PTFE (Polytetrafluoroethylene) pre-sintered material preparation device

Abstract

The invention relates to the technical field of PTFE preparation devices, and particularly discloses a PTFE pre-sintered material preparation device which comprises a conveying table. The PTFE presintered material preparation device comprises a conveying table, a forming mold, an infrared moisture meter, compression forming equipment, sintering forming equipment and a guide mechanism, the compression forming equipment is located on the surface of the conveying table, the sintering forming equipment is located on the outer side of the conveying table, and the guide mechanism is located on the inner wall of the forming mold. Raw material powder in a mold is preliminarily compacted through arranged compression molding equipment, and whether an infrared moisture meter is controlled to be started or not can be randomly selected when the compression molding equipment carries out mold pressing work every time, so that the infrared moisture meter carries out random sampling detection on a to-be-compacted molding mold; a heating airflow channel is formed in the bottom of the forming die through the guide mechanism, heating airflow in the sintering forming equipment heats the bottom of a compacted blank in the forming die through the guide mechanism, and heat lag of the bottom of the blank in the forming die is relieved.

Description

Technical Field

[0001] The invention relates to the technical field of PTFE preparation devices, in particular to a PTFE pre-sintered material preparation device. Background Art

[0002] PTFE is a polymer material made from tetrafluoroethylene monomer through polymerization reaction, and PTFE pre-sintered material is a semi-molten material of polytetrafluoroethylene (PTFE) resin that has been pretreated before sintering. It has good plasticity and processing fluidity and is often used in subsequent molding processes such as molding and extrusion.

[0003] The pre-sintered material preparation device is a device used to complete the conversion of PTFE resin from powder raw materials to pre-sintered materials. By precisely controlling temperature, pressure and time, the PTFE powder particles are initially bonded in an incompletely molten state to form a pre-sintered material with a certain strength and uniformity.

[0004] When preparing PTFE pre-sintered materials, the staff first fills the dried PTFE powder into a metal mold and applies pressure through a hydraulic press to initially compact the powder; then the mold is placed in a sintering furnace for heating. The heating process is divided into two stages: low-temperature stage: heating to 200-250℃ at a rate of 5-10℃ / min to eliminate residual volatiles (such as extrusion aids); high-temperature stage: continuing to heat to 310-320℃ (close to but below the melting point) and keeping warm for 2-4 hours (adjusted according to the thickness of the blank) so that the PTFE molecular chains obtain sufficient kinetic energy at high temperature, the interface between the particles gradually disappears, and a continuous phase is formed through physical entanglement, but it is not completely melted (complete melting temperature >327℃); after the pre-sintering is completed, the heating system is turned off, and the material is allowed to slowly cool down to below 150℃ at a rate of 10-20℃ / h in the furnace, and then the mold is removed. The cooled pre-sintered material is removed from the mold to form a block or plate-shaped blank.

[0005] Before filling the dried PTFE powder into the metal mold, the staff will test the moisture content of the powder. The moisture content test generally uses offline sampling (such as only testing one sample per batch). However, in large-scale production, if the sample is not taken from the moist area in the center of the pile, it is easy to miss the material exceeding the standard.

[0006] When the moisture content of the material exceeds the specified value, the evaporation of water during the sintering heating process requires a large amount of latent heat (the heat of vaporization of water is approximately 2260 kJ / kg). As a result, the actual temperature of the material area is lower than the set furnace temperature. This causes uneven heating of the material at different locations in the same furnace. Some areas are not fully sintered, while others are overheated and decompose due to heat accumulation. In addition, the excessive moisture content causes a large number of bubbles to form inside the material during sintering. As poor conductors of heat (the thermal conductivity of air is only 0.026 W / m·K), bubbles will hinder heat conduction within the material, increase the temperature difference between the inside and outside of the material, and affect the quality of PTFE pre-sintered material preparation. To this end, we propose a PTFE pre-sintered material preparation device. Summary of the Invention

[0007] The object of the present invention is to provide a PTFE pre-sintered material preparation device to solve the problems affecting the preparation quality of PTFE pre-sintered material raised in the above background technology.

[0008] To achieve the above-mentioned object, the present invention provides the following technical solution: a PTFE pre-sintering material preparation device, comprising a conveying platform; further comprising a forming mold, the forming mold being placed in a carrying area of ​​the conveying platform, and the conveying platform transporting the forming mold placed in the carrying area; an infrared moisture meter, the infrared moisture meter being mounted on the surface of the conveying platform, and detecting the moisture content of the PTFE powder in the forming mold;

[0009] The pressing and molding equipment is located on the surface of the conveying platform. The pressing and molding equipment preliminarily presses the PTFE powder in the molding die into shape. When the pressing and molding equipment presses the PTFE powder in the molding die, the pressing and molding equipment controls the infrared moisture meter to randomly sample and detect the moisture content of the PTFE powder in different molding die;

[0010] The sintering molding equipment is located outside the conveying platform. The sintering molding equipment sintering the powder in the molding die that has been preliminarily compacted, and the sintering molding equipment detects the moisture content in the gas emitted from each molding die when heating the molding die.

[0011] The guiding mechanism is located on the inner wall of the forming mold. After the sintering molding equipment detects that the moisture content in the gas dissipated from the forming mold exceeds a predetermined value, the guiding mechanism forms a heating air flow channel at the bottom of the forming mold. The heated air flow in the sintering molding equipment heats the bottom of the compacted blank in the forming mold through the guiding mechanism, thereby alleviating the thermal lag at the bottom of the blank in the forming mold.

[0012] Among them, the pressing and forming equipment includes a mounting seat, which is fixed on the surface of the conveyor platform. A hydraulic press is installed on the surface of the mounting seat. A pressure plate is fixedly connected to the output end of the hydraulic press. The four corners of the pressure plate are fixedly connected to limit rods. The limit rods are slidably connected to the inner wall of the mounting seat. A control component for controlling the intermittent operation of the infrared moisture meter is provided on the surface of the mounting seat.

[0013] Among them, the control component includes a control box installed on the surface of the mounting seat, and the inside of the control box is a control compartment and a transmission compartment. A plurality of support columns are fixedly connected to the inner wall of the control compartment, and the plurality of support columns are spaced 60° apart. Control switches are installed on the top of some support columns, and the plurality of control switches are spaced 120° apart. The control switch is connected to the infrared moisture meter. A reset spring is provided on the outside of the support column, and one end of the reset spring is fixed to the inner wall of the control compartment, and the other end of the reset spring is fixedly connected to a trigger plate, which is slidably connected to the inner wall of the control compartment. A trigger component is provided on the inner wall of the control box, which randomly presses a trigger plate each time the limit rod descends.

[0014] Among them, the trigger part includes a transmission rod rotatably connected to the inner wall of the control box, the transmission rod is located at one end of the control compartment and is fixedly connected to a swing arm, a connecting hole is opened on the inner wall of the swing arm, and a ball is provided on the inner wall of the connecting hole, and the ball can roll and slide on the inner wall of the connecting hole, the transmission rod is located at one end of the transmission compartment and is fixedly connected to the fan blade, a nozzle is installed on the inner wall of the transmission compartment, and the nozzle is arranged obliquely, an air pipe is fixedly connected to the outside of the control box, and the air pipe is connected to the nozzle, one of the limit rods is fixedly connected to the outside of the piston plate, and a sealing box is fixedly connected to the surface of the mounting seat, the piston plate is slidably connected to the inner wall of the sealing box, and the air pipe is connected to the bottom of the sealing box.

[0015] Among them, the sintering molding equipment includes a sintering molding furnace, which is located outside the conveying platform. The inner wall of the sintering molding furnace is provided with multiple placement bins, and the placement bins are used to place the molding molds that have been preliminarily compacted. The side walls of the placement bins are fixedly connected with multiple air ducts, and the air ducts are connected to the air ducts in the sintering molding furnace. The inner wall of the sintering molding furnace is provided with multiple detection parts for detecting the moisture content of the exhaust gas. The detection parts control the connectivity of the air ducts according to the detection results, and multiple detection parts correspond to each placement bin.

[0016] Among them, the detection part includes a heat-insulating box located on the inner wall of the sintering molding furnace. The interior of the heat-insulating box is divided into a collecting bin and a detection bin. The collecting bin is connected to the placement bin. An exhaust fan is installed on the inner wall of the collecting bin. When the exhaust fan is working, it guides the airflow passing through the molding mold in the sintering molding furnace into the collecting bin. A water-absorbing part is provided on the inner wall of the detection bin. The water-absorbing part absorbs the moisture in the guided airflow. A transmission part is provided on the inner wall of the detection bin. The transmission part is connected to the water-absorbing part. When the moisture absorbed by the water-absorbing part per unit time exceeds a predetermined value, the transmission part controls the air guide pipe to be in a connected state.

[0017] Among them, the water absorbing part includes a collecting bottle located in the detection chamber, a fixed plate is fixedly connected to the bottom of the collecting bottle, the fixed plate is slidably connected to the inner wall of the detection chamber, a compression spring is fixedly connected to the bottom of the fixed plate, and the compression spring is fixedly connected to the inner wall of the detection chamber at one end away from the fixed plate. An air inlet pipe and an exhaust pipe are connected to the collecting bottle, the air inlet pipe is connected to the collecting chamber, concentrated sulfuric acid solution is stored in the collecting bottle, the air inlet pipe is located below the liquid level of the concentrated sulfuric acid solution, and the exhaust pipe is located above the liquid level of the concentrated sulfuric acid solution.

[0018] The transmission gear is connected with the gear train of the transmission gear and the transmission gear is connected with the gear train of the transmission gear and the transmission gear is connected with the gear train of the transmission gear.

[0019] Among them, the guiding mechanism includes a plurality of air guide grooves opened at the bottom of the forming mold. When the forming mold is placed in the placement bin, each air guide groove corresponds to the air guide pipe port in the placement bin. The inner wall of the air guide groove is slidably connected with a closing plate, the closing plate is slidably connected to the inner wall of the air guide groove, the bottom of the closing plate is fixedly connected with a spring sheet 2, the spring sheet 2 is fixed to the bottom of the air guide groove, the bottom of the closing plate is fixedly connected with an inclined block, the outer side of the inclined block is slidably connected with a push block, the push block is slidably connected to the inner wall of the air guide groove, the outer side of the push block is fixedly connected with a compression spring 3, the bottom of the closing plate is slidably connected with a stabilizing block, the outer side of the stabilizing block is fixedly connected with a spring sheet 3, the stabilizing block is trapezoidal near one end of the push block, and a trapezoidal groove is opened on the side of the push block near the stabilizing block.

[0020] Among them, an O-type plug is fixedly connected to the outside of the air guide groove, and the O-type plug can be inserted into the air guide pipe port. The O-type plug is made of stainless steel and has a corrugated surface.

[0021] The present invention has at least the following beneficial effects:

[0022] 1. When the present application is in use, the raw material powder in the mold is preliminarily compacted by the set pressing and molding equipment, and each time the pressing and molding equipment performs a molding operation, it will randomly choose whether to control the infrared moisture meter to start, so that the infrared moisture meter can perform random sampling inspection on the molding mold to be compacted, reducing the workload of the staff, reducing manual interference in the sampling and detection links, and obtaining more representative data.

[0023] 2. The powder in the molding die that has been preliminarily compacted is sintered and molded by the set sintering molding equipment, and the sintering molding equipment detects the moisture content in the gas dissipated from each molding die when heating the molding die. When the moisture content exceeds a predetermined value, a heating air flow channel is formed at the bottom of the molding die through the guiding mechanism. The heated air flow in the sintering molding equipment heats the bottom of the compacted blank in the molding die through the guiding mechanism, thereby alleviating the thermal lag at the bottom of the blank in the molding die. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0025] Figure 2 This is a schematic structural diagram of the compression molding equipment of the present invention;

[0026] Figure 3 This is a schematic cross-sectional view of the control box structure of the present invention;

[0027] Figure 4 It is a top cross-sectional schematic diagram of the control box structure of the present invention;

[0028] Figure 5 This is a schematic structural diagram of the sintering molding equipment of the present invention;

[0029] Figure 6 This is a schematic diagram of the structure of a single storage bin of the present invention;

[0030] Figure 7 It is a rear cross-sectional schematic diagram of the heat insulation box structure of the present invention;

[0031] Figure 8 This is a schematic diagram of the structure of the detection element of the present invention;

[0032] Figure 9 This is a schematic front view of the connection relationship between the friction block and the transmission wheel of the structure of the present invention;

[0033] Figure 10 This is a schematic diagram of the transmission structure of the present invention;

[0034] Figure 11 This is a schematic diagram of the position of the air guide groove in the forming mold of the present invention;

[0035] Figure 12 This is a schematic structural diagram of the guiding mechanism of the present invention;

[0036] Figure 13 This is a schematic diagram of the connection relationship between the trapezoidal groove and the stabilizing block of the present invention.

[0037] In the figure: 1. conveyor platform; 2. forming mold; 3. infrared moisture meter; 4. pressing molding equipment; 40. mounting base; 41. hydraulic press; 42. pressing plate; 43. limit rod; 44. control component; 45. control box; 46. control chamber; 47. transmission chamber; 48. support column; 49. control switch; 410. return spring; 411. trigger plate; 412. trigger component; 413. transmission rod; 414. swing arm; 415. connecting hole; 416. ball bearing; 417. fan blade; 418. nozzle; 419. air pipe; 420. piston plate; 421. sealing box; 5. sintering molding equipment; 50. sintering molding furnace; 51. placement chamber; 52. air guide tube; 53. detection component; 54. heat insulation box; 55. collection chamber; 56. detection chamber; 57. exhaust fan; 58. Water absorbing part; 59. Transmission part; 510. Collecting bottle; 511. Fixed plate; 512. Compression spring 1; 513. Inlet pipe; 514. Exhaust pipe; 515. Tooth plate; 516. Transmission gear 1; 517. Rotating shaft 1; 518. Transmission gear 2; 519. Transmission gear 3; 520. Rotating shaft 2; 521. Transmission wheel; 522. Winding ring; 523. Friction block; 524. Spring leaf 1; 525. Fiber rope; 526. Trigger block; 527. Compression spring 2; 528. Solenoid valve; 529. Travel switch; 6. Guide mechanism; 60. Air guide groove; 61. Closing plate; 62. Spring leaf 2; 63. Inclined block; 64. Push block; 65. Compression spring 3; 66. Stabilizing block; 67. Spring leaf 3; 68. Trapezoidal groove; 7. O-type plug. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] Example 1

[0040] See also Figures 1 to 13The present invention provides a technical solution: a PTFE pre-sintering material preparation device, including a conveying platform 1; also including a forming mold 2, the conveying platform 1 transports the forming mold 2 on the surface; an infrared moisture meter 3, the infrared moisture meter 3 is installed on the surface of the conveying platform 1, and the infrared moisture meter 3 detects the moisture content of the PTFE powder in the forming mold 2; a pressing molding device 4, the pressing molding device 4 is located on the surface of the conveying platform 1, and the pressing molding device 4 preliminarily presses the PTFE powder in the forming mold 2 into shape, and the pressing molding device 4 controls the infrared moisture meter 3 to randomly sample and detect the forming mold 2 when pressing the PTFE powder in the forming mold 2; a sintering molding device Preparation 5, the sintering molding equipment 5 is located outside the conveying platform 1, the sintering molding equipment 5 will sinter the powder in the molding mold 2 that has been preliminarily compacted, and the sintering molding equipment 5 detects the water content in the dissipated gas of each molding mold 2 when heating the molding mold 2; the guiding mechanism 6, the guiding mechanism 6 is located on the inner wall of the molding mold 2, after the sintering molding equipment 5 monitors that the water content in the dissipated gas of the molding mold 2 exceeds a predetermined value, the guiding mechanism 6 forms a heating air flow channel at the bottom of the molding mold 2, and the heated air flow in the sintering molding equipment 5 heats the bottom of the compacted blank in the molding mold 2 through the guiding mechanism 6, thereby alleviating the thermal lag at the bottom of the blank in the molding mold 2.

[0041] During use, the staff puts the PTFE powder to be processed into the forming mold 2, and sends the forming mold 2 to the bottom of the infrared moisture meter 3 through the conveyor belt mechanism on the surface of the conveyor platform 1. The infrared moisture meter 3 is an instrument that uses infrared radiation technology to quickly measure the moisture content in a substance. The core principle is based on the absorption characteristics of moisture to infrared light of a specific wavelength, so that the moisture content of the powder passing through the forming mold 2 is detected by the infrared moisture meter 3. The moisture content of the PTFE pre-sintered material is generally required to be ≤0.03%~0.04%. The forming mold 2 detected by the infrared moisture meter 3 is moved to the pressing and molding equipment 4 under the transmission of the conveyor platform 1. The raw material powder in the mold is preliminarily compacted by the set pressing and molding equipment 4, and each time the pressing and molding equipment 4 performs a pressing operation, it will randomly choose whether to control the infrared moisture meter 3 to start, so that the infrared moisture meter 3 performs random sampling and detection on the forming mold 2 to be compacted, reducing the workload of the staff and reducing manual interference in the sampling and detection link. , to obtain more representative data, compared with the infrared moisture meter 3 which is always on to detect each forming mold 2 that passes through, it reduces invalid detection time and increases production capacity. If the staff finds that the PTFE powder in this batch of forming molds 2 is repeatedly detected to have a moisture content exceeding the standard, the sintering of this batch of PTFE powder can be suspended, and the PTFE powder can be re-dried. After the pressing molding equipment 4 preliminarily compacts the raw material powder in the forming mold 2, the staff transfers the forming mold 2 to the sintering molding equipment 5, and the sintering molding equipment 5 is used to sinter the powder in the forming mold 2 that has been preliminarily compacted. In addition, the sintering molding equipment 5 detects the moisture content in the dissipated gas of each forming mold 2 when heating the forming mold 2. When the moisture content exceeds a predetermined value, a heating air flow channel is formed at the bottom of the forming mold 2 through the guiding mechanism 6. The heated air flow in the sintering molding equipment 5 heats the bottom of the compacted blank in the forming mold 2 through the guiding mechanism 6, thereby alleviating the thermal lag at the bottom of the blank in the forming mold 2.

[0042] The pressing and forming equipment 4 includes a mounting base 40, which is fixed on the surface of the conveying platform 1. A hydraulic press 41 is installed on the surface of the mounting base 40. The output end of the hydraulic press 41 is fixedly connected to a pressure plate 42. The four corners of the pressure plate 42 are respectively fixedly connected to limit rods 43. The limit rods 43 are slidably connected to the inner wall of the mounting base 40. A control part 44 for controlling the intermittent operation of the infrared moisture meter 3 is provided on the surface of the mounting base 40.

[0043] When the raw material powder in the forming mold 2 is initially compacted, the hydraulic press 41 works to push the pressing plate 42 into the forming mold 2, thereby compacting the powder in the forming mold 2. When the pressing plate 42 moves downward, the pressing plate 42 drives the four limit rods 43 to slide on the inner wall of the mounting seat 40. The movement of the limit rods 43 drives the control part 44 to work, so that each time the limit rod 43 moves downward in the vertical direction, it will choose whether to control the infrared moisture meter 3 to work, so that the infrared moisture meter 3 intermittently detects the forming mold 2 on the conveying platform 1.

[0044] The control component 44 includes a control box 45 installed on the surface of the mounting base 40. The interior of the control box 45 is a control compartment 46 and a transmission compartment 47. A plurality of support columns 48 are fixedly connected to the inner wall of the control compartment 46. The plurality of support columns 48 are spaced 60° apart. A control switch 49 is installed on the top of some of the support columns 48. The plurality of control switches 49 are spaced 120° apart. The control switch 49 is connected to the infrared moisture meter 3. A return spring 410 is provided on the outside of the support column 48. One end of the return spring 410 is fixed to the inner wall of the control compartment 46. The other end of the return spring 410 is fixedly connected to a trigger plate 411. The trigger plate 411 is slidably connected to the inner wall of the control compartment 46. The inner wall of the control box 45 is provided with a trigger component 412 that randomly presses a certain trigger plate 411 each time the limit rod 43 descends.

[0045] The control switch 49 is a normally open switch. A normally open switch is a type of switch in which the contacts are in an open state under normal conditions (no external force). When external force is applied, the contacts will close, thereby connecting the circuit. Multiple control switches 49 are set in parallel.

[0046] When the limit rod 43 moves in the vertical direction, the limit rod 43 drives the trigger member 412 to work, and the trigger member 412 randomly presses one of the six trigger plates 411, so that the pressed trigger plate 411 squeezes the return spring 410. If there is a control switch 49 under the pressed trigger plate 411, the control switch 49 will be triggered, so that the infrared moisture meter 3 will detect the next passing forming mold 2; if there is no control switch 49 under the pressed trigger plate 411, the infrared moisture meter 3 will not work when the next uncompacted forming mold 2 passes by the infrared moisture meter 3.

[0047] The trigger member 412 includes a transmission rod 413 rotatably connected to the inner wall of the control box 45. The transmission rod 413 is located at one end of the control compartment 46 and is fixedly connected to a swing arm 414. A connecting hole 415 is provided on the inner wall of the swing arm 414. A ball 416 is provided on the inner wall of the connecting hole 415. The ball 416 can roll and slide on the inner wall of the connecting hole 415. The transmission rod 413 is located at one end of the transmission compartment 47 and is fixedly connected to a fan blade 417. A nozzle 418 is installed on the inner wall of the transmission compartment 47. The nozzle 418 is arranged obliquely. An air supply pipe 419 is fixedly connected to the outside of the control box 45, and the air supply pipe 419 is connected to the nozzle 418. A piston plate 420 is fixedly connected to the outside of one of the limit rods 43. A sealing box 421 is fixedly connected to the surface of the mounting seat 40. The piston plate 420 is slidably connected to the inner wall of the sealing box 421, and the air supply pipe 419 is connected to the bottom of the sealing box 421.

[0048] When the limiting rod 43 moves downward in the vertical direction, the limiting rod 43 drives the piston plate 420 to slide on the inner wall of the sealing box 421, thereby injecting the gas in the sealing box 421 into the nozzle 418 through the gas pipe 419, and the nozzle 418 guides the air flow to spray toward the fan blade 417, so that the fan blade 417 drives the transmission rod 413 to rotate, the transmission rod 413 drives the swing arm 414 to rotate, and the swing arm 414 drives the ball 416 to move together, so that the ball 416 can rotate in the connecting hole 415 and move in the vertical direction, and the ball Under the pressure of its own gravity, 416 will push the trigger plate 411 below it to move on the inner wall of the control chamber 46. Since the distance and angle between the fan blade 417 and the nozzle 418 are inconsistent each time the fan blade 417 rotates and stops, the rotation angle of the fan blade 417 pushed by the airflow is also inconsistent each time. That is, the pressed trigger plate 411 cannot be manually intervened, so that the infrared moisture meter 3 can perform random sampling inspection on the forming mold 2 to be compacted, reducing the workload of the staff, reducing manual interference in the sampling inspection link, and obtaining more representative data.

[0049] The sintering molding equipment 5 includes a sintering molding furnace 50, which is located outside the conveying platform 1. The inner wall of the sintering molding furnace 50 is provided with multiple placement bins 51, and the placement bins 51 are used to place the molding molds 2 that have been preliminarily compacted. The side walls of the placement bins 51 are fixedly connected with multiple air ducts 52, and the air ducts 52 are connected to the air ducts in the sintering molding furnace 50. The inner wall of the sintering molding furnace 50 is provided with multiple detection parts 53 for detecting the moisture content of the exhaust gas. The detection parts 53 control the connectivity of the air ducts 52 according to the detection results, and multiple detection parts 53 correspond to each placement bin 51.

[0050] The sintering molding furnace 50 is the core equipment for preparing PTFE pre-sintered materials in the existing technology. It realizes the melting and molding of powder particles by precisely controlling the temperature curve and sintering process. Its working principle is to send heated inert gas (such as nitrogen) into the furnace cavity through a fan, and use the convection heat exchange between the hot air flow and the material to achieve heating.

[0051] After the PTFE raw material powder in the forming mold 2 is pressed into a blank, the staff transfers the forming mold 2 to the placement bin 51 in the sintering molding furnace 50. After the placement is completed, the sintering molding furnace 50 is closed. The sintering molding furnace 50 sends the heated inert gas into the furnace cavity, and uses the convection heat exchange between the hot air flow and the material to achieve heating. When the heated inert gas passes through the blank surface of the forming mold 2, the heat is transferred to the PTFE blank through heat conduction, so that the residual water inside the blank is heated to the boiling point and evaporated into water vapor. The flowing inert gas forms an airflow on the surface of the blank. The evaporated water vapor is promptly brought out of the system through convection to avoid moisture accumulation inside or around the blank, and the detection component 53 detects the moisture content in the air flow passing through the blank in each placement bin 51. The detection component 53 controls the connectivity of the air duct 52 according to the detection result, so that when the moisture content of the blank in the forming mold 2 is high, the air duct 52 introduces the inert gas heated in the sintering furnace 50 into the forming mold 2, and heats the bottom of the compacted blank in the forming mold 2 through the guiding mechanism 6 at the bottom of the forming mold 2, thereby alleviating the thermal lag of the bottom of the blank in the forming mold 2.

[0052] The detection component 53 includes an insulation box 54 located on the inner wall of the sintering molding furnace 50. The interior of the insulation box 54 is divided into a collecting bin 55 and a detection bin 56. The collecting bin 55 is connected to the placement bin 51. An exhaust fan 57 is installed on the inner wall of the collecting bin 55. When the exhaust fan 57 is working, it guides the airflow passing through the molding mold 2 in the sintering molding furnace 50 into the collecting bin 55. A water absorbent component 58 is provided on the inner wall of the detection bin 56. The water absorbent component 58 absorbs moisture in the guided airflow. A transmission component 59 is provided on the inner wall of the detection bin 56. The transmission component 59 is connected to the water absorbent component 58. When the moisture absorbed by the water absorbent component 58 per unit time exceeds a predetermined value, the transmission component 59 controls the air guide pipe 52 to be in a connected state.

[0053] When the detection part 53 is working, the air flow in the placement bin 51 passing through the blank in the forming mold 2 is sucked into the collection bin 55 through the exhaust fan 57. The gas in the collection bin 55 is discharged into the gas treatment area in the sintering molding furnace 50 after passing through the water absorbing part 58. When the moisture absorbed by the water absorbing part 58 per unit time exceeds a predetermined value, the transmission part 59 controls the air guide pipe 52 to be in a connected state. Since the heated inert gas will take away the moisture of the blank when passing through the surface of the blank, when the gas with moisture passes through the water absorbing part 58, under the condition that the flow area and speed remain unchanged, the predetermined value is the moisture absorbed by the gas entering the water absorbing part 58 per unit time (such as within 1 second) when the moisture content of the blank in the forming mold 2 is 0.04%.

[0054] The water absorbing component 58 includes a collecting bottle 510 located in the detection chamber 56, and a fixing plate 511 is fixedly connected to the bottom of the collecting bottle 510, and the fixing plate 511 is slidably connected to the inner wall of the detection chamber 56. A compression spring 512 is fixedly connected to the bottom of the fixing plate 511, and the compression spring 512 is fixedly connected to the inner wall of the detection chamber 56 at one end away from the fixing plate 511. An air inlet pipe 513 and an exhaust pipe 514 are connected to the collecting bottle 510, and the air inlet pipe 513 is connected to the collecting chamber 55. Concentrated sulfuric acid solution is stored in the collecting bottle 510, and the concentrated sulfuric acid solution can absorb moisture in the high-temperature gas. The air inlet pipe 513 is located below the liquid level of the concentrated sulfuric acid solution, and the exhaust pipe 514 is located above the liquid level of the concentrated sulfuric acid solution.

[0055] The gas guided by the exhaust fan 57 passes through the air inlet pipe 513 and is collected in the bottle 510. The air inlet pipe 513 guides the gas under the concentrated sulfuric acid solution, and the concentrated sulfuric acid solution absorbs the moisture in the gas, and the remaining gas is discharged into the gas treatment area in the sintering molding furnace 50 through the exhaust pipe 514. After the concentrated sulfuric acid solution absorbs the moisture, the overall weight will increase, so that the pressure of the collection bottle 510 on the compression spring 1 512 will increase. Since the power of the exhaust fan 57 is fixed, the flow rate of the air flow in the air inlet pipe 513 is fixed. Therefore, the higher the moisture content of the blank in the molding mold 2, the faster the weight of the collection bottle 510 increases in the same time, and the faster the collection bottle 510 descends in the same time. The exhaust pipe 514 and the air inlet pipe 513 will not limit the movement of the collection bottle 510, so that the higher the moisture content of the blank in the molding mold 2, the faster the collection bottle 510 descends in the initial heating stage.

[0056] The transmission member 59 includes a tooth plate 515 fixedly connected to the outer side of the fixed plate 511, and a transmission gear 1 516 is meshed on the outer side of the tooth plate 515. The center of the transmission gear 1 516 is fixedly connected to a rotating shaft 1 517. The rotating shaft 1 517 is rotatably connected to the inner wall of the detection chamber 56. The outer side of the rotating shaft 1 517 is fixedly connected to a transmission gear 2 518. The outer side of the transmission gear 2 518 is meshed with a transmission gear 3 519. The center of the transmission gear 3 519 is fixedly connected to a rotating shaft 2 520. The rotating shaft 2 520 is rotatably connected to the inner wall of the detection chamber 56. A transmission wheel 521 is fixedly connected to the outer side of the rotating shaft 2 520. A winding ring 522 is provided on the outer side of the transmission wheel 521. The winding ring 522 is rotatably connected to the inner wall of the detection chamber 56. The outer side of the transmission wheel 521 is rotatably connected to multiple friction Block 523, the friction block 523 contacts the inner wall of the winding ring 522, and a spring sheet 524 is fixedly connected to the outside of the friction block 523, and the spring sheet 524 is fixed to the surface of the transmission wheel 521. A fiber rope 525 is wrapped around the outside of the winding ring 522, and the end of the fiber rope 525 away from the winding ring 522 passes through the detection chamber 56 and is fixedly connected to the trigger block 526, and the trigger block 526 is slidably connected to the inner wall of the heat insulation box 54. A compression spring 2 527 is fixedly connected to the outside of the trigger block 526, and a solenoid valve 528 is installed on the outside of the air guide tube 52, and a travel switch 529 for controlling the switch of the solenoid valve 528 is provided on the outside of the trigger block 526. The travel switch 529 is also a normally open switch, so that when pressed, the solenoid valve 528 is controlled to release the blockage of the air guide tube 52.

[0057] When the moisture content of the blank in the forming mold 2 is greater than 0.04%, when the gas passing through the blank enters the collecting bottle 510, the descending speed of the collecting bottle 510 is greater than the descending speed of the collecting bottle 510 caused by the blank with a moisture content of 0.04%, and when the collecting bottle 510 drives the gear plate 515 to descend at an increased speed, the gear plate 515 drives the transmission gear 1 516 to rotate, and increases the speed of the transmission gear 1 516, and the transmission gear 1 516 drives the transmission gear 2 518 to rotate through the rotating shaft 1 517, and the transmission gear 2 518 drives the transmission gear 3 519 to rotate. The number of teeth of the second transmission gear 518 is greater than that of the first transmission gear 516, and the number of teeth of the third transmission gear 519 is smaller than that of the second transmission gear 518. Therefore, under the transmission amplification effect of the first transmission gear 516, the second transmission gear 518 and the third transmission gear 519, even if the gear plate 515 only descends a short distance, the third transmission gear 519 will rotate multiple times. Moreover, the faster the gear plate 515 descends, the more the speed of the third transmission gear 519 is amplified. The third transmission gear 519 drives the second rotating shaft 520 to rotate, and the second rotating shaft 520 drives the transmission wheel 521 to rotate.

[0058] When the moisture content of the stock in the forming mold 2 is greater than 0.04%, the rotation speed of the transmission wheel 521 causes the friction block 523 to extend outward, and the friction block 523 stretches the spring sheet 1 524. The friction force between the friction block 523 and the inner wall of the winding ring 522 increases, so that the transmission wheel 521 drives the winding ring 522 to rotate together, and the winding ring 522 winds up the fiber rope 525. The fiber rope 525 drives the trigger block 526 to move and trigger the travel switch 529. The travel switch 529 controls the solenoid valve 528 to release the blockage of the air guide tube 52, so that as long as the moisture content of the stock in the forming mold 2 is greater than 0.04%, the air guide tube 52 will be in a connected state.

[0059] When the moisture content of the blank in the forming mold 2 is less than 0.04%, the friction block 523 does not stretch the spring sheet 1 524, so that the friction between the friction block 523 and the inner wall of the winding ring 522 does not drive the winding ring 522 to rotate, and the limit switch 529 will not be triggered.

[0060] The guiding mechanism 6 includes a plurality of air guide grooves 60 provided at the bottom of the forming mold 2. When the forming mold 2 is placed in the placement bin 51, each air guide groove 60 corresponds to a port of the air guide pipe 52 in the placement bin 51. The inner wall of the air guide groove 60 is slidably connected with a closing plate 61. The closing plate 61 is slidably connected to the inner wall of the air guide groove 60. The bottom of the closing plate 61 is fixedly connected with a spring piece 2 62. The spring piece 2 62 is fixed to the bottom of the air guide groove 60. The bottom of the closing plate 61 is fixedly connected with an inclined block 63. The outer side of the inclined block 63 is slidably connected with a push block 64. The push block 64 is slidably connected to the inner wall of the air guide groove 60. The outer side of the push block 64 is fixedly connected with a compression spring 3 65. The compression spring 3 65 is fixed to the inner wall of the air guide groove 60. The compression spring 3 65 is not The stabilizing block 66 is slidably connected to the bottom of the closing plate 61, and a spring piece 3 67 is fixedly connected to the outside of the stabilizing block 66. The spring piece 3 67 is fixed to the inner wall of the air guide groove 60. The stabilizing block 66 is trapezoidal at one end close to the push block 64, and a trapezoidal groove 68 is provided on the side of the push block 64 close to the stabilizing block 66. Through the action of the stabilizing block 66, when the forming mold 2 is in the initial state, the closing plate 61 stably closes the air guide groove 60, so that the bottom of the forming mold 2 is flat. Only when the push block 64 moves, the closing plate 61 will drop so that the gas injected by the air guide pipe 52 contacts the bottom of the blank through the air guide groove 60, forming a double-sided airflow, reducing the stagnation area, and reducing the risk of defects such as bubbles and pores caused by excessive local moisture concentration.

[0061] When the air guide pipe 52 is in a connected state, the heated inert gas in the sintering molding furnace 50 is injected into the air guide groove 60 at the bottom of the molding die 2 through the air guide pipe 52. Because the closing plate 61 partially closes the air guide groove 60 at the beginning, the pressure on the side of the air guide groove 60 close to the air guide pipe 52 increases, and the air pressure pushes the push block 64 to slide on the inner wall of the air guide groove 60. The push block 64 squeezes the compression spring 3 65. When the push block 64 slides on the inner wall of the air guide groove 60, the oblique side of the trapezoidal groove 68 will first squeeze the oblique side of the stabilizing block 66, thereby pushing The dynamic stabilizing block 66 moves in the horizontal direction, and the stabilizing block 66 squeezes the spring piece three 67, so that the stabilizing block 66 no longer restricts the downward movement of the closing plate 61. After the push block 64 moves the stabilizing block 66, the oblique side of the push block 64 squeezes the oblique block 63. After the oblique block 63 is subjected to the downward extrusion force, it drives the closing plate 61 to move downward. The closing plate 61 squeezes the spring piece two 62, so that the air guide groove 60 is connected to the bottom of the forming mold 2, so that the gas entering the air guide groove 60 will heat the bottom of the blank through the air guide groove 60, forming a double-sided airflow.

[0062] Example 2

[0063] In the second embodiment, other structures remain unchanged. The difference from the first embodiment is that an O-type plug 7 is fixedly connected to the outside of the air guide groove 60. The O-type plug 7 can be inserted into the port of the air guide tube 52. The O-type plug 7 is made of stainless steel and has a corrugated surface. The corrugated design forms an elastic seal when deformed and reset, ensuring that gas only enters through the air guide groove 60. Therefore, when the staff puts the forming mold 2 into the placement bin 51, the corrugated part of the O-type plug 7 is deformed first, until the O-type plug 7 corresponds to the port of the air guide tube 52, and then the corrugated part of the O-type plug 7 is reset, so that the O-type plug 7 extends into the port of the air guide tube 52, ensuring that the gas in the air guide tube 52 is concentrated and input into the air guide groove 60.

[0064] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0065] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A PTFE pre-sintered material preparation device, comprising: conveyor platform; It is characterized in that: it also includes a forming mold, the forming mold is placed in the carrying area of ​​the conveyor platform, and the conveyor platform transports the forming mold placed in the carrying area; An infrared moisture meter is installed on the surface of the conveyor platform to detect the moisture content of the PTFE powder in the molding die; A pressing and molding device, the pressing and molding device is located on the surface of the conveying platform, the pressing and molding device preliminarily presses and molds the PTFE powder in the molding die, and when the pressing and molding device presses the PTFE powder in the molding die, the pressing and molding device controls the infrared moisture meter to randomly sample and detect the moisture content of the PTFE powder in different molding dies; A sintering molding device, located outside the conveying platform, sintering the powder in the molding die that has been preliminarily compacted, and detecting the moisture content of the gas emitted from each molding die when heating the molding die; The guiding mechanism is located on the inner wall of the forming mold. After the sintering molding equipment detects that the moisture content in the gas dissipated from the forming mold exceeds a predetermined value, the guiding mechanism forms a heating air flow channel at the bottom of the forming mold. The heated air flow in the sintering molding equipment heats the bottom of the compacted blank in the forming mold through the guiding mechanism.

2. PTFE pre-sintering material preparation device according to claim 1, is characterized in that: The pressing and forming equipment includes a mounting seat, which is fixed on the surface of the conveying platform. A hydraulic press is installed on the surface of the mounting seat. A pressure plate is fixedly connected to the output end of the hydraulic press. The four corners of the pressure plate are respectively fixedly connected to limit rods. The limit rods are slidably connected to the inner wall of the mounting seat. A control component for controlling the intermittent operation of the infrared moisture meter is provided on the surface of the mounting seat.

3. PTFE pre-sintering material preparation device according to claim 2, is characterized in that: The control component includes a control box installed on the surface of the mounting seat, and the interior of the control box is a control compartment and a transmission compartment. A plurality of support columns are fixedly connected to the inner wall of the control compartment, and the plurality of support columns are spaced 60° apart. Control switches are installed on the top of some of the support columns, and the plurality of control switches are spaced 120° apart. The control switch is connected to the infrared moisture meter. A return spring is provided on the outside of the support column, and one end of the return spring is fixed to the inner wall of the control compartment, and the other end of the return spring is fixedly connected to a trigger plate, and the trigger plate is slidably connected to the inner wall of the control compartment. A trigger component is provided on the inner wall of the control box for randomly pressing a trigger plate each time the limit rod descends.

4. PTFE pre-sintering material preparation device according to claim 3, is characterized in that: The trigger member includes a transmission rod rotatably connected to the inner wall of the control box, the transmission rod is located at one end of the control compartment and is fixedly connected to a swing arm, a connecting hole is opened on the inner wall of the swing arm, and a ball is provided on the inner wall of the connecting hole, and the ball can roll and slide on the inner wall of the connecting hole, the transmission rod is located at one end of the transmission compartment and is fixedly connected to the fan blade, the inner wall of the transmission compartment is installed with a nozzle, the nozzle is arranged obliquely, the outside of the control box is fixedly connected to an air supply pipe, the air supply pipe is connected to the nozzle, one of the limit rods is fixedly connected to the outside of the piston plate, the surface of the mounting seat is fixedly connected to a sealing box, the piston plate is slidably connected to the inner wall of the sealing box, and the air supply pipe is connected to the bottom of the sealing box.

5. The PTFE pre-sintering material preparation device according to claim 1, wherein: The sintering and molding equipment includes a sintering and molding furnace, which is located outside the conveying platform. The inner wall of the sintering and molding furnace is provided with multiple placement bins, and the placement bins are used to place the molding molds that have been preliminarily compacted. The side walls of the placement bins are fixedly connected with multiple air ducts, and the air ducts are connected to the air ducts in the sintering and molding furnace. The inner wall of the sintering and molding furnace is provided with multiple detection parts for detecting the moisture content of the exhaust gas. The detection parts control the connectivity of the air ducts according to the detection results, and multiple detection parts correspond to each placement bin.

6. The PTFE pre-sintering material preparation device according to claim 5, wherein: The detection component includes an insulation box located on the inner wall of the sintering furnace. The interior of the insulation box is divided into a collecting bin and a detection bin. The collecting bin is connected to the placement bin. An exhaust fan is installed on the inner wall of the collecting bin. When the exhaust fan is working, it guides the airflow passing through the forming mold in the sintering furnace into the collecting bin. A water absorbent is provided on the inner wall of the detection bin. The water absorbent absorbs moisture in the guided airflow. A transmission component is provided on the inner wall of the detection bin. The transmission component is connected to the water absorbent. When the moisture absorbed by the water absorbent per unit time exceeds a predetermined value, the transmission component controls the air guide pipe to be in a connected state.

7. The PTFE pre-sintering material preparation device according to claim 6, wherein: The water absorbing component includes a collecting bottle located in the detection chamber, a fixing plate fixedly connected to the bottom of the collecting bottle, the fixing plate is slidably connected to the inner wall of the detection chamber, a compression spring 1 is fixedly connected to the bottom of the fixing plate, and the compression spring 1 is fixedly connected to the inner wall of the detection chamber at one end away from the fixing plate. An air inlet pipe and an exhaust pipe are connected in the collecting bottle, the air inlet pipe is connected to the collecting chamber, and concentrated sulfuric acid solution is stored in the collecting bottle. The air inlet pipe is located below the liquid level of the concentrated sulfuric acid solution, and the exhaust pipe is located above the liquid level of the concentrated sulfuric acid solution.

8. The PTFE pre-sintering material preparation device according to claim 7, wherein: The transmission member includes a toothed plate fixedly connected to the outer side of a fixed plate, a transmission gear 1 meshing with the outer side of the toothed plate, a rotating shaft 1 fixedly connected to the center of the transmission gear 1, the rotating shaft 1 being rotatably connected to the inner wall of the detection chamber, a transmission gear 2 fixedly connected to the outer side of the rotating shaft 1, a transmission gear 3 meshing with the outer side of the transmission gear 2, a transmission gear 3 fixedly connected to the center of the rotating shaft 2, the rotating shaft 2 being rotatably connected to the inner wall of the detection chamber, a transmission wheel fixedly connected to the outer side of the rotating shaft 2, a winding ring provided on the outer side of the transmission wheel, the winding ring being rotatably connected to the inner wall of the detection chamber, a plurality of friction blocks rotatably connected to the outer side of the transmission wheel, the friction blocks contacting the inner wall of the winding ring, a spring sheet 1 fixedly connected to the outer side of the friction block, the spring sheet 1 being fixedly connected to the surface of the transmission wheel, a fiber rope wrapped around the outer side of the winding ring, the end of the fiber rope away from the winding ring passing through the detection chamber and fixedly connected to a trigger block, the trigger block being slidably connected to the inner wall of the heat insulation box, a compression spring 2 fixedly connected to the outer side of the trigger block, an electromagnetic valve installed on the outer side of the air guide pipe, a travel switch for controlling the opening and closing of the electromagnetic valve provided on the outer side of the trigger block.

9. The PTFE pre-sintering material preparation device according to claim 8, wherein: The guiding mechanism includes a plurality of air guide grooves provided at the bottom of the forming mold, and when the forming mold is placed in the placing bin, each of the air guide grooves corresponds to the air guide pipe port in the placing bin, and the inner wall of the air guide groove is slidably connected to a closing plate, and the closing plate is slidably connected to the inner wall of the air guide groove, and the bottom of the closing plate is fixedly connected to a spring sheet 2, and the spring sheet 2 is fixed to the bottom of the air guide groove, and the bottom of the closing plate is fixedly connected to an inclined block, and the outer side of the inclined block is slidably connected to a push block, and the push block is slidably connected to the inner wall of the air guide groove, and the outer side of the push block is fixedly connected to a compression spring 3, and the bottom of the closing plate is slidably connected to a stabilizing block, and the outer side of the stabilizing block is fixedly connected to a spring sheet 3, and the stabilizing block is trapezoidal near one end of the push block, and a trapezoidal groove is provided on the side of the push block close to the stabilizing block.

10. The PTFE pre-sintering material preparation device according to claim 9, characterized in that: An O-shaped plug is fixedly connected to the outside of the air guide groove, and the O-shaped plug can be inserted into the port of the air guide pipe. The O-shaped plug is made of stainless steel and has a corrugated surface.

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