Hydraulic pressure and obstacle avoidance control system for the belly blade of snowplow

Abstract

The present invention belongs to the field of hydraulic control technology, and in particular, relates to a hydraulic downward pressure and obstacle avoidance control system for a belly shovel of a snowplow, which is characterized in that it includes an electric motor, a hydraulic control device connected to the electric motor, the hydraulic control device includes a cartridge valve group, an accumulator connected to the cartridge valve group, and a lifting cylinder connected to the cartridge valve group and the accumulator respectively, the cartridge valve group includes a pressure relief valve, a one-way valve connected in series with the pressure relief valve, a differential relief valve connected in parallel with the pressure relief valve and the one-way valve, a start valve connected to a rod chamber of the lifting cylinder, and a plunger rod connected in parallel with the start valve and controlling the overflow of the differential relief valve. The present invention is simple to operate, and the pressure on the ground when the belly shovel is pressed down is controllable, and the downward pressure will not continue to increase after reaching the adjustment pressure, and the relative pressure between the belly shovel and the ground will not be too large to cause damage to the ground.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic control, and in particular relates to a hydraulic downward pressure and obstacle avoidance control system for a belly shovel of a snowplow. Background Art

[0002] A belly shovel is a snowplow installed between the front and rear axles of a heavy-duty vehicle (truck or dump truck). The vehicle moves forward while the snowplow is pressing down, compacting the ground and pushing the snow and ice to the roadside at a certain angle. In the prior art, the ground pressure and obstacle avoidance of the belly shovel of such snowplow vehicles during snow removal are generally achieved through mechanical structures. Due to the limited mechanical obstacle avoidance range and the large force variation, the operation is not intuitive, the controllability of the ground pressure is poor, the snow removal effect is not ideal, and excessive downward pressure will damage the road surface. Summary of the invention

[0003] The purpose of the present invention is to provide a hydraulic downward pressure and obstacle avoidance control system for a snowplow belly shovel, which can intuitively display the ground pressure during snow removal and is simple to operate. The ground pressure is adjustable and the road damage caused by excessive downward pressure can be solved.

[0004] The objective of the present invention is achieved through the following technical solutions:

[0005] The hydraulic pressure-down and obstacle avoidance control system of the belly shovel of a snowplow of the present invention is characterized in that it includes an electric motor, a hydraulic control device connected to the electric motor, the hydraulic control device includes a cartridge valve group, an accumulator connected to the cartridge valve group, and a lifting cylinder connected to the cartridge valve group and the accumulator, respectively.

[0006] The cartridge valve group includes a pressure reducing relief valve, a one-way valve connected in series with the pressure reducing relief valve, a differential relief valve connected in parallel with the pressure reducing relief valve and the one-way valve, a starting valve connected to the rod chamber of the lifting cylinder, and a plunger connected in parallel with the starting valve and controlling the overflow of the differential relief valve.

[0007] The accumulator is connected in parallel with the rodless chamber of the lifting cylinder.

[0008] The differential relief valve is connected in parallel with the rodless chamber of the lifting cylinder.

[0009] Advantages of the present invention:

[0010] (1) The hydraulic downward pressure and obstacle avoidance control system of the belly scoop of the snowplow of the present invention is easy to operate. The pressure on the ground when the belly scoop is pressed down is controllable. After the downward pressure reaches the adjusted pressure, it will not continue to increase, and the relative pressure between the belly scoop and the ground will not be too large to cause damage to the ground.

[0011] (2) The hydraulic downward pressure and obstacle avoidance control system of the belly scoop of the snowplow of the present invention can safely and controllably change with the ground pressure during operation. The accumulator can quickly respond to the pressure change without damaging the road surface. When the working pressure exceeds the controllable pressure, the hydraulic oil is actively unloaded without damaging the system and the belly scoop structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0013] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings.

[0014] like Figure 1 As shown, the hydraulic downward pressure and obstacle avoidance control system of the belly shovel of the snowplow of the present invention is characterized by comprising an electric motor, a hydraulic control device connected to the electric motor, the hydraulic control device comprising a cartridge valve group, an accumulator 1 connected to the cartridge valve group, a lifting cylinder 2 connected to the cartridge valve group and the accumulator 1 respectively,

[0015] The cartridge valve group includes a pressure relief valve 3, a check valve 5 connected in series with the pressure relief valve 3, a differential relief valve 4 connected in parallel with the pressure relief valve 3 and the check valve 5, a start valve 6 connected to the rod chamber of the lifting cylinder 2, and a plunger 7 connected in parallel with the start valve 6 and controlling the overflow of the differential relief valve 4. The plunger 7 is connected in parallel with the start valve 6 and controls the overflow of the differential relief valve 4, so that the belly shovel can achieve the rising action.

[0016] The accumulator 1 is connected in parallel with the rodless chamber of the lifting cylinder 2 .

[0017] The differential relief valve 4 is connected in parallel with the rodless chamber of the lifting cylinder 2 .

[0018] The working process of the hydraulic pressure down and obstacle avoidance control system of the snow removal vehicle belly shovel of the present invention is as follows:

[0019] Before snow removal, move the belly shovel to the working state (press down after the belly shovel swings a certain angle). When pressing down, the start valve 6 is energized, and the pressure oil enters the system from the valve A port group. The hydraulic oil passes through the pressure reducing relief valve 3 and the one-way valve 5 at the set pressure P1 to enter the rodless chamber of the belly shovel cylinder 2 and the accumulator 1. At this time, due to the deadweight of the belly shovel, the hydraulic oil will first enter the rodless chamber of the cylinder 2. When the belly shovel contacts the ground and is supported by the ground, the hydraulic oil will fill the accumulator 1. At this time, the pressure of the belly shovel on the ground will gradually increase until it reaches the pressure P1 set by the pressure reducing relief valve 3. The pressure will no longer increase, and the excess hydraulic oil will overflow back to the system return oil pipeline through the pressure reducing relief valve 3. At this time, the belly shovel position reaches the working state (at this time, there is no need to continue to press down, the power source motor stops working, and the start valve 6 valve head is kept energized);

[0020] When the snowplow starts to drive the belly shovel to clear snow, there will be obstacles on the ground that are uneven or suddenly raised. When the ground rises, the belly shovel blade is squeezed by the increased reverse force of the ground and the oil cylinder 2 is squeezed, the piston rod of the oil cylinder retracts, the stroke decreases, and part of the oil in the rodless chamber enters the accumulator 1, the energy is stored, and the system pressure temporarily increases, but the maximum pressure will not exceed the system's maximum design pressure P2; when the snowplow passes the raised position, the ground height drops, the accumulator 1 releases its stored energy, the oil is replenished to the rodless chamber of the oil cylinder 2, the piston rod extends, the stroke is reset, and the working pressure is restored to P1 at this time, and the snow shoveling continues; the same applies when the ground is low.

[0021] When snow removal is completed and the belly shovel rises back to the transport state, the pressure oil enters the system from the valve B port group to start valve 6, and the hydraulic oil enters the rod chamber of the oil cylinder 2. At the same time, pressure is applied to the plunger 7, and the plunger 7 pushes open the differential relief valve 4, so that the hydraulic oil in the rodless chamber of the oil cylinder 2 returns to the A port through the differential relief valve 4.

[0022] This makes snow removal simple to operate, and allows for controllable working pressure when avoiding obstacles without damaging the road surface.

Claims

1. A hydraulic pressure and obstacle avoidance control system for a snowplow belly shovel, characterized in that The invention comprises an electric motor, a hydraulic control device connected to the electric motor, the hydraulic control device comprises a cartridge valve group, an accumulator connected to the cartridge valve group, and a lifting cylinder connected to the cartridge valve group and the accumulator respectively. The cartridge valve group includes a pressure reducing relief valve, a one-way valve connected in series with the pressure reducing relief valve, a differential relief valve connected in parallel with the pressure reducing relief valve and the one-way valve, a start valve connected to the rod chamber of the lifting oil cylinder, a plunger connected in parallel with the start valve and controlling the overflow of the differential relief valve, The accumulator is connected in parallel with the rodless chamber of the lifting cylinder. The differential relief valve is connected in parallel with the rodless chamber of the lifting cylinder. Before snow removal, move the belly shovel to the working state. When pressing down, the start valve is energized, and the pressure oil enters the system from the valve A port group. The hydraulic oil passes through the pressure reducing relief valve and the one-way valve at the set pressure P1 to enter the rodless chamber of the belly shovel cylinder and the accumulator. At this time, due to the deadweight of the belly shovel, the hydraulic oil will first enter the rodless chamber of the cylinder. When the belly shovel contacts the ground and is supported by the ground, the hydraulic oil will fill the accumulator. At this time, the pressure of the belly shovel on the ground will gradually increase until it reaches the pressure P1 set by the pressure reducing relief valve. The pressure will no longer increase, and the excess hydraulic oil will overflow back to the system return oil pipeline through the pressure reducing relief valve. At this time, the belly shovel position reaches the working state; When the snow removal is completed and the belly shovel rises back to the transfer state, the pressure oil enters the system start valve from the valve B port group to be energized, and the hydraulic oil enters the rod chamber of the cylinder. At the same time, pressure is applied to the plunger, and the plunger pushes open the differential relief valve, allowing the hydraulic oil in the rodless chamber of the cylinder to return to port A through the differential relief valve.

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