Anti-cracking flashlight tail cover, flashlight and manufacturing process of anti-cracking flashlight tail cover

Abstract

The invention provides an anti-cracking flashlight tail cover, a flashlight and a manufacturing process thereof.The flashlight tail cover is used for being connected to a flashlight body and comprises a cover body, the cover body is provided with a sealing surface, a sealing groove surrounding the center axis of the cover body is formed in the sealing surface, and a sealing ring is arranged in the sealing groove; a receding annular groove is formed between the sealing surface and the notch in the end of the cylinder body, and the groove width of the receding annular groove is larger than 0.3 mm. Wherein the cover body is a hard cover body formed by mixed injection molding of polycarbonate and glass fibers. The problem that in the prior art, a tail cover of a manual cylinder is low in structural strength and prone to cracking and damage is solved.

Description

Technical Field

[0001] The present application relates to the technical field of lighting equipment, and more specifically, to a crack-resistant flashlight tail cover, a flashlight, and a manufacturing process thereof. Background Art

[0002] An LED high-intensity flashlight is a high-brightness lighting tool that uses a light-emitting diode (LED) as its light source. It offers advantages such as energy efficiency, durability, high brightness, and a long lifespan, making it widely used in various scenarios requiring high-intensity lighting. It generates high-brightness light by driving the LED light beads through an electric current. Compared to traditional incandescent or halogen flashlights, LED high-intensity flashlights offer higher luminous efficiency, lower power consumption, a longer lifespan, and improved durability.

[0003] Existing flashlights typically consist of a body and a tail cap, with the lamp head located at one end of the body and the tail cap attached to the other. Screws secure the tail cap to the body and seal the internal components of the body. To improve the flashlight's user comfort and reduce its weight, the body and tail cap must be made of lightweight materials. This results in the tail cap's poor strength during use, making it susceptible to deformation from localized stress from the screws and from contact with the body, affecting its appearance. The tail cap also serves as the flashlight's charging terminal. When charging, the tail cap faces downward, bearing the weight of the entire flashlight. Long-term concentrated pressure can cause cracking and damage, rendering the flashlight unusable and impossible to charge.

[0004] Therefore, the existing technology still needs to be improved and developed. Summary of the Invention

[0005] The purpose of the present application is to provide a crack-resistant flashlight tail cover, a flashlight and a manufacturing process thereof, which solves the problem that the tail cover of a manual flashlight in the prior art has low structural strength and is prone to cracking and damage.

[0006] To achieve the above objectives, the technical solution adopted in this application is:

[0007] In one aspect, the present application provides a crack-resistant tail cap for a flashlight, for connection to a flashlight body, wherein the tail cap comprises: a cover body, the cover body having a sealing surface, a sealing groove formed on the sealing surface and surrounding a central axis of the cover body, a sealing ring disposed in the sealing groove, a gap between the sealing surface and an end notch of the flashlight body, and a groove width of the gap greater than 0.3 mm;

[0008] The cover is a hard cover made of a mixed injection molding of polycarbonate and glass fiber.

[0009] Optionally, the groove width X of the air-avoiding ring groove is greater than or equal to 1.3 mm.

[0010] Optionally, the sealing surface includes a first surface and a second surface, the first surface is arranged on a side of the sealing groove facing the central axis, and the second surface is arranged on a side of the sealing groove facing away from the central axis;

[0011] In the height direction, the first surface is arranged to protrude from the second surface;

[0012] The first surface is used to abut against the end surface of the barrel, so that an accommodating gap is formed between the end surface of the barrel and the second surface.

[0013] Optionally, the groove width of the air-avoiding ring groove is X=0.3+0.8 / C, where C is the radial width of the second surface.

[0014] Optionally, a first ring platform is provided on the first surface, the first ring platform protrudes from the notch of the sealing groove, and the top of the first ring platform has a first arched bearing surface, and the first arched bearing surface is used to abut against the inner end surface of the barrel;

[0015] Inner and outer sides of the first ring platform are arranged as inclined inner wall surfaces, and the inclined inner wall surfaces are connected to the first arched bearing surface.

[0016] Optionally, a second ring platform is provided on the second surface, and the second ring platform is located at the outer edge of the sealing surface;

[0017] The second annular platform has a second arched bearing surface, and the second arched bearing surface is located in the air-avoiding annular groove.

[0018] Optionally, the mass proportion of polycarbonate in the hard cover is 50%-80%, and the mass proportion of glass fiber is 20%-50%.

[0019] On the other hand, the present application also provides a flashlight, comprising a body and the above-mentioned tail cap, wherein an end notch is formed on the outer wall of the end of the body;

[0020] A sealing ring is arranged in the sealing groove of the tail cover of the flashlight. The tail cover of the flashlight is connected to the barrel through a fastener, and the end face of the barrel rests on the sealing surface of the tail cover of the flashlight and squeezes the sealing ring.

[0021] In a third aspect, the present application further proposes a manufacturing process for a crack-resistant flashlight tail cover, which is applied to the above-mentioned crack-resistant flashlight tail cover, wherein the manufacturing process comprises the following steps:

[0022] uniformly stirring the raw materials according to a proportion, wherein the raw materials include polycarbonate and glass fiber;

[0023] Bake the mixed ingredients;

[0024] The dried raw materials are placed in an injection molding machine to melt the materials, and injection molding is performed in a base mold to obtain a tail cover injection molded part;

[0025] Inspect the tail cap injection molded parts, remove the flash and cut off the sprue position of the qualified tail cap injection molded parts to obtain the tail cap single piece;

[0026] Annealing the tail cover piece and cooling it after annealing to obtain a finished tail cover;

[0027] Mark the finished tail caps and put them into storage.

[0028] Optionally, in the step of uniformly stirring the raw materials in proportion, wherein the raw materials include polycarbonate and glass fiber:

[0029] The raw materials are composed of 70% polycarbonate and 30% glass fiber.

[0030] Optionally, the steps of inspecting the tail cap injection molded parts, removing the flash and cutting off the sprue position of the tail cap injection molded parts that have passed the inspection, and obtaining the tail cap single piece specifically include:

[0031] Select the flashlight tail cover configuration file on the injection molding machine, and after confirming that the heating conditions meet the standards, start melting the raw materials;

[0032] Press the base spring piece onto the pre-prepared tooling, manually control the injection molding machine to insert the tooling with the base spring piece into the corresponding slot of the base mold, and hit the tooling with a hardware knocker until there is no gap between the tooling and the slot;

[0033] The injection molding machine is semi-automatically controlled so that the injection molding machine program automatically controls the base mold to close the mold and then perform injection molding;

[0034] After the scheduled injection time, the injection molding machine program automatically controls the base mold to open and automatically removes the nozzle parts and indicator light shield;

[0035] Remove the molded tail cover injection molded part and tooling from the groove cavity of the base mold.

[0036] The present application provides a crack-resistant flashlight tail cover, a flashlight, and a manufacturing process thereof, which have at least the following beneficial effects: when the cover is connected to the barrel, a clearance ring groove is formed between the sealing surface of the cover and the end notch of the barrel, so that the width of the clearance ring groove is increased to more than 0.3 mm. Thus, when the flashlight tail cover is deformed by the screw or deformed in a hot environment, the width spacing of the clearance ring groove is greater than the deformation of the cover. Even after the cover is deformed, there is still a gap in the clearance ring groove. In this way, after the cover is deformed, it is difficult for the cover to contact the end notch of the barrel, thereby avoiding mutual compression and pressure that causes the tail cover to crack. In addition, the hard cover is formed by mixed injection molding of polycarbonate and glass fiber, which enhances the structural strength of the flashlight tail cover while maintaining a low weight. The cost of the injection molding production process is not significantly increased, and the appearance of the flashlight tail cover is also improved. Thus, the flashlight tail cover is not easy to crack or damage during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0038] Figure 1 A schematic structural diagram of a crack-resistant tail cover for a flashlight provided in an embodiment of the present application;

[0039] Figure 2 A cross-sectional view of an anti-cracking tail cap of a flashlight provided in an embodiment of the application;

[0040] Figure 3 for Figure 2 A magnified view of point A;

[0041] Figure 4 A partial cross-sectional view of another structure of a crack-resistant tail cover for a flashlight provided in an embodiment of the present application;

[0042] Figure 5 A partial cross-sectional view of a third structure of a crack-resistant tail cover for a flashlight provided in an embodiment of the present application;

[0043] Figure 6 A flowchart of the main steps of a manufacturing process for a crack-resistant flashlight tail cap provided in an embodiment of the present application;

[0044] Figure 7 This is a flowchart of the detailed steps of step S300 of a manufacturing process for a crack-resistant flashlight tail cover provided in an embodiment of the present application.

[0045] Among them, the reference numerals in the figures are:

[0046] 100. Tail cover of the flashlight; 110. Cover body; 111. Limiting ring; 120. Sealing surface; 121. Sealing groove; 122. First surface; 123. Second surface; 124. Accommodating gap; 130. Sealing ring; 140. First annular platform; 141. First bow-shaped bearing surface; 142. Inclined inner wall surface; 150. Second annular platform; 151. Second bow-shaped bearing surface; 200. Body; 210. End notch; 220. Air-avoiding annular groove. DETAILED DESCRIPTION

[0047] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0048] It should be noted that arrowheads in annotations represent non-physical areas such as holes and slots, non-specific physical features such as superordinate features, or specific directions. Arrowheads without arrowheads in annotations represent physical features or specific subordinate specific features.

[0049] When a component is referred to as being "fixed to" or "disposed on" another component, it may be located directly or indirectly on the other component. When a component is referred to as being "connected to" another component, it may be directly or indirectly connected to the other component. The directions or positions indicated by the terms "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the directions or positions shown in the accompanying drawings and are only for the convenience of description and are not to be understood as limitations on this technical solution. The terms "first" and "second" are only used for the convenience of description and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0050] Example 1

[0051] like Figure 1 、 Figure 2 As shown, this embodiment provides a crack-resistant flashlight tail cap 100 for connection to a flashlight body 200. For the convenience of structural description, the structure is described by taking the flashlight in the radial direction along the up-down direction as an example, and the flashlight tail cap 100 is connected to the lower end of the flashlight body 200. The flashlight tail cap 100 mainly includes a cover body 110. The cover body 110 adopts a disc-shaped structure, so the cover body 110 has a vertical central axis. The radial direction of the cover body 110 is horizontal and perpendicular to the central axis. For the convenience of description, the direction toward the central axis in the radial direction is referred to as the inner side, and the direction away from the central axis is referred to as the outer side.

[0052] like Figure 2 、 Figure 3 As shown, a limit retaining ring 111 is protruded from the inner edge of the upper surface of the cover body 110 of this embodiment. The upper surface of the cover body 110 is located outside the limit retaining ring 111 to form a sealing surface 120. A limit step is formed between the sealing surface 120 and the outer wall of the limit retaining ring 111. The limit retaining ring 111 is used to be inserted into the inner cavity of the barrel 200 and is matched and limited by the limit step so that the end face (lower end face) of the barrel 200 can abut against the sealing surface 120. A sealing groove 121 surrounding the central axis of the cover body 110 is provided on the sealing surface 120. A sealing ring 130 is used to be arranged in the sealing groove 121. When the end face of the barrel 200 abuts against the sealing surface 120, the sealing ring 130 is pressed downward, thereby achieving a seal between the sealing surface 120 and the lower end face of the barrel 200. On the outer wall of barrel 200, offer notch step, notch step extends to the lower end face of barrel 200, thereby forms end notch 210 on barrel 200, by end notch 210 and the edge of cover 110 at a certain distance.By turning, form notch step at the afterbody (near tail cap one end) of barrel 200, make the flashlight tail cap 100 after being connected with barrel 200, the outer wall of cover 110 forms support by stepped notch step, and can also avoid barrel 200 and cover 110 from causing extrusion and breakage at marginal position.Form avoidance annular groove 220 between the sealing surface 120 of present embodiment and the end notch 210 of barrel 200, avoidance annular groove 220 surrounds outer wall one week, and the groove width (width of up and down direction) of avoidance annular groove 220 is greater than 0.3mm.Therefore, by suitably strengthening by the width that avoids annular groove, can reduce the risk that causes edge near end notch 210 upper wall of barrel 200 after cover 110 is deformed. Meanwhile, the cover 110 of this embodiment is a hard cover made of a mixture of polycarbonate and glass fiber. The use of a hard cover reduces the toughness of the flashlight tail cover 100 but increases its strength, making it less likely to deform and sink.

[0053] like Figure 2 、 Figure 3As shown, the anti-cracking flashlight tail cover 100 of this embodiment forms a gap between the sealing surface 120 of the cover body 110 and the end notch 210 of the barrel body 200 after the cover body 110 is connected to the barrel body 200, so that the groove width of the gap 220 is increased to more than 0.3 mm. When the flashlight tail cover 100 is deformed by being squeezed by the screw or deformed in a hot environment, the groove width spacing of the gap 220 is greater than the deformation of the cover body 110. Even after the cover body 110 is deformed, there is still a gap in the gap 220. In this way, it is difficult for the cover body 110 to contact the end notch 210 of the barrel body 200 after deformation, thereby avoiding mutual squeezing and pressure causing the tail cover to crack. Furthermore, the rigid cover body is formed by injection molding a mixture of polycarbonate and glass fiber, thereby enhancing the structural strength of the flashlight tail cover 100 while maintaining a low weight. This significantly reduces the cost of the injection molding process and improves the aesthetics of the flashlight tail cover 100. Therefore, after being assembled with the barrel 200, the tail cover 100 will not only prevent contact with the end notch 210, preventing the barrel 200 from exerting pressure on the tail cover 100, but also, through the change in the material of the tail cover 100, reduce its toughness but increase its strength, making it less susceptible to deformation and sinking. This makes the tail cover 100 less susceptible to cracking and damage during use.

[0054] like Figure 2 、 Figure 3 As shown, further, the groove width X of the air-avoiding ring groove 220 of this embodiment is greater than or equal to 1.3 mm. Specifically, the groove width X of the air-avoiding ring groove 220 of this embodiment is the width of the notch in the up-down direction. When the depth of the groove width X of the air-avoiding ring groove 220 is 1.3 mm, the distance between the edge of the cover 110 and the outer wall edge of the barrel 200 is increased. When the cover 110 is squeezed by a screw or deformed in a hot environment, even if the tail cover 100 of the flashlight is deformed and sinks, the spacing distance will not exceed 1.3 mm, so that the edge of the cover 110 will not contact the end notch 210, and thus the relative squeezing force will not be generated to press down the tail cover 100 of the flashlight and cause it to crack.

[0055] like Figure 2 、 Figure 3 As shown, the polycarbonate (PC) in the hard cover of this embodiment accounts for 50% to 80% by weight, and the glass fiber (GF) accounts for 20% to 50% by weight. By adding a certain proportion of glass fiber to the polycarbonate, the tail cover is strengthened while maintaining a low weight, without significantly increasing the cost, and the finished flashlight tail cover 100 is also more aesthetically pleasing.

[0056] If the material contains a large percentage of glass fiber, the weight will increase slightly, and the cost will also increase. Furthermore, a high percentage of glass fiber will result in a poorer color and affect the aesthetics of the tail cover, i.e., a high percentage of glass fiber will result in floating fiber lines. Therefore, the cover body 110 of this embodiment is specifically made of 70% polycarbonate + 30% glass fiber. This is used as the raw material for injection molding. The resulting tail cover has both toughness and rigidity, with minimal weight and cost increases. The surface color, texture, and aesthetics are close to those of a pure polycarbonate cover body 110, and the strength is increased to prevent cracking.

[0057] like Figure 2 、 Figure 3 As shown, the sealing surface 120 of the cover 110 further includes a first surface 122 and a second surface 123. The first surface 122 is provided on the side of the sealing groove 121 facing the central axis, and the second surface 123 is provided on the side of the sealing groove 121 facing away from the central axis. In the height direction, the first surface 122 is provided to protrude from the second surface 123. The first surface 122 is used to abut against the end surface of the barrel 200, so that an accommodation gap 124 is formed between the end surface of the barrel 200 and the second surface 123. In the specific structure, the sealing groove 121 is arranged around the central axis, with a second surface 123 formed on the outside of the notch of the sealing groove 121 and a first surface 122 formed on the inside. Since the height of the first surface 122 is slightly greater than the height of the second surface 123, when the lower end face of the barrel 200 abuts against the first surface 122, a small accommodation gap 124 is formed between the lower end face and the second surface 123. This accommodation gap 124 allows the squeezed sealing ring 130 to deform and enter, thereby achieving sealing and completing the assembly of the barrel 200 and the cover 110. The air-avoiding annular groove 220 can then be the distance enclosed by the second surface 123 and the end notch 210 of the barrel 200.

[0058] Example 2

[0059] This embodiment is improved on the basis of the first embodiment:

[0060] like Figure 3As shown, further, the groove width of the air-avoiding annular groove 220 of this embodiment is X = 0.3 + 0.8 / C, where C is the radial width of the second surface 123. Since the structural strength of the cover 110 is related to the width of the sealing surface 120, generally, the wider the sealing surface 120, the thicker the wall of the cover 110, and the stronger the structure. Research has shown that the structural strength at the edge of the cover 110 is significantly affected by the radial width of the second surface 123. On the basis of the groove width of the air-avoiding annular groove 220 being greater than 0.3 mm, in order to prevent the deformation of the cover 110 from causing the outer edge of the second surface 123 to contact the barrel 200, the groove width is set to meet the relationship of X = 0.3 + 0.8 / C. That is, even under extreme deformation, the groove width of the air-avoiding annular groove 220 will not exceed the groove width and squeeze the upper surface of the end notch 210 of the barrel 200. This effectively ensures that the cover 110 connected to the barrel 200 is not easily cracked by the extrusion force.

[0061] Example 3

[0062] like Figure 2 、 Figure 4 As shown, this embodiment is improved on the basis of the first embodiment:

[0063] A first annular platform 140 is provided on the first surface 122. The sealing surface 120 in this case serves as the second surface 123. The first annular platform 140 is arranged around the central axis and protrudes from the notch of the sealing groove 121. The top of the first annular platform 140 has a first arcuate bearing surface 141, which is used to abut against the inner end surface of the barrel 200. In the specific structure, the formation of the first arcuate bearing surface 141 at the top of the first annular platform 140 increases the load-bearing capacity of the first surface 122. When the lower end surface of the barrel 200 abuts against the cover 110, the load is provided by the first arcuate bearing surface 141, thereby being able to withstand a large extrusion force. When the cover 110 is squeezed by the barrel 200 due to screw fixation, it is less likely to be deformed and cracked.

[0064] Furthermore, the inner and outer sides of the first annular platform 140 are provided with inclined inner wall surfaces 142, which are connected to the first arched bearing surface 141. The inner and outer wall surfaces of the circle formed by the first annular platform 140 are inclined, so that the first annular platform 140 is larger at the bottom and smaller at the top, forming a triangular structure, which further increases the structural strength and makes it less likely that the cover 110 will be deformed and cracked when it is squeezed by the barrel 200. In addition, because the inclined inner wall surfaces 142 are above the notch of the sealing groove 121, the space above the notch of the sealing groove 121 is increased. In this way, when the sealing ring 130 is squeezed, deformation space is also provided for the deformation of the sealing ring 130. Using a larger sealing ring 130 not only improves the sealing effect, but also relieves the squeezing of the barrel 200, reducing the stress on the cover 110.

[0065] Example 4

[0066] like Figure 2 、 Figure 5 As shown, this embodiment is improved on the basis of the first or third embodiment:

[0067] A second annular platform 150 is provided on the second surface 123, and the second annular platform 150 is located at the outer edge of the sealing surface 120. The second annular platform 150 has a second arched bearing surface 151, and the second arched bearing surface 151 is located in the air-avoiding annular groove 220. Since the second annular platform 150 adopts the second arched bearing surface 151 at the top, the arched bearing surface can increase the bearing capacity of the edge of the cover body 110, so that the outer edge of the cover body 110 forms an arc structure that is not easy to break. During deformation, the protruding second annular platform 150 moves upward. Even if it abuts against the barrel 200, the cover body 110 is not easy to break due to the strong bearing capacity of the second arched bearing surface 151 of the second annular platform 150. In combination with the groove width of the air-avoiding annular groove 220, a double layer of insurance is added to prevent rupture.

[0068] Example 5

[0069] like Figure 1 、 Figure 2 As shown, the present application further provides a flashlight comprising a body 200 and the flashlight tail cap 100 described in the above embodiment. An end notch 210 is formed on the outer wall of the end of the body 200. The end notch 210 is enlarged to avoid contact with the deformed flashlight tail cap 100. A sealing ring 130 is disposed in the sealing groove 121 of the flashlight tail cap 100. The flashlight tail cap 100 is connected to the body 200 via fasteners, and the end surface of the body 200 abuts against the sealing surface 120 of the flashlight tail cap 100 and compresses the sealing ring 130.

[0070] Example 6

[0071] like Figure 6 As shown, the present application also proposes a manufacturing process for a crack-resistant flashlight tail cover, which is applied to the crack-resistant flashlight tail cover described in the above embodiment, wherein the manufacturing process mainly includes the following steps:

[0072] Step S100: uniformly stirring raw materials according to a certain proportion, wherein the raw materials include polycarbonate and glass fiber.

[0073] In the specific process, the weight percentage of polycarbonate in the raw materials is 50%-80%, and the weight percentage of glass fiber is 20%-50%. In this embodiment, 70% polycarbonate and 30% glass fiber are selected as the raw materials for injection molding, and the resulting tail cap has both toughness and rigidity. The raw materials are poured into the color mixer according to the proportion and stirred evenly. The color mixer is a large-capacity vertical color mixer.

[0074] Step S200: baking the mixed raw materials.

[0075] In the specific process, the mixed raw materials are put into the oven for baking at a temperature of 120° C. and a baking time of 4 hours.

[0076] Step S300: Put the dried raw materials into an injection molding machine to melt the materials, and perform injection molding in a base mold to obtain a tail cover injection molded part.

[0077] Specifically, the dried raw materials are put into the injection molding machine for melting, and then the pre-prepared base mold (the injection mold of the flashlight tail cover) is selected for injection molding, and the parameters are adjusted, and the power switch of the injection molding machine is pressed to perform injection molding.

[0078] like Figure 6 、 Figure 7 As shown, this step S300 specifically includes steps S310 to S350, which are as follows:

[0079] Step S310: Select the flashlight tail cover configuration file on the injection molding machine, and when it is confirmed that the heating conditions meet the standards, start melting the raw materials.

[0080] In the specific process, press the power switch of the injection molding machine, select the configuration file of the flashlight tail cover, press the heating switch, and when the status bar in the heating interface shows ok, press the motor key to melt the raw material.

[0081] The configuration file for the flashlight tail cap includes various injection molding process parameters, which are as follows:

[0082]

[0083]

[0084] Step S320: press-fit the base spring piece onto the pre-prepared tooling, manually control the injection molding machine to insert the tooling with the base spring piece into the corresponding slot of the base mold, and hit the tooling with a hardware knocker until there is no gap between the tooling and the slot.

[0085] In the specific process, press the two base springs onto the tooling, press the "manual" button on the injection molding machine control panel, and then press the "ejector mold back" button. At this time, the door of the injection molding machine is opened, and the tooling with the base springs is inserted into the corresponding slot of the base mold. Use a hardware knocker to lightly hit the tooling until there is no gap between the tooling and the slot of the base mold, and then close the door of the injection molding machine.

[0086] Step S330: semi-automatically control the injection molding machine so that the injection molding machine program automatically controls the base mold to close the mold and then perform injection molding.

[0087] In the above process, press the "semi-automatic" button, the injection molding machine program automatically closes the base mold and starts injection molding, and waits for the predetermined injection time (usually a few seconds) before the flashlight tail cover is injection molded.

[0088] Step S340: After the predetermined injection time, the injection molding machine program automatically controls the base mold to open, and automatically removes the sprue piece and the indicator light shield.

[0089] After waiting for a few seconds for injection molding, the program controls the base mold to open and automatically removes the nozzle parts and indicator light shield.

[0090] Step S350: Take out the molded tail cover injection molded part and the tooling from the groove of the base mold.

[0091] Step S400: inspect the tail cap injection molded parts, remove the flash and cut off the sprue position of the tail cap injection molded parts that pass the inspection, and obtain a single tail cap.

[0092] During the specific process, the tail cap injection molded parts are inspected to check whether there is any shrinkage, white top or other appearance defects, and the flash is cut off and the sprue is cut off. Thus, the tail cap can be obtained as a single piece.

[0093] Step S500: annealing the tail cover and cooling it after annealing to obtain a finished tail cover.

[0094] In the specific process, the lid of the preheated annealing box is opened, and the tail cap is placed on the edge of the annealing box and pushed into the box and the lid of the annealing box is closed. The annealing box is moved to the storage area and left to stand for 2 hours to cool naturally to obtain the finished tail cap.

[0095] It should be noted that the annealing box can be prepared before injection molding, that is, after the melt is melted in step S310, the heating tube is connected to the annealing box and the box cover is closed and heated to 110°C.

[0096] Step S600: Mark the finished tail caps and put them into storage.

[0097] In the specific process, the finished tail caps are marked and placed in the material box, marked and put into storage.

[0098] Example 6

[0099] The main difference between this embodiment and Example 5 is that the mass of the polycarbonate in the raw materials accounts for 90%, and the mass of the glass fiber accounts for 10%. The baking temperature is 120°C and the baking time is 4 hours. The tail cap formed by injection molding is close to the strength of the pure polycarbonate tail cap, with strong impact resistance (i.e., toughness) but poor rigidity. After assembly, the local stress caused by the screws will continue to press down on the tail cap, causing deformation of the tail cap and affecting its appearance. It will still cause cracking in the long run.

[0100] Example 7

[0101] The main difference between this embodiment and Example 5 is that the raw materials are 80% polycarbonate by weight and 20% glass fiber by weight. The baking temperature is 120°C and the baking time is 4 hours. The tail cap formed by injection molding has improved strength and is relatively stable after assembly, but it will still deform locally under impact, affecting its aesthetics.

[0102] Example 8

[0103] The main difference between this embodiment and Example 5 is that the raw materials comprise 60% polycarbonate by weight and 40% glass fiber by weight. The baking temperature is 120°C and the baking time is 4 hours. The tail cap formed by injection molding is not easily deformed and has high rigidity. However, this significant increase in rigidity makes the tail cap brittle and easily breaks directly after being hit.

[0104] Example 9

[0105] The main difference between this embodiment and Example 5 is that the raw materials are 50% polycarbonate by weight and 50% glass fiber by weight. The baking temperature is 120°C and the baking time is 4 hours. The tail cap formed by injection molding is more difficult to process, with high costs and increased weight. The surface aesthetics is significantly reduced, with visible floating fibers, and the toughness is too low to be easily broken.

[0106] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A crack-proof tail cap for a flashlight, used to connect to the body of the flashlight, characterized in that: The tail cover of the flashlight comprises: a cover body, the cover body having a sealing surface, a sealing groove surrounding the central axis of the cover body, a sealing ring disposed in the sealing groove, a gap between the sealing surface and the end notch of the barrel forming a gap-avoiding ring groove, and a groove width of the gap-avoiding ring groove greater than 0.3 mm; Wherein, the cover body is a hard cover body made of mixed injection molding of polycarbonate and glass fiber.

2. The anti-cracking tail cap of a flashlight according to claim 1, characterized in that: The groove width X of the air-avoiding ring groove is greater than or equal to 1.3 mm.

3. The anti-cracking tail cap of a flashlight according to claim 1, characterized in that: The sealing surface includes a first surface and a second surface, wherein the first surface is arranged on a side of the sealing groove facing the central axis, and the second surface is arranged on a side of the sealing groove facing away from the central axis; In the height direction, the first surface is arranged to protrude from the second surface; The first surface is used to abut against the end surface of the barrel, so that an accommodating gap is formed between the end surface of the barrel and the second surface.

4. The anti-cracking tail cap of a flashlight according to claim 3, characterized in that: The groove width of the air-avoiding ring groove is X=0.3+0.8 / C, where C is the radial width of the second surface.

5. The anti-cracking tail cap of a flashlight according to claim 3, characterized in that: A first ring platform is provided on the first surface, the first ring platform protrudes from the notch of the sealing groove, and the top of the first ring platform has a first arched bearing surface, and the first arched bearing surface is used to abut against the inner end surface of the barrel; Inner and outer sides of the first ring platform are arranged as inclined inner wall surfaces, and the inclined inner wall surfaces are connected to the first arched bearing surface.

6. The anti-cracking tail cap of a flashlight according to any one of claims 1 to 5, characterized in that: The mass proportion of polycarbonate in the hard cover is 50%-80%, and the mass proportion of glass fiber is 20%-50%.

7. A flashlight, characterized in that: The flashlight comprises a barrel and a tail cover of the flashlight according to any one of claims 1 to 6, wherein an end notch is formed on the outer wall of the end of the barrel; A sealing ring is provided in the sealing groove of the tail cover of the flashlight. The tail cover of the flashlight is connected to the barrel through a fastener, and the end face of the barrel rests on the sealing surface of the tail cover of the flashlight and squeezes the sealing ring.

8. A manufacturing process for a crack-resistant tail cap of a flashlight, applied to the crack-resistant tail cap of a flashlight as claimed in any one of claims 1 to 6, characterized in that: The manufacturing process comprises the steps of: uniformly stirring the raw materials according to a proportion, wherein the raw materials include polycarbonate and glass fiber; Bake the mixed ingredients; The dried raw materials are placed in an injection molding machine to melt the materials, and injection molding is performed in a base mold to obtain a tail cover injection molded part; Inspecting the tail cap injection molded parts, removing the flash and cutting off the sprue position of the tail cap injection molded parts that have passed the inspection, and obtaining a single tail cap; Annealing the tail cover piece, and cooling it after annealing to obtain a finished tail cover; The finished tail caps are marked and put into storage.

9. The manufacturing process of a crack-proof flashlight tail cap according to claim 8, characterized in that: In the step of uniformly stirring the raw materials in proportion, wherein the raw materials include polycarbonate and glass fiber: The mass proportion of the polycarbonate in the raw materials is 70%, and the mass proportion of the glass fiber is 30%.

10. The manufacturing process of the anti-cracking tail cap of a flashlight according to claim 8, characterized in that: The steps of inspecting the tail cap injection molded parts, removing the flash and cutting off the sprue of the tail cap injection molded parts that have passed the inspection, and obtaining the tail cap single piece specifically include: Select the flashlight tail cover configuration file on the injection molding machine, and after confirming that the heating conditions meet the standards, start melting the raw materials; Press the base spring piece onto a pre-prepared tooling, manually control the injection molding machine to insert the tooling with the base spring piece into the corresponding slot of the base mold, and hit the tooling with a hardware knocker until there is no gap between the tooling and the slot; The injection molding machine is semi-automatically controlled so that the injection molding machine program automatically controls the base mold to close the mold and then perform injection molding; After the predetermined injection time, the injection molding machine program automatically controls the base mold to open, and automatically removes the nozzle piece and the indicator light shield; The molded tail cover injection molded part and the tooling are taken out from the groove cavity of the base mold.

Images