JP4231467B2 - Concrete pump truck boom actuator - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a boom operating device for a concrete pump vehicle in which a boom that is swung with a swivel frame by a swivel drive device in a concrete pump vehicle with a boom is raised and lowered.

  The boom-equipped concrete pump truck is widely used in concrete placement work or the like at a high place. As shown schematically in FIG. 4 as an example, a hopper 2 and a hopper 2 are disposed on a body 1 of the concrete pump truck. A concrete pump (not shown) that operates so as to suck and discharge the concrete inside is installed, and a swivel frame 3 is placed on the vehicle body 1 so as to be able to swivel horizontally. The lower end portion of the boom 5 is attached to be able to be raised and lowered via the support frame 4, the base end of the middle boom 6 is attached to the upper end portion (tip portion) of the lower boom 5, and the upper end portion (tip portion) of the middle boom 6 is attached. A multi-stage boom 8 is constructed by connecting the base ends of the upper boom 7 so that they can be raised and lowered. Further, two hoisting hydraulic cylinders 9 are interposed between the support frame 4 and the lower boom 5 on the revolving frame 3, and between the lower boom 5 and the middle boom 6, and between the middle boom. 6, hoisting hydraulic cylinders 10 and 11 are interposed between the upper boom 7 and the upper boom 7, respectively. By operating the hoisting hydraulic cylinders 9, 10, 11 to extend and contract, the lower boom 5 and the middle boom 6 are connected. The upper booms 7 can be raised and lowered and expanded and contracted.

  The concrete pipe 12 for transporting the concrete discharged from the concrete pump is connected to the discharge side of the concrete pump, and is placed along the vehicle body 1 before the center of the swivel frame 3 as shown in FIG. A hollow connecting shaft that is raised to the upper swing body A side through a pivot joint 14 for oil piping installed in the section and is further along the lower boom 5 and then connects the lower boom 5 and the middle boom 6. It passes along the middle boom 6 along the middle boom 6, and is supported along the upper boom 7 through a hollow connecting shaft that connects the middle boom 6 and the upper boom 7. It is supposed to be.

  The oil pipe swivel joint 14 is concentric so that a swivel cylinder 16 as a cylindrical body having a hole 17 for allowing the concrete pipe 12 to pass through the shaft center inside a fixed cylinder 15 as a cylindrical body can be swiveled. The fixed cylinder 15 is attached to and fixedly supported by a fixed member 19 via a flange portion 18 provided on the outer periphery, and the revolving cylinder 16 is a support member attached to the upper end. 20 is attached to and supported by the revolving frame 3 so that the revolving cylinder 16 can revolve together with the revolving frame 3. Further, as shown in FIG. 6, required systems (6 systems in the case of FIG. 6) in which the fixed cylinder 15 and the revolving cylinder 16 correspond to the number of the hydraulic cylinders 9, 10, 11 on the upper revolving body A side. The oil passage 21 is formed so that the piping on the lower fixed side B as the vehicle body side and the piping on the upper turning body A side can be communicated with each other via the oil passage 21.

  The hydraulic oil supply / discharge pipes 22a, 23a, 24a connected to the head side and the rod side of the hoisting hydraulic cylinders 9, 10, 11 for hoisting the booms 5, 6, 7 at the respective stages are swivel joints for oil pipes. 14 is connected to each pipe connection port 21a on the revolving cylinder 16 side, and is connected to the discharge side of the oil pump 25 mounted on the vehicle body 1 and the tank 26 via electromagnetic switching valves 27, 28, 29. The hydraulic oil supply / discharge pipes 22b, 23b, 24b to the undulation hydraulic cylinders 9, 10, 11 are connected to the pipe connection ports 21b on the fixed cylinder 15 side of the oil pipe swivel joint 14, respectively. It is. Thus, the electromagnetic switching valves 27, 28, 29 corresponding to the undulation hydraulic cylinders 9, 10, 11 are switched on the lower fixed side B, so that the undulation hydraulic cylinder 9, 10, 11 has the head side or rod side The pressure oil is supplied and discharged through the pipes 22b, 23b, 24b, the oil passage 21, and the pipes 22a, 23a, 24a.

  In the concrete pump truck configured as described above, since the concrete pipe 12 is provided at the turning center of the oil pipe turning joint 14, the turning frame 3 can be turned 360 degrees or more, so-called full turning is possible. However, in the case where full turning is possible, the electrical signal cannot be transmitted without passing the swivel joint 14 from the lower fixed side B to the upper swivel body A side. Therefore, in the case of a concrete pump vehicle in which the swivel frame 3 is capable of full swiveling, it has been considered that electrical wiring to the upper swivel body A is not possible.

  In recent years, the swing frame of a concrete pump car can be turned infinitely so that the boom on the swing frame can be turned in all directions, and an electric mechanism such as a limit switch is provided on the boom so that the vehicle body side cable and the boom side cable The thing which can connect is proposed. That is, as shown in FIG. 7, a swivel joint 30 for oil piping is installed at the center of the swivel frame 3 installed on the vehicle body 1. The swivel joint 30 for oil piping is attached to the vehicle body 1 and fixed cylinder 31 as a cylindrical body positioned on the swing axis 0, and attached to the swing frame 3 and positioned on the swing axis 0. The revolving cylinder 32 is a cylindrical body, and the revolving cylinder 32 is combined inside the fixed cylinder 31 so as to be able to revolve, so that the concrete pipe 12 can be inserted through the axial center portion of the revolving cylinder 32 with a margin. It is. The fixed cylinder 31 is connected to a pressure oil pipe 33b on the vehicle body 1 side, and the swivel cylinder 32 is connected to a undulation cylinder for each boom in each stage. A pipe 33 a is connected, and the vehicle body side pipe 33 b and the boom side pipe 33 a are communicated with each other through an oil passage 34 formed inside the swivel joint 30. Further, there is a fixed contact body 36 around which the vehicle body side cable 35 b is connected around the fixed cylinder 31 of the swing joint 30, while the boom side cable 35 a is connected around the swing cylinder 32. The movable contact body 37 is provided so that the vehicle body side cable 35b and the boom side cable 35a can be connected to each other. A device that can be wired has been proposed (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 2002-4582

  However, the swivel joint 14 for oil piping in the conventional concrete pump truck is configured such that the supply and discharge oil passages 21 corresponding to the boom hydraulic cylinders 9, 10, 11 are formed, There is a problem that many oil passages 21 must be formed. Further, the one described in Patent Document 1 is a swing circuit 3 that is fully swivel and enables electrical wiring above the swing frame 3. A hydraulic circuit for operating each hydraulic cylinder for raising and lowering is disclosed. 6 is similar to the configuration in which the electromagnetic switching valve as shown in FIG. 6 is installed on the vehicle body side, and the oil passage 34 formed in the oil piping slewing joint 30 corresponds to the number of hydraulic cylinders for raising and lowering the multistage boom. A large number of systems are required, and there is a problem similar to that described above.

  Therefore, the present invention is intended to make it possible to make the oil passage formed in the swivel joint for oil piping provided in the swivel frame of the conventional concrete pump car into two systems.

In order to solve the above-mentioned problems, the present invention supports a lowermost boom of a multistage boom on a turning frame on a vehicle body so that the boom can be raised and lowered so that each boom can be raised and lowered by a hydraulic cylinder for raising and lowering. In addition, the pressure oil supply / discharge pipe connected to each of the hydraulic cylinders for undulation and the pressure oil supply / discharge pipe on the vehicle body side are communicated with each other through an oil passage of a swivel joint for oil pipe installed in the swivel frame. in boom actuator concrete pump vehicle by stretching each hoisting hydraulic cylinders are so as to relief operation of the boom, supported establishing an oil piping pivot joint on the lower side of the slip ring device attached to the rotating frame by, an electromagnetic switching valve for switching the pressure oil supply and discharge to said respective hoist hydraulic cylinder, so as to install the upper position of the rotating frame, and said slip ring device The electrical wiring led onto the rotating frame through Luo the oil pipe for turning the joint, so as to be connected to the solenoid of each solenoid selector valve, further, the oil passage of the swivel fitting for the oil pipe, a pressurized oil supply The system is configured to have two systems for discharging pressure oil.

Also, in the above configuration, the electrical wiring from the slip ring device installed on the lower side of the swivel joint for oil piping is swung through the wiring through hole provided in the axial direction at the required location of the swivel cylinder of the swivel joint for oil piping. It is assumed that a configuration for guiding the frame is added.

According to the boom operating device for a concrete pump vehicle of the present invention, the following excellent effects can be obtained.
(1) On the revolving frame on the vehicle body, the lowermost boom of the multi-stage boom is supported so that it can be raised and lowered so that each boom can be raised and lowered by the hydraulic cylinder for raising and lowering. Each hydraulic cylinder for expansion and contraction is expanded and contracted so that the connected pressure oil supply / discharge piping and the pressure oil supply / discharge piping on the vehicle body side communicate with each other through the oil passage of the oil pipe swing joint installed on the swing frame. In the boom operating device of a concrete pump vehicle that causes the boom to move up and down, the oil piping swivel joint with the slip ring device installed on the lower side is attached to and supported by the swivel frame, and each of the hoisting hydraulic cylinders is supported. An electromagnetic switching valve that switches between supply and discharge of pressure oil to and from the slip frame is installed at a position above the swing frame, and the slip ring device passes through the oil pipe swing joint. The electrical wiring led to the swivel frame is connected to the solenoid of each electromagnetic switching valve, and the oil passage of the swivel joint for oil piping is divided into two systems for pressure oil supply and pressure oil discharge. since thus the configuration and then are, an oil passage formed in the oil piping pivot joint for guiding the vehicle body onto the rotating frame, may be only two systems of exhaust and supply.
(2) With the above (1), the swivel joint for oil piping can be reduced in size and simplified, and an effective space can be secured on the swivel frame.
(3) The electrical wiring from the slip ring device installed on the lower side of the swivel joint for oil piping is transferred to the swivel frame through the wiring through hole provided in the axial direction at the required portion of the swivel cylinder of the swivel joint for oil piping. By adopting such a configuration, the wiring leading to the turning frame side is easy.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 to FIG. 3 show a case where the present invention is applied to a concrete pump vehicle equipped with a three-stage boom so as to be able to make a full turn as an embodiment of the present invention. Electrical wiring is made to the upper swing body A, which is the boom side, through a swivel joint 38 for oil piping that is a fully swivel type, and the hydraulic cylinders 9 and 10 for hoisting of each stage boom are connected to the upper swing body A side. 11 can be installed with solenoid switching valves 27, 28 and 29 as boom operation valves for switching between supply and discharge of pressure oil to the oil supply passage, and only two systems of supply and discharge are provided for the oil passage provided in the swivel joint 38 for oil piping. As a result, the boom hoisting hydraulic cylinders 9, 10, and 11 can be individually expanded and contracted by switching the electromagnetic switching valves 27, 28, and 29 on the upper swing body A side. It can be so

  More specifically, as in the case of the swivel joint 14 for oil piping shown in FIG. 5, as a cylindrical body in which a hole 17 for passing the concrete pipe 12 through the axial center is formed inside the fixed cylinder 15 as a cylindrical body. In the configuration in which the revolving cylinder 16 is concentrically arranged so as to be revolved, as shown in FIG. 5, in the case of a three-stage boom, a total of three boom raising and lowering hydraulic cylinders 9, 10, 11 are supplied and discharged. Instead of the oil pipe swivel joint 14 that has formed six systems (eight systems in the case of a four-stage boom), two systems of oil passages 39 and 40 for pressure oil supply and pressure oil discharge are used. As an example, the pressure oil connected to the tank 42 and the pressure oil supply pipe 43 on the discharge side of the oil pump 41 on the lower fixed side B is connected to the two pipe connection ports 39b and 40b opened at the lower end of the fixed cylinder 15. Each of the discharge pipes 44 is connected. Further, the pressure oil supply pipe 43a and the pressure oil discharge pipe 44a are connected to the two pipe connection ports 39a and 40a opened at the upper end of the swivel cylinder 16, and further, the required part of the swivel cylinder 16 is provided. The oil pipe swivel joint 38 is provided with a wiring through hole 45 penetrating in the axial direction.

  Further, a slip ring device 46 as an electric swivel joint is installed under the oil pipe swivel joint 38, and the slip ring device 46 is connected to the rotation side led so that power can be supplied from the fixed side to the rotation side. The electrical wiring 47 is routed upward through the wiring through hole 45 of the oil pipe swivel joint 38.

  By attaching and supporting the pivot joint 38 for oil piping with the slip ring device 46 installed on the lower side as described above to the central portion of the pivot frame 3, the electromagnetic switching valves 27, 28, 29 as boom operation valves are provided. It can be installed on the upper position of the swing frame 3, that is, on the upper swing body A side, and the hydraulic oil is supplied to the undulation hydraulic cylinders 9, 10, 11 via the electromagnetic switching valves 27, 28, 29. The pressure oil supply pipe 43a and the pressure oil discharge pipe 44a for supplying and discharging the pressure oil are connected to the pressure oil supply pipe 43 on the lower fixed side B through the two oil passages 39 and 40 of the swivel joint 38 for the oil pipe. A hydraulic circuit as shown in FIG. 1 that can be connected to the pressure oil discharge pipe 44 is provided. In addition, the electric wiring 47 led upward through the oil pipe swivel joint 38 is connected to the solenoid SOL. Of each electromagnetic switching valve 27, 28, 29. 1, SOL. 2, SOL. 3, SOL. 4, SOL. 5, SOL. 2, an electric circuit as shown in FIG. 2 is provided to switch the electromagnetic switching valves 27, 28, and 29 by exciting and demagnetizing the solenoid for each boom.

  FIG. 3 shows an example in which the swing joint 3 for oil piping and the slip ring device 46 are supported by the swing frame 3. That is, when the slip ring device 46 is installed on the lower side of the oil pipe swivel joint 38, the oil pipe swivel joint 38 is placed upward in the opening provided in the swivel center of the swivel frame 3 because of the installation space. A support member 49, which is positioned in a projecting position and mounted on a gantry 48 standing on the revolving frame 3, is attached to the upper end surface of the revolving cylinder 16 of the swivel joint 38 for oil piping, and the revolving cylinder 16 is revolved. It can be turned together with the frame 3. On the other hand, the fixed cylinder 15 of the swivel joint 38 for oil piping is configured to attach and support the flange portion 18 attached to the outer peripheral portion of the lower end portion by being attached to the fixing member 19 as in the case of FIG.

  The slip ring device 46 on the lower side of the swivel joint for oil pipe 38 has a cylindrical rotary cylinder 50 having a hole for passing the concrete pipe 12 in the center, which can be rotated (turned) inside the slip ring cover 51. The brush 53 is placed on the outer periphery of a large number of slip rings 52 that are insulated and attached to the rotary cylinder 50, and the brush 53 is supported by the slip ring cover 51 from the fixed-side electrical wiring 54. The rotating cylinder 50 is energized through a slip ring 52 and a conducting wire.

  In the slip ring device 46 having such a configuration, the slip ring cover 51 is attached to the fixing member 19 via the anti-rotation member 55 so as to be supported by the fixing member 19, and the rotating cylinder 50 has a flange attached to the upper end surface. 56 and a flange 57 attached to the lower end surface of the swivel cylinder 16 of the swivel joint 38 for oil piping are coupled to the swivel cylinder 16 so as to be able to swivel integrally with the swivel cylinder 16. Further, the lead wire on the rotating cylinder 50 side is used as an electric wiring 47 and is guided from the outside of the rotating cylinder 50 to the upper side of the turning frame 3 through the wiring through hole 45 of the turning cylinder 16 of the swivel joint 38 for oil piping. The solenoids of the switching valves 27, 28, 29 are connected as shown in the electric circuit diagram of FIG.

  Reference numeral 58 denotes a bearing that rotatably supports the rotary cylinder 50 on the slip ring cover 51.

  Since the boom operating device for a concrete pump vehicle according to the present invention has the above-described configuration, first, the concrete pipe 12 is loosely fitted to the swivel cylinder 16 of the oil pipe swivel joint 38 and the rotary cylinder 50 of the slip ring device 46. The electromagnetic switching valves 27, 28, 29 are installed on the swing frame 3, and the pressure oil supply and discharge pipes 43, 44 on the lower fixed side B as the vehicle body side are connected to the pressure on the upper swing body A side. The oil supply and discharge pipes 43a and 44a are connected via two systems of oil passages 39 and 40.

  Next, when the boom is turned by changing the concrete placement location or the like, the turning frame 3 on the body 1 of the concrete pump car is turned by a driving device (not shown). At this time, an oil pipe swivel joint 38 having the same configuration as that of the existing oil pipe swivel joint 14 is installed at the center of the swivel frame 3, and the oil pipe swivel joint 38 is disposed below the oil pipe swivel joint 38. Further, a slip ring device 46 as an electrical swing joint is installed, and a boom-side electrical wire 47 tangent to the fixed-side electrical wire 54 via the slip ring device 46 is connected to an oil piping swing joint 38. Therefore, the swivel 16 of the oil pipe swivel joint 38 and the rotary cylinder 50 of the slip ring device 46 can swivel together by the swivel operation of the swivel frame 3. Thus, the electric wiring 47 on the boom side can also turn together with the turning cylinder 16. Thereby, even if the turning frame 3 makes a full turn, an electric signal can be transmitted from the lower fixed side B to the upper turning body A side without damaging the electric wiring 47.

  When the boom is extended by operating the hoisting cylinders 9, 10, 11 from the folded and retracted state of the multi-stage boom, for example, the lower boom is raised sequentially from the hoisting hydraulic cylinder 9. When the undulating hydraulic cylinders 10 and 11 are individually extended and operated, first, the solenoid SOL. 1 is excited and solenoid SOL. 2 is controlled so as to demagnetize 2. As a result, the electromagnetic switching valve 27 is switched to the port a, and the pressure oil supplied through the pressure oil supply pipe 43a is supplied from the port a of the electromagnetic switching valve 27 to each head side pressure chamber of the two undulating hydraulic cylinders 9. Since each rod-side pressure chamber of the undulation hydraulic cylinder 9 is communicated with the pressure oil discharge pipe 44a, the undulation hydraulic cylinder 9 is operated to extend, The boom will be extended. Next, the solenoid SOL. 3 is energized and solenoid SOL. 4 is demagnetized, the electromagnetic switching valve 28 is switched to the port a, the pressure oil supply pipe 43a and the head side pressure chamber of the hoisting hydraulic cylinder 10 are communicated, and the pressure oil discharge pipe 44a Since the rod-side pressure chamber of the hoisting hydraulic cylinder 10 is communicated, the hoisting hydraulic cylinder 10 is extended and the second-stage boom is extended. Similarly, the solenoid SOL. 5 is excited and solenoid SOL. The undulation hydraulic cylinder 11 can be operated to extend by demagnetizing 6.

  On the contrary, when the booms are folded to bring the end of the boom close to the concrete pump car or when the booms are folded and stored, the solenoids of the electromagnetic switching valves 27, 28 and 29 are used. SOL. 2, SOL. 4, SOL. 6 and the solenoid SOL. 1, SOL. 3, SOL. 5 may be demagnetized so that each electromagnetic switching valve 27, 28, 29 is individually switched to the b port. As a result, the pressure oil is supplied to the rod-side pressure chambers of the hoisting hydraulic cylinders 9, 10, 11, the hoisting hydraulic cylinders 9, 10, 11 are shortened and the booms at the respective stages are shortened. It is done.

  In the above, each solenoid switching valve 27, 28, 29 is installed on the upper swing body A side, and each solenoid is excited by the electric wiring 47 wired on the upper swing body A side through the oil pipe swing joint 38. The oil passage 39, which connects the electromagnetic switching valves 27, 28, 29 on the upper swing body A side and the oil pump 41 on the lower fixed side B through the oil pipe swing joint 38. 40 can be only two systems, and the swivel joint 38 for oil piping can be reduced in size and simplified. In addition, since the electric wiring 47 is wired on the upper revolving unit A side, even the upper revolving unit A that can be fully swiveled includes an electrical device such as an angle sensor, a lighting device, an indicator lamp, Speakers, TV cameras, etc. can be easily installed.

  The present invention is not limited to the above embodiment. For example, the case where the slip ring device 46 is installed below the swivel joint 38 for oil piping has been shown. It can also be installed on the upper side of the swivel joint 38 for use. In this case, it is only necessary that the pressure oil supply and discharge pipes 43 and 43a be arranged along the rotary cylinder 50 of the slip ring device 46 located above, and in FIG. 1, it corresponds to a three-stage boom. Although the case where the undulating hydraulic cylinders 9, 10, and 11 are provided is shown, the invention can be similarly applied to a four-stage boom, and various modifications can be made without departing from the scope of the present invention. Of course.

1 is a hydraulic circuit diagram showing an embodiment of a boom operating device for a concrete pump truck according to the present invention. FIG. 2 is an electric circuit diagram for supplying power to an electromagnetic switching valve in the hydraulic circuit diagram of FIG. 1. FIG. 3 is a partially cut side view showing an outline of a configuration example of a pivot joint for oil piping and a slip ring device for realizing the hydraulic circuit diagram of FIG. 1 and the electric circuit diagram of FIG. 2. It is the schematic which shows an example of a concrete pump truck with a boom. It is a schematic side view of the swivel joint for oil piping used with the conventional concrete pump truck. It is a hydraulic circuit diagram of the conventional concrete pump truck. It is sectional drawing which shows typically the conventional turning connection apparatus which enabled it to wire a cable to the boom side of a concrete pump truck.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle body 3 Turning frame 5 Lower boom 6 Middle boom 7 Upper boom 8 Multistage boom 9, 10, 11 Hydraulic cylinder for hoisting 12 Concrete piping 15 Fixed cylinder 16 Turning cylinder 19 Fixed member 27, 28, 29 Electromagnetic switching valve 38 Oil piping use pivot joint 39 oil passage 40 an oil passage 43,43a pressure oil supply pipe 44,44a pressure oil discharge pipe 45 wiring through-hole 46 the slip ring device 47 electric wiring

Claims (2)

A bottom frame of a multi-stage boom is supported on a swing frame on the vehicle body so that the boom can be raised and lowered, and the boom of each stage can be raised and lowered by a hydraulic cylinder for raising and lowering, and the pressure connected to each hydraulic cylinder for raising and lowering Extend the hydraulic cylinders for undulations to extend the boom by connecting the oil supply / discharge piping and the pressure oil supply / discharge piping on the vehicle body side through the oil passages of the oil piping swivel joints installed on the swivel frame. In a boom operating device of a concrete pump vehicle designed to perform hoisting operation, an oil piping swivel joint with a slip ring device installed on the lower side is attached to and supported by the swivel frame, and the pressure to each hoisting hydraulic cylinder is the electromagnetic switching valve for switching the oil supply and discharge, handed through the pivot so as to install the upper position of the frame, and the oil pipe for turning the joint from the slip ring apparatus The electrical wiring led onto the frame, so as to be connected to the solenoid of each solenoid selector valve, further, the oil passage of the oil piping pivot joint, to a pressurized oil supply and two systems of pressure oil discharged A boom operating device for a concrete pump car characterized by that. Electrical wiring from the slip ring device installed on the lower side of the swivel joint for oil piping is led to the swivel frame through the wiring through hole provided in the axial direction at the required location of the swivel cylinder of the swivel joint for oil piping. The boom operating device for a concrete pump car according to claim 1.

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