Steel pipe necking machine

Abstract

The utility model discloses a steel pipe necking machine which comprises a base. The necking machine comprises a base, a lower supporting arm, an upper supporting arm, a telescopic driving source, an upper necking module and a lower necking module, and the middle of the lower supporting arm and the middle of the upper supporting arm are hinged to the base; the telescopic driving source is provided with a fixed end and a movable end, the fixed end is hinged to one end of the lower supporting arm, and the movable end is hinged to one end of the upper supporting arm; the upper necking die block is fixedly mounted at the other end of the upper support arm, and an upper die opening is formed in the working surface of the upper necking die block; the lower necking die block is fixedly mounted at the other end of the lower support arm, and a lower die orifice is formed in the working surface of the lower necking die block; wherein the telescopic driving source is suitable for driving the upper support arm to rotate around a hinge point of the upper support arm, so that the necking upper module of the upper support arm and the necking lower module of the lower support arm are relatively closed. According to the utility model, the necking of the steel pipe can be realized, the processing error caused by non-uniform pressure control is avoided, and the processing precision is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of steel pipe necking machine, belong to steel pipe production technical field. BACKGROUND

[0002] In the steel pipe production process, necking machine is the key equipment in pipe jacking unit production, for tightly combining with core rod before pipe jacking.

[0003] After searching the prior art, it is found that the Chinese patent with publication number CN203124581U discloses a kind of steel pipe necking mechanism, which uses necking ejection oil cylinder and pliers body to cooperate with the oil cylinder to realize steel pipe necking, but in the process of use, it is found that multiple oil cylinders need to work simultaneously, which can cause necking precision to be insufficient due to different control pressures, affecting necking quality. SUMMARY

[0004] The technical problem to be solved by the utility model is to overcome the defects of the prior art, and provide a kind of steel pipe necking machine, which can realize necking, avoid processing error caused by uneven pressure control, and improve processing precision.

[0005] To solve the above technical problems, the technical scheme of the utility model is as follows: a kind of steel pipe necking machine, comprising:

[0006] Base;

[0007] Lower support arm and upper support arm, the middle part of the lower support arm and the upper support arm is hinged to the base;

[0008] Telescopic drive source, the telescopic drive source is provided with fixed end and movable end, the fixed end is hinged with one end of the lower support arm, and the movable end is hinged with one end of the upper support arm;

[0009] Necking upper module, the necking upper module is fixedly installed on the other end of the upper support arm, and the working surface of the necking upper module is provided with upper die mouth;

[0010] Necking lower module, the necking lower module is fixedly installed on the other end of the lower support arm, and the working surface of the necking lower module is provided with lower die mouth;

[0011] Wherein, the telescopic drive source is suitable for driving the upper support arm to rotate around its hinge point, so that the necking upper module of the upper support arm and the necking lower module of the lower support arm are relatively closed to form necking processing position.

[0012] Further, the telescopic drive source is hydraulic oil cylinder, the hydraulic oil cylinder is provided with cylinder body and piston rod, the fixed end is the cylinder body, the cylinder body is hinged on the lower support arm, the movable end is arranged on the piston rod, and the piston rod is hinged with the upper support arm.

[0013] Further, the necking upper module and the necking lower module are both made of 45Mn2 material.

[0014] Further, in the upper branch arm, the distance from the upper die center point of the necking upper module to the upper branch arm and base hinge point is less than the distance from the upper branch arm and the telescopic drive source hinge point to the upper branch arm and base hinge point.

[0015] Further, the necking upper module is in a rectangular structure, the upper surface of the necking upper module is fixed on the upper branch arm, and the lower surface of the necking upper module is provided with a groove, and the groove constitutes the upper die.

[0016] Further, the cross section of the groove of the necking upper module perpendicular to the extension direction of the groove is in a circular arc shape.

[0017] Further, the necking lower module is in a rectangular structure, the lower surface of the necking lower module is fixed on the lower branch arm, and the upper surface of the necking lower module is provided with a groove, and the groove constitutes the lower die.

[0018] Further, the upper branch arm is provided with an abutting table at the lower end surface of the side arm close to the telescopic drive source hinge, and the base is provided with an upward extending limiting column, when the telescopic drive source contraction drives the upper branch arm to rotate around the hinge point to a predetermined position, the abutting table abuts against the limiting column to limit the rotation of the upper branch arm.

[0019] Further, the limiting column is provided with a buffer pad.

[0020] Further, the base is provided with a hinge shaft, and the upper branch arm and the lower branch arm are respectively hinged on the hinge shaft through bearing structure, so that the upper branch arm and the lower branch arm are adapted to independently rotate around the hinge shaft.

[0021] By adopting the above technical scheme, the utility model has the following beneficial effects:

[0022] In the utility model, the fixed end of the telescopic drive source is hinged on the lower branch arm, and the movable end is hinged on the upper branch arm. When the telescopic drive source is elongated, the upper branch arm is pushed to rotate around the hinge point of the base, the necking upper module fixed on the upper branch arm moves downward, and gradually closes with the necking lower module fixed on the lower branch arm, so that the hair pipe placed on the necking lower module is clamped and shrunk, the hair pipe head is adhered to the core rod, and the subsequent pipe deformation and extension process is prepared. The whole process ensures that the necking process is uniformly stressed.

[0023] In addition, on the upper support arm, the distance from the upper die to the upper support arm and the base hinge point is less than the distance from the upper support arm and the telescopic drive source hinge point to the upper support arm and the base hinge point, so that the upper support arm can be more stably closed under the action of the driving force, effectively reducing the stress deformation and improving the necking accuracy. Meanwhile, a limiting column is arranged on the base, which cooperates with the abutting table at the lower end of the upper support arm to provide limiting support when the upper support arm rotates to the predetermined position.

[0024] In summary, the utility model has stable operation, avoids deformation caused by uneven stress, and improves necking quality. At the same time, the equipment maintenance cost is effectively reduced, and the economic benefit is improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 Structure diagram of the steel pipe necking machine of the utility model Figure 1 ;

[0026] Figure 2 Structure diagram of the steel pipe necking machine of the utility model Figure 2 . DETAILED DESCRIPTION

[0027] In order to make the content of the utility model more easily and clearly understood, the utility model will be further described in detail below according to specific embodiments and in combination with the drawings.

[0028] As shown in the drawings, Figures 1-2 A steel pipe necking machine comprises:

[0029] a base 1;

[0030] a lower support arm 2 and an upper support arm 3, the middle parts of the lower support arm 2 and the upper support arm 3 are hinged to the base 1;

[0031] a telescopic drive source 4, the telescopic drive source 4 is provided with a fixed end and a movable end, the fixed end is hinged to one end of the lower support arm 2, and the movable end is hinged to one end of the upper support arm 3;

[0032] a necking upper module 5, the necking upper module 5 is fixedly installed on the other end of the upper support arm 3, and an upper die 6 is arranged on the working surface of the necking upper module 5;

[0033] a necking lower module 7, the necking lower module 7 is fixedly installed on the other end of the lower support arm 2, and a lower die 8 is arranged on the working surface of the necking lower module 7;

[0034] The telescopic drive source 4 is suitable for driving the upper support arm 3 to rotate around the hinge point, so that the necking upper module 5 of the upper support arm 3 and the necking lower module 7 of the lower support arm 2 are relatively closed to form a necking processing position.

[0035] In the embodiment, as Figure 1As shown in the figure, the fixed end of the telescopic drive source 4 is hinged to the lower support arm 2, and the movable end is hinged to the upper support arm 3. When the telescopic drive source 4 is extended, it pushes the upper support arm 3 to rotate around the hinge point of the base 1, so that the necking upper module 5 fixed on the upper support arm 3 moves downward and gradually closes with the necking lower module 7 fixed on the lower support arm 2, thereby clamping and shrinking the pipe placed on the necking lower module 7, and making the pipe head adhere to the mandrel, so as to prepare for the subsequent pipe deformation and extension process. The whole process ensures that the necking process is uniformly stressed.

[0036] Specifically, as shown in the figure, Figure 1 The telescopic drive source 4 is a hydraulic cylinder, which is provided with a cylinder body and a piston rod. The fixed end is the cylinder body, which is hinged to the lower support arm 2. The movable end is arranged on the piston rod, and the piston rod is hinged to the upper support arm 3.

[0037] Specifically, as shown in the figure, Figure 1 In the upper support arm 3, the distance from the center point of the necking upper module 5 to the hinge point of the upper support arm 3 and the base 1 is less than the distance from the hinge point of the upper support arm 3 and the telescopic drive source 4 to the hinge point of the upper support arm 3 and the base 1.

[0038] In this embodiment, as shown in the figure, Figures 1-2 The driving force generated by the telescopic drive source 4 can be amplified through the principle of lever, so that the necking upper module 5 has a larger pressure in the closing process. When the telescopic drive source 4 is extended, its force is transmitted to the necking upper module 5 through the upper support arm 3. Because the distance from the center point of the necking upper module 5 to the hinge point of the upper support arm 3 and the base 1 is short, a larger clamping force is generated at the upper die 6, which ensures that the steel pipe is stably stressed during the necking process.

[0039] Specifically, as shown in the figure, Figure 1 The necking upper module 5 is in a rectangular structure. The upper surface of the necking upper module 5 is fixed on the upper support arm 3, and the lower surface of the necking upper module 5 is provided with a groove, which constitutes the upper die 6.

[0040] Specifically, as shown in the figure, Figure 1 The cross section of the groove of the necking upper module 5 perpendicular to the extension direction of the groove is in a circular arc shape.

[0041] Specifically, as shown in the figure, Figure 1 The necking lower module 7 is in a rectangular structure. The lower surface of the necking lower module 7 is fixed on the lower support arm 2, and the upper surface of the necking lower module 7 is provided with a groove, which constitutes the lower die 8.

[0042] Specifically, as shown in the figure, Figure 1 The cross section of the groove of the necking lower module 7 perpendicular to the extension direction of the groove is in a circular arc shape.

[0043] Specifically, as shown in the figure, Figure 1As shown, the necking upper module 5 and the necking lower module 7 are both made of 45Mn2 material.

[0044] In the embodiment, as shown in Figures 1-2 the necking upper module 5 and the necking lower module 7 are fixedly installed on the upper support arm 3 and the lower support arm 2 respectively, and realize the cooperative clamping and necking of the steel pipe through the respective grooves. The upper surface of the necking lower module 7 is provided with a groove with a circular arc cross section, which constitutes the lower die neck 8 as the working surface for placing and forming the steel pipe. The circular arc cross section of the lower die neck 8 is designed to correspond to the upper die neck 6, and together forms a complete die cavity to ensure that the steel pipe can be uniformly deformed according to the predetermined shape during the necking process. When the upper support arm 3 moves downward under the action of the telescopic drive source 4, the necking upper module 5 and the necking lower module 7 gradually close, and the die cavity formed by the grooves exerts pressure on the steel pipe to promote its diameter reduction and forming.

[0045] Specifically, as shown in Figures 1-2 the upper support arm 3 is provided with an abutting table at the lower end surface of the side arm close to the hinge joint with the telescopic drive source 4, and the base 1 is provided with a limiting column 11 extending upward, when the telescopic drive source 4 drives the upper support arm 3 to rotate around the hinge joint to the predetermined position, the abutting table abuts against the limiting column 11 to limit the rotation of the upper support arm 3.

[0046] Specifically, as shown in Figures 1-2 the limiting column 11 is provided with a buffer pad (not shown in the figure).

[0047] Specifically, as shown in Figure 1 the base 1 is installed with a hinge shaft, and the upper support arm 3 and the lower support arm 2 are respectively hingedly connected to the hinge shaft through bearing structures, so that the upper support arm 3 and the lower support arm 2 are adapted to independently rotate coaxially around the hinge shaft.

[0048] In the embodiment, as shown in Figures 1-2 the design of the upper support arm 3 includes a limiting mechanism to ensure that its movement range is within a certain range. The upper support arm 3 is provided with an abutting table at the lower end surface of the side arm close to the hinge joint with the telescopic drive source 4, and the abutting table is used in cooperation with the limiting column 11 extending upward on the base 1. When the necking process is completed, the telescopic drive source 4 is retracted to drive the upper support arm 3 to rotate reversely around the hinge joint until the abutting table of the upper support arm 3 contacts with the limiting column 11 on the base 1, at which time the rotation of the upper support arm 3 is stopped.

[0049] The base 1 is provided with a hinged shaft as a common rotation center of the upper support arm 3 and the lower support arm 2. The upper support arm 3 and the lower support arm 2 are respectively hinged on the hinged shaft through bearing structures, so that the upper support arm 3 and the lower support arm 2 can independently rotate around the same axis. When the telescopic driving source 4 works, the upper support arm 3 rotates around the hinged shaft, while the lower support arm 2 remains relatively static, so as to realize the relative movement between the upper die module 5 and the lower die module 7. The material of the buffer pad can be rubber. The buffer pad is provided with a groove, and is installed on the limiting column 11 through the groove. When the telescopic driving source 4 is contracted, the abutting table of the upper support arm 3 is in contact with the limiting column 11 through the buffer pad, which reduces the noise and the abrasion of the limiting column 11 during the collision, and prolongs the service life of the telescopic driving source 4.

[0050] The above specific embodiments further specifically describe the technical problems, technical solutions and beneficial effects solved by the utility model. It should be understood that the above description is only for specific embodiments of the utility model and is not used to limit the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A steel pipe necking machine characterized by, It comprises: a base (1); a lower support arm (2) and an upper support arm (3), the middle part of each of the lower support arm (2) and the upper support arm (3) is hinged to the base (1); a telescopic drive source (4) provided with a fixed end and a movable end, the fixed end is hinged to one end of the lower support arm (2), and the movable end is hinged to one end of the upper support arm (3); a necking upper module (5) fixedly installed on the other end of the upper support arm (3), the working surface of the necking upper module (5) is provided with an upper die necking (6); a necking lower module (7) fixedly installed on the other end of the lower support arm (2), the working surface of the necking lower module (7) is provided with a lower die necking (8); wherein the telescopic drive source (4) is adapted to drive the upper support arm (3) to rotate around the hinge point, so that the necking upper module (5) of the upper support arm (3) and the necking lower module (7) of the lower support arm (2) are relatively closed to form a necking processing position.

2. The steel pipe necking machine according to claim 1, wherein the telescopic drive source (4) is a hydraulic cylinder provided with a cylinder body and a piston rod, the fixed end is the cylinder body, the cylinder body is hinged to the lower support arm (2), and the movable end is arranged on the piston rod, and the piston rod is hinged to the upper support arm (3).

3. The steel pipe necking machine according to claim 1, wherein the necking upper module (5) and the necking lower module (7) are both made of 45Mn2 material.

4. The steel pipe necking machine according to claim 1, wherein in the upper support arm (3), the distance from the center point of the upper die necking (6) of the necking upper module (5) to the hinge point of the upper support arm (3) and the base (1) is less than the distance from the hinge point of the upper support arm (3) and the telescopic drive source (4) to the hinge point of the upper support arm (3) and the base (1).

5. The steel pipe necking machine according to claim 1, wherein the necking upper module (5) is in a rectangular structure, the upper surface of the necking upper module (5) is fixed on the upper support arm (3), and the lower surface of the necking upper module (5) is provided with a groove, and the groove constitutes the upper die necking (6).

6. The steel pipe necking machine according to claim 5, wherein the cross section of the groove of the necking upper module (5) perpendicular to the extension direction of the groove is in a circular arc shape.

7. The steel pipe necking machine according to claim 1, wherein the necking lower module (7) is in a rectangular structure, the lower surface of the necking lower module (7) is fixed on the lower support arm (2), and the upper surface of the necking lower module (7) is provided with a groove, and the groove constitutes the lower die necking (8).

8. The steel pipe necking machine according to claim 1, wherein ​ ​ ​ ​ ​ ​ The upper supporting arm (3) is provided with an abutting platform near the lower end surface of the side arm hinged to the telescopic driving source (4), and the base (1) is provided with an upwardly extending limiting column (11), when the telescopic driving source (4) is contracted to drive the upper supporting arm (3) to rotate around the hinge point to a predetermined position, the abutting platform abuts against the limiting column (11) to limit the rotation of the upper supporting arm (3).

9. The steel pipe necking machine according to claim 8, characterized in that, The limiting column (11) is provided with a buffer pad.

10. The steel pipe necking machine according to claim 1, characterized in that, The base (1) is provided with a hinged shaft, and the upper supporting arm (3) and the lower supporting arm (2) are respectively hinged to the hinged shaft through bearing structures, so that the upper supporting arm (3) and the lower supporting arm (2) are adapted to independently rotate coaxially around the hinged shaft.

Images