JPH07100746A - Polishing device for inner surface of socket of pipe - Google Patents

Abstract

PURPOSE:To efficiently carry out polishing work on the inner surface of the socket of a casted pipe, control the polishing pressing force to a constant value, and stabilize the product quality. CONSTITUTION:A polishing tool 37 which is revolved by a rotary shaft 36 in the horizontal direction of a power unit 41 is inserted inside the receiving port 16 of a pipe 12 supported in the horizontal direction. An upward constant force which resists the weight of the power unit 41 is generated by a cylinder device 43 for generating a repulsive force. A prescribed downward polishing pressing force is generated on the polishing tool 37 by acting a downward constant force on the power unit 41 which receives the repulsive force, by a cylinder device 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blasting / cleaning device for an inner surface of a pipe receiving port.

[0002]

2. Description of the Related Art A ductile cast iron pipe having a receiving end at one end and an inserting end at the other end is generally manufactured by a centrifugal casting method. In the centrifugal casting method, the molten metal is supplied into the casting mold while rotating the casting mold having a cylindrical inner space at a high speed, whereby the outer peripheral surface of the pipe is formed by the inner peripheral surface of the mold, and the centrifugal force acts. The inner peripheral surface of the tube is naturally formed.

By the way, in cast iron pipes, the inner peripheral surface of the receiving port usually has a complicated shape, but in this centrifugal casting, a casting mold is used to form the inner peripheral surface of the receiving port. It is customary to carry out the casting operation with the core attached. This core is formed of sand, but is removed from the product by crushing after casting.

[0004]

However, if the core is simply crushed, the sand may not be completely removed particularly in the portion where the inner circumferential groove is formed in the receiving port, and the sand may remain in the product. . For this reason, in the past, an operator grinds and cleans the inner surface of the receiving port with a hand-held rotary grindstone, a rotary wire brush, etc., but it is inefficient because it is a manual work, and the grinding and sweeping pressure is constant. There is a problem that the product quality is not stable because it does not easily occur.

Therefore, the present invention solves such a problem and enables the polishing work of the inner surface of the receiving end of the casting pipe to be carried out efficiently and the pressing force of the polishing sweep can be controlled to be constant to stabilize the product quality. The purpose is to be able to.

[0006]

In order to achieve the above object, the present invention provides a polishing tool which is inserted into a receptacle of a horizontally supported tube and which is rotated by a horizontal rotating shaft, and A power unit that supports the rotary shaft and applies rotary power to the rotary shaft, a repulsion drive device that generates a constant upward force that repels the weight of the power unit, and a reaction force of the repulsion drive device. By applying a constant downward force to the existing power unit, a main drive device for generating a predetermined downward polishing and pushing pressure force on the polishing and cleaning tool is provided.

[0007]

According to such a structure, it is expected that the weight of the power unit will be extremely large compared to the polishing and pushing pressure to be applied to the polishing and sweeping tool, but this weight is roughly balanced by the repulsion drive device. To be done. Then, due to the acting force of the main drive device, a required grinding and sweeping pushing force is generated in the grinding and sweeping tool.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 11 denotes a transfer line which can support a centrifugally cast iron pipe 12 while supporting it in a horizontal direction perpendicular to its axis. Transport line 11
An illustrated cleaning station 13 is provided at a position in the middle of. Here, 14 is a supporting device, which has a supporting roller 15 for supporting the tube 12 in the horizontal direction and rotating it about its axis.

Receiving port 16 for tube 12 at blasting station 13
A polishing device 17 for polishing the inner surface of the receiving port 16 is provided at a position corresponding to. Here, 18 is a base frame, on the upper surface of which a guide rail in the axial direction of the pipe 12 is provided.
19 are provided. A traveling frame 20 is arranged on the base frame 18 so as to travel along the guide rails 19. A drive device 21 for causing the traveling frame 20 to travel is provided in the base frame 18, and the drive device 21 is configured by, for example, a combination of a rotary screw shaft and a screw nut.

As shown in FIGS. 1 and 2, a stand 22 is provided at the front end of the traveling frame 20, and the stand 22 is provided.
A stopper roller 24 is provided using a bracket 23 provided on the upper part of the. The stopper roller 24 is composed of a rotating roller, and a part of the outer peripheral edge of the tip of the receiving port 16 of the tube 12 hits the stopper roller 24 so that the tube 12 on the support roller 15 is axially oriented with respect to the traveling frame 20. Be positioned at. 25 is a shock absorber, which absorbs the collision force when the pipe 12 hits.

A guide rail 27 in the axial direction of the pipe 12 is provided on the upper surface of the traveling frame 20, and a movable frame 28 which is movable along the guide rail 27 is arranged. The traveling frame 20 is provided with a cylinder device 29 for moving the moving frame 28.

An elevating frame 31 is provided above the moving frame 28.
Is provided, and the elevating frame 31 is guided up and down by the guide members 32 at the four corners and can be raised and lowered. The upper plate 33 of the elevating frame 31 can be adjusted in the vertical position by the adjusting cylinder 34. A bearing 35 is provided at the front end of the upper plate 33, and by this bearing 35, a rotary shaft in the direction of the axial center of the pipe 2 is provided.
36 is rotatably supported. At the tip of the rotary shaft 36,
A rotary scouring tool 37 that is inserted inside the socket 16 of the tube 12 is attached. The polishing and cleaning tool 37 is composed of a rotary grindstone, a wire brush, or the like. A motor 38 is provided at the rear end of the upper plate 33, and the rotational force of the motor 38 is generated by the belt drive unit 39 and the flexible shaft 40.
Is transmitted to the rotary shaft 36 via. The power unit 41 is configured by these.

A cylinder device 43 extending upward is provided as a repulsion drive device between the moving frame 28 and the elevating frame 31, and the weight of the power unit 41 can be roughly balanced by the cylinder device 43. is there. Further, a cylinder device 44 that shortens downward is provided as a main drive device between the moving frame 28 and the elevating frame 31, and by this cylinder device 44, a polishing and sweeping pressing force can be applied to the polishing and sweeping tool 37. . Further, a shock damper 45 is provided on the moving frame 28 to prevent the elevating frame 31 from dropping suddenly.

In such a structure, the cast iron pipe 12 centrifugally cast is conveyed horizontally along the conveying line 11, and is supported horizontally by the supporting roller 15 of the supporting device 14 at the blasting / cleaning station 13.

At this time, the traveling frame 20 of the polishing and cleaning device 17
Is driven by the drive device 21 and stopped at a predetermined position according to the length of the pipe 12. On the other hand, the pipe 12 is in a state of being positioned in the axial direction by hitting the stopper roller 24,
It is slowly rotated around its axis.

On the moving frame 28, the repulsive force of the cylinder device 43 is balanced with the weight of the power unit 41, and the cylinder device 29 moves the moving frame in the balanced state.
28 is moved toward tube 12. Then, the polishing tool 37 centered according to the height of the tube 12 by the adjusting cylinder 34 stops corresponding to the portion 46 such as a groove in the socket 16 of the tube 12 to be polished. To do.

In this state, the cylinder device 44 as the main drive device acts and the polishing and cleaning tool 37 rotated by the motor 38.
Then, by applying a predetermined downward polishing and pushing force, a predetermined portion 46 inside the receiving port 16 is polished and cleaned over the entire circumference.

The polishing and sweeping pressure at this time is as shown in FIG. In FIG. 3, the vertical axis represents the magnitude of force, W is the weight of the power unit 41, F1 is the repulsive force by the cylinder device 43 as the repulsion drive device, and F2 is the force generated by the cylinder device 44 as the main drive device. Is. Here, the weight W of the power unit 41 and the force F2 generated by the cylinder device 44 act downward. The repulsive force F1 acts upward. Therefore, by adjusting the generated force F2 of the cylinder device 44 so that the upward acting F1 is slightly smaller than the total of the downward acting W and F2, the downward polishing and sweeping as shown in the figure. A pressing force F is generated.

Specifically, the weight W of the power unit 41 is 40
It is about 0 kg, while the polishing sweeping pressure F is suitably 10 kg or less. Therefore, by roughly balancing the weight W of the power unit 41 by the repulsive force of the cylinder device 43 and then finely adjusting the generated force F2 by the cylinder device 44, such a small polishing and pushing force F is accurately generated. Can be made.

In FIG. 3, the horizontal axis represents the change in the axial center position of the polishing and cleaning tool 37. Such a change occurs due to wear of the grindstone used for the tool 37, change of the diameter by replacing the grindstone with another kind of grindstone, or the like. As shown in the drawing, even if the position of the shaft center of the grinding and sweeping tool 37 changes, the grinding and sweeping pressing force F does not change and always has a constant value. This is because the weight W of the power unit 41, the force F2 generated by the cylinder device 44, and the repulsive force F1 are constant regardless of the axial center position of the polishing and cleaning tool 37.

As a construction of the blasting and cleaning device 17, it is conceivable that the weight of the power unit 41 is supported by using, for example, a compression coil spring instead of the cylinder device 43 for generating the repulsive force. However, if a spring is used, when the position of the shaft center changes due to wear of the polishing and cleaning tool 37, the amount of deflection changes correspondingly. Therefore, as shown by the broken line in FIG. Repulsive force as progresses
There is a drawback that F1 gradually increases and the required polishing and sweeping pressure F cannot be obtained.

As a structure of the blasting device 17, a power unit 41
If a counterweight that balances the weight of is used, the inconvenience of using a spring does not occur. However, in that case, a new problem arises that a considerable space is required for the counter weight.

In the end, a cylinder device 43, etc., such as the one shown in the figure, which has a compact structure, can generate a repulsive force of a constant magnitude without being affected by the abrasion of the polishing tool 37. It is suitable for use as a repulsion drive.

[0024]

As described above, according to the present invention, the repulsion drive device that generates a constant upward force that repels the weight of the power unit, and the power unit that receives the force of the repulsion drive device face downward. By applying a constant force,
Since the polishing tool has a main drive device for generating a predetermined downward polishing pressure, it is possible to efficiently perform the cleaning work on the inner surface of the socket of the casting pipe without requiring any manpower. Even if tool wear or the like occurs in the polishing tool, it is possible to always control the polishing pressure to a constant and appropriate value.

[Brief description of drawings]

FIG. 1 is an overall front view of a polishing and cleaning device for an inner surface of a pipe receiving port according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of the polishing and cleaning apparatus.

FIG. 3 is a diagram showing how a force acts in the polishing and cleaning apparatus.

[Explanation of symbols]

 12 Cast iron pipe 16 Receptacle 36 Rotating shaft 37 Abrasive tool 41 Power unit 43 Cylinder device (repulsion drive device) 44 Cylinder device (main drive device) 46 Grooves and other parts

Claims (1)

[Claims] 1. A polishing and cleaning device for an inner surface of a horizontally-supported pipe receiving port, which is inserted into the pipe receiving port,
A polishing and cleaning tool rotated by a horizontal rotary shaft, a power unit that supports the rotary shaft and applies rotary power to the rotary shaft, and a constant upward force that repels the weight of the power unit. A repulsion drive device and a main drive device that generates a predetermined downward polishing and sweeping pressure force on the polishing and cleaning tool by applying a constant downward force to the power unit that receives the force of the repulsion drive device. A blasting and cleaning device for the inner surface of the receiving end of the pipe, characterized by having.