Pressure filter for wastewater treatment of finishing machine

Abstract

The utility model discloses a pressure filter for wastewater treatment of a finishing machine. Comprising a shell, an upper end cover and a lower end cover, the top opening end of the shell is detachably connected with the upper end cover, the top of the upper end cover is connected with a backwashing pipe, the bottom opening end of the shell is detachably connected with the lower end cover, the bottom of the lower end cover is connected with a water outlet pipe, the side wall of the lower end cover is connected with an emptying pipe, and the upper portion of the shell is connected with a water inlet pipe. The filter element comprises a filter layer and a magnetic bar, the filter layer and the magnetic bar are used for effectively removing residual zinc powder and iron powder in wastewater, the quality of effluent is guaranteed, and the service life of the filter element is prolonged by backwashing the filter element. The device has the advantages of stable effluent quality, small occupied area, long service life of the filter element and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental protection sewage treatment, and particularly relates to a pressure filter for wastewater treatment of a skin pass mill. Background Art

[0002] The existing hot-dip galvanized skin pass mill often adopts a wet skin pass process. The wastewater generated by the wet skin pass generally contains pollutants such as residual skin pass solution, zinc powder, iron powder, machine oil and other impurities. Under the current trend of zero discharge and energy conservation and emission reduction, the reuse treatment of the wastewater of the skin pass mill is a treatment method with great potential and economic benefits. At present, the reuse treatment of the wastewater of the skin pass mill usually adopts "pretreatment + membrane treatment". The wastewater of the skin pass mill contains a certain amount of zinc powder, iron powder and oil substances, which seriously affect the stable operation of the membrane and need to be pretreated before entering the subsequent membrane treatment device. The existing pretreatment device has limited ability to remove zinc powder and iron powder. In order to alleviate the influence of the wastewater quality of the skin pass mill on the membrane operation, a filter is generally adopted at the front end of the membrane device as a safeguard measure. The filter element of the existing filter is difficult to meet the water quality requirements, and the filter element needs to be replaced relatively frequently, increasing the labor and operation costs. Content of the Utility Model

[0003] The purpose of the utility model is to solve the problems in the current technology and provide a pressure filter for wastewater treatment of a skin pass mill.

[0004] To achieve the above purpose, the technical solution of the utility model is as follows:

[0005] A pressure filter for wastewater treatment of a skin pass mill includes a housing. The housing is a cylindrical shape that is vertically through. The top open end of the housing is detachably connected to an upper end cover. The top of the upper end cover is connected to a backwash pipe. The upper part of the housing is connected to a water inlet pipe. The bottom open end of the housing is detachably connected to a lower end cover. The bottom of the lower end cover is connected to a water outlet pipe. The upper side wall of the lower end cover is connected to an emptying pipe.

[0006] A filter element is installed inside the housing. A top baffle is arranged at the top of the filter element, and a bottom baffle is arranged at the bottom of the filter element.

[0007] The filter element includes a magnetic rod. A filter layer assembly is sleeved outside the magnetic rod. A water passing channel is left between the magnetic rod and the filter layer assembly.

[0008] Only the upper end of the water passing channel passes through the top baffle and is communicated with the space inside the upper end cover. Only the lower end of the water passing channel passes through the bottom baffle and is communicated with the space inside the lower end cover. And the height of the top baffle is higher than the height of the water inlet pipe, and the height of the emptying pipe is higher than the height of the bottom baffle.

[0009] As described above, the filter layer assembly includes a filter layer, a transition layer and a support layer in sequence from outside to inside.

[0010] As described above, a filter element water guide plate is arranged between the filter layer assembly and the magnetic bar. The filter element water guide plate is arranged along the circumferential direction of the magnetic bar and is fixed by fixing plates arranged at both ends of the magnetic bar. Water passing openings are arranged on the fixing plates, and the space between the water passing openings on the fixing plates and the filter element water guide plate is communicated.

[0011] As described above, an opening is arranged at the corresponding position of the fixing plate at the top of the magnetic bar and the magnetic bar. A connecting portion is arranged at the top of the magnetic bar, and the connecting portion passes through the opening of the fixing plate at the top of the magnetic bar and is connected to the pulling-out device.

[0012] As described above, a diversion sleeve is connected to the top of the filter layer assembly. The diversion sleeve is sleeved outside the connecting portion. Water passing openings are arranged on the side wall of the diversion sleeve. A water diversion channel is left between the inner wall of the diversion sleeve and the connecting portion, and the water diversion channel is communicated with the water passing channel;

[0013] The bottom of the filter layer assembly is connected to a bottom sleeve. An outlet sleeve is arranged on the bottom baffle, and the lower part of the bottom sleeve is communicated with the outlet sleeve.

[0014] As described above, there are multiple inlet pipes which are evenly arranged along the circumferential direction of the housing, and the multiple inlet pipes intake water simultaneously.

[0015] As described above, valves are installed on the inlet pipe, backwash pipe, drain pipe and outlet pipe.

[0016] As described above, the valve of the outlet pipe is connected to external compressed air.

[0017] As described above, a pressure sensor is arranged on the upper end cover.

[0018] As described above, sealing rings are arranged on the top baffle around each diversion sleeve; a sealing ring is sleeved outside the outlet sleeve.

[0019] The beneficial technical effects of the present utility model are:

[0020] The filter element of the present utility model uses a filter cloth and a magnetic bar to remove zinc powder and iron powder in the waste water of the skin pass mill. During operation, the filter element can be backwashed to restore the filtering performance of the filter element. The zinc powder and iron powder after backwashing are discharged from the filter, realizing the reuse of the filter element of the filter, effectively extending the replacement cycle of the filter element of the filter. At the same time, a magnetic bar is arranged inside the filter element, effectively removing the zinc powder and iron powder not intercepted by the filter cloth, ensuring the water quality of the outlet water, and having the advantages of small floor area of the equipment, stable water quality of the outlet water, and few maintenance times. Description of the Drawings

[0021] Figure 1 is a schematic structural diagram of a pressure filter for treating waste water of a skin pass mill;

[0022] Figure 2 is a schematic structural diagram of the top baffle;

[0023] Figure 3It is a schematic diagram of the overall structure of the filter element;

[0024] Figure 4 It is a schematic diagram of the sectional structure of the filter element.

[0025] In the figure: 1 - outer shell; 2 - upper end cover; 3 - lower end cover; 4 - water inlet pipe; 5 - water outlet pipe; 6 - drain pipe; 7 - backwash pipe; 8 - bottom flange; 9 - quick-connect flange; 10 - top baffle; 11 - bottom baffle; 12 - bracket; 13 - water outlet sleeve; 14 - filter element; 21 - magnetic rod; 22 - filter element water guide plate; 23 - filter layer assembly; 24 - bottom sleeve; 25 - extraction device, 26 - connection part, 27 - diversion sleeve. Specific embodiments

[0026] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0027] As Figures 1 to 4 , a pressure filter for light mill wastewater treatment, includes an outer shell 1, an upper end cover 2, and a lower end cover 3. The outer shell 1 is a cylindrical shape that is open at both the top and bottom. The top open end of the outer shell 1 is detachably connected to the upper end cover 2 (in this embodiment, the top open end of the outer shell 1 is connected to the upper end cover 2 through a quick-connect flange 9). The top of the upper end cover 2 is connected to the backwash pipe 7. The upper part of the outer shell 1 is connected to the water inlet pipe 4. The bottom open end of the outer shell 1 is detachably connected to the lower end cover 3 (in this embodiment, the bottom open end of the outer shell 1 is connected to the lower end cover 3 through a bottom flange 8). The bottom of the lower end cover 3 is connected to the water outlet pipe 5. The upper side wall of the lower end cover 3 is connected to the drain pipe 6 and the bracket 12;

[0028] The filter element 14 is installed inside the outer shell 1. A top baffle 10 is provided at the top of the filter element 14, and a bottom baffle 11 is provided at the bottom of the filter element 14.

[0029] The filter element 14 includes a magnetic rod 21. The magnetic rod 21 is sleeved with a filter layer assembly 23. The gap between the magnetic rod 21 and the filter layer assembly 23 is a water passage;

[0030] Only the upper end of the water passage passes through the top baffle 10 to communicate with the space inside the upper end cover 2, and only the lower end of the water passage passes through the bottom baffle 11 to communicate with the space inside the lower end cover 3 (for example: both the top baffle 10 and the bottom baffle 11 are provided with openings, the top of the filter layer assembly 23 is connected to the corresponding opening of the top baffle 10, the bottom of the filter layer assembly 23 is connected to the corresponding opening of the bottom baffle 11, and the magnetic rod 21 is located in the filter layer assembly 23), and the height of the top baffle 10 is higher than the height of the water inlet pipe 4, and the height of the drain pipe 6 is higher than the height of the bottom baffle 11; so that the pickling wastewater flowing in from the water inlet pipe 4 flows into the water passage from outside the filter layer assembly 23 to obtain produced water; during backwashing, the cleaning water flowing in from the backwash pipe 7 flows from the water passage to the outside of the filter layer assembly 23.

[0031] In this embodiment, the top baffle 10 is installed in the upper part of the outer shell 1, the height of the top baffle 10 is 5-10 cm higher than the height of the top outer wall of the water inlet pipe 4, the top baffle 10 is fixed inside the outer shell 1 by bolts, and the top baffle 10 is connected to the top outer wall of the filter element 14 (i.e., the outer wall of the filter layer assembly 23). When treating pickling wastewater, the operating pressure inside the outer shell 1 is 0.2-0.4 Mpa;

[0032] The bottom baffle 11 is installed inside the lower end cover 3, and the bottom baffle 11 plays a sealing role, separating the space below the bottom baffle 11 from the filter element 14 up and down, facilitating the collection of produced water below the bottom baffle 11 without being re-polluted by the filter cake layer formed around the filter element 14 located on the bottom baffle 11, etc. The height of the bottom of the outer wall of the drain pipe 6 is 3-5 cm higher than the height of the bottom baffle 11.

[0033] The filter element 14 includes a magnetic rod 21, and a filter layer assembly 23 is sleeved outside the magnetic rod 21. The filter layer assembly 23 sequentially includes a filter layer, a transition layer, and a support layer from outside to inside. The filter layer assembly 23 is arranged in multiple layers, which can improve the support strength of the filter layer assembly 23 and withstand higher operating pressures. A filter element water guide plate 22 is arranged between the filter layer assembly 23 and the magnetic rod 21. The filter element water guide plate 22 is arranged along the circumferential direction of the magnetic rod 21. The filter element water guide plate 22 is fixed by fixing plates arranged at both ends of the magnetic rod 21 (the fixing plate at the lower end of the magnetic rod 21 can be connected to the bottom end of the filter layer assembly 23 to support the magnetic rod 21). Water passing holes are arranged on the fixing plates, and the space between the water passing holes on the fixing plates and the filter element water guide plate 22 is communicated. The filter element water guide plate 22 provides further structural support for the water passing channel between the magnetic rod 21 and the filter layer assembly 23 in the filter element 14. The produced water during the wastewater treatment of the brightener or the cleaning water flow during backwashing flows in the space between the filter element water guide plates 22. In this embodiment, the filter layer assembly 23 sequentially includes a filter cloth, a screen mesh, and a fine grid from outside to inside. The filter cloth of the filter layer assembly 23 is a monofilament filter cloth, the material of the filter cloth is polypropylene, the filtration accuracy of the filter cloth is 5μm, the screen mesh and the fine grid are made of 316L stainless steel. Among them, the screen mesh is the transition layer and plays a role of transition support. The mesh size of the screen mesh is 100-200μm; the fine grid is the support layer and plays a role of support. The mesh size of the fine grid is 1-2mm. The magnetic rod 21 is made of neodymium iron boron, the surface magnetic induction intensity of the magnetic rod 21 is greater than 3000GS, the width of the filter element water guide plate 22 is 10-20mm, the diameter of a single filter element 14 is 6-10cm, and the length is 1.0-1.5m.

[0034] To facilitate the removal of the magnetic rod 21 in the filter element 14, so as to remove pollutants such as zinc iron powder adsorbed by the magnetic rod 21, an opening is provided at the corresponding position of the fixing plate at the top of the magnetic rod 21. A connecting portion 26 is arranged at the top of the magnetic rod 21. The connecting portion 26 passes through the opening of the fixing plate at the top of the magnetic rod 21 and is connected to the pulling-out device 25.

[0035] To facilitate the replacement of the filter layer assembly 23 when the water permeability of the filter element 14 seriously decreases and cannot be restored. The top of the filter layer assembly 23 is connected with a diversion sleeve 27. The diversion sleeve 27 is sleeved outside the connecting portion 26. Water passing holes are arranged on the side wall of the diversion sleeve 27. A gap is left between the inner wall of the diversion sleeve 27 and the connecting portion 26 as a water diversion channel. The water diversion channel is communicated with the water passing channel, so that the cleaning water flow during backwashing can sequentially pass through the water passing holes on the side wall of the diversion sleeve 27 and enter the water passing channel between the magnetic rod 21 and the filter layer assembly 23 through the water diversion channel;

[0036] The bottom of the filter layer assembly 23 is connected to the bottom casing 24, such that the upper end of the bottom casing 24 is in communication with the water passage. An outlet casing 13 is provided on the bottom baffle 11, and the lower part of the bottom casing 24 is detachably connected to the outlet casing 13. In this embodiment, the outlet casing 13 is inserted into the bottom casing 24, and the space at the bottom of the bottom baffle 11 becomes the water production collection area of the filter element 14. The water production collection area is in communication with the water passage of the filter element 14 through the outlet casing 13.

[0037] Furthermore, to improve the sealing performance of the top baffle 10, such that the cleaning water flow flowing in from the backwash pipe 7 flows out of the water passage between the magnetic rod 21 and the filter layer assembly 23 to the outside of the filter layer assembly 23, sealing rings are provided on the top baffle 10 around the periphery of each diversion casing 27; a sealing ring is sleeved between the outlet casing 13 and the bottom casing 24 for making the bottom casing 24 and the bottom baffle 11 be hermetically connected; the filter element 14 is evenly fixed in multiple circles along the circumferential direction between the top baffle 10 and the bottom baffle 11.

[0038] Furthermore, there are multiple inlet pipes 4 which are evenly arranged along the circumference of the housing 1, and the multiple inlet pipes 4 intake water simultaneously, thereby ensuring the uniformity of water intake. In this embodiment, the housing 1 intakes water from two inlet pipes 4 simultaneously, and the inlet pipes 4 are symmetrically arranged on both sides of the housing 1.

[0039] Valves are installed on the inlet pipe 4, the backwash pipe 7, the drain pipe 6 and the outlet pipe 5, and the valves are pneumatic valves or electric valves. When performing waste water treatment of the skin pass mill, the valves on the inlet pipe 4 and the outlet pipe 5 are opened, and the valves on the drain pipe 6 and the backwash pipe 7 are closed. The waste water of the skin pass mill enters the housing 1 from the inlet pipe 4, and after being filtered by the filter element 14, the produced water is discharged from the outlet pipe 5; when performing backwashing, the valves on the inlet pipe 4 and the outlet pipe 5 are closed, and the valves on the drain pipe 6 and the backwash pipe 7 are opened. The cleaning water flow enters the housing 1 from the backwash pipe 7, and the waste water after backwashing is discharged from the drain pipe 6.

[0040] Furthermore, as a preference of this embodiment, when performing backwashing, the inlet pipe 4 is closed, the valves on the outlet pipe 5, the drain pipe 6 and the backwash pipe 7 are opened, and the valve of the outlet pipe 5 is connected to external compressed air, and air washing is performed simultaneously to enhance the cleaning effect.

[0041] Furthermore, a pressure sensor is provided on the upper end cap 2 for monitoring the inlet water pressure of the backwash pipe 7. When the monitored inlet water pressure of the backwash pipe 7 exceeds the preset value, the inlet water pressure of the backwash pipe 7 is reduced by adjusting the valve on the backwash pipe 7. In this embodiment, the inlet water pressure of the backwash pipe 7 is less than 0.1 Mpa.

[0042] The working principle of this embodiment is as follows:

[0043] During specific operation, the waste water of the polishing machine enters the outer shell 1 from the two water inlet pipes 4, and the operating pressure in the outer shell 1 is controlled at 0.2-0.4Mpa. The zinc powder and iron powder in the waste water of the polishing machine are intercepted by the filter layer assembly 23 of the filter element 14, and a filter cake layer is formed outside the filter element 14. The fine zinc powder and iron powder that are not intercepted pass through the filter layer assembly 23 and are attracted by the magnetic rod 21. The produced water passes through the water channel, the bottom sleeve 24, the water outlet sleeve 13, the bottom baffle 11 and the lower end cover 3 in sequence and is discharged from the water outlet pipe 5.

[0044] During operation, the filter element 14 is backwashed periodically, and the water inlet pressure of the backwash is controlled not to exceed 0.1Mpa. During backwashing, the cleaning water flow is input from the backwash pipe 7 to the internal space of the upper end cover 2, and then passes through the water inlet, water diversion channel, and water passage on the side wall of the guide sleeve 27, and then penetrates from the inside of the filter layer assembly 23 to the outside of the filter layer assembly 23. Due to the low reverse support strength of the filter layer assembly 23, the pressure during backwashing cannot be too large, otherwise the filter layer assembly 23 will be damaged. There is no need to pull out the magnetic rod 21 during backwashing. The backwashing effect is mainly affected by the backwashing flow rate. The filter cake layer outside the filter layer assembly 23 will gradually fall off during the backwashing process. In order to strengthen backwashing, compressed air can be introduced into the outlet pipe 5 during backwashing, and the pollutants after backwashing (the pollutants mainly include the filter cake layer and other substances intercepted by the filter layer assembly 23) are discharged from the outer shell 1 through the drain pipe 6. After running for a period of time, the pressure filter is stopped (that is, the valves corresponding to the water inlet pipe 4, the water outlet pipe 5, the drain pipe 6 and the backwash pipe 7 are closed), the quick-connect flange 9 is opened, and the magnetic rod 21 is pulled out from the filter layer assembly 23 by using the pull-out device 25, the zinc and iron powder on the magnetic rod 21 is cleaned, and then it is reinserted into the filter layer assembly 23 to resume operation. During operation, the produced water filtered by the filter element 14 is discharged from the outlet pipe 5. When the water permeability of the filter element 14 is severely reduced and cannot be restored, the guide sleeve 27 can be pulled out and the filter layer assembly 23 is also replaced.

[0045] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the idea and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A pressure filter for treating wastewater from a skin-finishing machine, comprising a housing (1), characterized in that: The outer shell (1) is in the shape of a cylinder that is connected from top to bottom. The top open end of the outer shell (1) is detachably connected to the upper end cover (2). The top of the upper end cover (2) is connected to the backwash pipe (7). The upper part of the outer shell (1) is connected to the water inlet pipe (4). The bottom open end of the outer shell (1) is detachably connected to the lower end cover (3). The bottom of the lower end cover (3) is connected to the water outlet pipe (5). The upper side wall of the lower end cover (3) is connected to the drain pipe (6). A filter element (14) is installed inside the housing (1), a top baffle (10) is arranged at the top of the filter element (14), and a bottom baffle (11) is arranged at the bottom of the filter element (14); The filter element (14) comprises a magnetic rod (21), a filter layer assembly (23) is disposed outside the magnetic rod (21), and a water passage is left between the magnetic rod (21) and the filter layer assembly (23); Only the upper end of the water passage passes through the top baffle (10) to communicate with the space in the upper end cover (2), and only the lower end of the water passage passes through the bottom baffle (11) to communicate with the space in the lower end cover (3), and the height of the top baffle (10) is higher than the height of the water inlet pipe (4), and the height of the drain pipe (6) is higher than the height of the bottom baffle (11).

2. A pressure filter for treating wastewater from a skin-finishing machine according to claim 1, characterized in that: The filter layer assembly (23) comprises, from the outside to the inside, a filter layer, a transition layer and a support layer.

3. The pressure filter for treating wastewater from a skin-finishing machine according to claim 1, characterized in that: A filter element water guide plate (22) is arranged between the filter layer assembly (23) and the magnetic rod (21); the filter element water guide plate (22) is arranged along the circumference of the magnetic rod (21); the filter element water guide plate (22) is fixed by fixing plates arranged at both ends of the magnetic rod (21); a water outlet is arranged on the fixing plate; the water outlet on the fixing plate is in communication with the space between the filter element water guide plate (22).

4. The pressure filter for treating wastewater from a skin-finishing machine according to claim 1, characterized in that: The fixing plate at the top of the magnetic bar (21) is provided with openings at positions corresponding to the magnetic bar (21), and a connecting portion (26) is provided at the top of the magnetic bar (21), and the connecting portion (26) passes through the opening of the fixing plate at the top of the magnetic bar (21) and is connected to the extraction device (25).

5. The pressure filter for treating wastewater from a skin-finishing machine according to claim 1, characterized in that: The top of the filter layer assembly (23) is connected to a flow guide sleeve (27), which is sleeved outside the connecting portion (26), and a water outlet is provided on the side wall of the flow guide sleeve (27). A water diversion channel is left between the inner wall of the flow guide sleeve (27) and the connecting portion (26), and the water diversion channel is connected to the water outlet channel; The bottom of the filter layer assembly (23) is connected to a bottom sleeve (24), a water outlet sleeve (13) is arranged on the bottom baffle (11), and the lower part of the bottom sleeve (24) is detachably connected to the water outlet sleeve (13).

6. The pressure filter for treating wastewater from a skin-finishing machine according to claim 1, characterized in that: The water inlet pipes (4) are multiple and are evenly arranged along the circumference of the outer shell (1), and the multiple water inlet pipes (4) take in water simultaneously.

7. The pressure filter for treating wastewater from a skin-finishing machine according to claim 1, characterized in that: Valves are installed on the water inlet pipe (4), the backwash pipe (7), the drain pipe (6) and the water outlet pipe (5).

8. The pressure filter for treating wastewater from a skin-finishing machine according to claim 7, characterized in that: The valve of the water outlet pipe (5) is connected to external compressed air.

9. The pressure filter for treating wastewater from a skin-finishing machine according to claim 1, characterized in that: A pressure sensor is arranged on the upper end cover (2).

10. The pressure filter for treating wastewater from a skin-finishing machine according to claim 5, characterized in that: A sealing ring is arranged on the top baffle (10) at the periphery of each flow guide sleeve (27); and a sealing ring is sleeved between the water outlet sleeve (13) and the bottom sleeve (24).

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