JPH03111174A - Control unit for injection direction of rocking blast nozzle - Google Patents

Abstract

PURPOSE:To rock a blast nozzle by fitting one end of serial twin pantograph like cross lever to the rear end of the blast nozzle and making the other end thereof freely revolvably by the arm fitted to a motor shaft. CONSTITUTION:One end 6 of the serial twin pantograph like cross lever 1 supported at the tip of a revolving arm 8 is revolved by the rotation of a rocking motor 7 and accordingly the other end 9 of the cross lever 1 makes the rear end of a blast nozzle 10 to perform a circular motion like the rotation locus 15 of the rear end. Also because of the blast nozzle 10 being held by a free ring 11 at its center part, the blast nozzle tip 16 performs a circular motion like the rotation locus 17 of the tip. Namely, the rocking of the blast nozzle 10 is generated. Also, the other end 9 is moved to an optional position with its reaction as well, by positioning the center fulcrum 2 of the serial twin pantograph like cross lever 1 with its moving to the optional position along a vortex like guide groove 5 with the normal rotation, reverse rotation and stoppage of a positioning motor 3 as occasions demand, and the injection direction of the blast nozzle is changed.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is applicable to blast polishing that requires spraying in multiple directions in a narrow space, such as local polishing of a structure after assembly, and maintenance in a limited space. This invention relates to a spray direction control device for a plasto nozzle used for cleaning and polishing.

(Prior Art) In this type of blast polishing, the blast nozzle is mostly held manually. Automatic machines sometimes use multiple nozzles with different spray directions, but this makes the equipment complex and heavy. There has also been an attempt to reciprocate the positive 1-nozzle in one direction by operating a crank, but an additional operating mechanism is required for rocking in a direction perpendicular to this. Furthermore, two actuators are usually required to control the spray direction of the blast nozzle. There is a long-awaited need for a simple mechanism for use in narrow and regulated local areas.

(Problem to be solved by the invention) In order to use automatic machines to handle manual work in small areas, it is not possible to simply apply the automatic machines used in large spaces. Therefore, the objects are to minimize the movement of the holding arm which requires a large back clearance, to have a nozzle holding structure at the tip of the arm that can spray in multiple directions, and to reduce the size and weight. Furthermore, in local work where the facing distance between the plasto nozzle and the target workpiece is short,
It is necessary to widen the range of the plus 1 injection angle by swinging the plus 1 nozzle, and the purpose of this invention is to achieve this.

(Means for solving the problem) In order to swing the Plast nozzle (sliding motion) and control the injection direction (positioning), the central part of the Plast nozzle is held by a flexible ring, and a flexible ring is attached to the rear end of the Plast nozzle. Provided the motion necessary for rocking and positioning.

That is, one end of a series of two pantograph-shaped cross rods is pivoted to the rear end of the plasto nozzle, and the other end of the pantograph-like cross rod is rotated by an arm attached to a motor shaft, so that the plasto nozzle is rotated. The rear end is also rotated. This made it possible to swing the plasto nozzle (sliding motion).

3. On the other hand, in order to change the injection direction of the plasto nozzle, it is sufficient to move the central fulcrum of the two pantograph-shaped intersecting rods in series. The central fulcrum is held on both sides, and the fulcrum is slid along a fixed spiral guide groove concentric with the motor shaft. In this way, while interlocking the oscillation of the plasto nozzle, the plus 1
~The nozzle jet direction can also be changed and controlled as desired.

(Example) An explanation will be given based on FIG. 1. First, two pantograph-shaped crossing rods 1 are provided in series. The central fulcrum 2 is held by a rotating pinch arm 4 provided on a motor shaft 3a of a positioning motor 3, and at the same time is slidably fitted into a spiral guide groove 5 fixed to an external structure.

One end 6 (lower end in FIG. 1) of the two series pantograph-shaped cross rods 1 is pivotally supported on the end of a swing arm 8 provided perpendicularly to the motor shaft 7a of the swing motor 7. The other end (upper end in FIG. 1) of the two series of pantograph-shaped intersecting rods 1 is pivoted to the rear end of the plasto nozzle 10.

Next, a universal ring 11 is provided in the center of the plasto nozzle 10. In this case, vertical support shafts 13 are provided outward from the ring 12 at two locations, upper and lower, and are rotatably supported by an external structure 19 (FIG. 2). Horizontal support shafts 14 are provided inwardly at two locations on the left and right in a direction orthogonal to the vertical support shaft 13, and are rotatably supported by the plasto nozzle 10.

Next, let's talk about the operation. First, as the swing motor 7 rotates, one end 6 of the two series pantograph-shaped cross rods 1 pivotally supported at the tip of the swing arm 8 swings, and as a result, the other end 9 of the cross rod 1 turns into a plasto nozzle. 10 is caused to perform a circular motion such as a rotation locus 15 of the rear end. Moreover, since the center of the plasto nozzle 10 is held by the flexible ring 11, the tip 16 of the plasto nozzle follows the rotation locus 17 of the tip.
Perform a circular motion like this. That is, the plasto nozzle 10 swings (scraping motion).

In addition, the positioning motor (for example, a stepping motor) 3 is rotated forward, reversed, or stopped as necessary to move the center fulcrum 2 of the two series pantograph-shaped cross rods 1 to an arbitrary position along the spiral guide groove 5. If the other end 9 is moved to a desired position, the other end 9 can also be moved to an arbitrary position to change the injection direction of the plasto nozzle 10.

The injection range toward Plus 1 forms an area with expansion, and the position of this (i.e., the injection direction of the Plasto nozzle 10) has a tolerance, so the density of the spiral guide groove 5 that defines this positioning It is sufficient to cover the required area with a degree of roughness suitable for practical use. Note that 18 indicates a high pressure hose.

FIG. 2 shows the external appearance of the plus 1 to nozzle device assembled according to the present invention.

(Effects) 1) By providing a universal ring in the center of the Plast nozzle, the swing of the nozzle (
It can be used as a movement fulcrum for the sliding movement) and the change of the jet direction of the nozzle.

2) By using two pantograph-shaped cross rods in series, the rear end side of the blast nozzle can be easily accessed without any restrictions, even if the blast nozzle has attachments such as high pressure or hoses on the rear extension line. By holding it, the circumferential movement of the plasto nozzle was made possible.

3) Since the position on the plane is covered along the spiral guide groove, arbitrary positioning can be easily performed using one motor.

4) The spray angle (air flow containing abrasive grains) of a single blast nozzle is at most 10' or less. Therefore, by using the apparatus of the present invention, wide-band blast polishing becomes possible even in abrasive cleaning operations with short facing distances in narrow spaces or restricted areas (such as nuclear facilities).

5) Because it is small and simple and has few complicated elements, it is especially effective for work in isolated locations that does not require support equipment or personnel, such as work on nuclear reactor equipment.

[Brief explanation of drawings]

FIG. 1 shows the configuration of a jet direction control device for a swinging blast nozzle according to the present invention. FIG. 2 shows the appearance of a plasto nozzle to which the present invention is applied. In the diagram; 1. Two series pantograph-shaped cross rods. 2. Center fulcrum.
3 Positioning motor 3a Motor shaft
4 Swivel pinch arm 5 Spiral guide groove 6 One end (of the cross rod) 7 Swing motor 7a Motor shaft 8 Swivel arm 9 Other end (of the cross rod) 10 Plus 1~
Nozzle 11 Free ring 12 Circular ring 13
Vertical support shaft 14 Horizontal support shaft 15 Rotation trajectory of the rear end of the nozzle 16 Blast nozzle tip J7 Rotation trajectory of the nozzle tip 18 High pressure/hose 19 External structure consideration 2

Claims (1)

[Claims] The center fulcrums (2) of two series pantograph-shaped cross rods (1) are fitted so that they can slide along the fixed spiral guide grooves (5), and the fitted center fulcrums ( 2) is clamped and held by a rotating clamping arm (4) provided perpendicularly to the motor shaft (3a) of the positioning motor (3), which is located concentrically with the spiral guide groove (5); One end of the rod (1) is connected to another swing motor (
The motor shaft (7a) of 7) is rotatably supported at the tip of a swing arm (8) provided perpendicular to the motor shaft (7a), while the other end of the pantograph-shaped cross rod (1) is connected to its center by a flexible ring. A swinging blast nozzle jet direction control device that is pivotally supported on the rear end of a swingably held blast nozzle (10).