Special elbow for lithium battery powder conveying pipeline system and manufacturing tool

Abstract

The invention discloses a special elbow for a lithium battery powder conveying pipeline system and a manufacturing tool. The special elbow comprises an elbow shell, flanges, a ceramic elbow and an elastic rubber layer, wherein the flanges are arranged at the two ends of the elbow shell, the ceramic elbow is arranged in the elbow shell, an interlayer space is formed between the ceramic elbow and the inner wall of the elbow shell, and the interlayer space between the inner wall of the elbow shell and the outer surface of the ceramic elbow is filled with the elastic rubber layer. The manufacturing tool of the special elbow comprises a rubber pressing die, and the rubber pressing die is arranged on the elbow shell and used for assisting in positioning the elastic receding type auxiliary positioning device at the center position of the ceramic elbow. The lithium battery powder conveying quality is improved, and the working reliability of a lithium battery powder conveying pipeline system is improved.

Description

Technical Field

[0001] The invention relates to the technical field of lithium battery powder conveying, and in particular to a special elbow and manufacturing tooling for a lithium battery powder conveying pipeline system. Background Art

[0002] Lithium battery powder is usually transported by pneumatic conveying. The heavy pipeline of the pneumatic conveying system is the main part of the powder conveying, which mainly includes straight pipes and elbows. During the transportation process, the lithium battery powder will have strong friction with the inner wall of the stainless steel metal pipeline, causing the stainless steel metal pipeline to wear. The worn powder contains iron elements, and the presence of iron elements will reduce the performance of lithium batteries.

[0003] In the prior art, in order to prevent iron particles caused by wear of stainless steel pipelines during lithium battery powder transportation from being brought into the lithium battery powder, ceramic pipelines are usually used for transportation. However, ceramic pipelines have low strength, high brittleness, and poor shock resistance. Pneumatically conveyed ceramic pipelines, especially ceramic elbows, will inevitably be damaged by external forces or the impact and vibration of the conveying air itself, thereby greatly reducing their reliability. Summary of the invention

[0004] In order to solve the above problems, the present invention proposes a special elbow and manufacturing tooling for a lithium battery powder conveying pipeline system, aiming to improve the quality of lithium battery powder conveying and improve the working reliability of the lithium battery powder conveying pipeline system. The specific technical solution is as follows: A special elbow for a lithium battery powder conveying pipeline system, comprising an elbow shell, flanges arranged at both ends of the elbow shell, a ceramic elbow arranged inside the elbow shell and forming an interlayer space between the inner wall of the elbow shell, and an elastic rubber layer filled in the interlayer space between the inner wall of the elbow shell and the outer surface of the ceramic elbow.

[0005] Preferably, the elastic rubber layer fills and extends to the flange planes near the two ends of the elbow shell, and an indentation is provided at the flange plane, thereby forming an indented annular groove on the flange plane, and a ceramic sealing ring is installed in the annular groove.

[0006] The ceramic sealing ring can prevent lithium battery powder from contacting the rubber and the metal surface of the outer shell, and plays a role in end face sealing.

[0007] In order to facilitate manufacturing, the special elbow for lithium battery powder conveying pipeline system of the present invention has process positioning expansion holes at the inner holes of both ends of the ceramic elbow, and the process positioning expansion holes are used for auxiliary positioning when forming the elastic rubber layer.

[0008] Preferably, the process positioning hole expansion is 1 to 3 mm larger than the inner hole diameter of the ceramic elbow.

[0009] Preferably, an elastic retreat type auxiliary positioning device is provided on the elbow shell for keeping the ceramic elbow coaxial with the inner and outer sides of the elbow shell to form an elastic rubber layer of uniform thickness when making the elastic rubber layer. The elastic retreat type auxiliary positioning device includes a number of process bosses arranged on the outer wall of one end of the elbow shell and arranged at intervals along the circumferential direction, a through hole arranged on the process boss, an auxiliary positioning seat fixedly arranged on the process boss, a plunger hole arranged in the auxiliary positioning seat, a plunger movably arranged in the plunger hole and pressed against the end face of the process boss by a spring, and an auxiliary adjustment support screw arranged on the plunger, and the front end of the auxiliary adjustment support screw passes through the through hole on the process boss and presses against the outer surface of the ceramic elbow.

[0010] Preferably, a guide hole is provided on the auxiliary positioning seat, an anti-rotation guide rod is provided on the plunger, and the anti-rotation guide rod is movably provided in the guide hole of the auxiliary positioning seat.

[0011] Preferably, the auxiliary positioning seat is also provided with a locking screw, which can rotate the auxiliary adjustment support screw out after adding materials and before molding, and rotate the locking screw to support the plunger at the same time.

[0012] In the present invention, the components of the elastic retreat auxiliary positioning device are detachable and can be removed after the elastic rubber layer of the special elbow is formed.

[0013] Preferably, the number of the auxiliary adjustment support screws is four and they are evenly spaced along the circumferential direction.

[0014] Preferably, the angle of the special elbow is 60 to 150°.

[0015] Preferably, the back end plane of the flange is parallel to the plane of the flange.

[0016] In order to form a dense elastic rubber layer between the elbow shell and the ceramic elbow by a pressing method, the present invention also includes a rubber die for forming the elastic rubber layer inside the special elbow; the rubber die includes a mold frame, an upper plate arranged at the upper end of the mold frame, a template mounting hole arranged on the upper plate, a flange seat die arranged on the template mounting hole for positioning the outer edge of the flange at one end of the special elbow and the back end face, an intermediate mold ring arranged on the outer edge of the flange at one end of the special elbow and the upper plane, an inner mold core arranged in the process positioning expansion hole at one end of the ceramic elbow, and an extrusion die head arranged in the rubber pressing space between the intermediate mold ring and the inner mold core; wherein the flange seat die is a flange seat die composed of two half joints. The rubber die also includes the elastic yielding auxiliary positioning device arranged on the elbow shell for auxiliary positioning of the center position of the ceramic elbow.

[0017] In order to achieve accurate positioning of the internal ceramic elbow during rubber pressing, the extrusion die head is respectively provided with a positioning outer circle matched with the inner hole of the intermediate die ring and a positioning inner hole matched with the outer circle of the inner mold core. The extrusion die head is also provided with a convex stop for forming an annular groove on the special elbow and an inner stop for matching with the end outer circle and end face clearance of the ceramic elbow.

[0018] In the present invention, the extrusion die head is provided with a central inner hole matched with the outer circle of the inner die core.

[0019] In order to achieve the compression and fixation of the special elbow on the rubber die, the upper plate is provided with studs and nuts for compressing and fixing the middle die ring, the flange seat die, the flange of the elbow shell and the middle die ring in the up and down direction. The flange seat die and the middle die ring are respectively provided with stud holes for passing the studs.

[0020] In order to ensure that there is enough feeding space between the middle mold ring and the inner mold core, the height of the middle mold ring can be set higher.

[0021] In the present invention, the rubber mold also includes a sealing plate for sealing the other end of the special elbow, and the sealing plate is provided with a convex stopper for forming an annular groove on the special elbow during molding, and an external stopper for matching the process positioning expansion hole of the ceramic elbow.

[0022] Preferably, the outer stop of the dead plate is a short stop with a smaller height.

[0023] Preferably, the blocking plate is provided with an extrusion channel for exhausting air and extruding excess rubber material from the inner molding cavity of the rubber compression mold.

[0024] In order to shorten the preheating time of the rubber press for the mold and the special elbow, an infrared radiation heating plate for assisting in preheating the elbow shell is also provided on the mold frame. The infrared radiation heating plate is arranged on the front and rear sides of the elbow shell and is fixed to the mold frame by bolts, which can greatly shorten the preheating time and improve the uniformity of preheating of key parts.

[0025] Furthermore, an infrared radiation heating rod for assisting preheating of the ceramic elbow is also provided on the dull plate. The infrared radiation heating rod is arc-shaped and is inserted into the inner hole of the ceramic elbow.

[0026] Preferably, temperature sensors can also be set on the mold frame and the blanking plate to measure the temperature of the outer surface of the elbow shell and the inner hole of the ceramic elbow respectively, and adjust the heating power of the infrared radiation heating plate and the infrared radiation heating rod when necessary to achieve constant rubber vulcanization temperature.

[0027] Preferably, in order to further improve the density and pressing quality of the middle elastic rubber layer, an extrusion channel opening and closing device for cutting off or connecting the extrusion channel is also provided on the blocking plate of the rubber mold, and the extrusion channel opening and closing device includes a connecting channel provided on the blocking plate and connected to the extrusion channel on the blocking plate, a servo electric push rod provided on the blocking plate, and a telescopic rod provided on the servo electric push rod, the telescopic rod is inserted into the connecting channel, and when the telescopic rod moves forward, a cylindrical section at the front end of the telescopic rod enters the extrusion channel to cut off the extrusion channel, and when the telescopic rod moves backward, a cylindrical section at the front end of the telescopic rod leaves the extrusion channel to connect the extrusion channel.

[0028] Preferably, the temperature sensor, infrared radiation heating plate, infrared radiation heating rod and servo electric push rod are respectively connected to the controller.

[0029] The pressing method of the above-mentioned rubber compression mold is as follows: (1) Installation and positioning: Install the flange at one end of the elbow shell onto the flange seat die of the rubber die, and use studs and nuts to press and fix the flange seat die, the flange of the elbow shell and the intermediate die ring; install the ceramic elbow into the interior of the elbow shell, install a blanking plate with an infrared radiation heating rod on the other end of the elbow shell and fix it with bolts, and position the process positioning expansion hole at the lower end of the ceramic elbow on the outer stop of the blanking plate. The center position of the upper end of the ceramic elbow is adjusted and aligned by an elastic retreat auxiliary positioning device. After it is in place, put the inner core mold into the process positioning expansion hole at the upper end of the ceramic elbow, and then install the extrusion die; (2) Preheating: Turn on the heating system of the press to preheat the rubber mold on the workbench of the press; turn on the infrared radiation heating plate and infrared radiation heating rod for auxiliary heating, so that the rubber mold and special elbow are fully preheated and the preheating time is reduced; (3) Adding materials: Add rubber crumbs into the interlayer space between the inner wall of the elbow shell and the outer surface of the ceramic elbow. After the space is filled, add rubber crumbs into the inner hole of the middle die ring. After the space is in place, position the extrusion die head on the middle die ring so that the central inner hole of the extrusion die head is covered on the outer circle of the inner die core, and the inner stop of the extrusion die head is positioned with the outer circle end face of the ceramic elbow; after the space is in place, rotate the auxiliary adjustment support screw so that the auxiliary adjustment support screw retreats and is out of contact with the ceramic elbow; then rotate the locking screw on the auxiliary positioning seat so that the plunger in the auxiliary positioning seat is pressed against the end face of the process boss; (4) Pressing: Turn on the press to press the extrusion die head down and maintain a certain pressure. After a period of vulcanization, the rubber between the inner wall of the elbow shell and the ceramic elbow is pressed into an elastic rubber layer, and the excess rubber is squeezed out from the extrusion channel of the blanking plate; (5) Mold opening: After cooling, the mold is opened and the components of the elastic retreat auxiliary positioning device on the elbow shell are removed to obtain a special elbow with an intermediate elastic rubber layer.

[0030] The infrared radiation heating plate and the infrared radiation heating rod in the present invention are always turned on during the feeding and pressing process, thereby reducing the problem of insufficient heat of the mold and the special elbow due to heat loss, thereby improving the quality of rubber pressing.

[0031] Preferably, the (4) pressing process is divided into a first stage pressing and a second stage pressing; during the first stage pressing time period, the controller turns on the servo electric push rod, so that a cylindrical section at the front end of the telescopic rod of the servo electric push rod is disengaged from the extrusion channel, and excess rubber is extruded from the extrusion channel of the stuffing plate; during the second stage pressing time period, the controller turns on the servo electric push rod, so that a cylindrical section at the front end of the telescopic rod of the servo electric push rod enters into the extrusion channel, thereby cutting off the extrusion channel and preventing the rubber from being further extruded from the extrusion channel of the stuffing plate, thereby increasing the density and pressing quality of the elastic rubber layer after pressing.

[0032] The beneficial effects of the present invention are: First, the present invention provides a special elbow and manufacturing tooling for a lithium battery powder conveying pipeline system. The special elbow adopts a composite structure of a metal elbow shell and a ceramic elbow, which can avoid the disadvantage that iron ions are introduced into the lithium battery powder due to wear of the conventional metal elbow; and because an elastic rubber layer is provided between the metal elbow shell and the ceramic elbow, the brittle ceramic elbow can be prevented from being damaged due to external force or impact during operation, thereby increasing the working life of the ceramic elbow.

[0033] Second, a special elbow and manufacturing tooling for a lithium battery powder conveying pipeline system of the present invention, in the rubber die of the special elbow, an elastic retreat type auxiliary positioning device is arranged on the process boss of the elbow shell, which can more conveniently adjust the center of the ceramic elbow, and then rely on the internal stop on the extrusion die to perform the main positioning of the ceramic elbow, thereby greatly facilitating the installation of the ceramic elbow; in addition, the auxiliary adjustment support screw in the elastic retreat type auxiliary positioning device can adaptively retreat when there is a slight displacement in the centering positioning of the extrusion die and the ceramic elbow, thereby avoiding brittle fracture of the ceramic elbow caused by rigid over-positioning contact with the auxiliary adjustment support screw when the ceramic elbow is slightly displaced, and plays a role in compensating for adjustment errors when the centering positioning accuracy is insufficient and compensating for thermal deformation displacement of the ceramic elbow during preheating, and has good adaptability.

[0034] Third, the special elbow and manufacturing tooling of a lithium battery powder conveying pipeline system of the present invention are provided with an external infrared radiation heating plate and a built-in infrared radiation heating rod, which can greatly improve the uniformity of heating of the mold and the special elbow, thereby improving the quality of the molded elastic rubber layer and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of a special elbow structure of a lithium battery powder conveying pipeline system of the present invention; Figure 2 It is a structural diagram of a special elbow manufacturing tool (rubber die); Figure 3 yes Figure 2 A partial enlarged schematic diagram of the elastic yielding auxiliary positioning device; Figure 4 yes Figure 2 A partial enlarged schematic diagram of the dull plate part.

[0036] In the figure: 1. elbow shell, 2. flange, 3. ceramic elbow, 4. elastic rubber layer, 5. annular groove, 6. ceramic sealing ring, 7. process positioning expansion hole, 8. elastic retreat type auxiliary positioning device, 9. auxiliary positioning seat, 10. auxiliary adjustment support screw, 11. rubber die, 12. die frame, 13. upper plate, 14. template installation hole, 15. flange seat die, 16. middle die ring, 17. inner die core, 18. extrusion Die head, 19. convex stopper, 20. inner stopper, 21. blocking plate, 22. outer stopper, 23. extrusion channel, 24. infrared radiation heating plate, 25. infrared radiation heating rod, 26. process boss, 27. plunger hole, 28. spring, 29. plunger, 30. anti-rotation guide rod, 31. stud, 32. locking screw, 33. extrusion channel opening and closing device, 34. connecting channel, 35. servo electric push rod, 36. telescopic rod. DETAILED DESCRIPTION

[0037] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0038] like Figures 1 to 4 The figure shows an embodiment of a special elbow for a lithium battery powder conveying pipeline system of the present invention, comprising an elbow shell 1, flanges 2 arranged at both ends of the elbow shell 1, a ceramic elbow 3 arranged inside the elbow shell 1 and forming an interlayer space with the inner wall of the elbow shell 1, and an elastic rubber layer 4 filled in the interlayer space between the inner wall of the elbow shell 1 and the outer surface of the ceramic elbow 3.

[0039] Preferably, the elastic rubber layer 4 fills and extends to the plane of the flange 2 near the two ends of the elbow shell 1, and an indentation is provided at the plane of the flange 2, thereby forming an indented annular groove 5 on the plane of the flange 2, and a ceramic sealing ring 6 is installed in the annular groove 5.

[0040] The ceramic sealing ring 6 can prevent lithium battery powder from contacting the rubber and the metal surface of the housing, and plays a role in end face sealing.

[0041] For the convenience of manufacturing, a special elbow for a lithium battery powder conveying pipeline system in this embodiment has process positioning holes 7 at both ends of the inner holes of the ceramic elbow 3, and the process positioning holes 7 are used for auxiliary positioning when forming the elastic rubber layer 4.

[0042] Preferably, the process positioning expansion hole 7 is larger than the inner hole diameter of the ceramic elbow 3 by 1 to 3 mm.

[0043] Preferably, an elastic retreat type auxiliary positioning device 8 is provided on the elbow shell 1 for keeping the ceramic elbow 3 coaxial with the elbow shell 1 inside and outside to form an elastic rubber layer 4 of uniform thickness when making the elastic rubber layer 4. The elastic retreat type auxiliary positioning device 8 includes a number of process bosses 26 arranged on the outer wall of one end of the elbow shell 1 and arranged circumferentially at intervals, a through hole arranged on the process boss 26, an auxiliary positioning seat 9 fixedly arranged on the process boss 26, a plunger hole 27 arranged in the auxiliary positioning seat 9, a plunger 29 plug movably arranged in the plunger hole 27 and pressed against the end face of the process boss 26 by a spring 28, and an auxiliary adjustment support screw 10 arranged on the plunger 29, and the front end of the auxiliary adjustment support screw 10 passes through the through hole on the process boss 26 and presses against the outer surface of the ceramic elbow 3.

[0044] Preferably, a guide hole is provided on the auxiliary positioning seat 9 , and an anti-rotation guide rod 30 is provided on the plunger 29 . The anti-rotation guide rod 30 is movably provided in the guide hole of the auxiliary positioning seat 9 .

[0045] Preferably, the auxiliary positioning seat 9 is also provided with a locking screw 32 , which can rotate and withdraw the auxiliary adjustment support screw 10 after adding materials and before molding, and simultaneously rotate the locking screw 32 to support the plunger 29 .

[0046] In this embodiment, the components of the elastic retreat auxiliary positioning device 8 are detachable and can be removed after the elastic rubber layer 4 of the special elbow is formed.

[0047] Preferably, the number of the auxiliary adjustment support screws 10 is four and they are evenly spaced along the circumferential direction.

[0048] Preferably, the angle of the special elbow is 60 to 150°.

[0049] Preferably, the back end plane of the flange 2 is parallel to the plane of the flange 2 .

[0050] In order to form a dense elastic rubber layer 4 between the elbow shell 1 and the ceramic elbow 3 by a pressing method, the present embodiment further includes a rubber die 11 for forming the elastic rubber layer 4 inside the special elbow; the rubber die 11 includes a die frame 12, an upper plate 13 arranged at the upper end of the die frame 12, a template mounting hole 14 arranged on the upper plate 13, a flange seat die 15 arranged on the template mounting hole 14 for positioning the outer edge and back end surface of the flange 2 at one end of the special elbow, an intermediate die ring 16 arranged on the outer edge and upper plane of the flange 2 at one end of the special elbow, an inner die core 17 arranged in the process positioning expansion hole 7 at one end of the ceramic elbow 3, and an extrusion die head 18 arranged in the rubber pressing space between the intermediate die ring 16 and the inner die core 17; wherein, the flange seat die 15 is a flange seat die 15 composed of two halves. The rubber die 11 also includes the elastic retreat auxiliary positioning device 8 arranged on the elbow shell 1 for auxiliary positioning of the center position of the ceramic elbow 3.

[0051] In order to achieve accurate positioning of the internal ceramic elbow 3 during rubber pressing, the extrusion die 18 is respectively provided with a positioning outer circle matched with the inner hole of the intermediate die ring 16 and a positioning inner hole matched with the outer circle of the inner mold core 17. The extrusion die 18 is also provided with a convex stop 19 for forming the annular groove 5 on the special elbow and an inner stop 20 for matching the end outer circle and end face clearance of the ceramic elbow 3.

[0052] In this embodiment, the extrusion die head 18 is provided with a central inner hole matched with the outer circle of the inner mold core 17 .

[0053] In order to achieve the compression and fixation of the special elbow on the rubber die 11, the upper plate 13 is provided with studs 31 and nuts for compressing and fixing the middle die ring 116, the flange seat die 15, the flange 2 of the elbow housing 1 and the middle die ring 16 in the up and down direction. The flange seat die 15 and the middle die ring 16 are respectively provided with stud holes for passing the studs 31.

[0054] In order to ensure that there is enough feeding space between the middle mold ring 16 and the inner mold core 17, the height of the middle mold ring 16 can be set higher.

[0055] In this embodiment, the rubber mold 11 also includes a sealing plate 21 for sealing the other end of the special elbow. The sealing plate 21 is provided with a convex stop 19 for forming an annular groove 5 on the special elbow during molding, and an external stop 22 for matching the process positioning expansion hole 7 of the ceramic elbow 3.

[0056] Preferably, the outer stop 22 of the blocking plate 21 is a short stop with a relatively small height.

[0057] Preferably, the stuffing plate 21 is provided with an extrusion channel 23 for exhausting air and extruding excess rubber material from the inner molding cavity of the rubber compression mold 11 .

[0058] In order to shorten the preheating time of the rubber press for the mold and the special elbow, an infrared radiation heating plate 24 for assisting in preheating the elbow shell 1 is also provided on the mold frame 12. The infrared radiation heating plate 24 is arranged on the front and rear sides of the elbow shell 1 and is fixed to the mold frame 12 by bolts, which can greatly shorten the preheating time and improve the uniformity of preheating of key parts.

[0059] Furthermore, an infrared radiation heating rod 25 for assisting in preheating the ceramic elbow 3 is also provided on the stuffy plate 21 . The infrared radiation heating rod 25 is arc-shaped and is inserted into the inner hole of the ceramic elbow 3 .

[0060] Preferably, temperature sensors can also be set on the mold frame 12 and the blocking plate 21 to measure the temperature of the outer surface of the elbow shell 1 and the inner hole of the ceramic elbow 3 respectively, and adjust the heating power of the infrared radiation heating plate 24 and the infrared radiation heating rod 25 when necessary to achieve a constant rubber vulcanization temperature.

[0061] Preferably, in order to further improve the density and pressing quality of the middle elastic rubber layer 4, an extrusion channel opening and closing device 33 for cutting off or connecting the extrusion channel 23 is also provided on the blocking plate of the rubber die 11, and the extrusion channel opening and closing device 33 includes a connecting channel 34 arranged on the blocking plate 21 and connected to the extrusion channel 23 on the blocking plate 21, a servo electric push rod 35 arranged on the blocking plate 21, and a telescopic rod 36 arranged on the servo electric push rod 35, and the telescopic rod 36 is inserted into the connecting channel 34. When the telescopic rod 36 moves forward, a front end section of the cylinder of the telescopic rod 36 enters the extrusion channel 23 to cut off the extrusion channel 23, and when the telescopic rod 36 moves backward, a front end section of the cylinder of the telescopic rod 36 leaves the extrusion channel 23 to connect the extrusion channel 34.

[0062] Preferably, the temperature sensor, the infrared radiation heating plate 24, the infrared radiation heating rod 25 and the servo electric push rod 35 are respectively connected to a controller.

[0063] The pressing method of the above-mentioned rubber die 11 is as follows: (1) Installation and positioning: install and position the flange 2 at one end of the elbow shell 1 on the flange seat die 15 of the rubber die 11, and use studs 31 and nuts to press and fix the flange seat die 15, the flange 2 of the elbow shell 1 and the intermediate die ring 16; install the ceramic elbow 3 into the interior of the elbow shell 1, install the other end of the elbow shell 1 with a blanking plate 21 with an infrared radiation heating rod 25 and fix it with bolts, and position the process positioning expansion hole 7 at the lower end of the ceramic elbow 3 on the outer stop 22 of the blanking plate 21. The center position of the upper end of the ceramic elbow 3 is adjusted and aligned by the elastic retreat auxiliary positioning device 8. After it is in place, put the inner core mold 17 in the process positioning expansion hole 7 at the upper end of the ceramic elbow 3, and then install the extrusion die 18; (2) Preheating: Turn on the heating system of the press so that the rubber die 11 is preheated on the workbench of the press; turn on the infrared radiation heating plate 24 and the infrared radiation heating rod 25 for auxiliary heating so that the rubber die 11 and the special elbow are fully preheated and the preheating time is reduced; (3) Adding materials: Add rubber crumbs into the interlayer space between the inner wall of the elbow shell 1 and the outer surface of the ceramic elbow 3. After the space is filled, add rubber crumbs into the inner hole of the middle die ring 16. After the space is in place, position the extrusion die 18 on the middle die ring 16 so that the central inner hole of the extrusion die 18 is covered on the outer circle of the inner mold core 17, and the inner stop 20 of the extrusion die 18 is positioned with the outer circle end surface of the ceramic elbow 3; after the space is in place, rotate the auxiliary adjustment support screw 10 so that the auxiliary adjustment support screw 10 retreats and is out of contact with the ceramic elbow 3; then rotate the locking screw 32 on the auxiliary positioning seat 9 so that the plunger 29 in the auxiliary positioning seat 9 is pressed against the end surface of the process boss 26; (4) Pressing: The press machine is turned on to press the extrusion die 18 downward and maintain a certain pressure. After a period of vulcanization, the rubber material between the inner wall of the elbow shell 1 and the ceramic elbow 3 is pressed into an elastic rubber layer 4, and the excess rubber material is squeezed out from the extrusion channel 23 of the blocking plate 21; (5) Mold opening: After cooling, the mold is opened and the components of the elastic retreat auxiliary positioning device 8 on the elbow shell 1 are removed to obtain a special elbow with an intermediate elastic rubber layer 4.

[0064] The infrared radiation heating plate 24 and the infrared radiation heating rod 25 in this embodiment are always turned on during the feeding and pressing process, thereby reducing the problem of insufficient heat of the mold and the special elbow due to heat loss, thereby improving the quality of rubber pressing.

[0065] Preferably, the (4) pressing process is divided into a first stage pressing and a second stage pressing; during the first stage pressing time period, the controller turns on the servo electric push rod 35, so that a cylindrical section at the front end of the telescopic rod of the servo electric push rod 35 is disengaged from the extrusion channel 23, and excess rubber is extruded from the extrusion channel 23 of the stuffing plate 21; during the second stage pressing time period, the controller turns on the servo electric push rod 35, so that a cylindrical section at the front end of the telescopic rod of the servo electric push rod 35 enters into the extrusion channel 23, thereby cutting off the extrusion channel 23 and preventing the rubber from being further extruded from the extrusion channel 23 of the stuffing plate 21, thereby increasing the density and pressing quality of the elastic rubber layer 4 after pressing.

[0066] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A special elbow for lithium battery powder conveying pipeline system, characterized in that: It includes an elbow shell, flanges arranged at both ends of the elbow shell, a ceramic elbow arranged inside the elbow shell and forming an interlayer space with the inner wall of the elbow shell, and an elastic rubber layer filled in the interlayer space between the inner wall of the elbow shell and the outer surface of the ceramic elbow.

2. The special elbow for lithium battery powder conveying pipeline system according to claim 1, characterized in that: The elastic rubber layer fills and extends to the flange planes close to the two ends of the elbow shell, and an indentation is provided at the flange plane, so as to form an indented annular groove on the flange plane, and a ceramic sealing ring is installed in the annular groove.

3. The special elbow for lithium battery powder conveying pipeline system according to claim 1, characterized in that: Process positioning holes are provided at the inner holes at both ends of the ceramic elbow, and the process positioning holes are used for auxiliary positioning when forming the elastic rubber layer.

4. The special elbow for lithium battery powder conveying pipeline system according to claim 3, characterized in that: An elastic retreat type auxiliary positioning device is provided on the elbow shell for keeping the ceramic elbow coaxial with the inner and outer sides of the elbow shell to form an elastic rubber layer of uniform thickness when making the elastic rubber layer. The elastic retreat type auxiliary positioning device includes a number of process bosses arranged on the outer wall of one end of the elbow shell and arranged at intervals along the circumferential direction, a through hole arranged on the process boss, an auxiliary positioning seat fixedly arranged on the process boss, a plunger hole arranged in the auxiliary positioning seat, a plunger movably arranged in the plunger hole and pressed against the end face of the process boss by a spring, and an auxiliary adjustment support screw arranged on the plunger. The front end of the auxiliary adjustment support screw passes through the through hole on the process boss and presses against the outer surface of the ceramic elbow.

5. The special elbow for lithium battery powder conveying pipeline system according to claim 1, characterized in that: The back end plane of the flange is parallel to the plane of the flange.

6. The tooling for manufacturing a special elbow for a lithium battery powder conveying pipeline system according to claim 1, characterized in that: It comprises a rubber die for forming an elastic rubber layer inside the special elbow; the rubber die comprises a die frame, an upper plate arranged at the upper end of the die frame, a template mounting hole arranged on the upper plate, a flange seat die arranged on the template mounting hole for positioning the outer edge of the flange at one end and the back end face of the special elbow, an intermediate die ring arranged on the outer edge of the flange at one end of the special elbow and the upper plane, an inner die core arranged in the process positioning expansion hole at one end of the ceramic elbow, and an extrusion die head arranged in the rubber pressing space between the intermediate die ring and the inner die core; wherein, the flange seat die is a flange seat die composed of two half molds.

7. The tooling for manufacturing a special elbow for a lithium battery powder conveying pipeline system according to claim 6, characterized in that: The extrusion die head is respectively provided with a positioning outer circle matched with the inner hole of the middle die ring and a positioning inner hole matched with the outer circle of the inner die core. The extrusion die head is also provided with a convex stop for forming an annular groove on the special elbow and an inner stop for matching with the end outer circle and end face clearance of the ceramic elbow.

8. The tooling for manufacturing a special elbow for a lithium battery powder conveying pipeline system according to claim 6, characterized in that: The rubber die also includes a sealing plate for sealing the other end of the special elbow, and the sealing plate is provided with a convex stopper for forming an annular groove on the special elbow during molding, and an outer stopper for matching the process positioning expansion hole of the ceramic elbow.

9. The tooling for manufacturing a special elbow for a lithium battery powder conveying pipeline system according to claim 6, characterized in that: An infrared radiation heating plate for assisting in preheating the elbow shell is also provided on the mold frame, and the infrared radiation heating plate is arranged at the front and rear sides of the elbow shell.

10. The tooling for manufacturing a special elbow for a lithium battery powder conveying pipeline system according to claim 6, characterized in that: The stuffy plate is also provided with an infrared radiation heating rod for assisting in preheating the ceramic elbow. The infrared radiation heating rod is arc-shaped and is inserted into the inner hole of the ceramic elbow.

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