Steel pipe blasting and jetting cleaning system

Abstract

The application discloses a steel pipe cleaning system, which comprises a first line, a second line, a first lateral roller, an outer cleaning device, a first inner cleaning device and a second inner cleaning device. The first line is provided with a first feeding device and a first discharging device. The second line is arranged in parallel with the first line and is provided with a second feeding device and a second discharging device. The first lateral roller is arranged at the front part of the first line and the second line to connect the first line and the second line, so that the workpiece on the current line can be conveyed to the other line while keeping the current position. The outer cleaning device is arranged on the outer surface of the steel pipe. The first inner cleaning device is arranged in the middle of the first line. The second inner cleaning device is arranged in the middle of the second line. The steel pipe cleaning system has high cleaning efficiency and can clean the inner and outer surfaces of the steel pipe.

Description

Technical Field

[0001] This invention relates to a steel pipe blasting and cleaning system. Background Technology

[0002] Steel pipes, as an important industrial material, are widely used in fluid transportation, manufacturing mechanical parts, and containers. Although steel pipes are generally treated with anti-corrosion agents, rust, dirt, and / or oxide layers can easily form on the surface and inner wall of steel pipes during long-term use. These defects not only affect the appearance quality of the steel pipes but may also reduce their performance and lifespan. Therefore, regular or irregular cleaning and rust removal of the surface and inner wall of steel pipes are necessary. Cleaning and rust removal are crucial steps to ensure the normal use of steel pipes.

[0003] The shot blasting or shot peening process for steel pipes is already very mature. However, current cleaning and rust removal methods for the outer surface (also known as the outer wall of the steel pipe) or the inner surface (also known as the inner wall of the steel pipe) of steel pipes are usually specialized. That is, most of them only clean the outer wall or only the inner wall of the steel pipe, and often cannot achieve the cleaning effect of the inner and outer surfaces of the steel pipe in the same line.

[0004] In some implementations, the cleaning of the outer and inner surfaces of steel pipes is combined into one station, meaning the outer surface of the steel pipe is cleaned simultaneously. However, cleaning the outer surface often requires a roller device, with the steel pipe placed on the roller and rotating due to friction. Cleaning the inner surface requires a device that can penetrate the steel pipe to deliver, for example, an internal shot blasting head. This internal shot blasting head is typically rotatable or has multiple nozzles, allowing only axial movement of the steel pipe in the case of internal shot blasting. Therefore, it can be seen that due to different requirements regarding the movement of the steel pipe, there is an efficiency difference between internal and external shot blasting, making it difficult to integrate the two processes. Summary of the Invention

[0005] The purpose of this invention is to provide a shot blasting cleaning system for steel pipes that has high cleaning efficiency and can clean both the inner and outer surfaces of steel pipes.

[0006] According to an embodiment of the present invention, a steel pipe blasting and cleaning system is provided, the basic structure of which includes:

[0007] The first line has a first feeding device and a first unloading device;

[0008] The second line is set in parallel with the first line, and the second line has a second feeding device and a second unloading device;

[0009] The first transverse roller conveyor is used for the front connection between the first line and the second line to transport the workpiece on the current line to the other line while maintaining the current position.

[0010] An external spraying device is used to clean the outer wall of workpieces on the first transverse roller conveyor.

[0011] A first internal polishing device, located in the middle of the first line, is used to clean the inner wall of workpieces transferred from the second line via the first transverse roller conveyor and which have undergone outer wall cleaning; and

[0012] The second internal polishing device is located in the middle of the second line to clean the inner wall of the workpiece that has been transferred from the first line through the first transverse roller conveyor and has undergone outer wall cleaning.

[0013] Optionally, the external spraying device is adapted to the external spraying fixture for the external spraying operation of a set of steel pipes;

[0014] The internal blasting and spraying equipment for the first and second internal blasting and spraying devices is suitable for internal blasting and spraying operations on single steel pipes.

[0015] Optionally, a stacking platform is provided in front of the first internal throwing and spraying device and the second internal throwing and spraying device to receive the steel pipes conveyed by the external throwing and spraying device received by the first line or the second line.

[0016] Furthermore, a stepping feeding device is installed at the end of the stacking workbench.

[0017] Optionally, the stepping feeding device includes:

[0018] The fixed toothed plate is equipped with at least one pair, and the first tooth grooves of the corresponding two or more fixed toothed plates are aligned to cooperate in supporting the steel pipe;

[0019] A lifting toothed plate is arranged parallel to a fixed toothed plate, with the same tooth spacing as the fixed toothed plate and staggered tooth profiles; and

[0020] A lifting device is used to drive the lifting toothed plate to rise and fall. When the lifting toothed plate is in the lower stop position, the steel pipe is supported in the first tooth groove. When the lifting toothed plate is in the upper stop position, the portion of the rear tooth profile of the second tooth groove of the lifting toothed plate that is aligned with the top of the fixed tooth of the corresponding fixed toothed plate is higher than the top of the fixed tooth, so that the steel pipe is lifted up and slides forward into the second tooth groove determined by the current rear tooth profile and the corresponding front tooth profile.

[0021] Optionally, the inclination of the front profile of the second tooth groove is greater than the inclination of the rear profile.

[0022] Optionally, the inclination of the anterior tooth profile is 5 to 9 times that of the posterior tooth profile.

[0023] Optionally, the first internal jetting device and the second internal jetting device are located in the space between the first line and the second line;

[0024] The first internal jetting device and the second internal jetting device are at a given distance in the front-to-back direction.

[0025] Optionally, the first feeding device is used for feeding coarse steel pipes, and the second feeding device is used for feeding fine steel pipes;

[0026] The coarse steel pipe and the fine steel pipe are a pair of concepts with opposite pipe diameters, distinguished according to predetermined specifications.

[0027] Optionally, a long and short steel pipe sorting device is provided in front of the parallel first unloading device and the second unloading device;

[0028] Accordingly, a second transverse roller conveyor is provided to transport the sorted workpieces that do not belong to the current unloading device to another unloading device;

[0029] Accordingly, one of the first unloading device or the second unloading device is used for unloading long steel pipes, and the other is used for unloading short steel pipes.

[0030] Optionally, the first and second lines have a ramp structure in the unloading direction, except for the roller platform.

[0031] The steel pipe shot blasting system according to an embodiment of the present invention employs two parallel lines: a first line with a first feeding device and a first unloading device, and a second line with a second feeding device and a second unloading device. These two lines are arranged in parallel, with a first transverse roller conveyor at the front of each line. Workpieces on both lines maintain their current posture during transfer to the first transverse roller conveyor, thus adapting to, for example, through-type shot blasting of the outer wall of steel pipes. With the aid of the conveying of the first transverse roller conveyor and the adapted external shot blasting device, the outer wall shot blasting of the workpiece is completed while transferring it to the other line. Furthermore, the steel pipe, having undergone external shot blasting, adapts to the workpiece posture corresponding to the internal shot blasting device because its posture remains unchanged, thus enabling internal shot blasting. Therefore, in the embodiments of the present invention, the workpiece is always kept in a uniform posture, satisfying both external shot blasting via the first transverse roller conveyor and internal shot blasting based on the same posture on the line, thereby improving the overall efficiency of steel pipe cleaning. Attached Figure Description

[0032] Figure 1 This is a top view of a steel pipe blasting and cleaning system in one embodiment.

[0033] Figure 2 This is a flowchart of the steel pipe feeding process in one embodiment.

[0034] Figure 3 This is a schematic diagram of the step feeding device in one embodiment.

[0035] In the diagram: 1. Large steel pipe loading rack, 2. First transverse loading device, 3. First conveyor roller conveyor, 4. Tooling return roller conveyor, 5. Outer wall shot blasting main body, 6. First conveyor roller conveyor, 7. Second transverse loading device, 8. Small steel pipe loading rack, 9. Outer wall shot blasting treatment device, 10. Dust removal pipeline, 11. Dust removal fan, 12. Bag filter dust collector, 13. First large steel pipe transition support, 14. Large steel pipe rotating mechanism, 15. Second dust removal system, 16. Large blasting head, 17. Large steel pipe internal blasting main body, 18. Second large steel pipe transition support 19. Steel shot circulation system; 20. Small steel pipe internal throwing device; 21. Workpiece sorting roller conveyor; 22. Large steel pipe discharge device; 23. Small steel pipe discharge device; 24. Small steel pipe transition roller conveyor; 25. Steel pipe; 26. Loading platform; 27. Tooling; 28. Trolley; 29. ​​Unloading platform; 30. Stacking platform; 31. Lifting cylinder; 32. Lifting toothed plate; 33. Integrated motor and reducer; 34. Roller assembly; 35. Rear tooth profile; 36. Stepping tooth groove; 37. Front tooth profile; 38. Fixed tooth; 39. Fixed toothed plate. Detailed Implementation

[0036] For shot blasting lines, the normal flow direction of the workpiece is usually called the front-to-back direction. Within the workpiece flow plane, the direction perpendicular to the front-to-back direction is called the left-to-right direction. The front-to-back direction is also called the longitudinal direction, the length direction, or the head-to-tail direction, while the left-to-right direction is also called the transverse direction, the width direction, or the lateral direction.

[0037] It should be noted that, strictly speaking, the embodiments of the present invention do not propose any improvements to equipment such as shot blasting for cleaning the outer wall of steel pipes and shot blasting for cleaning the inner wall of steel pipes, but only their conventional use. Therefore, the relevant process equipment itself is not described in detail in the embodiments of the present invention, and those skilled in the art can select the relevant process equipment accordingly.

[0038] exist Figure 1 The illustrated structure has two lines. The first line is the line with a small steel pipe feeding rack 8 and a large steel pipe discharge device 22. The second line is the line with a large steel pipe feeding rack 1 and a small steel pipe discharge device 23 arranged in parallel with the first line.

[0039] also, Figure 1 In the illustrated structure, both the large steel pipe discharge device 22 and the small steel pipe discharge device 23 serve as unloading devices, and their downstream process equipment can be, for example, a preheating furnace.

[0040] The concepts of large and small steel pipes are relative, and manufacturers can make appropriate adjustments based on their specific processes.

[0041] In addition, for example, external shot blasting has relatively low requirements for the size of the process object, while for internal shot blasting, the intervention capability of the internal blasting head and the distance between the internal blasting head and the inner pipe wall need to be considered. Therefore, the internal blasting head has requirements for the size of the steel pipe.

[0042] Similarly, since multiple steel pipes 25 are often present simultaneously for shot blasting targets, it is essential to provide a steel pipe shot blasting cleaning system with two lines. Furthermore, as... Figure 1 The steel pipe shot blasting system illustrated in the figure does not mean that the shot blasting of large steel pipes and small steel pipes are carried out at the same time. In fact, steel pipes 25 from the same batch are often of similar diameter, only differing in length. In other words, the steel pipe shot blasting system based on the embodiments of the present invention is usually used to clean either large steel pipes or small steel pipes, rather than cleaning both types of steel pipes simultaneously.

[0043] It should be further noted that shot blasting and sandblasting are both applicable to the steel pipe shot blasting and sandblasting cleaning device provided in the embodiments of the present invention. For ease of description, it is defined as "shot blasting and sandblasting cleaning device" and does not mean that shot blasting and sandblasting operations are performed simultaneously.

[0044] For ease of description, the two lines are defined as the first line and the second line. The first line can be used for shot blasting of large steel pipes, such as large steel pipes, or shot blasting of small steel pipes. The two lines are only used to distinguish between the two lines and do not have any special requirements for the process object.

[0045] Therefore, if the internal shot blasting equipment is adapted to the same type of steel pipe 25, the same batch of steel pipes, such as "large" steel pipes, can be fed from either the first line or the second line.

[0046] Furthermore, as a technical requirement, external shot blasting often requires the steel pipe 25 to rotate around its own axis while simultaneously undergoing axial movement; the commonly used through-type steel pipe external wall shot blasting machine is an example of this type of equipment. In contrast, internal shot blasting allows the steel pipe 25 to be either statically stationary or rotating around its own axis, without requiring axial movement. The internal blasting head of the internal shot blasting device typically performs axial movement within the steel pipe 25 and can also have rotational motion capabilities. Therefore, internal and external shot blasting place different requirements on the movement and orientation of the steel pipe 25. The primary challenge in the embodiments of this invention is to achieve, for example, internal and external shot blasting of the steel pipe 25 on the same equipment while maintaining its orientation, thereby reducing inaccuracies caused by orientation changes and the complexity of equipment configuration.

[0047] Based on the foregoing description, the first line has a first feeding device and a first unloading device, which can be used to feed both large and small steel pipes. If... Figure 1The large steel pipe internal throwing device and the small steel pipe internal throwing device 20 shown in the example have special arrangements, so that they can be adapted to specific lines.

[0048] Accordingly, the second line is arranged in parallel with the first line, and the second line has a second feeding device and a second unloading device.

[0049] exist Figure 1 As seen in the illustrated structure, the large steel pipe feeding rack 1 is used for feeding steel pipes 25. During feeding, the steel pipes are placed horizontally, meaning the axis of the steel pipe 25 is perpendicular to the feeding direction. Similarly, for the small steel pipe feeding rack 8, the steel pipes 25 are also placed horizontally. Under horizontal conditions, shot blasting of the steel pipes 25 is relatively difficult. The transverse roller conveyor provides a way to change the transverse orientation to the longitudinal orientation without adjusting the orientation of the steel pipe 25. Specifically, the transverse roller conveyor, without adjusting the orientation of the longitudinally conveyed steel pipe 25, changes the orientation of the steel pipe 25 to the longitudinal direction of transport, i.e., it becomes longitudinal on the transverse roller conveyor.

[0050] Furthermore, a first transverse roller conveyor is provided, such as Figure 1 The first conveyor roller conveyor 3 shown is used for the front connection between the first line and the second line to convey the workpiece on the current line to the other line while maintaining its current position. The workpiece is the steel pipe 25. The first conveyor roller conveyor 3 can be understood as a bidirectional roller conveyor. If the workpiece is fed from the first line, the steel pipe 25 is conveyed to the second line in front of the first line; conversely, if the workpiece is fed from the second line, the steel pipe 25 is conveyed to the first line in the middle of the second line.

[0051] When the steel pipe 25 is fed from the first or second line, it is arranged horizontally in, for example... Figure 1 On the large steel pipe loading rack 1 or the small steel pipe loading rack 8 shown. Figure 2 In the illustrated structure, the workpieces are placed as evenly as possible on the serrated rack using a crane or other auxiliary lifting tools, and then fed using a stepping feeder or other methods.

[0052] Step-feed feeding is a relatively mature technology in this field. Embodiments of this invention also provide a novel method... Figure 3 The step feeding device shown is for reference only. However, it should be understood that in the embodiments of the present invention, the focus is on the longitudinal and transverse conversion of the steel pipe 25 under non-self-position changing conditions.

[0053] Regarding feeding materials, such as Figure 2In step a, the position of steel pipe 25 is marked as the material rack. Workers can use a lifting tool to place the steel pipes one by one or in groups on the material rack. The material rack can have a certain degree of inclination, such as tilting downwards from the left end to the right end in the figure. Since steel pipe 25 is a rotating body, the angle of inclination should not be too large. Generally, 1° to 3° is sufficient. At this time, steel pipe 25 can be loaded from the left end of the material rack, and steel pipe 25 rolls to the right by its own weight.

[0054] A limiting structure is installed at the right end of the material rack, and the steel pipes are temporarily stored on the material rack.

[0055] exist Figure 2 In steps d to j, it is clearly visible that a serrated fixture is provided at the right end of the material rack. The steel pipes 25 are blocked on the left side of this fixture. The serrated fixture is used to arrange the steel pipes 25 at approximately equal intervals on the fixture. The transfer of the steel pipes 25 from the material rack to the fixture can be done manually, such as by using a lifting frame to transfer them one by one, or by using a step-by-step feeding method, or by transferring a group of several steel pipes 25 at once.

[0056] The fixture supports the steel pipe 25. The fixture generally consists of multiple serrated plates arranged axially along the steel pipe 25 to provide multi-point support. Space is also created between the plates for the transfer of the steel pipe 25.

[0057] Figure 2 There is a trolley 28, which is equipped with a tooling 27. The tooling 27 is a transfer tooling relative to the fixed tooling, and is used to transfer the steel pipe 25 currently supported on the fixed tooling.

[0058] The tooling 27 supports the steel pipe 25 from both ends in order to fix the two sides of the tooling.

[0059] exist Figure 2 In step a, the trolley 28 moves to the left. At this time, the fixture 27 is lowered into place. The fixture 27 can be raised and lowered using, for example, a lifting mechanism. When it is lowered into place, it can clear the lower busbar of the steel pipe 25, that is, it can completely avoid contact with the steel pipe 25.

[0060] The fixed fixture can also serve as a workpiece positioning fixture in the transverse roller conveyor. Groups of steel pipes 25 from the material rack are placed on the fixed fixture on the first line, which then acts as a workpiece positioning fixture in the transverse roller conveyor. The workpieces are driven by the drive rollers on the transverse roller conveyor, and the steel pipes 25 rotate while moving to another line. During this process, for example, an external shot blasting device is used to clean the outer wall of the steel pipes 25. When the steel pipes 25 reach the predetermined position on the second line, the drive rollers stop driving, and then the unloading process of the external shot blasting is performed.

[0061] At this point, unloading can be achieved by the trolley 28, on which the tooling 27 is installed as a lifting tooling, as previously mentioned. Furthermore... Figure 2 In step b, the material is fed step by step. After the steel pipes 25 on the fixed fixture are filled, step c is executed, which is the step of raising the trolley 28. At this time, the fixture 27 on the trolley 28 rises, which further lifts the steel pipes 25 supported on the fixed fixture, so that the fixed fixture is removed from supporting the steel pipes 25.

[0062] and then Figure 2 In step d, the trolley 28 moves to the right, leaving the position of the fixed fixture. Then, step e is executed, and the trolley 28 descends. At this time, the position where the trolley 28 descends can also be the transverse roller conveyor as described above, and the steel pipe 25 on the trolley 28 is placed on the transverse roller conveyor. The transverse roller conveyor drives the steel pipe 25 to rotate while moving to another line. In this process, the steel pipe 25 is subjected to, for example, external shot blasting.

[0063] When the steel pipe 25 is conveyed to another line by the transverse roller conveyor, the trolley 28 on the other line rises, and step f is executed, thereby lifting the steel pipe 25 located at the intersection of the transverse roller conveyor and the second line, thus freeing the steel pipe 25 from the support of the transverse roller conveyor. The trolley 28, carrying the steel pipe 25, moves to the right on the second line to the unloading position, for example... Figure 2 In step g, the trolley 28 transports the steel pipe 25 to the unloading platform 29. Then, in step h, the trolley 28 descends, allowing the unloading platform 29 to support the steel pipe. The unloading platform 29 is also tilted, and the steel pipe 25, falling onto the unloading platform 29, continues to roll forward and enters... Figure 2 The stacking platform 30 shown is illustrated.

[0064] The trolley 28 executes step i and rises to transfer the next set of steel pipes 25, i.e., executes step j. The trolley moves to the left. Step j is the same as step a, i.e., it enters the next cycle. Step k is the same as step b. After the trolley reaches the loading platform 26, the trolley first descends and performs step loading.

[0065] Figure 2 For ease of description, it appears that the trolley 28 is configured on one line, but in fact it is on two lines. A transverse roller conveyor transfers the steel pipe 25 between the two lines. During the transfer process, the steel pipe 25 is shot blasted externally. Then, on another line, the steel pipe 25 after shot blasting is sent to the stacking platform 30 before shot blasting.

[0066] As described above, the transverse roller conveyor can be set in two positions, and in practice, it can also be set in a third position, namely... Figure 2 Left side of the unloading platform 29.

[0067] The loading and unloading of shot blasting equipment are common knowledge in this field and will not be elaborated upon here. In particular, regarding the configuration of the transverse roller conveyor, the rollers used are generally rollers with multiple grooves. The rollers are obliquely positioned relative to the conveying direction (transverse). The steel pipe 25 supported in the grooves experiences both circumferential and axial forces acting on it during the rotation of the rollers. These are also common knowledge in this field and will not be elaborated upon here.

[0068] Because a second transverse roller conveyor also exists in the embodiments of the present invention, such as Figure 1 The workpiece sorting roller conveyor 21 shown is relative to, for example, Figure 1 Regarding the first conveyor roller conveyor 3 shown, the workpiece sorting roller conveyor 21 is a regular conveyor roller, not an inclined conveyor roller. Here, the first conveyor roller conveyor 3 is defined as the first transverse roller conveyor, and the workpiece sorting roller conveyor 21 is defined as the second transverse roller conveyor.

[0069] It is evident that the external spraying device is located at the first transverse roller conveyor for cleaning the outer wall of the workpiece on the first transverse roller conveyor.

[0070] Based on the above description, it can be seen that the workpiece was subjected to external shot blasting during the transfer between the two lines. At this time, the posture of the steel pipe 25 remained unchanged, which just met the requirements of external shot blasting, while the current posture of the steel pipe 25 also met the requirements of internal shot blasting.

[0071] Furthermore, a first internal polishing device is provided, which is disposed in the middle of the first line to perform internal wall cleaning on workpieces transferred from the second line via the first transverse roller conveyor and having undergone external wall cleaning; at the same time, a second internal polishing device is provided, which is disposed in the middle of the second line to perform internal wall cleaning on workpieces transferred from the first line via the first transverse roller conveyor and having undergone external wall cleaning.

[0072] from Figure 1 As seen in the illustrated structure, for example, the internal throwing device is located in the space between the two lines to make full use of the factory space. Simultaneously, as mentioned earlier, internal throwing generally requires a pipeline with an internal throwing head installed at the end. During internal throwing, for example, the steel pipe 25 itself can remain stationary (i.e., in a static state) or rotate around its own axis. The aforementioned pipeline for conveying the shot needs to extend into, for example, the steel pipe 25 and move axially within it. Corresponding to the horizontally placed steel pipe 25, the main body of the corresponding internal throwing device is... Figure 1 As can be seen in the illustrated structure, it is usually located on one side of the steel pipe 25 conveyor line, so that it can be inserted into the steel pipe 25 from one end to complete the internal throwing.

[0073] In addition, to avoid mutual interference, Figure 1 In the illustrated structure, the two internal throwing devices are spaced a given distance apart in the two line conveying directions.

[0074] In addition, for external shot blasting, for example, shot blasting machines can operate over a relatively large area. Therefore, in order to make full use of the shot blasting capacity of the shot blasting machine, when performing external shot blasting operations, the outer wall of a group of 4 to 7 steel pipes 25 is cleaned each time.

[0075] The grooved, inclined rollers mentioned above are a commonly used type of external spraying rollers. Multiple grooves can be provided on these rollers to accommodate the cleaning of the outer walls of multiple steel pipes 25.

[0076] Since external blasting typically cleans the outer walls of groups of steel pipes 25, while internal blasting generally only cleans the inner walls of individual steel pipes 25, under these conditions, internal blasting requires the loading of individual steel pipes 25. As mentioned earlier, for example... Figure 2 The process equipment corresponding to each step illustrated includes a stacking platform 30 to unload the steel pipes 25 after they have been thrown outwards onto the stacking platform 25. Then, a stepping feeding device is set on the front side of the stacking platform 25 to feed the steel pipes 25 one by one, thereby satisfying the cleaning of the inner wall of the steel pipes 25 by the internal throwing process equipment.

[0077] As mentioned above, the stepping feeding device is a relatively mature technology in this field. In the embodiments of the present invention, after the external spraying, the steel pipes 25 are stacked on the stacking platform 30, which has good secondary feeding conditions. Therefore, the traditional stepping feeding device can basically meet the secondary feeding requirements.

[0078] In an embodiment of the present invention, a novel stepping feeding device is also provided, see the appendix to the specification. Figure 3 The stepping feeding device shown in the figure includes:

[0079] The fixed toothed plate 39 is equipped with at least one pair, and the first tooth grooves of the corresponding two or more fixed toothed plates 39 are aligned to cooperate in supporting the steel pipe 25;

[0080] The lifting toothed plate 32 is arranged parallel to the fixed toothed plate 39, with the same tooth spacing as the fixed toothed plate 39 and the tooth profiles of the lifting toothed plate 39 being staggered; and

[0081] The lifting device drives the lifting toothed plate 32 to rise and fall. When the lifting toothed plate 32 is in the lower stop position, the steel pipe 25 is supported in the first tooth groove. When the lifting toothed plate 32 is in the upper stop position, the portion of the rear tooth profile 35 of the second tooth groove of the lifting toothed plate 32 that is aligned with the tooth tip of the fixed tooth 38 of the corresponding fixed toothed plate 39 is higher than the tooth tip of the fixed tooth 38, so that the steel pipe 25 is lifted and slides forward into the second tooth groove determined by the current rear tooth profile 35 and the corresponding front tooth profile 37.

[0082] exist Figure 3In the illustrated structure, the front tooth profile 37 is abbreviated as the front side tooth profile, and the rear tooth profile 35 is abbreviated as the rear side tooth profile, determined with reference to the forward direction of the steel pipe 25. Since the lifting tooth plate 32 and the fixed tooth plate 39 are misaligned and have the same tooth spacing, when the lifting tooth plate 32 rises, the rear tooth profile 35 will lift the steel pipe 25 upward. Based on the inclined surface of the tooth profile itself, the steel pipe 25 moves forward until it collides with the front tooth profile 37 and stops, finally falling into the second tooth groove.

[0083] Due to the aforementioned characteristics of the rear tooth profile 35, namely, corresponding to the upper stop position of the lifting tooth plate 32, the rear tooth profile 35 is higher than the tooth tip of the corresponding fixed tooth 38, thereby enabling the steel pipe 25 to just pass over the fixed tooth 38.

[0084] Furthermore, when the lifting toothed plate 32 resets, that is, when it falls, the next first toothed slot will receive the steel pipe 25 that has stepped forward again.

[0085] Based on the control of the tooth profile, the step feeding of steel pipe 25 can be accurately realized.

[0086] Furthermore, the chamfer of the front profile 37 of the second tooth groove is greater than the chamfer of the rear profile 35, from Figure 3 As can be seen in the illustrated structure, the front tooth profile 37 has a large inclination and presents a steep state, while the rear tooth profile 35 has a small inclination and presents a gentle state. Mainly due to this structure, the steep rear tooth profile 37 is conducive to achieving the limiting position, while the relatively gentle rear tooth profile 35 will not generate a large impact during step feeding.

[0087] Correspondingly, the inclination of the front tooth profile is 5 to 9 times that of the rear tooth profile. Under this condition, the eccentric setting of the second tooth groove is more obvious, thus meeting the requirements of smooth step feeding and relatively small impact after stepping.

[0088] In addition, as an alternative, a long and short steel pipe sorting device is provided before the parallel first and second unloading devices, such as... Figure 1 The workpiece sorting roller conveyor 21 shown is used to transport sorted workpieces that do not belong to the current unloading device to another unloading device; sorting can be done manually.

[0089] Accordingly, one of the first unloading device or the second unloading device is used for unloading long steel pipes, and the other is used for unloading short steel pipes.

Claims

1. A steel pipe shot blast and air blast cleaning system characterized by, include: The first line has a first feeding device and a first unloading device; The second line is set in parallel with the first line, and the second line has a second feeding device and a second unloading device; The first transverse roller conveyor is used for the front connection between the first line and the second line to transport the workpiece on the current line to the other line while maintaining the current position. An external spraying device is used to clean the outer wall of workpieces on the first transverse roller conveyor. The first internal polishing device is located in the middle of the first line to clean the inner wall of the workpiece that has been transferred from the second line through the first transverse roller conveyor and has undergone outer wall cleaning. as well as The second internal polishing device is located in the middle of the second line to clean the inner wall of the workpiece that has been transferred from the first line through the first transverse roller conveyor and has undergone outer wall cleaning.

2. The steel pipe shot blast cleaning system of claim 1, wherein, The external spraying device is compatible with external spraying fixtures suitable for external spraying operations on a set of steel pipes. The internal blasting and spraying equipment for the first and second internal blasting and spraying devices is suitable for internal blasting and spraying operations on single steel pipes.

3. The steel pipe shot blast cleaning system of claim 2, wherein, The first and second internal throwing and spraying devices are equipped with a material stacking platform to receive steel pipes delivered from the external throwing and spraying device received by the first or second line. Furthermore, a stepping feeding device is installed at the end of the stacking workbench.

4. The steel pipe shot blast cleaning system of claim 3, wherein, The stepping feeding device includes: The fixed toothed plates are provided with at least one pair, and the first tooth grooves of the corresponding fixed toothed plates are aligned to cooperate in supporting the steel pipe; A lifting toothed plate is arranged parallel to a fixed toothed plate, with the same tooth spacing as the fixed toothed plate and staggered tooth profiles; and A lifting device is used to drive the lifting toothed plate to rise and fall. When the lifting toothed plate is in the lower stop position, the steel pipe is supported in the first tooth groove. When the lifting toothed plate is in the upper stop position, the portion of the rear tooth profile of the second tooth groove of the lifting toothed plate that is aligned with the top of the fixed tooth of the corresponding fixed toothed plate is higher than the top of the fixed tooth, so that the steel pipe is lifted up and slides forward into the second tooth groove determined by the current rear tooth profile and the corresponding front tooth profile.

5. The steel pipe shot blast cleaning system of claim 4, wherein, The inclination of the front profile of the second tooth groove is greater than the inclination of the rear profile.

6. The steel pipe shot blast cleaning system of claim 5, wherein, The inclination of the front tooth profile is 5 to 9 times that of the rear tooth profile.

7. The steel pipe blasting and cleaning system according to claim 1, characterized in that, The first internal jetting device and the second internal jetting device are located in the space between the first line and the second line; The first internal jetting device and the second internal jetting device are at a given distance in the front-to-back direction.

8. The steel pipe blasting and cleaning system according to claim 1, characterized in that, The first feeding device is used for feeding coarse steel pipes, and the second feeding device is used for feeding fine steel pipes. The coarse steel pipe and the fine steel pipe are a pair of concepts with opposite pipe diameters, distinguished according to predetermined specifications.

9. The steel pipe blasting and cleaning system according to claim 8, characterized in that, A long and short steel pipe sorting device is provided in front of the parallel first unloading device and the second unloading device; Accordingly, a second transverse roller conveyor is provided to transport the sorted workpieces that do not belong to the current unloading device to another unloading device; Accordingly, one of the first unloading device or the second unloading device is used for unloading long steel pipes, and the other is used for unloading short steel pipes.

10. The steel pipe blasting and cleaning system according to claim 1, characterized in that, Except for the roller platform, the first and second lines have a sloping structure in the upward unloading direction.

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