Small-rod-diameter long sand conveying pipe lateral sand blasting head provided with annular brush supporting mechanism

Abstract

The invention discloses a small-rod-diameter long sand conveying pipe lateral sand blasting head provided with an annular brush supporting mechanism. The small-rod-diameter lateral sand blasting head is axially installed at the front end of the long sand conveying pipe for conveying high-pressure sand flow, the long sand conveying pipe is sleeved with the annular brush supporting mechanism, and the small-rod-diameter long sand conveying pipe lateral sand blasting head provided with the annular brush supporting mechanism is simple in structure, very small in radial size and convenient to use. And a small-caliber long-pipe-hole workpiece which cannot be treated in the prior art can be subjected to sand blasting treatment.

Description

[0001] field:

[0002] The present invention discloses a side sandblasting head for a small-rod-diameter long sand conveying pipe equipped with an annular brush support mechanism. The small-rod-diameter side sandblasting head is axially installed at the front end of the long sand conveying pipe that conveys high-pressure sand flow, and the annular brush support mechanism is mounted on the long sand conveying pipe. The side sandblasting head for a small-rod-diameter long sand conveying pipe equipped with an annular brush support mechanism has a simple structure and a very small radial dimension, and is capable of sandblasting small-diameter long-tube workpieces that cannot be processed by existing technologies. The annular brush support mechanism, which is designed to prevent the side sandblasting head and the long sand conveying pipe from touching the surface of the workpiece, provides low-friction resistance movement for the side sandblasting head to rotate and move back and forth along the axis of the workpiece. The sandblasting jet ejected by the side sandblasting head can be evenly sprayed onto the inner surface of the workpiece during movement, ensuring the stability and consistency of the sandblasting effect. This technology belongs to the field of pneumatic sandblasting technology and is applied to surface engineering. Background Art

[0003] Sandblasting the interior of small boreholes in workpieces has been a major challenge in the application of sandblasting technology. Existing sandblasting technology is difficult to use for boreholes with a diameter of less than 100 mm, and achieving high-quality sandblasting on the interior walls of deeper boreholes is particularly challenging. During sandblasting of long boreholes, the sand delivery pipe and lateral blasting head must avoid contact with the wall during movement, necessitating a support mechanism that allows the lateral blasting head to enter the workpiece.

[0004] Existing support mechanisms for sandblasting the inner wall of a pipe hole include adjustable support mechanisms with gantry casters and adjustable support mechanisms with screw casters. These mechanisms use threaded adjustment to control the spread of multiple support casters. The casters are pivoted on the inner wall of the pipe hole, allowing the long sand pipe and lateral sandblasting head to be suspended near the center of the workpiece's pipe hole. The support mechanism has two functions: first, it supports the long sand pipe and lateral sandblasting head while they are suspended within the workpiece's long pipe hole, preventing them from contacting the workpiece wall and affecting the quality of the sandblasting; second, it provides stable working conditions with low friction for the rotation and movement of the long sand pipe and lateral sandblasting head during sandblasting.

[0005] Existing support mechanisms for sandblasting the inner wall of long pipe holes occupy a large radial dimension due to the structural components. This type of support mechanism, which requires the lateral sandblasting head to enter the workpiece pipe hole, is too large to be used for small-sized pipe holes. Existing lateral sandblasting heads equipped with adjustable support mechanisms are difficult to use for small pipe holes under 100 mm. Summary of the Invention

[0006] The small-diameter long sand conveying pipe lateral sandblasting head equipped with an annular brush support mechanism comprises a small-diameter long sand conveying pipe lateral sandblasting head and an annular brush support mechanism mounted thereon. The small-diameter long sand conveying pipe lateral sandblasting head is installed at the front end of a long sand conveying pipe that delivers a high-pressure sand flow. The length of the long sand conveying pipe for conveying high-pressure sand flow matches the length of the workpiece tube hole, so the small-rod diameter side sandblasting head can penetrate into the long tube hole of the workpiece of corresponding length to carry out sandblasting; the small-rod diameter side sandblasting head is composed of a boron carbide side sandblasting nozzle and a metal sandblasting nozzle mounting seat; the boron carbide sandblasting nozzle is provided with a plurality of side spray holes, which spray sandblasting jets to the side and front; the boron carbide sandblasting nozzle is coaxially sealed, bonded or assembled on the sandblasting nozzle metal mounting seat; the sandblasting nozzle metal mounting seat has one function of bonding or assembling the boron carbide side sandblasting nozzle and another function of using its port thread to be threadedly connected to the outlet end of the long sand conveying pipe; when the long sand conveying pipe and the side sandblasting head are in operation, especially when the long sand conveying pipe is long, it is difficult to avoid touching the wall of the workpiece, resulting in the adverse consequences of increased friction resistance and reduced sandblasting quality. The support mechanism adopted by the present invention is an annular brush support mechanism. The long sand conveying pipe and the lateral sandblasting head are suspended and supported by multiple groups of annular brush support mechanisms, thereby avoiding friction and contact with the wall of the workpiece; each group of annular brush support mechanisms is composed of an annular brush and a limit ring sleeved on the long sand conveying pipe; the annular brush is composed of a base ring and planted bristles thereon; the base ring is made of lightweight nylon plastic with low friction resistance; the inner hole of the base ring is slightly larger than the outer diameter of the long sand conveying pipe, so that after the annular brush is sleeved on the long sand conveying pipe, it is a so-called shaft-hole clearance fit with low resistance rotation.The planted bristles are densely planted short nylon plastic filaments that are drilled and planted perpendicular to the outer surface of the base ring and firmly bonded; the outer contour of the annular brush matches the cross-sectional shape of the workpiece tube hole, and the annular brush contacts the inner wall of the tube hole for support; at this time, the dense nylon filaments that are clustered and rooted and planted in the annular brush not only have a certain elasticity but also have extremely strong "collective anti-bending force", which can fully resist and absorb the tiny eccentric force and vibration force from the gravity of the sand conveying pipe and the rotation. If the sand conveying pipe is long, the so-called bending force can be offset by adding multiple sets of annular brush support mechanisms; the outer contour of the annular brush matches the cross-sectional shape of the workpiece tube hole, and the outer contour of the brush contacts the inner wall of the workpiece tube hole for support. Since it is a discrete point contact, and because the sand conveying pipe and the support mechanism are light in weight, the moving friction generated is small and is not enough to affect the normal motion sandblasting operation. ; The pair of limiting rings are respectively installed at both ends of the annular brush and are fixed to the long sand conveying pipe by positioning screws or mechanical clamping. When the limiting rings are installed, a movement gap is left between the two sides of the annular brush so that the sand conveying pipe can rotate freely in the center of the inner hole of the annular brush base ring, but the movement of the annular brush along the axis of the sand conveying pipe is restricted; the annular brush supporting mechanism has a group installed near the position of the small-rod diameter lateral sandblasting head, the purpose is to control the movement form of the lateral sandblasting head and better prevent the small-rod diameter lateral sandblasting head from touching the wall of the workpiece; the length of the long sand conveying pipe for conveying high-pressure sand flow is determined according to the length of the pipe hole of the sandblasting workpiece, and the number of annular brush supporting mechanisms used and the reasonable arrangement of the spacing are also increased or decreased according to the length of the pipe hole of the workpiece. The number of annular brush supporting mechanisms installed and used and the spacing setting are based on the basic principle that the long sand conveying pipe and the lateral sandblasting head do not touch the wall of the workpiece;

[0007] Beneficial effects:

[0008] A small-diameter, long-tube sandblasting head equipped with an annular brush support mechanism is characterized in that when operating within a slender tube hole, the lateral sandblasting head is not only centrally supported in the air, but also achieves low-resistance motion conditions. More importantly, the annular brush support mechanism has a significantly smaller radial dimension than the support mechanisms of the prior art. The annular brush support mechanism can accompany the small-diameter, long-tube sandblasting head into the interior of a workpiece with a small, long tube hole, and can perform sandblasting tasks on the inner wall of a small tube hole less than 100 mm. Although the annular brush support mechanism mounted on the sandblasting pipe of the small-diameter, long-tube sandblasting head does not have the ability to self-adjust its outer contour, it can pre-customize and select an annular brush of matching size according to the size of the workpiece tube hole. Moreover, since the annular brush support mechanism has no moving parts, it has a simple structure, low cost, and is easy to manufacture. In particular, the annular brush can be easily and quickly disassembled and interchanged, making it not only targeted to the workpiece hole diameter, but also universally applicable to various workpiece hole diameters. Compared with the supporting mechanism of the prior art, the present invention has a simpler process and takes less time when exchanging and disassembling the supporting mechanism.

[0009] The side blasting head for small-rod-diameter long sand conveying pipes sprays toward the side and front like the side blasting heads for the inner wall of other pipe holes. Therefore, there is no problem of the rear-mounted annular brush support mechanism being impacted by the sand flow.

[0010] When a small-diameter, long-tube sandblasting head with an annular brush support mechanism is in operation, the rotational pair exists only between the inner holes of the annular brush's nylon base ring. This fit is a clearance fit, resulting in rotational friction and wear within a reasonably controllable and applicable range. The friction and wear generated by the relative slow movement of the elastic and resilient outer contour of the brush against the workpiece's inner wall also remain within a reasonably manageable range. Externally applied rotational and translational forces accurately drive the blasting head to complete the motion blasting operation.

[0011] Other benefits include: 1) simple structure and small size, easy to manufacture, low cost of use and maintenance; 2) few parts involved, easy installation and replacement; 3) good air permeability, no impact on the normal flow of air and sandblasting operation; 4) long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0013] Attachment Figure 1 This is an axonometric view of an embodiment of a small-diameter, long-sand-tube lateral sandblasting head equipped with a set of annular brush support mechanisms;

[0014] Attachment Figure 2 This is a cross-sectional view of a small-diameter, long-tube sandblasting head equipped with two sets of annular brush support mechanisms operating in a workpiece bore.

[0015] Figure 3 It is a partially enlarged cross-sectional view of the annular brush mechanism in the installed and used state.

[0016] Among them, 1. Boron carbide side sandblasting nozzle; 2. Sandblasting nozzle metal mounting base; 3. Ring brush; 4. Limiting ring; 5. Long sand transport pipe; 6. Pipe hole workpiece. DETAILED DESCRIPTION

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0018] A small-diameter, long-sand-tube side blasting head, equipped with an annular brush support mechanism, consists of a small-diameter, long-sand-tube side blasting head and an annular brush support mechanism mounted thereon. The small-diameter, long-sand-tube side blasting head is mounted at the front end of a long sand pipe 5 that delivers a high-pressure sand stream. The length of the long sand pipe 5 matches the length of the bore of a workpiece 6, allowing the small-diameter side blasting head to penetrate deep into the long bore of the corresponding length of the workpiece 6 for sandblasting. The small-diameter side blasting head is assembled from a boron carbide side blasting nozzle 1 and a metal sandblasting nozzle mounting base 2. The boron carbide sandblasting nozzle is equipped with multiple, forward-facing spray holes (three in this embodiment). The boron carbide sandblasting nozzle 1 is coaxially mounted on the metal sandblasting nozzle mounting base 2. The metal sandblasting nozzle mounting base 2 not only mounts and secures the boron carbide side blasting nozzle, but also provides a threaded connection with the outlet end of the long sand pipe 5 via its end threads. When the long sand conveying pipe 5 and the lateral sandblasting head are working, a support mechanism needs to be installed to avoid touching the wall of the workpiece, which causes the adverse consequences of increased friction resistance and reduced sandblasting quality. The support mechanism used in the present invention is an annular brush support mechanism. The long sand conveying pipe 5 and the lateral sandblasting head are supported in the air by means of multiple groups of annular brush support mechanisms, thus avoiding frictional contact with the wall of the workpiece. Each group of annular brush support mechanisms is composed of an annular brush 3 mounted on the long sand conveying pipe 5 and a pair of limiting rings 4; the annular brush is composed of a base ring and the planted bristles thereon; the base ring is made of a lightweight nylon plastic material with low friction resistance; the inner hole of the base ring is slightly larger than the outer diameter of the long sand conveying pipe 5, so that the long sand conveying pipe 5 can rotate with low resistance after the annular brush 3 is mounted. The planted bristles are densely planted short nylon plastic filaments that are drilled and planted perpendicular to the outer surface of the base ring and firmly bonded (the thin cylinders representing the brush filaments in the attached figure are actually bundled nylon filaments that are drilled, planted and bonded); the dense nylon filaments that are rooted and planted in the bundles of annular brushes not only have a certain elasticity but also have extremely strong collective anti-bending force, and are fully capable of resisting and absorbing the bending force from the sand conveying pipe and the tiny eccentric force and vibration force caused by rotation. If the sand conveying pipe is long, the so-called bending force can be offset by adding multiple sets of annular brush support mechanisms, as shown in the attached figure. Figure 2As shown; the pair of limit rings are sleeved on the long sand conveying pipe 5, respectively located at the two ends of the annular brush 3, and fixed to the long sand conveying pipe by positioning screws or a clamping mechanism. When installed, there is a movement gap between the two sides of the annular brush, and the long sand conveying pipe 5 can rotate freely in the inner hole of the annular brush base ring, while driving the annular brush to move synchronously with the sand conveying pipe 5 back and forth; the outer contour of the annular brush 3 matches the cross-sectional shape of the workpiece 6 tube hole, and the outer contour of the brush is a discrete point contact with the inner wall of the workpiece tube hole to obtain support force. Due to the point contact, and because the sand conveying pipe and the support The support mechanism is light in weight and the moving friction generated is small, which is not enough to affect the normal sandblasting operation; the annular brush support mechanism has a group installed near the position of the small-diameter lateral sandblasting head to control the movement of the lateral sandblasting head; the length of the long sand conveying pipe 6 for conveying high-pressure sand flow, as well as the number and installation spacing of the annular brush support mechanism are determined according to the length of the pipe hole of the sandblasting workpiece. The planning and design of the length of the long sand conveying pipe 5 and the number and spacing of the annular brushes are based on the basic principle that the long sand conveying pipe 5 and the lateral sandblasting head do not touch the wall of the workpiece.

Claims

1. A small-diameter, long sand-transporting pipe lateral sandblasting head equipped with an annular brush support mechanism is characterized by The utility model is composed of a lateral sandblasting head with a small-rod-diameter and long sand conveying pipe and a ring-shaped brush supporting mechanism installed thereon.

2. The side blasting head for a small-diameter long sand transport pipe according to claim 1, characterized in that: The small-diameter long sand transport pipe side sandblasting head is composed of a long sand transport pipe 5 for transporting high-pressure sand flow and a small-diameter side sandblasting head; the small-diameter side sandblasting head is composed of a boron carbide side sandblasting nozzle 1 with several sandblasting ports facing the side and front, and a sandblasting nozzle metal mounting base 2 that assembles the sandblasting nozzles 1 together; the port thread of the sandblasting nozzle metal mounting base 2 is connected to the outlet thread of the long sand transport pipe 5.

3. The annular brush support mechanism according to claim 1, characterized in that: The annular brush support mechanism is composed of an annular brush 3 sleeved on a long sand conveying pipe 5 for conveying high-pressure sand flow and a pair of limiting rings 4 fixed to the long sand conveying pipe 5 for conveying high-pressure sand flow by positioning screws or a clamping mechanism; the annular brush 3 is composed of a base ring and planted bristles thereon; the base ring is made of nylon plastic material with low friction resistance and good toughness; the planted bristles are densely planted short nylon plastic wires that are drilled and planted in a bundle perpendicular to the outer surface of the base ring and firmly bonded; the inner hole of the base ring is slightly larger than the outer diameter of the long sand conveying pipe 5; the outer contour of the annular brush 3 matches the cross-sectional shape of the workpiece pipe hole; the pair of limiting rings 4 are fixed to the long sand conveying pipe 5 by positioning screws or a clamping mechanism and are installed on both sides of the annular brush 3 with a gap left; multiple sets of annular brush support mechanisms can be installed on a longer long sand conveying pipe 5 for conveying high-pressure sand flow, and the number and spacing of the installations are based on the principle that the sandblasting head and the long sand conveying pipe do not touch the workpiece pipe wall.

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