JP3007896U - Screw shaft joining device - Google Patents

Abstract

(57) [Abstract] [Purpose] Screw shaft 1 and 1
The screw shaft 2 obtained by processing two male screws is made into one long screw shaft by using the nut 3 for the jig. [Structure] The structure of the present invention is such that the above-described female screw-processed screw shaft 1 and male screw-processed screw shaft 2 are attached to a nut 3
One long screw shaft is obtained by joint welding.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a welding jig for connecting and joining a plurality of screw shafts by matching their screw pitches.

[0002]

[Prior art]

 Conventionally, the screw shaft has been processed by a lathe or a screw lathe, but the maximum length of the screw shaft that can be processed is limited by the length of the bed of these machines. Therefore, there is no longer screw shaft than the capacity of the machine, and when such a long product is needed, the design was changed without exception and a screw shaft with a limited fixed size was used.

[0003]

[Problems to be solved by the device]

 The present invention intends to obtain a long screw shaft by welding a plurality of screw shafts while welding the connecting portions while matching the screw pitches.

[0004]

[Means for Solving the Problems]

 According to the present invention, one screw shaft is provided with a concave female thread on its end face, and the other screw shaft is provided with a convex male screw to be engaged with the female screw on the end face thereof. Connect with a screw, screw it into the screw of the screw shaft, and screw a nut that has a peep hole that penetrates the shaft core so as to straddle both screws of the connecting part, and insert the welding rod from the peep hole. It is characterized by welding.

[0005]

[Action]

 In serial connection of multiple screw shafts, the screw pitch consistency is maintained by screwing a nut that has an internal thread that engages with the screw over both screws of the connection part. Since the holes can be welded, there is no error in the pitch between the two screws.

[0006]

【Example】

 An embodiment of the present invention will be described below. Fig. 1 shows the outline of the welding device of the present invention, and the details are as follows. The screw shaft 1 shown in Fig. 2 has a male screw 1b on the outer diameter, and one end face of the shaft 1 is provided. The female screw 1a is recessed. 1c is a relief groove for the cutting blade.

The screw shaft 2 shown in FIG. 3 is provided with a male screw 2b on the outer diameter similarly to the screw shaft 1, and a male screw 2a to be engaged with the female screw 1a is formed on one end surface of the shaft so as to project. . 2c is a relief groove of the cutting blade.

Further, what is shown in FIG. 4 is a nut 3 as a jig which is screwed onto the male screws 1b and 2b of the screw shafts 1 and 2, and a body has a peep hole 3a which penetrates the shaft core. Has been. The nut 3 as a jig is long enough to be screwed onto the male screws 1a, 2a across the two screw shafts 1, 2.

Next, the method of connecting the above-mentioned two screws is as follows. That is, the screw shafts 1 and 2 are screwed and connected with the female screw 1a and the male screw 2a, respectively, and a nut 3 as a jig is screwed so that the screw shafts 1 and 2 are engaged with each other over the male screws 1b and 2b. In this case, it is necessary to rotate the screw shafts 1 and 2 slightly to the left and right to match the pitches of the males 1b and 2b. However, if the nut 3 as a jig is screwed to rotate smoothly, the pitch will change. This is a perfect match.

As described above, after the nuts 3 for jigs are screwed into the two screw shafts 1 and 2, the welding rod 4 is inserted from the peep hole 3a as shown in FIG. And the male screw 2a of the screw shaft 2 or the relief groove 2c of the cutting blade are welded. Further, the axially symmetrical position of the welding point is also welded, and the jig nut 3 is rotated by 90 ° to weld two more places. As described above, by appropriately rotating the nut 3 for the jig, it is possible to perform a sufficient number of spot weldings in terms of strength.

By the above operation, the connection of the screw shafts 1 and 2 is completed, after which the jig nut 3 is removed. In the above, the connection of the two screw shafts has been described, but the same method is used. Naturally, more screw shafts can be connected.

A movable nut 5 with a flange, for example, is screwed onto the screw shaft connected by the device of the present invention, and the nut 5 is screwed onto the screw as the shafts 1 and 2 (or the nut 5) rotate. Although it will move, the screw pitch is accurately aligned, so it moves smoothly without any resistance at the shaft joint. Such a screw shaft is used as a gondola lifting drive.

[0013]

[Effect of device]

 As described above, the jig nut 3 as the screw shaft connecting device according to the present invention has such a length as to be screwed over the two screw shafts and has the peep hole 3a. Therefore, it is possible to perform welding by accurately matching the pitches of the male screw 1b of the two screw shafts 1 and the male screw 2b of the screw shaft 2. Therefore, a long screw shaft can be easily obtained.

[Brief description of drawings]

FIG. 1 is a central sectional view of a screw shaft joining device of the present invention.

FIG. 2 is a central sectional view showing a part of an end portion of a screw shaft 1.

FIG. 3 is a central sectional view showing a part of an end portion of a screw shaft 2.

FIG. 4 is a cross-sectional view of a jig nut.

FIG. 5 is a central cross-sectional view showing a welded screw shaft.

[Explanation of symbols]

 1 Screw shaft 2 Screw shaft 3 Nut (for jig) 4 Welding rod 5 Nut (for screw shaft)

Claims (1)

[Scope of utility model registration request] 1. In connection joining of a plurality of screw shafts, a nut screwed into the screw and having a peep hole penetrating the shaft core is screwed so as to straddle both screws of the connection part, and the nut peep hole A screw shaft joining device characterized by inserting a welding rod or the like for welding.