Screen washing equipment and using method thereof

Abstract

The invention discloses screen printing plate washing equipment and a using method thereof.The screen printing plate washing equipment comprises a water tank, a screen printing plate positioning component and a washing component, the screen printing plate positioning component comprises a fixing base, a supporting frame and a positioning frame used for containing a screen printing plate, the positioning frame is rotationally arranged in the supporting frame, and a motor used for driving the positioning frame to turn over is arranged on the supporting frame; a guide rod is arranged on one side of the supporting frame, a sliding hole corresponding to the guide rod is formed in the fixing base, and the guide rod is in sliding fit with the sliding hole. A rack is arranged on one side of the supporting frame, and a resistance adjusting component which is matched with the rack and used for adjusting the moving resistance of the supporting frame is arranged on the fixing base. And the flushing part is arranged corresponding to the positioning frame and is used for flushing the screen placed in the positioning frame. According to the washing device, by controlling the water flow impact force borne by the screen printing plate in the washing process, the situation that a silk screen deforms and is damaged due to the fact that the water flow impact force is too large can be effectively avoided.

Description

Technical Field

[0001] The invention relates to a washing device, and in particular to a screen washing device and a use method thereof. Background Art

[0002] Screen printing is a printing technique that uses a silk screen as a medium to transfer ink to the printed object. This printing method can be applied to a variety of materials, including paper, plastic, metal, glass, wood, fabric, etc., and can be used for printing on flat or irregular surfaces.

[0003] The screen is an important component in the screen printing process. When making the screen, choose an appropriate screen (usually made of nylon, polyester or other synthetic fibers), apply photosensitive emulsion on the screen, and then place the design pattern on the screen. Part of the photosensitive emulsion on the screen is covered by the pattern, and then the photosensitive emulsion is cured by exposure. The photosensitive emulsion in the area of ​​the screen not covered by the pattern will be cured by light, while the photosensitive emulsion in the area of ​​the screen covered by the pattern is not exposed to light and thus not cured; then the screen is washed, and during the washing, the part not exposed to light will be washed away, thereby forming an open area on the screen consistent with the pattern, thus obtaining a screen.

[0004] When flushing the screen, the screen is usually placed in front of the nozzle and flushed through the nozzle. In the actual process, it is often difficult to control the impact force of the water flow on the screen, which may cause the problem of excessive impact force of the water flow. If the impact force of the water flow is too large, the screen may be deformed and damaged, especially for finer screens, which may cause serious damage. In addition, excessive water flow impact may cause the solidified photosensitive emulsion layer to peel off from the screen, causing the entire screen to fail and require re-plate making, which increases time and material costs. Summary of the invention

[0005] The purpose of the present invention is to solve the deficiencies in the prior art and provide a screen washing device and a method for using the same.

[0006] The objective of the present invention is achieved through the following technical scheme: a screen washing device comprises a water tank, a screen positioning component and a washing component, the screen positioning component comprises a fixed seat, a support frame and a positioning frame for placing the screen, the positioning frame is rotatably arranged in the support frame, and a motor for driving the positioning frame to flip is provided on the support frame; a guide rod is provided on one side of the support frame, and a sliding hole corresponding to the guide rod is provided on the fixed seat, and the guide rod and the sliding hole are slidably matched; a rack is provided on one side of the support frame, and a resistance adjustment component is provided on the fixed seat, which cooperates with the rack and is used to adjust the moving resistance of the support frame; the washing component is arranged corresponding to the positioning frame, and the washing component is used to wash the screen placed in the positioning frame.

[0007] Preferably, the flushing component comprises a nozzle and a swing device, the nozzle is connected to the swing device, and the swing device drives the nozzle to swing up and down.

[0008] Preferably, the resistance adjustment component includes a gear and a shell. A cavity is provided in the shell. A cam is rotatably arranged in the cavity. A cam surface is provided in the circumferential direction of the cam. The cam surface includes a plurality of peaks, and a trough is provided between adjacent peaks. A guide hole is provided on one side of the cavity. A push rod is slidably provided in the guide hole, and one end of the push rod contacts the cam surface on the cam. An adjusting screw is threadedly connected to one end of the guide hole, and a pressure spring is provided between the adjusting screw and the push rod. The gear is located outside the shell, and the gear and the cam are connected by a connecting shaft; the gear is meshed with the rack.

[0009] Preferably, a positioning groove is provided on the inner side of the positioning frame, and the screen is placed in the positioning groove; a rotating shaft is provided at the lower end of the positioning frame, and an axial hole is provided at the lower end of the supporting frame, and the rotating shaft is connected to the axial hole; the upper end of the positioning frame is connected to the output shaft of the motor.

[0010] Preferably, a plunger hole is provided at the upper end of the positioning frame, a plunger is provided in the plunger hole, a first liquid medium cavity is formed between the plunger and the lower end of the plunger hole, and a first return spring is provided between the plunger and the lower end of the plunger hole; cylinder bodies are provided on both sides of the positioning frame, a piston is provided in the cylinder body, an end plate is provided on the end of the cylinder body close to the positioning frame, and a second return spring is provided between the end plate and the piston; a second liquid medium cavity is formed between the piston and the end of the cylinder body away from the end plate; a piston rod is connected to the piston, the piston rod passes through the end plate, and a movable limit block is provided at the front end of the piston rod; an avoidance cavity for accommodating the movable limit block is provided on the inner side of the positioning frame; the positioning The frame is provided with a liquid medium channel, one end of the liquid medium channel is connected to the first liquid medium cavity, the other end of the liquid medium channel is connected to a liquid guide tube, and the end of the liquid guide tube away from the liquid medium channel is connected to the second liquid medium cavity; the first liquid medium cavity and the second liquid medium cavity are both filled with liquid medium; a transmission ring corresponding to the plunger is provided on the support frame, the transmission ring is fixedly connected to the support frame, the lower end of the transmission ring is provided with a contour surface, the contour surface includes a plane area and a recessed area, and the upper end of the plunger contacts the contour surface; when the positioning frame is in the initial state, the positioning groove on the positioning frame faces the flushing component, and the upper end of the plunger contacts the recessed area on the contour surface.

[0011] Preferably, a roller is provided at the upper end of the plunger.

[0012] Preferably, the liquid medium is hydraulic oil.

[0013] A method for using a screen washing device, the specific method is as follows: Step 1: Place the screen to be washed into the positioning groove on the positioning frame, and make one side of the screen face the washing component; wash one side of the screen through the washing component; when the water flow impact force of the washing component on the screen is greater than the movement resistance of the support frame, the screen and the support frame move in the direction away from the washing component under the impact of the water flow. During the movement of the screen, as the distance between the screen and the washing component increases, the water flow impact force on the screen gradually decreases until the water flow impact force is balanced with the movement resistance of the support frame, so that the screen reaches a balanced position; Step 2: When the flushing component has finished flushing one side of the screen, the flushing component is closed; the motor drives the positioning frame to rotate 180 degrees to turn the screen over; during the screen flipping process, the upper end of the plunger moves from the recessed area on the contour surface to the flat area on the contour surface, so that the plunger moves downward, so that the liquid medium in the first liquid medium cavity enters the second liquid medium cavity through the liquid medium channel and the liquid guide tube, and pushes the piston to move, so that the movable limit block extends from the avoidance cavity and presses against both sides of the screen; after the screen is flipped over, the flushing component is opened and the other side of the screen is flushed; after the flushing is completed, the flushing component is closed; Step 3: The motor drives the positioning frame to rotate 180 degrees to turn the screen over; during the turning process of the screen, the upper end of the plunger moves from the flat area on the contour surface to the recessed area on the contour surface. At this time, the plunger moves upward under the action of the first return spring, so that the liquid medium in the second liquid medium cavity flows back to the first liquid medium cavity through the liquid medium channel and the liquid guide tube, and the movable limit block releases the screen and retracts it into the avoidance cavity; the screen after flushing is removed from the positioning frame.

[0014] The beneficial effect of the present invention is that in the present invention, by controlling the magnitude of the water flow impact force on the screen during the flushing process, deformation and damage of the screen caused by excessive water flow impact can be effectively avoided, while also avoiding excessive water flow impact that causes the solidified photosensitive emulsion layer to peel off from the screen and cause the entire screen to fail. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention.

[0016] Figure 2 This is a schematic diagram of the structure of the screen positioning components.

[0017] Figure 3 A schematic diagram of the structure of the positioning frame.

[0018] Figure 4 A side view of the positioning frame.

[0019] Figure 5 for Figure 4 Cross-sectional view along the AA direction.

[0020] Figure 6 for Figure 5 Enlarged view of part D in the middle.

[0021] Figure 7 for Figure 4 Cross-sectional view along the BB direction.

[0022] Figure 8 for Figure 7 Cross-sectional view along the EE direction.

[0023] Fig. 9 It is a schematic diagram of the structure of the transmission ring.

[0024] Fig.10 It is a structural schematic diagram of the resistance adjustment component.

[0025] Fig.11 It is a cross-sectional view of the resistance adjustment component.

[0026] In the figure: 1, water tank, 2, fixing seat, 3, supporting frame, 4, positioning frame, 4a, positioning groove, 4b, avoidance chamber, 4c, liquid medium channel, 4d, plunger hole, 5, guide rod, 6, resistance adjustment component, 6a, gear, 6b, housing, 6c, adjusting screw, 6d, connecting shaft, 6e, cam, 6f, guide hole, 6g, push rod, 6h, top pressure spring, 7, rack, 8, motor, 9, nozzle, 10, swing device, 12, transmission ring, 12a, plane area, 12b, recessed area, 13, rotating shaft, 14, plunger, 15, cylinder body, 15a, second liquid medium chamber, 16, liquid guide tube, 18, roller, 19, first return spring, 20, movable limit block, 21, piston, 22, piston rod, 23, end plate, 24, second return spring. DETAILED DESCRIPTION

[0027] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0028] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0029] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0030] like Figures 1 to 11 As shown, a screen washing device includes a water tank 1, a screen positioning component, and a washing component. The screen positioning component includes a fixed seat 2, a support frame 3, and a positioning frame 4 for placing the screen. The positioning frame 4 is rotatably set in the support frame 3, and the support frame 3 is provided with a motor 8 for driving the positioning frame 4 to flip; a guide rod 5 is provided on one side of the support frame 3, and a sliding hole corresponding to the guide rod 5 is provided on the fixed seat 2, and the guide rod 5 slidably cooperates with the sliding hole; a rack 7 is provided on one side of the support frame 3, and a resistance adjusting component 6 that cooperates with the rack 7 and is used to adjust the moving resistance of the support frame 3 is provided on the fixed seat 2; the washing component is arranged corresponding to the positioning frame 4, and the washing component is used to wash the screen placed in the positioning frame 4.

[0031] In the present invention, the screen positioning component is arranged in the water tank 1, and the shape of the positioning frame 4 matches the shape of the screen. The rack 7 is parallel to the guide rod 5. Four guide rods 5 are arranged on one side of the support frame 3, and the four guide rods are used to ensure the stable movement of the support frame 3 in the horizontal direction. The flushing component can generate a jet of water to flush the screen surface. When flushing, first move the support frame 3 to a position close to the flushing component, place the screen in the positioning frame 4, then turn on the flushing component, and flush the screen through the flushing component; during the flushing process, if the water flow impact force of the flushing component on the screen is greater than the moving resistance of the support frame 3, the screen and the support frame will move in the direction away from the flushing component under the impact of the water flow. During the movement of the screen, as the distance between the screen and the flushing component increases, the water flow impact force on the screen will gradually decrease until the water flow impact force is balanced with the moving resistance of the support frame 3, so that the screen reaches a balanced position, at which time the screen is stable at this position, and the magnitude of the water flow impact force on the screen is consistent with the moving resistance of the support frame 3; therefore, by adjusting the moving resistance of the support frame 3 through the resistance adjustment component 6, the magnitude of the water flow impact force on the screen during the flushing process can be adjusted. In the present invention, by controlling the magnitude of the water flow impact force on the screen during the washing process, deformation and damage of the screen caused by excessive water flow impact can be effectively avoided. At the same time, it also avoids excessive water flow impact causing the solidified photosensitive emulsion layer to peel off from the screen and cause the entire screen to fail.

[0032] In this embodiment, the positioning frame 4 and the supporting frame 3 are both rectangular frame structures.

[0033] The flushing component includes a nozzle 9 and a swing device 10, wherein the nozzle 9 is connected to the swing device 10, and the swing device 10 drives the nozzle 9 to swing up and down. The nozzle 9 is connected to a water supply device through a water pipe, and a booster pump is provided on the water supply device, which sprays a water flow with a certain pressure outward through the nozzle 9 to flush the screen. In this embodiment, the nozzle adopts a flat nozzle, and the swing device 10 drives the nozzle to swing up and down within a certain angle range to cover the entire screen surface.

[0034] Specifically, the resistance adjustment component 6 includes a gear 6a and a housing 6b. A cavity is provided in the housing 6b. A cam 6e is rotatably provided in the cavity. A cam 6e surface is provided in the circumferential direction of the cam 6e. The cam 6e surface includes a plurality of wave peaks, and a wave trough is provided between adjacent wave peaks. A guide hole 6f is provided on one side of the cavity. A push rod 6g is slidably provided in the guide hole 6f. One end of the push rod 6g contacts the cam 6e surface on the cam 6e. An adjustment screw 6c is threadedly connected to one end of the guide hole 6f. A pressure spring 6h is provided between the adjustment screw 6c and the push rod 6g. The gear 6a is located outside the housing 6b. The gear 6a and the cam 6e are connected by a connecting shaft 6d. The gear 6a is meshed with a rack 7. The guide hole 6f is provided along the radial direction of the cam 6e, and the end of the push rod 6g close to the cam 6e is in an arc shape. When the cam 6e is rotating, the push rod 6g will move along the cam 6e surface on the cam 6e, and the push rod 6g will pass through the peaks and troughs on the cam 6e surface in sequence. The existence of the push rod 6g causes a certain resistance to the rotation of the cam 6e and the gear 6a; and because the gear 6a is engaged with the rack 7, it causes a certain resistance to the movement of the rack 7, and then causes a certain resistance to the movement of the support frame 3; when the adjusting screw 6c is rotated, the compression amount of the push spring 6h can be changed, thereby adjusting the push pressure of the push rod 6g on the cam 6e surface, and then adjusting the rotation resistance of the cam 6e and the gear 6a, and finally adjusting the movement resistance of the support frame 3.

[0035] A positioning groove 4a is provided on the inner side of the positioning frame 4, and the screen is placed in the positioning groove 4a; a rotating shaft 13 is provided at the lower end of the positioning frame 4, and an axial hole is provided at the lower end of the supporting frame 3, and the rotating shaft 13 is connected to the axial hole; the upper end of the positioning frame 4 is connected to the output shaft of the motor 8.

[0036] Furthermore, a plunger hole 4d is provided at the upper end of the positioning frame 4, a plunger 14 is provided in the plunger hole 4d, a first liquid medium cavity is formed between the plunger 14 and the lower end of the plunger hole 4d, and a first return spring 19 is provided between the plunger 14 and the lower end of the plunger hole 4d; cylinder bodies 15 are provided on both sides of the positioning frame 4, a piston 21 is provided in the cylinder body 15, an end plate 23 is provided at one end of the cylinder body 15 close to the positioning frame 4, and a second return spring 24 is provided between the end plate 23 and the piston 21; a second liquid medium cavity 15a is formed between the piston 21 and an end of the cylinder body 15 away from the end plate 23; a piston rod 22 is connected to the piston 21, the piston rod 22 passes through the end plate 23, and a movable limit block 20 is provided at the front end of the piston rod 22; a stowage for accommodating the movable limit block 20 is provided on the inner side of the positioning frame 4 cavity 4b; a liquid medium channel 4c is provided on the positioning frame 4, one end of the liquid medium channel 4c is communicated with the first liquid medium cavity, and the other end of the liquid medium channel 4c is connected to a liquid guide tube 16, and the end of the liquid guide tube 16 away from the liquid medium channel 4c is communicated with the second liquid medium cavity 15a; the first liquid medium cavity and the second liquid medium cavity 15a are both filled with liquid medium; a transmission ring 12 corresponding to the plunger 14 is provided on the support frame 3, the transmission ring 12 is fixedly connected to the support frame 3, and a contour surface is provided at the lower end of the transmission ring 12, the contour surface includes a plane area 12a and a recessed area 12b, and the upper end of the plunger 14 contacts the contour surface; when the positioning frame 4 is in the initial state, the positioning groove 4a on the positioning frame 4 faces the flushing component, and the upper end of the plunger 14 contacts the recessed area 12b on the contour surface.

[0037] When placing the screen, the positioning frame 4 is in the initial state, and the screen is directly placed in the positioning groove 4a on the inner side of the positioning frame 4, and then the flushing component is directly opened to flush the screen; when flushing this side of the screen, the screen is impacted by the water flow, and the screen will be firmly fixed in the positioning frame 4. At this time, even if no fixing measures are taken for the screen, the screen can be stably placed in the positioning frame 4. When the positioning frame 4 is rotated 180 degrees and the other side of the screen is flushed, the upper end of the plunger 14 moves from the recessed area 12b on the contour surface to the flat area 12a on the contour surface during the flipping process of the screen, so that the plunger 14 moves downward, so that the liquid medium in the first liquid medium cavity enters the second liquid medium cavity 15a through the liquid medium channel 4c and the liquid guide tube 16, and pushes the piston 21 to move, so that the movable limit block 20 extends from the avoidance cavity 4b and presses against both sides of the screen, and the movable limit block 20 presses against the screen tightly, so that The screen can withstand the impact of water flow and be stably fixed in the positioning frame 4; when the screen is flipped 180 degrees again, the upper end of the plunger 14 moves from the flat area 12a on the contour surface to the recessed area 12b on the contour surface, and the plunger 14 moves upward under the action of the first return spring 19, so that the liquid medium in the second liquid medium cavity 15a flows back to the first liquid medium cavity through the liquid medium channel 4c and the liquid guide tube 16, and the movable limit block 20 releases the screen and retracts it into the avoidance cavity 4b; at this time, the screen can be removed from the positioning frame 4.

[0038] In the present invention, after the screen is placed in the positioning frame 4, there is no need for manual operation to fix the screen. The screen can be automatically fixed and clamped during the process of turning over and flushing, and can be automatically released from the positioning frame 4 when turned over again, and no manual operation is required in this process; the screen is directly placed in the positioning frame 4 before flushing, and the screen can be directly removed from the positioning frame 4 after flushing is completed, which facilitates the flushing operation of the screen.

[0039] In this embodiment, the cross section of the movable stop block 20 is a right-angle trapezoid, and a top-pressing inclined surface is provided on the movable stop block. When the movable stop block fixes the screen, the top-pressing inclined surface on the movable positioning plate contacts the hard outer frame of the screen, and a partial pressure is generated on the screen toward the bottom of the positioning groove 4a through the top-pressing inclined surface.

[0040] The upper end of the plunger 14 is provided with a roller 18. By providing the roller 18 at the upper end of the plunger 14, the roller 18 can reduce the friction resistance between the upper end of the plunger 14 and the contour surface.

[0041] In this embodiment, hydraulic oil is used as the liquid medium.

[0042] A method for using a screen washing device, the specific method is as follows: Step 1: Place the screen to be washed into the positioning groove 4a on the positioning frame 4, and make one side of the screen face the washing component; wash one side of the screen through the washing component; when the water flow impact force of the washing component on the screen is greater than the movement resistance of the support frame 3, the screen and the support frame move in the direction away from the washing component under the impact of the water flow. During the movement of the screen, as the distance between the screen and the washing component increases, the water flow impact force on the screen gradually decreases until the water flow impact force is balanced with the movement resistance of the support frame 3, so that the screen reaches a balanced position.

[0043] Step 2: When the flushing component has finished flushing one side of the screen, the flushing component is closed; the motor 8 drives the positioning frame 4 to rotate 180 degrees to turn the screen over; during the flipping process of the screen, the upper end of the plunger 14 moves from the recessed area 12b on the contour surface to the flat area 12a on the contour surface, so that the plunger 14 moves downward, so that the liquid medium in the first liquid medium cavity enters the second liquid medium cavity 15a through the liquid medium channel 4c and the liquid guide tube 16, pushing the piston 21 to move, so that the movable limit block 20 extends from the avoidance cavity 4b and presses against both sides of the screen; after the screen is turned over, the flushing component is opened and the other side of the screen is flushed; after the flushing is completed, the flushing component is closed.

[0044] Step 3: The motor 8 drives the positioning frame 4 to rotate 180 degrees to turn the screen over; during the turning process of the screen, the upper end of the plunger 14 moves from the flat area 12a on the contour surface to the recessed area 12b on the contour surface. At this time, the plunger 14 moves upward under the action of the first return spring 19, so that the liquid medium in the second liquid medium cavity 15a flows back to the first liquid medium cavity through the liquid medium channel 4c and the liquid guide tube 16, and the movable limit block 20 releases the screen and retracts it into the avoidance cavity 4b; the screen is removed from the positioning frame 4 after flushing.

[0045] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the protection scope of the present invention.

Claims

1. Screen washing equipment, characterized in that: It includes a water tank, a screen positioning component, and a washing component. The screen positioning component includes a fixing seat, a support frame, and a positioning frame for placing the screen. The positioning frame is rotatably arranged in the support frame, and a motor for driving the positioning frame to flip is arranged on the support frame. A guide rod is provided on one side of the support frame, and a sliding hole corresponding to the guide rod is provided on the fixed seat, and the guide rod and the sliding hole are slidably matched; a rack is provided on one side of the support frame, and a resistance adjustment component is provided on the fixed seat, which cooperates with the rack and is used to adjust the moving resistance of the support frame; a flushing component is arranged corresponding to the positioning frame, and the flushing component is used to flush the screen placed in the positioning frame.

2. The screen washing device according to claim 1, characterized in that: The flushing component comprises a nozzle and a swing device, the nozzle is connected to the swing device, and the swing device drives the nozzle to swing up and down.

3. The screen washing device according to claim 1, characterized in that: The resistance adjustment component includes a gear and a shell. A cavity is provided in the shell. A cam is rotatably arranged in the cavity. A cam surface is provided in the circumferential direction of the cam. The cam surface includes a plurality of wave peaks, and a wave trough is provided between adjacent wave peaks. A guide hole is provided on one side of the cavity. A push rod is slidably provided in the guide hole, and one end of the push rod contacts the cam surface on the cam. An adjusting screw is threadedly connected to one end of the guide hole, and a pressure spring is provided between the adjusting screw and the push rod. The gear is located outside the shell, and the gear and the cam are connected by a connecting shaft; the gear is meshed with the rack.

4. The screen washing device according to claim 1, characterized in that: The inner side of the positioning frame is provided with a positioning groove, and the screen is placed in the positioning groove; the lower end of the positioning frame is provided with a rotating shaft, and the lower end of the supporting frame is provided with an axis hole, and the rotating shaft is connected to the axis hole; the upper end of the positioning frame is connected to the output shaft of the motor.

5. The screen washing device according to claim 1, characterized in that: The upper end of the positioning frame is provided with a plunger hole, a plunger is provided in the plunger hole, a first liquid medium cavity is formed between the plunger and the lower end of the plunger hole, and a first return spring is provided between the plunger and the lower end of the plunger hole; Cylinder bodies are respectively provided on both sides of the positioning frame, and pistons are provided in the cylinder bodies. An end plate is provided on the end of the cylinder body close to the positioning frame, and a second return spring is provided between the end plate and the piston; a second liquid medium cavity is formed between the piston and an end of the cylinder body away from the end plate; a piston rod is connected to the piston, the piston rod passes through the end plate, and a movable limit block is provided at the front end of the piston rod; an avoidance cavity for accommodating the movable limit block is provided on the inner side of the positioning frame; a liquid medium channel is provided on the positioning frame, one end of the liquid medium channel is connected to the first liquid medium cavity, and the other end of the liquid medium channel is connected to a liquid guide tube, and the end of the liquid guide tube away from the liquid medium channel is connected to the second liquid medium cavity; liquid medium is filled in both the first liquid medium cavity and the second liquid medium cavity; A transmission ring corresponding to the plunger is provided on the support frame, the transmission ring is fixedly connected to the support frame, a contour surface is provided at the lower end of the transmission ring, the contour surface includes a plane area and a recessed area, and the upper end of the plunger contacts the contour surface; when the positioning frame is in the initial state, the positioning groove on the positioning frame faces the flushing component, and the upper end of the plunger contacts the recessed area on the contour surface.

6. The screen washing device according to claim 5, characterized in that: A roller is arranged on the upper end of the plunger.

7. The screen washing device according to claim 5, characterized in that: The liquid medium is hydraulic oil.

8. A method for using a screen washing device, based on the screen washing device according to claim 5, characterized in that: The specific method is as follows: Step 1: Place the screen to be washed into the positioning groove on the positioning frame, and make one side of the screen face the washing component; wash one side of the screen through the washing component; When the water flow impact force of the flushing component on the screen is greater than the moving resistance of the support frame, the screen and the support frame move in the direction away from the flushing component under the impact of the water flow. During the movement of the screen, as the distance between the screen and the flushing component increases, the water flow impact force on the screen gradually decreases until the water flow impact force is balanced with the moving resistance of the support frame, so that the screen reaches a balanced position; Step 2: When the flushing component has finished flushing one side of the screen, the flushing component is closed; the motor drives the positioning frame to rotate 180 degrees to turn the screen over; during the screen flipping process, the upper end of the plunger moves from the recessed area on the contour surface to the flat area on the contour surface, so that the plunger moves downward, so that the liquid medium in the first liquid medium cavity enters the second liquid medium cavity through the liquid medium channel and the liquid guide tube, and pushes the piston to move, so that the movable limit block extends from the avoidance cavity and presses against both sides of the screen; after the screen is flipped over, the flushing component is opened and the other side of the screen is flushed; after the flushing is completed, the flushing component is closed; Step 3: The motor drives the positioning frame to rotate 180 degrees to turn the screen over; during the turning process of the screen, the upper end of the plunger moves from the flat area on the contour surface to the concave area on the contour surface, and the plunger moves upward under the action of the first return spring, so that the liquid medium in the second liquid medium cavity flows back to the first liquid medium cavity through the liquid medium channel and the liquid guide tube, and the movable limit block releases the screen and retracts it into the avoidance cavity; Remove the rinsing screen from the positioning box.

Images