Annular sticky wool top supporting ring applied to sandblasting of inner wall of slender pipe hole

Abstract

The invention discloses an annular sticky wool top supporting ring mechanism applied to sand blasting of the inner wall of a slender pipe hole. The annular sticky wool top supporting ring mechanism is suitable for sand blasting of the inner wall of the slender pipe hole with the hole diameter smaller than 25 mm. The sand blasting head supporting mechanism solves the problem that a suitable sand blasting head supporting mechanism does not exist when sand blasting is carried out on the inner wall of a small pipe hole.

Description

[0001] TECHNICAL FIELD

[0002] Supporting mechanism for keeping the sandblasting head suspended and rotating and moving freely in the sandblasting process of the inner wall of pipe hole workpiece is an essential auxiliary mechanism for maintaining the smooth progress of sandblasting operation and ensuring the quality of sandblasting. A soft supporting mechanism with thinner thickness and smaller radial size is proposed for sandblasting treatment of thin tube hole workpieces with hole diameter less than 25 mm, namely ring adhesive hair strip supporting ring mechanism. The technology belongs to the field of sandblasting and is applied to surface engineering. BACKGROUND

[0003] More and more requirements for surface preparation such as paint and rust removal, surface cleaning and achieving the set roughness value are applied to workpieces before coating, spraying, electroplating and lining the inner wall of pipe hole workpieces. However, there are still difficulties in existing sandblasting technology for high-quality sandblasting treatment of thin tube hole workpieces with hole diameter less than 25 mm. The difficulties are reflected in the miniaturization of the sandblasting head, especially the radial size, and the miniaturization of the radial size of the sandblasting head supporting mechanism. Small rod diameter lateral sandblasting head realizes the miniaturization of the sandblasting head, and the minimum radial size has reached less than 10 mm. The small rod diameter sandblasting head is composed of a lateral sandblasting nozzle made of wear-resistant material and a long sand conveying pipe with the same outer diameter. The small rod diameter sandblasting head needs a supporting mechanism to follow it into the workpiece to assist the so-called dynamic sandblasting process in the process of rotating and moving forward and backward in the interior of the thin tube hole workpiece. The role of the supporting mechanism is: 1) to realize isolation between the sandblasting head and the workpiece surface to avoid mutual contact between them, and 2) to provide low resistance movement function for dynamic sandblasting driven by artificial or automation.

[0004] The existing supporting mechanism includes a radial size adjustable supporting mechanism and a ring brush supporting mechanism of a clearance rotary pair. The radial size adjustable supporting mechanism adjusts the opening distance of several supporting casters distributed in the circumferential direction by relying on a threaded pair. The casters are supported in contact with the wall surface, and the sandblasting mechanism completes the sandblasting operation in the suspended rotation and movement. It is applied to sandblasting of the inner wall of large tube holes with hole diameter above 100 mm. Since the adjustable caster supporting mechanism occupies a large radial size itself, it affects the passability of the sandblasting head installed with such a supporting mechanism, and is not suitable for sandblasting of smaller workpiece tube holes with hole diameter less than 100 mm; the ring brush supporting mechanism of the clearance rotary pair occupies a relatively small radial size, and the passability is improved, which is suitable for sandblasting of the inner wall of smaller workpiece tube holes, but the outer contour of the ring brush supporting mechanism is difficult to be less than 25 mm. A new type of supporting mechanism is still needed for sandblasting of the inner wall of thin tube hole workpieces with hole diameter less than 25 mm. SUMMARY

[0005] The application provides a ring-adhesive-fuzz-strip supporting ring mechanism applied to sand blasting of an inner wall of an elongated pipe hole, and aims at implementing high-quality motion sand blasting treatment of a small rod-diameter sand blasting head with the aid of the supporting mechanism when the inner wall sand blasting operation is implemented on a thin pipe hole workpiece with a hole diameter of less than 25 mm.

[0006] The ring-adhesive-fuzz-strip supporting ring of the small rod-diameter sand blasting head for implementing the inner wall sand blasting operation on the thin pipe hole workpiece with the hole diameter of less than 25 mm is characterized in that the ring-adhesive-fuzz-strip supporting ring is formed by gluing and fixing a fuzz-strip supporting ring material and an outer wall of an elongated sand conveying pipe of the small rod-diameter lateral sand blasting head, and a smooth outer contour formed by the ring-adhesive-fuzz-strip supporting ring and a wall surface of the small pipe hole workpiece form a low-resistance friction motion pair; the material of the ring-adhesive-fuzz-strip supporting ring includes adhesive fuzz strips or paper films and plastic films with back glue, and is collectively referred to as a ring-adhesive-fuzz-strip; the small rod-diameter sand blasting head is composed of a wear-resistant material sand blasting nozzle with a lateral sand blasting hole and an elongated sand conveying pipe fixedly connected to the nozzle; the outer contour of the ring-adhesive-fuzz-strip supporting ring is slightly smaller than the inner diameter of the thin pipe hole workpiece to reduce the motion friction resistance; the outer contour of the ring-adhesive-fuzz-strip contacts the inner wall of the pipe hole of the workpiece and plays a role of isolation between the sand blasting head and the inner wall of the workpiece, so that the small rod-diameter sand blasting head is not in contact with the workpiece, the quality of the sand blasting surface is ensured, and the motion resistance in the dynamic sand blasting is reduced; the material of the ring-adhesive-fuzz-strip is selected from smooth paper films and plastic films with back glue, and sealed fuzz strips glued to the outer wall of the sand conveying pipe of the sand blasting head; the materials in contact with the wall surface of the workpiece are selected from materials with small friction coefficients; the outer contour of the ring-adhesive-fuzz-strip is slightly smaller than the inner diameter of the pipe hole of the workpiece, so as to reduce the contact area and the friction resistance of the motion pair; since the sand blasting head working in the small-diameter pipe hole is light in weight, the size of the ring-adhesive-fuzz-strip installed on the sand blasting head is also small, and therefore the motion pair of the ring-adhesive-fuzz-strip and the wall surface still belongs to a low-resistance friction pair, and can meet the requirements of free rotation and movement of the small rod-diameter sand blasting head under the driving of artificial or automatic power equipment.

[0007] Beneficial effects:

[0008] The ring-adhesive-fuzz-strip supporting ring applied to the inner wall sand blasting of the thin pipe hole solves the supporting problem of the pipe hole workpiece with a hole diameter of less than 25 mm in sand blasting. Under the supporting action of the ring-adhesive-fuzz-strip supporting ring, the sand blasting nozzle can keep the freedom of free rotation and movement in the pipe hole of the workpiece, avoids the physical contact of the sand blasting nozzle with the wall surface of the workpiece, and reduces the motion resistance.

[0009] Compared with the adjustable supporting mechanism of the prior art and the ring-shaped brush supporting mechanism of the prior application, the thickness of the ring-adhesive-fuzz-strip is smaller. The ring-adhesive-fuzz-strip can assist the small rod-diameter lateral sand blasting head to enter the inside of the pipe hole workpiece with a hole diameter of less than 25 mm to implement the sand blasting operation.

[0010] The material of the ring-adhesive-fuzz-strip is a soft material, and the wall surface of the workpiece will not be scratched in the contact and movement friction with the surface of the ultra-thin pipe hole workpiece.

[0011] The movement friction resistance of the movement friction pair formed by the outer profile of the ring adhesive hair strip and the inner wall of the workpiece tube hole can be controlled within a very small range, which will not affect the requirement of low movement resistance for the dynamic sandblasting process.

[0012] The ring adhesive hair strip support ring can be repaired and replaced at any time, which can ensure the normal operation of the sandblasting equipment.

[0013] The process of the ring adhesive hair strip is extremely simple, the material is easy to obtain, and the price is low. Even if there is wear and tear, the adhesive material can be added in time. It has good applicability, maintainability and reliability.

[0014] The outer profile of the ring adhesive hair strip is slightly smaller than the hole diameter of the workpiece, which aims to reduce the contact area of the movement pair and the resistance generated by the contact area, which is one of the measures to reduce the movement friction resistance.

[0015] Although the small rod diameter lateral sandblasting head of the ring adhesive hair strip cannot ensure complete centering work, it does not affect the sandblasting quality and consistency. Sandblasting belongs to fluid processing, and the influence of the spraying distance on the sandblasting quality is not sensitive. In the internal sandblasting operation of the small tube hole, the small difference in sandblasting distance does not affect the uniformity of the processing.

[0016] All the sandblasting jets of the inner wall sandblasting head are sprayed to the side front, so there is no problem of sandblasting jet flushing the support mechanism installed on the rear of the sand conveying pipe.

[0017] Other beneficial effects include simple structure and installation process, easy to obtain raw materials, low cost, on-site processing, easy to use, maintain and update, etc. BRIEF DESCRIPTION OF DRAWINGS

[0018] The drawing is an embodiment of the ring adhesive hair strip support mechanism auxiliary small rod diameter sandblasting head for the sandblasting operation in the elongated tube hole. Figure 1 is a position relationship cross-sectional view of the small rod diameter sandblasting head installed with two ring adhesive hair strip support ring mechanisms before entering the small tube hole workpiece; Figure 2 is a position relationship view of the small rod diameter sandblasting head installed with two ring adhesive hair strip support mechanisms after entering the small tube hole workpiece. In the figure:

[0019] 1——tube hole workpiece

[0020] 2——small rod diameter lateral sandblasting nozzle

[0021] 3——ring adhesive hair strip support ring

[0022] 4——sand conveying pipe

[0023] The multi-ring adhesive strip support ring 3 with slightly smaller outer contour than the inner diameter of the fine tube hole workpiece 1 is fixed on the outer wall of the small-diameter elongated sand conveying pipe 4 of the small-diameter lateral sand blasting head by glue or self-adhesive backing. One of the multi-ring adhesive strip support rings 3 is installed close to the small-diameter lateral sand blasting nozzle 2. The small-diameter lateral sand blasting head is composed of a small-diameter lateral sand blasting nozzle 2 made of wear-resistant material and an elongated sand conveying pipe 4 with the same outer diameter. The small-diameter lateral sand blasting head is driven by the rotating and forward and backward moving forces applied to it to move dynamically to complete the sand blasting work on the whole wall surface. The outer contour of the multi-ring adhesive strip support ring 3 is slightly smaller than the inner diameter of the fine tube hole workpiece 1, reducing the contact area and the frictional resistance of movement. The multi-ring adhesive strip 3 forms an isolation between the small-diameter sand blasting head and the wall surface of the fine tube hole workpiece 1, avoiding the collision and friction between the suspended small-diameter sand blasting head and the wall surface of the fine tube hole workpiece 1, ensuring the sand blasting quality, avoiding the movement resistance, and eliminating the scratching of the workpiece surface. The material of the multi-ring adhesive strip is selected from smooth paper film, plastic film, and adhesive-backed or glued adhesive strip for wool strips. The materials that come into contact with the workpiece wall surface are selected from materials with small friction coefficient and smooth surface.

Claims

1. A ring-bonded bristle support ring for sandblasting the inner wall of a slender pipe, characterized in that... Multiple ring-bonded bristle support rings 3 are bonded and fixed to the outer wall of the slender sand delivery pipe 4 of the small-diameter lateral sandblasting head using adhesive or self-adhesive backing. One of the ring-bonded bristle support rings 3 is installed close to the small-diameter lateral sandblasting nozzle 2. The small-diameter lateral sandblasting head is composed of a wear-resistant small-diameter lateral sandblasting nozzle 1 and a slender sand delivery pipe 4 of the same outer diameter bonded and fixed together. The small-diameter lateral sandblasting head with the ring-bonded bristle support ring 3 penetrates into the thin tube hole of the workpiece 1 and is subjected to rotation. Driven by the force of forward and backward movement, the dynamic motion is used to complete the sandblasting operation of the entire wall surface; the outer contour of the ring-bonded bristle support ring 3 is slightly smaller than the inner diameter of the thin-tube workpiece 1; the ring-bonded bristle 3 forms an isolation between the small-diameter sandblasting head and the wall surface of the thin-tube workpiece 1; the outer contour material of the ring-bonded bristle material is selected from smooth paper film, plastic film, and bristles are bonded to the outer wall of the sand conveying pipe 4 with self-adhesive or glue, and the materials that come into contact with the wall surface of the workpiece 1 are selected from smooth materials with a low coefficient of friction.

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