Half-thread screw

Abstract

The half-thread screw comprises a nut and a screw rod, a glue injection opening is formed in the bottom of an inner hexagonal hole of the nut, the screw rod comprises a thread-free section and a threaded section, a first glue guiding open groove is formed in the side face of the thread-free section, the head end of the first glue guiding open groove is communicated with the glue injection opening of the nut, and the tail end of the first glue guiding open groove is connected with the threaded section. A half-thread screw can be locked into a preset hole of a component firstly, then glue is injected into a glue injection opening, a first glue guide open groove penetrates through a thread-free section, a second glue guide open groove is formed in a threaded section, a glue storage cavity is formed in the lower end face of the threaded section, and the tail end of the second glue guide open groove extends to the lower end face of the threaded section to be communicated with the glue storage cavity; the glue flowing path covers the side face of the screw rod and the lower end face of the threaded section, the stability of connection between the half-thread screw and a component is comprehensively improved, and the half-thread screw is prevented from loosening. The glue flows through a relatively closed path in the fastening structure, so that the glue layer is not easy to air-dry and oxidize due to exposure, and the influence of dry glue layer scraps on fixation is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of screws, in particular to a half-thread screw. Background Art

[0002] The structural feature of a semi-thread screw is that part of the screw is threaded and the other part is a toothless rod without threads. Since a semi-thread screw has a section without teeth, and the toothless section fits more tightly with the preset hole relative to the threaded section, the locking stability is high, and when subjected to shear force, the longer the toothless section, the smaller the possibility of displacement of the component of the fastener. Generally, the rod diameter strength and yield strength of a semi-thread screw are higher than those of a full-thread screw.

[0003] In the prior art, in order to prevent the screw from loosening due to vibration or load changes after being locked into the component, many solutions are to inject screw fastening glue between the screw and the preset hole of the component, and use the glue to further tighten the connection between the two. However, the toothless section of the semi-thread screw fits tightly with the preset hole of the component, and the condition for injecting glue from the gap between the screw and the preset hole is not available; and if the glue is directly applied to the thread and then the screw is locked into the preset hole, it is easy to cause the glue to be exposed for too long, causing the glue layer to dry and oxidize, and some areas cannot be fixed by glue, and the detached glue layer will become waste in the preset hole, affecting the fixation.

[0004] According to the structural characteristics of the semi-thread screw, a new improvement scheme can be proposed to cooperate with the glue to fix the screw. Utility Model Content

[0005] In view of this, the purpose of the present invention is to provide a half-thread screw to solve the above problems.

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

[0007] The utility model provides a half-thread screw, which comprises a nut and a screw rod. The upper end surface of the nut is provided with an inner hexagonal hole, and the bottom of the inner hexagonal hole is provided with a glue injection port; the screw rod comprises a toothless section and a threaded section connected end to end, the upper end of the toothless section is connected to the lower end surface of the nut, a first glue guide slot is provided on the side surface of the toothless section, the first glue guide slot extends from the head end to the end along the axial direction of the toothless section, the head end of the first glue guide slot is communicated with the glue injection port of the nut, the end of the first glue guide slot borders the threaded section, and is used to guide the glue injected from the glue injection port to the threaded section; a second glue guide slot is provided on the threaded section, the second glue guide slot extends from the head end to the end along the axial direction of the threaded section, the head end of the second glue guide slot is staggered with the end of the first glue guide slot, a glue storage cavity is provided on the lower end surface of the threaded section, and the end of the second glue guide slot extends to the lower end surface of the threaded section and is communicated with the glue storage cavity.

[0008] Preferably, the number of the first rubber guiding slots is two, and the two first rubber guiding slots are respectively located on two opposite sides of the same diameter of the toothless segment.

[0009] Preferably, the glue injection port is connected to the two first glue guiding grooves through a glue injection channel, and the glue injection channel extends from below the glue injection port toward the lower end surface of the threaded section, and then respectively forms glue injection channel branches that are obliquely downward and each toward the corresponding first glue guiding groove.

[0010] Preferably, the number of the second glue guiding grooves is two, and the two second glue guiding grooves are respectively located on two opposite sides of the same diameter of the threaded segment.

[0011] Preferably, the nut is a hexagonal nut.

[0012] Preferably, the diameter of the glue injection port is 5.5-6.5 mm.

[0013] Preferably, the toothless section and the threaded section of the screw are integrally formed.

[0014] Preferably, the glue storage cavity is a hemispherical cavity.

[0015] The technical effects achieved by the technical solution of the utility model mainly include:

[0016] When using the above-mentioned half-thread screw to fix a component, the half-thread screw can be first locked into the preset hole of the component, so that the screw rod and the preset hole are locked together, and then glue is injected into the glue injection port at the bottom of the hexagonal hole, and the first glue guide groove is used to pass through the toothless section. Even if the toothless section of the half-thread screw is tightly fitted with the preset hole of the component, the glue can continue to flow downward along the first glue guide groove to the threaded section, which is convenient for glue injection;

[0017] The staggered second glue guiding groove and the first glue guiding groove enable the glue reaching the thread segment to continue to flow along the spiral direction of the thread and cover more circumferential paths of the thread;

[0018] The glue can fall from the second glue guide groove to the lower end face of the threaded section, playing the role of fixing the lower end face of the threaded section. The glue flow path covers the side face of the screw and the lower end face of the threaded section, further comprehensively improving the stability of the connection between the half-thread screw and the component, and preventing the half-thread screw from loosening.

[0019] The glue flows through a relatively closed path inside the fastening structure, which makes it less likely for the glue layer to dry out and oxidize due to exposure, thus ensuring the bonding effect and preventing the dry glue layer debris from affecting fixation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1It is a structural schematic diagram of a semi-thread screw provided by an embodiment of the utility model;

[0021] Figure 2 is a cross-sectional structural diagram of the semi-thread screw;

[0022] Figure 3 is a top view of the semi-thread screw;

[0023] Figure 4 It is a bottom view of the semi-thread screw.

[0024] The reference numerals in the above drawings are:

[0025] Nut 1, hexagonal hole 10, glue injection port 101, glue injection channel 11, glue injection branch 12, screw rod 2, toothless section 21, first glue guiding slot 210, threaded section 22, second glue guiding slot 220, glue storage cavity 221. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the utility model clearer, the specific embodiments of the utility model are described in detail below in conjunction with the accompanying drawings. Examples of these preferred embodiments are illustrated in the accompanying drawings. The embodiments of the utility model shown in the accompanying drawings and described according to the accompanying drawings are merely exemplary, and the utility model is not limited to these embodiments.

[0027] It should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only structures and / or processing steps closely related to the solution according to the present invention are shown in the accompanying drawings, while other details that are not very relevant are omitted.

[0028] Reference Figures 1 to 3 As shown, an embodiment of the utility model provides a semi-thread screw, which includes a nut 1 and a screw rod 2.

[0029] The upper end surface of the nut 1 is provided with a hexagonal hole 10, and the bottom of the hexagonal hole 10 is provided with a glue injection port 101;

[0030] The screw rod 2 includes a toothless section 21 and a threaded section 22 connected end to end. The upper end of the toothless section 21 is connected to the lower end surface of the nut 1. A first glue guiding groove 210 is provided on the side surface of the toothless section 21. The first glue guiding groove 210 extends from the head end to the tail end along the axial direction of the toothless section 21. The head end of the first glue guiding groove 210 is connected to the glue injection port 101 of the nut 1. The tail end of the first glue guiding groove 210 borders on the threaded section 22, so as to guide the glue injected from the glue injection port 101 to the threaded section 22.

[0031] The threaded section 22 is provided with a second adhesive guiding groove 220, which extends from the head end to the tail end along the axial direction of the threaded section 22, and the head end of the second adhesive guiding groove 220 is offset from the tail end of the first adhesive guiding groove 210. Figure 4 As shown, a glue storage cavity 221 is formed on the lower end surface of the threaded segment 22 , and the end of the second glue guiding groove 220 extends to the lower end surface of the threaded segment 22 and communicates with the glue storage cavity 221 .

[0032] When using the half-thread screw provided in the embodiment of the utility model to fix a component, the half-thread screw can be first locked into the preset hole of the component, so that the screw rod 2 and the preset hole are locked together, and then glue is injected into the glue injection port 101 at the bottom of the hexagonal hole 10. The glue can flow downward from the glue injection port 101 to the connected first glue guiding groove 210, and the first glue guiding groove 210 can be used to pass through the toothless section 21. Even if the toothless section 21 of the half-thread screw is tightly fitted with the preset hole of the component, the glue can continue to flow downward along the first glue guiding groove 210 to the threaded section 22. The misaligned second glue guide slot 220 and the first glue guide slot 210 allow the glue that reaches the threaded segment 22 to continue to flow along the spiral direction of the thread and cover more circumferential paths of the thread until it reaches the second glue guide slot 220. The glue then falls from the second glue guide slot 220 to the lower end face of the threaded segment 22 and flows into the glue storage cavity 221, so that the glue can also play a role in fixing the lower end face of the threaded segment 22. The glue flow path covers the side of the screw 2 and the lower end face of the threaded segment 22, further comprehensively improving the stability of the connection between the half-thread screw and the component, and preventing the half-thread screw from loosening. The glue flows through a relatively closed path inside the fastening structure, and it is not easy for the glue layer to dry and oxidize due to exposure, thereby ensuring the bonding effect and preventing the dry glue layer waste from affecting the fixation.

[0033] When the half-thread screw is installed in the downward preset hole with the lower end face of the threaded section 22 facing upward, the half-thread screw is inverted and its glue injection port 101 is set downward. A certain amount of glue can be injected into the glue storage cavity 221 first, so that when the half-thread screw is installed in the preset hole facing upward, the glue can flow out of the glue storage cavity 221 and flow in the opposite direction toward the toothless section 21 along the second glue guiding groove 220, thereby playing the role of gluing and fixing the screw 2.

[0034] For example, in this embodiment, the number of the first glue guiding slots 210 is two, and the two first glue guiding slots 210 are respectively located on opposite sides of the same diameter of the toothless section 21. The first glue guiding slots 210 for glue flow are respectively provided on both sides of the center symmetry of the toothless section 21, so that the distribution of glue on the screw 2 can be more uniform and balanced, so that the glue can cover more structural positions, and the fixed structure is more stable.

[0035] Specifically, the glue injection port 101 is connected to the two first glue guiding grooves 210 through the glue injection channel 11, and the glue injection channel 11 extends from the bottom of the glue injection port 101 toward the lower end surface of the threaded section 22, and then respectively forms a glue injection branch path 12 that is obliquely downward and respectively toward the corresponding first glue guiding groove 210. The glue flows downward from the glue injection port 101 along the glue injection channel 11, and is divided into a glue flow obliquely downward to the left and obliquely downward to the right at the fork, and flows from the respective glue injection branch paths 12 to the corresponding first glue guiding groove 210, so that the glue flows on the opposite sides of the toothless section 21 at the same time.

[0036] Exemplarily, the number of the second glue guiding grooves 220 is two, and the two second glue guiding grooves 220 are respectively located on two opposite sides of the same diameter of the threaded segment 22 .

[0037] Considering that sufficient area is required to facilitate the opening of the glue injection port 101 and the half-thread screw is conveniently screwed, the nut 1 is a hexagonal nut. The operator can directly screw the hexagonal structure on the outside of the nut 1 with a tool such as a wrench, or screw the half-thread screw through the hexagonal hole 10.

[0038] The specific size of the glue injection port 101 is set according to the actual needs of the semi-thread screw, and attention should be paid to ensuring smooth injection of glue. Figure 2 As shown, the diameter D1 of the glue injection port 101 is 5.5-6.5 mm.

[0039] For the convenience of processing, the toothless section 21 and the threaded section 22 of the screw rod 2 are integrally formed.

[0040] The structure of the glue storage chamber 221 needs to be able to store a certain amount of glue while facilitating the internal glue to flow out when the half-thread screw is turned. In this embodiment, the glue storage chamber 221 is a hemispherical chamber.

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

[0042] The above is only a specific implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A semi-thread screw, characterized in that: It comprises a nut (1) and a screw (2). The upper end surface of the nut (1) is provided with a hexagonal hole (10), and the bottom of the hexagonal hole (10) is provided with a glue injection port (101); The screw rod (2) comprises a toothless section (21) and a threaded section (22) connected end to end, the upper end of the toothless section (21) is connected to the lower end surface of the nut (1), a first glue guiding groove (210) is provided on the side surface of the toothless section (21), the first glue guiding groove (210) extends from the head end to the tail end along the axial direction of the toothless section (21), the head end of the first glue guiding groove (210) is connected to the glue injection port (101) of the nut (1), and the tail end of the first glue guiding groove (210) is adjacent to the threaded section (22), so as to guide the glue injected from the glue injection port (101) to the threaded section (22); The threaded section (22) is provided with a second glue guiding groove (220), the second glue guiding groove (220) extends from its head end to its tail end along the axial direction of the threaded section (22), the head end of the second glue guiding groove (220) and the tail end of the first glue guiding groove (210) are mutually offset, the lower end surface of the threaded section (22) is provided with a glue storage cavity (221), the tail end of the second glue guiding groove (220) extends to the lower end surface of the threaded section (22) and is communicated with the glue storage cavity (221).

2. The semi-thread screw according to claim 1, characterized in that: The number of the first adhesive guiding slots (210) is two, and the two first adhesive guiding slots (210) are respectively located on two opposite sides of the same diameter of the toothless section (21).

3. The semi-thread screw according to claim 2, characterized in that: The glue injection port (101) is connected to the two first glue guiding slots (210) respectively through the glue injection channel (11). The glue injection channel (11) extends from the bottom of the glue injection port (101) toward the lower end surface of the threaded section (22), and then respectively forms glue injection branch paths (12) that are inclined downward and each of which is directed toward the corresponding first glue guiding slot (210).

4. The semi-thread screw according to claim 1, characterized in that: The number of the second glue guiding grooves (220) is two, and the two second glue guiding grooves (220) are respectively located on two opposite sides of the same diameter of the threaded section (22).

5. The semi-thread screw according to claim 1, characterized in that: The nut (1) is a hexagonal nut.

6. The semi-thread screw according to claim 1, characterized in that: The diameter of the glue injection port (101) is 5.5-6.5 mm.

7. The semi-thread screw according to claim 1, characterized in that: The toothless section (21) and the threaded section (22) of the screw rod (2) are an integrally formed structure.

8. The semi-thread screw according to claim 1, characterized in that: The glue storage cavity (221) is a hemispherical cavity.

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