A paper mill wire section shake box drives the bronze wire or forming fabric in a small reciprocating shake to improve fiber formation. Internal assembly follows the sequence of power input, transmission amplification, shaking motion, and positioning and fixing. Core components include the eccentric drive unit, shake frame body, bearing pairs, seals, and locating fasteners. Assembly accuracy directly affects shake amplitude stability and equipment life.
1. Internal assembly details of core components
(1) Eccentric drive mechanism
Hot-fit the eccentric shaft bearing
Heat the self-aligning roller bearing to 80-120°C. Do not use an open flame. Use an oil bath or induction heating. Press it quickly onto the eccentric shaft journal. After cooling, measure the radial runout of the journal, which should be ≤0.03 mm.
Fix the eccentric wheel
Connect the eccentric wheel to the eccentric shaft with a flat key. Control the keyway fit clearance to 0.01-0.02 mm. Tighten the shaft end lock nut, then fit a stop washer to lock it and prevent loosening during operation.
Couple the drive
Connect the eccentric shaft to the external drive motor through an elastic pin coupling. Keep the coaxiality of the two shafts ≤0.05 mm to avoid additional radial load during operation.
(2) Shake frame body and support structure
Prepare the shake frame body
The shake frame body is welded from Q235 steel plate. Add 3-5 reinforcing ribs inside to prevent deformation under heavy load. The geometric tolerance of the machined lug mounting holes should be ≤0.05 mm. For shake frames, lugs, guide sliders, and similar parts, we can machine to customer drawings, for single pieces or small batches.
Hinge the shake frame to the eccentric wheel
Hinge the lugs of the shake frame body to the eccentric wheel through sliding bearings. Use an H7/h6 transition fit between the bearing and the lug. After pressing, check the fit clearance between the lug and the eccentric wheel, which should be ≤0.02 mm.
Install the guide pair
Fix the sliding guide on the shake box base support. Use a clearance fit between the slider at the bottom of the shake frame and the guide, with clearance controlled at 0.1-0.2 mm, so the reciprocating shake runs without binding.
Set stroke limits
Install stops at both ends of the shake frame stroke. Set the shake stroke to 10-30 mm according to the paper machine width, to prevent overtravel damage to drive parts.
(3) Sealing and protection components
Install shaft end seals
Fit skeleton oil seals at both shaft extensions of the eccentric shaft. Apply No. 00 lithium grease to the lip. Keep the interference between the lip and the journal at 0.1-0.2 mm to prevent pulp and cooling water from entering the drive cavity.
Add dust scraper
Install a polyurethane dust scraper on the sliding fit surface between the shake frame and the guide to block pulp fibers from entering the guide clearance.
Seal box joints
Seal the joint between the shake frame and the external box with water-resistant sealant to prevent media from entering the internal structure.
2. Checks and adjustment after assembly
Manual turning check
Turn the eccentric shaft and confirm there is no binding or abnormal noise in the drive mechanism. The shake amplitude deviation should be ≤±1 mm.
No-load running test
Run continuously without load for 30 minutes. Check that the bearing operating temperature is ≤60°C and the overall vibration acceleration is ≤2.8 m/s², in accordance with GB/T 11347-2019, Mechanical vibration, Measurement and evaluation of vibration of rotating and reciprocating machines.
Load test
After connecting the paper machine wire section load, adjust the eccentric wheel phase to match the shake frequency with the paper machine running speed. Add the specified grease to replenish lubrication of the drive pair.
Beyond shake box parts, our precision component machining capability also covers non-standard parts for papermaking machinery, tobacco packaging machinery, filling machinery, and printing machinery, as well as precision structural parts for yachts and RC race cars. Hansheng Automation machines single pieces or small batches to customer drawings, with material, tolerance, and surface finish specified by the drawing.
