Carrier rocket erecting hydraulic system based on hydraulic transformer

Abstract

The invention discloses a carrier rocket erecting hydraulic system based on a hydraulic transformer. The carrier rocket erecting hydraulic system comprises an erecting oil cylinder, an oil tank, an erecting frame, the hydraulic transformer, a hydraulic pump, a one-way valve, a motor, an oil filter, an energy accumulator, an energy accumulator safety valve, a load mode reversing valve, a hydraulic transformer inlet reversing valve and a hydraulic transformer outlet reversing valve. The hydraulic transformer comprises a hydraulic transformer primary motor and a hydraulic transformer secondary motor; the hydraulic pump comprises a hydraulic pump input shaft, an oil inlet and an oil outlet. The structure of the system can be conveniently changed, the system adapts to the working conditions of boosting erection, flow regeneration and potential energy recovery of the erection oil cylinder, the adaptive capacity of large-range change of the system load is improved, and the system can adapt to the working condition of rapid reversing; and meanwhile, the automation level of the system is improved, hydraulic and mechanical impact in the movement process is reduced, and the movement stability is improved.

Description

Technical Field

[0001] This invention relates to the field of hydraulic system design for launch vehicle erection equipment, and more particularly to a launch vehicle erection hydraulic system based on a hydraulic transformer. Background Technology

[0002] my country's carrier rockets are currently in a high-density launch phase. In terms of launch and test modes, the main modes are "one horizontal and two vertical" and "three vertical". Although these modes are relatively mature, the launch site equipment is complex, the cost is high, and the launch pad occupancy time is long. In contrast, the "three horizontal and one vertical" mode has the advantages of simple launch site equipment, short launch zone time, and the ability to launch quickly and continuously, which is of great significance for reducing launch costs. In the "three vertical and one horizontal" launch mode, the erection process, in which the carrier rocket is raised from a horizontal position to a vertical position, is a crucial process that relates to factors such as the rocket's condition, minimum takeoff conditions, and ignition safety.

[0003] Currently, commonly used rocket erection systems are mainly hydraulically driven, with actuators typically consisting of multi-stage erection cylinders. To ensure rapid erection, the hydraulic pump station requires significant installed power, which adds considerable workload to the launch site's ground support. When the launch vehicle has a large ignition mass, such as hundreds of tons, the power requirement at the launch site can reach hundreds of kilowatts or more to achieve rapid erection, such as within 15 minutes. Furthermore, with the use of cryogenic propellants, there is a strong demand for "zero-second detachment" technology, where the propellant tank filling and emptying pipelines separate from the rocket body at zero seconds after ignition. The corresponding requirement for the erection system is that the erector frame must quickly tilt backward at a certain angle at zero seconds after ignition.

[0004] To reduce the installed power of ground power at the launch site, some hydraulic drive solutions using auxiliary power in the initial stage of erection have been proposed. For example, the accumulator-assisted power system proposed in patent CN109667815B, although using an accumulator as auxiliary power to drive heavy loads, still uses a throttling scheme for system speed regulation, resulting in low efficiency. To meet the system's rapid retraction requirements, patent CN114046688B uses a pre-retraction at a certain angle, and then uses the weight component of the erector frame itself to accelerate the retraction at zero seconds of ignition to ensure zero-second retraction speed. Patent CN110274520B only reverses the umbilical rod to ensure zero-second retraction speed. Both of these modify the erector arm structure and the retraction action profile, which is not conducive to the modification of existing erection systems.

[0005] In addition, from the perspective of hydraulic system speed regulation, hydraulic transformers, as a flow and pressure control element, can efficiently complete servo control functions in the field of high load speed regulation due to their volume speed regulation principle. Patent CN108278232B proposes a heavy marine equipment heave compensation system based on hydraulic transformers. However, the connection relationship of the hydraulic transformer in the system is fixed, which makes it difficult to adapt to the large range of changes in the lifting load from 0 to 100%. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides a hydraulic system for erecting a launch vehicle based on a hydraulic transformer.

[0007] The specific technical solution of this invention is as follows:

[0008] A hydraulic system for erecting a launch vehicle based on a hydraulic transformer includes an erecting cylinder, an oil tank, and an erecting frame. The erecting cylinder and the erecting frame are connected in a way that allows relative movement between them.

[0009] It also includes hydraulic transformers, hydraulic pumps, check valves, electric motors, oil filters, accumulators, accumulator safety valves, load-mode directional valves, hydraulic transformer inlet directional valves, and hydraulic transformer outlet directional valves.

[0010] The one-way valve includes a one-way valve outlet and a one-way valve inlet;

[0011] The hydraulic transformer includes a primary motor and a secondary motor; the primary motor is connected to the lifting cylinder's lifting drive chamber via a hydraulic pipeline; the secondary motor is connected to the primary motor via a coupling; both the primary and secondary motors are variable displacement hydraulic motors.

[0012] The hydraulic pump includes a hydraulic pump input shaft, an oil inlet, and an oil outlet; the hydraulic pump input shaft is connected to a motor via a coupling; the oil inlet is connected to an oil tank via an oil filter; and the oil outlet is connected to the inlet of a one-way valve via a hydraulic pipeline.

[0013] The accumulator safety valve is connected to the accumulator, the check valve outlet, and the load mode directional valve via hydraulic pipelines.

[0014] The load mode reversing valve is connected to the reversing valve of the erecting cylinder, the accumulator outlet, the oil tank and the hydraulic transformer inlet via hydraulic pipelines.

[0015] The hydraulic transformer inlet reversing valve is connected to the hydraulic transformer primary motor, hydraulic transformer secondary motor, oil tank and load mode reversing valve respectively through hydraulic pipelines.

[0016] The hydraulic transformer outlet reversing valve is connected to the primary motor, secondary motor, and oil tank of the hydraulic transformer via hydraulic pipelines.

[0017] Furthermore, the accumulator is a bladder-type accumulator.

[0018] Furthermore, the hydraulic pump is a constant pressure variable pump with a set pressure of P0.

[0019] Furthermore, the launch vehicle erection hydraulic system based on the hydraulic transformer also includes an accumulator outlet pressure sensor, an erection cylinder rodless chamber pressure sensor, an erection cylinder rod chamber pressure sensor, an erection cylinder piston rod displacement sensor, a hydraulic transformer primary motor swashplate tilt angle sensor, a hydraulic transformer secondary motor swashplate tilt angle sensor, and a controller.

[0020] The accumulator outlet pressure sensor is connected to the accumulator outlet and is used to measure the accumulator outlet pressure.

[0021] The rodless chamber pressure sensor of the erecting cylinder is connected to the rodless chamber of the erecting cylinder and is used to measure the pressure in the rodless chamber; the rod chamber pressure sensor of the erecting cylinder is connected to the rod chamber and is used to measure the pressure in the rod chamber; the piston rod displacement sensor of the erecting cylinder is connected to the piston rod of the erecting cylinder and is used to measure the displacement of the piston rod.

[0022] The primary motor swashplate tilt sensor is connected to the swashplate of the primary motor of the hydraulic transformer and is used to measure the swashplate tilt angle of the primary motor of the hydraulic transformer; the secondary motor swashplate tilt sensor is connected to the swashplate of the secondary motor of the hydraulic transformer and is used to measure the swashplate tilt angle of the secondary motor of the hydraulic transformer.

[0023] The controller is input with measured accumulator outlet pressure, rodless chamber pressure, rod chamber pressure, piston rod displacement, and swashplate tilt angles of the primary and secondary motors of the hydraulic transformer. The controller outputs the swashplate tilt angles of the primary and secondary motors of the hydraulic transformer and controls the on / off states of the load mode directional valve, the inlet directional valve, and the outlet directional valve of the hydraulic transformer according to the switching algorithm, thereby changing the connection relationship between the hydraulic transformer and the erecting cylinder.

[0024] Furthermore, the initial charging pressure of the accumulator is n*P0 (n is greater than or equal to 1).

[0025] Furthermore, the pressure set for the accumulator safety valve is m*P0 (m is greater than n).

[0026] Furthermore, the controller is a programmable logic controller (PLC).

[0027] Furthermore, the load mode directional valve is a two-position four-way solenoid directional valve; the hydraulic transformer outlet directional valve and the hydraulic transformer inlet directional valve are each a two-position three-way solenoid directional valve.

[0028] Working principle:

[0029] During the extension or retraction of the piston rod of the erecting cylinder in the erecting system, the speed regulation of the system is achieved by the controller driving the swashplate tilt angle of the primary motor and the secondary motor of the hydraulic transformer. As a preferred control method, the erecting system uses the swashplate tilt angle sensors of the primary motor and the secondary motor of the hydraulic transformer to collect the swashplate tilt angle and the position signal collected by the displacement sensor of the piston rod of the erecting cylinder to complete the closed-loop control.

[0030] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0031] (1) The present invention arranges connection state switching directional valves on the four ports of the conventional hydraulic transformer, and load mode switching directional valves are arranged between the hydraulic transformer, the oil tank and the oil inlet and outlet of the erecting cylinder. The system structure can be easily changed by simply switching the three valves together, adapting to the working conditions of the erecting cylinder for pressure lifting, flow regeneration and potential energy recovery, improving the system's adaptability to large-scale load changes, and enabling the system to adapt to rapid reversal working conditions.

[0032] (2) The system structure of the reversing valve control in this invention is changed. Based on the input of the signals from the accumulator outlet pressure sensor, the rodless chamber pressure sensor of the erecting cylinder, the rod chamber pressure sensor of the erecting cylinder, the piston rod displacement sensor of the erecting cylinder, the swashplate tilt angle sensor of the primary motor of the hydraulic transformer, and the swashplate tilt angle sensor of the secondary motor of the hydraulic transformer, the system can automatically switch between different structures, which improves the automation level of the system, reduces the hydraulic and mechanical shock during the movement, and improves the stability of the movement.

[0033] (3) The present invention uses an energy accumulator as one of the energy sources of the system, which can provide auxiliary power under high load conditions in the early stage of erection to reduce the installed power of the hydraulic pump and reduce the installation space. At the same time, the system potential energy can be recovered during the piston rod retraction process, further improving the system energy utilization rate.

[0034] (4) The present invention aims to propose a hydraulic transmission system solution. The system does not redesign the erection mechanism, so it is easy to upgrade and modify existing products based on hydraulic cylinder erection. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of a launch vehicle erection hydraulic system based on a hydraulic transformer, provided by the present invention.

[0037] Illustration:

[0038] 1 is the oil filter; 2 is the electric motor; 3 is the hydraulic pump; 4 is the check valve; 5 is the oil tank; 6 is the load mode directional valve; 7 is the accumulator safety valve; 8 is the accumulator outlet pressure sensor; 9 is the accumulator; 10 is the piston rod displacement sensor of the erecting cylinder; 11 is the rod chamber pressure sensor of the erecting cylinder; 12 is the erecting cylinder; 13 is the rodless chamber pressure sensor of the erecting cylinder; 14 is the hydraulic transformer outlet directional valve; 15 is the hydraulic transformer; 1501 is the primary motor of the hydraulic transformer; 1502 is the secondary motor of the hydraulic transformer; 16 is the swashplate tilt angle sensor of the primary motor of the hydraulic transformer; 17 is the swashplate tilt angle sensor of the secondary motor of the hydraulic transformer; 18 is the hydraulic transformer inlet directional valve; 19 is the controller. Detailed Implementation

[0039] The technical solutions in the embodiments of the present invention will be clearly and completely described and discussed below with reference to the accompanying drawings. Obviously, what is described here is only a part of the examples of the present invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0040] To facilitate understanding of the embodiments of the present invention, further explanations and descriptions will be provided below with reference to the accompanying drawings and specific embodiments, and these embodiments do not constitute a limitation on the embodiments of the present invention.

[0041] The present invention will now be described in further detail with reference to the accompanying drawings and examples.

[0042] A hydraulic system for erecting a launch vehicle based on a hydraulic transformer includes an erecting cylinder 12, an oil tank 5, and an erecting frame. The erecting cylinder 12 and the erecting frame are connected in a way that allows relative movement between the erecting cylinder 12 and the erecting frame.

[0043] It also includes a hydraulic transformer 15, a hydraulic pump 3, a check valve 4, an electric motor 2, an oil filter 1, an accumulator 9, an accumulator safety valve 7, a load mode reversing valve 6, a hydraulic transformer inlet reversing valve 18, and a hydraulic transformer outlet reversing valve 14.

[0044] The one-way valve 4 includes a one-way valve outlet and a one-way valve inlet.

[0045] The hydraulic transformer 15 includes a primary motor 1501 and a secondary motor 1502. The primary motor 1501 is connected to the lifting cylinder lifting drive chamber via a hydraulic pipeline. The secondary motor 1502 is connected to the primary motor via a coupling. Both the primary motor 1501 and the secondary motor 1502 are variable displacement hydraulic motors.

[0046] The hydraulic pump 3 includes a hydraulic pump input shaft, an oil inlet, and an oil outlet; the hydraulic pump input shaft is connected to the motor 2 via a coupling; the oil inlet is connected to the oil tank 5 via an oil filter 1; and the oil outlet is connected to the inlet of a one-way valve via a hydraulic pipeline.

[0047] The accumulator safety valve 7 is connected to the accumulator 9, the one-way valve outlet and the load mode reversing valve 6 via hydraulic pipelines.

[0048] The load mode reversing valve 6 is connected to the lifting cylinder, the outlet of the accumulator 9, the oil tank 5 and the inlet reversing valve 18 of the hydraulic transformer via hydraulic pipelines.

[0049] The hydraulic transformer inlet reversing valve 18 is connected to the hydraulic transformer primary motor 1501, the hydraulic transformer secondary motor 1502, the oil tank 5 and the load mode reversing valve 6 respectively through hydraulic pipelines.

[0050] The hydraulic transformer outlet reversing valve 14 is connected to the hydraulic transformer primary motor 1501, the hydraulic transformer secondary motor 1502 and the oil tank 5 via hydraulic pipelines.

[0051] In this embodiment, the energy storage device is a bladder-type energy storage device.

[0052] In this embodiment, the hydraulic pump 3 is a constant pressure variable pump with a set pressure of P0.

[0053] The launch vehicle erection hydraulic system based on the hydraulic transformer also includes an accumulator outlet pressure sensor 8, an erection cylinder rodless chamber pressure sensor 13, an erection cylinder rod chamber pressure sensor 11, an erection cylinder piston rod displacement sensor 10, a hydraulic transformer primary motor swashplate tilt angle sensor 16, a hydraulic transformer secondary motor swashplate tilt angle sensor 17, and a controller 19.

[0054] The accumulator outlet pressure sensor 8 is connected to the accumulator outlet and is used to measure the outlet pressure of the accumulator 9.

[0055] The rodless chamber pressure sensor 13 of the erecting cylinder is connected to the rodless chamber of the erecting cylinder and is used to measure the pressure in the rodless chamber; the rod chamber pressure sensor 11 of the erecting cylinder is connected to the rod chamber and is used to measure the pressure in the rod chamber; the piston rod displacement sensor 10 of the erecting cylinder is connected to the piston rod of the erecting cylinder and is used to measure the displacement of the piston rod.

[0056] The primary motor swashplate tilt sensor 16 is connected to the swashplate of the primary motor 1501 of the hydraulic transformer and is used to measure the swashplate tilt angle of the primary motor 1501 of the hydraulic transformer; the secondary motor swashplate tilt sensor 17 is connected to the swashplate of the secondary motor 1502 of the hydraulic transformer and is used to measure the swashplate tilt angle of the secondary motor 1502 of the hydraulic transformer.

[0057] The controller 19 is input with the measured pressure of the accumulator 9 outlet, the pressure of the rodless chamber, the pressure of the rod chamber, the piston rod displacement, and the swashplate tilt angles of the primary motor 1501 and the secondary motor 1502 of the hydraulic transformer. The controller 19 outputs the swashplate tilt angles of the primary motor 1501 and the secondary motor 1502 of the hydraulic transformer, and controls the on / off state of the load mode reversing valve 6, the hydraulic transformer inlet reversing valve 18, and the hydraulic transformer outlet reversing valve 14 according to the switching algorithm, thereby changing the connection relationship between the hydraulic transformer 15 and the erecting cylinder 12.

[0058] In this embodiment, the initial charging pressure of the accumulator is n*P0 (n is greater than or equal to 1).

[0059] In this embodiment, the pressure set for the accumulator safety valve is m*P0 (m is greater than n).

[0060] In this embodiment, the controller 19 is a programmable logic controller (PLC).

[0061] In this embodiment, the load mode reversing valve 6 is a two-position four-way solenoid reversing valve; the hydraulic transformer outlet reversing valve 14 and the hydraulic transformer inlet reversing valve 18 are each a two-position three-way solenoid reversing valve, and the functions of the above valves are as follows: Figure 1 As shown.

[0062] Working principle:

[0063] When the erection system is in the initial erection stage, i.e., the piston rod of the erection cylinder 12 is fully inside the cylinder and not extended, and the reading of the piston rod displacement sensor 10 is 0%, the controller 19 changes the load mode reversing valve 6 and the hydraulic transformer outlet reversing valve 14 to... Figure 1 The other functional position shown maintains the hydraulic transformer inlet directional valve 18 to Figure 1The functional positions shown indicate that the oil outlet of the primary motor 1501 of the hydraulic transformer is connected only to the rodless chamber of the erecting cylinder 12; the oil outlet of the secondary motor 1502 of the hydraulic transformer is connected to the oil tank 5; the oil inlets of the primary motor 1501 and the secondary motor 1502 of the hydraulic transformer are connected and connected to the oil outlet of the accumulator 9 through the load mode reversing valve 6. As the erection process progresses, the pressure in the accumulator 9 gradually decreases. When the accumulator outlet pressure sensor 8 detects that the pressure in the accumulator 9 has dropped to (m+n) / 2*P0, the controller 19 changes the hydraulic transformer inlet reversing valve 18, the load mode reversing valve 6, and the hydraulic transformer outlet reversing valve 14 to... Figure 1 In another functional position, the oil inlet of the primary motor 1501 of the hydraulic transformer is connected to the oil tank 5, and the oil outlet is connected to the rodless chamber of the erecting cylinder 12. At this time, the oil inlet of the secondary motor 1502 of the hydraulic transformer is connected to the outlet of the accumulator 9, and the oil outlet is connected to the oil tank 5, and the erection process continues.

[0064] As the pressure in accumulator 9 further decreases, the piston rod of the erecting cylinder 12 extends further. When the accumulator outlet pressure sensor 8 reads P0 or the piston rod position sensor 10 of the erecting cylinder reaches 90% of its full stroke, the controller 19 changes the hydraulic transformer inlet reversing valve 18 and the load mode reversing valve 6 to... Figure 1 The other functional position shown changes the valve core position of the hydraulic transformer outlet reversing valve 14 to... Figure 1 The indicated functional position connects the oil outlet of the primary motor 1501 of the hydraulic transformer to the oil outlet of the secondary motor 1502 of the hydraulic transformer, and connects to the rodless chamber of the erecting cylinder 12; the oil inlet of the primary motor 1501 of the hydraulic transformer is connected to the oil tank 5, and the oil inlet of the secondary motor 1502 of the hydraulic transformer is connected to the oil outlet of the accumulator 9, continuing the erection process until the erection action is completed.

[0065] After the erection action is completed, the controller 19 changes the valve core of the hydraulic transformer inlet reversing valve 18, the valve core of the hydraulic transformer outlet reversing valve 14, and the valve core of the load mode reversing valve 6 to... Figure 1 The indicated functional position connects the oil outlets of the primary motor 1501 and the secondary motor 1502 of the hydraulic transformer to the rodless chamber of the lifting cylinder 12; the oil inlets of the primary motor 1501 and the secondary motor 1502 of the hydraulic transformer are connected to the rod chamber of the lifting lever 12, at which time the lifting cylinder 12 remains stationary.

[0066] In this embodiment, during the extension or retraction of the piston rod of the erecting cylinder 12 in the erecting system, the system speed adjustment is achieved by the controller 19 driving the swashplate tilt angle of the primary motor 1501 and the secondary motor 1502 of the hydraulic transformer. As a preferred control method, this embodiment uses the swashplate tilt angle collected by the swashplate tilt angle sensor 16 and the swashplate tilt angle sensor 17 of the primary motor of the hydraulic transformer and the position signal collected by the piston rod displacement sensor 10 of the erecting cylinder to complete the closed-loop control, specifically:

[0067] The erecting system controls the piston rod to retract. When the reading of the piston rod position sensor 10 is between 80% and 100% of the full range, the controller 19 changes the valve core position of the hydraulic transformer inlet reversing valve 18 to... Figure 1 Another functional position controls the valve core position of the hydraulic transformer outlet reversing valve 14 and the valve core position of the load mode reversing valve 6. Figure 1 The indicated functional position connects the primary motor 1501 of the hydraulic transformer to the oil outlet of the secondary motor 1502 of the hydraulic transformer, and to the rodless chamber of the lifting cylinder 12; the oil inlet of the primary motor 1501 of the hydraulic transformer is connected to the oil tank 5; the oil inlet of the secondary motor 1502 of the hydraulic transformer is connected to the rod chamber of the lifting cylinder 12, and the system is in a rapid decrease mode of flow regeneration.

[0068] When the piston rod position sensor 10 reads within 0% to 80% of its full range, the controller 19 changes the valve core position of the hydraulic transformer inlet directional valve 18 to... Figure 1 The other functional position shown controls the valve core of the hydraulic transformer outlet reversing valve 14 to... Figure 1 The indicated functional position changes the spool position of the load mode directional valve 6 to... Figure 1 The other functional position shown connects the oil outlet of the primary motor 1501 of the hydraulic transformer to the oil outlet of the secondary motor 1502, and connects to the rodless chamber of the lifting cylinder 12; the oil inlet of the primary motor 1501 of the hydraulic transformer is connected to the oil tank 5; the oil inlet of the secondary motor 1502 of the hydraulic transformer is connected to the accumulator 9, and the system is in the piston rod retracted state for potential energy recovery.

[0069] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention by utilizing the methods and techniques disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

Claims

1. A hydraulic system for erecting a launch vehicle based on a hydraulic transformer, comprising an erecting cylinder (12), an oil tank (5), and an erecting frame, wherein the erecting cylinder (12) and the erecting frame are connected. Its features are: It also includes a hydraulic transformer (15), a hydraulic pump (3), a check valve (4), an electric motor (2), an oil filter (1), an accumulator (9), an accumulator safety valve (7), a load mode reversing valve (6), a hydraulic transformer inlet reversing valve (18), and a hydraulic transformer outlet reversing valve (14). The one-way valve (4) includes a one-way valve outlet and a one-way valve inlet; The hydraulic transformer (15) includes a primary motor (1501) and a secondary motor (1502); the primary motor (1501) is connected to the lifting drive chamber of the lifting cylinder (12) via a hydraulic pipeline; the secondary motor (1502) is connected to the primary motor via a coupling. The hydraulic pump (3) includes a hydraulic pump input shaft, an oil inlet, and an oil outlet; the hydraulic pump input shaft is connected to the motor (2) via a coupling; the oil inlet is connected to the oil tank (5) via an oil filter (1); and the oil outlet is connected to the inlet of a one-way valve via a hydraulic pipeline. The accumulator safety valve (7) is connected to the accumulator (9), the one-way valve outlet and the load mode reversing valve (6) through a hydraulic pipeline; The load mode reversing valve (6) is connected to the erecting cylinder (12), the oil tank (5) and the hydraulic transformer inlet reversing valve (18) respectively through hydraulic pipelines; The hydraulic transformer inlet reversing valve (18) is connected to the hydraulic transformer primary motor (1501), hydraulic transformer secondary motor (1502), oil tank (5) and load mode reversing valve (6) respectively through hydraulic pipelines. The hydraulic transformer outlet reversing valve (14) is connected to the hydraulic transformer primary motor (1501), the hydraulic transformer secondary motor (1502) and the oil tank (5) respectively through hydraulic pipelines.

2. The launch vehicle erection hydraulic system based on a hydraulic transformer as described in claim 1, characterized in that, The accumulator (9) is a bladder-type accumulator.

3. The launch vehicle erection hydraulic system based on a hydraulic transformer as described in claim 1, characterized in that, The hydraulic pump (3) is a constant pressure variable pump with a set pressure of P0.

4. The launch vehicle erection hydraulic system based on a hydraulic transformer as described in claim 1, characterized in that, The launch vehicle erection hydraulic system based on the hydraulic transformer also includes an accumulator outlet pressure sensor (8), an erection cylinder rodless chamber pressure sensor (13), an erection cylinder rod chamber pressure sensor (11), an erection cylinder piston rod displacement sensor (10), a hydraulic transformer primary motor swashplate tilt angle sensor (16), a hydraulic transformer secondary motor swashplate tilt angle sensor (17), and a controller (19). The accumulator outlet pressure sensor (8) is connected to the accumulator outlet and is used to measure the outlet pressure of the accumulator (9); The rodless chamber pressure sensor (13) of the erecting cylinder is connected to the rodless chamber of the erecting cylinder and is used to measure the pressure of the rodless chamber; the rod chamber pressure sensor (11) of the erecting cylinder is connected to the rod chamber and is used to measure the pressure of the rod chamber; the piston rod displacement sensor (10) of the erecting cylinder is connected to the piston rod of the erecting cylinder and is used to measure the displacement of the piston rod. The primary motor swashplate tilt sensor (16) is connected to the swashplate of the primary motor (1501) of the hydraulic transformer and is used to measure the swashplate tilt angle of the primary motor (1501) of the hydraulic transformer; the secondary motor swashplate tilt sensor (17) is connected to the swashplate of the secondary motor (1502) of the hydraulic transformer and is used to measure the swashplate tilt angle of the secondary motor (1502) of the hydraulic transformer. The controller (19) is input with the measured accumulator (9) outlet pressure, rodless chamber pressure, rod chamber pressure, piston rod displacement, and swashplate tilt angle of the hydraulic transformer primary motor (1501) and hydraulic transformer secondary motor (1502). The controller (19) outputs the swashplate tilt angle of the hydraulic transformer primary motor (1501) and hydraulic transformer secondary motor (1502), and controls the on / off state of the load mode reversing valve (6), hydraulic transformer inlet reversing valve (18), and hydraulic transformer outlet reversing valve (14) according to the switching algorithm, thereby changing the connection relationship between the hydraulic transformer (15) and the erecting cylinder (12).

5. The launch vehicle erection hydraulic system based on a hydraulic transformer as described in claim 1, characterized in that, The initial charging pressure of the accumulator (9) is n*P0, where n is greater than or equal to 1.

6. The launch vehicle erection hydraulic system based on a hydraulic transformer as described in claim 1, characterized in that, The pressure set for the accumulator safety valve (7) is m*P0, where m is greater than n.

7. The launch vehicle erection hydraulic system based on a hydraulic transformer as described in claim 4, characterized in that, The controller (19) is a programmable logic controller.

8. The launch vehicle erection hydraulic system based on a hydraulic transformer as described in claim 1, characterized in that, The load mode directional valve (6) is a two-position four-way solenoid directional valve.

9. The launch vehicle erection hydraulic system based on a hydraulic transformer as described in claim 1, characterized in that, The hydraulic transformer outlet reversing valve (14) is a two-position three-way solenoid reversing valve.

10. The launch vehicle erection hydraulic system based on a hydraulic transformer as described in claim 1, characterized in that, The hydraulic transformer inlet directional valve (18) is a two-position three-way solenoid directional valve.

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