JP2010172910A - Device for rotating tie bar nut - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for rotating tie bar nut, where the attaching and removing of a tie bar nut are performed in a short period of time, and the drawing-out operation of the tie bar can be efficiently performed. <P>SOLUTION: The device for rotating tie bar nut is composed of: a tie bar nut rotating means 4 constituted of a motor 8 mounted on a supporting base 7, a pinion gear 9 fixedly provided to the output shaft 8a of the motor 8 and a pinion shaft 10 pivotally supported by the supporting base 7 and engaged with a tie bar nut 3 and the pinion gear 9; a tie bar pressing means 5 consisting of a tie bar pressing body 12 inserted into the square hole 11a of the body 11, a screw shaft 14 in which the rear part 14b is screwed and inserted into the screw hole 12a of the tie bar pressing body 12, and the top 14a is connected to one end of a link 13, a hydraulic cylinder 16 pivotally supported by a bracket 15 erected at the upper face of the body 11 and a piston rod 17 held so as to be freely advanced/retreated by the hydraulic cylinder 16, and whose tip part is pivotally supported by the link 13 via a fixing tool 17a; and an extended tie bar 6. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a tie bar nut rotating device used for loosening or tightening a tie bar nut in a tie bar pulling operation or the like of a horizontal molding machine performed at the time of a mold change. The present invention relates to a tie bar nut rotating device that can be rotated.

  In a mold clamping device (hereinafter referred to as a molding machine) such as a die casting machine or an injection molding machine, a fixed platen and a link housing are erected in a state where a fixed platen and a link housing face each other on both ends of the machine base. A movable platen is disposed between them. Four through holes are provided in communication with the four corners of the fixed platen to which the fixed mold is attached, the four corners of the movable platen to which the movable mold is attached, and the four corners of the link housing, Four tie bars are inserted through these through holes. A tie bar nut having a female screw part on the inner peripheral surface is fastened to the male screw part formed at both ends of each tie bar. That is, both ends of the four tie bars are respectively fixed to the fixed platen and the link housing by tie bar nuts, and the movable platen is slidable in the direction of the tie bar between the fixed platen and the link housing. Further, a mold clamping cylinder is installed between the movable platen and the link housing, and the movable platen moves forward or backward along the tie bar when driven by the mold clamping cylinder. As the movable platen advances, the movable mold closes with respect to the fixed mold, and a clamping force is generated between the two. Further, the fixed mold and the movable mold are opened by the retreat of the movable platen. The distance between the link housing and the stationary platen can be adjusted according to the thickness of the mold.

In the molding machine having such a structure, the tie bar tends to be an obstacle when the mold is replaced. Therefore, for example, in a molding machine that opens and closes a mold in a horizontal direction (hereinafter referred to as a horizontal molding machine), the upper tie bar can be pulled out in the direction of the link housing, and the tie bar can be inserted through the fixed platen again after the mold replacement. Done. In this case, it is necessary to rotate the tie bar nut in order to unscrew the tie bar nut at the end of the tie bar protruding to the fixed platen side.
Conventionally, the operation of rotating the tie bar nut has been performed by a method of lifting the end of the spanner with a crane or the like after the spanner is hung on the tie bar nut. However, in such a method, since it takes time to set the apparatus and to attach and remove the tie bar nut, there is a problem that work efficiency is poor.
In order to deal with such problems, research and development have been actively conducted in recent years on devices that improve the efficiency of tie bar pulling work by quickly attaching and removing tie bar nuts. In addition, some inventions and devices have already been disclosed in connection with them.

For example, Patent Document 1 discloses an invention relating to a “tie bar nut tightening and removal device” capable of producing an accurate tightening force when tightening a tie bar nut.
In the invention disclosed in Patent Literature 1, a tension nut is screwed into a thread portion of a tie bar protruding from a tie bar nut, and a rod is fixed to a member that is inserted into both end thread portions of the tie bar and fastened by the tie bar nut. The structure is such that the cylinder is pressed at a position farther than the distance between the fulcrum of the bar engaged with the tie bar tension nut and the tension nut.
Such a structure has the effect that the tie bar is pulled with a small force by the principle of the heel. Further, the tension force of the tie bar can be accurately determined by adjusting the pressure oil of the cylinder. This makes it possible to tighten the tie bar nut with an equal force.

Next, Patent Document 2 discloses an invention relating to a mold clamping device having a tie bar nut attaching / detaching device and a tie bar removing device under the name “die casting machine mold clamping device”.
The tie bar nut attaching / detaching device disclosed in Patent Document 2 includes two semi-circular tie bar nuts that are openable and closable that are screwed with a threaded portion of a tie bar with one end pivotally attached to the fixed platen side, and the tie bar nut. A link mechanism composed of a four-joint link that is pin-joined to each free end of the tie bar nut, and a tie bar nut opening / closing means comprising a hydraulic cylinder coupled to the four-joint link.
According to such a structure, since the tie bar nut is attached and detached via the link mechanism, the attachment and detachment is easy and easy, and the tie bar nut can be firmly screwed to the tie bar.

JP 2000-238101 A JP-A-8-117959

  However, since the invention disclosed in Patent Document 1 which is the above-described prior art has to manually rotate the tie bar nut, it takes a lot of time to attach and remove the tie bar nut, and the work efficiency is poor. was there.

  Further, the invention disclosed in Patent Document 2 has a problem that the tie bar nut has a large and complicated structure, which increases the number of parts and increases the manufacturing cost. Moreover, when attaching to the existing molding machine, there existed a possibility that the remodeling expense might increase.

  The present invention has been made in response to such a conventional situation, and provides a tie bar nut rotating device capable of efficiently pulling out a tie bar by attaching and removing the tie bar nut in a short time. The purpose is to do.

In order to achieve the above object, the tie bar nut rotating device according to the first aspect of the present invention is such that the fixed platen and the link housing are connected to each other by four tie bars, and are set up so that the plane faces the machine base. At least one of the tie bars is fixed to the fixed platen by a tie bar nut having a gear on the outer peripheral surface, and the tie bar is extracted from the link housing by releasing the fixation by the tie bar nut. In a molding machine, a support base installed on a fixed platen, a motor mounted on the support base, a pinion gear fixed to the output shaft of the motor, and a support base that is pivotally supported by the pinion gear and the tie bar nut And a pinion shaft that meshes with the pinion shaft.
The tie bar nut rotating device having such a structure has an effect that the pinion shaft meshing with the pinion gear and the tie bar nut meshing with the pinion shaft rotate integrally with the rotation of the motor. Then, by rotating the tie bar nut so as to move backward from the fixed platen and releasing the screwed state with the tie bar, the tie bar is released from the fixed platen and can be pulled outward.

The invention according to claim 2 is the tie bar nut rotating device according to claim 1, wherein the tie bar nut rotating device has a main body provided with a through hole and a screw hole in which a female screw portion is formed. A cylinder that is freely and slidably inserted into the through hole, a screw shaft that is screwed into a screw hole of the cylinder, and whose top is non-rotatably connected to one end of the link, and pivotally supported by the body And a piston rod that is supported by the hydraulic cylinder so as to be movable forward and backward, and whose tip is pivotally supported by the link. The cylinder is restricted from rotating by the through-hole of the main body, and the through-hole is opened. It protrudes from a part and is installed so that the end surface of a tie bar can be pressed.
In the tie bar nut rotating device having such a structure, a piston rod driven or driven forward by a hydraulic cylinder rotates a screw shaft through a link, and the screw shaft rotates in the through hole of the main body as the screw shaft rotates. The cylinder slides. And the end surface of a tie bar is pressed by the cylinder which protruded from the opening part of the through-hole of a main body. At this time, the tie bar nut screwed to the tie bar is pressed against the fixed platen, and the seating surface is in close contact with the fixed platen.

The invention according to claim 3 is the tie bar nut rotating device according to claim 1 or 2, wherein the outer surface has an extended male screw portion having the same diameter and the same pitch as the male screw portion of the tie bar. An extension tie bar is provided to be connected to the tie bar in a state where the end face is in contact with the end face of the tie bar, and the extension male screw part is formed to be continuous with the male screw part of the tie bar.
In the tie bar nut rotating apparatus having such a structure, the tie bar nut that rotates so as to move backward from the fixed platen by the driving force of the motor transmitted through the pinion shaft retracts the male screw portion of the tie bar, and then extends the tie bar nut. This has the effect of being screwed into the extended male screw portion. When the transfer of the tie bar nut to the extended tie bar side is completed, the tie bar is released from the fixed platen, and the tie bar can be pulled out of the fixed platen. In addition, when the extension tie bar screwed in advance with the tie bar nut is installed so that the extension male screw part is continuous with the male screw part of the tie bar, and the tie bar nut is rotated so as to advance toward the fixed platen, The tie bar nut has an action of moving from the extension tie bar to the tie bar. Furthermore, since the extension male screw portion is formed so as to be continuous with the male screw portion of the tie bar, the tie bar nut can be smoothly moved between the male screw portion of the tie bar and the extension male screw portion of the extension tie bar. It has the action.

  As described above, in the tie bar nut rotating device according to claim 1 of the present invention, the tie bar nut can be quickly and easily released from being fixed to the fixed platen. Therefore, the tie bar can be pulled out efficiently.

  In the tie bar nut rotating device according to claim 2 of the present invention, the tie bar nut is made difficult to loosen by pressing the end face of the tie bar with a cylinder after the tie bar nut is fastened to bring the seat surface into close contact with the fixed platen. it can.

  In the tie bar nut rotating device according to claim 3 of the present invention, it is possible to easily attach and remove the tie bar nut to the tie bar in a short time. Therefore, the efficiency of the tie bar pulling operation can be improved.

It is an external view of the Example of the tie bar nut rotating apparatus which concerns on embodiment of this invention. (A) And (b) is a front view of the tie bar nut rotation means and tie bar nut press means which comprise the tie bar nut rotation apparatus of a present Example, respectively. (A) is a rear view of the main body of a tie bar nut pressing means, (b) is a sectional view taken along line XX in FIG. (A) And (b) is the front view and side view of a tie bar press body, respectively. (A) And (b) is the front view and side view of a screw shaft, respectively. (A) And (b) is the front view and side view of an extension tie bar, respectively.

  A tie bar nut rotating device according to an embodiment of the present invention will be described with reference to FIGS. The tie bar nut rotating device of this embodiment is used in a tie bar pulling operation of a horizontal molding machine, and it is necessary that a gear be formed on the outer peripheral surface of the tie bar nut as will be described later. .

  FIG. 1 is an external view of an example of a tie bar nut rotating device according to an embodiment of the present invention. 2A and 2B are front views of the tie bar nut rotating means and the tie bar nut pressing means constituting the tie bar nut rotating device of the present embodiment, respectively. FIG. 3A is a rear view of the main body of the tie bar nut pressing means, and FIG. 3B is a cross-sectional view taken along line XX in FIG. 4A and 4B are a front view and a side view of the tie bar pressing body, respectively, and FIGS. 5A and 5B are a front view and a side view of the screw shaft, respectively. 6A and 6B are a front view and a side view of the extension tie bar, respectively. FIG. 1 is an enlarged view of a portion where the upper tie bar protrudes from the fixed platen and its vicinity in the horizontal molding machine. 3 to 6 show the components shown in FIGS. 1 and 2 in an enlarged manner.

The tie bar 2 has a male screw portion 2 a formed on the outer peripheral surface of the end portion, and a tie bar nut 3 is fastened to a protruding portion from the fixed platen 1. Further, on the inner peripheral surface and the outer peripheral surface of the tie bar nut 3, a female screw portion 3a and a gear 3b are formed, respectively.
Further, the tie bar nut rotating device of the present embodiment is installed at the tie bar nut rotating means 4 installed at the upper end of the fixed platen 1 and in front of the tie bar nut rotating means 4 (when viewed in the direction of arrow A). Tie bar pressing means 5 and an extended tie bar 6 connected to the tie bar 2 in a state where the end surface 6d (see FIG. 6B) is in contact with the end surface 2b. The tie bar nut rotating means 4 includes a support base 7 attached to the upper surface of the fixed platen 1, a motor 8 mounted on the support base 7, a pinion gear 9 fixed to an output shaft 8a of the motor 8, and a support. The pinion shaft 10 is supported by the base 7 and meshes with the tie bar nut 3 and the pinion gear 9.

  The tie bar pressing means 5 is a rectangular tube-shaped tie bar that is slidably inserted into a main body 11 and a square hole 11a provided in the main body 11 and can be protruded and retracted from an opening 18 on the molding machine side of the square hole 11a. The pressing body 12, the rear portion 14 b formed with the male screw portion is screwed into the screw hole 12 a of the tie bar pressing body 12, and the top portion 14 a is non-rotatably connected to one end of the link 13. A hydraulic cylinder 16 pivotally supported by a bracket 15 erected on the upper surface, and a piston rod 17 that is supported by the hydraulic cylinder 16 so as to be able to advance and retreat, and whose tip is pivotally supported by the link 13 via a fixture 17a. Is done. The main body 11 of the tie bar pressing means 5 is installed such that the center of the square hole 11a and the screw shaft 13 is parallel to the moving direction of the tie bar 2 (that is, the directions indicated by arrows A and B). 16 is swingable in a plane perpendicular to the directions indicated by arrows A and B. Further, the opening 18 on the molding machine side of the square hole 11a is enlarged in a stepped shape so that the front end 6a of the extension tie bar 6 can be rotatably held. The tie bar pressing means 5 can press the end surface 2b of the tie bar 2 through the extension tie bar 6 by the tie bar pressing body 12 protruding from the opening 18 on the molding machine side of the square hole 11a.

  Further, the extended tie bar 6 is formed with an extended male screw portion 6b having the same diameter and the same pitch as the tie bar 2 on the entire outer peripheral surface excluding the front end portion 6a, and a rotation restraining body 19 is fitted in the center of the end surface 6d. A square hole 6c is formed. The extended male screw portion 6 b is formed so as to be continuous with the male screw portion 2 a of the tie bar 2. The rotation restraining body 19 includes a front portion having a prismatic shape and a rear portion having a male screw portion 19a formed on the outer peripheral surface. The front portion is fitted into the square hole 6c of the extension tie bar 6, and the rear portion is It is screwed into a screw hole 2c provided at the center of the end surface 2b of the tie bar 2 (see FIG. 1).

In the tie bar nut rotating device having such a structure, the pinion shaft 10 meshing with the pinion gear 9 and the tie bar nut 3 meshing with the pinion shaft 10 rotate integrally with the rotation of the motor 8. When the tie bar nut 3 is rotated so as to move in the direction indicated by the arrow A in FIG. 1, the tie bar nut 3 retracts from the fixed platen 1 and retreats from the tie bar 2 to the extended tie bar 3 as indicated by a two-dot chain line. . When the movement of the tie bar nut 3 to the extended tie bar 6 is completed, the tie bar 2 is released from the fixed platen 1 and the tie bar 2 moves outward (in the direction indicated by the arrow B in FIG. 1). It can be pulled out. In addition, as shown by a two-dot chain line in FIG. 1, after the tie bar nut 3 is screwed into the extension tie bar 3 in advance and the extension tie bar 3 is attached to the tie bar 2 so that the end face 6d abuts the end face 2b, When the motor 3 is driven and rotated so that the tie bar nut 3 moves in the direction indicated by the arrow B in FIG. 1, the tie bar nut 3 moves forward toward the stationary platen 1. Then, as indicated by the solid line, the tie bar nut 3 moves from the extension tie bar 3 to the tie bar 2, and finally the tightening of the tie bar 2 is completed. The tie bar nut is formed so that the extended male screw portion 6 b is continuous with the male screw portion 2 a of the tie bar 2, and therefore, between the male screw portion 2 a of the tie bar 2 and the extended male screw portion 6 b of the extension tie bar 6. The tie bar nut 3 is smoothly moved.
Further, the linear motion of the piston rod 17 that is driven by the hydraulic cylinder 16 to move forward or backward is converted into a rotational motion by the link 13 and becomes a driving force for rotating the screw shaft 14. That is, by driving the hydraulic cylinder 16, the screw shaft 14 rotates. As the screw shaft 14 rotates, the tie bar pressing body 12 slides inside the square hole 11a of the main body 11, and the portion protruding from the opening 18 of the square hole 11a presses the end surface 2b of the tie bar 2. Has an effect. As a result, the tie bar nut 3 screwed into the tie bar 2 is pressed against the fixed platen 1, and the seat surface 3 c comes into close contact with the fixed platen 1.

  As described above, in the tie bar nut rotating device according to this embodiment, the tie bar nut 3 can be fastened and released from the fixed platen 1 quickly and easily. Therefore, it is possible to easily attach and remove the tie bar nut 3 to the tie bar 2 in a short time. Thereby, the efficiency of the extraction | drawer operation | work of the tie bar 2 improves. Further, after fastening the tie bar nut 3, the end surface 2 b of the tie bar 2 is pressed by the tie bar pressing body 12 through the extension tie bar 6, and the seat surface 3 c of the tie bar nut 3 is brought into close contact with the fixed platen 1. It can be made difficult to loosen.

  In this embodiment, the main body 11 is provided with the square holes 11a, but the present invention is not limited to this, and can be changed as appropriate. That is, it is sufficient that the rotation of the tie bar pressing body 12 can be restricted, and the through hole into which the tie bar pressing body 12 is inserted may have a shape other than a square hole, and the tie bar pressing body 12 also has a shape other than a square tube. A cylinder may be sufficient. Further, the front end 6a of the extension tie bar 6 is securely held by the opening 18 of the square hole 11a, and the positioning with respect to the tie bar 2 is accurately performed, and the rotation of the extension tie bar 6 is suppressed by the pressing force of the tie bar pressing body 12. In the case of rotation, the rotation inhibiting body 19 can be omitted. In this case, it is not necessary to process the screw hole 2c in the tie bar 2, and the existing tie bar can be used as it is, so that the remodeling cost is reduced. Further, when the extension tie bar 6 is reliably held and positioned by the rotation restraining body 19, it is not necessary to hold the front end portion 6a of the extension tie bar 6 by the opening portion 18 of the square hole 11a. Stepped processing can be omitted. Further, the extension tie bar 6 may be omitted, and the protruding amount from the opening 18 of the square hole 11a of the tie bar pressing body 12 may be lengthened to directly press the end surface 2b of the tie bar 2 with the tie bar pressing body 12. it can.

  The invention described in claims 1 to 3 can be applied to a mold clamping device such as an injection molding machine or a die casting machine when the tie bar nut is rotated to be removed from the tie bar or attached to the tie bar. .

DESCRIPTION OF SYMBOLS 1 ... Fixed platen 2 ... Tie bar 2a ... Male screw part 2b ... End surface 2c ... Screw hole 3 ... Tie bar nut 3a ... Female screw part 3b ... Gear 3c ... Seat surface 4 ... Tie bar nut rotation means 5 ... Tie bar press means 6 ... Extension tie bar 6a ... Front end portion 6b ... Extension male screw portion 6c ... Square hole 6d ... End face 7 ... Support base 8 ... Motor 8a ... Output shaft 9 ... Pinion gear 10 ... Pinion shaft 11 ... Main body 11a ... Square hole 12 ... Tie bar pressing body 12a ... Screw Hole 13 ... Link 14 ... Screw shaft 14a ... Top 14b ... Rear 15 ... Bracket 16 ... Hydraulic cylinder 17 ... Piston rod 17a ... Mounting tool 18 ... Opening part 19 ... Rotation restraint 19a ... Male thread

Claims (3)

The fixed platen and the link housing are connected to each other with four tie bars and are set up on the machine base so that the plane faces each other.
At least one of the tie bars is fixed to the fixed platen by a tie bar nut having a gear on the outer peripheral surface,
In a horizontal molding machine configured so that the tie bar is pulled out of the link housing by releasing the fixing with the tie bar nut,
A support base installed on the fixed platen;
A motor mounted on this support,
A pinion gear fixed to the output shaft of the motor;
A tie bar nut rotating device comprising: a pinion shaft that is pivotally supported by the support base and meshes with the pinion gear and the tie bar nut. A body provided with a through hole;
A cylindrical body having a screw hole in which a female screw portion is formed, and being inserted into the through hole so as to be slidable and slidable from the opening of the through hole;
A screw shaft that is screwed into the screw hole of the cylindrical body and whose top is non-rotatably connected to one end of the link;
A hydraulic cylinder pivotally supported by the body;
A piston rod which is held by the hydraulic cylinder so as to be movable forward and backward, and whose tip is pivotally supported by the link;
2. The tie bar nut according to claim 1, wherein the cylindrical body is constrained from being rotated by the through hole of the main body and protrudes from an opening of the through hole so as to be able to press an end face of the tie bar. Rotating device. An extension tie bar that has an extension male screw part having the same diameter and the same pitch as that of the male screw part of the tie bar on the outer peripheral surface, and is connected to the tie bar in a state where at least one end face is in contact with the end face of the tie bar. Prepared,
The tie bar nut rotating device according to claim 1, wherein the extension male screw part is formed to be continuous with the male screw part of the tie bar.