In-line rapid sandblasting device and method

Abstract

The application relates to a pipe-in quick sand blasting device and method, and the pipe-in quick sand blasting device comprises a sand tank, a walking track, a sand blasting sleeve, an abrasive material recovery box, a backflow sand blasting head, a tail end abrasive material collecting box and an abrasive material recovery system, wherein the sand tank is installed on the walking track and can reciprocate along the ground walking track, one end of the sand blasting sleeve is fixedly connected with the sand tank, the other end is connected with the backflow sand blasting head, the backflow sand blasting head is assembled at the front end of the sand blasting sleeve, the sand blasting sleeve passes through the abrasive material recovery box and can reciprocate in the oil pipe under the driving of the sand tank, the abrasive material recovery box and the tail end abrasive material collecting box cooperatively fix and support two ends of the oil pipe, and the oil pipe is guaranteed to be horizontal. The sand blasting process is realized through the backflow sand blasting head, then the abrasive material flows back to the sand collecting box along the middle layer of the sleeve under the action of the abrasive material recovery box, the abrasive material has no contact with the pipe wall after sand blasting, and the uniformity of the anchor marks is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sand blasting rust removal, in particular to a pipe internal rapid sand blasting device and method. BACKGROUND

[0002] Surface treatment of coating workpieces is a key step of coating construction, and the quality of surface treatment directly affects the reliability of coating use. Since oil pipes generally have small diameters and large lengths, most surface treatment methods are limited. Currently, the rust removal methods commonly used for the inner wall of oil pipes include pickling, tool rust removal and sand blasting. Among them, sand blasting is the most widely used method in the field of pipe rust removal due to its environmental protection and ease of operation. The sand blasting process uses compressed air as power to drive abrasive through a nozzle to be sprayed at high speed onto the surface of the workpiece to be treated to remove rust and dirt on the surface of the workpiece, so that the surface of the workpiece obtains a certain cleanliness and different anchoring degree, thereby improving the mechanical properties of the surface of the workpiece, thus improving the fatigue resistance of the workpiece, increasing the adhesion between the workpiece and the coating, prolonging the durability of the coating film, and also being beneficial to the leveling of the coating.

[0003] With the development of corrosion prevention technology for oil well pipes in oil fields, the application amount of internally coated oil pipes gradually increases. Since oil well pipes are small-diameter and slender steel pipes, in order to achieve comprehensive rust removal of the inner cavity of the pipe body, the current pipe internal sand blasting equipment is to insert a gun barrel into the slender steel pipe from one end, to remove rust by spraying abrasive in the inner cavity of the pipe body through high-pressure air, and to discharge the abrasive from the other end of the steel pipe after sand blasting. With the reciprocating movement of the sand blasting gun head between the two ends and the self-rotation of the oil pipe, full-pipe sand blasting rust removal is completed.

[0004] CN202110434014.4 discloses a sand blasting device capable of automatically replacing abrasive and recycling abrasive, comprising a sand blasting machine, a filter cavity is arranged in the sand blasting machine, a roller mechanism is arranged in the filter cavity, a storage cavity is arranged in the sand blasting machine, a chute is arranged in communication between the filter cavity and the storage cavity, and a through groove is arranged on the lower side of the chute in communication with the filter cavity and the storage cavity. The present application performs sand blasting work through the principle of suction type sand blasting, can adjust the sand blasting position and turn over the object to uniformly sand blast during sand blasting, collects the sprayed abrasive during sand blasting, screens out small particles and recycles them for reuse, realizes recycling, saves cost and is environmentally friendly, and can freely switch different abrasives according to different sand blasting requirements, which is time-saving, labor-saving, convenient and fast.

[0005] CN202011529948.8 discloses a drum-type sand blasting equipment, relates to the technical field of sand blasting devices, and comprises a box body and a rack, the box body is fixed on the rack, a sand blasting assembly is arranged on the box body, the box body comprises two side doors, one side door is rotationally connected to the rack, a driving assembly is fixed to the side door, a fixing assembly is arranged on the driving assembly, a placing cage assembly for placing workpieces is placed on the fixing assembly, the placing cage assembly comprises a bottom surface, a plurality of first inclined surfaces, a plurality of side surfaces and a plurality of second inclined surfaces, the plurality of first inclined surfaces are fixed to the bottom surface, the plurality of side surfaces are fixed to the plurality of first inclined surfaces, and the plurality of second inclined surfaces are fixed to the plurality of side surfaces. The application has the effect of facilitating replacement of workpieces.

[0006] The sand blasting process has the following problems when applied:

[0007] (1) After sand blasting, the roughness of the whole pipe is uneven. Since the abrasive is discharged from one end after sand blasting, the roughness of the base body at the abrasive discharge end is much smaller than that at the gun barrel entry end under the action of abrasive gravity and sand blasting power. Since the roughness of the base body directly affects the adhesion strength and uniformity of the coated coating, the coating performance is unstable;

[0008] (2) The sand blasting process takes a long time. In order to improve the uniformity of the roughness of the sand blasting pipe, some manufacturers use a one-way sand blasting process with a return stop. The process increases the process time of sand blasting and the production cost of the inner coating oil pipe;

[0009] (3) The automatic recovery route of the abrasive is long, and the loss is large. In order to reduce the cost, the sand blasting equipment is currently used to realize the automatic recovery of the abrasive to the sand tank at the end of the sand blasting gun by using a conveyor belt. Since the abrasive is collected at the other end of the steel pipe, the conveying distance is long, the abrasive loss is large, and the energy consumption is large. SUMMARY

[0010] The present application provides a kind of pipe fast sand blasting device and method for the above problems existing in prior art, by backflow sand blasting head to realize sand blasting process, then abrasive flows to sand collecting tank along sleeve middle layer under the action of abrasive recovery tank, abrasive has no contact with pipe wall after sand blasting, ensure the uniformity of anchor mark.

[0011] Technical scheme: a kind of pipe fast sand blasting device, comprising:

[0012] sand tank, walking track, sand blasting sleeve, abrasive recovery tank, backflow sand blasting head, tail end abrasive collecting tank and abrasive recovery system,

[0013] Wherein, sand tank is installed on walking track, can reciprocate along ground walking track,

[0014] The one end of the sand blasting sleeve is fixedly connected with the sand tank, the other end is connected with the backflow sand blasting head, the backflow sand blasting head is assembled at the front end of the sand blasting sleeve, the sand blasting sleeve passes through the abrasive recovery tank, and the sand blasting sleeve can reciprocate in the oil pipe under the driving of the sand tank,

[0015] The abrasive recovery tank and the tail end abrasive collection tank cooperatively support the two ends of the oil pipe to ensure that the oil pipe is horizontal.

[0016] As a preferred scheme of the in-pipe rapid sand blasting device, the length of the walking track is greater than the length of the sand blasting sleeve.

[0017] As a preferred scheme of the in-pipe rapid sand blasting device, the sleeve passing hole at the rear of the abrasive recovery tank is matched with the sand blasting sleeve for the sand blasting sleeve to pass through.

[0018] As a preferred scheme of the in-pipe rapid sand blasting device, the sand blasting sleeve comprises an abrasive protection pipe, a high-pressure sand blasting pipe, an inter-pipe support and a sand collecting channel, wherein the abrasive protection pipe is located at the outer layer, the high-pressure sand blasting pipe is located at the inner layer, the two pipes are coaxially assembled and connected by the non-closed inter-pipe support, and the abrasive protection pipe cooperates with the oil pipe to form the sand collecting channel.

[0019] As a preferred scheme of the in-pipe rapid sand blasting device, the abrasive protection pipe is a semi-closed pipe and is uniformly provided with holes, can pass through sand and has the same size as the inner diameter of the oil pipe.

[0020] As a preferred scheme of the in-pipe rapid sand blasting device, the high-pressure sand blasting pipe is a closed pipe and is communicated with the pressure of the sand tank.

[0021] As a preferred scheme of the in-pipe rapid sand blasting device, the sand collecting channel is communicated with the pressure of the abrasive recovery tank, when the dust collection device is opened, the abrasive recovery tank and the sand collecting channel both form negative pressure, and the abrasive recovery can be realized.

[0022] As a preferred scheme of the in-pipe rapid sand blasting device, the abrasive recovery tank comprises a dust collection channel and a sand outlet, wherein the dust collection channel is located above the abrasive recovery tank and is connected with the dust collection device, and the sand outlet is located at the lower end of the abrasive recovery tank and is connected with the abrasive recovery system.

[0023] As a preferred scheme of the in-pipe rapid sand blasting device, the backflow sand blasting head comprises a sand outlet hole, a sand blasting cavity, a sand blocking plate and a sand collecting cavity, wherein the sand outlet hole is a symmetrical inclined hole with an angle to the axis of the oil pipe, is communicated with the high-pressure sand blasting pipe, provides a sand blasting angle for the high-pressure abrasive, the sand blocking plate is a closed structure and can block the free diffusion of the abrasive in the oil pipe, and the sand collecting cavity is communicated with the sand collecting channel.

[0024] In another aspect, the application discloses an in-pipe rapid sand blasting method, which specifically comprises the following steps:

[0025] (1) Position the return sandblasting head inside the abrasive recovery box, open the sand blasting valve of the sand tank, and start moving slowly and at a constant speed.

[0026] (2) The high-pressure gas in the sand tank drives the abrasive to be ejected through the sand outlet of the return sand head along the high-pressure sandblasting pipe, hitting the inner wall of the oil pipe, completing the sandblasting action in the sandblasting chamber, and then being blocked by the sand baffle.

[0027] (3) Under the negative pressure provided by the dust collection device connected to the dust collection channel of the abrasive recovery box, the sand after sandblasting is sucked from the sand collection chamber to the sand collection channel, and flows to the abrasive recovery box under the negative pressure. The dust is sucked away with the dust collection channel, and the sand leaves the oil pipe and falls through the holes of the abrasive protection pipe to the lower sand outlet, and then falls to the abrasive recovery conveyor belt and enters the abrasive recovery system.

[0028] (4) As the reflux blasting head reciprocates in the oil pipe, the inner wall of the entire oil pipe is blasted. The abrasive only contacts the inner wall of the oil pipe in the blasting chamber area, reducing unnecessary wear on the inner wall and ensuring the uniformity of the inner wall roughness after blasting.

[0029] Beneficial effects: The rapid sandblasting device and method for pipelines disclosed in this invention have the following beneficial effects:

[0030] (1) Set up a sandblasting sleeve to ensure that the recovered sand and gravel mainly act within the sleeve, reduce the wear and tear on the inner wall of the tubing caused by the recovered sand and gravel, and ensure the uniformity of the anchor pattern;

[0031] (2) The semi-enclosed structure of the sandblasting sleeve enables the fixed collection of sand and gravel in the front sand collection box, simplifying the equipment structure;

[0032] (3) The combination of the reflux sandblasting gun and sandblasting sleeve realizes the reverse collection of sand and gravel, shortens the sand collection conveyor belt path, and thus reduces the loss rate in the abrasive collection process. Attached Figure Description

[0033] Fig. 1 This is a schematic diagram of the structure of a rapid in-pipe sandblasting device according to the present invention;

[0034] Fig. 2 This is a schematic diagram of the sandblasting sleeve structure of the present invention;

[0035] Fig. 3 This is a schematic diagram of the sandblasting head mechanism of the present invention;

[0036] in:

[0037] 1—Sand pot 2—Travel track

[0038] 3—Sandblasting sleeve

[0039] 31—Abrasive protection pipe; 32—High-pressure sandblasting pipe

[0040] 33—Inter-pipe support; 34—Sand collection channel

[0041] 4—Abrasive Recovery Box

[0042] 41—Dust suction channel; 42—Sand outlet

[0043] 5—Reflow blasting head

[0044] 51—Sandblasting hole; 52—Sandblasting chamber

[0045] 53—Sand baffle plate 54—Sand collection cavity

[0046] 6—Oil pipe 7—Tail end abrasive collection box

[0047] 8—Abrasive recovery conveyor belt; 9—Abrasive recovery system Detailed Implementation

[0048] The specific embodiments of the present invention are described in detail below.

[0049] like Figs. 1-3 As shown, the present invention provides a rapid in-pipe sandblasting device, comprising:

[0050] 1. Sand tank; 2. Traveling track; 3. Sandblasting sleeve; 4. Abrasive recovery box; 5. Return sandblasting head; 7. Tail-end abrasive collection box; and 8. Abrasive recovery system.

[0051] The sand tank 1 is installed on the walking track 2 and can move back and forth along the ground walking track 2.

[0052] One end of the sandblasting sleeve 3 is fixedly connected to the sand tank 1, and the other end is connected to the return sandblasting head 5. The return sandblasting head 5 is mounted on the front end of the sandblasting sleeve 3. The sandblasting sleeve 3 passes through the abrasive recovery box 4 and can reciprocate within the oil pipe 6 under the drive of the sand tank 1.

[0053] The abrasive recovery box 4 and the tail end abrasive collection box 7 work together to fix and support both ends of the oil pipe 6, ensuring that the oil pipe 6 is horizontal.

[0054] Furthermore, the length of the travel track 2 is greater than the length of the sandblasting sleeve.

[0055] Furthermore, the through hole of the sleeve at the rear of the abrasive recovery box 4 matches the sandblasting sleeve 3, allowing the sandblasting sleeve 3 to pass through.

[0056] Furthermore, the sandblasting sleeve 3 includes an abrasive protection pipe 31, a high-pressure sandblasting pipe 32, an inter-pipe support 33, and a sand collection channel 34. The abrasive protection pipe 31 is located in the outer layer, and the high-pressure sandblasting pipe 32 is located in the inner layer. The two pipes are coaxially assembled and connected by an unsealed inter-pipe support 33. The abrasive protection pipe 31 cooperates with the oil pipe to form the sand collection channel 34.

[0057] Further, the abrasive protection pipe 31 is a semi-closed pipe with uniformly distributed holes, which can pass sand and has the same diameter as the oil pipe.

[0058] Further, the high-pressure sand blasting pipe 32 is a closed pipe connected to the sand tank 1.

[0059] Further, the sand collection channel 34 is connected to the abrasive recovery tank 4, and when the dust collection device is turned on, the abrasive recovery tank 4 and the sand collection channel 34 form negative pressure, so that the abrasive recovery can be realized.

[0060] Further, the abrasive recovery tank 4 includes a dust collection channel 41 and a sand outlet 42, wherein the dust collection channel 41 is located above the abrasive recovery tank 4 and is connected to the dust collection device, and the sand outlet 42 is located at the lower end of the abrasive recovery tank 4 and is connected to the abrasive recovery system 8.

[0061] Further, the backflow sand blasting head 5 includes a sand outlet hole 51, a sand blasting cavity 52, a sand blocking plate 53, and a sand collection cavity 54, wherein the sand outlet hole 51 is a symmetrical inclined hole with an angle to the axis of the oil pipe 6, and is connected to the high-pressure sand blasting pipe 32 to provide a sand blasting angle for high-pressure abrasive, the sand blocking plate 53 is a closed structure that can block the free diffusion of abrasive in the oil pipe, and the sand collection cavity 54 is connected to the sand collection channel 34.

[0062] A method for rapid sand blasting in a pipe, specifically comprising the following steps:

[0063] (1) The backflow sand blasting head 5 is located in the abrasive recovery tank 4, the sand tank 1 is opened, and the sand blasting valve is started to slowly and uniformly walk;

[0064] (2) The high-pressure gas in the sand tank 1 drives the abrasive to be sprayed out of the sand outlet hole 51 of the backflow sand blasting head 5 along the high-pressure sand blasting pipe 32, hits the inner wall of the oil pipe, completes the sand blasting action in the sand blasting cavity 52, and is then blocked by the sand blocking plate 53;

[0065] (3) Under the action of the negative pressure provided by the dust collection device connected to the dust collection channel 41 of the abrasive recovery tank 4, the sand after sand blasting is sucked into the sand collection cavity 54 and flows to the sand collection channel 34 under the action of negative pressure, and the dust is sucked away by the dust collection channel 41, the sand falls to the sand outlet 42 at the lower end of the abrasive protection pipe 31 after leaving the oil pipe, and then falls to the abrasive recovery conveyor belt 8 and enters the abrasive recovery system 9;

[0066] (4) With the reciprocating movement of the backflow sand blasting head 5 in the oil pipe, the inner wall of the entire oil pipe is sand blasted, and the abrasive only contacts the inner wall of the oil pipe in the sand blasting cavity 52, reducing unnecessary wear on the inner wall and ensuring the uniformity of the roughness of the inner wall after sand blasting.

[0067] In the description of the application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0068] The preferred embodiments of the patent have been described above in detail, but the patent is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the patent.

Claims

1. An in-line quick sandblasting device, characterized in that, The application relates to a sanding device and a sanding method. The sanding device comprises a sand tank, a walking track, a sanding sleeve, an abrasive material recovery box, a backflow sanding head, a tail-end abrasive material collecting box and an abrasive material recovery system. The sand tank is installed on the walking track and can reciprocate along the ground walking track. One end of the sanding sleeve is fixedly connected with the sand tank, the other end is connected with the backflow sanding head, the backflow sanding head is assembled at the front end of the sanding sleeve, the sanding sleeve passes through the abrasive material recovery box and can reciprocate in the oil pipe under the drive of the sand tank. The sanding sleeve comprises an abrasive material protection pipe, a high-pressure sanding pipe and an inter-pipe support.

2. An in-line quick sandblasting device as claimed in claim 1, characterized in that: The abrasive material protection pipe is located at the outer layer and the high-pressure sanding pipe is located at the inner layer.

3. An in-line quick sandblasting device as claimed in claim 1, characterized in that: The two pipes are coaxially assembled and are connected by the non-closed inter-pipe support.

4. A method of in-line rapid shot blasting using the in-line rapid shot blasting device according to any one of claims 1 to 3, characterized in that, The abrasive material protection pipe and the oil pipe are matched to form a sand collecting channel. The abrasive material protection pipe is a semi-closed pipe and is uniformly provided with holes. The sanding sleeve has the same size as the inner diameter of the oil pipe. The high-pressure sanding pipe is a closed pipe and is communicated with the sand tank pressure. The backflow sanding head comprises a sand outlet hole, a sanding cavity, a sand blocking plate and a sand collecting cavity. The sand outlet hole is a symmetrical inclined hole with an angle to the oil pipe axis and is communicated with the high-pressure sanding pipe to provide a sanding angle for the high-pressure abrasive material. The sand blocking plate is a closed structure. The sanding cavity is located between the sand outlet hole and the sand blocking plate. The abrasive material only contacts the inner wall of the oil pipe in the sanding cavity area. The sand collecting cavity is communicated with the sand collecting channel. The abrasive material recovery box and the tail-end abrasive material collecting box are matched to fixedly support the two ends of the oil pipe to ensure that the oil pipe is horizontal. The sand collecting channel is communicated with the abrasive material recovery box pressure. When the dust collection device is opened, the abrasive material recovery box and the sand collecting channel form negative pressure to realize abrasive material recovery. The abrasive material recovery box comprises a dust collection channel and a sand outlet. The dust collection channel is located above the abrasive material recovery box and is connected with the dust collection device. The sand outlet is located at the lower end of the abrasive material recovery box and is connected with the abrasive material recovery system. The rear sleeve through hole of the abrasive material recovery box is matched with the sanding sleeve to allow the sanding sleeve to pass through. The length of the walking track is greater than the length of the sanding sleeve. The method comprises the following steps: (1) The backflow sanding head is located in the abrasive material recovery box, the sanding valve of the sand tank is opened, and the sanding device starts to slowly and uniformly walk; (2) The high-pressure gas in the sand tank drives the abrasive material to pass through the sand outlet hole of the backflow sanding head along the high-pressure sanding pipe and is sprayed out to hit the inner wall of the oil pipe to complete the sanding action in the sanding cavity and is then blocked by the sand blocking plate; (3) Under the negative pressure provided by the dust collection device through the dust collection channel of the abrasive material recovery box, the sand after sanding is sucked into the sand collecting cavity and flows to the abrasive material recovery box under the negative pressure, wherein the dust is sucked away through the dust collection channel, the sand falls to the sand outlet at the lower end through the holes of the abrasive material protection pipe after leaving the oil pipe, falls to the abrasive material recovery conveyor belt and enters the abrasive material recovery system; (4) With the reciprocating movement of the backflow sanding head in the oil pipe, the inner wall of the whole oil pipe is sanded, the abrasive material only contacts the inner wall of the oil pipe in the sanding cavity area, unnecessary abrasion to the inner wall is reduced, and the uniformity of the roughness of the inner wall after sanding is ensured.

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