Expansion bolt for hanging household appliance

Abstract

The embodiment of the invention provides an expansion bolt for hanging a household appliance, and relates to the technical field of household appliance mounting accessories. An expansion bolt for hanging a household appliance comprises an expansion screw rod, the outer side of the expansion screw rod is sleeved with an expansion sleeve, and the thread end of the expansion screw rod is sleeved with an anti-disengaging gasket and is in threaded connection with a tightening nut which is used for tightening the expansion screw rod and the expansion sleeve in a threaded mode. And limiting assemblies used for limiting and preventing the expansion sleeve from falling off are arranged at the screw rod end of the expansion screw rod in a triangular equidistant mode and comprise sliding cavities transversely formed in the screw rod end of the expansion screw rod, and positioning holes are formed in the expansion screw rod and the expansion sleeve. The expansion bolt has a limiting and stopping effect on the expansion screw and the expansion sleeve and the inner wall of the drilling hole, the fit stability of the whole expansion bolt and the drilling hole is improved, the expansion bolt is prevented from loosening and falling off, a suspended household appliance is effectively and stably supported, and the safety of the mounting state of the household appliance is guaranteed.

Description

Technical Field

[0001] This invention belongs to the technical field of home appliance installation accessories, and particularly relates to an expansion bolt for home appliance suspension. Background Technology

[0002] Expansion bolts are needed when installing home appliances. They are special threaded fasteners used to fix pipe supports, hangers, brackets or equipment to walls, floors or columns. First, drill a hole at the installation surface using an electric drill bit of the same specification as the expansion bolt, and then hammer the expansion bolt into the hole. This will firmly hang and fix the home appliance on the installation surface.

[0003] In existing technology (patent application CN101526099B, patent titled "Expansion Bolt"), tightening the nut on the bolt opens several expansion plates, the thickness of which can be arbitrarily increased as needed to improve the strength of the expansion bolt. However, in implementing this technical solution, at least the following problems were found in the existing technology: After using expansion bolts to suspend and fix home appliances to the mounting surface, the expansion screw and expansion sleeve on the expansion bolt are in a sliding sleeve relationship. As the expansion bolt is pressed down as a whole, it is subjected to the squeezing force of the drilled hole to make it firm. During this process, due to the influence of the drilling inclination, the hole diameter is different, which causes the expansion bolt to be driven in unevenly, making it easy to loosen or even fall off. This leads to the instability of the suspended home appliance, or even the safety problem of it falling down. Summary of the Invention

[0004] This application aims to at least solve one of the technical problems existing in the prior art: traditional expansion bolts do not have an equidistant limiting function, resulting in uneven force between the expansion bolt and the drilled hole, making them prone to loosening and falling off. To this end, this application proposes an expansion bolt for hanging household appliances.

[0005] To achieve the above objectives, the specific technical solution of the present invention is as follows: An expansion bolt for hanging household appliances includes an expansion screw, an expansion sleeve is fitted on the outer side of the expansion screw, and an anti-loosening washer is fitted on the threaded end of the expansion screw, and a tightening nut is threadedly connected to it for tightening the expansion screw and the expansion sleeve together. In addition, the screw end of the expansion screw is provided with a limiting component for limiting the expansion sleeve to prevent it from falling off, and includes a sliding cavity that is laterally opened in the screw end of the expansion screw, and positioning holes are provided on both the expansion screw and the expansion sleeve. The expansion screw has a locking assembly on its threaded end for restricting the reverse tightening of the nut, and includes a reverse screw head fixed near the threaded end of the expansion screw, with a reverse nut for locking and preventing the nut from coming loose when tightening.

[0006] Preferably, the limiting component further includes a top pressure head embedded on the outer side of the screw end of the expansion screw, and a top pressure rod that slides with the sliding cavity is fixed laterally on the inner side of the top pressure head, and a compression spring is sleeved on the top pressure rod, and a back pressure head is fixed in a triangular equidistant shape on the inner side of the top pressure rod.

[0007] Preferably, a positioning head slides within the three sets of positioning holes, and the inner side of the positioning head is provided with a pressing groove that slides with the pressing head. An elastic ring is provided between the expansion screw and the expansion sleeve for the positioning head to elastically buffer and reset.

[0008] Preferably, the protrusion height of the three sets of pressing heads is distributed in a decreasing manner from the outside to the inside along the pressing groove on the inner side of the positioning head, and a limiting head is fixed on the inner side of the three sets of pressing heads, and a limiting groove is provided on the inner side of the sliding cavity for the limiting head to stop and limit.

[0009] Preferably, the locking assembly further includes an inner sliding groove formed in the reverse screw head, and an inner sliding head that slides and engages with the inner sliding groove is laterally fixed in the reverse nut, as well as a reserved cavity formed in a triangular equidistant shape at the inner end of the inner sliding head, and guide rail grooves are formed on both sides of the three reserved cavities.

[0010] Preferably, guide blocks slide within the three sets of guide rail grooves, and locking members that slide with the reserved cavity are fixed on the inner side of the three sets of guide rail blocks, and locking teeth for reverse restriction of tightening nuts are provided on the outer side of the locking members.

[0011] Preferably, the diameter of the reverse screw head is smaller than the diameter of the screw thread end of the expansion screw, and the diameters of the tightening nut and the reverse nut are the same.

[0012] Preferably, the locking teeth on the outer side of the three sets of locking components are opposite in direction to the screw threads inside the tightening nut, and a top spring is fixed between the three sets of locking components and the reserved cavity. A reserved groove for sliding with the locking components is provided at the screw thread end of the expansion screw in a triangular equidistant shape.

[0013] Preferably, the expansion sleeve has a triangularly equidistant joint fixed on the side near the tightening nut, and the inner side of the anti-loosening gasket has a mating groove for engaging with the joint.

[0014] Preferably, an anti-loosening washer is provided between the tightening nut and the anti-loosening washer and is fitted with the thread end of the expansion screw, and a protrusion is fixed on the outer side of the expansion sleeve near the tightening nut.

[0015] An expansion bolt for hanging household appliances according to the present invention has the following advantages: 1. This type of expansion bolt for appliance suspension firstly, under the impact force of the expansion bolt being driven into the drilled hole, the first pressure head is forced to slide in the sliding cavity, and the pressure rod drives the pressure head to squeeze the three sets of positioning heads outward through the pressure groove. The three sets of positioning heads, subjected to continuous pressure, pass through the positioning holes on the expansion bolt to the outside of the expansion sleeve, and stop and limit the movement against the inner wall of the drilled hole. This provides a limiting and stopping effect between the expansion bolt and the expansion sleeve and the inner wall of the drilled hole, improving the fit and stability of the expansion bolt and the drilled hole, preventing it from loosening and falling off, and providing effective and stable support for the suspended appliance, ensuring its safe installation.

[0016] 2. In this type of expansion bolt for home appliance suspension, the reverse nut is first tightened onto the reverse thread head, and the inner sliding head inside slides into the inner groove. Under the action of the extrusion force, the three sets of locking parts are forced to move the locking teeth to the inner thread of the tightening nut, thereby achieving double reverse restriction on the tightening nut to prevent the tightening nut from loosening under force, and further improving the stability of the suspension installation between the expansion bolt and the home appliance.

[0017] 3. This type of expansion bolt for appliance hanging simultaneously uses a reverse nut to drive a dust cap to cover the exposed expansion bolt, anti-loosening washer, tightening nut, and reverse nut. Then, the sealing ring in the sealing groove seals the connection between the dust cap and the appliance hanging bracket, and the sealant on the sealing ring adheres the dust cap and the appliance hanging bracket tightly. This design is aesthetically pleasing, dustproof, and also prevents rust on the exposed bolt end of the outdoor appliance hanging point, extending the life of the expansion bolt. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is an installation diagram of an expansion bolt structure for hanging household appliances according to the present invention; Figure 2 This is an initial state diagram of an expansion bolt structure for home appliance suspension according to the present invention; Figure 3 This is a top view of the expansion screw structure of the present invention; Figure 4 This is a bottom view of the expansion sleeve structure of the present invention; Figure 5 This is an exploded view of the anti-loosening washer, tightening nut, anti-loosening washer, and dust cap of the present invention; Figure 6 This is a cross-sectional view of the expansion screw and limiting assembly structure in the installation state of the present invention; Figure 7 This is a cross-sectional view of the initial state of the expansion screw and limiting assembly structure of the present invention; Figure 8 This is a side view of the limiting component structure in its installed state according to the present invention; Figure 9 This is an exploded bottom view of the initial state of the limiting component structure of the present invention; Figure 10 This is a partial cross-sectional view of the expansion screw structure of the present invention; Figure 11 This is an exploded view of the locking and sealing components of the present invention; Figure 12 This is a bottom cross-sectional view of the sealing component structure of the present invention; Figure 13 This is a partial side view of the sealing component structure of the present invention; Figure 14 This is a bottom view of the inner slider structure of the present invention; Figure 15 This is an exploded view of the sealing component structure of the present invention.

[0020] The markings in the diagram are as follows: 1. Expansion screw; 2. Expansion sleeve; 3. Anti-loosening washer; 4. Tightening nut; 51. Sliding cavity; 52. Positioning hole; 53. Top pressure head; 54. Top pressure rod; 55. Compression spring; 56. Abutment head; 57. Positioning head; 58. Abutment groove; 59. Elastic ring; 61. Reverse screw head; 62. Inner sliding groove; 63. Reverse nut; 64. Inner sliding head; 65. Reserved cavity; 66. Guide rail groove; 67. Guide rail block; 68. Locking element; 69. Locking tooth; 71. Dust cap; 72. Tightening groove; 73. Sealing groove; 74. Sealing ring; 75. Sealant; 8. Top spring; 9. Reserved groove; 10. Connecting joint; 11. Butt joint groove; 12. Anti-loosening washer; 13. Protruding head; 14. Reserved opening. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments: like Figures 1-15 As shown, an expansion bolt for hanging household appliances according to the present invention includes an expansion screw 1, an expansion sleeve 2 sleeved on the outer side of the expansion screw 1, and an anti-loosening washer 3 sleeved on the threaded end of the expansion screw 1. A matching joint 10 is fixed in a triangular equidistant shape on the side of the expansion sleeve 2 near the tightening nut 4, and a mating groove 11 is opened on the inner side of the anti-loosening washer 3 to engage with the matching joint 10, which serves to pre-align the anti-loosening washer 3 to prevent displacement and rotation, and is threadedly connected to the tightening nut 4 for threading the expansion screw 1 and the expansion sleeve 2. An anti-loosening washer 12 is provided between the tightening nut 4 and the anti-loosening washer 3, which is fitted with the thread end of the expansion screw 1. This anti-loosening washer provides elastic buffering between the tightening nut 4 and the anti-loosening washer 3, improving the tightness of the connection between the tightening nut 4 and the anti-loosening washer 3. A protruding head 13 is fixed on the outer side of the expansion sleeve 2 near the tightening nut 4. This head acts as a reverse locking mechanism between the expansion sleeve 2 and the inner wall of the drill hole, improving the tightness of the expansion connection. The head is also turned outwards. Additionally, a reserved opening 14 is provided on the outer side of the expansion sleeve 2 to offset the compressive stress of the expansion sleeve 2 when it is subjected to compression and expansion deformation, preventing the expansion sleeve 2 from breaking due to excessive compression deformation.

[0022] like Figures 3-14 As shown, the screw end of the expansion screw 1 is provided with a limiting component for limiting the expansion sleeve 2 to prevent it from falling off, and includes a sliding cavity 51 that is laterally opened in the screw end of the expansion screw 1. Both the expansion screw 1 and the expansion sleeve 2 are provided with positioning holes 52. The limiting component also includes a top pressure head 53 embedded on the outside of the screw end of the expansion screw 1, and a top pressure rod 54 that slides with the sliding cavity 51 is laterally fixed on the inside of the top pressure head 53. Under the impact force of the expansion bolt being hammered into the drill hole, the top pressure head 53, which is the first to be subjected to force, is forced to drive the top pressure rod 54 to slide in the sliding cavity 51. A compression spring 55 is sleeved on the top pressure rod 54, and the top pressure rod 54 compresses the compression spring 55. There is also a pressing head 56 that is fixed in a triangular equidistant shape on the inside of the top pressure rod 54. Positioning heads 57 slide within three sets of positioning holes 52, and the inner side of the positioning head 57 is provided with a pressing groove 58 that slides with the pressing head 56. The pressing rod 54 drives the pressing head 56 to press the three sets of positioning heads 57 outward through the pressing groove 58. An elastic ring 59 is provided between the expansion screw 1 and the expansion sleeve 2 for the positioning head 57 to elastically buffer and reset. The three sets of positioning heads 57 simultaneously flatten the three sets of elastic rings 59. The three sets of positioning heads 57, which are subjected to continuous extrusion force, pass through the positioning holes 52 on the expansion screw 1 to the outside of the expansion sleeve 2 and abut against the inner wall of the drill hole, thereby making a stable fit between the expansion screw 1 and the expansion sleeve 2 and the inner wall of the drill hole. This further limits and abuts the expansion screw 1 and the expansion sleeve 2 and the inner wall of the drill hole, improving the overall fit and stability of the expansion bolt and the drill hole. The height of the three sets of pressing heads 56 is distributed in a decreasing manner from the outside to the inside along the pressing groove 58 on the inner side of the positioning head 57. As the three sets of pressing heads 56 move forward and squeeze, the three sets of positioning heads 57 are forced out in an orderly manner. The inner side of the three sets of pressing heads 56 is fixed with a limiting head, and a limiting groove is opened on the inner side of the sliding cavity 51 for the limiting head to stop and limit the movement. This provides compensation for the three sets of pressing heads 56 to stop and reach the correct position, so that the three sets of pressing heads 56 move forward and squeeze into the correct position.

[0023] The expansion screw 1 is provided with a locking assembly for restricting the reverse tightening of the nut 4 on the thread end, and includes a reverse screw head 61 fixed near the thread end of the expansion screw 1, and a reverse nut 63 for locking and preventing the nut 4 from being dislodged is threaded on the reverse screw head 61. The locking assembly also includes an inner slide groove 62 opened in the reverse screw head 61, and an inner slide head 64 that slides with the inner slide groove 62 is fixed laterally in the reverse nut 63. First, the reverse nut 63 is tightened onto the reverse screw head 61, and the inner slide head 64 inside it slides into the inner slide groove 62. There are also reserved cavities 65 opened in the inner end of the inner slide head 64 in a triangular equidistant shape, and guide rail grooves 66 are opened on both sides of the three sets of reserved cavities 65. Guide blocks 67 slide within the three sets of guide rail grooves 66, and locking members 68 that slide with the reserved cavities 65 are fixed to the inner sides of the three sets of guide rail blocks 67. The three sets of locking members 68 are constantly squeezed by the inner sliding groove 62, and locking teeth 69 are provided on the outer side of the locking members 68 for reversing the tightening of the nut 4, forcing the three top springs 8 to compress. As the inner slide head 64 continues to penetrate, after the reverse nut 63 is tightened to the correct position, the locking members 68 in the three sets of reserved cavities 65 in the inner slide head 64 also reach the correct position. The three sets of reserved grooves 9 are reached, the squeezing force of the inner sliding groove 62 is lost, and under the elastic restoring force of the three top springs 8, and the sliding limit cooperation of the guide rail groove 66 and guide rail block 67 on the three sets of locking parts 68, the three sets of locking parts 68 are forced to drive the locking teeth 69 through the three sets of reserved grooves 9 to reach the inner thread of the tightening nut 4, so as to achieve double reverse restriction on the tightening nut 4 to prevent the tightening nut 4 from loosening under force, and further improve the stability of the suspension installation between the expansion bolt and the home appliance; The diameter of the reverse screw head 61 is smaller than the diameter of the thread end of the expansion screw 1, which makes it easier to tighten the nut 4 by passing it through the smaller diameter reverse screw head 61 to the thread end of the expansion screw 1. The diameters of the tightening nut 4 and the reverse nut 63 are the same, and they abut against each other. The locking teeth 69 on the outer side of the three sets of locking parts 68 are opposite to the direction of the thread inside the tightening nut 4, which effectively prevents and limits the tightening nut 4. A top spring 8 is fixed between the three sets of locking parts 68 and the reserved cavity 65, which plays an elastic buffering and resetting role for the three sets of locking parts 68. A reserved groove 9 is provided at the thread end of the expansion screw 1 in a triangular equidistant shape to slide with the locking parts 68, which makes it easier for the three sets of locking parts 68 to rise and pass through the reserved groove 9 to reach the tightening nut 4.

[0024] like Figure 15As shown, after the appliance is suspended and installed using expansion bolts, the screw end will protrude, which not only allows dust to enter, but also makes the appliance susceptible to external environmental influences if it is installed outdoors, resulting in rust and corrosion, affecting the service life of the expansion bolts and lacking sealing and protection functions. The outer side of the screw end of the expansion bolt 1 is provided with a sealing component that operates synchronously with the locking component, and the sealing component includes a dust cap 71 fixed on the outside of the reverse nut 63. The reverse nut 63 synchronously drives the dust cap 71 to cover the exposed expansion bolt 1, anti-loosening washer 3, tightening nut 4 and reverse nut 63 with dust. A hexagonal tightening groove 72 is provided on the outer side of the dust cap 71 for use with a hexagonal wrench. A sealing groove 73 is provided on the inner side of the dust cap 71, and a sealing ring 74 is embedded in the sealing groove 73. Sealing adhesive 75 is placed inside the sealing ring 74. The sealing ring 74 in the sealing groove 73 seals the connection between the dust cap 71 and the appliance hanging bracket, and the sealing adhesive 75 on the sealing ring 74 adheres the dust cap 71 and the appliance hanging bracket tightly. This is not only aesthetically pleasing and dustproof, but also prevents rust on the exposed screw end of the outdoor appliance hanging point, extending the life of the expansion bolt.

[0025] The working principle of an expansion bolt for home appliance suspension: First, under the impact force of the expansion bolt being hammered into the drilled hole, the top pressure head 53, which is the first to be subjected to force, is forced to drive the top pressure rod 54 to slide in the sliding cavity 51 and compress the compression spring 55. Then, the top pressure rod 54 drives the pressure head 56 to press the three sets of positioning heads 57 outward through the pressure groove 58 and flatten the three sets of elastic rings 59. The three sets of positioning heads 57, which are subjected to continuous extrusion force, pass through the positioning hole 52 on the expansion screw 1 to the outside of the expansion sleeve 2 and stop and limit the movement against the inner wall of the drilled hole, thereby making a stable fit between the expansion screw 1 and the expansion sleeve 2 and the inner wall of the drilled hole. After the expansion screw 1 and expansion sleeve 2 are pressed into the drilled hole, first fit the hole on the appliance hanging bracket onto the threaded end of the expansion screw 1 that protrudes from the drilled hole. Then, sequentially fit the anti-loosening washer 3 and anti-loosening washer 12 onto the threaded end of the hanging bracket. Tighten the nut 4 to compress the anti-loosening washer 3 and anti-loosening washer 12. After the appliance hanging bracket and expansion bolt are fixed as a whole, first tighten the reverse nut 63 onto the reverse screw head 61, causing the inner slide head 64 inside to slide into the inner slide groove 62. During this process, the three sets of locking parts 68... The inner slide 62 continuously compresses the three top springs 8. As the inner slide head 64 continues to penetrate deeper, after the reverse nut 63 is tightened in place, the locking parts 68 in the three sets of reserved cavities 65 in the inner slide head 64 also reach the three sets of reserved grooves 9. They lose the compressive force of the inner slide 62, and under the elastic restoring force of the three top springs 8, and with the sliding limit cooperation of the guide rail groove 66 and guide rail block 67 on the three sets of locking parts 68, the three sets of locking parts 68 are forced to drive the locking teeth 69 through the three sets of reserved grooves 9 to reach the internal thread of the tightening nut 4, thereby achieving reverse restriction on the tightening nut 4. At the same time, following the tightening action of the reverse nut 63, the dust cap 71 on it is also driven to cover the exposed expansion screw 1, anti-loosening washer 3, tightening nut 4 and reverse nut 63 with dust and lock them onto the appliance hanging bracket. During this period, the dust cap 71 can be directly screwed to drive the reverse nut 63 to tighten and rotate, or a hexagonal tool can be inserted into the tightening groove 72 to drive the reverse nut 63 and dust cap 71 to tighten and rotate. After the reverse nut 63 and dust cap 71 are tightened in place, the sealing ring 74 in the sealing groove 73 seals the connection between the dust cap 71 and the appliance hanging bracket, and the sealant 75 on the sealing ring 74 adheres the dust cap 71 and the appliance hanging bracket.

[0026] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. An expansion bolt for hanging household appliances, comprising an expansion bolt (1), characterized in that: An expansion sleeve (2) is fitted on the outside of the expansion screw (1), and an anti-loosening washer (3) is fitted on the thread end of the expansion screw (1), and a tightening nut (4) is threadedly connected to it for tightening the expansion screw (1) and the expansion sleeve (2). In addition, the screw end of the expansion screw (1) is provided with a limiting component for limiting the expansion sleeve (2) to prevent it from falling off, and includes a sliding cavity (51) that is laterally opened in the screw end of the expansion screw (1). Both the expansion screw (1) and the expansion sleeve (2) are provided with positioning holes (52). The expansion screw (1) is provided with a locking assembly for the reverse restriction of tightening the nut (4) on the thread end, and includes a reverse screw head (61) fixed near the thread end of the expansion screw (1), and a reverse nut (63) for locking and preventing the nut (4) from being dislodged is threaded on the reverse screw head (61).

2. The expansion bolt for hanging household appliances according to claim 1, characterized in that: The limiting assembly also includes a top pressure head (53) embedded on the outside of the screw end of the expansion screw (1), and a top pressure rod (54) that slides with the sliding cavity (51) is fixed laterally on the inside of the top pressure head (53), and a compression spring (55) is sleeved on the top pressure rod (54), and a pressing head (56) is fixed in a triangular equidistant shape on the inside of the top pressure rod (54).

3. The expansion bolt for hanging household appliances according to claim 2, characterized in that: Positioning heads (57) slide inside the three sets of positioning holes (52), and the inner side of the positioning head (57) is provided with a pressing groove (58) that slides with the pressing head (56). An elastic ring (59) is provided between the expansion screw (1) and the expansion sleeve (2) for the positioning head (57) to elastically buffer and reset.

4. An expansion bolt for hanging household appliances according to claim 3, characterized in that: The height of the three sets of pressing heads (56) is distributed in a decreasing manner from the outside to the inside along the pressing groove (58) on the inner side of the positioning head (57). The inner side of the three sets of pressing heads (56) is fixed with a limiting head, and a limiting groove for the limiting head to stop and limit is opened on the inner side of the sliding cavity (51).

5. An expansion bolt for hanging household appliances according to claim 4, characterized in that: The locking assembly also includes an inner groove (62) opened in the reverse screw head (61), and an inner slide head (64) that slides and engages with the inner groove (62) is laterally fixed in the reverse nut (63), and a reserved cavity (65) opened in the inner end of the inner slide head (64) in a triangular equidistant shape, and guide rail grooves (66) are opened on both sides of the three reserved cavities (65).

6. An expansion bolt for hanging household appliances according to claim 5, characterized in that: The three sets of guide rail grooves (66) have guide rail blocks (67) sliding inside them, and the inner side of the three sets of guide rail blocks (67) is fixed with a locking member (68) that slides with the reserved cavity (65), and a locking tooth (69) for tightening the nut (4) in the opposite direction is provided on the outer side of the locking member (68).

7. An expansion bolt for hanging household appliances according to claim 6, characterized in that: The diameter of the reverse screw head (61) is smaller than the diameter of the thread end of the expansion screw (1), and the diameters of the tightening nut (4) and the reverse nut (63) are the same.

8. An expansion bolt for hanging household appliances according to claim 7, characterized in that: The locking teeth (69) on the outside of the three sets of locking parts (68) are opposite to the direction of the screw threads inside the tightening nut (4), and a top spring (8) is fixed between the three sets of locking parts (68) and the reserved cavity (65), and a reserved groove (9) for sliding with the locking parts (68) is provided at the screw thread end of the expansion screw (1) in a triangular equidistant shape.

9. An expansion bolt for hanging household appliances according to claim 8, characterized in that: The expansion sleeve (2) is fixed with a connector (10) in a triangular equidistant shape on the side near the tightening nut (4), and the inner side of the anti-loosening gasket (3) is provided with a mating groove (11) that engages with the connector (10).

10. An expansion bolt for hanging household appliances according to claim 9, characterized in that: An anti-loosening washer (12) is provided between the tightening nut (4) and the anti-loosening washer (3) and is fitted with the thread end of the expansion screw (1), and a protrusion (13) is fixed on the outer side of the expansion sleeve (2) near the tightening nut (4).

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