Device for girth welding between tube plate and short section

Abstract

A device for girth welding between a tube plate and a short section comprises an annular guide rail (1) which is used for being arranged on the periphery of the short section (2) in a sleeving mode in the circumferential direction and is coaxially arranged with the short section (2); the trolley (3) is arranged on the periphery of the guide rail (1) and can move in the circumferential direction of the guide rail (1) under the driving of a driving mechanism; the connecting rod (4) and the trolley (3) are restrained together, and the connecting rod (4) penetrates through the inner periphery of the guide rail (1) in the axial direction, so that the first end part of the connecting rod (4) can extend into the short section (2) and is opposite to the tube plate; and the welding gun (5) is arranged at the first end part of the connecting rod (4), and a gun head of the welding gun (5) corresponds to a circular seam between the short section (2) and the tube plate. Compared with the prior art, the welding efficiency and the welding seam quality can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of welding, and in particular relates to a device for welding annular seams between a tube sheet and a short section. Background Art

[0002] The annular seam formed between the lateral tube sheet and the inner hole of the short section on the existing heat exchanger can only adopt the inner groove due to structural design reasons. This form of groove welding faces the following problems:

[0003] 1. Currently, manual welding is used. Due to the small welding space, welding is difficult and the welder's labor intensity is high; and the weld quality is difficult to control;

[0004] 2. The weldment is fully fixed-mouth welded, and there are many weld joints, resulting in low welding efficiency. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a device for welding the circumferential seam between a tube sheet and a short section in view of the current status of the prior art, so as to improve the welding efficiency and the weld quality.

[0006] The technical solution adopted by the utility model to solve the above technical problems is: a device for welding the annular seam between a tube sheet and a short section, comprising:

[0007] A welding gun, the gun head of which is used to correspond to the annular seam between the short section and the tube sheet;

[0008] It is characterized by also including:

[0009] The annular guide rail is used to be sleeved on the outer periphery of the short section along the circumferential direction and arranged coaxially with the short section;

[0010] The trolley is arranged on the periphery of the guide rail and can move along the circumference of the guide rail under the drive of the driving mechanism;

[0011] A connecting rod constrained with the trolley is axially arranged through the inner periphery of the guide rail so that the first end of the connecting rod can extend into the short section and face the tube sheet;

[0012] The welding gun is arranged at the first end portion of the connecting rod.

[0013] In this way, when it is necessary to weld the annular seam between the tube sheet and the short section, the guide rail can be sleeved on the outer periphery of the short section, and the first end of the connecting rod can be extended into the short section, so that the gun head of the welding gun on the first end can be welded corresponding to the annular seam. During the welding process, the circumferential movement of the trolley drives the gun head of the welding gun to move circumferentially along the annular seam to complete the welding of the weld, which is easy to operate, can improve the welding efficiency and ensure the welding quality.

[0014] In order to enable the position of the welding gun head to be adjusted according to the position of the annular seam, preferably, the connecting rod is connected to the first power mechanism and is constrained together with the trolley in an axially movable manner.

[0015] Furthermore, the connecting rod is connected to the second power mechanism and is constrained together with the trolley in a manner that it can move radially along the guide rail, thereby being suitable for welding of annular seams of different diameters.

[0016] Furthermore, it also includes a detection member for detecting the position of the welding gun head relative to the annular seam, and a controller connected to the output end of the detection member, and the output end of the controller is connected to the first power mechanism and the second power mechanism. Thus, the position of the gun head can be monitored and adjusted in real time, thereby further ensuring the welding effect.

[0017] In order to enable the trolley to move circumferentially along the guide rail under the drive of the driving mechanism, further, a circle of racks is provided on the outer circumference of the guide rail, and a gear is meshed on the rack. The driving mechanism is fixed relative to the trolley, and the output end of the driving mechanism is connected to the gear to drive the gear to rotate and drive the trolley to move.

[0018] Furthermore, it also includes a wire feeding mechanism, which is arranged on the connecting rod and is used to feed the welding wire to the gun head of the welding gun.

[0019] In the above schemes, preferably, the welding is TIG welding.

[0020] Preferably, a plurality of radially extending springs are provided at intervals along the circumferential direction on the inner circumferential surface of the guide rail, and the inner end of each spring is used to support the outer circumferential surface of the short section. The design of the spring forms an annular gap between the inner circumferential surface of the guide rail and the outer circumferential surface of the short section to prevent the guide rail from directly contacting the short section. The spring can be expanded and contracted according to the radial size of the short section, so that the guide rail is constrained on the outer circumference of the short section more stably.

[0021] Compared with the prior art, the utility model has the advantages that when the annular seam between the tube sheet and the short section needs to be welded, the guide rail can be sleeved on the outer periphery of the short section, and the first end of the connecting rod can be extended into the short section, so that the gun head of the welding gun on the first end can be welded corresponding to the annular seam. During the welding process, the gun head of the welding gun is driven to move circumferentially along the annular seam by the circumferential movement of the trolley to complete the welding of the weld, which is easy to operate, can improve the welding efficiency and ensure the welding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a diagram of the use state of an embodiment of the utility model (the tube sheet is omitted);

[0023] Figure 2 This is a diagram of the use status of an embodiment of the utility model from another perspective (the tube sheet is omitted). DETAILED DESCRIPTION

[0024] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0025] like Figure 1 and 2 As shown, a preferred embodiment of a device for annular seam welding between a tube sheet and a short section of the utility model is shown, wherein the above-mentioned welding is TIG welding, and the device for realizing welding includes a guide rail 1, a trolley 3, a connecting rod 4, a welding gun 5 and a wire feeding mechanism.

[0026] The guide rail 1 is in a circular shape, which is circumferentially sleeved on the outer circumference of the short section 2 and arranged coaxially with the short section 2; and a plurality of radially extending springs 6 are circumferentially spaced on the inner circumference of the guide rail 1, and the inner end of each spring 6 is used to support the outer circumference of the short section 2, so that the inner circumference of the guide rail 1 and the outer circumference of the short section 2 are spaced opposite to each other.

[0027] The trolley 3 is arranged at the periphery of the guide rail 1, and can move circumferentially along the guide rail 1 under the drive of the driving mechanism. Specifically, a circle of racks 11 are provided on the outer peripheral surface of the guide rail 1, and a gear is meshed on the rack 11. The driving mechanism is an existing motor, the motor is fixed relative to the trolley 3, and the output end of the motor is connected to the gear to drive the gear to rotate and drive the trolley 3 to move. In this embodiment, the motor and the gear are both existing structures and are not shown in the figure.

[0028] The connecting rod 4 is axially penetrated in the inner periphery of the guide rail 1, so that the first end of the connecting rod 4 can extend into the short section 2 and face the tube sheet; and the connecting rod 4 is simultaneously constrained with the trolley 3 in a manner that it can move axially and radially along the guide rail 1. In this embodiment, the connecting rod 4 is connected to the trolley 3 through a slider assembly 41, the first slider in the slider assembly 41 is constrained to the trolley 3 in a manner that it can move axially along the guide rail 1, and the second slider in the slider assembly is constrained to the first slider in a manner that it can move radially along the guide rail 1 and is connected to the connecting rod 4, so that the connecting rod 4 can move axially relative to the guide rail 1 and can also move radially relative to the guide rail 1. In order to drive the connecting rod 4 to move, a first power mechanism and a second power mechanism are provided, the first power mechanism is provided on the trolley 3, and the output end of the first power mechanism acts on the first slider to drive the first slider to move; the second power mechanism is provided on the first slider, and the output end of the second power mechanism acts on the second slider to drive the second slider to move. In this embodiment, the first power mechanism and the second power mechanism can adopt existing telescopic parts such as electric cylinders and hydraulic cylinders.

[0029] The welding gun 5 is disposed at the first end of the connecting rod 4, and the head of the welding gun 5 is used to correspond to the annular seam between the short section 2 and the tube sheet.

[0030] In order to improve the welding quality, the present embodiment further includes a detection member for detecting the position of the gun head of the welding gun 5 relative to the annular seam, and a controller connected to the output end of the detection member, and the output end of the controller is connected to the first power mechanism and the second power mechanism. Thus, the position of the gun head can be monitored and adjusted in real time, thereby further ensuring the welding effect.

[0031] The wire feeding mechanism is arranged on the connecting rod 4, and is used to feed the welding wire to the gun head of the welding gun 5. The wire feeding mechanism is a prior art, and its specific structure is not described in detail here.

[0032] When it is necessary to weld the annular seam between the tube sheet and the short section 2, the guide rail 1 can be sleeved on the outer periphery of the short section 2, and the first end of the connecting rod 4 can be extended into the short section 2, so that the gun head of the welding gun 5 on the first end can be welded corresponding to the annular seam. During the welding process, the circumferential movement of the trolley 3 drives the gun head of the welding gun 5 to move circumferentially along the annular seam to complete the welding of the weld, which is easy to operate, can improve the welding efficiency and ensure the welding quality.

[0033] At the same time, by equipping guide rails with different inner diameters, welding between short sections with different diameters and tube sheets can be achieved. Specifically, inner hole welds with a welding diameter of ≥300 mm can be achieved.

Claims

1. A device for welding annular seams between tube sheets and short sections, comprising: A welding gun (5), the gun head of which is used to correspond to the annular seam between the short section (2) and the tube sheet; Features Also included are: An annular guide rail (1) is used to be sleeved on the outer periphery of the short section (2) along the circumferential direction and arranged coaxially with the short section (2); A trolley (3) is arranged on the periphery of the guide rail (1) and can move along the circumference of the guide rail (1) under the drive of a driving mechanism; A connecting rod (4) constrained with the trolley (3) is axially penetrated through the inner periphery of the guide rail (1), so that a first end of the connecting rod (4) can extend into the short section (2) and face the tube sheet; The welding gun (5) is arranged at the first end of the connecting rod (4).

2. The device according to claim 1, characterized in that: The connecting rod (4) is connected to the first power mechanism and is constrained together with the trolley (3) in an axially movable manner.

3. The device according to claim 2, characterized in that: The connecting rod (4) is connected to the second power mechanism and is simultaneously constrained to the trolley (3) in a manner that allows it to move radially along the guide rail (1).

4. The device according to claim 3, characterized in that: It also includes a detection component for detecting the position of the welding gun (5) head relative to the annular seam, and a controller connected to the output end of the detection component, wherein the output end of the controller is connected to the first power mechanism and the second power mechanism.

5. The device according to claim 1, characterized in that: The outer peripheral surface of the guide rail (1) is provided with a circle of racks (11), and a gear is meshed on the racks (11). The driving mechanism is fixed relative to the trolley (3), and the output end of the driving mechanism is connected to the gear to drive the gear to rotate and drive the trolley (3) to move.

6. The device according to claim 1, characterized in that: It also includes a wire feeding mechanism, which is arranged on the connecting rod (4) and is used to feed the welding wire to the gun head of the welding gun (5).

7. The device according to any one of claims 1 to 6, characterized in that: The welding is TIG welding.

8. The device according to any one of claims 1 to 6, characterized in that: A plurality of radially extending springs (6) are arranged at intervals along the circumferential direction on the inner circumferential surface of the guide rail (1), and the inner end of each spring (6) is used to support the outer circumferential surface of the short section (2).

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