Improvements in or relating to a flotation cell scraper

By adopting a simplified scraper structure and spacing adjustment device in the flotation machine, the problem of scattered scraper wear points in existing flotation machines has been solved, thereby improving the stable operation and maintenance convenience of the flotation machine.

CN224672877UActive Publication Date: 2026-08-25GUIZHOU KAILIN GRP CO LTD
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Patent Information

Application Number
CN202521612462.9
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-07-31
Publication Date
2026-08-25
Estimated Expiration
2035-07-31

AI Technical Summary

Technical Problem

The existing flotation machine scraper structure has scattered wear points during operation, resulting in frequent equipment maintenance and affecting continuous and stable operation.

Method used

The first and second floats are installed on both sides of the drive unit through connecting components. Combined with the spacing adjustment device, the structure is simplified and the spacing between the floats and the inner wall of the tank can be flexibly adjusted. The arc plate and elastic scraper design are used to enhance adaptability and wear resistance.

Benefits of technology

The number of scrapers was reduced, the risk of wear was decreased, the operational stability and maintenance convenience of the flotation machine were improved, and the adaptability and economy of the equipment were enhanced.

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Abstract

The application discloses an improved structure of a scraper of a flotation machine. The application comprises a flotation tank body, a first floating plate, a second floating plate, a connecting component, a driving device and a distance adjusting device; the first floating plate and the second floating plate are installed on two sides of the driving device through the connecting component; the driving device is used for driving the first floating plate and the second floating plate to rotate; the connecting component is used for connecting the first floating plate and the second floating plate with the driving device; and the distance adjusting device is connected with the connecting component and is used for adjusting the distance between the first floating plate, the second floating plate and the inner wall of the flotation tank body.
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Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flotation machine structure, and particularly relates to an improved structure of a flotation machine scraper. BACKGROUND

[0002] The flotation machine is a common mineral processing equipment and is widely applied to a mineral separation process. A scraper structure for scraping foam products can be arranged in an existing flotation machine to realize centralized collection of the foam. However, in actual use, the existing scraper structure has the problems of more matching parts and scattered wear points in the running process, which easily leads to frequent equipment maintenance, increases the on-site operation and maintenance burden, and affects the continuous and stable operation of the equipment. CONTENT OF THE UTILITY MODEL

[0003] The present application provides an improved structure of a flotation machine scraper, which comprises: a flotation tank body, a first floating plate, a second floating plate, a connecting component, a driving device and a spacing adjustment device. The first floating plate and the second floating plate are installed on both sides of the driving device through the connecting component. The driving device is used for driving the first floating plate and the second floating plate to rotate. The connecting component is used for connecting the first floating plate and the second floating plate with the driving device. The spacing adjustment device is connected with the connecting component and is used for adjusting the spacing between the first floating plate, the second floating plate and the inner wall of the flotation tank body.

[0004] Optionally, the first floating plate and the second floating plate are both arc-shaped plate structures, and the arc-shaped surfaces are arranged towards the inner wall of the flotation tank body.

[0005] Optionally, the scraping edges of the first floating plate and the second floating plate are provided with elastic scraping pieces, and the elastic scraping pieces are attached to the inner wall of the flotation tank body.

[0006] Optionally, the connecting component comprises a mounting bracket and a fixing bolt, the first floating plate and the second floating plate are connected with the driving device through the mounting bracket and are locked by the fixing bolt.

[0007] Optionally, the driving device comprises a rotating shaft, a coupling and a motor, one end of the rotating shaft is connected with the first floating plate and the second floating plate, and the other end is connected with the output shaft of the motor through the coupling.

[0008] Optionally, the spacing adjustment device comprises an adjusting screw, a guide sleeve and a locking nut, the adjusting screw is arranged in the guide sleeve, the spacing between the floating plate and the tank body is changed by rotating the screw, and the spacing is fixed by the locking nut.

[0009] Optionally, the surfaces of the first and second floats are provided with a wear-resistant coating, which is a polyurethane or tungsten carbide material.

[0010] Optionally, a shock-absorbing pad is provided between the connecting component and the flotation tank to buffer the mechanical vibration generated during operation.

[0011] Optionally, the adjusting screw of the spacing adjustment device is provided with a scale mark to indicate the spacing value between the float and the flotation tank.

[0012] Optionally, the drive unit is covered with a protective cover, which is made of transparent plastic or stainless steel.

[0013] As can be seen from the above technical solutions, this application has the following advantages: This utility model provides an improved structure for the scraper of a flotation machine. By setting a first float and a second float, and symmetrically installing them on both sides of the drive device through connecting components, the number of scrapers is reduced while achieving effective scraping, simplifying the structural form and helping to reduce material usage costs and assembly complexity. At the same time, by providing a spacing adjustment device, the spacing between the floats can be flexibly adjusted according to the actual condition of the inner wall of the flotation tank, enhancing the adaptability and installation accuracy of the device, reducing the risk of wear and collision caused by improper scraper operation, thereby improving the overall operational stability and maintenance convenience of the flotation machine. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of an embodiment of an improved structure of a flotation machine scraper provided in this application. Detailed Implementation

[0015] In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and other terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to describe the relative positional relationship between the components or parts and do not specifically limit the specific installation orientation of each component or part.

[0016] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0017] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; 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, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0018] Furthermore, the structures, proportions, sizes, etc., drawn in the accompanying drawings of this application are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modification to the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects and purposes that this application can produce, should still fall within the scope of the technical content disclosed in this application.

[0019] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] See Figure 1 This application first provides an embodiment of an improved structure for a flotation machine scraper, comprising: Flotation tank 01, first float 02, second float 03, connecting component 04, drive device 05 and spacing adjustment device 06; The first float plate 02 and the second float plate 03 are mounted on both sides of the drive device 05 via a connecting component 04; The driving device 05 is used to drive the first float 02 and the second float 03 to rotate. The connecting component 04 is used to connect the first float plate 02 and the second float plate 03 to the driving device 05. The spacing adjustment device 06 is connected to the connecting component 04 and is used to adjust the spacing between the first float plate 02 and the second float plate 03 and the inner wall of the flotation tank 01.

[0021] In this embodiment, an improved structure for a flotation machine scraper is provided, which includes a flotation machine tank 01, a first float 02, a second float 03, a connecting component 04, a driving device 05, and a spacing adjustment device 06. The flotation machine tank 01 is the main support for the flotation operation, used to contain the slurry and cooperate with the scraper to scrape and collect the froth product.

[0022] The first float 02 and the second float 03 are respectively arranged on opposite sides of the drive device 05 and are respectively mounted on the drive device 05 by means of connecting parts 04. The connecting parts 04 can realize a stable connection between the floats and the drive device 05 and provide a certain degree of installation flexibility, facilitating the assembly and maintenance of the scraper structure. The first float 02 and the second float 03 are symmetrically arranged and rotate synchronously under the drive of the drive device 05, and are used to scrape the flotation foam inside the flotation tank 01.

[0023] The drive unit 05 is used to provide the required rotational torque for the scraper. Its specific structure can be electric or hydraulic. It can realize the continuous or intermittent movement of the scraper according to the production rhythm, thereby achieving directional and stable collection of flotation products.

[0024] Furthermore, to improve the compatibility and operational stability between the float plate and the inner wall of the flotation tank, a spacing adjustment device 06 is provided between the connecting component 04 and the tank body. This spacing adjustment device 06 is connected to the connecting component 04 and can adjust the distance between the float plate and the inner wall of the flotation tank 01, thereby ensuring that the float plate maintains a reasonable distance from the inner wall of the tank during operation, preventing contact or interference between the scraper and the tank wall, improving the stability of the device's operation, and extending its service life.

[0025] This structural design simplifies the arrangement of scrapers in the flotation machine, reducing the number of components while maintaining effective scraping function, making maintenance and replacement easier. The spacing adjustment device 06 further enhances the adaptability and operating accuracy of the device, improving the reliability and economy of the scraper structure in practical applications.

[0026] In an optional embodiment, both the first float plate 02 and the second float plate 03 are arc-shaped plate structures, with the arc-shaped surface facing the inner wall of the flotation tank 01.

[0027] In an optional embodiment, both the first float 02 and the second float 03 are arc-shaped plate structures, with their arc-shaped surfaces facing the inner wall of the flotation tank 01. By designing the floats as arc-shaped structures and arranging the arc-shaped surfaces facing the inner wall of the tank, a more closely fitted scraping trajectory can be achieved during the scraper's operation, thereby improving the cleaning and coverage rate of flotation foam in the edge area of ​​the tank.

[0028] Compared to traditional flat scrapers, curved floats can better adapt to the curvature changes of the tank's inner wall, reducing potential scraping dead zones or incomplete removal caused by mismatch between the scraper and the inner wall. Furthermore, the curved structure provides excellent guidance, effectively reducing fluid resistance during operation and further improving the energy efficiency of flotation operations.

[0029] This design combines structural compatibility with flow optimization, which helps improve the overall scraper system's operational efficiency and product quality stability during the flotation process.

[0030] In an optional embodiment, the scraping edges of the first float plate 02 and the second float plate 03 are provided with elastic scraper blades 07, which are attached to the inner wall of the flotation tank 01.

[0031] In an optional embodiment, the scraping edges of the first float plate 02 and the second float plate 03 are provided with elastic scraper blades 07, which are disposed in close contact with the inner wall of the flotation tank 01. The elastic scraper blades 07 are made of flexible material and have good resilience and wear resistance, and always maintain close contact with the inner wall of the tank during the rotation of the scraper blades.

[0032] By installing elastic scraper blades 07 on the scraper edge, the adaptability and coverage of the float plate when scraping flotation foam can be effectively enhanced. On the one hand, the elastic scraper blades 07 can automatically adapt to local structural errors or wear on the inner wall, avoiding incomplete scraping caused by tank deformation or scale buildup; on the other hand, their soft material properties also help reduce mechanical wear on the surface of the flotation tank 01, extending the service life of the equipment.

[0033] The introduction of this structure not only improves the scraping effect of the scraper, but also optimizes the mechanical coordination and ease of maintenance during equipment operation, further enhancing the stability and reliability of the entire flotation system.

[0034] In an optional embodiment, the connecting component 04 includes a mounting bracket and a fixing bolt, wherein the first float 02 and the second float 03 are connected to the driving device 05 via the mounting bracket and are locked by the fixing bolt.

[0035] In an optional embodiment, the connecting component 04 includes a mounting bracket and fixing bolts. The first float 02 and the second float 03 are connected to the drive device 05 via the mounting bracket and locked in place by the fixing bolts. This structural design is simple and robust, effectively ensuring the connection stability between the floats and the drive device 05, thereby guaranteeing the continuous reliability of the flotation machine during operation.

[0036] Specifically, the mounting bracket is used to fix the first float 02 and the second float 03 to both sides of the drive device 05, ensuring that the floats can rotate stably under the drive of the drive device 05. The mounting bracket can be made of metal materials with high strength and corrosion resistance to withstand external forces such as vibration and impact that may occur during the flotation process. The mounting bracket is firmly connected to the float by fixing bolts, which further enhances the tightness of the connection and prevents the floats from loosening or falling off due to vibration or other factors during operation.

[0037] Furthermore, this structure simplifies the installation and removal of the float plates, facilitating regular inspection, maintenance, or replacement. The design of the fixing bolts also enhances future maintenance, enabling staff to quickly adjust or replace the float plates when needed, reducing equipment downtime and further improving the overall operating efficiency of the flotation machine.

[0038] In an optional embodiment, the drive device 05 includes a rotating shaft 10, a coupling 11, and a motor 12. One end of the rotating shaft 10 is connected to the first float 02 and the second float 03, and the other end is connected to the output shaft of the motor 12 through the coupling 11.

[0039] In an optional embodiment, the drive device 05 includes a rotating shaft 10, a coupling 11, and a motor 12. One end of the rotating shaft 10 is connected to the first float 02 and the second float 03, and the other end is connected to the output shaft of the motor 12 via the coupling 11. This structural design allows the rotation of the floats to be driven by the motor 12, with power transmitted through the rotating shaft 10, thus driving the rotational movement of the first float 02 and the second float 03.

[0040] Specifically, the rotating shaft 10, as one of the core components of the drive unit 05, is connected to the float plate at one end via a mounting bracket, and to the output shaft of the motor 12 at the other end via a coupling 11, thereby realizing the transmission of power from the motor 12. The coupling 11, as an intermediate transmission component connecting the rotating shaft 10 and the motor 12, can effectively compensate for vibrations caused by installation errors or during flotation machine operation, ensuring a stable connection between the rotating shaft 10 and the output shaft of the motor 12, and improving transmission efficiency.

[0041] Motor 12 serves as the power source for drive device 05. It can be a motor with sufficient power and stability. Its output shaft is connected to coupling 11, driving the rotation of the float plate via rotating shaft 10. In practical applications, the speed of motor 12 can be adjusted according to actual needs to optimize the working efficiency of the scraper and the processing effect of the flotation process.

[0042] In an optional embodiment, the spacing adjustment device 06 includes an adjusting screw 13, a guide sleeve 14, and a locking nut 15. The adjusting screw 13 passes through the guide sleeve 14. The spacing between the float and the tank is changed by rotating the screw, and it is fixed by the locking nut 15.

[0043] In an optional embodiment, the spacing adjustment device 06 includes an adjusting screw 13, a guide sleeve 14, and a locking nut 15. The adjusting screw 13 passes through the guide sleeve 14, and the spacing between the float plate and the flotation tank is changed by rotating the screw, and is fixed by the locking nut 15. This structural design allows the spacing between the float plate and the flotation tank 01 to be precisely adjusted according to actual operating requirements, ensuring the working effect of the scraper and the stable operation of the flotation machine.

[0044] Specifically, the adjusting screw 13, as the core component for spacing adjustment, has one end connected to the flotation tank 01 or other supporting components via a guide sleeve 14, and the other end connected to the float plate or float plate support structure. The adjusting screw 13 can slide axially within the guide sleeve 14 through rotational movement, thereby changing the spacing between the float plate and the inner wall of the tank. By adjusting the spacing, the scraping effect of the float plate can be optimized to adapt to the flotation requirements under different materials and operating conditions.

[0045] The guide sleeve 14 guides the rotation and sliding of the adjusting screw 13, ensuring stability and accuracy during the adjustment process. The guide sleeve 14 can be made of wear-resistant and corrosion-resistant materials to withstand long-term use during the flotation process, ensuring its long-term reliability.

[0046] The locking nut 15 is used to fix the position of the adjusting screw 13, preventing it from loosening due to vibration or other external forces during flotation machine operation, and ensuring that the distance between the float plate and the tank remains stable throughout the entire operation. This locking method is simple and effective, allowing for quick adjustment and ensuring long-term stable operation.

[0047] The design of this spacing adjustment device 06 simplifies and expedites the maintenance and adjustment of the flotation machine. Operators can quickly adjust the spacing between the flotation plate and the tank as needed, optimizing the scraping effect during flotation and improving production efficiency. Simultaneously, this structure boasts strong adaptability and reliability, capable of meeting operational requirements under different working conditions and enhancing the overall performance and stability of the flotation machine.

[0048] In an optional embodiment, the surfaces of the first float plate 02 and the second float plate 03 are provided with a wear-resistant coating, which is a polyurethane or tungsten carbide material.

[0049] In an optional embodiment, the surfaces of the first float 02 and the second float 03 are provided with a wear-resistant coating, which is a polyurethane or tungsten carbide material. The application of this wear-resistant coating can effectively improve the wear resistance of the floats, extend their service life, reduce the frequency of maintenance during flotation machine operation, and thus improve production efficiency.

[0050] Specifically, the polyurethane wear-resistant coating possesses excellent wear resistance, elasticity, and impact resistance, effectively resisting friction with the slurry and other solid particles during flotation, thus preventing premature wear of the flotation plate surface. The polyurethane coating exhibits high stability during long-term operation of the flotation machine, adapting to the complex working environment and high-frequency workloads during flotation.

[0051] Tungsten carbide materials possess extremely high hardness and high-temperature resistance, making them excellent wear-resistant materials. They effectively protect the surface of the flotation plate under harsh working conditions, reducing performance degradation caused by wear. Tungsten carbide coatings also exhibit good corrosion resistance, maintaining efficient protection in flotation liquids for extended periods, making them particularly suitable for high-intensity, high-wear flotation operations.

[0052] By applying a polyurethane or tungsten carbide wear-resistant coating to the surfaces of the first flotation plate 02 and the second flotation plate 03, the durability of the parts of the scraper that come into contact with the slurry during flotation can be effectively improved, reducing the performance degradation of the flotation plate due to wear, thereby extending the overall service life of the flotation machine, reducing the frequency of maintenance and replacement, and lowering operating costs. Furthermore, the use of the wear-resistant coating can also maintain the flatness of the scraper surface and the scraping effect, improving the working efficiency and stability of the flotation machine.

[0053] In an optional embodiment, a shock-absorbing pad is provided between the connecting component 04 and the flotation tank 01 to buffer the mechanical vibration generated during operation.

[0054] In an optional embodiment, a shock-absorbing pad is provided between the connecting component 04 and the flotation tank 01 to buffer the mechanical vibration generated during operation. This shock-absorbing pad effectively reduces the impact of mechanical vibration generated during flotation machine operation on the connecting component 04 and the flotation tank 01, preventing loosening, wear, or damage due to vibration, thereby improving the stability and reliability of the equipment.

[0055] Specifically, the vibration damping pads can be made of elastic materials, such as rubber, polyurethane, or other materials with good shock absorption properties. This material can absorb and buffer the mechanical vibrations generated by scraper movement, slurry flow, and equipment vibration during flotation machine operation, preventing excessive vibration transmission to the connecting parts 04 and the flotation tank 01, reducing vibration-induced damage and fatigue, thereby extending the service life of the equipment.

[0056] The anti-vibration pads are installed between the connecting component 04 and the tank body, effectively preventing severe vibrations caused by direct contact, reducing mechanical wear, and ensuring the precise operation of the flotation machine's scraper system. Furthermore, the use of anti-vibration pads helps improve the stability of the entire flotation machine system, reducing equipment failures caused by vibration, thereby improving the flotation machine's production efficiency and safety.

[0057] By using anti-vibration pads, this embodiment can further improve the operational stability and lifespan of the flotation machine, reduce maintenance costs and repair frequency, and ensure the reliability and economy of the flotation machine under long-term, high-load operation.

[0058] In an optional embodiment, the adjusting screw 13 of the spacing adjustment device 06 is provided with a scale mark to indicate the spacing value between the float and the flotation tank 01.

[0059] In an optional embodiment, the adjusting screw 13 of the spacing adjustment device 06 is provided with a scale mark to indicate the spacing value between the float and the flotation tank 01. This scale mark provides a simple and intuitive way to precisely adjust the distance between the float and the tank, thereby ensuring the efficient operation of the flotation machine under different operating conditions.

[0060] Specifically, the scale markings on the adjusting screw 13 are evenly distributed along its length on its outer surface, with each mark representing a certain distance unit. When the operator rotates the adjusting screw 13, the scale markings can visually display the changing distance between the float and the tank, helping the user to quickly and accurately obtain the required spacing value during the adjustment process.

[0061] The advantage of this design is that operators can directly observe and adjust the spacing through the scale markings without using other measuring tools, greatly improving adjustment efficiency and accuracy. Furthermore, the clearly marked scale helps operators ensure consistent spacing during adjustment, avoiding unstable flotation results or damage to the scraper and tank caused by improper adjustment.

[0062] By setting scale markings on the adjusting screw 13, this embodiment can provide users with a simpler and more accurate operating experience, further improving the ease of use and reliability of the flotation machine.

[0063] In an optional embodiment, the drive unit 05 is externally covered by a protective cover made of transparent plastic or stainless steel.

[0064] In an optional embodiment, the drive unit 05 is externally covered by a protective cover made of transparent plastic or stainless steel. This protective cover is designed to improve the safety and reliability of the flotation machine.

[0065] Specifically, the protective cover effectively prevents external objects, dirt, or other impurities from entering the drive unit 05, reducing damage caused by external factors. Simultaneously, the protective cover also prevents damage to the drive unit 05 from mechanical vibrations or other shock waves generated during flotation machine operation, extending its service life.

[0066] Transparent plastic protective covers offer excellent transparency, allowing operators to monitor the operating status of the drive unit 05 at any time, thus ensuring equipment safety and facilitating daily inspections and maintenance. Stainless steel protective covers, on the other hand, offer superior corrosion resistance and durability, making them suitable for use in harsh working environments and effectively preventing damage from environmental factors such as humidity, high temperatures, and chemical corrosion.

[0067] By combining the protective cover with the drive unit 05, this embodiment can effectively improve the operational stability and safety of the flotation machine, while providing a convenient observation angle to ensure that operators can promptly detect and handle potential faults.

[0068] It should be noted that the above description of the disclosed embodiments enables those skilled in the art to implement or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An improved structure for a flotation machine scraper, characterized in that, include: Flotation tank, first float, second float, connecting components, drive unit and spacing adjustment device; The first float and the second float are mounted on both sides of the drive device via connecting components; The driving device is used to drive the first float and the second float to rotate. The connecting component is used to connect the first float and the second float to the drive device; The spacing adjustment device is connected to the connecting component and is used to adjust the spacing between the first float and the second float and the inner wall of the flotation tank.

2. The improved structure of the flotation machine scraper according to claim 1, characterized in that, Both the first float and the second float are arc-shaped plate structures, with the arc-shaped surface facing the inner wall of the flotation tank.

3. The improved structure of the flotation machine scraper according to claim 1, characterized in that, The scraping edges of the first and second floats are provided with elastic scrapers, which are attached to the inner wall of the flotation tank.

4. The improved structure of the flotation machine scraper according to claim 1, characterized in that, The connecting components include a mounting bracket and fixing bolts. The first float and the second float are connected to the drive device through the mounting bracket and locked by the fixing bolts.

5. The improved structure of the flotation machine scraper according to claim 1, characterized in that, The drive device includes a rotating shaft, a coupling, and a motor. One end of the rotating shaft is connected to the first float and the second float, and the other end is connected to the output shaft of the motor through the coupling.

6. The improved structure of the flotation machine scraper according to claim 1, characterized in that, The spacing adjustment device includes an adjusting screw, a guide sleeve, and a locking nut. The adjusting screw passes through the guide sleeve. The spacing between the float and the tank is changed by rotating the screw, and it is fixed by the locking nut.

7. The improved structure of the flotation machine scraper according to claim 1, characterized in that, The surfaces of the first and second floats are provided with a wear-resistant coating, which is a polyurethane or tungsten carbide material.

8. The improved structure of the flotation machine scraper according to claim 1, characterized in that, The connecting component is provided with a shock-absorbing pad between itself and the flotation tank to buffer the mechanical vibrations generated during operation.

9. The improved structure of the flotation machine scraper according to claim 1, characterized in that, The adjusting screw of the spacing adjustment device is equipped with a scale mark to indicate the spacing value between the float and the flotation tank.

10. The improved structure of the flotation machine scraper according to claim 1, characterized in that, The drive unit is covered by a protective cover, which is made of transparent plastic or stainless steel.