CN102937074B - Continuous material feeding system and control method and elevating platform fire truck thereof - Google Patents

Continuous material feeding system and control method and elevating platform fire truck thereof Download PDF

Info

Publication number
CN102937074B
CN102937074B CN201210449118.3A CN201210449118A CN102937074B CN 102937074 B CN102937074 B CN 102937074B CN 201210449118 A CN201210449118 A CN 201210449118A CN 102937074 B CN102937074 B CN 102937074B
Authority
CN
China
Prior art keywords
oil
stock
cartridge valve
valve
control
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.)
Active
Application number
CN201210449118.3A
Other languages
Chinese (zh)
Other versions
CN102937074A (en
Inventor
易小刚
杨鑫
陈铭
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sany Automobile Manufacturing Co Ltd
Original Assignee
Sany Automobile Manufacturing Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sany Automobile Manufacturing Co Ltd filed Critical Sany Automobile Manufacturing Co Ltd
Priority to CN201210449118.3A priority Critical patent/CN102937074B/en
Publication of CN102937074A publication Critical patent/CN102937074A/en
Application granted granted Critical
Publication of CN102937074B publication Critical patent/CN102937074B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Abstract

The invention discloses a continuous material feeding system and a control method and an elevating platform fire truck thereof. The control method includes the following steps: A. enabling a piston of a first pump material device to move towards a first limit position of the first pump material device; B. enabling a piston of a second pump material device to move towards the first limit position of the second pump material device before the piston of the first pump material device reaches the first limit position; C. enabling the piston of the first pump material device to move from the first limit position to the second limit position of the first pump material device before the piston of the second pump material device reaches the first limit position of the second pump material device; D. enabling the piston of the second pump material device to move from the first limit position to the second limit position of the second pump material device before the piston of the first pump material device reaches the second limit position of the first pump material device; and E. returning to the step A before the piston of the second pump material device reaches the second limit position of the second pump material device. By means of the system, the method and the truck, driving devices of the two pump material devices can change direction in staggering mode (namely the actions of the two driving devices have certain coincidence area), and flow fluctuation of material outlets is avoided.

Description

Continuous feeding system and controlling method, Elevating platform fire truck
Technical field
The present invention relates to engineering machinery pumping technology field, particularly a kind of continuous feeding system and controlling method, Elevating platform fire truck.
Background technique
Elevating platform fire truck pumping system of the prior art adopts the pumping system of double acting cylinder, specifically, this pumping system comprises water tank, the first pumping water device, the second pumping water device and water outlet, wherein: the first pumping water device and described second pumping water device include pump water vat body and drive unit; The inside of pump water vat body is provided with piston, the internal layout of described pump water vat body is formed the first pump water cavity and the second pump water cavity by described piston, the water sucking mouth of described first pump water cavity and described second pump water cavity is connected to described water tank, and the drain opening of described first pump water cavity and described second pump water cavity is connected to described water outlet; Drive unit can adopt hydraulic control mode, moves in described stock cylinder body for driving described piston.
In the course of the work, by controlling the drive unit of two pumping water devices, the alternately commutation of two pumping water devices can be realized, and then realize the continuous water supply of water outlet, but, when two pumping water devices alternately commutate, produce larger fluctuation by making the flow of water outlet, if flowed fluctuation is comparatively large, the using effect of Elevating platform fire truck will be affected.
Therefore, how realizing Elevating platform fire truck and supply water continuously, steadily, to adapt to on-the-spot needs further, is those skilled in the art's technical problems urgently to be resolved hurrily.
Summary of the invention
In view of this, an object of the present invention is the controlling method proposing a kind of continuous feeding system, effectively to solve the problem producing flowed fluctuation in prior art when pumping.
Specifically, described continuous feeding system comprises accumulator, the first stock device, the second stock device and discharge port; Described first stock device and described second stock device include: stock cylinder body, its inside is provided with piston, the internal layout of described stock cylinder body is formed the first stock chamber and the second stock chamber by described piston, the material sucking port in described first stock chamber and described second stock chamber is connected to described accumulator, and the discharge gate in described first stock chamber and described second stock chamber is connected to described discharge port; Drive unit, moves in described stock cylinder body for driving described piston; Described controlling method comprises the steps: A, drive unit by described first stock device, and the piston of described first stock device is moved towards its first limit position; B, before its first limit position of piston arrives of described first stock device, by the drive unit of described second stock device, the piston of described second stock device is moved towards its first limit position; C, before its first limit position of piston arrives of described second stock device, by the drive unit of described first stock device, the piston of described first stock device is moved towards its second limit position from its first limit position; D, before its second limit position of piston arrives of described first stock device, by the drive unit of described second stock device, the piston of described second stock device is moved towards its second limit position from its first limit position; E, before its second limit position of piston arrives of described second stock device, be back to steps A.
Further, the drive unit of described first stock device and described second stock device includes the first oil cylinder, the second oil cylinder, selector valve group, oil-feed oil circuit and oil return circuit; Described first oil cylinder and described second oil cylinder are arranged at the both sides of described stock cylinder body, and the end of exerting oneself of the piston rod of described first oil cylinder and described second oil cylinder is fixed on the both sides of described piston; The rodless cavity of described first oil cylinder is communicated with in described oil-feed oil circuit and described oil return circuit by described selector valve group selection, and the rodless cavity of described second oil cylinder is communicated with another in described oil-feed oil circuit and described oil return circuit by described selector valve group selection; Described controlling method is specially: A1, selector valve group by described first stock device, make that the rodless cavity of the first oil cylinder of described first stock device communicates with described oil-feed oil circuit, the second oil cylinder rodless cavity communicates with described oil return circuit, thus make the first oil cylinder of described first stock device be in oil-feed state, the piston of described first stock device moves towards its first limit position; B1, before its first limit position of piston arrives of described first stock device, by the selector valve group of described second stock device, make that the rodless cavity of the first oil cylinder of described second stock device communicates with described oil-feed oil circuit, the rodless cavity of the second oil cylinder communicates with described oil return circuit, thus make the first oil cylinder of described second stock device be in oil-feed state, the piston of described second stock device moves towards its first limit position; C1, before its first limit position of piston arrives of described second stock device, by the selector valve group of described first stock device, make that the rodless cavity of the first oil cylinder of described first stock device communicates with described oil return circuit, the rodless cavity of the second oil cylinder communicates with described oil-feed oil circuit, thus make the second oil cylinder of described first stock device be in oil-feed state, the piston of described first stock device moves from its first limit position towards its second limit position; D1, before its second limit position of piston arrives of described first stock device, by the selector valve group of described second stock device, make that the rodless cavity of the first oil cylinder of described second stock device communicates with described oil return circuit, the rodless cavity of the second oil cylinder communicates with described oil-feed oil circuit, thus make the second oil cylinder of described second stock device be in oil-feed state, the piston of described second stock device moves from its first limit position towards its second limit position; E1, before its second limit position of piston arrives of described second stock device, be back to steps A 1.
Further, the drive unit of described first stock device and described second stock device also includes oil circuit control; The selector valve group of arbitrary drive unit comprises position control valve, the first cartridge valve, the second cartridge valve, the 3rd cartridge valve and the 4th cartridge valve; In arbitrary drive unit, the first hydraulic fluid port of described first cartridge valve and described 4th cartridge valve communicates with the rodless cavity of described first oil cylinder and described second oil cylinder respectively, and the second hydraulic fluid port of described first cartridge valve and described 4th cartridge valve leads to described oil return circuit; First hydraulic fluid port of described 3rd cartridge valve and described second cartridge valve communicates with the rodless cavity of described first oil cylinder and described second oil cylinder respectively, and described 3rd cartridge valve is connected with described oil-feed oil circuit with the second hydraulic fluid port of described second cartridge valve; The control port of described first cartridge valve, described second cartridge valve, described 3rd cartridge valve and described 4th cartridge valve is optionally connected to described oil circuit control or fuel tank by described position control valve; Described position control valve at least has two kinds of working staties, under the first working state, the control port of described first cartridge valve and described second cartridge valve communicates with described oil circuit control, the control port of described 3rd cartridge valve and described 4th cartridge valve communicates with fuel tank, under the second working state, the control port of described first cartridge valve and described second cartridge valve communicates with fuel tank, and the control port of described 3rd cartridge valve and described 4th cartridge valve communicates with described oil circuit control; Described controlling method is specially: A2, the position control valve controlling described first stock device are in the first working state, make that the rodless cavity of the first oil cylinder of described first stock device communicates with described oil-feed oil circuit, the second oil cylinder rodless cavity communicates with described oil return circuit, thus make the first oil cylinder of described first stock device be in oil-feed state, the piston of described first stock device moves towards its first limit position; B2, before its first limit position of piston arrives of described first stock device, the position control valve controlling described second stock device is in the first working state, make that the rodless cavity of the first oil cylinder of described second stock device communicates with described oil-feed oil circuit, the rodless cavity of the second oil cylinder communicates with described oil return circuit, thus make the first oil cylinder of described second stock device be in oil-feed state, the piston of described second stock device moves towards its first limit position; C2, before its first limit position of piston arrives of described second stock device, the position control valve controlling described first stock device is in the second working state, make that the rodless cavity of the first oil cylinder of described first stock device communicates with described oil return circuit, the second oil cylinder rodless cavity communicates with described oil-feed oil circuit, thus make the second oil cylinder of described first stock device be in oil-feed state, the piston of described first stock device moves from its first limit position towards its second limit position; D2, before its second limit position of piston arrives of described first stock device, the position control valve controlling described second stock device is in the second working state, make that the rodless cavity of the first oil cylinder of described second stock device communicates with described oil return circuit, the rodless cavity of the second oil cylinder communicates with described oil-feed oil circuit, thus make the second oil cylinder of described second stock device be in oil-feed state, the piston of described second stock device moves from its first limit position towards its second limit position; E2, before its second limit position of piston arrives of described second stock device, be back to steps A 2.
Further, described position control valve is solenoid valve.
Another object of the present invention is to provide a kind of continuous feeding system, the hydraulic solution that this continuous feeding system adopts is simple, aforesaid controlling method can be adopted, thus be convenient to realize automatic control, can ensure that the flow of discharge port remains unchanged, and contribute to improving hydraulic fluid flow rate, realize the quick acting of two stock devices.
Specifically, this continuous feeding system comprises accumulator, the first stock device, the second stock device and discharge port; Described first stock device and described second stock device include: stock cylinder body, its inside is provided with piston, the internal layout of described stock cylinder body is formed the first stock chamber and the second stock chamber by described piston, the material sucking port in described first stock chamber and described second stock chamber is connected to described accumulator, and the discharge gate in described first stock chamber and described second stock chamber is connected to described discharge port; Drive unit, moves in described stock cylinder body for driving described piston; Wherein: the drive unit of described first stock device and described second stock device includes the first oil cylinder, the second oil cylinder, selector valve group, oil-feed oil circuit, oil return circuit and oil circuit control, described selector valve group comprises position control valve, the first cartridge valve, the second cartridge valve, the 3rd cartridge valve and the 4th cartridge valve; In arbitrary stock device, described first oil cylinder and described second oil cylinder are arranged at the both sides of described stock cylinder body, and the end of exerting oneself of the piston rod of described first oil cylinder and described second oil cylinder is fixed on the both sides of described piston; In arbitrary drive unit, the first hydraulic fluid port of described first cartridge valve and described 4th cartridge valve communicates with the rodless cavity of described first oil cylinder and described second oil cylinder respectively, and the second hydraulic fluid port of described first cartridge valve and described 4th cartridge valve leads to described oil return circuit; First hydraulic fluid port of described 3rd cartridge valve and described second cartridge valve communicates with the rodless cavity of described first oil cylinder and described second oil cylinder respectively, and described 3rd cartridge valve is connected with described oil-feed oil circuit with the second hydraulic fluid port of described second cartridge valve; The control port of described first cartridge valve, described second cartridge valve, described 3rd cartridge valve and described 4th cartridge valve is optionally connected to described oil circuit control or fuel tank by described position control valve; Described position control valve at least has two kinds of working staties, under the first working state, the control port of described first cartridge valve and described second cartridge valve communicates with described oil circuit control, the control port of described 3rd cartridge valve and described 4th cartridge valve communicates with fuel tank, under the second working state, the control port of described first cartridge valve and described second cartridge valve communicates with fuel tank, and the control port of described 3rd cartridge valve and described 4th cartridge valve communicates with described oil circuit control.
Further, described position control valve also has the third working state, and under this third working state, the control port of described first cartridge valve, described second cartridge valve, described 3rd cartridge valve and described 4th cartridge valve all communicates with oil circuit control.
Further, described selector valve group also comprises shuttle valve; The oil-inlet end of described oil circuit control is connected to the output terminal of described shuttle valve; An input end of described shuttle valve is connected to described oil-feed oil circuit, the external control oil of another input end.
Further, the oil circuit that described 3rd cartridge valve and the second hydraulic fluid port of described second cartridge valve are connected with described oil-feed oil circuit is provided with one-way valve.
Further, the oil circuit that described 3rd cartridge valve and the second hydraulic fluid port of described second cartridge valve are connected with described oil-feed oil circuit is provided with accumulator.
The third object of the present invention is to provide a kind of Elevating platform fire truck, and described Elevating platform fire truck is provided with the continuous feeding system described in above-mentioned any one, and described continuous feeding system is used for realizing continuous water supply.
Adopt the controlling method of a kind of continuous feeding system provided by the invention, in use, first can control the drive unit action of the first stock device, make the first stock device to discharge port continuous feeding, then before the first stock device terminates feed, control the drive unit action of the second stock device, make the second stock device to discharge port continuous feeding, again before the second stock device terminates feed, control the drive unit action of the first stock device, make the first stock device to discharge port continuous feeding, so move in circles, namely to interlock action by controlling the drive unit of these two stock devices, the continuous of discharge port can be realized, steady feed, compared with prior art, due to the staggered commutation (namely the action of two drive units has certain overlapping region) of the drive unit of two stock devices can be made, both continuous feeding was achieved, and thoroughly solve the phenomenon that discharge port produces flowed fluctuation, for the stream material such as water, due in pumping procedure, water is not easy to suck air, and decrement is less, there is not the phenomenon of idle stroke, when therefore the present invention is used for realizing continuous water supply, and Be very effective, and easily air is sucked when pumping for other and for the larger stream material of decrement, the size by adjusting above-mentioned overlapping region realizes continuous and stable feed.In addition, in one more specifically scheme, the drive unit of two stock devices all adopts hydraulic way to realize, namely by the connected state of selector valve group oil circuit control and the first oil cylinder and the second oil cylinder, the staggered commutation of two stock cylinder bodies can be realized, this mode controls simply, and the load that can realize discharge port remains unchanged.
A kind of continuous feeding system provided by the invention is convenient to realize automatic control, and its selector valve group adopts position control valve and multiple cartridge valve to realize, and contributes to improving hydraulic fluid flow rate, thus realizes the quick acting of the first oil cylinder and the second oil cylinder.
A kind of Elevating platform fire truck provided by the invention is provided with above-mentioned continuous feeding system, and because above-mentioned continuous feeding system has above-mentioned technique effect, therefore, this Elevating platform fire truck also has corresponding technique effect.
Accompanying drawing explanation
The accompanying drawing forming a part of the present invention is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
The principle schematic of a kind of continuous feeding system that Fig. 1 provides for the embodiment of the present invention;
Fig. 2 is the hydraulic fluid port sign picture of each cartridge valve in Fig. 1;
In a kind of controlling method that Fig. 3 provides for the embodiment of the present invention, schematic diagram is controlled to the state of relevant electromagnetic coil.
Embodiment
To it should be pointed out that in this part to the description of concrete structure and description order it is only explanation to specific embodiment, should not be considered as there is any restriction to protection scope of the present invention.In addition, when not conflicting, the embodiment in this part and the feature in embodiment can combine mutually.
Please refer to Fig. 1, and shown in composition graphs 2, below with reference to the accompanying drawings the embodiment of the present invention is described in further detail.In addition, in the present embodiment, be used for realizing continuous water supply explanation for example with this continuous feeding system.
As shown in Figure 1, the continuous feeding system of this embodiment comprises accumulator, discharge port and the first stock device of being arranged between this accumulator and this discharge port and the second stock device.
Specifically, in the present embodiment, accumulator is water tank, and discharge port is water outlet.
First stock device mainly comprises stock cylinder body 7 and drive unit, wherein: in stock cylinder body 7, be provided with piston, this piston is gap-forming first stock chamber and the second stock chamber in stock cylinder body 7, the material sucking port in the first stock chamber is connected to accumulator (i.e. water tank) by one-way valve 71, the discharge gate in the first stock chamber is connected to discharge port (i.e. water outlet) by one-way valve 73, the material sucking port in the second stock chamber is connected to accumulator by one-way valve 72, and the discharge gate in the second stock chamber is connected to discharge port by one-way valve 74; Drive unit moves in the first stock chamber and the second stock chamber for driving this piston, and then realizes the first stock chamber suction, the second stock chamber discharge, or realizes the first stock chamber discharge, the second stock chamber suction.
The drive unit of the first stock device comprises the first oil cylinder C1, the second oil cylinder C2, selector valve group, oil-feed oil circuit 01 and oil return circuit 02, first oil cylinder C1 and the second oil cylinder C2 is arranged at the both sides of stock cylinder body 7, and the end of exerting oneself of the piston rod of the first oil cylinder C1 and the second oil cylinder C2 slides through stock cylinder body 7 respectively to be fixed on the both sides of piston, the rodless cavity of the first oil cylinder C1 is communicated with in oil-feed oil circuit 01 and oil return circuit 02 by selector valve group selection, the rodless cavity of the second oil cylinder 02 is communicated with another in oil-feed oil circuit 01 and oil return circuit 02 by selector valve group selection, namely oil-feed oil circuit 01 can be made to the rodless cavity fuel feeding of the first oil cylinder C1 by selector valve group, and make oil return circuit 02 provide drainback passage for the rodless cavity of the second oil cylinder C2, and then realize the first stock chamber suction (water), second stock chamber discharge (water), or make oil-feed oil circuit 01 to the rodless cavity fuel feeding of the second oil cylinder C2, and make oil return circuit 02 provide drainback passage for the rodless cavity of the first oil cylinder C1, and then realize the first stock chamber discharge, second stock chamber suction, that is the oil inlet and oil return state of rodless cavity of the first oil cylinder C1 and the second oil cylinder C2 can be controlled by selector valve group, thus realize the first pumping installations water is pumped to water outlet from water tank.
As a kind of embodiment, selector valve group comprises position control valve 5, first cartridge valve e1, the second cartridge valve e2, the 3rd cartridge valve e3 and the 4th cartridge valve e4, wherein: shown in composition graphs 2, the first hydraulic fluid port A of the first cartridge valve e1 and the 4th cartridge valve e4 communicates with the rodless cavity of the first oil cylinder C1 and the second oil cylinder C2 respectively, and the second hydraulic fluid port B of the first cartridge valve e1 and the 4th cartridge valve e4 leads to oil return circuit 02, the first hydraulic fluid port A of the 3rd cartridge valve e3 and the second cartridge valve e2 communicates with the rodless cavity of the first oil cylinder C1 and the second oil cylinder C2 respectively, and the 3rd cartridge valve e3 is connected with oil-feed oil circuit 02 with the second hydraulic fluid port B of the second cartridge valve e2, the control port X of the first cartridge valve e1, the second cartridge valve e2, the 3rd cartridge valve e3 and the 4th cartridge valve e4 is optionally connected to oil circuit control 03 or fuel tank by position control valve 5, position control valve 5 for Median Function be the three-position four-way valve of P type, (left position is namely worked in) under the first working state, the control port X of the first cartridge valve e1 and the second cartridge valve e2 communicates with oil circuit control 03, the control port X of the 3rd cartridge valve e3 and the 4th cartridge valve e4 communicates with fuel tank, (right position is namely worked in) under the second working state, the control port X of the first cartridge valve e1 and the second cartridge valve e2 communicates with fuel tank, the control port X of described 3rd cartridge valve e3 and described 4th cartridge valve e4 communicates with described oil circuit control 03, (namely meta is worked in) under the third working state, first cartridge valve e1, second cartridge valve e2, the control port X of the 3rd cartridge valve e3 and the 4th cartridge valve e4 communicates with oil circuit control 03.
In the present embodiment, the composition structure of the second stock device is identical with the first stock device, accordingly, second stock device specifically comprises stock cylinder body 8, first oil cylinder C3, the second oil cylinder C4, oil-feed oil circuit 01, oil return circuit 02, position control valve 6, first cartridge valve e5, the second cartridge valve e6, the 3rd cartridge valve e7 and the 4th cartridge valve e8 etc., the set-up mode of above-mentioned each constituent element, see describing above, does not hereby repeat.
A kind of controlling method for above-mentioned continuous feeding system that the embodiment of the present invention provides is provided below in conjunction with concrete scene, and the working principle of incidentally above-described embodiment, in this scenario, the position control valve 5 and 6 of setting two stock devices is solenoid valve, further, position control valve 5 has the first electromagnetic coil DT2 and the second electromagnetic coil DT3, when DT2 obtains electric, during DT3 dead electricity, (left position is namely in) under position control valve 5 is in the first working state, when DT2 dead electricity, when DT3 obtains electric, (right position is namely in) under position control valve 5 is in the second working state, work as DT2, during the equal dead electricity of DT3, (namely meta is in) under position control valve 5 is in the third working state, position control valve 6 has the 3rd electromagnetic coil DT5 and the 4th electromagnetic coil DT4, when DT5 obtains electric, DT4 dead electricity, (right position is namely in) under position control valve 6 is in the first working state, when DT5 dead electricity, DT4 obtain electric, (left position is namely in) under position control valve 6 is in the second working state, when the equal dead electricity of DT4, DT5, under position control valve 6 is in the third working state, (be namely in meta).
Shown in composition graphs 3, being described as follows of this controlling method: in the course of the work, in an initial condition, under DT2, DT3, DT4 and DT5 are all in power failure state, position control valve 5 and 6 is in meta, the control port X of cartridge valve e1 ~ e7 all has control oil (from oil circuit control 03) to flow into, cartridge valve e1 ~ e7 is all in closed condition, the rodless cavity of oil cylinder C1 ~ C4 does not all obtain pressure oil from oil-feed oil circuit 01, also all not to oil return circuit 02 oil return, the piston in stock cylinder body 7 and 8 mediates, if desired water outlet continuous water supply is realized, first can obtain electric a period of time by control DT3, within this time, position control valve 5 is in right position, cartridge valve e1 and e2 is in open mode, cartridge valve e3 and e4 is in closed condition, oil-feed oil circuit 01 is by the second hydraulic fluid port B by cartridge valve e2, first hydraulic fluid port A is to the rodless cavity fuel feeding of oil cylinder C2, and the rodless cavity of oil cylinder C1 is by the first hydraulic fluid port A by cartridge valve e1, second hydraulic fluid port B is to oil return circuit 02 oil return, namely the piston rod of oil cylinder C1 and C2 is moved to the left (left side is entered), piston in stock cylinder body 7 moves towards its first limit position left, the first stock chamber draining in stock cylinder body 7, second stock chamber water suction, water outlet is outwards supplied water, then when DT3 exit before electricity condition, namely oil cylinder C1 and an oil cylinder C2 left side carry out journey close to an end time, control DT5 obtains electric a period of time, within this time, position control valve 6 is in right position, cartridge valve e5 and e6 is in closed condition, cartridge valve e7 and e8 is in open mode, oil-feed oil circuit 01 is by the second hydraulic fluid port B by cartridge valve e7, first hydraulic fluid port A is to the rodless cavity fuel feeding of oil cylinder C4, and the rodless cavity of oil cylinder C3 is by the first hydraulic fluid port A by cartridge valve e8, second hydraulic fluid port B is to oil return circuit 02 oil return, namely the piston rod of oil cylinder C3 and C4 is moved to the left (left side is entered), piston in stock cylinder body 8 moves towards its first limit position left, first stock chamber draining of stock cylinder body 8, second stock chamber water suction, water outlet is made to continue outwards to supply water, because the electric time that obtains of DT3 and DT5 has overlapping region (slightly overlapping), the water of water outlet can not stop, then, when DT5 exit before electricity condition, namely oil cylinder C3 and a C4 left side carry out journey close to an end time, control DT2 obtains electric a period of time, within this time, position control valve 5 is in left position, cartridge valve e1 and e2 is in closed condition, cartridge valve e3 and e4 is in open mode, oil-feed oil circuit 01 is by the second hydraulic fluid port B by cartridge valve e3, first hydraulic fluid port A is to the rodless cavity fuel feeding of oil cylinder C1, and the rodless cavity of oil cylinder C2 is by the first hydraulic fluid port A by cartridge valve e4, second hydraulic fluid port B is to oil return circuit 02 oil return, namely the piston rod of oil cylinder C1 and C2 moves right (right side is entered), piston in stock cylinder body 7 moves towards its second limit position to the right from its first limit position, first stock chamber water suction of stock cylinder body 7, second stock chamber draining, water outlet is made to continue outwards to supply water, because the electric time that obtains of DT5 and DT2 has overlapping region (slightly overlapping), the water of water outlet can not stop, then, when DT2 exit before electricity condition, namely oil cylinder C1 and the C2 right side carry out journey close to an end time, control DT4 obtains electric a period of time, within this time, position control valve 6 is in left position, cartridge valve e5 and e6 is in open mode, cartridge valve e7 and e8 is in closed condition, oil-feed oil circuit 01 is by the second hydraulic fluid port B by cartridge valve e6, first hydraulic fluid port A is to the rodless cavity fuel feeding of oil cylinder C3, and the rodless cavity of oil cylinder C4 is by the first hydraulic fluid port A by cartridge valve e5, second hydraulic fluid port B is to oil return circuit 02 oil return, namely the piston rod of oil cylinder C3 and C4 moves right (right side is entered), piston in stock cylinder body 8 moves towards its second limit position to the right from its first limit position, first stock chamber water suction of stock cylinder body 8, second stock chamber draining, water outlet is made to continue outwards to supply water, because the electric time that obtains of DT2 and DT4 has overlapping region (slightly overlapping), the water of water outlet can not stop, and can not flowed fluctuation be produced, move in circles according to above-mentioned steps, the staggered commutation of the first stock device and the second stock device can be realized, and then realize water outlet and outwards supply water continuously, steadily for a long time.It should be noted that, in order to realize supplying water continuously, steadily, in above-mentioned controlling method, each electromagnetic coil in a cycle period electric order (adjacent two electric time have overlapping region) can also be DT2, DT4, DT3, DT5, or DT2, DT5, DT3, DT4, or DT3, DT4, DT2, DT5, as long as the staggered commutation that can realize position control valve 5 and 6, and then realize the first stock device and the second the staggered of stock device commutates.
In addition, in the continuous feeding system of above-described embodiment, the structure of each oil cylinder and stroke are preferably identical, correspondingly, in above-mentioned controlling method, can control DT3 ~ DT5 the electric time identical.In addition, in above-mentioned continuous feeding system, because oil cylinder C1/C2, C3/C4 all obtain pressure oil by oil-feed oil circuit 01, the pressure oil of oil-feed oil circuit 01 can distribute in the hydraulic unit of two, left and right, therefore, no matter position control valve 5 and 6 makes individually action or the action simultaneously of two stock devices, all can ensure that the water-outlet quantity of water outlet remains unchanged.In addition, in order to realize better entering on a left side or the right side to carry out when journey closes to an end control DT3 ~ DT5 by electricity condition switch to power failure state, pressure transducer SP1, SP2, SP3 and SP4 can be set buffer cavity in the rodless cavity of oil cylinder C1, C2, C3 and C4 respectively, due to piston rod left or move right be about to reach the limit of position time, the pressure of the buffer cavity in corresponding rodless cavity will change comparatively fast (sudden change), and pressure transducer can this change of perception, and send signal, as the foundation that corresponding electromagnetic coil gain and loss TURP changes; In specific implementation process, it can be the corresponding controller of above-mentioned continuous water supply system layout, such as, this controller can by PLC(Programmable Logic Controller, programmable logic controller (PLC)) etc. build, signal is uploaded to PLC by each pressure transducer, when needing the state switching electromagnetic coil, drives electromagnetic coil by PLC by relay or special circuit.Each pressure transducer above-mentioned can use proximity switch (detecting oil cylinder piston whether to be about to arrive extreme limit of travel) to replace.The state switching of each electromagnetic coil also can realize by liquid controlled reversing mode (as pressure difference valve).
It should be noted that, in the specific implementation process of above-mentioned continuous feeding system, can by oil pump 1 for oil-feed oil circuit 01 provides pressure oil, specifically, the filler opening of oil pump 1 is connected to fuel tank, oil outlet is connected to the oil-inlet end of oil-feed oil circuit 01 by one-way valve 2, one-way valve 2 can prevent pressure oil from flowing backward in oil pump 1, in order to ensure the safe operation of whole hydraulic system, relief valve 10 can also be set on oil-feed oil circuit 01, in the process realizing continuous feeding, the electromagnetic coil DT1 of relief valve 10 is in obtain electricity condition always, in addition, in specific implementation process, above-mentioned continuous feeding system embodiment and phase strain type thereof can also do following optimization alternatively:
1, in order to make two pumping installations in left and right relatively independent, the oil circuit that can be connected with oil-feed oil circuit 01 at cartridge valve e2, e3 arranges one-way valve 3, and the oil circuit to be connected with oil-feed oil circuit 01 at cartridge valve e6, e7 arranges one-way valve 4, one-way valve 3 and 4 all can adopt cartridge valve form, to improve hydraulic fluid flow rate.
The oil circuit that 2, can be connected with oil-feed oil circuit 01 at cartridge valve e2, e3 arranges accumulator 11 and unloading valve 12, and the oil circuit to be connected with oil-feed oil circuit 01 at cartridge valve e6, e7 arranges accumulator 13 and unloading valve 12, to realize after a group oil cylinder commutation, the pressure oil fast repairing of oil-feed oil circuit 01 is charged in another group oil cylinder, and namely accumulator can play pressurize and the effect shortening turn around time.
3, selector valve group can also comprise shuttle valve 9, and the oil-inlet end of oil circuit control 03 is connected to the output terminal of shuttle valve 9, and an input end of shuttle valve 9 is connected to oil-feed oil circuit 01, the external control oil of another input end; Or the direct external control oil of the input end of oil circuit control 03.
4, in order to eliminate the impurity in water, the normal use of the stock cylinder body of two the stock devices in protection left and right etc., can arrange filter 75 on the first stock chamber and the pipeline between the second stock chamber and water tank.
5, cartridge valve e1 ~ e8, position control valve 5 and 6, oil-feed oil circuit 01, oil-feed oil circuit 02, shuttle valve 9, one-way valve 3 and 4, relief valve 10 can be integrated into (as shown in the dotted line frame in Fig. 1) in same valve block, this valve block forms the oil-collecting holes such as T, P1, A1, A2, A3, A4, A5, A6, A7 and M1, wherein, M1 mouth is pressure measurement interface, can be used for measuring the pressure on oil-feed oil circuit 01, the connection of other oil-collecting holes can see shown in Fig. 1.
It should be noted that, in the preferred version of above-mentioned continuous feeding system embodiment, two the selector valve groups in left and right all adopt position control valve and the combined mode of multiple cartridge valve, wherein, cartridge valve is adopted to contribute to improving hydraulic fluid flow rate, to realize the quick acting of oil cylinder, but those skilled in the art are to be understood that, in other embodiments, also the other forms of selector valve group with above-mentioned corresponding function can be adopted as required, as long as the staggered commutation of left and right two group oil cylinders can be realized and then realize continuously, steadily to supply water, correspondingly, controlling method for this continuous feeding system comprises the steps: one, by the selector valve group of the first stock device, the rodless cavity of the first oil cylinder of the first stock device is communicated with oil-feed oil circuit, second oil cylinder rodless cavity communicates with oil return circuit, thus make the first oil cylinder of the first stock device be in oil-feed state, the piston of the first stock device moves towards its first limit position, two, before its first limit position of piston arrives of the first stock device, by the selector valve group of the second stock device, make that the rodless cavity of the first oil cylinder of the second stock device communicates with oil-feed oil circuit, the rodless cavity of the second oil cylinder communicates with oil return circuit, thus make the first oil cylinder of the second stock device be in oil-feed state, the piston of the second stock device moves towards its first limit position, three, before its first limit position of piston arrives of the second stock device, by the selector valve group of the first stock device, make that the rodless cavity of the first oil cylinder of the first stock device communicates with oil return circuit, the rodless cavity of the second oil cylinder communicates with described oil-feed oil circuit, thus make the second oil cylinder of the first stock device be in oil-feed state, the piston of the first stock device moves from its first limit position towards its second limit position, four, before its second limit position of piston arrives of the first stock device, by the selector valve group of the second stock device, make that the rodless cavity of the first oil cylinder of the second stock device communicates with oil return circuit, the rodless cavity of the second oil cylinder communicates with oil-feed oil circuit, thus make the second oil cylinder of the second stock device be in oil-feed state, the piston of the second stock device moves from its first limit position towards its second limit position, five, before its second limit position of piston arrives of the second stock device, step one is back to.In addition, the drive unit of two pumping installations in left and right all adopts hydraulic solution to realize, in other embodiments, other modes can also be adopted to realize the driving of stock cylinder body inner carrier, as long as piston can be made to move left and right and then realize stock chamber, left and right suction on one side discharge on one side, correspondingly, the controlling method for this continuous feeding system comprises the steps: 1, by the drive unit of described first stock device, the piston of described first stock device is moved towards its first limit position; 2, before its first limit position of piston arrives of described first stock device, by the drive unit of described second stock device, the piston of described second stock device is moved towards its first limit position; 3, before its first limit position of piston arrives of described second stock device, by the drive unit of described first stock device, the piston of described first stock device is moved towards its second limit position from its first limit position; 4, before its second limit position of piston arrives of described first stock device, by the drive unit of described second stock device, the piston of described second stock device is moved towards its second limit position from its first limit position; 5, before its second limit position of piston arrives of described second stock device, step 1 is back to.
It should be noted that, above-mentioned continuous feeding system embodiment and various modification thereof realize continuous water supply explanation for example to be applied to, in other embodiments, above-mentioned continuous feeding system embodiment and various modification thereof also can be applied to and realize the without interruption of other stream material, and other streams expect such as hydraulic pressure wet goods.
A kind of controlling method for continuous feeding system that the embodiment of the present invention provides, compared with prior art, there is certain overlapping region due to the drive unit of two stock devices can be made when staggered action, not only achieve continuous feeding, and effectively prevent discharge port generation flowed fluctuation, namely the flow of discharge port remains unchanged; For the stream material such as water, due in pumping procedure, water is not easy to suck air, and decrement is less, there is not the phenomenon of idle stroke, when therefore the present invention is for realizing continuously, steadily supplying water, and Be very effective; And easily air is sucked when pumping for other and for the larger stream material of decrement, realizes continuous feeding by the size adjusting above-mentioned overlapping region.
A kind of continuous feeding system that the embodiment of the present invention provides is convenient to realize automatic control, and its selector valve group adopts position control valve and multiple cartridge valve to realize, and contributes to improving hydraulic fluid flow rate, thus realizes the quick acting of the first oil cylinder and the second oil cylinder.
The embodiment of the present invention additionally provides a kind of Elevating platform fire truck, and this Elevating platform fire truck is provided with above-mentioned continuous water supply system, and this continuous feeding system is used for realizing continuous water supply.Because above-mentioned continuous water supply system has above-mentioned technique effect, therefore, the Elevating platform fire truck being provided with this continuous water supply system also should possess corresponding technique effect, the specific implementation process of its appropriate section is similar to the above embodiments, the specific implementation process of other parts, see prior art, does not hereby repeat.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (8)

1. a controlling method for continuous feeding system, is characterized in that, described continuous feeding system comprises accumulator, the first stock device, the second stock device and discharge port; Described first stock device and described second stock device include: stock cylinder body, its inside is provided with piston, the internal layout of described stock cylinder body is formed the first stock chamber and the second stock chamber by described piston, the material sucking port in described first stock chamber and described second stock chamber is connected to described accumulator, and the discharge gate in described first stock chamber and described second stock chamber is connected to described discharge port; Drive unit, moves in described stock cylinder body for driving described piston;
The drive unit of described first stock device and described second stock device includes the first oil cylinder, the second oil cylinder, selector valve group, oil-feed oil circuit and oil return circuit; Described first oil cylinder and described second oil cylinder are arranged at the both sides of described stock cylinder body, and the end of exerting oneself of the piston rod of described first oil cylinder and described second oil cylinder is fixed on the both sides of described piston; The rodless cavity of described first oil cylinder is communicated with in described oil-feed oil circuit and described oil return circuit by described selector valve group selection, and the rodless cavity of described second oil cylinder is communicated with another in described oil-feed oil circuit and described oil return circuit by described selector valve group selection;
The drive unit of described first stock device and described second stock device also includes oil circuit control; The selector valve group of arbitrary drive unit comprises position control valve, the first cartridge valve, the second cartridge valve, the 3rd cartridge valve and the 4th cartridge valve; In arbitrary drive unit, first hydraulic fluid port of described first cartridge valve communicates with the rodless cavity of described first oil cylinder, first hydraulic fluid port of described 4th cartridge valve communicates with the rodless cavity of described second oil cylinder, and the second hydraulic fluid port of described first cartridge valve and described 4th cartridge valve leads to described oil return circuit; First hydraulic fluid port of described 3rd cartridge valve communicates with the rodless cavity of described first oil cylinder, first hydraulic fluid port of described second cartridge valve communicates with the rodless cavity of described second oil cylinder, and described 3rd cartridge valve is connected with described oil-feed oil circuit with the second hydraulic fluid port of described second cartridge valve; The control port of described first cartridge valve, described second cartridge valve, described 3rd cartridge valve and described 4th cartridge valve is optionally connected to described oil circuit control or fuel tank by described position control valve; Described position control valve at least has two kinds of working staties, under the first working state, the control port of described first cartridge valve and described second cartridge valve communicates with described oil circuit control, the control port of described 3rd cartridge valve and described 4th cartridge valve communicates with fuel tank, under the second working state, the control port of described first cartridge valve and described second cartridge valve communicates with fuel tank, and the control port of described 3rd cartridge valve and described 4th cartridge valve communicates with described oil circuit control;
Described controlling method comprises the steps:
A2, the position control valve controlling described first stock device are in the first working state, make that the rodless cavity of the first oil cylinder of described first stock device communicates with described oil-feed oil circuit, the rodless cavity of the second oil cylinder communicates with described oil return circuit, thus make the first oil cylinder of described first stock device be in oil-feed state, the piston of described first stock device moves towards its first limit position;
B2, before its first limit position of piston arrives of described first stock device, the position control valve controlling described second stock device is in the first working state, make that the rodless cavity of the first oil cylinder of described second stock device communicates with described oil-feed oil circuit, the rodless cavity of the second oil cylinder communicates with described oil return circuit, thus make the first oil cylinder of described second stock device be in oil-feed state, the piston of described second stock device moves towards its first limit position;
C2, before its first limit position of piston arrives of described second stock device, the position control valve controlling described first stock device is in the second working state, make that the rodless cavity of the first oil cylinder of described first stock device communicates with described oil return circuit, the rodless cavity of the second oil cylinder communicates with described oil-feed oil circuit, thus make the second oil cylinder of described first stock device be in oil-feed state, the piston of described first stock device moves from its first limit position towards its second limit position;
D2, before its second limit position of piston arrives of described first stock device, the position control valve controlling described second stock device is in the second working state, make that the rodless cavity of the first oil cylinder of described second stock device communicates with described oil return circuit, the rodless cavity of the second oil cylinder communicates with described oil-feed oil circuit, thus make the second oil cylinder of described second stock device be in oil-feed state, the piston of described second stock device moves from its first limit position towards its second limit position;
E2, before its second limit position of piston arrives of described second stock device, be back to steps A 2.
2. controlling method as claimed in claim 1, is characterized in that: described position control valve is solenoid valve.
3. a continuous feeding system, comprises accumulator, the first stock device, the second stock device and discharge port; Described first stock device and described second stock device include: stock cylinder body, its inside is provided with piston, the internal layout of described stock cylinder body is formed the first stock chamber and the second stock chamber by described piston, the material sucking port in described first stock chamber and described second stock chamber is connected to described accumulator, and the discharge gate in described first stock chamber and described second stock chamber is connected to described discharge port; Drive unit, moves in described stock cylinder body for driving described piston;
It is characterized in that: the drive unit of described first stock device and described second stock device includes the first oil cylinder, the second oil cylinder, selector valve group, oil-feed oil circuit, oil return circuit and oil circuit control, described selector valve group comprises position control valve, the first cartridge valve, the second cartridge valve, the 3rd cartridge valve and the 4th cartridge valve; In arbitrary stock device, described first oil cylinder and described second oil cylinder are arranged at the both sides of described stock cylinder body, and the end of exerting oneself of the piston rod of described first oil cylinder and described second oil cylinder is fixed on the both sides of described piston; In arbitrary drive unit, first hydraulic fluid port of described first cartridge valve communicates with the rodless cavity of described first oil cylinder, first hydraulic fluid port of described 4th cartridge valve communicates with the rodless cavity of described second oil cylinder, and the second hydraulic fluid port of described first cartridge valve and described 4th cartridge valve leads to described oil return circuit; First hydraulic fluid port of described 3rd cartridge valve communicates with the rodless cavity of described first oil cylinder, first hydraulic fluid port of described second cartridge valve communicates with the rodless cavity of described second oil cylinder, and described 3rd cartridge valve is connected with described oil-feed oil circuit with the second hydraulic fluid port of described second cartridge valve; The control port of described first cartridge valve, described second cartridge valve, described 3rd cartridge valve and described 4th cartridge valve is optionally connected to described oil circuit control or fuel tank by described position control valve; Described position control valve at least has two kinds of working staties, under the first working state, the control port of described first cartridge valve and described second cartridge valve communicates with described oil circuit control, the control port of described 3rd cartridge valve and described 4th cartridge valve communicates with fuel tank, under the second working state, the control port of described first cartridge valve and described second cartridge valve communicates with fuel tank, and the control port of described 3rd cartridge valve and described 4th cartridge valve communicates with described oil circuit control.
4. continuous feeding system as claimed in claim 3, it is characterized in that: described position control valve also has the third working state, under this third working state, the control port of described first cartridge valve, described second cartridge valve, described 3rd cartridge valve and described 4th cartridge valve all communicates with oil circuit control.
5. the continuous feeding system as described in claim 3 or 4, is characterized in that: described selector valve group also comprises shuttle valve; The oil-inlet end of described oil circuit control is connected to the output terminal of described shuttle valve; An input end of described shuttle valve is connected to described oil-feed oil circuit, the external control oil of another input end.
6. the continuous feeding system as described in claim 3 or 4, is characterized in that: the oil circuit that described 3rd cartridge valve and the second hydraulic fluid port of described second cartridge valve are connected with described oil-feed oil circuit is provided with one-way valve.
7. the continuous feeding system as described in claim 3 or 4, is characterized in that: the oil circuit that described 3rd cartridge valve and the second hydraulic fluid port of described second cartridge valve are connected with described oil-feed oil circuit is provided with accumulator.
8. an Elevating platform fire truck, is characterized in that, described Elevating platform fire truck is provided with the continuous feeding system described in any one of claim 3 to 7, and described continuous feeding system is used for realizing continuous water supply.
CN201210449118.3A 2012-11-12 2012-11-12 Continuous material feeding system and control method and elevating platform fire truck thereof Active CN102937074B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201210449118.3A CN102937074B (en) 2012-11-12 2012-11-12 Continuous material feeding system and control method and elevating platform fire truck thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201210449118.3A CN102937074B (en) 2012-11-12 2012-11-12 Continuous material feeding system and control method and elevating platform fire truck thereof

Publications (2)

Publication Number Publication Date
CN102937074A CN102937074A (en) 2013-02-20
CN102937074B true CN102937074B (en) 2015-06-10

Family

ID=47695988

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201210449118.3A Active CN102937074B (en) 2012-11-12 2012-11-12 Continuous material feeding system and control method and elevating platform fire truck thereof

Country Status (1)

Country Link
CN (1) CN102937074B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107387360B (en) * 2017-06-15 2020-12-22 三一汽车制造有限公司 Plunger pump water supply system and control method thereof
CN111959604A (en) * 2020-07-27 2020-11-20 农业农村部南京农业机械化研究所 Multi-mode steering system

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3707881A (en) * 1970-03-12 1973-01-02 Uhde Gmbh Friedrich Control system for hydraulic fluid-feed mechanism
FR2689421A1 (en) * 1992-04-01 1993-10-08 Lebruno Roland High pressure pump for pulverising paint for road marking - uses three cylinders with centre piston hydraulically driven to operate other two so they are alternately in compression.
JPH09126117A (en) * 1995-10-30 1997-05-13 Ishikawajima Constr Mach Co Reciproctable fluid pump
WO2000077397A1 (en) * 1999-06-15 2000-12-21 Bernard Marinzet Piston pump, method and installation for filtering water
JP2005098230A (en) * 2003-09-25 2005-04-14 Ishikawajima Constr Mach Co Stroke correction device for double piston pump
CN2744855Y (en) * 2004-11-02 2005-12-07 刘可刚 High speed pumping device for concrete
CN201730780U (en) * 2010-06-18 2011-02-02 宝鸡石油机械有限责任公司 Hydraulically driven difunctional multi-cylinder slurry pump
CN102536725A (en) * 2011-11-07 2012-07-04 北京市三一重机有限公司 Pumping system, control method thereof, and fire fighting equipment

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3707881A (en) * 1970-03-12 1973-01-02 Uhde Gmbh Friedrich Control system for hydraulic fluid-feed mechanism
FR2689421A1 (en) * 1992-04-01 1993-10-08 Lebruno Roland High pressure pump for pulverising paint for road marking - uses three cylinders with centre piston hydraulically driven to operate other two so they are alternately in compression.
JPH09126117A (en) * 1995-10-30 1997-05-13 Ishikawajima Constr Mach Co Reciproctable fluid pump
WO2000077397A1 (en) * 1999-06-15 2000-12-21 Bernard Marinzet Piston pump, method and installation for filtering water
JP2005098230A (en) * 2003-09-25 2005-04-14 Ishikawajima Constr Mach Co Stroke correction device for double piston pump
CN2744855Y (en) * 2004-11-02 2005-12-07 刘可刚 High speed pumping device for concrete
CN201730780U (en) * 2010-06-18 2011-02-02 宝鸡石油机械有限责任公司 Hydraulically driven difunctional multi-cylinder slurry pump
CN102536725A (en) * 2011-11-07 2012-07-04 北京市三一重机有限公司 Pumping system, control method thereof, and fire fighting equipment

Also Published As

Publication number Publication date
CN102937074A (en) 2013-02-20

Similar Documents

Publication Publication Date Title
CN100424361C (en) Closed electrohydraulic controlling system
CN201661532U (en) Hydraulic pumping system of concrete pump
CN105782147A (en) Double-acting hydraulic control system of supercharging device
WO2012034451A1 (en) Piston lubrication system for concrete cylinder
CN102937074B (en) Continuous material feeding system and control method and elevating platform fire truck thereof
CN106801691B (en) Concrete pump and its hydraulic system, control method
CN102734263A (en) Engineering machine and pumping mechanism thereof as well as pumping hydraulic oil supply system
CN103062140A (en) Hydraulic device on basis of confluence control mode
CN103511364A (en) Hydraulic pressurizing system
CN102734241B (en) Opened and closed hydraulic system and engineering machinery
CN2647808Y (en) Concrete hauling pump
CN104214142A (en) Manifold truck and hydraulic control system thereof
CN202867371U (en) Cushion valve
CN201760386U (en) Automatic glue amount control system for automatic hollow glass glue sealing line
CN206953495U (en) A kind of high response open mold hydraulic system
CN201470573U (en) Material supplying system of glue injection equipment
CN103244499A (en) Walking double-pump confluence system
CN206449034U (en) A kind of hydraulic system being applied in automatic hydraulic blanking iron cutting machine
CN204284037U (en) A kind of hydraulic system, pumping system and concrete pumping equipment
CN205639153U (en) Supercharging device , hydraulic system and mechanical equipment
CN104675775B (en) A kind of pump truck hydraulic system and pump truck
AU2012391449B2 (en) Reciprocating low-speed heavy-load hydraulic pump with variable action area
CN101382232A (en) Positive displacement single-valve lubrication apparatus
CN203770276U (en) Double-way oil supply priority valve
CN203130638U (en) Hydraulic device based on confluence control mode

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
ASS Succession or assignment of patent right

Owner name: SANY AUTOMOBILE MANUFACTURING CO., LTD.

Free format text: FORMER OWNER: SANYI HEAVY INDUSTRY CO LTD

Effective date: 20130502

C41 Transfer of patent application or patent right or utility model
TA01 Transfer of patent application right

Effective date of registration: 20130502

Address after: 410100 Changsha economic and Technological Development Zone, Hunan City, the 31 industrial city

Applicant after: SANY Automobile Manufacturing Co., Ltd.

Address before: 410100 Changsha economic and Technological Development Zone, Hunan City, the 31 industrial city

Applicant before: Sanyi Heavy Industry Co., Ltd.

C14 Grant of patent or utility model
GR01 Patent grant