JPH045993Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a forward and backward movement device for a moving hearth type heating furnace such as a walking beam type or a walking hearth type. For example, in a walking beam heating furnace, a moving beam is moved in a rectangular manner by a forward and backward movement device and a lifting device, and the material to be heated is heated while being transferred alternately to the moving beam and the fixed beam. The present invention relates to an improvement of the forward and backward movement device in such a case.

<Prior Art> Conventionally, a driving method using a hydraulic cylinder has been generally used as a forward and backward movement device in a moving hearth type heating furnace.

Furthermore, a device has been proposed that utilizes the forward and backward movement of a nut screwed into a motor-driven ball screw (Japanese Patent Publication No. 62-24715). This conventional device has a pair of rollers arranged on the left and right sides of a nut, and the rollers are housed in a pair of vertical holes on the left and right sides of a runner of a moving frame, and a ball screw is rotated by a motor drive. When the nut screwed into moves back and forth, a pair of vertically elongated holes on the left and right move back and forth via rollers, and the movable frame moves forward and backward together with the runners in which the longitudinal holes are opened.

<Problems that the invention aims to solve> However, in conventional devices driven by hydraulic cylinders, the accuracy of the forward and backward stroke amount is poor due to the large inertia force applied to the hydraulic cylinder, and the shock is large when starting and stopping. There is a problem.

Further, the above-mentioned conventional device that utilizes the forward and backward movement of a nut screwed into a motor-driven ball screw has the following problems.

(1) If the roller and the vertical hole that houses it are in close contact with each other, when the runner with the vertical hole opened goes up and down with the moving frame, the contact parts at both ends of the roller that are in close contact with the vertical hole are simultaneously exposed in the same direction. Since force is applied, it is physically extremely difficult to do so.
Therefore, in the case of the above-mentioned conventional device, it is necessary to provide a gap between the roller and the vertically elongated hole, but when such a gap is provided, the gap prevents the forward and backward movement of the runner with the vertically formed hole, that is, the forward and backward movement of the moving frame. causing a misalignment. The gaps are added up sequentially from the charging side to the extraction side of the heating furnace.
Make the gap in full reverse even larger.

(2) If a positional misalignment occurs between a pair of left and right runners due to distortion of the moving frame, etc., this misalignment will have a direct effect on the ball screw, etc. due to the relationship between the runner's vertical hole → roller → nut → ball screw. As a result, a significantly excessive load is applied to the ball screw, etc., and in some cases, they may be damaged.

The present invention provides an improved forward and backward movement device that overcomes the problems of the prior art as described above.

<Means for Solving the Problems> According to the present invention, a fixed shaft is vertically suspended from a nut that is screwed into the drive ball screw, and a sleeve is rotatably engaged with the fixed shaft. A front and rear movable hearth type heating furnace characterized in that a pair of rollers are rotatably supported on both sides of the sleeve, and a runner of a movable frame is slidably fitted between the pair of rollers. related to the advance device.

The important point of this invention is that pairs of rollers are arranged on each side of the nut, and the runners of the moving frame are slidably fitted between each pair of rollers, so that the runners can be smoothly raised and lowered, and the runners can be moved forward and backward. At the same time, by attaching the roller to the nut via a rotatable sleeve instead of directly connecting it to the nut, even if there is any misalignment in the positional relationship of the runner, this can be absorbed by the sleeve and the ball screw etc. The structure is such that no unreasonable load is applied to the device.

Hereinafter, the configuration of the present invention will be explained in more detail based on the drawings.

<Example> Figure 1 is a side view of essential parts showing an example of the present invention.
2 is a cross-sectional view of FIG. 1, and FIG. 3 is an enlarged longitudinal sectional view of FIG. 1.

A drive ball screw 13 connected to a motor 12 via a speed reducer 11 is rotatably supported.
A nut 21 is screwed onto the drive ball screw 13.
Stepped fixed shafts 22, 23 are vertically suspended from the nut 21, and sleeves 33, 34 are attached to the fixed shafts 22, 23 with covers 31, 32.
is engaged. The sleeves 33 and 34 surround the nut 21 as if they were fixed shafts 22 and 2.
It is designed to be able to rotate relative to 3.

A pair of rollers 5 are provided on the outside of each of the sleeves 33 and 34 between substantially T-shaped bearing members 41 and 42.
1 and 52 and a pair of rollers 53 and 54 are rotatably supported, and a runner 62 of a moving frame 61 is slidably fitted between the pair of rollers 51 and 52. A runner 63 of the movable frame 61 is slidably fitted into the movable frame 61.

Guide rollers 43 and 44 are rotatably supported at the lower ends of the bearing members 41 and 42, and the guide rollers 43 and 44 are placed on rails 45 and 46 (in the drawing, the guide rollers 44 and 44 are mounted on rails 45 and 46, respectively). (The rail 46 is omitted).

<Operation> Next, the operation of the present invention will be explained based on an illustrated embodiment. When the motor 12 is driven and the driving ball screw 13 is rotated in the forward direction via the reducer 11, the nut 21 screwed onto the driving ball screw 13 moves forward and engages with the fixed shafts 22 and 23 of the nut 21. rollers 51, 5 together with sleeves 33, 34
2, 53, 54 also move forward, and the rollers 51, 52
The runner 62 and the roller 5 are slidably fitted between the runner 62 and the roller 5.
The movable frame 61 also moves forward together with the runner 63 that is slidably fitted between the runners 3 and 54. Next, the driving of the motor 12 is stopped, and the movable frame 6 is moved by a known lifting device (not shown) (for example, an eccentric wheel type lifting device).
1 and raise the runners 62 and 63. When the motor 12 is driven again and the driving ball screw 13 is reversed via the reducer 11, the nut 21, fixed shafts 22, 23, sleeves 33, 34, rollers 51, 52, 53, 54
moves backward, and the moving frame 61 moves backward together with the runners 62 and 63. Then, the drive of the motor 12 is stopped again, and the runners 62 and 63 are lowered together with the moving frame 61 by a lifting device (not shown).

This process is repeated below, but when the movable frame 61 moves back and forth or goes up and down as described above, the runner 62 of the movable frame 61 is held by the pair of rollers 51 and 52 from both sides, as if by the roller 51. , 52, and the relationship between the runner 63 and the pair of rollers 53 and 54 is the same, so there is no deviation at all in its forward and backward movement, and there is no physical strain in its elevation. . Moreover, since the sleeves 33 and 34 are rotatably attached to the nut 21 via the fixed shafts 22 and 23, distortion etc. occur in the movable frame 61, and the runners 62 and 63
Even if a deviation occurs in the positional relationship between the two, the sleeves 33 and 34 absorb the deviation, so that the deviation does not have an adverse effect on the driving ball screw 13 and the like.

<Effects of the invention> As explained above, in the present invention, there is no deviation in the forward and backward movement of the moving frame, there is no force in raising and lowering the moving frame, and there is no need to apply an unreasonable load to the drive ball screw, etc. There is an effect that there is no such thing.

[Brief explanation of the drawing]

FIG. 1 is a side view of essential parts showing an embodiment of the present invention;
2 is a cross-sectional view of FIG. 1, and FIG. 3 is an enlarged longitudinal sectional view of FIG. 1. 11...Reducer, 12...Motor, 13...Drive ball screw, 21...Nut, 33, 34...
Sleeve, 51, 52, 53, 54...roller,
61...Moving frame, 62, 63...Runner.

Claims (1)

[Scope of utility model registration request] A fixed shaft is vertically disposed vertically from a nut screwed onto the drive ball screw, a sleeve is rotatably engaged with the fixed shaft, and a pair of rollers are rotatably supported on each side of the sleeve. 1. A forward and backward movement device for a movable hearth type heating furnace, characterized in that the runners of the movable frame are slidably fitted between the pair of rollers.