JP4879714B2 - Protective tube insertion machine - Google Patents

Description

  The present invention relates to a protective tube insertion machine for inserting a protective tube, which is protected by covering the outer periphery of an electric wire installed on a power pole or the like, into the electric wire.

  When working in the vicinity of electric wires installed on power poles, to prevent workers or work equipment from touching the electric wires for safety, and to protect electric wires close to trees, etc. The outer periphery of the electric wire is covered with a protective tube made of an insulating material.

  FIG. 9 is an external perspective view of the connected protective tubes.

  The main body portion 32, the female fitting portion 33, and the male fitting portion 34 constituting the protective tube 31 shown in this figure are formed using an insulating material having elasticity and flexibility. And as shown by the phantom line, these have a diameter that can accommodate the electric wire 30 inside, and a slit-like opening 37 that extends in a straight line in the longitudinal direction is formed on the upper side surface of the main body 32. Is formed. Thereby, the electric wire 30 can be covered by opening this slit-shaped opening part 37, accommodating the electric wire 30 inside, and leaving it closed by the restoring force based on the elasticity which the protective tube 31 has. Here, a pair of dorsal fin portions 39 extending in parallel to the outer side in the radial direction of the cylinder are formed from opposite end edges that form the slit-shaped opening 37.

  Further, as shown in this figure, a male fitting portion 34 is formed at one end of the protective tube 31 in the longitudinal direction, and another protective tube 31 having the male fitting portion 34 is formed at the other end. And a female fitting portion 33 that can be connected to each other. Each of the protective tubes 31 to be connected is set to a predetermined length, and a plurality of the male and female fitting portions 33 and 34 are connected to cover the long electric wire 30.

  Here, the male fitting portion 34 has a diameter larger than that of the main body portion 32. The female fitting portion 33 is formed with a housing portion 36 that can accommodate the male fitting portion 34 during fitting and can be engaged inside. Thus, the accommodating portion 36 of the female fitting portion 33 has a larger diameter than the male fitting portion 34.

  Normally, when the protective tube 31 as described above is attached to the electric wire 30, first the first protective tube 31 is inserted into the electric wire 30, and then the tip of the second protective tube 31 is inserted into the electric wire 30. In a state of being inserted into the electric wire 30, the two protective tubes 31 are connected to each other by male and female fitting portions 33 and 34. Then, by repeating such an operation, a plurality of protective tubes are inserted into the electric wire. Next, an apparatus for inserting the protective tube 31 into the electric wire while being connected in this way will be described.

  FIG. 10 is a plan view of a conventional protective tube insertion device.

  As shown in FIG. 10, the protective tube insertion device 40 includes a pair of rubber rollers 41a and 41b, and these rubber rollers 41a and 41b are arranged to face each other so that the respective rotation shafts 42a and 42b are parallel to each other. . The protective tube 31 for covering the electric wire is disposed between the rubber rollers 41a and 41b so that the longitudinal direction thereof is substantially perpendicular to the directions of the rotation shafts 42a and 42b of the rubber rollers 41a and 41b.

  In this way, the protective tube 31 is sandwiched by the pair of rubber rollers 41a and 41b from the opposite side surfaces. Then, when the pair of rubber rollers 41a and 41b rotate in the direction of the arrow in the figure, the protective tube 31 is sent out in the direction of the arrow B, that is, the direction of the electric wire to be covered.

  The rotational driving forces of the rubber rollers 41a and 41b are transmitted through the drive gears 43a and 43b and the driven gears 44a and 44b, respectively. Further, the rubber rollers 41a and 41b are supported by the rotation shafts 42c and 42d of the driven gears 44a and 44b, and the swing arms 45a and 45b that can swing in a plane perpendicular to the rotation shafts 42a and 42b of the rubber rollers 41a and 41b. Is supported by Further, the tips of the swing arms 45a and 45b are connected by a spring 46 that biases the rubber rollers 41a and 41b in a direction in which the rubber rollers 41a and 41b approach each other, that is, in a direction to sandwich the protective tube 31.

  Therefore, it can be sent in a state in which the protective tube 31 is held by a predetermined urging force set by the spring 46, and also against a change in diameter when the male and female fitting portions 33, 34, etc. pass. As the spring 46 expands and contracts, the distance between the pair of rubber rollers 41a and 41b can be followed.

Such a protective tube insertion device is described in Patent Document 1, for example.
Japanese Patent Laid-Open No. 8-149641

  However, in the conventional protective tube insertion device 40, since the rubber rollers 41a and 41b are always in contact with the protective tube 31 in a rotating state, it is difficult to obtain a sufficient frictional force therebetween. For this reason, the force which clamps the protection pipe | tube 31 with the rubber rollers 41a and 41b must be set large. Furthermore, since the protective tube 31 is formed with the slit-shaped opening 37 in the longitudinal direction as described above, it may be easily deformed by flexibility. Thereby, in order to support the protective tube 31 stably, there may be a case where a clamping force enough to cause a slight deformation is required.

  Accordingly, in order to extend the protective tube 31 while applying such a large clamping force, a high-power drive source is an essential component, and usually a large-scale drive device using a hydraulic device or the like is employed. Therefore, the installation is not easy and the cost is increased.

  Further, since the protection tube 31 is extended while being deformed, and the deformed protection tube 31 is attached to the electric wire, although the constituent material has elasticity, the use environment changes such as use at a low temperature. In the case where some plasticity temporarily appears, if too much deformation occurs, there may be a case where the attachment to the electric wire cannot be performed stably.

  Furthermore, if this clamping force is set too large, a large frictional force is obtained by the strengthened clamping force for the body portion 32 having a substantially constant diameter, and the force that is fed out without slipping is protected. Although it is efficiently transmitted to the pipe 31, when the male and female fitting portions 33, 34 that connect the protective pipes 31 pass, the space between the opposing rubber rollers 41a, 41b is widened so that the protrusions are retracted. Operation becomes difficult.

  Here, in order to operate the retracting mechanism that widens the space between the rubber rollers while rolling the surface of the protruding portions such as the male and female fitting portions 33, 34, the radius acting on the rubber rollers 41a, 41b side from the surface of the protruding portion. It is necessary to efficiently obtain an outward frictional force.

  That is, if the biasing force of the spring 46 acting inward in the radial direction for sandwiching the protective tube 31 is set too large, the radially outward frictional force acting on the rubber rollers 41a and 41b from the protrusions is offset. As a result, the function of the retracting mechanism is impaired.

  Thus, if the clamping force is weak, slippage is likely to occur in the entire protective tube, and conversely, if the clamping force is too strong, it is not possible to follow the change in diameter, and slipping is likely to occur in the protruding portion. It is not easy to adjust the clamping force when a cylindrical body having protruding portions with different diameters, such as male and female fitting portions, is fed out.

  Also, in order to increase the friction force from the protruding part to the rubber roller that works radially outward of the protective tube, the pressing force at the contact between the rubber roller and the protruding part is set by increasing the force with which the protective tube is extended. However, in this case as well, a large driving device is required to obtain a large driving force as described above.

  Thus, a configuration for performing a stable feeding operation based on an appropriate clamping force regardless of a change in the diameter of a cylindrical body whose diameter is not constant, such as a protective tube, is based on, for example, human power. It is not easy to realize with a simple configuration that allows operation.

  The present invention solves the above-described problem, and stably feeds a cylindrical protective tube whose diameter is not constant with respect to the longitudinal direction, regardless of changes in the diameter. An object of the present invention is to provide a protective tube insertion machine using a simple configuration that can be used.

In order to achieve the above-mentioned object , the present invention comprises a guide rod arranged in an inserted state in the protective tube in order to forward the protective tube made of a substantially cylindrical tubular body incised by an axial slit, A pair of rollers that are disposed on both sides of the guide rod and that can rotate only in one direction and that sandwich a part of the protective tube between the guide rod and the pair of rollers are directed toward the guide rod. Two sets of front and rear feeding parts each comprising a biasing means for biasing, and a base that supports the pair of rollers and moves parallel to the axial direction of the guide rod, and front and rear of the two sets of feeding parts A drive mechanism that reciprocates back and forth so that the base is parallel to the axial direction of the guide rod and in opposite phases to each other, and when the front base moves forward, the pair of rollers on the front side is in a non-rotating state. In parallel with this, the rear base moves backward, the rear roller rotates and rolls on the protective pipe, while the rear base moves forward. When moving, the pair of rear rollers contact the protective tube in a non-rotating state and move it forward. In parallel, the front base moves backward, and the front roller rotates to rotate the protective tube. The roller is supported on the base via a swingable swinging arm, and the swinging arm is tilted forward from a direction perpendicular to the axial direction of the guide rod. The urging force by the urging means that contacts and separates from the guide rod is set to be substantially the same size on the forward movement side and the backward movement side of the roller, and at least of the outer surface of the roller, It is a surface on the rear side with respect to the feeding direction of the protective tube and is opposed to the protective tube. In response to pressure from the step portion of the protective tube projecting height which abuts the surface on the side, the roller is characterized in that it is set to a size retractable of.

  With this configuration, a part of the protective tube is sandwiched between the inner guide rod and the outer roller. Therefore, even if the protective tube has flexibility, the protective tube is greatly increased due to the presence of the slit. It is stably held without bending and breaking its shape. Further, since the rollers are arranged in a pair so as to sandwich the protective tube from both sides, the direction of the force from the roller to the protective tube coincides in a straight line or on the same plane, and the clamping state is further stabilized. When one of the bases moves forward, the protective tube is moved forward together with the non-rotating roller, so that the relative positional relationship between the protective tube and the roller is fixed, and the clamping state is stabilized. In the other base that moves backward in parallel with this, the roller rolls on the protective tube, so that the protective tube can smoothly move forward without interfering with the protective tube. Further, the two sets of feeding parts including the base and the roller reciprocate back and forth so as to be in opposite phases so that when one moves forward, the other moves backward. It is moved forward by either one of the feeding portions, and the feeding operation is continuously performed.

  Further, in the above configuration, the driving mechanism receives the rotational driving force from the outside at the input end, and obtains the two sets of feeding units based on the transmitted rotational driving force obtained through the power transmission mechanism that transmits the output to the output end. If the crank mechanism is configured to include two crank portions having a phase difference of 180 degrees from each other, and these two crank portions are respectively connected to one of the two sets of feeding portions. With a simple configuration, the two sets of feeding portions can be moved in opposite phases.

  Further, in each of the above configurations, if the guide rod includes a friction reduction means for reducing friction caused by sliding contact with the inner wall of the protective tube on each side surface facing the roller, Since the frictional force between the guide rod and the guide rod is reduced, the roller can sufficiently move forward with a protective tube even with a small biasing force.

  In each of the above configurations, the roller is supported by the base via a swingable swing arm, and the guide rod is tilted forward from a direction perpendicular to the axial direction of the guide rod. If the roller moves forward together with the base, the frictional force acting on the roller side from the contacting protective tube tends to swing the peristaltic arm to the guide rod side. Therefore, the holding state of the protective tube by the guide rod and the roller is stabilized. Further, when the roller moves backward together with the base, the frictional force acting on the roller side from the abutting protection tube generates a component force in a direction to move the peristaltic arm away from the guide rod side. Interference with the tube is further mitigated.

  Further, in each of the above configurations, the guide rod protrudes in an outer diameter direction from between the slits when the protective tube is inserted, and a guide plate that guides the slit of the protective tube to be fed is formed on a side surface. If it is a structure, the direction in which the slit of the protective tube was formed can be fixed, and the attachment to an electric wire will be stabilized.

  In addition, the roller is biased toward the guide rod side, a part of the tubular body is sandwiched between the guide rod and the roller, and a drive mechanism for reciprocating the base supporting the roller is provided. The structure in which the rotation of the roller is stopped when moving forward and the tubular body is extended so that the roller rolls on the tubular body when moving backward can be applied to the protective tube inserting machine that extends the protective tube. .

  According to the present invention, since the protective tube is moved forward by being sandwiched between the guide rod inserted and disposed inside the protective tube and the external roller, the protective tube having the slit is flexible. However, there is no significant deformation. As a result, the deformation of the protective tube is minimized, and the covering state of the electric wire or the like becomes good. Further, since the protective tube is moved forward while being pressed by the non-rotating roller, the contact state with the roller is constant, and the protective tube is fed out stably. Since the roller that moves backward together with the base rolls on the protective tube and does not interfere with the protective tube, the efficiency of the forward movement is not impaired.

  Further, in the present invention, when the rollers are arranged so as to be paired with the guide rod interposed therebetween, the direction of the force applied from the roller to the protective tube becomes a straight line, so that the holding state of the protective tube is stabilized. Then, when two sets of feeding parts composed of the roller and the base are used and the two parts are reciprocated back and forth so that the phases are opposite to each other, the protective pipe is always used by one of the feeding parts. Since the is moved forward, the working efficiency can be improved.

  Hereinafter, an embodiment of a protective tube insertion machine according to the present invention will be described with reference to the drawings. The following description is a specific example of the present invention, and does not limit the scope of the claims. Moreover, the same code | symbol shall be used about the same part in each drawing.

  FIG. 1 is an external perspective view showing an example of use of a protective tube insertion machine according to an embodiment of the present invention.

  As shown in this figure, the protective tube insertion machine 1 according to this embodiment is attached from below the electric wire 30 installed on a utility pole or the like. The protective tube 31 is drawn out in the direction of arrow A so as to come into contact with the electric wire 30 at a shallow angle, and is attached to the outside of the electric wire 30 like the protective tube 31 indicated by a virtual line. Here, in this embodiment, the power for the feeding operation is transmitted through the operation rod 24 connected to the input unit 23 of the protective tube insertion machine 1 that receives a rotational driving force from the outside. Although not shown here, the operation rod 24 has a rotation transmission mechanism inside.

  Next, a mechanism for holding and guiding the feeding direction of the protective tube 31 with respect to the electric wire 30 in a fixed state will be described with reference to FIGS.

  2 is an enlarged perspective view of the protective tube inserting machine of FIG. 1, FIG. 3 is a plan view of the protective tube inserting machine of FIG. 1, FIG. 4 is a side view of the protective tube inserting machine of FIG. FIG. 5 is a front view of the protective tube insertion machine of FIG.

  As shown in these drawings, a guide rod 2 for guiding the protective tube 31 is arranged at the center of the protective tube insertion machine 1 according to this embodiment so as to extend in a substantially horizontal direction. At the time of use, the protective tube 31 is passed through the guide rod 2 so as to be in sliding contact with the internal space and fed toward the electric wire 30. Thus, the protective tube 31 is guided and supported by the guide rod 2 in this axial direction. The guide rod 2 includes a guide plate 3 that extends substantially vertically upward and extends in the longitudinal direction of the guide rod 2 and guides the pair of dorsal fin portions 39 of the protective tube 31. . In other words, the guide plate 3 guides the pair of dorsal fin portions 39 of the protective tube 31 so that they pass along both surfaces of the protective tube 31 so that the protective tube 31 rotates about its axis and does not twist. Is. In this embodiment, as shown in FIG. 1, the protective tube 31 is fed in the direction of the arrow A along the guide rod 2 and the guide plate 3 with each female fitting portion 33 at the head. It is done.

  A plurality of guide rollers 4 (friction reducing means) are provided on the side of the guide rod 2 for reducing friction with the inner surface of the protective tube 31 and smoothing the feeding. Each of the plurality of guide rollers 4 is freely rotatable, and is arranged on both side surfaces of the guide rod 2 so as to be arranged at equal intervals in the longitudinal direction. Further, the rotation axis direction of the plurality of guide rollers 4 is set to be a direction perpendicular to the longitudinal direction of the guide rod 2. The roller surfaces of the guide rollers 4 are arranged so that each part protrudes outward from the side surface of the guide rod 2. As a result, on the side of the guide rod 2 where the guide rollers 4 are arranged, the inner surface of the protective tube 31 abuts against the freely rotatable guide roller 4 and the protective tube 31 moves in the longitudinal direction. It becomes easy.

  Here, the guide plate 3 is integrally provided with a hook portion 5 on the front side in the direction indicated by the arrow A and a fastener 6 on the rear side. The protective tube insertion machine 1 is attached to the electric wire 30 at the two locations of the hook portion 5 and the fastener 6. Using such a configuration, when installing, most of the weight of the protective tube insertion machine 1 is obtained by first hooking only the hook portion 5 to the electric wire 30 installed horizontally as shown in FIG. Can be left on the electric wire 30 side, and in this state, the rear side can be lifted and fixed by the fastener 6. As shown in FIG. 5, the fastener 6 is configured to fasten and fix the electric wire 30 from the side by a screw receiving portion 6a and a fastening screw 6b. At the end, a remote operation ring 6c is formed so that it can be easily rotated and tightened using a remote control rod or the like with a tool attached to the tip. In this way, by arranging the hook portion 5 and the fastening tool 6, it is not necessary to perform an attachment operation in an unstable state while supporting the weight of the protection tube insertion machine 1 or a work for extending the protection tube. .

  Next, FIG. 4 shows the positional relationship between the electric wire 30 and the guide rod 2 as viewed from the side. That is, the electric wire 30 and the guide rod 2 are disposed so as to form an acute angle θ. Further, as described above, the direction of the guide plate 3 is set so that the back fin portion 39 of the protective tube 31 is positioned on the electric wire 30 side. In addition, on the front side of the guide plate 3 in the direction of arrow A, as shown in detail in FIGS. 2 and 3, there is provided a dorsal fin guiding portion 7 whose width in the lateral direction increases toward the front side. It has been. Thereby, when the protective tube 31 is sent in the direction of the arrow A, before the contact with the electric wire 30, first, the front of the dorsal fin portion 39 starts to spread by the dorsal fin guiding portion 7. Then, the pair of dorsal fin portions 39 abut on the electric wire 30 in a state where the gap extends to an interval close to the diameter of the electric wire 30. In this way, the pair of dorsal fin portions 39 in the closed state spreads to the thickness of the electric wire 30 due to the flexibility of the material, and the protective tube 31 can be smoothly guided and attached to the electric wire 30. It becomes possible. In this way, the other back fin portion 39 of the protective tube 31 further sent from the rear is similarly continuously opened at the contact position with respect to the electric wire 30. On the other hand, the other part of the protective tube 31 that has passed through the abutting position closes the dorsal fin portion 39 in an opened state due to its own elasticity after the electric wire 30 is accommodated therein. Therefore, if a plurality of protective tubes 31 are connected in advance in the male and female fitting portions 33 and 34, the protective tubes 31 are attached to the electric wire 30 smoothly and continuously.

  In this embodiment, the electric wire abutting portion 8 having a substantially semicircular cutout 8a formed on the front side according to the outer shape of the electric wire 30 is integrally provided with respect to the guide plate 3, and installed. In the state, this notch 8 a fits below the electric wire 30. As a result, the front side of the protective tube insertion machine 1 that is hooked by the hook portion 5 with respect to the electric wire 30 is held at a constant distance from the electric wire 30 by the notch 8a that abuts from below, and the guide plate 3 and the guide rod 2 are stabilized in such a manner that the electric wire 30 is always included in the plane including the guide rod 2 and the lateral movement is suppressed.

  Hereinafter, a configuration in which the protective tube 31 is extended in the direction of the arrow A, that is, toward the electric wire 30 will be described.

  As shown in FIG. 5, the guide plate 3 described above is integrally fixed to the upper end of a rectangular main frame 21a. A rectangular sub-frame 21b smaller than the main frame 21a is connected to the lower end side of the main frame 21a. A rail 10 is fixed to the upper surface of the lower end portion of the main frame 21a, which is a boundary with the sub-frame 21b, so as to be in a lower position and parallel to the guide rod 2. The rail 10 is formed with a slit-like opening 10a extending in the longitudinal direction on the upper side, and a flat cavity is provided therein. Then, guided portions 10b and 10c (not shown in the figure because the front guided portion 10b is in a hidden position) are slidably guided in the inside cavity of the rail 10 and provided on the lower end side. The front base 17a and the rear base 17b, which are spread out almost horizontally, are arranged above the rail 10 in the longitudinal direction. In other words, both end edges forming the opening 10a of the rail 10 function as a stopper for the guided portions 10b and 10c, and the front and rear bases 17a and 17b are reciprocated substantially horizontally along the rail 10 so as to reciprocate. Can be fixed.

  In this way, the front base 17a and the rear base 17b can slide back and forth with respect to the groove of the rail 10 independently. A pair of rubber rollers 18a to 18d are erected vertically above the front and rear bases 17a and 17b so as to sandwich the guide rod 2 from both sides, and below the front and rear bases 17a and 17b. Thus, drooping pieces 11a and 11b extending substantially vertically downward are formed. Since the structures provided above and below the front and rear bases 17a and 17b are integrally slid on the rail 10, the protective tube 31 is extended forward, so that the two sets of front and rear are almost the same. The configuration is a front feeding portion 9a and a rear feeding portion 9b, respectively.

  Here, in the front / rear feeding parts 9a, 9b, the configuration on the upper side of the front / rear bases 17a, 17b is closely related to the longitudinal movement of the front / rear feeding parts 9a, 9b on the rail 10. Therefore, first, the configuration of the operation part that applies a horizontal force to the hanging pieces 11a and 11b below the front and rear bases 17a and 17b to move the front and rear feeding parts 9a and 9b back and forth will be described.

  As shown in FIG. 5, the operation unit 12 (drive mechanism) is arranged in the sub-frame 21b. The operation unit 12 is shown in detail as an exploded perspective view in FIG. As shown in FIG. 6, the operation unit 12 is provided with a left crank 14b and a right crank 14a on both the left and right sides through a central crank body 22 having a crank lever having a phase difference of 180 degrees formed at both ends. Have. The crankshafts 13a and 13b on the straight lines of the left and right cranks 14b and 14a are arranged in the horizontal direction (in FIG. 4, the direction perpendicular to the paper surface). That is, the left crank 14b is configured by a crank link 15b pivoted between the left crank lever 22b pivotally supported on the crankshaft 13a on the left side wall of the subframe 21b and the central crank body 22a. Further, the right crank 14a is constituted by a crank link 15a pivoted between a right crank lever 22c pivotally supported by a crankshaft 13b on the right side wall of the sub-frame 21b and a central crank body 22a. Yes. The crank links 15a and 15b are linked to hanging pieces 11a and 11b hanging from the front and rear bases 17a and 17b of the front and rear feeding portions 9a and 9b, respectively.

  Since the hanging pieces 11a and 11b are integrated with the front and rear bases 17a and 17b as described above, the connecting positions of the lower ends of the crank links 15a and 15b are on a horizontal track parallel to the rail 10. Moving. Furthermore, in this embodiment, this horizontal track is set to coincide with the height position of the crankshafts 13a, 13b. Therefore, the horizontal movement obtained by converting from the left crank 14b and the right crank 14a having a phase difference of 180 degrees is such that when one moves forward, the other moves backward, the crankshaft 13a, The reciprocating back and forth motion is reversed in phase and substantially symmetrical with respect to 13b.

  Here, in this embodiment, a power transmission mechanism 26 is provided to transmit power from the outside to the crankshaft 13b of the operation unit 12 as described above. The power transmission mechanism 26 includes an umbrella gear 16b having a substantially horizontal rotation shaft connected to the crankshaft 13b, and an umbrella gear 16a combined with the umbrella gear 16b. The rotating shaft of the umbrella gear 16a is connected to an input shaft 25 for receiving a rotational driving force from the outside. As a result, a remote control rod or the like having a mechanism for transmitting the rotational force can be connected to the inside, so that it is possible to serve both for supporting the protective tube insertion machine 1 and for applying the rotational force, so that the rotational force is efficient. If it is configured so that it can be transmitted to, it can be operated by human power.

  Next, a detailed configuration of the feeding units 9a and 9b will be described. Here, since the two feeding portions 9a and 9b have the same configuration, only one feeding portion 9a will be described.

  As described above, the feeding portion 9a includes the pair of rubber rollers 18a and 18b extending vertically upward so as to sandwich the guide rod 2 therebetween. The rubber rollers 18a and 18b are configured to be allowed to rotate only in the direction in which the contact side with respect to the protective tube 31 moves forward when in contact with the protective tube 31 during use. Specifically, as shown in FIG. 2, in a plan view, the rubber roller 18a can rotate only in the clockwise direction, and the rubber roller 18b can rotate only in the counterclockwise direction. In general, a ratchet mechanism or the like is employed as the rotation mechanism.

  Here, these rubber rollers 18a and 18b are respectively placed on a pair of swing arms 20a and 20b that swing horizontally. The swing arms 20a and 20b are connected to each other by a spring 19a so that the rubber rollers 18a and 18b placed on the guide arms 2 are in contact with the guide rod 2 in a state where the swing arms 20a and 20b are inclined forward by a predetermined angle α. Is biased inward.

  Next, the drawing operation of the protective tube 31 performed by operating the respective hanging pieces 11a and 11b so that the front and rear feeding portions 9a and 9b having the above-described configuration perform reciprocal movement in opposite phases is illustrated. This will be described with reference to FIGS.

  FIG. 7 is a schematic diagram showing the feeding operation of the main part of the protective tube by the protective pipe inserting machine of FIG. 1, and FIG. 8 shows the feeding operation of the male and female fitting parts of the protective pipe by the protective pipe inserting machine of FIG. It is a schematic diagram. In these drawings, components that are not necessary for explanation of the operation are omitted.

  FIG. 7A shows a state in which the feeding portions 9a and 9b are moving away from each other due to the horizontal movement obtained by the crank links 15a and 15b extending from the left and right cranks 14a and 14b of the operation portion 12. Yes. Here, as described above, the rubber rollers 18a to 18d are allowed to rotate only in the direction in which the side in contact with the protective tube 31 moves forward, so that the rubber rollers 18a to 18d move forward relative to the protective tube 31. The rubber rollers 18a and 18b of the portion 9a cannot rotate. Inside the protective tube 31, a plurality of guide rollers 4 are arranged in parallel in the longitudinal direction on the side surface of the guide rod 2 so as to face the rubber rollers 18a and 18b. In this way, in the pre-feeding portion 9a that moves forward, a part of the side wall of the protective tube 31 is held between the rubber rollers 18a and 18b that do not rotate and the guide roller 4 that freely rotates. Thus, when the rubber rollers 18a and 18b move forward, the protective tube 31 held between them is taken forward while being held between the rubber rollers 18a and 18b.

  On the other hand, the rubber rollers 18c and 18d of the feeding portion 9b that moves rearward relative to the protective tube 31 can rotate in the directions of arrows R1 and R2, respectively. Accordingly, the protective tube 31 rolls on the protective tube 31 with little interference with the protective tube 31 brought along with the rubber rollers 18a and 18b, and the forward movement of the protective tube 31 is not hindered.

  In this way, the protection tube 31 also moves forward with the movement of the front feeding portion 9a to the position that becomes the movable limit on the front side.

  Next, FIG. 7B shows a case where the phases of the left and right cranks advance from the state in which the crank links 15a and 15b extend horizontally in the front-rear direction, and each is pulled back to the inner side of the sub-frame 21b, that is, the feeding portion. 9a and 9b show a state where they are moving toward each other. Here, the relationship between the forward movement and the backward movement is opposite to that in the case of FIG. 7A, and the operation in which the rubber rollers 18c and 18d bring the protective tube 31 forward by the forward movement of the rear feeding portion 9b. The rubber rollers 18a and 18b of the portion 9a rotate without hindering (in the direction of arrows R3 and R4 in the drawing, the protective tube 31 is smoothly drawn forward.

  Next, the feeding operation of the protective tube 31 when the male and female fitting portions 33 and 34 pass through the movable regions of the front and rear feeding portions 9a and 9b will be described.

  FIG. 8A shows a state in which the front and rear feeding portions 9a and 9b are moving in directions away from each other. In this case, as in the case of FIG. 7A, the rear rubber rollers 18c and 18d can rotate, and the front rubber rollers 18a and 18b cannot rotate. Here, the difference from the state of FIG. 7A is that the male and female fitting portions 33 and 34 enter the movable region of the rear feeding portion 9b. Here, since the rubber rollers 18c and 18d in this embodiment are placed on the swing arms 20c and 20d that can swing in a plane parallel to the surface including the base 17b of the rear-feeding portion 9b, the main body portion 32 is provided. When the male and female fitting portions 33 and 34 having larger diameters pass, the outer arms can be retracted outward by the swinging of the swinging arms 20c and 20d. At this time, since the rubber rollers 18c and 18d can roll with respect to the protective tube 31, the male and female fitting portions 33 and 34 are allowed to pass smoothly by a combination of the retracting operation and the rotating operation. Therefore, even if there are portions having different diameters such as the male and female fitting portions 33 and 34, the feeding portion 9b that is not performing the feeding operation flexibly follows the change in diameter, and the feeding operation of the other feeding portion 9a is performed. Can be prevented.

  In addition, the length and the rotatable angle of the swing arms 20a to 20d are set in consideration of the diameters of the male and female fitting portions 33 and 34 of the protective tube 31 to be applied.

  Similarly, in the state of FIG. 8B in which the front-rear relationship is switched, the protective tube 31 is supported and fixed by the feeding portion 9b on the rear side, and is sent forward. Here, as shown in this figure, the rubber rollers 18c and 18d on the rear side sandwich the female fitting portion 34 instead of the main body portion 32. However, the operation of sandwiching the rubber rollers 18c and 18d that do not rotate and feeding them forward is the same as the operation for the main body 32 shown in FIG. Therefore, although there is a difference in the clamping force based on the urging force of the spring 19b (not shown), even if it is a protruding part such as the accommodating part 36, it can be sent stably in the same way as the part having a uniform diameter. It is possible. The rubber rollers 18a and 18b of the front feeding portion 9a are just over the front end portions of the male and female fitting portions 33 and 34, but the rubber rollers 18a and 18b on this side are rotatable, and the swing arm 20 Can be retracted by rotating outward, so that the male and female fitting portions 33 and 34 can be smoothly passed through without hindering the feeding operation of the protective tube 31 by the rear feeding portion 9b.

  Here, the rubber roller 18 when the rotation is stopped and the protective tube 31 is fed forward by the frictional force of the abutting portion is protected based on the frictional force because the peristaltic arm 20 is inclined forward. A force that is pressed in the direction of sandwiching the tube 31 is generated. That is, the backward frictional force acting on the rubber roller 18 side that does not rotate from the protective tube 31 gives a rotational force that tries to swing the swing arm 20 in a direction to approach the protective tube 31 side. Thereby, the force by which the rubber roller 18 clamps the protective tube 31 is added, and the support and fixing state of the protective tube 31 by the rubber roller 18 is stabilized.

  On the other hand, with respect to the rubber roller 18 that moves relative to the protective tube 31 and rotates, the configuration in which the peristaltic arm 20 is tilted forward acts to generate a force for pushing away from the protective tube 31. That is, the protective tube 31 that moves relatively forward while rotating the rubber roller 18 gives a rotational force to swing the swing arm 20 in a direction away from the protective tube 31. Thereby, the force with which the rubber roller 18 clamps the protective tube 31 is reduced, and the retraction movement of the rubber roller 18 is facilitated.

  As described above, according to the configuration of this embodiment, when the protective tube 31 is supported and fixed and a sufficient clamping force is required, an additional clamping force can be obtained so as to assist the clamping force. On the contrary, when allowing the passage away from the protective tube 31, the clamping force can be reduced so as to assist the retreat.

  Accordingly, a stable clamping force can be obtained during feeding even when the force for clamping the protective tube 31 is not set so large, and when the protruding portion passes, the clamping force is weakened and the projection is smoothly formed. It can be avoided.

  Even when it is necessary to increase the clamping force, the force acting on the rubber roller 18 from the protruding portion of the protective tube 31 acts in a direction to relieve the clamping force, so that the allowable adjustment range is increased. The clamping force can be easily adjusted.

  In addition, as shown in the feeding operation diagrams of the protective tube 31 in FIGS. 7 and 8, when one of the two front and rear feeding portions 9a and 9b arranged in parallel is moving backward, the other is Move forward. That is, at any moment, any one of them always performs an operation of feeding the protective tube 31 forward, so that when viewed as a whole, the protective tube 31 is continuously and efficiently fed without waste. .

  In the above embodiment, the configuration using the hook portion and the tightening portion is shown as an example for attaching the protective tube insertion machine to the electric wire. However, any configuration that can be attached to the electric wire stably is shown. For example, the number and combination are not limited to this, and for example, the front and rear may be configured by a tightening portion.

  In the above-described embodiment, the configuration in which the dorsal fin guiding portion for opening the dorsal fin portion is provided immediately before contacting the electric wire is shown as an example, but this may not be provided.

  Furthermore, in the above-described embodiment, the configuration in which the wire contact portion is provided below the hook portion and the guide rod is axially aligned with the wire is shown as an example. If the axial direction of the guide rod is stable, for example, by attaching the wire rod, the wire contact portion may be omitted.

  Furthermore, in the above-described embodiment, a configuration in which a plurality of guide rollers are arranged on the side of the guide rod has been shown as an example. However, the configuration is not limited to this, and a configuration that improves slippage between the inner wall of the protective tube and the guide rod. Any other configuration may be used.

  Further, in the above-described embodiment, the rubber roller that is a pair of the feeding portions is shown as an example of a configuration in which the rubber roller is opposed to the direction that is substantially perpendicular to the direction in which the guide rod extends in plan view. It doesn't have to be.

  Furthermore, in the above-described embodiment, a configuration using two sets of feeding portions is shown as an example, but one set may be used, or three or more sets may be used.

  Furthermore, in the above-described embodiment, a configuration using a guide plate for positioning the back fin portion of the protective tube has been shown as an example. However, as long as the back fin portion can be positioned, the plate may not be a plate-like member. I do not care.

  Furthermore, in the above embodiment, the guide rod has been shown as an example of a configuration having a substantially cylindrical shape, but other than the cylindrical shape as long as the axial direction of the protective tube can be stably fixed. It may be a rod-shaped body.

  Furthermore, in the above-described embodiment, power is transmitted from the outside via the umbrella gear from the power receiving portion, and the operation portion having two cranks having a phase difference of 180 degrees using the transmitted power. However, an example of a configuration in which two sets of feeding portions perform horizontal reciprocating motion in opposite phases is shown. However, as long as the feeding portion is configured to perform horizontal reciprocating motion in the opposite phase on the rail, other configurations may be used.

  Furthermore, in the above-described embodiment, the configuration in which the spring is used to apply the biasing force in the inner direction to the rubber roller that forms a pair in the feeding portion is shown as an example. Other configurations may be used, and the spring may be provided independently for each rubber roller.

  Furthermore, in the above-described embodiment, the configuration in which the feeding portion slides back and forth on one rail is shown as an example. However, the configuration is not limited to this, and the rail can be used as long as the feeding portion can move back and forth. Multiple guides may be provided, and other guide configurations may be used.

  Furthermore, in the above-described embodiment, the configuration in which the protective tube is extended by the rubber roller is shown as an example. However, any roller other than rubber can be used as long as sufficient frictional force that does not cause slippage with the protective tube can be obtained. It does not matter.

  When a cylindrical body such as a protective tube whose diameter changes with respect to the longitudinal direction is fed out, it is possible to prevent catching at a protruding portion having a large diameter, and to support and feed out the cylindrical body with a small clamping force. Since a simple configuration can be used, for example, it can be used in a protective tube insertion machine or the like that inserts a protective tube to be protected by covering the outer periphery of an electric wire installed on a utility pole or the like.

It is an external appearance perspective view of the protection pipe insertion machine which concerns on embodiment of this invention. It is an expansion perspective view of the protective tube insertion machine of FIG. It is a top view of the protective tube insertion machine of FIG. It is a side view of the protective tube insertion machine of FIG. It is a front view of the protective tube insertion machine of FIG. It is a disassembled perspective view of the operation part of the protective tube insertion machine of FIG. It is the schematic diagram which showed the feeding operation | movement of the main-body part of the protection pipe by the protection pipe insertion machine of FIG. It is the schematic diagram which showed the feeding operation | movement of the male-female fitting part of a protective tube by the protective tube insertion machine of FIG. It is an external appearance perspective view of the conventional protection tube connected. It is a top view of the conventional protective tube insertion apparatus.

Explanation of symbols

1 Guard tube insertion machine 2 Guide rod 3 Guide plate 4 Guide roller (friction reduction means)
9 Feeding section 10 Rail 11 Operating arm 12 Operating section (drive mechanism, crank mechanism)
17 Base 18 Rubber roller 19 Spring 20 Peristaltic arm 26 Power transmission mechanism α Predetermined angle

Claims (4)

A guide rod arranged in an inserted state in the protective tube to feed forward a protective tube made of a substantially cylindrical tubular body cut by an axial slit;
A pair of rollers that are disposed on both sides of the guide rod and that can rotate only in one direction and that sandwich a part of the protective tube between the guide rod and the pair of rollers are directed toward the guide rod. Two front and rear sets of feeding portions each comprising a biasing means for biasing and a base that supports the pair of rollers and moves parallel to the axial direction of the guide rod;
A drive mechanism for reciprocating the front and rear bases of the two sets of feeding portions in parallel to the axial direction of the guide rod and in opposite phases to each other;
When the front base moves forward, the pair of rollers on the front side contacts the protective tube in a non-rotating state to move it forward, and in parallel with this, the rear base moves backward, and the rear rollers While rotating and rolling over the protective tube,
When the rear base moves forward, the pair of rollers on the rear side contacts the protective tube in a non-rotating state to move it forward, and in parallel with this, the front base moves backward to move the front roller. Rotates and rolls over the protective tube ,
The roller is supported by the base via a swingable swinging arm, and the swinging arm is in contact with and separated from the guide rod in a state where the swinging arm is tilted forward from a direction perpendicular to the axial direction of the guide rod. And
The urging force by the urging means is set to be substantially the same size on the forward movement side and the backward movement side of the roller, and at least of the outer surface of the roller with respect to the feeding direction of the protective tube. The roller is set to a size that allows the roller to be retracted by receiving a pressure from the stepped portion of the protective tube with a protruding height that is in contact with the surface on the rear side and facing the protective tube. Protective tube insertion machine characterized by. The drive mechanism is a crank mechanism that drives the two sets of feeding portions based on the transmitted rotational drive force, which is obtained through a power transmission mechanism that receives a rotational drive force from the outside at the input end and transmits it to the output end. There,
Provided with two crank portions having a phase difference of 180 degrees from each other, inserting the two crank portions, Protective tube according to claim 1, wherein the respectively connected with either one of the two sets of feeding portion Machine. 3. The protective tube according to claim 1, wherein the guide rod is provided with friction reducing means for reducing friction caused by sliding contact with an inner wall of the protective tube on each side surface facing the roller. 4. Insertion machine. The guide rod is formed on a side surface of a guide plate that projects in an outer diameter direction from between the slits when the protective tube is inserted, and that guides the slits of the protective tube that is fed out. The protective tube insertion machine according to any one of claims 1 to 3 .

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