Rubber tube with different tube diameters and different wall thicknesses at two ends and preparation method

Abstract

The invention relates to a rubber tube with different tube diameters and different wall thicknesses at two ends and a preparation method, the rubber tube comprises a rubber tube body, the rubber tube body is of a multi-layer structure, the inner layer of the multi-layer structure is a rubber layer, the middle layer of the multi-layer structure is a structure reinforcing layer, and the outer layer of the multi-layer structure is a rubber layer and is formed through low-pressure extrusion; the rubber tube body is divided into a first end part and a second end part, the first end part is subjected to low-pressure extrusion molding, the second end part of the rubber tube is subjected to low-pressure extrusion molding and then is subjected to diameter change, and the wall thickness of the structure after the diameter change of the second end part is greater than the wall thickness of the first end part. As the wall thickness of the reducing structure of the second end part is larger than that of the first end part, the first end part is conventionally used, and the reducing structure of the wall thickness of the second end part ensures that the structural strength, the gas hydraulic strength and the assembly meet the requirements of self-locking clamp matching design specifications; meanwhile, the rubber pipe with different pipe diameters and different wall thicknesses at the two ends is of an integrated structure, and the real-time dynamic working state is met after the rubber pipe is connected.

Description

Technical Field

[0001] The invention relates to the technical field of rubber hose preparation, in particular to a rubber hose with different diameters and wall thicknesses at two ends and a preparation method thereof. Background Art

[0002] At present, the preparation of hoses can be roughly divided into two types. One is to use EPDM or NBR+PVC medium and low pressure extruded hoses. Due to the extrusion process, the wall thickness at both ends of the hose is consistent. This method can be mass-produced. The disadvantage is that hoses of different diameters cannot be produced, especially the wall thickness of the large end of the variable diameter is greater than the wall thickness of the small end, that is, it cannot meet the design specification requirements of the self-locking clamp matching.

[0003] The second method uses a molding process, which requires a special mold and vulcanizes the cloth layer or wire layer and the rubber body. Although it can meet the requirements of variable diameter and larger end wall thickness than the smaller end wall thickness, it has extremely low efficiency and high cost and cannot meet the requirements of large-scale production.

[0004] The Chinese invention patent authorization announcement number is: CN103016863B. The pipeline connection structure and hydraulic pipeline are connected to corresponding types of steel pipes through different types of matching sleeves, which expands the types of steel pipes that can be connected to the joint core and is suitable for the connection between the steel pipe and the joint core.

[0005] The Chinese utility model patent authorization announcement number is: CN208703360 U. An adjustable plastic pipe can solve the problem of difficult connection between pipes of different diameters, and can solve the problem of easy leakage of the connecting head after the pipes are connected. After the buried plastic pipe leaks, the position of the connecting head can be easily found.

[0006] The multiple joints in the patent document are not suitable for integrated structures, especially for automotive parts, because the working state of the automotive parts after the hoses are connected is a real-time dynamic relationship, which is impossible or has no reference value. Summary of the invention

[0007] In order to produce rubber hoses with different diameters, especially a rubber hose with a larger end having a thicker wall than a smaller end, the present invention provides a rubber hose with different diameters and wall thicknesses at both ends and a preparation method thereof.

[0008] To this end, the technical solution of the present invention is a hose with different diameters and wall thicknesses at both ends, including a hose body, wherein the hose body is a multi-layer structure, wherein the inner layer is a rubber layer, the middle layer is a structural reinforcement layer, and the outer layer is a rubber layer and is formed by low-pressure extrusion; the hose body is divided into a first end and a second end, wherein the first end is formed by low-pressure extrusion, and is characterized in that: the second end of the hose is formed by low-pressure extrusion and then reduced in diameter, wherein the structural wall thickness of the second end after the diameter reduction is greater than the wall thickness of the first end.

[0009] The effect is: In the present invention, since the wall thickness of the variable diameter structure at the second end is greater than that of the first end, the first end is conventionally used, and the variable diameter structure of the wall thickness of the second end ensures its structural strength, gas and hydraulic pressure, and meets the requirements of the self-locking clamp matching design specifications during assembly; at the same time, the hose with different pipe diameters and wall thicknesses at both ends is an integrated structure, and the hose meets the real-time dynamic working state after being connected.

[0010] A further improvement is that the diameter change of the second end of the hose body is an internal expansion tube type diameter change, and after the diameter change, the outer layer of the second end is vulcanized or heat-shrunk to have an outer layer structure, so that the wall thickness of the diameter change structure of the second end is greater than the wall thickness of the first end, and after vulcanization or heat shrinkage, it becomes an integrated structure.

[0011] The effect is that the internal expansion tube type diameter reduction is simple and easy to implement. After the diameter reduction, the outer layer of the second end is vulcanized or heat-shrunk to have an outer layer structure, which is equivalent to adding an additional outer layer structure. The effect of vulcanization or heat shrinkage turns it into an integrated structure, which satisfies the requirement that the wall thickness of the diameter reduction structure of the second end is greater than the wall thickness of the first end.

[0012] A further improvement is that the extension length of the outer layer structure is greater than the length of the inner expansion tube type diameter change.

[0013] The effect is: since the internal expansion tube type diameter change may cause physical damage to the diameter change location, the extension length of the outer layer structure should be greater than the length of the internal expansion tube type diameter change, so as to solve the negative pressure and pressure problems after the hose changes its diameter, and make the connection of the hose unobstructed.

[0014] A further improvement is that the hose body uses EPDM or NBR+PVC as the rubber body.

[0015] The effect is that the material of the hose body is EPDM or NBR+PVC, which is easy to take and convenient to obtain, and at the same time, the internal expansion tube type diameter reduction has little effect on it and will not affect its performance.

[0016] A further improvement is that the outer layer structure is EPDM or NBR+PVC.

[0017] The effect is that the outer layer structure is converted into an integral structure by vulcanization or heat shrinkage, so that the wall thickness of the variable diameter structure at the second end is greater than the wall thickness of the first end.

[0018] A method for preparing a hose with different diameters and wall thicknesses at both ends, comprising a hose body, wherein the hose body is a multi-layer structure, wherein the inner layer is a rubber layer, the middle layer is a structural reinforcement layer, and the outer layer is a rubber layer and is formed by low-pressure extrusion; the hose is divided into a first end and a second end, wherein the first end is formed by low-pressure extrusion, and is characterized in that the second end of the hose is formed by low-pressure extrusion and then reduced in diameter, wherein the wall thickness of the diameter-reducing structure of the second end is greater than the wall thickness of the first end; The diameter change of the second end of the hose body is an internal expansion tube type diameter change, and after the diameter change, the outer layer of the second end is vulcanized or heat-shrunk to have an outer layer structure, so that the wall thickness of the diameter change structure of the second end is greater than the wall thickness of the first end, and it becomes an integrated structure after vulcanization and heat shrinkage.

[0019] The effect is that: the present invention adopts a new process to locally thicken the second end after the diameter is reduced, which meets the design requirements, and turns it into an integrated structure after vulcanization or heat shrinkage, thereby enhancing the local performance of the hose. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is an outline diagram of the present invention.

[0021] Figure 2 yes Figure 1 sectional view of .

[0022] Figure 3 This is a schematic diagram after the mold is installed.

[0023] In the figure, 1 is the hose body, 2 is the rubber layer, 3 is the structural reinforcement layer, 4 is the first end, 5 is the second end, 6 is the outer layer structure, and 7 is the inner expansion tube type diameter reducing die. DETAILED DESCRIPTION

[0024] The present invention Figure 1 , 2 、3 as shown: A hose with different diameters and wall thicknesses at both ends, comprising a hose body 1, wherein the hose body 1 is a multi-layer structure, wherein the inner layer is a rubber layer 2, the middle layer is a structural reinforcement layer 3, and the outer layer is a rubber layer and is formed by low-pressure extrusion; the hose body 1 is divided into a first end 4 and a second end 5, wherein the first end 4 is formed by low-pressure extrusion, and the second end 5 of the hose body is formed by low-pressure extrusion and then reduced in diameter, wherein the structural wall thickness of the second end 5 after diameter reduction is greater than the wall thickness of the first end 4.

[0025] The second end portion 5 of the hose body is reduced in diameter by using an internal expansion tube type diameter reduction die 7 to expand and reduce the diameter.

[0026] The diameter reduction of the second end 5 of the hose body 1 is an internal expansion tube type diameter reduction, and after the diameter reduction, the outer layer of the second end 5 is vulcanized or heat-shrunk to have an outer layer structure 6, so that the wall thickness of the diameter reduction structure of the second end 5 is greater than the wall thickness of the first end 3, and it becomes an integrated structure after vulcanization or heat shrinkage.

[0027] The extension length of the outer layer structure 6 is greater than the length of the inner expansion tube type diameter change.

[0028] The hose body 1 uses EPDM or NBR+PVC as the rubber body 2.

[0029] The outer layer structure 6 is EPDM or NBR+PVC.

[0030] In the specific use process, the outer layer structure 6 is EPDM or NBR+PVC which is low-pressure extruded and then put on the outside of the hose body 1 through vulcanization to make it one body, and then the internal expansion tube type diameter reduction is used. At this time, the wall thickness of the structure after the diameter reduction of the second end 5 is greater than the wall thickness of the first end 4.

[0031] The second method is a heat shrink method, in which the second end 5 of the hose body 1 is reduced in diameter and then covered with a heat shrink tube, so that the wall thickness of the structure of the second end 5 after the reduction in diameter is greater than the wall thickness of the first end 4. At this time, the heat shrink tube is solidified outside the second end 5 to form an outer layer structure 6.

[0032] A method for preparing a hose with different diameters and wall thicknesses at both ends, comprising a hose body 1, wherein the hose body 1 is a multi-layer structure, wherein the inner layer is a rubber layer 2, the middle layer is a structural reinforcement layer 3, and the outer layer is a rubber layer 2 and is formed by low-pressure extrusion; the hose is divided into a first end 4 and a second end 5, wherein the first end 4 is formed by low-pressure extrusion, and the second end 5 of the hose body 1 is formed by low-pressure extrusion and then reduced in diameter, wherein the wall thickness of the reduced-diameter structure of the second end 5 is greater than the wall thickness of the first end 4; The diameter reduction of the second end 5 of the hose body 1 is an internal expansion tube type diameter reduction, and after the diameter reduction, the outer layer of the second end 5 is vulcanized or heat-shrunk to have an outer layer structure 6, so that the wall thickness of the diameter reduction structure of the second end 5 is greater than the wall thickness of the first end 4, and it becomes an integrated structure after vulcanization or heat shrinkage.

Claims

1. A hose with different diameters and wall thicknesses at both ends, comprising a hose body (1), wherein the hose body (1) is a multi-layer structure, wherein the inner layer is a rubber layer (2), the middle layer is a structural reinforcement layer (3), and the outer layer is a rubber layer (2) and is formed by low-pressure extrusion; the hose is divided into a first end (4) and a second end (5), wherein the first end (4) is formed by low-pressure extrusion, and is characterized in that: The second end portion (5) of the hose body (1) is formed by low-pressure extrusion and then reduced in diameter, wherein the wall thickness of the second end portion (5) after the diameter reduction is greater than the wall thickness of the first end portion (4).

2. A hose with different diameters and wall thicknesses at both ends according to claim 1, characterized in that: The diameter reduction of the second end portion (5) of the hose body (1) is an internal expansion tube type diameter reduction, and after the diameter reduction, the outer layer of the second end portion (5) is vulcanized or heat-shrunk to form an outer layer structure (6), so that the wall thickness of the diameter reduction structure of the second end portion (5) is greater than the wall thickness of the first end portion (4), and after vulcanization or heat shrinkage, it becomes an integrated structure.

3. A hose with different diameters and wall thicknesses at both ends according to claim 2, characterized in that: The extension length of the outer layer structure (6) is greater than the length of the inner expansion tube type variable diameter.

4. The hose with different diameters and wall thicknesses at both ends according to claim 1, characterized in that: The hose body (1) uses EPDM or NBR+PVC as the rubber body; the outer layer structure (6) is EPDM or NBR+PVC.

5. The rubber hose with different diameters and wall thicknesses at both ends according to claim 2, characterized in that: The outer layer structure (6) is EPDM or NBR+PVC, which is extruded at low pressure, and then mounted on the outside of the hose body (1) and vulcanized to form a whole. Then, an internal expansion tube type diameter reduction is used. At this time, the wall thickness of the structure after diameter reduction at the second end (5) is greater than the wall thickness of the first end (4).

6. The rubber hose with different diameters and wall thicknesses at both ends according to claim 2, characterized in that: The heat shrinking method is to reduce the diameter of the second end portion (5) of the hose body (1) and then cover the heat shrink tube with it, so that the wall thickness of the structure of the second end portion (5) after the diameter reduction is greater than the wall thickness of the first end portion (4), and at this time, the heat shrink tube is solidified outside the second end portion (5) to form an outer layer structure (6).

7. A method for preparing a hose with different diameters and wall thicknesses at both ends, comprising a hose body (1), wherein the hose body (1) is a multi-layer structure, wherein the inner layer is a rubber layer (2), the middle layer is a structural reinforcement layer (3), and the outer layer is a rubber layer (3) and is formed by low-pressure extrusion; the hose body (1) is divided into a first end portion (4) and a second end portion (5), wherein the first end portion (3) is formed by low-pressure extrusion, and characterized in that: The second end portion (5) of the hose body (1) is formed by low-pressure extrusion and then reduced in diameter, wherein the wall thickness of the diameter-reducing structure of the second end portion (5) is greater than the wall thickness of the first end portion; The diameter reduction of the second end portion (5) of the hose body (1) is an internal expansion tube type diameter reduction, and after the diameter reduction, the outer layer of the second end portion (5) is vulcanized and heat-shrunk to form an outer layer structure (6), so that the wall thickness of the diameter reduction structure of the second end portion (6) is greater than the wall thickness of the first end portion (4), and after vulcanization and heat shrinkage, it becomes an integrated structure.

8. A method for preparing a hose with different diameters and wall thicknesses at both ends according to claim 7, wherein the hose body (1) uses EPDM or NBR+PVC as the rubber body; and the outer layer structure (6) is EPDM or NBR+PVC.

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