JP6194360B2 - Device for controlling the drive of a two-cylinder rich material pump - Google Patents

Description

The invention relates to a device for the drive control of a general type two-cylinder rich substance pump as specified in the preamble of claim 1.

2 Cylindrical thick material pump of this type, you merge into wood RyoSoIri container via the end surface orifice, has two conveyor cylinders, the conveyor piston, to perform the transfer stroke and the filling stroke, It can be actuated by a drive cylinder that operates alternately hydraulically in reciprocating motion. A pipe switch is arranged inside the material charging container, and the pipe switch can be connected to the orifice of one of the transfer cylinders alternately on the inlet side by a hydraulic drive mechanism. Each time, the orifice of the other conveying cylinder is opened, and the pipe switch is connected on the outlet side to a conveying line for the concentrated material to be conveyed. Furthermore, thick material pump has a suction port connected to the reservoir, a motor driven variable displacement hydraulic pump having a high pressure outlet.

Drive cylinders for conveying piston, via respective hydraulic connector installed at one end thereof, by a first reversing valve, the high pressure outlet of the variable displacement pump through a delivery line, also and to the reservoir via the return line can be connected alternately. Drive cylinder, at their other end, through a locking oil line, Ru Tei connected to each other. On the other hand, the hydraulic drive mechanism of the pipe switch, for example, has a cylinder arrangement that operates in both forms in the form of two serially connected plunger cylinders, and the connection is variable via a second backwash valve. a delivery line leading to the high pressure outlet of the displacement hydraulic pump, a return line leading to the reservoir may be connected alternately. A central control is provided to initiate additional value control for the first backwash valve and the second backwash valve, which is responsive to the end signal of the stroke of at least one passing drive piston of the drive cylinder. .

  Thick transfer and pipe switch reversal take place alternately in a single circuit device via the same variable displacement pump that can be set continuously between zero transfer and the required maximum transfer. The settings for dense transport are based on the transport amount required by the operator at the set member and adapted to the requirements. On the other hand, in order to invert the pipe switch, the purpose is to have a specified switching time for the transport amount setting in the machine alone. In order to set the conveying stream, the variable displacement pump has a conveying flow regulator whose control inlet is acted on at the conveying stage by various control pressures adapted to the set conveying amount, Thus, it is acted upon in the reversal phase by a defined reversal pressure. Thus, the control inlet of the transport flow regulator can be actuated by different pressure control signals in the transport stage and the reversal stage. For this purpose, a switching valve (SOS valve) designed as a directional valve has been conventionally used. In other words, this means that the control signal for the conveying flow regulator appears on a different control line that is switched to the control inlet at each operating stage by the backwash valve.

  One disadvantage of this type of control is that two control signals generated independently of each other are used to control the variable displacement pump, and between its transport and reversal phases for its proper selection. It is necessary to have a switching valve that operates electromagnetically. This requires significant costs in terms of both hardware and control items.

  Emerging from this, the object on which the present invention is based is to improve a known device for the drive control of a concentrate pump to the effect that simplification of the hydraulic switching device can be achieved without loss of functional performance. That is.

  In order to achieve this object, a combination of features specified in claim 1 is proposed. Advantageous refinements and developments of the invention are gathered from the dependent claims.

The solution according to the invention essentially consists in that the set throttle is arranged in the delivery line between the high pressure outlet of the variable displacement pump and the first backwash valve, the control line directly leading to the adjustment device of the variable displacement pump. A branch line is branched from the delivery line downstream of the set throttle, and a connection line leading to the supply connection of the second backwash valve is branched from the delivery line upstream of the set throttle. A throttle that is fixedly set may be arranged in the connection line as necessary. The distinguishing feature of the present invention is that, therefore, the regulator of the variable displacement pump, including the load sensing regulator, can be operated via only one control line, and the known switching valve is dispensed with. is there. This is possible in that the variable displacement pump additionally constitutes a pressure regulating device for adjusting (downward adjusting) the transport amount when the desired maximum pressure at the high pressure output is exceeded. This maximum pressure is always reached when the drive pistons reach their limit stop during the transport operation and the pressure difference detectable at the set throttle becomes zero. This is exactly the situation where the reversal of the pipe switch is initiated via the second backwash valve. In this case, the fixed throttle, the maximum pressure is present caused by the high pressure outlet of the variable displacement pump, the maximum pressure, the transport stream that communicates through a defined flow cross section of the connecting line (flow cross section) a is, the transport stream toward the plunger cylinder is acted upon by the pressure in the moment leads. This transport flow can preferably be pre-adjusted so that the reversal of the pipe switch is carried out within a preset time, for example 200 ms, via the fixed throttle flow cross section and the maximum pressure in the connecting line. Therefore, the variable displacement pump is being conveyance flow control during the actual transfer operation, unlike conventional on the other hand, are pressure adjusted through a pre-set maximum pressure was during the inversion operation Result.

In a further preferred refinement of the invention, the load sensing hydraulic system, as the adjustment member, mechanically adjustable swash plate disposed in the variable displacement pump, is connected to the swash plate, the force side (force side) has a pressure balance which is spring-supported, and the said pressure balance, Ru Tei are connected by the control line load side is branched downstream of the set throttle (load side).

In order to ensure a flawless change between the transfer phase and the reversal phase during the pumping operation of the two-cylinder rich material pump, according to a preferred improvement of the invention, the drive cylinder is connected to the passing drive piston. It is proposed to have at least two cylinder switching sensors in response and connected on the output side to the central control signal input. By this means it is possible to start the reverse operation at some time before the drive piston stops at the cylinder end. Since the inversion operation through the reversing valve is possible only with a time delay, which is required. Therefore, the impact stop of the drive piston at the end of the cylinder, which can lead to premature wear, can be avoided. The same is before reaching the end position of the Puranjashirindagaso these upon reversal of the pipe switch, apply mutatis mutandis also already inversion of the first reversing valve to start. To enable this, the pipe switch drive mechanism is also responsive to position, speed, or end position of the pipe switch, and at least one pipe switch sensor connected on the output side to a single input of the central control. Have To achieve all this, with respect to further advantageous refinement of the invention, a plurality of backwash valve is designed as a directional valve having a plurality of electromagnetic pilot control member, their pilot control members each one of the central control Connected to the control output.

  The invention is explained in more detail below by means of exemplary embodiments shown in the drawings in the drawing.

It is the fragmentary sectional view which showed the detail of the 2 cylinder type rich substance pump. FIG. 3 shows a circuit diagram of driving hydraulic pressure for a two-cylinder rich material pump.

The driving hydraulic pressure illustrated in the hydraulic circuit diagram according to FIG. 2 is intended for a two-cylinder rich material pump according to FIG. The rich substance pump has two transfer cylinders 14, 14 ′, whose end orifices 12, 12 ′ are delivered to the material charging container 10. Thick material conveying piston pumps 16, 16 ', filling stroke (arrow 19' to perform) and the conveying stroke (arrow 19 '), in a reciprocating motion, a drive cylinder runs in hydraulic manner alternately 18 Furthermore, pipe switches 22 that can be alternately connected to one orifice 12 of the transfer cylinder 14 on the inlet side by a hydraulic drive mechanism 24 are installed inside the material charging container 10. On the other hand, the pipe switch 22 releases the orifice 12 'of the other transport cylinder 14' each time.The pipe switch 22 is connected to the transport line 26 on the outlet side, and is further driven by a motor 27. variable capacity fluid pressure pump 28 is provided, which includes a suction port 32 connected to a normal pressure reservoir 30, a high is connected to the delivery line 34 Having an outlet 36.

The drive cylinders 18, 18 ′ are each a first designed as a 4 / 3-way valve (4 / 3-way valve) via a hydraulic connection 38, 38 ′ installed at one of their ends. The backwash valve 40 can be alternately connected to the high-pressure outlet 36 of the variable capacity pump 28 via the delivery line 34, and can be connected to the storage tank 30 via the return line 42. Furthermore, the drive cylinders 18, 18 ′ are connected to each other at their other end via a locking oil line 44.

The hydraulic drive mechanism 24 of the pipe switch 22 is connected to a delivery line 34 leading to the high-pressure outlet 36 of the variable displacement hydraulic pump 28 and a return line 50 leading to the storage tank 30 via the second backwash valve 48. , Including two series connected plunger cylinders 46 that may be connected alternately. Further, provided with a central control 56, which responds to 'at least one drive piston 20, 20 passes of the' stroke-end signal of driving dynamic cylinders 18 and 18, through which the first reversing valve Additional value control for 40 and the second backwash valve 48 may be initiated .

A set throttle 58, which can be continuously adjusted by the operator to control the delivery flow of the concentrate pump, is a delivery line 34 between the high pressure outlet 36 of the variable displacement pump 28 and the first backwash valve 40. Placed in. A unique feature of the present invention is that the control line 62 directly leading to the regulator 60 of the variable displacement pump 28 is fed back from the delivery line 34 downstream 58 ′ of the setting throttle 58 and the second backwash valve 48. A connection line 66 leading to the supply connection 64 is branched from the delivery line 34 upstream 58 ″ of the setting throttle 58 , and a fixedly set throttle 68 is arranged in the connection line 66 as required. It is.

Adjusting device 60 includes a load sensing hydraulic system 70 causing hydraulic power adjustment, both the pressure and volumetric flow rate of the variable displacement pump 28 during its adjustment, is adapted to the state is Ru required by the consumer The The pressure loss at the setting throttle 58 is used as a control variable.

In the illustrated exemplary embodiment, the load sensing hydraulic device 70 is connected to the mechanically adjustable swash plate 72 disposed in the variable displacement pump 28 and the swash plate 72 as the adjusting member, and a pressure balance 73, which is spring-supported, there, control line 62 is branched downstream of the setting throttle 58 is connected with a load side. The variable displacement pump 28 can be continuously adjusted from zero conveyance power to full conveyance.

At the zero position of the backwash valves 40, 48 designed as 4/3 way valves, no hydraulic oil flows through the line, except for leakage oil loss. At the same time, the variable displacement pump 28 maintains the standby pressure. Then, thus to open one of the reverse Araiben 40 and 48, hydraulic fluid, in the area of the region and the plunger cylinder 46 of the driving cylinder 18, 18 ', when transmitted to the driver, of the variable displacement pump 28 The carrying capacity increases automatically. In each case, the variable displacement pump 28 delivers only enough hydraulic fluid to maintain the currently required delivery pressure for the required delivery capacity.

A unique feature of the present invention is that although not shown, the variable displacement pump 28 additionally includes a pressure adjustment device to adjust the transport amount when a preset maximum pressure is exceeded. is there. This adjustment function is used for the operation (activation) of the drive mechanism 24 for the pipe switch 22.

As can be seen from FIG. 2, the drive cylinders 18, 18 'are responsive to the passing drive pistons 20, 20' and two cylinder switching sensors connected on the output side to the signal inputs 52 ', 54' of the central control 56. 52, 54. Furthermore, the driving mechanism 24 of the pipe switch 22, the position of the pipe switch, in response to the speed or end state, with a pipe switch sensor 74 connected at the output side to a further signal input 74 'of the central control 56. The backwash valves 40, 48 are designed as directional valves having electromagnetic pilot control members 76, 78. The pilot control members 76 and 78 are connected to control outputs 76′78 ′ of the central control unit 56 , respectively . Operating signals for conveying piston drive and the pipe switch driving the reversing valve 40 and 48, from the signal resulting from the cylinder switching sensors 52, also from a signal resulting from the coupling pipe switch sensor 74 in some cases, is calculated .

During the transport phase, hydraulic oil is driven from the variable displacement pump 28 via the delivery line 34, the set throttle 58 and the backwash valve 40 for the transport pistons 16, 16 'performing the transport stroke 19 ". Correspondingly, the oil volume of the variable displacement pump 28 flows to the load sensing hydraulic pressure by setting the pressure loss at the set throttle 58 via the control line 62 during the conveying phase. is set through the device 70. during movement of the pipe switch, hydraulic oil, via a connection line 66 and the backwash valve 48, flows into the plunger cylinder 46 to perform the delivery stroke. at this stage, the driving piston 20, 20 'since their limit stop, the maximum pressure is generated in the high pressure outlet 36 of the variable displacement pump 28. maximum pressure Amount of oil passing through the connection line 66 under the action, so that the pipe switch 22 is switched inside the wood RyoSoIri container 10 within the time prescribed order of 2 00Ms through the plunger cylinder 46, is calculated For this purpose, a fixed throttle 68 is arranged in the connection line as required.

In short, the following statement is created: The present invention relates to an apparatus for driving control of a two-cylinder rich substance pump having a pipe switch 22 arranged in a material charging container 10, and includes a motor-driven variable displacement hydraulic pump 28 through which Both the rich material pump drive cylinders 18 and 18 'and the pipe switch drive mechanism 24 operate. A unique feature of the present invention is that a setting throttle 58 is disposed in the delivery line 34 between the high pressure outlet 36 of the variable displacement pump 28 and the drive cylinders 18, 18 ′ of the concentrate pump, and the adjustment device of the variable displacement pump 28. A control line 62 directly leading to 60 is fed back from the delivery line 34 downstream of the setting throttle 58, and a connection line 66 leading to the pipe switch hydraulic supply connection 64 is branched from the delivery line 34 upstream of the setting throttle 58, A throttle 68 that is fixedly set is arranged in the connection line. Depending on it, the oil flow, while the conveying stage is adjusted conveyed stream, it is to be pressure adjusted by reversed phase is achieved. The latter is the case where the variable displacement pump 28 additionally includes a pressure adjusting device in order to adjust the conveyance amount when the preset maximum pressure is exceeded.

10 Material charging container 12, 12 'Orifice s (Conveying cylinder s)
14, 14 'transport cylinder 16, 16' transport piston 18, 18 'drive cylinder 19' filling stroke 19 '' transport stroke 20, 20 'drive piston 22 pipe switch 24 drive mechanism 26 transport line 27 motor 28 variable capacity pump 30 storage Tank 32 Suction port 34 Delivery line 36 High pressure outlet 38, 38 'Hydraulic connection 40 First backwash valve 42 Return line 44 Locking oil line 46 Plunger cylinder 48 Second backwash valve 50 Return line 52, 54 Cylinder switching sensor 52 ', 54' stroke end signal 56 central control 58 set throttle 58 'downstream 58''upstream 60 regulator 62 control line 64 supply connection 66 connection line 68 throttle (fixed) throttle 70 load sensing hydraulic device 72 Swash plate 73 Pressure Lance 74 Pipe switch sensor 74 'signals input 76, 78 pilot control member 76', 78 'control output

Claims (9)

Two feed cylinders (14, 14 '), a filling stroke (19') and a feed stroke (19 ") are delivered to the material charging container (10) through the end face orifices (12, 12 '). And a transfer piston (16, 16 ') which can be actuated by a drive cylinder (18, 18') which is alternately hydraulically actuated in a reciprocating motion,
It is arranged inside the material charging container (10) and is alternately connected to one end face orifice (12) of the transfer cylinder (14, 14 ') on the inlet side by a hydraulic drive mechanism (24). A pipe switch (22) connected to the transfer line (26) on the outlet side, releasing the end face orifice (12 ′) of the other transfer cylinder (14, 14 ′) each time,
Normal pressure reservoir (30) connected to the suction port (32), a motor driven variable displacement hydraulic pump and a high pressure outlet (36) (28),
The drive cylinders (18, 18 ') are each fed by a first backwash valve (40) via a hydraulic connection (38, 38') arranged at one of their ends. ) Can be alternately connected to the high-pressure outlet (36) of the variable displacement pump (28) and the storage tank (30) via a return line ( 42 ),
The drive cylinders (18, 18 ') are connected to each other at their other end via a locking oil line (44);
The hydraulic drive mechanism (24) of the pipe switch (22) has a cylinder arrangement that operates in both directions, and the connection is made via the second backwash valve (48) to the variable displacement hydraulic pressure. Alternately connected to the delivery line (34) leading to the high pressure outlet (36) of the pump (28) and the return line (50) leading to the reservoir (30);
At least one passing drive piston (20, 20 ') of the drive cylinder (18, 18') to trigger additional value control for the first and second backwash valves (48). In a device for driving control of a two-cylinder rich material pump with a central control (56) responsive to the end signal of the stroke)
A setting throttle (58) is disposed in the delivery line (34) between the high pressure outlet (36) of the variable displacement pump (28) and the first check valve (40),
A control line (62) directly leading to the adjusting device (60) of the variable displacement pump (28) is fed back from the delivery line (34) downstream of the set throttle (58),
The connection line (66) leading to the supply connection (64) of the second backwash valve (48) branches off from the delivery line (34) upstream of the set throttle (58). . Device according to claim 1, characterized in that a fixedly set throttle (68) is arranged in the connection line (66).   3. A device according to claim 1 or 2, characterized in that the cylinder arrangement operating in both comprises two series connected plunger cylinders, the connection being connected to the second backwash valve. .   4. The variable displacement pump (28) according to any one of claims 1 to 3, wherein the variable displacement pump (28) includes a pressure adjusting device for adjusting the transport amount when a required maximum pressure is exceeded. apparatus. The adjusting device (60) is seen containing a load sensing hydraulic system (70), this time, the adjusting device (60) with the load sensing hydraulic system (70), the set throttle as a control variable ( 58. The apparatus according to claim 1 , wherein the output of the variable displacement pump (28) is adjusted based on the pressure loss at 58) . The load sensing hydraulic device (70) is connected to the mechanically adjustable swash plate (72) disposed in the variable displacement pump (28) and the swash plate (72) as an adjustment member, a spring supported pressure balance in the side (73), there, that the control line is branched downstream (58 ') of the set throttle (58) (62) is connected to the load side The device according to claim 5, characterized in that:   The drive cylinder (18, 18 ′) is responsive to the passing drive piston (20, 20 ′) and, on the output side, is connected to at least two cylinder switching sensors (56) connected to the signal input of the central control (56). 52. A device according to any one of the preceding claims, characterized in that   The drive mechanism (24) of the pipe switch (22) is responsive to position, speed, or end of stroke of the pipe switch (22) and is connected on the output side to a further signal input of the central control (56). Device according to any one of the preceding claims, characterized in that it comprises at least one pipe switch sensor (74) that is adapted. The backwash valve (40, 48) is designed as a directional valve having an electromagnetic pilot control member (76, 78), their these pilot control member (76, 78) respectively, the central control (56) 9. Device according to any one of the preceding claims, characterized in that it is connected to one control output (76 ', 78').

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