A special flip rotary table for electron beam welding of spherical head

Abstract

The application discloses a special overturning and rotating workbench for electron beam welding of spherical heads, and belongs to the field of electron beam welding workbenches, which comprises a base, wherein a box body with an overturning function is arranged on the base, the box body is connected with the base through an overturning mechanism, and the box body is connected with a workbench through a rotating mechanism; overturning transmission of the workbench is realized through a servo motor, a planetary reducer and a gear assembly in the overturning mechanism, and rotating transmission of the workbench is realized through a rotating motor, a double-lead worm, a worm wheel, a double gear, a cross roller bearing, a tapered roller bearing and a lock nut rotation in the rotating mechanism, therefore, the special overturning and rotating workbench for electron beam welding of spherical heads with the above structure is used to realize omnibearing flexible adjustment of the head in the welding process, improve welding efficiency and quality, ensure the stability of clamping, meanwhile, the workbench is enhanced in universality, and enterprise cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electron beam welding workbench, in particular to a special overturning and rotating workbench for electron beam welding of spherical heads. BACKGROUND

[0002] Electron beam welding is a high-energy density welding method, which has the advantages of fast welding speed, large depth-to-width ratio of weld, small heat-affected zone, etc., and is widely used in aerospace, automobile manufacturing, pressure vessels and other fields. In the process of electron beam welding, the welding of the head is an important link. However, since the head is a hollow hemispherical shape and weighs 40 tons, the center of the overturning requirement shaft must be coaxial with the center of the head. The existing workbench often cannot meet the flexible overturning and rotating requirements of the head during welding, and due to the requirement for the center position of the rotating trunnion, if the trunnion is placed on both sides, the overall size will be greatly increased, thereby increasing the requirements for vacuum chambers, pump sets, etc.

[0003] During the process of electron beam welding of the head, multi-angle and multi-position welding operations are required for the head, and the existing workbench often has the following shortcomings:

[0004] Firstly, the existing workbench has single overturning and rotating functions, cannot realize flexible adjustment of multiple angles, and thus it is difficult to accurately position the welding position when welding complex-shaped heads, affecting the welding efficiency and quality.

[0005] Secondly, the entire head cannot be welded as a whole, since the head is composed of multiple semi-arc-shaped workpieces, it can only be welded by opening and closing the furnace multiple times, which is repetitive, tedious and low in work efficiency.

[0006] Thirdly, the existing workbench has poor universality and cannot adapt to heads of different sizes and shapes, increasing the equipment cost of enterprises.

[0007] Fourthly, the existing workbench is large in size, greatly affecting the volume of the vacuum chamber, thereby affecting the vacuum pumping speed and increasing the equipment cost of enterprises. SUMMARY

[0008] To solve the problems in the above background art, the present application provides a special overturning and rotating workbench for electron beam welding of spherical heads, which aims to realize flexible adjustment of the head in the welding process, improve the welding efficiency and quality, ensure the stability of clamping, and enhance the universality of the workbench while reducing the cost of enterprises.

[0009] To achieve the above-mentioned purpose, the present application provides a special overturning and rotating workbench for electron beam welding of spherical heads, which comprises a base, a box body with overturning function is arranged on the base, the box body is connected with the base through an overturning mechanism, and the box body is connected with the workbench through a rotating mechanism.

[0010] Preferably, the base comprises a bottom plate arranged at the bottom end, a reinforcing rib one arranged at both sides of the top end of the bottom plate, and a support arm arranged at the middle of the top end of the bottom plate, and an ear shaft arranged at the top end of the support arm.

[0011] Preferably, the top end of the support arm is provided with a support arm upper cover, the support arm upper cover is arranged on the ear shaft, and the ear shaft is connected with the support arm and the support arm upper cover through a YRT bearing and a cylindrical roller bearing.

[0012] Preferably, both sides of the top end of the support arm are provided with box seats, the box seats are sleeved on both ends of the ear shaft, and the box seats are connected with the box body.

[0013] Preferably, the rear end of the support wall is connected with the back plate through the reinforcing rib two.

[0014] Preferably, the overturning mechanism comprises an overturning reduction box arranged on the base, a servo motor arranged on the base, an output end of the servo motor connected with a shaft coupling one through a planetary reducer, the shaft coupling one connected with a rotating shaft through a worm and gear structure arranged in the overturning reduction box, an overturning gear one arranged on the rotating shaft, the overturning gear one engaged with an overturning gear two, and the overturning gear two centered through the ear shaft and connected with the box body.

[0015] Preferably, the overturning mechanism is provided with two groups, and the two groups of overturning mechanisms are symmetrically distributed about the center of the box body.

[0016] Preferably, the rotating mechanism comprises a double-gear anti-backlash reduction box arranged on the box body, a double-lead worm one and a double-lead worm two rotatably arranged in the double-gear anti-backlash reduction box, one end of the double-lead worm one connected with an output end of a rotating motor through a shaft coupling two, the other end of the double-lead worm one connected with the double-lead worm two through a spline sleeve, and the double-lead worm two connected with a worm wheel two.

[0017] Preferably, the double-lead worm one is connected with a worm wheel one, the double-lead worm two is connected with the worm wheel two, the worm wheel one is provided with a gear one, the worm wheel two is provided with a gear two, the gear one and the gear two are engaged with an outer tooth cross roller bearing, an inner ring of the outer tooth cross roller bearing is connected with the box body, and an outer ring of the outer tooth cross roller bearing is connected with a workbench.

[0018] Preferably, one end of the double-lead worm one and one end of the double-lead worm two away from the spline sleeve are connected with the double-gear anti-backlash reduction box through a tapered roller bearing, and the one end of the double-lead worm one and the one end of the double-lead worm two connected with the tapered roller bearing are provided with a lock nut.

[0019] Therefore, the special overturning and rotating workbench for electron beam welding spherical heads has the following beneficial effects:

[0020] (1) The present application can realize flexible and accurate adjustment of the head in the welding process through the cooperation of the overturning and rotating mechanism, improve the welding efficiency and quality;

[0021] (2) The workbench of the present application can clamp heads of different sizes and shapes, reduce displacement and shaking during welding, and increase the versatility of the workbench;

[0022] (3) The present application realizes overturning transmission through servo motor, planetary reducer, gear assembly, realizes rotating transmission through rotating motor, double lead worm, worm wheel, double gear, cross roller bearing and tapered roller bearing and lock nut rotation, ensures the accuracy and reliability of the workbench in long-term use;

[0023] (4) The trunnion of the present application is arranged at the center position of the workbench, which reduces the size and the size of the matching equipment, and reduces the cost of the enterprise;

[0024] (5) The electron beam welding requires vacuumizing, and due to the large size of the head, the vacuumizing requires a long time, and the existing single sector welding structure needs to adjust the position of the head, so multiple vacuumizing is required, which consumes a long time. Compared with the existing single sector welding structure, the workbench of the present application has the functions of overturning and rotating, can adjust the position of the head in all directions, only needs to vacuum once to weld all the welds, and has higher accuracy and higher fault tolerance, which ensures the welding quality and improves the welding efficiency.

[0025] The technical solutions of the present application will be further described in detail below through the drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a whole structure diagram of the overturning and rotating workbench of the embodiment of the present application;

[0027] Figure 2 It is a perspective view of the base of the embodiment of the present application;

[0028] Figure 3 It is a trunnion structure diagram of the embodiment of the present application;

[0029] Figure 4 It is a perspective view of the overturning mechanism of the embodiment of the present application Figure 1 ;

[0030] Figure 5 It is a perspective view of the overturning mechanism of the embodiment of the present application Figure 2 ;

[0031] Figure 6 It is a schematic diagram of the internal structure of the overturning reduction box of the embodiment of the present application;

[0032] Figure 7 It is a schematic diagram of the overturning gear connection of the embodiment of the present application;

[0033] Figure 8 Rotating mechanism for the embodiment of the present application Figure 1 ;

[0034] Figure 9 Rotating mechanism for the embodiment of the present application Figure 2 ;

[0035] Figure 10 Double gear anti-backlash reduction box internal structure diagram for the embodiment of the present application

[0036] Figure 11 Gear and outer tooth cross roller bearing connection diagram for the embodiment of the present application

[0037] Figure 12 Lock nut connection structure diagram for the embodiment of the present application

[0038] Reference signs

[0039] 1, base; 101, bottom plate; 102, reinforcing rib one; 103, support arm; 104, support arm upper cover; 105, trunnion; 106, YRT bearing; 107, cylindrical roller bearing; 108, box seat; 109, reinforcing rib two; 110, back plate;

[0040] 2, turnover mechanism; 201, turnover reduction box; 202, servo motor; 203, planetary reducer; 204, shaft coupling one; 205, worm gear structure; 206, rotating shaft; 207, turnover gear one; 208, turnover gear two;

[0041] 3, rotating mechanism; 301, double gear anti-backlash reduction box; 302, double lead worm one; 303, double lead worm two; 304, shaft coupling two; 305, worm one; 306, worm two; 307, gear one; 308, gear two; 309, outer tooth cross roller bearing; 310, tapered roller bearing; 311, lock nut.

[0042] 4, workbench;

[0043] 5, box. DETAILED DESCRIPTION

[0044] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the embodiments of the present application are further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the embodiments of the present application and should not be used to limit the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application. The examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout.

[0045] It should be noted that the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or server comprising a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0046] Similar reference signs and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0047] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present application is usually placed, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application.

[0048] In the description of the present application, it should also be noted that unless otherwise explicitly specified and limited, the terms "providing", "installing", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0049] As shown in Figure 1 A special overturning and rotating workbench 4 for electron beam welding of spherical heads according to the present application comprises a base 1, an overturning mechanism 2 and a rotating mechanism 3. As shown in Figure 2 、 Figure 3As shown, the base 1 is provided with a box 5 with a turnover function. The base 1 comprises a bottom plate 101 provided at the bottom end, a reinforcing rib 102 provided at both sides of the top end of the bottom plate 101, and a support arm 103 provided at the middle of the top end of the bottom plate 101. The rear end of the support arm 103 is connected with a back plate 110 through a reinforcing rib 109, and the reinforcing rib, the support arm 103, the back plate 110, and the reinforcing rib 109 are all installed on the bottom plate 101 through high-strength bolts to ensure the overall structural strength and support the entire upper structure. The top end of the support arm 103 is provided with a support arm upper cover 104, and the top end of the support arm 103 is rotatably provided with a trunnion 105. The support arm upper cover 104 is covered on the trunnion 105, the top end of the support arm 103 and the support arm upper cover 104 are adapted to each other, the trunnion 105 is sleeved in them, and the trunnion 105 is connected with the support arm 103 and the support arm upper cover 104 through a 106YRT bearing and a cylindrical roller bearing 107 to provide a turnover guide function. The trunnion 105 is connected with the support arm 103 through the 106YRT bearing and the cylindrical roller bearing 107, the 106YRT bearing ensures the axial load, and the cylindrical roller bearing 107 is provided with two cylindrical roller bearings for ensuring the radial load. The top end of the support arm 103 is provided with a box seat 108, the box seat 108 is sleeved on both ends of the trunnion 105, and the box seat 108 is connected with the box 5. The box seat 108 comprises an upper cover and a base 1, the upper cover and the base 1 are adapted to each other and the trunnion 105 is sleeved in them, the box seat 108 is connected with the box 5, so that the entire box 5 performs a turnover action with the trunnion 105 as the center.

[0050] As shown in Figure 4 , Figure 5 , the box 5 is connected with the base 1 through the turnover mechanism 2. The turnover mechanism 2 is provided with two groups, and the two groups of turnover mechanisms 2 are symmetrically distributed about the center of the box 5, so that the turnover movement is more stable. As shown in Figure 6 , the turnover mechanism 2 comprises a turnover reduction box 201 provided on the base 1, a servo motor 202 provided on the base 1, an output end of the servo motor 202 connected with a shaft coupling 204 through a planetary reducer 203, and the shaft coupling 204 connected with a rotating shaft 206 through a worm gear structure 205 provided in the turnover reduction box 201. Figure 7 As shown in Figure 7 , the rotating shaft 206 is provided with a turnover gear 207, the turnover gear 207 is engaged with a turnover gear 208, the turnover gear 208 is centered by the trunnion 105 and connected with the box 5. One end of the rotating shaft 206 is rotatably connected with the turnover reduction box 201, the other end of the rotating shaft 206 penetrates out of the turnover reduction box 201 and is rotatably connected with a rotating seat located on the bottom plate 101, and the turnover gear 207 is located outside the turnover reduction box 201.

[0051] The servo motor 202, the planetary reducer 203, the coupling one 204 and the turnover reduction box 201 are installed on the bottom plate 101 of the base 1. The worm and gear structure 205 adopts an existing structure. The servo motor 202 transmits power to the worm and gear structure 205 in the turnover reduction box 201 through the planetary reducer 203 and the coupling one 204, and then drives the rotating shaft 206 to rotate. The rotating shaft 206 drives the turnover gear one 207 to rotate, and the turnover gear one 207 transmits power to the turnover gear two 208. The turnover gear two 208 is connected with the base 1 through the trunnion 105 and high-strength bolts and the box body 5, so as to drive the box body 5 to turn over through the trunnion 105.

[0052] As shown in Figure 8 , Figure 9 , the box body 5 is connected with the workbench 4 through the rotating mechanism 3. The rotating mechanism 3 includes a double-gear backlash reduction box 301 arranged on the box body 5. The double-gear backlash reduction box 301 is internally rotatably provided with a double-lead worm one 302 and a double-lead worm two 303. Figure 10 As shown in Figure 11 , one end of the double-lead worm one 302 is connected with the output end of a rotating motor through a coupling two 304. The rotating motor is installed on the double-gear backlash reduction box 301. The other end of the double-lead worm one 302 is connected with the double-lead worm two 303 through a spline sleeve. The double-lead worm one 302 is connected with a worm one 305. The double-lead worm two 303 is connected with a worm two 306. The worm one 305 is provided with a gear one 307. The worm two 306 is provided with a gear two 308. Figure 11 As shown in Figure 11 , the gear one 307 and the gear two 308 are meshed and connected with an outer tooth cross roller bearing 309. The outer ring edge of the outer tooth cross roller bearing 309 is tooth-shaped. The inner ring of the outer tooth cross roller bearing 309 is connected with the box body 5 through bolts. The outer ring of the outer tooth cross roller bearing 309 is connected with the workbench 4 through bolts.

[0053] The rotating motor drives the workbench 4 to rotate through the double-gear backlash reduction box 301, so that the head can rotate 360 degrees in the horizontal direction. The rotating motor transmits torque to the double-lead worm one 302 through the coupling two 304. The double-lead worm one 302 transmits torque to the double-lead worm two 303 through the spline sleeve. The double-lead worm one 302 and the double-lead worm two 303 transmit torque to the worm one 305 and the worm two 306. The shafts at the centers of the worm one 305 and the worm two 306 rotate in the double-gear backlash reduction box 301. The gear one 307 and the gear two 308 are installed on the worms, so as to drive the outer tooth cross roller bearing 309 to rotate, and then drive the workbench 4 to rotate. Figure 12As shown, the ends of the double-lead worm one 302 and the double-lead worm two 303 away from the toothed spline sleeve are connected with the double-gear anti-backlash reduction box 301 through the tapered roller bearing 310, and are matched with the lock nuts 311, and the lock nuts 311 are two, one at each end. The double-lead worm one 302 and the double-lead worm two 303 are not limited in the axial direction, and when rotating, the two lock nuts are rotated, and the rotating of the lock nuts makes the double-lead worm one 302 and the double-lead worm two 303 move axially to the ends of the double-gear anti-backlash reduction box 301, so that the gear one 307 and the gear two 308 move in opposite directions, thereby eliminating the rotational backlash. This method can greatly improve the rotation accuracy and the rotation structure rigidity, thereby improving the precision of the welded head and reducing the failure rate.

[0054] In use, the servo motor 202 drives the rotating shaft 206 to rotate through the planetary reducer 203, the shaft coupling one 204 and the worm gear structure 205, the rotating shaft 206 drives the turnover gear one 207 to rotate, the turnover gear one 207 drives the turnover gear two 208 to rotate, and then drives the box body 5 to turn over through the trunnion 105, the box body 5 drives the workbench 4 to turn over; the rotary motor drives the double-lead worm one 302 to rotate through the shaft coupling two 304, the double-lead worm one 302 drives the double-lead worm two 303 to rotate through the toothed spline sleeve, the double-lead worm one 302 and the double-lead worm two 303 drive the worm gear one 305 and the worm gear two 306 to rotate respectively, and then drive the gear one 307 and the gear two 308 to rotate, the gear one 307 and the gear two 308 drive the cross roller bearing to rotate, and then drive the workbench 4 to rotate.

[0055] Therefore, the application adopts the above-mentioned structure of a special turnover and rotation workbench 4 for electron beam welding of a spherical head, aiming to realize omnidirectional flexible adjustment of the head in the welding process, improve the welding efficiency and quality, ensure the stability of clamping, and at the same time, enhance the versatility of the workbench 4 and reduce the enterprise cost.

[0056] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, but not to limit them, although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can still be modified or replaced by equivalents, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present application.

Claims

1. A dedicated rotating stage for electron beam welding of spherical heads, characterized in that: Includes a base, on which is mounted a box with a flipping function. The box is connected to the base via a flipping mechanism and to the worktable via a rotating mechanism. The base includes a base plate at the bottom, with reinforcing ribs on both sides of the top of the base plate, a support arm in the middle of the top of the base plate, and a trunnion rotatably mounted on the top of the support arm. The top of the support arm is provided with a support arm cover, which covers the trunnion. The trunnion is connected to the support arm and the support arm cover through YRT bearings and cylindrical roller bearings. The top of the support arm is provided with a housing on both sides, the housing is fitted onto both ends of the trunnion, and the housing is connected to the housing body; The rear end of the support wall is connected to the back plate via a second reinforcing rib. The flipping mechanism includes a flipping reduction gearbox mounted on a base, a servo motor mounted on the base, the output end of the servo motor being connected to a first coupling via a planetary reducer, the first coupling being connected to a rotating shaft via a worm gear structure mounted inside the flipping reduction gearbox, a first flipping gear mounted on the rotating shaft, the first flipping gear meshing with a second flipping gear, the second flipping gear being centered via a trunnion and connected to the gearbox body. There are two sets of tilting mechanisms, which are symmetrically distributed about the center of the box. The rotating mechanism includes a double-gear backlash-free reducer mounted on the housing. A double-lead worm gear 1 and a double-lead worm gear 2 are rotatably mounted inside the double-gear backlash-free reducer. One end of the double-lead worm gear 1 is connected to the output end of the rotary motor through a coupling 2, and the other end of the double-lead worm gear 1 is connected to the double-lead worm gear 2 through a toothed spline sleeve. Double-lead worm gear one is connected to worm wheel one, double-lead worm gear two is connected to worm wheel two, worm wheel one is equipped with gear one, worm wheel two is equipped with gear two, gear one and gear two are meshed with external tooth cross roller bearing, the inner ring of external tooth cross roller bearing is connected to the housing, and the outer ring of external tooth cross roller bearing is connected to the worktable. Both the first and second double-lead worm gears are connected to the double-gear backlash-free reducer via tapered roller bearings at their ends away from the toothed spline sleeve. Both the first and second double-lead worm gears connected to the tapered roller bearings are equipped with lock nuts.

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