SU912396A2 - Apparatus for restoring pitch of sleeve and roller chains - Google Patents

Description

(54) DEVICE FOR RESTORING A STEP OF SLEEVE AND ROLLER CHAINS

one

The invention relates to the processing of metals by pressure and can be used to restore the pitch of chains, which is increased as a result of the wear of the rollers and sleeves.

According to the main author. St. No. 764824, a device for restoring the pitch of the stub and roller chains, comprising two working tools and a gauge-stop, made in the form of sprockets with a step equal to twice the step of the chain 1, is known.

However, the known device is intended only for the restoration of long-link chains.

The aim of the invention is to expand the range of products to be repaired.

The goal is achieved in that the device for manufacturing the pitch of the bushing and roller chains, contains a mechanism for feeding the chain, two working tools installed opposite one another, and a caliper installed in a plane perpendicular to the plane of the tools; Asterisks with a step equal to twice the chain pitch, each tooth of the working tools has a hollow along the axis with a radius of locking sections, and the width of the tooth of the gauge-stop is made corresponding to the tooth hollow umentov.

FIG. 1 shows the kinematic diagram of the device; in fig. 2 and 3 - the relative position of the stars in two forms; in fig. 4 - the shape of the working teeth and the general view of the chain before and after bending the plates of the outer links.

Claims (1)

The device consists of an electric motor of 10 liters 1, a re / an injector 2, an output shaft 3 with a bevel gear 4 which engages with a wheel 5 mounted on a common shaft 6 with an asterisk 7, which is a working tool. The shaft 3 is telescopically connected to the shaft 15, on which an asterisk 9 is seated, which is a caliber stop. The shaft 8 is telescopically connected to the shaft 10 carrying the bevel gear 11, which is coupled to the wheel 12, and the sprocket 13. On the common shaft 20 and the bevel wheel 12, a second sprocket-tool 15 is fixed, identical to the sprocket 7. The asterisk 13 together with the sprocket 16 form a chain drive, the shaft 17 of which is telescopically connected to the shaft 18, on which is fixed an asterisk 19, which is leading in a chain gear, where the star is 20. The shafts 3 and 6 are mounted in bearings, resting in a movable case with a nut 21, having eg right mic ical threaded shafts 10, 14 and 17 are also mounted in the bearings of the movable body with a nut 22 having the same left-hand thread. A screw 23 is threaded into the nuts 21 and 22, having a thread corresponding to the nuts and ending with a flywheel 24. The gear ratio of the 4, 5 and 11, 12 gears, as well as the diameters of the sprockets 7, 15 and 9 are adjusted so that the circumferential sprocket 9 and the circumference the protrusions of the stars 7 and 15 had the same peripheral speed. The number of teeth of the sprockets 13 and 16 is chosen so that the circumferential speeds of the pitch circles of the sprockets 19 and 9 are equal. Calibrupor 9 and working tools 7 and 15 contain teeth 25 and 26, the angular pitch of which is equal to two steps of a standard sprocket for this chain. Under the asterisk 9 there is a support plate 27 which is adjustable in a vertical direction. The raising and lowering of which is carried out by a screw 28 screwed into a nut fixed to the plate 27. Teeth 26 have a depression along the axis with radius lead-in sections. A 25 gauge stop tooth has a rectangular cross section with rounded corners, and the radius of these corner sections is equal to the lead sections of the teeth pits 26. To facilitate the entry of the tooth 25 into the space between the outer plates of the chain link, chamfers 28 and 29 are made on it. The center distance of stars 7 and 15 is chosen such that the outer link of the chain to be restored passes between the tips of the teeth along the transition fit. The radius of the rounded portions of the teeth 25 and 26 is selected depending on the thickness of the bending chain plate, the physical and mechanical properties of the materials of the plate and the length of the bending part of the plate. The device operates as follows. The chain exposing itself is put on the sprockets 19 and 20 so that its branch has some slack. Here, plate 27 is lowered, and sprockets 7 and 15 are retracted to the sides. After the teeth 26 start to contact with the plates of the screw 28, the chain lifts the sprockets 9 to its engagement with the teeth MI 25. The center-to-center distance of the sprockets 7 and 15 can be adjusted and the support plate 27 can also be moved using an electric, pneumatic or hydraulic actuator. As a result of the bending of the outer plates of the chain, the axes of the chain rollers converge, which leads to a decrease in the pitch of the outer links from t -f At to the required value 1 (where At is the increase in the external links due to wear or other reasons). In this case, the average pitch of the chain to be restored decreases by half the decrease in the pitch of the external links. When restoring a pitch using the proposed device, no disassembly of the chain is required; therefore, the press joints between the roller-plate and the sleeve-plate are not disturbed, the disparity of the steps of the chain does not increase. Chains restored on this device acquire the ability to dampen shock loads, which contribute to increasing the durability of the chain transmission as a whole. The strength characteristics of the individual links and the circuit restored on the described device do not change. Operational testing of chains with curved outer plates showed that a further increase in the pitch of the chain is mainly due to the wear of the rollers and bushings without noticeable extension and destruction of the outer plates at the bend points. Not only the long-link chains, as in the well-known, but also the short-link chains can be restored on this device. Formula of the Invention A device for the restoration of the pitch of the sleeve and roller chains according to aut. St. No. 764824, characterized in that, in order to expand the range of recoverable products, each tooth of working tools has a depression along the axis with radius lead-in areas, and the width of the tooth of the gauge-stop is filled with the corresponding width of the tooth cavity of working tools. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 764824, cl. In 21 L 21/00, 1978 (prototype). Type B ig.1 View A (turned) (rig 5 t + At