JPH037385Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention relates to a driving device for a walking beam type heating furnace. Specifically, the invention relates to a driving device for a walking beam type heating furnace. Among the drive devices for making rectangular motion in forward and backward motion, this is used as a drive device for raising and lowering a walking beam truck.

BACKGROUND ART A conventional walking beam type heating furnace, for example, as shown in FIG. A walking beam 13 that can move in the forward direction (moves in a rectangular direction from A to B to C to D to A), and this walking beam 13
Walking beam trolley 14 installed at the bottom of
and a cylinder 15 that moves this truck 14 forward and backward.
, and the trolley 14 is located lower than the trolley 14.
It consists of an elevating drive device, which will be described later, which causes the elevating motion of the elevating device. And, the elevating drive device is
A rotary cam 16 that causes the truck 14 to move up and down, a cam roller 17 rotatably provided in contact with the cam surface of the cam 16 at the upper part of the cam 16, and a cam roller 17 that supports the truck 14 at the lower part of the truck 14. A cart roller 18 is rotatably provided, and one end is connected to the fulcrum shaft 1.
9 and the cam roller 17
and a lever 20 to which a trolley roller 18 is attached and which is swingable in the vertical direction. The material 21 to be heated, such as a steel piece, advances to the right in FIG. 2 in the heating furnace 11 while alternately moving on the fixed beam 12 and the walking beam 13.

Problems to be Solved by the Invention As mentioned above, in the conventional elevating drive device for the walking beam cart 14, the control of the elevating speed of the cart 14 is based on the shape of the cam surface of the rotation cam 16 and the shape of the cam surface of the cam 16. Although it is ideally operated at a rotational speed, the cam surface of the cam 16 supports the load of the trolley 14, and the load is limited in terms of surface pressure. The problem is that it is large in size and is not suitable for heavy load conditions. In addition to the cam type shown in Fig. 2, a hydraulic tilting truck type is also known as a lifting drive device, but this requires two stages of trucks, upper and lower, and the device is complicated. Since it is not possible to ideally control the lifting speed in terms of hydraulic control, in other words, it is not possible to respond to changes when the load is transferred, the shot load is used to move the heated material There is a problem in that it causes an increase in meandering. The present invention attempts to solve these problems. That is,
This invention can downsize the rotating cam,
It is now possible to downsize the lifting drive device, and as a result, the number of lifting drive devices installed in the space below a certain walking beam truck can be increased, and the supporting load of the truck can be increased. It is an object of the present invention to provide a driving device for a walking beam heating furnace, which can easily increase the size of the walking beam heating furnace.

Means for solving the problem A hydraulic cylinder was provided in parallel with the rotating cam to raise and lower the walking beam truck. That is, the configuration of the present invention includes a walking beam cart that is provided at the bottom of the walking beam and causes the walking beam to move up and down and back and forth in a rectangular motion, and a walking beam cart that is provided below this cart to take part of the load from the cart. a rotating cam that supports the trolley and causes the trolley to move up and down; a cam roller that is rotatably provided in contact with the cam surface of the cam at the upper part of the cam;
A cart roller is rotatably provided at the bottom of the cart to support the cart, and one end is supported by a fulcrum shaft, and the cam roller and the cart roller are attached to the cart roller so as to be swingable in the vertical direction. a lever; and a hydraulic cylinder that is located near directly below the truck roller, supports most of the load from the truck, and works with the rotary cam to cause the lever to swing in the vertical direction. It is characterized by

Function Since the rotating cam bears part of the load from the walking beam truck, and the hydraulic cylinder bears most of the load from the truck, the rotating cam can be made smaller and the hydraulic pressure Although the cylinder is small, it is possible to obtain a large output, and by combining the output of the hydraulic cylinder with ideal cam-type lifting control, it is possible to appropriately perform the lifting movement of a large heating furnace with a large load.

Embodiment FIG. 1 shows an embodiment of the present invention. 1st
In the figure, reference numeral 1 denotes a walking beam truck which is installed at the lower part of a walking beam (not shown) and causes the beam to move up and down and back and forth in a rectangular motion;
2 is a rotary cam provided below the truck 1 to support part of the load from the truck 1 and causes the truck 1 to move up and down; 3 is an upper part of the cam 2;
a cam roller rotatably provided in contact with the cam surface of the cart; 4 a cart roller rotatably provided supporting the cart 1 at the lower part of the cart 1; 5 a fulcrum shaft;
Reference numeral 6 denotes a lever whose one end is supported by the fulcrum shaft 5 and is rotatably attached to the cam roller 3 and the truck roller 4 so as to be swingable in the vertical direction; 7 is located near the right below the truck roller 4; A hydraulic cylinder 8 is positioned to support most of the load from the truck 1 and cooperate with the rotary cam 2 to cause the lever 6 to swing in the vertical direction. A hydraulic cylinder 8 connects the lever 6 and the hydraulic cylinder 7. This is the connecting pin that serves as the node of the link mechanism.

In the elevating drive device for a walking beam heating furnace configured as shown in FIG. 1, making the walking beam cart 1 perform a predetermined elevating motion is similar to the elevating drive device shown in FIG. 2. However, since the rotating cam 2 and the hydraulic cylinder 7 are provided in parallel, the hydraulic cylinder 7 is operated to disperse the force applied to the cam 2 from the walking beam truck 1 and reduce the force received by the cam 2. I'm doing less. That is, about 70% of the torque required when the walking beam cart 1 moves up and down is applied to the hydraulic cylinder 7 connected to the lower part of the lever 6 based on the weight change command from a computer (not shown) every moment. Approximately 30% of the remaining load condition is applied as an output, and the rotational force of the rotating cam 2 is used to move the cart 1 up and down. Therefore, since the rotary cam only has to bear about 30% of the load condition, it can be made smaller accordingly.

In the embodiment shown in FIG. 1, the hydraulic cylinder 7 is shown as the hydraulic cylinder, but the same applies to hydraulic cylinders other than hydraulic cylinders.

Effects of the invention The present invention combines a rotary cam and a hydraulic cylinder as an elevating device for a walking beam truck, and applies the back-up force of the hydraulic cylinder to the truck, and the cylinder carries most of the load. Since the cam supports part of the load, the cam can be made smaller, and since the hydraulic cylinder is located directly below the truck roller, it can be attached to the walking beam truck. It becomes possible to perform stable ascending and descending movements. This makes it possible to downsize the elevating drive device, increase the number of elevating drive devices installed in the space below a given walking beam truck, and increase the supporting load of the cart. Therefore, by increasing the number of support points, it is possible to increase the size of the walking beam truck within a certain range, and it becomes easy to increase the size of the walking beam type heating furnace. Furthermore, by combining the output of the hydraulic cylinder with ideal cam-type lifting control, it is possible to appropriately move the walking beam carriage of a large heating furnace with a large load up and down.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view showing an embodiment of the present invention, and FIG. 2 is a cross-sectional side view showing an example of a conventional walking beam heating furnace. 1... Walking beam trolley, 2... Rotating cam, 3... Cam roller, 4... Dolly roller, 5...
...Fulcrum shaft, 6...Lever, 7...Hydraulic cylinder,
8... Connection pin.

Claims (1)

[Scope of utility model registration request] A walking beam cart is provided at the bottom of the walking beam and causes the walking beam to move up and down and forward and backward in a rectangular motion. A rotating cam that moves up and down; a cam roller that is rotatably provided in contact with the cam surface of the cam at the top of the cam; and a cart roller that is rotatably provided to support the cart at the bottom of the cart. a lever that is supported at one end by a fulcrum shaft and is swingable in the vertical direction by attaching the cam roller and the truck roller; 1. A driving device for a walking beam heating furnace, comprising: a hydraulic cylinder that supports most of the lever and cooperates with the rotary cam to cause the lever to swing in the vertical direction.