Automatic correction mechanism of pipe welding machine

Abstract

The utility model discloses an automatic correcting mechanism of a pipe welding machine, which comprises a connecting frame, one end of the connecting frame is fixedly connected with a shaft rod, one end of the shaft rod is provided with a conical head, and a plurality of groups of elastic positioning components are arranged on the outer wall of the shaft rod along the length direction of the shaft rod. Each elastic positioning assembly comprises a plurality of positioning blocks and a moving plate matched with the positioning blocks, the positioning blocks are connected to the side wall of the shaft rod in a sliding mode, and the multiple positioning blocks in one elastic positioning assembly are arranged around the axis of the shaft rod in the circumferential direction in an array mode. The end, close to the axis of the shaft rod and extending into the shaft rod, of the positioning block is provided with an inclined face, a sliding barrel is fixed to the inner wall of the shaft rod, a sliding rod is slidably matched with the inner wall of the sliding barrel, and one end of the sliding rod is connected with a spring. According to the utility model, through the arrangement of the elastic positioning assembly, the coaxial positioning of the heat exchange tubes with different diameters is realized by utilizing the elastic position change of the positioning block, and the shaft rod does not need to be replaced during processing.

Description

TECHNICAL FIELD

[0001] The utility model relates to pipe welding machine technical field especially relates to pipe welding machine automatic correction mechanism. BACKGROUND

[0002] In chemical industry, air separation, light industry and other industries, various stainless steel coil pipe heat exchangers are widely used. After the heat exchange pipe of the coil pipe heat exchanger is wound, the two ends need to pass through the tube plate hole and be welded and sealed with the tube plate, and argon arc welding is generally used for stainless steel products. The tube plate welding can adopt manual argon arc welding and automatic argon arc welding, and the automatic tube plate welding mode is that the positioning mandrel is inserted into the tube hole for positioning, the motor on the welding head drives the welding handle to rotate, and welding processing is carried out. After welding processing of one hole plate, the welding head needs to be moved to insert the mandrel into another hole plate for welding of the next hole plate.

[0003] Through retrieval, the patent with patent publication number CN213672542U discloses a tube plate welding machine positioning support, which comprises three positioning claws for fixing on a shell, the three positioning claws are distributed along the circumference of the shell, the positioning claw comprises a first radial connecting arm and a first axial positioning arm, one end of the first radial connecting arm is fixed with the shell, the other end of the first radial connecting arm is provided with a first mounting hole, one end of the first axial positioning arm is inserted into the first mounting hole, and the first axial positioning arm is perpendicular to the first radial connecting arm, the other end of the first axial positioning arm forms a positioning part for contacting with the plate; the first mounting hole is a radial opening structure, a pressing plate is arranged at the radial opening of the first mounting hole, a fastener is arranged on the pressing plate and used for fastening the first axial positioning arm.

[0004] The diameters of the heat exchange pipes in different types of heat exchangers are different, and the diameters of the through holes on the tube plate are also different, so different positioning mandrels need to be replaced during use, which is inconvenient to use. UTILITY MODEL CONTENTS

[0005] The utility model discloses a pipe welding machine automatic correction mechanism that solves the shortcomings in the prior art.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0007] The pipe welding machine automatic correction mechanism comprises a connecting frame, one end of the connecting frame is fixedly connected with a shaft rod, one end of the shaft rod is provided with a conical head, a plurality of elastic positioning components are arranged on the outer wall of the shaft rod along the length direction of the shaft rod, the elastic positioning component comprises a plurality of positioning blocks and a moving plate matched with the positioning blocks, the positioning block is slidably connected to the side wall of the shaft rod, and a plurality of positioning blocks in one elastic positioning component are arranged in a circumferential array around the shaft axis.

[0008] The positioning block has an inclined surface at one end near the shaft axis and extending into the shaft, and an arc surface at the other end outside the shaft. The moving plate is coaxial with the shaft and slides with the inclined surfaces of the multiple positioning blocks. A sliding cylinder is fixed to the inner wall of the shaft, and a sliding rod is slidably fitted to the inner wall of the sliding cylinder. One end of the sliding rod is connected to the moving plate, and a spring is connected to one end of the sliding rod. The other end of the spring is connected to the bottom of the sliding cylinder.

[0009] As a further embodiment of this utility model: a protruding edge is provided on the outer wall of the shaft near the end of the connecting frame, and a connecting rod is connected to the outer wall of the connecting frame through a linear drive assembly, with a welding gun movably mounted on one end of the connecting rod.

[0010] As a further improvement of this utility model, the positioning blocks in the different elastic positioning components are staggered along the length of the shaft.

[0011] As a further embodiment of this utility model: the connecting frame includes a telescopic cylinder and a telescopic rod, one end of the telescopic cylinder is fixedly connected to a multi-axis moving mechanism, the telescopic rod is fixed to the inner wall of the telescopic cylinder, and the telescopic ends of the telescopic cylinder and the telescopic rod are connected to each other.

[0012] As a further embodiment of this utility model: the linear drive assembly includes a guide frame and a threaded rod, wherein the guide frame is fixed to the outer wall of the connecting frame at the end away from the shaft.

[0013] As a further embodiment of this utility model: the threaded rod is rotatably connected to the inner wall of the guide frame, the top end of the connecting rod is slidably engaged with the inner wall of the guide frame, and threadedly engaged with the outer wall of the threaded rod; a motor for driving the threaded rod to rotate is installed on one side of the outer wall of the guide frame.

[0014] As a further improvement of this utility model: at least one elastic positioning component has a distance sensor on one side of the sliding cylinder, and the distance sensor is used to collect the displacement of the detection plate.

[0015] Compared with the prior art, the present invention provides an automatic correction mechanism for pipe welding machines, which has the following advantages:

[0016] 1. This utility model, by setting an elastic positioning component, utilizes the elastic position change of the positioning block to achieve coaxial positioning of heat exchange tubes of different diameters, eliminating the need to replace the shaft during processing.

[0017] 2. By staggering the positioning blocks in multiple elastic positioning components, the contact area between the multiple elastic positioning components and the inner wall of the heat exchange tube can be more evenly distributed, thereby improving the positioning accuracy.

[0018] 3. This utility model, by setting a distance sensor and a linear drive assembly, detects the displacement of the moving plate during the movement of the moving plate. Since the displacement distance of the moving plate is positively correlated with the retraction distance of the positioning block, the retraction distance of the positioning block can be obtained by detecting the displacement of the moving plate, and then the diameter of the heat exchange tube can be obtained. Then the welding torch is moved to the welding position corresponding to the diameter of the heat exchange tube, thereby realizing the automatic adjustment of the welding torch position.

[0019] The parts of this device not covered herein are the same as or can be implemented using existing technologies. This utility model has a simple structure and is easy to operate. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the automatic correction mechanism for pipe welding machines proposed in this utility model;

[0021] Figure 2 This is a schematic diagram of the internal structure of the shaft of the automatic correction mechanism for the pipe welding machine proposed in this utility model;

[0022] Figure 3 This is a schematic diagram showing the cooperative structure of different elastic positioning components of the automatic correction mechanism for pipe welding machines proposed in this utility model;

[0023] Figure 4 This is a schematic diagram of the connecting frame of the automatic correction mechanism for pipe welding machines proposed in this utility model.

[0024] In the diagram: 1. Connecting frame; 2. Shaft; 3. Conical head; 4. Elastic positioning assembly; 5. Positioning block; 6. Moving plate; 7. Sliding cylinder; 8. Sliding rod; 9. Spring; 10. Distance sensor; 11. Telescopic cylinder; 12. Telescopic rod; 13. Linear drive assembly; 14. Connecting rod; 15. Welding torch; 16. Protruding edge; 17. Guide frame; 18. Threaded rod. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0026] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] Example 1

[0028] Automatic calibration mechanism for pipe welding machines, such as Figures 1 to 3 As shown, it includes a connecting frame 1, one end of which is fixedly connected to a shaft 2. One end of the shaft 2 is provided with a tapered head 3. The outer wall of the shaft 2 is provided with multiple sets of elastic positioning components 4 arranged in a row. The outer wall of the shaft 2 near the connecting frame 1 is provided with a protruding edge 16. The outer wall of the connecting frame 1 is connected to a connecting rod 14 through a linear drive component 13. A welding gun 15 is movably installed at the end of the connecting rod 14 away from the linear drive component 13. The welding gun 15 is used to weld the heat exchange tubes and plate holes.

[0029] The elastic positioning component 4 includes multiple positioning blocks 5 and a movable plate 6. The positioning blocks 5 are slidably connected to the side wall of the shaft 2. The multiple positioning blocks 5 are arranged in a circumferential array around the axis of the shaft 2. One end of the positioning block 5 near the axis of the shaft 2 and extending into the shaft 2 is set as an inclined surface, and the other end of the positioning block 5 extending out of the shaft 2 is an arc surface. For details, please refer to [link / reference needed]. Figure 3 The movable plate 6 is installed inside the shaft 2 and is coaxial with the shaft 2; the movable plate 6 is slidably engaged with the inclined surfaces of multiple positioning blocks 5; a sliding cylinder 7 is fixedly arranged coaxially on the inner wall of the shaft 2; a sliding rod 8 is slidably engaged on the inner wall of the sliding cylinder 7; one end of the sliding rod 8 is connected to the movable plate 6; one end of the sliding rod 8 is connected to a spring 9; and the other end of the spring 9 is connected to the sliding cylinder 7.

[0030] It should be noted that the design quantity of the elastic positioning component 4 is related to the usage requirements and the specifications of the shaft 2, so this application does not impose any special limitations; when the spring 9 is at its natural length, the end of the sliding rod 8 connected to the spring 9 is located inside the sliding cylinder 7 to prevent the sliding rod 8 from sliding off course.

[0031] The positioning blocks 5 in the different elastic positioning components 4 are staggered along the length of the shaft 2. The connecting frame 1 includes a telescopic cylinder 11 and a telescopic rod 12. One end of the telescopic cylinder 11 is fixedly connected to a multi-axis moving mechanism. The multi-axis moving mechanism is a mature existing technology and will not be described in detail here. The telescopic rod 12 is fixed to the inner wall of the telescopic cylinder 11. The telescopic ends of the telescopic cylinder 11 and the telescopic rod 12 are connected to each other to control the extension and retraction of the connecting frame 1, thereby realizing the extension and retraction of the automatic correction mechanism.

[0032] During positioning, the shaft 2 passes through the plate hole and is inserted into the heat exchange tube. The protruding edge 16 limits the insertion depth of 2. The inner wall of the heat exchange tube will squeeze the arc surface of the positioning block 5, causing the positioning block 5 to move closer to the axis of the shaft 2. The inclined surface of the positioning block 5 squeezes the moving plate 6, thereby compressing the spring 9, causing the sliding rod 8 to move upward along the sliding cylinder 7. The positioning block 5 fits against the inner wall of the corresponding heat exchange tube, realizing the concentric positioning of the heating tube and the tube plate hole. At the same time, the welding position of the welding gun 15 is adjusted according to the diameter of the heat exchange tube. After positioning is completed, the telescopic rod 12 retracts, causing the shaft 2 to move out of the heat exchange tube, avoiding the reduction of the inner wall diameter of the heat exchange tube caused by welding, which would make it difficult for the shaft 2 to move out of the heat exchange tube. Then the welding gun 15 performs welding. The staggered arrangement of the positioning blocks 5 in the multiple elastic positioning components 4 can make the contact area between the multiple elastic positioning components 4 and the inner wall of the heat exchange tube more uniform, improving the positioning accuracy.

[0033] As can be seen from the above description, the embodiments of this application, by setting up an elastic positioning component 4, utilize the elastic position change of the positioning block 5 to achieve coaxial positioning of heat exchange tubes of different diameters, so that the shaft 2 does not need to be replaced during processing; by staggering the positioning blocks 5 in multiple elastic positioning components 4, the contact area between multiple elastic positioning components 4 and the inner wall of the heat exchange tube can be more uniformly distributed, thereby improving the positioning accuracy.

[0034] Example 2

[0035] The automatic correction mechanism for the pipe welding machine, in this embodiment, is improved upon embodiment 1 by the following improvements: Figure 2 , Figure 4 As shown, the linear drive assembly 13 includes a guide frame 17 and a threaded rod 18. The guide frame 17 is fixed to the outer wall of the connecting frame 1 at the end away from the shaft 2. The threaded rod 18 is rotatably connected to the inner wall of the guide frame 17. A sliding groove extending along the length of the guide frame 17 is provided at the bottom of the guide frame 17. The top end of the connecting rod 14 extends into the guide frame 17 through the sliding groove and is threadedly engaged with the outer wall of the threaded rod 18. A motor for driving the threaded rod 18 to rotate is installed on one side of the outer wall of the guide frame 17. Thus, the threaded rod 18 can be driven to rotate by the motor, thereby causing the connecting rod 14 to slide along the length of the guide frame 17 in the sliding groove. In addition, a distance sensor 10 is provided at the sliding cylinder 7 on the side of at least one of the multiple elastic positioning assemblies 4.

[0036] During the movement of the moving plate 6, the distance sensor 10 is used to detect the displacement of the moving plate 6. Since the displacement distance of the moving plate 6 is positively correlated with the retraction distance of the positioning block 5, the retraction distance of the positioning block 5 can be obtained by detecting the displacement of the moving plate 6, and then the diameter of the heat exchange tube can be obtained. At this time, the motor drives the threaded rod 18 to rotate, which drives the connecting rod 14 to move along the guide frame 17, changes the position of the welding gun 15, and moves the welding gun 15 to the welding position corresponding to the diameter of the heat exchange tube.

[0037] By setting a distance sensor 10 and a linear drive assembly 13, the distance sensor 10 detects the displacement of the moving plate 6 during its movement. Since the displacement distance of the moving plate 6 is positively correlated with the retraction distance of the positioning block 5, the retraction distance of the positioning block 5 can be obtained by detecting the displacement of the moving plate 6, and thus the diameter of the heat exchange tube can be obtained. Then, the welding torch 15 is moved to the welding position corresponding to the diameter of the heat exchange tube, thereby realizing the automatic adjustment of the position of the welding torch 15 and improving the welding efficiency.

[0038] Working principle: During positioning, shaft 2 passes through the plate hole and is inserted into the heat exchange tube. The protruding edge 16 limits the insertion depth of 2. The inner wall of the heat exchange tube will press the arc surface of the positioning block 5, causing the positioning block 5 to move closer to the axis of shaft 2. The inclined surface of the positioning block 5 presses the moving plate 6, thereby compressing the spring 9, causing the sliding rod 8 to move upward along the sliding cylinder 7. The positioning block 5 fits against the inner wall of the corresponding heat exchange tube, realizing the concentric positioning of the heating tube and the tube plate hole. At the same time, the distance sensor 10 detects the displacement of the moving plate 6. Since the displacement distance of the moving plate 6 is positively correlated with the retraction distance of the positioning block 5, the positioning can be obtained by detecting the displacement of the moving plate 6. The contraction distance of block 5 is used to obtain the diameter of the heat exchange tube. At this time, the motor drives the threaded rod 18 to rotate, which drives the connecting rod 14 to move along the guide frame 17, changing the position of the welding gun 15, so that the welding gun 15 moves to the welding position corresponding to the diameter of the heat exchange tube. After positioning, the telescopic rod 12 retracts, so that the shaft 2 is moved out of the heat exchange tube, avoiding the reduction of the inner wall diameter of the heat exchange tube caused by welding, which would make it difficult for the shaft 2 to be moved out of the heat exchange tube. Then the welding gun 15 performs welding. The staggered arrangement of positioning blocks 5 in multiple elastic positioning components 4 can make the contact area between multiple elastic positioning components 4 and the inner wall of the heat exchange tube more uniform, thus improving the positioning accuracy.

[0039] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. Automatic correction mechanism for tube welding machines, comprising a connecting frame (1), characterized in that, The connecting frame (1) is fixedly connected with a shaft rod (2) at one end, the shaft rod (2) is provided with a conical head (3) at one end, a plurality of elastic positioning assemblies (4) are arranged on the outer wall of the shaft rod (2) along the length direction, the elastic positioning assembly (4) comprises a plurality of positioning blocks (5) and a moving plate (6) matched with each positioning block (5); the positioning block (5) is slidably connected to the side wall of the shaft rod (2), and a plurality of positioning blocks (5) in one elastic positioning assembly (4) are arranged in a circumferential array around the axis of the shaft rod (2). Wherein, the end of the positioning block (5) close to the axis of the shaft rod (2) and extending into the shaft rod (2) is provided with an inclined surface, and the other end of the positioning block (5) located outside the shaft rod (2) is provided with a circular arc surface; the moving plate (6) is coaxially arranged with the shaft rod (2) and slidably matched with the inclined surface of the plurality of positioning blocks (5), the inner wall of the shaft rod (2) is fixedly provided with a sliding cylinder (7), the inner wall of the sliding cylinder (7) is slidably matched with a sliding rod (8), one end of the sliding rod (8) is connected with the moving plate (6), one end of the sliding rod (8) is connected with a spring (9), and the other end of the spring (9) is connected with the bottom of the sliding cylinder (7).

2. The tube welder automatic correction mechanism of claim 1, wherein, The outer wall of the shaft rod (2) is provided with a convex edge (16) close to one end of the connecting frame (1), the outer wall of the connecting frame (1) is connected with a connecting rod (14) through a linear drive assembly (13), and the welding gun (15) is movably mounted at one end of the connecting rod (14).

3. The tube welder automatic correction mechanism of claim 1, wherein, The positioning blocks (5) in different elastic positioning assemblies (4) are arranged in a staggered manner in the length direction of the shaft rod (2).

4. The tube welder automatic correction mechanism of claim 3, wherein, The connecting frame (1) comprises a telescopic cylinder (11) and a telescopic rod (12), one end of the telescopic cylinder (11) is fixedly connected with the multi-shaft moving mechanism; the telescopic rod (12) is fixed to the inner wall of the telescopic cylinder (11), and the telescopic ends of the telescopic cylinder (11) and the telescopic rod (12) are connected with each other.

5. The tube welder automatic correction mechanism of claim 2, wherein, The linear drive assembly (13) comprises a guide frame (17) and a threaded rod (18), the guide frame (17) is fixed to the outer wall of the connecting frame (1) away from the shaft rod (2) at one end.

6. The tube welder automatic correction mechanism of claim 5, wherein, The threaded rod (18) is rotatably connected to the inner wall of the guide frame (17), the top end of the connecting rod (14) is slidably matched with the inner wall of the guide frame (17) and is threadedly matched with the outer wall of the threaded rod (18); a motor for driving the threaded rod (18) to rotate is mounted on one side of the outer wall of the guide frame (17).

7. The tube welder automatic correction mechanism of claim 5, wherein, A distance sensor (10) is arranged on one side of the sliding cylinder (7) in at least one elastic positioning assembly (4), and the distance sensor (10) is used to collect the displacement of the moving plate (6).

Images