A mobile sludge solid waste treatment device

Abstract

This utility model discloses a mobile sludge solid waste treatment device, belonging to the field of sludge treatment technology. It includes a vehicle body and a carrier plate, with a control box fixedly connected to the top surface of the carrier plate. A cleaning mechanism is provided on the top surface of the carrier plate, comprising a cleaning box, a first filter frame, a second filter frame, a coarse filter screen, and a fine filter screen. The cleaning box is fixedly connected to the top surface of the carrier plate, and the first and second filter frames are also fixedly connected inside the cleaning box. The coarse and fine filter screens are fixedly connected inside the frames of the first and second filter frames, respectively. A stirring mechanism is provided on the right side of the cleaning box. Equipped with a vehicle body, it can be flexibly moved to different sites, whether remote areas or temporary sludge treatment sites, enabling timely arrival and operation. This effectively solves the problem that fixed treatment equipment cannot flexibly cope with different sites and emergencies, greatly improving the timeliness and coverage of sludge treatment.

Description

Technical Field

[0001] This utility model relates to the field of sludge treatment technology, and in particular to a mobile sludge solid waste treatment device. Background Technology

[0002] Sludge solid waste treatment refers to the process of reducing the volume of solid waste such as sludge generated during sewage treatment and industrial production using various physical, chemical, and biological technologies. This includes reducing the volume (e.g., dewatering to lower the water content, volume, and weight for easier transportation and disposal), stabilizing the sludge's physical and chemical properties to prevent further decay or the production of harmful substances (e.g., anaerobic digestion to decompose organic matter into stable gases like methane and carbon dioxide under anaerobic conditions), eliminating or reducing the harmful effects of pathogens, heavy metals, and toxic organic pollutants on the environment and human health (e.g., chemical stabilization to convert heavy metals into insoluble forms, reducing their bioavailability and mobility), and ultimately transforming the treated sludge into a safe and usable form for disposal, such as fertilizer for soil improvement, building materials, or sanitary landfill, to prevent pollution of soil, water, and air.

[0003] While some sludge solid waste treatment technologies and equipment exist in the current field, most have limitations. Some treatment equipment is bulky, fixed in place, and cannot be moved flexibly, making it difficult to adapt to sludge treatment needs in different locations and under unexpected circumstances. For example, in some remote areas or temporary sludge treatment sites, fixed treatment equipment cannot arrive and begin work in a timely manner. Furthermore, existing treatment processes and equipment have low integration levels, often requiring multiple decentralized devices and complex operating steps to complete sludge removal, mixing, and chemical dosing, resulting in low treatment efficiency, cumbersome operation, and increased treatment costs and manpower. Utility Model Content

[0004] The main objective of this invention is to provide a mobile sludge solid waste treatment device that can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A mobile sludge solid waste treatment device includes a vehicle body and a carrier plate. A control box is fixedly connected to the top surface of the carrier plate. A cleaning mechanism is provided on the top surface of the carrier plate, comprising a cleaning box, a first filter frame, a second filter frame, a coarse filter screen, and a fine filter screen. The cleaning box is fixedly connected to the top surface of the carrier plate, and the first and second filter frames are also fixedly connected inside the cleaning box. The coarse filter screen and the fine filter screen are respectively fixedly connected inside the first and second filter frames. A stirring mechanism is provided on the right side of the cleaning box. The mechanism includes a mixing tank, a mixing motor, a mixing shaft, and mixing blades. The mixing tank is fixedly connected to the top surface of the carrier plate, and the mixing motor is fixedly connected to the top surface of the mixing tank. The mixing shaft is connected to the output end of the mixing motor, and several mixing blades are fixedly connected to the outer wall of the mixing shaft. A dosing mechanism is also provided on the right side of the mixing tank, and the dosing mechanism includes a dosing tank, a suction pipe, and a metering pump. The dosing tank is connected to a connecting branch pipe on the suction pipe through a control valve, and the suction pipe is connected to the input end of the metering pump.

[0007] As a further preferred embodiment of this technical solution, the impurity removal box is fixedly installed on the top left side of the carrier plate, and a first sewage inlet is fixedly installed on the top surface of the impurity removal box. A first sewage outlet is fixedly installed on the right side wall of the impurity removal box, and a set of symmetrical cleaning ports are also provided on the front wall of the impurity removal box.

[0008] As a further preferred embodiment of this technical solution, a first sludge pump is fixedly installed on the top surface of the carrier plate and on the left side of the impurity removal box, and a first connecting pipe is fixedly installed between the output end of the first sludge pump and the first sludge inlet. A second sludge pump is also fixedly installed on the top surface of the carrier plate and on the right side of the impurity removal box, and the input end of the second sludge pump is fixedly installed together with the first sludge outlet. A second connecting pipe is also fixedly installed on the output end of the second sludge pump. The first filter frame and the second filter frame are inserted into the cleaning port from top to bottom, and handles are fixedly installed on the front end walls of the first filter frame and the second filter frame, respectively. A coarse filter screen and a fine filter screen are fixedly installed in sequence inside the frames of the first filter frame and the second filter frame.

[0009] As a further preferred embodiment of this technical solution, the mixing tank is fixedly installed on the top surface of the carrier plate, and a second sewage inlet is fixedly installed on the top of the left side wall of the mixing tank, a second sewage outlet is fixedly installed on the bottom of the left side wall of the mixing tank, and a medicine inlet is fixedly installed on the top of the right side wall of the mixing tank. A sewage pump is also fixedly installed on the top surface of the carrier plate and on the left side of the mixing tank, and the input end of the sewage pump is fixedly installed together with the second sewage outlet. The mixing motor is fixedly installed on the top surface of the mixing tank, and a mixing shaft is fixedly installed on the output end of the mixing motor. Several mixing blades are fixedly installed on the outer wall of the mixing shaft.

[0010] As a further preferred embodiment of this technical solution, several dosing tanks for storing different reagents are also fixedly installed on the top surface of the carrier plate, located on the right side of the mixing tank.

[0011] As a further preferred embodiment of this technical solution, a discharge port is fixedly installed on the bottom surface of the dosing tank, a connecting branch pipe corresponding to the discharge port is fixedly installed on the outer wall of the suction pipe, and a control valve is fixedly installed between the connecting branch pipe and the discharge port. A metering pump is also fixedly installed on the top surface of the carrier plate and on the right side of the mixing tank, and the suction pipe is fixedly installed together with the input end of the metering pump. A delivery pipe is also fixedly installed between the output end of the metering pump and the inlet.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] In this utility model, by being equipped with a vehicle body, it can be flexibly moved to different sites. Whether it is a remote area or a temporary sludge treatment site, it can arrive in time and start work. This effectively solves the problem that fixed treatment equipment cannot flexibly cope with different sites and emergencies, and greatly improves the timeliness and coverage of sludge treatment.

[0014] The impurity removal mechanism, mixing mechanism and dosing mechanism are integrated on the carrier plate to form an integrated treatment system. In the sludge treatment process, from impurity removal to mixing to dosing, there is no need for multiple separate devices to cooperate, which reduces the transfer and connection links between devices, makes the operation process simpler, reduces the operation difficulty and manpower input, and improves the treatment efficiency.

[0015] The impurity removal mechanism adopts a double-layer filter frame design. The first filter frame contains a coarse filter screen, and the second filter frame contains a fine filter screen. This allows for graded filtration of sludge, effectively removing larger and smaller solid impurities from the sludge, improving the purity of the sludge, providing better conditions for subsequent mixing and chemical dosing, and contributing to improved overall treatment efficiency.

[0016] The mixing mechanism drives the mixing shaft and mixing blades to rotate through the mixing motor, which fully mixes the sludge entering the mixing box. This mixing method can fully mix the sludge with the subsequently added agents, ensure that the agents are evenly dispersed in the sludge, improve the reaction efficiency between the agents and the sludge, enhance the effect of sludge treatment, and help to achieve the stabilization and harmlessness of sludge.

[0017] The dosing system is equipped with multiple dosing tanks storing different chemicals. In actual treatment, sludge from different sources and with varying properties contains significantly different types and amounts of pollutants, requiring the targeted addition of different types and proportions of chemicals. Control valves manage the connection between each dosing tank and the extraction pipe, allowing operators to flexibly select and combine the necessary chemicals based on the specific composition of the sludge. Simultaneously, a metering pump precisely controls the amount of chemicals added, ensuring that the chemicals are accurately added to the mixing tank according to the set proportions. This avoids problems of over- or under-addition, improving the accuracy and controllability of dosing, reducing chemical waste and the risk of poor treatment results due to improper chemical addition. This system better meets the diverse sludge treatment needs and enhances treatment effectiveness. Attached Figure Description

[0018] Figure 1 This is a front view schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 3 This is a structural breakdown diagram of the impurity removal mechanism of this utility model;

[0021] Figure 4 This is a cross-sectional schematic diagram of the stirring mechanism of this utility model;

[0022] Figure 5 This is a schematic diagram of the overall structure of the drug dispensing mechanism of this utility model.

[0023] In the diagram: 1. Vehicle body; 2. Carrier plate; 3. Control box; 4. Impurity removal mechanism; 5. Mixing mechanism; 6. Dosing mechanism; 7. Impurity removal box; 8. First sewage inlet; 9. First sewage outlet; 10. Cleaning port; 11. First sewage pump; 12. First connecting pipe; 13. Second sewage pump; 14. Second connecting pipe; 15. First filter frame; 16. Second filter frame; 17. Handle; 18. Coarse filter screen; 19. Fine filter screen; 20. Mixing box; 21. Second sewage inlet; 22. Second sewage outlet; 23. Chemical inlet; 24. Sewage pump; 25. Mixing motor; 26. Mixing shaft; 27. Mixing blades; 28. Dosing box; 29. ​​Discharge port; 30. Control valve; 31. Chemical extraction pipe; 32. Connecting branch pipe; 33. Metering pump; 34. Delivery pipe. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0025] like Figures 1-5 As shown, a mobile sludge solid waste treatment device includes a vehicle body 1 and a carrier plate 2. A control box 3 is fixedly connected to the top surface of the carrier plate 2, and the entire sludge solid waste treatment device can be controlled through the control box 3. A cleaning mechanism 4 is provided on the top surface of the carrier plate 2, and the cleaning mechanism 4 includes a cleaning box 7, a first filter frame 15, a second filter frame 16, a coarse filter screen 18, and a fine filter screen 19. The cleaning box 7 is fixedly connected to the top surface of the carrier plate 2, and the first filter frame 15 and the second filter frame 16 are also fixedly connected inside the cleaning box 7. The coarse filter screen 18 and the fine filter screen 19 are respectively fixedly connected inside the frames of the first filter frame 15 and the second filter frame 16. A stirring device is provided on the right side of the cleaning box 7. The mixing mechanism 5 includes a mixing tank 20, a mixing motor 25, a mixing shaft 26, and mixing blades 27. The mixing tank 20 is fixedly connected to the top surface of the carrier plate 2, and the mixing motor 25 is fixedly connected to the top surface of the mixing tank 20. The mixing shaft 26 is connected to the output end of the mixing motor 25, and several mixing blades 27 are fixedly connected to the outer wall of the mixing shaft 26. A dosing mechanism 6 is also provided on the right side of the mixing tank 20. The dosing mechanism 6 includes a dosing tank 28, a suction pipe 31, and a metering pump 33. The dosing tank 28 is connected to the connecting branch pipe 32 on the suction pipe 31 through a control valve 30, and the suction pipe 31 is connected to the input end of the metering pump 33.

[0026] like Figures 2-3 As shown, a waste removal box 7 is fixedly installed on the top left side of the carrier plate 2, and a first waste inlet 8 is fixedly installed on the top surface of the waste removal box 7. A first waste outlet 9 is fixedly installed on the right side wall of the waste removal box 7, and a set of symmetrical cleaning ports 10 are also provided on the front wall of the waste removal box 7. A first sludge pump 11 is fixedly installed on the top surface of the carrier plate 2 and on the left side of the waste removal box 7, and a first connecting pipe 12 is fixedly installed between the output end of the first sludge pump 11 and the first waste inlet 8. A second sludge pump 13 is also fixedly installed on the top surface of the carrier plate 2 and on the right side of the waste removal box 7, and the input end of the second sludge pump 13 is fixedly installed together with the first waste outlet 9. A second connecting pipe 14 is also fixedly installed on the output end of the second sludge pump 13. The first filter... The first filter frame 15 and the second filter frame 16 are inserted into the cleaning port 10 from top to bottom. Handles 17 are fixedly installed on the front wall of the first filter frame 15 and the second filter frame 16 respectively. Coarse filter screen 18 and fine filter screen 19 are fixedly installed in the frame of the first filter frame 15 and the second filter frame 16 respectively. Through the graded filtration of coarse filter screen 18 and fine filter screen 19, impurities of different particle sizes in sludge can be effectively removed, the purity of sludge can be improved, and good conditions can be provided for subsequent mixing and chemical treatment. This helps to improve the overall sludge treatment effect. At the same time, the design of the cleaning port 10 and the handle 17 makes it convenient to clean and maintain the first filter frame 15 and the second filter frame 16, prevents the filter screen from clogging, ensures the normal operation of the impurity removal mechanism, and reduces the equipment maintenance cost and difficulty.

[0027] like Figure 2 and Figure 4 As shown, the mixing tank 20 is fixedly installed on the top surface of the carrier plate 2, and a second sewage inlet 21 is fixedly installed on the top of the left side wall of the mixing tank 20, a second sewage outlet 22 is fixedly installed on the bottom of the left side wall of the mixing tank 20, and a medicine inlet 23 is fixedly installed on the top of the right side wall of the mixing tank 20. A sewage pump 24 is also fixedly installed on the top surface of the carrier plate 2 and on the left side of the mixing tank 20, and the input end of the sewage pump 24 is fixedly installed together with the second sewage outlet 22. The mixing motor 25 is fixedly installed on the top surface of the mixing tank 20, and a mixing device is fixedly installed on the output end of the mixing motor 25. The outer wall of the mixing shaft 26 is fixedly equipped with several mixing blades 27. When the sludge and the agent enter the mixing box 20, the mixing motor 25 drives the mixing shaft 26 and the mixing blades 27 to rotate, so as to fully mix the sludge and the agent, promote the chemical reaction, improve the reaction efficiency between the agent and the sludge, enhance the sludge treatment effect, and help to achieve sludge stabilization and harmlessness. Through full mixing, it can be ensured that the agent is evenly dispersed in the sludge, avoid local agent concentrations that are too high or too low, and ensure the consistency and stability of the treatment effect.

[0028] like Figure 2 and Figure 5 As shown, several dosing tanks 28 for storing different reagents are fixedly installed on the top surface of the carrier plate 2 and on the right side of the mixing tank 20. A discharge port 29 is fixedly installed on the bottom surface of each dosing tank 28. A connecting branch pipe 32 corresponding to the discharge port 29 is fixedly installed on the outer wall of the suction pipe 31, and a control valve 30 is fixedly installed between the connecting branch pipe 32 and the discharge port 29. A metering pump 33 is also fixedly installed on the top surface of the carrier plate 2 and on the right side of the mixing tank 20, and the suction pipe 31 is fixedly installed together with the input end of the metering pump 33. A fixed connection is also established between the output end of the metering pump 33 and the inlet 23. Equipped with a delivery pipe 34, the design of multiple dosing tanks 28 can store different types of chemicals to meet the treatment needs of different sludge compositions, improving the applicability and flexibility of the device. The control valve 30 can achieve independent control of each dosing tank 28, making it convenient to select the chemical combination according to the actual situation. The metering pump 33 can accurately control the amount of chemicals added, ensuring that the chemicals are accurately added to the mixing tank 20 according to the set ratio, avoiding excessive or insufficient addition of chemicals, reducing the risk of chemical waste and poor treatment effect due to improper addition of chemicals, and improving the accuracy and economy of sludge treatment.

[0029] The specific treatment process and principle of this mobile sludge solid waste treatment device are as follows:

[0030] The mobile sludge solid waste treatment device is moved to the sludge treatment site using vehicle body 1. The pipe for sludge extraction is connected to the input end of the first sludge pump 11. The first sludge pump 11, located on the left side of the impurity removal box 7 on the carrier plate 2, is started. The first sludge pump 11 begins to work, sucking up the sludge to be treated and transporting it through the first connecting pipe 12 to the first inlet 8 on the top surface of the impurity removal box 7. The sludge enters the impurity removal box 7 and flows sequentially through the first filter frame 15 and the second filter frame 16 inserted into the cleaning port 10 under the action of gravity. The coarse filter screen 18 in the first filter frame 15 first plays its role, performing preliminary filtration of the sludge and intercepting larger solid impurities in the sludge. Subsequently, the sludge passes through the fine filter screen 19 in the second filter frame 16, which further filters and removes smaller solid impurities in the sludge. Through this graded impurity removal method, the purity of the sludge is effectively improved. The sludge after impurity removal... The sludge accumulates at the bottom of the impurity removal box 7. At this time, the second sludge pump 13 located on the right side of the impurity removal box 7 is started. The second sludge pump 13, through its connection with the first discharge port 9, extracts the sludge after impurity removal and transports it from the second inlet port 21 through the second connecting pipe 14 to the subsequent mixing box 20. Then, according to the specific composition of the sludge to be treated, the operator controls the control valve 30 installed between the connecting branch pipe 32 corresponding to the discharge port 29 and the discharge port 29 through the control box 3. The appropriate dosing tank 28 is selected and connected to the extraction pipe 31. The metering pump 33 is started. The metering pump 33 starts working and extracts the agent in the selected dosing tank 28 through the extraction pipe 31 and then transports it through the conveying pipe 34 to the inlet port 23 at the top of the right side wall of the mixing box 20. The agent enters the interior of the mixing box 20 from there. The metering pump 33 can accurately control the amount of agent added to ensure that the agent is accurately added to the mixing box 20 according to the set ratio, avoiding the impact on the treatment effect due to excessive or insufficient agent addition.

[0031] After the sludge and chemicals enter the mixing tank 20, the stirring motor 25, which is fixedly installed on the top surface of the mixing tank 20, is started. The stirring motor 25 drives the stirring shaft 26, which is fixedly installed at the output end, to start rotating. Several stirring blades 27, which are fixedly installed on the outer wall of the stirring shaft 26, also rotate at high speed. The stirring blades 27 thoroughly stir the sludge and chemicals in the mixing tank 20, so that the two can be fully mixed, accelerate the chemical reaction, increase the reaction rate between the chemicals and the sludge, enhance the effect of sludge treatment, and promote the sludge towards stabilization and harmlessness.

[0032] After being stirred and treated with chemicals, the sludge accumulates at the bottom of the mixing tank 20. At this time, the sewage pump 24 located on the left side of the mixing tank 20 is started. The sewage pump 24 is connected to the second sewage outlet 22 to extract the treated sludge and discharge it through the sewage pipe pre-connected to the output end of the sewage pump 24 for subsequent treatment or safe discharge.

[0033] When the filter screens in the first filter frame 15 and the second filter frame 16 need to be cleaned due to the accumulation of impurities, the operator only needs to hold the handle 17 on the front wall and pull the first filter frame 15 and the second filter frame 16 out of the cleaning port 10 to clean the coarse filter screen 18 and the fine filter screen 19, prevent the filter screen from clogging, and ensure that the impurity removal mechanism 4 can continue to operate normally.

[0034] Through the above-mentioned continuous processing flow, this mobile sludge solid waste treatment device can efficiently complete the treatment of sludge solid waste due to its advantages such as flexible mobility, high treatment efficiency, and precise dosing. It can effectively meet the sludge treatment needs of different sites and in case of emergencies, and provide strong support for environmental protection and rational utilization of resources.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mobile sludge solid waste treatment device, comprising a vehicle body (1) and a carrier plate (2), wherein a control box (3) is fixedly connected to the top surface of the carrier plate (2), characterized in that: The top surface of the carrier plate (2) is provided with a cleaning mechanism (4), and the cleaning mechanism (4) includes a cleaning box (7), a first filter frame (15), a second filter frame (16), a coarse filter screen (18), and a fine filter screen (19). The cleaning box (7) is fixedly connected to the top surface of the carrier plate (2), and the first filter frame (15) and the second filter frame (16) are also fixedly connected inside the cleaning box (7). The coarse filter screen (18) and the fine filter screen (19) are fixedly connected inside the first filter frame (15) and the second filter frame (16), respectively. The right side of the cleaning box (7) is provided with a stirring mechanism (5), and the stirring mechanism (5) includes a stirring box (20), a stirring motor (25), a stirring shaft (26), and a stirring agitator. The mixing blades (27), the mixing box (20) is fixedly connected to the top surface of the carrier plate (2), and the mixing motor (25) is fixedly connected to the top surface of the mixing box (20). The mixing shaft (26) is connected to the output end of the mixing motor (25), and several mixing blades (27) are fixedly connected to the outer wall of the mixing shaft (26). The right side of the mixing box (20) is also provided with a dosing mechanism (6), and the dosing mechanism (6) includes a dosing tank (28), a suction pipe (31) and a metering pump (33). The dosing tank (28) is connected to the connecting branch pipe (32) on the suction pipe (31) through a control valve (30), and the suction pipe (31) is connected to the input end of the metering pump (33).

2. A mobile sludge and solid waste treatment apparatus according to claim 1, wherein: The impurity removal box (7) is fixedly installed on the left side of the top surface of the carrier plate (2), and the top surface of the impurity removal box (7) is fixedly installed with a first sewage inlet (8), the right side wall of the impurity removal box (7) is fixedly installed with a first sewage outlet (9), and a set of symmetrical cleaning ports (10) are also opened on the front wall of the impurity removal box (7).

3. A mobile sludge and solid waste treatment apparatus according to claim 2, wherein: A first sludge pump (11) is fixedly installed on the top surface of the carrier plate (2) and on the left side of the impurity removal box (7). A first connecting pipe (12) is fixedly installed between the output end of the first sludge pump (11) and the first sludge inlet (8). A second sludge pump (13) is also fixedly installed on the top surface of the carrier plate (2) and on the right side of the impurity removal box (7). The input end of the second sludge pump (13) is fixedly installed together with the first sludge outlet (9). A second connecting pipe (14) is also fixedly installed on the output end of the second sludge pump (13). The first filter frame (15) and the second filter frame (16) are inserted into the cleaning port (10) from top to bottom. A handle (17) is fixedly installed on the front wall of the first filter frame (15) and the second filter frame (16). A coarse filter screen (18) and a fine filter screen (19) are fixedly installed in sequence inside the frame of the first filter frame (15) and the second filter frame (16).

4. A mobile sludge and solid waste treatment apparatus according to claim 3, wherein: The mixing tank (20) is fixedly installed on the top surface of the carrier plate (2), and a second sewage inlet (21) is fixedly installed on the top of the left side wall of the mixing tank (20). A second sewage outlet (22) is fixedly installed on the bottom of the left side wall of the mixing tank (20), and a medicine inlet (23) is fixedly installed on the top of the right side wall of the mixing tank (20). A sewage pump (24) is also fixedly installed on the top surface of the carrier plate (2) and on the left side of the mixing tank (20). The input end of the sewage pump (24) is fixedly installed together with the second sewage outlet (22). The stirring motor (25) is fixedly installed on the top surface of the mixing tank (20), and a stirring shaft (26) is fixedly installed on the output end of the stirring motor (25). Several stirring blades (27) are fixedly installed on the outer wall of the stirring shaft (26).

5. A mobile sludge and solid waste treatment apparatus according to claim 4, wherein: Several dosing tanks (28) for storing different agents are also fixedly installed on the top surface of the carrier plate (2) and on the right side of the mixing tank (20).

6. A mobile sludge and solid waste treatment apparatus according to claim 5, wherein: The bottom surface of the dosing tank (28) is fixedly equipped with a discharge port (29). The outer wall of the suction pipe (31) is fixedly equipped with a connecting branch pipe (32) corresponding to the discharge port (29). A control valve (30) is fixedly installed between the connecting branch pipe (32) and the discharge port (29). A metering pump (33) is also fixedly installed on the top surface of the carrier plate (2) and on the right side of the mixing tank (20). The suction pipe (31) and the input end of the metering pump (33) are fixedly installed together. A delivery pipe (34) is also fixedly installed between the output end of the metering pump (33) and the inlet (23).

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