GB2103339A - Control device for controlling the hydraulic means for driving the mixing drum of a mix truck - Google Patents
Control device for controlling the hydraulic means for driving the mixing drum of a mix truck Download PDFInfo
- Publication number
- GB2103339A GB2103339A GB08213557A GB8213557A GB2103339A GB 2103339 A GB2103339 A GB 2103339A GB 08213557 A GB08213557 A GB 08213557A GB 8213557 A GB8213557 A GB 8213557A GB 2103339 A GB2103339 A GB 2103339A
- Authority
- GB
- United Kingdom
- Prior art keywords
- speed
- control device
- motor
- mixing drum
- lever
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/42—Apparatus specially adapted for being mounted on vehicles with provision for mixing during transport
- B28C5/4203—Details; Accessories
- B28C5/4206—Control apparatus; Drive systems, e.g. coupled to the vehicle drive-system
- B28C5/422—Controlling or measuring devices
Abstract
A control device for controlling the means for driving the mixing drum (1) of a vehicle provided with a mixing drum, the driving means comprising a variable-displacement hydraulic pump (5) driven by an engine (6), a hydraulic turbine (3), and a transmission (2), and the control device comprises a manually operable lever (11), which is connected to the adjusting lever (7) of the variable-displacement pump (5) so as to control the speed of the mixing drum. The manually operable lever (11) is movable into contact with either of two contacts (12, 13) to actuates solenoid operated valve (14) which supplies compressed air to a cylinder (15) whose piston rod (17) acts on a lever (9) adjusting fuel supply to the engine (6). Thus the speed of the engine is increased as the displacement of the pump is increased, although in the construction shown the engine speed will remain constant during subsequent increases in pump displacement (and consequent increases in drum speed). <IMAGE>
Description
SPECIFICATION
Control device for controlling the means for driving the mixing drum of a mix truck
This invention relates to a control device for controlling the means for driving the mixing drum of a vehicle provided with a rotatable mixing drum, which driving means comprise a variabledisplacement hydraulic pump driven by a motor, a hydraulic turbine, and a transmission, which control device comprises a manually operable lever, which serves to set the speed of the mixing drum and is connected to the adjusting lever of the variabledisplacement pump.
In a vehicle provided with a mixing drum, the variable-displacement hydraulic pump for supplying hydraulic fluid to the hydraulic turbine is driven by the drive motor of the vehicle or by a separate motor. These motors are usually diesel engines. In such an arrangement the rotational speed of the mixing drum depends on the speed ofthe diesel engine, which is varied by operating an adjusting lever of the fuel injection pump, and on the displacement of the variable-displacement hydraulic pump, which can also be changed by means of an adjusting lever.Such vehicles having a mixing drum are usually provided at their rear with two pivoted levers, which are manually operable and connected by Bowden cables to the adjusting levers of the fuel injection pump and of the variable-displacement hydraulic pump and can be actuated to set the motor speed and the displacement of the variabledisplacement pump, respectively. As the capacity of the variable displacement hydraulic pump depends on the speed of the pump shaft, such speed corresponding to the motor speed, and on the position of the adjusting lever of the variabledisplacement pump, a desired drum speed can be obtained by any desired number of combinations of positions of the manually operable levers if the diesel engine operates within a speed range in which it delivers an adequate power.As the speed of the mixing drum can be influenced by both manually operable levers, errors of the operator cannot be precluded. For instance, a certain drum speed can be obtained in that the diesel engine operates at a speed which is higher than necessary so that the displacement of the variable-adjustment pump is reduced and the noise, the fuel consumption and the wear are higher than required. On the other hand, the operation of the motor at a low speed when the variable-displacement pump operates with a large displacement could cause the diesel engine to be stalled.
The present invention aims to provide a control device of the kind described first hereinbefore and in which any desired drum speed can be selected by the actuation of a single control lever so that the adjusting levers of the variable-displacement pump and the fuel injection pump will be positioned in optimum ranges.
According to the present invention there is provided a control device for controlling the means for driving the mixing drum of a vehicle provided with a mixing drum, which driving means comprise a variable-displacement hydraulic pump driven by a motor, a hydraulic turbine, and a transmission, in which said control device comprises a manually operable lever, which serves to set the speed of the mixing drum and is connected to the adjusting lever of the variable-displacement pump, said manually operable lever also being connected to the control element of the motor for selecting the speed of the motor in such a manner than the motor speed increases as the displacement of the pump increases.
In a control device of the kind described first herein before that object is accomplished in that the manually operable lever is also connected to the control element for selecting the speed of the motor in such a manner that the motor speed increases as the displacement of the pump increases. In the control device according to the invention, the manually operable lever is directly connected to the adjusting lever of the variable-displacement pump, so that said adjusting lever will be adjusted by an operation of the manually operable lever, and the latter is also connected to the control element for selecting the speed of the motor, usually to the adjusting lever for the fuel injection pump, in such a manner that each position of the adjusting lever of the fuel injection pump has coordinated with itthe minimum speed of the engine which corresponds to that position so that the variable-displacement pump will always be driven with a power which is just sufficient.
In response to a movement of the manually operable leverfrom its neutral position the engine usually runs up to its minimum speed. Investigations of the drive means have surprisingly shown that in may cases the drive motor is so strong that even the highest power for driving the mixing drum can be obtained when the diesel engine is operating at a rather low speed or even at the minimum speed. It may be sufficient, for instance, to accelerate the diesel engine from the idling speed, which may be about 800 revolutions per minutes, to the minimum driving speed of e.g. 1100 revolutions per minute and then to select the drum speed only by an adjustment of the adjusting lever of the variabledisplacement pump. Such a mode of operation ensures an optimum efficiency.
When the manually operable lever has been operated to cause the motor to operate at its minimum driving speed or at another constant driving speed, the drum speed can be selected by the operation of the manually operable lever and a resulting adjustment of the adjusting lever of the variable-displacement pump in such a manner that certain drum speeds are coordinated with certain positions of the manually operable lever so that a scale indicating drum speeds can be associated with that manually operable lever.
According to a further feature of the invention the manually operable lever can be moved from its neutral position to a closely adjacent position corresponding a low drum speed whereas the motor speed is not increased. That position can be used for agitating the mix by the drum rotating at low speed while the truck is travelling. For such agitation, the idling speed of the vehicle motor is sufficient. That idling speed must be selectable during gearshifts while the truck is travelling.
The control positions or control ranges may be defined by electric contacts which control the actuation of a solenoid operated valve, which supplies pressure fluid to a fluid-operable piston-cylinder unit for adjusting the control element of the motor. A camwheel or the like may be provided, which is moved by the manually operable lever and which determines for the control element for controlling the speed of the motor an optimum position depending on the position of the adjusting lever of the variable-displacement pump.
An illustrative embodiment of the invention will now be described, by way of an example, with reference to the accompanying drawing, in which the single figure diagrammatically illustrates a control device according to the present invention.
The mixing drum 1 is rotatably mounted in known manner on the chassis of a vehicle and is driven by a plane:arygeartrain provided in a push-on gear unit 2 and aflange-connected hydraulic turbine 3. Oil under pressure is supplied to the hydraulic turbine 3 from a variable displacement piston pump 5 through high-pressure conduits 4. The shaft of the pump 5 is driven by a diesel engine 6 of the vehicle. The reciprocating variable-displacement piston pump 5 is provided with an adjusting lever 7. The fuel injection pump 8 of the diesel engine 6 is provided with an adjusting lever 9 connected to the accelerator pedal of the vehicle.The adjusting lever 7 of the reciprocating variable-displacement piston pump 5 is connected to a manually operable control lever 11 in such a mannerthattheadjusting lever7will be moved in the same sense as the lever 11. When the lever 11 is moved from its neutral position in the direction "discharging" or mixing and has traversed through a small dead angle, it will contact and close one of two contacts 12, 13 so that a solenoid operated valve 14 will be actuated to supply compressed airfrom an airvessel 16to a pneumatic piston and cylinder device 15. As a result, the piston rod 17 of the piston and cylinder device 15 moves the adjusting lever 9 of the fuel injection pump 8 to a position which corresponds to the minimum driving speed of the diesel engine 6. The adjusting lever 9 is moved to this position when the drum 1 is to be rotated at low speed, e.g. at 5 revolutions per minute. The speed of the engine 6 need not be increased for higher drum speeds bcause the power delivered by the engine 6 is sufficient so that the desired drum speed can be selected merely by an adjustment of the control element 7 of the variabledisplacement pump 5 by the lever 11. As a given position of the lever 11 is coordinated with a desired drum speed, a scale which indicates drum speeds may be associated with the lever 11.
Claims (11)
1. A control device for controlling the means for driving the mixing drum of a vehicle provided with a mixing drum, which driving means comprise a variable-displacement hydraulic pump driven by a motor, a hydraulic turbine, and a transmission, in which said control device comprises a manually operable lever, which serves to set the speed of the mixing drum and is connected to the adjusting lever of the variable-displacement pump, said manually operable lever also being connected to the control element of the motor for selecting the speed of the motor in such a manner that the motor speed increases as the displacement of the pump increases.
2. A control device as claimed in claim 1, in which the motor is caused to run at its minimum driving speed in response to a movement of the manually operable lever away from a neutral position.
3. A control device as claimed in claim 1 and claim 2, in which the manually operable lever is movable in the direction "discharging" and to the position "mixing" only to one switching position for selecting a predetermined speed of the motor.
4. A control device as claimed in any preceding claim, in which the lever is movable in a sense for increasing the drum speed through a plurality of switching ranges, which as associated with respective discrete progressively increasing motor speeds.
5. A control device as claimed in any one of claims 1 to 4, in which the motor speeds coordinated with the switching positions or switching ranges are adjustable.
6. A control device as claimed in any one of claims 1 to 5, in which the switching positions or switching ranges are adjustable.
7. A control device as claimed in any preceding claim, in which the motor speed is increased continuously in response to an adjustment of the manually operable lever.
8. A control device as claimwed in any one of claims 1 to 7, in which the manually operable lever can assume a position corresponding to a low drum speed without increasing the motor speed.
9. A control device as claimed in any one of claims 1 to 8, in which the switching positions or switching ranges are defined by electrical contacts for initiating the operation of a solenoid operated valve for supplying fluid to a fluid-operable piston and cylinder device for adjusting the control element of the motor.
10. Acontrol device for controlling the means for driving the mixing drum of a vehicle provided with a mixing drum, substantially as hereinbefore described with reference to and as illustrated in the accompanying drawing.
11. Driving means for driving the mixing drum of a mix truck, comprising a variable-displacement hydraulic pump driven by a motor, a hydraulic turbine, a transmission, and a control device as claimed in any one of claims 1 to 10.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3130426 | 1981-07-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2103339A true GB2103339A (en) | 1983-02-16 |
Family
ID=6138301
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08213557A Withdrawn GB2103339A (en) | 1981-07-31 | 1982-05-11 | Control device for controlling the hydraulic means for driving the mixing drum of a mix truck |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2103339A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5175838A (en) * | 1984-10-05 | 1992-12-29 | Hitachi, Ltd. | Memory circuit formed on integrated circuit device and having programmable function |
| US5424981A (en) * | 1984-10-05 | 1995-06-13 | Hitachi, Ltd. | Memory device |
| US5448519A (en) * | 1984-10-05 | 1995-09-05 | Hitachi, Ltd. | Memory device |
| US5923591A (en) * | 1985-09-24 | 1999-07-13 | Hitachi, Ltd. | Memory circuit |
| US6028795A (en) * | 1985-09-24 | 2000-02-22 | Hitachi, Ltd. | One chip semiconductor integrated circuit device having two modes of data write operation and bits setting operation |
| US6286987B1 (en) * | 1999-10-29 | 2001-09-11 | Cummins Engine Company, Inc. | System and method for controlling the speed of an engine providing power to a concrete mixing drum |
| US7467889B2 (en) * | 2006-06-02 | 2008-12-23 | Kayaba Industry Co., Ltd. | Hydraulic driving device for concrete agitating drum responsive to engine speed |
| CN102601863A (en) * | 2012-04-11 | 2012-07-25 | 三一重工股份有限公司 | Mixing drum rotation speed control system, concrete mixing vehicle and concrete mixing pump truck |
| CN101454177B (en) * | 2006-07-25 | 2013-05-08 | 萱场工业株式会社 | Mixer drum driving device |
| US20130111892A1 (en) * | 2011-03-24 | 2013-05-09 | Kayaba Industry Co., Ltd. | Mixer drum driving device |
| US20140198599A1 (en) * | 2011-09-02 | 2014-07-17 | Kayaba Industry Co., Ltd. | Mixer truck |
-
1982
- 1982-05-11 GB GB08213557A patent/GB2103339A/en not_active Withdrawn
Cited By (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5499222A (en) * | 1984-10-05 | 1996-03-12 | Hitachi, Ltd. | Memory device |
| US6359812B2 (en) | 1984-10-05 | 2002-03-19 | Hitachi, Ltd. | Memory device |
| US5448519A (en) * | 1984-10-05 | 1995-09-05 | Hitachi, Ltd. | Memory device |
| US5450342A (en) * | 1984-10-05 | 1995-09-12 | Hitachi, Ltd. | Memory device |
| US5475636A (en) * | 1984-10-05 | 1995-12-12 | Hitachi, Ltd. | Memory device |
| US5493528A (en) * | 1984-10-05 | 1996-02-20 | Hitachi, Ltd. | Memory device |
| US5424981A (en) * | 1984-10-05 | 1995-06-13 | Hitachi, Ltd. | Memory device |
| US5523973A (en) * | 1984-10-05 | 1996-06-04 | Hitachi, Ltd. | Memory device |
| US5781479A (en) * | 1984-10-05 | 1998-07-14 | Hitachi, Ltd. | Memory device |
| US5767864A (en) * | 1984-10-05 | 1998-06-16 | Hitachi, Ltd. | One chip semiconductor integrated circuit device for displaying pixel data on a graphic display |
| US5719809A (en) * | 1984-10-05 | 1998-02-17 | Hitachi, Ltd. | Memory device |
| US5838337A (en) * | 1984-10-05 | 1998-11-17 | Hitachi, Ltd. | Graphic system including a plurality of one chip semiconductor integrated circuit devices for displaying pixel data on a graphic display |
| US5175838A (en) * | 1984-10-05 | 1992-12-29 | Hitachi, Ltd. | Memory circuit formed on integrated circuit device and having programmable function |
| US6643189B2 (en) | 1984-10-05 | 2003-11-04 | Hitachi, Ltd. | Memory device |
| US5923591A (en) * | 1985-09-24 | 1999-07-13 | Hitachi, Ltd. | Memory circuit |
| US6028795A (en) * | 1985-09-24 | 2000-02-22 | Hitachi, Ltd. | One chip semiconductor integrated circuit device having two modes of data write operation and bits setting operation |
| US6286987B1 (en) * | 1999-10-29 | 2001-09-11 | Cummins Engine Company, Inc. | System and method for controlling the speed of an engine providing power to a concrete mixing drum |
| US7467889B2 (en) * | 2006-06-02 | 2008-12-23 | Kayaba Industry Co., Ltd. | Hydraulic driving device for concrete agitating drum responsive to engine speed |
| CN101454177B (en) * | 2006-07-25 | 2013-05-08 | 萱场工业株式会社 | Mixer drum driving device |
| US20130111892A1 (en) * | 2011-03-24 | 2013-05-09 | Kayaba Industry Co., Ltd. | Mixer drum driving device |
| US8616758B2 (en) * | 2011-03-24 | 2013-12-31 | Kayaba Industry Co., Ltd. | Mixer drum driving device |
| US20140198599A1 (en) * | 2011-09-02 | 2014-07-17 | Kayaba Industry Co., Ltd. | Mixer truck |
| US8926164B2 (en) * | 2011-09-02 | 2015-01-06 | Kayaba Industry Co., Ltd. | Mixer truck with drum rotation unevenness determination |
| CN102601863A (en) * | 2012-04-11 | 2012-07-25 | 三一重工股份有限公司 | Mixing drum rotation speed control system, concrete mixing vehicle and concrete mixing pump truck |
| CN102601863B (en) * | 2012-04-11 | 2015-04-08 | 三一汽车制造有限公司 | Mixing drum rotation speed control system, concrete mixing vehicle and concrete mixing pump truck |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |