Tail water treatment device for food deep processing

Abstract

The utility model relates to the technical field of wastewater treatment, in particular to a food deep processing tail water treatment device, which is characterized in that a liquid conveying assembly conveys wastewater filtered by a first filter box assembly; waste water passing through the water inlet pipe and the first three-way pipe enters the second filter box assembly and stops entering the first filter box assembly, then the liquid conveying assembly is operated to convey the filtered waste water into the first filter box assembly for backwashing operation, and continuous waste water treatment is achieved; comprising a water inlet pipe, a first three-way pipe and a bottom plate, and further comprises a first filter box assembly, a second filter box assembly and a liquid conveying assembly, the first filter box assembly and the second filter box assembly are arranged at the top end of the bottom plate, and the output end of the water inlet pipe communicates with the input end of the first three-way pipe; two output ends of the first three-way pipe are communicated with the first filter box assembly and the second filter box assembly respectively, and a liquid conveying assembly is arranged at the top end of the bottom plate.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, in particular to a device for treating tail water from food deep processing. Background Art

[0002] Food deep processing tail water refers to the wastewater generated during the deep processing of food. The existing technology for treating this wastewater is to filter the wastewater through a filter net.

[0003] In the prior art, the patent document with announcement number CN219663045U discloses a food processing wastewater treatment device, including a shell, a support leg installed at the bottom of the shell, a water inlet at the upper right side of the shell, a drain outlet at the lower left side of the shell, a sewage outlet at the right side of the bottom of the shell, a sealing door at the bottom of the sewage outlet, a filter screen obliquely arranged at the inner cavity of the shell, one end of the filter screen near the bottom is hinged to the shell, and one end of the bottom of the shell is fixedly connected to the sealing door. It is convenient to clean the filter screen.

[0004] During use, it was found that when the above-mentioned device cleans the filter, the wastewater filtering process needs to be stopped, which affects the wastewater treatment efficiency. At the same time, manual cooperation of staff is required when cleaning the filter, which is less convenient. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a food deep processing tail water treatment device with improved filtration efficiency.

[0006] The utility model discloses a food deep processing tail water treatment device, comprising a water inlet pipe, a No. 1 three-way pipe and a bottom plate, and also comprising a No. 1 filter box assembly, a No. 2 filter box assembly and an infusion assembly. The top of the bottom plate is respectively provided with a No. 1 filter box assembly and a No. 2 filter box assembly, the output end of the water inlet pipe is connected with the input end of the No. 1 three-way pipe, and the two groups of output ends of the No. 1 three-way pipe are respectively connected with the No. 1 filter box assembly and the No. 2 filter box assembly, and the top of the bottom plate is provided with an infusion assembly, which is used for conveying the waste water filtered by the No. 1 filter box assembly and the No. 2 filter box assembly while transmitting the waste water filtered by the No. 1 filter box assembly to the No. 1 filter box assembly. The No. 1 filter box assembly and the No. 2 filter box assembly are backwashed; when in use, wastewater enters the No. 1 filter box assembly through the water inlet pipe and the No. 1 three-way pipe, and the infusion assembly conveys the wastewater filtered by the No. 1 filter box assembly. When the No. 1 filter box assembly needs to be cleaned, the wastewater passing through the water inlet pipe and the No. 1 three-way pipe enters the No. 2 filter box assembly and stops entering the No. 1 filter box assembly, and then the infusion assembly is operated to convey the filtered wastewater to the No. 1 filter box assembly for backwashing, thereby realizing continuous wastewater treatment and semi-automatic backwashing of the No. 1 filter box assembly.

[0007] Preferably, the No. 1 filter box assembly includes a No. 1 input pipe, a No. 1 filter box, a No. 1 water transfer valve, a No. 1 sewage pipe, a No. 1 sewage valve and a No. 1 output pipe, the input end of the No. 1 input pipe is connected to a group of output ends of a No. 1 three-way pipe, the output end of the No. 1 input pipe is connected to the input end of the No. 1 filter box, a No. 1 output pipe is provided at the output end of the No. 1 filter box, a group of No. 1 water transfer valves are respectively provided on the No. 1 output pipe and the No. 1 input pipe, a No. 1 sewage pipe is provided on the No. 1 sewage pipe, a No. 1 sewage valve is installed on the No. 1 sewage pipe, and a No. 1 sealing cover is provided on the top of the No. 1 filter box; open the two groups of No. 1 water transfer valves, so that the wastewater enters through the water inlet pipe and the No. 1 three-way pipe, is filtered through the filter net inside the No. 1 filter box, and is then transported through the infusion assembly to improve the filtration efficiency.

[0008] Preferably, the No. 2 filter box assembly includes a No. 2 input pipe, a No. 2 filter box, a No. 2 water supply valve, a No. 2 sewage pipe, a No. 2 sewage valve and a No. 2 output pipe, the input end of the No. 2 input pipe is connected with a group of output ends of a No. 1 three-way pipe, the output end of the No. 2 input pipe is connected with the input end of the No. 2 filter box, the output end of the No. 2 filter box is provided with a No. 2 output pipe, the No. 2 output pipe and the No. 2 input pipe are respectively provided with a No. 2 water supply valve, the No. 2 input pipe is provided with a No. 2 sewage pipe, the No. 2 sewage pipe is installed with a No. 2 sewage valve, and the top of the No. 2 filter box is provided with a No. 2 sealing cover; open the two groups of No. 2 water supply valves and close the two groups of No. 1 water supply valves, so that the wastewater enters the No. 2 filter box through the water inlet pipe and the No. 1 three-way pipe for wastewater filtration, realize the switching of the No. 1 filter box and the No. 2 filter box, and improve the wastewater filtration effect.

[0009] Preferably, the infusion assembly includes a No. 2 three-way pipe, a water pump, a four-way pipe, a No. 1 flushing pipe, a No. 1 flushing valve, a No. 2 flushing pipe, a No. 2 flushing valve, an external pipe and an external valve, a water pump is arranged at the top of the bottom plate, the output end of the No. 1 output pipe and the output end of the No. 2 output pipe are respectively connected with the two groups of input ends of the No. 2 three-way pipe, the output end of the No. 2 three-way pipe is connected with the input end of the water pump, the water pump is installed at the top of the bottom plate, the output end of the water pump is connected with the input end of the four-way pipe, the first group of output ends of the four-way pipe are connected with the input end of the No. 1 flushing pipe, the output end of the No. 1 flushing pipe is connected with one end of the No. 1 filter box, the No. 1 flushing valve is installed on the No. 1 flushing pipe, the second group of output ends of the four-way pipe are connected with the input end of the No. 2 flushing pipe, the output end of the No. 2 flushing pipe is connected with one end of the No. 2 filter box, the No. 2 flushing valve is installed on the No. 2 flushing pipe, the third group of output ends of the four-way pipe are connected with the input end of the external pipe, and the external valve is installed on the external pipe; open When the filter screen inside the No. 1 filter box needs to be cleaned, the No. 1 water supply valve and the No. 2 water supply valve are closed, and the No. 1 flushing valve and the No. 2 flushing valve are closed, and the water pump is started, so that the waste water is filtered by the No. 1 filter box and discharged through the external discharge pipe. When the filter screen inside the No. 1 filter box needs to be cleaned, the two groups of No. 1 water supply valves are closed and the two groups of No. 2 water supply valves are opened to complete the switching of the No. 1 filter box and the No. 2 filter box. After the waste water is filtered by the No. 2 filter box, the No. 1 flushing valve and the No. 1 sewage valve are opened, so that the waste water filtered by the No. 2 filter box enters the No. 1 filter box through the No. 1 flushing pipe with the cooperation of the water pump to backwash the filter screen inside the No. 1 filter box, and the waste water and impurities on the filter screen are discharged through the No. 1 sewage pipe to realize semi-automatic flushing. When the filter screen inside the No. 1 filter box is seriously clogged and the backwashing effect is not good, the No. 1 sealing cover on the No. 1 filter box can be removed for manual cleaning to improve flexibility and convenience.

[0010] Preferably, the inner sides of the No. 1 filter box and the No. 2 filter box are provided with an anti-rust coating; the anti-rust coating increases the service life of the No. 1 filter box and the No. 2 filter box.

[0011] Preferably, it further comprises a handle, and a group of handles are respectively provided on the top of the No. 1 sealing cover and the No. 2 sealing cover; when the No. 1 sealing cover or the No. 2 sealing cover needs to be disassembled, it can be moved through the corresponding handle to improve convenience.

[0012] Compared with the prior art, the utility model has the following beneficial effects: when in use, wastewater enters the No. 1 filter box assembly through the water inlet pipe and the No. 1 three-way pipe, and the infusion assembly conveys the wastewater filtered by the No. 1 filter box assembly. When the No. 1 filter box assembly needs to be cleaned, the wastewater passing through the water inlet pipe and the No. 1 three-way pipe enters the No. 2 filter box assembly and stops entering the No. 1 filter box assembly. Thereafter, the infusion assembly is operated to convey the filtered wastewater to the No. 1 filter box assembly for backwashing, thereby realizing continuous wastewater treatment and semi-automatic backwashing of the No. 1 filter box assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a first axonometric structural schematic diagram of the utility model;

[0014] Figure 2 It is a second axonometric structural schematic diagram of the utility model;

[0015] Figure 3 It is an enlarged structural diagram of the structure including the No. 1 tee pipe and the No. 2 input pipe;

[0016] Figure 4 It is an enlarged structural diagram of structures such as a water pump and a four-way pipe.

[0017] Markings in the attached figure: 1, water inlet pipe; 2, No. 1 three-way pipe; 3, No. 1 input pipe; 4, No. 1 filter box; 5, No. 1 water supply valve; 6, No. 1 sewage pipe; 7, No. 1 sewage valve; 8, No. 2 input pipe; 9, No. 2 filter box; 10, No. 2 water supply valve; 11, No. 2 sewage pipe; 12, No. 2 sewage valve; 13, No. 2 three-way pipe; 15, water pump; 16, four-way pipe; 17, No. 1 flushing pipe; 18, No. 1 flushing valve; 19, No. 2 flushing pipe; 20, No. 2 flushing valve; 21, external discharge pipe; 22, external discharge valve; 23, handle; 24, bottom plate; 25, No. 1 output pipe; 26, No. 2 output pipe. DETAILED DESCRIPTION

[0018] In order to facilitate the understanding of the utility model, the utility model will be described more comprehensively below with reference to the relevant drawings. The utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0019] Example 1

[0020] like Figure 1 and Figure 2 As shown, a food deep processing tail water treatment device of the utility model comprises an inlet pipe 1, a No. 1 three-way pipe 2 and a bottom plate 24, and also comprises a No. 1 filter box assembly, a No. 2 filter box assembly and an infusion assembly. The top of the bottom plate 24 is respectively provided with a No. 1 filter box assembly and a No. 2 filter box assembly. The output end of the inlet pipe 1 is connected with the input end of the No. 1 three-way pipe 2, and the two groups of output ends of the No. 1 three-way pipe 2 are respectively connected with the No. 1 filter box assembly and the No. 2 filter box assembly. The top of the bottom plate 24 is provided with an infusion assembly, which is used to transport the wastewater filtered by the No. 1 filter box assembly and the No. 2 filter box assembly while backwashing the No. 1 filter box assembly and the No. 2 filter box assembly.

[0021] like Figures 1 to 4As shown, the No. 1 filter box assembly includes a No. 1 input pipe 3, a No. 1 filter box 4, a No. 1 water delivery valve 5, a No. 1 sewage pipe 6, a No. 1 sewage valve 7 and a No. 1 output pipe 25. The input end of the No. 1 input pipe 3 is connected to a group of output ends of the No. 1 three-way pipe 2, and the output end of the No. 1 input pipe 3 is connected to the input end of the No. 1 filter box 4. The No. 1 output pipe 25 is provided at the output end of the No. 1 filter box 4. A group of No. 1 water delivery valves 5 are respectively provided on the No. 1 output pipe 25 and the No. 1 input pipe 3. A No. 1 sewage pipe 6 is provided on the No. 1 sewage pipe 6. A No. 1 sewage valve 7 is installed on the No. 1 sewage pipe 6. A No. 1 sealing cover is provided at the top of the No. 1 filter box 4.

[0022] like Figures 1 to 4 As shown, the No. 2 filter box assembly includes a No. 2 input pipe 8, a No. 2 filter box 9, a No. 2 water transfer valve 10, a No. 2 sewage pipe 11, a No. 2 sewage valve 12 and a No. 2 output pipe 26. The input end of the No. 2 input pipe 8 is connected to a group of output ends of the No. 1 three-way pipe 2, and the output end of the No. 2 input pipe 8 is connected to the input end of the No. 2 filter box 9. The No. 2 output pipe 26 is provided at the output end of the No. 2 filter box 9. The No. 2 water transfer valve 10 is provided on the No. 2 output pipe 26 and the No. 2 input pipe 8 respectively. The No. 2 input pipe 8 is provided with a No. 2 sewage pipe 11, and the No. 2 sewage pipe 11 is installed with a No. 2 sewage valve 12. The top of the No. 2 filter box 9 is provided with a No. 2 sealing cover.

[0023] In this embodiment, the two groups of No. 1 water supply valves 5 are opened, and the two groups of No. 2 water supply valves 10 are closed, and the infusion assembly is started, so that the waste water enters the No. 1 filter box 4 through the water inlet pipe 1 and the No. 1 three-way pipe 2 and is filtered through the filter net inside the No. 1 filter box 4. When it is necessary to switch the No. 1 filter box 4 and the No. 2 filter box 9, the two groups of No. 1 water supply valves 5 are closed and the two groups of No. 2 water supply valves 10 are opened, thereby completing the switching of the No. 1 filter box 4 and the No. 2 filter box 9 and improving the filtration efficiency.

[0024] Example 2

[0025] like Figure 1 and Figure 2 As shown, a food deep processing tail water treatment device of the utility model comprises an inlet pipe 1, a No. 1 three-way pipe 2 and a bottom plate 24, and also comprises a No. 1 filter box assembly, a No. 2 filter box assembly and an infusion assembly. The top of the bottom plate 24 is respectively provided with a No. 1 filter box assembly and a No. 2 filter box assembly. The output end of the inlet pipe 1 is connected with the input end of the No. 1 three-way pipe 2, and the two groups of output ends of the No. 1 three-way pipe 2 are respectively connected with the No. 1 filter box assembly and the No. 2 filter box assembly. The top of the bottom plate 24 is provided with an infusion assembly, which is used to transport the wastewater filtered by the No. 1 filter box assembly and the No. 2 filter box assembly while backwashing the No. 1 filter box assembly and the No. 2 filter box assembly.

[0026] like Figures 1 to 4As shown, the No. 1 filter box assembly includes a No. 1 input pipe 3, a No. 1 filter box 4, a No. 1 water delivery valve 5, a No. 1 sewage pipe 6, a No. 1 sewage valve 7 and a No. 1 output pipe 25. The input end of the No. 1 input pipe 3 is connected to a group of output ends of the No. 1 three-way pipe 2, and the output end of the No. 1 input pipe 3 is connected to the input end of the No. 1 filter box 4. The No. 1 output pipe 25 is provided at the output end of the No. 1 filter box 4. A group of No. 1 water delivery valves 5 are respectively provided on the No. 1 output pipe 25 and the No. 1 input pipe 3. A No. 1 sewage pipe 6 is provided on the No. 1 sewage pipe 6. A No. 1 sewage valve 7 is installed on the No. 1 sewage pipe 6. A No. 1 sealing cover is provided at the top of the No. 1 filter box 4.

[0027] like Figures 1 to 4 As shown, the No. 2 filter box assembly includes a No. 2 input pipe 8, a No. 2 filter box 9, a No. 2 water delivery valve 10, a No. 2 sewage pipe 11, a No. 2 sewage valve 12 and a No. 2 output pipe 26. The input end of the No. 2 input pipe 8 is connected to a group of output ends of the No. 1 three-way pipe 2, and the output end of the No. 2 input pipe 8 is connected to the input end of the No. 2 filter box 9. The No. 2 output pipe 26 is provided at the output end of the No. 2 filter box 9. The No. 2 water delivery valve 10 is provided on the No. 2 output pipe 26 and the No. 2 input pipe 8, respectively. The No. 2 sewage pipe 11 is provided on the No. 2 input pipe 8, and the No. 2 sewage pipe 11 is installed with the No. 2 sewage valve 12. The top of the No. 2 filter box 9 is provided with a No. 2 sealing cover;

[0028] like Figures 1 to 3 As shown, the infusion assembly includes a No. 2 three-way pipe 13, a water pump 15, a four-way pipe 16, a No. 1 flushing pipe 17, a No. 1 flushing valve 18, a No. 2 flushing pipe 19, a No. 2 flushing valve 20, an external discharge pipe 21 and an external discharge valve 22. The water pump 15 is arranged on the top of the bottom plate 24. The output end of the No. 1 output pipe 25 and the output end of the No. 2 output pipe 26 are respectively connected to the two groups of input ends of the No. 2 three-way pipe 13, and the output end of the No. 2 three-way pipe 13 is connected to the input end of the water pump 15. The water pump 15 is installed on the top of the bottom plate 24. The output end of the water pump 15 is connected to the input end of the four-way pipe 16. The first output end of the cross-tube 16 is connected to the input end of the No. 1 flushing pipe 17, the output end of the No. 1 flushing pipe 17 is connected to one end of the No. 1 filter box 4, and the No. 1 flushing valve 18 is installed on the No. 1 flushing pipe 17. The second output end of the cross-tube 16 is connected to the input end of the No. 2 flushing pipe 19, the output end of the No. 2 flushing pipe 19 is connected to one end of the No. 2 filter box 9, and the No. 2 flushing valve 20 is installed on the No. 2 flushing pipe 19. The third output end of the cross-tube 16 is connected to the input end of the external discharge pipe 21, and the external discharge pipe 21 is installed with an external discharge valve 22;

[0029] It also includes handles 23. A group of handles 23 are respectively provided on the top of the No. 1 sealing cover and the No. 2 sealing cover.

[0030] In this embodiment, the two groups of No. 1 water delivery valves 5 are opened, and the two groups of No. 2 water delivery valves 10 are closed, the two groups of No. 1 water delivery valves 5 are opened, and the two groups of No. 2 water delivery valves 10 are closed, the No. 1 flushing valve 18 and the No. 2 flushing valve 20 are closed, and the water pump 15 is started, so that the waste water is filtered through the No. 1 filter box 4 and then discharged through the external discharge pipe 21. When it is necessary to clean the filter screen inside the No. 1 filter box 4, the two groups of No. 1 water delivery valves 5 are closed and the two groups of No. 2 water delivery valves 10 are opened, and the switching of the No. 1 filter box 4 and the No. 2 filter box 9 is completed, and the waste water After filtering through the No. 2 filter box 9, open the No. 1 flushing valve 18 and the No. 1 drain valve 7, so that the wastewater filtered by the No. 2 filter box 9 enters the No. 1 filter box 4 through the No. 1 flushing pipe 17 with the cooperation of the water pump 15 to backwash the filter screen inside the No. 1 filter box 4, and the wastewater and impurities on the filter screen are discharged through the No. 1 drain pipe 6 to achieve semi-automatic flushing. When the filter screen inside the No. 1 filter box 4 is seriously clogged and the backwashing effect is not good, the No. 1 sealing cover on the No. 1 filter box 4 can be removed for manual cleaning.

[0031] The utility model is a device for treating tail water from deep processing of food, wherein filter screens are arranged inside the first filter box 4 and the second filter box 9; the water pump 15 of the device for treating tail water from deep processing of food of the utility model is purchased on the market, and technicians in the industry only need to install and operate it according to the instruction manual attached thereto, without the need for technicians in the field to make creative efforts.

[0032] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A food deep processing tail water treatment device, comprising a water inlet pipe (1), a No. 1 three-way pipe (2) and a bottom plate (24), characterized in that: It also comprises a No. 1 filter box assembly, a No. 2 filter box assembly and an infusion assembly. The No. 1 filter box assembly and the No. 2 filter box assembly are respectively arranged at the top of the bottom plate (24). The output end of the water inlet pipe (1) is connected to the input end of the No. 1 three-way pipe (2). The two groups of output ends of the No. 1 three-way pipe (2) are respectively connected to the No. 1 filter box assembly and the No. 2 filter box assembly. The top of the bottom plate (24) is provided with an infusion assembly. The infusion assembly is used to transport the wastewater filtered by the No. 1 filter box assembly and the No. 2 filter box assembly while backwashing the No. 1 filter box assembly and the No. 2 filter box assembly.

2. A food deep processing tail water treatment device as claimed in claim 1, characterized in that: The No. 1 filter box assembly comprises a No. 1 input pipe (3), a No. 1 filter box (4), a No. 1 water delivery valve (5), a No. 1 sewage pipe (6), a No. 1 sewage valve (7) and a No. 1 output pipe (25). The input end of the No. 1 input pipe (3) is connected to a group of output ends of a No. 1 three-way pipe (2). The output end of the No. 1 input pipe (3) is connected to the input end of the No. 1 filter box (4). The No. 1 output pipe (25) is arranged at the output end of the No. 1 filter box (4). A group of No. 1 water delivery valves (5) are arranged on the No. 1 output pipe (25) and the No. 1 input pipe (3), respectively. The No. 1 sewage pipe (6) is arranged on the No. 1 sewage pipe (6). The No. 1 sewage valve (7) is installed on the No. 1 sewage pipe (6). The top of the No. 1 filter box (4) is provided with a No. 1 sealing cover.

3. A food deep processing tail water treatment device as claimed in claim 2, characterized in that: The No. 2 filter box assembly comprises a No. 2 input pipe (8), a No. 2 filter box (9), a No. 2 water delivery valve (10), a No. 2 sewage pipe (11), a No. 2 sewage valve (12) and a No. 2 output pipe (26). The input end of the No. 2 input pipe (8) is connected to a group of output ends of the No. 1 three-way pipe (2). The output end of the No. 2 input pipe (8) is connected to the input end of the No. 2 filter box (9). The output end of the No. 2 filter box (9) is provided with a No. 2 output pipe (26). The No. 2 output pipe (26) and the No. 2 input pipe (8) are respectively provided with a No. 2 water delivery valve (10). The No. 2 input pipe (8) is provided with a No. 2 sewage pipe (11). The No. 2 sewage pipe (11) is installed with a No. 2 sewage valve (12). The top of the No. 2 filter box (9) is provided with a No. 2 sealing cover.

4. A food deep processing tail water treatment device as claimed in claim 3, characterized in that: The infusion assembly comprises a No. 2 three-way pipe (13), a water pump (15), a four-way pipe (16), a No. 1 flushing pipe (17), a No. 1 flushing valve (18), a No. 2 flushing pipe (19), a No. 2 flushing valve (20), an external discharge pipe (21) and an external discharge valve (22). The water pump (15) is arranged at the top of the bottom plate (24). The output end of the No. 1 output pipe (25) and the output end of the No. 2 output pipe (26) are respectively connected to two groups of input ends of the No. 2 three-way pipe (13). The output end of the No. 2 three-way pipe (13) is connected to the input end of the water pump (15). The water pump (15) is installed at the top of the bottom plate (24). The output end of the water pump (15) is connected to the four-way pipe (16). The first group of output ends of the cross-tube (16) is connected to the input end of the No. 1 flushing pipe (17), the output end of the No. 1 flushing pipe (17) is connected to one end of the No. 1 filter box (4), and the No. 1 flushing pipe (17) is installed with a No. 1 flushing valve (18). The second group of output ends of the cross-tube (16) is connected to the input end of the No. 2 flushing pipe (19), the output end of the No. 2 flushing pipe (19) is connected to one end of the No. 2 filter box (9), and the No. 2 flushing pipe (19) is installed with a No. 2 flushing valve (20). The third group of output ends of the cross-tube (16) is connected to the input end of the external discharge pipe (21), and the external discharge pipe (21) is installed with an external discharge valve (22).

5. A food deep processing tail water treatment device as claimed in claim 3, characterized in that: The inner sides of the No. 1 filter box (4) and the No. 2 filter box (9) are provided with an anti-rust coating.

6. A food deep processing tail water treatment device as claimed in claim 3, characterized in that: It also includes handles (23), and the top ends of the No. 1 sealing cover and the No. 2 sealing cover are respectively provided with a group of handles (23).

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