An emergency pump front-end multi-circuit capacity expansion device

Abstract

The application discloses an emergency pump front-end multi-circuit capacity expansion device and belongs to the technical field of hydraulic control. The application comprises a base, wherein a multi-stage jacking oil cylinder control valve, a horizontal moving oil cylinder control valve, a righting oil cylinder control valve, a large machine oil cylinder control valve and a power distribution valve are installed on the base; a supercharger is installed in the base; the multi-stage jacking oil cylinder control valve is connected with a jacking oil cylinder, the horizontal moving oil cylinder control valve is connected with a horizontal moving oil cylinder, the righting oil cylinder control valve is connected with a righting oil cylinder, the large machine oil cylinder control valve is connected with a large machine oil cylinder, and the multi-stage jacking oil cylinder control valve, the horizontal moving oil cylinder control valve, the righting oil cylinder control valve, the large machine oil cylinder control valve and the power distribution valve are all three-position four-way reversing valves. The application integrates multiple control valves on one mounting rack, then connects the multi-circuit capacity expansion device through additional pipelines, thereby eliminating the need to move the pump station and reducing the labor intensity of the staff.

Description

Technical Field

[0001] This invention belongs to the field of hydraulic control technology, and in particular relates to a multi-circuit power expansion device at the front end of an emergency pump. Background Technology

[0002] Currently, the emergency hydraulic system of large railway maintenance machinery (hereinafter referred to as "large machinery") has only one circuit, directly connected to the hydraulic system of the large machinery. When the large machinery loses power, the emergency hydraulic system is used to recover the working device. However, the existing emergency hydraulic system can only provide power when hydraulic power fails. When hydraulic components of the large machinery malfunction (e.g., hydraulic valve group jamming, hydraulic oil pipe bursting), the emergency hydraulic system cannot function properly, thus limiting the overall emergency solution. Taking the DC-32 tamping machine as an example, when the hydraulic system of the large machinery fails and the working device cannot be recovered, the on-site rescue uses a manual pump with a lifting device, which is inefficient and labor-intensive. In addition, when the large machinery derails, the on-site derailment recovery equipment is powered by a gasoline engine, but gasoline is extremely inconvenient to procure and poses a high safety risk when stored. After a derailment, the recovery hydraulic pump station needs to be manually moved, which is labor-intensive and inefficient. Therefore, there is an urgent need for a simple-to-operate and fully functional rescue device on-site. Summary of the Invention

[0003] The purpose of this invention is to provide a multi-loop expansion device for the front end of an emergency pump. By integrating multiple control valves on a mounting bracket and then connecting the multi-loop expansion device through additional pipelines, the pump station can be moved without the need for transportation, thus reducing the labor intensity of the workers.

[0004] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0005] This invention relates to a multi-circuit power expansion device for the front end of an emergency pump, comprising a base: the base has at least five mounting positions, on which a multi-stage lifting cylinder control valve, a lateral movement cylinder control valve, a centralizing cylinder control valve, a large machine cylinder control valve, and a power distribution valve are respectively installed; a booster is installed inside the base;

[0006] The power distribution valve has at least two oil outlets. One oil outlet of the power distribution valve is connected to the oil inlet of the turbocharger. The oil outlet of the turbocharger is connected to the oil inlets of the multi-stage lifting cylinder control valve, the lateral movement cylinder control valve, and the centralizing cylinder control valve through the oil distribution pipeline. The oil return ports of the multi-stage lifting cylinder control valve, the lateral movement cylinder control valve, and the centralizing cylinder control valve are connected to the oil return port of the turbocharger through the oil return pipeline. The oil return port of the main engine cylinder control valve is connected to the oil return ports of the turbocharger and the power distribution valve, respectively. The other oil outlet of the power distribution valve is connected to the oil inlet of the main engine cylinder control valve.

[0007] Furthermore, it also includes an unloading valve and a relief valve. The two ports of the unloading valve are connected to the oil distribution line and the oil return line, respectively, and the two ports of the relief valve are connected to the oil distribution line and the oil return line, respectively.

[0008] Furthermore, the multi-stage lifting cylinder control valve is externally connected to the lifting cylinder, the lateral movement cylinder control valve is externally connected to the lateral movement cylinder, the centering cylinder control valve is externally connected to the centering cylinder, and the main machine cylinder control valve is externally connected to the main machine cylinder.

[0009] Furthermore, the multi-stage lifting cylinder control valve, the lateral movement cylinder control valve, the uprighting cylinder control valve, the main engine cylinder control valve, and the power distribution valve are all three-position four-way directional valves.

[0010] Furthermore, the three-position four-way directional valve includes a valve cylinder, an end cover, and a valve core. The end cover is provided with a handle. One end of the valve cylinder has a blind hole and four oil passages. An inner reinforcing ring is provided on the lower surface of the blind hole. The valve core is fixed in the blind hole. The end cover is sleeved on the end of the valve cylinder with the blind hole. The valve core includes a stepped column. A notch is opened on the inner reinforcing ring. The gap between the valve core and the blind hole forms an annular flow channel. The oil passages and the annular flow channel are connected through the notch. A flow-blocking ring is provided on the inner fixed surface of the end cover. The flow-blocking ring fits in the annular flow channel. The flow-blocking ring is an integral part composed of an arc-shaped baffle and an inner ring. The arc length of the arc-shaped baffle is less than the arc length between the two notches. The arc length of the arc-shaped baffle is greater than the arc length of the notch. Two arc-shaped baffles are provided and are symmetrically arranged about the center line of the flow-blocking ring.

[0011] Furthermore, the stepped column includes a sealing column and a pressure relief column. The diameter of the pressure relief column is larger than that of the sealing column. A radial channel is opened on the pressure relief column, and a pressure relief valve is installed in the channel. The arc-shaped baffle has holes.

[0012] Furthermore, the pressure relief valve includes an installation cylinder and a telescopic cylinder. One end of the installation cylinder is provided with a cross-shaped connecting plate, and one end of the telescopic cylinder is fixed to the cross-shaped connecting plate. The other end of the telescopic cylinder is provided with a pressure relief plate, which is a stepped plate composed of a first pressure-bearing plate and a second pressure-bearing plate. The channel includes a rectangular hole and a circular hole, with the width of the rectangular hole being greater than the length of the circular hole. Two "L"-shaped plates are provided inside the rectangular hole. A sealing column is provided on the telescopic cylinder, with the end of the sealing column abutting against the pressure relief plate. When the telescopic cylinder is in a normal state, there is a gap between the stepped surface of the stepped plate and the hook surface of the "L"-shaped plate, and there is a gap between the stepped surface of the sealing column and the circular hole.

[0013] Furthermore, the telescopic cylinder includes an outer cylinder and an inner cylinder, and the bottom plates of the outer cylinder and the inner cylinder are connected by a spring.

[0014] Furthermore, a rotating shaft is provided inside the end cap, and the valve core is provided with mounting holes corresponding to the rotating shaft.

[0015] Furthermore, a limiting plate is provided on the edge of the end cap, and a baffle corresponding to the limiting plate is provided on the circumferential surface of the valve cylinder.

[0016] The present invention has the following beneficial effects:

[0017] This invention's emergency capacity expansion module addresses the shortcomings of existing large-scale emergency hydraulic systems in the simplest way, solving urgent and critical needs for railway bureau transportation safety. Multiple control valves are integrated onto a single mounting bracket, and then connected to a multi-circuit capacity expansion device via additional pipelines. This eliminates the need for transporting pump stations, improving on-site rescue efficiency and reducing labor intensity; it also enhances the safety factor of track maintenance machinery and reduces safety risks. The arc-shaped baffle separates four oil passages and annular flow channels into two pathways, resulting in a simple structure and easy manufacturing. A counter-pressure reduction channel is incorporated within the valve core for pressure buffering. After rotating the end cap 90°, the oil circuit is switched. Once the pressure in the oil circuit stabilizes, the opposing surfaces of the two arc-shaped baffles become isobaric surfaces, facilitating handle rotation. A pressure relief valve is installed within the valve core. When the oil circuit is connected, the sealing column and circular orifice reciprocate, providing continuous short-term pressure relief, reducing oil circuit oscillations during reversal, and extending pipeline lifespan.

[0018] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the compressive energy diffusion device;

[0021] Figure 2 This is a schematic diagram of the compressive energy diffusion device;

[0022] Figure 3 This is a schematic diagram of the internal structure of a three-position four-way directional valve.

[0023] Figure 4 This is a schematic diagram of the end cap structure;

[0024] Figure 5 This is a schematic diagram of the valve core structure;

[0025] Figure 6 This is a schematic diagram of the internal structure of the valve core.

[0026] Figure 7 This is a schematic diagram of the valve cylinder structure;

[0027] Figure 8 This is a schematic diagram of the internal structure of the valve cylinder;

[0028] Figure 9 This is a schematic diagram of the valve core and pressure relief column.

[0029] Figure 10 This is a schematic diagram of the pressure relief column.

[0030] Figure 11 This is a schematic diagram of the internal structure of the pressure relief column;

[0031] Figure 12 This is a schematic diagram of the piping for the pressure expansion device;

[0032] The attached diagram lists the components represented by each number as follows:

[0033] 1. Handle; 2. Multi-stage lifting cylinder control valve; 3. Lateral movement cylinder control valve; 4. Lateral movement cylinder control valve; 5. Base; 6. Base; 7. Main engine cylinder control valve; 8. Power distribution valve; 9. Intensifier; 10. Unloading valve; 11. Overflow valve; 12. End cap; 13. Valve core; 14. Valve cylinder; 15. Three-position four-way directional valve; 16. Pressure relief valve; 1201. Inner ring; 1202. Arc-shaped baffle; 1203. Flow-blocking ring; 1204. Handle; 1205. Hole; 1206. Rotating shaft; 1301. Stepped column; 1302. Sealing column; 1303. Pressure relief column; 1304. "L" shape Plate; 1305, Channel; 1306, Countersunk Screw Hole; 1307, Sealing Ring; 1308, Limiting Post; 1309, Circular Hole; 1310, Rectangular Hole; 1311, Mounting Hole; 1401, Blind Hole; 1402, Limiting Hole; 1403, Inner Ring; 1404, Notch; 1405, Oil Passage; 1406, Baffle; 1601, Mounting Cylinder; 1602, Cross Connecting Plate; 1603, Telescopic Cylinder; 1604, Pressure Relief Plate; 1605, First Pressure Plate; 1606, Second Pressure Plate; 1607, Sealing Post; 1608, Spring; 1609, Inner Bucket; 1610, Outer Bucket. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0036] Please see Figure 1 , 2 As shown in Figure 12, the present invention is a multi-circuit power expansion device for the front end of an emergency pump, comprising a base 5: the base 5 has at least five mounting positions, on which a multi-stage lifting cylinder control valve 2, a lateral movement cylinder control valve 3, a centralizing cylinder control valve 4, a main engine cylinder control valve 7, and a power distribution valve 8 are respectively installed; wherein, the multi-stage lifting cylinder control valve 2 is externally connected to a lifting cylinder 2A, the lateral movement cylinder control valve 3 is externally connected to a lateral movement cylinder 3A, the centralizing cylinder control valve 4 is externally connected to a centralizing cylinder 4A, and the main engine cylinder control valve 7 is externally connected to a main engine cylinder 7A; in addition, a booster 9 is installed inside the base 5.

[0037] The power distribution valve 8 has at least two oil outlets. One oil outlet of the power distribution valve 8 is connected to the oil inlet of the turbocharger 9. The oil outlet of the turbocharger 9 is connected to the oil inlets of the multi-stage lifting cylinder control valve 2, the lateral movement cylinder control valve 3, and the centralizing cylinder control valve 4 through the oil distribution pipeline. The oil return ports of the multi-stage lifting cylinder control valve 2, the lateral movement cylinder control valve 3, and the centralizing cylinder control valve 4 are connected to the oil return port of the turbocharger 9 through the oil return pipeline. The oil return port of the main engine cylinder control valve 7 is connected to the oil return ports of the turbocharger 9 and the power distribution valve 8, respectively. The other oil outlet of the power distribution valve 8 is connected to the oil inlet of the main engine cylinder control valve 7.

[0038] The multi-stage lifting cylinder control valve 2 is externally connected to the lifting cylinder 2A. The multi-stage lifting cylinder control valve 2 is a three-stage or four-stage lifting cylinder control valve, and the corresponding lifting cylinder 2A is a three-stage or four-stage lifting cylinder of the corresponding lifting cylinder control valve level. The transverse movement cylinder control valve 3 is externally connected to the transverse movement cylinder 3A. The straightening cylinder control valve 4 is externally connected to the straightening cylinder 4A. The main machine cylinder control valve 7 is externally connected to the main machine cylinder 7A.

[0039] The pressure output after boosting is 10-80MPa, which can be used as the hydraulic source for the derailment recovery equipment. It is equipped with unloading valve 10, overflow valve 11 and high-pressure reversing valve. After connecting the pressure oil, it can directly control the operation of devices or equipment that require high-pressure oil sources, such as lifting cylinder 2A, lateral cylinder 3A, and straightening cylinder 4A.

[0040] The low-pressure oil circuit pressure is the output pressure of the emergency pump, which is generally rated at 13-16 MPa (depending on the specific emergency pump model and vehicle model), and is used for the operation device of the recovery machine, etc.

[0041] The high-pressure oil circuit needs to be equipped with an overflow valve and an unloading valve. The pressure is adjustable, with a maximum pressure of 65-80 MPa (depending on the maximum input pressure of the emergency pump). It can be used for the lifting cylinder 2A, the lateral movement cylinder 3A, and the straightening cylinder 4A of the derailment recovery equipment.

[0042] The two ports of the unloading valve 10 are connected to the oil distribution pipeline and the oil return pipeline, respectively. The two ports of the overflow valve 11 are connected to the oil distribution pipeline and the oil return pipeline, respectively. The pipeline connecting the unloading valve 10, the overflow valve 11, the multi-stage lifting cylinder control valve 2, the lateral movement cylinder control valve 3, the uprighting cylinder control valve 4, the large machine cylinder control valve 7, the power distribution valve 8, and the booster 9 is installed in the base 5. A press is also installed on the pipeline. A handle 1 is provided on the base 5. A base 6 is provided at the lower end of the base 5. The pressure booster device can be placed in the box and sent to the hydraulic pump station.

[0043] When in use, the emergency pump is connected to an external diverter valve and a manifold valve. The diverter valve splits the original pressure oil port into an oil circuit and connects it to the emergency pump power expansion device. The return oil pipe of the emergency pump power expansion device is connected to the power distribution valve 8, and then the power distribution valve 8 is connected to the return oil port of the large engine cylinder 7A. The other diverter valve can also directly connect the hydraulic pressure to the return oil port of the large engine cylinder 7A through the external pipeline.

[0044] Specific examples Figure 3-11 As shown, the multi-stage lifting cylinder control valve 2, lateral movement cylinder control valve 3, uprighting cylinder control valve 4, large machine cylinder control valve 7, and power distribution valve 8 used in the above-mentioned emergency pump front-end multi-circuit expansion device are all three-position four-way directional valves 15.

[0045] The three-position four-way directional valve 15 includes a valve cylinder 14, an end cover 12, and a valve core 13. The end cover 12 is provided with a handle 1204. The three-position four-way directional valve 15 is a manual directional valve.

[0046] The valve cylinder 14 has a blind hole 1401 and four oil passages 1405 at one end. The four oil passages 1405 are arranged at a 90° angle between adjacent oil passages 1405. The return oil passage 1405 and the inlet oil passage 1405 are arranged opposite each other. The valve core 13 is fixed in the blind hole 1401. Specifically, the bottom surface of the valve core 13 is provided with a limit post 1308, which is a regular hexagonal prism. The bottom surface of the blind hole 1401 is provided with a limit hole 1402 corresponding to the limit post 1308, which is a regular hexagonal blind hole. The valve core 13 is provided with a countersunk screw hole 1306, and the bottom surface of the blind hole 1401 is provided with a screw hole. The valve core 13 is fixed in the blind hole 1401 by bolts.

[0047] The end cap 12 is provided with a rotating shaft 1206, and the valve core 13 is provided with a mounting hole 1311 corresponding to the rotating shaft 1206. The rotating shaft 1206 is rotatably fitted in the mounting hole 1311, and the end cap 12 is sleeved on the end of the valve cylinder 14 with a blind hole 1401.

[0048] The gap between the valve core 13 and the blind hole 1401 forms an annular flow channel. Specifically, the four oil passages 1405 are in an "L" shape. An inner ring 1403 is provided on the lower surface of the blind hole 1401. The inner ring 1403 reduces the diameter of the bottom of the blind hole 1401. A notch 1404 is provided on the inner ring 1403. The oil passages 1405 and the annular flow channel are connected through the notch 1404. The valve core 13 includes a stepped column 1301. The inner ring 1403 and the stepped valve core 13 make the annular flow channel a stepped annular channel.

[0049] Correspondingly, the inner fixed surface of the end cap 12 is provided with a flow-blocking ring 1203. The flow-blocking ring 1203 is fitted in the annular flow channel. The flow-blocking ring 1203 is an integral part composed of an arc-shaped baffle 1202 and an inner ring 1201. The thickness of the inner ring 1201 is greater than the thickness of the arc-shaped baffle 1202. The arc length of the arc-shaped baffle 1202 is less than the arc length between the two notches 1404. The arc length of the arc-shaped baffle 1202 is greater than the arc length of the notches 1404. Specifically, there are two arc-shaped baffles 1202, which are symmetrically arranged about the center line of the flow-blocking ring 1203.

[0050] When one arc-shaped baffle 1202 blocks one oil passage 1405, another arc-shaped baffle 1202 blocks the opposite oil passage 1405. When one arc-shaped baffle 1202 is located between one oil outlet passage 1405 and another oil inlet passage 1405, the other arc-shaped baffle 1202 is located between another oil return passage 1405 and another oil inlet passage 1405. At this time, the arc-shaped baffle 1202 separates the four oil passages 1405 and the annular flow channel into two passages. After rotating the end cover 12 by 90°, the oil passage is switched.

[0051] After the pressure in the oil circuit stabilizes, the opposing surfaces of the two arc-shaped baffles 1202 become isobaric surfaces, which facilitates the rotation of the handle 1204. Preferably, when the handle 1204 is a folding handle, it is fixed by the end of the folding handle resting against the latch of the base 6 after rotation.

[0052] Because the target object driven by the device requires a large amount of power, the pressure difference of the energy expansion device is too large. When the traditional manual three-position four-way directional valve switches the oil circuit, it will generate a "water hammer" oscillation effect, which will cause vibration inside the device and will also act on the pipeline and the device connected to the pipeline, affecting the pipeline and the device.

[0053] Furthermore, the stepped column 1301 includes a sealing column 1302 and a pressure relief column 1303. A sealing ring 1307 is provided on the non-blind hole end face of the valve core 13. The diameter of the pressure relief column 1303 is larger than the diameter of the sealing column 1302. A radial channel 1305 is opened on the pressure relief column 1303, and a pressure relief valve 16 is installed in the channel 1305. The arc-shaped baffle 1202 has a hole 1205, that is, when one arc-shaped baffle 1202 blocks one of the columns... When the oil passage 1405 is in the oil channel, another arc-shaped baffle 1202 blocks another oil passage 1405. The hydraulic oil pressure difference between the two oil passages 1405 is large. After being connected through the hole 1205, the oil pressure in smaller devices, such as the transverse cylinder, which does not have an additional external pressure difference, is first balanced and neutralized. Then, the return oil circuit or the inlet oil circuit is connected to reduce the oscillation in the pipeline. After that, the oil circuit is switched so that the transverse cylinder retracts or extends.

[0054] Specifically, the pressure relief valve 16 includes an installation cylinder 1601 and a telescopic cylinder 1603. One end of the installation cylinder 1601 is provided with a cross-shaped connecting plate 1602. One end of the telescopic cylinder 1603 is fixed to the cross-shaped connecting plate 1602, and the other end of the telescopic cylinder 1603 is provided with a pressure relief plate 1604. The pressure relief plate 1604 is a stepped plate composed of a first pressure-bearing plate 1605 and a second pressure-bearing plate 1606. The channel 1305 includes a rectangular hole 1310 and a circular hole 1309. The width of the rectangular hole 1310 is greater than the length of the circular hole 1309. Two "L"-shaped plates 1304 are provided inside the rectangular hole 1310. A sealing post 1607 is provided on the telescopic cylinder 1603, with the end of the sealing post 1607 abutting against the pressure relief plate 1604. In the normal state, there is a gap between the stepped surface of the stepped plate and the hook surface of the "L"-shaped plate 1304. The stepped surface of the sealing column 1607 and the circular hole 1309 have a gap. The telescopic cylinder 1603 includes an outer barrel 1610 and an inner barrel 1609. The bottom plates of the outer barrel 1610 and the inner barrel 1609 are connected by a spring 1608. Initially, three oil passages are formed by two "L"-shaped plates 1304. The two outer oil passages are connected to the circular hole 1309. The oil pressure in the middle oil passage is higher, which pushes the pressure relief plate 1604. The sealing column 1607 blocks the circular hole 1309. The area of ​​the outer oil passage acting on the pressure relief plate 1604 is smaller than the area of ​​the middle oil passage acting on the pressure relief plate 1604. Under the reset of the spring 1608, the pressure relief plate 1604 extends slightly outward, and the oil passage flows again to form a pressure difference. The middle oil passage continues to push the pressure relief plate 1604, reciprocating. The sealing column 1607 and the circular hole 1309 reciprocate to retract, performing continuous short-term pressure relief.

[0055] Additionally, a limiting plate is provided on the edge of the end cover 12, and a baffle 1406 corresponding to the limiting plate is provided on the circumferential surface of the valve cylinder 14. The setting of the limiting plate and the baffle 1406 avoids direct connection between the high-pressure oil inlet channel 1405 and the low-pressure oil return channel 1405.

[0056] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0057] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A multi-circuit power expansion device for the front end of an emergency pump, characterized in that, Includes a base (5): the base (5) has at least five mounting positions, on which a multi-stage lifting cylinder control valve (2), a transverse cylinder control valve (3), a straightening cylinder control valve (4), a large machine cylinder control valve (7) and a power distribution valve (8) are respectively installed. A booster (9) is installed inside the base (5); The power distribution valve (8) has at least two oil outlets. One oil outlet of the power distribution valve (8) is connected to the oil inlet of the turbocharger (9). The oil outlet of the turbocharger (9) is connected to the oil inlet of the multi-stage lifting cylinder control valve (2), the lateral movement cylinder control valve (3), and the centering cylinder control valve (4) through the oil distribution pipeline. The return oil ports of the multi-stage lifting cylinder control valve (2), the lateral movement cylinder control valve (3), and the centering cylinder control valve (4) are connected to the return oil port of the turbocharger (9) through the return oil pipeline. The return oil port of the large engine cylinder control valve (7) is connected to the return oil ports of the turbocharger (9) and the power distribution valve (8) respectively. The other oil outlet of the power distribution valve (8) is connected to the oil inlet of the large engine cylinder control valve (7). The multi-stage lifting cylinder control valve (2), the transverse cylinder control valve (3), the uprighting cylinder control valve (4), the large machine cylinder control valve (7), and the power distribution valve (8) are all three-position four-way directional valves (15). The three-position four-way directional valve (15) includes a valve cylinder (14), an end cap (12), and a valve core (13). The end cap (12) is provided with a handle (1204). One end of the valve cylinder (14) has a blind hole (1401) and four oil passages (1405). An inner reinforcing ring (1403) is provided on the lower surface of the blind hole (1401). The valve core (13) is fixed in the blind hole (1401). The end cap (12) is sleeved on the end of the valve cylinder (14) with the blind hole (1401). The valve core (13) includes a stepped column (1301). A notch (1404) is opened on the inner reinforcing ring (1403). The valve core (13) and the blind hole (1405) are connected. The gap between 401) forms an annular flow channel. The oil passage (1405) and the annular flow channel are connected by a notch (1404). The inner fixed surface of the end cap (12) is provided with a flow-blocking ring (1203). The flow-blocking ring (1203) is fitted in the annular flow channel. The flow-blocking ring (1203) is an integral piece composed of an arc-shaped baffle (1202) and an inner ring (1201). The arc length of the arc-shaped baffle (1202) is less than the arc length between the two notches (1404). The arc length of the arc-shaped baffle (1202) is greater than the arc length of the notch (1404). Two arc-shaped baffles (1202) are provided and are symmetrically arranged about the center line of the flow-blocking ring (1203).

2. The multi-circuit power expansion device for the front end of an emergency pump according to claim 1, characterized in that, It also includes an unloading valve (10) and a relief valve (11). The two ports of the unloading valve (10) are respectively connected to the oil distribution pipeline and the oil return pipeline, and the two ports of the relief valve (11) are respectively connected to the oil distribution pipeline and the oil return pipeline.

3. An emergency pump front-end multi-loop capacity expansion device according to claim 1 or 2, characterized in that, The multi-stage lifting cylinder control valve (2) is connected to the lifting cylinder (2A), the transverse cylinder control valve (3) is connected to the transverse cylinder (3A), the centering cylinder control valve (4) is connected to the centering cylinder (4A), and the large machine cylinder control valve (7) is connected to the large machine cylinder (7A).

4. The multi-circuit power expansion device for the front end of an emergency pump according to claim 3, characterized in that, The stepped column (1301) includes a sealing column (1302) and a pressure relief column (1303). The diameter of the pressure relief column (1303) is larger than that of the sealing column (1302). A channel (1305) is radially opened on the pressure relief column (1303). A pressure relief valve (16) is installed in the channel (1305). The arc-shaped baffle (1202) has a hole (1205).

5. The multi-circuit power expansion device for the front end of an emergency pump according to claim 4, characterized in that, The pressure relief valve (16) includes an installation cylinder (1601) and a telescopic cylinder (1603). One end of the installation cylinder (1601) is provided with a cross-shaped connecting plate (1602), and one end of the telescopic cylinder (1603) is fixed to the cross-shaped connecting plate (1602). The other end of the telescopic cylinder (1603) is provided with a pressure relief plate (1604), which is a stepped plate composed of a first pressure-bearing plate (1605) and a second pressure-bearing plate (1606). The channel (1305) includes a rectangular hole (1310) and a circular hole (1310). 1309), the width of the rectangular hole (1310) is greater than the length of the circular hole (1309), two "L" shaped plates (1304) are provided inside the rectangular hole (1310), a sealing column (1607) is provided on the telescopic cylinder (1603), the end of the sealing column (1607) is attached to the pressure relief plate (1604), the telescopic cylinder (1603) is in a normal state, the stepped surface of the stepped plate and the hook surface of the "L" shaped plate (1304) have a gap, and the stepped surface of the sealing column (1607) and the circular hole (1309) have a gap.

6. The multi-circuit power expansion device for the front end of an emergency pump according to claim 5, characterized in that, The telescopic cylinder (1603) includes an outer cylinder (1610) and an inner cylinder (1609), and the bottom plates of the outer cylinder (1610) and the inner cylinder (1609) are connected by a spring (1608).

7. The multi-circuit power expansion device for the front end of an emergency pump according to claim 3, characterized in that, The end cap (12) is provided with a rotating shaft (1206), and the valve core (13) is provided with a mounting hole (1311) corresponding to the rotating shaft (1206).

8. The multi-circuit power expansion device for the front end of an emergency pump according to claim 3, characterized in that, The end cap (12) is provided with a limiting plate on its edge, and the valve cylinder (14) is provided with a baffle (1406) corresponding to the limiting plate on its circumferential surface.

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