Technical Field
The utility model discloses an adjustable-gap traction device for corrugated plastic sheets, belonging to the field of plastic machinery. In the production of corrugated plastic sheets using powder raw materials, the device is used to precisely adjust the clearance between traction rollers and pressing rollers of the traction device, so as to ensure the thickness of corrugated plastic sheets after traction meets technical requirements.
Background Art
At present, the traction clearance adjustment for corrugated plastic sheet production adopts the limit screw adjustment mode. One set of supporting screw and nut is arranged below each end of the pressing roller. During clearance adjustment, tools are used to rotate the screw and control the extending height of the screw out of the nut to limit the descending position of the pressing roller, so as to indirectly guarantee the traction thickness of corrugated sheets.However, the maximum screwing length between the nut and the screw is equal to the thickness of the nut, which restricts the maximum adjustable clearance range to the nut thickness. When a relatively large clearance is required, the screw extends far out of the nut, resulting in a short screwing engagement length. This may cause thread damage of the screw and nut. In addition, a tool kit must be prepared for adjustment operation.In view of the current development of corrugated plastic sheet manufacturing machinery, there is an urgent demand for an adjustable-gap traction device featuring fast and high-precision traction clearance adjustment and convenient operation.
Contents of the Utility Model
The objective of the utility model is to provide an adjustable-gap traction device for corrugated plastic sheets to overcome the deficiencies of existing corrugated plastic sheet manufacturing equipment. The device realizes fast, high-precision clearance adjustment with easy operation.
The technical solution is described as follows. The device comprises a traction frame, traction roller assemblies, idle gears, transmission gears, a driving device, driving gears and pressing roller assemblies.The traction frame adopts a six-sided box structure. One side panel defined by the longest edge and medium-length edge of the box is placed on the ground.A plurality of rectangular grooves are evenly arranged along the long edge on the side away from the ground on each of the two lateral side panels defined by the longest edge and shortest edge of the box. The quantity of rectangular grooves is an odd number. The length direction of each rectangular groove is perpendicular to the long edge of the side panel, and the rectangular grooves on the two lateral panels correspond one-to-one.Long grooves are arranged along the long edge close to the rectangular grooves on each of the two end side panels defined by the medium-length edge and shortest edge of the box. The length direction of each long groove is parallel to the long edge of the side panel, and the long grooves on the two end panels lie on the same plane. Protective covers are symmetrically arranged on both sides of the long groove on one end side panel equipped with long grooves.
Each traction roller assembly includes a traction roller and a drive wheel. Traction rollers with the same quantity as the rectangular grooves are supported at both ends on the two lateral side panels of the traction frame provided with rectangular grooves. Each traction roller is positioned at the side of the rectangular groove away from the upper longest long edge of the box, and the axes of all traction rollers lie on the same plane.One drive wheel is installed on the outward extending end of each traction roller passing through the side panel of the traction frame in the same direction. An idle gear is arranged between the drive wheels of every two adjacent traction rollers, and each idle gear meshes with both adjacent drive wheels simultaneously.The middle drive wheel meshes with the transmission gear. The driving device is mounted on the base plate of the traction frame, and the driving gear fitted on the output shaft of the driving device meshes with the transmission gear.
Each pressing roller assembly includes a pressing roller, T-shaped supports and pressing roller cylinders. Two T-shaped supports are installed at both ends of each pressing roller through round holes on their T-shaped planes. Assemblies composed of pressing rollers and T-shaped supports (in the same quantity as traction roller assemblies) are clamped between the long sides of the rectangular grooves on the two lateral side panels of the traction frame via sliding grooves on both sides of the T-shaped supports at both ends of each pressing roller.Each pressing roller cylinder comprises a cylinder body, a telescopic rod, an adjusting nut and a locking nut. One end of the cylinder body of each pressing roller cylinder (twice the quantity of traction roller assemblies) is correspondingly mounted above each rectangular groove of the traction frame. The extending end of the telescopic rod of each pressing roller cylinder toward the T-shaped support is installed in the round hole at the tail of the T-shaped leg of each T-shaped support. The threaded tail end of each telescopic rod away from the T-shaped support is fitted with an adjusting nut and a locking nut.
On the basis of the prior art, the traction frame adopts a six-sided box structure. One side panel defined by the longest edge and medium-length edge of the box is placed on the ground.A plurality of rectangular grooves with an odd total quantity are evenly arranged along the long edge away from the ground on each of the two lateral side panels defined by the longest edge and shortest edge of the box. The length direction of each rectangular groove is perpendicular to the long edge of the side panel, and rectangular grooves on the two lateral panels correspond one-to-one.Long grooves are arranged along the long edge close to the rectangular grooves on each of the two end side panels defined by the medium-length edge and shortest edge of the box. The length direction of each long groove is parallel to the long edge of the side panel, and the long grooves on the two end panels are coplanar. Protective covers are symmetrically arranged on both sides of the long groove on one end panel.
Traction rollers equal in quantity to the rectangular grooves are supported on the two lateral side panels with rectangular grooves. Each traction roller is located at the side of the rectangular groove away from the upper longest edge of the box, and all traction roller axes are coplanar.A drive wheel is mounted on the outward end of each traction roller penetrating the frame side panel. An idle gear is arranged between every two adjacent drive wheels and meshes with both simultaneously. The middle drive wheel meshes with the transmission gear. The driving device is installed on the frame base plate, and the driving gear on its output shaft meshes with the transmission gear.
Two T-shaped supports are fixed at both ends of each pressing roller via round holes on the T-shaped planes. Combinations of pressing rollers and T-shaped supports are clamped between long edges of rectangular grooves on the lateral frame panels through sliding grooves on the T-shaped supports.One end of each pressing roller cylinder body is installed above each rectangular groove. The extending end of each telescopic rod toward the T-shaped support is mounted in the round hole on the T-shaped leg. The threaded tail of each telescopic rod away from the T-shaped support is equipped with an adjusting nut and a locking nut.
Working Principle
During equipment commissioning or product changeover for corrugated sheets of different thicknesses, the clearance between traction rollers and pressing rollers needs to be adjusted. The adjustment steps are as follows:A. Calculate the thickness difference ΔBc between target sheet thickness Bt and current sheet thickness Bd:ΔBc=Bt−Bd;B. Calculate the rotation angle Δθt of the adjusting nut according to the thread pitch St of the adjusting nut:Δθt=2πΔBc/St=2π(Bt−Bd)/St;C. Determine the rotation direction of the adjusting nut: the adjusting nut adopts right-hand thread. Viewed from top to bottom, rotate counterclockwise if ΔBc＜0; rotate clockwise if ΔBc＞0;D. Loosen the locking nut, rotate the adjusting nut to the calculated angle, then retighten the locking nut.
Extruded sheets subjected to vacuum shaping are fed into the adjustable-gap traction device through the long groove on the protective cover side of the traction frame and guided out from the long groove on the opposite side.The telescopic rods of the pressing roller cylinders extend and push the pressing rollers toward the traction rollers via T-shaped supports, ensuring the clearance between rollers (namely the sheet thickness after traction) meets requirements.Start the driving device. It drives each drive wheel to rotate through the driving gear, transmission gear and idle gears. The traction rollers pull corrugated sheets with qualified thickness forward.
Compared with existing equipment in the industry, the utility model has the following advantages:The threaded tail of each telescopic rod of the pressing roller cylinder is equipped with an adjusting nut locked by a locking nut, which enables precise adjustment of the clearance between pressing rollers and traction rollers and guarantees qualified corrugated sheet thickness.Multiple groups of traction roller assemblies and pressing roller assemblies are arranged, which provides sufficient traction force without tearing corrugated sheets caused by excessive traction of a single set.The alternating layout of drive wheels and idle gears ensures synchronous operation of all traction rollers all the time.
