An automatic blending device for coal silos in coal-fired power plants

Abstract

This invention discloses an automatic blending device for coal-fired power plant silos, comprising a fixed component including a silo top, silo walls, and silo bottom; a movable component disposed within the fixed component, including a fixed ring, a movable plate, and a fixed plate; and a sealing component disposed on top of the movable component, including a first stop block and a second stop block. With the cooperation of the fixed, movable, and sealing components, this invention can divide the interior of the coal silo into areas of different sizes and corresponding coal feeding speeds according to required proportions, and the proportions of the zones and the coal feeding speed can be freely adjusted.

Description

Technical Field

[0001] This invention relates to the field of coal blending technology, and in particular to an automatic blending device for coal silos in coal-fired power plants. Background Technology

[0002] Currently, coal blending for thermal power plants is carried out by bucket wheel excavators collecting coal in proportion from different coal types in enclosed coal yards and then transporting it to silos (standby silos). When the coal in the operating silos is exhausted, the system will switch to the standby silos for coal loading.

[0003] Current coal blending methods require fuel operators to be on standby 24 hours a day to blend and feed coal, resulting in low work efficiency. At the same time, the coal blending work cannot be precisely mixed. Therefore, there is a need for a coal bunker that can internally separate different areas, freely adjust the proportion of the distribution areas, and determine the corresponding coal feeding speed for each area as needed. Summary of the Invention

[0004] In view of the problems existing in the prior art, the present invention is proposed.

[0005] Therefore, the problem to be solved by this invention is how to divide the interior of the coal bunker into areas of different sizes according to the required proportions and the corresponding coal feeding speeds.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an automatic blending device for coal silos in coal-fired power plants, which includes a fixed component, a movable component and a closed component.

[0007] As a preferred embodiment of the automatic coal blending device for coal-fired power plant silos according to the present invention, the fixed component includes a silo top, a silo wall, and a silo bottom, wherein the silo top is disposed at the top of the silo wall, and the silo bottom is disposed at the bottom of the silo wall;

[0008] A movable component, disposed within the fixed component, includes a fixed ring, a movable plate, and a fixed plate. The fixed ring is disposed on the inner wall of the bottom of the bin wall, the movable plate is disposed inside the fixed ring, and the fixed plate is disposed on the side of the movable plate; and...

[0009] A sealing component, located on top of the movable component, includes a first stop block and a second stop block. The first stop block is located between the fixing ring and the bin wall, and the second stop block is located on the side of the first stop block.

[0010] As a preferred embodiment of the automatic blending device for coal-fired power plant silos according to the present invention, the fixing component further includes a partition and a hinge ring. The partition is perpendicular to the top of the silo bottom, one side is attached to the inner wall of the silo, and the other side is rotatably connected to the hinge ring. The hinge ring is coaxial with the silo wall and is disposed at the top and bottom of the partition.

[0011] As a preferred embodiment of the automatic blending device for coal-fired power plant silos according to the present invention, the fixed component further includes a central shaft and an inclined bottom. The central shaft is located at the top center of the inclined bottom, and the inclined bottom is located at the top center of the silo bottom. The hinge ring and the central shaft are rotatably connected.

[0012] In a preferred embodiment of the automatic blending device for coal-fired power plant silos according to the present invention, the movable component further includes a transmission component, which is disposed at the bottom of the inclined base. The transmission component includes a transmission shaft, a large hydraulic wall, a medium hydraulic wall, a small hydraulic wall, and a hydraulic cone. The bottom of the transmission shaft is rotatably connected to the center of the bottom surface of the inclined base. The large hydraulic wall is disposed on one side of the bottom of the transmission shaft. The medium hydraulic wall is sleeved inside the large hydraulic wall. The small hydraulic wall is sleeved inside the medium hydraulic wall. The hydraulic cone is sleeved on the top of one side of the small hydraulic wall.

[0013] As a preferred embodiment of the automatic blending device for coal-fired power plant silos according to the present invention, the movable component further includes a limiting member, which is disposed at the bottom of the side of the partition that is in contact with the silo wall. The limiting member includes a limiting spring, a limiting post, and a limiting block. The limiting spring is disposed inside the partition. The limiting post is disposed at the bottom of the limiting spring. The limiting block is disposed on one side of the bottom of the limiting post.

[0014] As a preferred embodiment of the automatic blending device for coal-fired power plant silos described in this invention, the top of the silo is provided with an inlet and the bottom of the silo is provided with an outlet.

[0015] As a preferred embodiment of the automatic blending device for coal silos in coal-fired power plants according to the present invention, wherein: the partition plate is provided with a hinge groove and a limiting groove, the hinge groove is provided on the side of the partition plate that is in contact with the central shaft, and the limiting groove is provided on the bottom of the side of the partition plate that is in contact with the silo wall;

[0016] The hinge slot and the hinge ring cooperate, and the top of the limiting slot and the top of the limiting spring are fixedly connected.

[0017] As a preferred embodiment of the automatic blending device for coal-fired power plant silos described in this invention, a transmission groove is provided at the center of the inclined bottom surface, and the transmission groove and the transmission shaft are rotatably connected.

[0018] As a preferred embodiment of the automatic blending device for coal-fired power plant silos according to the present invention, the fixed ring includes a top ring, a middle ring, a bottom ring, and a limiting plate; the top ring is disposed on the top of the middle ring; the middle ring is disposed on the top of the bottom ring; and the limiting plate is uniformly arranged around the periphery of the bottom ring.

[0019] As a preferred embodiment of the automatic blending device for coal silos in coal-fired power plants according to the present invention, wherein: the top ring and the bottom ring are uniformly surrounded by movable plate holes, the fixed plate is disposed on both sides of the movable plate holes, and the movable plate and the movable plate holes are directly opposite each other;

[0020] The movable plate and the fixed plate are disposed between the top ring and the bottom ring. The bottom of the fixed plate is provided with a straight groove, and the top of the movable plate is provided with a straight ridge. The straight groove and the straight ridge point to the central axis, and the straight groove and the straight ridge cooperate with each other.

[0021] The bottom of the movable plate is provided with a curved groove, which cooperates with the top of the hydraulic cone.

[0022] The beneficial effects of this invention are as follows: with the cooperation of fixed components, movable components and closed components, our invention can divide the interior of the coal bunker into areas of different sizes and corresponding coal feeding speeds according to the required proportions, and the proportions of the partitions and the coal feeding speeds can be freely adjusted. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0024] Figure 1 This is a cross-sectional view of the automatic blending device for coal silos in a coal-fired power plant.

[0025] Figure 2 This is a diagram showing the internal structure of an automatic blending device for coal silos in a coal-fired power plant.

[0026] Figure 3 Exploded view of the moving components of the automatic blending device for coal silos in a coal-fired power plant.

[0027] Figure 4 This is a structural diagram of the transmission components of an automatic blending device for coal silos in a coal-fired power plant.

[0028] Figure 5 This is a structural diagram of the limit component of the automatic blending device for coal silos in a coal-fired power plant.

[0029] Figure 6 Another perspective structural diagram of the moving components of the automatic blending device for coal silos in coal-fired power plants.

[0030] Figure 7 A top view of the moving components of the automatic blending device for coal silos in a coal-fired power plant. Detailed Implementation

[0031] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0032] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0033] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single embodiment or an embodiment selectively excluded from other embodiments.

[0034] Example 1

[0035] Reference Figures 1-3 This is the first embodiment of the present invention, which provides an automatic blending device for coal-fired power plant coal silos. The automatic blending device for coal-fired power plant coal silos includes...

[0036] Specifically, the fixed component 100 includes a silo top 101, a silo wall 102, and a silo bottom 103. The silo top 101 is located at the top of the silo wall 102, and the silo bottom 103 is located at the bottom of the silo wall 102.

[0037] The fixed component 100 is used to hold coal. The top of the bin 101 and the bin wall 102 together form the coal bin. The bottom of the bin 103 is used to house the power components and provide a coal drop point. The top of the bin 101 is connected to the end of the bucket wheel conveyor, and the bottom of the bin 103 is connected to the beginning of the conveyor belt.

[0038] The movable component 200 is disposed inside the fixed component 100 and includes a fixed ring 201, a movable plate 202 and a fixed plate 203. The fixed ring 201 is disposed on the inner bottom wall of the bin wall 102, the movable plate 202 is disposed inside the fixed ring 201, and the fixed plate 203 is disposed on the side of the movable plate 202.

[0039] The active component 200 is used to adjust the proportion and number of differentiating zones inside the coal bunker, and also to unload coal.

[0040] The closing component 300 is located on top of the movable component 200 and includes a first stop 301 and a second stop 302. The first stop 301 is located between the fixing ring 201 and the bin wall 102, and the second stop 302 is located on the side of the first stop 301.

[0041] The closing component 300 is used to block the necessary gaps between the movable component 200 and the fixed component 100. After determining the proportion and number of partitions, the number and position of the first stop block 301 and the second stop block 302 are determined.

[0042] Specifically, the fixing component 100 also includes a partition 104 and a hinge ring 107. The partition 104 is perpendicular to the top of the bin bottom 103, one side is attached to the inner wall of the bin wall 102, and the other side is rotatably connected to the hinge ring 107. The hinge ring 107 is coaxial with the bin wall 102 and is located at the top and bottom of the partition 104.

[0043] The partition 104 is used to divide the internal space of the coal bunker. The number of partitions 104 is used to determine the number of partitions, and the included angle between the partitions 104 is used to determine the space occupancy of each partition.

[0044] The number of dividers 104 is the same as the number of hinge rings 107. Each divider 104 is fixedly connected to only one set of hinge rings 107 and rotates with other sets of hinge rings 107.

[0045] Specifically, the fixing component 100 also includes a central shaft 105 and a sloping bottom 106. The central shaft 105 is located at the top center of the sloping bottom 106, and the sloping bottom 106 is located at the top center of the bottom of the compartment 103. The hinge ring 107 is rotatably connected to the central shaft 105.

[0046] The partition 104 is connected to the central shaft 105 via a corresponding hinge ring 107, allowing the partition 104 to rotate and thus adjust the included angle between the partitions 104. The sloping bottom 106 is used to prevent coal blocks from accumulating in the middle of the coal bunker.

[0047] Specifically, the active component 200 also includes a transmission component 204, which is disposed at the bottom of the inclined base 106. The transmission component 204 includes a transmission shaft 204a, a hydraulic large wall 204b, a hydraulic middle wall 204c, a hydraulic small wall 204d, and a hydraulic cone 204e. The bottom of the transmission shaft 204a is rotatably connected to the center of the bottom surface of the inclined base 106. The hydraulic large wall 204b is disposed on one side of the bottom of the transmission shaft 204a. The hydraulic middle wall 204c is sleeved inside the hydraulic large wall 204b. The hydraulic small wall 204d is sleeved inside the hydraulic middle wall 204c. The hydraulic cone 204e is sleeved on the top of one side of the hydraulic small wall 204d.

[0048] The transmission component 204 is powered by an external motor to drive the movable plate 202 to move horizontally, thereby unloading coal. It can also drive the partition plate 104 to rotate, adjusting the internal partition ratio of the coal bunker.

[0049] The hydraulic large wall 204b, hydraulic middle wall 204c, and hydraulic small wall 204d can translate axially along the hydraulic walls to adjust the position of the hydraulic cone 204e. The hydraulic cone 204e, near the drive shaft 204a, engages with the movable plate 202, and the hydraulic cone 204e, away from the drive shaft 204a, engages with the limiting member 205. The hydraulic cone 204e can translate axially perpendicular to the hydraulic walls.

[0050] Specifically, the active component 200 also includes a limiting component 205, which is disposed at the bottom of the side of the partition 104 that is in contact with the bin wall 102. The limiting component 205 includes a limiting spring 205a, a limiting post 205b, and a limiting block 205c. The limiting spring 205a is disposed inside the partition 104. The limiting post 205b is disposed at the bottom of the limiting spring 205a. The limiting block 205c is disposed on one side of the bottom of the limiting post 205b.

[0051] The bottom of the limit block 205c is provided with a conical groove, which is used to cooperate with the hydraulic cone 204e.

[0052] The limiting component 205 is used to cooperate with the partition 104 and the transmission component 204, so that the transmission component 204 can drive the partition 104 to rotate and adjust the internal partition ratio of the coal bunker.

[0053] When in use, the allocation ratio and quantity of the coal bunker are determined according to the needs, and the corresponding number of partitions 104 and first block 301 and second block 302 are determined. The number of second block 302 is the same as that of partition 104, and the number of first block 301 is determined according to the minimum included angle between the two partitions 104.

[0054] When in use, first use an external motor to extend the three hydraulic walls of the transmission component 204, so that the hydraulic cone 204e and the cone groove of the limit block 205c can cooperate. In this way, the position of the single partition 104 can be adjusted by rotating the transmission component 204.

[0055] Next, fill the space between the retaining ring 201 and the bin wall 102 with the sealing component 300, while noting that there is only one second stop block 302 between every two partitions 104;

[0056] Next, different coal blocks can be accepted. The top of the silo 101 can be equipped with a dedicated conveyor belt or a rotating pipe leading to each section to fill the section with coal until each section is filled with enough coal.

[0057] Next, shorten the transmission component 204 so that the hydraulic cone 204e and the movable plate 202 cooperate. In this way, the passively rotating hydraulic cone 204e can drive the movable plate 202 to move radially along the fixed ring 201, so that the coal block can fall from the top side of the bin bottom 103 through the gap between the fixed ring 201 and the movable plate 202.

[0058] Example 2

[0059] Reference Figures 1-7 This is the second embodiment of the present invention, which is based on the previous embodiment.

[0060] Specifically, the top of the silo 101 is provided with an inlet H1, and the bottom of the silo 103 is provided with an outlet H2.

[0061] The feed port H1 can be used to transport coal blocks into the coal bunker, and the discharge port H2 is used to unload coal.

[0062] Specifically, the partition 104 is provided with a hinge slot K1 and a limiting slot K2. The hinge slot K1 is located on the side of the partition 104 that is in contact with the central shaft 105, and the limiting slot K2 is located at the bottom of the side of the partition 104 that is in contact with the bin wall 102.

[0063] The hinge slot K1 and the hinge ring 107 are fitted together, and the top of the limiting slot K2 is fixedly connected to the top of the limiting spring 205a.

[0064] The partition 104 has the same number of hinge slots K1 and hinge rings 107, but the partition 104 is only fixedly connected to the outer wall of one set of hinge rings 107 and rotates with the other sets of hinge rings 107.

[0065] Specifically, a transmission groove K3 is provided at the center of the bottom surface of the sloping bottom 106, and the transmission groove K3 is rotatably connected to the transmission shaft 204a.

[0066] An external motor is provided on the bottom side of the sloping bottom 106 to provide power to the transmission component 204.

[0067] Transmission groove K3 is used to position transmission shaft 204a.

[0068] Specifically, the fixing ring 201 includes a top ring 201a, a middle ring 201b, a bottom ring 201c, and a limiting plate 201d; the top ring 201a is disposed on the top of the middle ring 201b; the middle ring 201b is disposed on the top of the bottom ring 201c; and the limiting plate 201d is evenly arranged around the periphery of the bottom ring 201c.

[0069] The number of limiting plates 201d is the same as the number of first stop blocks 301 plus second stop blocks 302. The gap between the two limiting plates 201d is used to fit the limiting block 205c of the limiting member 205 at the bottom of the partition 104.

[0070] Specifically, the top ring 201a and the bottom ring 201c are evenly surrounded by flap holes H3, the fixed plate 203 is set on both sides of the flap holes H3, and the movable plate 202 is directly opposite the flap holes H3.

[0071] The hinge hole H3 is used to drop coal when it is not blocked by the movable plate 202.

[0072] The movable plate 202 and the fixed plate 203 are disposed between the top ring 201a and the bottom ring 201c. The bottom of the fixed plate 203 is provided with a straight groove 203a, and the top of the movable plate 202 is provided with a straight ridge 202a. The straight groove 203a and the straight ridge 202a point towards the axis of the central axis 105, and the straight groove 203a and the straight ridge 202a cooperate.

[0073] The movable plate 202 can be moved radially along the top ring 201a. When the movable plate 202 is close to the center of the top ring 201a, the hole H3 of the movable plate is exposed, and the coal block can fall down.

[0074] The bottom of the movable plate 202 is provided with a curved groove 202b, which is engaged with the top of the hydraulic cone 204e.

[0075] When the hydraulic cone 204e rotates, the movable plate 202 moves closer to the center of the top ring 201a through the curved groove 202b, and then moves away from the center of the top ring 201a, thus causing the coal block to fall.

[0076] In use, the three hydraulic walls of the transmission component 204 are first extended by an external motor, so that the hydraulic cone 204e and the cone groove of the limiting block 205c are engaged. In this way, the rotation of the transmission component 204 can adjust the position of the single partition 104, and the hydraulic cone 204e falls into the gap between the limiting plates 201d, so that the limiting block 205c fills the gap between the limiting plates 201d, preventing the partition 104 from moving again.

[0077] Next, fill the space between the retaining ring 201 and the bin wall 102 with the sealing component 300, while noting that there is only one second stop block 302 between every two partitions 104;

[0078] Next, different coal blocks can be accepted. The top of the silo 101 can be equipped with a dedicated conveyor belt or a rotating pipe leading to each section to fill the section with coal until each section is filled with enough coal.

[0079] Next, shorten the transmission component 204 so that the hydraulic cone 204e and the curved groove 202b of the movable plate 202 cooperate. In this way, the passively rotating hydraulic cone 204e can drive the movable plate 202 to move radially along the fixed ring 201. After the hydraulic cone 204e completes one curved groove 202b, it can move the movable plate 202 back and forth once, so that the movable plate hole H3 is exposed once, allowing the coal block to fall from the top side of the bin bottom 103 through the gap between the fixed ring 201 and the movable plate 202.

[0080] During coal feeding, the spatial proportions of each zone in the coal bunker are different, but the spatial proportions of each zone in the coal bunker are the same as the proportion of the number of flap holes H3. In other words, as long as the transmission component 204 rotates at a constant speed, the coal feeding time proportions of each zone in the coal bunker are the same. Therefore, as long as the notes corresponding to the mixed coal are determined at the beginning and the spatial proportions in the coal bunker are allocated according to this proportion, there is no need to adjust the speed of the transmission component 204 in the corresponding zone during subsequent coal feeding.

[0081] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An automatic blending device for coal silos in coal-fired power plants, characterized in that: The utility model relates to a kind of automatic sealing and opening device for warehouse, including, Fixed component (100), including warehouse top (101), warehouse wall (102) and warehouse bottom (103), the warehouse top (101) is set on the top of the warehouse wall (102), the warehouse bottom (103) is set on the bottom of the warehouse wall (102); Movable component (200) is set inside the fixed component (100), including fixed ring (201), movable plate (202) and fixed plate (203), the fixed ring (201) is set on the inner wall of the bottom of the warehouse wall (102), the movable plate (202) is set inside the fixed ring (201), the fixed plate (203) is set on the side of the movable plate (202);And, Closed component (300) is set on the top of the movable component (200), including No. 301 and No. 302, the No. 301 is set between the fixed ring (201) and the warehouse wall (102), the No. 302 is set on the side of the No. 301; The fixed component (100) further includes partition (104) and loose-leaf ring (107), the partition (104) is perpendicular to the top of the warehouse bottom (103), one side and the inner wall of the warehouse wall (102) are attached, the other side and the loose-leaf ring (107) are rotationally connected, the loose-leaf ring (107) and the warehouse wall (102) are coaxial, the loose-leaf ring (107) is set on the top and bottom of the partition (104); The fixed component (100) further includes middle shaft (105) and inclined bottom (106), the middle shaft (105) is set on the center top of the inclined bottom (106), the inclined bottom (106) is set on the top center of the warehouse bottom (103), the loose-leaf ring (107) and the middle shaft (105) are rotationally connected; The movable component (200) further includes transmission member (204), the transmission member (204) is set on the bottom of the inclined bottom (106), the transmission member (204) includes transmission shaft (204a), hydraulic big wall (204b), hydraulic medium wall (204c), hydraulic small wall (204d) and hydraulic cone (204e);The bottom of the transmission shaft (204a) and the center of the bottom surface of the inclined bottom (106) are rotationally connected;The hydraulic big wall (204b) is set on the bottom of the transmission shaft (204a) one side;The hydraulic medium wall (204c) is sleeved in the hydraulic big wall (204b);The hydraulic small wall (204d) is sleeved in the hydraulic medium wall (204c);The hydraulic cone (204e) is sleeved on the top of the one side of the hydraulic small wall (204d); The activity assembly (200) further comprises a limiting piece (205), which is arranged at the bottom of the side of the partition plate (104) abutting the bin wall (102), and the limiting piece (205) comprises a limiting spring (205a), a limiting column (205b) and a limiting block (205c); the limiting spring (205a) is arranged inside the partition plate (104); the limiting column (205b) is arranged at the bottom of the limiting spring (205a); and the limiting block (205c) is arranged at one side of the bottom of the limiting column (205b). The position of the hydraulic cone (204e) can be adjusted between the hydraulic large wall (204b), the hydraulic middle wall (204c) and the hydraulic small wall (204d), the hydraulic cone (204e) is matched with the movable plate (202) near the transmission shaft (204a), and the hydraulic cone (204e) is matched with the limiting piece (205) away from the transmission shaft (204a).

2. The automatic blending device for the coal silo of the coal-fired power plant according to claim 1, characterized in that: The top of the bin top (101) is provided with a feeding port (H1), and the bottom of the bin bottom (103) is provided with a discharging port (H2).

3. The automatic blending device for the coal silo of the coal-fired power plant according to claim 2, characterized in that: The partition plate (104) is provided with a hinge slot (K1) and a limiting slot (K2), the hinge slot (K1) is arranged on the side of the partition plate (104) abutting the middle shaft (105), and the limiting slot (K2) is arranged at the bottom of the side of the partition plate (104) abutting the bin wall (102); The hinge slot (K1) is matched with the hinge ring (107), and the top of the limiting slot (K2) is fixedly connected with the top of the limiting spring (205a).

4. The automatic blending device for the coal silo of the coal-fired power plant according to claim 3, characterized in that: The center of the bottom surface of the inclined bottom (106) is provided with a transmission slot (K3), and the transmission slot (K3) is rotationally connected with the transmission shaft (204a).

5. The automatic blending device for the coal silo of the coal-fired power plant according to claim 3 or 4, characterized in that: The fixed ring (201) comprises a top ring (201a), a middle ring (201b), a bottom ring (201c) and a limiting plate (201d); the top ring (201a) is arranged at the top of the middle ring (201b); the middle ring (201b) is arranged at the top of the bottom ring (201c); and the bottom ring (201c) is uniformly surrounded by the limiting plate (201d) around the periphery.

6. The automatic blending device for the coal silo of the coal-fired power plant according to claim 5, characterized in that: The top ring (201a) and the bottom ring (201c) are uniformly surrounded by hinge holes (H3) around the periphery, the fixed plate (203) is arranged on both sides of the hinge hole (H3), and the movable plate (202) is opposite to the hinge hole (H3). The movable plate (202) and the fixed plate (203) are arranged between the top ring (201a) and the bottom ring (201c), the bottom of the fixed plate (203) is provided with a straight groove (203a), the top of the movable plate (202) is provided with a straight edge (202a), the straight groove (203a) and the straight edge (202a) are directed to the axis of the central shaft (105), and the straight groove (203a) and the straight edge (202a) are matched; the bottom of the movable plate (202) is provided with a curved groove (202b), and the curved groove (202b) is matched with the top of the hydraulic cone (204e).

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