A plug-in tube stand for an electric bicycle and a processing die thereof

Abstract

The utility model relates to a plug pipe vertical sleeve and its processing die technical field, especially a kind of plug pipe vertical sleeve and its processing die for electric bicycle, including lower die base, four corner of lower die base top surface is respectively provided with guide column, and guide column top surface is provided with upper die base;Upper die base bottom surface is provided with upper die head, and the left die and right die are respectively slidably arranged on the two sides of upper die head, and the left die and right die are used to press-forming to the outside wall of plug pipe vertical sleeve, and the top surface edge of upper die head is provided with several grooves A;Lower die base is provided with lower die head, and plug pipe vertical sleeve is sleeved on lower die head, and the top surface edge of lower die head is provided with several grooves B, and several grooves B and several grooves A are vertically symmetrical, and upper die head moves downward to make groove A and groove B adhere to each other, and the convex point A of the inside wall of plug pipe vertical sleeve body is extruded to form;The plug pipe vertical sleeve can realize interference fit with inner and outer connecting pipe, improve connection tightness, cold pressing is carried out using die at the same time, product size tolerance is small, and the qualified rate is high.

Description

Technical Field

[0001] This utility model relates to the technical field of insertion sleeves and their processing molds, and in particular to an insertion sleeve for electric bicycles and its processing mold. Background Technology

[0002] A stem sleeve is a component that fits over the outside of the frame seat tube and is typically used to mount handlebars or other related components. It connects the handlebars to the frame seat tube, ensuring a tight fit between the two. Stem sleeves are usually designed to be simple, making them easy to install and remove.

[0003] The existing stem sleeve is a stepped annular tubular structure with the same inner diameter but different outer diameters. It is connected to the handlebars and frame stem by fitting inner and outer adapters. However, the connection of the adapters is not firm enough. During the long-term bumpy ride of the electric bicycle, the connection may loosen, causing the handlebars or frame stem to wobble, which affects the riding experience.

[0004] Conventional insertion sleeves are generally machined using turning processes. The original pipe needs to be clamped and fixed on the lathe. When the three-jaw chuck directly clamps the pipe wall, the clamping force may be too large or unevenly distributed, resulting in the sphericity of the insertion sleeve exceeding the tolerance after machining, and local collapse of thin-walled pipes, which reduces the product qualification rate.

[0005] Therefore, this application provides a tube stand for electric bicycles and its processing mold to solve the problems mentioned in the background art. Utility Model Content

[0006] The purpose of this utility model is to provide a tube stand for electric bicycles and its processing mold, which solves the problems of weak connection of existing tube stands and low pass rate of traditional processing methods.

[0007] To solve the above-mentioned technical problems, this utility model provides a tube sleeve for electric bicycles and its processing mold, including a lower mold base, guide posts are respectively provided at the four corners of the top surface of the lower mold base, and an upper mold base is provided on the top surface of the guide posts;

[0008] The upper mold head is set on the bottom surface of the upper mold base. The left mold and the right mold are slidably set on both sides of the upper mold head. The left mold and the right mold are used to press and form the outer wall of the insert sleeve. Several grooves A are set on the edge of the top surface of the upper mold head.

[0009] A lower die head is set on the lower die base. The lower die head is a spherical cylinder. A tube insert sleeve is fitted on the lower die head. Several grooves B are set on the top edge of the lower die head. The grooves B and grooves A are vertically symmetrical. The upper die head moves downward to make the grooves A and B fit together, and the protrusions A on the inner side wall of the tube insert sleeve are extruded and formed.

[0010] A further improvement of this utility model is that: a support plate is provided on the bottom surface of the upper mold base, a fixing plate is provided in the middle of the bottom surface of the support plate, an upper mold head is provided in the middle of the bottom surface of the fixing plate, and several 1 / 4 spherical grooves A are provided at the edge of the bottom surface of the upper mold head.

[0011] A further improvement of this utility model is that: dovetail blocks are symmetrically arranged on both sides of the fixing plate, and the dovetail blocks are adapted to be installed in the dovetail grooves on the top surfaces of the left and right molds.

[0012] The further improvement of this utility model is that: the left mold and the right mold are irregular shapes with the same structure and size, the relative inner walls of the left mold and the right mold are stepped hemispherical arc grooves, a hemispherical groove C is provided in the middle of the side wall of the hemispherical arc groove, a 1 / 4 spherical groove D is provided at the edge of the hemispherical arc groove, and the relative outer walls of the left mold and the right mold are inclined surfaces B.

[0013] A further improvement of this utility model is that: telescopic holes are symmetrically provided on the opposite walls of the left and right molds, and a first spring is provided inside the telescopic holes.

[0014] A further improvement of this utility model is that: a base plate is provided on the top surface of the lower mold base, a lower mold head is provided in the middle of the base plate body, and several 1 / 4 spherical grooves B are provided at the top edge of the lower mold head. The grooves B and grooves A fit together to form a hemispherical groove for pressing to form protrusions A.

[0015] A further improvement of this utility model is that: guide plates are vertically arranged on both sides of the bottom plate on the top surface of the lower mold base. The guide plates are in the shape of right-angled trapezoids. The inclined surface A of the guide plate abuts against the inclined surface B, which is used to restrict the left mold and the right mold from moving downwards while moving towards the lower mold head.

[0016] A further improvement of this utility model is that: several through holes are provided on the base plate body, and a second spring is movably fitted inside the through holes. The second spring is fixedly set on the bottom surface of the demolding template, and a large ball hole is provided in the center of the demolding template. The large ball hole is adapted to fit the lower mold head.

[0017] A further improvement of this utility model is that the lower mold head and the base plate are integrally formed; the support plate, the upper mold head, and the fixing plate are integrally formed.

[0018] A further improvement of this utility model is that: the insertion tube stand is obtained by pressing and deforming an original spherical tube of equal volume. The insertion tube stand is made of metal. The upper part of the insertion tube stand body is a concave annular surface, and the lower part of the body is a convex annular surface. The convex annular surface and the concave annular surface form a stepped structure. Several hemispherical protrusions A are evenly arranged on the inner sidewall of the convex annular surface, and several hemispherical protrusions B are evenly arranged on the outer side of the concave annular surface. Protrusions A and B respectively form an interference fit with the inner and outer connecting tubes.

[0019] By adopting the above technical solution, this utility model has the following beneficial effects:

[0020] 1. This utility model provides a tube sleeve for electric bicycles and its processing mold. The processing mold, through the precise cooperation of the upper mold head, lower mold head, left mold and right mold, wherein the mold cavity formed by the mold together controls the deformation of the tube sleeve, can achieve precise forming of a stepped tube sleeve with protrusions on both the inside and outside, with tolerances controlled within ±0.1mm, and the batch product qualification rate is over 99%. At the same time, by accurately calculating the dimensional deformation after pressing, the volume of the original tube before pressing is equal to the volume of the tube sleeve after pressing. The mold pressing process only changes the shape and size, not the volume. Compared with the turning process, the mold processing saves more materials and reduces material costs.

[0021] 2. This utility model provides a plug sleeve for electric bicycles and its processing mold. The plug sleeve uses a cold pressing process with the mold. When the plug sleeve is deformed under high pressure in a cold state (room temperature), the grains are squeezed, elongated and arranged along the deformation direction to form a dense structure, which can significantly improve the compressive strength by 20%-40% while maintaining good toughness. The cold pressing process does not have the problem of high-temperature oxidation or decarburization. The surface roughness can reach below Ra 0.8μm, eliminating the need for subsequent polishing processes. At the same time, the low temperature environment suppresses the thermal expansion and contraction effect, and the dimensional tolerance of the formed parts can be controlled within ±0.05mm. Cold pressing does not require heating equipment, reducing energy consumption by 60%-70% and producing no exhaust emissions, which is in line with the trend of low-carbon manufacturing.

[0022] 3. The present invention provides a tube sleeve for electric bicycles and its processing mold. The lower mold head and the upper mold head are adapted to penetrate the inner cavity of the tube sleeve. The lower mold head and the upper mold head are respectively provided with 1 / 4 ball grooves. The groove A of the upper mold head and the groove B of the lower mold head fit together to form a hemispherical groove, which is conducive to the extrusion to form the protrusion A on the inner wall of the tube sleeve, and at the same time facilitates the demolding of the protrusion A, thereby improving the demolding efficiency.

[0023] 4. This utility model provides a tube sleeve for electric bicycles and its processing mold. The left mold and the right mold are respectively movably mounted on the dovetail block on the upper mold base. While the upper mold head moves downward together, the left mold and the right mold move inward relative to each other on the dovetail block, pressing the outer wall of the tube sleeve into a stepped layer structure. At the same time, grooves C and D are respectively provided on the inner sidewalls of the left mold and the right mold to press and form the protrusions B on the outer wall of the tube sleeve. A first spring is provided between the left mold and the right mold, so that after pressing, the first spring applies elastic force to the left mold and the right mold to both sides, which is conducive to the relative displacement of the left mold and the right mold until they are completely separated.

[0024] 5. The present invention provides a tube sleeve for electric bicycles and its processing mold. A second spring is fixedly installed on the bottom surface of the demolding template. During the pressing process, the second spring contracts downward. After pressing, the upper mold base rises and the second spring recovers its elasticity, which lifts the demolding template upward, making it easier for the tube sleeve to be demolded from the upper mold head. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is an overall schematic diagram of a plug sleeve for electric bicycles and its processing mold;

[0027] Figure 2 A schematic diagram of the original pipe fittings and the insertion sleeve;

[0028] Figure 3 This is a schematic diagram of the upper mold base;

[0029] Figure 4 Schematic diagram of the support plate

[0030] Figure 5 This is an enlarged view of the upper mold head;

[0031] Figure 6 This is a structural diagram of the left and right molds;

[0032] Figure 7 This is a schematic diagram of the hemispherical arc groove structure;

[0033] Figure 8 This is a schematic diagram of the lower mold base.

[0034] Figure 9 This is a structural diagram of the base plate and the formwork.

[0035] Figure 10 Enlarged view of the lower die head;

[0036] Figure 11 This is a diagram showing the mold closing state.

[0037] Reference numerals: 1. Insert sleeve; 111. Protrusion A; 121. Protrusion B; 2. Lower mold base; 21. Lower mold head; 211. Groove B; 22. Base plate; 221. Through hole; 23. Second spring; 24. Release plate; 241. Large ball hole; 3. Upper mold base; 31. Upper mold head; 311. Groove A; 32. Left mold; 33. Right mold; 331. Dovetail groove; 332. Hemispherical arc groove; 333. Groove C; 334. Groove D; 335. Inclined surface B; 336. Telescopic hole; 337. First spring; 34. Support plate; 35. Fixing plate; 351. Dovetail block; 4. Guide post; 5. Guide plate; 51. Inclined surface A; 6. Original pipe fitting. Detailed Implementation

[0038] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0039] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0041] The present invention will be further explained below with reference to specific embodiments.

[0042] like Figures 1-11As shown, this embodiment provides a processing mold for a tube sleeve for electric bicycles, including a lower mold base 2, with guide posts 4 respectively set at the four corners of the top surface of the lower mold base 2; an upper mold base 3 is set on the top surface of the guide posts 4; an upper mold head 31 is set on the bottom surface of the upper mold base 3, and a left mold 32 and a right mold 33 are slidably set on both sides of the upper mold head 31 respectively. The left mold 32 and the right mold 33 are used to press and form the outer wall of the tube sleeve 1. Several grooves A311 are set on the edge of the top surface of the upper mold head 31; a lower mold head 21 is set on the lower mold base 2, and the tube sleeve 1 is fitted on the lower mold head 21. Several grooves B211 are set on the edge of the top surface of the lower mold head 21. The grooves B211 and the grooves A311 are vertically symmetrical. The upper mold head 31 moves downward to make the grooves A311 fit with the grooves B211, and extrudes and forms the protrusions A111 on the inner wall of the tube sleeve 1; specifically, the top surface of the upper mold base 3 is connected to a hydraulic device. The guide column 4 is connected to the lower mold base 2 and the upper mold base 3 at both ends. The upper mold base 3 can be driven to move downward along the guide column 4 by a hydraulic device. The guide column 4 and the hydraulic device are existing devices, and their specific structures and working principles will not be described in detail. The upper mold head 31 is fixed to the bottom surface of the upper mold base 3 by bolts. The upper mold head 31 is a spherical column structure. During the downward movement of the upper mold base 3, the upper mold head 31 fits and abuts against the inner cavity of the original pipe fitting 6. The left mold 32 and the right mold 33 slide inward on the dovetail block 351 respectively. At the same time, the left mold 32 and the right mold 33 move downward and inward along the inclined surface A51 of the guide plate 5. After the mold is closed, the mold cavity formed by the upper mold head 31, the lower mold head 21, the left mold 32 and the right mold 33 controls the size and shape of the original pipe fitting 6 after deformation. It can achieve precise forming of the stepped insertion sleeve 1 with protrusions on both the inside and outside. The tolerance can be controlled within ±0.1mm, and the batch product qualification rate reaches 99%.

[0043] like Figures 3-7As shown, in this embodiment, a support plate 34 is provided on the bottom surface of the upper mold base 3, a fixing plate 35 is provided in the middle of the bottom surface of the support plate 34, and an upper mold head 31 is provided in the middle of the bottom surface of the fixing plate 35. The upper mold head 31 is a spherical cylinder, and several 1 / 4 spherical grooves A311 are provided at the bottom edge of the upper mold head 31. Dovetail blocks 351 are symmetrically provided on both sides of the fixing plate 35, and the dovetail blocks 351 are adapted to be installed in the dovetail grooves 331 on the top surface of the left mold 32 and the right mold 33. Specifically, the support plate 34 is a square plate, the fixing plate 35 is integrally provided on the bottom surface of the support plate 34, and the upper mold head 31 is integrally provided on the bottom surface of the fixing plate 35. The fixing plate 35 is a spherical plate. After the mold is closed, the outer arc side of the fixing plate 35 The upper arc-shaped inner wall of the left mold 32 and right mold 33 is abutted against, providing support and protection for the left mold 32 and right mold 33; the upper mold head 31 is a spherical cylinder, and four 1 / 4 spherical grooves A311 are provided at the bottom edge of the upper mold head 31. The upper mold head 31 is used to fit into the inner cavity of the original butler 6. The side wall of the upper mold head 31 fits against the top of the concave annular surface. The dovetail block 351 is a trapezoidal structure with a larger top and bottom. The two dovetail blocks 351 are respectively fitted into the dovetail grooves 331 on the top surface of the left mold 32 and right mold 33. The left mold 32 and right mold 33 can slide horizontally on the dovetail block 351, effectively controlling the left mold 32 and right mold 33 to move downward while moving towards the center position.

[0044] like Figure 3 , Figure 4 , Figure 6 , Figure 7 , Figure 11As shown, in this embodiment, the left mold 32 and the right mold 33 are irregularly shaped structures with the same structure and size. The inner sidewalls of the left mold 32 and the right mold 33 are both stepped hemispherical arc grooves 332. A hemispherical groove C333 is provided in the middle of the sidewall of the hemispherical arc groove 332, and a 1 / 4 spherical groove D334 is provided at the edge of the hemispherical arc groove 332. The outer sidewalls of the left mold 32 and the right mold 33 are both inclined surfaces B335. Expansion holes 336 are symmetrically provided on both sides of the opposite walls of the left mold 32 and the right mold 33, and a first spring 337 is provided in the expansion holes 336. Specifically, the hemispherical arc groove 332 is a stepped layered structure used to adapt to the stepped outer sidewall of the forming insertion sleeve 1. A hemispherical groove C333 is provided in the middle of the upper sidewall of the hemispherical arc groove 332, and a 1 / 4 spherical groove D334 is provided at the edge of the left mold 32 and the right mold 33. After the mold is closed, a hemispherical groove C333 is formed. The hemispherical groove C333 is used to press and form the protrusion B121. After the mold is closed, the first spring 337 contracts and stores elastic potential energy in the telescopic hole 336. At the same time, the left mold 32 and the right mold 33 are completely fitted together. At this time, the hemispherical groove C333 of the left mold 32 and the right mold 33 abut against the outer wall of the insertion tube sleeve 1, pressing the outer wall of the insertion tube sleeve 1 into a stepped layer structure. Meanwhile, grooves C333 and D334 are respectively set on the inner sidewalls of the left mold and the right mold to press and form the protrusion B121 on the outer wall of the insertion tube sleeve. When demolding, the upper mold base 3 moves upward, and the first spring 337 releases elastic potential energy at the same time to push the left mold 32 and the right mold 33 to both sides, so that the left mold 32 and the right mold 33 are separated from the outer wall of the insertion tube sleeve 1, and the demolding process is completed quickly and conveniently.

[0045] like Figures 8-11As shown, in this embodiment, a base plate 22 is provided on the top surface of the lower mold base 2, and a lower mold head 21 is provided in the middle of the base plate 22 body. Several 1 / 4 spherical grooves B211 are provided at the top edge of the lower mold head 21. The grooves B211 and grooves A311 fit together to form hemispherical grooves for pressing to form protrusions A111. Guide plates 5 are vertically provided on both sides of the base plate 22 on the top surface of the lower mold base 2. The guide plates 5 are right-angled trapezoids. The inclined surface A51 of the guide plate 5 abuts against the inclined surface B335 to restrict the left mold 32 and the right mold 33 from moving downwards, while simultaneously moving towards the lower mold head 21. Several through holes 221 are provided on the base plate 22 body. A second spring 23 is movably fitted in the through holes 221. Two springs 23 are fixedly mounted on the bottom surface of the ejector plate 24. A large ball hole 241 is provided in the center of the ejector plate 24, which is adapted to fit the lower die head 21. Specifically, the lower die base 2 has a fixed base plate 22 and a guide plate 5 by bolts. The inclined surface A51 of the guide plate 5 is used to abut against the inclined surface B335 of the opposite outer side wall of the left die 32 and the right die 33, so that the left die 32 and the right die 33 move downward and inward respectively against the inclined surface A51. The lower die head 21 is integrally mounted on the top surface of the base plate 22. The lower die head 21 is a spherical column. The outer diameter of the lower die head 21 is equal to that of the upper die head 31. The upper part of the lower die head 21 has a stepped layer structure. This stepped layer is used to support half the wall thickness of the original pipe fitting 6. Four quarter-spherical grooves B211 are evenly arranged at the top edge of the mold head 21. Grooves B211 and four quarter-spherical grooves A311 are arranged symmetrically on the bottom edge of the upper mold head 31. After the mold is closed, grooves B211 and A311 form a hemispherical groove for pressing the protrusions A111. Guide plates 5 are vertically arranged on both sides of the bottom plate 22. The guide plates 5 have a guiding and limiting function for the left mold 32 and the right mold 33. A demolding template 24 is fitted on the lower mold head 21. The demolding template 24 supports the other half of the wall thickness of the original pipe fitting 6, which facilitates the upward movement of the demolding template 24 when it is lifted upward by the second spring 23, thereby driving the insertion sleeve 1 to move upward and detach from the lower mold head 21, improving demolding efficiency. The bottom end of the demolding template 24 is evenly arranged Six second springs 23 are evenly installed. A positioning pin inserted from the bottom end of the lower mold base 2 passes through the hollow cavity of the second spring 23 and is screwed to the second spring 23 for fixation. The positioning pin can move up and down in the positioning pin hole of the lower mold base 2. Before the mold is closed, there is a gap between the demolding template 24 and the base plate 22 under the support of the second spring 23. After the mold is closed, the second spring 23 is pressed into the six through holes 221 on the body of the base plate 22 and retracts. The demolding template 24 and the base plate 22 are completely in contact. When demolding, the upper mold head 31 moves upward, the second spring 23 extends upward, and the demolding template 24 is lifted upward, so that the tube sleeve 1 on the demolding template 24 is lifted and disengaged from the lower mold head 21, realizing the automatic demolding of the tube sleeve 1.

[0046] like Figures 1-2As shown, this embodiment provides a plug sleeve for electric bicycles, including a plug sleeve 1. The plug sleeve 1 is obtained by pressing and deforming an original spherical tube 6 of equal volume. The plug sleeve 1 is made of metal. The upper part of the plug sleeve 1 body is a concave annular surface, and the lower part of the body is a convex annular surface. The convex and concave annular surfaces form a stepped structure. Several hemispherical protrusions A111 are uniformly arranged on the inner sidewall of the convex annular surface, and several hemispherical protrusions B121 are uniformly arranged on the outer side of the concave annular surface. Protrusions A111 and B121 form an interference fit with the inner and outer connecting tubes, respectively. Specifically, the plug sleeve 1 uses a mold and a cold pressing process. When the plug sleeve 1 is subjected to high pressure deformation in a cold state (room temperature), the grains are squeezed, elongated, and arranged along the deformation direction to form a dense structure, which can significantly improve the compressive strength by 20%-40% while maintaining good toughness. The cold pressing process does not have the problem of high-temperature oxidation or decarburization, and the surface roughness can reach Ra. Below 0.8μm, the subsequent polishing process is eliminated. At the same time, the low temperature environment suppresses the thermal expansion and contraction effect, and the dimensional tolerance of the molded parts can be controlled within ±0.05mm. Cold pressing does not require heating equipment, reducing energy consumption by 60%-70% and producing no waste gas emissions, which is in line with the trend of low-carbon manufacturing.

[0047] This utility model provides a working principle for a die for processing a tube insert sleeve for electric bicycles: In use, the operator uses tweezers to place the original tube 6 onto the lower die head 21. The hydraulic device is then activated, driving the upper die seat 3 downwards along the guide post 4. The upper die seat 3 drives the upper die head 31 downwards and inserts it into the inner cavity of the original tube 6. Simultaneously, the left die 32 and right die 33 abut against the inclined surface A51 downwards and towards the center until they are in contact with each other, completing the die closing. At this point, the tube insert sleeve 1 is pressed and formed. Then, the hydraulic device drives... The upper mold base 3 moves upward along the guide post 4, causing the upper mold head 31 to disengage from the insertion sleeve 1. At the same time, under the action of the first spring 337, the left mold 32 and the right mold 33 are pushed to the sides respectively, causing the left mold 32 and the right mold 33 to disengage from the outer wall of the insertion sleeve 1. The left mold 32 and the right mold 33 move upward together with the upper mold base 3. At the same time, the second spring 23 extends upward, causing the demolding template 24 to spring upward away, thereby causing the insertion sleeve 1 on the demolding template 24 to disengage from the lower mold head 21, realizing automatic demolding of the insertion sleeve 1 and improving demolding efficiency.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A die for processing a tube insert sleeve for an electric bicycle, characterized in that, It includes a lower mold base (2), guide pillars (4) are set at the four corners of the top surface of the lower mold base (2), and an upper mold base (3) is set on the top surface of the guide pillars (4); The upper mold base (3) is provided with an upper mold head (31) on the bottom surface. The left mold (32) and the right mold (33) are slidably provided on both sides of the upper mold head (31). The left mold (32) and the right mold (33) are used to press and form the outer wall of the insertion tube sleeve (1). Several grooves A (311) are provided on the edge of the top surface of the upper mold head (31). The lower die holder (2) is provided with a lower die head (21), and the insert sleeve (1) is fitted on the lower die head (21). Several grooves B (211) are provided at the top edge of the lower die head (21). The grooves B (211) and the grooves A (311) are vertically symmetrical. The upper die head (31) moves downward to make the grooves A (311) fit with the grooves B (211) and extrude the protrusions A (111) on the inner side wall of the insert sleeve (1) body.

2. The die for processing the insert sleeve of an electric bicycle according to claim 1, characterized in that, A support plate (34) is provided on the bottom surface of the upper mold base (3). A fixing plate (35) is provided in the middle of the bottom surface of the support plate (34). An upper mold head (31) is provided in the middle of the bottom surface of the fixing plate (35). The upper mold head (31) is a spherical column. Several 1 / 4 spherical grooves A (311) are provided at the edge of the bottom surface of the upper mold head (31).

3. The die for processing the insert sleeve of an electric bicycle according to claim 2, characterized in that, Dovetail blocks (351) are symmetrically arranged on both sides of the fixing plate (35), and the dovetail blocks (351) are adapted to be installed in the dovetail grooves (331) on the top surface of the left mold (32) and the right mold (33).

4. The die for processing the insert sleeve of an electric bicycle according to claim 3, characterized in that, The left mold (32) and the right mold (33) are irregular shapes with the same structure and size. The inner sidewalls of the left mold (32) and the right mold (33) are stepped hemispherical arc grooves (332). A hemispherical groove C (333) is provided in the middle of the sidewall of the hemispherical arc groove (332). A 1 / 4 spherical groove D (334) is provided at the edge of the hemispherical arc groove (332). The grooves C (333) and D (334) are used to extrude and form the protrusion B (121). The outer sidewalls of the left mold (32) and the right mold (33) are inclined surfaces B (335).

5. The die for processing the insert sleeve of an electric bicycle according to claim 4, characterized in that, The left mold (32) and the right mold (33) have symmetrically arranged telescopic holes (336) on their opposite walls, and a first spring (337) is arranged inside the telescopic hole (336).

6. The die for processing the insert sleeve of an electric bicycle according to claim 1, characterized in that, The bottom plate (22) is set on the top surface of the lower mold base (2). The lower mold head (21) is set in the middle of the body of the bottom plate (22). The lower mold head (21) is a spherical column. Several 1 / 4 spherical grooves B (211) are set at the top edge of the lower mold head (21). The grooves B (211) and grooves A (311) fit together to form a hemispherical groove for pressing to form protrusions A (111).

7. The die for processing the insert sleeve of an electric bicycle according to claim 6, characterized in that, The top surface of the lower mold base (2) is located on both sides of the base plate (22) and the guide plates (5) are vertically arranged. The guide plates (5) are right-angled trapezoids. The inclined surface A (51) of the guide plate (5) abuts against the inclined surface B (335) to restrict the left mold (32) and the right mold (33) from moving downwards and moving towards the lower mold head (21) respectively.

8. The die for processing the insert sleeve of an electric bicycle according to claim 7, characterized in that, The base plate (22) has several through holes (221) on its body. A second spring (23) is movably fitted inside the through holes (221). The second spring (23) is fixedly set on the bottom surface of the demolding template (24). A large ball hole (241) is set in the center of the demolding template (24). The large ball hole (241) is adapted to fit the lower mold head (21).

9. The die for processing the insert sleeve of an electric bicycle according to claim 8, characterized in that, The lower mold head (21) and the base plate (22) are integrally formed; the support plate (34), the upper mold head (31) and the fixing plate (35) are integrally formed.

10. A plug sleeve for an electric bicycle, characterized in that, The device includes a tube sleeve (1), which is obtained by pressing and deforming a spherical tube-shaped original tube (6) of equal volume. The tube sleeve (1) is made of metal. The upper part of the tube sleeve (1) body is a concave annular surface, and the lower part of the body is a convex annular surface. The convex annular surface and the concave annular surface form a stepped structure. Several hemispherical protrusions A (111) are evenly arranged on the inner side wall of the convex annular surface, and several hemispherical protrusions B (121) are evenly arranged on the outer side of the concave annular surface. Protrusions A (111) and B (121) form an interference fit with the inner and outer connecting tubes, respectively.

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