CN110586360B

CN110586360B - Sand blasting and spraying integrated device for porous metal coating on surface of metal pipe fitting

Info

Publication number: CN110586360B
Application number: CN201910177755.1A
Authority: CN
Inventors: 杨开远; 杨心宇
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-03-10
Filing date: 2019-03-10
Publication date: 2023-07-07
Anticipated expiration: 2039-03-10
Also published as: CN110586360A

Abstract

The invention relates to a sand blasting and spraying integrated device for a porous metal coating on the surface of a metal pipe fitting, which belongs to a spraying device and consists of a device with a sand blasting section and a spraying section which are in continuous alignment, wherein a plurality of in-line base pipe side supporting wheels and a base pipe clamping operation driving mechanism are arranged on a support rail at intervals in a straight line, a sand blasting box is arranged at the tail end of the support rail, a spraying box is arranged behind the sand blasting box in parallel, and a plurality of pulley supporting piers are arranged in the same straight line with the supporting wheels. The device has reasonable structural design, can finish sand blasting and spraying operation at one time, has high spraying efficiency, good spraying effect, reduced structural size, small occupied area, labor saving, high spraying efficiency, good spraying layer quality, even coating, no axial tensile stress and very small circumferential torsional deformation of the base pipe, very small residual stress of the coating, high binding force of the coating, short interval time from sand blasting to spraying of the base pipe, small passivation of the sand blasting surface, no secondary clamping during spraying, and the device is suitable for the base pipes with various lengths.

Description

Sand blasting and spraying integrated device for porous metal coating on surface of metal pipe fitting

Technical Field

The invention relates to a spraying device, in particular to a sand blasting and spraying integrated device for a porous metal coating on the surface of a metal pipe fitting.

Background

The traditional pipe surface porous metal coating preparation process is that a base pipe is firstly subjected to rust removal and roughening treatment on a sand blasting production line: the base pipe is clamped on the driving trolley, the base pipe rotates and axially moves under the action of the driving trolley, enters the sand blasting box, the surface oxide film is removed under the action of the sand blasting gun, meanwhile, the surface is roughened (the roughening purpose is to improve the surface roughness of the base pipe, and the binding force between a coating and the surface of the base pipe is increased during spraying), and in the process, the support of the part of the base pipe which is not subjected to sand blasting is a manual turnover mechanism, manual operation is needed, and the labor resource is occupied.

The treated base pipe is transferred to a spraying process, in the spraying process, two ends of the base pipe are clamped in a chuck, one end of the chuck is a rotary driving end, the other end of the chuck is a driven end, after the base pipe rotates, a priming spray gun and a working layer spray gun are sequentially ignited, then spraying is started aiming at the axis of the base pipe, the spray gun is driven by a driving trolley to do feeding motion along the axis of the base pipe, a metal porous surface coating is formed on the surface of the base pipe in the motion process, and in the process, the base pipe clamping, rotating and spray gun travelling mechanisms are complex and easy to break down; the middle axial supporting point during the spraying of the base pipe can not form a coating layer at the position due to the shielding effect of the mechanism; the base pipe is heated to generate axial extension in the spraying process, manual tensioning is needed, the problem of untimely tensioning exists in the mode of manually axially tensioning the fixed end chuck, radial runout of the base pipe is easy to generate, and uneven coating is generated; the spraying operator needs to walk along with the spraying trolley so as to monitor and adjust the position of the spray gun at any time, and the labor intensity of the operator is high; the distance between the non-supporting parts of the base pipe is larger, and when the base pipe rotates, radial runout is large due to the action of centrifugal force, so that the formed coating is uneven; the base pipe has torsion and stretching elastic deformation in the spraying process, and after the spraying is completed and the clamping is removed, the residual stress of the coating is larger, so that the binding force of the coating is reduced; the interval time from sand blasting to spraying of the base pipe is long, the sand blasted surface is easy to passivate, and the binding force of the coating is reduced; the base pipe is clamped secondarily from the sand blasting to the spraying, and the working efficiency of the device is low; the device cannot adapt to metal pipes with various lengths, and the whole occupied area of the device is large; the flue gas suction hood is as long as the production line, and the required induced draft fan has higher power; the air supply line of the spray gun and the power line of the walking trolley are of a hanging following structure, and the structure is complex.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a sand blasting and spraying integrated device for a porous metal coating on the surface of a metal pipe.

The invention relates to a sand blasting and spraying integrated device for a porous metal coating on the surface of a metal pipe, which consists of a sand blasting section and a spraying section which are in continuous alignment, wherein a plurality of in-alignment base pipe supporting mechanisms and a base pipe clamping operation driving mechanism are arranged on a support rail at intervals in a straight line, a sand blasting box is arranged at the tail end of the support rail, a spraying bench is arranged behind the sand blasting box in parallel, and a plurality of pulley supporting piers are arranged in the same straight line with the base pipe supporting mechanisms.

As a further improvement of the invention, two parallel rails are arranged on the support rail, a plurality of straight-line base pipe supporting mechanisms extending to the space between the two rails are fixed on one side rail at intervals, the two rails are provided with riding electric trolleys, the electric trolleys are provided with driving motors, driving gears of the motors are meshed with racks on the rails, and the front ends of the electric trolleys are provided with base pipe connecting clamps, so that the base pipe clamping operation driving mechanism is formed.

As a further improvement of the invention, the sand blasting box at the tail end of the rail is composed of a sand suction pipe at the bottom of a sand feeding hopper connected to the root of a sand blasting gun, a high-pressure air line connected to the tail of the sand blasting gun, and a sand blasting nozzle of the sand blasting gun radially aligned with the axis of a base pipe penetrating through the sand blasting box.

As a further improvement of the invention, the middle part of the sand blasting box is a sand blasting chamber, a base pipe passes through the sand blasting chamber, and a sand blasting nozzle is aligned with the axis of the base pipe; the lower part of the sand spraying box is connected with a sand feeding hopper, and a sand sucking pipe at the bottom of the sand spraying box is connected to a sand spraying gun; the upper part of the sand spraying box is provided with a dust hood which is connected with an air guide duct; the high-pressure air line at the tail end of the sand blasting nozzle is connected to the air pressure buffer tank and the air compressor.

As a further improvement of the invention, more than one powder flame spray gun is arranged on the spraying rack in parallel, the tail part of the powder flame spray gun is connected with an acetylene gas pipe and an oxygen pipe, the side wall of the neck part of the powder flame spray gun is provided with a metal powder tank communicated with the spray gun, the neck part is a feeding part, and the lower part of the feeding part is connected with a material mixing combustion part and a flame nozzle of the powder flame spray gun.

As a further improvement of the invention, the powder flame spray guns on the spray stand are divided into a backing spray gun and at least one working layer spray gun, and the nozzles of the powder flame spray guns are aligned with the axis of the base pipe.

As a further improvement of the invention, a base pipe transversely passes through the upper part of the spraying rack, a bottoming spray gun and a working layer spray gun which are arranged in parallel are fixed on a bottom bracket, and flame nozzles of the base pipe are aligned with the axis of the base pipe one by one; the upper part of the spraying bench is provided with a smoke exhaust hood which is connected with a smoke exhaust pipe and is connected with a chimney through a draught fan.

As a further improvement of the invention, the base pipe supporting mechanism consists of a cylinder, a cylinder fixing frame, a wheel seat, a left supporting guide wheel I, a right supporting guide wheel I and an upper limiting guide wheel I, wherein the cylinder is vertically fixed on the cylinder fixing frame, the wheel seat is transversely fixed on a cylinder ejector rod of the cylinder, two wheel frames are symmetrically and vertically fixed on the wheel seat at two sides of the cylinder ejector rod, a steering motor is vertically fixed at the right side of the wheel seat, an upper limiting guide wheel supporting rod is linked with an output shaft of the steering motor, the transverse end of the upper limiting guide wheel supporting rod is assembled with an upper limiting guide wheel I, and the left supporting guide wheel I, the right supporting guide wheel I and the upper limiting guide wheel I form a triangle, so that the middle of the base pipe penetrates through.

As a further improvement of the invention, the base pipe connecting clamp consists of a sleeve seat, a traction cone, a pull rod, an operating screw disc and a pusher dog, wherein the traction cone and the pull rod are coaxially integrated, the pull rod penetrates through the sleeve seat and is in clearance fit, an expansion joint is sleeved between a shoulder at the inner side of the traction cone and the end head of the sleeve seat, the pusher dog is symmetrically arranged at the tail end of the pull rod, the pusher dog penetrates through a strip hole of the sleeve seat, the outer opening of the operating screw disc abuts against the end face of the pusher dog, the traction cone is inserted into a port of the base pipe, the traction cone is pulled by the pull rod, the expansion joint on the rod of the traction cone is expanded with the inner wall of the base pipe, a flange integrated with the traction cone is arranged at the tail end of the sleeve seat, and the flange is connected with the electric trolley.

As a further improvement of the invention, the rear of the spraying rack is provided with an air-roof supporting device which is in the same straight line with a base pipe supporting mechanism, the air-roof supporting device consists of a supporting rod, a supporting frame, a left supporting guide wheel II, a right supporting guide wheel II and an upper limiting guide wheel II, the supporting frame is transversely fixed on the supporting rod, two wheel frames are symmetrically and vertically fixed on the supporting frame at two sides of the supporting rod, the upper ends of the two lower wheel frames are respectively assembled with the left supporting guide wheel II and the right supporting guide wheel II, a steering motor is vertically fixed on the right side of the supporting frame, an upper limiting guide wheel supporting rod is linked with an output shaft of the steering motor, the transverse end of the upper limiting guide wheel supporting rod is assembled with the upper limiting guide wheel II, and the left supporting guide wheel II, the right supporting guide wheel II and the upper limiting guide wheel II form a regular triangle and surround the base pipe in an equal gap manner; three gas nozzles perpendicular to the axis of the base pipe are arranged on the three guide wheel frames, and the gas nozzles are matched with the pipe wall of the base pipe in an equal clearance way.

The sand blasting and spraying integrated device for the porous metal coating on the surface of the metal pipe fitting has reasonable structural design, can finish sand blasting and spraying operation at one time, has high spraying efficiency and good spraying effect, reduces the structural size of the device and occupies small area; the base pipe supporting mechanism and the base pipe clamping operation driving mechanism replace a manual overturning supporting mechanism, so that the labor is saved; the powder flame spray gun moving trolley device is eliminated, the powder flame spray gun is of a fixed structure, and is always fixed in the spraying process, so that the centering of the fuel flow center of the powder flame spray gun and the axis of the base pipe is effectively ensured, and the spraying efficiency and the spraying layer quality are improved; the support distance of the spraying part is small, so that the uniformity of the coating is greatly improved, and the spraying efficiency and the coating quality are improved; when the base pipe rotates and moves axially, one end is a free end, no axial tensile stress exists, the circumferential torsional deformation is very small, the residual stress of the coating is very small, and the binding force of the coating is high; after the base pipe is clamped, the base pipe is driven by the electric trolley to rotate and axially move along the supporting rail, the interval time from sand blasting to spraying of the base pipe is short, the passivation of the sand blasting surface is small, and the binding force of the coating is effectively improved; the device has no secondary clamping during spraying, and the work efficiency is improved. Meanwhile, the device is not limited to the base pipes with the same circumferential cross section size, and is also applicable to the pipe types with different circumferential sizes such as the zoom pipe and the node pipe.

Drawings

FIG. 1 is a schematic diagram of the structure of the present invention;

FIG. 2 is a top view of the present invention;

FIG. 3 is a schematic view of the structure of the electric cart of the present invention;

FIG. 4 is a schematic view of the structure of the sandblasting booth according to the present invention;

FIG. 5 is an enlarged view of portion A of FIG. 4;

FIG. 6 is a schematic view of the powder flame spray gun of the present invention;

FIG. 7 is a side view of the powder flame spray gun of the present invention;

FIG. 8 is a schematic view of a base pipe support mechanism according to the present invention;

FIG. 9 is a side view of FIG. 8;

FIG. 10 is a schematic diagram of a fixture structure;

FIG. 11 is a schematic view of the structure of the gas cap support device;

FIG. 12 is a side view of FIG. 11;

fig. 13 is a top view of fig. 11.

Detailed Description

As shown in figures 1-3, the sand blasting and spraying integrated device for the porous metal coating on the surface of the metal pipe fitting is composed of a sand blasting section and a spraying section which are in continuous alignment.

The device is characterized in that a plurality of straight-line base pipe supporting mechanisms 2 and a base pipe clamping operation driving mechanism 3 are arranged on a support rail 1 at intervals in a straight line, wherein two parallel rails 7 are arranged on the support rail 1, a plurality of straight-line base pipe supporting mechanisms 2 extending to a space between the two rails are fixed on one side of the support rail at intervals, an electric trolley 8 for riding is arranged on the two rails 7, a driving motor 9 is arranged on the electric trolley 8, a driving gear of the driving motor 9 is meshed with a rack on the rails 7, and a base pipe connecting clamp 10 is arranged at the front end of the electric trolley 8, so that the base pipe clamping operation driving mechanism 3 is formed. A spraying box 4 is arranged at the tail end of the support rail 1, a spraying rack 5 is arranged behind the spraying box 4 in parallel, a dust hood 28 is arranged at the upper part of the spraying box 4, and a smoke exhaust hood 33 is arranged at the upper part of the spraying rack 5 and is connected with a smoke exhaust pipe 34 to a chimney 36 through a draught fan 35; the back of the spraying rack 5 is provided with a gas cap supporting device 60 which is in the same line with the base pipe supporting mechanism 2, supporting piers 6 are arranged below the base pipe supporting mechanism 2 and the gas cap supporting device 60, and the gas cap supporting device 60 and the base pipe supporting mechanism 2 are in the same line and the same height.

The base pipe support mechanism 2 and the air-head support device 60 form effective support for the base pipe 16 which moves axially and rotationally, so that radial runout of the elongated base pipe 16 during rotation is reduced, and stable operation of the sand blasting and spraying unit is ensured.

The driving gear of the driving motor 9 rotates to drive the electric trolley 8 to longitudinally feed along the rack on the track 7, so that the longitudinal movement of the electric trolley 8 is realized, and the longitudinal movement speed is 0.6-0.8m/s. The rotating motor at the front end of the electric trolley 8 drives the base pipe connecting clamp 10 to rotate, and the base pipe connecting clamp 10 drives the base pipe 16 to rotate at the rotating speed of 60-100rpm.

As shown in fig. 4-5, the middle part of the sand blasting box 4 arranged at the tail end of the track 7 is provided with a sand blasting chamber 25, a base pipe 16 passes through the sand blasting chamber 25, the lower part of the sand blasting box 4 is connected with a sand feeding hopper 11, a sand suction pipe 12 at the bottom of the sand feeding hopper 11 is connected with the root part of a sand blasting gun 13, a high-pressure air line 14 is connected with the tail part of the sand blasting gun 13, a sand blasting nozzle 15 of the sand blasting gun 13 is radially aligned with the axis of the base pipe 16 penetrating through the sand blasting box 4, a dust hood 28 is arranged at the upper part of the sand blasting box 4, an air guide duct 29 is connected, and a high-pressure air line 14 at the tail end of the sand blasting nozzle 15 is connected with an air pressure buffer tank 30 and an air compressor 31; the outlet of the air-introducing duct 29 is connected to a dust catcher 70. The cone bottom of the sand feeding hopper 11 is connected with a fine sand groove 38 through a sand leakage screen plate 37, a powder removing screen plate 39 is arranged at the lower opening of the fine sand groove 38, a vibrator 40 is arranged on one side seat of the powder removing screen plate 39, and the side wall of the fine sand groove 38 is connected with a sand suction pipe 12 to a sand blasting gun 13 in a sand blasting box 4. Two sand blasting guns 13 are arranged in the sand blasting box 4, the sand blasting guns 13 are provided with adjusting brackets 41 which are fixed on the rear wall of the sand blasting box 4, and the front wall of the sand blasting box 4 is provided with a sand box door.

During operation, sand materials in the sand box flow into the sand feeding hopper 11 through the sand separating disc under the action of gravity, sand is sucked into the sand blasting gun 13 by the negative pressure of the sand sucking pipe 12, and is sprayed out at a certain speed after being mixed with compressed air, so that an oxide film on the surface of the base pipe 16 is removed through the impact with the surface of the base pipe 16, and a roughening effect is generated on the surface of the base pipe 16, so that a surface meeting the requirements is provided for spraying, the sand materials in the sand blasting box 4 can be automatically recycled all the time before the sand materials are consumed, and the problem that excessive sand and fine sand of the traditional sand box accumulate and need to be stopped for sand washing is avoided.

The sand blasting side supporting mechanism of the base pipe 16 is an automatic control mechanism, when the electric trolley 8 approaches, the upper limiting wheel rotates for a certain angle, then the upper limiting wheel descends for a certain height together with the electric trolley, and the mechanism completely replaces a manual overturning supporting mechanism for driving the electric trolley to pass through a yielding channel, so that the manual overturning supporting mechanism is saved.

As shown in fig. 6-7, the base pipe 16 transversely passes through the upper part of the spraying bench 5, more than one powder flame spray gun 17 is arranged on the spraying bench 5 in parallel, a spray gun movement trolley device is eliminated, the flame spray gun 17 is of a fixed structure, and the flame spray gun 17 is always fixed in the spraying process, so that the centering of the flame flow center of the flame spray gun 17 and the axis of the base pipe 16 is effectively ensured, the spraying efficiency and the spraying layer quality are improved, and the powder loss is increased due to the eccentric flame flow, the proportion of the powder vertically impacting the surface of the base pipe is reduced, and the binding force of the coating is further reduced; the fume exhaust hood 33 is concentrated near the powder flame spray gun 17, the structural size is small, the power of the power part of the device is small, the energy is saved, and the efficiency is high; the powder flame spray guns 17 are divided into a bottoming spray gun 23 (a bottoming layer with higher binding force is formed on the surface of a base pipe) and at least one working layer spray gun 24 (a metal porous coating is formed on the surface of the base pipe), the spray nozzles 22 of each powder flame spray gun 17 are aligned to the axis of the base pipe 16, the tail part of each powder flame spray gun 17 is connected with an acetylene pipe 18 and an oxygen pipe 19, a complex spray gun gas line and a sliding following device of an electric control driving part power line are omitted, the structure is simplified, the failure rate of the device is reduced, a metal powder tank 20 communicated with the spray gun is arranged on the side wall of a neck section of the powder flame spray gun 17, the neck section is a feeding section, the lower part of the feeding section is connected with a material mixing combustion section 21 until the flame spray nozzles 22 of the powder flame spray gun 17, and the bottoming spray gun 23 and the working layer spray gun 24 are fixed on a bottom bracket 32.

The fuel gas required by the powder flame spray gun 17 is distributed into a flowmeter through an oxygen distribution valve and an acetylene distribution valve, and then enters the powder flame spray gun 17 through a gas pipeline; after ignition, the powder flame spray gun 17 forms heating fuel flow, a powder feeding valve and powder feeding gas of the powder flame spray gun 17 are opened, powder is fed out through a powder outlet hole of the flame spray nozzle 22, is heated and accelerated to spray to the surface of the base pipe 16 through the fuel flow, and is continuously accumulated on the surface of the base pipe 16 by mechanical hooking and micro-metallurgical bonding, so that the metal porous coating is formed.

Firstly, igniting the priming spray gun 23 at the non-working position, adjusting parameters, rapidly rotating to the working position (the central line of the fuel flow points to the axis of the base pipe 16), and spraying a priming layer on the surface of the base pipe 16; then sequentially adjusting the first and second working layer spray guns 24 at the non-working position, and quickly rotating the working layer spray guns 24 to the working position (the central line of the combustion flow points to the axis of the base pipe) when the bottoming layer position of the base pipe 16 arrives; when reaching the spraying end position of the base pipe 16, the powder flame spray gun 17 is lifted and closed in sequence; the air-cap support (as shown in figures 11-13) is arranged at the outlet of the spraying rack 5, the surface of the sprayed metal pipe adopts an air-cap support structure, is in flexible contact, has no damage to the surface of the coating, greatly protects the sprayed coating, has small supporting spacing (the supporting spacing is only 0.8 m) at the spraying position, can control radial runout of the base pipe 16 within +/-1 mm, greatly improves the uniformity of the coating, improves the spraying efficiency and the coating quality, has a free end at one end and no axial tensile stress and has very small circumferential torsion deformation when the base pipe 16 rotates and moves axially, so that the residual stress of the coating is very small and the binding force of the coating is high; the base pipe 16 stops axially feeding and rotating, the supporting air top stops supplying air, the upper limit is opened, the sprayed base pipe 16 is taken out of the supporting frame, and the spraying operation is completed.

The air-cap supporting device 60 is, as shown in fig. 11-13, arranged behind the spraying bench 5 and is in the same line with the base pipe supporting mechanism 2, and the air-cap supporting device 60 and the base pipe supporting mechanism 2 are in the same line and the same height.

The air-jacking supporting device 60 is composed of a supporting rod 61, a supporting frame 62, a left supporting guide wheel II 63, a right supporting guide wheel II 64 and an upper limiting guide wheel II 66, wherein the supporting frame 62 is transversely fixed on the supporting rod 61, two wheel frames 67 are vertically fixed on the supporting frame 63 symmetrically on two sides of the supporting rod 61, the left supporting guide wheel II 63 and the right supporting guide wheel II 64 are respectively assembled at the upper ends of the two lower wheel frames 67, a steering motor 68 is vertically fixed on the right side of the supporting frame 62, an upper limiting guide wheel supporting rod 69 is linked with an output shaft of the steering motor 68, an upper limiting guide wheel II 66 is assembled at the transverse end of the upper limiting guide wheel supporting rod 69, the left supporting guide wheel II 63, the right supporting guide wheel II 64 and the upper limiting guide wheel II 66 are formed into a regular triangle and surround the base pipe 16 in an equal gap mode, the left supporting guide wheel II 63, the right supporting guide wheel II 64 and the upper limiting guide wheel II 66 are positioned on the periphery of the base pipe 16 at an angle of 120 degrees, and meanwhile the axes of the left supporting guide wheel II 63, the right supporting guide wheel II 64 and the upper limiting guide wheel II 66 form an angle of 10-30 degrees with the axis of the base pipe 16 in all directions. Three gas nozzles 71 perpendicular to the axis of the base pipe 16 are provided on each of the three guide frames, and the gas nozzles 71 are fitted to the wall of the base pipe 16 with equal gaps. The gas supply pipes 72 of the three gas nozzles 71 in this apparatus are all connected to the same gas supply means.

As shown in fig. 8-9, the middle base pipe supporting mechanism 2 of the device is composed of an air cylinder 42, an air cylinder fixing frame 43, a wheel seat 44, a left supporting guide wheel I45, a right supporting guide wheel I46 and an upper limiting guide wheel I47, as shown in fig. 8-9, the air cylinder 42 is vertically fixed on the air cylinder fixing frame 43, the wheel seat 44 is transversely fixed on an air cylinder ejector rod 48 of the air cylinder 42, two wheel frames 49 are symmetrically and vertically fixed on the wheel seat 44 at two sides of the air cylinder ejector rod 48, a left supporting guide wheel I45 and a right supporting guide wheel I46 are respectively assembled at the upper ends of the two wheel frames 49, a steering motor 50 is vertically fixed on the right side of the wheel seat 44, an upper limiting guide wheel supporting rod 51 is linked with an output shaft of the steering motor 50, an upper limiting guide wheel I47 is assembled at the transverse end of the upper limiting guide wheel supporting rod 50, and the left supporting guide wheel I45, the right supporting guide wheel I46 and the upper limiting guide wheel I47 are positioned at 120 degrees around the base pipe 16; the axes of the left supporting guide wheel I45, the right supporting guide wheel I46 and the upper limiting guide wheel I47 form an included angle of 10-30 degrees with the axis of the base pipe 16 in all directions; the upper limit guide wheel I47 is a movable positioning mechanism which uses the upper limit guide wheel supporting rod 51 as a shaft to drive steering. Simultaneously, the left support guide wheel I45, the right support guide wheel I46 and the upper limit guide wheel I47 are all arranged on the same plane of the circumference of the base pipe 16, and the middle of the base pipe 16 is penetrated by the left support guide wheel I45, the right support guide wheel I46 and the upper limit guide wheel I47 in a triangular mode. The three-wheel limiting mechanism for the supporting mechanism can effectively restrict radial runout of the base pipe during rotation, so that sand blasting and spraying effects are guaranteed.

When the driving trolley approaches the supporting mechanism, the upper limit guide wheel I47 and the upper limit guide wheel supporting rod 51 rotate for a certain angle under the drive of the steering motor 50 and then integrally move downwards along with the whole supporting frame under the drive of the air cylinder 42 so as to drive the trolley to pass through without barriers.

As shown in fig. 10, the base pipe connecting clamp 10 of the device is composed of a sleeve seat 52, a traction cone 53, a pull rod 54, an operation screw disc 55 and a pulling claw 56, wherein the traction cone 53 and the pull rod 54 are coaxial and integrated, the pull rod 54 penetrates through the sleeve seat 52 and is in clearance fit, an expansion joint 57 is sleeved between a shoulder at the inner side of the traction cone 53 and the end of the sleeve seat 52, the pulling claw 56 is symmetrically arranged at the tail end of the pull rod 54, the pulling claw 56 penetrates through a strip hole 59 at the rear end of the sleeve seat 52, the outer opening of the operation screw disc 55 is abutted against the end face of the pulling claw 56, the traction cone 53 is inserted into a port of the base pipe 16, the expansion joint 57 on the rod of the traction cone 53 is pulled by the pull rod 54 to be expanded with the inner wall of the base pipe 16, a flange 58 integrated with the traction cone is arranged at the tail end of the sleeve seat 52, and the flange 58 is connected with the electric trolley 8. The device adopts the cooperation of the operation screw disc, the pull rod, the slide rod and the expansion joint to fix the base pipe, and has simple structure and difficult fault occurrence; when the base pipe rotates and moves axially, one end of the base pipe is a free end, no axial tensile stress exists, and the circumferential torsional deformation is very small, so that the residual stress of the coating is very small, and the binding force of the coating is high.

The device is a sand blasting and spraying integrated device, and can finish sand blasting and spraying operation at one time. After the base pipe 16 is clamped, the base pipe is driven by the electric trolley 8 to rotate and axially move along the rail 7, after entering the sand blasting box 4, under the action of sand sprayed by the sand blasting nozzle 15, the oxide film on the surface of the base pipe 16 is removed, the surface is roughened, the interval time from sand blasting to spraying of the base pipe 16 is short, the passivation of the sand blasting surface is small, the binding force of a coating is effectively improved, after the base pipe 16 directly enters a spraying position, a metal porous coating is formed on the surface of the base pipe 16 by the combined action of the fixed priming spray gun 23 and the working layer spray gun 24, and the device has no secondary clamping when spraying, so that the working efficiency is improved; the base pipe 16 forming the coating part is supported by the air-cap bracket to continue rotating and axially moving until the spraying is finished; the air pressure buffer tank 30 and the air compressor 31 supply air for the sand blasting gun 13 and the air top supporting device; the fume exhaust hood 33 is connected with the fume exhaust pipe 34 and is responsible for collecting and discharging fume generated by the powder flame spray gun 17 through a draught fan 35 to a chimney 36; compared with the prior operation device, the system has the advantages that the structural size is reduced, and the occupied area is greatly reduced; the device has low reconstruction cost, and when the ultra-long tube is sprayed, only the support and the lengthened track are needed to be added, and other parts are unchanged; the device is slightly modified, so that the device can be suitable for coating operations of other kinds of coatings on the surface of the slender metal tube.

Claims

1. The sand blasting and spraying integrated device for the porous metal coating on the surface of the metal pipe fitting consists of a sand blasting section and a spraying section which are in continuous alignment, and is characterized in that a plurality of in-line base pipe supporting mechanisms (2) and a base pipe clamping operation driving mechanism (3) are arranged on a support rail (1) at intervals in a straight line, a sand blasting box (4) is arranged at the tail end of the support rail (1), spraying platforms (5) are arranged in parallel behind the sand blasting box (4), and a plurality of pulley supporting piers (6) are arranged on the support rail (1) in the same straight line with the base pipe supporting mechanisms (2); the base pipe supporting mechanism (2) is composed of an air cylinder (42), an air cylinder fixing frame (43), a wheel seat (44), a left supporting guide wheel I (45), a right supporting guide wheel I (46) and an upper limiting guide wheel I (47), wherein the air cylinder (42) is vertically fixed on the air cylinder fixing frame (43), the wheel seat (44) is transversely fixed on an air cylinder ejector rod (48) of the air cylinder (42), two wheel frames (49) are symmetrically and vertically fixed on the wheel seat (44) on two sides of the air cylinder ejector rod (48), the left supporting guide wheel I (45) and the right supporting guide wheel I (46) are respectively assembled at the upper ends of the two wheel frames (49), a steering motor (50) is vertically fixed on the right side of the wheel seat (44), an upper limiting guide wheel supporting rod (51) is arranged on an output shaft of the steering motor (50), the transverse end head of the upper limiting guide wheel supporting rod (50) is assembled with the upper limiting guide wheel I (47), and the left supporting guide wheel I (45), the right supporting guide wheel I (46) and the upper limiting guide wheel I (47) form a triangle to clamp the middle penetrating base pipe (16).

2. The integrated device for sand blasting and spraying of the porous metal coating on the surface of the metal pipe fitting according to claim 1 is characterized in that two parallel rails (7) are arranged on a support rail (1), a plurality of straight base pipe supporting mechanisms (2) extending to a space between the two rails are fixed on one side of the rails at intervals, an electric trolley (8) which rides is arranged on the two rails (7), a driving motor (9) is arranged on the electric trolley (8), a driving gear of the motor (9) is meshed with a rack on the rails (7), and a base pipe connecting clamp (10) is arranged at the front end of the electric trolley (8), so that the base pipe clamping operation driving mechanism (3) is formed.

3. The integrated device for sand blasting and spraying the porous metal coating on the surface of the metal pipe fitting according to claim 2, characterized in that the sand blasting box (4) arranged at the tail end of the track (7) is formed by connecting a sand suction pipe (12) at the bottom of a sand feeding hopper (11) to the root part of a sand blasting gun (13), connecting a high-pressure air line (14) to the tail part of the sand blasting gun (13), and radially aligning a sand blasting nozzle (15) of the sand blasting gun (13) with the axis of a base pipe (16) penetrating through the sand blasting box (4).

4. The integrated device for sand blasting and spraying of the porous metal coating on the surface of the metal pipe fitting according to claim 1, wherein the middle part of the sand blasting box (4) is a sand blasting chamber (25), a base pipe (16) passes through the sand blasting chamber (25), and a sand blasting nozzle (15) is aligned with the axis of the base pipe (16); the lower part of the sand spraying box (4) is connected with a sand feeding hopper (11), and a sand suction pipe (12) at the bottom of the sand feeding hopper is connected with a sand spraying gun (13); the upper part of the sandbox (4) is provided with a dust hood (28) and a connecting air guide duct (29); the high-pressure air line (14) at the tail end of the sand blasting nozzle (15) is connected to the air pressure buffer tank (30) and the air compressor (31).

5. The integrated device for sand blasting and spraying of the porous metal coating on the surface of the metal pipe fitting according to claim 1 is characterized in that more than one powder flame spray gun (17) is arranged on the spraying rack (5) in parallel, the tail part of the powder flame spray gun (17) is connected with an acetylene gas pipe (18) and an oxygen pipe (19), a metal powder tank (20) communicated with the spray gun is arranged on the side wall of the neck section of the powder flame spray gun (17), the neck section is a feeding section, and the lower part of the feeding section is connected with a material mixing combustion section (21) until the flame nozzle (22) of the powder flame spray gun (17).

6. The integrated device for sand blasting and spraying of porous metal coating on metal pipe surfaces according to claim 5, characterized in that the powder flame spray guns (17) on the spraying rack (5) are divided into a bottoming spray gun (23) and at least one working layer spray gun (24), and the spray nozzles (22) of each powder flame spray gun (17) are aligned with the axis of the base pipe (16).

7. The integrated device for sand blasting and spraying of the porous metal coating on the surface of the metal pipe fitting according to claim 5, characterized in that a base pipe (16) transversely penetrates through the upper part of the spraying rack (5), a priming spray gun (23) and a working layer spray gun (24) which are arranged in parallel are fixed on a bottom bracket (32), and flame nozzles (22) are aligned with the axis of the base pipe (16) one by one; the upper part of the spraying rack (5) is provided with a smoke exhaust hood (33) which is connected with a smoke exhaust pipe (34) to a chimney (36) through a draught fan (35).

8. The sand blasting and spraying integrated device for the porous metal coating on the surface of the metal pipe fitting according to claim 2 is characterized in that the base pipe connecting clamp (10) consists of a sleeve seat (52), a traction cone (53), a pull rod (54), an operating screw disc (55) and a pusher dog (56), wherein the traction cone (53) and the pull rod (54) are coaxially integrated, the pull rod (54) penetrates through the sleeve seat (52) and is in clearance fit, an expansion joint (57) is sleeved between a shoulder at the inner side of the traction cone (53) and the end head of the sleeve seat (52), the tail end of the pull rod (54) is symmetrically provided with a pusher dog (56), the pusher dog (56) penetrates through a strip hole (59) of the sleeve seat (52), the outer opening of the operation screw disc (55) is propped against the end face of the pusher dog (56), the traction cone (53) is inserted into the port of the base pipe (16), the traction cone (53) is pulled by the pull rod (54) and an expansion joint (57) on the rod is expanded with the inner wall of the base pipe (16), the tail end of the sleeve seat (52) is provided with a flange (58) integrated with the sleeve seat, and the flange (58) is connected with the electric trolley (8).

9. The integrated device for sand blasting and spraying of the porous metal coating on the surface of the metal pipe fitting according to claim 1 is characterized in that an air-roof supporting device (60) which is in the same straight line with a base pipe supporting mechanism (2) is arranged at the rear of a spraying rack (5), the air-roof supporting device (60) is composed of a supporting rod (61), a supporting frame (62), a left supporting guide wheel II (63), a right supporting guide wheel II (64) and an upper limiting guide wheel II (66), the supporting frame (62) is transversely fixed on the supporting rod (61), two wheel frames (67) are symmetrically fixed on the supporting frame (62) at two sides of the supporting rod (61), a left supporting guide wheel II (63) and a right supporting guide wheel II (64) are respectively assembled at the upper ends of the two lower wheel frames (67), a steering motor (68) is vertically fixed on the right side of the supporting frame (62), an upper limiting guide wheel supporting rod (69) is arranged on an output shaft of the steering motor (68), an upper limiting guide wheel supporting rod (69) is assembled at the transverse end of the upper limiting guide wheel II (66), and the left supporting guide wheel II (63), the right supporting guide wheel II (64) and the upper limiting guide wheel II (66) are symmetrically arranged on the right side of the supporting frame (62) to form a right triangle, and the right limiting guide wheel II (66) and the right side and the right limiting guide wheel 16 is surrounded by the base pipe. Three gas nozzles (71) perpendicular to the axis of the base pipe (16) are arranged on the guide wheel frames of the upper limit guide wheel II (66), the left support guide wheel II (63) and the right support guide wheel II (64), and the gas nozzles (71) are in equal clearance fit with the pipe wall of the base pipe (16).