Compact pollution density index automatic measuring instrument

Abstract

The invention relates to the technical field of water quality monitoring, and discloses a compact pollution density index automatic measuring instrument, which comprises a box body, a substrate fixedly installed in the box body, a membrane box fixedly installed on the substrate, and a filter membrane arranged in the membrane box: a membrane replacement assembly used for automatically replacing the filter membrane; the turbulent flow assembly is used for disturbing the water sample in the diaphragm capsule; and the film changing assembly comprises a driving shaft and a driven shaft. Through the arrangement of the membrane changing assembly, after the sludge density index is measured every time, the motor can be started to automatically change the membrane, so that a new filter membrane can be used for measurement every time, and the accuracy of a measurement result is ensured; and through the arrangement of the counter, a worker can observe the number of times of automatic membrane replacement of the filter membrane and is reminded to replace the whole filter membrane in time.

Description

Technical Field

[0001] The present invention relates to the technical field of water quality monitoring, and in particular to a compact pollution density index automatic measuring instrument. Background Art

[0002] The pollution density index automatic measuring instrument is a device that evaluates the degree of membrane pollution caused by suspended particulate matter in water bodies through automated means. It is used to measure the silt density index. The measurement principle of the silt density index is to filter sewage with a microporous filter membrane under constant pressure. By comparing the initial filtration time of a certain amount of water and the time of filtering a certain amount of water again after continuous filtration for a certain period of time, the filtration time increment caused by the blockage of the membrane by suspended particulate matter is calculated, and then the membrane pollution rate is quantified. The higher the value, the more serious the suspended particulate pollution in the water body. It is often used to evaluate the inlet water quality of the membrane treatment system.

[0003] However, the existing technology has the following problems: Although the existing measuring instruments have a backwash function, after the filter membrane is used, a certain amount of impurities will always adhere to its surface. As the number of times the filter membrane is used increases, the attached impurities will also increase, causing a certain error in the result of each measurement due to the impurities attached to the filter membrane itself. When measuring water samples with more serious pollution for a long time, the filter membrane needs to be frequently replaced manually. The manual replacement operation is relatively time-consuming, which has a certain impact on the efficiency of the measurement operation. Summary of the Invention

[0004] The purpose of the present invention is to provide a compact automatic pollution density index measuring instrument in order to solve the above problems, in order to overcome the defect of the prior art that after use, the filter membrane will always have certain impurities attached to its surface. As the number of times the filter membrane is used increases, the attached impurities will also increase, so that the results of each measurement will cause certain errors due to the impurities attached to the filter membrane itself. See the following for details.

[0005] To achieve the above objectives, the present invention provides the following technical solutions: The present invention provides a compact pollution density index automatic measuring instrument, comprising: a box body, a base plate fixedly installed inside the box body, a membrane box fixedly installed on the base plate, a filter membrane provided inside the membrane box, a water sample box and a flushing box fixedly installed in the box body, a water sample tube fixedly installed on the water sample box, a flushing tube fixedly installed on the flushing box, and a water outlet pipe fixedly connected to the membrane box: a membrane changing assembly for automatically replacing the filter membrane; a spoiler assembly for disturbing the water sample in the membrane box; the membrane changing assembly comprises a driving shaft and a driven shaft, a first layer and a second layer are fixedly connected inside the membrane box, the driving shaft and the driven shaft are both rotatably installed in the membrane box, two ends of the filter membrane are fixedly wound on the driving shaft and the driven shaft respectively, the filter membrane passes through the first layer and the second layer, a motor is installed on the membrane box, the output end of the motor is transmission-connected to the driving shaft, and a counter is fixedly installed on the outer wall of the membrane box.

[0006] Preferably, the driving shaft is located above the first layer of plate, and the driven shaft is located below the second layer of plate. The contact parts of the first and second layers with the filter membrane are both provided with sealing strips. A flow guide cover is fixedly installed inside the membrane box, and the end of the water sample tube away from the water sample box is fixedly connected to the flow guide cover. Two pressure strips are fixedly installed inside the membrane box, and the two pressure strips are respectively in sliding contact with two edges of the filter membrane. A test cavity is formed between the first layer of plate, the second layer of plate, the flow guide cover and the filter membrane, and a clean water cavity is formed between the first layer of plate, the second layer of plate, the side of the filter membrane away from the flow guide cover and the membrane box. The water outlet pipe runs through the box body, and the connection between the water outlet pipe and the membrane box is located on the side of the filter membrane away from the flow guide cover. The end of the flushing pipe away from the flushing box is connected to the membrane box, and the connection between the flushing pipe and the membrane box is located on the side of the filter membrane close to the flow guide cover.

[0007] Preferably, two measuring wheels are rotatably mounted on the first plate, and the two measuring wheels are respectively in contact with both sides of the filter membrane. A short shaft is fixedly connected to one of the measuring wheels, and the short shaft passes through the membrane box. A pointer shaft is rotatably mounted on the outer wall of the membrane box, and the short shaft and the pointer shaft are connected by a belt drive. A paddle is mounted on the counter, and a pointer is provided on the pointer shaft, and the pointer contacts the paddle during rotation.

[0008] Preferably, the counter is electrically connected to the motor via a wire, and a replacement indicator light is provided on the counter.

[0009] Preferably, the membrane changing assembly also includes a tensioning part, which includes a sliding rod, which is horizontally slidably installed in the membrane box, and the sliding rod is located below the second layer. A protrusion is fixedly connected to the sliding rod, and a light rod is slidingly connected through the second layer. The two ends of the light rod are respectively fixedly connected with a float and a cone block, and the float is located above the second layer. The cone block contacts the protrusion during movement, and the outer wall of the driven shaft is fixedly connected with a ratchet. Ratchet teeth are provided on the sliding rod, and the ratchet teeth engage with the ratchet during movement. A reset spring is provided between the sliding rod and the membrane box.

[0010] Preferably, a gravity rod is slidably mounted inside the membrane box, and two pressure wheels are rotatably mounted on the gravity rod, and both of the pressure wheels are in contact with the filter membrane wound on the driven shaft.

[0011] Preferably, the spoiler assembly includes a rotating shaft, which is rotatably mounted on the second layer, a water wheel is rotatably mounted on one end of the rotating shaft, an annular inclined groove is provided at the other end of the rotating shaft, the water wheel is located in the water sample tube, and a plurality of first blades are fixedly connected to the outer wall of the rotating shaft.

[0012] Preferably, a slide is slidably mounted on the second plate, a ball ring is fixedly connected to the slide, the ball ring is sleeved on the rotating shaft, a ball is provided on the inner wall of the ball ring, the ball is slidably connected to the annular inclined groove, a shift rod is fixedly connected to the slide, two columns are rotatably mounted on the second plate, a cam is fixedly connected to the bottom of the column, slide grooves are respectively provided at both ends of the shift rod, a pin is provided on the cam, the two pins of the cams are respectively slidably connected to the two slide grooves of the shift rod, and a plurality of second blades are fixedly connected to the outer wall of the column.

[0013] Preferably, two nozzles are rotatably mounted on the second plate, and both of the nozzles are rotatably connected to the flushing pipe. A first cam is fixedly connected to the cam, and a second cam is fixedly connected to the outer wall of the nozzle. Two rotating rods are rotatably mounted on the second plate, and sliding grooves are respectively provided at both ends of the rotating rods. Pins are respectively provided on the first and second cams, and the pins of the two first cams are respectively slidably connected to one of the sliding grooves of the two rotating rods, and the pins of the two second cams are respectively slidably connected to the other sliding groove of the two rotating rods.

[0014] The beneficial effects are: 1. This compact pollution density index automatic measuring instrument is equipped with a membrane replacement component. After each silt density index measurement is completed, the motor can start to automatically replace the membrane, so that a new filter membrane can be used for each measurement, thereby ensuring the accuracy of the measurement results. The setting of the counter allows staff to observe the number of automatic membrane replacements and reminds staff to replace the entire filter membrane in time.

[0015] 2. This compact pollution density index automatic measuring instrument, through the setting of the tensioning part, enables the ratchet to lock the ratchet wheel during the measurement process, thereby fixing the driven shaft, thereby maintaining the tension of the filter membrane and preventing the filter membrane from becoming loose due to water pressure. The two pressure wheels of the gravity rod always press the filter membrane wound on the driven shaft to prevent the driven shaft from loosening when winding.

[0016] 3. This compact pollution density index automatic measuring instrument, through the setting of the spoiler component, enables multiple first blades to stir the water sample in the test chamber, so that impurities are more evenly distributed in the water, avoiding the deposition of some impurities. Multiple second blades can stir the water flow beside the filter membrane through reciprocating swing, so that impurities attached to the filter membrane are more evenly distributed, avoiding uneven distribution of impurities on the filter membrane surface and affecting the accuracy of the water flow time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 It is a schematic diagram of the appearance of the present invention; Figure 2 It is a schematic diagram of the overall structure of the present invention; Figure 3 It is a schematic diagram of the membrane box structure of the present invention; Figure 4 It is a schematic structural diagram of the membrane replacement assembly of the present invention; Figure 5 It is a schematic diagram of the filter membrane structure of the present invention; Figure 6 It is a schematic structural diagram of a counter of the present invention; Figure 7 It is a schematic structural diagram of the tensioning portion of the present invention; Figure 8 1 is a schematic structural diagram of a spoiler assembly according to the present invention; Figure 9 It is a schematic diagram of the rotating shaft structure of the present invention; Figure 10 It is a schematic diagram of the structure of the carriage of the present invention; Figure 11 It is a schematic diagram of the nozzle structure of the present invention; Figure 12 It is a schematic diagram of the rotating rod structure of the present invention.

[0019] The accompanying drawings are described as follows: 1. housing; 2. base plate; 3. membrane box; 31. first layer; 32. second layer; 33. pressure strip; 4. membrane changing assembly; 41. driving shaft; 42. driven shaft; 43. filter membrane; 44. motor; 45. measuring wheel; 46. short shaft; 47. pointer shaft; 48. counter; 49. paddle; 5. tensioning part; 51. sliding rod; 52. protrusion; 53. polished rod; 54. float; 55. cone block; 56. ratchet; 57 , gravity rod; 58, pressure wheel; 6, spoiler assembly; 61, rotating shaft; 62, water wheel; 63, first blade; 64, slide; 65, ball ring; 66, annular bevel; 67, shift lever; 68, column; 69, cam; 610, second blade; 611, first protruding rod; 612, rotating rod; 613, second protruding rod; 7, water sample box; 71, water sample tube; 72, deflector; 8, flushing box; 81, flushing tube; 82, nozzle; 9, outlet pipe. DETAILED DESCRIPTION

[0020] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other implementations obtained by ordinary technicians in this field without making any creative work are within the scope of protection of the present invention.

[0021] Example 1 See also Figure 1 - Figure 5 , a compact pollution density index automatic measuring instrument, comprising: a box body 1, a base plate 2 is fixedly installed inside the box body 1, a membrane box 3 is fixedly installed on the base plate 2, a filter membrane 43 is arranged inside the membrane box 3, a water sample box 7 and a flushing box 8 are fixedly installed inside the box body 1, a water sample tube 71 is fixedly installed on the water sample box 7, a flushing tube 81 is fixedly installed on the flushing box 8, and a water outlet pipe 9 is fixedly connected to the membrane box 3: a membrane replacement assembly 4 for automatically replacing the filter membrane 43; the membrane replacement assembly 4 includes a driving shaft 41 and a driven shaft 42, a first layer plate 31 and a second layer plate 32 are fixedly connected to the inside of the membrane box 3, and the driving shaft 41 and the driven shaft 42 are both The filter membrane 43 is rotatably installed in the membrane box 3, and the two ends of the filter membrane 43 are fixedly wound on the driving shaft 41 and the driven shaft 42 respectively. The filter membrane 43 passes through the first layer 31 and the second layer 32. A motor 44 is installed on the membrane box 3, and the output end of the motor 44 is transmission-connected to the driving shaft 41. A counter 48 is fixedly installed on the outer wall of the membrane box 3. When the motor 44 is started, the motor 44 drives the driving shaft 41 to rotate, and the driving shaft 41 reels the filter membrane 43. When the filter membrane 43 is reeled in, it drives the driven shaft 42 to rotate, and the unused filter membrane 43 on the driven shaft 42 is reeled onto the driving shaft 41 by reeling in the driving shaft 41, thereby achieving the effect of automatic membrane replacement.

[0022] For further information, see Figure 3 - Figure 5 The driving shaft 41 is located above the first layer plate 31, and the driven shaft 42 is located below the second layer plate 32. The contact parts of the first layer plate 31 and the second layer plate 32 with the filter membrane 43 are both provided with sealing strips. A flow guide cover 72 is fixedly installed inside the membrane box 3, and the end of the water sample tube 71 away from the water sample box 7 is fixedly connected to the flow guide cover 72. Two pressure strips 33 are fixedly installed inside the membrane box 3. The two pressure strips 33 are in sliding contact with two edges of the filter membrane 43 respectively. The two pressure strips 33 press the two edges of the filter membrane 43 to prevent the filter membrane 43 from wrinkling. A test cavity is formed between the first layer plate 31, the second layer plate 32, the flow guide cover 72 and the filter membrane 43, and a clean water cavity (such as Figure 5 As shown in FIG1 , a pressure sensor is provided in the test chamber, a liquid level sensor and a timer are provided in the clean water chamber, a water outlet pipe 9 runs through the box body 1, and the connection between the water outlet pipe 9 and the membrane box 3 is located on the side of the filter membrane 43 away from the flow guide cover 72, and the end of the flushing pipe 81 away from the flushing box 8 is connected to the membrane box 3, and the connection between the flushing pipe 81 and the membrane box 3 is located on the side of the filter membrane 43 close to the flow guide cover 72 (as shown in FIG1 ). Figure 8 As shown in FIG, a control panel, a water inlet pump group, a flushing pump group and an exhaust device are provided on the box body 1. The exhaust device is used to exhaust the gas in the test chamber during measurement. The pressure sensor controls the power of the water inlet pump group to keep the water pressure in the test chamber at a set value. The liquid level sensor measures the volume of clean water in the clean water chamber. When the clean water reaches the set volume, the timer transmits the data to the control panel, and the silt density index data is calculated by the control panel. After one measurement is completed, the water in the clean water chamber is emptied through the outlet pipe 9.

[0023] Further, see Figure 5 - Figure 6 Two measuring wheels 45 are rotatably installed on the first layer 31, and the two measuring wheels 45 are respectively abutted against the two sides of the filter membrane 43. A short shaft 46 is fixedly connected to one of the measuring wheels 45, and the short shaft 46 passes through the membrane box 3. A pointer shaft 47 is rotatably installed on the outer wall of the membrane box 3. The short shaft 46 and the pointer shaft 47 are connected by a belt transmission. A paddle 49 is installed on the counter 48, and a pointer is provided on the pointer shaft 47. During the rotation of the pointer, it contacts the paddle 49. The two measuring wheels 45 are made of elastic material and have a large friction force with the filter membrane 43. When the filter membrane 43 is wound, the two measuring wheels 45 are driven to rotate, and the short shaft 46 drives the pointer shaft 47 to rotate through the belt. When the pointer shaft 47 rotates one circle, the filter membrane 43 is replaced. When the pointer on the pointer shaft 47 is about to rotate one circle, it contacts the paddle 49 and toggles the paddle 49. The paddle 49 drives the counter 48 to count, and the staff can observe the current number of membrane changes through the counter 48.

[0024] For further information, see Figure 6 The counter 48 is electrically connected to the motor 44 through a wire. A replacement indicator light is provided on the counter 48. When the counter 48 is started, the wire is used to control the motor 44 to shut down, thereby stopping the membrane replacement. When the number on the counter 48 reaches a limit value, it means that the filter membrane 43 on the driven shaft 42 is exhausted. At this time, the replacement indicator light is on, and the staff needs to replace the entire filter membrane 43.

[0025] Also, see Figure 5 、 Figure 7 The membrane changing assembly 4 also includes a tensioning portion 5, which includes a slide rod 51. The slide rod 51 is horizontally slidably installed in the membrane box 3. The slide rod 51 is located below the second layer 32. A protrusion 52 is fixedly connected to the slide rod 51. A light rod 53 is slidably connected to the second layer 32. Both ends of the light rod 53 are fixedly connected to a float 54 and a cone block 55. The float 54 is located above the second layer 32. The cone block 55 contacts the protrusion 52 during movement. The outer wall of the driven shaft 42 is fixedly connected to a ratchet 56. A slide rod 51 is provided There are ratchets, which engage with the ratchet 56 during movement. A return spring is provided between the slide rod 51 and the membrane box 3. After water enters the clean water chamber, the float 54 floats up and drives the light rod 53 to move up. When moving up, the cone block 55 contacts the protrusion 52 and drives the slide rod 51 to move toward the ratchet 56, so that the ratchet on the slide rod 51 engages with the ratchet 56, and the ratchet locks the ratchet 56. At this time, the ratchet 56 and the driven shaft 42 cannot rotate, thereby keeping the filter membrane 43 in a tensioned state and preventing the filter membrane 43 from becoming loose due to water pressure.

[0026] In addition, see Figure 7 A gravity rod 57 is slidably installed inside the membrane box 3, and two pressure wheels 58 are rotatably installed on the gravity rod 57. The two pressure wheels 58 are in contact with the filter membrane 43 wound on the driven shaft 42. The gravity rod 57 falls down due to gravity, so that the two pressure wheels 58 always press the filter membrane 43 wound on the driven shaft 42, preventing the driven shaft 42 from loosening during winding, while keeping the filter membrane 43 in a tensioned state.

[0027] It is worth noting that see Figure 3 、 Figure 8 - Figure 10 , the spoiler assembly 6 is used to disturb the water sample in the membrane box 3; the spoiler assembly 6 includes a shaft 61, the shaft 61 is rotatably mounted on the second plate 32, one end of the shaft 61 is rotatably mounted with a water wheel 62, the other end of the shaft 61 is provided with an annular chute 66, the water wheel 62 is located in the water sample tube 71 (such as Figure 8As shown in the figure, the outer wall of the rotating shaft 61 is fixedly connected to a plurality of first blades 63. When water enters the water sample tube 71, the water flow in the water sample tube 71 drives the rotating shaft 61 to rotate through the water wheel 62, and the rotating shaft 61 drives the plurality of first blades 63 to rotate. The plurality of first blades 63 stir the water sample in the test chamber to make the impurities more evenly distributed in the water, thereby avoiding the deposition of some impurities.

[0028] It is worth noting that, please refer to Figure 9 - Figure 10 , a slide 64 is slidably mounted on the second layer 32, a ball ring 65 is fixedly connected to the slide 64, the ball ring 65 is sleeved on the rotating shaft 61, a ball is provided on the inner wall of the ball ring 65, and the ball is slidably connected to the annular inclined groove 66, a lever 67 is fixedly connected to the slide 64, and two columns 68 are rotatably mounted on the second layer 32, a cam 69 is fixedly connected to the bottom of the column 68, a slide groove is respectively provided at both ends of the lever 67, a pin is provided on the cam 69, and the pins of the two cams 69 are respectively slidably connected to the two slide grooves of the lever 67 (as shown in FIG. Figure 10 As shown in FIG5 , when the annular inclined groove 66 rotates, the ball ring 65 and the slide 64 are driven to reciprocate through the balls. The outer wall of the column 68 is fixedly connected to a plurality of second blades 610. During the reciprocating motion of the shifting rod 67, the two chutes of the shifting rod 67 cooperate with the pin shaft to drive the two cams 69 to swing back and forth. The two cams 69 respectively drive the two columns 68 to rotate back and forth, and the plurality of second blades 610 on the two columns 68 swing back and forth accordingly. The plurality of second blades 610 are all located beside the filter membrane 43. The reciprocating swing of the plurality of second blades 610 can shift the water flow beside the filter membrane 43, so that the impurities attached to the filter membrane 43 are distributed more evenly, thereby avoiding uneven distribution of impurities on the surface of the filter membrane 43 affecting the accuracy of the water flow time, thereby affecting the accuracy of the silt density index measurement.

[0029] It is worth mentioning that see Figure 10 - Figure 12, two nozzles 82 are rotatably mounted on the second layer 32, and the two nozzles 82 are rotatably connected to the flushing pipe 81. A first convex rod 611 is fixedly connected to the cam 69, and a second convex rod 613 is fixedly connected to the outer wall of the nozzle 82. Two rotating rods 612 are rotatably mounted on the second layer 32, and a slide groove is respectively provided at both ends of the rotating rod 612. A pin is respectively provided on the first convex rod 611 and the second convex rod 613. The pins of the two first convex rods 611 are respectively slidably connected to one of the slide grooves of the two rotating rods 612, and the two second The pin shafts of the protruding rods 613 are respectively slidably connected to the other sliding grooves of the two rotating rods 612. When the two cams 69 swing back and forth, they can drive the two rotating rods 612 to swing back and forth through the pin shafts of the two first protruding rods 611 and the sliding grooves of the two rotating rods 612. The two rotating rods 612 drive the two nozzles 82 to swing back and forth through the two sliding grooves and the pin shafts of the two second protruding rods 613. The reciprocating movement of the two nozzles 82 can expand the flushing range, thereby optimizing the flushing effect and minimizing impurities attached to the surface of the filter membrane 43.

[0030] With the above structure, the working principle of this case is that a control panel, a water inlet pump group, a flushing pump group and an exhaust device are provided on the box 1. The water inlet pump group draws the water sample into the water sample box 7 for buffering. The water sample box 7 transports the water sample to the test cavity of the membrane box 3 through the water sample tube 71. The impurities in the water sample are filtered by the filter membrane 43. The clean water enters the clean water cavity after passing through the filter membrane 43. A pressure sensor is provided in the test cavity. A liquid level sensor and a timer are provided in the clean water cavity. The pressure sensor controls the power of the water inlet pump group to keep the water pressure in the test cavity at a set value. The liquid level sensor measures the clean water volume in the clean water cavity. When the clean water reaches the set volume, the timer transmits the data to the control panel. The silt density index data is obtained through calculation on the control panel. After one measurement is completed, the water in the clean water chamber is drained through the outlet pipe 9, and then the flushing pump group pumps the clean water to the flushing box 8 for buffering, and then transports it to the two nozzles 82 through the flushing pipe 81. The two nozzles 82 backwash the filter membrane 43, the test chamber water sample tube 71 and the water sample box 7 to empty the impurities in the test chamber and the water sample tube 71, so as to avoid residual impurities in the test chamber and contamination of the water sample for the next measurement, thereby affecting the accuracy of the next measurement. Solenoid valves are respectively provided in the water sample tube 71, the flushing pipe 81 and the outlet pipe 9. When no water is flowing, the solenoid valves are closed. After backwashing and drainage of the clean water chamber are completed, one measurement is completed.

[0031] After one measurement is completed, the motor 44 is started, and the motor 44 drives the active shaft 41 to rotate. The active shaft 41 reels the filter membrane 43. The two pressure strips 33 press the two edges of the filter membrane 43 to prevent the filter membrane 43 from wrinkling. When the filter membrane 43 is reeled in, it drives the driven shaft 42 to rotate. The unused filter membrane 43 on the driven shaft 42 is reeled onto the active shaft 41 through the reeling of the active shaft 41, thereby achieving the effect of automatic membrane replacement. The two measuring wheels 45 are made of elastic material and have a large friction force with the filter membrane 43. Therefore, when the filter membrane 43 is reeled in, it drives the two measuring wheels 45 to rotate. The measuring wheel 45 connected to the short shaft 46 drives the short shaft 46 to rotate, and the short shaft 46 drives the pointer shaft 47 to rotate through the belt. Since the length of the filter membrane 43 is fixed each time it is replaced, the number of revolutions of the short shaft 46 is also fixed. When the pointer shaft 47 rotates one circle, the filter membrane 43 is replaced. When the pointer on the pointer shaft 47 is about to rotate one circle, it contacts the paddle 49 and paddles the paddle 49. When the pointer shaft 47 completes one circle, the paddle 49 drives the counter 48 to count. The staff can observe the current number of membrane replacements through the counter 48. When the counter 48 starts, the wire is used to control the motor 44 to turn off, thereby stopping the membrane replacement. When the number on the counter 48 reaches a limit value, it means that the filter membrane 43 on the driven shaft 42 is used up. At this time, the replacement indicator light is on, and the staff needs to replace the entire filter membrane 43.

[0032] The gravity rod 57 falls down due to gravity, so that the two pressure wheels 58 always press the filter membrane 43 wound on the driven shaft 42 to prevent the driven shaft 42 from loosening when winding, and at the same time keep the filter membrane 43 in a tensioned state. When changing the membrane, the water in the clean water chamber is emptied, the polished rod 53 and the float 54 fall down, the ratchet on the slide rod 51 disengages from the ratchet 56, and the driven shaft 42 rotates to drive the ratchet 56 to rotate. When the measurement starts, after water enters the clean water chamber, the float 54 floats up and drives the polished rod 53 to move up. When the cone block 55 at the bottom of the polished rod 53 moves up, it contacts the protrusion 52 and drives The protrusion 52 moves toward the direction close to the ratchet 56, and the protrusion 52 drives the slide bar 51 to move synchronously. After the slide bar 51 moves toward the direction close to the ratchet 56, the ratchet teeth engage with the ratchet 56, so that the ratchet teeth lock the ratchet 56. At this time, the ratchet 56 and the driven shaft 42 cannot rotate, thereby maintaining the tension of the filter membrane 43 and preventing the filter membrane 43 from becoming loose due to the action of water pressure. After the clean water in the clean water chamber is emptied, the cone block 55 moves downward, the cone block 55 disengages from the protrusion 52, and the slide bar 51 is reset by the elastic force of the reset spring, so that the ratchet teeth are disengaged from the ratchet 56.

[0033] When water enters the water sample tube 71, the water flow in the water sample tube 71 drives the rotating shaft 61 to rotate through the water wheel 62, and the rotating shaft 61 drives the multiple first blades 63 to rotate. The multiple first blades 63 stir the water sample in the test chamber, so that the impurities are more evenly distributed in the water, avoiding the deposition of some impurities. The rotating shaft 61 rotates, and the annular chute 66 rotates accordingly. When the annular chute 66 rotates, the ball ring 65 and the slide 64 are driven to reciprocate through the ball. When the slide 64 reciprocates, it drives the lever 67 to reciprocate. During the reciprocating motion, the lever 67 The cooperation between the two slide grooves 67 and the pin shaft drives the two cams 69 to swing back and forth, and the two cams 69 respectively drive the two columns 68 to rotate back and forth, and the multiple second blades 610 on the two columns 68 swing back and forth accordingly. The multiple second blades 610 are all located next to the filter membrane 43. The multiple second blades 610 can move the water flow next to the filter membrane 43 through reciprocating swinging, so that the impurities attached to the filter membrane 43 are more evenly distributed, avoiding uneven distribution of impurities on the surface of the filter membrane 43 and affecting the accuracy of the water flow time, thereby affecting the accuracy of the silt density index measurement.

[0034] When the two cams 69 swing back and forth, they can drive the two rotating rods 612 to swing back and forth through the cooperation between the pin shafts of the two first protruding rods 611 and the slide grooves of the two rotating rods 612. The two rotating rods 612 drive the two nozzles 82 to swing back and forth through the cooperation between the two slide grooves and the pin shafts of the two second protruding rods 613. Since the water in the test chamber is discharged through the water sample tube 71 during backwashing, the rotating shaft 61 can still rotate, and the two nozzles 82 move back and forth, which can expand the flushing range, thereby optimizing the flushing effect, minimizing impurities attached to the surface of the filter membrane 43, and avoiding the increase in the thickness of the filter membrane 43 due to the attachment of more impurities, thereby affecting the winding process.

[0035] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A compact automatic measuring instrument for pollution density index, characterized in that: include: A box body (1) is fixedly mounted with a base plate (2) inside the box body (1), a membrane box (3) is fixedly mounted on the base plate (2), a filter membrane (43) is provided inside the membrane box (3), a water sample box (7) and a flushing box (8) are fixedly mounted inside the box body (1), a water sample tube (71) is fixedly mounted on the water sample box (7), a flushing tube (81) is fixedly mounted on the flushing box (8), and a water outlet pipe (9) is fixedly connected to the membrane box (3): A membrane replacement assembly (4) for automatically replacing the filter membrane (43); A flow disturbance component (6) for disturbing the water sample in the membrane box (3); The membrane replacement assembly (4) includes a driving shaft (41) and a driven shaft (42), the interior of the membrane box (3) is fixedly connected to a first layer plate (31) and a second layer plate (32), the driving shaft (41) and the driven shaft (42) are both rotatably mounted in the membrane box (3), the two ends of the filter membrane (43) are respectively fixedly wound on the driving shaft (41) and the driven shaft (42), the filter membrane (43) passes through the first layer plate (31) and the second layer plate (32), a motor (44) is mounted on the membrane box (3), the output end of the motor (44) is transmission-connected to the driving shaft (41), and a counter (48) is fixedly mounted on the outer wall of the membrane box (3).

2. A compact pollution density index automatic measuring instrument according to claim 1, characterized in that: The driving shaft (41) is located above the first plate (31), and the driven shaft (42) is located below the second plate (32). The contact parts of the first plate (31) and the second plate (32) with the filter membrane (43) are both provided with sealing strips. A flow guide cover (72) is fixedly installed inside the membrane box (3). The end of the water sample tube (71) away from the water sample box (7) is fixedly connected to the flow guide cover (72). Two pressure strips (33) are fixedly installed inside the membrane box (3). The two pressure strips (33) are in sliding contact with two edges of the filter membrane (43) respectively. The first plate (31) and the second plate (32) are in sliding contact with two edges of the filter membrane (43). A test cavity is formed between the layer plate (32), the flow guide cover (72) and the filter membrane (43); a clean water cavity is formed between the first layer plate (31), the second layer plate (32), the side of the filter membrane (43) away from the flow guide cover (72) and the membrane box (3); the water outlet pipe (9) passes through the box body (1); the connection between the water outlet pipe (9) and the membrane box (3) is located on the side of the filter membrane (43) away from the flow guide cover (72); the end of the flushing pipe (81) away from the flushing box (8) is connected to the membrane box (3); the connection between the flushing pipe (81) and the membrane box (3) is located on the side of the filter membrane (43) close to the flow guide cover (72).

3. The compact automatic pollution density index measuring instrument according to claim 2, characterized in that: Two measuring wheels (45) are rotatably mounted on the first layer plate (31), and the two measuring wheels (45) are respectively in contact with both sides of the filter membrane (43). A short shaft (46) is fixedly connected to one of the measuring wheels (45), and the short shaft (46) passes through the membrane box (3). A pointer shaft (47) is rotatably mounted on the outer wall of the membrane box (3), and the short shaft (46) and the pointer shaft (47) are connected via a belt drive. A paddle (49) is mounted on the counter (48), and a pointer is provided on the pointer shaft (47). The pointer contacts the paddle (49) during rotation.

4. The compact pollution density index automatic measuring instrument according to claim 3, characterized in that: The counter (48) is electrically connected to the motor (44) via a wire, and a replacement indicator light is provided on the counter (48).

5. The compact pollution density index automatic measuring instrument according to claim 2, characterized in that: The membrane changing assembly (4) further includes a tensioning portion (5), the tensioning portion (5) including a slide rod (51), the slide rod (51) being horizontally slidably mounted in the membrane box (3), the slide rod (51) being located below the second layer plate (32), a protrusion (52) being fixedly connected to the slide rod (51), a light rod (53) being slidably connected through the second layer plate (32), a float (54) and a cone block (55) being fixedly connected at both ends of the light rod (53), the float (54) being located above the second layer plate (32), the cone block (55) being in contact with the protrusion (52) during movement, a ratchet (56) being fixedly connected to the outer wall of the driven shaft (42), a ratchet being provided on the slide rod (51), and the ratchet being engaged with the ratchet (56) during movement, and a return spring being provided between the slide rod (51) and the membrane box (3).

6. The compact pollution density index automatic measuring instrument according to claim 5, characterized in that: A gravity rod (57) is slidably mounted inside the membrane box (3), and two pressing wheels (58) are rotatably mounted on the gravity rod (57). Both pressing wheels (58) are in contact with the filter membrane (43) wound on the driven shaft (42).

7. The compact pollution density index automatic measuring instrument according to claim 2, characterized in that: The spoiler assembly (6) comprises a rotating shaft (61), the rotating shaft (61) being rotatably mounted on the second layer plate (32), a water wheel (62) being rotatably mounted on one end of the rotating shaft (61), an annular inclined groove (66) being provided at the other end of the rotating shaft (61), the water wheel (62) being located in the water sample tube (71), and a plurality of first blades (63) being fixedly connected to the outer wall of the rotating shaft (61).

8. The compact automatic pollution density index measuring instrument according to claim 7, characterized in that: A slide (64) is slidably mounted on the second layer (32), a ball ring (65) is fixedly connected to the slide (64), the ball ring (65) is sleeved on the rotating shaft (61), a ball is provided on the inner wall of the ball ring (65), and the ball is slidably connected to the annular inclined groove (66), a shifting rod (67) is fixedly connected to the slide (64), two columns (68) are rotatably mounted on the second layer (32), a cam (69) is fixedly connected to the bottom of the column (68), a slide groove is respectively provided at both ends of the shifting rod (67), a pin is provided on the cam (69), the pins of the two cams (69) are respectively slidably connected to the two slide grooves of the shifting rod (67), and a plurality of second blades (610) are fixedly connected to the outer wall of the column (68).

9. The compact automatic pollution density index measuring instrument according to claim 8, characterized in that: Two nozzles (82) are rotatably mounted on the second plate (32), and both of the nozzles (82) are rotatably connected to the flushing pipe (81). A first convex rod (611) is fixedly connected to the cam (69), and a second convex rod (613) is fixedly connected to the outer wall of the nozzle (82). Two rotating rods (612) are rotatably mounted on the second plate (32), and a slide groove is respectively provided at both ends of the rotating rod (612). A pin is respectively provided on the first convex rod (611) and the second convex rod (613). The pins of the two first convex rods (611) are respectively slidably connected to one of the slide grooves of the two rotating rods (612), and the pins of the two second convex rods (613) are respectively slidably connected to the other slide groove of the two rotating rods (612).

Images