RU26458U1 - DEVICE FOR MANUFACTURING TUBULAR HEAT EXCHANGER COILS - Google Patents

Description

2002104198

200210419 Device FOR the manufacture of tubular coils

The utility model relates to the processing of metals by pressure, in particular, to devices for the manufacture of tubular coils of heat-exchange apparatus.

A semiautomatic device for winding springs from measured billets is known, containing a rotating mandrel fixed in a movable stand, a mechanism for attaching the end of the workpiece, a winding mechanism made in the form of a) bolt moving along the mandrel, consisting of two halves of a hollow cylinder, a ramrod and two spring rings ( USSR author's certificate No. 695745, class B 21 F 3/04, 1977).

A device for bending with shaping is known, comprising a workpiece winding mechanism arranged on a bed, including a drive mandrel with a central hole and a bending roller mounted in the housing. The device allows the manufacture of spiral-shaped products with internal and external ends (Japanese Application No. 53-39180, CL 21 F 3/04, 1978).

As the closest analogue, a device for the manufacture of spiral tubular electric heaters is adopted, containing a workpiece winding mechanism located on the bed, including a drive mandrel with a central hole and mounted in

ShMPK: V21RZ / 04 heat exchangers

casing a bending roller, a fixed front headstock and a drive tailstock mounted with the possibility of movement. Coaxial shafts are placed in the headstock, in which the left and right parts of the frame are rigidly fixed. (USSR Author's Certificate No. 1147492, class B 21 F 3/04, 1985).

The disadvantage of the above devices is the reduction in product quality due to crushing (flattening) of the workpiece during the execution of the tubular helix.

The technical problem, the solution of which is carried out by a utility model, is to improve the quality of the product and the ease of use of the device while reducing the complexity of the manufacturing process.

The essence of the technical solution of the problem lies in the device for the manufacture of tubular coil heat exchangers, comprising a fixed front headstock and a drive tailstock, a support, a mandrel mounted in the front and rear headstock, and a bending roller, equipped with a bending and clamping device mounted on the support , the case of which is bent towards the movement of the workpiece, the bending roller is movably fixed in the lower part of the body at the level of the mandrel, and in the upper bent part of the body is movably fixed tional roller. In this design, the workpiece in the area between the mandrel and the upper additional roller

pre-bent with a large bending radius, which during winding avoids flattening of the workpiece.

The device comprises a mechanism for attaching one of the ends of the workpiece, including a base rigidly mounted on a mandrel near the headstock and having a groove for the workpiece, which is closed by a tack. This allows you to mount the workpiece not on the mandrel, but tangentially to it and at an elevation angle of the helix of the coil winding.

The rear drive headstock is detachable with the possibility of folding the upper part, which allows not to deform the grotto coil when removing from the mandrel and maximize the use of the bed length.

Figure 1 shows the proposed device; figure 2 - mandrel for winding with a mechanism for attaching the end of the workpiece; in Fig.3 - the tailstock of the device; figure 4 - finished product.

A device for the manufacture of tubular heat exchanger coils consists (see Fig. 1) of a frame 1 on which a movable rear 2 and a fixed front 3 headstock are mounted, in which a mandrel 4 is mounted. A support device is mounted on the support 5, the body of which 6 is bent towards the movement of the workpiece . In the lower part of the housing 6, at the level of the mandrel 4, a bending roller 7 is mounted movably (with the possibility of adjustment) and is mounted along the angle a of the helix of the coil. An additional roller 8 s is movably fixed in the upper part of the housing 6

POSSIBILITY of coordinating their position with the main bending roller 7 (along the workpiece). On the mandrel 4 near the front headstock 3, the base 9 of the fastening mechanism of one of the ends of the workpiece is rigidly fixed (see figure 2). The base 9, protruding beyond the mandrel 4, has a groove 10 for fixing the workpiece in it, rigidly closed by a gripper 11.

The rear movable headstock 2 (see FIG. 3) is detachable with the possibility of folding the upper part 12 to the side that does not interfere with the removal of the finished coil from the mandrel 4. The line of the connector 13 is located below the line of centers 14 at the maximum outer radius of the manufactured coil.

The device operates as follows.

In the initial position, the mandrel 4 is fixed in the cartridge of the front headstock 3. We take the workpiece (with a pre-bent end) and fasten it with the bent end in the groove 10 of the base 9 of the fastening mechanism with a grip 11, positioning the workpiece along the angle of the helix of the coil a, tangential to the surface of the mandrel 4 We bring the bending roller 7 to the workpiece and insert it into the groove of the roller 7, set at an angle of elevation of the helix of the coil a. We turn on the rotation of the mandrel 4 and bring the workpiece to the upper roller 8, set it in the direction of the workpiece and put it into the groove of the roller 8. Bending and pressing device together with the support 5

moves along the mandrel 4, which winds the coil blank (at a speed of 10 rpm). The preform is preliminarily made so long that when winding the required number of turns, the second end of the workpiece does not come out of the groove 10 of the upper roller 8. If this is not done, then when the second end of the workpiece approaches roller 8, an extension must be inserted into the workpiece.

After the end of the winding, the lead screw caliper 5 is turned off and the caliper 5 is manually retracted from the coil so that its end leaves the groove of the bending roller 7 by rotating the mandrel 4 in the opposite direction to winding to remove the coil spring (voltage), while the second end of the coil exits the groove 10 roller 8, the rotation of the mandrel 4 is stopped.

To remove the finished coil, we remove the tailstock 2 from engagement with the mandrel 4, freeing its end, the upper part 12 of the tailstock 2 is tilted, the first end of the coil is detached and removed from the mandrel 4 without moving the headstock 2 and without bending the finished coil during removal.

Thus, using the proposed device, the manufacture of tubular coils of heat exchangers from blanks without fillers is made with an ovality that does not go beyond the tolerance. This is achieved by eliminating the flattening of the pipe along the entire length of its winding, since the workpiece is not attached to the mandrel, but tangentially to it at the angle of elevation of the helix of the coil winding, and in

Between the mandrel and the upper additional roller, the workpiece is pre-bent with a large bending radius and the initial tension does not arise in it, which flattenes the workpiece. In addition, the implementation of the rear movable tailstock allows not only not to deform the finished coil when removing from the mandrel, but also to maximize the use of the device bed length, which is especially important when the proposed device for manufacturing tubular coil heat exchangers is made on the basis of a screw-cutting machine, where the bed length standard. All this enhances the quality of manufactured products, ease of use of the device while reducing the complexity of the manufacturing process.

The industrial applicability is obvious. The proposed solution of the authors found application in one of the organizations of the city of Nizhny Novgorod in December 2001 and showed positive results.

These features distinguish the proposed technical solution from the prototype and determine the compliance of this solution with the requirements of a utility model.

Claims (3)

1. A device for the manufacture of tubular coil heat exchangers, comprising a stationary front headstock and a drive tailstock, a support, a mandrel mounted in the front and rear headstock, and a bending roller, characterized in that it comprises a bending and clamping device mounted on the support, whose body is bent towards the movement of the workpiece, the bending roller is movably fixed in the lower part of the body at the level of the mandrel, and in the upper bent part of the body the additional roller is movably fixed.  2. The device according to p. 1, characterized in that it comprises a mechanism for attaching one of the ends of the workpiece, including a base rigidly mounted on a mandrel near the headstock and having a groove under the workpiece, which is closed by a tack. 3. The device according to claims 1 and 2, characterized in that the rear drive headstock is detachable with the possibility of folding the upper part.