Switch panel base box and switch panel

Abstract

The present invention relates to a switch panel base box, which is prepared from a polypropylene resin system. The switch panel base box includes fixing holes and buffer components. The fixing holes penetrate from the front end face of the switch panel base box to the rear end face of the switch panel base box, and the buffer components are arranged in the fixing holes. The present invention also relates to a switch panel, which includes the above-mentioned switch panel base box.

Description

Technical Field

[0001] The present invention relates to the field of electrical appliances, and particularly to a switch panel bottom box and a switch panel including the switch panel bottom box. Background Art

[0002] The existing switch panel includes a switch panel bottom box and a switch panel upper cover. The switch panel upper cover and the switch panel bottom box can be connected by hard-connection type buckles, self-tapping installation, or magnetic attraction installation. The switch panel can be installed and fixed on a fixed point (such as a wall or a board) through the switch panel bottom box. Therefore, fixing holes are provided on the switch panel bottom box, and a connecting member (such as a screw) passes through the fixing holes to fix the switch panel bottom box on the fixed point.

[0003] For example, CN209266234U discloses a large panel switch panel with anti-breakdown screw holes. Screw holes are provided on the large panel switch panel, and a groove-shaped recess is provided inside the screw holes (the groove-shaped recess in the screw holes replaces the gasket). The screw holes can be regarded as the fixing holes. Another example is that CN212182177U discloses a switch panel upper cover and a switch panel housing structure. A plurality of second limiting holes for installing embedded box bolts are provided on the switch panel bottom box of the switch panel housing structure, and the second limiting holes can be regarded as the fixing holes.

[0004] The existing switch panel bottom boxes are generally made of rigid plastics (such as polycarbonate). From the perspective of reducing the manufacturing difficulty and cost, semi-rigid or flexible materials (such as polyethylene, polypropylene, thermoplastic elastomer TPE, etc.) are used to replace rigid plastics to manufacture switch panels. However, the following technical problems are found: When the switch panel bottom box made of polypropylene resin is installed and fixed, the connecting member is likely to penetrate the fixing hole of the switch panel bottom box, making the switch panel bottom box unable to be fixed on the fixed point.

[0005] Research on the existing switch panel bottom boxes made of polypropylene resin yields the following knowledge:

[0006] 1. Since the polypropylene resin has a low hardness (≤70N / mm 2 ), the hardness of the manufactured switch panel bottom box is insufficient. Therefore, when the manufactured switch panel bottom box is installed, an operator uses a power tool (such as BOSCH ® GBM 345) to pass the connecting member through the fixing hole of the switch panel bottom box. During this process, due to the impact force exerted by the power tool, the connecting member is likely to damage the switch panel bottom box;

[0007] 2. The use of buffer components (such as gaskets or washers) can prevent the switch panel bottom box made of polypropylene-based resin from being penetrated by the connecting piece. However, most of the existing buffer components are made of flexible or semi-flexible materials to play a buffering role. These materials can include, but are not limited to, rubber, such as natural rubber, and / or nitrile rubber, and / or neoprene, and / or silicone, and / or fluorosilicone resin and / or fluorocarbon, and / or perfluoroelastomer, and / or polyurethane, and / or thermoplastic elastomer, such as ethylene-propylene and / or thermoplastic vulcanizate, and / or thermoplastic, such as polypropylene, and / or polyethylene and / or foam, such as foamed polyvinyl chloride, and / or foamed nitrile rubber, and / or foamed polyurethane, etc.;

[0008] 3. In the actual installation scenario, the buffer component is packaged separately from the switch panel bottom box. Before installing and fixing the switch panel bottom box, it is necessary to pre-sleeve the buffer component on the outside of the connecting piece in advance. This results in the situation that the buffer component is extremely likely to be lost during the transportation and storage of the switch panel product. And the buffer component needs to match the fixing hole structure of the switch panel bottom box. Therefore, the switch panel bottom box cannot be installed and fixed after the buffer component is lost.

[0009] Term Explanation

[0010] In the present invention, unless otherwise specified, the "hardness" recorded refers to the Martens hardness. The Martens hardness represents the hardness (indentation difficulty) of the material obtained from the test load (1 mN) when using a Vickers indenter to press into the material surface and the indented surface area, and is used as the hardness index of the material. The Martens hardness can be measured by a supermicrohardness testing device according to the method of ISO-14577-1. The smaller the Martens hardness, the softer the material. The environmental temperature for Martens hardness testing is 20 °C and the relative humidity is 50% RH.

[0011] In the present invention, unless otherwise specified, the "elastic deformation rate" refers to the measurement according to the method of ISO-14577-1. Specifically, it is the work done (total work Wt) when applying a specified load to the measurement object, and the work done (plastic deformation work Wp) when returning the load of the indenter to 0 mN after a certain holding time, and the elastic deformation rate is obtained. The calculation formula is [elastic deformation rate] = (Wt - Wp) / Wt.

[0012] In the present invention, unless otherwise specified, the "creep rate" refers to the value measured according to the method of ISO-14577-1. Specifically, it is obtained from the indentation depth (h1) at the time of reaching the load weight and the indentation depth (h2) after a certain holding time, and calculated by the formula: [Creep rate] = { (h2 - h1) / h1} × 100%. There is a correlation between the creep rate and the elastic deformation rate. The higher the elastic deformation rate, the lower the creep rate.

[0013] The "self-healing property" described in the present invention refers to the property that once a dent (depression) occurs, the trace of the dent (depression) will disappear over time and return to its original shape (recovery). Summary of the Invention

[0014] The present invention aims to provide a switch panel bottom box, which is made of polypropylene-based resin. At the same time, a buffer member is provided in the fixing hole of the switch panel bottom box, so as to prevent the switch panel bottom box from deforming, denting or cracking when a connecting member penetrates through the fixing hole to fix and install the switch panel bottom box.

[0015] To achieve the above object, the present invention adopts the following technical solution: A switch panel bottom box is made of polypropylene-based resin, and the switch panel bottom box includes a fixing hole and a buffer member. The buffer member is arranged in the fixing hole.

[0016] The fixing hole of the switch panel bottom box penetrates from the front end face of the switch panel bottom box to the rear end face. The fixing hole of the switch panel bottom box includes a first hole and a second hole. The first hole and the second hole are communicated with each other, and the aperture of the first hole is larger than that of the second hole. The orifice of the first hole is located on the front end face of the switch panel bottom box, and the orifice of the second hole is located on the rear end face of the switch panel bottom box. When fixing the switch panel bottom box, the connecting member enters from the orifice of the first hole and penetrates out from the orifice of the second hole.

[0017] Preferably, the center line of the first hole and the center line of the second hole are on the same straight line.

[0018] For the convenience of description, the connecting end face of the first hole and the second hole is called the "support end face". The buffer member contacts the support end face.

[0019] The buffer member includes an annular block and a clamping rod. The annular block is located in the first hole and the bottom end face of the annular block contacts and abuts against the support end face. One end of the clamping rod is connected to the bottom end face of the annular block, and the end of the clamping rod away from the annular block is clamped and connected to the orifice of the second hole.

[0020] The aperture of the inner hole of the annular block is slightly larger than the aperture of the second hole, and the maximum width of the annular block is slightly smaller than the aperture of the first hole. The number of the clamping rods is greater than 1. One end of each clamping rod is connected to the bottom end face of the annular block, and a hook is arranged at the other end of each clamping rod. The clamping rods are circumferentially distributed around the central line of the annular block, and there is a gap between adjacent clamping rods. The hook protrudes towards a direction away from the central line of the annular block to form a convex part.

[0021] In one embodiment, the number of the clamping rods is 2, and the two clamping rods are arranged in a mirror image with the central line of the annular block as the axis.

[0022] In one embodiment, the number of the clamping rods is 4, and the four clamping rods are evenly circumferentially arranged around the central line of the annular block.

[0023] Preferably, the central line of the annular block, the central line of the first hole, and the central line of the second hole are on the same straight line.

[0024] The buffer member is installed in the fixed hole in the following manner: The buffer member enters the first hole from the orifice of the first hole, and the clamping rods of the buffer member face the second hole. The maximum width between the hooks of the clamping rods is greater than the aperture of the second hole but smaller than the aperture of the first hole. During the process of the buffer member moving towards the second hole, since the part of the convex part on the hook that first contacts the second hole is an arc structure or an inclined surface structure, when the clamping rods of the buffer member contact the second hole, the hooks gather towards the central line of the annular block and enter the second hole until the hooks are pushed out from the orifice of the second hole. At this time, the hooks return to the initial state, the convex part on the hooks is in clamping fit with the orifice of the second hole, and the bottom end face of the annular block contacts and abuts against the supporting end face of the first hole. Thus, the buffer member is firmly fixed in the fixed hole.

[0025] In one embodiment, a concave notch is arranged at the edge of the orifice of the second hole. The notch is regarded as an abutting part, and the number of the abutting parts is the same as the number of the clamping rods. The convex part on the hook is in clamping fit with the abutting part to achieve clamping connection.

[0026] In one embodiment, an annular protrusion is arranged at one end of the inner part of the second hole close to the orifice. The annular protrusion is regarded as an abutting part, and the convex part on the hook is in clamping fit with the abutting part to achieve clamping connection.

[0027] In one embodiment, a concave annular groove is circumferentially arranged at the edge of the orifice of the second hole. The convex part on the hook is inserted into the annular groove to achieve clamping connection.

[0028] In the present invention, fixing the buffer member in the fixing hole can achieve at least the following beneficial effects:

[0029] 1. The buffer member matches the fixing hole, and the buffer member is fixed in the fixing hole, preventing the switch panel bottom box from not being fixed due to the loss of the buffer member;

[0030] 2. During the installation of the switch panel bottom box, when the connecting member passes through the fixing hole, it will contact the buffer member. The buffer member can significantly reduce the impact damage of the connecting member on the fixing hole, thereby preventing the fixing hole from being penetrated.

[0031] To achieve the above beneficial effects, it depends on the connection structure between the buffer member and the fixing hole and the body performance of the buffer member. Therefore, the following constraints need to be imposed on the performance of the buffer member:

[0032] 1. From the perspective of protecting the fixing hole, the hardness of the buffer member needs to meet ≥100N / mm 2 , if the hardness of the buffer member is less than 100N / mm 2 There will be a situation where the buffer member is damaged by the impact of the connecting member. To further improve the protection of the fixing hole by the buffer member, the thickness of the annular block of the buffer member is at least 1 / 4 of the hole depth of the first hole;

[0033] 2. From the perspective of the assembly of the buffer member and the fixing hole, the elastic deformation rate of the buffer member needs to meet ≥70%. At this time, during the assembly of the buffer member and the fixing block, the clamping rod can also return to its original state after deformation. If the elastic deformation rate of the buffer member is less than 70%, there will be a situation where the clamping hook and the fixing hole are not firmly engaged due to the clamping rod of the buffer member not returning to its original state after deformation;

[0034] 3. From the perspective that the buffer member will not deform when receiving the impact of the connecting member, the creep rate of the buffer member needs to meet ≤2%.

[0035] It was unexpectedly found that when the material for preparing the buffer member meets the following conditions, the body performance of the buffer member can meet the above requirements:

[0036] 1. Containing 95-100wt% of polycarbonate resin;

[0037] 2. Containing 0-5wt% of soft resin, and the Martens hardness of the soft resin is 0.1-70N / mm 2And it has self-healing properties. Examples of the soft resin include acrylic resin compositions, unsaturated polyurethane resin compositions such as urethane-modified (meth)acrylate, unsaturated polyester resin compositions, thermosetting silicone-based, melamine-based, and epoxy-based resin compositions, etc.

[0038] It was unexpectedly found that the buffer member prepared by mixing polycarbonate resin and the soft resin can improve the impact resistance and increase the elastic deformation rate.

[0039] Preferably, the soft resin is an acrylic resin. For example, it can include (meth)acrylate (co)polymers, copolymers containing a copolymerizable monomer group of (meth)acrylate, and modified products thereof, etc. Furthermore, the so-called (meth)acrylic group means an acrylic group or a methacrylic group. And the so-called (co)polymer means a polymer or a copolymer. As the above-mentioned (meth)acrylate (co)polymers, for example, poly(methyl)acrylate, poly(ethyl)acrylate, poly(propyl)acrylate, poly(butyl)acrylate, (methyl)acrylate-methyl (butyl)acrylate copolymer, and (ethyl)acrylate-(butyl)acrylate copolymer, etc. As the copolymers containing a copolymerizable monomer group of (meth)acrylate, for example, ethylene-(methyl)acrylate copolymer, styrene-(methyl)acrylate copolymer, vinylcyclohexane-(methyl)acrylate copolymer, maleic anhydride-(methyl)acrylate copolymer, and N-substituted maleimide-(methyl)acrylate copolymer, etc. As the above-mentioned modified products, for example, polymers into which a lactone ring structure is introduced by an intramolecular cyclization reaction, polymers into which glutaric anhydride is introduced by an intramolecular cyclization reaction, and polymers into which an imide structure is introduced by reaction with an imidizing agent (such as methylamine, cyclohexylamine, ammonia, etc.). As the above-mentioned acrylic resin, one or a mixture of two or more of these can be used.

[0040] More preferably, the soft resin is a core-shell rubber in the acrylic resin. Examples of the above-mentioned core-shell rubber include methyl acrylate-styrene / butadiene rubber graft copolymer, acrylonitrile-styrene / butadiene rubber graft copolymer, acrylonitrile-styrene / ethylene-propylene rubber graft copolymer, acrylonitrile-styrene / acrylic ester graft copolymer, methyl acrylate / acrylic ester rubber graft copolymer, methyl acrylate-acrylonitrile / acrylic ester rubber graft copolymer, etc. As the above-mentioned core-shell rubber, one or a mixture of two or more of these can be used.

[0041] On the other hand, the present invention also provides a switch panel, which includes the above-mentioned switch panel bottom box. The switch panel further includes a switch panel upper cover, and the material for preparing the switch panel upper cover can be the same as or different from the material for preparing the switch panel bottom box.

[0042] The following is a description with reference to specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The accompanying drawings further illustrate the present invention, but the embodiments in the drawings do not constitute any limitation to the present invention.

[0044] Figure 1 FIG. is a schematic structural diagram of the switch panel base box provided in Embodiment 1 of the present invention (observed from the front end face);

[0045] Figure 2 FIG. is a schematic structural diagram of the switch panel base box provided in Embodiment 1 of the present invention (observed from the rear end face);

[0046] Figure 3 FIG. is a schematic structural diagram of the switch panel base box provided in Embodiment 1 of the present invention after removing the buffer assembly;

[0047] Figure 4 FIG. is a schematic structural diagram of the buffer assembly provided in Embodiment 2 of the present invention;

[0048] Figure 5 FIG. is a schematic structural diagram of the switch panel base box provided in Embodiment 3 of the present invention after removing the buffer assembly (observed from the front end face);

[0049] Figure 6 FIG. is a schematic structural diagram of the switch panel base box provided in Embodiment 3 of the present invention after removing the buffer assembly (observed from the rear end face);

[0050] Figure 7 FIG. is a schematic structural diagram of the buffer assembly provided in Embodiment 3 of the present invention.

[0051] Among them, the reference numerals are: 1. Body; 2. Accommodating groove; 3. Fixing hole; 31. First hole; 32. Second hole; 321. Notch; 33. Third hole; 331. Engaging block; 4. Buffer assembly; 41. Ring block; 42. Clamping rod; 421. Hook; 422. Convex part. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0052] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0053] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0054] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected" and "coupled" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection, a direct connection or an indirect connection through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than that of the second feature.

[0056] It should be noted that the following is an example of the manufacturing method of the switch panel bottom box provided by the embodiment of the present invention.

[0057] Step 1: Prepare high-flow general-purpose polypropylene resin material pellets, and then inject the molten propylene resin material into the cavity of the injection molding die to form a switch panel bottom box without a buffer component. During the forming process, apply pressure and maintain for a specified time at a specified temperature. Since the temperature of the die is set at a temperature at which the polypropylene resin does not melt, the switch panel bottom box will not be deformed by the heat, so it is difficult to generate deformation during forming, and the size of the formed switch panel bottom box is stable.

[0058] Step 2: Melt the resin material for preparing the buffer component and pour it into the cavity of the injection mold from the gate. Next, perform a secondary curing treatment in the injection mold. For example, by heating at a temperature of 120 °C for 10 minutes, it has the effect of stabilizing the formed buffer component by stress relaxation.

[0059] Step 3: Deburr in the finishing process.

[0060] Step 4: Push the buffer component into the fixing hole of the switch panel bottom box until the buffer component is fixed in the fixing hole of the switch panel bottom box, and the buffer component is simply and reliably connected to the fixing hole.

[0061] Example 1

[0062] As Figure 1 and Figure 2 shown, the switch panel bottom box provided in this example includes a body 1, a receiving groove 2, and a fixing hole 3. A buffer component 4 is provided in the fixing hole 3. The receiving groove 2 is used to receive the conductive component and the elastic component of the switch panel. The fixing hole 3 is provided on both sides of the receiving groove 2. The fixing hole 3 penetrates from the front end face of the body 1 (attached Figure 1 with a) to the rear end face of the body 1 (attached Figure 2 with b). A screw penetrates the fixing hole 3 from the orifice of the fixing hole 3 on the front end face of the body 1 to fix the switch panel bottom box.

[0063] As Figure 1 , Figure 2 and Figure 3 shown, the fixing hole 3 includes a first hole 31 and a second hole 32. The first hole 31 and the second hole 32 communicate with each other, and the aperture of the first hole 31 is larger than the aperture of the second hole 32. The orifice of the first hole 31 is located on the front end face of the body 1, and the orifice of the second hole 32 is located on the rear end face of the body 1. The center line of the first hole 31 and the center line of the second hole 32 are on the same straight line. The connecting end face of the first hole 31 and the second hole 32 is called the "support end face". Two concave notches 321 are provided at the edge of the orifice of the second hole 32, and the notches 321 are regarded as abutting parts. The two notches 321 are symmetrically arranged with the center line of the second hole 32 as the axis.

[0064] Example 2

[0065] As Figure 4 shown, this embodiment provides a buffer member 4. The buffer assembly 4 includes a buffer member including an annular block 41 and a clamping rod 42. The number of the clamping rods 42 is 2. One end of the clamping rod 42 is connected to the bottom end surface of the annular block 41, and the two clamping rods 42 are arranged in a mirror image with the central axis of the annular block 41 as the axis. A hook 421 is provided at the other end of the clamping rod 42, and a convex portion 422 protrudes from the hook 421 in a direction away from the central axis of the annular block 41. One end of the convex portion 422 away from the annular block 41 is an inclined surface.

[0066] The buffer member 4 provided in this embodiment is prepared from polycarbonate resin.

[0067] As Figure 1 and Figure 2 shown, the buffer member 4 provided in this embodiment is arranged in the fixing hole 3 of the switch panel bottom box provided in Example 1. The buffer member 4 provided in this embodiment is assembled into the fixing hole 3. The buffer member 4 is pushed into the fixing hole 3 from the orifice of the first hole 31 to complete the assembly. During this process, the hooks 421 first gather and narrow in width and enter the second hole 32, and then the hooks 421 extend out of the orifice of the second hole 32 and expand to cooperate and engage with the notch 321. After the buffer member 4 and the switch panel bottom box are assembled, the annular block 41 is located in the first hole 31 and the bottom end surface of the annular block 41 contacts and abuts against the supporting end surface of the first hole 31, and the convex portion 422 on the hook 421 is in clamping fit with the abutting portion to realize the clamping connection.

[0068] The buffer assembly 4 is connected in the fixing hole 3. Therefore, when using a screw to fix the switch panel bottom box, the screw passing through the fixing hole 3 will contact the annular block 41 of the buffer assembly 4 and apply an impact force. The buffer assembly 4 can protect the fixing hole 3 and prevent the fixing hole 3 from being penetrated by the screw.

[0069] Example 3

[0070] As Figure 5 and Figure 6 shown, the switch panel bottom box provided in this embodiment includes a body 1, a receiving groove 2 and a fixing hole 3. The receiving groove 2 is used to receive the conductive member and the elastic member of the switch panel. The fixing holes 3 are provided on both sides of the receiving groove 2. The fixing holes 3 penetrate from the front end surface of the body 1 (attached Figure 5 with a) to the rear end surface of the body 1 (attached Figure 6In b) thereof. The screw passes through the fixing hole 3 from the orifice of the fixing hole 3 located on the front end face of the body 1 to fix the switch panel bottom box. The fixing hole 3 includes a first hole 31, a second hole 32 and a third hole 33. The first hole 31 and the second hole 32 communicate with each other, and the first hole 31 and the third hole 33 communicate with each other. The aperture of the first hole 31 is larger than that of the second hole 32. The orifice of the first hole 31 is located on the front end face of the body 1, and the orifices of the second hole 32 and the third hole 33 are both located on the rear end face of the body 1. The center line of the first hole 31 and the center line of the second hole 32 are on the same straight line, and the four third holes 33 are evenly circumferentially arranged around the center line of the second hole 32. The connecting end face of the first hole 31 with the second hole 32 and the third hole 33 is called the "support end face". A clamping block 331 is provided at the edge of the orifice of the third hole 33, and the clamping block 331 is regarded as an abutting portion.

[0071] Embodiment 4

[0072] The buffer component 4 provided in this embodiment is as Figure 7 shown. The difference between the buffer component 4 provided in this embodiment and the buffer component 4 provided in Embodiment 2 is only that: the number of clamping rods 42 of the buffer component 4 provided in this embodiment is 4, and the four clamping rods 42 are evenly circumferentially arranged around the center line of the annular block 41.

[0073] The buffer component 4 provided in this embodiment is arranged in the fixing hole 3 of the switch panel bottom box provided in Embodiment 3. The buffer component 4 provided in this embodiment is assembled into the fixing hole 3. The buffer component 4 is pushed into the fixing hole 3 from the orifice of the first hole 31 to complete the assembly. During this process, the four clamping rods 42 respectively enter the four third holes 33, and then the convex portion 422 on the clamping hook 421 cooperates with the clamping block 331 for clamping. After the buffer component 4 and the switch panel bottom box are assembled, the annular block 41 is located in the first hole 31 and the bottom end face of the annular block 41 contacts and abuts against the support end face of the first hole 31, and the convex portion 422 on the clamping hook 421 is clamped and matched with the clamping block 331 to realize the clamping connection.

[0074] The buffer assembly 4 is connected in the fixing hole 3. Therefore, when using a screw to fix the switch panel bottom box, the screw passing through the first hole 31 and the second hole 32 will contact the annular block 41 of the buffer assembly 4 and exert an impact force. The buffer assembly 4 can protect the fixing hole 3 and prevent the fixing hole 3 from being penetrated by the screw.

[0075] Embodiment 5

[0076] This embodiment provides a buffer component. The difference between the buffer component provided in this embodiment and the buffer component provided in Embodiment 2 is only that: the preparation material of the buffer component provided in this embodiment includes 95 wt% of polycarbonate resin and 5 wt% of methyl methacrylate-butadiene rubber graft copolymer.

[0077] Embodiment 6

[0078] This embodiment provides a buffer component. The difference between the buffer component provided in this embodiment and the buffer component provided in Embodiment 2 is only that: the preparation material of the buffer component provided in this embodiment includes 99 wt% of polycarbonate resin and 1 wt% of acrylonitrile-styrene rubber graft copolymer.

[0079] Embodiment 7

[0080] This embodiment provides a buffer component. The difference between the buffer component provided in this embodiment and the buffer component provided in Embodiment 2 is only that: the preparation material of the buffer component provided in this embodiment includes 97 wt% of polycarbonate resin and 3 wt% of acrylate rubber graft copolymer.

[0081] Comparative Example 1

[0082] This comparative example provides a buffer component. The difference between the buffer component provided in this comparative example and the buffer component provided in Embodiment 2 is only that: the buffer component provided in this comparative example is only an annular block, and the annular block is made of polycarbonate resin.

[0083] Comparative Example 2

[0084] This comparative example provides a buffer component. The difference between the buffer component provided in this comparative example and the buffer component provided in Embodiment 2 is only that: the preparation material of the buffer component provided in this comparative example includes 80 wt% of polycarbonate resin and 20 wt% of methacrylate-butadiene rubber graft copolymer.

[0085] Comparative Example 3

[0086] This comparative example provides a buffer component. The difference between the buffer component provided in this comparative example and the buffer component provided in Embodiment 2 is only that: the preparation material of the buffer component provided in this comparative example includes 50 wt% of polycarbonate resin and 50 wt% of methacrylate-butadiene rubber graft copolymer.

[0087] [Performance Test]

[0088] Under the environment of an ambient temperature of 20 °C and a relative humidity of 50% RH, through an ultra-micro hardness testing device (trade name: FISCHERSCOPE HM2000, Fischer Instruments), according to the method of ISO-14577-1, the hardness, creep rate, and elastic deformation rate of the buffer components provided in Embodiments 2-6 and Comparative Examples 2-3 are measured. Among them, the hardness of the buffer component is randomly sampled and tested on the annular block of the buffer component, and the creep rate and elastic deformation rate are both randomly sampled and tested on the clamping rod of the buffer component.

[0089] Test parameters: The indenter used is a diamond Vickers indenter, the load is 1 mN, the indentation load time is 20 seconds, the holding time is 5 seconds, and the unloading condition is 20 seconds. The measured hardness is the value measured at 1 mN. The results of the performance test are shown in Table 1.

[0090] According to the test results, it can be judged that the performance of the buffer components provided in Example 2 and Examples 4-7 can meet the protection requirements for the fixing holes of the switch panel bottom box made of polypropylene resin material.

[0091] Table 1

[0092]

[0093] [Impact resistance test]

[0094] The product assembled with the buffer component 4 provided in Example 2 and the switch panel bottom box provided in Example 1 is marked as sample a;

[0095] Take the switch panel bottom box provided in Example 1, and adhere the annular block provided in Comparative Example 1 to the supporting end face of the fixing hole of the switch panel bottom box using acrylic adhesive resin, and mark it as sample b.

[0096] Take the switch panel bottom box provided in Example 1, and heat and press the annular block provided in Comparative Example 1 on the supporting end face of the fixing hole of the switch panel bottom box using a hot pressing tool (the hot pressing temperature brought by the hot pressing tool is about 150-180 °C), and mark it as sample c.

[0097] Use a drop tester (Shinyei Technology Co., Ltd., Kobe, Japan). Let samples a, b, and c stay at room temperature for 24 hours before testing. Then let the samples fall from 3 different heights until the assembly separates (fails). The results are reported as the number of drops from 3 different heights: 1.0 m (up to 30 drops), then 1.2 m (up to 30 drops), and then 2.0 m (up to 30 drops). The total number of drops from all three heights is used to characterize the impact resistance of the adhesive. A total number of drops greater than 40 is considered good impact resistance. A total number of drops less than 20 is considered poor impact resistance. When the total number of drops is between 20 and 40, it is considered reasonable impact resistance.

[0098] The test results are: The total number of drops of sample a is 74 times, and the impact resistance is good; the total number of drops of sample b is 28 times; the total number of drops of sample c is 44 times. The test results show that the structure connecting the buffer component in the fixing hole of the switch panel bottom box provided by the present invention can achieve the most excellent impact resistance.

[0099] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0100] The above-described embodiments merely represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A switch panel bottom box, characterized in that: The switch panel bottom box is made of polypropylene resin. The switch panel bottom box includes fixing holes and buffer components. The fixing holes penetrate from the front end face of the switch panel bottom box to the rear end face of the switch panel bottom box, and the buffer components are arranged in the fixing holes; The fixing holes of the switch panel bottom box include a first hole and a second hole. The first hole and the second hole are communicated with each other, and the aperture of the first hole is larger than that of the second hole. The orifice of the first hole is located on the front end face of the switch panel bottom box, and the orifice of the second hole is located on the rear end face of the switch panel bottom box; The center line of the first hole and the center line of the second hole are on the same straight line, and the connecting end face of the first hole and the second hole is a supporting end face; The buffer component includes an annular block and a clamping rod. The annular block is located in the first hole, and the bottom end face of the annular block contacts and abuts against the supporting end face. One end of the clamping rod far away from the annular block is clamped and connected to the orifice of the second hole; The number of the clamping rods is greater than 1. The clamping rods are circumferentially distributed around the center line of the annular block, and there is a gap between adjacent clamping rods. A clamping hook is arranged at one end of the clamping rod far away from the annular block, and a convex part protrudes from the clamping hook in a direction away from the center line of the annular block; The center line of the annular block, the center line of the first hole and the center line of the second hole are on the same straight line; An inward concave notch is arranged at the edge of the orifice of the second hole. The number of the notches is the same as that of the clamping rods, and the convex part on the clamping hook is clamped and connected with the notch; The material for preparing the buffer member comprises 95-100 wt% of a polycarbonate resin and 0-5 wt% of a soft resin, and the Martens hardness of the soft resin is 0.1-70 N / mm 2 and has self-healing properties, and the soft resin is a core-shell rubber.

2. A switch panel, characterized in that, Including the switch panel bottom box according to claim 1.

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