SU1189639A1 - Multispindle nut driver - Google Patents

Abstract

1. MULTI-SPINDLE WIPER, comprising a housing, a drive with a ve; and gears on spindle x, torque limiting couplings and screwing tools, so that, in order to increase the service life, each spindle is made in the form of a sleeve with a ball fixed on its side and inside the hub shaft, on the side surface of which a groove is made with a screw with a straight line along the shaft axis: com, meshed with the ball. 2. A wrench according to claim 1, characterized in that the springs of the limit torque clutches are made of variable stiffness. (L

Description

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; Q The invention relates to a mechanized tool and can be used in any industry where it is necessary to mechanize screwing fasteners. The aim of the invention is to increase the life of the wrench. The goal is achieved by the fact that each spindle of the wrench is made in the form of a sleeve and a shaft located in it, between which there is a ball meshed with the helical groove of the shaft. In FIG. 1. shows the wrench in the initial position of the spindles, side view; FIG. 2 is a view A of FIG. one; in fig. 3 shows a section BB in FIG. one; Fig. 4 shows a section B-B (a key and a spindle at the end of screwing in fasteners); in fig. 5 - G view on. FIG. four; in FIG. 6, node 7 in FIG. one; in fig. 7 is a view of D in FIG. 1 (position of the cams of the clutch of the limiting moment in the initial position of the wrench); in fig. 8 - the same (when reaching the torque limit) In case 1, a central gear 3 is fixed on the drive shaft 2 and meshes with the driven gear 4, which are attached to the shafts 5, which are the wrench spindles. The output ends of the spindles are made in the form of sleeves 6, rigidly fixed with pins 7 on shafts 5, and have longitudinal grooves 8 and 9. On each sleeve 6 with the possibility of axial movement on the keys 10, placed in the grooves 9, the leading coupling half 11 of the coupling 12 is mounted a cam clutch with cams 13, and a semi clutch 14 with cams 15 and a shank 16. The keys 10 are attached to the floor of the clutches 11 by screws 17. The coupling half 11 rests on the spring 18, the nut 19 and the lock nut 20 ki limit moment. The shank 16 is screwed into the half coupling 14 and secured with a pin 21. The shank 16 has a right-angle hole in which a key 22 with a control part 23 of a rectangular cross section and a recess for the ball 24 is placed. In the sleeve 6 of the spindle there is a shaft 25 with a longitudinal groove 26 and screw groove 27, the beginning and end of which goes to the groove 26. The ball 24 is also placed in the screw groove 27. In the shaft, 25 is pressed a pin with protruding ends 28, which pass through the longitudinal grooves 8 on the spindle sleeve 6 and act through the washer 29 on the spring 18. The end of the 30 shaft 25 through the ball 31 with unified with the possibility of axial movement with the seating part 23 of the key 22, which rests on the spring 32. To prevent the keys 22 from twisting, the body 33 is attached to the body 1, which has supports 34 with sleeves 35, in which the shanks 16 are placed. used to tighten fasteners, for example, bolts 36 with heads 37 for fastening, for example, washers 38 to the axis 39 of the wheel set when mounting axle boxes with roller bearings. The spring 18 is composed of several low-rigidity cup springs 40 and one of a large-spring disc spring. ultimate torque springs 41, between which a washer 42 is placed. A multi-spindle wrench operates as follows. The fastening washer 38 is mounted on the axle 39, the bolts 36 are threaded for several strings by hand. Then the longitudinal movement mechanism (not shown) is turned on, and the wrench is guided to the bolts 36. The wrenches 22 slide onto the bolt heads 37. In this case, each key compresses the spring 32 and slides the fitting part 23 onto the end 30 of the shaft 25. After this, the drive 2 of the rotation of the wrenches' spindles is activated. Torque through drive gear 3 and driven gear 4 on shafts 5 is transmitted to sleeves 6, fixed with pins 7 on shafts 5 and through longitudinal grooves 8 and 9 in sleeves 6, then torque is transmitted partially through shafts 28 to shaft 25 movable in the longitudinal direction , and through the keys 10, placed in the grooves 9 - the leading coupling halves 11, to which the keys are attached. Coupling 11 with cams 13 transmits a torque to the driven coupling half 14 with cams 15 and a shank 16 through which the torque is transmitted to the key 22, the mounting part 23 of which enters the shank 16. When the bolts are screwed in, the keys are pushed under the action of the springs 32, followed by bolt heads at their longitudinal movement, at the beginning of bolt-in bolts, the lead lolufga 11 is prover 31

Regarding the driven coupling half 14, the cams 13 of the driving coupling half begin to press against the cams 15 of the driven coupling half. At the same time, with the angular displacement of the coupling halves relative to each other, shaft 25, turning with the coupling half 11, slides its screw thread 27 along the ball 24, which is in a recess on the shank 16 of the coupling half 14. In addition, the shaft 25 with the end 30 is pushed into the housing part 23 of the key 22, and the pin with the projecting ends 28, through the washer 29, compresses the disc springs 40 and 41. The springs 40 are generally compressed, since their rigidity is insignificant compared to the spring 41.

By the time of tightening, the angular displacement of the coupling halves relative to each other in 360. At the same time, the ball 24 in the helical groove 27 approaches the inlet to the longitudinal groove 26, the springs 40 of low rigidity are compressed to the limit, only compression occurs, the springs 41 limit moment, end 30 shaft 25 extended to the side

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the bolt heads, and the key 22 almost to the end is screwed.

When approaching the tightening torque

5 bolts to the limit (setpoint) value of cam 13, half-coupling 11 slides over cam 15 of half-coupling 14. At the same time, coupling half 11 is gradually pressed back and increases compression

10 spring 41 limit torque. The moment increases, and when it reaches the target adjusted by the nut 19, the top of the cam 13 passes through the top of the cam 15, decreases sharply

The fS of the transmitted coupling torque and, accordingly, the force on the key 22. The ball 24 at this moment enters the longitudinal groove 26 and can no longer hold the shaft 25 from longitudinal movement back from the bolt head, therefore the springs 40 and 41 operate and move the shaft 25 back to its original position in the screw nipple 27. At the same time, the shaft 25 with its end 30 through the ball 31 acts on the mounting part 23 of the key 22 and removes it from the bolt head.

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Claims (2)

. 1. MULTI-SPIND WRENCH containing housing, drive with drive and. driven gears on the spindles, torque limit couplings and screwdriving tools, characterized in that, in order to increase the service life> of operation, each spindle is made in the form of a sleeve with a ball fixed on its side and a shaft located inside the sleeve on the side surface of which a helical groove with a straight section along the axis of the shaft engaged with the ball. 2. Wrench according to claim 1, characterized in that the springs of the limit torque couplings are made of variable stiffness.