SU1679096A1 - Screw telescopic mechanism - Google Patents

Abstract

The invention relates to mechanical engineering and can be used in various fields of industry, in particular in chemical engineering in load-lifting units of units for the automatic feeding of the workpiece. The aim of the invention is to increase the reliability of the mechanism. To obtain a positive effect, each pad has a tab, and protrusions are formed on the surface of the portions 2, 3, 4 of the guide and screw that mate with the pad, which form the recesses in which the corresponding tabs are placed. When the stage 8 of the screw 7 is rotated, the hollow screw 10 begins to move. One protrusion presses the tab of one of the spacers along the side surface to the flat surface of the other protrusion. Due to the elastic compression, the foot falls into the recess and the screw 7 is screwed onto the screw 10. 7 Il.

Description

The invention relates to mechanical engineering and can be used in various fields of industry, in particular in chemical engineering in load-lifting units of units for the automatic feeding of the workpiece into the working area.

The aim of the invention is to increase the reliability of the mechanism.

FIG. 1 shows the telescopic screw mechanism in the initial position, general view; in fig. 2 - the same in the working position, a general view; in fig. 3 shows the node I in FIG. one; in fig. 4 is a section A-A in FIG. 3 (before mating protrusions); in fig. 5 is a section A-A in FIG. 3 (when mating protrusions); in fig. 6 is a section BB in FIG. 2; in fig. 7 is a sectional view BB in FIG. 2

The helical telescopic mechanism comprises a housing 1, a telescopic guide arranged therein, comprising parts 2, 3 and 4 fixed from axial rotation by longitudinal keys 5, a register pulley 6 associated with a telescopic screw 7 including a screw level 8 supported by a bearing 9 , and hollow steps 10 and 11 resting on the part 2 and 3 of the guides. The hollow stages 10 and 11 mate with each other along the thread and with the stage 8 of the screw 7. In the radial direction, the hollow stages 10 and 11 of the screw mate with a cylindrical neck with parts 2 and 3 of the guide, and in the axial direction with elastic friction pads 12 and 13 on the one hand and radially split rings 14 and 15 fixed on the ends of parts 2 and 3 of the guide and mutually fixing them in the axial direction, on the other hand axially mating hollow steps 10 and 11 of the screws between them with guide 4, st Peña 8 and collar 16 enclosing the bearing 9, is effected by elastic friction pads 17-20.

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On the surfaces of the portions 2, 3, 4 of the guide and the screw mating with the gasket, protrusions 21 and 22 with a flat surface are formed, forming a recess in which the tabs 23 of the corresponding gasket are placed. The height of the protrusions 21 and 22 above the surface of the foot 23 of the corresponding gasket is less than the pitch of the corresponding screw.

Screw telescopic mechanism works as follows

When the telescopic mechanism expands, rotation from the drive is transmitted through pulley 6 to stage 8 of screw 7, the thread of which begins to move the stage 10 connected to part 2 of guide ring 14 to adhere to stage 8. The coupling proceeds as follows; Part 2 of the guide approaches the end surface of the screw stage 8 (the movement occurs along the screw, as the key 5 prevents the rotary movement of the stage 1U). The protrusion 21 presses the tab 23 of the gasket 19 along the side surface to the flat surface of the protrusion 22. Due to the elastic compression, the width B of the legs 23 decreases to the size of the height h of the flange 24, which presses against the surface of the protrusion 22 to form a recess. A clutch occurs in which the torque is transmitted from stage 8 to stage 10 through conjugation of the protrusions 21 and 22, after which the joint rotation of the stages 8 and 10 begins, in which along the latter, supported by the guide 2, the joint begins to move. with the guide 3 and the ring 15 a hollow screw 11 before engaging with the hollow screw 10 through the tab 23 of the elastic gasket 17 and interacting the radial protrusion 22 with the shelf 24 of the protrusion 21 with the formation of a recess, which causes the coupling of the steps 10 and 11 and the transmission of torque t stage to stage 11 via the projection 24 and the flange 21c of the protrusion 22, when it starts rotating joint 8 stages, 10 and 11 screws. At the same time, along the thread of the step 11, resting on the part 3 of the guide, the part 4 of the guide begins to move before adhesion in the described manner with the step 11.

When moving parts of the mechanism into the body interact pairs of surfaces:

a1 -d, a2-c2, a3-c3 where ai is the front surface of the collar 16 of the screw 8 from the side of the stage 10;

c1 is the front surface of step 10;

A2 is the surface of the end portion of the guide 2 from the side of the stage 11;

c2 is the front surface of step 11; AZ - the surface of the end section of the guide 3 from the side of the guide 4; s3 is the end face of the guide 4.

In the plane of the surface a, there is an elastic gasket 20, surfaces a2 - gasket 12 and surfaces AZ - gasket 13.

When moving parts of the mechanism out of the body interact pairs of surfaces:

d1 -e1, d3 is e3, where d1 is the surface of the outer end portion of the step 8 from the side of the collar 16;

e 1 is the surface of the end portion of the step 10 on the side of the guide 4;

d2 - the surface of the outer end portion of the stage 10 from the side of the collar 16; e2 is the surface of the end portion of the step 11 from the side of the guide 4;

d3 - the surface of the outer end portion of the stage 11 from the side of the collar 16;

eZ is the surface of the inner end portion of the guide 4 on the side of its outer end.

In the plane of the surface d1 there is an elastic gasket 19, surfaces of d2 - gasket 17 and surfaces of d3 - gasket 18.

Making the height of the radial protrusions 21 and 22 less than the pitch of the thread of the corresponding screw allows for frontal contact interaction of the protrusions, thereby eliminating the mechanism jamming.

Claims (1)

Claims An inventive helical telescopic mechanism, comprising a housing, a telescopic guide arranged therein, mounted for movement in a telescopic guide rail, each stage of which has an annular groove on the outer surface, support rings arranged in respective grooves and interacting with the ends of the respective parts of the guide and elastic gaskets placed between the steps of the telescopic screw and between the last and corresponding parts of the guide, from characterized in that, in order to increase reliability, each gasket has a tab, and on the surface of the guide and screw parts. matching with the gasket, the protrusions are formed, forming recesses in which the corresponding legs are placed, and the height of the protrusion is less than the thread pitch of the corresponding screw level. sixteen 21.20 eight but Fy Phage.Z 5 18 Phage.5 Phage