Aluminum alloy wheel surface treatment apparatus

Abstract

The application relates to the technical field of hub processing, and particularly discloses an aluminum alloy wheel surface treatment equipment, which comprises a rack, a treatment pool arranged on the rack, a fixing cylinder slidingly connected to the rack, a bearing part arranged on the fixing cylinder and used for bearing a hub, a servo air cylinder arranged on the rack and used for driving the fixing cylinder to slide, a secondary positioning part arranged on the periphery of the fixing cylinder, and a pressure applying mechanism arranged in the fixing cylinder and used for driving the bearing part to slide. In the early stage, the workpiece is supported by the bearing part for immersion, the support point is automatically retracted from the hub in the later stage, the secondary positioning part is tightly fixed from the inner side of the hub, no structure is blocked in the immersion stage, the whole surface of the wheel can fully contact the treatment agent, the treatment blind area is completely eliminated, and the peeling of the plating layer and the color difference defect caused by incomplete local oil removal and oxidation are avoided.

Description

Technical Field

[0001] This invention relates to the field of wheel hub processing technology, specifically to a surface treatment device for aluminum alloy wheels. Background Technology

[0002] The domestic automotive OEM industry is continuously upgrading and iterating, and the full range of travel and transportation scenarios has placed high-standard requirements on the overall service quality and appearance compatibility of the wheel components. Compared with traditional steel wheels, aluminum alloy wheels have completely replaced steel wheels due to their multiple core advantages, such as lightweight, high strength, excellent formability, good shock absorption and noise reduction, and low maintenance costs. They are widely used in mass-produced vehicles, including passenger cars and commercial vehicles, and have become a core component of the vehicle chassis.

[0003] After aluminum alloy wheels are die-cast, the surface of the blanks generally retains original surface defects such as casting oxide scale, die-casting demolding oil stains, microscopic burrs, and impurities from mold joints. If professional and complete surface finishing and protection treatments are not performed before subsequent finishing processes such as painting and electroplating, quality problems such as coating delamination, surface corrosion and discoloration, paint color difference, and uneven film adhesion are very likely to occur. Under the complex service conditions of vehicles in the subsequent outdoor high and low temperature cycles and wind, dust, and rain corrosion, the defects will continue to expand, eventually leading to failures such as surface peeling, rust, cracking, and detachment, significantly shortening the wheel's entire service life and severely reducing the overall appearance quality and operational stability of the vehicle.

[0004] For high-end precision machining requirements such as mirror chrome plating and electroplating of aluminum alloy wheels, the industry generally adopts a multi-stage chemical bath immersion pretreatment process. This is a core process to ensure the firm adhesion of subsequent plating layers and improve the uniformity and yield of surface treatment. The complete pretreatment process requires the sequential completion of multiple steps, including degreasing immersion, water washing, oxide film removal immersion, clean water rinsing, and zinc / chemical tin plating immersion. Through stepwise modification treatment with different chemical baths, impurities and the original oxide layer on the wheel surface are thoroughly removed, and a stable surface transition layer is built, providing a reliable foundation for subsequent copper, nickel, and chrome plating processes.

[0005] Currently, in existing chemical immersion surface treatment processes for aluminum alloy wheels, to ensure the stability of the wheels in the chemical bath, avoid workpiece stacking and collision, and adapt to automated production line operations, a common practice is to use special fixtures to hold and fix the wheels. For example, the surface treatment process and device for aluminum alloy wheels of commercial vehicles disclosed in existing patent CN119259414A achieves wheel alignment protection and anti-oil deposition treatment through a support mechanism and gear rack and pinion positioning structure, which optimizes the spraying treatment effect to a certain extent. However, there are still significant technical shortcomings in the pre-chemical immersion treatment process.

[0006] The existing fixed-clamp immersion process has inherent technical flaws: the fixed clamping area between the clamp and the wheel creates a physical barrier, preventing sufficient contact between this area and the chemical bath, resulting in a processing blind spot. This leads to incomplete removal of oil and oxide film from the clamped area, and incomplete coverage of the transition coating. Subsequent electroplating and painting operations can cause quality defects such as coating peeling, localized corrosion, and color difference marks in the blind spot, significantly reducing the uniformity of the wheel surface treatment and the quality of the finished product, thus affecting the long-term service performance of the wheel.

[0007] To address the issue of blind spots in clamping, some industries employ a clamp-free, fully immersed process. This involves completely submerging aluminum alloy wheels in a chemical bath for free immersion, eliminating clamping obstructions and ensuring full contact between the entire wheel surface and the bath for uniform modification. However, this method introduces new technical challenges: with the wheel fully submerged without a fixed clamping or positioning structure, it's difficult to quickly, accurately, and safely retrieve the workpiece after the process is complete. This leads to workpiece accumulation, damage from impacts, and low retrieval efficiency, severely impacting the automated production line's workflow, significantly reducing overall production efficiency, and failing to meet the demands of large-scale mass production.

[0008] This application proposes a novel aluminum alloy wheel surface treatment device that fundamentally solves the core pain points of existing technologies by dynamically switching fixed positions during the wheel's immersion in a chemical bath. Summary of the Invention

[0009] The purpose of this invention is to provide a surface treatment device for aluminum alloy wheels to solve the problems mentioned in the background art.

[0010] To achieve the above objectives, the present invention provides the following technical solution: an aluminum alloy wheel surface treatment device, comprising a frame and a treatment tank disposed on the frame, a fixed cylinder slidably connected to the frame, a support member for supporting the wheel hub disposed on the fixed cylinder, and a servo cylinder for driving the fixed cylinder to slide on the frame; a secondary positioning part is also disposed on the periphery of the fixed cylinder, and a pressure applying mechanism for driving the support member to slide is disposed inside the fixed cylinder. When the servo cylinder drives the fixed cylinder and the wheel hub to be inside the treatment tank and to contact each other for a period of time, the pressure applying mechanism drives the support member to slide inward to the fixed cylinder to disengage from the wheel hub, thereby driving the secondary positioning part to fix the inner side of the wheel hub.

[0011] Furthermore, the carrier includes a carrier plate slidably connected to the fixed cylinder, each carrier plate is fixedly connected to a connecting rack, and a rotating rod is rotatably connected inside the fixed cylinder. A linkage rack is installed on the rotating rod, and the two connecting racks are respectively meshed on the upper and lower sides of the linkage gear.

[0012] Furthermore, the secondary positioning part includes a positioning block slidably connected to the side wall of the fixed cylinder. The positioning block is slidably connected to the fixed cylinder through a connecting rod, and a return spring is provided between the positioning block and the fixed cylinder. The elastic force of the return spring drives the positioning block to retract into the fixed cylinder.

[0013] Furthermore, the pressure-applying mechanism includes a mounting frame slidably connected inside the fixed cylinder. The mounting frame is connected to the carrier via a first transmission member, and is also connected to the secondary positioning part via a second transmission member. An electric telescopic rod is provided between the mounting frame and the fixed cylinder. When the electric telescopic rod drives the mounting frame to slide downward, the carrier is driven to slide into the fixed cylinder via the first transmission member. During this stroke, the secondary positioning part is driven by the second transmission member to press against the inner side of the wheel hub, thereby fixing the wheel hub for the second time.

[0014] Furthermore, the first transmission component includes a pressure rack fixedly connected to the mounting bracket, and a pressure gear meshing with the pressure rack is mounted on the rotating rod.

[0015] Furthermore, the second transmission component includes a pressure rod fixedly connected to the connecting frame, a pressure block fixedly connected to the bottom of the pressure rod, and a force-bearing block fixedly connected to the connecting rod, with an adaptation groove on the force-bearing block that matches the pressure block.

[0016] Furthermore, the positioning block is also provided with an elastic buffer.

[0017] Furthermore, the elastic buffer includes a contact block, which is slidably connected to the positioning block via a guide limiting part, and a plurality of positioning springs are provided between the contact block and the positioning block.

[0018] Furthermore, the servo cylinder and the fixed cylinder are connected by a connector.

[0019] Furthermore, a drain pipe is provided on the outside of the treatment tank, and a valve is installed on the drain pipe.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: In the process of using this aluminum alloy wheel surface treatment equipment, the workpiece is initially supported by the carrier for immersion, and the support point automatically retracts inward and detaches from the wheel hub in the later stage. At the same time, the secondary positioning part is tightened and fixed from the inside of the wheel hub. There is no structural obstruction during the immersion stage, and the entire surface of the wheel can fully contact the treatment agent, completely eliminating the treatment blind spots and avoiding coating peeling and color difference defects caused by incomplete local degreasing and oxidation. After switching to the inner positioning, the material can be stably hoisted and discharged without the need for haphazard retrieval without clamps, preventing the wheel hub from being bumped and scratched. One set of equipment completes immersion and fixed-point hoisting in sequence, simplifying the tooling structure and improving the surface treatment quality of the wheel hub and the efficiency of automated production line operation. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0022] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of the present invention; Figure 2 This is a partial structural schematic diagram provided for an embodiment of the present invention; Figure 3 This is a schematic diagram of the hub mounting method provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the installation method of the carrier and the secondary positioning part provided in the embodiment of the present invention; Figure 5 This is a schematic diagram of the fixed cylinder in a concealed state according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the pressure application mechanism provided in an embodiment of the present invention; Figure 7 This is a partial structural diagram of the secondary positioning part provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the secondary positioning part in an exploded state, provided in an embodiment of the present invention. Figure 9 This is a partial structural diagram of the support member provided in an embodiment of the present invention.

[0023] Explanation of reference numerals in the attached drawings: 1. Frame; 2. Treatment tank; 3. Hub; 4. Servo cylinder; 5. Connector; 6. Fixing cylinder; 7. Bearing component; 71. Bearing plate; 72. Connecting rack; 73. Rotating rod; 74. Linkage gear; 8. Secondary positioning part; 81. Positioning block; 82. Connecting rod; 83. Force-bearing block; 84. Adaptor groove; 85. Return spring; 86. Contact block; 87. Positioning spring; 9. Pressure applying mechanism; 91. Mounting bracket; 92. Pressure rack; 93. Pressure gear; 94. Pressure rod; 95. Pressure block; 10. Electric telescopic rod; 11. Drain pipe. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Please see Figures 1-9This invention provides a technical solution: an aluminum alloy wheel surface treatment device, including a frame 1 and a treatment pool 2 disposed on the frame 1. A fixed cylinder 6 is slidably connected to the frame 1. A support member 7 for supporting a wheel hub 3 is disposed on the fixed cylinder 6, and a servo cylinder 4 for driving the fixed cylinder 6 to slide is disposed on the frame 1. A secondary positioning part 8 is also disposed on the periphery of the fixed cylinder 6, and a pressure applying mechanism 9 for driving the support member 7 to slide is disposed inside the fixed cylinder 6. When the servo cylinder 4 drives the fixed cylinder 6 and the wheel hub 3 to be inside the treatment pool 2 and in contact for a period of time, the pressure applying mechanism 9 drives the support member 7 to slide inward to the fixed cylinder 6 to disengage from the stroke of the wheel hub 3, and drives the secondary positioning part 8 to fix the inner side of the wheel hub 3.

[0026] Specifically, the aluminum alloy wheel surface treatment equipment uses a frame 1 as the mounting base for the whole machine. Inside the frame 1, a treatment tank 2 containing chemical treatment agents is fixed. A fixed cylinder 6 can be vertically slidably mounted on the frame 1. The outer periphery of the fixed cylinder 6 is equipped with a bearing component 7 to support the wheel hub 3 blank. The frame 1 is equipped with a power component to drive the fixed cylinder 6 to lift and lower as a whole. Multiple sets of secondary positioning parts 8 are distributed around the side wall of the fixed cylinder 6. A pressure applying mechanism 9 is installed in the inner cavity of the fixed cylinder 6. The pressure applying mechanism 9 is mechanically linked with the bearing component 7 and the secondary positioning part 8 respectively.

[0027] During use, in the initial stage, the support member 7 extends to support the inner ring of the aluminum alloy wheel. The servo cylinder 4 drives the fixing cylinder 6 to lower the wheel hub 3 as a whole into the chemical solution in the treatment pool 2. During the set soaking time, the wheel hub 3 is only supported by the outer support member 7. The support points and the contact area of ​​the wheel hub 3 are continuously soaked in the chemical solution to eliminate the clamping blind spot. After the soaking process is completed, the fixing cylinder 6 remains below the liquid surface. The pressure mechanism 9 is activated to pull the support member 7 inward to retract and detach from the wheel hub 3. During the synchronous stroke of the support member 7 retracting, the pressure mechanism 9 synchronously drives the peripheral secondary positioning part 8 to press outward from the inner wall of the wheel hub 3. The workpiece is fixed by multiple points of support inside the wheel hub 3. When the equipment lifts the fixing cylinder 6, it relies on the inner secondary positioning to lift the wheel hub 3 away from the chemical solution.

[0028] In the embodiments provided by the present invention, the support member 7 includes a support plate 71 slidably connected to the fixed cylinder 6. Each support plate 71 is fixedly connected to a connecting rack 72, and a rotating rod 73 is rotatably connected inside the fixed cylinder 6. A linkage rack is installed on the rotating rod 73, and the two connecting racks 72 are respectively meshed on the upper and lower sides of the linkage gear 74. When the rotating rod 73 rotates in the forward direction, the linkage gear 74 meshes with the upper and lower connecting racks 72 respectively, causing the support plates 71 on both sides to extend outward synchronously to support the inner end face of the wheel hub 3; when the rotating rod 73 rotates in the reverse direction, the gear pulls the connecting racks 72 on both sides to retract towards each other, causing the support plates 71 to retract synchronously into the fixed cylinder 6 to release the support limit on the wheel. The racks on both sides share a single gear to achieve synchronous forward and backward movement.

[0029] In the embodiments provided by the present invention, the secondary positioning part 8 includes a positioning block 81 slidably connected to the side wall of the fixed cylinder 6. The positioning block 81 is slidably connected to the fixed cylinder 6 via a connecting rod 82, and a return spring 85 is provided between the positioning block 81 and the fixed cylinder 6. The elastic force of the return spring 85 drives the positioning block 81 to retract inside the fixed cylinder 6. When there is no external force pressing the connecting rod 82, the return spring 85 continuously contracts, causing the positioning block 81 to retract and hide inside the cylinder, without interfering with the fitting of the hub 3. When the connecting rod 82 is pressed inward by an external force, it overcomes the spring tension and pushes the positioning block 81 outward from the cylinder wall, pressing against the inner ring of the hub 3 to achieve internal support and fixation. After the external force is removed, the spring rebounds and pulls the positioning block 81 to retract and reset.

[0030] In the embodiments provided by the present invention, the pressure applying mechanism 9 includes a mounting frame 91 slidably connected inside the fixed cylinder 6. The mounting frame 91 is connected to the bearing member 7 via a first transmission member, and the mounting frame 91 is connected to the secondary positioning part 8 via a second transmission member. An electric telescopic rod 10 is provided between the mounting frame 91 and the fixed cylinder 6. When the electric telescopic rod 10 drives the mounting frame 91 to slide downward, during the stroke of the bearing member 7 being driven to slide into the fixed cylinder 6 via the first transmission member, the secondary positioning part 8 is driven by the second transmission member to press the inner side of the wheel hub 3, thereby fixing the wheel hub 3 for the second time. During use, the electric telescopic rod 10 extends and pushes the mounting frame 91 vertically downward. The mounting frame 91 descends and drives the rotating rod 73 to rotate in the opposite direction via the first transmission structure, causing the bearing plate 71 to retract inward and detach from the wheel. The mounting frame 91 descends synchronously and squeezes each set of connecting rods 82 inward through the second transmission structure, linking the outer positioning block 81 to extend outward and press against the inner wall of the wheel hub 3, realizing the synchronous linkage of bearing retraction and inner support fixation. The electric telescopic rod 10 retracts and drives the mounting frame 91 to move upward. The two sets of transmission structures simultaneously remove the external force, the bearing plate 71 extends outward and resets, and the positioning block 81 retracts and unlocks.

[0031] In the embodiments provided by the present invention, the first transmission component includes a pressure rack 92 fixedly connected to the mounting frame 91, and a pressure gear 93 meshing with the pressure rack 92 is mounted on the rotating rod 73. When the mounting frame 91 moves downward following the electric telescopic rod 10, the pressure rack 92 moves downward synchronously and meshes with the pressure gear 93 to rotate. The linear displacement of the rack is converted into the circular motion of the gear, thereby driving the rotating rod 73 to rotate and retract the bearing plate 71. When the mounting frame 91 is raised upward, the rack moves upward in the opposite direction to drive the gear to reverse, and the bearing plate 71 extends outward and resets.

[0032] In the embodiments provided by the present invention, the second transmission component includes a pressure rod 94 fixedly connected to the connecting frame, a pressure block 95 fixedly connected to the bottom of the pressure rod 94, and a force-receiving block 83 fixedly connected to the connecting rod 82. The force-receiving block 83 has an adaptation groove 84 adapted to the pressure block 95. When the mounting frame 91 moves down, it causes the pressure block 95 to move downward into the adaptation groove 84. The inclined surface presses the force-receiving block 83, causing the connecting rod 82 to move horizontally towards the inside of the cylinder, pushing the positioning block 81 to expand outward and press against the hub 3, thus fixing the hub 3. After the mounting frame 91 is raised, the pressure block 95 disengages from the adaptation groove 84, and the connecting rod 82 automatically retracts under the action of the return spring 85.

[0033] In the embodiments provided by the present invention, the positioning block 81 is also provided with an elastic buffer. When the positioning block 81 extends outward and presses against the inner wall of the wheel hub 3, the buffer contacts the workpiece first. The elastic structure buffers the impact force at the moment of pressing, avoiding the rigid pressing causing indentation and bump damage to the inner wall of the aluminum alloy wheel hub 3.

[0034] In the embodiments provided by the present invention, the elastic buffer includes a contact block 86, which is slidably connected to the positioning block 81 via a guide limiting part. A plurality of positioning springs 87 are provided between the contact block 86 and the positioning block 81. When the contact block 86 is pressed, it retracts toward the positioning block 81 to compress the internal spring, and absorbs the clamping impact force by means of spring deformation. After the clamping external force is removed, the spring pushes the contact block 86 to automatically extend and reset.

[0035] In the embodiments provided by the present invention, the servo cylinder 4 and the fixed cylinder 6 are connected by a connector 5. The extension and retraction of the servo cylinder 4 pulls the fixed cylinder 6 to rise and fall vertically along the frame 1 via the connector 5, accurately controlling the depth of the wheel hub 3 immersed in the liquid and the lifting height, and the soaking time can be flexibly adjusted according to different processing procedures.

[0036] In the embodiments provided by the present invention, a drain pipe 11 is provided on the outside of the treatment tank 2, and a valve is provided on the drain pipe 11. During normal production, the valve is closed and the soaking agent is retained inside the treatment tank 2. When the agent needs to be replaced when it expires, the valve is opened and the waste liquid in the tank is discharged through the drain pipe 11 to complete the liquid replacement maintenance.

[0037] In the initial state, the bearing plate 71 extends outward to support the inner ring of the aluminum alloy hub 3. The servo cylinder 4 drives the fixed cylinder 6 to descend as a whole through the connecting piece 5. The hub 3 is completely immersed in the chemical solution in the treatment tank 2 for soaking treatment. It is supported by the outer bearing point, with no dead corners for clamping, and the entire hub 3 is in full contact with the chemical agent. After the soaking meets the standard, the fixed cylinder 6 remains stationary in the chemical solution. The electric telescopic rod 10 drives the mounting frame 91 to slide downward. The pressure rack 92 on the mounting frame 91 meshes with the pressure gear 93, driving the rotating rod 73 to rotate. The connecting racks 72 on both sides retract, pulling the bearing plate 71 to retract towards the inside of the fixed cylinder 6 and detach it from the hub 3. At the same time, the pressure block 95 at the lower end of the mounting frame 91 presses down and embeds into the adapter groove 84 of the force block 83. The inclined surface squeezes the connecting rod 82 to overcome the elastic force of the return spring 85, pushing the positioning block 81 to extend from the cylinder wall. The elastic buffer at the end of the positioning block 81 is in close contact with the inner wall of the hub 3, and the hub 3 is fixed by multiple internal supports. Afterwards, the servo cylinder 4 lifts the fixed cylinder 6, and the inner secondary positioning structure lifts the wheel hub 3 to remove it from the liquid. After the process is completed, the electric telescopic rod 10 lifts the mounting frame 91, the pressure block 95 disengages from the adapter groove 84, the positioning block 81 retracts under the action of the return spring 85, and the bearing plate 71 extends outward again, so that the processed wheel hub 3 can be removed. The waste liquid in the treatment tank 2 can be replaced through the drain pipe 11 and the valve.

[0038] It should be noted that all electrical equipment involved in this application can be powered by a storage battery or an external power source, and this application is equipped with a control system for controlling the operation of the entire equipment.

[0039] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" 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 an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A surface treatment device for aluminum alloy wheels, comprising a frame (1) and a treatment tank (2) disposed on the frame (1), characterized in that: A fixed cylinder (6) is slidably connected to the frame (1). A bearing (7) for bearing the hub (3) is provided on the fixed cylinder (6), and a servo cylinder (4) for driving the fixed cylinder (6) to slide is provided on the frame (1). The fixed cylinder (6) is also provided with a secondary positioning part (8) on its periphery, and the fixed cylinder (6) is provided with a pressure mechanism (9) for driving the bearing (7) to slide. When the servo cylinder (4) drives the fixed cylinder (6) and the hub (3) to be inside the processing pool (2) and in contact for a period of time, the pressure mechanism (9) drives the carrier (7) to slide to the inside of the fixed cylinder (6) to disengage from the hub (3) during the stroke, and drives the secondary positioning part (8) to fix the inside of the hub (3).

2. The aluminum alloy wheel surface treatment equipment according to claim 1, characterized in that: The support member (7) includes a support plate (71) slidably connected to the fixed cylinder (6). Each support plate (71) is fixedly connected to a connecting rack (72), and a rotating rod (73) is rotatably connected inside the fixed cylinder (6). A linkage rack is installed on the rotating rod (73), and the two connecting racks (72) are respectively meshed on the upper and lower sides of the linkage gear (74).

3. The aluminum alloy wheel surface treatment equipment according to claim 2, characterized in that: The secondary positioning part (8) includes a positioning block (81) slidably connected to the side wall of the fixed cylinder (6). The positioning block (81) is slidably connected to the fixed cylinder (6) through a connecting rod (82), and a return spring (85) is provided between the positioning block (81) and the fixed cylinder (6). The elastic force of the return spring (85) drives the positioning block (81) to retract into the fixed cylinder (6).

4. The aluminum alloy wheel surface treatment equipment according to claim 3, characterized in that: The pressure application mechanism (9) includes a mounting frame (91) that is slidably connected inside the fixed cylinder (6). The mounting frame (91) is connected to the bearing (7) via a first transmission member, and the mounting frame (91) is connected to the secondary positioning part (8) via a second transmission member. An electric telescopic rod (10) is provided between the mounting frame (91) and the fixed cylinder (6). When the electric telescopic rod (10) drives the mounting bracket (91) to slide downward, the first transmission component drives the bearing component (7) to slide into the fixed cylinder (6) during the stroke. The second transmission component drives the secondary positioning part (8) to squeeze the inner side of the hub (3) and fix the hub (3) for a second time.

5. The aluminum alloy wheel surface treatment equipment according to claim 4, characterized in that: The first transmission component includes a pressure rack (92) fixedly connected to the mounting bracket (91), and a pressure gear (93) meshing with the pressure rack (92) is mounted on the rotating rod (73).

6. The aluminum alloy wheel surface treatment equipment according to claim 4, characterized in that: The second transmission component includes a pressure rod (94) fixedly connected to the connecting frame. A pressure block (95) is fixedly connected to the bottom of the pressure rod (94), and a force-bearing block (83) is fixedly connected to the connecting rod (82). An adaptation groove (84) adapted to the pressure block (95) is provided on the force-bearing block (83).

7. The aluminum alloy wheel surface treatment equipment according to claim 3, characterized in that: The positioning block (81) is also provided with an elastic buffer.

8. The aluminum alloy wheel surface treatment equipment according to claim 7, characterized in that: The elastic buffer includes a contact block (86), which is slidably connected to the positioning block (81) through a guide limiting part, and a plurality of positioning springs (87) are provided between the contact block (86) and the positioning block (81).

9. The aluminum alloy wheel surface treatment equipment according to claim 1, characterized in that: The servo cylinder (4) and the fixed cylinder (6) are connected by a connector (5).

10. The aluminum alloy wheel surface treatment equipment according to claim 1, characterized in that: A drain pipe (11) is provided on the outside of the treatment tank (2), and a valve is provided on the drain pipe (11).

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