JPS6255943B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tie bar nut clamping device for inserting and removing a tie bar from a fixed platen in a molding apparatus such as a die casting machine or an injection molding machine.

As die casting machines become larger, it becomes necessary to pull out the tie bars (also called columns) that guide the movable platen that supports the mold on one side from the fixed platen in order to attach and detach the molds used there. The tie bar is tightened by a nut attached to a fixed plate. In large machines, it is difficult to tighten and loosen nuts, and for this reason a nut clamping device is incorporated which mechanically performs the above operations using a half nut. The known nut clamping device consists of a device for aligning the half nut with the threads of the tie bar and closing the nut, and a device for rotating and tightening the closed nut. Therefore, a drive source for opening and closing the nut and a drive source for rotating the nut are required, making the device itself complicated. Japanese Utility Model Application Publication No. 54-39414 discloses that one end of a half-split nut is mutually pivotally connected with a rotary plate, and the other end is rotated by a cylinder, so that the half-split nut is rotated by a single driving source. A tie bar nut clamping device is disclosed which is capable of performing opening/closing and tightening operations. This device also has a complicated structure because the nut is rotated and the nut and rotary plate must be sequentially engaged with a plurality of stoppers during rotation. Furthermore, since one end of the half nut is pivoted to each other and the other end is open, the amount of opening at the pivoted end is small.
There was a problem in that the opening stroke had to be large in order to reliably separate the half nut and tie bar when opened. In addition, in conventional tie bar nut clamp devices that tighten nuts by rotation, there is a detent that receives the tie bar against the rotation of the nut, and a movement that prevents the tie bar from moving in the axial direction as the nut rotates. This not only complicates the structure itself, but also requires the tie bar to have a groove for receiving the locking key, so There was a problem with parts becoming weak.

SUMMARY OF THE INVENTION An object of the present invention is to provide a tie bar nut clamping device that can reliably tighten or loosen a half nut on a tie bar with simple operations.

The tie bar nut clamping device according to the present invention is provided with a cam plate that is movable in a plane orthogonal to the joint surface of the half nut, and by driving this cam plate in the tie bar axial direction, the tie bar nut clamping device can clamp the half nut. A movable block is attached to the connecting member connected to the cam plate, and this movable block is configured to be crimped to the end face of the tie bar, and the opening/closing operation of the half nut and the crimping operation of the tie bar end face by the movable block are performed. This device is characterized in that it is driven by a single drive device.

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a schematic diagram of a die casting machine. 1 is a fixed plate, 2 is a movable plate, and 3 is an end platen (also called a fixed plate). The movable platen 2 is guided by a tie bar (column) 4 extending between the fixed platen 1 and the end platen 3, and is moved in the longitudinal direction by a driving means 5 attached to the end platen 3. 4a and 4b are nuts, 6 is an injection device, 7a is a mold attached to fixed plate 1, 7b
is a mold attached to the movable platen 2. The mold 7b is opened by the movement of the movable platen 2 to the left in FIG.
The mold is tightened by the movement to the right. If a large mold is to be removed or installed, the tie bars 4 will get in the way of the work. In such a case, by pulling out one or two tie bars 4, the mold attachment/detachment operation becomes easy. for that purpose,
Fixed plate 1 and tie bar 4 must be unfixed. The symbol 1 is used to fix the fixed platen 1 and tie bar 4.
This is done at the part indicated by 0.

FIG. 2 is a longitudinal sectional view of the fixing portion 10 of FIG. 1, and shows an embodiment of a tie bar nut clamping device to which the present invention is applied. 3 is a cross-sectional view taken along the line A--A in FIG. 2, FIG. 4 is a longitudinal sectional view taken along the line C--C in FIG. 3, and FIG.
This is a sectional view taken along line BB in the figure.

One end of a tie bar 4 passes through the fixed platen 1, and this end is threaded. Reference numeral 11 denotes a half-split nut, which is assembled into a single nut and can be screwed onto the thread of the tie bar 4 described above. As shown in FIG. 3, each half nut 11
has a flat side surface 11 in a direction perpendicular to the half-nut joint surface and parallel to the axis of the half-nut 11.
a is formed. In other words, half nut 11
A flat side surface 11a serving as a sliding guide surface is formed on the outer peripheral surface of both half nuts 11 parallel to the opening/closing direction of the tie bar 4 and the axial direction of the tie bar 4. Along this flat side surface 11a, a protrusion 11b is provided on the side surface 11a of both half nuts 11. Both upper and lower sides 1 of half-split nut 11
Cam plates 12 are disposed outside of 1a and in parallel therewith. Each cam plate 12
is in contact with substantially the entire width of both side surfaces 11a of both half nuts 11 on the same plane in the opening/closing direction. Two grooves 12a are formed on the half-nut side of each cam plate 12, and the protrusions 11b of the half-nut 11 are slidably inserted into these grooves 12a, and the grooves 12a and A concavo-convex guide portion is formed by the protrusion 11b. A plan view of this cam plate 12 is shown in FIG. The two grooves 12a are provided to widen toward the fixed platen 1 side, and therefore, the projections 11b of the half nut 11 that should be engaged with the grooves 12a are also arranged so that the fixed platen 1 side is further away from the nut joint surface. It is installed obliquely to the The cam plate 12 is slidably fitted into a cam plate guide 14 fixed to the half-nut storage box 13, and can move in the tie bar axial direction. The storage box 13 is attached to the fixed platen 1 with four bolts 15.

Two cam plates 12 are provided facing each other, and as shown in FIGS. 2 and 4, the pair of cam plates 12 are made of resilient steel and are connected by a pin hinge 12b at the right end in FIG. Connecting member 16
In this embodiment, the connecting member 16 is formed by two leaf spring members extending parallel to each other. This connecting member 16 is attached to the movable block 17 with bolts 18. In addition, connecting member 1
If elastic steel is used for 6, when the movable block 17 moves toward the fixed platen 1 with respect to the cam plate 12, the elastic steel will have to bend, so the elastic steel mounting surface of the movable block 17 will need to be bent. As shown in Figure 2, it is curved so that there is a slight gap on both sides. The movable block 17 has a rectangular cross section whose long sides are parallel to the cam plate 12 and perpendicular to the axis of the tie bar 4, and a side surface 17a along the short side is guided to the inner wall of the storage box 13. That is, as shown in FIG. 6, the inner wall 13a of the casing 13 is formed to protrude inward, and the inner wall 13a and the side surface 17a are provided with opposing grooves extending in the tie bar axial direction. The guide key 19 is inserted into the casing 13 in a fixed state. Therefore, the movable block 17 can move in the tie bar axial direction together with the connecting member 16 while sliding on the guide key 19. Further, as shown in FIG. 4, the position of the guide key 19 in the tie bar axial direction is adjusted by the adjusting screw 20, so that the end face of the guide key 19 on the fixed platen 1 side engages with the end face of the half nut 11. match. Therefore, the axial movement of the half nut 11 is restricted by the fixed platen 1 and the end face of the guide key 19, and the half nut 11 can be opened and closed in a direction perpendicular to the axial direction of the tie bar 4. End face of guide key 19 and half nut 11
After properly determining the gap, the guide key 19 is fixed with the set screw 21.

Furthermore, the fixed platen 1 at the center of the movable block 17
The side end surface 17b faces the end surface of the tie bar 4, and the end surface of the tie bar 4 and the end surface 17b of the movable block 17
For example, the distance b is 0.5 to 1 mm from the distance a between the end face of the cam plate 12 and the fixed plate 1,
set to be slightly larger.

Furthermore, the cam plate 12 and the movable block 1
7 drives are provided. 22 is a hydraulic cylinder, and a wedge-shaped member 24 is guided to the piston rod 23 of the hydraulic cylinder by the movable block 17 and the inner wall portion 13b of the storage box as shown in FIGS. 2 and 4. Therefore,
By advancing the wedge-shaped member 24 upward in FIG. 2, the movable block 17 and cam plate 12 can be driven to the left. This drive device is not limited to the mechanism shown in the figure, but the movable block 17
If it is a mechanism that drives the tie bar 4 in the axial direction, other mechanisms such as a mechanism that moves the movable block 17 by moving the screw shaft back and forth in the axial direction of the tie bar 4 using a motor or cylinder via a rack and pinion mechanism can also be applied. It is possible. In addition, when using the wedge-shaped member 24, it is preferable to use one having an inclination angle of about 11 degrees. In this case, even if an ordinary cylinder in which the area ratio of the chamber on the head end side and the chamber on the rod end side is approximately 1:0.7 is used, the wedge-shaped member 24 can be moved forward with less force than the force required to move the wedge-shaped member 24 forward.
You can pull it out by retreating. 25 is a stopper for positioning the tie bar 4 when it is inserted.

Next, the operation of the tie bar nut clamp device having the above structure will be explained.

When it becomes necessary to remove the tie bar 4 from the fixed platen 1 or fix it, the tie bar 4 can be moved in the axial direction by clamping the desired tie bar on the movable platen 2 and moving the movable platen 2 by the driving means 5. This is done by moving.

The state shown in FIGS. 2 to 4 shows a state in which the half nut 11 and the tie bar 4 are not engaged, and the nut is about to be tightened. The tie bar 4 is fed through the fixed platen 1 by the method described above, and when the end face of the tie bar 4 hits the positioning stopper 25, it is stopped at that position based on the signal from there, and the clamp with the movable platen is stopped. It will be canceled. This stopping position is predetermined at a position where the screw of the half nut 11 and the screw of the tie bar 4 match. Then cylinder 22
is actuated to drive wedge-shaped member 24 upwardly in FIG. As the wedge-shaped member 24 moves, the movable block 17 and the cam plate 12 move to the left, and the opposing half nuts 11 are closed by the cam action of the projection 11b and the groove 12a. Generally, the nut rotates at this point to complete screw tightening, but the feature of the present invention is that no rotation is involved.
That is, due to the difference between distances a and b, cam plate 1
2 comes into contact with the fixed platen 1 and the joining of the half nut 11 is completed, the end face 17b of the movable block 17
is close to the end face of the tie bar 4, and the distance at this time is, for example, about 1 mm. When the wedge-shaped member 24 is driven further, the movable block 17
and a connecting member 16 connecting the cam plate 12.
Due to the elasticity of the movable block 17, only the movable block 17 moves toward the end face of the tie bar 4, and finally presses against it, applying a force to push the tie bar 4 in the axial direction. Thereby, the screws of the tie bar 4 and the screws of the half nut are pressed together in the axial direction of the tie bar 4, resulting in a screw tightening effect. In this way, the installation of the nut is completed. After that, the mold 7a attached to the movable platen 2 is clamped and injection molding is performed. Further, the operation of loosening the half nut 11 is performed by the reverse procedure.

In the above configuration, the connecting member 16 is made of elastic steel, but the connecting member 16 does not necessarily have to be elastic, and the connection between the connecting member 16, the movable block 17, and the cam plate 12 can be By improving this, it is possible to obtain the same effect as the above configuration.

For example, instead of directly connecting the right end of the cam plate 12 in FIG. 2 and the connecting member 16 with the pin hinge 12b, a structure as shown in FIG. 7 may be used to connect the right end of the cam plate 12 in FIG.

In the one shown in FIG. 7, a non-resilient connecting member 16 is integrally attached to a movable block 17, and the connecting member 16 of the cam plate 12
A rod 26 is attached to the side by penetrating a part of the connecting member 16. 27 is a nut, and a relatively strong compression spring 28 is provided between the cam plate 12 and the connecting member 16.

In the state shown in FIG. 7, if the movable block 17 and the connecting member 16 move together to the left in the figure,
The cam plate 12 moves to the left via the compression spring 28, and once the cam plate 12 comes into contact with the fixed platen 1 and the joining of the half nut 11 is completed, the rest is as follows.
While the compression spring 28 is deflected by the forward movement of the connecting member 16, the movable block 17 is pressed against the end face of the tie bar 4, applying a force to push the tie bar 4 in the axial direction, thereby producing a screw tightening effect. In addition, when loosening the half nut 11, move the movable block 17 to the right in the figure, and operate the nut 27 to loosen the cam plate 12.
Do this by moving backwards.

As explained above, according to the present invention, the nut clamping function can be performed by a single drive device without turning the nut, and simple and reliable operation of complicated mechanical devices can be achieved. This effect is achieved. In particular, since both the cam plate and the movable block are driven in the same axial direction, the drive mechanism and its operation are simple, and compared to the prior art in which the nut is rotated, the present invention opens the nut in parallel. , the stroke for opening the nut can be made smaller.
Further, the nut can be held at a fixed position in the axial direction with respect to the fixed plate, and therefore the position of the tie bar that engages with this nut does not move in the axial direction, so there is no need for means for fixing the tie bar.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a die-casting machine to which the present invention is applied, Fig. 2 is an enlarged longitudinal sectional view of an embodiment of a tie bar nut clamping device to which the present invention is applied, and Fig. 3 is taken along line A-A in Fig. 2. 4 is a longitudinal sectional view taken along the line CC in FIG. 3, FIG. 5 is a plan view of the cam plate, FIG. 6 is an enlarged sectional view showing the guide of the movable block, FIG. 7 is a longitudinal sectional view showing another embodiment of a portion corresponding to FIG. 2. 1...Fixed plate, 2...Movable plate, 3...End platen, 4...Tie bar, 11...Half nut,
12...Cam plate, 13...Storage box, 14...
...Cam plate guide, 16...Connection member, 17
...Movable block, 22...Hydraulic cylinder, 2
4...Wedge-shaped member.

Claims (1)

[Claims] 1. In a tie bar nut clamping device that uses a half nut to tighten the tie bar onto a fixed platen or loosen it so that the tie bar can be pulled out from the fixed platen, a pair of half nuts are installed in a housing box fixed to the fixed platen. The half nut is provided movably in the half nut opening/closing direction perpendicular to the tie bar axis, and sliding guide surfaces are provided on the outer peripheral surfaces of both half nuts parallel to the half nut opening/closing direction and the tie bar axis direction, A cam plate that cooperates with the sliding guide surface of the half nut is provided in the half nut storage box so as to be movable in the tie bar axis direction, and a cam plate that extends toward the fixed plate is provided between both half nuts and the cam plate. A movable block is provided with an open concave and convex guide portion to enable the tie bar to be tightened to the tie bar nut.The movable block is movable in the tie bar axis direction and can be crimped onto the tie bar end face, and is movable when the movable block is away from the tie bar end face. The cam plate and movable block are arranged so that the distance between the end face of the block and the end face of the tie bar is greater than the distance between the end face of the cam plate and the fixed plate, and the distance between the cam plate and the movable block is made elastic. A single driving device is provided which connects the movable block with a connecting member including the members and drives the movable block in the tie bar axial direction, and the opening/closing action and tightening action of the half nut can be performed by the action of this single driving device. A tie bar nut clamp device with a configuration.