JPS6313238Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to a driving device for a walking beam heating furnace, and more particularly, to an improvement of an electric driving device for a walking beam. In a walking beam heating furnace, for example, the first
As shown in the figure, a fixed beam 2 is installed inside the heating furnace 1, and a walking beam 3 (A→B→C→ (D→A, rectangular motion)
A truck 4 provided at the bottom of the walking beam 3, a cylinder 5 for moving the truck 4 forward and backward, and a cylinder 5 located at a lower level than the truck 4.
It has an eccentric wheel 6 that moves up and down, and moves the object 7 to be heated, such as a piece of steel, forward (from B to C). Note that 8 indicates the upper surface level (also referred to as a pass line) of the fixed beam 2. As shown in an enlarged view in FIG. 2, the eccentric wheel 6 includes a shaft 61 that is rotationally driven by an electric motor (not shown), an eccentric plate 62, and a bearing 63.
It consists of an outer ring 64 and the like. Note that s ₁ indicates the amount of eccentricity between the shaft 61 and the eccentric plate 62. Therefore, when the shaft 61 is rotated, the carriage 4 moves by 2s ₁ .
begins to rise and fall. The conventional method of driving the walking beam 3 of the heating furnace 1 is as follows:
and from C to D, as shown by the horizontal arrow v ₁ , and from B to C, and from D to A, as shown by the vertical arrow v ₂ . In other words, the speed V ₁ is maximum at the center point (pass line 8) of the stroke of the walking beam 3 when it ascends (A→B) and descends (C→D), and when it ascends (A→B) At the center point, the heated object 7 is transferred from the fixed beam 2 to the walking beam 3 (the walking beam 3 receives the heated object 7).
The object to be heated 7 is transferred from the walking beam 3 to the fixed beam 2 at the center point during the descent (from C to D) (the walking beam 3 passes the object to be heated 7 to the fixed beam 2). ing. Therefore, the fact that the speed v ₁ is the maximum during these transfers has the following disadvantages. In other words, a large shock is applied to the fixed beam 2 and the walking beam 3, causing vibration, which in turn causes the object to be heated 7 to shift laterally during transfer, which is one of the causes of the object to be heated 7 falling off the beam. Heat-resistant steel blocks (skid buttons, rails, riders, etc.) are provided on the upper surfaces of the fixed beam 2 and the walking beam 3 to directly receive the heated object 7, but since the blocks are large, they wear out quickly. In order to eliminate the above-mentioned drawbacks, it has been proposed that the walking beam 3 be decelerated near the aforementioned center point so that the walking beam 3 passes at a low speed. However, while intermediate reduction can be easily achieved with hydraulic systems, with electric systems the motor rotation speed control device is expensive.
There are no examples of this being implemented in reality. SUMMARY OF THE INVENTION The object of the present invention is to provide a walking beam drive device that is relatively inexpensive, reliable, and mechanically capable of achieving zero intermediate speed, which is better than the intermediate deceleration method. For this reason, the configuration of the present invention includes a dolly provided at the bottom of the walking beam that allows the walking beam to move up and down and back and forth in a rectangular motion, and a dolly located below this dolly that is rotated at a constant rate by an electric motor. In the walking beam type heating furnace, the cam has a cam that moves the cart up and down at the time when the walking beam transfers the object to be heated between the upper surface of the fixed beam and the upper surface of the fixed beam. A cam roller having a heart-shaped cam surface whose speed is zero even at a constant rotational speed of the camshaft, and which is rotatably provided in contact with the cam surface at the upper part of the cam. , a trolley roller rotatably provided to support the trolley at the lower part of the trolley, one end of which is supported by a fulcrum shaft, the cam roller and the trolley roller are attached, and the roller swings in the vertical direction. It is characterized by being equipped with a lever that can be installed. Hereinafter, embodiments of the present invention will be described with reference to FIGS. 4 to 8. 4 to 6 show a first embodiment of the invention, and FIGS. 7 and 8 show a second embodiment of the invention. The walking beam type heating furnace implementing the present invention has a heating furnace main body, a fixed beam, a walking beam, and a cart that allows the walking beam to move up and down and back and forth in a rectangular motion, as shown in the conventional one shown in Figure 1. Since there is no difference in concept from the above, FIGS. 4 to 8 show the lower part from the cart. In Figures 4 and 5, 11 is a cam;
As will be described later, the heart-shaped cam surface 12 (cam outer circumferential surface )have. A cam roller 13 is provided above the cam 11 so as to be rotatable in contact with the cam surface 12. Reference numeral 14 denotes a truck roller, which is rotatably provided to support the truck 4 by contacting the lower surface of a rail 15 attached to the lower part of the truck 4. 1
A lever 6 is supported at one end by a fulcrum shaft 17, has a cam roller 13 and a truck roller 14 attached thereto, and is provided so as to be swingable in the vertical direction about the fulcrum shaft 17. As seen in FIG. 4, in this embodiment, the truck roller 14 is provided at the center between the cam roller 13 and the fulcrum shaft 17. FIG. 6 is an enlarged view of the cam 11, 18 is the cam shaft,
Reference numeral 19 is a reference circle having a radius r centered on the center of the camshaft 18, and 20 is a vertical line passing through the center of the camshaft 18. Further, S is the cam stroke necessary for the cam, and in this embodiment, it is twice the vertical stroke required for the walking beam. θ is an arbitrary angle measured with reference to 0° of the vertical line 20,
R is the length from the center of the camshaft 18 to the cam surface 12 at the angle θ. The relationship between the angle θ and the length R of the cam 11 shown in FIG. 6 is as shown in Table 1.

[Table] In the walking beam drive device configured as explained in FIGS. 4 to 6, when the camshaft 18 is rotated from an electric motor (not shown) via a reduction gear, the cam 11 is rotated in that direction. The cam roller 13 moves up and down along the cam surface 12 while rotating. This cam roller 13
As a result of the upward and downward movement of the lever 16, the lever 16 swings vertically about the fulcrum shaft 17,
Since the cart roller 14 provided at the center of the cart 6 moves up and down, the cart 4 makes the same up and down movement as the cart roller 14. Therefore, the walking beam is connected to the truck roller 1 via the truck 4 and the rail 15.
4, the walking beam moves up and down in the same way as the up and down movement of the cart 4. Here, the 0° position of the cam 11 in Figure 6 is the lowest point of the walking beam (A and D in Figures 1 and 3), and the 180° position of the cam 11 is the lowest point of the walking beam. These are the highest points (B and C in Figures 1 and 3). Also, the positions of the angles α and α' of the cam 11 are the center points of the vertical stroke of the walking beam, and at these points α and α', the upper surface position of the walking beam and the upper surface position of the fixed beam are at the same level (Fig. 1 and In FIG. 3, this is the pass line 8), and the object to be heated is transferred thereto. As mentioned above, at the angles α and α′ of the cam 11, R
= r+S/2, so that the upper surface level of both beams is the same at α and α'. Furthermore, the shape of the cam surface 12 of the cam 11 is such that the cam surface at the positions α and α' The tangent line 21 of 12 is perpendicular to the line of action 22 passing through the center of the camshaft 18,
In other words, at the positions α and α′,
Since dR/dθ is set to 0, there is no change in R at the points α and α′. Therefore, the vertical movement speed of the cam roller 13 becomes zero, and the vertical movement of the trolley 4 stops, that is, walking The vertical velocity of the beam becomes zero. By doing so, it is possible to eliminate a large shock when the walking beam transfers the object to be heated between it and the upper surface of the fixed beam. Further, in the embodiment shown in FIG. 4, the load from the truck 4 acts on the truck roller 14, but since it is divided into two between the fulcrum shaft 17 and the cam roller 13, the load applied to the cam 11 is halved, and the load applied to the cam 11 is halved. 11 can be significantly extended. The angles α and α′ are also shown in Table 1 above, but
Appropriate angles are 60°≦α≦90° and 270°≦α′≦300°.If the angle is less than 60° or exceeds 300°, it will be difficult to work the cam 11. In addition, if the rotation angle θ of the cam 11 after placing the object to be heated is between more than 90 degrees and less than 270 degrees,
is smaller, the required torque becomes larger and excessive equipment is required. The second embodiment shown in FIGS. 7 and 8 is not much different from the first embodiment shown in FIGS. 4 and 5 in terms of its structure and operation.
Identical or equivalent parts are given the same reference numerals. That is, the second embodiment differs from the first embodiment in that the cam roller 13 and the trolley roller 14 are attached to the lever 16 using the same shaft and are attached via bearings, respectively. , the load from the truck 4 is not halved and is applied to the cam 11 as it is, but the cam 11
Since the size of the cam stroke required for this is equal to the vertical stroke required for the walking beam, the shape of the cam surface 12 of the cam 11 of the second embodiment is geometrically similar to that of the cam 11 of the first embodiment. This means that the dimensions can be halved, making it more compact. As described above, the present invention includes a cam that is rotated by an electric motor at a constant rate to cause the walking beam cart to move up and down, and the cam includes a cam that allows the walking beam to move the object to be heated to the upper surface of the fixed beam. Since it has a heart-shaped cam surface that allows the vertical movement speed of the walking beam to be zero even at a constant rotation speed of the camshaft at the time of transfer between
When the walking beam transfers the object to be heated, the vertical movement speed of the walking beam becomes zero, so a speed control device for the electric motor is not necessary, or a very simple device that rotates at a constant speed may be sufficient. Moreover, there is no need to give a large shock to the fixed beam and walking beam when transferring the heated object, no vibration occurs, and the falling of the heated object is reliably prevented. The effects of the present invention are extremely large, such as significantly reducing wear and tear on the heat-resistant steel blocks.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional side view showing an overview of a conventional walking beam heating furnace, Figure 2 is an enlarged cross-sectional side view of the eccentric wheel in Figure 1, and Figure 3 is a velocity diagram of the walking beam in Figure 1. , FIG. 4 is a side view showing the first embodiment of the present invention, FIG. 5 is a front view seen from the cam side of FIG. 4, and FIG. 6 is an enlarged side view of the cam of FIG. 4. , FIG. 7 is a side view showing a second embodiment of the present invention, and FIG. 8 is a front view seen from the cam side of FIG. 7. 1...Heating furnace, 2...Fixed beam, 3...Walking beam, 4...Dolly, 11...Cam, 1
2...Cam surface, 13...Cam roller, 14...Dolly roller, 15...Rail, 16...Lever, 1
7...Fully shaft.

Claims (1)

[Scope of utility model registration request] A cart provided at the bottom of the walking beam to cause the walking beam to move up and down and in rectangular motion; and a cam located below the cart and rotated by an electric motor at a constant rate to cause the cart to move up and down. In the walking beam heating furnace, the cam has a structure in which the vertical movement speed of the walking beam is at a constant rotational speed of the cam shaft at the time when the walking beam transfers the object to be heated between it and the upper surface of the fixed beam. It has a heart-shaped cam surface that makes it zero.
and a cam roller rotatably provided in contact with the cam surface at the upper part of the cam, and a cart roller rotatably provided in the lower part of the cart to support the cart, and one end is 1. A driving device for a walking beam heating furnace, comprising a lever that is supported by a fulcrum shaft, has the cam roller and truck roller attached thereto, and is swingable in the vertical direction.