A metal round tube rolling and bulging mechanism

Abstract

The present invention discloses a metal round tube rolling and bulging mechanism, which comprises a spreading rod, a roller mechanism, a bulging ring, and a bulging rod. The roller mechanism is installed on the bulging ring, and the bulging ring is then connected to the bulging rod. During operation, the spreading rod slowly enters the rotating bulging ring to spread the roller mechanism to achieve the purpose of rolling and bulging. The bulging wheel of the roller mechanism can be optimized and selected according to the shape of the bulging corrugation to meet different corrugation requirements.

Description

Technical Field

[0001] The invention relates to the field of pipe forming, and in particular to a metal round pipe rolling and bulging mechanism. Background Art

[0002] As an elastic element, metal bellows are mainly used to manufacture compensators, flexible connectors, heat exchangers, etc. They are widely used in aerospace, power instruments, petrochemicals, automobiles and ships, etc. At present, thin-walled tube bulging is mainly based on hydraulic bulging, but the corrugated shape of its hydraulic forming has certain limitations, and it is difficult to form a shape with a higher height. In addition, the hydraulic bulging process is relatively complex. There are many factors that affect the quality of hydraulic bulging of bellows. If the conditions are not properly controlled, it will seriously affect the forming quality of the bellows, and may cause the failure of the bellows, such as rupture, buckling, wrinkling defects, etc. Some existing mechanical bulging structures are relatively complex and have low efficiency. Summary of the invention

[0003] Aiming at the problems existing in hydraulic bulging of the middle position of a metal round tube, the present invention provides a rolling bulging mechanism for a metal round tube.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0005] A metal round tube rolling and bulging mechanism, comprising a spreading rod, a plurality of roller mechanisms, a bulging ring, and a bulging rod;

[0006] A plurality of roller mechanisms are evenly mounted on the expansion ring, the expansion rod is connected to one end of the expansion ring, and the other end of the expansion ring has an arc surface inside;

[0007] The expansion rod is provided with an elliptical surface for expansion, and the expansion rod is coaxial with the expansion ring and the expansion rod axis. After the expansion rod moves, it pushes the roller mechanism to move radially along the expansion ring, thereby rolling and expanding the metal tube.

[0008] Furthermore, the roller mechanism includes a rolling ball, a rolling rod, a bearing, a bearing cover, a wheel axle, a shoulder ring, and an expansion wheel. The middle section of the rolling rod is an ellipsoid, with a rolling ball groove at one end and a bearing mounting position at the other end. The rolling ball is installed in the rolling ball groove at the lower end of the rolling rod, and the bearing is installed at the bearing mounting position at the upper end of the rolling rod through the bearing cover. An expansion wheel and a shoulder ring are respectively arranged on both sides of the axle wheel, and the shoulder ring is placed between the expansion wheel and the bearing to prevent the expansion wheel from touching the rolling rod during movement. The axle wheel connects the two expansion wheels and the two shoulder rings to the bearing.

[0009] Furthermore, the expansion ring includes an expansion ring and a sleeve ring, and the expansion end of the expansion ring has a plurality of first elliptical holes, second elliptical holes, and buckle grooves arranged at four vertices of the first elliptical holes evenly distributed on the circumferential surface;

[0010] The collar is fixed in the buckle groove, and the inner surface of the collar is an elliptical surface, which matches the ellipsoid of the rolling rod. The ellipsoid can slide up and down on the inner surface of the collar, and the cooperation of the elliptical shape prevents the rolling rod from rotating;

[0011] The second elliptical hole is used to enhance the structural strength of the expansion ring;

[0012] The inside of the bulging end of the bulging ring is an inner arc surface, which fits the elliptical surface of the expansion rod, making it convenient for the expansion rod to enter the bulging ring.

[0013] Furthermore, the expansion rod is engraved with scale lines to facilitate reading of movement data.

[0014] Furthermore, an annular groove is provided on the elliptical surface of the expansion rod to facilitate stable rolling of the roller mechanism.

[0015] Furthermore, one side of the expansion wheel is an expansion curved surface, and the expansion curved surface is selected according to the required shape of the expansion bellows to meet different expansion requirements.

[0016] Furthermore, a convex point is arranged on the rolling rod for limiting the position, so as to prevent the expansion wheel from contacting with the expansion ring and wearing the expansion curved surface.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. In the metal round tube rolling and bulging mechanism, the bottom end of the rolling rod and the rolling ball are in clearance fit, and the rolling ball can roll in the circular groove, so that when the support rod is fed, the rolling ball can support the rolling rod along its elliptical surface to perform rolling and bulging.

[0019] 2. In the metal round tube rolling and bulging mechanism, the bulging ring and the sleeve ring are snap-fitted to increase the structural strength.

[0020] 3. In the metal round tube rolling and bulging mechanism, the rolling rod and the sleeve ring are matched with an elliptical clearance, and can slide up and down on the inner surface of the sleeve ring. The matching of the elliptical shape can prevent the rolling rod from rotating, ensuring that the bulging wheel does not rotate when working.

[0021] 4. In the metal round tube rolling and bulging mechanism, the expansion rod is an elliptical sphere whose curved surface fits the inside of the bulging ring to achieve the purpose of slowly feeding the ejection rod and the extension rod, and there is a concave ring groove at the end of the expansion rod process, so that the rolling and bulging height can be stabilized at the end of the process.

[0022] 5. In the metal round tube rolling and bulging mechanism, the wheel axle is fixed to the top end of the rolling rod through a bearing. The bearing can reduce the friction of the extended rod during rolling and bulging, which is beneficial to the bulging of the bulging wheel.

[0023] 6. In the metal round tube rolling and bulging mechanism, one side of the bulging wheel is a curved surface, and its shape fits the shape of the required bulging bellows. And the bulging wheel can be switched according to the required bellows shape. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the metal round tube rolling and bulging mechanism of the present invention;

[0025] Figure 2 yes Figure 1 Schematic diagram of specific parts of the middle support rod;

[0026] Figure 3 yes Figure 1 Structural diagram of the middle roller mechanism;

[0027] Figure 4 yes Figure 3 Exploded diagram of the structure of the middle roller mechanism;

[0028] Figure 5 yes Figure 3 Schematic diagram of the specific parts of the middle rolling rod;

[0029] Figure 6 yes Figure 3 Schematic diagram of the specific parts of the middle bearing cover;

[0030] Figure 7 yes Figure 3 Schematic diagram of the specific parts of the middle expansion wheel;

[0031] Figure 8 yes Figure 1 Schematic diagram of the structure of the middle bulging ring;

[0032] Fig. 9 yes Figure 8 Schematic diagram of specific parts of the middle bulging ring;

[0033] Fig.10 yes Figure 8 Schematic diagram of the specific parts of the middle ring;

[0034] Fig.11 yes Figure 1 Schematic diagram of specific parts of the middle expansion rod;

[0035] In the figure 1-11, the expansion rod 1, the elliptical surface 11, the annular groove 12, the roller mechanism 2, the expansion ring 3, the expansion rod 4, the rolling ball 21, the rolling rod 22, the ellipsoid 221, the convex point 222, the rolling ball groove 223, the bearing mounting position 224, the bearing 23, the bearing cover 24, the bearing mounting position 241, the axle 25, the shoulder 251, the shoulder ring 26, the expansion wheel 27, the expansion surface 271, the concave platform 272, the expansion ring 31, the first elliptical hole 311, the buckle groove 312, the inner arc surface 313, the second elliptical hole 314, the rod groove 315, the ring 32, the buckle 321, the inner surface 322 of the ring, and the scale line 41. DETAILED DESCRIPTION

[0036] The present invention will be described in detail below according to the accompanying drawings and preferred embodiments, and the purpose and effect of the present invention will become more clear. The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0037] like Figure 1-11 As shown, the metal round tube rolling and bulging mechanism of the present invention comprises a spreading rod 1, a roller mechanism 2, a bulging ring 3, and a bulging rod 4. The roller mechanism 2 is installed on the bulging ring 3, and the bulging rod 4 is connected to one end of the bulging ring 3. The spreading rod 1 has an elliptical surface 11 for spreading, and a ring groove 12 at the end of its stroke, which can facilitate the stable rolling of the roller mechanism 2; the bulging rod 4 has a scale line 41 for reading the movement data.

[0038] The roller mechanism 2 includes a rolling ball 21, a rolling rod 22, a bearing 23, a bearing cover 24, an axle 25, a shoulder ring 26, and an expansion wheel 27; the rolling ball 21 is installed in the rolling ball groove at the lower end of the rolling rod 22, the bearing 23 is installed on the upper end of the rolling rod 22 through the bearing cover 24, and the axle wheel 25 connects the two expansion wheels 27 and the two shoulder rings 26 to the bearing 23. The rolling ball 21 is loosely fitted in the rolling ball groove 223 of the rolling rod 22 and can slide therein; the middle section of the rolling rod 22 is an ellipsoid 221 and is provided with a convex point 222, one end of which is provided with a rolling ball groove 223 and the other end of which is provided with a bearing mounting position 224. The ellipsoid 221 is loosely fitted with the inner surface 321 of the collar so that the rolling rod 22 can slide up and down in the collar 32. The convex point 222 will be restricted on the buckle 321 of the collar 32 to limit the lowest position of the rolling rod 22. The bearing mounting position 224 is used to install the bearing 23, and its two sides are The bearing cover 24 is also provided with a bearing mounting position 241, which cooperates with the bearing mounting position 224 of the rolling rod 22 to fix the bearing; the wheel shaft 25 has a shoulder 251 for limiting the movement of the bulging wheel 27; the bulging wheel 27 has a bulging curved surface 271 on the outer side, and the curved surface shape is the shape of the required bulging bellows, and there is a concave platform 272 at the center of the outer side, and the concave platform 272 is to make way for the wheel 25, so that it is in the same plane with the bulging wheel 27 to prevent it from interfering with the rolling bulging due to being higher than the bulging curved surface 271;

[0039] The expansion ring 3 includes an expansion ring 31 and a sleeve 32; the sleeve 32 is installed on the expansion ring 31 through a buckle 321; the expansion ring 31 has five evenly distributed first elliptical holes 311 at one end, a buckle groove 312 on the edge of the hole, an inner arc surface 313 inside, a second elliptical hole 314 on the surface to increase strength, and a rod groove 315 at the other end. The elliptical holes 311 and the buckle groove 312 are used to install the sleeve 32, and the inner arc surface 313 fits the shape of the elliptical surface 11 of the expansion rod 1 to facilitate the expansion rod 1 to enter the expansion ring 31, and the rod groove 315 is used to connect the expansion rod 4; the sleeve 32 is provided with a buckle 321, and the inner surface of the sleeve is 322, the sleeve 32 is snapped into the buckle groove 312 through the buckle 321, and is fixed with the expansion ring 31 to enhance the structural strength.

[0040] During installation, first install the roller mechanism 2, press the ball 21 into the ball groove at the lower end of the rolling rod 22, then place the bearing 23 in the bearing mounting position at the upper end of the rolling rod, then fix the bearing cover 24 with screws, then place an expansion wheel 27 on the axle 25, then place a shoulder ring 26, then pass the axle 25 through the bearing 23 and then place a shoulder ring 26 and expansion wheel 27 in turn, and then tighten the nut.

[0041] Next, the expansion ring 3 is installed, and the sleeve rings 32 are installed on the expansion ring 31 through the buckles 321 respectively.

[0042] Next, the expansion rod 4 is installed and connected to one end of the expansion ring 3 by screws.

[0043] Next, the roller mechanism 2 is inserted into the sleeve ring 31 of the expansion ring 3 in sequence to complete the installation.

[0044] The working principle of the metal tube rolling and bulging mechanism of the present invention is described below:

[0045] When in use, first put the expansion ring 3 into the pipe that needs to be expanded and then rotate the expansion ring at a uniform speed, then slowly send the expansion rod 1 into the pipe. As the elliptical surface 11 of the expansion rod touches the ball 21, the roller mechanism 2 will slowly expand, allowing the expansion wheel 27 to contact the pipe for rolling. When the ball 21 enters the annular groove 12 of the expansion rod 1, wait for a few seconds until the rolling and expansion are stable, then withdraw the expansion rod 1 to complete the rolling.

[0046] Those skilled in the art can understand that the above are only preferred examples of the invention and are not intended to limit the invention. Although the invention is described in detail with reference to the above examples, those skilled in the art can still modify the technical solutions recorded in the above examples or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, etc. made within the spirit and principle of the invention shall be included in the protection scope of the invention.

Claims

1. A metal round tube rolling and bulging mechanism, characterized in that: It comprises a spreading rod (1), a plurality of roller mechanisms (2), an expansion ring (3), and an expansion rod (4); A plurality of roller mechanisms (2) are evenly mounted on the expansion ring (3); the expansion rod (4) is connected to one end of the expansion ring (3); the other end of the expansion ring (3) has an arc surface inside; the expansion rod (1) is provided with an elliptical surface (11) for expansion; the expansion rod (1) and the expansion ring (3) and the expansion rod (4) are coaxial; after the expansion rod (1) moves, it pushes the roller mechanism (2) to move along the radial direction of the expansion ring (3), thereby rolling and expanding the metal tube; The roller mechanism (2) comprises a rolling ball (21), a rolling rod (22), a bearing (23), a bearing cover (24), a wheel axle (25), a shoulder ring (26), and an expansion wheel (27). The middle section of the rolling rod (22) is an ellipsoid (221), one end of which is provided with a rolling ball groove (223) and the other end of which is provided with a bearing mounting position (224). The rolling ball (21) is mounted in the rolling ball groove (223) at the lower end of the rolling rod (22). The bearing (23) A bearing mounting position (224) is installed on the upper end of the rolling rod (22) through a bearing cover (24); a bulging wheel (27) and a shoulder ring (26) are respectively provided on both sides of the wheel shaft (25); and the shoulder ring (26) is placed between the bulging wheel (27) and the bearing (23) to prevent the bulging wheel (27) from touching the rolling rod (22) during movement; and the wheel shaft (25) connects the two bulging wheels (27) and the two shoulder rings (26) to the bearing (23); The expansion ring (3) comprises an expansion ring (31) and a sleeve ring (32); the expansion end of the expansion ring (31) has a plurality of first elliptical holes (311), second elliptical holes (314) uniformly distributed on a circumferential surface, and snap grooves (312) arranged at four vertices of the first elliptical holes (311); The collar (32) is fixed in the buckle groove (312), and the inner surface (322) of the collar (32) is an elliptical surface, which matches with the ellipsoid (221) of the rolling rod (22). The ellipsoid (221) can slide up and down on the inner surface (322) of the collar, and the matching of the elliptical shape prevents the rolling rod (22) from rotating. The second elliptical hole (314) is used to enhance the structural strength of the expansion ring (31); The inside of the bulging end of the bulging ring (31) is an inner arc surface (313), which fits the outer shape of the elliptical surface (11) of the expansion rod (1), so that the expansion rod (1) can be easily inserted into the bulging ring (31); One side of the expansion wheel (27) is an expansion curved surface (271), and the expansion curved surface (271) is selected according to the required expansion bellows shape, so as to meet different expansion requirements.

2. The metal round tube rolling and bulging mechanism according to claim 1, characterized in that: The expansion rod (4) is engraved with scale lines to facilitate reading of movement data.

3. The metal round tube rolling and bulging mechanism according to claim 1, characterized in that: An annular groove (12) is provided on the elliptical surface (11) of the spreading rod (1) to facilitate stable rolling of the roller mechanism (2).

4. The metal round tube rolling and bulging mechanism according to claim 1, characterized in that: The rolling rod (22) is provided with a convex point (222) for limiting the position and preventing the expansion wheel (27) and the expansion ring (31) from contacting and wearing the expansion curved surface (271).

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