Hydraulic power unit and power system for a bridge builder

Abstract

The application relates to the field of hydraulic units, and discloses a hydraulic power device for a bridge building machine and a power system, wherein the hydraulic power device for the bridge building machine comprises a support, an oil tank and a hydraulic pump fixedly installed on the support, an overflow valve connected between the oil tank and the hydraulic pump, an oil tank oil filtering mechanism and a control valve connected to the oil tank, and a pump oil filtering mechanism connected between the hydraulic pump and the control valve; the pump oil filtering mechanism is additionally arranged between the hydraulic pump and the control valve, can filter the oil output by the hydraulic pump, and can automatically balance the oil flow capacity of the oil filtering channel according to the impurity accumulation amount without replacing the oil filtering channel; when the channel cannot be expanded after collecting a certain amount of impurities, the new oil filtering channel can be quickly switched to the oil flow path, and the oil filtering channel filled with impurities can be cleaned, so that the service life of the equipment can be greatly prolonged and the maintenance cost can be reduced.

Description

Technical Field

[0001] This invention relates to the field of hydraulic units, and more specifically, to a hydraulic power unit and power system for bridge-building machines. Background Technology

[0002] With the continuous development of railway construction and the continuous improvement of intelligent construction level, more and more railway bridge continuous beam cantilever casting adopts intelligent cantilever bridge building machine construction technology.

[0003] The continuous beam intelligent bridge-building machine consists of a load-bearing structure, a suspension system, an anchoring system, a walking system, a protection system, and an intelligent control system. The load-bearing structure is the main structural component of the bridge-building machine, bearing the entire weight of the construction equipment and the cast-in-place concrete segments. It transfers the load to the completed beam through supports and anchoring devices. After pouring, the main beam and track of the bridge-building machine automatically move forward and are fixed in place, proceeding to the construction of the next segment. This cycle continues until the cantilever pouring is complete.

[0004] The hydraulic system is the control core of the continuous beam intelligent bridge building machine. It includes the control of the walking system and the adjustment of the template, all of which require the use of a hydraulic power system for control. Currently, the core hydraulic power device of the hydraulic power system is mostly a hydraulic unit. Common hydraulic units only have an impurity filtration mechanism in the oil tank. However, during the process of the hydraulic pump delivering oil, functional friction loss will be generated, resulting in metal debris and impurities. These will flow through various components along the oil passage and then flow back to the oil tank. During this process, impurities will affect various components in the entire oil passage flow path and may cause the movement accuracy of various structural parts of the bridge building machine to be affected. Summary of the Invention

[0005] The purpose of this invention is to provide a hydraulic power device and power system for bridge building machines in order to solve the above-mentioned problems.

[0006] The present invention provides a hydraulic power unit for a bridge building machine, including a bracket, an oil tank and a hydraulic pump fixedly mounted on the bracket, an overflow valve connected between the oil tank and the hydraulic pump, an oil tank filter mechanism and a control valve connected to the oil tank, and a pump oil filter mechanism connected between the hydraulic pump and the control valve. The pump oil filter mechanism is used to filter the oil pumped by the hydraulic pump to the control valve.

[0007] The pump oil filtration mechanism includes an oil transmission component, a modular oil filtration component located inside the oil transmission component, several impurity accumulation detection components located on the modular oil filtration component, and an energy storage switching component located between the oil transmission component and the modular oil component.

[0008] The input end of the oil transfer assembly is connected to the output end of the hydraulic pump, and its output end is connected to the input end of the control valve. The spliced ​​oil filter assembly is provided with several filter channels. The two ends of the filter channel located at a set position in the oil transfer assembly are respectively connected to the input end and the output end of the oil transfer assembly to form a complete oil flow path. The impurity accumulation detection assembly is used to obtain the amount of impurities accumulated in the corresponding filter channel in the spliced ​​oil filter assembly. The energy storage switching assembly is used to switch the filter channel in the complete oil flow path.

[0009] As a further optimization of the present invention, the oil transmission assembly includes a housing, a first oil inlet pipe and a first oil outlet pipe symmetrically connected to the housing, the other end of the first oil inlet pipe being connected to the output end of the hydraulic pump, and the other end of the first oil outlet pipe being connected to the input end of the control valve.

[0010] As a further optimization of the present invention, the spliced ​​oil filtration assembly includes a multi-channel filtration assembly and several extended oil filtration assemblies disposed on the multi-channel filtration assembly, wherein the several extended oil filtration assemblies are evenly distributed on the multi-channel filtration assembly.

[0011] As a further optimization of the present invention, the multi-channel filter assembly includes a rotating shaft movably connected to the middle of the housing, a connecting rod connected to the rotating shaft, an inner ring body and an outer ring body coaxially arranged with the rotating shaft, a plurality of partition plates connected between the outer ring body and the inner ring body, and a fan-shaped filter plate disposed between two adjacent partition plates. Slider blocks are connected to both sides of the fan-shaped filter plate. The partition plates are provided with sliding grooves that cooperate with the corresponding sliders. The cross-sectional area of ​​the fan-shaped filter plate is larger than the cross-sectional area of ​​the first oil inlet pipe. A filter channel is formed between the outer ring body, the inner ring body, and two adjacent partition plates. The fan-shaped filter plate located in the corresponding filter channel is used to filter the oil flowing through the filter channel.

[0012] As a further optimization of the present invention, the extended oil filtration assembly includes a plurality of arc-shaped extended grooves disposed on the inner circular surface of the outer ring and an arc-shaped filter plate fixedly connected to the opening of the arc-shaped extended grooves. The plurality of arc-shaped extended grooves are evenly distributed and are located between two adjacent partition plates. The fan-shaped filter plate and the arc-shaped filter plate are tightly fitted together, and the arc-shaped extended grooves are connected to the corresponding filter channels.

[0013] As a further optimization of the present invention, the impurity accumulation detection component includes a telescopic bladder and a telescopic spring connected between the slider and the inner wall of the groove, a connecting channel provided in the partition plate and the outer ring body, and a pressure sensor connected to the outer circular surface of the outer ring body. The internal space of the telescopic bladder is connected to the pressure sensor through the connecting channel, and the pressure sensor is signal-connected to the control terminal.

[0014] As a further optimization of the present invention, the energy storage switching assembly includes a motor connected to the housing, a drive cylinder connected to the output shaft of the motor, a torsion spring connected between the drive cylinder and the rotating shaft, a fixed cylinder fixedly connected to the inner wall of the housing, a plurality of fixed blades fixedly connected to the inner circular surface of the fixed cylinder, and a plurality of plastic blades fixedly connected to the rotating shaft. The plurality of fixed blades are equiangularly distributed on the inner circular surface of the fixed cylinder, and the plurality of plastic blades are equiangularly distributed on the outer circular surface of the rotating shaft, and the fixed cylinder and the plastic blades can contact each other.

[0015] As a further optimization of the present invention, the oil transfer assembly is provided with an oil backflushing cleaning assembly, which is used to backflush the filter channel switched out from the complete oil flow path.

[0016] As a further optimization of the present invention, the oil backflushing cleaning assembly includes a second oil inlet pipe and a second oil outlet pipe symmetrically connected to the housing, wherein the second oil inlet pipe is located below the first oil outlet pipe and the second oil outlet pipe is located below the first oil inlet pipe.

[0017] A hydraulic power system for a bridge-building machine includes a hydraulic power unit for the bridge-building machine as described above, a plurality of oil pipelines, and a plurality of execution units. The plurality of execution units are respectively connected to the hydraulic power unit for the bridge-building machine through the plurality of oil pipelines. The execution unit includes a hydraulic cylinder and a connector connected to the output end of the hydraulic cylinder.

[0018] The beneficial effects of this invention are as follows: This invention adds a pump oil filtration mechanism between the hydraulic pump and the control valve, which can filter the oil output by the hydraulic pump. Without replacing the oil filtration channel, it continuously and automatically balances the oil flow rate of the channel according to the amount of impurities accumulated. When the channel can no longer be expanded after collecting a certain amount of impurities, a new oil filtration channel can be quickly switched to the oil flow path, and the oil filtration channel filled with impurities can be cleaned. This can greatly improve the service life of the equipment and reduce maintenance costs. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is the invention Figure 1 A partial sectional view;

[0021] Figure 3 This is a schematic diagram of the pump oil filtration mechanism of the present invention;

[0022] Figure 4 This is the invention Figure 3An enlarged view of point A in the image;

[0023] Figure 5 This is the invention Figure 3 An enlarged view of point B in the image;

[0024] Figure 6 This is the invention Figure 3 A magnified view of point C in the image;

[0025] Figure 7 This is the invention Figure 3 Sectional view at point II;

[0026] Figure 8 This is the invention Figure 7 A magnified view of point D in the image.

[0027] In the diagram: 1. Support; 2. Oil tank; 3. Hydraulic pump; 4. Oil tank filter mechanism; 5. Overflow valve; 6. Pump oil filter mechanism; 601. Housing; 602. First oil inlet pipe; 603. First oil outlet pipe; 604. Outer ring; 605. Divider plate; 606. Inner ring; 607. Fan-shaped filter plate; 608. Slide groove; 609. Slider; 610. Telescopic bladder; 611. Telescopic spring; 612. Arc-shaped expansion groove; 613. Arc-shaped filter plate; 614. Pressure sensor; 615. Motor; 616. Drive cylinder; 617. Torsion spring; 618. Rotating shaft; 619. Connecting rod; 620. Fixed cylinder; 621. Fixed blade; 622. Plastic blade; 623. Second oil inlet pipe; 624. Second oil outlet pipe; 7. Control valve. Detailed Implementation

[0028] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed merely to enable those skilled in the art to better understand and implement the subject matter described herein. Furthermore, features described in some examples may be combined in other examples.

[0029] like Figures 1-8 As shown, a hydraulic power unit for a bridge-building machine includes a bracket 1, an oil tank 2 and a hydraulic pump 3 fixedly mounted on the bracket 1, an overflow valve 5 connected between the oil tank 2 and the hydraulic pump 3, an oil tank filter mechanism 4 and a control valve 7 connected to the oil tank 2, and a pump oil filter mechanism 6 connected between the hydraulic pump 3 and the control valve 7. The pump oil filter mechanism 6 is used to filter the oil pumped by the hydraulic pump 3 to the control valve 7.

[0030] The pump oil filtration mechanism 6 includes an oil transmission component, a modular oil filtration component located inside the oil transmission component, several impurity accumulation detection components located on the modular oil filtration component, and an energy storage switching component located between the oil transmission component and the modular oil component.

[0031] The input end of the oil transmission assembly is connected to the output end of the hydraulic pump 3, and its output end is connected to the input end of the control valve 7. The spliced ​​oil filter assembly is provided with several filter channels. The two ends of the filter channel located at a set position in the oil transmission assembly are connected to the input end and the output end of the oil transmission assembly, respectively, to form a complete oil flow path. The impurity accumulation detection assembly is used to obtain the amount of impurities accumulated in the corresponding filter channel in the spliced ​​oil filter assembly. The energy storage switching assembly is used to switch the filter channel in the complete oil flow path.

[0032] It should be noted that when the hydraulic pump 3 pumps the oil from the oil tank 2 and delivers it to the control valve 7, the oil first enters from the input end of the oil transmission assembly, flows through the corresponding modular oil filter assembly, and then enters the control valve 7 from the output end of the oil transmission assembly. The control valve 7 then controls the delivery of the oil to the corresponding actuator. During this oil flow process, the modular oil filter assembly self-adjusts and filters the oil, ensuring that the flow rate and velocity remain constant. This allows impurities generated in the hydraulic pump 3 to be fully filtered, effectively preventing impurities from causing irreversible damage to the actuator and other components during subsequent oil flow. This effectively improves the overall service life of the unit by reducing damage. When one of the filter channels of the modular oil filter assembly is in the oil flow path, the amount of impurities accumulated in the filter channel can be monitored in real time by the impurity accumulation detection component. When the amount of impurities is too large and may affect the oil flow rate and flow, the modular oil filter assembly is quickly switched to the filter channel in the oil flow path by the energy storage switching component. This process must be carried out when the unit stops supplying oil. The rapid switching by the energy storage switching component can effectively reduce the backflow of impurities in the switched filter channel into the hydraulic pump 3.

[0033] In one embodiment of the present invention, such as Figure 3 As shown, the oil transmission assembly includes a housing 601, a first oil inlet pipe 602 and a first oil outlet pipe 603 symmetrically connected to the housing 601. The other end of the first oil inlet pipe 602 is connected to the output end of the hydraulic pump 3, and the other end of the first oil outlet pipe 603 is connected to the input end of the control valve 7.

[0034] It should be noted that when the hydraulic pump 3 is operating, the oil pumped from the oil tank 2 is output from the output end of the hydraulic pump 3 and flows sequentially through the first oil inlet pipe 602, one of the filter channels on the spliced ​​oil filter assembly, and the first oil outlet pipe 603 before entering the control valve 7. The control valve 7 controls the specific delivery path of the oil to control one or more actuators to work.

[0035] In one embodiment of the present invention, such as Figures 3-4 as well as Figures 6-7 As shown, the modular oil filtration assembly includes a multi-channel filtration assembly and several extended oil filtration assemblies disposed on the multi-channel filtration assembly, with the extended oil filtration assemblies evenly distributed on the multi-channel filtration assembly.

[0036] The multi-channel filter assembly includes a rotating shaft 618 movably connected to the middle of the housing 601, a connecting rod 619 connected to the rotating shaft 618, an inner ring body 606 and an outer ring body 604 coaxially arranged with the rotating shaft 618, a plurality of partition plates 605 connected between the outer ring body 604 and the inner ring body 606, and a fan-shaped filter plate 607 disposed between two adjacent partition plates 605. Slider 609s are connected to both sides of the fan-shaped filter plate 607. The partition plates 605 are provided with sliding grooves 608 that cooperate with the corresponding sliders 609. The cross-sectional area of ​​the fan-shaped filter plate 607 is larger than the cross-sectional area of ​​the first oil inlet pipe 602. A filter channel is formed between the outer ring body 604, the inner ring body 606 and the two adjacent partition plates 605. The fan-shaped filter plate 607 located in the corresponding filter channel is used to filter the oil flowing through the filter channel.

[0037] The extended oil filtration assembly includes several arc-shaped extended grooves 612 disposed on the inner circular surface of the outer ring body 604 and an arc-shaped filter plate 613 fixedly connected to the opening of the arc-shaped extended grooves 612. The several arc-shaped extended grooves 612 are evenly distributed and are located between two adjacent partition plates 605. The fan-shaped filter plate 607 is tightly fitted with the arc-shaped filter plate 613, and the arc-shaped extended grooves 612 are connected to the corresponding filter channels.

[0038] It should be noted that, as described above, when the oil is stably filtered through the spliced ​​oil filter assembly, after entering through the first inlet pipe 602, the oil flows through the filter channel formed between the outer ring body 604, the inner ring body 606, and two adjacent partition plates 605, and is fully filtered by the fan-shaped filter plate 607 located in this filter channel. The filtered impurities are located in the area between the fan-shaped filter plate 607 and the first inlet pipe 602. As the accumulation increases, the impact force of the oil on the fan-shaped filter plate 607 gradually increases. At this time, Under the impact force, the fan-shaped filter plate 607 moves continuously toward the first oil outlet pipe 603. At this time, the fan-shaped filter plate 607 moves to the area of ​​the arc-shaped filter plate 613. The oil can flow from the area of ​​the arc-shaped filter plate 613 between the fan-shaped filter plate 607 and the first oil inlet pipe 602 into the arc-shaped expansion groove 612. The oil flowing through the arc-shaped expansion groove 612 flows out from the area of ​​the arc-shaped filter plate 613 between the fan-shaped filter plate 607 and the first oil outlet pipe 603, and enters the control valve 7 from the first oil outlet pipe 603.

[0039] As the oil flow stops, the fan-shaped filter plate 607 can be reset to a certain extent under the rebound action of the impurity accumulation detection component. This allows for scraping and cleaning of the arc-shaped expansion groove 612 between the fan-shaped filter plate 607 and the first oil inlet pipe 602, thereby further improving its filtration efficiency. When the impurity accumulation detection component detects that the amount of impurities accumulated between the fan-shaped filter plate 607 and the first oil inlet pipe 602 reaches a set value during oil flow, the hydraulic pump 3 stops working, and the accumulator switching component drives the rotating shaft 618 to rotate rapidly by 90°. This switches the filter channel with excessive accumulation out of the oil flow path and switches the filter channel without impurities into the oil flow path, thereby continuing to achieve stable filtration.

[0040] In one embodiment of the present invention, such as Figure 3 As shown, the impurity accumulation detection assembly includes a telescopic bladder 610 and a telescopic spring 611 connected between the inner walls of the slider 609 and the groove 608, a connecting channel provided inside the partition plate 605 and the outer ring body 604, and a pressure sensor 614 connected to the outer circular surface of the outer ring body 604. The internal space of the telescopic bladder 610 is connected to the pressure sensor 614 through the connecting channel, and the pressure sensor 614 is connected to the control terminal signal.

[0041] It should be noted that, as mentioned above, as the fan-shaped filter plate 607 moves toward the first oil outlet pipe 603, it can drive the slider 609, which is slidably connected in the slide groove 608, to move in the same direction and at the same distance. As the slider 609 moves, the telescopic bladder 610, which is connected between the slide groove 608 and the inner wall of the telescopic bladder 610, is continuously compressed, its internal volume decreases, and the gas or liquid inside is gradually compressed, increasing the pressure component. The pressure value inside can be monitored in real time by the pressure sensor 614. When the pressure value reaches the set value, it indicates that the movement stroke of the slider 609 has reached the limit position. At this time, the energy storage switching component can drive the rotating shaft 618 to rotate rapidly by 90°, thereby realizing the switching of the filter channel.

[0042] In one embodiment of the present invention, such as Figure 3 , Figures 5-8 As shown, the energy storage switching assembly includes a motor 615 connected to the housing 601, a drive cylinder 616 connected to the output shaft end of the motor 615, a torsion spring 617 connected between the drive cylinder 616 and the rotating shaft 618, a fixed cylinder 620 fixedly connected to the inner wall of the housing 601, a plurality of fixed blades 621 fixedly connected to the inner circular surface of the fixed cylinder 620, and a plurality of plastic blades 622 fixedly connected to the rotating shaft 618. The plurality of fixed blades 621 are equiangularly distributed on the inner circular surface of the fixed cylinder 620, and the plurality of plastic blades 622 are equiangularly distributed on the outer circular surface of the rotating shaft 618, and the fixed cylinder 620 and the plastic blades 622 can contact each other.

[0043] It should be noted that when the rotating shaft 618 is driven to rotate rapidly by 90°, the motor 615 drives the drive cylinder 616 to rotate by a set angle. As the drive cylinder 616 rotates, the torsion spring 617 connected between the drive cylinder 616 and the rotating shaft 618 applies a rotational torque to the rotating shaft 618. However, at this time, under the limiting action of the plastic blade 622 and the fixed blade 621, the rotating shaft 618 stabilizes when the torque generated by the deformation of the torsion spring 617 does not produce sufficient deformation on the plastic blade 622. At a slight rotation angle, the filter channel does not switch until the torque generated by the torsion spring 617 causes the plastic blade 622 to deform sufficiently so that it slides past the corresponding fixed blade 621. At this point, the drive cylinder 616 is in a stable state, and the shaft 618 rotates rapidly by 90° under the reset and energy release action of the torsion spring 617, thereby enabling the filter channel to switch quickly. This effectively prevents impurities from being pushed back into the hydraulic pump 3 when the telescopic spring 611 resets.

[0044] In one embodiment of the present invention, such as Figure 3 As shown, the oil transfer assembly is equipped with an oil backflushing cleaning assembly, which is used to backflush the filter channel that has been switched out from the complete oil flow path.

[0045] The oil backflushing cleaning assembly includes a second oil inlet pipe 623 and a second oil outlet pipe 624 symmetrically connected to the housing 601. The second oil inlet pipe 623 is located below the first oil outlet pipe 603, and the second oil outlet pipe 624 is located below the first oil inlet pipe 602.

[0046] It should be noted that, as mentioned above, when the filter channel is switched to the state of being connected to the second oil inlet pipe 623 and the second oil outlet pipe 624, it can effectively clean the impurities in the area between the fan-shaped filter plate 607 and the second oil outlet pipe 624 by means of the resetting of the telescopic spring 611 during back flushing, thereby enabling the filter channel to be recycled.

[0047] In one embodiment of the present invention, a hydraulic power system for a bridge-building machine includes a hydraulic power unit for a bridge-building machine as described above, a plurality of oil pipelines, and a plurality of execution units. The plurality of execution units are respectively connected to the hydraulic power unit for the bridge-building machine through the plurality of oil pipelines. The execution unit includes a hydraulic cylinder and a connector connected to the output end of the hydraulic cylinder.

[0048] It should be noted that the hydraulic cylinders and other components are directly connected to the corresponding components of the bridge-building machine via connectors, such as the side formwork demolding system. The outer sliding beam is hoisted to a precise position inside the side formwork frame (generally at the side formwork's center of gravity), with the front end of the sliding beam extending a certain length beyond the end face of the outer formwork. Then, the sliding beam is properly fixed, and the outer formwork and the outer sliding beam are hoisted together. After being hoisted into place, the lower end lifting hydraulic cylinder and the lateral translation hydraulic cylinder of the outer sliding beam are installed. The above method is repeated to install the other side formwork and the outer sliding beam. The oil supply pipeline controls the extension and retraction of the hydraulic cylinders. When oil is supplied, the hydraulic cylinders extend; when oil is returned, the hydraulic cylinders retract.

[0049] The above description of this embodiment is not limited to the specific implementation described above. The specific implementation described above is merely illustrative and not restrictive. Those skilled in the art can make many other forms based on the guidance of this embodiment, all of which are within the protection scope of this embodiment.

Claims

1. A hydraulic power unit for a bridge-building machine, characterized in that, Includes a bracket (1), an oil tank (2) and a hydraulic pump (3) fixedly mounted on the bracket (1), an overflow valve (5) connected between the oil tank (2) and the hydraulic pump (3), an oil tank filter mechanism (4) and a control valve (7) connected to the oil tank (2), and a pump oil filter mechanism (6) connected between the hydraulic pump (3) and the control valve (7), wherein the pump oil filter mechanism (6) is used to filter the oil pumped by the hydraulic pump (3) to the control valve (7); The pump oil filtration mechanism (6) includes an oil transmission component, a spliced ​​oil filtration component located inside the oil transmission component, several impurity accumulation detection components located on the spliced ​​oil filtration component, and an energy storage switching component located between the oil transmission component and the spliced ​​oil component. The input end of the oil transmission component is connected to the output end of the hydraulic pump (3), and its output end is connected to the input end of the control valve (7). The spliced ​​oil filter component is provided with several filter channels. The two ends of the filter channel located at a set position in the oil transmission component are respectively connected to the input end and the output end of the oil transmission component to form a complete oil flow path. The impurity accumulation detection component is used to obtain the amount of impurities accumulated in the corresponding filter channel in the spliced ​​oil filter component. The energy storage switching component is used to switch the filter channel in the complete oil flow path. The modular oil filtration assembly includes a multi-channel filtration assembly and several extended oil filtration assemblies disposed on the multi-channel filtration assembly, with the several extended oil filtration assemblies evenly distributed on the multi-channel filtration assembly. The multi-channel filter assembly includes a rotating shaft (618) movably connected to the middle of the housing (601), a connecting rod (619) connected to the rotating shaft (618), an inner ring (606) and an outer ring (604) coaxially arranged with the rotating shaft (618), a plurality of partition plates (605) connected between the outer ring (604) and the inner ring (606), and a fan-shaped filter plate (607) disposed between two adjacent partition plates (605). Slider (609) is connected to both sides of the wall. The partition plate (605) is provided with a groove (608) that cooperates with the corresponding slider (609). The cross-sectional area of ​​the fan-shaped filter plate (607) is larger than the cross-sectional area of ​​the first oil inlet pipe (602). A filter channel is formed between the outer ring body (604), the inner ring body (606) and the two adjacent partition plates (605). The fan-shaped filter plate (607) in the corresponding filter channel is used to filter the oil flowing through the filter channel. The extended oil filtration assembly includes a plurality of arc-shaped extended grooves (612) disposed on the inner circular surface of the outer ring body (604) and an arc-shaped filter plate (613) fixedly connected to the opening of the arc-shaped extended grooves (612). The plurality of arc-shaped extended grooves (612) are evenly distributed and the arc-shaped extended grooves (612) are located between two adjacent partition plates (605). The fan-shaped filter plate (607) is tightly fitted with the arc-shaped filter plate (613). The arc-shaped extended grooves (612) are connected to the corresponding filter channels. The energy storage switching assembly includes a motor (615) connected to the housing (601), a drive cylinder (616) connected to the output shaft end of the motor (615), a torsion spring (617) connected between the drive cylinder (616) and the rotating shaft (618), a fixed cylinder (620) fixedly connected to the inner wall of the housing (601), a plurality of fixed blades (621) fixedly connected to the inner circular surface of the fixed cylinder (620), and a plurality of plastic blades (622) fixedly connected to the rotating shaft (618). The plurality of fixed blades (621) are equiangularly distributed on the inner circular surface of the fixed cylinder (620), and the plurality of plastic blades (622) are equiangularly distributed on the outer circular surface of the rotating shaft (618). The fixed cylinder (620) and the plastic blades (622) can contact each other.

2. The hydraulic power unit for a bridge-building machine according to claim 1, characterized in that, The oil transfer assembly includes a housing (601), a first oil inlet pipe (602) and a first oil outlet pipe (603) symmetrically connected to the housing (601). The other end of the first oil inlet pipe (602) is connected to the output end of the hydraulic pump (3), and the other end of the first oil outlet pipe (603) is connected to the input end of the control valve (7).

3. A hydraulic power unit for a bridge-building machine according to claim 2, characterized in that, The impurity accumulation detection component includes a telescopic bladder (610) and a telescopic spring (611) connected between the inner walls of the slider (609) and the groove (608), a connecting channel provided inside the partition plate (605) and the outer ring body (604), and a pressure sensor (614) connected to the outer circular surface of the outer ring body (604). The internal space of the telescopic bladder (610) is connected to the pressure sensor (614) through the connecting channel, and the pressure sensor (614) is connected to the control terminal signal.

4. A hydraulic power unit for a bridge-building machine according to claim 3, characterized in that, The oil transfer assembly is equipped with an oil backflushing cleaning assembly, which is used to backflush the filter channel that has been switched out from the complete oil flow path.

5. A hydraulic power unit for a bridge-building machine according to claim 4, characterized in that, The oil backflushing cleaning assembly includes a second oil inlet pipe (623) and a second oil outlet pipe (624) symmetrically connected to the housing (601). The second oil inlet pipe (623) is located below the first oil outlet pipe (603), and the second oil outlet pipe (624) is located below the first oil inlet pipe (602).

6. A hydraulic power system for a bridge-building machine, characterized in that, The device includes a hydraulic power unit for a bridge-building machine as described in any one of claims 1-5, a plurality of oil pipelines, and a plurality of execution units, wherein the plurality of execution units are respectively connected to the hydraulic power unit for the bridge-building machine through the plurality of oil pipelines; the execution unit includes a hydraulic cylinder and a connector connected to the output end of the hydraulic cylinder.

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