CN115367564A - Mechanical expansion shaft with round nut spring ring - Google Patents

Abstract

The invention discloses a mechanical expansion and contraction shaft of a round nut spring ring, which is suitable for narrowing the width of metal foil and is suitable for high-end aluminum foil, electromagnetic foil, hand-tearing steel foil and solar film. Aiming at the problems of air leakage of a capsule, large radial run-out of a shaft, low bending strength, small external expansion force, intermittent slipping of a drum pipe and the like of the conventional air bag and a specific mechanical shaft, the novel structure expansion shaft consisting of three mechanisms is provided. Under the action of the primary pushing force of the rotation of the round nut and the secondary pushing force amplifying mechanism of the spring ring/conical surface machinery, over three tons of external expansion clamping force can be generated. After the winding drum is expanded outside the pipe, all fit gaps in the shaft can disappear automatically, so that the radial runout precision of the shaft is improved, and the bending resistance of the shaft in the suspended shaft drawing and the hanging winding is improved. The shaft diameter adjusting mechanism before the shaft expands can make the shaft have multiple purposes. The cross screwing of the double-hook spanner can improve the external expansion force of the shaft by 50 percent, and the shaft of the invention has small diameter and no inflatable capsule, and can replace the shaft for a thick and thin shearing machine.

Description

Mechanical expansion shaft with round nut spring ring

Technical Field

The invention relates to a mechanical expansion and contraction shaft for a round nut spring ring, and belongs to the field of tool manufacturing of coiled material take-up shafts such as metal foils, high-end electromagnetic foils, hand-tearing steel foils and solar films.

Background

The original large rolls of metal foil, non-metal cloth and paper with large diameter and wide breadth are rolled and cut into small roll products with different widths. The procedure is that the reel tube with the same width as the small roll product is threaded on the main body shafts with respective clamping modes to be expanded, then uncoiled and flattened, the surface material is adhered on the reel tube, and the width of the reel tube is narrowed by the cutting of the blade through the rotation of the shafts.

The main technical requirements for the take-up shaft are: the drum pipe is tightly clamped and expanded on the shaft without slipping; the requirement on the radial runout precision of the shaft is high; the space between the coiling drum pipes is adjustable, and the operation is required to be convenient and fast.

The width of the foil coil is narrowed and the coil is taken the axle, the earliest is that hook spanner pulls the round nut, the round nut axial is the structure of the reel pipe clip firmly, the advantage is that the intensity of axle is high. The main problem is that the inner diameter of the winding drum pipe has a fit clearance with the outer diameter of the mandrel, so that the radial run-out precision is not high. Due to the axial clamping, when the positions of the coiling drum pipe and the central line of the original large coil are adjusted, pipe heads and round nuts with different lengths are frequently disassembled, so that time and labor are wasted. And the end surface of the winding drum pipe can not be cut according to the process dimension required by a user.

The most adopted shafts in the industry at present are: the inflatable bag structure type expansion shaft has the main advantages that the distance between the winding drum pipes can be adjusted due to radial expansion, a hook and a spanner are not needed, the operation is convenient, and the inflatable bag structure type expansion shaft is popular with operators. The main problems exist in that a reel pipe 16 penetrates through a shaft surface with a plurality of long grooves as shown in figure 5, the fit clearance between the inner diameter of the reel pipe 16 and the outer diameter of a mandrel metal is about 0.5-2mm, an inflating bag 18 and a rubber expansion strip 17 which are arranged in the grooves are both elastic substances, the reel pipe is inflated into the air bag for the purpose of not slipping, the reel pipe and the mandrel form a non-rigid whole, and as shown in figure 5, the large fit clearance 21 in the prior art has large jumping error. Under the support of the charged compressed air and these elastic substances, the axial lead of the coiled material of the reel pipe is easy to deviate from the axial lead of the expansion shaft under the action of gravity and the asymmetrical external force of the flattening roller in the equipment, especially the large and heavy coiled materials, the external diameter of the coil can generate periodic wave-type jumping during the gradual increase of the coil diameter at high-speed rotation, and the end surface of the coil diameter can generate sawtooth-shaped edges. This problem is not particularly serious in the case of winding cloth or soft paper rolls, but in the case of winding high-end metal foil or hand-tear steel foil, the improvement in production efficiency is impaired.

In order to solve the problem of large radial run-out error of a drum tube of an air bag type expansion shaft and improve the product quality, a German company is provided in the prior art, and an old air bag expansion shaft with the diameter of 150 is improved by the method: the groove, the air bags and the expansion strip structure are kept unchanged, the space occupied by the other five air bags is changed into 84 graphite plates with the inclination of 12 degrees, and the graphite plates are accurately and mechanically positioned on the penetrated winding drum pipe by pushing the graphite plates by one air cylinder. The improvement can obviously improve the jumping precision of the shaft, and is particularly suitable for the coiling production of small rolls of thin foil. However, the problems of insufficient bulging force and slipping of thick foil and wide rewinding are not solved, and the import price is more than 5 times of the market.

Among the domestic prior art, the mechanical type breathing axis that does not have the gasbag has appeared, patent number: 2006200306893 discloses a high-precision curling expansion and contraction shaft, which has the advantages that the external expansion force is obviously improved compared with an air bag shaft, and the problem is that a fit clearance in the shaft cannot disappear by itself after a sleeve is expanded, so that the radial runout precision of the shaft is difficult to improve. In addition, the expansion block can not retract automatically after being expanded, and the defects of difficult coil drawing and excessive wrenching turns of the bevel gear nut exist.

As shown in fig. 5, the design accuracy 19 of the axis and the actual measurement accuracy 20 of the axis in the conventional technique are not equal to each other, and are "accuracies" having no common basis.

In the prior art, particularly in the case of a 75-diameter air bag expansion shaft, in an elongated slot for milling and mounting an air bag, because of the contradiction of high hardness, low cutting speed, low feeding speed and high processing cost, a mandrel is made of 40 carbon structural steel mostly, but is made of high-quality alloy structural steel rarely, and hardening and tempering in heat treatment of individual companies are not performed, so that the tensile strength is low even if the mandrel is made. Except for the shaft heads at the two ends of the shaft, the material and the hardening and tempering hardness of the shaft are not clear from the technical requirements, and the straightness accuracy of the shaft becomes worse and worse in production from the minimum part of the section of the groove, namely the bending point of the suspended coil, and the investigation shows that: the 75-diameter and more than 2 m-long air bag expansion shaft can not meet the quality requirement of high-end metal foil.

Aiming at the defects of the air bag and part of the mechanical expansion shaft, the inventor invents a novel C-shaped ring mechanical expansion shaft. And was granted patent invention in 2014, the patent numbers are: ZL 2012 1 0269325.0. The shaft of the patent makes substantial improvement on the expanding shafts with different structures, and the success point is that the novel shaft obviously enhances the external expanding force of the winding drum pipe, the jumping precision of the shaft diameter is obviously improved, and in the use of several years, along with the development of production to diversity, the main three defects are found to be improved. (1) Because of the axial spacing problem of the exposed C-rings, long spool tubes can be expanded, but not as narrow. (2) And long key grooves are milled on the slender shaft in the radial direction, so that the improvement of the non-straightness accuracy of the shaft is influenced. (3) The screw connection pair 10 between the tapered wedge pipe 8 combination has the advantages that the problem that the diameter of a cylindrical head of a bolt is small, the area of a connecting groove is small, the fault of a sling chain is generated in frequent reciprocating pulling, and the normal operation of production is influenced.

For the three defects of ZL 2012 1 0269325.0, the invention not only makes a thorough improvement to the shaft, but also adds other innovative mechanisms on the shaft which never exist.

Disclosure of Invention

According to the defects in the prior art, the technical problems to be solved by the invention are as follows: provides a mechanical expansion and contraction shaft with a round nut spring ring, which aims to solve the problems.

The invention relates to a mechanical expansion and contraction shaft with a round nut spring ring, which comprises a mandrel, wherein a working end shaft head and a driving end shaft head are respectively fixed at two ends of the mandrel; the front expansion shaft diameter adjusting mechanism comprises a starting point push pipe at the right end and an expansion diameter adjusting pipe, and the starting point push pipe can be pushed leftwards along the shaft by rotating the expansion diameter adjusting pipe; an expansion and contraction mechanism is arranged between the pushing mechanism and the expansion front shaft diameter adjusting mechanism, the expansion and contraction mechanism comprises a plurality of sections of expansion pipes with the same installation direction, a plurality of spring rings and an open pipe arranged on the outer diameter of the expansion pipes, one end of each expansion pipe is provided with a conical surface, the other end of each expansion pipe is provided with an end plane, and the spring rings are arranged between the conical surfaces and the end planes of the adjacent expansion pipes; the opening tube is provided with an opening penetrating through the two ends.

The outward expansion of the spring ring and the open pipe is realized through the axial movement of the conical surface on the spring pipe, thereby completing the outward expansion of the winding drum pipe. When the splitting machine is used, the winding drum pipe can be threaded on the open pipe at the left end of the expansion shaft, and then the expansion shaft is hung between two shaft seats of the splitting machine to be clamped. According to this batch reel pipe and the size of opening pipe fit clearance, revolve the commentaries on classics and twist the pipe of expanding adjustment, start bloated front axle diameter guiding mechanism, promote the starting point and push away the pipe and play the pipe of expanding and remove left, make spring coil and opening pipe preliminary expand outward, and then make reel pipe and opening pipe fit clearance transfer suitable degree. According to the requirement of a user, the space between the reel pipes is adjusted, the hook wrench pulls the round nut, and the pushing mechanism is started. The round nut can rotate to drive the push pipe to move rightwards on the shaft, so that the elastic expansion pipe is driven to move rightwards, and the spring ring arranged on the conical surface is changed into radial movement under the blocking of the adjacent end plane and moves together with the outside account of the opening pipe. High-speed rotation and no-jump cutting are carried out, so that the production task of the expansion shaft is finished with high quality. After the coiling is finished, the round nut is pulled in the opposite direction. The pushing pipe is driven to retreat, so that the retraction capacity of the spring ring is improved, and the opening of the opening pipe is spanned, a plurality of extension springs are arranged, and the mechanical contraction force of the outer diameter is increased, so that the contraction force of the opening pipe for pipe penetrating and coil drawing is further enhanced. The suspended rolling of the shaft is followed, which is a test on whether the bending strength of the expansion shaft can be used for a long time without bending.

The inner diameter of the round nut is connected with the outer diameter of the mandrel through threads, the inner diameter of an extension pipe at the left end of the round nut is matched with a shaft head at the working end, the inner diameter of an extension pipe at the right end is rotationally connected with the outer diameter of a push pipe through a circle of steel balls, annular grooves for putting the steel balls are formed in the inner diameter of the round nut and the outer diameter of the push pipe, and the push pipe is arranged on the mandrel in a sliding mode; the end of the pushing pipe connected with the expansion pipe is also provided with a conical surface, and a spring ring is also arranged between the conical surface of the pushing pipe and the end plane of the adjacent expansion pipe. The inner diameter of the expansion diameter adjusting pipe is connected with the outer diameter of the starting push pipe through threads, the inner diameter of the expansion diameter adjusting pipe is rotationally connected with the outer diameter of the mandrel through a circle of steel balls, a ring groove for putting the steel balls is formed in the inner diameter of the expansion diameter adjusting pipe and the outer diameter of the mandrel, the starting push pipe is arranged on the mandrel in a sliding mode, an end plane is also arranged at one end, connected with the expansion pipe, of the starting push pipe, and a spring ring is also arranged between the end plane of the starting push pipe and the conical surface of the adjacent expansion pipe. Furthermore, guiding and limiting mechanisms are arranged between the pushing pipes and the elastic expansion pipes, between adjacent elastic expansion pipes and between the elastic expansion pipes and the starting point pushing pipe. Specifically, the guiding and limiting mechanism is an I-shaped pull rod; one end of the pushing pipe is provided with a sliding end T-shaped groove, two ends of the elastic expansion pipe are respectively provided with a static end T-shaped groove and a sliding end T-shaped groove, one end of the starting point pushing pipe is provided with a static end T-shaped groove, two ends of an I-shaped pull rod are respectively arranged in the sliding end T-shaped grooves in a sliding mode and fixedly arranged in the static end T-shaped grooves, and the pushing pipe is connected with the elastic expansion pipe, adjacent elastic expansion pipes and the starting point pushing pipe through the I-shaped pull rod. The adjacent pipe fittings can be pushed or pulled through an I-shaped pull rod, and the sliding distance of the I-shaped pull rod in the T-shaped groove of the sliding end is limited by the length of the T-shaped groove of the sliding end.

The elastic expansion pipe is provided with a conical surface (5.2 in figure 2) with 10-30 degrees from a conical end surface (5.1 in figure 2), an annular groove (5.3 in figure 2) with the maximum outer diameter of the conical surface as a starting point and the length of the annular groove being smaller than that of the conical surface, and the wall thickness of the bottom of the annular groove is 1/2-1/8 of that of the elastic expansion pipe. The conical surface exceeds trisection from the end surface of the cone to the other side of the ring groove, an opening with the width of 0.1-3 mm is arranged, a sliding end T-shaped groove (5.4 in figures 2 and 3) is arranged at the position overlapped with the axis of the opening, a static end T-shaped groove (5.5 in figures 2 and 3) is also arranged from an end plane (5.6 in figure 2) along the axis, an inner ring platform (5.7 in figure 2) is arranged by taking half of the wall thickness as a starting point, and the depth of the inner ring platform can accommodate and is larger than the moving distance of the elastic expansion pipe. Under the block of the end plane of the front elastic expansion tube, the spring ring on the conical surface expands while advancing along the turning and grinding precision of the conical surface in the pushing of the conical surface, and under the limitation of the inner diameter of the winding drum tube and the pushing force of the elastic expansion tube, the spring ring at the back is also axially static along with the spring ring at the front, so that the coaxiality of the open tube is kept within a high precision range.

The left end of the starting point push tube is provided with an end plane and a static end T-shaped groove which are the same as those of the elastic expansion tube, and the starting point push tube is connected with the sliding end T-shaped groove at the conical end face of the next elastic expansion tube through an I-shaped pull rod. The rotary expansion diameter adjusting pipe can adjust the size of the outer diameter of the open pipe before expansion. The outer diameter of the round nut is provided with a plurality of grooves which are the same as the working end shaft head and used for being pulled by a hook wrench, the inner diameter of an extension pipe at the left end of the round nut is matched with the working end shaft head, the inner diameter of the extension pipe at the right end is connected with a push pipe through a circle of steel balls, and the round nut and the push pipe can relatively rotate and simultaneously enable the push pipe to move along the shaft. The right end of the pushing pipe is provided with a conical surface and a sliding end T-shaped groove which are the same as those of the spring pipe, and the pushing pipe is connected with a static end T-shaped groove at the conical end surface of the next elastic expansion pipe through an I-shaped pull rod. The I-shaped pull rod is arranged in a T-shaped groove at the sliding end and the static end between the two tubes through the opening of the spring ring, and the production purpose of outward expansion and retraction of the winding drum tube is completed through the axial movement of the conical surface of the spring tube and the outward expansion and retraction of the spring ring and the opening tube.

The mandrel is provided with a positioning bolt, the tail end of the positioning bolt is arranged in the threaded blind hole, and the head end of the positioning bolt penetrates through the open pipe to be matched with the open pipe so as to position the axial position and the circumferential position of the open pipe; the elastic expansion pipe through which the positioning bolt penetrates is provided with a guide elongated slot, and the positioning bolt is positioned in the guide elongated slot. The length of the guide long groove is larger than the axial stroke of the elastic expansion tube. The number of the expansion tubes with the guide long grooves is determined according to the width of the minimum width of the product roll and the length of the expansion shaft.

The section of the spring ring is circular or polygonal, and one side surface of the spring ring can be processed into a plane. The spring ring is provided with an opening, and the distance between the openings is larger than the middle width of the passing I-shaped pull rod; the section diameter of the spring ring is equal to or less than the wall thickness of the elastic expansion tube, and the outer diameter of the spring ring is equal to or less than the inner diameter of the open tube. During installation, a plane of the spring ring is close to the end plane of the expansion tube. The potential energy generated by the spring ring in the processes of twisting and bending makes the spring ring have the elasticity of outward expansion and self-retraction. The spring coil steel wire is cold drawn by a die, and the section size precision of the spring coil steel wire is extremely high in the length of more than thousands of meters. After the spring ring is formed by bending, the bearing is opened and closed between the mandrel pipe and the open pipe, so that the coaxiality and the radial run-out precision of the shaft reach the highest.

The H-shaped pull rod is bilaterally symmetrical, the thickness of the H-shaped pull rod is equal to or smaller than the wall thickness of the elastic expansion pipe, and the middle width of the H-shaped pull rod is smaller than the opening distance of the spring pipe.

The expansion and contraction mechanism of the shaft is equivalent to a typical bevel-to-bevel force amplification combination. The difference is that the conical surface corresponds to an inclined surface, and the opposite surface of the conical surface is not the inclined surface but a circle, which is the section circle of the spring ring. The radial occupied size is small, which is beneficial to increase the sectional area of the mandrel tube and improve the bending strength of the shaft.

The total stroke of the axial movement of the round nut is the sum of the strokes of the right outward expansion and the left retraction of each conical surface and the elastic expansion tube.

And (3) forming the spring ring/cone surface expansion precision: the elastic expansion pipes are arranged in the inner diameter of the opening pipe, and all the elastic expansion guide pipes are connected in series and combined and connected through an I-shaped pull rod. The outward expansion of the spring ring is driven by the tube-by-tube series connection until the spring ring stops after the spring ring is not balanced. The radial coaxiality and run-out accuracy of the formed shaft are mainly related to the machining accuracy of the coils/cones, and not to how much thrust there is from, to what size position the coils are pushed in the inner diameter of the open tube.

The inner diameter of the open pipe is larger than the outer diameter of the elastic expansion pipe combination, the outer diameter of the open pipe is smaller than the minimum inner diameter of the winding drum pipe, and the length of the open pipe is larger than the sum of the lengths of all the elastic expansion pipes connected in series. The outer diameter of the open pipe is provided with more than two through holes matched with the positioning bolts along the axial direction. An opening with the width of 1-5mm penetrating through the two ends is arranged opposite to the through hole, and hook holes for mounting a plurality of extension springs are arranged across the opening. The open pipe positioned by more than one positioning bolt and arranged on the mandrel can only expand and contract in the radial direction but can not move axially and rotate in the radial direction. The outer diameter surface of the open pipe is provided with a plurality of V-shaped grooves with the width of 1-5mm and the depth of 0.2-2mm along the axial direction, so that the clamping force on the reel pipe can be increased, and the clamping force is more firm than the friction expansion of the air bag expansion shaft.

The mode for promoting the expansion and contraction function of the open pipe is as follows: the maximum outer diameter of the open pipe is smaller than the minimum inner diameter of the reel pipe, and a high-elongation steel pipe is preferably used.

In order to further enhance the shrinking function of the expanded open pipe, a plurality of extension springs are arranged at the positions of the hook holes which are arranged on two symmetrical sides of the opening of the open pipe in a crossing mode, and the stretching springs are shrunk to increase the shrinking force of a group of long-term external diameter machines for the open pipe, so that the self shrinking function of the open pipe is weakened due to long-term frequent external expansion, and the difficulty in pipe threading and rolling up is caused by the increase of the external diameter.

The purpose of two circles of steel balls arranged on the shaft is to obtain larger pushing force in the axial direction and to minimize the friction force when the round nut and the expansion adjusting pipe are rotated.

The two ends of the middle thread of the round nut extend out of the pipe head matched with the shaft head of the working end and the outer diameter of the push pipe, which is beneficial to the connection of the two ends of the round nut and the enhancement of the integral bending resistance of the expansion shaft.

The main reason for pulling the round nut by using a hook wrench is as follows:

(1) The structure is simple, the operation is convenient and fast (2), the radial occupied size of the round nut is small, and the increase of the sectional area of the mandrel and the enhancement of the bending resistance of the shaft are facilitated. (3) Compared with the old round nut shaft which needs to disassemble the round nut every roll, the round nut of the shaft has the advantages that the round nut does not need to be disassembled for the whole life, the working efficiency is greatly improved, and the labor intensity is reduced. (4) The number of turns of the shaft-screwing round nut can be controlled within 1-2 turns, and the operation time of the mechanism is shorter than the inflation time of the air bag expansion shaft. (5) If one hook wrench is used, the whole shaft rotates along with the hook wrench in the hook rotation process, so that the improvement of spiral reinforcement is influenced, the other hook wrench hooks the shaft head of the working end, and the two hook wrenches are used for cross wrenching, so that the secondary mechanical external expansion force of the spring ring/the conical surface can be improved by more than 50%.

The invention is characterized in that:

(1) The outer diameter of the original C-shaped ring combination is added with an open pipe which has a through shaft diameter and can only expand and contract radially but cannot move axially and rotate radially. The winding drum pipes with different lengths can be tightly clamped without slipping when being penetrated on the opening pipe, and the sizes of the winding drum pipes can be adjusted.

(2) The opening tube is additionally arranged, the round-head key of the original C-shaped ring is cancelled, and the straightness accuracy of the shaft is improved because the long key groove is not processed on the slender shaft.

(3) The invention cancels the screw connection pair in the original patent of the invention and improves the connection scheme of the I-shaped pull rod and the elastic expansion pipe. One end of a pull rod arranged in a T-shaped groove at the static end of the elastic expansion pipe is fixed along the shape, and the other end of the pull rod is arranged on an I-shaped pull rod in a sliding end groove of the elastic expansion pipe, so that the pull rod can freely slide axially and can continuously resist tension in frequent retreating. The inventor improves the main defects of the three points on the basis of the patent ZL 2012 1 0269325.0, and in order to reduce the manufacturing cost of the shaft, the shaft is multipurpose, and a shaft diameter adjusting mechanism before expansion of the shaft is added. The shaft head and the round nut are pulled by the double-hook wrench, so that the outward expansion clamping force of the shaft to the winding drum pipe is improved.

Compared with the prior art, the invention has the beneficial effects that:

1. the spiral pushing mechanism and the expansion mechanism of the shaft are integrated. The total external account clamping force of the open pipe to the winding drum pipe can approach more than three tons. Compared with the shaft in the prior art, the reel pipe can not slip discontinuously, the quality influence on the surface tension of the foil due to the unevenness of folds can not occur, and the reel pipe can be used for cutting a thin foil and a thick foil into a shaft.

2. The non-inflatable shaft capsule of the invention has the advantages that after the winding drum pipe is expanded, the matching gaps at the positions in the shafts a, b, c and d automatically disappear as shown in figure 6. After the metal and the metal are combined into a whole including the winding drum pipe, the jumping precision and the bending strength of the shaft are improved.

3. The outer diameter of the shaft and the inner diameter of the winding drum pipe are determined according to the requirements of a user splitting machine, and although the difference is not large, the sizes of the winding drum pipe and the winding drum pipe are different. The reel pipe among the prior art wears on the axle, and its fit clearance's size can not adjust, and the user can only rely on the method of changing different diameter of axle to adjust the fit clearance and improve product quality. The shaft is provided with the front expansion shaft diameter adjusting mechanism, so that the shaft with different shaft diameters is removed for users, the production efficiency is greatly improved, the product quality is ensured, the production cost is reduced, and the liquidity is saved.

4. In order to adjust the position of the central line of an original coil, each shaft used in production needs to be repeatedly disassembled by an operator for each shaft in the axial clamping mode of the round nut in the prior art, time and labor are wasted, and the preparation of the plurality of pipe heads is also unfavorable for the safe and civilized production in a workshop. In addition, the relative process dimensions of the reel end face and the reel pipe end face required by the user cannot be processed. Meanwhile, the round nut in the invention can be assembled on the shaft without disassembling, and is matched with the front expansion shaft diameter adjusting mechanism, so that the pulling times of an operating hand are less, the working efficiency is improved, and the labor intensity is reduced.

5. The structural design mainly based on lathe machining pursues high precision and low cost, and in machining, the lathe machining shaft workpiece has high precision and efficiency. The machining of the air bag expansion shaft groove is mainly milling, so that the effective sectional area of the shaft is reduced, and the improvement of the strength of the shaft is influenced. The design idea of the invention is that the characteristics of high surface precision and efficiency of the lathe for machining the revolving body are fully utilized and exerted, the production cost of the shaft is reduced by matching with standard material reprocessing, and the coaxiality and the radial run-out precision of the shaft are improved.

6. In comparison with a balloon inflation shaft of diameter 75, it is believed that: the use of round nut designs is "lagging", which is a "drawback", applicant believes that: what expansion means is used should be considered as benefit. The mechanical expansion and contraction shaft of the round nut/spring ring has the cross section area and the bending strength of the shaft at the bending point of the suspended coil, which are more than 40 percent greater than those of the air bag expansion shaft. And the number of turns of the screwing nut is controlled within 1-2 turns by the front axle diameter adjusting device without frequently disassembling the round nut and the centering pipe head. Thereby reducing the labor intensity of the operator. The round nuts of every two expansion shafts are in positive and negative buckling fit, so that the nuts are tighter and tighter when being rotated, and the problem of air leakage does not exist, which is the advantage of the 'defects' of the round nut shafts.

7. The expansion shaft can be provided with two hook wrenches, a coil with a small diameter can be wrenched by one wrench, and for a shaft with a heavy coil and a high rotating speed requirement, the two hook wrenches can be wrenched in a crossed mode, so that the clamping force can be improved by 50% compared with the clamping force only by one hook wrench.

Drawings

FIG. 1 is a schematic view of the overall construction of the shaft of the present invention;

FIG. 2 is a schematic cross-sectional view of the expander tube in the expansion shaft;

FIG. 3 is a schematic view of the E-direction I-shaped pull rod in FIG. 1 in terms of its configuration and assembly;

FIG. 4 is a schematic view of the installation of the extension spring on the open pipe in the direction A of FIG. 1;

FIG. 5 is a schematic illustration of a prior art air bag expansion and contraction shaft, showing how large the fit clearance is and how large the runout error is;

FIG. 6 is a schematic diagram showing that after the round nut of the present invention is expanded, the fit clearance at each position in the axes a, b, c and d disappears automatically.

In the figure: a working end shaft head 1; a mandrel 2; a round nut 3; pushing the tube 4; a tube 5 is expanded; a conical end face 5.1; 5.2 of conical surface; the ring groove is 5.3; a sliding end T-shaped groove 5.4; a stationary end T-shaped slot 5.5; end planes 5.6; an inner annular platform 5.7; an open tube 6; a spring ring 7; an I-shaped pull rod 8; a positioning bolt 9; a guide elongated slot 10; starting point pushing pipe 11; an expansion adjusting pipe 12; a drive end spindle nose 13; spindle nose set screws 14; steel balls 15; a spool tube 16; glue expansion strips 17; an air-filled bag 18; the design accuracy of the shaft 19; the measured accuracy of the shaft 20; a fitting clearance 21; an extension spring 22; hook plate groove 23.

Detailed Description

The invention is further illustrated by the following specific examples. However, in the description of the present invention, it should be noted that the terms "front end", "rear end", "left and right", "upper", "lower", "horizontal", and the like indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

FIG. 1 is a drawing showing the initial position of the expanding shaft before the barrel tube 16 is expanded, the axial end face position of each tube in the shaft is zero, and the tube is to be expanded. The method comprises the following steps: the working end shaft head 1 and the transmission end shaft head 13 are respectively fixed on the shaft platforms at the left end and the right end of the mandrel 2 by shaft head set screws 14. Three mechanisms are arranged on the outer diameter of the mandrel 2, one mechanism is arranged at the second shaft diameter of the left end shaft of the mandrel 2, and a round nut 3 pushes a pipe 4 to form a spiral pushing mechanism.

From the left end of the inner diameter of the open pipe 6, the I-shaped pull rod 8 is connected with the push pipe 4, the elastic expansion pipe 5 and the starting point push pipe 11 to form a spring ring/conical surface expansion mechanism of the shaft.

The structural dimension and the technical requirements of the shaft heads at the two ends of the expansion shaft are provided by users. Because coiled materials are different, the types of slitting equipment and the structural size of a main shaft clamping shaft seat are different, and therefore the inner inclined plane and the dial structure size of the shaft head of the expansion shaft to be designed are provided by a user. The requirement of shaft manufacturers is that the inner inclined planes of the shaft heads at two ends are the processing reference and the working reference. The drive side stub shaft 13, which cooperates with the spindle 2, is to be noted for an improvement in the bending resistance of the shaft.

The problem to be solved by designing the axle diameter adjusting mechanism before the axle expands is as follows: in the prior art, taking aluminum foil coiling as an example, the inner diameter of a winding drum pipe 16 for coiling the foil coil is mainly 75+3mm, and the outer diameter of the winding drum pipe corresponds to a common coiling shaft is 75-0.5mm. Thus, the maximum fit clearance of the shaft to the spool tube 16 is 3.5mm, and the shaft radial runout clearance of 3.5mm is far from the required runout error of 0.05 based on knowledge of how large fit clearance is for the balloon and other shafts, and to solve this problem, the practical approach is within the 3.5mm size range. Several small fit clearance outside diameter shafts are machined for mating with the mandrel tube 16 in order to reduce this maximum fit clearance of 3.5mm, which necessarily increases the number of shaft purchases.

According to the shaft diameter adjusting mechanism before expansion of the shaft, the combined stroke of the elastic expansion pipe does not exceed the maximum movement range of the long guide groove 10 by adjusting the outer diameter of the expansion shaft, so that the axial advancing and retreating stroke of the round nut 3 is shortest, and the operation efficiency of the shaft is improved.

The use method of the shaft diameter adjusting mechanism before shaft expansion and the position relation with the positioning bolt 9 are as follows: in this starting position, it can be seen that more than two positioning bolts 9 are located in the middle of the guide slots 10 of the expansion tube 5. According to the using method of the attached drawing 1, if the fit clearance between the inner diameter of the winding drum pipe 16 and the open pipe 6 is found to be small, the outer diameter of the open pipe 6 can not be penetrated, or the pushing force is felt to be large after the winding drum pipe is penetrated, in this case, the outer diameter of the open pipe 6 is reduced by rotating the expansion adjusting pipe 12 in the left direction, so that the starting point pushing pipe 11 pulls the expansion pipe combination to retreat towards the right direction of the shaft through the I-shaped pull rod 8, at this time, the outer diameter of the open pipe 6 is retracted along with the expansion adjusting pipe, and the positioning bolt 9 is equivalent to come to the left end face of the guide elongated slot 10. On the contrary, if the fit clearance between the open pipe 6 and the reel pipe 16 is large, the outer diameter of the open pipe 6 is enlarged by rotating the expansion adjusting pipe 12 in the right direction to push the expansion pipe assembly to be pushed to the left end of the shaft by the starting point push pipe 11 through the i-shaped pull rod 8, and at this time, the outer diameter of the open pipe 6 is expanded to be equivalent to the positioning bolt 9 coming to the right end surface of the guide elongated slot 10. The spool tubes 16 are purchased in bulk and the operator does not need to adjust the outside diameter of the shaft each time for each expansion shaft to adjust the intermediate size.

The installation sequence of the spring ring/conical surface expansion and contraction mechanism of the shaft is as follows: as shown in fig. 1, the right end of the mandrel 2 is started, the driving end shaft head 13 is installed in the shaft diameter of the right end of the mandrel 2 and fixed by more than two shaft head set screws 14, after the diameter expansion adjusting pipe 12 is in threaded fit with the starting point push pipe 11, steel balls 15 are thrown in, the sealing bolt is screwed, the two pipes are assembled and installed on the outer diameter of the right side of the mandrel 2, and then the elastic expansion pipe 5, the push pipe 4 and the spring ring 7 on the conical surface of the push pipe are assembled and installed on the outer diameter of the mandrel 2 in sequence from the left end of the mandrel 2.

As shown in fig. 3, an i-shaped pull rod 8 is arranged between the two pipe fittings in the direction E, the open pipe 6 is inserted on the outer diameter of the expansion pipe 5 combination, and a positioning bolt 9 is fastened in the screw hole of the mandrel 2 through a guide long groove 10 of the expansion pipe 5 and a corresponding hole of the open pipe 6 so as to limit the open pipe 6 to expand and contract radially but not to rotate and move axially in the circumferential direction.

The calculation steps and the formula of the external expansion force of the mechanical expansion and contraction shaft of the round nut spring ring are as follows:

according to the length of the hook wrench L and the F added at the end of the rotary handle _O The hand pulling force can calculate the primary amplification of the F rotary screw and the total secondary amplification expansion force of the spring ring/conical surface machine W.

(1) Calculating the force of the rotating screw- -F

F＝2×L/d×Fo

(2) Screw load after calculation of F force- - - -W

Because: f = W x μ π d + t/π d- μ t

So that: w = (π d- μ t/μ π d + t) F

(3) Calculating the secondary mechanical external expansion force of the C-shaped ring/inclined plane- -W total

Wtotal = W/t g (φ + a)

In the formula:

l- -hook wrench length cm

a- -inclination of inclined plane (conical surface)

d- -effective diameter cm of the nut

T- -pitch cm

Fo-turning handle end added hand pulling force

F- -load after spiral

Mu- - - -coefficient of friction is 0.1

Phi- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -friction angle of tg 5 degree of tg 5 DEG 43- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -'

The use process or principle of the embodiment is as follows:

fig. 1 shows the initial position of the tube inside the shaft before the round nut 3, the spring ring 7 and the mechanical expansion and contraction shaft expand the reel tube 16, the tube inside the shaft retracts to be expanded, and the operation is performed.

A winding drum pipe 16 penetrates through the outer diameter of an open pipe 6 from a working end shaft head 1 on the left side of an expansion shaft, then the expansion shaft is hung between two shaft seats on a slitting device, and the shaft heads are clamped for standby through positioning references of inclined planes at two ends in the shaft heads.

The inside diameter of the spool tubes 16 is not the same for each spool tube 16 due to differences in the processing units and lots of the spool tubes 16. According to the size of the fit clearance between the coiling tube 16 and the opening tube 6, the expansion adjusting tube 12 is screwed, the axial position of the starting point pushing tube 11 is adjusted, the axial positions of the elastic expansion tube 5 and the conical surface 5.2 are changed, and the sizes of the spring ring 7 and the outer diameter of the opening tube 6 are also changed. The fit clearance is required to be small, and the shaft is convenient to penetrate through and withdraw.

The size of the space between each spool tube 16 is adjusted according to the user's requirements for the relative sizes of the end surfaces of the rolls and the end surfaces of the spool tubes 16, and according to the spacing of the slitting blades.

According to the thickness, tension requirement and roll diameter of the coiled material, one hook wrench or two hook wrenches are selected, and the thin foil with the small diameter can be obtained by using one hook wrench. Two hook wrenches are used for thick foil and large coil, and the cross wrenching can improve the external expansion force of the spring ring/conical surface elastic expansion mechanism by more than 50%. The hook spanner is matched with a hook plate groove 23 shown in figure 1, the round nut 3 is wrenched, the elastic expansion tube 5 and the conical surface 5.2 are controlled to move axially from tube to tube by pushing the tube 4, the spring ring 7 arranged on the conical surface pushes the open tube 6 to expand the winding drum tube 16 firmly in the radial direction. After the coiling is finished, the round nut 3 is pulled in the opposite direction to drive the pushing tube 4 to retreat, the self contraction function of the spring ring 7 and the cross-opening tube contract the plurality of stretching springs 22 arranged to promote the opening tube 6 to retract automatically. And then suspending and drawing the coil to prepare for the next tube threading standby.

Of course, the foregoing is only a preferred embodiment of the invention and should not be taken as limiting the scope of the embodiments of the invention. The present invention is not limited to the above examples, and equivalent changes and modifications made by those skilled in the art within the spirit and scope of the present invention should be construed as being included in the scope of the present invention.

Claims (10)

1. The utility model provides a round nut spring ring mechanical type axle that expands and contracts, includes mandrel (2), mandrel (2) left end is fixed with work end spindle nose (1) that can supply the hook plate to pull, and the right-hand member is equipped with drive end spindle nose (13), its characterized in that: the mandrel (2) is sequentially provided with a pushing mechanism, an expansion and contraction mechanism and a front expansion shaft diameter adjusting mechanism, the pushing mechanism comprises a round nut (3) and a pushing pipe (4) at the left end, and the round nut (3) rotates to push the pushing pipe (4) to the right along the axial direction;

the front expansion shaft diameter adjusting mechanism comprises a starting point push pipe (11) at the right end and an expansion diameter adjusting pipe (12), and the starting point push pipe (11) can be pushed to the left along the axial direction by rotating the expansion diameter adjusting pipe (12);

an expansion and contraction mechanism is arranged between the pushing mechanism and the expansion front shaft diameter adjusting mechanism, the expansion and contraction mechanism comprises a plurality of sections of expansion pipes (5) with the same installation direction, a plurality of spring rings (7) and an open pipe (6) installed on the outer diameter of each expansion pipe (5), one end of each expansion pipe (5) is provided with a conical surface (5.2), the other end of each expansion pipe is provided with an end plane (5.6), and the spring rings (7) are installed between the conical surfaces (5.2) and the end planes (5.6) of the adjacent expansion pipes (5); the open pipe (6) is provided with an opening (6.1) which runs through the two ends.

2. The round nut spring ring mechanical expansion and contraction shaft according to claim 1, wherein: the inner diameter of the round nut (3) is connected with the outer diameter of the mandrel (2) through threads, the inner diameter of an extension pipe at the left end of the round nut (3) is matched with the spindle head (1) at the working end, the inner diameter of the extension pipe at the right end is rotationally connected with the outer diameter of the pushing pipe (4) through a circle of steel balls (15), and the pushing pipe (4) is arranged on the mandrel (2) in a sliding manner; one end of the pushing pipe (4) connected with the expansion pipe (5) is also provided with a conical surface (5.2), and a spring ring (7) is also arranged between the conical surface (5.2) of the pushing pipe (4) and an end plane (5.6) of the adjacent expansion pipe (5).

3. The round nut spring ring mechanical expansion and contraction shaft according to claim 1 or 2, wherein: the inner diameter of the expansion adjusting pipe (12) is connected with the outer diameter of the starting point push pipe (11) through threads, the inner diameter of the expansion adjusting pipe (12) is rotationally connected with the outer diameter of the mandrel (2) through a circle of steel balls (15), the starting point push pipe (11) is arranged on the mandrel (2) in a sliding mode, one end, connected with the elastic expansion pipe (5), of the starting point push pipe (11) is also provided with an end plane (5.6), and a spring ring (7) is also arranged between the end plane (5.6) of the starting point push pipe (11) and the conical surface (5.2) of the adjacent elastic expansion pipe (5).

4. The round nut spring ring mechanical expansion and contraction shaft according to claim 3, wherein: guiding and limiting mechanisms are arranged between the pushing pipe (4) and the elastic expansion pipe (5), between adjacent elastic expansion pipes (5) and between the elastic expansion pipe (5) and the starting point pushing pipe (11).

5. The round nut spring ring mechanical expansion and contraction shaft according to claim 4, wherein: the guiding and limiting mechanism is an I-shaped pull rod (8); one end of the pushing pipe (4) is provided with a sliding end T-shaped groove (5.4), two ends of the elastic expansion pipe (5) are respectively provided with a static end T-shaped groove (5.5) and a sliding end T-shaped groove (5.4), one end of the starting pushing pipe (11) is provided with a static end T-shaped groove (5.5), two ends of the I-shaped pull rod (8) are respectively arranged in the sliding end T-shaped groove (5.4) in a sliding mode and fixedly arranged in the static end T-shaped groove (5.5), the pushing pipe (4) and the elastic expansion pipe (5) are connected with each other, adjacent elastic expansion pipes (5) are connected with each other, and the elastic expansion pipe (5) and the starting pushing pipe (11) are connected with each other through the I-shaped pull rod (8).

6. A mechanical expansion shaft with round nut spring rings as claimed in claim 4 or 5, characterized in that: a positioning bolt (9) is arranged on the mandrel (2), the tail end of the positioning bolt (9) is arranged in the threaded blind hole, and the head end of the positioning bolt penetrates through the open pipe (6) to be matched with the open pipe (6) to position the axial position and the radial position of the open pipe (6); the elastic expansion pipe (5) through which the positioning bolt (9) passes is provided with a guide long groove (10), the positioning bolt (9) is positioned in the guide long groove (10), and the length of the guide long groove (10) is greater than the axial stroke of the elastic expansion pipe (5).

7. The round nut spring ring mechanical expansion and contraction shaft according to claim 3, wherein: the section of the spring ring (7) is circular or polygonal, one side surface of the spring ring (7) can be processed into a plane, and the distance between the openings of the spring ring (7) is larger than the middle width of the I-shaped pull rod (8) passing through the openings; the section diameter of the spring ring (7) is equal to or less than the wall thickness of the elastic expansion tube (5), and the outer diameter of the spring ring (7) is equal to or less than the inner diameter of the open tube (6).

8. The round nut spring ring mechanical expansion and contraction shaft according to claim 2, wherein: the outer diameters of the round nut (3) and the working end shaft head (1) are provided with a plurality of hook plate grooves (23) for pulling a hook wrench.

9. The round nut spring ring mechanical expansion and contraction shaft according to claim 4, wherein: the I-shaped pull rod (8) is symmetrical left and right, and the thickness of the I-shaped pull rod is equal to or less than the wall thickness of the elastic expansion tube (5).

10. The round nut spring ring mechanical expansion and contraction shaft according to claim 1, wherein: the length of the open pipe (6) is greater than the sum of the lengths of all the expansion pipes (5) connected in series; the external diameter of opening pipe (6) is equipped with more than two along the axial with positioning bolt (9) complex through-hole, opposite at the through-hole, is equipped with and runs through axial one opening (6.1) in both ends by 1-5mm wide, and the external diameter surface is equipped with several axial V-arrangement grooves, strides opening (6.1) and is equipped with the couple hole that is used for installing several extension spring (22).

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