A rapid forging hydraulic press

Abstract

The present invention belongs to the technical field of forging hydraulic presses, specifically a rapid forging hydraulic press, comprising a shell, a hydraulic device, a hydraulic rod, a force seat and a cleaning device, the outer surface of the shell is fixedly connected with a hydraulic device, the hydraulic device is equipped with a hydraulic rod, a force seat is provided directly below the hydraulic rod, the lower surface of the force seat is fixedly connected with a spring, the other end of the spring is fixedly connected to the lower surface of the shell, and a cavity is formed between the force seat and the shell, an air outlet and an air inlet are provided inside the shell, and one end of the air outlet and the air inlet are connected to the cavity, a one-way valve is provided in the air outlet and the air inlet, one side of the shell is rotatably connected with a cleaning device, the rear side of the shell is fixedly connected with a collection cover, and a collection box is provided below the collection cover. The present invention can better remove the oxide scale generated during metal forging through the cleaning device, thereby improving the forging efficiency of the staff and the quality of the forgings.

Description

Technical Field

[0001] The invention belongs to the technical field of forging hydraulic presses, in particular to a rapid forging hydraulic press. Background Art

[0002] Rapid forging has the advantages of fast forming rhythm, high workpiece quality, high impact resistance and fatigue strength, short downtime, no material temperature restrictions and high material homogeneity. Based on the above advantages, rapid forging processes, equipment and technologies have attracted the attention of more and more experts and scholars, and rapid forging has become one of the key development directions of forging equipment.

[0003] With the continuous advancement of science and technology and the further improvement of user requirements, people have put forward higher requirements for the dimensional accuracy, metal recovery rate and productivity of forgings. When metal is forged on a hydraulic press, the surface of the metal will fall off oxide scale. Since the oxide scale often affects the quality of the forging, when the oxide scale falls off too much, it needs to be removed. Nowadays, most of the workers remove the oxide scale manually, which is very inconvenient and affects the forging efficiency of the workers.

[0004] In view of this, in order to solve the above-mentioned technical problems, the present invention designs a rapid forging hydraulic press. Summary of the invention

[0005] The invention aims to solve the problem of how to better remove the oxide scale generated when metal is forged on a rapid forging hydraulic press so as to improve the forging efficiency of the workers and the quality of the forgings.

[0006] To achieve the above-mentioned purpose, the present invention provides a rapid forging hydraulic press, comprising a shell, a hydraulic device, a hydraulic rod, a force-bearing seat and a cleaning device, wherein the outer surface of the shell is fixedly connected to the hydraulic device, the hydraulic device is equipped with a hydraulic rod, the upper surface of the shell is provided with a through hole, the hydraulic rod is located in the through hole, a force-bearing seat is provided directly below the hydraulic rod, the lower surface of the force-bearing seat is fixedly connected to a spring, the other end of the spring is fixedly connected to the lower surface of the shell, a cavity is formed between the force-bearing seat and the shell, an air outlet and an air inlet are provided inside the shell, and One end of the air outlet and the air inlet are connected with the cavity, and a one-way valve is provided in the air outlet and the air inlet. A cleaning device is rotatably connected to one side of the shell, and the cleaning device includes a mounting bracket, a high-temperature resistant hose and an air nozzle. The mounting bracket is rotatably connected to one side of the inner surface of the shell, and a high-temperature resistant hose is provided in the mounting bracket, one end of the high-temperature resistant hose is connected with the other end of the air outlet, the mounting bracket is fixedly connected to the air nozzle, and the air nozzle is connected with the other end of the high-temperature resistant hose. A collection hood is fixedly connected to the rear side of the shell, and a collection box is provided below the collection hood.

[0007] Preferably, a motor is fixedly connected to the outer surface of the shell on a side close to the cleaning device.

[0008] Preferably, a fixing block is fixedly connected to the lower surface of the inner part of the shell, and the fixing block is located on both sides of the force bearing seat.

[0009] Preferably, a protective cover is provided on the front side of the shell, a rotating shaft is fixedly connected to the top of the protective cover, the protective cover is rotatably connected to the shell through the rotating shaft, a knob is fixedly connected to the outer surface of one end of the rotating shaft, and the knob is located above the motor, an operating window is opened in the middle of the protective cover, and the protective cover is made of high temperature resistant transparent material.

[0010] Preferably, jet holes are provided on both sides of the lower end of the protective cover, and the diameter of the jet holes gradually decreases from close to the inner surface of the shell to the fixed block, and a No. 1 sealing ring is fixedly connected to the side of the jet hole close to the shell, and the No. 1 sealing ring is located inside the protective cover, and a No. 1 jet channel and a No. 2 jet channel are provided in the shell, one end of the No. 1 jet channel is connected to the air outlet channel, and one end of the No. 2 jet channel is connected to the cavity, and the other ends of the No. 1 jet channel and the No. 2 jet channel are fixedly connected to a No. 2 sealing ring, and the No. 2 sealing ring is located in the shell.

[0011] Preferably, a conical cover is fixedly connected to one end of the air inlet duct, a collecting tank is opened in the shell, a filter screen is provided in the collecting tank, the collecting tank is connected to the air inlet duct and is located below the air inlet duct, and a sealing plug is rotatably connected to one side of the collecting tank.

[0012] The beneficial effects of the present invention are as follows:

[0013] 1. When the rapid forging hydraulic press is forging metal, a large amount of oxide scale will fall off the surface of the metal, which is often removed manually by the staff, thus affecting the processing efficiency of the staff. The present invention can better remove the oxide scale through the cleaning device, thereby improving the work efficiency of the staff.

[0014] 2. The cleaning device can quickly remove the oxide scale on the force bearing seat, which often helps to improve the quality of the forgings and reduce the depression of the forging surface that affects the dimensional accuracy of the forgings.

[0015] 3. When the cleaning device removes the oxide scale, the wind shield blocks the oxide scale and collects the oxide scale to prevent the oxide scale from splashing around and scattering on the ground when the cleaning device cleans the oxide scale on the force-bearing seat, causing secondary cleaning of the oxide scale.

[0016] 4. Due to the hydraulic press forging, oxide scale and metal dust are often generated during the forging process. The oxide scale sometimes splashes to the staff and causes harm to the staff. The cleaning device removes the oxide scale to provide the first protection for the staff. The dust generated is sucked into the collection room by starting the motor to provide the second protection for the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings.

[0018] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0019] Figure 2 It is a partial cutaway schematic diagram of the present invention;

[0020] Figure 3 The present invention Figure 2 Sectional view in the AA direction;

[0021] Figure 4 The present invention Figure 2 Enlarged view of point B in the middle;

[0022] Figure 5 The present invention Figure 2 Enlarged view of center C.

[0023] In the figure: shell 1, air outlet 11, air inlet 12, conical cover 121, one-way valve 13, No. 1 jet channel 14, No. 2 jet channel 15, No. 2 sealing ring 16, collecting tank 17, filter screen 171, sealing plug 172, hydraulic device 2, hydraulic rod 3, force seat 4, spring 41, cavity 42, cleaning device 5, mounting frame 51, high temperature resistant hose 52, jet nozzle 53, collecting cover 6, collecting box 7, motor 8, fixing block 9, protective cover 10, rotating shaft 101, knob 102, operating window 103, jet hole 104, No. 1 sealing ring 105. DETAILED DESCRIPTION

[0024] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0025] The present invention provides a rapid forging hydraulic press, comprising a shell 1, a hydraulic device 2, a hydraulic rod 3, a force bearing seat 4 and a cleaning device 5. The outer surface of the shell 1 is fixedly connected with the hydraulic device 2, the hydraulic device 2 is equipped with the hydraulic rod 3, the upper surface of the shell 1 is provided with a through hole, the hydraulic rod 3 is located in the through hole, a force bearing seat 4 is provided directly below the hydraulic rod 3, the lower surface of the force bearing seat 4 is fixedly connected with a spring 41, the other end of the spring 41 is fixedly connected to the lower surface of the shell 1, and a cavity 42 is formed between the force bearing seat 4 and the shell 1, an air outlet 11 and an air inlet 12 are provided inside the shell 1, and the air outlet 11 and the air inlet 12 are provided. One end of the housing 1 is connected to the cavity 42, and a one-way valve 13 is provided in the air outlet 11 and the air inlet 12. A cleaning device 5 is rotatably connected to one side of the shell 1, and the cleaning device 5 includes a mounting bracket 51, a high-temperature resistant hose 52 and an air nozzle 53. The mounting bracket 51 is rotatably connected to one side of the inner surface of the shell 1, and a high-temperature resistant hose 52 is provided in the mounting bracket 51. One end of the high-temperature resistant hose 52 is connected to the other end of the air outlet 11, and the mounting bracket 51 is fixedly connected to the air nozzle 53. The air nozzle 53 is connected to the other end of the high-temperature resistant hose 52. A collecting hood 6 is fixedly connected to the rear side of the shell 1, and a collecting box 7 is provided below the collecting hood 6.

[0026] When the small-scale rapid forging hydraulic press forges metal, the metal is forged by the hydraulic rod 3 in the hydraulic device 2 arranged inside the housing 1. During the forging process, oxide scale will fall off the surface of the metal. Since the oxide scale often affects the quality of the forging, when the metal falls off too much oxide scale during the forging process, the staff needs to manually remove the oxide scale, which is very inconvenient. When the hydraulic rod 3 in the hydraulic device 2 forges the metal on the force seat 4, the force seat 4 is stamped by the hydraulic rod 3. Since a spring 41 is arranged under the force seat 4, the spring 41 contracts to make the force seat 4 move downward, so that the downward moving force seat 4 squeezes the cavity. The air in 42 enters the high temperature resistant hose 52 through the air outlet 11, and then enters the air nozzle 53 from the high temperature resistant hose 52, and is ejected by the air nozzle 53, thereby blowing the oxide scale on the force-bearing seat 4 to the rear side of the shell 1, so as to achieve the first cleaning of the oxide scale. Since the rear side of the shell 1 is fixedly connected with a collecting cover 6, the collecting cover 6 blocks the oxide scale, and the oxide scale falls into the collecting box 7 due to the influence of gravity, thereby achieving the second cleaning of the oxide scale. When the force-bearing seat 4 moves upward due to the spring 41, the air enters the cavity 42 through the air inlet 12. Since both the air inlet 12 and the air outlet 11 are provided with a one-way valve 13, air back suction is prevented.

[0027] As a specific embodiment of the present invention, a motor 8 is fixedly connected to the outer surface of the housing 1 on a side close to the cleaning device 5 .

[0028] When a small-scale rapid forging hydraulic press forges metal, oxide scale will fall off the metal. Since the hydraulic press forges metal rapidly, the oxide scale will sometimes splash around, thus causing harm to the staff. The present invention controls the rotation of the mounting frame 51 in the cleaning device 5 through the motor 8, thereby changing the jet angle of the air nozzle 53, so that the air nozzle 53 can not only clean the oxide scale on the force-bearing seat 4, but also clean the oxide scale splashing around. Thus, while achieving the goal of removing the oxide scale on the force-bearing seat 4, it also protects the staff.

[0029] As a specific implementation of the present invention, a fixing block 9 is fixedly connected to the lower surface of the inner part of the shell 1 , and the fixing block 9 is located on both sides of the force bearing seat 4 .

[0030] When the force seat 4 of the small rapid forging hydraulic press moves due to the stamping of the hydraulic rod 3, the force seat 4 is often prone to shaking, which affects the forging of the metal. Therefore, the present invention provides fixed blocks 9 on both sides of the force seat 4 to prevent the force seat 4 from shaking laterally during movement, thereby affecting the forging of the metal.

[0031] As a specific embodiment of the present invention, a protective cover 10 is provided on the front side of the shell 1, and a rotating shaft 101 is fixedly connected to the top of the protective cover 10. The protective cover 10 is rotatably connected to the shell 1 through the rotating shaft 101. A knob 102 is fixedly connected to the outer surface of one end of the rotating shaft 101, and the knob 102 is located above the motor 8. An operating window 103 is opened in the middle of the protective cover 10, and the protective cover 10 is made of high-temperature resistant transparent material.

[0032] When the staff uses a small rapid forging hydraulic press to forge metal, metal oxide scale often splashes around. In the present invention, the staff rotates the knob 102 clockwise, and the knob 102 drives the rotating shaft 101 to rotate. Since the rotating shaft 101 is fixedly connected to the protective cover 10, the rotating shaft 101 drives the protective cover 10 to flip upward. After the staff puts the metal to be forged on the force-bearing seat 4, they slowly release the knob 102. The protective cover 10 flips downward due to the influence of gravity, thereby covering the front side of the shell 1, so as to achieve the effect of secondary protection for the staff.

[0033] As a specific embodiment of the present invention, jet holes 104 are provided on both sides of the lower end of the protective cover 10, and the diameter of the jet hole 104 gradually decreases from the inner surface of the shell 1 to the fixed block 9. The side of the jet hole 104 close to the shell 1 is fixedly connected to a No. 1 sealing ring 105, and the No. 1 sealing ring 105 is located inside the protective cover 10. A No. 1 jet channel 14 and a No. 2 jet channel 15 are provided in the shell 1. One end of the No. 1 jet channel 14 is connected to the air outlet 11, and one end of the No. 2 jet channel 15 is connected to the cavity 42. The other ends of the No. 1 jet channel 14 and the No. 2 jet channel 15 are fixedly connected to a No. 2 sealing ring 16, and the No. 2 sealing ring 16 is located in the shell 1.

[0034] When the cleaning device 5 of the small rapid forging hydraulic press cleans the oxide scale on the force bearing seat 4, part of the oxide scale will be blown to the lower sides of the inner surface of the shell 1, and the oxide scale near the inner surface of the shell 1 is more, and the oxide scale near the fixed block 9 is less. Due to the influence of the force bearing seat 4 and the cleaning device 5 itself, the cleaning device 5 cannot remove the oxide scale of this part. In the present invention, the force bearing seat 4 is pressed by the hydraulic rod 3, and the force bearing seat 4 moves downward, thereby squeezing the air in the cavity 42 into the first jet channel 14 and the second jet channel 15, and then the first jet channel 14 and the second jet channel 15 transport the air to the protective Air is ejected from the jet hole 104 in the cover 10. Since there are more oxide scales near the shell 1, in order to better remove the oxide scales here, the jet hole 104 has a larger diameter and ejects more air. There are fewer oxide scales near the fixed block 9, and the jet hole 104 has a smaller diameter and ejects less air, so as to achieve reasonable utilization of the air in the No. 1 jet channel 14, so that most of the oxide scales on both sides of the inner surface of the shell 1 are blown to the collecting cover 6. Since the oxide scales are affected by gravity, they fall into the collecting box 7, so as to achieve the effect of removing the oxide scales on both sides of the inner surface of the shell 1.

[0035] As a specific embodiment of the present invention, a conical cover 121 is fixedly connected to one end of the air inlet duct 12, a collecting tank 17 is opened in the shell 1, a filter screen 171 is provided in the collecting tank 17, the collecting tank 17 is connected to the air inlet duct 12 and is located below the air inlet duct 12, and a sealing plug 172 is rotatably connected to one side of the collecting tank 17.

[0036] When a small-scale rapid forging hydraulic press is forging metal, the oxide scale shed from the metal is brittle and can be easily crushed into metal particles suspended in the air. Workers often easily inhale these particles into their bodies while working, which affects their health. The present invention uses a cleaning device to blow away the oxide scale on the force-bearing seat 4 while blowing the metal particles suspended in the air in the shell 1 toward the conical cover 121. The metal particles enter the air inlet duct 12 through the conical cover 121. When the metal particles pass through the collecting tank 17, the filter screen 171 in the collecting tank 17 blocks most of the metal particles to prevent most of the metal particles from entering the cavity 42. When the filtering effect of the filter screen 171 is not good, the staff can open the sealing plug 172 to remove the metal particles in the collecting chamber and replace the filter screen 171, thereby achieving the effect of further protecting the staff.

[0037] Working principle: When a small-scale rapid forging hydraulic press forges metal, the metal is forged by a hydraulic rod 3 in a hydraulic device 2 disposed inside a housing 1. During the forging process, oxide scale will fall off the surface of the metal. Since the oxide scale often affects the quality of the forged piece, when the metal falls off too much oxide scale during the forging process, the staff needs to manually remove the oxide scale, which is very inconvenient. In the present invention, when the hydraulic rod 3 in the hydraulic device 2 forges the metal on the force seat 4, the force seat 4 is stamped by the hydraulic rod 3. Since a spring 41 is disposed under the force seat 4, the spring 41 contracts to cause the force seat 4 to move downward, so that the downward moving force seat 4 squeezes The air in the cavity 42 enters the high-temperature resistant hose 52 through the air outlet 11, and then enters the air nozzle 53 from the high-temperature resistant hose 52, and is ejected by the air nozzle 53, thereby blowing the oxide scale on the force-bearing seat 4 to the rear side of the shell 1, so as to achieve the first cleaning of the oxide scale. Since the rear side of the shell 1 is fixedly connected with a collecting cover 6, the collecting cover 6 blocks the oxide scale, and the oxide scale falls into the collecting box 7 due to the influence of gravity, thereby achieving the second cleaning of the oxide scale. When the force-bearing seat 4 moves upward due to the spring 41, the air enters the cavity 42 through the air inlet 12. Since both the air inlet 12 and the air outlet 11 are provided with a one-way valve 13, air back suction is prevented.

[0038] When a small-scale rapid forging hydraulic press forges metal, oxide scale will fall off the metal. Since the hydraulic press forges metal rapidly, the oxide scale will sometimes splash around, thus causing harm to the staff. The present invention controls the rotation of the mounting frame 51 in the cleaning device 5 through the motor 8, thereby changing the jet angle of the air nozzle 53, so that the air nozzle 53 can not only clean the oxide scale on the force-bearing seat 4, but also clean the oxide scale splashing around. Thus, while achieving the goal of removing the oxide scale on the force-bearing seat 4, it also protects the staff.

[0039] When the force seat 4 of the small rapid forging hydraulic press moves due to the stamping of the hydraulic rod 3, the force seat 4 is often prone to shaking, which affects the forging of the metal. Therefore, the present invention provides fixed blocks 9 on both sides of the force seat 4 to prevent the force seat 4 from shaking laterally during movement, thereby affecting the forging of the metal.

[0040] When the staff uses a small rapid forging hydraulic press to forge metal, metal oxide scale often splashes around. In the present invention, the staff rotates the knob 102 clockwise, and the knob 102 drives the rotating shaft 101 to rotate. Since the rotating shaft 101 is fixedly connected to the protective cover 10, the rotating shaft 101 drives the protective cover 10 to flip upward. After the staff puts the metal to be forged on the force-bearing seat 4, they slowly release the knob 102. The protective cover 10 flips downward due to the influence of gravity, thereby covering the front side of the shell 1, so as to achieve the effect of secondary protection for the staff.

[0041] When the cleaning device 5 of the small rapid forging hydraulic press cleans the oxide scale on the force bearing seat 4, part of the oxide scale will be blown to the lower sides of the inner surface of the shell 1, and the oxide scale near the inner surface of the shell 1 is more, and the oxide scale near the fixed block 9 is less. Due to the influence of the force bearing seat 4 and the cleaning device 5 itself, the cleaning device 5 cannot remove the oxide scale of this part. In the present invention, the force bearing seat 4 is pressed by the hydraulic rod 3, and the force bearing seat 4 moves downward, thereby squeezing the air in the cavity 42 into the first jet channel 14 and the second jet channel 15, and then the first jet channel 14 and the second jet channel 15 transport the air to the protective Air is ejected from the jet hole 104 in the cover 10. Since there are more oxide scales near the shell 1, in order to better remove the oxide scales here, the jet hole 104 has a larger diameter and ejects more air. There are fewer oxide scales near the fixed block 9, and the jet hole 104 has a smaller diameter and ejects less air, so as to achieve reasonable utilization of the air in the No. 1 jet channel 14, so that most of the oxide scales on both sides of the inner surface of the shell 1 are blown to the collecting cover 6. Since the oxide scales are affected by gravity, they fall into the collecting box 7, so as to achieve the effect of removing the oxide scales on both sides of the inner surface of the shell 1.

[0042] When a small-scale rapid forging hydraulic press is forging metal, the oxide scale shed from the metal is brittle and can be easily crushed into metal particles suspended in the air. Workers often easily inhale these particles into their bodies while working, which affects their health. The present invention uses a cleaning device to blow away the oxide scale on the force-bearing seat 4 while blowing the metal particles suspended in the air in the shell 1 toward the conical cover 121. The metal particles enter the air inlet duct 12 through the conical cover 121. When the metal particles pass through the collecting tank 17, the filter screen 171 in the collecting tank 17 blocks most of the metal particles to prevent most of the metal particles from entering the cavity 42. When the filtering effect of the filter screen 171 is not good, the staff can open the sealing plug 172 to remove the metal particles in the collecting chamber and replace the filter screen 171, thereby achieving the effect of further protecting the staff.

[0043] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A rapid forging hydraulic press, comprising a housing (1), a hydraulic device (2), a hydraulic rod (3), a force bearing seat (4) and a cleaning device (5), characterized in that: The outer surface of the shell (1) is fixedly connected to a hydraulic device (2), a hydraulic rod (3) is installed in the hydraulic device (2), a through hole is opened on the upper surface of the shell (1), the hydraulic rod (3) is located in the through hole, a force bearing seat (4) is provided directly below the hydraulic rod (3), a spring (41) is fixedly connected to the lower surface of the force bearing seat (4), the other end of the spring (41) is fixedly connected to the lower surface of the shell (1), and a cavity (42) is formed between the force bearing seat (4) and the shell (1), an air outlet (11) and an air inlet (12) are opened inside the shell (1), one end of the air outlet (11) and the air inlet (12) are connected to the cavity (42), and the air outlet (11) and the air inlet (12) are connected to the cavity (42). (12) is provided with a one-way valve (13); one side of the shell (1) is rotatably connected to a cleaning device (5); the cleaning device (5) comprises a mounting frame (51), a high temperature resistant hose (52) and an air nozzle (53); the mounting frame (51) is rotatably connected to one side of the inner surface of the shell (1); a high temperature resistant hose (52) is provided in the mounting frame (51); one end of the high temperature resistant hose (52) is connected to the other end of the air outlet (11); the mounting frame (51) is fixedly connected to the air nozzle (53); the air nozzle (53) is connected to the other end of the high temperature resistant hose (52); a collection cover (6) is fixedly connected to the rear side of the shell (1); a collection box (7) is provided below the collection cover (6); A protective cover (10) is provided on the front side of the housing (1), a rotating shaft (101) is fixedly connected to the top of the protective cover (10), the protective cover (10) is rotatably connected to the housing (1) via the rotating shaft (101), a knob (102) is fixedly connected to the outer surface of one end of the rotating shaft (101), and the knob (102) is located above the motor (8), an operating window (103) is provided in the middle of the protective cover (10), and the protective cover (10) is made of a high-temperature resistant transparent material; Both sides of the lower end of the protective cover (10) are provided with jet holes (104), and the diameter of the jet holes (104) gradually decreases from the inner surface of the shell (1) to the fixed block (9). The side of the jet hole (104) close to the shell (1) is fixedly connected to a first sealing ring (105), and the first sealing ring (105) is located inside the protective cover (10). The shell (1) is provided with a first jet passage (14) and a second jet passage (15), one end of the first jet passage (14) is connected to the air outlet passage (11), and one end of the second jet passage (15) is connected to the cavity (42), and the other ends of the first jet passage (14) and the second jet passage (15) are fixedly connected to a second sealing ring (16), and the second sealing ring (16) is located inside the shell (1).

2. A rapid forging hydraulic press according to claim 1, characterized in that: A motor (8) is fixedly connected to the outer surface of the housing (1) on a side close to the cleaning device (5).

3. A rapid forging hydraulic press according to claim 1, characterized in that: A fixing block (9) is fixedly connected to the lower surface of the interior of the shell (1), and the fixing block (9) is located on both sides of the force bearing seat (4).

4. A rapid forging hydraulic press according to claim 1, characterized in that: One end of the air inlet duct (12) is fixedly connected to a conical cover (121); a collecting groove (17) is provided in the housing (1); a filter screen (171) is provided in the collecting groove (17); the collecting groove (17) is communicated with the air inlet duct (12) and is located below the air inlet duct (12); and a sealing plug (172) is rotatably connected to one side of the collecting groove (17).

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