A wastewater sampling device for environmental testing

Abstract

The present invention relates to the field of environmental detection technology, and in particular to a wastewater sampling device for environmental detection, comprising a sampler, a telescopic handle device is provided at the top of the sampler, the sampler comprises a barrel, a plurality of water intake pipes are equidistantly arranged on the outer side of the barrel from top to bottom, a filter rack is provided inside the water intake pipe, a filter rack is provided inside the filter rack, the present invention can realize layered sampling of wastewater of different depths, and impurities in the wastewater can be filtered through the filter, and at the same time, the scraper can be moved back and forth during collection so as to continuously scrape the surface of the filter to avoid clogging of the filter, and it is convenient to take out the wastewater inside, and the impurities remaining in the filter can be ejected while taking out, and the filter is further cleaned, and the telescopic handle device can be adjusted to a suitable length to adjust the water immersion depth of the sampler below, so that wastewater of a required depth can be collected, and the present invention is worthy of promotion and use.

Description

Technical Field

[0001] The invention relates to the technical field of environmental detection, and in particular to a wastewater sampling device for environmental detection. Background Art

[0002] Environmental monitoring is the use of GIS technology to design an environmental monitoring network. The information collected by environmental monitoring can be stored and displayed in a timely manner through GIS, and detailed site monitoring and analysis can be carried out in the selected evaluation area.

[0003] In environmental testing, testing of discharged wastewater is one of the more important items. When testing wastewater, it is necessary to sample it first, so a sampling device is needed. In order to prevent the entry of impurities, the existing sampling device usually sets a filter to filter impurities during sampling. However, the existing sampling device is prone to filter blockage during use, resulting in interruption of the sampling process, and the impurities remaining in the filter mesh cannot be removed after the sampling is completed, affecting subsequent use. In addition, the existing sampling device cannot perform stratified sampling of wastewater at different depths and cannot meet the sampling needs. For this reason, we propose a wastewater sampling device for environmental testing to solve this type of problem. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a wastewater sampling device for environmental testing.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] The filter screen is provided at the bottom of the filter screen, and a plurality of filter screens are provided on the top of the filter screen. The top of the driving rod passes through the partition and is movably connected to the middle of the top wall of the cylinder body, and a plurality of driving gears are fixedly mounted on the outside of the driving rod at equidistant intervals from top to bottom, and a driven gear meshing with the driving gear is fixedly mounted on the outside of the rotating rod. A plurality of liquid outlet pipes connected to the interior of the cylinder body are equidistantly arranged from top to bottom, and a one-way valve is arranged on the outside of the liquid outlet pipe, and a threaded lower part of the outer side of the rotating rod on the left side is provided with a moving block, and an L-shaped shut-off plate is fixedly mounted on the left side of the moving block, and a plurality of limiting grooves corresponding to the L-shaped shut-off plate are opened on the inner wall of the left side of the cylinder body, and a limiting block is arranged in the limiting groove, and the limiting block is fixedly connected to the opposite end of the L-shaped shut-off plate.

[0007] Preferably, the telescopic handle device includes a handle, wherein both left and right sides of the bottom end of the handle are vertically fixed with an outer rod, and an inner rod is movably installed inside the outer rod, and the bottom end of the inner rod is fixedly connected to the top end of the cylinder body, and a plurality of fixing grooves are equidistantly provided on the right side of the inner rod from top to bottom, and a fixing rod is threadedly connected to the right lower part of the outer rod on the right side, and one end of the fixing rod close to the fixing groove passes through the outer rod and extends into the fixing groove. A transmission rod is vertically movably installed in the middle of the bottom end of the handle, and a movable groove is provided inside the transmission rod, and a movable rod is provided in the movable groove, and the bottom end of the movable rod passes through the middle of the top end of the cylinder body and is fixedly connected to the top end of the driving rod, and the top end of the transmission rod passes through the middle of the bottom end of the handle and extends to the inside thereof where a transmission gear is fixedly installed, and a rack meshing with the transmission gear is provided behind the transmission gear, and an L-shaped rod is fixedly installed on the left end of the rack, and the end of the L-shaped rod away from the rack passes through the left inner wall of the handle and extends to its outside.

[0008] Preferably, a conical block is fixedly mounted on the bottom end of the cylinder.

[0009] Preferably, the number of the water intake pipes in each group is four and they are equidistantly arranged around the outside of the cylinder.

[0010] Preferably, a sealing gasket is provided at one end of the L-shaped intercepting plate away from the moving block.

[0011] Preferably, a water inlet pipe is fixedly installed on the outer end of the water intake pipe, a reciprocating screw is vertically movably installed inside the water inlet pipe, a slider is mounted on the outside of the reciprocating screw, a scraper is fixedly installed on the side of the slider close to the filter frame, the end of the scraper close to the filter is in contact with the surface of the filter, and an impeller is fixedly mounted on the upper outer side of the reciprocating screw.

[0012] Preferably, a piston body is provided outside the driving rod and at the junction with the partition.

[0013] Preferably, the movable groove is specifically a rectangular groove, and the movable rod is specifically a rectangular rod matching the movable groove.

[0014] The wastewater sampling device for environmental testing proposed by the present invention has the following beneficial effects:

[0015] 1. When the present invention is used, the fixing rod can be rotated forward to make it leave the fixing groove. At this time, the inner rod can be pulled downward to extend the overall length of the telescopic handle device. After adjusting to a suitable length, the fixing rod can be rotated in the reverse direction to make it enter the fixing groove to fix the adjusted length. The telescopic handle device can be adjusted to a suitable length to adjust the depth of the sampler below into the water, so that wastewater of a desired depth can be collected;

[0016] 2. When collecting, the sampler is placed in the wastewater, and the L-shaped rod is pressed inward to drive the rack to move accordingly, and the rack drives the transmission gear to rotate positively, and the transmission gear drives the transmission rod to rotate, thereby driving the movable rod to rotate, and the movable rod drives the driving rod to rotate positively, and the driving rod drives the driving gear to rotate, thereby driving multiple meshing driven gears to rotate positively, and the driven gear drives the rotating rod to rotate positively, and the rotating rod on the left side rotates to drive the moving block to descend, thereby driving the L-shaped intercepting plate to descend and close the outlet pipe mouth, and the rotating rod simultaneously drives the take-up drum to rotate to collect the pull rope, so that the push plate is driven to move in the direction close to the rotating rod, and the push plate drives the ejector pin to move away from the filter screen hole, and when the push plate moves, the spring is compressed to deform and generate a force, and the water inlet is gradually opened with the movement of the push plate, at this time, the wastewater enters the water intake pipe through the filter screen, and the wastewater enters the cylinder through the water inlet after the impurities are filtered out through the filter screen, and because the multiple groups of water intake pipes are arranged from top to bottom, wastewater at different levels can enter different spaces separated by the partition, thereby realizing stratified sampling;

[0017] 3. The present invention drives the impeller to rotate while the wastewater flows, so that the reciprocating screw rotates and the slider moves up and down, thereby driving the scraper to move back and forth to scrape the impurities on the surface of the filter screen to avoid clogging of the filter screen;

[0018] 4. When it is necessary to take out the internal waste water, the L-shaped rod is loosened. At this time, the spring releases the force to drive the push plate to reset, thereby realizing the reset of the ejector pin, thereby ejecting the impurities remaining in the filter mesh hole to further clean the filter mesh. At the same time, when the push plate moves, the pull rope is driven to move accordingly, so that the waste water is released from the take-up reel and the take-up reel is driven to rotate in the opposite direction, thereby realizing the reverse rotation of the rotating rod. The rotating rod drives the moving block and the L-shaped intercepting plate to rise so that the outlet pipe is opened. At this time, the internal waste liquid flows out through the liquid outlet pipe to realize the removal of the waste liquid. At the same time, the rotating rod is reversed to drive the driven gear to rotate accordingly to realize the reverse rotation of the driving gear and then realize the reverse rotation of the driving rod, so as to drive the movable rod to reverse and then realize the reverse rotation of the transmission gear to drive the rack plate to reset and realize the reset of the L-shaped rod.

[0019] The present invention can realize stratified sampling of wastewater at different depths, and can filter impurities in the wastewater through the filter screen. At the same time, the scraper can move back and forth during collection to continuously scrape the surface of the filter screen to avoid clogging of the filter screen and facilitate the removal of internal wastewater. While taking out, impurities remaining in the filter screen can be ejected, further cleaning the filter screen. The telescopic handle device can be adjusted to a suitable length to adjust the water immersion depth of the sampler below, so that wastewater of a desired depth can be collected. The present invention is worthy of promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of a wastewater sampling device for environmental testing proposed by the present invention;

[0021] Figure 2 It is a schematic diagram of the structure of the sampler proposed by the present invention;

[0022] Figure 3 This is a schematic diagram of the front view structure of the sampler proposed by the present invention;

[0023] Figure 4 It is a left-side structural schematic diagram of the sampler proposed by the present invention;

[0024] Figure 5 This is a schematic diagram of the AA structure proposed by the present invention;

[0025] Figure 6 This is a schematic diagram of the BB structure proposed by the present invention;

[0026] Figure 7 The present invention proposes Figure 2 A is an enlarged structural diagram;

[0027] Figure 8 The present invention proposes Figure 3 A schematic diagram of the enlarged structure at B;

[0028] Fig. 9 This is a schematic structural diagram of the telescopic handle device proposed in the present invention.

[0029] In the figure: sampler 1, cylinder 101, water intake pipe 102, filter frame 103, push plate 104, ejector pin 105, spring 106, water inlet 107, partition 108, rotating rod 109, take-up reel 110, pull rope 111, drive rod 112, drive gear 113, driven gear 114, liquid outlet pipe 115, moving block 116, L-shaped intercepting plate 117, limit block 118, tapered block 119, water inlet pipe 120, reciprocating screw 121, slider 122, scraper 123, impeller 124, one-way valve 125, telescopic handle device 2, handle 201, outer rod 202, inner rod 203, transmission rod 204, movable rod 205, transmission gear 206, rack 207, L-shaped rod 208, fixed groove 209, fixed rod 210. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0031] Reference Figure 1-9 A wastewater sampling device for environmental testing includes a sampler 1, a telescopic handle device 2 is provided at the top of the sampler 1, the sampler 1 includes a barrel 101, a conical block 119 is fixedly installed at the bottom of the barrel 101, and the conical block 119 is used to reduce the resistance encountered by the barrel 101 when entering the wastewater and reduce the disturbance to the water body.

[0032] Multiple groups of water intake pipes 102 are equidistantly arranged on the outside of the cylinder 101 from top to bottom. The number of water intake pipes 102 in each group is four and they are equidistantly arranged around the outside of the cylinder 101, so that wastewater can enter the cylinder 101 through multiple water intake pipes 102 for collection, thereby speeding up the collection speed.

[0033] A filter rack 103 is provided inside the water intake pipe 102, and a filter is provided inside the filter rack 103. A water inlet pipe 120 is fixedly installed on the outer end of the water intake pipe 102, and a reciprocating screw 121 is vertically movably installed inside the water inlet pipe 120. A slider 122 is mounted on the outside of the reciprocating screw 121, and a scraper 123 is fixedly installed on the side of the slider 122 close to the filter rack 103. The end of the scraper 123 close to the filter is in contact with the surface of the filter, and an impeller 124 is fixedly mounted on the upper outer side of the reciprocating screw 121. When wastewater enters the water intake pipe 102 through the water inlet pipe 120, the wastewater drives the impeller 124 to rotate, so that the reciprocating screw 121 rotates, and the slider 122 moves back and forth up and down, thereby driving the scraper 123 to move back and forth to scrape impurities on the surface of the filter to avoid clogging of the filter.

[0034] A push plate 104 is provided inside the water intake pipe 102. A plurality of ejector pins 105 matching the mesh of the filter are transversely fixedly installed on one side of the push plate 104 close to the filter. A spring 106 is fixedly installed in the middle of the side of the push plate 104 away from the filter. One end of the spring 106 away from the push plate 104 is fixedly connected to the inner wall of the water intake pipe 102. A water inlet 107 is provided on the side of the bottom end of the water intake pipe 102 away from the filter. A plurality of partitions 108 are fixedly installed equidistantly from top to bottom inside the cylinder 101. The partitions 108 are located below the water intake pipe 102. The partitions 108 between two adjacent partitions 108 and between the partitions 108 and the top and bottom walls of the cylinder 101 are vertically movable. A plurality of rotating rods 109 corresponding to the water intake pipe 102 are installed, and a pair of take-up drums 110 are fixedly mounted on the upper part of the rotating rods 109. A pull rope 111 is collected inside the take-up drum 110. The end of the pull rope 111 away from the take-up drum 110 passes through the outer side of the water intake pipe 102 and is fixedly connected to the push plate 104. A driving rod 112 is vertically movably installed in the middle of the bottom wall of the cylinder 101. The top end of the driving rod 112 passes through the partition 108 and is movably connected to the middle of the top wall of the cylinder 101. A piston body is provided on the outside of the driving rod 112 and at the junction with the partition 108. The piston body increases the airtightness of the junction between the driving rod 112 and the partition 108 to avoid water leakage.

[0035] The outside of the driving rod 112 is equidistantly fixed with a plurality of driving gears 113 from top to bottom, and the outside of the rotating rod 109 is fixed with a driven gear 114 meshing with the driving gear 113. The left side of the cylinder 101 is equidistantly provided with a plurality of liquid outlet pipes 115 connected with the inside thereof from top to bottom, and a one-way valve 125 is provided on the outside of the liquid outlet pipe 115. Through the setting of the one-way valve 125, the waste water in the cylinder 101 can be discharged through the liquid outlet pipe 115, so that the waste water outside cannot enter the cylinder 101 through the liquid outlet pipe 115. The lower outer part of the rotating rod 109 on the side is provided with a thread and a moving block 116 is threadedly mounted thereon. An L-shaped intercepting plate 117 is fixedly installed on the left side of the moving block 116. A plurality of limiting grooves corresponding to the L-shaped intercepting plate 117 are provided on the inner wall of the left side of the cylinder 101. A limiting block 118 is provided in the limiting groove. The limiting block 118 is fixedly connected to the opposite end of the L-shaped intercepting plate 117. A sealing gasket is provided at the end of the L-shaped intercepting plate 117 away from the moving block 116. The sealing gasket can increase the airtightness of the L-shaped intercepting plate 117 to the liquid outlet pipe 115.

[0036] The telescopic handle device 2 includes a handle 201, and outer rods 202 are vertically fixedly installed on the left and right sides of the bottom end of the handle 201, and an inner rod 203 is movably installed inside the outer rod 202, and the bottom end of the inner rod 203 is fixedly connected to the top of the cylinder 101, and a plurality of fixing grooves 209 are equidistantly arranged on the right side of the inner rod 203 on the right side from top to bottom, and a fixing rod 210 is threadedly connected to the lower right side of the outer rod 202 on the right side, and one end of the fixing rod 210 close to the fixing groove 209 passes through the outer rod 202 and extends into the fixing groove 209, and a transmission rod 204 is vertically movably installed in the middle of the bottom end of the handle 201, and a movable groove is opened inside the transmission rod 204, and a movable rod 205 is arranged in the movable groove, and the movable groove is specifically a rectangular groove setting, and the movable rod 205 is specifically a rectangular rod setting matching the movable groove, so that when the transmission rod 204 rotates, the movable rod 205 can be driven to rotate through the movable groove.

[0037] The bottom end of the movable rod 205 passes through the middle of the top end of the cylinder 101 and is fixedly connected to the top end of the driving rod 112. The top end of the transmission rod 204 passes through the middle of the bottom end of the handle 201 and extends to the inside where a transmission gear 206 is fixedly installed. A rack 207 meshing with the transmission gear 206 is provided behind the transmission gear 206. An L-shaped rod 208 is fixedly installed at the left end of the rack 207. The end of the L-shaped rod 208 away from the rack 207 passes through the left inner wall of the handle 201 and extends to the outside.

[0038] Working principle: When in use, the fixing rod 210 can be rotated forward to make it leave the fixing groove 209. At this time, the inner rod 203 can be pulled downward to extend the overall length of the telescopic handle device 2. After adjusting to an appropriate length, the fixing rod 210 is rotated in the opposite direction to make it enter the fixing groove 209 to fix the adjusted length. The telescopic handle device 2 can be adjusted to an appropriate length to adjust the depth of the sampler 1 below into the water, so that wastewater of a required depth can be collected. When collecting, the sampler 1 is placed in the wastewater, and the L-shaped rod 208 is pressed inward to drive the rack 207 to move accordingly. The rack 207 drives the transmission gear 206 to rotate forward, and the transmission gear 206 drives the transmission rod 204 to rotate, thereby driving the movable rod 205 to rotate. The movable rod 205 The driving rod 112 is driven to rotate forward, and the driving rod 112 drives the driving gear 113 to rotate, thereby driving the meshing multiple driven gears 114 to rotate forward, and the driven gear 114 drives the rotating rod 109 to rotate forward. The rotating rod 109 on the left rotates to drive the moving block 116 to descend, thereby driving the L-shaped intercepting plate 117 to descend and close the outlet pipe 115. The rotating rod 109 simultaneously drives the take-up drum 110 to rotate and collect the pull rope 111, so as to drive the push plate 104 to move in the direction close to the rotating rod 109, and the push plate 104 drives the ejector pin 105 to move away from the filter hole. When the push plate 104 moves, the spring 106 is compressed to deform it and generate a force. With the movement of the push plate 104, the water inlet 107 is gradually opened. Water enters the water intake pipe 102 through the filter screen. When the waste water flows, the impeller 124 is driven to rotate, so that the reciprocating screw rod 121 rotates, and the slider 122 moves up and down, thereby driving the scraper 123 to move back and forth to scrape the impurities on the surface of the filter screen to avoid clogging of the filter screen. After the impurities are filtered out by the filter screen, the waste water enters the cylinder 101 through the water inlet 107. Since the multiple groups of water intake pipes 102 are arranged from top to bottom, waste water at different levels can enter different spaces separated by the partition 108, thereby realizing stratified sampling. When it is necessary to take out the internal waste water, the L-shaped rod 208 is loosened. At this time, the spring 106 releases the force to drive the push plate 104 to reset, thereby realizing the reset of the ejector pin 105, thereby removing the filter. The impurities remaining in the mesh are pushed out to further clean the filter. At the same time, when the push plate 104 moves, the pull rope 111 is driven to move accordingly, so that the wire is released from the wire take-up drum 110, driving the wire take-up drum 110 to rotate in the opposite direction, thereby realizing the reverse rotation of the rotating rod 109. The rotating rod 109 drives the moving block 116 and the L-shaped intercepting plate 117 to rise so that the outlet pipe 115 is opened. At this time, the waste liquid inside flows out through the liquid outlet pipe 115 to realize the removal of the waste liquid. At the same time, the rotating rod 109 reverses and drives the driven gear 114 to rotate accordingly to realize the reverse of the driving gear 113 and then realize the reverse of the driving rod 112, so that the movable rod 205 is driven to reverse and then the transmission gear 206 is reversed, driving the rack plate 207 to reset and realize the reset of the L-shaped rod 208.

[0039] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A wastewater sampling device for environmental testing, comprising a sampler (1), characterized in that: The top of the sampler (1) is provided with a telescopic handle device (2), and the sampler (1) comprises a cylinder (101), and a plurality of water intake pipes (102) are arranged equidistantly from top to bottom on the outer side of the cylinder (101), and a filter rack (103) is arranged inside the water intake pipe (102), and a filter is arranged inside the filter rack (103), and a push plate (104) is arranged inside the water intake pipe (102), and a plurality of ejector pins (105) matching the mesh of the filter are transversely fixedly installed on the side of the push plate (104) close to the filter, and a spring (106) is fixedly installed in the middle of the side of the push plate (104) away from the filter, and one end of the spring (106) away from the push plate (104) is fixedly connected to the inner wall of the water intake pipe (102), and a water inlet (107) is opened on the side of the bottom end of the water intake pipe (102) away from the filter. A plurality of partitions (108) are fixedly installed at equal intervals from top to bottom inside the cylinder (101), and the partitions (108) are located below the water intake pipe (102). A plurality of rotating rods (109) corresponding to the water intake pipe (102) are vertically movably installed between two adjacent partitions (108) and between the partitions (108) and the top wall and bottom wall of the cylinder (101). A pair of take-up drums (110) are fixedly sleeved on the upper part of the rotating rods (109), and a pull rope (111) is twisted inside the take-up drum (110). The end of the pull rope (111) away from the take-up drum (110) passes through the outer side of the water intake pipe (102) and is fixedly connected to the push plate (104). A driving rod (112) is vertically movably installed in the middle of the bottom wall of the cylinder (101). The top end of the driving rod (112) passes through the partition (108) and is movably connected to the middle of the top wall of the cylinder (101). The outside of the driving rod (112) is fixedly sleeved with a plurality of driving gears (113) equidistantly from top to bottom. The outside of the rotating rod (109) is fixedly sleeved with a driven gear (114) meshing with the driving gear (113). The left side of the cylinder (101) is equidistantly provided with a plurality of liquid outlet pipes (115) connected to the inside thereof from top to bottom. The outside of the liquid outlet pipe (115) is provided with a one-way valve (125). The lower part of the outer side of the rotating rod (109) on the left side is provided with a thread and is threadedly sleeved with a moving block (116). The left side of the moving block (116) is fixedly installed with an L-shaped intercepting plate (117). The left inner wall of the cylinder (101) is provided with a plurality of liquid outlet pipes (115) connected to the L-shaped intercepting plate (117). A corresponding limiting groove, wherein a limiting block (118) is provided in the limiting groove, and the limiting block (118) is fixedly connected to an opposite end of the L-shaped intercepting plate (117);The telescopic handle device (2) comprises a handle (201), and outer rods (202) are vertically fixedly installed on both left and right sides of the bottom end of the handle (201), and an inner rod (203) is movably installed inside the outer rod (202), and the bottom end of the inner rod (203) is fixedly connected to the top end of the cylinder (101), and a plurality of fixing grooves (209) are equidistantly arranged on the right side of the right inner rod (203) from top to bottom, and a fixing rod (210) is threadedly connected to the lower right side of the right outer rod (202), and one end of the fixing rod (210) close to the fixing groove (209) passes through the outer rod (202) and extends into the fixing groove (209), and a transmission rod (204) is vertically movably installed in the middle of the bottom end of the handle (201), and a movable groove is provided inside the transmission rod (204), and a movable rod (205) is provided in the movable groove. The bottom end of the movable rod (205) passes through the middle of the top end of the cylinder (101) and is fixedly connected to the top end of the driving rod (112). The top end of the transmission rod (204) passes through the middle of the bottom end of the handle (201) and extends to the inside of which a transmission gear (206) is fixedly installed. A rack (207) meshing with the transmission gear (206) is provided behind the transmission gear (206). The left end of the rack (207) is fixedly installed with an L-shaped rod (208). , the end of the L-shaped rod (208) away from the rack (207) passes through the left inner wall of the handle (201) and extends to the outside thereof; a conical block (119) is fixedly installed at the bottom end of the cylinder (101); a sealing gasket is provided at the end of the L-shaped intercepting plate (117) away from the moving block (116); the sealing gasket can increase the sealing performance of the L-shaped intercepting plate (117) to the liquid outlet pipe (115); the movable groove is specifically a rectangular groove, and the movable rod (205) is specifically a rectangular rod matching the movable groove; a piston body is provided outside the driving rod (112) and at the junction with the partition (108). ; 2. The wastewater sampling device for environmental testing according to claim 1, characterized in that: The number of the water intake pipes (102) in each group is specifically four and they are arranged around the outside of the cylinder (101) at equal intervals.

3. The wastewater sampling device for environmental testing according to claim 1, characterized in that: A water inlet pipe (120) is fixedly mounted on the outer end of the water intake pipe (102), a reciprocating screw (121) is vertically movably mounted inside the water inlet pipe (120), a sliding block (122) is sleeved on the outside of the reciprocating screw (121), a scraper (123) is fixedly mounted on the side of the sliding block (122) close to the filter frame (103), the end of the scraper (123) close to the filter is in contact with the surface of the filter, and an impeller (124) is fixedly sleeved on the upper outer side of the reciprocating screw (121).

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