CN106624549B - Thin-walled cylindrical member rotary vertical assembles device - Google Patents

Abstract

A rotary vertical assembly device for thin-walled cylindrical components, including: a frame, a vertical lifting platform for lifting cylindrical components, a friction stir welding mechanism, an annular upper external pressure clamp and an annular lower external pressure clamp, wherein: the vertical lifting The platform, the upper external pressure fixture and the lower external pressure fixture are slidingly arranged in the frame vertically in sequence. The upper external pressure fixture and the lower external pressure fixture clamp and rotate the cylindrical member. The friction stir welding mechanism is fixed on one side of the frame. The invention adopts the vertical clamping and welding method, which avoids the structural deformation of the thin-walled cylindrical member due to its own gravity, reduces the error influencing factors in the assembly process, and adopts circumferential uniform fixtures to realize flexible clamping of the thin-walled cylinder , to ensure positioning accuracy, reduce clamping positioning errors, high degree of equipment automation, centralized workstations, small footprint, highly controllable loading, clamping, welding, and blanking processes, which improves assembly efficiency.

Description

Rotary Vertical Assembly Device for Thin-walled Cylindrical Components

technical field

The invention relates to a technology in the field of automatic assembly, in particular to a rotary vertical assembly device for a thin-walled cylindrical member.

Background technique

The high-precision assembly of large cylindrical thin-walled components is a key technology in aerospace and other fields. Aerospace thin-walled cylindrical components such as rocket storage tanks are tailor-welded with aluminum alloy thin-walled components in the form of grids in order to reduce their own weight. The assembly of large cylindrical thin-walled components mainly adopts horizontal assembly. The internal support fixture overcomes the deformation of the cylinder due to its own weight. It will increase, the cylinder structure is more seriously deformed by its own weight, and the horizontal assembly is more difficult to control the deformation of the cylinder. At the same time, the force in each direction is uneven, resulting in a decrease in positioning accuracy.

Contents of the invention

The present invention can only be applied to the assembly and welding of one section of the cylinder body and the head in view of the prior art, and cannot realize the assembly between multiple cylinder sections, or the flexibility of the tooling is insufficient, and the active shape comparison and local positioning cannot be performed, and the assembly accuracy of the workpiece is very low. It largely relies on the manufacturing and installation positioning accuracy of the arc brace, lacks clamping devices, and is difficult to apply to the friction stir welding welding process that has strict requirements on fixtures and fixtures. A kind of rotary vertical assembly of thin-walled cylindrical components is proposed device.

The present invention is achieved through the following technical solutions:

The invention includes: a frame, a vertical lifting platform for lifting a cylindrical member, a friction stir welding mechanism, an annular upper external pressure fixture and an annular lower external pressure fixture, wherein: a vertical lifting platform, an upper external pressure fixture and a lower external pressure fixture Slidingly arranged in the frame vertically in sequence, the upper external pressure fixture and the lower external pressure fixture clamp and rotate the cylindrical member, and the friction stir welding mechanism is fixed on one side of the frame.

The frame includes four circularly distributed uprights, and the uprights are provided with vertically arranged linear guide rails and linear racks.

The upper external pressure fixture includes: an annular upper fixture mounting seat and a circular upper fixture base, wherein: the upper fixture mounting seat is slidably connected with the column, and the upper fixture base is connected to the upper fixture mounting seat through an upper fixture rotary bearing with external teeth The lower part is connected, and several clamping mechanisms are evenly distributed in the circumferential direction of the upper fixture base.

The upper fixture mounting seat is provided with an upper fixture circumferential driving motor, which engages with the outer teeth of the upper fixture slewing bearing through gears to drive the upper fixture base to rotate.

The lower external pressure fixture includes: an annular lower fixture mounting seat and an annular lower fixture base, wherein: the lower fixture mounting seat is slidably connected to the column, and the lower fixture base is connected to the lower fixture mounting seat through a lower fixture slewing bearing with external teeth The upper part is connected axially, and several clamping mechanisms are evenly distributed around the base of the lower fixture.

On the mounting seat of the lower fixture, a plurality of positioning fixtures are evenly distributed in the circumferential direction in the center ring of the base of the lower fixture.

The barrel section positioning fixture includes: two positioning platens and a positioning cylinder, wherein: a rectangular groove is provided in the middle of the positioning cylinder, and the two positioning platens are arranged in the groove and connected with the cylinder to clamp the cylindrical member.

The mounting seat of the lower fixture is provided with a circumferential driving motor of the lower fixture, and the circumferential driving motor of the lower fixture engages with the external teeth of the slewing bearing of the lower fixture through gears to drive the base of the lower fixture to rotate.

The clamping mechanism includes: an arc-shaped clamping plate, a clamping guide rail and a lead screw, wherein: the clamping guide rail is arranged on the clamp base, and the clamping plate is slidably arranged on the clamping guide rail and connected with the lead screw.

The vertical lifting platform includes: an annular platform base and a workpiece connection platform for fixing the cylindrical member, wherein: the platform base is slidably connected to the column, and the workpiece connection platform is rotatably connected to the platform base.

technical effect

Compared with the prior art, the present invention adopts the vertical clamping and welding method, which avoids the structural deformation of the thin-walled cylindrical member due to its own gravity, reduces the error influencing factors in the assembly process, and adopts circumferentially evenly distributed clamps to realize the The flexible clamping of the thin-walled cylinder ensures positioning accuracy and reduces clamping positioning errors. The equipment has a high degree of automation, centralized workstations, and a small footprint. The process of loading, clamping, welding, and unloading is highly controllable, improving the Assembly efficiency.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the present invention;

Figure 2 is a schematic diagram of the frame structure;

Fig. 3 is a schematic diagram of the structure of the vertical lift platform;

Fig. 4 is a schematic diagram of the structure of the upper external pressure fixture;

Fig. 5 is a schematic diagram of the structure of the lower external pressure fixture;

Fig. 6 is a structural schematic diagram of the clamping mechanism of the lower clamp;

Fig. 7 is a structural schematic diagram of the cylinder section positioning fixture;

Fig. 8 is a structural schematic diagram of a friction stir welding mechanism;

In the figure: 1 frame, 2 vertical lifting platform, 3 upper external pressure fixture, 4 lower external pressure fixture, 5 friction stir welding mechanism, 11 reinforcement layer, 12 column, 13 linear guide rail, 14 linear rack, 21 platform rotary drive Motor, 22 platform base, 23 platform lifting drive motor, 24 workpiece connection table, 31 upper fixture mounting seat, 32 upper fixture circumferential driving motor, 33 upper fixture slewing bearing, 34 upper fixture base, 35 upper fixture clamping mechanism , 36 upper fixture angle steel, 41 lower fixture clamping mechanism, 42 cylinder section positioning fixture, 43 lower fixture base, 44 lower fixture slewing bearing, 45 lower fixture mounting seat, 46 lower fixture circumferential drive motor, 51 welding shaft, 52 Welding mechanism base, 411 clamping plate, 412 clamping guide rail, 413 lead screw, 414 lead screw bearing seat, 415 lead screw drive motor, 421 positioning fixture base, 422 positioning cylinder, 423 positioning pressure plate, 424 positioning cylinder.

Detailed ways

The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.

Example 1

As shown in Figure 1, this embodiment includes: a frame 1, a vertical lifting platform 2 for lifting a cylindrical member, a friction stir welding mechanism 5, an annular upper external pressure fixture 3 and an annular lower external pressure fixture 4, wherein: vertical The lifting platform 2, the upper external pressure fixture 3 and the lower external pressure fixture 4 are vertically and sequentially slidably arranged in the frame 1, and the upper external pressure fixture 3 and the lower external pressure fixture 4 clamp and rotate the cylindrical member, and the friction stir welding mechanism 5 Fixed on one side of rack 1.

As shown in FIG. 2 , the frame 1 includes four circularly distributed uprights 12 , and the uprights 12 are provided with linear guide rails 13 and linear racks 14 which are vertically arranged. The top and middle of the column 12 form a ring through the reinforcement layer 11 of the ring truss structure. Two linear guide rails 13 and a linear rack 14 are provided on the inner side of each column 12 for connecting and driving the vertical lift platform 2 , and the linear guide rail 13 is positioned by a guide rail positioning block on one side thereof.

As shown in Figure 3, described vertical lifting platform 2 comprises: annular platform base 22 and the workpiece connection table 24 that is used for fixing cylindrical member, wherein: platform base 22 is connected with column 12 slidingly, and workpiece connection table 24 is connected with The platform base 22 is rotatably connected. The platform base 22 is provided with four platform lifting drive motors 23, and the output end of the platform lifting drive motors 23 is connected with a gear and connected with the column 12 linear rack 14 to drive the whole vertical lifting platform 2 to move up and down. The upper part of the workpiece connecting platform 24 is fixed to the middle part of the platform base 22, and the lower part is used for solidifying with the cylindrical member. The center of the workpiece connecting platform 24 is provided with a platform rotation driving motor 21 to drive the workpiece connecting platform 24 to rotate.

As shown in Fig. 4, the described upper external pressure clamp 3 annularly includes: an upper clamp mounting base 31 and an annular upper clamp base 34, wherein: the upper clamp mounting base 31 is slidably connected with the column 12, and the upper clamp base 34 is connected by a belt The upper clamp slewing bearing 33 of the outer teeth is connected with the lower part of the upper clamp mounting base 31 , and the upper clamp base 34 is evenly distributed with several upper clamp clamping mechanisms 35 in the circumferential direction. The upper fixture mounting base 31 is provided with two upper fixture circumferential driving motors 32, which drive the upper fixture base 34 to rotate through gears meshing with the outer teeth of the upper fixture slewing bearing 33 . The upper clamp mounting seat 31 is fixed to the linear guide rail 13 of the column 12 through the upper clamp angle steel 36 arranged on the outer peripheral surface.

As shown in Figure 5, the annular lower clamp mounting base 45 and the annular lower clamp base 43, wherein: the lower clamp mounting base 45 is slidably connected with the column 12, and the lower clamp base 43 passes through the lower clamp slewing bearing with external teeth 44 is axially connected with the upper part of the lower fixture mounting seat 45, and several lower fixture clamping mechanisms 41 are evenly distributed around the lower fixture base 43. The lower clamp mounting seat 45 is fixed to the linear guide rail 13 of the column 12 through the lower clamp angle steel provided on the outer peripheral surface. The lower fixture mounting seat 45 is located in the inner circle of the center circle of the lower fixture base 43 , and several barrel segments are evenly distributed in the circumferential direction to position the fixtures 42 . The lower fixture mounting base 45 is provided with two lower fixture circumferential driving motors 46 , and the lower fixture circumferential driving motors 46 mesh with the outer teeth of the lower fixture slewing bearing 44 through gears to drive the lower fixture base 43 to rotate.

As shown in Figure 6, the lower clamping mechanism 41 includes: an arc-shaped clamping plate 411, a clamping rail 412 and a lead screw 413, wherein: the clamping rail 412 is arranged on the lower clamp base 43, and the clamping The clamping plate 411 is slidably disposed on the clamping guide rail 412 and connected with the lead screw 413 . The lead screw 413 is fixed on the lower fixture base 43 through the lead screw bearing seat 414 , and is connected to the lead screw driving motor 415 arranged at the bottom of the clamping guide rail 412 . The jig plate slides along the radial direction of the lower jig base 43 under the drive of the lead screw 413 to clamp the cylindrical member. The structure of the upper jig clamping mechanism 35 is the same as that of the lower jig clamping mechanism 41 .

As shown in Figure 7, the barrel section positioning fixture 42 includes: two positioning pressure plates 423 and a positioning cylinder 424, wherein: a rectangular groove is provided in the middle of the positioning cylinder 424, and the two positioning pressure plates 423 are arranged in the groove and are aligned with each other. Positioning cylinders 422 are connected to hold the cylindrical member. The cylinder segment positioning jig 42 is fixed on the annular positioning jig base 421 first, and then is integrally installed in the central ring of the lower jig base 43 to realize the pre-positioning function of the cylindrical member.

As shown in FIG. 8 , the welding shaft 51 of the friction stir welding mechanism 5 is fixed by a cylindrical welding mechanism base 52 , and the welding shaft 51 is fixed by a guide screw 413 to weld two cylindrical components.

When welding two cylindrical components, firstly, the two sections of cylinders to be welded and assembled are placed between the upper external pressure fixture 3 and the lower external pressure fixture 4 respectively. This process is completed with the assistance of the vertical lifting platform 2 and the cylinder segment positioning fixture 42 . Manually fix a cylinder section to be welded on the vertical lifting platform 2, place the cylinder section on the cylinder section positioning fixture 42 through the movement of the vertical lifting platform 2, and manually disconnect the cylinder section from the vertical lifting platform 2. Then another tube segment to be welded is positioned to an appropriate position with the vertical lifting platform 2, and the welding edge is aligned. The clamping mechanisms of the upper external pressure fixture 3 and the lower external pressure fixture 4 provide positioning and pressing force for the barrel section from the outside, and cooperate with specific inner support tooling to realize clamping of the welding workpiece. The clamping force and positioning position can be adjusted. The welding shaft 51 of the friction stir welding mechanism 5 starts to feed, and at the same time, the circumferential drive motor on the mounting seat of the upper external pressure clamp 3 and the mounting base of the lower external pressure clamp 4 synchronously drives the clamp base to perform a circular motion to realize the cylinder section circular seam welding. After the welding is completed, the circumferential drive motor stops moving, the welding shaft 51 withdraws, the external pressure clamp is released, and the vertical lifting platform 2 moves upwards. After the welding tool is lifted to a certain height, a crane is used to realize the lifting of the workpiece.

Compared with the prior art, the present invention adopts the vertical clamping welding method, which avoids the structural deformation of the cylindrical thin-walled member due to its own gravity, reduces the error influencing factors in the assembly process, and adopts circumferentially uniform fixtures, and all fixtures Both can be independently controlled to realize flexible clamping and active calibration of thin-walled cylinders, ensure positioning accuracy, reduce clamping positioning errors, and cooperate with special internal support fixtures to meet the welding process requirements of friction stir welding. The equipment has a high degree of automation. Concentrated stations, small footprint, highly controllable loading, clamping, welding, and unloading processes, can realize continuous welding and assembly of multiple barrel sections, and improve assembly efficiency.

Claims (6)

1. A thin-walled cylindrical component rotary vertical assembly device, characterized in that it includes: a frame, a vertical lifting platform for lifting the cylindrical component, a friction stir welding mechanism, an annular upper external pressure clamp and an annular lower external pressure Fixtures, wherein: the vertical lifting platform, the upper external pressure fixture and the lower external pressure fixture are slid vertically and sequentially arranged in the frame, the upper external pressure fixture and the lower external pressure fixture clamp the cylindrical member and rotate the cylindrical member, friction stir welding The mechanism is fixed on one side of the frame; The frame includes four circularly distributed uprights, and the uprights are provided with vertically arranged linear guide rails and linear racks; The lower external pressure fixture includes: an annular lower fixture mounting seat and an annular lower fixture base, wherein: the lower fixture mounting seat is slidably connected to the column, and the lower fixture base is connected to the lower fixture mounting seat through a lower fixture slewing bearing with external teeth The upper part is connected axially, and there are several clamping mechanisms evenly distributed around the base of the lower fixture; On the mounting seat of the lower fixture, several positioning fixtures are evenly distributed in the circumferential direction of the center ring of the base of the lower fixture; The barrel section positioning fixture includes: two positioning platens and a positioning cylinder, wherein: a rectangular groove is provided in the middle of the positioning cylinder, and the two positioning platens are arranged in the groove and connected with the cylinder to clamp the cylindrical member. 2. The rotating vertical assembly device for thin-walled tubular members according to claim 1, wherein the upper external pressure clamp comprises: an annular upper clamp mounting seat and an annular upper clamp base, wherein: the upper clamp is installed The base is slidingly connected with the column, the upper fixture base is connected with the lower part of the upper fixture mounting seat through the upper fixture slewing bearing with outer teeth, and several clamping mechanisms are evenly distributed around the upper fixture base. 3. The rotating vertical assembly device for thin-walled tubular members according to claim 2, characterized in that the mounting seat of the upper fixture is provided with a circumferential driving motor for the upper fixture, which is connected with the outer teeth of the rotary bearing of the upper fixture through gears. Engage to drive rotation of the upper clamp base. 4. The rotating vertical assembly device for thin-walled tubular members according to claim 1, characterized in that, the mounting seat of the lower fixture is provided with a circumferential driving motor for the lower fixture, and the circumferential driving motor of the lower fixture communicates with the lower fixture through gears. The external teeth of the clamp slewing bearing are engaged to drive the rotation of the lower clamp base. 5. The rotating vertical assembly device for thin-walled tubular members according to claim 1 or 2, wherein the clamping mechanism comprises: an arc-shaped clamping plate, a clamping guide rail and a lead screw, wherein The clamping guide rail is arranged on the fixture base, and the clamping plate is slidably arranged on the clamping guide rail and connected with the lead screw. 6. The rotating vertical assembly device for thin-walled cylindrical components according to claim 1, wherein the vertical lifting platform comprises: a ring-shaped platform base and a workpiece connection platform for fixing cylindrical components, wherein: The platform base is slidingly connected with the column, and the workpiece connecting platform is connected with the platform base in rotation.