High-speed obstacle-avoiding pre-snow-removal device

Abstract

The present application relates to the technical field of highway maintenance equipment, and particularly relates to a high-speed obstacle-avoiding front snow removing device, which comprises an arc-shaped shovel body, a swing pivot, an asymmetric buffer bushing, a stroke amplification mechanism, a control valve, an accumulator and a lifting oil cylinder. The swing pivot is connected with the arc-shaped shovel body through the asymmetric buffer bushing and is used for converting horizontal impact into radial displacement; the stroke amplification mechanism captures the displacement signal and amplifies the signal to trigger the control valve. When the shovel body encounters high-speed impact, the control valve instantaneously opens a pressure relief flow channel, so that the oil in the lifting oil cylinder is rapidly discharged into the accumulator, and the accumulator is used for guiding the oil cylinder to stably follow the retraction by using the volume absorption characteristics of the accumulator. Through the linkage mechanism of displacement capture, mechanical amplification and hydraulic unloading, the present application effectively solves the problems of obstacle-avoiding response lag under high-speed working conditions and pipeline burst caused by instantaneous pressure increase of the hydraulic system, and significantly improves the structural safety and sensitivity of the equipment under high-load operation.

Description

Technical Field

[0001] This invention relates to the field of highway maintenance equipment technology, specifically to a high-speed, obstacle-avoiding, front-mounted snow removal device. Background Technology

[0002] With the rapid development of my country's transportation infrastructure, winter snow removal operations on highways and urban expressways place higher demands on the forward operation speed and safe obstacle avoidance capabilities of equipment. Traditional front-mounted snow removal devices typically use a hydraulic lifting structure and mechanical connection frame to mount the snowplow body to the front of a heavy-duty vehicle for efficient snow removal. In actual high-speed operating environments, due to complex road conditions, the snowplow body is highly susceptible to sudden impacts from hard obstacles at high speeds, and existing obstacle avoidance mechanisms and hydraulic protection systems still face significant technical bottlenecks in dealing with such conditions.

[0003] Its main drawbacks are: Firstly, traditional obstacle avoidance systems often use an integral blade flipping or a large-stroke spring support structure. Such designs provide a certain degree of protection when operating at low speeds, but at high speeds, the mechanical components have huge inertia and slow response. The impact force is often transmitted to the connecting frame and vehicle chassis before the obstacle avoidance action is performed, causing rigid damage to the main structure.

[0004] Secondly, due to the incompressibility of hydraulic oil, when the snowplow is subjected to a violent impact, forcing the lifting cylinder to retract, the internal pressure of the closed hydraulic circuit will experience a sudden and explosive increase. Existing pressure relief methods are usually unable to provide sufficient relief space within microseconds, resulting in system pressure peaks far exceeding pipeline loads, which can easily lead to hydraulic component rupture or seal failure. More seriously, because the pressure cannot be released smoothly, the lifting cylinder will generate extremely strong damping resistance, preventing the snowplow from achieving effective "follow-up retraction," thus causing overall equipment damage. Summary of the Invention

[0005] Therefore, it is necessary to provide a high-speed, obstacle-avoiding, front-mounted snow removal device to address the problems of existing technologies.

[0006] To address the problems of existing technologies, the present invention adopts the following technical solution: a high-speed obstacle-avoiding front-mounted snow removal device, comprising a connecting base, a swing shaft connected to the connecting base via a connecting frame, an arc-shaped shovel body supported by the swing shaft, and a lifting cylinder for driving the connecting frame to rise and fall, and further comprising: An asymmetric buffer bushing is provided in the connection between the swing shaft and the connecting frame. The asymmetric buffer bushing has a non-uniformly distributed thick-walled buffer part and thin-walled part along the circumferential direction. The thick-walled buffer part corresponds to the direction of the horizontal impact force on the arc-shaped shovel body. It is used to make the swing shaft generate radial displacement by the radial deformation of the thick-walled buffer part when the arc-shaped shovel body is subjected to the collision force. The stroke amplification mechanism is connected to the swing shaft drive and is used to sense the small radial displacement generated by the swing shaft relative to the arc-shaped shovel body and amplify and output the displacement. An accumulator, connected to the connecting base, is used to absorb and temporarily store the oil discharged by the lifting cylinder during obstacle avoidance. The control valve includes a valve body and a valve core. The valve body has a pressure relief passage that connects the accumulator and the lifting cylinder. The pressure relief passage is normally closed. The valve core is activated by the output end of the stroke amplification mechanism to open the pressure relief passage when the swing shaft generates radial displacement.

[0007] Furthermore, the connecting frame includes an upper triangular frame and a lower triangular frame that are hinged to the connecting base. One end of the upper triangular frame and the lower triangular frame is hinged to a cross sleeve. The swing shaft is located between the upper triangular frame and the lower triangular frame, and both ends of the swing shaft are rotatably connected to the two cross sleeves respectively. The asymmetric buffer bushing is located between the swing shaft and the cross sleeve.

[0008] Furthermore, the valve body is fixedly connected to one of the cross sleeves via a mounting bracket. The valve body has a columnar groove extending along its own axial direction, and both ends of the valve body are closed structures. The valve core includes a first piston head, a second piston head, and a piston rod connecting the two. The first piston head and the second piston head slide in the columnar groove in a sealed manner, and an annular flow groove is formed between them. One end of the piston rod extends outward from the second piston head through the valve body to form a trigger end that cooperates with the stroke amplification mechanism. The outer wall of the valve body has a first oil port and a second oil port arranged symmetrically. The annular flow groove, the first oil port, and the second oil port together constitute the pressure relief flow channel.

[0009] Furthermore, the control valve also includes a return spring, which is disposed in the columnar groove and abuts against the first piston head to drive the piston rod to extend outward. When the second piston head abuts against the inner wall of the valve body, the piston rod reaches its maximum extension stroke, and the circumferential side of the second piston head simultaneously blocks the first oil port and the second oil port.

[0010] Furthermore, the side of the second piston head away from the first piston head and the closed end of the valve body form a pressure-holding cavity. A guide hole is provided inside the second piston head to pass through its two end faces. The annular flow groove is connected to the pressure-holding cavity through the guide hole.

[0011] Furthermore, the stroke amplification mechanism includes a collar and a lever. The collar is coaxially sleeved on the swing shaft. The lever is located above the valve body and is rotatably connected to the mounting bracket via a fulcrum shaft. The fulcrum shaft is close to the swing shaft so that the two ends of the lever respectively form a short lever extending towards the swing shaft and a long lever extending towards the valve body. A strip-shaped groove is formed in the short lever along its length direction. An actuating pin is formed on the outer wall of the collar and passes through the strip-shaped groove. A roller is connected to the extended end of the piston rod, and the long lever abuts against the roller downwards.

[0012] Furthermore, a floating module is connected to the swing shaft, a support beam is installed on the floating module, the arc-shaped shovel is hinged to the support beam, and several connecting strips are provided between the two to limit the forward tilt angle of the arc-shaped shovel.

[0013] Furthermore, two swing cylinders symmetrical about the swing axis are installed on the connecting base, and the output end of the swing cylinder is hinged to the supporting crossbeam.

[0014] Furthermore, the bottom of the arc-shaped shovel body is provided with several movable shovel blades arranged in parallel along its length direction. The upper end of the movable shovel blades is hinged to the arc-shaped shovel body, and a torsion spring is provided at the hinge point to keep the movable shovel blades in an inclined state.

[0015] Furthermore, the lifting cylinder is connected to a first pipeline and a second pipeline. The first pipeline is equipped with a one-way valve that supplies oil only to the lifting cylinder. The section of the first pipeline between the one-way valve and the lifting cylinder is connected to the first port of the control valve via a branch oil line. The second port of the control valve is connected to the accumulator. The second pipeline is connected to a high-pressure pipeline that leads to the one-way valve and is opened by oil pressure.

[0016] The beneficial effects of this invention compared to the prior art are: This invention achieves flexible conversion and efficient pressure relief of impact kinetic energy in high-speed operating environments through an asymmetric buffer bushing, a stroke amplification mechanism, an accumulator, and a control valve. Specifically, the asymmetric buffer bushing converts rigid impact into a small radial displacement of the swing shaft, and the stroke amplification mechanism sensitively captures and amplifies this displacement signal, thereby instantaneously triggering the control valve to open the pressure relief channel and guide the oil in the lifting cylinder to be rapidly discharged to the accumulator. This mechanism effectively solves the problems of high-speed impact response lag and instantaneous pressure surge caused by the incompressibility of hydraulic oil in existing technologies. While effectively preventing hydraulic pipeline rupture and mechanical structural component damage, it ensures that the lifting cylinder can retract to avoid obstacles, significantly improving the structural safety and obstacle avoidance sensitivity of the device in complex high-speed snow removal environments. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 It is a three-dimensional structural diagram of the connection base, the swing axis and the supporting beam; Figure 3 This is a plan view of the connecting base, the swing pivot, and the supporting beam; Figure 4 This is a schematic diagram of the three-dimensional structure of the arc-shaped shovel. Figure 5 This is a three-dimensional structural diagram of the stroke amplification mechanism and the control valve; Figure 6 yes Figure 5 A magnified view of the area indicated by A1 in the diagram; Figure 7 yes Figure 5 The enlarged view of the area indicated by A2 in the diagram; Figure 8 This is a plan view of the stroke amplification mechanism and the control valve; Figure 9 It is a three-dimensional sectional view of the control valve when the pressure relief channel is blocked; Figure 10 It is a three-dimensional cross-sectional view of the control valve when the pressure relief channel is open; Figure 11 This is a schematic diagram of the hydraulic circuit when the lifting cylinder is normally extended; Figure 12 This is a schematic diagram of the hydraulic circuit when the lifting cylinder is retracting normally; Figure 13 This is a schematic diagram of the hydraulic circuit when the lifting cylinder retracts under pressure; Figure 14 This is a schematic diagram of the oil circuit when the accumulator releases energy.

[0018] The following are the labels in the diagram: 1. Connecting base; 2. Swinging shaft; 3. Arc-shaped shovel body; 4. Lifting cylinder; 5. Asymmetric buffer bushing; 6. Thick-walled buffer section; 7. Thin-walled section; 8. Accumulator; 9. Valve body; 10. Valve core; 11. Upper triangular bracket; 12. Lower triangular bracket; 13. Cross sleeve; 14. Mounting bracket; 15. Columnar groove; 16. First piston head; 17. Second piston head; 18. Piston rod; 19. First oil port; 20. Second oil port; 21. Compound... 22. Position spring; 23. Pressure holding chamber; 24. Guide hole; 25. Collar; 26. Lever; 27. Pivot shaft; 28. Strip groove; 29. ​​Actuating pin; 30. Roller; 31. Floating module; 32. Support beam; 33. Connecting bar; 34. Swing cylinder; 35. Movable shovel blade; 36. Torsion spring; 37. First pipeline; 38. Second pipeline; 39. Check valve; 40. Branch oil circuit; 41. High pressure pipeline; 42. Annular flow groove; 43. Control valve. Detailed Implementation

[0019] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0020] refer to Figures 1 to 14 The device shown is a high-speed obstacle-avoiding front snow removal device. The device includes a connecting base 1, which is connected to a swing shaft 2 via a connecting frame. The swing shaft 2 is equipped with an arc-shaped shovel 3. The connecting base 1 is equipped with a lifting cylinder 4 for driving the lifting of the connecting frame. The height or working state of the arc-shaped shovel 3 relative to the ground is controlled by the extension and retraction of the lifting cylinder 4 to adapt to different road cleaning needs.

[0021] When further constructing the connecting frame structure, the overall frame's stress balance was considered, such as... Figures 1 to 3 As shown, the connecting frame specifically includes an upper triangular frame 11 and a lower triangular frame 12 hinged to the connecting base 1. A cross sleeve 13 is hinged to the front end of both the upper triangular frame 11 and the lower triangular frame 12. To enable the above frame structure to have vertical driving power, the cylinder body of the lifting cylinder 4 is connected to the connecting base 1, and its output end is hinged to the lower triangular frame 12. By extending or retracting the piston rod 18 of the lifting cylinder 4, the lower triangular frame 12 is driven to rotate around its hinge point with the connecting base 1, thereby driving the entire connecting frame and the arc-shaped shovel body 3 to complete the lifting action.

[0022] To ensure that the curved shovel body 3 retains flexible adjustability while bearing a huge load, such as Figure 2 and Figure 3As shown, the swing shaft 2 is vertically positioned between the upper triangular frame 11 and the lower triangular frame 12, and the top and bottom ends of the swing shaft 2 are rotatably connected to the two cross sleeves 13 respectively. This design allows the swing shaft 2 to not only bear the weight of the arc-shaped shovel body 3, but also to utilize the rotational freedom provided by the cross sleeves 13 to allow the arc-shaped shovel body 3 to achieve a certain angle of deflection adjustment in the horizontal plane.

[0023] To improve the adaptability of the curved shovel body 3 to complex road surfaces, such as Figure 1 As shown, during the actual assembly process, a floating module 30 is connected to the swing shaft 2. A support beam 31 is installed on the floating module 30. The arc-shaped shovel body 3 is connected to the support beam 31 by a hinge. Several connecting strips 32 are provided between the arc-shaped shovel body 3 and the support beam 31 to limit the forward tilt angle of the arc-shaped shovel body 3. These connecting strips 32 can ensure that the arc-shaped shovel body 3 maintains a stable snow throwing angle during operation.

[0024] Considering the requirements for different snow removal angles during snow removal operations, such as Figure 1 and Figure 2 As shown, two swing cylinders 33 are also installed on the connecting base 1, which are symmetrically distributed about the swing shaft 2. The output end of the swing cylinder 33 is hinged to the support beam 31. By alternating extension and retraction of the two swing cylinders 33, the support beam 31 can be driven to rotate around the swing shaft 2, thereby changing the tilt direction of the arc-shaped shovel body 3 to adapt to the need for snow removal to the left or right.

[0025] In terms of overcoming small obstacles on the road, such as Figure 1 and Figure 4 As shown, several movable blades 34 are arranged side by side along the length of the bottom of the arc-shaped shovel body 3. The upper end of the movable blades 34 is hinged to the arc-shaped shovel body 3, and a torsion spring 35 is provided at the hinge to keep the movable blades 34 in an inclined state. When encountering a small protruding obstacle, the movable blades 34 can overcome the elastic force of the torsion spring 35 and flip over, thereby protecting the arc-shaped shovel body 3 from damage.

[0026] When the device encounters a large obstacle that could damage the main structure while traveling at high speed, such as Figure 1 , Figure 5 and Figure 7As shown, the core obstacle avoidance mechanism is activated. Specifically, an asymmetric buffer bushing 5 is set between the swing shaft 2 and the cross sleeve 13. The asymmetric buffer bushing 5 has non-uniformly distributed thick-walled buffer parts 6 and thin-walled parts 7 along the circumferential direction. The thickness direction of the thick-walled buffer part 6 corresponds to the direction of the horizontal positive impact force received by the arc-shaped shovel body 3. The significance of this design is that when the arc-shaped shovel body 3 collides with a hard obstacle, the thick-walled buffer part 6 allows the swing shaft 2 to generate a small radial displacement instantaneously through its own radial elastic deformation, thus converting the rigid impact into a buffer displacement.

[0027] To capture this tiny buffer displacement and translate it into control logic, such as Figure 5 , Figure 6 and Figure 8 As shown, a stroke amplification mechanism is connected to the swing shaft 2 via a transmission method. The stroke amplification mechanism includes a collar 24 and a lever 25. The collar 24 is coaxially sleeved on the swing shaft 2 and moves radially synchronously with it. The lever 25 is rotatably mounted on the mounting bracket 14 fixed on the cross sleeve 13 via a fulcrum shaft 26. The fulcrum shaft 26 is set close to the swing shaft 2, so that the lever 25 forms a short lever arm and a long lever arm. The short lever arm is connected to the collar 24 via a strip groove 27 and a toggle pin 28, while the long lever arm touches the output end of the control valve 42 downward. Its function is to use the lever 25 principle to amplify the small radial displacement of the swing shaft 2 into a larger stroke output at the end of the long lever arm, thereby accurately triggering the subsequent pressure relief action.

[0028] When considering the hydraulic stability of the system in depth, such as Figure 8 and Figure 11 As shown, this invention introduces an emergency pressure relief feedback loop constructed by a control valve 42 and an accumulator 8. Specifically, the accumulator 8 is mounted on the connecting base 1 to provide a variable volume space, while the control valve 42 is fixed by a mounting bracket 14. Its interior has a pressure relief flow channel connecting the accumulator 8 and the lifting cylinder 4 to control the switching of the oil flow direction. It should be noted that the accumulator 8 used in this invention is a commonly used energy storage element in hydraulic systems, which stores or releases energy by utilizing the pressure balance between compressed gas (such as nitrogen) and hydraulic oil.

[0029] Under normal snow removal operation conditions, such as Figure 9 As shown, the valve core 10 is in the reset state under the action of the return spring 21, keeping the pressure relief passage normally closed, thereby ensuring that the lifting cylinder 4 can stably support the arc-shaped shovel 3 for operation. However, once the arc-shaped shovel 3 experiences a violent collision, such as... Figure 8 and Figure 10 As shown, the long lever arm of the stroke amplification mechanism is passively triggered by the radial displacement generated by the swing shaft 2, which in turn actuates the valve core 10, causing the pressure relief flow channel to instantly switch to the open state, as shown. Figure 13As shown, the passage between the lifting cylinder 4 and the accumulator 8 is opened.

[0030] Due to the incompressibility of hydraulic fluid in a hydraulic system, when subjected to a large, instantaneous external impact force, if the oil circuit is in a completely closed and rigid state, the internal pressure of the system will experience an explosive increase, which can easily destroy seals or weak points in the structure. For example... Figure 1 and Figure 13 As shown, by opening the pressure relief channel, the oil in the lifting cylinder 4 can be quickly discharged to the accumulator 8. The accumulator 8 absorbs the incoming oil using its energy storage and buffering characteristics, thus enabling the lifting cylinder 4 to retract when the arc-shaped shovel body 3 is subjected to a large impact. This mechanism effectively unloads the impact kinetic energy, preventing oil leakage, rupture, or metal structure damage to the lifting cylinder 4 and subsequent oil circuits due to instantaneous high-pressure impact, thereby ensuring the structural integrity of the entire device in complex high-speed snow removal environments.

[0031] like Figures 8 to 11 As shown, the specific structure of the control valve 42 is as follows: The control valve 42 includes a valve body 9 and a valve core 10. The valve body 9 has a columnar groove 15 extending along its axial direction. The valve core 10 includes a first piston head 16, a second piston head 17, and a piston rod 18 connecting the two. The first piston head 16 and the second piston head 17 slide in the columnar groove 15 and form an annular flow groove 41 between them. The end of the piston rod 18 is equipped with a roller 29 for abutting against the long lever arm of the lever 25. Under the elastic force of the return spring 21, the valve core 10 causes the piston rod 18 to extend outward to its maximum stroke. At this time, the second piston head 17 simultaneously blocks the first oil port 19 and the second oil port 20 on the valve wall from the inside, cutting off the connection between the lifting cylinder 4 and the accumulator 8. When the piston rod 18 is pressed down and retracted by the lever 25, the first oil port 19 and the second oil port 20 are connected through the annular flow groove 41, and the pressure relief flow channel is immediately in the open state.

[0032] To prevent the device from vibrating violently due to the instantaneous disappearance of impact force during obstacle avoidance, such as Figure 10 and Figure 14 As shown, a through guide hole 23 is provided in the second piston head 17, and a pressure holding chamber 22 is formed on the side opposite to the first piston head 16. When the pressure relief channel is opened, some high-pressure oil enters the pressure holding chamber 22 through the guide hole 23. Its function is to delay the reset speed of the valve core 10 by using the pressure in the pressure holding chamber 22 after the impact disappears, so that the oil in the lifting cylinder 4 can flow back smoothly, avoiding hydraulic shock caused by the valve closing too fast.

[0033] In actual hydraulic circuit operation, the device is powered by an oil pump (not shown in the figure) and the oil circuit switching is controlled via a four-position three-way directional valve (not shown in the figure), such as... Figure 11As shown, the lifting cylinder 4 is connected to a first pipe 36 and a second pipe 37. A one-way valve 38, supplying only oil to the lifting cylinder 4, is installed on the first pipe 36. When the snow removal device needs to be raised, high-pressure oil passes through the first pipe 36, opening the one-way valve 38 and entering the lifting cylinder 4; when the snow removal device needs to be lowered, as shown... Figure 12 As shown, the oil enters the lifting cylinder 4 through the second pipeline 37. At this time, due to the one-way blocking effect of the check valve 38, the first pipeline 36 cannot return oil. Therefore, the pressure is guided to the hydraulic control end of the check valve 38 through the high-pressure pipeline 40 connected to the second pipeline 37 and forced open, thereby realizing the normal descent of the lifting cylinder 4.

[0034] In special conditions of collision avoidance, such as Figure 13 As shown, since the one-way valve 38 is closed at this time, the return oil from the lifting cylinder 4 after being pressurized cannot flow to the reversing valve through the first pipeline 36, but can only flow to the first oil port 19 through the branch oil line 39. Once the stroke amplification mechanism presses down the control valve 42, the oil is quickly discharged into the accumulator 8 through the first oil port 19, the annular flow groove 41, and the second oil port 20, realizing the passive retraction and obstacle avoidance of the lifting cylinder 4. When the obstacle is passed and the impact force disappears, as... Figure 9 and 14 As shown, the pressure oil temporarily stored in the accumulator 8 will flow back to the lifting cylinder 4 through the control valve 42, driving the arc-shaped shovel 3 to return to the working position. Until the oil pressure in the pressure relief channel drops during the reset process, the reset spring 21 finally overcomes the residual pressure of the pressure holding chamber 22 to drive the valve core 10 to reset, re-seal the first oil port 19 and the second oil port 20, so that the lifting cylinder 4 returns to the normal operating controlled state.

[0035] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A high-speed obstacle-avoiding front-mounted snow removal device, comprising a connecting base (1), a swing shaft (2) connected to the connecting base (1) via a connecting frame, an arc-shaped shovel (3) supported by the swing shaft (2), and a lifting cylinder (4) for driving the connecting frame to rise and fall, characterized in that, Also includes: An asymmetric buffer bushing (5) is provided in the connection between the swing shaft (2) and the connecting frame. The asymmetric buffer bushing (5) is provided with a non-uniformly distributed thick-walled buffer part (6) and thin-walled part (7) along the circumferential direction. The thick-walled buffer part (6) corresponds to the direction of the horizontal impact force received by the arc-shaped shovel (3). It is used to make the swing shaft (2) generate radial displacement by the radial deformation of the thick-walled buffer part (6) when the arc-shaped shovel (3) is subjected to the collision force. The stroke amplification mechanism is connected to the swing shaft (2) for sensing the slight radial displacement of the swing shaft (2) relative to the arc-shaped shovel (3) and amplifying and outputting the displacement. An accumulator (8) is connected to the connecting base (1) and is used to absorb and temporarily store the oil discharged by the lifting cylinder (4) during obstacle avoidance. The control valve (42) includes a valve body (9) and a valve core (10). The valve body (9) has a pressure relief channel that connects the accumulator (8) and the lifting cylinder (4). The pressure relief channel is normally closed. The valve core (10) is activated by the output end of the stroke amplification mechanism to open the pressure relief channel when the swing shaft (2) generates radial displacement.

2. The high-speed obstacle-avoiding front-mounted snow removal device according to claim 1, characterized in that, The connecting frame includes an upper triangular frame (11) and a lower triangular frame (12) hinged to the connecting base (1). One end of the upper triangular frame (11) and the lower triangular frame (12) is hinged to a cross sleeve (13). The swing shaft (2) is located between the upper triangular frame (11) and the lower triangular frame (12), and both ends of the swing shaft (2) are rotatably connected to the two cross sleeves (13). The asymmetric buffer bushing (5) is located between the swing shaft (2) and the cross sleeve (13).

3. A high-speed obstacle-avoiding front-mounted snow removal device according to claim 2, characterized in that, The valve body (9) is fixedly connected to one of the cross sleeves (13) by a mounting bracket (14). The valve body (9) has a columnar groove (15) extending along its own axis, and both ends of the valve body (9) are closed structures. The valve core (10) includes a first piston head (16), a second piston head (17), and a piston rod (18) connecting the two. The first piston head (16) and the second piston head (17) slide in the columnar groove (15) in a sealed manner, and an annular flow groove (41) is formed between them. One end of the piston rod (18) extends outward from the second piston head (17) through the valve body (9) to form a trigger end that cooperates with the stroke amplification mechanism. The outer wall of the valve body (9) has a first oil port (19) and a second oil port (20) arranged symmetrically. The annular flow groove (41), the first oil port (19), and the second oil port (20) together constitute the pressure relief flow channel.

4. A high-speed obstacle-avoiding front-mounted snow removal device according to claim 3, characterized in that, The control valve (42) also includes a return spring (21), which is located in the columnar groove (15) and abuts against the first piston head (16) to drive the piston rod (18) to extend outward. When the second piston head (17) abuts against the inner wall of the valve body (9), the piston rod (18) reaches its maximum extension stroke, and the circumferential side of the second piston head (17) simultaneously blocks the first oil port (19) and the second oil port (20).

5. A high-speed obstacle-avoiding front-mounted snow removal device according to claim 4, characterized in that, The second piston head (17) is separated from the first piston head (16) and forms a pressure-holding cavity (22) between the closed end of the valve body (9). A guide hole (23) is provided in the second piston head (17) to pass through its two end faces. The annular flow groove (41) is connected to the pressure-holding cavity (22) through the guide hole (23).

6. A high-speed obstacle-avoiding front-mounted snow removal device according to claim 3, characterized in that, The stroke amplification mechanism includes a collar (24) and a lever (25). The collar (24) is coaxially sleeved on the swing shaft (2). The lever (25) is located above the valve body (9) and is rotatably connected to the mounting bracket (14) through a fulcrum shaft (26). The fulcrum shaft (26) is close to the swing shaft (2) so that the two ends of the lever (25) respectively form a short lever arm extending towards the swing shaft (2) and a long lever arm extending towards the valve body (9). A strip groove (27) is provided in the short lever arm along its length direction. An actuating pin (28) is formed on the outer wall of the collar (24) and passes through the strip groove (27). A roller (29) is connected to the extended end of the piston rod (18). The long lever arm abuts against the roller (29) downwards.

7. A high-speed obstacle-avoiding front-mounted snow removal device according to claim 1, characterized in that, A floating module (30) is connected to the swing shaft (2), and a support beam (31) is installed on the floating module (30). The arc-shaped shovel (3) is hinged to the support beam (31), and there are several connecting strips (32) between them to limit the forward tilt angle of the arc-shaped shovel (3).

8. A high-speed obstacle-avoiding front-mounted snow removal device according to claim 7, characterized in that, Two swing cylinders (33) are installed on the connecting base (1) in a symmetrical state about the swing shaft (2), and the output end of the swing cylinder (33) is hinged to the support beam (31).

9. A high-speed obstacle-avoiding front-mounted snow removal device according to claim 1, characterized in that, The bottom of the arc-shaped shovel body (3) is provided with a number of movable shovel blades (34) arranged in parallel along its length direction. The upper end of the movable shovel blades (34) is hinged to the arc-shaped shovel body (3), and a torsion spring (35) is provided at the hinge point to keep the movable shovel blades (34) in an inclined state.

10. A high-speed obstacle-avoiding front-mounted snow removal device according to claim 3, characterized in that, The lifting cylinder (4) is connected to a first pipeline (36) and a second pipeline (37). The first pipeline (36) is provided with a one-way valve (38) that supplies oil only to the lifting cylinder (4). The section of the first pipeline (36) between the one-way valve (38) and the lifting cylinder (4) is connected to the first port (19) of the control valve (42) via a branch oil line (39). The second port (20) of the control valve (42) is connected to the accumulator (8). The second pipeline (37) is connected to a high-pressure pipeline (40) that leads to the one-way valve (38) and is opened by oil pressure.

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