JPH0338449B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION OBJECTS OF THE INVENTION (Industrial Field of Application) The present invention relates to a coupling device for forming stand shafts in an exchange-based manner.

(Prior art) For example, in an ERW steel pipe manufacturing line, the forming roll stand has 5 to 7 drive shaft stands.
There are 5 to 7 idle roll stands between the stages and the drive shaft stands, and the sizing roll stand has 5 to 7 drive shaft stands.
Three to six stages of idle roll stands are provided between the drive shaft stands.

In such a production line, it is necessary to replace these rolls when changing the dimensions of the ERW steel pipe.

There are two ways to replace the rolls: one is to replace only the roll, and the other is to replace the entire stand. However, since replacing only the roll requires a lot of effort and time, the replacement-based method, in which each stand is replaced, is often adopted. It is being

However, when replacing the above stand, the coupling that connects the roll shaft and the drive shaft that transmits the driving force is removed, and the roll shaft and drive shaft of the newly brought in stand are connected using the coupling ring. I need to do it again.

However, it is not easy to manually fit and unfit the coupling ring each time the stand is replaced and perform the coupling operation, which causes a problem that the pipe-making operation is interrupted for a long time.

Therefore, a coupling device (Japanese Patent Publication No. 47614/1983) has been proposed which is capable of automatically coupling and separating the roll shaft and the drive shaft without human intervention.

The technology described in the above publication forms a male spline at one end of the roll shaft supported by the bearing box of the drive shaft stand, and also forms a female spline at the coupling of the universal joint supported by the bearing box provided on the bed. At least one of the spline teeth is formed longer than the other teeth, and the long spline teeth engage with each other to facilitate fitting of the other spline teeth. .

(Problem to be Solved by the Invention) However, according to the above-mentioned prior art, it is essential to form at least one of the spline teeth longer than the others; However, it is not easy to manufacture a long one. In other words, in order to make one of the spline teeth longer than the other, it is necessary to leave the tooth to be lengthened and manually shave off the other spline teeth, which is extremely time-consuming to manufacture. Become.

In addition, in the above conventional technology, the position of the exchange roll stand is determined by a temporary stopper, and then this temporary stopper is retracted to connect the coupling device, so the exchange roll stand is once brought close to the temporary stopper, After positioning with the temporary stopper, the temporary stopper must be retracted, which not only makes it troublesome to transport and align the roll stand, but also makes the structure complicated because the temporary stopper can be moved forward and backward. It was hot.

In view of this, the present invention has been made with the aim of solving the problems of the prior art described above, and it not only enables automatic separation and connection of the roll shaft and drive shaft of the stand, but also facilitates the manufacture of the coupling. To provide a coupling device for a molded stand shaft which can obtain a reliable connected state and also facilitates positioning of the stand.

[Structure of the invention]

(Means for Solving the Problems) In order to solve the above-mentioned problems of the prior art, the present invention provides a roll shaft on the forming stand side in a device having a forming stand in which the forming rolls are exchanged by exchanging the roll stand. and a spline shaft that protrudes from each end of the drive shaft on the drive side and has splines in the same phase, a fixed coupling ring whose inner circumference is fitted to the spline shaft on the roll shaft side, and a spline shaft whose inner circumference is fitted on the spline shaft on the drive shaft side. a moving means for moving the movable coupler in the axial direction, and the fixed coupler has an inner circumferential spline fitted to the roll shaft side spline shaft so that the fixed coupler can move freely in the axial direction within the fixed coupler. a movable tooth member having annular teeth coaxially with the spline shaft; positioning means for defining a predetermined advanced position of the teeth of the movable tooth member with respect to the tip of the spline shaft on the roll shaft side; The movable coupler is provided with spring means for biasing it in the advancing direction, and fixed teeth are provided on the outer end surface of the movable coupling so as to face and mesh with the teeth of the movable tooth member.

(Function) With the above configuration, by moving the movable coupling to the fixed coupling side, the fixed tooth and the movable tooth mesh with each other, and the rotation on the drive shaft side is transmitted to the roll shaft side. Thereafter, while the fixed tooth pushes the movable tooth member, the movable coupling ring is fitted into the spline shaft on the roll shaft side, and both spline shafts are rotationally coupled.

(Example) The present invention will be described below with reference to an example shown in the drawings.

FIG. 1 shows a side view of a coupling device 1 according to the invention in a separated state, FIG. 2 a longitudinal side view thereof, and FIG. 3 a longitudinal side view in a coupled state.

In each of the above figures, 2 indicates the roll shaft on the roll stand 3 side, 4 indicates the drive shaft that transmits the driving force,
This drive shaft 4 is connected to a drive side 6 via a universal joint 5 and is supported by an auxiliary stand 7 as a moving means via an elastic member 8 such as rubber and a bearing 9.

Spline shafts 10 and 11 are protruded from opposing ends of the roll shaft 2 and drive shaft 4 so as to face each other on the same axis.

A fixed coupling ring 12 having a cylindrical shape is fitted onto the spline shaft 10 on the roll shaft side, and its base 12A is fixed to the root portion of the spline shaft 10 with a set screw 13, while the spline shaft 10 has movable teeth. A spline 15 on the inner circumference of the member 14 is fitted so that the member 14 is slidable in the axial direction.

This movable tooth member 14 has teeth 1 arranged in an annular shape coaxially with the roll shaft side spline shaft 11 on the outer end surface.
6, and the advancing position of the tooth 16 is limited by a positioning means 17 to a position slightly retreating from the tip of the spline shaft 10,
A spring 18 for advancing the movable tooth member 14 is housed within the fixed coupling ring 12.

In the illustrated embodiment, the positioning means 17 engages a ridge 12B formed inwardly on the outer end of the fixed coupling 12 and a ridge 14A formed on the outer periphery of the proximal end of the movable tooth member 14. This also serves to prevent the movable tooth member 14 from coming off and to restrict the advanced position. However, the positioning means 17 is not limited to this, and may be a pin, a long hole, or the like.

On the drive shaft side spline shaft 11, a movable coupling 19 supported by the auxiliary stand 7 is fitted with a spline 20 on its inner circumference so as to be slidable in the axial direction. Fixed teeth 21 are provided that face and mesh with the teeth 16 of the movable tooth member 14, and the tooth tips of the fixed teeth 21 are approximately in the same plane as the outer end surface of the spline shaft 11 on the drive shaft side. It's dark.

In FIG. 4, reference numeral 22 indicates the roll stand 3.
It also shows the base on which the roll stand 3 is installed.
Both the upper and lower roll axes of the above-mentioned coupling device 1
will be provided.

Next, the operation of the above embodiment will be explained.

The roll stand 3 to be replaced is carried into a predetermined position on the base 22, and then the auxiliary stand 7 is moved to the second position.
When moving in the direction of the arrow in the figure, the movable coupling 19
slides on the drive shaft side spline shaft 11, and the fixed teeth 21 at the outer end thereof engage with the teeth 16 of the movable tooth member 14. As a result, the rotation of the drive-side spline shaft 11 is transmitted to the movable tooth member 14 through the movable coupling 19, and the roll shaft 2 enters a synchronous rotation state.

As the movable coupler 19 is further moved, the movable coupler 19 pushes the movable tooth member 14 into the fixed coupler 12 against the spring 18, and in the meantime, the spline 20 on the inner circumference of the movable coupler 19 rotates the spline shaft 11 on the roll shaft side. is transmitted to the roll shaft 2 via the movable coupling 19, and is coupled to transmit a large rotational torque. In this case, some misalignment of the elastic member 8
is absorbed by the deformation of

When uncoupling, move the movable coupling 19 backward (to the right in the figure), the movable coupling 19 will be separated from the roll shaft side spline shaft 10, and the fixed teeth 21 of the movable coupling 19 will be connected to the teeth of the movable tooth member 14. 16, from the drive shaft side spline shaft 11 to the roll shaft side spline shaft 1.
At the same time as the rotation toward 0 is interrupted, the roll stand 3 is completely separated from the drive side 6 and becomes ready to be carried out.

〔Effect of the invention〕

As explained above, in the present invention, male spline shafts are disposed coaxially on the roll shaft and drive shaft sides, and the splines on the inner circumference of the movable coupling ring are fitted onto the spline shaft on the drive shaft side to move the spline shaft. The movable tooth member is formed to be operable and fitted onto the spline shaft on the roll shaft side with a protruding habit, and the fixed teeth on the outer end surface of the movable coupling ring and the teeth on the outer end surface of the movable tooth member are first engaged. The roll shaft is rotated synchronously, and the movable coupling ring is fitted onto the spline shaft on the roll shaft side, so both the roll shaft and the drive shaft spline shaft have a special structure that requires special machining. By using a normal spline shaft, the movable coupling ring can be externally fitted across both spline shafts, and a connected state can be achieved smoothly. In addition, the movement stroke of the movable coupling ring should be short enough to allow the teeth to mesh with each other.
Therefore, it is possible to easily center the spline shafts without providing a special stopper mechanism or the like for positioning and alignment, and therefore, there are various effects such as minimizing the base area.

[Brief explanation of the drawing]

Fig. 1 is a side view of an embodiment of the present invention in a separated state, Fig. 2 is a longitudinal side view of the same, Fig. 3 is a longitudinal side view of the same in a coupled state, and Fig. 4 is a side view of the whole. It is. 1...Coupling device, 2...Roll axis, 3
... Roll stand, 4 ... Drive shaft, 6 ... Drive side, 7 ... Auxiliary stand, 8 ... Elastic member, 10
... Spline shaft on the roll shaft side, 11 ... Spline shaft on the drive shaft side, 12 ... Fixed coupling, 14
...Movable tooth member, 15, 20...Spline, 1
6...teeth, 17...positioning means, 18...spring, 19...movable coupling ring, 21...fixed tooth, 22...roll stand.

Claims (1)

[Claims] 1. In those with a forming stand in which the forming rolls are exchanged by exchanging the roll stand, the roll shaft on the forming stand side and the drive shaft on the drive side each have a spline shaft with splines in the same phase protruding from each end. , a fixed coupling having an inner periphery fitted to the spline shaft on the roll shaft side, and a moving means for moving the movable coupling on the inner periphery to the spline shaft on the drive shaft side in the axial direction, the fixed coupling having an inner circumference fitted to the spline shaft on the drive shaft side. a movable tooth member having an inner circumferential spline fitted to a side spline shaft so as to be movable in the axial direction within a fixed coupling and having annular teeth coaxially with the spline shaft on an outer end surface; and teeth of the movable tooth member. is provided with a positioning means for defining a predetermined advancing position with respect to the tip of the spline shaft on the roll shaft side, and a spring means for urging the movable tooth member in the advancing direction, and the movable tooth member is provided on the outer end surface of the movable coupling. Fixed teeth are provided opposite to and capable of meshing with the teeth of the fixed coupling, and by moving the movable coupling toward the fixed coupling, the fixed teeth and the movable teeth mesh and the rotation of the drive shaft is directed toward the roll shaft. A molded stand characterized in that after the transmission is in a state, the fixed teeth push the movable tooth member while the movable coupling ring fits into the spline shaft on the roll shaft side, so that both spline shafts are rotationally coupled. Coupling device.