CN201254413Y

CN201254413Y - Mechanical expansion shaft

Info

Publication number: CN201254413Y
Application number: CNU2008201520785U
Authority: CN
Inventors: 付瑞英; 孙继光; 苏彭恩; 黄真辉
Original assignee: SHANGHAI WANGXUN NEW MATERIAL CO Ltd
Current assignee: SHANGHAI WANGXUN NEW MATERIAL CO Ltd
Priority date: 2008-08-18
Filing date: 2008-08-18
Publication date: 2009-06-10
Anticipated expiration: 2018-08-18

Abstract

The utility model relates to a mechanical dilatation shaft which comprises a core shaft and dilatation shaft support plates, wherein the middle part of the core shaft is symmetrically provided with two segments of outside threads rotation directions of which are opposite; dilatation shaft screws are respectively sleeved on the outside threads; the inner walls of the dilatation shaft screws are inside threads, the outer wall has an awl-post-shaped lug boss structure, and the outer wall is provided with a plurality of inclined sliding mechanisms; the dilatation shaft support plates are fixed on the outer side of the two inclined sliding mechanisms; the plurality of dilatation shaft support plates moves around the core shaft to form the column-shaped outer wall; a side sliding block is fixed on the end part of each dilatation shaft support plate; the end part of the core shaft is provided with two baffle plates; a rolling bearing is clamped in an inner bearing chamber of the baffle plate; a thrust force ball bearing is clamped in an outer bearing chamber; the outer side of the thrust force ball bearing is provided with a bearing seat sleeve which is fixed on the core shaft through a locking sleeve; a pull pin is fixed on the outer side of the baffle plate; the inner side of the baffle plate is provided with a radial side sliding block trough; and a side sliding block is clamped in the side sliding block trough in a movable mode. The mechanical dilatation shaft has the advantages of simple structure, convenient operation and wide application area.

Description

Mechanical expansion shaft

Technical Field

The utility model relates to an axle, especially a mobilizable mechanical type inflation axle. The utility model discloses on the basis of current axle that expands, make full use of mechanical principle has realized the preparation and the application of the axle that expands under the simple structure.

Background

For large and heavy foils, a fixed cantilever expansion shaft (hydraulic or pneumatic) is usually adopted for uncoiling (unreeling) and reeling (reeling) of a coil material, the position of the expansion shaft is unchanged, and a large coil of the coil material is fed onto the expansion shaft by other modes or device mechanisms, so that the large coil of the coil material is very complex and high in cost.

The utility model patent that has patent number 02265497.6 who involves the expansion axle among the prior art "expansion axle", this type of expansion axle mainly includes outer axle sleeve, flexible piece and telescopic machanism, and wherein telescopic machanism includes pull rod, adjusting nut, is equipped with circular cone inclined plane on the pull rod, and the one end of pull rod is equipped with the regulation external screw thread, and the pull rod is located outer axle sleeve and is driven the relative outer axle sleeve axial of pull rod by adjusting nut and slides, and the fulcrum of flexible piece bottom is located near the circular cone inclined plane of pull rod. The expansion shaft is mainly applied to soft package winding drum materials, in particular to paper processing equipment for papermaking and the like. For small and light foils, an air expansion shaft and an optical axis (with a taper sleeve or a chuck) are usually adopted for uncoiling (uncoiling) and coiling (coiling) of coiled materials, so that the foil is very convenient, but cannot bear heavy load.

In the prior art, a hydraulic expansion shaft is required to be provided with a movable hydraulic pump station, and an oil cylinder is arranged in the expansion shaft, so that the expansion shaft is large in size, large in maintenance amount, easy to leak and pollute and poor in reliability.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the not enough of existence among the above-mentioned prior art, provide a mobilizable mechanical expansion axle. Utilize the utility model discloses a mechanical expansion axle realizes the inflation and the shrink of footpath through the mechanical force, at mechanical expansion axle simple structure, small, the load is big, on safe and reliable and convenient operation's basis, makes the inconsistent occasion of inside and outside footpath of each coiled material of its special adaptation greatly roll up, does not receive the restriction of job site or goods yard yet.

Based on the above-mentioned purpose, the utility model provides a following technical scheme:

a mechanical expansion shaft comprises a mandrel and expansion shaft supporting plates, wherein a square block is arranged at one end of the mandrel, two external threads with opposite rotating directions are symmetrically arranged in the middle of the mandrel, an expansion shaft nut is sleeved on each external thread, the two expansion shaft nuts are symmetrically arranged, the expansion shaft nut is integrally of a frustum-shaped structure, internal threads corresponding to the external threads on the mandrel are arranged on the inner wall of the expansion shaft nut, a plurality of inclined sliding mechanisms capable of inclining on the expansion shaft nut are arranged on the outer wall of the expansion shaft nut, arc-shaped sheet-shaped expansion shaft supporting plates are fixed on the outer sides of the inclined sliding mechanisms, each expansion shaft supporting plate is longitudinally fixed on the inclined sliding mechanisms on the two expansion shaft nuts respectively, the plurality of expansion shaft supporting plates form a cylindrical outer wall around the mandrel, side sliding blocks are fixed at the end parts of the two ends of each expansion shaft supporting plate respectively, and two rolling bearings are sleeved at the end parts of the expansion shaft, the rolling bearings are respectively clamped in the inner bearing chambers of the baffles, the outer bearing chamber of each baffle is respectively clamped with a thrust ball bearing, the outer side of each thrust ball bearing is provided with a thrust ball bearing sleeve, the outer side of each thrust ball bearing sleeve is fixed on the mandrel through a locking nut, the outer side of each baffle is fixed with at least one pulling pin, the inner side of each baffle is provided with a radial side sliding block groove, and each side sliding block is movably clamped in the corresponding side sliding block groove.

As a preferable scheme, the structure of the inclined sliding mechanism is as follows: the outer wall of the expansion shaft screw is provided with a plurality of inclined convex ribs forming acute angles with the axis of the expansion shaft screw, a pressing plate with the width larger than that of each inclined convex rib is fixed on each inclined convex rib, the cross section of each inclined convex rib and the pressing plate after combination is in a T shape, an inclined block with an inclined angle is fixed on the outer side of each pressing plate, the surface of the outer wall of each inclined block is parallel to the axis of the mandrel, the outer wall of each inclined block is fixed with the expansion shaft supporting plate through bolts, the side walls of the two sides of each inclined block are respectively fixed on a slide with an L-shaped cross section, and the bottom of each slide is clamped at the lower end of each pressing plate and can slide longitudinally.

As another preferable scheme, the structure of the inclined sliding structure is as follows: the outer wall of the expansion shaft nut is provided with a plurality of inverted T-shaped grooves, the bottoms of the inverted T-shaped grooves and the axis of the expansion shaft nut form acute angles, an inclined block with an inverted T-shaped cross section is clamped in each inverted T-shaped groove, the outer wall of the inclined block clamped in each inverted T-shaped groove is parallel to the axis of the expansion shaft nut, and the outer wall of each inclined block is fixed with the expansion shaft support plate.

Aiming at the prior art, the technical scheme brings the following technical effects:

firstly, because the utility model adopts the structure of the lead screw and the oblique block, the expansion and the contraction of the diameter enclosed by the supporting plate are realized through the relative rotation of the mandrel and the supporting plate, and the utility model has the advantages of simple structure and convenient operation;

second, to in fixed expansion shaft, the utility model discloses an expansion shaft uses with open-close type bearing frame combination, can realize that expansion shaft and coil of strip spare remove simultaneously, only need hang wire rope and draw this expansion shaft of wearing in coil of strip spare can realize the position and shift, and convenient light and handy, the practicality is strong.

Drawings

Fig. 1 is a longitudinal sectional view of the mechanical expansion shaft of the present invention.

Fig. 2 is a cross-sectional view of the mechanical expansion shaft of the present invention.

Fig. 3 is a schematic structural view of a baffle plate in embodiment 1 of the mechanical expansion shaft of the present invention.

Fig. 4 is a schematic structural view of an expansion shaft nut in embodiment 1 of the mechanical expansion shaft of the present invention.

Fig. 5 is a schematic structural view of a swash block in embodiment 1 of the mechanical expansion shaft of the present invention.

Fig. 6 is a schematic structural view of a left slideway and a right slideway in embodiment 1 of the mechanical expansion shaft of the invention.

Fig. 7 is a schematic structural view of a side slide block in embodiment 1 of the mechanical expansion shaft of the present invention.

Fig. 8 is a schematic structural view of a positioning bearing sleeve in embodiment 1 of the mechanical expansion shaft of the present invention.

Fig. 9 is a schematic structural view of a bearing housing according to embodiment 1 of the mechanical expansion shaft of the present invention.

Fig. 10 is a schematic structural view of a positioning bearing lower seat body in embodiment 1 of the mechanical expansion shaft of the present invention.

Fig. 11 is a schematic structural view of a positioning bearing seat upper cover in embodiment 1 of the mechanical expansion shaft of the present invention.

Fig. 12 is a schematic structural view of a mandrel according to embodiment 1 of the mechanical expansion shaft of the present invention.

Fig. 13 is a schematic structural view of an expansion shaft support plate in embodiment 1 of the mechanical expansion shaft of the present invention.

Fig. 14 is a schematic structural view of a pressing plate in embodiment 1 of the mechanical expansion shaft of the present invention.

Fig. 15 is a schematic structural view of a dog clutch fixed end in embodiment 1 of the mechanical expansion shaft of the present invention.

Wherein,

3-baffle plate 4-expanded shaft nut 5-oblique block, 6-left slideway 6' -right slideway 7-side sliding block 8-positioning bearing sleeve 9-bearing sleeve 10-positioning bearing seat lower seat body 11-positioning bearing seat upper cover 12-core shaft 13-expanded shaft supporting plate 14-pressing plate 15-clutch fixed end 20-shaft end pressing plate 21-countersunk screw 22-bearing pressing cover (one) 23-positioning bearing seat rolling bearing 24-bearing pressing cover (two) 25-set screw 26-locking nut 27-locking sleeve 28-positioning screw 29-fixing screw 30-adjusting sleeve 31-fixing screw 32-fixing screw 33-fixing screw 34-coiled material inner diameter or material rolling bearing 35-36-spacer sleeve 37-thrust ball bearing 38-thrust ball bearing seat sleeve 39-plate movable pin 40-bearing seat lower seat body 41-bearing seat upper seat body 42-isolating ring 43-shaft baffle seat body ring 44-bearing seat lower seat body Screw hole 2.9-frame body 3.1-inner bearing chamber 3.2-outer bearing chamber 3.3-plate moving pin fixing hole 3.5-baffle vertical face outer diameter 3.6-side slide block groove 3.7-baffle inner face 4.1-expanding shaft screw nut inner screw thread 4.2-sliding groove right side vertical face 4.3-expanding shaft screw nut hub 4.4-expanding shaft screw nut boss pressing plate combining face 4.5-expanding shaft screw nut small end plane 4.6-expanding shaft screw nut pressing plate combining screw hole 4.7-sliding groove left side vertical face 5.1-inclined block large end vertical face 5.2-inclined block upper plane screw hole 5.3-inclined block left and right side vertical face screw hole 5.4-inclined block upper plane 5.5-inclined block side vertical face 5.6-inclined block lower inclined plane 6.1-inclined block face 6.2-left side vertical face 6.3-empty 6.4-upper plane 6.5-inclined block side slide block side vertical face slide block lower inclined plane slide block through hole slide block 7.7.7-inclined block slide block through hole vertical face 5.7.7-inclined slide block through hole vertical face 5.7.7 7.7 of surface, 8.1 of closing surface of slide block, 8.2 of side end surface of positioning bearing sleeve, 8.3 of inner diameter bearing chamber of positioning bearing sleeve, 8.3 of outer diameter of positioning bearing sleeve, 8.4 of outer diameter of positioning bearing sleeve, 8.5 of outer diameter boss of positioning bearing sleeve, 9.1 of closing threaded hole of end surface of positioning bearing sleeve, 9.2 of side end surface of bearing sleeve, 9.3 of closing threaded hole of end surface of bearing sleeve, 9.4 of inner diameter bearing chamber of bearing sleeve, 10.1 of outer diameter of bearing sleeve, 10.2 of positive vertical surface of hinge boss of lower seat body of positioning bearing, 10.3 of side vertical surface of hinge boss of lower seat body of positioning bearing, 10.4 of hinge pin hole of lower seat body of positioning bearing, 10.5 of closing plane of upper seat body of lower seat body of positioning bearing, 10.6 of bearing chamber of lower seat body of positioning bearing, 10.7 of lower seat body of positioning bearing, 10.8 of lower seat body of positioning bearing, 10.9 of fixing threaded hole of fixing bolt of lower seat body of positioning bearing seat body, 10.9 of positioning bearing seat body of positioning bearing sleeve, 10.6 of positioning bearing sleeve, and 10.1 of positioning bearing sleeve 11.2 parts of the inner side surface of a chain groove, 11.3 parts of a hinge pin hole of an upper cover of a positioning bearing, 11.4 parts of a side vertical surface of the upper cover of the positioning bearing, 11.5 parts of an upper cover of the positioning bearing, 11.6 parts of a positioning groove of the upper cover of the positioning bearing, 11.7 parts of a bearing chamber of the upper cover of the positioning bearing, 12.1 parts of a lower closing plane of the upper cover of the positioning bearing, 12.2 parts of a threaded hole of a shaft end pressing plate of a mandrel, 12.3 parts of a positioning key groove for a clutch of the sliding end of the mandrel, 12.4 parts of a bearing position for a bearing seat of the mandrel, 12.5 parts of a left-right-rotation screw rod 12.7 part and 12.7 parts of a vertical surface of the mandrel, 12.8 parts of a hollow groove of the left-right-rotation screw rod 13.1 parts of a square block of the mandrel, 13.2 parts of a vertical surface of an end of an expanding shaft supporting plate, 13.3 parts of a fixing screw hole for a sliding block, 13.4 parts of an upper end of an expanding shaft supporting plate, 14.4 parts of a fixing hole of a fixing screw rod 14.5-lower plane of pressure plate 15.1-outer diameter of fixed end of clutch 15.2-groove of fixed end of clutch 15.3-outer surface of inner sleeve of fixed end of clutch 15.4-inner diameter hole of fixed end of clutch 15.5-keyway of fixed end of clutch 15.6-fixed end of clutch screw hole 15.7-plane of fixed end of clutch 15.8-groove of fixed end of clutch 15.9-outer surface of fixed end of clutch

Detailed Description

The mechanical expansion shaft of the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments, but the scope of the invention is not limited thereby.

The utility model provides a structure of mechanical expansion axle please see figure 1 and figure 2, figure 1 is the utility model discloses a vertical section view of mechanical expansion axle, figure 2 is the utility model discloses a horizontal section view of mechanical expansion axle. According to the drawing, the utility model discloses a mechanical expansion shaft, primary structure include dabber 12 and bloated axle backup pad 13, and the one end of dabber 12 is equipped with square piece, twists this square piece with the spanner and rotates in order to drive dabber 12, and dabber 12 middle part symmetry is equipped with two sections opposite direction of rotation, each other is the external screw thread of symmetry, is equipped with one respectively on each external screw thread and revolves to the same bloated axle screw 4 with the external screw thread. When the mandrel 12 rotates, the outer sides of the expansion shaft nuts 4 are fixed, the expansion shaft nuts 4 do not rotate along with the mandrel 12, and then the two expansion shaft nuts 4 move inwards or outwards simultaneously.

The outer wall of the expansion shaft nut 4 is provided with a plurality of inclined sliding mechanisms which can slide on the expansion shaft nut 4, the outer side of each inclined sliding mechanism is fixed with an arc-shaped sheet-shaped expansion shaft support plate 13, each expansion shaft support plate 13 is longitudinally fixed on the inclined sliding mechanisms on the two expansion shaft nuts 4, and the plurality of expansion shaft support plates 13 form a cylindrical outer wall around the mandrel 12.

The end parts of the two ends of each expansion shaft supporting plate 13 are respectively fixed with a side sliding block 7, the mandrel 12 at the end part of each expansion shaft supporting plate 13 is respectively provided with a symmetrical adjusting sleeve 30, and the adjusting sleeves 30 are used for adjusting the distance between the two baffles 3 on the mandrel 12 to be adaptive to the length of the expansion shaft supporting plates 13. The outer side of the adjusting sleeve 30 is provided with a rolling bearing 35 and a thrust ball bearing 37, the baffle plate 3 is clamped between the rolling bearing 35 and the thrust ball bearing 37, the rolling bearing 35 is clamped in an inner bearing chamber of the baffle plate 3, the thrust ball bearing 37 is clamped in an outer bearing chamber of the baffle plate 3, a thrust ball bearing sleeve 38 is arranged on the outer side of the thrust ball bearing 37, the outer side of the thrust ball bearing sleeve 38 is fixed on the mandrel 12 through a locking sleeve 27 and a positioning screw 28, the outer side of the baffle plate 3 is fixed with at least one pulling pin 39, the inner side of the baffle plate 3 is provided with a radial side slide block groove, and the side slide block 7 is clamped in the side slide block groove and can move radially in the side slide block groove. Through the structure, the expansion shaft supporting plate 13 can be clamped between the two baffle plates 3, and the expansion shaft supporting plate 13 can radially slide in the side sliding block groove of the baffle plate 3 through the rotation of the mandrel 12, so that the expansion and reduction of the diameter of the expansion shaft are realized.

In order to prevent the expanding shaft support plate 13 from rotating together when the mandrel 12 rotates, the outer side of the baffle plate 3 is provided with a pulling pin 39, a long-handle wrench is sleeved on the pulling pin 39, so that the baffle plate 3 is fixed and does not rotate through the long-handle wrench, and the expanding shaft support plate 39 does not rotate along with the rotation of the mandrel 12. When the mandrel 12 rotates, the expansion shaft nut 4 and the expansion shaft supporting plate 12 are fixed together and do not rotate, and the expansion shaft nut 4 does linear motion at the external thread generatrix of the mandrel 12. The linear motion direction of the expansion shaft nut 4 is changed simultaneously when the rotation direction of the mandrel 12 is changed, and the linear displacement of the expansion shaft nut 4 changes the external diameter of the expansion shaft, so that the expansion and reduction of the diameter of the expansion shaft are realized.

The expansion shaft nut 4 has the following structure: the outer wall of the expansion shaft nut 4 is in a conical column structure, one end of the expansion shaft nut is large in diameter, and the other end of the expansion shaft nut is small in diameter; the inner wall of the expansion shaft nut 4 is provided with internal threads (left and right) corresponding to the external threads on the mandrel 12. The two expansion nut screws 4 are symmetrically arranged on the mandrel 12, that is, the two ends with larger diameters are outward at the same time, or the two ends with larger diameters are inward at the same time, so that when the mandrel 12 rotates, the two expansion nut screws 4 which are symmetrically arranged expand towards the two ends of the mandrel 12 at the same time, or contract towards the center of the mandrel 12 at the same time.

The arrangement of the left-right-hand external thread directions which are symmetrical to each other in the mandrel 12 is related to the stress direction of the outer diameter wall of the expansion shaft, (namely, the uncoiling direction or the coiling direction, or the active uncoiling or the passive uncoiling.) the external force direction is opposite to the stress direction of the mandrel, and the expansion shaft nut 4 moves towards the center of the mandrel 12 after the external force is applied, so that the expansion state is kept.

The method for hoisting the steel coil by using the mechanical expansion shaft comprises the following steps:

firstly, rotating a core shaft 12 of a mechanical expansion shaft to reduce the outer diameter of a cylindrical body surrounded by a plurality of expansion shaft supporting plates 13, and penetrating the mechanical expansion shaft into an inner hole of a coiled material;

secondly, a long-handle wrench with double sleeve holes at the end part is sleeved on the wrenching pin 39, and then a square-hole wrench with a square hole is sleeved on the square block;

keeping the long handle spanner immovable, rotating the square hole spanner to make the mandrel 12 rotate and the expanding shaft support plate 13 immovable, so that the diameter of the outer wall of the mandrel is increased until the inner hole of the coiled material piece is tightly pressed;

and fourthly, using a lifting device with double lifting ropes, wherein the lifting ropes are respectively arranged at two ends of the mandrel 12, and lifting and pulling the coiled material to a working area.

Example 1

The utility model discloses a concrete embodiment of mechanical expansion shaft, as shown in fig. 1 and fig. 2, fig. 1 is the utility model discloses a vertical section view of mechanical expansion shaft, fig. 2 is the utility model discloses a horizontal section view of mechanical expansion shaft. As can be seen from the figure, the main structure is as follows:

mechanical expansion shaft in this embodiment, including dabber 12 and bloated axle backup pad 13, the one end of dabber 12 is equipped with square piece, dabber 12 middle part symmetry is equipped with two sections external screw threads opposite in direction of rotation, it has one bloated axle screw 4 to overlap respectively on each external screw thread, 4 outer walls of bloated axle screw are awl column boss structure, the inner wall is equipped with the internal thread that corresponds with dabber 12 last external screw thread, two bloated axle screws 4 are the outside symmetry setting of big conical head, the outer wall of bloated axle screw 4 is equipped with a plurality of can incline slide mechanism on bloated axle screw 4. Arc-shaped sheet-shaped expansion shaft support plates 13 are fixed on the outer side of the inclined sliding mechanism, each expansion shaft support plate 13 is longitudinally fixed on the inclined sliding mechanism on the two expansion shaft nuts 4, the six expansion shaft support plates 13 surround the mandrel 12 to form a cylindrical outer wall, the end parts of the two ends of each expansion shaft support plate 13 are respectively fixed with a side slide block 7, the end parts of the two ends of the expanding shaft supporting plate 13 on the mandrel 12 are respectively sleeved with a rolling bearing 35, the rolling bearings 35 are clamped in the inner bearing chamber of the baffle plate 3, the outer bearing chamber of the baffle plate 3 is clamped with a thrust ball bearing 37, the outer side of the thrust ball bearing 37 is provided with a thrust ball bearing sleeve 38, the outer side of the thrust ball bearing sleeve 38 is fixed on the mandrel 12 through a locking nut, the outer side of the baffle plate 3 is fixed with at least one pulling pin 39, the inner side of the baffle plate 3 is provided with a radial side slide block groove, and the side slide block 7 is movably clamped in the side slide block groove.

The structure of the mandrel in this embodiment is shown in fig. 12, and fig. 12 is a schematic structural view of the mandrel in embodiment 1 of the mechanical expansion shaft of the present invention. As can be seen from the figure, the main structure of the mandrel 12 is two segments of external threads symmetrically arranged at the center, and the external threads form a left-handed lead screw 12.6 for the mandrel expansion nut and a right-handed lead screw 12.6' for the mandrel expansion nut at the center of the mandrel. For processing requirements, a mandrel left-handed screw empty groove 12.7 and a mandrel right-handed screw empty groove 12.7' are arranged between two sections of screw rods, each section of screw rod is matched with an expansion shaft nut 4, a mandrel end pressure plate threaded hole 12.1 is arranged at the end part of a mandrel 12, a countersunk screw 21 is screwed in the mandrel end pressure plate threaded hole 12.1 to fix a shaft end pressure plate 20 at the end part of the mandrel 12, a clutch fixed end 15 is fixed on the mandrel 12 through a shaft end pressure plate 20 and a mandrel sliding end clutch positioning key 12.2, a mandrel bearing seat bearing position 12.3 is used for placing two positioning bearing seat rolling bearings 23 of the positioning bearing seat, a mandrel locking nut thread 12.4 is arranged on the mandrel 12 for matching with a locking nut 26, a mandrel baffle plate bearing position 12.5 is arranged on the mandrel 12 for matching with a rolling bearing 35 and a thrust 37 on two sides of the baffle plate 3, a ball bearing seat for a mandrel baffle plate is arranged at the other end part of the mandrel 12 is a, the square mandrel block 12.8 is twisted by a wrench to drive the mandrel 12 to rotate.

The expansion shaft nut structure in this embodiment is as shown in fig. 4, and fig. 4 is a structural schematic diagram of the expansion shaft nut in the mechanical expansion shaft of the present invention. As can be seen from the figure, the nut for expanding the shaft is in a frustum-shaped structure, the inner screw thread 4.1 of the nut for expanding the shaft is arranged in the middle of the nut for expanding the shaft, and the nut for expanding the shaft 4 can be screwed on the left-handed screw 12.6 for the nut for expanding the shaft of the mandrel 12 and the right-handed screw 12.6' for the nut for expanding the shaft of the mandrel through the inner screw thread 4.1 of the nut for expanding the shaft. Six bosses are arranged on the expansion shaft nut 4, and the boss pressing plate of the expansion shaft nut on the boss forms an angle of 30 degrees between the combined surface 4.4 and the axis of the expansion shaft nut 4. The bottom of the boss is provided with an expansion shaft nut hub 4.3, and an expansion shaft nut boss pressing plate on the boss is close to a right side vertical surface 4.2 of the sliding chute and a left side vertical surface 4.7 of the sliding chute of the combined surface 4.4. Three expansion shaft screw nut pressing plates are arranged on the expansion shaft screw nut pressing plate closing surface 4.4 of the boss to close screw holes 4.6, the pressing plate 14 can be fixed on the boss through three fixing screws 32, and the boss fixed with the pressing plate 14 is of a T-shaped structure when seen in the longitudinal direction because the width of the pressing plate 14 is larger than that of the boss. In the present embodiment, the small end of the expansion shaft nut 4 faces inwards, i.e. the small end planes 4.5 of the expansion shaft nuts of the two expansion shaft nuts 4 are opposite.

The structure of the pressing plate in this embodiment is shown in fig. 14, and fig. 14 is a schematic structural view of the pressing plate in embodiment 1 of the mechanical expansion shaft of the present invention. As can be seen from the figure, the pressing plate 14 is a cuboid, the upper plane 14.3 of the pressing plate is provided with a fixing bolt hole 14.2 for a pressing plate expansion shaft nut, the pressing plate 14 is fixed on the boss through three fixing bolts 32, and the lower plane 14.5 of the pressing plate is in contact with the pressing plate handle 4.4 of the boss of the expansion shaft nut. The pressure plate end vertical inclined plane 14.1 is aligned with the small end plane 4.5 of the expansion shaft nut, the distance between two opposite pressure plate side vertical planes 14.4 is the width of the pressure plate 14, and the width is larger than the width of the boss, so the boss fixed with the pressure plate 14 is in a T-shaped structure when seen in the longitudinal direction.

The inclined sliding mechanism in the embodiment comprises a boss on an expansion shaft nut, a pressing plate 14, a left slideway 6, a right slideway 6' and an inclined block 5. The left slideway 6 and the right slideway 6' are respectively fixed at two sides of the sloping block 5. The bottoms of the left slideway 6 and the right slideway 6 'are hooked on a T-shaped structure formed by the pressing plate 14 and bosses on the expansion shaft screw nut, and the left slideway 6, the right slideway 6' and the oblique block 5 can move relative to the T-shaped structure.

The structure of the slideway is shown in fig. 6, and fig. 6 is a schematic structural view of the left and right slideways in embodiment 1 of the mechanical expansion shaft of the present invention. The left and right slideways have the same structure, are approximately L-shaped in the longitudinal direction and are trapezoidal in the transverse direction. The L-shaped protruding part is a slideway inclined block surface 6.1, and a slideway left vertical surface 6.2 is vertically connected with the L-shaped protruding part. The angle between the ramp upper plane 6.4 and the ramp lower sloping plane 6.6 is 30 degrees. In order to meet the requirement of slide machining, a clearance groove 6.3 is arranged between a slide inclined block surface 6.1 and a slide left vertical surface 6.2, a slide side vertical surface screw through hole 6.5 is arranged on the slide, and the left slide 6 and the right slide 6' are fixed on two sides of an inclined block 5 through fixing screws 33.

The structure of the sloping block 5 is shown in fig. 5, and fig. 5 is a schematic structural view of the sloping block in embodiment 1 of the mechanical expansion shaft of the present invention. As can be seen from the figure, the inclined block 5 is of a trapezoid structure, an included angle of 30 degrees is formed between a lower inclined plane 5.6 of the inclined block on the inclined block 5 and an upper plane 5.4 of the inclined block, the included angle is the same as that between an upper plane of a boss on the expansion shaft nut 4 and an axis, and after the inclined block 5 is placed on the pressing plate 14, the lower inclined plane 5.6 of the inclined block is in contact with an upper plane 14.3 of the pressing plate 14. The big end vertical surface 5.1 of the swash block faces to the central position of the mandrel 12, so that the upper plane 5.4 of the swash block is parallel to the axis of the mandrel 12. The inclined block 5 is combined with the left slideway 6 and the right slideway 6' and clamped on the combination body of the boss and the pressing plate. The oblique block side elevation 5.5 is provided with oblique block left and right side elevation screw holes 5.3, the slideway is provided with slideway side elevation screw through holes 6.5, and the left slideway 6 and the right slideway 6' are fixed on two sides of the oblique block 5 by fixing screws 33 through the screw holes. The inclined block 5 needs to be fixed with the expansion shaft support plate 13, and the expansion shaft support plate is screwed into the inclined block upper plane screw hole 5.2 through a fixing screw 31.

In this embodiment, the expansion shaft support plate 13 is fixed to the oblique sliding mechanism, six expansion shaft support plates 13 enclose an outer diameter of the mechanical expansion shaft, and after the expansion shaft support plate 13 and the oblique sliding mechanism are fixed into a whole, the increase or decrease of the radius enclosed by the expansion shaft support plate 13 is realized by the opposite movement of the two expansion shaft nuts 4. The concrete structure of the expansion shaft support plate 13 is shown in fig. 13, and fig. 13 is a schematic structural view of the expansion shaft support plate in embodiment 1 of the mechanical expansion shaft of the present invention. As can be seen from the figure, the vertical surface 13.1 of the end of the support plate of the expansion shaft is in a spherical crown structure, the upper cambered surface 13.3 of the support plate of the expansion shaft is arranged on the vertical surface, the side part of the support plate of the expansion shaft is a side vertical surface 13.5 of the support plate of the expansion shaft, the vertical surface 13.1 of the end of the support plate of the expansion shaft is close to the baffle plate 3 after the support plate of the expansion shaft is arranged on the mechanical expansion shaft, and the upper cambered surface. Six fixing through holes 13.4 for the inclined blocks of the expansion shaft supporting plate are formed in the upper arc surface 13.3 of the expansion shaft supporting plate and are divided into two groups, each group of three fixing through holes 13.4 for the inclined blocks of the expansion shaft supporting plate is fixed on one inclined block 5 through the three fixing through holes 13.4 for the inclined blocks of the expansion shaft supporting plate, and each expansion shaft supporting plate is fixed on two inclined blocks 5. Two fixing screw holes 13.2 for the sliding blocks of the expansion shaft supporting plate are arranged at the end parts of the two ends of the expansion shaft supporting plate 13 and close to the vertical surface 13.1 of the end of the expansion shaft supporting plate for fixing the side sliding blocks 7.

When the mechanical expansion shaft works, the expansion shaft support plate 13 needs to be kept relatively fixed and does not rotate along with the mandrel 12. It is necessary to fit the expansion shaft support plate 13 into the baffle 3 so that it can move radially along the baffle 3. In this embodiment, the side slider 7 is provided at the end of the expansion shaft support plate 13. The structure is shown in fig. 7, and fig. 7 is a schematic structural view of a side sliding block in embodiment 1 of the mechanical expansion shaft of the present invention. As can be seen from the figure, the side slider 7 is provided with a slider fastening screw passing hole 7.2, and the side slider 7 is fixed to the end of the expansion shaft support plate 13 by passing a fixing screw 29 through the slider fastening screw passing hole 7.2 and the expansion shaft support plate slider fastening screw hole 13.2. The slider bosses of the side sliders 7 protrude out of the end of the expansion shaft support plate 13 and extend into the side slider grooves 3.6 in the baffle plate 3. The slide block boss is enclosed by a slide block boss side vertical surface 7.4 and a slide block boss vertical plane 7.5, the slide block side surface 7.3 is close to the inner surface 3.7 of the baffle plate, and the slide block handle combined surface 7.7 is contacted with the lower plane of the expansion shaft supporting plate 13. The upper slide plane 7.6 faces the spindle 12. Two side sliding blocks 7 are fixed on each expansion shaft supporting plate 13 and are distributed at two ends of each expansion shaft supporting plate 13.

The baffle 3 is fixed on the mandrel 12 near the mandrel baffle bearing position 12.5 at the two ends and does not rotate along with the mandrel 12. The structure of the baffle 3 is shown in fig. 3, and fig. 3 is a schematic view of the baffle structure in the mechanical expansion shaft of the present invention. As can be seen, the baffle 3 is a circular wall structure, the inner surface 3.7 of the baffle at the inner side is provided with a side slide slot 3.6, and two pulling pins 39 are fixed at the outer side. The side sliding block grooves 3.6 are symmetrically distributed along the radial direction of the baffle plate 3, and the number of the side sliding block grooves 3.6 is six and is the same as that of the expansion shaft supporting plates 13. A pulling pin 39 is arranged at the position close to the circumference of the baffle plate 3, and one end of the pulling pin 39 is provided with external threads which can be screwed into a plate moving pin fixing hole 3.3 on the baffle plate 3. Two bearing chambers are arranged at the circle center of the baffle plate 3, an inner bearing chamber 3.1 with a slightly larger radius is arranged close to the inner surface 3.7 of the baffle plate, and an outer bearing chamber 3.2 with a slightly smaller radius is arranged opposite to the inner bearing chamber. Wherein, a part of rolling bearings 35 are embedded in the inner bearing chamber 3.1, and a part of thrust ball bearings 37 are embedded in the outer bearing chamber 3.2. The rolling bearing 35 and the thrust ball bearing 37 are respectively fixed on the mandrel 12, and the positions of the rolling bearing and the thrust ball bearing are 12.5 bearing positions for a mandrel baffle plate. The baffle 3 is clamped in the middle by the rolling bearing 35 and the thrust ball bearing 37, so that the position of the baffle 3 is relatively fixed on the mandrel 12 and does not rotate along with the mandrel 12. The outer diameter of the baffle vertical surface 3.5 is the maximum diameter which can be enclosed by the expansion shaft support plate 13. After the baffle 3 is fixed on the mandrel 12 by the bearing, the inner surface 3.7 of the baffle faces the middle part of the mandrel 12, and the pulling pin 39 on the baffle 3 faces the end part of the mandrel 12. In order to adjust the distance between the two baffles 3 on the mandrel 12, an adjusting sleeve 30 is arranged on the inner side of the inner rolling bearing 35 of the baffle 3, the outer end of the adjusting sleeve 30 abuts against the inner side of the rolling bearing 35, and the inner end of the adjusting sleeve 30 abuts against a step on the outer side of the screw rod.

The utility model discloses an one of the advantages of machinery axle that expands can freely remove, will expand axle shift position as required. In order to realize the movable function of the mechanical expansion shaft, two positioning bearings are arranged on the mandrel of the mechanical expansion shaft and distributed at two ends of the mandrel 12. Wherein, be close to square piece 12.8 one end location bearing and be located dabber bearing frame and use bearing position 12.3 department, this department location bearing's structure is: two side-by-side positioning bearing seat rolling bearings 23 are arranged in the bearing position 12.3 for the mandrel bearing seat, a spacer ring 42 is arranged between the two positioning bearing seat rolling bearings 23, a shaft retainer ring 43 is arranged at the step of the outer positioning bearing seat rolling bearing 23 and the bearing position 12.3 for the mandrel bearing seat, a bearing sleeve 9 is sleeved on the outer circumference of the positioning bearing seat rolling bearing 23, a bearing gland (I) 22 and a bearing gland (II) 24 are respectively arranged on two sides of the bearing sleeve 9, and the three are fixed through a set screw 25, so that the two positioning bearing seat rolling bearings 23 are positioned in the peripheries of the bearing sleeve 9, the bearing press plate (I) 22 and the bearing press plate 24. The structure of the bearing sleeve 9 is shown in fig. 9, and fig. 9 is a schematic structural view of the bearing sleeve in embodiment 1 of the mechanical expansion shaft of the present invention. As can be seen from the figure, the bearing sleeve 9 is a cylindrical structure, the outer diameter 9.4 of the bearing sleeve 9 is the outer circular wall of the bearing sleeve, and the inner circle of the bearing sleeve is a bearing sleeve inner diameter bearing chamber 9.3. The positioning bearing seat rolling bearing 23 can be placed in the bearing sleeve inner diameter bearing chamber 9.3, and the bearing sleeve outer diameter 9.4 is contacted with the inner circular walls of the bearing seat lower seat body 40 and the bearing seat upper seat body 41. The bearing sleeve end face handle threaded holes 9.2 are uniformly arranged on the two bearing sleeve side end faces 9.1 of the bearing sleeves, and fastening screws 25 are screwed in the bearing sleeve end face handle threaded holes to fix the bearing plate (I) 22 and the bearing pressing plate 24.

Keep away from for the dabber bearing frame 12.3 department of square piece 12.8 one end the location bearing also is provided with a location bearing, and its structure is: two side-by-side positioning bearing seat rolling bearings 23 are arranged in the bearing position 12.3 for the mandrel bearing seat, a spacer ring is arranged between the two positioning bearing seat rolling bearings 23, a shaft retainer 43 is arranged at the step of the outer positioning bearing seat rolling bearing 23 and the bearing position 12.3 for the mandrel bearing seat, a positioning bearing sleeve 8 is sleeved on the outer circumference of the positioning bearing seat rolling bearing 23, a bearing gland (I) 22 and a bearing gland (II) 24 are respectively arranged on two sides of the positioning bearing sleeve 8, and the three are fixed through a set screw 25, so that the two positioning bearing seat rolling bearings 23 are positioned in the peripheries of the positioning bearing sleeve 8, the bearing press plate (I) 22 and the bearing press plate 24. The structure of the fixed bearing sleeve 8 is shown in fig. 8, and fig. 8 is a schematic structural view of the positioning bearing sleeve in embodiment 1 of the mechanical expansion shaft of the present invention. As can be seen, the positioning bearing sleeve 8 is different from the bearing sleeve 9 in that a triangular ridge is provided on the outer circular wall of the positioning bearing sleeve 8, and the triangular ridge is located in the middle of the outer circular wall and surrounds the outer circular wall in a circle. The specific steps on the figure are as follows: the positioning bearing sleeve 8 is of a cylindrical structure, the outer circular wall of the positioning bearing sleeve 8 is provided with a positioning bearing sleeve outer diameter boss 8.4 which surrounds the outer circular wall for a circle, and the positioning bearing sleeve outer diameter boss 8.4 is of a triangular prism shape. The outer circular walls on the two sides of the positioning bearing sleeve outer diameter boss 8.4 are respectively a positioning bearing sleeve left outer diameter 8.3 and a positioning bearing sleeve right outer diameter 8.3'. The inner circle of the positioning bearing sleeve 8 is a positioning bearing sleeve inner diameter bearing chamber 8.2. A positioning bearing seat rolling bearing 23 can be placed in the positioning bearing sleeve inner diameter bearing chamber 8.2, and the left outer diameter 8.3 of the positioning bearing sleeve and the right outer diameter 8.3' of the positioning bearing sleeve are in contact with the inner circular walls of the positioning bearing seat lower seat body 10 and the positioning bearing seat upper cover 11. The side end faces 8.1 of the two positioning bearing sleeves of the bearing sleeve are uniformly provided with positioning bearing sleeve end face handle threaded holes 8.5, and a set screw 25 is screwed in the positioning bearing sleeve end face handle threaded holes to fix the bearing pressure plate (I) 22 and the bearing pressure plate 24.

The structure of pedestal 10 and location bearing frame upper cover 11 under the location bearing frame that cooperates and carry out the use in location bearing housing 8 is shown as fig. 10 and 11, and fig. 10 is the utility model discloses a structural schematic of pedestal under the location bearing in mechanical expansion axle embodiment 1, and fig. 11 is the utility model discloses a structural schematic of location bearing frame upper cover in mechanical expansion axle embodiment 1. As can be seen from the figure, the lower seat body 10 of the positioning bearing seat comprises a semicircular bearing chamber, i.e. a bearing chamber 10.5 of the lower seat body of the positioning bearing, and a positioning groove 10.7 of the lower seat body of the positioning bearing is arranged in the middle of the circumference of the bearing chamber and is matched with a boss 8.4 of the outer diameter of the positioning bearing sleeve on the positioning bearing sleeve 8. The lower positioning bearing seat body 10 is fixed on a frame body, the fixing screws with long diameters penetrate through the fixing screw through holes 10.8 of the lower positioning bearing seat bodies, the fixing screw through holes 10.8 of the lower positioning bearing seat bodies are distributed on two sides of a bearing chamber 10.5 of the lower positioning bearing seat body in pairs, and a closing plane 10.4 on the lower self-positioning bearing seat body penetrates through a closing plane 10.6 of the lower positioning bearing seat body. One side of the lower base body 10 of the positioning bearing seat is provided with a hinge boss, the positive vertical surface 10.1 of the hinge boss of the lower base body of the positioning bearing is vertical to the handle combination plane 10.4 of the lower base body of the positioning bearing, and the side vertical surfaces 10.2 of the hinge boss of the lower base body of the two parallel positioning bearings are vertical to the positive vertical surface 10.1 of the hinge boss of the lower base body of the positioning bearing. And a hinge pin hole 10.3 of the lower positioning bearing seat body is arranged on the hinge boss and close to a handle closing plane 10.4 of the lower positioning bearing seat body, and vertically penetrates through side vertical surfaces 10.2 of hinge bosses of the lower positioning bearing seat bodies. The side surface of the lower positioning bearing seat body 10 opposite to the hinge boss is provided with a lower positioning bearing seat body locking lock sleeve fixing threaded hole 10.10, and a lower positioning bearing seat body locking pin shaft positioning chamber 10.9 communicated with the lower positioning bearing seat body locking lock sleeve fixing threaded hole 10.10 is arranged on a plane 10.4 vertical to the lower positioning bearing seat body. Wherein, a mechanical lock can be placed in the fixed threaded hole 10.10 of the locking lock sleeve of the lower seat body of the positioning bearing seat, and a locking pin can be placed in the positioning chamber 10.9 of the locking pin shaft of the lower seat body of the positioning bearing seat.

The structure of the positioning bearing seat upper cover 11 corresponds to the structure of the positioning bearing seat lower seat body 10, a semicircular positioning bearing upper cover bearing chamber 11.6 is also arranged on the positioning bearing seat upper cover 11.6, a positioning bearing upper cover positioning groove 11.5 is arranged in the positioning bearing upper cover bearing chamber 11.6, and the positioning bearing upper cover positioning groove is matched with a positioning bearing sleeve outer diameter boss 8.4 on the positioning bearing sleeve 8. The side vertical surfaces 11.3 of the two positioning bearing upper covers are vertical to a positioning bearing upper cover lower handle combination plane 11.7 and a positioning bearing upper cover upper plane 11.4, and the positioning bearing upper cover lower handle combination plane 11.7 corresponds to the positioning bearing lower seat body upper handle combination plane 10.4 in size and shape. The hinge boss is matched on the lower base body 10 of the positioning bearing seat, the upper cover 11 of the positioning bearing seat is provided with a hinge groove, the inner side surface 11.1 of the hinge groove of the upper cover of the positioning bearing is matched with the side vertical surface 10.2 of the hinge boss of the lower base body of the positioning bearing, the bottom of the hinge groove is provided with a hinge pin hole 11.2 of the upper cover of the positioning bearing close to the lower handle close plane 11.7 of the upper cover of the positioning bearing, and the hinge pin hole 11.2 of the upper cover of the positioning bearing is matched with the hinge pin hole 10.3 of the lower base body. When the upper cover 11 of the positioning bearing seat is placed on the lower seat body 10 of the positioning bearing seat, the hinge pin penetrates through the two hinge pin holes to fix the upper cover 11 of the positioning bearing seat and one end of the lower seat body 10 of the positioning bearing seat, and the upper cover 11 of the positioning bearing seat can be lifted upwards from the other end, so that the picking and placing operation of the mechanical expansion shaft is realized. The positioning bearing seat at the bearing sleeve 9 has substantially the same structure as the bearing seat described above, and there are a lower bearing seat body 40 and an upper bearing seat body 41, which are different in that there is no positioning groove in the bearing chamber because there is no positioning boss on the bearing sleeve 9.

The end part of the mandrel 12 close to one end of the positioning bearing sleeve 8 is also provided with a jaw clutch, and the jaw clutch is arranged to realize free movement of the mechanical expansion shaft. When the mechanical expansion shaft is placed on the frame body, the sliding end of the jaw clutch on the power equipment moves to the fixed end of the jaw clutch on the mandrel and is matched with the fixed end of the jaw clutch, and the rotation of the mechanical expansion shaft can be realized by starting the power equipment. When the mechanical expansion shaft needs to be moved, the sliding end of the jaw clutch on the power equipment needs to be moved away, the fixed end of the jaw clutch on the mandrel is separated, and then the positioning bearing seat upper cover 11 and the bearing seat upper seat body 41 are opened. The concrete structure of the jaw clutch is shown in fig. 15, and fig. 15 is a schematic structural view of the fixed end of the jaw clutch in embodiment 1 of the mechanical expansion shaft according to the present invention. The key point of the jaw clutch is that the jaw and the groove are arranged, the middle part of the clutch is provided with a clutch fixed end inner diameter hole 15.4 and a clutch fixed end key groove 15.5, the clutch fixed end 15 is fixed on the mandrel 12 by a shaft end pressure plate 20 matched on the mandrel 12 and a mandrel sliding end clutch positioning key 12.2, and the outer surface 15.3 of the clutch fixed end inner sleeve is close to the shaft end pressure plate 20. The outer diameter 15.1 of the fixed end of the clutch is provided with a fixed screw hole 15.6 of the fixed end of the clutch, and the fixed end of the clutch can be further fixed on the mandrel 12 by the fixing screw passing through the fixed screw hole 15.6 of the fixed end of the clutch and abutting against the mandrel 12. The clutch fixed end jaw groove 15.2 is a fan-shaped groove, one side of which is adjacent to the clutch fixed end jaw hollow groove 15.8 to form a hook head in each phase. The outer side of the hook head is a plane 15.7 of the clutch fixed-end jaw hook head, the plane 15.7 of the clutch fixed-end jaw hook head is vertically adjacent to a plane 15.9 of the clutch fixed-end jaw hook head, and the hook head can be matched and embedded into a jaw empty groove in a groove of the clutch sliding end.

When the mechanical expansion shaft is formed by the structure, the left-handed screw 12.6 for the mandrel expansion shaft nut and the right-handed screw 12.6' for the mandrel expansion shaft nut are respectively screwed with one expansion shaft nut 4, the small ends of the two expansion shaft nuts 4 are inward, and the expansion shaft nuts 4 are inward simultaneously or outward simultaneously when the mandrel rotates due to the fact that the screw rotation directions are opposite. The outer side of the screw rod on the mandrel is provided with an adjusting sleeve 30, the outer side of the adjusting sleeve 30 is sequentially provided with a rolling bearing and a thrust ball bearing, the rolling bearing and the thrust ball bearing are both embedded in a bearing chamber of the baffle plate 3, the outer side of the thrust ball bearing 37 is provided with a thrust ball bearing seat sleeve 38, the outer side of the thrust ball bearing seat sleeve 38 is sequentially provided with a locking sleeve 27 and a locking nut 26, the locking sleeve 27 is fixed on the mandrel 12 through a positioning screw 28, and the locking nut 26 is screwed on the thread 12.4 for the mandrel locking nut to further fix the thrust ball bearing 37.

A pressing plate 14 is fixed on a boss of the expansion shaft nut 4, an inclined block 5 is attached to the pressing plate 14, a left slide way 6 and a right slide way 6 ' are fixed on two sides of the inclined block 5, bottoms of the left slide way 6 and the right slide way 6 ' are hooked on a T-shaped structure formed by the pressing plate 14 and the boss on the expansion shaft nut, and the left slide way 6, the right slide way 6 ' and the inclined block 5 can move relative to the T-shaped structure. And expansion shaft supporting plates 13 are fixed on the outer sides of the inclined blocks 5, and each expansion shaft supporting plate 13 is fixed on two inclined blocks 5. The six expansion shaft support plates 13 enclose a cylinder, the diameter of which can be increased or decreased according to the movement of the expansion shaft nut 4. The cylindrical outer edge of the expander support plate 13 is used to support a cylindrical coil inner diameter or material tube core 34, which may be replaced as needed. Two ends of the expansion shaft supporting plate 13 are respectively fixed with a side sliding block 7, and a sliding block boss of the side sliding block 7 protrudes out of the end part of the expansion shaft supporting plate 13 and extends into a side sliding block groove 3.6 on the baffle plate 3.

Example 2

The utility model provides a concrete embodiment of machinery axle that expands, its structure is as follows:

the utility model provides a mechanical expansion axle, includes dabber and bloated axle backup pad, and the one end of dabber is equipped with square piece, and dabber middle part symmetry is equipped with two sections external screw threads opposite in direction of rotation, and the cover has an axle nut that expands on each external screw thread respectively, and the axle nut outer wall that expands is for the awl column structure, and the inner wall is equipped with the internal thread that corresponds with the epaxial external screw thread of dabber, and two axle nut symmetries that expand set up, and the outer wall of axle nut that expands is equipped with a plurality of can incline slide mechanism on the axle nut that.

The structure of the tilt slide mechanism in this embodiment is: the outer wall of the expansion shaft nut is provided with a plurality of inverted T-shaped grooves, the bottoms of the inverted T-shaped grooves and the axis of the expansion shaft nut form acute angles, an inclined block with an inverted T-shaped cross section is clamped in each inverted T-shaped groove, the outer wall of the inclined block clamped in each inverted T-shaped groove is parallel to the axis of the expansion shaft nut, and the outer wall of each inclined block is fixed with the expansion shaft support plate.

The outer side of the inclined sliding mechanism is fixed with an arc-shaped sheet-shaped expansion shaft supporting plate, each expansion shaft supporting plate is longitudinally fixed on the inclined sliding mechanism on two expansion shaft nuts respectively, the six expansion shaft supporting plates surround the mandrel to form a cylindrical outer wall, the end parts of the two ends of each expansion shaft supporting plate are fixed with side sliding blocks respectively, the end parts of the two ends of each expansion shaft supporting plate on the mandrel are respectively sleeved with a rolling bearing, the rolling bearings are respectively clamped in inner bearing chambers of the baffle plates, each outer bearing chamber of each baffle plate is clamped with a thrust ball bearing, the outer side of each thrust ball bearing is provided with a thrust ball bearing sleeve, the outer side of each thrust ball bearing sleeve is fixed on the mandrel through a locking nut, the outer side of each baffle plate is fixed with at least one pulling pin, the inner side of each baffle plate is provided with a radial side sliding block groove, and each side sliding block is movably.

It is understood that the above embodiments are merely two specific examples, and the present invention includes other structures and variations, and is not limited to the structures illustrated in the above embodiments. In summary, the scope of the present invention also includes other modifications and alternatives apparent to those skilled in the art.

Claims

1. A mechanical expansion shaft comprises a mandrel (12) and expansion shaft supporting plates (13), and is characterized in that one end of the mandrel (12) is provided with a square block, the middle of the mandrel (12) is symmetrically provided with two sections of external threads with opposite rotating directions, each external thread is sleeved with an expansion shaft nut (4), the inner wall of the expansion shaft nut (4) with a frustum shape is provided with an internal thread corresponding to the external thread on the mandrel (12), the two expansion shaft nuts (4) are symmetrically arranged, the outer wall of each expansion shaft nut (4) is provided with a plurality of inclined sliding mechanisms capable of sliding on the expansion shaft nuts (4), the outer side of each inclined sliding mechanism is fixed with an arc-shaped sheet-shaped expansion shaft supporting plate (13), each expansion shaft supporting plate (13) is longitudinally fixed on the inclined sliding mechanisms on the two expansion shaft nuts (4), and the plurality of expansion shaft supporting plates (13) form a cylindrical outer wall around the mandrel (12), the end parts of two ends of each expansion shaft supporting plate (13) are respectively fixed with a side sliding block (7), the end part position of each expansion shaft supporting plate (13) on the mandrel (12) is sleeved with a rolling bearing (35), each rolling bearing (35) is clamped in an inner bearing chamber of the baffle plate (3), each thrust ball bearing (37) is clamped in an outer bearing chamber of the baffle plate (3), a thrust ball bearing sleeve (38) is arranged on the outer side of each thrust ball bearing (37), the outer side of each thrust ball bearing sleeve (38) is fixed on the mandrel (12) through a locking nut, at least one pulling pin (39) is fixed on the outer side of the baffle plate (3), a radial side sliding block groove is formed in the inner side of the baffle plate (3), and each side sliding block (7) is clamped in the side sliding block groove and can move radially.

2. The mechanical expansion shaft of claim 1, wherein the inclined slide mechanism is configured as: the outer wall of the expansion shaft screw (4) is provided with a plurality of inclined convex ribs forming acute angles with the axis of the expansion shaft screw (4), a pressing plate (14) with the width larger than that of each inclined convex rib is fixed on each inclined convex rib, the cross section of the combined inclined convex rib and the pressing plate (14) is T-shaped, an inclined block (5) with an inclined angle is fixed on the outer side of the pressing plate (14), the outer side face of the inclined block (5) is parallel to the axis of the mandrel (12), the outer wall of the inclined block (5) is fixed with the expansion shaft supporting plate (13), the side walls of two sides of the inclined block (5) are respectively fixed with a left slide way (6) and a right slide way (6 ') with L-shaped cross sections, and the bottoms of the left slide way (6) and the right slide way (6') are clamped at the lower end of the pressing plate (14) and can longitudinally slide along the pressing plate (14) along with the inclined block (.

3. The mechanical expansion shaft of claim 1, wherein the inclined sliding structure is configured as: the outer wall of the expansion shaft nut (4) is provided with a plurality of inverted T-shaped grooves, the bottoms of the inverted T-shaped grooves and the axis of the expansion shaft nut (4) form acute angles, an inclined block with an inverted T-shaped cross section is clamped in each inverted T-shaped groove, the outer wall of the inclined block clamped in each inverted T-shaped groove is parallel to the axis of the expansion shaft nut (4), and the outer wall of the inclined block is fixed with the expansion shaft support plate (13).