Hydraulic control device of snow removal accessory

Abstract

The utility model discloses a hydraulic control device for snow removal accessories, which relates to the field of hydraulic control of snow removal machinery and comprises a hydraulic oil tank and a hydraulic pump. A lifting oil cylinder control loop and a floating control loop are arranged on the oil inlet pipeline behind the overflow valve in parallel, an electric proportional pressure reducing valve is connected in the floating control loop, and the electric proportional pressure reducing valve is further connected with the oil outlet pipeline. Compared with the prior art, the lifting oil cylinder control loop and the floating control loop are arranged on the upper oil inlet pipeline of the hydraulic system of the snow removal accessory in parallel, the electric proportional pressure reducing valve is connected in the floating control loop, and under the condition that the lifting oil cylinder control loop does not act, the floating control reversing valve is opened, and the electric proportional pressure reducing valve is opened. And a fixed current value is given to the electric proportional pressure reducing valve, so that the floating control loop is opened, and different current values are provided for the electric proportional pressure reducing valve, so that different grounding pressure adjustment is realized.

Description

Technical Field

[0001] The utility model relates to the field of hydraulic control of snow removal machinery, in particular to a hydraulic control device for snow removal accessories. Background Art

[0002] The mainstream snowplows on the market are mainly used for snow removal on urban roads, highways and airport runways. Snowplows are required to have a high ability to protect paved roads. At present, the requirements for snow removal efficiency are getting higher and higher, and snow removal equipment is becoming faster and larger. Therefore, snow removal equipment with auger and roller brush needs to maintain a certain fit between the auger, roller brush and the ground during the snow removal operation in order to clear the snow on the ground; when the snow removal equipment is moving, it will encounter undulating roads, and the auger and roller brush need to follow the undulations of the ground to avoid damaging the auger, roller brush or paved road surface. In the prior art, a hydraulic system is generally used to control the lifting and lowering of the roller brush and the auger, but the existing hydraulic system has the problem that the ground pressure of the accessories cannot be adjusted dynamically, which is easy to cause damage to the road surface. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a hydraulic control device for snow removal accessories which can always maintain ground pressure according to a set pressure, thereby ensuring the cleanness of snow removal and preventing the weight of the accessories from being excessively loaded onto the ground and causing damage to the road surface.

[0004] In order to solve the above problems, the technical solution adopted by the utility model is: it includes a hydraulic oil tank and a hydraulic pump, an oil inlet pipeline connected to the hydraulic pump, and an oil pressure filter and an overflow valve are sequentially provided on the oil inlet pipeline section behind the hydraulic pump according to the running direction of the oil circuit, and a lifting cylinder control circuit and a floating control circuit are arranged in parallel on the oil inlet pipeline behind the overflow valve, an electric proportional pressure reducing valve is connected to the floating control circuit, and the electric proportional pressure reducing valve is also connected to the oil outlet pipeline.

[0005] In the above technical solution, a more specific solution may also be: the floating control circuit includes the electric proportional pressure reducing valve and a first electric control stop valve, the first electric control stop valve is connected to the second electric control stop valve and then connected to the rod chamber of the lifting hydraulic cylinder.

[0006] Further: the lifting cylinder control circuit includes a three-position four-way reversing valve and a one-way throttle valve group, the pressure oil port P of the three-position four-way reversing valve is connected to the oil inlet pipeline, and the oil inlet pipeline is connected to the oil inlet pipeline section in front of the electric proportional pressure reducing valve, the working oil port A of the three-position four-way reversing valve is connected to the rodless chamber of the lifting hydraulic cylinder after passing through the one-way throttle valve group; the working oil port B of the three-position four-way reversing valve is connected in sequence to the one-way throttle valve group and the second electrically controlled stop valve and then connected to the rod chamber of the lifting hydraulic cylinder.

[0007] Furthermore: the overflow valve is also connected to the oil outlet pipeline.

[0008] Further: a throttle valve is provided between the second electrically controlled stop valve and the electrically controlled stop valve.

[0009] Furthermore: the three-position four-way reversing valve is also connected to the oil outlet pipeline.

[0010] Due to the adoption of the above technical solution, the utility model has the following beneficial effects compared with the prior art:

[0011] 1. In the present invention, a lifting cylinder control circuit and a floating control circuit are arranged in parallel on the oil inlet pipeline of the hydraulic system of the snow removal equipment. An electric proportional pressure reducing valve is connected in the floating control circuit. When the lifting cylinder control circuit is not in action, the floating control reversing valve is opened, and a fixed current value is given to the electric proportional pressure reducing valve to realize the opening of the floating control circuit, and different current values ​​are provided to the electric proportional pressure reducing valve to realize different ground pressure adjustments.

[0012] 2. An electric stop valve and a one-way throttle valve group are added to the lifting hydraulic cylinder. The electric stop valve is used to lock the oil in the cylinder and control the opening and closing of the floating function of the accessories. The one-way throttle valve group is set to realize two-way speed control of the lifting cylinder circuit; the setting of the two components and the use of the electric proportional pressure reducing valve can realize the floating control of the ground pressure of the operating accessories. No matter how bumpy the road surface is, the system can always maintain the ground pressure according to the set pressure, which not only ensures the cleanliness of snow removal, but also avoids excessive loading of the weight of the accessories to the ground, causing damage to the road surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model.

[0014] Serial number description:

[0015] 1. Hydraulic oil tank; 2. Hydraulic pump; 3. Oil pressure filter; 4. Overflow valve; 5. Electric proportional pressure reducing valve; 6. First electric control stop valve; 7. Throttle valve; 8. Second electric control stop valve; 9. Lifting hydraulic cylinder; 10. One-way throttle valve group; 11. Three-position four-way reversing valve; 12. Oil inlet pipeline; 13. Oil outlet pipeline. DETAILED DESCRIPTION

[0016] In order to make the above-mentioned purposes, features and advantages of the utility model easier to understand, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. In the following description, many specific details are set forth in order to fully understand the utility model, but the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0017] In the present invention, unless otherwise clearly defined and limited, the terms "installation", "connection", "fixation" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0018] like Figure 1 The hydraulic control system of the snow removal accessories shown in the figure includes a hydraulic oil tank 1 and a hydraulic pump 2, an oil inlet pipeline 12 connected to the hydraulic pump, and an oil pressure filter 3 and an overflow valve 4 are sequentially arranged on the oil inlet pipeline section behind the hydraulic pump 2 according to the direction of the oil circuit. A lifting cylinder control circuit and a floating control circuit are arranged in parallel on the oil inlet pipeline behind the overflow valve 4. The floating control circuit includes an electric proportional pressure reducing valve 5 and a first electric control stop valve 6. The first electric control stop valve 6 is connected to the second electric control stop valve 8 and then to the rod chamber of the lifting hydraulic cylinder 9; the lifting cylinder control circuit includes a three-position four-way reversing valve 11 and a one-way throttle valve group 10. The one-way throttle valve group 10 can be controlled by throttling in one direction in both oil circuits. The pressure of the three-position four-way reversing valve 11 The force oil port P is connected to the oil inlet pipeline, which is connected to the oil inlet pipeline section in front of the electric proportional pressure reducing valve 5. The working oil port A of the three-position four-way reversing valve 11 is connected to the rodless chamber of the lifting hydraulic cylinder after passing through the one-way throttle valve group 10; the working oil port B of the three-position four-way reversing valve 11 is connected in sequence with the one-way throttle valve group 10 and the rod chamber of the lifting hydraulic cylinder 9 after connecting to the second electric control stop valve 8, and the return oil port T of the three-position four-way reversing valve 11 is connected to the hydraulic oil tank 1 through the return oil pipeline 13; the overflow valve 4 is also connected to the oil outlet pipeline 13, a throttle valve 7 is provided between the first electric control stop valve 6 and the second electric control stop valve 8, the electric proportional pressure reducing valve 5 is also connected to the oil outlet pipeline, and the three-position four-way reversing valve 11 is also connected to the oil outlet pipeline 13.

[0019] When the snow removal equipment is operated after or before the operation is completed, the first electrically controlled stop valve 6 is closed and the second electrically controlled stop valve 8 is opened. The operator controls the three-position four-way reversing valve 11 and the one-way throttle valve group to pump oil into the rodless chamber and the rod chamber of the lifting cylinder to achieve the lifting and lowering and lifting speed control of the snow removal accessories, so as to lift the snow removal accessories off the ground after the operation of the snow removal equipment is completed or lower the snow removal accessories to fit the snow removal accessories to the ground before the operation of the snow removal equipment begins.

[0020] When the snow removal equipment is working, the first electric control stop valve 6 and the second electric control stop valve 8 are electrically connected, and the three-position four-way reversing valve 11 is not electrically connected; the hydraulic pump 2 pumps the hydraulic oil into the oil inlet pipeline 12, and the hydraulic oil passes through the oil pressure filter 3, the electric proportional pressure reducing valve 5, the first electric control stop valve 6, the throttle valve 7 and the second electric control stop valve 8 in sequence and then enters the rod chamber of the lifting hydraulic cylinder. By adjusting the multi-position potentiometer installed in the cab, the input electric signal current of the electric proportional pressure reducing valve 5 is adjusted to control its output hydraulic pressure, which is used to reduce the adhesion of the snow removal accessories to the ground. When the snow removal equipment encounters a sunken road surface during travel, the snow removal accessories such as the auger or the roller brush squeeze the telescopic rod of the lifting hydraulic cylinder 9, causing the oil pressure in the rod chamber of the lifting hydraulic cylinder 9 to rise and exceed the given pressure. Part of the hydraulic oil returns to the hydraulic oil tank from the oil outlet pipeline 13 through the overflow function of the electric proportional pressure reducing valve 5 through the oil return port, thereby reducing the pressure in the rod chamber of the lifting hydraulic cylinder to the given pressure. When the snow removal equipment encounters a raised road surface during its movement, the telescopic rod of the lifting hydraulic cylinder 9 extends outward, the pressure drops and the given pressure of the electric proportional pressure reducing valve 5 is reduced. At this time, the hydraulic oil in the oil inlet pipe 12 automatically enters the rod chamber of the lifting hydraulic cylinder through the electric proportional pressure reducing valve 5, and the oil pressure in the rod chamber of the lifting hydraulic cylinder is increased to the given pressure again, thereby restoring the contact force of the snow removal equipment with the ground.

Claims

1. A hydraulic control device for snow removal attachments, comprising a hydraulic oil tank (1) and a hydraulic pump (2), an oil inlet pipeline (12) connected to the hydraulic pump, and an oil pressure filter (3) and a relief valve (4) are sequentially arranged on the oil inlet pipeline section after the hydraulic pump (2) in the direction of the oil circuit, characterized in that: A lifting cylinder control circuit and a floating control circuit are arranged in parallel on the oil inlet pipeline behind the overflow valve (4); an electric proportional pressure reducing valve (5) is connected to the floating control circuit; and the electric proportional pressure reducing valve (5) is also connected to the oil outlet pipeline.

2. The hydraulic control device for snow removal attachment according to claim 1, characterized in that: The floating control circuit comprises the electric proportional pressure reducing valve (5) and a first electric control stop valve (6), wherein the first electric control stop valve (6) is connected to a second electric control stop valve (8) and then to a rod chamber of a lifting hydraulic cylinder (9).

3. The hydraulic control device for snow removal attachment according to claim 2, characterized in that: The lifting cylinder control circuit comprises a three-position four-way reversing valve (11) and a one-way throttle valve group (10); the pressure oil port P of the three-position four-way reversing valve (11) is connected to the oil inlet pipeline, and the oil inlet pipeline is connected to the oil inlet pipeline section before the electric proportional pressure reducing valve (5); the working oil port A of the three-position four-way reversing valve (11) is connected to the rodless chamber of the lifting hydraulic cylinder after passing through the one-way throttle valve group (10); the working oil port B of the three-position four-way reversing valve (11) is connected in sequence to the one-way throttle valve group (10) and the second electric control stop valve (8) and then connected to the rod chamber of the lifting hydraulic cylinder (9).

4. The hydraulic control device for snow removal attachment according to claim 2 or 3, characterized in that: The overflow valve (4) is also connected to the oil outlet pipeline (13).

5. The hydraulic control device for snow removal attachment according to claim 4, characterized in that: A throttle valve (7) is provided between the first electrically controlled stop valve (6) and the second electrically controlled stop valve (8).

6. The hydraulic control device for snow removal attachment according to claim 3, characterized in that: The three-position four-way reversing valve (11) is also connected to the oil outlet pipeline (13).

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