A wet type filter for metal dust used in a plant

Abstract

The present application relates to the technical field of pollution control, in particular to a workshop metal dust wet filter, comprising a water tank, two groups of filter boxes are arranged on the water tank, the upper parts of the two filter boxes are connected and communicated with air guide cylinders, the front ends of the air guide cylinders are rotatably connected with and communicated with air suction pipes one, the outer walls of the air suction pipes one are connected and communicated with manifold pipes, air suction assemblies are arranged on the two groups of filter boxes, bypass assemblies are further arranged on the filter boxes, rotating assemblies are arranged on the air suction assemblies, and buffer assemblies are arranged on the water tank. Through the arrangement of the two groups of filter boxes, when internal parts of the filter boxes fail, are blocked or the like in continuous dust removal and filtration work, the position of the air suction assembly is switched, the communication between the filter box and the air suction assembly is blocked, and the air suction effect is applied to a single filter box, so that the parts in the other filter box can be maintained and replaced under the condition of no shutdown.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pollution control, in particular to a wet filter for metal dust used in a workshop. BACKGROUND

[0002] In the production process of a metal processing workshop, metal powder is generated to different degrees during cutting, grinding and other processing operations of metal products. These metal powders floating in the air not only pollute the environment, but also increase the risk of explosion in serious cases. Therefore, a filter needs to be used in the workshop to capture and filter metal powder.

[0003] The existing wet filter often adopts an integrated design, and the water tank, water spray pipe, filter filler and negative pressure fan are installed in the device from bottom to top. However, under the current high-intensity production conditions in most factories, the internal components of the water spray pipe and filter filler need to be maintained or replaced within a certain period. However, the device needs to be shut down during this process, which affects the realization of the workshop's dust removal and filtration requirements. In addition, the negative pressure fan needs to be set at the top of the device due to the need for air extraction, which requires personnel to operate at a high place during maintenance. This not only poses a certain safety risk, but also leads to poor maintenance efficiency when repeated climbing is not successful. SUMMARY

[0004] In order to overcome the deficiencies of the prior art, the present application provides a wet filter for metal dust used in a workshop.

[0005] To solve the above technical problems, the application provides the following technical scheme: a wet filter for metal dust in a workshop, comprising a water tank, two groups of filter boxes are arranged on the water tank, the back surfaces of the two groups of filter boxes are open and are provided with box doors, a spraying bin and a filtering bin are arranged in the filter boxes from bottom to top, an air inlet is arranged on the front lower part of the filter box, a gas guide cylinder is connected to and communicates with the upper parts of the two filter boxes, the front end of the gas guide cylinder extends to the front side of the filter box, a first air suction pipe is rotatably connected to and communicates with the front end of the gas guide cylinder, a branch pipe is connected to and communicates with the outer wall of the first air suction pipe, the two branch pipes are staggered in front and back, an air suction assembly is arranged on the two groups of filter boxes, a path switching assembly for switching the path of the air suction assembly and the gas guide cylinder is further arranged on the filter box, the path switching assembly comprises a shunt plate, the shunt plate is connected to the first air suction pipe and the branch pipe on the side surface, a through hole is formed in the shunt plate and communicates with the first air suction pipe and the branch pipe, a switching plate is slidably arranged on the side surface of the shunt plate, a second air suction pipe is arranged in the center of the switching plate and is connected to the first air suction pipe, the free end of the second air suction pipe is rotatably connected to the air suction assembly, the sliding of the switching plate on the shunt plate enables the air suction assembly to move forward and backward and switch the path of the filter box after moving, the path switching assembly further comprises a vertical frame, the vertical frame is connected to the water tank on the rear side of the filter box, guide rails II are connected to the two side surfaces of the vertical frame, a sliding seat II is slidably arranged on the guide rails II, a motor frame is connected to the sliding seat II, a driving motor is arranged on the motor frame, a driving shaft of the driving motor is connected with a driving gear, a driven gear is rotatably connected to the motor frame, the driving gear is engaged with the driven gear, a screw rod is connected to the center shaft of the driven gear, a through hole is formed in the switching plate and is connected to the screw rod through a rotating bearing, and the screw rod extends forward and is threadedly connected to the air suction bin.

[0006] As a preferred technical scheme of the application, the air suction assembly is provided with a rotating assembly for driving the shunt plate and the switching plate to rotate, the rotating assembly can rotate the shunt plate and the switching plate from the upper side to the front side, so that the forward and backward sliding of the switching plate on the shunt plate is changed to upward and downward sliding, and the water tank is provided with a buffer assembly for providing buffer support when the air suction assembly is lowered.

[0007] As a preferred technical scheme of the application, the through hole of the shunt plate communicating with the first air suction pipe and the branch pipe is connected with a sealing ring, and the sealing ring abuts against the switching plate.

[0008] As a preferred technical scheme of the application, the air suction assembly comprises an air suction bin, a roller is arranged on the bottom surface of the air suction bin, the free end of the second air suction pipe is rotatably connected to the air suction bin through a flange bearing, the inside of the air suction bin communicates with the second air suction pipe, a fan bin is connected to the air suction bin, a negative pressure fan is arranged in the fan bin, and the outlet of the negative pressure fan penetrates the air suction bin.

[0009] As a preferred technical scheme of the present application, the buffer assembly comprises a buffer cylinder connected to the lower part of the vertical frame, a piston sleeved in the buffer cylinder, a pull rope connected to the top of the buffer cylinder and penetrating through the buffer cylinder, a pulley rotatably installed on the top of the vertical frame, the free end of the pull rope penetrating through the pulley and connected to the motor frame, a return spring connected between the bottom surface of the piston and the buffer cylinder, and a plurality of small air holes formed in the top surface of the buffer cylinder.

[0010] As a preferred technical scheme of the present application, the vertical frame is provided with positioning plates on both sides of the pull rope, the positioning plates are rotatably connected with clamping frames, the two clamping frames abut against the two sides of the pull rope, the surfaces of the clamping frames are provided with gear teeth corresponding to the positions of the pull rope, the pull rope is a steel strand rope, one of the positioning plates is rotatably provided with a control rod, the end of the control rod is connected with the central shaft of the clamping wheel, and the vertical frame is provided with a positioning plate abutting against the top surface.

[0011] As a preferred technical scheme of the present application, the shunt plate is provided with a limiting hole in the rear side, and the switching plate is provided with a sliding block connected to the position corresponding to the limiting hole in the rear side.

[0012] As a preferred technical scheme of the present application, the rotating assembly comprises a turnover gear, the outer wall of the second air suction pipe is connected with an annular turnover gear, a support is connected to the side surface of the air suction chamber, a driving motor is installed on the support, a driving gear is connected to the transmission shaft of the driving motor, and the driving gear is engaged with the turnover gear.

[0013] Compared with the prior art, the present application has the following beneficial effects:

[0014] 1. Through the arrangement of the two groups of filter boxes, when the internal components of the filter boxes fail or are blocked during continuous dust removal and filtration, the communication between the filter box and the air suction assembly is blocked by switching the position of the air suction assembly, and the air suction effect is applied to the single filter box, so that the components in the other filter box can be maintained and replaced without stopping, thereby prolonging the service life of the filter equipment and ensuring effective dust removal and filtration of metal dust in the workshop during maintenance and replacement.

[0015] 2. Through the arrangement of the rotating assembly, when the air suction assembly needs to be maintained, the shunt plate and the switching plate are rotated to the front side of the filter box, the front and rear sliding function of the switching plate on the shunt plate is switched to the up and down sliding function, the air suction assembly can fall on the front side of the filter box on the upper side of the filter box, the height of the air suction assembly is reduced to facilitate the implementation of the maintenance operation, and the switching plate on the shunt plate provides support to the air suction assembly, thereby improving the stability of the air suction assembly during maintenance.

[0016] 3. The position of the switching component is controlled by the driving motor, which can realize the lifting of the switching component before switching to the front side of the filter box and switching the communication with the filter box. Compared with the direct use of the electric valve to control the passage, the single device can realize multiple functions, and the cost of using the electric valve is increased, the failure rate of the electric valve itself is high, the device failure rate is increased, and the difficulty of maintenance is increased.

[0017] 4. By setting the buffer assembly, the falling speed of the air exchange assembly can be controlled by generating resistance during the automatic falling of the air exchange assembly, so as to avoid the collision risk of the air suction chamber to people or objects due to the too fast falling speed, and improve the stability. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a front side structure schematic diagram of the application;

[0019] Figure 2 It is a rear side structure schematic diagram of the application;

[0020] Figure 3 It is a rear side structure schematic diagram of the vertical frame of the application;

[0021] Figure 4 It is a front side structure schematic diagram of the vertical frame of the application;

[0022] Figure 5 It is a structure schematic diagram of the branch plate of the application;

[0023] Figure 6 It is a structure schematic diagram of the rotating assembly of the application.

[0024] Wherein: 10, water tank; 11, filter box; 12, spraying chamber; 13, filter chamber; 14, air guide cylinder; 15, air suction pipe one; 16, branch pipe; 17, branch plate; 18, switching plate; 19, air suction pipe two; 20, air suction chamber; 21, fan chamber; 22, guide rail one; 23, sliding seat one; 24, sealing ring; 25, vertical frame; 26, guide rail two; 27, sliding seat two; 28, motor frame; 29, driving gear; 30, driven gear; 31, screw rod; 32, buffer cylinder; 33, piston; 34, pull rope; 35, pulley; 36, return spring; 37, positioning plate; 38, clamping frame; 39, clamping wheel; 40, control rod; 41, limiting hole; 42, sliding block; 43, overturning gear; 44, shifting gear; 45, shifting motor; 46, driving motor. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the present application is further described below in combination with specific examples, but the following examples are only preferred embodiments of the present application, not all. Based on the examples in the embodiments, other examples obtained by those skilled in the art without creative labor are within the protection scope of the present application. In the following examples, the experimental methods are conventional methods, and the materials and reagents used in the following examples are commercially available unless otherwise specified.

[0026] Example: As Figures 1-6As shown, a workshop metal dust wet filter, comprising a water tank 10, the water tank 10 is provided with two groups of filter box 11, the filter box 11 bottom and water tank 10 inside communication, two groups of filter box 11 is left and right distribution, the two groups of filter box 11 of the face away from the opening and is provided with box door, filter box 11 from bottom to top is provided with spray storehouse 12 and filter storehouse 13, spray storehouse 12 is evenly distributed with water pipe and nozzle, water pipe is used for connecting water pump, nozzle sprays water to capture dust particles, filter storehouse 13 is slidably connected with several filter plates, the filter plate is filled with filter filler, for further filtering the dust in the gas, the front of filter box 11 is provided with air inlet, the upper part of two filter box 11 is connected and communicated with the gas guide cylinder 14, the front end of gas guide cylinder 14 extends to the front side of filter box 11, the front end of gas guide cylinder 14 is rotatably connected with and communicated with the suction pipe one 15 through flange bearing, suction pipe one 15 is Z-shaped, the free end of two suction pipe one 15 is located in the transverse center line position of filter box 11, the outer wall of suction pipe one 15 is connected and communicated with the manifold pipe 16, the free end of suction pipe one 15 and manifold pipe 16 is parallel, two manifold pipes 16 are staggered distribution, two groups of filter box 11 are provided with suction assembly, the suction assembly is provided with negative pressure fan for realizing the function of suction, the filter box 11 is also provided with a switching component for switching the passage of suction assembly and gas guide cylinder 14, the switching component comprises a shunt plate 17, the shunt plate 17 is connected on the side of suction pipe one 15 and manifold pipe 16, the shunt plate 17 is provided with through hole communicated with suction pipe one 15 and manifold pipe 16, the upper and lower surfaces of shunt plate 17 are connected with guide rail one 22, the guide rail one 22 is slidably installed with slide seat one 23, the slide seat one 23 is connected with switching plate 18, the switching plate 18 is connected with suction pipe two 19, the free end of suction pipe two 19 is rotatably connected with suction assembly, the switching plate 18 is slid on the shunt plate 17, so that the suction assembly can move forward and backward and switch the passage connected with filter box 11 after moving, the suction assembly is provided with a rotating assembly for driving the rotation of shunt plate 17 and switching plate 18, the rotating assembly can rotate shunt plate 17 and switching plate 18 from the upper side of filter box 11 to the front side of filter box 11, so that the forward and backward sliding function of switching plate 18 on shunt plate 17 changes to upward and downward sliding function, the water tank 10 is provided with a buffer assembly for providing buffer support when the suction assembly is lowered.

[0027] Specifically, in the normal state, the air suction assembly is located at the transverse center line of the filter box 11, the air suction assembly is communicated with the two air suction pipes 15, then the negative pressure fan is started to generate the air suction function, the metal dust in the workshop enters the filter box 11 along with the airflow through the air inlet, then the spray bin 12 captures the dust particles by spraying water to filter the metal dust, the captured metal dust flows into the water tank 10 along with the water to be collected, the filtered airflow continues to flow upwards in the filter box 11 along with the negative pressure, and when passing through the filter bin 13, the metal dust is further filtered by the filler for filtering, the clean airflow filtered of the metal dust is sucked into the negative pressure fan and then discharged through the outlet. When it is necessary to maintain or replace the parts inside the filter box 11, the air suction assembly is pushed to make the switching plate 18 slide on the shunt plate 17, so that the air suction pipe two 19 corresponds to the branch pipe 16 to be used, and the air suction pipe one 15 and the branch pipe 16 on the other side are both blocked by the switching plate 18, so that the air suction function of the air suction assembly corresponds to only a single filter box 11, thereby enabling the maintenance and replacement of the parts inside the filter box 11 without stopping the dust removal and filtration. When it is necessary to maintain the air suction assembly, the air suction assembly is first pushed to the front side of the filter box 11, so that the rotating shaft of the air suction pipe one 15 on the air guide cylinder 14 corresponds to the rotating shaft of the air suction pipe two 19 on the air suction assembly, the rotating assembly makes the shunt plate 17 and the switching plate 18 rotate by ninety degrees forward, so that the switching plate 18 can rise and fall on the shunt plate 17, and the air suction assembly also has the function of rising and falling, so that the air suction assembly can be lowered from the upper side of the filter box 11 to the front side of the filter box 11 for maintenance and other operations of the air suction assembly.

[0028] As shown in Figure 5 , the through hole of the shunt plate 17 connected with the air suction pipe one 15 and the branch pipe 16 is connected with a sealing ring 24, and the sealing ring 24 abuts against the switching plate 18.

[0029] Specifically, the sealing ring 24 is used to increase the sealing performance when the air suction pipe one 15 and the branch pipe 16 are communicated or closed by the switching plate 18, thereby ensuring the stability of the air suction effect.

[0030] As shown in Figure 2 and Figure 6 , the air suction assembly comprises an air suction bin 20, the bottom surface of the air suction bin 20 is provided with a roller, the free end of the air suction pipe two 19 is rotatably connected to the air suction bin 20 through a flange bearing, the inside of the air suction bin 20 is communicated with the air suction pipe two 19, and a fan bin 21 is connected to the air suction bin 20, a negative pressure fan (not shown in the figure) is arranged in the fan bin 21, and the outlet of the negative pressure fan penetrates through the air suction bin 20.

[0031] Specifically, through the start of the negative pressure fan, the air extraction effect is extracted to the filter box 11 through the path of the air extraction warehouse 20-air extraction pipe two 19-switching plate 18-shunt plate 17-air extraction pipe one 15 or branch pipe 16, so as to extract the metal dust in the workshop into the filter box 11 for wet dust removal and filtration.

[0032] As shown in Figure 2 and Figure 3 The switching assembly further comprises a vertical frame 25 connected to the water tank 10 at the rear side of the filter box 11, both sides of the vertical frame 25 are connected with guide rails two 26, the guide rails two 26 are slidingly installed with sliding seats two 27, the sliding seats two 27 are connected with motor frames 28, the motor frames 28 are installed with driving motors 46, the driving motors 46 are connected with driving gears 29 through transmission shafts, the motor frames 28 are rotatably connected with driven gears 30, the driving gears 29 are engaged with the driven gears 30, the driven gears 30 are connected with screws 31 through center shafts, the switching plate 18 is connected with the screws 31 through a rotating bearing, and the screws 31 are forwardly extended and threadedly connected with the air extraction warehouse 20.

[0033] Specifically, the driving motors 46 are started to drive the driving gears 29 to rotate, the driven gears 30 are driven to rotate through the engagement with the driving gears 29, and the air extraction warehouse 20 threadedly connected with the screws 31 is moved forward and backward along the rotating direction of the screws 31, the air extraction warehouse 20 is driven to move forward and backward to switch the switching plate 18 to communicate with the air extraction pipe one 15 and the branch pipe 16, and the switching plate 18 is lifted on the shunt plate 17 to fall down.

[0034] As shown in Figure 3 The buffer assembly comprises a buffer cylinder 32 connected to the lower part of the vertical frame 25, a piston 33 sleeved in the buffer cylinder 32, the piston 33 being slidingly movable up and down in the buffer cylinder 32, a pull rope 34 connected to the top of the buffer cylinder 32, the pull rope 34 penetrating through the buffer cylinder 32, a pulley 35 rotatably installed on the top of the vertical frame 25, the free end of the pull rope 34 penetrating through the pulley 35 and connected with the motor frame 28, a return spring 36 connected between the bottom surface of the piston 33 and the buffer cylinder 32, and a plurality of small air holes formed in the top surface of the buffer cylinder 32.

[0035] Specifically, after the screw rod 31 rotates to drive the air suction bin 20 to move to the front side of the filter box 11, the rotating assembly rotates the shunt plate 17 and the switching plate 18, and then the air exchange assembly is lowered on the shunt plate 17 through the lifting function of the switching plate 18, the screw rod 31 connected with the air suction bin 20 drives the motor frame 28 to slide on the vertical frame 25, in the sliding process, the pull rope generates an upward pulling force on the piston 33, and pulls the piston 33 to slide in the buffer barrel 32, when the piston 33 slides in the buffer barrel 32, the air in the buffer barrel 32 is extruded, and the buffer barrel 32 has limited air exhaust capacity, so that the extruded air generates resistance on the piston 33, and then limits the pulling force of the pull rope, so that the descending speed of the air suction bin 20 is limited, and the collision risk of the air suction bin 20 to people or objects caused by too fast descending speed is avoided.

[0036] As shown in Figure 3 , the vertical frame 25 is connected with the positioning plate 37 on both sides of the middle part of the vertical frame 25, the positioning plate 37 is rotatably connected with the clamping frame 38, the two clamping frames 38 abut the two sides of the pull rope 34 respectively, the surface of the clamping frame 38 is provided with a gear corresponding to the position of the pull rope 34, the pull rope 34 is a steel strand rope, and the control rod 40 is rotatably installed on one of the positioning plates 37. The control rod 40 is in a Z shape, the end of the control rod 40 is connected with the center axis of the clamping wheel 39, and the vertical frame 25 is connected with the positioning plate 37 abutting the top surface.

[0037] Specifically, the control rod 40 drives the clamping wheel 39 to rotate, the clamping wheel 39 clamps the pull rope 34 to pull the pull rope 34, so that the air suction assembly can be lifted to the upper side of the filter box 11, then the driving motor 46 drives the screw rod 31 to rotate to move the air suction assembly to the upper side of the filter box 11 to realize resetting, after the pull rope 34 is pulled, the reset spring 36 pulls the piston 33 to reset through rebound, and the positioning plate 37 is used to limit the highest position of the pull rope 34, which is the position of the air suction assembly corresponding to the upper side of the filter box 11.

[0038] As shown in Figure 5 and Figure 6 , the rear side of the shunt plate 17 is provided with a long strip-shaped limiting hole 41, and the rear side of the switching plate 18 is connected with the sliding block 42 corresponding to the position of the limiting hole 41.

[0039] Specifically, when the switching plate 18 slides to the bottom of the shunt plate 17, the bottom side of the limiting hole 41 is clamped with the sliding block 42, the descending degree of the air suction assembly is limited, and a supporting effect is generated on both sides of the air suction assembly.

[0040] As shown in Figure 6As shown, the rotating assembly comprises a turnover gear 43, the outer wall of the air suction pipe two 19 is connected with the annular turnover gear 43, the side of the air suction chamber 20 is connected with a support, the support is installed with a push motor 45, the transmission shaft of the push motor 45 is connected with a push gear 44, the push gear 44 is engaged with the turnover gear 43, and the push motor 45 adopts a self-locking motor type.

[0041] Specifically, when the air suction assembly moves to the corresponding position of the rotating shaft of the air suction pipe one 15 on the air guide cylinder 14 and the rotating shaft of the air suction pipe two 19 on the air suction chamber 20, the push motor 45 is started to drive the push gear 44 to rotate, the push gear 44 drives the air suction pipe two 19 to rotate through the engagement with the turnover gear 43, so that the shunt plate 17 and the switching plate 18 are rotated from horizontal to vertical, then when the sliding track of the switching plate 18 on the shunt plate 17 is consistent with the sliding track of the motor frame 28 on the vertical frame 25, the push motor 45 is stopped and self-locked, the air suction assembly automatically descends until the sliding block 42 abuts against the limiting hole 41, so that the air suction assembly is lowered from high to low for maintenance and repair.

[0042] It should be noted that the motion control of the device structure is realized by setting a sensor, which is a known technology and will not be described here.

[0043] Working principle:

[0044] Before use: the negative pressure fan is started, the metal dust in the workshop is sucked into the air inlet of the filter box 11 along with the air, after the dust removal and filtration of the spray chamber 12 and the filter chamber 13, a large amount of metal dust falls into the water tank 10, and a small amount of metal dust is filtered by the filter filler.

[0045] In use: first, when the parts in the filter box 11 need to be maintained and replaced, the drive motor 46 is started to push the air suction chamber 20 to move, so that the air suction pipe two 19 corresponds to the shunt pipe 16 on one side of the filter box 11, at this time the other side of the filter box 11 is blocked, so that the parts in the filter box 11 can be maintained and replaced without stopping.

[0046] Second, when the parts such as the negative pressure fan located above the filter box 11 need to be maintained and replaced, the drive motor 46 is started to push the fan chamber 21 to move to the front side of the filter box 11 until the rotating shafts of the air guide cylinder 14 and the air suction pipe two 19 correspond, then the push motor 45 is started to drive the shunt plate 17 and the switching plate 18 to rotate by ninety degrees, when the sliding track of the switching plate 18 on the shunt plate 17 is consistent with the sliding track of the motor frame 28 on the vertical frame 25, the air suction assembly automatically descends to the low place for maintenance and replacement.

[0047] After use: after maintenance and replacement, the above-mentioned actions are reversed to reset.

[0048] The embodiments of the present application are described in detail above with reference to the accompanying drawings, but the present application is not limited to the embodiments, and various changes can be made by those skilled in the art within the scope of knowledge acquired from the present disclosure, without departing from the spirit of the present application.

Claims

1. A wet filter for metal dust in a workshop, comprising a water tank (10), characterized in that: Two groups of filter boxes (11) are provided on the water tank (10), and the two groups of filter boxes (11) are open on their opposite sides and provided with box doors. A spray chamber (12) and a filter chamber (13) are provided in the filter box (11) from bottom to top. An air inlet is provided at the lower front portion of the filter box (11). The upper portions of the two filter boxes (11) are connected to and communicated with an air guide cylinder (14). The front end of the air guide cylinder (14) extends to the front side of the filter box (11). The front end of the air guide cylinder (14) is rotatably connected to and communicated with an exhaust pipe (15). The outer wall of the exhaust pipe (15) is connected to and communicated with a manifold pipe (16). The two manifold pipes (16) are staggered in front and back. The two groups of filter boxes (11) are provided with an air extraction assembly, and the filter box (11) is also provided with a switching assembly for switching the passage between the air extraction assembly and the air guide cylinder (14); The switching assembly includes a branch plate (17), the side of the branch plate (17) is connected to the exhaust pipe (15) and the branch pipe (16), the branch plate (17) is provided with a through hole connected to the exhaust pipe (15) and the branch pipe (16), the side of the branch plate (17) is slidably mounted with a switching plate (18), the center surface of the switching plate (18) is opened and connected to the exhaust pipe (19), the free end of the exhaust pipe (19) is rotatably connected to the exhaust assembly, and the exhaust assembly can be moved forward and backward by sliding the switching plate (18) on the branch plate (17) and switch the passage connected to the filter box (11) after the movement; The air extraction assembly is provided with a rotating assembly for driving the branch plate (17) and the switching plate (18) to rotate. The rotating assembly can rotate the branch plate (17) and the switching plate (18) from the upper side to the front side, so that the switching plate (18) changes from sliding forward and backward on the branch plate (17) to sliding up and down. The water tank (10) is provided with a buffer assembly for providing buffer support when the air extraction assembly descends.

2. A wet filter for metal dust in a workshop according to claim 1, characterized in that: The through hole opening of the branch plate (17) communicating with the exhaust pipe (15) and the branch pipe (16) is connected with a sealing ring (24), and the sealing ring (24) abuts against the switching plate (18).

3. A wet filter for metal dust in a workshop according to claim 1, characterized in that: The exhaust assembly includes an exhaust bin (20), a roller is installed on the bottom surface of the exhaust bin (20), the free end of the exhaust pipe (19) is rotatably connected to the exhaust bin (20) through a flange bearing, the interior of the exhaust bin (20) is communicated with the exhaust pipe (19), the exhaust bin (20) is connected to a fan bin (21), a negative pressure fan is arranged in the fan bin (21), and the outlet of the negative pressure fan passes through the exhaust bin (20).

4. A wet filter for metal dust in a workshop according to claim 3, characterized in that: The switching assembly further comprises a vertical frame (25), the vertical frame (25) being connected to the water tank (10) at the rear side of the filter box (11), the two sides of the vertical frame (25) being connected to a guide rail 2 (26), a slide seat 2 (27) being slidably mounted on the guide rail 2 (26), a motor frame (28) being connected to the slide seat 2 (27), a driving motor (46) being mounted on the motor frame (28), a transmission shaft of the driving motor (46) being connected to a driving gear (29), a driven gear (30) being rotatably connected to the motor frame (28), the driving gear (29) being meshed with the driven gear (30), a central axis of the driven gear (30) being connected to a screw (31), a hole being opened on the switching plate (18) and being connected to the screw (31) through a rotating bearing, the screw (31) extending forward and being threadedly connected to the air extraction chamber (20).

5. A wet filter for metal dust in a workshop according to claim 4, characterized in that: The buffer assembly includes a buffer cylinder (32), the buffer cylinder (32) is connected to the lower part of the vertical frame (25), a piston (33) is sleeved in the buffer cylinder (32), a pull rope (34) is connected to the top of the buffer cylinder (32), the pull rope (34) runs through the buffer cylinder (32), a pulley (35) is rotatably installed on the top of the vertical frame (25), the free end of the pull rope (34) passes through the pulley (35) and is connected to the motor frame (28), a reset spring (36) is connected between the bottom surface of the piston (33) and the buffer cylinder (32), and a plurality of fine air holes are opened on the top surface of the buffer cylinder (32).

6. A wet filter for metal dust in a workshop according to claim 5, characterized in that: The middle part of the vertical frame (25) is connected to a positioning plate (37) on both sides of the pull rope (34), and a clamping frame (38) is rotatably connected to the positioning plate (37). The two clamping frames (38) respectively contact the two sides of the pull rope (34). The surface of the clamping frame (38) is provided with gear teeth corresponding to the position of the pull rope (34). The pull rope (34) is a steel rope. A control rod (40) is rotatably installed on one of the positioning plates (37). The end of the control rod (40) is connected to the central axis position of the clamping wheel (39). The vertical frame (25) is connected to a positioning plate (37) that contacts the top surface.

7. A wet filter for metal dust in a workshop according to claim 4, characterized in that: A limiting hole (41) is provided on the rear side of the branch plate (17), and a slider (42) is connected to a position on the rear side of the switching plate (18) corresponding to the limiting hole (41).

8. A wet filter for metal dust in a workshop according to claim 7, characterized in that: The rotating assembly includes a flip gear (43), the outer wall of the second air extraction pipe (19) is connected to a ring-shaped flip gear (43), the side of the air extraction chamber (20) is connected to a bracket, a toggle motor (45) is installed on the bracket, the transmission shaft of the toggle motor (45) is connected to a toggle gear (44), and the toggle gear (44) is engaged with the flip gear (43).

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