JP2000335723A - Movable beam lift for walking beam type carrier device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a movable beam lift possible of drive with small power, lighter in weight and inexpensive manufacturing cost for a walking beam type carrier device in a heating furnace. SOLUTION: A movable beam lift 4 for a walking beam type carrier device lifts a movable beam 2 while latching at least two levers to a connecting rod 16 reciprocating in a walking beam carrier device 1 for a heating furnace. Each of the levers formed into a hooked lever 9 has a bent portion pivotally mounted on bearings 13a, 13b fixed to a foundation concrete and the end pivotally mounted on the side of the connecting rod 16 on the lower part of a T-shaped bearing 6, the T-shaped bearing 6 being pivotally mounted at its upper part on two lift rollers 5a, 5b, the lift rollers 5a, 5b being put in contact with respective shift rails 3 fixed to the lower face of the movable beam 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a walking beam type transfer apparatus for a heating furnace, and more particularly to a movable beam lifting and lowering apparatus for the apparatus.

[0002]

2. Description of the Related Art A walking beam type transfer apparatus for a metal material heating furnace is provided between a plurality of fixed skids provided in parallel.
This device is provided with a movable beam that can be raised, lowered, and advanced, and transports an object loaded on the fixed skid on the fixed skid by the rectangular motion of the movable beam.

FIGS. 6 (a) to 6 (e) are conceptual illustrations of the principle of transport of a movable beam by a rectangular movement. The left side of FIG. 6 (a) shows the relative positional relationship between a fixed skid 23 and the movable beam 2. As shown, the movable beam 2 is located between and below the fixed skids 23, and a moving object 42 is mounted on the upper surface of the fixed skids 23.

After the moving object 42 is lifted by the rising of the movable beam 2 as shown in FIG. 6B, the raised movable beam 2 is moved by the piston of the shift cylinder 41 as shown in FIG. The movable beam 2 is advanced by the extension of the rod, and then advanced as shown in FIG.
Is moved down to the upper surface on the front side of the fixed skid 23 to be settled. Thereafter, as shown in FIG. 3E, the movable beam 2 retreats to the original position due to the contraction of the piston rod of the shift cylinder 41, and the movable beam 2 returns to the initial position before the ascending.

Accordingly, the moving object 42 moves forward each time the movable beam 2 repeats a series of movements, that is, a rectangular movement. Note that the two-dot chain line in FIG. 6B shows the position of the movable beam 2 in FIG. 6A before the movable beam 2 rises, and the two-dot chain line in FIG. Before moving, the position of the movable beam 2 in FIG. 3C is shown, and the arrows on the left side of FIGS.

As a method of elevating and lowering the movable beam, a method of raising and lowering a lower end of a column on a tapered surface as disclosed in Japanese Utility Model Laid-Open No. 63-56247 has been known.
A method of rotating an eccentric cam as disclosed in JP-A-4-235815, or JP-A-55-995.
There is a method of turning the tip of a lever as disclosed in Japanese Patent Publication No. 76-76. However, these methods require extremely large power, so that the equipment is heavy and expensive. Therefore, development of a device capable of raising and lowering the movable beam with small power has been awaited among concerned parties.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the conventional method and to provide a movable beam lifting / lowering apparatus which can be driven with small power.

The present invention has the following features in order to achieve the above object. That is, the two lift rollers 5a, which contact the shift rail 3 fixed to the lower surface of the movable beam 2,
5 b is provided above the T-shaped bearing 6, and at least two or more devices are provided on the movable beam 2 by pivoting the lower part of the T-shaped bearing 6 with the vicinity of the tip of a hook-shaped lever 9. A movable beam lifting / lowering device 4 characterized in that the movable beam 2 is raised / lowered synchronously by simultaneously swinging the lower end of the lever 9 in the same direction, is provided in the walking beam type transport device.

The movable beam elevating device of the present invention (hereinafter simply referred to as the elevating device) has been completed based on the fact that the inventors have learned the efficient principle of raising and lowering the movable beam with small power. . Although the principle is very simple, nobody has noticed the principle so far, so that the movable beam is raised and lowered by the heavy apparatus as described above.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in FIGS. As shown in FIG. 1, the lifting device 4 of the present invention pivots with a pair of bearings 13 a and 13 b provided on the upper surfaces of foundation concretes 19 a and 19 b protruding from the floor 22 with the bent portion of the hook-shaped lever 9 to form a hook-like shape. A hole 15 provided near the lower end of the lever 9 is pivoted on a pin 14 provided on a connecting rod 16 reciprocated by a lift cylinder 17, and the upper end of the hook-shaped lever 9 and the lower end of the T-shaped bearing 6 are pivoted on the pin 8. Then T
At the upper end of the U-shaped bearing 6, two lift rollers (5
a, 5b).

The end of the lift cylinder 17 is pivotally connected to a bracket 18 provided on the side of the foundation concrete 21 protruding from the floor 22, and the connecting rod 16 is attached to the lift roller 5.
T-shaped bearing 6 provided with a, 5b and a hook-shaped lever 9 pivoted
Are engaged in at least two places. Here, the lift rollers 5a and 5b are flanged rollers, which come into contact with the shift rail 3 fixed to the lower surface of the movable beam 2, and the flanges prevent the wheels from coming off.

Since the present invention has the above configuration, if the piston rod of the lift cylinder 17 is contracted, the connecting rod 1
6 is retracted, and the lifting rod 10 of the hook-shaped lever 9 is moved by its driving rod 12.
Is pulled toward the lift cylinder 17 by the pin 14 of the connecting rod 16, so that the balance pin 11 pivots toward the anti-lift cylinder 17 side as a fulcrum,
The T-shaped bearing 6 pivoted at the tip of the lifting rod 10 also rises while making an arcing motion, and the two lift rollers 5 a and 5 b pivoted by the T-shaped bearing 6 push up the shift rail 3. Thereafter, when the piston rod of the lift cylinder 17 is extended, the lift rollers 5a and 5b are lowered, and the shift rail 3 is lowered. The lifting rod 10 of the hook-shaped lever 9 is
Is horizontal when it is at the bottom position.

FIG. 2 shows the dimensional relationship in the example of FIG. 1, and the two-dot chain line in the figure shows the state after the movable beam 2 has risen. When the movable beam 2 is at the lowest position, the distance between the lower surface of the shift rail 3 and the balance pin 11 is H, the distance between the balance pin 11 and the connecting rod 16 is B, and the distance between the balance pin 11 and the T-shaped bearing 6 is The distance from the lifting rod 10 is l,
Let d be the diameter of the lift rollers 5a and 5b,
A, the distance between the lifting rod 10 and the lifting rod 10 is A,
a, 5b, the maximum ascending displacement is Δh1, the lift rollers 5a,
If the swing angle of the drive rod 12 when the height 5b rises to the maximum height is θ, and the inclination of the lift rod 10 when the lift rollers 5a and 5b are at the minimum height position is horizontal, Δh1 = l sinθ... ... (1) The following relationship is established.

On the other hand, as shown in FIG. 5, the lifting device 25 in the conventional walking beam type transfer device 28 includes a lift roller 27, a “C” -shaped lever 31, and a connecting rod 29 that moves forward and backward by a lift cylinder 30. Consists of
The "L" -shaped lever 31 is integrally formed of a lifting rod 32 and a driving rod 34, the lift roller 27 is pivotally connected to the tip of the lifting rod 32, and the connecting rod 29 is a hole 3 near the tip of the driving rod 34.
7 is pivoted via a pin 36 projecting from the connecting rod 29, and the bent portion of the "L" -shaped lever 31 is pivotally supported on bearings 35a, 35b fixed to the foundation concrete 26a, 26b via a balance pin 33. Have been.

When the piston rod of the lift cylinder 30 is retracted, the connecting rod 29 moves backward,
Since the drive rod 34 of the L-shaped lever 31 is pulled toward the lift cylinder 30 by the pin 36 of the connecting rod 29, the lift rod 32 of the L-shaped lever 31 moves in an arc toward the anti-lift cylinder 30 with the balance pin 33 as a fulcrum. Rod 3
The lift roller 27 pivoted at the tip of 2 also rises while making a circular motion, and the lift roller 27 pushes up the shift rail 3. Since the conventional lifting device has the above configuration, if the piston rod of the lift cylinder 30 is extended, the shift rail 3 is lowered by the lowering of the lift roller 27.

FIG. 3 shows the dimensional relationship in the example of FIG. 5, and the two-dot chain line in the figure shows the state after the movable beam 2 has risen. When the movable beam 2 is at the lowermost position, the distance between the lower surface of the shift rail 3 and the balance pin 33 is H, the distance between the balance pin 33 and the connecting rod 29 is B, and the distance between the balance pin 33 and the lift roller 27. L, the diameter of the lift roller 27 is D, the maximum lift displacement of the lift roller 27 is Δh2, the swing angle of the drive rod 34 when the lift roller 27 is raised to the maximum height is θ, and the lift roller 27 is at the minimum height position. If the inclination of the lifting rod 32 at φ is φ, Δh2 = L sin (θ + φ) −L sin φ = L (sin θ cos φ + cos θ sin φ) −L sin φ = (H / 2) sin θ + (HD / 2) cos θ −L sinφ (2)

However, in the conventional lifting device, in order to reduce the required power and reduce the weight, the diameter D of the lift roller 27 is set to the minimum size capable of withstanding the rolling force from the shift rail 3, that is, the wheel pressure. The length of the lifting rod 32 is set to the minimum allowable length so that the lifting force based on the principle of leverage increases.

Since the balance pin 33 must endure the strength corresponding to the moment generated in the lever, the balance pin 33 has to be formed to have a considerably large diameter and the minimum allowable length of the lifting rod 32. The center of 33 is necessarily located near a vertical line in contact with the roller surface of the lift roller 27 in contact with the shift rail 3 of the lift roller 27, so that cos θ = 1 / L · D / 2... (3) The following relationship is established. In addition, as is apparent from FIG. 3, H <D...... (4) sinφ = 1 / L (HD−2) (5) The relationship is established.

Next, in the lifting device 4 of the present invention and the conventional lifting device 25, the rising height Δh of the movable beam 2
1, Δh2, B, H, θ, and the length l of the lifting rod 10 when the rolling force W from the movable beam 2 is the same.
And the length L cosφ formed by the lifting rod 32 will be compared below.

From the above equations (1) and (2), the following equation holds: l sin θ = (H / 2) sin θ + (HD / 2) cos θ−L sin φ (6) If this equation is rearranged, l = H / 2 + (HD / 2) cosθ / sinθ−L sinφ / sinθ = H / 2 + 1 / sinθ ｛(HD / 2) cosθ−L sinφ｝ = H / 2 + 1 / Sinθ ｛(HD / 2) cosθ− (HD / 2)｝ = H / 2 + 1 / sinθ ｛(HD / 2) (cosθ−1) (7)

Here, the driving rod 12 (the present invention) and the driving rod 3
4 (conventional example) is 0 <cosθ <1 if each of the deflection angles θ is 0 ° <θ <45 °, so that 1 / sinθ (H−D / 2) (cosθ−1) <0. ... (8) Therefore, when 0 ° <θ <45 °, the following relational expression holds: 1 <H / 2 (9)

From the equation (4), since the relationship of H / 2 <D / 2 is satisfied, 1 <H / 2 <D / 2. From the equation (3), since there is a relationship of L cos φ = D / 2,
1 <Lcosφ. Since the rolling force from the movable beam 2 is W, the moment required for the lifting rod 10 of the present invention to push up the shift rail 3 is Wl, and the moment required for the conventional lifting rod 32 to push up the shift rail 3 is WL cosφ. Therefore, the hook-shaped lever 9 of the lifting device 4 of the present invention and the “C” -shaped lever 3 of the conventional lifting device 25 are used.
In the case where both the deflection angles are the same angle θ, Wl
<WL cosφ holds. Therefore, it is clear that the lifting device 4 of the present invention has a smaller driving force than the conventional lifting device 25, and accordingly, it can be made lighter than the conventional device.

When the shift rail 3 is at the lowermost position, the lifting device 4 of the present invention moves the lifting rod 10 of the hook-shaped lever 9.
Is not horizontal, but the conventional elevating rod 3
2 is smaller than the angle φ formed by the angle 2 in FIG.
As is clear from FIG.
5 can be lighter.

Further, the lifting height of the movable beam 2 in the lifting device 4 of the present invention and the conventional lifting device 25 are made the same, the length l of the lifting rod 10 is shortened, and the swing angle θ of the lifting rod 12 is reduced. When the swing angle is larger than the swing angle of the drive rod 34 of the conventional lifting device 25, the difference in the relation value of W1 <WL cosφ becomes large, and thus the lifting device 4 of the present invention further reduces the driving force, so that the weight can be further reduced.

Further, in the case of the lifting device 4 of the present invention, since each wheel pressure generated on the lift rollers 5a and 5b is two wheels, the wheel pressure that the lift roller 27 of the conventional lifting device 25 bears is about 1/1. It becomes 2. Accordingly, the lift rollers 5a, 5
The diameter of b can be smaller than that of the conventional lift roller 27.

Further, since the lifting / lowering device 4 of the present invention has a small driving force, the balance pin 11 can be made thinner than the conventional one, and the inner diameter of the lift cylinder 17 can also be made small. Here, the cylinder becomes considerably thicker as its inner diameter becomes larger, and it becomes considerably expensive due to the need for sophisticated measures to prevent hydraulic oil leakage between the piston and the cylinder. Can be made extremely inexpensive because its inner diameter is smaller than that of conventional ones.

[0027]

[Embodiment] The specification is 17m in total length, 4m in total width, and the moving object 2
Table 1 below shows the results of a comparison between the lifting device 4 of the present invention and the conventional lifting device 25 in a walking beam type transport device having 45 tons, a maximum lift height of the movable beam of 100 mm, and a hydraulic pressure of 120 kg / cm ² .

[0028]

[Table 1]

In the above embodiment, according to the estimation by the present inventor, the walking beam type transfer device 28 using the conventional elevating device 25 uses about 80 tons of the steel material, while The walking beam type transport apparatus 1 using the apparatus 4 can use only about 30 tons of steel material.

[0030]

As described above, the walking beam type transport apparatus using the movable beam lifting / lowering apparatus of the present invention has the following advantages.
By drastically reducing the driving force, the weight can be significantly reduced as compared with the conventional one, and the production cost can be considerably reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a movable beam elevating device according to the present invention.

FIG. 2 is a side view showing a dimensional relationship of FIG.

FIG. 3 is a side view showing a dimensional relationship of a conventional movable beam elevating device.

FIG. 4 is a perspective view showing the concept of a conventional walking beam type transfer device.

FIG. 5 is a perspective view showing an example of a conventional movable beam elevating device.

FIGS. 6A to 6E are a front view (left side) and a side view (right side) showing a transfer order by a rectangular movement of a movable beam.

[Explanation of symbols]

1: Walking beam type conveying device 2: Movable beam 3: Shift rail 4: Movable beam elevating device 5a, b: Lift roller 6: T-shaped bearing 7: Strut 8: Pin 9: Hook lever 10: Elevating rod 11: Balance pin 12: Drive rod 13a, b: Bearing 14: Pin 15: Hole 16: Connecting rod 17: Lift cylinder 18: Bracket 19a, b, c: Foundation concrete 20: Swing groove 21: Foundation concrete 22: Floor 23: Fixed skid 24: foundation concrete 25: movable beam elevating device 26a, b, c: foundation concrete 27: lift roller 28: conventional walking beam type transport device 29: connecting rod 30: lift cylinder 31: "L" shaped lever 32 : Lifting rod 33: Balance pin 34: Driving rod 35 a, b: Bearing 36: Pin 37: Hole 3 8: Swing groove 39: Bracket 40: Foundation concrete 41: Shift cylinder 42: Moving object

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Takehiko Takasaki 9-27 Kawabuchi-cho, Yawata-Higashi-ku, Kitakyushu-shi Taihei Kogyo Co., Ltd. F-term (reference) 3F036 BA01 CA04 CB02 CB08 CB19 DD04 DD07 4K034 AA17 BA03 BA08 CA01 EA15

Claims (1)

[Claims] 1. A device 4 for lifting and lowering a movable beam 2 by engaging at least two or more levers on a reciprocating connecting rod 16 in a walking beam type transfer device 1 of a heating furnace, wherein each of the levers is a hook-like lever. 9, the bent portion of the hook-shaped lever 9 is pivoted with bearings 13a, 13b fixed to the foundation concrete 19, and the tip of the hook-shaped lever 9 on the side opposite to the connecting rod 16 is pivoted with the lower portion of the T-shaped bearing 6. The upper part of the T-shaped bearing 6 is pivotally connected to two lift rollers 5a and 5b, and each of the lift rollers 5a and 5b comes into contact with the shift rail 3 fixed to the lower surface of the movable beam 2. A movable beam elevating device in a walking beam type transport device.