Pipe conveying device and sandblasting machine

Abstract

The application discloses a steel pipe conveying device and a sand blasting cleaning machine, wherein the steel pipe conveying device matched with the sand blasting cleaning machine comprises a chain plate conveying mechanism, a steel pipe positioning component, a cover plate and a driving part.

Description

TECHNICAL FIELD

[0001] The present application relates to a steel pipe conveying device, and a sand blasting cleaning machine provided with the steel pipe conveying device. BACKGROUND

[0002] At present, steel pipes are widely used in the transportation of oil, natural gas, water and other media, and with the development of technology, the types of media transported by steel pipes are more extensive. The service life of steel pipes is greatly related to the corrosion prevention measures taken for them. Steel pipe corrosion is an important discipline at present, and two aspects are mainly considered in steel pipe corrosion, one is the influence of the transported medium, which can cause chemical or electrochemical reaction of the steel pipe and corrosion, and the other is the influence of the use environment and the storage and transportation environment on the chemical or electrochemical reaction corrosion.

[0003] Steel pipe corrosion is the main means to control the corrosion of steel pipes, and generally a corrosion resistant layer needs to be prepared on the inner surface of the steel pipe to isolate and protect the steel pipe substrate. Before preparing the corrosion resistant layer, the steel pipe usually needs to be sand blasted.

[0004] The focus of steel pipe corrosion is the inner surface (also known as the inner wall). At present, the main treatment method for the inner surface of the steel pipe is manual sand blasting. Since a large amount of dust is generated during sand blasting and the working noise is loud, the work intensity is high and the working environment is poor for workers, which affects their physical and mental health.

[0005] Therefore, it is an important research direction to semi-automatically or automatically clean the steel pipe. At present, a steel pipe conveying device is generally used to convey the steel pipe in a predetermined direction. The steel pipe is positioned on the steel pipe conveying device with its axis horizontal and perpendicular to the conveying direction, i.e. the steel pipe is positioned horizontally on the steel pipe conveying device. The steel pipe conveying device is usually configured as an intermittent mechanism. Each time it stops, a steel pipe is aligned with a sand blasting nozzle, and the nozzle is connected to a rigid and horizontally arranged pipe. Accordingly, during sand blasting, the nozzle gradually penetrates into the steel pipe under the drive of its driving mechanism, and after completing the sand blasting of the entire inner wall of the steel pipe, the nozzle is reset and separated from the steel pipe. The steel pipe conveying device advances to the next stop position and stops after the next steel pipe is aligned with the nozzle, and the next sand blasting cycle is performed.

[0006] As mentioned above, sand blasting can generate a lot of dust, and the sand used in sand blasting, such as copper ore sand, quartz sand, and corundum, has a particle size generally less than 3 mm, and the fine sand has a particle size up to 0.1 mm. The conveying mechanism is easily directly invaded by the dust or sand, and thus, for example, abrasive wear is generated, and even mechanical scratches are generated, which affect the service life of the steel pipe conveying device. At present, the steel pipe conveying device used on the sand blasting cleaning machine generally lacks measures for protecting the steel pipe conveying device from sand and dust, and thus, the overall working environment of the steel pipe conveying device is relatively poor. SUMMARY

[0007] The present application aims to provide a steel pipe conveying device with a relatively good working environment, and further provides a sand blasting cleaning machine provided with the steel pipe conveying device.

[0008] According to a first aspect of the embodiments of the present application, a steel pipe conveying device is provided for conveying a steel pipe in a sand blasting process of the inner surface of the steel pipe, and the steel pipe conveying device comprises:

[0009] A chain plate conveying mechanism comprising two chain rings arranged in parallel left and right, and a shielding part for shielding the lower chain edge arranged in the chain ring;

[0010] A steel pipe positioning part, two ends of which are fixedly connected with the chain ring at the corresponding end, so that the axis of the positioned steel pipe is perpendicular to the chain ring; and the steel pipe positioning part is arranged in multiple or multiple groups in the direction in which the chain ring is wound;

[0011] A cover plate corresponding to each link of the chain ring and fixed on the corresponding link to cover the link installed thereon; the adjacent cover plates are end-to-end connected on the chain edge; and

[0012] A driving part for outputting driving force to drive the chain plate conveying mechanism to move.

[0013] Optionally, the cover plate has:

[0014] A first structure comprising a curved plate configured as a dome;

[0015] A second structure comprising a rectangular cover shell with a notch facing the link; or

[0016] A third structure comprising two slope plates connected at one end away from the link and flared at the other end to form a ridge-shaped cover shell.

[0017] Optionally, the cover plate is further configured as:

[0018] Corresponding to the first structure, the mouth of the dome is wider than the width of the link, and a baffle is connected at both sides of the mouth to cover the corresponding link from the inside and outside;

[0019] Corresponding to the second structure, the slot width of the rectangular cover is greater than the connection width, and the long side of the slot corresponds to the further extended panel to cover the corresponding chain link on the inside and outside;

[0020] Corresponding to the third structure, the roof cover determines the mouth part which is wider than the link width, and the mouth part is connected with the vertical stop plate to cover the corresponding chain link on the inside and outside.

[0021] Optionally, the cover plate is provided with a mounting part;

[0022] The chain plate of the chain link is provided with a connecting part, and the mounting part is connected through the connecting part for the installation of the cover plate on the corresponding chain link.

[0023] Optionally, the connecting part is a vertical strip on the chain plate, and the strip is provided with a connecting hole;

[0024] Corresponding, the mounting part is configured as a mounting plate, and the mounting plate is provided with a mounting hole corresponding to the connecting hole.

[0025] Optionally, the strip corresponds to the chain plate one by one, and forms a 90-degree bending plate with the chain plate as a whole;

[0026] Correspondingly, one chain link has two bending plates, and the two bending plates contain a row of connecting holes on each strip;

[0027] The mounting plate is a single plate, and two rows of mounting holes are provided correspondingly;

[0028] The mounting plate is in the cover plate, and is welded with the cover plate.

[0029] Optionally, the shielding part is provided with a rolling way;

[0030] The chain shaft corresponding to the chain link is provided with a roller running with the rolling way.

[0031] Optionally, the steel pipe positioning part is installed on the chain ring through the cover plate;

[0032] Correspondingly, each steel pipe positioning part includes a support beam, and the two ends of the support beam are fixedly connected with the cover plates at the ends;

[0033] The support beam is provided with a plurality of V-shaped blocks, and the V-shaped blocks are arranged in the extension direction of the support beam.

[0034] Optionally, the cover plate is provided with a sealing element at the end.

[0035] According to the second aspect of the embodiment of the application, a sand blasting cleaning machine is provided, which comprises:

[0036] A sand blasting cleaning chamber is provided with a steel pipe conveying device provided by the first aspect of the embodiment of the application, and one side of the steel pipe conveying device is provided with a track perpendicular to the chain ring;

[0037] The trolley is used to place the sand blaster, the sand blaster includes a hard horizontal pipe and a nozzle at the end of the horizontal pipe; the horizontal pipe is consistent with the height of the steel pipe positioned by the steel pipe positioning part;

[0038] The dust removal system is connected with the top of the sand blasting cleaning chamber through the suction pipe to lead out the dust in the sand blasting cleaning chamber and purify and then empty.

[0039] In the embodiment of the present application, the provided steel pipe conveying device adopts a chain plate conveying mechanism as a basic conveying mechanism, and a cover plate is arranged at the corresponding chain ring link, the cover plate corresponds to the chain link one by one and is fixed on the chain link, the adjacent cover plates are end-to-end connected on the chain edge to form a mechanical joint type sealing, and the sand can be prevented from directly entering the chain during sand blasting, so that the chain has a better protection effect and the working environment of the chain is optimized. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 It is a structural schematic view of the sand blasting cleaning machine in an embodiment.

[0041] Figure 2 It is a schematic view of the chain plate assembly in an embodiment.

[0042] Figure 3 It is Figure 2 A enlarged view of A part.

[0043] Figure 4 It is Figure 2 A enlarged view of B part.

[0044] Figure 5 It is a main view structural schematic view of the cover plate-mounting plate assembly in an embodiment.

[0045] Figure 6 It is a top view structural schematic view corresponding to Figure 5 .

[0046] In the figure: 1. pit, 2. belt conveyor, 3. sand blasting cleaning chamber, 4. material collecting auger, 5. steel pipe conveying device, 6. nozzle, 7. spray pipe, 8. suction pipe, 9. carrier, 10. sand blaster, 11. sand tank, 12. elevator, 13. induced draft fan, 14. dust collector, 15. support beam, 16. V-shaped block, 17. chain ring, 18. cover plate, 19. chain shaft, 20. roller, 21. chain plate, 22. connecting plate, 23. connecting hole, 24. roller, 25. joint seam, 26. baffle, 27. baffle, 28. slope plate, 29. mounting plate, 30. weld seam, 31. weld seam, 32. reinforcing plate, 33. mounting hole. IMPLEMENTATION

[0047] For ease of description, the basic reference frame in the embodiments of the present invention will be described first. See the appendix to the specification. Figure 2 The figure shows a schematic diagram of the chain plate assembly in one embodiment. In order to clearly reflect the structural features of the chain, some cover plates 18 are omitted in the figure, such as the cover plate 18 on the left chain ring in the figure. Every other cover plate 18 is omitted in the figure. The number of cover plates 18 on the upper chain edge on the right chain ring in the figure is complete.

[0048] In general, in the field of mechanics, the direction of travel is used to determine the forward and backward directions. The direction of travel is generally called forward, and the corresponding directional term is "head"; the opposite direction is called backward, and the corresponding directional term is "tail". In addition, the head and tail direction is also called longitudinal, and can generally be referred to as the long direction.

[0049] In a horizontal plane, the direction perpendicular to the front-back direction is the left-right direction, also known as the transverse direction, which can correspond to the width direction.

[0050] Since the improvement of the prior art in this embodiment of the invention focuses on the steel pipe conveying device, the other components of the sandblasting machine can refer to the basic reference system of the steel pipe conveying device.

[0051] Additionally, for chains, the parts that typically form chain loops, excluding the portion surrounding the sprocket, are generally referred to as chain edges. Chain edges... Figure 2 The chain has an upper chain edge and a lower chain edge, and the chain is a flexible component, which is generally divided into tight edge and loose edge. Given that the upper chain edge is in a supporting and positioning state in the embodiment of the present invention, it is more appropriate to regard it as a tight edge.

[0052] It should be noted that, regarding the steel pipe positioning components, in Figure 2 The positioning of the steel pipe can only be achieved when the steel pipe is positioned on the upper chain side; the steel pipe positioning component on the lower chain side is in the return state and is not used to position the steel pipe. Therefore, regarding, for example... Figure 1 The carrier 9 shown has a spray nozzle 7 on the sandblaster 10 that is aligned with a steel pipe positioning device located on the upper chain side.

[0053] Furthermore, it is preferable when the top chain edge is a horizontal chain edge.

[0054] However, in some embodiments, in order to facilitate the flow of some scattered sand in a predetermined direction, the upper chain edge may have a certain slope, thereby facilitating the arrangement of the frame portion located within the chain ring, as well as the setting of, for example, a material receiving plate.

[0055] Figure 2 The sprocket and frame are omitted, and from... Figure 3As can be seen, when the cover plate 18 is turned to the lower chain edge, the protection of the chain will be lost, and therefore a shield, such as the aforementioned material dripping plate, needs to be arranged in the chain loop to shield the lower chain edge.

[0056] Since the chain is a flexible member, in some embodiments the upper chain edge can be kept as horizontal as possible by tensioning, but when the upper chain edge is relatively long, the sag of the chain is inevitable. Therefore, in the preferred embodiments, the shield for shielding the lower chain edge or the frame portion for mounting the sprocket can also be configured as a track for the rollers 20 mounted on the chain shaft 19 to run, so as to keep the upper chain edge in a better levelness, which is beneficial to the alignment of the spray head 6 with the steel pipe, and will be described in detail hereinafter.

[0057] In the embodiments of the present application, the steel pipe conveying device is configured on the basis of a chain plate conveying mechanism, which comprises two chain loops, and corresponding sprocket sets and sprocket shafts, and the two chain loops correspondingly located at the same end chain wheel can share a sprocket shaft, so as to keep synchronization.

[0058] The driving sprocket and the driven sprocket can be sprockets with different diameters, for example, the driving sprocket is a large sprocket and the driven sprocket is a small sprocket, where the size is a pair of relative concepts, indicating that the transmission ratio is less than 1. At this time, the wrap angle of the chain on the large sprocket is greater than 180 degrees, and the wrap angle of the chain on the small sprocket is less than 180 degrees. At least one of the upper chain edge and the lower chain edge cannot be kept parallel to the center line of the sprocket, but under the condition of ensuring that the upper chain edge is a horizontal chain edge, the lower chain edge will have a relatively large inclination, so as to arrange, for example, a material dripping plate in the chain loop.

[0059] Obviously, the two chain loops are parallel to each other and opposite to each other on the left and right sides of the chain plate conveying mechanism.

[0060] Regarding the drive of the chain plate conveying mechanism, a motor is generally used in combination with a speed reducer (a motor speed reducer assembly currently exists) to drive. In view of the fact that the chain plate conveying mechanism needs to be driven intermittently in the embodiments of the present application, a servo motor is preferably used for driving, which is driven by a servo and can be configured without a speed reducer.

[0061] Since the steel pipe conveying device is applied to the conveying of steel pipes in the steel pipe inner surface sand blasting process, and as described previously, the steel pipe conveying device needs to be driven intermittently in such a process, and the sand blasting is often performed at a predetermined position, such as Figure 2 the middle position of the upper chain edge of the middle chain loop, therefore, the shield can not necessarily completely cover the lower chain edge. For the portions of the sprockets wrapped at both ends, they can not be considered for shielding because they are far away from the sand blasting position.

[0062] And as Figure 3 andFigure 4 As shown, due to the chain wheel, the centrifugal side gap gradually increases, which makes the sealing more difficult to achieve. If the joint 25 is connected by an organ case, a better sealing can be formed at the chain wheel.

[0063] Therefore, in some embodiments, the joint can be based on the organ case to form a joint.

[0064] The organ case can also be replaced by a flexible component, such as a rubber sheet, which is fixed to the corresponding cover plate 18. The rubber sheet is easy to break and not as durable as the organ case.

[0065] As mentioned earlier, since sandblasting is usually performed at selected positions, and the two ends of the upper chain edge are usually not sandblasting stations, even if the chain links are exposed at the two ends of the chain ring or the inside of the cover plate 18 at the lower chain edge, it is not enough to directly affect the protected chain links by the sand.

[0066] It should be noted that in the embodiments of the present application, the chain is not absolutely protected, but the working environment is improved.

[0067] It should be noted that the semi-automatic or automatic development of the steel pipe sandblasting process has been developed, and therefore the product used to limit the steel pipe conveying device is not a new product, and therefore in the embodiments of the present application, the steel pipe positioning component of the known steel pipe conveying device can be selected. The condition is that the two ends of the steel pipe positioning component are fixedly connected to the chain ring at the corresponding end, so that the axis of the positioned steel pipe is perpendicular to the chain ring, and at this time, the axial direction of the positioned steel pipe is the transverse direction of the chain plate conveying mechanism, and Figure 1 the extension direction of the spray pipe 7 in the chain plate conveying mechanism is also known, and the height of the positioned steel pipe should be consistent with the height of the spray pipe 7, and more accurately, the axis of the spray pipe 7 is collinear with the axis of the steel pipe in the ideal state. However, in the embodiments of the present application, a grouping method of the steel pipe positioning component is also proposed, that is, a plurality of steel pipes are sandblasted at a time, and a plurality of spray pipes 7 can be arranged in parallel by a carrier 9.

[0068] As shown in Figure 2 , the steel pipe positioning component provided with the V-shaped block 16 is grouped in pairs, and the corresponding spray pipe 7 is configured as a pair, and two steel pipes are sandblasted at a time.

[0069] In addition, referring to Figure 2 , the steel pipe positioning component currently on the upper chain edge has five groups, and the current position of the middle group can be selected as the sandblasting station, as can be seen from the figure, the sandblasting station is far away from the two ends of the upper chain edge, and even if the cover plate 18 gradually opens up as shown in Figure 4 , the influence on the chain link will be smaller.

[0070] The grouping is not necessarily dependent on the grouping of the steel pipe positioning members themselves, and if the steel pipe positioning members are uniformly spaced on the chain, the plurality of nozzles 7 can still satisfy the grouping based on the number of nozzles 7.

[0071] Referring to Figure 3 and Figure 4 In the illustrated structure, the cover plates 18 correspond to the links of the chain ring one by one and are fixed to the corresponding links to cover the installed links. The object to be protected is the chain shaft 19, i.e., the fitting gap between the chain shaft 19 and the chain plate 21, to avoid or reduce abrasive wear or mechanical scratches caused by the intervention of, for example, sand.

[0072] Therefore, further, the chain edges between adjacent cover plates 18 are formed in end-to-end engagement to form a mechanically contacting seal. As previously described, this does not exclude a mechanically connected seal structure.

[0073] Regarding the structure of the cover plates 18, based on the aforementioned end-to-end engagement, a structure having a substantially equivalent cross section in the chain direction is presented, as shown in Figure 5 The cover plate 18 shown in Figure 5 as an embodiment of the present application can be formed by bending, for example, a rectangular steel plate three times in parallel with each other, thereby forming a ridge-like structure as shown in

[0074] If it is said that the rectangular plate is bent three times to form a ridge-like structure as shown in Figure 5 , it can be matched to a rectangular cover shell if it is bent (90 degrees) twice, which is referred to as a second structure.

[0075] In some embodiments, the main body of the cover plate 18 is a curved plate, for example, a 180-degree arc-shaped plate, which is referred to as a first structure.

[0076] In the shielding state, the arc-shaped plate in the first structure is located above the link. Similarly, in the shielding state, for the ridge-like structure, the ridge of the ridge portion is located above the link; for the second structure, the bottom plate of the rectangular cover shell is located above the link.

[0077] In the first structure, the curved plate configured as a dome is not limited to an arc-shaped plate, and the main purpose is to avoid direct impact of, for example, sand on the link.

[0078] The main body portion of the aforementioned three structures can be combined with a flat panel to obtain a larger protection range without affecting the chain transmission.

[0079] In the first structure, for example, a 180-degree arc-shaped plate, a flat panel is connected to each of the circumferential ends to protect the link on both sides. At this time, it is required that the diameter of the arc-shaped plate is greater than the width of the link.

[0080] For a rectangular housing, the overall structure is configured as a through slot, and the two panels defining the slot wall can be further extended to protect the chain links from both sides. The width of the slot opening must be greater than the width of the chain link.

[0081] The third structure is configured as Figure 5 The roof ridge structure is preferred, which includes two sloping panels 28 connected at the upper end to form a ridge, and the sloping panels 28 are outwardly flared to form a generally inverted V-shaped structure in the figure. Figure 5 The lower end of each sloping panel 28 is connected to a vertical baffle 26, 27, the shorter baffle 26 is located on the outside of the chain link, and the longer baffle 27 is located on the inside of the chain link, which can provide better protection under the condition of relatively compact overall structure.

[0082] Regarding the assembly of the cover plate 18 on the chain link, it is preferred to use a detachable connection to ensure the maintainability of the chain, as shown in

[0083] and Figure 3 The chain plate 21 is provided with a structure suitable for mounting, such as a bolt or screw, which is shown as a connecting plate 22 provided on the chain plate 21, and the connecting plate 22 is provided with a connecting hole 23, while the cover plate 18 is provided with a mounting plate 29, and the mounting plate 29 is provided with a mounting hole 33, which is aligned with the connecting hole 23, and can be assembled by a bolt or screw. When maintenance is required, the cover plate 18 at the corresponding position can be removed. Figure 5

[0084] The structure shown in Figure 2 is the structure as seen on paper, and since the pipe diameter for oil transportation is greater than 500mm, in other words, the structure shown in the figure is essentially very large, and the spacing between the chain plates 21 on the corresponding same chain link can provide a relatively large operating space, therefore, the connecting plate 22 shown in the figure can be a flat plate coplanar with the chain plate 21, Figure 5 The baffles 26 and 27 in can be connected as the connected part.

[0085] In order to avoid assembly interference, Figure 5 the mounting plate 29 in Figure 5 may be arranged parallel to the baffle 26. In the example structure, the mounting plate 29 is perpendicular to the baffle 26, and accordingly, the connecting plate 22 is perpendicular to the chain plate 21.

[0086] Figure 3 In , the chain plate 21 and the connecting plate 22 are an integral structure, and the overall structure is configured as a 90-degree bent plate.

[0087] Figure 3 The bending directions of the two bent plates in a chain link are opposite, therebyThe illustrated state.

[0088] Correspondingly, a pair of connecting plates 22 are each provided with a row of connecting holes 23, and then correspondingly, as shown in the figure, the mounting plate 29 is provided with two rows of mounting holes 33, which are suitable for balancing the connection in the chain width direction. Figure 6

[0089] Figure 5 In the embodiment, the mounting plate 29 and the slope plate 28 are connected by welding, and the welding seam 30 is schematically shown in the figure. Since the cover plate 18 is also used for mounting, for example, the support beam 15, or in other words, the support beam 15 is mounted on the chain through the cover plate 18. Therefore, in addition to meeting the shielding requirement, the cover plate 18 should also have a certain strength and rigidity, and therefore, the mounting plate 29 is located in the ridge-shaped structure formed by the slope plate 28, and plays a reinforcing role. At the same time, in order to further strengthen the cover plate 18, a reinforcing plate 32 is also provided at the top of the ridge-shaped structure, and the reinforcing plate 32 is also connected with the slope plate 28 in an integrated manner by welding.

[0090] In Figure 3 and Figure 4 the illustrated structure, the chain shaft 19 is also provided with a roller 24, which is used to ensure the flatness of the upper chain side. Correspondingly, a rolling track is provided on the shielding part, which is configured as, for example, a material pouring plate or a rack, and the rolling track is statically mounted on the shielding part itself or the rack configured by the shielding part. The cooperation of the roller 24 and the rolling track plays a major supporting role, thereby avoiding the problem that the natural sagging of the chain cannot be solved by only relying on the natural tensioning or auxiliary tensioning device of the chain wheel, and finally ensuring the reliable alignment of the steel pipe and the spray head 6.

[0091] Regarding the steel pipe positioning member, since the steel pipe belongs to a workpiece with a cylindrical outer contour, positioning members that meet its positioning in the mechanical field can be used, and the most common positioning member for positioning cylindrical workpieces in the mechanical field is a V-shaped groove. In the embodiment of the present application, a similar structure is also adopted, except that it is not a single V-shaped groove, but a plurality of V-shaped blocks 16, which are arranged in the extension direction of the support beam 15.

[0092] Figure 2 In the embodiment, three V-shaped blocks 16 are provided on one support beam 15, one at each end and one in the middle.

[0093] The V-shaped block 16 arranged in the middle is biased to the side of the spray head 6, so as to improve the overall stability.

[0094] The cross section of the support beam 15 is triangular, and the lower side of the V-shaped block 16 in Figure 4 the lower V-shaped groove is matched with the support beam 15, the V-shaped block 16 is clamped on the support beam 15, and then welded, so as to obtain better assembly reliability. ​

[0095] Figure 3 As can be seen from the drawings, the chain is a roller chain.

[0096] Figure 4 In the drawings, the adjacent cover plates 18 are formed in end-to-end engagement, and a joint seam 25 is formed at the joint. In order to improve the sealing performance of the joint, a sealing member, such as a rubber sealing strip, can be arranged at the end of the cover plate 18.

[0097] Figure 1 The sand blasting cleaning machine shown in the drawings, except for the steel pipe conveying device provided by the embodiment of the present application, the rest mainly belongs to the basic structure of the existing sand blasting cleaning machine, which will be briefly described below.

[0098] The sand blasting cleaning chamber 3 shown in the drawings provides a relatively closed environment to reduce pollution to the surrounding environment. The right end of the sand blasting cleaning chamber 3 in the drawings can be more clearly distinguished as a chain wheel and a motor, the axial direction of the chain wheel is parallel to the axial direction of the spray pipe 7, and the height of the spray pipe 7 in the drawings is consistent with the height of the steel pipe positioned by the upper chain edge.

[0099] The lower side of the chain plate conveying mechanism is a collecting hopper, and the sand falling is collected by the collecting hopper. The lower end of the collecting hopper is received by the material collecting auger 4, which conveys to one end, and the discharged material is received by the belt conveyor 2, which conveys the collected sand to the elevator 12. The upper part of the elevator 12 is provided with a separating device to separate the sand and send it to the sand tank 11. The sand tank 11 supplies the sand blasting device 10, and the sand blasting device 10 is located on a carrier 9. The carrier 9 adopts a rail car to ensure the relative stability of the spray pipe 7 and the certainty of the position. In the drawings, the carrier 9 is located on a table surface, and the table surface is provided with a track for stable and accurate operation of the carrier 9.

[0100] Regarding purification, Figure 1 In the drawings, the air inlet of the dust collector 14 is connected to the sand blasting cleaning chamber through an exhaust pipe. The dust collector 14 can adopt multi-stage dust removal, such as a cyclone dust collector in the front stage and a bag dust collector in the rear stage. At this time, an induced draft fan 13 is required to be configured, which is the induced draft equipment of the bag dust collector and is inherently configured, and will not be described here.

Claims

1. A steel pipe conveying device for conveying a steel pipe in a sandblasting process of an inner surface of the steel pipe, characterized by, The steel pipe conveying device comprises: a chain conveying mechanism comprising two chain rings arranged in parallel left and right and a shielding part for shielding the lower chain edge arranged in the chain ring; a steel pipe positioning part, the two ends of which are fixedly connected with the chain ring at the corresponding end, so that the axis of the positioned steel pipe is perpendicular to the chain ring; and the steel pipe positioning part is arranged in multiple or multiple groups in the direction in which the chain ring revolves; a cover plate corresponding to each link of the chain ring and fixedly connected with the corresponding link to cover the link; the adjacent cover plates are end-to-end connected on the chain edge; and a driving part for driving the chain conveying mechanism to move. The cover plate comprises two slope panels, the two ends of which are connected and the other ends of which are outwardly extended to form a ridge-shaped cover shell; The cover plate is configured such that the opening part of the ridge-shaped cover shell is wider than the link width, and a vertical stop plate is connected to the opening part to cover the corresponding link from the inside and outside; An installation part is arranged in the cover plate; A connecting part is arranged on the chain plate, and the connecting part is connected with the installation part to install the cover plate on the corresponding link; The connecting part is a strip perpendicular to the chain plate, and a connecting hole is formed in the strip; Correspondingly, the installation part is configured as an installation plate, and an installation hole corresponding to the connecting hole is formed in the installation plate; The strip corresponds to the chain plate one by one, and forms a 90-degree bent plate with the chain plate as a whole; Correspondingly, one link has two bent plates, and the two bent plates are folded in opposite directions, and a row of connecting holes is arranged on each strip; The installation plate is a single plate, and two rows of installation holes are arranged opposite to each other; The installation plate is arranged in the cover plate and is welded with the cover plate; A rolling way is arranged on the shielding part; A roller running with the rolling way is arranged on the corresponding chain shaft of the link; The steel pipe positioning part is installed on the chain ring through the cover plate; Correspondingly, each steel pipe positioning part comprises a support beam, the two ends of which are fixedly connected with the cover plate at the corresponding end; A plurality of V-shaped blocks are arranged on the support beam in the extension direction of the support beam.

2. The steel pipe conveyor of claim 1, wherein, The cover plate is provided with a sealing element at the end part.

3. A sandblasting machine, characterized in that It comprises: a sand blasting cleaning chamber, in which the steel pipe conveying device of claim 1 or 2 is arranged, and one side of the steel pipe conveying device is provided with a track perpendicular to the chain ring; a trolley carrying a sand blaster, the sand blaster comprising a horizontal pipe and a nozzle arranged at the end of the horizontal pipe; wherein the horizontal pipe is consistent with the height of the steel pipe positioned by the steel pipe positioning part; a dust removal system connected with the top of the sand blasting cleaning chamber through a suction pipe to draw out the dust in the sand blasting cleaning chamber and then discharge the purified dust.

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