SU1308458A1 - Impact power nut-setter - Google Patents

Abstract

The invention relates to mechanical engineering. The purpose of the invention is to increase reliability and stability in order to increase the compliance of the impacted surfaces and reduce the impact pulse. The wrench contains the drive with the drive shaft, the housing 3, the composite drummer, the spindle, the anvil. The leading part 4 of the striker is made with a through diametral groove, in which a slider is disposed, made in the form of mutually movable bushings 7 and rod 8, spring-loaded respectively by springs 9 and 10. The spindle has an intermediate shaft 14 with a cam 15. The shaft 14 can move in axial direction direction relative to the anvil. The driven part of the firing pin is made in the form of fingers, oriented relative to the ram. The fingers are crammed with cams, and on the anvil - work surfaces. A groove 25 is made in the sleeve 7 and a latch 26 is mounted. f-ly, 7 ill. (L in-in 11: about about eo: l eo figl

Description

t13084582

The invention relates to a machine. A groove 25 is made in the sleeve 7 and the mouth

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structure, in particular for hand-held impact wrenches, and can be used in various fields of the dates of mechanized tightening of threaded connections,

The purpose of the invention is to increase reliability and stability by increasing the compliance of the impacted surfaces and reducing the shock pulse due to its stretching over time.

FIG. 1 presents the proposed 11 th wrench, cut; figure 2 - section aa in figure 1; on fig.Z - section BB in figure 1; Fig. 4 is a section B-B in Fig. 2 (the position before the start of the interaction of the pusher with the intermediate-shaft cam); fig. 3 - the same, the position after the interaction of the pusher l with the intermediate shaft cam; figure 6 - intermediate shaft, a longitudinal section; FIG. 7 is a view of FIG. 6;

The impact wrench contains a drive 1 with a drive shaft 2, a housing 3, a composite drummer, a leading part 4, which is made with a diametral through groove 5 in which a slider 6 is installed with a center of gravity shifted relative to the axis of the hammer. The shank 6 is made up of two elements that are mutually movable in the axial direction: bushings 7 and stem 8, are mounted with respect to the leading part 4 of the striker, respectively, springs 9 and 10. A certain position of sleeve 7 and the stem 8 in the leading part 4 of the striker is provided with using the pin 1 and the grooves 12. In the spindle 13 an intermediate shaft 14 is installed with a cam 15, the shaft 14 is spring loaded with a return spring 16. The cam 15 of the shaft 14 has a length (in angular measures

less than 180 (FIGS. 6 and 7).

Next, the cam 15 passes into the straight-line portion 17. The position of the shaft 14 relative to the anvil 18 is provided with a pin 19 and the grooves 20, while the shaft 14 can move axially relative to the anvil 18, On the shaft 14 there is a bearing 21 associated with fingers 22, which are the driven part of the firing pin and are oriented relative to the slider 6. On the fingers 22, the working cams 23 are filled, on the anvil 18 there are working surfaces 24,

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15

20

a retainer 26 is inserted, which is spring-loaded with a spring 27 and is placed in the hole 28 of the rod 8. Opposite the retainer 5, the pusher is placed in the rod 8

29s, one end 30 of which can interact with the cam 15 of the shaft 14. The driver 4 of the striker is housed on the bearing 31 and the shaft 14. On the spindle 13 there are means 32 for fastening the end head.

The structure shown in FIGS. 1-7 is described with reference to a pneumatic actuator. It can be used with electric drive. In this case, a coupling is installed between the drive shaft 2 and the driver 4, which prevents the motor from operating in short circuit mode,

50

3

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The wrench works as follows.

After the end head (not shown) is mounted on the tightening joint (not shown), the drive 1 is turned on. After that, the striker 4 and the composite slider 6 (sleeve 7 and stem 8) and fingers 22 are rotated. Since the center of gravity of the slider 6 is displaced relative to the axis of the leading part 4 of the striker, as the leading part 4 of the striker accelerates, the slider 6 shifts, for example, towards the springs 9 and 10, compressing them. Such movement of the slider 6 continues until the pusher 29 contacts the cam 15 of the shaft 14 (FIG. 4). After the pusher 29 interacts with the cam 15 of the shaft 14, the latch 26 is recessed, and the wiper 18 is disconnected from the hub 7, the spring 10 in this case stops obstructing the displacement of the sleeve 7 and the latter under the action of centrifugal force is sharply displaced, compressing the spring 9. As a result of this displacement, the sleeve 7, rotating with the driving part 4 of the striker, begins to contact its outer cylindrical surface with the cam 15 of the shaft 14 (figure 5) while shaft 14 with fingers 22 moves toward the anvil 18 to engage the working cams 23 with the working surfaces

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24,

a shock occurs in which the accumulated kinetic energy of the rotating masses is transferred to a threaded joint. After the impact, under the action of the springs 9, 10, 6 and 27, the details of the percussion mechanism return to their original position. The shocks are repeated periodically until the drive is on,

Since the cam 15 of shaft 14 is oriented relative to the working surfaces 24 of the anvil 18, and the slider 6 is relative to the fingers 22, the movement of the latter towards the anvil 18 occurs in a strictly oriented position, which completely eliminates the appearance of edge shocks

Claims (1)

Invention Formula 1, Impact wrench containing a drive, a housing, a drive shaft housed therein, a spindle with an anvil, a composite drummer, the leading part of which is connected to the drive shaft and made with a through-diameter groove in which the slider is placed, the driven part of the drummer is installed in the drive shaft the possibility of relative axial movement and is made with working cams, placed between the driven part and the anvil spring and installed in the spindle with the possibility of joint rotation and relative axial movement between an exact shaft, whose end, opposite the anvil, is a cam, and an axially spring-loaded retainer, which, in order to improve reliability and stability, is a slider made in the form of an axially spring-loaded sleeve and placed in the latter along the axis of the stem having a center hole, the plunger is placed in the latter and is designed to interact with one end with the cam, and the fixer; the torus is housed in the sleeve and is intended to interact with the other end of the plunger, 2, A wrench according to claim 1, 1, about tl and - due to the fact that the driven part of the firing pin is made in the form of at least two fingers connected to the intermediate shaft by means of a bearing mounted on it. W FIG. 2 P yy B 15 Phage.d P 6 kind of g 7 Editor I.Gorn Compiled by V.Matvienko Tehred L.Serdyukova Proofreader T.Kolb Order 1664/13 Circulation 954 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4