Separation device for granular carbon in tailings

Abstract

The utility model belongs to the technical field of tailings detection, and particularly relates to a separation device for particulate carbon in tailings, which comprises a base, a thermostatic oscillator; the liquid collecting pipe is arranged in the mounting hole of the constant-temperature oscillator; a sample sieve is mounted at the bottom of the lifting head through a mounting head; the lifting mechanism is used for driving the lifting head and the sample sieve at the bottom to reciprocate along the vertical direction; the liquid supply mechanism is used for conveying a sodium hexametaphosphate aqueous solution or a deionized aqueous solution to each sample sieve; and the controller is used for controlling the constant-temperature oscillator, the lifting mechanism and the liquid supply mechanism. According to the separation device for the particulate carbon in the tailings, the particulate carbon in the tailings can be effectively separated, operation is easy and convenient, the separation efficiency is high, and the separation device is suitable for actual production and application.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of tailings detection, and particularly relates to a separation device for particulate carbon in tailings. BACKGROUND

[0002] In the field of mining, tailings, as by-products generated in the process of ore processing, are usually stored in tailings ponds, forming a large amount of solid waste. The particulate carbon contained in the tailings may be derived from natural carbonaceous minerals in the ore or from carbon-based materials added in the processing link. Such particulate carbon may migrate or be released under the influence of environmental conditions such as immersion water and wind erosion in the tailings pond, and may cause certain environmental changes in the mining area and its surrounding areas. Therefore, it is of great significance to determine the source, content and behavior characteristics of particulate carbon in tailings for assessing the environmental risks in the operation process of tailings ponds and formulating corresponding management measures.

[0003] Existing particulate carbon determination techniques mainly include high-temperature combustion method, chemical titration method and spectral analysis method. Although the above methods have high determination accuracy under laboratory conditions, there are still limitations in practical application. On the one hand, high-temperature combustion and chemical titration generally require complex sample pretreatment and long detection period, and have large reagent usage and complicated operation steps, which make it difficult to be used for routine monitoring of tailings ponds. On the other hand, such methods usually rely on large-scale instruments and equipment, which are high in cost and require operators to have professional training background, which is not conducive to popularization in the field of mining.

[0004] In recent years, spectral and chromatographic methods have also been tried to be applied to the detection of carbon content in tailings, but the determination results are easily affected by factors such as mineral matrix, moisture content and environmental conditions, and the sensitivity and stability are difficult to guarantee. In addition, such instruments require high maintenance and have high purchase cost, which is poor in economy for daily monitoring in mining areas. Therefore, it is urgent to develop a particulate carbon analysis device that can adapt to field conditions, has low cost and is easy to operate, so as to realize rapid, stable and accurate detection of particulate carbon in tailings, thereby improving the efficiency and reliability of tailings pond environmental monitoring. CONTENT OF THE UTILITY MODEL

[0005] In order to solve at least one technical problem existing in the prior art, the application provides a separation device for particulate carbon in tailings.

[0006] The application discloses a separation device for particulate carbon in tailings, which comprises:

[0007] a base;

[0008] a constant-temperature oscillator fixedly arranged on the top surface of the base and capable of reciprocating horizontally on the base, and the top surface of the constant-temperature oscillator is uniformly provided with a plurality of mounting holes;

[0009] a number of collecting pipes, each of which is arranged in one of the mounting holes with an opening facing upward;

[0010] a lifting head, the bottom of which is provided with a number of mounting heads matched with the number and positions of the collecting pipes, each of which has a first liquid inlet at the top, a first liquid outlet at the bottom, and a liquid flow channel connecting the first liquid inlet and the first liquid outlet;

[0011] a number of sample screens, each of which is arranged at the bottom of one of the mounting heads, and the outer contour shape of each of the sample screens is similar to the inner cavity shape of the collecting pipes, and the outer contour size of each of the sample screens is smaller than the inner cavity size of the collecting pipes;

[0012] a lifting mechanism, which is used to suspend the lifting head at the top of the thermostat shaker, and can drive the lifting head, the mounting heads at the bottom of the lifting head, and the sample screens to make reciprocating motion in the vertical direction, so that the sample screens can be completely inserted into the inner cavities of the collecting pipes or completely separated from the inner cavities of the collecting pipes;

[0013] a liquid supply mechanism, which is connected to the first liquid inlet of each of the mounting heads, and is used to respectively supply sodium hexametaphosphate aqueous solution or deionized water solution to each of the sample screens through the first liquid inlet;

[0014] a controller, which is arranged on the base, and is used to control the thermostat shaker, the lifting mechanism, and the liquid supply mechanism.

[0015] According to at least one embodiment of the present application, the lifting head is internally formed with a liquid storage cavity, and the top and the bottom of the lifting head are respectively provided with a second liquid inlet and a second liquid outlet which are in communication with the liquid storage cavity, wherein the second liquid inlet is in communication with the liquid supply mechanism, and the number of the second liquid outlets is the same as the number of the mounting heads, and each of the second liquid outlets is in communication with the first liquid inlet of one of the mounting heads.

[0016] According to at least one embodiment of the present application, the lifting mechanism comprises:

[0017] two vertical support plates which extend from opposite sides of the base toward the top; and

[0018] a horizontal support plate which is fixed between the two vertical support plates in the horizontal direction; and

[0019] a telescopic rod which is fixedly arranged at the bottom of the horizontal support plate, wherein the bottom of the telescopic rod is fixedly connected with the lifting head, and is used to drive the lifting head and the components at the bottom of the lifting head to make reciprocating motion in the vertical direction.

[0020] According to at least one embodiment of the present application, a mounting hole is arranged at the center of the lifting head, and a sleeve is arranged in the mounting hole, and the lifting head is sleeved on the rod body at the bottom of the telescopic rod through the sleeve.

[0021] According to at least one embodiment of the present application, a columnar limiting boss is arranged at the center of the top of the constant temperature oscillator, and a corresponding columnar anti-collision gasket is arranged at the bottom end of the lifting head.

[0022] According to at least one embodiment of the present application, the liquid supply mechanism comprises:

[0023] A first liquid storage tank and a second liquid storage tank are arranged in the base in a relatively independent manner, wherein the two liquid storage tanks are respectively used for storing sodium hexametaphosphate aqueous solution and deionized water solution; and

[0024] A first liquid supply pipeline extends from the first liquid storage tank and extends along the inside of one of the vertical support plates to the horizontal support plate, and the outlet of the first liquid supply pipeline is in communication with the second liquid inlet of the lifting head after penetrating through the horizontal support plate; and

[0025] A second liquid supply pipeline extends from the second liquid storage tank and extends along the inside of the other vertical support plate to the horizontal support plate, and the outlet of the second liquid supply pipeline is in communication with the second liquid inlet of the lifting head after penetrating through the horizontal support plate; and

[0026] A first liquid supply pump and a second liquid supply pump are respectively arranged in the first liquid storage tank and the second liquid storage tank.

[0027] According to at least one embodiment of the present application, the liquid supply mechanism further comprises:

[0028] A first check valve and a second check valve are respectively arranged on the first liquid supply pipeline and the second liquid supply pipeline.

[0029] According to at least one embodiment of the present application, the number of second liquid inlets at the top of the lifting head is the same as the number of mounting heads;

[0030] In addition, a flow divider is arranged on the bottom surface of the horizontal support plate and extends downward, the telescopic rod is fixed at the bottom of the flow divider, and the flow divider has a flow chamber in the inside, a third liquid inlet at the top, and the same number of third liquid outlets as the second liquid inlets at the bottom, and each third liquid outlet is in communication with one second liquid inlet through a hose.

[0031] According to at least one embodiment of the present application, the mounting head is threadedly connected with the sample screen.

[0032] According to at least one embodiment of the present application, the bottom of the base is provided with a non-slip pad.

[0033] The present application has at least the following beneficial technical effects:

[0034] The device for separating particulate carbon in tailings of the present application realizes efficient resolution of particulate carbon in tailings by integrating a constant-temperature oscillator and an automated lifting support; the constant-temperature oscillator fully mixes the sample under constant temperature and oscillation conditions, promotes the separation of particulate carbon, and can accurately control the up-and-down movement of the sample screen, complete the screening operation in mutual alignment with the liquid collecting pipe, effectively reduces the sample pretreatment link, avoids tedious manual operation steps, greatly improves the separation precision and separation efficiency, and reduces the operation difficulty and dependence on personnel professional skills, significantly improving the use convenience of the device. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 is the overall structure front view of the device for separating particulate carbon in tailings of the present application when the lifting mechanism is in the retracted state;

[0036] Figure 2 is the overall structure front view of the device for separating particulate carbon in tailings of the present application when the lifting mechanism is in the retracted state, the liquid collecting pipe is not shown, and the constant-temperature oscillator is not in the cross-sectional view state;

[0037] Figure 3 is the overall structure front view of the device for separating particulate carbon in tailings of the present application when the lifting mechanism is in the extended state;

[0038] Figure 4 is the front cross-sectional view of the device for separating particulate carbon in tailings of the present application in the state; Figure 1

[0039] Figure 5 is the front cross-sectional view of the device for separating particulate carbon in tailings of the present application in the state; Figure 1

[0040] Figure 6 is the side cross-sectional view of the device for separating particulate carbon in tailings of the present application in the state; Figure 1

[0041] Figure 7 is the overall structure cross-sectional view of the device for separating particulate carbon in tailings of the present application after the liquid collecting pipe is connected with the sample screen. DETAILED DESCRIPTION

[0042] ​​​For the purposes of making the technical solutions, purposes, and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the embodiments of the present application.

[0043] It needs to be understood that the technical terms possibly involved in the description of the present application, such as "top surface", "horizontal", "upward", "top", "bottom", "interior", "vertical", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the scope of protection of the present application.

[0044] The technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the embodiments of the present application. Figures 1-7 The device for separating particulate carbon in tailings of the present application will be described in further detail.

[0045] The present application discloses a device for separating particulate carbon in tailings, which can include a base 1, a constant-temperature oscillator 2, a liquid collecting pipe 8, a lifting head 4, a mounting head 5, a sample sieve 9, a lifting mechanism, a liquid supply mechanism, and a controller 19.

[0046] The base 1 can be made of various suitable shapes and materials, in the present embodiment, the base is preferably made of 316 stainless steel or other corrosion-resistant materials, with a size of 1.5 meters x 1 meter, and an anti-slip pad is provided at the bottom to ensure stable placement of the device.

[0047] The constant-temperature oscillator 2 can be any of various suitable constant-temperature oscillators known at present, which is fixedly arranged on the top surface of the base 1, preferably at the center, and can move horizontally on the base 1, while having the functions of adjustable speed and amplitude. In addition, a plurality of mounting holes are uniformly provided on the top surface of the constant-temperature oscillator 2.

[0048] Similarly, the liquid collecting pipe 8 can be made of various suitable materials, in the present embodiment, the liquid collecting pipe 8 is preferably made of transparent corrosion-resistant polypropylene material, with a diameter of 10 centimeters and a length of 50 centimeters, and each liquid collecting pipe 2 is provided with a sealing cover (which can be removed when in use); in addition, the number of liquid collecting pipes 8 is the same as the number of mounting holes on the constant-temperature oscillator 2, and each liquid collecting pipe 8 is fixedly arranged in a mounting hole with the opening facing upward.

[0049] The lifting head 4 is provided at the bottom with a plurality of mounting heads 5 adapted to the number and position of the liquid collecting pipes 8, each mounting head 5 has a first liquid inlet at the top, a first liquid outlet at the bottom, and a liquid flow channel connecting the first liquid inlet and the first liquid outlet.

[0050] The sample screen 9 is used for placing the sample to be separated, which can also be made of various suitable materials. In this embodiment, it is preferably made of corrosion-resistant nylon material, and its size is 30 cm x 30 cm. In addition, the number of sample screens 9 is the same as that of mounting heads 5, and each sample screen 9 is detachably fixed (preferably threaded) at the bottom of one mounting head 5. Further, to ensure that the liquid collecting pipe 8 does not touch the sample screen 9 when the constant temperature oscillator 2 is horizontally oscillated, the outer contour shape of the sample screen 9 is preferably similar to the inner cavity shape of the liquid collecting pipe 8, but the outer contour size is smaller than the inner cavity size of the liquid collecting pipe 8.

[0051] The lifting mechanism is used to suspend the lifting head 4 at the top of the constant temperature oscillator 2, and can drive the lifting head 4, the mounting head 5 at the bottom of the lifting head 4, and the sample screen 9 to make reciprocating motion in the vertical direction, so that the sample screen 9 can be completely inserted into the inner cavity of the liquid collecting pipe 8 when separation operation is needed, or completely separated from the inner cavity of the liquid collecting pipe 8 after the separation operation is completed.

[0052] The liquid supply mechanism is connected to the first liquid inlet of each mounting head 5, and is used to respectively supply sodium hexametaphosphate aqueous solution or deionized water solution to each sample screen 9 through the first liquid inlet.

[0053] The controller 19 can be various suitable control devices, such as a microprocessor, a programmable logic controller, etc. Specifically, the controller 19 is arranged on the base 1 (e.g. inside or on the side), and is used to control the motion speed and amplitude of the constant temperature oscillator 2, as well as the extension of the lifting mechanism and the opening and closing of the liquid supply mechanism.

[0054] Further, the lifting head 4 described above can have various suitable shapes, structures or configurations. In this embodiment, the lifting head 4 is preferably a disc structure with a trapezoidal cross section, which has a liquid storage cavity inside, and a second liquid inlet 20 and a second liquid outlet at the top and the bottom, respectively, which are in communication with the liquid storage cavity. The second liquid inlet is in communication with the liquid supply mechanism, and the number of second liquid outlets is the same as that of mounting heads 5, and each second liquid outlet is in communication with the first liquid inlet of one mounting head 5, so that the liquid provided by the liquid supply mechanism can enter the liquid storage cavity from the second liquid inlet, and then be supplied to the corresponding sample screen 9 through each second liquid outlet, the first liquid inlet. It should be noted that the number of second liquid inlets on the lifting head 4 can be determined as needed, which can be one, two or more.

[0055] Likewise, the lifting mechanism of the present application can adopt various suitable shapes or structures, in the present embodiment, the lifting mechanism preferably comprises two vertical support plates 21 extending from opposite sides of the base 1 towards the top, a horizontal support plate 18 fixed between the two vertical support plates 21 in the horizontal direction, and a telescopic rod 3 fixedly arranged at the bottom of the horizontal support plate 18, wherein the bottom of the telescopic rod 3 is fixedly connected with the lifting head 4 described above, so as to drive the lifting head 4 and the bottom component thereof to reciprocate in the vertical direction. It is also to be noted that the two vertical support plates 21 and the horizontal support plate 18 can be in a fixed splicing relationship with the base 1, or can be an integrally formed component, and in addition, the telescopic rod 3 can adopt various telescopic devices, such as a threaded telescopic rod, an electric hydraulic rod, etc.

[0056] Further, a mounting hole is preferably arranged at the center of the lifting head 4, a sleeve 6 is arranged in the mounting hole, and the lifting head 4 is fixedly sleeved on the rod body at the bottom of the telescopic rod 3 through the sleeve 6.

[0057] In addition, in order to further ensure the stability of the device, a columnar limiting boss is preferably arranged at the center of the top of the constant temperature oscillator 2, and a columnar anti-collision gasket 7 is correspondingly arranged at the bottom end of the lifting head 4.

[0058] Likewise, the liquid supply mechanism of the present application can adopt various suitable shapes or structures, in the present embodiment, the liquid supply mechanism preferably comprises:

[0059] a first liquid storage tank 10 and a second liquid storage tank 11 arranged in the base 1 in a relatively independent manner, wherein the two liquid storage tanks are respectively used for storing sodium hexametaphosphate aqueous solution and deionized water solution; and

[0060] a first liquid supply pipeline 17 extending from the first liquid storage tank 10 and extending along the inside of one of the vertical support plates 21 to the horizontal support plate 18, and the outlet of the first liquid supply pipeline 17 is in communication with the second liquid inlet 20 of the lifting head 4 after penetrating through the horizontal support plate 18; and

[0061] a second liquid supply pipeline 22 extending from the second liquid storage tank 11 and extending along the inside of the other vertical support plate 21 to the horizontal support plate 18, and the outlet of the second liquid supply pipeline 22 is in communication with the second liquid inlet 20 of the lifting head 4 after penetrating through the horizontal support plate 18; and

[0062] a first liquid supply pump 12 and a second liquid supply pump 13 respectively arranged in the first liquid storage tank 10 and the second liquid storage tank 11, and a first check valve 14 and a second check valve 15 respectively arranged on the first liquid supply pipeline 17 and the second liquid supply pipeline 22.

[0063] Further, in the device for separating particulate carbon in tailings of the present application, the number of the second liquid inlets 20 at the top of the lifting head 4 is preferably the same as the number of the mounting heads 5.

[0064] At this time, a flow divider 22 is arranged on the bottom surface of the horizontal support plate 18, the telescopic rod 3 is fixed at the bottom of the flow divider 22, and the flow divider 22 has a flow dividing chamber inside, the top of which has a third liquid inlet, and the bottom of which has the same number of third liquid outlets 16 as the second liquid inlets 20, each of which is communicated with a second liquid inlet 20 through a hose (not shown in the figure). It should be noted that the application of the hose can adapt to the up-down movement of the lifting head 4, ensure the smooth introduction of the liquid in different working positions, and provide stable liquid supply support for the processing of the tailings sample.

[0065] Further, the operation steps of the device for separating particulate carbon in tailings of the present application are as follows:

[0066] 1) Install the liquid collecting pipe 8 on the oscillation disc of the constant temperature oscillator 2, and ensure the stability of the liquid collecting pipe 8;

[0067] 2) Put 20 g of air-dried tailings sample sieved by 2 mm in each sample sieve 9, and then install the sample sieve 9 on the corresponding mounting head 5 of the lifting head 4;

[0068] 3) Move the lifting head 4 with the installed sample sieve 9 to above the liquid collecting pipe 8 by controlling the lifting mechanism through the controller 19, and insert the sample sieve 9 into the liquid collecting pipe 8;

[0069] 4) Inject 60 mL of 5% sodium hexametaphosphate aqueous solution by controlling the liquid supply mechanism through the controller 19, and then start the constant temperature oscillator 2, and set appropriate speed and amplitude to shake and mix the sample for 18 h;

[0070] 5) After mixing, move the sample sieve 9 vertically by controlling the lifting mechanism through the controller 19, and perform the sieving operation to separate the solid particles from the liquid;

[0071] 6) Inject deionized water to wash the solid particles in the sample sieve 9 by controlling the liquid supply mechanism through the controller 19;

[0072] 7) Measure the organic carbon content of the solid particles in the sample sieve 9 using an organic carbon analyzer.

[0073] In summary, the device for separating particulate carbon in tailings of the present application can effectively separate the particulate carbon in tailings, is simple and easy to operate, has high separation efficiency, and is suitable for practical production application.

[0074] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A device for separating particulate carbon from tailings, characterized in that, The utility model relates to a kind of liquid sample separation device, including: Base (1); Constant-temperature oscillator (2) is fixedly arranged on the top surface of the base (1), and can be reciprocated horizontally on the base (1), and in addition, the top surface of the constant-temperature oscillator (2) is evenly provided with a plurality of mounting holes; Liquid collecting pipe (8) is same in quantity with the number of mounting holes, and each liquid collecting pipe (8) is arranged in one mounting hole in the way of opening upward; Lifting head (4) is provided with a plurality of installation heads (5) at the bottom, which are matched with the number and position of the liquid collecting pipe (8), each installation head (5) has a first liquid inlet at the top, a first liquid outlet at the bottom and a liquid flow passage connecting the first liquid inlet and the first liquid outlet; The lifting head (4) is formed with a liquid storage cavity inside, and the top and bottom thereof are respectively provided with a second liquid inlet (20) and a second liquid outlet communicated with the liquid storage cavity, wherein the second liquid inlet is communicated with a liquid supply mechanism, and the number of second liquid outlets is same with the number of installation heads (5), each second liquid outlet is communicated with the first liquid inlet of one installation head (5); Sample screen (9) is used to place the sample to be separated inside, and the number of sample screen (9) is same with the number of installation heads (5), each sample screen (9) is detachably fixed at the bottom of one installation head (5), in addition, the outer contour shape of the sample screen (9) is similar to the inner cavity shape of the liquid collecting pipe (8), and the outer contour size is smaller than the inner cavity size of the liquid collecting pipe (8); Lifting mechanism is used to suspend the lifting head (4) on the top of the constant-temperature oscillator (2), and can drive the lifting head (4) and the installation head (5) and sample screen (9) at the bottom thereof to reciprocate along the vertical direction, so that the sample screen (9) can be completely inserted into the inner cavity of the liquid collecting pipe (8) or completely separated from the inner cavity of the liquid collecting pipe (8); Liquid supply mechanism is connected to the first liquid inlet of each installation head (5), and is used to respectively transport sodium hexametaphosphate aqueous solution or deionized water solution to each sample screen (9) through the first liquid inlet; Controller (19) is arranged on the base (1), and is used to control the constant-temperature oscillator (2), the lifting mechanism and the liquid supply mechanism.

2. The separation device of claim 1, wherein, The lifting mechanism includes: Two vertical support plates (21) extending from opposite sides on the base (1) towards the top; and Horizontal support plate (18) fixed between the two vertical support plates (21) in horizontal direction; and Telescopic rod (3) fixedly arranged at the bottom of the horizontal support plate (18), wherein the bottom of the telescopic rod (3) is fixedly connected with the lifting head (4), for driving the lifting head (4) and the components at the bottom thereof to reciprocate along the vertical direction.

3. The separation device of claim 2, wherein, The center of the lifting head (4) is provided with a mounting hole, a sleeve (6) is arranged in the mounting hole, and the lifting head (4) is sleeved on the rod body at the bottom of the telescopic rod (3) through the sleeve (6).

4. The separation device of claim 3, wherein, A columnar limiting boss is arranged at the top center of the constant temperature oscillator (2), and a columnar anti-collision gasket (7) is arranged at the bottom end of the lifting head (4) and matched with the limiting boss.

5. The separation device of claim 3, wherein, The liquid supply mechanism comprises: A first liquid storage tank (10) and a second liquid storage tank (11) are arranged in the base (1) and are relatively independent, wherein the two liquid storage tanks are respectively used for storing sodium hexametaphosphate aqueous solution and deionized water solution; and A first liquid supply pipeline (17) extends from the first liquid storage tank (10) and extends along the inside of one vertical support plate (21) to the horizontal support plate (18), and the outlet of the first liquid supply pipeline (17) is communicated with the second liquid inlet (20) of the lifting head (4) after penetrating through the horizontal support plate (18); and A second liquid supply pipeline (22) extends from the second liquid storage tank (11) and extends along the inside of another vertical support plate (21) to the horizontal support plate (18), and the outlet of the second liquid supply pipeline (22) is communicated with the second liquid inlet (20) of the lifting head (4) after penetrating through the horizontal support plate (18); and A first liquid supply pump (12) and a second liquid supply pump (13) are respectively arranged in the first liquid storage tank (10) and the second liquid storage tank (11).

6. The separation device of claim 5, wherein, The liquid supply mechanism further comprises: A first check valve (14) and a second check valve (15) are respectively arranged on the first liquid supply pipeline (17) and the second liquid supply pipeline (22).

7. The separation device of claim 5, wherein, The number of the second liquid inlets (20) at the top of the lifting head (4) is the same as the number of the mounting heads (5); In addition, a flow divider (23) is arranged on the bottom surface of the horizontal support plate (18) and extends downward, the telescopic rod (3) is fixed at the bottom of the flow divider (23), and the flow divider (23) has a flow dividing chamber in the inside, a third liquid inlet at the top and the same number of third liquid outlets (16) at the bottom as the second liquid inlets (20), and each third liquid outlet (16) is communicated with one second liquid inlet (20) through a hose.

8. The separation device of claim 5, wherein, The mounting head (5) and the sample screen (9) are threadedly connected.

9. The separation device of claim 1, wherein, An anti-skid pad is arranged at the bottom of the base (1).

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