Vacuum carbonic acid furnace lifting mechanism

Abstract

The utility model discloses a vacuum formic acid furnace lifting mechanism, including lifting power component and a plurality of lifting rod, and the lifting rod includes the rod body, the rod seat, and the rod body is set through the rod seat, and the rod body includes the upper rod of coaxial setting, lower rod, and the end face of upper rod, lower rod connection side is equipped with the screw hole, stud respectively, the outer periphery of upper rod is equipped with upper convex ring, and the outer periphery of lower rod is equipped with lower convex ring, and is equipped with the spacer between upper convex ring, lower convex ring, and is equipped with upper sealing ring group between upper convex ring, spacer, and is equipped with lower sealing ring group between lower convex ring, spacer. The utility model designs the structure of upper rod, lower rod splicing for the rod body, and the end face of upper rod, lower rod connecting position does not contact, and only connects through the screw hole, stud, and the heat in the cavity main body is more difficult to pass through the rod body and is delivered to the cavity main body outside, simultaneously, through the connecting depth of adjusting screw post and screw hole, can adjust the clamping intensity of upper convex ring, lower convex ring to upper sealing ring group, lower sealing ring group, and then adjust the sealing degree between the rod body and the rod seat.

Description

Technical Field

[0001] This utility model relates to the field of welding equipment technology, specifically to a lifting mechanism for a vacuum formic acid furnace. Background Technology

[0002] A vacuum formic acid furnace is a specialized welding device that combines a vacuum environment with formic acid gas. It is widely used in power semiconductors, IGBT modules, LED packaging and other fields. Its core principle is to reduce oxidation reaction through a vacuum environment and use formic acid as a reducing agent to remove oxides from the welding surface, thereby achieving high-quality welding.

[0003] The vacuum formic acid furnace includes a main chamber, the interior of which is isolated from the external environment to create a vacuum environment. The main chamber houses a heating mechanism and a conveying mechanism. It has an inlet and an outlet, and a lifting mechanism at its bottom. During operation, the lifting mechanism raises the conveying mechanism. The conveying mechanism receives a fixture containing the product from the inlet and moves it above the heating mechanism. The lifting mechanism then lowers the conveying mechanism, allowing the fixture to contact the heating mechanism and complete the product heating and welding. After welding, the lifting mechanism raises the conveying mechanism again, and the conveying mechanism delivers the fixture and product out of the main chamber through the outlet.

[0004] The existing lifting mechanism of the vacuum formic acid furnace has the following defects:

[0005] 1. In order to cooperate with the conveying mechanism, the upper end of the lifting rod of the lifting mechanism must extend into the cavity body. The existing lifting mechanism uses a single metal rod, and the heat inside the cavity body can easily be transferred to the outside of the cavity body through the rod.

[0006] 2. The outer side of the lifting rod is equipped with a rod seat for guidance. The fit gap between the inner circumferential surface of the rod seat and the outer circumferential surface of the rod is sealed by ordinary O-rings. The sealing degree of the same type of O-ring is fixed and cannot be adjusted independently. When the vacuum formic acid furnace produces different products and it is necessary to adjust the vacuum degree inside the main body of the chamber, it can only be matched by replacing O-rings with different sealing degrees, which is a rather cumbersome operation. Utility Model Content

[0007] The purpose of this utility model is to provide a lifting mechanism for a vacuum formic acid furnace.

[0008] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0009] A lifting mechanism for a vacuum formic acid furnace includes a lifting power component and several lifting rods. Each lifting rod includes a rod body and a rod seat. The rod seat is fixed to the bottom of the cavity body of the vacuum formic acid furnace. The rod body passes through the rod seat. The rod body includes an upper rod and a lower rod arranged coaxially. The end faces of the upper rod and the lower rod on the connecting side are respectively provided with screw holes and studs to connect the upper rod and the lower rod through the screw holes and studs. There is a gap between the end faces of the upper rod and the lower rod on the connecting side.

[0010] The upper rod has an upper convex ring on its outer periphery, and the lower rod has a lower convex ring on its outer periphery. A spacer is provided between the upper and lower convex rings. An upper sealing ring group is provided between the upper convex ring and the spacer, and a lower sealing ring group is provided between the lower convex ring and the spacer. This allows the clamping force of the upper and lower convex rings on the upper and lower sealing ring groups to be adjusted by adjusting the connection depth between the stud and the screw hole.

[0011] As a further improvement of this utility model, the spacer ring is made of hard metal, and the gap between the spacer ring and the upper rod and the lower rod is aligned.

[0012] As a further improvement of this utility model, both the upper and lower sealing ring assemblies include O-rings and star-shaped sealing rings.

[0013] As a further improvement of this utility model, a metal washer is provided between the upper sealing ring assembly and the upper convex ring and spacer ring.

[0014] As a further improvement of this utility model, a metal washer is provided between the lower sealing ring assembly and the lower convex ring and spacer ring.

[0015] As a further improvement of this utility model, the upper rod is made of metal and the lower rod is made of plastic.

[0016] As a further improvement of the present invention, it also includes a lifting platform, wherein the number of lifting rods is 4 sets, and the lower rods of the 4 sets of lifting rods are respectively clamped and fixed at the 4 corners of the lifting platform;

[0017] The middle part of the lifting platform is connected to the lifting power component via a transmission connection.

[0018] Compared with the prior art, the technical advantages of this utility model are as follows:

[0019] This utility model designs the rod body as a structure of upper and lower rods spliced ​​together. The end faces of the upper and lower rods at the connection position do not contact each other, and there is a gap between the end faces of the upper and lower rods. The air layer formed by the gap has low heat conduction efficiency. At the same time, the connection is made by screw holes and studs. The diameter of the studs is smaller than that of the upper and lower rods, which can also reduce the heat conduction efficiency. It is even more difficult for the heat inside the cavity to be transferred to the outside of the cavity through the rod body.

[0020] By adjusting the connection depth between the stud and the threaded hole, the clamping force of the upper and lower convex rings on the upper and lower sealing ring sets can be adjusted. The deeper the stud is screwed into the threaded hole, the closer the upper and lower convex rings are, the greater the clamping force of the upper and lower convex rings on the upper and lower sealing ring sets, and the greater the deformation of the upper and lower sealing ring sets (the upper and lower sealing ring sets are flattened, and the radial dimension becomes larger). The sealing effect of the upper and lower sealing ring sets on the mating surfaces of the rod body and rod seat is better, and the sealing degree between the rod body and rod seat can be adjusted relatively easily without replacing the upper and lower sealing ring sets. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of a vacuum formic acid furnace lifting mechanism and cavity body according to an embodiment of this utility model;

[0022] Figure 2 This is a front view structural diagram of a vacuum formic acid furnace lifting mechanism and cavity body according to an embodiment of this utility model;

[0023] Figure 3 yes Figure 2 Schematic diagram of the cross-sectional structure along the AA direction;

[0024] Figure 4 This is a bottom view of the lifting mechanism and cavity body of a vacuum formic acid furnace according to an embodiment of the present invention.

[0025] Figure 5 This is a cross-sectional structural schematic diagram of the lifting rod in the embodiment of this utility model. Detailed Implementation

[0026] The present invention will now be described in detail with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are included within the protection scope of the present invention.

[0027] Please see Figures 1 to 5 A lifting mechanism for a vacuum formic acid furnace includes a lifting power component 1 and several lifting rods. Each lifting rod includes a rod body 2 and a rod seat 3. The rod seat 3 is fixed to the bottom of the cavity body 4 of the vacuum formic acid furnace (an O-ring is also provided on the mating surface between the rod seat 3 and the cavity body 4). The rod body 2 passes through the rod seat 3. The rod body 2 includes an upper rod 21 and a lower rod 22 arranged coaxially. The end faces of the upper rod 21 and the lower rod 22 are respectively provided with screw holes 5 and studs 6 to connect the upper rod 21 and the lower rod 22 through the screw holes 5 and studs 6. There is a gap 7 between the end faces of the upper rod 21 and the lower rod 22 on the connecting side.

[0028] The upper rod 21 is provided with an upper convex ring 8 on its outer periphery, and the lower rod 22 is provided with a lower convex ring 9 on its outer periphery. A spacer 10 is provided between the upper convex ring 8 and the lower convex ring 9. An upper sealing ring group 11 is provided between the upper convex ring 8 and the spacer 10, and a lower sealing ring group 12 is provided between the lower convex ring 9 and the spacer 10. This allows the clamping force of the upper convex ring 8 and the lower convex ring 9 on the upper sealing ring group 11 and the lower sealing ring group 12 to be adjusted by adjusting the connection depth between the stud 6 and the screw hole 5.

[0029] In this embodiment, there are 4 sets of lifting rods. The 4 sets of lifting rods cooperate with the four corners of the conveying mechanism 16. Specifically, the top of the lifting rod 2 extends into the cavity body 4 and presses against the bottom of the four corners of the conveying mechanism 16. When the rod 2 rises and falls, it drives the conveying mechanism 16 to rise and fall.

[0030] In this embodiment, the lifting power component 1 is a cylinder. The cylinder is connected to the lower rod 22 via the lifting platform 13. When the cylinder drives the lifting platform 13 to move, the lifting platform 13 drives the rod 2 to move up and down.

[0031] In this embodiment, the screw hole 5 is formed on the lower end face of the upper rod 21, and the stud 6 is protruding on the upper end face of the lower rod 22.

[0032] In other embodiments, the screw hole 5 may also be formed on the upper end face of the lower rod 22, and correspondingly, the stud 6 is protruding on the lower end face of the upper rod 21.

[0033] When the lower rod 22 is rotated, increasing the depth to which the stud 6 is screwed into the threaded hole 5, the upper and lower convex rings move closer together. During this process, the upper convex ring 8 and the spacer 10 flatten the upper sealing ring assembly 11, making its diameter larger. This results in a greater force exerted by the upper sealing ring assembly 11 against the inner wall of the rod seat 3 and the outer wall of the rod body 2, leading to a better sealing effect. Similarly, the lower convex ring 9 and the spacer 10 flatten the lower sealing ring assembly 12, making its diameter larger. This also results in a greater force exerted by the lower sealing ring assembly 12 against the inner wall of the rod seat 3 and the outer wall of the rod body 2, further enhancing the sealing effect. The sealing effect inside the lifting rod can be adjusted by rotating the stud 6.

[0034] It should be noted that after the upper and lower rods are connected, the upper and lower sealing ring assemblies and the spacer 10 are clamped and fixed between the upper and lower convex rings, and move up and down together with the upper and lower rods. When selecting the position of the upper and lower convex rings, the lifting stroke of the rod body 2 must be considered to prevent the upper and lower sealing ring assemblies from coming off the rod seat 3 during the lifting process.

[0035] Furthermore, the spacer ring 10 is made of hard metal, and the gap 7 between the spacer ring 10 and the upper rod 21 and the lower rod 22 is aligned.

[0036] During the process of adjusting the connection depth between the stud 6 and the screw hole 5, and thus adjusting the clamping force of the upper convex ring 8 and the lower convex ring 9 on the upper sealing ring group 11 and the lower sealing ring group 12, the gap 7 between the connecting end faces of the upper rod 21 and the lower rod 22 never exceeds the range of the spacer 10. That is, the gap 7 is always located between the upper and lower sealing ring groups, avoiding the phenomenon that the upper and lower sealing ring groups are misaligned with the gap 7 during the adjustment process, and the sealing ring enters the gap 7 and loses its sealing effect.

[0037] Furthermore, both the upper and lower sealing ring assemblies include O-rings and star-shaped sealing rings.

[0038] Furthermore, a metal washer 14 is provided between the upper sealing ring assembly 11 and the upper convex ring 8 and the spacer 10.

[0039] Furthermore, a metal washer 14 is provided between the lower sealing ring assembly 12 and the lower convex ring 9 and the spacer 10.

[0040] Furthermore, the upper rod 21 is made of metal, and the lower rod 22 is made of plastic.

[0041] Preferably, the upper rod 21 and the lower rod 22 are made of two different materials. The upper rod 21, which extends into the cavity body 4, needs to be made of a metal with better temperature resistance. The lower rod 22 is only connected to the bottom of the upper rod 21 via a stud 6, so the temperature resistance requirement for the lower rod 22 is relatively lower; it can be made of heat-resistant plastic. Plastic has lower thermal conductivity than metal, which can further suppress heat transfer to the outside of the cavity body 4.

[0042] Furthermore, it also includes a lifting platform 13, and the number of lifting rods is 4 sets, with the lower rods 22 of the 4 sets of lifting rods being clamped and fixed at the 4 corners of the lifting platform 13 respectively;

[0043] The middle part of the lifting platform 13 is connected to the lifting power component 1 via a transmission.

[0044] The lifting platform 13 has C-shaped holes 15 at its four corners. The lower rod 22 passes through the C-shaped holes 15. The clamping / unclamping state of the lower rod 22 can be adjusted by the first bolt 18 passing through the opening of the C-shaped hole 15.

[0045] Adjustment seats 17 are provided at the four corners of the lifting platform 13. The upper end of the adjustment seat 17 is fastened to the lifting platform 13, and the bottom of the adjustment seat 17 is threaded with a second bolt 19. The bottom surface of the lower rod 22 is pressed on the second bolt 19. The height of the rod 2 can be adjusted by rotating the second bolt 19.

[0046] During the debugging process, the first bolt 18 can be loosened, and the tops of the four rods 2 can be adjusted to the same horizontal level by rotating the second bolt 19. Then, the first bolt 18 can be tightened to fix the position of the rods 2. After leveling, the tops of the four rods 2 will be at the same horizontal level during the operation of the lifting mechanism, thus ensuring the smooth lifting of the conveying mechanism 16.

[0047] Compared with the prior art, the technical advantages of this utility model are as follows:

[0048] In this invention, the rod 2 is designed as an upper rod 21 and a lower rod 22 spliced ​​together. The end faces of the upper rod 21 and the lower rod 22 do not contact each other at the connection position. There is a gap 7 between the end faces of the upper rod 21 and the lower rod 22. The air layer formed by the gap 7 has low heat conduction efficiency. At the same time, it is connected by a screw hole 5 and a stud 6. The diameter of the stud 6 is smaller than that of the upper and lower rods, which can also reduce the heat conduction efficiency. It is even more difficult for the heat inside the cavity body 4 to be transferred to the outside of the cavity body 4 through the rod 2.

[0049] By adjusting the connection depth between the stud 6 and the screw hole 5, the clamping force of the upper convex ring 8 and the lower convex ring 9 on the upper sealing ring group 11 and the lower sealing ring group 12 can be adjusted. The deeper the stud 6 is screwed into the screw hole 5, the closer the upper and lower convex rings are, the greater the clamping force of the upper and lower convex rings on the upper and lower sealing ring groups, and the greater the deformation of the upper and lower sealing ring groups (the upper and lower sealing ring groups are flattened, and the radial dimension becomes larger). The sealing effect of the upper and lower sealing ring groups on the mating surfaces of the rod body 2 and the rod seat 3 is better, and the sealing degree between the rod body 2 and the rod seat 3 can be adjusted more easily without replacing the upper and lower sealing ring groups.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of this utility model.

Claims

1. A lifting mechanism for a vacuum formic acid furnace, comprising a lifting power component and a plurality of lifting rods, wherein each lifting rod includes a rod body and a rod seat, the rod seat being fixedly disposed at the bottom of the cavity body of the vacuum formic acid furnace, and the rod body passing through the rod seat, characterized in that, The rod body includes an upper rod and a lower rod arranged coaxially. The end faces of the upper rod and the lower rod on the connecting side are respectively provided with screw holes and studs, so as to connect the upper rod and the lower rod through the screw holes and studs. There is a gap between the end faces of the upper rod and the lower rod on the connecting side. The upper rod has an upper convex ring on its outer periphery, and the lower rod has a lower convex ring on its outer periphery. A spacer is provided between the upper and lower convex rings. An upper sealing ring group is provided between the upper convex ring and the spacer, and a lower sealing ring group is provided between the lower convex ring and the spacer. This allows the clamping force of the upper and lower convex rings on the upper and lower sealing ring groups to be adjusted by adjusting the connection depth between the stud and the screw hole.

2. The vacuum formic acid furnace lifting mechanism according to claim 1, characterized in that, The spacer ring is made of hard metal, and the spacer ring is aligned with the gap between it and the upper and lower rods.

3. The vacuum formic acid furnace lifting mechanism according to claim 1, characterized in that, Both the upper and lower sealing ring assemblies include O-rings and star-shaped sealing rings.

4. The vacuum formic acid furnace lifting mechanism according to claim 1, characterized in that, Metal washers are provided between the upper sealing ring assembly and the upper convex ring and spacer ring.

5. The vacuum formic acid furnace lifting mechanism according to claim 1, characterized in that, Metal washers are provided between the lower sealing ring assembly and the lower convex ring and spacer ring.

6. The vacuum formic acid furnace lifting mechanism according to claim 1, characterized in that, The upper rod is made of metal, and the lower rod is made of plastic.

7. The vacuum formic acid furnace lifting mechanism according to claim 1, characterized in that, It also includes a lifting platform, and the number of lifting rods is 4 sets, with the lower rods of the 4 sets of lifting rods being clamped and fixed at the 4 corners of the lifting platform respectively; The middle part of the lifting platform is connected to the lifting power component via a transmission connection.

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