Mechanical expansion and contraction shaft with pneumatic spring ring

Abstract

The present application belongs to the field of wide-to-narrow change in metal foil and is suitable for the manufacturing of high-end aluminum foil, electromagnetic foil, hand-tearing steel foil and solar film coiling shaft, and relates to a pneumatic spring ring mechanical expansion and contraction shaft, which comprises a mandrel pipe, the two ends of the mandrel pipe are respectively fixed with a driving end shaft head and a working end shaft head; from the driving end shaft head to the working end shaft head, an expansion shaft diameter adjustment mechanism, an expansion and contraction mechanism and a push pipe are sequentially arranged outside the mandrel pipe, a pneumatic pushing mechanism is arranged in the mandrel pipe close to the push pipe; an open pipe is sleeved on the outer periphery of the expansion shaft diameter adjustment mechanism, the expansion and contraction mechanism and the push pipe, and an opening penetrating through both ends is arranged on the open pipe; and a positioning mechanism is arranged between the open pipe and the expansion and contraction mechanism. The shaft of the present application has no inflatable capsule, has high precision, large expansion force, and can be used for thick foil cutting.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of air control spring ring mechanical expansion and contraction shaft, belong to metal foil and high-end electromagnetic foil, hand tear steel foil, solar film, coiling shaft in the field of tool manufacturing technology. BACKGROUND

[0002] The original large roll of metal foil and non-metal cloth, paper large diameter, wide face is cut into small roll products of different widths. The procedure is: the roll tube of the same width as the small roll product is worn on the subject shaft with its own clamping mode background, and is expanded, then unwound and flattened, and the face material is fixed on the roll tube. Through the rotation of the shaft, the cutting of the blade completes the production of width change.

[0003] The main technical requirements for the coiling shaft are: the roll tube is tightly clamped on the shaft without slipping. The radial runout accuracy of the shaft is high. The spacing between the roll tubes is adjustable. It is required to be convenient and fast.

[0004] The earliest hook wrench is used to pull the round nut, and the structure of the round nut shaft clamps the roll tube tightly. The advantage is that the strength of the shaft is high. The main problem is that there is a gap between the inner diameter of the roll tube and the outer diameter of the mandrel, so the radial runout accuracy of the shaft is not high. Since it is clamped axially, the pipe head and the round nut of different lengths are frequently disassembled when adjusting the position of the roll tube and the center line of the original large roll, which is time-consuming and laborious. Moreover, the end face of the roll and the pipe cannot be cut to the required process size.

[0005] At present, the shaft used in the industry is the inflation bag structure type expansion and contraction shaft. Its main advantages are: since it is radially expanded, the spacing between the roll tubes is adjustable, no hook wrench is needed, and it is convenient to operate, which is welcomed by the operators. The main problem is that the roll tube is worn on the shaft surface with several long grooves, the gap between the inner diameter of the roll tube and the outer diameter of the mandrel is about 0.5-2mm, and the inflation bag and the expansion strip installed in the groove are elastic materials. The purpose of inflating the air bag is to expand the roll tube without slipping. The roll tube and the mandrel do not form a rigid whole, as shown in Figure 7 In the prior art, the design accuracy 30 and the actual measurement accuracy 29 of the shaft are actually not equal, and there is no common basis for accuracy. The larger the gap 28, the larger the runout error.

[0006] Under the support of the compressed air and these elastic materials, the shaft center line of the roll tube is easily deviated from the shaft center line of the expansion shaft under the action of gravity and the asymmetric external force of the flattening roller in the equipment. Especially for large heavy roll materials, the outer diameter of the roll will produce periodic wavy runout during high-speed rotation and gradual increase of the roll diameter, as shown in Figure 7As shown, the end face of the roll diameter will produce a jagged edge, at this time the only solution is to reduce the speed of the machine train. In the soft roll of paper and cloth, this problem is not big, but in the high-end metal foil, electromagnetic foil and hand tearing foil, it affects the improvement of production efficiency.

[0007] In order to solve the large radial runout error of the air bag type expansion and contraction shaft reel pipe and improve the product quality, the old type air bag expansion shaft of 150 diameter has been improved in the prior art. The method is: the groove and the air bag and the expansion strip structure remain unchanged, the space occupied by the other five air bags is changed to be pushed by a cylinder, and 84 graphite blocks with a slope of 12 degrees are used to implement accurate mechanical positioning of the reel pipe. After the improvement, the runout accuracy of the shaft is significantly improved, and it is especially suitable for the winding production of thin foil small roll.

[0008] However, the problem of insufficient expansion force and slipping of thick foil, wide and heavy roll has not been fundamentally solved.

[0009] In the prior art in China, a mechanical type expansion and contraction shaft without air bag appears. Patent No. 2006200306893 discloses a high-precision winding expansion and contraction shaft. The advantage is that the outer expansion force of the shaft is significantly improved compared with the air bag shaft. The problem is that the matching gap at A, B and C of the shaft cannot disappear after the expansion sleeve 6, so that the radial runout accuracy of the shaft is difficult to improve. In addition, the expansion block 5 cannot be automatically retracted after expansion, and there are defects of difficult winding and too many turns of the bevel gear nut.

[0010] In the prior art, especially the 75 diameter air bag expansion shaft, in the long groove for installing the air bag, there is a contradiction between high hardness, tool breaking, slow feed and high processing cost. Therefore, the mandrel is mostly made of 40 carbon structural steel, and rarely made of alloy structural steel. In addition, the individual company does not do quenching and tempering in heat treatment. Even if it is done, the tensile strength is very low. Except for the shaft head at both ends of the shaft, the material and the quenching and tempering hardness have never been clearly defined. From the smallest part of the groove section, that is, the bending point of the suspended winding, the straightness accuracy of the shaft becomes worse and worse in production. According to the investigation, the 75 diameter air bag expansion shaft with a length of more than 2m cannot meet the quality requirements of high-end metal foil.

[0011] In view of the defects of the above air bag and part of the mechanical expansion shaft, the inventor has invented a gas control C-shaped ring mechanical type expansion and contraction shaft. And in 2014, the invention patent was granted, and the patent number is: ZL 2012 1 0268830.3. The patent shaft makes substantial improvement on the above several different structures of expansion shaft. The success lies in that the outer expansion force of the shaft on the reel pipe has been obviously enhanced, and the runout accuracy of the shaft diameter has been significantly improved. In the past few years of use, with the development of production to diversity, it is found that there are mainly four deficiencies that need to be improved:

[0012] 1. Because of the axial arrangement of the exposed C-shaped ring spacing problem, the long reel tube can be expanded, but the narrow expansion is not; 2. The two groups of series air cylinders in the opposite direction, due to the asymmetry of the friction, the position of the reel tube which has been adjusted is changed again during the inflation expansion, so it is not convenient to operate; 3. The screw connection pair between the taper wedge tube combination, due to the existence of the bolt, the straight length of the cylindrical head and the small area of the connecting groove, the chain is broken in the frequent reciprocating pull, which affects the normal production; 4. The inflation valve controlled by one valve and two air paths, due to the small sealing area between the internal, the processing cost is high, if the operation hand is not in place, there is a problem of leakage. SUMMARY

[0013] The technical problem to be solved by the present application is to provide a gas control spring ring mechanical expansion and contraction shaft, which solves the above-mentioned problems and can be applied to long reel tubes and narrow reel tubes, maintains the position unchanged during inflation expansion, changes the screw connection pair, ensures the normal production, and controls the air path by one valve, without leakage problem.

[0014] The gas control spring ring mechanical expansion and contraction shaft comprises a mandrel tube, the two ends of the mandrel tube are respectively fixed with a driving end shaft head and a working end shaft head; the outer side of the mandrel tube is provided with, from the driving end shaft head to the working end shaft head, an expansion front shaft diameter adjusting mechanism, an expansion and contraction mechanism and a push tube in sequence, the inner side of the mandrel tube close to the push tube is provided with a pneumatic pushing mechanism; the pneumatic pushing mechanism comprises a piston group and a piston rod, the piston group comprises a piston and an end cover, the end cover is fixedly connected with the mandrel tube, one end of the piston rod penetrates through the end cover and is fixedly connected with the piston, the other end of the piston rod is connected with the push tube through a connecting piece, the forward and backward movement of the piston is controlled by the corresponding air path, and the pushing of the piston is driven by an inflation valve; the expansion front shaft diameter adjusting mechanism, the expansion and contraction mechanism and the push tube are sleeved with an open tube, the open tube is provided with an opening penetrating through both ends; and a positioning mechanism is arranged between the open tube and the expansion and contraction mechanism.

[0015] The driving end shaft head and the working end shaft head are fixed by bolts and the mandrel pipe. In use, the winding pipe is put on the open pipe, and then the expansion shaft is hoisted and clamped between the two shaft seats of the slitting machine. According to the size of the matching gap between the winding pipe and the open pipe, the expansion front shaft diameter adjusting mechanism is adjusted to make the matching gap between the winding pipe and the open pipe as small as possible. The spacing size between the winding pipes is adjusted according to the user's requirements, and then the inflation valve is inflated. The piston drives the piston rod, the piston rod drives the push pipe through the connecting piece, the push pipe drives the expansion and contraction mechanism, the expansion and contraction mechanism realizes the first amplification of the pushing force, the open pipe expands to fix the winding pipe. After slitting, the inflation valve is deflated at the same time, the sealing pipe is inflated, the piston rod is retracted, the expansion and contraction mechanism and the open pipe are automatically retracted, and then the shaft is suspended and wound. The size and technical requirements of the driving end shaft head and the working end shaft head are provided by the user who needs the shaft, because the winding materials to be slitted are different, the slitting equipment models and the structural sizes of the main shaft clamping shaft seats are different.

[0016] Preferably, the inflation valve is arranged on the working end shaft head, the mandrel pipe is provided with an axial inflation hole at the corresponding position, and the inflation hole is communicated with the inflation valve. The working end shaft head is also provided with a sealing pipe, the sealing pipe of the working end shaft head is communicated with the axial inflation hole at the corresponding position of the mandrel pipe. The number of the piston groups is 2-5, the inflation hole is communicated with the space between the pistons and the end cover of the same group, the mandrel pipe is a through shaft pipe and also a cylinder barrel. The end cover is fixedly connected with the mandrel pipe through screws, and the piston is fixedly connected with the piston rod through a shaft retainer. Double sealing rings are arranged between the piston, the end cover, the inner wall of the mandrel pipe and the piston rod, and a plurality of piston groups are arranged to seal the two air passages vertically opposite each other. The number of the piston groups is determined according to the maximum expansion force required by the winding pipe in production. The inflation valve is a normally closed two-position three-way valve, which can be used as a hand press and an inflation gun. The valve body is provided with a filter screen, and the part in contact with the inflation gun, including the sealing pipe, is made of polyurethane material, so that the inflation does not leak, the pressure is high, and the inflation is fast.

[0017] During operation, the inflation valve mounted on the working end shaft head is inflated, the gas enters the space between the pistons and the end cover of the same group through the inflation hole, thereby pushing the piston to move to the left, and the gas on the left side of the piston is discharged through the sealing pipe. The piston moves to the left while driving the piston rod and the push pipe to move to the left, and the push pipe drives the expansion and contraction mechanism. When deflating, the inflation valve is deflated at the same time, the sealing pipe is inflated, the gas enters the space between the pistons and the end cover of the adjacent group, thereby pushing the piston to move to the right and retracting, driving the piston rod and the push pipe to move to the right, the expansion and contraction mechanism unloads, and the open pipe retracts.

[0018] Preferably, the working end shaft head is provided with a groove near the end of the piston rod, the piston rod end is located in the groove, the working end shaft head on both sides of the groove is provided with a guide long hole corresponding to the pipe wall of the mandrel pipe; the piston rod end is provided with a four-way, the connecting piece is a light shaft, one end of the light shaft penetrates the piston rod end and the four-way, then is inserted into the hole in the pipe wall of the push pipe through the guide long hole and is fixed. The piston rod moves left and right to realize that the piston rod drives the push pipe to move axially along the guide long hole through the light shaft; the four-way protects the light shaft, and the two ends are not bent under the condition that the shaft is under the maximum pushing force.

[0019] Preferably, the expansion mechanism comprises a plurality of expansion pipes and a plurality of spring rings, the expansion pipe is provided with an end plane and an inner ring table at the end close to the push pipe, the expansion pipe is provided with a conical surface at the end away from the push pipe, the conical surface of the latter expansion pipe is matched with the inner ring table of the former expansion pipe, and the spring ring is installed outside the conical surface; the expansion pipe and the spring ring are cooperatively arranged in the open pipe. The steel wire section of the spring ring is circular or polygonal; one side of the spring ring can be machined with a plane, the spring ring is provided with an opening; the section and the outer diameter of the ring are equal to or smaller than the wall thickness and the outer diameter of the expansion pipe, the plane to be installed is close to the end plane of the expansion pipe, and the spring ring has elasticity of expansion and self-retraction in the potential energy generated by torsion and bending machining. The steel wire is cold-drawn by a mold, and the section size precision is extremely high in the length of several kilometers. After the steel wire is bent into a spring ring, it is connected between the mandrel pipe and the open pipe, so that the coaxiality and radial runout precision of the shaft reach the highest. The spring ring is machined with a plane on one side, and the thickness to be removed is determined according to the size of the expansion size of the spring ring. If the expansion size is small, the plane can also not be machined. The inner diameter of the open pipe is greater than the outer diameter of the expansion pipe combination, the outer diameter is smaller than the minimum inner diameter of the winding pipe, and the length of the open pipe is smaller than the length of the combination between the starting pipe before expansion and the push pipe.

[0020] The expansion pipe is provided with a conical surface of 10°-30° from the conical end surface, an annular groove smaller than the length of the conical surface is provided at the maximum outer diameter of the conical surface, and the wall thickness of the bottom of the annular groove is 2-8 times the wall thickness of the expansion pipe. From the conical end surface to the other side of the annular groove, the conical surface exceeds three equal parts, and an opening with a width of 0.1-3 mm is provided; an inner ring table is provided from the half of the pipe wall thickness, and the depth of the inner ring table can accommodate and be greater than the movement distance of the expansion pipe.

[0021] During work, the push pipe pushes the expansion pipe to the left, the expansion pipe moves to the left, and the spring ring on the conical surface is blocked by the end plane of the front expansion pipe. Under the pushing of the conical surface, the spring ring expands along the machining accuracy of the conical surface. The rear spring ring is the same as the front spring ring, until the shaft stops moving axially to the original position, so that the coaxiality of the open pipe is kept within a very high precision range. The length of the expansion pipe combination is determined according to the minimum width of the product winding and the length of the expansion shaft.

[0022] Preferably, the pre-expansion shaft diameter adjustment mechanism comprises an expansion diameter adjustment tube and a starting push tube, the starting push tube is arranged between the expansion diameter adjustment tube and the expansion and contraction mechanism, the end of the starting push tube close to the expansion and contraction mechanism is provided with a starting ring platform, the starting ring platform is matched with the conical surface of the adjacent expansion tube; the end of the starting push tube close to the expansion diameter adjustment tube is provided with an external thread, the external thread is threadedly connected with the internal thread of the inner diameter of the expansion diameter adjustment tube. The expansion diameter adjustment tube is provided with a slot hole, and the inner wall of the expansion diameter adjustment tube and the outer wall of the mandrel tube at the corresponding position are provided with a steel ball annular groove, the steel ball annular groove is communicated with the slot hole, a steel ball is arranged in the steel ball annular groove, greater axial pushing force can be obtained, and the friction is minimized when the expansion diameter adjustment tube is rotated; and the expansion diameter adjustment tube is further provided with an exhaust hole. During adjustment, the expansion diameter adjustment tube is rotated, and the gap between the winding drum tube and the opening tube is appropriately adjusted to be smaller.

[0023] Preferably, the push tube at the position corresponding to the opening of the opening tube is provided with a through screw hole, and a self-locking bolt is arranged in the through screw hole. The self-locking bolt is an internal hexagonal flat end bolt, and the middle part of the self-locking bolt passes through the opening of the opening tube during installation. When air leakage occurs, the self-locking bolt is tightened downward, the self-locking bolt tightly supports the push tube, and the push tube and the mandrel tube are fixed; before the winding is completed and the coil is extracted, the self-locking bolt can be loosened by reverse rotation. Two self-locking bolts are installed along the axial direction of the push tube, and one is used and the other is reserved.

[0024] Preferably, the end of the push tube close to the expansion and contraction mechanism is provided with a push conical surface, the push conical surface is sleeved with a spring ring, and the push conical surface and the spring ring are matched with the expansion and contraction mechanism, so that the cooperation between the push tube and the expansion tube is continuous.

[0025] Preferably, the positioning mechanism comprises a positioning bolt, the bottom end of the positioning bolt is threadedly connected and fixed with the wall of the mandrel tube, the wall of the expansion tube at the position where the positioning bolt is arranged is provided with a guide long groove, the opening tube is provided with a through hole at the position corresponding to the positioning bolt, and the upper end of the positioning bolt penetrates through the guide long groove and the through hole of the opening tube. The number of positioning bolts is two or more, only the wall of the expansion tube at the position where the corresponding positioning bolt is arranged is provided with a guide long groove, and the width of the guide long groove is matched with the positioning bolt. The top end of the positioning bolt is not higher than the outer wall of the opening tube. A plurality of positioning bolts can simultaneously limit the rotation of the opening tube, but the arrangement of the positioning bolt does not affect the radial expansion of the opening tube.

[0026] Preferably, the adjacent expansion tubes are provided with an I-shaped pull rod, the two ends of the expansion tube are respectively provided with a stationary end T-shaped groove and a sliding end T-shaped groove, the two ends of the I-shaped pull rod are respectively slidably arranged in the sliding end T-shaped groove and fixedly arranged in the stationary end T-shaped groove, and the adjacent expansion tubes are connected through the I-shaped pull rod; the push tube is provided with a sliding end T-shaped groove, and the I-shaped pull rod is arranged between the push tube and the adjacent expansion tube, and the two ends of the I-shaped pull rod are respectively slidably arranged in the sliding end T-shaped groove of the push tube and fixedly arranged in the stationary end T-shaped groove of the expansion tube.

[0027] The total stroke of the axial movement of the piston and the push tube is the sum of the stroke of the outward expansion of each conical surface and the expansion tube to the left and the retraction to the right.

[0028] Preferably, a I-shaped pull rod is arranged between the starting push tube and the adjacent expansion tube, a static end T-shaped slot is arranged on the starting push tube, and the two ends of the I-shaped pull rod are respectively arranged in the sliding end T-shaped slot of the expansion tube and the fixed T-shaped slot of the static end of the starting push tube.

[0029] Preferably, the cross section of the spring ring steel wire is circular or polygonal. One side of the spring ring steel wire can be processed into a flat surface, and the opening distance of the ring is greater than the width of the middle of the I-shaped pull rod passing through. In order to further strengthen the contraction function of the expanded opening tube, a plurality of extension springs are arranged at the hook holes symmetrically arranged on both sides of the opening of the opening tube, so that the opening tube has a long-term outer diameter mechanical contraction force, and the opening tube does not become difficult to wear and roll due to the weakening of the contraction function and the increase of the outer diameter.

[0030] The opening distance of the spring ring is greater than the width of the middle of the I-shaped pull rod passing through; the I-shaped pull rod is symmetrical to left and right, and the thickness is equal to or less than the wall thickness of the expansion tube; the I-shaped pull rod passes through the opening of the spring ring and is arranged in the sliding end T-shaped slot and the static end T-shaped slot of the end of the adjacent two expansion tubes;

[0031] The spring ring / cone surface expansion accuracy is formed: the expansion tube and the spring ring arranged in the inner diameter of the opening tube are connected by the I-shaped pull rod, so that the piston realizes the secondary expansion of the drum tube. The expansion of the spring ring is pushed from right to left in series, and stops when the balance cannot be pushed any more. The radial coaxiality and runout accuracy of the shaft are related to the machining accuracy of the spring ring / cone surface, and are irrelevant to the size of the pushing force and the position of the spring ring in the inner diameter of the opening tube.

[0032] The above-mentioned spring ring / cone surface mechanical secondary thrust amplification mechanism of the shaft is equivalent to the typical force amplification combination of bevel to bevel. The difference is that the conical surface is equivalent to the bevel, and the opposite side of the conical surface is not a bevel but a circle, which is the cross section of the spring ring. The feature of using the circle on the rotary shaft is that the radial occupied size is small, which is beneficial to the increase of the cross section area of the mandrel tube and the improvement of the bending strength of the shaft.

[0033] The present application is improved in view of the four main defects in the existing technology, especially in the patent ZL 2012 1 0268830.3 of the present inventor.

[0034] (1) In the original C-shaped ring combination, an open pipe is added to the outer diameter, which can only expand and contract radially, and cannot move axially and rotate radially; the long and short reel pipes can be tightly clamped without slipping; and the spacing between the reel pipes can also be adjusted;

[0035] (2) Due to the addition of the open pipe, the original patent expansion shaft cancels the group of series air cylinder combinations in the driving side spindle pipe, thereby reducing the manufacturing cost of the shaft;

[0036] (3) The "screw connection pair 6" described in the ZL 2012 1 0268830.3 patent is cancelled, and the scheme of the I-shaped pull rod connecting the elastic expansion pipe combination is improved, so that one end of the I-shaped pull rod installed in the T-shaped groove of the elastic expansion pipe static end is fixed along the shape, the other end is installed on the I-shaped pull rod in the T-shaped groove of the spring pipe sliding end, and the I-shaped pull rod can axially slide freely and be not easily broken in frequent contraction and retreat;

[0037] (4) The inflation valve scheme of one valve controlling two air paths, which separates the valve this time, is beneficial to the pressure maintenance and fault finding of the shaft.

[0038] The inventor of the present application improves the above four main defects on the basis of the ZL 2012 1 0268830.3 patent, in order to reduce the manufacturing cost of the shaft, one shaft is used for multiple purposes, and the pre-expansion shaft diameter adjustment mechanism of the shaft is increased. Capsule rupture and air leakage occur from time to time, in order to avoid the loss caused by the air bag and the air leakage of the expansion and contraction shaft in the existing technology, in this patent application file, the post-expansion self-locking mechanism of the shaft is increased.

[0039] The present application has the following beneficial effects compared with the prior art:

[0040] I. The spindle pipe itself is a through shaft, which is also a cylinder, under the condition of six kilogram inflation pressure, the multiple series air cylinders of the piston, the primary thrust amplification mechanism and the mechanical secondary thrust of the spring ring / cone surface are integrated. The total outer expansion clamping force of the open pipe to the reel pipe can be close to three tons or more, compared with the shaft in the prior art, the reel pipe will not appear intermittent slipping phenomenon; the unevenness of the wrinkle will not affect the surface tension quality, and the thin foil and thick foil can be used for one shaft.

[0041] II. The entire shaft is without inflation bag, after the reel pipe is expanded tightly, as shown in Figure 8 , a, b, c, d, the cooperation gap in the shaft disappears; after the metal and the reel pipe are integrated, the shaft jumping accuracy and bending strength are improved.

[0042] Three, the outer diameter of the winding shaft and the inner diameter of the winding tube in reality, mainly 150 mm, 75 mm, are determined according to different requirements of the user slitting machine equipment, although the difference is not big, but the size is different; the winding tube in the prior art is worn on the shaft, and the size of the matching gap cannot be adjusted, and the user needs to replace the shafts with different shaft diameters to adjust the matching gap and improve the product quality during winding; the shaft is provided with a pre-expansion shaft diameter adjusting mechanism, which reduces the manufacturing cost of the shaft, is beneficial to the user to reduce the purchase quantity, and reduces the production cost.

[0043] Four, in order to adjust the center line position of the original roll, the operator needs to repeatedly disassemble the round nut and the pipe head with different lengths in production, which is time-consuming and laborious, and it is not conducive to the safety and civilized production of the workshop. In addition, the relative process size of the roll end face and the winding tube end face required by the user cannot be processed. The gas control spring ring mechanical expansion and contraction shaft in the present application is convenient, fast and accurate in axial adjustment of the winding tube, improves the work efficiency and reduces the labor intensity.

[0044] Five, the structure design mainly based on lathe processing, pursues high precision and low cost; the lathe processing shaft workpiece in machining has high precision and efficiency, while the processing of the gas bag expansion shaft groove is mainly based on milling machine, which affects the improvement of the shaft strength. The design idea of the present application is to fully utilize and develop the characteristics of high precision and efficiency of lathe processing of rotary body surface, cooperate with reprocessing of standard materials, reduce the production cost of the shaft, and improve the coaxiality and radial runout precision of the shaft.

[0045] Six, if the existing gas bag and its shaft leak in rotation, the finished product roll will become waste product at once, especially the loss of high-end electromagnetic foil and hand tearing steel foil is greater than the value of several shafts, and the self-locking bolt of the shaft provided at the pushing pipe of the present application avoids the occurrence of this problem.

[0046] Seven, the gas bag of the gas bag expansion shaft is expanded to the thickest, which needs 15 seconds on average, the structure shaft of the present application is expanded to the position only in 3 seconds when inflating the inflation valve 18, which is beneficial to the improvement of work efficiency, and the vibration sound of the piston in place gives the operator another clear signal of being in place, which cannot be achieved by the gas bag expansion shaft. BRIEF DESCRIPTION OF DRAWINGS

[0047] Figure 1 is a structure schematic view of the gas control spring ring mechanical expansion and contraction shaft;

[0048] Figure 2 is Figure 1 A-A sectional view in the present application;

[0049] Figure 3 is a sectional view of the elastic expansion pipe;

[0050] Figure 4 is Figure 1 schematic view of E direction in the middle;

[0051] Figure 5 is Figure 2 schematic view of F direction in the middle;

[0052] Figure 6 is Figure 5 schematic view of the installation of the tension spring on the open pipe at G;

[0053] Figure 7 is the schematic view of the air bag expansion shaft in the prior art (the greater the matching gap, the greater the jumping error);

[0054] Figure 8 is the schematic view of the self-disappearance of the a, b, c, d matching gap after inflation in the present application.

[0055] In the figure: 1, drive end shaft head; 2, mandrel pipe; 3, steel ball annular groove; 4, expansion diameter adjusting pipe; 5, expansion pipe; 5.1, conical end face; 5.2, conical surface; 5.3, ring groove; 5.4, sliding end T-shaped groove; 5.5, static end T-shaped groove; 5.6, end flat; 5.7, inner ring table; 6, open pipe; 6.1, opening; 7, positioning bolt; 8, I-shaped pull rod; 9, starting point push pipe; 10, guide long groove; 11, spring ring; 12, end cover; 13, inflation hole; 14, push pipe; 15, working end shaft head; 16, winding drum pipe; 17, optical axis; 18, inflation valve; 19, guide long slot; 20, sealing pipe; 21, piston; 22, piston rod; 23, four-way; 24, self-locking bolt; 25, tension spring; 26, rubber expansion strip; 27, inflation bag; 28, matching gap; 29, actual measurement accuracy; 30, design accuracy of shaft. DETAILED DESCRIPTION

[0056] The present application will be further described below in conjunction with the drawings:

[0057] As Figures 1-8The pneumatic spring ring mechanical expansion and contraction shaft of the application comprises a mandrel pipe 2, the two ends of the mandrel pipe 2 are respectively fixed with a driving end shaft head 1 and a working end shaft head 15; the outer side of the mandrel pipe 2 is sequentially provided with a pre-expansion shaft diameter adjusting mechanism, an expansion and contraction mechanism and a push pipe 14 from the driving end shaft head 1 to the working end shaft head 15, the inner side of the mandrel pipe 2 close to the push pipe 14 is provided with a pneumatic pushing mechanism; the pneumatic pushing mechanism comprises a piston group and a piston rod 22, the piston group comprises a piston 21 and an end cover 12, the end cover 12 is fixedly connected with the mandrel pipe 2, one end of the piston rod 22 penetrates through the end cover 12 and is fixedly connected with the piston 21, the other end of the piston rod 22 is connected with the push pipe 14 through a connecting piece, the movement of the piston 21 is controlled by corresponding air paths, and the pushing of the piston 21 is driven by an inflation valve 18; the pre-expansion shaft diameter adjusting mechanism, the expansion and contraction mechanism and the push pipe 14 are peripherally sleeved with an open pipe 6, the open pipe 6 is provided with an opening penetrating through both ends; and a positioning mechanism is arranged between the open pipe 6 and the expansion and contraction mechanism.

[0058] In the embodiment:

[0059] The inflation valve 18 is arranged on the working end shaft head 15, the mandrel pipe 2 is provided with an axial inflation hole 13 at the corresponding position, the inflation hole 13 is communicated with the inflation valve 18; the working end shaft head 15 is further provided with a sealing pipe 20, the sealing pipe 20 on the working end shaft head 15 is communicated with the axial sealing pipe 20 at the corresponding position of the mandrel pipe 2; the number of the piston groups is 2-5, the inflation hole 13 is communicated with the space between the piston 21 and the end cover 12 of the same group, and the sealing pipe 20 on the mandrel pipe 2 is communicated with the space between the piston 21 and the end cover 12 of the adjacent group. The mandrel pipe 2 itself is a through shaft pipe and also a cylinder barrel; the end cover 12 is fixedly connected with the mandrel pipe 2 through screws, and the piston 21 is fixedly connected with the piston rod 22 through a shaft retainer; double sealing rings are arranged between the piston 21, the end cover 12, the inner wall of the mandrel pipe 2 and the piston rod 22, and a plurality of piston groups are arranged to seal the two air passages vertically opposite each other without air leakage; the number of the piston groups is determined according to the maximum external expansion force required by the reel pipe 16 in production. The inflation valve 18 is a normally closed two-position three-way valve, which is hand-operated and used for both inflation gun and inflation gun, and is characterized in that a filter screen is arranged in the valve body, the part in contact with the inflation gun, including the sealing pipe 20, is made of polyurethane material, so that the inflation does not leak, the pressure is high, and the inflation is fast.

[0060] During operation, the inflation valve 18 is inflated, and the gas enters the space between the piston 21 and the end cover 12 of the same group through the inflation hole 13, thereby pushing the piston 21 to move to the left, and the gas on the left side of the piston 21 is discharged through the sealing tube 20. The piston 21 moves to the left, and the piston rod 22 and the push tube 14 are also moved to the left, and the push tube 14 pushes the expansion mechanism; during deflation, the inflation valve 18 is deflated, and the sealing tube 20 is inflated at the same time, and the gas enters the space between the end cover 12 and the piston 21 of the adjacent group, thereby pushing the piston 21 to move to the right and retract, and the piston rod 22 and the push tube 14 are also moved to the right, and the I-shaped pull rod 8 is pulled to the right, the expansion mechanism is unloaded, and the open tube 6 is retracted.

[0061] The working end shaft head 15 near the one end of the piston rod 22 is provided with a groove, the end of the piston rod 22 is located in the groove, and the working end shaft head 15 and the corresponding position of the mandrel tube 2 on both sides of the groove are provided with a guide long hole 19; the end of the piston rod 22 is provided with a four-way valve 23, the connecting piece is a light shaft 17, the two ends of the light shaft 17 penetrate the end of the piston rod 22 and the four-way valve 23, and then are inserted into the hole in the wall of the push tube 14 after passing through the guide long hole 19 and are fixed. The piston rod 22 moves left and right, and the piston rod 22 drives the push tube 14 to move axially along the guide long hole 19 through the light shaft 17; the four-way valve 23 protects the light shaft 17, and the two ends are not bent in the case that the shaft is under the maximum pushing force.

[0062] The expansion mechanism includes a plurality of expansion tubes 5 and a plurality of spring rings 11. The end of the expansion tube 5 close to the push tube 14 is provided with an end plane 5.6 and an inner ring table 5.7, and the end of the expansion tube 5 away from the push tube 14 is provided with a conical surface 5.2. The conical surface 5.2 of the latter expansion tube 5 is matched with the inner ring table 5.7 of the former expansion tube 5, and the spring ring 11 is installed on the outer periphery of the conical surface 5.2. The expansion tube 5 and the spring ring 11 are matched and arranged in the open tube 6. The steel wire section of the spring ring 11 is circular or polygonal. One side of the spring ring 11 can be machined with a plane, and the spring ring 11 is provided with an opening. The section and the outer diameter of the ring are equal to or smaller than the wall thickness and the outer diameter of the expansion tube 5. The plane to be installed is close to the end plane 5.6 of the expansion tube 5. The spring ring 11 has elasticity of expansion and self-retraction in the potential energy generated by torsion and bending processing. The steel wire is cold-drawn by a mold, and the section size precision is extremely high in the length of several kilometers. After the spring ring 11 is processed by bending, it is connected between the mandrel tube 2 and the open tube 6, so that the coaxiality and radial runout precision of the shaft are the highest. The spring ring 11 is processed with a plane on one side, and the thickness to be removed is determined according to the size of the expansion size of the spring ring 11. If the expansion size is small, the plane can not be machined. The inner diameter of the open tube 6 is greater than the outer diameter of the expansion tube 5 combination, the outer diameter is smaller than the minimum inner diameter of the winding tube 16, and the length of the open tube 6 is smaller than the sum of the lengths of the combination between the starting tube before expansion and the push tube 14.

[0063] The bulging tube 5 is provided with a 10°-30° conical surface 5.2 from the conical end surface 5.1, and is provided with a ring groove 5.3 smaller than the length of the conical surface 5.2 at the largest outer diameter of the conical surface 5.2, the wall thickness of the bottom of the ring groove 5.3 is 2-8 times of the wall thickness of the bulging tube 5. From the conical end surface 5.1 to the other side of the ring groove 5.3, the conical surface 5.2 is more than three equal parts, and is provided with an opening with a width of 0.1-3 mm; an inner ring platform 5.7 is provided from the half of the tube wall thickness, and the depth of the inner ring platform 5.7 can accommodate and be greater than the moving distance of the bulging tube 5.

[0064] In operation, the pushing tube 14 pushes the bulging tube 5 to the left, and the bulging tube 5 moves to the left, and under the blocking of the front bulging tube 5 end plane 5.6, the spring ring 11 on the conical surface 5.2 is pushed along the conical surface, and the machining accuracy of the conical surface is expanded, and the rear spring ring 11 is also expanded along with the front spring ring 11 until the axial position is stopped, so that the coaxiality of the opening tube 6 is kept within a high accuracy range. The length of the bulging tube 5 combination is determined according to the minimum width of the product coil and the length of the bulging shaft.

[0065] The bulging diameter adjustment mechanism includes a bulging diameter adjustment tube 4 and a starting pushing tube 9, the starting pushing tube 9 is arranged between the bulging diameter adjustment tube 4 and the bulging and shrinking mechanism, the end of the starting pushing tube 9 close to the bulging and shrinking mechanism is provided with a starting ring platform, the starting ring platform cooperates with the conical surface 5.2 of the adjacent bulging tube 5; the outer periphery of the end of the starting pushing tube 9 close to the bulging diameter adjustment tube 4 is provided with an external thread, and the external thread is threadedly connected with the internal thread of the inner diameter of the bulging diameter adjustment tube 4. The bulging diameter adjustment tube 4 is provided with a slot hole, and the inner wall of the bulging diameter adjustment tube 4 and the outer wall of the corresponding position of the mandrel tube 2 are provided with a steel ball annular groove 3, the steel ball annular groove 3 is communicated with the slot hole, a steel ball is arranged in the steel ball annular groove 3, the axial pushing force can be greater, and the friction is the smallest when the bulging diameter adjustment tube 4 is rotated; and the bulging diameter adjustment tube 4 is further provided with an exhaust hole. During adjustment, the bulging diameter adjustment tube 4 is rotated, and the gap between the coil tube 16 and the opening tube 6 is appropriately adjusted to be smaller.

[0066] The pushing tube 14 at the position corresponding to the opening of the opening tube 6 is provided with a through screw hole, and a self-locking bolt 24 is arranged in the through screw hole. The self-locking bolt 24 is an internal hexagonal flat end bolt, and the middle part of the self-locking bolt 24 passes through the opening of the opening tube 6 during installation. When air leakage occurs, the self-locking bolt 24 is tightened downward, the self-locking bolt 24 tightly supports the pushing tube 14, and the pushing tube 14 is fixed with the mandrel tube 2; before the winding is completed and before the coil is extracted, the self-locking bolt 24 is loosened in the reverse direction. Two self-locking bolts 24 are used one by one, and are installed along the axial direction of the pushing tube 14.

[0067] The pushing cone surface of the pushing tube 14 near the end of the expansion mechanism is provided with a spring ring 11, and the pushing cone surface and the spring ring 11 are matched with the expansion mechanism, so that the cooperation between the pushing tube 14 and the expansion tube 5 is continuous.

[0068] The positioning mechanism comprises positioning bolts 7, the bottom ends of the positioning bolts 7 are fixedly connected with the wall of the mandrel tube 2 in a threaded manner, the wall of the expansion tube 5 corresponding to the positions of the positioning bolts 7 is provided with a guide long groove 10, the opening tube 6 is provided with a through hole at a position corresponding to the positioning bolt 7, and the upper end of the positioning bolt 7 penetrates through the guide long groove 10 and the through hole of the opening tube 6. The number of the positioning bolts 7 is two or more, only the wall of the expansion tube 5 corresponding to the positions of the positioning bolts 7 is provided with the guide long groove 10, the width of the guide long groove 10 is matched with the positioning bolt 7, and the top end of the positioning bolt 7 is not higher than the outer wall of the opening tube 6. Meanwhile, the rotation of the opening tube 6 is limited, but the setting of the positioning bolt 7 does not affect the radial expansion of the opening tube 6.

[0069] The adjacent expansion tubes 5 are provided with I-shaped pull rods 8, the two ends of the expansion tube 5 are respectively provided with a static end T-shaped groove 5.5 and a sliding end T-shaped groove 5.4, the two ends of the I-shaped pull rod 8 are respectively slidably arranged in the sliding end T-shaped groove 5.4 and fixedly arranged in the static end T-shaped groove 5.5, and the adjacent expansion tubes 5 are connected through the I-shaped pull rod 8. The pushing tube 14 is provided with a sliding end T-shaped groove 5.4, and the I-shaped pull rod 8 is arranged between the pushing tube 14 and the adjacent expansion tube 5, and the two ends of the I-shaped pull rod 8 are respectively slidably arranged in the sliding end T-shaped groove 5.4 of the pushing tube 14 and fixedly arranged in the static end T-shaped groove 5.5 of the expansion tube 5.

[0070] The I-shaped pull rod 8 is arranged between the starting pushing tube 9 and the adjacent expansion tube 5, the starting pushing tube 9 is provided with a static end T-shaped groove 5.5, and the two ends of the I-shaped pull rod 8 are respectively slidably arranged in the sliding end T-shaped groove 5.4 of the expansion tube 5 and fixedly arranged in the static end T-shaped groove 5.5 of the starting pushing tube 9.

[0071] The cross section of the steel wire of the spring ring 11 is circular or polygonal. One side of the steel wire of the spring ring 11 can be processed into a flat surface, and the opening distance of the ring is greater than the middle width of the I-shaped pull rod 8 passing through.

[0072] In order to further strengthen the contraction function of the opening tube 6 after expansion, a plurality of tension springs 25 are arranged at the hook holes on the two symmetrical sides of the opening 6.1 of the opening tube 6, and the purpose is to add a set of long-term external diameter mechanical contraction force to the opening tube, so that the opening tube 6 does not weaken the self-contraction function due to long-term and frequent expansion, and the increase of the external diameter causes the emergence of the difficulty in pipe penetration and volume extraction.

[0073] The distance between the openings of the spring ring 11 is greater than the width of the middle rod of the I-shaped pull rod 8 passing through; the I-shaped pull rod 8 is symmetrical left and right, and the thickness is equal to or less than the wall thickness of the spring expansion pipe 5; the I-shaped pull rod 8 passes through the opening of the spring ring 11 and is installed in the sliding end T-shaped groove 5.4 and the stationary end T-shaped groove 5.5 at the end of the adjacent two spring expansion pipes 5.

[0074] The total stroke of the axial movement of the piston and the push pipe 14 is the sum of the strokes of each taper and the spring expansion pipe 5 expanding outward to the left and retracting to the right.

[0075] The formation of the spring ring 11 / taper outward expansion accuracy: the spring expansion pipe 5 and the spring ring 11 installed in the inner diameter of the open pipe 6 are combined in series, connected by the I-shaped pull rod 8, and realize the secondary expansion of the piston 21 to the reel pipe 16. The outward expansion of the spring ring 11 is pushed from right to left in series until it stops after balancing, and the radial coaxiality and runout accuracy of the shaft are formed. It is mainly related to the machining accuracy of the spring ring 11 / taper, and has nothing to do with the size of the push force and the position of the spring ring 11 in the inner diameter of the open pipe 6.

[0076] The above-mentioned spring ring 11 / taper mechanical secondary thrust amplification mechanism of the shaft is equivalent to the typical force amplification combination of bevel to bevel. The difference is that the taper is equivalent to the bevel, and the opposite side of the taper is not a bevel but a circle, which is the cross-sectional circle of the spring ring 11. The feature of using it on the rotating shaft is that the radial occupied size is small, which is beneficial to the increase of the cross-sectional area of the mandrel pipe 2 and the improvement of the bending strength of the shaft.

[0077] The driving end shaft head 1 and the working end shaft head 15 are fixed with the mandrel pipe 2 through bolts. In use, the reel pipe 16 is put on the open pipe 6, and then the expansion shaft is hung between the two shaft seats of the slitting machine for clamping; according to the size of the matching gap between the reel pipe 16 and the open pipe 6, the expansion front shaft diameter adjusting mechanism is adjusted so that the matching gap between the reel pipe 16 and the open pipe 6 is adjusted to the minimum; the spacing size between the reel pipes 16 is adjusted according to the user's requirements, and then the inflation valve 18 is inflated, the piston 21 drives the piston rod 22, the piston rod 22 drives the push pipe 14 through the connecting piece to push the expansion mechanism, the expansion mechanism realizes the first amplification of the pushing force, and the push pipe 14 and the expansion pipe 5 combination are pushed through the optical shaft 17, so that the spring ring 11 installed on the conical surface 5.2 is converted into radial and expanded with the open pipe 6 under the blocking of the pipe end plane 5.6, and the high-speed rotation and non-jumping slitting are completed, thereby the spring ring 11 / conical surface production task of the mechanical secondary pushing force amplification mechanism is completed with high quality, the open pipe 6 is expanded to fix the reel pipe 16; after slitting, the inflation valve 18 is deflated while the sealing pipe air path is inflated, the piston rod 22 is retracted, the expansion mechanism and the open pipe 6 are automatically retracted, and then the shaft is suspended and reeled. The size and technical requirements of the driving end shaft head 1 and the working end shaft head 15 are provided by the user who needs the shaft, because the slitted coiled material is different, the slitting equipment model and the structure size of the main shaft clamping shaft seat are different.

[0078] The opening 6.1 of the open pipe 6 penetrates through both ends, and the opening 6 has a width of 1 mm-5 mm; and the outer diameter axial surface of the open pipe 6 is provided with a plurality of axial V-shaped grooves with a depth of 0.2 mm-2 mm, which can increase the clamping force on the reel pipe 16, which is much more firm than the friction expansion of the air bag expansion shaft; the way to form the expansion function of the open pipe 6: (1) the maximum outer diameter of the processed open pipe 6 is smaller than the minimum inner diameter of the reel pipe 16; (2) the steel pipe with high elongation is preferably selected.

[0079] The problem to be solved by setting the expansion front shaft diameter adjusting mechanism of the shaft: in the prior art, taking aluminum foil winding as an example, the reel pipe 16 commonly used for winding foil reels has an inner diameter mainly of 150 +³ mm, and the outer diameter of the commonly used winding shaft is 150-0.5 mm. In this way, the maximum matching gap between the shaft and the reel pipe 16 is 3.5 mm, and according to the air bag and other shafts, the larger the matching gap, the larger the jumping error. The radial jumping gap of the shaft is 3.5 mm, which is too far from the required 0.05 jumping error. In order to solve this problem, the method adopted in practice is to process several small matching gap outer diameter shafts within the size range of 3.5 mm for matching with the reel pipe 16, the purpose is to reduce the maximum matching gap of 3.5 mm, which inevitably increases the number of shafts purchased.

[0080] The expansion shaft diameter adjustment mechanism in the application, by adjusting the size of the expansion shaft outer diameter, makes the expansion tube 5 combined stroke not exceed the maximum movement range of the piston 21, and makes the axial advance and retreat stroke of the spring ring 11 the shortest. This not only shortens the inflation and deflation time of the inflation valve 18, but also improves the working efficiency of the shaft.

[0081] The use method of the expansion shaft diameter adjustment mechanism and the positional relationship with the positioning bolt 7: In this starting position, it can be seen that more than two positioning bolts 7 are at the middle position of the guide long groove 10. According to the attached Figure 1 The use method is that if it is found that the inner diameter of the reel tube 16 is too small to fit into the opening tube 6, or it is difficult to push into the opening tube 6, or it feels too much pushing force after being pushed in, in this case, the outer diameter of the opening tube 6 should be made smaller. The method is to rotate the expansion diameter adjustment tube 4, make the starting push tube 9 retreat to the left end of the shaft through the I-shaped pull rod 8, at this time, the outer diameter of the opening tube 6 will follow the retraction, and retract to the right end face of the guide long groove 10, and not touch the positioning bolt 7. Conversely, if it is found that the fit clearance between the opening tube 6 of the shaft and the reel tube 16 is too large, at this time, the outer diameter of the opening tube 6 should be made larger. The method is to rotate the expansion diameter adjustment tube 4, make the starting push tube 9 push the expansion tube 5 combination to the right end of the shaft through the I-shaped pull rod 8, at this time, the outer diameter of the opening tube 6 will follow the expansion, and expand to the left end face of the guide long groove 10, and not touch the positioning bolt 7. The reel tube 16 is batch purchased, and for each expansion shaft, it is not necessary to adjust the outer diameter of the shaft every time, and the operator can adjust the middle length.

[0082] The installation method of the piston 21, the piston rod 22 and the end cover 12 of the series gas cylinder: as shown in Figure 1 The recesses inside the inner and outer diameters of the piston 21 and the end cover 12 in the shaft series gas cylinder thrust amplification mechanism are installed with U-shaped sealing rings and O-shaped sealing rings in two specifications and directions. According to the arrangement order of the piston 21 and the end cover 12 on the piston rod 22, the spring retainer is first installed in the recesses on both sides of the piston 21 from the right end of the mandrel tube 2. The next step is to push the installed piston rod 22 combination into the gas cylinder shaft hole cavity from the right end of the mandrel tube 2, fix the bolt on the outer diameter of the end cover 12 from the bolt hole of the mandrel tube 2, install the four-way valve 23 at the right end of the piston 21, and pass the light shaft 17 through the radial hole of the four-way valve 23 and the piston 21, and fix it in the through hole of the tube wall at both ends of the push tube 14. Figure 1

[0083] The key is that the sealing elements and the grooves are coated with lithium-based lubricating grease as lubricant, and a little 32# oil mist oil is coated in the cylinder cavity. The installed piston 21 and end cover 12 are one group or more than one group.

[0084] ​The gas viscosity in the pneumatic control is low, and the leakage is invisible to the naked eye. The existing technology has the phenomenon of leakage of the air bag and other expansion shafts. In order to avoid this problem, the double sealing and other measures are adopted in the present application. The working time of each roll after inflation is about 30 minutes on average, but the pressure maintaining time required in the acceptance is 48 hours, and no leakage phenomenon occurs. Although the double sealing design is adopted, in order to be safe, the self-locking bolt 24 is additionally arranged, and the purpose is to provide a measure for the operator to continue to use the existing shaft without replacing the shaft and stopping production if the leakage phenomenon occurs.

[0085] The installation sequence of the spring ring 11 / taper surface mechanical secondary thrust amplification mechanism of the shaft is as follows: Figure 1 As shown in the figure, the driving end shaft head 1 is installed in the inner diameter of the shaft hole of the mandrel pipe 2 at the left end of the expansion shaft, and is fixed by two or more bolts. After the expansion diameter adjusting pipe 4 is screwed with the starting push pipe 9, steel balls are put, and the bolts are tightened, so that the two pipes are combined and installed on the outer diameter of the mandrel pipe 2 at the left side. The expansion pipe 5, the push pipe 14 and the spring ring 11 on the taper surface are combined and installed on the outer diameter of the mandrel pipe 2 in sequence, and then the light shaft is passed through the four-way pipe 23 and inserted into the two holes of the push pipe 14. Finally, the two inner hexagonal flat end self-locking bolts 24 are installed in the screw holes of the push pipe 14.

[0086] As shown in the figure, Figure 4 E and Figure 1 , the I-shaped pull rod 8 is installed between the two pipes, the open pipe 6 is inserted into the outer diameter of the expansion pipe 5 combination, and the positioning bolt 7 is fastened in the screw hole of the mandrel pipe 2 through the corresponding holes of the guide long groove 10 and the open pipe 6, so as to control the open pipe 6 to only expand and shrink radially, and cannot rotate and move axially.

[0087] The calculation steps and formulas of the external expansion force of the pneumatic spring ring mechanical expansion and contraction shaft are as follows:

[0088] According to the size of the inflation pressure P, the primary amplification of the series air cylinder thrust F of the shaft and the total secondary amplification of the spring ring (11) / taper surface mechanical W can be calculated.

[0089] The total thrust of the shaft inner air cylinder is calculated as F.

[0090] F = [0.7854 × (D² - d²) × P] × 3

[0091] In the formula, D is the inner diameter of the main shaft pipe cm

[0092] d is the outer diameter of the piston rod (22) cm

[0093] P is the inflation pressure kg / cm²

[0094] 3 - number of cylinders in series

[0095] . Calculate the mechanical expansion force of the C-ring / taper secondary - w kg

[0096] Because: F = wtg (Ф + a)

[0097] W = f / tg (Ф + a)

[0098] Where: F - total thrust of three cylinders

[0099] a - taper (taper) angle

[0100] Ф - friction angle take tg 5 ° 43 '

[0101] w total - secondary taper expansion force

[0102] The use of the present embodiment and the principle as follows:

[0103] As Figure 1 shown is the pneumatic spring ring mechanical expansion and contraction shaft before the reel tube 16, the shaft inside each tube retraction to be inflated, the starting position of the operation before.

[0104] In the expansion shaft at either end, the reel tube 16 is worn on the outer diameter of the open tube 6, and then the expansion shaft is hung between the two shaft seats on the slitting equipment, and the shaft head is clamped by the positioning reference of the two end tapers inside the shaft head. Head standby.

[0105] Due to the differences in the inner diameter size of the reel tube 16 processing unit and batch, but not every time the inner diameter of each reel tube 16 is the same. According to the size of the gap between the reel tube 16 and the open tube 6, the expansion diameter adjustment tube 4 is screwed, the axial position of the starting tube 9 is adjusted, and the axial position of the combined conical surface 5.2 of the elastic expansion tube 5 is changed, which also changes the size of the spring ring 11 and the outer diameter of the open tube 6. The gap is required to be smaller, and it is appropriate to wear the tube and pull the shaft freely.

[0106] According to the user's requirements for the end face of the reel and the related dimensions of the reel tube 16 end face, according to the distance between the slitting blades, adjust the distance between each reel tube 16.

[0107] According to the thickness of the slitting material, the tension requirement and the size of the reel diameter, the size of the inflation pressure is determined.

[0108] The inflation gun is aimed at the normally closed two-position three-way inflation valve 18. The compressed air flows through the inflation valve 18, enters the inflation hole 13 in the wall of the mandrel pipe 2, and is then divided into three paths, which act on the right chambers of the three pistons 21, respectively. The pistons 21 drive the piston rods 22 and push the push pipe 14 and its expansion pipe 5 combination, the spring ring 11, and the open pipe 6 to tightly expand the reel pipe 16. At the same time, the gas in the left chambers of the three pistons 21 is discharged through the sealing pipe 20 to the outside of the shaft. In this way, the task of one-time expansion of the reel pipe 16 and the secondary expansion of the spring ring 11 / conical mechanical force are completed.

[0109] If it is considered that the quality of the shaft is not good and there is a problem of air leakage, the method of starting the self-locking mechanism is as follows: inflate the inflation valve 18, and then use a No. 6 internal hex wrench to slightly tighten the self-locking bolt 24 in the right rotation direction. When the winding is completed and before the reel is pulled out, loosen the self-locking bolt 24 in the opposite direction, deflate, and then pull out the reel.

[0110] Without using the self-locking bolt 24, in normal backward movement, deflate the inflation valve 18, and at the same time, inflate the sealing pipe 20 with the inflation gun. The compressed air enters another air hole in the wall of the mandrel pipe 2, and is then divided into two paths, which act on the left chambers of the two pistons 21. The pistons 21 push the push pipe 14 to move to the right end of the shaft, and at the same time, the gas in the right chambers of the two pistons 21 is discharged through the inflation valve 18 to the outside of the shaft. At the same time, the self-retraction ability of the spring ring 11 and the open pipe 6, plus the mechanical contraction force of the tension spring acting on the outer diameter of the open pipe, successfully complete the task of retracting the open pipe 6. The operator of the slitting equipment pulls out the reel, and then hangs the two expansion shafts between the two shaft seats of the slitting equipment, and puts on the reel pipe 16 to be clamped and ready for use.

Claims

1. A gas spring coil mechanical expansion and contraction shaft, comprising a mandrel tube (2), the two ends of the mandrel tube (2) are respectively fixed with a driving end shaft head (1) and a working end shaft head (15); characterized in that: The mandrel tube (2) is provided with an expansion front shaft diameter adjusting mechanism, an expansion and contraction mechanism and a push tube (14) from the driving end shaft head (1) to the working end shaft head (15) in sequence, and the mandrel tube (2) is provided with a pneumatic pushing mechanism inside near the push tube (14); the pneumatic pushing mechanism comprises a piston group and a piston rod (22), the piston group comprises a piston (21) and an end cover (12), the end cover (12) is fixedly connected with the mandrel tube (2), one end of the piston rod (22) penetrates through the end cover (12) and is fixedly connected with the piston (21), the other end of the piston rod (22) is connected with the push tube (14) through a connecting piece, the movement of the piston (21) is controlled by corresponding gas circuits, and the pushing of the piston (21) is driven by an inflation valve (18); the expansion front shaft diameter adjusting mechanism, the expansion and contraction mechanism and the push tube (14) are peripherally sleeved with an open tube (6), the open tube (6) is provided with an opening (6.1) penetrating through two ends; and a positioning mechanism is arranged between the open tube (6) and the expansion and contraction mechanism; The expansion and contraction mechanism comprises a plurality of expansion tubes (5) and a plurality of spring rings (11), one end of the expansion tube (5) near the push tube (14) is provided with an end plane (5.6) and an inner ring table (5.7), the other end of the expansion tube (5) away from the push tube (14) is provided with a conical surface (5.2), the conical surface (5.2) of the latter expansion tube (5) is matched with the inner ring table (5.7) of the former expansion tube (5), and the spring ring (11) is installed on the outer periphery of the conical surface (5.2); The expansion front shaft diameter adjusting mechanism comprises an expansion diameter adjusting tube (4) and a starting point push tube (9), the starting point push tube (9) is arranged between the expansion diameter adjusting tube (4) and the expansion and contraction mechanism, one end of the starting point push tube (9) near the expansion and contraction mechanism is provided with a starting point ring table matched with the conical surface (5.2) of the adjacent expansion tube (5), and the other end of the starting point push tube (9) near the expansion diameter adjusting tube (4) is provided with an external thread matched with an internal thread in the inner diameter of the expansion diameter adjusting tube (4).

2. The gas-charged spring coil mechanical expanding and contracting shaft according to claim 1, characterized in that: The inflation valve (18) is arranged on the working end shaft head (15), the mandrel tube (2) is provided with an axial inflation hole (13) at a corresponding position, and the inflation hole (13) is communicated with the inflation valve (18); the working end shaft head (15) is also provided with a sealing tube (20), and the sealing tube (20) on the working end shaft head (15) is communicated with the sealing tube (20) at the corresponding position of the mandrel tube (2); the number of the piston groups is 2-5, the inflation hole (13) is communicated with the space between the pistons (21) and the end covers (12) of the same group, and the sealing tube (20) on the working end shaft head (15) is communicated with the space between the end covers (12) and the pistons (21) of adjacent groups.

3. The gas-charged spring coil mechanical expanding and contracting shaft according to claim 1, characterized in that: One end of the working end shaft head (15) near the piston rod (22) is provided with a groove, the end of the piston rod (22) is located in the groove, the working end shaft head (15) and the mandrel tube (2) are provided with guide long slot holes (19) at corresponding positions on both sides of the groove; the end of the piston rod (22) is provided with a four-way joint (23), the connecting piece is a light shaft (17), the light shaft (17) penetrates through the piston rod (22) and the four-way joint (23), and then is inserted into the holes in the tube walls on both sides of the push tube (14) through the guide long slot hole (19) at the right end of the mandrel tube (2) to be fixed.

4. The gas-charged spring coil mechanical expanding and contracting shaft according to claim 1, characterized in that: The push tube (14) at a position corresponding to the opening of the open tube (6) is provided with a through screw hole, and a self-locking bolt (24) is installed in the through screw hole.

5. The gas-charged spring coil mechanical expanding and contracting shaft according to claim 1, characterized in that: The push tube (14) at one end close to the expansion mechanism is provided with a push cone surface, and a spring ring (11) is sleeved on the outer periphery of the push cone surface.

6. The gas-charged spring coil mechanical expanding and contracting shaft according to claim 1, wherein: The positioning mechanism comprises a positioning bolt (7), the bottom end of the positioning bolt (7) is threadedly connected and fixed to the wall of the mandrel tube (2), the wall of the corresponding expansion tube (5) at the position where the positioning bolt (7) is arranged is provided with a guide long groove (10), the open tube (6) is provided with a through hole at a position corresponding to the positioning bolt (7), and the upper end of the positioning bolt (7) penetrates through the guide long groove (10) and the through hole of the open tube (6).

7. The gas-charged spring coil mechanical expanding and contracting shaft according to claim 1, wherein: The adjacent expansion tubes (5) are provided with I-shaped pull rods (8), the two ends of the expansion tube (5) are respectively provided with a static end T-shaped groove (5.5) and a sliding end T-shaped groove (5.4), the two ends of the I-shaped pull rod (8) are respectively slidably arranged in the sliding end T-shaped groove (5.4) and fixedly arranged in the static end T-shaped groove (5.5), and the adjacent expansion tubes (5) are connected through the I-shaped pull rod (8); the push tube (14) is provided with a sliding end T-shaped groove (5.4), and the push tube (14) and the adjacent expansion tube (5) are provided with an I-shaped pull rod (8), the two ends of the I-shaped pull rod (8) are respectively slidably arranged in the sliding end T-shaped groove (5.4) of the push tube (14) and fixedly arranged in the static end T-shaped groove (5.5) of the expansion tube (5).

8. The gas-charged spring coil mechanical expanding and contracting shaft according to claim 1, characterized in that: The I-shaped pull rod (8) is arranged between the starting push tube (9) and the adjacent expansion tube (5), the starting push tube (9) is provided with a static end T-shaped groove (5.5), and the two ends of the I-shaped pull rod (8) are respectively slidably arranged in the sliding end T-shaped groove (5.4) of the expansion tube (5) and fixedly arranged in the static end T-shaped groove (5.5) of the starting push tube (9).

9. The gas-charged spring coil mechanical expanding and contracting shaft according to claim 1, characterized in that: The cross section of the spring ring (11) is circular or polygonal.

10. The gas-charged spring coil mechanical expanding and contracting shaft according to claim 1, characterized in that: The open tube (6) is provided with a plurality of tension springs (25) which are installed in the hook holes symmetrical to the opening and are contracted in the opening (6.1).

Images