Magnesium oxide-based ceramic insulating tube isostatic pressing equipment and high-pressure compacting method

Abstract

The invention discloses magnesium oxide-based ceramic insulation tube isostatic pressing forming equipment and a high-pressure densification method, and relates to the technical field of ceramic molding.Four templates are movably installed in a pressurizing box, and the four templates can synchronously move after pressurization in the pressurizing box by means of guiding and coordination of a movement maintaining mechanism; the same extrusion force is stably and synchronously applied to raw materials in the forming cavity in the peripheral direction, isostatic pressing forming of the ceramic insulating tube is achieved, meanwhile, the material returning opening is formed in the upper portion of the forming cavity, the column core is matched with the column core to ascend and descend under the control of the first lifting mechanism, the ceramic insulating tube obtained after isostatic pressing forming can be separated from the forming cavity upwards, and the forming efficiency is improved. And a worker can conveniently demould and take materials, continuous production is carried out, and the isostatic pressing production efficiency of the ceramic insulating tube is improved to a certain extent.

Description

Technical Field

[0001] The invention relates to the technical field of ceramic forming, and in particular to isostatic pressing equipment for magnesium oxide-based ceramic insulating tubes and a high-pressure densification method. Background Art

[0002] Ceramic insulating tubes are widely used in the electronics, power, aerospace and other industries due to their excellent insulation properties, high temperature resistance and good chemical stability. With the growing demand for ceramic insulating tubes in various industries, the optimization and innovation of their production technology has become the key to the development of the industry. In the existing technology, isostatic pressing equipment is usually used to realize the processing and production of ceramic insulating tubes.

[0003] At present, when ceramic insulating tubes are produced by isostatic pressing, the commonly used method is to first fill the raw materials into a special isostatic pressing mold. After the raw materials are filled, the isostatic pressing mold is placed in a pressurized box for isostatic pressing production. During the raw material filling process, careful manual operation is required to ensure that the raw materials are evenly distributed in the mold, which requires high proficiency and concentration of the operator. Any carelessness may lead to uneven filling of raw materials, affecting the quality of the product after isostatic pressing. Manual filling, mold loading, placement, and subsequent removal and demolding make the entire production process cumbersome. Each link takes a certain amount of time, which lengthens the overall production cycle and leads to low production efficiency. In addition, a large amount of manual filling of raw materials and disassembly of special molds are used, and the production cost is high, making it difficult to form continuous and efficient isostatic pressing production of ceramic insulating tubes.

[0004] To this end, an isostatic pressing device and a high-pressure densification method for magnesium oxide-based ceramic insulating tubes are proposed to solve some problems existing in the above-mentioned prior art. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art in the isostatic pressing production process of ceramic insulating tubes, such as manual loading of raw materials and disassembly of molds, which leads to cumbersome molding production process and inconvenience in demolding and material removal, affecting production efficiency and production cost, and to propose a magnesium oxide-based ceramic insulating tube isostatic pressing molding equipment and a high-pressure densification method.

[0006] In order to solve the problems existing in the prior art, the present invention adopts the following technical solutions: A static pressing device for isostatic pressing of magnesium oxide-based ceramic insulating tubes, comprising a pressurizing box, in which a vertically arranged column core is slidably installed, four templates evenly distributed around the column core are installed in the pressurizing box, and two adjacent templates are slidably connected, and the upper and lower ends of the templates are respectively slidably connected to the upper and lower inner end walls of the pressurizing box, and a plurality of templates are arranged on a side close to the column core in a counterclockwise direction as an arc wall, a material withdrawal port corresponding to the column core is provided on the top of the pressurizing box, and a cover plate is sealed in the material withdrawal port, an oil pipe is connected to the outer end wall of the pressurizing box, an outer frame is provided below the pressurizing box, and an inner frame is installed in the outer frame, the lower end of the column core is vertically inserted in the inner frame, and a first lifting mechanism for driving the inner frame to move up and down is installed in the outer frame.

[0007] Preferably, a movable holding mechanism is installed in the pressurized box, and the movable holding mechanism includes a first slide rail horizontally fixed on the end wall of each template away from the column core, a first slide sleeve and a second slide sleeve are slidably installed on the first slide rail, a second slide rail vertically arranged with the first slide rail is horizontally fixed on the first slide sleeve, and a third slide sleeve fixedly connected to the inner end wall of the pressurized box is slidably sleeved on the second slide rail.

[0008] Preferably, a gear column is rotatably installed in the pressurization box, and the front and rear sides of the gear column are meshed and connected with transverse racks symmetrically arranged on the central axis, and the left and right sides of the gear column are meshed and connected with longitudinal racks symmetrically arranged on the central axis, the transverse rack and the longitudinal rack are in different planes, and connecting rods are connected to the transverse rack and the longitudinal rack, the front transverse rack is fixedly connected to the second sliding sleeve on the left first slide rail through the connecting rod, the rear transverse rack is fixedly connected to the second sliding sleeve on the right first slide rail through the connecting rod, the left longitudinal rack is fixedly connected to the second sliding sleeve on the rear first slide rail through the connecting rod, and the right longitudinal rack is fixedly connected to the second sliding sleeve on the front first slide rail through the connecting rod.

[0009] Preferably, a vertically arranged feed channel is provided in the column core, a feed port connected to the feed channel is provided above the column core, a feed hose connected to the inside of the feed channel is installed at the bottom of the column core, and a second lifting mechanism for driving the column core to move up and down is installed in the inner frame.

[0010] Preferably, two cover plates are provided, a flip driving mechanism is connected between the two cover plates and the top of the pressurized box, a groove adapted to the column core is opened on the cover plate, the first lifting mechanism includes a first gear rod vertically fixed on the outer end wall of the inner frame, a first gear meshing with the first gear rod is rotatably installed in the outer frame, a first motor is fixed in the outer frame, and the drive shaft of the first motor is transmission-connected to the first gear.

[0011] Preferably, the feed port is opened on the cylindrical surface at the upper end of the feed channel, and the thickness of the cover plate is set to be twice the inner diameter of the feed port opening.

[0012] Preferably, the second lifting mechanism includes a sleeve fixedly installed in the inner frame, the column core is slidably inserted in the sleeve, the cylindrical surface of the column core is provided with evenly distributed teeth grooves from bottom to top, a second gear meshing with the teeth grooves is rotatably installed in the sleeve, a second motor is fixed in the inner frame, and the drive shaft of the second motor is transmission connected to the second gear.

[0013] Preferably, a gear disk is provided on the outer movable sleeve of the column core, a vertically arranged slide groove is opened on the cylindrical surface of the column core, a slider adapted to the slide groove is fixed in the gear disk, a third gear meshing with the gear disk is rotatably installed in the inner frame, a first bevel tooth is fixed on the driving shaft of the second motor, a second bevel tooth meshing with the first bevel tooth is fixed above the third gear, an adapter is rotatably connected to the bottom end of the column core, and the adapter is fixedly connected to the feed hose, a tooth groove is circumferentially opened on the cylindrical surface of the column core, and the depth of the slide groove is set to 1 / 2 of the tooth groove depth.

[0014] Preferably, the flipping drive mechanism includes two rotating shafts rotatably installed on the top of the pressurized box, and two cover plates are rotatably installed on the top of the pressurized box through corresponding rotating shafts. A fourth gear is fixed at the end of the rotating shaft, and a second gear rod meshing with the fourth gear is slidably installed on the top of the pressurized box. A hydraulic push rod arranged parallel to the second gear rod is fixed on the top of the pressurized box, and the telescopic end of the hydraulic push rod is fixedly connected to the second gear rod.

[0015] Preferably, a high-voltage densification method for a magnesium oxide-based ceramic insulating tube comprises the following steps: S1. With the help of the second lifting mechanism, the column core is driven to move from bottom to top in the molding cavity formed by a plurality of templates and arc-shaped walls, and the magnesium oxide-based ceramic raw material is evenly filled in the molding cavity from bottom to top through the connection between the feeding channel and the feeding port and the rotation of the column core; S2. After the top of the column core rises to the top of the pressurized box, the left and right cover plates are controlled by the flip drive mechanism to be closed in the material withdrawal port, and the material supply port is blocked; S3. The feeding operation of the magnesium oxide-based ceramic raw material is continuously maintained in the feeding channel. At the contact position between the feeding port and the groove, a lateral extrusion force is applied to the cover plate, and the restriction in the flip driving mechanism is coordinated to ensure the sealing stability at the return port; S4. Hydraulic oil is continuously injected into the pressurized box through the oil pipe. The high pressure after hydraulic injection drives the four templates to move and approach each other. With the coordinated guidance of the moving holding mechanism, the four templates move synchronously, and a balanced and stable extrusion pressure is applied synchronously from all sides, and finally the molding cavity is reduced to a cylindrical structure, completing the high-pressure dense extrusion molding of the magnesium oxide-based ceramic insulating tube.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, four templates are movably installed in the pressurized box, and with the help of the guidance and coordination of the mobile holding mechanism, the four templates can be moved synchronously after the pressurization in the pressurized box, and the same extrusion force is stably and synchronously applied to the raw materials in the molding cavity from all directions, so as to realize the isostatic pressing of the ceramic insulating tube. At the same time, by opening the material withdrawal port above the molding cavity, the column core is lifted and moved under the control of the first lifting mechanism, so that the isostatically pressed ceramic insulating tube can be separated from the molding cavity upward, which is convenient for the staff to demold and take out the material, and carry out continuous production, thereby improving the efficiency of the isostatic pressing production of the ceramic insulating tube to a certain extent; 2. In the present invention, the movement of the four templates is coordinated by a moving holding mechanism, and the meshing of the two transverse racks and the gear column, and the meshing of the two longitudinal racks and the gear column, in cooperation with the sliding connection between the two adjacent templates, so that the movement of the four templates in the front, back, left and right is synchronous, and the movement amplitude is consistent, so that the raw material in the molding cavity is subjected to balanced and stable isostatic extrusion molding. After being pressurized, the four templates move synchronously to the center of the molding cavity, and the high-pressure densification molding extrusion of the ceramic insulating tube can be stably realized; 3. In the present invention, by opening the feed channel in the column core and opening the feed port above the column core, the meshing drive of the second gear and the tooth groove in the second lifting mechanism can be used to drive the column core to move from bottom to top in the molding cavity during the raw material supply. The sliding adaptation of the slide groove and the slider can make the column core rotate during the driving process of the second lifting mechanism, so that the ceramic raw material can be more evenly transported to the molding cavity, which can improve the density and stability of the device when producing ceramic insulating tubes by isostatic pressing to a certain extent. 4. In the present invention, the cover plate is symmetrically arranged in the material return port, so that the material return port can be opened and closed conveniently. With the lifting and lowering control of the column core, the ceramic insulating tube can be taken out of the molding cavity after static pressing, which is beneficial to further improve the convenience of demolding and material taking. At the same time, by setting the thickness of the cover plate to be larger than the inner diameter of the feed port, the continuous raw material supply operation in the feed channel during the molding process will exert a lateral extrusion force on the cover plate at the contact position between the feed port and the groove. With the restriction in the flip drive mechanism, the sealing stability at the material return port can be effectively guaranteed, which is beneficial to improve the sealing of the molding cavity after the material return port is closed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 It is a front cross-sectional view of the present invention; Figure 2 A perspective view of the present invention; Figure 3 It is a three-dimensional diagram of the template of the present invention when it is not pressurized; Figure 4 It is a top cross-sectional view of the pressurized box of the present invention when it is not pressurized; Figure 5 A three-dimensional diagram of the template when pressurized according to the present invention; Figure 6 It is a top cross-sectional view of the pressurized box of the present invention when pressurized; Figure 7 It is a three-dimensional diagram of the cover plate, the groove and the flip driving mechanism of the present invention; Figure 8 It is a three-dimensional diagram of the structure on the inner frame of the present invention; Fig. 9 is a top cross-sectional view of the toothed disc and the third gear of the present invention; Fig.10 It is a three-dimensional diagram of the second lifting mechanism of the present invention.

[0018] Serial number in the picture: 1. Pressurized box; 101. Column core; 102. Template; 103. Curved wall; 104. Material withdrawal port; 105. Cover plate; 106. Groove; 107. Oil pipe; 2. first slide rail; 201. first slide sleeve; 202. second slide sleeve; 203. second slide rail; 204. third slide sleeve; 205. gear column; 206. transverse rack; 207. longitudinal rack; 3. Feed channel; 301. Feed port; 302. Feed hose; 303. Adapter; 4. outer frame; 401. inner frame; 402. first gear rod; 403. first gear; 404. first motor; 5. Sleeve; 501. Tooth groove; 502. Second gear; 503. Second motor; 504. Tooth plate; 505. Slide groove; 506. Slider; 507. Third gear; 508. First bevel gear; 509. Second bevel gear; 6. Rotating shaft; 601. Fourth gear; 602. Second gear rod; 603. Hydraulic push rod. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0020] Embodiment: This embodiment provides a magnesium oxide-based ceramic insulation tube isostatic pressing device, see Figure 1 - Fig.10Specifically, it includes a pressurizing box 1, in which a vertically arranged column core 101 is slidably installed, four templates 102 are installed in the pressurizing box 1 and are evenly distributed around the column core 101, and two adjacent templates 102 are slidably connected, and the upper and lower ends of the templates 102 are respectively slidably connected to the upper and lower inner end walls of the pressurizing box 1, and a side of many templates 102 close to the column core 101 in a counterclockwise direction is set as an arc wall 103, and a material withdrawal port 104 corresponding to the column core 101 is opened on the top of the pressurizing box 1, and a cover plate 105 is sealed in the material withdrawal port 104, an oil pipe 107 is connected to the outer end wall of the pressurizing box 1, an outer frame 4 is arranged at the bottom of the pressurizing box 1, and an inner frame 401 is installed in the outer frame 4, and the lower end of the column core 101 is vertically inserted in the inner frame 401.

[0021] When the device is in use, four surrounding templates 102 and the arc-shaped wall 103 arranged on the end wall thereof cooperate with the inner end walls on the upper and lower sides of the pressurized box 1 to form a relatively independent molding cavity, which is used for the molding of magnesium oxide-based ceramic insulating tubes. The column core 101 is located at the center of the molding cavity. In the initial state, the internal space of the molding cavity is larger than the volume of the ceramic insulating tube after actual molding, which makes the four surrounding templates 102 in the initial state away from each other, and the arc-shaped wall 103 is set to an arc of 1 / 4 circle. When the four templates 102 are squeezed and synchronously approach the center of the molding cavity, the four arc-shaped walls 103 will eventually cooperate with each other to form a complete cylindrical space, and the magnesium oxide-based ceramic raw material is filled in the molding cavity. In the process of shrinking the molding cavity to a cylindrical shape, the magnesium oxide-based ceramic raw material is extruded to make it densified and molded into a ceramic insulating tube.

[0022] A vertically arranged feeding channel 3 is provided in the column core 101, a feeding port 301 connected with the feeding channel 3 is provided on the top of the column core 101, a feeding hose 302 connected with the inside of the feeding channel 3 is installed at the bottom of the column core 101, a second lifting mechanism for driving the column core 101 to move up and down is installed in the inner frame 401, the second lifting mechanism includes a sleeve 5 fixedly installed in the inner frame 401, the column core 101 is slidably inserted in the sleeve 5, and uniformly distributed tooth grooves 501 are provided on the cylindrical surface of the column core 101 from bottom to top, a second gear 502 meshing with the tooth groove 501 is rotatably installed in the sleeve 5, a second motor 503 is fixed in the inner frame 401, and the driving shaft of the second motor 503 is transmission-connected to the second gear 502.

[0023] When the device is used to produce ceramic insulating tubes, the oil pipe 107 is externally connected to a hydraulic oil pressurizing device, and the feed hose 302 is externally connected to a magnesium oxide-based ceramic raw material supply device. The magnesium oxide-based ceramic raw material is composed of high-purity magnesium oxide powder, mixed with strontium titanate powder, yttrium oxide, silicon carbide, aluminum oxide and other materials. Among them, yttrium oxide is used as a flux to effectively reduce the sintering temperature and improve the thermal shock resistance of the magnesium oxide-based ceramic insulating tube after sintering. Silicon carbide and aluminum oxide are used as reinforcing agents, which are evenly dispersed in the magnesium oxide matrix, and can improve the toughness and wear resistance of the ceramic insulating tube after sintering. During the production and processing, the raw material supply device continuously transports the raw material to the feed channel 3 through the feed hose 302, and then sprays it out through the feed port 301 to fill the raw material in the molding cavity.

[0024] In the initial state, the top of the column core 101 is at the lower position in the molding cavity. During the raw material supply process, driven by the second lifting mechanism, along with the continuous supply of raw materials, the column core 101 will rise from the bottom to the top in the molding cavity. In this state, the second motor 503 is powered on and started, driving the second gear 502 connected to its drive shaft to rotate, and then with the help of the engagement of the second gear 502 and the tooth groove 501, the column core 101 is driven to move upward. After the raw material supply is completed, the top of the column core 101 passes through the return port 104 and is above the top of the pressurizing box 1. The upper cylindrical surface of the column core 101 is smooth, and the tooth groove 501 is only opened on the lower cylindrical surface of the column core 101. During the isostatic pressing process of the ceramic insulating tube, the tooth groove 501 will not enter the molding cavity to ensure the smoothness and stability of the inner wall of the ceramic insulating tube after molding.

[0025] In the specific implementation process, Figure 7 As shown, there are two cover plates 105, and a flip driving mechanism is connected between the two cover plates 105 and the top of the pressurizing box 1. A groove 106 adapted to the column core 101 is opened on the cover plate 105, and the feed port 301 is opened on the cylindrical surface of the upper end of the feed channel 3. The thickness of the cover plate 105 is set to twice the inner diameter of the opening of the feed port 301. The flip driving mechanism includes two rotating shafts 6 rotatably installed on the top of the pressurizing box 1. The two cover plates 105 are rotatably installed on the top of the pressurizing box 1 through the corresponding rotating shafts 6, and a fourth gear 601 is fixed at the end of the rotating shaft 6. A second gear rod 602 meshing with the fourth gear 601 is slidably installed on the top of the pressurizing box 1, and a hydraulic push rod 603 arranged parallel to the second gear rod 602 is fixed on the top of the pressurizing box 1, and the telescopic end of the hydraulic push rod 603 is fixedly connected to the second gear rod 602.

[0026] When the device is used, the cover plate 105 can be controlled to rotate through the flip drive mechanism to realize the opening and closing control of the material withdrawal port 104. After the hydraulic push rod 603 is powered on, its telescopic end can move left and right. The second gear rod 602 is controlled to move left and right through the movement of the telescopic end of the hydraulic push rod 603. With the meshing of the second gear rod 602 and the fourth gear 601, the fourth gear 601 drives the rotating shaft 6 to rotate, thereby realizing the flipping control of the left and right cover plates 105. The fourth gear 601 is fixed at the front and rear ends of each rotating shaft 6, and the outer side of each fourth gear 601 is meshed with the second gear rod 602. Through the meshing control of the fourth gear 601 and the second gear rod 602 on the front and rear sides, the stability of the flipping and opening and closing control of the left and right cover plates 105 can be effectively guaranteed. When the raw material is filled in the molding cavity, the flipping drive mechanism is started to control the left and right cover plates 105 to rotate synchronously relative to each other, fill the material return port 104, and block the material return port 104. With the help of the groove 106 on the left and right cover plates 105 that is adapted to the outer end wall of the column core 101, the upper end of the column core 101 can be clamped in the groove 106 on the left and right cover plates 105, so as to achieve stable maintenance of the upper end of the column core 101.

[0027] When the ceramic insulating tube is isostatically pressed in the molding cavity, the supply operation of the magnesium oxide-based ceramic raw material will be continuously maintained in the feeding channel 3. At the contact position between the feeding port 301 and the groove 106, a lateral extrusion force will be applied to the cover plate 105. Combined with the restrictions in the flipping drive mechanism, the sealing stability at the return port 104 can be effectively guaranteed.

[0028] In the specific implementation process, Figure 3 - Figure 6As shown, a moving and holding mechanism is installed in the pressurized box 1, and the moving and holding mechanism includes a first slide rail 2 horizontally fixed on the end wall of each template 102 away from the column core 101, a first slide sleeve 201 and a second slide sleeve 202 are slidably installed on the first slide rail 2, a second slide rail 203 vertically arranged with the first slide rail 2 is horizontally fixed on the first slide sleeve 201, and a third slide sleeve 204 fixedly connected to the inner end wall of the pressurized box 1 is slidably sleeved on the second slide rail 203, a gear column 205 is rotatably installed in the pressurized box 1, and the front and rear sides of the gear column 205 are meshed and connected with a transverse rack 206 symmetrically arranged on the central axis, and the left and right sides of the gear column 205 are The two sides are meshed and connected with longitudinal racks 207 which are symmetrically arranged along the central axis. The transverse rack 206 and the longitudinal rack 207 are in different planes. Connecting rods are connected to the transverse rack 206 and the longitudinal rack 207. The front transverse rack 206 is fixedly connected to the second sleeve 202 on the left first slide rail 2 through a connecting rod, the rear transverse rack 206 is fixedly connected to the second sleeve 202 on the right first slide rail 2 through a connecting rod, the left longitudinal rack 207 is fixedly connected to the second sleeve 202 on the rear first slide rail 2 through a connecting rod, and the right longitudinal rack 207 is fixedly connected to the second sleeve 202 on the front first slide rail 2 through a connecting rod.

[0029] When the device is in use, with the help of the sliding connection between the first slide rail 2 and the first slide sleeve 201 on the outer side of each template 102, and the sliding connection between the second slide rail 203 and the third slide sleeve 204, each template 102 can move stably in the pressurized box 1. Since the two horizontal racks 206 are meshed and connected to the front and rear sides of the gear column 205, and the two horizontal racks 206 are respectively connected to the left and right templates 102, the movement of the left and right templates 102 after being pressed is synchronous, and the directions are relative, and they will approach synchronously. Similarly, since the two longitudinal racks 207 are meshed and connected to the left and right sides of the gear column 205, and the two longitudinal racks 207 are respectively connected to the front and rear templates 102, the movement of the front and rear templates 102 after being pressed is synchronous. The movements are synchronous and in opposite directions, and they will approach each other synchronously. Since the two transverse racks 206 and the two longitudinal racks 207 are all meshed with the gear column 205 and cooperate with the sliding connection between the two adjacent templates 102, the movement of the four front, back, left and right templates 102 is synchronous. When one of the templates 102 moves due to the extrusion of hydraulic oil, with the meshing of the gear column 205 and the transverse rack 206 and the longitudinal rack 207, the templates 102 in the remaining directions will move evenly and synchronously, and the movement amplitude is consistent, thereby applying balanced and stable isostatic extrusion molding to the raw materials in the molding cavity. After being pressurized, the four templates 102 move synchronously to the center of the molding cavity, thereby ensuring the stability of the isostatic pressing of the ceramic insulating tube in the molding cavity.

[0030] During actual operation, when the return port 104 is closed, the hydraulic oil pressurizing device conveys the hydraulic oil to the pressurizing box 1 through the oil pipe 107 under high pressure. Along with the high-pressure filling of the hydraulic oil, the four templates 102 are squeezed and pushed, and move synchronously to the center position in the molding cavity. When the four templates 102 move to the extreme position, the raw material is isostatically pressed in the molding cavity. After the magnesium oxide-based ceramic insulating tube is isostatically pressed, the staff controls the cover plate 105 to flip outward through the flipping drive mechanism to reopen the return port 104, and then the hydraulic oil injected with high pressure in the pressurizing box 1 is extracted, and along with the hydraulic oil filled in the isostatic pressing process is extracted, each template 102 is reset to its initial state. During this process, the arc wall 103 is separated from the outer end wall of the ceramic insulating tube, and the staff can take out the isostatically pressed magnesium oxide-based ceramic insulating tube through the return port 104 opened at the top.

[0031] In the specific implementation process, Figure 1 and Figure 8 As shown, a first lifting mechanism for driving the inner frame 401 to move up and down is installed in the outer frame 4, and the first lifting mechanism includes a first toothed rod 402 vertically fixed on the outer end wall of the inner frame 401, and a first gear 403 meshing with the first toothed rod 402 is rotatably installed in the outer frame 4, and a first motor 404 is fixed in the outer frame 4, and the driving shaft of the first motor 404 is connected to the first gear 403 in transmission connection. When the device is used, in the process of taking the formed ceramic insulating tube, when the arc wall 103 is separated from the outer end wall of the insulating ceramic tube, the ceramic insulating tube is still sleeved on the outer side of the upper end of the column core 101. At this time, the staff can control the first lifting mechanism to start and continue to transport the column core 101 upward. The first motor 404 is powered on and started to drive the first gear 403 connected to its driving shaft to rotate, and the inner frame 401 is driven to rise upward in the outer frame 4 by means of the meshing of the first gear 403 and the first toothed rod 402. The column core 101 is mounted in a sleeve 5 fixed in the inner frame 401, so that the rise of the inner frame 401 will drive the column core 101 to rise further, thereby driving the column core 101 to drive the ceramic insulating tube sleeved on the outer side of its upper end to move upward, and move to the top of the pressurized box 1 through the withdrawal port 104, and then the staff controls the cover plate 105 to close in the withdrawal port 104 again through the flip driving mechanism. In this state, the ceramic insulating tube sleeved on the outer side of the upper end of the column core 101 is in the upper position of the closed cover plate 105, and then the staff drives the first lifting mechanism to start in reverse, and controls the column core 101 to move downward. Since the bottom of the ceramic insulating tube will be blocked by the cover plate 105, and the descent of the column core 101 is not restricted, the ceramic insulating tube will be separated from the column core 101. After the column core 101 descends and shrinks into the molding cavity, the isostatically pressed ceramic insulating tube is completely separated from the column core 101 and stays on the cover plate 105, which is more convenient for the staff to demold and take out materials.

[0032] During the operation of the device, four templates 102 are movably installed in the pressurizing box 1, and with the help of the guidance and coordination of the moving holding mechanism, the four templates 102 can move synchronously after the pressurization in the pressurizing box 1, and stably and synchronously apply the same extrusion pressure to the raw materials in the molding cavity from all directions, so as to realize the isostatic pressing of the magnesium oxide-based ceramic insulating tube. At the same time, the withdrawal port 104 is opened at the top of the pressurizing box 1, which is above the molding cavity, and the column core 101 can move up and down under the control of the first lifting mechanism, so that the ceramic insulating tube after isostatic pressing can be separated from the molding cavity upward through the withdrawal port 104, which is convenient for the staff to demold and take out the material. Compared with the prior art of filling the raw materials into a special isostatic pressing mold, and then putting the isostatic pressing mold into the pressurizing equipment for isostatic pressing production, the device can avoid the staff from assembling the mold before isostatic pressing, and disassembling the mold after isostatic pressing, and can realize rapid demolding and resetting, as well as continuous production, which can effectively improve the isostatic pressing production efficiency of magnesium oxide-based ceramic insulating tubes.

[0033] In the specific implementation process, Figure 1 and Figure 8 - Fig.10 As shown, a gear disc 504 is provided on the outer movable sleeve of the column core 101, a vertically arranged slide groove 505 is provided on the cylindrical surface of the column core 101, a slider 506 adapted to the slide groove 505 is fixed in the gear disc 504, a third gear 507 meshing with the gear disc 504 is rotatably installed in the inner frame 401, a first bevel tooth 508 is fixed on the driving shaft of the second motor 503, a second bevel tooth 509 meshing with the first bevel tooth 508 is fixed above the third gear 507, an adapter 303 is rotatably connected to the bottom end of the column core 101, and the adapter 303 is fixedly connected to the feed hose 302, a tooth groove 501 is arranged around the cylindrical surface of the column core 101, and the depth of the slide groove 505 is set to 1 / 2 of the depth of the tooth groove 501.

[0034] When the device is in use, the staff uses the second lifting mechanism to control the column core 101 to rise from the bottom to the top in the molding cavity. During the raw material supply process, the second motor 503 is powered on to start and drive the first bevel gear 508 to rotate. With the help of the meshing of the first bevel gear 508 and the second bevel gear 509, the third gear 507 is driven to rotate synchronously, and then with the help of the meshing of the third gear 507 and the toothed disc 504, the toothed disc 504 is driven to rotate. Since the slider 506 fixed in the toothed disc 504 is slidably inserted into the slide groove 505 opened on the cylindrical surface of the column core 101, the column core 101 is driven to rotate during the rotation of the slider 506, and then the column core 101 is rotated during the process of rising from the bottom to the top in the molding cavity. The feeding port 301 opened on the cylindrical surface of the upper end of the column core 101 is driven to move around in the molding cavity, and the magnesium oxide-based ceramic raw material is more evenly transported to the molding cavity, which can improve the density and stability of the ceramic insulating tube during static pressing to a certain extent.

[0035] Since the supply hose 302 is fixedly connected to the adapter 303, and the adapter 303 is rotatably connected to the bottom of the column core 101, the rotation of the column core 101 will not cause entanglement interference to the supply hose 302. By surrounding the tooth groove 501 on the cylindrical surface below the column core 101, and the opening depth of the tooth groove 501 is greater than the opening depth of the slide groove 505, the rotation of the column core 101 will not interfere with the meshing of the second gear 502 and the tooth groove 501, thereby effectively ensuring the stability of the device during operation. During the actual use of the device, the first lifting mechanism and the second lifting mechanism can flexibly adjust the lifting control of the column core 101 according to actual needs, thereby effectively ensuring the flexibility of the device during actual use.

[0036] Specifically, the working principle and operation method of the present invention are as follows: With the help of the second lifting mechanism, the column core 101 is driven to move from bottom to top in the molding cavity formed by the numerous templates 102 and the arc-shaped wall 103, and the magnesium oxide-based ceramic raw material is evenly filled in the molding cavity from bottom to top through the connection between the feeding channel 3 and the feeding port 301 and the rotation of the column core 101. After the top of the column core 101 rises to the top of the pressurizing box 1, the left and right cover plates 105 are controlled by the flipping driving mechanism to be closed in the return port 104, and the feeding port 301 is blocked. The supply operation of the magnesium oxide-based ceramic raw material is continuously maintained in the feeding channel 3. At the contact position between the feeding port 301 and the groove 106, a lateral extrusion thrust is applied to the cover plate 105. In conjunction with the restriction in the flipping driving mechanism, the sealing stability at the return port 104 is ensured. The hydraulic oil is continuously injected into the pressurizing box 1 through the oil pipe 107. The four templates 102 are driven to move and approach each other through the high pressure after the hydraulic injection. With the help of the moving holding mechanism The coordinated guidance of the four templates 102 makes them move synchronously, and a balanced and stable extrusion pressure is applied synchronously from all sides, so that the molding cavity is finally reduced to a cylindrical structure, and the high-pressure dense extrusion molding of the magnesium oxide-based ceramic insulating tube is completed. After the ceramic insulating tube is extruded, the cover plate 105 is turned outward again, so that the withdrawal port 104 is opened, and along with the extraction of the hydraulic oil filled in the column core 101, each template 102 moves in the opposite direction and resets to the initial state, and then the first lifting mechanism is started, driving the inner frame 401 to drive the column core 101 to continue to move upward, and the statically pressed ceramic insulating tube is brought upward out of the molding cavity, and then the cover plate 105 is closed in the withdrawal port 104 again, and the first lifting mechanism is started in the reverse direction, driving the inner frame 401 to drive the column core 101 to descend, and blocked by the cover plate 105, the magnesium oxide-based ceramic insulating tube stays on the top of the cover plate 105, and the staff collects the statically pressed ceramic insulating tubes, and then uniformly performs sintering operations.

[0037] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An isostatic pressing device for magnesium oxide-based ceramic insulating tubes, comprising a pressurizing box (1), characterized in that: A vertically arranged column core (101) is slidably installed in the pressurized box (1), and four templates (102) are evenly distributed around the column core (101) and installed in the pressurized box (1), and two adjacent templates (102) are slidably connected to each other, and the upper and lower ends of the templates (102) are respectively slidably connected to the upper and lower inner end walls of the pressurized box (1), and a side of the plurality of templates (102) close to the column core (101) in the counterclockwise direction is provided with an arc-shaped wall (103), and the top of the pressurized box (1) is opened. A material return port (104) is provided corresponding to the column core (101), and a cover plate (105) is sealed inside the material return port (104); an oil pipe (107) is connected to the outer end wall of the pressurizing box (1); an outer frame (4) is provided below the pressurizing box (1), and an inner frame (401) is installed inside the outer frame (4); the lower end of the column core (101) is vertically inserted into the inner frame (401), and a first lifting mechanism for driving the inner frame (401) to move up and down is installed inside the outer frame (4).

2. The isostatic pressing equipment for magnesium oxide-based ceramic insulation tubes according to claim 1, characterized in that: A moving and holding mechanism is installed in the pressurizing box (1), and the moving and holding mechanism comprises a first slide rail (2) horizontally fixed on the end wall of each template (102) away from the column core (101), a first slide sleeve (201) and a second slide sleeve (202) are slidably installed on the first slide rail (2), a second slide rail (203) vertically arranged with the first slide rail (2) is horizontally fixed on the first slide sleeve (201), and a third slide sleeve (204) fixedly connected with the inner end wall of the pressurizing box (1) is slidably sleeved on the second slide rail (203).

3. The isostatic pressing equipment for magnesium oxide-based ceramic insulation tubes according to claim 2, characterized in that: A gear column (205) is rotatably mounted in the pressurizing box (1), and the front and rear sides of the gear column (205) are meshedly connected with transverse racks (206) symmetrically arranged about the central axis, and the left and right sides of the gear column (205) are meshedly connected with longitudinal racks (207) symmetrically arranged about the central axis, the transverse racks (206) and the longitudinal racks (207) are located in different planes, and the transverse racks (206) and the longitudinal racks (207) are both connected with connecting rods, and the transverse racks (206) at the front are connected with connecting rods. The first slide rail (206) is fixedly connected to the second slide sleeve (202) on the left first slide rail (2) through a connecting rod, the rear transverse rack (206) is fixedly connected to the second slide sleeve (202) on the right first slide rail (2) through a connecting rod, the left longitudinal rack (207) is fixedly connected to the second slide sleeve (202) on the rear first slide rail (2) through a connecting rod, and the right longitudinal rack (207) is fixedly connected to the second slide sleeve (202) on the front first slide rail (2) through a connecting rod.

4. The isostatic pressing equipment for magnesium oxide-based ceramic insulation tube according to claim 1, characterized in that: A vertically arranged material supply channel (3) is provided in the column core (101); a material supply port (301) communicating with the material supply channel (3) is provided above the column core (101); a material supply hose (302) communicating with the inside of the material supply channel (3) is installed at the bottom of the column core (101); and a second lifting mechanism for driving the column core (101) to move up and down is installed in the inner frame (401).

5. The isostatic pressing equipment for magnesium oxide-based ceramic insulation tube according to claim 1, characterized in that: Two cover plates (105) are provided in total, and a flip driving mechanism is connected between the two cover plates (105) and the top of the pressurized box (1). A groove (106) adapted to the column core (101) is provided on the cover plate (105). The first lifting mechanism comprises a first gear rod (402) vertically fixed on the outer end wall of the inner frame (401), a first gear (403) meshing with the first gear rod (402) is rotatably installed in the outer frame (4), a first motor (404) is fixed in the outer frame (4), and a drive shaft of the first motor (404) is transmission-connected to the first gear (403).

6. The isostatic pressing equipment for magnesium oxide-based ceramic insulation tubes according to claim 4, characterized in that: The feed port (301) is opened on the cylindrical surface at the upper end of the feed channel (3), and the thickness of the cover plate (105) is set to be twice the inner diameter of the opening of the feed port (301).

7. The isostatic pressing equipment for magnesium oxide-based ceramic insulation tubes according to claim 4, characterized in that: The second lifting mechanism comprises a sleeve (5) fixedly mounted in the inner frame (401), the column core (101) being slidably inserted in the sleeve (5), the cylindrical surface of the column core (101) being provided with tooth grooves (501) evenly distributed from bottom to top, a second gear (502) being rotatably mounted in the sleeve (5) and meshing with the tooth grooves (501), a second motor (503) being fixed in the inner frame (401), and a drive shaft of the second motor (503) being transmission-connected to the second gear (502).

8. The isostatic pressing equipment for magnesium oxide-based ceramic insulation tubes according to claim 7, characterized in that: The outer movable sleeve of the column core (101) is provided with a toothed disc (504), the cylindrical surface of the column core (101) is provided with a vertically arranged slide groove (505), a slider (506) adapted to the slide groove (505) is fixed in the toothed disc (504), a third gear (507) meshing with the toothed disc (504) is rotatably installed in the inner frame (401), a first bevel gear (508) is fixed on the driving shaft of the second motor (503), a second bevel gear (509) meshing with the first bevel gear (508) is fixed above the third gear (507), an adapter (303) is rotatably connected to the bottom end of the column core (101), and the adapter (303) is fixedly connected to the feed hose (302), the tooth groove (501) is circumferentially provided on the cylindrical surface of the column core (101), and the depth of the slide groove (505) is set to be 1 / 2 of the depth of the tooth groove (501).

9. The isostatic pressing equipment for magnesium oxide-based ceramic insulation tubes according to claim 5, characterized in that: The flipping drive mechanism comprises two rotating shafts (6) rotatably mounted on the top of the pressurizing box (1); the two cover plates (105) are rotatably mounted on the top of the pressurizing box (1) via the corresponding rotating shafts (6); a fourth gear (601) is fixed at the end of the rotating shaft (6); a second gear rod (602) meshing with the fourth gear rod (601) is slidably mounted on the top of the pressurizing box (1); a hydraulic push rod (603) arranged parallel to the second gear rod (602) is fixed on the top of the pressurizing box (1); and a telescopic end of the hydraulic push rod (603) is fixedly connected to the second gear rod (602).

10. A high voltage densification method for a magnesium oxide-based ceramic insulating tube, characterized in that: The high-pressure densification method is implemented by using the isostatic pressing equipment for magnesium oxide-based ceramic insulation tubes according to any one of claims 1 to 9, and the high-pressure densification method comprises the following steps: S1, with the aid of a second lifting mechanism, driving the column core (101) to move from bottom to top in a molding cavity formed by a plurality of templates (102) and an arc-shaped wall (103), and through the connection between the feeding channel (3) and the feeding port (301), and the rotation of the column core (101), the magnesium oxide-based ceramic raw material is evenly filled in the molding cavity from bottom to top; S2, after the top of the column core (101) rises to the top of the pressurized box (1), the left and right cover plates (105) are controlled by the flip drive mechanism to be closed in the material withdrawal port (104), and the material supply port (301) is blocked; S3, the feeding operation of the magnesium oxide-based ceramic raw material is continuously maintained in the feeding channel (3), and a lateral extrusion force is applied to the cover plate (105) at the contact position between the feeding port (301) and the groove (106), and the sealing stability at the material withdrawal port (104) is ensured in conjunction with the restriction in the flip driving mechanism; S4. Hydraulic oil is continuously injected into the pressurized box (1) through the oil pipe (107). The high pressure after the hydraulic injection drives the four templates (102) to move and approach each other. With the help of the coordinated guidance of the moving holding mechanism, the four templates (102) move synchronously, and a balanced and stable extrusion pressure is applied synchronously from all sides, and finally the molding cavity is reduced to a cylindrical structure, thereby completing the high-pressure dense extrusion molding of the magnesium oxide-based ceramic insulating tube.

Images