Dual in-line ceramic shell brazing fixture

Abstract

The present invention provides a fixture for brazing a dual-row in-line ceramic shell, belonging to the technical field of manufacturing packaged ceramic shells. The fixture includes a base plate, an interlayer and a cover plate. The base plate is provided with a positioning groove for placing a lead frame; the interlayer is provided with a placement hole for placing a ceramic body, a welding piece and a lead, and the hole wall of the placement hole is provided with a positioning protrusion for extending into the space between two adjacent leads on the left and right or / and the interlayer is provided with an embedding groove for embedding two U-shaped sections of the lead frame on the left and right; the bottom of the cover plate is provided with a first stop surface that cooperates with the back stop of the ceramic body and a second stop surface that cooperates with the front and rear direct connection sections of the lead frame. The fixture of the present invention adopts three layers, which can realize the limit of each component and is easy to assemble. At the same time, each row of leads is fixed with the welding piece, which reduces the difficulty of loading into the ceramic body, improves the assembly efficiency and the position accuracy of the welding piece, avoids the different solder fullness corresponding to each welding foot after brazing, and improves the yield rate.

Description

Technical Field

[0001] The invention relates to a dual in-line ceramic tube shell brazing fixture, belonging to the technical field of packaging ceramic tube shell manufacturing. Background Art

[0002] The most common tube shell of packaged electronic devices is a ceramic tube shell, which generally includes a flat package ceramic tube shell and a dual in-line ceramic tube shell. The structure of a dual in-line ceramic tube shell in the prior art is as follows: Figure 1 As shown, it includes a ceramic body 10 with a concave cavity on the front side, a calender frame 20 fixed on the top surface of the ceramic body 10 by brazing, and a plurality of leads 30 fixed on the side of the ceramic body 10 by brazing. Each lead 30 includes a welding foot 31 at the end. The concave cavity of the ceramic body 10 is used to install electronic components.

[0003] During the manufacturing process of the dual in-line ceramic package, after the metal coating is printed on the ceramic body 10 (not shown in the figure), the kovar frame 20 and the lead 30 need to be fixed on the ceramic body 10. In order to facilitate the positioning of the lead 30 in the brazing fixture, as shown in FIG. Figure 2 As shown, the leads 30 are usually connected together through a lead frame 40 (the lead frame can be cut off when the product is manufactured later), and the lead frame 40 includes a straight connection section 41 that is directly connected to the end of each column of leads 30 and extends straight, and a U-shaped section 42 that is respectively connected to the ends of two straight connection sections 41, and the U-shaped sections 42 on both sides extend toward the top surface of the ceramic body 10. In addition, in order to facilitate soldering the leads 30 to the side of the ceramic body 10, a solder sheet 50 needs to be provided between the metal printed coating on the side of the ceramic body 10 and the soldering feet 31 of each lead to serve as solder.

[0004] At present, the existing dual-in-line ceramic shell brazing fixture is usually single-layer, and a U-shaped placement groove for placing the ceramic body 10 is provided on the single-layer fixture. Before placing the ceramic body 10, it is necessary to pre-install the ceramic body 10 and the lead 30, that is, to place the ceramic body 10 between two rows of leads 30, and then insert the welding piece 50 between the ceramic body 10 and the welding foot 31 of the lead 30, and then put the pre-installed components into the fixture, wherein the front of the ceramic body 10 faces upward, and the placement groove in the fixture can limit the left and right movement of the ceramic body 10 and the lead frame 40. Then, the calender frame 20 is placed on the top surface of the ceramic body 10. After the placement is completed, the plug is inserted into the concave cavity of the ceramic body 10. On the one hand, the calender frame 20 can be limited, and on the other hand, the plug can be used to apply downward pressure to the ceramic body 10 by its own weight to prevent the ceramic body 10 from moving upward after the ceramic body 10 expands due to heat.

[0005] The problems of the above-mentioned single-layer fixture when used are:

[0006] 1. The assembly is difficult and inefficient. First, since the ceramic body 10 needs to be pre-installed between the two rows of leads 30, and the welding pins 31 of each lead are independent and often not in the same plane, the ceramic body 10 can easily hit a certain welding pin 31 and cannot be smoothly placed between the two rows of leads 30. Secondly, since the size of the ceramic body 10 is relatively small, only a few millimeters, and the size of the welding piece 50 is even smaller, it is very difficult to insert the welding piece 50 between the ceramic body 10 and the welding pin 31, and the welding piece 50 can easily fall out when it is placed in the fixture, so reassembly is required. In addition, since the calender frame 20 is not positioned, the position of the plug is not easy to find during installation, and it needs to be installed by feel, and each ceramic body 10 corresponds to a plug, and there are many plugs that need to be installed, the installation efficiency is low, and it is easy to scatter due to collision after installation.

[0007] 2. Low yield rate. First, since the solder sheet 50 is inserted manually, the insertion position cannot be accurately guaranteed. Once it is inserted crookedly, the solder fullness corresponding to each soldering foot 31 after brazing will be different, some with more solder and some with less solder. Secondly, the lead 30 and the lead frame 40 expand due to heat during the brazing process. Since the lead frame 40 lacks an upward limit, the lead 30 will move upward during the expansion process. In addition, the pulling force generated by the melting of the solder during the brazing process causes the soldering foot 31 to be misaligned with the metal printed coating on the side of the ceramic body 10, which will eventually cause the welding to be crooked. Summary of the invention

[0008] The object of the present invention is to provide a dual in-line ceramic shell brazing fixture to solve the problems that the existing single-layer fixture does not position the ferrule frame, resulting in low assembly efficiency, and does not limit the lead and lead frame, resulting in crooked welding.

[0009] To achieve the above purpose, the dual in-line ceramic shell brazing fixture of the present invention adopts the following technical solution:

[0010] A fixture for brazing a dual-row in-line ceramic shell comprises a base plate, an interlayer and a cover plate which are arranged in sequence from bottom to top, wherein the base plate is provided with a positioning groove for placing and positioning a kovable frame; the interlayer is provided with a placement hole for placing a ceramic body, a welding sheet and a lead, the placement hole passes through the interlayer up and down and corresponds to the positioning groove on the base plate up and down, so that the front of the ceramic body can contact the kovable frame, the hole wall of the placement hole is used to limit the horizontal movement of the ceramic body and the front and back movement of the lead, the hole wall of the placement hole is provided with a positioning protrusion for extending between two adjacent left and right leads or / and the interlayer is provided with an embedding groove for embedding two left and right U-shaped sections of the lead frame, so as to limit the left and right movement of the lead; the bottom of the cover plate is provided with a first stop surface for cooperating with the back stop of the ceramic body and a second stop surface for cooperating with the front and rear direct connection sections of the lead frame, so as to limit the upward movement of the ceramic body and the lead frame.

[0011] The beneficial effects of the above technical solution are as follows: the fixture in the present invention is three-layered, and a positioning groove for placing and positioning the fellable frame is provided on the bottom plate, which facilitates the installation of the fellable frame and improves assembly efficiency; a placement hole is provided on the interlayer for placing the ceramic body, the welding sheet and the lead wire, and the placement hole passes through the interlayer up and down and corresponds to the positioning groove on the bottom plate up and down, which facilitates the front side of the ceramic body to contact with the fellable frame, and then the fellable frame and the ceramic body can be fixed by brazing; the hole wall of the placement hole is used to limit the horizontal movement of the ceramic body and the forward and backward movement of the lead wire, and the hole wall of the placement hole is provided with a positioning protrusion or / and The interlayer is provided with embedding grooves for the left and right U-shaped sections of the lead frame to be embedded, so as to limit the ceramic body and the lead in the horizontal plane; the bottom of the cover plate is provided with a first stop surface for cooperating with the back stop of the ceramic body and a second stop surface for cooperating with the front and rear direct connection sections of the lead frame. In this way, the upward movement of the ceramic body and the lead frame can be limited to achieve a comprehensive limiting effect, avoid the upward movement of the ceramic body and the lead frame after thermal expansion, and cause the welding feet of the lead to be misaligned with the metal printed coating on the side of the ceramic body, thereby avoiding the problem of crooked welding, and at the same time avoid the bottom of the ceramic body failing to reliably contact the ferrule after moving upward to cause empty welding.

[0012] Furthermore, a pressing boss is provided at the bottom of the cover plate, and the first stop surface is formed by the bottom surface of the pressing boss.

[0013] The beneficial effect of the above technical solution is that: by providing a pressing boss and utilizing the bottom surface of the pressing boss to form the first stop surface, the area of ​​the first stop surface is large enough to improve the stop effect.

[0014] Furthermore, a pit is provided at the bottom of the cover plate, the second stop surface is formed by the pit bottom surface of the pit, and the pressing boss is convexly arranged on the pit bottom surface of the pit.

[0015] The beneficial effect of the above technical solution is that: by setting the pit, the second stop surface is formed by utilizing the bottom surface of the pit, and the top pressure boss is convexly arranged on the bottom surface of the pit, the structure is simple, and the processing and manufacturing of the cover plate is convenient.

[0016] Furthermore, the bottom wall of the embedding groove contacts the U-shaped section to support the lead frame.

[0017] The beneficial effect of the above technical solution is that the embedding groove can support the lead frame, which is convenient for the installation of the lead frame and the limiting of the downward movement of the lead frame.

[0018] Furthermore, a plurality of positioning grooves are provided on the bottom plate, and the plurality of positioning grooves are arranged in an array with at least two rows and at least two columns, and the placement holes on the interlayer and the first stop surface on the cover plate are provided in one-to-one correspondence with the positioning grooves.

[0019] The beneficial effect of the above technical solution is that it can be brazed in batches, thereby improving production efficiency.

[0020] Furthermore, a separation protrusion for separating two adjacent columns or two adjacent rows of lead frames is provided at the bottom of the cover plate.

[0021] The beneficial effect of the above technical solution is that the separated protrusions can further limit the translation of the lead frame and improve the limiting effect on the one hand, and form a counterweight structure on the other hand to increase the weight of the cover plate and improve the blocking effect.

[0022] Furthermore, a counterweight structure is provided on the cover plate.

[0023] The beneficial effect of the above technical solution is that the counterweight structure can increase the weight of the cover plate and achieve a better blocking effect.

[0024] Furthermore, the counterweight structure is a thickened frame arranged on the periphery of the cover plate.

[0025] The beneficial effects of the above technical solution are: simple structure and convenient processing and manufacturing of the cover plate.

[0026] Furthermore, the side walls around the positioning groove are all inclined side walls arranged obliquely to guide the insertion of the cuttable frame.

[0027] The beneficial effects of the above technical solution are: facilitating the installation of the fellable frame and improving assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural diagram of a dual in-line ceramic tube shell in the prior art;

[0029] Figure 2 The structure diagram of a dual in-line ceramic tube package in the prior art (with lead frame);

[0030] Figure 3 The structure diagram of the bottom plate of the fixture for brazing the dual in-line ceramic shell of the present invention;

[0031] Figure 4 Load for the kovable frame Figure 3 The structural diagram behind the bottom plate shown;

[0032] Figure 5 It is a structural diagram of the interlayer of the fixture for brazing the dual in-line ceramic shell of the present invention;

[0033] Figure 6 for Figure 5 A structural diagram of the interlayer after it is placed on the bottom plate;

[0034] Figure 7 Ceramic body, solder tabs and leads are installed together Figure 6 The structure diagram after the interlayer shown;

[0035] Figure 8 The structural diagram of the cover plate of the fixture for brazing the dual in-line ceramic shell of the present invention;

[0036] Fig. 9 for Figure 8 The cover shown is placed on Figure 7 The structural diagram after the interlayer shown;

[0037] Fig.10 It is a partial cross-sectional view of the fixture for brazing the dual in-line ceramic shell of the present invention.

[0038] In the figure: 10, ceramic body; 20, cuttable frame; 30, lead; 31, welding foot; 40, lead frame; 41, direct connection section; 42, U-shaped section; 50, welding piece; 1, bottom plate; 1-1, positioning groove; 2, interlayer; 2-1, groove; 2-2, placement hole; 2-3, positioning protrusion; 2-4, embedded groove; 3, cover plate; 3-1, top pressure boss; 3-2, pit; 3-3, separation protrusion. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0041] It should be noted that relational terms such as "first" and "second" that may appear are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, terms such as "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by a sentence such as "comprises a..." does not exclude the existence of other identical elements in the process, method, article or device that includes the element.

[0042] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0043] An embodiment of the dual in-line ceramic shell brazing fixture of the present invention:

[0044] like Fig. 9 As shown, the dual in-line ceramic shell brazing fixture includes a bottom plate 1, an interlayer 2 and a cover plate 3 arranged in sequence from bottom to top. Figure 3 and Figure 4 As shown, the base plate 1 is provided with a positioning groove 1-1 for placing the fellable frame 20 and positioning the periphery of the fellable frame 20. The side walls of the positioning groove 1-1 are all inclined side walls arranged obliquely to guide the insertion of the fellable frame 20. Therefore, during installation, it is only necessary to place the fellable frame 20 near the notch of the positioning groove 1-1 and gently push the fellable frame 20 to slide it into the positioning groove 1-1. The installation is relatively convenient and the assembly efficiency can be improved.

[0045] like Figure 5 and Figure 6 As shown, the interlayer 2 is used to be placed on the bottom plate 1 after the kovable frame 20 is installed. The interlayer 2 is provided with a relatively large groove 2-1. Figure 7As shown, a placement hole 2-2 is provided in the groove 2-1 for placing the pre-assembled ceramic body 10, welding sheet 50 and lead 30. The placement hole 2-2 passes through the interlayer 2 vertically and corresponds to the positioning groove 1-1 on the bottom plate 1 vertically, so that the front side of the ceramic body 10 can be reliably in contact with the cuttable frame 20, and then the cuttable frame 20 and the ceramic body 10 can be fixed by brazing.

[0046] The hole wall of the placement hole 2-2 is used to limit the horizontal movement of the ceramic body 10 and the front-to-back movement of the lead 30. The hole wall on the opposite side of the placement hole 2-2 is provided with a positioning protrusion 2-3 for extending between two adjacent left and right leads 30. Specifically, since the welding foot 31 is wider, the positioning protrusion 2-3 extends between two adjacent welding feet 31, and there are multiple positioning protrusions 2-3 on the hole wall on one side of the placement hole 2-2, which can extend into the gap between multiple adjacent welding feet 31 in a row, so as to achieve better positioning of the lead 30 and prevent the lead 30 from moving left and right. At the same time, the groove 2-1 is also provided with embedded grooves 2-4 on the left and right sides of the placement hole 2-2, and the left and right U-shaped sections 42 of the lead frame 40 are respectively embedded in the embedded grooves 2-4, and together with the positioning protrusions 2-3, they jointly limit the left and right movement of the lead 30. Furthermore, the bottom wall of the embedding groove 2 - 4 contacts the U-shaped section 42 , so as to support the lead frame 40 , facilitate the installation of the lead frame 40 and limit the downward movement of the lead frame 40 .

[0047] like Figure 8 , Fig. 9 and Fig.10 As shown, the cover plate 3 is placed on the interlayer 2, and a pit 3-2 is provided at the bottom of the cover plate 3. A top pressing boss 3-1 is convexly provided on the bottom surface of the pit 3-2. The bottom surface of the top pressing boss 3-1 constitutes a first stop surface for cooperating with the back stop of the ceramic body 10. After the cover plate 3 is installed, the first stop surface is actually pressed on the back of the ceramic body 10, which can limit the upward movement of the ceramic body 10. At the same time, the bottom surface of the pit 3-2 forms a second stop surface for cooperating with the front and rear direct connection sections 41 of the lead frame 40. The second stop surface contacts the direct connection section 41 after the cover plate 3 is installed, and can limit the upward movement of the lead frame 40. In this way, the ceramic body 10 and the lead frame 40 are fully limited, and it is prevented that the ceramic body 10 and the lead frame 40 move upward after thermal expansion, causing the welding foot 31 of the lead 30 to be misaligned with the metal printed coating on the side of the ceramic body 10, thereby avoiding the problem of crooked welding, and at the same time, it is prevented that the bottom of the ceramic body 10 cannot reliably contact the ferrite frame 20 after moving upward, resulting in empty welding, thereby improving the yield rate.

[0048] In order to improve the blocking effect, a counterweight structure is provided on the cover plate 3. The counterweight structure in this embodiment is a thickened frame provided on the periphery of the cover plate 3. It has a simple structure and is convenient for processing and manufacturing the cover plate 3. In addition, in this embodiment, there are multiple positioning grooves 1-1 on the bottom plate 1. The multiple positioning grooves 1-1 are arranged in an array with at least two rows and at least two columns. The placement holes 2-2 on the interlayer 2 and the top pressing bosses 3-1 on the cover plate 3 are all provided in a one-to-one correspondence with the positioning grooves 1-1, so that batch brazing can be performed to improve production efficiency. It should be noted that Figures 3 to 10 The fixture structure shown in the figure is only a partial structure, not a complete structure. Figure 8 and Fig. 9 As shown, a separating protrusion 3-3 for separating two adjacent columns of lead frames 40 is provided on the bottom surface of the pit 3-2. The separating protrusion 3-3 can further limit the translation of the lead frame 40 and improve the limiting effect on the one hand, and form a counterweight structure on the other hand to increase the weight of the cover plate 3 and improve the blocking effect.

[0049] In addition, the bottom plate 1 and the interlayer 2, and the interlayer 2 and the cover plate 3 are positioned and matched by bosses and slots (not shown in the figure) to ensure the position accuracy between the bottom plate 1, the interlayer 2 and the cover plate 3, and the bosses and slots are set at the edge to avoid affecting the setting of the limit structure and the installation of the product. In addition, the material of the bottom plate 1, the interlayer 2 and the cover plate 3 is graphene, which is the closest to the expansion coefficient of alumina, and graphene has good thermal conductivity, and the brazing effect is better.

[0050] The specific process of using the fixture for brazing a dual-row in-line ceramic shell is as follows: when assembling the ceramic shell before brazing, first weld or glue the welding piece 50 to the welding foot 31 of each column of leads 30. Of course, it can also be cut and formed as one piece, so that each column of leads 30 is connected together through a welding piece 50, and then the ceramic body 10 is installed between the two columns of leads 30. During the installation process, any lead in a column of leads can be pushed open, which can make the entire column of leads aside to facilitate the installation of the ceramic body 10, thereby completing the pre-installation between the ceramic body 10, the welding piece 50 and the leads 30.

[0051] During formal assembly, first install the foldable frame 20 into the positioning groove 1-1 of the bottom plate 1, as shown in FIG. Figure 4 Then the interlayer 2 is placed on the bottom plate 1, as shown. Figure 6 Then the pre-assembled ceramic body 10, solder sheet 50 and lead wire 30 are loaded into the placement hole 2-2 of the interlayer 2 from top to bottom. Of course, the pre-assembly operation process can be completed before or after the kovable frame 20 is loaded. After loading, as shown in FIG. Figure 7As shown, the placement hole 2-2 can limit the horizontal movement of the ceramic body 10 and the front-to-back movement of the lead 30. The positioning protrusion 2-3 on the hole wall of the placement hole 2-2 is inserted between the welding feet 31 of two adjacent leads 30 to limit the left-right movement of the lead 30. At the same time, the left and right U-shaped sections 42 of the lead frame 40 are embedded in the embedded groove 2-4, and the embedded groove 2-4 supports and limits the left-right position of the lead frame 40 and the lead 30. Then the cover plate 3 is placed on the interlayer 2, as shown in FIG. Fig. 9 and Fig.10 As shown, the top pressing boss 3-1 on the cover plate 3 presses the back of the ceramic body 10 to limit the upward movement of the ceramic body 10, and the bottom surface of the pit 3-2 on the cover plate 3 contacts the direct connection section 41 to limit the upward movement of the lead frame 40. At this time, the assembly of the fixture and the installation of the product are completed, and finally the fixture is placed in the brazing furnace.

[0052] The clamp in the present invention adopts three layers, which can realize the limitation of each component such as the ceramic body 10, the ferrule frame 20, the lead 30, the lead frame 40, etc. It is easy to assemble, can ensure the brazing effect, and improve the yield rate. At the same time, each row of leads 30 is fixed to the welding piece 50, which greatly reduces the difficulty of loading the ceramic body 10, improves the assembly efficiency, and also improves the position accuracy of the welding piece, which can avoid the different solder fullness corresponding to each welding foot 31 after brazing, thereby improving the yield rate. In addition, by using a cover plate directly covering the interlayer, each ceramic body 10 can be pressed tightly, without the need to install plugs one by one as in the prior art, which greatly improves the installation efficiency and ensures the assembly effect.

[0053] In other embodiments of the fixture for brazing a dual in-line ceramic tube shell: if the welding foot of the lead is as wide as the lead, then the positioning protrusion can be extended between two adjacent leads and does not need to be at the position of the welding foot.

[0054] In other embodiments of the fixture for brazing a dual-in-line ceramic tube shell: only an embedding groove may be provided on the interlayer without a positioning protrusion, in which case the left and right U-shaped sections of the lead frame are respectively embedded in the embedding groove and contact the bottom wall of the embedding groove to support the lead and limit the left and right movement of the lead; or only a positioning protrusion may be provided on the interlayer without an embedding groove, in which case the positioning protrusion extends between the left and right adjacent leads to limit the left and right movement of the lead, and in order to facilitate the lead frame to form a whole and facilitate the installation of the ceramic body, the lead frame still includes the U-shaped section. However, the U-shaped section does not contact the interlayer. Since the placement hole is a through hole, the size of the through hole is larger than the size of the positioning groove, so that the end of the lead can be supported on the upper end surface of the bottom plate, thereby limiting the downward movement of the lead; or, although the interlayer is provided with a positioning protrusion and an embedding groove, and the positioning protrusion extends between two adjacent leads on the left and right to limit the left and right movement of the lead, and at the same time, the left and right U-shaped sections of the lead frame are respectively embedded in the embedding grooves, the U-shaped sections do not contact the bottom wall of the embedding groove, and the embedding groove only serves to limit the left and right movement of the lead. At this time, the support of the lead can still utilize the upper end surface of the bottom plate.

[0055] In other embodiments of the fixture for brazing a dual in-line ceramic shell, the side walls around the positioning groove may also be straight side walls.

[0056] In other embodiments of the fixture for brazing a dual in-line ceramic shell, the counterweight structure may also be a wall thickening portion arranged at intervals, and of course, the counterweight structure may not be arranged on the cover plate.

[0057] In other embodiments of the fixture for brazing a dual in-line ceramic tube shell, the separating protrusions may separate two adjacent rows of lead frames, and of course, the separating protrusions may not be provided on the cover plate.

[0058] In other embodiments of the fixture for brazing a dual in-line ceramic shell: the number and arrangement of the positioning grooves on the bottom plate, the placement holes on the interlayer, and the top pressing bosses on the cover plate can be adjusted according to actual needs.

[0059] In other embodiments of the fixture for brazing a dual in-line ceramic shell: no pit is provided at the bottom of the cover plate, the second stop surface is directly formed by the bottom surface of the cover plate, and the pressing boss is directly protruded on the bottom surface of the cover plate.

[0060] In other embodiments of the fixture for brazing a dual in-line ceramic tube shell: the second stop surface may also be arranged to protrude relative to the bottom surface of the cover plate, for example, formed by a protruding end surface.

[0061] In other embodiments of the fixture for brazing a dual in-line ceramic shell, the pressing bosses on the cover plate may not be independently arranged, but may be strip bosses arranged in a row.

[0062] In other embodiments of the dual in-line ceramic shell brazing fixture: the bottom of the cover plate can be connected to a push rod, and the first stop surface is composed of the end surface of the push rod. Of course, the bottom of the cover plate can also be connected to a cylinder, and the first stop surface is composed of the annular end surface of the cylinder.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A fixture for brazing a dual in-line ceramic shell, characterized in that: The invention comprises a bottom plate, an interlayer and a cover plate which are arranged in sequence from bottom to top. The bottom plate is provided with a positioning groove for placing and positioning a kovable frame. The interlayer is provided with a placement hole for placing a ceramic body, a welding piece and a lead. The placement hole passes through the interlayer up and down and corresponds to the positioning groove on the bottom plate up and down, so that the front of the ceramic body can contact the kovable frame. The hole wall of the placement hole is used to limit the horizontal movement of the ceramic body and the front and back movement of the lead. The hole wall of the placement hole is provided with a positioning protrusion for extending between two adjacent left and right leads. The interlayer is provided with an embedding groove for embedding two left and right U-shaped sections of the lead frame to limit the left and right movement of the lead. The bottom wall of the groove contacts the U-shaped section to support the lead frame; the bottom of the cover plate is provided with a first stop surface for cooperating with the back stop of the ceramic body and a second stop surface for cooperating with the front and rear direct connection sections of the lead frame to limit the upward movement of the ceramic body and the lead frame, and a plurality of positioning grooves are arranged on the bottom plate, and the plurality of positioning grooves are arranged in an array with at least two rows and at least two columns. The bottom of the cover plate is provided with a separating protrusion for separating two adjacent columns or two adjacent rows of lead frames, and the separating protrusion can limit the translation of the lead frame; when assembling the ceramic tube shell before brazing, the welding piece is first welded or bonded to the welding foot of each column of leads.

2. The dual in-line ceramic shell brazing fixture according to claim 1, characterized in that: A pressing boss is provided at the bottom of the cover plate, and the first stop surface is formed by the bottom surface of the pressing boss.

3. The dual in-line ceramic shell brazing fixture according to claim 2, characterized in that: A pit is arranged at the bottom of the cover plate, the second stop surface is formed by the pit bottom surface of the pit, and the pressing boss is convexly arranged on the pit bottom surface of the pit.

4. The dual in-line ceramic shell brazing fixture according to any one of claims 1 to 3, characterized in that: The placement holes on the interlayer and the first stop surface on the cover plate are arranged in one-to-one correspondence with the positioning grooves.

5. The dual in-line ceramic shell brazing fixture according to any one of claims 1 to 3, characterized in that: A counterweight structure is arranged on the cover plate.

6. The dual in-line ceramic shell brazing fixture according to claim 5, characterized in that: The counterweight structure is a thickened frame arranged on the periphery of the cover plate.

7. The dual in-line ceramic shell brazing fixture according to any one of claims 1 to 3, characterized in that: The side walls around the positioning groove are all inclined side walls arranged obliquely to guide the insertion of the cuttable frame.

Images