A membrane filtration device for lactic acid production wastewater treatment

Abstract

The application relates to the technical field of wastewater treatment, and discloses a membrane filtration equipment for lactic acid production wastewater treatment, which comprises a supporting frame, the inside of the supporting frame is sleeved with a membrane filtration assembly, and the membrane filtration assembly is composed of a membrane filtration shell and a concentration membrane assembly sleeved in the membrane filtration shell. The multifunctional filtration auxiliary device is composed of a lead screw transmission assembly, a hollow liquid guide assembly, a connecting pipe, a composite material guide plate, a main liquid conveying pipe and a clutch servo motor. After the multifunctional filtration auxiliary device is combined with the membrane filtration assembly, an elastic folding hose and an auxiliary annular pipe, the composite material guide plate serves as a raw material output terminal, can perform prefiltration treatment on the filtration of the concentration membrane assembly, reduces the filtration pressure of the concentration membrane assembly, and the clutch servo motor can synchronously drive the main liquid conveying pipe through the reciprocating lifting transmission of the hollow liquid guide assembly, the connecting pipe and the composite material guide plate by the lead screw transmission assembly, so that the raw material can be cut, dispersed and sprayed to the inner wall of the concentration membrane assembly.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of wastewater treatment, in particular to a membrane filtration equipment for lactic acid production wastewater treatment. BACKGROUND

[0002] Lactic acid is a colorless liquid, and industrial lactic acid is a colorless to light yellow liquid, has no odor, is hygroscopic, and has a very wide application range, for example, is used in fruit wine, beverages, meat, food, cake making, vegetable (olive, small cucumber, pearl onion) pickling, and can processing, grain processing, fruit storage, and the like, and has the effects of pH value adjustment, bacterium inhibition, shelf life extension, seasoning, food color and luster maintenance, and product quality improvement.

[0003] At present, in the lactic acid production process, dilute lactic acid containing 15-20% needs to be concentrated by heat concentration, but a large amount of dilute lactic acid containing about 0.6% lactic acid is generated in the heat concentration process, and the dilute lactic acid is directly discharged as wastewater by actual production personnel, however, although the reprocessing process is saved, resources are wasted, environmental protection pressure is increased, and the overall process is not improved, therefore, the application provides a membrane filtration equipment for lactic acid production wastewater treatment to solve the problems in the background art. SUMMARY

[0004] The application provides a membrane filtration equipment for lactic acid production wastewater treatment, and solves the problems in the background art.

[0005] The application provides the following technical scheme: a membrane filtration equipment for lactic acid production wastewater treatment, comprising a supporting frame, a membrane filtration assembly is arranged in the supporting frame, the membrane filtration assembly is composed of a membrane filtration shell and a concentration membrane assembly arranged in the membrane filtration shell, an annular space is arranged between the membrane filtration shell and the concentration membrane assembly, a dilute liquid discharge valve pipe is arranged between the annular space and the bottom of the concentration membrane assembly, a concentrated liquid discharge valve pipe is arranged between the annular space and the bottom of the concentration membrane assembly, an elastic folding hose and an auxiliary annular pipe are arranged on the top of the supporting frame, one end of the elastic folding hose is connected with the auxiliary annular pipe.

[0006] A lead screw transmission assembly and a hollow liquid guide assembly are arranged in the concentration membrane assembly, the hollow liquid guide assembly is in transmission connection with the output structure of the lead screw transmission assembly, a communication pipe in space communication with the hollow liquid guide assembly is arranged at the bottom structure of the hollow liquid guide assembly, and a composite material guide plate in space communication with the communication pipe is arranged at one end of the communication pipe.

[0007] The top of the hollow liquid guide assembly is connected with a main infusion tube, the top of the main infusion tube and the top of the lead screw transmission assembly penetrate the membrane filter shell and are respectively connected with an auxiliary annular tube and drivingly connected with a brake servo motor, and the top of the main infusion tube is provided with a first shaft seal ring at the sleeving position of the membrane filter shell top structure.

[0008] The lead screw transmission assembly includes a lead screw and a nut, the inner side of the middle part of the nut is threadedly connected to the surface of the lead screw, the top of the lead screw penetrates the membrane filter shell top structure and is drivingly connected to the output end of the brake servo motor, and a bearing and a second shaft seal ring are sleeved between the top of the lead screw and the membrane filter shell top structure to ensure the stability of the structural connection and the sealing effect of the connection.

[0009] The hollow liquid guide assembly is composed of an annular hollow plate and hollow extension plates, the number of the hollow extension plates is not less than two and they are installed at equal intervals along the circumference of the annular hollow plate, and the annular hollow plate is provided with guide holes that are not in communication with the space of the annular hollow plate, so as to meet the multi-directional raw material output and make the concentrated membrane assembly filter uniformly and comprehensively.

[0010] The number of the composite material guide plate and the communication pipe is the same as that of the hollow extension plate, the composite material guide plate includes a support frame plate and a filter screen, the surface of the support frame plate is provided with a recessed groove, the filter screen is nested in the recessed groove, one end of the support frame plate is fixedly sleeved with the communication pipe and is in communication with the internal space of the communication pipe, and the other end of the communication pipe is provided with a transition liquid inlet groove in communication with the internal space of the corresponding hollow extension plate, the composite material guide plate is in communication with the hollow liquid guide assembly through the communication pipe, thereby serving as a terminal structure for raw material output and being capable of pre-filtering the raw material while outputting.

[0011] The other end of the communication pipe is movably sleeved with a sealing ring at the bottom of the corresponding hollow extension plate and is in a penetrating state, the end of the other end of the communication pipe is drivingly connected with an engagement adjusting component, an elastic reset rod is arranged between the top of the engagement adjusting component and the corresponding guide hole, and the top surface of the annular hollow plate is connected with a magnetic attraction limiting component.

[0012] The engagement adjusting component includes a straight-toothed plate and an adjusting gear, the middle part of the adjusting gear is fixedly connected to the end of the other end of the communication pipe, the middle part of the straight-toothed plate is in engagement with the adjusting gear, and the length of the straight-toothed plate is greater than that of the hollow extension plate, so that the engagement adjusting component can adjust the use state of the composite material guide plate in an engagement driving manner, thereby expanding other use functions of the device.

[0013] The elastic reset rod is composed of a T-shaped rod and an auxiliary spring, two ends of the T-shaped rod are fixedly connected at the top of the straight-toothed plate and the through guide hole respectively, and two ends of the auxiliary spring are fixedly connected at the top surface of the T-shaped rod and the top surface of the annular hollow plate respectively, the magnetic attraction limiting part is composed of a connecting sleeve plate and an electromagnetic suction disc, the electromagnetic suction disc is sleeved in the inner part of one end of the connecting sleeve plate and is aligned with the T-shaped rod, and the other end of the connecting sleeve plate is fixedly connected at the top surface of the annular hollow plate, the elastic reset rod and the magnetic attraction limiting part are stop conditions for the reciprocating operation of the straight-toothed plate, and the overall stability of the adjusted meshing adjusting part can be ensured.

[0014] The structure of the dilute liquid discharge valve pipe and the concentrated liquid discharge valve pipe is the same and is composed of a ring pipe and a transition pipe and an output valve pipe connected to the ring pipe, the transition pipe in the dilute liquid discharge valve pipe and the transition pipe in the concentrated liquid discharge valve pipe are respectively sleeved at the bottom of the annular space of the corresponding membrane filtration assembly and the bottom of the concentration membrane assembly, so that the combined use requirement of multiple membrane filtration assemblies is met.

[0015] The present application has the following beneficial effects:

[0016] 1、The present application is composed of a lead screw transmission assembly, a hollow liquid guide assembly, a connecting pipe, a composite material guide plate, a main liquid conveying pipe and a clutch servo motor, and after being combined with a membrane filtration assembly, an elastic folding hose and an auxiliary annular pipe, the composite material guide plate serves as a raw material output terminal, can pre-filter the filtration of the concentration membrane assembly, reduces the filtration pressure of the concentration membrane assembly, and the clutch servo motor drives the reciprocating lifting of the hollow liquid guide assembly, the connecting pipe and the composite material guide plate through the lead screw transmission assembly, can be synchronized with the main liquid conveying pipe, so that the raw material is sprayed to the inner wall of the concentration membrane assembly in a cutting and dispersing manner, and the filtration effect of the concentration membrane assembly is optimized.

[0017] 2、The present application is composed of an extension structure of a meshing adjusting part, an elastic reset rod and a magnetic attraction limiting part, and after being combined with the above-mentioned multifunctional filtration auxiliary device, the raw material can be pressurized during the filtration process of the concentration membrane assembly, the auxiliary filtration effect, the mechanical transmission contact effect and the scraping and cleaning of the inner wall of the concentration membrane assembly can be realized, the long-term high-efficiency filtration effect of the concentration membrane assembly can be ensured, the recovery of lactic acid with low concentration and the water reuse can be realized, the resource waste caused by lactic acid discharge can be solved, the problem of environmental protection wastewater discharge in the production process of lactic acid can be solved, and the water resource can be saved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a three-dimensional schematic view of the structure of the present application;

[0019] Figure 2A schematic diagram of the front view of the structure of the present application;

[0020] Figure 3 A schematic diagram of the top view of the structure of the present application;

[0021] Figure 4 A schematic diagram of the sectional view of the membrane filtration assembly of the structure of the present application;

[0022] Figure 5 A schematic diagram of the enlarged view of the membrane filtration assembly of the structure of the present application;

[0023] Figure 6 A schematic diagram of the enlarged view of the hollow liquid guide assembly of the structure of the present application;

[0024] Figure 7 A schematic diagram of the partial sectional view of the communication pipe of the structure of the present application.

[0025] In the figure: 1, support frame; 2, membrane filtration assembly; 21, membrane filtration shell; 22, concentrated membrane assembly; 3, dilute liquid discharge valve pipe fitting; 4, concentrated liquid discharge valve pipe fitting; 5, elastic folding hose; 6, auxiliary annular pipe; 7, screw drive assembly; 71, lead screw; 72, nut; 8, hollow liquid guide assembly; 81, annular hollow plate; 82, hollow extension plate; 9, communication pipe; 10, composite material guide plate fitting; 11, main liquid conveying pipe; 12, clutch servo motor; 13, meshing adjustment component; 131, straight toothed plate; 132, adjustment gear; 14, elastic reset rod; 15, magnetic attraction limiting component. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0027] Please refer to Figures 1-7 A membrane filtration device for lactic acid production wastewater treatment, comprising a support frame 1, a membrane filtration assembly 2 is sleeved in the support frame 1, and the membrane filtration assembly 2 is composed of a membrane filtration shell 21 and a concentrated membrane assembly 22 sleeved in the membrane filtration shell 21, and an annular accommodation space is arranged between the membrane filtration shell 21 and the concentrated membrane assembly 22, a dilute liquid discharge valve pipe fitting 3 and a concentrated liquid discharge valve pipe fitting 4 are respectively arranged between the annular accommodation space and the bottom of the concentrated membrane assembly 22, an elastic folding hose 5 and an auxiliary annular pipe 6 are arranged on the top of the support frame 1, and one end of the elastic folding hose 5 is connected with the auxiliary annular pipe 6;

[0028] The concentrated membrane assembly 22 is respectively sleeved with the lead screw transmission assembly 7 and the hollow liquid guide assembly 8. The hollow liquid guide assembly 8 is in transmission connection with the output structure of the lead screw transmission assembly 7. The lead screw transmission assembly 7 comprises a lead screw 71 and a nut 72. The nut 72 is threadedly connected to the surface of the lead screw 71 at the middle inner side. The top of the lead screw 71 penetrates the top structure of the membrane filter shell 21 and is in transmission connection with the output end of the holding brake servo motor 12. A bearing and a second shaft sealing ring are sleeved between the top of the lead screw 71 and the top structure of the membrane filter shell 21 to ensure the stability of the structural connection and the sealing effect of the connection. The hollow liquid guide assembly 8 is composed of an annular hollow plate 81 and hollow extension plates 82. The number of the hollow extension plates 82 is not less than two and is installed equidistantly along the circumference of the annular hollow plate 81. The annular hollow plate 81 is provided with guide holes that are not communicated with the space of the annular hollow plate 81. The guide holes satisfy the multi-directional raw material output, so that the concentrated membrane assembly 22 can be uniformly filtered in an all-round way.

[0029] The bottom structure of the hollow liquid guide assembly 8 is sleeved with a communication pipe 9 which is communicated with the space of the bottom structure. One end of the communication pipe 9 is sleeved with a composite material guide plate 10 which is communicated with the space of the communication pipe 9. The number of the composite material guide plate 10 and the communication pipe 9 is the same as that of the hollow extension plates 82. The composite material guide plate 10 comprises a support frame plate and a filter screen. The surface of the support frame plate is provided with a recess. The filter screen is nested in the recess. The support frame plate is fixedly sleeved with one end of the communication pipe 9 and is communicated with the inner space of the communication pipe 9. The other end of the communication pipe 9 is provided with a transition liquid inlet groove which is communicated with the inner space of the corresponding hollow extension plate 82. The composite material guide plate 10 is communicated with the hollow liquid guide assembly 8 through the communication pipe 9, thereby serving as a terminal structure of the raw material output. The composite material guide plate 10 can pre-filter the raw material while outputting the raw material.

[0030] The other end of the communication pipe 9 is movably sleeved in the bottom of the corresponding hollow extension plate 82 in a penetrating state through a sealing ring. The end of the other end of the communication pipe 9 is in transmission connection with an engagement adjusting part 13. An elastic reset rod 14 is arranged between the top of the engagement adjusting part 13 and the corresponding guide hole. A magnetic attraction limiting part 15 is connected to the top surface of the annular hollow plate 81.

[0031] The top of the hollow liquid guide assembly 8 is connected with a main liquid conveying pipe 11. The top of the main liquid conveying pipe 11 and the top of the lead screw transmission assembly 7 penetrate the membrane filter shell 21 and are respectively connected with the auxiliary annular pipe 6 and in transmission connection with the holding brake servo motor 12. A first shaft sealing ring is arranged at the sleeving position of the top of the main liquid conveying pipe 11 and the top structure of the membrane filter shell 21.

[0032] The meshing adjusting component 13 comprises a straight-toothed plate 131 and an adjusting gear 132. The middle part of the adjusting gear 132 is fixedly connected to the end head at the other end of the communication pipe 9, and the middle part of the straight-toothed plate 131 is in meshing connection with the adjusting gear 132. The length value of the straight-toothed plate 131 is greater than that of the hollow extension plate 82. The meshing adjusting component 13 can adjust the use state of the composite material guide plate 10 in a meshing transmission manner, thereby expanding other use functions of the device.

[0033] The elastic reset rod 14 is composed of a T-shaped rod and an auxiliary spring. The two ends of the T-shaped rod are fixedly connected to the top of the straight-toothed plate 131 and the through guide hole, respectively. The two ends of the auxiliary spring are fixedly connected to the top surface of the T-shaped rod and the top surface of the annular hollow plate 81, respectively. The magnetic attraction limiting component 15 is composed of a connecting sleeve plate and an electromagnetic suction disc. The electromagnetic suction disc is sleeved in the inner part of one end of the connecting sleeve plate and is aligned with the T-shaped rod. The inner part of the other end of the connecting sleeve plate is fixedly connected to the top surface of the annular hollow plate 81. The elastic reset rod 14 and the magnetic attraction limiting component 15 serve as the stop condition for the reciprocating operation of the straight-toothed plate 131, which can ensure the overall stability of the adjusted meshing adjusting component 13.

[0034] The dilute liquid discharge valve pipe 3 and the concentrated liquid discharge valve pipe 4 have the same structure and are each composed of a ring pipe and a transition pipe and an output valve pipe connected to the ring pipe. The transition pipe in the dilute liquid discharge valve pipe 3 and the transition pipe in the concentrated liquid discharge valve pipe 4 are respectively sleeved in the bottom of the annular space of the corresponding membrane filtration assembly 2 and the bottom of the concentrated membrane assembly 22, thereby meeting the combined use requirement of multiple membrane filtration assemblies 2.

[0035] Working principle:

[0036] Embodiment one

[0037] The raw material to be processed from the outside world is output to the main liquid conveying pipe 11 through the elastic folding hose 5 and the auxiliary annular pipe 6, conveyed to the inside of the hollow liquid guide assembly 8 by the main liquid conveying pipe 11, then split into the inside of multiple hollow extension plates 82 by the annular hollow plate 81, and then enters the inside of the corresponding multiple composite material guide plates 10 through the communication pipes 9 connected to the multiple hollow extension plates 82 and makes the conveying terminal with the multiple composite material guide plates 10, so as to convey the raw material to be processed to the inside of the concentrated membrane assembly 22. During the output process, the filter screen in the multiple composite material guide plates 10 can filter and pretreat the large-particle impurities in the raw material, thereby reducing the filtering pressure of the subsequent concentrated membrane assembly 22.

[0038] And to ensure the overall filtering effect of the concentration membrane assembly 22, the brake servo motor 12 can be started, and then the brake servo motor 12 drives the lead screw 71 to rotate synchronously, the hollow liquid guide assembly 8, the connecting pipe 9 and the composite material guide plate 10 are driven by the nut 72 to reciprocatingly ascend and descend in the concentration membrane assembly 22, and then the plurality of composite material guide plates 10 spray the raw materials in the form of cutting and spraying on the inner wall of the concentration membrane assembly 22 to perform overall filtering treatment, and the hollow liquid guide assembly 8 moves reciprocatingly, and the main liquid pipe 11 moves synchronously correspondingly.

[0039] And the filtered clear liquid enters the annular space through the concentration membrane assembly 22, and the filtered thick liquid still remains in the concentration membrane assembly 22, and the subsequent clear liquid can be output through the clear liquid discharge valve pipe 3, and the thick liquid can be output through the thick liquid discharge valve pipe 4.

[0040] Example two

[0041] The raw material to be processed from the outside world is output to the main liquid pipe 11 through the elastic folding hose 5 and the auxiliary annular pipe 6, and then is transported to the inside of the hollow liquid guide assembly 8 by the main liquid pipe 11, and then is shunted to the inside of the plurality of hollow extension plates 82 by the annular hollow plate 81, and then enters the inside of the plurality of composite material guide plates 10 through the connecting pipe 9 connected with the plurality of hollow extension plates 82 and is transported to the inside of the concentration membrane assembly 22 by the plurality of composite material guide plates 10 as the terminal, and the filter screen in the plurality of composite material guide plates 10 can filter and pretreat the large particles in the raw material to reduce the filtering pressure of the concentration membrane assembly 22, and to ensure the overall filtering effect of the concentration membrane assembly 22, the brake servo motor 12 can be started, and then the brake servo motor 12 drives the lead screw 71 to rotate synchronously, the hollow liquid guide assembly 8, the connecting pipe 9 and the composite material guide plate 10 are driven by the nut 72 to reciprocatingly ascend and descend in the concentration membrane assembly 22, and then the plurality of composite material guide plates 10 spray the raw materials in the form of cutting and spraying on the inner wall of the concentration membrane assembly 22 to perform overall filtering treatment, and the hollow liquid guide assembly 8 moves reciprocatingly, and the main liquid pipe 11 moves synchronously correspondingly.

[0042] And when the concentration membrane assembly 22 has too much raw material and the filtering effect of the concentration membrane assembly 22 is reduced, the raw material to be filtered can be pressurized by the structure, and the specific process is as follows.

[0043] The brake servo motor 12 is started, and then the brake servo motor 12 drives the lead screw 71 to rotate synchronously, the lead screw 71 engages the transmission nut 72, the nut 72 drives the hollow liquid guide assembly 8, the connecting pipe 9 and the composite material guide plate 10 to move downward in the inside of the concentration film assembly 22 until the maximum stroke in the downward direction of the lead screw 71, then the straight toothed plate 131 and the T-shaped rod are pressed to move upward, the top of the T-shaped rod contacts the magnetic surface of the electromagnetic chuck in the inside of the magnetic attraction limiting part 15, the electromagnetic chuck is opened to magnetically attract and limit the T-shaped rod, and the straight toothed plate 131 moves upward to engage and drive the adjusting gear 132 synchronously, so that the composite material guide plate 10 changes from the state of being perpendicular to the hollow liquid guide assembly 8 to the state of being parallel to the hollow liquid guide assembly 8, then the lead screw 71 engages and drives the nut 72, the nut 72 drives the hollow liquid guide assembly 8, the connecting pipe 9 and the composite material guide plate 10 to move reciprocatingly in the inside of the concentration film assembly 22, and the composite material guide plates 10 in the parallel state reciprocatingly move to press and process the raw materials in the inside of the concentration film assembly 22, so as to increase the contact pressure between the raw materials and the concentration film assembly 22 and ensure the rapid filtering effect.

[0044] The filtered clear liquid enters the annular space through the concentration film assembly 22, and the filtered thick liquid still stays in the inside of the concentration film assembly 22, the subsequent clear liquid can be output through the dilute liquid discharge valve pipe 3, and the thick liquid can be output through the thick liquid discharge valve pipe 4.

[0045] Example three

[0046] The external raw material to be processed is output to the main liquid conveying pipe 11 through the elastic folding hose 5 and the auxiliary annular pipe 6, conveyed to the inside of the hollow liquid guide assembly 8 by the main liquid conveying pipe 11, then split to the inside of the plurality of hollow extension plates 82 by the annular hollow plate 81, and then enters the inside of the corresponding plurality of composite material guide plate pieces 10 through the communication pipe 9 connected by the plurality of hollow extension plates 82 and makes the conveying terminal with the plurality of composite material guide plate pieces 10, and the raw material to be processed is conveyed to the inside of the concentration film assembly 22, and in the output process, the filter screen in the plurality of composite material guide plate pieces 10 can filter and pretreat the large particle impurities in the raw material, reduce the filtering pressure of the subsequent concentration film assembly 22, and in order to ensure the overall filtering effect of the concentration film assembly 22, the brake servo motor 12 can be started, and then the brake servo motor 12 drives the screw rod 71 to rotate synchronously, the screw rod 71 engages the transmission nut 72, the nut 72 drives the hollow liquid guide assembly 8, the communication pipe 9 and the composite material guide plate piece 10 to reciprocatingly ascend and descend in the concentration film assembly 22, and then the plurality of composite material guide plate pieces 10 spray the raw material in the form of cutting and spraying on the inner wall of the concentration film assembly 22, so that the raw material is subjected to overall filtering treatment, and in the reciprocating movement of the hollow liquid guide assembly 8, the main liquid conveying pipe 11 moves synchronously, the filtered clear liquid enters the annular space through the concentration film assembly 22, and the filtered thick liquid still remains in the inside of the concentration film assembly 22, the subsequent clear liquid can be output through the clear liquid discharge valve pipe 3, and the thick liquid can be output through the thick liquid discharge valve pipe 4;

[0047] When the concentration film assembly 22 is used for a long time, the brake servo motor 12 is started, and then the brake servo motor 12 drives the screw rod 71 to rotate synchronously, the screw rod 71 engages the transmission nut 72, the nut 72 drives the hollow liquid guide assembly 8, the communication pipe 9 and the composite material guide plate piece 10 to descend in the concentration film assembly 22 until the maximum stroke in the descending direction of the screw rod 71, then the straight toothed plate 131 and the T-shaped rod are pressed to move upward, the top of the T-shaped rod contacts the magnetic surface of the electromagnetic chuck in the inside of the magnetic attraction limiting part 15, the electromagnetic chuck is opened to magnetically attract and limit the T-shaped rod, and in the upward movement of the straight toothed plate 131, the straight toothed plate 131 synchronously engages the transmission adjusting gear 132, so that the composite material guide plate piece 10 changes from the state of being perpendicular to the hollow liquid guide assembly 8 to the state of being parallel to the hollow liquid guide assembly 8, and the surface of one side of the composite material guide plate piece 10 is in contact with the inner wall of the concentration film assembly 22;

[0048] Then, the screw rod 71 engages the transmission nut 72, the nut 72 drives the hollow liquid guide assembly 8, the communication pipe 9 and the composite material guide plate piece 10 to reciprocate in the concentration film assembly 22, and the plurality of composite material guide plate pieces 10 in the parallel state with the hollow liquid guide assembly 8 scrape and clean the accumulated impurities on the inner wall of the concentration film assembly 22 in the reciprocating movement, so that the concentration film assembly 22 can maintain the effect of sustainable and long-time rapid filtering.

[0049] It is to be noted that, in the present document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Furthermore, the term "comprising" is used in the present document to mean including at least the recited elements, but not excluding others. The term "comprising" is used in the present document to mean including at least the recited elements, but not excluding others.

[0050] While embodiments of the application have been shown and described, it is to be understood that the application is not limited to the details of the embodiments described, since numerous further modifications and changes can be apparent to one skilled in the art without departing from the spirit and scope of the application. The scope of the application is defined by the appended claims and their equivalents.

Claims

1. A membrane filtration device for treating lactic acid production wastewater, comprising a support frame (1), characterized in that: The support frame (1) is internally fitted with a membrane filter assembly (2), and the membrane filter assembly (2) is composed of a membrane filter housing (21) and a concentration membrane assembly (22) fitted inside the membrane filter housing (21). An annular clearance space is provided between the membrane filter housing (21) and the concentration membrane assembly (22). A dilute liquid discharge valve fitting (3) and a concentrated liquid discharge valve fitting (4) are respectively provided between the annular clearance space and the bottom of the concentration membrane assembly (22). An elastic folded hose (5) and an auxiliary annular pipe (6) are provided on the top of the support frame (1). One end of the elastic folded hose (5) is connected to the auxiliary annular pipe (6). The concentrating membrane assembly (22) is equipped with a screw drive assembly (7) and a hollow liquid guiding assembly (8). The hollow liquid guiding assembly (8) is connected to the output structure of the screw drive assembly (7). The bottom structure of the hollow liquid guiding assembly (8) is equipped with a connecting pipe (9) that communicates with its own structural space. One end of the connecting pipe (9) is equipped with a composite material guiding plate (10) that communicates with its own space. The hollow liquid guiding assembly (8) consists of an annular hollow plate (81) and a hollow extension plate (82). The number of hollow extension plates (82) is not less than two and they are installed at equal intervals along the circumference of the annular hollow plate (81). The annular hollow plate (81) has a guide hole that is not connected to its own space. The number of composite guide plate (10) and connecting pipe (9) is the same as the number of hollow extension plate (82). The composite guide plate (10) includes a support frame plate and a filter screen. The surface of the support frame plate is provided with a relief groove. The filter screen is nested in the relief groove. One end of the support frame plate is fixedly connected to the connecting pipe (9) and communicates with the internal space of the connecting pipe (9). The other end of the connecting pipe (9) is provided with a transition liquid inlet groove that communicates with the internal space of the corresponding hollow extension plate (82). The top of the hollow liquid guiding assembly (8) is connected to the main infusion pipe (11). The top of the main infusion pipe (11) and the top of the screw drive assembly (7) both penetrate the membrane filter housing (21). The top of the main infusion pipe (11) is connected to the auxiliary annular pipe (6). The top of the screw drive assembly (7) is connected to the brake servo motor (12). A first shaft sealing ring is provided at the fitting point between the top of the main infusion pipe (11) and the top structure of the membrane filter housing (21).

2. The membrane filtration equipment for treating lactic acid production wastewater according to claim 1, characterized in that: The lead screw drive assembly (7) includes a lead screw (71) and a nut (72). The inner side of the nut (72) is threaded onto the surface of the lead screw (71). The top of the lead screw (71) penetrates the top structure of the membrane filter housing (21) and is connected to the output end of the brake servo motor (12). A bearing and a second shaft sealing ring are fitted between the top of the lead screw (71) and the top structure of the membrane filter housing (21).

3. The membrane filtration equipment for treating lactic acid production wastewater according to claim 1, characterized in that: The other end of the connecting pipe (9) is movably fitted onto the bottom of the corresponding hollow extension plate (82) through a sealing ring and is in a through state. The end of the other end of the connecting pipe (9) is connected to a meshing adjustment component (13). An elastic reset rod (14) is provided between the top of the meshing adjustment component (13) and the corresponding guide hole. A magnetic suction limiting component (15) is connected to the top surface of the annular hollow plate (81).

4. The membrane filtration equipment for treating lactic acid production wastewater according to claim 3, characterized in that: The meshing adjustment component (13) includes a straight toothed plate (131) and an adjusting gear (132). The middle part of the adjusting gear (132) is fixedly connected to the end of the connecting pipe (9). The middle part of the straight toothed plate (131) is meshed with the adjusting gear (132). The length of the straight toothed plate (131) is greater than the length of the hollow extension plate (82).

5. The membrane filtration equipment for treating lactic acid production wastewater according to claim 4, characterized in that: The elastic reset rod (14) consists of a T-shaped rod and an auxiliary spring. The two ends of the T-shaped rod are fixedly connected to the top of the straight tooth plate (131) and the through guide hole, respectively. The two ends of the auxiliary spring are fixedly connected to the top surface of the T-shaped rod and the top surface of the annular hollow plate (81), respectively. The magnetic suction limiting component (15) consists of a connecting sleeve plate and an electromagnetic chuck. The electromagnetic chuck is fitted inside one end of the connecting sleeve plate and aligned with the T-shaped rod. The other end of the connecting sleeve plate is fixedly connected to the top surface of the annular hollow plate (81).

6. The membrane filtration equipment for treating lactic acid production wastewater according to claim 1, characterized in that: The dilute discharge valve fitting (3) and the concentrated discharge valve fitting (4) have the same structure and are both composed of a ring pipe and a transition pipe and an output valve pipe connected to the ring pipe. The transition pipe inside the dilute discharge valve fitting (3) and the transition pipe inside the concentrated discharge valve fitting (4) are respectively fitted into the bottom of the annular clearance space of the corresponding membrane filter assembly (2) and the bottom of the concentration membrane assembly (22).

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