Flexible rotary sand blasting head assembly suitable for sand blasting of inner wall of slender elbow

Abstract

The invention discloses a flexible rotary sandblasting head assembly suitable for sandblasting of the inner wall of a slender elbow, and the flexible rotary sandblasting head assembly is called a flexible rotary sandblasting head assembly for short. The device consists of a lateral sand blasting head 1, a plurality of groups of annular brush mechanism supports 2 and a flexible high-pressure sand conveying pipe 2, wherein the input end of the flexible high-pressure sand conveying pipe 2 is connected with a sand outlet of a press-in type sand blasting machine through a movable joint special for the sand blasting pipe, or the input end of the flexible high-pressure sand conveying pipe 2 is connected with a high-pressure sand flow output port of an automatic rotary sand blasting machine head driven pneumatically or electrically through the movable joint special for the sand blasting pipe. The flexible rotary sand blasting head assembly is driven by a manual or automatic movement mechanism to rotate and move back and forth to complete sand blasting of the inner wall of the bent pipe. The sand blasting machine not only solves the sand blasting problem of the inner wall of a small-caliber deep pipe hole, but also can further implement sand blasting in a thin bent pipe workpiece.

Description

field:

[0001] A flexible rotary sandblasting head assembly, also known as the flexible rotary sandblasting head assembly, is suitable for sandblasting the inner walls of slender curved pipes. It not only solves the problem of sandblasting the inner walls of small-diameter, long pipe holes, but also allows for sandblasting inside thin curved pipes. This belongs to the field of pneumatic sandblasting technology and is used in surface engineering applications. Background technology:

[0002] Sandblasting the inner walls of long pipes with apertures less than 100mm, or even slender curved pipes, presents a technical challenge and a potential application gap. Existing sandblasting technology can only be used on the inner walls of larger straight pipes or the inner walls of curved pipes. Due to the limited reach of the sandblasting head, most curved pipes can only be treated near the inner surface of the pipe opening. There is currently no effective sandblasting method for the inner walls of slender curved pipes.

[0003] The existing technology can only achieve sandblasting on the inner wall of pipe holes larger than 100mm. The supporting mechanism used is an adjustable caster mechanism. It is this adjustable caster mechanism that occupies a large radial space size, limiting the sandblasting head from entering smaller workpiece pipe holes, causing sandblasting application problems for workpiece pipe holes smaller than 100mm. It is even more difficult to implement sandblasting inside slender curved pipes.

[0004] To address the problem of sandblasting the inner walls of small-diameter, long pipes, a small-diameter side-mounted sandblasting head and a ring-shaped brush support mechanism were developed. While this solved the problem of sandblasting the inner walls of small-diameter pipes, it still couldn't directly address the problem of sandblasting the inner walls of slender, curved pipes less than 100 mm. Summary of the invention:

[0005] The present invention proposes a flexible rotating sandblasting head assembly suitable for sandblasting the inner wall of a slender curved pipe. The assembly can be manually operated or combined with an automated motion mechanism to implement sandblasting on the inner wall of a slender pipe hole. The assembly is characterized in that the flexible rotating sandblasting head assembly consists of a small-diameter lateral sandblasting head, a front-end guide annular brush support mechanism, a flexible high-pressure sand conveying pipe, and the like. Several groups of brush support mechanisms fixedly installed on the sand conveying pipe extend into the interior of the bent pipe workpiece together with the flexible high-pressure sand conveying pipe; the input end of the flexible high-pressure sand conveying pipe is connected to the high-pressure sand flow output port of the press-in sand blasting machine or the high-pressure sand flow outlet of the automated rotating head through a special sandblasting interface; the outlet end of the flexible high-pressure sand conveying pipe is sealed with the small-rod diameter lateral sandblasting head assembly through a threaded adapter, and the several groups of annular brush support mechanisms, each group of annular brush support mechanisms is composed of an annular brush sleeved on the sand conveying pipe and a pair of limiting rings sleeved and fixed on the flexible high-pressure sand conveying pipe; the annular brush is firmly bonded by a nylon plastic base ring and short nylon wires that are densely planted and drilled perpendicular to the outer surface of the base ring; the inner hole diameter of the base ring is slightly larger than the outer diameter of the flexible high-pressure sand conveying pipe to which it belongs The outer contour of the brush matches the inner diameter of the workpiece tube hole. The limiting rings are installed on both sides of the annular brush with a gap, and are fixed to the flexible high-pressure sand conveying pipe with positioning screws or a clamping mechanism. The multiple annular brush support mechanisms follow the flexible high-pressure sand conveying pipe and penetrate into the workpiece's slender curved pipe. Their function is to suspend the flexible high-pressure sand conveying pipe and the small-diameter lateral sandblasting head in front of it to avoid contact with the workpiece wall, thereby ensuring the quality of sandblasting while reducing rotational resistance. The small-diameter lateral sandblasting head consists of a boron carbide nozzle with multiple spray holes facing the side and front, and a threaded metal mounting base bonded or assembled thereto. The metal mounting base is responsible for connecting to the dedicated output interface of the flexible high-pressure sand conveying pipe and its function is to spray the sandblasting jet toward the side and front of the inner wall of the workpiece tube hole. A manual or automated motion mechanism applies rotational and linear motion forces to the outside of the workpiece, and the small-diameter lateral sandblasting head completes uniform scanning sandblasting of the inner wall of the slender curved pipe.

[0006] Beneficial effects:

[0007] Existing sandblasting technology, including sandblasting heads and sand delivery pipes with traditional adjustable support mechanisms, cannot penetrate into the interior of slender pipe-hole workpieces, creating a gap in the application of sandblasting the inner wall of slender pipe holes. The flexible rotating sandblasting head assembly of the present invention not only solves the problem of sandblasting slender curved pipes, but also has the following beneficial effects:

[0008] When the flexible rotating sandblasting head assembly equipped with an annular brush support mechanism is working, the lateral sandblasting head and the sand conveying pipe are not only supported in the air, but also obtain low-resistance movement conditions. More importantly, the radial size of the annular brush support mechanism is greatly reduced compared with the support mechanism of the existing technology. The annular brush support mechanism can follow the flexible high-pressure sand conveying pipe into the interior of a slender curved pipe less than 100 mm to perform the sandblasting task on the inner wall of the hole.

[0009] The flexible high-pressure sand conveying pipe is made of a rubber-plastic composite material that can withstand high pressure and has a high torque resistance. The torque applied by manual operation or automated equipment can be accurately transmitted to the small-diameter lateral sandblasting head in front. In addition, the multiple groups of annular brush support mechanisms installed at reasonable intervals can completely overcome the twisting and knotting behavior of the flexible sand conveying pipe.

[0010] While the annular brush support mechanism lacks the ability to self-adjust its outer contour, it can pre-customize and select an annular brush of matching size based on the size of the workpiece bore. Furthermore, due to its simple structure, low cost, and ease of manufacture, the annular brush support mechanism is particularly convenient and quick to disassemble and interchange. This allows for not only targeted aperture adjustment but also universal compatibility with various apertures through interchangeable installation of annular brush support mechanisms with different outer diameters. Compared to existing support mechanisms, the present invention simplifies and shortens the process of interchangeability and disassembly.

[0011] The flexible rotary sandblasting head assembly, like other side sandblasting heads for the inner wall of a pipe hole, sprays toward the side and front, so there is no problem of the rear-mounted annular brush support mechanism being impacted by the sand flow.

[0012] There is a clearance fit between the annular brush and the sand conveying pipe, and the rotational resistance is small. The force of the external driving rotation is sufficient to overcome the rotational resistance of the clearance fit.

[0013] During operation of a flexible rotary sandblasting head assembly equipped with a ring-shaped brush support mechanism, the back-and-forth movement of the sand conveying tube generates friction only between the outer contour of the ring-shaped brush nylon filaments and the inner wall of the workpiece. Since only the tips of several filaments of the elastic and resilient brush outer contour contact the wall, the total contact area is small. Due to the limited diameter and weight of the sand conveying tube used in thin curved pipes, the friction generated by its back-and-forth movement is minimal. The back-and-forth motion force applied from the outside of the workpiece is sufficient to overcome the frictional resistance between the ring-shaped brush and the wall.

[0014] 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. Description of the drawings:

[0015] In order to more clearly illustrate the technical solutions of 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.

[0016] Figure 1This is a cross-sectional demonstration diagram of the flexible rotary sandblasting head assembly operating in a bent pipe workpiece;

[0017] Figure 2 This is an axonometric partial enlarged view of the flexible rotary sandblasting head assembly with a three-hole lateral sandblasting head and an annular brush support mechanism installed on the head;

[0018] Figure 3 It is a cross-sectional schematic diagram of the annular brush support mechanism in the flexible rotary sandblasting head assembly working in the workpiece;

[0019] Among them, 1. Small rod diameter side sandblasting head assembly; 1.1. Boron carbide side sandblasting nozzle; 1.2. Metal threaded port mounting seat; 2. Annular brush support mechanism; 2.1. Annular brush; 2.2. Limiting ring; 3. Flexible high-pressure sand conveying pipe; 4. Slender curved pipe workpiece. Specific implementation method:

[0020] 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 part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Reference Figure 1-3The present invention proposes a flexible rotary sandblasting head assembly suitable for sandblasting the inner wall of a slender curved pipe, comprising a small-diameter lateral sandblasting head 1, an annular brush supporting mechanism 2 and a flexible high-pressure sand conveying pipe 3. The small-diameter side sandblasting head 1 is composed of a boron carbide side sandblasting head 1.1 with multiple sandblasting holes facing the side and front (a three-hole side sandblasting head is used in this embodiment) and a metal mounting base 1.2 with a port thread bonded thereto or assembled thereon; the port thread of the small-diameter side sandblasting head 1 is sealed and docked with the thread of the dedicated conversion interface of the flexible high-pressure sand conveying pipe 3, which is responsible for spraying a sandblasting jet with a lateral angle to the side and front; the several groups of annular brush support mechanisms 2 are fixed on the flexible high-pressure sand conveying pipe 3, and each group of annular brush support mechanisms 2 is composed of annular brushes 2.1 and a pair of limiting rings 2.2; the pair of limiting rings 2.2 are installed on both sides of the annular brush 2.1 and are fixed on the flexible high-pressure sand conveying pipe 3 at appropriate positions selected by positioning screws or a clamping mechanism, leaving gaps at both ends of the annular brush 2.1; the annular brush 2.1 is composed of a nylon plastic base ring and a vertical The drilled holes perpendicular to the outer surface of the base ring are made of densely planted and bonded nylon short fibers. The inner hole of the base ring is slightly larger than the outer diameter of the flexible high-pressure sand conveying pipe 3, and the outer contour of the annular brush 2.1 matches the aperture of the workpiece 4; the function of the annular brush support mechanism 2 is to allow the annular brush support mechanism 2 to follow the deformation of the flexible high-pressure sand conveying pipe 3 and the slender curved pipe 4 entering and exiting the workpiece, while the flexible high-pressure sand conveying pipe 3 can rotate with low resistance; the flexible high-pressure sand conveying pipe 3 is a section of sandblasting special sandblasting hose, and the inlet end is sealedly connected to the high-pressure sand flow output port of the press-in sandblasting machine or the high-pressure sand flow rotation and movement output port of the power-driven motion mechanism through a special sandblasting interface; the multiple groups of annular brush support mechanisms 2 determine the number of uses and installation positions according to the actual situation of the slender curved pipe 4 of the workpiece, with the principle that the flexible high-pressure sand conveying pipe 3 and the small-rod diameter lateral sandblasting head 1 do not touch the workpiece pipe wall.

Claims

1. A flexible rotary sandblasting head assembly suitable for sandblasting the inner wall of a slender curved pipe, characterized by: The flexible rotary sandblasting head assembly suitable for sandblasting the inner wall of a slender curved pipe consists of a small-diameter lateral sandblasting head 1, several groups of annular brush support mechanisms 2 and a flexible high-pressure sand conveying pipe 3.

2. The flexible rotary sandblasting head assembly according to claim 1, characterized in that: The small-rod diameter side sandblasting head 1 consists of a boron carbide side sandblasting head 1.1 (a three-hole side sandblasting head is used in this embodiment) having multiple sandblasting holes facing the side and front, and a metal mounting base 1.2 with port threads bonded or assembled thereon; the port threads of the small-rod diameter side sandblasting head 1 are sealed and docked with the threads of the dedicated conversion interface of the flexible high-pressure sand conveying pipe 3, and are responsible for spraying a sandblasting jet with a lateral angle toward the side and front.

3. The flexible rotary sandblasting head assembly according to claim 1, characterized in that: The several groups of annular brush support mechanisms 2 are set and fixed on the flexible high-pressure sand conveying pipe 3, and each group of annular brush support mechanisms 2 consists of an annular brush 2.1 and a pair of limiting rings 2.2; the pair of limiting rings 2.2 are installed on both sides of the annular brush 2.1 and are fixed on the flexible high-pressure sand conveying pipe 3 at appropriate positions by positioning screws or a clamping mechanism, leaving gaps at both ends of the annular brush 2.1; the annular brush 2.1 is made of a nylon plastic base ring and nylon short filaments that are densely planted and bonded with a bunch of drilled holes perpendicular to the outer surface of the base ring. The inner hole diameter of the base ring is slightly larger than the outer diameter of the flexible high-pressure sand conveying pipe 3, and the outer contour of the annular brush 2.1 matches the hole diameter of the workpiece 4. Matching; the function of the annular brush supporting mechanism 2 is to allow the annular brush supporting mechanism 2 to follow the deformation of the flexible high-pressure sand conveying pipe 3 and the slender curved pipe 4 that enters and exits the workpiece, and at the same time, the flexible high-pressure sand conveying pipe 3 can rotate with low resistance; the flexible high-pressure sand conveying pipe 3 is a section of sandblasting hose specially used for sandblasting, and the inlet end is sealedly connected to the high-pressure sand flow output port of the press-in sandblasting machine or the rotating and moving high-pressure sand flow motion output port of the power-driven motion mechanism through a special sandblasting interface; the number and installation position of the multiple groups of annular brush supporting mechanisms 2 are determined according to the actual situation of the slender curved pipe 4 of the workpiece, with the principle that the flexible high-pressure sand conveying pipe 3 and the small-rod diameter lateral sandblasting head 1 do not touch the workpiece pipe wall.

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