JP2007285014A - Working machine having liftable operator cab - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a working machine having a liftable operator cab superior in operability capable of easily preventing vibration of an operator cab caused by travel in the optional operator cab height. <P>SOLUTION: This working machine travels with the operation cab 3 as a lifting position, by liftably installing the operation cab 3 on a car body 2. A vibration preventive column 34 is arranged on the car body 2. The operation cab 3 is provided with a disc brake 35 for preventing the vibration of the operation cab, by bringing a brake disc into pressure contact with the column 34. Braking by the disc brake 35 is automatically released when lifting the operation cab. A brake release of the disc brake 35 is performed prior to starting of a lifting driving device, and stopping of the driving device is performed prior to brake input. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a working machine having a lift-type cab in which the cab is raised to widen the field of view during traveling, and more particularly to prevention of vibration of the cab when traveling with the cab raised.

  In some conventional work machines, the operator's cab is raised during work in order to expand the field of view of the operator during work (see, for example, Patent Document 1). In the working machine described in Patent Document 1 that operates in such a state that the cab is raised, the cab is attached to the rear column so that the cab can be moved up and down by a hydraulic cylinder, and the cab is pinned to the front column and fixed. It is a structure to do.

Japanese Patent Laid-Open No. 3-72122

  In a working machine having such a lift-type cab, particularly in a case where the cab is supported in a cantilever manner by the rear column, when it is necessary to work while traveling with the cab raised, There is a problem in that the driver's cab vibrates due to the unevenness, and the ride comfort becomes worse.

  In order to prevent vibration when traveling with the cab of the working machine having such a lift cab raised, the cab is pinned and fixed to the front strut as described in the publication. Thus, vibration can be prevented to some extent. However, if the cab is fixed to the column with this pin to prevent the cab from vibrating, vibration due to the presence of rattling in the fixed part due to the pin is inevitable, and the cab load acts on the pin. Therefore, it is difficult to insert and remove the pins, and there is a problem that the cab cannot be braked at an arbitrary height.

  In view of the above problems, an object of the present invention is to provide a work machine having a liftable cab with good operability that can easily prevent vibration of a cab accompanying traveling at an arbitrary cab height. And

The work machine having the lifting / lowering cab according to claim 1, wherein the working machine has a lifting / lowering cab attached to the vehicle body so that the cab can be moved up and down, and travels with the cab in the raised position.
A support for vibration prevention is provided on the vehicle body,
A disc brake is provided on the driver's cab side to prevent vibration of the driver's cab by pressing a brake plate against the support.

The working machine having the lifting / lowering cab according to claim 2, wherein the working machine having the lifting / lowering cab according to claim 1,
An interlocking device for releasing the brake of the disc brake in conjunction with an operation of a driving device for raising and lowering the cab is provided.

The working machine having the lifting / lowering cab according to claim 3, wherein the working machine having the lifting / lowering cab according to claim 2,
An operation control device is provided, wherein the brake release of the disc brake is preceded by the start of the drive device, and the drive device is stopped before the brake is applied.

  According to the first aspect of the present invention, since the brake plate can be pressed against the support column and braked while the cab is running high, the vibration of the cab can be prevented at an arbitrary height. This improves the ride comfort and improves workability when working while traveling. In addition, since the disc brake is used, the brake device can be easily turned on and off.

  According to the invention of claim 2, since the automatic brake releasing device for releasing the braking by the disc brake when the driving device for raising and lowering the cab is operated is provided, there is no need to perform the operation of releasing the brake, and the cab The operation when moving up and down is simplified.

  According to a third aspect of the present invention, since the brake control of the disk brake is released prior to the start of the drive device and the operation control device is provided to stop the drive device prior to the brake application, the cab is moved up and down. There is no possibility of occurrence of a situation where the brake is applied when the brake is applied, and there is no possibility that an excessive force acts on the lifting device in the cab.

  FIGS. 1 and 2 are a side view and a plan view, respectively, showing an embodiment of a working machine having a lift-type cab according to the present invention. In this embodiment, the working machine is a working machine for landmine disposal. Here is a case. In these drawings, 1 is a crawler type traveling body, 2 is a vehicle body mounted on the traveling body 1, 3 and 4 are cabs and power units mounted on the vehicle body 2, and 5 is a landmine attached to the front of the vehicle body 2. A blasting device 6 is a collecting device for facilitating the reuse of the ground, etc., from which mine has been collected and landmines have been collected. The power unit 4 includes an engine, a hydraulic pressure source of a hydraulic actuator such as a hydraulic cylinder and a hydraulic motor described later, and a generator.

  The mine blasting device 5 is attached to the front portion of the vehicle body 2 so as to be swingable up and down by a vertically moving cylinder 9 which is a hydraulic cylinder with a pin 7 as a center. Reference numeral 10 denotes a frame of the mine blasting device 5, and this frame 10 is composed of left and right frames 10a and a rear frame 10b connecting the frames 10a. A drive motor 11 composed of a hydraulic motor is attached to each of the left and right frames 10a, and a shaft 12 driven by these drive motors 11 is installed between the left and right frames 10a. A chain 13 for hitting a land mine as the shaft 12 rotates at high speed is attached to the shaft 12 with one end coupled to the shaft 12.

  The left and right frames 10a are attached with sleds 14 projecting downward from the lower surface of the frame 10b. This sled 14 is for moving the mine blasting device 5 along the ground. Reference numerals 15 and 16 denote a lower guard frame and an upper guard frame attached to the rear frame 10b, respectively, and shells and the like generated by the mine explosion scatter to the vehicle body 2, the cab 3 mounted on the vehicle body, the power unit 4 side, and the like. It is to prevent that.

  The recovery device 6 is installed between the left and right frames 22 attached to the rear portion of the vehicle body 2 by a vertical movement cylinder 21 including a hydraulic cylinder around a pin 20 and the distal ends of the left and right frames 22. It consists of a horizontal frame 23 and a plurality of recovery claws 24 attached to the horizontal frame 23.

  3, 4, and 5 are a side view, a plan view, and a rear view, respectively, showing the mounting structure of the cab 3 of the present embodiment. Reference numeral 25 denotes an elevating guide column vertically provided on the rear side of the cab 3 in the vehicle body 2, and 26 is an elevating frame mounted on the left and right guide columns 25 so as to be movable up and down. The cab 3 is attached to the cab mounting surface 26a of the elevating frame 26 via cushion rubber or the like. Above and below the elevating frame 26, a sliding device 28 including a slide plate (not shown) for smoothly sliding the elevating frame 26 on the side surface and the back surface of the guide column 25 is provided.

  Reference numeral 29 denotes an elevating cylinder which is a hydraulic cylinder for elevating the cab 3. The elevating cylinder 29 is connected to a bracket 31 provided on the elevating frame 26 by a pin 30 and a piston rod is provided to the vehicle body 2. The bracket 32 is coupled by a pin 33.

  FIG. 6 shows a state in which the lift cylinder 29 is extended to set the cab 3 to a high position.

  Reference numeral 34 denotes a vibration-preventing support column erected at a position corresponding to the center of the front portion of the cab 3 in the vehicle body 2 and has a T-shaped cross section. The vibration prevention column 34 is set to be approximately half the height of the cab 3 so as not to obstruct the field of view of the operator in the cab 3.

  Reference numeral 35 denotes a disc brake. The disc brake 35 is attached to a bracket 38 provided on the front surface of the elevating frame 26 and is mounted so as to sandwich the left and right side surfaces of the column 34. 7 and 8 are a side view and a partially sectional plan view of the disc brake 35, respectively. The disc brake 35 includes brake cylinders 35a and 35b, which are hydraulic cylinders of the same type on the left and right sides. The bracket 38 is sandwiched between the brakes 35a and 35b. The disc brake 35 is coupled by bolts 36 and nuts 37.

  Reference numeral 40 denotes a piston built in the brake cylinder 35 a, and 41 denotes a piston rod fixed to the piston 40. A brake plate 42 is attached to the tip of the piston rod 41. A spring 43 presses the brake plate 42 against the side surface of the column 34. The brake cylinder 35b is configured similarly.

  These brake cylinders 35a and 35b are supplied with pressure fluid, so that the piston 40, the piston rod 41 and the brake plate 42 are immersed in the brake cylinders 35a and 35b. The brake plate 42 is pressed against both side surfaces of the column 34 by force to prevent vibration of the cab 3.

  FIG. 9 shows a hydraulic circuit for operating the brake cylinders 35a and 35b and the lift cylinder 29. 44 and 45 are auxiliary pumps and pilot pumps provided in the power unit 4, respectively. 46 is a control valve for the elevating cylinder 29, 47 is a pilot valve for the control valve 46, and 48 is an operation for operating the pilot valve 47 (control valve 46) and the control valve 61 for the brake cylinders 35a and 35B in conjunction with each other. This operation switch 48 is provided in the cab 3.

  The output lines 50 and 51 of the operation switch 48 are connected to solenoids 52 and 53 of the pilot valve 47, respectively. By switching the operation switch 48 from the neutral position to the left and right, the solenoid 52 or 53 is energized, and the upper or lower on the drawing. It is configured to switch to a position. The output lines 50 and 51 of the operation switch 48 are connected to the solenoid 61a of the control valve 61 of the brake cylinders 35a and 35b.

  55 and 56 are throttle valves with check valves 59 and 60 inserted into the secondary circuits 57 and 58 of the pilot valve 47, and are inserted into one secondary circuit 62 of the control valve 61 for the brake cylinders 35a and 35b. Along with the throttle valve 64 with the check valve 63, the brake is automatically released prior to the operation of the elevating cylinder 29 when the elevating cylinder 29 is operated, and is provided to apply the brake after the operation of the elevating cylinder 29 is completed. Therefore, these valves 55, 56, 59, 60, 63 and 64 constitute an operation control device. Since the output lines 50 and 51 of the operation switch 48 are connected to the solenoid 61a of the control valve 61, the control valve 61 is also switched when the pilot valve 47 is switched.

  65 is a throttle valve with a check valve 66 for preventing the driver's cab 3 from dropping suddenly due to its own weight when the driver's cab 3 is lowered, and 67 is a bottom chamber of the lift cylinder 29 due to its own weight. This is a pilot check valve that prevents liquid leakage through the control valve 46.

  Reference numeral 70 denotes a gate lock valve provided in the cab 3, and the primary circuit 71 of the valve 70 is connected to the other secondary circuit 72 of the control valve 61 of the brake cylinders 35 a and 35 b via a check valve 73. Is done. One secondary circuit 74 of the gate lock valve 70 is connected to a hydraulic motor other than the elevating cylinder 29 and the brake cylinders 35a and 35b and a pilot valve (not shown) for the hydraulic cylinder. The other secondary circuit 75 of the gate lock valve 70 is connected to the hydraulic pressure source port of the pilot valve 47 of the control valve 46 for the lift cylinder 29.

  Reference numeral 76 denotes a relief valve for setting the maximum hydraulic pressure of the secondary side circuits 74 and 75 of the gate lock valve 70. This relief pressure is set to 4 MPa, for example. Reference numeral 77 denotes a relief valve that sets the maximum hydraulic pressure supplied to the brake cylinders 35a and 35b. This relief pressure is set to 13.5 MPa, for example. Reference numeral 78 denotes a check valve that blocks inflow of pressurized fluid from the primary circuit 71 of the gate lock valve 70 to the brake cylinders 35a and 35b.

  In this embodiment, the landmine removal work is performed while operating the traveling body 1 and running the working machine. Prior to the work by traveling of the working machine, the elevating cylinder 29 is extended to raise the cab 3. When the cab 3 is raised, the gate lock valve 70 is set at the lower position in the drawing, and the secondary circuit 74 is operated as a tank pressure by operating hydraulic actuators other than the lifting cylinder 29 and the brake cylinders 35a and 35b. That is, the operation of the traveling body 1, the mine blasting device 5, the recovery device 6 and the like is prevented. This increases safety.

  Then, by operating the operation switch 48, the solenoid 53 of the pilot valve 47 is energized through the output line 51 to switch the pilot valve 47 to the lower position in the drawing. At this time, the solenoid 61a of the control valve 61 is also energized through the output line 51 and the control valve is switched to the left position, and the pressure fluid from the pilot pump 45 is supplied to the control valve 61, its secondary circuit 62, and the check valve 63. Is supplied to the brake cylinders 35a and 35b, and the pistons 40, piston rods 41 and brake plates 42 of the brake cylinders 35a and 35b move in the direction away from the column 34 against the force of the spring 43, and the brake is released. At this time, the hydraulic pressure acting on the brake cylinders 35a and 35b is a hydraulic pressure obtained by adding the relief pressures of the relief valves 76 and 77.

  In this way, the operation circuit of the brake cylinders 35a and 35b is changed to the circuit 62 different from the pilot circuit 72 of the other actuator, and the brake cylinder 35a, 35b can be operated at an optimal hydraulic pressure.

  On the other hand, when the pilot valve 47 is switched to the lower position, the pilot pressure fluid is supplied to the left operation chamber of the control valve 46 through the throttle valve 56. At this time, the pilot pressure fluid is supplied through the pilot valve 47 to the secondary circuit 62 of the control valve 61, the relief valve 77, the check valve 78, the primary circuit 71 of the gate lock valve 70, the gate lock valve 70, This is performed through the secondary circuit 75 and the pilot valve 47.

  By supplying the pilot pressure fluid to the operation chamber of the control valve 46, the control valve 46 is switched to the left position on the drawing. As a result, the pressure fluid of the auxiliary pump 44 is supplied to the bottom chamber of the lift cylinder 29 through the control valve 46, the pilot check valve 67, and the throttle valve 66, the lift cylinder 29 extends, and the operation chamber 3 rises.

  The switching of the control valve 46 to the left position (upward side) is performed later than the switching of the brake cylinder control valve 61 by the action of the throttle valve 56, and the extension operation of the elevating cylinder 29 is started after the brake is released. .

  When the operation of the operation switch 48 is stopped and the raising of the elevating cylinder 29 is stopped, the energization to the solenoid 61a of the control valve 61 is stopped. As a result, the return to the tank 80 is delayed, and the brake is released by the force of the spring 43 after the elevating cylinder 29 stops extending.

  In this way, when traveling with the cab 3 raised, the front portion of the cab 3 is in a state in which the brake plate 42 of the disc brake 35 is in pressure contact with the support column 34 by the force of the spring 43 to prevent vibration of the cab 3. Is done.

  The mine removal operation is performed by rotating the chain 13 together with the shaft 12 at high speed by operating the drive motor 11 while sliding the sled 14 on the ground with the bottom chamber and rod chamber of the vertical movement cylinder 9 short-circuited. The chain 13 is struck against the ground in a state where the chain 13 is stretched by centrifugal force, and the mine buried in the ground is impacted and blown up.

  Shells and debris generated by the mine explosion are prevented from being scattered to the rear vehicle body 2, the cab 3, etc. by the lower guard frame 15 and the upper guard frame 16 attached to the rear frame 10b.

  During the mine removal operation, the vertical movement cylinder 21 of the recovery device 6 is extended, and the lower ends of the plurality of recovery claws 24 are set to a position dug down from the ground. Let

  When the operation is stopped and the cab 3 is lowered, the operation switch 48 is operated in the opposite direction, the pilot valve 47 is switched to the upper position, the control valve 46 is switched to the right position, and the elevating cylinder 29 is contracted. At this time, by the action of the throttle valve 55 inserted in the pilot circuit 57 of the control valve 46, the control valve 61 is switched prior to the switching of the control valve 46, and the brake cylinders 35a and 35b are braked by the contraction of the lift cylinder 29. Release is performed in advance.

  According to the present embodiment, the vibration of the cab 3 can be prevented by the brake plate 42 being pressed against the support column 34 in the traveling state, and therefore the vibration of the cab 3 can be prevented at an arbitrary height. Thus, the ride comfort is improved and the workability when working while traveling is improved. In addition, since the disc brake 35 is used, it is easier to operate the device for braking as compared with the case where the pin is fixed to the column.

  Further, since the interlocking device for releasing the brake by the disc brake 35 when the driving device such as the lifting cylinder 29 for raising and lowering the cab 3 is operated, the brake is released in addition to the operation for extending and retracting the lifting cylinder 29. There is no need to perform an operation, and the operation when raising and lowering the cab is simplified.

  Further, throttle valves 55, 56 with check valves 59, 60, 63, which release the brake of the disc brake 35 prior to the start of the drive device such as the lift cylinder 29 and stop the drive device prior to the brake application, respectively. , 64 and the like, so that there is no possibility of occurrence of a brake being applied when the cab 3 is moved up and down, and an unreasonable force acts on the cab 3 and its lifting device. There is no fear.

  The present invention can be applied to other work machines in addition to the mine disposal work machine as long as it is a work machine that travels with the cab 3 raised. The present invention is also applicable to other working machines having, for example, a link type lifting device that vertically moves the cab 3 up and down. Further, as a driving device for raising and lowering the cab 3, a device having another structure such as a winch may be used instead of the hydraulic cylinder.

It is a side view which shows one Embodiment of the working machine by this invention. It is a top view of FIG. It is a side view of the cab of this Embodiment. FIG. 4 is an enlarged plan view of the cab of FIG. 3. FIG. 4 is an enlarged rear view of the cab of FIG. 3. It is a side view which shows the state which raised the cab of FIG. It is a side view of the brake disc of this Embodiment. FIG. 8 is a partial cross-sectional plan view of the brake disc of FIG. 7. It is a hydraulic-pressure circuit diagram of the raising / lowering device of the cab of this Embodiment.

Explanation of symbols

1: traveling body, 2: vehicle body, 3: cab, 4: power unit, 5: landmine blasting device, 6: recovery device, 9: vertical movement cylinder, 10: frame, 11: drive motor, 12: shaft, 13: Chain: 14: Sled, 15: Lower guard frame, 16: Upper guard frame, 21: Vertical motion cylinder, 22, 23: Frame, 24: Recovery claw, 25: Guide post, 26: Lifting frame, 28: Sliding device, 29: Lifting cylinder, 30: Pin, 31, 32: Bracket, 33: Pin, 34: Vibration prevention column, 35: Disc brake, 35a, 35b: Brake cylinder, 36: Bolt, 37: Nut, 38: Bracket, 39: Clearance, 40: Piston, 41: Piston rod, 42: Brake plate, 43: Spring, 44: Auxiliary pump, 45: Pilot pump, 46: Co Troll valve, 47: pilot valve, 48: operation switch, 50, 51 output line, 52, 53: solenoid, 55, 56: throttle valve, 59, 60: check valve, 61: control valve, 61a: solenoid, 63 : Check valve, 64: throttle valve, 65: throttle valve, 66: check valve, 67: pilot check valve, 70: gate lock valve, 73: check valve, 76, 77: relief, 78: check valve , 80: Tank

Claims (3)

In the working machine having a cab that can be moved up and down on the vehicle body, and has a lift cab that runs with the cab in the raised position,
A support for vibration prevention is provided on the vehicle body,
A work machine having a lift-type cab, wherein a disc brake is provided on the cab side so that a brake plate is pressed against the support to prevent vibration of the cab. In the working machine which has the raising / lowering type cab of Claim 1,
A work machine having a lift type cab characterized by comprising an interlock device that releases a brake of the disc brake in conjunction with an operation of a drive device that raises and lowers the cab. In the working machine which has the raising / lowering type cab of Claim 2,
A work machine having an elevating-type cab, wherein an operation control device is provided to release the brake of the disc brake before starting the drive device and to stop the drive device before applying the brake.

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