A compact automatic measuring instrument for pollution density index

Abstract

The application 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 base plate fixedly arranged in the box body, a membrane box fixedly arranged on the base plate, a filter membrane arranged in the membrane box, a membrane replacing assembly for automatically replacing the filter membrane, and a flow disturbing assembly for disturbing water samples in the membrane box. The membrane replacing assembly comprises a driving shaft and a driven shaft. After each silt density index measurement is completed, the motor can be started to automatically replace the filter membrane, so that new filter membranes can be used for each measurement, thereby guaranteeing the accuracy of the measurement results. The counter is arranged, so that workers can observe the number of times of automatic filter membrane replacement and remind the workers to replace the entire filter membrane in time.

Description

TECHNICAL FIELD

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

[0002] The pollution density index automatic measuring instrument is a device for evaluating the degree of membrane pollution by suspended particles in water through automation, and is used for measuring the sludge density index. The measurement principle of the sludge density index is to filter sewage by using a microporous filter membrane under constant pressure, to compare the time for filtering a certain amount of water initially and the time for filtering a certain amount of water again after continuous filtering for a certain period of time, to calculate the increment of filtration time caused by the blocking of the membrane by suspended particles, and to quantify the membrane pollution rate. The higher the value, the more serious the pollution of suspended particles in the water body, and it is commonly used for evaluating the water quality of the membrane treatment system.

[0003] However, the prior art has the following problems:

[0004] Although the existing measuring instrument has a backwashing function, impurities will always adhere to the surface of the filter membrane after use. As the number of uses of the filter membrane increases, the adhered impurities will also increase, causing a certain error in the measurement result of each measurement due to the impurities adhered to the filter membrane itself. When measuring water samples with serious pollution for a long time, the filter membrane needs to be replaced frequently, which is time-consuming and affects the efficiency of the measurement operation. SUMMARY

[0005] The purpose of the present application is to provide a compact pollution density index automatic measuring instrument to solve the above problems. The filter membrane will always adhere to some impurities after use, and as the number of uses of the filter membrane increases, the adhered impurities will also increase, causing a certain error in the measurement result of each measurement due to the impurities adhered to the filter membrane itself. Details are described below.

[0006] To achieve the above purpose, the present application provides the following technical solutions:

[0007] The application provides a compact pollution density index automatic measuring instrument, which comprises a box body, a base plate fixedly arranged in the box body, a membrane box fixedly arranged on the base plate, a filter membrane arranged in the membrane box, a water sample box and a flushing box fixedly arranged in the box body, a water sample pipe fixedly arranged on the water sample box, a flushing pipe fixedly arranged on the flushing box, and a water outlet pipe fixedly connected to the membrane box; a filter membrane replacing assembly for automatically replacing the filter membrane; a flow disturbing assembly for disturbing water samples in the membrane box; the filter membrane replacing assembly comprises a driving shaft and a driven shaft, a first layer plate and a second layer plate are fixedly connected to the inside of the membrane box, the driving shaft and the driven shaft are rotatably arranged in the membrane box, the filter membrane is wound around the driving shaft and the driven shaft at two ends thereof, the filter membrane penetrates through the first layer plate and the second layer plate, a motor is arranged on the membrane box, the output end of the motor is in transmission connection with the driving shaft, and a counter is fixedly arranged on the outer wall of the membrane box.

[0008] Preferably, the driving shaft is located above the first layer plate, the driven shaft is located below the second layer plate, the contact positions of the first layer plate and the second layer plate with the filter membrane are provided with sealing strips, a flow guide cover is fixedly arranged in the inside of the membrane box, one end of the water sample pipe away from the water sample box is fixedly connected with the flow guide cover, two pressing strips are fixedly arranged in the inside of the membrane box, the two pressing strips are in sliding contact with the edges of the filter membrane, respectively, a test cavity is formed between the first layer plate, the second layer plate, the flow guide cover and the filter membrane, a clean water cavity is formed between the first layer plate, the second layer plate, the filter membrane, the side away from the flow guide cover and the membrane box, the water outlet pipe penetrates through the box body, the connection position of the water outlet pipe with the membrane box is located on the side of the filter membrane away from the flow guide cover, and the flushing pipe is connected to the membrane box at one end thereof away from the flushing box.

[0009] Preferably, two measuring wheels are rotatably arranged on the first layer plate and abut against the two sides of the filter membrane, respectively, a short shaft is fixedly connected to one of the measuring wheels, the short shaft penetrates through the membrane box, a pointer shaft is rotatably arranged on the outer wall of the membrane box, the short shaft and the pointer shaft are in transmission connection through a belt, a dial is arranged on the counter, a pointer is arranged on the pointer shaft, and the pointer is in contact with the dial in the rotating process.

[0010] Preferably, the counter is electrically connected with the motor through a wire, and a replacement indicating lamp is arranged on the counter.

[0011] As preferred, the film changing assembly further comprises a tensioning part, the tensioning part comprises a slide bar, the slide bar is horizontally slidably installed in the film box, the slide bar is located below the second layer plate, a protruding block is fixedly connected to the slide bar, a light bar is slidably connected through the second layer plate, a float and a tapered block are fixedly connected to two ends of the light bar respectively, the float is located above the second layer plate, the tapered block is in contact with the protruding block during movement, a ratchet wheel is fixedly connected to the outer wall of the driven shaft, a ratchet is arranged on the slide bar, the ratchet is in meshing with the ratchet wheel during movement, and a return spring is arranged between the slide bar and the film box.

[0012] As preferred, a gravity bar is slidably installed in the film box, two pressing wheels are rotatably installed on the gravity bar, and the two pressing wheels are in contact with the filter membrane wound on the driven shaft.

[0013] As preferred, the turbulence assembly comprises a rotating shaft, the rotating shaft is rotatably installed on the second layer plate, a water wheel is rotatably installed at one end of the rotating shaft, an annular inclined groove is arranged at the other end of the rotating shaft, the water wheel is located in the water sample pipe, and a plurality of first blades are fixedly connected to the outer wall of the rotating shaft.

[0014] As preferred, a sliding frame is slidably installed on the second layer plate, a ball ring is fixedly connected to the sliding frame, the ball ring is sleeved on the rotating shaft, balls are arranged on the inner wall of the ball ring, the balls are slidably connected with the annular inclined groove, a push rod is fixedly connected to the sliding frame, two upright columns are rotatably installed on the second layer plate, cams are fixedly connected to the bottom of the upright columns, sliding grooves are arranged at two ends of the push rod, a pin shaft is arranged on the cam, the pin shafts of the two cams are slidably connected with the two sliding grooves of the push rod respectively, and a plurality of second blades are fixedly connected to the outer wall of the upright columns.

[0015] As preferred, two spray pipes are rotatably installed on the second layer plate, the two spray pipes are rotatably connected with the flushing pipe, a first protruding rod is fixedly connected to the cam, a second protruding rod is fixedly connected to the outer wall of the spray pipe, two rotating rods are rotatably installed on the second layer plate, sliding grooves are arranged at two ends of the rotating rods, pin shafts are arranged on the first protruding rod and the second protruding rod respectively, the pin shafts of the two first protruding rods are slidably connected with one of the sliding grooves of the two rotating rods respectively, and the pin shafts of the two second protruding rods are slidably connected with the other of the sliding grooves of the two rotating rods respectively.

[0016] The beneficial effects are that:

[0017] 1. The compact pollution density index automatic measuring instrument, through the setting of the membrane replacement assembly, the motor can be started to automatically replace the membrane after each sludge density index measurement is completed, so that each measurement can use a new filter membrane, thereby ensuring the accuracy of the measurement result; through the setting of the counter, the worker can observe the number of times of automatic membrane replacement of the filter membrane, and remind the worker to replace the entire filter membrane in time.

[0018] 2. The compact pollution density index automatic measuring instrument, through the setting of the tensioning part, the ratchet can lock the ratchet wheel during the measurement process, thereby fixing the driven shaft, thereby maintaining the tensioning state of the filter membrane, avoiding the relaxation of the filter membrane due to the water pressure, and the two pressure wheels of the gravity rod are always pressed against the filter membrane wound on the driven shaft, avoiding loosening of the driven shaft during winding.

[0019] 3. The compact pollution density index automatic measuring instrument, through the setting of the turbulence assembly, a plurality of first blades agitate the water sample in the test chamber, so that the impurities are more uniformly distributed in the water, avoiding the deposition of part of the impurities, and a plurality of second blades can stir the water flow beside the filter membrane through reciprocating swing, so that the impurities attached to the filter membrane are more uniformly distributed, avoiding the uneven distribution of impurities on the surface of the filter membrane affecting the accuracy of the water passing time. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0021] Figure 1 is a schematic view of the appearance of the present application;

[0022] Figure 2 is a schematic view of the overall structure of the present application;

[0023] Figure 3 is a schematic view of the membrane box structure of the present application;

[0024] Figure 4 is a schematic view of the membrane replacement assembly structure of the present application;

[0025] Figure 5 is a schematic view of the filter membrane structure of the present application;

[0026] Figure 6 is a schematic view of the counter structure of the present application;

[0027] Figure 7 is a schematic view of the tensioning part structure of the present application;

[0028] Figure 8 is a schematic diagram of the turbulence component structure of the present application;

[0029] Figure 9 is a schematic diagram of the rotating shaft structure of the present application;

[0030] Figure 10 is a schematic diagram of the sliding carriage structure of the present application;

[0031] Figure 11 is a schematic diagram of the spray pipe structure of the present application;

[0032] Figure 12 is a schematic diagram of the rotating rod structure of the present application.

[0033] The reference signs are explained as follows: 1, box; 2, base plate; 3, membrane box; 31, first layer plate; 32, second layer plate; 33, pressing strip; 4, membrane replacing component; 41, driving shaft; 42, driven shaft; 43, filter membrane; 44, motor; 45, measuring wheel; 46, short shaft; 47, pointer shaft; 48, counter; 49, shifting piece; 5, tensioning part; 51, sliding rod; 52, protruding block; 53, light rod; 54, floating ball; 55, tapered block; 56, ratchet wheel; 57, gravity rod; 58, pressing wheel; 6, turbulence component; 61, rotating shaft; 62, water wheel; 63, first blade; 64, sliding carriage; 65, ball ring; 66, annular inclined chute; 67, shifting rod; 68, stand; 69, cam; 610, second blade; 611, first protruding rod; 612, rotating rod; 613, second protruding rod; 7, water sample box; 71, water sample pipe; 72, flow guide cover; 8, flushing box; 81, flushing pipe; 82, spray pipe; 9, water outlet pipe. DETAILED DESCRIPTION

[0034] In order to make the objectives, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described in detail below. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0035] Embodiment 1

[0036] Please refer to Figure 1 - Figure 5The utility model relates to a kind of compact pollution density index automatic measuring instrument, comprising: box 1, base plate 2 is fixedly installed inside box 1, membrane box 3 is fixedly installed on base plate 2, filter membrane 43 is arranged in the inside of membrane box 3, water sample box 7 and flushing box 8 are fixedly installed in box 1, water sample tube 71 is fixedly installed on water sample box 7, flushing pipe 81 is fixedly installed on flushing box 8, water outlet pipe 9 is fixedly connected on membrane box 3;Membrane replacement assembly 4 is used to automatically replace filter membrane 43;Membrane replacement assembly 4 includes driving shaft 41 and driven shaft 42, the inside of membrane box 3 is fixedly connected with first layer plate 31 and second layer plate 32, driving shaft 41 and driven shaft 42 are rotatably installed in membrane box 3, both ends of filter membrane 43 are fixedly wound on driving shaft 41 and driven shaft 42 respectively, filter membrane 43 penetrates first layer plate 31 and second layer plate 32, motor 44 is installed on membrane box 3, the output end of motor 44 is drivingly connected with driving shaft 41, counter 48 is fixedly installed on the outer wall of membrane box 3, motor 44 is started, motor 44 drives driving shaft 41 to rotate, driving shaft 41 winds filter membrane 43, filter membrane 43 is wound and driven shaft 42 is rotated, and the filter membrane 43 not used on driven shaft 42 is wound on driving shaft 41 by winding of driving shaft 41, to realize the effect of automatic membrane replacement.

[0037] Further, please refer to Figure 3 Figure 5 Driving shaft 41 is located above first layer plate 31, driven shaft 42 is located below second layer plate 32, the contact parts of first layer plate 31 and second layer plate 32 with filter membrane 43 are provided with sealing strips, flow guide cover 72 is fixedly installed in the inside of membrane box 3, one end of water sample tube 71 away from water sample box 7 is fixedly connected with flow guide cover 72, two pressure strips 33 are fixedly installed in the inside of membrane box 3, two pressure strips 33 are slidably contacted with two edges of filter membrane 43 respectively, two edges of filter membrane 43 are pressed by two pressure strips 33, to avoid filter membrane 43 to be wrinkled, test cavity is formed between first layer plate 31, second layer plate 32, flow guide cover 72 and filter membrane 43, clean water cavity (as shown in Figure 5 Pressure sensor is arranged in test cavity, liquid level sensor and timer are arranged in clean water cavity, water outlet pipe 9 penetrates box 1, the connecting place of water outlet pipe 9 and membrane box 3 is located at the side of filter membrane 43 away from flow guide cover 72, one end of flushing pipe 81 away from flushing box 8 is connected with membrane box 3, the connecting place of flushing pipe 81 and membrane box 3 is located at the side of filter membrane 43 close to flow guide cover 72 (as shown in Figure 8 ​As shown), the box 1 is provided with a control panel, water pump group, flushing pump group and exhaust device, the exhaust device is used for discharging the gas in the test chamber during measurement, the pressure sensor controls the power of the water pump group, so that the water pressure in the test chamber is kept at a set value, the liquid level sensor measures the clean water volume of the clean water chamber, when the clean water reaches the set volume, the timer transmits data to the control panel, and the sludge density index data is obtained through the calculation of the control panel, after one measurement is completed, the water in the clean water chamber is discharged through the water outlet pipe 9.

[0038] Further, please refer to Figure 5 - Figure 6 The first layer plate 31 is rotatably provided with two measuring wheels 45, and the two measuring wheels 45 are respectively in abutment with the two sides of the filter membrane 43. One of the two measuring wheels 45 is fixedly connected with a short shaft 46, the short shaft 46 penetrates the membrane cartridge 3, the membrane cartridge 3 is rotatably provided with a pointer shaft 47, the short shaft 46 and the pointer shaft 47 are connected through a belt transmission, the counter 48 is provided with a dial 49, the pointer shaft 47 is provided with a pointer, the pointer is in contact with the dial 49 in the rotation process, the two measuring wheels 45 are made of elastic material and have a large friction with the filter membrane 43, when the filter membrane 43 is wound, the two measuring wheels 45 are driven to rotate, the short shaft 46 drives the pointer shaft 47 to rotate through the belt, when the pointer shaft 47 rotates one round, the filter membrane 43 is replaced, when the pointer on the pointer shaft 47 rotates one round, the dial 49 is contacted and dialled, the dial 49 drives the counter 48 to count, and the staff can observe the current membrane replacement times through the counter 48.

[0039] Further, please refer to Figure 6 The counter 48 is electrically connected with the motor 44 through a wire, the counter 48 is provided with a replacement indicator light, when the counter 48 is started, the wire is used to control the motor 44 to be closed, so as to stop the membrane replacement, when the number on the counter 48 reaches a limited value, it represents that the filter membrane 43 on the driven shaft 42 is used up, at this time, the replacement indicator light is lighted, and the staff needs to replace the entire filter membrane 43.

[0040] In addition, please refer to Figure 5 , Figure 7The membrane replacement assembly 4 further comprises a tensioning part 5, the tensioning part 5 comprising a sliding rod 51 horizontally slidingly installed in the membrane box 3, the sliding rod 51 being located below the second layer plate 32, the sliding rod 51 being fixedly connected with a protruding block 52, the second layer plate 32 being slidingly connected with a light rod 53, two ends of the light rod 53 being fixedly connected with a floating ball 54 and a tapered block 55 respectively, the floating ball 54 being located above the second layer plate 32, the tapered block 55 being in contact with the protruding block 52 in the movement process, the outer wall of the driven shaft 42 being fixedly connected with a ratchet wheel 56, the sliding rod 51 being provided with a ratchet, the ratchet being in mesh with the ratchet wheel 56 in the movement process, the sliding rod 51 and the membrane box 3 being provided with a return spring, after water enters the clean water cavity, the floating ball 54 floats up to drive the light rod 53 to move upwards, the tapered block 55 is in contact with the protruding block 52 when moving upwards and drives the sliding rod 51 to move towards the ratchet wheel 56, so that the ratchet on the sliding rod 51 is in mesh with the ratchet wheel 56, the ratchet locks the ratchet wheel 56, at this time, the ratchet wheel 56 and the driven shaft 42 cannot rotate, so as to maintain the tensioning state of the filter membrane 43 and avoid the relaxation of the filter membrane 43 due to the water pressure.

[0041] In addition, please refer to Figure 7 , the inside of the membrane box 3 is slidingly installed with a gravity rod 57, two pressing wheels 58 are rotatably installed on the gravity rod 57, the two pressing wheels 58 are in contact with the filter membrane 43 wound on the driven shaft 42, the gravity rod 57 is lowered by gravity, so that the two pressing wheels 58 are always pressed against the filter membrane 43 wound on the driven shaft 42, avoiding loosening of the driven shaft 42 when winding, and maintaining the tensioning state of the filter membrane 43.

[0042] It is worth noting that, please refer to Figure 3 , Figure 8 - Figure 10 , the turbulence assembly 6 is used for disturbing the water sample in the membrane box 3; the turbulence assembly 6 comprises a rotating shaft 61 rotatably installed on the second layer plate 32, one end of the rotating shaft 61 being rotatably installed with a water wheel 62, the other end of the rotating shaft 61 being provided with an annular inclined groove 66, the water wheel 62 being located in a water sample pipe 71 (as shown in Figure 8 ), the outer wall of the rotating shaft 61 being fixedly connected with a plurality of first blades 63, when water enters the water sample pipe 71, the water flow in the water sample pipe 71 drives the rotating shaft 61 to rotate through the water wheel 62, the rotating shaft 61 drives the plurality of first blades 63 to rotate, the plurality of first blades 63 agitate the water sample in the test cavity, so that the impurities are more uniformly distributed in the water, avoiding deposition of part of the impurities.

[0043] It is worth noting that, please refer to Figure 9 - Figure 10The second layer plate 32 is slidably provided with a sliding frame 64, the sliding frame 64 is fixedly connected with a ball ring 65, the ball ring 65 is sleeved on the rotating shaft 61, the inner wall of the ball ring 65 is provided with balls, the balls are slidably connected with the annular inclined groove 66, the sliding frame 64 is fixedly connected with a push rod 67, the second layer plate 32 is rotatably provided with two vertical columns 68, the bottom of the vertical column 68 is fixedly connected with a cam 69, the two ends of the push rod 67 are respectively provided with sliding grooves, the cam 69 is provided with a pin shaft, the pin shafts of the two cams 69 are respectively slidably connected with the two sliding grooves of the push rod 67 (as shown in Figure 10 When the annular inclined groove 66 rotates, the ball ring 65 and the sliding frame 64 are driven to reciprocate by the balls, the outer wall of the vertical column 68 is fixedly connected with a plurality of second blades 610, in the reciprocating process of the push rod 67, the two sliding grooves of the push rod 67 are matched with the pin shafts to drive the two cams 69 to reciprocate, the two cams 69 respectively drive the two vertical columns 68 to reciprocate, the plurality of second blades 610 on the two vertical columns 68 reciprocate, the plurality of second blades 610 are all located beside the filter membrane 43, the plurality of second blades 610 can stir the water flow beside the filter membrane 43 by reciprocating, so that the impurities attached to the filter membrane 43 are more evenly distributed, the accuracy of the water passing time is avoided to be affected by the uneven distribution of the impurities on the surface of the filter membrane 43, and then the accuracy of the sludge density index measurement is affected.

[0044] It is worth mentioning that, please refer to Figure 10 Figure 12 The second layer plate 32 is rotatably provided with two spray pipes 82, the two spray pipes 82 are rotatably connected with the flushing pipe 81, the cam 69 is fixedly connected with a first protruding rod 611, the outer wall of the spray pipe 82 is fixedly connected with a second protruding rod 613, the second layer plate 32 is rotatably provided with two rotating rods 612, the two ends of the rotating rod 612 are respectively provided with sliding grooves, the first protruding rod 611 and the second protruding rod 613 are respectively provided with pin shafts, the pin shafts of the two first protruding rods 611 are respectively slidably connected with one of the sliding grooves of the two rotating rods 612, the pin shafts of the two second protruding rods 613 are respectively slidably connected with the other sliding grooves of the two rotating rods 612, when the two cams 69 reciprocate, the pin shafts of the two first protruding rods 611 and the sliding grooves of the two rotating rods 612 can drive the two rotating rods 612 to reciprocate, the two rotating rods 612 drive the two spray pipes 82 to reciprocate through the two sliding grooves and the pin shafts of the two second protruding rods 613, the two spray pipes 82 reciprocate, which can expand the flushing range, thereby optimizing the flushing effect and minimizing the impurities attached to the surface of the filter membrane 43.

[0045] ​With the above structure, the working principle of the case is that the control panel, the water inlet pump group, the flushing pump group and the exhaust device are arranged on the box body 1. The water inlet pump group draws the water sample into the water sample box 7 for buffering. The water sample box 7 delivers the water sample to the test cavity of the membrane box 3 through the water sample pipe 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. The pressure sensor is arranged in the test cavity. The liquid level sensor and the timer are arranged in the clean water cavity. The power of the water inlet pump group is controlled by the pressure sensor, so that the water pressure in the test cavity is kept at a set value. The liquid level sensor measures the volume of the clean water in the clean water cavity. When the clean water reaches the set volume, the timer transmits the data to the control panel. The sludge density index data is obtained through the calculation of the control panel. After the completion of the measurement, the water in the clean water cavity is discharged through the water outlet pipe 9. Then, the flushing pump group draws the clean water to the flushing box 8 for buffering, and then delivers it to the two spray pipes 82 through the flushing pipe 81. The two spray pipes 82 backwash the filter membrane 43, the test cavity water sample pipe 71 and the water sample box 7. The impurities in the test cavity and the water sample pipe 71 are emptied to avoid the contamination of the next measurement water sample by the residual impurities in the test cavity, thereby affecting the accuracy of the next measurement. The electromagnetic valves are arranged in the water sample pipe 71, the flushing pipe 81 and the water outlet pipe 9 respectively. When there is no water, the electromagnetic valves are closed. After the backwashing and the clean water cavity drainage are completed, the measurement is completed.

[0046] After the completion of the measurement, the motor 44 is started. The motor 44 drives the driving shaft 41 to rotate. The driving shaft 41 winds the filter membrane 43. The two pressing strips 33 press the two edges of the filter membrane 43 to avoid the wrinkles of the filter membrane 43. The filter membrane 43 drives the driven shaft 42 to rotate when it is wound. The unused filter membrane 43 on the driven shaft 42 is wound on the driving shaft 41 through the winding of the driving shaft 41, thereby realizing the effect of automatic membrane replacement. The two measuring wheels 45 are made of elastic material and have a large friction with the filter membrane 43. Therefore, the filter membrane 43 drives the two measuring wheels 45 to rotate when it is wound. The measuring wheel 45 connected with the short shaft 46 drives the short shaft 46 to rotate. 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, the number of rotations of the short shaft 46 is also fixed. When the pointer shaft 47 rotates one revolution, the filter membrane 43 is replaced. When the pointer on the pointer shaft 47 rotates one revolution, the pointer contacts and pushes the paddle 49. When the pointer shaft 47 completes one revolution, the paddle 49 drives the counter 48 to count. The workers can observe the current membrane replacement number through the counter 48. When the counter 48 is started, the motor 44 is closed through the wire, thereby stopping the membrane replacement. When the number on the counter 48 reaches the limited value, it represents that the filter membrane 43 on the driven shaft 42 is used up. At this time, the replacement indicator light is on. The workers need to replace the entire filter membrane 43.

[0047] The gravity rod 57 makes the two compression wheels 58 always compress the filter membrane 43 wound on the driven shaft 42 by gravity, avoids the looseness of the driven shaft 42 during winding, and maintains the tension state of the filter membrane 43. When the membrane is changed, the water in the clean water cavity is emptied, the light rod 53 and the floating ball 54 descend, the ratchet on the sliding rod 51 is disengaged from the ratchet wheel 56, the driven shaft 42 rotates to drive the ratchet wheel 56 to rotate. When the measurement starts, the water in the clean water cavity is filled, the floating ball 54 rises to drive the light rod 53 to move upwards, the taper block 55 at the bottom of the light rod 53 contacts the protrusion 52 and drives the protrusion 52 to move towards the ratchet wheel 56. The protrusion 52 drives the sliding rod 51 to move synchronously, and the sliding rod 51 moves towards the ratchet wheel 56. After the ratchet engages with the ratchet wheel 56, the ratchet locks the ratchet wheel 56, so that the ratchet wheel 56 and the driven shaft 42 cannot rotate, thereby maintaining the tension state of the filter membrane 43 and avoiding the relaxation of the filter membrane 43 due to water pressure. After the clean water in the clean water cavity is emptied, the taper block 55 moves downwards, the taper block 55 disengages from the protrusion 52, and the sliding rod 51 is reset by the elastic force of the return spring, so that the ratchet is disengaged from the ratchet wheel 56.

[0048] When the water sample pipe 71 is filled with water, the water flow in the water sample pipe 71 drives the rotating shaft 61 to rotate through the water wheel 62, the rotating shaft 61 drives the plurality of first blades 63 to rotate, the plurality of first blades 63 agitate the water sample in the test chamber, making the impurities more evenly distributed in the water, avoiding the deposition of part of the impurities. The rotating shaft 61 rotates, the annular chute 66 rotates, the annular chute 66 drives the ball ring 65 and the sliding carriage 64 to move back and forth through the balls. The sliding carriage 64 moves back and forth to drive the push rod 67 to move back and forth. In the process of reciprocating movement, the two grooves on the push rod 67 cooperate with the pin shaft to drive the two cams 69 to reciprocate, the two cams 69 drive the two upright columns 68 to reciprocate, and the plurality of second blades 610 on the two upright columns 68 reciprocate. The plurality of second blades 610 are located beside the filter membrane 43, and the plurality of second blades 610 can stir the water flow beside the filter membrane 43 through reciprocating movement, making the impurities attached to the filter membrane 43 more evenly distributed, avoiding uneven distribution of impurities on the surface of the filter membrane 43 affecting the accuracy of the water passing time, and further affecting the accuracy of the silt density index measurement.

[0049] When the two cams 69 reciprocate, the two first protruding rods 611 can drive the two rotating rods 612 to reciprocate through the cooperation between the pin shafts of the two first protruding rods 611 and the sliding grooves of the two rotating rods 612, and the two rotating rods 612 can drive the two spray pipes 82 to reciprocate through the cooperation between the sliding grooves and the pin shafts of the two second protruding rods 613. Since the water in the test cavity is discharged through the water sample pipe 71 during backwashing, the rotating shaft 61 can still rotate, and the two spray pipes 82 reciprocate, which can expand the washing range, thereby optimizing the washing effect, reducing the impurities attached to the surface of the filter membrane 43 as much as possible, and avoiding the increase in the thickness of the filter membrane 43 due to the attachment of too many impurities, thereby affecting the winding process.

[0050] The above merely illustrates the specific embodiments of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A compact automatic measuring instrument for contamination density index, characterized by, The utility model relates to a replaceable filter membrane device, including: Box (1), the box (1) inside fixed mounting has base plate (2), the base plate (2) on fixed mounting has membrane cartridge (3), the inside of membrane cartridge (3) is provided with filter membrane (43), the box (1) inside fixed mounting has water sample box (7) and flush box (8), the water sample box (7) on fixed mounting has water sample pipe (71), the flush box (8) on fixed mounting has flush pipe (81), the membrane cartridge (3) on fixed connection has outlet pipe (9): Filter membrane replacement assembly (4) is used for automatically replacing filter membrane (43); Turbulence subassembly (6) is used for disturbing water sample in membrane cartridge (3); The filter membrane replacement assembly (4) includes driving shaft (41) and driven shaft (42), the inside of membrane cartridge (3) is fixedly connected with first layer board (31) and second layer board (32), driving shaft (41) and driven shaft (42) are rotatably installed in membrane cartridge (3), both ends of filter membrane (43) are fixedly wound on driving shaft (41) and driven shaft (42) respectively, filter membrane (43) penetrates first layer board (31) and second layer board (32), motor (44) is installed on membrane cartridge (3), the output end of motor (44) is in transmission connection with driving shaft (41), and the outer wall of membrane cartridge (3) is fixedly installed with counter (48); The driving shaft (41) is located above the first layer board (31), the driven shaft (42) is located below the second layer board (32), the contact parts of the first layer board (31) and the second layer board (32) with filter membrane (43) are provided with sealing strips, the inside of membrane cartridge (3) is fixedly installed with flow guide cover (72), one end of water sample pipe (71) away from water sample box (7) is fixedly connected with flow guide cover (72), two pressing strips (33) are fixedly installed in the inside of membrane cartridge (3), two pressing strips (33) are in sliding contact with the edges of filter membrane (43) respectively, test cavity is formed between the first layer board (31), the second layer board (32), the flow guide cover (72) and filter membrane (43), the clean water cavity is formed between the first layer board (31), the second layer board (32), filter membrane (43) side away from flow guide cover (72) and membrane cartridge (3), the outlet pipe (9) penetrates the box (1), the connecting place of outlet pipe (9) and membrane cartridge (3) is located on the side of filter membrane (43) away from flow guide cover (72), one end of flush pipe (81) away from flush box (8) is connected with membrane cartridge (3), and the connecting place of flush pipe (81) and membrane cartridge (3) is located on the side of filter membrane (43) close to flow guide cover (72). The film replacing assembly (4) further comprises a tensioning part (5), the tensioning part (5) comprises a sliding rod (51), the sliding rod (51) is horizontally and slidingly installed in the membrane box (3), the sliding rod (51) is located below the second layer plate (32), the sliding rod (51) is fixedly connected with a protruding block (52), the second layer plate (32) is slidingly connected with a light rod (53) penetrating through the second layer plate (32), the two ends of the light rod (53) are fixedly connected with a floating ball (54) and a tapered block (55) respectively, the floating ball (54) is located above the second layer plate (32), the tapered block (55) is in contact with the protruding block (52) in the movement process, the outer wall of the driven shaft (42) is fixedly connected with a ratchet wheel (56), the sliding rod (51) is provided with a ratchet, the ratchet is in mesh with the ratchet wheel (56) in the movement process, and the sliding rod (51) and the membrane box (3) are provided with a return spring; The flow disturbing assembly (6) comprises a rotating shaft (61), the rotating shaft (61) is rotatably installed on the second layer plate (32), one end of the rotating shaft (61) is rotatably installed with a water wheel (62), the other end of the rotating shaft (61) is provided with an annular inclined chute (66), the water wheel (62) is located in the water sample pipe (71), and the outer wall of the rotating shaft (61) is fixedly connected with a plurality of first blades (63). The second layer plate (32) is slidingly installed with a sliding frame (64), the sliding frame (64) is fixedly connected with a ball ring (65), the ball ring (65) is sleeved on the rotating shaft (61), the inner wall of the ball ring (65) is provided with a ball, the ball is slidingly connected with the annular inclined chute (66), the sliding frame (64) is fixedly connected with a lever (67), the second layer plate (32) is rotatably installed with two vertical columns (68), the bottom of the vertical column (68) is fixedly connected with a cam (69), the two ends of the lever (67) are respectively provided with a sliding groove, the cam (69) is provided with a pin shaft, and the pin shafts of the two cams (69) are slidingly connected with the two sliding grooves of the lever (67) respectively, and the outer wall of the vertical column (68) is fixedly connected with a plurality of second blades (610).

2. The compact contamination density index automatic measuring instrument according to claim 1, characterized in that: The first layer plate (31) is rotatably installed with two measuring wheels (45), and the two measuring wheels (45) are respectively abutted with the two sides of the filter membrane (43). One of the measuring wheels (45) is fixedly connected with a short shaft (46), the short shaft (46) penetrates through the membrane box (3), the outer wall of the membrane box (3) is rotatably installed with a pointer shaft (47), the short shaft (46) and the pointer shaft (47) are drivingly connected through a belt, the counter (48) is installed with a dial (49), the pointer shaft (47) is provided with a pointer, and the pointer is in contact with the dial (49) in the rotation process.

3. The compact contamination density index automatic measuring instrument according to claim 2, characterized in that: The counter (48) is electrically connected with the motor (44) through a wire, and the counter (48) is provided with a replacement indicator lamp.

4. The compact contamination density index automatic measuring instrument according to claim 3, characterized in that: The inside of the membrane box (3) is slidingly installed with a gravity rod (57), the gravity rod (57) is rotatably installed with two pressing wheels (58), and the two pressing wheels (58) are in contact with the filter membrane (43) wound on the driven shaft (42).

5. The compact contamination density index automatic measuring instrument according to claim 4, characterized in that: Two spray pipes (82) are rotatably installed on the second layer plate (32), and the two spray pipes (82) are rotatably connected with the flushing pipe (81); the cam (69) is fixedly connected with a first protruding rod (611); the outer wall of the spray pipe (82) is fixedly connected with a second protruding rod (613); two rotating rods (612) are rotatably installed on the second layer plate (32); the rotating rods (612) are respectively provided with sliding grooves at two ends; the first protruding rod (611) and the second protruding rod (613) are respectively provided with pin shafts; the pin shafts of the two first protruding rods (611) are respectively slidably connected with one of the sliding grooves of the two rotating rods (612); and the pin shafts of the two second protruding rods (613) are respectively slidably connected with the other sliding grooves of the two rotating rods (612).

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