Foundation pit drainage pump structure

Abstract

The invention relates to the technical field of water pumps, in particular to a foundation pit drainage pump structure which mainly comprises a vehicle body, a drainage mechanism, a filtering mechanism, a water storage tank, a water inlet pipe, a water outlet pipe, a water inlet pipe, a water outlet pipe and a water outlet pipe, the filtering mechanism is arranged above the vehicle body, and the knocking mechanism is arranged above the vehicle body. When foundation pit water is sucked through a connecting shell, water flow enters the connecting shell and is filtered by a filter plate, soil is filtered below the filter plate, meanwhile, the water flow pushes fan blades to rotate, the fan blades drive a connecting shaft and a scraping plate to rotate, and the scraping plate scrapes the soil at the bottom of the filter plate; in the rotating process of the scraping plate, soil in water flow is centrifugally dispersed to the edge, the heavier soil is scraped and dispersed to fall into the fixed pipe, so that the soil cannot block the filter plate and the connecting shell, and then the drainage efficiency of the foundation pit is improved.

Description

Technical Field

[0001] This invention relates to the field of water pump technology, specifically to a foundation pit drainage pump structure. Background Technology

[0002] When a plunger drainage pump is working, as the plunger moves backward within the pump cylinder, the volume of the space behind the plunger increases, creating a vacuum. Liquid in the inlet pipe is then drawn into the pump cylinder under atmospheric pressure. The plunger then pushes forward, compressing the liquid inside the pump cylinder and increasing its pressure. The liquid is then discharged through the outlet valve to the desired location. This process is repeated continuously, achieving continuous drainage. It is widely used in various fields, especially in deep foundation pit construction, where drainage is crucial due to the depth and potential for water accumulation.

[0003] When draining water from the foundation pit, a plunger pump is used to draw the water out of the pit. However, when existing plunger pumps draw water from the foundation pit, the water contains a lot of mud and the pumps lack proper filtration. As the water is drawn out and drained over a long period of time, the mud in the pit tends to accumulate inside the pump, causing blockage and affecting the efficiency of the foundation pit drainage. Summary of the Invention

[0004] The purpose of this invention is to provide a foundation pit drainage pump structure to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A foundation pit drainage pump structure includes: a vehicle body, a motor and a fixed housing mounted on the top surface of the vehicle body, a suction shell mounted at one end of the fixed housing, a connecting shell mounted at one end of the suction shell, an outlet on the side of the connecting shell, and an inlet at the lower end of the connecting shell; and further includes: The drainage mechanism is located on the top of the vehicle body. The drainage mechanism includes a plunger that is slidably installed on the inner wall of the suction shell, a fixed frame that is fixedly installed on the inner wall of the connecting shell, a sealing plate 2 that is located below the fixed frame, and a roller that is located below the sealing plate 2. The filter mechanism is located on the upper part of the vehicle body. A filter plate is fixedly installed on the inner wall of the connecting shell. A connecting shaft is rotatably installed on the inner wall of the filter plate through a bearing. A scraper is fixedly installed on the outer wall of the lower end of the connecting shaft. The striking mechanism is located on the upper part of the vehicle body. The striking mechanism includes a fixed block that is fixedly installed on the inner wall of the connecting shell, and a striking head is provided below the fixed block.

[0006] Preferably, a pulley is fixedly installed on the outer wall of the motor output rod, and a rotating shaft is rotatably installed on the side of the fixed housing through a bearing. A pulley is fixedly installed on the outer wall of one end of the rotating shaft, and the pulley is connected to the pulley 1 by a belt.

[0007] Preferably, a turntable one is fixedly installed on the outer wall of one end of the rotating shaft, and a turntable two is fixedly connected to the side edge of the turntable one via a fixing post. A connecting arm is rotatably installed on the outer wall of the fixing post, and the other end of the connecting arm is hinged to one end of the plunger.

[0008] Preferably, a sealing ring is fixedly installed on the inner wall of the suction shell, and the inner wall of the sealing ring is slidably connected to the outer wall of the plunger. A sealing cap is installed on the top of the connecting shell, a fixing rod is slidably installed on the inner wall of the sealing cap, a sealing plate is fixedly installed at the lower end of the fixing rod, and an elastic element is slidably installed on the outer wall of the fixing rod. The two ends of the elastic element are fixedly connected to the bottom surface of the sealing cap and the top surface of the sealing plate.

[0009] Preferably, a second fixing rod is slidably installed on the inner wall of the fixing frame, the lower end of the second fixing rod is fixedly connected to the top surface of the second sealing plate, and an elastic element is slidably installed on the outer wall of the second fixing rod, the two ends of the elastic element being fixedly connected to the bottom surface of the fixing frame and the top surface of the second sealing plate.

[0010] Preferably, a connecting column is fixedly installed on the bottom surface of the sealing plate, and a hinge block is fixedly installed on the outer wall of the connecting column. The inner wall of the hinge block is hinged to the side of the roller, and the outer wall of the roller is in rolling connection with the inner wall of the connecting shell.

[0011] Preferably, the top surface of the scraper is slidably connected to the bottom surface of the filter plate, and a fan blade is fixedly installed on the outer wall of the upper end of the connecting shaft.

[0012] Preferably, the inner wall of the connecting shell has a discharge port, and the outer wall of the connecting shell has a fixed pipe, one end of which is connected to a cover plate, and the fixed pipe is connected to the discharge port.

[0013] Preferably, a movable column is slidably installed through the top surface of the fixed block, the lower end of the movable column is fixedly connected to the outer wall of the striking head, a circular plate is fixedly installed at the upper end of the movable column, and an elastic element three is slidably installed on the outer wall of the movable column, with both ends of the elastic element three being fixedly connected to the bottom surface of the circular plate and the top surface of the fixed block.

[0014] Preferably, a fixing strip is fixedly installed on the outer wall of the upper end of the connecting shaft, and an inclined strip is fixedly installed on one end of the fixing strip, with the bottom surface of the inclined strip slidingly connected to the top surface of the circular plate.

[0015] Compared with the prior art, the beneficial effects of the present invention are: When the present invention draws water from the foundation pit through the connecting shell, the water flows into the connecting shell and is filtered by the filter plate, which filters the soil below the filter plate. At the same time, the water flow drives the fan blade to rotate, which drives the connecting shaft and scraper to rotate. The scraper scrapes the soil at the bottom of the filter plate. During the rotation of the scraper, the soil in the water flow is centrifugally dispersed to the edge. The heavier soil is scraped off and falls into the fixed pipe, so that the soil will not clog the filter plate and the connecting shell, thereby improving the efficiency of foundation pit drainage. When the fan blades and connecting shaft rotate, they drive the fixed strip and the inclined strip to rotate. During the rotation of the inclined strip, when the inclined surface of the inclined strip contacts and squeezes the circular plate, it pushes the circular plate, the moving column and the striking head to move downward. When the inclined strip moves away from the circular plate, the elastic element pushes the circular plate, the moving column and the striking head to move upward, so that the striking head moves up and down and strikes and vibrates the filter plate, shaking the soil on the filter plate off, making it less likely to clog the filter plate and further improving the drainage efficiency. During the drainage process, the connecting column, hinge block, and rollers limit the movement of the connecting column and the second sealing plate, making the movement of the second sealing plate more stable. When the second sealing plate and the rollers move downward, the rollers squeeze the circular plate, and the circular plate drives the moving column and the striking head to move downward to strike and vibrate the filter plate, further shaking off the soil below the filter plate. At this time, the third elastic element is squeezed, which buffers the circular plate and the rollers, and further buffers the second sealing plate. When the second sealing plate moves downward to seal, the second sealing plate is not easily damaged by large impacts, thus improving its service life. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic cross-sectional view of the three-dimensional structure of the fixed shell of the present invention; Figure 3 This is an exploded view of the three-dimensional structure of the connecting arm of the present invention; Figure 4 This is a schematic cross-sectional view of the three-dimensional structure of the connecting shell of the present invention; Figure 5 For the present invention Figure 4 Enlarged view of point A in the middle; Figure 6 This is a schematic diagram of the three-dimensional structure of the scraper of the present invention; Figure 7 This is a schematic diagram of the three-dimensional structure of the fan blade of the present invention; Figure 8 This is a schematic diagram of the oblique strip three-dimensional structure of the present invention; Figure 9 This is a schematic cross-sectional view of the top three-dimensional structure of the connecting shell of the present invention.

[0017] In the picture: 1. Vehicle body; 101. Motor; 102. Fixing shell; 103. Suction shell; 104. Connecting shell; 105. Liquid inlet; 106. Liquid outlet; 2. Drainage Mechanism; 201. Pulley 1; 202. Rotating Shaft; 203. Pulley 2; 204. Turntable 1; 205. Turntable 2; 206. Fixed Column; 207. Connecting Arm; 208. Plunger; 209. Sealing Ring; 210. Sealing Cap; 211. Fixed Rod 1; 212. Sealing Plate 1; 213. Elastic Element 1; 214. Fixed Frame; 215. Fixed Rod 2; 216. Sealing Plate 2; 217. Elastic Element 2; 218. Connecting Column; 219. Hinge Block; 220. Roller; 3. Filtration mechanism; 301. Filter plate; 302. Connecting shaft; 303. Scraper; 304. Fan blade; 305. Discharge port; 306. Fixed pipe; 307. Cover plate; 4. Striking mechanism; 401. Fixed block; 402. Moving column; 403. Striking head; 404. Circular plate; 405. Elastic element three; 406. Fixed strip; 407. Diagonal strip. Detailed Implementation

[0018] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0020] like Figures 1-9 As shown, this application provides a foundation pit drainage pump structure, including: a vehicle body 1, a motor 101 and a fixed housing 102 mounted on the top surface of the vehicle body 1, a suction housing 103 mounted on one end of the fixed housing 102, a connecting housing 104 mounted on one end of the suction housing 103, an outlet 106 provided on the side of the connecting housing 104, and an inlet 105 provided at the lower end of the connecting housing 104, and further including: Drainage mechanism 2 is located above vehicle body 1. Drainage mechanism 2 includes a plunger 208 that is slidably installed on the inner wall of suction shell 103. A fixing frame 214 is fixedly installed on the inner wall of connecting shell 104. A sealing plate 216 is provided below the fixing frame 214. A roller 220 is provided below the sealing plate 216. Specifically, such as Figures 1-9As shown, a pulley 201 is fixedly installed on the outer wall of the output rod of motor 101. A rotating shaft 202 is rotatably installed on the side of the fixed housing 102 through a bearing. A pulley 203 is fixedly installed on the outer wall of one end of the rotating shaft 202. The pulley 203 is connected to the pulley 201 through a belt.

[0021] In this embodiment: the motor 101 is an energy-saving motor. The motor 101 can drive pulley 201 to rotate. The pulley 201 drives pulley 203 and shaft 202 to rotate via belt.

[0022] Specifically, such as Figures 1-9 As shown, a turntable 204 is fixedly installed on the outer wall of one end of the rotating shaft 202. A turntable 205 is fixedly connected to the side edge of the turntable 204 via a fixing post 206. A connecting arm 207 is rotatably installed on the outer wall of the fixing post 206. The other end of the connecting arm 207 is hinged to one end of the plunger 208.

[0023] In this embodiment: when the turntable 204 rotates, it drives the fixed column 206 to rotate, the fixed column 206 drives the connecting arm 207 to move, and the connecting arm 207 drives the plunger 208 to reciprocate.

[0024] Specifically, such as Figures 1-9 As shown, a sealing ring 209 is fixedly installed on the inner wall of the suction shell 103. The inner wall of the sealing ring 209 is slidably connected to the outer wall of the plunger 208. A sealing cap 210 is installed on the top of the connecting shell 104. A fixing rod 211 is slidably installed on the inner wall of the sealing cap 210. A sealing plate 212 is fixedly installed at the lower end of the fixing rod 211. An elastic element 213 is slidably installed on the outer wall of the fixing rod 211. Both ends of the elastic element 213 are fixedly connected to the bottom surface of the sealing cap 210 and the top surface of the sealing plate 212.

[0025] In this embodiment: the sealing cap 210 seals the connecting shell 104 and limits the fixing rod 211, making the movement of the fixing rod 211 and the sealing plate 212 more stable, and the elastic element 213 applies elastic force to the sealing plate 212.

[0026] Specifically, such as Figures 1-9 As shown, a second fixing rod 215 is slidably installed on the inner wall of the fixing frame 214. The lower end of the second fixing rod 215 is fixedly connected to the top surface of the second sealing plate 216. An elastic element 217 is slidably installed on the outer wall of the second fixing rod 215. Both ends of the elastic element 217 are fixedly connected to the bottom surface of the fixing frame 214 and the top surface of the second sealing plate 216.

[0027] In this embodiment: the elastic element 217 applies elastic force to the sealing plate 216, and the fixing frame 214 limits the fixing rod 215, so that the fixing rod 215 and the sealing plate 216 move more stably.

[0028] Specifically, such as Figures 1-9 As shown, a connecting column 218 is fixedly installed on the bottom surface of the sealing plate 216, and a hinge block 219 is fixedly installed on the outer wall of the connecting column 218. The inner wall of the hinge block 219 is hinged to the side of the roller 220, and the outer wall of the roller 220 is in rolling connection with the inner wall of the connecting shell 104.

[0029] In this embodiment, the connecting column 218 and the sealing plate 216 are limited by the hinge block 219 and the roller 220, so that the sealing plate 216 moves more stably.

[0030] The filter mechanism 3 is located above the vehicle body 1. A filter plate 301 is fixedly installed on the inner wall of the connecting shell 104. A connecting shaft 302 is rotatably installed on the inner wall of the filter plate 301 through a bearing. A scraper 303 is fixedly installed on the outer wall of the lower end of the connecting shaft 302. Specifically, such as Figures 1-9 As shown, the top surface of the scraper 303 is slidably connected to the bottom surface of the filter plate 301, and the fan blade 304 is fixedly installed on the outer wall of the upper end of the connecting shaft 302.

[0031] In this embodiment: the filter plate 301 is used to filter the mud in the water. When the water flow impacts the fan blade 304, the fan blade 304 rotates, which drives the connecting shaft 302 and the scraper 303 to rotate, scraping the inside of the bottom surface of the filter plate 301.

[0032] Specifically, such as Figures 1-9 As shown, the inner wall of the connecting shell 104 is provided with a discharge port 305, and a fixing pipe 306 is fixedly installed on the outer wall of the connecting shell 104. One end of the fixing pipe 306 is connected to a cover plate 307, and the fixing pipe 306 is connected to the discharge port 305.

[0033] In this embodiment: the fixed tube 306 and the cover plate 307 are provided so that the scraped interior can be collected in the fixed tube 306, and the cover plate 307 can be removed to remove the soil.

[0034] The striking mechanism 4 is located above the vehicle body 1. The striking mechanism 4 includes a fixing block 401 fixedly installed on the inner wall of the connecting shell 104, and a striking head 403 is provided below the fixing block 401.

[0035] Specifically, such as Figures 1-9 As shown, a movable column 402 is slidably installed through the top surface of the fixed block 401. The lower end of the movable column 402 is fixedly connected to the outer wall of the striking head 403. A circular plate 404 is fixedly installed on the upper end of the movable column 402. An elastic element 405 is slidably installed on the outer wall of the movable column 402. Both ends of the elastic element 405 are fixedly connected to the bottom surface of the circular plate 404 and the top surface of the fixed block 401.

[0036] In this embodiment: the elastic element 405 applies elastic force to the circular plate 404, and the striking head 403 can strike and vibrate the filter plate 301, causing the interior of the bottom of the filter plate 301 to fall.

[0037] Specifically, such as Figures 1-9 As shown, a fixing strip 406 is fixedly installed on the outer wall of the upper end of the connecting shaft 302, and an inclined strip 407 is fixedly installed on one end of the fixing strip 406. The bottom surface of the inclined strip 407 is slidably connected to the top surface of the circular plate 404.

[0038] In this embodiment: the bottom and top of the inclined strip 407 are both set as inclined surfaces. The inclined surface at the bottom of the inclined strip 407 pushes the circular plate 404 to move downward, which drives the striking head 403 to strike the filter plate 301. When the inclined surface at the top of the inclined strip 407 is squeezed by the roller 220, the roller 220 will push the inclined strip 407 to move, and the inclined strip 407 will not block the roller 220 from moving downward.

[0039] The specific solution is as follows: Inlet 105 is connected to the pit water via a pipe, and outlet 106 extends to the outside of the pit via a pipe. Motor 101 is activated, driving pulley 201 to rotate. Pulley 201, via a belt, drives pulley 203 and shaft 202 to rotate. Shaft 202 drives turntable 204 and fixed column 206 to rotate, causing connecting arm 207 and plunger 208 to reciprocate. When plunger 208 moves towards turntable 204, a vacuum is created inside suction shell 103. Water from the pit flows from inlet 105, squeezing sealing plate 216 upwards and pressing elastic element 217. The water then flows into connecting shell 104 and suction... In the shell 103, when water flows into the connecting shell 104, it is filtered by the filter plate 301, trapping the mud below the filter plate 301. Simultaneously, the water flow drives the fan blade 304 to rotate, which in turn drives the connecting shaft 302 and the scraper 303 to rotate. The scraper 303 scrapes away the mud at the bottom of the filter plate 301. During the rotation of the scraper 303, the mud in the water flow is centrifugally dispersed towards the edges, and the heavier mud falls into the fixed pipe 306, preventing mud from clogging the filter plate 301 and the connecting shell 104, thus improving the efficiency of the foundation pit drainage. At the same time, the connecting shaft 302 drives the fixed strip 406 and the inclined strip 407 to rotate, and the inclined strip... During the rotation of bar 407, when the inclined surface of bar 407 contacts and presses against circular plate 404, it pushes circular plate 404, moving column 402, and striking head 403 downward. When bar 407 moves away from circular plate 404, elastic element 3 405 pushes circular plate 404, moving column 402, and striking head 403 upward, causing striking head 403 to move up and down reciprocally and strike and vibrate filter plate 301, shaking off the dirt on filter plate 301 and preventing clogging. When plunger 208 moves away from turntable 1 204, plunger 208 pushes the liquid in suction shell 103 and connecting shell 104, and elastic element 217 pushes sealing plate 2. The 16 inlet ports 105 are blocked and sealed. The sealing plate 216 and roller 220 move downward. The roller 220 squeezes the circular plate 404. The circular plate 404 drives the moving column 402 and the knocking head 403 to move downward to knock and vibrate the filter plate 301, further shaking off the soil below the filter plate 301. At this time, the elastic element 3 405 is squeezed, which buffers the circular plate 404 and roller 220, and further buffers the sealing plate 216. When the sealing plate 216 moves downward to seal, the sealing plate 216 is not easily damaged by large impacts, thus improving its service life. The water flow pushes the sealing plate 212 upward, and the water flows out from the outlet 106.

[0040] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary; within the framework of this invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.

[0041] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A foundation pit drainage pump structure, comprising: The vehicle body (1) has a motor (101) and a fixed shell (102) mounted on its top surface. A suction shell (103) is mounted at one end of the fixed shell (102), and a connecting shell (104) is mounted at one end of the suction shell (103). An outlet (106) is provided on the side of the connecting shell (104), and an inlet (105) is provided at the lower end of the connecting shell (104). The vehicle body (1) is characterized by further comprising: A drainage mechanism (2) is provided above the vehicle body (1). The drainage mechanism (2) includes a plunger (208) that is slidably installed on the inner wall of the suction shell (103). A fixing frame (214) is fixedly installed on the inner wall of the connecting shell (104). A sealing plate (216) is provided below the fixing frame (214). A roller (220) is provided below the sealing plate (216). The filter mechanism (3) is located above the vehicle body (1). A filter plate (301) is fixedly installed on the inner wall of the connecting shell (104). A connecting shaft (302) is rotatably installed on the inner wall of the filter plate (301) through a bearing. A scraper (303) is fixedly installed on the outer wall of the lower end of the connecting shaft (302). A striking mechanism (4) is provided above the vehicle body (1). The striking mechanism (4) includes a fixing block (401) fixedly installed on the inner wall of the connecting shell (104). A striking head (403) is provided below the fixing block (401).

2. The foundation pit drainage pump structure according to claim 1, characterized in that, A pulley (201) is fixedly installed on the outer wall of the output rod of the motor (101). A rotating shaft (202) is installed through the side of the fixed shell (102) via a bearing. A pulley (203) is fixedly installed on the outer wall of one end of the rotating shaft (202). The pulley (203) is connected to the pulley (201) via a belt.

3. The foundation pit drainage pump structure according to claim 2, characterized in that, A turntable one (204) is fixedly installed on the outer wall of one end of the rotating shaft (202). A turntable two (205) is fixedly connected to the side edge of the turntable one (204) through a fixed post (206). A connecting arm (207) is rotatably installed on the outer wall of the fixed post (206). The other end of the connecting arm (207) is hinged to one end of the plunger (208).

4. The foundation pit drainage pump structure according to claim 3, characterized in that, A sealing ring (209) is fixedly installed on the inner wall of the suction shell (103). The inner wall of the sealing ring (209) is slidably connected to the outer wall of the plunger (208). A sealing cap (210) is installed on the top of the connecting shell (104). A fixing rod (211) is slidably installed on the inner wall of the sealing cap (210). A sealing plate (212) is fixedly installed at the lower end of the fixing rod (211). An elastic element (213) is slidably installed on the outer wall of the fixing rod (211). Both ends of the elastic element (213) are fixedly connected to the bottom surface of the sealing cap (210) and the top surface of the sealing plate (212).

5. The foundation pit drainage pump structure according to claim 4, characterized in that, The inner wall of the fixed frame (214) is slidably installed with a second fixed rod (215). The lower end of the second fixed rod (215) is fixedly connected to the top surface of the second sealing plate (216). The outer wall of the second fixed rod (215) is slidably installed with an elastic element (217). The two ends of the elastic element (217) are fixedly connected to the bottom surface of the fixed frame (214) and the top surface of the second sealing plate (216).

6. The foundation pit drainage pump structure according to claim 5, characterized in that, A connecting column (218) is fixedly installed on the bottom surface of the sealing plate (216). A hinge block (219) is fixedly installed on the outer wall of the connecting column (218). The inner wall of the hinge block (219) is hinged to the side of the roller (220). The outer wall of the roller (220) is rolledly connected to the inner wall of the connecting shell (104).

7. The foundation pit drainage pump structure according to claim 1, characterized in that, The top surface of the scraper (303) is slidably connected to the bottom surface of the filter plate (301), and a fan blade (304) is fixedly installed on the outer wall of the upper end of the connecting shaft (302).

8. The foundation pit drainage pump structure according to claim 7, characterized in that, The inner wall of the connecting shell (104) is provided with a discharge port (305), and a fixing pipe (306) is fixedly installed on the outer wall of the connecting shell (104). One end of the fixing pipe (306) is connected to a cover plate (307), and the fixing pipe (306) is connected to the discharge port (305).

9. The foundation pit drainage pump structure according to claim 1, characterized in that, A movable column (402) is slidably installed through the top surface of the fixed block (401). The lower end of the movable column (402) is fixedly connected to the outer wall of the striking head (403). A circular plate (404) is fixedly installed at the upper end of the movable column (402). An elastic element three (405) is slidably installed on the outer wall of the movable column (402). Both ends of the elastic element three (405) are fixedly connected to the bottom surface of the circular plate (404) and the top surface of the fixed block (401).

10. The foundation pit drainage pump structure according to claim 9, characterized in that, A fixing strip (406) is fixedly installed on the outer wall of the upper end of the connecting shaft (302), and a diagonal strip (407) is fixedly installed on one end of the fixing strip (406). The bottom surface of the diagonal strip (407) is slidably connected to the top surface of the circular plate (404).

Images