JP4432121B1 - Manufacturing method of hydraulic hose - Google Patents

Abstract

An object of the present invention is to provide a method of manufacturing a hydraulic hose that can be manufactured by an inexpensive device.
When the belt-like member 28 reaches the end of the mandrel 30, the belt-like member 28 is hooked on the hooking members 46, 48, and the rotation of the mandrel 30 is reversed and the belt-like member 28 is continued. Then, the spiral reinforcing layer can be formed by being wound around the mandrel 30. Each time the belt-like member 28 reaches the end of the mandrel 30, the belt-like member 28 is not fixed and cut each time, and there is no need to use an expensive spiral machine. Therefore, the spiral reinforcing layer can be easily and efficiently manufactured using an inexpensive device, and the hydraulic hose 10 can be easily manufactured using an inexpensive device.
[Selection] Figure 1

Description

  The present invention relates to a method for manufacturing a hydraulic hose, and more particularly, to a method for manufacturing a hydraulic hose including a spiral reinforcing layer in which a steel cord is spirally wound.

There is provided a high-pressure hydraulic hose in which a plurality of spiral reinforcing layers are laminated between a tube (tube rubber layer) constituting an innermost layer and a cover (cover rubber layer) constituting an outermost layer.
The spiral reinforcing layer of this type of high-pressure hydraulic hose is composed of a steel cord wound spirally and a coat rubber covering the steel cord.
Conventionally, the spiral reinforcing layer is manufactured by rotating a mandrel while simultaneously feeding out a plurality of steel cords and coat rubbers by a spiral machine and spirally winding the mandrel (Patent Document 1).
JP-A-10-44214

However, since this spiral machine has a complicated structure and is expensive, the advent of a manufacturing method capable of manufacturing a hydraulic hose with an inexpensive device has been desired.
The objective of this invention is providing the manufacturing method of the hydraulic hose which can be manufactured with an inexpensive apparatus.

In order to achieve the above object, the present invention provides a method of manufacturing a hydraulic hose having a spiral reinforcing layer, and a belt-like coat rubber extending with a width having a certain dimension larger than the thickness, and an extension of the coat rubber. Provided with a strip-shaped member composed of a plurality of steel cords arranged in the width direction so as to extend parallel to each other along the existing direction and held by the coat rubber, and having a length larger than the width of the strip-shaped member And a pair of rotatable guide rollers extending in a direction perpendicular to the length direction of the belt-like member and sandwiching the belt-like member, and the belt-like member is fed out onto the mandrel from between the pair of guide rollers. the feeding portion is provided, at a location spaced longitudinally of the mandrel is provided with a hooking member that projects radially outwardly of the mandrel, respectively, it said Repetitive rotated forward the mandrel While moving toward the longitudinal end of the mandrel along the out portion to the mandrel feeding the belt-shaped member, will wound spirally one surface in the thickness direction of the belt-shaped member onto said mandrel, the strip If the member is positioned in the vicinity of one of the two latching members, the belt-like member is latched on the latching member, and after the latching, the mandrel is reversed to rotate the feeding portion . The belt-like member is fed out while moving toward the other end in the longitudinal direction of the mandrel along the mandrel, and is already wound on the mandrel so that the end in the width direction is overlapped with the belt-like member already wound. The same surface as the other surface is spirally wound, and the belt-shaped member is positioned in the vicinity of the other latching member of the two latching members. Locks hanging in, latching post, said mandrel feeding the belt-shaped member while moving toward the longitudinal end of the mandrel along the mandrel the feeding portion is rotated forward and width to the belt-shaped member wound already The same surface as the already wound surface is spirally wound on the mandrel so that the ends in the direction are overlapped, and the mandrel is forwardly and reversely rotated and hooked on the hooking member. The same surface of the belt-like member is continuously wound on the mandrel in a spiral shape to form a spiral reinforcing layer.

  According to the present invention, a spiral reinforcing layer can be formed by spirally winding a belt-shaped member on a mandrel, and a hydraulic hose can be easily manufactured without using an expensive spiral machine.

Embodiments of the present invention will be described below with reference to the drawings.
16A is a cross-sectional view of a hydraulic hose to be manufactured, and FIG. 16B is an exploded explanatory view.
The hydraulic hose 10 manufactured according to the embodiment includes a tube 12 (tube rubber layer) constituting the innermost layer and first to fourth spiral reinforcing layers 14, 16, 18, 20 wound around the outer peripheral surface of the tube 12. And a cover 22 (cover rubber layer) provided on the outer peripheral surface of the fourth spiral reinforcing layer 20, and is configured as a high-pressure hydraulic hose 10, that is, a high-pressure hydraulic hose.
The tube 12 has, for example, oil resistance and elasticity, and the material and thickness of the tube 12 are appropriately set based on the specifications of the hydraulic hose 10 to be manufactured.
The first to fourth spiral reinforcing layers 14, 16, 18, and 20 are laminated on the outer peripheral surface of the tube 12 in that order.

FIGS. 17A, 17B, and 17C are explanatory views of a band-shaped member.
When manufacturing the hydraulic hose 10, first, a belt-like member 28 for forming the first to fourth spiral reinforcing layers 14, 16, 18, 20 is prepared in advance.
That is, the first band-shaped member 28A for forming the first spiral reinforcing layer 14, the second band-shaped member 28B for forming the second spiral reinforcing layer 16, and the third band-shaped for forming the third spiral reinforcing layer 18. A member 28C and a fourth belt-like member 28D for forming the fourth spiral reinforcing layer 20 are manufactured.
Each belt-like member 28 is constituted by a belt-like unvulcanized coat rubber 24 extending with a certain width larger than the thickness, and a plurality of steel cords 26 held by the coat rubber 24.
The plurality of steel cords 26 are arranged side by side in the width direction of the coat rubber 24 along the length direction of the coat rubber 24.
And each spiral reinforcement layer 14, 16, 18, 20 is comprised because these strip | belt-shaped members 28 are wound helically.
The material of the coat rubber 24, the wire diameter of the steel cord 26, the interval (arrangement density) of the steel cord 26, the winding angle of the steel cord 26, and the like are appropriately set based on the specifications of the hydraulic hose 10 to be manufactured.

As shown in FIG. 17A, the belt-like member 28 may have a structure in which the entire steel cord 26 is embedded in the belt-like coat rubber 24. That is, the plurality of steel cords 26 are arranged in the width direction of the coat rubber 24, and the plurality of steel cords 26 are entirely embedded in the coat rubber 24.
Alternatively, as shown in FIG. 17B, the belt-like member 28 may have a structure in which a part of each steel cord 26 is exposed over the entire length in the longitudinal direction on the surface of the belt-like coat rubber 24. Good. That is, the plurality of steel cords 26 are arranged side by side in the width direction of the coat rubber 24, and the plurality of steel cords 26 are embedded in the coat rubber 24 so that some of them are exposed on the surface of the coat rubber 24. Yes.

Alternatively, the belt-like member 28 may have a structure in which the radial half of each steel cord 26 is exposed on the surface of the belt-like coat rubber 24 as shown in FIG. That is, the plurality of steel cords 26 are arranged side by side in the width direction of the coat rubber 24, and the plurality of steel cords 26 are exposed on the surface of the coat rubber 24 over the entire length of the steel cord 26. The remaining half of their cross-section is embedded.
Of course, the number of spiral reinforcing layers is appropriately set to 3 layers or less or 5 layers or more based on the specifications of the hydraulic hose 10 to be manufactured.
The belt-like member 28 is covered with sulfur-based powder so that the handling thereof can be easily performed. On the other hand, the steel cord 26 is subjected to brass plating or the like on its surface.
Therefore, as shown in FIGS. 17B and 17C, when the surface of the steel cord 26 is exposed from the coat rubber 24, the plating layer and sulfur cause a chemical reaction, and the steel cord 26 is the counterpart coat rubber 24. In addition, it is advantageous when firmly joined by the tube 12 and the cover 22.

FIG. 18 shows a plan view of an apparatus used for manufacturing the hydraulic hose 10.
One end of the mandrel 30 is supported by the chuck 34 of the rotating device 32, and the other end of the mandrel 30 is supported by the core pusher 36.
A rail 38 extending along the longitudinal direction of the mandrel 30 is provided, and a running table 40 is provided on the rail 38 so as to be able to run. A drum 42 is rotatably supported on the running table 40.
The belt-like member 28 is wound around the drum 42, and the belt-like member 28 is fed from the drum 42 through the plurality of guide rollers and the feeding portion 44 onto the mandrel 30, and a braking force is applied to the drum 42, whereby the belt-like member 28 is applied. Tension is applied.
As shown in FIG. 1, the feeding portion 44 has a length larger than the width of the band-shaped member 28, extends in a direction perpendicular to the length direction of the band-shaped member 28, and is a pair of rotatable members that sandwich the band-shaped member 28. Guide rollers, that is, a first guide roller 44A, a second guide roller 44B, and an arm (not shown) that rotatably supports the guide rollers 44A and 44B. An arm (not shown) is provided so as to be able to turn in a horizontal plane, and the arm is perpendicular to a plane including the axis of the two guide rollers 44A and 44B, and the center of gravity of the object obtained by combining the two guide rollers 44A and 44B. The guide rollers are provided so as to be rotatable around a passing axis, and are provided so as to be movable up and down.

When the belt-like member 28 is prepared as described above, the innermost layer tube 12 is put on the mandrel 30.
Then, the belt-like member 28 is spirally wound around the tube 12 of the mandrel 30.
When winding the belt-like member 28 around the mandrel 30, the widthwise ends of the belt-like member 28 are overlapped as shown in FIG. 19A due to the tension applied to the belt-like member 28 and the strength to support the mandrel 30. The spiral reinforcing layer cannot be formed by one-time winding of the band-shaped member 28 while matching.
Therefore, as shown in FIGS. 19B, 19C, and 19D, the belt-like member 28 is first wound once in a spiral shape with an interval in the axial direction. In the second time, the belt-like member 28 is spirally wound while overlapping the end portions in the width direction on the belt-like member 28 that has already been wound. In the third time, the belt-like member 28 is spirally wound while overlapping the end portions in the width direction on the belt-like member 28 wound in the second time. In this way, the spiral reinforcing layer is formed by winding the belt-like member 28 a plurality of times.
When the belt-like member 28 is wound around the mandrel 30 a plurality of times as described above, if the belt-like member 28 reaches the end of the mandrel 30, the belt-like member 28 is fixed to the end of the mandrel 30 and cut each time. It is conceivable to wind the belt-like member 28 from the winding start position, but fixing and cutting the belt-like member 28 each time is disadvantageous in increasing the manufacturing efficiency of the hydraulic hose 10.

Therefore, in the present embodiment, the following is performed.
As shown in FIGS. 1, 9, and 20 to 32, hook members 46 and 48 that protrude outward in the radial direction of the mandrel 30 are provided at positions spaced in the longitudinal direction of the mandrel 30. In the present embodiment, hooking members 46 and 48 are provided at locations near both ends of the mandrel 30, respectively.
In this case, the distance in the longitudinal direction of the mandrel 30 is a dimension larger than the length of the spiral reinforcing layer (hydraulic hose) to be manufactured. Is a dimension larger than the length of the spiral reinforcing layer to be manufactured.
The latch members 46 and 48 are provided so as to penetrate in the diameter direction of the mandrel 30.

Then, as shown in FIG. 1, the mandrel 30 is rotated in the forward direction to travel on the traveling platform 40, and the belt-like member 28 (first belt-like member 28 </ b> A) is fed out from the drum 42.
More specifically, the feeding portion 44 is positioned in the vicinity of the upper surface of the mandrel 30 so that the belt-like member 28 is wound at a highly accurate winding angle, and the feeding portion 44 extends along one end of the mandrel 30 along the mandrel 30. The belt-shaped member 28 is fed out while being moved toward the upper surface, and is wound around the upper surface of the mandrel 30 spirally (to the left).
In this case, the surface 2802 of the band-shaped member 28 that comes into contact with the second guide roller 44 </ b> B out of both surfaces in the thickness direction of the band-shaped member 28 is wound around the mandrel 30.
Further, the mandrel 30 rotates in a direction in which the upper surface of the mandrel 30 is separated from the feeding portion 44 by forward rotation.

As shown in FIGS. 2 and 20, when the belt-like member 28 is positioned in the vicinity of the hooking member 46, the rotation of the mandrel 30 is stopped and the feeding portion 44 is moved to the mandrel as shown by the arrow in FIG. Separate from 30.
Then, as shown in FIG. 21, the feeding portion 44 is moved toward the longitudinal end of the mandrel 30 (to the left) to a position beyond the latch member 46, and as shown in FIGS. 3 and 22, the mandrel 30 is moved. , And the belt-like member 28 is hooked on the hooking member 46.
Then, as shown in FIGS. 4 and 23, the rotation of the mandrel 30 is stopped, and the feeding portion 44 is moved toward the other end in the longitudinal direction of the mandrel 30 (to the right) so as to pass the hooking member 46. The belt-shaped member 28 is wound around the latching member 46 and latched.

In this case, the surface 2802 of the belt-shaped member 28 that comes into contact with the second guide roller 44B is wound in contact with the latching member 46 and is latched, in other words, the belt-shaped member 28 that is wound around the mandrel 30. The surface 2802 comes into contact with the latch member 46 and is wound and latched. Reference numeral 2804 in the drawing indicates a surface located opposite to the surface 2802 wound around the mandrel 30 among the both surfaces located at the end of the strip-shaped member 28 in the thickness direction.
After the hooking, as shown in FIGS. 5 and 24, the mandrel 30 is reversed, and the same surface 2802 of the belt-like member 28 is wound around the tube 12 as indicated by an arrow X in FIG. In this manner, the feeding portion 44 is rotated 180 degrees.
Then, as shown in FIG. 6, the rotation of the mandrel 30 is stopped, and the feeding portion 44 is lowered so as to be positioned on the lower surface of the mandrel 30 as indicated by the arrows in FIG.
Next, as shown in FIG. 7, the feeding portion 44 is brought close to the mandrel 30 so that the belt-like member 28 is wound at a highly accurate winding angle.

Next, as shown in FIGS. 26 and 8, the mandrel 30 is reversed and the traveling table 40 is reversely moved to wind the belt-like member 28 on the lower surface of the mandrel 30 spirally (to the right). Also in this case, the surface 2802 of the belt-like member 28 that comes into contact with the second guide roller 44B is wound around the mandrel 30.
That is, after the feeding portion 44 is rotated, the feeding portion 44 is lowered so as to be positioned near the lower surface of the mandrel 30 and the mandrel 30 is reversed. By this reverse rotation, the mandrel 30 rotates in a direction in which the lower surface thereof is separated from the feeding portion 44, and the belt-like member 28 is moved while moving the feeding portion 44 along the mandrel 30 toward the other end in the longitudinal direction of the mandrel 30 (to the right). Is wound around and spirally wound around the lower surface of the mandrel 30. More specifically, the belt-like member 28 is spirally wound around the mandrel 30 while overlapping the widthwise end of the belt-like member 28 already wound around the mandrel 30.

As shown in FIGS. 9 and 27, if the belt-like member 28 is positioned in the vicinity of the right hooking member 48, as shown in FIGS. 10 and 28, the rotation of the mandrel 30 is stopped and the feeding portion 44 is moved to the mandrel. Separate from 30.
Then, as shown in FIGS. 11 and 29, the feeding portion 44 is moved toward the other end in the longitudinal direction of the mandrel 30 (to the right) and moved to a position beyond the latch member 48.
Then, as shown in FIGS. 12 and 30, the mandrel 30 is rotated forward, and the belt-like member 28 is wound around the hooking member 48 and hooked, and in this case, the feeding portion 44 is set in FIG. As shown by an arrow Y in FIG. 29, it rotates 180 degrees in the opposite direction to the arrow X. Also in this case, the surface 2802 of the belt-like member 28 wound around the mandrel 30 comes into contact with the hooking member 48 and is wound and hooked.
When the feeding portion 44 is rotated 180 degrees in the opposite direction for each of the latching members 46 and 48 at both ends in this manner, the feeding portion 44 and the drum 42 are twisted 180 degrees and reversed 180 degrees. It is returned to the original state, and the state of is repeated, and every time the belt-like member 28 is hooked on the hooking members 46, 48, the belt-like member 28 is continuously twisted and prevented from being damaged, This is advantageous in easily manufacturing the hydraulic hose 10 using an inexpensive device.
In addition, when the belt-like member 28 is hooked and wound around the right-hand hook member 48 as described above, the belt-like member 28 moves so that the front and back thereof are turned over. Therefore, as shown in FIGS. When the shape of the stop member 48 is a triangular shape (wedge shape) that decreases in width as it reaches the tip and is inclined obliquely (for example, 45 degrees) with respect to the rotation direction of the mandrel, the belt-like member 28 is reversed according to this shape. Therefore, the belt-like member 28 is smoothly wound and hooked on the hooking member 48.

After the hooking, as shown in FIGS. 13 and 31, the rotation of the mandrel 30 is stopped, and the feeding portion 44 is moved toward one end in the longitudinal direction of the mandrel 30 to a position before the hooking member 48. Let
Then, as shown in FIG. 14, the feeding portion 44 is raised so as to be positioned in the vicinity of the upper surface of the mandrel 30.
Then, as shown in FIGS. 15 and 32, the feeding portion 44 is brought close to the mandrel 30 so that the belt-like member 28 is wound at a highly accurate winding angle, the mandrel 30 is rotated forward, and the carriage 40 is advanced. Then, the belt-like member 28 is spirally wound on the mandrel 30.
That is, after the feeding portion 44 is rotated, the feeding portion 44 is raised so as to be positioned near the upper surface of the mandrel 30, the mandrel 30 is rotated forward, and the feeding portion 44 is moved along the mandrel 30 toward one end in the longitudinal direction of the mandrel 30. The belt-like member 28 is fed out and wound around the mandrel 30 while being moved. More specifically, the belt-shaped member 28 is spirally wound around the mandrel 30 without gaps while the widthwise ends of the belt-shaped member 28 already wound around the mandrel 30 are overlapped. Also in this case, the surface 2802 of the belt-like member 28 that comes into contact with the second guide roller is wound around the mandrel 30.

If the belt-like member 28 is positioned in the vicinity of the hooking members 46 and 48 in this way, the belt-like member 28 is hooked on the hooking members 46 and 48, and after the hooking, the rotation of the mandrel 30 is reversed. A band-shaped member 28 is spirally wound on the top without any gap to form a first spiral reinforcing layer.
More specifically, if the belt-like member 28 is positioned in the vicinity of the hooking members 46, 48, the belt-like member 28 is hooked on the hooking members 46, 48, and the same surface of the belt-like member 28 is always on the mandrel 30. After being hooked so as to be wound, the feeding portion 44 is rotated 180 degrees in the opposite direction for each of the hooking members 46 and 48 at both ends, and the rotation of the mandrel 30 is reversed to spiral the band-like member 28 on the mandrel 30 without any gap. And the first spiral reinforcing layer 14 is formed.
In addition, in the location of the mandrel 30 in the vicinity of the latching members 46 and 48, the winding angle is different from other locations because of the relationship in which the belt-like member 28 is latched to the latching members 46 and 48, and the uniform properties are not achieved. Therefore, the spiral reinforcing layer portion formed in the vicinity of the latching members 46 and 48 is removed and discarded.

Next, the second spiral reinforcing layer 16 is formed.
That is, the traveling platform 40 supports the drum 42 around which the second belt-shaped member 28B is wound, rotates the mandrel 30, feeds the second belt-shaped member 28B from the drum 42, and travels the traveling platform 40 to move the second belt-shaped member. The member 28B is spirally wound on the first spiral reinforcing layer 14 to form the second spiral reinforcing layer 16.
Further, the third strip-shaped member 28C is wound on the second spiral reinforcing layer 16 to form the third spiral reinforcing layer 18, and the fourth strip-shaped member 28D is wound on the third spiral reinforcing layer 18 to form the fourth spiral reinforcing layer. Shape 20
When the first to fourth belt-like members 28A, 28B, 28C, and 28D are wound, a braking force is applied to the drum 42 to give the belt-like member 28 tension, and thus the belt-like member 28 is given tension. Then, it is advantageous in attaching the wrapping to the steel cord 26 of each belt-like member 28.
Further, the first belt-like member 28A is formed on the mandrel 30 so as to be stacked in four layers, and each of the first to fourth spiral reinforcing layers is formed. Alternatively, the first belt-like member 28A is formed on the mandrel 30 so as to be stacked in two layers. 1. The second spiral reinforcing layer is formed, and the second belt-like member 28B is formed on the mandrel 30 so as to overlap with each other to form the third and fourth spiral reinforcing layers, or the number of spiral reinforcing layers to be stacked. Are appropriately set based on the specifications of the hydraulic hose 10 to be manufactured.

Finally, the fourth spiral reinforcing layer 20 is covered with a cover 22.
A material having weather resistance and elasticity is used for the cover 22, and the material and thickness of the cover 22 are appropriately set based on the specifications of the hydraulic hose 10 to be manufactured.
After vulcanization, the mandrel 30 is pulled out by various conventionally known methods, and the hydraulic hose 10 having the first to fourth spiral reinforcing layers is obtained.

According to the method of manufacturing the hydraulic hose 10 of the present embodiment, when the belt-like member 28 reaches the end of the mandrel 30, the belt-like member 28 is hooked on the hooking members 46 and 48, and the mandrel 30 is rotated. The spiral reinforcing layer can be formed by continuously winding the belt-shaped member 28 around the mandrel 30 in the reverse direction.
Therefore, each time the belt-like member 28 reaches the end of the mandrel 30, the belt-like member 28 is not fixed and cut, and an expensive spiral machine is not required, and a spiral reinforcement layer is formed using an inexpensive device. The hydraulic hose 10 can be easily and efficiently manufactured, and the hydraulic hose 10 can be easily manufactured using an inexpensive device.

It is a manufacturing process figure of a spiral reinforcement layer, (A) is a front view, (B) is a side view. It is a manufacturing process figure of a spiral reinforcement layer, (A) is a front view, (B) is a side view. It is a manufacturing process figure of a spiral reinforcement layer, (A) is a front view, (B) is a side view. It is a manufacturing process figure of a spiral reinforcement layer, (A) is a front view, (B) is a side view. It is a manufacturing process figure of a spiral reinforcement layer, (A) is a front view, (B) is a side view. It is a manufacturing process figure of a spiral reinforcement layer, (A) is a front view, (B) is a side view. It is a manufacturing process figure of a spiral reinforcement layer, (A) is a front view, (B) is a side view. It is a manufacturing process figure of a spiral reinforcement layer, (A) is a front view, (B) is a side view. It is a manufacturing process figure of a spiral reinforcement layer, (A) is a front view, (B) is a side view. It is a manufacturing process figure of a spiral reinforcement layer, (A) is a front view, (B) is a side view. It is a manufacturing process figure of a spiral reinforcement layer, (A) is a front view, (B) is a side view. It is a manufacturing process figure of a spiral reinforcement layer, (A) is a front view, (B) is a side view. It is a manufacturing process figure of a spiral reinforcement layer, (A) is a front view, (B) is a side view. It is a manufacturing process figure of a spiral reinforcement layer, (A) is a front view, (B) is a side view. It is a manufacturing process figure of a spiral reinforcement layer, (A) is a front view, (B) is a side view. (A) is sectional drawing of the hydraulic hose to manufacture, (B) is decomposition | disassembly explanatory drawing. (A), (B), (C) is explanatory drawing of a strip | belt-shaped member. It is a top view of the apparatus used for manufacture of a hydraulic hose. (A), (B), (C), (D) is explanatory drawing which winds a strip | belt-shaped member around a mandrel. It is a perspective view at the time of winding a belt-shaped member around one latching member, and latching. It is a perspective view at the time of winding a belt-shaped member around one latching member, and latching. It is a perspective view at the time of winding a belt-shaped member around one latching member, and latching. It is a perspective view at the time of winding a belt-shaped member around one latching member, and latching. It is a perspective view at the time of winding a belt-shaped member around one latching member, and latching. It is a perspective view at the time of winding a belt-shaped member around one latching member, and latching. It is a perspective view of the state which wound the belt-shaped member around one latching member, and latched. It is a perspective view at the time of winding a belt-shaped member around the other latching member, and latching. It is a perspective view at the time of winding a belt-shaped member around the other latching member, and latching. It is a perspective view at the time of winding a belt-shaped member around the other latching member, and latching. It is a perspective view at the time of winding a belt-shaped member around the other latching member, and latching. It is a perspective view at the time of winding a belt-shaped member around the other latching member, and latching. It is a perspective view at the time of winding a belt-shaped member around the other latching member, and latching.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Hydraulic hose, 28 ... Band-shaped member, 14 ... 1st spiral reinforcement layer, 16 ... 2nd spiral reinforcement layer, 18 ... 3rd spiral reinforcement layer, 20 ... 4th spiral reinforcement layer, 30 ... ... Mandrel, 44 ... Feeding part, 46, 48 ... Hanging member.

Claims (6)

A method for producing a hydraulic hose having a spiral reinforcement layer,
A belt-like coat rubber extending with a width of a certain dimension larger than the thickness, and arranged in the width direction so as to extend parallel to each other along the extending direction of the coat rubber, and held by the coat rubber Provided with a belt-shaped member composed of a plurality of steel cords,
A pair of rotatable guide rollers having a length greater than the width of the belt-like member and extending in a direction perpendicular to the length direction of the belt-like member and sandwiching the belt-like member; A feeding part is provided for feeding the belt-like member over the mandrel from between,
A hook member that protrudes outward in the radial direction of the mandrel is provided at a place spaced in the longitudinal direction of the mandrel,
The mandrel is rotated forward and the belt-shaped member is fed out while moving the feeding portion along the mandrel toward one end in the longitudinal direction of the mandrel, and one surface in the thickness direction of the belt-like member is spirally formed on the mandrel. Wrap around
If the strip member is located in the vicinity of one of the two latch members, the strip member is latched to the latch member,
After the hooking, the mandrel is reversed and the belt-like member is fed out while moving the feeding portion along the mandrel toward the other end in the longitudinal direction of the mandrel. On the mandrel to be stacked, the same surface as the surface already wound is spirally wound,
If the belt-like member is located in the vicinity of the other hook member of the two hook members, the belt-like member is hooked to the hook member,
After the hooking, the mandrel is rotated forward and the belt-like member is fed out while moving the feeding portion along the mandrel toward one end in the longitudinal direction of the mandrel. On the mandrel to be stacked, the same surface as the surface already wound is spirally wound,
Thus, while rotating the mandrel forward and backward and hooking on the hook member, the same surface of the strip member was continuously spirally wound on the mandrel to form a spiral reinforcing layer.
A method of manufacturing a hydraulic hose characterized by the above. When the band-shaped member is wound around the mandrel, tension is applied to the band-shaped member.
The method of manufacturing a hydraulic hose according to claim 1 . The plurality of steel cords are entirely embedded in the coat rubber,
The method of manufacturing a hydraulic hose according to claim 1 or 2, The plurality of steel cords are embedded so that a part of their cross-section is exposed on the surface of the coat rubber over the entire length in the longitudinal direction.
The method of manufacturing a hydraulic hose according to claim 1 or 2, The plurality of steel cords are embedded in the remaining half of their cross sections so that half of their cross sections are exposed on the surface of the coated rubber over the entire length of the steel cords,
The method of manufacturing a hydraulic hose according to claim 1 or 2, The innermost layer of the hydraulic hose is composed of a tube,
The tube is covered on the mandrel,
The strip member is wound on the tube,
The method for manufacturing a hydraulic hose according to any one of claims 1 to 5 , wherein the hydraulic hose is manufactured as described above.

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