JP2011163072A - Concrete pump vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a concrete pump vehicle which improves the working environment by making concrete placing operation silent, and eliminates the impairment of environmental health by preventing discharge of exhaust gas. <P>SOLUTION: In the concrete pump vehicle VC where a concrete pump P and a hydraulic pump Pu1 are mounted on the vehicle body F of the concrete pump vehicle VC and the concrete pump P is operated by hydraulic fluid discharged from the hydraulic pump Pu1, an electric motor M for driving the hydraulic pump Pu1 is mounted on the vehicle body F. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention includes a hydraulic pump, an electric motor that drives the hydraulic pump, and a concrete pump that is operated by pressure oil discharged from the hydraulic pump, and pumps ready-mixed concrete to a placement site such as a building site. The present invention relates to a concrete pump vehicle.

  Conventionally, a concrete pump vehicle is equipped with a concrete pump on its vehicle body, and the ready-mixed concrete discharged from the concrete pump is placed at a construction site or the like through a transfer pipe supported by a boom that can be raised and lowered on the vehicle body. The boom and the concrete pump are operated by pressure oil from a hydraulic pump driven by a traveling engine (internal combustion engine) of the vehicle via a PTO (power take-off device). (See Patent Document 1 below).

JP 2005-248627 A

  However, in the conventional concrete pump vehicle disclosed in Patent Document 1, when the concrete pump is operated at the time of placing the ready-mixed concrete, the engine must be continuously operated while the vehicle is stopped. In addition to the poor operating environment of the driving operation, there is a problem that environmental sanitation is harmed by the exhaust gas discharged by the continuous operation of the engine.

  The present invention has been made in view of this point, and provides a novel concrete pump vehicle that can solve the above-mentioned problem by enabling a hydraulic pump that drives the concrete pump to be driven by an electric motor. For the purpose.

In order to achieve the above object, the invention according to claim 1 is a concrete in which a concrete pump and a hydraulic pump are mounted on a vehicle body, and the concrete pump is operated by hydraulic oil discharged from the hydraulic pump. A pump vehicle,
An electric motor for driving the hydraulic pump is mounted on the vehicle body.

  In order to achieve the above object, the invention described in claim 2 is characterized in that in the apparatus described in claim 1, a power cable for supplying external power to the electric motor is provided.

  To achieve the above object, according to a third aspect of the present invention, in the first or second aspect of the present invention, the electric motor and a hydraulic pump driven by the electric motor are provided on one side of the vehicle body in the left-right direction. Further, a power control panel for supplying power to the electric motor is disposed on the other side of the vehicle body in the left-right direction.

In order to achieve the above object, the invention described in claim 4 is a concrete in which a concrete pump and a hydraulic pump are mounted on a vehicle body, and the concrete pump is operated by hydraulic oil discharged from the hydraulic pump. A pump vehicle,
The hydraulic pump includes a first hydraulic pump driven by an electric motor and a second hydraulic pump driven by an engine.

  In order to achieve the above object, according to a fifth aspect of the present invention, the first hydraulic pump and the second hydraulic pump according to the fourth aspect are configured so that when one of them is driven, the other is driven. Is not driven.

  According to the first aspect of the present invention, the concrete pump is operated by the hydraulic pump driven by the electric motor whose operation noise is quieter than that of the engine. The environment can be improved, exhaust gas is not generated, and environmental sanitation is not harmed.

  According to the second aspect of the present invention, the electric motor is driven by receiving electric power from an external power source, so that the concrete pump can be operated for a long time.

  According to the invention described in claim 3, the electric motor and the hydraulic pump driven by the electric motor on one side in the left-right direction of the vehicle body supply power to the electric motor on the other side in the left-right direction of the vehicle body. Since the power control panels are respectively arranged, heavy electric motors and hydraulic pumps and power control panels can be arranged in a balanced manner on the left and right sides of the vehicle body, and the running stability of the concrete pump vehicle is impaired. There is no.

  According to the fourth aspect of the present invention, the hydraulic pump for driving the concrete pump includes the first hydraulic pump driven by the electric motor and the second hydraulic pump driven by the engine. The concrete pump can also be operated if it fails and power cannot be supplied to the electric motor.

  According to the fifth aspect of the present invention, when one of the first hydraulic pump and the second hydraulic pump is driven, the other is not driven. It can prevent malfunction of hydraulic equipment due to rising oil temperature.

Plan view of concrete pump vehicle (first embodiment) FIG. 1 is a side view of the starboard side of the concrete pump vehicle as viewed in the direction of arrow 2 (first embodiment). 1 is a side view of a concrete pump vehicle on the port side as viewed from the direction of arrow 3 in FIG. 1 (first embodiment). Low-high pressure pumping mode switching relay circuit diagram (first embodiment) Working circuit diagram of concrete pump in low pressure pumping mode (first embodiment) Working circuit diagram of concrete pump in high pressure pumping mode (first embodiment) Hydraulic pump drive circuit diagram (second embodiment)

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below based on examples of the present invention shown in the accompanying drawings.

  First, the first embodiment of the present invention will be described with reference to FIGS.

  1 to 3, a base 1 is mounted on the front portion of a vehicle body F of a concrete pump vehicle, which is generally designated by reference numeral VC, and a support column 2 pivots about a vertical axis LL on the base 1. The multi-stage bending boom B is mounted on the upper end of the support column 2 so as to be freely bent up and down by a plurality of telescopic cylinders 3a to 3d. The multi-stage bending boom B is supported with a ready-mixed concrete pressure-feeding boom pipe 4, and the boom pipe 4 can be bent according to the bending and stretching of the multi-stage bending boom B.

  In addition, since the multistage bending boom B and boom piping 4 are conventionally well-known, detailed description is abbreviate | omitted.

  A reciprocating cylinder pump is mounted as a concrete pump P at the left and right center of the vehicle body F. This concrete pump P includes a hopper 6 and is configured so that the ready-mixed concrete put into the hopper 6 can be pumped to the outside from the discharge port 7 at the tip of the concrete pump P.

  A flexible pumping pipe 8 provided on the vehicle body F is detachably connected to the discharge port 7 of the concrete pump P. The pumping pipe 8 passes through the support column 2 and is connected to the base end of the boom pipe 4. The concrete pump P is detachably connected, and low-pressure (standard pressure) ready-mixed concrete is pumped through the boom pipe 4.

  In addition, as shown by a two-dot chain line in FIGS. 1 to 3, another discharge pipe 9 can be detachably connected to the discharge port 7 of the concrete pump P. Is detachably connected to a laying pipe 10 laid on the ground.

  This laying pipe 10 is not operated up and down together with the multistage bending boom B, is used along the ground, a low building, etc., is thicker and more robust than the boom pipe 4, and It is heavier than that, and high-pressure ready-mixed concrete is pumped from the concrete pump P through the laying pipe 10.

  As shown in FIGS. 1 and 3, an electric motor M and a first hydraulic pump Pu1 driven by the electric motor M are mounted on the star fender rear fender Fr of the vehicle VC. The first hydraulic pump Pu1 is a swash plate type variable displacement type, and is operated by supplying pressure oil to the concrete pump P.

  A second hydraulic pump Pu2 driven by a traveling engine (internal combustion engine) En of the vehicle VC via a PTO (power take-off device) is provided at the lower part of the center portion of the vehicle VC. This second hydraulic pump Pu2 is also a swash plate type variable displacement type, and is operated by supplying pressure oil to the concrete pump P.

  The first hydraulic pump Pu1 and the second hydraulic pump Pu2 can be driven separately.

  In addition, an electric cooling device Co is provided at the rear of the driver's seat on the starboard side of the vehicle, and this electric cooling device Co can be operated by electric power supplied from a power supply control panel Ec described later. The driver's seat can be cooled even when the traveling engine En is stopped (when the vehicle battery is not charged).

  As shown in FIGS. 1 and 2, a power supply control panel Ec is mounted on the rear fender Fl on the port side of the vehicle VC. The power supply control panel Ec includes the electric motor M, the electric cooling device Co, which will be described later. The pump drive means Dp, the valve switching drive means Dv, and the function of supplying electric power to other electrical devices and the function of controlling the motor M (control of the breaker, transformer, rectifier, motor control circuit, etc.) are combined. .

  A cord reel box Br is attached to the vehicle body F between the wheel bases (between the front wheel and the rear wheel) below the port side rear fender Fl, and the cord reel 16 accommodated therein is connected to the power control panel Ec. A plurality of power cables 17 to be connected are wound, and the plug sockets 17c at the tips of these power cables 17 are inserted into an external power socket S provided at a construction site, and external power is supplied to the power control panel Ec. (See FIGS. 5 and 6).

  Since the cord reel box Br is disposed between the wheel bases (between the front wheel and the rear wheel), the cord reel box Br can be disposed at a low position below the vehicle body F. When the vehicle VC is running, the cord reel box Br contacts the ground. The power cable 17 can be easily taken out and stored because it can be arranged at a low position.

  On the starboard side rear fender Fr of the vehicle VC, the heavy electric motor M and the first hydraulic pump Pu1 are arranged, and on the port side rear fender Fl, the heavy power supply control panel Ec is arranged. Thus, the left and right weight balance of the vehicle VC is good, and its running stability is good.

  As shown in FIGS. 1 to 3, the multistage bending boom B is provided with boom position detecting means Se for detecting the position thereof. The boom position detection means Se includes a turning sensor Se1 that detects a turning angle in the left-right direction of the multi-stage bending and extending boom B, and an angle sensor Se2 that detects the undulation angle. A turning sensor Se1 is provided between the base end of the base 1 and the support pillar 2, and this turning sensor Se1 includes a proximity sensor 12 provided on the base 1 and a dog 13 provided on the support pillar 2. Thus, when the support column 2 is at a small angle (5 °) or less to the left and right with respect to the vertical center line LL of the palm frame F together with the multistage bending boom B with respect to the base 1, the ON operation is performed. It has become. In addition, an angle sensor Se2 is provided at the base end of the multi-stage bending / extending boom B, and the angle sensor Se2 is configured so that the multi-stage bending / extending boom B has an elevation angle from a prone position of a small angle (10 °) or less. It is turned on at some time.

  Next, a relay control circuit for selectively switching control between a low pressure (standard pressure) operation in which the concrete pump P is pumped through the boom pipe 4 and a high pressure operation in which the concrete pump P is pumped through the laying pipe 10 will be described with reference to FIG. explain.

  The power supply circuit 90 to which the main switch MS is connected includes a circuit 91 in which the turning sensor Se1 and a relay CR1 excited by the ON operation of the sensor Se1 are connected in series, and the angle sensor Se2 and the sensor Se2 ON. A circuit 92 in which a relay CR2 excited in operation is connected in series, a circuit 93 in which normally-open relay switches Cr1, Cr21 and a relay CR3, which are turned on by excitation of the relays CR1 and CR2, are connected in series; A concrete pump operation switch S1, a circuit 94 in which a concrete pump operation circuit is connected in series, a manual concrete pump high / low pressure changeover switch S2, a normally open relay switch Cr3 which is turned on by excitation of the relay CR3, , The first and second high and low pressure electromagnetic switching valves V1, V2 (FIG. 5) arranged in parallel. Solenoid 6 reference) SOL1, the circuits 95 connected to solenoid SOL2 in series are connected in parallel.

  The main switch MS, the concrete pump operation switch S1, and the concrete pump high / low pressure changeover switch S2 are provided in a concrete pump operation panel (not shown) provided in the driver's seat of the concrete pump vehicle VC.

  When the turning sensor Se1 and the angle sensor Se2 are turned on with the main switch MS, the concrete pump operation switch S1, and the concrete pump high / low pressure switch S2 turned on, the relays CR1 and CR2 are excited, and the relay switch Cr1 , Cr1 is turned on, the relay CR3 is excited and the relay switch Cr3 is turned on, so that the solenoids SOL1, SOL2 of the first and second high / low pressure electromagnetic switching valves V1, V2 are excited and are on the high pressure operation side (see FIG. 6). Switch to.

  Next, the concrete pump P and its hydraulic drive circuit will be described with reference to FIGS.

  The concrete pump P is a hydraulically driven reciprocating piston pump and includes a pair of pump cylinders 20 and 30 arranged in parallel with each other. The drive cylinders 21 and 31 are integrally connected via the center frame 40. The pump pistons 22 and 32 that are slidably fitted in the pair of pump cylinders 20 and 30, respectively, and the drive pistons 23 and 33 that are slidably fitted in the drive cylinders 21 and 31, respectively. The piston rods 24 and 34 that slidably penetrate the frame 40 are integrally connected to each other. The drive pistons 23 and 33 divide the corresponding drive cylinders 21 and 31 into front oil chambers 21a and 31a on the piston rod side and base oil chambers 21b and 31b on the piston side.

  The hopper 6 is connected to the tip of the pair of pump cylinders 20 and 30. The hopper 6 is supplied with ready-mixed concrete as needed from a concrete mixer truck or the like, and serves as a supply source of the concrete pump P. Further, the discharge port 7 is opened in the front surface of the hopper 6, and a curved tubular S-shaped valve (oscillating tube) 15 is accommodated and supported in the lower portion of the hopper 6. The S-shaped valve 15 is rotatable about the axis of the rotation support shaft 16 integral therewith, and the front portions of the pair of pump cylinders 20 and 30 can be alternately switched and communicated with the discharge port 7.

  The rotation support shaft 16 is connected to a valve switching drive means Dv (known in the art) for switching the S-shaped valve 15 by rotating it in synchronism with the operation of both pump pistons 22 and 32. The During operation of the concrete pump P, the valve switching drive means Dv discharges a pair of pump cylinders 20 and 30 that is in a state of sucking ready-mixed concrete into the hopper 6 and that in a state of pumping ready-mixed concrete. The S-shaped valve 15 is switched and controlled so as to be alternately connected to the outlet 7 to smoothly feed the ready-mixed concrete.

  A pair of limit switches 25 and 35 are provided on the front side of the pair of drive cylinders 21 and 31, respectively, and an operation signal of these limit switches 25 and 35 is input to the valve switching drive means Dv. As a result, the S-shaped valve 15 is switched. Further, the control hydraulic pressure generated by the valve switching operation of the valve switching drive means Dv is supplied as pilot hydraulic pressure to the operation portion of the switching valve V, which will be described later, via the pilot oil passages 43 and 44, and the switching valve V is switched. .

  The two ports p1 and p2 on the inlet side of the switching valve V for switching the pair of pump cylinders 20 and 30 so as to mutually operate are connected to the discharge oil passage 50 and the reflux oil passage 70, respectively. The discharge oil passage 50 is connected in parallel to the discharge side of the first hydraulic pump Pu1 (driven by the electric motor M) and the second hydraulic pump Pu2 (driven by the engine En) and a relief valve 45. The recirculation oil passage 70 is in communication with the oil tank T, and the suction sides of the first and second hydraulic pumps Pu1 and Pu2 are in communication with the oil tank T.

  The two ports p3 and p4 on the outlet side of the switching valve V are connected to the hydraulic oil passages 51 and 61, respectively. One hydraulic oil passage 51 is branched into a front oil passage 52 and a base oil passage 53, and the front oil passage 52 communicates with the front oil chamber 21a of the drive cylinder 21 via the direction control valve v1. The base side oil passage 53 communicates with the base oil chamber 31b of the drive cylinder 31 via the direction control valve v2.

  The other second hydraulic oil passage 61 is branched into a front-side oil passage 62 and a base-side oil passage 63, and the front-side oil passage 62 is connected to the front oil of the drive cylinder 31 via the direction control valve v3. The base side oil passage 63 is communicated with the base oil chamber 21b of the drive cylinder 21 via the direction control valve v4. The front-side oil passages 52 and 62 are communicated with each other by a communication oil passage 65 having a direction control valve v <b> 5 interposed therebetween, and a direction control valve v <b> 6 is connected to the middle of the base-side oil passage 63.

  A pilot oil passage 80 is connected to the discharge oil passage 50. The pilot oil passage 80 is branched into a pilot oil passage 81 and a pilot oil passage 82. The pilot oil passage 81 is switched to a first high / low pressure electromagnetic switch. Via the valve V1, the control oil chambers of the direction control valves v1, v2, v6 or the return oil passage 84 opened to the oil tank T are selectively switched and communicated. The pilot oil passage 82 is switched and communicated to the control oil chambers or oil tanks T of the direction control valves v3, v4, v5 via the second high / low pressure electromagnetic switching valve V2. When the pump hydraulic pressure acts on the control oil chambers of the direction control valves v1 to v6 as the pilot hydraulic pressure via the pilot oil passage 81 or the pilot oil passage 82, the valves v1 to v6 are held in a locked state.

  A logic valve CH as a check valve is connected in the middle of the discharge oil passage 50 connected to the discharge sides of the variable displacement type first hydraulic pump Pu1 and the second hydraulic pump Pu2. The valve CH prevents hydraulic fluid flowing through the discharge oil passage 50 from flowing back from the hydraulic cylinders 21 and 31 to the first and second hydraulic pumps Pu1 and Pu2.

  The first hydraulic pump Pu1 is driven by an electric motor M, the electric motor M is driven by a current supplied from the power supply control panel Ec, and the second hydraulic pump Pu2 is driven by a vehicle CV. Is driven by a traveling engine (internal combustion engine) En via a PTO (power take-off device).

  The first and second hydraulic pumps Pu1 and Pu2 are controlled by pump driving means Dp that is operated by power supply from the power supply control panel Ec.

  When both the first hydraulic pump Pu1 and the second hydraulic pump Pu2 are in a drivable state and the concrete pump P is operated, the pump driving means Dp includes the first hydraulic pump Pu1 and the second hydraulic pump. The drive of the pump Pu2 is controlled as follows. That is, the pump driving device Dp controls the swash plate (flow control plate) of the pump Pu2 so that the discharge flow rate of the second hydraulic pump Pu2 becomes zero when detecting the driving of the electric motor M. In addition, when detecting the connection of the PTO connection / disconnection detection sensor Sp, the swash plate (flow rate control plate) of the pump Pu1 is controlled so that the discharge flow rate of the first hydraulic pump Pu1 becomes zero, Prevents hydraulic fluid temperature from rising.

  Next, the operation of this embodiment will be described.

  The concrete pump P is normally operated by a first hydraulic pump Pu1 driven by an electric motor M. At this time, the second hydraulic pump Pu2 is not driven by stopping the operation of the engine En.

  The vehicle CV is stopped at the ready concrete placement site, the power cable 17 connected to the power control panel Ec is pulled out from the cord reel 16, and the outlet 17c is connected to the external power socket S provided at the construction site. As a result, the electric motor M is driven by the external power supplied from the power control panel Ec, and the first hydraulic pump Pu1 can be operated by the external power.

  First, the case where the concrete pump P is operated in the low pressure (standard pressure) pumping mode will be described with reference to FIG.

  By the operation of the first hydraulic pump Pu1 driven by the electric motor M, the concrete pump P is operated at a low pressure, and the low-pressure (standard pressure) ready-mixed concrete is pumped from the discharge port 7 to the boom pipe 4.

  The multi-stage bending / extension boom B is in a turning and standing state, both the turning sensor Se1 and the angle sensor Se2 are OFF, and the solenoids SOL1 and SOL2 of the high and low pressure electromagnetic switching valves V1 and V2 are both de-energized, As shown in FIG. At this time, the pilot hydraulic pressure from the first hydraulic pump Pu1 acts on the control hydraulic chambers of the direction control valves v2, v4, and v5, and these valves v2, v4, and v5 are held in the locked state. The pressure oil from one hydraulic pump Pu1 flows as shown by the arrows in FIG. That is, the pressure oil is pumped to the front oil chamber 21 a of the drive cylinder 21, and the oil in the front oil chamber 31 a of the drive cylinder 31 is returned to the oil tank T. The oil in the base oil chamber 21 b of the drive cylinder 21 is sent to the base oil chamber 31 b of the drive cylinder 31. Accordingly, the pump piston 32 of one pump cylinder 30 moves forward and the pump piston 22 of the other pump cylinder 20 moves backward, so that the ready-mixed concrete in the hopper 6 is sucked into the pump cylinder 20 and the fresh piston in the pump cylinder 30 is also released. Concrete is pumped from the discharge port 7 to the boom pipe 4.

  When the limit switch 35 is operated at the forward limit of the drive piston 33 of one drive cylinder 31, the signal is input to the valve switching drive means Dv to switch the S-shaped valve 15 and from the valve switch drive means Dv. The control oil pressure is supplied to the switching valve V as a pilot oil pressure through the pilot oil passage 44, and the valve V is switched to the right side in FIG. As a result, the pressure oil from the first hydraulic pump Pu1 can be pumped to the front oil chamber 31a of one drive cylinder 31, and the hydraulic oil in the front oil chamber 21a of the other drive cylinder 21 is returned to the oil tank T. It is. Also, the oil in the base oil chamber 31b of one drive cylinder 31 enters the base oil chamber 21b of the other drive cylinder 21, and the pump piston 22 of the pump cylinder 20 advances and the pump cylinder 30 conversely to the case described above. Since the pump piston 32 is moved backward, the ready concrete in the hopper 6 is sucked into the pump cylinder 30 and the ready concrete in the pump cylinder 20 is pressure-fed from the discharge port 7 to the boom pipe 4. When the limit switch 25 is actuated at the forward limit of the drive piston 23 of the drive cylinder 21, the signal is input to the valve switching drive means Dv to switch the S-shaped valve 15 and the control hydraulic pressure from the valve switch drive means Dv. Passes through the pilot oil passage 43 as pilot hydraulic pressure and is supplied to the electromagnetic switching valve V, which is again switched to the left side in FIG.

  As described above, the dredge operation of the pair of pump cylinders 20 and 30 is continued and the concrete pump P is operated. In the operation of the concrete pump P in the low pressure (standard pressure) pumping mode, as described above, the first pump cylinder 20 and 30 is operated. The pressure oil from the hydraulic pump Pu1 is supplied to the front oil chambers 21a and 31a of the pair of drive cylinders 21 and 31. Thus, the pressure receiving areas on the front oil chambers 21a, 31a side (rod side) of the drive pistons 23, 33 are smaller than the pressure receiving areas on the base oil chambers 21b, 31b side (piston side). 21 and 31 are driven at a low pressure, whereby the low-pressure ready-mixed concrete is pumped from the discharge port 7 to the boom pipe 4. Therefore, in the operation of the concrete pump P in this low pressure (standard pressure) pumping mode, the boom pipe 4 formed to be thin to reduce the weight cannot withstand the pumping pressure of the ready-mixed concrete, and is damaged or disconnected. There is no such thing as happening.

  Next, the case where the concrete pump P is operated in the high pressure mode will be described with reference to FIG.

  The concrete pump P is operated at high pressure by the pressure oil from the first hydraulic pump Pu1 driven by the electric motor M, and the high-pressure ready-mixed concrete is pumped from the discharge port 7 to the laying pipe 10. The multistage bending boom B is in the retracted position and is not turned (5 ° or less from the center line of the vehicle) and is not standing (10 ° or less from the position where the bending boom is laid down). In this case, the turning sensor Se1 and Since the angle sensor Se2 is turned on and the relay circuit shown in FIG. 4 is closed, the solenoids SOL1 and SOL2 of the first and second high and low pressure electromagnetic switching valves V1 and V2 are both excited. As shown in FIG. 6, it switches to the right position. As a result, the pilot hydraulic pressure from the first hydraulic pump Pu1 acts on the control hydraulic chambers of the direction control valves v1, v3, and v6, and these valves v1, v3, and v6 are held in the locked state. Pressure oil from one hydraulic pump Pu1 flows as shown by arrows in FIG. That is, the pressure oil is pumped to the base oil chamber 31 b of one drive cylinder 31, and the oil in the base oil chamber 21 b of the other drive cylinder 21 is returned to the oil tank T. Further, the front oil chamber 31a of the drive cylinder 31 and the front oil chamber 21a of the drive cylinder 21 are communicated with each other. As a result, the pump piston 32 of one pump cylinder 30 moves forward and the pump piston 22 of the other pump cylinder 20 moves backward, so that the ready-mixed concrete in the hopper 6 is sucked into the pump cylinder 20 and the pump cylinder 30 is moved into the pump cylinder 30. The ready-mixed concrete is pumped from the discharge port 7 to the laying pipe 10. The limit switch 35 is operated at the forward limit of the drive piston 33 of the drive cylinder 31, and as described above, the switching valve V is switched to the right side in FIG. 6, and this time, the pressure oil from the first hydraulic pump Pu1 is supplied to the drive cylinder. The oil in the base oil chamber 31 b of the drive cylinder 21 is returned to the oil tank T while being pumped to the base oil chamber 21 b of 21. Further, the front oil chamber 21a of the drive cylinder 21 and the front oil chamber 31a of the drive cylinder 31 are communicated with each other. As a result, the pump piston 22 of the pump cylinder 21 moves forward and the pump piston 32 of the pump cylinder 31 moves backward, so that the ready concrete in the hopper 6 is sucked into the pump cylinder 30 and the ready concrete in the pump cylinder 20 is discharged. It is pumped from the outlet 7 to the laying pipe 10. When the limit switch 25 is operated at the forward limit of the drive piston 23 of the drive cylinder 21, the signal is input to the valve switching drive means Dv to switch the S-shaped valve 15, and the control oil pressure from the valve switch drive means Dv. Passes through the pilot oil passage 43 and switches the switching valve V to the left side in FIG. 6 again. Thus, the saddle operation of the pair of pump cylinders 20 and 30 is continued. In the operation of the concrete pump P in the high pressure pumping mode, as described above, the pressure oil from the first hydraulic pump Pu1 is alternately supplied to the base oil chambers 21b and 31b of the pair of drive cylinders 21 and 31. In this case, the pressure receiving area of the base oil chambers 21b, 31b (piston side) of the drive pistons 23, 33 is larger than the pressure receiving area of the drive pistons 23, 33 on the front oil chambers 21a, 31a side (rod side). The pair of drive cylinders 21 and 31 are driven at a high pressure, whereby the high-pressure ready-mixed concrete from the concrete pump P is pumped from the discharge port 7 to the laying pipe 10. Therefore, in the operation of the concrete pump P in this high-pressure pumping mode, the ready-mixed concrete can be pumped efficiently at a high pressure through the laying pipe 10 that is formed to be relatively thick and has no fear of rupture.

  Further, the check valve CH provided on the downstream side of the branch portion of the branch oil passage 11 of the discharge oil passage 50 prevents the drive pistons 23 and 33 from self-running due to the weight of the ready-mixed concrete.

  In FIG. 4, the concrete pump high / low pressure changeover switch S2 connected to the circuit 95 is provided because it is necessary to place the ready-mixed concrete using the laying pipe 10 in the low pressure (standard) pumping mode.

  As described above, the concrete pump P can be automatically switched between the low pressure (standard) pumping mode and the high pressure pumping mode based on the detection of the position of the multi-stage bending boom B, that is, the detection result of the turning position and the angular position. it can.

  In addition, when it is difficult to supply external power from the power source at the construction site, power is supplied from the battery mounted on the vehicle CV to the electric motor M.

  When the electric motor M breaks down or power cannot be supplied to the electric motor M, the second hydraulic pump Pu2 driven by the engine En in place of the first hydraulic pump Pu1 is temporarily used. The concrete pump P can be operated in the low pressure and high pressure pumping modes.

  The operation of the concrete pump P by the second hydraulic pump Pu2 is the same as that by the first hydraulic pump Pu1.

  Next, a second embodiment of the present invention will be described with reference to FIG.

  In FIG. 7, the same components as those in the first embodiment are denoted by the same reference numerals.

  In the second embodiment, the concrete pump P can be operated by a single hydraulic pump Pu ′ driven by either the engine En or the electric motor M. The discharge port of the hydraulic pump Pu ′ is connected to the hydraulic drive circuit (FIGS. 5 and 6) of the same concrete pump P as in the first embodiment through the discharge oil passage 50, and the suction port is connected to the oil tank T. The

  The drive shaft of the hydraulic pump Pu ′ is connected to the electric motor M via the electromagnetic clutch Cl and to the engine En via the PTO. The contact detection sensor Sc of the electromagnetic clutch Cl and the contact detection of the PTO are detected. The detection signals of the sensor Sp, the drive detection sensor Sm of the electric motor M, and the detection sensor Sn of the engine En are input to the pump drive means Dp ′, and are controlled by control signals output from the pump drive means Dp ′. The electromagnetic clutch Cl and PTO are controlled to be connected and disconnected, and the electric motor M is controlled to be driven and stopped.

  The pump drive means Dp ′ controls the cutting of the PTO if the hydraulic pump Pu ′ is being driven by the electric motor M, and the electromagnetic clutch if the hydraulic pump Pu ′ is being driven by the engine En by the connection of the PTO. Cleavage control of Cl. By controlling in this way, the hydraulic pump Pu ′ can be driven separately by the electric motor M and the engine En, and the driving of both the electric motor M and the engine En is reliably prevented, and the hydraulic pump Pu ′, Damage and breakage of the engine En and the electric motor M are prevented.

  Thus, the second embodiment also has the same effects as the first embodiment.

As mentioned above, although the Example of this invention was described, this invention is not limited to the Example, A various Example is possible within the scope of the present invention. For example,
(1) In the above embodiment, the pump drive means Dp and Dp ′ are provided separately from the valve drive switching means Dv. However, these may be combined into pump drive and valve drive switching means.

  (2) In the above embodiment, the pump driving means Dp controls the swash plate so that the discharge amount of the second hydraulic pump Pu2 becomes zero when the driving of the electric motor M is detected. Alternatively, the swash plate may be controlled so that the discharge amount of the second hydraulic pump Pu2 becomes zero and the PTO may be cut when the driving command of the electric motor M is output. Good.

  (3) In the above embodiment, the pump drive means Dp controls the swash plate so that the discharge amount of the first hydraulic pump Pu1 becomes zero when the connection detection of the PTO connection detection sensor is detected. Alternatively, the swash plate may be controlled so that the discharge amount of the first hydraulic pump Pu1 becomes zero when it is detected that the PTO is connected and the engine En is rotating, or the first hydraulic pump Pu1. The driving force may not be transmitted. For example, the electric motor M is stopped. The electric motor M and the first hydraulic pump Pu1 are connected via an electromagnetic clutch, and the electromagnetic clutch is disconnected.

  (4) In the above embodiment, the driving of the first hydraulic pump Pu1, the second hydraulic pump Pu2 and the hydraulic pump Pu ′ is directly detected. Instead, a flow sensor or the like is provided at the discharge port of these pumps. Other sensors may be provided to detect their discharge and detect their driving.

  (5) In the above embodiment, the electric motor M is driven by an external power source or a vehicle-mounted battery, but it may be driven by an external battery instead.

  (6) In the above embodiment, the case where the reciprocating cylinder pump is used as the concrete pump has been described. Alternatively, a squeeze rotary pump may be used, and in this case, the rotary pump is driven. A hydraulic pump for supplying pressure oil to the hydraulic motor to be driven may be driven by an electric motor.

En ... Engine Ec ... Power control panel F ... Car body M ... Electric motor P ... .... Concrete pump Pu1 ... Hydraulic pump (first hydraulic pump)
Pu2 ･ ･ ･ Hydraulic pump (second hydraulic pump)
Pu ′ ・ ・ ・ ・ ・ ・ Hydraulic pump 17 ・ ・ ・ ・ ・ ・ ・ ・ Power cable

Claims (5)

A concrete pump (P) and a hydraulic pump (Pu1; Pu ′) are mounted on the vehicle body (F), and the concrete pump (P) is operated by hydraulic oil discharged from the hydraulic pump (Pu1; Pu ′). A concrete pump vehicle designed to
A concrete pump vehicle comprising an electric motor (M) for driving the hydraulic pump (Pu1; Pu ′) mounted on the vehicle body (F).   The concrete pump vehicle according to claim 1, further comprising a power cable (17) for supplying external electric power to the electric motor (M).   The electric motor (M) and a hydraulic pump (Pu1; Pu ′) driven by the electric motor (M) and the hydraulic pump (Pu ′; Pu ′) driven by the electric motor (M) are arranged on one side of the vehicle body (F). The concrete pump vehicle according to claim 1 or 2, wherein a power control panel (Ec) for supplying electric power to the motor (M) is arranged. A concrete pump (P) and hydraulic pumps (Pu1, Pu2) are mounted on the vehicle body (F), and the concrete pump (P) is operated by hydraulic oil discharged from the hydraulic pumps (Pu1, Pu2). A concrete pump vehicle,
The hydraulic pumps (Pu1, Pu2) are composed of a first hydraulic pump (Pu1) driven by an electric motor (M) and a second hydraulic pump (Pu2) driven by an engine (En). A concrete pump vehicle.   The concrete pump vehicle according to claim 4, wherein when one of the first hydraulic pump (Pu1) and the second hydraulic pump (Pu2) is driven, the other is not driven.

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