A floating welding fixture

Abstract

The present invention discloses a floating welding fixture, including an outer shell, an inner shell, and a mandrel. The outer shell and the inner shell are both columnar covers with an opening at the top of the upper end. The inner shell is arranged inside the outer shell, and the mandrel is arranged inside the inner shell. A ball head is arranged on the top of the mandrel. A plurality of concave holes are symmetrically arranged on the horizontal outer side of the center of the ball head. Balls are arranged in the concave holes. The outer edges of the balls abut against the inner side wall of the inner shell. A plurality of centering spring pins connected with the inner shell are symmetrically arranged on the circumference at the lower end of the inner shell. The centering spring pins penetrate the inner shell body and abut against the outer circumference of the mandrel. A welding fixture is concentrically arranged inside the mandrel. The present invention has a novel structure, can make the position of the axis of the welded part and the welded part overlap highly, effectively eliminate the influence of the accumulated errors of parts manufacturing, tooling, and equipment on assembly, and improve the welding efficiency and qualified rate of products.

Description

Technical Field

[0001] The invention relates to the technical field of welding, in particular to a floating welding fixture. Background Art

[0002] With the increase in product types and different special requirements of customers, as well as the increase in output, the same product needs to be supplied by different suppliers, requiring the adaptability of production line assembly to be continuously enhanced; currently, due to certain errors in the manufacturing of supplier parts and tooling equipment, the molten layer of parts welding is relatively thin. When the comprehensive error exceeds a certain limit, scrap is generated. The current production line welding process is difficult to meet the requirements. Summary of the invention

[0003] The object of the present invention is to provide a floating welding fixture to solve the problems raised in the above background technology.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] A floating welding fixture comprises an outer shell, an inner shell and a core shaft, wherein the outer shell and the inner shell are both cylindrical covers with an opening at the top of the upper end, the inner shell is arranged inside the outer shell, a concentric groove is arranged at the lower end of the outer shell, a shaft shoulder located inside the groove is arranged at the lower end of the inner shell, an annular end cover wrapping the shaft shoulder is threadedly connected to the lower end of the outer shell, the upper end surface of the inner shell and the lower end surface of the shaft shoulder are both provided with a plurality of spherical grooves evenly distributed around the axial direction thereof, steel balls are placed in the spherical grooves, the steel balls placed in the spherical grooves on the upper end surface of the inner shell are against the inner top surface of the outer shell, the steel balls placed in the spherical grooves on the lower end surface of the shaft shoulder of the inner shell are against the inner side surface of the annular end cover, and the upper end surface of the inner shell and the lower end surface of the shaft shoulder are at the An annular steel ball limit plate is provided, and the annular steel ball limit plate is provided with limit circular holes corresponding to the steel balls in the spherical grooves. The core shaft is arranged inside the inner shell body, and a ball head is provided on the top of the core shaft. A first spherical washer is provided between the top end of the inner shell body and the top of the ball head. A second spherical washer is provided at the transition connection between the core shaft and the ball head. A positioning screw for locking the second spherical washer is provided on the inner shell body. A plurality of concave holes are symmetrically provided on the horizontal outer side of the center of the ball head. Balls are provided in the concave holes. The outer edges of the balls abut against the inner side walls of the inner shell body. A plurality of centering spring pins threadedly connected thereto are symmetrically provided on the circumference at the lower end of the inner shell body. The centering spring pins pass through the outer circumference of the inner shell body abutting against the core shaft, and a welding fixture is concentrically provided inside the core shaft.

[0006] Furthermore, the centering spring pin includes a base, an end cover, and a spring. The base and the end cover are both provided with an inner cavity. The two ends of the spring are respectively arranged in the inner cavity on the base and the end cover. The base abuts against the outer periphery of the core shaft, and the end cover is threadedly connected to the inner shell.

[0007] Preferably, an interference fit is adopted between the first spherical washer and the inner wall of the inner shell, and the first spherical washer and the second spherical washer both fit the outer curved surface of the ball head.

[0008] Preferably, the welding fixture is used to clamp the welded part.

[0009] The beneficial effects of the present invention are:

[0010] (1) The inner shell can rotate around its axis inside the outer shell under the rolling support of the steel balls;

[0011] (2) The core shaft can swing freely inside the inner shell through the cooperation of the ball head at the top of the core shaft with the first spherical washer, the second spherical washer and the ball;

[0012] (3) The core shaft can be centered through the elastic action of the centering spring pin so that the core shaft is located at the center of the inner shell;

[0013] By combining the above (1), (2) and (3), the welding fixture concentrically arranged inside the core shaft can be formed into a floating fixture. When the welding part and the welded part are clamped by the fixture for welding, the axial position overlap degree of the welding part and the welded part can be high, which can effectively eliminate the influence of the accumulated errors of parts manufacturing, tooling and equipment on assembly, and improve the product welding efficiency and qualified rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0015] Figure 1 It is a structural cross-sectional view of the present invention.

[0016] Figure 2 It is a structural sectional view of the outer shell of the present invention.

[0017] Figure 3 It is a structural sectional view of the inner shell of the present invention.

[0018] Figure 4 It is a structural cross-section of the mandrel of the present invention.

[0019] Figure 5 It is a structural sectional view of the centering spring pin of the present invention.

[0020] Figure 6 It is a structural schematic diagram of the annular steel ball limiting plate of the present invention.

[0021] In the figure: 1, outer shell, 2, inner shell, 3, core shaft, 4, groove, 5, shoulder, 6, annular end cover, 7, spherical groove, 8, steel ball, 9, annular steel ball limit plate, 10, limit circular hole, 11, ball head, 12, first spherical washer, 13, second spherical washer, 14, positioning screw, 15, concave hole, 16, ball, 17, centering spring pin, 1701, base, 1702, end cover, 1703, spring, 18, welding fixture. DETAILED DESCRIPTION

[0022] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] like Figures 1 to 6 As shown, the present invention provides a floating welding fixture, including an outer shell 1, an inner shell 2, and a core shaft 3. The outer shell 1 and the inner shell are both cylindrical covers with an opening at the top of the upper end. The inner shell 2 is arranged inside the outer shell 1. A sink groove 4 is concentrically provided at the lower end of the outer shell 1. A shoulder 5 located inside the sink groove 4 is provided at the lower end of the inner shell 2. An annular end cover 6 wrapping the shoulder 5 is threadedly connected at the lower end of the outer shell 1. The upper end surface of the inner shell 2 and the lower end surface of the shoulder 5 are both provided with a plurality of spherical grooves 7 uniformly distributed around the axial direction thereof. Steel balls 8 are placed in the spherical grooves 7. The steel balls 8 placed in the spherical grooves 7 on the upper end surface of the inner shell 2 are against the inner top surface of the outer shell 1. The steel balls 8 placed in the spherical grooves 7 on the lower end surface of the shoulder 5 of the inner shell 2 are against the inner side surface of the annular end cover 6. The upper end surface of the inner shell 2 and the lower end surface of the shoulder 5 are both provided with an annular steel ball limit A positioning plate 9 is provided on the annular steel ball limiting plate 9 with limiting circular holes 10 corresponding to the steel balls 8 in the spherical grooves 7. The core shaft 3 is arranged inside the inner shell 2. A ball head 11 is provided on the top of the core shaft 3. A first spherical washer 12 is provided between the top of the inner shell 2 and the top of the ball head 11. A second spherical washer 13 is provided at the transition connection between the core shaft 3 and the ball head 11. A positioning screw 14 for locking the second spherical washer 13 is provided on the inner shell 2. A plurality of recessed holes 15 are symmetrically provided on the horizontal outer side of the center of the ball head 11. A ball 16 is provided in the recessed hole 15. The outer edge of the ball 16 abuts against the inner side wall of the inner shell 2. A plurality of centering spring pins 17 threadedly connected thereto are symmetrically provided on the circumference at the lower end of the inner shell 2. The centering spring pin 17 passes through the inner shell 2 body and abuts against the outer circumference of the core shaft 3. A welding fixture 18 is concentrically provided inside the core shaft 3. The welding fixture 18 is used to clamp the welded parts.

[0024] Specifically, the centering spring pin 17 includes a base 1701, an end cover 1702, and a spring 1703. The base 1701 and the end cover 1702 are both provided with an inner cavity. The two ends of the spring 1703 are respectively arranged in the inner cavity on the base 1701 and the end cover 1702. The base 1701 abuts against the outer periphery of the core shaft 3, and the end cover 1702 is threadedly connected to the inner shell 2.

[0025] In this embodiment, an interference fit is adopted between the first spherical washer 12 and the inner wall of the inner shell 2 , and both the first spherical washer 12 and the second spherical washer 13 fit the outer curved surface of the ball head 11 .

[0026] In summary, the technical solution of the present invention, the inner housing 2 can rotate around its axial direction inside the outer housing 1 under the rolling support of the steel ball 8; the core shaft 3 can realize free swing inside the inner housing 2 through the cooperation of the ball head 11 at its top and the first spherical washer 12, the second spherical washer 13 and the ball 16; the core shaft 3 can be centered by the elastic action of the centering spring pin 17, so that the core shaft 3 is at the center of the inner housing 2;

[0027] To sum up, the welding fixture 18 concentrically arranged inside the core shaft 3 can be formed into a floating fixture. When the welding part and the welded part are clamped by the fixture for welding, the axial position overlap degree of the welding part and the welded part can be high, which can effectively eliminate the influence of the accumulated errors of parts manufacturing, tooling, and equipment on assembly, and improve the product welding efficiency and qualified rate.

[0028] The embodiments of the present invention described above do not constitute a limitation on the protection scope of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A floating welding fixture, characterized in that: The invention comprises an outer shell, an inner shell and a core shaft, wherein the outer shell and the inner shell are both cylindrical covers with an opening at the top of the upper ends, the inner shell is arranged inside the outer shell, a concentric groove is arranged at the lower end of the outer shell, a shoulder located inside the groove is arranged at the lower end of the inner shell, an annular end cover wrapped around the shoulder is threadedly connected at the lower end of the outer shell, the upper end surface of the inner shell and the lower end surface of the shoulder are both provided with a plurality of spherical grooves evenly distributed around the axial direction, steel balls are placed in the spherical grooves, the steel balls placed in the spherical grooves on the upper end surface of the inner shell are abutted against the inner top surface of the outer shell, the steel balls placed in the spherical grooves on the lower end surface of the shoulder of the inner shell are abutted against the inner side surface of the annular end cover, annular steel ball limiting plates are provided on the upper end surface of the inner shell and the lower end surface of the shoulder, the annular steel ball limiting plates are provided with limiting circular holes corresponding to the steel balls in the plurality of spherical grooves, the core shaft is arranged inside the inner shell, a ball head is provided on the top of the core shaft, and a plurality of spherical grooves are provided inside the inner shell. A first spherical washer is provided between the top of the part and the top of the ball head, a second spherical washer is provided at the transition connection between the core shaft and the ball head, a positioning screw for locking the second spherical washer is provided on the inner shell body, a plurality of concave holes are symmetrically provided on the horizontal outer side of the center of the ball head, a ball is provided in the concave hole, the outer edge of the ball abuts the inner side wall of the inner shell body, a plurality of centering spring pins threadedly connected thereto are symmetrically provided on the circumference at the lower end of the inner shell body, the centering spring pin passes through the inner shell body and abuts the outer circumference of the core shaft, and a welding fixture is concentrically provided inside the core shaft; the centering spring pin comprises a base, an end cover, and a spring, the base and the end cover are both provided with an inner cavity, the two ends of the spring are respectively arranged in the inner cavities on the base and the end cover, the base abuts the outer circumference of the core shaft, and the end cover is threadedly connected to the inner shell body; an interference fit is adopted between the first spherical washer and the inner wall of the inner shell body, and the first spherical washer and the second spherical washer both fit the outer curved surface of the ball head.

2. The floating welding fixture according to claim 1, characterized in that: The welding fixture is used for clamping welding parts.

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