A laboratory flotation dewatering all-in-one machine and a flotation dewatering method

Abstract

The present application belongs to the technical field of laboratory flotation dewatering equipment, and particularly relates to a laboratory flotation dewatering all-in-one machine and a flotation dewatering method. A coaxial sleeve is arranged outside the flotation barrel, and the coaxial sleeve is driven by a power source. An area between the coaxial sleeve and the flotation barrel constitutes a centrifugal chamber. A weir ring is coaxially mounted on the barrel mouth of the flotation barrel, and a sealed inner guide rail module is formed between the bottom surface of the weir ring and the barrel mouth of the flotation barrel. A scraper for scraping bubbles is arranged on the weir ring. A sealed outer guide rail module is formed between the upper part of the coaxial sleeve and the outer wall of the weir ring and between the lower part of the coaxial sleeve and the outer wall of the flotation barrel. The friction force at the inner guide rail module and / or the friction force at the outer guide rail module can be adjusted. The present application can automatically switch between overflow bubble discharge and scraper bubble scraping, and can organically combine the flotation process and the dewatering process under the premise of ensuring the volume of the flotation chamber, greatly simplifying the experimental process of mineral processing experiments.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of laboratory flotation dewatering equipment, and particularly relates to a laboratory flotation dewatering all-in-one machine and a flotation dewatering method. BACKGROUND

[0002] Flotation is to achieve targeted recovery according to the difference in physical and chemical properties of the mineral surface. With the change of technology, the flotation machine gradually develops towards large-scale, high-efficiency and energy-saving. For example, the single-tank 45m 3 XJM type coal mechanical stirring flotation machine and the single-tank 320m 3 air-charged mechanical stirring mine flotation machine have been successfully applied in industry. The flotation experiment in the laboratory is an important part of the ore selectivity research and the basis for the enlargement of the industrial flotation machine. Considering the relatively small environment of the laboratory, the traditional flotation machine has problems such as large volume, heavy weight and relatively slow foam product discharge speed. Based on this, there are also related laboratory flotation systems studied at present, such as XFD series laboratory mechanical stirring flotation machine, XFG series laboratory pneumatic stirring flotation machine and JJF series laboratory air-charged flotation machine. The XFD series laboratory mechanical stirring flotation machine is a common experimental flotation machine model, which uses mechanical stirring to mix the ore and reagents, and realizes the flotation process through the contact between the bubbles and the ore particles. The XFG series laboratory pneumatic stirring flotation machine is similar to the XFD series, but it uses pneumatic stirring to fully mix the reagents and the ore, and then performs the flotation experiment. The JJF series laboratory air-charged flotation machine generates bubbles through rotating impellers and realizes flotation by using the adhesion of the bubbles to the ore particles, which is commonly used for flotation experiments of large particles or high-density ores. Although the above-mentioned laboratory flotation machines meet the working requirements of the laboratory environment, they all abandon the machine scraping method, and manual scraping is required when the thickness of the foam layer changes during the experiment, which increases the probability of data error. In addition, the coal slime obtained by flotation needs to go through subsequent filter pressing and drying steps, and the experimental process is complicated. However, if the current laboratory flotation system is combined with the filter pressing and drying process, the number of accessories in the flotation tank will be increased and the volume of the flotation chamber will be further squeezed, which will obviously lead to the problem of insufficient single flotation amount, which needs to be solved urgently. SUMMARY

[0003] The purpose of the present application is to overcome the shortcomings of the prior art, and to provide a laboratory flotation dewatering all-in-one machine. The present application can automatically switch between overflow foam and scraper scraping, and can organically combine the flotation process with the dewatering process while ensuring the volume of the flotation chamber, greatly simplifying the experimental process of mineral processing experiments.

[0004] To achieve the above-mentioned purpose, the following technical solutions are adopted in the present application:

[0005] The application discloses a laboratory flotation dewatering all-in-one machine, which comprises a flotation barrel with a flotation function, characterized in that: an outer sleeve coaxial with the flotation barrel is provided with an outer sleeve driven by a power source, a centrifugal chamber is formed between the outer sleeve and the flotation barrel, a feed inlet for foam products at a bubble overflow ring is formed at an upper portion of the centrifugal chamber, centrifugal water is filtered out through filter holes at a sleeve wall of the outer sleeve and enters a centrifugal water outlet, and a clean coal outlet is arranged at a bottom portion of the centrifugal chamber.

[0006] A overflow ring is coaxially arranged at a barrel opening of the flotation barrel, a bottom ring surface of the overflow ring and the barrel opening of the flotation barrel form a sealed inner guide rail module, a scraper for scraping bubbles is arranged on the overflow ring, a sealed outer guide rail module is formed between an outer wall of the overflow ring and an upper portion of the outer sleeve and between an outer wall of the flotation barrel and a lower portion of the outer sleeve, and the friction force at the inner guide rail module and / or the friction force at the outer guide rail module is adjustable.

[0007] Preferably, the inner wall of the outer sleeve is arranged with upwardly and inwardly extending upper radial support rods and lower radial support rods, the outer wall of the overflow ring is coaxially arranged with ring-shaped upper groove bodies corresponding to the height of the upper radial support rods, the outer wall of the flotation barrel is coaxially arranged with ring-shaped lower groove bodies corresponding to the height of the lower radial support rods, and each groove body is a T-shaped groove; the inner extending ends of the upper radial support rods and the lower radial support rods are arranged with T-shaped inner clamping tenons; the inner clamping tenon of the upper radial support rod is clamped into the groove cavity of the upper groove body to form an upper guide rail assembly, and a gap for the falling of ore slurry is formed at the upper guide rail assembly; the inner clamping tenon of the lower radial support rod is clamped into the groove cavity of the lower groove body to form a lower guide rail assembly, and a space for the falling of clean coal is formed at the lower guide rail assembly.

[0008] Preferably, a docking ring groove with an upward opening is coaxially arranged at the barrel opening of the flotation barrel, and a matching ring groove with a downward opening is coaxially arranged at the bottom ring surface of the overflow ring, so that the groove cavity of the matching ring groove is clamped into the outer groove wall of the docking ring groove; a sealing ring is arranged between the docking ring groove and the matching ring groove.

[0009] Preferably, a clamping screw is clamped into the outer groove wall of the docking ring groove after penetrating the outer groove wall of the matching ring groove in the radial direction, and the friction force at the inner guide rail module is adjusted by adjusting the clamping force of the clamping screw and the outer groove wall of the matching ring groove.

[0010] Preferably, a wedge-shaped friction block is arranged at the docking ring groove, and the friction force at the inner guide rail module is adjusted by adjusting the clamping force of the wedge-shaped surface of the wedge-shaped friction block and the wedge-shaped matching surface at the matching ring groove.

[0011] Preferably, the sealing ring is arranged at the groove cavity bottom surface of the matching ring groove, and is a replaceable structure, so as to adjust the friction force at the inner guide rail module.

[0012] Preferably, a flow guide ring is coaxially arranged at the outer wall of the flotation barrel, the height of the flow guide ring gradually decreases outwardly at the flotation barrel, and a gap exists between the flow guide ring and the outer sleeve, so as to guide the foam product to the inner wall of the outer sleeve.

[0013] Preferably, an outer box body is coaxially arranged outside the outer sleeve, a centrifugal water collection cavity is formed between the outer box body and the outer sleeve, and a centrifugal water outlet is arranged at the bottom of the centrifugal water collection cavity; an outer tenon is arranged at the outer extension end of each radial support rod, T-shaped groove-shaped upper guide rail ring grooves and lower guide rail ring grooves corresponding to the height of each radial support rod are arranged at the inner wall of the outer box body, the outer tenon is clamped into the corresponding guide rail ring groove and forms a guide rail cooperation; the outer tenon and each guide rail ring groove matched therewith, and the inner tenon and each groove body matched therewith together form the outer guide rail module.

[0014] Preferably, a motor chamber is arranged at the centrifugal water collection cavity, a power motor constituting the power source is arranged in the motor chamber, an outer gear ring is coaxially arranged at the outer wall of the outer sleeve, and the power motor is engaged with the outer gear ring through gear transmission.

[0015] Preferably, the flotation dehydration method applies a laboratory flotation dehydration all-in-one machine, characterized in that: the friction force of the outer guide rail module is f, the friction force of the inner guide rail module is F; a foam layer thickness threshold A is set, if the current foam layer thickness is less than A, F>f, at this time the scraper does not work; if the current foam layer thickness is greater than or equal to A, F≤f, at this time the overflow ring produces a rotary motion relative to the flotation barrel, and the scraper fixed on the overflow ring works; F is adjusted under the premise of F≤f, so as to control the scraping speed of the scraper and realize the adjustment of the foam product discharge rate.

[0016] The beneficial effects of the present application are:

[0017] 1) The design concept of the present application is that the minerals floated in the laboratory are not fixed, the types and components of the minerals are often changed, so that the thickness of the foam layer in the flotation barrel changes. When the thickness of the foam layer changes, simply relying on the traditional overflow to discharge the foam obviously has defects. Therefore, the present application adopts the scraping method to assist the flotation barrel to discharge the foam product.

[0018] To this end, the moving element fitting place mentioned in the present application is all guide rail fitting, and the inner guide rail module at the top of the flotation barrel has certain adjustable friction, of course, the outer guide rail module can also have certain adjustable friction, or both; at this time, through the adjustment of the friction, F<=f, so that the overflow ring at the top of the flotation barrel can be driven to rotate at low speed relative to the flotation barrel body; the friction changes continuously, so that the rotation speed can be adaptively changed. When the thickness of the foam layer increases, appropriately increase or decrease the friction of one of the modules, the overflow ring at the top of the flotation barrel rotates, and the scraper also works to scrape the foam product, which can increase the discharge rate of the foam product. When the thickness of the foam layer is within the normal range, adjust the friction of one of the modules until F>f, at this time, the scraper does not need to work, and the overflow can discharge the foam product.

[0019] At this point, it can be known that the present application can automatically switch between overflow type bubble discharge and scraper bubble scraping, and can realize flexible and organic combination of the flotation process and the dehydration process through the externally mounted overflow ring or even the outer sleeve under the premise of ensuring the volume of the flotation chamber, greatly simplifying the experimental process of mineral processing experiment, and the effect is remarkable. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present application;

[0021] Figure 2 It is a partial enlarged view of I part of Figure 1 .

[0022] The actual correspondence between the various labels and component names of the present application is as follows:

[0023] a-flotation chamber; b-centrifugal chamber; c-centrifugal water collection chamber;

[0024] 10-flotation barrel; 11-guide ring;

[0025] 20-outer sleeve; 21-filter hole; 22-outer gear ring;

[0026] 30-overflow ring;

[0027] 40-inner guide rail module; 41-abutment ring groove; 42-mating ring groove; 43-tightening screw; 44-sealing ring;

[0028] 50-outer guide rail module; 51-upper radial support rod; 52-lower radial support rod; 53-upper groove body; 54-lower groove body; 55-upper guide rail ring groove; 56-lower guide rail ring groove;

[0029] 60-scraper;

[0030] 70-power motor;

[0031] 80-outer box body. Detailed Implementation

[0032] For ease of understanding, this section combines... Figures 1-2 The specific structure and operation of the present invention are further described below:

[0033] The basic carrier of this invention adopts a jet-stirred column flotation machine, which combines the advantages of both mechanically stirred flotation machines and flotation columns. It can not only achieve full mixing of reagents and pulp through the jet stirring system, and ensure that the pulp is fully stirred during the flotation process; at the same time, it also relies on the coordinated control of overflow foaming and scraping foam by a scraper 60, eliminating the need for manual foam scraping, thus effectively addressing the situation where the foam layer thickens due to changes in the composition of the flotation minerals.

[0034] In actual design, the entire flotation machine is divided into two parts: flotation tank 10 and external components.

[0035] For the flotation tank 10 itself, such as Figure 1 As shown, an agitator shaft with a stirring paddle is coaxially mounted inside the agitator shaft, which is driven by an upper impeller located at the top of the agitator shaft. A guide sleeve is coaxially mounted outside the agitator shaft, and a funnel-shaped guide port with a smaller top and a larger bottom is arranged at the bottom of the guide sleeve. The slurry enters through the slurry inlet pipe, and then mixes with the air and / or reagents at the air and reagent inlet. It is then radially jetted onto the blades of the upper impeller, and then falls into the area where the agitator is located through the gap between the guide sleeve and the agitator shaft.

[0036] For external components, these include overflow ring 30, outer sleeve 20, and even outer casing 80, among which:

[0037] During assembly, such as Figures 1-2 As shown, the mating groove 41 at the top of the flotation tank 10 and the mating groove 42 at the bottom of the overflow ring 30 interlock to form a closed-loop inner guide rail module 40, thereby enabling the overflow ring 30 to rotate at low speed under specific conditions. A scraper 60 is arranged inside the overflow ring 30. When the overflow ring 30 rotates at low speed, the scraper 60 can scrape out the foam product in the foam layer.

[0038] The outermost layer of the whole device is the centrifugal water collecting cavity c. The centrifugal water collecting cavity c is internally provided with the filter screen-shaped outer sleeve 20 with filter holes 21, and externally provided with the outer box body 80 with a steel plate structure of a certain strength. The centrifugal water collecting cavity c is used for collecting centrifugal water and using the outer box body 80 as the outer shell of the device to isolate the rotation of the outer sleeve 20 and play a safety protection role. The upper part of the centrifugal water collecting cavity c is provided with two closed independent square spaces for installing the power motor 70. The power motor 70 can be a small variable frequency motor. The bottom of the centrifugal water collecting cavity c is provided with a centrifugal water outlet. During work, the power motor 70 drives the outer sleeve 20 to rotate through gear meshing cooperation with the outer gear ring 22.

[0039] As shown in Figure 1 , between the flotation cavity a of the flotation barrel 10 and the centrifugal water collecting cavity c is the centrifugal chamber b. In the design, the centrifugal chamber b is matched with the outer wall of the flotation barrel 10 and the inner wall of the outer box body 80 through four annular guide rails, and the radial support rods connected with the four annular guide rails are fixed on the outer sleeve 20. More specifically, as shown in Figures 1-2 , the inner clamping tenon of the upper radial support rod 51 is clamped into the upper groove body 53, and the outer clamping tenon is clamped into the upper guide rail ring groove 55; the inner clamping tenon of the lower radial support rod 52 is clamped into the lower groove body 54, and the outer clamping tenon is clamped into the lower guide rail ring groove 56; thereby, the outer guide rail module 50 is formed by combination. In the design, the friction of each part of the outer guide rail module 50 can be consistent. When the friction is inconsistent, the maximum friction is calculated.

[0040] In the centrifugal chamber b, the outer wall of the flotation barrel 10 is provided with a flow guide ring 11 with a flow guide slope with a gradually downward slope, which is used for guiding the foam product to the inner wall of the filter screen-shaped outer sleeve 20. In the actual design, a spraying device can also be installed in the upper space of the centrifugal chamber b, which is used for defoaming the foam product and preventing the filter holes 21 of the outer sleeve 20 from being blocked.

[0041] As shown in Figure 1 , the actual working process of the present application is as follows:

[0042] The experimental sample is prepared into a slurry, and is pumped into the slurry feeding pipe at high speed under pressure. Due to the high flow rate, negative pressure is generated, and air and reagents are sucked in. The slurry is injected into the guide sleeve, and impacts the upper impeller. Then the slurry flows downward along the guide sleeve. The upper impeller drives the stirring paddle to rotate, thereby achieving the stirring function. At this time, the slurry and the reagents are in full contact in the guide sleeve. The slurry enters the flotation chamber a of the flotation machine from the bottom of the guide sleeve, and is thrown around by the stirring paddle. The minerals in the flotation barrel 10 combine with the bubbles to rise to the overflow port and overflow from the overflow port. The foam product directly enters the centrifugal chamber b, and first reaches the guide ring 11, and then flows to the outer sleeve 20 through the guide ring 11. In this process, the defoaming device can spray defoaming agent to defoam and prevent the foam product from accumulating on the guide ring 11 and prevent the filter holes 21 from being blocked. The outer ring gear 22 is driven to rotate by the power motor 70, so that the outer sleeve 20 rotates to generate a centrifugal dewatering action. The dry coal slurry from which the water is removed is discharged from the clean coal outlet; and the centrifugal water enters the centrifugal water collection chamber c and is finally discharged from the centrifugal water outlet.

[0043] Since the minerals floated in the laboratory are not fixed, the types and compositions of the minerals often change, thereby causing the thickness of the froth layer in the flotation barrel 10 to change. When the thickness of the froth layer changes, simply relying on the conventional overflow to discharge the froth obviously has defects. Therefore, the present application adopts the way of scraping the froth product by the scraper 60 to assist the flotation barrel 10 to discharge the froth product. Therefore, through the friction adjustment, F≤f, that is, enough to drive the overflow ring 30 at the top of the flotation barrel 10 to rotate at a low speed relative to the body of the flotation barrel 10. The friction force changes constantly, so that the rotation speed changes adaptively. When the thickness of the froth layer increases, the friction force of one of the modules is appropriately increased or decreased, the overflow ring 30 at the top of the flotation barrel 10 rotates, and the scraper 60 also works to scrape the froth product, thereby increasing the discharge rate of the froth product of the device. When the thickness of the froth layer is within the normal range, the friction force of one of the modules is adjusted until F>f, at which time the scraper 60 does not need to work, and the froth product can be discharged by relying on the overflow.

[0044] Of course, when actually adjusting the friction force, the set screw 43 shown in Figure 2 , a wedge-shaped friction block, or even a sealing ring 44 with a different friction coefficient can be used to achieve the purpose. In addition, under the condition of F=f, it has been proved that the accuracy of the control process is relatively low, so such a situation can be avoided as much as possible.

[0045] So far, the laboratory flotation and dehydration all-in-one machine provided by the present application can organically combine the flotation process and the dehydration process, greatly simplifying the experimental process of mineral processing experiments; at the same time, it also avoids manual bubble scraping and reduces the time of manual operation. In addition, under the high efficiency of the centrifugal shear force cooperating with the scraper 60, the present application can realize rapid defoaming, and the effect is better with the spraying. The present application can cope with the change of the thickness of the foam layer caused by the change of the type and composition of the minerals, and is very convenient and flexible to use.

[0046] Of course, the present application is not limited to the details of the above-described exemplary embodiments, but also includes the same or similar structures that can be realized in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting from any point of view, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0047] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that those skilled in the art can understand.

[0048] The technologies, shapes, and structural parts not described in detail in the present application are well-known technologies.

Claims

1. A laboratory flotation dewatering all-in-one machine comprising a flotation tank (10) provided with a flotation function, characterized in that: The outer coaxial sleeve of the flotation barrel (10) is provided with an outer sleeve (20) driven by a power source, and the area between the outer sleeve (20) and the flotation barrel (10) constitutes a centrifugal chamber. The upper part of the centrifugal chamber constitutes a feed inlet for foam products at the overflow ring (30) position. The centrifugal water is filtered out through the filter hole (21) in the cylinder wall of the outer sleeve (20) and enters the centrifugal water outlet. The bottom of the centrifugal chamber is provided with a clean coal outlet. The barrel opening of the flotation barrel (10) is coaxially provided with an overflow ring (30), and the bottom surface of the overflow ring (30) forms a sealed inner guide rail module (40) with the barrel opening of the flotation barrel (10). The overflow ring (30) is provided with a scraper (60) for scraping foam. The upper part of the outer sleeve (20) and the outer wall of the overflow ring (30) and the lower part of the outer sleeve (20) and the outer wall of the flotation barrel (10) form a sealed outer guide rail module (50), and the friction force at the inner guide rail module (40) and / or the friction force at the outer guide rail module (50) can be adjusted.

2. The laboratory flotation dewatering all-in-one machine according to claim 1, characterized in that: The inner wall of the outer sleeve (20) is arranged with upper radial support rods (51) and lower radial support rods (52) extending radially inward. The outer wall of the overflow ring (30) is coaxially arranged with an annular upper groove body (53) corresponding to the height of the upper radial support rod (51). The outer wall of the flotation barrel (10) is coaxially arranged with an annular lower groove body (54) corresponding to the height of the lower radial support rod (52), and each groove body is a T-shaped groove. The inner extension ends of the upper radial support rod (51) and the lower radial support rod (52) are arranged with T-shaped inner clamping tenons. The inner clamping tenon of the upper radial support rod (51) is clamped into the groove cavity of the upper groove body (53) to form an upper guide rail assembly, and the upper guide rail assembly has a gap for the downward falling of ore pulp. The inner clamping tenon of the lower radial support rod (52) is clamped into the groove cavity of the lower groove body (54) to form a lower guide rail assembly, and the lower guide rail assembly has a space for the downward falling of clean coal.

3. A laboratory flotation dewatering all-in-one machine according to claim 1 or 2, characterized in that: The barrel opening of the flotation barrel (10) is coaxially provided with an opening upward docking ring groove (41), and the bottom surface of the overflow ring (30) is coaxially arranged with an opening downward matching ring groove (42) to make the groove cavity of the matching ring groove (42) clamped into the outer groove wall of the docking ring groove (41). A sealing ring (44) is arranged between the docking ring groove (41) and the matching ring groove (42).

4. The laboratory flotation dewatering all-in-one machine according to claim 3, characterized in that: The tight screw (43) radially penetrates the outer groove wall of the matching ring groove (42) and is tightly matched with the outer groove wall of the docking ring groove (41). By adjusting the tight screw (43) and the tight force of the outer groove wall of the matching ring groove (42), the friction force at the inner guide rail module (40) is adjusted.

5. The laboratory flotation dewatering all-in-one machine according to claim 3, characterized in that: The docking ring groove (41) is arranged with a wedge-shaped friction block. By adjusting the tight force of the wedge-shaped surface of the wedge-shaped friction block and the wedge-shaped matching surface at the matching ring groove (42), the friction force at the inner guide rail module (40) is adjusted.

6. The laboratory flotation dewatering all-in-one machine according to claim 3, characterized in that: The sealing ring (44) is located at the groove cavity bottom surface of the matching ring groove (42), and is a replaceable structure, so as to adjust the friction force at the inner guide rail module (40).

7. The laboratory flotation dewatering all-in-one machine according to claim 1 or 2, characterized in that: A guide ring (11) is coaxially arranged at the outer wall of the flotation barrel (10), the height of the guide ring (11) gradually decreases outwardly at the flotation barrel (10), and there is a gap between the guide ring (11) and the outer sleeve (20), so as to guide the foam product to the inner wall of the outer sleeve (20).

8. The laboratory flotation dewatering all-in-one machine according to claim 2, characterized in that: The outer sleeve (20) is coaxially sleeved with an outer box body (80), and the area between the outer box body (80) and the outer sleeve (20) constitutes a centrifugal water collecting cavity, and a centrifugal water outlet is arranged at the bottom of the centrifugal water collecting cavity; an outer tenon is arranged at the outer extension end of each radial support rod, and a T-shaped slot-shaped upper guide rail ring groove (55) and a lower guide rail ring groove (56) are arranged on the inner wall of the outer box body (80) corresponding to the height of each radial support rod, the outer tenon is clamped into the corresponding guide rail ring groove and forms a guide rail cooperation; the outer tenon and each guide rail ring groove matched therebetween, and the inner tenon and each groove body matched therebetween jointly constitute the outer guide rail module (50).

9. A laboratory flotation dewatering all-in-one machine according to claim 8, characterized in that: A motor chamber is arranged at the centrifugal water collecting cavity, and a power motor (70) constituting the power source is arranged in the motor chamber, an outer gear ring (22) is coaxially arranged at the outer wall of the outer sleeve (20), and the power motor (70) is engaged with the outer gear ring (22) through gear transmission.

10. A flotation dewatering method using a laboratory flotation dewatering all-in-one machine according to claim 1 or 2, characterized in that: The friction force of the outer guide rail module (50) is f, the friction force of the inner guide rail module (40) is F; a foam layer thickness threshold A is set, if the current foam layer thickness is less than A, F>f, at this time the scraper (60) does not work; if the current foam layer thickness is greater than or equal to A, F≤f, at this time the overflow ring (30) generates rotary motion relative to the flotation barrel (10), The scraper (60) fixed on the overflow ring (30) works accordingly; under the premise of F≤f, F is adjusted, So as to control the foam scraping speed of the scraper (60) and realize the adjustment of the foam product discharge rate. ​

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