An LED light strip welding device

Abstract

This invention discloses an LED strip welding device, belonging to the technical field of welding devices. It includes a welding station, with a frame and guide rail slide mechanism fixed to the top surface of the welding station. A lifting plate is slidably mounted on the rear end of the frame via an electric push rod. Multiple welding gun mechanisms are slidably mounted on the rear side of the lifting plate, and multiple wire feeding mechanisms are mounted on the front side of the lifting plate. A dipping trough is slidably connected to the front end of the frame via an electric push rod. Sliders are fixed at both ends of the rear side of the dipping trough, and multiple piston cylinders are slidably mounted between two sliders via a slide rod. Each piston cylinder has a stopper rod slidably mounted at both ends sealed by a stopper body. A cleaning component is fixed to the outer end of each stopper rod, and a collection component is mounted at the bottom of the cleaning component. This invention removes surface oxides and welding slag by setting the cleaning component during the downward movement of the welding head, and achieves flux collection and quantitative dipping by using the collection component. The plunger mechanism, piston cylinders, and valve plate form a pneumatic linkage, realizing the coordinated operation of the cleaning component and the collection component.

Description

Technical Field

[0001] This invention relates to the field of welding equipment technology, specifically to an LED light strip welding device. Background Technology

[0002] As an important product in modern lighting and decoration, the welding process in the production of LED light strips is particularly critical. During LED light strip manufacturing, fine wires need to be precisely welded to the pads on the light strip substrate. Currently, automated welding equipment is widely used in this field, achieving continuous welding operations through precise welding gun mechanisms and wire feeding systems.

[0003] However, existing welding equipment still has some shortcomings in use: oxides and slag easily accumulate on the welding head during continuous welding, which leads to a decrease in heat transfer efficiency and affects the welding quality of subsequent welds; when the welding head is dipped in flux, the repeated dipping and accumulation of flux by the welding gun mechanism causes the dipping area to become concave, which can easily lead to insufficient flux dipping in subsequent welds. At the same time, it is not easy to control the amount of flux dipped, resulting in inconsistent welding quality of each weld and affecting the product quality of LED light strips.

[0004] To address the aforementioned issues, innovative designs are urgently needed based on existing approaches. Summary of the Invention

[0005] The purpose of this invention is to provide an LED strip welding device to solve the problems mentioned in the background. The technical solution of this invention addresses the problem that the existing technical solutions are too simplistic and provides a solution that is significantly different from the existing technology.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an LED strip welding device, comprising a welding station, a frame and a guide rail slide mechanism fixed on the top surface of the welding station, a lifting plate slidably mounted on the rear end of the frame via an electric push rod, multiple welding gun mechanisms slidably mounted on the rear side of the lifting plate, multiple wire feeding mechanisms mounted on the front side of the lifting plate, the inner top wall of the rear end of the frame connected to the lifting plate via multiple plunger mechanisms, each plunger mechanism having an interface at its lower side wall, and a dipping groove slidably connected to the front end of the frame via an electric push rod, with sliding rails fixed at both ends of the rear side of the dipping groove. The frame has multiple piston cylinders slidably mounted between two slides via a slide rod. Each piston cylinder has a stopper rod slidably mounted at both ends via a stopper body. A cleaning component is fixed to the outer end of each stopper rod. A collection component is mounted at the bottom of the cleaning component. Each piston cylinder has a second interface and a third interface on both sides of its top. Each second interface is connected to a first interface via a hose. A valve plate is slidably mounted inside the lower end of each third interface via a spring. A pin is slidably connected above each third interface via a bracket and a spring. A pressure rod is slidably connected to the top of the two slides via a spring.

[0007] Preferably, the plurality of welding gun mechanisms extend from the bottom of the lifting plate to the front side of the lifting plate, and the plurality of welding gun mechanisms and the plurality of piston cylinders are all synchronously and equally adjusted by a variable pitch screw and a motor.

[0008] Preferably, the internal channel of the third interface has a structure that is narrow at the top and wide at the bottom, and the valve plate closely abuts against the narrower channel opening from the inside of the third interface.

[0009] Preferably, the cleaning assembly includes two mounting brackets, which are respectively fixedly connected to the outer ends of the two piston rods of the same piston cylinder. Each mounting bracket is rotatably connected to a rotating roller, and the outer wall of each rotating roller is provided with a layer of sponge.

[0010] Preferably, the cleaning assembly further includes a gear rotatably connected to the mounting bracket, the gear being driven by the rotating shaft of the rotating roller via a synchronous belt and a synchronous pulley, and a long rack being fixed on the inner wall of the dipping tank at the position corresponding to the gear, with multiple gears meshing with the long rack for transmission.

[0011] Preferably, the collecting component includes two scrapers, which are respectively fixedly connected to the bottom of two mounting brackets of the cleaning component. One of the scrapers is fixedly connected to two support rods on its side wall. A floating frame is elastically slidably connected to the top surface of the two support rods. A dipping block is fixedly connected to the floating frame. The groove on the top of the dipping block corresponds to the shape of the welding head end in the welding gun mechanism.

[0012] Preferably, a first wedge block is fixedly connected to both ends of the floating frame, and a second wedge block is fixedly connected to both ends of the other scraper sidewall, wherein the second wedge block slides against the first wedge block.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. This invention, by setting up a cleaning assembly consisting of a piston cylinder, mounting brackets, and rotating rollers, utilizes pneumatic drive to bring the two mounting brackets closer together during the downward movement of the welding torch. This causes the sponge layer on the rotating rollers to fully contact the surface of the welding head. Simultaneously, the meshing transmission of gears and long racks causes the rotating rollers to rotate, effectively cleaning the residue on the surface of the welding head. This avoids the accumulation of oxide layers and welding slag on the surface of the welding head, ensures the consistency of welding quality at each welding point, and improves the welding yield.

[0015] 2. This invention uses a collection component consisting of a scraper, a floating frame, and a flux-dipping block. During the cleaning process, the interaction of the wedge-shaped blocks allows the flux-dipping block to be immersed in flux. After cleaning, the block automatically resets to allow the welding head to dip. This quantitative dispensing method avoids the welding head being repeatedly dipped, which can cause the area to become concave and affect the amount of flux applied. At the same time, the scraper's gathering effect maintains the high stability of the flux-dipping surface, ensuring the uniformity of flux application at each welding point and thus guaranteeing the stability of welding quality.

[0016] 3. This invention achieves automatic coordinated operation of the cleaning and holding components during the downward movement of the welding torch mechanism by setting up a pneumatic linkage consisting of a plunger mechanism, a piston cylinder, and a valve plate. The downward movement of the welding torch generates pneumatic pressure through the plunger mechanism, which sequentially drives the contact and cleaning actions of the cleaning component. Automatic reset after cleaning is achieved through the cooperation of the ejector pin and the valve plate, ensuring that each actuator completes its corresponding action in a precise timing sequence, simplifying the equipment control system, improving the reliability of action execution, and reducing the equipment failure rate. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the invention from a frontal view.

[0018] Figure 2 for Figure 1 Enlarged schematic diagram of the structure of section D in the middle;

[0019] Figure 3 This is a schematic diagram of the overall structure of the present invention from the rear side view;

[0020] Figure 4 for Figure 3 Enlarged schematic diagram of section A of the structure;

[0021] Figure 5 This is a schematic diagram of the guide rail slide mechanism of the present invention;

[0022] Figure 6 This is a schematic diagram of the structure of the dipping groove part of the present invention;

[0023] Figure 7 for Figure 6 Enlarged schematic diagram of section B of the structure;

[0024] Figure 8 This is a cross-sectional schematic diagram of the piston cylinder portion of the present invention;

[0025] Figure 9 for Figure 8 Enlarged schematic diagram of the C-section structure;

[0026] Figure 10 This is a schematic diagram of the cleaning component and the retrieval component in this invention;

[0027] Figure 11 This is a cross-sectional schematic diagram of the floating frame and support rod in this invention.

[0028] In the diagram: 1. Welding station; 2. Frame; 3. Guide rail slide mechanism; 4. Electric push rod one; 5. Lifting plate; 6. Welding gun mechanism; 7. Wire feeding mechanism; 8. Plunger mechanism; 9. Collection assembly; 91. Scraper; 92. Support rod; 93. Floating frame; 94. Dipping block; 95. First wedge block; 96. Second wedge block; 10. Interface one; 11. Electric push rod two; 12. Dipping trough; 13. Slide; 14. Piston cylinder; 15. Plug rod; 16. Cleaning assembly; 161. Mounting frame; 162. Rotary roller; 163. Gear; 164. Long rack; 17. Interface two; 18. Interface three; 19. Valve plate; 20. Ejector pin; 21. Pressure rod. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Please see Figures 1 to 11This invention provides a technical solution: an LED strip welding device, including a welding station 1, a frame 2 and a guide rail slide mechanism 3 fixed on the top surface of the welding station 1, a lifting plate 5 slidably mounted on the rear end of the frame 2 via an electric push rod 4, multiple welding gun mechanisms 6 slidably mounted on the rear side of the lifting plate 5, the welding gun mechanisms 6 having welding heads and solder wire outlets, multiple wire feeding mechanisms 7 mounted on the front side of the lifting plate 5 for feeding solder wire, multiple plunger mechanisms 8 connecting the inner top wall of the rear end of the frame 2 to the lifting plate 5, each plunger mechanism 8 having an interface 10 at the lower end of its side wall, a dipping tank 12 slidably connected to the front end of the frame 2 via an electric push rod 11, the dipping tank 12 containing flux, slides 13 fixed at both ends of the rear side of the dipping tank 12, multiple piston cylinders 14 slidably mounted between two slides 13 via a slide rod, each piston cylinder 14 having two ends connected via The plug body is sealed and slidably equipped with a plug rod 15. Each plug rod 15 has a cleaning component 16 fixed at its outer end for cleaning the weld head after welding to prevent residue accumulation from affecting the welding effect. The bottom of the cleaning component 16 is equipped with a holding component 9 for holding an appropriate amount of flux for the weld head to dip into, to prevent the high-temperature weld head from contacting a large amount of flux, which would cause the temperature to drop too quickly and form an oxide layer, thus leading to inconsistent welding quality when welding multiple weld points. Each piston cylinder 14 has a second interface 17 and a third interface 18 on both sides of its top. Each second interface 17 is connected to the first interface 10 via a hose. Each third interface 18 has a valve plate 19 slidably installed inside its lower end via a spring. Each third interface 18 has a pin 20 slidably connected above it via a bracket and a spring. The top of the two slides 13 is slidably connected to a pressure rod 21 via a spring.

[0031] During use, the LED strip to be welded and the connecting wire are each fixed to the moving plate on top of the guide rail slide mechanism 3. When they move to be aligned with the welding gun mechanism 6, they begin step-by-step conveying, allowing the welding gun mechanism 6 to weld each welding point sequentially. During the welding process, the electric push rod 4 drives the lifting plate 5 downward, causing multiple welding gun mechanisms 6 to descend to the welding point of the LED strip. The wire feeding mechanism 7 then feeds solder wire to cooperate with the welding head for the welding operation.

[0032] After a welding operation is completed, the welding torch mechanism 6 rises and resets. At this time, the electric push rod 11 pulls the dip trough 12 to position it below the welding torch mechanism 6. Then, the welding torch mechanism 6 descends to perform the cleaning and flux dipping process. In the first stage of descent, when the lifting plate 5 descends, it pulls down the plunger mechanism 8, allowing the gas in the plunger mechanism 8 to enter the piston cylinder 14 through the interface 10, the hose, and the interface 17. This causes the two plug rods 15 at both ends of the piston cylinder 14 to retract, thereby bringing the cleaning component 16 connected to the two plug rods 15 closer to and initially fitting against the welding head of the welding torch mechanism 6. At the same time, the mutual approach of the cleaning components 16 causes the scooping component 9 to descend and immerse itself in the flux in the dip trough 12.

[0033] In the second downward phase, the continued descent of the welding torch mechanism 6 begins to drive the pressure rod 21 downward. The pressure rod 21 presses the ejector pin 20 into the interface 3 18 and slides downward until it contacts the valve plate 19. During this process, the cleaning component 16 further squeezes and scrapes the welding head of the welding torch mechanism 6 to clean its outer wall and remove the residue on the outer wall of the welding head during welding.

[0034] In the third downward stage, the ejector pin 20 pushes the valve plate 19 downward, opening the interface 3 18, which depressurizes the rod chamber inside the piston cylinder 14. The two piston rods 15 extend and reset under the action of spring force, and drive the two mounting brackets 161 to reset. The gas that the plunger mechanism 8 continues to pressurize is discharged through the interface 3 18. Thus, after the welding torch mechanism 6 has finished cleaning, the cleaning component 16 is quickly reset and will not hinder the continued downward movement of the welding torch mechanism 6. At the same time, the reset of the cleaning component 16 causes the flux-containing collection component 9 to rise, and the welding head of the welding torch mechanism 6 is inserted into the collection component 9 to dip into the flux.

[0035] After dipping, the welding gun mechanism 6 moves upward. At this time, since the cleaning component 16 has been reset, it will not scrape off the flux dipped by the welding gun mechanism 6. After the ejector pin 20 disengages from the interface 3 18, the interface 3 18 returns to the closed state through the sealing of the valve plate 19. Then, the electric push rod 2 11 pushes open the dipping tank 12, and the electric push rod 1 4 drives the lifting plate 5 to move down to the bottom, so that the welding gun mechanism 6 can weld the next welding position of the LED light strip. Through the above work cycle, the welding work of the LED light strip and the connecting wire is completed.

[0036] Multiple welding gun mechanisms 6 extend from the bottom of the lifting plate 5 to the front side of the lifting plate 5. The multiple welding gun mechanisms 6 and multiple piston cylinders 14 are all synchronously and equally adjusted by variable pitch screws and motors, so as to cope with the welding conditions of LED light strips of various specifications.

[0037] Please see Figure 8 The internal channel of interface 3 18 has a structure that is narrow at the top and wide at the bottom. The valve plate 19 is tightly abutted against the narrower channel opening at the top from inside interface 3 18. When there is no external force, interface 3 18 is in a closed state under the action of valve plate 19.

[0038] The cleaning component 16 includes two mounting brackets 161, which are fixedly connected to the outer ends of the two piston rods 15 of the same piston cylinder 14. Each mounting bracket 161 is rotatably connected to a rotating roller 162, and the outer wall of each rotating roller 162 is provided with a layer of sponge. In the first and second stages of the downward movement of the welding gun mechanism 6, the sponge on the outer wall of the rotating roller 162 squeezes and scrapes the outer wall of the welding head to achieve the cleaning purpose, reduce the residue on the outer wall of the welding head, and make the welding quality of each welding point of the LED light strip tend to be consistent, reducing the situation of poor welding caused by the accumulation of residue.

[0039] Please see Figure 9The cleaning assembly 16 also includes a gear 163 rotatably connected to the mounting bracket 161. The gear 163 and the rotating shaft of the roller 162 are driven by a synchronous belt and a synchronous pulley. A long rack 164 is fixed on the inner wall of the dipping tank 12 at the position corresponding to the gear 163. Multiple gears 163 mesh with the long rack 164 for transmission.

[0040] Specifically, in the first and second stages of the downward movement of the welding torch mechanism 6, when the two mounting brackets 161 move closer to each other, the gear 163 on the mounting bracket 161 meshes with the long rack 164 for transmission. The rotation of the gear 163 is transmitted through the synchronous belt and synchronous pulley, causing the rotating roller 162 to rotate. This allows the sponge on the outer wall of the rotating roller 162 to achieve a better cleaning effect through squeezing and rotation.

[0041] The collection component 9 includes two scrapers 91, which are fixedly connected to the bottom of the two mounting brackets 161 of the cleaning component 16. Two support rods 92 are fixedly connected to the side wall of one of the scrapers 91. A floating frame 93 is elastically slidably connected to the top surface of the two support rods 92. Under the action of elastic force, the floating frame 93 can automatically spring up after the external force is removed. A dipping block 94 is fixedly connected to the floating frame 93. The groove on the top of the dipping block 94 corresponds to the shape of the end of the welding head in the welding gun mechanism 6.

[0042] Specifically, when soldering LED strips, commonly used fluxes are paste flux and liquid flux. When using paste flux, the repeated dipping of the soldering gun mechanism 6 causes the dipping area to become concave, which can easily lead to insufficient flux in subsequent dipping. The mutual approach of the mounting brackets 161 drives the scraper 91 to move, which helps to gather the paste flux towards the dipping position. When using liquid flux, the dipping block 94 can be immersed in the flux for scooping through the raising and lowering of the floating frame 93.

[0043] The floating frame 93 is fixedly connected to both ends of the first wedge block 95, and the scraper 91 is fixedly connected to both ends of the side wall of the second wedge block 96. The second wedge block 96 slides against the first wedge block 95.

[0044] Specifically, in the first and second stages of the downward movement of the welding torch mechanism 6, the mutual approach of the two mounting brackets 161 causes the scraper 91 to move synchronously closer. During this process, the first wedge block 95 and the second wedge block 96 abut and slide. The first wedge block 95 is squeezed and causes the floating frame 93 to descend. The dip block 94 picks up the flux. In the third stage of the downward movement of the welding torch mechanism 6, the reset of the two mounting brackets 161 causes the first wedge block 95 to separate from the second wedge block 96. The floating frame 93 drives the dip block 94 containing the flux to reset.

[0045] Working Principle: The LED strips to be welded and the connecting wires are fixed on the moving plate of the guide rail slide mechanism 3. Through stepping conveying, each welding point is sequentially aligned with the welding gun mechanism 6. During welding, the electric push rod 4 drives the lifting plate 5 downwards, causing multiple welding gun mechanisms 6 to descend synchronously to the welding position. At this time, the wire feeding mechanism 7 precisely feeds the solder wire, working in conjunction with the welding head to complete the welding operation. After welding is completed, the welding gun mechanism 6 rises and resets, and the electric push rod 11 pushes the dipping trough 12 to move directly below the welding gun mechanism 6. During cleaning and dipping, the downward movement of the welding gun mechanism 6 is divided into three stages: In the first stage of downward movement, the downward pull of the lifting plate 5 causes the gas in the plunger mechanism 8 to enter the piston cylinder 14 through the interface 10 and the hose, pushing the two plunger rods 15 to retract and causing the mounting brackets 161 to move closer together. Simultaneously, the approach of the mounting brackets 161 causes the scraper 91 to gather the flux. The interaction between the first wedge block 95 and the second wedge block 96 causes the floating frame 93 to drive the dipping block 94 downwards to immerse it in the flux. In the second downward phase, the welding torch mechanism 6 continues to descend, pushing the pressure rod 21 downward and pressing the ejector pin 20 into interface 3 18. At this time, the mounting frame 161 moves closer, ensuring that the sponge layer of the rotating roller 162 makes full contact with the welding head. The meshing transmission of the gear 163 and the long rack 164 causes the rotating roller 162 to rotate, achieving cleaning of the welding head surface. In the third downward phase, the ejector pin 20 pushes open the valve plate 19, opening the pressure relief channel of interface 3 18. After the piston cylinder 14 is depressurized in the rod chamber, the plug rod 15 quickly resets under the action of the spring, driving the cleaning component 16 to detach from the welding head. At the same time, the floating frame 93, under the action of the spring, drives the flux-filled dipping block 94 to rise, and the welding head accurately inserts into the dipping block 94 to complete the flux dipping. After dipping is completed, the welding torch mechanism 6 rises and resets, and interface 3 18 automatically closes under the action of the valve plate 19, restoring the sealed state. The electric push rod 2 11 moves the dipping tank 12 away from the working area, and the equipment is ready for the next welding cycle. The position spacing between the welding gun mechanism 6 and the cleaning component 16 can be adjusted according to the welding requirements of LED light strips of different specifications by means of a variable pitch screw adjustment mechanism.

[0046] Contents not described in detail in this specification are prior art known to those skilled in the art. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. Terms such as "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," and "tail" indicate orientations or positional relationships based on the accompanying drawings, and are used only for ease of description and simplification, not to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0047] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An LED strip welding device, comprising a welding station (1), characterized in that: The top surface of the welding station (1) is fixed with a frame (2) and a guide rail slide mechanism (3). The rear end of the frame (2) is slidably mounted with a lifting plate (5) via an electric push rod (4). Multiple welding gun mechanisms (6) are slidably mounted on the rear side of the lifting plate (5). Multiple wire feeding mechanisms (7) are mounted on the front side of the lifting plate (5). The inner top wall of the rear end of the frame (2) is connected to the lifting plate (5) via multiple plunger mechanisms (8). Each plunger mechanism (8) has an interface (10) at the lower end of its side wall. The front end of the frame (2) is slidably connected with a dipping groove (12) via an electric push rod (11). Sliders (13) are fixed at both ends of the rear side of the dipping groove (12). A slide rod is slidably mounted between two sliders (13). Multiple piston cylinders (14), each piston cylinder (14) has a piston rod (15) that slides through a piston body at both ends, and a cleaning component (16) is fixed at the outer end of each piston rod (15). A collection component (9) is installed at the bottom of the cleaning component (16). Each piston cylinder (14) has a second interface (17) and a third interface (18) on both sides of its top. Each second interface (17) is connected to a first interface (10) through a hose. Each third interface (18) has a valve plate (19) that slides through a spring inside its lower end. Each third interface (18) has a pin (20) that slides through a bracket and a spring above it. The tops of the two slides (13) are connected to a pressure rod (21) that slides through a spring.

2. The LED strip welding device according to claim 1, characterized in that: Multiple welding gun mechanisms (6) extend from the bottom of the lifting plate (5) to the front side of the lifting plate (5), and multiple welding gun mechanisms (6) and multiple piston cylinders (14) are all synchronously and equidistantly adjusted by a variable pitch screw and a motor.

3. The LED strip welding device according to claim 1, characterized in that: The internal channel of the third interface (18) has a structure that is narrow at the top and wide at the bottom, and the valve plate (19) closely abuts against the narrower channel opening above the third interface (18).

4. The LED strip welding device according to claim 1, characterized in that: The cleaning assembly (16) includes two mounting brackets (161), which are respectively fixedly connected to the outer ends of the two piston rods (15) of the same piston cylinder (14). Each mounting bracket (161) is rotatably connected to a rotating roller (162), and each rotating roller (162) has a layer of sponge on its outer wall.

5. The LED strip welding device according to claim 4, characterized in that: The cleaning assembly (16) also includes a gear (163) rotatably connected to the mounting bracket (161). The gear (163) and the rotating shaft of the roller (162) are driven by a synchronous belt and a synchronous pulley. A long rack (164) is fixed on the inner wall of the dipping trough (12) at the position corresponding to the gear (163). Multiple gears (163) mesh with the long rack (164) for transmission.

6. The LED strip welding device according to claim 5, characterized in that: The collecting assembly (9) includes two scrapers (91), which are fixedly connected to the bottom of the two mounting brackets (161) of the cleaning assembly (16). Two support rods (92) are fixedly connected to the side wall of one of the scrapers (91). A floating frame (93) is elastically slidably connected to the top surface of the two support rods (92). A dipping block (94) is fixedly connected to the floating frame (93). The groove on the top of the dipping block (94) corresponds to the shape of the welding head end in the welding gun mechanism (6).

7. The LED strip welding device according to claim 6, characterized in that: The floating frame (93) is fixedly connected to two ends of a first wedge block (95), and the scraper (91) is fixedly connected to two ends of a second wedge block (96). The second wedge block (96) slides against the first wedge block (95).

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