Equipment for removing metal impurities from waste plastic film of emulsion explosive

Abstract

The present invention provides a metal impurity removal device for waste plastic film of emulsion explosives, belonging to the technical field of civil explosives. It solves the problem that the existing method for removing metal substances in the production process of explosives does not have full automation capabilities. The device includes a bracket and two groups of feed wheels, two groups of metal removal wheels, and two groups of discharge wheels that are rotated from top to bottom on the bracket in sequence. The waste plastic film is first fed into the metal removal wheels from top to bottom through the feed wheels to complete the removal of metal substances on the surfaces of both sides and then fed out by the discharge wheels. The feed wheels and / or the discharge wheels are provided with a driving device for driving them to rotate. The metal removal wheels are provided with magnetic adsorbents. The adsorbents on the two metal removal wheels respectively adsorb the metal substances on both sides of the waste plastic film passing therebetween. Compared with the prior art, the device can efficiently and stably adsorb the metal substances adhered to both sides of the waste plastic film, and realizes the function of automatically removing metal impurities.

Description

Technical Field

[0001] The invention belongs to the technical field of civil explosives and relates to a device for removing metal impurities from waste plastic films of emulsion explosives. Background Art

[0002] Emulsion explosives are a new type of industrial explosive developed in the 1970s. They are formed by using emulsifiers to evenly disperse droplets of oxidant salt aqueous solution in an oil-phase continuous medium containing porous substances such as dispersed bubbles or hollow glass microspheres. Emulsion explosives have many advantages such as high density, high detonation velocity, high intensity, good water resistance, small critical diameter, and good detonation sensitivity. Therefore, they are widely used in various civil blasting work, and their superiority is more evident in water and humid blasting occasions.

[0003] In the production process of emulsion explosives, the destruction and treatment method of rolled composite film and middle package composite film is an important part. Green and environmentally friendly waste treatment has always been the demand of industrial development. Regarding the treatment of waste plastic film, the applicant's subsidiary filed an invention patent application on April 15, 2022 with the theme of "A system and process for treating waste plastic film of industrial explosives" (publication number: CN114750332A, hereinafter referred to as the existing application). After further in-depth research, the applicant found that the existing application still has the problem of poor removal of metal substances.

[0004] The existing equipment requires the metal detector to automatically stop and alarm after completing the detection, and then manually detect the metal. In the complete assembly line system, if the operation that requires manual assistance is added, the entire assembly line cannot be fully automated. Therefore, it is necessary to further design the process of removing metal substances from waste plastic film in explosive production so that it can have complete automation functions. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that the existing method for removing metal substances in the production process of explosives does not have full automation capability, and to propose a device for removing metal impurities from waste plastic film of emulsion explosives.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] A metal impurity removal device for waste plastic film of emulsion explosives, characterized in that it comprises a bracket and two groups of feed wheels, two groups of metal removal wheels and two groups of discharge wheels which are arranged on the bracket in rotation from top to bottom in sequence. The waste plastic film is first fed into the metal removal wheels from top to bottom through the feed wheels to complete the removal of metal substances on the surfaces of both sides and then fed out by the discharge wheels. The feed wheels and / or the discharge wheels are provided with a driving device for driving them to rotate. The driving device causes the two feed wheels and / or the two discharge wheels to form a relative reverse motion with respect to each other, and after the two feed wheels and / or the two discharge wheels rotate, a friction force pulling downwards is generated on the waste plastic film passing between them. The metal removal wheels are provided with magnetic adsorbents, and the adsorbents on the two metal removal wheels respectively adsorb metal substances on both sides of the waste plastic film passing therebetween.

[0008] In the above-mentioned metal impurity removal equipment for waste plastic film of emulsion explosive, the metal removal wheel is made of insulating material and is hollow inside. The outer ring of the metal removal wheel is evenly arrayed with a number of extension plates made of insulating material. The adsorbent has multiple and respectively arranged at the ends of the extension plates. The two groups of metal removal wheels realize relative reverse rotation through the above-mentioned driving device. During the rotation of the metal removal wheel, each adsorbent will periodically approach and or move away from the waste plastic film. An automatic opening and closing component is also provided on the plastic film bracket. Under the action of the automatic opening and closing component: when the adsorbent is close to the waste plastic film for a period of time, the adsorbent can adsorb the metal substance on the waste plastic film, and when the adsorbent is away from the waste plastic film for a period of time, the adsorbent is ineffective to make the metal substance on the adsorbent fall off.

[0009] In the above-mentioned metal impurity removal equipment for waste plastic film of emulsion explosives, the adsorbent is an electromagnet, and each extension plate and electromagnet is provided with an independent power supply component, the power supply component includes a battery built into the extension plate or the electromagnet and a conductive wire for connecting the electromagnet and the battery in series in the same circuit, one end of the conductive wire is disconnected and two conductive contacts are extended, the two conductive contacts are led out from the side of the metal removal wheel and the straight line where the two conductive contacts are located passes through the central axis of the metal removal wheel, the two conductive contacts form a first circle and a second circle in sequence as the metal removal wheel rotates, the automatic opening and closing component includes an insulating disk fixedly mounted on a bracket, the insulating disk is coaxially arranged with the metal removal wheel, a plurality of groups of power adjustment components are circumferentially distributed on the insulating disk, the side where the power adjustment components of the insulating disk are located is attached to the side where the conductive contacts of the metal removal wheel extend, and the power adjustment component includes an inner arc-shaped non-resistance conductive sheet, an outer arc-shaped The unobstructed conductive sheet and the resistor element connected between the inner arc-shaped unobstructed conductive sheet and the outer arc-shaped unobstructed conductive sheet through wiring, the inner arc-shaped unobstructed conductive sheet in all power regulating components is on the first circle, the outer arc-shaped unobstructed conductive sheet in all power regulating components is on the second circle, there are small gaps between adjacent inner arc-shaped unobstructed conductive sheets and adjacent outer arc-shaped unobstructed conductive sheets, as the metal wheel rotates, the two conductive contacts in each power supply component will gradually and periodically contact the inner arc-shaped unobstructed conductive sheet and the outer arc-shaped unobstructed conductive sheet in each power regulating component to make the electromagnet produce an electromagnetic adsorption effect, or when the two conductive contacts rotate to not contact any power regulating component, the adsorbent is in a deactivated state and can make the metal material on the electromagnet fall off, the resistance values ​​of the resistor elements in different power regulating components are different, and the resistance value of the resistor element closer to the path through which the waste plastic film passes is larger.

[0010] In the above-mentioned metal impurity removal equipment for waste plastic film of emulsion explosive, an elastic member is provided between the conductive contact and the end surface of the metal removal wheel, and the elastic member enables the conductive contact to fit tightly with the power adjustment component when it contacts the power adjustment component.

[0011] In the above-mentioned equipment for removing metal impurities from waste plastic film of emulsion explosives, the driving device includes a driving motor fixedly mounted on a bracket and a driving gear fixedly mounted on the rotating shaft of a feed wheel or a discharge wheel, the two driving gears are meshed with each other, and the driving motor is used to drive one of the driving gears to rotate.

[0012] In the above-mentioned metal impurity removal equipment for waste plastic film of emulsion explosive, pulleys are fixedly sleeved on the rotating shafts of the feed wheel, the discharge wheel and the metal removal wheel, and a transmission belt is tightly sleeved on the pulleys on the feed wheel, the discharge wheel and the metal removal wheel on one side.

[0013] In the above-mentioned equipment for removing metal impurities from waste plastic film of emulsion explosive, the bracket is also provided with a receiving box for receiving metal substances dropped from the adsorbent.

[0014] Compared with the prior art, the metal impurity removal equipment can efficiently and stably adsorb the metal substances adhered to both sides of the waste plastic film, thereby realizing the function of automatically removing metal impurities. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the metal impurity removal equipment after the hidden bracket;

[0016] Figure 2 It is a schematic diagram of the positional relationship of the feed wheel, the metal removal wheel, and the discharge wheel;

[0017] Figure 3 It is a schematic diagram of the structure of the feed wheel, the metal removal wheel and the discharge wheel from a side perspective;

[0018] Figure 4 It is a schematic diagram of the structure of the metal wheel and the automatic opening and closing component in a side perspective;

[0019] Figure 5 It is a schematic diagram of the structure of the insulating disk;

[0020] Figure 6 It is a schematic diagram of the structure of the metal removal wheel;

[0021] In the figure, 1. feed wheel; 2. discharge wheel; 3. metal removal wheel; 4. adsorbent; 5. extension plate; 6. conductive contact; 7. insulating disk; 8. inner arc-shaped non-resistance conductive sheet; 9. outer arc-shaped non-resistance conductive sheet; 10. resistor; 11. drive motor; 12. drive gear; 13. pulley; 14. transmission belt; 15. receiving box. DETAILED DESCRIPTION

[0022] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0023] like Figure 1 As shown, the metal impurity removal equipment for waste plastic film of emulsion explosives includes a bracket and two groups of feed wheels 1, two groups of metal removal wheels 3, and two groups of discharging wheels 2 which are rotated on the bracket from top to bottom in sequence. The waste plastic film is first fed into the metal removal wheel 3 through the feed wheel 1 from top to bottom to complete the removal of metal substances on the surfaces of both sides and then fed out by the discharging wheel 2. The feed wheel 1 and / or the discharging wheel 2 are provided with a driving device for driving them to rotate. The driving device enables the two feed wheels 1 and / or the two discharging wheels 2 to form a relative reverse motion with respect to each other, and after the two feed wheels 1 and / or the two discharging wheels 2 rotate, a friction force pulling downward on the waste plastic film passing therebetween is generated. The metal removal wheel 3 is provided with a magnetic adsorbent 4, and the adsorbents 4 on the two metal removal wheels 3 respectively adsorb the metal substances on both sides of the waste plastic film passing therebetween.

[0024] Because metal impurities may adhere to both sides of the waste plastic film, if the magnetic attraction principle is to be used to achieve the metal removal function, the waste plastic film cannot be adsorbed from only one side. For example, directly setting a magnet above the conveyor belt in the existing application is definitely not advisable, which will cause the magnet on the back of the waste plastic film and the waste plastic film itself to be adsorbed.

[0025] Therefore, the present invention adopts the above basic design concept and adds an extra descending process to the waste plastic film. The waste plastic film passes through the middle of two groups of feed wheels 1 and two groups of discharge wheels 2. During the passage, the metal removal wheels 3 on both sides remove metal impurities through the metal adsorption function of the adsorbent 4.

[0026] The above is a basic solution, but after the adsorbent 4 adsorbs the metal impurities, the metal impurities must still be allowed to fall off in time, otherwise the metal impurities will accumulate on the adsorbent 4 more and more, so the present application provides the following preferred solution.

[0027] like Figure 1 and Figure 2 As shown, the metal removal wheel 3 is made of insulating material and is hollow inside. The outer ring of the metal removal wheel 3 is evenly distributed with a number of extension plates 5 made of insulating material. The adsorbent 4 has multiple adsorbents 4 and is respectively arranged at the ends of the extension plates 5. The two groups of metal removal wheels 3 can achieve relative reverse rotation through the above-mentioned driving device. During the rotation of the metal removal wheel 3, each adsorbent 4 will periodically approach and or move away from the waste plastic film. An automatic opening and closing component is also provided on the bracket. Under the action of the automatic opening and closing component: when the adsorbent 4 is close to the waste plastic film for a period of time, the adsorbent 4 can adsorb the metal substance on the waste plastic film, and when the adsorbent 4 is away from the waste plastic film for a period of time, the adsorbent 4 is ineffective to make the metal substance on the adsorbent 4 fall off.

[0028] By using the extension plate 5 to disperse multiple adsorbents 4 at longer intervals, and then allowing the adsorbents 4 to rotate along with the metal wheel 3, there will be two situations where the adsorbents 4 are close to the waste plastic film and far away from the waste plastic film. Then, for these two situations, when the adsorbents 4 are close to the waste plastic film, they have suction to adsorb the metal, and when the adsorbents 4 are far away from the waste plastic film, they lose their suction function and the metal on the adsorbents 4 falls off. Therefore, the adsorbents 4 will promptly discharge the adsorbed metal after each cycle.

[0029] Next, an important problem of the present invention is to be solved, which is mainly the problem of suction force.

[0030] In the above-mentioned technical means, the specific suction force of each adsorbent 4 is not specified, but it is very undesirable to control the suction force of all adsorbents 4 to the same equivalent.

[0031] As is well known, the magnitude of magnetic force is related to the distance between two objects, so multiple adsorbents 4 at different positions will generate suction with metal impurities somewhere on the waste plastic film. Because there are multiple adsorbents 4, adsorption will be generated at multiple locations along the path through which the waste plastic film passes. If the magnetic forces of the adsorbents 4 are the same, there will be an extreme position of adsorption efficiency and a weak position of adsorption efficiency on this path. The suction magnitudes at the extreme position and the weak position are very different. Metallic materials will definitely tend to move toward the extreme position with greater suction, because the irregular shape of metallic materials is likely to have edges and corners, and the waste plastic film is a plastic product itself and the strength and toughness are not high. The metallic materials will easily scratch the waste plastic film during the process of being moved.

[0032] Therefore, this is not advisable for the design concept of impurity removal on the same path. The best way is to make the magnetic attraction of the metal material at each position on the entire path obtain a relatively balanced value, so that the difference between the suction force at the extreme position and the suction force at the weak position can be minimized to maintain a stable adsorption efficiency.

[0033] Therefore, the applicant particularly provides the following technical solution.

[0034] like Figure 6 As shown, the adsorbent 4 is an electromagnet, and each extension plate 5 and the electromagnet are provided with an independent power supply component, which includes a battery built into the extension plate 5 or the electromagnet and a conductive wire for connecting the electromagnet and the battery in series in the same circuit. One end of the conductive wire is disconnected and two conductive contacts 6 are extended. The two conductive contacts 6 are led out from the side of the metal removal wheel 3 and the straight line where the two conductive contacts 6 are located passes through the central axis of the metal removal wheel 3. The two conductive contacts 6 form a first circle and a second circle in sequence as the metal removal wheel 3 rotates.

[0035] Through the above design, the electromagnet will be magnetic only when the conductive contact 6 is connected, so the situation when the conductive contact 6 is not connected can be realized at the same time. When the conductive contact 6 is not connected, the metal on the electromagnet is dropped.

[0036] like Figures 2 to 6As shown, the automatic opening and closing assembly includes an insulating disk 7 fixedly mounted on a bracket, the insulating disk 7 is coaxially arranged with the metal removal wheel 3, and a plurality of groups of power adjustment components are circumferentially distributed on the insulating disk 7, and the side where the power adjustment components of the insulating disk 7 are located is attached to the side where the conductive contact 6 of the metal removal wheel 3 extends, and the power adjustment components include an inner arc-shaped non-impeding conductive sheet 8, an outer arc-shaped non-impeding conductive sheet 9, and a resistor 10 connected between the inner arc-shaped non-impeding conductive sheet 8 and the outer arc-shaped non-impeding conductive sheet 9 through wiring, the inner arc-shaped non-impeding conductive sheet 8 of all the power adjustment components is on the first circle, and the outer arc-shaped non-impeding conductive sheet 9 of all the power adjustment components is on the second circle, and the power adjustment components are arranged on the second circle. There are small gaps between adjacent inner arc-shaped unobstructed conductive sheets 8 and adjacent outer arc-shaped unobstructed conductive sheets 9. As the metal wheel 3 rotates, the two conductive contacts 6 in each power supply component will gradually and periodically contact the inner arc-shaped unobstructed conductive sheets 8 and the outer arc-shaped unobstructed conductive sheets 9 in each power adjustment component to make the electromagnet produce an electromagnetic adsorption effect, or when the two conductive contacts 6 rotate to no longer contact any power adjustment component, the adsorbent 4 is in a deactivated state, which can cause the metal material on the electromagnet to fall off. The resistance values ​​of the resistors 10 in different power adjustment components are different, and the closer the resistor 10 is to the path through which the waste plastic film passes, the greater the resistance value.

[0037] like Figures 4 to 6 As shown, it can be seen that, except for the metal wheel 3, there is always a conductive contact 6 in contact with these power regulating components. When the conductive contact 6 is in contact with the inner arc-shaped unobstructed conductive sheet 8 and the outer arc-shaped unobstructed conductive sheet 9 in a power regulating component, the inner arc-shaped unobstructed conductive sheet 8 and the outer arc-shaped unobstructed conductive sheet 9 and the resistor 10 therebetween act as wires, so that the power supply component is turned on, and the electromagnet on the power supply component will generate magnetism.

[0038] As the metal removal wheel 3 continues to rotate, the conductive contact 6 will be separated from the previous power regulating component and connected to the next power regulating component, which is equivalent to changing a wire.

[0039] Because the resistance value of the resistor element 10 in each power regulating component is different, it is equivalent to the resistance value of the wire being different.

[0040] According to the power calculation formula of the series circuit: Assume that the voltage provided by the battery is U, the resistance of the electromagnet itself is R1, the resistance of the resistor 10 is R2, the power of the electromagnet is P1, the voltage across the electromagnet is U1, and the current of the circuit where the electromagnet is located is I, then:

[0041] I=U / (R1+R2)

[0042] U1=I·R1=U·R1 / (R1+R2)

[0043] The power of the electromagnet is P1 = U1·I = U2·R1 / (R1+R2)2

[0044] According to the formula, when U and R1 are fixed values, the larger R2 is, the smaller P1 is, the smaller the power of the electromagnet is, and the smaller the magnetism is.

[0045] Since the resistance value of the resistor 10 is larger when it is closer to the path where the waste plastic film passes, it can be understood that the magnetism of the electromagnet is smaller when it is closer to the waste plastic film, but the distance is also closer, and the magnetism of the electromagnet is larger when it is farther away from the waste plastic film, but the distance is farther. The magnetic force at different positions on the entire path can be relatively stable by using the method of small magnetism but short distance and large magnetism but long distance. In other words, the extreme value difference between the peak and the trough is small, and a relatively stable magnetic attraction is provided in the entire area used to adsorb metal substances.

[0046] An elastic member is provided between the conductive contact 6 and the end surface of the metal removal wheel 3, and the elastic member enables the conductive contact 6 to fit tightly with the power regulating component when it contacts the power regulating component.

[0047] The driving device includes a driving motor 11 fixedly mounted on a bracket and a driving gear 12 fixedly mounted on the rotating shaft of the feed wheel 1 or the discharge wheel 2. The two driving gears 12 are meshed with each other, and the driving motor 11 is used to drive one of the driving gears 12 to rotate.

[0048] A belt pulley 13 is fixedly sleeved on the rotating shafts of the feed wheel 1, the discharge wheel 2 and the metal removal wheel 3, and a transmission belt 14 is tightly sleeved on the belt pulley 13 on the feed wheel 1, the discharge wheel 2 and the metal removal wheel 3 on one side.

[0049] The bracket is also provided with a receiving box 15 for receiving the metal materials dropped from the adsorber 4 .

[0050] It should be understood that in the claims and description of the present invention, all "including..." should be understood as an open-ended meaning, that is, its meaning is equivalent to "at least contains...", and should not be understood as a closed meaning, that is, its meaning should not be understood as "only includes...".

[0051] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A device for removing metal impurities from waste plastic film of emulsion explosive, characterized in that: The invention comprises a support and two groups of feed wheels (1), two groups of metal removal wheels (3) and two groups of discharge wheels (2) which are arranged on the support and rotated in sequence from top to bottom. The waste plastic film is first fed into the metal removal wheels (3) from top to bottom to remove the metal substances on the surfaces of both sides and then discharged by the discharge wheels (2). The feed wheels (1) and / or the discharge wheels (2) are provided with a driving device for driving them to rotate. The driving device causes the two feed wheels (1) and / or the two discharge wheels (2) to form a relative reverse motion with respect to each other. After the two feed wheels (1) and / or the two discharge wheels (2) rotate, a friction force is generated to pull the waste plastic film passing between them downward. The metal removal wheels (3) are provided with a magnetic adsorbent (4). The adsorbents (4) on the two metal removal wheels (3) respectively absorb the waste plastic film passing between them. The metal substances on both sides of the plastic film are adsorbed; the metal removal wheel (3) is made of insulating material and is hollow inside; a plurality of extension plates (5) made of insulating material are evenly distributed in an array on the outer ring of the metal removal wheel (3); the adsorbent (4) has a plurality of adsorbents and is respectively arranged at the ends of the extension plates (5); the two groups of metal removal wheels (3) are relatively rotated in opposite directions by the above-mentioned driving device; during the rotation of the metal removal wheel (3), each adsorbent (4) will periodically approach and / or move away from the waste plastic film; an automatic opening and closing component is also provided on the bracket; under the action of the automatic opening and closing component: when the adsorbent (4) is close to the waste plastic film for a period of time, the adsorbent (4) can adsorb the metal substances on the waste plastic film; and when the adsorbent (4) is away from the waste plastic film for a period of time, the adsorbent (4) is ineffective so that the metal substances on the adsorbent (4) fall off;The adsorbent (4) is an electromagnet. Each extension plate (5) and the electromagnet is provided with an independent power supply component. The power supply component includes a battery built into the extension plate (5) or the electromagnet and a conductive wire for connecting the electromagnet and the battery in series in the same circuit. One end of the conductive wire is disconnected and two conductive contacts (6) are extended. The two conductive contacts (6) are led out from the side of the metal removal wheel (3) and the straight line where the two conductive contacts (6) are located passes through the central axis of the metal removal wheel (3). The two conductive contacts (6) form a first circle and a second circle in sequence as the metal removal wheel (3) rotates. The automatic opening and closing component includes an insulating disk (7) fixedly arranged on a bracket. The insulating disk (7) is coaxially arranged with the metal removal wheel (3). A plurality of power adjustment components are distributed on the circumference of the insulating disk (7). The side where the power adjustment components of the insulating disk (7) are located is attached to the side where the conductive contacts (6) of the metal removal wheel (3) extend. The power adjustment components include an inner arc-shaped non-blocking conductive sheet (8), an outer arc-shaped non-blocking conductive sheet (9) and The resistor (10) is connected between the inner arc-shaped non-blocking conductive sheet (8) and the outer arc-shaped non-blocking conductive sheet (9) by wiring, the inner arc-shaped non-blocking conductive sheets (8) in all power adjustment components are on the first circle, the outer arc-shaped non-blocking conductive sheets (9) in all power adjustment components are on the second circle, and there are small gaps between adjacent inner arc-shaped non-blocking conductive sheets (8) and adjacent outer arc-shaped non-blocking conductive sheets (9). As the metal wheel (3) rotates, the two conductive contacts (6) in each power supply component will gradually and periodically contact the inner arc-shaped non-blocking conductive sheet (8) and the outer arc-shaped non-blocking conductive sheet (9) in each power adjustment component to produce an electromagnetic adsorption effect, or when the two conductive contacts (6) rotate to not contact any power adjustment component, the adsorption body (4) is in a deactivated state and can cause the metal material on the electromagnet to fall off. The resistance values ​​of the resistors (10) in different power adjustment components are different, and the resistance value of the resistor (10) closer to the path where the waste plastic film passes is larger. ; 2. The metal impurity removal device for waste plastic film of emulsion explosive according to claim 1, characterized in that: An elastic member is provided between the conductive contact (6) and the end surface of the metal removal wheel (3), and the elastic member enables the conductive contact (6) to fit tightly with the power adjustment component when it contacts the power adjustment component.

3. The metal impurity removal device for waste plastic film of emulsion explosive according to claim 1 or 2, characterized in that: The driving device comprises a driving motor (11) fixedly mounted on a bracket and a driving gear (12) fixedly sleeved on a rotating shaft of a feed wheel (1) or a discharge wheel (2), the two driving gears (12) being meshed with each other, and the driving motor (11) is used to drive one of the driving gears (12) to rotate.

4. The metal impurity removal device for waste plastic film of emulsion explosive according to claim 1 or 2, characterized in that: The rotating shafts of the feed wheel (1), the discharge wheel (2) and the metal removal wheel (3) are all fixedly sleeved with pulleys (13), and the pulleys (13) on the feed wheel (1), the discharge wheel (2) and the metal removal wheel (3) on the same side are tightly sleeved with a transmission belt (14).

5. The metal impurity removal device for waste plastic film of emulsion explosive according to claim 1 or 2, characterized in that: The support is also provided with a receiving box (15) for receiving metal materials dropped from the adsorbent (4).

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