Abrasion Resistant Hose

Abstract

To provide a wear resistance hose improved so as to display that inner pressure increases to a predetermined value or more for realizing a tip end hose that can efficiently carry out ready-mixed concrete placing work without problems.SOLUTION: A wear resistance hose A is equipped with a hose body 1 made of a flexible material, and a cylindrical connection mouthpiece 2 fitted and integrated with a base end portion of the hose body 1, and is provided with a display mechanism B capable of displaying dimensional changes of the hose body 1. The display mechanism B is configured to display the extension amount due to pressurization of the hose body 1 of a ready-mixed concrete placing tip end hose.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to an abrasion-resistant hose, such as a tip hose for pouring fresh concrete, that has a hose body made of a flexible material and a tubular connection fitting that is fitted integrally to the base end of the hose body. [Background technology]

[0002] Concrete pump trucks are generally used for pouring ready mixed concrete at construction sites. The ready mixed concrete is pumped using a concrete pump truck with a piping line, and is discharged and supplied to a specified injection point from a tip hose for pouring ready mixed concrete, which is located at the end of the piping line. A known example of such work using a tip hose made of an abrasion resistant hose is disclosed in Patent Document 1.

[0003] Fresh concrete and its ingredients (sand, aggregate, etc.) can adhere to the inside of the piping line, causing the hose tip to become clogged or even blocked. For example, fresh concrete with a high sand content that is first discharged from a mixer truck can adhere to the dry inner surface of the hose and harden, causing clogging or blockage.

[0004] It is necessary to interrupt the pouring work and remove the tip hose from the piping line to remove the internal blockage and clean it, which is inconvenient as it significantly impedes work efficiency. Also, when fresh concrete flows into the piping line, the internal pressure of the tip hose increases, and if a blockage or obstruction occurs, the internal pressure may increase too much and damage the tip hose. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2007-162818 A Summary of the Invention [Problem to be solved by the invention]

[0006] Therefore, if it is possible to detect blockage or a blockage that could lead to blockage in the tip hose, measures such as reducing the amount of ready-mixed concrete supplied or temporarily suspending supply can be taken, which is advantageous in preventing interruptions to work due to tip hose replacement or maintenance, etc.

[0007] To provide an improved wear-resistant hose capable of indicating when the internal pressure rises above a predetermined level, thereby enabling a tip hose that allows for efficient and trouble-free pouring of fresh concrete. [Means for solving the problem]

[0008] The present invention relates to an abrasion-resistant hose A, which comprises a hose body 1 made of a flexible material and a cylindrical connection fitting 2 which is integrally fitted to the base end of the hose body 1, and which is resistant to dimensional changes due to longitudinal expansion of the hose body 1. amount The display mechanism B is capable of displaying the above.

[0010] The indication mechanism includes a mark 12 printed on the hose body 1 and an indication device 13 attached to the connection port fitting 2, It is convenient if the relative positional relationship between the scale m marked on the indicator 13 and the mark 12 in the longitudinal direction can be read.

[0011] The indicator 13 has an attachment portion 13B that is attached to the connection port fitting 2, and an indicator main body 13A that extends in the longitudinal direction from the attachment portion, and it is preferable that the scale m is formed on a tip portion 13C of the indicator main body 13A.

[0012] The hose body 1 has a connection hose portion 1A that is fitted into the connection fitting 2, and a main hose portion 1B that continues from the connection hose portion 1A, and it is convenient for the mark 12 to be formed on the main hose portion 1B.

[0013] A reinforcing cord k that is wound in a spiral shape is embedded in the hose body 1, and an inclination angle θ of the reinforcing cord k with respect to an axis P of the hose body 1 is preferably set to be greater than a predetermined static angle β.

[0014] The wear-resistant hose A is advantageously configured as a tip hose for pouring fresh concrete. Effect of the Invention

[0015] According to the present invention, since a display mechanism capable of displaying the dimensional change of the hose body is provided, the expansion of the hose body due to the pressure rise caused by the supply of ready mixed concrete or clogging can be easily displayed. Zhang and Therefore, the display mechanism can display the dimensional change in terms of the pressure change based on the data of the dimensional change accompanying the pressure increase.

[0016] Therefore, it becomes possible to visually determine the load pressure when pouring fresh concrete, and to prevent clogging, blockage and the resulting damage. As a result, it is possible to provide an improved wear-resistant hose that can indicate when the internal pressure rises above a predetermined level, thereby realizing a tip hose that allows for efficient and trouble-free pouring of fresh concrete. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 is a plan view and a balloon view showing the base end of the tip hose and the indicator. [Diagram 2] A plan view and a balloon diagram showing the display mechanism when no pressure is applied [Diagram 3] Plan view and balloon diagram showing the display mechanism when pressure is applied [Figure 4] A partially cutaway side view of the base end showing the structure of the tip hose [Diagram 5] A side view of the hose body with a portion cut away showing the attachment angle [Figure 6] Indicates the inclination angle of the reinforcing layer. (A) is without pressure, (B) is with pressure DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] The embodiment of the wear-resistant hose according to the present invention will be described below with reference to the drawings, taking the case of a tip hose for pouring fresh concrete. Note that Fig. 5 shows the concept of the attachment angle θ, and the cross-sectional structure does not match that shown in Fig. 4. Also, in Figs. 4 and 5, the hatching of the inner and outer surface layers 3 and 4 and the reinforcing cords 5 to 9 has been omitted for ease of viewing.

[0019] 4, tip hose A (an example of an "abrasion-resistant hose") is a long hose having a hose body 1 made of rubber (an example of a flexible material) and a cylindrical connection fitting 2 that is fitted (integrally fitted) into the base end of the hose body 1. The base end of the cylindrical hose body 1 is firmly integrated with the tip end of the connection fitting 2, with the outside of the base end fitted over it.

[0020] As shown in Fig. 4, the connection port fitting 2 is a cylindrical metal fitting having a main body tubular portion 2A, a thick base end portion 2B formed at the base end thereof, a flange portion 2C formed in a longitudinal intermediate portion of the main body tubular portion 2A so as to protrude radially outward, and a small flange 2D formed at the tip end side of the main body tubular portion 2A. The base end side of the inner peripheral surface of the main body tubular portion 2A is formed into a tapered inner peripheral surface 2a with a gentle inclination angle such that the diameter becomes larger toward the base end. The side peripheral surface (notation omitted) on the base end side of the flange portion 2C and the side peripheral surface (notation omitted) on the tip end side of the small flange 2D are formed into surfaces inclined with respect to the axis P of the tip hose A.

[0021] As shown in Fig. 4, the hose body 1 is a reinforced hose with reinforcing layers 5-9 embedded in the middle of its thickness, and is made up of a connection hose portion 1A which is a hose base portion fitted onto a connection fitting 2, and a main hose portion 1B which is a reinforced hose portion which occupies most of the hose body. The hose body 1 has an inner surface layer (inner surface rubber) 3 made of rubber (synthetic rubber, etc.), an outer surface layer (outer surface rubber) 4 made of rubber (synthetic rubber, etc.), and reinforcing layers 5-9 which are disposed between the layers 3 and 4. The inner surface layer 3 and the outer surface layer 4 are connected and integrated in the radial direction at the front and rear ends of the hose body 1. The outer diameter of the main hose portion 1B is gently wavy in the axial direction due to the effect of the embedded reinforcing layers 5-9, but it can be said that the diameter is basically constant.

[0022] The reinforcing layers 5-9 provided radially between the inner surface layer 3 and the outer surface layer 4 are formed with inner and outer main reinforcing layers 5, 6 made of synthetic fibers or the like, inner and outer sub-reinforcing layers 7, 8 made of synthetic fibers or the like, and a spiral reinforcing wire 9 made of a steel wire (steel cord) or the like. The inner and outer main reinforcing layers 5, 6 and the inner and outer sub-reinforcing layers 7, 8 each constitute a reinforcing cord k. The various reinforcing layers 5 to 9 are laminated from the radially inner side to the radially outer side in the order of the inner main reinforcing layer 5, the inner sub-reinforcing layer 7, the reinforcing wire 9, the outer main reinforcing layer 6, and the outer sub-reinforcing layer 8. The inner main reinforcing layer 5 is provided in a double layer, inside and outside, but may be provided in a single layer, as in the tip portion 1b of the main hose portion 1B.

[0023] In the connection hose portion 1A, which has a larger diameter than the main hose portion 1B and whose diameter gradually changes in the hose longitudinal direction (in the direction of the axis P), the base end of the outer main reinforcing layer 6 is folded back radially outward while wrapping around a reinforcing ring 10 made of steel wire or the like. The reinforcing ring 10 is disposed immediately adjacent to the base end side of the flange portion 2C. In addition, the connection hose portion 1A is provided with an end reinforcing layer 11 made of synthetic fiber or the like, which is positioned continuously radially outward from the outer main reinforcing layer 6. The reinforcing ring 10 and the end reinforcing layer 11 are also reinforcing layers.

[0024] 1 to 3 and 4, there is provided an indication mechanism B capable of indicating dimensional change in the longitudinal direction (direction of axis P) of the hose body 1. The indication mechanism B comprises a mark 12 marked on the hose body 1 and an indication device 13 attached to the connection port fitting 2, and is configured so that the relative positional relationship in the longitudinal direction between any of the scales m marked on the indication device 13 and the mark 12 can be read.

[0025] 2 and 3, the mark 12 is configured by providing a small-width line 12A extending in the circumferential direction perpendicular to the axis P at the base end of the main hose section 1B. The line 12A may be arc-shaped or may be wound (provided) around the circumference. Although not shown, the mark 12 may be configured by providing two base lines spaced apart in the longitudinal direction of the hose.

[0026] 1 to 3, the indicator 13 has an attachment portion 13B for mounting and supporting the connection fitting 2, and an indicator main body 13A extending in the longitudinal direction (axis P direction) of the hose main body 1, and is conveniently made of, for example, a metal plate such as a steel plate or an aluminum alloy, or a synthetic resin plate. The tip of the indicator main body 13A is formed into an indicator portion 13C, and the indicator portion 13C has a notch portion 13D for a tip opening, the central portion in the width direction of which is recessed in a rectangular shape toward the base end side. The left and right sides of the notch portion 13D are formed into tip pieces 13a, 13b on which a plurality of scale marks m are marked at intervals in the axis P direction.

[0027] The display body 13A extends to a point where its tip (display section 13C) reaches the base end of the main hose section 1B, and a number of scale marks m are marked on each of the tip pieces 13a, 13b. As shown in the balloon diagram of Fig. 1, the scale marks m indicate five pressure values, 0 MPa, 0.3 MPa, 0.6 MPa, 0.9 MPa, and 1.0 MPa, in order from the base end side to the tip end side of the tip hose A.

[0028] The length of the display body 13A is set so that the mark 12 consisting of two adjacent lines 12A, 12A is located exactly in the notch 13D. Therefore, the display mechanism B is configured to be able to read the relative positional relationship in the longitudinal direction (axial center P direction) of the tip hose A between the multiple scales m marked on the left and right tip pieces 13a, 13b and the mark 12 appearing in the notch 13D.

[0029] Hose body 1 has the property of stretching slightly in the longitudinal direction of the hose (toward axis P) due to an increase in pressure (pressurization) caused by a fluid, such as ready-mixed concrete, flowing inside it. Therefore, when a blockage or obstruction occurs inside tip hose A and strong pressure is applied, hose body 1 clearly stretches in the longitudinal direction of the hose, making it possible to recognize the internal pressure from the stretched length.

[0030] An example of display using Display Mechanism B is as follows. Since the normal pressure when pouring fresh concrete is 0.3 MPa or less, Display Mechanism B normally fluctuates within the range of 0 to 0.3 MPa. Since the pressure rises when the hose is blocked, an extension equivalent to 1.0 MPa is set as abnormal pressure, based on a maximum operating pressure of 0.8 MPa and a burst pressure of 3.9 MPa or more.

[0031] Display mechanism B uses the principle that hose body 1 expands in the longitudinal direction when pressurized, and makes it possible to know the internal pressure of tip hose A from the positional relationship of mark 12 with display section 13C, more specifically, with scale m. For example, when not in use (no pressure), as shown in Figure 2 and its balloon diagram, display mechanism B indicates that mark 12 is aligned with scale m of 0 MPa, i.e., the internal pressure is 0.

[0032] When the fresh concrete is poured and the tip hose A is pressurized, its length expands. For example, as shown in Figure 3 and its bubble diagram, the hose body 1 expands significantly and the mark 12 matches the scale m of 1.0 MPa, i.e., the internal pressure is 1.0 MPa, as can be read from the display mechanism B. In this way, since a display mechanism B is provided that can be attached to the connection port fitting 2, the internal pressure of the tip hose A can be known in a timely manner while pouring fresh concrete, making it possible to prevent damage due to clogging or blockage.

[0033] [Example of Display Mechanism B] An example of the configuration of the indicator 13 will be described with reference to Fig. 1 and Fig. 4 (see imaginary lines). The indicator body 13A is arc-shaped when viewed from the axis P direction, and is shaped to closely follow the outer shape of the connection hose part 1A, which is shaped like a barrel and bulging outward in the diameter, i.e., it is made up of an expanded diameter part 14 whose diameter increases toward the tip, a reduced diameter part 15 whose diameter decreases toward the tip, and an indicator part 13C whose diameter is constant. It is preferable that the attachment part 13B is formed in a shape (e.g., C-shape) that allows it to be removably fitted onto the main body tubular part 2A of the connection port fitting 2. The left and right width of the base end side of the indicator body 13A is stepped and expanded to match the width of the attachment part 13B.

[0034] The display main body 13A may be provided with a C-shaped main body attachment means (not shown) made of a flexible material (such as spring steel) for fitting and supporting the display main body 13A in the connection hose part 1A or the main hose part 1B. The attachment part 13B may be made of a flexible material, such as a C-shaped spring steel, and may be structured so as to be detachably attached to the main body cylindrical part 2A in an elastically fastened state.

[0035] The mark 12 is formed by inserting a line by vulcanization transfer during the manufacture of the hose body 1, but may be formed by other means. For example, various modifications are possible, such as applying paint to the hose body 1, forming a groove on the outer periphery of the hose body 1 and applying paint to the groove, integrally forming an outer periphery groove that bulges outward radially into the hose body 1, or wrapping with adhesive tape.

[0036] [Example of tip hose A] 5, the reinforcing layers 5-9 embedded in the hose body 1 are wound with reinforcing cords k, specifically, the fibers of the inner and outer main reinforcing layers 5 and 6 and the outer sub-reinforcing layer 8, for example, the fibers 8a of the outer sub-reinforcing layer 8, at an attachment angle (one example of an inclination angle) θ inclined with respect to the axis P. In FIG. 5, 5a denotes the fibers of the inner main reinforcing layer, and 6a denotes the fibers of the outer main reinforcing layer 6.

[0037] In a hose body 1 (wear-resistant hose) having reinforcing layers 5-9, depending on various parameters such as the thickness and hardness of the inner layer 3 and outer layer 4, or the wire diameter and spiral shape of the reinforcing wire 9, there exists a static angle β for the attachment angle θ at which the length does not change even when the internal pressure of the hose body 1 increases (pressurizes).

[0038] In other words, when the hose body 1 is pressurized, if the attachment angle θ is greater than the rest angle β, the hose body 1 expands and displaces in the direction of the axis P while contracting in diameter, and if it is smaller than the rest angle β, the hose body 1 contracts and displaces in the direction of the axis P while expanding in diameter. In the tip hose A of this embodiment, the attachment angle θ of the reinforcing cord k is set to 64 to 65 degrees, which is greater than the rest angle β (54.7 degrees) [see FIG. 6(A)].

[0039] As shown in Figure 6(A), when the attachment angle θ is greater than a given rest angle β (e.g. 54.7 degrees) (e.g. 65 degrees), pressurization (sealing of internal pressure) by pouring ready mixed concrete, etc., acts to make the reinforcing cord k approach the rest angle β (e.g. 54.7 degrees). Therefore, as shown in Figure 6(B), the hose body 1 contracts in diameter while expanding (stretching) in the longitudinal direction of the hose (direction of axis P). For example, if the length of the hose in the longitudinal direction is L, it changes to L+α when pressurized.

[0040] If the internal pressure (inner pressure) of tip hose A (hose body 1) is defined as (a) MPa, the total length of the hose is (b) mm, the elongation is (c) mm, and the stretch rate is (d) %, the following data (reference data for pressurized elongation) 1 to 5 are obtained as examples. 1: (a) 0 (b) 500 (c) 0 (d) 0 2:(a)0.3 (b)514 (c)14 (d) 2.80 3:(a)0.6 (b)532 (c)32 (d)6.40 4:(a)0.9 (b)550 (c)50 (d)10.00 5:(a)1.0 (b)555 (c)55 (d)11.00

[0041] [About the effects] As mentioned above, in general, many of the tip hoses (wear-resistant hoses) A ​​having a spiral reinforcing cord k are designed so that the hose body 1 stretches when pressurized. Therefore, the wear-resistant hose A of the present invention, which is equipped with the display mechanism B, makes it possible to check the pressurization status by utilizing the stretching of the hose body 1.

[0042] Previously, when using a hose tip for pouring ready-mixed concrete, there was no means or method for checking the pressurization status (including abnormal internal pressure), making it difficult to determine whether a blockage or obstruction had occurred.

[0043] However, by realizing the display mechanism B that converts the extension of the hose into pressure, when the dimensions of the hose body 1 change due to pressurization, specifically the change in length, the pressurization value (internal pressure value of the tip hose A) which is the internal pressure, is displayed according to the amount of extension. Therefore, even during work such as pouring ready-mixed concrete, by visually checking the display mechanism B, the pressurization status of the tip hose A can be visually confirmed. Therefore, there is an advantage in that the display of the mark 12 and the scale m allows you to instantly determine whether the pressurization value is within the normal range or an abnormally high value.

[0044] Furthermore, the display mechanism B for this purpose can be realized by a simple and inexpensive means consisting of an indicator 13 attached to the connection port fitting 2 and a mark 12 printed on the hose body 1, which has the advantage of being able to solve the conventional problems in an economical and rational manner.

[0046] Although not shown in the figures, the indicator 13 can be modified in various ways, such as an L-shaped cross section cut in the direction of the axis P, or a flat plate-like shape when viewed in the direction of the axis P. The present invention can be applied to all wear-resistant hoses other than tip hoses, such as docking hoses and pumping tubes used in pouring fresh concrete. [Explanation of symbols]

[0047] 1 Hose body 1A Connection hose part 1B Main hose section 2 Connection port fitting 12 Marks 13 Indicators 13A Display unit 13B Mounting part 13C Tip A Tip hose (wear-resistant hose) B Display mechanism P axis center k Reinforcement cord m scale θ Affixing angle (inclination angle) β resting angle

Claims

1. An abrasion-resistant hose comprising a hose body made of a flexible material, a cylindrical connection fitting that is integrally fitted into a base end of the hose body, and a display mechanism that can display the amount of dimensional change due to longitudinal expansion of the hose body.

2. The indication mechanism includes a mark printed on the hose body and an indication device attached to the connection port fitting, 2. The abrasion resistant hose according to claim 1, wherein the relative positional relationship in the longitudinal direction between the scale marked on the indicator and the mark is readable.

3. 3. The abrasion-resistant hose according to claim 2, wherein the indicator has an attachment portion attached to the connection port fitting and an indicator main body portion extending in the longitudinal direction from the attachment portion, and the scale is formed at a tip portion of the indicator main body portion.

4. 4. The wear-resistant hose according to claim 2, wherein the hose body has a connection hose portion that is fitted into the connection fitting and a main hose portion that continues from the connection hose portion, and the mark is formed on the main hose portion.

5. 5. The abrasion-resistant hose according to claim 1, wherein a reinforcing cord that is spirally wound is embedded in the hose body, and an inclination angle of the reinforcing cord with respect to an axis of the hose body is set to be larger than a predetermined static angle.

6. The wear-resistant hose according to any one of claims 1 to 5, which is configured as a tip hose for pouring fresh concrete.

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