Cobalt hydroxide preparation device and preparation process thereof

Abstract

The invention relates to the technical field of chemical product preparation, in particular to a cobalt hydroxide preparation device and a preparation process thereof.The cobalt hydroxide preparation device comprises a reaction kettle with a manhole and a manhole cover at the manhole, the manhole cover comprises a lower base and a fixing assembly, a support is hinged to the lower base, a connecting base is arranged on the support, and an upper cover is arranged on the connecting base; the upper cover is used for controlling opening and closing of the manhole; a sealing ring is arranged between the lower seat and the upper cover; the fixing assembly is used for fixedly connecting the lower base and the upper cover. The upper cover can rotate around a second axis, the direction of gravity borne by the connecting base and the upper cover integrally is coplanar with the second axis, when the manhole is opened through the upper cover, the lower end face of the upper cover and the upper end face of the lower base are kept parallel in a short time, and therefore the situation that a sealing ring is damaged due to uneven stress is avoided. The connecting base can rotate around the first axis, and the first axis is perpendicular to the second axis, so that the upper cover has freedom degrees in two rotating directions, and damage to the sealing ring is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of chemical product preparation, in particular to a cobalt hydroxide preparation device and a preparation process thereof. Background Art

[0002] As an important inorganic compound, cobalt hydroxide has shown wide application value in many industrial fields such as new energy batteries, catalysts, and magnetic materials due to its unique physical and chemical properties.

[0003] In the industrial production of cobalt hydroxide, the reactor, as a core piece of equipment, is responsible for important processes such as material mixing and reaction. Its performance and stability directly impact product quality and production efficiency. The reactor is typically equipped with a manhole cover. During production, the manhole cover facilitates the operator to discharge materials and monitor the reaction progress in real time. It also allows the operator to enter the reactor through the cover for inspection and repair in the event of a reactor malfunction or scheduled maintenance.

[0004] In the related art, Chinese patent CN221334089U discloses a reactor manhole cover structure, which is connected to the manhole mounting ring and the manhole cover body by providing a lower ear and an upper ear respectively. Then, a hole is drilled between the two upper ears and the two lower ears respectively, and the upper ears and the lower ears are connected with nuts and bolts slightly smaller than the holes to form a manhole cover. In this way, when the manhole cover is opened, the manhole cover body will also rotate around the bolt as the axis.

[0005] However, existing manhole covers also have some problems in actual use: during the opening and closing process of the manhole cover, due to the characteristics of its rotating structure, the movement trajectory and force mode of the part of the manhole cover close to the rotating shaft and the part away from the rotating shaft are different. This results in that during the closing process, the part close to the rotating shaft presses the sealing ring earlier and with greater force, while the part away from the rotating shaft presses the sealing ring relatively later and with less force; during long-term and high-frequency use, this uneven pressing state will cause uneven force on various parts of the sealing ring, excessive wear in some areas, and then damage; and once the sealing ring is damaged, the sealing of the reactor will be seriously affected, and outside air, impurities, etc. may enter the reactor, interfering with the normal reaction process of cobalt hydroxide, resulting in a decrease in product purity and an increase in impurity content, ultimately affecting the production quality of cobalt hydroxide. Summary of the Invention

[0006] Based on this, it is necessary to provide a cobalt hydroxide preparation device and a preparation process thereof to address the problem of poor production quality in the current cobalt hydroxide production process.

[0007] The above purpose is achieved through the following technical solutions: A cobalt hydroxide preparation device, the cobalt hydroxide preparation device comprising a reactor with a manhole formed on the reactor; a manhole cover provided at the manhole, the manhole cover comprising a lower seat and a fixing assembly, the lower seat being fixedly arranged on the reactor, a bracket being hingedly connected to the lower seat via a hinge shaft, a connecting seat being provided on the bracket, the connecting seat being capable of rotating about a first axis; an upper cover being provided on the connecting seat, the upper cover being capable of rotating about a second axis, the second axis being perpendicular to the first axis, the upper cover being configured to control the opening and closing of the manhole; when the manhole cover is closed, the direction of the gravity acting on the connecting seat and the upper cover as a whole is coplanar with the second axis; a sealing ring is provided between the lower seat and the upper cover; the fixing assembly is configured to enable the lower seat and the upper cover to be sealed and fixedly connected.

[0008] Furthermore, at least one pair of ear plates is provided on the lower seat, and the two ear plates of the same pair are arranged at intervals along the circumferential direction; the fixing assembly includes a locking bolt, and the locking bolts are hinged together between the two ear plates of the same pair, and a locking piece and a locking nut are sleeved on the locking bolt, and the locking nut is located above the locking piece and forms a threaded fit with the locking bolt; the locking piece can simultaneously form a stop fit with the locking nut and the upper cover.

[0009] Furthermore, a slot is provided on the upper cover; an inserting protrusion is provided on the locking member, and the inserting protrusion is fixedly inserted in the slot.

[0010] Furthermore, a handwheel is provided on the locking nut.

[0011] Furthermore, the manhole cover also includes a transmission assembly; a mounting seat is hinged on the hinge shaft; the bracket is arranged on the mounting seat, and under the action of the transmission assembly, when the upper cover opens the manhole, the bracket can drive the connecting seat and the upper cover to move in the direction close to the hinge shaft.

[0012] Furthermore, the transmission assembly includes a first gear, which is fixedly sleeved on the hinge shaft; a rack is provided on the connecting seat, and the rack extends in a radial direction; a second gear and a third gear are coaxially and synchronously rotated on the mounting seat, the second gear is engaged with the first gear, and the third gear is engaged with the rack.

[0013] Furthermore, the hinge axis is arranged horizontally.

[0014] Furthermore, the lower end surface of the upper cover is concave to form a spherical surface.

[0015] Furthermore, a guide ring is fixedly provided on the lower end surface of the upper cover, the axis of the guide ring coincides with the center of the lower spherical surface of the upper cover, and the guide ring has a structure with a larger upper end and a smaller lower end.

[0016] The present invention also provides a cobalt hydroxide preparation process, which uses a cobalt hydroxide preparation device. The cobalt hydroxide preparation process comprises the following steps: S1, adding the prepared cobalt salt solution and alkali solution into the reactor according to the preset ratio to react; S2. After the reaction is completed, the cobalt hydroxide generated by the reaction is taken out and the reactor is cleaned; S3. Open the manhole through the upper cover, and manually maintain the interior of the reactor through the manhole.

[0017] The beneficial effects of the present invention are: The present invention relates to a cobalt hydroxide preparation device and a preparation process thereof. By arranging an upper cover capable of rotating about a second axis, the direction of gravity exerted on a connecting seat and the upper cover as a whole is coplanar with the second axis. When a manhole is opened through the upper cover, the force characteristics and structural characteristics enable the lower end surface of the upper cover and the upper end surface of the lower seat to remain parallel for a short period of time, thereby avoiding damage to a sealing ring due to uneven force. Furthermore, by arranging the connecting seat capable of rotating about a first axis, with the first axis and the second axis being perpendicular, the upper cover has two additional degrees of freedom in rotation directions. During the process of closing the manhole through the upper cover, the side of the upper cover that first contacts the sealing ring pushes the upper cover in the opposite direction, so that the other side of the upper cover contacts the sealing ring as soon as possible, thereby reducing damage to the sealing ring due to uneven force. While facilitating extending the service life of the sealing ring, the sealing performance of the reactor can be guaranteed, and the production quality of cobalt hydroxide can be improved.

[0018] Furthermore, by setting up a transmission assembly and a mounting seat, and utilizing the structural characteristics that the mounting seat is hinged on the hinge shaft and the connecting seat is set on the mounting seat, when the manhole is opened through the upper cover, under the action of the transmission assembly, the bracket, the connecting seat and the upper cover as a whole can move in the direction close to the hinge shaft, thereby reducing the resistance arm, reducing the amount of power, and improving labor saving.

[0019] Furthermore, by setting the hinge axis horizontally, in the process of opening and closing the manhole through the upper cover, the direction of gravity on the bracket, connecting seat and upper cover as a whole is perpendicular to the hinge axis, thereby avoiding the problem of eccentric wear caused by the angle between the direction of gravity on the bracket, connecting seat and upper cover as a whole and the hinge axis, which is beneficial to extending the service life of the hinge axis.

[0020] Furthermore, by setting the lower end surface of the upper cover to be concave to form a spherical surface, during the reaction process of the reactor, its structural characteristics can be utilized to enable the floating gas and condensed liquid to flow back, thereby reducing corrosion to the sealing ring and ensuring its sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the three-dimensional structure of a cobalt hydroxide preparation device provided in an embodiment of the present invention; Figure 2 for Figure 1 A schematic diagram of the partially enlarged structure at Y in the middle; Figure 3 Schematic diagram of the three-dimensional structure of the cobalt hydroxide preparation device provided in an embodiment of the present invention when the manhole cover is closed Figure 1 ; Figure 4 for Figure 3 Middle AA section view; Figure 5 for Figure 4 Schematic diagram of the partially enlarged structure at Z in the middle; Figure 6 Schematic diagram of the three-dimensional structure of the cobalt hydroxide preparation device provided in an embodiment of the present invention when the manhole cover is closed Figure 2 ; Figure 7 for Figure 6 Middle BB section view; Figure 8 Schematic diagram of the three-dimensional structure of the cobalt hydroxide preparation device provided in an embodiment of the present invention when the manhole cover is opened Figure 1 ; Figure 9 Schematic diagram of the three-dimensional structure of the cobalt hydroxide preparation device provided in an embodiment of the present invention when the manhole cover is opened Figure 2 ; Figure 10 A schematic diagram of the exploded parts of a manhole cover of a cobalt hydroxide preparation device provided in an embodiment of the present invention.

[0022] in: 1. Reactor; 2. Manhole cover; 201. Lower seat; 2011. Ear plate; 202. Fixing assembly; 2021. Locking bolt; 2022. Locking piece; 2023. Locking nut; 20231. Handwheel; 2024. Slot; 2025. Insert protrusion; 203. Articulated shaft; 204. Bracket; 2041. Connecting column; 2042. Connecting piece; 205. Connecting seat; 2051. Fixing seat; 2052. Rotating rod; 2053. Slide; 206. Upper cover; 2061. Connecting rod; 2062. Guide ring; 207. Sealing ring; 208. Transmission assembly; 2081. First gear; 2082. Rack; 2083. Second gear; 2084. Third gear; 209. Mounting seat; 2091. Guide rod; 2092. Rotating shaft; 210. Fixing nut; 211. Slider. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0024] The serial numbers assigned to components herein, such as "first," "second," etc., are used solely to distinguish the objects being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" herein, unless otherwise specified, include both direct and indirect connections (couplings). In the description of the present invention, it should be understood that terms such as "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" indicate positions or relationships based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0025] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0026] Refer to the following Figures 1 to 10 The cobalt hydroxide preparation device provided in the embodiment of the present invention is described below. The device is particularly suitable for the preparation of cobalt hydroxide. Of course, it is also suitable for the preparation of other inorganic compounds.

[0027] Specifically, the cobalt hydroxide preparation device is configured to include a reactor 1, which is a cylindrical structure and is vertically arranged when installed; a manhole is opened on the top circumferential side wall of the reactor 1, which is connected to the interior of the reactor 1 and has a circular structure; a manhole cover 2 is provided at the manhole, and the manhole cover 2 is configured to control the opening and closing of the manhole, so as to facilitate the operator to discharge materials and monitor the reaction progress in real time. At the same time, when the reactor 1 fails or requires regular maintenance, the operator can enter the interior of the reactor 1 by opening the manhole cover 2 for inspection and maintenance.

[0028] In the field of existing hole covers used in reactors 1, the hole covers are generally connected to the reactor 1 in a single-sided hinged manner. During the opening and closing operations of the hole covers, the structural characteristics of the rotation around the hinge point lead to inherent defects in the mechanical movement: the motion trajectories of the particles on the side close to the hinge point and the side away from the hinge point show significant differences: the area close to the hinge point has a smaller rotation radius and a lower linear velocity, while the area away from the hinge point has a larger rotation radius and a higher linear velocity. This kinematic difference directly leads to the differentiation of dynamic characteristics - during the closing process, the sealing surface on the side close to the hinge point contacts the sealing ring first. At this time, the area has begun to apply a clamping force, while the sealing surface on the side away from the hinge point has not yet completed the fitting due to the movement lag, resulting in a time difference in the clamping action on both sides.

[0029] This non-uniform loading condition causes persistent fatigue damage to the sealing ring: the sealing ring near the hinge point is subjected to long-term overload pressure, causing the rubber material in this area to plastically deform and the elastic modulus to decrease; while the sealing ring away from the hinge point suffers from insufficient contact pressure, and microgaps are easily formed at the sealing interface. Under the action of high-frequency opening and closing cycles, the sealing ring will exhibit typical "eccentric wear failure" characteristics: cracks will appear on the lip near the hinge point, and wrinkles and deformation will occur on the sealing surface away from the hinge point, ultimately leading to an increase in the leakage rate of the sealing interface. This sealing failure will have a systemic impact on the cobalt hydroxide preparation process: when external air enters reactor 1, it will trigger an oxidation side reaction of cobalt ions, resulting in excessive trivalent cobalt content in the product; dust particles in the air will act as impurity cores and mix into the cobalt hydroxide crystals, reducing the purity of the product; at the same time, the condensate generated in the alkaline environment of reactor 1 will corrode the metal parts of the hole cover through the leakage channel, forming rust products, further contaminating the reaction system.

[0030] Based on this, in the cobalt hydroxide preparation device provided in the embodiment of the present invention, the manhole cover 2 is configured to include a lower seat 201, a hinge shaft 203, an upper cover 206 and a fixing assembly 202, wherein the lower seat 201 is a cylindrical structure with both upper and lower ends open, and is fixedly arranged on the top circumferential side wall of the reactor 1 and is coaxially arranged with the manhole; the hinge shaft 203 is fixed on the lower seat 201 during installation; the upper cover 206 is a disc-like structure, and is hinged to the lower seat 201 through the hinge shaft 203 during installation. When the upper cover 206 is away from the lower seat 201, the manhole cover 2 is in an open state, so that the reactor 1 is connected to the external environment through the manhole, which is convenient for operating personnel. The staff performs relevant operations; a sealing ring 207 is inserted on the top surface of the lower seat 201. When the upper cover 206 and the lower seat 201 are in contact with each other, the upper cover 206 and the lower seat 201 are coaxially arranged, the manhole cover 2 is in a closed state, and the fixing assembly 202 is configured to enable the lower seat 201 and the upper cover 206 to be sealed and fixedly connected. The sealing ring 207 undergoes elastic deformation, so that the reactor 1 is isolated from the external environment, thereby achieving sealing of the gap between the upper cover 206 and the lower seat 201, thereby ensuring the sealing of the reactor 1, preventing outside air, impurities, etc. from entering the reactor 1, avoiding interference with the normal reaction process of cobalt hydroxide, and ensuring the production quality of cobalt hydroxide.

[0031] The lower seat 201 is hinged with a bracket 204 through a hinge shaft 203. The bracket 204 is a bar-shaped structure, and the main body is mounted on the top of the upper cover 206. A connecting seat 205 is provided on the bracket 204. The upper and lower end faces of the connecting seat 205 are both spherical, and the center of the sphere of the connecting seat 205 coincides with the axis of the lower seat 201. The connecting seat 205 can rotate around the first axis. Two fixed seats 2051 are symmetrically provided on the top of the connecting seat 205. The fixed seats 2051 are of a C-shaped structure and are both arranged horizontally with the openings facing inward. 04, a rotating rod 2052 is horizontally inserted between the main parts of the bracket 204, and a threaded protrusion is provided on the circumferential side wall of the rotating rod 2052. The rotating rod 2052 is threadedly connected to the main part of the bracket 204 through the threaded protrusion during installation, and a locking protrusion is provided at the outer end of the rotating rod 2052. The locking protrusion is stopped on the main part of the bracket 204 during installation. Under the support of the two rotating rods 2052, the connecting seat 205 has a fixed position and can rotate around the axis of the rotating rod 2052 relative to the rotating rod 2052, and the first axis coincides with the axis of the rotating rod 2052.

[0032] The top end surface of the upper cover 206 is composed of an annular surface and an outer convex spherical surface, and the annular surface is located at the outer periphery of the spherical surface, and the axis of the annular surface coincides with the spherical center of the spherical surface, the spherical center of the spherical surface of the upper cover 206 coincides with the spherical center of the connecting seat 205, the spherical surface of the upper cover 206 coincides with the lower spherical annular surface of the connecting seat 205 when installed, and can rotate around the second axis, a sliding groove 2053 is formed in the upper spherical annular surface of the connecting seat 205, the sliding groove 2053 has a circular arc structure, and the center of the circular arc structure coincides with the spherical center of the connecting seat 205 and is located at the fixed seat 2051, a connecting rod 2061 is fixedly arranged on the top spherical surface of the upper cover 206, the extending direction of the connecting rod 2061 passes through the spherical center of the top spherical surface of the upper cover 206, and the connecting rod 2061 passes through the sliding groove 2053 when installed and can slide along the sliding groove 2053, the connecting rod 2061 has a square structure, and the upper cover 206 cannot rotate around the connecting rod 2061 under the limitation of the square structure, so as to avoid dislocation of the upper cover 206 and the lower seat 201; a fixed nut 210 and a sliding block 211 are sleeved on the connecting rod 2061, the fixed nut 210 is located above the sliding block 211 and is in threaded connection with the connecting rod 2061 and can be stopped on the sliding block 211, the sliding block 211 has an annular structure, and the lower annular surface of the sliding block 211 is a spherical surface and coincides with the upper spherical annular surface of the connecting seat 205, so that the upper cover 206 can be connected to the connecting seat 205; the lower annular surface of the sliding block 211 and the upper spherical annular surface of the connecting seat 205 are in smooth contact, so as to facilitate reducing the resistance of the upper cover 206 when rotating around the second axis; the second axis coincides with the center of the sliding groove 2053, is parallel to the annular surface of the upper cover 206, and is perpendicular to the first axis, so that the upper cover 206 has double rotation degrees of freedom around the first axis and the second axis. When the manhole is closed, if one side of the upper cover 206 first contacts the sealing ring 207, the reaction force generated by the sealing ring 207 will form a moment through the contact point, forcing the upper cover 206 to rotate around the second axis and pushing the other side to be synchronously fitted. This dynamic adjustment process can control the difference in contact time and the difference in contact pressure between the two sides within a predetermined range, and fundamentally eliminates the bias problem of the traditional single-axis structure. At the same time, when the thickness of the sealing ring 207 is not uniform after long-term use, the multi-degree-of-freedom upper cover 206 can still well adapt to the thickness of the sealing ring 207 at different positions, thereby facilitating to ensure the uniformity of the sealing effect.

[0033] During use, the direction of the gravity of the connecting seat 205 and the upper cover 206 as a whole is coplanar with the second axis, and during the process of rotating the upper cover 206 around the second axis when opening the manhole through the upper cover 206, the component G1 of the gravity G along the direction of the second axis and the rotating axis moment are offset, and the component G2 perpendicular to the second axis is converted into a parallel movement trend through the sliding groove 2053 guide structure, so that the parallelism between the lower end surface of the upper cover 206 and the upper end surface of the lower seat 201 is maintained within a predetermined range during opening, and the single-side tearing of the sealing ring 207 caused by the inclination angle is avoided.

[0034] The fixing assembly 202 can be configured to include a first boss, a second boss, a bolt and a nut, wherein the first boss is fixedly provided on the outer peripheral wall of the lower seat 201, and the number of the first boss can be multiple and evenly arranged along the circumference; the second boss is fixedly provided on the outer peripheral wall of the upper cover 206, and the number of the second boss can be multiple and evenly arranged along the circumference, and the second boss and the first boss are correspondingly provided; mounting holes are provided on the first boss and the second boss, and the bolts pass through the mounting holes on the first boss and the second boss respectively during installation, and are fixedly connected by nuts, thereby fixing the upper cover 206 and the lower seat 201 together through the sealing ring 207.

[0035] In other embodiments, at least one pair of ear plates 2011 is provided on the lower seat 201, and the two ear plates 2011 of the same pair are arranged at intervals along the circumferential direction; the fixing assembly 202 can also be configured to include a locking bolt 2021, the locking bolt 2021 is a T-shaped structure, and when installed, the large end is rotated and inserted into the two ear plates 2011 of the same pair at the same time to form a hinged fit, the small end is suspended, and a threaded protrusion is provided on the end circumferential side wall of the small end; a locking piece 2022 and a locking nut 2023 are sleeved on the locking bolt 2021, the locking piece 2022 is located below the locking nut 2023, and is a ring-like structure, and a third boss is provided on the outer surface of the locking piece 2022, and the third boss can form a stop fit with the upper annular surface of the upper cover 206; the locking nut 2023 forms a threaded fit with the locking bolt 2021 through the threaded protrusion. When the upper cover 206 is closed, the upper cover 206 and the lower seat 201 are first brought into contact with each other, and then the locking bolt 2021 is rotated so that the small end of the locking bolt 2021 is set upward, and then the locking nut 2023 is rotated, and the locking nut 2023 moves downward synchronously, and then is pressed against the locking piece 2022, and at the same time, the third boss is pressed against the upper ring surface of the upper cover 206. As the locking nut 2023 continues to rotate, the locking nut 2023 synchronously presses the upper cover 206 and the lower seat 201 through the locking piece 2022 and the third boss, and the sealing ring 207 is elastically deformed synchronously, so that the reactor 1 is isolated from the external environment, thereby achieving the sealing of the gap between the upper cover 206 and the lower seat 201; when the upper cover 206 needs to be opened, the above process is repeated in reverse, and the third boss and the upper cover 206 can be disengaged, and then the upper cover 206 and the lower seat 201 can be driven away from each other.

[0036] In a further embodiment, in order to further improve the locking stability of the locking member 2022, a slot 2024 is provided on the upper annular surface of the upper cover 206; an insertion protrusion 2025 is provided on the locking member 2022, and the insertion protrusion 2025 is provided on the lower surface of the third boss and is fixedly inserted in the slot 2024 during installation. In this way, through the clamping connection between the protrusion 2025 and the slot 2024, a limiting structure in three-dimensional space is formed: when the locking member 2022 is pressed down by the locking nut 2023, the protrusion 2025 is axially embedded in the slot 2024, and its cross-sectional shape (such as rectangle, trapezoid, etc.) forms a circumferential stop with the inner wall of the slot 2024. This structure can effectively suppress the relative displacement of the upper cover 206 and the lower seat 201 in the radial and tangential directions - the radial displacement is limited by the rigid contact between the side wall of the protrusion 2025 and the wall of the slot 2024, and the tangential rotation generates torque resistance due to the profile matching of the protrusion 2025 and the slot 2024, thereby expanding the linear clamping force of the traditional threaded connection into a composite force system including axial pressure, radial constraint force and tangential anti-torsion moment.

[0037] At the same time, in traditional locking structures, the preload force of threaded connections is primarily transmitted through axial compression, which can easily lead to uneven circumferential pressure due to thread machining errors. However, the snap-fitting connection between the protrusion 2025 and the slot 2024 forms multiple circumferential positioning pivot points (the number of pivot points increases accordingly if multiple sets of protrusions 2025 and slots 2024 are provided). These pivot points are coupled with the elastic deformation of the sealing ring 207, limiting the displacement deviation of various circumferential parts of the upper cover 206 to a relatively small range when axial pressure is applied. Specifically, when the clearance between the protrusion 2025 and the slot 2024 on one side is small, that pivot point will preferentially bear some of the preload force, prompting the upper cover 206 to automatically adjust its posture through mechanical feedback, ultimately achieving a uniform pressure distribution on the surface of the sealing ring 207, which plays a key role in improving sealing reliability.

[0038] In a further embodiment, when there are multiple pairs of ear plates 2011 , there are correspondingly multiple insertion protrusions 2025 , and the slot 2024 can be configured as an annular structure and coaxially arranged with the upper annular surface of the upper cover 206 .

[0039] In other embodiments, in order to improve the convenience when rotating the locking nut 2023, a hand wheel 20231 is fixedly provided on the top of the locking nut 2023. In this way, when the locking nut 2023 needs to be rotated, the locking nut 2023 can be driven to rotate directly by rotating the hand wheel 20231.

[0040] In other embodiments, while the tilt angle of the upper cover 206 remains constant, the distance between its center of gravity and the hinge axis 203 is greater, resulting in a longer resistance arm. Based on the lever equilibrium condition F1*L1=F2*L2, the rotation of the upper cover 206 about the hinge axis 203 can be considered a lever system—the hinge axis 203 serves as the fulcrum, and the combined weight G of the bracket 204, connector 205, and upper cover 206 serves as the resistance. The vertical distance from the line of action to the fulcrum (i.e., resistance arm L2) is determined by the position of the center of gravity. As the center of gravity moves away from the hinge axis 203, L2 increases. If the power arm L1 (i.e., the distance from the operator's force application point to the fulcrum) remains unchanged, then, according to the principle of leverage, the required force F1 increases in direct proportion to L2. Specifically, the resistance torque M=G*L2 generated by gravity increases as L2 is extended. To balance the resistance torque, the power F1 needs to satisfy F1=GL2 / L1, which causes the operator to apply greater force to drive the upper cover 206 to flip, which is directly manifested as the effort of the opening process.

[0041] Based on this, in the cobalt hydroxide preparation device provided in an embodiment of the present invention, the manhole cover 2 is configured to further include a transmission assembly 208; a mounting seat 209 is hinged on the hinge shaft 203; the bracket 204 is arranged on the mounting seat 209, and under the action of the transmission assembly 208, when the upper cover 206 opens the manhole, the bracket 204 can drive the connecting seat 205 and the upper cover 206 to move in a direction close to the hinge shaft 203, thereby reducing the resistance arm, reducing the amount of power, and improving labor saving.

[0042] Specifically, the transmission assembly 208 is configured to include a first gear 2081, which is fixedly sleeved on the hinge shaft 203; a connecting column 2041 is vertically and fixedly provided on the side wall of the bracket 204 close to the hinge shaft 203, and two connecting pieces 2042 are fixedly sleeved on the connecting column 2041. The lower ends of the two connecting pieces 2042 are abutted and fixedly connected by a bolt and nut assembly. The upper ends of the two connecting pieces 2042 are spaced apart, and a rack 2082 is inserted between the two. The rack 2082 The guide rod 2091 is vertically and fixedly provided on the side wall of the mounting seat 209 away from the hinge shaft 203. The guide rod 2091 is parallel to the rack 2082 and passes through the connecting column 2041 during installation and is located below the rack 2082, so that the connecting column 2041 can be supported and radially guided. The guide rod 2091 is a square-shaped structure, thereby limiting the The bracket 204 has a rotational freedom; a rotation axis 2092 is rotatably provided on the mounting seat 209, the rotation axis 2092 is arranged parallel to the hinge axis 203, and is located above the hinge axis 203, and a second gear 2083 and a third gear 2084 are fixedly sleeved on the rotation axis 2092, wherein the second gear 2083 is engaged with the first gear 2081, and the third gear 2084 is engaged with the rack 2082. When the upper cover 206 is opened, the mounting seat 209 rotates around the hinge axis 203, synchronously driving the rotation axis 209 2 and the second gear 2083 rotate. Under the meshing of the second gear 2083 and the first gear 2081, the second gear 2083 synchronously drives the third gear 2084 to rotate through the rotating shaft 2092. Under the meshing of the third gear 2084 and the rack 2082, the rack 2082 synchronously drives the bracket 204, the connecting seat 205 and the upper cover 206 to move as a whole toward the hinge shaft 203 through the connecting piece 2042 and the connecting column 2041, thereby reducing the resistance arm, reducing the amount of power, and improving labor saving.

[0043] In other embodiments, the conventionally designed hinge shaft 203 is often tilted. In this case, the gravity direction (vertically downward) of the motion assembly composed of the bracket 204, the connecting seat 205 and the upper cover 206 forms a non-zero angle with the axis of the hinge shaft 203. This configuration will induce a significant eccentric wear mechanism during mechanical movement: when the hinge shaft 203 is tilted, the gravity G of the motion assembly can be decomposed into a component force G1 along the axis of the hinge shaft 203 and a component force G2 perpendicular to the axis of the hinge shaft 203, wherein G2 will produce a force on the hinge shaft 203. The yaw moment M=G2*L (L is the vertical distance from the line of action of gravity to the hinge shaft 203). When the moving component rotates around the hinge shaft 203, this torque drives the moving component to generate a yaw tendency around the plane perpendicular to the hinge shaft 203, causing the lower end of the hinge shaft 203 to be subjected to continuous radial extrusion force. This yaw tendency is not evenly distributed - during the rotation process, the movement trajectory of the center of gravity of the moving component forms a conical surface, causing the contact stress between the lower end of the hinge shaft 203 and the lower seat 201 to always be biased inward, forming an extrusion load in a fixed direction.

[0044] The contact interface between articulated shaft 203 and lower seat 201 can be considered an elastic contact system. Under the action of the yaw moment, the contact stress σin on the inner side of the lower end of articulated shaft 203 is significantly greater than σout. This difference is determined by the bending stress formula in material mechanics: σ = (M*y) / I (y is the distance from the cross section to the neutral axis, and I is the cross section moment of inertia). During long-term, high-frequency rotation, the inner contact area will undergo plastic deformation due to continuous overload, fatigue hardening of the surface metal, and the formation of microcracks. Meanwhile, the outer area suffers from insufficient stress, making it difficult to achieve uniform wear compensation. This asymmetric stress distribution causes the cross section of the lower end of articulated shaft 203 to gradually wear from a circular shape to an elliptical shape, ultimately destroying the coaxiality of the revolving pair and leading to a series of problems such as increased vibration and seal failure.

[0045] Based on this, in the cobalt hydroxide preparation device provided in the embodiment of the present invention, the hinge shaft 203 is set to be horizontal. With this setting, when the direction of gravity is perpendicular to the hinge shaft 203, the component of the gravity vector along the axis of the hinge shaft 203 is zero, avoiding the generation of a torque that causes the hinge shaft 203 to yaw. This ensures that the contact interface between the hinge shaft 203 and the lower seat 201 is evenly stressed, eliminating the radial offset load caused by the gravity component, and thus avoiding the asymmetric distribution of contact stress. This fundamentally solves the problem of eccentric wear caused by the angle between gravity and the hinge shaft 203 in traditional tilting settings, effectively extending the service life of the hinge shaft 203.

[0046] In other embodiments, when gases (such as ammonia and water vapor) generated in the alkaline environment of the reactor 1 impact the manhole cover 2 upward, they cool and condense on the lower surface of the cover, forming alkaline condensate. This condensate, flowing along the sealing interface between the upper cover 206 and the lower seat 201, chemically corrodes the sealing ring 207. The alkaline medium penetrates the gaps between the rubber molecular chains, destroying the polymer bonds, causing the elastic modulus of the sealing ring 207 to decrease and crack, leading to failure. Simultaneously, carbonate crystals formed by the reaction of gas molecules (such as CO2) with the alkaline solution induce crystallization stress on the surface of the sealing ring 207, exacerbating microscopic damage to the sealing surface. Furthermore, the turbulence caused by the gas impact accelerates the delamination of the lubricating film on the surface of the sealing ring 207, exposing the sealing interface directly to the corrosive medium and further shortening the service life of the sealing ring 207.

[0047] Based on this, in the cobalt hydroxide preparation device provided in an embodiment of the present invention, the lower end surface of the upper cover 206 is concave to form a spherical surface. This configuration, on the one hand, reduces material usage and component mass through the curved thin-walled structure, thereby reducing the inertial resistance moment of rotation around the hinge shaft 203 and achieving labor-saving opening and closing operations. On the other hand, when the rising gas and condensate in the reactor 1 impact the spherical surface, due to the geometric guidance characteristics of the curved surface, the gas-liquid mixture will converge and flow back toward the center along the tangent direction of the sphere, avoiding flow along the sealing interface. This can effectively block direct contact between the corrosive medium and the sealing ring 207, reduce swelling corrosion and crystallization stress damage to the rubber material caused by the alkaline condensate, and ensure the reliability of the sealing system from a structural level.

[0048] In a further embodiment, to further enhance the reflux effect, a guide ring 2062 is fixedly mounted on the lower end surface of the upper cover 206. The axis of the guide ring 2062 coincides with the center of the lower spherical surface of the upper cover 206, and the guide ring 2062 is a structure with a larger upper end and a smaller lower end. This configuration synergistically enhances the reflux effect through geometric configuration: when the rising gas-liquid mixture within the reactor 1 impacts the lower spherical surface, the curved surface guides the medium toward the center, while the frustum-shaped profile of the guide ring 2062 further exerts radial contraction constraints on the converging fluid. Utilizing the wall adhesion effect of the fluid flowing along the conical surface, the gas-liquid mixture is forced to accelerate along the conical surface of the guide ring 2062 toward the center of the reactor 1. This composite guiding mechanism effectively blocks the fluid's migration path along the lower end edge of the upper cover 206 toward the sealing interface, preventing alkaline condensate from contacting the sealing ring 207. This structurally eliminates the potential risk of medium corrosion on the sealing surface and further enhances the durability of the sealing system.

[0049] In a further embodiment, the lower annular surface of guide ring 2062 is rounded, thereby utilizing surface geometry to optimize the convergence and dripping mechanism of condensate. Specifically, the rounded corner configuration reduces the sudden change in surface tension of the condensate at the edge of the annular surface, causing the dispersed liquid film to gather into droplets at the rounded corner due to the minimized surface energy. When the gravity of the droplets exceeds the surface adsorption force, they drip into the reactor 1 along the tangent direction of the rounded corner, avoiding adhesion to the surface of guide ring 2062 in the form of a thin film. At the same time, the rounded corner reduces the turbulence of the rising gas flowing through the annular surface. When the gas impacts the rounded corner, the streamlines have a smooth transition in curvature, reducing the generation of eddies and the secondary entrainment effect on the droplets. This effectively prevents the condensate from being carried back to the surface of the upper cover 206 by the gas, further reducing the probability of contact between the condensate and the sealing ring 207, and enhancing the corrosion protection effect.

[0050] In other embodiments, there are two slide grooves 2053, which are symmetrically arranged about the connecting seat 205; there are two connecting rods 2061, which are respectively inserted into the slide grooves 2053, and the connecting rods 2061 are round rod structures; each connecting rod 2061 is sleeved with a fixing nut 210 and a slider 211; with the cooperation of the two sets of slide grooves 2053 and the connecting rods 2061, the connection stability between the upper cover 206 and the connecting seat 205 can be improved, and the rotation of the upper cover 206 along the second axis can be restricted.

[0051] In other embodiments, in order to enhance the sealing effect of the reactor 1 , a plurality of sealing rings 207 are provided on the top surface of the lower seat 201 . The plurality of sealing rings 207 have different diameters and are coaxially arranged.

[0052] Exemplarily, there may be two sealing rings 207 , which are coaxially arranged.

[0053] In other embodiments, in order to reduce the resistance encountered by the upper cover 206 when it rotates around the second axis, it can also be arranged that a plurality of freely rolling balls are inserted on the lower annular surface of the slider 211, and the balls simultaneously roll and abut against the upper spherical annular surface of the connecting seat 205, thereby changing the friction form between the slider 211 and the connecting seat 205 from sliding friction to rolling friction, thereby reducing the resistance encountered by the upper cover 206 when it rotates around the second axis by reducing the friction between the slider 211 and the connecting seat 205.

[0054] Another embodiment of the present invention further provides a process for preparing cobalt hydroxide, using a cobalt hydroxide preparation device. The process for preparing cobalt hydroxide comprises the following steps: S1, adding the prepared cobalt salt solution and alkali solution into the reactor 1 according to the preset ratio to react; Specifically, the cobalt salt solution can be set to a cobalt chloride solution; and the alkali solution can be set to a sodium hydroxide solution.

[0055] More specifically, these raw materials need to undergo pretreatment, such as dissolution, filtration, and acid adjustment, to ensure that their purity and concentration meet the reaction requirements.

[0056] More specifically, the pH of the mixed solution of the cobalt salt solution and the alkali solution is typically controlled between 10.20 and 11.60 to promote the formation of cobalt hydroxide. Furthermore, to promote uniform oxidation of the cobalt hydroxide and improve the consistency of its particle size distribution, an oxidizing gas (such as ozone) may be added to the reactor 1. Furthermore, to prevent oxidation of the cobalt hydroxide, nitrogen is typically introduced during the reaction for protection.

[0057] S2. After the reaction is completed, the cobalt hydroxide generated by the reaction is taken out and the reactor 1 is cleaned; Specifically, after the reaction is complete, the resulting cobalt hydroxide precipitate is initially separated using a filter press. The slurry after filtration is then washed to remove residual sodium salts or other impurities to ensure product purity. The washing process is typically performed at a stable pH between 12 and 13. The washed slurry then enters an aging tank for further aging to improve the product's crystallinity and stability.

[0058] More specifically, the aged cobalt hydroxide is dried by a centrifuge, and then the moisture is removed by spray drying or flash drying to finally obtain the finished cobalt hydroxide.

[0059] S3. Open the manhole through the upper cover 206 and perform maintenance on the interior of the reactor 1 manually through the manhole.

[0060] Specifically, in the process of opening the upper cover 206, by setting the upper cover 206 to be able to rotate around the second axis, the direction of the gravity exerted on the connecting seat 205 and the upper cover 206 as a whole is coplanar with the second axis. When the manhole is opened by the upper cover 206, the force characteristics and structural characteristics make the lower end surface of the upper cover 206 and the upper end surface of the lower seat 201 remain parallel in a short time, thereby avoiding damage to the sealing ring 207 due to uneven force; and by setting the connecting seat 205 to be able to rotate around the first axis, and the first axis and the second axis are perpendicular, the upper cover 206 has two additional degrees of freedom in two rotation directions. In the process of closing the manhole by the upper cover 206, the side of the upper cover 206 and the sealing ring 207 that contacts first will push the upper cover 206 in the opposite direction, so that the other side of the upper cover 206 contacts the sealing ring 207 as soon as possible, thereby reducing the damage to the sealing ring 207 caused by uneven force, while helping to extend the service life of the sealing ring 207, it can not only ensure the sealing performance of the reactor 1, but also improve the production quality of cobalt hydroxide.

[0061] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] The above-described embodiments merely illustrate several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that variations and modifications are possible without departing from the scope of the present invention, and such variations and modifications are fully within the scope of protection of the present invention.

Claims

1. A cobalt hydroxide preparation device, characterized in that, The cobalt hydroxide preparation device includes a reactor with a manhole formed on it; a manhole cover is provided at the manhole, and the manhole cover includes a lower seat and a fixing assembly, the lower seat is fixedly provided on the reactor, a bracket is hingedly connected to the lower seat via a hinge shaft, a connecting seat is provided on the bracket, and the connecting seat can rotate around a first axis; an upper cover is provided on the connecting seat, and the upper cover can rotate around a second axis, the second axis is perpendicular to the first axis, and the upper cover is configured to control the opening and closing of the manhole; when the manhole cover is closed, the direction of the gravity acting on the connecting seat and the upper cover as a whole is coplanar with the second axis; a sealing ring is provided between the lower seat and the upper cover; and the fixing assembly is configured to enable the lower seat and the upper cover to be sealed and fixedly connected.

2. The cobalt hydroxide preparation device according to claim 1, wherein At least one pair of ear plates is provided on the lower seat, and the two ear plates of the same pair are arranged at intervals along the circumferential direction; the fixing assembly includes a locking bolt, and the locking bolts are hinged together between the two ear plates of the same pair, and a locking piece and a locking nut are sleeved on the locking bolt, and the locking nut is located above the locking piece and forms a threaded fit with the locking bolt; the locking piece can simultaneously form a stop fit with the locking nut and the upper cover.

3. cobalt hydroxide preparation device according to claim 2, is characterized in that, The upper cover is provided with a slot; the locking piece is provided with an inserting protrusion, and the inserting protrusion is fixedly inserted in the slot.

4. cobalt hydroxide preparation device according to claim 2, is characterized in that, A hand wheel is provided on the locking nut.

5. The cobalt hydroxide preparation device according to claim 1, wherein The manhole cover also includes a transmission assembly; a mounting seat is hinged on the hinge shaft; the bracket is arranged on the mounting seat, and under the action of the transmission assembly, when the upper cover opens the manhole, the bracket can drive the connecting seat and the upper cover to move in a direction close to the hinge shaft.

6. The cobalt hydroxide preparation device according to claim 5, wherein The transmission assembly includes a first gear, which is fixedly sleeved on the hinge shaft; a rack is provided on the connecting seat, and the rack extends in a radial direction; a second gear and a third gear are coaxially and synchronously rotated on the mounting seat, the second gear is meshed with the first gear, and the third gear is meshed with the rack.

7. The cobalt hydroxide preparation device according to claim 1, wherein The hinge shaft is arranged horizontally.

8. The cobalt hydroxide preparation device according to claim 1, wherein The lower end surface of the upper cover is concave to form a spherical surface.

9. The cobalt hydroxide preparation device according to claim 8, wherein A guide ring is fixedly provided on the lower end surface of the upper cover, the axis of the guide ring coincides with the center of the lower spherical surface of the upper cover, and the guide ring has a structure with a larger upper end and a smaller lower end.

10. A process for preparing cobalt hydroxide, characterized in that: Using the cobalt hydroxide preparation device according to any one of claims 1 to 9, the cobalt hydroxide preparation process comprises the following steps: S1, adding the prepared cobalt salt solution and alkali solution into the reactor according to the preset ratio to react; S2. After the reaction is completed, the cobalt hydroxide generated by the reaction is taken out and the reactor is cleaned; S3. Open the manhole through the upper cover, and manually maintain the interior of the reactor through the manhole.

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