Tube plate automatic welding positioning device

Abstract

The invention relates to the technical field of tube plate welding and positioning, and particularly discloses an automatic welding and positioning device for a tube plate. The device comprises a sliding shaft and a positioning head, the whole sliding shaft is of a cylindrical structure, one end of the sliding shaft is provided with a U-shaped protruding part, and the longitudinal section of the side edge of the U-shaped protruding part is conical; the positioning head comprises a positioning head shell, a connecting shaft, an expansion pin and a conical block, the conical block is U-shaped, the longitudinal section of the side edge of the conical block is conical, and the sliding shaft is connected with the conical block through the connecting shaft; the U-shaped protruding part of the sliding shaft, the connecting shaft and the conical block are wrapped with a positioning head shell, expansion holes are evenly formed in the positions, corresponding to the U-shaped protruding part of the sliding shaft and the conical block, of the positioning head shell in the circumferential direction, and each expansion hole is provided with an expansion pin. The device is easy to install and high in applicability, the positioning precision and reliability of the tube plate sealing welding equipment are improved, and the welding quality is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of tube sheet welding positioning, and in particular relates to a tube sheet automatic welding positioning device. Background Art

[0002] In the fields of electricity, petrochemicals, etc., heat exchangers generally adopt a tube sheet structure, and the cooling of the medium inside the tube is achieved through the medium outside the tube. The tube sheet sealing weld is a sealing boundary, and its welding quality directly affects the safe operation of the heat exchanger. The welding quality requirements of the tube sheet sealing weld are high. At the same time, the number of tube sheet sealing welds is large. At present, most tube sheet sealing welds are welded automatically. First, the positioning device is inserted into the tube and locked, and the entire automatic welding equipment is fixed on the workpiece. The sealing welding of the tube sheet is achieved by rotating the tungsten needle. The main function of the positioning device is to position the automatic welding equipment at the pipe mouth and to reliably fix the whole, which has a great influence on the welding quality.

[0003] At present, the positioning device of the tube sheet sealing welding equipment generally adopts a structure such as an elastic expansion core, and the positioning device and the tube are fixed by expanding under its own force. This method has the following problems:

[0004] (1) Uneven circumferential expansion. Due to the petal structure, after being squeezed and expanded by the expansion rod, the circumferential expansion is uneven and cannot be close to the inner wall of the tube in a full circle, resulting in partial looseness.

[0005] (2) Uneven expansion at the front and rear ends. After the expansion rod squeezes the elastic expansion core, it is easy to cause the rear end of the expansion core to open too much. During the welding process, the support is insufficient and it is easy to tilt.

[0006] (3) Limited expansion range and poor adaptability. The elastic expansion core expands by its own force, and its expansion is limited. It can only adapt to pipes of a certain specification. At the same time, since the inner diameter of the pipe mouth becomes smaller after the sealing weld is completed, the expansion core cannot be removed from the pipe. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide a tube sheet automatic welding positioning device to solve the problems of the tungsten electrode circular motion being non-concentric with the weld pipe and the unstable vibration of the equipment during the welding process of the tube sheet sealing welding equipment.

[0008] In order to solve the above problems, the technical solution of the present invention is as follows: a tube sheet automatic welding positioning device, the device includes a sliding shaft and a positioning head, the sliding shaft is an overall cylindrical structure, one end is provided with a U-shaped protrusion, the side longitudinal section of the U-shaped protrusion is conical; the positioning head includes a positioning head shell, a connecting shaft, a tightening pin, and a conical block, the conical block is U-shaped, the side longitudinal section is conical, and the sliding shaft is connected to the conical block through the connecting shaft; the U-shaped protrusion of the sliding shaft, the connecting shaft and the conical block are covered with a positioning head shell, and the positioning head shell is circumferentially evenly provided with tightening holes at the corresponding positions of the U-shaped protrusion of the sliding shaft and the conical block, and each tightening hole is provided with an tightening pin.

[0009] The device also includes a push rod, a shell, and a transmission connection part; the push rod is covered with a shell on the outside, the push rod is provided with a thread on the outer surface, and the inner part of the shell that contacts the push rod is provided with a thread that matches the outer surface of the push rod; the transmission connection part is arranged in the shell, and includes a retaining spring, a bearing, a sleeve, an adapter sleeve, and a lock nut; the outer sleeve of one end of the push rod is provided with a sleeve, the outer sleeve of the sleeve is provided with a bearing, the bearing is fixed in the adapter sleeve by a retaining spring, and the end of the push rod is provided with a lock nut; the adapter sleeve is connected to the sliding shaft by a thread.

[0010] The positioning head shell includes a first ring, a fixed ring sleeve, and a second ring. The first ring is connected to the fixed ring sleeve by a plurality of first limit pins, and the first limit pins pass through the expansion hole and the expansion pin along the radial direction of the expansion hole; the second ring is connected to the fixed ring sleeve by a plurality of second limit pins, and the second limit pins pass through the expansion hole and the expansion pin along the radial direction of the expansion hole.

[0011] The side of the expansion pin facing the axial center of the positioning head is an inclined surface structure.

[0012] The sliding shaft is covered with a flange sleeve on the outside, one end of the flange sleeve is connected to the shell through bolts, and the other end of the flange sleeve is connected to the positioning head through bolts.

[0013] A pressure cap is provided at one end of the conical block.

[0014] A hand wheel is arranged at one end of the pushing rod.

[0015] The number of the first limiting pins is four, and the number of the second limiting pins is four.

[0016] The remarkable effects of the present invention are as follows: the tube sheet automatic welding positioning device described in the present invention adopts the conical surface force transmission principle to realize the ejection and contraction of the expansion pin, ensures the consistency and synchronization of expansion, improves the positioning accuracy and reliability of the tube sheet sealing welding equipment, and ensures the welding quality; adopts a mechanical connection transmission method, which is simple to install and can quickly realize the positioning of the tube sheet sealing welding equipment; at the same time, the expansion pin has a U-shaped groove structure on both sides, which cooperates with the limit pin to ensure the normal operation of the expansion pin; through the conical structure design of the sliding shaft and the conical block, the expansion pin has a large expansion and contraction amount and can cover a variety of pipe diameters. At the same time, it is ensured that when the inner diameter of the pipe mouth becomes smaller after welding is completed, the positioning head can be easily removed from the welded pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a cross-sectional view of a tube sheet automatic welding positioning device according to the present invention;

[0018] Figure 2 This is a cross-sectional view of a positioning head of a tube sheet automatic welding positioning device according to the present invention;

[0019] Figure 3 This is a schematic structural diagram of a tube sheet automatic welding positioning device according to the present invention;

[0020] Figure 4 This is a schematic diagram of the flange sleeve structure of a tube sheet automatic welding positioning device according to the present invention;

[0021] Figure 5 This is a cross-sectional view of a flange sleeve of a tube sheet automatic welding positioning device according to the present invention;

[0022] Figure 6 This is a schematic diagram of the expansion pin structure of a tube sheet automatic welding positioning device according to the present invention;

[0023] In the figure: 1. hand wheel; 2. push rod; 3. housing; 4. retaining ring; 5. bearing; 6. bushing; 7. adapter sleeve; 8. anti-loosening nut; 9. flange sleeve; 10. sliding shaft; 11. positioning head; 12. first ring; 13. fixing ring sleeve; 14. connecting shaft; 15. expansion pin; 16. second ring; 17. pressure cap; 18. tapered block; 19. first limit pin; 20. second limit pin. DETAILED DESCRIPTION

[0024] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of the present invention.

[0025] In the description of the present invention, it should be noted that the directions or positional relationships indicated by “upper” and the like are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience and simplification of the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0026] In the description of the present invention, the terms “first” and “second” are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connect", "set", "install", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0028] like Figure 1-6 As shown, a tube sheet automatic welding positioning device, the device includes a push rod 2, a transmission connection part, a sliding shaft 10, and a positioning head 11, the push rod 2, the transmission connection part, the sliding shaft 10, and the positioning head 11 are connected in sequence from left to right, the push rod 2 and the transmission connection part are covered with a shell 3 on the outside, the outer surface of the push rod 2 is provided with a thread, and the contact part of the shell 3 inside the push rod 2 is provided with a thread matching the outer surface of the push rod 2, so that the push rod 2 can move into or out of the shell 3 when rotating clockwise or counterclockwise; the connecting part is arranged at the right end of the push rod 2, and the connecting part includes a retaining spring 4, a bearing 5, a sleeve 6, an adapter sleeve 7, and a lock nut 8. The outer sleeve of the right end of the push rod 2 is provided with a sleeve 6, and the outer sleeve of the sleeve 6 is provided with a bearing 5, and the bearing 5 is fixed in the adapter sleeve 7 by the retaining spring 4. The end of the push rod 2 is provided with a lock nut 8, which, on the one hand, prevents the sleeve 6 and the bearing 5 from being separated from the push rod 2, and on the other hand, prevents the push rod 2 from moving while rotating relative to the adapter sleeve 7;

[0029] The adapter sleeve 7 is connected to the sliding shaft 10 through a thread. By rotating the push rod 2, the push rod 2 moves from left to right relative to the housing 3 in a spiral forward manner, thereby pushing the sliding shaft 10 to move rightward; the sliding shaft 10 is a columnar structure as a whole, and a U-shaped protrusion is provided at the right end. The longitudinal section of the side of the U-shaped protrusion is conical, and the diameter of the contact end of the U-shaped protrusion with the sliding shaft 10 is larger than the diameter of the end of the U-shaped protrusion away from the sliding shaft 10; the left end of the sliding shaft 10 is arranged inside the housing 3, the middle part is covered with a flange sleeve 9, and the right end is inserted into the positioning head 11; the flange sleeve 9 is fixedly connected to the housing 3 by bolts;

[0030] The positioning head 11 includes a positioning head housing, a connecting shaft 14, a tightening pin 15, a conical block 18, a first limiting pin 19, and a second limiting pin 20. The conical block 18 is U-shaped, and the longitudinal section of the side is conical. The diameter of the end of the conical block 18 in contact with the connecting shaft 14 is larger than the diameter of the end of the conical block 18 away from the connecting shaft 14. The sliding shaft 10 is connected to the conical block 18 through the connecting shaft 14, so that the conical block 18 can move synchronously with the sliding shaft 10. As an embodiment, a pressure cap 17 is provided at the right end of the conical block 18 to achieve sealing of the positioning head 11.

[0031] The positioning head shell includes a first sleeve 12, a fixed sleeve 13, and a second sleeve 16. The first sleeve 12 is connected to the fixed sleeve 13 by a plurality of first limit pins 19. As an embodiment, the number of the first limit pins 19 is 4, which are evenly distributed circumferentially between the first sleeve 12 and the fixed sleeve 13; the first sleeve 12 is evenly provided with a plurality of first expansion holes circumferentially, and each expansion hole is provided with a expansion pin 15. As an embodiment, the number of the first expansion holes is 4; the expansion pin 15 is an inclined surface structure on the inner side of the positioning head, and the inclined surface angle matches the contact surface between the expansion pin 15 and the U-shaped protrusion of the sliding shaft 10, and the inclined surface angle matches the contact surface between the expansion pin 15 and the conical block 18. A U-shaped groove is provided on the side of the expansion pin 15, and the first limit pin 19 passes through one end of the expansion pin 15 and is inserted into the notch to limit the movement of the expansion pin 15 and prevent the expansion pin 15 from falling off from the first sleeve 12;

[0032] The second ring 16 is connected to the fixed ring sleeve 13 through a plurality of second limit pins 20. As an embodiment, the number of the second limit pins 20 is 4, which are evenly distributed circumferentially between the second ring 16 and the fixed ring sleeve 13; the second ring 16 is evenly provided with a plurality of second tightening holes circumferentially, and each tightening hole is provided with a tightening pin 15. As an embodiment, the number of the second tightening holes is 4; the second limit pin 20 passes through one end of the tightening pin 15 and is inserted into the slot to limit the movement of the tightening pin 15 and prevent the tightening pin 15 from falling off the second ring 16.

[0033] The flange sleeve 9 is fixedly connected to the positioning head housing by bolts. Specifically, the flange sleeve 9 is fixedly connected to the first collar 12 by bolts.

[0034] As an embodiment, a hand wheel 1 is provided at the left end of the push rod 2 to facilitate the rotation of the push rod 2;

[0035] By rotating the handwheel 1, the push rod 2 is driven, and the push rod 2 passes through the sliding shaft 10, and pushes the connecting shaft 14 and the tapered block 18 to move in turn. Since the right end of the sliding shaft 10 and the tapered block 18 are tapered surfaces, when moving to the right, the tapered surface pushes the expansion pin 15 to move away from the positioning head 11, thereby achieving the expansion, positioning and fixing of the positioning head 11 to the inner side of the welding pipe; when moving to the left, the expansion pin 15 contracts toward the inside of the positioning head, thereby achieving the separation of the positioning head from the welding pipe.

[0036] The specific usage of the device is as follows:

[0037] The specific implementation steps are as follows:

[0038] 1) Assemble the tube sheet automatic welding positioning device;

[0039] 2) By rotating the hand wheel 1, observe the tooling status of the expansion pin 15 to ensure that the tube sheet automatic welding positioning device operates reliably;

[0040] 3) Determine the required welding tube sheet hole position and insert the positioning head 11 into the welded tube;

[0041] 4) Rotate the hand wheel 1 to push the sliding shaft 10 forward, and the front end conical surface of the sliding shaft 10 and the conical block 18 push out the expansion pin 15, so that the positioning head 11 can expand, position and fix the inner side of the welding pipe;

[0042] 5) Operate the tube sheet sealing welding equipment to rotate, observe whether the welding equipment shakes, and ensure that the tube sheet automatic welding positioning device is installed reliably;

[0043] 6) Start welding until the tube sheet sealing weld is completed;

[0044] 7) Rotate the hand wheel 1 to push the sliding shaft 10 backward, and the expansion pin 15 contracts, thereby realizing the separation of the tube sheet sealing automatic welding equipment from the tube sheet;

[0045] 8) The welding process repeats steps 2 to 7 until the entire welding is completed.

[0046] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A tube sheet automatic welding positioning device, characterized in that: The device comprises a sliding shaft (10) and a positioning head (11); the sliding shaft (10) is in a cylindrical structure as a whole, and a U-shaped protrusion is provided at one end, and the longitudinal section of the side of the U-shaped protrusion is conical; the positioning head (11) comprises a positioning head shell, a connecting shaft (14), a tightening pin (15), and a conical block (18); the conical block (18) is U-shaped, and the longitudinal section of the side is conical; the sliding shaft (10) is connected to the conical block (18) through the connecting shaft (14); the U-shaped protrusion of the sliding shaft (10), the connecting shaft (14) and the conical block (18) are covered with a positioning head shell, and the positioning head shell is evenly provided with tightening holes at the corresponding positions of the U-shaped protrusion of the sliding shaft (10) and the conical block (18) in the circumferential direction, and each tightening hole is provided with an tightening pin (15).

2. The tube sheet automatic welding positioning device according to claim 1, characterized in that: The device also includes a push rod (2), a shell (3), and a transmission connection part; the push rod (2) is covered with the shell (3) on the outside, the push rod (2) is provided with a thread on the outer surface, and the inside of the shell (3) that contacts the push rod (2) is provided with a thread that matches the outer surface of the push rod (2); the transmission connection part is arranged in the shell (3), and includes a retaining spring (4), a bearing (5), a shaft sleeve (6), an adapter sleeve (7), and a lock nut (8); one end of the push rod (2) is provided with a shaft sleeve (6) on the outside, the shaft sleeve (6) is provided with a bearing (5) on the outside, the bearing (5) is fixed in the adapter sleeve (7) by the retaining spring (4), and the end of the push rod (2) is provided with a lock nut (8); the adapter sleeve (7) is connected to the sliding shaft (10) by a thread.

3. The tube sheet automatic welding positioning device according to claim 1, characterized in that: The positioning head shell comprises a first sleeve (12), a fixed sleeve (13), and a second sleeve (16); the first sleeve (12) and the fixed sleeve (13) are connected via a plurality of first limit pins (19); the first limit pins (19) pass through the expansion hole and the expansion pin (15) along the radial direction of the expansion hole; the second sleeve (16) and the fixed sleeve (13) are connected via a plurality of second limit pins (20); the second limit pins (20) pass through the expansion hole and the expansion pin (15) along the radial direction of the expansion hole.

4. The tube sheet automatic welding positioning device according to claim 3 is characterized in that: The side of the expansion pin (15) facing the axial center of the positioning head (11) is an inclined surface structure.

5. The tube sheet automatic welding positioning device according to claim 2, characterized in that: The sliding shaft (10) is covered with a flange sleeve (9) on the outside. One end of the flange sleeve (9) is connected to the housing (3) via bolts, and the other end is connected to the positioning head (11) via bolts.

6. The tube sheet automatic welding positioning device according to claim 1, characterized in that: A pressure cap (17) is provided at one end of the conical block (18).

7. The tube sheet automatic welding positioning device according to claim 2, characterized in that: A hand wheel (1) is provided at one end of the push rod (2).

8. The tube sheet automatic welding positioning device according to claim 3 is characterized by: The number of the first limiting pins (19) is four, and the number of the second limiting pins (20) is four.

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