A kind of pipe diameter inside shot blasting device centralizer

Abstract

The present application provides a kind of pipe diameter inner shot blasting device centralizer, including throw head arm, throw head arm one end is equipped with throw head, throw head arm is equipped with centralizer ring, centralizer ring is equipped with multiple curved support rods, support rod can be telescopic, support rod one end is equipped with universal ball bearing, multiple universal ball bearings are abutted on pipe diameter;Multiple universal ball bearings are jetted towards the side of pipe diameter.Just by the free rotation of its ball, universal ball bearing is adapted to the horizontal movement of pipe diameter rotation and throw head, reduce the resistance when throw head and pipe diameter relative motion.At the same time, the buffer mechanism of support rod and spring can reduce the larger vibration generated when universal ball bearing ball passes through pipe diameter weld, buffer the impact of throw head deadweight to the whole equipment.Universal ball bearing ejects the reaction force of gas and offsets the gravity of throw head arm part.Avoid throw head and pipe diameter contact, avoid scratch when universal ball bearing and pipe diameter contact, affect pipe diameter quality.

Description

Technical Field

[0001] This invention relates to the field of pipe diameter corrosion protection, and in particular to a centralizer for shot blasting devices inside pipe diameter. Background Technology

[0002] Before applying an anti-corrosion coating, the inner wall of large-diameter pipes must undergo shot blasting to remove surface rust and create a certain degree of anchoring pattern on the inner wall surface, facilitating subsequent internal anti-corrosion processes. The shot blasting equipment for steel pipes includes a blasting arm and a blasting head at the end of the arm. During operation, the blasting head extends into the steel pipe and propels steel shot and grit. As the steel pipe rotates and moves back and forth, the rust layer on the inner wall is impacted and removed.

[0003] However, the blasting arm of internal shot blasting equipment is long, and the mass of the blasting head is very large. In actual operation, the blasting arm cannot be kept horizontal, and the blasting head sinks and directly contacts the inner wall of the steel pipe, resulting in poor shot blasting effect, uneven rust removal, and even affecting the normal operation of the blasting head. Moreover, it greatly increases the resistance when the steel pipe rotates and moves back and forth. Furthermore, the internal shot blasting of the pipe diameter will result in a large amount of steel shot, and the extension components or other parts on the blasting arm will be damaged to some extent after being impacted by the steel shot. Further, existing technologies add support components to the blasting arm and fixed brackets to the bottom of the shot blasting. The rollers at the bottom of the fixed brackets are generally made of steel. When the steel rollers roll on the inner wall of the pipe diameter, they will cause scratches, affecting the pipe diameter quality. To address these issues, we propose a centralizer for internal shot blasting devices.

[0004] Chinese patent document CN 204725340 U records "Shot Blasting Head Limiting Device for Steel Pipe Inner Shot Blasting Equipment" mentions a shot blasting head limiting device for steel pipe inner shot blasting equipment. However, the following problems have occurred in the actual use of this device: (1) Poor sealing and impact resistance of the rotating structure: The bearings and sealing rings in its structure are easily impacted by steel shot. After the inner shot blasting equipment has been working for a long time, the rollers often wear out, causing the bearings to jam. Due to the closed design of its mechanism, it is very difficult to replace the inner dustproof ring; (2) Poor structural connection: The outer diameter expansion component and the plate body mainly adopt threaded connection. The threads are mostly exposed. After being impacted by steel shot, the threads wear out, making it difficult to replace spare parts normally; (3) Lack of buffer mechanism: When processing straight seam and spiral submerged arc welded pipes, the weld seam height of the welded pipe will cause the inner shot blasting equipment to jump during operation, resulting in a large amplitude of head vibration and a significant reduction in the stability and durability of the various transmission components of the head; (4) Complex structure and large volume: The device has a large volume and mass, a complex overall structure, long assembly time, and high labor intensity. (5) High maintenance cost. Taking the shot blasting head limiting device of the shot blasting equipment in φ1219 steel pipe as an example, the device needs to be equipped with 12 sets of expansion plates and 12 polyurethane (or nylon) wheels. However, the polyurethane wheels are vulnerable parts with a short service life and high maintenance cost. There are defects in their use and they need to be improved. Summary of the Invention

[0005] This invention provides a stabilizer for an internal shot blasting device, which solves the problem that when the shot blasting head sinks, it directly contacts the inner wall of the steel pipe, resulting in poor shot blasting effect, uneven rust removal, and even affecting the normal operation of the shot blasting head.

[0006] Another problem solved by this invention is that the addition of a support to the shot blasting arm and the addition of a fixed bracket at the bottom of the shot blasting device, with the rollers at the bottom of the fixed bracket generally made of steel, will cause scratches when the steel rollers roll on the inner wall of the pipe, affecting the quality of the pipe.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a centralizer for shot blasting device in pipe diameter, including a shot blasting arm, a shot blasting head at one end of the shot blasting arm, a centralizer ring on the shot blasting arm, a plurality of curved support rods on the centralizer ring, the support rods being telescopic, a universal ball bearing at one end of the support rods, and the plurality of universal ball bearings abutting against the pipe diameter.

[0008] Multiple universal ball bearings spray air towards one side of the pipe diameter.

[0009] In the preferred embodiment, the straightening ring includes two semicircular rings, each with a mounting base at both ends. The two semicircular rings are connected to each other by the mounting bases at both ends, and multiple through holes are arranged in a circumferential array on one side of the semicircular ring.

[0010] In a preferred embodiment, the semicircular ring is provided with annular air holes, one of the semicircular rings is provided with an air injection hole, the air injection hole is connected to the annular air holes, and the through hole is provided with a keyway.

[0011] The air injection port is connected to the air passage of the blasting head.

[0012] In a preferred embodiment, the support rod includes a first support rod and a bent rod. The top of the first support rod is provided with a screw, and the bottom of the first support rod is provided with a threaded hole. The screw abuts against the through hole, and the inside of the first support rod is provided with an internal vent hole.

[0013] In the preferred embodiment, a key is provided on one side of the screw, the key slides against the keyway, and the outlet end of the internal vent is connected to the vent.

[0014] In the preferred embodiment, multiple second supports are provided between the first support rod and the bent rod. The second supports have the same structure as the screw rod, and the multiple second supports are connected end to end.

[0015] In a preferred embodiment, a spring is provided on the support rod, with one end of the spring abutting against the outer wall of the centering ring and the other end of the spring abutting against the first support rod.

[0016] In a preferred embodiment, the universal ball bearing includes a housing, the outer wall of which is a hemispherical structure, a rolling ball inside the housing, a graphite layer between the ball and the housing, and a sealing ring at the bottom of the graphite layer.

[0017] In the preferred embodiment, the outer casing has multiple arc-shaped holes inside, which are connected to the internal vent holes inside the universal ball bearing, and the outer casing is threadedly connected to the bent rod.

[0018] In the preferred embodiment, the shot peening direction of the blasting head is tilted downwards.

[0019] The beneficial effects of this invention are as follows: the universal ball bearing adapts to the rotation of the pipe diameter and the horizontal movement of the throwing head through the free rotation of its balls, reducing the resistance when the throwing head moves relative to the pipe diameter. At the same time, the buffer mechanism composed of the support rod and the spring can reduce the large vibration generated when the universal ball bearing balls pass through the weld of the pipe diameter, buffering the impact of the throwing head's own weight on the overall equipment.

[0020] For pipe diameter differences that are large, the number of second support rods can be increased or decreased. For pipe diameter differences that are small, the length of the support rod extending out of the through hole, the connection length between the first and second support rods, and the connection length between the bent rod and the universal ball bearing can be adjusted to make the overall device adaptable to pipe diameters of different sizes.

[0021] The reaction force of the shot peening head provides a horizontal upward force to the shot peening arm, offsetting part of its weight. The reaction force of the gas ejected from the multiple universal ball bearings also offsets part of the shot peening arm's weight. This process avoids direct contact between the shot peening head and the pipe diameter, and also prevents scratches that could occur if the universal ball bearings come into contact with the pipe diameter, thus affecting pipe quality.

[0022] The gas ejected from the universal ball bearing can keep the steel shot and grit inside the pipe away, preventing damage to the components on the blasting head arm and also preventing the steel shot and grit from impacting the universal ball bearing and causing damage.

[0023] Universal ball bearings employ an enclosed spherical shell structure to completely surround the bearing balls, minimizing the exposed area of ​​the balls and thus reducing the impact of steel shot and grit on the balls. Universal ball bearings use graphite lubrication instead of roller lubrication, preventing steel shot and dust from entering between the balls and the shell and causing complete seizure. The spherical shell effectively avoids the contact between the traditional cylindrical shape and the weld seam within the pipe diameter, making it highly valuable for widespread adoption. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0025] Figure 1 This is a side view of the overall structure of the present invention;

[0026] Figure 2 This is a top view of the overall structure of the invention from another perspective;

[0027] Figure 3 This is a front view of a partial structure of the present invention;

[0028] Figure 4 This is a side view of a partial structure of the present invention;

[0029] Figure 5 This is a cross-sectional view of a partial structure of the present invention;

[0030] Figure 6 This is a side view of the support rod and universal ball bearing of the present invention;

[0031] Figure 7 This is an exploded view of the support rod of the present invention;

[0032] Figure 8 This is an axonal view of the universal ball bearing of the present invention;

[0033] Figure 9 This is a partial cross-sectional view of the universal ball bearing of the present invention;

[0034] Figure 10 This is the present invention. Figure 9 A magnified view of A in the middle;

[0035] In the diagram: 1. Throwing head arm; 2. Straightening ring; 201. Semicircular ring; 202. Through hole; 203. Mounting base; 204. Air hole; 205. Keyway; 206. Air injection hole; 3. Support rod; 301. First support rod; 3011. Screw; 3012. Threaded hole; 3013. Internal vent hole; 3014. Key; 302. Second support rod; 303. Bending rod; 4. Universal ball bearing; 401. Housing; 402. Ball bearing; 403. Graphite layer; 404. Sealing ring; 405. Arc-shaped hole; 5. Throwing head; 6. Pipe diameter; 7. Bolt; 8. Spring. Detailed Implementation

[0036] Example 1:

[0037] like Figure 1-10 In the middle, a centralizer for a shot blasting device with an inner diameter includes a shot blasting arm 1, a shot blasting head 5 at one end of the shot blasting arm 1, a centralizer ring 2 on the shot blasting arm 1, and a plurality of curved support rods 3 on the centralizer ring 2. The support rods 3 are telescopic, and a universal ball bearing 4 is provided at one end of the support rod 3. The plurality of universal ball bearings 4 abut against the pipe diameter 6.

[0038] Multiple universal ball bearings 4 spray air towards one side of the pipe diameter 6. With this structure, the shot peening head 5 at one end of the shot peening arm 1 requires an air supply, but the air injection port 206 on the centering ring 2 can share the air supply with the shot peening head 5, eliminating the need for an additional air source. The overall structure requires only a few bolts and other connecting parts, simplifying the device structure and reducing the labor intensity of installation and maintenance.

[0039] When the throwing head 5 sinks due to its own weight, the universal ball bearing 4 structure can abut against the inner wall of the steel pipe, preventing the bottom of the throwing head 5 from contacting the pipe diameter 6. During the forward and backward translation of the throwing head 5 within the rotating pipe diameter 6, the supporting universal ball bearing 4 adapts to the rotation of the pipe diameter 6 and the horizontal movement of the throwing head 5 through the free rotation of its rolling balls 402, reducing the resistance when the throwing head 5 moves relative to the pipe diameter 6. At the same time, the buffer mechanism composed of the support rod 3 and the spring 8 can reduce the large vibration generated when the balls of the universal ball bearing 4 pass through the weld of the pipe diameter 6, buffering the impact of the throwing head 5's own weight on the overall equipment.

[0040] The multiple support rods 3 on the centering ring 2 are adjustable in length. By changing the number of second support rods 302 and the extension length of the connection between the first support rod 301 and the bolt 7, the entire device can easily adapt to pipe diameters 6 with different inner diameters, keeping the throwing head 5 as close to the center of the pipe diameter 6 as possible. Because the support rods 3 use a female threaded connection, they ensure easy replacement while also providing protection against steel shot and grit impacts. Operation is time-saving, labor-saving, and disassembly is convenient.

[0041] As an improvement, the stepped structure provided on the first support rod 301 of the support rod 3 ensures that steel shot leaks out from the gaps in the spring 8, thus preventing it from accumulating in the spring 8 and damaging it, thereby improving the durability of the buffer mechanism.

[0042] When the support rod 3 and the universal ball bearing 4 are combined, the tension of the spring 8 can be finely adjusted by loosening the fixing bolt 7 of the first support rod 301, and the distance between the universal ball bearing 4 and the support rod 3 can also be finely adjusted. For pipe diameter differences, the number of second support rods 302 can be increased or decreased; for pipe diameter differences, the length of the support rod 3 extending out of the through hole 202, the connection length between the first support rod 301 and the second support rod 302, and the connection length between the bent rod 303 and the universal ball bearing 4 can be adjusted to make the overall device adaptable to pipe diameters of different sizes. The overall device can be used in internal spraying equipment, improving equipment interchangeability.

[0043] During shot peening, the blasting head 5 rotates and tilts downwards to eject steel shot. The reaction force of the air jet from the blasting head 5 provides a horizontal upward force to the blasting arm 1, offsetting part of the weight of the blasting arm 1. Simultaneously, due to the curved structure of the support rod 3, the gas ejected from the multiple universal ball bearings 4 tilts downwards, towards one side of the blasting head 5. The reaction force of the gas from the universal ball bearings 4 offsets part of the weight of the blasting arm 1, further preventing the blasting head 5 from contacting the pipe diameter 6, and also preventing scratches that would occur if the universal ball bearings 4 were in contact with the pipe diameter, thus avoiding any impact on the quality of the pipe diameter 6.

[0044] Meanwhile, the gas ejected from the universal ball bearing 4 can keep the steel shot and grit inside the pipe 6 away from the straightening device, preventing damage to the extension components or other parts on the throwing head arm after impact with the steel shot and grit. Furthermore, it also prevents the steel shot and grit from impacting the universal ball bearing 4, avoiding damage to the universal ball bearing 4 caused by steel shot entering between the rolling balls 402 and the outer casing 401.

[0045] The universal ball bearing 4 employs an enclosed spherical shell structure to enclose the bearing balls 402, minimizing the exposed area of ​​the balls 402 and thus reducing the impact of steel shot and grit on the balls. The universal ball bearing 4 uses graphite lubrication instead of roller lubrication, preventing steel shot and dust from entering between the balls 402 and the outer shell 401 and causing complete jamming. The spherical shape of the outer shell 401 effectively avoids contact with the weld seam within the pipe diameter 6, a problem associated with traditional cylindrical shapes.

[0046] The overall structure can adapt to pipe diameters of different sizes, has good sealing and impact resistance, and is simple in structure, small in size, short in assembly time, and low in labor intensity.

[0047] In the preferred embodiment, the straightening ring 2 includes two semicircular rings 201, each with a mounting base 203 at both ends. The two semicircular rings 201 are connected to each other by the mounting bases 203 at both ends. Multiple through holes 202 are arranged in a circumferential array on one side of each semicircular ring 201. With this structure, the lengths of the multiple support rods 3 on the straightening ring 2 can be adjusted. By changing the number of second support rods 302 and the extension length of the connection between the first support rod 301 and the bolt 7, the entire device can easily adapt to pipe diameters 6 with different inner diameters, keeping the throwing head 5 as close to the center of the pipe diameter 6 as possible. Because the support rods 3 use a female threaded connection, they ensure easy replacement while also providing protection against steel shot and grit impacts, making operation time-saving, labor-saving, and easy to disassemble.

[0048] In a preferred embodiment, the semi-circular ring 201 is provided with annular air holes 204, one of the semi-circular rings 201 is provided with an air injection hole 206, the air injection hole 206 is connected to the annular air holes 204, and the through hole 202 is provided with a keyway 205.

[0049] The air injection port 206 is connected to the air passage of the blasting head 5. With this structure, the blasting head 5 at one end of the blasting head arm 1 requires an air supply, and the air injection port 206 on the straightening ring 2 can share the air supply with the blasting head 5, eliminating the need for an additional air source. The overall structure requires only a few bolts and other connecting parts, simplifying the device structure and reducing the labor intensity of installation and maintenance.

[0050] In a preferred embodiment, the support rod 3 includes a first support rod 301 and a bent rod 303. The first support rod 301 has a screw 3011 at its top and a threaded hole 3012 at its bottom. The screw 3011 abuts against the through hole 202. An internal vent hole 3013 is provided inside the first support rod 301. With this structure...

[0051] In a preferred embodiment, a key 3014 is provided on one side of the screw 3011. The key 3014 slides against the keyway 205, and the outlet end of the inner vent 3013 communicates with the vent 204. With this structure, the key 3014 slides against the keyway 205 to prevent the support rod 3 from rotating, thus ensuring the airflow direction of the universal ball bearing 4 is fixed, and directing the airflow from the universal ball bearing 4 towards the jetting head 5.

[0052] In the preferred embodiment, multiple second support rods 302 are provided between the first support rod 301 and the bent rod 303. The second support rods 302 have the same structure as the screw rod 3011, and the multiple second support rods 302 are connected end to end. With this structure, the lengths of the multiple support rods 3 on the straightening ring 2 can be adjusted. By changing the number of second support rods 302 and the extension length of the connection between the first support rod 301 and the bolt 7, the overall device can easily adapt to pipe diameters 6 with different inner diameters, so as to keep the throwing head 5 as close as possible to the center of the pipe diameter 6. Since the support rods 3 adopt the form of female thread connection, they ensure convenient replacement while also providing protection against steel shot and grit impact, making operation time-saving, labor-saving, and easy to disassemble.

[0053] In the preferred embodiment, a spring 8 is provided on the support rod 3. One end of the spring 8 abuts against the outer wall of the straightening ring 2, and the other end of the spring 8 abuts against the first support rod 301. With this structure, the buffer mechanism composed of the support rod 3 and the spring 8 can reduce the large vibration generated when the balls of the universal ball bearing 4 pass through the weld of the pipe diameter 6, and buffer the impact of the weight of the throwing head 5 on the overall equipment.

[0054] In a preferred embodiment, the universal ball bearing 4 includes a housing 401 with a hemispherical outer wall. Rolling balls 402 are housed within the housing 401, and a graphite layer 403 is positioned between the balls 402 and the housing 401. A sealing ring 404 is located at the bottom of the graphite layer 403. This structure provides the universal ball bearing 4 with an enclosed spherical shell, effectively minimizing the exposed area of ​​the balls 402 and thus reducing the impact of steel shot on the balls. The universal ball bearing 4 uses graphite lubrication instead of roller lubrication, preventing steel shot and dust from entering between the balls 402 and the housing 401 and causing complete jamming. The spherical shape of the housing 401 effectively avoids the contact between the conventional cylindrical shape and the weld seam within the pipe diameter 6.

[0055] In a preferred embodiment, the outer casing 401 has multiple arc-shaped holes 405 inside, which communicate with the internal vent holes inside the universal ball bearing 4. The outer casing 401 is threadedly connected to the bent rod 303. With this structure, the gas ejected from the universal ball bearing 4 can keep the steel shot and grit inside the pipe 6 away from the centering device, preventing damage to the extended components or other parts on the throwing head arm from the impact of the steel shot and grit. Furthermore, it also prevents the steel shot and grit from impacting the universal ball bearing 4, avoiding damage to the universal ball bearing 4 caused by the steel shot entering between the rolling balls 402 and the outer casing 401.

[0056] In the preferred embodiment, the shot peening direction of the blasting head 5 is tilted downwards. With this structure, during shot peening, the blasting head 5 rotates and ejects steel shot at an angle downwards. The kinetic energy of the blasting head 5's rotation and the reaction force from the ejected shot provide a horizontal upward force to the blasting head arm 1, offsetting part of the arm's weight. Simultaneously, because the support rod 3 has a curved structure, the gas ejected from the multiple universal ball bearings 4 is tilted downwards, angled towards one side of the blasting head 5.

[0057] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The scope of protection of the present invention should be defined as the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A stabilizer for shot blasting devices within a pipe diameter, characterized in that: It includes a throwing head arm (1), a throwing head (5) at one end of the throwing head arm (1), a straightening ring (2) on the throwing head arm (1), and multiple curved support rods (3) on the straightening ring (2). The support rods (3) are telescopic, and a universal ball bearing (4) is provided at one end of the support rod (3). The multiple universal ball bearings (4) abut against the pipe diameter (6). Multiple universal ball bearings (4) spray air towards the side of the pipe diameter (6); The straightening ring (2) includes two semicircular rings (201). Each of the two ends of the semicircular ring (201) is provided with a mounting seat (203). The two semicircular rings (201) are connected to each other by the mounting seats (203) at both ends. Multiple through holes (202) are arranged in a circular array on one side of the semicircular ring (201). The semi-circular ring (201) is provided with annular air holes (204), and one of the semi-circular rings (201) is provided with an air injection hole (206). The air injection hole (206) is connected to the annular air holes (204), and the through hole (202) is provided with a keyway (205). The air injection port (206) is connected to the air passage of the throwing head (5); The support rod (3) includes a first support rod (301) and a bent rod (303). The first support rod (301) has a screw (3011) at the top and a threaded hole (3012) at the bottom. The screw (3011) abuts against the through hole (202). The first support rod (301) has an internal vent hole (3013) inside. A key (3014) is provided on one side of the screw (3011). The key (3014) slides against the keyway (205). The outlet end of the internal vent (3013) is connected to the vent (204).

2. The stabilizer for an in-diameter shot blasting device according to claim 1, characterized in that: Multiple second supports (302) are provided between the first support rod (301) and the bent rod (303). The second supports (302) have the same structure as the screw rod (3011), and the multiple second supports (302) are connected end to end.

3. The stabilizer for an in-diameter shot blasting device according to claim 1, characterized in that: A spring (8) is provided on the support rod (3). One end of the spring (8) abuts against the outer wall of the straightening ring (2), and the other end of the spring (8) abuts against the first support rod (301).

4. The stabilizer for an in-diameter shot blasting device according to claim 1, characterized in that: The universal ball bearing (4) includes a housing (401), the outer wall of the housing (401) is a hemispherical structure, a rolling ball (402) is provided inside the housing (401), a graphite layer (403) is provided between the ball (402) and the housing (401), and a sealing ring (404) is provided at the bottom of the graphite layer (403).

5. A stabilizer for an in-diameter shot blasting device according to claim 4, characterized in that: The housing (401) has multiple arc-shaped holes (405) inside, which are connected to the internal vent holes inside the universal ball bearing (4). The housing (401) is threadedly connected to the bent rod (303).

6. The stabilizer for an in-diameter shot blasting device according to claim 1, characterized in that: The shot peening direction of the shot blasting head (5) is tilted downward.

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