Dynamic sealing structure of transmission shaft of vacuum reflow soldering equipment

Abstract

The utility model discloses a transmission shaft dynamic sealing structure of vacuum reflow soldering equipment, which comprises a shell and an end cover, a mounting cavity is defined by the shell and the end cover, and a static sealing component, a dynamic sealing component and a pressure regulating mechanism are arranged in the mounting cavity; the pressure adjusting mechanism comprises a pressure adjusting block, a pressing plate, a spring and a pressure adjusting bolt, the pressure adjusting block is detachably and fixedly connected with the transmission shaft, the pressing plate is arranged between the dynamic sealing component and the pressure adjusting block, and the pressure adjusting bolt is in threaded connection with the pressure adjusting block and abuts against the pressing plate so that the axial position of the pressing plate can be adjusted through the pressure adjusting bolt. And the sealing pressure on the matching surfaces of the dynamic sealing component and the static sealing component is adjusted through the spring. The pressure regulating mechanism is arranged, when the matching surfaces of the dynamic sealing component and the static sealing component are slightly abraded and the sealing pressure is insufficient, the pressure regulating mechanism can be used for regulating and compensating, so that the replacement frequency of the dynamic sealing component and the static sealing component can be reduced, and the use and maintenance cost is further reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum reflow soldering equipment manufacturing, in particular to a transmission shaft dynamic sealing structure of vacuum reflow soldering equipment. Background Art

[0002] The vacuum welding chamber is an important part of the vacuum reflow soldering equipment. When the power of the external power source (such as a motor) of the vacuum welding chamber is transmitted to the inside of the vacuum welding chamber, it is necessary to use a transmission shaft that runs through the vacuum welding chamber. The sealing structure of the transmission shaft will directly affect the vacuum degree of the vacuum welding chamber.

[0003] Since the transmission shaft rotates during operation, a dynamic sealing structure is required at the transmission shaft. The sealing pressure of the existing dynamic sealing structure cannot be adjusted. After a period of use, the sealing component becomes worn and the sealing effect weakens. The sealing component can only be replaced. The replacement frequency of the sealing component is high, which increases the use and maintenance costs.

[0004] Furthermore, the existing installation structure of the dynamic seal structure and the transmission shaft is relatively complex, and the process of disassembling and assembling the dynamic seal structure is relatively cumbersome. Utility Model Content

[0005] The utility model aims to provide a dynamic sealing structure for a transmission shaft of vacuum reflow soldering equipment.

[0006] In order to achieve the above utility model purpose, the utility model adopts the following technical solutions:

[0007] A dynamic sealing structure for a transmission shaft of a vacuum reflow soldering device comprises a housing and an end cover, wherein the housing and the end cover together form an installation cavity, wherein a static sealing component, a dynamic sealing component and a pressure regulating mechanism are arranged in the installation cavity;

[0008] The static sealing component comprises a static base, a gap exists between the inner periphery of the static base and the transmission shaft, a first sealing ring is arranged on the outer periphery of the static base, and the first sealing ring is in pressing contact with the inner surface of the housing;

[0009] The dynamic sealing component comprises a dynamic base, the dynamic base is connected to the transmission shaft in a rotationally limited manner, a second sealing ring is arranged on the inner periphery of the dynamic base, and the second sealing ring is in pressure contact with the outer surface of the transmission shaft;

[0010] The pressure regulating mechanism includes a pressure regulating block, a pressure plate, a spring, and a pressure regulating bolt. The pressure regulating block is detachably fixedly connected to the transmission shaft. The pressure plate is arranged between the dynamic sealing component and the pressure regulating block. The pressure regulating bolt is threadedly connected to the pressure regulating block and pressed against the pressure plate, so that the axial position of the pressure plate can be adjusted by the pressure regulating bolt, and then the sealing pressure on the mating surfaces of the dynamic sealing component and the static sealing component can be adjusted by the spring.

[0011] As a further improved technical solution of the utility model, there are at least three pressure regulating bolts, and the pressure regulating bolts are evenly distributed in the circumferential direction of the pressure regulating block.

[0012] As a further improved technical solution of the utility model, the moving base and the pressure plate are clamped and sleeved on the transmission shaft and are rotationally limitedly connected to the transmission shaft.

[0013] As a further improved technical solution of the utility model, a groove is axially provided on the inner circumference of the moving base, a limit strip is protruded on the outer circumference of the transmission shaft, and the moving base is rotationally limitedly connected to the transmission shaft through the cooperation of the groove and the limit strip.

[0014] As a further improved technical solution of the utility model, a notch is provided on the pressure regulating block, and a fastening bolt is provided at the notch to detachably fix the pressure regulating block to the transmission shaft.

[0015] As a further improved technical solution of the utility model, a first bearing and a second bearing for supporting the transmission shaft are provided in the installation cavity.

[0016] As a further improved technical solution of the utility model, the end cover is detachably fixedly connected to the shell.

[0017] As a further improved technical solution of the utility model, the outer shell is provided with a third sealing ring for cooperating with the inner wall of the vacuum welding chamber.

[0018] As a further improved technical solution of the utility model, a coupling is provided at the end of the transmission shaft.

[0019] As a further improved technical solution of the utility model, the static matrix and the dynamic matrix are made of high temperature resistant ceramics.

[0020] Compared with the prior art, the technical effects of the utility model are:

[0021] The utility model is provided with a pressure regulating mechanism. When slight wear occurs on the mating surfaces of the dynamic sealing component and the static sealing component, resulting in insufficient sealing pressure, the pressure regulating mechanism can be used for adjustment and compensation, which can reduce the replacement frequency of the dynamic sealing component and the static sealing component, thereby reducing the use and maintenance costs.

[0022] At the same time, the installation structure of the utility model and the transmission shaft is relatively simple, and the disassembly and assembly process is relatively convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the installation state of a transmission shaft dynamic sealing structure of a vacuum reflow soldering equipment on a vacuum soldering chamber in an embodiment of the utility model;

[0024] Figure 2 It is a three-dimensional structural schematic diagram of a transmission shaft dynamic sealing structure of a vacuum reflow soldering device in an embodiment of the utility model;

[0025] Figure 3 It is a schematic diagram of the main structure of a transmission shaft dynamic sealing structure of a vacuum reflow soldering device in an embodiment of the utility model;

[0026] Figure 4 yes Figure 3 Schematic diagram of the cross-sectional structure along the AA direction;

[0027] Figure 5 It is a schematic diagram of the cross-sectional structure of a dynamic sealing component and a transmission shaft provided with grooves and limit strips;

[0028] Figure 6 It is a schematic diagram of the cross-sectional structure of the pressure regulating block. DETAILED DESCRIPTION

[0029] The present invention will be described in detail below in conjunction with the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional changes made by a person skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0030] See also Figures 1 to 4 A dynamic sealing structure 100 for a transmission shaft of a vacuum reflow soldering device comprises a housing 1 and an end cover 2. The end cover 2 is detachably fixed on the housing 1 by bolts. The housing 1 and the end cover 2 together form an installation cavity. A static sealing component, a dynamic sealing component and a pressure regulating mechanism are arranged in the installation cavity.

[0031] The static sealing component includes a static base 31 , a gap exists between the inner periphery of the static base 31 and the transmission shaft 4 , and a first sealing ring 32 is disposed on the outer periphery of the static base 31 , and the first sealing ring 32 is in pressure contact with the inner surface of the housing 1 .

[0032] The dynamic sealing component includes a dynamic base 51 , which is rotationally limitedly connected to the transmission shaft 4 (the dynamic base 51 can rotate with the transmission shaft 4 ), and a second sealing ring 52 is provided on the inner periphery of the dynamic base 51 , and the second sealing ring 52 is in pressure contact with the outer surface of the transmission shaft 4 .

[0033] The pressure regulating mechanism includes a pressure regulating block 61, a pressure plate 62, a spring 63, and a pressure regulating bolt 64. The pressure regulating block 61 is detachably fixedly connected to the transmission shaft 4. The pressure plate 62 is arranged between the dynamic sealing component and the pressure regulating block 61. The pressure regulating bolt 64 is threadedly connected to the pressure regulating block 61 and pressed against the pressure plate 62, so that the axial position of the pressure plate 62 can be adjusted by the pressure regulating bolt 64, and then the sealing pressure on the mating surfaces of the dynamic sealing component and the static sealing component can be adjusted by the spring 63.

[0034] It should be noted that the static base 31 , the dynamic base 51 , and the pressure plate 62 are all closed-loop structures coaxially arranged with the transmission shaft 4 .

[0035] The static sealing component does not rotate along with the transmission shaft 4 , while the dynamic sealing component, the pressure plate 62 , and the pressure regulating block 61 rotate along with the transmission shaft 4 .

[0036] The first sealing ring 32 is used for sealing between the static base 31 and the housing 1, and the second sealing ring 52 is used for sealing between the dynamic base 51 and the transmission shaft 4. The sealing between the dynamic base 51 and the static base 31 is achieved by tightly pressing the mating surfaces of the two.

[0037] The pressure regulating block 61 of the pressure regulating mechanism is locked and fixed on the transmission shaft 4 when in use. When the mating surfaces of the dynamic sealing component and the static sealing component are slightly worn (the static base 31 and the dynamic base 51 wear each other and become thinner), resulting in insufficient sealing pressure, the pressure regulating bolt 64 is rotated to push the pressure plate 62 toward the side of the static sealing component to increase the thrust applied by the spring 63 to the dynamic base 51, thereby compensating for the sealing pressure on the mating surfaces of the dynamic sealing component and the static sealing component. Therefore, it is not necessary to frequently replace the dynamic sealing component and the static sealing component.

[0038] When the dynamic sealing components and the static sealing components are worn out and need to be replaced, it is only necessary to remove the end cover 2 and the pressure regulating block 61 to carry out the replacement operation, and the disassembly and assembly process is relatively convenient.

[0039] A small hole 21 may be provided on the end cover 2 in alignment with the pressure regulating bolt 64. When pressure regulation is required, the end cover 2 does not need to be removed, and the pressure regulating bolt 64 can be directly rotated through the small hole 21 with a screwdriver.

[0040] Furthermore, there are at least three pressure regulating bolts 64, and the pressure regulating bolts 64 are evenly distributed around the pressure regulating block 61. The structure in which multiple pressure regulating bolts 64 are evenly distributed around the pressure regulating block 61 is beneficial to ensure uniform pressure around the mating surfaces of the dynamic base 51 and the static base 31 in the subsequent pressure adjustment process.

[0041] Furthermore, in this embodiment, the moving base 51 and the pressure plate 62 are clamped and sleeved on the transmission shaft 4 and are rotationally limitedly connected to the transmission shaft 4 .

[0042] It should be noted that the tightness of the dynamic sealing component and the pressure plate 62 should not affect the operation of the pressure regulating mechanism. Specifically, the friction between the pressure plate 62 and the transmission shaft 4 is smaller than the thrust of the pressure regulating bolt 64, and the friction between the dynamic sealing component and the transmission shaft 4 is smaller than the thrust of the spring 63, so that when the pressure compensation is adjusted by the pressure regulating mechanism, the pressure regulating bolt 64 can push the pressure plate 62, and the spring 63 can push the dynamic sealing component.

[0043] At the same time, the tightness between the dynamic sealing component and the transmission shaft 4 should ensure that the dynamic sealing component can rotate with the transmission shaft 4. Specifically, the friction between the dynamic sealing component and the transmission shaft 4 is greater than the friction on the matching surfaces of the static base 31 and the dynamic base 51.

[0044] See also Figure 5 In other embodiments, the rotational limiting connection between the moving base 51 and the transmission shaft 4 can be realized by the cooperation of the groove 7 and the limiting strip 8. Specifically, the inner circumference of the moving base 51 is provided with a groove 7 along the axial direction, and the outer circumference of the transmission shaft 4 is provided with a limiting strip 8. The moving base 51 is rotationally limitedly connected to the transmission shaft 4 through the cooperation of the groove 7 and the limiting strip 8.

[0045] The groove 7 is axially opened on the end surface of the moving base 51 close to the static base 31, and the limit strip 8 can slide into the groove 7 from the end of the groove 7. The groove 7 and the limit strip 8 are arranged in pairs, and preferably three pairs of grooves 7 and limit strips 8 are arranged between the moving base 51 and the transmission shaft 4 and are evenly distributed in the circumferential direction.

[0046] The width of the limit strip 8 is substantially the same as that of the groove 7 to ensure synchronization of the rotation of the moving base 51 with the transmission shaft 4. The length (axial direction) of the limit strip 8 is slightly smaller than the length of the groove 7 so that the moving base 51 has room to move toward the static base 31 during pressure compensation adjustment.

[0047] Compared with the tight sleeve connection, the advantage of realizing the rotational limiting connection between the dynamic base 51 and the transmission shaft 4 by cooperating between the groove 7 and the limiting strip 8 is that the dynamic sealing component has little resistance to axial displacement, which facilitates the disassembly and assembly of the dynamic sealing component and the precise adjustment during pressure compensation.

[0048] See also Figure 6 Furthermore, the pressure regulating block 61 is provided with a notch, and a fastening bolt 9 is provided at the notch to detachably fix the pressure regulating block 61 to the transmission shaft 4. The pressure regulating block 61 is in a C-shaped structure. When the fastening bolt 9 is loosened, the pressure regulating block 61 can be removed from the transmission shaft 4. When the fastening bolt 9 is used to lock the pressure regulating block 61 on both sides of the notch, the pressure regulating block 61 can be clamped and fixed on the transmission shaft 4.

[0049] Furthermore, the installation cavity is provided with a first bearing 10 and a second bearing 11 for carrying the transmission shaft 4. The first bearing 10 is installed on the housing 1, and the second bearing 11 is installed on the end cover 2, for supporting the transmission shaft 4 to rotate.

[0050] Furthermore, the housing 1 is provided with a third sealing ring 13 for cooperating with the inner wall of the vacuum welding chamber 200. The housing 1 will not rotate with the transmission shaft 4, and the third sealing ring 13 is used for sealing between the outer wall of the housing 1 and the inner wall of the vacuum welding chamber 200.

[0051] Furthermore, a coupling 14 is provided at the end of the transmission shaft 4. The coupling 14 is used to connect the transmission shaft 4 with the internal mechanism of the vacuum welding chamber 200.

[0052] Further, preferably, in this embodiment, the static base 31 and the dynamic base 51 are made of high temperature resistant ceramics.

[0053] Of course, in other embodiments, the static base 31 and the dynamic base 51 may also be made of high temperature resistant plastic.

[0054] Compared with the prior art, the technical effects of the utility model are:

[0055] The utility model is provided with a pressure regulating mechanism. When slight wear occurs on the mating surfaces of the dynamic sealing component and the static sealing component, resulting in insufficient sealing pressure, the pressure regulating mechanism can be used for adjustment and compensation, which can reduce the replacement frequency of the dynamic sealing component and the static sealing component, thereby reducing the use and maintenance costs.

[0056] At the same time, the installation structure of the utility model and the transmission shaft 4 is relatively simple, and the disassembly and assembly process is relatively convenient.

[0057] Finally, it should be noted that the above implementation modes are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned implementation modes, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned implementation modes, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various implementation modes of the utility model.

Claims

1. A transmission shaft dynamic sealing structure of a vacuum reflow soldering device, comprising a housing and an end cover, wherein the housing and the end cover together form an installation cavity, characterized in that: The installation cavity is provided with a static sealing component, a dynamic sealing component, and a pressure regulating mechanism; The static sealing component comprises a static base, a gap exists between the inner periphery of the static base and the transmission shaft, a first sealing ring is arranged on the outer periphery of the static base, and the first sealing ring is in pressing contact with the inner surface of the housing; The dynamic sealing component comprises a dynamic base, the dynamic base is connected to the transmission shaft in a rotationally limited manner, a second sealing ring is arranged on the inner periphery of the dynamic base, and the second sealing ring is in pressure contact with the outer surface of the transmission shaft; The pressure regulating mechanism includes a pressure regulating block, a pressure plate, a spring, and a pressure regulating bolt. The pressure regulating block is detachably fixedly connected to the transmission shaft. The pressure plate is arranged between the dynamic sealing component and the pressure regulating block. The pressure regulating bolt is threadedly connected to the pressure regulating block and pressed against the pressure plate, so that the axial position of the pressure plate can be adjusted by the pressure regulating bolt, and then the sealing pressure on the mating surfaces of the dynamic sealing component and the static sealing component can be adjusted by the spring.

2. The transmission shaft dynamic sealing structure of the vacuum reflow soldering equipment according to claim 1, characterized in that: There are at least three pressure regulating bolts, and the pressure regulating bolts are evenly distributed around the pressure regulating block.

3. The transmission shaft dynamic sealing structure of the vacuum reflow soldering equipment according to claim 1, characterized in that: The moving base and the pressure plate are clamped and sleeved on the transmission shaft and are rotationally limitedly connected with the transmission shaft.

4. The transmission shaft dynamic sealing structure of the vacuum reflow soldering equipment according to claim 1, characterized in that: A groove is axially arranged on the inner periphery of the moving base, and a limiting strip is convexly arranged on the outer periphery of the transmission shaft. The moving base is rotationally limitedly connected with the transmission shaft through the cooperation between the groove and the limiting strip.

5. The transmission shaft dynamic sealing structure of the vacuum reflow soldering equipment according to claim 1, characterized in that: The pressure regulating block is provided with a notch, and a fastening bolt is provided at the notch to detachably fix the pressure regulating block on the transmission shaft.

6. The transmission shaft dynamic sealing structure of the vacuum reflow soldering equipment according to claim 1, characterized in that: The installation cavity is provided with a first bearing and a second bearing for supporting the transmission shaft.

7. The transmission shaft dynamic sealing structure of the vacuum reflow soldering equipment according to claim 1, characterized in that: The end cover is detachably fixedly connected to the shell.

8. The transmission shaft dynamic sealing structure of the vacuum reflow soldering equipment according to claim 1, characterized in that: The outer shell is provided with a third sealing ring for cooperating with the inner wall of the vacuum welding cavity.

9. The transmission shaft dynamic sealing structure of the vacuum reflow soldering equipment according to claim 1, characterized in that: A coupling is provided at the end of the transmission shaft.

10. The transmission shaft dynamic sealing structure of the vacuum reflow soldering equipment according to claim 1, characterized in that: The static matrix and the dynamic matrix are made of high temperature resistant ceramics.

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