JP3007486B2 - Automatic bolt polishing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic polishing apparatus for polishing a thread portion of a bolt, and more particularly to an automatic bolt polishing apparatus suitable for polishing large stud bolts for reuse.

[0002]

2. Description of the Related Art In a nuclear power plant, for example, periodic inspections of nuclear reactor equipment are performed at regular intervals, and internal inspection and repair of a steam turbine are also performed as part of the periodic inspections. In this case, the turbine casing is once opened by removing bolts and nuts as fasteners, closed again after inspection and maintenance, etc., and fastened by bolts and nuts.

[0003] By the way, since the bolts for fastening the turbine casing are deteriorated due to high heat during normal operation, it is necessary to repair the threaded portion by polishing in order to ensure the reliability of reuse during assembly.

Heretofore, such polishing has been individually performed manually by an operator by holding and fixing bolts and using a wire brush.

[0005]

However, when fastening the turbine casing, a large amount of bolts such as stud bolts are used in addition to ordinary bolts. It takes time and effort, and the work efficiency is very poor. Particularly, in the case of large stud bolts, since screws are formed at both ends, gripping is troublesome and work is difficult, and the finished state of polishing often varies.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide an automatic bolt polishing apparatus capable of effectively reducing labor, automatically stabilizing quality, and shortening a construction period.

[0007]

In order to achieve the above object, an automatic bolt polishing apparatus according to the present invention comprises an endless belt-shaped rotating body which is intermittently driven in one direction around a horizontal axis, and the rotating body. A plurality of bolts are provided at intervals in the direction of rotation, and in pairs arranged in parallel with the axis of the rotator so as to be able to rotate integrally with the rotator facing each other. A bolt receiver for detachably supporting the vicinity of both ends thereof, and a non-threaded portion of a bolt supported by the bolt receiver being detachably gripped at an upper moving position of the rotating body to perform an ascending / descending operation; A chucking mechanism that stops at one end, and a bolt that has been gripped and lifted by the chucking mechanism and approached and moved along the axial direction of the bolt,
A rotary brush type polishing mechanism for polishing the threaded portion of the bolt is provided, wherein a rising side of the rotating body is a bolt supply section and a descending side is a bolt discharge section.

[0008]

During polishing, bolts are sequentially supplied to the bolt holder from a bolt supply unit set on the rising side of the rotating body, and the bolts supported by the bolt receiving unit are sequentially intermittently driven by the rotating body. Is transported upward.

The conveyed bolts intermittently stop at the upper rotation position, and the chucking mechanism provided at a position corresponding to the stop position grips the bolt at a substantially intermediate position in the axial direction and rises. It stops at the predetermined ascent position and is positioned and fixed.

The polishing mechanism moves closer to the positioned bolt along the axial direction of the bolt during the stop time set in the intermittent drive, and the thread of the bolt is polished by the rotating brush type operation.

After the polishing is completed, the polishing mechanism is separated along the axial direction of the bolt, the chucking mechanism is lowered, and the polished bolt is returned to the bolt holder again. Thereafter, the rotating body rotates intermittently again, the next bolt stops at the upper rotation position, and the gripping by the chucking mechanism and the polishing operation by the polishing mechanism are sequentially performed in the same manner as described above.

The bolt returned to the bolt receiver is supplied downward by the rotating body and then discharged to a predetermined discharge portion.

Therefore, according to the present invention, only by supplying a bolt as an object to be polished to the bolt holder, the bolt is automatically grasped by the chucking mechanism, and is automatically automatically successively formed by the rotating brush type polishing mechanism. Since the bolt is polished and the polished bolt is automatically discharged by the discharging mechanism, a series of operations of feeding, polishing, and discharging the bolt can be performed automatically and continuously without requiring any manual operation. As a result, it is possible to effectively improve the work efficiency, shorten the construction period, and the like. In particular, the work for polishing large stud bolts and the like for a turbine casing can be greatly reduced as compared with the related art.

In addition, since the polishing operation for each bolt is mechanically performed and a uniform finish is obtained, the polishing quality can be stabilized.

[0015]

An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show the overall structure of the apparatus.
3 to 5 show a partial configuration.

The present embodiment relates to an example of polishing a stud bolt. A rotating body 2, a bolt receiver 3, and a chucking mechanism 4 are mounted on a base 1 with casters 1a movable on the floor.
And a polishing mechanism 5. 1b is a stand 1
Is a handle for moving operation.

The rotating body 2 is a pair of left and right endless chains 2
and is intermittently driven in one direction a around a horizontal axis by a motor 7 via a chain wheel 6.

The bolt holders 3 are provided so as to be rotatable integrally with the rotating body 2 at intervals along the rotation direction a of the rotating body 2 and opposed to each other in a pair parallel to the axis of the rotating body 2. An opening is provided on the outer peripheral side of the rotating body 2 so as to detachably support the vicinity of both ends of the plurality of bolts A.

The ascending side of the rotating body 2 is a bolt supply section B, the upper moving side is a polishing section C, and the descending side is a bolt discharge section D.

The chucking mechanism 4 removably grips the non-threaded portion A2 of the bolt A supported by the bolt receiving member 3 at the polishing portion C, which is the upper moving position of the rotating body 2, and moves up and down. It stops at the ascending position once. That is, the chucking mechanism 4 slidably supports the pair of chucks 8, whose opposing surfaces disposed substantially at the center of the gantry 1 are recessed, on the horizontal upper surface of the support block 9,
These chucks 8 are moved in the opposite direction b by an air cylinder.
And the support block 9 is moved up and down
It is configured to be supported up and down by 0. The elevating device 10 has a pair of vertical air cylinders 12a and 12b supported on the gantry 1 via a bracket 11, and when ascending, the first air cylinder 12a and the second air cylinder 12b
, And vice versa in the vertical direction c.

The chucking mechanism 4 includes the air header 1
3 is controlled and driven by a control device including the cradle 1, and is activated after detecting that the bolt A has come to the polishing position by the proximity sensor 14 arranged on the upper portion of the gantry 1, and receives the bolt A from the bolt receiver 3 to ascend. It stops during polishing by the following polishing mechanism 5 and descends after the polishing is completed.

The polishing mechanism 5 is of a rotary brush type that moves close to the bolt A gripped and raised by the chucking mechanism 4 and stopped along the axial direction of the bolt A, and grinds the screw portion A1 of the bolt A. ing.

That is, as shown in FIGS. 3 to 5, a pair of polishing mechanisms 5 are arranged on the gantry 1 in an opposed state, and each of these polishing mechanisms 5 is provided on each side of the gantry 1 so as to be foldable. Each is supported by a wing-shaped rotation support device 15. The rotation support device 15 includes a horizontal pin 16a
Arm 17 supported via
and an air spring 18 that horizontally supports the rotating arm 17 via the b. The rotating arm 17 is positioned in a horizontal state by a stopper 19. The operation of the rotation arm 17 is manually performed, and can be easily operated in the rotation direction d with a certain degree of overpressure.

Each of the polishing mechanisms 5 includes a moving table 21 slidably supported by a bed 20 formed on a rotating arm 17.
An air cylinder 22 for driving the moving table 21 in one horizontal direction e; a motor 24 mounted on the moving table 21 via a support 23; and a brush chuck 25 on an output shaft 24a of the motor. And a polishing brush 26 connected thereto.

The polishing brush 26 is formed by integrally providing a rotating cylinder 27 on a mounting shaft 26a, and brushing bristles 28 on the inner periphery of the rotating cylinder 27 in a centripetal manner. Polishing can be performed in a state where the screw portion A1 of A is fitted. The brush bristles 28 of the brush 26 are implanted in a base frame 28a, and the base frame 28a is detachably held by a rotating cylinder 27 so as to be replaceable. Above the brush 26, there is provided an arm 39 protruding further to the tip side. At the tip of the arm 39, the tip position of the bolt A is detected and the motor 24 is started. A bolt detection switch 40 for stopping the switch 24 is provided.

Reference numeral 29 denotes a supply mechanism for automatically supplying the bolt A, which is disposed in the bolt supply section B, which is the ascending side of the rotating body 2. Reference numeral 30 denotes a discharge mechanism for automatically discharging the bolt A, It is arranged at a certain bolt discharge part D.

During polishing, the bolts A are sequentially supplied from the supply mechanism 29 to the bolt receiver 3 by the bolt supply section B set on the rising side of the rotating body 2 and are supported by the bolt receiver 3. Bolt A is sequentially driven by the rotation of the rotating body,
It is conveyed intermittently upward. The supply state of the bolt to the bolt receiver 3 is detected by the sensor 31.

The conveyed bolt A stops at the polishing section C, which is the upper rotation position, via the rotating body 2 by the detection of the proximity sensor 14, and is operated by the chucking mechanism 4 provided at a position corresponding to the stop position. The bolt is gripped and raised at a substantially intermediate position in the axial direction, stopped at a predetermined raised position (see FIG. 1), and positioned and fixed.

During the stop time set in the intermittent drive with respect to the positioned bolt A, each polishing mechanism 5 moves closer (forward) from both axial sides of the bolt A. And
When the tip of the brush A is detected by the bolt detection switch 40, the motor 24 starts and the brush 26 starts rotating, and the screw portion A1 is polished by advancing and retreating at a constant stroke, for example, a stroke of 100 mm. . After the two screw portions A1 are polished by the rotating brush type operation, the polishing mechanism 5 is separated (retracted) along the axial direction of the bolt A, and the halt detection switch 40 detects that the brush 26 is separated from the bolt A. Then, the motor 24 stops. Thereafter, the chucking mechanism 4 descends, and the polished bolt A is returned to the bolt receiver 3 again. Thereafter, the rotating body 2 rotates intermittently again, and the next bolt A
Is stopped at the upper rotation position, and the same gripping by the chucking mechanism 4 and the polishing operation by the polishing mechanism 5 are sequentially performed.

The bolt A returned to the bolt receiver 3 is supplied downward by the rotating body 2 and then automatically discharged to the discharge mechanism 30 at the discharge section D.

Therefore, according to the present embodiment, the bolt A, which is the object to be polished, is simply supplied to the bolt holder 3, and the bolt A is automatically grasped by the chucking mechanism 4 so that the rotary brush type polishing mechanism 5 , And the bolt A after polishing is automatically discharged by the discharge mechanism 30, so that a series of operations of feeding, polishing and discharging the bolt are automatically and continuously performed without requiring any manual operation. The work efficiency can be improved and the construction period can be shortened effectively. In particular, the work of polishing the large stud bolts for the turbine casing, which are the bolts A according to the present embodiment, can be significantly reduced in labor compared to the related art.

In addition, since the polishing operation for each bolt is mechanically performed to achieve a uniform finish, the polishing quality can be stabilized.

In the above embodiment, the present invention is applied to polishing of a stud bolt having double screws, but it is needless to say that the present invention can be applied to a single screw bolt. In this case, only one polishing mechanism 5 needs to be used.

[0035]

As described above, according to the automatic polishing apparatus according to the present invention, a series of operations of supplying, polishing, and discharging bolts can be automatically and continuously performed without requiring any manual operation, thereby improving work efficiency and shortening the work period. It is possible to effectively reduce the length of work, and in particular, it is possible to significantly reduce the labor required for polishing large bolts for turbine casings as compared with the related art. In addition, excellent effects such as uniform finish can be obtained and polishing quality can be stabilized.

[Brief description of the drawings]

FIG. 1 is a front view showing one embodiment of an automatic polishing apparatus according to the present invention.

FIG. 2 is a plan view of FIG. 1;

FIG. 3 is an enlarged side view of FIG. 1;

FIG. 4 is a view showing a use state of the chucking mechanism of the embodiment.

FIG. 5 is a plan view of FIG. 4;

[Explanation of symbols]

 2 Rotating body 3 Bolt holder 4 Chucking mechanism 5 Polishing mechanism A Bolt A1 Screw part A2 Non-thread part B Bolt supply part D Bolt discharge part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B23G 9/00 B24B 29/00 B24B 29/02 B24B 41/06

Claims (1)

(57) [Claims] An endless rotating body intermittently driven in one direction around a horizontal axis, and a pair of opposed rotating bodies spaced apart in a rotating direction of the rotating body and parallel to the axis of the rotating body. A bolt receiving member that is provided so as to be integrally rotatable with the rotating body, that is open to the outer peripheral side of the rotating body, and that detachably supports the vicinity of both ends of the plurality of bolts, and a bolt that is supported by the bolt receiving member; The chucking mechanism detachably grips the non-threaded portion at the upper moving position of the rotating body, moves up and down, and temporarily stops at the raised position, and a bolt gripped and raised by the chucking mechanism and stopped. A rotating brush type polishing mechanism that moves close to and moves along the axial direction of the bolt and grinds a screw portion of the bolt, wherein a rising side of the rotating body is a bolt supply section and a descending side is a bolt discharge section. And bolts themselves Dynamic polishing equipment.