A multi-stage evaporation treatment apparatus for wastewater treatment and a method for using the same

Abstract

The application discloses a multistage evaporation treatment equipment for wastewater treatment and a use method thereof. The equipment comprises an equipment main body, a wastewater bucket is arranged at the left end of the equipment main body, a liquid inlet pipe is arranged on the surface of the wastewater bucket, a steam output pipe is arranged at the upper right corner of the equipment main body, a condenser is arranged below the steam output pipe, a vacuum pump is arranged outside a water pipe connected with the condenser, a condensate water tank is arranged below the left end of the condenser, a purification system is arranged at the right end of the condensate water tank through the water pipe, a mist eliminator is arranged on the equipment main body, a filter plate is arranged below the mist eliminator, a dredging mechanism is arranged below the filter plate, and a waste residue discharge pipe is arranged below the dredging mechanism. The bristles are in contact with the filter holes for cleaning, the normal work of the wastewater treatment is improved, the work efficiency is improved, the internal capacity is expanded, and the wastewater treatment efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wastewater treatment, in particular to a multi-stage evaporation treatment equipment for wastewater treatment and a use method thereof. BACKGROUND

[0002] A large amount of industrial wastewater is usually generated in the process of industrial production. The water used in the process of industrial production is properly treated and then reused for production or properly discharged. Based on the principle of evaporation concentration crystallization, multi-effect vacuum evaporation concentration crystallization is used to treat organic wastewater. After the salt in the concentrated liquid is separated, the concentrated liquid is recovered through a salt collector, and the concentrated liquid is dried and recovered or incinerated. The condensed water after evaporation is generally treated through subsequent biochemical treatment, so that the standard of wastewater discharge can be realized.

[0003] However, the existing multi-stage evaporation treatment equipment for wastewater treatment and the use method thereof still have some problems in operation and use.

[0004] 1. The existing wastewater is subjected to multi-stage treatment in the equipment body. Since the wastewater contains a large amount of impurities, the wastewater is subjected to evaporation concentration crystallization through the evaporator. Some waste liquid has certain cohesiveness, which can cause the filter holes of the filter plate arranged in the equipment body to be blocked, and can also cause the waste residue discharge pipe to be blocked, so that the space in the equipment body is reduced, the wastewater treatment capacity is gradually reduced, the water capacity in the equipment body is gradually reduced, and the wastewater treatment efficiency is low.

[0005] 2. The waste liquid with high viscosity can adhere to the inner wall and the pipe opening of the waste residue discharge pipe, so that the pipe wall is thickened, the diameter of the waste residue discharge pipe is gradually reduced, the normal discharge of waste liquid and waste residue is affected, the waste liquid and waste residue are accumulated in the equipment body, the internal capacity is reduced, the wastewater treatment efficiency is affected, the staff needs to dredge, which is very troublesome and laborious, increases the labor burden of the staff, and the efficiency is low. SUMMARY

[0006] The present application aims to provide a multi-stage evaporation treatment device for wastewater treatment and a use method thereof to solve the problem that some waste liquid in the market has certain adhesion, which can cause blockage of the filter holes of the filter plate arranged inside the main body of the device, and can also cause blockage of the waste residue discharge pipe, accumulate inside the main body of the device, reduce the space inside the main body of the device, gradually reduce the wastewater treatment capacity, gradually reduce the water capacity inside the main body of the device, and reduce the efficiency of wastewater treatment.

[0007] To achieve the above object, the present application provides the following technical scheme: a multi-stage evaporation treatment device for wastewater treatment and a use method thereof, comprising a device main body, a wastewater bucket is arranged at the left end of the device main body, a liquid inlet pipe is mounted on the surface of the wastewater bucket, a steam output pipe is mounted at the upper right corner of the device main body, a condenser is arranged inside the lower part of the steam output pipe, a water pipe connected with the condenser is externally provided with a vacuum pump, a condensate tank is arranged at the left end below the condenser, a purification system is mounted on the right end of the condensate tank through a water pipe, a mist separator is arranged on the device main body, a filter plate is arranged below the mist separator, a dredging mechanism is arranged below the filter plate, a waste residue discharge pipe is arranged below the dredging mechanism, and an anti-blocking mechanism is arranged inside the waste residue discharge pipe, and a collection tank is arranged below the anti-blocking mechanism.

[0008] The anti-blocking mechanism comprises a pressing plate, a pushing plate is arranged above the pressing plate, the surface of the pushing plate is arc-shaped, the top surface of the pressing plate is arc-shaped, the top of the pressing plate protrudes from the top of the waste residue discharge pipe, the top of the pressing plate is in arc-shaped correspondence with the top of the pushing plate, and the top of the pressing plate is in contact with the top of the pushing plate.

[0009] The anti-blocking mechanism further comprises a twisted rod, a spring and a long block, the bottom of the pressing plate is provided with the twisted rod, one end of the twisted rod is connected with the spring, the other end of the spring is connected to the inner wall of the long block, and the twisted rod and the spring constitute a telescopic reset structure.

[0010] The anti-blocking mechanism further comprises a bearing, a long rod and a scraper, the long rod is in threaded connection with the long groove in the long block and rotates, the outer portion of the long block is provided with a bearing, the outer portion of the bearing is provided with a long rod, the top of the long rod is provided with a scraper, the scraper is in contact with the inner wall of the waste residue discharge pipe, the outer portion of the bottom end of the long block is provided with a bearing, the outer portion of the bearing is provided with a fixing rod, the top of the fixing rod is provided with a sliding block, the sliding block is located in the sliding groove in the inner wall of the waste residue discharge pipe, and the sliding block and the sliding groove form a sliding structure.

[0011] The dredging mechanism comprises a motor, a rotating rod and a rotating disc, the top of the motor is provided with a rotating rod, the outer portion of the rotating rod is provided with a rotating disc, the longitudinal section of the rotating disc is in trapezoidal shape, the top of the rotating disc is in irregular undulating structure, a push rod is arranged on the outer portion of the rotating rod, so that the rotating rod drives the rotation of the push rod, and the anti-blocking mechanism is arranged in the waste residue discharge pipe.

[0012] Preferably, the dredging mechanism further comprises a vertical rod and a connecting rod, the upper portion of the rotating disc is provided with a vertical rod, the outer portion of the vertical rod is provided with a connecting rod, the connecting rod is in fixed connection with the rotating rod, the bottom of the vertical rod is in conical shape, and the bottom of the vertical rod is in contact with the top of the rotating disc.

[0013] Preferably, the dredging mechanism further comprises a belt and a dredging brush, the top end of the rotating rod protrudes into the rotating disc, the surface of the rotating rod is sleeved with a belt, the other end of the belt is sleeved with the surface of the dredging brush, the belt is provided with a plurality of groups, and the plurality of groups of belts are sequentially sleeved with the outer portion of the dredging brush.

[0014] Preferably, the dredging brush is provided with a plurality of groups, the plurality of groups of dredging brushes are distributed at equal intervals, the bottom of the plurality of groups of dredging brushes is connected with the surface of the rotating disc through a bearing, the surface of the dredging brush is provided with bristles, the bristles are in contact with the inner wall of the filter hole of the filter plate when moving upwards, and the dredging brush and the filter hole of the filter plate are in corresponding positions.

[0015] Preferably, the use method of the multi-stage evaporation treatment equipment for wastewater treatment comprises the following steps:

[0016] First step: introducing wastewater into the equipment, the workers introduce industrial wastewater into the wastewater tank, and then introduce the wastewater into the inner portion of the equipment body through the inlet pipe by the suction pump of the inlet pipe;

[0017] The second step is that the external driving device is started, so that the wastewater falls into the lower part through the mist separator; the staff starts the external driving of the evaporator, so that the wastewater is treated in the evaporator, and then is output to the inside of the condenser through the steam output pipe, and then the treated water is circulated to the inside of the condenser through the circulating water tank connected to the condenser, and then is output to the inside of the purification system through the water pipe, and then is output through the water outlet pipe;

[0018] The third step is to start the dredging mechanism, which is used for the effect of dredging the blockage of the filter plate, so that the waste residue and waste liquid treated by the equipment main body are better discharged, and are accumulated in the inside of the equipment main body, and are dredged and cleaned by the dredging mechanism.

[0019] The fourth step is to start the anti-blocking mechanism, which is used for the effect of cleaning and dredging the pipe wall; the bottom end of the long block is connected with the fixed rod through the bearing, and the top of the fixed rod is provided with a sliding block which slides in the sliding groove in the pipe wall, so that the cleaning and dredging effect is achieved.

[0020] Compared with the prior art, the beneficial effects of the multi-stage evaporation treatment equipment for wastewater treatment and the using method thereof are that:

[0021] 1. The dredging mechanism is used for dredging and cleaning; the motor is started to drive the rotating rod to rotate, the rotating rod drives the fixedly connected rotating disc to rotate, the top of the rotating disc is in irregular undulating structure, the rotating disc drives the vertical rod to move in the irregular undulating surface, a plurality of dredging brushes arranged above the top tray are driven by the vertical rod to move up and down reciprocatingly, the belt sleeved on the surface of the rotating rod drives the dredging brushes to rotate, and the plurality of dredging brushes rotate while moving up and down reciprocatingly, because the plurality of dredging brushes are vertically corresponding to the filter holes of the filter plate, the plurality of dredging brushes dredge the filter plate, the bristles contact the filter holes to clean, the normal work of wastewater treatment is improved, the work efficiency is improved, the internal capacity is expanded, and the wastewater treatment efficiency is improved.

[0022] 2. By setting the anti-blocking mechanism inside the waste residue discharge pipe, when the stirring rod rotates to the position above the waste residue discharge pipe, the stirring rod extrudes the pressing plate, due to the arc-shaped structure of the top of the pressing plate, the arc-shaped surface of the stirring rod and the arc-shaped surface of the pressing plate match and extrude, the pressing plate is driven by the downward extrusion force to rotate the twisted rod and the twisted groove inside the long block, the long block drives the scraper connected with the long rod on the surface to clean the waste liquid adhered to the inner wall of the waste residue discharge pipe, and the rotation of the long rod and the scraper also has a stirring effect, so that the waste liquid and waste residue fall into the inside of the collection box below more quickly, and when the pressing plate has no driving force, the bottom of the twisted rod is connected with the inner wall of the long block through the spring, the twisted rod and the spring form an extension reset structure, the twisted rod rotates reversely to reset, and the scraper is driven again to clean and dredge the pipe wall, the bottom of the long block is connected with the fixed rod through the bearing, and the top of the fixed rod is provided with a sliding block sliding in the sliding groove in the pipe wall, so that the cleaning and dredging effect is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a schematic view of the overall front view of the present application;

[0024] Figure 2 It is a schematic view of the enlarged structure of the overall dredging brush structure of the present application;

[0025] Figure 3 It is a schematic view of the three-dimensional structure of the dredging mechanism of the present application;

[0026] Figure 4 It is a schematic view of the enlarged structure of the waste residue discharge pipe of the present application;

[0027] Figure 5 It is a schematic view of the top view structure of the waste residue discharge pipe of the present application;

[0028] Figure 6 It is a schematic view of the side view structure of the waste residue discharge pipe of the present application.

[0029] In the figure: 1, equipment main body; 2, waste water bucket; 3, liquid inlet pipe; 4, mist separator; 6, filter plate; 7, steam output pipe; 8, condenser; 9, circulating water tank; 10, vacuum pump; 11, condensate tank; 12, purification system;

[0030] 13, dredging mechanism; 131, motor; 132, rotating rod; 133, rotating disc; 134, connecting rod; 135, vertical rod; 136, tray; 137, belt; 138, dredging brush;

[0031] 14, stirring rod; 15, waste residue discharge pipe; 16, collection box;

[0032] 17, anti-blocking mechanism; 171, pressing plate; 172, twisted rod; 173, long block; 174, spring; 175, bearing; 176, fixed rod; 177, long rod; 178, scraper. DETAILED DESCRIPTION

[0033] 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 of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0034] Please refer to Figures 1-6 The present application provides a technical solution: a multistage evaporation treatment device for wastewater treatment and a use method thereof, comprising a device main body 1, a wastewater barrel 2 is arranged at the left end of the device main body 1, and a liquid inlet pipe 3 is mounted on the surface of the wastewater barrel 2, a steam output pipe 7 is mounted at the upper right corner of the device main body 1, and a condenser 8 is arranged below the steam output pipe 7, a water pipe connected with the condenser 8 is externally provided with a vacuum pump 10, a condensate tank 11 is arranged below the left end of the condenser 8, a purification system 12 is mounted at the right end of the condensate tank 11 through a water pipe, the device main body 1 is provided with a mist separator 4, a filter plate 6 is arranged below the mist separator 4, a dredging mechanism 13 is arranged below the filter plate 6, a waste residue discharge pipe 15 is arranged below the dredging mechanism 13, and an anti-blocking mechanism 17 is arranged in the waste residue discharge pipe 15, and a collection tank 16 is arranged below the anti-blocking mechanism 17.

[0035] The anti-blocking mechanism 17 comprises a pressing plate 171, a push plate 14 is arranged above the pressing plate 171, the surface of the push plate 14 is arc-shaped, the top surface of the pressing plate 171 is arc-shaped, the top of the pressing plate 171 protrudes from the top of the waste residue discharge pipe 15, the top of the pressing plate 171 is in arc correspondence with the top of the push plate 14, and the top of the pressing plate 171 is in contact with the top of the push plate 14.

[0036] The anti-blocking mechanism 17 further comprises a twisted rod 172, a spring 174 and a long block 173, the bottom of the pressing plate 171 is provided with the twisted rod 172, one end of the spring 174 is connected to the bottom of the twisted rod 172, and the other end of the spring 174 is connected to the inner wall of the long block 173, and the twisted rod 172 and the spring 174 constitute a telescopic reset structure.

[0037] The anti-blocking mechanism 17 also includes a bearing 175, a long rod 177, and a scraper 178. The twisted rod 172 and the twisted groove inside the long block 173 are connected by a thread for rotation. The long block 173 is provided with a bearing on the outside, and the long rod 177 is installed on the outside of the bearing. The top of the long rod 177 is provided with a scraper 178, and the scraper 178 is in contact with the inner wall of the waste discharge pipe. The bottom end of the long block 173 is provided with a bearing on the outside, and the bearing 175 is provided with a fixing rod 176 on the outside. The top of the fixing rod 176 is provided with a slider, and the slider is located inside the groove on the inner wall of the waste discharge pipe 15. The slider and the groove form a sliding structure.

[0038] The unblocking mechanism 13 includes a motor 131, a rotating rod 132, and a turntable 133. The rotating rod 132 is located on the top of the motor 131, and the turntable 133 is located outside the rotating rod 132. The longitudinal section of the turntable 133 is trapezoidal, and the top of the turntable 133 has an irregular undulating structure. A lever 14 is located outside the rotating rod 132, which drives the lever 14 to rotate. An anti-blocking mechanism 17 is provided inside the waste discharge pipe 15.

[0039] The unblocking mechanism 13 also includes a vertical rod 135 and a connecting rod 134. The vertical rod 135 is provided above the turntable 133, and the connecting rod 134 is provided outside the vertical rod 135. The connecting rod 134 is fixedly connected to the rotating rod 132. The bottom of the vertical rod 135 is conical, and the bottom of the vertical rod 135 is in contact with the top of the turntable 133.

[0040] The unblocking mechanism 13 also includes a belt 137 and an unblocking brush 138. The top end of the rotating rod 132 protrudes through the inside of the turntable 133. The surface of the rotating rod 132 is fitted with a belt 137, and the other end of the belt 137 is fitted with the surface of the unblocking brush 138. Multiple sets of belts 137 are provided, and multiple sets of belts 137 are sequentially fitted with the outside of the unblocking brush 138.

[0041] Multiple sets of unclogging brushes 138 are provided, and the multiple sets of unclogging brushes 138 are distributed at equal intervals. The bottom of the multiple sets of unclogging brushes 138 is connected to the surface of the turntable 133 through bearings. The surface of the unclogging brushes 138 is provided with bristles, and the bristles contact the inner wall of the filter hole of the filter plate 6 when moving upward. The positions of the unclogging brushes 138 and the filter hole of the filter plate 6 correspond to each other.

[0042] A method for using a multi-stage evaporation treatment device for wastewater treatment includes the following steps:

[0043] Step 1: Wastewater is introduced into the equipment. The staff introduces industrial wastewater into the wastewater tank, and then uses a suction pump through the inlet pipe to introduce the wastewater into the main body of the equipment.

[0044] The second step is to start the external drive device, so that the wastewater falls into the lower part through the mist separator, the staff starts the external drive of the evaporator, so that the wastewater is treated in the evaporator, then output to the inside of the condenser through the steam output pipe, then through the circulating water tank connected to the condenser, the treated water is circulated to the inside of the condenser through the vacuum pump, then through the water pipe to enter the inside of the purification system, then through the water outlet pipe to discharge water;

[0045] The third step is to start the dredging mechanism, which acts on the effect of dredging the blockage of the filter plate, so that the device body cannot better discharge the waste residue and waste liquid after treatment, and the waste residue and waste liquid are accumulated in the device body. The dredging mechanism is set to dredge and clean it.

[0046] The fourth step is to start the anti-blocking mechanism, which acts on the effect of cleaning and dredging the pipe wall by the scraper. The outer end of the long block is connected with the fixed rod through the bearing, and the top of the fixed rod is provided with a sliding block which slides in the sliding groove in the pipe wall, so as to achieve the effect of cleaning and dredging.

[0047] Working principle: in the use of the wastewater treatment with multistage evaporation treatment equipment and its use method, first, the staff through the industrial wastewater into the wastewater bucket 2 inside, and then through the liquid inlet pipe 3 suction pump through the liquid inlet pipe 2 into the inside of the evaporator, and then the wastewater through the mist separator 4 fall into the lower, the staff through the start of the evaporator outside drive, so that the evaporator inside the wastewater treatment, and then through the steam output pipe 7 output to the inside of the condenser 8, and then through the condenser 8 connected with circulating water tank 9 after treatment of water through the vacuum pump 10 circulation output to the inside of the condenser water tank 11 in through the water pipe into the inside of the purification system 12, and then through the water outlet pipe for water, again, because the wastewater has more impurities, so that in the treatment of evaporator makes the wastewater evaporation concentration crystallization, some waste liquid has certain adhesion, will cause the problem of the filter plate of the equipment body 2 inside the hole blockage, and also will cause the waste residue discharge pipe orifice blockage, so that the equipment body 1 inside the waste residue and waste liquid can't be better discharged, accumulation in the equipment body 1 inside, through the setting of dredging mechanism 13 for dredging cleaning, through the start of motor 131 drive, so that the motor 131 drive rotating rod 132 rotation, rotating rod 132 drive fixed connection rotating disc 133 rotation, so that the top of the rotating disc 133 is irregular ups and downs type structure, so that the rotating disc 133 drive vertical rod 135 in irregular ups and downs type surface fitting movement, so that the vertical rod 135 drive the top tray 136 above setting of multiple dredging brush 138 for up and down reciprocating movement, because the rotating rod 131 top protruding rotating disc 133 top, so that the rotating rod 132 top surface sleeve belt 137 drive dredging brush 138 for autorotation, through the setting of multiple belt 137 in turn sleeve in the bottom end surface of multiple dredging brush 138, through the belt 137 of multiple groups of belt drive structure, so that the group dredging brush 138 in up and down reciprocating a certain time autorotation, because the multiple groups of dredging brush 138 and the filter hole of the filter plate 6 vertical corresponding, so that the multiple groups of dredging brush 138 for dredging the filter plate 6, the bristles and the filter hole contact cleaning, avoid the equipment body 1 in the wastewater treatment of the most important step can't work normally, influence work efficiency, and for the larger viscosity of waste liquid will be attached to the inner wall and the orifice of the waste residue discharge pipe 15, so that the pipe wall thickening, so that the diameter of the waste residue discharge pipe 15 gradually becomes smaller, affect the normal waste liquid and waste residue discharge, so that the waste liquid and waste residue in the equipment body 1 inside accumulation, reduce the internal capacity, influence the wastewater treatment efficiency, through the setting of the rotating rod 132 outside has the lever 14, so that the rotating rod 132 drive lever 14 rotation, and through the setting of the waste residue discharge pipe 15 inside has the anti blocking mechanism, so that when the lever 14 rotates to the upper position of the waste residue discharge pipe 15, so that the lever 14 extrusion pressure plate 171, because the top of the pressure plate 17 is arc structure, so that the arc surface of the lever 14 and the arc surface of the lever 14 fit extrusion,The downward extrusion force of the pressing plate 171 drives the twisted rod 172 and the twisted groove inside the long block 173 to rotate, so that the long block 173 drives the long rod connected scraper 178 to clean the waste liquid adhered to the inner wall of the waste residue discharge pipe 15, and the rotation of the long rod 177 and the scraper 178 also has a stirring effect, so that the waste liquid and waste residue fall into the inside of the collection box 16 below more quickly, and when the pressing plate 171 has no driving force, the bottom of the twisted rod 172 is connected to the inner wall of the long block 173 through the spring 174, so that the twisted rod 172 and the spring 174 constitute a telescopic reset structure, so that the twisted rod 172 rotates in the opposite direction to reset, and again drives the scraper 178 to clean and dredge the pipe wall, the bottom of the long block 173 is connected to the fixed rod 176 through the bearing 175, and the top of the fixed rod 176 is provided with a sliding block sliding in the sliding groove in the pipe wall, achieving the effect of cleaning and dredging, and the contents not described in detail in the specification belong to the prior art known to those skilled in the art.

[0048] Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can make modifications to the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to part of the technical features, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A multi-stage evaporation treatment apparatus for wastewater treatment, comprising an apparatus main body (1), characterized by: The left end of the equipment body (1) is provided with a wastewater bucket (2), and the surface of the wastewater bucket (2) is provided with a liquid inlet pipe (3); the right upper corner of the equipment body (1) is provided with a steam outlet pipe (7), and the lower portion of the steam outlet pipe (7) is provided with a condenser (8); the outer portion of the water pipe connected with the condenser (8) is provided with a vacuum pump (10); the left end lower portion of the condenser (8) is provided with a condensate water tank (11), and the right end of the condensate water tank (11) is provided with a purification system (12) through a water pipe; the equipment body (1) is provided with a mist eliminator (4), and the lower portion of the mist eliminator (4) is provided with a filter plate (6); the lower portion of the filter plate (6) is provided with a dredging mechanism (13), and the lower portion of the dredging mechanism (13) is provided with a waste residue discharge pipe (15); the inside of the waste residue discharge pipe (15) is provided with an anti-blocking mechanism (17), and the lower portion of the anti-blocking mechanism (17) is provided with a collection tank (16). The anti-blocking mechanism (17) comprises a pressing plate (171), and the upper portion of the pressing plate (171) is provided with a pushing plate (14); the surface of the pushing plate (14) is arc-shaped, and the top surface of the pressing plate (171) is arc-shaped; the top portion of the pressing plate (171) protrudes from the top portion of the waste residue discharge pipe (15), and the top portion of the pressing plate (171) is in arc correspondence with the top portion of the pushing plate (14); and the top portion of the pressing plate (171) is in contact with the top portion of the pushing plate (14). The anti-blocking mechanism (17) further comprises a twisted rod (172), a spring (174) and a long block (173); the bottom portion of the pressing plate (171) is provided with the twisted rod (172); one end of the spring (174) is connected to the bottom portion of the twisted rod (172); and the other end of the spring (174) is connected to the inner wall of the long block (173); and the twisted rod (172) and the spring (174) form a telescopic reset structure. The anti-blocking mechanism (17) further comprises a bearing, a long rod (177) and a scraper (178); the twisted rod (172) and the twisted groove in the long block (173) are threadedly connected and rotatable; the outer portion of the long block (173) is provided with a bearing, and the outer portion of the bearing is provided with the long rod (177); the top portion of the long rod (177) is provided with the scraper (178); the scraper (178) is in contact with the inner wall of the waste residue discharge pipe; the bottom end outer portion of the long block (173) is provided with a bearing, and the outer portion of the bearing is provided with a fixing rod (176); the top portion of the fixing rod (176) is provided with a sliding block, and the sliding block is located in the sliding groove in the inner wall of the waste residue discharge pipe (15); and the sliding block and the sliding groove form a sliding structure. The dredging mechanism (13) comprises a motor (131), a rotating rod (132) and a rotating disc (133), the top of the motor (131) is provided with the rotating rod (132), the outer portion of the rotating rod (132) is provided with the rotating disc (133), the longitudinal section of the rotating disc (133) is trapezoidal, the top of the rotating disc (133) is of an irregular undulating structure, and the rotating plate (14) is located outside the rotating rod (132), so that the rotating rod (132) can drive the rotating plate (14) to rotate.

2. The multi-stage evaporation treatment apparatus for wastewater treatment according to claim 1, characterized by: The dredging mechanism (13) further comprises a vertical rod (135) and a connecting rod (134), the upper portion of the rotating disc (133) is provided with the vertical rod (135), the outer portion of the vertical rod (135) is provided with the connecting rod (134), the connecting rod (134) is fixedly connected with the rotating rod (132), the bottom of the vertical rod (135) is conical, and the bottom of the vertical rod (135) is in contact with the top of the rotating disc (133).

3. The multi-stage evaporation treatment apparatus for wastewater treatment according to claim 2, characterized by: The dredging mechanism (13) further comprises a belt (137) and a dredging brush (138), the top end of the rotating rod (132) protrudes into the inside of the rotating disc (133), the surface of the rotating rod (132) is sleeved with the belt (137), the other end of the belt (137) is sleeved with the surface of the dredging brush (138), the belt (137) is provided with a plurality of groups, and the plurality of groups of belts (137) are sequentially sleeved with the outer portion of the dredging brush (138).

4. The multi-stage evaporation treatment apparatus for wastewater treatment according to claim 3, characterized by: The dredging brush (138) is provided with a plurality of groups, the plurality of groups of dredging brushes (138) are distributed at equal intervals, the bottom of the plurality of groups of dredging brushes (138) is connected with the surface of the rotating disc (133) through bearings, the surface of the dredging brush (138) is provided with bristles, the bristles are in contact with the inner wall of the filter hole of the filter plate (6) when moving upwards, and the dredging brush (138) and the filter hole of the filter plate (6) are in corresponding positions.

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