CN104514766B - Central hydraulic pump and hydraulic oil circulating system thereof - Google Patents

Abstract

A hydraulic oil circulation system includes a high-pressure oil tank, a low-pressure oil tank, a switch assembly and a plurality of pressure regulating reversing valves. The hydraulic oil circulation system allows the hydraulic oil of each hydraulic device to flow back to the low-pressure oil tank through the pressure reducing return pipe port, and then be uniformly re-pressed into the high-pressure oil tank for circulation and continued distribution, so that one hydraulic oil circulation system can correspond to multiple hydraulic devices located on different links, which is not only conducive to optimizing the structural design, but also improves the integration of the hydraulic oil circulation system. At the same time, a central hydraulic pump using the hydraulic oil circulation system is also provided.

Description

Central hydraulic pump and its hydraulic oil circulation system

technical field

The invention relates to the technical field of hydraulic pumps, in particular to a central hydraulic pump and a hydraulic oil circulation system thereof.

Background technique

The hydraulic pump is the power component of the hydraulic system. It is driven by the driving mechanism, sucks the oil from the hydraulic oil tank, forms the pressure oil and discharges it, and sends it to the actuator (such as a hydraulic device).

Due to the particularity of hydraulic devices, many industries are widely used. However, there are many kinds of hydraulic components at present, and various manufacturers cannot coordinate and standardize the functions, specifications, types, performances, parameters, etc., so there are many phenomena that "one hydraulic component needs to be equipped with a set of hydraulic pumps". . Therefore, the hydraulic oil circulation system of a traditional hydraulic pump is usually a hydraulic oil circulation system corresponding to a hydraulic device, and the integration degree is low.

Contents of the invention

Based on this, it is necessary to address the above problems and provide a central hydraulic pump and a hydraulic oil circulation system that can correspond to multiple hydraulic devices.

A hydraulic oil circulation system, comprising:

A high-pressure oil tank, a plurality of high-pressure oil outlet holes are opened on the side wall of the high-pressure oil tank, and a first through hole is opened on the top of the high-pressure oil tank;

The low-pressure oil tank has a first end and a second end, the first end is inserted into the high-pressure oil tank through the first through hole, a second through hole is opened at the end of the first end, the A baffle is also arranged in the low-pressure fuel tank, and the baffle is located between the first end and the second end, and a third through hole is opened on the baffle, and the side wall of the low-pressure fuel tank is provided with Multiple low-pressure oil return holes;

The switch assembly includes a telescopic spring and an isolation top core, one end of the telescopic spring is arranged on the first end and on the hole wall of the second through hole, and the isolation top core is arranged on the other end of the telescopic spring one end and capable of opening or closing the third through hole; and

A plurality of pressure regulating reversing valves, each pressure regulating reversing valve includes a motor, a valve core and a valve sleeve housing, the motor can drive the valve core to rotate in the valve core housing, the side of the valve core A first channel and a second channel communicating with each other are opened on the wall, and a positioning groove is also provided on the side wall of the valve core, and the positioning groove is spaced apart from the first channel and the second channel. A positioning spring and a positioning top core are accommodated in the positioning groove, and a high-pressure input nozzle, a high-pressure output nozzle and a decompression return nozzle are arranged at intervals on the side wall of the valve sleeve housing. The high-pressure oil outlet hole is connected, the high-pressure output nozzle is used to communicate with the hydraulic device, and the decompression return nozzle is connected to the low-pressure oil return hole.

In one of the embodiments, it further includes a hydraulic pipe connection assembly, the hydraulic pipe connection assembly includes an elbow joint and nuts, and the nuts are arranged at both ends of the elbow joint.

In one of the embodiments, the outer surface of the high-pressure oil tank is provided with a plurality of cooling grooves, and the plurality of cooling grooves are arranged at intervals, and the outer surface of the high-pressure oil tank provided with high-pressure oil outlet holes is a plane.

In one of the embodiments, the side wall of the first end of the low-pressure oil tank inserted into the high-pressure oil tank is provided with external threads, the first through hole of the high-pressure oil tank is provided with internal threads, and the high-pressure oil tank It is screwed together with the low-pressure oil tank.

In one of the embodiments, the first end of the low-pressure oil tank inserted into the high-pressure oil tank is tapered, and a stepped structure is formed on the outer surface of the low-pressure oil tank.

In one of the embodiments, a sealing cover is further provided, and the sealing cover is mounted on the second end by fastening screws, and the sealing cover and the low-pressure oil tank enclose a receiving chamber.

In one of the embodiments, the pressure regulating reversing valve further includes a sealing cover, and the sealing cover is arranged on the valve sleeve housing.

In one embodiment, a step is further provided on the valve sleeve housing, and a boss is provided on a side of the sealing cover facing the valve sleeve housing, and the boss abuts against the step.

In one of the embodiments, a slot is provided on the side wall of the step, a buckle is provided on the side wall of the boss, the buckle is snapped into the slot, and the valve sleeve housing There is also a stroke card slot on the inner side wall, and the positioning top core can be snapped into the travel card slot.

A central hydraulic pump comprising:

Support base;

a hydraulic oil circulation system as described in any of the above; and

The piston moves back and forth in the low-pressure oil tank, so that the hydraulic oil in the low-pressure oil tank forces the isolation top core to compress the telescopic spring, thereby opening the third through hole, and the hydraulic oil flows from the low-pressure oil tank. The fuel tank is pressed into the high-pressure fuel tank through the third through hole and the second through hole in turn, and the bottom of the piston is provided with a drainage notch, and the drainage notch is connected to the decompression return pipe port. correspond.

The above-mentioned hydraulic oil circulation system has at least the following advantages:

The hydraulic oil circulation system allows the hydraulic oil of each hydraulic device to flow back to the low-pressure oil tank through the decompression return pipe, and then re-pressed into the high-pressure oil tank for circulation and continuous distribution. A hydraulic oil circulation system can correspond to multiple locations in different locations. The hydraulic components on the link are not only conducive to optimizing the structural design, but also improve the integration of the hydraulic oil circulation system.

Because the above-mentioned central hydraulic pump uses the above-mentioned hydraulic oil circulation system, it also has the ability to realize that one hydraulic oil circulation system can correspond to multiple hydraulic devices located on different links, which is not only conducive to optimizing the structural design, but also improves the performance of the hydraulic oil circulation system. Advantages of integration.

Description of drawings

Fig. 1 is a schematic diagram of assembly of a central hydraulic pump in an embodiment;

Fig. 2 is an exploded schematic diagram of the central hydraulic pump shown in Fig. 1;

Fig. 3 is an exploded schematic diagram of a high-pressure fuel tank, a low-pressure fuel tank and a switch assembly in Fig. 2;

Fig. 4 is a partial cross-sectional view of Fig. 3 after assembly;

Fig. 5 is a schematic diagram of the assembly of the medium and low pressure fuel tank and the switch assembly in Fig. 3;

Fig. 6 is an exploded schematic view of the pressure regulating reversing valve in Fig. 1;

Fig. 7 is a schematic structural view of the sealing cover in Fig. 6;

Fig. 8 is a schematic structural view of the spool in Fig. 6;

Fig. 9 is a schematic structural view of the valve sleeve housing in Fig. 6;

Fig. 10 is a schematic structural view of the hydraulic pipe connection assembly in Fig. 1;

Fig. 11 is a schematic diagram of the assembly of the drive mechanism and the low-pressure oil tank in Fig. 1;

Fig. 12 is an exploded schematic diagram of Fig. 11;

Fig. 13 is a schematic structural view of the sealing cover in Fig. 11;

Fig. 14 is an exploded schematic view of the low-pressure fuel tank and piston connecting rod assembly in Fig. 11;

Fig. 15 is a schematic structural view of the piston-driven turntable in Fig. 14;

Fig. 16 is a schematic structural diagram of the piston in Fig. 14 .

detailed description

In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described here, and those skilled in the art can make similar improvements without departing from the connotation of the present invention, so the present invention is not limited by the specific implementations disclosed below.

It should be noted that when an element is referred to as being “fixed” to another element, it can be directly on the other element or there can also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for purposes of illustration only and are not intended to represent the only embodiments.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Please refer to FIG. 1 and FIG. 2 , which are a central hydraulic pump 10 in an embodiment, which can realize relatively independent control of multiple hydraulic devices (not shown) by one central hydraulic pump 10 . The central hydraulic pump 10 includes a support base 110 , a high-pressure oil tank 200 , a low-pressure oil tank 300 , a switch assembly 400 , a plurality of pressure regulating reversing valves 500 , a hydraulic pipe connecting assembly 600 and a driving mechanism 700 .

The support base 110 is roughly circular in shape, and the support base 110 is mainly used for supporting and fixing. The high-pressure fuel tank 200 and the pressure-regulating reversing valve 500 are arranged on the support seat 110 . Specifically, a receiving groove (not shown) may be provided in the middle of the support seat 110, and the high-pressure fuel tank 200 and the pressure regulating reversing valve 500 are arranged in the receiving groove (not shown). The support base 110 is also provided with a positioning hole 111 , and an external fastener is passed through the positioning hole 111 to fix the central hydraulic pump 10 on an external object (such as a chassis). The external fasteners may be fasteners such as screws or bolts, such as hexagonal screws.

Specifically, in this embodiment, a cover 120 is further included. The cover 120 is covered on the support base 110 , and the cover 120 and the support base 110 jointly form a receiving space 130 . The high-pressure oil tank 200 , the low-pressure oil tank 300 , the switch assembly 400 , a plurality of pressure regulating and reversing valves 500 and the driving mechanism 700 are all accommodated in the accommodation space 130 . Protruding pillars 121 are disposed on the end surface of the cover 120 , and holes 112 matching the protruding pillars 121 are defined on the edge surface of the support base 110 , so as to cover the cover 120 firmly on the support base 110 .

Please refer to FIG. 3 and FIG. 4 together, the high-pressure oil tank 200 is disposed on the support base 110 . The high-pressure oil tank 200 is an integral stamping structure, and the interior can bear relatively high pressure. A plurality of high-pressure oil outlet holes 210 arranged at intervals are opened on the side wall of the high-pressure oil tank 200 , and the hydraulic oil in the high-pressure oil tank 200 is output through the high-pressure oil outlet holes 210 . The top of the high-pressure fuel tank 200 is also provided with a first through hole 220 for inserting one end of the low-pressure fuel tank 300 . The first through-hole 220 is also provided with internal threads. The outer surface of the high-pressure oil tank 200 is also provided with a plurality of cooling grooves 230, and the plurality of cooling grooves 230 are arranged at intervals. The heat dissipation groove 230 provided can increase the heat dissipation area and improve the heat dissipation efficiency of the high pressure oil tank 200 . Specifically, each high-pressure oil outlet hole 210 is located between two adjacent cooling grooves 230 , and the outer surface 240 of the high-pressure oil tank 200 provided with the high-pressure oil outlet hole 210 is a plane to coincide highly with the hydraulic pipe connection assembly 600 .

Please also refer to FIG. 5 , the low-pressure oil tank 300 is roughly in the shape of a cylinder. The material of the inner wall of the low-pressure fuel tank 300 can be steel, which has wear resistance, or other materials with wear resistance. The shell material of the low-pressure fuel tank 300 can be aluminum alloy, so as to facilitate the heat dissipation of the low-pressure fuel tank 300 . The low-pressure oil tank 300 has a first end 310 and a second end 320 , and the first end 310 is inserted into the high-pressure oil tank 200 through the first through hole 220 . The side wall of the first end 310 of the low-pressure fuel tank 300 inserted into the high-pressure fuel tank 200 is provided with an external thread, and the external thread is screwed with the internal thread provided in the first through hole 220 of the high-pressure fuel tank 200 to realize the connection between the high-pressure fuel tank 200 and the low-pressure fuel tank 200. The fuel tanks 300 are screwed together, the assembly is simple and the low-pressure fuel tank 300 is not easy to separate from the high-pressure fuel tank 200 . A second through hole 311 is opened at the end of the first end 310 , and the hydraulic oil in the low pressure oil tank 300 enters into the high pressure oil tank 200 through the second through hole 311 . A partition 330 is also provided in the low-pressure fuel tank 300, and the partition 330 is located between the first end 310 and the second end 320. The partition 330 is provided with a third through hole (not shown in the figure), and the switch assembly 400 controls the third through hole. opening or closing of vias.

Specifically in this embodiment, a low pressure oil return hole 340 is opened on the side wall of the low pressure oil tank 300 . There are multiple low-pressure oil return holes 340 , and the plurality of low-pressure oil return holes 340 are distributed on the side wall at intervals. The outer surface 350 of the low-pressure oil tank 300 provided with the low-pressure oil return hole 340 is a plane, so as to match the height of the hydraulic pipe connection assembly 600 . Specifically, the hydraulic pipe connection assembly 600 and the low-pressure oil return hole 340 can also be connected through the return conduit 360 , one end of the return conduit 360 communicates with the low-pressure oil return hole 340 , and the other end communicates with the hydraulic pipe connection assembly 600 .

Specifically in this embodiment, the first end 310 of the low-pressure oil tank 300 inserted into the high-pressure oil tank 200 has a tapered structure, forming a shape similar to a funnel, which is conducive to guiding the hydraulic oil in the low-pressure oil tank 300 to enter the high-pressure oil tank 200 smoothly and evenly. A stepped structure 370 is also formed on the outer surface of the low-pressure oil tank 300 , and the stepped structure 370 abuts against the top of the high-pressure oil tank 200 to prevent the low-pressure oil tank 300 from being fully inserted into the high-pressure oil tank 200 .

Please also refer to FIG. 13 , the end of the second end 320 of the low-pressure oil tank 300 is also provided with a sealing cover 380 , and the sealing cover 380 is used to form a receiving chamber with the low-pressure oil tank 300 (not shown). Specifically, a threaded hole (not shown) may be provided on the sealing cover 380, and a threaded hole 321 may be provided at the end of the second end 320 of the low-pressure oil tank 300, and then the sealing cover 380 shall be covered by fastening screws 390 on the The second end 320 of the low pressure oil tank 300 . The end surface of the sealing cover 380 is also provided with a first semicircular shaft hole 381, and the end of the second end 320 is also provided with a second semicircular shaft hole 322, and the first semicircular shaft hole 381 and the second semicircular shaft hole 322 are formed in cooperation. Circular shaft hole. Specifically, cooling grooves (not shown) may also be provided on the outer side walls of the sealing cover 380 and the low-pressure oil tank 300 to increase the cooling area and improve the cooling efficiency.

Please also refer to FIG. 5 , the switch assembly 400 includes an elastically disposed isolation top core 420 , and the isolation top core 420 can open or close the third through hole. Specifically, the switch assembly 400 includes a telescopic spring 410 , an isolation top core 420 and a positioning screw ring 430 . One end of the telescopic spring 410 is disposed on the first end 310 of the low pressure oil tank 300 and on the wall of the second through hole 311 . Specifically, the telescopic spring 410 may be fixedly disposed on the hole wall of the second through hole 311 . For example, the hole wall of the second through hole 311 of the low-pressure oil tank 300 extends into the hole to form a positioning protrusion ring, and the telescopic spring 410 is fixedly arranged on the positioning protrusion ring. The positioning screw ring 430 is arranged on the hole wall of the third through hole (not shown in the figure), and the function of the positioning screw ring 430 is to terminate the upward stroke of the isolation top core 420 and lock the isolation top core 420 . Of course, in other embodiments, the positioning screw ring 430 can also be omitted.

The spacer core 420 is disposed on the other end of the telescopic spring 410 and can open or close the third through hole (not shown). When the oil in the low-pressure oil tank 300 is pressed into the high-pressure oil tank 200, the hydraulic oil exerts pressure on the isolation top core 420, the isolation top core 420 forces the telescopic spring 410 to be compressed, the third through hole (not shown) is opened, and the hydraulic oil Enter the high pressure oil tank 200 from the low pressure oil tank 300 through the third through hole and the second through hole 311 in sequence. When the hydraulic oil has completely entered the high-pressure oil tank 200, the static pressure in the high-pressure oil tank 200 is greater than the static pressure in the low-pressure oil tank 300, and the isolation top core 420 recovers under the joint force of the telescopic spring 410 and the hydraulic oil in the high-pressure oil tank 200. Closing the third through hole prevents the hydraulic oil inside the high-pressure oil tank 200 from flowing back into the low-pressure oil tank 300 .

Please refer to FIG. 6 to FIG. 9 together, a plurality of pressure regulating reversing valves 500 are disposed on the support seat 110 at intervals. Specifically, each pressure regulating reversing valve 500 includes a motor 510 , a sealing cover 520 , a valve core 530 and a valve sleeve housing 540 . The motor 510 is a high-precision servo motor, and the motor 510 can drive the valve core 530 to rotate in the valve sleeve housing 540 . The sealing cover 520 is disposed on the valve sleeve housing 540 , and the sealing cover 520 and the valve sleeve housing 540 form a closed space, and the valve core 530 is accommodated in the closed space. Specifically, the sealing cover 520 is covered on the valve sleeve housing 540 by fastening screws 550 . For example, a threaded hole 521 can be provided on the sealing cover 520, a threaded hole 541 can be provided on the valve sleeve housing 540, and then the fastening screws 550 can be threaded in the two threaded holes in sequence to cover the sealing cover 520 on the valve. on the casing 540.

Specifically, a step 542 can also be provided on the valve sleeve housing 540, and a boss 523 is provided on the side of the sealing cover 520 facing the valve housing housing 540, and the boss 523 abuts against the step 542 to prevent the sealing cover 520 from extending into Inside the valve sleeve housing 540 . A locking groove 543 is defined on the side wall of the step 542 , and a buckle 524 is disposed on the side wall of the boss 523 , and the buckle 524 is locked into the locking groove 543 . The locking groove 543 includes a guiding groove 5431 and a locking groove 5432. The guiding groove 5431 and the locking groove 5432 are arranged at an angle, for example, they are arranged at a right angle in this embodiment. Of course, it can also be set at an acute angle, so as to buckle the buckle 524 and prevent the buckle 524 from coming out easily. The buckle 524 enters into the locking groove 5432 through the guiding groove 5431 to lock the protrusion 523 .

A first channel 531 and a second channel 532 communicating with each other are opened on the side wall of the valve core 530 , the first channel 531 and the second channel 532 are used for hydraulic oil to pass through, and the first channel 531 and the second channel 532 are L-shaped. A positioning groove 533 is defined on the side wall of the valve core 530, and the positioning groove 533 is spaced apart from the first passage 531 and the second passage 532, that is, the positioning groove 533 is not connected to the first passage 531 and the second through hole. The positioning slot 533 accommodates a resilient positioning top core 536 . Specifically, a positioning ring 534, a positioning spring 535 and a positioning top core 536 are accommodated. The two ends of the positioning spring 535 are respectively connected to the positioning top core 536 and the positioning ring 534. Of course, in other implementation manners, the positioning ring 534 can also be omitted, and the positioning spring 535 is directly disposed at the bottom of the positioning groove 533 . The positioning groove 533 on the spool 530 is a one-way closed circuit, so even if the positioning spring 535 is not enough to press the positioning top core 536, the hydraulic oil can no longer flow after reaching the closed circuit.

A high-pressure input nozzle 544 , a high-pressure output nozzle 545 and a decompression return nozzle 546 are arranged at intervals on the side wall of the valve sleeve housing 540 . The high-pressure input nozzle 544 communicates with the high-pressure oil outlet 210 , for example, it may directly communicate with the high-pressure oil outlet 210 . The high-pressure output nozzle 545 is used to communicate with the hydraulic device, for example, it can communicate with the hydraulic device through the hydraulic pipe connection assembly 600 . The decompression return pipe port 546 communicates with the low pressure oil return hole 340 . For example, the hydraulic pipe connection assembly 600 may communicate with the low-pressure oil return hole 340 . The inner side wall of the valve sleeve housing 540 is also provided with a travel slot 547 , and the positioning top core 536 can be snapped into the travel slot 547 .

When the central hydraulic pump 10 is in the working state, the hydraulic oil is pressed from the low-pressure oil tank 300 into the high-pressure oil tank 200, and then enters the pressure-regulating reversing valve 500 from the high-pressure oil outlet hole 210 of the high-pressure oil tank 200 through the high-pressure input nozzle 544, and then The high pressure output nozzle 545 is input into the hydraulic device. When a sensor on a hydraulic device link returns a value exceeding the upper and lower limits, the motor 510 drives the spool 530 of the pressure regulating reversing valve 500 connected to the hydraulic device to rotate, so that the spool 530 is relatively adjusted to the high pressure input. The position of the nozzle 544, the high-pressure output nozzle 545 or the decompression return nozzle 546 can then adjust the flow direction of the hydraulic oil, while the pressure regulating reversing valve 500 on the link of other hydraulic devices is not affected.

For example, when the sensor feedback of a hydraulic device on a certain link needs to be pressurized, the motor 510 drives the spool 530 of the pressure regulating reversing valve 500 connected to the hydraulic device to rotate, so that the first passage 531 of the spool 530 and the The high-pressure input nozzle 544 of the valve sleeve housing 540 is docked, and the second channel 532 is connected to the high-pressure output nozzle 545, so that the hydraulic oil is continuously passed from the high-pressure oil tank 200 through the high-pressure input nozzle 544, the second channel 532, the first Passage 531 and high pressure output nozzle 545 enter the hydraulic device. At this time, the decompression return pipe port 546 is closed by the positioning core 536 and is in a closed state.

When the sensor feedback of the hydraulic device on a certain link needs to be decompressed, the motor 510 drives the spool 530 of the pressure regulating reversing valve 500 to rotate, so that the second channel 532 of the spool 530 and the high pressure of the valve sleeve housing 540 The output nozzle 545 is docked, and the first channel 531 is connected to the decompression return nozzle 546. Under the action of the low-pressure oil tank 300, the hydraulic oil flows from the hydraulic device through the high-pressure output nozzle 545, the second channel 532, and the first channel 531. And the decompression return pipe port 546 is sucked into the low-pressure fuel tank 300 and then pressed into the high-pressure fuel tank 200 for redistribution. At this time, the positioning top core 536 is in the stroke slot 547 of the valve sleeve housing 540, and the high-pressure input nozzle 544 is closed by the outer wall of the valve core 530, and the lock is in a closed state.

When the locomotive needs to be parked, the motor 510 will rotate the spool 530 to a state where the high-pressure input nozzle 544, the high-pressure output nozzle 545 and the decompression return nozzle 546 are all closed. For example, the positioning top core 536 is docked with the high-pressure output nozzle 545 to prevent hydraulic oil from entering the hydraulic device. The first channel 531 is connected to the decompression return nozzle 546 , and the second channel 532 is connected to the stroke slot 547 . The high-pressure output pipe port 545 is docked with the solid side wall of the valve core 530 .

In practical applications, the motor will be controlled to respond in milliseconds according to the numerical signal sent by the sensor on the link of the hydraulic device, thereby adjusting the rotation of the spool 530 in the valve sleeve housing 540 to achieve stepless speed regulation and regulation. , on or off, and precisely control the flow and direction of each hydraulic oil.

Please also refer to FIG. 10 , which also includes a plurality of hydraulic pipe connection assemblies 600. The hydraulic pipe connection assemblies 600 can be used to connect the high-pressure output nozzle 545 of each pressure regulating reversing valve 500 with each hydraulic device, and to connect to the low pressure. The low-pressure oil return hole 340 of the oil tank 300 and the decompression return pipe port 546 of the pressure regulating reversing valve 500 can also be used to connect the high-pressure oil outlet hole 210 and the high-pressure input pipe port 544 .

Each hydraulic pipe connection assembly 600 includes an elbow joint 610 , a nut 620 , a middle joint 630 and an emptying and filling screw 640 . The elbow joint 610 is roughly L-shaped, and two ends of the elbow joint 610 are provided with nuts 620 . The nut 620 is an embedded movable fastener, which is loosely buckled at both ends of the elbow joint 610, and can be rotated 360°, and is used to tighten the middle joint 630 and the connecting parts such as hydraulic conduits. The emptying and filling screw 640 is arranged at the corner of the elbow joint 610, and is used for maintenance measures such as overhauling the hydraulic pipe connection assembly 600, performing air evacuation, adding hydraulic oil, etc., to ensure the normal operation of the hydraulic device.

The above-mentioned high pressure oil tank 200, low pressure oil tank 300, switch assembly 400 and pressure regulating reversing valve 500 can form a hydraulic oil circulation system. The hydraulic oil circulation system may also include a hydraulic hose connection assembly 600 . The hydraulic oil circulation system makes the hydraulic oil of various hydraulic devices return to the low-pressure oil tank 300 through the decompression return pipe 546, and then is uniformly re-pressed into the high-pressure oil tank 200 for circulation and continuous distribution, so that one hydraulic oil circulation system can correspond to multiple The hydraulic components located on different links are not only conducive to optimizing the structural design, but also improve the integration of the hydraulic oil circulation system.

Please refer to FIG. 11 to FIG. 16 together. The driving mechanism 700 mainly provides power for the central hydraulic pump 10 to drive the piston 740 to reciprocate along the low-pressure oil tank 300 to press the hydraulic oil in the low-pressure oil tank 300 into the high-pressure oil tank 200 . The driving mechanism 700 includes a power source, a transmission assembly 720 , a piston connecting rod assembly 730 and a piston 740 . Specifically, in this embodiment, the power source may be a unidirectional drive motor 710, and the unidirectional drive motor 710 can rotate at a constant speed with a high torque and low rotation under a regulated power supply. The motor shaft 711 of the one-way driving motor 710 can be a hexagonal shaft, and the one-way driving motor 710 drives the hexagonal shaft to rotate in one direction.

Specifically, the driving mechanism 700 drives the piston 740 to reciprocate along the low pressure oil tank 300 through the transmission assembly 720 and the piston connecting rod assembly 730 . The transmission assembly 720 includes a first screw 721 , a first transmission gear 722 , a second screw 723 and a second transmission gear 724 . The first screw 721 is sheathed on the motor shaft 711 of the one-way driving motor 710 , and the first screw 721 is a screw matched with the motor shaft 711 . The first screw 721 is a hollow screw, and the hollow screw is sheathed on the motor shaft 711 . Specifically, a positioning screw 7211 can also be provided at the end of the first screw rod 721 , so as to firmly sleeve the first screw rod 721 on the motor shaft 711 . The first transmission gear 722 meshes with the first screw rod 721, and the first transmission gear 722 is sleeved on the second screw rod 723, so that the first transmission gear 722 and the second screw rod 723 rotate coaxially, and the second transmission gear 724 and the second screw rod 723 rotate coaxially. The two screws 723 are meshed to form a two-stage gear/screw linkage structure.

Since the driving mechanism 700 adopts a two-stage gear/screw linkage structure, and the power source is a one-way driving motor 710, under any circumstances, the entire driving mechanism 700 is in an irreversible state, which effectively prevents recoil caused by excessive internal pressure. The danger of causing the retrograde movement of mechanical parts and causing the collapse of other related systems. Specifically, a positioning nut 7221 can also be provided to prevent the first transmission gear 722 from falling off from the second screw rod 723 .

Specifically, a fixed bracket 725 may also be provided, and the fixed bracket 725 is used to support the power source, the first screw 721 , the second screw 723 and other components. The fixing bracket 725 has two half brackets 7251 that cooperate with each other. Each half bracket 7251 has an arc-shaped side 7252 . A threaded hole 7253 is provided on one half of the bracket 7251 , and a threaded fastener 7254 is used to pass through the threaded hole 7253 to install the one-way driving motor 710 on the fixed bracket 725 . The second screw rod 723 is threaded on the fixing bracket 725 , and the ends of the second screw rod 723 are respectively provided with thread sleeves 7231 , so that the second screw rod 723 is stably threaded on the fixing bracket 725 .

The piston connecting rod assembly 730 includes a piston driving turntable 731 , a piston connecting rod 732 and a connecting rod base 733 . There are two piston-driven turntables 731, and the two piston-driven turntables 731 are connected by turntable pins 7311. Each of the piston-driven turntables 731 is provided with a plurality of through holes, and the turntable pins 7311 are disposed in two opposite through holes to connect the two piston-driven turntables 731 . Each piston-driven turntable 731 is also provided with a turntable shaft 7312 , and the turntable shaft 7312 protrudes from the low-pressure oil tank 300 . Specifically, the turntable shaft 7312 protrudes from the low-pressure oil tank 300 through the circular shaft hole formed by the second semi-circular shaft hole 322 on the low-pressure oil tank 300 and the first semi-circular shaft hole 381 on the sealing cover 380 . The second transmission gear 724 is sleeved on one end of the turntable shaft 7312 protruding from the low-pressure oil tank 300 .

One end of the piston connecting rod 732 is arranged on the turntable pin 7311 , and the other end is connected with the piston 740 . The connecting rod base 733 is disposed on the piston 740 . Specifically in this embodiment, the other end of the piston connecting rod 732 is connected to the piston 740 through the connecting rod base 733 . One end of the piston connecting rod 732 is provided with a through hole, and the turntable pin 7311 passes through the through hole, so that the piston connecting rod 732 moves with the rotation of the piston driving the turntable 731 . The other end of the piston connecting rod 732 is provided with a through hole, and two spaced lugs are formed on the connecting rod base 733. Through holes are provided on the lugs, and then a connecting rod bolt (male) and a connecting rod bolt (female) are connected to each other. ) in turn through the through hole arranged in the piston connecting rod and the through hole on the lug to match, the piston connecting rod 732 can be connected with the connecting rod base 733.

A pressure accumulation basin 741 is formed at the bottom of the piston 740 , and the hydraulic oil in the low-pressure oil tank 300 presses the isolation top core 420 under the action of the pressure accumulation basin 741 . The bottom end of the piston 740 is also provided with a drainage notch 742. When the piston 740 moves upward in the low-pressure oil tank 300, a vacuum and low-pressure area will be formed in the low-pressure oil tank 300, and the hydraulic oil from the decompression return pipe port 546 will flow from the piston. The drainage notch 742 is sucked into the low-pressure oil tank 300 by the vacuum low-pressure area. Specifically, the number of drainage notches 742 may be multiple, and the plurality of drainage notches 742 are distributed at the bottom end of the piston 740 at intervals. The diameter of the drainage notch 742 can be equal to the diameter of the low-pressure oil return hole 340, so that when the piston 740 just moves to the end of the upward stroke of the low-pressure oil tank 300, the hydraulic oil just enters the low-pressure oil tank 300 from the drainage notch 742.

When the piston 740 moves downward, the drainage notch 742 cuts down from the inner wall of the low-pressure oil tank 300 in a vertical section, and the hydraulic oil cannot flow back into the decompression return pipe port 546 at this time. Under the centripetal force of the pressure accumulating basin 740 at the bottom of the piston, the hydraulic oil is evenly pushed downward. Because the torque generated by the one-way driving motor 710 driving the piston 740 is greater than the pressure inside the low-pressure oil tank 300 and the inside of the high-pressure oil tank 200, the hydraulic oil forcibly forces the isolation top core 420 to compress the telescopic spring 410 to retract backward, so that the hydraulic oil can be moved from the first The three through holes enter the high pressure oil tank 200 through the second through hole 311 .

An annular groove 743 is also defined on the side wall of the piston 740 . There are multiple annular grooves 743 , and the plurality of annular grooves 743 are arranged at intervals along the axial direction of the piston 740 . The purpose of setting the annular groove 743 is to sleeve the sealing ring, and the sealing ring is used to ensure the tightness between the piston 740 and the low-pressure oil tank 300 . The top of the piston 740 is also provided with an avoidance groove 744 , and the piston driving turntable 731 , the piston connecting rod 732 and the connecting rod base 733 are all accommodated in the avoidance groove 744 . When the piston drives the turntable 731 to drive the piston connecting rod 732 to make a curved movement, the piston 740 makes a linear reciprocating motion under the action of the piston connecting rod 732 . When the piston 740 moves to the upper end (ie, the second end) of the low-pressure oil tank 300 , the escape groove 744 at the top of the piston 740 allows the piston to drive the turntable 731 to pass through to continue the next cycle.

The above-mentioned central hydraulic pump 10 has at least the following advantages:

The one-way driving motor 710 drives the piston 740 to move upward, and the hydraulic oil in the hydraulic device flows back into the low-pressure oil tank 300 through the pressure regulating reversing valve 500; the one-way driving motor 710 drives the piston 740 to move downward, and the hydraulic oil in the low-pressure oil tank 300 Force the isolation top core 420 to compress the telescopic spring 410, and the hydraulic oil in the low-pressure fuel tank 300 enters the high-pressure fuel tank 200 through the third through hole and the second through hole 311. The top core 420 closes the third through hole, and the hydraulic oil in the high-pressure oil tank 200 is input into the hydraulic device through the pressure regulating reversing valve 500 . The side wall of the high-pressure oil tank 200 is provided with a plurality of high-pressure oil outlet holes 210 arranged at intervals, and the side wall of the low-pressure oil tank 300 is provided with a plurality of interval-arranged low-pressure oil return holes 340, and a plurality of pressure regulation and reversing holes are also provided. Valve 500, the high-pressure input pipe port 544 of each pressure-regulating reversing valve 500 is connected with the high-pressure oil outlet hole 210, the high-pressure output pipe port 545 is connected with the hydraulic device, and the decompression return pipe port 546 is connected with the low-pressure oil return port. 340 are connected, and each pressure regulating reversing valve 500 corresponds to a hydraulic device. According to the pressure required by different hydraulic devices, the motor drives the valve core 530 to rotate in the valve sleeve housing 540, changing the first channel 531 and the second channel. 532 and the relative position of the high-pressure input nozzle 544, the high-pressure output nozzle 545 and the decompression return nozzle 546 on the valve sleeve housing 540 allow or prevent the hydraulic oil from the high-pressure oil tank 200 from entering the hydraulic device, and the hydraulic oil from the hydraulic pressure The device returns to the low-pressure oil tank 300, so that a central hydraulic pump 10 can be used to relatively independently control the actions of multiple hydraulic devices with different functions, which reduces the difficulty of installation, debugging, maintenance, and improves the long-term operation of the device. Effectiveness, safety and longevity.

Specifically in this embodiment, the central hydraulic pump 10 can be applied to digital locomotives. There are 12 low-pressure oil return holes 340 on the low-pressure oil tank 300 of the central hydraulic pump 10, and 12 high-pressure oil outlets on the high-pressure oil tank 200. Holes 210 are provided with 12 pressure regulating reversing valves 500 to form 12 single circuits, which control 16 mutually independent hydraulic devices in groups.

Among them, the 1st to 8th circuits are single-channel single-control, which are used to independently control 8 hydraulic devices in different positions in the suspension system. The 9th channel is a single-channel group control, which is used to control the synchronous operation of the two hydraulic devices of the locomotive cabin door, and perform functions such as door opening/closing and angle adjustment as required. The 10th channel is a single-channel group control, which is used to control the synchronous operation of the two hydraulic devices of the safety protection bar of the driver's seat, and performs the mandatory safety protection function for the driver.

The 11th road is a single-way group control, which is used to control the synchronous operation of the two hydraulic components of the locomotive brake. In addition to the deceleration that cannot be implemented by various energy recovery, the emergency braking function is performed on demand. The 12th channel is a single-channel group control, which is used to control the synchronous operation of the two hydraulic devices of the front-end guard bar of the locomotive, and realize the automatic control and variable function of the entry angle of the locomotive. Of course, in actual operation, the single-channel setting can be increased or decreased according to the different vehicle models and functional requirements, so as to reduce the power consumption of the whole vehicle and save the cost of parts.

The above-mentioned embodiments only express several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but should not be construed as limiting the patent scope of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (10)

1. a hydraulic oil blood circulation, it is characterised in that including:

Pressure-oil tank, the sidewall of described pressure-oil tank offers multiple high pressure oil outlet, and the top of described pressure-oil tank offers the first through hole；

Low-pressure reservoir, there is the first end and the second end, described first end is inserted in described pressure-oil tank by described first through hole, the end opens of described first end has the second through hole, it is additionally provided with dividing plate in described low-pressure reservoir, described dividing plate, between described first end and described second end, described dividing plate offers third through-hole, the sidewall of described low-pressure reservoir offers multiple low pressure oil and feeds back hole；

Switch module, including coil tension spring and isolation plunger tip, one end of described coil tension spring is arranged at described first end and is positioned on the hole wall of described second through hole, and described isolation plunger tip is arranged at the other end of described coil tension spring and can be turned on and off described third through-hole；And

Multiple pressure regulation reversal valves, each pressure regulation reversal valve includes motor, spool and valve pocket housing, described motor can drive described spool to rotate in described valve core shell body, the sidewall of described spool offers the first passage being interconnected and second channel, the sidewall of described spool is further opened with locating slot, described locating slot and described first passage and described second channel interval are arranged, location spring and location plunger tip is contained in described locating slot, the sidewall of described valve pocket housing is arranged at intervals with the high input voltage mouth of pipe, the High voltage output mouth of pipe and decompression feed back the mouth of pipe, the described high input voltage mouth of pipe is connected with described high pressure oil outlet, the described High voltage output mouth of pipe is for being connected with hydraulic component, described decompression feeds back the mouth of pipe and is connected with described low pressure oil feedback hole.

2. hydraulic oil blood circulation according to claim 1, it is characterised in that also including hydraulic tube connecting assembly, described hydraulic tube connecting assembly includes bent sub and nut, and described nut is arranged at the two ends of described bent sub.

3. hydraulic oil blood circulation according to claim 1, it is characterised in that be provided with multiple heat radiation groove on the outer surface of described pressure-oil tank, the plurality of heat radiation groove interval is arranged, and it is plane that described pressure-oil tank offers the outer surface of high pressure oil outlet.

4. hydraulic oil blood circulation according to claim 1, it is characterized in that, the sidewall of the first end that described low-pressure reservoir is inserted in described pressure-oil tank is provided with external screw thread, is provided with female thread in the first through hole of described pressure-oil tank, and described pressure-oil tank and described low-pressure reservoir are screwed.

5. hydraulic oil blood circulation according to claim 1, it is characterised in that it is taper that described low-pressure reservoir inserts the first end of described pressure-oil tank, and the outer surface of described low-pressure reservoir is formed with ledge structure.

6. hydraulic oil blood circulation according to claim 1, it is characterised in that be additionally provided with closing cap, is covered on described second end by trip bolt by described closing cap, and described closing cap and described low-pressure reservoir surround a collecting chamber.

7. hydraulic oil blood circulation according to claim 1, it is characterised in that described pressure regulation reversal valve also includes sealing lid, and described sealing lid is covered on described valve pocket housing.

8. hydraulic oil blood circulation according to claim 7, it is characterised in that be additionally provided with ladder on described valve pocket housing, the one side of described valve pocket housing is provided with boss by described sealing capping, and described boss and described ladder abut against.

9. hydraulic oil blood circulation according to claim 8, it is characterized in that, the sidewall of described ladder offers draw-in groove, the sidewall of described boss is provided with buckle, described buckle snaps in described draw-in groove, being further opened with stroke draw-in groove on the medial wall of described valve pocket housing, described location plunger tip can snap in described stroke draw-in groove.

10. a central hydraulic pump, it is characterised in that including:

Supporting seat；

Hydraulic oil blood circulation as in one of claimed in any of claims 1 to 9；And

Piston, described piston reciprocatingly moves in described low-pressure reservoir, the hydraulic oil in described low-pressure reservoir is made to force described isolation plunger tip to oppress the compression of described coil tension spring, thus opening third through-hole, hydraulic oil is pressed in described pressure-oil tank via described third through-hole and described second through hole from described low-pressure reservoir successively, the bottom of described piston offers drain recess, and it is corresponding that described drain recess feeds back the mouth of pipe with described decompression.