Waste residue filtering device for medium-speed wire cutting

Abstract

The invention relates to the technical field of machining, and discloses a medium-speed wire cutting waste residue filtering device which comprises a settling box, a filtering box, filter paper, a supply pump and a filter paper replacing assembly, the filter paper replacing assembly is used for replacing the filter paper in the filtering box, and the filter paper replacing assembly comprises a paper releasing roller and a paper collecting roller. The invention provides a waste residue filtering device for medium-speed wire cutting. The problems that according to an existing filtering device, time consumed for replacing a filter element is long, and shutdown is needed when the filter element is replaced can be solved or at least relieved.

Description

Technical Field

[0001] The present invention relates to the technical field of machining, and particularly relates to a waste residue filtering device for medium-speed wire electrical discharge machining (WEDM). Background Art

[0002] Wire electrical discharge machining is a commonly used workpiece machining method in industrial production and has a wide range of applications in the manufacturing industry. Due to the discharge effect between the workpiece and the conductive wire, the part of the workpiece in contact with the conductive wire is rapidly oxidized and corroded and is discharged with the coolant. In wire electrical discharge machining, the coolant mainly plays the roles of cooling, chip removal, and insulation. During the machining process, the waste residue generated by the workpiece circulates with the coolant. When the waste chips in the coolant accumulate to a certain proportion, these waste chips will accumulate together and adhere to the coolant delivery pipeline of the wire electrical discharge machining, which is extremely likely to cause blockage of the coolant delivery pipeline. At the same time, the waste residue doped in the coolant also plays a "bridging" role, exacerbating the secondary discharge during the machining process, seriously affecting the discharge effect and the machining surface quality.

[0003] In the prior art, the waste residue in the coolant is filtered using a filter screen or a filter element. However, the long-term accumulation of the waste residue will cause blockage of the filter screen or the filter element, reducing the ejection amount after the coolant circulates, seriously affecting the cooling of the wire electrical discharge machining part, and in severe cases, causing the cutting wire to break due to continuous high temperature.

[0004] The filtering method using a filter screen has a simple structure but poor filtering effect. The filtering method using a filter element can basically meet the filtering effect of the coolant fine machining. However, the installation structure of the filter element is mostly relatively complex, the disassembly of the filter element requires professional operation, which takes a long time, and the machine needs to be stopped when replacing the filter element.

[0005] For example, the invention patent with the publication number CN114146465B discloses a filtering device applied to a wire cutting machine, which includes a filtering box. A filtering plate member is installed inside the filtering box. The filtering plate member includes a filtering plate body. One end of the filtering plate body is fixedly connected to a connecting plate body arranged downward. One end of the connecting plate body away from the filtering plate body is hinged with a receiving plate. A cleaning port is opened on one side wall of the filtering box close to the receiving plate body. A limiting component for opening or sealing the cleaning port is connected at the cleaning port. The limiting component rotates the receiving plate body away from the limiting component to open the cleaning port. A scraping plate is closely attached to the upper surface of the filtering plate body. A driving component for driving the scraping plate to move towards or away from the receiving plate body is connected to the scraping plate. This application has a good effect of filtering the coolant. In this technical solution, impurities on the filtering plate member are cleaned by the scraping plate, enabling the filtering plate member to filter the coolant better. However, it is only suitable for cleaning relatively large impurities. Fine particles will be generated in precision machining, and these fine particles will embed in the filtering plate member. When a large amount of fine particles accumulate in the filtering plate member, it will still cause blockage. Moreover, in this technical solution, due to the scraping plate being provided on the filtering plate body, the scraping plate needs to be disassembled and assembled when replacing the filtering plate body, further increasing the replacement time, and the machine must also be stopped during replacement. Summary of the Invention

[0006] The purpose of the present invention is to overcome the deficiencies in the prior art, solve or at least alleviate the problem that the replacement of the filter element of the existing filtering device takes a long time and the machine needs to be stopped when replacing the filter element, and provide a waste residue filtering device for medium-speed wire cutting.

[0007] To achieve the above purpose, the present invention provides the following technical solution: A waste residue filtering device for medium-speed wire cutting, the waste residue filtering device is connected to the coolant system of the medium-speed wire cutting equipment, including a sedimentation tank connected to the discharge end of the coolant system, and further includes a filtering box, a filter paper, and a filter paper replacement component. The top of the filtering box is connected to the bottom of the sedimentation tank. The middle of the filter paper is horizontally arranged in the middle of the filtering box. The filter paper replacement component is used to replace the filter paper in the filtering box. The filter paper replacement component includes a paper feeding roller and a paper receiving roller. The front and rear ends of the filter paper are respectively wound around the paper feeding roller and the paper receiving roller;

[0008] It further includes a liquid storage tank and a supply pump. The liquid storage tank is located above the filtering box. The lower part of the liquid storage tank is connected to the upper part of the purified liquid chamber. The supply pump is used to transport the coolant at the lower part of the filtering box to the coolant system and the liquid storage tank and make the coolant in the sedimentation tank be transported to the upper part of the filtering box.

[0009] To further implement the present invention, the following technical solutions can be preferably selected:

[0010] Preferably, a support plate is laterally arranged in the middle of the filter box, the support plate divides the space inside the filter box into an upper dirty liquid chamber and a lower clean liquid chamber, the support plate is evenly distributed with multiple hollow areas, and the filter paper is laid on the upper side of the support plate.

[0011] Preferably, a control component is further included, which is used to control the supply of coolant and the replacement of filter paper, and the control component includes:

[0012] A first liquid level sensor and a second liquid level sensor, which are used to monitor the liquid level heights in the clean liquid chamber and the liquid storage tank respectively;

[0013] An opening and closing mechanism, which is used to control the opening and closing of the connection between the liquid storage tank and the clean liquid cavity;

[0014] A motor, which is transmission-connected to the paper delivery roller;

[0015] The controller is connected to the first liquid level sensor and the second liquid level sensor and controls the supply pump, the opening and closing mechanism, the motor and the medium-speed wire cutting device.

[0016] Preferably, a baffle is provided at the connection between the liquid storage tank and the supply pump, and the baffle is used to control the opening and closing state of the connection between the liquid storage tank and the supply pump. The baffle is located in the liquid storage tank, and the upper end of the baffle is hinged to the liquid storage tank through a torsion spring, and the lower end of the baffle is attached to the inner wall of the liquid storage tank;

[0017] The opening and closing mechanism includes an opening and closing plug, which is sealingly and slidably arranged at the connection point between the liquid storage tank and the clean liquid cavity. When the difference between the pressure in the liquid storage tank and the pressure in the clean liquid cavity is greater than the set pressure, the opening and closing plug extends outward, and the liquid storage tank is connected to the clean liquid cavity.

[0018] Preferably, the control process of the controller is:

[0019] The first liquid level sensor and the second liquid level sensor monitor the liquid height in the clean liquid cavity and the liquid storage tank respectively and send the liquid level data to the controller. The controller is preset with a first set liquid level, a second set liquid level and a total set liquid level. The controller determines the working state according to the liquid level data. When the liquid level data of the clean liquid cavity is greater than the second set value, it is in the liquid extraction state. When the difference between the pressure in the liquid storage tank and the pressure in the clean liquid cavity is greater than the set pressure, it is in the liquid adding state. When the sum of the liquid level data of the clean liquid cavity and the liquid level data of the liquid storage tank is less than the total set liquid level, it is in the paper changing state. When the liquid level data is less than the first set value, it is in the emergency stop state.

[0020] Preferably, the filter box is in the shape of a closed shell, and an inlet and an outlet are respectively arranged at the front and rear ends of the top of the filter box, the filter paper on the paper placing roller passes through the inlet and enters the filter box, and the filter paper laid on the support plate passes through the outlet and is wound around the paper receiving roller;

[0021] The inlet and the outlet are respectively provided with a front sealing plate and a rear sealing plate.

[0022] Preferably, a partition is vertically arranged in the middle of the precipitation tank. The lower end of the partition is connected to the bottom surface of the precipitation tank, and there is a gap between the upper end and the top surface of the precipitation tank. The partition divides the precipitation tank into a precipitation chamber in the front and a purification chamber in the rear. The upper part of the precipitation chamber is communicated with the discharge end of the coolant system, and the purification chamber is communicated with the waste liquid chamber;

[0023] A filter screen is arranged at the connection between the precipitation chamber and the coolant system.

[0024] Preferably, an iron removal assembly is arranged in the purification chamber. The iron removal assembly includes:

[0025] An iron removal cage, which is a hollow cylinder made of a permanent magnet material. The iron removal cage is rotatably arranged in the purification chamber, and one end of it is communicated with the waste liquid chamber. Micro holes are evenly distributed on the circumferential side wall of the iron removal cage;

[0026] An iron collection hopper, which is fixedly arranged in the purification chamber and is located on one side of the iron removal cage. The upper part of the iron collection hopper is open, and the opening is attached to the circumferential outer wall of the iron removal cage.

[0027] Preferably, a paddle is arranged at one end of the iron removal cage communicated with the waste liquid chamber. When the coolant passes through the paddle and enters the waste liquid chamber, it drives the iron removal cage to rotate.

[0028] Preferably, a spill prevention plate is fixedly arranged in the iron collection hopper. The spill prevention plate is arranged along the radial direction of the iron removal cage. One end of the spill prevention plate faces the iron removal cage and there is a gap between it and the inner wall of the iron collection hopper, and the other end is hermetically connected to the inner wall of the other side of the iron collection hopper.

[0029] The beneficial effects of the present invention are:

[0030] 1. Through multi-stage filtration, the present invention can effectively remove impurities in the coolant, extend the service life of the coolant, and reduce the waste liquid discharge amount at the same time, having good environmental protection benefits.

[0031] 2. When the filter paper in the filter box is blocked, the present invention automatically replaces the filter paper through the filter paper replacement assembly, which can complete the maintenance work without professional personnel, greatly reducing the labor and material costs, and there is no need to stop the machine during the replacement, avoiding reducing the production efficiency due to stopping the machine to replace the filter element. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic structural diagram of the present invention.

[0033] Figure 2 is a diagram of the use state of the present invention.

[0034] Figure 3 is a structural sectional view of the present invention.

[0035] Figure 4 is of the present invention Figure 3Cross-sectional view at A-A in the [specific object].

[0036] Figure 5 For the present invention Figure 3 Cross-sectional view at B-B in the [specific object].

[0037] Figure 6 For the present invention Figure 3 Enlarged view at C in the [specific object].

[0038] Figure 7 Schematic structural diagram of the support plate of the present invention

[0039] Figure 8 Schematic structural diagram of the iron removal cage of the present invention

[0040] Reference numerals are as follows:

[0041] 1 - precipitation tank; 2 - filtration tank; 3 - support plate; 4 - filter paper; 5 - supply pump; 6 - paper feeding roller; 7 - paper receiving roller; 8 - liquid storage tank; 9 - baffle; 10 - front sealing plate; 11 - rear sealing plate; 12 - partition board; 13 - filter screen; 14 - iron removal cage; 15 - iron collection hopper; 16 - paddle; 17 - overflow prevention plate; 18 - middle wire cutting equipment; 19 - opening and closing plug; 101 - precipitation chamber; 102 - purification chamber; 201 - waste liquid chamber; 202 - purified liquid chamber Detailed implementation manners

[0042] In the description of the present invention, it should also be noted that, unless otherwise clearly defined and limited, the terms "set", "install", "connect", and "couple" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations

[0043] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present invention

[0044] Embodiment 1

[0045] Using a filter screen to filter the coolant has a simple structure, but the filtering effect is poor. Using a filter element to filter the coolant can basically meet the filtering effect of the fine processing of the coolant, but most of the installation structures of the filter elements are relatively complex. The disassembly of the filter element requires professional operation, which takes a long time, and the machine needs to be stopped when replacing the filter element

[0046] Refer to Figures 1 to 5 , this embodiment discloses a waste residue filtering device for medium-wire electrical discharge machining, including a sedimentation tank 1, a filtering tank 2, a support plate 3, a filter paper 4, a supply pump 5 and a filter paper replacement assembly. Among them, the filter paper replacement assembly includes a paper feeding roller 6 and a paper receiving roller 7.

[0047] One end of the sedimentation tank 1 is connected to the discharge end of the coolant system, the top of the filtering tank 2 is connected to the sedimentation tank 1, the support plate 3 is horizontally arranged in the middle of the filtering tank 2, and the support plate 3 divides the space in the filtering tank 2 into an upper dirty liquid chamber 201 and a lower clean liquid chamber 202. The support plate 3 is evenly distributed with a plurality of hollow areas, the filter paper 4 is laid on the upper side of the support plate 3 and covers all the hollow areas, the inlet end of the supply pump 5 is connected to the lower part of the clean liquid chamber 202, and the outlet end of the supply pump 5 is connected to the inlet end of the coolant system.

[0048] When the coolant flows out of the coolant system, it first flows through the sedimentation tank 1, then enters the filtering tank 2, then flows into the clean liquid chamber 202, and finally is pumped out by the supply pump 5 and returns to the coolant system again. In this process, the sedimentation tank 1 can deposit large-particle solid impurities to prevent them from entering the filtering tank 2 and blocking the filter paper 4, avoiding larger impurities from scratching the filter paper 4 and improving the service life of the filter paper 4, while the filtering tank 2 can further remove fine solid impurities and other pollutants.

[0049] The filter paper replacement assembly is used to automatically replace the filter paper 4 on the support plate 3. The paper feeding roller 6 is rotatably arranged above one end of the filtering tank 2, one end of the filter paper 4 is wound around the paper feeding roller 6, the paper receiving roller 7 is rotatably arranged outside the end of the filtering tank 2 away from the paper feeding roller 6, and the end of the filter paper 4 away from the paper feeding roller 6 is wound around the paper receiving roller 7.

[0050] When the filter paper 4 is used for a period of time, it will become extremely dirty, and at this time it needs to be replaced. The filter paper replacement assembly of this application is fully automated, and it can automatically complete the replacement process of the filter paper 4 without manual intervention, greatly improving the work efficiency and accuracy.

[0051] The filtering tank 2 is in the shape of a closed shell. The front and rear ends of the top surface of the filtering tank 2 are respectively provided with an inlet and an outlet. The filter paper 4 on the paper feeding roller 6 passes through the inlet and enters the filtering tank 2, and the filter paper 4 laid on the support plate 3 passes through the outlet and is wound around the paper receiving roller 7. The front sealing plate 10 and the rear sealing plate 11 are respectively arranged at the inlet and the outlet.

[0052] This embodiment also optimizes the design of the filter paper replacement assembly, making the whole replacement process smoother and more stable. Specifically, both the paper feeding roller 6 and the paper receiving roller 7 adopt high-precision bearings, which enables them not to vibrate or make noise when rotating at high speed, thus ensuring the flatness and stability of the filter paper 4.

[0053] Refer toFigure 3 and Figure 7 In addition, a pressure roller is added to the support plate 3. The two groups of pressure rollers are respectively located on both sides above the support plate 3. The pressure rollers tightly press both sides of the filter paper 4 against the support plate 3. At the same time, both sides of the support plate 3 are inclined upward, which can not only ensure the position state of the filter paper 4 on the support plate 3, but also prevent the coolant from directly passing through the gap at the edge of the filter paper 4 and losing the filtering effect through the support plate 3.

[0054] In this embodiment, the filter paper 4 is made of polyester fiber material, which has good hydrophilicity and air permeability, and is also relatively wear-resistant and durable. Of course, other types of filter paper 4 can also be flexibly selected according to actual application situations.

[0055] The present invention can effectively remove impurities in the coolant through multi-stage filtration, extend the service life of the coolant, and reduce the waste liquid discharge volume at the same time, having good environmental protection benefits.

[0056] When the filter paper 4 in the filter box 2 is blocked, the filter paper replacement component automatically replaces the filter paper, and the maintenance work can be completed without professional personnel, greatly reducing the labor and material costs. Moreover, there is no need to stop the machine during replacement, avoiding the reduction of production efficiency due to stopping to replace the filter element.

[0057] Embodiment Two

[0058] In the technical solution of Embodiment One, although the automatic replacement of the filter paper 4 is achieved, it still requires the staff to check the degree of blockage of the filter paper 4 to determine whether the filter paper 4 needs to be replaced, and the human judgment has instability. When the filter paper 4 is replaced when it still has a good filtering effect, it will cause waste of the filter paper 4 and increase the production cost. And when the coolant in the clean liquid cavity 202 is less, the supply pump 5 cannot pump enough coolant into the coolant system, which will cause the lack of coolant during the operation of the middle wire cutting equipment 18.

[0059] At the same time, when the coolant in the clean liquid cavity 202 is less, a large negative pressure is formed therein. When the negative pressure is too large, the phenomenon of tearing the filter paper 4 is likely to occur.

[0060] Refer to Figures 1 to 5 In this embodiment, it further includes a liquid storage tank 8, which is located above the filter box 2. The lower part of the liquid storage tank 8 is communicated with the upper part of the clean liquid cavity 202, and the liquid outlet end of the supply pump 5 is communicated with the upper part of the liquid storage tank 8.

[0061] It further includes a control component, which is used to control the supply of the coolant and the replacement of the filter paper 4. The control component includes:

[0062] A first liquid level sensor and a second liquid level sensor, which are respectively used to monitor the liquid level heights in the clean liquid cavity 202 and the liquid storage tank 8;

[0063] An opening and closing mechanism for controlling the opening and closing at the connection between the liquid storage tank 8 and the purified liquid chamber 202;

[0064] A motor drivingly connected to the paper receiving roller 7;

[0065] A controller connected to the first liquid level sensor and the second liquid level sensor and controlling the supply pump 5, the opening and closing mechanism, the motor and the middle wire electrical discharge machining equipment 18.

[0066] A baffle 9 is provided at the connection between the liquid storage tank 8 and the supply pump 5 for controlling the opening and closing state at the connection between the liquid storage tank 8 and the supply pump 5. The baffle 9 is located inside the liquid storage tank 8. The upper end of the baffle 9 is hinged to the liquid storage tank 8 by a torsion spring, and the lower end of the baffle 9 fits against the inner wall of the liquid storage tank 8;

[0067] The opening and closing mechanism includes a closing plug 19 which is hermetically and slidably arranged at the connection between the liquid storage tank 8 and the purified liquid chamber 202. When the pressure difference between the pressure in the liquid storage tank 8 and the pressure in the purified liquid chamber 202 is greater than the set pressure, the closing plug 19 extends outwards, and the liquid storage tank 8 is communicated with the purified liquid chamber 202.

[0068] The control process of the controller is as follows:

[0069] The first liquid level sensor and the second liquid level sensor respectively monitor the liquid levels in the purified liquid chamber 202 and the liquid storage tank 8 and send the liquid level data to the controller. The controller presets a first set liquid level, a second set liquid level and a total set liquid level. The controller determines the working state according to the liquid level data. When the liquid level data in the purified liquid chamber 202 is greater than the second set value, it is in the liquid pumping state. When the pressure difference between the pressure in the liquid storage tank 8 and the pressure in the purified liquid chamber 202 is greater than the set pressure, it is in the liquid adding state. When the sum of the liquid level data in the purified liquid chamber 202 and the liquid level data in the liquid storage tank 8 is less than the total set liquid level, it is in the paper changing state. When the liquid level data is less than the first set value, it is in the emergency stop state;

[0070] When in the working state and when the middle wire electrical discharge machining equipment 18 is working, the controller controls the supply pump 5 to pump the coolant in the purified liquid chamber 202 to the coolant system. A part of the coolant pumped out by the supply pump 5 enters the liquid storage tank 8, and the pressure in the liquid storage tank 8 gradually increases. Due to the blockage of the filter paper 4, the liquid inflow volume in the purified liquid chamber 202 is less than the liquid outflow volume, and the pressure in the purified liquid chamber 202 gradually decreases;

[0071] As the liquid level height in the purified liquid chamber 202 gradually decreases, the pressure difference between the pressure in the liquid storage tank 8 and the pressure in the purified liquid chamber 202 is greater than the set pressure, and it enters the liquid adding state. The closing plug 19 extends outwards, the liquid storage tank 8 is communicated with the purified liquid chamber 202, and the coolant in the liquid storage tank 8 enters the purified liquid chamber 202, and the pressure in the liquid storage tank 8 is maintained within the set range;

[0072] When in the paper changing state, the controller controls the motor to drive the paper receiving roller 7 to rotate, so that all the filter paper 4 currently laid on the support plate 3 is moved out of the filter box 2, and the filter paper 4 of the paper feeding roller 6 is laid on the support plate 3. In this state, the controller controls the supply pump 5 to work synchronously with the middle wire cutting equipment 18;

[0073] When in the emergency stop state, the controller controls the supply pump 5 and the middle wire cutting equipment 18 to stop working.

[0074] By setting a liquid level sensor to monitor the liquid level heights in the clean liquid cavity 202 and the liquid storage tank 8 in real time, the specific working state can be judged, so as to automatically determine whether the filter paper 4 needs to be replaced, avoid wasting the filter paper 4, and ensure the safety of the work.

[0075] At the same time, it also automatically controls the pressure in the coolant system, the clean liquid cavity 202 and the liquid storage tank 8. When the pressure in the coolant system is small, all the coolant pumped out by the supply pump 5 is transported to the coolant system. When the transported coolant is large, the pressure in the coolant system increases, thereby pushing the baffle 9, so that a part of the coolant enters the liquid storage tank 8, avoiding the phenomenon that the coolant transported to the coolant system is insufficient, and making the coolant system work under a stable pressure.

[0076] The pressure in the liquid storage tank 8 increases as the coolant in it increases. The increase in its pressure also increases the force required to push the baffle 9, avoiding too much coolant entering the liquid storage tank 8, keeping the pressure in the liquid storage tank 8 within a certain limit, and avoiding frequent liquid supply to the clean liquid cavity 202, resulting in a small negative pressure in the clean liquid cavity 202 and affecting the filtration efficiency. The coolant system is provided with a pressure relief mechanism to avoid potential safety hazards caused by high pressures in both the coolant system and the liquid storage tank 8 in extreme cases.

[0077] The pressure in the clean liquid cavity 202 decreases as the coolant in it decreases. The clean liquid cavity 202 is in a negative pressure state. When the negative pressure in it is large, it is easy to cause the filter paper 4 to tear. When the negative pressure in it is small, the filtration efficiency will be reduced. Therefore, in this embodiment, after the negative pressure in the clean liquid cavity 202 drops to a certain extent, the pressure difference between the clean liquid cavity 202 and the liquid storage tank 8 will push the on-off plug 19 to move, so that the coolant in the liquid storage tank 8 is injected into the clean liquid cavity 202, avoiding the filter paper 4 from being torn due to too low negative pressure in the clean liquid cavity 202. At the same time, when communicating, the liquid storage tank 8 needs to be under positive pressure to ensure that there is a certain amount of coolant in the liquid storage tank 8 during communication.

[0078] Embodiment III

[0079] In the above embodiment, if the fine particles are only removed by the filter paper 4, the frequency of replacing the filter paper 4 will increase. In order to remove some fine particles in advance before passing through the filter paper 4 and improve the service life of the filter paper 4.

[0080] Refer to Figures 1 to 8, in order to avoid or reduce impurities in the sedimentation tank 1 from entering the filtration tank 2, a partition 12 is vertically arranged in the middle of the sedimentation tank 1. The lower end of the partition 12 is connected to the bottom surface of the sedimentation tank 1, and there is a gap between the upper end and the top surface of the sedimentation tank 1. The partition 12 divides the sedimentation tank 1 into a sedimentation chamber 101 at the front and a purification chamber 102 at the rear. The upper part of the sedimentation chamber 101 communicates with the discharge end of the coolant system, the purification chamber 102 communicates with the waste liquid chamber 201, and a filter screen 13 is arranged at the connection between the sedimentation chamber 101 and the coolant system.

[0081] Referring to Figure 6 , in order to remove metal micropowders suspended in the coolant, a iron removal assembly is arranged in the purification chamber 102. The iron removal assembly includes an iron removal cage 14 and an iron collection hopper 15. The iron removal cage 14 is a hollow cylinder made of a permanent magnetic material. The iron removal cage 14 is rotatably arranged in the purification chamber 102 and one end thereof communicates with the waste liquid chamber 201. Micropores are evenly distributed on the circumferential side wall of the iron removal cage 14. The iron collection hopper 15 is fixedly arranged in the purification chamber 102 and is located on one side of the iron removal cage 14. The upper part of the iron collection hopper 15 is open and the opening is attached to the circumferential outer wall of the iron removal cage 14.

[0082] A paddle 16 is arranged at one end of the iron removal cage 14 communicating with the waste liquid chamber 201. When the supply pump 5 pumps the coolant in the purification chamber 102 into the waste liquid chamber 201, the coolant passes through the paddle 16 and drives the paddle 16 and the iron removal cage 14 to rotate together.

[0083] In order to prevent the metal micropowders collected in the iron collection hopper 15 from overflowing the iron collection hopper 15 along with the coolant, an anti-overflow plate 17 is fixedly arranged in the iron collection hopper 15. The anti-overflow plate 17 is arranged along the radial direction of the iron removal cage 14. One end of the anti-overflow plate 17 faces the iron removal cage 14 and there is a gap between it and the inner wall of the iron collection hopper 15, and the other end is hermetically connected to the inner wall of the other side of the iron collection hopper 15.

[0084] Before the coolant enters the waste liquid chamber 201, impurity removal is carried out multiple times, thereby improving the service life of the filter paper 4 and reducing the frequency of replacing the filter paper 4.

[0085] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A waste residue filtering device for medium-speed wire electrical discharge machining, the waste residue filtering device being connected to the coolant system of the medium-speed wire electrical discharge machining equipment, comprising a sedimentation tank connected to the discharge end of the coolant system, characterized in that, It also includes a filter box, filter paper and a filter paper replacement assembly, wherein the top of the filter box is connected to the bottom of the sedimentation box, the middle of the filter paper is horizontally arranged in the middle of the filter box, and the filter paper replacement assembly is used to replace the filter paper in the filter box, and the filter paper replacement assembly includes a paper placing roller and a paper collecting roller, and the front and rear ends of the filter paper are respectively wound around the paper placing roller and the paper collecting roller; It also includes a liquid storage tank and a supply pump, wherein the liquid storage tank is located above the filter box, and the lower part of the liquid storage tank is connected to the upper part of the clean liquid cavity. The supply pump is used to transport the coolant at the lower part of the filter box to the coolant system and the liquid storage tank, and to transport the coolant in the sedimentation tank to the upper part of the filter box.

2. The waste residue filtering device for medium-speed wire cutting according to claim 1, wherein A support plate is disposed transversely in the middle of the filter box, and the support plate divides the space inside the filter box into an upper dirty liquid chamber and a lower clean liquid chamber. The support plate is evenly distributed with a plurality of hollow areas, and the filter paper is laid on the upper side of the support plate.

3. The waste residue filtering device for medium-speed wire cutting according to claim 2, wherein The device also includes a control assembly for controlling the supply of coolant and the replacement of filter paper, wherein the control assembly includes: A first liquid level sensor and a second liquid level sensor, which are used to monitor the liquid level heights in the clean liquid chamber and the liquid storage tank respectively; An opening and closing mechanism, which is used to control the opening and closing of the connection between the liquid storage tank and the clean liquid cavity; A motor, which is transmission-connected to the paper delivery roller; The controller is connected to the first liquid level sensor and the second liquid level sensor and controls the supply pump, the opening and closing mechanism, the motor and the medium-wire cutting device.

4. A waste residue filtering device for medium-speed wire cutting according to claim 3, characterized in that, A baffle is provided at the connection between the liquid storage tank and the supply pump, and the baffle is used to control the opening and closing state of the connection between the liquid storage tank and the supply pump. The baffle is located in the liquid storage tank, the upper end of the baffle is hinged to the liquid storage tank through a torsion spring, and the lower end of the baffle is attached to the inner wall of the liquid storage tank; The opening and closing mechanism includes an opening and closing plug, which is sealingly and slidably arranged at the connection point between the liquid storage tank and the clean liquid cavity. When the difference between the pressure in the liquid storage tank and the pressure in the clean liquid cavity is greater than the set pressure, the opening and closing plug extends outward, and the liquid storage tank is connected to the clean liquid cavity.

5. The waste residue filtering device for medium-speed wire cutting according to claim 4, characterized in that, The control flow of the controller is: The first liquid level sensor and the second liquid level sensor monitor the liquid height in the clean liquid cavity and the liquid storage tank respectively and send the liquid level data to the controller. The controller is preset with a first set liquid level, a second set liquid level and a total set liquid level. The controller determines the working state according to the liquid level data. When the liquid level data of the clean liquid cavity is greater than the second set value, it is in the liquid extraction state. When the difference between the pressure in the liquid storage tank and the pressure in the clean liquid cavity is greater than the set pressure, it is in the liquid adding state. When the sum of the liquid level data of the clean liquid cavity and the liquid level data of the liquid storage tank is less than the total set liquid level, it is in the paper changing state. When the liquid level data is less than the first set value, it is in the emergency stop state.

6. The waste residue filtering device for medium-wire electrical discharge machining according to claim 1, wherein The filter box is in the shape of a closed shell, and an inlet and an outlet are respectively arranged at the front and rear ends of the top of the filter box. The filter paper on the paper placing roller passes through the inlet and enters the filter box, and the filter paper laid on the support plate passes through the outlet and is wound around the paper receiving roller. The inlet and the outlet are respectively provided with a front sealing plate and a rear sealing plate.

7. The waste residue filtering device for medium-speed wire cutting according to claim 1, characterized in that, A partition is vertically arranged in the middle of the sedimentation box, the lower end of the partition is connected to the bottom surface of the sedimentation box, and a gap is left between the upper end and the top surface of the sedimentation box. The partition divides the sedimentation box into a sedimentation chamber at the front and a purification chamber at the rear. The upper part of the sedimentation chamber is connected to the discharge end of the coolant system, and the purification chamber is connected to the dirty liquid chamber; A filter screen is arranged at the connection point between the precipitation chamber and the cooling liquid system.

8. A waste residue filtering device for medium-speed wire cutting according to claim 7, characterized in that, An iron removal component is arranged in the purification cavity, and the iron removal component includes: An iron removal cage, which is a hollow cylinder made of a permanent magnet material. The iron removal cage is rotatably arranged in the purification cavity, and one end of it is communicated with the sewage cavity. Micropores are evenly distributed on the circumferential side wall of the iron removal cage; An iron collection hopper, which is fixedly arranged in the purification cavity and is located on one side of the iron removal cage. The upper part of the iron collection hopper is open, and the opening is attached to the circumferential outer wall of the iron removal cage.

9. The waste residue filtering device for medium-speed wire cutting according to claim 8, characterized in that, A paddle is arranged at one end of the iron removal cage communicated with the sewage cavity. When the coolant passes through the paddle and enters the sewage cavity, the iron removal cage is driven to rotate.

10. A waste residue filtering device for medium-speed wire cutting according to claim 8, characterized in that, An anti-overflow plate is fixedly arranged in the iron collection hopper. The anti-overflow plate is arranged along the radial direction of the iron removal cage. One end of the anti-overflow plate faces the iron removal cage and there is a gap between it and the inner wall of the iron collection hopper, and the other end is hermetically connected to the inner wall on the other side of the iron collection hopper.

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