Components and process for shot blasting the inner and outer walls of steel pipes

Abstract

The invention relates to a component and process for shot blasting the inner and outer walls of a steel pipe, which comprises a conveying flat car I, a driven roller frame, an outer wall shot blasting mechanism, an inner wall shot blasting mechanism and a dust removal system; the conveying flat car I is used to transport a workpiece to a shot blasting station; the workpiece is a sleeve body with both the inner and outer sides being in a rotating form; at the shot blasting station, the workpiece is driven to rotate by the roller frame and driven forward by the conveying flat car I; the dust removal system comprises a dust removal part I for the outer wall shot blasting mechanism and a dust removal part II for the inner wall shot blasting mechanism. The invention has reasonable design, compact structure and is easy to use.

Description

Technical Field

[0001] The invention relates to a component and a process for shot blasting cleaning of inner and outer walls of a steel pipe. Background Art

[0002] At present, it is a difficult problem to clean the inner and outer walls of large-diameter pipes. Common treatment methods of the present invention are internal sandblasting, external shot blasting or sandblasting, and internal and external shot blasting.

[0003] The use of internal and external sandblasting can effectively clean the surface, but its cleaning speed is slow, manual operation is required, dust overflow is serious, and the sand and shot in the tube must be cleaned again, wasting cleaning time. Even if the external shot blasting method is used, the production rhythm is still reduced due to the need for separate internal cleaning and the speed of cleaning.

[0004] Although the use of internal and external shot blasting is an excellent cleaning method, at present, what can be seen on the market is a combination of a fully enclosed steel pipe outer wall shot blasting machine + a semi-open steel pipe inner wall hydraulic shot blasting machine for cleaning. Its fully enclosed steel pipe outer wall shot blasting machine completely radially wraps the outer wall of the steel pipe inside the equipment. Although this has a good sealing effect, its equipment is huge and bloated, and requires a large floor space. Its internal semi-open steel pipe inner wall hydraulic shot blasting machine will inevitably cause some energy loss during the conversion of its electric and hydraulic drives. Its semi-open structure (one side of the workpiece is located in the negative pressure shot suction chamber) is very likely to cause insufficient shot suction pressure when the diameter of the steel pipe is too large, causing empty suction, resulting in the projectile remaining inside the steel pipe. Because the shot blaster is hydraulically driven, when there is oil leakage at its driving oil pipe or joint, the oil droplets dripping into the pipe will cause pollution to the pipe wall. If it is not cleaned up properly, it will easily affect the subsequent processes.

[0005] At the same time, a fully enclosed steel pipe outer wall shot blasting machine + a semi-open steel pipe inner wall hydraulic shot blasting machine are used. The fully enclosed steel pipe outer wall shot blasting machine is a cleaning method in which the steel pipe rotates in a spiral line while moving forward and rotating. The semi-open steel pipe inner wall hydraulic shot blasting machine is a cleaning method in which the steel pipe is rolling and rotating while the inner wall hydraulic shot blaster slowly withdraws. In other words, a steel pipe cannot complete the internal and external cleaning of the steel pipe at the same time. The steel pipe needs to be cleaned from the inner wall before it can be turned to the outer wall for cleaning, which increases the cleaning time. At the same time, this solution also requires users to make a pit foundation for the equipment, which adds an economic burden to users.

[0006] Therefore, a device that can simultaneously clean the inner and outer walls of steel pipes is an urgent need of the market and demanders. Summary of the invention

[0007] The technical problem to be solved by the present invention is generally to provide a steel pipe inner and outer wall shot blasting cleaning machine and process. Parent case: CN202110978118.1 Steel pipe inner and outer wall shot blasting cleaning machine and process, application date: 20210825.

[0008] To solve the above problems, the technical solution adopted by the present invention is:

[0009] A steel pipe inner and outer wall shot blasting cleaning machine and process, comprising a conveying flat car I, a driven roller frame, an outer wall shot blasting mechanism, an inner wall shot blasting mechanism and a dust removal system;

[0010] Conveying flat car I is used to transport the workpiece to the shot peening station; the workpiece is a sleeve body with both the inside and outside rotating;

[0011] At the shot peening station, the workpiece is driven to rotate by the roller frame and driven forward by the conveyor flat car I;

[0012] The dust removal system comprises a dust removal part I for the outer wall shot blasting mechanism and a dust removal part II for the inner wall shot blasting mechanism.

[0013] As a further improvement of the above technical solution:

[0014] The outer wall shot blasting mechanism includes a supporting frame, a semi-enclosed shot blasting chamber I, a shot collecting hopper I, a shot blasting machine I, an elevator I, a separator I, a shot material control valve I, a mobile flat car II, a flat car guide rail and a reciprocating driving cylinder;

[0015] One end of the reciprocating driving cylinder is connected to the moving flat car II and drives the moving flat car II to move on the flat car guide rail;

[0016] The flat car guide rail is set on one side of the shot peening station, and the mobile flat car II runs on the flat car guide rail; the supporting frame is on the mobile flat car II;

[0017] The hoist I is on the support frame, the upper output end of the hoist I is connected with the input end of the separator I, and the lower output end of the separator I is provided with a shot control valve I; the output end of the shot control valve I is connected with a shot blasting machine I, and the output end of the shot blasting machine I is provided with a semi-enclosed shot blasting chamber I located at the shot blasting station, and the sealing lip of the semi-enclosed shot blasting chamber I is conformed according to the corresponding outer wall of the workpiece; the sealing lip includes a rear baffle and a front baffle; the front baffle is arranged along the contact tangent direction of the outer wall of the workpiece, and the rear baffle is arranged along the contact normal line direction of the outer wall of the workpiece; a contoured side plate is connected between the rear baffle and the front baffle; and a flexible sealing member is provided on the sealing lip;

[0018] The shot collecting hopper I is located below the semi-enclosed shot blasting chamber I and is used to recover the shots and send them to the input end of the elevator I;

[0019] A dust removal part I is provided on the top of the semi-enclosed shot blasting chamber.

[0020] The inner wall shot blasting mechanism comprises a support seat arranged at the shot blasting station; a root of one end of a cantilever frame is fixed on the support seat or hinged through an internal hinged tail seat; a shot blasting machine II is arranged at the cantilever end of the cantilever frame; a semi-enclosed shot blasting chamber II is connected to the output end side of the shot blasting machine II; the lip of the semi-enclosed shot blasting chamber II is used to contact with the inner wall of the workpiece to form an inner shot blasting cavity; a shot collecting hopper II is arranged at the lower end of the semi-enclosed shot blasting chamber II, and a shot supply screw conveyor and a shot collecting screw conveyor are respectively arranged on the upper and lower sides of the cantilever frame;

[0021] The lower end of the shot collecting hopper II is connected to the input end of the shot collecting screw conveyor, and the shot supply screw conveyor is directly or indirectly connected to the output end of the shot collecting screw conveyor and the input end of the shot blasting machine II respectively to circulate the projectiles;

[0022] The lower end of the elevator II is arranged on the pill collecting screw conveyor, the upper end of the elevator II is connected with the separator II, and the lower end of the separator II is arranged with a pill storage hopper; the lower end of the pill storage hopper is arranged with a pill control valve II, and the pill control valve II is connected with the pill supply screw conveyor;

[0023] There is a dust removal part II on the top of the semi-enclosed shot blasting room II;

[0024] The support seat is fixed on the ground embedded part or can be movably arranged.

[0025] The dust removal system includes a cartridge dust collector, a fan, and a dust removal pipeline; the input end of the dust removal pipeline includes dust removal section I and dust removal section II; the dust-laden gas extracted from the cleaning chamber and the separator reaches the cartridge dust collector through the pipeline, and the dust-removed gas reaches the chimney through the fan and is finally discharged into the air, and the dust emission concentration meets the environmental protection standards;

[0026] A cyclone dust collector is added at the front end of the cartridge dust collector to collect dust, so that the sucked-out pellets can settle and flow back to the cartridge dust collector, and then the dust-laden gas passes through the pipeline to the cartridge dust collector for subsequent treatment;

[0027] The roller frame is arranged on the conveying flat car I, and a driving roller group is arranged on the roller frame for friction rolling contact with both sides of the lower part of the workpiece; the roller frame is provided with an auxiliary elastic supporting ball for elastic contact with the outer side wall of the lower end of the workpiece.

[0028] An inner component head is arranged at the cantilever end of the cantilever frame, and a three-point telescopic top wheel is radially telescopic on the inner component head for rolling contact support with the inner wall of the workpiece.

[0029] An internal dust cleaning head is arranged at the output side of the shot peening station, and an internal spray brush head is arranged outside the internal dust cleaning head; the internal dust cleaning head is used to clean the inner wall of the workpiece after rotary shot peening;

[0030] An internal negative pressure suction head is arranged between the internal spray brush head and the internal dust cleaning head, and an internal drying head is arranged outside the internal spray brush head; the internal dust cleaning head and the internal spray brush head are used to clean the inner wall of the workpiece in turn and then spray anti-rust oil; the internal negative pressure suction head is used to absorb the anti-rust oil to prevent the anti-rust oil from flowing to the shot peening station; the internal drying head is used to dry the anti-rust oil.

[0031] The auger of the pill collecting screw conveyor and / or the auger of the pill supply screw conveyor are located at the cantilever end;

[0032] The pill collecting screw conveyor and the pill supply screw conveyor face one end of the workpiece or face different ends respectively;

[0033] The docking recovery pipe of the shot collecting screw conveyor is supported by the docking traction head, and is used to be supported by the docking traction head to dock with the semi-enclosed shot blasting chamber II;

[0034] The pipeline of the pill collecting screw conveyor and / or the pipeline of the pill supplying screw conveyor is a multi-stage telescopic pipeline.

[0035] On the output side of the shot peening station, an external dust cleaning head and an external spray brush head are arranged in sequence to clean the outer wall of the workpiece and then spray anti-rust oil.

[0036] A process for shot blasting the inner and outer walls of a steel pipe, S1, first, the workpiece is hoisted onto a roller frame; then, the workpiece is driven to roll and move by a conveying flat car I and the roller frame; secondly, the inner wall shot blasting mechanism is inserted into the inner cavity of the workpiece, and the outer wall shot blasting mechanism corresponds to the outer wall of the workpiece; thirdly, steps S2 and S3 are performed simultaneously;

[0037] S2, the outer wall shot blasting mechanism performs shot blasting cleaning on the outer wall of the workpiece;

[0038] S3, the inner wall shot blasting mechanism performs shot blasting cleaning on the inner wall of the workpiece;

[0039] In steps S2 and S3, the dust removal system performs dust removal;

[0040] In step S2, when the workpiece arrives at the shot blasting station, first, the outer wall shot blasting mechanism moves forward along the flat car guide rail under the push of the reciprocating driving cylinder of the mobile flat car II; then, the sealing lip of the semi-enclosed shot blasting chamber I leans against the outer wall of the workpiece to form a shot blasting space; secondly, the shot blaster ejects the projectiles to hit the outer wall of the workpiece, and the splashing projectiles are sealed in the closed space, fall into the shot collecting bucket, and flow into the bottom of the elevator; thirdly, the elevator sends the projectiles to the separator above; thereafter, after being winnowed by the separator, the qualified projectiles enter the shot storage bucket, and then the projectiles are supplied to the shot blaster through the shot material control valve under the shot storage bucket, so as to realize the continuous circulation of the projectiles;

[0041] During this period, the dust is sucked away by the dust removal system through the negative pressure generated by the dust collector and fan of the dust removal part I;

[0042] In step S3, at the shot blasting station, first, the semi-enclosed shot blasting chamber II is attached to the inner wall of the workpiece to form a shot blasting space; then, the shot blasting machine II projects the projectiles to hit the inner wall of the workpiece, and the splashing projectiles are sealed in the closed space and fall into the shot collecting bucket II, and flow into the shot collecting screw conveyor from the bottom, and are sent to the bottom of the elevator II through the shot collecting screw conveyor. The elevator II sends the projectiles to the separator II above. After being air-selected by the separator II, the qualified projectiles enter the shot storage bucket, and then the projectiles are supplied to the shot collecting screw conveyor through the shot material control valve II under the shot storage bucket, and finally sent to the shot blasting machine II, realizing the continuous circulation of the projectiles.

[0043] As a further improvement of the above technical solution:

[0044] During operation, the dust is sucked away through the dust removal part II by the negative pressure generated by the dust collector and the fan.

[0045] In S1, the extension and contraction amount of the auxiliary elastic supporting ball is adjusted according to the elastic supporting force of the outer side wall of the lower end of the workpiece;

[0046] In step S3, after the three-point telescopic top wheel is in place, it radially extends out to roll and contact with the inner wall of the workpiece for support;

[0047] After step S3, execute S4;

[0048] In S4, at the spraying station at the output end of the shot peening station; first, the internal dust cleaning head cleans the inner wall of the workpiece after rotary shot peening; then, the internal negative pressure suction head absorbs the anti-rust oil to prevent the anti-rust oil from flowing to the shot peening station; again, the internal spray brush head cleans the inner wall of the workpiece and then sprays the anti-rust oil; after that, the internal drying head dries the anti-rust oil.

[0049] The present invention has reasonable design, low cost, strong and durable, safe and reliable, simple operation, time-saving and labor-saving, money-saving, compact structure and easy use. The main problem solved by this scheme is that it can complete the cleaning of the inner and outer walls of the steel pipe at the same time, and at the same time, the cleaning equipment is small for the workpieces to be cleaned (especially large workpieces), and no pit foundation is required. On the basis of the existing fully enclosed steel pipe outer wall shot blasting cleaning machine, the present invention makes its cleaning chamber about one-eighth of the size of its original cleaning chamber, and at the same time the overall height of the equipment is reduced by nearly one-sixth. At the same time, this scheme only requires one set of dust removal system (composed of the outer wall shot blasting cleaning mechanism dust removal system and the inner wall shot blasting cleaning mechanism dust removal system, and only one dust collector is required). The whole set of equipment of this scheme uses less materials as a whole, and the manufacturing cost is low. A small amount of design modification can be made to be suitable for pipes of different diameters (especially large diameters).

[0050] During operation, the steel pipe is transported to the position by the workpiece conveying mechanism, and the outer wall shot blasting mechanism moves forward under the push of the cylinder and leans against the outer wall of the steel pipe to form a sealed shot blasting space. The interior of the shot blasting room is treated with anti-strike protection, and the contact part between the shot blasting room and the outer wall of the steel pipe is sealed with flexible wear-resistant materials. During shot blasting, the shot blaster ejects the projectiles to hit the outer wall of the steel pipe, and the splashing projectiles are sealed in the closed space and fall into the bottom hopper, flowing into the bottom of the elevator from the bottom. The elevator sends the projectiles to the separator above. After air separation by the separator, the qualified projectiles enter the shot storage hopper, and then the projectiles are supplied to the shot blaster through the shot control valve under the shot storage hopper, realizing the continuous circulation of the projectiles. A dust removal port is provided on the top of the semi-enclosed shot blasting chamber. During operation, the dust is sucked away by the negative pressure generated by the dust collector and the fan. At the same time, the inner wall shot blasting mechanism leans against the inner wall of the steel pipe to form a sealed shot blasting space. The interior of the shot blasting room is treated with anti-strike protection, and the contact part between the shot blasting room and the inner wall of the steel pipe is sealed with flexible wear-resistant materials. When the shot blasting is working, the shot blaster throws the projectiles to hit the outer wall of the steel pipe. The splashing projectiles are sealed in a closed space, fall into the bottom hopper, flow into the shot collecting screw conveyor from the bottom, and are sent to the bottom of the elevator through the screw conveyor. The elevator sends the projectiles to the separator above. After the separator is air-selected, the qualified projectiles enter the shot storage hopper, and then the projectiles are supplied to the shot supply screw conveyor through the shot control valve under the shot storage hopper, and finally sent to the shot blaster, realizing the continuous circulation of the projectiles. There is a dust removal port on the top of the semi-enclosed shot blasting room. When working, the dust is sucked away by the negative pressure generated by the dust collector and the fan.

[0051] The equipment of this solution is compact and occupies a small area. It can clean the inner and outer walls of the steel pipe at the same time, or clean the inner and outer walls of the steel pipe separately. There is no need for electricity or liquid conversion, and the energy consumption is relatively low. The opening of its semi-enclosed shot blasting chamber fits the pipe wall almost perfectly, and the projectiles splash inside the shot blasting chamber to reduce projectile leakage. At the same time, this solution does not require a pit foundation (only embedded plates and tracks need to be laid when the ground is hardened), reducing the economic burden on users. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is a schematic diagram of the use structure of the present invention.

[0053] Figure 2 It is a schematic diagram of the side structure of the present invention.

[0054] Figure 3 It is a schematic diagram of the top structure of the present invention.

[0055] Figure 4 It is a schematic diagram of the outer wall shot peening structure of the present invention.

[0056] Figure 5 It is a schematic diagram of the use structure of the outer wall shot peening of the present invention from a side view.

[0057] Figure 6It is a schematic diagram of the inner wall shot peening structure of the present invention.

[0058] Figure 7 It is a schematic diagram of the inner wall shot peening structure from the side according to the present invention.

[0059] Figure 8 It is a schematic diagram of the first deformation structure of the present invention.

[0060] Fig. 9 It is a schematic diagram of the second modified use structure of the present invention.

[0061] Among them: 1. Conveying flat car I; 2. Roller frame; 3. Outer wall shot blasting mechanism; 4. Inner wall shot blasting mechanism; 5. Dust removal system; 6. Support frame; 7. Semi-enclosed shot blasting room I; 8. Shot collecting bucket I; 9. Shot blasting machine I; 10. Elevator I; 11. Separator I; 12. Shot material control valve I; 13. Mobile flat car II; 14. Flat car guide rail; 15. Reciprocating drive cylinder; 16. Dust removal part I; 17. Workpiece; 18. Support seat; 19. Cantilever frame; 20. Shot blasting machine II; 21. Semi-enclosed shot blasting room II; 22. Shot collecting bucket II; 23. Shot supply screw conveyor; 24. Shot collecting screw conveyor; 25. Elevator II ; 26. Separator II; 27. Shot control valve II; 28. Dust removal unit II; 29. ​​Shot storage hopper; 30. Driving roller group; 31. Rear baffle; 32. Front baffle; 33. Sealing lip; 34. Internal component head; 35. Three-point telescopic top wheel; 36. Internal dust cleaning head; 37. Internal spray brush head; 38. Internal negative pressure suction head; 39. Internal drying head; 40. Auxiliary elastic supporting ball; 41. External dust cleaning head; 42. External spray brush head; 43. Internal hinged tailstock; 44. Docking recovery pipe; 45. Docking traction head; 46. Multi-stage telescopic pipe. DETAILED DESCRIPTION

[0062] like Figure 1 As shown, the steel pipe inner and outer wall shot blasting cleaning machine and process of this embodiment include a conveying flat car I1, a driven roller frame 2, an outer wall shot blasting mechanism 3, an inner wall shot blasting mechanism 4 and a dust removal system 5;

[0063] The conveying flat car I1 is used to transport the workpiece 17 to the shot peening station; the workpiece 17 is a sleeve body with both the inside and the outside rotating;

[0064] At the shot peening station, the workpiece 17 is driven to rotate by the roller frame 2 and driven forward by the conveyor flat car I1;

[0065] The dust removal system 5 also includes a dust removal section I16 for the outer wall shot blasting mechanism 3 and a dust removal section II28 for the inner wall shot blasting mechanism 4.

[0066] The outer wall shot blasting mechanism 3 includes a support frame 6, a semi-enclosed shot blasting chamber I7, a shot collecting hopper I8, a shot blasting machine I9, an elevator I10, a separator I11, a shot material control valve I12, a mobile flat car II13, a flat car guide rail 14 and a reciprocating drive cylinder 15;

[0067] One end of the reciprocating driving cylinder 15 is connected to the moving flat car II13 and drives the moving flat car II13 to move on the flat car guide rail 14;

[0068] The flat car guide rail 14 is arranged at one side of the shot peening station, and the mobile flat car II13 travels on the flat car guide rail 14; the support frame 6 is on the mobile flat car II13;

[0069] The hoist I10 is on the support frame 6, and the upper output end of the hoist I10 is connected with the input end of the separator I11, and the lower output end of the separator I11 is provided with a shot control valve I12; the output end of the shot control valve I12 is connected with a shot blasting machine I9, and a semi-enclosed shot blasting chamber I7 located at the shot blasting station is provided at the output end of the shot blasting machine I9, and the sealing lip 33 of the semi-enclosed shot blasting chamber I7 is conformed to the corresponding outer wall of the workpiece 17; the sealing lip 33 includes a rear baffle 31 and a front baffle 32; the front baffle 32 is arranged along the contact tangent direction of the outer wall of the workpiece 17, and the rear baffle 31 is arranged along the contact normal line direction of the outer wall of the workpiece 17; a contoured side plate is connected between the rear baffle 31 and the front baffle 32; a flexible sealing member is provided on the sealing lip 33;

[0070] The shot collecting hopper I8 is located below the semi-enclosed shot blasting chamber I7 and is used to recover the shots and send them to the upper input end of the elevator I10;

[0071] A dust removal unit I16 is provided on the top of the semi-enclosed shot blasting chamber I7.

[0072] The inner wall shot blasting mechanism 4 includes a support seat 18 arranged at the shot blasting station; a root of one end of a cantilever frame 19 is fixed on the support seat 18 or hinged through an inner hinged tail seat 43; a shot blasting machine II20 is arranged at the cantilever end of the cantilever frame 19; a semi-enclosed shot blasting chamber II21 is connected to the output end side of the shot blasting machine II20; the lip of the semi-enclosed shot blasting chamber II21 is used to contact the inner wall of the workpiece 17 to form an inner shot blasting cavity; a shot collecting bucket II22 is arranged at the lower end of the semi-enclosed shot blasting chamber II21, and a shot supply screw conveyor 23 and a shot collecting screw conveyor 24 are respectively arranged on the upper and lower sides of the cantilever frame 19;

[0073] The lower end of the pill collecting hopper II22 is connected to the input end of the pill collecting screw conveyor 24, and the pill supplying screw conveyor 23 is directly or indirectly connected to the output end of the pill collecting screw conveyor 24 and the input end of the shot blasting machine II20, respectively, to circulate the projectiles; the lower end of the elevator II25 is provided at the pill collecting screw conveyor 24, the upper end of the elevator II25 is connected to the separator II26, and the lower end of the separator II26 is provided with a pill storage hopper 29; the lower end of the pill storage hopper 29 is provided with a pill material control valve II27, and the pill material control valve II27 is connected to the pill supplying screw conveyor 23;

[0074] A dust removal section II28 is provided on the top of the semi-enclosed shot blasting chamber II21;

[0075] The support base 18 is fixed on the ground embedded part or can be movably arranged.

[0076] The dust removal system 5 includes a filter cartridge dust collector, a fan, and a dust removal pipeline; the input end of the dust removal pipeline includes a dust removal part I16 and a dust removal part II28; the dust-containing gas extracted from the cleaning chamber and the separator reaches the filter cartridge dust collector through the pipeline, and the dust-removed gas reaches the chimney through the fan and is finally discharged into the air, and the dust emission concentration meets the environmental protection standard requirements;

[0077] A cyclone dust collector is added at the front end of the cartridge dust collector to collect dust, so that the sucked-out pellets can settle and flow back to the cartridge dust collector, and then the dust-laden gas passes through the pipeline to the cartridge dust collector for subsequent treatment;

[0078] The roller frame 2 is arranged on the conveying flat car I1, and a driving roller group 30 is arranged on the roller frame 2 for friction rolling contact with both sides of the lower part of the workpiece 17; an auxiliary elastic supporting ball 40 is arranged on the roller frame 2 for elastic contact with the outer wall of the lower end of the workpiece 17.

[0079] An inner component head 34 is provided at the cantilever end of the cantilever frame 19 , and a three-point telescopic top wheel 35 is radially telescopic on the inner component head 34 for rolling contact support with the inner wall of the workpiece 17 .

[0080] An internal dust cleaning head 36 is provided at the output side of the shot peening station, and an internal spray brush head 37 is provided outside the internal dust cleaning head 36; the internal dust cleaning head 36 is used to clean the inner wall of the workpiece 17 after the rotary shot peening;

[0081] An internal negative pressure suction head 38 is arranged between the internal spray brush head 37 and the internal dust cleaning head 36, and an internal drying head 39 is arranged outside the internal spray brush head 37; the internal dust cleaning head 36 and the internal spray brush head 37 are used to clean the inner wall of the workpiece 17 in turn and then spray anti-rust oil; the internal negative pressure suction head 38 is used to absorb the anti-rust oil to prevent the anti-rust oil from flowing to the shot peening station; the internal drying head 39 is used to dry the anti-rust oil.

[0082] The auger of the pill collecting screw conveyor 24 and / or the auger of the pill supplying screw conveyor 23 are located at the cantilever end;

[0083] The pill collecting screw conveyor 24 and the pill supplying screw conveyor 23 face one port of the workpiece 17 or face different ports respectively;

[0084] The docking recovery pipe 44 of the shot collecting screw conveyor 24 is supported by the docking traction head 45, and is used to be supported by the docking traction head 45 to dock with the semi-enclosed shot blasting chamber II21;

[0085] The pipe of the pill collecting screw conveyor 24 and / or the pipe of the pill supplying screw conveyor 23 is a multi-stage telescopic pipe 46. An external dust cleaning head 41 and an external spray brush head 42 are sequentially arranged on the output side of the shot blasting station to clean the outer wall of the workpiece 17 and spray anti-rust oil.

[0086] In the shot blasting cleaning process for the inner and outer walls of the steel pipe of this embodiment, S1, first, the workpiece 17 is hoisted onto the roller frame 2; then, the workpiece 17 is driven to roll and move by the conveying flat car I1 and the roller frame 2; secondly, the inner wall shot blasting mechanism 4 is inserted into the inner cavity of the workpiece 17, and the outer wall shot blasting mechanism 3 corresponds to the outer wall of the workpiece 17; thirdly, steps S2 and S3 are performed simultaneously;

[0087] S2, the outer wall shot blasting mechanism 3 performs shot blasting on the outer wall of the workpiece 17;

[0088] S3, the inner wall shot blasting mechanism 4 performs shot blasting on the inner wall of the workpiece 17;

[0089] In steps S2 and S3, the dust removal system 5 performs dust removal;

[0090] In step S2, when the workpiece 17 arrives at the shot blasting station, first, the outer wall shot blasting mechanism 3 moves forward along the flat car guide rail 14 under the push of the reciprocating driving cylinder 15 of the mobile flat car II13; then, the sealing lip 33 of the semi-enclosed shot blasting chamber I7 leans against the outer wall of the workpiece 17 to form a shot blasting space; secondly, the shot blasting machine I9 projects the projectiles to hit the outer wall of the workpiece 17, and the splashing projectiles are sealed in the closed space, fall into the shot collecting bucket I8, and flow into the bottom of the elevator I10; again, the elevator I10 sends the projectiles to the separator I11 above; thereafter, after being air-selected by the separator I11, the qualified projectiles enter the shot storage bucket, and then the projectiles are supplied to the shot blasting machine I9 through the shot material control valve 12 below the shot storage bucket, so as to realize the continuous circulation of the projectiles;

[0091] During this period, the dust is sucked away by the negative pressure generated by the dust collector and fan of the dust removal part I16 through the dust removal system 5; in step S3, at the shot blasting station, first, the semi-enclosed shot blasting chamber II21 is attached to the inner wall of the workpiece 17 to form a shot blasting space; then, the shot blaster II20 projects the projectiles to hit the inner wall of the workpiece 17, and the splashing projectiles are sealed in the closed space and fall into the shot collecting bucket II22, and flow into the shot collecting screw conveyor 24 from the bottom, and are sent to the bottom of the elevator II25 through the shot collecting screw conveyor 24. The elevator II25 sends the projectiles to the separator II26 above. After being air-selected by the separator II26, the qualified projectiles enter the shot storage bucket 29, and then the projectiles are supplied to the shot collecting screw conveyor 24 through the shot material control valve II27 below the shot storage bucket 29, and finally sent to the shot blaster II20, realizing the continuous circulation of the projectiles.

[0092] During operation, the dust is sucked away through the dust removal part II28 by the negative pressure generated by the dust collector and the fan.

[0093] In S1, the extension and contraction amount of the auxiliary elastic supporting ball 40 is adjusted according to the elastic supporting force of the outer side wall of the lower end of the workpiece 17;

[0094] In step S3, the three-point telescopic top wheel 35 is radially extended to roll and contact with the inner wall of the workpiece 17 for support after it is in place; after step S3, S4 is executed;

[0095] In S4, at the spraying station at the output end of the shot peening station; first, the internal dust cleaning head 36 cleans the inner wall of the workpiece 17 after rotary shot peening; then, the internal negative pressure suction head 38 absorbs the anti-rust oil to prevent the anti-rust oil from flowing to the shot peening station; again, the internal spray brush head 37 cleans the inner wall of the workpiece 17 and then sprays the anti-rust oil; then, the internal drying head 39 dries the anti-rust oil.

[0096] like Figure 1-9 The driving roller group 30 realizes the rotation of the workpiece. The rear baffle 31 and the front baffle 32 are cleverly designed to reduce the resistance of the workpiece to enter, and at the same time realize the cleaning of attached dust. The sealing lip 33 realizes the sealing flexible contact. In order to improve the cantilever structure, a three-point telescopic top wheel 35 is designed on the head 34 of the inner component to realize rolling support, an inner dust cleaning head 36, an inner spray brush head 37, an inner negative pressure suction head 38, an inner drying head 39, an auxiliary elastic supporting ball 40, an outer dust cleaning head 41, and an outer spray brush head 42, thereby realizing cleaning, spraying, and drying, and avoiding the backflow of the anti-rust liquid. The inner articulated tailstock 43 has good compatibility and reduces the requirements for coaxiality. By docking the recovery pipe 44 and the traction head 45, the contact on both sides is realized, which can further adapt to the workpiece with a smaller inner diameter, and the multi-stage telescopic pipe 46 can reduce the cantilever length.

[0097] See Figure 1The present invention mainly comprises: a conveying flat car I (1), a driven roller frame (2), an outer wall shot blasting mechanism (3), an inner wall shot blasting mechanism (4) and a dust removal system (5); the dust removal system (5) can be used for both the outer wall shot blasting mechanism (3) and the inner wall shot blasting mechanism (4);

[0098] The conveying flat car I (1) transports the steel pipe forward and backward, and the driving motor adopts frequency conversion speed regulation. At the same time, a roller frame is installed on the conveying flat car. Under the drive of the roller frame driving motor, the steel pipe realizes rolling operation, and the flat car and the roller frame drive the steel pipe to roll and move. The walking speed of the conveying flat car I (1) can realize stepless speed change; the roller frame (2) is fixed on the conveying flat car I (1), and the lower concept steel pipe as the workpiece (17) is hung on the roller frame (2). Under the drive of the roller frame (2) driving motor, the steel pipe realizes rolling operation, and the conveying flat car I (1) and the roller frame (2) drive the steel pipe to roll and move. The outer wall shot blasting mechanism (3) and the inner wall shot blasting mechanism (4) work simultaneously to realize the simultaneous shot blasting cleaning of the inner and outer walls, with high work efficiency, and one steel pipe can be cleaned in 20 minutes.

[0099] See Figure 2 , Figure 1 The inner and outer wall shot blasting mechanism (3) is mainly composed of a supporting frame (6), a semi-enclosed shot blasting chamber I (7), a shot collecting hopper I (8), a shot blasting machine I (9), an elevator I (10), a separator I (11), a shot material control valve I (12), a movable flat car II (13), a reciprocating driving cylinder (15), and a dust removal part I (16) of the outer wall shot blasting mechanism (3).

[0100] During the working process, the steel pipe is transported to the position by the workpiece conveying mechanism, and the outer wall shot blasting mechanism moves forward under the push of the reciprocating driving cylinder (15) of the mobile flat car II (13), and leans against the outer wall of the steel pipe to form a sealed shot blasting space. The interior of the semi-enclosed shot blasting chamber I (7) is treated with impact resistance protection, and the contact part between the semi-enclosed shot blasting chamber I (7) and the outer wall of the steel pipe is sealed with a flexible wear-resistant material. During the shot blasting operation, the shot blasting machine I (9) ejects the projectiles to hit the outer wall of the steel pipe, and the splashing projectiles are sealed in the closed space and fall into the shot collecting hopper I (8), and flow into the bottom of the elevator I (10) from the bottom. The elevator I (10) sends the projectiles to the separator I (11) above. After being air-selected by the separator I (11), the qualified projectiles enter the shot storage hopper, and then the projectiles are supplied to the shot blasting machine I (9) through the shot material control valve (12) below the shot storage hopper, so as to realize the continuous circulation of the projectiles. A dust removal port is provided on the top of the semi-enclosed shot blasting chamber 1 (7). During operation, dust is sucked away by the dust removal system (5) through the negative pressure generated by the dust collector and the fan.

[0101] See Figure 3 , Figure 1The middle inner wall shot blasting mechanism (4) is mainly composed of a support base (18), a cantilever frame (19), a shot blasting machine II (20), a semi-enclosed shot blasting chamber II (21), a shot collecting hopper II (22), a shot supply screw conveyor (23), a shot collecting screw conveyor (24), an elevator II (25), a separator II (26), a shot material control valve II (27), a dust removal part II (28), a shot storage hopper (29), etc.

[0102] The shot blasting machine II (20) and the semi-enclosed shot blasting chamber II (21) are fixed to the front end of the cantilever frame (19), the rear end of the cantilever frame (19) is fixed to the support seat (18), and the support seat (18) is fixed to the ground embedded part.

[0103] During the working process, the steel pipe is transported by the workpiece conveying mechanism to the semi-enclosed shot blasting chamber II (21) of the inner wall shot blasting mechanism (4) against the inner wall of the steel pipe to form a sealed shot blasting space. The interior of the semi-enclosed shot blasting chamber II (21) is treated with impact resistance protection, and the contact portion between the semi-enclosed shot blasting chamber II (21) and the inner wall of the steel pipe is sealed with a flexible wear-resistant material. During the shot blasting operation, the shot blasting machine II (20) ejects the projectiles to hit the inner wall of the workpiece (17). The flying projectiles are sealed in a closed space and fall into the projectile collecting hopper II (22). They flow into the projectile collecting screw conveyor (24) from the bottom and are sent to the bottom of the elevator II (25) through the projectile collecting screw conveyor (24). The elevator II (25) sends the projectiles to the separator II (26) above. After being air-selected by the separator II (26), the qualified projectiles enter the projectile storage hopper (29). Then, the projectiles are supplied to the projectile collecting screw conveyor (24) through the projectile control valve II (27) below the projectile storage hopper (29), and finally sent to the shot blasting machine II (20), realizing the continuous circulation of the projectiles. A dust removal port is provided at the top of the semi-enclosed shot blasting chamber II (21). During operation, the dust is sucked away by the negative pressure generated by the dust collector and the fan through the dust removal part II (28).

[0104] The cantilever frame (19) is a grid structure formed by welding three seamless steel pipes and inclined profiles. The interiors of the three seamless steel pipes are respectively used as the groove of the pill supply screw conveyor (23), the groove of the pill collection screw conveyor (24) and the exhaust pipe of the dust removal part II (28).

[0105] exist Figure 1 In the embodiment, the dust removal system (5) (composed of the dust removal part I (16) and the dust removal part II (28)) is mainly composed of a filter cartridge dust collector, a fan, a dust removal pipeline, etc. The dust-containing gas extracted from the cleaning chamber and the separator reaches the filter cartridge dust collector through the pipeline, and the dust-removed gas reaches the chimney through the fan and is finally discharged into the air. The dust emission concentration meets the environmental protection standard requirements.

[0106] If there are special requirements, a cyclone dust collector can be added in front of the cartridge dust collector to settle the sucked pellets and return them to the pellet collection system. Then the dust-laden gas passes through the pipeline to the cartridge dust collector for subsequent treatment.

[0107] The present invention is fully described for a clearer disclosure, and the prior art is not listed one by one.

[0108] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some of the technical features therein with equivalents; it is obvious for those skilled in the art to combine multiple technical solutions of the present invention. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A shot blasting cleaning process for inner and outer walls of a steel pipe, characterized in that: With the aid of a dust removal system, the dust removal system includes a filter cartridge dust collector, a fan, and a dust removal pipeline; the input end of the dust removal pipeline includes a dust removal part I (16) and a dust removal part II (28); the dust-containing gas extracted from the cleaning chamber and the separator reaches the filter cartridge dust collector through the pipeline, and the dust-removed gas reaches the chimney through the fan and is finally discharged into the air, and the dust emission concentration meets the environmental protection standard requirements; A cyclone dust collector is added at the front end of the cartridge dust collector to collect dust, so that the sucked-out pellets can settle and flow back to the cartridge dust collector, and then the dust-laden gas passes through the pipeline to the cartridge dust collector for subsequent treatment; A roller frame (2) is arranged on the conveying flat car I (1), and a driving roller group (30) is arranged on the roller frame (2) for friction rolling contact with both sides of the lower part of the workpiece (17); an auxiliary elastic supporting ball (40) is arranged on the roller frame (2) for elastic contact with the outer side wall of the lower end of the workpiece (17); An inner component head (34) is arranged at the cantilever end of the cantilever frame (19), and a three-point telescopic top wheel (35) is radially telescopic on the inner component head (34) for rolling contact support with the inner wall of the workpiece (17); An internal dust cleaning head (36) is arranged at the output side of the shot peening station, and an internal spray brush head (37) is arranged outside the internal dust cleaning head (36); the internal dust cleaning head (36) is used to clean the inner wall of the workpiece (17) after rotary shot peening; An internal negative pressure suction head (38) is arranged between the internal spray brush head (37) and the internal dust cleaning head (36), and an internal drying head (39) is arranged outside the internal spray brush head (37); the internal dust cleaning head (36) and the internal spray brush head (37) are used to sequentially clean the inner wall of the workpiece (17) and then spray anti-rust oil; the internal negative pressure suction head (38) is used to absorb the anti-rust oil to prevent the anti-rust oil from flowing to the shot peening station; the internal drying head (39) is used to dry the anti-rust oil; S1, first, the workpiece (17) is hoisted onto the roller frame (2); then, the workpiece (17) is driven to roll and move by the conveying flat car I (1) and the roller frame (2); secondly, the inner wall shot blasting mechanism (4) is inserted into the inner cavity of the workpiece (17), and the outer wall shot blasting mechanism (3) corresponds to the outer wall of the workpiece (17); thirdly, steps S2 and S3 are performed simultaneously; The inner wall shot blasting mechanism comprises a support seat (18) arranged at a shot blasting station; a root of one end of a cantilever frame (19) is fixed on the support seat (18) or hingedly connected via an internal hinged tail seat (43); a shot blasting machine II (20) is arranged at the cantilever end of the cantilever frame (19); a semi-enclosed shot blasting chamber II (21) is connected to the output end side of the shot blasting machine II (20); a lip of the semi-enclosed shot blasting chamber II (21) is used to contact the inner wall of the workpiece (17) to form an inner shot blasting cavity; a shot collecting bucket II (22) is arranged at the lower end of the semi-enclosed shot blasting chamber II (21), and a shot supply screw conveyor (23) and a shot collecting screw conveyor (24) are respectively arranged on the upper and lower sides of the cantilever frame (19); The lower end of the pill collecting hopper II (22) is connected to the input end of the pill collecting screw conveyor (24), and the pill supplying screw conveyor (23) is directly or indirectly connected to the output end of the pill collecting screw conveyor (24) and the input end of the shot blasting machine II (20) respectively, so as to circulate the pills; The lower end of the pill collecting screw conveyor (24) is provided with an elevator II (25), the upper end of the elevator II (25) is connected with a separator II (26), and the lower end of the separator II (26) is provided with a pill storage hopper (29); a pill material control valve II (27) is provided at the lower end of the pill storage hopper (29), and the pill material control valve II (27) is connected to the pill supply screw conveyor (23); A dust removal section II (28) is provided on the top of the semi-enclosed shot blasting chamber II (21); The support seat (18) is fixed on the ground embedded part or can be movably arranged; the auger of the pill collecting screw conveyor (24) and / or the auger of the pill supplying screw conveyor (23) are located at the cantilever end; The pill collecting screw conveyor (24) and the pill supplying screw conveyor (23) face one port of the workpiece (17) or face different ports respectively; The docking recovery pipe (44) of the shot collecting screw conveyor (24) is supported by the docking traction head (45) and is used to be supported by the docking traction head (45) to dock with the semi-enclosed shot blasting chamber II (21); The pipe of the shot collecting screw conveyor (24) and / or the pipe of the shot supplying screw conveyor (23) is a multi-stage telescopic pipe (46); an external dust cleaning head (41) and an external spray brush head (42) are sequentially arranged on the output side of the shot peening station to clean the outer wall of the workpiece (17) and then spray anti-rust oil; The outer wall shot blasting mechanism comprises a support frame (6), a semi-enclosed shot blasting chamber I (7), a shot collecting hopper I (8), a shot blasting machine I (9), an elevator I (10), a separator I (11), a shot material control valve I (12), a movable flat car II (13), a flat car guide rail (14) and a reciprocating drive cylinder (15); One end of the reciprocating driving cylinder (15) is connected to the moving flat car II (13) and drives the moving flat car II (13) to move on the flat car guide rail (14); A flat car guide rail (14) is provided at one side of the shot peening station, and a movable flat car II (13) travels on the flat car guide rail (14); a support frame (6) is on the movable flat car II (13); The elevator I (10) is on the support frame (6); the upper output end of the elevator I (10) is connected to the input end of the separator I (11); the lower output end of the separator I (11) is provided with a shot control valve I (12); the output end of the shot control valve I (12) is connected to a shot blasting machine I (9); the output end of the shot blasting machine I (9) is provided with a semi-enclosed shot blasting chamber I (7) located at the shot blasting station; the sealing lip of the semi-enclosed shot blasting chamber I (7) The opening (33) is conformed to the corresponding outer wall of the workpiece (17); the sealing lip (33) comprises a rear baffle (31) and a front baffle (32); the front baffle (32) is arranged along the contact tangent direction of the outer wall of the workpiece (17), and the rear baffle (31) is arranged along the contact normal direction of the outer wall of the workpiece (17); a conforming side plate is connected between the rear baffle (31) and the front baffle (32); and a flexible sealing member is arranged on the sealing lip (33); The shot collecting hopper I (8) is located below the semi-enclosed shot blasting chamber I (7) and is used to collect the shots and send them to the upper input end of the elevator I (10); A dust removal section I (16) is provided on the top of the semi-enclosed shot blasting chamber (7); S2, the outer wall shot blasting mechanism (3) performs shot blasting on the outer wall of the workpiece (17); S3, the inner wall shot blasting mechanism (4) performs shot blasting on the inner wall of the workpiece (17); In steps S2 and S3, the dust removal system (5) performs dust removal; In step S2, when the workpiece (17) arrives at the shot blasting station, first, the outer wall shot blasting mechanism (3) is pushed forward along the flat car guide rail (14) by the reciprocating driving cylinder (15) of the mobile flat car II (13); then, the sealing lip (33) of the semi-enclosed shot blasting chamber I (7) is pressed against the outer wall of the workpiece (17) to form a shot blasting space; secondly, the shot blasting machine (9) ejects the projectiles to hit the outer wall of the workpiece (17), and the flying projectiles are sealed in the closed space and fall into the shot collecting bucket (8), and the lower part flows into the bottom of the elevator (10); thirdly, the elevator (10) sends the projectiles to the separator (11) above; thereafter, after being air-selected by the separator (11), the qualified projectiles enter the shot storage bucket, and then the projectiles are supplied to the shot blasting machine (9) through the shot material control valve (12) below the shot storage bucket, so as to realize the continuous circulation of the projectiles; During this period, the dust is sucked away by the dust removal system (5) through the negative pressure generated by the dust collector and fan of the dust removal part I (16); In step S3, at the shot blasting station, first, the semi-enclosed shot blasting chamber II (21) is attached to the inner wall of the workpiece (17) to form a shot blasting space; then, the shot blasting machine II (20) ejects the projectiles to hit the inner wall of the workpiece (17), and the splashed projectiles are sealed in the enclosed space and fall into the shot collecting bucket II (22), and flow from the bottom into the shot collecting screw conveyor (24), and are sent to the bottom of the elevator II (25) through the shot collecting screw conveyor (24). The elevator II (25) sends the projectiles to the separator II (26) above, and after being air-selected by the separator II (26), the qualified projectiles enter the shot storage bucket (29), and then the projectiles are supplied to the shot collecting screw conveyor (24) through the shot material control valve II (27) below the shot storage bucket (29), and finally sent to the shot blasting machine II (20), so as to realize the continuous circulation of the projectiles; A dust removal port is provided on the top of the semi-enclosed shot blasting chamber II (21). During operation, dust is sucked away through the dust removal part II (28) by the negative pressure generated by the dust collector and the fan. In S1, the extension and contraction amount of the auxiliary elastic supporting ball (40) is adjusted according to the elastic supporting force of the outer side wall of the lower end of the workpiece (17); In step S3, after the three-point telescopic top wheel (35) is in place, it is radially extended to roll in contact with the inner wall of the workpiece (17) for support; After step S3, execute S4; In S4, at the spraying station at the output end of the shot peening station; first, the internal dust cleaning head (36) cleans the inner wall of the workpiece (17) after the rotary shot peening; then, the internal negative pressure suction head (38) absorbs the anti-rust oil to prevent the anti-rust oil from flowing to the shot peening station; then, the internal spray brush head (37) cleans the inner wall of the workpiece (17) and sprays the anti-rust oil; then, the internal drying head (39) dries the anti-rust oil.

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