JP2018059521A - Pressure increasing device for vehicle for high lift work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure increasing device for a high lift work vehicle equipped with a hydraulic type crimp tool capable of holding a compression object without deformation.SOLUTION: A booster apparatus 12 for a vehicle 1 for high lift work to feed working oil boosted by a booster cylinder 13 to a hydraulic type crimp tool 100 comprises: a supply oil passage 15 for connecting the pressure chamber 13a of the pressure cylinder 13 and the hydraulic type crimp tool 100; an electromagnetic changeover valve connected to the supply oil passage 15 and interchanged between a state, in which the working oil is fed to the supply oil passage 15, and a state, in which the working oil is not fed; and a distance measuring means for measuring the distance between the movable part 100a of the hydraulic type crimp tool 100 and the pressure object by the hydraulic type crimp tool 100. The electromagnetic changeover valve is changed over on the basis of the detection value of the distance measuring means.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pressure booster. More specifically, the present invention relates to a pressure boosting device for an aerial work vehicle 1 that supplies pressurized hydraulic oil to a hydraulic tool.

  2. Description of the Related Art Conventionally, there is known an aerial work vehicle provided with a bucket on which an operator gets on the tip of a telescopic boom. The aerial work vehicle is configured to be able to supply hydraulic oil to hydraulic equipment such as a hydraulic tool in a bucket. An aerial work vehicle for electrical wiring work is configured to be able to supply hydraulic oil to a hydraulic crimping tool, which is a hydraulic tool that connects power lines by crimping a sleeve for electrical wiring. The aerial work vehicle configured in this way is provided with a pressure increasing device for supplying increased hydraulic oil. For example, as described in Patent Document 1.

  The pressure increasing device for an aerial work vehicle described in Patent Document 1 controls the pressure increasing cylinder by switching between an upstream direction control valve and a downstream direction control valve to increase the hydraulic pressure of hydraulic oil. In the pressure booster, a downstream direction control valve is connected in series to an upstream direction control valve to which hydraulic oil is supplied from a hydraulic pump. The directional control valve on the upstream side selectively selects a state in which hydraulic oil is supplied to the rod side oil chamber of the pressure increasing cylinder and the hydraulic crimping tool is returned, and a state in which the hydraulic oil pressure tool is supplied to the downstream directional control valve. It is configured to switch. The directional control valve on the downstream side supplies hydraulic oil to the hydraulic pressure crimping tool without increasing the hydraulic pressure to temporarily hold the hydraulic pressure bonding tool, and supplies hydraulic oil to the head side oil chamber of the pressure increasing cylinder. Thus, the operation oil is increased and the hydraulic pressure crimping tool is selectively switched to a state where the main compression operation is performed.

  In the pressure increasing device described in Patent Document 1, the pressure increasing cylinder is provided with a pressure switch for detecting whether or not the pressure in the pressure increasing chamber exceeds a predetermined pressure. When performing the main compression operation, if it is detected that the pressure switch exceeds a predetermined pressure, for example, a specified pressure, or if the operation is switched to the return operation by an operation switch or the like, the control means is connected to the upstream direction control valve and the downstream side. The direction control valve is switched and a return operation is performed to discharge hydraulic fluid from the hydraulic crimping tool. However, when the temporary holding operation is performed, the pressure in the pressure increasing chamber is detected, and the upstream direction control valve and the downstream direction control valve are not switched. Therefore, when the temporary holding operation is performed, the sleeve may be deformed.

JP 2014-20543 A

  An object of the present invention is to provide a pressure increasing device for an aerial work vehicle including a hydraulic pressure bonding tool capable of holding a pressurized object without being deformed.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  That is, the booster for an aerial work vehicle is a booster for an aerial work vehicle that supplies hydraulic oil that has been boosted by a booster cylinder to a hydraulic pressure bonding tool, and includes a booster chamber of the booster cylinder. A hydraulic oil supply valve for connecting the hydraulic pressure crimping tool to the hydraulic oil pressure switch, an electromagnetic switching valve that is connected to the hydraulic oil supply passage and is switched between a state in which the working oil is supplied to the hydraulic oil passage and a state in which the working oil is not supplied. A distance measuring unit between a movable part of the crimping tool and an object to be pressurized by the hydraulic crimping tool, and the electromagnetic switching valve is switched based on a detection value of the distance measuring unit.

  The pressure increasing device for an aerial work vehicle is one in which the electromagnetic switching valve is switched to a state where hydraulic oil is not supplied to the supply oil passage after a predetermined time has elapsed since the distance measuring means has detected a reference value. .

  In the pressure booster for an aerial work vehicle, the electromagnetic switching valve does not supply hydraulic oil to the supply oil passage when the speed of the movable part detected by the distance measuring means is equal to or lower than a predetermined speed. It can be switched to a state.

  In the pressure booster for an aerial work vehicle, the distance measuring means between the movable part and the pressurizing object is a displacement sensor.

  In the pressure booster for an aerial work vehicle, the distance measuring means between the movable part and the object to be pressurized is a stroke sensor of the movable part.

  The pressure booster for an aerial work vehicle detects the detection value of the stroke sensor of the movable part when holding the one pressurization object with the hydraulic crimping tool, and is the same as the one pressurization object When holding another pressurized object of the same size or the same pressurized object, the electromagnetic switching valve is based on the detection value of the stroke sensor of the movable part when the one pressurized object is held. The operation oil can be switched to a state where hydraulic oil is not supplied to the supply oil passage.

  The booster for an aerial work vehicle is controlled such that when the electromagnetic switching valve is a proportional control valve and the distance measuring means detects a reference value, the proportional control valve decelerates and stops the movable part. Is.

  In an intensifier for an aerial work vehicle, the position of the movable part with respect to the pressurization object is controlled. Thereby, a pressurization target object can be held without changing.

  In a pressure booster for an aerial work vehicle, the holding position for the pressurization object is controlled based on the position and time of the movable part. Thereby, a pressurization target object can be held without changing.

  In a pressure booster for an aerial work vehicle, the holding position for the pressurization object is controlled based on the speed of the movable part. Thereby, a pressurization target object can be held without changing.

  In the pressure booster for an aerial work vehicle, it is detected whether or not the movable part is in contact with the pressurized object. Thereby, a pressurization target object can be held without changing.

  In a pressure booster for an aerial work vehicle, the amount of movement of the movable part is detected. Thereby, a pressurization target object can be held without changing.

  In a booster for an aerial work vehicle, the holding position is controlled based on the stored size of the pressurized object. Thereby, a pressurization target object can be held without changing.

  In a pressure booster for an aerial work vehicle, the impact when the movable part holds the object to be pressurized is reduced. Thereby, a pressurization target object can be held without changing.

The side view which shows the whole structure of the aerial work vehicle which concerns on one Embodiment of this invention. The figure which shows the hydraulic circuit of the pressure booster for high-altitude work vehicles which concerns on 3rd embodiment from 1st embodiment of this invention. The figure which shows the control structure of the pressure booster for high-altitude work vehicles which concerns on 1st embodiment of this invention. The process figure which shows the operation aspect of the hydraulic crimping tool connected to the pressure booster for high-altitude work vehicles which concerns on 1st embodiment of this invention. The figure which shows the operation | movement aspect of the hydraulic circuit at the time of temporary holding | maintenance operation in the intensifier for high work platforms which concerns on 1st embodiment of this invention, and 2nd embodiment. The figure which shows the measurement aspect of the distance measuring means of the hydraulic crimping tool connected to the pressure booster for high-altitude work vehicles which concerns on 1st embodiment of this invention. The figure which shows the flowchart showing the control aspect of the booster apparatus for high-altitude work vehicles which concern on 1st embodiment of this invention. The figure which shows the flowchart showing the control aspect of the booster apparatus for high-altitude work vehicles which concern on 1st embodiment of this invention. The figure which shows the flowchart showing the control aspect of the booster apparatus for high-altitude work vehicles which concern on 2nd embodiment of this invention. The figure which shows the flowchart showing the control aspect of the booster apparatus for high-altitude work vehicles which concerns on 3rd embodiment of this invention. The figure which shows the hydraulic circuit of the pressure booster for high-altitude work vehicles which concerns on 4th embodiment of this invention. The figure which shows the flowchart showing the control aspect of the booster apparatus for high-altitude work vehicles which concerns on 4th embodiment of this invention.

  Hereinafter, an aerial work vehicle 1 according to an embodiment of the aerial work vehicle will be described with reference to FIG. 1.

  As shown in FIG. 1, an aerial work vehicle 1 is used for electrical wiring work in which a power crimping tool 100 (see FIG. 2) is used to crimp a sleeve that is a pressurizing object to connect power lines. This is an aerial work vehicle. The aerial work vehicle 1 includes a vehicle 2 and an aerial work device 6.

  The vehicle 2 conveys the aerial work device 6. The vehicle 2 is provided with a cab 2b and a plurality of wheels 3 on a frame 2a, and an engine 4 (see FIG. 2) as a power source is mounted. The vehicle 2 is configured to travel by transmitting the driving force of the engine 4 to the plurality of wheels 3 in accordance with an operation from the cab 2b. The vehicle 2 is provided with an outrigger 5. The outrigger 5 includes a projecting beam that can be extended by hydraulic pressure on both sides in the width direction of the vehicle 2 and a hydraulic jack cylinder that can extend in a direction perpendicular to the ground. The vehicle 2 can extend the workable range of the aerial work vehicle 1 by extending the outrigger 5 in the width direction of the vehicle 2 and grounding the jack cylinder.

  The high place working device 6 lifts the bucket 9 on which the worker gets to a high place. The aerial work device 6 includes a swivel base 7, a telescopic boom 8, a bucket 9, a hoisting cylinder 10, and an operating device 11.

  The swivel base 7 swivels the aerial work device 6. The swivel base 7 is provided on the frame 2a of the vehicle 2 via an annular bearing. The annular bearing is arranged so that the center of rotation is perpendicular to the installation surface of the vehicle 2. The swivel base 7 is configured to be rotatable about the center of an annular bearing as a rotation center. The swivel base 7 is configured to be rotated by a hydraulic swivel motor (not shown).

  The telescopic boom 8 supports the bucket 9. The telescopic boom 8 is composed of a plurality of boom members. Each boom member is formed in a hollow cylindrical shape having polygonal cross sections similar to each other. Each boom member is formed in a size that can be inserted thereinto in the order of the cross-sectional area. The telescopic boom 8 is configured such that each boom member is movable in the axial direction. That is, the telescopic boom 8 is configured to be telescopic by moving each boom member with a telescopic cylinder (not shown). The telescopic boom 8 is provided so that the base end of the boom member can swing on the swivel base 7. Further, the telescopic boom 8 is configured to be swingable with respect to the swivel base 7 around the base end of the boom member.

  The bucket 9 is for securing a working space for the worker. The bucket 9 is configured so that an operator can get inside. The bucket 9 is supported at the tip of the telescopic boom 8 via a support mechanism 9a. The support mechanism 9a swings the bucket 9 in the elevation direction and the horizontal direction by a hydraulic actuator (not shown).

  The hoisting cylinder 10 raises and lowers the telescopic boom 8 and maintains the posture of the telescopic boom 8. The hoisting cylinder 10 is composed of a hydraulic cylinder. The base of the hoisting cylinder 10 is swingably connected to the swivel base 7, and the tip of the rod is swingably connected to the telescopic boom 8. The hoisting cylinder 10 raises or lowers the telescopic boom 8 by extending and contracting the rod.

  The operating device 11 is for operating the swivel base 7, the telescopic boom 8, the bucket 9, and the like. The operating device 11 is provided inside the vehicle 2 and the bucket 9. The operating device 11 is provided with a swivel telescopic operation tool for performing a swiveling operation of the swivel base 7 and a telescopic boom 8, a hoisting operation tool for performing a hoisting operation of the telescopic boom 8, an engine start switch, and the like. Further, the operating device 11 is provided with a hydraulic pressure switching operation tool 11a (see FIG. 3) for switching the hydraulic pressure of the hydraulic oil supplied to the hydraulic crimping tool 100. The hydraulic pressure switching operation tool 11 a switches to a state in which the hydraulic fluid increased in pressure can be supplied to the hydraulic crimping tool 100, or discharges hydraulic fluid from the hydraulic crimping tool 100.

  The aerial work vehicle 1 configured as described above can move the aerial work device 6 to an arbitrary position by running the vehicle 2. Further, the aerial work vehicle 1 is configured such that the telescopic boom 8 is raised at an arbitrary hoisting angle by the hoisting cylinder 10 and the telescopic boom 8 is extended to an arbitrary boom length to move the bucket 9 of the high altitude working device 6. Can be enlarged.

  Below, the pressure booster 12 which the aerial work vehicle 1 comprises is demonstrated using FIG. 2 and FIG.

  As shown in FIG. 2, the pressure booster 12 increases the hydraulic pressure of the hydraulic oil supplied to the hydraulic crimping tool 100. The pressure booster 12 includes a pressure-increasing cylinder 13, a pressure sensor 14, a preload electromagnetic switching valve (preload switching valve 17) that is a directional control valve, a relief valve 21, and a main pressure electromagnetic switching valve (a directional control valve). The main pressure switching valve 24), a pilot check valve 27, a hydraulic pump 28, and a control device 31 (see FIG. 3) are provided.

  The pressure increasing cylinder 13 increases the hydraulic pressure of the hydraulic oil. The pressure increasing cylinder 13 is constituted by a hydraulic cylinder including a bottomed cylindrical pressure increasing chamber 13a provided on the rod side. The pressure increasing cylinder 13 is configured such that the inner diameter of the pressure increasing chamber 13 a is smaller than the inner diameter of the pressure increasing cylinder 13. Inside the pressure increasing cylinder 13, a large-diameter piston 13d connected to a rod 13f is slidably inserted. Inside the pressure-increasing cylinder 13, a rod-side oil chamber 13b and a head-side oil chamber 13c are configured. A small-diameter piston 13e is slidably inserted in the pressure increasing chamber 13a. In the pressure increasing cylinder 13, a small diameter piston 13e in the pressure increasing chamber 13a and a large diameter piston 13d in the pressure increasing cylinder 13 are connected via a rod 13f. When the hydraulic oil is supplied to the head side oil chamber 13c of the pressure increasing cylinder 13, the pressure increasing cylinder 13 transmits the force generated in the large diameter piston 13d by the hydraulic pressure of the hydraulic oil to the small diameter piston 13e of the pressure increasing chamber 13a. . Thereby, the pressure increase cylinder 13 pressurizes the hydraulic oil in the pressure increase chamber 13a with the force increased by the area ratio of the large diameter piston 13d and the small diameter piston 13e.

  A pressure sensor 14 is connected to the pressure increasing chamber 13 a of the pressure increasing cylinder 13. The pressure sensor 14 can detect the hydraulic pressure of the hydraulic oil in the pressure increasing chamber 13a in real time. The pressure sensor 14 is connected to the control device 31. A supply oil passage 15 is connected to the pressure increasing chamber 13 a of the pressure increasing cylinder 13. The supply oil passage 15 is provided with a joint 16 to which the hydraulic crimping tool 100 can be connected. As a result, the pressure increasing device 12 is configured to be able to supply the hydraulic pressure increased in the pressure increasing chamber 13 a of the pressure increasing cylinder 13 to the hydraulic pressure bonding tool 100 connected to the joint 16 through the supply oil passage 15. .

  An electromagnetic switching valve for preload (hereinafter simply referred to as “preload switching valve 17”) which is a directional control valve is a supply in which a pressure increasing chamber 13a of a pressure increasing cylinder 13 and a hydraulic pressure bonding tool 100 are connected to each other. The direction of the hydraulic oil supplied to the oil passage 15 is switched. A supply oil passage 15 is connected to one port of the preload switching valve 17 via a low pressure oil passage 18. A supply oil passage 15 is connected to the other port of the preload switching valve 17 via a preload oil passage 19. A hydraulic pump 28 is connected to the supply port of the preload switching valve 17 via the discharge oil passage 20. That is, hydraulic oil is supplied to the preload switching valve 17 at the discharge pressure of the hydraulic pump 28 (hereinafter simply referred to as “preload”). In the preload switching valve 17, one of the one port and the other port is communicated with the supply port by moving a spool (not shown) by an electromagnet.

  A relief valve 21 is connected to the low pressure oil passage 18 connected to one port of the preload switching valve 17 to control the hydraulic pressure of the hydraulic oil below a set value. In the relief valve 21, a branch oil passage branched from the low pressure oil passage 18 is connected to an inlet port, and a hydraulic oil tank 30 is connected to an outlet port. Further, the low-pressure oil passage 18 is provided with a throttle 22 on the upstream side of the branch oil passage of the relief valve 21 and a check valve 23 on the downstream side. When the hydraulic pressure of the hydraulic oil flowing through the low pressure oil passage 18 reaches a set value, the relief valve 21 returns a part of the hydraulic oil flowing through the low pressure oil passage 18 to the hydraulic oil tank 30 through the branch oil passage. That is, the hydraulic pressure of the hydraulic oil flowing through the low-pressure oil passage 18 is controlled by the relief valve 21 to a relief pressure lower than the preload (hereinafter simply referred to as “low pressure”). Further, the flow rate of the hydraulic oil flowing through the low pressure oil passage 18 is limited by the throttle 22 to be equal to or less than the relief flow rate of the relief valve 21. A check valve 23 is provided in the preload oil passage 19. The preload switching valve 17 is connected to the control device 31.

  The preload switching valve 17 is in a state where the low pressure oil passage 18 and the preload oil passage 19 are connected to the hydraulic oil tank 30 when the electromagnet is not excited (when no operation signal is received from the control device 31). The spool is moved to the II position. That is, the preload switching valve 17 is switched to a state where the hydraulic oil discharged from the hydraulic pump 28 is not supplied to the supply oil passage 15. As a result, the pressure increasing device 12 does not supply hydraulic oil to the pressure increasing chamber 13 a of the pressure increasing cylinder 13 and the hydraulic pressure bonding tool 100 through the supply oil passage 15.

  When the electromagnet is excited so that one port communicates with the supply port (when an operation signal for supplying low-pressure hydraulic oil is received from the control device 31), the preload switching valve 17 has a low-pressure oil passage. The spool is moved to the I position where 18 is connected to the discharge oil passage 20 and the preload oil passage 19 is connected to the hydraulic oil tank 30. That is, the preload switching valve 17 is switched to a state in which hydraulic oil is supplied to the supply oil passage 15 through the low pressure oil passage 18. As a result, the pressure booster 12 supplies low-pressure hydraulic oil to the pressure boosting chamber 13 a of the pressure boosting cylinder 13 and the hydraulic pressure bonding tool 100 through the supply oil passage 15. At this time, the flow rate of the hydraulic oil supplied to the pressure increasing chamber 13 a of the pressure increasing cylinder 13 and the hydraulic pressure bonding tool 100 is limited by the throttle 22 of the low pressure oil passage 18.

  When the electromagnet is excited so that the other port and the supply port communicate with each other, the preload switching valve 17 has a preload oil passage (when an operation signal for supplying preload hydraulic fluid is received from the control device 31). The spool is moved to a position III where 19 is connected to the discharge oil passage 20 and the low-pressure oil passage 18 is connected to the hydraulic oil tank 30. That is, the preload switching valve 17 is switched to a state in which the working oil is supplied to the supply oil passage 15 through the preload oil passage 19. Thereby, the pressure booster 12 supplies the preload hydraulic fluid to the pressure boosting chamber 13 a of the pressure boosting cylinder 13 and the hydraulic pressure bonding tool 100 through the supply oil passage 15.

  A main pressure electromagnetic switching valve (hereinafter simply referred to as “main pressure switching valve 24”), which is a directional control valve, switches the direction of hydraulic fluid supplied to the pressure increasing cylinder 13. The rod side oil chamber 13 b of the pressure increasing cylinder 13 is connected to one port of the main pressure switching valve 24 via a pressure reducing oil passage 25. A head side oil chamber 13 c of the pressure increasing cylinder 13 is connected to the other port of the main pressure switching valve 24 via a pressure increasing oil passage 26. A hydraulic pump 28 is connected to the supply port of the main pressure switching valve 24 via the discharge oil passage 20. That is, the hydraulic oil is supplied to the main pressure switching valve 24 with a preload. In the main pressure switching valve 24, one of the one port and the other port is communicated with the supply port when a spool (not shown) is moved by an electromagnet. The main pressure switching valve 24 is connected to the control device 31.

  When the electromagnet is not excited (when no operation signal is received from the control device 31), the main pressure switching valve 24 is in a state where the pressure reducing oil passage 25 and the pressure increasing oil passage 26 are connected to the hydraulic oil tank 30. The spool is moved to a certain II position. That is, the main pressure switching valve 24 is switched to a state where the hydraulic oil discharged from the hydraulic pump 28 is not supplied to the pressure increasing cylinder 13. Thereby, the pressure booster 12 does not increase the hydraulic pressure of the hydraulic oil by the pressure boosting cylinder 13.

  When the electromagnet is excited so that one port communicates with the supply port (when receiving an operation signal for reducing the hydraulic oil pressure from the control device 31), the main pressure switching valve 24 has a reduced pressure oil passage. The spool is moved to the I position where 25 is connected to the discharge oil passage 20 and the pressure-increasing oil passage 26 is connected to the hydraulic oil tank 30. That is, the main pressure switching valve 24 is switched to a state where hydraulic oil is supplied to the rod side oil chamber 13 b of the pressure increasing cylinder 13 through the pressure reducing oil passage 25. Thereby, the pressure booster 12 moves the small-diameter piston 13e in the direction in which the volume of the pressure boosting chamber 13a increases to reduce the hydraulic pressure of the hydraulic oil.

  When the electromagnet is excited so that the other port and the supply port communicate with each other, the main pressure switching valve 24 increases pressure oil (when receiving an operation signal for increasing the hydraulic pressure of the hydraulic oil from the control device 31). The spool is moved to the position III where the passage 26 is connected to the discharge oil passage 20 and the decompression oil passage 25 is connected to the hydraulic oil tank 30. That is, the main pressure switching valve 24 is switched to a state in which hydraulic oil is supplied to the head side oil chamber 13 c of the pressure increasing cylinder 13 through the pressure increasing oil passage 26. Thereby, the pressure booster 12 moves the small diameter piston 13e in the direction in which the volume of the pressure increasing chamber 13a decreases, and increases the hydraulic pressure of the hydraulic oil.

  The pilot type check valve 27 releases the oil passage. In the pilot type check valve 27, the supply oil passage 15 is connected to the inlet port, and the hydraulic oil tank 30 is connected to the outlet port. The pilot check valve 27 is configured so that pilot hydraulic oil is supplied from the decompression oil passage 25. When the main pressure switching valve 24 is switched to supply hydraulic oil to the rod side oil chamber 13 b of the pressure increasing cylinder 13, the pilot check valve 27 is opened when pilot hydraulic oil is supplied from the pressure reducing oil passage 25. I speak. The hydraulic oil in the pressure increasing chamber 13a connected to the supply oil passage 15 and the hydraulic oil in the hydraulic pressure bonding tool 100 are returned to the hydraulic oil tank 30 through the pilot check valve 27. Thereby, the pressure booster 12 is comprised so that the hydraulic oil in the pressure increase chamber 13a and the hydraulic oil in the hydraulic crimping tool 100 can be quickly discharged.

  The hydraulic pump 28 discharges hydraulic oil at a predetermined discharge pressure. The hydraulic pump 28 is driven by the engine 4. A preload switching valve 17 and a main pressure switching valve 24 are connected to the hydraulic pump 28 in parallel. The hydraulic oil discharged from the hydraulic pump 28 is supplied to the preload switching valve 17 and the main pressure switching valve 24 through the discharge oil passage 20. A hydraulic pump relief valve 29 is provided in the discharge oil passage 20. The hydraulic pump relief valve 29 controls the hydraulic pressure of the hydraulic oil discharged from the hydraulic pump 28 to a set value or less.

  As shown in FIG. 3, the control device 31 controls the operations of the preload switching valve 17 and the main pressure switching valve 24 of the pressure increasing device 12. The control device 31 may actually have a configuration in which a CPU, a ROM, a RAM, an HDD, and the like are connected by a bus, or may be configured by a one-chip LSI or the like. The control device 31 stores various programs and data for controlling the operations of the preload switching valve 17 and the main pressure switching valve 24. The control device 31 is provided in the vehicle 2.

  The control device 31 is connected to the hydraulic pressure switching operation tool 11a, and can acquire an operation signal from the hydraulic pressure switching operation tool 11a.

  The control device 31 is connected to the pressure sensor 14 of the pressure increasing chamber 13a, and can acquire the detected value of the hydraulic oil pressure in the pressure increasing chamber 13a detected by the pressure sensor 14.

  The control device 31 is connected to the preload switching valve 17 and can selectively excite the electromagnet of the preload switching valve 17 to change the position of the spool of the preload switching valve 17.

  The control device 31 is connected to the main pressure switching valve 24 and can selectively excite the electromagnet of the main pressure switching valve 24 to change the position of the spool of the main pressure switching valve 24.

  The control device 31 is connected to the tool operation tool 100c of the hydraulic crimping tool 100 via the connector 31a, and can obtain an operation signal from the hydraulic crimping tool 100.

  In the present embodiment, the pressure increasing cylinder 13 of the pressure increasing device 12 of the aerial work vehicle 1, the preload switching valve 17, the relief valve 21, the main pressure switching valve 24, the pilot check valve 27, the hydraulic pump 28 and the control. The device 31 is provided in the vehicle 2 of the aerial work vehicle 1. In the pressure increasing device 12, a hydraulic hose constituting the supply oil passage 15 is piped to the bucket 9 via the telescopic boom 8. A joint 16 for connecting a hydraulic crimping tool or the like is provided at the tip of the hydraulic hose.

  Next, the displacement sensor 100d provided in the hydraulic pressure bonding tool 100 will be described with reference to FIG.

  As shown in FIG. 2, the movable part 100a is provided with a displacement sensor 100d as a distance measuring means.

  The displacement sensor 100d detects the distance between the movable part 100a and the sleeve S in a non-contact manner using various laser beams. The displacement sensor 100d is connected to the control device 31 via a connector 31a (see FIG. 3). The detection value of the displacement sensor 100d is transmitted to the control device 31 as an operation signal. In the present embodiment, the displacement sensor 100d is configured by using a laser beam, but is not limited thereto, and may be configured by using an ultrasonic wave or an eddy current.

  Next, the operation mode of the pressure increasing device 12 in the caulking operation of the sleeve S for electric wiring by the hydraulic crimping tool 100 will be described with reference to FIGS. In the present embodiment, the hydraulic pressure bonding tool 100 is connected to the joint 16 and the tool operating tool 100c of the hydraulic pressure bonding tool 100 is connected to the control device 31 via the connector 31a (see FIG. 3). It is assumed that

  As shown in FIG. 4, the hydraulic crimping tool 100 connected to the pressure booster 12 holds and crimps a sleeve S for electrical wiring. The hydraulic crimping tool 100 is configured such that the movable part 100a moves toward the receiving part 100b by the hydraulic oil supplied from the pressure intensifying device 12. The hydraulic crimping tool 100 is in a stopped state s0 in which the movable part 100a is stopped by the operation of the tool operating tool 100c, and the movable part 100a is moved toward the receiving part 100b to move the sleeve S between the movable part 100a and the receiving part 100b. And the temporary holding operation s1 to hold, the preload stage s2 of the main compression operation in which the movable portion 100a is pressed with a predetermined force to preload the sleeve S, and the movable portion 100a is pressed with a predetermined force to move the sleeve S. A main pressure stage s3 of the main compression operation to be caulked and a return operation s4 in which the movable portion 100a is moved away from the receiving portion 100b to release the sleeve S can be performed.

  As shown in FIG. 2, when the operation mode of the hydraulic crimping tool 100 is switched to the stop state s0 by operating the tool operating tool 100c, the control device 31 sets the spool position of the preload switching valve 17 to the low pressure oil passage. 18 and the preload oil passage 19 are moved to the II position where the hydraulic oil tank 30 is connected. In addition, the control device 31 moves the spool position of the main pressure switching valve 24 to the II position where the pressure reducing oil passage 25 and the pressure increasing oil passage 26 are connected to the hydraulic oil tank 30. That is, the pressure booster 12 does not supply hydraulic oil to the hydraulic crimping tool 100. Thereby, the hydraulic crimping tool 100 stops in a state where the movable portion 100a is separated from the receiving portion 100b (a state where the sleeve S is released).

  As shown in FIG. 5, when the operation mode of the hydraulic crimping tool 100 is switched to the temporary holding operation s1 by the operation of the tool operating tool 100c, the control device 31 sets the spool position of the preload switching valve 17 to the low pressure oil. The passage 18 is connected to the discharge oil passage 20 and moved to the I position where the preload oil passage 19 is connected to the hydraulic oil tank 30. In addition, the control device 31 moves the spool position of the main pressure switching valve 24 to the II position where the pressure reducing oil passage 25 and the pressure increasing oil passage 26 are connected to the hydraulic oil tank 30. That is, the pressure booster 12 controls the hydraulic oil whose hydraulic pressure is controlled to a low pressure by the relief valve 21 and whose flow rate is controlled to be equal to or lower than the relief flow rate by the throttle 22, the pressure increasing chamber 13 a of the pressure increasing cylinder 13 and the hydraulic pressure bonding tool 100. (Refer to the thin ink section). Accordingly, in the hydraulic crimping tool 100, the movable portion 100a is moved toward the receiving portion 100b, and the sleeve S is held by the movable portion 100a and the receiving portion 100b (see the black arrow). At the same time, the pressure intensifying device 12 discharges air in the pressure intensifying chamber 13a, the hydraulic pressure bonding tool 100, and the supply oil passage 15 by supplying low-pressure hydraulic oil.

  As shown in FIG. 2, when the operation mode of the hydraulic crimping tool 100 is switched to the main compression operation by operating the tool operating tool 100c, the control device 31 sets the spool position of the preload switching valve 17 to the preload oil passage. 19 is connected to the discharge oil passage 20 and moved to a position III where the low-pressure oil passage 18 is connected to the hydraulic oil tank 30. In addition, the control device 31 moves the spool position of the main pressure switching valve 24 to the II position where the pressure reducing oil passage 25 and the pressure increasing oil passage 26 are connected to the hydraulic oil tank 30. Accordingly, the hydraulic crimping tool 100 applies a preload to the sleeve S by pressing the movable portion 100a with a predetermined force by the pre-pressurized hydraulic oil that has not been increased as a pre-load stage s2 of the main compression operation.

  In the preload stage s2 of the main compression operation, when the detected value of the pressure sensor 14 reaches the preload reference value, the control device 31 operates the spool position of the preload switching valve 17 so that the low pressure oil passage 18 and the preload oil passage 19 operate. It is moved to the II position where it is connected to the oil tank 30. At the same time, the control device 31 moves the spool position of the main pressure switching valve 24 to the position III where the pressure increasing oil passage 26 is connected to the discharge oil passage 20 and the pressure reducing oil passage 25 is connected to the hydraulic oil tank 30. Move. As a result, the hydraulic crimping tool 100 presses the movable portion 100a with a predetermined force by the hydraulic oil increased in pressure by the pressure-increasing cylinder 13 as the main pressure stage s3 of the main compression operation, and crimps the sleeve S.

  When the operation mode of the hydraulic crimping tool 100 is switched to the return operation s4 by the operation of the tool operating tool 100c, the control device 31 sets the spool position of the preload switching valve 17 to the low pressure oil path 18, the preload oil path 19, and Is moved to the II position where it is connected to the hydraulic oil tank 30. At the same time, the control device 31 moves the spool position of the main pressure switching valve 24 to the I position where the pressure reducing oil passage 25 is connected to the discharge oil passage 20 and the pressure increasing oil passage 26 is connected to the hydraulic oil tank 30. Move. As a result, the hydraulic crimping tool 100 is moved in a direction in which the movable portion 100a is separated from the receiving portion 100b to release the sleeve S from the movable portion 100a and the receiving portion 100b.

  Next, the control mode of the pressure booster 12 in the caulking operation of the electrical wiring sleeve S by the hydraulic crimping tool 100 will be described with reference to FIGS. In the following control mode, it is assumed that the hydraulic pressure bonding tool 100 is connected to the joint 16 in the pressure increasing device 12. The stop reference value X that appears below is the distance between the sleeve S that serves as a reference for stopping the movable part 100a and the movable part 100a. The predetermined time T described below is a time for the movable portion 100a to move toward the receiving portion 100b after reaching the stop reference value X in order to hold the sleeve S reliably.

  As shown in FIG. 6, when the movable part 100a is moved toward the receiving part 100b at the time of the temporary holding operation s1 (see FIG. 4), the displacement sensor 100d has a distance D between the movable part 100a and the sleeve S. Is detected. When the movable portion 100a is moved toward the receiving portion 100b and a predetermined time T has elapsed after the displacement sensor 100d detects the stop reference value X, that is, the distance D between the movable portion 100a and the sleeve S and the stop reference. When the predetermined time T has elapsed after the value X becomes equal, the control device 31 sets the spool position of the preload switching valve 17 in a state where the low pressure oil passage 18 and the preload oil passage 19 are connected to the hydraulic oil tank 30. Move to a certain II position. That is, the pressure booster 12 does not supply hydraulic oil to the hydraulic crimping tool 100. Thereby, the hydraulic crimping tool 100 stops in a state where the movable portion 100a holds the sleeve S with a constant force.

  As shown in FIG. 7, in step S <b> 110, the controller 31 connects the preload switching valve 17 with the spool position of the low pressure oil passage 18 connected to the discharge oil passage 20 and the preload oil passage 19 connected to the hydraulic oil tank 30. The spool is moved to the I position which is in a state of being At the same time, the control device 31 moves the spool position of the main pressure switching valve 24 to the II position where the pressure reducing oil passage 25 and the pressure increasing oil passage 26 are connected to the hydraulic oil tank 30, and step S121 is performed. (See FIG. 8).

As shown in FIG. 8, in step S121, the control device 31 determines whether or not the displacement sensor 100d has detected the stop reference value X.
As a result, when it is determined that the displacement sensor 100d has detected the stop reference value X, the control device 31 shifts the step to step S122.
On the other hand, when it determines with the displacement sensor 100d not detecting the stop reference value X, the control apparatus 31 makes a step transfer to step S121.

In step S122, the control device 31 determines whether or not a predetermined time T has elapsed.
As a result, when it is determined that the predetermined time T has elapsed, the control device 31 shifts the step to step S123.
On the other hand, when it determines with predetermined time T not having passed, the control apparatus 31 makes a step transfer to step S122.

  In step S123, the control device 31 moves the spool position of the preload switching valve 17 to the II position where the low pressure oil passage 18 and the preload oil passage 19 are connected to the hydraulic oil tank 30, and the step is performed in step S140. (See FIG. 7).

As shown in FIG. 7, in step S140, it is determined whether or not the operation mode of the hydraulic crimping tool 100 has been switched to the main compression operation by the operation of the tool operating tool 100c.
As a result, when it is determined that the operation mode of the hydraulic crimping tool 100 is switched to the main compression operation by the operation of the tool operating tool 100c, the control device 31 shifts the step to step S150.
On the other hand, when it is determined that the operation mode of the hydraulic crimping tool 100 is not switched to the main compression operation by the operation of the tool operating tool 100c, the control device 31 shifts the step to Step S200.

  In step S150, the control device 31 moves the preload oil passage 19 to the position III where the preload oil passage 19 is connected to the discharge oil passage 20 and the low pressure oil passage 18 is connected to the hydraulic oil tank 30. At the same time, the control device 31 moves the spool position of the main pressure switching valve 24 to the II position where the pressure reducing oil passage 25 and the pressure increasing oil passage 26 are connected to the hydraulic oil tank 30, and step S160 is performed. To migrate.

In step S160, the control device 31 determines whether or not the detected value of the pressure sensor 14 is greater than or equal to the preload reference value.
As a result, when it is determined that the detected value of the pressure sensor 14 is equal to or greater than the preload reference value, the control device 31 shifts the step to step S170.
On the other hand, when it determines with the detected value of the pressure sensor 14 being less than a preload reference value, the control apparatus 31 makes a step transfer to step S160.

  In step S <b> 170, the control device 31 moves the spool position of the preload switching valve 17 to the II position where the low pressure oil passage 18 and the preload oil passage 19 are connected to the hydraulic oil tank 30. At the same time, the control device 31 moves the spool position of the main pressure switching valve 24 to the position III where the pressure increasing oil passage 26 is connected to the discharge oil passage 20 and the pressure reducing oil passage 25 is connected to the hydraulic oil tank 30. Move to step S180.

In step S180, the control device 31 determines whether or not the detected value of the pressure sensor 14 is greater than or equal to the main pressure reference value.
As a result, when it is determined that the detected value of the pressure sensor 14 is equal to or higher than the main pressure reference value, the control device 31 shifts the step to step S190.
On the other hand, when it is determined that the detected value of the pressure sensor 14 is less than the main pressure reference value, the control device 31 shifts the step to step S180.

  In step S190, the control device 31 moves the spool position of the preload switching valve 17 to the II position where the low pressure oil passage 18 and the preload oil passage 19 are connected to the hydraulic oil tank 30. At the same time, the control device 31 moves the spool position of the main pressure switching valve 24 to the I position where the pressure reducing oil passage 25 is connected to the discharge oil passage 20 and the pressure increasing oil passage 26 is connected to the hydraulic oil tank 30. The control of the pressure booster 32 is terminated.

In step S200, the control device 31 determines whether or not the operation mode of the hydraulic crimping tool 100 has been switched to the return operation s4 by the operation of the tool operation tool 100c.
As a result, when it is determined that the operation mode of the hydraulic crimping tool 100 is switched to the return operation s4 by the operation of the tool operating tool 100c, the control device 31 shifts the step to step S190.
On the other hand, when it is determined that the operation mode of the hydraulic crimping tool 100 is not switched to the return operation s4 by the operation of the tool operating tool 100c, the control device 31 shifts the step to step S140.

  With this configuration, the pressure increasing device 12 is configured so that, when the predetermined time T has elapsed since the distance between the movable portion 100a and the sleeve S reaches the stop reference value X during the temporary holding operation s1, the preload switching valve 17 is used. Is switched to a state where hydraulic oil is not supplied to the hydraulic crimping tool. Therefore, the pressure increasing device 12 can detect whether or not the movable portion 100a is in contact with the sleeve S, and can control the position of the movable portion to hold the sleeve S without being deformed.

  Next, the booster 32 for an aerial work vehicle, which is a second embodiment of the booster 12 for an aerial work vehicle, will be described with reference to FIGS. 2, 5, and 9. Note that the pressure booster 32 for an aerial work vehicle according to the following embodiment uses the names, figure numbers, and symbols used in the description of the booster 32 for an aerial work vehicle shown in FIGS. 3 to 8. In the following embodiments, the same points as those of the above-described embodiments will be omitted, and different portions will be mainly described.

  As shown in FIG. 2, the pressure increasing device 32 includes a pressure increasing cylinder 13, a pressure sensor 14, a preload switching valve 17, a relief valve 21, a main pressure switching valve 24, a pilot check valve 27, a hydraulic pump 28, and a control device. 31 is provided.

  Next, an operation mode of the pressure increasing device 32 in the caulking operation of the sleeve S for electric wiring by the hydraulic crimping tool 100 will be described with reference to FIG. The predetermined speed V that appears below is a speed at which the movable part 100a determines that the movable part 100a has come into contact with the sleeve S and decelerated.

  As shown in FIG. 5, the displacement sensor 100d is provided in the movable part 100a, differentiates the detected value of the distance between the movable part 100a and the sleeve S, and acquires the speed of the movable part.

  When the movable portion 100a is moved toward the receiving portion 100b during the temporary holding operation s1 (see FIG. 4), the control device 31 determines the preload switching valve based on the speed of the movable portion 100a detected by the displacement sensor 100d. 17 is controlled. When the speed of the movable part 100a becomes equal to or lower than the predetermined speed V, after the predetermined time T has elapsed, the control device 31 operates the spool position of the preload switching valve 17 in the low pressure oil path 18 and the preload oil path 19. It is moved to the II position where it is connected to the oil tank 30. That is, the pressure increasing device 32 does not supply hydraulic oil to the hydraulic pressure bonding tool 100. Accordingly, in the hydraulic pressure bonding tool 100, the movable portion 100a is stopped at the predetermined holding position and holds the sleeve S.

  With this configuration, when the speed of the movable unit 100a is equal to or lower than the predetermined speed V during the temporary holding operation s1, the preload switching valve 17 is configured to be a hydraulic pressure bonding tool 17 after a predetermined time T has elapsed. Is switched to a state in which no hydraulic oil is supplied. Therefore, the pressure increasing device 32 can hold the sleeve S without deforming it by controlling the position of the movable portion 100a based on the speed of the movable portion 100a.

  Next, a control mode of the pressure booster 32 in the caulking operation of the sleeve S for electric wiring by the hydraulic crimping tool 100 will be described with reference to FIG.

As shown in FIG. 9, in step S124, the control device 31 determines whether or not the speed of the movable part 100a detected by the displacement sensor 100d is equal to or lower than a predetermined speed V.
As a result, when it is determined that the speed of the movable part 100a detected by the displacement sensor 100d is equal to or less than the predetermined speed V, the control device 31 shifts the step to step S122.
On the other hand, when it is determined that the speed of the movable part 100a detected by the displacement sensor 100d is greater than the predetermined speed V, the control device 31 shifts the step to step S124.

In step S122, the control device 31 determines whether or not a predetermined time T has elapsed.
As a result, when it is determined that the predetermined time T has elapsed, the control device 31 shifts the step to step S123.
On the other hand, when it determines with predetermined time T not having passed, the control apparatus 31 makes a step transfer to step S122.

  In step S123, the control device 31 moves the spool position of the preload switching valve 17 to the II position where the low pressure oil passage 18 and the preload oil passage 19 are connected to the hydraulic oil tank 30, and the step is performed in step S140. (See FIG. 7).

  As another embodiment of the pressure booster 12 for an aerial work vehicle, the hydraulic pressure bonding tool 100 may be provided with a stroke sensor 100e instead of the displacement sensor 100d. The stroke sensor 100e detects the movement amount and speed of the movable part 100a. The pressure increasing device 33 is configured such that the control device 31 can acquire the detection value of the stroke sensor 100e via a connector 31a which is a hydraulic pressure acquisition means.

  With this configuration, when the stroke sensor 100e detects the stop reference value X or when the speed of the movable part 100a is equal to or lower than the predetermined speed V, the pressure increasing device 33 is configured so that the preload switching valve 17 is It is switched to a state where hydraulic oil is not supplied to the hydraulic crimping tool. Therefore, the pressure increasing device 33 can hold the sleeve S without deforming it by controlling the position of the movable portion 100a based on the moving amount or speed of the movable portion 100a.

  In addition, after the speed of the movable part 100a becomes equal to or less than the predetermined speed V, the speed of the movable part 100a increases and reaches a limit value (a reference value for performing the return operation in order to stop the progress of plastic deformation of the sleeve S). The hydraulic oil in the hydraulic pressure bonding tool 100 is discharged to the hydraulic oil tank 30, and the movable part 100a is moved away from the receiving part 100b to receive the sleeve S with the movable part 100a. It may be configured to be released from the part 100b. When releasing the sleeve S from the movable portion 100a and the receiving portion 100b, the control device 31 performs the same control as the return operation s4 (see FIG. 4) on the preload switching valve 17 and the main pressure switching valve 24.

  With this configuration, the pressure increasing device 33 can detect that the movable portion 100a is moving without stopping at the holding position due to plastic deformation or the like of the sleeve S based on the speed of the movable portion 100a. . Accordingly, when the sleeve S is plastically deformed, the pressure intensifying device 33 can stop the progress based on the speed of the movable portion 100a.

  Next, the booster 34 for an aerial work vehicle, which is a third embodiment of the booster 12 for an aerial work vehicle, will be described with reference to FIGS. 2 and 10.

  As shown in FIG. 2, the pressure increasing device 34 includes a pressure increasing cylinder 13, a pressure sensor 14, a preload switching valve 17, a relief valve 21, a main pressure switching valve 24, a pilot check valve 27, a hydraulic pump 28, and a control device. 31 is provided.

  The stroke sensor 100e is provided in the movable part 100a, and detects the movement amount of the movable part 100a.

  When the movable portion 100a is moved toward the receiving portion 100b during the temporary holding operation s1 (see FIG. 4), the control device 31 controls the preload switching valve 17 based on the detection value of the stroke sensor 100e. When holding one sleeve S, the control device 31 stores the detection value of the stroke sensor 100e. When the hydraulic crimping tool 100 holds another sleeve S of the same size as the one sleeve S or the same sleeve S, the detected value when the one sleeve is held is set as a stop reference value Y, and the sleeve S is Hold. When the stroke sensor 100e detects the stop reference value Y, the control device 31 is in a state where the low pressure oil passage 18 and the preload oil passage 19 are connected to the hydraulic oil tank 30 at the spool position of the preload switching valve 17. Move to position. That is, the pressure increasing device 34 does not supply hydraulic oil to the hydraulic pressure bonding tool 100. Accordingly, in the hydraulic pressure bonding tool 100, the movable portion 100a is stopped at the predetermined holding position and holds the sleeve S.

  With this configuration, the pressure increasing device 34 is controlled in its holding position based on the stored size of the pressurized object. Therefore, the pressure increasing device 34 can hold the sleeve S without deforming it by controlling the position of the movable portion 100a.

  Next, the control mode of the pressure booster 34 in the caulking operation of the sleeve S for electric wiring by the hydraulic crimping tool 100 will be described with reference to FIG.

As shown in FIG. 10, in step S131, the control device 31 determines whether or not the stop reference value Y of the stroke sensor 100e has been detected.
As a result, when it is determined that the stroke sensor 100e has detected the stop reference value Y, the control device 31 shifts the step to step S132.
On the other hand, when it is determined that the stroke sensor 100e has not detected the stop reference value Y, the control device 31 shifts the step to step S131.

  In step S132, the control device 31 moves the spool position of the preload switching valve 17 to the II position where the low pressure oil passage 18 and the preload oil passage 19 are connected to the hydraulic oil tank 30, and step 140 is performed. (See FIG. 7).

  Next, a booster 35 for an aerial work vehicle, which is a fourth embodiment of the booster 12 for an aerial work vehicle, will be described with reference to FIGS. 11 and 12.

  As shown in FIG. 11, the pressure increasing device 35 includes a pressure increasing cylinder 13, a pressure sensor 14, a proportional control valve 36, a relief valve 21, a main pressure switching valve 24, a pilot check valve 27, a hydraulic pump 28, and a control device 31. Is provided.

  The proportional control valve 36 switches the direction of the hydraulic oil supplied to the supply oil passage 15 to which the pressure increasing chamber 13a of the pressure increasing cylinder 13 and the hydraulic pressure bonding tool 100 are connected, and the flow rate of the hydraulic oil is changed. It is something to control. A supply oil passage 15 is connected to one port of the proportional control valve 36 via a low-pressure oil passage 18. A supply oil passage 15 is connected to the other port of the proportional control valve 36 via a preload oil passage 19. A hydraulic pump 28 is connected to the supply port of the proportional control valve 36 via the discharge oil passage 20. That is, hydraulic oil is supplied to the proportional control valve 36 with the preload of the hydraulic pump 28. In the proportional control valve 36, a spool (not shown) is moved by an electromagnet, so that one of the one port and the other port communicates with the supply port.

  The proportional control valve 36 is in a state where the low pressure oil passage 18 and the preload oil passage 19 are connected to the hydraulic oil tank 30 when the electromagnet is not excited (when no operation signal is received from the control device 31). The spool is moved to the position. That is, the proportional control valve 36 is switched to a state where the hydraulic oil discharged from the hydraulic pump 28 is not supplied to the supply oil passage 15. As a result, the pressure increasing device 35 does not supply hydraulic oil to the pressure increasing chamber 13 a of the pressure increasing cylinder 13 and the hydraulic pressure bonding tool 100 through the supply oil passage 15.

  When the electromagnet is excited, the proportional control valve 36 is in a state where the low pressure oil passage 18 is connected to the discharge oil passage 20 and the preload oil passage 19 is connected to the hydraulic oil tank 30 based on the magnitude of the input current. The spool is moved to the I position. That is, the opening degree of the spool of the proportional control valve 36 is adjusted based on the magnitude of the input current. As a result, the pressure increasing device 35 supplies low pressure hydraulic oil whose flow rate is controlled to the pressure increasing chamber 13 a of the pressure increasing cylinder 13 and the hydraulic pressure bonding tool 100 through the supply oil passage 15.

  Next, the aspect which controls the proportional control valve 36 based on the distance between the movable part 100a and the sleeve S in the pressure increasing device 35 is demonstrated using FIG. The control device 31 controls the spool position of the proportional control valve 36 based on the detection value from the displacement sensor 100d. The deceleration reference value Z that appears below is the position of the movable part at which the movable part 100a starts to decelerate.

  As shown in FIG. 11, when the movable part 100a is moved toward the receiving part 100b during the temporary holding operation s1 (see FIG. 4), the control device 31 determines whether or not the deceleration reference value Z is detected. To do. When the displacement sensor 100d detects the deceleration reference value Z, the control device 31 controls the spool position of the proportional control valve 36 to reduce the flow rate of hydraulic oil supplied to the hydraulic crimping tool 100 and decelerate the movable part 100a. Let When the movable part 100a is decelerated, the control device 31 determines whether or not the displacement sensor 100d has detected a stop reference value. When the stop reference value is detected, the control device 31 switches the proportional control valve 36 to a state where hydraulic oil is not supplied to the hydraulic crimping tool after the predetermined time T has elapsed, and stops the movable portion 100a. When the stop reference value X is not detected, the control device 31 determines whether or not the deceleration reference value Z is detected.

  Next, the control mode of the pressure increasing device 35 in the caulking operation of the sleeve S for electric wiring by the hydraulic crimping tool 100 will be described with reference to FIG.

As shown in FIG. 12, in step S125, the control device 31 determines whether or not the displacement sensor 100d has detected a deceleration reference value Z.
As a result, when it is determined that the displacement sensor 100d has detected the deceleration reference value Z, the control device 31 shifts the step to step S126.
On the other hand, when it is determined that the displacement sensor 100d has not detected the deceleration reference value Z, the control device 31 shifts the step to step S125.

  In step S126, the control device 31 sets the spool position of the proportional control valve 36 based on the magnitude of the input current to the II position direction in which the low pressure oil passage 18 and the preload oil passage 19 are connected to the hydraulic oil tank 30. And the process proceeds to step S121.

In step S121, the control device 31 determines whether or not the displacement sensor 100d has detected the stop reference value X.
As a result, when it is determined that the displacement sensor 100d has detected the stop reference value X, the control device 31 shifts the step to step S122.
On the other hand, when it determines with the displacement sensor 100d not detecting the stop reference value X, the control apparatus 31 makes a step transfer to step S125.

In step S122, the control device 31 determines whether or not a predetermined time T has elapsed.
As a result, when it is determined that the predetermined time T has elapsed, the control device 31 shifts the step to step S123.
On the other hand, when it determines with predetermined time T not having passed, the control apparatus 31 makes a step transfer to step S122.

  In step S123, the control device 31 moves the spool position of the proportional control valve 36 to the II position where the low pressure oil passage 18 and the preload oil passage 19 are connected to the hydraulic oil tank 30, and the step is performed in step S140 (step S140). (See FIG. 7).

  With this configuration, the pressure increasing device 35 mitigates the impact when the movable part holds the pressurization target based on the detection value of the displacement sensor. Therefore, the pressure increasing device 35 can hold the sleeve S without deforming it by controlling the position of the movable portion 100a.

  As described above, in the pressure booster 12, 32, 33, 34, 35 of the aerial work vehicle 1, the distance measuring means is the displacement sensor 100d and the stroke sensor 100e. It is not limited, and it is sufficient if the distance between the movable part 100a and the object to be pressed can be measured. Moreover, although the case where the sleeve S was hold | maintained was demonstrated, it is not limited to the sleeve S, What is necessary is just the pressurization target object which can be hold | maintained with the hydraulic crimping tool 100. FIG. The above-described embodiments are merely representative, and various modifications can be made without departing from the scope of one embodiment. It goes without saying that the present invention can be embodied in various forms, and the scope of the present invention is indicated by the description of the scope of claims, and the equivalent meanings of the scope of claims, and all the scopes within the scope of the claims. Includes changes.

DESCRIPTION OF SYMBOLS 1 Aerial work vehicle 12 Booster 13 Booster cylinder 13a Booster chamber 15 Supply oil path 100 Hydraulic crimping tool
100a movable part

Claims (7)

A pressure increasing device for an aerial work vehicle that supplies hydraulic oil pressure increased by a pressure increasing cylinder to a hydraulic pressure bonding tool,
A supply oil passage connecting the pressure increasing chamber of the pressure increasing cylinder and the hydraulic pressure bonding tool;
An electromagnetic switching valve connected to the supply oil passage and switched between a state in which working oil is supplied to the supply oil passage and a state in which the working oil is not supplied;
A distance measuring means between a movable part of the hydraulic crimping tool and an object to be pressurized by the hydraulic crimping tool,
The electromagnetic switching valve is switched based on the detection value of the distance measuring means.
Booster for aerial work vehicles. After a predetermined time has elapsed since the distance measuring means has detected the reference value, the electromagnetic switching valve is switched to a state in which hydraulic oil is not supplied to the supply oil passage.
The pressure increasing device for an aerial work vehicle according to claim 1. When the speed of the movable part detected by the distance measuring means is equal to or lower than a predetermined speed, the electromagnetic switching valve is switched to a state where hydraulic oil is not supplied to the supply oil passage after a predetermined time has elapsed.
The pressure increasing device for an aerial work vehicle according to claim 1. The distance measuring means between the movable part and the pressurized object is a displacement sensor.
The pressure booster for an aerial work vehicle according to claim 2 or claim 3. The distance measuring means between the movable part and the pressurized object is a stroke sensor of the movable part,
The pressure booster for an aerial work vehicle according to claim 2 or claim 3. The distance measuring means between the movable part and the pressurized object is a stroke sensor of the movable part,
When holding one pressurization object with the hydraulic crimping tool, the detection value of the stroke sensor of the movable part is stored,
When holding another pressurization object or the same pressurization object of the same size as the one pressurization object,
Based on the detection value of the stroke sensor of the movable part when holding the one pressurized object,
The electromagnetic switching valve is switched to a state where hydraulic oil is not supplied to the supply oil passage;
The pressure increasing device for an aerial work vehicle according to claim 1. The electromagnetic switching valve is a proportional control valve;
When the distance measuring means detects a reference value,
The proportional control valve is controlled to decelerate and stop the movable part;
The pressure increasing device for an aerial work vehicle according to any one of claims 1 to 6.

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