JPH04111919A - Pulling device for material to be extruded - Google Patents

Abstract

PURPOSE:To pull the material to be extruded while applying a fixed tension by using the tension controller with a hydraulic cylinder together with the pulling speed controller of the puller body. CONSTITUTION:Because a puller jaw 7 is connected through a hydraulic cylinder 8 providing a relief valve 9 for adjusting the pulling force to the puller body 1 arranged in freely movable along the extruding direction of the outlet side of the extruder A, the tensile force of the material to be extruded B is kept constant by absorbing the variation of speed with the hydraulic cylinder 8 even if the pulling speed of the puller body 1 is varied. And the pulling can be executed while absorbing the speed variation and keeping the tension constant by installing the detecting means 10 to detect the relative movement of the puller jaw 7 and the puller body 1, feeding back this output to the pulling driving source 6 of the puller body 1 and automatically controlling the pulling speed of the puller body 1 so as to keep the relative position relation of the puller jaw 7 and the puller body 1 set at the initial time.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a towing method for extruded material, which is used to grasp the tip of an extruded forest being extruded from an extruder and tow it under a predetermined tension. Regarding equipment.

BACKGROUND ART Conventionally, this type of pulling device has been equipped with a puller body disposed on the outlet side of an extruder so as to be movable along the extrusion direction, and a puller jaw equipped on the body. The curvature of the extruded material is corrected by grasping the tip of the extruded material that is being extruded further, and pulling the extruded material with a puller body at a speed synchronized with the extrusion speed without applying a predetermined tension to the extruded material. What is called a runout puller is used. The traction force in such a device, that is, the tension applied to the extruded material, is adjusted by controlling the driving force of an electric motor, a hydraulic cylinder, etc., which are the traction drive source for the puller body.

Problems to be Solved by the Invention However, if the running resistance of the puller body due to the condition of the hair ring of the puller body, frictional force, etc. changes during the pulling process, the tension applied to the extruded material also changes. If the tension fluctuates in this way, the extruded material cannot be properly straightened, and the dimensional accuracy of the extruded material cannot be improved. In addition, depending on the type and cross-sectional shape of the extruded material, it may be necessary to pull at a low tension, but in such cases, if the running resistance of the puller body is large, it becomes increasingly difficult to pull at a constant and low tension. becomes.

This invention was made in order to solve the above-mentioned problems, and regardless of the fluctuation of the running resistance of the puller body, the magnitude of the same resistance, or the magnitude of the tension to be applied to the extruded material, it can be applied to the extruded material. It is an object of the present invention to provide a towing device for extruded material, which is capable of towing the extruded material while always applying a constant tension.

Means for Solving the Problems In order to achieve the above objects, the present invention provides a fluid pressure system in which a puller body disposed on the outlet side of an extruder so as to be movable along the extrusion direction is provided with a relief valve for adjusting traction force. While the puller jaw is connected via a cylinder, it is equipped with a detection means for detecting relative movement between the puller jaw and the puller body,
The output of the detection means is fed back to the traction drive source of the puller body, and the traction speed of the puller body is automatically controlled so that the puller jaw and the puller body maintain an initially set relative positional relationship. The gist of this invention is a traction device using extrusion, which is characterized by the following.

Function: The pulling device configured as described above grasps the tip of the extruded material being extruded from the extruder with a puller jaw, and pulls the extruded material at a speed matching the extrusion speed while applying a predetermined tension to the puller body. It is used by pulling it along the extrusion direction.

The tension applied to the extruded material is set by adjusting a relief valve of a fluid pressure cylinder that connects the puller jaw and the puller body.

By pulling the extruded material that is being extruded while applying a constant tension, the bending of the extruded material is corrected.

If the pulling speed of the puller body fluctuates for some reason, the fluid pressure cylinder will change the relative position of the puller jaw to the puller body, absorbing the fluctuation in the pulling speed and increasing the load on the extruded material. The applied tension is still held at a constant value. At the same time, the relative movement between the puller jaw and the puller body is detected by the detection means, and the output of the detection means is fed back to the drive source of the puller body, thereby moving the puller jaw and the puller body to the initially set relative position. The pulling speed of the puller body is automatically controlled to maintain the relationship.

Example The present invention will be explained below based on illustrated embodiments.

In Figure 1, (1) is the puller body, and the extruder (
Rail (2) arranged along the extrusion direction on the exit side of A)
It is movably arranged with wheels (1a) placed on top. The main body (1) has a traction chain (
3). This chain (3) consists of a pair of pulleys (4) and (5) arranged at both ends of the rail (2).
The puller body (1) is moved by an AC servo motor (6) as a driving source connected to one pulley (4).
It is designed to pull the material in the extrusion direction. It goes without saying that a wire or the like may be used in place of the chain (3), and it is also permissible to use, for example, a fluid pressure cylinder or the like as other traction means.

On the other hand, the puller body (1) is equipped with a puller jaw (7) for gripping and pulling the tip of the extruded material (B) being extruded from the extruder (A). The structure of the plagio (7) is not particularly limited as long as it can reliably chuck the extruded material (B). The puller jaw (7) is connected to the puller body (1) via a hydraulic cylinder (8) in such a manner that it projects toward the extruder side with a predetermined spacing between the puller jaws (7) and the puller body (1).

The hydraulic cylinder (8) functions to absorb fluctuations in the pulling speed of the puller body (1) and maintain the tension applied to the extruded material (B) at a constant value at all times. The tension can be easily set by adjusting hydraulic pressure by operating an electromagnetic relief valve (9) provided in the cylinder (8). Note that it is also permissible to use other fluid pressure cylinders in place of the above-mentioned hydraulic cylinder (8) as long as they provide the above-mentioned functions and effects.

A puller jaw (7) is provided on the upper part of the puller body (1).
A differential transformer (10
) or installed. An operating rod (11) is connected to the movable iron core of the transformer (10), and is in a state of protruding toward the puller jaw (7). When the plug El-(7) approaches the plug main body (1) more than the initially set distance, the tip of the operating rod (11) comes into contact with the puller jaw (7), causing the action to take place. The rod (11) is moved in and out. The movable core is moved along with this retraction operation, and an output voltage is generated according to the moved position.

This output voltage is fed back to the AC servo motor (6) which is the drive source for the traction chain (3). The number of revolutions of the motor (6) is automatically controlled according to the amount of feedback, that is, the output voltage of the differential transformer. Differential transformer (10
) functions as a detection means for detecting relative movement between the puller body (1) and the puller jaw (7), and therefore has such a function, and controls the traction drive source (6) by its output. It is also permissible to employ other detection means if possible.

Next, the operation of the above-mentioned traction device will be specifically explained.

The puller body (1) is placed close to the extruder (A) and extrusion is started. At the same time, puller body (1)
While moving in the extrusion direction in synchronization with the extrusion speed, the tip of the extruded material (B) extruded from the extruder (A) is chucked with the puller jaw (7). Then, this extruded material (B) is dragged by the puller body (1) at a pulling speed synchronized with the extrusion speed while applying a predetermined tension. The tension is set by adjusting the electromagnetic relief valve (9) of the hydraulic cylinder (8).

When the pulling speed of the puller body (1) matches the extrusion speed of the extruded material (B), the puller jaw (7) and the puller body (1) maintain the initially set distance, and the relief valve (9 ) is applied to the extruded material (B). If the pulling speed of the puller body (1) decreases due to changes in the running resistance of the puller body (1), etc., the puller jaw (7) will move toward the puller body (1) due to the action of the hydraulic cylinder (1). The tension is still maintained at a constant value by automatically narrowing the distance between the two. At the same time as this constant tension control, the operating rod (11) or puller jaw (7) of the differential transformer (10)
It is operated to move in and out when it comes into contact with. As a result, the movable core of the differential transformer (10) is moved relative to the fixed core, and an output voltage corresponding to the moved position is generated. This voltage is fed back to the AC servo motor (6), which is the drive source of the traction chain (3), and is automatically controlled to increase the rotational speed of the motor (6). As the rotational speed increases, the distance between the puller body (1) and the puller jaw (7) gradually increases, and when the initial setting distance is restored, the rotational speed of the motor (6) is held constant and the pulling speed becomes the extrusion speed. matches.

If the pulling speed of the puller body (1) increases,
A control opposite to that described above is performed.

As mentioned above, even if the pulling speed of the puller body (1) changes either up or down, it is pushed by moving relative to the puller jaw (7) or the puller body (1) by the action of the hydraulic cylinder (8). The tension applied to material 8 (B) is always kept constant, and at the same time, the pulling speed of the puller body (1) is automatically controlled so that the initially set distance between the puller jaw (7) and the puller body (1) is maintained. Ru.

Effects of the Invention As described above, the extruded material traction device according to the present invention has a puller body disposed on the outlet side of the extruder so as to be movable along the extrusion direction, and a fluid pressure puller body equipped with a relief valve for adjusting traction force. Since the puller jaws are connected via a cylinder, even if the pulling speed of the puller body fluctuates, the fluctuations are immediately absorbed by the fluid pressure cylinder and the tension of the extruded material is maintained at a constant value. . Moreover, a detection means for detecting the relative movement between the puller jaw and the puller body is equipped, and the output of the detection means is fed back to the traction drive source of the puller body, so that the puller jaw and the puller body are in an initially set relative positional relationship. Since the pulling speed of the puller body is automatically controlled to maintain the tension, even if the hydraulic cylinder length is short to absorb speed fluctuations and keep the tension constant, the puller body can maintain the full range of the pulling stroke length. It is possible to tow the extruded material while applying a constant tension. Therefore, the extruded material can be straightened accurately over its entire length, and its dimensional accuracy can be improved.

In addition, the tension applied to the extruded material is set by adjusting the relief valve of the fluid pressure cylinder, so even if the running resistance of the puller body is large, it is possible to easily and reliably apply a low tension. It is possible to tow while maintaining a constant low tension.

As described above, the traction device according to the present invention performs extrusion by using both tension control using a fluid pressure cylinder and traction speed control of the puller body by feeding back the relative movement between the puller jaw and the puller body. It is designed to tow the material while applying a constant tension. Therefore, the puller can be freely designed without limiting the weight of the puller main body as in the past, and it is possible to easily design the puller, and the equipment cost can be reduced.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an outline of an extruded material traction device according to an embodiment of the present invention. (1)... Puller body, (6)... Traction drive source, (
7)...Puller jaw (8)...Fluid pressure cylinder, (9)...Relief valve, (10)...Detection means,
(A)...extruder, (B)...extruded material. Patent applicant Ohashi Kikai Co., Ltd. Showa Aluminum Co., Ltd.

Claims (1)

[Claims] The puller body (1), which is disposed on the exit side of the extruder (A) so as to be movable along the extrusion direction, is connected to the puller jaw via a fluid pressure cylinder (8) equipped with a relief valve (9) for adjusting traction force. (7) is connected while the puller jaw (7)
and a detection means (
10), the output of the detection means (10) is fed back to the traction drive source (6) of the puller body (1),
An extruded material characterized in that the pulling speed of the puller body (1) is automatically controlled so that the puller jaw (7) and the puller body (1) maintain an initially set relative positional relationship. traction device.