High-speed erosion sand dust flow accurate regulation and control structure

Abstract

The invention discloses a high-speed erosion sand dust flow accurate regulation and control structure which is characterized in that metal elastic pieces are arranged at the far end of a channel pipe, the root of each metal elastic piece is fixedly connected with the tail end of an expanding section, and the end, right facing the root of the corresponding metal elastic piece, of each metal elastic piece is a movable end; all the metal elastic sheets are jointly used as sealing elements at the tail ends of the gaps; when the metal elastic pieces are subjected to pressure in the radial direction, all the metal elastic pieces on the same diameter expanding section are contained in the radial direction so that the tail ends of the gaps can be opened. By the adoption of the scheme, the regulation and control precision and range of the high-speed erosion sand dust flow are remarkably improved, and the erosion sand dust flow can be regulated and controlled at high frequency.

Description

Technical Field

[0001] The present invention belongs to the technical field of high-speed erosion sand and dust equipment, and specifically relates to a precise regulation structure for high-speed erosion sand and dust flow rate. Background Art

[0002] In order to continuously simulate a strong sand and dust environment, the developed sand and dust environment simulation test device includes a sand supply system (see literature CN118858125A for details), the sand supply system is connected to a wind tunnel, and a rotating core body is arranged in the wind tunnel. The wind tunnel is installed in a frame and includes a confluent cylinder, a first cylinder, a flexible connection cylinder, a second cylinder, a special-shaped cylinder, and a diffusion cylinder arranged in sequence; the sand outlet channel of the sand supply system communicates with the inner cavity of the diffusion cylinder; a core body composed of a plurality of channel pipes arranged in an array is arranged in the diffusion cylinder. Each channel pipe includes a reduced-diameter section, a throat section, and an enlarged-diameter section connected in sequence. The cross-sections of the reduced-diameter section and the enlarged-diameter section are rectangular. There is a gap between the tube walls at the distal ends of any two adjacent channel pipes, and there is no gap between the tube walls at the proximal ends of any two adjacent channel pipes; a sand pushing mechanism is arranged on the core body. The sand pushing mechanism includes a push plate that simultaneously sleevs on all channel pipes. The push plate is connected to a reciprocating cam motion mechanism. During the working process of the reciprocating cam motion mechanism, the sand grains between adjacent channel pipes are axially extruded when the push plate moves forward along the channel pipes to send the sand grains to the front of the distal end of the channel pipes.

[0003] Although the aforementioned sand and dust environment simulation test device preferably ensures the fluid uniformity of strong wind and sand acting on the target area, the sand and dust flow rate during the high-speed erosion process is difficult to precisely regulate. The single-time erosion sand and dust flow rate can only be controlled within a large range of about 1.5 kg / min (for a target area with a diameter of 6 m), and the cam of the reciprocating cam motion mechanism must be replaced to adjust the sand and dust flow rate, which is not convenient for quick adjustment and operation. Summary of the Invention

[0004] To at least solve the technical problems mentioned in the background art, the purpose of the present invention is to provide a precise regulation structure for high-speed erosion sand and dust flow rate.

[0005] The present invention adopts the following technical solutions.

[0006] A precise control structure for the flow rate of high-speed eroding sand and dust, including a sand pushing mechanism arranged on a core body. The sand pushing mechanism includes a push plate sleeved on all channel pipes at the same time. The push plate is connected to a reciprocating driving mechanism. During the operation of the reciprocating driving mechanism, when the push plate moves forward along the channel pipe, the sand grains between adjacent channel pipes are axially extruded to send the sand grains to the front of the distal end of the channel pipe. A metal elastic sheet is arranged at the distal end of the channel pipe. The root of each metal elastic sheet is fixedly connected to the end of the enlarged diameter section. One end of each metal elastic sheet facing the root of the metal elastic sheet is a movable end. When the metal elastic sheet is in a free state, all the metal elastic sheets together serve as a closing element at the end of the gap. When the metal elastic sheet is subjected to a radial pressure, all the metal elastic sheets on the same enlarged diameter section are radially retracted to open the end of the gap. In the present invention, the enlarged diameter section refers to a variable diameter structure of the inner diameter of the corresponding pipe section.

[0007] In the present invention, the precise control structure for the flow rate of high-speed eroding sand and dust further includes a sand supply system. The sand supply system is connected to a wind tunnel, and a rotating core body is arranged in the wind tunnel. The wind tunnel is installed in a frame. The wind tunnel includes a flow collecting cylinder, a first cylinder, a flexible connection cylinder, a second cylinder, a special-shaped cylinder, and a diffusion cylinder arranged in sequence. The sand outlet channel of the sand supply system communicates with the inner cavity of the diffusion cylinder. A core body composed of a plurality of channel pipes arranged in an array is arranged in the diffusion cylinder. Each channel pipe includes a reduced diameter section, a throat section, and an enlarged diameter section connected in sequence. The cross sections of the reduced diameter section and the enlarged diameter section are rectangular. There is a gap between the tube walls at the distal ends of any two adjacent channel pipes, and there is no gap between the tube walls at the proximal ends of any two adjacent channel pipes.

[0008] As a preferred solution, when the metal elastic sheet is in a free state, the angle between the metal elastic sheet and the axis of the enlarged diameter section is 40 - 60°.

[0009] As a preferred solution, the outer walls of all the enlarged diameter sections form an angle of 45° with the horizontal plane.

[0010] In order to be able to control the flow rate of eroding sand and dust more precisely and at a high frequency, the reciprocating driving mechanism adopts a lead screw transmission mechanism, and the movable seat of the lead screw transmission mechanism is connected to the push plate.

[0011] In the present invention, a strip-shaped hole is arranged on the top wall of the diffusion cylinder, and a sand supply pipe is installed along the strip-shaped hole. The top wall of the diffusion cylinder is a plane, and the top surface of the channel pipe is also a plane. The rotating core body includes a rectifying cover, an impeller, a blade assembly, a cone cylinder assembly, and a tail cover arranged in sequence. Two groups of blades are arranged on the cone cylinder assembly, and the impeller is connected to a motor.

[0012] In order to be able to control the flow rate of eroding sand and dust more smoothly, the outer wall contour of the enlarged diameter section in the area directly below the strip-shaped hole is circular.

[0013] As a preferred solution, the wall thickness of the metal elastic sheet does not exceed 2 mm, and the height and width of the gap are both not greater than 12 mm.

[0014] Beneficial effects: By adopting the solution of the present invention, for a target area with a diameter of 6 m, at least the erosion sand and dust flow rate in the target area can be controlled within the range of 3 - 5.2 kg / min, and the regulation accuracy of the single - time erosion sand and dust flow rate can be controlled within 0.3 - 0.6 kg / min, significantly improving the regulation accuracy and range of the high - speed erosion sand and dust flow rate compared with the existing solutions; by adopting the solution of the present invention, the erosion sand and dust flow rate can also be regulated at a high frequency, and the regulation switching time of the single - time erosion sand and dust flow rate can reach within seconds (while the existing solution takes several minutes, mainly because it is time - consuming and laborious to replace the cam of the reciprocating drive mechanism), and the erosion sand and dust flow rate can be smoothly regulated without using vibration equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic cross - sectional view of the equipment to which the high - speed erosion sand and dust flow rate precise regulation structure in Embodiment 1 belongs; Figure 2 Schematic three - dimensional view of the air duct of the equipment to which the high - speed erosion sand and dust flow rate precise regulation structure in Embodiment 1 belongs; Figure 3 Schematic view of the initial state of the high - speed erosion sand and dust flow rate precise regulation structure in Embodiment 1 (the metal elastic piece is in a free state); Figure 4 For Figure 3 end face schematic view; Figure 5 For Figure 3 partial schematic view of the expanded diameter section in the Figure 6 Schematic view of the working state of the high - speed erosion sand and dust flow rate precise regulation structure in Embodiment 1 (the state where the end of the gap is open after the radial accommodation of the metal elastic piece); Figure 7 For Figure 6 end face schematic view; Figure 8 For Figure 6 partial schematic view of the expanded diameter section in the Figure 9 For the corresponding Figure 6 partial schematic view of the expanded diameter section in the DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention. It should be noted that for the main structure of the equipment to which the high-speed erosion sand and dust flow precision control structure in this embodiment belongs, refer to Embodiment 1 of the existing document CN118858125A. The main difference in structure from this document is that the reciprocating drive mechanism connected to the push plate 30 is improved, and metal elastic pieces 24 with a specific structure are added at the end of each channel tube 16 (that is, the enlarged diameter section 22). Embodiment 1

[0017] Combined with Figures 1 to 8 As shown, a high-speed erosion sand and dust flow precision control structure is used in an outdoor simulation test device in a strong wind and sand environment. The structure includes a sand pushing mechanism arranged on the core body. The sand pushing mechanism includes a push plate 30 sleeved on all the channel tubes 16 at the same time. The push plate 30 is connected to a reciprocating drive mechanism. During the operation of the reciprocating drive mechanism, when the push plate 30 moves forward along the channel tube 16, the sand grains between the adjacent channel tubes 16 are axially extruded to send the sand grains to the front of the distal end of the channel tube 16. A metal elastic piece 24 is arranged at the distal end of the channel tube 16. The root of each metal elastic piece 24 is fixedly connected to the end of the enlarged diameter section 22. One end of each metal elastic piece 24 facing the root of the metal elastic piece 24 (that is Figure 3 the right end of the metal elastic piece 24 in) is a movable end. When the metal elastic piece 24 is in a free state, all the metal elastic pieces 24 together serve as a closing element at the end of the gap 23. When the metal elastic piece 24 is subjected to a radial pressure, all the metal elastic pieces 24 on the same enlarged diameter section 22 are radially received to open the end of the gap 23. When the metal elastic piece 24 is in a free state, the included angle between the metal elastic piece 24 and the axis of the enlarged diameter section 22 is 45°. Among them, the wall thickness of the metal elastic piece 24 is 1.5 mm, and the height and width of the gap 23 are both 8 mm.

[0018] It also includes a sand supply system. The sand supply system is connected to the air duct 1 and a rotating core body 2 is arranged inside the air duct 1. The air duct 1 is installed in the frame 3, and the frame 3 is installed on the vibration device (during the vibration process, the swing amount of the frame 3 does not exceed 5 mm). The air duct 1 includes a converging cylinder 10, a first cylinder 11, a flexible connection cylinder 12, a second cylinder 13, a special-shaped cylinder 14, and a diffuser cylinder 15 arranged in sequence. The sand outlet channel of the sand supply system communicates with the inner cavity of the diffuser cylinder 15. Inside the diffuser cylinder 15, there is a core body composed of a number of channel pipes 16 arranged in an array. Each channel pipe 16 includes a reduced-diameter section 20, a throat section 21, and an enlarged-diameter section 22 connected in sequence. The cross-sections of the reduced-diameter section 20 and the enlarged-diameter section 22 are rectangular. There is a gap 23 between the tube walls at the distal ends of any two adjacent channel pipes 16, and there is no gap between the tube walls at the proximal ends of any two adjacent channel pipes 16.

[0019] In this embodiment, the reciprocating drive mechanism adopts a lead screw drive mechanism, and the movable seat of the lead screw drive mechanism is connected to the push plate 30. A strip-shaped hole 17 is provided on the top wall of the diffuser cylinder 15, and a sand supply pipe is installed along the strip-shaped hole 17. The diffuser cylinder 15 is horizontally arranged, the top wall of the diffuser cylinder 15 is a plane, and the top surface of the channel pipe 16 is also a plane. The rotating core body 2 includes a fairing, an impeller, a blade assembly, a cone cylinder assembly, and a tail cover arranged in sequence. Two groups of blades are provided on the cone cylinder assembly, and the impeller is connected to the motor.

[0020] During use: The air flow enters the air duct 1 under the action of the rotating core body 2 (the air flow direction is as shown by the hollow arrow in Figure 1 ), and flows through the inner cavity of the channel pipe 16 and is accelerated. The flow path of the sand grains is as shown by the solid arrow in Figure 1 . The dry sand grains are continuously introduced into the strip-shaped hole 17 through the sand supply system. The sand grains will fall along the strip-shaped hole 17 into the gap 23 between the adjacent channel pipes 16. When the gap 23 is filled with sand grains and the reciprocating cam motion mechanism works, the sand grains will be laterally pushed by the push plate 30 to the front of the distal end of the channel pipe 16 and mixed with the air flow, and an erosion fluid will be formed and ejected. Whenever the push plate 30 is pushed forward once and reset, the sand grains above the strip-shaped hole 17 will replenish into the gap 23 to ensure that there are always sand grains in the gap 23, so as to realize continuous feeding of sand grains.

[0021] During use: In the state without sand and dust erosion (i.e., the initial state), as shown in Figures 3 to 5As shown, all the metal shrapnel 24 are in a free state, and all the metal shrapnel 24 together serve as a closing element at the end of the gap 23. At this time, the sand injected / added into the gap 23 through the sand supply pipe and the strip hole 17 hardly drops / spills from the end of the gap 23; when the reciprocating drive mechanism operates according to the set parameters, that is, in the state of sand and dust erosion (i.e., the working state), the push plate 30 will repeatedly push forward and backward. With the continuous injection / addition of sand, and every time the push plate 30 pushes forward, it will radially squeeze the metal shrapnel 24 by means of the sand in the gap 23, so that the metal shrapnel 24 is subjected to radial pressure, thereby realizing the radial accommodation (or folding) of all the metal shrapnel 24 on the same diameter-expanding section 22 to open the end of the gap 23. The state at this time is as shown in Figures 6 to 8 shown, so that the sand in the gap 23 enters the erosion air flow through the end of the gap 23.

[0022] Due to the use of the metal shrapnel 24 with a specific structure in cooperation with the lead screw drive mechanism, the sand in the gap 23 can only be pushed into the erosion air flow when the push plate 30 pushes forward. The amount of sand pushed into the erosion air flow per unit time depends on the precise stroke and frequency of the forward push of the push plate 30, so that the sand and dust erosion flow rate can be accurately controlled. In the existing scheme, because there is no restriction of the metal shrapnel 24, some sand will enter the erosion air flow by itself during the process of adding sand. Coupled with the inertial forward movement and shaking during the forward push of the cam, it is impossible to accurately and smoothly control the sand and dust erosion flow rate.

[0023] Under the same erosion air flow parameters, the control performance tests were carried out for the solution in Embodiment 1 of the present invention and the existing solution (Embodiment 1 of Document CN118858125A). Target bags (collecting bags with a diameter of 6 m, i.e., the target target area) were respectively set at a distance of 6 m from the distal air outlet of the diffusion cylinder 15. The amount of sand collected by the collecting bag per unit time was detected. The results showed that: by adopting the solution in Embodiment 1, the erosion sand and dust flow rate in the target target area could be controlled at 3.05 kg / min (the forward push amount / forward movement amount of the push plate 30 from its initial position was 5 mm), 3.32 kg / min (the forward push amount of the push plate 30 from its initial position was 8 mm), 3.6 kg / min (the forward push amount of the push plate 30 from its initial position was 10 mm), 4.12 kg / min (the forward push amount of the push plate 30 from its initial position was 12 mm), 5.18 kg / min (the forward push amount of the push plate 30 from its initial position was 20 mm)...... The regulation accuracy of the single-time erosion sand and dust flow rate could be controlled within about 0.3 - 0.6 kg / min. When adopting the existing solution, the erosion sand and dust flow rates in the target target area were 4.86 kg / min (the cam length was 20 cm, and the forward push amount of the push plate 30 from its initial position corresponded to 10 mm, which was the minimum forward push amount that the cam could achieve in the existing solution), 6.22 kg / min (the cam length was 20.5 cm, and the forward push amount of the push plate 30 from its initial position corresponded to 25 mm), and the single-time erosion sand and dust flow rate was as high as 1.36 kg / min; when the cam length was further increased to 21 cm, the amount of sand collected in the target target area was only 1.42 kg / min, indicating that too many sand grains were pushed in and the erosion process was unqualified / ineffective. Embodiment 2

[0024] A precise regulation structure for high-speed erosion sand and dust flow rate, referring to Embodiment 1, the difference from Embodiment 1 is that: the outer wall contour of the diameter-expanded section 22 in the area directly below the strip-shaped hole 17 is circular. The advantages of this embodiment and Embodiment 3 also include that the vibration equipment can be omitted, which is beneficial to automatically and smoothly fill the gap 23 with sand grains. Embodiment 3

[0025] A precise regulation structure for high-speed erosion sand and dust flow rate, referring to Embodiment 1, the difference from Embodiment 1 is that: as shown in Figure 9 Combined, the diffusion cylinder 15 is arranged in the frame at an angle of 45°, so that the angle between the outer wall of the diameter-expanded section 22 and the horizontal plane is 45°.

Claims

1. A precise regulation structure for high-speed erosion sand dust flow rate, comprising a sand pushing mechanism arranged on a core body. The sand pushing mechanism includes a push plate (30) sleeved on all channel pipes (16) at the same time. The push plate (30) is connected to a reciprocating driving mechanism. During the working process of the reciprocating driving mechanism, when the push plate (30) moves forward along the channel pipe (16), the sand grains between adjacent channel pipes (16) are axially extruded to send the sand grains to the front of the distal end of the channel pipe (16); It is characterized in that: A metal shrapnel (24) is provided at the distal end of the channel tube (16). The root of each metal shrapnel (24) is fixedly connected to the end of the diameter-expanded section (22). One end of each metal shrapnel (24) facing the root of the metal shrapnel (24) is a movable end. When the metal shrapnel (24) is in a free state, all the metal shrapnels (24) together serve as a closing element at the end of the gap (23). When the metal shrapnel (24) is subjected to a radial pressure, all the metal shrapnels (24) on the same diameter-expanded section (22) are radially retracted to open the end of the gap (23).

2. The regulatory structure according to claim 1, characterized in that: It further includes a sand supply system. The sand supply system is connected to the air duct (1), and a rotating core body (2) is arranged in the air duct (1). The air duct (1) is installed in the frame (3). The air duct (1) includes a converging cylinder (10), a first cylinder (11), a flexible connection cylinder (12), a second cylinder (13), a special-shaped cylinder (14), and a diffusion cylinder (15) arranged in sequence. The sand outlet channel of the sand supply system communicates with the inner cavity of the diffusion cylinder (15). A core body composed of a number of channel tubes (16) arranged in an array is arranged in the diffusion cylinder (15). Each channel tube (16) includes a reduced-diameter section (20), a throat section (21), and a diameter-expanded section (22) connected in sequence. The cross-sections of the reduced-diameter section (20) and the diameter-expanded section (22) are rectangular. There is a gap (23) between the tube walls at the distal ends of any two adjacent channel tubes (16), and there is no gap between the tube walls at the proximal ends of any two adjacent channel tubes (16).

3. The regulatory structure according to claim 1, wherein: When the metal shrapnel (24) is in a free state, the angle between the metal shrapnel (24) and the axis of the diameter-expanded section (22) is 40° - 60°.

4. The regulatory structure according to claim 1, characterized in that: The outer walls of all the diameter-expanded sections (22) form an angle of 45° with the horizontal plane.

5. The regulatory structure according to claim 1, characterized in that: The reciprocating drive mechanism adopts a lead screw drive mechanism, and the movable seat of the lead screw drive mechanism is connected to the push plate (30).

6. The regulatory structure according to claim 1, characterized in that: A strip-shaped hole (17) is provided on the top wall of the diffusion cylinder (15), and a sand supply pipe is installed along the strip-shaped hole (17). The top wall of the diffusion cylinder is a plane, and the top surface of the channel tube is also a plane. The rotating core body includes a fairing, an impeller, a blade assembly, a cone cylinder assembly, and a tail cover arranged in sequence. Two groups of blades are provided on the cone cylinder assembly, and the impeller is connected to the motor.

7. The regulatory structure according to claim 6, wherein: The outer wall contour of the diameter-expanded section (22) in the area directly below the strip-shaped hole (17) is circular.

8. The regulation structure according to any one of claims 1-7, characterized in that: The wall thickness of the metal shrapnel (24) does not exceed 2 mm, and the height and width of the gap (23) are both not greater than 12 mm.

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