JP2018047528A - Hydraulic actuation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydraulic actuation device capable of cutting even an object positioned on an inner part in a place where a plurality of objects such as steel bars are intermingled complicatedly.SOLUTION: A hydraulic actuation device 10 includes an oil-pressure generation part 20 for generating a pressure oil, a cutting part 30 actuated by the pressure oil generated from the oil-pressure generation part 20, for cutting a rod-like object, and a connection part 40 for connecting the oil-pressure generation part 20 to the cutting part 30 so that the cutting part 30 can be rotated around a prescribed first axis M with respect to the oil-pressure generation part 20.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a hydraulic actuator for cutting a bar-like object such as a reinforcing bar.

  Conventionally, as a portable hydraulic tool (hydraulic actuator) operated by hydraulic pressure, a reinforcing bar cutter, a reinforcing bar bender, and the like as disclosed in Patent Document 1 and the like are known. Such hydraulic tools include, for example, a pump unit in which a hydraulic pump driven by an electric motor is provided, and a cutter tool and a bending tool driven by pressurized hydraulic oil supplied from the hydraulic pump. And so on.

  In the conventional hydraulic tool as described above, the pump unit and the tip instrument have an integral structure, and the combination of the pump unit and the tip instrument is rotated about the axis of the electric motor with respect to the electric motor. Be able to. Thereby, workability | operativity at the time of cutting or bending a reinforcing bar with a hydraulic tool can be improved.

JP 2012-225397 A

  In the conventional hydraulic tool described above, since the pump unit and the tip device have an integrated structure, there is a problem that a bar-like object such as a reinforcing bar cannot be cut unless it is a place where the entire tool can enter. More specifically, for example, in a place where a plurality of reinforcing bars are complicated, there is a problem that the reinforcing bars located in the back cannot be cut with a hydraulic tool.

  The present invention has been made in consideration of such points, and a hydraulic actuator that can cut an object located in the back even in a place where objects such as a plurality of reinforcing bars are complicated and complicated. The purpose is to provide.

  The hydraulic actuator according to the present invention includes a hydraulic pressure generating unit that generates pressure oil, a cutting unit that is operated by the pressure oil generated by the hydraulic pressure generating unit to cut a rod-like object, and the hydraulic pressure generating unit. And a connecting portion for connecting the hydraulic pressure generating portion and the cutting portion so that the cutting portion is rotatable about a predetermined first axis.

  According to such a hydraulic actuator, the whole apparatus is configured by connecting the hydraulic pressure generating unit and the cutting unit by the connecting unit so that the cutting unit is rotatable about the predetermined first axis with respect to the hydraulic pressure generating unit. It is possible to bend, so even in a place where a plurality of objects such as rebars are complicated, a hydraulic actuator that is bent is inserted in the back to cut the object located in the back of the hydraulic actuator. It can cut | disconnect by a part.

  In the hydraulic actuator according to the present invention, the connecting portion includes a pressure oil supply path for sending the pressure oil generated by the hydraulic pressure generating portion to the cutting portion, and an oil return for returning the return oil from the cutting portion to the hydraulic pressure generating portion. Each path may be provided.

  In the hydraulic actuator according to the present invention, the cutting portion may rotate about the first axis with respect to the hydraulic pressure generating portion.

  In the hydraulic actuator according to the present invention, the hydraulic pressure generator includes a pump unit in which a hydraulic pump is provided, and a motor unit in which a motor for driving the hydraulic pump is provided. The motor unit may be rotatable about a predetermined second axis extending in a different direction with respect to the first axis with respect to the pump unit.

  In this case, the second axis may extend in a direction orthogonal to the first axis.

  In the hydraulic actuator according to the present invention, the connecting portion is provided with an operating member for selectively fixing the position of the cutting portion with respect to the hydraulic pressure generating portion. On the other hand, when the position of the cutting part is fixed, the cutting part may be prevented from rotating with respect to the hydraulic pressure generating part.

  In this case, the operation member selects the position of the cutting portion with respect to the hydraulic pressure generating portion only when the angle of the cutting portion with respect to the hydraulic pressure generating portion is one of a plurality of preset values. It may be possible to be fixed.

  In the hydraulic actuator according to the aspect of the invention, the cutting unit is attached to the slider and is moved integrally with the slider, the slider being movable from the starting position toward the object. The operation of moving the slider from the starting point position toward the object may be performed by the pressure oil generated by the hydraulic pressure generating unit.

  According to the hydraulic actuator of the present invention, it is possible to cut an object located in the back even in a place where objects such as a plurality of reinforcing bars are complicated.

It is a perspective view which shows the external appearance of the hydraulic actuator by embodiment of this invention. It is a perspective view which shows an external appearance when the cutting part of the hydraulic actuator shown in FIG. 1 is rotated 90 degrees with respect to a hydraulic pressure generation part. It is a perspective view which shows the state in the middle of rotating the cutting | disconnection part of the hydraulic actuator shown in FIG. 1 with respect to a hydraulic pressure generation part. It is a perspective view which shows an external appearance when a motor unit is rotated at various angles with respect to a pump unit in the hydraulic pressure generation part of the hydraulic actuator shown in FIG. It is a front view of the hydraulic actuator shown in FIG. It is a top view which shows a structure when the cutting part of the hydraulic actuator shown in FIG. 1 is rotated 90 degrees with respect to a hydraulic pressure generation part. It is a longitudinal cross-sectional view by the ABCD of the hydraulic actuator shown in FIG. It is a longitudinal cross-sectional view of the hydraulic actuator shown in FIG. It is a cross-sectional view of the hydraulic actuator shown in FIG. It is a block diagram which shows the structure of the operation member in the hydraulic actuator shown in FIG. 1, and the hole in which this operation member is inserted. (A)-(c) is explanatory drawing which shows the flow of pressure oil and a return oil when cut | disconnecting a rod-shaped target object with the hydraulic actuator shown in FIG. (A) (b) is a block diagram which shows the flow of the pressure oil and return oil when a rod-shaped target object is cut | disconnected by the hydraulic actuator shown in FIG. 1 following the state shown in FIG. (A) (b) is a block diagram which shows the flow of the pressure oil and return oil when a rod-shaped target object is cut | disconnected by the hydraulic actuator shown in FIG. 1 following the state shown in FIG. (A) (b) is a block diagram which shows the flow of the return oil at the time of cut | disconnecting a rod-shaped target object with the hydraulic actuator shown in FIG. 1 following the state shown in FIG. (A) (b) is a block diagram which shows the flow of the return oil at the time of cut | disconnecting a rod-shaped target object with the hydraulic actuator shown in FIG. 1 following the state shown in FIG.

  Embodiments of the present invention will be described below with reference to the drawings. The hydraulic actuator according to the present embodiment cuts a rod-shaped object such as a reinforcing bar. 1 to 15 are views showing a hydraulic actuator according to the present embodiment. 1 is a perspective view showing the external appearance of the hydraulic actuator according to the present embodiment, and FIG. 2 is a diagram in which the cutting portion of the hydraulic actuator shown in FIG. 1 is rotated by 90 ° with respect to the hydraulic pressure generator. FIG. 3 is a perspective view showing a state in the middle of rotating the cutting portion of the hydraulic actuator shown in FIG. 1 with respect to the hydraulic pressure generating portion. FIG. 4 is a perspective view showing an appearance when the motor unit is rotated at various angles with respect to the pump unit in the hydraulic pressure generating unit of the hydraulic actuator shown in FIG. FIG. 5 is a front view of the hydraulic actuator shown in FIG. 6 is a top view showing a configuration when the cutting portion of the hydraulic actuator shown in FIG. 1 is rotated by 90 ° with respect to the hydraulic pressure generator, and FIG. 7 is a diagram of the hydraulic actuator shown in FIG. It is a longitudinal cross-sectional view by an A-B-C-D arrow. 8 and 9 are a longitudinal sectional view and a transverse sectional view of the hydraulic actuator shown in FIG. 1, respectively. FIG. 10 is a block diagram showing the configuration of the operating member and the hole into which the operating member is inserted in the hydraulic actuator shown in FIG. Further, FIGS. 11 to 15 illustrate the flow of pressure oil (specifically, pressurized hydraulic oil) and return oil in order when cutting a rod-like object by the hydraulic actuator shown in FIG. FIG. 5, 6, 8, and 9, a bar-like object such as a reinforcing bar to be cut by the hydraulic actuator according to the present embodiment is indicated by a reference symbol W.

  First, a schematic configuration of the hydraulic actuator 10 according to the present embodiment will be described with reference to FIGS. 1 to 5. As shown in FIG. 1 and the like, a hydraulic actuator 10 according to the present embodiment includes a hydraulic pressure generating unit 20 that generates pressure oil, a cutting unit 30 that is operated by the pressure oil generated by the hydraulic pressure generating unit 20, and a hydraulic pressure generating unit. The hydraulic pressure generating unit 20 and the cutting unit 30 are arranged so that the cutting unit 30 can rotate about a predetermined first axis (specifically, an axis indicated by a two-dot chain line M in FIGS. 1 to 5). It connects with the connection part 40 to connect, and the cutting | disconnection part 30 cut | disconnects rod-shaped objects, such as a reinforcing bar. Here, in the present embodiment, the cutting unit 30 rotates about the first axis M with respect to the hydraulic pressure generating unit 20. The hydraulic pressure generator 20 has a pump unit 22 in which a hydraulic pump 22a is provided, and a motor unit 24 in which an electric motor (not shown) for driving the hydraulic pump 22a is provided. With respect to the pump unit 22, the motor unit 24 is centered on a predetermined second axis (specifically, an axis indicated by a two-dot chain line N in FIGS. 4 and 5) extending in a different direction with respect to the first axis. It can be rotated as. Here, as shown in FIGS. 4 and 5, the second axis N extends in a direction orthogonal to the first axis M. Further, in the hydraulic pressure generating unit 20, a gripping unit 26 is connected to the motor unit 24, and when a rod-shaped object such as a reinforcing bar is cut by the hydraulic actuator 10 according to the present embodiment, the operator's hand The grip part 26 is gripped. In addition, the grip 26 is provided with a switch 26a that is operated by an operator's finger that grips the grip 26 with a hand. In addition, a battery 28 is attached to the lower end of the grip portion 26, and when the switch 26 a is operated by an operator, power is supplied from the battery 28 to the electric motor housed in the motor unit 24. It has come to be. Details of each component of the hydraulic actuator 10 will be described below.

  The cutting unit 30 includes a cutting cutter 32 for cutting a bar-shaped object such as a reinforcing bar, a receiving unit 34 that receives a bar-shaped object such as a reinforcing bar, and fragments when the object is cut by the cutting cutter 32. It has a plate-like scattering prevention member 36 for preventing scattering around. Here, as shown in FIG. 5, the receiving portion 34 has a concave shape that accepts a bar-like object such as a reinforcing bar, and after the object is received in the concave portion of the receiving portion 34, When the cutting cutter 32 moves in the left direction in FIG. 5 from the state shown in FIG. Further, as shown in FIG. 1 and the like, a stopper 34a is attached to the receiving portion 34 by a mounting bolt or the like so as to prevent the object received in the concave portion of the receiving portion 34 from moving as much as possible. Yes. Further, the cutting cutter 32 is attached to the slider 38, and when the switch 26a is operated by the operator, the cutting cutter 32 slides as the slider 38 moves leftward from the state shown in FIG. When the slider 38 moves integrally with the child 38 and the slider 38 moves leftward by a predetermined amount, the slider 38 and the cutting cutter 32 integrally move rightward in FIG. 5 and return to their original positions. It has become. Details of such operation will be described later.

  The connecting portion 40 is provided with a rod-like rotating member 42, and the rotating member 42 is rotatable with respect to the hydraulic pressure generating unit 20. The rotating member 42 is attached to the cutting part 30, and the cutting part 30 and the rotating member 42 are configured to rotate integrally with respect to the hydraulic pressure generating part 20 about the first axis M. As will be described later, a second supply oil path 58 and a third supply oil path 60 as pressure oil supply paths for sending the pressure oil generated by the oil pressure generation section 20 to the cutting section 30 are provided inside the rotating member 42, and A fifth return oil passage 90 is provided as an oil return passage for returning the return oil from the cutting portion 30 to the hydraulic pressure generating portion 20.

  Further, the connecting portion 40 is provided with a rod-like operation member 44 for selectively fixing the position of the cutting portion 30 with respect to the hydraulic pressure generating portion 20. When the position of 30 is fixed, the cutting part 30 is prevented from rotating with respect to the hydraulic pressure generating part 20. More specifically, the operation member 44 is used only when the angle of the cutting unit 30 with respect to the hydraulic pressure generating unit 20 is a predetermined size (specifically, the cutting unit with respect to the hydraulic pressure generating unit 20 as shown in FIG. 1). 2 only when the angle of 30 is 0 ° and when the angle of the cutting portion 30 relative to the hydraulic pressure generating portion 20 is 90 ° as shown in FIG. Can be selectively fixed.

  More specifically, as shown in FIGS. 8 and 10, a hole 49 through which a rod-like operation member 44 can be inserted is formed in the hydraulic pressure generating unit 20. The cutting portion 30 is formed with two holes 46 and 48 into which rod-like operation members 44 can be respectively inserted. When the operation member 44 inserted into the hole 49 provided in the hydraulic pressure generating unit 20 is inserted into one of the two holes 46 and 48 provided in the cutting unit 30, As shown in FIG. 1, the position of the cutting unit 30 with respect to the hydraulic pressure generating unit 20 is fixed in a state where the angle of the cutting unit 30 with respect to the hydraulic pressure generating unit 20 is 0 °. On the other hand, when the operation member 44 inserted into the hole 49 provided in the hydraulic pressure generating unit 20 is inserted into the other hole 46 of the two holes 46 and 48 provided in the cutting unit 30, As shown in FIG. 2, the position of the cutting unit 30 with respect to the hydraulic pressure generating unit 20 is fixed in a state where the angle of the cutting unit 30 with respect to the hydraulic pressure generating unit 20 is 90 °. When the operator rotates the cutting unit 30 with respect to the hydraulic pressure generating unit 20, the operating member 44 is pulled upward as shown in FIG. 3, and the holes 46 and 48 provided in the cutting unit 30 are inserted. It is assumed that the operation member 44 is not inserted. As a result, the cutting unit 30 is not fixed to the hydraulic pressure generating unit 20 by the operation member 44, so that the cutting unit 30 can be rotated with respect to the hydraulic pressure generating unit 20.

  As shown in FIG. 10, the operation member 44 has a rod-shaped positioning pin 44b and a knob 44a that is attached to the upper end of the positioning pin 44b and can be gripped by the operator's finger. A concave groove 44c is formed on the outer peripheral surface in the vicinity of the upper end portion of the positioning pin 44b so as to extend in the circumferential direction. Further, a hole 45d is formed in the hydraulic pressure generating portion 20, and the pin 45a and the pin 45b toward the groove 44c of the positioning pin 44b (that is, rightward in FIG. 10) are formed in the hole 45d. A spring 45b that presses 45a is fixed by a bolt 45c. Then, as shown in FIG. 10, the positioning pin 44b of the operation member 44 is inserted into any one of the hole 49 provided in the hydraulic pressure generating unit 20 and the two holes 46, 48 provided in the cutting unit 30. In this state, the pin 45a is pressed by the spring 45b toward the groove 44c of the positioning pin 44b, thereby positioning the positioning pin 44b from one of the two holes 46 and 48 provided in the cutting portion 30. Is made difficult to come off. Further, in the vicinity of the lower end portion of the positioning pin 44b, a concave groove 44d for preventing the positioning pin 44b from being completely removed from the hole 49 provided in the hydraulic pressure generating unit 20 is an outer peripheral surface of the positioning pin 44b. It is formed to extend along the circumferential direction. Here, when the operator tries to completely pull out the positioning pin 44b from the hole 49 provided in the hydraulic pressure generating unit 20, the pin 45a pressed by the spring 45b is caught in the groove 44d, so that the positioning pin 44b is in the hole 49. It will be suppressed from being completely pulled out from.

  Next, the internal configuration of the hydraulic pressure generating unit 20, the cutting unit 30, and the connecting unit 40 will be described with reference to FIGS. As described above, FIG. 6 shows a configuration when the cutting unit 30 of the hydraulic actuator 10 shown in FIG. 1 is rotated by 90 ° with respect to the hydraulic pressure generating unit 20 (that is, the configuration in the state shown in FIG. 2). FIG. 7 is a top view, and FIG. 7 is a vertical cross-sectional view of the hydraulic actuator 10 shown in FIG. 8 and 9 are a longitudinal sectional view and a transverse sectional view of the hydraulic actuator 10 shown in FIG. 1, respectively.

  As shown in FIGS. 7 to 9, an eccentric shaft 50 that is rotationally driven by an electric motor is provided inside the pump unit 22, and a piston 52 is disposed in the vicinity of the tip portion of the eccentric shaft 50. Has been. Although only one piston 52 is shown in FIGS. 7 to 9, actually three pistons 52 are arranged to extend radially from the tip portion of the eccentric shaft 50. A check valve 54 is attached to the tip of each piston 52. In addition, an oil tank 94 for storing oil is provided inside the hydraulic pressure generating unit 20, and the eccentric shaft 50 is rotationally driven by an electric motor, and the proximal end portion of each piston 52 is driven by the distal end portion of the eccentric shaft 50. Is pushed outward (that is, upward in FIGS. 7 to 9), an oil path between the oil tank 94 and the first supply oil path 56 (described later) is opened by the check valve 54, and the oil tank Pressure oil is supplied from 94 to the first supply oil passage 56. On the other hand, in a state where the eccentric shaft 50 is not rotationally driven by the electric motor, that is, in a state where the switch 26a is not operated by the operator, an oil passage between the oil tank 94 and the first supply oil passage 56 (described later) is provided. The check valve 54 closes the pressure oil from the oil tank 94 to the first supply oil passage 56. As described above, in this embodiment, the hydraulic pump 22 a is configured by the pistons 52 and the check valves 54 attached to the tips of the pistons 52.

  As shown in FIGS. 7 to 9, a first supply oil passage 56 and a second supply oil passage for sending pressure oil from the oil tank 94 toward the slider 38 are provided inside the hydraulic actuator 10 according to the present embodiment. 58, a third supply oil passage 60, a fourth supply oil passage 62, and a fifth supply oil passage 64 are provided, and the oil chamber passes through the supply oil passages 56, 58, 60, 62, 64 in order from the oil tank 94. Pressure oil is sent to 66. Here, the first supply oil passage 56 is provided inside the pump unit 22 of the hydraulic pressure generating unit 20, and the second supply oil passage 58 and the third supply oil passage 60 are respectively inside the rotating member 42 of the connecting portion 40. Is provided. Further, the fourth supply oil passage 62, the fifth supply oil passage 64, and the oil chamber 66 are provided inside the cutting part 30. Here, in the hydraulic actuator 10 according to the present embodiment, the first supply oil passage provided in the pump unit 22 is whatever the angle of the cutting part 30 with respect to the hydraulic pressure generating part 20 is. 56 and the second supply oil passage 58 provided inside the rotation member 42 communicate with each other, and are provided inside the third supply oil passage 60 provided inside the rotation member 42 and the cutting part 30. The configuration (specifically, shape and position) of the second supply oil path 58 and the third supply oil path 60 provided inside the rotating member 42 so that the fourth supply oil path 62 communicates with each other. Is decided.

  As shown in FIGS. 8 and 9, a flange 38a is provided at the base end portion of the slider 38, and the oil chamber 66 is located on the rear surface of the flange 38a (that is, on the right side in FIGS. 8 and 9). Face). When the pressure oil is sent to the oil chamber 66 by the hydraulic pump 22a, the flange 38a is pushed leftward in FIGS. 8 and 9 by the pressure oil sent to the oil chamber 66. As described above, the cutting cutter 32 is attached to the tip portion of the slider 38, and when the flange 38a is pushed leftward in FIGS. 8 and 9 by the pressure oil sent to the oil chamber 66. The cutting cutter 32 moves integrally with the slider 38 in the left direction in FIGS. 8 and 9, and the cutting cutter 32 cuts a bar-shaped object such as a reinforcing bar. Further, a space 67 is provided inside the slider 38, and the space 67 and the oil chamber 66 communicate with each other.

  Further, a spring 70 is attached to the slider 38, and the slider 38 is pressed in the right direction in FIGS. More specifically, when the switch 26a is operated by the operator, the slider 38 moves to the left from the state shown in FIG. When the slider 38 moves to the left by a predetermined amount, the slider 38 moves to the right in FIG. 5 by the pressing force of the spring 70 and returns to the original position. It has become. Details of the operation of the slider 38 will be described later.

  Further, as shown in FIG. 9, an oil chamber 80 in which oil (specifically, working oil) is accommodated is provided in the cutting portion 30, and rubber is provided in the oil chamber 80. A cylindrical member 82 (oil leveler sack) made of a flexible material such as the like is disposed. Here, oil is not stored in the internal space 82 a of the cylindrical member 82, and oil is stored outside the cylindrical member 82 inside the oil chamber 80. Further, the cylindrical member 82 expands and contracts between a contracted state as shown by a solid line in FIG. 9 and a non-contracted state as shown by a two-dot chain line in FIG. The amount of oil stored in the oil chamber 80 varies depending on the shape of the member 82. An oil chamber 81 faces the front surface of the flange 38a provided at the proximal end portion of the slider 38 (that is, the left surface in FIGS. 8 and 9). Oil chambers 80 communicate with each other. For this reason, when the flange 38a is pushed leftward in FIGS. 8 and 9 by the pressure oil sent to the oil chamber 66, the volume of the oil chamber 81 is reduced, so that the oil contained in the oil chamber 81 is reduced. Is sent to the oil chamber 80, and returned from the oil chamber 80 to the oil tank 94 through the return oil passages 85, 86, 88, 90, 92 as return oil.

  Further, as shown in FIGS. 7 to 9, a first return oil passage 84 is provided inside the cutting portion 30, and the first return oil passage 84 is connected to the first return oil passage 85 via a second return oil passage 85. Three return oil passages 86 are connected. In addition, one end of a third return oil passage 86 is connected to the oil chamber 80. Further, as shown in FIG. 7, a fourth return oil path 88 is connected to the second return oil path 85. Further, as described above, the fifth return oil passage 90 is provided inside the rotating member 42 of the connecting portion 40, and one end of the fourth return oil passage 88 is connected to the fifth return oil passage 90. ing. Further, as shown in FIG. 7, a sixth return oil path 92 having one end connected to the oil tank 94 is provided inside the pump unit 22, and the sixth return oil path from the fifth return oil path 90 is provided. The oil (return oil) is returned to the oil tank 94 through the path 92. In this manner, the return oil is returned from the first return oil passage 84 and the oil chamber 80 to the oil tank 94 through the return oil passages 85, 86, 88, 90, and 92. Here, in the hydraulic operating device 10 according to the present embodiment, the sixth return oil passage provided inside the pump unit 22 no matter what the angle of the cutting part 30 with respect to the hydraulic pressure generating part 20 is. 92 and the fifth return oil passage 90 provided inside the rotation member 42 communicate with each other, and are provided inside the fifth return oil passage 90 provided inside the rotation member 42 and the cutting portion 30. The configuration (specifically, shape and position) of the fifth return oil passage 90 provided inside the rotating member 42 is determined so that the fourth return oil passage 88 communicates with each other.

  Further, as shown in FIGS. 8 and 9, a release valve 72 is accommodated in a space 67 provided inside the slider 38, and a tip portion (first end oil passage 84 ( That is, the left end portion in FIGS. 8 and 9 is selectively closed. 8 and 9 show a state in which the distal end portion of the first return oil passage 84 is closed by the release valve 72. On the other hand, when the release valve 72 moves to the left from the position shown in FIGS. 8 and 9, the distal end portion of the first return oil passage 84 (that is, the left end in FIGS. 8 and 9) is opened by the release valve 72. As a result, the space 67 provided in the slider 38 and the first return oil passage 84 communicate with each other (see FIGS. 14 and 15). As a result, the oil sent from the oil tank 94 to the oil chamber 66 by the hydraulic pump 22a is sent to the first return oil passage 84 through the space 67, and each return oil passage as return oil from the first return oil passage 84. It returns to the oil tank 94 through 85, 88, 90, 92. Also, a spring is attached to the release valve 72, and the release valve 72 is pressed toward the first return oil passage 84 by the spring (that is, toward the right in FIGS. 8 and 9). ing.

  Next, the operation of the hydraulic actuator 10 having such a configuration will be described.

  As described above, in the hydraulic actuator 10 according to the present embodiment, the cutting unit 30 can be rotated about the predetermined first axis M with respect to the hydraulic pressure generating unit 20. For this reason, the angle of the cutting part 30 with respect to the hydraulic pressure generating part 20 is set to 0 ° according to the state of a rod-like object such as a reinforcing bar to be cut by the hydraulic actuator 10 according to the present embodiment as shown in FIG. As shown in FIG. 2, the angle of the cutting part 30 with respect to the hydraulic pressure generating part 20 can be set to 90 °. Further, in the hydraulic actuator 10 according to the present embodiment, the motor unit 24 is rotated about the predetermined second axis N with respect to the pump unit 22 in the hydraulic pressure generating unit 20, thereby causing the motor unit 24 to be Any of the positions A, B, C, and D can be set. In this way, by rotating the cutting unit 30 with respect to the hydraulic pressure generating unit 20 or rotating the motor unit 24 with respect to the pump unit 22 in the hydraulic pressure generating unit 20, objects such as a plurality of reinforcing bars are complicated. It becomes possible to put the hydraulic actuator 10 in the back even in a place where it is complicated.

  In the present embodiment, when the operator determines the position of the cutting portion 30 with respect to the hydraulic pressure generating portion 20, the operation member 44 of the connecting portion 40 is pulled upward from the state shown in FIG. 1 and FIG. 2 (see FIG. 3). It is assumed that the operation member 44 is not inserted into the holes 46 and 48 provided in the cutting part 30. As a result, the cutting unit 30 is not fixed to the hydraulic pressure generating unit 20 by the operation member 44, so that the cutting unit 30 can be rotated with respect to the hydraulic pressure generating unit 20. Then, the operator rotates the cutting unit 30 with respect to the hydraulic pressure generating unit 20 to set the angle of the cutting unit 30 with respect to the hydraulic pressure generating unit 20 to 0 ° or 90 °, and then moves the operation member 44 of the connecting unit 40 downward. When the operation member 44 is inserted into any one of the two holes 46 and 48 provided in the cutting part 30 by pushing, the position of the cutting part 30 with respect to the hydraulic pressure generating part 20 is fixed. It becomes like this.

  After the operator determines the position of the cutting unit 30 with respect to the hydraulic pressure generating unit 20 and the position of the cutting unit 30 with respect to the hydraulic pressure generating unit 20 is fixed by the operation member 44, the operator manually holds the grip unit 26 of the hydraulic actuator 10. Next, a bar-shaped object such as a reinforcing bar is inserted into the concave portion of the receiving portion 34 of the cutting portion 30. When the switch 26 a is operated by the operator's finger holding the grip portion 26 by hand, electric power is supplied from the battery 28 to the electric motor housed in the motor unit 24. When the electric motor is driven in this manner, the eccentric shaft 50 is rotated by the electric motor, and the base end portion of each piston 52 is pressed outward by the distal end portion of the eccentric shaft 50, whereby the oil tank. An oil passage between 94 and the first supply oil passage 56 is opened by the check valve 54. As a result, pressure oil is supplied from the oil tank 94 to the first supply oil passage 56, and the supplied pressure oil is sent to the oil chamber 66 through the supply oil passages 56, 58, 60, 62, 64. In addition, in FIG. 11 (a)-(c), the state when the slider 38 to which the cutting cutter 32 is attached exists in a starting point position is shown. In a state where the electric motor of the hydraulic actuator 10 is not driven, the slider 38 is positioned at the start position as shown in FIGS. In addition, in FIGS. 11 to 15, the pressure oil supply flow path from the hydraulic pump 22 a provided in the pump unit 22 to the cutting unit 30 is indicated by a dot pattern, and the return oil return flow path to the oil tank 94. Is indicated by diagonal lines.

  As described above, when the hydraulic oil is sent from the oil tank 94 to the oil chamber 66 through the supply oil passages 56, 58, 60, 62, 64 by the hydraulic pump 22 a, the pressure oil sent to the oil chamber 66 causes flanges to be generated. 38a is pushed leftward from the position shown in FIGS. 11 (b) and 11 (c). As described above, the cutting cutter 32 is attached to the tip of the slider 38, and the flange 38a is moved leftward from the position shown in FIGS. 11B and 11C by the pressure oil sent to the oil chamber 66. When pushed, the cutting cutter 32 moves integrally with the slider 38 in the left direction in FIG. FIGS. 12A and 12B show a state where the slider 38 has advanced 15 mm toward the rod-shaped object from the state shown in FIG. 11, and FIGS. 12 shows a state in which the slider 38 further advances toward the object from the state shown in FIG. 12, and the slider 38 moves to the maximum from the starting position. As shown in FIGS. 13 (a) and 13 (b), when the slider 38 moves to the maximum extent from the starting position toward the object, the object is cut by the cutting cutter 32 attached to the slider 38. Become so. Since the volume of the oil chamber 81 is reduced while the slider 38 is pushed leftward from the starting position shown in FIGS. 11B and 11C, the oil contained in the oil chamber 81 is oil. In addition to being sent to the chamber 80, the oil chamber 80 returns to the oil tank 94 through the return oil passages 85, 86, 88, 90, 92 as return oil. Moreover, the cylindrical member 82 provided in the oil chamber 80 comes to expand, and the amount of oil contained in the oil chamber 80 is reduced (see FIG. 13B).

  Further, while the slider 38 is pushed leftward from the starting position shown in FIGS. 11B and 11C, the release valve 72 is moved to the first return oil passage 84 by a spring attached to the release valve 72. Is pushed to the side (that is, toward the right direction in FIGS. 11B and 11C), whereby the tip portion of the first return oil passage 84 (that is, the left end portion in FIGS. 11B and 11C) ) Is closed by the release valve 72. As a result, the space 67 provided in the slider 38 and the first return oil passage 84 are blocked by the release valve 72, so that the cutting portion is separated from the hydraulic pump 22 a provided in the pump unit 22. Thus, the pressure oil supply channel to 30 and the return oil return channel to the oil tank 94 do not communicate with each other.

  Further, as shown in FIGS. 13A and 13B, when the slider 38 moves to the maximum extent from the starting position toward the object, the release valve 72 is moved to the left in FIG. 13 by the flange 38a of the slider 38. It is pushed. As a result, the distal end portion of the first return oil passage 84 (that is, the left end portion in FIG. 13) is opened by the release valve 72, and the space 67 provided in the slider 38 and the first return portion are opened. The oil passage 84 communicates with each other. As a result, as shown in FIG. 14, the pressure oil supply channel from the hydraulic pump 22 a provided in the pump unit 22 to the cutting unit 30 and the return channel of the return oil to the oil tank 94 communicate with each other. The oil sent from the oil tank 94 to the oil chamber 66 through the supply oil passages 56, 58, 60, 62, 64 by the hydraulic pump 22a is a space 67 provided inside the slider 38. From the first return oil passage 84 and returned to the oil tank 94 through the return oil passages 85, 88, 90, 92 as return oil. As a result, the slider 38 is not pushed in the left direction in FIG. 14 by the oil sent to the oil chamber 66, and the slider 38 is moved in the right direction in FIG. become. FIGS. 15A and 15B show a state where the slider 38 is retracted 10 mm in the right direction in FIG. 14 from the state shown in FIG.

  In this way, while the slider 38 is moved toward the starting position by the pressing force of the spring 70, the oil sent from the space 67 provided in the slider 38 to the first return oil passage 84. By being sent to the oil chamber 80 through the return oil passages 85 and 86, the cylindrical member 82 provided inside the oil chamber 80 contracts. The cylindrical member 82 made of a flexible material such as rubber gradually contracts, so that the sliding element is opened when the distal end portion of the first return oil passage 84 is opened by the release valve 72. It is suppressed that 38 is returned to the starting point position at a stretch, and the slider 38 gradually moves toward the starting point position. When the slider 38 is returned to the starting position as shown in FIG. 11, the tip portion of the first return oil passage 84 is closed by the release valve 72. Thus, when the slider 38 is returned to the starting position as shown in FIG. 11, the hydraulic actuator 10 returns to the standby state.

  According to the hydraulic actuator 10 of the present embodiment configured as described above, a hydraulic pressure generating unit 20 that generates pressure oil, and a rod-shaped target such as a reinforcing bar that is operated by the pressure oil generated by the hydraulic pressure generating unit 20. A cutting portion 30 for cutting an object, and a connecting portion 40 for connecting the hydraulic pressure generating portion 20 and the cutting portion 30 so that the cutting portion 30 is rotatable about a predetermined first axis M with respect to the hydraulic pressure generating portion 20. Are provided, so that it is possible to bend the entire apparatus, and thus it is possible to cut an object located in the back even in a place where a plurality of objects such as rebars are complicated and complicated. . More specifically, in the conventional hydraulic actuator, since the pump unit and the cutting part have an integrated structure, there is a problem that a bar-shaped object such as a reinforcing bar cannot be cut unless it is a place where the entire tool can enter. was there. Specifically, for example, in a place where a plurality of reinforcing bars are complicated, there is a problem that the reinforcing bars located in the back cannot be cut by a conventional hydraulic actuator. On the other hand, in the hydraulic actuator 10 according to the present embodiment, by rotating the cutting unit 30 with respect to the hydraulic pressure generator 20, for example, the hydraulic actuator 10 that is bent even in a place where a plurality of reinforcing bars are intricately complicated is provided. By inserting in the back, the reinforcing bar located in the back can be cut by the cutting part 30 of the hydraulic actuator 10.

  Further, in the hydraulic actuator 10 of the present embodiment, as described above, the connecting portion 40 is supplied with the pressure oil supply path (specifically, the pressure oil generated by the hydraulic pressure generating unit 20 to the cutting unit 30). A second supply oil path 58 and a third supply oil path 60) and an oil return path (specifically, a fifth return oil path 90) for returning the return oil from the cutting part 30 to the hydraulic pressure generating part 20. ing. In this case, even when the cutting unit 30 is rotated with respect to the hydraulic pressure generating unit 20, the pressure oil and the return oil can be transferred between the hydraulic pressure generating unit 20 and the cutting unit 30 by the connecting unit 40. become. In the present embodiment, as described above, the first supply oil passage 56 provided in the pump unit 22 is whatever the angle of the cutting part 30 with respect to the hydraulic pressure generating part 20 is. And a second supply oil passage 58 provided in the connecting portion 40 communicate with each other, and a third supply oil passage 60 provided in the connecting portion 40 and a fourth supply provided inside the cutting portion 30. It is preferable that the configurations of the second supply oil path 58 and the third supply oil path 60 provided in the connecting portion 40 are determined so that the oil path 62 communicates with each other. In addition, the sixth return oil path 92 provided in the pump unit 22 and the fifth provided in the connecting part 40, whatever the angle of the cutting part 30 with respect to the hydraulic pressure generating part 20 is. The return oil passage 90 communicates with each other, and the fifth return oil passage 90 provided in the connecting portion 40 and the fourth return oil passage 88 provided in the cutting portion 30 communicate with each other. The configuration of the fifth return oil passage 90 provided in the portion 40 is preferably determined.

  In the hydraulic actuator 10 of the present embodiment, as described above, the cutting unit 30 rotates about the first axis M with respect to the hydraulic pressure generating unit 20. In this case, the moving range of the cutting unit 30 with respect to the hydraulic pressure generating unit 20 is predetermined as compared to the case where the cutting unit 30 rotates about two or more axes with respect to the hydraulic pressure generating unit 20. Therefore, the usability of the hydraulic actuator 10 is improved. More specifically, if the cutting unit 30 is configured to rotate about two or more axes with respect to the hydraulic pressure generating unit 20, the hydraulic pressure generating unit 20 may be interposed between the hydraulic generating unit 20 and the cutting unit 30. In this case, the intermediate arm rotates with respect to the hydraulic pressure generating unit 20 and the cutting unit 30 further rotates with respect to the intermediate arm, so that the movement of the cutting unit 30 is complicated. End up. On the other hand, in the hydraulic actuator 10 of the present embodiment, the cutting unit 30 simply rotates with respect to the hydraulic pressure generating unit 20 around the first axis M, so that the movement of the cutting unit 30 is simplified. Will be able to.

  In the hydraulic actuator 10 according to the present embodiment, as described above, the hydraulic pressure generator 20 includes the pump unit 22 in which the hydraulic pump 22a is provided and the electric motor that drives the hydraulic pump 22a. The pump unit 22 is rotatable about a predetermined second axis N extending in a different direction with respect to the first axis M with respect to the motor unit 24. Yes. In this case, by rotating the motor unit 24 with respect to the pump unit 22, it becomes possible to bend the entire apparatus further, so that it can be more reliably bent even in a place where a plurality of objects such as rebars are complicated. The hydraulic actuator 10 can be inserted in the back. Further, the second axis N extends in a direction orthogonal to the first axis M. As a result, the degree of freedom of bending of each component of the hydraulic actuator 10 can be further increased. In the hydraulic actuator 10 according to the present embodiment, the second axis N is not limited to extend in a direction orthogonal to the first axis M. In the hydraulic actuator 10 of another example, the angle of the second axis N with respect to the first axis M may be an arbitrary angle other than 90 °.

  Further, in the hydraulic actuator 10 of the present embodiment, as described above, the connecting member 40 is provided with the operation member 44 for selectively fixing the position of the cutting unit 30 with respect to the hydraulic pressure generating unit 20. Therefore, when the position of the cutting unit 30 is fixed with respect to the hydraulic pressure generating unit 20 by the operation member 44, the cutting unit 30 is not rotated with respect to the hydraulic pressure generating unit 20. In this case, after the cutting unit 30 is rotated with respect to the hydraulic pressure generating unit 20, the position of the cutting unit 30 with respect to the hydraulic pressure generating unit 20 is fixed by the operation member 44, thereby cutting the object by the cutting unit 30. It is possible to prevent the cutting unit 30 from rotating with respect to the hydraulic pressure generation unit 20 in the middle, and thus the object can be more stably cut by the cutting unit 30. Further, the operation member 44 is hydraulic only when the angle of the cutting unit 30 with respect to the hydraulic pressure generating unit 20 is one of two preset values (specifically, 0 ° and 90 °). The position of the cutting part 30 with respect to the generating part 20 can be selectively fixed. In addition, the hydraulic actuator 10 by this Embodiment is not limited to the thing of such an aspect. In the hydraulic actuator 10 of another example, the cutting unit for the hydraulic pressure generating unit 20 only when the angle of the cutting unit 30 with respect to the hydraulic pressure generating unit 20 is any of three or more preset values. The 30 positions may be selectively fixed.

  Moreover, in the hydraulic actuator 10 of this Embodiment, as mentioned above, the cutting part 30 is attached to the slider 38 which can move toward a target object from a starting point position, and the slider 38. And a cutting cutter 32 (cutting portion) that moves integrally with the slider 38, and the operation of moving the slider 38 from the starting position toward the object is performed by the hydraulic pressure generator 20. This is done by the generated pressure oil. That is, the hydraulic actuator 10 of the present embodiment is a single-acting type.

  The hydraulic actuator according to the present embodiment is not limited to the above-described mode, and various changes can be made.

  For example, in the above description, the hydraulic actuator 10 in which the motor unit 24 rotates with respect to the pump unit 22 in the hydraulic pressure generator 20 has been described. However, the hydraulic actuator according to the present embodiment has such an aspect. It is not limited to. As a hydraulic actuator according to the modification, a hydraulic pressure generating unit in which a motor unit is fixedly attached to a pump unit may be used.

  In the above description, the single-acting hydraulic actuator 10 has been described. However, the hydraulic actuator according to the present embodiment is not limited to the single-acting one. As the hydraulic actuator according to the modified example, the operation of moving the slider 38 from the starting point position toward the object and the operation of returning the slider 38 to the starting point position are respectively performed by the pressure oil generated by the hydraulic pressure generating unit 20. A double-acting type as performed may be used.

DESCRIPTION OF SYMBOLS 10 Hydraulic actuator 20 Hydraulic generation part 22 Pump unit 22a Hydraulic pump 24 Motor unit 26 Grip part 26a Switch 28 Battery 30 Cutting part 32 Cutting cutter 34 Receiving part 34a Stopper 36 Scatter prevention member 38 Slider 38a Flange 40 Connecting part 42 Rotation Member 44 Operation member 44a Knob 44b Positioning pin 44c, 44d Groove 45a Pin 45b Spring 45c Bolt 45d Hole 46 Hole 48, 49 Hole 50 Eccentric shaft 52 Piston 54 Check valve 56 First supply oil path 58 Second supply oil path 60 Third Supply oil path 62 Fourth supply oil path 64 Fifth supply oil path 66 Oil chamber 67 Space 70 Spring 72 Release valve 80, 81 Oil chamber 82 Cylindrical member 82a Internal space 84 First return oil path 85 Second return oil path 86 3rd return oil path 88 4th return oil path 90 5th And the oil passage 92 sixth oil return passage 94 oil tank

Claims (8)

A hydraulic pressure generating section for generating pressure oil;
A cutting unit for cutting a rod-like object that is operated by the pressure oil generated by the hydraulic pressure generating unit;
A connecting portion that connects the hydraulic pressure generating portion and the cutting portion such that the cutting portion is rotatable about a predetermined first axis with respect to the hydraulic pressure generating portion;
With hydraulic actuator.   The connecting part is provided with a pressure oil supply path for sending pressure oil generated by the oil pressure generating part to the cutting part and an oil return path for returning oil from the cutting part to the oil pressure generating part, respectively. Item 1. The hydraulic actuator according to Item 1.   3. The hydraulic actuator according to claim 1, wherein the cutting portion rotates about the first axis with respect to the hydraulic pressure generating portion. The hydraulic pressure generator includes a pump unit in which a hydraulic pump is provided, and a motor unit in which a motor for driving the hydraulic pump is provided.
4. The hydraulic pressure according to claim 1, wherein the motor unit is rotatable with respect to the pump unit about a predetermined second axis extending in a different direction with respect to the first axis. 5. Actuator.   The hydraulic actuator according to claim 4, wherein the second axis extends in a direction orthogonal to the first axis. The connecting portion is provided with an operation member for selectively fixing the position of the cutting portion with respect to the hydraulic pressure generating portion,
6. The cutting unit according to claim 1, wherein when the position of the cutting unit is fixed with respect to the hydraulic pressure generating unit by the operation member, the cutting unit is not rotated with respect to the hydraulic pressure generating unit. Hydraulic actuator according to item.   The operation member selectively fixes the position of the cutting portion with respect to the hydraulic pressure generating portion only when the angle of the cutting portion with respect to the hydraulic pressure generating portion is any of a plurality of preset values. The hydraulic actuator of claim 6, wherein the hydraulic actuator is capable of doing so. The cutting portion includes a slider that is movable from a starting position toward an object, and a cutting portion that is attached to the slider and moves integrally with the slider. ,
The operation of moving the slider from the start position toward the object is performed by pressure oil generated by the hydraulic pressure generating unit. Hydraulic actuator.

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