Introduction
In multi-head weighers, especially when weighing hardware products, prolonged operation can cause hopper deformation. This deformation often leads to the hopper door switch becoming unresponsive, stuck, or jamming materials inside. Such issues cause inaccurate weighing results and require hopper adjustment for normal operation.
As a professional manufacturer of combination scale hoppers, we provide detailed maintenance instructions to help you solve these common problems effectively.
Step-by-Step Maintenance and Adjustment Procedure
1. Remove Hopper Door and Actuator Linkage
- Dismantle the hopper door and the connecting linkage rod.
- This allows inspection of the actuator arm and hopper door independently for any malfunction.
2. Inspect the Actuator Arm
- Check if the actuator arm moves smoothly and flexibly.
- If it’s stuck or jammed, clean and lubricate it.
- Replace the actuator arm if it is damaged.
3. Check Hopper Door Movement
- Manually test the hopper door’s opening and closing actions.
- If the door is stuck:
- Remove the linkage rod.
- Identify which side of the door is causing the obstruction.
4. Adjust the Stuck Hopper Door
- Remove the stuck side hopper door.
- Adjust both sides to ensure the two doors are parallel.
- This adjustment is critical for smooth operation.
5. Reassemble Hopper Door and Test
- Reinstall the hopper door.
- Verify there is no sticking.
- The hopper door should move freely without obstruction.
6. Reinstall the Linkage Rod
- Attach the linkage rod back to the hopper door assembly.
7. Adjust Eccentric Screws on Hopper Door
- Adjust the eccentric screws on the hopper door to minimize the gap between the two doors.
8. Secure Screws on Fork and Hopper Door
- Tighten the screws on both the actuator fork and the hopper door to lock the adjustment.
9. Ensure Door Operates Smoothly After Tightening
- Open and close the hopper door several times to confirm smooth operation.
10. Adjust Eccentric Screws for Door Self-locking
- If the door opens too easily and cannot self-lock:
- Adjust the eccentric screws on the actuator fork until the door can self-lock.
- Then tighten these screws securely.
Summary
- Regular inspection and precise adjustment of the hopper door and actuator arm ensure that the multi-head weigher operates accurately and efficiently.
- Deformation and wear after long-term operation are common but manageable with routine maintenance.
Suggested Diagram Descriptions for Visual Aids
| Diagram Number | Description |
|---|---|
| Diagram 1 | Hopper Door Assembly Overview — labeled parts including hopper door, actuator fork, linkage rod, eccentric screws. |
| Diagram 2 | Removing Hopper Door and Linkage Rod — illustrating the dismantling process. |
| Diagram 3 | Adjusting Hopper Door Parallelism — showing how to align two hopper doors side-by-side. |
| Diagram 4 | Eccentric Screw Adjustment — visualizing screw locations and turning direction to reduce door gaps and achieve self-locking. |
| Diagram 5 | Final Assembly and Testing — demonstrating reassembly and manual testing for smooth operation. |
