A self-rebound universal mandrel

Abstract

This invention relates to a self-rebound universal mandrel, comprising a mandrel body and a plurality of universal ball mandrel heads connected to the mandrel body. One end of the mandrel body is provided with a ball socket that mates with the universal ball. The plurality of universal ball mandrel heads are sequentially connected end-to-end via the ball socket structure, with a pre-reserved turning clearance between adjacent universal ball mandrel heads. The sidewall of each universal ball mandrel head is a deformation-resistant contact surface that mates with the inner wall of a bent pipe. Springback components are provided between adjacent universal ball mandrel heads and between the universal ball mandrel heads and the mandrel body. The springback components ensure that the mandrel naturally maintains a taut state without external interference.

Description

Technical Field

[0001] This invention relates to a self-rebound universal mandrel. Background Technology

[0002] Currently, during pipe bending, a support mandrel is inserted into the pipe to prevent flattening and distortion. This mandrel supports the inner wall of the pipe, effectively reducing interface collapse and distortion during bending. However, some mandrels are currently connected via a universal ball joint (e.g., the technical solution disclosed in patent number CN200810079974.8). In its natural state, the mandrel is irregularly bent. When inserting the universal mandrel into the pipe, the operator needs to straighten it first, which is inconvenient. Especially in the context of modern intelligent workshops, where pipe and mandrel connections are completed by robotic arms, it is necessary to ensure that the mandrel is ideally in a straight state in its natural state to facilitate the robotic arm's connection and improve production efficiency. There is an urgent need for a self-rebound universal mandrel that remains taut without external force. Summary of the Invention

[0003] The purpose of this invention is to overcome the defects in the prior art and provide a self-rebound universal mandrel that is taut in the absence of external force.

[0004] To achieve the above objectives, the technical solution of the present invention is to provide a self-rebound universal mandrel, including a mandrel body and a plurality of universal ball mandrel heads connected to the mandrel body. One end of the mandrel body is provided with a ball socket that mates with the universal ball. The plurality of universal ball mandrel heads are connected end to end in sequence through the ball socket structure. A turning clearance is reserved between adjacent universal ball mandrel heads. The sidewall of each universal ball mandrel head is a deformation-resistant contact surface that mates with the inner wall of the curved tube.

[0005] A spring-loaded component is provided between adjacent universal ball joint heads and between the universal ball joint head and the mandrel body.

[0006] By incorporating a spring-loaded component, the mandrel can be guaranteed to remain taut naturally without external interference.

[0007] Preferably, the spring-loaded component is annular and fills between the universal ball core heads or between the universal ball core head and the mandrel body.

[0008] This design optimizes the rebound mechanism.

[0009] Preferably, when the universal mandrel is in a straight state, the spring-loaded component is in an undeformed state or a compressed state.

[0010] This design ensures that the spring-loaded component will deform under stress when the mandrel is bent, thereby driving the mandrel to straighten.

[0011] Preferably, the rebound component is an elastic rubber ring or a spring component.

[0012] This design enriches the structure of elastic components.

[0013] Preferably, the rebound component is an elastic rubber ring, and the material of the rubber ring is polyurethane.

[0014] This design ensures the rebound force and service life of the rebound components.

[0015] Preferably, the spring-loaded component is hollow or solid.

[0016] This design enriches the structure of elastic components.

[0017] Preferably, the spring component includes a plurality of cylindrical springs arranged in a ring, and the plurality of cylindrical springs are connected and limited by a connecting bracket.

[0018] This design enriches the structure of elastic components.

[0019] Preferably, the inner wall of the universal ball head and / or the mandrel body is provided with a limiting groove to accommodate the elastic rubber ring.

[0020] This design makes the connection of the elastic rubber rings more stable.

[0021] Preferably, the surface of the elastic rubber ring that mates with the universal ball head or the mandrel body is provided with a raised inclined surface; one end of the raised inclined surface is the starting end, which is flush with the surface of the elastic rubber ring, and the other end is the raised end, which is higher than the surface of the elastic rubber ring. There is a gradually transitioning height difference between the starting end and the raised end of the raised inclined surface, and the raised inclined surface is coaxially arranged with the elastic rubber ring.

[0022] This design allows the elastic rubber ring to rotate around the axis. When the elastic rubber ring is squeezed, different positions can be squeezed, avoiding fatigue caused by repeated local compression, which can reduce the elasticity or even cause failure. This helps to improve the service life and stability of the entire mandrel.

[0023] Preferably, multiple sets of raised inclined surfaces are arranged around the elastic rubber ring, and the inclination angle of the raised inclined surfaces is 0.1 to 1 degree.

[0024] This design allows for small-angle rotation while ensuring rebound force.

[0025] The advantages and beneficial effects of this invention are as follows: through this design and the setting of the spring-loaded component, the core rod can be naturally kept in a taut state without external interference, which is convenient for the robotic arm to grasp and attach. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the universal mandrel structure of the present invention;

[0027] Figure 2 This is a cross-sectional schematic diagram of the universal mandrel structure of the present invention;

[0028] Figure 3 This is a schematic diagram of the universal mandrel explosion structure of the present invention;

[0029] Figure 4 This is a schematic diagram of the springback component structure in Embodiment 1 of the present invention;

[0030] Figure 5 This is a schematic diagram of the spring-loaded component structure in Embodiment 3 of the present invention (with a raised inclined surface).

[0031] Figure 6 This is a schematic diagram of the spring-loaded component structure (multiple cylindrical springs) in Embodiment 2 of the present invention.

[0032] Figure 7 This is a schematic diagram of the spring-loaded component structure in Embodiment 2 of the present invention (multiple cylindrical springs, side view).

[0033] Figure 8 for Figure 7 Enlarged schematic diagram of the structure at point A in the middle.

[0034] In the diagram: 1. Core rod body; 2. Universal ball core head; 3. Ball socket; 4. Turning clearance; 5. Anti-deformation contact surface; 6. Springback component; 7. Limiting groove; 8. Protruding inclined surface; 9. Starting end; 10. Protruding end; 11. Cylindrical spring; 12. Connecting bracket. Detailed Implementation

[0035] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0036] like Figures 1 to 8 As shown in Embodiment 1, a self-rebound universal mandrel includes a mandrel body 1 and a plurality of universal ball mandrel heads 2 connected to the mandrel body 1. One end of the mandrel body 1 is provided with a ball socket 3 that mates with the universal ball. The plurality of universal ball mandrel heads 2 are connected end to end in sequence through the ball socket 3 structure. A turning gap 4 is reserved between adjacent universal ball mandrel heads 2. The sidewall of each universal ball mandrel head 2 is a deformation-resistant contact surface 5 that mates with the inner wall of the curved pipe.

[0037] A spring-loaded component 6 is provided between adjacent universal ball cores 2 and between the universal ball core 2 and the mandrel body 1.

[0038] The spring-loaded component 6 is annular and fills between the universal ball cores 2 or between the universal ball cores 2 and the mandrel body 1.

[0039] When the universal mandrel is in a straight state, the spring-loaded component 6 is in an undeformed state or a compressed state.

[0040] The rebound component 6 is an elastic rubber ring or a spring component.

[0041] The rebound component 6 is an elastic rubber ring, and the material of the rubber ring is polyurethane.

[0042] The spring-back component 6 can be hollow or solid.

[0043] The inner wall of the universal ball head 2 and / or the core rod body 1 is provided with a limiting groove 7 to accommodate the elastic rubber ring.

[0044] During use, the tube is fitted over the mandrel. When the tube bends, the mandrel bends in the same direction as the tube due to the pressure from the tube. However, the support on the outside of the universal ball mandrel 2 supports the inside of the tube, preventing deformation. For example, two adjacent universal ball mandrels 2 may initially be aligned in a straight line, but after being compressed, one side will move closer together, and the elastic rubber ring between the two adjacent universal ball mandrels 2 will also be compressed and deformed. After the entire bending process is completed, the mandrel is pulled out of the tube, and the elastic rubber ring will spring back, pushing the two adjacent universal ball mandrels 2 back to their original initial state. After all the universal ball mandrels 2 parts have been processed in this way, the mandrel pulled out of the tube will naturally straighten, facilitating subsequent gripping and tube fitting. This improves production efficiency.

[0045] Example 2, a further optimization of Example 1, is a self-rebound universal mandrel, characterized in that: the surface of the elastic rubber ring that mates with the universal ball head 2 or the mandrel body 1 is provided with a raised inclined surface 8; one end of the raised inclined surface 8 is a starting end 9, which is flush with the surface of the elastic rubber ring, and the other end is a raised end 10, which is higher than the surface of the elastic rubber ring; there is a gradually transitioning height difference between the starting end 9 and the raised end 10; the raised inclined surface 8 is coaxially arranged with the elastic rubber ring.

[0046] The raised inclined surface 8 is arranged in multiple sets around the elastic rubber ring, and the inclination angle of the raised inclined surface 8 is 0.1 to 1 degree.

[0047] Since the bending of the tube body is part of batch production, bending operations at the same location during the production of the same batch of products will compress the universal ball head 2 and the elastic rubber ring at the same location on the mandrel. The location and angle of compression are the same and similar, which will cause local fatigue damage to the elastic rubber ring. To avoid this situation, the raised inclined surface 8 is designed so that the elastic rubber ring rotates around the axis while being compressed. This will avoid local fatigue damage to the same elastic rubber ring, improve the service life and rebound stability of the rubber ring, and thus improve the service life and rebound stability of the entire mandrel.

[0048] Since the protruding end 10 of the protruding inclined surface 8 is higher than the surface of the elastic rubber ring, a portion of the volume of the elastic material filling will be lost in terms of the overall elasticity of the elastic rubber ring. Therefore, in order to ensure the filling amount of the elastic rubber ring and also meet the rotation requirements, only a small angle of inclination can be selected.

[0049] The starting end 9 and the protruding end 10 are arranged alternately around the elastic rubber ring. This arrangement makes the elastic rubber ring base plate rotate in one direction (clockwise or counterclockwise), and the probability of each area of ​​the same elastic rubber ring being squeezed tends to be consistent.

[0050] In embodiment 3, the spring component includes a plurality of cylindrical springs 11, which are arranged in a ring around each other and are connected by a connecting bracket 12.

[0051] Another method is to use a cylindrical spring 11 to spring back. For example, two adjacent universal ball joint heads 2 are initially aligned in a straight line, but after being compressed, one side will move closer together. The cylindrical spring 11 between the two adjacent universal ball joint heads 2 will also be compressed and deformed. After the entire bending process is completed, the mandrel is pulled out of the tube, and the cylindrical spring 11 will spring back, pushing the two adjacent universal ball joint heads 2 back to their original initial state. This structure is slightly more complex than the structures in embodiments 1 and 2, but its service life is longer.

[0052] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the invention.

Claims

1. A self-rebound universal mandrel, characterized by: Including the core rod body (1) and the several universal ball core head (2) that connects with the core rod body (1), the core rod body (1) one end is provided with the ball socket (3) that cooperates with the universal ball and connects;The several universal ball core head (2) is connected in proper order through the ball socket (3) structure first and last, the universal ball core head (2) between adjacent the steering gap (4) is reserved, every universal ball core head (2) side wall is the deformation prevention contact surface (5) that cooperates with the contact of elbow pipe inner wall; The elastic rubber ring is arranged between the adjacent universal ball core head (2) and between the universal ball core head (2) and the core rod body (1). The limiting groove (7) for accommodating the elastic rubber ring is formed on the inner wall of the universal ball core head (2) and the core rod body (1). The surface of the elastic rubber ring matched with the universal ball core head (2) or the core rod body (1) is provided with the raised inclined surface (8), one end of the raised inclined surface (8) is the starting end (9) flush with the surface of the elastic rubber ring, the other end is the raised end (10) higher than the surface of the elastic rubber ring, the starting end (9) and the raised end (10) have the raised inclined surface (8) with gradually transition height difference between them. The raised inclined surface (8) is provided with multiple groups around the elastic rubber ring, the starting end (9) and the raised end (10) are arranged alternately around the elastic rubber ring, the raised inclined surface (8) is coaxially arranged with the elastic rubber ring, and the inclination angle of the raised inclined surface (8) is 0.1 to 1 degrees.

2. The self-rebound gimbal mandrel of claim 1, wherein: When the universal core rod is in a straight line state, the elastic rubber ring is in an undeformed state or a compressed state.

3. The self-rebound gimbal mandrel of claim 1, wherein: The material of the elastic rubber ring is polyurethane.

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