraying section 1;

[0017] The inner spray paint box is an elliptical cylinder with a hollow interior and a large end and a small end. The inner spray paint box is filled with paint liquid and is fixed on the side panel.

[0018] The inner paint spray box is parallel to the differential housing, and a convex block is fixed on one end of the inner paint spray box close to the inner surface of the raised portion;

[0019] The protrusion is a truncated cone with a hollow interior and an opening at one end close to the inner spray paint box. The protrusion is connected to the interior of the inner spray paint box, and the side surface of the protrusion is parallel to the inner surface of the raised portion;

[0020] The spraying part 1 includes a flat spray head 1, a curved spray head 1 and a concave spray head 1;

[0021] The flat spray head 1 is fixed on one end of the inner spray paint box close to the inner surface of the differential housing, and the flat spray head 1 is used to spray the inner surface of the differential housing;

[0022] The arc surface spray head 1 is fixed on the side of the convex block, and the concave surface spray head 1 is fixed on the free end of the convex block. The arc surface spray head 1 and the concave surface spray head 1 are both used for spraying the inner surface of the convex part;

[0023] The support plate is a rectangular plate, and a side plate 1 and a side plate 2 are fixed on both sides of the long side thereof, and the inner spray paint box is fixed on a side of the side plate 1 close to the differential housing;

[0024] The distance between the free end of the inner spray paint box and the inner surface of the differential housing is equal to the distance between the convex block and the inner surface of the raised portion.

[0025] Furthermore, the external spray paint unit also includes an external spray paint box and a second spray paint unit;

[0026] The outer spray paint box is an elliptical cylinder with a hollow interior and a large end and a small end, and a truncated cone-shaped groove is opened at one end close to the inner spray paint box, and the groove is parallel to the protrusion;

[0027] The outer spray paint box is fixed on the side of the second side plate close to the differential housing, the outer spray paint box is filled with paint liquid, and the outer spray paint box is parallel to the inner spray paint box;

[0028] The boosting part includes a boosting pipe 1, which has two output ends, one output end of the boosting pipe 1 extends into the inner spray paint box, and the other output end of the boosting pipe 1 extends into the outer spray paint box;

[0029] The second spraying part includes a second flat spray head and a second curved spray head;

[0030] The second flat spray head is fixed on one end of the external spray paint box close to the differential housing, and the second flat spray head is used for spraying the outer surface of the differential housing;

[0031] The arc surface spray head 2 is fixed on the groove, and the arc surface spray head 2 is used for spraying the outer surface of the raised part.

[0032] Furthermore, the groove includes a curved surface and a bottom surface, and a circular groove is formed on the bottom surface of the groove;

[0033] The clamping part includes a vent pipe 1, which is a hollow annular body and is fixed in the annular groove of the groove;

[0034] A plurality of connecting pipes are evenly spaced and fixed on one end of the vent pipe close to the differential housing, and a telescopic bag is fixed on the free end of each connecting pipe;

[0035] A clamping rod is fixed to the free end of each telescopic bag, the clamping rod is a cylinder with a hollow interior and an opening at one end close to the vent pipe, one clamping rod is located outside a connecting pipe, and one clamping rod is parallel to a mounting hole of a mounting plate 2;

[0036] The air inlet part includes an air delivery pipe, which is fixed on the second side plate, an air guide pipe 1 is fixed on the air outlet end of the air delivery pipe, and the air inlet end of the air delivery pipe is connected to the air pump;

[0037] The air outlet end of the air guide pipe 1 extends into the ventilation pipe 1. After air enters the air supply pipe, air is supplied into the ventilation pipe 1 through the air guide pipe 1, so that the telescopic bag drives the clamping rod to extend into the mounting hole of the mounting plate 2.

[0038] Furthermore, a plurality of the clamping rods are externally fixed with an annular electromagnet;

[0039] The diameter of the electromagnet is equal to the diameter of the large circular ring of the mounting seat. After the clamping rod is inserted into the mounting hole of the second mounting plate, the electromagnet is energized to be magnetically adsorbed to the mounting seat.

[0040] Furthermore, the second spraying part further comprises a plurality of nozzles, and the plurality of nozzles are evenly spaced and fixed on the bottom surface of the groove;

[0041] There are gaps between adjacent mounting plates 2, and the nozzle is used for spraying the gap spaces between the plurality of mounting plates 2.

[0042] Furthermore, a plurality of mounting plates 1 are evenly spaced and fixed to the side of the differential housing, and a mounting hole is formed in each mounting plate 1;

[0043] The external spray paint part also includes a blocking part, which blocks the mounting hole of the mounting plate 1, and a mounting groove is opened on the end surface of the external spray paint box close to the differential housing;

[0044] The blocking portion includes a second vent pipe, which is an elliptical ring body with a hollow interior and is fixed in a mounting groove of the outer spray paint box;

[0045] The air guide pipe 1 has two air outlet ends, a branch pipe is fixed on one of the air outlet ends of the air guide pipe 1, the air outlet end of the branch pipe extends into the ventilation pipe 2, a valve is fixed on the air guide pipe 1 near the ventilation pipe, and a valve is fixed on the branch pipe away from the ventilation pipe;

[0046] A plurality of long soft bags are evenly spaced and fixed on the free end of the second ventilation pipe, and one long soft bag is parallel to a mounting hole on the first mounting plate;

[0047] A material storage bag is fixed to the free end of each of the long soft bags, and the material storage bag is filled with gravity powder.

[0048] Furthermore, the inner spray paint section further comprises a material storage box 1, which is fixed in the inner spray paint box, the inner spray paint box is filled with primer, and the material storage box 1 is filled with topcoat;

[0049] The first storage box is fixed with a second paint spraying part, which is used to spray topcoat on the inner surface of the differential housing and the inner surface of the raised part;

[0050] The external paint spraying unit further comprises a second material storage box, which is fixed in the external paint spraying box, the external paint spraying box is filled with primer, and the second material storage box is filled with topcoat;

[0051] The second storage box is fixed with a paint spraying unit 1, which is used to spray topcoat the outer surface of the differential housing and the outer surface of the raised portion;

[0052] The boosting part also includes a boosting tube 2, which has two output ends. One output end of the boosting tube 2 extends into the first storage box, and the other output end of the boosting tube 2 extends into the second storage box.

[0053] Furthermore, the spraying distances of the spraying part 1 and the spraying part 2 are equal, and the spraying distances of the spraying part 2 and the spraying part 1 are equal;

[0054] The paint spraying pressure of the boost pipe 1 is in the range of 0.1MPa to 0.2MPa, and the paint spraying pressure of the boost pipe 2 is in the range of 0.3MPa to 0.4MPa.

[0055] Furthermore, the paint spraying assembly also includes a sealing portion;

[0056] The sealed part includes two gas soft bags and a hot air pipe;

[0057] The gas soft bag is a bag body in the shape of a rectangular frame, one gas soft bag is fixed on the side plate 1, and one gas soft bag is fixed on the side plate 2, the inner spray paint part is located in the middle of one gas soft bag, and the outer spray paint part is located in one gas soft bag;

[0058] A sealing plate is fixed to the free end of each gas soft bag, the air supply pipe has two outlet ends, one outlet end of the air supply pipe is fixed to the second air guide pipe, the second air guide pipe has two outlet ends, and one outlet end of the second air guide pipe extends into a gas soft bag;

[0059] The sealing plate is a rectangular frame with a hollow interior, and an air outlet is opened on the inner wall close to the differential housing, and the two sealing plates are parallel;

[0060] The air inlet end of the hot air pipe is connected to the hot air source device, the hot air pipe has two air outlet ends, and one of the air outlet ends of the hot air pipe extends into a sealing plate.

[0061] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0062] By setting up the painting assembly, the second mounting plate is positioned and clamped by the clamping part, and then the inner and outer surfaces of the differential housing and the protrusion are sprayed by the inner and outer painting parts, so that the mounting hole of the second mounting plate can be sealed while the differential housing is transported, and there is no need to frequently adjust the painting position, so that the inner and outer surfaces of the differential housing can be evenly sprayed. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 It is a schematic diagram of the three-dimensional structure of the paint spraying device for the differential housing of the present invention;

[0064] Figure 2 It is a structural schematic diagram of the positional relationship between the differential case and the inner painting part of the painting device for the differential case of the present invention;

[0065] Figure 3 It is a schematic structural diagram of the positional relationship between the differential housing and the outer painting part of the painting device for the differential housing of the present invention;

[0066] Figure 4It is a structural schematic diagram of the connection relationship between the air supply pipe and the side plate of the paint spraying device for the differential housing of the present invention;

[0067] Figure 5 It is a schematic diagram of the three-dimensional structure of the inner and outer surfaces of the differential case of the differential case spraying device of the present invention;

[0068] Figure 6 It is a schematic diagram of the three-dimensional structure of the inner paint spray box of the paint spray device for the differential housing of the present invention;

[0069] Figure 7 It is a schematic diagram of the three-dimensional structure of the outer paint spray box of the paint spray device for the differential housing of the present invention;

[0070] Figure 8 It is a schematic exploded three-dimensional structure diagram of the outer paint spray box and the clamping part of the paint spray device for the differential housing of the present invention;

[0071] Fig. 9 It is a structural schematic diagram of the positional relationship between the vent pipe 1 and the vent pipe 2 of the paint spraying device for the differential housing of the present invention;

[0072] Fig.10 It is a three-dimensional structural schematic diagram of the connection relationship between the connecting pipe and the electromagnet of the paint spraying device for the differential housing of the present invention;

[0073] Fig.11 It is a bottom view structural schematic diagram of the differential case of the differential case spraying device of the present invention, in which the differential case is located between the inner spraying part and the outer spraying part;

[0074] Fig.12 The invention provides a paint spraying device for a differential housing. Fig.11 A schematic diagram of the partially enlarged structure at center A;

[0075] Fig.13 It is a schematic diagram of a state in which a long soft bag of the paint spraying device for a differential housing of the present invention extends into a mounting hole;

[0076] Fig.14 It is an exploded three-dimensional structural schematic diagram of the outer paint spray box and the second material storage box of the paint spray device for the differential housing of the present invention;

[0077] Fig.15 It is a structural schematic diagram of the connection relationship between the material storage box 2 and the external material spraying pipe 1, the external material spraying pipe 2 and the external material spraying pipe 3 of the paint spraying device for the differential housing of the present invention;

[0078] Fig.16 It is a structural schematic diagram of the positional relationship between the flat spray head 2 and the external spray pipe 1 of the paint spraying device for the differential housing of the present invention;

[0079] Fig.17It is a schematic exploded three-dimensional structure diagram of an inner paint spray box and a material storage box of a paint spray device for a differential housing of the present invention;

[0080] Fig.18 It is a structural schematic diagram of the positional relationship between the boost pipe 2 and the sealing part of the paint spraying device for the differential housing of the present invention;

[0081] Fig.19 It is a structural schematic diagram of the positional relationship between the air guide pipe 2 and the sealing part of the paint spraying device for the differential housing of the present invention;

[0082] Fig. 20 It is a structural schematic diagram of the positional relationship between the inner and outer painting parts of the painting device for a differential case of the present invention and the gas soft bag;

[0083] Fig.21 It is a schematic diagram of a state in which the sealing plates of the paint spraying device for a differential housing of the present invention are in conflict with each other after the gas soft bag is expanded;

[0084] Fig. 22 It is a structural schematic diagram of the connection relationship between the hot air pipe and the sealing plate of the paint spraying device for the differential housing of the present invention;

[0085] Fig.23 It is a schematic diagram of the disassembled three-dimensional structure of two sealing plates of the paint spraying device for the differential housing of the present invention.

[0086] In the figure: 100, conveying device; 110, positioning seat; 120, conveying track; 130, collection box;

[0087] 200, spray painting assembly; 210, support plate; 211, side plate 1; 212, side plate 2; 220, walking device;

[0088] 230, internal spray paint unit; 2301, internal spray paint box; 231, spray paint unit 1; 2311, flat spray head 1; 2312, curved spray head 1; 2313, concave spray head; 232, convex block;

[0089] 233, material storage box one; 2331, paint spraying section two; 2332, internal spraying pipe one; 2333, internal spraying pipe two; 2334, internal spraying pipe three;

[0090] 240, air intake unit; 241, air delivery pipe; 242, air guide pipe 1; 2421, branch pipe; 243, air guide pipe 2; 250, booster unit; 251, booster pipe 1; 252, booster pipe 2;

[0091] 260, external spray paint unit; 2601, external spray paint box; 261, spray paint unit 2; 2611, flat spray head 2; 2612, curved spray head 2; 2613, nozzle; 262, groove;

[0092] 263, clamping part; 2631, ventilation pipe 1; 2632, connecting pipe; 2633, clamping rod; 2634, electromagnet; 2635, telescopic bag;

[0093] 264, blocking part; 2641, ventilation pipe 2; 2642, long soft bag; 2643, storage bag;

[0094] 265, material storage box 2; 2651, paint spraying section 1; 2652, external spraying pipe 1; 2653, external spraying pipe 2; 2654, external spraying pipe 3;

[0095] 270, sealed part; 271, gas soft bag; 272, sealing plate; 2721, air outlet; 273, hot air pipe;

[0096] 300, differential housing; 310, mounting plate 1; 320, raised portion; 321, mounting plate 2; 322, mounting seat. DETAILED DESCRIPTION

[0097] To facilitate the understanding of the present invention, the present application will be described more comprehensively below with reference to the relevant drawings; the drawings show preferred embodiments of the present invention, but the present invention can be implemented in many different forms and is not limited to the embodiments described herein; on the contrary, the purpose of providing these embodiments is to enable a more thorough and comprehensive understanding of the disclosed content of the present invention.

[0098] It should be noted that the terms “vertical”, “horizontal”, “up”, “down”, “left”, “right” and similar expressions used in this document are only for illustrative purposes and do not represent the only implementation method.

[0099] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs; the terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the term "and / or" used herein includes any and all combinations of one or more related listed items.

[0100] like Figures 1 to 13 As shown, the present application proposes a differential housing paint spraying device, comprising a conveying device 100, a conveying track 120 and a differential housing 300. The conveying device 100 is a belt conveyor, and the conveying device 100 is used to convey the differential housing 300. A positioning seat 110 is fixed on the conveying device 100, and the positioning seat 110 is used to position the differential housing 300. The paint spraying assembly 200 can not only clamp and convey the differential housing 300, but also complete the spraying of the inner and outer surfaces of the differential housing 300 during the conveying process. The paint spraying assembly 200 is located above the conveying device 100;

[0101] The painting assembly 200 includes a support plate 210, a walking device 220, an inner painting section 230, an air intake section 240, a pressurizing section 250 and an outer painting section 260;

[0102] The support plate 210 is located below the conveying track 120, and a walking device 220 is fixed on the support plate 210 near the conveying track 120. The walking device 220 is located in the conveying track 120, and the walking device 220 can drive the paint spraying assembly 200 to move along the direction of the conveying track 120;

[0103] The differential housing 300 is an elliptical cylinder with a hollow interior, an opening at one end, a large end and a small end. A protrusion 320 is fixed to the end of the differential housing 300 away from the opening.

[0104] The protrusion 320 is a truncated cone with a hollow interior and openings at both ends. A through hole is opened on the differential housing 300 near the protrusion 320. The large diameter opening at one end of the protrusion 320 coincides with the through hole on the differential housing 300. That is, the protrusion 320 is connected to the interior of the differential housing 300. The outer surface of the protrusion 320 is a convex surface, and the inner surface is a concave surface.

[0105] A mounting seat 322 is fixed on the free end of the protruding portion 320. The mounting seat 322 is composed of a large circular ring and a small circular ring. The small diameter opening of the free end of the protruding portion 320 coincides with the small circular ring. The large circular ring and the small circular ring are fixed by a plurality of evenly spaced mounting plates 321. Each mounting plate 321 has a mounting hole.

[0106] The internal space of the differential housing 300 is used to install the transmission assembly of the differential. The differential is connected to the motor through a transmission shaft. The free end of the mounting seat 322 is a mounting surface. The transmission shaft passes through the small ring and extends into the differential housing 300 to be connected to the transmission assembly of the differential.

[0107] The differential housing 300 is located between the inner painted portion 230 and the outer painted portion 260;

[0108] The inner spray paint part 230 has an equal spray paint distance from the inner surface of the differential case 300 and the inner surface of the raised part 320, that is, the inner spray paint part 230 can spray the inner surface of the differential case 300 and the inner surface of the raised part 320 uniformly at the same time;

[0109] The outer spray paint part 260 has an equal spray paint distance from the outer surface of the differential housing 300 and the outer surface of the raised part 320, that is, the outer spray paint part 260 can spray the outer surface of the differential housing 300 and the outer surface of the raised part 320 uniformly at the same time;

[0110] The pressurizing part 250 is used to pressurize the inner painting part 230 and the outer painting part 260 so that the inner painting part 230 and the outer painting part 260 spray the inner and outer surfaces of the differential housing 300;

[0111] The outer painting part 260 includes a clamping part 263 , and the air inlet part 240 is used to supply air into the clamping part 263 , so as to facilitate the clamping part 263 to position and clamp the second mounting plate 321 , and to seal the mounting hole of the second mounting plate 321 .

[0112] It should be noted that the differential housing 300 is vertically positioned on the positioning seat 110. When the differential housing 300 is located between the inner paint part 230 and the outer paint part 260, the second mounting plate 321 is parallel to the clamping part 263. The positioning seat 110 does not affect the clamping of the differential housing 300 by the paint assembly 200. At the same time, the positioning seat 110 can provide support force for the differential housing 300, so that when the clamping part 263 clamps the differential housing 300, the differential housing 300 is not easy to tip over.

[0113] Specifically, if Figures 2 to 6 As shown, the inner painting unit 230 includes an inner painting box 2301 and a painting unit 231;

[0114] The inner spray paint box 2301 is an elliptical cylinder with a hollow interior and a large end and a small end. The inner spray paint box 2301 is filled with paint liquid and is fixed on the side plate 1 211.

[0115] The inner spray paint box 2301 is parallel to the differential housing 300, and a protrusion 232 is fixed to one end of the inner spray paint box 2301 close to the inner surface of the protrusion 320;

[0116] The protrusion 232 is a truncated cone with a hollow interior and an opening at one end close to the inner spray paint box 2301. The protrusion 232 is connected to the interior of the inner spray paint box 2301, and the side surface of the protrusion 232 is parallel to the inner surface of the raised portion 320.

[0117] The spraying part 231 includes a flat spray head 2311, a curved spray head 2312 and a concave spray head 2313;

[0118] The plane spray head 2311 is fixed on one end of the inner spray box 2301 close to the inner surface of the differential housing 300. The plane spray head 2311 is used to spray the inner surface of the differential housing 300. There are multiple plane spray heads 2311, and the spray range of the multiple plane spray heads 2311 can cover the inner surface of the differential housing 300.

[0119] The arc surface spray head 2312 is fixed on the side of the protrusion 232, and there are multiple arc surface spray heads 2312. The concave surface spray head 2313 is fixed on the free end of the protrusion 232, and there are multiple concave surface spray heads 2313. The arc surface spray head 2312 and the concave surface spray head 2313 are both used for spraying the inner surface of the protrusion 320. The spraying range of the multiple arc surface spray heads 2312 and the multiple concave surface spray heads 2313 can cover the inner surface of the protrusion 320.

[0120] The support plate 210 is a rectangular plate, and a side plate 1 211 and a side plate 212 are fixed to the two sides of the long side thereof, and the inner spray paint box 2301 is fixed to the side of the side plate 1 211 close to the differential housing 300;

[0121] The distance between the free end of the inner spray paint box 2301 and the inner surface of the differential housing 300 is equal to the distance between the protrusion 232 and the inner surface of the raised portion 320 .

[0122] It should be noted that the volume of the inner spray paint box 2301 is not less than the volume of the differential housing 300, the volume of the protrusion 232 is not greater than the volume of the raised portion 320, and the inner spray paint box 2301, the protrusion 232 are adapted to the shapes of the differential housing 300 and the raised portion 320. In this way, the inner surface of the differential housing 300 and the inner surface of the raised portion 320 can be fully sprayed by the spraying part 231 while avoiding excessive waste of paint.

[0123] Specifically, if Figures 2 to 8 As shown, the external painting unit 260 further includes an external painting box 2601 and a second painting unit 261;

[0124] The outer spray paint box 2601 is an elliptical cylinder with a hollow interior and a large end and a small end, and a truncated cone-shaped groove 262 is formed at one end close to the inner spray paint box 2301, and the groove 262 is parallel to the protrusion 232;

[0125] The outer paint spray box 2601 is fixed on the side of the second side plate 212 close to the differential housing 300. The outer paint spray box 2601 is filled with paint liquid. The outer paint spray box 2601 is parallel to the inner paint spray box 2301, that is, the outer paint spray box 2601 is parallel to the differential housing 300.

[0126] The boosting part 250 includes a boosting pipe 1 251, and the boosting pipe 1 251 has two output ends. One output end of the boosting pipe 1 251 extends into the inner paint spray box 2301, and the other output end of the boosting pipe 1 251 extends into the outer paint spray box 2601. The remaining end of the boosting pipe 1 251 is connected to a boosting pump. The boosting pump of the boosting pipe 1 251 is fixed on the support plate 210. The paint liquid is pressurized by the boosting pipe 1 251, so that the paint liquid is sprayed from the spraying part 1 231 and the spraying part 2 261 to spray the differential housing 300 with fine paint mist.

[0127] The second spraying part 261 includes a second flat spray head 2611 and a second curved spray head 2612;

[0128] The second plane spray head 2611 is fixed on one end of the outer spray paint box 2601 close to the differential housing 300. The second plane spray head 2611 is used to spray the outer surface of the differential housing 300. There are multiple second plane spray heads 2611, and the spray range of the multiple second plane spray heads 2611 can cover the outer surface of the differential housing 300.

[0129] The second arc surface spray head 2612 is fixed on the groove 262 . The second arc surface spray head 2612 is used to spray the outer surface of the raised portion 320 . There are multiple second arc surface spray heads 2612 , and the spray range of the multiple second arc surface spray heads 2612 can cover the outer surface of the raised portion 320 .

[0130] It should be noted that the volume of the external paint box 2601 is not less than the volume of the differential housing 300 , and the volume of the groove 262 is not less than the volume of the protrusion 320 .

[0131] Specifically, if Figures 7 to 10 As shown, the groove 262 includes a curved surface and a bottom surface, and a circular groove is formed on the bottom surface of the groove 262;

[0132] The clamping portion 263 includes a vent pipe 2631, which is a hollow annular body and is fixed in the annular groove of the groove 262;

[0133] A plurality of connecting pipes 2632 are evenly spaced and fixed at one end of the vent pipe 1 2631 close to the differential housing 300. The plurality of connecting pipes 2632 are distributed in a ring shape on the vent pipe 1 2631. A telescopic bag 2635 is fixed to the free end of each connecting pipe 2632.

[0134] A clamping rod 2633 is fixed to the free end of each telescopic bag 2635. The clamping rod 2633 is a cylinder with a hollow interior and an opening at one end close to the ventilation pipe 1 2631. One clamping rod 2633 is located outside one connecting pipe 2632. One clamping rod 2633 is parallel to the mounting hole of one mounting plate 2 321. Both the clamping rod 2633 and the connecting pipe 2632 are made of metal and have a good supporting effect.

[0135] The air inlet 240 includes an air supply pipe 241, which is fixed to the second side plate 212, and an air guide pipe 1 242 is fixed to the air outlet end of the air supply pipe 241, and the air inlet end of the air supply pipe 241 is connected to the air pump;

[0136] The air outlet end of the air guide pipe 242 extends into the ventilation pipe 2631, and the connection between the air guide pipe 242 and the ventilation pipe 2631 is sealed and fixed. After the air enters the air supply pipe 241, the air is supplied to the ventilation pipe 2631 through the air guide pipe 242, so that the telescopic bag 2635 drives the clamping rod 2633 to extend into the mounting hole of the mounting plate 321. The length of each clamping rod 2633 is not greater than the length of the connecting pipe 2632. After the clamping rod 2633 extends into the mounting hole of the mounting plate 321, the open end of the clamping rod 2633 still contacts the connecting pipe 2632, ensuring the stability of the clamping of the differential housing 300.

[0137] It is worth noting that the diameter of the clamping rod 2633 is not greater than the diameter of the mounting hole of the second mounting plate 321. The clamping rod 2633 can be inserted into the mounting hole of the second mounting plate 321, which is convenient for clamping and fixing the differential housing 300. At the same time, the mounting hole of the second mounting plate 321 can be blocked to prevent paint from being sprayed into the mounting hole of the second mounting plate 321.

[0138] Specifically, if Figures 10 to 13 As shown, a circular electromagnet 2634 is fixed outside the plurality of clamping rods 2633;

[0139] The diameter of the electromagnet 2634 is equal to the diameter of the large circular ring of the mounting seat 322 . After the clamping rod 2633 extends into the mounting hole of the second mounting plate 321 , the electromagnet 2634 is energized to be magnetically adsorbed to the mounting seat 322 .

[0140] It is worth noting that the differential housing 300 is made of metal. When the electromagnet 2634 is energized, it generates magnetism and can magnetically attract the differential housing 300, so that the electromagnet 2634 and the mounting seat 322 are magnetically fixed to ensure the stability of the clamping of the differential housing 300.

[0141] Specifically, if Figures 2 to 7 As shown, the second spraying part 261 further includes a plurality of nozzles 2613, each nozzle 2613 is connected to the interior of the outer spray paint box 2601, and the plurality of nozzles 2613 are evenly spaced and fixed on the bottom surface of the groove 262;

[0142] There are gaps between adjacent mounting plates 321 , and the nozzle 2613 is used to spray the gap spaces between the plurality of mounting plates 321 , that is, the plurality of nozzles 2613 can spray the gap areas between the mounting plates 321 , thereby achieving comprehensive spraying of the surface of the differential housing 300 .

[0143] In the above embodiment, when the differential housing 300 is transported to between the inner painting part 230 and the outer painting part 260 by the conveying device 100, the conveying device 100 stops conveying, and air is introduced into the ventilation pipe 1 2631 through the air supply pipe 241 to expand the telescopic bag 2635. The expanded telescopic bag 2635 can drive the clamping rod 2633 to extend into the mounting hole of the second mounting plate 321 and block the mounting hole of the second mounting plate 321. At the same time, the electromagnet 2634 is energized to be magnetically attracted to the mounting seat 322 to firmly clamp the differential housing 300. Then, the moving device 220 moves to separate the differential housing 300 from the positioning seat 110, thereby driving the differential housing 300 to move on the conveying track 120.

[0144] During the movement, the inner paint box 2301 and the outer paint box 2601 are pressurized through the boost pipe 1 251, so that the paint liquid in the inner paint box 2301 is sprayed from the spray part 1 231 to spray the inner surface of the differential case 300 and the inner surface of the protrusion 320, and the paint liquid in the outer paint box 2601 is sprayed from the spray part 261 to spray the outer surface of the differential case 300, the outer surface of the protrusion 320 and the gap area between the adjacent mounting plate 2 321. The differential case 300 can be clamped and conveyed while the mounting holes of the mounting plate 2 321 are blocked to avoid splashing into the mounting holes of the mounting plate 2 321 during paint spraying, and uniform spraying of the inner and outer surfaces of the differential case 300 can be achieved.

[0145] In some embodiments of the present application, Figures 2 to 8 As shown, a plurality of mounting plates 310 are evenly spaced and fixed on the side of the differential housing 300, and each mounting plate 310 has a mounting hole. The differential housing 300 is usually two split housings, and the differential transmission assembly is fixed in the mounting space in the two housings. The mounting holes on the mounting plate 310 are used to connect to another housing, and the mounting holes on the mounting plate 310 also need to be blocked during painting;

[0146] The outer spray paint part 260 further includes a blocking part 264, which blocks the mounting hole of the mounting plate 310, and a mounting groove is formed on the end surface of the outer spray paint box 2601 close to the differential housing 300;

[0147] The blocking portion 264 includes a second vent pipe 2641, which is an elliptical ring with a hollow interior and is fixed in a mounting groove of the outer spray paint box 2601;

[0148] The air guide pipe 1 242 has two air outlet ends, a branch pipe 2421 is fixed on one of the air outlet ends of the air guide pipe 1 242, one of the air outlet ends of the air guide pipe 1 242 extends into the ventilation pipe 1 2631, and the air outlet end of the branch pipe 2421 extends into the ventilation pipe 2 2641, a valve is fixed on the air guide pipe 1 242 near the ventilation pipe 1 2631, the connection between the branch pipe 2421 and the ventilation pipe 2 2641 is airtightly fixed, and a valve is fixed on the branch pipe 2421 away from the ventilation pipe 1 2631, that is, when the valve of the ventilation pipe 1 2631 is closed, it does not affect the gas entering the air guide pipe 1 242, and when the valve of the air guide pipe 1 242 is closed, it also does not affect the gas entering the ventilation pipe 1 2631;

[0149] A plurality of long soft bags 2642 are evenly spaced and fixed on the free end of the second vent pipe 2641. The long soft bags 2642 are rubber bags with high hardness, which can play an auxiliary supporting role. One long soft bag 2642 is parallel to a mounting hole on the first mounting plate 310.

[0150] A storage bag 2643 is fixed to the free end of each of the long soft bags 2642, and the storage bag 2643 is filled with gravity powder. The storage bag 2643 can pass through the mounting hole of the mounting plate 310 to seal both ends of the mounting hole of the mounting plate 310. The gravity powder increases the contact strength between the storage bag 2643 and the mounting plate 310 to ensure the stability of the sealing.

[0151] It is worth noting that when the air guide tube 242 delivers air to the clamping portion 263, the valve of the air guide tube 242 is in an open state, the valve of the branch tube 2421 is in a closed state, and the valve on the branch tube 2421 is in a closed state.

[0152] On the basis of the above embodiment, the differential housing 300 is clamped by the clamping part 263 and separated from the positioning seat 110. At this time, the mounting plate 1 310 and the long soft bag 2642 are parallel, the valve of the air guide pipe 1 242 is closed, the clamping part 263 keeps the clamping action unchanged, and then the valve on the branch pipe 2421 is opened, and the gas enters the ventilation pipe 2 2641 from the branch pipe 2421. As the gas enters, the long soft bag 2642 expands, and the expanded long soft bag 264 2 can drive the material storage bag 2643 to extend into the mounting hole of the mounting plate 310, and the material storage bag 2643 passes through the mounting hole of the mounting plate 310 to block the two ends of the mounting plate 310, and then the valve on the branch pipe 2421 is closed, and then the inner spray painting part 230 and the outer spray painting part 260 are used to spray paint, which can achieve the blocking of the mounting hole on the mounting plate 310, and at the same time has an auxiliary support function, which can prevent splashing into the mounting hole of the mounting plate 310 during spraying.

[0153] In some embodiments of the present application, Figures 14 to 17As shown, the inner spray paint part 230 also includes a material storage box 233, which is fixed in the inner spray paint box 2301, and the material storage box 233 is away from the spraying part 231 of the inner spray paint box 2301, and does not affect the flow of the paint liquid in the inner spray paint box 2301. The inner spray paint box 2301 is filled with primer, and the material storage box 233 is filled with topcoat;

[0154] The first storage box 233 is fixed with a second paint spraying part 2331, and the second paint spraying part 2331 is used to spray topcoat on the inner surface of the differential housing 300 and the inner surface of the raised part 320;

[0155] Among them, the paint spraying part 2331 is composed of an inner spraying pipe 1 2332, an inner spraying pipe 2333 and an inner spraying pipe 3 2334. The discharge ends of the inner spraying pipe 1 2332, the inner spraying pipe 2 2333 and the inner spraying pipe 3 2334 all extend out of the inner spraying box 2301. The inner spraying pipe 1 2332 and the inner spraying pipe 2 2333 are both used for spraying topcoat on the inner surface of the raised portion 320. The inner spraying pipe 3 2334 is used for spraying topcoat on the inner surface of the differential housing 300. The connection between the paint spraying part 2331 and the inner spraying box 2301 is sealed and fixed to prevent leakage.

[0156] The outer spray paint section 260 further includes a second storage box 265, which is fixed in the outer spray paint box 2601, and the second storage box 265 is away from the second spraying part 261 of the outer spray paint box 2601, and does not affect the flow of the paint liquid in the outer spray paint box 2601. The outer spray paint box 2601 is filled with primer, and the second storage box 265 is filled with topcoat;

[0157] The second storage box 265 is fixed with a paint spraying part 2651, and the paint spraying part 2651 is used to spray the outer surface of the differential housing 300 and the outer surface of the raised part 320 with topcoat;

[0158] Among them, the paint spraying part 2651 is composed of an external spraying pipe 1 2652, an external spraying pipe 2 2653 and an external spraying pipe 3 2654, and the discharge ends of the external spraying pipe 1 2652, the external spraying pipe 2 2653 and the external spraying pipe 3 2654 all extend out of the external paint spraying box 2601, the external spraying pipe 1 2652 and the external spraying pipe 2 2653 are both used for spraying topcoat on the outer surface of the protrusion 320, and the external spraying pipe 3 2654 is used for spraying topcoat on the outer surface of the differential housing 300, and the connection between the paint spraying part 1 2651 and the external paint spraying box 2601 is sealed and fixed.

[0159] The boosting part 250 also includes a boosting pipe 252, which has two output ends. One output end of the boosting pipe 252 extends into the material storage box 1 233, and one output end of the boosting pipe 252 extends into the material storage box 265. The remaining end of the boosting pipe 252 is connected to a boosting pump. The boosting pump of the boosting pipe 252 is fixed on the support plate 210. The boosting pump boosts the topcoat of the material storage box 1 233 and the material storage box 265 through the boosting pipe 252, so that the topcoat is sprayed from the paint spraying part 1 2651 and the paint spraying part 2 2331 with fine paint mist to spray the topcoat on the differential housing 300.

[0160] It is worth noting that after the differential housing 300 is sprayed with primer by the spraying unit 1 231 and the spraying unit 2 261, the topcoat is sprayed by the spraying unit 1 2651 and the spraying unit 2 2331, and two layers of painting can be completed in the mobile process and at the same work station.

[0161] Specifically, if Figures 14 to 17 As shown, the spraying distances of the first spraying part 2651 and the second spraying part 261 are equal, and the spraying distances of the second spraying part 2331 and the first spraying part 231 are equal, that is, the spraying distances of the primer and the topcoat on the inner and outer surfaces of the differential housing 300 and the raised part 320 are equal, and the spraying is uniform;

[0162] The paint spraying pressure of the boost pipe 251 is in the range of 0.1MPa to 0.2MPa, then the thickness of the sprayed primer is in the range of 50μm to 60μm, the paint spraying pressure of the boost pipe 252 is in the range of 0.3MPa to 0.4MPa, then the thickness of the sprayed topcoat is in the range of 70μm to 80μm.

[0163] In the above embodiment, after the differential housing 300 is sprayed with primer by the spraying unit 1 231 and the spraying unit 261, the pressure in the storage box 1 233 and the storage box 2 265 is increased by the boost pipe 252, so that the spray painting unit 1 2651 sprays the topcoat on the outer surface of the differential housing 300 and the outer surface of the raised portion 320, and the spray painting unit 2 2331 sprays the topcoat on the inner surface of the differential housing 300 and the inner surface of the raised portion 320, so that two layers of paint treatment on the inner and outer surfaces of the differential housing 300 can be completed at the same workstation during the movement, and the paint spraying is uniform and comprehensive.

[0164] In some embodiments of the present application, Figures 18 to 23 As shown, the paint spraying assembly 200 further includes a sealing portion 270;

[0165] The sealing part 270 includes two gas soft bags 271 and a hot air pipe 273;

[0166] The gas soft capsule 271 is a capsule in the shape of a rectangular frame. One gas soft capsule 271 is fixed on the side plate 1 211, and one gas soft capsule 271 is fixed on the side plate 212. The inner spray paint part 230 is located in one gas soft capsule 271, and the outer spray paint part 260 is located in one gas soft capsule 271.

[0167] It should be noted that the second air guide tube 243 and the second pressure tube 252 are not on the path of the gas soft bag 271 expansion and contraction, that is, the second air guide tube 243 and the second pressure tube 252 will not affect the expansion and contraction of the gas soft bag 271;

[0168] A sealing plate 272 is fixed to the spare end of each of the gas soft bags 271, and the air supply pipe 241 has two air outlet ends, and an air guide tube 2 243 is fixed to one of the air outlet ends of the air supply pipe 241, and one of the air outlet ends of the air supply pipe 241 is connected to the air guide tube 1 242, and a valve is fixed to the air guide tube 2 243. After the valves of the air guide tube 1 242 and the branch pipe 2421 are opened and closed, the valve of the air guide tube 2 243 is opened, thereby reducing the driving source and saving the use cost. The air guide tube 2 243 has two air outlet ends, and one of the air outlet ends of the air guide tube 243 extends into a gas soft bag 271, and the connection between the air guide tube 2 243 and the gas soft bag 271 is airtight and fixed.

[0169] That is, the air supply pipe 241 supplies air to the second air guide pipe 243 to expand the gas soft bag 271. The expanded gas soft bag 271 can drive the sealing plates 272 to approach each other until they collide with each other, thereby providing an independent space for the painting operation and reducing the flying of paint mist.

[0170] The sealing plate 272 is a rectangular frame with a hollow interior, and an air outlet 2721 is opened on the inner wall close to the differential housing 300, and the two sealing plates 272 are parallel;

[0171] The air inlet end of the hot air pipe 273 is connected to the hot air source device, which is used to provide dry gas and send the dry gas into the hot air pipe 273. The hot air source device is fixed on the side plate 212. The hot air pipe 273 has two air outlet ends. One air outlet end of the hot air pipe 273 extends into a sealing plate 272. The hot air pipe 273 is a hose that can adapt to the expansion and contraction of the sealing plate 272.

[0172] A collection box 130 is placed below one end of the conveying track 120 , and the collection box 130 is used to collect the differential housing 300 after the painting operation.

[0173] It should be noted that hot air can be sent into the sealing plate 272 through the hot air pipe 273, and then sent into the paint spraying space through the air outlet 2721. The temperature of the hot air is in the range of 70° to 80°, which can dry the paint without damaging the paint surface.

[0174] On the basis of the above embodiment, after the valves of the air guide pipe 1 242 and the branch pipe 2421 are closed, the valve of the air guide pipe 243 is opened, and air is supplied to the air guide pipe 243 through the air supply pipe 241, so that the gas soft bag 271 expands, and the expanded gas soft bag 271 drives the sealing plates 272 to approach and contact each other, and then the spraying part 1 231 and the spraying part 2 261 spray primer on the inner and outer surfaces of the differential housing 300, providing an independent space for the painting operation and reducing the flying of paint mist;

[0175] After the primer is sprayed, hot air is sent into the sealing plate 272 through the hot air pipe 273, and the hot air is sent into the painting space through the air outlet 2721 to improve the adhesion efficiency of the paint particles and accelerate the drying speed of the paint. After the primer is dried and film-formed, the hot air pipe 273 stops supplying air, and the topcoat is sprayed on the inner and outer surfaces of the differential housing 300 through the first spray paint section 2651 and the second spray paint section 2331. The hot air pipe 273 continues to supply hot air to increase the speed of the paint film forming on the surface of the differential housing 300;

[0176] After the film is formed on the surface of the differential housing 300, the paint spraying assembly 200 is located above the collection box 130, the electromagnet 2634 is powered off, the valves of the air pipe 1 242, the branch pipe 2421 and the air pipe 2 243 are all opened, and the air pump is used to evacuate the air in the air supply pipe 241 so that the clamping part 263, the sealing part 264 and the sealing part 270 are all restored to their original state, and the sprayed differential housing 300 falls into the collection box 130. By repeating this operation, the uneven inner and outer surfaces of the differential housing 300 can be fully sprayed with high efficiency.

[0177] The above description is only a preferred embodiment of the present invention and is 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 paint spraying device for a differential case, comprising a conveying device (100), a conveying track (120) and a differential case (300), characterized in that: It also includes a paint spraying assembly (200), and the paint spraying assembly (200) is located above the conveying device (100); The painting assembly (200) comprises a support plate (210), a walking device (220), an inner painting section (230), an air intake section (240), a pressurizing section (250), and an outer painting section (260); The support plate (210) is located below the conveying track (120), and a walking device (220) is fixed on the support plate (210) near the conveying track (120), and the walking device (220) can drive the paint spraying assembly (200) to move along the direction of the conveying track (120); The differential housing (300) is an elliptical cylinder that is hollow inside, open at one end, and has one end that is large and the other end that is small. A protrusion (320) is fixed to the end of the differential housing (300) that is away from the opening. The raised portion (320) is a truncated cone with a hollow interior and openings at both ends; a through hole is provided on the differential housing (300) near the raised portion (320); a large diameter opening at one end of the raised portion (320) coincides with the through hole on the differential housing (300); A mounting seat (322) is fixed on the free end of the protruding portion (320), the mounting seat (322) being composed of a large circular ring and a small circular ring, the small diameter opening of the free end of the protruding portion (320) coincides with the small circular ring, the large circular ring and the small circular ring are fixed by a plurality of evenly spaced mounting plates (321), each mounting plate (321) having a mounting hole therein; The differential housing (300) is located between the inner painting portion (230) and the outer painting portion (260); The inner painting portion (230) is at the same painting distance from the inner surface of the differential housing (300) and the inner surface of the raised portion (320); The outer painting portion (260) is at the same painting distance from the outer surface of the differential housing (300) and the outer surface of the raised portion (320); The pressurizing part (250) is used to pressurize the inner painting part (230) and the outer painting part (260), so that the inner painting part (230) and the outer painting part (260) spray the inner and outer surfaces of the differential housing (300); The external painting part (260) comprises a clamping part (263), and the air inlet part (240) is used to supply air into the clamping part (263), so as to facilitate the clamping part (263) to position and clamp the second mounting plate (321).

2. The differential case painting device according to claim 1, characterized in that: The inner painting section (230) comprises an inner painting box (2301) and a painting section 1 (231); The inner spray paint box (2301) is an elliptical cylinder with a hollow interior and a large end and a small end. The inner spray paint box (2301) is filled with paint liquid. The inner spray paint box (2301) is fixed on the side panel 1 (211); The inner paint spray box (2301) is parallel to the differential housing (300), and a protrusion (232) is fixed to one end of the inner paint spray box (2301) close to the inner surface of the raised portion (320); The protrusion (232) is a truncated cone with a hollow interior and an opening at one end close to the inner spray paint box (2301); the protrusion (232) is connected to the interior of the inner spray paint box (2301); and the side surface of the protrusion (232) is parallel to the inner surface of the raised portion (320); The spraying part 1 (231) comprises a flat spray head 1 (2311), a curved spray head 1 (2312) and a concave spray head 1 (2313); The flat spray head 1 (2311) is fixed to one end of the inner spray paint box (2301) close to the inner surface of the differential housing (300), and the flat spray head 1 (2311) is used to spray the inner surface of the differential housing (300); The arc surface spray head 1 (2312) is fixed on the side of the convex block (232), and the concave surface spray head 1 (2313) is fixed on the free end of the convex block (232). Both the arc surface spray head 1 (2312) and the concave surface spray head 1 (2313) are used to spray the inner surface of the convex portion (320); The support plate (210) is a rectangular plate, and a side plate 1 (211) and a side plate 2 (212) are fixed to the two sides of the long side thereof respectively, and the inner spray paint box (2301) is fixed to the side of the side plate 1 (211) close to the differential housing (300); The distance between the free end of the inner spray paint box (2301) and the inner surface of the differential housing (300) is equal to the distance between the convex block (232) and the inner surface of the raised portion (320).

3. The differential case painting device according to claim 1, characterized in that: The external painting unit (260) further comprises an external painting box (2601) and a second painting unit (261); The outer spray paint box (2601) is an elliptical cylinder with a hollow interior and a large end and a small end, and a truncated cone-shaped groove (262) is formed at one end close to the inner spray paint box (2301), and the groove (262) is parallel to the protrusion (232); The outer spray paint box (2601) is fixed on a side of the second side plate (212) close to the differential housing (300), the outer spray paint box (2601) is filled with paint liquid, and the outer spray paint box (2601) and the inner spray paint box (2301) are parallel; The boosting part (250) comprises a boosting tube 1 (251), the boosting tube 1 (251) having two output ends, one output end of the boosting tube 1 (251) extending into the inner spray paint box (2301), and one output end of the boosting tube 1 (251) extending into the outer spray paint box (2601); The second spraying part (261) includes a second flat spray head (2611) and a second curved spray head (2612); The second flat spray head (2611) is fixed on one end of the outer spray paint box (2601) close to the differential housing (300), and the second flat spray head (2611) is used to spray the outer surface of the differential housing (300); The second arc surface spray head (2612) is fixed on the groove (262), and the second arc surface spray head (2612) is used to spray the outer surface of the raised portion (320).

4. The differential case painting device according to claim 3, characterized in that: The groove (262) comprises a curved surface and a bottom surface, and a circular groove is formed on the bottom surface of the groove (262); The clamping portion (263) comprises a ventilation pipe 1 (2631), the ventilation pipe 1 (2631) being a circular ring body with a hollow interior and fixed in the circular groove of the groove (262); A plurality of connecting tubes (2632) are evenly spaced and fixed to one end of the vent pipe 1 (2631) close to the differential housing (300), and a telescopic bag (2635) is fixed to the free end of each connecting tube (2632); A clamping rod (2633) is fixed to the free end of each of the telescopic bags (2635), the clamping rod (2633) being a cylinder with a hollow interior and an opening at one end close to the first ventilation pipe (2631), one clamping rod (2633) being located outside one connecting pipe (2632), and one clamping rod (2633) being parallel to a mounting hole of a second mounting plate (321); The air intake portion (240) comprises an air supply pipe (241), the air supply pipe (241) is fixed on the second side plate (212), an air guide pipe (242) is fixed on the air outlet end of the air supply pipe (241), and the air intake end of the air supply pipe (241) is connected to an air pump; The air outlet end of the first air guide tube (242) extends into the first ventilation tube (2631). After air enters the air supply tube (241), air is supplied to the first ventilation tube (2631) through the first air guide tube (242), so that the telescopic bag (2635) drives the clamping rod (2633) to extend into the installation hole of the second installation plate (321).

5. The differential case painting device according to claim 4, characterized in that: A circular electromagnet (2634) is fixed outside the plurality of clamping rods (2633); The diameter of the electromagnet (2634) is equal to the diameter of the large circular ring of the mounting seat (322). After the clamping rod (2633) extends into the mounting hole of the second mounting plate (321), the electromagnet (2634) is energized to be magnetically attracted to the mounting seat (322).

6. The differential case painting device according to claim 3, characterized in that: The second spraying part (261) further comprises a plurality of nozzles (2613), wherein the plurality of nozzles (2613) are evenly spaced and fixed on the bottom surface of the groove (262); There are gaps between adjacent second mounting plates (321), and the nozzle (2613) is used to spray the gap spaces between the plurality of second mounting plates (321).

7. The differential case painting device according to claim 4, characterized in that: A plurality of mounting plates (310) are evenly spaced and fixed on the side of the differential housing (300), and each mounting plate (310) has a mounting hole therein; The external spray paint part (260) further comprises a blocking part (264), the blocking part (264) blocking the mounting hole of the first mounting plate (310), and a mounting groove is formed on the end surface of the external spray paint box (2601) close to the differential housing (300); The blocking portion (264) comprises a second vent pipe (2641), which is an elliptical ring body with a hollow interior and is fixed in a mounting groove of the outer spray paint box (2601); The air guide pipe 1 (242) has two air outlet ends, a branch pipe (2421) is fixed on one of the air outlet ends of the air guide pipe 1 (242), the air outlet end of the branch pipe (2421) extends into the ventilation pipe 2 (2641), a valve is fixed on the air guide pipe 1 (242) near the ventilation pipe 1 (2631), and a valve is fixed on the branch pipe (2421) away from the ventilation pipe 1 (2631); A plurality of long soft bags (2642) are evenly spaced and fixed on the free end of the second ventilation pipe (2641), and one long soft bag (2642) is parallel to a mounting hole on the first mounting plate (310); A material storage bag (2643) is fixed to the free end of each of the long soft bags (2642), and the material storage bag (2643) is filled with gravity powder.

8. The differential case painting device according to claim 3, characterized in that: The inner spray paint section (230) further comprises a material storage box (233), wherein the material storage box (233) is fixed inside the inner spray paint box (2301), the inner spray paint box (2301) is filled with a primer, and the material storage box (233) is filled with a topcoat; The first storage box (233) is fixed with a second paint spraying unit (2331), and the second paint spraying unit (2331) is used to spray topcoat the inner surface of the differential housing (300) and the inner surface of the raised portion (320); The external paint spraying unit (260) further comprises a second material storage box (265), wherein the second material storage box (265) is fixed inside the external paint spraying box (2601), the external paint spraying box (2601) is filled with a primer, and the second material storage box (265) is filled with a topcoat; A paint spraying unit (2651) is fixed on the second material storage box (265), and the paint spraying unit (2651) is used to spray topcoat the outer surface of the differential housing (300) and the outer surface of the raised portion (320); The boosting part (250) further comprises a second boosting tube (252), the second boosting tube (252) having two output ends, one output end of the second boosting tube (252) extending into the first material storage box (233), and one output end of the second boosting tube (252) extending into the second material storage box (265).

9. The differential case painting device according to claim 8, characterized in that: The spraying distances of the spraying section 1 (2651) and the spraying section 2 (261) are equal, and the spraying distances of the spraying section 2 (2331) and the spraying section 1 (231) are equal; The paint spraying pressure of the booster pipe 1 (251) is in the range of 0.1MPa to 0.2MPa, and the paint spraying pressure of the booster pipe 2 (252) is in the range of 0.3MPa to 0.4MPa.

10. The differential case painting device according to claim 1, characterized in that: The paint spraying assembly (200) further includes a sealing portion (270); The sealed portion (270) includes two gas soft bags (271) and a hot air pipe (273); The gas soft capsule (271) is a capsule body in the shape of a rectangular frame. One gas soft capsule (271) is fixed on the first side plate (211), and one gas soft capsule (271) is fixed on the second side plate (212). The inner spray paint part (230) is located in the middle of one gas soft capsule (271), and the outer spray paint part (260) is located in one gas soft capsule (271). A sealing plate (272) is fixed to the free end of each gas soft bag (271); the air supply pipe (241) has two air outlet ends; a second air guide pipe (243) is fixed to one of the air outlet ends of the air supply pipe (241); the second air guide pipe (243) has two air outlet ends; one of the air outlet ends of the second air guide pipe (243) extends into a gas soft bag (271); The sealing plate (272) is a rectangular frame with a hollow interior, and an air outlet (2721) is provided on the inner wall thereof close to the differential housing (300), and the two sealing plates (272) are parallel; The air inlet end of the hot air pipe (273) is connected to the hot air source device, and the hot air pipe (273) has two air outlet ends, one of which extends into a sealing plate (272).

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