Multilayer large-tonnage dielectric ceramic filtering forming machine

Abstract

The invention relates to a multi-layer large-tonnage dielectric ceramic filter forming machine which comprises a rack, a main oil cylinder, a top cylinder and a formwork, the rack is of an integral frame type and is designed in a front-back and left-right central symmetry mode, the rack comprises an upper beam and a lower beam, the main oil cylinder is installed in the middle of the upper beam, the top cylinder is installed in the middle of the lower beam, and a notch for installing the formwork is formed in the middle of the rack. The die frame comprises an upper punch mounting part, a lower punch mounting part, a female die plate, a core rod mounting part, an upper die plate, a lower die plate and a servo electric cylinder. The device has the advantages that the high-precision servo electric cylinder is used as a driving source of the floating template, so that the requirement of equal compression ratio during forming of a multi-step product is easily met, and the defects of layering, cracks and the like caused by unequal compression ratio during forming of the product are overcome. The speed of the servo electric cylinder can be set with high precision through a touch screen.

Description

Technical Field

[0001] The invention relates to the field of dielectric ceramic filter forming machinery, and in particular to a multi-layer large-tonnage dielectric ceramic filter forming machine. Background Art

[0002] Dielectric ceramic filters are an important component of 5G and 6G mobile communication base stations. Molding equipment directly affects the quality and performance of dielectric filters. At present, dielectric ceramic filter products are developing towards more complex structures and larger surface areas, which brings more molding difficulties to the existing production model.

[0003] Dielectric filter ceramics are a kind of ceramic products with blind holes of different depths on the top and bottom surfaces. They require high-precision molding without defects. Blind holes of different depths are the key to product molding.

[0004] At present, there are several ways to form dielectric ceramic filters: ① Mechanical press forming ② Servo electric press forming ③ Servo hydraulic press forming. Mechanical presses are mainly used to press small products with few blind holes; servo electric cylinder presses are also used to press small products with many blind holes; large-tonnage hydraulic presses are mainly used to form product blanks, and then machine blind holes. The equipment cost and post-processing cost of the latter two pressing methods are relatively high, and the former two pressing methods are limited by the nominal pressure and cannot produce dielectric ceramic filters with large structures with multiple blind holes. In order to produce large dielectric ceramic filters, solving the problem of high-pressure forming equipment and the forming process that adapts to the pressing of large equipment has become an important part of production. In order to complete the production of large dielectric ceramic filters, a lot of effort has been devoted to the technical research and development of equipment, process improvement, production and processing, and product debugging, and it has been put on the market for use, which has solved the problem of forming large dielectric ceramic filters in a breakthrough way. Summary of the invention

[0005] In order to solve the above technical problems, the present invention proposes a multi-layer large-tonnage dielectric ceramic filter forming machine, which has a clever design, a reasonable and compact structure, stable equipment operation, high efficiency, and its performance fully meets the product forming requirements.

[0006] The technical solution of the present invention: A multi-layer large-tonnage dielectric ceramic filter forming machine comprises a frame, a main oil cylinder, a top cylinder and a mold frame. The frame is an integral frame type and is designed to be symmetrical in front and back and left and right. The frame comprises an upper beam and a lower beam. The main oil cylinder is installed in the middle of the upper beam, and the top cylinder is installed in the middle of the lower beam. A slot for installing the mold frame is opened in the middle of the frame. The mold frame comprises an upper die punch mounting part, a lower die punch mounting part, a female die plate, a core rod connecting plate, an upper die plate, a lower die plate, and a servo electric cylinder. The upper die punch mounting part comprises an upper die plate, an upper second die plate, and an upper third die plate. An upper guide column is installed at each of the four corners of the upper end of the female die plate. The four corners of the upper die plate, the upper third die plate, the upper second die plate and the upper die plate are correspondingly installed in sequence from top to bottom. On the four upper guide pillars, the upper template is connected to the equal-height pads and connected to the upper template through the equal-height pads. The equal-height pads slide up and down and penetrate the upper template and the second upper template near the edge. The middle of the upper end of the upper template is connected to the lower telescopic end of the main oil cylinder. Four servo electric cylinders are symmetrically installed on the upper plane of the upper template to control the extension of the second upper template and the third upper template; the lower ends of two servo electric cylinders penetrate the upper template and then are fixedly connected to the two sides of the third upper template, and the lower ends of the remaining two servo electric cylinders penetrate the upper template and the third upper template respectively and then are fixedly connected to the two sides of the second upper template; the upper die punch moves axially along the upper four guide pillars on the female die, and the movement center line is guaranteed to be coaxial with the female die.

[0007] The upper and lower ends of the four lower guide pillars of the mold frame are connected to the female mold plate and the lower mold plate. The lower end of the female mold plate is connected to the upper sides of the lower mold plate through two lower guide pillars on both sides; the middle of the lower end of the lower mold plate is connected to the upper telescopic end of the top cylinder; the lower die punch installation part includes a fixed mold plate, a lower second mold plate, a lower third mold plate, a lower fourth mold plate, a lower fifth mold plate, a lower sixth mold plate and a lower fixed plate. The fixed mold plate, the lower second mold plate, the lower third mold plate, the lower fourth mold plate, the lower fifth mold plate, the lower sixth mold plate and the lower fixed plate are slidably installed on the four lower guide pillars from top to bottom in sequence. The two sides of the fixed mold plate are fixedly installed on the inner side of the frame. The lower end of the lower fixed plate is fixed on the frame through a fixed bracket. A number of servo electric cylinders are installed on the lower end of the lower fixed plate. The servo electric cylinders are connected to the corresponding lower second mold plate, the lower third mold plate, the lower fourth mold plate, the lower fifth mold plate or the lower sixth mold plate after correspondingly passing through the upper end of the mold plate; a core rod connecting plate is installed in the middle of the upper end of the lower mold plate.

[0008] The fixed template and the bracket plate are slidably connected to the lower four guide pillars. The lower two to lower eight templates are symmetrically connected to the servo electric cylinder, and the servo electric cylinder makes precise axial motion along the lower four guide pillars. The servo electric cylinder is fixed on the bracket plate, totaling fourteen pieces.

[0009] Since high-precision servo electric cylinder is used as the driving source of the floating template, it is easy to achieve the requirement of equal compression ratio when forming multi-step products, and solve the defects such as delamination and cracks caused by unequal compression ratio during product forming. The speed of the servo electric cylinder can be set with high precision through the touch screen.

[0010] The female mold plate is connected to the female mold, and the feeding mechanism is installed on the female mold plate.

[0011] A rectangular slot hole is designed in the middle of the frame and runs through the front and back. A crossbeam is installed near the upper end of the rectangular slot hole. A step is respectively arranged on both sides of the middle of the rectangular slot hole, and both sides of the fixed template are respectively installed on the steps.

[0012] The lower end of the main oil cylinder is also equipped with a main shaft adjustment mechanism, which includes an anti-rotation plate, a plane on the anti-rotation plate is connected to the lower end of the large piston rod of the main oil cylinder, a guide column is respectively installed at the four corners of the anti-rotation plate, and guide sleeves are respectively installed on the corresponding guide columns on the upper beam, and the upper ends of the guide columns slide in the corresponding guide sleeves; a worm gear assembly is installed at the lower end of the anti-rotation plate, the upper end of the main shaft is located in the middle of the worm wheel, and the outer side of the main shaft is spirally matched with the middle worm wheel of the worm gear assembly; a hole is opened in the middle of the anti-rotation plate for the upper end of the main shaft to pass through, and a hole is also reserved at the lower end of the large piston rod of the main oil cylinder for the top end of the main shaft to extend and retract; the lower end of the main shaft slides through the middle of the crossbeam, and a guide sleeve for the main shaft to slide through is installed on the crossbeam; the lower end of the main shaft is connected to the middle position of the upper end of the upper template.

[0013] The machine adopts four-corner four-guide column guidance, and the guide sleeve is connected to the machine body to prevent the large piston rod from rotating when it is subjected to hydraulic pressure. The lower plane is connected to the worm gear reduction motor. When the upward punch descends and enters the female mold to press the product, the piston rod descends until it is pressed down to the main cylinder limit. The final molding height of the product is determined by the spindle adjustment mechanism. The molding limit of the product is that the main cylinder piston is pressed on the cylinder mouth gasket. The adjustment of the spindle adopts the spiral lifting adjustment principle. The spindle and the worm gear of the worm gear reduction motor are spirally matched. The motor rotates the worm to drive the worm gear, so that the spindle moves up and down. The up and down stroke of the spindle is set by the touch screen. The spindle guide sleeve is connected to the center of the crossbar of the machine body. The spindle and the guide sleeve are slidably matched to ensure the stability of the spindle when it is under pressure. The lower end of the spindle is connected to the upper mold plate of the mold frame, and two through pins are used between the two parts to prevent rotation and position. The worm gear reduction motor includes a box, a worm, a worm wheel, a motor, etc. It is installed on the lower plane of the anti-rotation plate. Another function of the spindle adjustment mechanism is to prevent the mold from being crushed due to empty mold operation. When the upper punch is connected and the die is adjusted, the upper punch must be raised in advance. According to the lubrication requirements of the friction pair, the friction surfaces of the guide pin and the guide sleeve can be lubricated through the oil injection hole to prevent the friction temperature from damaging the mating surface and affecting the machine accuracy.

[0014] The master oil cylinder comprises a large cylinder body, a large piston head, a large piston rod, a small cylinder body, a small piston head, a small piston rod, a valve seat and a filling valve. A large piston head is slidably installed in the middle of the large cylinder body, one end of the large piston head is connected to the large piston rod, the large piston rod and the large piston head are integrally formed, one end of the large piston rod slides and seals through one end of the large cylinder body, and an inlet and outlet oil passage is designed near the end of the large cylinder body, the outer side of the inlet and outlet oil passage is connected to the outer peripheral surface of the large cylinder body, the inner side of the inlet and outlet oil passage is connected to the interior of the large cylinder body, a circular hole is opened at the other end of the large cylinder body, and a valve seat is installed at the mouth of the circular hole, the middle of the other end of the large piston head is designed as a small cylinder body, a small piston head is slidably installed in the small cylinder body, one end of the small piston head is connected to one end of the small piston rod, the other end of the small piston rod is connected to the inner side of the valve seat, and the filling valve is installed on the outer side of the valve seat; two L-shaped flow passages are designed in the valve seat, One end of the two L-shaped flow channels is connected to the inner end face of the valve seat and the other end is connected to the outer peripheral surface of the valve seat; the small piston rod and the small piston head are integrally formed, and two axial flow channels are designed in the middle of the small piston rod, and both axial flow channels are connected at both ends; one end of one axial flow channel is connected to the end face of the small piston head and the other end is connected to an L-shaped flow channel of the valve seat; one end of the other axial flow channel is blocked with the end face of the small piston head and the other end is connected to another L-shaped flow channel of the valve seat, and at the same time, a radial flow channel is also provided on one side of the axial flow channel, one end of the radial flow channel is connected to the outer side of the root where the small piston rod is connected to the small piston head, and the radial flow channel is connected to the axial flow channel; a valve cavity is opened in the middle of the outer end of the valve seat, and the filling valve is sealed and installed on the valve cavity mouth, one side of the valve cavity is connected to the outer peripheral surface of the valve seat through a main oil inlet flow channel, and the bottom of the valve cavity is connected to the inner end face of the valve seat through two oil channels.

[0015] The large piston head is in sliding sealing cooperation with the inside of the large cylinder body; the small piston head is in sliding sealing cooperation with the inside of the small cylinder body.

[0016] The hydraulic oil cylinder also includes a large guide sleeve, a large locking nut, a small guide sleeve, and a small locking nut. The outer peripheral surface of the large cylinder body is designed with a sealing ring groove, and one end of the large cylinder body is designed with an annular step and the inner wall of the annular step is provided with an internal thread. An annular boss is designed on the outer periphery of one end of the large guide sleeve. The large guide sleeve is installed on the inner side of the mouth of the large cylinder body and a sealing ring is installed between the large guide sleeve and the large cylinder body. The sealing ring is located in the sealing ring groove, and the annular boss is pressed on the end face of the annular step. The large locking nut is screwed into the internal thread of the annular step to lock the large guide sleeve; an annular groove is provided on the inner side of one end of the large guide sleeve, and the large piston rod slides through the large guide sleeve. A sealing ring is installed between the large guide sleeve and the large piston rod. In the annular groove; the outer circumferential surface of the small cylinder body is designed with multiple sealing ring grooves, one end of the small cylinder body is designed with an annular step and the inner wall of the annular step is set with an internal thread, one end of the small guide sleeve is designed with an annular boss, the small guide sleeve is installed on the inner side of the mouth of the small cylinder body and a number of sealing rings are installed between the small guide sleeve and the small cylinder body, the several sealing rings are located in the multiple sealing ring grooves, the annular boss is pressed on the end face of the annular step, and the small locking nut is screwed into the internal thread of the annular step to lock the small guide sleeve; a plurality of annular grooves are provided on the inner side of one end of the small guide sleeve, the small piston rod slides through the small guide sleeve, a number of sealing rings are installed between the small guide sleeve and the small piston rod, and the sealing rings are installed in the corresponding annular grooves.

[0017] The top cylinder is a double-axis extension top cylinder, and a limiting device is installed at the lower end of the lower extension rod of the top cylinder. It includes a push-pull cylinder, a lower pad, a slide rail, an upper pad, and a top cylinder height adjustment mechanism. The top cylinder height adjustment mechanism is installed below the lower extension rod of the top cylinder, and an upper pad is installed at the lower end of the lower extension rod of the top cylinder. The top cylinder height adjustment mechanism includes a support plate, a slide rail is installed on the support plate, and the lower pad is slidably installed on the slide rail. The push-pull cylinder is installed on one side of the support plate, and the telescopic end of the push-pull cylinder is connected to one side of the lower pad. The upper end face of the lower pad is designed to be an upper inclined surface that sinks away from one side of the push-pull cylinder, and the lower end face of the upper pad is designed to be a lower inclined surface, and the lower inclined surface is beveled to match the upper inclined surface; the inclination angle of the upper inclined surface is 4 degrees.

[0018] A front proximity switch and a rear proximity switch are arranged on one side of the push-pull cylinder, and the front proximity switch and the rear proximity switch are respectively installed on the support plate with a certain distance between them; a transverse plate and a bump block are installed on one side of the lower pad, one end of the transverse plate is installed on one side of the lower pad near the rear end, and the other end of the transverse plate is located on the rear side of the lower pad, and a bump block is installed on the other end of the transverse plate, and the bump block cooperates with the front proximity switch and the rear proximity switch respectively.

[0019] The top cylinder height adjustment mechanism also includes a worm wheel, a worm, a driving motor, a lifting sleeve, a support sleeve and a support. The support sleeve is installed at the lower end of the support plate, the support is installed at the lower end of the support sleeve, and the lifting sleeve is installed in the support sleeve. The outer side of the lifting sleeve is designed with an external thread, and the inner side of the worm wheel is designed with an internal thread. The worm wheel is rotatably installed on the outer side of the lifting sleeve and the worm wheel can be rotatably located in the middle position of the support sleeve. The worm is rotatably installed on one side of the support sleeve and the worm is meshed with the worm wheel; the driving motor is located on the outer side of the support sleeve and the driving motor drives one end of the worm; a guide column is respectively installed on both sides of the support plate, a connecting plate is installed at the lower end of the lower extension rod of the top cylinder, an upper pad is installed in the middle of the lower end of the connecting plate, and a guide sleeve is designed and installed on both sides of the connecting plate respectively, and the upper ends of the two guide columns are correspondingly slidably installed in the guide sleeve.

[0020] Upper punches are installed under the upper template, upper third template, upper second template and upper template respectively, and the upper punch of the upper template slides in the middle of the upper punch of the upper three templates, the upper punch of the upper three templates slides in the middle of the upper punch of the upper second templates, and the upper punch of the upper second templates slides in the middle of the upper punch of the upper template; a female template is installed in the middle of the female template; lower punches are installed on the fixed template, lower second templates, lower third templates, lower fourth templates, lower fifth templates, lower sixth templates and lower fixed plate respectively, the lower punch of the lower six templates slides in the middle of the lower punch of the lower five templates, the lower punch of the lower five templates slides in the middle of the lower punch of the lower four templates, the lower punch of the lower four templates slides in the middle of the lower punch of the lower three templates, the lower punch of the lower three templates slides in the middle of the lower punch of the lower two templates, the lower punch of the lower two templates slides in the middle of the lower punch of the fixed template, and the lower punch of the fixed template slides in the middle of the female template.

[0021] The advantages of the present invention are: Since high-precision servo electric cylinder is used as the driving source of the floating template, it is easy to achieve the requirement of equal compression ratio when forming multi-step products, and solve the defects such as delamination and cracks caused by unequal compression ratio during product forming. The speed of the servo electric cylinder can be set with high precision through the touch screen.

[0022] When the main oil cylinder is running without load, the oil is introduced into the small cylinder to change the running speed of the large piston rod. Under the rated flow rate, the volume of the working chamber of the small cylinder is inversely proportional to the running speed of the large piston rod. By changing the oil cylinder structure, the oil cylinder has a significantly improved working efficiency in actual use without increasing the flow rate, and saves users the purchase cost and the user's use cost. The top cylinder adopts a limit device different from the traditional mechanical one. The force contact surfaces of the upper and lower pads are inclined surfaces with an angle of less than 4 degrees. When the lower pad leaves the upper external carrier laterally under external load pressure, the vibration caused by sudden departure is avoided.

[0023] The final molding height of the product can be determined by adjusting the spindle adjustment mechanism; the spindle adjustment mechanism can also prevent the mold from being crushed due to empty mold operation; when the upper punch is connected for mold adjustment, the upper punch must be pulled up in advance, which is safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the present invention.

[0025] Figure 2 It is a schematic diagram of a mold frame of the present invention.

[0026] Figure 3 It is a partially enlarged schematic diagram of the spindle adjustment mechanism of the present invention.

[0027] Figure 4 It is a bottom view schematic diagram of the spindle adjustment mechanism of the present invention.

[0028] Figure 5 It is a schematic diagram of the master cylinder of the present invention.

[0029] Figure 6 It is a schematic diagram of the limiting device below the top cylinder of the present invention.

[0030] Figure 7 It is a side view schematic diagram of the limiting device below the top cylinder of the present invention.

[0031] Figure 8 It is a top view of the lower pad of the limiting device below the top cylinder of the present invention. DETAILED DESCRIPTION

[0032] Refer to the attached Figure 1-8The invention discloses a multi-layer large-tonnage dielectric ceramic filter forming machine, which comprises a frame 100, a main oil cylinder 200, a top cylinder 300, and a mold frame 400. The frame 100 is an integral frame type and is designed to be symmetrical in front and back and left and right directions. The frame 100 comprises an upper beam 101 and a lower beam 102. The main oil cylinder 200 is installed in the middle of the upper beam 101, and the top cylinder 300 is installed in the middle of the lower beam 102. A slot for installing a mold frame 400 is opened in the middle of the frame 100. The mold frame 400 includes The upper die punch installation part includes an upper die punch installation part, a lower die punch installation part, a female die plate 405, a core rod connecting plate 418, an upper die plate 404, a lower die plate 406, and a servo electric cylinder 407. The upper die punch installation part includes an upper die plate 401, an upper second die plate 402, and an upper third die plate 403. An upper guide column 408 is installed at each of the four corners of the upper die plate 404, the upper third die plate 403, the upper second die plate 402, and the upper die plate 401. It should be slidably installed on the four upper guide pillars 408 from top to bottom in sequence, the upper template 401 is connected to the equal height pad 409, and is connected to the upper template 404 through the equal height pad 409, the equal height pad 409 slides up and down to penetrate the upper template 401 and the upper second template 402 near the edge position, the middle of the upper end of the upper template 404 is connected to the lower end telescopic end of the main oil cylinder 200, and four servo electric cylinders 407 are symmetrically installed on the upper plane of the upper template 404 to control the extension of the upper second template 402 and the upper third template 403; the lower ends of two servo electric cylinders 407 penetrate the upper template 404 and then are fixedly connected to the two sides of the upper third template 403, and the lower ends of the remaining two servo electric cylinders 407 penetrate the upper template 404 and the upper third template 403 respectively and then are fixedly connected to the two sides of the upper second template 402; the upper die punch moves axially along the upper four guide pillars on the female template 405, and the movement center line is guaranteed to be coaxial with the female die. The upper and lower ends of the four lower guide pillars of the mold frame 400 are connected to the female mold plate 405 and the lower mold plate 406. The lower end of the female mold plate 405 is connected to the upper ends of the lower mold plate 406 through two lower guide pillars 410 on both sides; the middle of the lower end of the lower mold plate 406 is connected to the upper telescopic end of the top cylinder 300; The lower die punch installation part includes a fixed template 411, a lower second template 412, a lower third template 413, a lower fourth template 414, a lower fifth template 415, a lower sixth template 416 and a lower fixed plate 417. The fixed template 411, the lower second template 412, the lower third template 413, the lower fourth template 414, the lower fifth template 415, the lower sixth template 416 and the lower fixed plate 417 are slidably installed on the four lower guide pillars 410 from top to bottom. The fixed template 411 Both sides are fixedly installed on the inner side of the frame 100, and the lower end of the lower fixed plate 417 is fixed on the frame 100 through a fixed bracket. A plurality of servo electric cylinders 407 are installed on the lower end of the lower fixed plate 417. The servo electric cylinders 407 are arranged in groups of two corresponding to the templates that pass through the upper end and are connected to the corresponding lower second template 412, lower third template 413, lower fourth template 414, lower fifth template 415 or lower sixth template 416; a core rod connecting plate 418 is installed in the middle of the upper end of the lower template 406.

[0033] The upper template 404, the upper third template 403, the upper second template 402 and the upper template 401 are respectively installed with upper punches, the upper punch of the upper template 404 is slidably located in the middle of the upper punch of the upper third template 403, the upper punch of the upper third template 403 is slidably located in the middle of the upper punch of the upper second template 402, and the upper punch of the upper second template 402 is slidably located in the middle of the upper punch of the upper template 401; the female template 405 is installed with a female mold in the middle; the fixed template 411, the lower second template 412, the lower third template 413, the lower fourth template 414, the lower fifth template 415, the lower sixth template Lower punches are installed on 416 and the lower fixed plate 417 respectively, the lower punch of the lower six templates 416 is slidably located in the middle of the lower punch of the lower five templates 415, the lower punch of the lower five templates 415 is slidably located in the middle of the lower punch of the lower four templates 414, the lower punch of the lower four templates 414 is slidably located in the middle of the lower punch of the lower three templates 413, the lower punch of the lower three templates 413 is slidably located in the middle of the lower punch of the lower two templates 412, the lower punch of the lower two templates 412 is slidably located in the middle of the lower punch of the fixed template 411, and the lower punch of the fixed template 411 is slidably located in the middle of the female mold of the female template 405. Before mold closing, four upper punches and six lower punches or eight lower punches are floating. When powder raw materials need to be added, several lower punches are driven upward by the lower two to lower six or lower two to lower eight templates. Each template is pushed by two groups of servo electric cylinders. Several lower punches move upward together with the female mold and the internal core rod to form a lower mold material chamber, and the feeding mechanism sends the powder into the lower mold material chamber; when the mold is closed, the servo electric cylinder group controls the upper three templates and the upper two templates to move downward respectively, and all the upper punches form a precise upper die punch assembly, which is pressed into the lower die material chamber to extrude the powder, maintain pressure, and then open the mold. The upper punches of the upper die punch assembly move upward and reset in turn, and the related lower punches of the lower mold material chamber are reset in turn by controlling the corresponding templates through the servo electric cylinder. The upper two and upper three templates in the present invention are floating templates, and the lower two to lower six or lower eight templates are also floating templates, which are respectively controlled and operated by servo electric cylinders. The number of floating templates can be designed according to actual needs to control the floating pressing process of the product pressing process to meet the pressing needs of precise and complex products.

[0034] The fixed template 411 and the lower fixed plate are slidably connected to the four lower guide pillars, and the lower two to lower six templates or the lower two to lower eight templates are symmetrically connected to the servo electric cylinder 407, and the servo electric cylinder 407 makes precise axial movement along the four lower guide pillars. The servo electric cylinder 407 is fixed on the lower fixed plate, totaling fourteen pieces. Since the high-precision servo electric cylinder 407 is used as the driving source of the floating template, it is easy to achieve the requirement of equal compression ratio when forming multi-step products, and solves the defects such as delamination and cracks caused by unequal compression ratios during product forming. The speed of the servo electric cylinder 407 can be set with high precision through the touch screen.

[0035] The female mold plate 405 is connected to the female mold member, and the feeding mechanism is installed on the female mold plate 405. The design of the feeding mechanism belongs to the prior art and is briefly described in this application.

[0036] The frame 100 is designed with a rectangular slot that runs through the front and back in the middle. A crossbeam 103 is installed near the upper end of the rectangular slot. A step is provided on both sides of the middle of the rectangular slot, and both sides of the fixed template 411 are installed on the steps. The frame is an integral frame type, symmetrical in front and back and left and right directions. The main force direction of the frame coincides with the center line of the molding machine of the present invention. The frame design adopts finite element force analysis to ensure that the frame has sufficient rigidity. The frame is welded from steel plates, and high temperature is used to remove the internal stress of welding after welding. It is processed by high-precision machine tools to ensure the coaxiality of the upper cylinder mounting hole and the verticality with the mold frame mounting surface, so that the frame can meet the performance requirements of the molding machine of the present invention during use. A notch is reserved on the crossbeam for the upper servo electric cylinder to avoid, which is a safety design. The present invention is briefly described.

[0037] The main oil cylinder 200 is also provided with a main shaft adjustment mechanism 500 at the lower end thereof, and the main shaft adjustment mechanism 500 includes an anti-rotation plate 501, the upper plane of the anti-rotation plate 501 is connected to the lower end of the large piston rod 203 of the main oil cylinder 200, and a guide column is respectively provided at the four corners of the anti-rotation plate 501, and guide sleeves are respectively provided on the corresponding guide columns on the upper beam 101, and the upper ends of the guide columns are slidably located in the corresponding guide sleeves; a worm gear assembly 502 is provided at the lower end of the anti-rotation plate 501, and the upper end of the main shaft 503 is located at the worm gear assembly 502. The middle of the wheel and the outer side of the main shaft 503 are spirally matched with the middle of the worm wheel of the worm gear assembly 502; a hole is opened in the middle of the anti-rotation plate 501 for the upper end of the main shaft 503 to pass through, and the lower end of the large piston rod of the main oil cylinder 200 is also reserved with a hole for the top end of the main shaft 503 to extend and retract; the lower end of the main shaft 503 slides through the middle of the crossbeam 103, and a guide sleeve is installed on the crossbeam 103 for the main shaft 503 to slide through; the lower end of the main shaft 503 is connected to the middle position of the upper end of the upper template 404.

[0038] It adopts four-corner four-guide column guidance, and the guide sleeve is connected to the frame to prevent the large piston rod from rotating when it is under liquid pressure. The lower plane is connected to the worm gear reduction motor. When the upward punch descends and enters the female mold to press the product, the piston rod descends until it is pressed down to the main cylinder limit. The final forming height of the product is adjusted and determined by the spindle adjustment mechanism 500. The forming limit of the product is that the main cylinder piston presses on the cylinder mouth gasket. The adjustment of the spindle 503 adopts the spiral lifting adjustment principle. The spindle 503 and the worm gear of the worm gear reduction motor are spirally matched. The motor rotates the worm to drive the worm gear, so that the spindle 503 moves up and down. The up and down stroke of the spindle 503 is set by the touch screen. The spindle 503 guide sleeve is connected to the center of the crossbeam of the frame. The spindle 503 and the guide sleeve are slidably matched to ensure that the spindle 503 is stable when under pressure. The lower end of the spindle 503 is connected to the upper mold plate 404 of the mold frame 400, and two through pins are used between the two parts to prevent rotation and position. The worm gear reduction motor includes a housing, a worm, a worm wheel, a motor, etc., which are installed on the lower plane of the anti-rotation plate 501. The motor drives the worm to rotate, and the worm acts on the worm wheel to rotate. The rotation of the worm wheel makes the worm wheel rotate. Another function of the spindle adjustment mechanism 500 is to prevent the mold from being crushed due to empty mold operation. At the beginning of connecting the upper punch for mold adjustment, the upper punch must be pulled up in advance. According to the lubrication requirements of the friction pair, the friction surface of the guide column and the guide sleeve can be lubricated through the oil filling hole to prevent the matching surface from being damaged due to friction heating and affecting the machine accuracy.

[0039] The master oil cylinder 200 includes a large cylinder body 201, a large piston head 202, a large piston rod 203, a small cylinder body 204, a small piston head 205, a small piston rod 206, a valve seat 207, and a filling valve 208. The large piston head 202 is slidably installed in the middle of the large cylinder body 201, and one end of the large piston head 202 is connected to the large piston rod 203. The large piston rod 203 and the large piston head 202 are integrally formed. One end of the large piston rod 203 slides and seals through one end of the large cylinder body 201, and an inlet and outlet oil channel 209 is designed inside the large cylinder body 201 near the end position. The outer side of the oil outlet passage 209 is connected to the outer peripheral surface of the large cylinder body 201, and the inner side of the oil inlet and outlet passage 209 is connected to the interior of the large cylinder body 201. A round hole is opened at the other end of the large cylinder body 201 and a valve seat 207 is installed at the mouth of the round hole. The middle of the other end of the large piston head 202 is designed as a small cylinder body 204. A small piston head 205 is slidably installed in the small cylinder body 204. One end of the small piston head 205 is connected to one end of the small piston rod 206, and the other end of the small piston rod 206 is connected to the inner side of the valve seat 207. The filling valve 208 is installed on the outer side of the valve seat 207; two L-shaped valves are designed in the valve seat 207. The small piston rod 206 and the small piston head 205 are integrally formed, and two axial flow channels 211 are designed in the middle of the small piston rod 206. Both axial flow channels 211 are connected at both ends; one end of one axial flow channel 211 is connected to the end face of the small piston head 205 and the other end is connected to an L-shaped flow channel 210 of the valve seat 207; one end of the other axial flow channel 211 is blocked with the end face of the small piston head 205 and the other end is connected to the outer peripheral surface of the valve seat 207 Another L-shaped flow channel 210 is connected, and at the same time, a radial flow channel 2111 is also provided on one side of the axial flow channel 211, one end of the radial flow channel 2111 is connected to the outside of the root where the small piston rod 206 is connected to the small piston head 205, and the radial flow channel 2111 is connected to the axial flow channel 211; a valve cavity 212 is opened in the middle of the outer end of the valve seat 207, and the filling valve 208 is sealed and installed at the mouth of the valve cavity 212, one side of the valve cavity 212 is connected to the outer peripheral surface of the valve seat 207 through a main oil inlet flow channel 271, and the bottom of the valve cavity 212 is connected to the inner end surface of the valve seat 207 through two oil channels 2120.

[0040] The large piston head 202 is in sliding and sealing cooperation with the inside of the large cylinder body 201 ; the small piston head 205 is in sliding and sealing cooperation with the inside of the small cylinder body 204 .

[0041] The hydraulic oil cylinder also includes a large guide sleeve 213, a large locking nut 214, a small guide sleeve 215, and a small locking nut 216. The outer peripheral surface of the large cylinder body 201 is designed with a sealing ring groove, and one end of the large cylinder body 201 is designed with an annular step and the inner wall of the annular step is provided with an internal thread. An annular boss is designed on the outer periphery of one end of the large guide sleeve 213. The large guide sleeve 213 is installed on the inner side of the mouth of the large cylinder body 201 and a sealing ring is installed between the large guide sleeve 213 and the large cylinder body 201. The sealing ring is located in the sealing ring groove, and the annular boss is pressed on the end face of the annular step. The large locking nut 214 is screwed into the internal thread of the annular step to lock the large guide sleeve 213; an annular groove is provided on the inner side of one end of the large guide sleeve 213, and the large piston rod 203 slides through the large guide sleeve 213, and a sealing ring is installed between the large guide sleeve 213 and the large piston rod 203. , the sealing ring is installed in the annular groove; the outer circumferential surface of the small cylinder body 204 is designed with multiple sealing ring grooves, one end of the small cylinder body 204 is designed with an annular step and the inner wall of the annular step is set with an internal thread, and an annular boss is designed on the outer circumference of one end of the small guide sleeve 215, the small guide sleeve 215 is installed on the inner side of the mouth of the small cylinder body 204 and a number of sealing rings are installed between the small guide sleeve 215 and the small cylinder body 204, the several sealing rings are located in the multiple sealing ring grooves, the annular boss is pressed on the end face of the annular step, and the small locking nut 216 is screwed into the internal thread of the annular step to lock the small guide sleeve 215; a plurality of annular grooves are provided on the inner side of one end of the small guide sleeve 215, the small piston rod 206 slides through the small guide sleeve 215, and a number of sealing rings are installed between the small guide sleeve 215 and the small piston rod 206, and the sealing rings are installed in the corresponding annular grooves.

[0042] When the master oil cylinder of the present invention is used, first the large piston rod moves downward under load, oil is introduced into the main oil inlet channel on one side of the valve seat, enters the valve cavity, and then enters the cavity between the end of the large piston head and the bottom of the large cylinder body through the two oil channels at the bottom of the valve cavity, and the inlet and outlet oil channels discharge the hydraulic oil between the large piston head and the other end of the large cylinder body, and at the same time an L-shaped channel on one side of the valve seat also starts to supply oil, the L-shaped channel transports the hydraulic oil to the cavity between the end of the small piston head and the bottom of the small cylinder body through the axial channel, the radial oil channel discharges the hydraulic oil between the small piston head and the other end of the small cylinder body, and discharges it into another L-shaped channel through another axial channel, and finally discharges it to the oil tank; the large cylinder body and the small cylinder body are simultaneously supplied with oil to increase the oil intake amount, and the downward pressure of the oil cylinder can be increased without increasing the diameter (volume) of the large oil cylinder; when the large piston rod moves upward for a return stroke During operation, it is no-load operation, which can increase the upward speed. First, the filling valve is opened, and an L-shaped flow channel begins to supply oil, which is transported to the small guide sleeve between the small piston head and the small cylinder body through the axial flow channel and the radial flow channel. The other axial flow channel discharges the hydraulic oil between the small piston head and the bottom of the small cylinder body through another L-shaped flow channel; at this time, the inlet and outlet oil channels begin to supply oil to the space between the large guide sleeve and the large piston head, and the hydraulic oil head between the large piston head and the bottom of the large cylinder body is discharged into the valve cavity through the oil channel of the valve seat, and the valve cavity is quickly depressurized through the filling valve. The flow rate of the filling valve is greater than the flow rate of the main oil inlet flow channel. The main oil inlet flow channel can return oil as needed, or it can remain motionless; without increasing the diameter of the oil return pipe of the cylinder, it is achieved that the upward movement can be fast when the displacement is increased, saving time, improving work efficiency, and saving energy.

[0043] The described top cylinder 300 is a double-axis extension top cylinder. The lower end of the lower extension rod 1 of the top cylinder 300 is installed with a limiting device. The limiting device includes a push-pull oil cylinder 2, a lower pad 3, a slide rail 4, an upper pad 5, and a top cylinder height adjustment mechanism. The top cylinder height adjustment mechanism is installed below the lower extension rod 1 of the top cylinder. The lower end of the lower extension rod 1 of the top cylinder is installed with an upper pad 5. The top cylinder height adjustment mechanism includes a support plate 6. The slide rail 4 is installed on the support plate 6. The lower pad 3 is slidably installed on the slide rail 4. The push-pull oil cylinder 2 is installed on one side of the support plate 6. The telescopic end of the push-pull oil cylinder 2 is connected to one side of the lower pad 3. The upper end face of the lower pad 3 is designed to be an upper inclined surface that sinks away from one side of the push-pull oil cylinder 2. The lower end face of the upper pad 5 is designed to be a lower inclined surface. The lower inclined surface is beveled with the upper inclined surface. The upper inclined surface has an inclination angle of 4 degrees. The lower inclined surface is also 4 degrees. They cooperate with each other to meet the condition of sufficient vertical support force and better slow release to avoid vibration. A front proximity switch 7 and a rear proximity switch 8 are provided on one side of the push-pull oil cylinder 2. The front proximity switch 7 and the rear proximity switch 8 are respectively installed on the support plate 6 and a certain distance is left between the front proximity switch 7 and the rear proximity switch 8; a transverse plate 9 and a bumper block 10 are installed on one side of the lower pad 3. One end of the transverse plate 9 is installed on one side of the lower pad 3 near the rear end, and the other end of the transverse plate 9 is located at the rear side of the lower pad 3. A bumper block 10 is installed on the other end of the transverse plate 9. The bumper block 10 cooperates with the front proximity switch 7 and the rear proximity switch 8 respectively. The front and rear proximity switches cooperate with the bumper block design to control the push-pull oil cylinder to move the lower pad to a set distance. The height adjustment mechanism of the top cylinder also includes a worm wheel 11, a worm 12, a drive motor 13, a lifting sleeve 14, a support sleeve 15 and a support 16. The support sleeve 15 is installed at the lower end of the support plate 6, and the support 16 is installed at the lower end of the support sleeve 15. The lifting sleeve 14 is installed in the support sleeve 15. The outer side of the lifting sleeve 14 is designed with an external thread, and the inner side of the worm wheel 11 is designed with an internal thread. The worm wheel 11 is rotatably installed on the outer side of the lifting sleeve 14 and the worm wheel 11 can be rotatably located in the middle position of the support sleeve 15. The worm 12 is rotatably installed on one side of the support sleeve 15 and the worm 12 is meshed with the worm wheel 11; the drive motor 13 is located on the outer side of the support sleeve 15 and the drive motor 13 drives one end of the worm 12; a guide column 18 is installed on both sides of the support plate 6, and a connecting plate 17 is installed at the lower end of the lower extension rod 1 of the top cylinder, and an upper pad 5 is installed in the middle of the lower end of the connecting plate 17. A guide sleeve is designed and installed on both sides of the connecting plate 17, and the upper ends of the two guide columns 18 are correspondingly slidably installed in the guide sleeve. The design of the top cylinder height adjustment mechanism is prior art and is briefly described in the utility model. For example, the relevant structure is disclosed in patent CN201811312140.7.

[0044] When the top cylinder of the present invention is used, after the parts are formed, the push-pull cylinder contracts to control the lower pad to slide to one side along the slide rail. The contact surface of the lower pad and the upper pad is an inclined surface. In this way, the supporting force is not released suddenly when moving to one side, but is released slowly. The optimal inclined surface angle designed in the utility model is 4 degrees. Without changing the vertical force, the horizontal force surface is designed to be less than 4 degrees. The key problem of the product demoulding support pad being difficult to open or vibrating when opened is solved, and good economic benefits are achieved.

[0045] The large-tonnage molding equipment of the present invention realizes the molding of dielectric ceramic filters with high efficiency, high precision and high consistency. The general automatic process actions of this frame are described as follows: 1) Loading process: When the main oil cylinder returns to the starting position of the material box, the electric cylinder pushes the material box to push out the formed product, and the material box is not in the center of the female mold. The top cylinder pushes out, and the female mold rises with the top cylinder until it reaches the filling position. The material box returns to the center of the female mold and scrapes the filled upper surface of the female mold until it returns to the initial position. This is drop-in filling. If the electric cylinder pushes the material box to push out the formed product, the material box stays in the center of the female mold. The top cylinder pushes out, and the female mold rises with the top cylinder until it reaches the filling position, and the powder fills the female mold at the same time. This is suction filling. The filling method varies depending on the material of the powder.

[0046] 2) Pressurization process: The main oil cylinder goes down quickly or slowly. The upper punch mold starts to compress the powder after entering the female mold. The main oil cylinder piston rod runs to the bottom dead point and the compression ends. The pressurization process can be divided into the following three types: Pre-pressurization of the upper die: At the beginning, the upper punch enters the female die, and the female die does not descend together with the upper punch. The upper punch compresses the powder. This stage is called pre-pressurization. Floating pressurization: When the upper die is pre-pressurized, the density of the upper end of the product increases. As the upper die punch moves downward and pressurizes, the friction between the powder and the female die wall continues to increase. The friction overcomes the force of the top cylinder supporting the female die. The female die and the upper punch descend at the same speed. The lower punch moves relative to the female die. The lower punch pressurizes the bottom surface of the product, and the density of the bottom end of the product increases. This process is called floating pressurization. Final pressurization: The final stage of powder compression, also known as post-pressurization. The upper punch continues to move downward, the female die no longer descends, and the upper punch presses the upper end of the product to increase the density of the upper end of the product. This stage is called final pressurization; Demolding process: After the pressurization of the press machine is completed, the main cylinder maintains the pressure and releases the pressure. At the same time, the main cylinder protects the product with low pressure to ensure that a constant pressure acts on the product through the upper punch; the lower floating punch begins to balance, and through balance, the upward axial elastic deformation of the lower floating punch due to pressure is reduced, thereby avoiding product cracks caused by elastic deformation; after the female mold is pulled down, the protective demoulding is completed, and the upper punch returns to the upper floating punch extension setting position with the main cylinder, the upper floating punch extends out and leaves the upper end surface of the product, and the lower floating punch returns to the retraction setting position, the lower floating punch leaves the product, and the core rod is pulled down to the core rod limit, and the core rod leaves the product; the product is in the demoulding state and stays at the female mold mouth, and the feeding box moves forward to push out the product; the female mold rises, and the lower floating punch moves up to the set position to start the next product pressing process.

Claims

1. Multi-layer large-tonnage dielectric ceramic filter forming machine, characterized in that: It includes a frame, a main oil cylinder, a top cylinder, and a mold frame. The frame is an integral frame type and is designed to be symmetrical in front and back and left and right. The frame includes an upper beam and a lower beam. The main oil cylinder is installed in the middle of the upper beam, and the top cylinder is installed in the middle of the lower beam. A slot for installing the mold frame is opened in the middle of the frame. The mold frame includes an upper die punch mounting part, a lower die punch mounting part, a female die plate, a core rod connecting plate, an upper die plate, a lower die plate, and a servo electric cylinder. The upper die punch mounting part includes an upper die plate, an upper second die plate, and an upper third die plate. An upper guide column is installed at each of the four corners of the upper end of the female die plate. The four corners of the template, upper third template, upper second template and upper template are slid and installed on the four upper guide pillars from top to bottom in sequence. The upper template is connected to the equal height pad and connected to the upper template through the equal height pad. The equal height pad slides up and down through the upper template and the upper second template near the edge position. The middle of the upper end of the upper template is connected to the lower telescopic end of the main oil cylinder. Four servo electric cylinders are symmetrically installed on the upper plane of the upper template to control the extension of the upper second template and the upper third template; two of the servo electric cylinders are used to control the extension of the upper second template and the upper third template. The lower end of the cylinder passes through the upper template and is fixedly connected to the two sides of the upper three templates. The lower ends of the remaining two servo electric cylinders pass through the upper template and the upper three templates respectively and are fixedly connected to the two sides of the upper two templates; the lower end of the female template is connected to the two sides of the upper end of the lower template through two lower guide pillars on both sides; the middle of the lower end of the lower template is connected to the upper telescopic end of the top cylinder; the lower die punch installation part includes a fixed template, a lower second template, a lower third template, a lower fourth template, a lower fifth template, a lower sixth template and a lower fixed plate, a fixed template, a lower second template, a lower third template, a lower fourth template, a lower fifth template, a lower sixth template and a lower fixed plate, seven templates are slidably installed on the four lower guide pillars from top to bottom in sequence, both sides of the fixed template are fixedly installed on the inner side of the frame, the lower end of the lower fixed plate is fixed on the frame through a fixed bracket, a number of servo electric cylinders are installed on the lower end of the lower fixed plate, and the servo electric cylinders are grouped in two and respectively connected to the corresponding lower second template, lower third template, lower fourth template, lower fifth template or lower sixth template after passing through the template at the upper end; a core rod connecting plate is installed in the middle of the upper end of the lower template.

2. The multi-layer large-tonnage dielectric ceramic filter forming machine according to claim 1, characterized in that: A rectangular slot hole is designed in the middle of the frame and runs through the front and back. A crossbeam is installed near the upper end of the rectangular slot hole. A step is respectively arranged on both sides of the middle of the rectangular slot hole, and both sides of the fixed template are respectively installed on the steps.

3. The multi-layer large-tonnage dielectric ceramic filter forming machine according to claim 2, characterized in that: The lower end of the main oil cylinder is also equipped with a main shaft adjustment mechanism, which includes an anti-rotation plate, a plane on the anti-rotation plate is connected to the lower end of the large piston rod of the main oil cylinder, a guide column is respectively installed at the four corners of the anti-rotation plate, and guide sleeves are respectively installed on the corresponding guide columns on the upper beam, and the upper ends of the guide columns slide in the corresponding guide sleeves; a worm gear assembly is installed at the lower end of the anti-rotation plate, the upper end of the main shaft is located in the middle of the worm wheel, and the outer side of the main shaft is spirally matched with the middle worm wheel of the worm gear assembly; a hole is opened in the middle of the anti-rotation plate for the upper end of the main shaft to pass through, and a hole is also reserved at the lower end of the large piston rod of the main oil cylinder for the top end of the main shaft to extend and retract; the lower end of the main shaft slides through the middle of the crossbeam, and a guide sleeve for the main shaft to slide through is installed on the crossbeam; the lower end of the main shaft is connected to the middle position of the upper end of the upper template.

4. The multi-layer large-tonnage dielectric ceramic filter forming machine according to claim 1, characterized in that: The master oil cylinder comprises a large cylinder body, a large piston head, a large piston rod, a small cylinder body, a small piston head, a small piston rod, a valve seat and a filling valve. A large piston head is slidably installed in the middle of the large cylinder body, one end of the large piston head is connected to the large piston rod, the large piston rod and the large piston head are integrally formed, one end of the large piston rod slides and seals through one end of the large cylinder body, and an inlet and outlet oil passage is designed near the end of the large cylinder body, the outer side of the inlet and outlet oil passage is connected to the outer peripheral surface of the large cylinder body, the inner side of the inlet and outlet oil passage is connected to the interior of the large cylinder body, a circular hole is opened at the other end of the large cylinder body, and a valve seat is installed at the mouth of the circular hole, the middle of the other end of the large piston head is designed as a small cylinder body, a small piston head is slidably installed in the small cylinder body, one end of the small piston head is connected to one end of the small piston rod, the other end of the small piston rod is connected to the inner side of the valve seat, and the filling valve is installed on the outer side of the valve seat; two L-shaped flow passages are designed in the valve seat, One end of the two L-shaped flow channels is connected to the inner end face of the valve seat and the other end is connected to the outer peripheral surface of the valve seat; the small piston rod and the small piston head are integrally formed, and two axial flow channels are designed in the middle of the small piston rod, and both axial flow channels are connected at both ends; one end of one axial flow channel is connected to the end face of the small piston head and the other end is connected to an L-shaped flow channel of the valve seat; one end of the other axial flow channel is blocked with the end face of the small piston head and the other end is connected to another L-shaped flow channel of the valve seat, and at the same time, a radial flow channel is also provided on one side of the axial flow channel, one end of the radial flow channel is connected to the outer side of the root where the small piston rod is connected to the small piston head, and the radial flow channel is connected to the axial flow channel; a valve cavity is opened in the middle of the outer end of the valve seat, and the filling valve is sealed and installed on the valve cavity mouth, one side of the valve cavity is connected to the outer peripheral surface of the valve seat through a main oil inlet flow channel, and the bottom of the valve cavity is connected to the inner end face of the valve seat through two oil channels.

5. The multi-layer large-tonnage dielectric ceramic filter forming machine according to claim 4, characterized in that: The large piston head is in sliding sealing cooperation with the inside of the large cylinder body; the small piston head is in sliding sealing cooperation with the inside of the small cylinder body.

6. The multi-layer large-tonnage dielectric ceramic filter forming machine according to claim 4, characterized in that: The hydraulic oil cylinder also includes a large guide sleeve, a large locking nut, a small guide sleeve, and a small locking nut. The outer peripheral surface of the large cylinder body is designed with a sealing ring groove, and one end of the large cylinder body is designed with an annular step and the inner wall of the annular step is provided with an internal thread. An annular boss is designed on the outer periphery of one end of the large guide sleeve. The large guide sleeve is installed on the inner side of the mouth of the large cylinder body and a sealing ring is installed between the large guide sleeve and the large cylinder body. The sealing ring is located in the sealing ring groove, and the annular boss is pressed on the end face of the annular step. The large locking nut is screwed into the internal thread of the annular step to lock the large guide sleeve; an annular groove is provided on the inner side of one end of the large guide sleeve, and the large piston rod slides through the large guide sleeve. A sealing ring is installed between the large guide sleeve and the large piston rod. In the annular groove; the outer circumferential surface of the small cylinder body is designed with multiple sealing ring grooves, one end of the small cylinder body is designed with an annular step and the inner wall of the annular step is set with an internal thread, one end of the small guide sleeve is designed with an annular boss, the small guide sleeve is installed on the inner side of the mouth of the small cylinder body and a number of sealing rings are installed between the small guide sleeve and the small cylinder body, the several sealing rings are located in the multiple sealing ring grooves, the annular boss is pressed on the end face of the annular step, and the small locking nut is screwed into the internal thread of the annular step to lock the small guide sleeve; a plurality of annular grooves are provided on the inner side of one end of the small guide sleeve, the small piston rod slides through the small guide sleeve, a number of sealing rings are installed between the small guide sleeve and the small piston rod, and the sealing rings are installed in the corresponding annular grooves.

7. The multi-layer large-tonnage dielectric ceramic filter forming machine according to claim 1, characterized in that: The top cylinder is a double-axis extension top cylinder, and a limiting device is installed at the lower end of the lower extension rod of the top cylinder. It includes a push-pull cylinder, a lower pad, a slide rail, an upper pad, and a top cylinder height adjustment mechanism. The top cylinder height adjustment mechanism is installed below the lower extension rod of the top cylinder, and an upper pad is installed at the lower end of the lower extension rod of the top cylinder. The top cylinder height adjustment mechanism includes a support plate, a slide rail is installed on the support plate, and the lower pad is slidably installed on the slide rail. The push-pull cylinder is installed on one side of the support plate, and the telescopic end of the push-pull cylinder is connected to one side of the lower pad. The upper end face of the lower pad is designed to be an upper inclined surface that sinks away from one side of the push-pull cylinder, and the lower end face of the upper pad is designed to be a lower inclined surface, and the lower inclined surface is beveled to match the upper inclined surface; the inclination angle of the upper inclined surface is 4 degrees.

8. The multi-layer large-tonnage dielectric ceramic filter forming machine according to claim 7, characterized in that: A front proximity switch and a rear proximity switch are arranged on one side of the push-pull cylinder, and the front proximity switch and the rear proximity switch are respectively installed on the support plate with a certain distance between them; a transverse plate and a bump block are installed on one side of the lower pad, one end of the transverse plate is installed on one side of the lower pad near the rear end, and the other end of the transverse plate is located on the rear side of the lower pad, and a bump block is installed on the other end of the transverse plate, and the bump block cooperates with the front proximity switch and the rear proximity switch respectively.

9. The multi-layer large-tonnage dielectric ceramic filter forming machine according to claim 7, characterized in that: The top cylinder height adjustment mechanism also includes a worm wheel, a worm, a driving motor, a lifting sleeve, a support sleeve and a support. The support sleeve is installed at the lower end of the support plate, the support is installed at the lower end of the support sleeve, and the lifting sleeve is installed in the support sleeve. The outer side of the lifting sleeve is designed with an external thread, and the inner side of the worm wheel is designed with an internal thread. The worm wheel is rotatably installed on the outer side of the lifting sleeve and the worm wheel can be rotatably located in the middle position of the support sleeve. The worm is rotatably installed on one side of the support sleeve and the worm is meshed with the worm wheel; the driving motor is located on the outer side of the support sleeve and the driving motor drives one end of the worm; a guide column is respectively installed on both sides of the support plate, a connecting plate is installed at the lower end of the lower extension rod of the top cylinder, an upper pad is installed in the middle of the lower end of the connecting plate, and a guide sleeve is designed and installed on both sides of the connecting plate respectively, and the upper ends of the two guide columns are correspondingly slidably installed in the guide sleeve.

10. The multi-layer large-tonnage dielectric ceramic filter forming machine according to claim 1, characterized in that: Upper punches are installed under the upper template, upper third template, upper second template and upper template respectively, and the upper punch of the upper template slides in the middle of the upper punch of the upper three templates, the upper punch of the upper three templates slides in the middle of the upper punch of the upper second templates, and the upper punch of the upper second templates slides in the middle of the upper punch of the upper template; a female template is installed in the middle of the female template; lower punches are installed on the fixed template, lower second templates, lower third templates, lower fourth templates, lower fifth templates, lower sixth templates and lower fixed plate respectively, the lower punch of the lower six templates slides in the middle of the lower punch of the lower five templates, the lower punch of the lower five templates slides in the middle of the lower punch of the lower four templates, the lower punch of the lower four templates slides in the middle of the lower punch of the lower three templates, the lower punch of the lower three templates slides in the middle of the lower punch of the lower two templates, the lower punch of the lower two templates slides in the middle of the lower punch of the fixed template, and the lower punch of the fixed template slides in the middle of the female template.

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