JP6911233B2 - Balancer - Google Patents

Description

The present invention relates to a balancer used to relax the inertial force of a heavy member such as a slider in a press device.

Press devices that move the slide up and down by converting the rotational force of a drive device such as a motor into up and down reciprocating force by a crankshaft, eccentric shaft, gears, etc. are widely used in the manufacturing industry. In such a press device, the direction of acceleration changes by 180 degrees at the ascending and descending limits of the slide, so a large inertial force due to the mass of the slide applies an impact force in the vertical direction to the press device, causing vibration of the press device. Not only is it inviting, but it also puts a heavy load on the drive unit. Various balancers have been conventionally devised in order to reduce such inertial force. In addition to press devices, balancers are also used in industrial devices that drive heavy-duty members.

For example, in Patent Document 1, in a servo press in which a slide is driven via a screw mechanism using a servomotor as a drive source, a collaborative member that cooperates with a slide that moves up and down and an elevating motion transmitted by the collaborative member. A dynamic balancer device for a servo press has been proposed, which comprises a phase reversing means for reversing the phase of the servo press and a balance weight driven by an ascending / descending motion transmitted by the phase reversing means. In this device, two balance cylinders are provided on the lower surface of the crown. The rod of the balance cylinder is fixed to the slide. In this balance cylinder, the slide is lifted by filling the space on the slide side of the space partitioned by the piston provided in the balance cylinder with air pressure, and the slide and mold (upper mold) are screwed and driven. The load on the mechanism is reduced.

Further, in Patent Document 2, a servomotor is provided in the balancer, a hanging member is connected to the slide, and the rotation of the servomotor is converted into a vertical movement of the hanging member by a ball screw (conversion mechanism). A crank-type forging press device is disclosed in which a slide is lifted and lowered while the slide is suspended by a balancer to perform forging work.

JP-A-2002-192396 Japanese Unexamined Patent Publication No. 2014-39942

In the technique of Patent Document 1, two air cylinders are used as the balance cylinders, but since they are installed on both sides of the press device, there is one on one side. Further, also in the press apparatus of Patent Document 2, judging from the figure, one balancer is arranged on each side.

In any of the above techniques, one balancer is arranged on each side, but a large cylinder pressure is required to reduce the inertial force of a slide with a large mass, and the cylinder itself becomes large when trying to increase the stroke. There was a problem that it turned into a cylinder. In view of the above problems, it is an object of the present invention to provide a small balancer that can be used in an industrial device such as a press device and has sufficient performance.

In order to solve the above problems, the balancer according to the present invention is used in an industrial device for driving a heavy member such as a press device for driving a slide by converting a rotary motion of a drive source into a reciprocating motion of up and down. In a balancer that relieves inertial force, a plurality of fixed or vertically movable stages are provided in the vertical direction, and the fluid cylinders are connected in series by providing fluid cylinders on each stage. do.

It is preferable that the plurality of fluid cylinders are connected in series in two or three stages. It is preferable that the fluid cylinder is filled with nitrogen gas.

In the balancer according to the present invention is provided with a fixed or a plurality of stages that can move up and down in the vertical direction, it is possible to place the fluid cylinder on each stage, only it is possible to shorten the stroke of individual cylinders or can be employed a commercially available small cylinder and that Do. Therefore, it is possible not only to contribute to the miniaturization and price reduction of the press device, but also to retrofit the existing press device .

Hereinafter, the balancer according to the present invention will be described based on Examples.

FIG. 1 shows an example of a balancer unit for a press device according to the present invention. In this embodiment, the nitrogen gas cylinders are arranged in two upper and lower stages. The first cylinder 11 is installed on the first stage 21, and the second cylinder 12 is installed on the second stage 22 arranged in contact with the tip of the first cylinder 11. A top stage 23 is provided on the second cylinder 12. The first stage 21, the second stage 22, and the top stage 23 are connected to each other by four guide shafts 30, and the second stage 22 and the top stage 23 are further configured to be slidable up and down along the guide shaft 30. Has been done. A stop block 40 is arranged on two opposite sides of the first stage 21 and the second stage 22.

FIG. 2 shows the operating state of the balancer unit shown in FIG. (A) is the extended state, both the first cylinder 11 and the second cylinder 12 are in the extended state, and the top stage 23 is located at the upper end of the guide shaft 30. (B) shows the state when the cylinder is contracted. When a load is applied to the top stage 23, both the first cylinder 11 and the second cylinder 12 contract, and the top stage 23 and the second stage 22 slide downward along the guide shaft 30 accordingly. Since the stop block 40 is arranged in the first stage 21 and the second stage 22, the top stage 23 and the second stage 22 do not slide below the position of the stop block 40, and the first cylinder 11 and the first cylinder 11 and the second stage 22 do not slide below the position of the stop block 40. The second cylinder 12 is protected.

By connecting the balancer unit as described above to the four corners of the slide of the press device, for example, the inertial force in the lowering limit during the slide operation can be relaxed.

FIG. 3 shows another embodiment of the balancer unit for the press device according to the present invention. It is also possible to adjust the pressure of the balancer cylinder by connecting the compression tank 50 through the connecting pipe 51 for each cylinder.

In the above embodiment, the nitrogen gas cylinder has been described. In the case of a nitrogen gas cylinder, a high pressure (100 to 200 kg / cm ² ) is possible, so a compact cylinder with a high repulsive force can be realized. However, it is of course possible to use other gases such as air and liquids such as flood control. Further, the number of cylinders connected in series is preferably 2 to 3 in consideration of cost, ease of manufacture, and the like. The number of balancer units used is not limited to four, and it is of course possible to change the number as needed. As these cylinders, it is possible to use commercially available cylinders because the load on each cylinder is reduced by using a plurality of these cylinders in series. Therefore, it can be manufactured at an extremely low cost as compared with the case of using a custom-made cylinder. Further, in the above embodiment, the press device has been described as an example, but it goes without saying that the press device can also be used in other industrial devices for driving heavy members.

In the balancer according to the present invention is provided with a fixed or a plurality of stages that can move up and down in the vertical direction, it is possible to place the fluid cylinder on each stage, only it is possible to shorten the stroke of individual cylinders or can be employed a commercially available small cylinder and that Do. Therefore, it is possible not only to contribute to the miniaturization and price reduction of the press device, but also to retrofit the existing press device . The balancer according to the present invention is extremely useful in industrial equipment.

It is a perspective view which shows the balancer by this invention. It is a front view of the balancer by this invention, (a) shows the state at the time of extension, (b) shows the state at the time of compression. Another embodiment of the balancer cylinder according to the present invention is shown.

11 1st cylinder 12 2nd cylinder 21 1st stage 22 2nd stage 23 Top stage 30 Guide shaft 40 Stop block 50 Compression tank 51 Connection pipe

Claims (2)

Fixed or movable up and down in a balancer used to relieve the inertial force of heavy members, such as the slide of a press device that converts the rotational motion of the drive source into a reciprocating motion of up and down to drive the slide. A balancer characterized in that a plurality of stages are provided in the vertical direction and the fluid cylinders are provided on each stage to connect the fluid cylinders in series. The balancer according to claim 1, wherein a plurality of fluid cylinders are connected in series in two or three stages in the unit.

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