JP5275083B2 - Construction machinery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To safely move a cab by a cab movement device with a body side gate and a cab side gate surely closed. <P>SOLUTION: Operation of the cab movement device 18 is allowed by a cab movement control circuit when it is detected that the movable gate 23C on the body side gate 23 is in the closed position by a body side gate detection switch 25 and it is detected that the movable gate 27C on the cab side gate 27 is in the closed position by a cab side gate detection switch 29. Operation of the cab movement device 18 can be forbidden when at least one of the movable gate 23C of the body side gate 23 and the movable gate 27C of the cab side gate 27 is opened, and erroneous movement of the cab 21 by an operator can be prevented when a worker other than the operator moves between a body side step 19 and a cab side step 22. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a construction machine such as a hydraulic excavator or a hydraulic crane, and more particularly to a construction machine for working at a high place in which a turning body is provided on an upper end side of a post extending upward and downward.

  Generally, a construction machine such as a hydraulic excavator or a hydraulic crane is provided on a lower traveling body capable of self-propelling, an upper revolving body that is turnably mounted on the lower traveling body, and a front side of the upper revolving body. It is roughly constituted by a working device.

  Further, for example, a hydraulic excavator for working at a high place, which is suitably used for landing materials loaded in the cargo space of a transport ship in a port or the like, has a cylindrical post extending upward and downward on a lower traveling body. It is provided and an upper revolving unit is pivotably attached to the upper end side of the post.

  In this case, the upper swing body has a main body portion on which an engine for driving the hydraulic pump is mounted, and a proximal end side is connected to the main body portion and a distal end side is a free end that moves relative to the main body portion. A cab moving device that is operated by pressure oil, a cab that is attached to the front end side of the cab moving device and on which an operator gets in, a main body side step that is provided on the main body and forms a scaffold when the operator gets on and off the cab, and a cab And a cab side step that is provided on the distal end side of the moving device and forms a scaffold when the operator gets on and off the cab.

  Then, when the goods loaded in the cargo hold of the transport ship are landed, the cab moving device moves the cab forward from the main body so that the operator in the cab can visually observe the interior of the cargo hold from above. The goods loaded in the hold can be smoothly landed using a work device (see Patent Document 1).

Japanese Patent Laid-Open No. 2004-2002

  By the way, the hydraulic excavator for working at a high place according to the prior art is configured such that the cab on which the operator gets is moved forward and backward between a position adjacent to the main body and a position spaced forward from the main body. ing.

  For this reason, the main body side step is usually provided with a main body side gate that is opened and closed between the door opening position and the door closing position when the operator moves to the cab side step. There is provided a cab side gate that is opened and closed between the door opening position and the door closing position when moving to the main body side step.

  Therefore, when an operator or the like moves between the main body side step and the cab side step, first, the main body side gate and the cab side gate are moved with the cab moving device moved to a position adjacent to the main body portion. By opening the door, an operator or the like can move from the main body side step to the cab side step, for example, and can get into the cab from the cab side step.

  In this case, the main body side gate and the cab side gate are usually provided with manual locks such as latches, and the main body side gate and the cab side gate are normally configured to hold the closed position by locking the manual lock. It has become.

  However, the manual lock provided on the main body side gate and the cab side gate is locked manually by an operator etc., so if you forget to lock this manual lock, make sure the main body side gate and cab side gate are securely locked. There is a problem that the cab is moved by the cab moving device even when the main body side gate and the cab side gate can be opened, because the cab moving device cannot be held in the closed position.

  The present invention has been made in view of the above-described problems of the prior art, and in a state where the main body side gate and the cab side gate are securely closed, the cab can be safely moved by the cab moving device. The purpose is to provide.

  In order to solve the above-described problems, the present invention comprises a post extending upward and downward, a revolving body provided on the upper end side of the post so as to be able to turn, and a working device provided on the revolving body. The swivel body has a main body portion on which an engine for driving a hydraulic pump is mounted, a proximal end side connected to the main body portion, and a distal end side which is a free end that moves with respect to the main body portion, by pressure oil from the hydraulic pump. An operating cab moving device, a cab attached to the front end side of the cab moving device, an operator getting on, a main body side step provided on the main body portion to form a scaffold when the operator gets on and off the cab, and the cab A cab-side step provided on the distal end side of the moving device to form a scaffold when an operator gets on and off the cab, and a cab-side step provided on the main body-side step. The main body side gate that is opened and closed between the open position and the closed position when moving, and the open position between the open position and the closed position when moving to the main body side step. Applies to construction machines with cab-side gates that are opened and closed.

The feature of the configuration adopted by the invention of claim 1 is that the main body side gate detecting means for detecting whether the main body side gate is on the open or closed side, and the cab side gate is on the open or closed side. The cab side gate detection means for detecting whether the main body side gate detection means and the cab side gate detection means detect that the main body side gate and the cab side gate are both in the closed position. A cab movement control means that allows operation of the cab movement device, and includes a main power switch for a circuit for supplying power to and stopping the main body side gate detection means, the cab side gate detection means, and the cab movement control means, The cab movement control means operates the engine and / or the cab movement device even when the circuit main power switch is in a state where power supply is stopped. In that it comprises emergency operating means capable.

  According to a second aspect of the present invention, there is provided distance detection means for detecting a distance between the main body side step and the cab side step, and the cab movement control means is provided with a cab side step by the distance detection means. In this case, an automatic lock device is provided that locks the main body side gate and the cab side gate at the closed position when it is detected that the distance is greater than a predetermined distance.

According to the first aspect of the present invention, the cab movement control means allows the cab movement device to operate when both the main body side gate and the cab side gate are in the closed position, so that the operator or the like can operate the main body side step and the cab side. When moving between the steps, at least one of the main body side gate and the cab side gate is opened, so that the cab movement device is kept in an inactive (stopped) state by the cab movement control means. Accordingly, for example, when an operator other than the operator is moving between the main body side step and the cab side step, the operator can be surely prevented from moving the cab relative to the main body portion by mistake. It is possible to increase the safety when moving between the main body side step and the cab side step.
In addition, for example, when working with the cab moved to a position away from the main body, even if power supply from the main power switch to the cab movement control means is stopped due to a failure of the cab movement control means, The engine and / or the cab moving device can be operated by the operating means. As a result, the cab moving device can move the cab to the main body side without using the failed cab movement control means, thereby preventing the operator from being left behind in the cab stopped at a position away from the main body. be able to.

  According to the invention of claim 2, the operator who gets into the cab operates the cab moving device to move the cab with respect to the main body, whereby the cab side step is predetermined with respect to the main body side step. When the distance is more than the distance, the main body side gate and the cab side gate can be locked at the closed position by the automatic locking device. As a result, when the cab side step is away from the main body side step, an operator other than the operator can be forced to move between the main body side step and the cab side step so that each gate is locked at the closed position. Can certainly be prohibited.

1 is a front view showing a hydraulic excavator for high-altitude work according to an embodiment of the present invention. It is a front view which shows the state which the cab of the hydraulic shovel moved forward. It is a perspective view which expands and shows a main body side step, a main body side gate, a cab side step, a cab side gate, and the like. It is a perspective view which shows the state which made the main body side gate and the cab side gate in FIG. 3 the door open position. FIG. 5 is a component arrangement diagram showing the arrangement of components such as gate detection switches, electromagnetic locks, and inter-step distance sensors in FIG. It is an electric circuit diagram which shows the cab movement control means by this Embodiment. It is a flowchart which shows operation | movement of the cab movement control means by this Embodiment.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a construction machine according to the present invention will be described in detail with reference to the accompanying drawings, taking a hydraulic excavator for working at high places as an example.

  In the figure, reference numeral 1 denotes a hydraulic excavator for working at a high place, and the hydraulic excavator 1 is roughly constituted by a lower traveling body 2, a post 7, an upper turning body 11, a working device 14 and the like which will be described later. And the hydraulic excavator 1 is used for the cargo handling operation | work which unloads the material loaded into the hold of a transport ship, for example in a harbor.

  Reference numeral 2 denotes a self-propelled crawler-type lower traveling body. The lower traveling body 2 includes a track frame 3, drive wheels 4 and idler wheels 5 provided on the left and right side frames 3A of the track frame 3. The crawler belt 6 is wound around the drive wheel 4 and the idle wheel 5. The lower traveling body 2 travels stably on an uneven work site by driving the crawler belt 6 around by the drive wheels 4.

  Reference numeral 7 denotes a post erected on a track frame 3 constituting the lower traveling body 2, and the post 7 is formed as a large-diameter cylindrical body and extends upward and downward from the track frame 3. An annular turning wheel 8 is attached to the upper end of the post 7, and an upper turning body 11 described later is supported on the upper end side of the post 7 through the turning wheel 8 so as to be turnable.

  Reference numeral 9 denotes an intermediate step provided in the upper and lower intermediate portions of the post 7. The intermediate step 9 is disposed below the upper swing body 11 described later, and performs an inspection operation or the like on the upper swing body 11. In addition, it forms a scaffold for this worker. The intermediate step 9 is provided with a lower staircase 10 extending obliquely rearward toward the crawler belt 6, and an operator can get on and off between the ground and the intermediate step 9 using the lower staircase 10. It can be configured.

  Reference numeral 11 denotes an upper swing body that is pivotably attached to the upper end side of the post 7 via a swivel wheel 8. The upper swing body 11 includes a main body portion 12, a cab moving device 18, a main body side step 19, and a cab 21 which will be described later. , Cab side step 22 and the like.

  A main body 12 constitutes a main body portion of the upper swing body 11, and the main body 12 has a swing frame 13 serving as a base attached on the swing wheel 8. A working device 14 is provided on the front side of the swivel frame 13 so as to be movable up and down, and a counterweight 15 is provided on the rear end side of the swivel frame 13 to balance the weight with the work device 14. . A building cover 16 is disposed on the front side of the counterweight 15, and an engine 17 that drives a hydraulic pump is accommodated in the building cover 16. Further, on the left side of the revolving frame 13, a main body side step 19 to be described later is provided extending in the front and rear directions.

  Reference numeral 18 denotes a cab moving device provided between the main body 12 and a cab 21 described later. The cab moving device 18 moves the cab 21 to a position adjacent to the main body 12 as shown in FIG. As shown, it is moved forward and backward from a position spaced forward from the main body 12.

  Here, the cab moving device 18 has a base end side link 18A composed of two parallel links whose base end side is pin-coupled to the revolving frame 13 of the main body 12, and relays to the front end side of each base end side link 18A. A distal end side link 18C composed of two parallel links that are pin-coupled via a bracket 18B, a cab support frame 18D that is pin-coupled to the distal end side of each distal end side link 18C that is a free end, and a revolving frame 13 It is roughly constituted by two link cylinders 18E and 18F each formed of a hydraulic cylinder provided between the base end side link 18A and between the relay bracket 18B and the front end side link 18C.

  Then, the cab moving device 18 expands and contracts the two link cylinders 18E and 18F with pressure oil from a hydraulic pump (not shown) driven by the engine 17, so that the cab support frame 18D is turned into the revolving frame 13. Move it forward and backward. Accordingly, a cab 21 described later disposed on the cab support frame 18D can be moved forward and backward with respect to the main body 12.

  Reference numeral 19 denotes a main body side step provided in the main body portion 12 of the upper swing body 11. The main body side step 19 is attached to, for example, the left side surface of the swing frame 13 constituting the main body portion 12 and extends in the front and rear directions. ing. The main body side step 19 performs an inspection work on an operator who gets into a cab 21 described later, an engine 17 housed in the building cover 16, a mounting device (not shown) such as a hydraulic pump and a heat exchange device. It forms a scaffold for the elderly.

  Here, as shown in FIGS. 3 to 5, the main body side step 19 includes a floor plate portion 19A formed using expanded metal or the like, and a bar-shaped hand provided surrounding the peripheral edge portion of the floor plate portion 19A. This is roughly constituted by the slide 19B. Further, an upper staircase 20 extending obliquely rearward toward the intermediate step 9 is provided below the front portion of the main body side step 19. It is the structure which can get on and off between 19. A main body side gate 23 to be described later is provided on the front upper side of the main body side step 19.

  Reference numeral 21 denotes a cab located on the front end side of the cab moving device 18 and arranged on the left side of the front portion of the swivel frame 13. The cab 21 defines an operator cab and is used by an operator who operates the excavator 1. . The cab 21 is mounted on the cab support frame 18D of the cab moving device 18, and is positioned by the cab moving device 18 at a position adjacent to the main body 12 as shown in FIG. 1 and the front of the main body 12 as shown in FIG. It is the structure which can move between the positions spaced apart.

  In the cab 21, a driver seat where an operator is seated, a travel lever / pedal for controlling the travel of the lower traveling body 2, a work lever (not shown) for operating the work device 14, an engine described later A start switch 45, a cab movement switch 47, and the like are arranged (see FIG. 5).

  Reference numeral 22 denotes a cab side step that is located on the left side of the cab 21 and is provided on the tip side of the cab moving device 18. The cab side step 22 is attached to, for example, a cab support frame 18D. The cab-side step 22 extends to the left side of the cab 21 and extends in the front and rear directions to form a scaffold for an operator who gets on and off the cab 21.

  Here, as shown in FIGS. 3 to 5, the cab-side step 22 includes a floor plate portion 22A formed using expanded metal or the like, and a rod-like hand provided surrounding the peripheral portion of the floor plate portion 22A. This is roughly constituted by the slide 22B. Further, a cab-side gate 27 described later is provided on the rear upper side of the cab-side step 22.

  Accordingly, an operator who operates the excavator 1 climbs from the ground to the crawler belt 6 of the lower traveling body 2, climbs to the intermediate step 9 using the lower step 10, and then uses the upper step 20 from the intermediate step 9. Go to step 19 on the main unit side. The operator moves from the main body side step 19 to the cab side step 22 and gets into the cab 21 from the cab side step 22.

  Next, the main body side gate provided on the front side of the main body side step 19 will be described.

  That is, 23 indicates a main body side gate, and the main body side gate 23 ensures safety when an operator or the like moves between the main body side step 19 and the cab side step 22. As shown in FIGS. 3 and 4, the main body side gate 23 is erected on the floor plate portion 19A as a fence body having substantially the same height as the handrail 19B of the main body side step 19, and left and right directions It extends to.

  Here, the main body side gate 23 is connected to the handrail 19B of the main body side step 19 and extends to the left and right fixed gates 23A and 23B and extends between the left and right fixed gates 23A and 23B. And a movable gate 23 </ b> C arranged at the center. The base end side of the movable gate 23C is rotatably attached to the right fixed gate 23B via the hinge mechanism 23D, and the movable gate 23C is shown in FIG. It is configured to open and close between the opening position.

  Further, a plate-like stopper 23E is provided on the distal end side (free end side) of the movable gate 23C, and when the movable gate 23C is set to the door closing position, the stopper 23E comes into contact with the left fixed gate 23A, thereby moving the movable gate 23C. Is configured to limit the rotation range. Further, a gas spring 23F is provided between the movable gate 23C and the handrail 19B of the main body side step 19, and the movable gate 23C is constantly biased toward the closing position by the gas spring 23F. Yes.

  Reference numeral 24 denotes a main body side manual lock mechanism provided between the left fixed gate 23A and the movable gate 23C. The main body side manual lock mechanism 24 is manually operated by an operator or the like to hold the movable gate 23C in the closed position (lock). ) Here, the main body side manual lock mechanism 24 is configured by a latch provided on the movable gate 23C, for example, and when the movable gate 23C is in the closed position, for example, an operator or the like is manually engaged with the left fixed gate 23A. The movable gate 23C is fixed at the closed position by locking together. Accordingly, unless the operator or the like unlocks the main body side manual lock mechanism 24, the movable gate 23C maintains the door closing position and prohibits the operator or the like from moving from the main body side step 19 to the cab side step 22. It has a configuration that can.

  Reference numeral 25 denotes a body-side gate detection switch as a body-side gate detection means provided on the left fixed gate 23A of the body-side gate 23. The body-side gate detection switch 25 is constituted by, for example, a limit switch. The body-side gate detection switch 25 is closed when the movable gate 23C of the body-side gate 23 is locked by the body-side manual lock mechanism 24 and holds the door closing position. It is configured to be opened when it is not locked by the manual lock mechanism 24, that is, when the movable gate 23C is opened.

  Therefore, when the main body side gate detection switch 25 is closed, it can be determined that the movable gate 23C of the main body side gate 23 holds the closed position, and the main body side gate detection switch 25 is open. In some cases, the movable gate 23C is not securely held at the door closing position, and it can be determined that there is a risk of inadvertent opening.

  Reference numeral 26 denotes a main body side electromagnetic lock as an automatic locking device provided on the left fixed gate 23A of the main body side gate 23. The main body side electromagnetic lock 26 is composed of, for example, an electromagnet or the like, It is arranged. The main body side electromagnetic lock 26 is detected when the distance between the cab side step 22 and the main body side step 19 is more than a predetermined distance detected by an inter-step distance sensor 32 described later. The movable gate 23C is automatically locked at the closed position by magnetically attracting the stopper 23E provided on the movable gate 23C.

  Therefore, when the cab side step 22 is greatly separated from the main body side step 19 by moving the cab 21 forward from the main body portion 12 by the cab moving device 18, the main body side electromagnetic lock 26 is connected to the main body side gate 23. By forcibly locking the movable gate 23C at the closed position, the operator or the like can be prevented from inadvertently moving from the main body side step 19 to the cab side step 22.

  Next, the cab side gate provided at the rear end portion of the cab side step 22 will be described.

  That is, 27 indicates a cab side gate, and the cab side gate 27 ensures safety when the operator or the like moves between the main body side step 19 and the cab side step 22. As shown in FIGS. 3 and 4, the cab-side gate 27 is erected on the floor plate portion 22 </ b> A as a fence body having a height dimension substantially equal to the handrail 22 </ b> B of the cab-side step 22, and is directed leftward and rightward. It extends to.

  Here, the cab-side gate 27 is connected to the handrail 22B of the cab-side step 22 and extends left and right to the left and right fixed gates 27A and 27B, and between the left and right fixed gates 27A and 27B. And a movable gate 27 </ b> C arranged at the center. And the base end side of the movable gate 27C is rotatably attached to the left fixed gate 27A via the hinge mechanism 27D, and the movable gate 27C is shown in FIG. It is configured to open and close between the opening position.

  Further, a plate-like stopper 27E is provided at the distal end side (free end side) of the movable gate 27C, and the stopper 27E comes into contact with the right fixed gate 27B when the movable gate 27C is set to the door closing position, whereby the movable gate 27C. Is configured to limit the rotation range. Further, a gas spring 27F is provided between the movable gate 27C and the handrail 22B of the cab side step 22, and the movable gate 27C is constantly urged toward the closed position by the gas spring 27F. Yes.

  Reference numeral 28 denotes a cab-side manual lock mechanism provided between the right fixed gate 27B and the movable gate 27C. The cab-side manual lock mechanism 28 is manually operated by an operator or the like to hold the movable gate 27C in the closed position (lock). ) Here, the cab-side manual lock mechanism 28 is configured by, for example, a latch provided on the movable gate 27C, and when the movable gate 27C is in the closed position, for example, an operator or the like is manually engaged with the right fixed gate 27B. The movable gate 27C is fixed at the closed position by locking together. As a result, unless the operator or the like unlocks the cab side manual lock mechanism 28, the movable gate 27C maintains the closed position and prohibits the operator or the like from moving from the cab side step 22 to the main body side step 19. It has a configuration that can.

  Reference numeral 29 denotes a cab-side gate detection switch as a cab-side gate detection means provided on the right fixed gate 27B of the cab-side gate 27. The cab-side gate detection switch 29 is constituted by, for example, a limit switch. The cab-side gate detection switch 29 is closed when the movable gate 27C of the cab-side gate 27 is locked by the cab-side manual lock mechanism 28 and holds the closed position, and the movable gate 27C is closed on the cab side. It is configured to be opened when it is not locked by the manual lock mechanism 28, that is, when the movable gate 27C is opened.

  Therefore, when the cab-side gate detection switch 29 is closed, it can be determined that the movable gate 27C of the cab-side gate 27 holds the closed position, and the cab-side gate detection switch 29 is opened. In some cases, the movable gate 27C is not reliably held at the door closing position, and it can be determined that there is a risk of inadvertent opening.

  Reference numeral 30 denotes a cab-side electromagnetic lock as an automatic locking device provided on the right fixed gate 27B of the cab-side gate 27. The cab-side electromagnetic lock 30 is composed of, for example, an electromagnet or the like and is located near the cab-side manual lock mechanism 28. It is arranged. When the cab-side electromagnetic lock 30 detects that the distance between the cab-side step 22 and the main body-side step 19 is more than a predetermined distance by an inter-step distance sensor 32 described later, the cab-side gate 27 The movable gate 27C is automatically locked at the closed position by magnetically attracting the stopper 27E provided on the movable gate 27C.

  Accordingly, when the cab side step 22 is greatly separated from the main body side step 19 by moving the cab 21 forward from the main body portion 12 by the cab moving device 18, the cab side electromagnetic lock 30 is connected to the cab side gate 27. By forcibly locking the movable gate 27C to the closed position, the operator or the like can be prevented from inadvertently moving from the main body side step 19 to the cab side step 22.

  Furthermore, each indicator lamp 31,33,36, the distance sensor 32 between steps, the cab movement control circuit 43, etc. are demonstrated.

  Reference numeral 31 denotes a yellow indicator lamp for manual lock notification attached to the handrail 22B of the cab side step 22. The indicator lamp 31 is composed of a yellow lamp and is disposed in the vicinity of the cab side gate 27. When the main body side gate detection switch 25 and the cab side gate detection switch 29 are both closed, that is, the movable gate 23C of the main body side gate 23 is moved to the closed position by the main body side manual lock mechanism 24. It is lit when the movable gate 27C of the cab side gate 27 is held (locked) in the closed position by the cab side manual lock mechanism 28.

  Reference numeral 32 denotes an inter-step distance sensor as a distance detecting means provided between the main body side step 19 and the cab side step 22, and the inter-step distance sensor 32 is provided between the front end of the main body side step 19 and the cab side step 22. The distance between the rear end portion is detected. Here, the inter-step distance sensor 32 is constituted by, for example, an ultrasonic sensor, an infrared sensor, or the like, and is disposed at the rear end portion of the cab side step 22.

  Then, by moving the cab 21 forward from the main body portion 12 by the cab moving device 18, the rear end portion of the cab side step 22 and the front end portion of the main body side step 19 are separated by a predetermined distance or more. When the inter-step distance sensor 32 detects this, the main body side electromagnetic lock 26 and the cab side electromagnetic lock 30 are operated by a cab movement control circuit 43 described later. Accordingly, the movable gate 23C of the main body side gate 23 can be forcibly locked at the closed position, and the movable gate 27C of the cab side gate 27 can be forcibly locked at the closed position.

  Reference numeral 33 denotes a red indicator lamp for notifying the distance between steps attached to the handrail 19 </ b> B of the main body side step 19. The indicator lamp 33 is constituted by a red lamp and is arranged in the vicinity of the main body side gate 23. The indicator lamp 33 is lit when the inter-step distance sensor 32 detects that the distance between the cab side step 22 and the main body side step 19 is more than a predetermined distance. This notifies (warns) that the cab side step 22 and the main body side step 19 are largely separated.

  Reference numeral 34 denotes a main body side electrical box provided in the vicinity of the main body side gate 23, and the main body side electrical box 34 is attached to a handrail 19 B of the main body side step 19. In the main body side electric box 34, electric parts related to the main body side gate detection switch 25, the main body side electromagnetic lock 26 and the like are stored.

  Reference numeral 35 denotes a cab-side electrical box provided near the cab-side gate 27, and the cab-side electrical box 35 is attached to the handrail 22 </ b> B of the cab-side step 22. In the cab-side electrical box 35, electrical components related to the cab-side gate detection switch 29, the cab-side electromagnetic lock 30, and the like are stored.

  Reference numeral 36 denotes a green indicator lamp provided in the cab-side electrical box 35. The indicator lamp 36 is constituted by a green lamp. The indicator lamp 36 is lit when power is supplied to a cab movement control circuit 43 described later.

  Here, the main body side gate detection switch 25, the main body side electromagnetic lock 26, the cab side gate detection switch 29, the cab side electromagnetic lock 30, the inter-step distance sensor 32, and the like are described later for controlling the operation of the cab moving device 18. The cab movement control circuit 43 is configured, and the circuit configuration of the cab movement control circuit 43 will be described below with reference to FIG.

  First, reference numerals 41A and 41B in FIG. 6 denote power terminals for various electrical components mounted on the hydraulic excavator 1, and the power terminals 41A and 41B are constituted by a battery, for example, the upper swing body 11 (main body portion 12). In the building cover 16).

  Reference numeral 42 denotes a circuit main power switch. The circuit main power switch 42 supplies power to a cab movement control circuit 43 described later from power supply terminals 41A and 41B and stops the power supply. The circuit main power switch 42 is disposed, for example, in a control box (not shown) provided in the main body 12 of the upper swing body 11 and is closed before the work of the excavator 1 is started. It will be established later.

  43 denotes a cab movement control circuit as a cab movement control means formed on the downstream side of the circuit main power switch 42. The cab movement control circuit 43 includes a main body side gate detection switch 25, a cab side gate detection switch 29, Main body side electromagnetic lock 26, cab side electromagnetic lock 30, step distance sensor 32, indicator lamps 31, 33, 36, relays R1, R2, R3, normally closed contact R1-1, normally closed contacts R2-1, R2- 2. Consists of normally open contacts R3-1 and R3-2.

  In this case, the main body side gate detection switch 25, the cab side gate detection switch 29, and the relay R1 are connected in series between the power supply terminals 41A and 41B, and the indicator lamp 31 and the relay R1 are connected in parallel. The normally closed contact R1-1 of the relay R1 and the relay R2 are connected in series between the power supply terminals 41A and 41B. The inter-step distance sensor 32 and the relay R3 are connected in series between the power supply terminals 41A and 41B, and the indicator lamp 33 and the relay R3 are connected in parallel. Furthermore, the main body side electromagnetic lock 26 and the normally open contact R3-1 of the relay R3 are connected in series between the power supply terminals 41A and 41B, and the cab side electromagnetic lock 30 and the normally open contact R3-2 of the relay R3 are: The power supply terminals 41A and 41B are connected in series.

  An engine start motor 44 starts the engine 17, and the engine start motor 44 is disposed in the building cover 16 of the upper swing body 11. The engine start motor 44, the engine start switch 45, and the normally closed contact R2-1 of the relay R2 are connected in series between the power supply terminals 41A and 41B. Here, the engine start switch 45 is disposed in the cab 21 and is configured to be opened and closed by an operator.

  46 is a cylinder solenoid valve that controls supply and discharge of pressure oil to and from the link cylinders 18E and 18F of the cab moving device 18, and the cylinder solenoid valve 46 is disposed in the building cover 16 of the upper swing body 11, for example. . The cylinder solenoid valve 46, the cab movement switch 47, and the normally closed contact R2-2 of the relay R2 are connected in series between the power supply terminals 41A and 41B. The cab movement switch 47 is arranged in the cab 21 and is configured to be opened and closed by an operator.

  Here, the engine starting motor 44 and the cylinder solenoid valve 46 are directly connected to the power terminals 41A and 41B without the circuit main power switch 42 interposed therebetween. Accordingly, even when the circuit main power switch 42 is opened, the engine start switch 45 is closed to start the engine 17 by the engine start motor 44 and drive the hydraulic pump (not shown) by the engine 17. can do. Further, by closing the cab movement switch 47, the pressure oil can be supplied to and discharged from the link cylinders 18E and 18F of the cab movement device 18 through the cylinder electromagnetic valve 46.

  That is, in the present embodiment, the engine start motor 44, the engine start switch 45, the normally closed contact R2-1, the cylinder solenoid valve 46, the cab movement switch 47, and the normally closed contact R2-2 in FIG. Constitutes emergency operating means.

  The excavator 1 for working at a high place according to the present embodiment has the above-described configuration, and the operator goes from the ground to the intermediate step 9 by using the lower staircase 10 and from the intermediate step 9 to the upper staircase 20. Use it to go to the main unit side step 19. Then, the operator opens a control box (not shown) provided in the main body 12 of the upper swing body 11 and closes the circuit main power switch 42 arranged in the control box.

  Next, the operator unlocks the main body side manual lock mechanism 24 provided on the main body side gate 23, opens the movable gate 23 </ b> C, passes through the main body side gate 23, and then again releases the main body side manual lock mechanism 24. By locking, the movable gate 23C is held at the closed position. Then, the operator unlocks the cab-side manual lock mechanism 28 provided on the cab-side gate 27, opens the movable gate 27C, passes through the cab-side gate 27, and then locks the cab-side manual lock mechanism 28 again. By doing so, the movable gate 27C is held in the closed position.

  In this way, the operator gets into the cab 21 from the cab side step 22 with the main body side gate 23 and the cab side gate 27 held in the closed position shown in FIG. Then, the operator getting into the cab 21 closes the engine start switch 45 and closes the cab movement switch 47. As a result, the engine 17 is started by the engine starting motor 44 and the hydraulic pump is driven, and the pressure oil from the hydraulic pump is supplied to and discharged from the link cylinders 18E and 18F of the cab moving device 18 through the cylinder electromagnetic valve 46. The cab 21 is moved forward from the main body 12 by the cab moving device 18 (see FIG. 2).

  Thereby, for example, when carrying out the landing work of the goods loaded in the cargo hold of the transport ship at a port or the like, the operator in the cab 21 can visually observe the cargo ship's hold from a high position over a wide range. it can. Then, the operator can perform a material landing work using the work device 14 by operating a work lever (not shown) arranged in the cab 21.

  Here, in the excavator 1 for working at a high place according to the present embodiment, the movable gate 23C of the main body side gate 23 and the movable gate 27C of the cab side gate 27 both hold the closed position (position of FIG. 3). In this state, a cab movement control circuit 43 that allows the cab movement device 18 to operate is provided. Hereinafter, the operation of the cab movement control circuit 43 will be described with reference to FIG.

  First, in step 1 in FIG. 7, it is determined whether or not the main power switch 42 is closed. If it is closed, the indicator light 36 is turned on in step 2 and the process proceeds to step 3. If the power switch 42 is open, the process proceeds to step 23 described later.

  Here, in step 3, whether the main body side gate detection switch 25 and the cab side gate detection switch 29 are closed, that is, the main body side manual lock mechanism 24 and the cab side manual lock mechanism 28 are locked. If at least one of the gate detection switches 25 and 29 is open, that is, if at least one of the manual lock mechanisms 24 and 28 is not locked, go to Step 4. move on. In step 4, the manual lock notification indicator lamp 31 is turned off and the relay R1 is demagnetized.

  As a result, the normally closed contact R1-1 is closed and the relay R2 is excited in step 5, so that in the subsequent step 6, the normally closed contacts R2-1 and R2-2 are opened, and then the process returns to step 1. . As described above, when the normally closed contacts R2-1 and R2-2 are opened in step 6, even if the operator closes the engine start switch 45, the engine start motor 44 does not operate and the engine 17 is stopped. Even if the operator closes the cab movement switch 47, the cylinder solenoid valve 46 remains stopped.

  Thus, when it is detected by the main body side gate detection switch 25 and the cab side gate detection switch 29 that at least one of the main body side manual lock mechanism 24 and the cab side manual lock mechanism 28 is not locked, the cab 21 Even if the inside operator closes the engine start switch 45 and the cab movement switch 47, the cab movement device 18 does not operate. Therefore, for example, when an operator other than the operator is moving between the main body side step 19 and the cab side step 22, the operator in the cab 21 erroneously operates the cab moving device 18 to move the cab 21. It is possible to reliably prevent a situation where the main body 12 is moved.

  On the other hand, in step 3, when both the main body side gate detection switch 25 and the cab side gate detection switch 29 are closed, that is, both the main body side manual lock mechanism 24 and the cab side manual lock mechanism 28 are locked. If yes, in step 7, the manual lock notification indicator lamp 31 is turned on and the relay R1 is excited.

  As a result, the normally closed contact R1-1 is opened in step 8 and the relay R2 is demagnetized. Therefore, in the subsequent step 9, the normally closed contacts R2-1 and R2-2 are closed, and then in step 10, the operator Determines whether the engine start switch 45 is closed. If the engine start switch 45 is not closed, the engine start motor 44 remains stopped in step 11, and the process returns to step 1. On the other hand, when the engine start switch 45 is closed, after the engine start motor 44 is operated in step 12, the process proceeds to step 13.

  Next, in step 13, it is determined whether or not the operator has closed the cab movement switch 47. If the cab movement switch 47 is not closed, the cylinder solenoid valve 46 remains stopped in step 14. So return to step 1. On the other hand, when the cab movement switch 47 is closed, the cylinder solenoid valve 46 is actuated in step 15, and then the process proceeds to step 16.

  As described above, when the engine start switch 45 is closed in Step 10, the engine 17 is started by the engine start motor 44, and a hydraulic pump (not shown) can be driven by the engine 17. Further, by closing the cab movement switch 47, the pressure oil from the hydraulic pump is supplied to and discharged from the link cylinders 18E and 18F of the cab movement device 18 through the cylinder electromagnetic valve 46. Thereby, the cab moving device 18 extends as shown in FIG. 2, and the cab 21 can be moved forward from the main body 12.

  Here, as the cab 21 moves forward, the distance between the rear end portion of the cab side step 22 and the front end portion of the main body side step 19 gradually increases. Therefore, in step 16, it is determined whether or not the inter-step distance sensor 32 is closed, that is, whether or not the distance between the cab side step 22 and the main body side step 19 is more than a predetermined distance.

  If the inter-step distance sensor 32 is not closed, that is, if the distance between the cab side step 22 and the main body side step 19 is less than a predetermined distance, the process proceeds to step 17, The red indicator lamp 33 for notifying the distance is turned off and the relay R3 is demagnetized. As a result, the normally open contacts R3-1 and R3-2 are opened in step 18, so in the subsequent step 19, after the main body side electromagnetic lock 26 and the cab side electromagnetic lock 30 are deactivated (unlocked), Return to step 1.

  On the other hand, if the inter-step distance sensor 32 is closed in step 16, that is, if the distance between the cab side step 22 and the main body side step 19 is more than a predetermined distance, the process proceeds to step 20. The red indicator lamp 33 for notifying the distance is turned on and the relay R3 is excited. As a result, the normally open contacts R3-1 and R3-2 are closed in step 21, so that in the following step 22, the main body side electromagnetic lock 26 and the cab side electromagnetic lock 30 are actuated (locked), and then the step Return to 1.

  In this way, when the cab 21 is moved forward by the cab moving device 18 and the cab side step 22 and the main body side step 19 are separated by a predetermined distance or more, the main body side electromagnetic lock 26 is provided. Is activated to forcibly lock the movable gate 23C of the main body side gate 23 to the closed position, and the cab side electromagnetic lock 30 is activated to forcibly lock the movable gate 27C of the cab side gate 27 to the closed position. Thereby, when the cab 21 is moved by the cab moving device 18, it is possible to reliably prevent, for example, an operator other than the operator from forcibly moving between the main body side step 19 and the cab side step 22. .

  Next, in the present embodiment, the engine starting motor 44, the engine starting switch 45, the normally closed contact R2-1, the cylinder solenoid valve 46, the cab moving switch 47, and the normally closed contact R2-2 shown in FIG. By providing the emergency operation means, the cab moving device 18 is operated even when the circuit main power switch 42 stops supplying power to the cab moving control circuit 43 due to a failure of the cab moving control circuit 43, for example. The emergency operation means will be described below.

  In this case, since the circuit main power switch 42 is opened in step 1, the process proceeds to step 23, where the indicator lamps 31, 33, 36 are turned off and the relays R1, R2, R3 are demagnetized. , Go to Step 9. As a result, the normally closed contacts R2-1 and R2-2 are closed in step 9, so that the engine start switch 45 is closed in step 10 and the cab movement switch 47 is closed in step 13, thereby moving the cab. The device 18 can be activated.

  Thus, for example, even when the circuit main power switch 42 stops power supply due to a failure of the cab movement control circuit 43 or the like in a state where the cab 21 is moved forward of the main body 12 (state shown in FIG. 2), The cab moving device 18 is actuated by the actuating means, and the cab 21 can be moved to a position adjacent to the main body portion 12 (position in FIG. 1). Therefore, the operator can safely move from the cab 21 to the cab side step 22 and the main body side step 19 without being left in the cab 21.

  Thus, the excavator 1 for working at a high place according to the present embodiment includes a main body side gate detection switch 25 that detects whether the movable gate 23C of the main body side gate 23 is in the open position or the closed position, and the cab side. The cab-side gate detection switch 29 that detects whether the movable gate 27C of the gate 27 is in the open position or the closed position, and the movable gate 23C and the movable gate 27C are both closed by the gate detection switches 25 and 29. A cab movement control circuit 43 that allows the cab movement device 18 to operate when it is detected that the position is in the position is provided.

  Thus, when an operator or the like moves between the main body side step 19 and the cab side step 22, at least one of the movable gate 23C of the main body side gate 23 and the movable gate 27C of the cab side gate 27 opens. The cab movement control circuit 43 can inhibit the operation of the cab movement device 18. As a result, for example, when an operator other than the operator moves between the main body side step 19 and the cab side step 22, the operator can be prevented from moving the cab 21 relative to the main body portion 12 by mistake. The safety when moving between the main body side step 19 and the cab side step 22 can be improved.

  Further, an inter-step distance sensor 32 for detecting a distance between the main body side step 19 and the cab side step 22 is provided, and the cab side step 22 is predetermined with respect to the main body side step 19 by the inter-step distance sensor 32. When it is detected that the distance is greater than the distance, the movable gate 23C of the main body side gate 23 is forcibly locked to the closed position by the main body side electromagnetic lock 26, and the movable gate of the cab side gate 27 is locked by the cab side electromagnetic lock 30. 27C is forcibly locked in the closed position.

  As a result, when the cab side step 22 is away from the main body side step 19, an operator other than the operator forcibly moves between the main body side step 19 and the cab side step 22. , 27C can be reliably prohibited by locking in the closed position.

  Further, by providing emergency operation means comprising an engine start motor 44, an engine start switch 45, a normally closed contact R2-1, a cylinder electromagnetic valve 46, a cab movement switch 47, and a normally closed contact R2-2, the circuit Even when the main power switch 42 stops power supply to the cab movement control circuit 43, the cab movement device 18 can be operated.

  Thus, for example, even when the circuit main power switch 42 stops power supply due to a failure of the cab movement control circuit 43 or the like in a state where the cab 21 is moved forward of the main body 12 (state shown in FIG. 2), The operator can operate the cab moving device 18 to move the cab 21 to a position adjacent to the main body 12 (the position shown in FIG. 1), so that the operator can move from the cab 21 to the cab side step 22 and the main body side step 19. And can safely escape from the cab 21.

  In the above-described embodiment, the cab movement control circuit 43 is used as the cab movement control unit. However, the present invention is not limited to this, and the cab movement control means may be configured by a controller using, for example, a microcomputer.

  Moreover, in embodiment mentioned above, the excavator 1 for the high place work which attached the upper revolving body 11 to the post 7 standingly arranged on the lower traveling body 2 which can be self-propelled as a construction machine is illustrated. However, the present invention is not limited to this. For example, the excavator for dredging work in which the swivel body is attached to the post erected on the deck of the carriage, or the revolving body is attached to the post erected on the ground. It can be widely applied to stationary hydraulic excavators and the like.

1 Excavator (construction machine)
7 Post 11 Upper swing body (swivel body)
DESCRIPTION OF SYMBOLS 12 Main-body part 14 Working apparatus 17 Engine 18 Cab moving apparatus 19 Main body side step 21 Cab 22 Cab side step 23 Main body side gate 25 Main body side gate detection switch (main body side gate detection means)
26 Body side electromagnetic lock (automatic locking device)
27 Cab side gate 29 Cab side gate detection switch (cab side gate detection means)
30 Cab side electromagnetic lock (automatic locking device)
32 Inter-step distance sensor (distance detection means)
41A, 41B Power supply terminal 42 Main power switch for circuit 43 Cab movement control circuit (cab movement control means)

Claims (2)

A post extending upwardly and downwardly, a revolving body provided on the upper end side of the post so as to be able to turn, and a working device provided on the revolving body,
The swivel body includes a main body portion on which an engine for driving a hydraulic pump is mounted, a base end side connected to the main body portion, and a distal end side serving as a free end that moves with respect to the main body portion. A cab moving device that is operated by the cab, a cab that is attached to the front end side of the cab moving device and that an operator gets on, a main body side step that is provided on the main body portion and forms a scaffold when the operator gets on and off the cab, and A cab side step that is provided at the front end side of the cab moving device and forms a scaffold when an operator gets on and off the cab; and a door opening position and a door closing position that are provided at the main body side step and move to the cab side step. A main body side gate that is opened and closed between, a door opening position and a door closing position that are provided in the cab side step and move to the main body side step. Open between, a construction machine comprising a cab side gates closed,
A main body side gate detecting means for detecting whether the main body side gate is open or closed; a cab side gate detecting means for detecting whether the cab side gate is open or closed; and the main body A cab movement control means for allowing the cab moving device to operate when it is detected by the side gate detection means and the cab side gate detection means that both the main body side gate and the cab side gate are in the closed position ;
A main power switch for a circuit for supplying power to and stopping the main body side gate detection means, the cab side gate detection means and the cab movement control means;
Said cab movement control means, the main power switch for the circuit even in a state that stops supplying power, where the structure Ru equipped with emergency actuation means capable of actuating said engine and / or the cab moving device A featured construction machine. A distance detecting means for detecting a distance between the main body side step and the cab side step;
When the cab movement control means detects that the cab side step is more than a predetermined distance from the main body step by the distance detection means, the main body side gate and the cab side gate are connected to each other. The construction machine according to claim 1, wherein an automatic lock device that locks the door at a closed position is provided.

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