阅读说明：本技术 小管径自动对中装配系统 (Automatic assembly system of assembling of small pipe diameter ) 是由 唐兴华 刘鹏 顾胜 于津伟 孙斌 潘慧君 甘露 杨安海 于 2021-08-02 设计创作，主要内容包括：本发明公开一种小管径自动对中装配系统,底座上设有轨道,轨道的一端设有固定旋转夹持机构,轨道上设有可移动的移动旋转夹持机构；一组上料承接装置,互相配合使用,分别设置在固定旋转夹持机构侧和移动旋转夹持机构侧；固定旋转夹持机构侧和移动旋转夹持机构侧分别设有一组对应的升降系统,升降系统包括升降回转压紧机构、升降托架和开合抱闸升降机构。使用时,在升降回转压紧机构、升降托架和开合抱闸升降机构的最远距离范围内,上下左右四个方向上形成多点有力约束,有效抑制小径管移动跑偏,消除小径管自身的变形和盘弯对于对中装配造成的不利影响。(The invention discloses a small-caliber automatic assembly system, wherein a base is provided with a track, one end of the track is provided with a fixed rotary clamping mechanism, and the track is provided with a movable rotary clamping mechanism; the feeding bearing devices are matched with each other and are respectively arranged on the fixed rotary clamping mechanism side and the movable rotary clamping mechanism side; the fixed rotary clamping mechanism side and the movable rotary clamping mechanism side are respectively provided with a group of corresponding lifting systems, and each lifting system comprises a lifting rotary pressing mechanism, a lifting bracket and an opening and closing contracting brake lifting mechanism. During the use, in the farthest distance scope of lift gyration hold-down mechanism, lift bracket and the band-type brake elevating system that opens and shuts, form the multiple spot forceful restraint in four directions about from top to bottom, effectively restrain the minor diameter pipe and remove the off tracking, eliminate the deformation of minor diameter pipe self and the curved adverse effect that causes the centering assembly of twining.)

1. The small-caliber automatic centering assembly system comprises a base and is characterized in that a rail is arranged on the base, a fixed rotary clamping mechanism is arranged at one end of the rail, and a movable rotary clamping mechanism is arranged on the rail; the feeding bearing devices are matched with each other and are respectively arranged on the fixed rotary clamping mechanism side and the movable rotary clamping mechanism side; the fixed rotary clamping mechanism side and the movable rotary clamping mechanism side are respectively provided with a group of corresponding lifting systems, and each lifting system comprises a lifting rotary pressing mechanism, a lifting bracket and an opening and closing contracting brake lifting mechanism.

2. The small-caliber automatic pair-assembling system according to claim 1, wherein the fixed rotary clamping mechanism comprises a fixed rotary clamping frame and a rotating device arranged on the fixed rotary clamping frame, the front part of the rotating device is provided with a fixed rotary clamping claw, the rear part of the rotating device is provided with a rotating angle indicating device, and a fixed part driving device is connected below the rotating device; the movable rotary clamping mechanism comprises a movable rotary clamping frame and a clamping device arranged on the movable rotary clamping frame, a movable rotary clamping jaw is arranged at the front part of the clamping device, a movable part driving device is connected below the movable rotary clamping jaw, and the fixed rotary clamping jaw and the movable rotary clamping jaw are arranged correspondingly.

3. The small-caliber automatic centering and assembling system according to claim 1, wherein the lifting and rotating pressing mechanism comprises a supporting base and a rotary table arranged on the supporting base, a lifting and pressing frame is arranged on the rotary table, a telescopic lifting and pressing arm is connected to the upper end of the lifting and pressing frame, the lifting and pressing arm comprises a telescopic portion and an outer extending portion, the outer extending portion is connected with a top wheel assembly, the supporting base is of a hollow structure, and a rotating drive for driving the rotary table is arranged in the supporting base.

4. The small-caliber automatic pair-assembling system is characterized in that the external extension part comprises a straight arm part and a claw part arranged at the end part of the straight arm part, the inner side of the claw part is provided with a top wheel combination, the top wheel combination comprises a lifting pressing vertical top wheel arranged at the inner side part of the claw top and two lifting pressing lateral top wheels symmetrically arranged at the left inner side part and the right inner side part of the claw, and the two lifting pressing lateral top wheels are obliquely arranged face to face and have an inclination angle of 10-25 degrees with the horizontal plane.

5. The small-caliber automatic centering assembly system according to claim 1, wherein the lifting bracket comprises a base and a lifting frame arranged on the base, the lifting frame comprises a lifting rod and a U-shaped support frame, the support frame is provided with a suspended riding wheel, the riding wheel is fixed at two ends of the support frame through a wheel shaft, and the riding wheel is formed by splicing two cone frustums to form a structure with a narrow middle part and wide two ends.

6. The small-caliber automatic centering assembly system according to claim 1, wherein the opening and closing band-type brake lifting mechanism comprises a lifting support and an opening and closing mechanism arranged above the lifting support, the opening and closing mechanism is connected with the lifting support through a lifting platform, a lifting driving device is arranged on one side of the lifting support, a set of symmetrically arranged opening and closing band-type brake bases are arranged above the opening and closing mechanism, and band-type brake top wheels are correspondingly arranged on the opening and closing band-type brake bases.

7. The small-caliber automatic centering assembly system as claimed in claim 6, wherein the opening and closing band-type brake seat is provided with an inclined plane and a vertical plane, the included angle between the inclined plane and the vertical plane is 120-150 degrees, the inclined plane and the vertical plane are respectively provided with a band-type brake top wheel, and the band-type brake top wheels on the two opening and closing band-type brake seats are correspondingly arranged.

Technical Field

The invention mainly relates to the technical field of pipe centering assembly, in particular to an automatic small-pipe-diameter centering assembly system.

Background

In the modern industrial production process, the consumption of various pipes is large, and the centering assembly of the pipes and the flanges and the pipes and the sleeves is an important link in the production process. The phenomena of deformation and bending of the pipe per se commonly occur, and the small-diameter pipe is particularly prominent. During assembly, it is difficult for the centerlines of the pipe and flange, pipe and sleeve to coincide. The traditional method is that workers visually inspect and finish centering work through multiple assembling and repairing. The method has low efficiency, long working time, high labor intensity and no guarantee of assembly quality.

In view of the problems that the centering assembly technology of the small-diameter pipe, the flange and the sleeve is lagged, the working efficiency is low, the working time is long, the labor intensity is high, the assembly quality cannot be guaranteed and the like in the traditional industrial production, the automatic centering assembly system of the small-diameter pipe is very necessary to be provided, and the problems in the prior art are solved.

Disclosure of Invention

Aiming at the problems, the invention provides a small-diameter automatic centering assembly system, which realizes the automatic centering assembly of the small-diameter pipe by arranging a fixed rotary clamping mechanism and a movable rotary clamping mechanism at two ends of a track and arranging corresponding lifting systems, eliminates the influence of the deformation of the small-diameter pipe and improves the working efficiency and the working quality.

The purpose of the invention can be realized by the following technical scheme: the small-caliber automatic centering assembly system comprises a base and is characterized in that a rail is arranged on the base, a fixed rotary clamping mechanism is arranged at one end of the rail, and a movable rotary clamping mechanism is arranged on the rail; the feeding bearing devices are matched with each other and are respectively arranged on the fixed rotary clamping mechanism side and the movable rotary clamping mechanism side; the fixed rotary clamping mechanism side and the movable rotary clamping mechanism side are respectively provided with a group of corresponding lifting systems, and each lifting system comprises a lifting rotary pressing mechanism, a lifting bracket and an opening and closing contracting brake lifting mechanism.

Preferably, the fixed rotary clamping mechanism comprises a fixed rotary clamping frame and a rotating device arranged on the fixed rotary clamping frame, the front part of the rotating device is provided with a fixed rotary clamping jaw, the rear part of the rotating device is provided with a rotating angle indicating device, and a fixed part driving device is connected below the rotating device; the movable rotary clamping mechanism comprises a movable rotary clamping frame and a clamping device arranged on the movable rotary clamping frame, a movable rotary clamping jaw is arranged at the front part of the clamping device, a movable part driving device is connected below the movable rotary clamping jaw, and the fixed rotary clamping jaw and the movable rotary clamping jaw are arranged correspondingly.

Further, lift gyration hold-down mechanism includes the supporting seat and establishes the revolving platform on the supporting seat, is equipped with the lift on the revolving platform and compresses tightly the frame, and the upper end that the frame was compressed tightly in the lift is connected with telescopic lift and compresses tightly the arm, and the lift compresses tightly the arm and includes pars contractilis and outer extension, and outer pars contractilis is connected with the top wheel combination, and the supporting seat is hollow structure, is equipped with the rotary drive of drive revolving platform in the supporting seat.

Furthermore, the outer extension part comprises a straight arm part and claw parts arranged at the end parts of the straight arm part, the inner sides of the claw parts are provided with a top wheel combination, the top wheel combination comprises a lifting pressing vertical top wheel arranged at the inner side part of the claw top and two lifting pressing lateral top wheels symmetrically arranged at the left inner side part and the right inner side part of the claw, the two lifting pressing lateral top wheels are obliquely arranged face to face, and the oblique angle of the two lifting pressing lateral top wheels with the horizontal plane is 10-25 degrees.

Compared with the prior art, the technical scheme of the invention comprises the improvement of a plurality of details besides the improvement of the whole technical scheme, and particularly has the following beneficial effects:

1. according to the improved scheme, a group of corresponding lifting systems is arranged on the fixed rotary clamping mechanism side and the movable rotary clamping mechanism side respectively, each lifting system comprises a lifting rotary pressing mechanism, a lifting bracket and an opening and closing band-type brake lifting mechanism, and when the lifting device is used, multi-point force restraint is formed in the upper, lower, left and right directions within the farthest distance range of the lifting rotary pressing mechanism, the lifting bracket and the opening and closing band-type brake lifting mechanism, so that the moving deviation of the small-diameter pipe is effectively restrained, and the adverse effects of the deformation and the bending of the small-diameter pipe on centering assembly are eliminated;

2. the invention can realize the automatic centering assembly of the small-diameter pipe and the flange or the sleeve, eliminate the adverse effect of the deformation of the small-diameter pipe on the centering assembly and effectively improve the working efficiency;

3. the invention has wide application range, is suitable for small-diameter pipes with various specifications, is suitable for arbitrary combination of flanges or sleeves at two ends, and automatic centering assembly of the small-diameter pipes and the flanges or sleeves at two ends or on one side;

4. the centering assembly system has the advantages of high automation degree, compact structure, high space utilization rate, safe and reliable use and convenient popularization and utilization.

Drawings

Fig. 1 is a schematic structural diagram in an embodiment of the present invention.

Fig. 2 is a schematic structural diagram in an embodiment of the present invention.

Fig. 3 is a schematic structural view of the movable rotary clamping mechanism in the part a of fig. 1.

Fig. 4 is a schematic structural view of the fixed rotary clamping mechanism at the part B in fig. 2.

FIG. 5 is a schematic structural diagram of a fixed rotary clamping mechanism according to an embodiment of the present invention.

Fig. 6 is a schematic structural diagram of the lifting rotary pressing mechanism of the present invention.

Fig. 7 is a schematic structural view of the lifting bracket of the present invention.

Fig. 8 is a schematic structural view of the opening and closing band-type brake lifting mechanism of the present invention.

The labels in the figure are as follows:

the device comprises a base 1, a movable rotary clamping mechanism 2, a fixed rotary clamping mechanism 3, a feeding bearing device 4, a lifting rotary pressing mechanism 5, a lifting bracket 6 and a switching contracting brake lifting mechanism 7;

2-1 moving and rotating the clamping frame, 2-2 clamping devices and 2-3 moving part driving devices;

3-1 fixed rotary clamping frame, 3-2 fixed rotary clamping device, 3-3 rotary device, 3-4 rotary angle indicating device and 3-5 fixed part driving device;

5-1 lifting pressing arm, 5-2 lifting pressing vertical top wheel, 5-3 lifting pressing lateral top wheel, 5-4 lifting pressing frame, 5-5 rotary table, 5-6 support seat and 5-7 rotary drive;

6-1 riding wheel, 6-2 lifting frame and 6-3 lifting frame lifting drive;

7-1 lifting support seat, 7-2 lifting driving device, 7-3 lifting platform, 7-4 opening and closing mechanism, 7-5 opening and closing contracting brake seat and 7-6 contracting brake top wheel.

Detailed Description

The following detailed description of the embodiments of the present invention will be given in conjunction with the accompanying drawings to make it clear to those skilled in the art how to practice the present invention. While the invention has been described in connection with preferred embodiments thereof, these embodiments are merely illustrative, and not restrictive, of the scope of the invention.

As shown in fig. 1, the small-caliber automatic assembly system is a uniform sand blasting machine, which comprises a base, and is different from the prior art in that a track is arranged on the base, a fixed rotary clamping mechanism 3 is arranged at one end of the track, and a movable rotary clamping mechanism 2 is arranged on the track; a group of feeding bearing devices 4 which are used in a matched way and are respectively arranged at the side of the fixed rotary clamping mechanism and the side of the movable rotary clamping mechanism; a group of corresponding lifting systems are respectively arranged on the fixed rotary clamping mechanism side and the movable rotary clamping mechanism side, and each lifting system comprises a lifting rotary pressing mechanism 5, a lifting bracket 6 and an opening and closing band-type brake lifting mechanism 7.

Specifically, the lifting rotary pressing mechanism 5, the lifting bracket 6 and the opening and closing band-type brake lifting mechanism 7 are respectively arranged in groups on one side of the movable rotary clamping mechanism 2 and one side of the fixed rotary clamping mechanism 3, and are located in the areas between the movable rotary clamping mechanism 2 and the feeding bearing device 4 and between the fixed rotary clamping mechanism 3 and the feeding bearing device 4. The lifting rotary pressing mechanism 5, the lifting bracket 6 and the opening and closing brake lifting mechanism 7 are arranged in a staggered way and have a certain distance with each other.

The flange or the sleeve is firstly pre-installed on the clamping device 2-2 and the fixed rotary clamping device 3-2 respectively, and the small-diameter pipe is transferred to the lifting bracket 6 from the feeding bearing device 4. The lifting rotary pressing mechanism 5 presses the small-diameter pipe from top to bottom, the lifting bracket 6 supports the small-diameter pipe from bottom to top, and the opening and closing band-type brake lifting mechanism 7 embraces the small-diameter pipe from two sides of the diameter direction of the small-diameter pipe. In the farthest distance range of the lifting rotary pressing mechanism 5, the lifting bracket 6 and the opening and closing brake lifting mechanism 7, multipoint powerful restraint is formed in four directions, namely the upper direction, the lower direction, the left direction and the right direction, the moving deviation of the small-diameter pipe is effectively restrained, and the adverse effects of the deformation and the bending of the small-diameter pipe on centering assembly are eliminated.

The movable rotary clamping mechanism 2 moves the flange or the sleeve to be firstly assembled with one end of the small-diameter pipe in a centering way, and then continuously moves to be assembled with the flange or the sleeve on the fixed rotary clamping mechanism 3 in a centering way. Therefore, the automatic centering assembly of the small-diameter pipe and the two ends of the flange or the sleeve is completed.

The automatic centering assembly system for the small-diameter pipe has the advantages of high automation degree, high applicability, safety, reliability, compact structure and high space utilization rate, and the working efficiency is effectively improved.

Example 1

The invention is provided with a track, one end of the track is provided with a fixed rotary clamping mechanism, and the track is provided with a movable rotary clamping mechanism; the feeding bearing devices are correspondingly matched with each other in pairs and are respectively arranged on the fixed rotary clamping mechanism side and the movable rotary clamping mechanism side, and the feeding bearing devices arranged on the movable rotary clamping mechanism side can move along the track along with the movable rotary clamping mechanism; the fixed rotary clamping mechanism side and the movable rotary clamping mechanism side are respectively provided with a group of corresponding lifting systems, and each lifting system comprises a lifting rotary pressing mechanism, a lifting bracket and an opening and closing contracting brake lifting mechanism.

The feeding bearing device comprises a feeding support frame, a group of rotatable support arms are arranged on the feeding support frame, one ends of the two support arms are rotatably connected with the feeding support frame through rotating shafts, the other ends of the two support arms are free ends, and the upper side edges of the two support arms are provided with saw-toothed bearing edges, so that better matching and use are facilitated.

Further, the fixed rotary clamping mechanism comprises a fixed rotary clamping frame and a rotating device arranged on the fixed rotary clamping frame, a fixed rotary clamping jaw is arranged at the front part of the rotating device, a rotating angle indicating device is arranged at the rear part of the rotating device, and a fixed part driving device is connected below the rotating device; the movable rotary clamping mechanism comprises a movable rotary clamping frame and a clamping device arranged on the movable rotary clamping frame, a movable rotary clamping jaw is arranged at the front part of the clamping device, a movable part driving device is connected below the movable rotary clamping jaw, and the fixed rotary clamping jaw and the movable rotary clamping jaw are arranged correspondingly. The fixed part driving device comprises a motor and a fixed part driving wheel connected with an output shaft of the motor, the fixed part driving wheel is meshed with the rotating device, and the rotating device comprises a large gear; the structure of the moving part driving device is the same as that of the fixed part driving device, and the detailed structure is not described herein.

Further, lift gyration hold-down mechanism includes the supporting seat and establishes the revolving platform on the supporting seat, is equipped with the lift on the revolving platform and compresses tightly the frame, and the upper end that the frame was compressed tightly in the lift is connected with telescopic lift and compresses tightly the arm, and the lift compresses tightly the arm and includes pars contractilis and outer extension, and outer pars contractilis is connected with the top wheel combination, and the supporting seat is hollow structure, is equipped with the rotary drive of drive revolving platform in the supporting seat.

Particularly, the lifting compression frame comprises an outer frame body and a lifting inner frame body arranged in the outer frame body, the inner frame body comprises three parallel support columns, a support platform is arranged at the top of each support column, one end of each lifting compression arm is fixedly connected with the support platform, the outer extension portion is in a shape of a Chinese character 'men', the outer extension portion comprises a straight arm portion and a claw portion arranged at the end of the straight arm portion, a top wheel combination is arranged on the inner side of the claw portion, the top wheel combination comprises a lifting compression vertical top wheel arranged on the inner side of the claw top and two lifting compression lateral top wheels symmetrically arranged on the left inner side and the right inner side of the claw, the two lifting compression lateral top wheels are obliquely arranged face to face, and the angle of the inclination of the two lifting compression lateral top wheels is 10-25 degrees.

The lifting bracket comprises a base and a lifting frame arranged on the base, the lifting frame comprises a lifting rod and a U-shaped support frame, a suspended riding wheel is arranged on the support frame, the riding wheel is fixed at two ends of the support frame through a wheel shaft, and the riding wheel is formed by splicing two circular truncated cones to form a structure with a narrow middle part and two wide ends.

Furthermore, the opening and closing contracting brake lifting mechanism comprises a lifting support seat and an opening and closing mechanism arranged above the lifting support seat, the opening and closing mechanism is connected with the lifting support seat through a lifting platform, a lifting driving device is arranged on one side of the lifting support seat, a set of opening and closing contracting brake seats symmetrically arranged is arranged above the opening and closing mechanism, and contracting brake top wheels correspondingly arranged are distributed on the opening and closing contracting brake seats. The opening and closing contracting brake seat is provided with an inclined plane and a vertical plane, the included angle between the inclined plane and the vertical plane is 150 degrees, the inclined plane and the vertical plane are respectively provided with a contracting brake top wheel, and the contracting brake top wheels on the two opening and closing contracting brake seats are correspondingly arranged.

Example 2

The small-diameter pipe automatic centering assembly system comprises a base 1, a movable rotary clamping mechanism 2, a fixed rotary clamping mechanism 3, a feeding bearing device 4, a lifting rotary pressing mechanism 5, a lifting bracket 6 and an opening and closing band-type brake lifting mechanism 7, as shown in figures 1 to 8.

The base 1 is arranged and fixed on the ground through bolt connection, and the upper surface of the base 1 is provided with a track matched with the moving rotary clamping mechanism 2 to move. The movable rotary clamping mechanism 2 and the fixed rotary clamping mechanism 3 are arranged on the upper surface of the base 1 and are respectively arranged on two sides of the base 1.

As shown in fig. 1, 2 and 3, the moving rotary clamping mechanism 2 includes a moving rotary clamping frame 2-1, a clamping device 2-2 and a moving part driving device 2-3. The movable rotary clamping frame 2-1 is connected with the base 1 and is positioned on a track on the upper surface of the base 1. The gripping device 2-2 is disposed on an end outer side plate of the moving rotary gripping frame 2-1, and the moving portion driving device 2-3 is disposed in a lower middle portion of the moving rotary gripping frame 2-1.

The gripping device 2-2 is preferably a three-jaw or multi-jaw chuck.

The moving part driving means 2-3 is preferably a combination of a servo motor and a speed reducer.

As shown in fig. 4 and 5, the fixed rotary clamping mechanism 3 includes a fixed rotary clamping frame 3-1, a fixed rotary clamping device 3-2, a rotating device 3-3, a rotation angle indicating device 3-4, and a fixed part driving device 3-5. The fixed rotary clamping frame 3-1 is connected with the upper surface of the base 1. The fixed rotary clamping device 3-2 is arranged on the outer side plate of the end part of the fixed rotary clamping frame 3-1, and is opposite to the clamping device 2-2, and the central lines of the clamping devices coincide with each other. The rotating device 3-3 is arranged right behind the fixed rotating clamping device 3-2 and is fixed on the side plate at the same side of the end part of the fixed rotating clamping frame 3-1. The lower part of the rotating device 3-3 is connected with a fixed part driving device 3-5. A rotating angle indicating device 3-4 is arranged behind the rotating device 3-3, and the rotating angle indicating device 3-4 is connected with the fixed rotating clamping frame 3-1. The fixed part driving device 3-5 drives the fixed rotary clamping device 3-2 to rotate for a certain angle together with the flange or the sleeve, and the rotating angle of the flange or the sleeve can be conveniently checked through the rotating angle indicating device 3-4.

The fixed clamping means 3-2 is preferably a three-jaw or multi-jaw chuck.

Said rotating means 3-3 is preferably an external toothed slew bearing.

The fixed part driving device 3-5 is preferably a combination of a variable frequency motor and a speed reducer.

Two sets of material loading supporting devices 4 are respectively arranged on one side of the movable rotary clamping mechanism 2 and one side of the fixed rotary clamping mechanism 3 and are used for supporting the small-diameter pipes and placing the small-diameter pipes on the upper surface of the lifting bracket 6. The feeding bearing devices 4 are used in pairs from front to back, a support is arranged below the feeding bearing devices 4 and fixedly connected with the base 1, and the front feeding bearing devices 4 and the rear feeding bearing devices 4 are respectively connected with the support hinge shaft and can freely rotate. A plurality of wave arc sections are reserved on the upper surface of the feeding bearing device 4, and the small-diameter pipe falls to the upper surface of the lifting bracket 6 after crossing the arc sections.

The lifting rotary pressing mechanism 5 is respectively arranged at the middle positions of the movable rotary clamping mechanism 2 and the fixed rotary clamping mechanism 3 and respectively fixed on the surfaces of the movable rotary clamping frame 2-1 and the fixed rotary clamping frame 3-1.

As shown in figure 6, the lifting rotary pressing mechanism 5 comprises a lifting pressing arm 5-1, a lifting pressing vertical top wheel 5-2, a lifting pressing lateral top wheel 5-3, a lifting pressing frame 5-4, a rotary table 5-5, a supporting seat 5-6 and a rotary drive 5-7. The supporting seats 5-6 are respectively fixed on the surfaces of the movable rotary clamping frame 2-1 and the fixed rotary clamping frame 3-1. The supporting seat 5-6 is a hollow structure, and the rotary drive 5-7 is arranged in the hollow position. The rotary table 5-5 is located above the supporting seat 5-6, the lifting compaction frame 5-4 is located above the rotary table 5-5, the lifting compaction arm 5-1 is located above the lifting compaction frame 5-4, and the extending end part of the lifting compaction arm 5-1 is provided with a lifting compaction vertical top wheel 5-2 and a lifting compaction lateral top wheel 5-3. The lifting and pressing lateral top wheels 5-3 are used in pairs, are arranged at the extending end parts of the lifting and pressing arms 5-1 and are obliquely arranged face to face.

Before the small-diameter pipe crosses the arc section on the upper surface of the feeding and supporting device 4, the lifting and rotating pressing mechanism 5 rotates and falls to the lowest point to avoid the small-diameter pipe, and at the moment, the lifting pressing arm 5-1 is parallel to the small-diameter pipe. After the small-diameter pipe is placed on the lifting bracket 6 across the lifting pressing arm 5-1, the lifting pressing frame 5-4 of the lifting rotary pressing mechanism 5 ascends, the rotary drive 5-7 drives the lifting pressing arm 5-1, the lifting pressing vertical top wheel 5-2, the lifting pressing lateral top wheel 5-3, the lifting pressing frame 5-4 and the rotary table 5-5 to rotate together for 90 degrees, the lifting pressing frame 5-4 descends, and the lifting pressing vertical top wheel 5-2 and the lifting pressing lateral top wheel 5-3 press the small-diameter pipe from top to bottom.

In the process that the small-diameter pipe moves from the movable rotary clamping mechanism 2 to the fixed rotary clamping mechanism 3, the ball heads of the lifting pressing vertical top wheels 5-2 and the lifting pressing lateral top wheels 5-3, which are in contact with the small-diameter pipe, can rotate around the center line of the ball heads and are in rolling friction with the small-diameter pipe.

The lifting and pressing frame 5-4 is preferably a guide rod cylinder.

The rotary table 5-5 is preferably an external toothed rotary bearing.

The slewing drive 5-7 is preferably a combination of a variable frequency motor and a speed reducer.

The lifting bracket 6 is respectively arranged at the middle position of the movable rotary clamping mechanism 2 and the fixed rotary clamping mechanism 3 and respectively fixed on the surfaces of the movable rotary clamping frame 2-1 and the fixed rotary clamping frame 3-1.

As shown in fig. 7, the lifting bracket 6 comprises a riding wheel 6-1, a lifting frame 6-2 and a lifting frame lifting drive 6-3. The lifting frame 6-2 is respectively fixed on the surfaces of the movable rotary clamping frame 2-1 and the fixed rotary clamping frame 3-1. The riding wheel 6-1 is arranged above the lifting frame 6-2 and is connected through a bearing. The lifting frame 6-3 is located on the upper surface of the lifting frame 6-2. The riding wheel 6-1 is a V-shaped structure with two high ends and a low middle.

The lifting frame lifting drive 6-3 is preferably a combination of a servo motor and a worm gear reducer.

The opening and closing band-type brake lifting mechanism 7 is respectively arranged at the middle positions of the movable rotary clamping mechanism 2 and the fixed rotary clamping mechanism 3 and respectively fixed on the surfaces of the movable rotary clamping frame 2-1 and the fixed rotary clamping frame 3-1.

As shown in figure 8, the opening and closing brake lifting mechanism 7 comprises a lifting support base 7-1, a lifting drive 7-2, a lifting platform 7-3, an opening and closing mechanism 7-4, an opening and closing brake base 7-5 and a brake top wheel 7-6. The lifting support seat 7-1 is respectively fixed on the surfaces of the movable rotary clamping frame 2-1 and the fixed rotary clamping frame 3-1. The lifting drive 7-2 and the lifting platform 7-3 are positioned on the lifting support base 7-1. The opening and closing mechanism 4 is arranged above the lifting platform 7-3. The opening and closing contracting brake seat 7-5 is located above the opening and closing mechanism 7-4, is used symmetrically, is mutually independent and can move away from and close to respectively. The band-type brake top wheels 7-6 are arranged on the opening band-type brake base 5, the top wheels are arranged in pairs from top to bottom and face to face, and a certain included angle is reserved between the central lines of the top wheels and the central lines of the bottom wheels.

Before the small-diameter pipe is placed on the lifting bracket 6, the opening and closing band-type brake seat 7-5 and the band-type brake top wheel 7-6 on the two sides of the opening and closing mechanism 7-4 are far away from each other, and the lifting drive 7-2 drives the lifting platform 7-3, the opening and closing mechanism 7-4, the opening and closing band-type brake seat 7-5 and the band-type brake top wheel 7-6 to descend simultaneously. After the small-diameter pipe is placed on the lifting bracket 6, the lifting drive 7-2 drives the lifting platform 7-3, the opening and closing mechanism 7-4, the opening and closing band-type brake seat 7-5 and the band-type brake top wheel 7-6 to ascend simultaneously, the opening and closing band-type brake seat 7-5 and the band-type brake top wheel 7-6 on two sides of the opening and closing mechanism 7-4 are close to each other, and the small-diameter pipe is embraced on two sides of the small-diameter pipe in the diameter direction.

In the process that the small-diameter pipe moves from the movable rotary clamping mechanism 2 to the fixed rotary clamping mechanism 3, the ball heads of the pair of contracting brake top wheels 7-6, which are contacted with the small-diameter pipe, can rotate around the central line of the ball heads and have rolling friction with the small-diameter pipe.

The lifting drive 7-2 and the lifting platform 7-3 are preferably combined by a servo motor and a worm gear reducer.

The lifting rotary pressing mechanism 5, the lifting bracket 6 and the opening and closing band-type brake lifting mechanism 7 are respectively arranged on one side of the movable rotary clamping mechanism 2 and one side of the fixed rotary clamping mechanism 3 in groups and are positioned in the areas between the movable rotary clamping mechanism 2 and the feeding bearing device 4 and between the fixed rotary clamping mechanism 3 and the feeding bearing device 4. The lifting rotary pressing mechanism 5, the lifting bracket 6 and the opening and closing brake lifting mechanism 7 are arranged in a staggered way and have a certain distance with each other.

The automatic centering assembly system for the small-diameter pipe comprises the following working procedures: the flange or the sleeve is firstly pre-installed on the movable rotary clamping device 2-2 and the fixed rotary clamping device 3-2 respectively, and the small-diameter pipe is transferred to the lifting bracket 6 from the feeding bearing device 4. The lifting rotary pressing mechanism 5 presses the small-diameter pipe from top to bottom, the lifting bracket 6 supports the small-diameter pipe from bottom to top, and the opening and closing band-type brake lifting mechanism 7 embraces the small-diameter pipe from two sides of the diameter direction of the small-diameter pipe. In the farthest distance range of the lifting rotary pressing mechanism 5, the lifting bracket 6 and the opening and closing brake lifting mechanism 7, multipoint powerful restraint is formed in four directions, namely the upper direction, the lower direction, the left direction and the right direction, the moving deviation of the small-diameter pipe is effectively restrained, and the adverse effects of the deformation and the bending of the small-diameter pipe on centering assembly are eliminated.

The movable rotary clamping mechanism 2 moves the flange or the sleeve to be firstly assembled with one end of the small-diameter pipe in a centering way, and then continuously moves to be assembled with the flange or the sleeve on the fixed rotary clamping mechanism 3 in a centering way. Therefore, the automatic centering assembly of the small-diameter pipe and the two ends of the flange or the sleeve is completed.

The automatic centering assembly system for the small-diameter pipe is suitable for the arbitrary combination of flanges or sleeves at two ends, and the automatic centering assembly of the small-diameter pipe and the flanges or sleeves at two ends or on one side.

The invention has the following advantages:

1. the invention realizes the automatic centering assembly of the small-diameter pipe and the flange or the sleeve, eliminates the adverse effect of the deformation of the small-diameter pipe on the centering assembly, and effectively improves the working efficiency.

2. The invention has wide application range, is suitable for small-diameter pipes with different specifications, is suitable for arbitrary combination of flanges or sleeves at two ends, and is suitable for automatic centering assembly of the small-diameter pipe and the flanges or sleeves at two ends or on one side.

3. The invention has the advantages of high automation degree, compact structure, safety and reliability.

It should be noted that many variations and modifications of the embodiments of the present invention fully described are possible and are not to be considered as limited to the specific examples of the above embodiments. The above examples are given by way of illustration of the invention and are not intended to limit the invention. In conclusion, the scope of the present invention shall include those alterations or substitutions and modifications which are obvious to those of ordinary skill in the art, and shall be subject to the appended claims.