Inner chamfer forming tool for rubber pipe
By using mandrel and limit structure in the inner chamfering forming tooling of hose, combined with the heating environment, the hose naturally forms chamfer, which solves the problem of droplets and burrs during grinding, and improves the safety and effect of hose use.
Patent Information
- Application Number
- CN202421732231.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-22
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-07-22
AI Technical Summary
During the existing internal chamfering process of hose, grinding method will cause rubber droplets on the surface of the hose and burr-like patterns on the inner wall, thereby damaging the automobile circulation system.
A kind of inner chamfer forming tooling for hose is adopted, including a mandrel and a limiting structure. The mandrel is equipped with an annular boss and an inclined surface. The limiting structure forms an annular limiting groove. By deforming the hose under heat in the heating environment, chamfers are naturally formed to avoid the grinding process.
Effectively prevent rubber droplets from adhering to the surface of the hose and creating burr-like patterns, reduce the risk of damage to the automobile circulation system, and improve the use effect of the hose.
Smart Images
Figure CN222904202U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of rubber hose processing, in particular to a rubber hose inner chamfer forming tooling. Background Art
[0002] Rubber hoses used in fields such as automobiles usually need to be processed with inner chamfers between their ends and inner walls. The existing rubber hose inner chamfer processing process is carried out by using a special inner chamfer processing device. Specifically, the inner chamfer processing device includes a motor and a positioning jig and a cutter that are opposite in position. When processing the inner chamfer, first place the rubber hose in the positioning jig and make the rubber hose concentric with the cutter, and then move the positioning jig close to the cutter until the end of the rubber hose on the positioning jig is sleeved outside the cutter. At the same time, the motor needs to be started, and the motor drives the cutter to rotate, so as to grind the inner wall at the end of the rubber hose to form an inner chamfer.
[0003] However, after the inner chamfer is formed by grinding, rubber droplets will be generated on the surface of the rubber hose, and burr-like patterns will be generated on the inner wall of the rubber hose. Both the burr-like patterns and the uncleaned droplets will cause damage to the automotive circulation system (such as the cooling system, heat dissipation system, heating system, fuel system) when the rubber hose is applied to an automobile. Summary of the Utility Model
[0004] The purpose of the utility model is to provide a rubber hose inner chamfer forming tooling to alleviate the technical problems existing in the prior art that the inner chamfer of the rubber hose is usually formed by grinding with a cutter on the inner chamfer processing device, resulting in rubber droplets on the surface of the rubber hose and burr-like patterns on the inner wall of the rubber hose, and both the burr-like patterns and the uncleaned droplets will cause damage to the automotive circulation system when the rubber hose is applied to an automobile.
[0005] In a first aspect, the utility model provides a rubber hose inner chamfer forming tooling, including a mandrel and a limiting structure;
[0006] At least at a position near one end of the mandrel, there is an annular boss extending along its circumferential direction. The side of the boss close to the middle of the mandrel is an inclined surface, and this inclined surface inclines in a direction away from the middle of the mandrel from the side located at the inner edge of the ring of the boss to the side located at the outer edge of the ring;
[0007] The limiting structure includes a fixing part and an annular limiting part. The fixing part is fixed on the mandrel and is located on the side of the inclined surface away from the middle of the mandrel. The limiting part is wound around the circumferential side of the inclined surface, and an annular limiting groove is formed between the inner wall of the limiting part, the inclined surface, and the outer wall of the mandrel;
[0008] The mandrel is used to be inserted into the rubber hose to be processed. The limiting groove is used to accommodate the end of the rubber hose, and the inclined surface is used to abut against the inner wall of the rubber hose near its end.
[0009] In an alternative embodiment, bosses are respectively provided at positions near one end and near the other end of the mandrel, and there are two limiting structures. The two limiting structures are arranged corresponding to the two bosses.
[0010] The fixing part of at least one of the limiting structures is detachably connected to the mandrel.
[0011] In an alternative embodiment, the two ends of the mandrel are respectively a head end and a tail end. The boss near the tail end of the mandrel is a lower boss, the inclined surface of the lower boss is a lower inclined surface, and the limiting structure corresponding to the lower boss is a lower limiting structure.
[0012] The side surface of the lower boss facing away from the lower inclined surface is an abutting surface, and the abutting surface is spaced from the tail end of the mandrel.
[0013] The lower limiting structure includes an inner tube body and an outer tube body. The inner tube body is the fixing part of the lower limiting structure. The inner tube body is sleeved on the rod body between the tail end of the mandrel and the abutting surface, and the end surface of the inner tube body away from the tail end of the mandrel abuts against the abutting surface.
[0014] The outer tube body is sleeved outside the inner tube body, and the end surface of the outer tube body away from the tail end of the mandrel is located on the side of the lower inclined surface away from the tail end of the mandrel. The tube body between the end of the outer tube body away from the tail end of the mandrel and its corresponding position with the abutting surface is the limiting part of the lower limiting structure.
[0015] In an alternative embodiment, the outer tube body is slidably connected to the inner tube body along the axial direction of the mandrel.
[0016] In an alternative embodiment, an inner limiting hole extending radially along the inner tube body is provided on the inner tube body, and an outer limiting hole extending radially along the outer tube body is provided on the outer tube body. The inner limiting hole and the outer limiting hole are used to communicate when the end surface of the outer tube body away from the tail end of the mandrel is located on the side of the lower inclined surface away from the tail end of the mandrel, and a limiting rod is inserted through the communicated inner limiting hole and outer limiting hole.
[0017] In an alternative embodiment, a sliding groove extending axially along the outer wall of the inner tube body is provided, and a sliding protrusion extending axially along the inner wall of the outer tube body is provided. The sliding protrusion is arranged in the sliding groove.
[0018] In an alternative embodiment, a dial is provided on the outer wall of the outer tube body.
[0019] In an alternative embodiment, the boss near the first end of the mandrel is an upper boss, the inclined surface of the upper boss is an upper inclined surface, and the limiting structure correspondingly arranged with the upper boss is an upper limiting structure;
[0020] The upper limiting structure includes an upper tube body, which can pass through the first end of the mandrel and then be sleeved outside the mandrel, and the end surface of the upper tube body far from the first end of the mandrel can extend to the side of the upper inclined surface far from the first end of the mandrel;
[0021] The tube body of the upper tube body between the first end of the mandrel and the upper boss is the fixed part of the upper limiting structure, and the remaining tube body is the limiting part of the upper limiting structure.
[0022] In an alternative embodiment, a limiting piece is provided at the first end of the mandrel, and an annular groove extending along the circumferential direction of the mandrel is provided at the connection between the limiting piece and the first end of the mandrel;
[0023] The end of the upper tube body near the first end of the mandrel is a fixed end. A retaining piece is provided at the inner edge on one side of the fixed end, and an opening for the limiting piece to pass through is left between the inner edge on the other side and the retaining piece;
[0024] The retaining piece is used to be located at the annular groove after the upper tube body is sleeved outside the mandrel, and to be axially abutted against the limiting piece along the upper tube body after the upper tube body rotates relative to the mandrel.
[0025] In an alternative embodiment, an arc chamfer is provided between the side of the limiting part near the middle of the mandrel and its inner wall.
[0026] The inner chamfer forming tooling for rubber hoses provided by the utility model comprises a mandrel and a limiting structure; at least at a position near one end of the mandrel, there is an annular boss extending along its circumferential direction, and the side surface of the boss near the middle of the mandrel is an inclined surface, and this inclined surface inclines in the direction away from the middle of the mandrel from the side located at the inner edge of the ring of the boss to the side located at the outer edge of the ring; the limiting structure comprises a fixing part and an annular limiting part, the fixing part is fixed on the mandrel and is located on the side of the inclined surface away from the middle of the mandrel, the limiting part is wound around the circumferential side of the inclined surface, and an annular limiting groove is formed between the inner wall of the limiting part, the inclined surface and the outer wall of the mandrel; the mandrel is used to be inserted into the rubber hose to be processed, the limiting groove is used to accommodate the end of the rubber hose, and the inclined surface is used to abut against the inner wall of the rubber hose near its end. The inner chamfer forming tooling for rubber hoses provided by the utility model is used to process and form a chamfer at the inner wall of the rubber hose near its end. During use, the rubber hose to be processed can be sleeved outside the mandrel first, and at the same time, the end of the rubber hose is made to extend into the limiting groove. Since the fixing part in the limiting structure is located on the side of the inclined surface away from the middle of the mandrel, the fixing part will not hinder the process of the end of the rubber hose entering the limiting groove. Also, since the limiting part in the limiting structure is wound around the circumferential side of the inclined surface, the annular limiting groove formed between the inner wall of the limiting part, the inclined surface and the outer wall of the mandrel can not only limit the axial position of the end of the rubber hose, but also limit the radial position of the hose body of the rubber hose near its end. After the end of the rubber hose extends into the limiting groove, the mandrel and the rubber hose are both placed in a heating environment. For example, at this time, the rubber hose can be subjected to the next vulcanization treatment. During the vulcanization process, the mandrel and the rubber hose will be in the heating environment at the same time. Since the rubber hose is usually made of materials such as rubber that can be deformed by heat, in the heating environment, the rubber hose will be deformed by heat. At this time, under the limiting action of the limiting groove, the hose body of the rubber hose near its end is difficult to deform outward along its radial direction and is also difficult to deform outward along its axial direction, which can ensure that the shape of the rubber hose remains unchanged. However, at this time, the inner wall of the rubber hose near its end abuts against the inclined surface of the annular boss, and the inclined surface inclines in the direction away from the middle of the mandrel from the side located at the inner edge of the ring of the boss to the side located at the outer edge of the ring. Therefore, after the inner wall of the rubber hose near its end is deformed by heat, its shape will conform to the inclined surface, thus naturally forming a chamfer, without grinding the inner wall of the rubber hose near the end, and thus no rubber droplets and burr-like patterns will be generated. When the rubber hose is applied to an automobile, it is not easy to cause damage to the automobile circulation system (such as the cooling system, the heat dissipation system, the heating system, the fuel system).
[0027] Compared with the prior art, the inner chamfer forming tooling for rubber hoses provided by the utility model can, by inserting the mandrel into the rubber hose to be processed and making the inclined surface abut against the inner wall of the rubber hose near its end, combine with the heating environment to make the inner wall of the rubber hose near the end naturally deformed by heat to form a chamfer, without grinding the rubber hose, thereby effectively preventing rubber droplets from adhering to the surface of the rubber hose and generating burr-like patterns. Description of the Drawings
[0028] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0029] Figure 1 The front view of the mandrel provided by the embodiment of the present invention;
[0030] Figure 2 The cross-sectional view of the inner chamfer forming tooling for the rubber hose provided by the embodiment of the present invention;
[0031] Figure 3 For Figure 2 The enlarged schematic view of part A in
[0032] Figure 4 For Figure 2 The enlarged schematic view of part B in
[0033] Figure 5 The front view of the lower limit structure provided by the embodiment of the present invention;
[0034] Figure 6 The cross-sectional view of the lower limit structure provided by the embodiment of the present invention;
[0035] Figure 7 The cross-sectional view of the outer tube body in the lower limit structure provided by the embodiment of the present invention;
[0036] Figure 8 The side view of the outer tube body in the lower limit structure provided by the embodiment of the present invention;
[0037] Figure 9 The cross-sectional view of the inner tube body in the lower limit structure provided by the embodiment of the present invention;
[0038] Figure 10 The front view of the upper limit structure provided by the embodiment of the present invention;
[0039] Figure 11 The cross-sectional view of the upper limit structure provided by the embodiment of the present invention;
[0040] Figure 12 The top view of the mandrel provided by the embodiment of the present invention.
[0041] Icons: 1 - mandrel; 10 - lower boss; 100 - lower inclined surface; 101 - abutting surface; 11 - upper boss; 110 - upper inclined surface; 2 - limiting groove; 3 - lower limiting structure; 30 - inner tube body; 300 - inner limiting hole; 301 - sliding groove; 31 - outer tube body; 310 - outer limiting hole; 311 - sliding protrusion; 312 - dial; 4 - upper limiting structure; 40 - upper tube body; 41 - retaining piece; 410 - opening; 5 - limiting piece; 50 - annular groove; 6 - arc chamfer. Detailed implementation manners
[0042] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated herein can be arranged and designed in various different configurations.
[0043] Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the present utility model claimed, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.
[0044] The following will describe in detail some implementation manners of the present utility model with reference to the accompanying drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.
[0045] Embodiment:
[0046] As Figure 1 , Figure 2 , Figure 3 and Figure 4 shown, the rubber hose inner chamfering forming tooling provided in this embodiment includes a mandrel 1 and a limiting structure; at least a position near one end of the mandrel 1 is provided with an annular boss extending along its circumferential direction, and the side surface of the boss near the middle of the mandrel 1 is an inclined surface, and this inclined surface is inclined in a direction away from the middle of the mandrel 1 from the side located at the inner edge of the ring of the boss to the side located at the outer edge of the ring; the limiting structure includes a fixing part and an annular limiting part, the fixing part is fixed on the mandrel 1 and is located on the side of the inclined surface away from the middle of the mandrel 1, the limiting part is wound around the circumferential side of the inclined surface, and an annular limiting groove 2 is formed between the inner wall of the limiting part, the inclined surface and the outer wall of the mandrel 1; the mandrel 1 is used to be inserted into the rubber hose to be processed, the limiting groove 2 is used to accommodate the end of the rubber hose, and the inclined surface is used to abut against the inner wall of the rubber hose near its end.
[0047] The rubber hose inner chamfer forming tooling provided in this embodiment is used to process and form a chamfer on the inner wall of the rubber hose near its end. During use, the rubber hose to be processed can be sleeved outside the mandrel 1, and at the same time, the end of the rubber hose extends into the limit groove 2. As Figures 2 - 4 shown, since the fixing part in the limiting structure is located on one side of the inclined surface far from the middle of the mandrel 1, the fixing part will not hinder the process of the end of the rubber hose entering the limit groove 2. Also, since the limiting part in the limiting structure is wound around the circumferential side of the inclined surface, the annular limit groove 2 formed between the inner wall of the limiting part, the inclined surface and the outer wall of the mandrel 1 can not only limit the axial position of the end of the rubber hose, but also limit the radial position of the hose body near its end. After the end of the rubber hose extends into the limit groove 2, the mandrel 1 and the rubber hose are both placed in a heating environment. For example, at this time, the rubber hose can be subjected to the next vulcanization treatment. During the vulcanization process, the mandrel 1 and the rubber hose will be in the heating environment at the same time.
[0048] Since the rubber hose is usually made of materials such as rubber that can be deformed by heat, in the heating environment, the rubber hose will be deformed by heat. At this time, under the limiting action of the limit groove 2, the hose body near the end of the rubber hose is difficult to deform outward along its radial direction and is difficult to deform outward along its axial direction, which can ensure the shape of the rubber hose remains unchanged. However, at this time, the inner wall of the rubber hose near its end abuts against the inclined surface of the annular boss, and the inclined surface slopes away from the middle of the mandrel 1 from the side located at the inner edge of the ring of the boss to the side located at the outer edge of the ring. Therefore, after the inner wall of the rubber hose near its end is deformed by heat, its shape will conform to the inclined surface, thus naturally forming a chamfer without grinding the inner wall of the rubber hose near the end, and thus no rubber droplets and burr-like patterns will be generated. When the rubber hose is applied to an automobile, it is not easy to cause damage to the automobile circulation system (such as the cooling system, heat dissipation system, heating system, fuel system).
[0049] Compared with the prior art, the rubber hose inner chamfer forming tooling provided in this embodiment passes the mandrel 1 through the rubber hose to be processed and makes the inclined surface abut against the inner wall of the rubber hose near its end, and can combine the heating environment to make the inner wall of the rubber hose near the end naturally deformed by heat to form a chamfer without grinding the rubber hose, thereby effectively preventing rubber droplets from adhering to the surface of the rubber hose and generating burr-like patterns.
[0050] It should be noted that when only one boss is provided on the mandrel 1, only one end of the rubber hose can be chamfered. At this time, the other end of the rubber hose still needs to be chamfered by grinding. However, at this time, the rubber hose inner chamfer forming tooling can still reduce rubber droplets and burr-like patterns and improve the use effect of the rubber hose.
[0051] However, in order to improve the processing efficiency of the inner chamfer of the rubber hose and completely avoid grinding, in this embodiment, bosses are preferably provided at positions near one end and near the other end of the mandrel 1, and there are two limiting structures, and the two limiting structures are arranged corresponding to the two bosses; the fixing part of at least one limiting structure is detachably connected to the mandrel 1.
[0052] Among them, the two bosses are respectively used to process inner chamfers at the two ends of the rubber hose, and the fixing part of at least one limiting structure is detachably connected to the mandrel 1, so that the fixing part of one of the limiting structures can be separated from the mandrel 1, preventing the rubber hose from being unable to be sleeved on the mandrel 1 due to the influence of the limiting structure.
[0053] In practical applications, the detachable connection between the fixing part of the limiting structure and the mandrel 1 can be realized by screw connection, threaded connection or snap connection.
[0054] It should also be noted that the sizes of the boss and the inclined surface are not limited. In order to make the inner chamfer after processing meet the design requirements, the sizes of the boss and the inclined surface can be set according to the sizes of the rubber hose and the inner chamfer to be processed.
[0055] As Figure 2 and Figure 4 shown, the two ends of the mandrel 1 are respectively the head end and the tail end. The boss near the tail end of the mandrel 1 is the lower boss 10, the inclined surface of the lower boss 10 is the lower inclined surface 100, and the limiting structure corresponding to the lower boss 10 is the lower limiting structure 3; the side surface of the lower boss 10 facing away from the lower inclined surface 100 is the abutting surface 101, and the abutting surface 101 is spaced from the tail end of the mandrel 1; as Figure 4 、 Figures 5 - 9 shown, the lower limiting structure 3 includes an inner tube body 30 and an outer tube body 31. The inner tube body 30 is the fixing part of the lower limiting structure 3. The inner tube body 30 is sleeved on the rod body between the tail end of the mandrel 1 and the abutting surface 101, and the end surface of the inner tube body 30 away from the tail end of the mandrel 1 abuts against the abutting surface 101; the outer tube body 31 is sleeved outside the inner tube body 30, and the end surface of the outer tube body 31 away from the tail end of the mandrel 1 is located on the side of the lower inclined surface 100 away from the tail end of the mandrel 1. The tube body between the end of the outer tube body 31 away from the tail end of the mandrel 1 and the position corresponding to the abutting surface 101 is the limiting part of the lower limiting structure 3.
[0056] The outer tube body 31 in the lower limiting structure 3 is used to form the limiting part, so as to form a limiting groove 2 that can accommodate the end of the rubber hose; the inner tube body 30 is used to be sleeved and fixed between the outer tube body 31 and the mandrel 1, so as to ensure the position stability of the outer tube body 31.
[0057] Among them, the outer tube body 31 can be fixed to the mandrel 1 by welding or the like, and the inner tube body 30 can be connected to the outer tube body 31 by connecting pieces such as screws and pins.
[0058] As Figure 4 shown, when the abutting surface 101 is spaced from the tail end of the mandrel 1, a stepped portion can be formed between the boss and the rod body of the mandrel 1 near its tail end. This stepped portion can limit the inner tube body 30 in the lower limiting structure 3, ensuring the position stability of the inner tube body 30.
[0059] In addition, when the outer diameter of the inner tube body 30 is greater than the maximum diameter of the boss, the end face of the inner tube body 30 far from the tail end of the mandrel 1 can also be located outside the edge of the boss. At this time, the inner wall of the limiting portion on the outer tube body 31, the end face of the inner tube body 30 far from the tail end of the mandrel 1, the lower inclined surface 100, and the outer wall of the mandrel 1 together form a limiting groove 2 at the lower limiting structure 3. After one end of the rubber tube extends into the limiting groove 2, the end face of the inner tube body 30 far from the tail end of the mandrel 1 can be attached to the end face of the rubber tube end, thereby providing a more open and stable accommodation space for the rubber tube end and preventing the inner chamfer of the rubber tube from having an overly large opening 410 due to excessive extrusion.
[0060] Furthermore, as Figure 6 shown, the outer tube body 31 and the inner tube body 30 are slidably connected along the axial direction of the mandrel 1.
[0061] When the outer tube body 31 and the inner tube body 30 are slidably connected along the axial direction of the mandrel 1, during the process of sleeving the rubber tube on the mandrel 1, the outer tube body 31 can slide along the direction away from the boss on the inner tube body 30, thereby avoiding the limiting portion on the outer tube body 31 from affecting the sleeving process of the rubber tube. After the rubber tube is sleeved in place, slide the outer tube body 31 reversely on the inner tube body 30, so that the limiting portion of the outer tube body 31 fits outside the tube body of the rubber tube near its end. This can not only make the limiting portion of the outer tube body 31 form a limiting groove 2 with the lower inclined surface 100 and the mandrel 1, but also make the portion of the rubber tube near its end located in the limiting groove 2.
[0062] It can be seen that the slidable connection of the outer tube body 31 and the inner tube body 30 along the axial direction of the mandrel 1 can effectively improve the use flexibility and convenience of the rubber tube inner chamfer forming tooling.
[0063] As Figure 4 , Figure 7 and Figure 9 shown, the inner tube body 30 is provided with an inner limiting hole 300 extending radially along it, and the outer tube body 31 is provided with an outer limiting hole 310 extending radially along it. The inner limiting hole 300 and the outer limiting hole 310 are used to communicate when the end face of the outer tube body 31 sliding away from the tail end of the mandrel 1 is located on the side of the lower inclined surface 100 far from the tail end of the mandrel 1, and a limiting rod is inserted through the communicated inner limiting hole 300 and outer limiting hole 310.
[0064] A limiting rod is inserted through the inner limiting hole 300 and the outer limiting hole 310, which can limit the relative sliding between the outer tube body 31 and the inner tube body 30, thereby effectively ensuring the position stability of the limiting groove 2 of the lower limiting structure 3, so that the lower limiting structure 3 can play its role in limiting the end of the rubber tube.
[0065] As Figure 9 shown, a sliding groove 301 extending along its axial direction is provided on the outer wall of the inner tube body 30. As Figure 6 and Figure 7 shown, a sliding protrusion 311 extending along its axial direction is provided on the inner wall of the outer tube body 31, and the sliding protrusion 311 is arranged in the sliding groove 301.
[0066] The sliding groove 301 and the sliding protrusion 311 can cooperate with each other to guide the relative sliding between the inner tube body 30 and the outer tube body 31, thereby improving the stability of the relative sliding process between the inner tube body 30 and the outer tube body 31.
[0067] As Figure 8 shown, a dial 312 is provided on the outer wall of the outer tube body 31.
[0068] The dial 312 can act as a handle, which is convenient for the staff to drive the outer tube body 31 to slide on the inner tube body 30, thereby effectively improving the use convenience of the rubber tube inner chamfer forming tooling.
[0069] As Figure 2 and Figure 3 shown, the boss near the first end of the mandrel 1 is the upper boss 11, the inclined surface of the upper boss 11 is the upper inclined surface 110, and the limiting structure corresponding to the upper boss 11 is the upper limiting structure 4; as Figure 3 、 Figure 10 and Figure 11 shown, the upper limiting structure 4 includes an upper tube body 40, the upper tube body 40 can pass through the first end of the mandrel 1 and then be sleeved outside the mandrel 1, and the end surface of the upper tube body 40 far from the first end of the mandrel 1 can extend to the side of the upper inclined surface 110 far from the first end of the mandrel 1; the tube body of the upper tube body 40 between the first end of the mandrel 1 and the upper boss 11 is the fixed part of the upper limiting structure 4, and the rest of the tube body is the limiting part of the upper limiting structure 4.
[0070] In this embodiment, the upper tube body 40 is detachably connected to the mandrel 1, and the upper tube body 40 is separated from the mandrel 1 before the rubber tube is sleeved outside the mandrel 1. After the rubber tube is sleeved outside the mandrel 1 and the end of the rubber tube near the tail end of the mandrel 1 extends into the limiting groove 2 of the lower limiting structure 3, the upper tube body 40 is passed through the first end of the mandrel 1 and then sleeved outside the mandrel 1, and the end surface of the upper tube body 40 far from the first end of the mandrel 1 extends to the side of the upper inclined surface 110 far from the first end of the mandrel 1 to form the limiting part of the upper limiting structure 4.
[0071] It should be noted that after the upper tube body 40 is sleeved on the mandrel 1, in order to ensure the stability of the limiting groove 2 formed between the limiting part on the upper tube body 40, the upper inclined surface 110 and the mandrel 1, radial insertion holes can be opened on the upper tube body 40, and radial slots can be opened at corresponding positions on the mandrel 1. The radial insertion holes and the radial slots are used to communicate when the limiting groove 2 is formed between the limiting part on the upper tube body 40, the upper inclined surface 110 and the mandrel 1, and a limiting pin is inserted into the communicated radial insertion holes and radial slots.
[0072] Alternatively, in order to ensure the stability of the limiting groove 2 formed between the limiting part on the upper tube body 40, the upper inclined surface 110 and the mandrel 1, as Figure 12 shown, a limiting piece 5 is provided at the head end of the mandrel 1, and an annular groove 50 extending along the circumferential direction of the mandrel 1 is provided at the connection between the limiting piece 5 and the head end of the mandrel 1; as Figure 3 、 Figure 10 and Figure 11 shown, the end of the upper tube body 40 close to the head end of the mandrel 1 is a fixed end, and a retaining piece 41 is provided at the inner edge on one side of the fixed end, and an opening 410 for the limiting piece 5 to pass through is left between the inner edge on the other side and the retaining piece 41; the retaining piece 41 is used to be located at the annular groove 50 after the upper tube body 40 is sleeved on the mandrel 1, and to abut against the limiting piece 5 along the axial direction of the upper tube body 40 after the upper tube body 40 rotates relative to the mandrel 1.
[0073] Before sleeving the upper tube body 40 on the mandrel 1, the opening 410 left at the retaining piece 41 of the upper tube body 40 can be made opposite to the limiting piece 5 to ensure that the limiting piece 5 can pass through the opening 410; then the upper tube body 40 is sleeved on the mandrel 1, and the retaining piece 41 is made to enter the annular groove 50 on the mandrel 1, and then the upper tube body 40 is rotated so that the opening 410 on the upper tube body 40 and the limiting piece 5 are staggered in position. At this time, the limiting piece 5 and the retaining piece 41 will abut against each other along the axial direction of the mandrel 1, and the inner wall of the annular groove 50 and the retaining piece 41 will also abut against each other along the axial direction of the mandrel 1. Under the double restrictions of the limiting piece 5 and the annular groove 50, the position stability of the upper tube body 40 on the mandrel 1 can be ensured, and the upper tube body 40 can be effectively restricted from coming off the mandrel 1, and the stability of the limiting groove 2 in the upper limiting structure 4 can also be ensured.
[0074] It should be noted that, as Figure 3 shown, an annular recess can be provided between the end of the upper tube body 40 far from the head end of the mandrel 1 and the inner wall. The recess is used to make the inner wall of the upper tube body 40 form a stepped surface, and the stepped surface can abut against the end face of the end of the rubber tube close to the upper boss 11, so as to ensure the stability of the rubber tube.
[0075] In addition, when the upper tube body 40 is provided with the above-mentioned annular recessed portion, the limiting portion on the upper tube body 40, the stepped surface formed at the recessed portion, the upper inclined surface 110 and the outer wall of the mandrel 1 together form the limiting groove 2 at the upper limiting structure 4. After the end portion of the rubber tube near the first end of the mandrel 1 extends into the limiting groove 2, it can also provide a more open and stable accommodation space for the end portion of the rubber tube, preventing the inner chamfer with an overly large opening 410 from being formed due to excessive extrusion of the rubber tube.
[0076] As Figure 3 and Figure 4 shown, an arc chamfer 6 is provided between one side of the limiting portion close to the middle of the mandrel 1 and its inner wall.
[0077] The arc chamfer 6 can play a guiding role during the process of the end portion of the rubber tube extending into the limiting groove 2, and provide a more open entry space for the end portion of the rubber tube, thereby effectively improving the convenience of the process of the rubber tube entering the limiting groove 2.
[0078] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.
Claims
1. A hose internal chamfering forming tool, characterized in that: It comprises a core rod (1) and a limiting structure; The mandrel (1) is provided with an annular boss extending along its circumferential direction at a position at least close to one end thereof, and the side surface of the boss close to the middle of the mandrel (1) is an inclined surface, and the inclined surface is inclined from the side located at the inner edge of the ring of the boss to the side located at the outer edge of the ring, in a direction away from the middle of the mandrel (1); The limiting structure comprises a fixing portion and an annular limiting portion, wherein the fixing portion is fixed on the mandrel (1) and is located on a side of the inclined surface away from the middle of the mandrel (1), and the limiting portion is arranged around the circumference of the inclined surface, and an annular limiting groove (2) is formed between the inner wall of the limiting portion, the inclined surface and the outer wall of the mandrel (1); The core rod (1) is used to be inserted into a rubber hose to be processed, the limiting groove (2) is used to accommodate the end of the rubber hose, and the inclined surface is used to abut against the inner wall of the rubber hose near its end.
2. The hose inner chamfer forming tool according to claim 1, characterized in that: The mandrel (1) is provided with bosses at positions close to one end thereof and at positions close to the other end thereof, respectively, and there are two limiting structures, and the two limiting structures are provided correspondingly to the two bosses; At least one fixing portion of the limiting structure is detachably connected to the core rod (1).
3. The hose inner chamfer forming tool according to claim 2, characterized in that: The two ends of the mandrel (1) are respectively a head end and a tail end, the boss close to the tail end of the mandrel (1) is a lower boss (10), the inclined surface of the lower boss (10) is a lower inclined surface (100), and the limiting structure arranged corresponding to the lower boss (10) is a lower limiting structure (3); The side surface of the lower boss (10) facing away from the lower inclined surface (100) is a contact surface (101), and the contact surface (101) is spaced apart from the rear end of the mandrel (1); The lower limiting structure (3) comprises an inner tube body (30) and an outer tube body (31), the inner tube body (30) being a fixed part of the lower limiting structure (3), the inner tube body (30) being sleeved on the rod body between the tail end of the mandrel (1) and the abutment surface (101), and the end surface of the inner tube body (30) away from the tail end of the mandrel (1) abuts against the abutment surface (101); The outer tube body (31) is sleeved outside the inner tube body (30), and the end face of the outer tube body (31) away from the tail end of the core rod (1) is located on the side of the lower inclined surface (100) away from the tail end of the core rod (1), and the tube body between the end of the outer tube body (31) away from the tail end of the core rod (1) and the position corresponding to the abutment surface (101) is the limiting part of the lower limiting structure (3).
4. The hose inner chamfer forming tool according to claim 3, characterized in that: The outer tube body (31) is slidably connected to the inner tube body (30) along the axial direction of the core rod (1).
5. The hose inner chamfer forming tool according to claim 4, characterized in that: The inner tube body (30) is provided with an inner limit hole (300) extending along its radial direction, and the outer tube body (31) is provided with an outer limit hole (310) extending along its radial direction. The inner limit hole (300) and the outer limit hole (310) are used to be connected when the outer tube body (31) slides to the side of the lower inclined surface (100) away from the tail end of the core rod (1) and the end face thereof is located away from the tail end of the core rod (1), and a limit rod is passed through the connected inner limit hole (300) and the outer limit hole (310).
6. The hose inner chamfer forming tool according to claim 4, characterized in that: The outer wall of the inner tube body (30) is provided with a slide groove (301) extending along its axial direction, and the inner wall of the outer tube body (31) is provided with a sliding protrusion (311) extending along its axial direction, and the sliding protrusion (311) is arranged in the slide groove (301).
7. The hose inner chamfer forming tool according to claim 4, characterized in that: The outer wall of the outer tube body (31) is provided with a paddle (312).
8. The hose inner chamfer forming tool according to any one of claims 3 to 7, characterized in that: The boss close to the head end of the core rod (1) is an upper boss (11), the inclined surface of the upper boss (11) is an upper inclined surface (110), and the limiting structure arranged corresponding to the upper boss (11) is an upper limit structure (4); The upper limit structure (4) comprises an upper tube body (40), the upper tube body (40) being capable of passing through the head end of the mandrel (1) and being sleeved outside the mandrel (1), and the end surface of the upper tube body (40) away from the head end of the mandrel (1) being capable of extending to a side of the upper inclined surface (110) away from the head end of the mandrel (1); The tube body of the upper tube body (40) located between the head end of the core rod (1) and the upper boss (11) is the fixing part of the upper limit structure (4), and the rest of the tube body is the limiting part of the upper limit structure (4).
9. The hose inner chamfer forming tool according to claim 8, characterized in that: A limiting plate (5) is provided at the head end of the mandrel (1), and an annular groove (50) extending along the circumference of the mandrel (1) is provided at the connection between the limiting plate (5) and the head end of the mandrel (1); The end of the upper tube (40) close to the head end of the mandrel (1) is a fixed end, a baffle (41) is provided at the inner edge of one side of the fixed end, and an opening (410) for the limit plate (5) to pass through is reserved between the inner edge of the other side and the baffle (41); The blocking piece (41) is used to be located at the annular groove (50) after the upper tube body (40) is sleeved outside the core rod (1), and to abut against the limiting piece (5) along the axial direction of the upper tube body (40) after the upper tube body (40) rotates relative to the core rod (1).
10. The hose inner chamfer forming tool according to any one of claims 1 to 7, characterized in that: An arc chamfer (6) is provided between one side of the limiting portion close to the middle of the core rod (1) and the inner wall thereof.