A whole mouth mechanism of an automatic forming machine for thin-walled short U-bend pipes with welding rings

Abstract

The present invention relates to an automated equipment. The purpose is to provide a mouth-straightening mechanism of an automatic forming machine for thin-walled short U-bend pipes with a welding ring, which can effectively trim the deformation of the pipe mouth of a fixed-length pipe caused by cutting with a tool, and has the characteristics of good quality, high work efficiency and high degree of automation. The technical solution is: a mouth-straightening mechanism of an automatic forming machine for thin-walled short U-bend pipes with a welding ring, characterized in that: the mouth-straightening mechanism includes: a clamping assembly that holds the fixed-length pipe and is driven by a motion assembly, a pressing assembly that applies a clamping force to the clamping assembly, and a shaping assembly that is fixed on a frame in opposite directions and is respectively aligned with the two ends of the fixed-length pipe to perform pipe mouth shaping operations.

Description

Technical Field

[0001] The invention relates to an automated device, in particular to an automatic forming machine for a thin-walled short U-bend pipe with a welding ring. Background Art

[0002] A Chinese patent (patent number 201621011226.2) discloses an automatic forming machine for thin-walled short U-bend tubes with welding rings. The machine first cuts the tube (copper tube) into fixed-length tubes through a tube cutting assembly, and then bends the middle section of the fixed-length tube around a semicircular die into an arc section through a tube bending assembly to form a thin-walled short U-bend tube ( Fig. 9 As shown in the figure, finally, the orderly arranged welding rings are pushed to the straight pipe section of the thin-walled short U-bend pipe through the sleeve welding ring assembly; in the pipe cutting assembly, in order to ensure that the inner diameter of the pipe does not deform when cutting the fixed-length pipe, a full-mouth core rod suitable for the inner diameter of the pipe must be inserted into the pipe first, and a knife avoidance section formed by a circle of grooves is made on the full-mouth core rod to facilitate the cutting of the tool. However, in the actual operation process, the knife avoidance section of the full-mouth core rod is not easy to align with the cutting tool, which causes damage to the tool and affects production. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the above-mentioned background technology and provide a mouth straightening mechanism for an automatic thin-walled short U-bend pipe forming machine with a welding ring, which can effectively straighten the pipe mouth deformation of the fixed-length pipe caused by tool cutting, and has the characteristics of good quality, high work efficiency and high degree of automation.

[0004] The technical solution adopted by the present invention is:

[0005] A mouth shaping mechanism of an automatic forming machine for thin-walled short U-bend pipes with welding rings, characterized in that the mouth shaping mechanism comprises: a clamping assembly for holding a fixed-length pipe and driven by a motion assembly, a pressing assembly for applying a clamping force to the clamping assembly, and a shaping assembly fixed on a frame facing each other and respectively aligned with the pipe ends of the fixed-length pipe to shape the pipe ends;

[0006] The motion assembly includes a swing arm whose bottom end is hinged to the frame, and a swing cylinder fixed to the frame and whose push rod applies force to the swing arm so that the top end of the swing arm cyclically swings between the pipe conveying station and the shaping station;

[0007] The clamping assembly is a copper tube spring clamp fixed on the top of the swing arm; the copper tube spring clamp is composed of a clamping piece whose length is suitable for the fixed-length pipe and a pressure block; the cross-sectional shape of the clamping piece is two semicircular arc surfaces connected at the bottom, and the two semicircular arc surfaces enclose an embracing hole whose inner diameter is suitable for the outer diameter of the fixed-length pipe; the pressure block is composed of two inclined blocks respectively connected to the top of the two semicircular arc surfaces and spaced apart from each other;

[0008] The pressing assembly comprises a clamping cylinder fixed on the top of the swing arm and a pressing block driven by a push rod of the clamping cylinder. The pressing block is provided with a trapezoidal groove that acts simultaneously with the two inclined blocks.

[0009] The shaping component comprises a shaping cylinder and a shaping rod driven by a shaping cylinder push rod and coaxial with the fixed-length pipe material embraced in the copper tube spring clip.

[0010] The wall of the clamping piece is provided with at least two through holes; a steel ball protruding from the inner wall of the engaging hole is positioned at the through hole, and a spring terminal for applying force to the steel ball is also provided; so as to limit the axial movement of the fixed-length pipe in the engaging hole when the swing arm moves.

[0011] The working principle of the present invention is as follows: after the fixed-length pipe is pushed into the copper tube spring clamp by the conveying mechanism, the swing cylinder drives the swing arm to swing, and the copper tube spring clamp on the swing arm clamps and carries the fixed-length pipe to swing to the shaping station; the shaping mechanism is then started, and the two shaping cylinder push rods drive the shaping rods to move toward each other, respectively insert into the pipe mouth of the fixed-length pipe, and shape and correct the pipe mouth; finally, the swing cylinder moves in the opposite direction, driving the swing arm to return to the original position, and the conveying mechanism pushes the next fixed-length pipe to be shaped into the copper tube spring clamp, thereby pushing the shaped fixed-length pipe out of the copper tube spring clamp;

[0012] The above work is carried out in a cycle; the pipe mouth shaping operation of the fixed-length pipe is carried out continuously.

[0013] The beneficial effects of the present invention are:

[0014] By adopting the present invention, the original pipe cutting assembly does not need to use a full-mouth core rod for pipe cutting, and the deformation of the pipe mouth caused by cutting can be completely corrected, which not only avoids the occurrence of tool breakage and damage that often occurs in the original method, but also ensures the normal production; and during shaping, the fixed-length pipe is completely clamped by the copper pipe spring clamp, thereby ensuring that the shape of the fixed-length pipe after shaping remains unchanged, and the shrinkage phenomenon caused by pipe cutting is also completely eliminated, and the pipe mouth size is consistent with the inner and outer diameters of the fixed-length pipe; the purpose of high quality and high efficiency is achieved, and the degree of automation is also high. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional structural schematic diagram of the present invention.

[0016] Figure 2 It is a main structural schematic diagram of the present invention.

[0017] Figure 3 yes Figure 2 Schematic diagram of the cross-sectional structure.

[0018] Figure 4 It is a left-side structural schematic diagram of the present invention.

[0019] Figure 5 yes Figure 2 Schematic diagram of the matching relationship between the top pressure component and the copper tube spring clip.

[0020] Figure 6 yes Figure 5 Schematic diagram of the left viewing direction structure.

[0021] Figure 7 It is a schematic diagram of the cross-sectional structure of the copper tube spring clip.

[0022] Figure 8 It is a three-dimensional structural schematic diagram of the copper tube spring clip.

[0023] Fig. 9 It is a schematic diagram of the thin-wall short U-bend structure described in the present invention. DETAILED DESCRIPTION

[0024] The following is a further description with reference to the embodiments shown in the accompanying drawings.

[0025] The whole mouth mechanism of the automatic forming machine for thin-walled short U-bend pipes with welding rings shown in the attached drawings includes a moving component, a clamping component, a pressing component and a shaping component.

[0026] In the motion assembly, the top of the swing arm 8 is fixed with a copper tube spring clip 6; the bottom of the swing arm is hinged to the frame 1 (through the swing arm hinge shaft 8-1), the swing cylinder 9 is fixed to the frame, and the push rod 10 of the swing cylinder (through the push rod hinge shaft 10-1) is hinged to the swing arm and applies force to the swing arm, so that the top of the swing arm swings back and forth between the pipe conveying pipeline and the whole end of the fixed-length pipe. Figure 4 It can be seen that: when the swing arm swings to the extreme position on the right (indicated by the dotted line in the figure), the copper tube spring clamp is in the pipe conveying station, and the pipe conveying hole in the copper tube spring clamp is just connected to the pipe channel on the frame (the fixed-length pipe 7 can enter the copper tube spring clamp from the channel of the frame, and the fixed-length pipe in the copper tube spring clamp can also be output and enter the channel of the frame to continue moving forward); when the swing arm swings to the extreme position on the left, the copper tube spring clamp is in the shaping station, and the relevant components installed in the shaping station can shape the two end pipe openings of the fixed-length pipe carried by the copper tube spring clamp.

[0027] The clamping assembly is a copper tube spring clamp 6 fixed to the top of the swing arm; the copper tube spring clamp is composed of a clamping piece 6-2 and a pressure block 6-1 whose length is suitable for the fixed-length pipe; the cross-sectional shape of the clamping piece is two semicircular arc surfaces connected at the bottom (see Figure 4 ), two semicircular arc surfaces form a hugging hole ( Figure 2 , Figure 3The engagement hole penetrates the swing arm in the left-right direction), and the inner diameter of the engagement hole is consistent with the outer diameter of the fixed-length pipe; the pressure block is composed of two inclined blocks respectively connected to the top of two semicircular arc surfaces and spaced apart from each other, and the force-bearing surface of the inclined block is the inclined surface 6-11 ( Figure 8 shown).

[0028] In the pressing assembly, the clamping cylinder 5 is fixed on the frame and suspended above the shaping station; the push rod 5-1 of the clamping cylinder is tilted toward the lower right, aligned with the pressing block 12 entering the shaping station and located at the top of the swing arm; the bottom of the pressing block is provided with a trapezoidal groove (a trapezoidal groove that is narrow on the top and wide on the bottom) that acts simultaneously with the force-bearing surfaces of the two inclined blocks; the left and right sides of the outside of the pressing block are made into a stepped shape that is small on the top and large on the bottom, and the two sides of the top of the swing arm are respectively made into folded edges 8-2 that are extended upward (the space formed by the upward extension of the two sides is used to install the copper tube spring) and then bent toward the center, and the folded edges on both sides just grab the stepped part of the pressing block.

[0029] The shaping assembly includes a shaping cylinder 3 and a shaping rod 2 driven by a shaping cylinder push rod; the shaping rod is coaxially arranged with a fixed-length pipe held in a copper tube spring clamp at a shaping station, and the shape of the working section of the shaping rod is determined according to design requirements.

[0030] Furthermore, in order to limit the axial movement of the fixed-length pipe in the embracing hole, the clamping piece is also provided with an elastic structure acting on the fixed-length pipe; the elastic structure (see Figure 6 ) includes at least two through holes 7-1 opened in the wall of the clamping piece, and a steel ball 13 with a partial spherical surface protruding from the inner wall of the engaging hole is provided at the through hole. A spring 14 is positioned in the screw hole of the swing arm and applies force to the steel ball, and a screw 15 is fixed on the screw hole and applies force to the spring (the spring 14 and the screw 15 constitute a spring terminal).

Claims

1. A whole-mouth mechanism of an automatic forming machine for thin-walled short U-bend pipes with welding rings, characterized in that: The shaping mechanism comprises: a clamping assembly for holding a fixed-length pipe (7) and driven by a motion assembly, a pressing assembly for applying a clamping force to the clamping assembly, and a shaping assembly fixed on a frame (1) facing each other and respectively aligned with the pipe ends of the fixed-length pipe to perform pipe shaping operations; The motion assembly comprises a swing arm (8) whose bottom end is hinged to the frame, and a swing cylinder (9) fixed to the frame and whose push rod applies force to the swing arm so that the top end of the swing arm cyclically swings between the pipe conveying station and the shaping station; The clamping assembly is a copper tube spring clamp (6) fixed at the top of the swing arm; the copper tube spring clamp is composed of a clamping piece (6-2) whose length is suitable for the fixed-length pipe and a pressure block (6-1); the cross-sectional shape of the clamping piece is two semi-circular arc surfaces connected at the bottom, and the two semi-circular arc surfaces enclose an embracing hole whose inner diameter is suitable for the outer diameter of the fixed-length pipe; the pressure block is composed of two inclined blocks respectively connected to the top of the two semi-circular arc surfaces and spaced apart from each other; In the push-pressing assembly, a clamping cylinder (5) is fixed on a frame and suspended above the shaping station; a push rod (5-1) of the clamping cylinder is tilted toward the lower right, aligned with a push-pressing block (12) that enters the shaping station and is located at the top of the swing arm; a trapezoidal groove is provided at the bottom of the push-pressing block, which acts simultaneously with the force-bearing surfaces of the two inclined blocks; The shaping assembly comprises a shaping cylinder (3) and a shaping rod (2) driven by a shaping cylinder push rod and coaxial with the fixed-length pipe material held in the copper tube spring clamp; The wall of the clamping piece is provided with at least two through holes (7-1), at which steel balls (13) protruding from the inner wall of the engaging hole are positioned, and a spring terminal for applying force to the steel balls is provided to limit the axial movement of the fixed-length pipe in the engaging hole when the swing arm moves.

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