A wheeled engineering vehicle and its emergency trailer control system and method

Abstract

The present application discloses a wheeled engineering vehicle and its emergency towing control system and method. When the wheeled engineering vehicle is in a stopped state and needs to be towed, by opening the first, second, four-way reversing valve and the second, two-way four-way reversing valve, and putting the brake foot valve in a stepped state, the oil can pass through the brake foot valve, the first, second, four-way reversing valve and the shuttle valve in sequence to the parking brake oil port of the rear axle, so that the parking brake of the rear axle is released, and the oil in the service brake oil port of the rear axle returns through the first, second, four-way reversing valve, and the service brake of the rear axle is released; at the same time, the oil can pass through the brake foot valve and the second, second, four-way reversing valve in sequence to the hydraulic control port of the hydraulically controlled two-way valve, so that the inlet and outlet oil ports of the travel motor are connected through the working oil port of the hydraulically controlled two-way valve, thereby realizing oil circulation inside the travel motor; the oil pressure of the service brake oil port of the front axle returns through the second, second, four-way reversing valve, the service brake of the front axle is released, and the front axle can rotate.

Description

Technical Field

[0001] The present application belongs to the technical field of engineering machinery, and specifically relates to a wheeled engineering vehicle and an emergency trailer control system and method thereof. Background Art

[0002] When a wheeled hydraulic engineering vehicle (such as a small-tonnage wheeled hydraulic excavator) is in a stopped state, the rear axle is in a parked state and the tires cannot rotate to prevent the vehicle from slipping and causing safety hazards.

[0003] However, in certain specific situations, the vehicle needs to be towed away, such as when the entire vehicle cannot be started due to damage to a key component, or when the vehicle is in a dangerous area. The entire vehicle needs to be towed away from the dangerous area. If the parking position is not released, the entire vehicle cannot be towed, and forced towing will damage the transmission system (such as the drive shaft and bridge) of the wheeled hydraulic engineering vehicle.

[0004] At this point, special means are required to manually release the transmission system from the parking state, namely by adjusting the parking brake adjustment bolt to release the parking torque to zero. However, when restoring the vehicle, a professional must return to the factory for calibration and restoration of the transmission system. Otherwise, the axle will be damaged or performance will not meet standards. When the axle parking brake is released, the travel motor is directly connected to the gearbox and has a balance valve. At this time, the balance valve is closed, and the travel motor has a reverse drag effect. A huge amount of traction is required to tow the vehicle. Usually, the drive shafts are disassembled front and back so that the entire vehicle can be towed. Currently, the emergency towing method of this tire-type hydraulic engineering vehicle is cumbersome and inconvenient. Summary of the Invention

[0005] Purpose: In view of at least one of the above technical problems, the present application provides a wheeled engineering vehicle and its emergency towing control system and method, which can release the axle parking brake when the wheeled hydraulic engineering vehicle is in an abnormal state (such as unable to be powered on and started), and the main oil circuit of the travel motor is connected to realize self-circulation of the internal oil circuit of the motor, which can realize rapid towing and effectively protect the components of the wheeled hydraulic engineering vehicle.

[0006] Technical solution: To solve the above technical problems, the technical solution adopted by this application is:

[0007] In a first aspect, a wheeled engineering vehicle emergency towing control system is provided, comprising a brake foot valve, a first two-position four-way reversing valve, a second two-position four-way reversing valve, a shuttle valve, an electrically controlled two-position three-way valve, a rear axle, a hydraulically controlled two-position two-way valve, a travel motor, and a front axle;

[0008] The first working oil port B2 of the brake foot valve is connected to the oil inlet C4 of the first two-position four-way reversing valve, and the second working oil port B3 of the brake foot valve is connected to the oil inlet D3 of the second two-position four-way reversing valve; the first working oil port C3 of the first two-position four-way reversing valve is connected to the service brake oil ports G3 and G4 of the rear axle, the second working oil port C1 of the first two-position four-way reversing valve is connected to the second oil inlet F2 of the shuttle valve, the first working oil port D4 of the second two-position four-way reversing valve is connected to the service brake oil ports K1 and K2 of the front axle, and the second two-position four-way reversing valve is connected to the service brake oil ports G3 and G4 of the rear axle. The second working oil port D2 of the directional valve is connected to the hydraulic control port J3 of the hydraulically controlled two-position two-way valve; the pilot oil port E3 of the electrically controlled two-position three-way valve is connected to the pilot oil, the first oil inlet F1 of the shuttle valve is connected to the oil outlet E2 of the electrically controlled two-position three-way valve, and the oil outlet F3 of the shuttle valve is connected to the parking brake oil ports G1 and G2 of the rear axle; the first working oil port J1 of the hydraulically controlled two-position two-way valve is connected to one of the first oil inlet and outlet ports H3 and H4 of the travel motor, and the second working oil port J2 of the hydraulically controlled two-position two-way valve is connected to the other of the first oil inlet and outlet ports H3 and H4 of the travel motor;

[0009] When the wheeled engineering vehicle is in a stopped state and needs to be towed, by opening the first two-position four-way reversing valve and the second two-position four-way reversing valve and pressing the brake pedal valve, the oil inlet B1 of the brake pedal valve is connected to the first working oil port B2, the second working oil port B3 of the brake pedal valve is connected to the second oil inlet B4, the second working oil port C1 of the first two-position four-way reversing valve is connected to the oil inlet C4, and the first working oil port C3 is connected to the return oil port C2; the first working oil port D4 of the second two-position four-way reversing valve is connected to the return oil port D1, the second working oil port D2 is connected to the oil inlet D3, the hydraulic control port J3 of the hydraulically controlled two-position two-way valve has pilot oil, and the working oil ports J1 and J2 are connected; the parking brake and service brake of the rear axle are released, and the travel motor is supplied with oil through the working oil ports J1 and J2 of the hydraulically controlled two-position two-way valve, realizing oil circulation inside the travel motor and releasing the service brake of the front axle.

[0010] In some embodiments, the wheeled engineering vehicle emergency trailer control system further includes a filling valve, wherein the first working oil port A2 of the filling valve is connected to the oil inlet B1 of the brake foot valve, and the second working oil port A3 of the filling valve is connected to the second oil inlet B4 of the brake foot valve.

[0011] Furthermore, in some embodiments, the wheeled engineering vehicle emergency trailer control system further includes a first accumulator and a second accumulator, and the charging valve further includes a first energy storage port A1, a second energy storage port A4, an oil inlet A5, and an oil return port A6;

[0012] The oil inlet A5 of the charging valve is connected to the gear pump and is in one-way communication with the first energy storage port A1, the first working oil port A2, the second working oil port A3, and the second energy storage port A4 respectively; the first energy storage port A1 is connected to the first accumulator and is in communication with the first working oil port A2; the second energy storage port A4 is connected to the second accumulator and is connected to the second working oil port A3; the oil return port A6 of the charging valve is connected to the oil tank.

[0013] In some embodiments, the oil return port B5 of the brake foot valve is connected to the oil tank; when the brake foot valve is in the unpressed state, the oil inlet B1 and the second oil inlet B4 are cut off, the first working oil port B2 is connected to the oil return port B5, and the second working oil port B3 is connected to the oil return port B5; when the brake foot valve is in the pressed state, the oil inlet B1 is connected to the first working oil port B2, the second working oil port B3 is connected to the second oil inlet B4, and the oil return port B5 is cut off.

[0014] In some embodiments, the oil return port C2 of the first manual two-position four-way valve is connected to the oil tank;

[0015] The oil return port D1 of the second two-position four-way reversing valve is connected to the oil tank;

[0016] The oil return port E1 of the electric two-position three-way valve is connected to the oil tank.

[0017] In some embodiments, the wheeled engineering vehicle emergency trailer control system further includes a gearbox and a drive shaft, wherein the gearbox is mechanically connected to the travel motor; the rear axle, the front axle and the gearbox are mechanically connected via the drive shaft.

[0018] In some embodiments, the first two-position four-way reversing valve and the second two-position four-way reversing valve are both normally closed two-position four-way reversing valves; the first two-position four-way reversing valve and the second two-position four-way reversing valve are controlled manually or by external electrical control.

[0019] In some embodiments, when there is pilot oil in the hydraulic control port J3 of the hydraulically controlled two-position two-way valve, the first oil port J1 and the second oil port J2 are connected; when there is no pilot oil in the hydraulic control port J3 of the hydraulically controlled two-position two-way valve, the first oil port J1 and the second oil port J2 are not connected.

[0020] In some embodiments, the wheeled engineering vehicle emergency trailer control system further includes a main valve, which is connected to the second oil inlet and outlet H1 and H2 of the travel motor, and is used to supply oil to the travel motor through the main valve to achieve travel when the wheeled engineering vehicle is started.

[0021] In a second aspect, a wheeled engineering vehicle is provided, comprising the above-mentioned wheeled engineering vehicle emergency trailer control system.

[0022] In a third aspect, a method for controlling an emergency trailer of a wheeled engineering vehicle is provided. Based on the above-mentioned emergency trailer control system of the wheeled engineering vehicle, the method includes:

[0023] When the wheeled engineering vehicle is in a stopped state and needs to be towed, the electrically controlled two-position three-way valve is in a power-off state, and the first two-position four-way reversing valve and the second two-position four-way reversing valve are in a normally closed state;

[0024] Open the first two-position four-way reversing valve and the second two-position four-way reversing valve manually or through external electrical control, and put the brake pedal valve in the depressed state. The oil inlet B1 of the brake pedal valve is connected to the first working oil port B2, the second working oil port B3 of the brake pedal valve is connected to the second oil inlet B4, the second working oil port C1 of the first two-position four-way reversing valve is connected to the oil inlet C4, and the first working oil port C3 is connected to the oil return port C2; the first working oil port D4 of the second two-position four-way reversing valve is connected to the oil return port D1, the second working oil port D2 is connected to the oil inlet D3, the hydraulic control port J3 of the hydraulically controlled two-position two-way valve has pilot oil, and the working oil ports J1 and J2 are connected;

[0025] The oil pressure flows through the oil inlet B1 of the brake foot valve, the first working oil port B2, the oil inlet C4 of the first two-position four-way reversing valve, and the second working oil port C1 to the second oil inlet F2 of the shuttle valve. Then, the oil pressure flows through the oil outlet F3 of the shuttle valve to the parking brake oil ports G1 and G2 of the rear axle. The parking brake of the rear axle is released, and the oil in the service brake oil ports G3 and G4 of the rear axle returns to the tank through the first working oil port C3 and the return oil port C2 of the first two-position four-way reversing valve. The service brake of the rear axle is released, and the rear axle can rotate.

[0026] At the same time, the oil pressure reaches the hydraulic control port J3 of the hydraulically controlled two-way valve through the second oil inlet B4 of the brake foot valve, the second working oil port B3, the oil inlet D3 and the second working oil port D2 of the second two-position four-way reversing valve. The first oil inlet and outlet H3 and H4 of the travel motor are connected through the first working oil port J1 and the second working oil port J2 of the hydraulically controlled two-position two-way valve, realizing the internal oil circulation of the travel motor;

[0027] The oil pressure of the front axle's service brake oil ports K1 and K2 returns to the oil tank through the first working oil port D4 and the return oil port D1 of the second two-position four-way reversing valve, the front axle's service brake is released, and the front axle can rotate.

[0028] Compared with the existing technology, the present invention achieves the following beneficial effects: it establishes partial system pressure when the vehicle is stopped, releases the parking brake on the axle, and simultaneously circulates the oil circuit inside the travel motor, allowing the motor to rotate. It achieves an emergency towable state without the need to disassemble or change any parts, effectively protecting the original vehicle connection, and is simple, fast, and efficient.

[0029] The original service brake system is used to solve the parking brake problem and the travel motor oil circuit problem.

[0030] This system does not affect the normal braking performance of the entire machine. At the same time, when the entire machine cannot be started (such as a sudden failure), it can quickly release the parking brake system of the entire vehicle, and at the same time make the internal oil circuit of the travel motor circulate internally to avoid a large reaction force of the travel motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0032] Figure 1 This is a schematic diagram of an emergency towing control system for a wheeled engineering vehicle according to an embodiment of the present application;

[0033] The markings in the figure are as follows: charging valve 1, first accumulator 2, second accumulator 3, brake foot valve 4, first two-position four-way reversing valve 5, second two-position four-way reversing valve 6, shuttle valve 7, electronically controlled two-position three-way valve 8, rear axle 9, gearbox 10, hydraulically controlled two-position two-way valve 11, travel motor 12, drive shaft 13, front axle 14. DETAILED DESCRIPTION

[0034] The following will be combined with the accompanying drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only some embodiments of the present application, rather than all embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present application, its application, or use.

[0035] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "back," "left," "right," "inner," and "outer," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are used only to explain the relative positional relationships and movement of components in a specific posture. If the specific posture changes, the directional indications will also change accordingly. These terms are used solely to facilitate the description of this application and simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting this application.

[0036] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified with "first," "second," etc., may explicitly or implicitly include one or more of the features. Throughout the description of this application, unless otherwise specified, "plurality" means two or more.

[0037] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0038] like Figure 1 As shown, a wheeled engineering vehicle emergency towing control system includes a brake pedal valve 4, a first two-position four-way reversing valve 5, a second two-position four-way reversing valve 6, a shuttle valve 7, an electrically controlled two-position three-way valve 8, a rear axle 9, a hydraulically controlled two-position two-way valve 11, a travel motor 12, and a front axle 14;

[0039] The first working oil port B2 of the brake pedal valve 4 is connected to the oil inlet C4 of the first two-position four-way reversing valve 5, and the second working oil port B3 of the brake pedal valve 4 is connected to the oil inlet D3 of the second two-position four-way reversing valve 6; the first working oil port C3 of the first two-position four-way reversing valve 5 is connected to the service brake oil ports G3 and G4 of the rear axle 9, the second working oil port C1 of the first two-position four-way reversing valve 5 is connected to the second oil inlet F2 of the shuttle valve 7, the first working oil port D4 of the second two-position four-way reversing valve 6 is connected to the service brake oil ports K1 and K2 of the front axle 14, and the second two-position four-way reversing valve The second working oil port D2 of the hydraulically controlled two-position two-way valve 11 is connected to the hydraulic control port J3; the pilot oil port E3 of the electrically controlled two-position three-way valve 8 is connected to the pilot oil, the first oil inlet F1 of the shuttle valve 7 is connected to the oil outlet E2 of the electrically controlled two-position three-way valve 8, and the oil outlet F3 of the shuttle valve 7 is connected to the parking brake oil ports G1 and G2 of the rear axle 9; the first working oil port J1 of the hydraulically controlled two-position two-way valve 11 is connected to one of the first oil inlet and outlet ports H3 and H4 of the travel motor 12, and the second working oil port J2 of the hydraulically controlled two-position two-way valve 11 is connected to the other of the first oil inlet and outlet ports H3 and H4 of the travel motor 12;

[0040] When the wheeled engineering vehicle is in a stopped state and needs to be towed, the first two-position four-way reversing valve 5 and the second two-position four-way reversing valve 6 are opened manually or by external electric control, and the brake pedal valve 4 is in a stepped state, the oil inlet B1 of the brake pedal valve 4 is connected to the first working oil port B2, the second working oil port B3 of the brake pedal valve 4 is connected to the second oil inlet B4, the second working oil port C1 of the first two-position four-way reversing valve 5 is connected to the oil inlet C4, and the first working oil port C3 is connected to the The oil return port C2 is connected; the first working oil port D4 of the second two-position four-way reversing valve 6 is connected to the oil return port D1, the second working oil port D2 is connected to the oil inlet D3, the hydraulic control port J3 of the hydraulically controlled two-position two-way valve 11 has pilot oil, and the working oil ports J1 and J2 are connected; so that the parking brake and service brake of the rear axle 9 are released, and oil is supplied to the travel motor 12 through the working oil ports J1 and J2 of the hydraulically controlled two-position two-way valve 11, realizing the internal oil circulation of the travel motor, and the service brake of the front axle 14 is released.

[0041] In some embodiments, a wheeled engineering vehicle emergency towing control system further includes a charging valve 1 , a first accumulator 2 , a second accumulator 3 , a gearbox 10 , a transmission shaft 13 and a front axle 14 .

[0042] In some embodiments, the charging valve 1 has 6 oil ports, namely the first energy storage port A1, the first working oil port A2, the second working oil port A3, the second energy storage port A4, the oil inlet A5 and the oil return port A6; the oil inlet A5 of the charging valve 1 is connected to the gear pump, and is respectively unidirectionally connected to the first energy storage port A1, the first working oil port A2, the second working oil port A3 and the second energy storage port A4; the first energy storage port A1 is connected to the first accumulator 2 and is connected to the first working oil port A2; the second energy storage port A4 is connected to the second accumulator 3 and is connected to the second working oil port A3; the first working oil port A2 of the charging valve 1 is connected to the oil inlet B1 of the brake foot valve 4, and the second working oil port A3 of the charging valve 1 is connected to the second oil inlet B4 of the brake foot valve 4; the oil return port A6 of the charging valve 1 is connected to the oil tank.

[0043] The brake foot valve 4 has 5 oil ports, namely the oil inlet B1, the first working oil port B2, the second working oil port B3, the second oil inlet B4 and the oil return port B5; the oil return port B5 of the brake foot valve 4 is connected to the oil tank; when the brake foot valve 4 is in the unpressed state, the oil inlet B1 and the second oil inlet B4 are cut off, the first working oil port B2 is connected to the oil return port B5, and the second working oil port B3 is connected to the oil return port B5; when the brake foot valve 4 is in the pressed state, the oil inlet B1 is connected to the first working oil port B2, the second working oil port B3 is connected to the second oil inlet B4, and the oil return port B5 is cut off.

[0044] The first two-position four-way reversing valve 5 has four oil ports, namely the second working oil port C1, the return oil port C2, the first working oil port C3 and the oil inlet C4; when the first two-position four-way reversing valve 5 is in the normally closed state, the second working oil port C1 is connected to the return oil port C2, and the first working oil port C3 is connected to the oil inlet C4; when the first two-position four-way reversing valve 5 is opened, the second working oil port C1 is connected to the oil inlet C4, and the return oil port C2 is connected to the first working oil port C3.

[0045] The second two-position four-way reversing valve 6 has four oil ports, namely the return oil port D1, the second working oil port D2, the oil inlet D3 and the first working oil port D4; when in the normally closed state, the return oil port D1 is connected with the second working oil port D2, and the oil inlet D3 is connected with the first working oil port D4; when the second two-position four-way reversing valve 6 is opened, the return oil port D1 is connected with the first working oil port D4, and the second working oil port D2 is connected with the oil inlet D3.

[0046] In some embodiments, the first two-position four-way reversing valve 5 and the second two-position four-way reversing valve 6 are both normally closed two-position four-way reversing valves; further, the control mode of the first two-position four-way reversing valve 5 and the second two-position four-way reversing valve 6 can be manual or external electric control.

[0047] The shuttle valve 7 has three oil ports, namely a first oil inlet F1, a second oil inlet F2 and an oil outlet F3.

[0048] The electrically controlled two-position three-way valve 8 is provided with an oil return port E1, an oil outlet port E2 and a pilot oil port E3. When the electrically controlled two-position three-way valve 8 is not energized, the oil return port E1 is connected to the oil outlet port E2, and the pilot oil port E3 is cut off; when the electrically controlled two-position three-way valve 8 is energized, the pilot oil port E3 is connected to the oil outlet port E2, and the oil return port E1 is cut off.

[0049] The rear axle 9 has four oil ports, of which G1 and G2 are parking brake oil ports. When there is no oil pressure in the parking brake oil ports G1 and G2, the parking brake takes effect and the rear axle cannot rotate. When there is oil pressure in the parking brake oil ports G1 and G2, the parking brake is released and the rear axle 9 can rotate. G3 and G4 are service brake oil ports. When there is no oil pressure in the service brake oil ports G3 and G4, the service brake is released and the rear axle 9 can rotate. When there is oil pressure in the service brake oil ports G3 and G4, the service brake takes effect and the rear axle 9 cannot rotate.

[0050] The hydraulically controlled two-position two-way valve 11 has three oil ports. When there is pilot oil in the hydraulic control port J3 of the hydraulically controlled two-position two-way valve 11, the first working oil port J1 and the second working oil port J2 are connected; when there is no pilot oil in the hydraulic control port J3 of the hydraulically controlled two-position two-way valve 11, the first working oil port J1 and the second working oil port J2 are not connected.

[0051] The travel motor 12 is provided with a second oil inlet and outlet H1, H2, and a first oil inlet and outlet H3, H4; the first working oil port J1 of the hydraulically controlled two-position two-way valve 11 is connected to the first oil inlet H3 of the travel motor 12, and the second working oil port J2 of the hydraulically controlled two-position two-way valve 11 is connected to the first oil outlet H4 of the travel motor 12; the second oil inlet and outlet H1, H2 of the travel motor 12 are connected to the main valve, so as to supply oil to the travel motor 12 through the main valve to achieve travel when the wheeled engineering vehicle is started;

[0052] The gearbox 10 is mechanically connected to the travel motor 12 via a spline; the rear axle 9 , the front axle 14 and the gearbox 10 are mechanically connected via a transmission shaft 13 .

[0053] The front axle 14 has two service brake oil ports K1 and K2. When there is no oil pressure in the service brake oil ports K1 and K2, the service brake is released and the front axle 14 can rotate. When there is oil pressure in the service brake oil ports K1 and K2, the service brake takes effect and the front axle 14 cannot rotate.

[0054] The specific positions and connection relationships of the above components in this embodiment are as follows:

[0055] The first energy storage port A1 of the charging valve 1 is connected to the first accumulator 2, the first working oil port A2 of the charging valve 1 is connected to the oil inlet B1 of the brake foot valve 4, the second working oil port A3 of the charging valve 1 is connected to the second oil inlet B4 of the brake foot valve 4, the second energy storage port A4 of the charging valve 1 is connected to the second accumulator 3, the oil inlet A5 of the charging valve 1 is connected to the gear pump, and the oil return port A6 of the charging valve 1 is connected to the fuel tank; the first working oil port B2 of the brake foot valve 4 is connected to the oil inlet of the first two-position four-way reversing valve 5 C4 is connected, the second working oil port B3 of the brake pedal valve 4 is connected to the oil inlet D3 of the second two-position four-way reversing valve 6, and the oil return port B5 of the brake pedal valve 4 is connected to the fuel tank; the first working oil port C3 of the first two-position four-way reversing valve 5 is connected to the service brake oil ports G3 and G4 of the rear axle 9, the second working oil port C1 of the first two-position four-way reversing valve 5 is connected to the second oil inlet F2 of the shuttle valve 7, and the oil return port C2 of the first two-position four-way reversing valve 5 is connected to the fuel tank; the first working oil port C3 of the second two-position four-way reversing valve 6 is connected to the service brake oil ports G3 and G4 of the rear axle 9, the second working oil port C1 of the first two-position four-way reversing valve 5 is connected to the second oil inlet F2 of the shuttle valve 7, and the oil return port C2 of the first two-position four-way reversing valve 5 is connected to the fuel tank; Port D4 is connected to the service brake oil ports K1 and K2 of the front axle 14, the return oil port D1 of the second two-position four-way reversing valve 6 is connected to the oil tank, and the second working oil port D2 of the second two-position four-way reversing valve 6 is connected to the hydraulic control port J3 of the hydraulically controlled two-position two-way valve 11; the first oil inlet F1 of the shuttle valve 7 is connected to the oil outlet E2 of the electrically controlled two-position three-way valve 8, and the oil outlet F3 of the shuttle valve 7 is connected to the parking brake oil ports G1 and G2 of the rear axle 9; the return oil port E1 of the electrically controlled two-position three-way valve 8 is connected to the oil tank; the electrically controlled two-position three-way valve 8 The pilot oil port E3 is connected to the pilot oil; the first working oil port J1 of the hydraulically controlled two-position two-way valve 11 is connected to one of the first inlet and outlet oil ports H3 and H4 of the travel motor 12, and the second working oil port J2 of the hydraulically controlled two-position two-way valve 11 is connected to the other of the first inlet and outlet oil ports H3 and H4 of the travel motor 12; the second inlet and outlet oil ports H1 and H2 of the travel motor 12 are connected to the main valve; the gearbox 10 is mechanically connected to the travel motor 12; the rear axle 9, the front axle 14 and the gearbox 10 are mechanically connected through the transmission shaft 13.

[0056] In a second aspect, a wheeled engineering vehicle is provided, comprising the above-mentioned wheeled engineering vehicle emergency trailer control system.

[0057] In this embodiment, the wheeled engineering vehicle may be a wheeled hydraulic excavator.

[0058] In a third aspect, the present application also provides a control method for the above-mentioned wheeled engineering vehicle emergency trailer control system, specifically comprising:

[0059] When the wheeled hydraulic engineering vehicle is started, the first two-position four-way reversing valve 5 is in a normally closed state, and the second two-position four-way reversing valve 6 is in a normally closed state; when the electrically controlled two-position three-way valve 8 is in an energized state, the pilot oil passes through the pilot oil port E3 and the oil outlet E2 of the electrically controlled two-position three-way valve 8 to reach the first oil inlet F1 of the shuttle valve 7. At this time, the pressure of the first oil inlet F1 of the shuttle valve 7 is greater than that of the second oil inlet F2. Then the pilot oil reaches the parking brake oil ports G1 and G2 of the rear axle 9 from the oil outlet F3 of the shuttle valve 7. At this time, the parking brake of the rear axle 9 is released; at the same time, the gear pump oil circuit passes through the oil inlet A5 of the charging valve 1 to the A1, A2, A3 and the second energy storage port A4 of the charging valve. The first accumulator 2 is filled through the first energy storage port A1 of the charging valve, and the second accumulator 3 is filled through The second energy storage port A4 of the charging valve is filled with fluid; at this time, when the brake foot valve 4 is not stepped on, when the main valve supplies oil to the travel motor 12, the entire vehicle can move, and when the brake foot valve 4 is stepped on, the oil in the first working oil port A2 of the charging valve 1 reaches C4 and the first working oil port C3 of the first two-position four-way reversing valve 5 from B1 of the brake foot valve 4, and finally reaches the service brake oil ports G3 and G4 of the rear axle 9, realizing the rear axle service braking. At the same time, when the brake foot valve 4 is stepped on, the oil in the second working oil port A3 of the charging valve 1 reaches D3 and the first working oil port D4 of the second two-position four-way reversing valve 6 from B4 of the brake foot valve 4, and finally reaches the service brake oil ports K1 and K2 of the front axle, realizing the front axle service braking.

[0060] When the wheeled hydraulic engineering vehicle is shut down, the first two-position four-way reversing valve 5 is in a normally closed state, the second two-position four-way reversing valve 6 is in a normally closed state, the electronically controlled two-position three-way valve 8 is in a power-off state, and the parking brake oil ports G1 and G2 of the rear axle 9 have no pressure oil, the parking brake takes effect, and the rear axle 9 cannot rotate; at this time, if the brake pedal valve 4 is not stepped on, the service brake oil ports G3 and G4 of the rear axle 9 and the service brake oil ports K1 and K2 of the front axle have no oil pressure, and the service brake does not take effect; at this time, if the brake pedal valve 4 is stepped on The oil pressure of the first accumulator 2 will reach the service brake oil ports G3 and G4 of the rear axle 9 through B1 of the brake foot valve 4, the first working oil port B2, C4 of the first two-position four-way reversing valve 5, and the first working oil port C3. At the same time, the oil pressure of the second accumulator 3 will reach the service brake oil ports K1 and K2 of the front axle 9 through B4 of the brake foot valve 4, the second working oil port B3, D3 of the second two-position four-way reversing valve 6, and the first working oil port D4. At this time, the service brakes of the rear axle 9 and the front axle 14 are both effective.

[0061] When the wheeled hydraulic engineering vehicle is in shutdown state and needs to be towed, the electronically controlled two-position three-way valve 8 is in the power-off state, the first two-position four-way reversing valve 5 is in the normally closed state, and the second two-position four-way reversing valve 6 is in the normally closed state. The following operations must be performed in sequence:

[0062] By manual or external electrical control, the first two-position four-way reversing valve 5 is in the open state, so that the second two-position four-way reversing valve 6 is in the open state. At this time, the brake pedal valve 4 is in the stepped state. The oil pressure of the first accumulator 2 will sequentially pass through the oil inlet B1, the first working oil port B2 of the brake pedal valve 4 and the oil inlet C4, the second working oil port C1 of the first two-position four-way reversing valve 5 to the second oil inlet F2 of the shuttle valve 7, and finally reach the parking brake oil ports G1 and G2 of the rear axle 9 from the oil outlet F3 of the shuttle valve 7. The parking brake of the rear axle 9 is released. At this time, the oil in the service brake oil ports G3 and G4 of the rear axle 9 returns to the oil tank through the first working oil port C3 and the return oil port C2 of the first two-position four-way reversing valve 5. The service brake is released and the rear axle 9 can rotate; at the same time, the oil pressure of the second accumulator 3 will reach the hydraulic control port J3 of the hydraulically controlled two-position two-way valve 11 through the second oil inlet B4, the second working oil port B3 and the oil inlet D3 and the second working oil port D2 of the brake foot valve 4 in sequence. At this time, the oil port H3 of the travel motor 12 is connected with the oil port H4 through the working oil ports J1 and J2 of the hydraulically controlled two-position two-way valve 11, and the travel motor 12 can realize internal oil circulation. At this time, the oil pressure of the service brake oil ports K1 and K2 of the front axle 14 returns to the oil tank through the first working oil port D4 and the return oil port D1 of the second two-position four-way reversing valve 6, the service brake of the front axle 14 is released, and the front axle 14 can rotate.

[0063] After the above operation steps are completed, the wheeled hydraulic engineering vehicle can be towed under the action of external force.

[0064] This embodiment is implemented without any assistance, and the solution can be realized by manually unscrewing or externally electrically controlling the first two-position four-way reversing valve 5 and the second two-position four-way reversing valve 5 .

[0065] In this embodiment, the first two-position four-way reversing valve 5 and the second two-position four-way reversing valve 6 are normally closed two-position four-way reversing valves, which can be controlled manually or electrically (with external power) and can also replace this solution. The hydraulically controlled two-position two-way valve 11 can also be controlled manually or electrically (with external power) and can also replace this solution. They should be regarded as derivative solutions of the present application.

[0066] The above is only a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, technicians in this industry should understand that the present application will have various changes and improvements without departing from the principles and spirit. These improvements should also be regarded as the scope of protection of the present application and are not limited to the above embodiments.

Claims

1. A wheeled engineering vehicle emergency trailer control system, characterized in that: It includes a brake pedal valve (4), a first two-position four-way reversing valve (5), a second two-position four-way reversing valve (6), a shuttle valve (7), an electrically controlled two-position three-way valve (8), a rear axle (9), a hydraulically controlled two-position two-way valve (11), a travel motor (12) and a front axle (14); The first working oil port B2 of the brake pedal valve (4) is connected to the oil inlet C4 of the first two-position four-way reversing valve (5), and the second working oil port B3 of the brake pedal valve (4) is connected to the oil inlet D3 of the second two-position four-way reversing valve (6); the first working oil port C3 of the first two-position four-way reversing valve (5) is connected to the service brake oil ports G3 and G4 of the rear axle (9), the second working oil port C1 of the first two-position four-way reversing valve (5) is connected to the second oil inlet F2 of the shuttle valve (7), the first working oil port D4 of the second two-position four-way reversing valve (6) is connected to the service brake oil ports K1 and K2 of the front axle (14), and the second two-position four-way reversing valve ( The second working oil port D2 of the hydraulically controlled two-position two-way valve (6) is connected to the hydraulically controlled port J3 of the hydraulically controlled two-position two-way valve (11); the pilot oil port E3 of the electrically controlled two-position three-way valve (8) is connected to the pilot oil, the first oil inlet F1 of the shuttle valve (7) is connected to the oil outlet E2 of the electrically controlled two-position three-way valve (8), and the oil outlet F3 of the shuttle valve (7) is connected to the parking brake oil ports G1 and G2 of the rear axle (9); the first working oil port J1 of the hydraulically controlled two-position two-way valve (11) is connected to one of the first oil inlet and outlet ports H3 and H4 of the travel motor (12), and the second working oil port J2 of the hydraulically controlled two-position two-way valve (11) is connected to the other of the first oil inlet and outlet ports H3 and H4 of the travel motor (12); When the wheeled engineering vehicle is in a stopped state and needs to be towed, by opening the first two-position four-way reversing valve (5) and the second two-position four-way reversing valve (6), and putting the brake pedal valve (4) in a depressed state, the oil inlet B1 of the brake pedal valve (4) is connected to the first working oil port B2, the second working oil port B3 of the brake pedal valve (4) is connected to the second oil inlet B4, the second working oil port C1 of the first two-position four-way reversing valve (5) is connected to the oil inlet C4, the first working oil port C3 is connected to the oil return port C2 The first working oil port D4 of the second two-position four-way reversing valve (6) is connected to the oil return port D1, the second working oil port D2 is connected to the oil inlet port D3, the hydraulic control port J3 of the hydraulic control two-position two-way valve (11) has pilot oil, and the working oil ports J1 and J2 are connected; so that the parking brake and the service brake of the rear axle (9) are released, and the travel motor (12) is supplied with oil through the working oil ports J1 and J2 of the hydraulic control two-position two-way valve (11), so that the oil circulation inside the travel motor is realized, and the service brake of the front axle (14) is released; It also includes a main valve, which is connected to the second oil inlet and outlet H1 and H2 of the travel motor (12) and is used to supply oil to the travel motor (12) through the main valve to achieve travel when the wheeled engineering vehicle is started.

2. The wheeled engineering vehicle emergency towing control system according to claim 1, characterized in that: It also includes a filling valve (1), wherein a first working oil port A2 of the filling valve (1) is connected to an oil inlet B1 of a brake pedal valve (4), and a second working oil port A3 of the filling valve (1) is connected to a second oil inlet B4 of the brake pedal valve (4).

3. The wheeled engineering vehicle emergency towing control system according to claim 2, characterized in that: It also includes a first accumulator (2) and a second accumulator (3), and the charging valve (1) also includes a first energy storage port A1, a second energy storage port A4, an oil inlet A5 and an oil return port A6; The oil inlet A5 of the charging valve (1) is connected to the gear pump and is in one-way communication with the first energy storage port A1, the first working oil port A2, the second working oil port A3, and the second energy storage port A4 respectively; the first energy storage port A1 is connected to the first accumulator (2) and is in communication with the first working oil port A2; the second energy storage port A4 is connected to the second accumulator (3) and is in communication with the second working oil port A3; the oil return port A6 of the charging valve (1) is connected to the oil tank.

4. The wheeled engineering vehicle emergency towing control system according to claim 1, characterized in that: The oil return port B5 of the brake pedal valve (4) is connected to the oil tank; when the brake pedal valve (4) is in a non-pressed state, the oil inlet B1 and the second oil inlet B4 are blocked, the first working oil port B2 is connected to the oil return port B5, and the second working oil port B3 is connected to the oil return port B5; when the brake pedal valve (4) is in a pressed state, the oil inlet B1 is connected to the first working oil port B2, the second working oil port B3 is connected to the second oil inlet B4, and the oil return port B5 is blocked.

5. The wheeled engineering vehicle emergency towing control system according to claim 1, characterized in that: The oil return port C2 of the first manual two-position four-way valve (5) is connected to the oil tank; The oil return port D1 of the second two-position four-way reversing valve (6) is connected to the oil tank; The oil return port E1 of the electric two-position three-way valve (8) is connected to the oil tank.

6. The wheeled engineering vehicle emergency towing control system according to claim 1, characterized in that: It also includes a gearbox (10) and a transmission shaft (13), wherein the gearbox (10) is mechanically connected to the travel motor (12); and the rear axle (9), the front axle (14) and the gearbox (10) are mechanically connected via the transmission shaft (13).

7. The wheeled engineering vehicle emergency towing control system according to claim 1, characterized in that: The first two-position four-way reversing valve (5) and the second two-position four-way reversing valve (6) are both normally closed two-position four-way reversing valves; the first two-position four-way reversing valve (5) and the second two-position four-way reversing valve (6) are controlled manually or in an externally electrically controlled manner.

8. The wheeled engineering vehicle emergency towing control system according to claim 1, characterized in that: When the hydraulic control port J3 of the hydraulically controlled two-position two-way valve (11) has pilot oil, the first oil port J1 and the second oil port J2 are connected; when the hydraulic control port J3 of the hydraulically controlled two-position two-way valve (11) has no pilot oil, the first oil port J1 and the second oil port J2 are not connected.

9. A wheeled engineering vehicle, characterized in that: The invention comprises the emergency towing control system for a wheeled engineering vehicle according to any one of claims 1 to 8.

10. A wheeled engineering vehicle emergency towing control method, characterized in that: Based on the wheeled engineering vehicle emergency towing control system according to any one of claims 1 to 8, the method comprises: When the wheeled engineering vehicle is in a stopped state and needs to be towed, the electrically controlled two-position three-way valve (8) is in a power-off state, and the first two-position four-way reversing valve (5) and the second two-position four-way reversing valve (6) are in a normally closed state; The first two-position four-way reversing valve (5) and the second two-position four-way reversing valve (6) are opened manually or by external electric control, and the brake pedal valve (4) is in a stepped-on state, the oil inlet B1 of the brake pedal valve (4) is connected to the first working oil port B2, the second working oil port B3 of the brake pedal valve (4) is connected to the second oil inlet B4, the second working oil port C1 of the first two-position four-way reversing valve (5) is connected to the oil inlet C4, and the first working oil port C3 is connected to the return oil port C2; the first working oil port D4 of the second two-position four-way reversing valve (6) is connected to the return oil port D1, the second working oil port D2 is connected to the oil inlet D3, the hydraulic control port J3 of the hydraulically controlled two-position two-way valve (11) has pilot oil, and the working oil ports J1 and J2 are connected; The oil pressure reaches the second oil inlet F2 of the shuttle valve (7) through the oil inlet B1 of the brake pedal valve (4), the first working oil port B2, the oil inlet C4 of the first two-position four-way reversing valve (5), and the second working oil port C1, and then reaches the parking brake oil ports G1 and G2 of the rear axle (9) from the oil outlet F3 of the shuttle valve (7). The parking brake of the rear axle (9) is released, and the oil in the service brake oil ports G3 and G4 of the rear axle (9) returns to the oil tank through the first working oil port C3 and the return oil port C2 of the first two-position four-way reversing valve (5). The service brake of the rear axle (9) is released, and the rear axle (9) can rotate. At the same time, the oil pressure reaches the hydraulic control port J3 of the hydraulically controlled two-way valve (11) through the second oil inlet B4 of the brake pedal valve (4), the second working oil port B3, the oil inlet D3 and the second working oil port D2 of the second two-position four-way reversing valve (6), and the first oil inlet and outlet H3 and H4 of the travel motor (12) are connected through the first working oil port J1 and the second working oil port J2 of the hydraulically controlled two-position two-way valve (11), thereby realizing the internal oil circulation of the travel motor (12); The oil pressure of the service brake oil ports K1 and K2 of the front axle (14) returns to the oil tank through the first working oil port D4 and the return oil port D1 of the second two-position four-way reversing valve (6), and the service brake of the front axle (14) is released, and the front axle (14) can rotate.

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