Tensioning device capable of preventing nut from falling off

Abstract

The utility model relates to a tensioning device for preventing a nut from falling off, and relates to the technical field of injection molding equipment. Comprising an insert pin and a tensioning piece, the insert pin is cylindrical, an extrusion through hole is formed in the side wall of the insert pin, and the insert pin is used for sleeving a nut; and the tensioning piece is arranged in the extrusion through hole, part of the tensioning piece extends out of the extrusion through hole, the tensioning piece has elastic potential energy expanding outwards, and the tensioning piece is used for tensioning the nut. The tensioning piece is arranged in the extrusion through hole, and part of the tensioning piece extends out of the side wall of the insert pin. When the periphery of the insert pin is sleeved with the nut, the part, extending out of the side wall, of the tensioning part can be extruded by the nut and pressed into the extrusion through hole, the tensioning part can tension the nut due to the fact that the tensioning part has the elastic potential energy expanding outwards, and therefore the nut is fixed to the periphery of the insert pin, nut fixing is achieved, and the problem that in the injection molding process of a mold, the nut is not prone to deformation is solved. And a nut sleeved on the insert pin is easy to fall off.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding equipment, in particular to a tensioning device for preventing nuts from falling off. Background Technique

[0002] In the process of injection molding production, it is necessary to sleeving the embedded nuts on the ejector pins, and during the mold clamping and injection molding, the nuts sleeved on the ejector pins may fall off, such as an in-mold injection nut embedding structure disclosed in the patent No. CN214188136U.

[0003] In view of the above related technologies, there is a problem that the nuts sleeved on the ejector pins are prone to fall off during the injection molding process of the mold. Content of the Utility Model

[0004] In view of the deficiencies of the above-mentioned prior art, the purpose of the present utility model is to provide a tensioning device for preventing nuts from falling off, aiming to solve the problem that the nuts sleeved on the ejector pins are prone to fall off during the injection molding process of the mold.

[0005] A tensioning device for preventing nuts from falling off provided by the present application adopts the following technical solution: A tensioning device for preventing nuts from falling off, comprising:

[0006] An ejector pin, with an extrusion through hole provided on its side wall, and the ejector pin is used for sleeving nuts;

[0007] A tensioning member, disposed in the extrusion through hole, and part of the tensioning member extends out of the extrusion through hole. The tensioning member has an elastic potential energy to expand outwards, and the tensioning member is used for tensioning the nut.

[0008] Optionally, the ejector pin includes a tensioning part and a fixing part, the tensioning part is disposed on the fixing part, and the cross-sectional radius of the tensioning part is smaller than the cross-sectional radius of the fixing part.

[0009] Optionally, the tensioning member includes a tensioning base body and an elastic sheet, the elastic sheet is disposed on the tensioning base body, and the elastic sheet has an elastic potential energy to expand outwards.

[0010] Optionally, the elastic sheet includes a first elastic sheet and a second elastic sheet, both the first elastic sheet and the second elastic sheet are disposed on the tensioning base body, and there is an extrusion gap between the first elastic sheet and the second elastic sheet.

[0011] Optionally, the first elastic sheet includes a first elastic sheet connecting part and a first elastic sheet extending part, and the first elastic sheet extending part is disposed on the side of the first elastic sheet connecting part away from the second elastic sheet;

[0012] The second elastic piece includes a second elastic piece connecting portion and a second elastic piece extending portion, and the second elastic piece extending portion is disposed on a side of the second elastic piece connecting portion away from the first elastic piece;

[0013] When the tensioning member is disposed in the extrusion through hole, the first elastic piece extending portion and the second elastic piece extending portion respectively extend out from the extrusion through hole.

[0014] Optionally, the extrusion through hole includes a tensioning through hole and a fixing through hole, the tensioning through hole and the fixing through hole communicate with each other, the tensioning through hole is disposed on the tensioning portion, the fixing through hole is disposed on the fixing portion, the tensioning through hole is used to accommodate the elastic piece, and the fixing through hole is used to accommodate the tensioning base body.

[0015] Optionally, the tensioning device for preventing the nut from falling off includes a fixing sleeve, the fixing sleeve is sleeved on the fixing portion, and the tensioning base body is covered by the fixing sleeve.

[0016] Optionally, the dowel pin includes a positioning portion, and the positioning portion is disposed at one end of the fixing portion away from the tensioning portion;

[0017] A positioning groove is disposed at one end of the fixing sleeve away from the tensioning member, and the positioning groove is engaged with the positioning portion.

[0018] Optionally, the tensioning device for preventing the nut from falling off includes a limiting member, and the limiting member abuts against one end of the dowel pin close to the tensioning member.

[0019] Optionally, the length of the tensioning portion is less than or equal to the thickness of the nut.

[0020] Compared with the prior art, the embodiments of the present invention have the following advantages:

[0021] The tensioning member is disposed in the extrusion through hole and a part of the tensioning member extends out from the side wall of the dowel pin. When the nut is sleeved on the outer periphery of the dowel pin, the part of the tensioning member extending out from the side wall will be squeezed by the nut and pressed into the extrusion through hole. Since the tensioning member has elastic potential energy to expand outwards, the tensioning member will tension the nut, thereby fixing the nut on the outer periphery of the dowel pin, realizing the fixing of the nut, and solving the problem that the nut sleeved on the dowel pin is prone to fall off during the injection molding process of the mold. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a schematic diagram of the overall structure of the tensioning device for preventing nut shedding in the embodiments of the present application;

[0024] Figure 2 It is an exploded view of the tensioning device for preventing nut shedding in the embodiments of the present application;

[0025] Figure 3 It is an exploded view of the inlay pin and the tensioning member of the tensioning device for preventing nut shedding in the embodiments of the present application;

[0026] Figure 4 It is a schematic diagram of the structure of the tensioning member of the tensioning device for preventing nut shedding in the embodiments of the present application.

[0027] Explanation of reference numerals:

[0028] 1. Inlay pin; 11. Tensioning part; 12. Fixing part; 13. Extrusion through hole; 131. Tensioning through hole; 132. Fixing through hole; 14. Positioning part; 2. Tensioning member; 21. Tensioning base body; 211. Bending hole; 22. Elastic piece; 221. First elastic piece; 2211. First elastic piece connecting part; 2212. First elastic piece extending part; 222. Second elastic piece; 2221. Second elastic piece connecting part; 2222. Second elastic piece extending part; 223. First guiding inclined surface; 224. Second guiding inclined surface; 3. Fixed sleeve; 31. Wrapping hole; 32. Positioning member; 321. Positioning groove. Detailed implementation manners

[0029] In order to enable those skilled in the art to better understand the solution of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present utility model.

[0030] The following further details the present application in conjunction with the drawings of the specification.

[0031] The embodiments of the present application disclose a tensioning device for preventing nut shedding.

[0032] Such as Figure 1 、 Figure 2 and Figure 3As shown in the figure, a tensioning device for preventing nut from falling off includes an inlay pin 1 and a tensioning member 2. The inlay pin 1 is cylindrical in shape, and an extrusion through-hole 13 is provided on the side wall. The inlay pin 1 is used to sleeved with a nut; the tensioning member 2 is arranged in the extrusion through-hole 13, and part of the tensioning member 2 extends out of the extrusion through-hole 13. The tensioning member 2 has an elastic potential energy that expands outwards, and the tensioning member 2 is used to tension the nut.

[0033] The tensioning member 2 is arranged in the extrusion through-hole 13 and part of the tensioning member 2 extends out from the side wall of the inlay pin 1. When the nut is sleeved on the outer periphery of the inlay pin 1, the part of the tensioning member 2 extending out from the side wall will be extruded by the nut and pressed into the extrusion through-hole 13. Since the tensioning member 2 has an elastic potential energy that expands outwards, the tensioning member 2 will tension the nut, thereby fixing the nut on the outer periphery of the inlay pin 1, realizing the fixation of the nut, and solving the problem that the nut sleeved on the inlay pin 1 is prone to fall off during the injection molding process of the mold.

[0034] The inlay pin 1 includes a tensioning part 11 and a fixing part 12. The tensioning part 11 is arranged on the fixing part 12, and the cross-sectional radius of the tensioning part 11 is smaller than the cross-sectional radius of the fixing part 12.

[0035] Specifically, the inlay pin 1 is in the shape of a stepped cylinder. The tensioning part 11 and the fixing part 12 are both cylindrical in shape. The tensioning part 11 is arranged at one end of the fixing part 12, and the tensioning part 11 and the fixing part 12 are coaxially arranged.

[0036] To facilitate the inlay pin 1 to fix the nut, the cross-sectional radius of the tensioning part 11 in the radial direction is smaller than the cross-sectional radius of the fixing part 12 in the radial direction, and the cross-sectional radius of the tensioning part 11 in the radial direction is smaller than or equal to the inner diameter of the nut, and the cross-sectional radius of the fixing part 12 in the radial direction is larger than the inner diameter of the nut.

[0037] When the nut is sleeved on the tensioning part 11, the fixing part 12 can abut against the nut to prevent the nut from sliding out from the other end of the inlay pin 1.

[0038] In this embodiment, the cross-sectional radius of the tensioning part 11 in the radial direction is equal to the inner diameter of the nut.

[0039] As Figure 3 and Figure 4 shown, the tensioning member 2 includes a tensioning base body 21 and an elastic sheet 22. The elastic sheet 22 is arranged on the tensioning base body 21, and the elastic sheet 22 has an elastic potential energy that expands outwards.

[0040] The elastic sheet 22 includes a first elastic sheet 221 and a second elastic sheet 222. The first elastic sheet 221 and the second elastic sheet 222 are both arranged on the tensioning base body 21, and there is an extrusion gap between the first elastic sheet 221 and the second elastic sheet 222.

[0041] Specifically, the extrusion through-hole 13 includes a tensioning through-hole 131 and a fixing through-hole 132. The tensioning through-hole 131 and the fixing through-hole 132 are in communication. The tensioning through-hole 131 is provided on the tensioning portion 11, and the fixing through-hole 132 is provided on the fixing portion 12. The tensioning through-hole 131 is used to accommodate the elastic piece 22, and the fixing through-hole 132 is used to accommodate the tensioning base body 21.

[0042] The shape of the tensioning base body 21 is generally rectangular. The tensioning base body 21 is disposed within the fixing through-hole 132. Arc edges are provided on both the left and right sides of the tensioning base body 21. The arc edges have the same diameter as and are concentric with the side edges of the fixing portion 12, thereby ensuring the smoothness of the surface of the fixing portion 12 after the tensioning base body 21 is installed into the fixing through-hole 132.

[0043] Both the first elastic piece 221 and the second elastic piece 222 are provided on the upper side of the tensioning base body 21 and are disposed opposite to each other. Both the first elastic piece 221 and the second elastic piece 222 are disposed within the tensioning through-hole 131, and portions of the first elastic piece 221 and the second elastic piece 222 respectively extend out from both sides of the tensioning through-hole 131.

[0044] Furthermore, a bending hole 211 is provided on the tensioning base body 21. The shape of the bending hole 211 is in the shape of a water droplet. The bending hole 211 is in communication with the gap between the first elastic piece 221 and the second elastic piece 222. The provision of the bending hole 211 facilitates the pressing of the first elastic piece 221 and the second elastic piece 222 into the tensioning through-hole 131, and increases the bendable range of the first elastic piece 221 and the second elastic piece 222.

[0045] The first elastic piece 221 includes a first elastic piece connecting portion 2211 and a first elastic piece extending portion 2212. The first elastic piece extending portion 2212 is provided on the side of the first elastic piece connecting portion 2211 away from the second elastic piece 222.

[0046] The second elastic piece 222 includes a second elastic piece connecting portion 2221 and a second elastic piece extending portion 2222. The second elastic piece extending portion 2222 is provided on the side of the second elastic piece connecting portion 2221 away from the first elastic piece 221.

[0047] When the tensioning member 2 is disposed within the extrusion through-hole 13, the first elastic piece extending portion 2212 and the second elastic piece extending portion 2222 respectively extend out from the extrusion through-hole 13.

[0048] Specifically, one end of each of the first elastic piece connecting portion 2211 and the second elastic piece connecting portion 2221 is provided on the tensioning base body 21, and the first elastic piece connecting portion 2211 and the second elastic piece connecting portion 2221 are arranged oppositely. The first elastic piece connecting portion 2211 and the second elastic piece connecting portion 2221 are located within the tensioning through hole 131. The first elastic piece extending portion 2212 is provided at one end of the first elastic piece connecting portion 2211 departing from the tensioning base body 21, and the second elastic piece extending portion 2222 is provided at one end of the second elastic piece connecting portion 2221 departing from the tensioning base body 21.

[0049] Furthermore, first guiding inclined surfaces 223 are provided at the upper ends of the first elastic piece extending portion 2212 and the second elastic piece extending portion 2222. The first guiding inclined surfaces 223 are used to guide the nut to be sleeved on the dowel pin 1 and to extrude the first elastic piece extending portion 2212 and the second elastic piece extending portion 2222 into the tensioning through hole 131.

[0050] Even further, second guiding inclined surfaces 224 are provided at the lower ends of the first elastic piece extending portion 2212 and the second elastic piece extending portion 2222. The second guiding inclined surfaces 224 are used to guide the nut to disengage from the dowel pin 1.

[0051] As Figure 1 and Figure 2 shown, the tensioning device for preventing the nut from falling off includes a fixing sleeve 3. The fixing sleeve 3 is sleeved on the fixing portion 12, and the tensioning base body 21 is covered by the fixing sleeve 3.

[0052] Specifically, the overall shape of the fixing sleeve 3 is cylindrical, and the length of the fixing sleeve 3 is equal to the length of the fixing portion 12. A covering hole 31 is provided on the fixing sleeve 3. The covering hole 31 is coaxially arranged with the fixing sleeve 3. The covering hole 31 is a through hole and communicates with both ends of the fixing sleeve 3.

[0053] The diameter of the covering hole 31 is equal to the outer diameter of the fixing portion 12, so that the fixing sleeve 3 can be sleeved on the outer periphery of the fixing portion 12.

[0054] After the fixing sleeve 3 is sleeved on the outer periphery of the fixing portion 12, the fixing sleeve 3 can cover the tensioning base body 21, restricting the movement of the tensioning base body 21, thereby fixing the position of the tensioning member 2 on the dowel pin 1 and improving the stability of the installation of the tensioning member 2.

[0055] When the fixing sleeve 3 is sleeved on the outer periphery of the fixing portion 12, one end of the fixing sleeve 3 is aligned with one end of the fixing portion 12 close to the tensioning portion 11, facilitating the installation of the nut.

[0056] The dowel pin 1 includes a positioning portion 14, and the positioning portion 14 is provided at one end of the fixing portion 12 departing from the tensioning portion 11.

[0057] One end of the fixing sleeve 3 facing away from the tensioning member 2 is provided with a positioning groove 321, and the positioning groove 321 is clamped with the positioning portion 14.

[0058] Specifically, the shape of the positioning portion 14 is generally rectangular. The center of the positioning portion 14 is concentric with the center of the radial cross-section of the fixing portion 12.

[0059] The fixing sleeve 3 further includes a positioning member 32. The shape of the positioning member 32 is generally cylindrical. The positioning member 32 is arranged at one end of the fixing sleeve 3 facing away from the tensioning portion 11, and the positioning member 32 is coaxially arranged with the fixing sleeve 3.

[0060] The positioning groove 321 is arranged at one end of the positioning member 32 facing away from the fixing sleeve 3, and the covering hole 31 is arranged at the bottom of the positioning groove 321.

[0061] The shape of the positioning groove 321 is generally rectangular. The positioning groove 321 is clamped with the positioning portion 14. The tensioning portion 11 and the fixing portion 12 sequentially pass through the covering hole 31 at the bottom of the positioning groove 321 and extend out from the other end of the fixing sleeve 3 until the fixing groove and the fixing portion 12 are clamped, realizing the assembly of the tensioning device for preventing nut from falling off.

[0062] The clamping between the fixing groove and the fixing portion 12 prevents the fixing sleeve 3 from rotating around the outer periphery of the dowel pin 1, improving the overall stability of the tensioning device for preventing nut from falling off.

[0063] The tensioning device for preventing nut from falling off includes a limiting member, and the limiting member abuts against one end of the dowel pin 1 close to the tensioning member 2.

[0064] Specifically, the limiting member is a limiting block. During industrial production, the dowel pin 1 and the fixing sleeve 3 are arranged on the lower die of the mold, and the limiting member is arranged on the upper die of the mold.

[0065] When the nut is sleeved on the tensioning portion 11 and tensioned by the tensioning member 2, the upper die and the lower die move relative to each other and abut. At this time, the limiting member will abut against one end of the tensioning portion 11 facing away from the fixing portion 12, thereby restricting the up-and-down shaking of the nut and improving the stability of nut installation.

[0066] Furthermore, the length of the tensioning portion 11 is less than or equal to the thickness of the nut.

[0067] Specifically, in this embodiment, the thickness of the nut is equal to the length of the tensioning portion 11. In this way, when the limiting member abuts against the tensioning portion 11, it will also abut against the nut. While reducing the longitudinal extrusion damage to the nut, it improves the stability of nut installation and prevents the nut from falling off.

[0068] In summary, a tensioning device for preventing nut from falling off includes an insert pin 1 and a tensioning member 2. The insert pin 1 is cylindrical in shape, and an extrusion through-hole 13 is provided on its side wall. The insert pin 1 is used to sleeved with a nut. The tensioning member 2 is arranged in the extrusion through-hole 13, and part of the tensioning member 2 extends out of the extrusion through-hole 13. The tensioning member 2 has an elastic potential energy to expand outwards, and the tensioning member 2 is used to tension the nut.

[0069] The tensioning member 2 is arranged in the extrusion through-hole 13 and part of the tensioning member 2 extends out of the side wall of the insert pin 1. When the nut is sleeved on the outer periphery of the insert pin 1, the part of the tensioning member 2 extending out of the side wall will be squeezed by the nut and pressed into the extrusion through-hole 13. Since the tensioning member 2 has an elastic potential energy to expand outwards, the tensioning member 2 will tension the nut, thereby fixing the nut on the outer periphery of the insert pin 1, realizing the fixation of the nut, and solving the problem that the nut sleeved on the insert pin 1 is prone to fall off during the injection molding process of the mold.

[0070] It should be noted that, without conflict, the embodiments and features in the embodiments of the present application can be combined with each other.

[0071] It should be noted that the present utility model takes a tensioning device for preventing nut from falling off as an example to introduce the specific structure and working principle of the present utility model. However, the application of the present utility model is not limited to a tensioning device for preventing nut from falling off, and can also be applied to the production and use of other similar workpieces.

[0072] It should be understood that the present utility model is not limited to the precise structure already described and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present utility model is only limited by the appended claims.

[0073] The above are only the preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A tensioning device for preventing nut detachment, characterized in that, Comprising: A dowel pin, with an extrusion through-hole provided on the side wall, and the dowel pin is used for sleeving a nut. A tensioning member, arranged in the extrusion through-hole, and part of the tensioning member extends out of the extrusion through-hole. The tensioning member has an elastic potential energy of expanding outwards, and the tensioning member is used for tensioning the nut.

2. The tensioning device for preventing nut dropout according to claim 1, characterized in that, The dowel pin includes a tensioning portion and a fixing portion. The tensioning portion is arranged on the fixing portion, and the cross-sectional radius of the tensioning portion is smaller than the cross-sectional radius of the fixing portion.

3. The tensioning device for preventing nut detachment according to claim 2, characterized in that, The tensioning member includes a tensioning base body and elastic pieces. The elastic pieces are arranged on the tensioning base body, and the elastic pieces have an elastic potential energy of expanding outwards.

4. The tensioning device for preventing nut dropout according to claim 3, characterized in that The elastic pieces include a first elastic piece and a second elastic piece. Both the first elastic piece and the second elastic piece are arranged on the tensioning base body, and there is an extrusion gap between the first elastic piece and the second elastic piece.

5. The tensioning device for preventing nut from falling off according to claim 4, characterized in that, The first elastic piece includes a first elastic piece connecting portion and a first elastic piece extending portion. The first elastic piece extending portion is arranged on the side of the first elastic piece connecting portion away from the second elastic piece. The second elastic piece includes a second elastic piece connecting portion and a second elastic piece extending portion. The second elastic piece extending portion is arranged on the side of the second elastic piece connecting portion away from the first elastic piece. When the tensioning member is arranged in the extrusion through-hole, the first elastic piece extending portion and the second elastic piece extending portion respectively extend out of the extrusion through-hole.

6. The tensioning device for preventing nut detachment according to claim 5, characterized in that, The extrusion through-hole includes a tensioning through-hole and a fixing through-hole. The tensioning through-hole and the fixing through-hole are communicated. The tensioning through-hole is arranged on the tensioning portion, and the fixing through-hole is arranged on the fixing portion. The tensioning through-hole is used for accommodating the elastic pieces, and the fixing through-hole is used for accommodating the tensioning base body.

7. The tensioning device for preventing nut from falling off according to claim 6, wherein, The tensioning device for preventing the nut from falling off includes a fixing sleeve. The fixing sleeve is sleeved on the fixing portion, and the tensioning base body is covered by the fixing sleeve.

8. The tensioning device for preventing nut dropout according to claim 7, wherein, The dowel pin includes a positioning portion. The positioning portion is arranged at one end of the fixing portion away from the tensioning portion. A positioning groove is arranged at one end of the fixing sleeve away from the tensioning member, and the positioning groove is clamped with the positioning portion.

9. The tensioning device for preventing nut from falling off according to claim 2, characterized in that, The tensioning device for preventing the nut from falling off includes a limiting member. The limiting member abuts against one end of the dowel pin close to the tensioning member.

10. The tensioning device for preventing nut from falling off according to claim 9, characterized in that, The length of the tensioning portion is less than or equal to the thickness of the nut.

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