A kind of equipment suitable for rapid prototyping of steel pipe and its control method

Abstract

The present invention relates to the technical field of steel pipe forming, and in particular to a device suitable for rapid steel pipe forming and a control method thereof, which also includes: a second bracket, located at the conveying end of the conveying component, and the formed steel pipe enters the interior of the second bracket; an external welding component, installed in the interior of the second bracket, and used for welding the outer wall of the steel pipe; a fixed pipe rack, one end of which is fixedly connected to the first bracket farthest from the second bracket through a connecting rack; an internal welding component, installed in the interior of the fixed pipe rack, and used for welding the inner wall of the steel pipe; a control unit, used for controlling the external welding component and the internal welding component to perform alternating segmented welding; this device, through the setting of the fixed pipe rack, is conducive to avoiding the situation that the interior of the steel pipe is difficult to weld, resulting in only a single welding of the outer wall of the steel pipe, thereby causing unstable steel pipe welding and affecting the steel pipe welding quality.

Description

Technical Field

[0001] The invention relates to the field of steel pipe forming, and in particular to a device suitable for rapid steel pipe forming and a control method thereof. Background Art

[0002] When producing large-diameter, high-strength steel pipes, a plate rolling machine is used to unfold the large steel coil on the plate rolling machine, clean and pre-treat it to remove surface impurities, then the steel coil is conveyed and pressed. During the conveying process, the steel coil is folded into a square, and finally the folded position is welded to form a closed tubular structure.

[0003] When welding the folded steel coils to form steel pipes, for steel pipes with thick walls, a single welding is performed on the outside of the steel pipes, resulting in unstable welding. As for the inside of the steel pipes, since the steel pipes are continuously conveyed and pressed during the production process, it is difficult to weld the inside of the steel pipes, thus affecting the welding quality of the steel pipes. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a rapid prototyping device suitable for steel pipes and a control method thereof.

[0005] In a first aspect, the present invention provides a rapid prototyping device for steel pipes, comprising a plurality of first brackets, each of which is equipped with a conveying assembly for conveying and extruding the steel pipe, and further comprising:

[0006] A second bracket is located at the conveying end of the conveying assembly, and the formed steel pipe is conveyed by the conveying assembly into the interior of the second bracket;

[0007] An external welding assembly, installed inside the second bracket, for welding the outer wall of the steel pipe;

[0008] A fixed pipe rack, one end of which is fixedly connected to the first rack farthest from the second rack through a connecting rack;

[0009] An internal welding assembly, installed inside the fixed pipe rack, for welding the inner wall of the steel pipe;

[0010] A control unit, used to control the outer welding assembly and the inner welding assembly to perform alternating segmented welding;

[0011] The steel pipe is conveyed inside the conveying assembly. When the steel pipe is conveyed to the inside of the second bracket, the steel pipe has been conveyed and extruded into shape. The steel pipe after being formed is square in shape as a whole. After the steel pipe is conveyed to the inside of the second bracket, the control unit controls the outer welding assembly and the inner welding assembly to start alternately, so that the outer welding assembly and the inner welding assembly alternately weld the inner wall and the outer wall of the steel pipe. By alternately welding the inner wall and the outer wall of the steel pipe, the steel pipe with a certain thickness can be welded both inside and outside, which is conducive to avoiding the situation that the welding of the steel pipe is unstable due to one-side welding, thereby affecting the forming quality of the steel pipe.

[0012] The size of the fixed pipe rack matches the size of the steel pipe and is square. One end is fixedly connected to the first bracket through a connecting rack. When the steel pipe is not fully formed, the top of the steel pipe is not completely merged. At this time, the first bracket and the fixed pipe rack can be connected through the connecting rack, and the other end of the fixed pipe rack extends in the direction of the second bracket, so that the fixed pipe rack extends inside the steel pipe toward the end of the steel pipe after extrusion, so that the internal welding assembly is extended to the position inside the steel pipe that has been extruded to perform welding of the inner wall;

[0013] The setting of the fixed pipe rack is that when the steel pipe has not been transported to the position of the fixed pipe rack, the fixed pipe rack is supported by the conveying component, and when the steel pipe has been transported to the position of the fixed pipe rack, the fixed pipe rack is supported by the inner wall of the steel pipe, so that the fixed pipe rack can be kept in a horizontal position, which is conducive to keeping the internal welding component in the position where welding is required inside the steel pipe for welding, thereby helping to avoid the difficulty in welding the inside of the steel pipe, resulting in only a single welding of the outer wall of the steel pipe, resulting in unstable steel pipe welding and affecting the welding quality of the steel pipe, thereby helping to improve the efficiency of steel pipe welding.

[0014] Preferably, the outer welding assembly comprises:

[0015] Two mounting frames, respectively fixed inside the second bracket;

[0016] A mobile frame, slidably mounted on the top of the two mounting frames;

[0017] A second cylinder is fixed to the top of one of the mounting frames and drives the moving frame to move through the end of the telescopic rod;

[0018] A second welding head is fixedly mounted on the end of the mobile frame and is used to weld the outer wall of the steel pipe;

[0019] The mounting frame can support the movable frame so that the movable frame can slide on the top of the mounting frame. The second cylinder drives the movable frame to move through the end of the telescopic rod, thereby adjusting the position of the second welding head through the movement of the movable frame, so that the second welding head can weld the outer surface of the steel pipe during the movement. By controlling the extension and retraction speed of the telescopic rod of the second cylinder, the movement speed of the second welding head can be adjusted, thereby adjusting the welding movement speed of the outer surface of the steel pipe.

[0020] Preferably, the inner welding assembly comprises:

[0021] An inner pipe rack, fixed inside the fixed pipe rack, wherein a first cylinder is fixed inside the inner pipe rack;

[0022] A mobile pipe rack is slidably mounted inside the inner pipe rack, and the end of the telescopic rod of the first cylinder is fixedly connected to the inner wall of the mobile pipe rack via a connecting piece;

[0023] A first welding head, fixed to the end of the movable pipe rack, for welding the inner wall of the steel pipe;

[0024] The inner pipe rack is fixed inside the fixed pipe rack and can fix the first cylinder. After the first cylinder is started, it can drive the mobile pipe rack to move through the telescopic rod. After the mobile pipe rack moves, it can drive the first welding head to move, so that the first welding head can weld the inner surface of the steel pipe during the movement. By controlling the extension and retraction speed of the telescopic rod of the first cylinder, the movement speed of the first welding head can be adjusted, thereby adjusting the welding movement speed of the inner surface of the steel pipe.

[0025] Preferably, the inner welding assembly further comprises:

[0026] A plurality of rollers are rotatably mounted on the four side walls of the fixed pipe rack in a linear array, and the side walls of the rollers are in contact with the inner wall of the steel pipe;

[0027] The setting of the rollers ensures that when the steel pipe passes through the fixed pipe rack, the surface of the fixed pipe rack is rollingly connected to the inner wall of the steel pipe through the rollers, so that the friction between the inner wall of the steel pipe and the fixed pipe rack is converted from a sliding connection to a rolling connection, which is beneficial to reducing the resistance of friction to the transportation of the steel pipe, and by reducing the resistance of friction, it is beneficial to reduce the friction loss of the inner wall of the steel pipe, which is beneficial to avoid the inner wall of the steel pipe being damaged due to friction and affecting the thickness of the side wall of the steel pipe.

[0028] Preferably, a grinding assembly is also included, and the grinding assembly includes:

[0029] The first grinding sheet and the second grinding sheet are vertically staggered and used for grinding the welding position of the inner wall of the first welding head;

[0030] The first motor and the second motor are both fixed inside the movable pipe frame through a bracket, the output shaft of the first motor drives the first grinding sheet to rotate, and the output shaft of the second motor drives the second grinding sheet to rotate;

[0031] The third grinding sheet and the fourth grinding sheet are vertically staggered and used for grinding the welding position of the outer wall of the first welding head;

[0032] The third motor and the fourth motor are both fixed to the outer wall of the movable frame through a bracket, the output shaft of the third motor drives the third grinding sheet to rotate, and the output shaft of the fourth motor drives the fourth grinding sheet to rotate;

[0033] After the first motor and the second motor are started, the output shaft can be used to drive the first grinding disc and the second grinding disc to rotate. After the first grinding disc and the second grinding disc rotate, the inner surface of the steel pipe can be polished, thereby polishing the position after welding inside the steel pipe, which is conducive to avoiding the situation where the weld scar formed during welding affects the flatness of the inner wall of the steel pipe, thereby affecting the quality of the steel pipe. Similarly, the third grinding disc and the fourth grinding disc polish the outer wall of the steel pipe to reduce the weld scar bulge formed on the outer surface of the steel pipe due to welding;

[0034] The first grinding sheet and the second grinding sheet are arranged perpendicular to each other, so that the first grinding sheet and the second grinding sheet fit the vertical angle of the inner wall of the steel pipe, so that the vertical angle position of the inner wall of the steel pipe remains vertical after grinding, which is beneficial to avoid the steel pipe from being no longer a right angle at one edge during welding due to welding, affecting the production of square steel pipes. Similarly, the perpendicularity of the third grinding sheet and the fourth grinding sheet is also beneficial to maintaining the vertical angle of the outer wall of the steel pipe.

[0035] Preferably, it also includes:

[0036] A collection box, fixed to an end of the fixed pipe rack away from the first cylinder;

[0037] An air inlet is opened on the top of the collecting box, and the air inlet is bent at a right angle, with the right angle point facing the welding position of the steel pipe;

[0038] A filter frame is embedded through a side of the collecting box facing away from the first welding head;

[0039] A negative pressure pump is fixed inside the fixed pipe rack, and an input end of the pump is connected to the filter frame;

[0040] By setting the negative pressure pump, after the negative pressure pump is started, the airflow is driven to flow, and the airflow flows along the direction of the first welding head and the first grinding sheet and the second grinding sheet. Finally, the airflow enters the interior of the collection box along the air inlet and is collected. The filter frame makes the powder remain inside the collection box and will not affect the work of the negative pressure pump. Thus, the powder inside the fixed pipe rack is driven by the airflow to flow and is collected, which is conducive to avoiding the situation where the powder interferes with the normal work of the first welding head and the first grinding sheet and the second grinding sheet.

[0041] Furthermore, by driving the flow of air through the negative pressure pump, the air flow inside the fixed pipe rack can be cooled, so that after the first welding head is welded, the surrounding area of ​​the first welding head can be cooled, which is beneficial to avoid the situation where the temperature around the first welding head rises after repeated welding of the first welding head, thereby affecting the normal work of the first welding head.

[0042] In a second aspect, a control method for a steel pipe rapid prototyping device is provided, wherein a first pressure sensor and a second pressure sensor are respectively fixed to the top ends of one of the mounting brackets and the inner wall ends of the fixed pipe bracket, and a speed sensor for detecting the speed of the steel pipe is installed on the second bracket, and the control method comprises the following steps:

[0043] A1. The control unit obtains the first pressure information from the first pressure sensor;

[0044] A2. The control unit generates first drive information according to the first pressure information;

[0045] A3. The control unit sends the first driving information to the outer welding component or the inner welding component corresponding to the first pressure sensor;

[0046] A4. The control unit obtains second pressure information from the second pressure sensor;

[0047] A5. The control unit generates second drive information according to the second pressure information;

[0048] A6. The control unit sends the second driving information to the outer welding component or the inner welding component corresponding to the second pressure sensor;

[0049] The first pressure sensor is located on a side of the second pressure sensor facing the first bracket, and when the first pressure information is compressed, it represents that the first welding head or the second welding head moves to a side close to the first bracket;

[0050] The movement control logic of the first welding head and the second welding head is the same. Taking the first welding head as an example, when the first welding head moves to squeeze the first pressure sensor, the first pressure sensor generates the first pressure information, which means that the first welding head moves to the final position close to the side of the first bracket. At this time, the first pressure sensor sends the first pressure information to the control unit. After receiving the first pressure information, the control unit generates the first driving information according to the first pressure information, and sends the first driving information to the inner welding assembly, so that the inner welding assembly starts to adjust the moving speed of the first welding head, so that the first welding head moves in the direction away from the first bracket. When the first welding head moves to squeeze the second pressure sensor, the second pressure sensor generates the second pressure information, which means that the first welding head moves to the final position away from the side of the first bracket. At this time, the second pressure sensor sends the second pressure information to the control unit. After receiving the second pressure information, the control unit generates the second driving information according to the second pressure information, and sends the second driving information to the inner welding assembly, so that the inner welding assembly starts to adjust the moving speed of the first welding head, so that the first welding head moves in the direction close to the first bracket, thereby controlling the first welding head to reciprocate and weld the steel pipe, realizing the automatic control welding of the steel pipe, which is beneficial to improve the welding efficiency of the steel pipe.

[0051] Preferably, it also includes:

[0052] B1. The control unit obtains speed information V1 from the speed sensor;

[0053] B2. The control unit brings the speed information V1 into V2=3V1 to obtain the active drive speed V2;

[0054] B3. The control unit generates a first driving speed V3 according to the active driving speed V2 and the first pressure information by substituting V3=V2, wherein the first driving information includes the first driving speed V3;

[0055] B4. The control unit generates a second driving speed V4 according to the active driving speed V2 and the second pressure information by bringing V4=-V2, and the second driving information includes the second driving speed V4;

[0056] The speed detection sensor detects the moving speed of the steel pipe, and the detected moving speed of the steel pipe is the speed information V1, and the speed information V1 is sent to the control unit. After receiving the speed information V1, the control unit substitutes the speed information V1 into V2=3V1 to obtain the active driving speed V2. When the control unit receives the first pressure information, the control unit substitutes the first pressure information and the active driving speed V2 into V3=V2 to generate the first driving speed V3.

[0057] Taking the distance between the first pressure sensor and the second pressure sensor as 3X as an example, when the first welding head is driven to move forward at a speed of V3=3V1, when the first welding head moves from the first pressure sensor to the second pressure sensor, the moving distance of the first welding head is 3X, and at the same time the moving speed of the steel pipe is the speed information V1, and in the same time, the moving distance of the steel pipe is X, that is, the first welding head moves a distance of 2X relative to the steel pipe, that is, the first welding head completes welding of a distance of 2X on the steel pipe, and an unwelded portion of the steel pipe with a distance of X is left between the position of the first pressure sensor;

[0058] When the control unit receives the second pressure information, the control unit brings the second pressure information and the active driving speed V2 into V4=-V2 to generate the second driving speed V4;

[0059] At this time, the first welding head passes through the same time as it moves from the first pressure sensor to the second pressure sensor. The first welding head is driven to move forward at a speed of V4=-3V1, and moves from the second pressure sensor to the first pressure sensor. During this time, the first welding head moves to the position of the first pressure sensor, and the moving distance of the steel pipe is X. At this time, there is an unwelded part of the steel pipe with a distance of 2X between the position of the first pressure sensor. Therefore, when the first welding head moves to the second pressure sensor next time, the first welding head moves 2X distance relative to the steel pipe again, and welds the 2X distance left between the position of the first pressure sensor on the steel pipe. Thus, by controlling the movement of the first welding head, while the steel pipe is moving and conveying normally, the continuous welding of the steel pipe is achieved by changing the moving speed of the first welding head;

[0060] The staggered welding of the inside and outside of the steel pipe by the first welding head and the second welding head is beneficial to improving the welding efficiency of the steel pipe and the welding quality of the steel pipe.

[0061] Preferably, it also includes:

[0062] C1. The control unit obtains and generates polishing control information according to the second driving information, and the polishing control information is used to control the start-up of the polishing component;

[0063] C2. The control unit sends the polishing control information to the polishing component;

[0064] When the control unit generates the second driving information, grinding control information is generated according to the second driving information, and the grinding control information is sent to the grinding component, so that the grinding component starts to grind the side wall of the steel pipe.

[0065] Preferably, it also includes:

[0066] D1. The control unit generates airflow control information according to the polishing control information, and the airflow control information is used to control the start of the negative pressure pump;

[0067] D2. The control unit sends the airflow control information to the negative pressure pump;

[0068] When the control unit generates the second driving information, airflow control information is generated according to the second driving information, and the airflow control information is sent to the negative pressure pump, so that the negative pressure pump starts to drive the airflow inside the fixed pipe rack, thereby collecting the powder generated by grinding.

[0069] Compared with the prior art, the present invention has the following beneficial effects:

[0070] 1. The present invention is conducive to maintaining the internal welding assembly at the position where welding is required inside the steel pipe by fixing the setting of the pipe rack, thereby preventing the inside of the steel pipe from being difficult to weld and only being able to perform a single welding on the outer wall of the steel pipe, thereby causing the steel pipe welding to be unstable and affecting the welding quality of the steel pipe, thereby helping to improve the efficiency of steel pipe welding.

[0071] 2. The present invention provides a grinding assembly so that the inner wall of the steel pipe remains vertical after grinding, which helps to avoid the situation where one edge of the steel pipe is no longer a right angle during welding, affecting the production quality of the square steel pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0072] Figure 1 It is a schematic diagram of the method flow of the present invention.

[0073] Figure 2 It is a schematic diagram of the overall structure of the present invention.

[0074] Figure 3 It is a schematic diagram of the overall cross-sectional structure of the present invention.

[0075] Figure 4 For the present invention Figure 3 Schematic diagram of the enlarged structure at point A in the middle.

[0076] Figure 5 It is a schematic diagram of the position structure of the connecting frame and the fixed pipe frame of the present invention.

[0077] Figure 6 For the present invention Figure 5 Schematic diagram of the enlarged structure at point B in the middle.

[0078] Figure 7 It is a schematic diagram of the position structure of the third grinding sheet and the fourth grinding sheet of the present invention.

[0079] Figure 8It is a schematic structural diagram of the fixed pipe rack section of the present invention.

[0080] Fig. 9 For the present invention Figure 8 Schematic diagram of the enlarged structure at point C in the middle.

[0081] Fig.10 For the present invention Figure 8 Schematic diagram of the enlarged structure at D in the middle.

[0082] In the figure: 1. first bracket; 2. second bracket; 3. connecting frame; 4. fixed pipe rack; 401. roller; 5. inner pipe rack; 6. first cylinder; 7. mobile pipe rack; 8. first welding head; 9. first grinding disc; 901. first motor; 10. second grinding disc; 1001. second motor; 11. mobile frame; 1101. mounting frame; 1102. second cylinder; 12. second welding head; 13. third grinding disc; 1301. third motor; 14. fourth grinding disc; 1401. fourth motor; 15. collecting box; 16. air inlet; 17. filter frame; 18. negative pressure pump; 19. steel pipe. DETAILED DESCRIPTION

[0083] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0084] like Figures 2 to 10 The device shown is suitable for rapid prototyping of steel pipes, comprising a plurality of first brackets 1, each of which is equipped with a conveying assembly for conveying and extruding the steel pipe 19, and further comprising:

[0085] The second bracket 2 is located at the conveying end of the conveying assembly, and the formed steel pipe 19 is conveyed by the conveying assembly into the interior of the second bracket 2;

[0086] An external welding assembly, installed inside the second bracket 2, for welding the outer wall of the steel pipe 19;

[0087] A fixed pipe support 4, one end of which is fixedly connected to the first support 1 farthest from the second support 2 through a connecting frame 3;

[0088] An internal welding assembly, installed inside the fixed pipe rack 4, for welding the inner wall of the steel pipe 19;

[0089] A control unit, used for controlling the outer welding assembly and the inner welding assembly to perform alternate segmented welding;

[0090] When the folded steel coil is welded to form the steel pipe 19, for the steel pipe 19 with a large wall thickness, a single welding is performed on the outer side of the steel pipe 19, which may result in unstable welding. As for the inside of the steel pipe 19, since the steel pipe 19 is continuously conveyed and pressed during the production process, it is difficult to weld the inside of the steel pipe 19, thereby affecting the welding quality of the steel pipe 19.

[0091] This embodiment of the present invention can solve the above problems. The specific implementation method is as follows: the steel pipe 19 is transported inside the conveying assembly. When the steel pipe 19 is transported to the inside of the second bracket 2, the steel pipe 19 has been transported and extruded. The formed steel pipe 19 is square as a whole. After the steel pipe 19 is transported to the inside of the second bracket 2, the control unit controls the outer welding assembly and the inner welding assembly to start alternately, so that the outer welding assembly and the inner welding assembly alternately weld the inner wall and the outer wall of the steel pipe 19. By alternately welding the inner wall and the outer wall of the steel pipe 19, the steel pipe 19 with a certain thickness can be welded both inside and outside, which is conducive to avoiding the situation where the welding of the steel pipe 19 is unstable due to one-sided welding, thereby affecting the forming quality of the steel pipe 19.

[0092] It should be noted that the conveying assembly is a prior art and can be implemented using existing equipment. For example, four squeezing rollers can be arranged inside the first bracket 1. The angles of the four squeezing rollers are gradually changed so that the steel coil is squeezed when passing through the four squeezing rollers, so that the steel coil is gradually squeezed into a square steel tube 19, thereby realizing the conveying and extrusion molding of the steel tube 19, which will not be described in detail here.

[0093] The size of the fixed pipe rack 4 matches the size of the steel pipe 19 and is in a square configuration. One end is fixedly connected to the first bracket 1 through the connecting rack 3. When the steel pipe 19 is not fully formed, the top of the steel pipe 19 is not completely merged. At this time, the first bracket 1 and the fixed pipe rack 4 can be connected through the connecting rack 3, and the other end of the fixed pipe rack 4 extends in the direction of the second bracket 2, so that the fixed pipe rack 4 extends inside the steel pipe 19 toward one end of the steel pipe 19 after extrusion, thereby extending the inner welding assembly to the position inside the steel pipe 19 that has been extruded to perform welding of the inner wall;

[0094] The setting of the fixed pipe rack 4 is that when the steel pipe 19 has not been transported to the position of the fixed pipe rack 4, the fixed pipe rack 4 is supported by the transporting assembly, and when the steel pipe 19 has been transported to the position of the fixed pipe rack 4, the fixed pipe rack 4 is supported by the inner wall of the steel pipe 19, so that the fixed pipe rack 4 can remain in a horizontal position, which is beneficial to keep the internal welding assembly in the position where welding is required inside the steel pipe 19 for welding, thereby helping to avoid the difficulty in welding the inside of the steel pipe 19, resulting in only a single welding of the outer wall of the steel pipe 19, resulting in unstable welding of the steel pipe 19, affecting the welding quality of the steel pipe 19, thereby helping to improve the efficiency of welding the steel pipe 19.

[0095] As an optional embodiment, the outer welding assembly includes:

[0096] Two mounting brackets 1101 are respectively fixed inside the second bracket 2;

[0097] The mobile frame 11 is slidably mounted on the top of the two mounting frames 1101;

[0098] The second cylinder 1102 is fixed to the top of one of the mounting frames 1101 and drives the moving frame 11 to move through the end of the telescopic rod;

[0099] The second welding head 12 is fixedly mounted on the end of the mobile frame 11 and is used to weld the outer wall of the steel pipe 19;

[0100] The mounting frame 1101 can support the movable frame 11 so that the movable frame 11 can slide on the top of the mounting frame 1101. The second cylinder 1102 drives the movable frame 11 to move through the end of the telescopic rod, thereby adjusting the position of the second welding head 12 through the movement of the movable frame 11, so that the second welding head 12 can weld the outer surface of the steel pipe 19 during the movement. By controlling the extension and retraction speed of the telescopic rod of the second cylinder 1102, the movement speed of the second welding head 12 can be adjusted, thereby adjusting the welding movement speed of the outer surface of the steel pipe 19.

[0101] As an optional embodiment, the inner welding assembly includes:

[0102] An inner pipe frame 5 is fixed inside the fixed pipe frame 4, and a first cylinder 6 is fixed inside the inner pipe frame 5;

[0103] The mobile pipe rack 7 is slidably mounted inside the inner pipe rack 5, and the end of the telescopic rod of the first cylinder 6 is fixedly connected to the inner wall of the mobile pipe rack 7 through a connecting piece;

[0104] The first welding head 8 is fixed to the end of the mobile pipe rack 7 and is used to weld the inner wall of the steel pipe 19;

[0105] The inner pipe rack 5 is fixed inside the fixed pipe rack 4, and can fix the first cylinder 6. After the first cylinder 6 is started, it can drive the mobile pipe rack 7 to move through the telescopic rod. After the mobile pipe rack 7 moves, it can drive the first welding head 8 to move, so that the first welding head 8 can weld the inner surface of the steel pipe 19 during the movement. By controlling the extension and retraction speed of the telescopic rod of the first cylinder 6, the movement speed of the first welding head 8 can be adjusted, thereby adjusting the welding movement speed of the inner surface of the steel pipe 19.

[0106] As an optional embodiment, the inner welding assembly further includes:

[0107] A plurality of rollers 401 are rotatably mounted on the four side walls of the fixed pipe rack 4 in a linear array, and the side walls of the rollers 401 are in contact with the inner wall of the steel pipe 19;

[0108] The setting of the roller 401 allows the surface of the fixed pipe rack 4 to be rollingly connected to the inner wall of the steel pipe 19 through the roller 401 when the steel pipe 19 passes through the fixed pipe rack 4, so that the friction between the inner wall of the steel pipe 19 and the fixed pipe rack 4 is converted from a sliding connection to a rolling connection, which is beneficial to reducing the resistance of friction to the transportation of the steel pipe 19, and by reducing the resistance of friction, it is beneficial to reduce the friction loss of the inner wall of the steel pipe 19, which is beneficial to avoid the inner wall of the steel pipe 19 being damaged due to friction and affecting the thickness of the side wall of the steel pipe 19.

[0109] As an optional embodiment, a grinding assembly is also included, and the grinding assembly includes:

[0110] The first grinding sheet 9 and the second grinding sheet 10 are vertically staggered and used for grinding the welding position of the inner wall of the first welding head 8;

[0111] The first motor 901 and the second motor 1001 are both fixed to the inside of the movable pipe frame 7 through a bracket, and the output shaft of the first motor 901 drives the first grinding plate 9 to rotate, and the output shaft of the second motor 1001 drives the second grinding plate 10 to rotate;

[0112] The third grinding sheet 13 and the fourth grinding sheet 14 are vertically staggered and used for grinding the welding position of the outer wall of the first welding head 8;

[0113] The third motor 1301 and the fourth motor 1401 are both fixed to the outer wall of the mobile frame 11 through a bracket, and the output shaft of the third motor 1301 drives the third grinding plate 13 to rotate, and the output shaft of the fourth motor 1401 drives the fourth grinding plate 14 to rotate;

[0114] After the first motor 901 and the second motor 1001 are started, the output shaft can be used to drive the first grinding disc 9 and the second grinding disc 10 to rotate. After the first grinding disc 9 and the second grinding disc 10 rotate, the inner surface of the steel pipe 19 can be polished, so as to polish the position after welding inside the steel pipe 19, so as to avoid the situation where the weld scar formed during welding affects the flatness of the inner wall of the steel pipe 19, thereby affecting the quality of the steel pipe 19. Similarly, the third grinding disc 13 and the fourth grinding disc 14 polish the outer wall of the steel pipe 19 to reduce the weld scar bulge formed on the outer surface of the steel pipe 19 due to welding;

[0115] The first grinding sheet 9 and the second grinding sheet 10 are arranged perpendicular to each other, so that the first grinding sheet 9 and the second grinding sheet 10 fit the vertical angle of the inner wall of the steel pipe 19, so that the vertical angle position of the inner wall of the steel pipe 19 remains vertical after grinding, which is beneficial to avoid the situation where the steel pipe 19 is no longer a right angle at one edge during welding due to welding, affecting the production quality of the square steel pipe 19. Similarly, the perpendicularity of the third grinding sheet 13 and the fourth grinding sheet 14 is also beneficial to maintaining the vertical angle of the outer wall of the steel pipe 19.

[0116] As an optional embodiment, it also includes:

[0117] The collecting box 15 is fixed to one end of the fixed pipe frame 4 away from the first cylinder 6;

[0118] The air inlet 16 is opened at the top of the collecting box 15, and the air inlet 16 is bent at a right angle, and the right angle point faces the welding position of the steel pipe 19;

[0119] The filter frame 17 is embedded through the side of the collecting box 15 facing away from the first welding head 8;

[0120] A negative pressure pump 18 is fixed inside the fixed pipe rack 4, and an input end thereof is connected to the filter frame 17;

[0121] The inner wall of the steel pipe 19 will produce powder during the grinding process. The powder will accumulate inside the steel pipe. Some of the powder may move with the transportation of the steel pipe 19, while some of the powder will remain inside the fixed pipe rack 4, resulting in the accumulation of powder inside the fixed pipe rack 4, affecting the normal operation of the first welding head 8 and the first grinding disc 9 and the second grinding disc 10.

[0122] By setting the negative pressure pump 18, after the negative pressure pump 18 is started, the airflow is driven to flow, and the airflow flows in the direction of the first welding head 8 and the first grinding sheet 9 and the second grinding sheet 10. Finally, the airflow enters the interior of the collection box 15 along the air inlet 16 and is collected. The filter frame 17 allows the powder to remain in the interior of the collection box 15 and will not affect the operation of the negative pressure pump 18. Thus, the powder in the fixed pipe rack 4 is driven by the airflow to flow and is collected, which is conducive to avoiding the situation where the powder interferes with the normal operation of the first welding head 8 and the first grinding sheet 9 and the second grinding sheet 10.

[0123] In addition, the negative pressure pump 18 drives the flow of air to cool the air flow inside the fixed pipe rack 4, so that after the first welding head 8 is welded, the surrounding area of ​​the first welding head 8 is cooled, which is beneficial to avoid the situation where the temperature around the first welding head 8 rises after repeated welding of the first welding head 8, thereby affecting the normal operation of the first welding head 8.

[0124] like Figure 1 A control method suitable for a steel pipe rapid prototyping device is shown, wherein a first pressure sensor and a second pressure sensor are respectively fixed at two ends of the top of a mounting bracket 1101 and two ends of the inner wall of a fixed pipe bracket 4, and a speed sensor for detecting the speed of a steel pipe 19 is installed on the second bracket 2. The control method comprises the following steps:

[0125] A1. The control unit obtains the first pressure information from the first pressure sensor;

[0126] A2. The control unit generates first driving information according to the first pressure information;

[0127] A3. The control unit sends the first driving information to the outer welding assembly or the inner welding assembly corresponding to the first pressure sensor;

[0128] A4. The control unit obtains second pressure information from the second pressure sensor;

[0129] A5. The control unit generates second driving information according to the second pressure information;

[0130] A6. The control unit sends the second driving information to the outer welding assembly or the inner welding assembly corresponding to the second pressure sensor;

[0131] The first pressure sensor is located on the side of the second pressure sensor facing the first bracket 1. When the first pressure information is compressed, it represents that the first welding head 8 or the second welding head 12 moves to the side close to the first bracket 1;

[0132] The movement control logic of the first welding head 8 is the same as that of the second welding head 12. Taking the first welding head 8 as an example, when the first welding head 8 moves to squeeze the first pressure sensor, the first pressure sensor generates a first pressure information, which means that the first welding head 8 moves to the final position close to the side of the first bracket 1. At this time, the first pressure sensor sends the first pressure information to the control unit. After receiving the first pressure information, the control unit generates a first drive information according to the first pressure information, and sends the first drive information to the inner welding component, so that the inner welding component starts to adjust the movement speed of the first welding head 8, so that the first welding head 8 moves in the direction away from the first bracket 1. When the first welding head 8 moves to squeeze When the second pressure sensor is pressed, the second pressure sensor generates second pressure information, which means that the first welding head 8 moves to the final position on the side away from the first bracket 1. At this time, the second pressure sensor sends the second pressure information to the control unit. After receiving the second pressure information, the control unit generates second drive information according to the second pressure information, and sends the second drive information to the internal welding component, so that the internal welding component starts to adjust the moving speed of the first welding head 8, so that the first welding head 8 moves in the direction close to the first bracket 1, thereby controlling the first welding head 8 to reciprocate and weld the steel pipe 19, realizing automated control welding of the steel pipe 19, which is beneficial to improving the welding efficiency of the steel pipe 19.

[0133] As an optional embodiment, it also includes:

[0134] B1. The control unit obtains speed information V1 from the speed sensor;

[0135] B2. The control unit brings the speed information V1 into V2=3V1 to obtain the active drive speed V2;

[0136] B3. The control unit generates a first driving speed V3 according to the active driving speed V2 and the first pressure information by bringing V3=V2, and the first driving information includes the first driving speed V3;

[0137] B4. The control unit generates a second driving speed V4 according to the active driving speed V2 and the second pressure information by bringing V4=-V2, and the second driving information includes the second driving speed V4;

[0138] The speed detection sensor detects the moving speed of the steel pipe 19, and detects the moving speed of the steel pipe 19 as speed information V1, and sends the speed information V1 to the control unit. After receiving the speed information V1, the control unit substitutes the speed information V1 into V2=3V1 to obtain the active driving speed V2. When the control unit receives the first pressure information, the control unit substitutes the first pressure information and the active driving speed V2 into V3=V2 to generate the first driving speed V3.

[0139] Taking the distance between the first pressure sensor and the second pressure sensor as 3X as an example, when the first welding head 8 is driven to move forward at a speed of V3=3V1, when the first welding head 8 moves from the first pressure sensor to the second pressure sensor, the moving distance of the first welding head 8 is 3X, and at the same time, the moving speed of the steel pipe 19 is the speed information V1. In the same time, the moving distance of the steel pipe 19 is X, that is, the first welding head 8 moves a distance of 2X relative to the steel pipe 19, that is, the first welding head 8 completes welding of a distance of 2X on the steel pipe 19, and an unwelded portion of the steel pipe 19 with a distance of X is left between the position of the first pressure sensor;

[0140] When the control unit receives the second pressure information, the control unit brings the second pressure information and the active driving speed V2 into V4=-V2 to generate the second driving speed V4;

[0141] At this time, the first welding head 8 passes through the same time as it moves from the first pressure sensor to the second pressure sensor. The first welding head 8 is driven to move forward at a speed of V4=-3V1, and moves from the second pressure sensor to the first pressure sensor. During this time, the first welding head 8 moves to the position of the first pressure sensor, and the moving distance of the steel pipe 19 is X. At this time, there is an unwelded portion of 2X distance between the steel pipe 19 and the position of the first pressure sensor. Therefore, when the first welding head 8 moves to the second pressure sensor next time, the first welding head 8 moves 2X distance relative to the steel pipe 19 again, and welds the 2X distance left between the position of the first pressure sensor on the steel pipe 19. Thus, by controlling the movement of the first welding head 8, while the steel pipe 19 is moving and conveying normally, the continuous welding of the steel pipe 19 is achieved by changing the moving speed of the first welding head 8;

[0142] The staggered welding of the inside and outside of the steel pipe 19 by the first welding head 8 and the second welding head 12 is beneficial to improving the welding efficiency of the steel pipe 19 and improving the welding quality of the steel pipe 19 .

[0143] As an optional embodiment, it also includes:

[0144] C1. The control unit obtains and generates polishing control information according to the second driving information, and the polishing control information is used to control the start of the polishing component;

[0145] C2. The control unit sends the polishing control information to the polishing component;

[0146] When the control unit generates the second driving information, it generates grinding control information according to the second driving information, and sends the grinding control information to the grinding component, so that the grinding component starts grinding the side wall of the steel pipe 19 .

[0147] As an optional embodiment, it also includes:

[0148] D1. The control unit generates airflow control information according to the polishing control information, and the airflow control information is used to control the start of the negative pressure pump 18;

[0149] D2. The control unit sends the airflow control information to the negative pressure pump 18;

[0150] When the control unit generates the second driving information, it generates airflow control information according to the second driving information, and sends the airflow control information to the negative pressure pump 18, so that the negative pressure pump 18 starts to drive the airflow inside the fixed pipe rack 4, thereby collecting the powder generated by grinding.

[0151] Working principle of the present invention: The steel pipe 19 is conveyed inside the conveying assembly. When the steel pipe 19 is conveyed to the inside of the second bracket 2, the steel pipe 19 has been conveyed and extruded. The steel pipe 19 after being formed is square in shape. After the steel pipe 19 is conveyed to the inside of the second bracket 2, the control unit controls the outer welding assembly and the inner welding assembly to start alternately, so that the outer welding assembly and the inner welding assembly alternately weld the inner wall and the outer wall of the steel pipe 19. By alternately welding the inner wall and the outer wall of the steel pipe 19, the steel pipe 19 with a certain thickness can be welded both inside and outside, which is conducive to avoiding the situation that the welding of the steel pipe 19 is unstable due to one-side welding, thereby affecting the forming quality of the steel pipe 19.

[0152] The size of the fixed pipe rack 4 matches the size of the steel pipe 19 and is in a square configuration. One end is fixedly connected to the first bracket 1 through the connecting rack 3. When the steel pipe 19 is not fully formed, the top of the steel pipe 19 is not completely merged. At this time, the first bracket 1 and the fixed pipe rack 4 can be connected through the connecting rack 3, and the other end of the fixed pipe rack 4 extends in the direction of the second bracket 2, so that the fixed pipe rack 4 extends inside the steel pipe 19 toward one end of the steel pipe 19 after extrusion, thereby extending the inner welding assembly to the position inside the steel pipe 19 that has been extruded to perform welding of the inner wall;

[0153] The setting of the fixed pipe rack 4 is that when the steel pipe 19 has not been transported to the position of the fixed pipe rack 4, the fixed pipe rack 4 is supported by the transporting assembly, and when the steel pipe 19 has been transported to the position of the fixed pipe rack 4, the fixed pipe rack 4 is supported by the inner wall of the steel pipe 19, so that the fixed pipe rack 4 can remain in a horizontal position, which is beneficial to keep the internal welding assembly in the position where welding is required inside the steel pipe 19 for welding, thereby helping to avoid the difficulty in welding the inside of the steel pipe 19, resulting in only a single welding of the outer wall of the steel pipe 19, resulting in unstable welding of the steel pipe 19, affecting the welding quality of the steel pipe 19, thereby helping to improve the efficiency of welding the steel pipe 19.

[0154] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention, and these changes and improvements fall within the scope of the present invention claimed.

Claims

1. A device suitable for rapid prototyping of steel pipes, comprising a plurality of first brackets (1), each of which is provided with a conveying assembly for conveying and extruding a steel pipe (19), characterized in that: Also includes: A second bracket (2) is located at a conveying end of the conveying assembly, and the formed steel pipe (19) is conveyed by the conveying assembly into the interior of the second bracket (2); An external welding assembly, installed inside the second bracket (2) and used for welding the outer wall of the steel pipe (19); A fixed pipe rack (4), one end of which is fixedly connected to the first rack (1) farthest from the second rack (2) via a connecting rack (3); An internal welding assembly, installed inside the fixed pipe rack (4) and used for welding the inner wall of the steel pipe (19); A control unit, used for controlling the outer welding assembly and the inner welding assembly to perform alternate segmented welding; The outer welding assembly comprises: Two mounting frames (1101) are respectively fixed inside the second bracket (2); A movable frame (11) is slidably mounted on the top of the two mounting frames (1101); A second cylinder (1102) is fixed to the top of one of the mounting frames (1101) and drives the moving frame (11) to move via the end of the telescopic rod; A second welding head (12) is fixedly mounted on an end of the movable frame (11) and is used for welding the outer wall of the steel pipe (19); The inner welding assembly comprises: An inner pipe rack (5) is fixed inside the fixed pipe rack (4), and a first cylinder (6) is fixed inside the inner pipe rack (5); A movable pipe rack (7) is slidably mounted inside the inner pipe rack (5), and the end of the telescopic rod of the first cylinder (6) is fixedly connected to the inner wall of the movable pipe rack (7) via a connecting piece; The first welding head (8) is fixed to the end of the movable pipe rack (7) and is used to weld the inner wall of the steel pipe (19).

2. The rapid prototyping equipment for steel pipes according to claim 1, characterized in that: The inner welding assembly also includes: A plurality of rollers (401) are rotatably mounted on the four side walls of the fixed pipe rack (4) in a linear array, and the side walls of the rollers (401) are in contact with the inner wall of the steel pipe (19).

3. The rapid prototyping equipment for steel pipes according to claim 2, characterized in that: Also included is a grinding assembly, the grinding assembly comprising: The first grinding sheet (9) and the second grinding sheet (10) are arranged in a vertically staggered manner and are used to grind the welding position of the inner wall of the first welding head (8); The first motor (901) and the second motor (1001) are both fixed to the inside of the movable pipe frame (7) through a bracket, the output shaft of the first motor (901) drives the first grinding plate (9) to rotate, and the output shaft of the second motor (1001) drives the second grinding plate (10) to rotate; The third grinding sheet (13) and the fourth grinding sheet (14) are arranged in a vertically staggered manner and are used to grind the welding position of the outer wall of the first welding head (8); The third motor (1301) and the fourth motor (1401) are both fixed to the outer wall of the movable frame (11) via a bracket; the output shaft of the third motor (1301) drives the third grinding plate (13) to rotate, and the output shaft of the fourth motor (1401) drives the fourth grinding plate (14) to rotate.

4. The rapid prototyping equipment for steel pipes according to claim 3, characterized in that: Also includes: A collecting box (15) is fixed to an end portion of the fixed pipe rack (4) away from the first cylinder (6); An air inlet (16) is provided at the top of the collecting box (15), the air inlet (16) being bent at a right angle, with the right angle point facing the welding position of the steel pipe (19); A filter frame (17) is embedded through a side of the collecting box (15) facing away from the first welding head (8); A negative pressure pump (18) is fixed inside the fixed pipe rack (4), and an input end thereof is in communication with the filter frame (17).

5. A control method applicable to a steel tube rapid prototyping device, applicable to the steel tube rapid prototyping device as claimed in claim 4, characterized in that: A first pressure sensor and a second pressure sensor are respectively fixed to two ends of the top of one of the mounting brackets (1101) and two ends of the inner wall of the fixed pipe bracket (4); a speed sensor for detecting the speed of the steel pipe (19) is installed on the second bracket (2); and the control method comprises the following steps: A1. The control unit obtains the first pressure information from the first pressure sensor; A2. The control unit generates first drive information according to the first pressure information; A3. The control unit sends the first driving information to the outer welding component or the inner welding component corresponding to the first pressure sensor; A4. The control unit obtains second pressure information from the second pressure sensor; A5. The control unit generates second drive information according to the second pressure information; A6. The control unit sends the second driving information to the outer welding component or the inner welding component corresponding to the second pressure sensor.

6. A control method for steel tube rapid prototyping equipment according to claim 5, characterized in that: Also includes: B1. The control unit obtains speed information V1 from the speed sensor; B2. The control unit brings the speed information V1 into V2=3V1 to obtain the active drive speed V2; B3. The control unit generates a first driving speed V3 according to the active driving speed V2 and the first pressure information by substituting V3=V2, wherein the first driving information includes the first driving speed V3; B4. The control unit generates a first driving speed V4 according to the active driving speed V2 and the second pressure information by substituting V4=-V2, and the first driving information includes the first driving speed V4.

7. The control method for steel tube rapid prototyping equipment according to claim 5, characterized in that: Also includes: C1. The control unit obtains and generates polishing control information according to the second driving information, and the polishing control information is used to control the start-up of the polishing component; C2. The control unit sends the polishing control information to the polishing component.

8. A control method for steel tube rapid prototyping equipment according to claim 7, characterized in that: Also includes: D1. The control unit generates airflow control information according to the polishing control information, and the airflow control information is used to control the start-up of the negative pressure pump (18); D2. The control unit sends the airflow control information to the negative pressure pump (18).

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