Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
  • F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
  • F04B9/10—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid
  • F04B9/109—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers
  • F04B9/111—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers with two mechanically connected pumping members
  • F04B9/113—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers with two mechanically connected pumping members reciprocating movement of the pumping members being obtained by a double-acting liquid motor
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
  • F04B15/02—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B7/00—Piston machines or pumps characterised by having positively-driven valving
  • F04B7/0019—Piston machines or pumps characterised by having positively-driven valving a common distribution member forming a single discharge distributor for a plurality of pumping chambers
  • F04B7/003—Piston machines or pumps characterised by having positively-driven valving a common distribution member forming a single discharge distributor for a plurality of pumping chambers and having a slidable movement
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
  • F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
  • F04B9/10—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid
  • F04B9/109—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers
  • F04B9/117—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers the pumping members not being mechanically connected to each other
  • F04B9/1176—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers the pumping members not being mechanically connected to each other the movement of each piston in one direction being obtained by a single-acting piston liquid motor
  • F04B9/1178—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers the pumping members not being mechanically connected to each other the movement of each piston in one direction being obtained by a single-acting piston liquid motor the movement in the other direction being obtained by a hydraulic connection between the liquid motor cylinders
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
  • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
  • F15B11/22—Synchronisation of the movement of two or more servomotors

Definitions

• the piston piston When the piston is required to be replaced, it must be returned to the water tank connected to the conveying rainbow and the driving cylinder. Disassemble and replace. Therefore, the design of the concrete conveying equipment structure requires consideration of the problem that the crucible piston is easy to disassemble and assemble.
• the piston piston exits one piston at a time, and its typical structure has the following three types: First, the structure connects the helium piston to the cylinder piston rod through the intermediate connecting rod, and the intermediate connection The rod and the piston and the cylinder rod can be bolted or connected by a ferrule (as shown in Figures 1 and 2).
• the structure includes a delivery cylinder 101, a helium piston assembly 102, a helium piston connection flange 103, an intermediate connecting rod 104, a water tank 105, a left driving oil red piston rod 106, (wherein “left” means the pump in the upper middle of the figure Red structure) left drive oil red rod cavity port 107, left drive oil red rod cavity 108, left drive oil red rod cavity fill pipe 109, left drive oil red tube 110, left drive oil red rodless cavity
• the method and step 4 of replacing the ⁇ piston assembly 102 by the pumping mechanism shown in Figures 1 and 2 are as follows:
• the hydraulic system pressure oil is driven from the left to the oil red rod chamber port 107 Entering the left driving oil red has a rod cavity 108, thereby pushing the left driving oil red piston 112 and the left 3 area moving oil red piston 4 dry 106 back, the left 3 area moving oil red oil passing through the left 3 area moving oil red no ⁇ ⁇ empty Oil Port 113 and right drive oil red no 4 dry cavity port 114 enters the right drive oil red without 4 dry cavity 116, so that 4 dances the right drive oil red piston 118 forward, when the left drive oil red to the head, the intermediate connecting rod 104 enters Water tank 105.
• the intermediate connecting rod 104 can be removed, and then the left driving oil red is operated to make the left driving oil red piston rod 106 forward, so that it is in contact with the helium piston connecting flange, and then the left driving oil rainbow piston rod 106 and the piston are bolted.
• the connecting flanges are coupled, and the left drive oil red is retracted, so that the piston assembly 102 is retracted into the water tank, so that the piston assembly 102 can be replaced (as shown in FIG. 2).
• the piston is restored in the reverse order. If you want to replace another piston, you can also operate it in this order. The difference is that the right drive cylinder is operated and the piston is retracted.
• This type of structure can only replace one ⁇ piston at a time, and it takes time and effort to operate and is inefficient.
• this structure is easier to achieve the replacement of the piston and the dimension of the piston than the first structure.
• This structure is mainly through the water tank between the conveying rainbow and the driving oil rainbow.
• a positioning sleeve is installed. Under normal circumstances, the positioning sleeve is always installed in the water tank, so that the piston is hit by the positioning sleeve when the piston is retracted, and the piston is not retracted into the water tank by the positioning sleeve.
• This structure is mainly realized by adding a limit oil rainbow to the rear of the driving oil rainbow.
• the limit cylinder is filled with hydraulic oil to form a closed cavity, and the piston is replaced by the piston of the limit cylinder. Blocked and can not be returned to the water tank, when you need to maintain or replace the piston, just press a button to let the oil in the limit cylinder return to the tank without pressure, then the piston will retreat The oil in the limit oil red is pressed out, so that the piston is more than the distance of the limit oil red stroke, and the piston can be retracted into the water tank.
• this structure is simpler and more convenient to operate.
• the disadvantage of the above solution is that only one helium piston can be withdrawn at a time.
• the concrete pumping structure and control method in the prior art has problems of low efficiency and repeated labor in solving the replacement and maintenance of the piston.
• the two pistons need to be withdrawn first and then the engine is shut down. After the system pressure is released, and then replaced, the engine is started to exit another ⁇ piston for replacement.
• the replacement of the engine requires two times each time, which takes a long time and affects the construction efficiency of the concrete pump. It is necessary to improve it.
• the two pistons use the same amount of time and wear similarly, so if they can be replaced at the same time, it has a significant significance for replacement efficiency.
• the technical problem to be solved by the present invention is to provide a concrete pumping structure capable of simultaneously retracting a double-twisted piston, thereby improving the efficiency of the untwisting piston.
• the invention provides a concrete pumping structure, comprising first and second pumping rainbow structures, each pumping cylinder structure comprising a conveying cylinder, a water tank and a driving oil rainbow, wherein the conveying rainbow is provided with a total piston piston And the piston rod driving the oil rainbow drives the piston assembly to reciprocate in the delivery cylinder during pumping operation, the water tank being located between the delivery cylinder and the drive cylinder, characterized
• the utility model further comprises: a hydraulic retracting system, wherein the retreating hydraulic system controls the two driving oil red to drive the two piston assemblies to return to the water tank at the same time.
• each pumping rainbow structure further comprises a limiting structure, wherein the limiting structure limits the limit during the pumping operation, the squeegee piston assembly is returned to the water tank and the limit is released when the slamming is released, and the ⁇ piston assembly is allowed to be allowed. Return to the water tank.
• the unloading hydraulic system includes an untwisting valve group and at least one pressure oil source, and the unloading valve group controls the at least one pressure oil source, and when the limiting structure is in a releasing limit state, passing the untwisting pipe
• the road supplies oil to the rod chamber ports of the two driving cylinders at the same time, and the rodless chamber ports simultaneously return oil. Therefore, by simultaneously supplying oil to the talented cavity port that drives the oil red, the non-dry cavity port is simultaneously returned to the oil to realize the simultaneous retraction of the double-twisted piston, which significantly improves the efficiency of the replacement of the piston.
• the limiting structure includes an untwisting auxiliary cylinder, the untwisting auxiliary red is located at the red end or inside of the driving oil, and the back valve group is assisted by the retreating auxiliary red
• the red port controls the retreat auxiliary red oil and oil return, and switches between the normal pumping working state and the releasing limit state.
• a piston is disposed in the untwisting auxiliary cylinder, and the driving cylinder is provided with a retreat 4 on a side facing the untwisting auxiliary cylinder, and the limit is achieved by the piston of the unloading and the retreating auxiliary cylinder .
• the unloading valve group only controls the unloading pipeline, it may be considered to additionally provide a control similar to the unloading valve group to the auxiliary rainbow port of the unloading auxiliary rainbow.
• the valve block is, for example, a combination of a two-way four-way valve and a one-way valve.
• the auxiliary cylinder port of the untwisting auxiliary cylinder can be oiled during operation, and the rear cavity of the auxiliary piston is locked by the locking action of the one-way valve, and the auxiliary oil port is assisted.
• the oil is returned at the time of retreat, and the retraction is achieved by driving the reversing rod of the oil-red piston to move back and forth.
• the untwisting line and the auxiliary cylinder port are connected to the unloading valve block.
• the detent valve set includes at least one reversing valve and at least one one-way valve.
• the untwisting valve group includes a first one-way valve, a first reversing valve, and a second one-way valve; the oil outlet of the first one-way valve is connected to In the untwisting pipeline, one working oil port of the first switching valve is connected to the oil inlet of the first one-way valve, and the other working oil port is connected to two i-help red oil ports, The oil inlet of the first reversing valve is connected to the oil outlet of the second one-way valve to be connected to the first pressure oil source and the oil outlet of the first reversing valve is connected to the return tank.
• the locking function of the first check valve ensures that the oil cannot be returned from the untwisting pipeline during normal operation
• the second check valve ensures that the oil is assisted by the oil supply through the cylinder port during normal operation.
• the rear cavity of the piston is locked.
• the unloading valve group includes a first pilot operated check valve, a first reversing valve, a second one-way valve, and a second reversing valve;
• the oil outlet of the first pilot operated check valve is connected to the untwisting pipeline, and the oil inlet and the control oil port of the first pilot operated check valve are respectively connected to the two working operations of the second pilot valve a fuel port, a return port of the second reversing valve is connected to the return tank and an oil inlet thereof is connected to one working port of the first reversing valve, and another working port of the first reversing valve is connected to the two ports
• the auxiliary oil port of the first reversing valve is connected to the oil outlet of the second check valve to be connected to the first pressure oil source and the oil return port of the first reversing valve is connected to the return tank.
• the action of the first pilot check valve and the first check valve of the previous embodiment is substantially the same, except that, at the time of unloading, the two helium pistons are returned to the oil supply to the untwisting pipe.
• the control port of the first pilot valve can be oiled by the reversal of the second reversing valve, so that it is possible to return the oil in the rod chamber of the untwisting line and the driving cylinder.
• the limiting structure includes a positioning sleeve installed in the water tank, and the positioning sleeve can restrict the retracting piston assembly from returning to the water tank during operation and when retracting Being removed allows the helium piston assembly to be returned to the water tank.
• the unloading valve group only controls the untwisting pipeline.
• the detent valve group is a combination of a two-position four-way valve reversing valve and a one-way valve, and the working port of the reversing valve is connected to the one-way valve.
• a valve inlet port, an untwisting line connected to the oil outlet of the one-way valve, and an oil inlet of the reversing valve is connected to the pressure oil source, and an oil outlet of the reversing valve is connected to the return tank. Therefore, it is possible to supply oil to the two talented cavities at the same time only when retreating, and it is impossible to return oil through the untwisting pipeline due to the locking action of the one-way valve during work.
• Another embodiment of the untwisting valve group includes the first check valve, the first reversing valve and the second reversing valve; the working port of the second reversing valve is connected to the check valve An oil inlet, an oil outlet of the one-way valve is connected to the untwisting pipeline, an oil inlet of the second switching valve is connected to a working oil port of the first switching valve, and the first The oil inlet of the reversing valve is connected to the pressure oil source and the oil outlets of the first reversing valve and the second reversing valve are connected to the return tank.
• it may be considered to integrate the first one-way valve and the second one-way valve into one valve.
• the second valve group is further included, and the rodless chamber port of the driving cylinder is controlled by the second valve group to simultaneously return oil when unloading.
• the second valve block can be used to simultaneously achieve oil return while retreating and oil during operation to drive the drive cylinder.
• the drive cylinder has four dry chambers communicating, and the non-dry chamber port of the drive cylinder is controlled by the second valve group so that one of the non-dry chamber ports is available during operation. Oil, and another incapable of returning oil to the moon. Therefore, it is possible to switch between the working state and the large state of the untwisting state in a simple manner.
• the oil is fed through a rodless chamber port, and since the rod chamber of the driving cylinder communicates with the other rod chamber port, one of the two pumping cylinder structures can be sucked, and The other is spraying.
• the untwisting line is connected at the same time to the rod chamber port of the drive cylinder, the return line cannot supply oil to the rod chamber port or return oil from the rod chamber port.
• the above-mentioned scheme can be adjusted correspondingly, for example, so that the untwisting pipeline supplies oil to the rod-cavity port at the same time when the untwisting pipeline is retracted, and neither oil nor oil is returned during work. At the time of retreat, oil is returned from two ports without a dry cavity.
• the second valve block comprises a third reversing valve and an overflow relief valve.
• the rodless chamber ports are respectively connected to the two working ports of the third reversing valve, and the inlet port of the third reversing valve is connected to the second Pressure oil source.
• the overflow relief valve is a cartridge overflow relief valve.
• the cartridge-type overflow unloading valve includes a cartridge valve and an electronically controlled valve that controls opening and closing of the cartridge valve. Therefore, in the working condition, the electric control valve can control the closing of the cartridge valve, so that the overflow relief valve is used as a normal relief valve, and the two unfilled ports cannot return oil to the return tank, but are unloaded. ⁇ I condition, the electric control valve can control the cartridge valve to open normally, returning oil from the two empty ports to the return tank.
• the first source of pressurized oil is an accumulator or an oil pump.
• the second source of pressurized oil is an accumulator or an oil pump.
• Other pressure oil sources can also be considered.
• the retreat assist red may be coupled to the drive oil red tail or the retraction assist red may be embedded inside the drive cylinder.
• the untwisting auxiliary piston is defined in the working position by a stop provided in the untwisting aid. This stop can be, for example, a cassette.
• the first reversing valve, the second reversing valve may be an electromagnetic reversing valve or a hydraulically actuated valve
• the third reversing valve may be an electromagnetic reversing valve, an electrohydraulic valve or a solenoid valve controlled cartridge valve. Valve group.
• the various reversing valves that provide electronically controlled commutation can be electronically switched between the operating state and the untwisting state, thus significantly increasing the degree of automation of the retraction.
• the invention also relates to a corresponding control method for a concrete pumping structure, comprising a normal pumping work control and an unloading control, wherein the unloading control comprises the following steps: a) controlling the unloading valve group, The rod chamber ports of the two driving cylinders are simultaneously supplied with oil, b) controlling the second valve group to make the rodless chamber port for driving the oil red return oil at the same time; driving the oil red piston rod to drive the two The piston assemblies are simultaneously returned to the water tank.
• the step c) of releasing the limit function of the limit structure which is carried out before or simultaneously with step a), is also included.
• the limiting structure includes an untwisting auxiliary cylinder, the untwisting auxiliary cylinder is located at the red end or the inside of the driving oil, and the returning valve group controls the auxiliary red oil port of the retreating auxiliary red
• the oil implements the step of controlling the intake of the auxiliary cylinder port to switch to the pumping operation state.
• the limiting structure includes a positioning sleeve that is installed in the water tank, and the step 4 is achieved by removing the positioning sleeve before step a). The invention can realize the simultaneous retraction of the double-twisting piston, and the efficiency of the untwisting piston is remarkably improved.
• FIG. 7a shows the present A first embodiment of the inventive concrete pumping structure
• Figure 7b shows an enlarged view of the corresponding hydraulic component
• Figure 8a shows a second embodiment of the concrete pumping structure of the present invention
• Figure 8b shows the corresponding
• Figure 9a shows a third embodiment of the concrete pumping structure of the present invention
• Figure 9b shows an enlarged view of the corresponding hydraulic component
• Figures 10, 11 show the concrete pumping of the present invention
• FIG. 12, 13, 14 shows a sixth, a seventh, an eighth embodiment of the present invention, the concrete pumping the structure. 12b, 13b, 14b show enlarged views of the corresponding hydraulic components;
• DETAILED DESCRIPTION OF THE INVENTION Fig. 7 shows a first embodiment of the concrete pumping structure of the present invention, since the present invention aims to solve the problem of untwisting, Only the graph in the untwisted state is shown.
• the mixed soil pumping structure of the present invention comprises first and second pumping cylinder structures, and the structures of the two pumping cylinder structures are the same.
• a pumping rainbow structure (located above the figure) in the pumping structure includes conveying red 1, piston assembly 2, water tank 3, piston connecting flange 4, clamp 5, driving oil red piston rod 6, driving oil red 7
• the oily red ported rod port 8 the oily red rod chamber 9, the fuel supply pipe 10, the horse area oil red piston 11, and the pre-return red 12.
• the components of a pumped rainbow structure are also marked with similar reference numerals, except that the symbol ' is marked on each label, so the reference mark portion is not marked separately.
• the driving oil red piston 6 in the driving oil red 7 is directly connected to the piston assembly 2 in the conveying red 1 through the ⁇ piston connecting flange 4 and the clamp 5.
• the drive cylinder 7 is controlled to reciprocate. Since the present invention focuses on the improvement of the retreat, it is not elaborated on how the driving oil red 7 normally controls the reciprocating motion by the concrete pump reversing control device (not shown).
• the retreat auxiliary red 12 may be connected to the inside of the driving oil red 7 or embedded in the driving oil red as shown in FIG. 7, and the auxiliary piston 13 is retracted by the auxiliary red oil port 14 and 14'.
• the vehicle is telescopically movable; the driving oil red piston 11 is provided with a retreat 4 dry 15 on the side facing the retreat auxiliary red 12.
• the untwisting auxiliary cylinder 12 and the untwisting auxiliary piston 13 disposed therein constitute a limit that restricts the return of the piston assembly 2 to the water tank 3 during operation.
• Bit structure. A movable unloading auxiliary piston 13 is disposed in the untwisting auxiliary cylinder 12, and the untwisting auxiliary piston 13 is oiled through an auxiliary cylinder port 14, 14 to limit the position during operation, and the said The helium piston assembly 2 is returned to the water tank 3 or returned to the oil to release the limit when the heel is removed, allowing the helium piston assembly 2 to be returned to the water tank 3.
• the limit is achieved by the untwisting 4 dry 15 and the untwisting auxiliary piston 13, wherein the retracting rod 15 is connected to the driving oil red piston 11 and is limited by the top retracting auxiliary piston 13 during operation.
• an unloading hydraulic system is further included, the untwisting hydraulic system includes an untwisting valve group 30, at least one pressure oil source 21, 23, and the unloading valve group controls the at least one pressurized oil source,
• the unloading hydraulic system controls the two drive cylinders 7 to drive the two of the piston assemblies 2 simultaneously into the water tank 3.
• the retreating line 18 and the driving oil red 7, 7, have the rod chamber ports 8, 8, which are controllably connected, that is, the untwisting line 18 is supplied to the rod chamber port 8, 8 at the same time oil.
• the ⁇ piston assembly 2, 2 can be returned to the water tank for replacement and repair, and the delivery cylinder and the drive oil red seal can also be replaced.
• the rodless chamber ports 17, 17, which drive the oil red 7, 7, return oil at the same time.
• the retraction line 18 supplies oil to the rod chamber ports 8, 8 while retracting, and does not return oil through the retraction line during normal operation.
• the unloading valve group 30 includes a first pilot operated check valve 24, a first reversing valve DT1, a second one-way valve 25, and a second reversing valve DT2; the oil outlet connection of the first pilot operated check valve 24 Up to the return line 18, the oil inlet of the first pilot operated check valve 24
• the control ports are respectively connected to the two working ports of the second reversing valve DT2, the oil return port of the second reversing valve DT2 is connected to the return tank 22 and the inlet port thereof is connected to a working of the first reversing valve DT1
• the oil port, the other working port of the first reversing valve DT1 is connected to the two auxiliary red oil ports 14 , 14 , and the oil inlet of the first reversing valve DT1 is connected with the oil outlet of the second one-way valve 25 .
• the first pressure oil source 21 is an accumulator, and may of course be another pressure oil source such as an oil pump.
• the first reversing valve DT1 and the second reversing valve DT2 are electromagnetic two-position four-way valves in this embodiment.
• the working port of the first reversing valve DT1 connected to the auxiliary red oil ports 14 and 14, the working port of the first reversing valve DT1 is connected to the oil inlet of the first reversing valve DT1, the first reversing direction
• the working port of the valve DT1 that is connected to the oil inlet of the second switching valve DT2 is connected to the oil outlet of the first switching valve DT1.
• the working port of the first reversing valve DT1 connected to the auxiliary cylinder ports 14 and 14, the working port of the first reversing valve DT1 is connected to the oil outlet of the first reversing valve DT1, the first exchange
• the working port connected to the oil inlet of the second switching valve DT2 of the valve DT1 is connected to the oil inlet of the first switching valve DT1.
• the working port of the second reversing valve DT2 connected to the oil inlet of the first check valve 24 is connected to the oil outlet of the second reversing valve DT2, and the second reversing valve DT2
• the working port to which the control port of the one-way valve 24 is connected is connected to the oil inlet of the second switching valve DT2.
• the working port of the second reversing valve DT2 connected to the oil inlet of the first check valve 24 is connected to the oil inlet of the second reversing valve DT2, and the second reversing valve DT2
• the working port to which the control port of the first check valve 24 is connected is connected to the oil port of the second switching valve DT2.
• the second check valve 25 ensures that the rear cavity lock of the unloading auxiliary piston 13 is achieved by the oil supply through the auxiliary cylinder port during normal operation, and the rear chamber is filled with pressurized oil, and the pressure oil is due to the second single
• the valve 25 is not recirculated, thereby locking the retracting auxiliary piston 13 to the stopper portion 16, providing a possibility that the reversing control mechanism for driving the oil-red piston 11 is malfunctioning in the case where the driving oil red 7 stroke is lengthened during normal operation.
• the limit protection of the time prevents the piston assembly 2, 2 from returning to the water tank 3 during normal operation.
• the oil is discharged to the return tank through the auxiliary red oil ports 14, 14', and the unloading is achieved by driving the oil red pistons 6, 6'.
• the rodless chamber port 17, 17, which drives the oil red 7, 7, is controlled by the second valve group to return oil at the same time.
• the second valve block includes a third reversing valve DT3 and an overflow relief valve 27.
• the rodless chamber ports 17, 17 are respectively connected to the two working ports of the third switching valve DT3, and the inlet port of the third switching valve is connected to the second pressure oil source 23.
• the overflow relief valve 27 is connected between the third switching valve DT3 and the second pressure oil source 23, and the other side is connected to the return tank 22.
• the second pressure oil source 23 is an accumulator or an oil pump.
• the oil red 7,7, the rod chambers 9, 9 are communicated, and the rodless chamber ports 17, 17, which drive the oil red 7, 7 are operated by the third reversing valve DT3 and the overflow.
• the relief valve 27 is controlled such that one of the rodless chamber ports supplies oil while the other rodless chamber port returns oil. In the retracted state, the two rodless chamber ports 17, 17, return oil.
• the oil is fed through a port without a dry cavity, and since the oil red 7,7, the rod chamber 9,9 is connected, the other rod-free port is returned to the oil, which can be realized.
• One of the two pumped red structures is suctioned and the other is sprayed.
• the retreating line 18 cannot supply oil to the rod-port port at this time. There is a rod cavity oil return. Therefore, the untwisting line has no effect on the normal pumping process.
• the above scheme can be adjusted accordingly, for example, the retreating pipeline is supplied with oil at the same time as the retreating pipeline, and at the time of working, there is no oil or oil returning, but When returning to the oil, return oil from the two empty ports.
• the third reversing valve DT3 in the second valve group can determine which of the non-drying port oil inlets is in normal operation, and the other rodless port port returns to the oil.
• the above concrete pumping structure capable of simultaneously withdrawing the double helium piston is as follows: When two pistons are to be withdrawn at the same time, the hydraulic oil is simultaneously fed from the two oily ports 7, 8' which drive the oil red 7, 7, Oil, at the same time two drive oil rainbow 7, 7, no rod cavity is connected to the pressure-free tank, and two unloading auxiliary red 12, 12, the auxiliary red oil port 14, 14, also connected to the fuel tank, then two The driving oil red piston and the piston rod are simultaneously retracted under the action of the oil pressure, and the piston rod will bear against the untwisting auxiliary piston in the unloading auxiliary cylinder, so that the two plugs connected to the two driving oil red piston rods simultaneously transmit the red The inside is returned to the water tank, so that the two pistons and the two delivery cylinder seals can be replaced.
• FIG 8 shows a second embodiment of the concrete pumping structure of the present invention.
• the detent valve group 30 includes a first one-way valve 24, a first reversing valve DT1, and a second one-way valve 25; the oil outlet of the first one-way valve 24 is connected to the untwisting line 18, the first reversing One working port of the valve DT1 is connected to the oil inlet of the first check valve 24, and the other working port is connected to the two auxiliary red oil ports 14, 14, the oil inlet of the first switching valve DT1 and the first
• the oil outlet connection of the two check valve 25 is in turn connected to the first pressure oil source 21 and the DT1 oil outlet of the first switching valve is connected to the return tank 22.
• the working port of the first reversing valve DT1 connected to the auxiliary red oil ports 14 and 14, the working port of the first reversing valve DT1 is connected to the oil inlet of the first reversing valve DT1, the first reversing direction
• the working port of the valve DT1 that is connected to the oil inlet of the first check valve 24 is connected to the oil port of the first switching valve DT1.
• the working port of the first reversing valve DT1 connected to the auxiliary cylinder ports 14 and 14, the working port of the first reversing valve DT1 is connected to the oil outlet of the first reversing valve DT1, the first exchange
• the working port connected to the oil inlet of the first check valve 24 of the valve DT1 is connected to the oil inlet of the first switching valve DT1.
• the difference between the first pilot operated check valve 24 in FIG. 7 and the first one-way check valve in FIG. 8 is that, after the returning, after the oil is supplied to the untwisting line, the two helium pistons are returned to the water tank.
• FIG. 9 shows a third embodiment of the concrete pumping structure of the present invention.
• the second valve block is omitted, but the rodless chamber ports 17, 17, are directly connected to the return tank through the lines 19, 19.
• the untwisting function is realized independently of the control device that reciprocally drives the driving oil red.
• the control of the untwisting line 18 and the auxiliary rainbow ports 14, 14 are integrated in the same unloading valve group.
• the control of the untwisting line 18 and the auxiliary cylinder ports 14, 14' can also be performed separately.
• the untwisting line 18 is connected to the unwinding valve group 30.
• the unloading valve block 30 includes a reversing valve and a one-way valve, and the working port of the reversing valve is connected to the check valve inlet port, and the oil outlet of the one-way valve is connected to the untwisting line 18
• the oil inlet to the valve is connected to the pressure oil source and its oil outlet is connected to the return tank.
• a control valve group similar to the unloading valve group to the auxiliary red oil port of the auxiliary auxiliary red, for example, a combination of a two-way four-way valve and a one-way valve, jt ⁇ When the working port of the reversing valve is connected to the auxiliary rainbow port, the reversing valve
• the oil inlet is connected to the oil outlet of the one-way valve, and the oil inlet of the one-way valve is connected to the pressure oil source, and the oil outlet of the two-way valve is connected to the oil return tank.
• Figures 10, 11 show a fourth and fifth embodiment of the concrete pumping structure of the present invention. In Fig.
• two untwisting lines 18 are provided which respectively lead to the rod chamber ports 8, 8 of the respective driving cylinders.
• the design of the unloading valve group is adjusted correspondingly, and the number of the first one-way valves 24 is adjusted. Set to two, as shown in the working state diagram of Figure 10a and the unloading state diagram of Figure 10b.
• Figure 11 is provided with an untwisting line 18 leading to the rod chamber ports 8, 8 of the drive cylinder, in this embodiment, the retracting valve group includes an integrated first check valve and a second exchange A two-position two-way valve DT2 for the function of the valve and a first reversing valve DT1 and a second one-way valve 25 designed as a two-position four-way valve, as shown in the unloading state diagram of FIG. 11a and the working state of FIG.
• Figures 12, 13, and 14 show sixth, seventh, and eighth embodiments of the concrete pumping structure of the present invention. Wherein, the limiting structure adopts a positioning sleeve.
• each positioning sleeve can be first removed, and then passed through the retreating pipe 18 through the retreating valve group.
• Each of the driving oil red has a rod cavity port 8, 8, and is supplied with oil at the same time.
• the second valve block is not provided at this time.
• the untwisting valve group includes a first one-way valve 24 and a first reversing valve DT1, and an oil inlet of the first one-way valve 24 is connected to the first reversing valve DT1.
• a working port, the inlet port of the first reversing valve DT1 is connected to the pressure oil source, and the oil outlet is connected to the return tank.
• the valve return group includes a first pilot operated check valve 24, a second diverter valve DT2, and a first reversing valve DTI, and the oil inlet of the first check valve 24 is connected to a working port of the second reversing valve DT2, the oil inlet of the second reversing valve DT2 is connected to one working port of the first reversing valve DT1 and the oil outlet is connected to the return tank, the first reversing port
• the oil inlet of valve DT1 is connected to the source of pressure oil and the outlet port is connected to the return tank.
• the untwisting valve group includes a 2/2-way valve DT2 integrated with the functions of the first check valve and the second reversing valve, and a first change designed as a 2/2-way valve To the valve DT 1.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• Reciprocating Pumps (AREA)
• On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)

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• 2010
  • 2010-03-16 CN CN2010101252406A patent/CN101793246B/zh active Active
• 2011
  • 2011-03-16 US US13/634,417 patent/US9322398B2/en not_active Expired - Fee Related
  • 2011-03-16 KR KR1020127023766A patent/KR20130060168A/ko not_active Ceased
  • 2011-03-16 EP EP11755673.8A patent/EP2549104A4/en not_active Withdrawn
  • 2011-03-16 JP JP2012557390A patent/JP5771633B2/ja not_active Expired - Fee Related
  • 2011-03-16 WO PCT/CN2011/071872 patent/WO2011113356A1/zh not_active Ceased

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