SU618231A1 - Assembling and welding arrangement - Google Patents

Description

I

The invention relates to the field of engineering, in particular to devices for assembling and welding drill bits.

A device for establishing joints between segments of a roller bit is known, comprising a faceplate (chuck) with clamping jaws. The bit trigger is carried out at three points in one plane of the bit. To ensure that the bit is clamped in the bit, the process grooves are milled. The faceplate can be rotated around its axis and tilted at different angles. The swivel plate with the faceplate is fixed in the bed ll.

However, in the known device, the design of the three-jaw chuck is not mine. It can provide significant pressure, and the clamping device here serves only to fix the sections of the bit before welding. It is impossible to create significant crimping forces when a load is applied at three points in such a cartridge.

A device for assembling and welding mainly drill bits cones, which has a G27 pneumatic cylinder interacting with them, is known.

A disadvantage of the known device is the low accuracy of the assembly due to the impossibility of the transfer by the lever of the crimping force to the friction product by a virtue of three points.

The purpose of the invention - increase -. assembly by increasing the clamping force of the product. According to the invention

A ball bearing is fixed in the device case and the pneumatic cylinder rod is mounted on the said support, and removable cams interacting with clamping levers are mounted on the pneumatic cylinder case. A swivel arm with an adjustable stop is installed at the working end of each clamping lever.

Claims (2)

with two adjustable stops. At the same time, the clamping levers are made with a flat ratio of 4: 1. FIG. 1 schematically shows the proposed device, a side view of FIG. 2 - view A of FIG. 1. A device for assembling and welding the shar-bits of drill bits contains a stand 1, on which the faceplate is pivotally mounted 2. The clamping levers 4 and the ball bearing 5 in which the rod 6 of the pneumatic cylinder is mounted are mounted on the case 3 of the platen The pneumatic valve 7 contains removable cams 8 interacting with the rollers 9 of the clamping levers 4. At I / this, the swivel bracket 10 with an adjustable stop 11, which has a fork 12 with two adjustable stops 13, is hinged at the working end of each clamping lever. Case 3 contains a stand 14 for installing bit sections on it. The bit sections shown in FIG. 1 with a dotted line, mounted on a stand 14 in the horizontal position of the housing 3. After the sections are assembled, the bit is crimped. Air is supplied to the pneumatic cylinders 7. The pneumatic impeller housing moves down; the rollers 9 of the clamping levers 4 slide along removable cams 8. The forces are transmitted to the levers 4 uniformly due to the attachment of the rod 6 in the ball joint 5. The long arms of the levers are diverted. The ratio of the arms leverage 4: 1 optimal. At a lower value, the compression force is insufficient; with a larger compression force excessively for small sizes of bits and the movement of the short arm of the clamping lever will not be enough to cover the whole range of diameters of the welded bits. The compression force is transmitted to the chisel with short shoulders through the stops 11 and 13 to the chisel in two planes, at nine points. The transmission of forces through a swivel bracket 10 with a plug 12 ensures an even distribution of compressive stresses across the mating surfaces of the drill bit. The ratio of arms leverage 4: 1 provides the ability to create compressive forces up to 50 tons. With sTMvi there is no need for tacking. the device can assemble and weld bits of virtually all azme types with a diameter of 90 to 350 mm, which is ensured by removable cams 8 of various thickness proportional to the bit diameter and screw adjustment of the stops 11 11 bar. . Compressed gold together with the body is turned 90 and in this position, welds are made by sequentially turning the faceplate 4. The proposed design allows welding after stapling without machining of the mating surfaces, ensuring high accuracy of mechanical dimensions and reliability of the design. The device is convenient to operate in that the removal and installation of bits is fast, regulation is simple and reliable. Claim 1. A device for assembling and welding mainly drill bits cones, comprising a housing with clamping levers fixed on it and a pneumatic cylinder cooperating with them, which is so as to increase the assembly accuracy by increasing the clamping force of the product in the housing the ball bearing, the pneumatic piston rod is mounted on the said support, and on the pneumatic cylinder body there are removable cams interacting with the pressure levers, while on the working end of each pressure lever there are hinges A swivel bracket with an adjustable stop, in which a plug with two adjustable stops is mounted, is mounted. 2. The device according to claim 1, about tl and chacha-eu by the fact that the arms are clamped with a 4: 1 crying ratio. Sources of information taken into account in the examination: 1.Pateet US No. 3907191, cl. 228-182, 1975. 2. USSR author's certificate number 124879, cl. B 25 B 27/00, 1959.