Iron powder concentration magnetic separator

Abstract

The utility model provides a fine iron powder concentration magnetic separator, which belongs to the technical field of magnetic separators, and comprises a box body, a magnetic separation mechanism used for performing magnetic separation on materials is arranged in the box body, and a conveying assembly convenient for uniformly conveying the materials is arranged on one side of the magnetic separation mechanism. Through the magnetic separation mechanism, the second motor drives the cross rod, the rotating blades and the crushing cutter to rotate, large particles in materials are crushed, the crushed materials fall into the box body, the first motor drives the first gear to rotate, the first gear transmits power to the second gear through the chain, and then the rotating rod and the rotating roller are driven to rotate; and when the materials pass through the magnetic roller along with the belt, magnetic substances are adsorbed to leave the magnetic field range of the magnetic roller and then are discharged through the collection hopper, and non-magnetic substances are discharged from the discharge port, so that separation and collection of the magnetic substances and the non-magnetic substances are realized.

Description

Technical Field

[0001] This utility model relates to the field of magnetic separator technology, and more specifically, to a magnetic separator for the fine separation of iron concentrate. Background Technology

[0002] Iron concentrate is a high-grade iron ore product obtained after iron ore has undergone crushing, grinding, and beneficiation processes. It is an important raw material for the iron and steel industry and is mainly used in the iron and steel production process. Iron ore often contains different types of minerals. Among them, iron minerals have strong magnetism, while some gangue minerals have no magnetism or only very weak magnetism. By applying an external magnetic field, iron minerals and gangue minerals can be separated, thereby purifying the ore and improving the grade of iron concentrate.

[0003] A search revealed that Chinese Patent Publication No. CN222093565U discloses "a magnetic separator for iron concentrate, comprising a primary separator, a screening box, a screening screen, a crushing plate, a cleaning assembly, a secondary separator, a magnetic separation assembly, and electromagnetic rollers. The screening box is located on the upper side of the primary separator, and an outlet is provided between the screening box and the primary separator. The screening screen is fixedly connected to the inner wall of the screening box for easy screening of iron concentrate. Two crushing plates are provided, symmetrically arranged on the upper side of the screening screen to crush adhered iron concentrate. The cleaning assembly is located on the upper side of the screening screen. The secondary separator is installed on one side of the primary separator. The magnetic separation assembly is located between the primary separator and the secondary separator. Multiple electromagnetic rollers are provided, and the multiple electromagnetic rollers are rotatably installed inside the secondary separator via a drive seat. This technical solution solves the problem of poor purity in the screening and extraction of iron concentrate in the prior art." However, the following defects still exist:

[0004] (1) After the iron concentrate is screened, it falls into the primary selection cylinder. The electromagnetic plate directly performs magnetic separation on the iron concentrate. However, the fallen iron concentrate will be concentrated on one side of the primary selection cylinder. The magnetic field generated by the electromagnetic plate is unevenly distributed in the primary selection cylinder. Only the iron concentrate near the electromagnetic plate can be fully affected by the magnetic field, while the iron concentrate far away from the electromagnetic plate may not be effectively adsorbed due to insufficient magnetic field strength, resulting in a reduction in magnetic separation efficiency.

[0005] (2) Before screening the iron concentrate, the material directly enters the screening box through the feed hopper, which leads to uneven material distribution and material accumulation in a certain area of ​​the screening screen. This increases the risk of screen blockage, reduces screening efficiency, and consequently affects the screening and magnetic separation effects. Therefore, a magnetic separator for iron concentrate is proposed. Utility Model Content

[0006] The purpose of this invention is to address the problem of an existing magnetic separator for iron concentrate. In this device, after iron concentrate is screened, it falls into a primary separation cylinder. An electromagnetic plate directly performs magnetic separation on the iron concentrate. However, the falling iron concentrate tends to concentrate on one side of the primary separation cylinder, and the magnetic field generated by the electromagnetic plate is unevenly distributed within the cylinder. Only the iron concentrate near the electromagnetic plate can be fully affected by the magnetic field, while the iron concentrate far from the electromagnetic plate may not be effectively adsorbed due to insufficient magnetic field strength, resulting in reduced magnetic separation efficiency.

[0007] To achieve the above-mentioned objectives, this utility model provides the following technical solution:

[0008] The present invention is as follows: a magnetic separator for fine iron concentrate, comprising a housing, wherein a magnetic separation mechanism for magnetic separation of materials is provided inside the housing, and a conveying component for uniformly conveying materials is provided on one side of the magnetic separation mechanism.

[0009] The magnetic separation mechanism includes a first motor bolted to the side wall of the housing. A first gear is fixedly connected to the output end of the first motor. A chain is provided on the outside of the first gear, and a second gear is provided at the other end of the chain. A rotating rod is fixedly connected to the side wall of the first gear, and a rotating roller is provided on the side wall of the rotating rod. A rotating shaft is fixedly connected to the side wall of the second gear, and a magnetic roller is provided on the side wall of the rotating shaft. A belt is provided on the outer wall of the rotating roller and the magnetic roller. A material discharge port is opened on one side of the top of the housing, and a material outlet is opened on the side wall of the housing. A material collection hopper is connected to the bottom of the housing. The magnetic separation mechanism also includes a screening component located on the top of the housing for screening the material to be magnetically separated.

[0010] As a preferred technical solution of this utility model, the screening assembly includes a screening box that is connected to the top of the box body. A second motor is bolted to the side wall of the screening box. A crossbar is fixedly connected to the output end of the second motor. A rotating blade is fixedly connected to the side wall of the crossbar. A crushing blade is welded to the side wall of the rotating blade. A screening cylinder is fixedly connected to the inner wall of the screening box. Several holes are opened on the side wall of the screening cylinder.

[0011] As a preferred technical solution of this utility model, the conveying assembly includes a door hinged to the side wall of the screening box away from the second motor. A conveying channel is provided on the side wall of the door. A conveying motor is bolted to the side wall of the conveying channel. A connecting rod is fixedly connected to the output end of the conveying motor. A spiral blade is welded to the side wall of the connecting rod. A feeding hopper is provided at the top of the conveying channel.

[0012] As a preferred technical solution of this utility model, a guide plate is fixedly connected to the side wall of the box near the discharge port, and the guide plate is inclined.

[0013] As a preferred technical solution of this utility model, a storage box is provided on the side of the box body near the discharge port, the bottom of the storage box is provided with casters, and a pusher is bolted to one side of the top of the storage box.

[0014] As a preferred technical solution of this utility model, a conveyor belt is provided at the bottom of the hopper, and an inclined plate is fixedly connected to one end of the conveyor belt.

[0015] As a preferred technical solution of this utility model, a support plate is fixedly connected to the side wall at the bottom of the box, a support leg is fixedly connected to the bottom of the support plate, and the bottom of the support leg is provided with anti-slip feet.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] 1. Through the magnetic separation mechanism, the second motor drives the crossbar, rotating blade and crushing knife to rotate, crushing larger particles in the material. The crushed material falls into the box, the first motor drives the first gear to rotate, the first gear transmits power to the second gear through the chain, and then drives the rotating rod and rotating roller to rotate. The rotating shaft also drives the magnetic roller to rotate synchronously, and then drives the belt to run. When the material passes the magnetic roller with the belt, the magnetic material is attracted by the magnetic roller, while the non-magnetic material continues to move forward with the belt. The magnetic material attracted by the magnetic roller is discharged through the collection hopper after leaving the magnetic field range of the magnetic roller, while the non-magnetic material is discharged from the discharge port, realizing the separation and collection of magnetic and non-magnetic materials and improving the magnetic separation accuracy.

[0018] 2. Through the set conveying components, the operator puts the iron concentrate material to be magnetically separated into the conveying channel through the feeding hopper. The conveying motor drives the connecting rod and the spiral blade to rotate. The rotating spiral blade generates a forward thrust in the conveying channel, pushing the material to move to one side along the conveying channel and into the screening box. This ensures the uniformity and stability of the material conveying, avoids the impact of unstable material supply on the subsequent screening and magnetic separation stages, and thus improves the screening and magnetic separation effect. Attached Figure Description

[0019] Figure 1 A schematic diagram of the structure of the magnetic separator for iron concentrate fine processing provided by this utility model;

[0020] Figure 2 A schematic diagram of one part of the magnetic separation mechanism of the iron concentrate magnetic separator provided by this utility model;

[0021] Figure 3 This is a schematic diagram of the second part of the magnetic separation mechanism of the iron concentrate magnetic separator provided by this utility model;

[0022] Figure 4A schematic diagram of the screening component structure of the magnetic separator for iron concentrate fine selection provided by this utility model;

[0023] Figure 5 A schematic diagram of the second motor structure of the iron concentrate magnetic separator provided by this utility model;

[0024] Figure 6 A schematic diagram of the conveying component structure of the magnetic separator for iron concentrate fines provided by this utility model.

[0025] The diagram shows: 1. Housing; 2. Magnetic separation mechanism; 3. Conveying assembly; 4. Guide plate; 5. Storage bin; 6. Casters; 7. Pusher; 8. Conveyor belt; 9. Inclined plate; 10. Support plate; 11. Support leg; 12. Anti-slip foot; 201. First motor; 202. First gear; 203. Chain; 204. Second gear; 205. Rotating rod; 206. Rotating roller; 207. Rotating shaft; 208. Magnetic roller; 209. Belt; 210, feed inlet; 211, discharge outlet; 212, hopper; 213, screening assembly; 2131, screening box; 2132, second motor; 2133, crossbar; 2134, rotating blade; 2135, crushing blade; 2136, screening cylinder; 2137, hole; 301, door; 302, conveying channel; 303, conveying motor; 304, connecting rod; 305, spiral blade; 306, feeding hopper. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model.

[0027] Therefore, the following detailed description of the embodiments of this utility model is not intended to limit the scope of the claimed utility model, but merely to illustrate some embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0028] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0029] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0030] like Figure 1As shown, this embodiment proposes a magnetic separator for fine iron concentrate, including a housing 1. The housing 1 is equipped with a magnetic separation mechanism 2 for magnetic separation of materials. A conveying component 3 is provided on one side of the magnetic separation mechanism 2 to facilitate the uniform conveying of materials.

[0031] like Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, the magnetic separation mechanism 2 includes a first motor 201 bolted to the side wall of the housing 1. A first gear 202 is fixedly connected to the output end of the first motor 201. The first motor 201 provides driving force for the magnetic separation process, causing the first gear 202 to rotate. A chain 203 is provided on the outside of the first gear 202, and a second gear 204 is provided at the other end of the chain 203. The chain 203 connects the first gear 202 and the second gear 204, serving as a power transmission mechanism. A rotating rod 205 is fixedly connected to the side wall of the first gear 202, and a rotating roller 206 is provided on the side wall of the rotating rod 205. A rotating shaft 207 is fixedly connected to the side wall of gear 204. A magnetic roller 208 is provided on the side wall of rotating shaft 207. The second gear 204 rotates synchronously with the first gear 202 under the drive of chain 203, thereby driving rotating shaft 207 and magnetic roller 208 to rotate. A belt 209 is provided on the outer wall of rotating roller 206 and magnetic roller 208. The surface of magnetic roller 208 has a magnetic field. When the material to be magnetically separated passes through magnetic roller 208 with belt 209, the magnetic material is attracted by magnetic roller 208. A discharge port 210 is opened on one side of the top of box 1. The discharge port 210 is the entrance for the material to be magnetically separated to enter the magnetic separation mechanism 2. Material falls evenly onto belt 209 through discharge port 210. Discharge port 211 is provided on the side wall of housing 1. A collection hopper 212 is connected to the bottom of housing 1 to collect magnetic materials for subsequent processing. The magnetic separation mechanism 2 also includes a screening component 213 located at the top of housing 1 for screening the material to be magnetically separated. During operation, the iron concentrate material to be magnetically separated falls into housing 1 through discharge port 210. Then, the first motor 201 is started, driving the first gear 202 to rotate. The first gear 202 transmits power to the second gear 204 via chain 203, causing the second gear 204 to rotate synchronously with the first gear 202. This, in turn, drives the rotating rod 205 and rotating roller 206 to rotate. The rotating shaft 207 on the side wall of the second gear 204 also rotates synchronously, driving the magnetic roller 208 to rotate. Roller 206 and magnetic roller 208 jointly drive belt 209. When the material passes magnetic roller 208 with belt 209, the magnetic field on the surface of magnetic roller 208 takes effect. Magnetic substances in the iron concentrate are attracted by magnetic roller 208 and adhere to the surface of belt 209 as it rotates with magnetic roller 208. Non-magnetic substances are not affected by the magnetic field and continue to move forward with belt 209. As belt 209 rotates, the magnetic substances attracted by magnetic roller 208 fall off belt 209 due to gravity after leaving the magnetic field range of magnetic roller 208 and are discharged through collection hopper 212 for subsequent processing. Non-magnetic substances are discharged from discharge port 211. This achieves the separation and collection of magnetic and non-magnetic substances, improves magnetic separation accuracy, ensures that the quality of the selected iron concentrate meets the requirements, guarantees that the magnetic separation process can be carried out continuously, reduces downtime, and improves magnetic separation efficiency.

[0032] like Figure 4 andFigure 5 As shown, the screening assembly 213 includes a screening box 2131 connected to the top of the housing 1. A second motor 2132 is bolted to the side wall of the screening box 2131. A crossbar 2133 is fixedly connected to the output end of the second motor 2132. The second motor 2132 drives the crossbar 2133 to rotate through the output end, providing power for the crushing and stirring operations during the screening process. A rotating blade 2134 is fixedly connected to the side wall of the crossbar 2133. The rotation of the rotating blade 2134 can stir the material in the screening box 2131. The material is fully agitated within the screening box 2131. Crushing blades 2135 are welded to the side wall of the rotating blades 2134. These blades crush lumps or larger particles in the material. A screening cylinder 2136 is fixedly connected to the inner wall of the screening box 2131. Several holes 2137 are provided on the side wall of the screening cylinder 2136 to allow materials of varying particle sizes to pass through. During use, the iron concentrate to be magnetically separated is fed into the screening box 2131. At this time, the material interacts with the screening box 2131. When the crushing blade 2135, rotating blade 2134, and screening cylinder 2136 inside 31 come into contact, the second motor 2132 is started, driving the crossbar 2133 to rotate, which in turn drives the rotating blade 2134 and crushing blade 2135 to rotate synchronously. During the high-speed rotation, the crushing blade 2135 crushes agglomerates or larger particles in the material, breaking them down into smaller particles. The holes 2137 act as a screen, allowing material particles smaller than the diameter of the holes 2137 to pass through and fall from the screening cylinder 2136. The material enters the lower box 1 and proceeds to the subsequent magnetic separation stage. Particles larger than the diameter of the holes 2137 are trapped in the screening cylinder 2136 and continue to be crushed by the crushing blades 2135 until the particle size meets the requirements and can pass through the holes 2137. This makes the iron concentrate material entering the magnetic separation stage more uniform in particle size. The uniform particle size is conducive to the adsorption of magnetic materials by the magnetic roller 208, reducing problems such as incomplete magnetic separation or impurity mixing caused by large differences in particle size, thereby improving the purity and quality of the iron concentrate after magnetic separation.

[0033] like Figure 6As shown, the conveying assembly 3 includes a door 301 hinged to the side wall of the screening box 2131 away from the second motor 2132. A conveying channel 302 is connected to the side wall of the door 301, which is the channel for conveying materials into the screening box 2131. A conveying motor 303 is bolted to the side wall of the conveying channel 302. A connecting rod 304 is fixedly connected to the output end of the conveying motor 303. A spiral blade 305 is welded to the side wall of the connecting rod 304. The conveying motor 303 drives the connecting rod 304 and the spiral blade 305 to rotate, driving the material flow in the conveying channel 302. A feeding hopper 306 is connected to the top of the conveying channel 302, which facilitates the even distribution of the material to be processed. The material is evenly fed into the conveying channel 302. During use, the operator feeds the iron concentrate to be magnetically separated into the conveying channel 302 through the feeding hopper 306. Then, the conveying motor 303 is started, which drives the connecting rod 304 and the spiral blade 305 to rotate. The rotating spiral blade 305 generates a forward thrust in the conveying channel 302, pushing the material along the conveying channel 302 to one side and into the screening box 2131, providing material for the subsequent screening and magnetic separation stages. The rotation of the spiral blade 305 can stably push the material forward, ensuring the uniformity and stability of the material conveying, avoiding the impact of unstable material supply on the subsequent screening and magnetic separation stages, thereby improving the screening and magnetic separation effect.

[0034] like Figure 1 As shown, a guide plate 4 is fixedly connected to the side wall of the box 1 near the discharge port 211. The guide plate 4 is inclined. When non-magnetic materials are discharged from the discharge port 211, they will slide down along the inclined surface of the guide plate 4, which avoids the materials from scattering randomly at the discharge port 211 and improves the accuracy and efficiency of material collection.

[0035] like Figure 1 As shown, a storage box 5 is provided on the side of the box 1 near the discharge port 211. The bottom of the storage box 5 is provided with casters 6, and a pusher 7 is attached to one side of the top of the storage box 5. After magnetic separation, the non-magnetic material is discharged from the discharge port 211 and falls directly into the storage box 5, which avoids the material from scattering in the surrounding environment and facilitates subsequent collection and processing.

[0036] like Figure 1 As shown, a conveyor belt 8 is provided at the bottom of the collection hopper 212. An inclined plate 9 is fixedly connected to one end of the conveyor belt 8. The conveyor belt 8 transports the magnetic materials after magnetic separation, preventing the materials from accumulating at the collection hopper 212 and ensuring the continuity of magnetic separation. The inclined plate 9 can guide the materials to a relatively concentrated area, which is convenient for subsequent collection and sorting work.

[0037] like Figure 1As shown, a support plate 10 is fixedly connected to the side wall at the bottom of the housing 1, and a support leg 11 is fixedly connected to the bottom of the support plate 10. The bottom of the support leg 11 is provided with an anti-slip foot 12. The support plate 10 evenly distributes the external force on the housing 1 to the support leg 11, so as to avoid the housing 1 from being deformed or damaged due to excessive local force. The anti-slip foot 12 can increase the friction between the support leg 11 and the ground, prevent the equipment from sliding when subjected to external force, and ensure that the equipment can be stably fixed in the designated position.

[0038] Specifically, when using this iron concentrate magnetic separator: First, the operator feeds the iron concentrate to be magnetically separated into the conveying channel 302 through the feeding hopper 306. Then, the conveying motor 303 is started, driving the connecting rod 304 and the spiral blade 305 to rotate. The rotating spiral blade 305 generates a forward thrust within the conveying channel 302, pushing the material along the conveying channel 302 to one side and into the screening box 2131 (e.g., ...). Figure 6 (As shown), then the second motor 2132 is started, driving the crossbar 2133 to rotate, which in turn drives the rotating blade 2134 and the crushing blade 2135 to rotate synchronously. During the high-speed rotation, the crushing blade 2135 crushes the lumps or larger particles in the material into smaller particles. Particles smaller than the diameter of the hole 2137 can pass through the hole 2137 and fall into the lower box 1 for subsequent magnetic separation. Particles larger than the diameter of the hole 2137 are retained in the screening cylinder 2136 and continue to be crushed by the crushing blade 2135 until the particle size meets the requirements and can pass through the hole 2137. The iron concentrate material to be magnetically separated falls into the box 1 from the discharge port 210. Then the first motor 201 is started, driving the first gear 202 to rotate. The first gear 202 transmits power to the second gear 204 through the chain 203, causing the second gear to rotate. The first gear 204 rotates synchronously with the first gear 202, thereby driving the rotating rod 205 and the rotating roller 206 to rotate. The rotating shaft 207 on the side wall of the second gear 204 also rotates synchronously, driving the magnetic roller 208 to rotate. The rotating roller 206 and the magnetic roller 208 together drive the belt 209 to rotate. When the material passes the magnetic roller 208 with the belt 209, the magnetic field on the surface of the magnetic roller 208 takes effect. The magnetic substances in the iron concentrate are attracted by the magnetic roller 208 and adhere to the surface of the belt 209, rotating with the magnetic roller 208. The non-magnetic substances are not affected by the magnetic field and continue to move forward with the belt 209. As the belt 209 rotates, the magnetic substances attracted by the magnetic roller 208 fall off the belt 209 due to gravity after leaving the magnetic field range of the magnetic roller 208 and are discharged through the collection hopper 212 for subsequent processing. The non-magnetic substances are discharged from the discharge port 211, realizing the separation and collection of magnetic and non-magnetic substances (e.g., Figure 2 , Figure 3 , Figure 4 and Figure 5 (As shown).

[0039] All technical features in this embodiment can be freely combined according to actual needs.

[0040] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. A magnetic separator for refining iron concentrate, comprising a housing (1), characterized in that, The box (1) is equipped with a magnetic separation mechanism (2) for magnetic separation of materials, and a conveying component (3) is provided on one side of the magnetic separation mechanism (2) to facilitate the uniform conveying of materials. The magnetic separation mechanism (2) includes a first motor (201) bolted to the side wall of the housing (1). A first gear (202) is fixedly connected to the output end of the first motor (201). A chain (203) is provided on the outside of the first gear (202). A second gear (204) is provided at the other end of the chain (203). A rotating rod (205) is fixedly connected to the side wall of the first gear (202). A rotating roller (206) is provided on the side wall of the rotating rod (205). A rotating roller (206) is fixed on the side wall of the second gear (204). A rotating shaft (207) is connected to the magnetic roller (208) on the side wall of the rotating shaft (207). A belt (209) is provided on the outer wall of the rotating roller (206) and the magnetic roller (208). A material discharge port (210) is opened on one side of the top of the box (1). A material discharge port (211) is opened on the side wall of the box (1). A material collection hopper (212) is connected to the bottom of the box (1). The magnetic separation mechanism (2) also includes a screening component (213) set on the top of the box (1) for screening the material to be magnetically separated.

2. The magnetic separator for iron concentrate refining according to claim 1, characterized in that, The screening assembly (213) includes a screening box (2131) connected to the top of the box (1). A second motor (2132) is bolted to the side wall of the screening box (2131). A crossbar (2133) is fixedly connected to the output end of the second motor (2132). A rotating blade (2134) is fixedly connected to the side wall of the crossbar (2133). A crushing blade (2135) is welded to the side wall of the rotating blade (2134). A screening cylinder (2136) is fixedly connected to the inner wall of the screening box (2131). Several holes (2137) are opened on the side wall of the screening cylinder (2136).

3. The magnetic separator for iron concentrate refining according to claim 2, characterized in that, The conveying assembly (3) includes a door (301) hinged to the side wall of the screening box (2131) away from the second motor (2132). A conveying channel (302) is connected to the side wall of the door (301). A conveying motor (303) is bolted to the side wall of the conveying channel (302). A connecting rod (304) is fixedly connected to the output end of the conveying motor (303). A spiral blade (305) is welded to the side wall of the connecting rod (304). A feeding hopper (306) is connected to the top of the conveying channel (302).

4. The magnetic separator for iron concentrate refining according to claim 1, characterized in that, A guide plate (4) is fixedly connected to the side wall of the box (1) near the discharge port (211), and the guide plate (4) is inclined.

5. The magnetic separator for iron concentrate refining according to claim 1, characterized in that, A storage box (5) is provided on the side of the box (1) near the discharge port (211). The bottom of the storage box (5) is provided with a moving wheel (6), and a pusher (7) is bolted to one side of the top of the storage box (5).

6. The magnetic separator for iron concentrate refining according to claim 1, characterized in that, The bottom of the hopper (212) is provided with a conveyor belt (8), and one end of the conveyor belt (8) is fixedly connected to an inclined plate (9).

7. The magnetic separator for iron concentrate refining according to claim 1, characterized in that, A support plate (10) is fixedly connected to the side wall at the bottom of the box (1), and a support leg (11) is fixedly connected to the bottom of the support plate (10). The bottom of the support leg (11) is provided with an anti-slip foot (12).

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