CN212761640U - Magnetron blast pipe subassembly anchor clamps of brazing - Google Patents

Abstract

The utility model provides a magnetron blast pipe subassembly anchor clamps of brazing, including upper fixture, lower fixture, the blast pipe subassembly sets up in the main cavity body of upper fixture, the lower fixture is the cylinder structure, at least partial cylinder structure of lower fixture is laminated with the bottom of blast pipe subassembly, is used for supporting blast pipe subassembly, upper fixture, set up concentrically between upper fixture, blast pipe subassembly, the lower fixture sets up subtracts heavy structure; a magnetron blast pipe subassembly anchor clamps of brazing, carry out the condition of centre gripping assembly to each spare part of blast pipe subassembly under the combined action of last anchor clamps and lower anchor clamps, through setting up subtract heavy structure, be favorable to practicing thrift the material of anchor clamps down, reduce the weight of anchor clamps down, be favorable to alleviateing operating personnel's operating load simultaneously.

Description

Magnetron blast pipe subassembly anchor clamps of brazing

Technical Field

The utility model relates to a magnetron blast pipe subassembly anchor clamps of brazing.

Background

A magnetron is an electric vacuum device used to generate microwave energy; in the production of the magnetron, the exhaust pipe component of the magnetron comprises an insulating structure made of ceramic and a component structure made of metal; therefore, the insulating structure made of ceramic and the component structure made of metal need to be assembled and limited in the machining process of the exhaust pipe component, then welding is carried out, and finally the exhaust pipe component with an integrated structure is machined.

The brazing clamp in the prior art often includes anchor clamps and lower anchor clamps, except the necessary assembly chamber of last anchor clamps, all the other structures often are solid body structure, and not only the quality is bigger than normal, and the operating personnel's of being inconvenient for hold, in the operation assembly line, increase unnecessary operating load easily, the manufacturing material is more moreover, is unfavorable for reducing the manufacturing cost of anchor clamps.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a magnetron blast pipe subassembly anchor clamps of brazing to solve the anchor clamps of brazing quality that exists among the prior art big partially, hold inconvenient scheduling problem.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

a magnetron exhaust pipe assembly brazing clamp comprises an upper clamp and a lower clamp, wherein an exhaust pipe assembly is arranged in a main cavity of the upper clamp, the lower clamp is of a cylinder structure, at least part of the cylinder structure of the lower clamp is attached to the bottom of the exhaust pipe assembly and used for supporting the exhaust pipe assembly and the upper clamp, the exhaust pipe assembly and the lower clamp are concentrically arranged; the lower clamp is provided with a weight reduction structure; therefore, under the condition that all parts of the exhaust pipe assembly are clamped and assembled under the combined action of the upper clamp and the lower clamp, the weight reducing structure is arranged, materials of the lower clamp can be saved, the weight of the lower clamp can be reduced, and meanwhile, the operation load of operators can be reduced.

Furthermore, the weight reducing structure comprises a bottom weight reducing groove and weight reducing holes, the bottom weight reducing groove is arranged at the bottom end of the lower clamp, and the weight reducing holes penetrate through part of the column body structure of the lower clamp in the vertical direction; the weight reducing structure comprises a central hole, and the central hole penetrates through the lower clamp in the vertical direction; therefore, the lower clamp is provided with a plurality of weight reduction structures, the weight of the lower clamp can be reduced to the maximum extent, and materials of the lower clamp are saved.

Furthermore, the lightening hole is communicated with the bottom lightening groove, and/or the central hole is communicated with the bottom lightening groove; therefore, the weight reducing structures are communicated, on one hand, the weight of the lower clamp can be further reduced, the material of the lower clamp is saved, on the other hand, high-temperature gas can flow in the lower clamp, the exhaust pipe assembly and the upper clamp through the related weight reducing structures in the high-temperature welding process, and the uniform temperature distribution is facilitated.

Further, the lower clamp comprises a first cylinder, a second cylinder, a third cylinder, a fourth cylinder and a fifth cylinder which are sequentially connected from top to bottom, and the first cylinder, the second cylinder, the third cylinder, the fourth cylinder and the fifth cylinder are concentrically arranged; therefore, the specific structure of the lower clamp is limited, so that the lower clamp can keep good limiting and assembling relation with the A-side pipe and the small choking sleeve.

Furthermore, a bottom lightening groove is formed in the bottom end of the fifth column body, and lightening holes penetrate through the fourth column body and the fifth column body in the vertical direction; preferably, the lower fixture is provided with a plurality of lightening holes, and the lightening holes are arranged in a circumferential array mode by taking the center of the lower fixture as the center of a circle; therefore, on one hand, the structure of the lower clamp can be optimized, the weight of the lower clamp is fully reduced, the material of the lower clamp is saved, and on the other hand, the uniform distribution and flowing of high-temperature gas are facilitated.

Furthermore, the central hole sequentially penetrates through the first cylinder, the second cylinder, the third cylinder, the fourth cylinder and the fifth cylinder in the vertical direction; therefore, high-temperature gas can directly flow into the exhaust pipe assembly through the central hole, and the uniform distribution of temperature is facilitated.

Further, the bottom outer edge of the upper clamp is provided with a bottom chamfer, the bottom outer edge of the lower clamp is provided with a fifth chamfer, so that an operator can conveniently take up the lower clamp, and the partial structure of the lower clamp is omitted, the material consumption is reduced, and the cost is saved.

Compared with the prior art, the magnetron blast pipe assembly brazing clamp has the following advantages:

a magnetron blast pipe subassembly anchor clamps of brazing, carry out the condition of centre gripping assembly to each spare part of blast pipe subassembly under the combined action of last anchor clamps and lower anchor clamps, through setting up subtract heavy structure, be favorable to practicing thrift the material of anchor clamps down, reduce the weight of anchor clamps down, be favorable to alleviateing operating personnel's operating load simultaneously.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:

fig. 1 is an exploded view of a magnetron exhaust pipe assembly according to an embodiment of the present invention before welding;

FIG. 2 is an isometric view of a magnetron exhaust pipe assembly according to an embodiment of the invention after welding;

fig. 3 is a schematic structural view of a small choke sleeve in a magnetron exhaust pipe assembly according to an embodiment of the present invention;

fig. 4 is an isometric view of an upper fixture in a brazing fixture for a magnetron exhaust pipe assembly according to an embodiment of the present invention;

fig. 5 is a cross-sectional view of an upper fixture in a brazing fixture for a magnetron exhaust pipe assembly according to an embodiment of the present invention;

fig. 6 is a partial enlarged view of the present invention at a in fig. 5;

fig. 7 is a top view of a lower fixture of a brazing fixture for a magnetron exhaust pipe assembly according to an embodiment of the present invention;

fig. 8 is a cross-sectional view of a lower fixture in a brazing fixture for a magnetron exhaust pipe assembly according to an embodiment of the present invention.

Description of reference numerals:

the upper jig 1, the main body 10, the first chamber 11, the second chamber 12, the third chamber 13, the first wall 131, the first groove 132, the fourth chamber 14, the second wall 141, the second groove 142, the fifth chamber 15, the sixth chamber 16, the seventh chamber 17, the eighth chamber 18, the bottom chamfer 19, the lower jig 2, the first cylinder 21, the first chamfer 211, the top end 212, the second cylinder 22, the second chamfer 221, the third cylinder 23, the third chamfer 231, the fourth cylinder 24, the fourth chamfer 241, the fifth cylinder 25, the fifth chamfer 251, the center hole 26, the bottom weight-reducing groove 27, the weight-reducing hole 28, the exhaust pipe 3, the first pipe section 31, the first end 32, the second pipe section 33, the first solder piece 4, the insulating ring 5, the upper end 51, the second solder piece 6, the a-side pipe 7, the pipe body 71, the bottom end 72, the first pipe body 73, the first skirt contracting pipe 74, the second pipe body 75, a second shrink tube 76, a third tube body 77, a small choke sleeve 8, a choke section 81 and a flange 82.

Detailed Description

The inventive concepts of the present disclosure will be described hereinafter using terms commonly employed by those skilled in the art to convey the substance of their work to others skilled in the art. These utility concepts may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of their inclusion to those skilled in the art.

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

In order to solve the problems of unreasonable structural design of a brazing clamp in the prior art, especially the problems of large mass, inconvenient holding and the like of the brazing clamp, the embodiment provides a brazing clamp for a magnetron exhaust pipe assembly, as shown in fig. 1-8, the brazing clamp comprises an upper clamp 1 and a lower clamp 2, the upper clamp 1 is provided with a main cavity 10, the exhaust pipe assembly is arranged in the main cavity 10, the exhaust pipe assembly is attached to at least part of the side wall of the main cavity 10, the lower clamp 2 is in a cylindrical structure, the lower clamp 2 is arranged at the bottom of the exhaust pipe assembly, and at least part of the cylindrical structure of the lower clamp 2 is attached to the bottom of the exhaust pipe assembly and is used for supporting the exhaust pipe assembly and the upper clamp 1; therefore, after the exhaust pipe assembly is installed in the brazing clamp, the exhaust pipe assembly is borne above the lower clamp 2, the upper clamp 1 is sleeved outside the exhaust pipe assembly, and the upper clamp 1 and the lower clamp 2 clamp and limit all parts of the exhaust pipe assembly together.

Before describing the case of the concentricity defined by the clamp, for convenience of describing the assembling relationship, the specific structure of the exhaust pipe assembly is described; before welding, the components of the exhaust pipe assembly are arranged in the main cavity 10 of the upper clamp 1 or placed on the lower clamp 2 according to a certain sequence; specifically, the exhaust pipe assembly comprises an exhaust pipe 3, a first solder sheet 4, an insulating ring 5, a second solder sheet 6, an A-side pipe 7 and a small choking sleeve 8 which are sequentially connected from top to bottom;

the insulating ring 5 is usually made of nonmetal materials for insulation, and the exhaust pipe 3 and the A side pipe 7 are made of metal materials; therefore, in order to join members of different materials, it is necessary to provide solder pieces on the upper end surface 51 and the lower end surface of the insulating ring 5, respectively.

The exhaust pipe 3 comprises a first pipe section 31 and a second pipe section 33 which are sequentially connected from top to bottom, the inner diameter of the second pipe section 33 is larger than that of the first pipe section 31, and one end face, close to the first pipe section 31, of the second pipe section 33 is marked as a first end face 32; the second pipe section 33 is in an expanded end structure on the whole exhaust pipe 3, the second pipe section 33 is used as a transition connecting section, the exhaust pipe 3 is matched with the upper end surface 51 of the insulating ring 5, and the first solder sheet 4 is arranged between the second pipe section 33 and the upper end surface 51 of the insulating ring 5; so that, after the welding is completed, the first end face 32 of the second tubular segment 33 is connected to the first tubular segment 31; the other end of the second tube section 33 is connected to the upper end face 51 of the insulating ring 5 by means of the first solder tab 4 in the direction away from the first tube section 31. Furthermore, the end of the first tube section 31 acts as a microwave emitting end in a direction away from the second tube section 33.

The second solder sheet 6 is arranged between the lower end surface of the insulating ring 5 and the A-side tube 7 and is used for welding the insulating ring 5 and the A-side tube 7 which are made of different materials together; the side A pipe 7 comprises a skirt pipe body 71, a bottom end face 72, a first pipe body 73, a first shrinkage pipe 74, a second pipe body 75, a second shrinkage pipe 76 and a third pipe body 77 which are connected in sequence from bottom to top; the first shrinkage pipe 74 and the second shrinkage pipe 76 are both reducer pipes, and the pipe diameters of the reducer pipes are gradually reduced from bottom to top, so that the inner diameter of the first pipe 73 is larger than that of the second pipe 75, and the inner diameter of the second pipe 75 is larger than that of the third pipe 77; the top end of the third tube 77 is soldered to the lower end surface of the insulating ring 5 by the second solder piece 6.

For the connection between the small choke sleeve 8 and the A side pipe 7, the two are made of metal materials and can be directly welded together; for the fitting relationship between the two, the small choke sleeve 8 comprises a choke tube section 81, a flange 82, the flange 82 surrounding the outer edge of the choke tube section 81 at its upper end. The flange 82 is clamped with the third pipe body 77; preferably, the diameter of the outer edge of the flange 82 is equal to the inner diameter of the third tube 77, or the flange 82 is in interference fit with the third tube 77; the choke section 81 has an outer diameter smaller than the inner diameter of the third tubular body 77, the upper end of the choke section 81 is connected to a flange 82, and the lower end of the choke section 81 extends into the a-side tube 7.

After the description of the respective parts of the exhaust pipe assembly, the structure of the upper jig 1 and the assembly of the exhaust pipe assembly in the upper jig 1 are described:

the upper clamp 1 is provided with a main cavity 10, and the main cavity 10 penetrates through the upper clamp 1 in the vertical direction; the main cavity 10 comprises a first cavity 11, a second cavity 12, a third cavity 13, a fourth cavity 14, a fifth cavity 15, a sixth cavity 16, a seventh cavity 17 and an eighth cavity 18 which are sequentially communicated from top to bottom; the first chamber 11, the second chamber 12, the third chamber 13, the fourth chamber 14, the fifth chamber 15, the sixth chamber 16, the seventh chamber 17, and the eighth chamber 18 are all concentrically arranged.

The inner wall of the first chamber 11 is attached to the outer wall of the first pipe section 31 of the exhaust pipe 3, and the first chamber 11 and the first pipe section 31 are concentrically arranged. The inner wall of the third chamber 13 is attached to the outer wall of the second pipe section 33 of the exhaust pipe 3, and the third chamber 13 and the second pipe section 33 are concentrically arranged.

For the second chamber 12, a transition chamber; the second chamber 12 and the first pipe section 31 are arranged concentrically, but the inner wall of the second chamber 12 is not attached to the outer wall of the first pipe section 31 of the exhaust pipe 3; preferably, the diameter of the second chamber 12 on the horizontal plane is gradually increased from top to bottom, that is, the second chamber 12 is an open chamber gradually enlarged from top to bottom, so that the exhaust pipe 3 is conveniently loaded into or poured out of the main chamber 10, and the assembly and disassembly convenience of the exhaust pipe assembly in the assembly and disassembly processes of the brazing jig is improved.

The inner wall of the fourth cavity 14 is attached to the outer wall of the insulating ring 5, and the fourth cavity 14 and the insulating ring 5 are arranged concentrically. Fifth cavity 15 is as the changeover portion, with second shrink tube 76, the concentric setting of third body 77, and diameter on the horizontal plane of fifth cavity 15 is from last to crescent down, is convenient for assemble or dismantle A side pipe 7 and main cavity 10, is favorable to improving the dismouting convenience of blast pipe subassembly assembly, dismantlement in-process in the anchor clamps of brazing.

The inner wall of the sixth chamber 16 is attached to the outer wall of the second tube 75 of the side a tube 7, and the sixth chamber 16 and the second tube 75 are concentrically arranged. The inner cavity of the seventh chamber 17 is attached to the outer wall of the first shrink tube 74 of the side a tube 7, and the seventh chamber 17 and the first shrink tube 74 are concentrically arranged. The inner wall of the eighth chamber 18 is attached to the outer wall of the first tube 73 of the side a tube 7, and the eighth chamber 18 is concentric with the first tube 73.

Thereby through set up a plurality of concentric cavity structures that set up in anchor clamps 1, it is spacing to laminate to the relevant subassembly structure of exhaust pipe subassembly for the relevant subassembly structure of exhaust pipe subassembly is concentric assembly with the cavity structure that corresponds equally, thereby has ensured that anchor clamps 1 has good concentricity restriction to the relevant subassembly structure of exhaust pipe subassembly, has avoided the condition of taking place the dislocation between each spare part to a certain extent, is favorable to improving the off-the-shelf yields of welding back.

In addition, the bottom outer edge of the upper clamp 1 is provided with the bottom chamfer 19, so that an operator can conveniently take the upper clamp 1, and the partial structure of the upper clamp 1 is omitted, the material consumption is reduced, and the cost is saved.

As shown in fig. 5-6, in order to further facilitate the disassembly and assembly of the upper clamp 1 and the exhaust pipe assembly, the upper clamp 1 further includes an avoiding groove cavity, the avoiding groove cavity is communicated with the main cavity 10, and the main cavity 10, the avoiding groove cavity and the exhaust pipe assembly are concentrically arranged, so as to leave a certain disassembly and assembly space for the partial assembly structure of the exhaust pipe assembly, thereby improving the convenience of disassembly and assembly. Specifically, the avoiding groove cavity comprises a first groove cavity 132 and a second groove cavity 142; because the second pipe section 33 of the exhaust pipe 3 is an expanded end part and has a certain angle, for the convenience of assembly, the third chamber 13 is provided with a first slot 132 at a side close to the second chamber 12, and the first slot 132 is communicated with the main chamber 1; similarly, since the insulating ring 5 has a certain angle of rotation between the second section 33 of the exhaust pipe 3 and the second section, the fourth chamber 14 is provided with a second slot 142 on a side close to the third chamber 13 for easy assembly, and the second slot 142 is communicated with the main chamber 1.

For the lower clamp 2, the lower clamp 2 is a cylinder structure and at least comprises a first cylinder 21 and a third cylinder 23 which are concentrically arranged from top to bottom, the outer wall of the first cylinder 21 is attached to the inner wall of the choke pipe section 81, the A-side pipe 7 is sleeved outside the lower clamp 2 and the small choke sleeve 8, the third pipe body 77 of the A-side pipe 7 is attached to or in interference fit with the flange 82 of the small choke sleeve 8, the outer wall of the third cylinder 23 is attached to the inner wall of the first pipe body 73 of the A-side pipe 7, so that the lower clamp 2, the A-side pipe 7 and the small choke sleeve 8 are concentrically arranged,

thereby through the setting of anchor clamps 2 down, A side pipe 7, little choke cover 8 when with the assembly of anchor clamps 2 down, just directly realized the concentric setting between little choke cover 8 and the A side pipe 7, not only the form is simple, the dismouting convenience is better, can directly inject the concentricity between the relevant spare part of blast pipe subassembly in addition, avoided the condition of taking place the dislocation between each spare part to a certain extent, be favorable to improving the off-the-shelf yields of welding back.

Thus, by the structural introduction, in the process of assembling the relevant parts of the exhaust pipe assembly before welding, the exhaust pipe 3, the first solder piece 4, the insulating ring 5 and the second solder piece 6 are firstly placed in the main cavity 10 of the upper fixture 1 in sequence, and the concentricity of the relevant parts can be directly limited in the placing process; then the small choke sleeve 8 is sleeved outside the first column body 21 of the lower clamp 2, the A side pipe 7 is sleeved outside the small choke sleeve 8 and the lower clamp 2, and the concentricity of the A side pipe 7 and the central hole 26 can be directly limited in the placing process; last anchor clamps 1 is detained and is put on A side pipe 7 for A side pipe 7 outer wall is concentric with main cavity body 10 inner wall, thereby at last anchor clamps 1, on anchor clamps 2 carries out the basis of injecing with one heart to the relevant spare part of blast pipe subassembly down, again with A side pipe 7 outer wall is concentric with main cavity body 10 inner wall, can be simply conveniently with last anchor clamps 1, anchor clamps 2 down, the relevant spare part of blast pipe subassembly all is injectd for concentric setting, ensure the concentricity on the one hand, carry on spacingly to the relevant spare part of blast pipe subassembly, the condition of taking place the dislocation between each spare part has been avoided, be favorable to improving the off-the-shelf yields after the welding, on the other hand to the blast pipe subassembly, realized simple convenient dismouting, be favorable to improving its dismouting convenience.

For the specific structure of the lower clamp 2, the lower clamp 2 is a stepped cylinder structure, and includes a first cylinder 21, a second cylinder 22, a third cylinder 23, a fourth cylinder 24, and a fifth cylinder 25, which are sequentially connected from top to bottom, where the first cylinder 21, the second cylinder 22, the third cylinder 23, the fourth cylinder 24, and the fifth cylinder 25 are concentrically arranged.

On the basis of concentric cooperation of first cylinder 21 and little choke sleeve 8, the concentric complex of first body 73 of third cylinder 23 and A side pipe 7, set up second cylinder 22 between first cylinder 21, the third cylinder 23, the external diameter of second cylinder 22 is between the external diameter of first cylinder 21, the external diameter of third cylinder 23, and the external diameter of first cylinder 21 < the external diameter of second cylinder 22 < the external diameter of third cylinder 23 promptly, simultaneously the top outer fringe of second cylinder 22 sets up second chamfer 221 to on the one hand second cylinder 22 supports little choke sleeve 8, and on the other hand second cylinder 22 and A side pipe 7 contactless leave certain dismouting space for between third cylinder 23 and the A side pipe 7, avoid the assembly card to die, be favorable to improving the dismouting convenience of blast pipe subassembly in assembly, the dismantlement process in the anchor clamps of brazing.

Simultaneously, the top outer fringe of first cylinder 21 sets up first chamfer 211, and when the assembly, first chamfer 211 and little choke sleeve 8 contactless to be convenient for assemble little choke sleeve 8, also be favorable to carrying out the form removal to the exhaust pipe subassembly after the welding simultaneously, with the dismouting convenience that improves anchor clamps 2 down.

The outer wall of the third cylinder 23 is attached to the inner wall of the first pipe 73, and the third cylinder 23 and the first pipe 73 are arranged concentrically; a third chamfer 231 is arranged on the outer edge of the top of the third cylinder 23, and the third chamfer 231 is attached to and concentrically arranged with the first shrink tube 74;

in addition, in order to further limit the concentric assembly between the a-side tube 7 and the small choke sleeve 8, the outer wall of the fourth cylinder 24 is attached to the inside of the skirt tube 71, and the fourth cylinder 24 is arranged concentrically with the skirt tube 71; the top outer edge of the fourth cylinder 24 is provided with a fourth chamfer 241, the fourth chamfer 241 is not in contact with the skirt pipe body 71, so that a certain space is reserved for assembling and disassembling the A-side pipe 7, the exhaust pipe assembly is assembled and disassembled conveniently, and the disassembly and assembly convenience is improved.

The fifth column 25 is arranged to facilitate holding of the lower clamp 2 by an operator, so as to facilitate operations such as assembly, integral movement and the like of the exhaust pipe assembly; the bottom outer edge of the fifth column 25 is provided with a fifth chamfer 251, so that on one hand, an operator can conveniently take up the lower clamp 2, on the other hand, part of the structure of the lower clamp 2 is omitted, the material consumption is reduced, and the cost is saved.

In order to further save the material of the lower clamp 2 and reduce the weight of the lower clamp 2, the lower clamp 2 is provided with a weight reduction structure. Specifically, the weight reducing structure comprises a bottom weight reducing groove 27 and a weight reducing hole 28, the bottom weight reducing groove 27 is arranged at the bottom end of the fifth column 25, and the weight reducing hole 28 penetrates through the fourth column 24 and the fifth column 25 in the vertical direction; preferably, the lightening holes 28 are communicated with the bottom lightening slots 27; furthermore, the lower jig 2 is provided with a plurality of lightening holes 28, and the lightening holes 28 are arranged in a circumferential array with the center of the lower jig 2 as the center.

In addition, the weight reducing structure further comprises a central hole 26, and the central hole 26 sequentially penetrates through the first cylinder 21, the second cylinder 22, the third cylinder 23, the fourth cylinder 24 and the fifth cylinder 25 in the vertical direction; preferably, the central hole 26 communicates with a bottom lightening groove 27; thereby being beneficial to further saving the material of the lower clamp 2 and reducing the weight of the lower clamp 2.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. The brazing clamp for the magnetron exhaust pipe assembly is characterized by comprising an upper clamp (1) and a lower clamp (2), wherein the exhaust pipe assembly is arranged in a main cavity (10) of the upper clamp (1), the lower clamp (2) is of a cylinder structure, at least part of the cylinder structure of the lower clamp (2) is attached to the bottom of the exhaust pipe assembly and used for supporting the exhaust pipe assembly and the upper clamp (1), the exhaust pipe assembly and the lower clamp (2) are concentrically arranged; the lower clamp (2) is provided with a weight reduction structure.

2. The magnetron exhaust pipe assembly brazing jig as claimed in claim 1, wherein the weight reducing structure comprises a bottom weight reducing groove (27) and a weight reducing hole (28), the bottom weight reducing groove (27) is arranged at the bottom end of the lower jig (2), and the weight reducing hole (28) penetrates through a part of a cylindrical structure of the lower jig (2) in a vertical direction.

3. A magnetron exhaust pipe assembly brazing jig according to claim 1, characterized in that the weight reducing structure comprises a central hole (26), the central hole (26) penetrating the lower jig (2) in a vertical direction.

4. A magnetron exhaust pipe assembly brazing jig according to any one of claims 2 or 3, characterized in that the lightening holes (28) communicate with the bottom lightening grooves (27) and/or the center hole (26) communicates with the bottom lightening grooves (27).

5. The magnetron exhaust pipe assembly brazing jig as defined in any one of claims 1 to 3, wherein the lower jig (2) comprises a first cylinder (21), a second cylinder (22), a third cylinder (23), a fourth cylinder (24) and a fifth cylinder (25) which are connected in sequence from top to bottom, and the first cylinder (21), the second cylinder (22), the third cylinder (23), the fourth cylinder (24) and the fifth cylinder (25) are concentrically arranged.

6. The magnetron exhaust pipe assembly brazing jig as defined in claim 5, wherein a bottom lightening groove (27) is provided at a bottom end of the fifth cylinder (25), and lightening holes (28) penetrate the fourth cylinder (24) and the fifth cylinder (25) in a vertical direction.

7. The magnetron exhaust pipe assembly brazing jig as claimed in claim 6, wherein the lower jig (2) is provided with a plurality of lightening holes (28), and the lightening holes (28) are arranged in a circumferential array around the center of the lower jig (2).

8. The magnetron exhaust pipe assembly brazing jig as claimed in claim 5, wherein the center hole (26) penetrates the first cylinder (21), the second cylinder (22), the third cylinder (23), the fourth cylinder (24) and the fifth cylinder (25) in sequence in a vertical direction.

9. The magnetron exhaust pipe assembly brazing jig as defined in claim 1, wherein a bottom peripheral edge of the upper jig (1) is provided with a bottom chamfer (19), and a bottom peripheral edge of the lower jig (2) is provided with a fifth chamfer (251).

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