KR101335139B1 - Half-nut clamping apparatus for injection molding machine - Google Patents

Abstract

The present invention relates to a half nut fastening mechanism of an injection molding machine. The half nut fastening mechanism of the present invention is divided into a first split nut 110 and a second split nut 120 above and below a left tie bar 31, and a first split nut 110 and a second split. Left half nut 100 facing one side of the nut 120 is pivotally rotated toward the tie bar 31, respectively; The first split nut 210 and the second split nut 220 are divided into upper and lower sides of the right tie bar 32, and one side of the first split nut 210 and the second split nut 220 faces each other. A right half nut 200 which is pivotally hinged to each other so as to pivot open and close toward the tie bar 32; A driving source 300 disposed between the left half nut 100 and the right half nut 200; An extension arm 320 extending radially outward from the rotation shaft 310 of the drive source 300; A first rod (410) (510) rotatably hinged to one end of the extension arm (320), and the free end being slidably inserted into the first split nut (110) (210); A fixed end is rotatably hinged to the opposite end of the extension arm 320, and the free end includes second rods 410 and 510 that are slidably inserted into the second split nuts 120 and 220. . In the present invention, as the first and second rods are moved by the rotation of the extension arm, the split nuts of the respective half nuts are rotated at the same time, thereby simultaneously tightening and releasing.

Description

Half nut fastening mechanism of injection molding machine {HALF-NUT CLAMPING APPARATUS FOR INJECTION MOLDING MACHINE}

The present invention relates to a half nut fastening mechanism of an injection molding machine, and more particularly, to a half nut fastening mechanism of an injection molding machine capable of simultaneously fastening two left and right half nuts by a mechanical linkage between one driving source and a link device. It is about.

Referring to FIGS. 1 and 2, a general injection molding machine 2 includes a pair of molds 11 in which a cavity is formed in accordance with the shape of an article to be manufactured to form a mold and open a mold. 12, the stationary plate 10 and the movable plate 20 on which the molds 11 and 21 are mounted, the tie bar 30 for slidably guiding the movable plate 20, and the movable plate Conveying device 40 for transferring the 20 along the tie bar 30, and the half nut 50 to lock or unlock the movement of the movable die 20 by engaging or releasing the tie bar (30).

The injection molding machine 2 injects the molten resin into the cavity of the molds 11 and 21 in a state in which the molds 11 and 21 are joined, and after the injected molten resin is solidified, the mold is opened and the finished molded product is taken out.

Here, the tie bar 30 is installed in four places so that the upper, lower, left, right of the movable die 20 is fitted, the half nut 50 locks or releases the four tie bars 30 by the fastening device. .

Each half nut 50 is divided into two split nuts 51 and 52, and a tooth is formed on the inner surface thereof so as to be able to engage a tooth formed in the tie bar 30. By moving inwardly or outwardly in the radial direction of), by engaging or releasing the teeth formed in the tie bar 30, the moving die 20 is locked and restrained at the mating position or the moving die 20 is unlocked to the open position. Make it mobile.

This conventional fastening device of the half nut 50 is a complicated device (eg, fluid cylinder device 60 or other mechanism device) for operating the half nut 50 consisting of two split nuts 51, 52. Since the four tie bars 30 are made in the form of separate installation, there is a closing end that requires excessive installation and maintenance costs.

As shown in Fig. 2, when the half nut fastening device is composed of a fluid cylinder device 60 commonly employed in the prior art, one split nut 51 is connected to the piston rod 61, and the other split part. The nut 52 is connected to the cylinder 62 via the mounting plate 70, so that the split nuts 51 and 52 on both sides are opposed to each other by the relative movement of the piston rod 62 and the cylinder 62. It is configured to move linearly.

By the way, in the process of fastening the tie bar 30 by the fluid cylinder device 60, when the piston rod 61 pushes one split nut 51, one split nut moves first and the tie bar 30 is moved. ), And the other end is moved by the opposite direction of the force to show the fastening properties are completed. Accordingly, since the split nuts on both sides are engaged with the time difference without being engaged with the tie bars at the same time, not only a fastening time is required but also a phenomenon that the fastening (engagement) is displaced causes a problem that the apparatus is frequently stopped.

In addition, since every four tie bars must be provided with a single fastening device such as a fluid cylinder device independently, the failure of the fastening device itself or the fastening of the fastening device increases, thereby reducing productivity and increasing the cost of equipment and maintenance. do.

Conventionally, as the half nut fastening device, the abnormal fastening prevention device disclosed in Patent Literature 1 is known, but this is merely adding a device for improving the bite of the half nut and the tie bar with the existing fastening device as it is, The problem of using a separate drive source for each bar and the problem of using a fluid cylinder device does not fundamentally solve the problem, and the device becomes more complicated.

Moreover, the simultaneous fastening device disclosed by patent document 2 is known as a conventional half nut fastening device. This is a device for fastening both half nuts at the same time with one drive source, but the connection link structure of the drive source and the half nut is complicated. In addition, the direction of movement of the cylinder and the cross head and the direction of movement of the half nut are at right angles, so that the movement of the arm connecting the cross head and the half nut during the release operation cannot be completely switched to the movement of pulling the half nut. There is a problem that is made incompletely, there is a disadvantage that the half nut is not lifted in the axial direction, the movement in the left and right directions can not be made smoothly.

1. Republic of Korea Patent Publication No. 10-2004-0084319 2. Republic of Korea Patent Publication No. 10-2010-0045976

The present invention is to solve the conventional problems as described above, an object of the present invention is to simplify the structure of the fastening device by allowing two split nuts constituting one half nut to be operated and fastened at the same time by a simple structure and The present invention provides a half nut fastening mechanism of an injection molding machine that prevents fastening delay and poor engagement.

Still another object of the present invention is to fasten the half nut of an injection molding machine to simplify the apparatus and reduce the installation cost and the maintenance cost by simultaneously operating two left and right half nuts by a combination of one drive source and link device. To provide a mechanism.

In order to achieve the above object, the half nut fastening mechanism of the injection molding machine according to one direction of the present invention has a half nut engaged with or released from a tie bar for slidably moving the movable die, thereby locking or releasing the movement of the movable die. A half nut fastening mechanism of an injection molding machine for driving a screw, wherein the half nut is divided into a first split nut and a second split nut above and below a tie bar, and the opposite side of the first split nut and the second split nut. Each rotatably hinged to the movable die, and pivotally open and close toward the tie bar around the hinge point; A drive source is disposed opposite the hinge point of the first and second split nuts; Extension arms extending outward in both radial directions to the rotation axis of the drive source are formed in a single body; Fixed ends of the first rod and the second rod are rotatably hinged to both end portions of the extension arm about the rotation axis, respectively, and free ends of the first rod and the second rod are respectively divided into the first split nut and the second split. Slidably inserted into the nut; By rotating the rotary shaft and the extension arm in one direction or the opposite direction by the driving source, the positions of the hinge points of the fixed ends of the first rod and the second rod are moved and the free ends of the first rod and the second rod at the same time. And the sliding motion of the first split nut and the second split nut is rotated so that the first split nut and the second split nut are closed or opened about each hinge point to engage or release the tie bar. do.

The half nut fastening mechanism of the injection molding machine according to another direction of the present invention is an injection molding machine for driving a half nut for engaging or releasing a tie bar for guiding the movable die to be slidably movable to lock or release the movement of the movable die. A half nut fastening mechanism, wherein the half nut is divided into a first split nut on the upper side of the tie bar and a second split nut on the lower side of the tie bar, facing the first split nut on the upper side and the second split nut on the lower side. One side edge portion of the beam is hinged to the movable plate by a hinge axis, and is pivotally opened and closed toward the tie bar around the hinge point; A drive source is disposed opposite the hinge axis of the first and second split nuts; Extension arms extending outward in both radial directions to the rotation axis of the drive source are formed in a single body; Fixed ends of the first rod and the second rod are rotatably hinged to both end portions of the extension arm about the rotational axis, respectively, and free ends of the first rod and the second rod are respectively the upper and the first split nuts. Slidably penetrates the lower part of the two-split nut; By rotating the rotary shaft and the extension arm in one direction or the opposite direction by the driving source, the positions of the hinge points of the fixed ends of the first rod and the second rod are moved and the free ends of the first rod and the second rod at the same time. Is made to slide the first split nut and the second split nut so that the first split nut and the second split nut are rotated to close or open up and down about their respective hinge axes to engage or release the tie bars. It features.

The half nut fastening mechanism of the injection molding machine according to another direction of the present invention includes a left half nut and a right half nut which are engaged or released by a tie bar that guides the movable die in a sliding manner, thereby locking or releasing the movement of the movable die. A half nut fastening mechanism of an injection molding machine driven simultaneously, divided into a first split nut 110 and a second split nut 120 above and below a left tie bar 31, and with a first split nut 110. A left half nut 100 opposite to one side of the second split nut 120 rotatably hinged to the movable plate to pivot toward the tie bar 31 about the hinge point; The first split nut 210 and the second split nut 220 are divided into upper and lower sides of the right tie bar 32, and the opposite side of the first split nut 210 and the second split nut 220 is disposed. A right half nut 200 rotatably hinged to the movable plate to pivot toward the tie bar 32 about the hinge point; A driving source 300 disposed between the left half nut 100 and the right half nut 200; An extension arm 320 extending in a single body to both sides in the radial direction to the rotation shaft 310 of the driving source 300; Fixed ends are rotatably hinged to one end of the extension arm 320 about the rotation shaft 310, and each free end is a first split nut of the left half nut 100 and the right half nut 200. First rods 410 and 510 slidably inserted into the 110 and 210; Fixed ends are rotatably hinged to opposite ends of the extension arm 320 about the rotary shaft 310, and each free end is a second split nut of the left half nut 100 and the right half nut 200. And second rods 410 and 510 slidably inserted into the 120 and 220.

The half nut fastening mechanism of the injection molding machine according to another direction of the present invention includes a left half nut and a right half nut which are engaged or released by a tie bar that guides the movable die in a sliding manner, thereby locking or releasing the movement of the movable die. A half nut fastening mechanism of an injection molding machine driven simultaneously, divided into a first split nut 110 and a second split nut 120 on both upper and lower sides of the left tie bar 31, and the upper first split nut ( 110 and an outer edge portion of the lower second split nut 120 are hinged to the movable die by hinge shafts 112 and 122, respectively, so that the hinge shafts 112 and 122 are centered. A left half nut 100 pivotally opened and closed toward the tie bar 31; The first split nut 210 and the second split nut 220 are divided into upper and lower sides of the right tie bar 32, and the upper first split nut 210 and the lower second split nut 220 are divided into two parts. The opposite outer edges of the hinge shafts 212 and 222 are hinged so as to be rotatable on the movable dies, respectively, and rotate upward and downward toward the tie bars 32 about the hinge shafts 212 and 222. Right half nut 200; A driving source 300 disposed between the left half nut 100 and the right half nut 200; An extension arm 320 extending in a single body to both sides in the radial direction to the rotation shaft 310 of the driving source 300; Fixed ends are rotatably hinged to one end of the extension arm 320 about the rotation shaft 310, and each free end is a first split nut of the left half nut 100 and the right half nut 200. First rods 410 and 510 slidably inserted into guide holes 114 and 214 formed at 110 and 210; Fixed ends are rotatably hinged to opposite ends of the extension arm 320 about the rotary shaft 310, and each free end is a second split nut of the left half nut 100 and the right half nut 200. And second rods 410 and 510 slidably inserted into the guide holes 124 and 224 formed in the 120 and 220.

According to the half nut fastening mechanism of the injection molding machine according to the present invention, since the two split nuts are operated simultaneously by the fastening device of a simple structure, the structure of the fastening device is simplified, and a phenomenon such as a fastening delay or a misfit is prevented.

In addition, since the two half nuts are mechanically operated simultaneously by one driving source and a simple link structure without the fastening device being independently placed for every four half nuts, installation cost and maintenance cost are reduced and productivity is improved. Can contribute.

1 is a view showing an example of a typical injection molding machine.
FIG. 2 is a view seen from the left side of FIG. 1.
Figure 3 shows a half nut fastening mechanism according to the present invention, it is a view showing the half nut on the basis of the fastening state.
Figure 4 is a view showing the half nut fastening mechanism according to the present invention on the basis of the release state.

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

3 to 4 illustrate a half nut fastening mechanism according to the present invention. FIG. 3 is a view illustrating a half nut fastened state, and FIG. 4 is a view illustrating a released state.

3 to 4, the half nut fastening mechanism of the injection molding machine according to the present invention is such that the two split nuts constituting the half nut can be simultaneously fastened and released at the same time.

In addition, the left half nut 100 and the right half nut 200 disposed on both sides of the movable die plate (see '20' of FIG. 2) are simultaneously operated.

 In the following description, the left half nut 100 and the right half nut 200 are connected to one driving source at the same time, and described on the basis of an embodiment, but the tie bars have three or five injection molding machines that remain unpaired. The half nut provided in one tie bar can take and implement only the structure with respect to one half nut in FIGS. 3 and 4.

In addition, in the present specification and claims, for convenience of description, the direction is set to 'left' and 'right', but this is not necessarily limited to the half nuts on the left and the right. Therefore, the mechanism is also configured to fasten the half nut of the 'top' and the half nut of the 'bottom' at the same time.

3 to 4, in the half nut fastening mechanism of the present invention, the left half nut 100 and the right half nut 200 are two split nuts 110, 120, 210, and 220, respectively. It is divided into forms.

Specifically, the left half nut 100 is divided into a first split nut 110 on the tie bar 31 and a second split nut 120 on the bottom.

On the left tie bar 31 side, the one side (outside of drawing) corner part of the 1st split nut 110 and the 2nd split nut 120 which were divided | segmented up and down is hinge shaft 112 and 122. As shown in FIG. And rotatably hinged to the movable die. Therefore, the upper first split nut 110 and the lower second split nut 120 are rotated in the vertical direction toward the tie bar 31 about each of the hinge shafts 112 and 122.

Similarly, on the right tie bar 32 side, one side (outside the drawing) corner portion of the first split nut 210 and the second split nut 220 divided up and down is hinge shaft 212 ( 222 is rotatably hinged to the movable die. Accordingly, the upper first split nut 210 and the lower second split nut 220 are rotated in the vertical direction toward the tie bar 32 about the hinge shafts 212 and 222.

In addition, the half nut fastening mechanism of the present invention is a monolith in the radial direction on both sides of the drive source 300 disposed between the left half nut 100 and the right half nut 200 and the rotation shaft 310 of the drive source 300. And an extension arm 320 extending to. The drive source 300 may be configured as a motor, in which case the rotary shaft 310 becomes the final output shaft via the reducer from the shaft of the motor or the shaft of the motor.

The fixed ends of the first rods 410 and 510 of both sides are rotatably hinged by the hinge shaft 322 to one end of the extension arm 320, and a second end of the extension arm 320 is opposite to the second end of the extension arm 320. The fixed ends of the rods 420 and 520 are rotatably hinged by the hinge shafts 324, respectively.

The free end of the first rod 410 on the left side is slidably inserted into (or passes through) the guide hole 114 formed in the upper end of the first split nut 110 of the left half nut 100, and the second rod The free end of 420 is slidably inserted into (or passes through) the guide hole 124 formed in the lower end of the second split nut 120.

Similarly, the free end of the first rod 510 on the right side is slidably inserted into (or passes through) the guide hole 214 formed in the upper end of the first split nut 210 of the right half nut 200. The free end of the second rod 520 is slidably inserted into (or passes through) the guide hole 224 formed in the lower end of the second split nut 220.

Accordingly, when the rotation shaft 310 and the extension arm 320 rotate in one direction or the opposite direction by the driving source 300, the fixed ends of the first rods 410 and 510 and the second rods 420 and 520 are rotated. The position of the hinge point (center of the hinge axis 322) is moved. Simultaneously with the movement of the hinge point, free ends of the first rod 410 and the second rod 420 connected to the left half nut 100 guide the first split nut 110 and the second split nut 120. When the sliding motion of the balls 114 and 124 is made, the first split nut 110 and the second split nut 120 rotate in a vertical direction about the hinge shafts 112 and 122. Received or retracted toward the tie bar 31 is received or engaged with the tie bar 31 or released from the tie bar 31. Similarly, at the same time as the hinge point moves, free ends of the first rod 510 and the second rod 520 connected to the right half nut 200 of the first split nut 210 and the second split nut 220 When the sliding motion of the guide holes 214 and 224 is made, the first split nut 210 and the second split nut 220 are vertically retracted about the hinge shafts 212 and 222. The force is rotated or unfolded toward the tie bar 32 to be pinched or opened to engage the tie bar 32 or released from the tie bar 32.

As described above, the present invention primarily allows two split nuts of one half nut to be mechanically fastened and released simultaneously.

That is, the one half nut 100 is the first divided by moving the first rod 410 and the second rod 420 at the same time by the one direction or the opposite direction rotation of the drive source 300 and the extension arm 320 By rotating the nut 110 and the second split nut 120 in the opposite direction at the same time, the two split nuts 110 and 120 are simultaneously engaged and released without time difference.

The above drive scheme applies equally to all half nuts. That is, when the half nut 200 on the right side is described as an example, the one half nut 200 is formed by the first rod 510 and the second rod by one or opposite rotations of the driving source 300 and the extension arm 320. The rods 520 simultaneously move in opposite directions to simultaneously rotate the first split nut 210 and the second split nut 220 in opposite directions so that the two split nuts 210 and 220 are simultaneously fastened and released without time difference.

Therefore, the two split nuts are not fastened with a time difference as in the prior art, but are mechanically determined and operated simultaneously by the framework of the mechanism which is not subject to change, thereby eliminating the problem of delayed fastening time and engaging when fastening. No shift occurs.

In addition, the present invention allows two half nuts to be operated simultaneously in conjunction with one drive source, so that two half nuts on both sides are mechanically simultaneously by one drive source without placing the fastening device independently for every four half nuts. To make it work.

3 is a view showing a state in which the half nut is fastened to the tie bar (locked state), and FIG. 4 is a state in which the half nut is released from the tie bar to which the half nut is fastened.

As shown in FIG. 3, when the driving source 300 rotates clockwise, the hinge shaft 322 of the first rods 410 and 510 and the hinge shaft 324 of the second rods 420 and 520 are rotated. The position moves in a direction closer to the half nut 100, 200, whereby the first rods 410, 510 and the second rods 420, 520 attempt to narrow each other (arrows in the drawing). Direction), the first split nut 110, 210 and the second split nut 120, 220 is rotated in the closing direction to engage the tie bars (31) (32).

As shown in FIG. 4, when the driving source 300 rotates counterclockwise, the hinge axis 322 of the first rod 410 and 510 and the hinge axis 324 of the second rod 420 and 520 are rotated. Is moved in a direction away from the half nut 100, 200, whereby the first rod 410, 510 and the second rod 420, 520 move away from each other (arrows in the drawing). Direction), the first split nut 110, 210 and the second split nut 120, 220 is rotated in the opening direction to be engaged with the tie bars (31) (32).

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. In addition, the embodiments of the present invention as described above can be variously modified and equivalent other embodiments by those of ordinary skill in the art within the technical spirit of the present invention, such modifications and equivalent other embodiments are naturally It belongs to the appended claims of the present invention.

2: injection molding machine
10: fixed template
20: movable template
21: guide part
31, 32: tie bar
40: transfer device
100: left half nut
110, 210: First split nut
112, 212, 122, 222, 322, 324: hinge axis
114, 214: Guideman
120, 220: second split nut
300: drive source
310:
320: extension arm
410, 510: first rod
420 and 520: second load

Claims (4)

A half nut fastening mechanism of an injection molding machine for driving a half nut which is engaged or released by a tie bar for slidably guiding the movable die, thereby locking or releasing the movement of the movable die.
The half nut is divided into a first split nut and a second split nut above and below the tie bar, and one side of the first split nut and the second split nut facing each other is rotatably hinged to the movable plate to correspond to the hinge point. Pivotally open and close toward the tie bar;
A drive source is disposed opposite the hinge point of the first and second split nuts;
Extension arms extending outward in both radial directions to the rotation axis of the drive source are formed in a single body;
Fixed ends of the first rod and the second rod are rotatably hinged to both end portions of the extension arm about the rotation axis, respectively, and free ends of the first rod and the second rod are respectively divided into the first split nut and the second split. Slidably inserted into the nut;
By rotating the rotary shaft and the extension arm in one direction or the opposite direction by the driving source, the positions of the hinge points of the fixed ends of the first rod and the second rod are moved and the free ends of the first rod and the second rod at the same time. And the sliding motion of the first split nut and the second split nut is rotated so that the first split nut and the second split nut are closed or opened about each hinge point to engage or release the tie bar. Half nut fastening mechanism of injection molding machine. A half nut fastening mechanism of an injection molding machine for driving a half nut which is engaged or released by a tie bar for slidably guiding the movable die, thereby locking or releasing the movement of the movable die.
The half nut is divided into a first split nut on the upper side of the tie bar and a second split nut on the lower side of the tie bar, and the opposite one corner portions of the first split nut on the upper side and the second split nut on the lower side respectively. Hingedly rotatable to the movable platen by a hinge axis and pivotally opened and closed toward the tie bar around the hinge point;
A drive source is disposed opposite the hinge axis of the first and second split nuts;
Extension arms extending outward in both radial directions to the rotation axis of the drive source are formed in a single body;
Fixed ends of the first rod and the second rod are rotatably hinged to both end portions of the extension arm about the rotational axis, respectively, and free ends of the first rod and the second rod are respectively the upper and the first split nuts. Slidably penetrates the lower part of the two-split nut;
By rotating the rotary shaft and the extension arm in one direction or the opposite direction by the driving source, the positions of the hinge points of the fixed ends of the first rod and the second rod are moved and the free ends of the first rod and the second rod at the same time. Is made to slide the first split nut and the second split nut so that the first split nut and the second split nut are rotated to close or open up and down about their respective hinge axes to engage or release the tie bars. A half nut fastening mechanism of an injection molding machine. A half nut fastening mechanism of an injection molding machine for simultaneously driving a left half nut and a right half nut which are engaged or released by a tie bar for slidably moving the movable die, thereby locking or releasing the movement of the movable die.
The first split nut 110 and the second split nut 120 are divided into upper and lower sides of the left tie bar 31, and one side of the first split nut 110 and the second split nut 120 faces each other. A left half nut 100 rotatably hinged to the movable plate to pivot toward the tie bar 31 about the hinge point;
The first split nut 210 and the second split nut 220 are divided into upper and lower sides of the right tie bar 32, and one side of the first split nut 210 and the second split nut 220 faces each other. A right half nut 200 rotatably hinged to the movable plate to pivot toward the tie bar 32 about the hinge point;
A driving source 300 disposed between the left half nut 100 and the right half nut 200;
An extension arm 320 extending in a single body to both sides in the radial direction to the rotation shaft 310 of the driving source 300;
Fixed ends are rotatably hinged to one end of the extension arm 320 about the rotation shaft 310, and each free end is a first split nut of the left half nut 100 and the right half nut 200. First rods 410 and 510 slidably inserted into the 110 and 210;
Fixed ends are rotatably hinged to opposite ends of the extension arm 320 about the rotary shaft 310, and each free end is a second split nut of the left half nut 100 and the right half nut 200. (120) (220) Half nut fastening mechanism of the injection molding machine comprising a second rod 410, 510 is slidably inserted. A half nut fastening mechanism of an injection molding machine for simultaneously driving a left half nut and a right half nut which are engaged or released by a tie bar for slidably moving the movable die, thereby locking or releasing the movement of the movable die.
The first split nut 110 and the second split nut 120 are divided into upper and lower sides of the left tie bar 31, and the upper first split nut 110 and the lower second split nut 120 are separated. The outer edges facing each other are hinged to the movable plate by hinge shafts 112 and 122, respectively, so that they rotate upward and downward toward the tie bar 31 about the hinge shafts 112 and 122, respectively. Left half nut 100;
The first split nut 210 and the second split nut 220 are divided into upper and lower sides of the right tie bar 32, and the upper first split nut 210 and the lower second split nut 220 are divided into two parts. The opposite outer edges of the hinge shafts 212 and 222 are hinged so as to be rotatable on the movable dies, respectively, and rotate upward and downward toward the tie bars 32 about the hinge shafts 212 and 222. Right half nut 200;
A driving source 300 disposed between the left half nut 100 and the right half nut 200;
An extension arm 320 extending in a single body to both sides in the radial direction to the rotation shaft 310 of the driving source 300;
Fixed ends are rotatably hinged to one end of the extension arm 320 about the rotation shaft 310, and each free end is a first split nut of the left half nut 100 and the right half nut 200. First rods 410 and 510 slidably inserted into guide holes 114 and 214 formed at 110 and 210;
Fixed ends are rotatably hinged to opposite ends of the extension arm 320 about the rotary shaft 310, and each free end is a second split nut of the left half nut 100 and the right half nut 200. Half nut fastening mechanism of the injection molding machine, characterized in that it comprises a second rod 410, 510 slidably inserted into the guide hole (124, 224) formed in (120) (220).

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