Municipal pipeline flushing and discharging water quality monitoring device

Abstract

The utility model discloses a municipal pipeline flushing and discharging water quality monitoring device. The device comprises a box body, a secondary pressure reducing valve arranged in the box body, a turbidity detection flow path system, a residual chlorine detection flow path system and a wastewater tank, the turbidity detection flow path system and the residual chlorine detection flow path system are respectively connected with two water outlets of the secondary pressure reducing valve, and a water inlet of the secondary pressure reducing valve is connected with a pipeline to be detected. According to the invention, the workload of manual sampling and detection of pipeline flushing water is reduced, the situation of water splashing during sampling can be avoided, the water quality in the flushing process can be continuously monitored, the situation that flushing is stopped when the flushing requirement is not met or flushing is still continued when flushing is qualified due to an accidental water quality result is avoided, and the water quality change situation in the flushing process can be preserved; and subsequent analysis and processing are facilitated, and a more targeted pipeline maintenance plan is made.

Description

Technical Field

[0001] The present invention relates to the technical field of municipal pipeline flushing and discharge operation and water quality monitoring devices, and in particular to a municipal pipeline flushing and discharge water quality monitoring device. Background Art

[0002] Pipe flushing is a crucial measure to ensure pipeline water quality. According to national and local standards, pipeline flushing must be performed before grid connection, after water outages, and when water quality is abnormal. Fire hydrants must also be drained quarterly for pipeline flushing. Specific requirements are shown in Table 1. During pipeline flushing, water quality must be tested promptly. Based on the test results, it can be determined whether the requirements are met and the flushing operation can be stopped.

[0003] Table 1 Pipeline flushing related standards

[0004]

[0005]

[0006] The current process for testing pipe flushing water quality is as follows: Manual sampling is performed after the flushing water is observed to be relatively clear. On-site testing is conducted periodically using portable instruments for turbidity and free chlorine. If the water fails to meet the standards, flushing continues until the test results meet the requirements. For scenarios requiring additional testing, sampling is then sent to a testing agency. While regular flushing from fire hydrants generally requires only 10 minutes, flushing after a water outage or in the event of water quality abnormalities can take up to several hours.

[0007] The current flushing water quality testing scheme has the following defects:

[0008] 1. Inconvenient operation

[0009] After the water is clear as observed with the naked eye, it is often necessary to continue adding water to meet the requirements, so multiple sampling and testing are required; at the same time, due to the fast water flow rate and small capacity of the test bottle, there will be a large degree of splashing during sampling, which poses certain difficulties and risks.

[0010] 2. Flushing effect is difficult to guarantee

[0011] There is a certain degree of randomness in water quality, and sampling once or twice is difficult to ensure that the piped water quality has continued to stably meet the requirements.

[0012] 3. May cause waste

[0013] Because sampling and testing are not done frequently, there may be situations where water quality is acceptable but it is still discharged, resulting in water waste. If the total flushing time exceeds 1 hour, the waste may be more obvious.

[0014] 4. The process is difficult to trace, and requires high awareness of personnel

[0015] Because the water quality during the flushing process is difficult to trace, if the personnel are not self-conscious, flushing may be stopped if the water quality does not meet the standards.

[0016] 5. It is difficult to record changes in water quality during the flushing process

[0017] Since only a limited number of water quality samples and manual tests are performed during the flushing process, it is difficult to fully record the changes in water quality throughout the flushing process, resulting in data loss. Summary of the Invention

[0018] The main purpose of the present invention is to propose a municipal pipeline flushing discharge water quality monitoring device, which aims to reduce the workload of manual sampling and testing of discharge water during pipeline flushing, avoid water splashing during sampling, and continuously monitor the water quality of the flushing process to avoid accidental water quality results that lead to stopping flushing when flushing requirements are not met or continuing flushing when the flushing is qualified. In addition, the water quality changes during the flushing process can be saved to facilitate subsequent analysis and processing and the formulation of more targeted pipeline maintenance plans.

[0019] To achieve the above-mentioned object, the present invention provides a municipal pipeline flushing discharge water quality monitoring device, comprising: a box body, a secondary pressure reducing valve, a turbidity detection flow path system, a residual chlorine detection flow path system and a wastewater tank arranged in the box body;

[0020] The turbidity detection flow path system and the residual chlorine detection flow path system are respectively connected to the two water outlets of the secondary pressure reducing valve, and the water inlet of the secondary pressure reducing valve is connected to the pipeline to be detected.

[0021] The turbidity detection flow path system includes a turbidity detection module, a turbidity detection water inlet pipeline, a turbidity detection drainage pipeline and a turbidity detection overflow pipeline. One end of the turbidity detection water inlet pipeline is connected to one end of the secondary pressure reducing valve, and the other end of the turbidity detection water inlet pipeline is connected to the water inlet of the turbidity detection module. A flow meter A is provided on the turbidity detection water inlet pipeline. One end of the turbidity detection drainage pipeline is connected to the drainage outlet of the turbidity detection module, and the other end is connected to the wastewater tank. A turbidity drainage ball valve is provided on the turbidity detection drainage pipeline. One end of the turbidity detection overflow pipeline is connected to the overflow outlet of the turbidity detection module, and the other end is connected to the wastewater tank.

[0022] The residual chlorine detection flow path system includes a residual chlorine detection module, a residual chlorine detection water inlet pipeline, a residual chlorine detection drainage pipeline and a residual chlorine detection overflow pipeline. One end of the residual chlorine detection water inlet pipeline is connected to one end of the secondary pressure reducing valve, and the other end of the residual chlorine detection water inlet pipeline is connected to the water inlet of the residual chlorine detection module. A flow meter B is provided on the residual chlorine detection water inlet pipeline, one end of the residual chlorine detection drainage pipeline is connected to the drainage outlet of the residual chlorine detection module, and the other end is connected to the wastewater tank. A residual chlorine drainage ball valve is provided on the residual chlorine detection drainage pipeline, one end of the residual chlorine detection overflow pipeline is connected to the overflow outlet of the residual chlorine detection module, and the other end is connected to the wastewater tank.

[0023] A further technical solution of the present invention is that the wastewater tank is connected to an external drainage pipeline.

[0024] A further technical solution of the present invention is that a display component, a power module, a data storage device and a mainboard controller are provided in the box, and the display component, the power module and the data storage device are respectively connected to the mainboard controller.

[0025] A further technical solution of the present invention is that the display component includes a display screen, a signal light and a switch, and the display screen, the signal light and the switch are respectively connected to the mainboard controller.

[0026] A further technical solution of the present invention is that a water inlet and a water outlet are provided at the bottom of the box body, the water outlet is connected to the external drainage pipeline, and the water inlet is connected to an external fire hydrant.

[0027] A further technical solution of the present invention is that the water inlet is connected to the pipeline to be tested through a water inlet pipe. When performing water quality monitoring, the pipeline to be tested is connected to a tee. One end of the water inlet pipe is connected to the secondary pressure reducing valve, and the other end is connected to one end of the tee. A manual ball valve and a pressure reducing valve with a pressure gauge are provided on the water inlet pipe.

[0028] A further technical solution of the present invention is that a telescopic rod and a lifting handle are provided on the top of the outer box, universal wheels and supporting feet are provided on the bottom, and a back panel is provided on the rear side of the outer box.

[0029] A further technical solution of the present invention is that both the turbidity detection module and the residual chlorine detection module adopt electrode method for detection.

[0030] A further technical solution of the present invention is that the detection range of the turbidity detection module is 0-100NTU, the detection error is ±2% or 0.01NTU, whichever is greater; the detection range of the residual chlorine detection module is 0-2mg / L, the detection error is ±5% or 0.03mg / L, whichever is greater.

[0031] The beneficial effects of the municipal pipeline flushing discharge water quality monitoring device of the present invention are:

[0032] The present invention uses online monitoring means to replace manual sampling and detection. When in use, the detection device is connected to the fire hydrant through a tee, so that the municipal pipeline flushing discharge water enters the flow system of the device through the fire hydrant, and the turbidity and free chlorine are detected by the turbidity detection module and the residual chlorine detection module. At the same time, the test results are output and it is judged whether the flushing requirements are met, and the user is prompted whether the flushing can be ended. The workload of manual sampling and testing is reduced, and water splashing during sampling is avoided. At the same time, the water quality of the flushing process can be continuously monitored to avoid the situation where accidental water quality results lead to stopping flushing because the flushing requirements are not met or continuing flushing after the flushing is qualified. In addition, the water quality changes during the flushing process can be saved, which is convenient for subsequent analysis and processing and the formulation of a more targeted pipeline maintenance plan. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0034] Figure 1 This is a flow diagram of a preferred embodiment of the municipal pipeline flushing and discharge water quality monitoring device of the present invention;

[0035] Figure 2 This is a schematic diagram of the internal structure of a preferred embodiment of the municipal pipeline flushing and discharge water quality monitoring device of the present invention;

[0036] Figure 3 This is a schematic diagram of the overall structure of a preferred embodiment of the municipal pipeline flushing and discharge water quality monitoring device of the present invention;

[0037] Figure 4 This is a schematic diagram of the overall structure of a preferred embodiment of the municipal pipeline flushing and discharge water quality monitoring device of the present invention from another angle;

[0038] Figure 5 It is a schematic diagram of the use status of a preferred embodiment of the municipal pipeline flushing and discharge water quality monitoring device of the present invention.

[0039] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments.

[0040] Description of Figure Numbers:

[0041] Box body 1; secondary pressure reducing valve 2; wastewater tank 3; turbidity detection module 4; turbidity detection water inlet pipeline 5; turbidity detection overflow pipeline 6; turbidity drainage ball valve 7; residual chlorine detection module 8; residual chlorine detection water inlet pipeline 9; residual chlorine detection overflow pipeline 10; residual chlorine drainage ball valve 11; power module 12; mainboard controller 13; display screen 14; signal light 15; switch 16; tee 17; manual ball valve 18; pressure reducing valve 19; telescopic rod 20; lifting handle 21; universal wheel 22; support leg 23; back panel 24; water inlet 25; water outlet 26; fire hydrant 27. DETAILED DESCRIPTION

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0043] The present invention proposes a municipal pipeline flushing and discharge water quality monitoring device. The present invention uses online monitoring means to replace manual sampling and detection. When in use, the detection device is connected to the fire hydrant through a tee, so that the municipal pipeline flushing and discharge water enters the flow system of the device through the fire hydrant, and is tested for turbidity and free chlorine through a turbidity detection module and a residual chlorine detection module. At the same time, the test results are output and it is determined whether the flushing requirements are met, and the user is prompted whether the flushing can be ended.

[0044] The present invention reduces the workload of manual sampling and testing, avoids water splashing during sampling, and can continuously monitor the water quality during the flushing process to avoid the situation where accidental water quality results lead to stopping flushing due to failing to meet flushing requirements or continuing flushing even after the flushing is qualified. In addition, the water quality changes during the flushing process can be saved, which is convenient for subsequent analysis and processing and the formulation of a more targeted pipeline maintenance plan.

[0045] For details, please refer to Figures 1 to 5 A preferred embodiment of the municipal pipeline flushing and discharge water quality monitoring device of the present invention includes: a box body 1, a secondary pressure reducing valve 2, a turbidity detection flow path system, a residual chlorine detection flow path system and a wastewater tank 3 arranged in the box body 1.

[0046] The turbidity detection flow path system and the residual chlorine detection flow path system are respectively connected to the two water outlets of the secondary pressure reducing valve 2, and the water inlet of the secondary pressure reducing valve 2 is connected to the pipeline to be detected.

[0047] The pipeline to be tested may be a municipal pipeline, which is connected to the fire hydrant 27 .

[0048] The turbidity detection flow system is used to detect the turbidity of the drainage from the pipeline to be tested, and the residual chlorine detection flow system is used to detect the residual chlorine in the drainage from the pipeline to be tested. These parameters can be displayed in real time on the display screen 14, and historical data records (in the form of a line graph) can be viewed. The monitoring data of 9 consecutive sites can be stored and can be connected to a USB flash drive to export in the form of EXCEL.

[0049] The turbidity detection flow path system includes a turbidity detection module 4, a turbidity detection water inlet pipeline 5, a turbidity detection drainage pipeline and a turbidity detection overflow pipeline 6. One end of the turbidity detection water inlet pipeline 5 is connected to one end of the secondary pressure reducing valve 2, and the other end of the turbidity detection water inlet pipeline 5 is connected to the water inlet of the turbidity detection module 4. A flow meter A is provided on the turbidity detection water inlet pipeline 5. One end of the turbidity detection drainage pipeline is connected to the drainage outlet of the turbidity detection module 4, and the other end is connected to the wastewater tank 3. A turbidity drainage ball valve 7 is provided on the turbidity detection drainage pipeline. One end of the turbidity detection overflow pipeline 6 is connected to the overflow outlet of the turbidity detection module 4, and the other end is connected to the wastewater tank 3.

[0050] The residual chlorine detection flow path system includes a residual chlorine detection module 8, a residual chlorine detection water inlet pipeline 9, a residual chlorine detection drainage pipeline and a residual chlorine detection overflow pipeline 10. One end of the residual chlorine detection water inlet pipeline 9 is connected to one end of the secondary pressure reducing valve 2, and the other end of the residual chlorine detection water inlet pipeline 9 is connected to the water inlet of the residual chlorine detection module 8. A flow meter B is provided on the residual chlorine detection water inlet pipeline 9. One end of the residual chlorine detection drainage pipeline is connected to the drainage outlet of the residual chlorine detection module 8, and the other end is connected to the wastewater tank 3. A residual chlorine drainage ball valve 11 is provided on the residual chlorine detection drainage pipeline. One end of the residual chlorine detection overflow pipeline 10 is connected to the overflow outlet of the residual chlorine detection module 8, and the other end is connected to the wastewater tank 3.

[0051] In this embodiment, the wastewater tank 3 is connected to an external drainage pipeline.

[0052] In this embodiment, a display component, a power module 12 , a data storage device and a mainboard controller 13 are provided in the housing 1 , and the display component, the power module 12 and the data storage device are connected to the mainboard controller 13 respectively.

[0053] In this embodiment, the display assembly includes a display screen 14 , a signal light 15 and a switch 16 , and the display screen 14 , the signal light 15 and the switch 16 are respectively connected to the mainboard controller 13 .

[0054] In this embodiment, a water inlet 25 and a water outlet 26 are provided at the bottom of the box body 1 . The water outlet 26 is communicated with the external drainage pipeline, and the water inlet 25 is connected to an external fire hydrant 27 .

[0055] In this embodiment, the water inlet is connected to the pipeline to be tested through a water inlet pipe. When performing water quality monitoring, the pipeline to be tested is connected to the tee 17. One end of the water inlet pipe is connected to the secondary pressure reducing valve 2, and the other end is connected to one end of the tee 17. A manual ball valve 18 and a pressure reducing valve 19 with a pressure gauge are provided on the water inlet pipe.

[0056] In this embodiment, port A of the tee 17 can be a standard DN65 fire protection port, or alternatively, a standard fire protection port of another caliber depending on the fire hydrant specifications. Port B, the monitoring equipment water inlet, should be connected to a two-branch rigid water inlet pipe. Port B, the monitoring equipment water inlet, should be connected to a two-branch rigid water inlet pipe. A 20mm female or male thread to male union connector solution can be considered.

[0057] It is recommended that port C of the tee 17 be smaller than or equal to port A. This will be determined based on actual testing results. For drain pipe connections, a standard port of DN32 or DN40 is recommended. Once the port C diameter is confirmed, the appropriate drain pipe and connector should be selected, taking into account ease of disassembly, portability, and water pressure. A flexible hose should not be used to connect the fire hydrant 27 to port A due to the high water pressure. A flexible pipe with either an internal or external thread can be used.

[0058] In this embodiment, a telescopic rod 20 and a lifting handle 21 are provided on the top of the outer box, universal wheels 22 and supporting legs 23 are provided on the bottom, and a back panel 24 is provided on the rear side of the outer box.

[0059] In this embodiment, it is characterized in that the turbidity detection module 4 and the residual chlorine detection module 8 both adopt electrode detection.

[0060] In this embodiment, the detection range of the turbidity detection module 4 is 0-100NTU, and the detection error is ±2% or 0.01NTU, whichever is greater. The detection range of the residual chlorine detection module 8 is 0-2mg / L, and the detection error is ±5% or 0.03mg / L, whichever is greater.

[0061] The working process of the utility model comprises the following steps:

[0062] Step S10, operation preparation: connection, inspection and debugging work before equipment startup, including battery power check, flow adjustment and setting flushing qualification index requirements, the flushing qualification index includes turbidity index, free chlorine index and duration index.

[0063] Step S10 specifically includes the following steps:

[0064] (1) Operation preparation:

[0065] A. Before starting the equipment, first connect the device to the fire hydrant outlet of the municipal pipeline to be discharged through a tee to avoid the situation where the pipeline is not connected properly and causes a large amount of leakage.

[0066] B. Close the turbidity drain ball valve and the residual chlorine drain ball valve.

[0067] C. Open the water inlet valve of the turbidity detection module and it is recommended to adjust the flow rate to about 350mL / min.

[0068] D. Open the water inlet valve of the residual chlorine detection module and it is recommended to adjust the flow rate to about 500mL / min.

[0069] E. Check whether the main battery is sufficiently charged and whether the battery needs to be replaced.

[0070] F. Check to ensure that the drain pipe remains connected to the atmosphere and has no bends to ensure smooth drainage and avoid leakage.

[0071] (2) Input flushing requirements:

[0072] Specifically, according to work requirements, requirements for the end of flushing can be input, including turbidity qualification standards, free chlorine qualification standards and duration.

[0073] It should be noted that the duration refers to the time during which the water quality monitoring results continue to meet the qualification requirements, mainly to avoid the erroneous judgment that flushing can be stopped due to the water quality fluctuation causing the water quality to meet the standard instantaneously.

[0074] Step S20, start flushing monitoring: open the pipeline to be tested for flushing, click the "Start Flushing" button on the display screen, and enter the name of the flushing pipeline to start pipeline flushing and water quality monitoring.

[0075] Specifically, after confirming that the equipment is running well, start the equipment.

[0076] (1) Enter the pipe name.

[0077] (2) Click "Start Rinse".

[0078] After clicking, the flushing status changes to start and the indicator light flashes (the flashing light is red at this time, which means that the flushing requirements have not been met and flushing needs to continue). At this time, the screen continuously outputs the real-time monitoring results of turbidity and free chlorine and the flushing time.

[0079] Step S30, flushing process: continuously monitor the turbidity and free chlorine of the flushing drainage, display the real-time values ​​on the display screen, and store the data in a file named after the pipe in real time;

[0080] Step S40, end flushing: After the device monitors that the turbidity index, free chlorine index and duration index have reached the qualified requirements, it automatically issues a reminder to end flushing. After the user confirms and clicks "End Flushing", the switch of the pipeline to be tested is turned off and the connection between the device and the pipeline to be tested is disconnected, completing the pipeline flushing water quality test.

[0081] Step S40 specifically includes:

[0082] (1) When the monitoring results meet the flushing requirements entered previously, the system will pop up a dialog box to remind you to end the flushing and switch the flashing light color to green. The user can click "Confirm end of flushing" to complete the water quality monitoring. At the same time, the water quality monitoring results of the cleaning process (referring to the process from clicking "Start flushing" to clicking "Confirm end of flushing") will be automatically saved to the TF card and the screen. There is no need to export the data after the flushing is completed.

[0083] (2) Simply connect the disconnect device to the fire hydrant.

[0084] The beneficial effects of the municipal pipeline flushing discharge water quality monitoring device of the present invention are:

[0085] The present invention uses online monitoring means to replace manual sampling and detection. When in use, the detection device is connected to the fire hydrant through a tee, so that the municipal pipeline flushing discharge water enters the flow system of the device through the fire hydrant, and the turbidity and free chlorine are detected by the turbidity detection module and the residual chlorine detection module. At the same time, the test results are output and it is judged whether the flushing requirements are met, and the user is prompted whether the flushing can be ended. The workload of manual sampling and testing is reduced, and water splashing during sampling is avoided. At the same time, the water quality of the flushing process can be continuously monitored to avoid the situation where accidental water quality results lead to stopping flushing because the flushing requirements are not met or continuing flushing after the flushing is qualified. In addition, the water quality changes during the flushing process can be saved, which is convenient for subsequent analysis and processing and the formulation of a more targeted pipeline maintenance plan.

[0086] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A municipal pipeline flushing discharge water quality monitoring device, characterized in that: include: A box body, a secondary pressure reducing valve, a turbidity detection flow path system, a residual chlorine detection flow path system and a wastewater tank arranged in the box body; The turbidity detection flow path system and the residual chlorine detection flow path system are respectively connected to the two water outlets of the secondary pressure reducing valve, and the water inlet of the secondary pressure reducing valve is connected to the pipeline to be detected; The turbidity detection flow path system includes a turbidity detection module, a turbidity detection water inlet pipeline, a turbidity detection drainage pipeline and a turbidity detection overflow pipeline. One end of the turbidity detection water inlet pipeline is connected to one end of the secondary pressure reducing valve, and the other end of the turbidity detection water inlet pipeline is connected to the water inlet of the turbidity detection module. A flow meter A is provided on the turbidity detection water inlet pipeline. One end of the turbidity detection drainage pipeline is connected to the drainage outlet of the turbidity detection module, and the other end is connected to the wastewater tank. A turbidity drainage ball valve is provided on the turbidity detection drainage pipeline. One end of the turbidity detection overflow pipeline is connected to the overflow outlet of the turbidity detection module, and the other end is connected to the wastewater tank. The residual chlorine detection flow path system includes a residual chlorine detection module, a residual chlorine detection water inlet pipeline, a residual chlorine detection drainage pipeline and a residual chlorine detection overflow pipeline. One end of the residual chlorine detection water inlet pipeline is connected to one end of the secondary pressure reducing valve, and the other end of the residual chlorine detection water inlet pipeline is connected to the water inlet of the residual chlorine detection module. A flow meter B is provided on the residual chlorine detection water inlet pipeline, one end of the residual chlorine detection drainage pipeline is connected to the drainage outlet of the residual chlorine detection module, and the other end is connected to the wastewater tank. A residual chlorine drainage ball valve is provided on the residual chlorine detection drainage pipeline, one end of the residual chlorine detection overflow pipeline is connected to the overflow outlet of the residual chlorine detection module, and the other end is connected to the wastewater tank.

2. The municipal pipeline flushing discharge water quality monitoring device according to claim 1 is characterized in that: The wastewater tank is connected to an external drainage pipeline.

3. The municipal pipeline flushing discharge water quality monitoring device according to claim 1 is characterized in that: A display component, a power module, a data storage device and a mainboard controller are arranged in the box, and the display component, the power module and the data storage device are connected to the mainboard controller respectively.

4. The municipal pipeline flushing discharge water quality monitoring device according to claim 3 is characterized in that: The display assembly includes a display screen, a signal light and a switch, and the display screen, the signal light and the switch are respectively connected to the mainboard controller.

5. The municipal pipeline flushing discharge water quality monitoring device according to claim 2 is characterized in that: A water inlet and a water outlet are provided at the bottom of the box body. The water outlet is communicated with the external drainage pipeline, and the water inlet is connected to an external fire hydrant.

6. The municipal pipeline flushing discharge water quality monitoring device according to claim 5 is characterized in that: The water inlet is connected to the pipeline to be tested through a water inlet pipe. When performing water quality monitoring, the pipeline to be tested is connected to a tee. One end of the water inlet pipe is connected to the secondary pressure reducing valve, and the other end is connected to one end of the tee. A manual ball valve and a pressure reducing valve with a pressure gauge are provided on the water inlet pipe.

7. The municipal pipeline flushing discharge water quality monitoring device according to claim 1 is characterized in that: The top of the box body is provided with a telescopic rod and a lifting handle, the bottom is provided with universal wheels and supporting feet, and the rear side of the box body is provided with a backboard.

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