Energy-saving speed regulation hydraulic system of snow blower

Abstract

The utility model discloses an energy -conserving speed regulation hydraulic system of snow blower, including shell, blow mouth and the blade of setting in the shell, be equipped with the hydraulic motor (2) of control blade rotation in the shell, the oil inlet end of hydraulic motor (2) is connected with electric proportional valve (3), the oil return end of hydraulic motor (2) is connected with hydraulic oil tank (5), be equipped with the variable pump (1) of keeping electric proportional valve (3) oil inlet, oil outlet end pressure balance between hydraulic oil tank (5) and electric proportional valve (3), through introducing load -sensitive control in hydraulic control loop, make electric proportional valve (3) both end pressure difference basically constant, thereby guarantee the flow of entering hydraulic motor (2) only with electric proportional valve (3) opening is related and is not influenced by load change, and hydraulic motor (2) speed regulation is more convenient, stable, and variable pump (1) provides flow according to load change, and there is no redundant flow output, and hydraulic system has no overflow, and energy -conserving effect is better.

Description

Technical Field

[0001] This utility model belongs to the field of snow blower technology. Specifically, this utility model relates to an energy-saving speed-regulating hydraulic system for a snow blower. Background Technology

[0002] A snow blower is a specialized device used for clearing snow from roads during heavy snowfall in winter. It is generally driven by a hydraulic motor to rotate the impeller and blow the snow on the road to one side. When the snow blower is working, the impeller speed usually needs to be adjusted in real time to adapt to the working environment. The most common speed control method on the market is bypass speed control, which connects a bypass oil line back to the oil tank in parallel with the hydraulic motor's oil inlet line. The motor speed is controlled by adjusting the opening of the throttle valve.

[0003] A patent application with patent number 201721193535.0 and publication date of September 4, 2018 discloses a snow blowing system for a snowplow, which relates to the field of special vehicle manufacturing technology; it includes a snow blower, which is respectively installed on both sides of the snowplow and is connected to a hydraulic motor and a hydraulic cylinder.

[0004] This invention can solve the problem of poor snow blowing effect.

[0005] While existing speed control methods can achieve speed regulation, the constant changes in motor operating pressure lead to unstable flow through the bypass oil circuit, making it impossible to guarantee motor speed regulation stability. Furthermore, when the motor operating pressure is high, the pressure difference across the bypass throttle valve increases simultaneously, resulting in energy waste and a rapid increase in the temperature of the hydraulic system. Utility Model Content

[0006] The present invention aims to provide an energy-saving speed-regulating hydraulic system for a snow blower that stabilizes the rotation speed and reduces energy loss.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: an energy-saving speed-regulating hydraulic system for a snow blower, comprising a housing, a nozzle disposed on the housing, and blades disposed inside the housing. A hydraulic motor for controlling the rotation of the blades is disposed inside the housing. An electro-proportional valve is connected to the oil inlet end of the hydraulic motor, and a hydraulic oil tank is connected to the oil return end of the hydraulic motor. A variable pump for maintaining pressure balance between the inlet and outlet ends of the electro-proportional valve is disposed between the hydraulic oil tank and the electro-proportional valve.

[0008] The variable pump includes a load-sensitive valve connected to an electro-proportional valve, and the variable pump also includes a variable cylinder connected to a hydraulic tank, with the load-sensitive valve connected to the variable cylinder.

[0009] The variable pump also includes a variable adjustment mechanism connected to the variable cylinder.

[0010] The variable adjustment mechanism is a cavity connected to the load-sensitive valve. The variable adjustment mechanism also includes a piston located in the cavity and connected to the piston in the variable cylinder via a seesaw structure.

[0011] The variable pump is equipped with a pressure shut-off valve connected to the variable adjustment mechanism.

[0012] A manual ball valve is provided between the variable pump and the hydraulic oil tank.

[0013] The hydraulic motor is equipped with a one-way valve for replenishing oil, which is connected to the hydraulic oil tank.

[0014] A return oil filter is provided between the hydraulic motor and the hydraulic oil tank.

[0015] The technical advantages of this invention are as follows: By introducing load-sensitive control into the hydraulic control circuit of the snow blower, the pressure difference across the electro-proportional valve is kept essentially constant. This ensures that the flow rate entering the hydraulic motor is only related to the opening of the electro-proportional valve and is not affected by load changes, making hydraulic motor speed adjustment more convenient and stable. The variable pump provides flow according to load changes, with no excess flow output, no overflow in the hydraulic system, and better energy-saving effect. Attached Figure Description

[0016] This manual includes the following figures, which illustrate the following:

[0017] Figure 1 This is a schematic diagram of the blade structure of an energy-saving speed-regulating hydraulic system for a snow blower according to the present invention.

[0018] Figure 2 for Figure 1 A schematic diagram of the hydraulic system of an energy-saving speed-regulating hydraulic system for a snow blower.

[0019] The following are labeled in the diagram: 1. Variable pump; 1.1. Variable cylinder; 1.2. Pressure shut-off valve; 1.3. Load-sensitive valve; 1.4. Variable adjustment mechanism; 2. Hydraulic motor; 2.1. Replenishment check valve; 3. Electro-proportional valve; 4. Return oil filter; 5. Hydraulic oil tank; 6. Manual ball valve. Detailed Implementation

[0020] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the utility model concept and technical solution, and to facilitate its implementation.

[0021] Please see Figure 1-2An energy-saving speed-regulating hydraulic system for a snow blower includes a housing, a nozzle mounted on the housing, and blades mounted inside the housing. A hydraulic motor 2, controlling the rotation of the blades, is located inside the housing. The inlet of the hydraulic motor 2 is connected to an electro-proportional valve 3, and the return end of the hydraulic motor 2 is connected to a hydraulic oil tank 5. A variable pump 1, maintaining pressure balance between the inlet and outlet of the electro-proportional valve 3, is installed between the hydraulic oil tank 5 and the electro-proportional valve 3. By introducing load-sensitive control into the hydraulic control circuit of the snow blower, the pressure difference across the electro-proportional valve 3 is kept essentially constant. This ensures that the flow rate entering the hydraulic motor 2 is only related to the opening of the electro-proportional valve 3 and is not affected by load changes. Speed ​​regulation of the hydraulic motor 2 is more convenient and stable. The variable pump 1 provides flow according to load changes, with no excess flow output. The hydraulic system has no overflow, resulting in better energy-saving performance.

[0022] The variable pump 1 includes a load-sensitive valve 1.3 connected to the electro-proportional valve 3, and a variable cylinder 1.1 connected to the hydraulic oil tank 5. The load-sensitive valve 1.3 is connected to the variable cylinder 1.1. The load-sensitive valve 1.3 is used for control in the hydraulic circuit. By simultaneously feeding back the working pressure of the hydraulic motor 2 and the output pressure of the variable pump 1 to the load-sensitive valve 1.3 of the variable pump 1, the two pressures are compared to ensure that the output pressure of the variable pump 1 is always higher than the system pressure by a fixed value. An electro-proportional valve 3 is installed in the oil inlet of the hydraulic motor 2, which introduces the output pressure of the variable pump 1 and the working pressure of the hydraulic motor 2 into the inlet and outlet of the electro-proportional valve 3, respectively. Thus, the pressure difference between the inlet and outlet of the electro-proportional valve 3 remains basically constant. The flow rate entering the hydraulic motor 2 of the snow blower is only related to the opening size of the electro-proportional valve 3 and is not affected by the load change of the hydraulic motor 2.

[0023] The variable pump 1 also includes a variable adjustment mechanism 1.4 connected to the variable cylinder 1.1; the variable adjustment mechanism 1.4 can adjust the swashplate angle in real time according to the change of the working pressure of the hydraulic motor 2, so that the output flow of the variable pump 1 is always adapted to the output pressure and the pressure is kept constant.

[0024] The variable adjustment mechanism 1.4 is a cavity connected to the load-sensitive valve 1.3. The variable adjustment mechanism 1.4 also includes a piston located in the cavity and connected to the piston inside the variable cylinder 1.1 via a seesaw structure. When oil is introduced, the coil of the electro-proportional valve 3 is de-energized, the piston rod of the variable cylinder 1.1 is fully extended, the displacement of the variable pump 1 is at its maximum, the system pressure gradually increases, the pressure at the right end of the load-sensitive valve 1.3 gradually increases, the right position gradually opens, the hydraulic oil enters the right cavity of the variable adjustment mechanism 1.4, pushing the piston of the variable cylinder 1.1 to gradually move to the right, the displacement of the variable pump 1 gradually decreases, and the output flow gradually decreases until there is no external output, only maintaining a low starting pressure to achieve the low-pressure standby function.

[0025] The variable pump 1 is equipped with a pressure shut-off valve 1.2 connected to the variable adjustment mechanism 1.4. When the system working pressure is too high, the right end of the pressure shut-off valve 1.2 in the variable pump 1 opens, oil enters the right chamber of the variable mechanism, pushes the piston of the variable cylinder 1.1 to move to the right, and the displacement of the variable pump 1 is reduced to the minimum, realizing the overpressure protection function.

[0026] A manual ball valve 6 is provided between the variable pump 1 and the hydraulic oil tank 5; it is used to switch the hydraulic oil tank 5 on and off.

[0027] The hydraulic motor 2 is equipped with a replenishing check valve 2.1 connected to the hydraulic oil tank 5; when the hydraulic motor 2 stops rotating, oil is replenished to the oil inlet side of the hydraulic motor 2 through the replenishing check valve 2.1.

[0028] A return oil filter 4 is installed between the hydraulic motor 2 and the hydraulic oil tank 5; it is used to filter the hydraulic oil coming out of the hydraulic motor 2, reduce the contamination of the hydraulic oil, and improve the service life of the hydraulic oil.

[0029] Working principle: The load-sensitive valve 1.3 is used for control in the hydraulic circuit. The working pressure of the hydraulic motor 2 and the output pressure of the variable pump 1 are simultaneously fed back to the load-sensitive valve 1.3 of the variable pump 1. The two pressures are compared to ensure that the output pressure of the variable pump 1 is always higher than the system pressure by a fixed value. An electro-proportional valve 3 is set in the oil inlet of the hydraulic motor 2, which introduces the output pressure of the variable pump 1 and the working pressure of the hydraulic motor 2 into the inlet and outlet of the electro-proportional valve 3, respectively. Thus, the pressure difference between the inlet and outlet of the electro-proportional valve 3 remains basically constant. The flow rate entering the hydraulic motor 2 of the snow blower is only related to the opening size of the electro-proportional valve 3 and is not affected by the load change of the hydraulic motor 2. At the same time, the variable adjustment mechanism 1.4 of the variable pump 1 will adjust the swashplate angle in real time according to the change of the working pressure of the hydraulic motor 2, so that the output flow rate of the variable pump 1 is always adapted to the output pressure.

[0030] Low-pressure, low-flow standby mode for the oil pump: Open the manual ball valve 66 to start the variable pump 1. The variable pump 1 draws oil from the hydraulic oil tank 55. The coil of the electro-proportional valve 3 is de-energized, the piston rod of the variable cylinder 1.1 is fully extended, the displacement of the variable pump 1 is at its maximum, and the system pressure gradually increases. The pressure at the right end of the load-sensitive valve 1.3 gradually increases, and the right position gradually opens. Hydraulic oil enters the right chamber of the variable adjustment mechanism 1.4, pushing the piston of the variable cylinder 1.1 to gradually move to the right. The displacement of the variable pump 1 gradually decreases, and the output flow gradually decreases until there is no external output, maintaining only a low starting pressure to achieve the low-pressure standby function.

[0031] Vane rotation: The oil pump is in low-pressure standby mode, the proportional solenoid of the electro-proportional valve 3 is energized, and hydraulic oil enters the hydraulic motor 2, causing it to begin rotating. The working pressure gradually increases, acting on the left end of the load-sensitive valve 1.3 through the LS port on the hydraulic motor 2. The pressure on the left end increases, the left-position opening increases, and pressurized oil enters the large chamber of the variable cylinder 1.1. The variable piston moves to the left, increasing the displacement to meet the speed requirements of the hydraulic motor 2. When the hydraulic motor 2 stops rotating, oil is replenished to the oil inlet side of the hydraulic motor 2 through the replenishment check valve 2.1.

[0032] Blade speed regulation: After the blades rotate, the current of the proportional electro-proportional valve 3 is changed, and the opening of the proportional valve 3 changes proportionally. The pressure of the variable pump 1 changes accordingly. The changing pressure acts on the right end of the load-sensitive valve 1.3, causing the valve core to move. Adjusting the left and right offset of the piston of the variable cylinder 1.1 changes the output flow of the variable pump 1, realizing the blade speed regulation function and achieving better energy saving effect.

[0033] Overpressure protection: When the system working pressure is too high, the right end of the pressure shut-off valve 1.2 in the variable pump 1 opens, oil enters the right chamber of the variable mechanism, pushes the piston of the variable cylinder 1.1 to move to the right, and the displacement of the variable pump 1 is reduced to the minimum, thus realizing the overpressure protection function.

[0034] The technical advantages of this invention are as follows: By introducing load-sensitive control into the hydraulic control circuit of the snow blower, the pressure difference across the electro-proportional valve 3 is kept essentially constant. This ensures that the flow rate entering the hydraulic motor 2 is only related to the opening of the electro-proportional valve 3 and is not affected by load changes, making speed adjustment of the hydraulic motor 2 more convenient and stable. The variable pump 1 provides flow according to load changes, with no excess flow output, no overflow in the hydraulic system, and better energy-saving effect.

[0035] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. An energy-saving speed-regulating hydraulic system for a snow blower, comprising a housing, a nozzle disposed on the housing, and blades disposed within the housing, wherein a hydraulic motor (2) for controlling the rotation of the blades is disposed within the housing, characterized in that: The hydraulic motor (2) is connected to an electro-proportional valve (3) at its inlet end, and to a hydraulic oil tank (5) at its return end. A variable pump (1) is provided between the hydraulic oil tank (5) and the electro-proportional valve (3) to maintain pressure balance between the inlet and outlet ends of the electro-proportional valve (3).

2. The energy-saving speed-regulating hydraulic system for a snow blower according to claim 1, characterized in that: The variable pump (1) includes a load-sensitive valve (1.3) connected to the electro-proportional valve (3), and the variable pump (1) also includes a variable cylinder (1.1) connected to the hydraulic oil tank (5). The load-sensitive valve (1.3) is connected to the variable cylinder (1.1).

3. The energy-saving speed-regulating hydraulic system for a snow blower according to claim 2, characterized in that: The variable pump (1) also includes a variable adjustment mechanism (1.4) connected to the variable cylinder (1.1).

4. The energy-saving speed-regulating hydraulic system for a snow blower according to claim 3, characterized in that: The variable adjustment mechanism (1.4) is a cavity connected to the load-sensitive valve (1.3). The variable adjustment mechanism (1.4) also includes a piston located in the cavity and connected to the piston in the variable cylinder (1.1) via a seesaw structure.

5. The energy-saving speed-regulating hydraulic system for a snow blower according to claim 3, characterized in that: The variable pump (1) is equipped with a pressure shut-off valve (1.2) connected to the variable adjustment mechanism (1.4).

6. The energy-saving speed-regulating hydraulic system for a snow blower according to claim 1, characterized in that: A manual ball valve (6) is provided between the variable pump (1) and the hydraulic oil tank (5).

7. The energy-saving speed-regulating hydraulic system for a snow blower according to claim 1, characterized in that: The hydraulic motor (2) is equipped with a replenishing check valve (2.1) connected to the hydraulic oil tank (5).

8. The energy-saving speed-regulating hydraulic system for a snow blower according to claim 1 or 2, characterized in that: A return oil filter (4) is provided between the hydraulic motor (2) and the hydraulic oil tank (5).

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