An extrusion molding process experimental simulation device and an application method thereof

Abstract

The application relates to the technical field of measuring devices which are not specifically suitable for the measurement of specific variables, in particular to an extrusion molding process experiment simulation device and an application method thereof, which comprises a rack, a barrel, a barrel transfer mechanism and a controller; the barrel is a cylindrical barrel body, the barrel is provided with a molding hole penetrating along the axial direction of the barrel, and a plurality of temperature sensors and pressure sensors are installed in the barrel; a pre-pressing station and a molding station are arranged on the rack, the pre-pressing station is provided with a pre-pressing press and a bottom support, the molding station is provided with a molding press and an extrusion die, and the barrel transfer mechanism is used for driving the barrel to move between the pre-pressing station and the molding station. The application can simulate the actual extrusion process, and can collect temperature signals and pressure signals in real time, so as to obtain characteristic parameters when the material is extruded.

Description

Technical Field

[0001] This invention relates to the field of measurement devices that are not specifically applicable to a particular variable, and specifically to an experimental simulation device for extrusion molding process and its application method. Background Technology

[0002] Hydraulic extrusion molding, also known as oil pressure extrusion molding, is similar to traditional mechanical extrusion molding. Its core lies in using a hydraulic system to drive an extrusion bar, forcing metal or polymer materials through a mold to produce continuous profiles with a predetermined cross-sectional shape.

[0003] While existing extrusion production equipment can complete profile manufacturing, it is difficult to obtain key process data such as temperature, pressure and material flow state in real time during the extrusion process. As a result, process optimization mainly relies on experience-based adjustments, lacks high-quality experimental data support, and is difficult to establish accurate process prediction models and intelligent control models. Summary of the Invention

[0004] The purpose of this invention is to provide an experimental simulation device for extrusion molding process and its application method, so as to solve the technical problem of how to collect process parameters in real time during the extrusion molding process.

[0005] To solve the above-mentioned technical problems, the present invention specifically provides the following technical solution:

[0006] An experimental simulation device for extrusion molding process includes: a frame, a barrel, and a controller;

[0007] The material cylinder is a cylindrical body, and the material cylinder has a forming hole that runs through its own axis. Multiple temperature sensors and multiple pressure sensors are arranged at different axial and circumferential positions inside the forming hole. The controller is connected to the temperature sensors and the pressure sensors and receives temperature signals and pressure signals.

[0008] The frame is provided with a base and an extrusion die. The barrel can be installed on the base or the extrusion die, so that the forming hole forms a cavity with an open top.

[0009] The controller is used to establish a temperature field and a pressure field inside the cavity based on the temperature signal and the pressure signal when the material inside the cavity is squeezed.

[0010] Furthermore, the frame is equipped with a pre-pressing station and a forming station;

[0011] The base is set at the pre-compression station, the pre-compression station is equipped with a pre-compression press, the pre-compression press is equipped with a pre-compression head, and the pre-compression press is used to drive the pre-compression head to squeeze the material inside the cavity;

[0012] The extrusion die is located at the forming station, the forming station is equipped with a forming press, the forming press is equipped with a forming head, and the forming press is used to drive the forming head to extrude the material inside the cavity.

[0013] Furthermore, it also includes a barrel transfer mechanism, which is used to drive the barrel to move between the pre-pressing station and the forming station;

[0014] When the barrel moves to the pre-pressing station, the bottom support contacts the bottom of the barrel and seals the forming hole to form the cavity;

[0015] When the barrel moves to the forming station, the extrusion die contacts the bottom of the barrel and seals the forming hole to the cavity.

[0016] Furthermore, the material cylinder transfer mechanism includes a first guide rail, a first carrier, a second carrier, a first horizontal driver, and a vertical driver;

[0017] The first guide rail is horizontally disposed on the frame, the first carrier is slidably mounted on the first guide rail, the first horizontal driver connects the first carrier and the frame, and the first horizontal driver is used to drive the first carrier to move along the first guide rail, thereby enabling the first carrier to move horizontally between the pre-pressing station and the forming station;

[0018] The second vehicle is vertically movable and mounted on the first vehicle. The vertical actuator connects the first vehicle and the second vehicle and is used to drive the second vehicle to move up and down.

[0019] The material cylinder is mounted on the second carrier. When the second carrier moves up and down, the bottom of the material cylinder moves closer to or further away from the base and the extrusion die.

[0020] Furthermore, the vertical drive includes multiple lead screw slides and a motor, the lead screw slides being evenly distributed around the axis of the material cylinder, and the motor being fixedly connected to the first carrier;

[0021] The lead screw slide includes a lead screw and a nut. The lead screw of each lead screw slide is vertically upward and rotatably connected to the first carrier. The nut of each lead screw slide is fixedly connected to the second carrier.

[0022] The power output shaft of the motor is connected to the lead screw of each lead screw slide through a transmission mechanism, thereby driving each lead screw to rotate at the same speed, so that each nut rises and falls at the same speed, thereby driving the second carrier to rise and fall vertically.

[0023] Furthermore, the bottom of the barrel is provided with a positioning cylinder extending axially downward, and the bottom support and the top periphery of the extrusion die are respectively provided with a first annular positioning groove and a second annular positioning groove that are engaged with the positioning cylinder.

[0024] When the material cylinder contacts the base, the positioning cylinder is inserted into the first annular positioning groove;

[0025] When the barrel comes into contact with the extrusion die, the positioning cylinder is inserted into the interior of the second annular positioning groove.

[0026] Furthermore, the frame is provided with a second guide rail, a positioning bar, and a second horizontal driver. The second guide rail is horizontally arranged and fixedly connected to the frame. The positioning bar is slidably mounted on the second guide rail. The second horizontal driver is used to drive the positioning bar to move along the second guide rail.

[0027] The outer wall of the barrel is provided with a strip-shaped positioning groove. When the barrel contacts the extrusion die and the positioning cylinder is inserted into the second annular positioning groove on the periphery of the extrusion die, the strip-shaped positioning groove is located in the movement path of the positioning strip.

[0028] When the second horizontal driver drives the positioning bar to insert into the strip positioning groove, the material cylinder cannot move vertically, thereby locking the material cylinder.

[0029] Furthermore, the bottom of the extrusion die is exposed on the outside of the frame, and a size measuring device is provided below the extrusion die. The size measuring device includes: an image acquisition device, a cutter, a third carrier, and a controller.

[0030] The image acquisition device and the cutter are mounted on the third vehicle and move synchronously with the third vehicle;

[0031] The third carrier moves along the cutting direction, causing the cutter to cut the strip material continuously extruded by the extrusion die, thereby forming a continuous cross-section of the strip material along the cutting direction;

[0032] The image acquisition device includes a two-dimensional line scan camera, which is located on the rear side of the cutter in the cutting direction and continuously acquires line-by-line images of the cross-section during the cross-section formation process. The controller is used to obtain the size of the strip material based on the line-by-line images.

[0033] Furthermore, the cutter includes a blade, which is elongated and its length direction is perpendicular to the cutting direction;

[0034] One long side of the cutting tool forms a cutting edge, which remains in contact with the bottom end face of the extrusion die.

[0035] An application method of an extrusion molding process experimental simulation device includes the following steps: loading: installing the barrel on the base, loading the material into the barrel, and then pre-pressing the material inside the barrel;

[0036] Extrusion molding: After pre-compression is completed, the barrel is installed on the extrusion die, and then the material inside the barrel is extruded;

[0037] Calculate the pressure field and temperature field of pre-compression: During the pre-compression and extrusion process, the temperature and pressure signals inside the barrel are collected simultaneously and transmitted to the controller. The controller calculates the pressure field and temperature field based on the multiple temperature and pressure signals.

[0038] Compared with the prior art, the present invention has the following advantages:

[0039] The extrusion molding process simulation device proposed in this invention can simulate the actual extrusion process and collect temperature and pressure signals in real time, thereby obtaining the characteristic parameters of the material when it is extruded. Attached Figure Description

[0040] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of a traditional pharmaceutical strip extrusion device;

[0042] Figure 2 This is a top view of the experimental simulation device for extrusion molding process proposed in this invention;

[0043] Figure 3 for Figure 2 A cross-sectional view along the AA direction;

[0044] Figure 4 for Figure 2 A cross-sectional view along the BB direction;

[0045] Figure 5 This is a perspective view of the extrusion molding process experimental simulation device proposed in this invention with the frame hidden.

[0046] Figure 6This is a perspective view of the experimental simulation device for extrusion molding process proposed in this invention, with the frame and barrel concealed.

[0047] Figure 7 This is a perspective view of the experimental simulation device for extrusion molding process proposed in this invention, with the frame and barrel transfer mechanism hidden.

[0048] Figure 8 This is a bottom view of the first embodiment of the dimension measuring device proposed in this invention;

[0049] Figure 9 for Figure 8 A cross-sectional view along the CC direction;

[0050] Figure 10 This is a perspective view of the second embodiment of the size measuring device proposed in this invention, with the extrusion die hidden.

[0051] The reference numerals in the figure are as follows:

[0052] 1-Rack;

[0053] 2-Pre-compression press; 21-Pre-compression head; 22-Base support; 23-First annular positioning groove;

[0054] 3-Forming press; 31-Forming head; 32-Extrusion die; 33-Second annular positioning groove;

[0055] 4-Barrel; 41-Forming hole; 42-Positioning cylinder;

[0056] 5- Rotary transposition mechanism;

[0057] 6-Bug transfer mechanism; 61-First guide rail; 62-First carrier; 63-Second carrier; 64-First horizontal drive; 65-Vertical drive; 651-Screw slide; 652-Screw; 653-Nut; 654-Motor; 655-T-type reducer; 656-L-type reducer;

[0058] 7-Barrel locking mechanism; 71-Second guide rail; 72-Positioning bar; 73-Second horizontal actuator; 74-Strip positioning groove;

[0059] 8-Dimensional measuring device; 81-Third guide rail; 82-Third carrier; 83-Image acquisition device; 831-Two-dimensional line scan camera; 832-Line scan coaxial light source; 84-Cutter; 841-Knife; 842-Blade edge; 843-Push plate; 85-Third horizontal actuator; 86-Fourth carrier; 87-Rotary actuator. Detailed Implementation

[0060] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0061] This invention uses a simulated drug strip extrusion process as an example to illustrate the structure and working principle of an experimental simulation device for extrusion molding process. (Refer to...) Figure 1 Traditional pharmaceutical strip extrusion devices typically include: frame 1, pre-compression press 2, forming press 3, barrel 4, and rotary transfer mechanism 5.

[0062] The frame 1 is equipped with a pre-compression station and a forming station. The rotary switching mechanism 5 is used to drive the material cylinder 4 to move between the pre-compression station and the forming station. Traditional drug strip extrusion devices usually have two material cylinders 4. The rotary switching mechanism 5 is used to exchange the positions of the two material cylinders 4.

[0063] The material cylinder 4 is a cylindrical body, and the material cylinder 4 has a forming hole 41 that runs through it along its own axis. The forming hole 41 allows the pre-pressing head 21 and the forming head 31 to pass through.

[0064] The pre-compression station is equipped with a pre-compression press 2 and a base 22. When the material cylinder 4 is located at the pre-compression station, the base 22 contacts the bottom of the material cylinder 4 and blocks the forming hole 41 to form a cavity with an open top. The pre-compression press 2 is used to drive the pre-compression head 21 into the forming hole 41 of the material cylinder 4 and close to the base 22, thereby compacting the material filled in the material cylinder 4.

[0065] The molding station is equipped with a molding press 3 and an extrusion die 32. When the barrel 4 is located at the molding station, the extrusion die 32 contacts the bottom of the barrel 4 and blocks the molding hole 41 to form a cavity with an open top. The molding press 3 is used to drive the molding head 31 into the molding hole 41 of the barrel 4 and approach the extrusion die 32, thereby extruding the material from the through hole of the extrusion die 32.

[0066] Traditional pharmaceutical strip extrusion processes include the following steps.

[0067] Step 1, Loading: Load the prepared drug mixture into the material cylinder 4 until the material cylinder 4 reaches the specified loading amount.

[0068] Step 2, pre-compression: The pre-compression press 2 drives the pre-compression head 21 to squeeze the material in the cylinder 4, applying axial pressure to it, so that the loose material is compacted into a medicine cake with a certain strength and density.

[0069] Step 3, extrusion molding: The rotary positioning mechanism 5 moves the barrel 4 from the pre-pressing station to the molding station. The molding head 31 of the molding press 3 continues to push the drug cake downward, pressing the drug cake against the extrusion die 32. Under high pressure, the drug is extruded through the through hole on the extrusion die 32 to form the corresponding number of drug strips.

[0070] During the extrusion process of the material and the blister pack, key process data such as the temperature, pressure, and flow state of the material are very important to the final quality of the blister pack, and the diameter of the freshly extruded blister pack is very important to the final size of the blister pack.

[0071] Traditional drug extrusion devices have two barrels 4. The two barrels 4 need to constantly exchange their positions between the pre-compression station and the forming station. It is difficult to install sensors and wiring harnesses on the barrels 4, so it is difficult to detect key data such as material temperature, pressure, and flow state. The extrusion die 32 of the traditional drug extrusion device is enclosed inside the die sleeve, so it is difficult to detect the diameter of the freshly extruded drug strip.

[0072] In order to detect key data such as the temperature, pressure, and flow state of materials, this invention proposes an experimental simulation device for extrusion molding process and its application method, taking the extrusion strip extrusion process as an example.

[0073] refer to Figure 2 , Figure 3 , Figure 4 The extrusion molding process experimental simulation device includes: frame 1, pre-press press 2, molding press 3, barrel 4, and barrel transfer mechanism 6.

[0074] The frame 1 is equipped with a pre-pressing station and a forming station. In this embodiment, only one material cylinder is provided. The material cylinder transfer mechanism 6 is used to drive the material cylinder 4 to move between the pre-pressing station and the forming station.

[0075] The material cylinder 4 is a cylindrical body with a forming hole 41 that runs through it along its own axis. The forming hole 41 allows the pre-pressing head 21 and the forming head 31 to pass through. Multiple temperature sensors and pressure sensors are installed in the material cylinder 4. The temperature sensors and pressure sensors are used to collect temperature signals and pressure signals and transmit them to the controller. The controller calculates the pressure field and temperature field based on the multiple temperature signals and pressure signals.

[0076] The material transfer mechanism 6 includes a first guide rail 61, a first carrier 62, a second carrier 63, a first horizontal driver 64, and a vertical driver 65.

[0077] The first guide rail 61 is horizontally arranged on the frame 1. The first carrier 62 is slidably mounted on the first guide rail 61. The first horizontal driver 64 connects the first carrier 62 and the frame 1. The first horizontal driver 64 is used to drive the first carrier 62 to move along the first guide rail 61, so that the first carrier 62 can move horizontally between the pre-pressing station and the forming station.

[0078] The second vehicle 63 is vertically movable and mounted on the first vehicle 62. The vertical actuator 65 connects the first vehicle 62 and the second vehicle 63 and is used to drive the second vehicle 63 to move up and down.

[0079] The barrel 4 is fixedly installed on the second carrier 63. When the second carrier 63 moves up and down, the bottom of the barrel 4 moves closer to or further away from the base 22 and the extrusion mold 32, so that the base 22 and the extrusion mold 32 can block the forming hole 41 of the barrel 4.

[0080] The pre-compression station is equipped with a pre-compression press 2 and a base 22. When the material cylinder 4 is located at the pre-compression station, the base 22 contacts the bottom of the material cylinder 4 and blocks the forming hole 41 to form a cavity with an open top. The pre-compression press 2 is used to drive the pre-compression head 21 into the forming hole 41 of the material cylinder 4 and close to the base 22, thereby compacting the material filled in the material cylinder 4.

[0081] The molding station is equipped with a molding press 3 and an extrusion die 32. When the barrel 4 is located at the molding station, the extrusion die 32 contacts the bottom of the barrel 4 and blocks the molding hole 41 to form a cavity with an open top. The molding press 3 is used to drive the molding head 31 into the molding hole 41 of the barrel 4 and approach the extrusion die 32, thereby extruding the material from the extrusion die 32.

[0082] The application method of the extrusion molding process experimental simulation device includes the following steps.

[0083] Step 1, loading: The material cylinder transfer mechanism 6 moves the material cylinder 4 to the pre-compression station and makes the material cylinder 4 contact the bottom support 22, loading the prepared drug mixture into the material cylinder 4 so that the material cylinder 4 reaches the specified loading amount.

[0084] Step 2, pre-compression: The pre-compression press 2 drives the pre-compression head 21 to squeeze the material in the cylinder 4 and apply axial pressure to it, so that the loose material is compacted into a cake with a certain strength and density. Temperature and pressure sensors collect temperature and pressure signals inside the cylinder 4.

[0085] Step 3, extrusion molding: The barrel transfer mechanism 6 moves the barrel 4 from the pre-pressing station to the molding station. The molding head 31 of the molding press 3 pushes the drug cake downward and presses the drug cake against the extrusion die 32. Under high pressure, the drug is extruded through the through hole on the extrusion die 32 to form a corresponding number of drug strips. Temperature and pressure sensors collect temperature and pressure signals inside the barrel 4 and transmit the temperature and pressure signals to the controller. The controller calculates the pressure field and temperature field based on multiple temperature and pressure signals.

[0086] refer to Figure 5 , Figure 6 , Figure 7 Other details that require further explanation are as follows.

[0087] The sensor setup method is as follows: 4 to 6 temperature sensors and pressure sensors are arranged along the axis of the barrel 4, and 3 to 5 temperature sensors and pressure sensors are arranged around the axis of the barrel 4. The temperature detection range of the temperature sensors is 0 to 100℃, and the pressure range of the pressure sensors is 0 to 40MPa.

[0088] The first horizontal actuator 64 is a cylinder. The cylinder body of the first horizontal actuator 64 is fixedly connected to the frame 1, and the rod body of the first horizontal actuator 64 is fixedly connected to the first carrier 62. When the rod body of the first horizontal actuator 64 extends or retracts, the first carrier 62 moves horizontally on the first guide rail 61. The stroke of the first carrier 62 is constrained by limiters installed at both ends of the first guide rail 61.

[0089] The vertical actuator 65 includes multiple lead screw slides 651 and a motor 654. Each lead screw slide 651 includes a lead screw 652 and a nut 653. The lead screw slides 651 are evenly distributed around the axis of the material cylinder 4. The motor 654 is fixedly connected to the first carrier 62. The lead screw 652 of each lead screw slide 651 is vertically upward and rotatably connected to the first carrier 62. The nut 653 of each lead screw slide 651 is fixedly connected to the second carrier 63. The power output shaft of the motor 654 is connected to the lead screw 652 of each lead screw slide 651 through a transmission mechanism, thereby driving each lead screw 652 to rotate at the same speed, so that each nut 653 rises and falls at the same speed, thereby driving the second carrier 63 to rise and fall vertically.

[0090] There are four lead screw slides 651 in total. The transmission mechanism includes three T-type reducers 655 and four L-type reducers 656. Each T-type reducer 655 includes one input shaft and two output shafts, and each L-type reducer 656 includes one input shaft and one output shaft.

[0091] In this configuration, the power output shaft of motor 654 is connected to the input shaft of a T-type reducer 655. The two output shafts of the T-type reducer 655 are respectively connected to the input shafts of two L-type reducers 656. The output shafts of the two L-type reducers 656 are respectively connected to the input shafts of the remaining two T-type reducers 655. One output shaft of the remaining two T-type reducers 655 is respectively connected to two lead screws 652. The other output shaft of the remaining two T-type reducers 655 is respectively connected to the input shafts of the remaining two L-type reducers 656. The output shafts of the remaining two L-type reducers 656 are respectively connected to two lead screws 652. Thus, a transmission connection is established between the power output shaft of motor 654 and each lead screw 652.

[0092] Furthermore, the bottom of the barrel 4 is provided with a positioning cylinder 42 extending axially downward. The top periphery of the base 22 and the extrusion mold 32 are respectively provided with a first annular positioning groove 23 and a second annular positioning groove 33 that are engaged with the positioning cylinder 42. When the barrel 4 contacts the base 22 or the extrusion mold 32, the positioning cylinder 42 is inserted into the first annular positioning groove 23 or the second annular positioning groove 33. At this time, the barrel 4 cannot move horizontally.

[0093] Furthermore, the frame 1 is also equipped with a material cylinder 4 locking mechanism, which includes: a second guide rail 71 and a positioning bar 72.

[0094] The second guide rail 71 is horizontally set and fixedly connected to the frame 1. The positioning bar 72 is slidably mounted on the second guide rail 71. The second horizontal driver 73 is used to drive the positioning bar 72 to move along the second guide rail 71.

[0095] The second horizontal actuator 73 is preferably a cylinder, the cylinder body of the second horizontal actuator 73 is fixedly connected to the frame 1, and the rod body of the second horizontal actuator 73 is fixedly connected to the positioning bar 72.

[0096] The outer wall of the barrel 4 is provided with an inwardly recessed strip-shaped positioning groove 74; when the barrel 4 contacts the extrusion die 32 and the positioning cylinder 42 is inserted into the second annular positioning groove 33 on the periphery of the extrusion die 32, the strip-shaped positioning groove 74 is located in the moving path of the positioning insert; when the second horizontal driver 73 drives the positioning bar 72 to insert into the strip-shaped positioning groove 74, the barrel 4 cannot move horizontally or vertically, thereby locking the barrel 4.

[0097] In order to detect the diameter of freshly extruded drug strips, this invention proposes a size measurement device and method based on the extruded material, taking the drug strip extrusion process as an example.

[0098] (First embodiment)

[0099] refer to Figure 8 , Figure 9The bottom of the extrusion die 32 is exposed on the outside of the frame 1. The size measuring device includes the following components located below the extrusion die 32: a third guide rail 81, a third carrier 82, an image acquisition device 83, a cutter 84, and a third horizontal drive 85.

[0100] The image acquisition device 83 is configured to take an upward image to acquire an image of the measurement plane, which is a horizontal plane directly below the extrusion die 32. The cross-section of the strip on the measurement plane best reflects the diameter of the freshly extruded strip.

[0101] The third guide rail 81 is horizontally arranged on the frame 1. The third carrier 82 is slidably mounted on the third guide rail 81. The third horizontal driver 85 connects the third carrier 82 and the frame 1. The third horizontal driver 85 is used to drive the third carrier 82 to move along the third guide rail 81. The image acquisition device 83 and the cutter 84 are both mounted on the third carrier 82, so that the cutter 84 can move horizontally on both sides of the extrusion die 32.

[0102] The third horizontal actuator 85 can be a cylinder, with the cylinder body fixedly connected to the frame 1 and the cylinder rod fixedly connected to the third carrier 82.

[0103] When the third horizontal drive 85 is working, the cutter 84 moves with the third carrier 82, sweeping horizontally over the measuring plane, thereby cutting off the cross-section (strip) of the vertically moving strip material and forming a cross-section. Then the image acquisition device 83 acquires an image of the cross-section.

[0104] Furthermore, the image acquisition device 83 includes a two-dimensional line scan camera 831 and a line scan coaxial light source 832, both of which are mounted on the third carrier 82.

[0105] The reason why the image acquisition device 83 of the present invention uses a two-dimensional line scan camera 831 is as follows.

[0106] 2D area scan cameras can only perform dimensional calibration on a fixed measurement plane. The size of the drug strip is calculated by the ratio of camera pixels to the actual size. After the drug strip is cut, it will continue to be extruded at a certain speed. If you wait until all the drug strips are cut before taking a picture, the previously cut drug strips will have already protruded to a certain size, resulting in all the drug strips having uneven lengths and not being on the same measurement plane, making accurate measurement impossible.

[0107] The two-dimensional line scan camera 831 can capture images line by line and finally stitch them together into a complete image. When the cutter 84, the two-dimensional line scan camera 831 and the line scan coaxial light source 832 are all mounted on the third carrier 82, the movement direction and speed of the three are consistent. At this time, the triggering of each line of the two-dimensional line scan camera 831 is precisely controlled by the encoder. When the third horizontal driver 85 is working, the size measuring device completes the action of cutting and then shooting, and can ensure that the state of each strip of medicine is basically consistent when shooting each strip of medicine.

[0108] The dimensional measurement method includes the following steps.

[0109] Step 1, extrusion molding: The forming head 31 of the forming press 3 pushes the drug cake downward and presses the drug cake against the extrusion die 32. Under high pressure, the drug is extruded through the through hole on the extrusion die 32 to form a corresponding number of drug strips.

[0110] Step 2, cutting the drug strip: The third horizontal driver 85 drives the third carrier 82 to move from one side to the other side below the extrusion die 32. During this process, the drug strip is cut by the cutter 84 to form a cross section.

[0111] Step 3, image acquisition: The strip continues to move downwards so that when the cross-section of the strip reaches the measurement plane, the 2D line scan camera 831 and the line scan coaxial light source 832 are exactly below the cross-section. The 2D line scan camera 831 captures images line by line and sends the images to the image acquisition card and industrial control computer to stitch them into a complete image. Finally, the size parameters (e.g., diameter) of the strip are calculated by the size analysis software.

[0112] Other details that require further explanation are as follows.

[0113] The extrusion die 32 is a disc with a diameter of 200 mm. Hundreds of through holes are arranged inside the extrusion die 32, each of which is a round hole with a diameter of 0.8 mm.

[0114] The 2D line scan camera 831 has an X-axis resolution of 16384 pixels. The design of the shooting field of view in the X direction is 230mm. The single pixel accuracy is 230mm / 16384pix = 0.014mm / pixel. A 0.8mm sample is approximately 57 pixels. The detection is relatively stable and the accuracy is sufficient.

[0115] The 2D line scan camera 831 uses an M72*0.75 interface industrial line scan lens. The design field of view of the 2D line scan camera 831 and the illumination range of the coaxial light source 832 are 230mm, which can fully cover the extrusion mold 32 with a diameter of 200mm.

[0116] The distance between the two-dimensional line scan camera 831 and the extrusion die 32 is approximately 300 mm.

[0117] To ensure that the image acquisition device 83 is positioned directly below the strip when the cross-section of the strip reaches the measuring plane, the first vertical distance h1 between the cutter 84 and the measuring plane, the second vertical distance h2 between the image acquisition device 83 and the measuring plane, and the horizontal distance s between the image acquisition device 83 and the cutter 84 satisfy the following condition: the first time t1 for the cross-section of the strip material to travel the first vertical distance h1 is equal to the second time t2 for the third horizontal driver 85 to drive the image acquisition device 83 to travel the horizontal distance s.

[0118] The cutter 84 includes a blade 841, which is directly mounted on the third carrier 82.

[0119] Furthermore, in order to obtain a flat cross-section of the drug strip and to ensure that the drug strip does not wobble when cut and does not affect subsequent photography, the cutting tool 841 is preferably long and narrow, with one side of the cutting tool 841 forming a cutting edge 842. The cutting edge 842 extends along the length of the cutting tool 841, and the cross-section of the cutting edge 842 is wedge-shaped. The cutting edge 842 is in contact with the bottom end face of the extrusion die 32.

[0120] Since the subsequent drug strips are still in the through hole of the extrusion mold 32 when the drug strip is cut, the subsequent drug strips will not shake due to the cutting. Furthermore, the cutting edge 842 of the cutter 841 remains in contact with the bottom end face of the extrusion mold 32, so that the cross-section of the drug strip is flush with the bottom end face of the extrusion mold 32, thereby obtaining a flat cross-section.

[0121] Furthermore, the cutter 84 also includes a push plate 843, which is disposed on the third carrier 82, below the cutter 841, and between the cutter 841 and the image acquisition device 83.

[0122] When the third horizontal drive 85 is working, the push plate 843 moves synchronously with the third carrier 82. After the cutter 841 cuts the drug strip, the push plate 843 pushes away the falling drug strip, thereby creating space for the subsequent image acquisition device 83 to acquire images and preventing the cut drug strip from falling onto the image acquisition device 83.

[0123] Preferably, the cutting tool 841, the push plate 843, and the third carrier 82 are an integral piece.

[0124] (Second Embodiment)

[0125] The size measuring device includes a third guide rail 81, a third carrier 82, an image acquisition device 83, a cutter 84, and a third horizontal driver 85, all disposed below the extrusion die 32.

[0126] refer to Figure 10The size measuring device also includes a shifting mechanism, which is used to move the position of the tool 841 or the image acquisition device 83 so that the tool 841 is always in front of the image acquisition device 83 during the reciprocating motion of the tool 841 and the image acquisition device 83.

[0127] Specifically, the cutter 841 is preferably elongated, with cutting edges 842 formed on both sides of the cutter 841. Both cutting edges 842 extend along the length of the cutter 841, and each cutting edge 842 has a wedge-shaped cross section. Each cutting edge 842 is in contact with the bottom end face of the extrusion die 32, so that the reciprocating motion of the cutter 841 can cut the drug strip.

[0128] In this embodiment, the position of the moving image acquisition device 83 is taken as an example to illustrate the structure and working principle of the transposition mechanism.

[0129] The switching mechanism includes a fourth carrier 86 and a rotary driver 87. The image acquisition device 83 is carried by the fourth carrier 86. The fourth carrier 86 is rotatably mounted on the third carrier 82 around a vertical axis. The rotary driver 87 connects the third carrier 82 and the fourth carrier 86. The rotary driver 87 is used to drive the fourth carrier 86 to rotate around the vertical axis, thereby driving the image acquisition device 83 to rotate. When the fourth carrier 86 rotates 180°, the image acquisition device 83 moves from the front of the cutter 841 to the rear of the cutter 841.

[0130] The rotary driver 87 can be a swing cylinder, the output shaft of which is connected to the central rotation shaft of the fourth vehicle 86, and the image acquisition device 83 is installed on the eccentric side of the fourth vehicle 86.

[0131] Furthermore, the cutter 84 also includes two push plates 843, both of which are mounted on the third carrier 82. The two push plates 843 are symmetrically arranged on both sides of the forward and backward direction of the image acquisition device 83, so that when the cutter 841 reciprocates, the push plates 843 can promptly push away the falling medicine strips.

[0132] Preferably, the cutting tool 841, the push plate 843, and the third carrier 82 are an integral piece.

[0133] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. All such modifications or substitutions should be covered within the protection scope of this application, and should not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. An experimental simulation device for extrusion molding process, characterized in that, include: The frame (1), the barrel (4), and the controller; The material cylinder (4) is a cylindrical body. The material cylinder (4) has a forming hole (41) that runs through its own axis. Multiple temperature sensors and multiple pressure sensors are arranged at different axial and circumferential positions inside the forming hole (41). The controller connects the temperature sensors and the pressure sensors and receives temperature signals and pressure signals. The frame (1) is provided with a base (22) and an extrusion die (32). The barrel (4) can be installed on the base (22) or the extrusion die (32), so that the forming hole (41) forms a cavity with an open top. The controller is used to establish a temperature field and a pressure field inside the cavity based on the temperature signal and the pressure signal when the material inside the cavity is squeezed.

2. The extrusion molding process experimental simulation device according to claim 1, characterized in that, The frame (1) is provided with a pre-pressing station and a forming station; The base (22) is set in the pre-pressing station, the pre-pressing station is equipped with a pre-pressing press (2), the pre-pressing press (2) is equipped with a pre-pressing head (21), and the pre-pressing press (2) is used to drive the pre-pressing head (21) to squeeze the material inside the cavity; The extrusion die (32) is set in the molding station, the molding station is equipped with a molding press (3), the molding press (3) is equipped with a molding head (31), and the molding press (3) is used to drive the molding head (31) to extrude the material inside the cavity.

3. The extrusion molding process experimental simulation device according to claim 2, characterized in that, It also includes a barrel transfer mechanism (6), which is used to drive the barrel (4) to move between the pre-pressing station and the forming station; When the barrel (4) moves to the pre-pressing station, the bottom support (22) contacts the bottom of the barrel (4) and blocks the forming hole (41) to form the cavity; When the barrel (4) moves to the molding station, the extrusion die (32) contacts the bottom of the barrel (4) and seals the molding hole (41) to the cavity.

4. The extrusion molding process experimental simulation device according to claim 3, characterized in that, The barrel transfer mechanism (6) includes a first guide rail (61), a first carrier (62), a second carrier (63), a first horizontal driver (64), and a vertical driver (65). The first guide rail (61) is horizontally arranged on the frame (1), the first carrier (62) is slidably mounted on the first guide rail (61), the first horizontal driver (64) connects the first carrier (62) and the frame (1), and the first horizontal driver (64) is used to drive the first carrier (62) to move along the first guide rail (61), so that the first carrier (62) can move horizontally between the pre-pressing station and the forming station; The second vehicle (63) is vertically movable and mounted on the first vehicle (62). The vertical actuator (65) connects the first vehicle (62) and the second vehicle (63). The vertical actuator (65) is used to drive the second vehicle (63) to move up and down. The barrel (4) is mounted on the second carrier (63). When the second carrier (63) moves up and down, the bottom of the barrel (4) approaches or moves away from the base (22) and the extrusion die (32).

5. The extrusion molding process experimental simulation device according to claim 4, characterized in that, The vertical drive (65) includes multiple lead screw slides (651) and a motor (654). The lead screw slides (651) are evenly distributed around the axis of the material cylinder (4), and the motor (654) is fixedly connected to the first carrier (62). The lead screw slide (651) includes a lead screw (652) and a nut (653). The lead screw (652) of each lead screw slide (651) is vertically upward and rotatably connected to the first carrier (62). The nut (653) of each lead screw slide (651) is fixedly connected to the second carrier (63). The power output shaft of the motor (654) is connected to the lead screw (652) of each lead screw slide (651) through a transmission mechanism, thereby driving each lead screw (652) to rotate at the same speed, so that each nut (653) rises and falls at the same speed, thereby driving the second carrier (63) to rise and fall vertically.

6. The experimental simulation device for extrusion molding process according to claim 1, characterized in that, The bottom of the material cylinder (4) is provided with a positioning cylinder (42) extending axially downward. The bottom support (22) and the top periphery of the extrusion die (32) are respectively provided with a first annular positioning groove (23) and a second annular positioning groove (33) that are in contact with the positioning cylinder (42). When the material cylinder (4) contacts the base (22), the positioning cylinder (42) is inserted into the interior of the first annular positioning groove (23); When the barrel (4) comes into contact with the extrusion die (32), the positioning cylinder (42) is inserted into the interior of the second annular positioning groove (33).

7. The experimental simulation device for extrusion molding process according to claim 6, characterized in that, The frame (1) is provided with a second guide rail (71), a positioning bar (72) and a second horizontal driver (73). The second guide rail (71) is horizontally arranged and fixedly connected to the frame (1). The positioning bar (72) is slidably mounted on the second guide rail (71). The second horizontal driver (73) is used to drive the positioning bar (72) to move along the second guide rail (71). The outer wall of the barrel (4) is provided with a strip-shaped positioning groove (74). When the barrel (4) contacts the extrusion mold (32) and the positioning cylinder (42) is inserted into the second annular positioning groove (33) on the periphery of the extrusion mold (32), the strip-shaped positioning groove (74) is located in the moving path of the positioning strip (72). When the second horizontal driver (73) drives the positioning bar (72) to insert into the strip positioning groove (74), the material cylinder (4) cannot move vertically, thereby locking the material cylinder (4).

8. The experimental simulation device for extrusion molding process according to claim 1, characterized in that, The bottom of the extrusion die (32) is exposed on the outside of the frame (1), and a size measuring device is provided below the extrusion die (32). The size measuring device includes: an image acquisition device (83), a cutter (84), a third carrier (82), and a controller. The image acquisition device (83) and the cutter (84) are mounted on the third vehicle (82) and move synchronously with the third vehicle (82); The third carrier (82) moves along the cutting direction, causing the cutter (84) to cut the strip material continuously extruded by the extrusion die (32), thereby forming a continuous cross-section of the strip material along the cutting direction; The image acquisition device (83) includes a two-dimensional line scan camera (831), which is located on the rear side of the cutter (84) in the cutting direction and continuously acquires line-by-line images of the cross-section during the cross-section formation process. The controller is used to obtain the size of the strip material based on the line-by-line images.

9. The experimental simulation device for extrusion molding process according to claim 8, characterized in that, The cutter (84) includes a blade (841), which is long and the length direction of the blade (841) is perpendicular to the cutting direction; one long side of the blade (841) forms a cutting edge (842), which is in contact with the bottom end face of the extrusion die (32).

10. The application method of the extrusion molding process experimental simulation device according to claim 1, characterized in that, Includes the following steps: Loading: Install the material cylinder on the base, load the material into the material cylinder, and then pre-compress the material inside the material cylinder; Extrusion molding: After pre-compression is completed, the barrel is installed on the extrusion die, and then the material inside the barrel is extruded; Calculate the pressure field and temperature field of pre-compression: During the pre-compression and extrusion process, the temperature and pressure signals inside the barrel are collected simultaneously and transmitted to the controller. The controller calculates the pressure field and temperature field based on the multiple temperature and pressure signals.

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