Emulsion liquid supplementing device

Abstract

The utility model provides an emulsified liquid supplementing device which comprises a liquid storage tank, a liquid pump, a liquid pump, a liquid pump, a liquid pump, a liquid pump, a liquid pump, a liquid pump, a liquid pump, a liquid pump, a liquid pump, a liquid pump, a liquid pump, a liquid pump, a liquid pump, a liquid pump and a liquid pump, the recovery box is communicated with the liquid outlet and used for recovering the emulsion in the liquid storage box, a back pressure valve is arranged between the recovery box and the liquid storage box, when the pressure value of the emulsion in the liquid storage box is larger than the pressure value set by the back pressure valve, the back pressure valve is opened, the emulsion in the liquid storage cavity can enter the recovery box, and the emulsion in the liquid storage cavity can enter the recovery box; when the pressure value of the emulsion in the liquid storage tank is smaller than the set pressure value of the back pressure valve, the back pressure valve is switched off; and the first filtering assembly is arranged in the liquid storage box, and the emulsion in the liquid storage box can be filtered by the first filtering assembly and then is introduced into the recycling box. By means of the technical scheme, the problem that in the prior art, impurities in emulsified liquid easily affect use of the back pressure valve can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic equipment, in particular to an emulsion replenishing device. Background Art

[0002] In the processes of coal dropping, coal loading, transportation, support and goaf treatment in the comprehensive mining face underground in coal mines, hydraulic equipment is used in most of the processes. When multiple hydraulic equipment are coordinated, an emulsion pump station will be set up as the power source of the hydraulic equipment. The emulsion pump station mainly includes a liquid storage tank and an oil pump. The emulsion in the liquid storage tank enters the hydraulic equipment through the oil pump, and the emulsion refluxed from the hydraulic equipment will return to the liquid storage tank to wait for reuse. In the circulation process of this emulsion, during the asynchronous start and stop process of multiple hydraulic equipment, the emulsion in the liquid storage tank may be insufficient. In the prior art, a replenishing device is usually set up to replenish the emulsion in the liquid storage tank, but the refluxed emulsion may cause the emulsion in the liquid storage tank to overflow, resulting in waste and pollution to the surrounding environment.

[0003] In order to overcome the problem of emulsion overflow in the prior art, a back pressure valve is usually installed on the liquid storage tank. When the emulsion in the liquid storage tank exceeds the set pressure value, the back pressure valve opens to discharge the excess emulsion in the liquid storage tank. However, the emulsion is prone to accumulate impurities such as sand or rust during operation, which will cause the impurities to be easily deposited inside the back pressure valve when the emulsion passes through the back pressure valve, affecting the service life of the back pressure valve and reducing the accuracy of using the back pressure valve, resulting in the emulsion being unable to be discharged from the liquid storage tank in time, resulting in waste, or excessive discharge from the liquid storage tank, resulting in insufficient fluid supply to the hydraulic equipment. Utility Model Content

[0004] The utility model provides an emulsion replenishing device to solve the problem in the prior art that impurities in the emulsion easily affect the use of a back pressure valve.

[0005] The utility model provides an emulsion replenishing device, which comprises: a liquid storage tank, which has a liquid storage cavity, and a liquid outlet, a liquid discharge port and a liquid return port are arranged on the side wall of the liquid storage tank, the liquid outlet is used to be connected to an oil pump, and the liquid return port is used to be connected to a hydraulic device for recovering the emulsion; a recovery box, which is connected to the liquid discharge port, and the recovery box is used to recover the emulsion in the liquid storage tank, and a back pressure valve is arranged between the recovery box and the liquid storage tank, when the pressure value of the emulsion in the liquid storage tank is greater than the pressure value set by the back pressure valve, the back pressure valve opens, and the emulsion in the liquid storage cavity can enter the recovery box, and when the pressure value of the emulsion in the liquid storage tank is less than the pressure value set by the back pressure valve, the back pressure valve is disconnected; a first filter component is arranged in the liquid storage tank, and the emulsion in the liquid storage tank can be filtered by the first filter component and then passed into the recovery box.

[0006] Furthermore, the first filter component is located between the liquid return port and the liquid discharge port and between the liquid return port and the liquid outlet port to separate the liquid storage chamber into a liquid return chamber, a liquid discharge chamber and a liquid outlet chamber. The liquid return port is connected to the liquid return chamber, the liquid discharge port is connected to the liquid discharge chamber, and the liquid outlet port is connected to the liquid outlet chamber. The first filter component can filter the emulsion discharged from the liquid return port.

[0007] Furthermore, the liquid storage tank has a first end and a second end that are relatively arranged, the liquid outlet is arranged at the first end, the return liquid port and the liquid discharge port are arranged at the second end, and the return liquid port is located above the liquid discharge port, and the first filter assembly includes a first filter screen and a second filter screen that are connected to each other, the first filter screen extends along the width direction of the liquid storage tank and is vertically arranged between the first end and the second end, and the second filter screen is horizontally arranged between the second end and the first filter screen and is located between the return liquid port and the liquid discharge port.

[0008] Furthermore, the emulsion replenishing device also includes a connecting pipe, one end of which is connected to the recovery box, and the other end of the connecting pipe is passed through the discharge port. A guide slope is provided at the bottom of the liquid storage chamber, and the height of the guide slope gradually decreases from the second end to the first end. The port of the connecting pipe away from the recovery box is set through the guide slope.

[0009] Furthermore, the first filter net includes a first filter part and a second filter part connected in sequence, the first filter part is arranged close to the second end, the second filter part is arranged along the horizontal direction, and the first filter part is arranged parallel to the guide slope.

[0010] Furthermore, a first limit block is provided on the inner wall of the liquid storage tank, one side of the second filter screen is abutted against the first limit block, and a clamping assembly is provided on the other side of the second filter screen, and the clamping assembly includes: a shell, one end of the shell is abutted against the inner wall of the liquid storage tank; a pressure rod, the pressure rod is movably inserted in the shell, and a second limit block is provided at one end of the pressure rod close to the second filter screen, and the second limit block cooperates with the first limit block to limit the displacement of the second filter screen in the liquid storage tank; a spring, the spring is provided between the pressure rod and the shell, and the spring is used to provide an elastic force to the pressure rod toward the second filter screen.

[0011] Furthermore, the emulsion replenishing device also includes a replenishing tank, which is connected to the liquid storage tank and is used to replenish the emulsion into the liquid storage cavity. A control unit is provided between the replenishing tank and the liquid storage tank to control the replenishing tank to replenish the emulsion into the liquid storage cavity.

[0012] Furthermore, the control unit includes: a liquid level sensor, which is arranged on the inner wall of the liquid storage tank; an electric control valve, which is arranged between the liquid replenishing tank and the liquid storage tank; and a controller, which is electrically connected to the liquid level sensor and the electric control valve respectively, and the controller can control the opening of the electric control valve according to the data detected by the liquid level sensor.

[0013] Furthermore, a second filter assembly is provided between the recovery tank and the back pressure valve for filtering the emulsion discharged by the back pressure valve.

[0014] Furthermore, the second filter assembly includes: a connecting box, a side wall of which is provided with an opening, the connecting box is connected to the recovery box and the back pressure valve respectively; a third filter net, the third filter net is detachably inserted in the opening and can cover the flow path of the emulsion in the connecting box.

[0015] By applying the technical solution of the utility model, the emulsion in the liquid storage tank can be passed into the hydraulic cylinder of the hydraulic equipment through the liquid outlet under the drive of the oil pump, and the emulsion flowing out of the hydraulic equipment can flow back to the liquid storage tank through the return port to complete the circulation of the emulsion. In this circulation process, the opening pressure of the back pressure valve can be preset. When there is a lot of emulsion in the liquid storage tank and the pressure value of the emulsion is greater than the pressure value set by the back pressure valve, the back pressure valve opens, and the emulsion enters the recovery tank through the back pressure valve for recovery, preventing the emulsion from overflowing and reducing waste. In this process, the first filter component can filter the emulsion that has not been passed into the back pressure valve, preventing impurities in the emulsion from affecting the use accuracy of the back pressure valve, ensuring the use performance of the back pressure valve, and ensuring that the back pressure valve can respond to the pressure of the liquid storage chamber in time, thereby preventing the emulsion from being unable to be discharged from the liquid storage tank in time and causing waste, or preventing the emulsion from being discharged from the liquid storage tank too much and causing insufficient fluid supply to the hydraulic equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0017] Figure 1 The schematic diagram of the structure of the emulsion liquid supply device provided by the utility model is shown;

[0018] Figure 2 A structural schematic diagram showing another perspective of the emulsion supply device provided by the utility model;

[0019] Figure 3 A cross-sectional view of the emulsion supply device provided by the utility model is shown;

[0020] Figure 4 A cross-sectional view of the clamping assembly provided by the utility model is shown.

[0021] The above drawings include the following reference numerals:

[0022] 10. Liquid storage tank; 101. Liquid outlet chamber; 102. Liquid discharge chamber; 103. Liquid return chamber;

[0023] 11. Liquid outlet; 12. Liquid discharge port; 13. Liquid return port; 14. Oil pump; 15. Guide slope; 16. First limit block;

[0024] 20. Recovery box; 21. Back pressure valve; 22. Connecting pipe;

[0025] 30. A first filter assembly;

[0026] 31, first filter screen; 311, first filter section; 312, second filter section;

[0027] 32. Second filter;

[0028] 40. Clamping assembly; 41. Housing; 42. Press rod; 43. Second limit block; 44. Spring;

[0029] 50. Liquid replenishing tank; 51. Liquid level sensor; 52. Electric control valve; 53. Controller;

[0030] 60. Second filter assembly; 61. Connecting box; 62. Third filter screen. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0032] like Figures 1 to 3 As shown, the embodiment of the utility model provides an emulsion replenishing device, which includes a liquid storage tank 10, a recovery tank 20 and a first filter assembly 30. The liquid storage tank 10 has a liquid storage cavity, and a liquid outlet 11, a liquid discharge port 12 and a liquid return port 13 are arranged on the side wall of the liquid storage tank 10. The liquid outlet 11 is used to connect with an oil pump 14, and the liquid return port 13 is used to connect with a hydraulic device for recovering emulsion. The recovery tank 20 is connected with the liquid discharge port 12, and the recovery tank 20 is used to recover the emulsion in the liquid storage tank 10. A back pressure valve 21 is arranged between the recovery tank 20 and the liquid storage tank 10. When the pressure value of the emulsion in the liquid storage tank 10 is greater than the pressure value set by the back pressure valve 21, the back pressure valve 21 opens, and the emulsion in the liquid storage cavity can enter the recovery tank 20. When the pressure value of the emulsion in the liquid storage tank 10 is less than the pressure value set by the back pressure valve 21, the back pressure valve 21 is disconnected. The first filter assembly 30 is disposed in the liquid storage tank 10 , and the emulsion in the liquid storage tank 10 can be filtered by the first filter assembly 30 and then passed into the recovery tank 20 .

[0033] By applying the technical solution of the utility model, the emulsion in the liquid storage tank 10 can be passed into the hydraulic cylinder of the hydraulic equipment through the liquid outlet 11 under the drive of the oil pump 14, and the emulsion flowing out of the hydraulic equipment can flow back to the liquid storage tank 10 through the liquid return port 13, completing the circulation of the emulsion. During this cycle, the opening pressure of the back-pressure valve 21 can be preset. When there is a lot of emulsion in the liquid storage tank 10 and the pressure value of the emulsion is greater than the pressure value set by the back-pressure valve 21, the back-pressure valve 21 opens, and the emulsion enters the recovery tank 20 through the back-pressure valve 21 for recovery, thereby preventing the emulsion from overflowing and reducing waste. During this process, the first filter component 30 can filter the emulsion that has not passed into the back-pressure valve 21, to prevent impurities in the emulsion from affecting the use accuracy of the back-pressure valve 21, to ensure the use performance of the back-pressure valve 21, and to ensure that the back-pressure valve 21 can respond to the pressure of the liquid storage chamber in time, thereby preventing the emulsion from being unable to be discharged from the liquid storage tank in time and causing waste, or preventing the emulsion from being discharged too much from the liquid storage tank and causing insufficient fluid supply to the hydraulic equipment.

[0034] Furthermore, the first filter assembly 30 is located between the liquid return port 13 and the liquid discharge port 12 and between the liquid return port 13 and the liquid outlet port 11 to separate the liquid storage chamber into a liquid return chamber 103, a liquid discharge chamber 102 and a liquid outlet chamber 101. The liquid return port 13 is connected to the liquid return chamber 103, the liquid discharge port 12 is connected to the liquid discharge chamber 102, and the liquid outlet port 11 is connected to the liquid outlet chamber 101. The first filter assembly 30 can filter the emulsion discharged from the liquid return port 13. Through the above-mentioned arrangement, when the emulsion flows back to the liquid storage chamber through the liquid return port 13 and flows to the liquid outlet 11 through the liquid storage chamber during the emulsion circulation process, the emulsion will flow from the liquid return chamber 103 to the liquid outlet chamber 101. During this process, the first filter component 30 can filter the emulsion once. When the emulsion flows back to the liquid storage chamber through the liquid return port 13 again and flows to the back pressure valve 21 through the liquid discharge port 12, the emulsion will flow from the liquid return chamber 103 to the liquid discharge chamber 102. During this process, the first filter component 30 will filter the emulsion again to enhance the filtering effect of the first filter component 30 and further filter the impurities in the emulsion passing through the back pressure valve 21.

[0035] Specifically, the liquid storage tank 10 has a first end and a second end that are relatively arranged, the liquid outlet 11 is arranged at the first end, the liquid return port 13 and the liquid discharge port 12 are arranged at the second end, and the liquid return port 13 is located above the liquid discharge port 12, and the first filter assembly 30 includes a first filter screen 31 and a second filter screen 32 that are connected to each other, the first filter screen 31 extends along the width direction of the liquid storage tank 10, and is vertically arranged between the first end and the second end, and the second filter screen 32 is arranged between the second end and the first filter screen 31 along the horizontal direction, and is located between the liquid return port 13 and the liquid discharge port 12. Through the above arrangement, when the emulsion passes through the liquid return port 13, it will naturally flow to the liquid discharge chamber 102 and the liquid outlet chamber 101 through the first filter screen 31 under the action of gravity, so as to filter the emulsion, prevent part of the emulsion from not passing through the first filter assembly 30, and ensure the filtering effect of the emulsion.

[0036] Specifically, the end of the first filter screen 31 can be connected to the second filter screen 32 by a fastener, such as a combination of a gasket and a bolt, etc. The specific form of the fastener is not limited in the present application, as long as a fastening connection can be achieved.

[0037] In a specific embodiment of the present application, the emulsion replenishing device further includes a connecting pipe 22, one end of which is connected to the recovery tank 20, and the other end of the connecting pipe 22 is inserted into the discharge port 12. A diversion slope 15 is provided at the bottom of the liquid storage chamber, and the height of the diversion slope 15 gradually decreases from the second end to the first end. The port of the connecting pipe 22 away from the recovery tank 20 is provided with the diversion slope 15. Through the above-mentioned arrangement, the diversion slope 15 can cooperate with the connecting pipe 22 to achieve the diversion of the emulsion. When the back pressure valve 21 is opened, the diversion slope 15 can accelerate the discharge speed of the emulsion; and when there are impurities of larger diameter mixed inside the liquid storage tank 10, the impurities can be prevented from clogging the connecting pipe 22 by providing the diversion slope 15.

[0038] Furthermore, the first filter net 31 includes a first filter part 311 and a second filter part 312 connected in sequence, the first filter part 311 is arranged near the second end, the second filter part 312 is arranged in the horizontal direction, and the first filter part 311 is arranged parallel to the guide slope 15. Through the above arrangement, the first filter part 311 is arranged obliquely in the accommodating cavity, so that the filtering area of ​​the first filter part 311 can be increased, and the filtering effect of the first filter assembly 30 can be improved.

[0039] In a specific embodiment of the present application, the inner wall of the liquid storage tank 10 is provided with a first limit block 16, one side of the second filter screen 32 is in contact with the first limit block 16, and the other side of the second filter screen 32 is provided with a pressing assembly 40, referring to Figure 4As shown, the pressing assembly 40 includes a housing 41, a pressing rod 42 and a spring 44. One end of the housing 41 abuts against the inner wall of the liquid storage tank 10, the pressing rod 42 is movably inserted in the housing 41, and a second stop block 43 is provided at one end of the pressing rod 42 close to the second filter screen 32. The second stop block 43 cooperates with the first stop block 16 to limit the displacement of the second filter screen 32 in the liquid storage tank 10. The spring 44 is provided between the pressing rod 42 and the housing 41, and is used to provide an elastic force to the pressing rod 42 toward the second filter screen 32. Through the above-mentioned arrangement, the first limit block 16 and the second limit block 43 can cooperate together to limit the second filter 32, thereby preventing the second filter 32 from being displaced under the influence of the emulsion, and ensuring the stability of the installation of the second filter 32 in the liquid storage tank 10; and, through the cooperation of the pressure rod 42 and the spring 44, the position of the second limit block 43 can be easily adjusted, which facilitates the installation and disassembly of the second filter 32 and the cleaning and maintenance of the second filter 32.

[0040] Specifically in the present application, two first limiting blocks 16 may be relatively arranged along the width direction of the second filter screen 32 , and correspondingly, two clamping assemblies 40 may also be correspondingly arranged to further improve the limiting effect on the second filter screen 32 .

[0041] Furthermore, the emulsion replenishing device further includes a replenishing tank 50, which is connected to the liquid storage tank 10, and is used to replenish the emulsion into the liquid storage cavity. A control unit is provided between the replenishing tank 50 and the liquid storage tank 10 to control the replenishing tank 50 to replenish the emulsion into the liquid storage cavity. Through the above arrangement, the control unit can control the replenishing tank 50 to pass the emulsion into the liquid storage cavity to prevent the emulsion from being insufficient.

[0042] Specifically, the control unit includes a liquid level sensor 51, an electric control valve 52 and a controller 53. The liquid level sensor 51 is arranged on the inner wall of the liquid storage tank 10, the electric control valve 52 is arranged between the liquid replenishing tank 50 and the liquid storage tank 10, and the controller 53 is electrically connected to the liquid level sensor 51 and the electric control valve 52 respectively. The controller 53 can control the opening of the electric control valve 52 according to the data detected by the liquid level sensor 51. Through the above arrangement, when the liquid level of the emulsion in the liquid storage tank 10 is low, the controller 53 can control the electric control valve 52 to open or adaptively increase the opening of the electric control valve 52, thereby replenishing the emulsion in the liquid storage tank 10. When the liquid level of the emulsion in the liquid storage tank 10 is high, the controller 53 can control the electric control valve 52 to close or adaptively reduce the opening of the electric control valve 52, so that less emulsion enters the liquid storage tank 10 or stops replenishing the emulsion in the liquid storage tank 10, so as to meet the use requirements of the hydraulic device. In the present application, the controller 53 may be in the form of automatic control to achieve automatic liquid replenishment of the liquid storage tank 10, or may be in the form of manual control to facilitate adjustment.

[0043] Furthermore, a second filter assembly 60 is provided between the recovery box 20 and the back pressure valve 21, for filtering the emulsion discharged by the back pressure valve 21. Through the above arrangement, the second filter assembly 60 can filter the emulsion passing through the back pressure valve 21 again, reduce the content of impurities in the emulsion entering the recovery box 20, and ensure the quality of the recovered emulsion.

[0044] In a specific embodiment of the present application, the second filter assembly 60 includes a connecting box 61 and a third filter screen 62. An opening is provided on the side wall of the connecting box 61, and the connecting box 61 is respectively connected to the recovery box 20 and the back pressure valve 21. The third filter screen 62 is detachably inserted in the opening and can cover the flow path of the emulsion in the connecting box 61. Through the above arrangement, the filtering effect of the third filter screen 62 on the emulsion can be guaranteed, and the third filter screen 62 and the connecting box 61 are plugged together, which can facilitate the removal and installation of the third filter screen 62, so as to facilitate the cleaning and maintenance of the third filter screen 62.

[0045] Furthermore, in the present application, the filtering accuracy of the second filter component 60 can be set to be greater than the filtering accuracy of the first filter component 30 to achieve graded filtration, thereby ensuring the filtering efficiency while ensuring the filtering effect.

[0046] Furthermore, a plurality of third filter screens 62 may be disposed in the connecting box 61 , and the plurality of third filter screens 62 are disposed at intervals along the flow direction of the emulsion to further improve the filtering effect of the second filter assembly 60 .

[0047] Specifically, the third filter screen 62 can be fastened to the side wall of the connecting box 61 by means of a connecting plate and fastening bolts. The connecting plate covers the opening, and a sealing ring is provided on the side of the connecting plate facing the opening to ensure the sealing effect of the connecting box 61.

[0048] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0049] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0050] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0051] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0052] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0053] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An emulsion replenishing device, characterized in that: The emulsion replenishing device comprises: A liquid storage box (10) has a liquid storage cavity, and a liquid outlet (11), a liquid discharge port (12) and a liquid return port (13) are arranged on the side wall of the liquid storage box (10), the liquid outlet (11) is used to be connected to an oil pump (14), and the liquid return port (13) is used to be connected to a hydraulic device for recovering emulsion; a recovery tank (20) connected to the liquid discharge port (12), the recovery tank (20) being used to recover the emulsion in the liquid storage tank (10), a back pressure valve (21) being provided between the recovery tank (20) and the liquid storage tank (10), when the pressure value of the emulsion in the liquid storage tank (10) is greater than the pressure value set by the back pressure valve (21), the back pressure valve (21) is opened, and the emulsion in the liquid storage chamber can enter the recovery tank (20), and when the pressure value of the emulsion in the liquid storage tank (10) is less than the pressure value set by the back pressure valve (21), the back pressure valve (21) is disconnected; The first filter assembly (30) is arranged in the liquid storage tank (10), and the emulsion in the liquid storage tank (10) can be filtered by the first filter assembly (30) and then passed into the recovery tank (20).

2. The emulsion replenishing device according to claim 1, characterized in that: The first filter assembly (30) is located between the liquid return port (13) and the liquid discharge port (12) and between the liquid return port (13) and the liquid outlet port (11) to separate the liquid storage chamber into a liquid return chamber (103), a liquid discharge chamber (102) and a liquid outlet chamber (101); the liquid return port (13) is in communication with the liquid return chamber (103), the liquid discharge port (12) is in communication with the liquid discharge chamber (102), and the liquid outlet port (11) is in communication with the liquid outlet chamber (101); the first filter assembly (30) is capable of filtering the emulsion discharged from the liquid return port (13).

3. The emulsion replenishing device according to claim 2, characterized in that: The liquid storage tank (10) has a first end and a second end which are arranged opposite to each other, the liquid outlet (11) is arranged at the first end, the liquid return port (13) and the liquid discharge port (12) are arranged at the second end, and the liquid return port (13) is located above the liquid discharge port (12); the first filter assembly (30) comprises a first filter screen (31) and a second filter screen (32) which are connected to each other, the first filter screen (31) extending along the width direction of the liquid storage tank (10) and being vertically arranged between the first end and the second end, and the second filter screen (32) being arranged between the second end and the first filter screen (31) along the horizontal direction, and being located between the liquid return port (13) and the liquid discharge port (12).

4. The emulsion replenishing device according to claim 3, characterized in that: The emulsion replenishing device also includes a connecting pipe (22), one end of which is connected to the recovery box (20), and the other end of which is inserted into the discharge port (12). A guide slope (15) is provided at the bottom of the liquid storage chamber, and the height of the guide slope (15) gradually decreases from the second end to the first end. The port of the connecting pipe (22) on the side away from the recovery box (20) is inserted out of the guide slope (15).

5. The emulsion replenishing device according to claim 4, characterized in that: The first filter net (31) comprises a first filter portion (311) and a second filter portion (312) connected in sequence, the first filter portion (311) being arranged close to the second end, the second filter portion (312) being arranged in a horizontal direction, and the first filter portion (311) being arranged parallel to the guide slope (15).

6. The emulsion replenishing device according to claim 3, characterized in that: The inner wall of the liquid storage tank (10) is provided with a first limit block (16), one side of the second filter screen (32) is in contact with the first limit block (16), and the other side of the second filter screen (32) is provided with a clamping assembly (40), the clamping assembly (40) comprising: A shell (41), one end of the shell (41) abutting against the inner wall of the liquid storage tank (10); A pressure rod (42), the pressure rod (42) being movably inserted in the housing (41), and a second limit block (43) being provided at one end of the pressure rod (42) close to the second filter screen (32), the second limit block (43) cooperating with the first limit block (16) to limit the displacement of the second filter screen (32) in the liquid storage tank (10); A spring (44), wherein the spring (44) is arranged between the pressure rod (42) and the housing (41), and the spring (44) is used to provide an elastic force to the pressure rod (42) toward the second filter screen (32).

7. The emulsion replenishing device according to claim 1, characterized in that: The emulsion replenishing device further comprises a replenishing tank (50), wherein the replenishing tank (50) is connected to the liquid storage tank (10), and the replenishing tank (50) is used to replenish the emulsion into the liquid storage cavity. A control unit is provided between the replenishing tank (50) and the liquid storage tank (10) to control the replenishing tank (50) to replenish the emulsion into the liquid storage cavity.

8. The emulsion replenishing device according to claim 7, characterized in that: The control unit comprises: A liquid level sensor (51), the liquid level sensor (51) being arranged on the inner wall of the liquid storage tank (10); An electrically controlled valve (52), the electrically controlled valve (52) being arranged between the liquid replenishing tank (50) and the liquid storage tank (10); A controller (53), wherein the controller (53) is electrically connected to the liquid level sensor (51) and the electric control valve (52) respectively, and the controller (53) can control the opening of the electric control valve (52) according to data detected by the liquid level sensor (51).

9. The emulsion replenishing device according to claim 1, characterized in that: A second filter assembly (60) is provided between the recovery box (20) and the back pressure valve (21) and is used to filter the emulsion discharged from the back pressure valve (21).

10. The emulsion replenishing device according to claim 9, characterized in that: The second filter assembly (60) comprises: A connecting box (61), wherein an opening is provided on a side wall of the connecting box (61), and the connecting box (61) is respectively connected to the recovery box (20) and the back pressure valve (21); A third filter screen (62) is detachably inserted in the opening and is capable of covering the flow path of the emulsion in the connecting box (61).

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