JPH055213U - Extruder press dummy block changer - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a replacement device that can carry out replacement work of fixed dummy blocks safely and efficiently. [Structure] A replacement device for a fixed dummy block screwed to the tip of a stem of an extrusion press. A connecting rod having a screw shaft portion that faces the tip of the stem and can be screwed into the fixed dummy block is rotatably incorporated in the stem. A rotatable connecting rod is provided at the center of the crosshead that supports the stem. The connecting rod and the connecting rod are connected via a removable rotary joint. Rotating drive means for the connecting rod is provided at an external position of the crosshead, and the dummy block attached via the connecting rod is attached / detached by the forward / reverse rotation.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a fix dummy block changing device for an extrusion press, for example, for changing a fix dummy block connected to a stem integrally with a mandrel used for molding a hollow extruded product, and for changing the mandrel. The present invention relates to an exchanging device having a structure suitable for exchanging only a fixed dummy block connected to a stem when not in use.

[0002]

[Prior Art]

 When a hollow product is molded by an extrusion press, a mandrel is attached to the tip of a stem driven by a ram cylinder, and this mandrel is connected to the stem via a fixed dummy block. Such mandrels and fixed dummy blocks are replaced as needed by changing the specifications of dice and containers. This replacement can be done only by changing the mandrel (when the weight is to be held by the operator), or when the mandrel is not installed and the container liner diameter is changed. Although it may be replaced, the mandrel is usually large and heavy, so it is a work to remove the fixed dummy block together with the mandrel from the stem and replace it.

Conventionally, in such replacement work, since the fixed dummy block and the stem have a rotationally coupled structure such as screw fitting, a roller pedestal is arranged on the lower surface of the fixed dummy block integrated with the mandrel. Make preparations so that this roller pedestal can be suspended and supported by a crane or the like. Then, by using the roller support, a rotating lever is attached to the outer peripheral surface of the fixed dummy block, and the fixed dummy block is rotated so as to release the screw fitting and then removed from the stem. The procedure is the same when installing a new dummy block.

[0004]

[Problems to be solved by the device]

 However, in the conventional replacement work, when the fix dummy block is attached to and detached from the system as described above, the fix dummy block itself is held so as to be rotatable, and the roller pedestal and the like for holding the rotation must be suspended and supported. Since it does not happen, there was a drawback that work efficiency was very poor. In particular, since the mandrel and fixed dummy block are in a heated state, there is a problem in that the work of directly rotating the dummy block side is dangerous.

The object of the present invention is to provide a fix dummy block replacement device for an extrusion press, which pays attention to the above-mentioned conventional problems, and can perform a replacement work of a fixed damy block with a mandrel safely and efficiently. Especially.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, a fixing dummy block changing device of an extrusion press according to the present invention is a fixing dummy block changing device attached to a tip of a stem of an extrusion press, wherein the tip of the stem is The stem is rotatably equipped with a connecting rod that has a rotary joint that can be attached to the fixed dummy block, and the crosshead that supports the stem has a rotary joint that can be attached to and detached from the connecting rod. A connecting rod connected through the connecting rod is provided, and a rotating drive means for the connecting rod is provided. In this case, attachment / detachment positioning means for the rotary joint may be provided in the middle of the rotation transmission path from the rotation drive means to the connecting rod.

[0007]

[Action]

 According to the above construction, the rotation driving means provided on the crosshead side is rotated in the forward or reverse direction, and this rotation rotates the connecting rod in the stem through the connecting rod and the rotary joint. The connecting rod is rotated in the stem, and the screw shaft integrated with the connecting rod facing the tip of the stem is rotated. Therefore, by holding the fixture dummy block so as not to rotate, the screw fitting between the fixture dummy block and the screw shaft can be easily attached and detached. That is, it is possible to easily attach / detach by simply operating the rotary drive means installed on the cross head side without performing the rotating operation on the fixed dummy block side, and the replacement work of the fixed dummy block with mandrel. It is possible to greatly improve the sex.

[0008]

【Example】

 Hereinafter, a specific embodiment of a fixed dummy block exchanging device for an extrusion press according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional view of a main cross head 10 of an extrusion press equipped with a fixed dummy block exchanging device according to an embodiment. As shown in this figure, the rear end surface of the main cross head 10 is connected to a ram 14 via an end plate 12A, and is driven by the ram 14 in the left-right direction in the figure. The front plate 12B fixed to the front end surface of the main cross head 10 has a stem 18 attached thereto through a stem quick change mechanism section 16 utilizing a so-called bayonet mechanism, which is not shown in detail. The stem 18 is arranged so that its axis coincides with the machine center of the extrusion press, and is projected toward a container (not shown). A fixed dummy block 20 to be replaced is attached to the tip of the stem 18, and a mandrel 22 is attached to the tip of the fixed dummy block 20.

In such a configuration, the stem 18 has a through hole 24 at its axial center portion, and the connecting rod 26 concentrically arranged therein is rotatably inserted therein. The connecting rod 26 is provided with a screw shaft portion 28 capable of being screwed onto the fixed dummy block 20 at the tip end thereof. The screw rod portion 28 is formed on the fixed dummy block 20 by protruding from the tip end surface of the stem 18. The fixed dummy block 20 is tightly coupled to the tip surface of the stem 18 by being screwed onto the female screw portion 30. A nut member 32 is attached to the proximal end side of the connecting rod 26 so as to prevent the connecting rod 26 from coming out of the stem 18 when screwed, and this engages with the step surface of the enlarged diameter opening 24A of the through hole 24. I am letting you.

On the other hand, a connecting rod 34 concentrically arranged with the connecting rod 26 built in the stem 18 is rotatably inserted through the main crosshead 10 and the plates 12A, 12B arranged on both end surfaces thereof. Has been done. The insertion hole 36 of the connecting rod 34 is aligned with the machine center, and the opening 36A in the front plate 12B is expanded in diameter to correspond to the expanded opening 24A on the side of the stem 18, and both expanded openings 24A, 36A are formed. Thereby forming a space for accommodating a rotary joint 38 connecting the rods 26, 34 to each other.

The rotary joint 38 transmits the rotation of the connecting rod 34 to the connecting rod 26. In this embodiment, as shown in FIG. 2, the connecting rod 26 has a male portion 38A having a cross-shaped axial end, and a connecting portion. A so-called gear coupling structure is formed by fitting a cross-shaped female portion 38B attached to the shaft tip of the rod 34. The rotary joint 36 can be easily divided by separating the rods 26, 34 in the axial direction, and the rotary joint forms a rotary play of about 20 degrees forward and backward in terms of a rotation angle to facilitate connection. It is configured to be able to leave.

A rear end portion of the connecting rod 34 penetrates the main crosshead 10 and the end plate 12A, and is attached to a holding plate 40 mounted so as to cover a circular opening 36B formed on the outer surface of the end plate 12A. The flange 42 is attached to the end surface of the rod to prevent the rod from coming off. Therefore, the connecting rod 34 is rotatably held at a fixed position in the main crosshead 10 by the flange 42 and the female portion 38B of the rotary joint 38 at the rod tip. The circular opening 36B formed in the end plate 12A serves as a sprocket receiving portion described later.

Driving means 44 for imparting rotation to the connecting rod 34 as described above is installed above the main crosshead 10. That is, an installation base 46 is provided above the main cross head 10, and a hydraulic motor 48 serving as a rotational drive source is installed on the base 46. The hydraulic motor 48 is composed of a vane motor or the like, and a drive shaft 50 is connected to its output shaft via a joint 52. The drive shaft 50 is supported by a pair of bearings 54, and its axial center direction is set to be parallel to the connecting rod 34. In order to transmit the rotation of the drive shaft 50 to the connecting rod 34, a winding rotation transmission mechanism 56 is provided between the two.

The winding rotation transmission mechanism 56 is constituted by a chain 58 wound around the drive shaft 50 and the connecting rod 34 penetrating the main crosshead 10. For wrapping the chain 58, chain sprockets 60 and 62 are attached to the drive shaft 50 and the connecting rod 34. In order to attach the sprocket 62 to the connecting rod 34, the end plate 12A is formed with the circular opening 36B covered with the holding plate 40 as described above, and is accommodated inside. In order to chain-connect the sprocket 62 with the sprocket 60 of the drive shaft 50 arranged outside the main crosshead 10, the end plate 12A has a path of the chain 58 as shown in FIG. A groove 64 is formed along the groove. As a result, the rotation of the drive shaft 50 is transmitted to the connecting rod 34 via the chain 58 without interfering with the end plate 12A, the ram 14, and the like.

By the way, although the connecting rod 26 and the connecting rod 34 are connected by a removable rotary joint 38, it is necessary to perform proper fitting when the stem 18 is replaced. For this reason, attachment / detachment positioning means 66 for the rotary joint 38 is provided in the middle of the rotation transmission path from the rotating means 38 to the connecting rod 34. As shown in FIGS. 4 to 5, this has a rotary disc 68 integrally attached to the drive shaft 50, and a positioning hole 70 is formed at one location on the outer peripheral surface thereof along the radial direction. .. Further, a cylinder device 72 is installed on the installation base 46 at a side of the rotary disc 68, and a stopper block 74, which is moved forward and backward toward the rotary disc 68 by its drive, is connected to the cylinder device 72. The stopper block 74 is slidably held by a guide 76. Further, the stopper block 74 has a built-in stopper pin 78 that is biased to project toward the outer surface of the rotary disk 68 by an internal spring 76. Therefore, the stopper block 74 is moved forward by the cylinder device 72, and the stopper pin 78 elastically projected from the tip end surface thereof is brought into contact with the outer peripheral surface of the disk 68. When the rotary disk 68 is rotated by the drive shaft 50, the positioning hole 70 comes close to the stopper pin 78. When the positioning hole 70 reaches the contact position of the stopper pin 78, they are fitted to each other to prevent the drive shaft 50 from rotating. Such a position is set such that the direction of the cross hole of the rotary joint female portion 38B attached to the tip of the connecting rod 34 is aligned with the vertical and horizontal directions. Therefore, when the stem 18 is replaced, the rotary joint 38 can be attached or detached with reference to the female portion 38B which is always oriented in a fixed direction, so that the function of the quick change mechanism of the stem 18 is not impaired. Can be exchanged.

The replacement work of the fixed dummy block 20 of the extrusion press configured as described above is performed as follows.

First, when the fixed dummy block 20 is attached, the dummy block 20 is held so as not to rotate, and the female screw portion 30 is attached to the screw shaft portion 28 of the connecting rod 26 protruding from the tip of the stem 18. Can fit. In this state, the hydraulic motor 48 of the rotation driving means 44 is normally rotated. The rotation of the motor 48 is transmitted to the drive shaft 50 via the joint 54, and the chain 58 rotates the connecting rod 34 passing through the central portion of the main crosshead 10. Since the connecting rod 26 incorporated in the stem 18 is attached to the tip of the connecting rod 34 via the rotary joint 38, the connecting rod 26 is rotated.

At this time, the hydraulic motor 48 is first rotated at low speed and low pressure. As a result, the connecting rod 26 and the fixed dummy block 20 are screw-fitted. After this initial rotation, the hydraulic motor 48 is rotated at high speed and medium pressure until the tightening is completed. In this case, for example, the rotation speed is several tens of rpm, and the rotation speed is set to several tens Kg / cm ² . As a result, the fixed dummy block 20 with the mandrel 22 is attached to the tip of the stem 18.

When removing the fixed dummy block 20 with the mandrel, the reverse operation is performed, but this is performed by rotating the hydraulic motor 48 in the reverse direction. In this case, at the beginning of removal, the connecting rod 26 is rotated at a low speed and a high pressure to loosen the screw shaft portion 28 and the female screw portion 30 which are tightly adhered to each other. Then, after the fixed state is released, it is set to rotate at high speed and low pressure.

Such control is performed by the controller of the hydraulic oil supply control circuit for the hydraulic motor 48.

When the stem 18 is replaced, the cylinder device 72 of the positioning means 66 is driven to move the stopper block 74 forward while the rotation driving means 44 is being driven, and the stopper pin 78 is moved to the rotary disk 68. Abut the outer peripheral surface of. If it is in a simple contact state, the rotary disk 68 continues to rotate by the drive shaft 50, but when the positioning hole 70 reaches the contact position of the stopper pin 78, the stopper pin 78 is moved by the action of the built-in spring 76. It goes in and blocks the rotation of the rotating disc and thus the drive shaft 50. If the hydraulic motor 48 is stopped in this state, the cross hole forming the female portion 38B of the rotary joint 38 provided at the tip of the connecting rod 34 will be oriented vertically and horizontally, and the rotary joint will be attached or detached when the stem 18 is attached or detached. Positioning with the male part 38A is confirmed. As a result, a quick change of the stem 18 can be easily performed.

In the above embodiment, the rotary joint 38 has a cross shaft and cross hole fitting structure, but is not limited to this.

Further, in the above-described embodiment, an example in which the connecting structure of the stem 18 and the fixed dummy block 20 is performed by screw fitting is shown, but this can be applied to the structure of connecting by the bayonet mechanism. The connecting structure of the stem 18 and the fix dummy block 20 by this bayonet mechanism is shown in FIG. The spline shaft 80 is attached to the tip of the connecting rod 26 built in the stem 18, while the dummy block 20 side is provided with a mounting hole 84 having a spline groove 82 formed on the inlet side. The inner depth of the mounting hole 84 is an expanded diameter hole that allows the spline shaft 80 to rotate, and the spline shaft 80 can be prevented from coming off by rotating the spline shaft 82 by a half pitch. As a result, the fixed dummy block 20 can be attached and detached by rotationally driving the connecting rod 26 in the stem 18, so that the exchange operation can be easily performed by the above-mentioned exchange device. The mandrel 22 is screw-fitted to the fix dummy block 20. The mandrel 22 is provided with a tapered flange 86 on the mandrel 22 side and a countersink 88 is formed in the dummy block 20 for positioning. ing.

Even in the extrusion press having the connecting structure of the connecting rod 26 and the fixed dummy block 20 by such a bayonet mechanism, the mandrel-equipped dummy block 20 can be easily replaced by the exchanging device. Of course, as long as they are connected by the rotary connection structure, they can be applied to other mechanisms.

[0026]

[Effect of the device]

 As described above, according to the fix dummy block exchanging device of the extrusion press of the present invention, the connecting rod having the screw shaft portion that is exposed from the tip of the stem and can be screwed to the fix dummy block is rotatably attached to the stem. Since a connecting head that is built in and that supports the stem is provided with a connecting rod that is connected to the connecting rod through a removable rotary joint, and a structure that is provided with a rotating drive means for the connecting rod, It is possible to easily attach / detach by simply operating the rotary drive unit installed on the crosshead side without performing rotation operation on the fixed dummy block side, and the workability of replacing the fixed dummy block with mandrel is improved. Since it can be greatly improved, it is possible to use a fixed dame block with a mandrel. Effect can be implemented safely and efficiently the work is obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main crosshead portion of an extrusion press equipped with a fixed dummy block changing device according to an embodiment.

FIG. 2 is a sectional view of a rotary joint.

FIG. 3 is a cross-sectional view of an end plate showing a winding rotation transmission mechanism.

FIG. 4 is a plan view of a rotary drive portion.

FIG. 5 is a sectional view of positioning means.

FIG. 6 is an explanatory view of a case where a rotation connecting structure of a connecting rod of a stem and a fixed dummy block is a bayonet mechanism.

[Explanation of symbols]

 10 Main Cross Head 12A End Plate 12B Front Plate 14 Ram 18 Stem 20 Fix Dummy Block 22 Mandrel 26 Connecting Rod 28 Screw Shaft 34 Connecting Rod 38 Rotating Joint 44 Rotation Drive Means 48 Hydraulic Motor 50 Drive Shaft 56 Winding Rotation Transmission Means 58 Chain 66 Positioning means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Naoyuki Nishimura 1980, Okiyama, Ogushi, Ube, Yamaguchi Prefecture Ube Machinery Co., Ltd.

Claims (1)

Claims for utility model registration: 1. A fix dummy block replacement device mounted on the tip of a stem of an extrusion press, wherein the rotary coupling part is exposed from the tip of the stem and can be mounted on the fix dummy block. A connecting rod having a rotatably incorporated in a stem, and a connecting rod connected to the connecting rod via a rotary joint that is attachable to and detachable from the connecting rod is provided in a crosshead supporting the stem, and the connecting rod is rotated. A fixed dummy block exchanging device for an extrusion press, which is provided with driving means.