A fastening structure for a power bank housing and an assembly method thereof

Abstract

A fastening structure for a power bank shell and an assembly method thereof, the fastening structure for a power bank shell comprising: an upper shell, a lower shell, screws and nuts. A guide column is provided in the lower shell, a stepped hole and a guide groove are provided in the guide column, the stepped hole has a guide portion and an avoidance portion, the guide groove is located on the guide portion, and the guide groove extends along the axis of the stepped hole; the nut is located in the guide portion, a retaining ring and a protrusion matching the guide groove are provided on the outer wall of the nut, and a filling layer is provided in the area surrounded by the inner wall of the stepped hole and the outer wall of the nut; the upper shell covers the lower shell, and the screw is threadedly connected with the nut after passing through the upper shell. A stepped hole for accommodating the nut is provided on the lower shell, and the nut is fixed by mechanical matching, so as to ensure that the shell is sufficiently fastened while avoiding deformation of the lower shell when the nut is fixed; a filling layer is provided in the stepped hole, so as to further fix the nut while making the appearance of the nut installation part consistent with other parts.

Description

Technical Field

[0001] The present invention relates to the field of plastic products, and in particular to a fastening structure for a power bank shell and an assembling method thereof. Background Art

[0002] The power bank is mainly composed of a shell and the battery cells inside. In order to ensure the later recycling of the battery cells and maintenance, the shell needs to be detachable, for example, the shell is divided into an upper shell and a lower shell. When assembling, the battery cells are first placed in the lower shell, and then the upper shell is covered and the upper shell and the lower shell are threadedly connected by screws. Figure 1 The lower shell 20 shown is provided with a screw column 21 connected to the screw thread. In order to prevent the screw column 21 from cracking due to the torque generated when tightening the screw, a metal nut 22 is usually hot-pressed on the screw column 21 after injection molding.

[0003] However, due to the small thickness of the power bank body, when the metal nut 22 is hot-pressed, the heat of the nut can easily melt the area around the screw column 21, causing deformation of the area around the screw column 21, resulting in a defective power bank shell. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a fastening structure for a power bank shell and an assembling method thereof, so as to reduce the probability of defective products being produced during the production process of the power bank shell.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] A fastening structure for a power bank housing, comprising: an upper housing, a lower housing, screws and nuts;

[0007] A guide column is provided in the lower shell, and a stepped hole and a guide groove are provided in the guide column. The stepped hole has a guide portion and an avoidance portion. The guide groove is located on the guide portion, and the guide groove extends in the direction of the axis of the stepped hole.

[0008] The nut is located in the guide portion, a snap ring and a protrusion matching the guide groove are provided on the outer wall of the nut, and the snap ring passes through the avoidance portion;

[0009] A filling layer is provided in the area enclosed by the inner wall of the stepped hole and the outer wall of the nut;

[0010] The upper shell covers the lower shell, and the screw is threadedly connected with the nut after passing through the upper shell.

[0011] In one embodiment, the material of the filling layer is the same as that of the lower shell.

[0012] In one of the embodiments, a plurality of stop teeth are provided on the outer wall of the nut.

[0013] In one embodiment, the diameter of the guide portion is greater than the outer diameter of the nut.

[0014] In one embodiment, the upper shell is provided with a screw hole, and the screw passes through the screw hole.

[0015] In one of the embodiments, a plug is further included, and the plug is used to seal the screw hole.

[0016] In one embodiment, the clamping ring is interference fit with the avoidance portion.

[0017] A method for assembling a power bank shell, based on the above-mentioned fastening structure for the power bank shell, adopts a glue filling device to make a filling layer, the glue filling device comprises a conveyor belt and a labeling component, a glue injection gun, and a curing box arranged in sequence along the conveying direction of the conveyor belt, the labeling component comprises an adhesive tape, a material tray, a tensioning wheel group, a dividing knife, and a recycling reel, the adhesive tape is arranged on the material tray, and the adhesive tape is connected to the recycling reel after passing through the tensioning wheel group and the dividing knife, and the recycling reel is used to roll up the adhesive tape; the adhesive tape has a release film and a plurality of adhesive papers attached to the surface of the release film, the dividing knife faces the conveyor belt, and the dividing knife is used to separate the release film from the adhesive paper so that the adhesive paper covers the stepped hole; the glue injection gun is provided with a pin, the pin pierces the adhesive paper, and fills the stepped hole with injection liquid, and the assembly steps of the power bank shell are as follows:

[0018] Step 1: After installing the battery cell and control board into the lower case, insert the nut into the stepped hole;

[0019] Step 2: Cover the upper shell, and lock the upper shell and the lower shell with screws to obtain a semi-finished product;

[0020] Step 3: Place the semi-finished products one by one on the conveyor belt with the stepped holes facing upwards;

[0021] Step 4: The reel starts to reel up the tape, passing the tape through the dividing knife until one piece of tape is separated from the release film, and the tape moves along the dividing knife toward the position of the conveyor belt;

[0022] Step 5: When the semi-finished product passes under the dividing knife, the adhesive tape is attached to the lower shell so that the adhesive tape covers the stepped hole;

[0023] Step 6: The semi-finished product continues to move with the conveyor belt to the location of the glue injection gun. The glue injection gun is pressed down, and the needle on it pierces the adhesive tape and extends into the stepped hole to fill the stepped hole with injection liquid;

[0024] Step 7: The conveyor belt starts again and sends the semi-finished product into the curing box, which blows hot air toward the lower shell to solidify the injection molding liquid to form a filling layer;

[0025] Step 8: Tear off the adhesive tape and package the assembled power bank for shipment.

[0026] The above-mentioned fastening structure for the power bank housing has the following beneficial effects:

[0027] 1. A stepped hole for receiving the nut is provided on the lower shell, and the nut is fixed by mechanical fit to ensure that the outer shell is sufficiently tight and avoid deformation of the lower shell when fixing the nut;

[0028] 2. Set a filling layer in the stepped hole to further secure the nut while making the appearance of the nut installation part consistent with other parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 This is a structural diagram of the location of the screw column on the existing power bank shell;

[0031] Figure 2 A schematic diagram of the disassembly of the fastening structure for the power bank housing;

[0032] Figure 3 It is a structural schematic diagram of the glue filling device;

[0033] Figure 4 It is a structural schematic diagram of the labeling component;

[0034] Figure 5 is a schematic diagram of the structure of the guide column;

[0035] Figure 6 is a schematic diagram of the structure of a nut;

[0036] Figure 7 It is a schematic diagram of the cooperation between the screw and the nut;

[0037] Figure 8 It is a schematic diagram of the matching between the adhesive tape and the stepped hole;

[0038] Fig. 9 This is a schematic diagram of the glue gun when replenishing glue. DETAILED DESCRIPTION

[0039] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0040] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0042] See also Figure 2 The present invention provides a fastening structure for a power bank shell, which includes: an upper shell 100, a lower shell 200, a screw 300 and a nut 400.

[0043] See also Figure 2 and Figure 5 A guide column 210 is provided in the lower shell 200, and a stepped hole 211 and a guide groove 212 are provided in the guide column 210. The stepped hole 211 has a guide portion 11 and an avoidance portion 12. The guide groove 212 is located on the guide portion 11, and the guide groove 212 extends along the axis of the stepped hole 211.

[0044] See also Figure 5 and Figure 6 The nut 400 is located in the guide portion 11, and a snap ring 410 and a protrusion 420 matching the guide groove 212 are provided on the outer wall of the nut 400, and the snap ring 410 passes through the avoidance portion 12;

[0045] See also Fig. 9 A filling layer 500 is provided in the area enclosed by the inner wall of the stepped hole 211 and the outer wall of the nut 400 ; the filling layer 500 is used to block the stepped hole 211 , and the nut 400 can be fixed inside the stepped hole 211 , thereby improving the structural stability of the housing.

[0046] The upper shell 100 covers the lower shell 200 , and the screw 300 passes through the upper shell 100 and is threadedly connected with the nut 400 .

[0047] The upper shell 100 and the lower shell 200 are both made by injection molding. A guide column 210 is formed in the inner cavity of the lower shell 200, and a stepped hole 211 is provided on the guide column 210. When assembling the outer shell, the nut 400 can be inserted into the stepped hole 211 so that the nut 400 is located in the guide portion 11, and the retaining ring 410 on the nut 400 is penetrated by the avoidance portion 12. After covering the upper shell 100, the upper shell 100 and the lower shell 200 are locked together by threading the screw 300 and the nut 400. The protrusion 420 on the nut 400 is embedded in the guide groove 212, which can prevent the nut 400 from rotating during the screw locking process. Preferably, the retaining ring 410 and the avoidance portion 12 are interference fit, and the retaining ring 410 and the avoidance portion 12 are stuck together to preliminarily fix the nut 400.

[0048] The above-mentioned fastening structure for the power bank housing has the following beneficial effects:

[0049] 1. A stepped hole 211 for receiving the nut 400 is provided on the lower shell 200, and the nut 400 is fixed by mechanical cooperation, so as to ensure that the outer shell is sufficiently tightened and avoid deformation of the lower shell 200 when the nut 400 is fixed;

[0050] 2. A filling layer 500 is provided in the stepped hole 211 to further fix the nut 400 and make the appearance of the installation part of the nut 400 consistent with other parts.

[0051] Preferably, the material of the filling layer 500 is the same as that of the lower shell 200, so that the filling layer 500 and the lower shell 200 have the same appearance, and no difference will be formed on the lower shell 200 after filling.

[0052] See also Figure 6 In one embodiment, a plurality of stop teeth 430 are provided on the outer wall of the nut 400. The stop teeth 430 make the surface of the nut 400 uneven, increase the contact surface between the nut 400 and the filling layer 500, and make the nut 400 less likely to loosen.

[0053] In one embodiment, the diameter of the guide portion 11 is larger than the outer diameter of the nut 400 , so that a gap is left between the nut 400 and the guide portion 11 , and the thickness of the filling layer 500 is increased to make the nut 400 more secure.

[0054] See also Figure 2 and Fig. 9In one embodiment, the upper shell 100 is provided with a screw hole 110, and the screw 300 is passed through the screw hole 110. When the upper shell 100 is covered on the lower shell 200, the screw hole 110 is aligned with the stepped hole 211 to facilitate the threaded connection between the screw 300 and the nut 400. Preferably, the fastening structure for the power bank shell also includes a plug 700, which is used to block the screw hole 110. When the power bank needs to be maintained, the plug 700 is opened and then the screw 300 is turned; the plug 700 blocks the screw hole 110 to isolate the screw 300 from the outside world, which can reduce the probability of the screw 300 rusting.

[0055] It should be noted that in the prior art, since the outer shell of the power bank is made of plastic, the problem of thread slippage is easy to occur when the screws are directly locked. Therefore, it is necessary to embed a metal nut in the position of the screw by hot pressing to avoid damage to the outer shell caused by the torque generated during the screw locking process; however, the power bank is small in size and thin in thickness, and hot pressing of the metal nut is easy to cause the plastic around the nut to melt, causing deformation of the outer shell. In this application, the nut 400 is first pre-installed into the lower shell 200 in a mechanically matched manner, and after the upper shell 100 is covered and the screws 300 are locked, the nut 400 is completely fixed by the filling layer 500, and the filling layer 500 is formed by solidification of the injection molding liquid. The specific position of the filling layer 500 is the area enclosed by the inner wall of the stepped hole 211 and the outer wall of the nut 400. Therefore, the amount of injection molding liquid that needs to be filled is small, and overflow is prone to occur when filling the injection molding liquid. The overflowed injection molding liquid stays on the surface of the lower shell 200 to form obvious "water marks", which requires polishing and rework after the filling layer 500 is cured. This will affect the assembly efficiency of the power bank, so the assembly method needs to be optimized.

[0056] See also Figure 3 , Figure 4 and Fig. 9 In order to solve the above problems, the present application provides a method for assembling a power bank shell. Based on the above fastening structure for the power bank shell, a glue filling device 600 is used to make a filling layer 500. The glue filling device 600 includes a conveyor belt 610 and a labeling component 620, a glue injection gun 630, and a curing box 640 sequentially arranged along the conveying direction of the conveyor belt 610. The labeling component 620 includes an adhesive tape 621, a material tray 622, a tensioning wheel group 623, a material dividing knife 624, and a recovery reel 625. The adhesive tape 621 is arranged on the material tray 622. The adhesive tape 621 is connected to the recovery reel 625 after passing around the tensioning wheel group 623 and the dividing knife 624. The recovery reel 625 is used to rewind the adhesive tape 621. The adhesive tape 621 has a release film 13 and a plurality of adhesive papers 14 attached to the surface of the release film 13. The dividing knife 624 faces the conveyor belt 610. The dividing knife 624 is used to separate the release film 13 from the adhesive paper 14 so that the adhesive paper 14 covers the stepped hole 211. The glue injection gun 630 is provided with a pin 631, which pierces the adhesive paper 14 and fills the stepped hole 211 with injection liquid.

[0057] See also Figure 7 , Figure 8 and Fig. 9 , the assembly steps of the power bank shell are as follows:

[0058] Step 1: After installing the battery cell and the control board into the lower housing 200, insert the nut 400 into the stepped hole 211;

[0059] When installing the nut 400, it is necessary to point the end with the retaining ring 410 thereon toward the stepped hole 211, rotate the nut 400 to align the protrusion 420 with the guide groove 212, and then push the nut 400 so that it enters the guide portion 11 until the retaining ring 410 is inserted into the avoidance portion 12. The nut 400 is pre-installed. At this time, the nut 400 is initially fixed in the stepped hole 211 by the friction force between the retaining ring 410 and the avoidance portion 12, and is still in an incompletely fixed state.

[0060] Step 2: Cover the upper shell 100, and lock the upper shell 100 and the lower shell 200 with screws 300 to obtain a semi-finished product;

[0061] The screw 300 is threadedly connected with the nut 400 to lock the upper shell 100 and the lower shell 200 together, and further fix the nut 400 in the stepped hole 211. Figure 7 shown.

[0062] Step 3: Place the semi-finished products one by one on the conveyor belt 610 with the stepped holes 211 facing upwards;

[0063] The conveyor belt 610 performs intermittent transmission, allowing the semi-finished products to pass through the labeling assembly 620, the glue injection gun 630 and the curing box 640 one by one.

[0064] Step 4: The recycling reel 625 starts to rewind the adhesive tape 621, and the adhesive tape 621 passes through the dividing knife 624 until one adhesive tape 14 is separated from the release film 13, and the adhesive tape 14 moves along the dividing knife 624 toward the position of the conveyor belt 610;

[0065] The dividing knife 624 contacts the release film 13, and the adhesive tape 621 bends greatly when passing the end of the dividing knife 624. Under the action of its own tension, the adhesive paper 14 separates from the release film 13 at the bent position of the adhesive tape 621. The release film 13 moves toward the position of the recovery roll 625, and the adhesive paper 14 moves toward the position of the conveyor belt 610. At this time, the sticky side of the adhesive paper 14 faces the conveyor belt 610.

[0066] Step 5: When the semi-finished product passes under the dividing knife 624 , the adhesive tape 14 is attached to the lower shell 200 , so that the adhesive tape 14 covers the stepped hole 211 ;

[0067] Since the stepped hole 211 of the semi-finished product faces upward, when it passes under the dividing knife 624, it contacts the sticky side of the adhesive tape 14. During the movement, the adhesive tape 14 is attached to the lower shell 200 and covers the stepped hole 211. At this time, the stepped hole 211 is in a relatively sealed state. Figure 8 shown.

[0068] Step 6: The semi-finished product continues to move with the conveyor belt 610 to the position of the glue injection gun 630. The glue injection gun 630 is pressed down, and the needle 631 on it pierces the adhesive tape 14 and then extends into the stepped hole 211, and the injection liquid is filled into the stepped hole 211. Fig. 9 As shown;

[0069] Since the stepped hole 211 is temporarily sealed by the adhesive tape 14, the notch on it is the position pierced by the insertion pin 631. Even if the injection molding liquid is filled in excess, it will not directly overflow to the surface of the lower shell 200, but will overflow from the notch pierced by the insertion pin 631. The overflowed injection molding liquid remains on the surface of the adhesive tape 14, which can prevent the surface of the lower shell 200 from being uneven after the injection molding liquid solidifies.

[0070] Step 7: The conveyor belt 610 is started again to send the semi-finished product into the curing box 640, and the curing box 640 blows hot air toward the lower shell 200 to solidify the injection molding liquid to form a filling layer 500;

[0071] The filling layer 500 is bonded to the lower shell 200 , and the nut 400 can be completely fixed in the stepped hole 211 . When the power bank is repaired or recycled, the nut 400 will not fall off when the screw 300 is removed.

[0072] Step 8: Tear off the adhesive tape 14 and package the assembled power bank for shipment.

[0073] It needs to be emphasized again that when the molding liquid is filled into the stepped hole 211, the adhesive tape 14 covers the opening of the stepped hole 211, so that the stepped hole 211 is in a relatively sealed state, and the excess molding liquid cannot directly overflow from the opening of the stepped hole 211; and a gap is formed on the adhesive tape 14 at the position pierced by the pin 631, and the excess molding liquid overflows at the gap. The molding liquid overflowing during the glue repair is caught by the adhesive tape 14 to prevent the overflowed molding liquid from remaining on the surface of the lower shell 200. It is only necessary to tear off the adhesive tape 14 after the molding liquid solidifies to form a filling layer 500, thereby preventing the excess molding liquid from forming "water marks" on the surface of the lower shell 200 during the glue repair, and no subsequent polishing is required, which is beneficial to improving the assembly efficiency of the power bank.

[0074] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A fastening structure for a power bank housing, characterized in that: include: Upper shell, lower shell, screws and nuts; A guide column is provided in the lower shell, and a stepped hole and a guide groove are provided in the guide column. The stepped hole has a guide portion and an avoidance portion. The guide groove is located on the guide portion, and the guide groove extends in the direction of the axis of the stepped hole. The nut is located in the guide portion, a snap ring and a protrusion matching the guide groove are provided on the outer wall of the nut, and the snap ring passes through the avoidance portion; A filling layer is provided in the area enclosed by the inner wall of the stepped hole and the outer wall of the nut; The upper shell covers the lower shell, and the screw is threadedly connected with the nut after passing through the upper shell.

2. The fastening structure for the power bank housing according to claim 1, characterized in that: The material of the filling layer is the same as that of the lower shell.

3. The fastening structure for the power bank housing according to claim 1, characterized in that: A plurality of stop teeth are arranged on the outer wall of the nut.

4. The fastening structure for the power bank housing according to claim 1, characterized in that: The guide portion has a diameter greater than an outer diameter of the nut.

5. The fastening structure for the power bank housing according to claim 1, characterized in that: The upper shell is provided with a screw hole, and the screw passes through the screw hole.

6. The fastening structure for the power bank housing according to claim 5, characterized in that: Also included is a plug, which is used to seal the screw hole.

7. The fastening structure for the power bank housing according to claim 1, characterized in that: The clamping ring is interference-fitted with the avoidance portion.

8. A method for assembling a power bank shell, based on the fastening structure for a power bank shell according to any one of claims 1 to 7, characterized in that: A filling layer is made by a glue filling device, the glue filling device includes a conveyor belt and a labeling component, a glue injection gun, and a curing box arranged in sequence along the conveying direction of the conveyor belt. The labeling component includes an adhesive tape, a material tray, a tensioning wheel group, a dividing knife, and a recovery reel. The adhesive tape is arranged on the material tray, and the adhesive tape is connected to the recovery reel after passing through the tensioning wheel group and the dividing knife. The recovery reel is used to roll up the adhesive tape; the adhesive tape has a release film and a plurality of adhesive papers attached to the surface of the release film, the dividing knife faces the conveyor belt, and the dividing knife is used to separate the release film from the adhesive paper so that the adhesive paper covers the stepped hole; the glue injection gun is provided with a pin, the pin pierces the adhesive paper, and fills the stepped hole with injection liquid. The assembly steps of the power bank shell are as follows: Step 1: After installing the battery cell and control board into the lower case, insert the nut into the stepped hole; Step 2: Cover the upper shell, and lock the upper shell and the lower shell with screws to obtain a semi-finished product; Step 3: Place the semi-finished products one by one on the conveyor belt with the stepped holes facing upwards; Step 4: The reel starts to reel up the tape, passing the tape through the dividing knife until one piece of tape is separated from the release film, and the tape moves along the dividing knife toward the position of the conveyor belt; Step 5: When the semi-finished product passes under the dividing knife, the adhesive tape is attached to the lower shell so that the adhesive tape covers the stepped hole; Step 6: The semi-finished product continues to move with the conveyor belt to the location of the glue injection gun. The glue injection gun is pressed down, and the needle on it pierces the adhesive tape and extends into the stepped hole to fill the stepped hole with injection liquid; Step 7: The conveyor belt starts again and sends the semi-finished product into the curing box, which blows hot air toward the lower shell to solidify the injection molding liquid to form a filling layer; Step 8: Tear off the adhesive tape and package the assembled power bank for shipment.

Images