Blast device

Abstract

To provide a blast device which can grind an elongated workpiece.SOLUTION: A blast device 1 grinds the inside of a cylindrical workpiece W and includes: a support pipe 14 which supports the workpiece W so that the center axis of the workpiece W inclines relative to a horizontal direction at a predetermined inclination angle; a first rotation mechanism which rotates the workpiece W around its center axis; a nozzle 21 which is provided obliquely upward on the support pipe 14, extends inclining at the predetermined inclination angle, and projects a grinding material supplied from a grinding material supply part; and a nozzle moving mechanism 23 which moves the nozzle 21 along its axial direction and may insert the nozzle 21 into the workpiece W supported by the support pipe 14.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a blasting device for blasting a cylindrical object to be cleaned (hereinafter referred to as a "workpiece"). [Background technology]

[0002] Patent Document 1 discloses an apparatus for cleaning a cylindrical workpiece, which holds a cylindrical workpiece with its axis facing vertically, fixes a nozzle for projecting an abrasive material to the underside of the cylindrical workpiece, and projects the abrasive material from the nozzle to clean the inner surface of the cylindrical workpiece. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2006-007359 A Summary of the Invention [Problem to be solved by the invention]

[0004] The blast cleaning device of Patent Document 1 can blast clean the inner peripheral surface of a workpiece with a total length of up to 3 m, for example, but cannot blast clean a workpiece with a total length of 3 m or more.

[0005] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a blasting device capable of cleaning long workpieces. [Means for solving the problem]

[0006] In order to solve the above problems, a blasting device in one embodiment of the present invention is a blasting device for cleaning the inside of a cylindrical workpiece, and includes a support member that supports the workpiece so that its central axis is inclined at a predetermined angle with respect to the horizontal direction, a first rotation mechanism that rotates the workpiece around its central axis, a nozzle that is provided diagonally upward with respect to the support member, extends at the predetermined angle, and projects an abrasive material supplied from an abrasive material supply section, and a nozzle moving mechanism that moves the nozzle along its axial direction and is configured to be able to insert the nozzle into the workpiece supported by the support member.

[0007] The support member may further include a second rotation mechanism that rotatably supports the support member, the support member having an intermediate portion located between both end portions, and the second rotation mechanism may be configured to rotate the support member around a central axis provided in the intermediate portion.

[0008] The nozzle moving mechanism may further include a horizontal movement mechanism that moves the nozzle and the nozzle movement mechanism in a horizontal direction, and a lifting mechanism that raises and lowers the nozzle and the nozzle movement mechanism in a vertical direction.

[0009] The nozzle moving mechanism may further include a nozzle stand supporting the nozzle and the nozzle moving mechanism, a hose holding part connected to the nozzle stand, and a hose held by the hose holding part for supplying an abrasive to the nozzle, wherein the hose holding part has a pair of guides connected to the nozzle stand and extending so as to slope downward as it moves away from the nozzle stand, and a cart arranged between the pair of guides and movable along the pair of guides and configured to lower downward under its own weight, and the hose may extend from the abrasive supply part to the hose holding part, and at the hose holding part, extend diagonally downward below the space between the pair of guides to the cart, turn around on the cart, extend diagonally upward to the nozzle, and be connected to an end of the nozzle.

[0010] The device may further include a long member connected to the tip of the nozzle, and a tensioning mechanism that pulls the long member from the side opposite to the side where the nozzle is located with respect to the support member. Effect of the Invention

[0011] According to the present invention, a blasting device capable of abrasively cleaning a long workpiece can be provided. [Brief description of the drawings]

[0012] [Figure 1] FIG. 2 is a front view of the blasting device according to the embodiment. [Diagram 2] FIG. 2 is a top view of the blasting device of FIG. [Diagram 3] 11 is a side view of the work support portion as viewed from the rear end support member side. FIG. [Figure 4] FIG. 2 is a side view of the nozzle support portion 20. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] A blasting device according to an embodiment of the present invention will be described with reference to the drawings.

[0014] <Overall composition> First, the overall configuration of the blasting device 1 according to this embodiment will be described. The blasting device 1 according to this embodiment is a blasting device suitable for treating the inner surface of a workpiece. The workpiece is a double-ended seamless cylinder.

[0015] Figures 1 and 2 are a front view and a top view of the blasting device 1. Figure 3 is a side view of the work support part 10 as viewed from the rear end support member 13 side. Figure 4 is a side view of the nozzle support part 20. The work W, the convex part 14A, the work receiving part 14B, and the discharge pipe 14C are omitted in Figure 2, and the hose holding part 24 is omitted in Figure 4.

[0016] The blasting device 1 is installed on a floor surface 2 in which an installation hole 2a is formed. The installation hole 2a has a shallow hole portion 2b and a deep hole portion 2c deeper than the shallow hole portion 2b. The blasting device 1 includes a workpiece support portion 10, a nozzle support portion 20, an abrasive material recovery and supply portion 30, and a control portion 40. The control portion 40 has a control computer composed of a calculation portion, a storage portion, etc., and controls the operation of the workpiece support portion 10, the nozzle support portion 20, and the abrasive material recovery and supply portion 30. In this specification, the longitudinal direction of the blasting device 1 is the "length direction" of the blasting device 1, the nozzle support portion 20 side is the "front side", the abrasive material recovery and supply portion 30 side is the "rear side", and the direction perpendicular to the "length direction" is the "width direction" (left and right direction in Figs. 3 and 4).

[0017] The workpiece support section 10 has a support table 11, two air cylinders 12, two front end support columns 13, two support pipes 14, a motor 15, a shaft 16, a plurality of drive rollers 17, and a plurality of driven rollers 18. The support table 11 is provided on the bottom surface of the shallow hole section 2b, and mainly has a horizontal member 11A and two pillar members 11B. A shaft 11C is installed on the upper end of the two pillar members 11B. The two air cylinders 12 are installed on the horizontal member 11A. The two front end support columns 13 are located in front of the support table 11 and installed on the floor surface 2. The support table 11, the shaft 11C, and the two air cylinders 12 correspond to a second rotation mechanism.

[0018] A shaft 11C passes through each support pipe 14 and is rotatably supported by the shaft 11C. The shaft 11C passes through a portion of an intermediate portion 14D of each support pipe 14 that is rearward of the center in the front-rear direction. The front end of each support pipe 14 is supported by each front end support column 13. The upper end of each front end support column 13 is located above the shaft 11C. Thus, each support pipe 14 is inclined with respect to the horizontal direction so that the rear end is lower than the front end. The inclination angle of each support pipe 14 is, for example, 2° to 7°.

[0019] The rear ends of the two support pipes 14 are provided with convex parts 14A that protrude upward, and the workpiece receiving part 14B is rotatably attached to the convex parts 14A. The workpiece receiving part 14B is configured to be able to support the rear end part of the cylinder W, and has a through hole (not shown). The discharge pipe 14C is attached to the workpiece receiving part 14B. When the piston rod of the air cylinder 12 extends, the support pipe 14 rotates around the shaft 11C, and the rear part of the support pipe 14 lowers. The inclination angle of the support pipe 14 at this time is, for example, 65° to 75°. The support pipe 14 corresponds to a support member.

[0020] The motor 15 is provided on one of the support pipes 14. The shaft 16 is provided on one of the support pipes 14 and is driven to rotate by the motor 15. The multiple drive rollers 17 are provided on the shaft 16 and are configured to rotate when the shaft 16 is rotated by the motor 15. The multiple driven rollers 18 are provided on the other support pipe 14. The cylinder W is placed between the multiple drive rollers 17 and the multiple driven rollers 18. When the multiple drive rollers 17 are rotated by the motor 15, the cylinder W rotates around its central axis, and the multiple driven rollers 18 rotate due to the rotation of the cylinder W. The cylinder W is supported by the multiple drive rollers 17 and the multiple driven rollers 18 at an inclination angle (corresponding to a predetermined inclination angle) approximately equal to the inclination angle of the support pipe 14. The motor 15, the shaft 16, the multiple drive rollers 17, and the multiple driven rollers 18 correspond to a first rotation mechanism.

[0021] The nozzle support portion 20 has a nozzle 21, a nozzle stand 22, a nozzle moving mechanism 23, a hose holding portion 24, a lifting mechanism 25, and a horizontal moving mechanism 26.

[0022] The nozzle 21 is a pipe made of stainless steel and has a diameter of about 20 mm. The length of the nozzle 21 is about 0.6 m, and the nozzle is supported by a nozzle stand 22 so that the nozzle stand 22 is at an inclination angle substantially equal to the inclination angle of the support pipe 14.

[0023] The nozzle stand 22 has a pair of front and rear frames 22A, a pair of front vertical frames 22B, a pair of rear vertical frames 22C, a pair of inclined frames 22D, a pair of inner frames 22E, a pair of guide frames 22F, and a receiving portion 22G. The pair of front and rear frames 22A extend in the length direction and are spaced apart in the width direction. Each front vertical frame 22B extends upward from a front portion of the center of the front and rear frames 22A. Each rear vertical frame 22C extends upward from the rear end of the front and rear frames 22A. Each inclined frame 22D is provided so as to connect the upper ends of the front vertical frame 22B and the rear vertical frame 22C. The inclination angle of each inclined frame 22D is approximately equal to the inclination angle of the support pipe 14. Each inclined frame 22D has a channel that opens to the inside and functions as a rail. The pair of inner frames 22E are provided inside the upper ends of the pair of front vertical frames 22B. The pair of guide frames 22F extend obliquely rearward from the inner ends of the pair of inner frames 22E. The inclination angle of each guide frame 22F is approximately equal to the inclination angle of the support pipe 14. The receiving portion 22G is provided so as to protrude downward from the inner ends of the pair of inner frames 22E, and is approximately V-shaped.

[0024] The nozzle moving mechanism 23 has a dolly 23A, a motor 23B, a sprocket 23C, and a chain 23D. The dolly 23A has a platform 23A1 located between a pair of guide frames 22F, and a plurality of rollers 23A2 located in the channel of a pair of inclined frames 22D. The motor 23B is provided on the dolly 23A. The sprocket 23C is connected to the output shaft of the motor 23B. The chain 23D is provided along the upper surface of one of the guide frames 22F. The sprocket 23C is engaged with the chain 23D. A connecting shaft 23E extends downward from the lower side of the dolly 23A, and the nozzle 21 is connected to the lower end of the connecting shaft 23E.

[0025] When the motor 23B is driven to rotate the sprocket 23C, the sprocket 23C meshes with the chain 23D, so the carriage 23A moves backward. As a result, the nozzle 21 connected to the carriage 23A via the connecting shaft 23E moves backward. The rollers 23A2 of the carriage 23A are located within the pair of guide frames 22F, so the carriage 23A moves along the pair of guide frames 22F. Since the inclination angles of the pair of guide frames 22F and the nozzle 21 are approximately equal, the nozzle 21 can move backward along its axial direction while maintaining its inclination angle. By rotating the sprocket 23C in the reverse direction by the motor 23B, the nozzle 21 moves forward. When the nozzle 21 is in the forwardmost position, the front end of the nozzle 21 is held by the receiving portion 22G.

[0026] The hose holding unit 24 has a pair of guides 24A and a dolly 24B. The pair of guides 24A have a channel that opens inward and functions as a rail. Each guide 24A is connected to the front vertical frame 22B of the nozzle stand 22. The height of the rear end of each guide 24A is configured to be slightly lower than the height of the front end of the nozzle 21 when the nozzle 21 is positioned at the most forward position. Each guide 24A extends so as to incline downward as it moves away from the front vertical frame 22B (as it moves forward). The center of each guide 24A is supported by the front end of the front-rear frame 22A. The dolly 24B has a stand located between the pair of guides 24A, multiple rollers located in the channels of the pair of guides 24A, and a guide roller that guides the hose 36. The dolly 24B is movable along the pair of guides 24A and is configured to move downward (diagonally downward to the right) due to its own weight.

[0027] The lifting mechanism 25 is provided under the pair of front and rear frames 22A of the nozzle stand 22. The lifting mechanism 25 has a pair of X-link mechanisms 25A and a motor (not shown). Each X-link mechanism 25A has a rod-shaped first link 25B and a second link 25C, and the first link 25B and the second link 25C are rotatably connected to each other by a rotating shaft 25D at the midpoint of their respective lengths. The upper end of the first link 25B is rotatably fixed to the front and rear frames 22A, and the lower end of the first link 25B is rotatably and slidably connected to the base of the carriage 26B of the horizontal movement mechanism 26. The upper end of the second link 25C is rotatably and slidably connected to the front and rear frames 22A, and the lower end of the second link 25C is rotatably fixed to the base of the carriage 26B of the horizontal movement mechanism 26. The X-link mechanism 25A is actuated by a motor (not shown), and the nozzle stand 22 moves up and down in the vertical direction.

[0028] The horizontal movement mechanism 26 has a pair of rails 26A, a cart 26B, a motor 26C, a sprocket 26D, and a chain rail 26E. The pair of rails 26A are installed on the floor surface 2, extending in the length direction and spaced apart in the width direction. The cart 26B has a base and a plurality of rollers attached to the base and positioned on the pair of rails 26A. The base supports the lifting mechanism 25 at both ends in the width direction. The motor 26C is provided on the cart 26B. The sprocket 26D is connected to the output shaft of the motor 26C. The chain rail 26E is provided between the pair of rails 26A on the floor surface 2 and extends in the length direction. The sprocket 26D meshes with the chain of the chain rail 26E.

[0029] When motor 26C is driven to rotate sprocket 26D, sprocket 26D meshes with chain rail 26E, so cart 26B moves backward. This causes lifting mechanism 25 and nozzle stand 22 on cart 26B to move backward. As a result, nozzle 21 also moves backward. By rotating sprocket 26D in the reverse direction by motor 26C, cart 26B moves forward.

[0030] The abrasive collecting and supplying section 30 includes a collecting box 31, a screw conveyor 32, an elevator 33, a tank 34, an air blasting machine 35, a hose 36, and a dust collector 37. The collecting box 31 is installed on the bottom surface of the deep hole section 2c. The collecting box 31 has an arc-shaped section 31A on the front side. The arc-shaped section 31A has an arc surface extending in the circumferential direction centered on the axis of the shaft 11C. A gap 31b is formed in the arc-shaped section 31A along the circumferential direction of the shaft 11C. The discharge pipe 14C of the workpiece receiving section 14B is inserted into the gap 31b. When the support pipe 14 rotates, the discharge pipe 14C moves along the gap 31b. The screw conveyor 32 is provided at the bottom of the recovery box 31 and transports the abrasive material dropping from the discharge pipe 14C to the elevator 33, which transports the abrasive material to a tank 34 provided above the floor surface 2. The air blast machine 35 supplies the abrasive material from the tank 34 to the nozzle 21 by air through a hose 36.

[0031] As shown by the dashed line in Fig. 2, the hose 36 extends forward from the air blasting machine 35 along the side of the workpiece support unit 10 and the abrasive recovery and supply unit 30, and as shown by the dashed line in Fig. 1, it extends from the lower side of the nozzle stand 22 to the lower side of the front end of the nozzle 21, passes above the rollers provided on the front vertical frame 22B, and extends diagonally downward below the space between the pair of guides 24A to the carriage 24B. The hose 36 then turns around at the guide rollers of the carriage 24B, extends diagonally upward to the nozzle 21, and is connected to the end of the nozzle 21. That is, the hoses 36 are held by the hose holding unit 24 in a state where they overlap each other in the vertical direction.

[0032] <Cleaning method> Next, a method for cleaning the blasting device 1 will be described.

[0033] A long (e.g., about 10 m) workpiece W is placed on the support table 11. An insertion guide G is attached to the opening on the front end side of the workpiece W. The motor 23B of the nozzle moving mechanism 23 is driven to move the nozzle 21 toward the workpiece W, and the tip (rear end) of the nozzle 21 is inserted into the opening of the workpiece W. The motor 15 is driven to rotate the multiple drive rollers 17, and the workpiece W is rotated about its central axis. While projecting the abrasive cleaning material together with air from the nozzle 21, the nozzle 21 is moved along its axial direction into the inside of the workpiece W. Accordingly, the hose 36 connected to the nozzle 21 is pulled and moves rearward together with the cart 24B.

[0034] After the nozzle 21 has moved to the rear end side, the motor 23B is rotated in the reverse direction, and the nozzle 21 is moved forward so as to be withdrawn from the workpiece W, and the nozzle 21 is moved until the tip (rear end) of the nozzle 21 comes near the mouth of the workpiece W. The projection of the abrasive cleaning material is stopped, and the tip (rear end) of the nozzle 21 is withdrawn from the workpiece W. In this manner, the inner peripheral surface of the workpiece W is abrasively cleaned. With the blasting device 1, a long workpiece W can be abrasively cleaned.

[0035] Also, the hose 36 connected to the nozzle 21 is pushed back, and the hose 36 returns to its original state due to the weight of the cart 24B. The hose 36 is held in a folded state so as to overlap each other in the vertical direction in the hose holding part 24, and the hose 36 is pulled out and pushed back while maintaining a state in which parts are partially overlapped with each other, so that the installation area of ​​the hose 36 can be made compact by the hose holding part 24. Also, during the blasting and cleaning process, the blasted blasting material is discharged into the recovery box 31 through the opening on the rear end side of the workpiece W, the through hole, and the discharge pipe 14C, and falls onto the screw conveyor 32.

[0036] After the grinding and cleaning process is completed, while rotating the workpiece W around its central axis, the piston rod of the air cylinder 12 is extended, and the support pipe 14 is rotated around the shaft 11C, lowering the rear side of the support pipe 14. As a result, the rear side of the workpiece W also lowers, and the grinding and cleaning material of the workpiece W is discharged into the recovery box 31. In this way, the grinding and cleaning material can be easily collected.

[0037] When a workpiece W' having a length of about 7 m is to be blasted, the lifting mechanism 25 and the horizontal movement mechanism 26 are driven. That is, the motor 26C is driven to move the carriage 26B backward to a position where the workpiece W' can be blasted, and the lifting mechanism 25 and the nozzle stand 22 are moved backward. Furthermore, a motor (not shown) of the lifting mechanism 25 is driven to operate the X-link mechanism 25A, and the nozzle 21 is lowered until it is positioned on an extension of the central axis of the workpiece W'. This allows workpieces of different lengths to be blasted.

[0038] The present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the present invention.

[0039] In the above embodiment, the workpiece W is a seamless cylinder with both ends, but it may also be a steel pipe W'' before both ends are drawn. A long member (e.g., a pipe, a round bar, a square bar, a wire, a reel thread, etc.) may be connected to the tip of the nozzle 21 from the rear end side through the workpiece W, and the long member may be pulled by a winch, which is a pulling mechanism, and the grinding and cleaning process may be performed while applying a tensile force to the nozzle 21. [Explanation of symbols]

[0040] 1: blasting device, 11: support stand, 11C: shaft, 12: air cylinder, 14: support pipe, 14D: intermediate section, 15: motor, 16: shaft, 17: driving roller, 18: driven roller, 21: nozzle, 22: nozzle stand, 24: hose holding section, 23: nozzle moving mechanism, 24A: guide, 24B: dolly, 25: lifting mechanism, 26: horizontal moving mechanism, 30: abrasive material recovery / supply section, 36: hose, W, W': workpiece, W'': steel pipe

Claims

1. A blasting device for cleaning the inside of a cylindrical workpiece, A support member that supports the workpiece so that its central axis is inclined at a predetermined inclination angle with respect to the horizontal direction; A first rotation mechanism that rotates the workpiece about its central axis; a nozzle that is provided obliquely above the support member, extends at the predetermined inclination angle, and projects the abrasive material supplied from the abrasive material supply unit; a nozzle moving mechanism configured to move the nozzle along its axial direction and insert the nozzle into a workpiece supported by the support member.

2. A second rotation mechanism that rotatably supports the support member is further provided, The support member has an intermediate portion located between both end portions, The blasting device according to claim 1 , wherein the second rotation mechanism is configured to rotate the support member about a central axis provided in the intermediate portion.

3. a horizontal movement mechanism that moves the nozzle and the nozzle movement mechanism in a horizontal direction; The blasting device according to claim 1 or 2, further comprising: a lifting mechanism that raises and lowers the nozzle and the nozzle moving mechanism in a vertical direction.

4. a nozzle stand supporting the nozzle and the nozzle moving mechanism; A hose holder connected to the nozzle stand; The cleaning apparatus further includes a hose that is held by the hose holding portion and that supplies the abrasive to the nozzle. The hose holding portion is A pair of guides connected to the nozzle stand and extending so as to incline downward as they move away from the nozzle stand; a carriage provided between the pair of guides so as to be movable along the pair of guides and configured to move downward by its own weight; 3. The blasting device according to claim 1, wherein the hose extends from the abrasive supply section to the hose holding section, and in the hose holding section, extends diagonally downward below the space between the pair of guides to the cart, turns around on the cart, extends diagonally upward to the nozzle, and is connected to an end of the nozzle.

5. A long member connected to a tip of the nozzle; The blasting device according to claim 1 or 2, further comprising a tension mechanism that pulls the elongated member from a side opposite to a side on which the nozzle is located with respect to the support member.

Images