- Tire assembly modification should be analyzedfull cycle, not only lifted from the ground to the height of the wheel hub.
- Fixtures are available fromCenter hole, outer circle, tread or bottom liftBuild strength, but protect the appearance and valve.
- The manipulator bears the weight, and the operator mainly completesGuidance, rotation and stud alignment。
- Compatibility with multiple specifications requires verificationDiameter, width, weight, offset and alignmentborder.
The online assembly of tire and wheel hub assembly may seem simple, but it actually involves taking parts from the material rack or conveyor position, lifting, flipping or standing up, approaching the wheel end, adjusting the hole position, pushing in the stud, and releasing and returning. When manually lifting repeatedly, the burden comes not only from the weight, but also from the posture of holding the object away from the body, rotational alignment, and rhythm repetition.
01First, let’s break down where the labor burden comes from.
- Bending, leaning or twisting when picking up tires from low racks.
- After lifting to the height of the wheel end, you need to continue to hold it and wait for alignment.
- The workpiece is moved away from the body, and the arms and lower back bear greater torque.
- Rotate the tire to find the hole location while also controlling the front and rear position.
- Different vehicle heights, tire specifications and changes in rhythm cause inconsistent movements.
Therefore, the modification goal should not only be written as "reduce the lifting weight", but should improve the load-bearing, posture and repetitive movements in the entire pick-up-alignment-release cycle.
02Common Tooling Types
| Tooling Type | force position | Application and attention |
|---|---|---|
| Center hole inner support | hub center hole | Clear positioning; need to confirm aperture range and contact protection |
| Outer circle holding clip | tire tread or sidewall | Adapt to a certain diameter range; avoid local indentation and slippage |
| Bottom lift | under tire | The structure is intuitive; flipping and large-angle postures need to prevent slipping out |
| Combination fixture | Lifting + Limiting/Clamping | High stability; pay attention to fixture weight and operating space |
tooling contacts should avoid valves, dynamic balance weights, wheel hub exterior surfaces and other vulnerable areas. When the range of car models is large, you should not only judge by the outer diameter, but also compare the width, weight, center hole, offset and assembly direction.
03The manipulator bears the weight and the human is responsible for guiding it.
The equipment should balance the tire weight during pick-up, lifting and alignment, allowing the operator to complete horizontal guidance, axial push-in and angle fine-tuning with less force. The degree of freedom at the end must match the process: too little freedom will limit alignment, and too much freedom may cause the workpiece to swing and rotate out of control.
The operating feel during the alignment phase is particularly important. Clamp dead weight, center of gravity offset, joint friction, actuation force, and stop drift all affect stud alignment. The actual team operators should participate in the commissioning of the prototype, not just the demonstration by the equipment commissioning personnel.
04How to reduce redundant movements in workstation layout
The pick-up position, manipulator installation center and wheel end assembly position should form short and clear paths as much as possible. Avoid having the operator back up the vehicle, cross the conveyor line, or go around under the manipulator body. The height and opening of the material rack should be easy to access by the tooling, and the empty, full and replenishing status of the material rack should be verified.
If the vehicle moves with the conveyor line, it is also necessary to clarify the station stopping accuracy, vehicle height change and operation window. The manipulator should not chase the moving target through excessive arm span; repeatable assembly positions should be ensured from the process cycle time and line interface.
05Compatible design for multiple specifications of tires
- Create diameter, width, weight, center bore and hub offset matrices.
- Clarify the scale, locking and adjustment in place detection of the adjustable clamp.
- When the difference is obvious, use quick-change contact modules and set model error-proofing.
- Verify clamping, lifting, rotation, alignment and release per specification.
- Incorporate low-frequency specifications such as winter tires, spare wheels or special wheels into boundary management.
06Safety design essentials
the tooling must not be lifted before the clamping or support is confirmed; the workpiece must not be released before it enters the wheel end or safe support position. The manipulator needs to be restricted from entering areas where vehicles, conveying equipment or people should not go, and hoses, handles and tooling units must be prevented from snagging on the body, racks or studs.
After a loss of air or power, the fixture should maintain its intended condition and provide a method for controlled unloading. If the tire is in the air or in the middle of the alignment, the operating instructions should explain how to exit safely, and the operator cannot be relied on to continue to bear weight with his hands.
07Simultaneous acceptance of cycle time and ergonomics
| Verification Item | Observation content | target |
|---|---|---|
| full beat | Continuous loop from pickup to return | Stably meets the process window |
| Operating posture | Bending, leaning, twisting and lifting continuously | Significantly reduce negative posture |
| Counterpoint feel | Starting force, rotation, axial trim and stop drift | Operator controllable and consistent |
| Specification coverage | Smallest, largest, heaviest and special sizes | All passed within declaration boundaries |
| Exception recovery | Insufficient clamping, energy failure and vehicle not in place | No hazardous releases or forced assembly |
The assembly of tires and wheels is suitable for taking advantage of the characteristics of the Pneumatic Industrial Manipulator to "bear the weight and retain manual guidance". Only by designing fixtures, degrees of freedom, layout and multi-specification management together can we truly reduce repeated lifting, instead of turning manual lifting into a confrontation between the operator and the equipment.