JPH0331520Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a device for balancing and supporting a slide of a press machine, and particularly relates to an improvement in the arrangement position of a balance cylinder.

[Background Art and its Problems] The slide of a press machine is connected to a driving crankshaft via a connecting rod, and is moved up and down by rotation of the crankshaft. There are multiple joints between the slide and the crankshaft, including a slide height adjustment mechanism provided on the connecting rod, and the weight of the slide creates clearance in one direction at these joints. . When the slide reaches the bottom dead center and press processing is performed, an upward press reaction force opposite to the slide weight direction acts on the slide and the clearance is moved to the opposite side, so a so-called breathing phenomenon occurs during this time. It ends up.

Conventionally, the piston rod of a balance cylinder using an air cylinder is connected to the slide, and the weight of the slide is balanced and supported by the air pressure of the balance cylinder, thereby preventing the occurrence of the breathing phenomenon due to the movement of the clearance.

Conventional balance cylinders are attached to the column or crown of a press machine, so the weight of the cylinder is applied to structures such as the column, which deforms the structure and adversely affects the smooth vertical movement of the slide due to displacement of the gib of the slide, for example. was. In addition, if the balance cylinder is installed on the crown, there is a problem in terms of cylinder safety because the balance cylinder is exposed to the outside, and if the press machine is installed on the factory floor with a crane, the balance cylinder may interfere with the crane operation. I was getting used to it.

[Purpose of the invention] The purpose of the invention is to prevent structures such as columns from deforming due to the weight of the balance cylinder, thereby preventing adverse effects on the smooth vertical movement of the slide, and to improve the balance. It is an object of the present invention to provide a slide balancer device for a press machine which is compact and prevents the cylinder from being exposed, which is effective in terms of the safety of the balance cylinder and the workability of crane operations.

[Means and effects for solving the problem] For this reason, the device according to the invention is a press machine in which a piston rod of a balance cylinder is connected to the slide, and the slide is balanced and supported by the air pressure of the balance cylinder, which moves up and down. In the slide balancer device, the balance cylinder is arranged at the bottom of the press machine housed in a pit inside the press machine installation floor, and a tank is connected to the balance cylinder and supplies air to the balance cylinder, It is attached via a bracket to the lower part of the rail of a moving truck which is laid on the floor where the press machine is installed and runs with the moving bolster of the press machine mounted thereon.

[Example] FIGS. 1 and 2 are a front view and a side view of a press machine to which a device according to this example is applied. This press machine is a three-column type in which three columns 3 are provided at the front and three at the rear for connecting the bed 1 and the crown 2, and there are two slides 4 on the left and right sides. These slides 4 are connected via connecting rods to a crankshaft disposed horizontally inside the crown 2, and are moved up and down for press working by rotation of the crankshaft.

An upper mold holder 5 for attaching an upper mold is fixed to the lower surface of the slide 4, and a lower mold that vertically opposes the upper mold is set on the upper surface of a bolster 6. 2 between the slide 4 and the bolster 6 as shown in FIG.
Parallel feed bars 7 are arranged, and these feed bars 7 perform approach and separation operations for clamping and unclamping the workpiece (movement in the left-right direction in Fig. 2), raising, lowering, forward movement, and backward movement (the first By performing the horizontal movement in the figure in synchronization with the vertical movement of the slide 4, the workpieces are automatically conveyed sequentially to a plurality of processing stages provided in the press machine. The bolster 6 is a moving bolster, and as shown in FIG. 2, rails 9 are provided at the front and rear of the press machine to allow a moving cart 8 of the moving bolster 6 to run.

As shown in FIG. 1, a vertical pit 11 is formed inside the floor 10 on which the press machine is installed, and a plurality of base columns 12 are erected in this pit 11.
As shown in FIG. 2, a plurality of lower girder members 13 are spanned between the lower girder members 13 and an upper girder member 14 that is orthogonal to the lower member 13 is spanned over the lower girder members 13. The bed 1 of the press machine is provided with a leg portion 15, and this leg portion 15 is installed and fixed to the upper girder member 14. As a result, the bottom part 16 of the press machine below the bolster 6 is housed in the pit 11 and installed on the upper girder member 14, and the lower girder member 13, the upper girder member 14, etc. become the base of the press machine. A balance cylinder 17 is attached to the bottom part 16, and the balance cylinder 17 is also housed in the pit 11 together with the bottom part 16. Although the balance cylinder 17 may be disposed inside the bed 1 forming the bottom portion 16, in this embodiment the balance cylinder 17 is attached to the underside of the bed 1.

FIG. 4 shows a specific mounting structure of the balance cylinder 17. A balance cylinder 17 is attached to a protruding portion 1A provided on the lower surface of the bed 1.
The piston rod 20 of the piston 19, which is fixed upward at 8 and is slidable in the cylinder, extends upward, and its tip is connected to the gib 21 of the slide 4.
is connected to. The piston rod 20 has a first rod 20A and a second rod 20B connected by a pin 22 to ensure the length up to the slide 4.
It consists of. A guide cylinder 23 is provided on the press machine structure such as the column 3, and the piston rod 2
0 is inserted into this guide tube 23, and the guide tube 23
The piston rod 20 is moved up and down while being guided by the piston rod 20.

As shown in FIG. 3, there are four gibs 21 on the front, rear, left and right sides of each slide 4, and the slide 4 is positioned and moved up and down by the sliding guidance action of these gibs 21 and the guide member 24 of the column 3.
A pinton rod 20 of a balance cylinder 17 is connected to each gib 21, so that there are four balance cylinders 17 for one slide 4.

As shown in FIGS. 1 and 2, a tank 26 is connected to each balance cylinder 17 via a pipe 25, and air is supplied to the balance cylinder 17 from this tank 26. The tank 26 is housed in the pit 11 in the same way as the balance cylinder 17, and the tank 26 is mounted and held on the rail 9 of the moving bolster carriage 8 via a bracket 27. The rail 9 is supported by the upper girder member 14 via a support 28, and the upper surface of the rail 9 is at the same height as the press machine installation floor 10. After the press machine is installed on the upper surface of the pit 11, a floor plate made of an iron plate or the like is provided on the same plane as the floor 10.

Since the piston rod 20 of the balance cylinder 17 is connected to the slide 4, the slide 4
The upward air pressure of the balance cylinder 17 is constantly applied to the slide 4, and the slide weight is balanced and supported by this air pressure when moving the slide 4 up and down for press working, which prevents the breathing phenomenon during press working. is prevented.

The balance cylinder 17 is located at the bottom 16 of the press machine.
The weight of the balance cylinder 17 does not act on the press machine structures such as the column 3 and the crown 2 located above the bottom 16. Therefore, the column 3 and the like are not deformed by the weight of the balance cylinder 17, and the slide 4 can smoothly move up and down. In addition, since the balance cylinder 17 is arranged in the pit 11, the press machine can be made more compact compared to the case where the balance cylinder is arranged protruding from the outside of the press machine, and the balance cylinder can be protected from external force. Safety can be ensured. moreover,
When the press machine is suspended by a crane using the bracket 29 provided on the crown 2 in order to install the press machine in a factory, the balance cylinder 17 is not placed on the crown 2, so that the crane work can be done easily. Become. Further, unlike the case where the balance cylinder is disposed on the crown 2, the piston rod 20 of the balance cylinder 17 supports the sliding weight by compressive force rather than pulling force, which is effective in preventing damage to the piston rod 20.

Furthermore, in this embodiment, the pit 11 is used as a space for arranging the tank 26, which is relatively large among the accessories of the press machine, and there is no need to provide space for the tank 26 in the press machine, so that the press machine can be made smaller. Furthermore, in storing the tank 26 in the pit 11, the rail 9 of the moving cart 8 of the moving bolster 6 is also used as a mounting member for the tank 26, so special members are prepared for mounting the tank. There is no need to do this, and the tank mounting structure can be simplified.

Although the press machine in the above embodiment was of the type having two slides 4, the device according to the present invention can of course be applied to a press machine having one slide. Further, in this embodiment, both the balance cylinder and the tank are housed in the pit, but only the balance cylinder may be housed. However, if you also store the tank, you can obtain the aforementioned effect.

[Effects of the invention] According to the invention, since the weight of the balance cylinder does not act on structures such as columns, deformation of the structure can be prevented, and therefore, there is no adverse effect on the smooth vertical movement of the slide. In addition, since the balance cylinder is not exposed, it is beneficial in terms of safety of the balance cylinder and workability in crane work, etc. Furthermore, since the tank is provided at the bottom of the rail of the moving truck, the entire press machine becomes compact.

[Brief explanation of the drawing]

FIG. 1 is a front view of the press machine, FIG. 2 is a side view thereof, FIG. 3 is a plan view of the vicinity of the slide, and FIG. 4 is a longitudinal sectional view showing the mounting structure of the balance cylinder. 4...Slide, 6...Bolster, 8...Moving bolster transportation trolley, 9...Rail, 10
...Press machine installation floor, 11...Pits, 16...
...bottom, 17...balance cylinder, 20...piston rod, 26...tank.

Claims (1)

[Scope of utility model registration request] In a slide balancer device for a press machine in which a piston rod of a balance cylinder is connected to a slide and a vertically moving slide is balanced and supported by the air pressure of the balance cylinder, the balance cylinder is housed in a pit inside the press machine installation floor. A tank placed at the bottom of the machine, connected to the balance cylinder, and supplying air to the balance cylinder is installed on the rails of a moving truck that is laid on the press machine installation floor and runs on which the moving bolster of the press machine is mounted. A slide balancer device for a press machine, characterized in that it is attached to the bottom of the press machine via a bracket.