CN-121990423-A - Pneumatic propping structure of pay-off rack

CN121990423ACN 121990423 ACN121990423 ACN 121990423ACN-121990423-A

Abstract

The invention provides a pneumatic jacking structure of a pay-off rack, which comprises a shaft body, a movable sleeve, an air cylinder, a push rod, a tension spring, a tension head, a tension block, a movable head and a connecting rod mechanism, wherein the movable distance d=d1+d2 of an air cylinder piston rod is realized through the superposition design of the deformation quantity of the tension spring and the movable distance of a limiting end surface. Compared with the stroke requirement of the traditional small-stroke cylinder, the effective stroke of the cylinder in the structure is prolonged to the sum of d1 and d2, the stroke length is completely matched with the cylinder with the conventional specification on the market, the small-sized high-precision cylinder is not required to be customized, the manufacturing cost and the purchasing cost of equipment are obviously reduced, and the large-scale popularization and application are facilitated.

Inventors

HE BANGQING
CHEN LIKUN
He Bangshuang
Fang Kunrong
HU JINXIN

Assignees

广州市鸿辉电工机械有限公司

Dates

Publication Date: 20260508
Application Date: 20260326

Claims (10)

1. The pneumatic propping structure of the pay-off rack is characterized by comprising a first propping unit, a first pushing unit, a second pushing unit and a connecting rod mechanism, wherein the first pushing unit is connected with the shaft in a sliding mode, the second pushing unit is connected with the shaft in a sliding mode, the push rod is connected with the inside of the shaft in a sliding mode and driven by an air cylinder, the first pushing unit is fixedly connected with the end face of the shaft and the inner end face of the first pushing unit, the second pushing unit is fixedly connected with tension springs, the two ends of the tension springs are fixedly connected with the end face of the shaft and the inner end face of the first pushing unit respectively, and the connecting rod mechanism is arranged at the end of the push rod and used for connecting the moving head and the first pushing unit; When the limiting end face of the moving head is separated from the end face of the tensioning head, the tension spring is stressed and stretched, and the tensioning block rotates to be loosened; When the limiting end face of the moving head abuts against the end face of the tensioning head, the limiting end face limits the rotation of the tensioning block to achieve tensioning, in the process, the tension spring is retracted, the moving distance d=d1+d2 of the piston rod in the cylinder, d1 is the deformation of the tension spring, and d2 is the moving distance of the limiting end face.
2. The pneumatic jacking structure of the pay-off rack according to claim 1, wherein the shaft body is connected with a rotating sleeve through a first bearing, one end, away from the tensioning head, of the rotating sleeve is fixedly connected with a rotating disc driven by a rotating mechanism, the rotating disc and the pay-off rack synchronously rotate, the moving sleeve is connected with the rotating sleeve in a sliding mode, a synchronous rotating assembly is arranged between the moving sleeve and the rotating sleeve, the synchronous rotating assembly is used for limiting the moving sleeve to move in a preset length interval, and the moving head is connected with the end portion of the push rod in a rotating mode through a second bearing.
3. The pneumatic jacking structure of the pay-off rack according to claim 2, wherein the end part of the rotating sleeve is in threaded connection with a bottom cover, one end of the bottom cover is tightly pressed against the outer ring of the first bearing, one end of the bottom cover, which is away from the first bearing, is provided with a limit column, the tension spring is sleeved outside the limit column, and one end of the tension spring is fixedly connected to the bottom cover.
4. A pneumatic jacking structure of a pay-off rack according to claim 3, wherein a plurality of adjusting plates are arranged between the bottom cover and the tension spring, threaded holes are formed in the bottom cover, through holes aligned with the threaded holes are formed in the adjusting plates, a compression bolt is sleeved on a screw sleeve and penetrates through the through holes to be in threaded connection with the threaded holes, the compression bolt is inserted between two elastic rings of the tension spring, and when the compression bolt is screwed down, the compression bolt compresses the elastic ring at the bottommost part of the tension spring on the adjusting plates.
5. The pneumatic jacking structure of the pay-off rack according to claim 2, further comprising a fixing frame, wherein a fixing plate is arranged on the fixing frame, the cylinder is fixedly connected to the fixing plate, and the shaft body is fixedly connected to the fixing plate.
6. The pneumatic jacking structure of a pay-off rack according to claim 5, further comprising a second jacking unit which is identical to the first jacking unit in structure, wherein the first jacking unit and the second jacking unit are symmetrically distributed about the fixing plate, the fixing plate is in a cross shape, the four ends of the fixing plate are fixedly connected with one cylinder, the directions of piston rods of the two symmetrically distributed cylinders are identical, one end of each shaft body, which is close to the fixing plate, is provided with two notches, each piston rod is fixedly connected with a connecting rod, each connecting rod penetrates through each notch and is fixedly connected with the corresponding pushing rod, and the width dimension h of each notch is more than 1.5d.
7. The pneumatic jacking structure of the pay-off rack according to claim 2, wherein a positioning hole is formed in the pay-off rack, and a rotating rod matched with the positioning hole is fixedly connected to one side, close to the tensioning head, of the rotating disc.
8. The pneumatic jack structure of claim 1, wherein the link mechanism includes a link with one end rotatably connected to the moving head and the other end rotatably connected to the tensioning block, and the moving head drives the tensioning block to rotate via the link.
9. The pneumatic jacking structure of the pay-off rack according to claim 1, wherein a plurality of notches are formed in the tensioning head, the tensioning block is located inside the notches, the width dimension of one end face of the tensioning block, which is close to the moving head, is larger than the width dimension of the notches along the axis, an extrusion surface is arranged on the tensioning block, and when the length of the tension spring stretched under stress reaches a preset threshold value, the extrusion surface is in pressure connection with the notches.
10. The pneumatic jacking structure of the pay-off rack according to claim 1, wherein a plurality of positioning rods are arranged in the moving head, annular grooves are formed in the push rods, a plurality of balls are embedded in the side walls of the positioning rods, which are positioned in the annular grooves, and the spherical surfaces of the balls are abutted against the inner walls of the annular grooves.

Description

Pneumatic propping structure of pay-off rack Technical Field The invention relates to the technical field of inflatable shafts, in particular to a pneumatic jacking structure of a pay-off rack. Background The inflatable shaft is used as a B65H structure for carrying the filament-shaped materials and can be applied to a pay-off rack for carrying out pay-off and take-up operations, the inflatable shaft of the B65H structure is used for stably positioning the pay-off rack through an inflatable structure and then rotating the pay-off and take-up, and the inflatable design of the B65H structure in the process ensures the stability of the pay-off and take-up process, so that the stable carrying of the filament-shaped materials in the pay-off rack is ensured. In the prior art, a typical inflatable shaft structure generally comprises a shaft body, a plurality of supporting pieces are connected to the end part of the shaft body in a circumferential rotation mode, a push rod capable of axially moving is arranged in the shaft body, and the push rod is in transmission connection with each supporting piece through a connecting rod assembly. During operation, the push rod is driven to axially move along the shaft body, the opening member is driven to overturn around the rotating connection point by means of the transmission effect of the connecting rod assembly, one end of the opening member, which is far away from the shaft body, is opened outwards, and accordingly tensioning and positioning of the pay-off rack sleeved on the excircle of the inflatable shaft are achieved. In the push rod driving structure of the air expansion shaft, the cylinder pushing is widely adopted due to high response speed and simple structure, but in a small pay-off rack scene, the corresponding air expansion shaft specification is reduced due to the small size of the pay-off rack, the required axial movement stroke of the push rod is small, and at the moment, the following technical defects exist if the mode of pushing by the standard cylinder is still adopted: Firstly, the air pressure transmission efficiency is low, and the ejection force output is insufficient and unstable. The small stroke cylinder has smaller cylinder diameter and limited corresponding air pressure acting cavity volume, so that the air pressure is easy to generate pressure loss and fluctuation in the transmission process. When the air pressure of the air source slightly fluctuates, the output force of the small-stroke air cylinder can be obviously changed, and stable jacking force cannot be formed, so that the paying-off precision is affected. Secondly, the adaptability of the low-pressure working condition is poor, and the application range of the equipment is limited. In some remote production scenarios or under conditions where the air pressure supply is unstable, the air pressure of the air source may be below nominal. The small-stroke cylinder has low air pressure action efficiency and extremely high sensitivity to air pressure change, when the air pressure is lower than a critical value, the output force of the small-stroke cylinder can be rapidly reduced, the jacking action can not be completed, and if the suitability of the low air pressure working condition is improved, the air source pressure is forcedly increased, the air cylinder sealing element can bear excessive pressure, abrasion is accelerated, air leakage faults are caused, and the reliability and the service life of equipment are further reduced. Third, the customization cost is high. If the small stroke requirement of the small pay-off rack is met, the customized small and high-precision air cylinder is adopted, so that the manufacturing cost of the equipment can be greatly increased, and the large-scale application is not facilitated. Therefore, a pneumatic jacking structure with low cost and adaptive to a small pay-off rack is needed, and the problem of unstable tensioning of a small-stroke cylinder drive is solved. Disclosure of Invention The present invention aims to provide a pneumatic tightening structure of a pay-off rack, which at least has one of the above disadvantages. The pneumatic propping structure comprises a first propping unit, a moving sleeve, a push rod, a tension spring, a tension block, a connecting rod mechanism and a connecting rod mechanism, wherein the first propping unit comprises a shaft body, the moving sleeve is in sliding connection with the shaft body, the push rod is in sliding connection with the inside of the shaft body and is driven by an air cylinder, the tension head is fixedly connected to the end part of the moving sleeve, the tension spring is fixedly connected with the end surface of the shaft body and the inner end surface of the tension head at two ends respectively, the tension block is rotatably connected to the tension head, the moving head is arranged at the end part of the push rod and is used for connecting the moving head and the tension block, and the c