JP2010078054A - Protection device for flexible hose unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a protection device for a flexible hose unit, capable of preventing swinging by an overload and damages to an apparatus, when using the flexible hose unit, with a simple constitution, and safely performing work even in handling operation. <P>SOLUTION: This protection device has a coupling connected to a rotary input shaft; the flexible hose unit having one end detachably connected to the coupling and setting the other end side as the rotation output side, and inserting a freely bendable and axially freely rotatable flexible shaft into a freely bendable flexible hose; and a rotation transmitting member freely attachable-detachable to/from the coupling and the flexible shaft and simultaneously fitting its part to the respective receiving parts of the coupling and the flexible shaft. The rotation transmitting member transmits a rotation input from the coupling to a rotation output to the flexible shaft, and the rotation transmitting member cuts off the transmission of rotation by rupturing in an excessive rotation load from the flexible shaft side. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a protection device for a flexible hose unit including a flexible shaft that flexibly transmits rotational input.

  Conventionally, in chemical mixing machines, pesticide sprayers, mowers, and other industrial equipment, the rotary input side and rotary output side are connected by a flexible hose unit that incorporates a flexible shaft that can be bent or bent. Rotating force is flexibly transmitted to the output side, making it easy to operate the equipment on the output side, and installing with the transmission shaft in the middle of rotation input / output bent, ensuring the freedom of equipment and installation, compact installation space There is known a rotation transmission mechanism that realizes downsizing, downsizing and cost reduction of the apparatus. For example, the example is shown in the stirring apparatus of patent document 1. FIG.

Shoko 51-47116

  As shown in FIG. 10, the above-mentioned Patent Document 1 connects a stirrer R and a sprayer S arranged in a chemical tank N with a flexible hose unit T, and is driven by a prime mover U such as a generator. A rotating shaft arranged in a wire frame V of the stirrer R is connected to a rotating shaft such as a crankshaft of the rotating shaft, and a rotating blade disposed in the wire frame V of the stirring device R is rotated to stir the chemical in the chemical tank. The sprayer S sprays the mixed chemical solution onto the target area of the desired planting site while sucking the mixed chemical solution. The flexible hose unit T is a flexible pressure-resistant flexible hose in which a flexible shaft is inserted so as to be rotatable about its longitudinal axis, and there is a difference in height between the sprayer S and the opening of the chemical tank N. In addition, it is possible to easily transmit the rotational force even when various equipment and the like are arranged on the way and piping cannot be performed straight. By the way, the flexible shaft inserted in the pressure-resistant flexible hose is constructed by winding a metal wire around a core steel wire around a plurality of belt-like layers, and maintains high strength with respect to flexibility and rotation around the axis. Thus, the rotational force can be transmitted in a flexible manner. However, in the conventional flexible hose unit configuration, when the flexible shaft is rotated by the rotational input from the prime mover or the sprayer S via the prime mover, the friction between the strands, the internal friction of the strands itself, the flexible, The friction caused by direct contact between the shaft and the flexible hose increases the rotational resistance, possibly overloading the rotational input side. Also, if the liquid in the chemical tank N is highly viscous or if foreign matter such as string or stone is mixed, a large rotational load is applied to the flexible shaft side, and the longitudinal intermediate part of the flexible hose unit is greatly swung around. Or vibration may occur in the entire hose. Furthermore, if the overload operation continues, the metal strand may be broken, and may break apart inside, eventually damaging the flexible hose, and the entire flexible hose unit may need to be replaced.

  The present invention has been made in view of the above-described conventional problems. One object of the present invention is to prevent a vibration and a hose from being damaged due to an overload when a flexible hose unit is used with a simple configuration. It is another object of the present invention to provide a protective device for a flexible hose unit that can be safely operated.

  In order to achieve the above object, the present invention includes a coupling 12 connected to the rotary input shaft 14 and a flexible hose unit T having one end detachably connected to the coupling 12 and the other end side as a rotation output side. A flexible hose unit T in which a flexible shaft 54 that can be bent and rotated about an axis is inserted into a flexible hose 52 that can be freely bent, and the coupling 12 and the flexible shaft 54 are detachable. A rotation transmission member that is fitted to the receiving portions 24 and 72 of the coupling 12 and the flexible shaft 54 and transmits the rotation input from the coupling 12 to the rotation output to the flexible shaft 54, Rotation transmission that breaks and interrupts rotation transmission when excessive rotational load from With product 80, and a protective device 10 of the flexible hose unit with. The coupling 12 is directly connected to the rotation input shaft 14 and functions as a tip portion of the rotation input shaft. The coupling and the flexible hose that protects and guides the flexible shaft are connected in the axial direction so as to have the same axial center and to freely rotate around the axis. The rotation input from the coupling is applied to the flexible shaft via the rotation transmission member, and is rotated from the flexible shaft to the rotation output side that is the tip side. When an excessive rotational load is applied to the rotation transmitting member, the rotation transmitting member breaks the main body portion to block the rotation transmission and protect the entire flexible hose unit. The material of the rotation transmitting member can be formed of metal, light metal, alloy, plastic, ceramic, or the like. By forming a concave part recessed inward from the outer peripheral surface, the overload breaking force set when a torsional rotational load is applied around the axis is surely applied to the concave part, and the fracture response to the set force is ensured Can be done.

At that time, the receiving portions 24 and 72 of the coupling 12 and the flexible shaft 54 are received from the receiving holes 22 and 70 having the openings 23 and 68 on the opposite wall side in a state where the coupling 12 and the flexible shaft 54 are connected. It is good to be.

Further, the rotation transmitting member 80 is detachably fitted to the receiving portions 24 and 72, and receives the rotation input from the coupling 12, so that the coupling 12, the rotation transmitting member 80, and the flexible shaft 54 rotate integrally. It is good to connect with an integral rotation engagement structure.

The rotation transmitting member 80 is preferably made of a rod-like body and has a concave portion 86 for setting an overload breaking force that is recessed from the outer peripheral surface thereof.

Further, the concave portion 86 is more preferably a groove 88 formed around the rotation transmitting member 80.

  Further, the concave portion 86 is located at substantially the same position as the opposed center line at the end of the coupling 12 and the flexible shaft 54 in the state where the coupling 12 and the flexible shaft 54 are coupled in close proximity or in close contact with each other. It is good to be arranged.

  According to the protection device for a flexible hose unit of the present invention, there are a coupling connected to a rotation input shaft, a flexible hose unit that is detachably connected to the coupling and has the other end side as a rotation output side, and is bent. A flexible hose unit that has a flexible shaft that can be bent and rotated about its axis, and a flexible hose that can be freely attached to and detached from the coupling and the flexible shaft. Rotation transmission member that fits into the receiving part and transmits the rotational input from the coupling to the rotational output to the flexible shaft, and breaks when excessive rotational load is applied from the flexible shaft side to interrupt the rotational transmission And a member with a simple structure. The hose can be swung and prevented from vibrating due to overload when using the kibble hose unit, and it can be handled safely. In addition, the entire flexible hose unit cannot be used and replacement is indispensable. It is possible to keep the cost low by exchanging only the transmission member, and it is possible to continue the output side operation stably.

In addition, since each receiving portion of the coupling and the flexible shaft is composed of a receiving hole having an opening on the opposite wall side in a state where the coupling and the flexible shaft are connected, the coupling and the flexible shaft are attached and detached. The rotation transmitting member can be attached to the part, and the state of the rotation transmitting member can be confirmed at the same time when the apparatus is used or inspected at the time of management work, etc., and convenience in use and management can be maintained.

In addition, the rotation transmission member has an integral rotation engagement structure so that the coupling, the rotation transmission member, and the flexible shaft rotate integrally with each receiving portion so as to be detachably fitted to each receiving portion and receiving a rotation input from the coupling. Since it is a connected structure, for example, the rotation transmission member is formed of a rigid body, and the rotation input from the coupling is directly transmitted to the flexible shaft, and a simple method of forming a concave portion or the like in the rotation transmission member The overload fracture setting of the rotation transmission member can be performed.

In addition, since the rotation transmission member is composed of a rod-like body and has a concave portion for setting the overload breaking force that is recessed from the outer peripheral surface thereof, the overload fracture setting of the rotation transmission member can be performed with a simple configuration, It is possible to reliably perform the fracture response to the load breaking force setting.

Further, since the concave portion is a groove formed in the circumferential shape of the rotation transmission member, the rotation transmission member can be set to an overload breakage with a simple structure, and a breakage response to the overload breakage force setting can be made. It can be done reliably.

  In addition, the concave portion is arranged at substantially the same position as the opposed center line of the end portions or the vicinity of the coupling axis line in a state where the coupling and the flexible shaft are connected in close proximity or in close contact with each other. Therefore, the rotation transmission member can be attached to the detachable part of the coupling and the flexible shaft, and the state of the concave portion of the rotation transmission member can be confirmed at the same time when checking the start of use of the device or management work, Management convenience can be maintained.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. The same reference numerals are used for the same devices or members as those shown in the conventional description. The protection device for a flexible hose unit according to the present invention can be applied in a bendable transmission hose means for flexibly transmitting a rotational input using a bendable flexible hose and a flexible shaft in agriculture, industrial fields, and other industrial fields. However, in this embodiment, the example applied to the chemical | medical solution mixer as one embodiment is shown.

  1 to 8 show a first embodiment of the present invention. 1 and 2, the protection device 10 for a flexible hose unit according to this embodiment includes a coupling 12, a flexible hose unit 30, and a rotation transmission member 80.

  The coupling 12 is partially or one end connected to a rotary input shaft 14 connected to a rotary device that generates a rotational force by a prime mover such as a pump, an engine, a motor, or a combination thereof, and the other part or the other end is flexible. A shaft coupling means to be connected to the hose unit 30. In the embodiment, one end side is a bottomed cylindrical body 16 and the other end side is a central portion of the bottom portion, and a shaft body 18 having a smaller diameter than the cylindrical body is separated in the axial direction of the cylindrical body. It is composed of a metal connector integrally projecting in the direction. In the embodiment, the coupling is formed by iron casting, and is fixed by a fixing member 20 such as a screw in a state where one end of the rotary input shaft 14 is inserted into the inner hollow portion of the cylindrical body 16. Rotate integrally with the rotation of. A coupling shaft 18 protruding from the bottom of the bottomed cylindrical body 16 has a predetermined length as a shaft having a circular cross section in the longitudinal direction of the rotary input shaft 14 from the bottom side of the cylindrical body in the height direction of the cylinder and away from the cylinder. Although projecting, a first receiving hole 22 is formed in the central portion of the shaft 18 so as to open the projecting end side. The receiving hole 22 is a receiving portion 24 of the coupling 12 that receives a rotation transmission member 80 (described later) when one end is inserted. As shown in FIG. 3, the receiving hole 22 is the center of the cylindrical shaft body 18. It is configured as a bottomed square hole with a core as the center. The edge portion of the receiving hole 22 of the shaft body 18 forms a tapered portion 28 that gradually widens from the square hole main body portion 26 toward the opening 23, and a rotation transmission member 80 to be described later is attached and detached. It is easy. The receiving hole 22 is connected to the rotation transmitting member to be fitted and connected with a rotation preventing structure, and may be a triangular hole, a pentagonal shape, another polygonal shape, an irregularly shaped hole, or a cylindrical hole with a spline groove or the like. Moreover, if the retaining is provided, a hole penetrating to the input shaft coupling side may be used.

  In the present embodiment, the flexible hose unit T is connected to the coupling 12 via the joint fitting 30. The joint fitting 30 connects the coupling 12 connected to the rotary input shaft 14 and the flexible hose unit T to transmit the rotational force, and disconnects the protective hose portion arranged on the outermost surface from the input rotation to thereby remove the cup. It is a connection means that is fixedly connected to the ring. When gripping the hose part or placing it on the ground, etc., various operations and handling of the entire unit are performed so that the rotation of the coupling 12 is not transmitted to the hose part. Easy to use.

  In FIG. 2, the joint fitting 30 is formed of a substantially cylindrical body integrally formed with a large diameter portion 301, a small diameter portion 302, and a small stepped portion 303 formed from the large diameter portion to the small diameter portion. A large-diameter portion 301 of the joint fitting 30 is externally mounted on the shaft body 18 via a bearing 32. That is, the shaft 18 is fitted and fixed in the inner ring hole of the bearing 32, and the inner wall of the joint fitting 30 is tightly fixed to the outer ring. The axial movement of the shaft body 18 or the joint fitting 30 of the bearing 32 is restricted by a width movement restricting member such as a snap ring (not shown). Therefore, the coupling fitting 30 is temporarily supported around the shaft body 18 of the coupling 12 so as to be rotatable. Actually, since the operator often holds or places the flexible hose unit side, the coupling 12 which is a connecting portion with the input shaft rotates when viewed from the outside. In a state where the large-diameter portion 301 of the joint fitting 30 is externally fitted to the shaft body 18, the distal end side of the shaft body 18 is projected to the flexible hose unit side with respect to the race width of the bearing 32, and the opening 23 of the receiving hole 22 is flexible. It faces the hose unit side. Furthermore, a stopper pin 36 having an enlarged head is attached to a part of the outer periphery of the joint fitting 30 via an attachment frame 34, and the lower end of the stopper pin 36 is inserted into a pin hole 38 drilled in the outer circumference of the joint fitting 30. The part is always installed in a state of being biased by the spring 40 in the central axis direction of the joint fitting 30. Normally, the lower end of the stopper pin 36 is arranged so as to protrude slightly inward from the inner wall of the joint fitting, and the stopper pin 36 is pulled against the spring force and retracted from the hollow hole of the joint fitting 30. In this state, the connecting member on the flexible hose unit side is inserted, and then the pulling force on the stopper pin 36 is released, and the tip of the pin is protruded and returned to connect to the connecting member on the flexible hose unit side. The end of the joint fitting 30 that is not connected to the coupling 12 is open (30a), and is connected and connected by receiving one end of the connection fitting 56 of the flexible hose unit.

  The flexible hose unit T is a flexible rotating shaft unit in which one end is detachably connected to the coupling 12 and rotational input from the coupling is transmitted by a flexible rotating shaft and the other end is connected to the rotating output side. In the embodiment, the flexible hose unit T includes a flexible hose 52 that can be bent, and a flexible shaft 54 that is freely inserted into the flexible hose 52 so as to be rotatable about its axis.

  The flexible hose 52 is a means for supporting and protecting the flexible shaft 54 that supports the flexible shaft 54 that can be freely bent and rotatably, and protects the flexible shaft 54 from the outside. In the embodiment, the flexible hose 52 is composed of a cylindrical hose in which a plurality of reinforcing synthetic fibers or metal fibers are laminated and integrated on a pressure-resistant synthetic rubber that can be bent in a direction intersecting the axial direction, and one end side of the hose is formed. While being connected and fixed to the joint fitting 30, the other end side is extended and connected to, for example, the stirring device R shown in FIGS. On both ends of the flexible hose 52, connecting fittings 56 and 57 having the same outer diameter as the hose 52 are connected and fixed by a fixing member 58 such as a fastening band. The connecting fitting 56 on the side connected to the joint fitting 30 is formed in a stepped cylindrical shape having an opening 62 facing the opening 30a of the joint fitting 30, and is integrally connected to the large diameter tube 60 and the large diameter tube. And a small-diameter cylinder 61. The small-diameter cylinder 61 of the connection fitting 56 has a tip that extends to the rotational output side, and the large-diameter cylinder 60 has an end that faces the opening 30 a of the joint fitting 30. The small diameter cylinder 61 is inserted and fitted into the hollow of the flexible hose 52 from one end side and is fixed by a fixing member 58. At that time, the stepped wall of the connection fitting 56 is fixedly connected in a state where the stepped wall is in close contact with the end face of the flexible hose 52. The cylinder hole in the small diameter cylinder 61 communicates with the cylinder hole of the large diameter cylinder 60 concentrically. The hollow interior of the large-diameter cylinder 60 also has a stepped hole shape in which a large-diameter hole portion and a small-diameter hole portion are connected via a small step wall 605. In a state where the small diameter portion 302 is fitted in the flexible hose 52, the connection fitting 56 is connected and fixed to one end side of the flexible hose 52 via the fixing member 58. A hole 64 for receiving the stopper pin 36 on the joint metal fitting 30 side is provided at a position near the opening end of the large-diameter cylinder 60.

The flexible shaft 54 is a flexible shaft transmission means that is connected at one end to the rotary input shaft 14 and transmits the rotary input in a rotatable and bendable manner, and is connected to the coupling 12 that connects one end side to the rotary input shaft 14. The other end side is the rotation output side. The one end side of the flexible shaft 54 and the rotation input shaft 14 are detachably connected via a rotation transmission member 80 as will be described later, and the rotation transmission member mounting portion as the detachable connection portion supports the shaft 54. In addition, it is set at or near the attaching / detaching portion of the protective flexible hose 52 and the coupling 12 that is rotatably connected to the rotary input shaft 14.

As the flexible shaft 54, a known shaft that is configured by winding a metal strand around a core steel wire around a plurality of belt-shaped layers and maintaining high flexibility and rotation about an axis can be adopted. Grease or the like is injected into the metal wire to improve the movement of the flexible shaft 54 itself or the flexible hose 52 and the internal flexible shaft 54 to reduce rotational resistance and heat generation, and maintain the handling of the hose from the outside. To do.

In FIG. 2, a rod-shaped adapter member 66 is extended at the end of the flexible shaft 54 in the longitudinal direction of the flexible shaft 54, with one end facing the tip of the shaft 18 of the coupling 12. Are connected and fixed. In the embodiment, the adapter member 66 is formed in a cylindrical shape, and includes a second receiving hole 70 having a depth direction in the direction of the shaft 54 having an opening 68 on the end face facing the shaft body 18. The second receiving hole 70 is a receiving portion 72 on the flexible shaft side that receives this when one end side of the rotation transmitting member 80 is fitted. As shown in FIG. 3, the second receiving hole 70 corresponds to the cylindrical shaft body 18. It is formed as a bottomed square hole having the same depth and size as the bottomed square hole. A washer 74 is engaged with the flexible shaft 54 and is disposed on the base side of the adapter member 66, and as shown in FIG. 7, the base end of the adapter member 66 and the perforated bottom wall of the small-diameter tube 61. 76 is interposed.

In the present invention, one characteristic is that a rotation transmission member 80 is provided on one end side of the coupling 12 and the flexible shaft 54 so as to detachably fit and connect one end side thereof. A part of the rotation transmitting member 80 is simultaneously fitted to the receiving portions 24 and 72 of the coupling 12 and the flexible shaft 54 to transmit the rotation input from the coupling 12 to the rotation output to the flexible shaft 54. It is a rotation transmission means, and in particular in this embodiment, this rotation transmission member has a transmission interruption function at the time of overload. The rotation transmitting member 80 can be basically a rod-shaped body or a cylindrical body structure having rigidity, but any external shape and internal structure can be used as long as the rotation transmitting member 80 can be fitted to both the receiving portions 24 and 72 and rotate together. Can be set. That is, the rotation transmitting member 80 is detachably fitted to the receiving portions 24 and 72 and receives the rotation input from the coupling 12 so that the coupling 12, the rotation transmitting member 80, and the flexible shaft 54 rotate integrally. In this manner, the coupling 12 and the flexible shaft 54 are connected to each other with an integral rotational engagement structure.

That is, in this embodiment, as shown in FIG. 5, the rotation transmitting member 80 is formed of a metal square bar member that is a slightly short metal square member that is substantially square in cross section and long in one direction, that is, a rigid body. In the embodiment, for example, it is made of brass from the viewpoint of workability. The rotation transmission member 80 breaks the main body portion at the time of excessive rotation load from the flexible shaft 54 side, and blocks rotation transmission from the input to the output side. The rotation transmitting member 80 is inserted into the first half body portion 82 that is inserted into and fitted into the first receiving hole 22 of the shaft body 18 of the coupling 12 and the second receiving hole 70 of the adapter member 66 of the flexible shaft 54. The second half part 84 and the concave part 86 are fitted to each other. In the embodiment, the first and second half portions 82 and 84 have rectangular parallelepiped shapes having substantially the same shape and size, and are slightly smaller than the first and second receiving holes 22 and 70, respectively. It is formed in a size that can be smoothly inserted into the hole.

  The concave part 86 of the rotation transmission member 80 of the metal bar member is a part that is broken when excessive rotational load is applied from the flexible shaft 54 side. It is a small part. That is, the rotation input around the axis from the rotation input shaft is directly transmitted from the coupling member 12 to the flexible shaft 54 via the rotation transmission member 80. At this time, the rotational torsional force is first received. The rotation transmitting member 80 applies a twisting rotational force to the flexible shaft 54 via the adapter member 66 by the rotation of the rotation transmitting member. Therefore, if a portion having a small cross-sectional diameter exists in a part of the rotation transmitting member that receives a large torsional rotational force, the load on the rotation from the flexible shaft 54 side increases due to high viscosity on the chemical liquid tank side or foreign object biting. In such a case, the torsional break occurs at the concave portion 86 which is inferior in strength. The concave portion 86 is a rod-shaped body in the present embodiment, and is an overload breaking force setting portion that is recessed from the outer peripheral surface thereof. The concave portion 86 is a portion having a small cross-sectional diameter of the rigid rotation transmission member 80, and various forms are conceivable. For example, concavities, regular and irregular scratches and grooves, lattice-shaped concave parts, continuous ones in the circumferential direction of the member, discontinuous ones, those formed at constant and irregular intervals, and other various concave part configurations are conceivable. . When a groove is formed in the circumferential shape to form a concave portion, the overload breaking force can be set steplessly.

Specifically, in the present embodiment, the concave portion 80 is formed by a groove 88 formed around the rotation transmitting member 80 as shown in FIG. The groove 88 is formed by, for example, grooving the longitudinal center portion of a square bar member with a lathe or the like, and the material is determined depending on the cross-sectional size of the remaining portion 90 after the groove 88 with respect to the cross-sectional sizes x and y of the square bar member. The breaking limit considered can be set to some extent, and thereby, the overload breaking force can be set according to the specific configuration and usage of the output device on the output side.

In FIG. 7, the rotation transmission member mounting portion as the detachable connecting portion includes a flexible hose 52 for supporting and protecting the shaft 54, and the coupling 12 that is rotatably connected to the rotary input shaft 14. In this embodiment, the concave portion 86 is further connected on the connecting axis 100 in a state where the coupling 12 and the flexible shaft 54 are connected in close proximity or in close contact with each other. They are disposed at substantially the same position as the center line 150 at their opposite ends or in the vicinity thereof. As a result, the position where the concave portion 86 of the rotation transmitting member 80 is formed is set at a portion close to the contact between the coupling 12 and the flexible shaft 54 or the facing position, and at the end of the shaft body 18 as shown in FIG. By forming the taper portion 28 and the like, the rotation transmitting member reliably breaks at the time of overload in the overload breaking force setting portion, that is, the concave portion, and the rotation force transmission is interrupted.

Next, the operation of the protection device 10 for the flexible hose unit of the embodiment will be described with reference to the drawings. A stirrer R connected with a flexible hose unit T is installed in the drug tank N of FIG. 10, and the sprayer S connected to the suction hose 92 with the suction part disposed in the chemical solution is driven by the rotational driving force from the prime mover U. It is driven and the chemical solution is sprayed from the nozzle 96 of the spray tube 94 onto the plant cultivation area or the like. The rotary input shaft 14 connected to the crank arm of the sprayer S is connected to the flexible hose unit T via the coupling 12 and the joint fitting 30, and the rotary blades of the stirring device R on the tip side of the unit T are driven to rotate.

The coupling 12 connected to the rotary input shaft 14 is rotated in the connected state in which the respective parts are assembled in the state of FIGS. 7 and 1 from the state of FIG. The rotation around the axis is not transmitted by 32, and only the flexible shaft 54 in the hose 52 rotates around the axis together with the coupling 12. In FIG. 7, the rotational force of the rotary input shaft 14 is transmitted in the order of the coupling 12, the rotation transmission member 80, the joint fitting 30, and the flexible shaft 54. At this time, a large resistance to rotation occurs due to external factors such as the stirring device R and the flexible hose unit T, or an external operation, and exceeds the strength set by the overload breaking force setting unit for the rotation transmission member 80. When a torsional rotational load is applied, it breaks at, for example, the concave portion 86 to interrupt transmission of rotational input. As a result, in the flexible hose unit T, overheating, the entire hose is violated, and further, the entire hose is prevented from being damaged, and the safety of the workplace can be ensured, and further the replacement cost of the equipment can be prevented.

FIG. 9 shows another example of the rotation transmission member 80. In this embodiment, the positioning member 120 is fitted in a groove 88 as a concave portion provided in the center of the rotation transmitting member. The positioning member 120 is positioned at the center or substantially the center position of the facing portion or the facing portion between the flexible shaft 54 side through the joint fitting 30 and the rotation input shaft 14 side through the coupling 12. In the embodiment, for example, an elastic ring member such as rubber is externally fitted in the groove. Breaking operation by setting in the overload breaking force setting unit and arrangement positioning regardless of the hole depths of the receiving holes 22 and 70 of the joint fitting and the coupling shaft can be realized.

The protective device for the flexible hose unit of the present invention described above is not limited to the above-described embodiment, and may be modified arbitrarily without departing from the essence of the invention described in the claims. Good.

  The protective device for the flexible hose unit of the present invention is not only a chemical solution mixer, but also a transmission mechanism that performs flexible shaft rotation transmission between the rotation input side and the rotation output side in a sprayer for agricultural chemicals, a mower, and other industrial equipment. It is possible to apply in general.

1 is a partially omitted external view of a protection device for a flexible hose unit according to a first embodiment of the present invention. 1 is an exploded longitudinal sectional view of the apparatus. FIG. 3 is a view taken along line AA in a state where a cross section is not shown in FIG. 2. It is a BB line arrow directional view in the state where a section is not taken in FIG. It is a perspective view of a rotation transmission member. It is sectional drawing of the groove part of FIG. It is a longitudinal cross-sectional view of FIG. It is the longitudinal cross-sectional explanatory drawing which decomposed | disassembled and shown the stirring apparatus of the chemical | medical agent sprayer to which the apparatus of FIG. 1 is applied, and the protection apparatus of the flexible hose unit of this embodiment. It is a perspective explanatory view of other embodiments of a rotation transmission member. It is explanatory drawing of the usage example structure of the chemical | medical agent sprayer which served as embodiment structure description of this application.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Protection apparatus of flexible hose unit 12 Coupling 14 Rotation input shaft 18 Shaft body 22 First receiving hole 24 Receiving part 30 Joint metal fitting 52 Flexible hose 54 Flexible shaft 56 Connecting metal fitting 66 Adapter member 70 Second receiving hole 72 Receiving part 80 Rotation Transmission member 86 Concave portion 100 Connection axis 150 Opposed center line T Flexible hose unit

Claims (6)

A coupling coupled to the rotary input shaft;
A flexible hose unit that is detachably connected to the coupling and has a rotation output side on the other end side, a flexible hose unit in which a flexible shaft that can be bent and rotated around an axis is inserted into a flexible hose that can be bent, and
The coupling and the flexible shaft are detachable, and a part of the coupling is fitted to the receiving portions of the coupling and the flexible shaft at the same time to transmit the rotational input from the coupling to the rotational output to the flexible shaft. A protective device for a flexible hose unit, comprising: a rotational transmission member that is broken when an excessive rotational load is applied from the flexible shaft side and interrupts the rotational transmission. 2. The protection device for a flexible hose unit according to claim 1, wherein each receiving portion of the coupling and the flexible shaft includes a receiving hole having an opening on the opposite wall side in a state where the coupling and the flexible shaft are connected. The rotation transmitting member is detachably fitted to each receiving portion and coupled with an integral rotation engagement structure so that the coupling, the rotation transmitting member, and the flexible shaft rotate integrally when receiving a rotation input from the coupling. 3. The protection device for a flexible hose unit according to claim 1, wherein the protection device is a flexible hose unit. 4. The protection device for a flexible hose unit according to claim 1, wherein the rotation transmitting member is formed of a rod-like body and has a concave portion for setting an overload breaking force that is recessed from an outer peripheral surface thereof. 5. The protective device for a flexible hose unit according to claim 4, wherein the concave portion is a groove formed in a circumferential shape of the rotation transmitting member. The concave portion is arranged at a position that is substantially the same as or close to the opposing center line of the end portions on the connection axis in a state where the coupling and the flexible shaft are connected in close proximity or in close contact with each other. 6. The protective device for a flexible hose unit according to claim 1, wherein the protective device is a flexible hose unit.

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