Beneficiation concentration tank for gravity magnetic separation of iron concentrate powder tailings

Abstract

The invention relates to the technical field of ore concentration tanks, and provides a gravity magnetic separation iron concentrate powder tailing beneficiation concentration tank which comprises a tank body, a roller, a gravity magnetic separation device, a cleaning mechanism, a rotating mechanism, a buffering mechanism and a discharging mechanism, a feeding port is formed in the top end of the tank body, and a discharging port is formed in one side of the tank body. The roller is rotationally connected into the tank body through the two partition plates, the roller is located under the feeding port, the gravity magnetic separator is installed between the two partition plates through a fixing rod, the cleaning mechanism is arranged on the inner wall of one side of the tank body, and the rotating mechanism is arranged at one end of the roller. The technical problems that in the prior art, due to the fact that water flow is too large, iron concentrate tailings subjected to gravity magnetic separation are easily washed away, wet tailings are easily attached to gravity magnetic separation, the magnetic force of the gravity magnetic separation is easily reduced, adsorption of the gravity magnetic separation to the iron concentrate tailings is not facilitated, and the separation efficiency of the gravity magnetic separation to the iron concentrate tailings is reduced are solved.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to the technical field of ore concentration tanks, and specifically, to a gravity magnetic separation iron concentrate tailings ore dressing concentration tank. Background Art

[0002] Gravity magnetic separation iron concentrate tailings separation is a process of further recovering useful minerals or treating tailings from the tailings generated in the production process of iron concentrate. When further treating the tailings, the gravity magnetic separation iron concentrate tailings ore dressing concentration tank is generally used to further recover the tailings.

[0003] In the existing gravity magnetic separation iron concentrate tailings ore dressing concentration tank, the water flow of the iron concentrate tailings is difficult to decelerate when entering the concentration tank. During the gravity magnetic separation process, it is easy to cause excessive water flow to wash away the well-gravity-magnetized iron concentrate tailings. Moreover, in the existing device, since the iron concentrate tailings are wet and easily adsorbed onto the gravity magnetic separator, if the iron concentrate tailings on the gravity magnetic separator are not cleaned in time, it is easy to reduce the magnetic force of the gravity magnetic separation, which is not only unfavorable for the adsorption of the iron concentrate tailings by the gravity magnetic separation, but also reduces the separation efficiency of the gravity magnetic separation for the iron concentrate tailings. Summary of the Invention

[0004] To overcome the above defects, embodiments of the present disclosure provide a gravity magnetic separation iron concentrate tailings ore dressing concentration tank, which is used to solve the technical problems in the prior art that excessive water flow is easy to wash away the well-gravity-magnetized iron concentrate tailings, and the wet tailings are easily adhered to the gravity magnetic separator, which is easy to reduce the magnetic force of the gravity magnetic separation, is unfavorable for the adsorption of the iron concentrate tailings by the gravity magnetic separation, and reduces the separation efficiency of the gravity magnetic separation for the iron concentrate tailings.

[0005] According to one aspect, at least one embodiment of the present disclosure provides a gravity magnetic separation iron concentrate tailings ore dressing concentration tank, including a tank body. An inlet is opened at the top end of the tank body, and an outlet is opened at one side of the tank body. It further includes: a roller, a gravity magnetic separator, a cleaning mechanism, a rotating mechanism, a buffering mechanism, and an outlet mechanism. The roller is rotatably connected in the tank body through two partitions. The roller is located directly below the inlet and can contact the tailings entering the tank body. The gravity magnetic separator is installed between the two partitions through a fixed rod, and the gravity magnetic separator contacts the inner wall of the roller. The cleaning mechanism is arranged on one inner wall of the tank body and can separate the iron concentrate adsorbed on the roller from the roller. The rotating mechanism is arranged at one end of the roller and can drive the roller to rotate when the gravity magnetic separator adsorbs the iron concentrate. The buffering mechanism is arranged at the inlet to block the flow rate of the water flow. The outlet mechanism is arranged at the outlet and can discharge the separated iron concentrate out of the tank body.

[0006] In order to separate the iron concentrate on the drum from the drum, the cleaning mechanism includes: a cleaning plate, a pushing plate, and a driving component. The cleaning plate is located inside the tank, and the cleaning end of the cleaning plate contacts the circumferential surface of the drum. The pushing plate is fixedly connected to one side of the cleaning plate, and the driving component is arranged on one side of the tank for driving the pushing plate and the cleaning plate to approach or move away from the drum.

[0007] In order to drive the cleaning plate to approach the drum to clean the iron concentrate on the drum, the driving component includes: a sliding rod and a first electric cylinder. There are two sliding rods, and both of the two sliding rods are fixedly connected to one side of the pushing plate. The two sliding rods are slidably connected to one side of the tank. The first electric cylinder is installed on one side of the tank, and the output end of the first electric cylinder penetrates through the tank and is fixedly connected to one side of the pushing plate.

[0008] In order to drive the drum to rotate, the rotating mechanism includes: a toothed ring and a power component. The toothed ring is fixedly connected to one end of the drum for driving the drum to rotate, and the power component is arranged on the side wall of the tank and can drive the toothed ring to rotate.

[0009] In order to drive the toothed ring and the drum to rotate synchronously, the power component includes: a driving gear and a first motor. The driving gear is rotatably connected to the inner wall of the tank, the driving gear meshes with the toothed ring, the first motor is installed on one side of the tank, and the output end of the first motor penetrates through the tank and is fixedly connected to the driving gear.

[0010] In order to slow down the flow rate of the water flow, the buffer mechanism includes: a guiding plate and buffer columns. The guiding plate is fixedly connected at the feed inlet, the bottom end of the guiding plate contacts the drum, there are multiple buffer columns, and all of the multiple buffer columns are fixedly connected to the inner top wall of the tank. The bottom ends of the multiple buffer columns contact the circumferential surface of the tank.

[0011] In order to discharge the separated iron concentrate and tailings, the discharging mechanism includes: support plates, a transmission shaft, a transmission belt, and a second motor. There are two support plates, and both of the two support plates are fixedly connected at the discharge outlet. There are two transmission shafts. One of the transmission shafts is rotatably connected to the opposite sides of two partition plates, and the other transmission shaft is rotatably connected to the opposite sides of the two support plates. The transmission belt is connected between the two transmission shafts for conveying the iron concentrate. The second motor is installed on one side of one of the partition plates, and the output end of the second motor penetrates through the partition plate and is fixedly connected to one of the transmission shafts.

[0012] In order to discharge water and tailings, a shunting mechanism is fixedly connected at the discharge port. The shunting mechanism includes: a shunting trough and a converging plate. The shunting trough is fixedly connected inside the discharge port. There are two converging plates, and the two converging plates are fixedly connected to the inner wall of the tank body. The shunting trough is fixedly connected to the two converging plates.

[0013] In order to increase the stability of the sliding rod during sliding, two sliding holes are formed in the tank body, and the two sliding rods are respectively slidably connected in the two sliding holes.

[0014] In order to receive water and tailings, the shunting trough is located directly below the roller.

[0015] The beneficial effects of the embodiments of the present disclosure are as follows: 1. In the present disclosure, through the cooperation between the roller, gravity magnetic separation, cleaning mechanism and rotating mechanism, the iron concentrate powder in the tailings can be separated from the tailings. Through the arrangement of the rotating mechanism and the cleaning mechanism, the iron concentrate powder adsorbed on the roller can be separated from the roller, so that the iron concentrate powder falls off the roller, and the iron concentrate powder can be converged and collected, improving the adsorption capacity of gravity magnetic separation and the separation efficiency of iron concentrate powder and tailings.

[0016] 2. In the present disclosure, through the arrangement of the discharging mechanism and the shunting mechanism, the iron concentrate powder and the tailings can be discharged separately.

[0017] 3. In the present disclosure, through the arrangement of the buffer mechanism, the impact force and flow rate of the water flow can be slowed down, and the iron concentrate powder adsorbed on the roller can be effectively prevented from being washed away by the water flow. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following will briefly introduce the drawings required to be used in the description of the embodiments of the present disclosure. Obviously, the following drawings are only some exemplary embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained according to the content of the exemplary embodiments of the present disclosure and these drawings without creative efforts.

[0019] Figure 1 It is a schematic diagram of the overall structure in an embodiment of the present disclosure; Figure 2 It is a schematic diagram of the structure from another angle in an embodiment of the present disclosure; Figure 3 It is a schematic cross-sectional view in an embodiment of the present disclosure; Figure 4 It is a schematic cross-sectional view from another angle in an embodiment of the present disclosure; Figure 5 It is a schematic diagram of the internal structure of the tank body in an embodiment of the present disclosure; Figure 6 Schematic structural view of the drum in cross-section in an embodiment of the present disclosure; Figure 7 Schematic structural view of the cooperation between the drum and two partition plates in an embodiment of the present disclosure.

[0020] In the figure: 1, tank body; 2, drum; 3, partition plate; 4, gravity magnetic separation; 5, fixing rod; 6, cleaning plate; 7, pushing plate; 8, sliding rod; 9, first electric cylinder; 10, toothed ring; 11, driving gear; 12, first motor; 13, guiding plate; 14, buffer column; 15, supporting plate; 16, transmission shaft; 17, transmission belt; 18, second motor; 19, diversion groove; 20, converging plate. Specific embodiments The present disclosure will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present disclosure, rather than limiting the present disclosure.

[0021] To make the drawings concise, only the parts related to the disclosure are schematically shown in each drawing, and they do not represent the actual structure of the product. In addition, to make the drawings concise and easy to understand, in some drawings, parts with the same structure or function are only schematically shown for one of them, or only one of them is marked. In this article, "one" not only means "only this one", but also means "more than one" situation, and "several" includes "two" and "more than two".

[0022] In this article, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific situations.

[0023] In the present disclosure, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or only means that the first feature is at a higher horizontal height than the second feature. The first feature being "below", "below" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or only means that the first feature is at a lower horizontal height than the second feature.

[0024] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "left", "right", etc. are based on the orientation or positional relationships shown in the drawings. They are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present disclosure.

[0025] In addition, in the description of this application, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be construed as indicating or implying relative importance.

[0026] As Figures 1 to 7 shown, it shows a gravity magnetic separation iron concentrate tailings beneficiation thickening tank in an embodiment of the present disclosure, including a tank body 1. An inlet is provided at the top of the tank body 1, and an outlet is provided on one side of the tank body 1. It further includes: a roller 2, a gravity magnetic separator 4, a cleaning mechanism, a rotating mechanism, a buffering mechanism, and a discharging mechanism. The roller 2 is rotatably connected in the tank body 1 through two partition plates 3. The roller 2 is located directly below the inlet and can contact the tailings entering the tank body 1. The gravity magnetic separator 4 is installed between the two partition plates 3 through a fixing rod 5. The gravity magnetic separator 4 contacts the inner wall of the roller 2. The cleaning mechanism is arranged on one inner wall of the tank body 1 and can separate the iron concentrate adsorbed on the roller 2 from the roller 2. The rotating mechanism is arranged at one end of the roller 2 and can drive the roller 2 to rotate when the gravity magnetic separator 4 adsorbs iron concentrate. The buffering mechanism is arranged at the inlet to block the flow rate of water. The discharging mechanism is arranged at the outlet and can discharge the separated iron concentrate out of the tank body 1. Through the cooperation among the roller 2, the gravity magnetic separator 4, the cleaning mechanism, and the rotating mechanism, the iron concentrate in the tailings can be separated from the tailings. Through the setting of the rotating mechanism and the cleaning mechanism, the iron concentrate adsorbed on the roller 2 can be separated from the roller 2, enabling the iron concentrate to fall off the roller 2, and the iron concentrate can be gathered and collected, improving the adsorption capacity of the gravity magnetic separator 4 and the separation efficiency of the iron concentrate and the tailings.

[0027] In order to separate the iron concentrate powder on the roller 2 from the roller 2, the cleaning mechanism includes: a cleaning plate 6, a pushing plate 7 and a driving assembly. The cleaning plate 6 is located inside the tank body 1, and the cleaning end of the cleaning plate 6 contacts the circumferential surface of the roller 2. The pushing plate 7 is fixedly connected to one side of the cleaning plate 6. The driving assembly is arranged on one side of the tank body 1 and is used to drive the pushing plate 7 and the cleaning plate 6 to approach or move away from the roller 2. The driving assembly includes: a slide bar 8 and a first electric cylinder 9. There are two slide bars 8, and both of the two slide bars 8 are fixedly connected to one side of the pushing plate 7. The two slide bars 8 are slidably connected to one side of the tank body 1. Two slide holes are formed in the tank body 1, and the two slide bars 8 are respectively slidably connected in the two slide holes. The first electric cylinder 9 is installed on one side of the tank body 1, and the output end of the first electric cylinder 9 penetrates the tank body 1 and is fixedly connected to one side of the pushing plate 7. When the wet iron concentrate powder on the roller 2 needs to be separated from the roller 2, the first electric cylinder 9 installed on the tank body 1 drives the pushing plate 7 and the cleaning plate 6 to contact the roller 2. Through the rotation of the roller 2, the iron concentrate powder adsorbed on the roller 2 is driven away from the gravity magnetic separation 4, and by contacting the cleaning plate 6 with the roller 2, the iron concentrate powder adhered to the roller 2 is scraped off, so as to realize the cleaning of the surface of the roller 2.

[0028] In order to drive the roller 2 to rotate, the rotating mechanism includes: a toothed ring 10 and a power assembly. The toothed ring 10 is fixedly connected to one end of the roller 2 and is used to drive the roller 2 to rotate. The power assembly is arranged on the side wall of the tank body 1 and can drive the toothed ring 10 to rotate. The power assembly includes: a driving gear 11 and a first motor 12. The driving gear 11 is rotatably connected to the inner wall of the tank body 1, and the driving gear 11 meshes with the toothed ring 10. The first motor 12 is installed on one side of the tank body 1, and the output end of the first motor 12 penetrates the tank body 1 and is fixedly connected to the driving gear 11. When it is necessary to drive the roller 2 to rotate, the first motor 12 drives the driving gear 11 to rotate. When the driving gear 11 rotates, it drives the toothed ring 10 and the roller 2 to rotate. When the roller 2 rotates, the position of the iron concentrate powder adsorbed on the roller 2 is transferred, so that the iron concentrate powder is away from the gravity magnetic separation 4 and the iron concentrate powder is separated from the roller 2.

[0029] In order to slow down the flow rate of the water flow, the buffering mechanism includes: a guiding plate 13 and buffering columns 14. The guiding plate 13 is fixedly connected at the feeding port, and the bottom end of the guiding plate 13 contacts the roller 2. There are multiple buffering columns 14, and all of the multiple buffering columns 14 are fixedly connected to the inner top wall of the tank body 1. The bottom ends of the multiple buffering columns 14 contact the circumferential surface of the tank body 1. When the tailings and water enter the tank body 1 through the feeding port, the water flow flows towards the roller 2 through the guiding plate 13 and the speed of the water flow is slowed down through the buffering columns 14, so as to effectively prevent the water flow from washing away the iron concentrate powder adsorbed on the roller 2.

[0030] In order to discharge the separated iron concentrate and tailings, the discharging mechanism includes: a support plate 15, a transmission shaft 16, a transmission belt 17 and a second motor 18. There are two support plates 15, and both support plates 15 are fixedly connected to the discharging port. There are two transmission shafts 16. One of the transmission shafts 16 is rotatably connected to the opposite sides of the two partitions 3, and the other transmission shaft 16 is rotatably connected to the opposite sides of the two support plates 15. The transmission belt 17 is drivingly connected between the two transmission shafts 16 for conveying the iron concentrate. The second motor 18 is installed on one side of one of the partitions 3. The output end of the second motor 18 penetrates the partition 3 and is fixedly connected to one of the transmission shafts 16. The separated iron concentrate falls on the transmission belt 17, and then the second motor 18 drives the transmission shaft 16 to rotate. Through the transmission of the transmission belt 17 between the two transmission shafts 16, the iron concentrate on the transmission belt 17 is conveyed outside the tank body 1.

[0031] In order to discharge the water and tailings, a flow splitting mechanism is fixedly connected at the discharging port. The flow splitting mechanism includes: a flow splitting groove 19 and a converging plate 20. The flow splitting groove 19 is located directly below the roller 2. The flow splitting groove 19 is fixedly connected inside the discharging port. There are two converging plates 20, and both converging plates 20 are fixedly connected to the inner wall of the tank body 1. The flow splitting groove 19 is fixedly connected to the two converging plates 20. After the tailings falling into the tank body 1 pass through the roller 2, the converging plate 20 causes the tailings to fall into the flow splitting groove 19, and the tailings are discharged through the flow splitting groove 19.

[0032] Working principle: When it is necessary to separate the iron concentrate from the tailings, the tailings containing iron concentrate are poured into the tank body 1. When the tailings and water enter the tank body 1 through the feeding port, the iron concentrate in the tailings is adsorbed onto the roller 2 by the gravity magnetic separator 4. The tailings and water continue to fall into the flow splitting groove 19. The water flows through the guiding plate 13 towards the roller 2 and passes through the buffer column 14 to slow down the flow rate of the water, thereby effectively preventing the water from washing away the iron concentrate adsorbed on the roller 2. After a relatively thick layer of iron concentrate is adsorbed on the roller 2, the first motor 12 drives the driving gear 11 to rotate. When the driving gear 11 rotates, it drives the toothed ring 10 and the roller 2 to rotate. When the roller 2 rotates, the position of the iron concentrate adsorbed on the roller 2 is transferred, so that the iron concentrate is far away from the gravity magnetic separator 4, and the iron concentrate is separated from the roller 2. The first electric cylinder 9 installed on the tank body 1 drives the pushing plate 7 and the cleaning plate 6 to contact the roller 2. Through the rotation of the roller 2, the iron concentrate adsorbed on the roller 2 is driven away from the gravity magnetic separator 4, and the cleaning plate 6 contacts the roller 2 to scrape off the iron concentrate adhered to the roller 2, thereby realizing the cleaning of the surface of the roller 2. The scraped-off iron concentrate falls on the transmission belt 17. The second motor 18 drives the transmission shaft 16 to rotate. Through the transmission of the transmission belt 17 between the two transmission shafts 16, the iron concentrate on the transmission belt 17 is conveyed outside the tank body 1, and the tailings converged in the flow splitting groove 19 through the converging plate 20 are discharged outside the tank body 1.

[0033] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure rather than to limit them. Although the present disclosure has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present disclosure can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present disclosure, and they should all be covered by the scope of the claims of the present disclosure.

Claims

1. A gravity magnetic separation iron concentrate tailings beneficiation and concentration tank, comprising a tank body (1), wherein a feed inlet is provided at the top end of the tank body (1), and a discharge outlet is provided on one side of the tank body (1), characterized in that, It further includes: A drum (2), which is rotatably connected inside the tank body (1) through two partition plates (3). The drum (2) is located directly below the feed inlet and can contact the tailings entering the tank body (1). Gravity magnetic separation (4), which is installed between the two partition plates (3) through a fixing rod (5). The gravity magnetic separation (4) contacts the inner wall of the drum (2). A cleaning mechanism, which is arranged on one inner wall of the tank body (1). The cleaning mechanism includes: A cleaning plate (6), which is located inside the tank body (1). The cleaning end of the cleaning plate (6) contacts the circumferential surface of the drum (2) and can separate the iron concentrate adsorbed on the drum (2) from the drum (2). A rotating mechanism, which is arranged at one end of the drum (2). The rotating mechanism includes: A toothed ring (10), which is fixedly connected to one end of the drum (2) and is used to drive the drum (2) to rotate. It can drive the drum (2) to rotate when the gravity magnetic separation (4) adsorbs iron concentrate. A buffer mechanism, which is arranged at the feed inlet and is used to block the flow rate of water.

2. The beneficiation and thickening tank for gravity magnetic separation iron concentrate tailings according to claim 1, characterized in that, The cleaning mechanism further includes: A push plate (7), which is fixedly connected to one side of the cleaning plate (6). A driving component, which is arranged on one side of the tank body (1) and is used to drive the push plate (7) and the cleaning plate (6) to approach or move away from the drum (2).

3. A gravity magnetic separation iron concentrate tailings beneficiation thickening tank according to claim 2, characterized in that, The driving component includes: Two sliding rods (8), both of which are fixedly connected to one side of the push plate (7). The two sliding rods (8) are slidably connected to one side of the tank body (1). A first electric cylinder (9), which is installed on one side of the tank body (1). The output end of the first electric cylinder (9) penetrates through the tank body (1) and is fixedly connected to one side of the push plate (7).

4. A gravity magnetic separation iron concentrate tailings beneficiation thickening tank according to claim 3, characterized in that, The rotating mechanism includes: A toothed ring (10), which is fixedly connected to one end of the drum (2) and is used to drive the drum (2) to rotate. A power component, which is arranged on the side wall of the tank body (1) and can drive the toothed ring (10) to rotate.

5. A gravity magnetic separation iron concentrate tailings beneficiation thickening tank according to claim 4, characterized in that, The power component includes: A driving gear (11), which is rotatably connected to the inner wall of the tank body (1). The driving gear (11) meshes with the toothed ring (10). A first motor (12), which is installed on one side of the tank body (1). The output end of the first motor (12) penetrates through the tank body (1) and is fixedly connected to the driving gear (11).

6. The beneficiation and concentration tank for gravity magnetic separation iron concentrate tailings according to claim 5, characterized in that, The buffer mechanism further includes: Multiple buffer columns (14), which are fixedly connected to the inner top wall of the tank body (1). The bottom ends of the multiple buffer columns (14) contact the circumferential surface of the tank body (1).

7. A gravity magnetic separation iron concentrate tailings beneficiation thickening tank according to claim 6, characterized in that, An unloading mechanism is provided at the discharge port, which can discharge the separated iron concentrate powder outside the tank body (1). The unloading mechanism includes: Support plates (15), two of the support plates (15) are provided, and both of the two support plates (15) are fixedly connected to the discharge port; Drive shafts (16), two of the drive shafts (16) are provided. One of the drive shafts (16) is rotatably connected to the opposite sides of the two partition plates (3), and the other drive shaft (16) is rotatably connected to the opposite surfaces of the two support plates (15); A transmission belt (17) is drivingly connected between the two drive shafts (16) for conveying the iron concentrate powder; A second motor (18) is installed on one side of one of the partition plates (3). The output end of the second motor (18) penetrates through the partition plate (3) and is fixedly connected to one of the drive shafts (16).

8. A gravity magnetic separation iron concentrate tailings beneficiation thickening tank according to claim 1, characterized in that, A flow splitting mechanism is fixedly connected to the discharge port. The flow splitting mechanism includes: A flow splitting groove (19) is fixedly connected inside the discharge port; Converging plates (20), two of the converging plates (20) are provided, and both of the two converging plates (20) are fixedly connected to the inner wall of the tank body (1). The flow splitting groove (19) is fixedly connected to the two converging plates (20).

9. A gravity magnetic separation iron concentrate tailings beneficiation thickening tank according to claim 3, characterized in that, Two sliding holes are formed in the tank body (1), and two sliding rods (8) are respectively slidably connected in the two sliding holes.

10. A gravity magnetic separation iron concentrate tailings beneficiation thickening tank according to claim 8, characterized in that, The flow splitting groove (19) is located directly below the roller (2).

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