- Working RadiusLonger is not better, should be comprehensively determined based on the distance between pick and place points, work station layout, load, fixture weight, operating feel, stability and safe space.
- The arm length isStructure size, the working radius isActual available range, also affected by the rotation angle, fixture length, column position and obstacles.
- Too long will bringThe torque increases, the operating inertia increases, the stability decreases, the area occupied increases, and the risk of interference increases.。
- The site layout, workpiece parameters, fixture form and action process are the keys to determining the radius; the more complete the information, the easier it is to accurately select.
If the working radius is selected too small, the equipment may not be able to reach the material pickup point or the material discharge point; if it is selected too large, it will cause problems such as increased torque, increased operating inertia, increased area of occupation, and increased risk of interference. For procurement, process engineers and project leaders, understanding "how to choose a handling radius" is more important than simply pursuing a longer arm span.
01What is the operating radius of the Pneumatic Industrial Manipulator?
The working radius usually refers to the horizontal working distance that the Pneumatic Industrial Manipulator can cover from the rotation center or installation reference point to the working point of the clamp - that is, the range of picking, transporting and discharging materials that the clamp can reach when the equipment is installed in a certain installation position.
It should be noted that the working radius is not exactly the same as the arm length: the arm length is the structural size of the equipment, and the working radius is the actual available range. The actual usable range is also affected by the rotation angle, joint structure, fixture length, workpiece size, column position, obstacles, operator position and safety limits. For example, for the same equipment with an arm length of 3 meters, if the position of the column, the extension length of the clamp is different, and the angle of rotation is different, the actual coverage may vary greatly.
02The relationship between operating radius, arm length, rotation angle and coverage
The coverage area of a Pneumatic Industrial Manipulator is usually determined by the arm length and the rotation angle: the arm length determines the maximum horizontal extension distance of the equipment, and the rotation angle determines the sector area that can be covered. The folding arm structure also needs to consider the combined movements of the inner and outer arms, and whether it can avoid equipment, shelves and personnel passages after folding.
The working radius generally needs to cover the material pick-up point, the material discharge point and the intermediate movement path, rather than just the straight-line distance between two points. On-site handling is often not a "point-to-point straight line movement" and may require bypassing machine tool doors, conveyor lines, guardrails, columns, material racks or operator positions. Therefore, a reasonable solution is usually not to select the arm length based only on the maximum distance, but to first draw the field plane range, and then determine the available operating radius based on the action path and interference conditions.
03Why isn’t the longer the working radius, the better?
- The greater the torque: For a workpiece of the same weight, the farther away from the center of rotation, the greater the bending moment the structure bears, and the higher the requirements for the fixation of columns, bases, joints, bearings and feet, which may lead to an increase in structural specifications and costs.
- The operating inertia increases: The inertia of the long arm is more obvious when starting, stopping and rotating, and the stopping position is not easy to control, which affects the operation feel of accurate material discharging, assembly positioning, and machine tool loading and unloading.
- Stability may decrease: When the working radius is too large, the shaking of the end-effector tooling and the workpiece will be more obvious, especially when the fixture is heavy, the center of gravity is offset, or the cycle time is fast.
- Increased space occupied: Coverage is larger, taking up more workshop space and increasing overlap with personnel passages, forklift routes, adjacent equipment, and material racks.
- Increased risk of interference: The larger the arm length, the larger the sweeping range, and the easier it is to hit the machine tool shell, conveyor line, column, pipeline, bridge or other tooling.
04How to determine a reasonable operating radius
1. Confirm the distance between the pick-up point and the discharge point
First confirm the position of the pick-and-place point relative to the equipment installation center, not only the distance between the two points, but also the distance between them and the columns, rails or hanging points. For multiple pick-and-place points, the farthest effective working point should be used as the basis, and whether there will be difficulty in folding the arm at the closest point should be considered.
2. Confirm the workpiece movement path
From unloading to unloading, the workpiece may need to go around, lift, rotate or wait for positioning. The job radius should cover the complete path, not just the start and end points. For large-sized workpieces, the sweep space of the workpiece shape must also be considered.
3. Confirm interference with equipment, personnel, columns, shelves, and conveyor lines
Machine tool doors, protective covers, conveyor lines, material frames, shelves, columns, walls, pipelines, personnel passages, etc. should be inspected on site. When the working radius is too large, the fixture and workpiece may enter undesirable areas. If necessary, mechanical limits should be set or the installation position should be adjusted.
4. Confirm the load weight and fixture’s own weight
The load includes not only the weight of the workpiece, but also the weight of the clamps, suction cup holders, cylinders, rotating mechanisms, handles and connections. The greater the load and the longer the radius, the higher the requirements for structural rigidity and balance system. You cannot select based only on the weight of the workpiece and ignore the weight of the fixture.
5. Confirm the lifting stroke and operating position
Operators need to complete picking, moving and unloading materials in a safe and comfortable position: if the arm length is too short, the operator may need to lean over to operate; if the arm length is too long, the equipment may go around too much and the operating feel will deteriorate. A reasonable plan should allow personnel to stand stably, have clear lines of sight, and have smooth operating routes.
6. Leave an appropriate safety margin
A certain safety margin usually needs to be reserved for the operating radius, but the larger the margin, the better. Appropriate space can be reserved based on on-site errors, workpiece placement deviations, fixture length and operation avoidance requirements: if the reservation is too small, it will be out of reach, and if the reservation is too large, it may cause structural and safety problems.
05Simple estimation example
Assuming that the horizontal distance from the material pick-up point to the material discharge point of a certain station is 2.4m, initially it seems that the working radius of 2.4m is sufficient. However, when actually confirming, we must also consider: the pick and place points are not necessarily located at the ideal positions on both sides of the rotation center; the clamp needs to avoid the edge of the material frame and the conveyor line guardrail; the operator needs a certain standing space; there is a position deviation of 100–200 mm in the placement of the workpiece; the end of the clamp may also need to be rotated or fine-tuned.
Therefore, it can be estimated according to the following thinking: the basic horizontal distance is 2.4m, plus the operation avoidance of 0.2m, plus the workpiece placement deviation of 0.1–0.2m, plus the safety margin of 0.2m, and an effective operating radius of about 2.9–3.0m can be initially considered. But this does not mean that you must choose an arm length of 3.5m or longer - if the site has passages, columns, machine tool housings or adjacent workstations beyond 3.0m, an excessively long radius will increase interference. The final determination should be based on the installation point position, rotation angle, tooling length and actual movement path.
06The impact of common installation methods on working radius
- Column type: The installation position is relatively fixed, suitable for single station or adjacent station transportation. The radius is mainly affected by the position of the column, the fixing conditions of the base and the rotation range: if it is placed too far, the radius will become larger, and if it is placed too close, it may interfere with the workpiece and personnel.
- Mobile: It has high flexibility, but the flatness of the ground, the stability of the mobile base and the reliability of braking must be considered. It is not advisable to simply extend the arm span to cover more areas.
- Overhead-mounted: Suitable for workstations where ground space is tight or where overhead coverage is required, but the load-bearing capacity of factory beams, steel structures or hanging foundations must be confirmed, and top pipelines, lighting, and bridges must be considered.
- Rail-mounted: Expanding the coverage through the track can reduce the problems caused by too long single arm. Multi-station continuous handling is often more reasonable than super-long arms, but it is necessary to confirm the track length, hanging points, pulley resistance and end limits.
- Cantilever crane / folding arm cantilever crane: Suitable for rotary handling within a certain range, covering a large area, but attention should be paid to the radius of rotation, lifting points, clamp swing and peripheral interference.
07Examples of typical scenarios
- Machine tool loading and unloading: The radius should cover the material frame, machine tool door and clamping position, while avoiding the machine tool shell and operation panel. If it is too long, it will affect the positioning feel. If it is too short, the person will need to lean over to place the parts.
- Carton Handling: The range of pick and place points is large and the cycle time is fast. Pay attention to the ease of operation and rotational inertia. When covering multiple pallet positions, consider rail-type or rationally arrange the columns instead of blindly lengthening a single arm.
- Auto parts assembly: It has high requirements for posture, positioning and collision prevention. The radius needs to be coordinated with the flipping, rotating and positioning actions of the fixture to avoid interference between parts and the body, tooling or personnel.
- Panel handling: The size of the workpiece is large and the sweep range is large. Even if the weight is not high, the safe space of the corners of the plate during rotation must be considered; the length of the vacuum lifting fixture will also affect the actual radius.
- Roller workpiece transfer: It may be necessary to horizontally lift, flip or align the axis. The radius should ensure that the clamp can stably approach the center of gravity of the workpiece and leave enough space for fine adjustment when unloading.
08Working radius on-site confirmation form
| Confirm items | On-site data required | Judgment explanation |
|---|---|---|
| Pick-up point location | Coordinates of picking point, material frame size, picking height | Determine whether the equipment can successfully approach the workpiece |
| Discharging point position | Coordinates of unloading point, equipment/tool size, unloading height | Determine the maximum effective operating range |
| Horizontal handling distance | Horizontal distance of pick and place points, installation center position | Preliminary estimate of working radius |
| Workpiece parameters | Weight, dimensions, center of gravity, surface condition | Determine the load moment and fixture form |
| Fixture parameters | tooling self-weight, length, opening and closing method, rotation requirements | Determine terminal extension and operating space |
| moving path | Whether it is a straight line, whether it goes around, whether it needs to be flipped | Determine actual coverage and risk of interference |
| surrounding obstacles | Positions of columns, shelves, machine tools, conveyor lines, and guardrails | Determine whether it is necessary to limit the position or adjust the layout |
| Operating position | Personnel standing position, line of sight, passage width | Determine operating comfort and safe space |
| Lifting Stroke | Pick and place height difference, obstacle clearance height, tooling height | Determine whether the lifting stroke matches |
| safety margin | Placement error, avoidance space, maintenance space | Determine whether the radius needs to be appropriately reserved |
09What on-site information is provided by the customer so that the manufacturer can accurately select the model
To accurately complete the selection of Pneumatic Industrial Manipulator and confirmation of custom-configured Pneumatic Industrial Manipulator, it is recommended that customers provide complete on-site information as much as possible, including: site plan, equipment installation location, coordinates of pick-up and discharge points, pick-and-place point height, workpiece weight, workpiece size, workpiece center of gravity, surface condition, handling rhythm, daily working frequency, clamping method requirements, whether flipping or rotation is required, surrounding obstacle locations, personnel access, compressed-air supply conditions and safety requirements.
If complete drawings are not available, on-site photos, videos, hand-drawn dimensional drawings and key measurement data can also be provided. For complex workstations, it is best to indicate the opening range of the machine door, the height of the conveyor line, the size of the material frame, the position of the shelf, the distance between columns or walls, etc. The more complete the information, the easier it is for manufacturers to determine how to choose the handling radius and avoid plans that are too short, too long, or late intervention.