Variable-diameter welding tool clamp

Abstract

The utility model provides a variable-diameter welding tool clamp. The variable-diameter welding tool clamp comprises an inner shaft, an outer shaft, a first clamping part and a second clamping part. The first clamping part and the second clamping part are installed on the inner shaft and the outer shaft correspondingly, the first clamping part and the second clamping part extend into the first tubular part and the second tubular part correspondingly, the first sliding block moves along the inner shaft to drive the second supporting rod to move, and the supporting height of the first clamping part can be changed; therefore, the top of the first clamping piece clamps and loosens the inner wall of the first tubular piece; the second sliding block moves along the outer shaft to drive the fourth supporting rod to move, the supporting height of the second clamping piece can be changed, and therefore the top of the second clamping piece clamps and loosens the inner wall of the second tubular piece, and the tubular piece to be welded is positioned and clamped. The welding tool clamp is simple in structure, convenient to operate, high in assembly efficiency, high in positioning precision, capable of improving the subsequent welding quality and suitable for welding of various tubular parts.

Description

Technical Field

[0001] The utility model belongs to the technical field of welding tooling, and in particular relates to a diameter-variable welding tooling fixture. Background Art

[0002] Welding fixtures are devices used to accurately position and clamp weldments, ensuring structural accuracy and facilitating welding. Their primary functions include improving welding quality, increasing production efficiency, reducing labor intensity, and ensuring weld consistency. In modern welding production, the active use and promotion of fixtures tailored to product structure plays a crucial role in improving product quality, reducing worker labor intensity, and accelerating the mechanization and automation of welding production.

[0003] Existing fixtures and assembly methods are generally complex to operate, often using bolts for rigid fastening. This leads to drawbacks such as low assembly efficiency, high labor intensity, and poor assembly quality. Assembly accuracy directly impacts welding quality, necessitating the design of safe, practical, and easy-to-use assembly fixtures to adapt to welding tasks. Utility Model Content

[0004] To address the shortcomings of the prior art, the present invention provides a variable-diameter welding fixture. A first clamping portion and a second clamping portion are mounted on an inner shaft and an outer shaft, respectively. The first clamping portion and the second clamping portion are respectively inserted into a first tubular member and a second tubular member. The support heights of the first clamping portion and the second clamping portion are changed by the movement of a first slider and a second slider, thereby enabling the first clamping portion and the second clamping portion to clamp and release the inner walls of the first and second tubular members, thereby achieving accurate positioning and clamping of the tubular member to be welded. The present invention not only has a simple structure and is easy to operate, but also has high assembly efficiency and high positioning accuracy, which can improve the quality of subsequent welding and is applicable to the welding of various tubular members.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A variable diameter welding fixture is used to extend into a tubular member to be welded to position and clamp the tubular member. The welding fixture comprises:

[0007] The inner shaft is an externally threaded rod having a first end and a second end, the first end being provided with a first rotation pair, and the inner shaft being threadedly connected with a first slider;

[0008] The outer shaft is a threaded sleeve provided with an external thread, which is sleeved on the inner shaft and located between the first slider and the second end portion. One end of the outer shaft is connected to the first slider via a second rotation pair, and the second slider is threadedly connected to the outer shaft;

[0009] a first clamping portion comprising a plurality of first clamping members circumferentially mounted on the inner shaft, each first clamping member comprising a first support rod and a second support rod connected via a third rotational pair, the bottoms of the first support rod and the second support rod being hinged to the first rotational pair and a first slider, respectively, so that the support height of the first clamping member is changed by moving the first slider along the inner shaft, thereby achieving clamping and loosening of the top of the first clamping member on the inner wall of the first tubular member; and

[0010] The second clamping portion includes a plurality of second clamping members circumferentially mounted on the outer shaft, each second clamping member includes a third support rod and a fourth support rod connected by a fourth rotating pair, the bottoms of the third support rod and the fourth support rod are respectively hinged on the first slider and the second slider, and the support height of the second clamping member is changed by moving the second slider along the outer shaft, thereby achieving the clamping and loosening of the inner wall of the second tubular member by the top of the second clamping member.

[0011] Furthermore, the first clamping member and the second clamping member have the same structure, the middle parts of the first support rod and the second support rod are cross-connected through a third rotation pair, and the middle parts of the third support rod and the fourth support rod are cross-connected through a fourth rotation pair.

[0012] Furthermore, a first clamping plate is hinged on the top of the first support rod and the second support rod, and a second clamping plate is hinged on the top of the third support rod and the fourth support rod.

[0013] Furthermore, the first clamping plate and the second clamping plate are both plate-like structures with a slide groove provided on at least one end, and the first support rod and / or the second support rod and the third support rod and / or the fourth support rod are respectively hinged in the slide groove.

[0014] Furthermore, the shapes of the first clamping plate and the second clamping plate are respectively adapted to the shapes of the inner walls of the first tubular member and the second tubular member.

[0015] Furthermore, the first rotation pair and the second rotation pair are both thrust bearings.

[0016] Furthermore, a first hinge seat is fixed on the first rotating pair, and the bottom of each first support rod is hinged to the first hinge seat at equal intervals along the circumferential direction.

[0017] Furthermore, a second hinge seat and a third hinge seat are fixed on the first slider and the second slider respectively, and the bottom of each second support rod and the third support rod are hinged on the second hinge seat at equal intervals along the circumferential direction, and the bottom of each fourth support rod is hinged on the third hinge seat at equal intervals along the circumferential direction.

[0018] Furthermore, a first rotary regulating valve is fixed to the second end of the inner shaft, and a second rotary regulating valve is fixed to an end of the outer shaft close to the second end.

[0019] Furthermore, the first clamping portion includes at least two first clamping members installed on the inner shaft at equal intervals along the circumferential direction, and the second clamping portion includes at least two second clamping members installed on the outer shaft at equal intervals along the circumferential direction.

[0020] The beneficial effects of the utility model are:

[0021] 1. The present invention has a simple structure and is easy to operate. By installing the first clamping part and the second clamping part on the inner shaft and the outer shaft respectively, and extending the first clamping part and the second clamping part into the first tubular member and the second tubular member respectively, the first slider moves along the inner shaft to drive the second support rod to move, and the support height of each first clamping part can be changed, thereby achieving the clamping and loosening of the top of the first clamping part on the inner wall of the first tubular member; by moving the second slider along the outer shaft to drive the fourth support rod to move, the support height of the second clamping part can be changed, thereby achieving the clamping and loosening of the top of the second clamping part on the inner wall of the second tubular member, and achieving accurate positioning and clamping of the tubular member to be welded. The welding fixture of the present invention is not only simple in structure and easy to operate, but also has high assembly efficiency and high positioning accuracy, which can improve the subsequent welding quality and is applicable to the welding of various tubular members.

[0022] 2. The first support rod of the present invention is hinged on the first rotating pair, and the first slider is threadedly connected to the surface of the inner shaft. When the inner shaft rotates, the first clamping member does not rotate synchronously with the inner shaft, thereby enabling the first slider to move axially along the inner shaft when the inner shaft rotates, thereby achieving adjustment of the first clamping member. One end of the outer shaft is connected to the first slider via a second rotating pair, and a second slider is threadedly connected to the outer shaft. On the one hand, when the inner shaft rotates, the outer shaft will move axially along the inner shaft synchronously with the first slider. On the other hand, when the outer shaft rotates, the second slider can move axially along the outer shaft, thereby achieving adjustment of the second clamping member. The present invention can achieve axial movement of the first and second sliders by rotating the inner and outer shafts, which is easy to operate and can achieve efficient positioning and clamping of the tubular member to be welded, greatly improving work efficiency.

[0023] 3. By hingedly connecting the first clamping plate to the top of the first support rod and the second support rod, and hingedly connecting the second clamping plate to the top of the third support rod and the fourth support rod, the contact area between the first clamping portion and the second clamping portion and the tubular member to be welded can be increased, making the clamping effect of the welding fixture of the present invention on the tubular member to be welded more stable and safe; by respectively setting the shapes of the first clamping plate and the second clamping plate to match the shapes of the inner walls of the first tubular member and the second tubular member, the clamping effect can be further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1This is a schematic diagram of the overall structure of a variable diameter welding fixture of the present invention;

[0025] Figure 2 The utility model is a schematic diagram of a variable diameter welding fixture in use.

[0026] Reference numerals:

[0027] 10-inner shaft, 11-first end, 12-second end, 13-first slider, 14-first hinged seat, 15-second hinged seat, 16-first rotary regulating valve, 20-outer shaft, 21-second slider, 22-third hinged seat, 23-second rotary regulating valve, 30-first clamping member, 31-first support rod, 32-second support rod, 33-first clamping plate, 34-slide groove, 40-second clamping member, 41-third support rod, 42-fourth support rod, 43-second clamping plate, 50-first tubular member, 60-second tubular member. DETAILED DESCRIPTION

[0028] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0029] In the description of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating positions or location relationships, are based on the positions or location relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0031] like Figure 1 and Figure 2 As shown, the utility model provides a variable diameter welding fixture, which is used to extend into a tubular member to be welded to position and clamp the tubular member. The welding fixture includes:

[0032] The inner shaft 10 is an externally threaded rod having a first end 11 and a second end 12. The first end 11 is mounted with a first rotation pair. The inner shaft 10 is threadedly connected with a first slider 13.

[0033] The outer shaft 20 is a threaded sleeve with an external thread, which is sleeved on the inner shaft 10 and located between the first slider 13 and the second end 12. One end of the outer shaft 20 is connected to the first slider 13 via a second rotational pair. The second slider 21 is threadedly connected to the outer shaft 20.

[0034] The first clamping portion includes a plurality of first clamping members 30 circumferentially mounted on the inner shaft 10. Each first clamping member 30 includes a first support rod 31 and a second support rod 32 connected by a third rotational pair. The bottoms of the first support rod 31 and the second support rod 32 are respectively hinged to the first rotational pair and the first slider 13. The first slider 13 is moved along the inner shaft 10 to change the support height of the first clamping member 30, thereby achieving clamping and loosening of the top of the first clamping member 30 on the inner wall of the first tubular member 50; and

[0035] The second clamping portion includes a plurality of second clamping members 40 circumferentially mounted on the outer shaft 20. Each second clamping member 40 includes a third support rod 41 and a fourth support rod 42 connected by a fourth rotating pair. The bottoms of the third support rod 41 and the fourth support rod 42 are hinged on the first slider 13 and the second slider 21, respectively. The second slider 21 moves along the outer shaft 20 to change the support height of the second clamping member 40, thereby achieving the clamping and loosening of the inner wall of the second tubular member 60 by the top of the second clamping member 40.

[0036] The present invention has a simple structure and is easy to operate. By installing the first clamping part and the second clamping part on the inner shaft 10 and the outer shaft 20, respectively, and extending the first clamping part and the second clamping part into the first tubular member 50 and the second tubular member 60, respectively, the first slider 13 is moved along the inner shaft 10 to drive the second support rod 32 to move, so that the support height of each first clamping part 30 can be changed, thereby achieving the clamping and loosening of the top of the first clamping part 30 on the inner wall of the first tubular member 50; by moving the second slider 21 along the outer shaft 20 to drive the fourth support rod 42 to move, the support height of the second clamping part 40 can be changed, thereby achieving the clamping and loosening of the top of the second clamping part 40 on the inner wall of the second tubular member 60, thereby achieving accurate positioning and clamping of the tubular member to be welded. The welding fixture of the present invention is not only simple in structure and easy to operate, but also has high assembly efficiency and high positioning accuracy, which can improve the subsequent welding quality and is applicable to the welding of various tubular members.

[0037] The first support rod 31 of the present invention is hinged on the first rotating pair, and the first slider 13 is threadedly connected to the surface of the inner shaft 10. When the inner shaft 10 rotates, the first clamping member 30 does not rotate synchronously with the inner shaft 10, so that the first slider 13 can move axially along the inner shaft 10 when the inner shaft 10 rotates, thereby achieving adjustment of the first clamping member 30. One end of the outer shaft 20 is connected to the first slider 13 through the second rotating pair, and a second slider 21 is threadedly connected to the outer shaft 20. On the one hand, when the inner shaft 10 rotates, the outer shaft 20 will move axially along the inner shaft 10 synchronously with the first slider 13. On the other hand, when the outer shaft 20 rotates, the second slider 21 can move axially along the outer shaft 20, thereby achieving adjustment of the second clamping member 40. The present invention can achieve axial movement of the first slider 13 and the second slider 21 by rotating the inner shaft 10 and the outer shaft 20, which is easy to operate and can achieve efficient positioning and clamping of the tubular member to be welded, greatly improving work efficiency.

[0038] In some embodiments, as Figure 1 As shown, the first clamping member 30 and the second clamping member 40 have the same structure, the middle parts of the first support rod 31 and the second support rod 32 are cross-connected by a third rotating pair, and the middle parts of the third support rod 41 and the fourth support rod 42 are cross-connected by a fourth rotating pair. The tops of the first support rod 31 and the second support rod 32 are hinged with a first clamping plate 33, and the tops of the third support rod 41 and the fourth support rod 42 are hinged with a second clamping plate 43. The first clamping plate 33 and the second clamping plate 43 are both plate-like structures with a slide groove 34 on at least one end, and the first support rod 31 and / or the second support rod 32 and the third support rod 41 and / or the fourth support rod 42 are respectively hinged in the slide groove 34. When the first slider 13 and the second slider 21 move axially along the inner shaft 10 and the outer shaft 20, the middle of the first support rod 31 and the second support rod 32 and the third support rod 41 and the fourth support rod 42 will rotate relative to each other around the revolving pair, and the tops will slide in the said slide groove 34 to complete the support height adjustment of the first clamping member 30 and the second clamping member 40, thereby achieving the clamping and loosening of the inner wall of the tubular member to be welded by the top of the first clamping member 30 and the second clamping member 40. By hingedly connecting the first clamping plate 33 to the top of the first support rod 31 and the second support rod 32, and hingedly connecting the second clamping plate 43 to the top of the said third support rod 41 and the fourth support rod 42, the contact area between the first clamping part and the second clamping part and the tubular member to be welded can be increased, making the clamping effect of the welding fixture of the present invention on the tubular member to be welded more stable and safe.

[0039] As a preferred embodiment, through holes are provided in the middle of the first support rod 31 , the second support rod 32 , the third support rod 41 and the fourth support rod 42 , and the third rotation pair and the fourth rotation pair are pins passing through the through holes.

[0040] As a preferred embodiment, the shapes of the first clamping plate 33 and the second clamping plate 43 are respectively adapted to the shapes of the inner walls of the first tubular member 50 and the second tubular member 60 , which can further improve the stability and safety of clamping.

[0041] The first tubular member 50 is sleeved outside the first clamping portion, and the inner shaft 10 is rotated to move the first slider 13 and the outer shaft 20 along the inner shaft 10 toward the first end 11 of the inner shaft 10, thereby driving the second support rod 32 to move toward the first end 11 of the inner shaft 10, so that the support height of each first clamping member 30 becomes higher, until all the first clamping plates 33 completely clamp the inner wall of the first tubular member 50. At this time, the rotation of the inner shaft 10 is stopped to complete the clamping work of the first tubular member 50; then the second tubular member 60 is sleeved It is arranged outside the second clamping portion, so that the end of the second tubular member 60 is close to the end of the first tubular member 50, and the outer shaft 20 is rotated to move the second slider 21 along the outer shaft 20 toward the first end 11 of the inner shaft 10, thereby driving the fourth support rod 42 to move toward the first end 11 of the inner shaft 10, so that the support height of each second clamping member 40 becomes higher, until all the second clamping plates 43 completely clamp the inner wall of the second tubular member 60. At this time, stop rotating the outer shaft 20 to complete the clamping work of the second tubular member 60.

[0042] In some embodiments, as Figure 1 As shown, the first and second rotating pairs are both thrust bearings, so that when the inner shaft 10 and the outer shaft 20 rotate, the first clamping portion and the second clamping portion do not rotate synchronously, thereby achieving axial movement of the first slider 13 and the second slider 21. When the inner shaft 10 rotates, the outer shaft 20 and the second slider 21 will follow the first slider 13 and move axially along the inner shaft 10; when the outer shaft 20 rotates, the second slider 21 will move axially along the outer shaft 20, thereby driving the bottom of the second support rod 32 and the fourth support rod 42 to move, thereby achieving the clamping and loosening of the top of the first clamping member 30 and the second clamping member 40 on the inner wall of the tubular member to be welded.

[0043] In some embodiments, as Figure 1 As shown, a first hinge seat 14 is fixed to the first rotating pair, and the bottom of the first support rod 31 in each first clamping member 30 is hinged to the first hinge seat 14 at equal intervals along the circumferential direction. A second hinge seat 15 and a third hinge seat 22 are fixed to the first slider 13 and the second slider 21, respectively. The bottom of each second support rod 32 and the bottom of each third support rod 41 are hinged to the second hinge seat 15 at equal intervals along the circumferential direction, and the bottom of each fourth support rod 42 is hinged to the third hinge seat 22 at equal intervals along the circumferential direction.

[0044] In some embodiments, as Figure 1As shown, a first rotary regulating valve 16 is fixed to the second end 12 of the inner shaft 10, and a second rotary regulating valve 23 is fixed to the end of the outer shaft 20 near the second end 12. By rotating the first rotary regulating valve 16 and the second rotary regulating valve 23, the inner shaft 10 and the outer shaft 20 can be driven to rotate, making operation simpler and more convenient.

[0045] In some embodiments, the first clamping portion includes at least two first clamping members 30 circumferentially and evenly spaced apart on the inner shaft 10, and the second clamping portion includes at least two second clamping members 40 circumferentially and evenly spaced apart on the outer shaft 20. Preferably, the number of each of the first clamping members 30 and the second clamping members 40 is three, and they are mounted on the outer walls of the inner shaft 10 and the outer shaft 20 in a symmetrical manner along their respective axes.

[0046] The operation steps of the welding fixture of the utility model are as follows:

[0047] (1) Sleeve the first tubular member 50 outside the first clamping portion;

[0048] (2) Rotate the inner shaft 10 so that the first slider 13 and the outer shaft 20 move along the inner shaft 10 toward the first end 11 of the inner shaft 10 until all the first clamping plates 33 completely clamp the inner wall of the first tubular member 50. At this time, stop rotating the inner shaft 10.

[0049] (3) Sleeve the second tubular member 60 outside the second clamping portion so that the end of the second tubular member 60 is in close contact with the end of the first tubular member 50;

[0050] (4) Rotate the outer shaft 20 so that the second slider 21 moves along the outer shaft 20 toward the first end 11 of the inner shaft 10 until all the second clamping plates 43 completely clamp the inner wall of the second tubular member 60. At this time, stop rotating the outer shaft 20, and the positioning and clamping of the first tubular member 50 and the second tubular member 60 are completed.

[0051] (5) Welding the first tubular member 50 and the second tubular member 60;

[0052] (6) Rotate the inner shaft 10 and the outer shaft 20 in opposite directions so that the first clamping plate 33 and the second clamping plate 43 release the first tubular member 50 and the second tubular member 60, and remove the welding fixture.

[0053] The above embodiments are intended only to illustrate the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications, or equivalent substitutions of the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention and should be encompassed by the scope of the claims of the present invention.

Claims

1. A variable diameter welding fixture, used to extend into a tubular part to be welded to position and clamp the tubular part, characterized in that: The welding fixture comprises: The inner shaft is an externally threaded rod having a first end and a second end, the first end being provided with a first rotation pair, and the inner shaft being threadedly connected with a first slider; The outer shaft is a threaded sleeve provided with an external thread, which is sleeved on the inner shaft and located between the first slider and the second end portion. One end of the outer shaft is connected to the first slider via a second rotation pair, and the second slider is threadedly connected to the outer shaft; a first clamping portion comprising a plurality of first clamping members circumferentially mounted on the inner shaft, each first clamping member comprising a first support rod and a second support rod connected via a third rotational pair, the bottoms of the first support rod and the second support rod being hinged to the first rotational pair and a first slider, respectively, so that the support height of the first clamping member is changed by moving the first slider along the inner shaft, thereby achieving clamping and loosening of the top of the first clamping member on the inner wall of the first tubular member; and The second clamping portion includes a plurality of second clamping members circumferentially mounted on the outer shaft, each second clamping member includes a third support rod and a fourth support rod connected by a fourth rotating pair, the bottoms of the third support rod and the fourth support rod are respectively hinged on the first slider and the second slider, and the support height of the second clamping member is changed by moving the second slider along the outer shaft, thereby achieving the clamping and loosening of the inner wall of the second tubular member by the top of the second clamping member.

2. The variable diameter welding fixture according to claim 1, characterized in that: The first clamping member and the second clamping member have the same structure. The middle parts of the first support rod and the second support rod are cross-connected through a third rotation pair. The middle parts of the third support rod and the fourth support rod are cross-connected through a fourth rotation pair.

3. The variable diameter welding fixture according to claim 2, characterized in that: A first clamping plate is hinged on the top of the first support rod and the second support rod, and a second clamping plate is hinged on the top of the third support rod and the fourth support rod.

4. The variable diameter welding fixture according to claim 3, characterized in that: The first clamping plate and the second clamping plate are both plate-like structures with a slide groove provided on at least one end, and the first support rod and / or the second support rod and the third support rod and / or the fourth support rod are respectively hinged in the slide groove.

5. The variable diameter welding fixture according to claim 4, characterized in that: The shapes of the first clamping plate and the second clamping plate are respectively adapted to the shapes of the inner walls of the first tubular member and the second tubular member.

6. The variable diameter welding fixture according to claim 1, characterized in that: The first rotation pair and the second rotation pair are both thrust bearings.

7. The variable diameter welding fixture according to claim 6, characterized in that: A first hinge seat is fixed on the first rotating pair, and the bottom of each first support rod is hinged to the first hinge seat at equal intervals along the circumferential direction.

8. The variable diameter welding fixture according to claim 7, characterized in that: A second hinge seat and a third hinge seat are fixed on the first slider and the second slider respectively. The bottom of each second support rod and the third support rod is hinged on the second hinge seat at equal intervals along the circumferential direction, and the bottom of each fourth support rod is hinged on the third hinge seat at equal intervals along the circumferential direction.

9. The variable diameter welding fixture according to claim 1, characterized in that: A first rotary regulating valve is fixed to the second end of the inner shaft, and a second rotary regulating valve is fixed to an end of the outer shaft close to the second end.

10. The variable diameter welding fixture according to claim 9, characterized in that: The first clamping portion includes at least two first clamping members installed on the inner shaft at equal intervals along the circumferential direction, and the second clamping portion includes at least two second clamping members installed on the outer shaft at equal intervals along the circumferential direction.

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