RU2782947C2 - Clamping device for polyethylene pipes - Google Patents

Abstract

FIELD: mechanical engineering.

SUBSTANCE: invention relates to the field of mechanical engineering; it can be used for fixation of polyethylene pipes for an operation of cutting with subsequent processing. A clamping device for polyethylene pipes contains a split case consisting of two parts. On an inner cylindrical surface of the case, risks are carved with a width of 2 mm and a radius of 1 mm at an interval of 16 mm. Risks with the radius of 1mm provide reliable fixation of polyethylene pipes without the presence of defects. Eight supports with holes and four hinges are attached to the split case, using welded joints. Two upper and two lower axes are inserted into holes of supports. Four axes are fixed using washers and splints in supports. At the same time, two levers are installed on two upper axes, freely rotating on upper axes and fixed with their spherical part on two lower axes at a moment of clamping the polyethylene pipe. Levers are designed for reliable fixation of the polyethylene pipe due to full contact of the inner cylindrical surface of the split case with the polyethylene pipe. Two axes fixed using washers and splints are also installed in hinges. Moreover, hinges are freely rotated on axes.

EFFECT: provision of reliable fixation of polyethylene pipes without the presence of defects, such as risks, burrs, dents on a surface of polyethylene pipes after clamping, as well as ease of manufacture.

1 cl, 3 dwg

Description

The invention relates to the field of mechanical engineering (pipe production) and can be used for fixing polyethylene pipes for cutting operations with subsequent processing.

A clamping device for pipes is known (patent RU No. 2653102, IPC F16J 15/46, B23V 31/20, publ. in the body, a collet clamp, consisting of a holder made of an elastic material, clasping a collet element, on the outer surface of which protective plates are fixed. In this case, the part of the housing with a nest under the end section of the pipe has a channel for supplying a working fluid, communicated with the cavity of the nest and provided with an additional channel connecting it with an annular cavity formed by a diametrical recess made on the outer surface of the holder from an elastic material, and the inner surface of the housing. The collet element is made in the form of a cylindrical sleeve, along the generatrix of which there are through slots that do not reach the edge of the sleeve.

The closest in technical essence is a clamping centering device for a butt welding machine (AS No. 231041, IPC F16L 3/13, publ. 11/15/1968, bull. No. 35), containing two housings with rings turning in them from hydraulic cylinders and clamping shoes. The inner surface of the rings is equipped with pressed-in rollers that interact with the different-angled bevels of the clamping shoes when the pipe is clamped, and inclined ledges that interact with the two-arm levers installed in the housings and retract the clamping shoes to their original position when the pipe is unclenched.

The disadvantages of the known devices are the impossibility of reliable fixation of polyethylene pipes, the presence of defects on the surface of polyethylene pipes after clamping, the high complexity of manufacturing.

The technical objectives of the proposed device are to ensure reliable fixation of polyethylene pipes without defects (risks, scuffs, dents) on the surface of polyethylene pipes after clamping, as well as ease of manufacture.

Technical problems are solved by a clamping device for polyethylene pipes, containing a body, levers.

What is new is that the body is made split and consists of two parts, on the inner cylindrical surface of the body, risks are machined 2 mm wide with a radius of 1 mm with a step of 16 mm, and eight supports with holes and four hinges are attached to the split body by means of welds, in holes of the supports, two upper and two lower axles are installed, fixed with washers and cotter pins in the supports, while two levers are installed on the two upper axles, freely rotating on the upper axles and fixed with their spherical part on the lower axles at the moment of clamping the polyethylene pipe, also in hinges two axles are installed, fixed with washers and cotter pins, and the hinges rotate freely on the axles.

Figure 1 shows a clamping device for polyethylene pipes (front view).

Figure 2 shows a clamping device for polyethylene pipes (left view).

Figure 3 shows a clamping device for polyethylene pipes (rear view).

The clamping device for polyethylene pipes (figure 1, 2, 3) contains a split body 1, consisting of two parts. On the inner cylindrical surface of the housing 1, risks 2 mm wide with a radius of 1 mm with a step of 16 mm are machined. Risks with a radius of 1 mm provide reliable fixation of polyethylene pipes without defects. Eight supports 2 with holes and four hinges 3 are attached to the split body by means of welded seams. Two upper 4 and two lower 5 axes are installed in the holes of the supports. Four axles are fixed with washers 6 and cotter pins 7 in supports 2. At the same time, two levers 8 are installed on the two upper 4 axles, freely rotating on the upper axles 4 and fixed with their spherical part on the two lower axles 5 at the moment of clamping the polyethylene pipe. The levers 8 are intended for reliable fixation of the polyethylene pipe due to the full contact of the inner cylindrical surface of the split housing 1 with the polyethylene pipe. Also, two axes 9 are installed in the hinges 3, which are fixed with the help of washers 10 and cotter pins 11. Moreover, the hinges 3 freely rotate on the axes 9.

Clamping device for polyethylene pipes works as follows.

Before starting the cutting operation, the polyethylene pipe is installed on the marking table and a mark is applied at the place of cutting. In the split housing 1 install a polyethylene pipe (figure 1, 2, 3 is not shown). The end of the split housing 1 is combined with the marking risk on the polyethylene pipe.

To clamp the polyethylene pipe, the levers 8 are rotated until the spherical part of the levers is fixed on the lower axes 5 of the supports 2. After clamping the polyethylene pipe, the cutting operation is performed. Coaxiality of ±0.05 mm between the clamping device and the polyethylene pipe ensures the required accuracy of its subsequent cutting. At the end of the operation, the segments of the levers 8 rotate in the opposite direction. After that, the polyethylene pipe is removed and the clamping device is again ready for operation.

The technical results of using a clamping device are to ensure reliable fixation of polyethylene pipes without defects on the surface of polyethylene pipes after clamping, as well as ease of manufacture.

The clamping device for polyethylene pipes is manufactured using high-precision CNC turning and milling equipment. For the manufacture of the device, structural carbon steel of high quality 20 and structural carbon steel of ordinary quality St3sp were used.

The device is used in the production of polyethylene pipes with a diameter of 73 to 273 mm.

Claims (1)

A clamping device for polyethylene pipes, containing a body, levers, characterized in that the body is made split and consists of two parts, on the inner cylindrical surface of the body, risks 2 mm wide with a radius of 1 mm in increments of 16 mm are machined, and to the split body using welds eight supports with holes and four hinges are attached, two upper and two lower axles are installed in the holes of the supports, fixed with washers and cotter pins in the supports, while two levers are installed on the two upper axles, freely rotating on the upper axles and fixed with their spherical part on the lower ones. axes at the moment of clamping the polyethylene pipe, two axes are also installed in the hinges, fixed with washers and cotter pins, and the hinges freely rotate on the axes.

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