JPS62188674A - Workpiece holding mechanism for shot blast - Google Patents

Abstract

PURPOSE:To perform shot blasts completely without remaining any non-shot blasted part of a soft material made workpiece of a complicated shape regardless of shapes by holding the workpiece by means of the supporting bar over the end of the cylinder body provided so as to be capable of horizontal motion in the drum arranged horizontally and rotatably around the axis. CONSTITUTION:A rod 36 is stretched to project a workpiece supporting bar 28 out of a shot blast room 1, and then contracted with a workpiece 32 set to be taken into the shot blast room 1. And the drive motor of a roller 8 is operated to rotate a drum 3 and shots are blasted with a cylinder body 15, the supporting bar 28, and the workpiece 32 rotated perpendicularly. And after shot blasting the workpiece over all for a specified time, the shot blasting is stopped, and the workpiece 32 is rotated for a proper time to remove remained shots. In the next step, a position detecting sensor is made to become ON, and when the sensor detects the bracket provided to the drum 3, the drive motor stops due to weight inbalance, and the workpiece 32 is taken out of the shot blast room 1 by stretching the rod 36.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention has a cavity inside, such as an automobile engine's intensity manifold, and is made of a soft material such as aluminum, and is free from scratches. Regarding shot blasting equipment that polishes the surface of products that are prone to scratches and dents,
More specifically, the present invention relates to a product holding mechanism in the device.

(Prior Art) Conventionally, when projecting and polishing the above-mentioned products, single-piece processing is performed, and a shot hanger blasting device is often used. In other words, the product is suspended from a hook and rotated horizontally to project shots evenly around the product.

However, in this method, a large amount of short remains in the cavity of the product, so a separate work for removing the short is required. In addition, a cage type shot blasting device is sometimes used to polish the above-mentioned products (for example, the
Publication No. 2507). In other words, the product is inserted into a cage made up of several bars arranged in a cylindrical shape at appropriate intervals, with rings connected to both ends, and the cage is rotated vertically. However, the above method includes (1)
The part of the product that will be in the shadow of the bar is not polished enough (2
) Since cages are made to suit individual products, it is necessary to prepare a cage that matches the shape of the product each time the shape of the product changes. (3) Since the shot is also projected onto the rotating drive part of the cage, (Objective of the Invention) The present invention has been made to overcome the above-mentioned problems in the prior art. Another object of the present invention is to provide a novel product holding mechanism that can continuously and automatically perform the work of cleaning a product and the work of transporting the product in and out of a cleaning room.

(More of the invention) Hereinafter, the configuration of the present invention will be explained in detail based on examples. In Figs. 1 to 3, (1) is a cleaning chamber of a shot blasting device; A centrifugal projection device (not shown) is attached to the negative side wall of (1) for projecting shots inward. A loading/unloading port (not shown) for the product to be polished is provided on the right side wall of the cleaning room (1) when facing the drawing, and a drum (not shown) of the product holding mechanism (2), which will be described later, is provided on the left side wall. 3) Opening into which the tip can be inserted (4
) is provided. A product holding mechanism (2) of the present invention is disposed adjacent to the left side wall of the cleaning chamber (1).

In the mechanism (2), (3) is a drum having two annular rails (5) (5) attached to the outer peripheral wall;
3) is a pair of rollers (8) (8) that are rotatably mounted on a frame (6) via bearings (7) (7).
It is horizontally and rotatably mounted on the rails (5) (5).

One of the rollers (8) (8) is connected to a motor (not shown), and the drum (3) is driven by the motor.
) rotates forward in the direction of the arrow in FIG.

As shown in FIG. 2, unbalanced weights (9) are fixed to appropriate locations on the outer peripheral wall of the drum (3), and after the drum (3) stops rotating in the normal direction, the weights (9) It is designed to rotate in the opposite direction.

Further, a bracket (]0) for rotational positioning is fixed to an appropriate location on the outer circumferential wall of the drum (3), and a claw (]0) corresponding to the bracket (10) is attached to a lower position of the drum (3). 11) is provided, and when the drum (3) rotates in reverse, the pawl engages with the bracket (10) and stops the rotation of the drum (3). , Two position detection brackets (12) and (13) are fixed to the outer circumferential wall of the drum (3) at positions corresponding to the unbalanced weights (9) in series in the rotational direction. On the side of the drum (3) are the bras and soto (1
2) A position detection sensor (14) consisting of a proximity switch is disposed facing the rotating orbit (13).

The base end side of the drum (3) is open, and the distal end side is open.
A cylindrical body (15), which will be described later, is closed at its center by a lid member (17) having a penetrable opening (16). The tip of the drum (3) passes through the opening (4) of the cleaning chamber (1) and is inserted into the cleaning chamber (1) by a certain distance. The connection between the opening (4) of the cleaning chamber (1) and the drum (3) is sealed off from the outside by a labyrinth seal (18). That is, the drum (3) is rotatable without contacting the opening (4) of the grinding chamber (1), and the shots in the grinding chamber (1) are directed outside from the opening (4). is prevented from jumping out. Also(
19) is a rubber seal, and the labyrinth seal (19) is a rubber seal.
8) is closed off.

Inside the drum (3), a cylindrical body (15) has its axis aligned with the axis of the drum (3), and its base end faces near the base opening of the drum (3). The distal end portion is disposed so as to slightly protrude from the opening (16) of the lid member (17).

Furthermore, a pair of guide rods (21) (21) are arranged in the drum (3) in parallel with the cylindrical body (15) and at symmetrical positions with the cylindrical body (15) in between. , both ends of the guide rod (2) (21) are connected to two pairs of brackets (22) (22) and a frame (2).
3) It is fixed to both ends of the inner wall of the drum (3) via (23).

There are brackets 1-1 on both sides of the cylindrical body (3) near the base end.
(24) A pair of guide tubes (26) via (25)
(26) is attached, and the guide tube (26)
(26) is slidably fitted into the guide rod (21) (21).

A disk (27) is fixed to the tip of the cylindrical body (3). The disk (27) and the opening (1) of the lid member (17)
6) is also isolated from the cleaning chamber (1) by a labyrinth seal (28). That is, the disk (
27) is horizontally movable without coming into contact with the lid member (17), and is capable of moving horizontally without coming into contact with the lid member (17).
-7 is prevented from entering into the drum (3) through the opening (16).

There are three product holding rods (28) on the front of the disk (27).
(29) (31) are attached parallel to the axis of the drum (3) and spaced apart from each other by a predetermined distance;
The product to be processed (32) is held by the holding rods (28), (29), and (31). In the embodiment, one of the holding rods (28), (29), and (31) is inserted into and engaged with the through hole (33) of the product (32).

The holding rods (28), (29), and (31) are fixed by inserting their base ends into elongated through holes (not shown) drilled in the disc (27). Therefore, the mounting position can be adjusted depending on the shape of the product to be processed (32). Note that (33) is a support member for the holding rod (28).

A cylinder (3) facing right is located to the left of the drum (3).
4) is fixedly mounted on the pedestal (6) via a bracket (35), and the axis of the cylinder (34) and the axis of the drum (3) are made to coincide. The tip of the piston rod (36) of the cylinder (34) is fixed to the base end of the cylindrical body (15) via a rotary joint (37), so that the cylindrical body (15) is connected to the drum (
3), and can reciprocate toward the cleaning chamber (1) along the axis of the drum (3) by the expansion and contraction of the piston rod (36). Note that when the piston rod (36) is extended to the stroke end, the product holding rods (28) (29) (
31) is designed to protrude outward from the product loading/unloading entrance of the cleaning chamber (1).

(Function) In the cylinder blasting device configured as described above, first, the piston rod (36) of the cylinder (34) is
The product holding rods (28) (29) (
31) to protrude out of the cleaning chamber (1). Next, the holding rod (
28) (29) When the product to be polished (32) is set in (31) and the piston rod (36) is retracted, the 76 products (32) are taken into the cleaning chamber (1). Thereafter, when the drive motor of the upper roller (8) is operated with the entrance/exit of the polishing chamber (1) closed, the drum (3) rotates, and the cylindrical body (15) and the product holding rod (28) are rotated.
) (29) (31) and the product (32) are in the drum (
3) and rotates vertically. When a shot is projected from a centrifugal projection device (not shown) in this state, the shot thoroughly (grinds) the surrounding area of the product (32). After a predetermined period of time has elapsed, the polishing work is stopped, and time, only the product (32) is vertically rotated.
2) The shot remaining in the cavity falls and is removed. Thereafter, when the position detection sensor (14) is turned on, when one of the position detection brackets (12) passes in front of the sensor (14), the roller is activated by a signal from the sensor (14). The drive motor (8) stops operating.

The drum (3) continues to rotate forward due to inertia, but after the other position detection bracket (13) passes in front of the sensor (14), the unbalanced weight (9
) is such that the weight of the drum (3) overcomes the rotational moment of the drum (3), so that the drum (3) begins to rotate in reverse. The rotation of the drum (3) eventually stops when the rotation positioning bracket (10) engages with the pawl (11), but at this time, the other position detection bracket (13) is connected to the sensor ( As a result, a signal is emitted from the sensor (14) and the entrance/exit of the cleaning chamber (1) is automatically opened (both of the cylinders (34) Piston rod (36)
is extended and the product (32) is held by the product holding rod (28) (
29) It is carried out of the cleaning room (1) via (31). Here, the product (32) is held by the rods (28) (29)
(31), and insert a new product (32) into the holding rod (
28) (29) Set to (31).

The above operations constitute one cycle, and the cycles are repeated thereafter.

(Effects of the Invention) As is clear from the above description, the present invention is useful for polishing products with complex shapes and soft materials (which require single-piece processing) using a shot blasting device. It is held by a minimum number of holding rods and rotated vertically, thereby projecting shots evenly around the product.Therefore, like a shot hanger blasting device, a large amount of shot can be thrown into the cavity of the product. There is no stagnation, and there is no need for a separate process for removing sand.In addition, compared to cage-type shot blasting equipment, (1) there is no large amount of unpolished parts left on the surface of the product; ) Changes in the shape of the product can be easily accommodated by adjusting the mounting position of the holding rod, and (3) Maintenance is kept to a minimum because shots are not projected onto the rotating drive part of the product holding rod. Further, the invention not only allows the product to be rotated vertically, but also to be moved horizontally, making it easier to transport the product into and out of the cleaning room.

Moreover, since these tasks can be performed continuously and automatically, work efficiency is greatly improved.

[Brief explanation of drawings]

The drawings show the product holding mechanism according to the present invention, and FIG. 1 is a longitudinal sectional front view (when the drum is rotating), and FIG. 2 is a view taken from A--A in FIG.
3 is a sectional view taken along line A (when the drum is stationary), and FIG. 3 is a sectional view taken along line BB in FIG. 1. (1): Grinding room (3) Nidrum (12) (
13) : Position detection bracket (14) : Position detection sensor (15) : Cylindrical body (21) Ni guide rod (26) Ni guide cylinder (27) : Disc
(28) (29) (31) : Product holding rod (32
) :Product (34) Nijilinda (37)
: Rotating joint

Claims (1)

[Claims] A drum (3) rotatable around an axis is arranged horizontally, and the tip of the drum (3) is connected to the cleaning chamber (1) via a labyrinth seal (18) that rotates and maintains engagement. ), and a cylindrical body (15) is arranged concentrically within the drum (3) with its tip slightly protruding from the tip of the drum (3), and the cylindrical body (15) is inserted into the drum (3). A labyrinth seal (27) is attached to the tip of the drum (27), and the disk (27) and the tip of the drum (3) are engaged and disengaged by horizontal movement.
28), and a plurality of product holding rods (28), (29), and (31) are attached to the front surface of the disk (27) in parallel to the axis of the cylinder (15), and the cylinder body (15)
A product holding mechanism for a shot blasting apparatus, characterized in that the product holding mechanism is rotatable integrally with the drum (3) and is movable back and forth along the axis toward the polishing chamber (1).