KR20130068739A - Half-nut clamping apparatus for injection molding machine - Google Patents

Abstract

PURPOSE: A half nut clamping device for an injection molding machine is provided to precisely assemble by correcting and absorbing in a process using a pressurizing member and to uniformly fit a clamping force two split nuts and both sides of the half nut. CONSTITUTION: A half nut clamping device for an injection molding machine comprises the half nut(1000), a connecting block(6100), a piston(6110), and a pressurizing member. The half nut is divided to first and second split nuts(1010,1020). The piston is inserted into a cylinder(1022) formed on the second split nut. The pressurizing member is interposed between the cylinder and the piston and pressurizes the cylinder and the piston to be far.

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, when fastening a split nut of a half nut by mechanical linkage between a drive source and a link device, it is possible to precisely assemble and absorb a link length error. A half nut fastening mechanism of an injection molding machine for providing a fastening force.

Referring to FIG. 1, a general injection molding machine includes a pair of molds 11 and 21, 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, respectively. A tie bar 30 and a movable bar 20 to guide the movable plate 20 so as to be slidable, and the movable plate 20 to which the stationary plate 10 and the movable plate 20 to which the molds 11 and 21 of the present invention are mounted. And a half nut 50 for locking or releasing the movement of the movable die 20 by engaging or releasing the transfer device 40 and the tie bar 30 to move along the 30.

Such an injection molding machine injects 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 solidifies, molds are removed to take out the finished molded product.

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.

Each half nut 50 is divided into two split nuts, and the inner surface is provided with a tooth which can engage with the teeth formed in the tie bar 30, and in the radial direction of the tie bar 30 by the fastening device. By moving inward or outward by engaging or releasing the teeth formed on the tie bar 30, the state in which the movable template 20 can be locked and restrained at the mating position or the unlocking of the movable template 20 can be moved to the mold opening position Be sure to

Such a drive mechanism of the half nut 50 has a complicated fastening device (for example, a hydraulic cylinder device or other mechanism device) for operating the half nut 50 composed of two split nuts. There was an end to the excessive installation and maintenance costs because each 30) is a separate installation.

In addition, due to frequent failure of each fastening device, a phenomenon in which the fastening operation or the release operation is incompletely occurred in some of the four hydraulic cylinder devices has a problem that the process is frequently stopped.

In addition, the conventional fastening device mainly uses a hydraulic cylinder device, the hydraulic cylinder device has a characteristic that the piston rod and the cylinder is reacted with each other to move the two split nuts in the opposite direction, until the piston rod or Only the split nut connected to one of the cylinders moves, and only when the split nut touches the tie bar and reacts, the other piston rod or the split nut connected to the cylinder moves and is fastened to the tie bar. For this reason, when two split nuts are fastened at a time difference, the half nut fastening time is delayed and there is a problem that the engagement is shifted, and there existed a closed end which frequently stops injection equipment.

In order to solve this problem, the inventors have developed a half nut fastening mechanism as shown in Figs.

The half nut fastening mechanism shown in FIGS. 2 and 3 divides the left half nut 100 and the right half nut 200 into first and second split nuts 110, 120, 210, and 220, respectively. Through the first connecting bar 300, the second split nut 120 of the left half nut 100 and the first split nut 210 of the right half nut 200 are integrally connected, and the second connecting bar 400 is connected. The first split nut 110 of the left half nut 100 and the second split nut 220 of the right half nut 200 are integrally connected to each other through the second split nut 120 of the left half nut 100. ) And the second split nut 220 of the right half nut 200 with the rotary pulley 510 and the slider crank mechanism 600, 600a, and the rotary pulley 510 clockwise by the drive source 700. Or it is made of a structure that rotates counterclockwise.

The half nut fastening mechanism simultaneously moves the second split nuts 120 and 220 of the left and right half nuts 100 and 200 by bidirectional angular movement of the rotary pulley 510 by the driving source 700. By moving in the opposite direction, the first split nut 110, 210 on the opposite side which is integrally connected to them is also moved in the opposite direction at the same time.

Such a half nut fastening mechanism prevents misalignment and a fastening delay by simultaneously operating two split nuts at a time difference by a simple link mechanism, while fastening two half nuts and By releasing them at the same time, it is advantageous to simplify the structure of the fastening device and to reduce the installation cost and the maintenance cost.

However, such a fastening mechanism requires that the length of the left and right links be precisely adjusted when the half nut is fastened by the slider crank mechanism 600 (600a), so that the fastening force (the force engaged with the tie bar) of the two split nuts becomes uniform. However, it is necessary to strictly control the dimensional tolerances (machining tolerances and positional tolerances) of the respective link parts.

In order to strictly control the dimensional tolerances of each part, it is necessary to use more precise machining methods than necessary and to inspect the parts more time and effort. The fastening mechanism will be more useful.

In the half nut fastening mechanism having the link structure, manufacturing tolerances accumulate in the length of the link, or when there is a machining deviation between the link devices on both sides, accurate assembly is impossible or the half nut is incompletely tightened even when assembled. do. In addition, the force is non-uniform between the two split nuts and between the two half nuts, the fastening is not made completely, the force is deflected to generate a moment.

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

It is therefore an object of the present invention to provide a half nut fastening mechanism of an injection molding machine that absorbs the length error of the link to enable precise assembly and to provide a uniform fastening force.

In order to achieve the above object, the half nut fastening mechanism of the injection molding machine according to the present invention includes a half nut divided into first and second split nuts; A connection block to which the end of the drive link device is connected; A piston slidingly inserted into a cylinder formed on the second split nut; It is interposed between the piston and the cylinder and comprises a pressurizing body for pressing the piston and the cylinder in a direction away.

In the half nut fastening mechanism of the injection molding machine according to the present invention, when the half nut is divided into first and second split nuts, and the second split nut is moved by the drive link device, the first split nut is interlocked in the opposite direction. A half nut fastening mechanism of an injection molding machine for engaging or releasing the first and second split nuts at the same time with the tie bar, the cylinder being formed on either of the connecting blocks forming the ends of the link device and the second split nut facing each other; A piston which is formed on the other side of the connection block and the second split nut that is slid into the cylinder; A press body filled in the cylinder to press the end face of the piston in an axial outward direction; And a guide and a stopper for mounting the connecting block at a distance G1 with respect to the second split nut, and for allowing and guiding an axial sliding movement of the second split nut within the gap G1. .

In one embodiment, the pressing member is preferably composed of an elastic member that elastically presses the end face of the piston, and is preferably composed of a spring among the elastic members, and in the case of a spring, a plurality of plate springs are overlapped. It can be configured in the form.

Alternatively, the pressurized body may be made of a fluid that is filled in the cylinder by a fluid source and pressurizes the piston end surface.

In this case, a seal is provided between the outer circumference of the piston and the inner circumference of the cylinder to form a fluid passage for supplying or discharging the fluid to the cylinder, the fluid passage extending from a hydraulic source. It is preferable to connect the fluid pipe.

According to the half nut fastening mechanism of the injection molding machine according to the present invention, even if there is some error or deviation in the length of the mechanism for moving the half nut, that is, the link device including the connection block, it is absorbed and corrected in the assembling process using the press body. This makes it possible to assemble in an accurate and complete state as well as to equally tighten the clamping force of the two split nuts and the half nuts on both sides.

1 is a view showing a typical injection molding machine.
Figure 2 is a perspective view showing a half nut fastening mechanism improved by the present inventors.
3 is a front view showing only the half nut fastening mechanism of FIG.
4 is a view showing a configuration of a half nut fastening mechanism according to an embodiment of the present invention, showing a state in which the half nut is released from the tie bar.
5 is a view showing a configuration of a half nut fastening mechanism according to an embodiment of the present invention, showing a state in which the half nut is fastened to a tie bar.
6 is a view showing a configuration of a half nut fastening mechanism according to another embodiment of the present invention, showing a state in which the half nut is released from the tie bar.
7 is a cross-sectional view of FIG. 6.

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

4 to 5 show the configuration of the half nut fastening mechanism according to an embodiment of the present invention, Figure 4 is a view showing a state in which the half nut is released from the tie bar, Figure 5 The figure shows the state in which the nut is fastened to the tie bar. Although the following drawings show and explain only the half nut part of one side (right side) in FIG. 3, the half nut part of the opposite side (left side) in FIG. 3 also has the same structure. In addition, in order to avoid the confusion with FIG. 3, the reference | symbol of a half nut and a linkage apparatus is attached | subjected and demonstrated. Even if the reference signs are different, the same names are the same elements. In addition, the reference numeral '6100' replaces '630' and '630a' of FIG. 3 and is an element forming the end of the link device.

In the half nut fastening mechanism of the present invention shown in FIGS. 4 to 5, as described above with reference to FIGS. 2 to 3, the half nut 1000 is divided into first and second split nuts 1010 and 1020. When the second split nut 1020 is moved by the drive link device, the first split nut 1010 is interlocked in the opposite direction so that the first and second split nuts 1010 and 1020 mesh with the tie bar 30 at the same time. It is intended to be released.

Referring to FIG. 4, in the half nut fastening mechanism, the cylinder 1022 may be formed on either of the connecting block 6100 and the second split nut 1020 that form the end of the driving link device. On the other side, a piston 6110 which is slid into the cylinder 1022 is formed, and the cylinder 1022 is filled with a pressurized body, and the end face of the piston 6110 is axially outwardly by the pressurized body. In order to pressurize, the filling amount of the pressurizing body is adjusted during assembly to absorb (or correct) the dimensional error (short or long) of the linkage.

In the present specification, the cylinder 1022 is formed in the second split nut 1020, and the piston 6110 is shown and described in the form formed in the connection block 6100, but it is naturally acceptable to form the reverse. That is, the cylinder 1022 may be formed in the connection block 6100, and the piston 6110 may be formed in the second split nut 1020.

In addition, the connection block 6100 is mounted to the second split nut 1020 by a guide and a stopper 6200. The guide and the stopper 6200 maintain and mount the connection block 6100 with respect to the second split nut 1020 with respect to the second split nut 1020, and the second split nut 1020 of the second split nut 1020 within the gap G1. It permits and guides axial sliding.

In the present embodiment, a specific configuration of the guide and the stopper 6200, the guide hole 6102 is formed in the connecting block 6100, the guide shaft 6210 longer than the length of the guide hole 6102. ) Is passed through the guide hole (6102) and the screw (6212, 1024) is fastened to the second split nut (1020). In addition, the guide shaft 6210 is configured in a form in which a stopper 6220 which stops the connection block 6100 is attached to its head (that is, a stopper shaft), or a separate stopper 6220 is fitted. It can be configured as.

In this case, the gap G1 between the connection block 6100 and the second split nut 1020 changes the length of the guide shaft 6210, or replaces the thickness of the stopper 6200 with another or increases or decreases the number. Adjust it.

In the present embodiment, the press body may be configured of an elastic member 2010 for elastically pressing the end face of the piston 6110. As the elastic member 2010, for example, a spring, an elastic object, or the like can be used.

As the spring, a coil spring, a leaf spring, or the like can be used, and in particular, it is preferable that the spring is constituted by a disc spring as shown in FIG. 4. The plate spring preferably has a structure in which a plurality of springs overlap, and the stacking method may be a series (overlapping in the same direction), a parallel (overlapping in the opposite direction), or a combination of serial and parallel as shown in the drawings. Can be.

Thus, when the plate spring is used as the elastic member 2010, by increasing or decreasing the number of overlaps of the plate spring, the dimensional error of the linkage device can be easily absorbed or corrected, and the split nuts 1010 and 1020 at the time of tightening the plate. Since the tie bar 30 is always pressed by the elastic compression force of the spring to be engaged, the firmly pressed state can be maintained without falling between the split nuts 1010 and 1020 and the tie bar 30 even by vibration.

In the present invention thus constructed, when assembling the half nut fastening mechanism, the half nut 1000 is positioned in the fastening state and the connecting block 6100 is assembled. At this time, the pressing body, that is, the elastic member 2010 is positioned in the cylinder 1022 of the connection block 6100 and the second split nut 1020. Subsequently, the length of the elastic member 2010, the compressive force, etc. are adjusted together with the gap G1 between the connecting block 6100 and the second split nut 1020 (example of adjustment; In the case of a spring, the elastic pressing force when the elastic member 2010 is compressed is adjusted so as to match the design clamping force. Therefore, even if there are some errors or deviations in the length of the connection block 6100 and the linkage device, it is possible to assemble in an accurate and complete state by the adjustment of the pressure body, as well as to uniformly match the forces of the half nuts on both sides. When the adjustment is made, the elastic member 2010 is kept in a slightly compressed state even in the normally released state, thereby preventing a rattling phenomenon when the link device is switched from one direction to the opposite direction.

As shown in FIG. 4, in a state in which the half nut 1000 is released from the tie bar 30, the connection block 6100 is backed by the pressing body, that is, the elastic pressing force of the elastic member 2010, and comes into contact with the stopper 6220. . At this time, the connection block 6100 and the second split nut 1020 maintain the interval of 'G1'.

As shown in FIG. 5, the drive source and the link device are operated in reverse for the fastening so that the connecting block 6100 moves toward the tie bar 30 (transfer operation), so that the two split nuts 1010 and 1020 are connected to the tie bar 30. And the pressing force for pressing the tie bar 30 is increased while the elastic member 2010 is compressed therefrom. At this time, the distance between the connection block 6100 and the second split nut 1020 is reduced to 'G2'.

6 and 7 illustrate a configuration of a half nut fastening mechanism according to another embodiment of the present invention, in which a half nut is released from a tie bar, and FIG. 7 is a cross-sectional view of FIG. 6. Is shown.

6 and 7, the configuration of the pressing body is different from the embodiment described above with reference to FIGS. 4 and 5 and the rest of the configuration is the same. Therefore, only a press body is demonstrated and it abbreviate | omits about the structure other than that.

6 and 7, the pressurized body according to the present embodiment is composed of a fluid 2020 that is filled in the cylinder 1022 by a fluid supply and pressurizes an end surface of the piston 6110.

Thus, the amount of fluid filled in the cylinder 1022 can be varied to absorb errors and deviations in the linkage during assembly.

In addition, after the split nuts 1010 and 1020 are engaged with the tie bars 30, increasing the fluid pressure of the cylinder 1022 can ensure the boosting operation, and the pressing force can be adjusted as necessary.

In order to configure the pressurized body with a fluid, as shown in the figure, a seal 6114 is disposed between the outer circumference of the piston 6110 and the inner circumference of the cylinder 1022 to block leakage of the fluid, and the cylinder 1022 or A fluid passage 1028 for supplying a fluid to the connection block 6100 (where a cylinder is formed in the connection block) is formed, and the fluid passage 1028 includes a fluid tube 1030 extending from a hydraulic source. I can connect it. The fluid hose 1040 is connected to the fluid pipe 1030.

When the cylinder 1022 is formed on the second split nut 1020, the sliding nut 100 is guided to slide so that the fluid pipe 1030 is transferred together with the transfer of the second split nut 1020. The through hole 22a is formed in the guide 22.

The foregoing is a description of certain preferred embodiments of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein, but may be modified and altered without departing from the spirit and scope of the invention as defined in the appended claims.

22: guide block
22a: through hole
30: tie bar
1000: Half Nut
1010: first half nut
1020: second half nut
1022: cylinder
1024, 6212: screw
1028 fluid passage
1030 fluid tube
1040: Fluid Hose
2010: Elastic member (pressing body)
2020 fluid (pressor)
6100: connecting block
6102: Guideman
6110: Piston
6200: Guides and Stoppers
6210: Guide shaft
6220: Stopper

Claims (7)

In the half nut fastening mechanism of the injection molding machine,
A half nut 1000 divided into first and second split nuts 1010 and 1020;
A connection block 6100 to which an end of the drive link device is connected;
A piston (6110) slidingly inserted into the cylinder (1022) formed in the second split nut (1020); And
And a pressurizing body interposed between the piston (6110) and the cylinder (1022) to pressurize the piston (6110) and the cylinder (1022) in a direction away from the injection molding machine. When the half nut 1000 is divided into the first and second split nuts 1010 and 1020, and the second split nut 1020 is moved by the linkage device, the first split nut 1010 interlocks in the opposite direction and the first split nut 1010 is moved. As a half nut fastening mechanism of an injection molding machine, the two split nuts (1010, 1020) to be engaged or released at the same time to the tie bar (30),
A cylinder 1022 formed on one of the connecting block 6100 and the second split nut 1020 which forms an end of the link device;
A piston (6110) formed at the other of the connection block (6100) and the second split nut (1020) facing each other and slidingly inserted into the cylinder (1022);
A pressurized body filled in the cylinder 1022 to press the end surface of the piston 6110 in the axial outward direction; And
The connecting block 6100 is mounted while maintaining the gap G1 with respect to the second split nut 1020, and allows the axial sliding movement of the second split nut 1020 within the gap G1. And a guide and a stopper 6200 for guiding and guiding the half nut fastening mechanism of the injection molding machine. The method according to claim 1 or 2,
The press body is a half nut fastening mechanism of the injection molding machine, characterized in that made of an elastic member for elastically pressing the end surface of the piston (6110). The method according to claim 1 or 2,
The press body is a half nut fastening mechanism of the injection molding machine, characterized in that the spring (2010) for elastically pressing the end surface of the piston (6110). The method according to claim 1 or 2,
The pressurizing body is a half nut fastening mechanism of an injection molding machine, characterized in that a plurality of plate springs are stacked. The method according to claim 1 or 2,
The pressurizing body is a half nut fastening mechanism of an injection molding machine, characterized in that the fluid (2020) is filled by the fluid supply source to the cylinder (1022) to apply pressure to the end face of the piston (6110). The method according to claim 6,
A seal 6114 is provided between the outer circumference of the piston 6110 and the inner circumference of the cylinder 1022 to block leakage of the fluid.
A fluid passageway 1028 for supplying or discharging fluid to the cylinder 1022 is formed,
And a fluid tube (1030) extending from the hydraulic source to the fluid passage (1028).

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