JPH0790395B2 - Grinding unit - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grinding unit for grinding the surface of a steel plate.

[0002]

2. Description of the Related Art Steel plates used for structural members of bridges and hull members of ships are coated with rust preventive paint by removing iron oxide (black skin) adhering to the surface. Giving,
The surface of this rustproof coating is generally marked on for cutting or welding. Then, a work of cutting the marked steel plate along the cutting line or a work of welding another member along the welding line is performed. When other members are welded along the scribed welding line on the surface of the anticorrosion coating, defects such as blowholes may occur in the welded portion depending on the composition of the coating material. For this reason, prior to welding other members to the welding line, a predetermined width along the welding line is ground to remove the paint, and then the predetermined welding line is marked and welded again. ing. Further, when the steel plates are butt-welded, it is also practiced to grind the extra portion of the welded parts so that the welded parts are flush with the steel plate surface.

A grinding device for removing the rust-preventive coating formed on the surface of a steel plate or for grinding an extra portion is provided with a motor 52 on a carriage 51 as shown in FIG.
A pulley group including a contact wheel 53, a tension pulley 54, and a drive pulley 55 is provided, and an endless grinding belt 56 is wound around the pulley group. Then, the operator pushes the carriage 51 to move it to a predetermined grinding position, drives the motor 52 to move the grinding belt 56, presses the contact wheel 53 against the surface of the steel plate, and steers the carriage 51 along the welding line. I'm grinding by that.

[0004]

As described above, the peeling work of the rust preventive coating formed on the surface of the steel sheet or the grinding of the extra portion of the welded portion is performed manually. For this reason,
It requires a lot of labor and time, increases the work cost,
There are problems such as deterioration of working environment due to dust. In order to solve such a problem, the development of a grinding machine capable of mechanically performing grinding work is required. The weld line formed on the steel sheet is not limited to a straight line and often includes a gentle curve having a large curvature. Therefore, it is necessary to control the turning of the grinding belt so as to always match the tangential direction of the welding line. However, when the above-mentioned conventional grinding device is simply mounted on the traveling carriage, the weight and the turning radius of the turning portion become large, the capacity of the turning motor must be increased, and the size of the whole traveling carriage must be increased. There's a problem.

An object of the present invention is to provide a grinding unit that can be mounted on a traveling carriage and that can remove the rust-preventive coating on the surface of a steel sheet or grind an extra portion of a welded portion.

[0006]

In order to solve the above-mentioned problems, a grinding unit according to the present invention is rotatably supported by a frame, and a transmission member for transmitting power from a turning drive means is fixed to a predetermined position on the outer circumference. A hollow shaft having a support member fixed to the end thereof, a roller group including a driving roller and a contact roller arranged at a predetermined position of the support member, and an endless grinding belt wound around the roller group. , A drive motor fixed to the frame and a transmission member rotatably fitted to the hollow shaft and transmitting the power of the drive motor to one end, and the other end to the drive roller arranged on the support member. And a shaft to which a transmission member for transmitting is fixed.

[0007]

According to the above means, the grinding unit is divided into a group of rollers arranged on the support member, a grinding belt wound around the group of rollers, and a drive motor fixed to the frame, and Since the support member is fixed to the hollow shaft that is rotated by the power from the turning drive means, only the roller group arranged on the support member can be used for the grinding work for peeling the rust preventive coating on the steel plate or the grinding work for the extra portion. By turning, even if the welding line to be ground is a gentle curve, it is possible to grind along this welding line. In addition, it is possible to reduce the weight of the turning portion and the turning radius. Therefore, it is not necessary to increase the capacity of the turning motor that turns the grinding unit, and it is not necessary to increase the size of the carriage on which the grinding unit is mounted.

[0008]

EXAMPLE An example of a grinding unit to which the above means is applied will be described below with reference to the drawings. 1 is a front view of the grinding unit, FIG. 2 is a side view of FIG. 1, and FIG. 3 is a cross-sectional view of a main part. The grinding unit shown in the figure is for removing the rust preventive coating on the surface of the steel sheet or for grinding the extra portion of the welded portion. This grinding unit is configured so that it can be used by being mounted on a traveling carriage, and by a command from a numerical control device or a manual operation command, a group of rollers around the grinding belt is swung to rotate the grinding belt in a traveling direction. Is configured so that it can always be aligned with the direction to be ground. Further, in this turning unit, a drive motor for driving the grinding belt is fixedly arranged on the frame to reduce the weight of the turned portion and reduce the turning radius. Therefore, the grinding unit can be mounted on a truck that travels according to a manual operation command. However, it is preferable to use it by mounting it on a trolley controlled by a numerical controller, and in this case, the grinding work can be most effectively performed.

In the figure, a grinding unit is mounted on a carriage 2 mounted on a cross girder 1 of a traveling carriage so as to be capable of traversing, and is removably mounted on the carriage 2 via a casing 3 serving as a frame. . A drive motor 4 for driving the grinding belt 10 and a swivel drive motor 5 for swiveling a roller bracket 6 in which a group of rollers for winding the grinding belt 10 are disposed are arranged in parallel on the upper part of the casing 3. The drive motor 4 is fixed to a holding stand 3a provided on the upper portion of the casing 3, and the turning drive motor 5 is directly fixed to the casing 3 via a speed reducer. Therefore, the weight of the drive motor 4 that drives the grinding belt 10 is supported by the casing 3. A roller bracket 6 serving as a support member is disposed below the casing 3, and a roller group including a drive pulley 7, a contact wheel 8 serving as a contact roller, and a tension roller 9 is provided at a predetermined position of the roller bracket 6. It is arranged. An endless grinding belt 10 is wound around each of the rollers 7-9.

As shown in FIG. 3, inside the casing 3, a hollow shaft 11 and a drive shaft 12 fitted to the hollow shaft 11 are arranged so as to coincide with the axis of the drive motor 4. The hollow shaft 11 transmits the rotation of the turning drive motor 5 to the roller bracket 6, and is rotatably supported by a bearing 3a provided in the casing 3. Hollow shaft 11
A gear 13 that meshes with a gear 5a attached to the swing drive motor 5 is fixed at a predetermined position on the outer periphery of the gear 5, and these gears 5a, 13 form a transmission member that transmits the power of the swing drive motor 4. A roller bracket 6 is fixed to the lower end of the hollow shaft 11. The drive shaft 12 transmits the rotation of the drive motor 4 to the drive roller 7, is fitted inside the hollow shaft 11, and is rotatably supported by the bearing 11a. A coupling 14b connected to the coupling 14a fixed to the shaft of the drive motor 4 is fixed to the upper end of the drive shaft 12, and a pulley 15a is fixed to the lower end. The hollow shaft 11 and the drive shaft 12 configured as described above can rotate independently of each other's rotation.

A gear box 16 accommodating a pair of miter gears is provided at a predetermined position of the roller bracket 6. The gear box 16 is provided with a shaft 16a arranged in parallel with the drive shaft 12 and a shaft 16b arranged in the direction orthogonal to the drive shaft 12, and a pulley 15b is fixed to the tip of the shaft 16a. The drive pulley 7 is connected to the tip of the shaft 16b.
The pulley 15a fixed to the lower end of the drive shaft 12, the pulley 15b fixed to the shaft 16a of the gear box, the pulleys 15a, 15
The rotation of the drive shaft 12 is controlled by the belt 15c wound around b.
It is transmitted to 16a. At the lower end of the roller bracket 6,
Support 8a for mounting the contact wheel 8
And a support 9a for attaching the tension pulley 9
Are fixed respectively. The contact wheel 8 is rotatably attached to the tip of the support 8a, and the tension pulley 9 is rotatably attached to the tip of a tension mechanism 9b provided on the support 9a.

The drive pulley 7, the contact wheel 8 and the tension pulley 9 are arranged in parallel, and the grinding belt 10 is wound around these pulleys 7-9. The grinding belt 10 is always given an appropriate tension by a tension pulley 9 and is pressed against a steel plate (not shown) by a contact wheel 8. The outer periphery of the contact wheel 8 is covered with a material having an appropriate elasticity such as hard rubber or hard urethane, and is configured so as to be able to absorb the impact due to the fine irregularities on the steel plate surface.

In the grinding unit constructed as described above, when the drive motor 4 is driven, this rotation is transmitted to the drive shaft 12 via the couplings 14a and 14b, and the pulley is further driven.
The rotation direction is changed by being transmitted to the miter gear housed in the gear box 16 via 15a and 15b, and transmitted from the shaft 16b to the drive pulley 7 to drive the grinding belt 10. Then, by pressing the contact wheel 8 against the steel plate and moving the cross girder 1 and the carriage 2 along the welding line, the rust preventive coating formed on the surface of the steel plate by the traveling grinding belt 10 is peeled off, or the remaining portion of the welded portion is removed. It is possible to grind the heap portion.

When the welding line to be ground is composed of gentle curves, it is necessary to change the grinding direction along the welding line while grinding the steel sheet as described above.
In this case, when the turning drive motor 5 is driven by a command from the numerical controller or by a manual operation command, this rotation is transmitted to the hollow shaft 11 via the gears 5a and 13, and the roller bracket 6 fixed to the hollow shaft 11 is fixed. Turn. As a result, each roller 7 arranged on the roller bracket 6 is
9 and the grinding belt 10 revolve around the hollow shaft 11.

[0015]

As described in detail above, the grinding unit according to the present invention can be mounted on a trolley to perform a grinding work on a steel plate, so that the labor of the worker can be reduced and the worker can be reduced. Can be protected from unfavorable working environment. Further, since the grinding unit is configured by dividing the drive motor, the roller group that is the part to be swung, and the grinding belt wound around this roller group, the grinding work for removing the rust-preventive coating on the steel plate or the extra part During the grinding operation, by rotating the support member in which the roller group is arranged, even if the welding line to be ground is a gentle curve, grinding can be performed along this welding line. Further, by supporting the weight of the drive motor that drives the grinding belt by the frame, it is possible to reduce the weight of the turning portion and the turning radius. For this reason, there are features such that it is not necessary to increase the capacity of the turning motor that turns the grinding unit, and it is not necessary to increase the size of the carriage on which the grinding unit is mounted.

[Brief description of drawings]

FIG. 1 is a front view of a grinding unit.

FIG. 2 is a side view of a grinding unit.

FIG. 3 is a sectional view of a main part.

FIG. 4 is a side view of a conventional grinding device.

[Explanation of symbols]

3 is a casing, 4 is a drive motor, 5 is a swing drive motor, 6 is a roller bracket, 7 is a drive pulley, 8 is a contact wheel, 9 is a tension pulley, 10 is a grinding belt, 11 is a hollow shaft, 12 is a drive shaft, 13 is a gear, 14a, 14b
Is a coupling, 15a and 15b are pulleys, and 16 is a gear box.

Claims (1)

[Claims] 1. A hollow shaft rotatably supported by a frame, fixed to a predetermined position on the outer periphery thereof, to which a transmission member for transmitting power from a turning drive means is fixed, and a support member fixed to an end portion, and a predetermined portion of the support member. A roller group including a drive roller and a contact roller arranged at a position, an endless grinding belt wound around the roller group, a drive motor fixed to a frame, and rotatably fitted to the hollow shaft. And a shaft to which a transmission member for transmitting the power of the drive motor is fixed to one end and a shaft to which the transmission member for transmitting the power to the drive roller arranged on the support member is fixed to the other end. .