A small household appliance screw

Abstract

The utility model relates to small household electrical appliances accessory technical field discloses a small household electrical appliances screw, including screw rod and the D -shaped screw head of fixed in the right -hand end of screw rod, the inner thread hole is arranged in the screw rod inner wall, the right side of screw rod outer surface top is provided with the wheel pipe hole, the inner wall fixed plug -in of wheel pipe hole has the anti -wear sleeve pipe. This small household electrical appliances screw, through setting up the switch screw head design of this flat head structure's D -shaped screw head, compared with traditional round screw head has clear plane positioning reference, can form positioning cooperation with the adaptive structure of switch assembly in the assembly process, thereby effectively avoided the slippage deviation problem when screw tightening, ensure that the relative position accuracy of screw and switch assembly, not only has promoted the assembly accuracy, can prevent the switch internal structure damage caused by uneven stress, and D -shaped screw head is convenient for special tool force, reduced the operation difficulty in the narrow space.

Description

Technical Field

[0001] This utility model relates to the field of small household appliance accessories technology, specifically a small household appliance screw. Background Technology

[0002] In the small appliance manufacturing industry, screws, as core fastening and connecting components, directly affect the product's assembly efficiency, operational stability, and ease of use. This is especially true in high-frequency operation areas such as switch controls, where the functional adaptability of screws is crucial. Switch components, as core parts of the human-machine interface in small appliances, typically require screws to secure them to the appliance body and work with transmission components such as wheel tubes to complete start-stop and adjustment operations. Therefore, screws in this area must simultaneously meet multiple requirements: reliable fastening, precise assembly, and transmission compatibility.

[0003] Currently, most screws used in the switch parts of small household appliances on the market are traditional round screw heads. These screw heads have obvious limitations in the assembly process: First, round screw heads lack a clear positioning reference, and are prone to slippage and displacement when tightening, resulting in deviations in the relative position of the screw and the switch assembly. This not only affects the assembly accuracy but may also damage the internal structure of the switch due to uneven force. Second, the screw head and screw shaft of traditional screws are not designed with a special fitting structure for the assembly of the wheel tube. The wheel tube usually needs to be indirectly connected to the screw through additional clips or connectors, which not only increases the number of parts and assembly steps but also easily leads to problems such as loose wheel tube installation and axial movement, thereby affecting the sensitivity and service life of the switch operation.

[0004] Meanwhile, the compact internal space of small household appliances limits the assembly and operation space for switch components. The complex mating method of traditional screws and wheel tubes significantly reduces the assembly efficiency of the production line and increases labor costs. To address this situation, there is an urgent need for a screw structure that can achieve precise positioning and simplify the wheel tube assembly process, solving problems such as poor screw head positioning and inconvenient wheel tube assembly in existing technologies, and meeting the efficient and reliable use requirements of small household appliances for switch component connectors. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] In view of the shortcomings of the prior art, this utility model provides a small household appliance screw, which solves the problems mentioned in the background art.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution: a small household appliance screw, including a screw rod and a D-shaped screw head fixed to the right end of the screw rod. The inner wall of the screw rod is provided with an internal thread hole, and a wheel tube hole is opened on the right side of the top of the outer surface of the screw rod. An anti-wear sleeve is fixedly inserted into the inner wall of the wheel tube hole.

[0009] Preferably, the screw and the D-shaped screw head are both made of ASTM1022 carbon structural steel, and the outer surfaces of the screw and the D-shaped screw head are deburred and coated with trivalent zinc plating.

[0010] Preferably, the wear-resistant sleeve is made of GCr15 bearing steel, the wall thickness of the wear-resistant sleeve is one millimeter, the entire wear-resistant sleeve is subjected to quenching heat treatment, the inner wall of the wear-resistant sleeve is polished, and the fit between the wear-resistant sleeve and the wheel tube hole is an interference fit.

[0011] Preferably, the left side of the outer surface of the screw and the left side of the inner wall of the internal threaded hole are both beveled, with the bevel angle being 45 degrees and the length of the right-angle side of the bevel being 0.3 millimeters.

[0012] Preferably, the effective tooth depth of the internal threaded hole is thirteen millimeters, the internal threaded hole is a metric trapezoidal thread with a nominal diameter of three and a half millimeters and a pitch of zero and six millimeters for coarse teeth.

[0013] (III) Beneficial Effects

[0014] Compared with the prior art, this utility model provides a small household appliance screw, which has the following beneficial effects:

[0015] 1. This small appliance screw features a D-shaped flat head design, which, compared to traditional round screw heads, provides a clear planar positioning reference. During assembly, it can quickly form a positioning fit with the adaptable structure of the switch component, effectively avoiding slippage and misalignment during screw tightening. This ensures precise relative positioning between the screw and the switch component, improving assembly accuracy and preventing damage to the internal structure of the switch due to uneven force. Furthermore, the D-shaped screw head facilitates the application of force with specialized tools, reducing the difficulty of operation in confined spaces.

[0016] 2. This small appliance screw, by opening a wheel tube hole on the top of the screw's outer surface and configuring an anti-wear sleeve, achieves direct insertion and mating of the wheel tube and screw. This eliminates the need for additional clips or connectors in traditional structures, simplifies the assembly process, reduces the number of parts, and significantly improves the assembly efficiency of the production line. At the same time, the anti-wear sleeve is made of GCr15 bearing steel and undergoes quenching heat treatment, combined with an inner wall polishing process, which greatly enhances the wear resistance of the wheel tube insertion part, effectively reduces the relative frictional wear between the wheel tube and the screw, avoids problems such as loose wheel tube installation and axial movement, and significantly extends the service life of the switch operating mechanism. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0019] In the diagram: 1. Screw; 101. Internal threaded hole; 102. Wheel tube hole; 2. D-shaped screw head; 3. Anti-wear sleeve. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1-2 This utility model provides a technical solution: a small household appliance screw, including a screw rod 1 and a D-shaped screw head 2 fixed to the right end of the screw rod 1. The inner wall of the screw rod 1 has an internal threaded hole 101, and the right side of the top of the outer surface of the screw rod 1 has a wheel tube hole 102. An anti-wear sleeve 3 is fixedly inserted into the inner wall of the wheel tube hole 102. By designing a flat-headed switch screw head 2, compared to traditional round screw heads, it has a clear planar positioning reference. During assembly, it can quickly form a positioning fit with the adaptable structure of the switch assembly, effectively avoiding slippage and offset during screw tightening. This ensures accurate relative positioning between the screw and the switch assembly, not only improving assembly precision but also preventing internal damage to the switch assembly due to uneven force. The structure is damaged, and the D-shaped screw head 2 facilitates the application of force with special tools, reducing the difficulty of operation in confined spaces. By opening a wheel tube hole 102 on the top of the outer surface of the screw 1 and configuring an anti-wear sleeve 3, the wheel tube and screw can be directly inserted and mated, eliminating the need for additional clips or connectors in the traditional structure, simplifying the assembly process, reducing the number of parts, and significantly improving the assembly efficiency of the production line. At the same time, the anti-wear sleeve 3 is made of GCr15 bearing steel and has undergone quenching heat treatment. Combined with the inner wall polishing process, it greatly enhances the wear resistance of the wheel tube insertion part, effectively alleviates the relative frictional wear between the wheel tube and the screw, avoids problems such as loose wheel tube installation and axial movement, and significantly extends the service life of the switch operating mechanism.

[0022] In this invention, in order to further enhance the rust resistance of the screw, both the screw rod 1 and the D-shaped screw head 2 are made of ASTM1022 carbon structural steel. The outer surfaces of both the screw rod 1 and the D-shaped screw head 2 are deburred and coated with trivalent zinc plating. By applying trivalent zinc plating to the screw surface, the rust resistance of the screw is further enhanced.

[0023] In this utility model, in order to ensure the anti-wear performance of the anti-wear sleeve 3, the material of the anti-wear sleeve 3 is GCr15 bearing steel, the wall thickness of the anti-wear sleeve 3 is one millimeter, the anti-wear sleeve 3 is subjected to quenching heat treatment as a whole, the inner wall of the anti-wear sleeve 3 is polished, and the fit between the anti-wear sleeve 3 and the wheel tube hole 102 is an interference fit. Through the material and heat treatment settings of the anti-wear sleeve 3, the hardness and wear resistance of the anti-wear sleeve are guaranteed, and the polishing of the inner wall of the anti-wear sleeve 3 avoids excessive wear of the wheel tube.

[0024] In this utility model, in order to further facilitate the installation and placement of the screw 1, a chamfer is made on the left side of the outer surface of the screw 1 and the left side of the inner wall of the internal thread hole 101. The angle of the chamfer is 45 degrees and the length of the right angle side of the chamfer is 0.3 mm. By chamfering, the diameter of the insertion tip of the screw 1 is reduced, thereby further facilitating the installation and placement of the screw 1.

[0025] In this invention, in order to further enhance the installation strength of the device, the effective tooth depth of the internal thread hole 101 is thirteen millimeters. The internal thread hole 101 is a metric trapezoidal thread with a nominal diameter of three and a half millimeters and a pitch of zero and a half millimeters. By setting the effective tooth depth of the internal thread hole 101, the installation strength of the device is further enhanced.

[0026] In use, align screw 1 with the mounting hole of the switch assembly, use the flat surface of the D-shaped screw head 2 to position and fit the fitting surface of the assembly, and use a special tool to tighten it through the internal thread hole 101 and the external bolt until the screw head fits tightly with the assembly. Align the wheel tube with the wheel tube hole 102 and insert it along the inner wall of the anti-wear sleeve 3 until it fits properly. Manually rotate the wheel tube to confirm that it rotates smoothly and is in a stable position to complete the installation.

[0027] In summary, this small appliance screw, with its flat-head D-shaped screw head 2 design, provides a clear planar positioning reference compared to traditional round screw heads. During assembly, it can quickly form a positioning fit with the adaptable structure of the switch assembly, effectively avoiding slippage and misalignment during screw tightening. This ensures precise relative positioning between the screw and the switch assembly, improving assembly accuracy and preventing damage to the internal structure of the switch due to uneven force. Furthermore, the D-shaped screw head 2 facilitates the application of force with specialized tools, reducing the difficulty of operation in confined spaces.

[0028] This small appliance screw, by opening a wheel tube hole 102 on the top of the outer surface of the screw 1 and configuring an anti-wear sleeve 3, achieves direct insertion and mating of the wheel tube and the screw. This eliminates the need for additional clips or connectors in traditional structures, simplifies the assembly process, reduces the number of parts, and significantly improves the assembly efficiency of the production line. At the same time, the anti-wear sleeve 3 is made of GCr15 bearing steel and undergoes quenching heat treatment, combined with an inner wall polishing process, which greatly enhances the wear resistance of the wheel tube insertion part, effectively alleviates the relative frictional wear between the wheel tube and the screw, avoids problems such as loose wheel tube installation and axial movement, and significantly extends the service life of the switch operating mechanism.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A small household appliance screw, comprising a screw rod (1) and a D-shaped screw head (2) fixed to the right end of the screw rod (1), characterized in that: The screw (1) has an internal threaded hole (101) on its inner wall and a wheel tube hole (102) on the right side of the top of the outer surface of the screw (1). A wear-resistant sleeve (3) is fixedly inserted into the inner wall of the wheel tube hole (102).

2. The small appliance screw according to claim 1, characterized in that: The screw (1) and the D-shaped screw head (2) are both made of ASTM1022 carbon structural steel. The outer surfaces of the screw (1) and the D-shaped screw head (2) are deburred and coated with trivalent zinc plating.

3. The small appliance screw according to claim 1, characterized in that: The wear-resistant sleeve (3) is made of GCr15 bearing steel, the wall thickness of the wear-resistant sleeve (3) is one millimeter, the wear-resistant sleeve (3) is subjected to quenching heat treatment as a whole, the inner wall of the wear-resistant sleeve (3) is polished, and the fit between the wear-resistant sleeve (3) and the wheel tube hole (102) is an interference fit.

4. A small household appliance screw according to claim 1, characterized in that: The left side of the outer surface of the screw (1) and the left side of the inner wall of the internal thread hole (101) are both beveled. The angle of the bevel is 45 degrees and the length of the right angle side of the bevel is 0.3 mm.

5. A small household appliance screw according to claim 1, characterized in that: The effective tooth depth of the internal threaded hole (101) is thirteen millimeters. The internal threaded hole (101) is a metric trapezoidal thread with a nominal diameter of three and a half millimeters and a pitch of zero and six millimeters for coarse teeth.

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