Bolt structure for connecting monocrystalline silicon main heater and foot plate

Abstract

The utility model relates to the technical field of monocrystalline silicon, in particular to a bolt structure for connecting a monocrystalline silicon main heater and a foot plate, which comprises a nut and a screw connected with the nut. A notch is formed in the screw rod in the direction parallel to the axial direction of the screw rod, and the notch is used for reducing internal stress generated by thermal expansion in the Z direction of the screw rod. According to the utility model, the gap used for reducing the internal stress generated by thermal expansion in the Z direction of the screw rod is formed in the screw rod along the axial direction parallel to the screw rod, so that when the screw rod is heated to expand in the Z direction, an additional space is provided through the gap, and the additional space can enable the screw rod to have a certain expansion space when the screw rod expands in the Z direction; and the internal stress generated by thermal expansion in the Z direction of the screw rod is reduced, so that the situation that the main heater cracks due to expansion in the Z direction of the screw rod is reduced, the service life of the main heater is greatly prolonged, and the production cost of single crystals is further reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of single crystal silicon, in particular to a bolt structure used for connecting a single crystal silicon main heater and a foot plate. Background Art

[0002] In the production of monocrystalline silicon, cracking at the connection between the main heater and the foot plate has always been a problem that has plagued monocrystalline silicon production companies.

[0003] like Figure 7-9 As shown, the main heater and the foot plate are fixedly connected by bolts. In actual applications, it is found that with the increase of usage time, cracks often appear at the connection between the main heater and the foot plate, causing the service life of the main heater to be greatly reduced, which in turn leads to high non-silicon costs in single crystal production.

[0004] The inventors have found that the bolts connecting the main heater and the foot plate are usually made of carbon-carbon composite materials. Due to the different properties of carbon-carbon composite materials during the production process, the thermal expansion coefficient of carbon-carbon composite materials in the XY direction is small, while the thermal expansion coefficient in the Z direction is twice that of the XY direction, which ultimately leads to the following problems: Figure 6 The thermal expansion coefficient of the bolt shown in the figure is small in the XY direction, but large in the Z direction. The bolt expands in the Z direction under high temperature, forming a force breakthrough point, which in turn causes cracks in the connection between the main heater and the foot plate. Utility Model Content

[0005] The purpose of the present utility model is to provide a bolt structure for connecting a monocrystalline silicon main heater and a foot plate, so as to solve the problems raised in the above background technology.

[0006] The technical solution adopted in this utility model is:

[0007] A bolt structure for connecting a monocrystalline silicon main heater and a base plate, comprising:

[0008] A nut and a screw connected to the nut;

[0009] in,

[0010] The screw is provided with a notch in a direction parallel to its axial direction, and the notch is used to reduce the internal stress of the screw generated by thermal expansion in the Z direction.

[0011] Preferably, the notch is a straight slot opened on the central plane of the screw parallel to the axial direction of the screw.

[0012] Preferably, the notch is a symmetrical milling edge opened on the screw along two symmetrical planes parallel to the axial direction of the screw.

[0013] Preferably, the notch includes a slotted opening provided on a central plane of the screw parallel to the axial direction of the screw and symmetrical milled edges provided on two symmetrical planes of the screw parallel to the axial direction of the screw.

[0014] Preferably, the width of the notch is 1-5 mm.

[0015] Preferably, the width of the symmetrical milling edge is 1-5 mm.

[0016] Preferably, the notch is a cross notch provided on a center plane of the screw parallel to the axial direction of the screw.

[0017] Preferably, the width of the cross notch is 1-5 mm.

[0018] Preferably, the notch includes a straight notch formed on a central plane of the screw parallel to the axial direction of the screw and a circular notch formed in the center of the screw and extending along the axial direction of the screw.

[0019] Preferably, the diameter of the circular notch is 3-12 mm, and the width of the straight notch is 1-5 mm.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] In the present utility model, a notch is opened on the screw parallel to the axial direction of the screw to reduce the internal stress generated by thermal expansion in the Z direction of the screw, so that when the screw expands in the Z direction due to heat, additional space is provided through the notch. This additional space allows a certain amount of expansion and contraction room for the screw in the Z direction during thermal expansion, reducing the internal stress generated by thermal expansion in the Z direction of the screw, thereby reducing the situation where the main heater is cracked due to the expansion of the screw in the Z direction, greatly improving the service life of the main heater, and thus reducing the cost of producing single crystals. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0023] Figure 1 This is a structural diagram of the first embodiment of the present application;

[0024] Figure 2 This is a schematic structural diagram of the second embodiment of the present application;

[0025] Figure 3This is a schematic structural diagram of the third embodiment of the present application;

[0026] Figure 4 This is a structural diagram of the fourth embodiment of the present application;

[0027] Figure 5 This is a structural diagram of the fifth embodiment of the present application;

[0028] Figure 6 It is a schematic diagram of the overall structure of a bolt in the prior art;

[0029] Figure 7 It is a schematic diagram of the overall structure of the main heater in the prior art;

[0030] Figure 8 It is a schematic diagram of the overall structure of the footboard in the prior art;

[0031] Figure 9 This is a schematic diagram of the connection between the main heater and the foot plate in the prior art.

[0032] Reference numerals:

[0033] 1. Nut;

[0034] 2. Screw; 21. Slotted notch; 22. Milling edge; 23. Slotted notch; 24. Milling edge; 25. Cross notch; 26. Slotted notch; 27. Circular notch;

[0035] 3. Main heater; 4. Footboard. DETAILED DESCRIPTION

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the products of the present invention are conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0037] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but a person of ordinary skill in the art will recognize the application of other processes and / or the use of other materials.

[0038] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0039] In view of the current problem that cracks parallel to the Z direction of the bolts are generated on the main heater due to the large thermal expansion coefficient of the bolts in the Z direction.

[0040] like Figure 1-5 As shown, an embodiment of the present invention provides a bolt structure for connecting a monocrystalline silicon main heater and a foot plate, which mainly consists of a nut 1 and a screw rod 2 connected to the nut 1.

[0041] Among them, the screw 2 is provided with a notch parallel to its axial direction, which is used to reduce the internal stress of the screw 2 caused by thermal expansion in the Z direction, so that when the screw 2 is thermally expanded in the Z direction, additional space is provided through the notch. This additional space allows the screw 2 to have a certain amount of room for expansion and contraction in the Z direction when it is thermally expanded, thereby reducing the internal stress of the screw 2 caused by thermal expansion in the Z direction.

[0042] The specific notch form can be any of the following forms, such as a straight notch 21, a symmetrical milled edge 22, and the like.

[0043] Specifically, in Figure 1 In the first embodiment shown, the bolt structure includes a nut 1 and a screw 2 connected to the nut 1. A slot 21 is defined along the screw 2's center plane, parallel to its axial direction. This slot 21 serves to reduce internal stress in the Z-direction of the screw 2 due to thermal expansion. Preferably, the width of the slot 21 is approximately 1-5 mm.

[0044] In such Figure 2 In the second embodiment shown, the bolt structure includes a nut 1 and a screw 2 connected to the nut 1. Symmetrical milling edges 22 are formed on the screw 2 along two symmetrical planes parallel to its axial direction. These milling edges 22 are used to reduce internal stress generated by thermal expansion of the screw 2 in the Z direction. Preferably, the width of these milling edges 22 is approximately 1-5 mm.

[0045] In such Figure 3 In the third embodiment shown, the bolt structure includes a nut 1 and a screw 2 connected to the nut 1. The screw 2 has a slotted notch 23 defined along a central plane parallel to its axial direction, and symmetrical milled edges 24 defined along two symmetrical planes parallel to the axial direction of the screw 2. Both the slotted notch 23 and the symmetrical milled edges 24 are designed to reduce internal stress in the Z-direction of the screw 2 due to thermal expansion. In a preferred embodiment, the slotted notch 23 has a width of approximately 1-5 mm, and the symmetrical milled edges 24 have a width of approximately 1-5 mm.

[0046] In such Figure 4 In the fourth embodiment shown, the bolt structure includes a nut 1 and a screw 2 connected to the nut 1. A cross notch 25 is defined along the screw 2's center plane, parallel to its axial direction. This cross notch 25 is used to reduce internal stress generated by thermal expansion of the screw 2 in the Z direction. In a preferred embodiment, the width of the cross notch 25 is approximately 1-5 mm.

[0047] In such Figure 5 In the fifth embodiment shown, the bolt structure comprises a nut 1 and a screw 2 connected to the nut 1. The screw 2 has a slot 26 defined along a central plane parallel to its axial direction, and a circular slot 27 defined in the center of the screw 2 and extending axially along the screw 2. Both the slot 26 and the circular slot 27 are designed to reduce internal stress in the Z-direction caused by thermal expansion of the screw 2. In a preferred embodiment, the slot 26 has a width of approximately 1-5 mm, and the circular slot 27 has a diameter of approximately 3-12 mm.

[0048] It can be seen from the above-mentioned embodiments that the bolt structure disclosed in the present invention can reduce the occurrence of cracks in the main heater 3 due to the expansion of the screw 2 in the Z direction.

[0049] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A bolt structure for connecting a monocrystalline silicon main heater and a foot plate, characterized in that: include: A nut and a screw connected to the nut; wherein the screw is provided with a notch in a direction parallel to its axial direction, and the notch is used to reduce the internal stress of the screw caused by thermal expansion in the Z direction.

2. The bolt structure according to claim 1, characterized in that: The notch is a straight slot opened on the central plane of the screw rod parallel to the axial direction of the screw rod.

3. The bolt structure according to claim 1, characterized in that: The notches are symmetrical milling edges formed on the screw along two symmetrical planes parallel to the axial direction of the screw.

4. The bolt structure according to claim 1, characterized in that: The notch includes a straight slot provided on a central plane of the screw rod parallel to the axial direction of the screw rod and symmetrical milling edges provided on two symmetrical planes of the screw rod parallel to the axial direction of the screw rod.

5. The bolt structure according to claim 2 or 4, characterized in that: The width of the notch is 1-5 mm.

6. The bolt structure according to claim 3 or 4, characterized in that: The width of the symmetrical milling edge is 1-5 mm.

7. The bolt structure according to claim 1, characterized in that: The notch is a cross notch opened on the central plane of the screw parallel to the axial direction of the screw.

8. The bolt structure according to claim 7, characterized in that: The width of the cross notch is 1-5 mm.

9. The bolt structure according to claim 1, characterized in that: The notch includes a straight notch formed on the screw along a central plane parallel to the axial direction of the screw and a circular notch formed in the center of the screw and extending along the axial direction of the screw.

10. The bolt structure according to claim 9, characterized in that: The diameter of the circular notch is 3-12 mm, and the width of the straight notch is 1-5 mm.

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