KR101453433B1 - Device for bi-directional splitting the rod and cap of a connecting rod - Google Patents

Abstract

The present invention relates to a device for bidirectional breaking and splitting of a large end portion cap part and a small end portion column part of a connecting rod used in a car engine. According to the present invention, a novel breaking and splitting method that uses a mandrel which has a double inclined structure, in which a lower inclination angle where a product is positioned matches with an inclination angle of a wedge and an upper inclination angle where the product is not positioned does not match with the inclination angle of the wedge during the breaking and the splitting of the connecting rod, is employed so that a force can be concentrated on a breaking site of the product during the breaking and the splitting and quality can be ensured for the breaking and the splitting. In addition, a central wedge that functions to break the product and an both auxiliary wedges that function to widen a slide plate and the mandrel are combined with each other in the novel breaking and splitting method to which rolling friction and an LM structure between the slide plate and an upper frame are applied. Accordingly, the force that acts during the breaking and the splitting can be concentrated to the center and thus the quality of the breaking and the splitting can be improved.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a device for bi-

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting rod dividing apparatus, and more particularly, to an apparatus for dividing a large end cap portion and a small end column portion of a connecting rod used in an automobile engine into two directions.

Generally, a connecting rod is a driving component that connects a piston to a crankshaft in an engine of an automobile, and transmits power generated by the movement of the piston to the crankshaft.

Usually, the connecting rod is composed of a small end portion connected to the piston, a large end portion connected to the crankshaft, and a column. The large end portion is divided into a portion connected to the column and a portion corresponding to the large end cap.

The method of dividing a column portion and a large end cap portion in such a connecting rod includes a fracture splitting method in which a notched portion is formed at a large end portion and then a wedge is inserted and divided and a joint portion between the column portion and the cap portion is machined to be fastened with bolts and nuts And the like.

Here, in the case of the seat surface machining method, since the contact surface must be milled, it requires not only a large number of steps but also a long time, and the rigidity of the connecting rod is deteriorated due to a decrease in the degree of contact with the contact surface, .

In recent years, there is a tendency to use a fracture splitting method which can reduce the manufacturing cost and increase the durability with fewer steps.

This fracture splitting method is a method of dividing a column and a cap by using a wedge after a notch is formed at a large end portion of a connecting rod and is divided into a two- Directional division method.

Devices for dividing the connecting rod by such a fracture splitting method are disclosed in Korean Patent Laid-open Nos. 10-2001-0022535, Korean Patent No. 10-0669942, Korean Patent Laid-Open No. 10-2009-0049136, and the like.

Fig. 9 shows a general method of dividing a connecting rod using a conventional connecting rod dividing apparatus.

The wedge 160 is lowered by the operation of the hydraulic cylinder 150 to push the mandrel 170 and the slide plate 180 disposed below the upper frame 190 to the left and right The column 120 of the connecting rod 100 and the cap 130 are broken apart.

Here, the unexplained reference numeral 140 denotes a small end portion.

However, in the conventional connecting rod dividing device, since the inclined angle of the inner peripheral surface of the mandrel and the inclination angle of the wedge are in a single inclined angle structure, there is a disadvantage that the force is not concentrated at the fractured portion and is dispersed as a whole , Which causes a problem that the quality of fracture splitting is deteriorated.

10, in the case of the slide plate 180 moving together with the mandrel 170, since the upper frame 190 and the entire surface are in surface contact with each other, There is a disadvantage that the slide plate is rotated due to the frictional force and the force is not concentrated at the center (toward the mandrel) but dispersed to the periphery.

Further, due to the structure of breaking the product while opening the mandrel (slide plate) depending on a single wedge disposed at the center, the force is not concentrated at the center, so that a large force is not added at the time of product breakage, There is a problem that the fracture splitting quality is adversely affected.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a connecting rod double-direction dividing device capable of securing the quality of fracture splitting by concentrating the force of a wedge at a product fracture site upon fracture- .

In order to achieve the above object, the connecting rod double-direction dividing device provided in the present invention has the following features.

The connecting rod bidirectional dividing device is a device for dividing the large end cap portion and the small end column portion of the connecting rod in both directions by breaking, and is provided with a wedge vertically moving by the cylinder, A first slide plate for supporting the first mandrel and the first mandrel, a second mandrel contacting the other inner surface of the other end of the connecting rod, and a second slide plate for supporting the second mandrel, And an upper frame for supporting the slide plate and the second slide plate.

Particularly, the inclination angle of the inner circumferential surface of the first mandrel and the second mandrel of the connecting rod dividing device is set such that the inclination angle of the lower portion where the product is located is the same as the inclination angle of the wedge, and the inclination angle of the upper portion, And has a two-step inclined angle structure with a different inclination angle, and thus has a feature that a force acting at the time of fracture splitting can be concentrated on the fractured portion of the product.

Here, between the first slide plate and the second slide plate and the upper frame, guide means for guiding the first slide plate and the second slide plate when the first slide plate and the second slide plate are extended, for example, upper surfaces of the first slide plate and the second slide plate, A plurality of bearings in rolling contact with the bottom surfaces of the first slide plate and the second slide plate are supported by the LM guide and / or the upper frame side provided between the lower surface of the upper frame.

The connecting rod dividing device may further include both auxiliary wedges disposed on both sides of the wedge and functioning to lower the wedge when the wedge is lowered to open the first and second slide plates to both sides.

At this time, the auxiliary wedges on both sides may be integrally installed in the adapter block supporting the wedge so that the auxiliary wedges can be lowered at the same time when the wedge is lowered. Alternatively, So that it can be operated by the auxiliary cylinder separately from the descent of the wedge.

In a preferred embodiment, the connecting rod dividing device is interposed between the first slide plate and the second slide plate and the upper frame to return the first mandrel, the first slide plate, the second mandrel and the second slide plate after the fracture And a plurality of return springs for rotating the return spring.

The connecting rod bidirectional splitting device provided by the present invention has the following advantages.

First, by applying a structure having an inclined angle structure of the mandrel, that is, a lower part where a product is placed, has an inclination angle in contact with a wedge, and an upper part where the product is not positioned, It is possible to concentrate the force to the product breakage portion, and therefore, it is possible to secure an excellent fracture splitting quality.

Second, by applying the structure including the bearing and the LM guide between the slide plate and the upper frame, surface frictional force is not generated when the slide plate is expanded, so that the force can be concentrated to the center without being dispersed to the periphery, Can be improved.

Third, by applying a structure in which auxiliary wedges are additionally disposed on both sides of one central wedge, the auxiliary wedges on both sides function to open the mandrel (slide plate) to the left and right while the central wedge functions to break the product A large force can be intensively applied to the center at the time of breakage of the product without causing the occurrence of distortion and the like, Can be further improved.

1 is a front view showing a connecting rod two-way dividing device according to an embodiment of the present invention;
2 is a side view showing an example of an auxiliary wedge in the connecting rod double direction dividing device according to the embodiment of the present invention
3 is a front view showing an example of an auxiliary wedge in the connecting rod double direction dividing device according to the embodiment of the present invention.
FIG. 4 is a perspective view of a center wedge and a mandrel in a connecting rod bi-directional dividing device according to an embodiment of the present invention. FIG. 4 is a cutaway perspective view showing an initial falling state a and a final falling state b of the wedge.
5 is a front view, a bottom view, and a side view of the upper frame, the slide plate, and the mandrel in the connecting rod double direction dividing device according to the embodiment of the present invention
6 is a side view showing another example of the auxiliary wedge in the connecting rod bidirectional splitting device according to the embodiment of the present invention
7 is a front view showing another example of the power for raising and lowering the auxiliary wedge in the connecting rod double direction dividing device according to the embodiment of the present invention
8A to 8C are operating states of the connecting rod two-way dividing device according to an embodiment of the present invention, and are a front view showing the initial position, a first descending position and a second descending position (breaking)
9 is a schematic cross-sectional view showing a conventional connecting rod bidirectional dividing device
10 is a side view showing a state of engagement of the mandrel, the slide plate, and the upper frame in the conventional connecting rod bidirectional dividing device

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a front view showing a connecting rod double direction dividing apparatus according to an embodiment of the present invention, and FIGS. 2 and 3 are views showing an example of an auxiliary wedge in a connecting rod double direction dividing apparatus according to an embodiment of the present invention. Side view and front view.

As shown in FIGS. 1 to 3, the connecting rod bidirectional dividing device has a structure in which the inclination angle of the inner circumferential surface of the mandrel in contact with the wedge is formed to be inclined at two ends, and when the wedge is broken at the time of fracturing, So that the force of the wedge can be concentrated only at the product breaking portion by making the wedge contact only at the lower inclined portion of the mandrel in which the product (connecting rod) is located.

This connecting rod bidirectional dividing device has two wedges 11 and two mandrels 12, 14, which provide force for product breakage through the contact between the slopes of each other, and two mandrels 12, An upper frame 16 stacked on top of the slide plates 13 and 15 and vertically installed to form an inner space on the upper frame 16 A main body 30 and the like.

A cylinder 10 is installed in a vertical posture at the upper end of the main body 30 and an adapter block 20 is coupled to a rod of the cylinder 10 installed in this manner. The wedge 11 is coupled to the lower end of the adapter block 20 through a top end thereof. That is, the cylinder 10, the adapter block 20, the wedge chuck 31, and the wedge 11 are coupled to the main body 30 in a line from the top to the bottom.

Here, the adapter block 20 is guided by the guide means 32 provided on both sides of the main body 30 so that the adapter block 20 can linearly move up and down exactly while being guided by the slide.

Therefore, the entire wedge 11 including the adapter block 10 can be lowered or raised during the forward operation or the backward operation of the cylinder 10.

The wedge (11) has a sloped surface on both sides and a wedge shape having a narrower width downward, that is, a sharp pointed downward. The wedge 11 is positioned on the inner side of the first mandrel 12 and the second mandrel 14 through the inclined surfaces and comes into contact with the inclined surfaces of the first mandrel 12 and the second mandrel 14. [ The first mandrel 12 and the second mandrel 14 are pushed to both sides by the contact between the wedge 11 and the inclined surfaces of the mandrels 12 and 14 when the wedge 11 is lowered .

The first mandrel 12 and the second mandrel 14 are arranged in such a manner that the divided pairs are symmetrically opposed to each other and are assembled facing each other, do. Therefore, a space is formed between the first mandrel 12 and the second mandrel 14 in a space in which the wedge 11 can enter, for example, a space having inclined surfaces on both sides.

Particularly, the inner circumferential surfaces of the first mandrel 12 and the second mandrel 14 facing each other are inclined surfaces, and the inclined surfaces at this time are inclined at an angle of inclination (perpendicular to the vertical line) Structure.

This will be described in more detail with reference to FIG. 4 is a cut-away perspective view showing the structure of a center wedge and a mandrel in a connecting rod double direction dividing device according to an embodiment of the present invention. Fig. 4 (a) shows the initial lowering state of the wedge, and Fig. 4 (b) shows the final lowering state of the wedge.

4, the inclined surfaces of the first mandrel 12 and the second mandrel 14 are inclined at an inclination angle equal to the inclination angle of the wedge 11 at which the large end portion of the connecting rod 100 is located, The first inclined surface 23 and the second inclined surface 24 having an inclination angle different from the inclination angle of the wedge 11 at an upper inclination angle where the opposite ends of the connecting rod 100 are not positioned. The inclination angle formed by the first inclined plane 23 is smaller than the inclination angle formed by the second inclined plane 24 and the inclination angle is equal to the inclination angle of the inclined plane of the wedge 11.

The first inclined surface 23 forming the lower inner peripheral surface of the mandrels 12 and 14 is equal to the inclination angle of the wedge 11 and the second inclined surface 24 forming the inner peripheral surface of the mandrels 12 and 14 Has an inclination angle larger than the inclination angle of the first inclined surface 23 and the wedge 11.

Therefore, when the wedge 11 for lowering the connecting rod is lowered, the inclined surface of the wedge 11 is in contact with only the first inclined surface 23 below the mandrels 12 and 14, It becomes possible to concentrate the force. That is, the wedge 11 can be brought into contact with the first inclined surface 23 below the mandrels 12 and 14 having the same inclination angle, and the mandrels 12 and 14, It does not come into contact with the upper second inclined surface 24. This allows the force provided by the wedge (11) to be concentrated under the mandrels (12) and (14), that is, at the fractured portion of the connecting rod.

The first mandrel 12 and the second mandrel 14 are provided with a portion where the wedge 11 and the mandrel 12 are brought into contact with each other at the time of impact, specifically, the first inclined face 23 and the second inclined face 24 A lubricating oil supply passage 33b for supplying lubricating oil to the lubricating oil supply hole 33a formed at the boundary portion of the lubricating oil supply passage 33a.

Referring again to FIGS. 1 to 3, the connecting rod double-direction dividing device according to an embodiment of the present invention will be described. As means for supporting the first mandrel 12 and the second mandrel 14, (13) and a second slide plate (15) are provided. The first slide plate 13 and the second slide plate 15 are positioned opposite to each other with respect to the center wedge 11 and horizontally arranged on the same plane on the bottom of the upper frame 16 do.

The first mandrel 12 and the second mandrel 14 are respectively mounted on the end portions of the first slide plate 13 and the second slide plate 15 facing each other. At this time, the first mandrel 12 and the second mandrel 14 share the center axis with the wedge 11 while partially receiving the lower end portion of the wedge 11. The first slide plate 13 and the second slide plate 15 are slidably moved on both sides together with the first mandrel 12 and the second mandrel 14 which receive the force from the wedge 11.

The first slide plate 13 and the second slide plate 15 are supported by the upper frame 16 by the guide means, and at the same time, they can receive the movement guidance at the time of expansion.

This will be described in more detail with reference to FIG. 5 is a bottom view (left drawing), a front view (right drawing), and a side view (left bottom drawing) showing the upper frame, the slide plate and the mandrel.

Two rows of LM guides 17 are disposed between the upper surfaces of the first slide plate 13 and the second slide plate 15 and the lower surface of the upper frame 16 as shown in Fig. The LM block of the guide 17 is fastened to the lower surface of the upper frame 16 and the LM rail is fastened to the upper surface of the first slide plate 13 and the second slide plate 15, respectively.

Accordingly, the first slide plate 13 and the second slide plate 15 can be moved while being guided by the LM guide 17 during expansion and return. Therefore, by eliminating the problem of frictional force generation (see Fig. 10) caused by surface contact between the slide plate and the upper frame at the time of transferring the slide plate as in the past, dispersion of the force can be maximally prevented. In other words, when the slide plate is expanded, the surface friction force is not generated and the force of the wedge is concentrated to the center (mandrel side) without being dispersed to the periphery.

A cover plate 25 covering the upper frame 16, the first slide plate 13, and the second slide plate 15 is installed vertically at the front and rear ends of the upper frame 16 in the form of a square plate. At the lower end of the cover plate 25, one bearing 18 is mounted toward the inside. At this time, the bearings 18 are arranged in a row in a row and arranged in a line along the slide plate moving direction at regular intervals and in contact with the bottom surfaces of the first slide plate 13 and the second slide plate 15.

That is, the first slide plate 13 and the second slide plate 15 are put on the respective bearings 18 via the bottom surface, and accordingly, the first slide plate 13 and the second slide plate 15, It is possible to minimize the friction and minimize the disruption of the force applied to the product breakage portion at the time of breakage, do.

A plurality of return springs 22 serving to return the first mandrel 12 and the first slide plate 13 and the second mandrel 14 and the second slide plate 15 after the product is completely broken, .

The return spring 22 is installed vertically on the lower surface of the upper frame 16 and the left and right ends of the upper surfaces of the first slide plate 13 and the second slide plate 15 and has spring brackets 26a and 26b As shown in FIG. The return spring 22 is compressed upon expansion of the first slide plate 13 and the second slide plate 15 and after the breakage the first and second mandrels 12 and 14 The entire first slide plate 13 and the second slide plate 15 are returned.

Further, in the present invention, the operation of breaking the product and the operation of opening the mandrel (slide plate) to the left and right are made by separate means, thereby providing a structure capable of adding a large force at the time of product breakage.

To this end, in the present invention, an auxiliary wedge for moving the slide plate apart from the center wedge for entering the inner space between the first and second mandrels is provided for breaking the connecting rod.

As shown in FIGS. 2 and 3, auxiliary wedges 19a and 19b are provided on the inside of the upper frame 16 on both sides of the center wedge 11, that is, on the front and rear sides of the apparatus, . These auxiliary wedges (19a, 19b) are installed so as to be vertically penetrated and supported on both sides of the adapter block (20).

To be more specific, the adapter block 20 is formed with extended portions 20a extending horizontally at predetermined lengths from the lower end of the adapter block 20. These extended portions 20a are fitted in a cylindrical housing 28 having a hollow space therein. At the lower portion of each housing 28, auxiliary wedges 19a and 19b having a predetermined length are installed so as to be vertically pierced. A coil-shaped auxiliary spring (27) is installed inside the housing (28). The auxiliary spring 27 is supported at both ends of the inner upper surface of the housing 28 and at the upper ends of the auxiliary wedges 19a and 19b that enter the interior of the housing 28 and are supported by the auxiliary wedges 19a and 19b It absorbs shocks.

These auxiliary wedges 19a and 19b enter the wedge grooves (29a and 29b in Fig. 5) formed at the opposite ends of the first slide plate 13 and the second slide plate 15, The slide plate 13 and the second slide plate 15 can be opened to both sides.

Concretely, when the wedge 11 is lowered by the operation of the cylinder 10, the first slide plate 13 and the second slide plate 15 are opened to both sides while being lowered into the wedge grooves 29a and 29b . Therefore, the breaking operation of the connecting rod by the center wedge 11 entering the mandrel side and the sliding operation of the slide plate (mandrel) by the auxiliary wedges 19a, 19b entering the wedge grooves 29a, 29b side are performed by separate means .

In this way, by applying a structure in which auxiliary wedges are additionally disposed on both sides of one central wedge, the auxiliary wedges on both sides serve to open the mandrel (slide plate) to the left and right while the center wedge breaks the product So that a large force can be concentrated by the wedge at the center when the connecting rod is broken.

In the above description, the structure in which the ascending and descending of the auxiliary wedges 19a and 19b is installed on the adapter block 20 which is raised and lowered by the cylinder 10 and ascended and descended together with the adapter block (central wedge) has been described. However, the present invention is not limited to such a method, and a method of raising and lowering the adapter block (center wedge) separately is also possible for raising and lowering the auxiliary wedges 19a and 19b.

That is, according to the present invention, the auxiliary wedges 19a and 19b move up and down together with the center wedge 11 by using the power (central cylinder 10) 3 may be employed. However, a structure in which the auxiliary wedges 19a and 19b are raised and lowered by using a power different from the power for raising and lowering the central wedge 11 can also be applied.

6 and 7 are a side view and a front view showing another example of an approach for raising and lowering an auxiliary wedge in a connecting rod bidirectional splitting apparatus according to an embodiment of the present invention. In FIGS. 6 and 7, as an example of another method for raising and lowering the auxiliary wedge, a method of operating auxiliary wedges 19a and 19b by a means such as a pneumatic or hydraulic cylinder is provided.

6 and 7, auxiliary wedges 19a and 19b are disposed on both sides of the center wedge 11 on the inside of the main body 30, respectively, The auxiliary wedges 19a and 19b are connected to the rods of the respective auxiliary cylinders 21a and 21b installed in a vertical posture such that the rod is directed downward to the main body 30. [

The auxiliary cylinders 21a and 21b are operated at the same time when the central wedge 11 is lowered by the operation of the cylinder 10 and the auxiliary wedges 19a and 19b descending with the wedge 11 are simultaneously moved by the first slide plate 13 The first slide plate 13 and the second slide plate 15 are opened to both sides while entering the wedge grooves 29a and 29b between the first slide plate 15 and the second slide plate 15. [

As a result, the product breaking operation by the wedge 11 at the center entering into the mandrel side by the operation of the cylinder 10 and the operation of the auxiliary cylinders 21a and 21b cause the auxiliary wedge 19a and 19b can be performed by separate means. This makes it possible to concentrate a large force at the center when the product is broken.

The operating state of the connecting rod dividing apparatus having the above structure will be described below.

8A to 8C are a front view and a side view showing an operating state of a connecting rod dividing apparatus according to an embodiment of the present invention. FIG. 8A shows a state where the wedge is in the initial standby position, FIG. 8B shows the state where the wedge is in the first lowered position, FIG. 8C shows the state where the wedge is in the secondary As shown in FIG.

 First, the connecting rod 100 is set by using a large end holder block (not shown) and a small end holder block (not shown) in the lower jig (not shown) of the connecting rod dividing device and then raised to the working position .

Here, a well-known setting structure may be applied to the lower jig for setting the connecting rod, the large-end holder block, and the small-end holder block.

For example, the setting structure disclosed in Korean Patent No. 10-1284782 can be applied.

The first mandrel 12 and the second mandrel 14 including the wedge 11 are inserted into the large end portion of the connecting rod 100 raised to the working position and the preparation for the fracture splitting operation is completed That is, as shown in FIG. 8A, the wedge is placed in the initial standby position.

The operation of the wedge 11 at the center where the wedge is lowered by the cylinder 10 when the wedge is broken at the initial standby position is performed in two stages. For example, when the low speed (Fig. 8B). Then, the operation is terminated at a high speed in the second descent until the final division is made (Fig. 8C). Here, the low speed operation time and the high speed operation time can be appropriately set according to the specifications of the connecting rod and the like.

8B, when the wedge 11 is lowered for the first time (low speed), the wedge 11 at this time reaches the tapered position of the mandrels 12 and 14 Both auxiliary wedges 19a and 19b extend both slide plates.

8C, when the wedge 11 is lowered (high speed) for a second time, the wedge 11 passes at a high-speed inclined position of the mandrel 12 (14) The auxiliary wedges 19a and 19b on both sides are further lowered to simultaneously expand both slide plates at the time of breakage by the wedge 11 at the center.

At this time, since the inclined surface of the center wedge 11 is not in contact with the second inclined surface 24 of the first mandrel 12 and the second mandrel 14 but comes into contact with only the first inclined surface 23, It is possible to concentrate the product at the breaking site without being dispersed. Since the sliding guide is received by the LM guide 17 and the bearing 18 when the first slide plate 13 and the second slide plate 15 are extended (moved), frictional force is not generated, It is possible to concentrate on the fractured portion of the connecting rod without being dispersed.

The wedge 11 is raised by the operation of the cylinder 10 and the first and second mandrels 12 and 13 and the second mandrel 12 and When the second slide plate (15) is returned by the return spring (22), the entire lower jig including the divided connecting rods is lowered, and then the product is taken out, do.

As described above, by starting at a low speed at the beginning of the fracture splitting operation, it is possible to secure a time for taking a stable attitude between the wedge and the mandrel and the product (connecting rod), and the high speed is applied immediately before the product separation to minimize the deformation .

In addition, since the auxiliary wedges 19a and 19b serve to open the slide plate including the mandrel, the wedge 11 can concentrate on only breaking the product. As a result, It is possible to concentrate a large force on the region.

As described above, according to the present invention, by implementing the connecting rod breaking split method including the two-tapered structure of the mandrel, the bearing structure of the slide plate, and the extension structure of the slide plate using the auxiliary wedge, So that excellent breaking quality of the connecting rod can be ensured.

10: cylinder 11: wedge
12: first mandrel 13: first slide plate
14: second mandrel 15: second slide plate
16: Upper frame 17: LM guide
18: bearings 19a, 19b: auxiliary wedge
20: adapter block 21a, 21b: auxiliary cylinder
22: return spring 23: first inclined surface
24: second inclined surface 25: bearing bracket
26a, 26b: spring bracket 27: auxiliary spring
28: housing 29a, 29b: wedge groove
30: main body 31: wedge chuck
32: guide means 33a: lubricating oil supply passage
33b: lubricating oil supply hole

Claims (9)

An apparatus for fracturing a large end portion of a connecting rod in both directions,
A first mandrel (12) in contact with the inner surface of one end of the connecting rod, a second mandrel (14) in contact with one inner surface of the other end of the connecting rod, And a wedge (11) extending through the space between the first mandrel (12) and the second mandrel (14) to expand the first mandrel (12) and the second mandrel (14)
The inner circumferential surface inclination angle of the first mandrel (12) and the second mandrel (14) is set such that the inclination angle of the lower portion where the large end portion of the connecting rod is located is equal to the inclination angle of the wedge (11) And the inclination angle of the upper portion where the large end portion is not located is larger than the inclination angle of the wedge (11).
The method according to claim 1,
The first mandrel 12 and the second mandrel 14 are slid in a direction away from each other with the widening of the first mandrel 12 and the second mandrel 14 being positioned opposite to each other with respect to the wedge 11, The first slide plate 13 and the second slide plate 15 on which the first and second slide plates 13 and 15 and the second mandrel 14 are respectively installed and the first slide plate 13 and the second slide plate 15 Further comprising an upper frame (16) supporting the first and second slide plates (13, 15)
The first and second slide plates 13 and 15 are provided between the first and second slide plates 13 and 15 and the upper frame 16 when the first slide plate 13 and the second slide plate 15 are extended. Wherein a guide means for guiding the sliding of the connecting rod is provided.
The method of claim 2,
Wherein the guide means comprises an LM guide (17) provided between the upper surface of the first slide plate (13) and the second slide plate (15) and the lower surface of the upper frame (16) .
The method according to claim 2 or 3,
Wherein the guide means comprises a plurality of bearings (18) supported on the upper frame (16) side and in rolling contact with the bottom surfaces of the first slide plate (13) and the second slide plate (15) Directional dividing device.
The method of claim 2,
Both auxiliary wedges 19a and 19b which are disposed on both sides of the wedge 11 and descend together with the wedge 11 to open the first slide plate 13 and the second slide plate 15 to both sides, Further comprising: a connecting rod (20);
The method of claim 5,
The auxiliary wedges 19a and 19b are integrally installed in the adapter block 20 supported by the cylinder 10 by the cylinder 10 so that the auxiliary wedges 19a and 19b integrally with the wedge 11 integrally Wherein the connecting rod is movable downward.
The method of claim 5,
The auxiliary wedges 19a and 19b are provided on the rods of the auxiliary cylinders 21a and 21b separately from the cylinder 10 and can be operated by the auxiliary cylinders 21a and 21b separately from the wedge 11. [ Wherein the connecting rod is disposed on the connecting rod.
The method of claim 2,
The first slide plate 13 and the second slide plate 15 and the upper frame 16 so that the first mandrel 12 and the first slide plate 13, the second mandrel 14, And a return spring (22) serving to return the two slide plates (15).
The method according to claim 1,
The first mandrel 12 and the second mandrel 14 are provided with a lubricating oil supply passage 33b for supplying lubricating oil to the lubricating oil supply hole 33a formed at the boundary between the first inclined surface 23 and the second inclined surface 24, Wherein the connecting rod is divided into two portions.

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