An injection molding machine

Abstract

The present invention discloses an injection molding machine, which relates to the technical field of injection molding machinery, including a base plate, a barrel is installed on the base plate, a screw sleeve is installed in the barrel, and a nozzle is connected to the output end of the barrel, and also includes: an electric slider, which is slidably installed on the base plate; a main shaft, which is rotatably connected to the electric slider, and a driving mechanism is connected to the electric slider, and the output end of the driving mechanism is connected to the main shaft; and an air supply sleeve. The present invention sets a driving mechanism, a transmission component and an air supply component. When the pressure of the molten material inside the barrel changes due to inflation, the force balance of the cutting blade will be changed, causing the torsion of the transmission shaft to change, which is detected by the torque sensor, thereby controlling the electric-controlled air pump to adjust the air pressure, and finally achieving a dynamic balance between the molten material and the inflation gas through real-time adjustment of the electric-controlled air pump, thereby preventing gas surges caused by pressure changes.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding machinery, in particular to an injection molding machine. Background Art

[0002] Polypropylene foam material, referred to as PP material, has become a hot spot in the foam plastic industry for its unique and superior performance. When using polypropylene foam material for injection molding production, when using physical microporous foaming technology, supercritical fluid is often used as a foaming agent and mixed evenly with the melt. In order to ensure that the gas injection process can proceed smoothly, the existing micro-foam injection molding gas injection device needs to maintain a certain difference between the gas pressure in the gas injection device and the pressure of the melt to avoid a large amount of gas rushing into the barrel at the moment the gas injector is opened, causing gas surges. The existence of gas surges will make the gas injection process uneven and cause problems with the final product.

[0003] In the prior art, an elastic diaphragm is used. When the pressure difference between the inside and outside of the gas cylinder is large, the elastic diaphragm is deformed, thereby controlling the pressure valve through the transmission structure to reduce the flow path of the supercritical fluid and avoid gas surges. In this way, the bubbles formed by the gas introduced into the barrel are not effectively processed and the mixing effect with the melt is poor, thereby reducing the uniformity of mixing. A number of gas injection holes with different heights and a tapered structure are set on the side wall of the hollow screw, and foaming gas is introduced into the barrel through the gas injection holes. In this way, the mixing area space is too large, which can easily lead to uneven mixing, which is not conducive to rapid foaming molding. Summary of the invention

[0004] The purpose of the present invention is to solve the problem in the prior art that bubbles formed by gas introduced into a barrel are not effectively processed and the mixing effect with the melt is poor, thereby reducing the uniformity of mixing, and to propose an injection molding machine.

[0005] In order to achieve the above object, the present invention adopts the following technical solution: an injection molding machine, comprising a base plate, a barrel is installed on the base plate, a screw sleeve is installed in the barrel, and a nozzle is connected to the output end of the barrel, and further comprising:

[0006] An electric slider, the electric slider being slidably mounted on the bottom plate;

[0007] A main rotating shaft, the main rotating shaft is rotatably connected to the electric slider, the electric slider is connected to a driving mechanism, and the output end of the driving mechanism is connected to the main rotating shaft;

[0008] A gas delivery sleeve, the gas delivery sleeve is fixedly connected to the electric slider, one end of the gas delivery sleeve coaxially extends into the screw sleeve, and the other end is rotatably connected to a gas connection shaft, the main shaft is coaxially located inside the gas delivery sleeve, the input end of the gas connection shaft is coaxially fixedly connected to the main shaft, a plurality of second rectangular air passages are opened in the inner wall of the gas delivery sleeve, the input end of the gas connection shaft is connected to an air supply assembly, and the output end is connected to three adjacent second rectangular air passages;

[0009] A processing rod, the processing rod is rotatably connected to one end of the main rotating shaft extending into the air delivery sleeve, a transmission assembly is connected to the output end of the driving mechanism, the output end of the transmission assembly is connected to the processing rod, a cutting blade is fixedly connected to the side of the processing rod, and the cutting blade seals the two second rectangular air passages connected to the air connecting shaft after rotating with the processing rod, a torque sensor is installed on the transmission assembly, and the torque sensor is electrically connected to the air supply assembly.

[0010] In the above-mentioned injection molding machine, a material storage box is fixedly connected to the base plate, the top of the material storage box is connected to a hopper, and the output end is connected to a barrel. A rotating port is opened at the end of the material storage box away from the barrel, and the end of the screw sleeve away from the barrel is sealed and rotatably matched with the rotating port, and is connected to the output end of an external gear drive device, and is arranged in an open manner. The air delivery sleeve and the main rotating shaft both extend into the screw sleeve through the opening, a mold clamp is installed on the base plate, a mold is installed on the mold clamp, and the nozzle output end is connected to the injection molding feed port on the mold.

[0011] In the above-mentioned injection molding machine, the electric slider includes a first slider and a second slider, a connecting tube is fixedly connected between the first slider and the second slider, an electric slide groove is provided on the bottom plate for sliding cooperation with the first slider and the second slider, the main shaft is rotatably connected to the first slider, a fixed sleeve is fixedly connected to the electric slider, the main shaft is coaxially rotatably cooperated with the inside of the fixed sleeve, the driving mechanism is connected to the first slider, and the air delivery sleeve is fixedly connected to the second slider.

[0012] In the above-mentioned injection molding machine, the driving mechanism includes a first motor, which is mounted on a first slider, and the output end is coaxially fixedly connected with a first gear, the first gear is meshed with a second gear, and the second gear is coaxially fixedly connected with the main shaft.

[0013] In the above-mentioned injection molding machine, the transmission assembly includes two transmission parts, and the two transmission parts are symmetrically distributed about the axis of the second gear. The transmission parts include a second motor, a transmission shaft and a sub-rotating shaft. The second motor is installed on the second gear. A connecting block is fixedly connected to the main rotating shaft, and the transmission shaft is rotatably connected to the connecting block. The output end of the second motor and one end of the transmission shaft are coaxially fixedly connected with a first bevel gear, and the two first bevel gears are meshed with each other. The sub-rotating shaft is coaxially fixedly connected to the processing rod, and the other end of the transmission shaft and the end of the sub-rotating shaft away from the processing rod are coaxially fixedly connected with a second bevel gear, and the two second bevel gears are meshed with each other. The torque sensor is installed on the transmission shaft, and a sealing sleeve is sealed and fixedly connected to the main rotating shaft, and the sealing sleeve is sealed with the inside of the air transmission sleeve, and a through hole for the transmission shaft seal to pass through is opened on the sealing sleeve.

[0014] In the above-mentioned injection molding machine, one end of the processing rod away from the cutting blade is fixedly connected with a counterweight block.

[0015] In the above-mentioned injection molding machine, the air supply component includes an electric-controlled air pump, the output end of the electric-controlled air pump is connected to a second air pipe, the air connecting shaft includes a connecting ring, a fixing ring and a rotating ventilation ring, the connecting ring is coaxially fixedly connected to the air delivery sleeve, and the end away from the air delivery sleeve is coaxially rotatably connected to the fixing ring, the end of the fixing ring away from the connecting ring is coaxially fixedly connected to the rotating ventilation ring, an annular groove is coaxially provided inside the rotating ventilation ring, the end of the second air pipe away from the electric-controlled air pump passes through the rotating ventilation ring and is connected to the annular groove, a square hole is provided on the fixing ring, and a plurality of first rectangular air channels are provided on the connecting ring, the plurality of first rectangular air channels correspond to the plurality of second rectangular air channels one by one and are connected to each other, one end of the square hole is connected to the annular groove, and the other end is connected to three adjacent first rectangular air channels, the torque sensor and the electric-controlled air pump are both electrically connected to a controller, the controller is mounted on a base plate, and the controller receives a signal from the torque sensor to control the working state of the electric-controlled air pump.

[0016] In the above-mentioned injection molding machine, the two second rectangular air channels sealed by the cutting blade after rotating with the processing rod are located on the back side of the third second rectangular air channel that is not sealed and rotates around the main rotating shaft, and a cutting net is fixedly connected between the cutting blade and the processing rod.

[0017] In the above-mentioned injection molding machine, the output end of the electric-controlled air pump is also connected to a first air pipe, and the end of the first air pipe away from the electric-controlled air pump is connected to a rotating air joint, a first air channel is opened in the main rotating shaft, and the rotating air joint is installed on the end of the main rotating shaft away from the barrel, and the output end is connected to the first air channel, a second air channel is opened in the processing rod, and when the processing rod and the main rotating shaft are in a coaxial state, the first air channel and the second air channel are connected to each other, and the end of the second air channel away from the first air channel is connected to the barrel.

[0018] In the above-mentioned injection molding machine, a material drop opening is provided at the bottom of the bottom plate, and the bottom of the material drop opening is connected to a collecting box, and the collecting box is located at the bottom of the nozzle.

[0019] Compared with the prior art, the advantages of the present invention are:

[0020] The present invention provides a driving mechanism, a transmission component and an air supply component. When the pressure of the melt inside the barrel changes due to inflation, the force balance of the cutting blade, that is, the balance between the limiting force of the transmission component and the pushing force of the air pressure of part of the gas not introduced and the pressure of the melt after the gas is introduced into the barrel, will be changed, so that the torque of the transmission shaft in the transmission component changes and is detected by the torque sensor, thereby controlling the electric control air pump to adjust the air pressure, and finally achieving a dynamic balance between the melt and the injected gas through real-time adjustment of the electric control air pump, preventing gas surges caused by pressure changes or the problem that the gas cannot be ejected due to the higher pressure of the melt. In the process of rotation of the processing rod, the cutting blade cooperates with the cutting net to cut the bubbles generated by the introduced gas, thereby improving the mixing effect and thus improving the material performance effect.

[0021] When the processing rod is in a non-coaxial state with the main shaft, the processing rod rotates with the main shaft to affect the PP material and supercritical CO in the space near the nozzle of the barrel. 2 The blend acts as a stirrer, making the CO 2 The gas core can be more evenly distributed in the PP melt to improve the processing performance of the material and the yield rate of the product.

[0022] The present invention arranges a processing rod and a gas transmission sleeve to carry out PP material and supercritical CO in a small space near the nozzle. 2 The mixing of the particles avoids the problem of uneven mixing caused by excessive mixing space in the mixing area of ​​large injection molding parts. Rapid mixing and spraying is also beneficial to foaming molding.

[0023] The present invention provides an electric slider and a first air channel and a second air channel. After the injection molding is completed, the transmission component works to make the processing rod and the main shaft coaxial, so that the first air channel and the second air channel are connected, and the electric control air pump works to spray high-pressure CO through the first air pipe, the rotating air joint, the first air channel and the second air channel. 2 Cleaning the nozzle allows the entire production process to be repaired without stopping the machine to solve the problem of nozzle blockage and to cycle through cleaning, thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the overall structure of an injection molding machine proposed by the present invention;

[0025] Figure 2 for Figure 1 The enlarged schematic diagram of part A in the middle;

[0026] Figure 3 This is a schematic structural diagram of an electric slider and a driving mechanism of an injection molding machine proposed by the present invention;

[0027] Figure 4 A schematic structural diagram of an electric slider and a driving mechanism of an injection molding machine proposed by the present invention from another perspective;

[0028] Figure 5 This is a schematic diagram of the exploded structure of an air connecting shaft of an injection molding machine proposed by the present invention;

[0029] Figure 6 A schematic diagram of a half-section structure of a barrel of an injection molding machine in the startup and injection molding completion states proposed by the present invention;

[0030] Figure 7 for Figure 6 The enlarged schematic diagram of part B in the middle;

[0031] Figure 8 This is a schematic diagram of the exploded structure of the connection part between the main rotating shaft and the processing rod of an injection molding machine proposed by the present invention;

[0032] Fig. 9 A schematic diagram of a half-section structure of a main rotating shaft and a processing rod of an injection molding machine in a coaxial state proposed by the present invention;

[0033] Fig.10 A schematic diagram of a half-section structure of a main rotating shaft and a processing rod of an injection molding machine proposed by the present invention in a non-coaxial state;

[0034] In the figure: 1, electric control air pump; 11, first air pipe; 12, second air pipe; 2, bottom plate; 21, electric slide; 22, hopper; 23, mold clamp; 24, collection box; 3, electric slider; 301, first slider; 302, connecting pipe; 303, second slider; 31, first motor; 311, first gear; 32, main shaft; 321, second gear; 322, second motor; 323, first bevel gear; 324, transmission shaft; 325, torque sensor; 32 6. Sealing sleeve; 327. First air channel; 33. Fixed sleeve; 34. Rotating air joint; 35. Air connecting shaft; 351. Fixed ring; 352. Rotating ventilation ring; 353. First rectangular air channel; 36. Air delivery sleeve; 361. Second rectangular air channel; 37. Processing rod; 371. Counterweight; 372. Sub-rotating shaft; 373. Second bevel gear; 374. Cutting net; 375. Cutting disc; 376. Second air channel; 4. Screw sleeve; 5. Barrel; 51. Nozzle. DETAILED DESCRIPTION

[0035] The following examples are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0036] Reference Figure 1-Figure 4 An injection molding machine includes a base plate 2, a barrel 5 is installed on the base plate 2, a screw sleeve 4 is installed in the barrel 5, and a nozzle 51 is connected to the output end of the barrel 5.

[0037] It also includes: an electric slider 3, which is slidably mounted on the bottom plate 2.

[0038] The electric slider 3 includes a first slider 301 and a second slider 303 , a connecting pipe 302 is fixedly connected between the first slider 301 and the second slider 303 , and an electric slide groove 21 slidably matched with the first slider 301 and the second slider 303 is provided on the bottom plate 2 .

[0039] The electric slider 3 adopts the existing technology and is electrically controlled to slide back and forth in the electric slide groove 21.

[0040] The main rotating shaft 32 is rotatably connected to the electric slider 3 . The electric slider 3 is connected to a driving mechanism, and an output end of the driving mechanism is connected to the main rotating shaft 32 .

[0041] The main shaft 32 is rotatably connected to the first slider 301 . A fixed sleeve 33 is fixedly connected to the electric slider 3 . The main shaft 32 rotates coaxially with the fixed sleeve 33 . The driving mechanism is connected to the first slider 301 .

[0042] The driving mechanism includes a first motor 31 , which is mounted on the first slider 301 , and the output end of the first motor 31 is coaxially fixedly connected with a first gear 311 , the first gear 311 is meshed with a second gear 321 , and the second gear 321 is coaxially fixedly connected with the main shaft 32 .

[0043] The air delivery sleeve 36 is fixedly connected to the electric slider 3, one end of the air delivery sleeve 36 coaxially extends into the screw sleeve 4, and the other end is rotatably connected to the air connecting shaft 35, the main rotating shaft 32 is coaxially located inside the air delivery sleeve 36, the input end of the air connecting shaft 35 is coaxially fixedly connected to the main rotating shaft 32, a plurality of second rectangular air channels 361 are opened in the inner wall of the air delivery sleeve 36, the input end of the air connecting shaft 35 is connected to the air supply component, and the output end is connected to three adjacent second rectangular air channels 361.

[0044] The gas delivery sleeve 36 is fixedly connected to the second sliding block 303 .

[0045] The air supply assembly comprises an electrically controlled air pump 1 , and an output end of the electrically controlled air pump 1 is connected to a second air pipe 12 .

[0046] Reference Figure 5The air connecting shaft 35 includes a connecting ring, a fixing ring 351 and a rotating ventilation ring 352. The connecting ring is coaxially fixedly connected to the air delivery sleeve 36, and the end away from the air delivery sleeve 36 is coaxially rotatably connected with the fixing ring 351. The end of the fixing ring 351 away from the connecting ring is coaxially fixedly connected with the rotating ventilation ring 352. An annular groove is coaxially provided inside the rotating ventilation ring 352. The end of the second air pipe 12 away from the electric-controlled air pump 1 passes through the rotating ventilation ring 352 and is connected with the annular groove. A square hole is provided on the fixing ring 351. A plurality of first rectangular air channels 353 are provided on the connecting ring. The plurality of first rectangular air channels 353 correspond to the plurality of second rectangular air channels 361 one by one and are connected with each other. One end of the square hole is connected with the annular groove, and the other end is connected with three adjacent first rectangular air channels 353. The torque sensor 325 and the electric-controlled air pump 1 are both electrically connected with a controller. The controller is mounted on the bottom plate 2. The controller receives the signal of the torque sensor 325 to control the working state of the electric-controlled air pump 1.

[0047] Reference Figure 3 , Figure 6-Figure 8 , a processing rod 37, the processing rod 37 is rotatably connected to one end of the main rotating shaft 32 extending into the air delivery sleeve 36, a transmission assembly is connected to the output end of the driving mechanism, the output end of the transmission assembly is connected to the processing rod 37, a cutting blade 375 is fixedly connected to the side of the processing rod 37, and the cutting blade 375 rotates with the processing rod 37 to seal the two second rectangular air passages 361 connected to the air connecting shaft 35, a torque sensor 325 is installed on the transmission assembly, and the torque sensor 325 is electrically connected to the air supply assembly.

[0048] The transmission assembly includes two transmission components, which are axially symmetrically distributed about the second gear 321. The transmission components include a second motor 322, a transmission shaft 324 and a sub-rotating shaft 372. The second motor 322 is installed on the second gear 321. A connecting block is fixedly connected to the main rotating shaft 32, and the transmission shaft 324 is rotatably connected to the connecting block. The output end of the second motor 322 and one end of the transmission shaft 324 are both coaxially fixedly connected with the first bevel gear 323, and the two first bevel gears 323 are meshed with each other. The sub-rotating shaft 372 is coaxially fixedly connected to the processing rod 37, and the other end of the transmission shaft 324 and the end of the sub-rotating shaft 372 away from the processing rod 37 are both coaxially fixedly connected with the second bevel gear 373, and the two second bevel gears 373 are meshed with each other. The torque sensor 325 is installed on the transmission shaft 324, and a sealing sleeve 326 is sealed and fixedly connected to the main rotating shaft 32. The sealing sleeve 326 is sealed with the inside of the air transmission sleeve 36, and a through hole for the transmission shaft 324 to pass through in a sealed manner is opened on the sealing sleeve 326.

[0049] When the second motor 322 is working, its output end drives the transmission shaft 324 to rotate through two vertically meshed first bevel gears 323. The transmission shaft 324 rotates through two vertically meshed second bevel gears 373 to drive the sub-rotating shaft 372 to rotate. The rotation of the two sub-rotating shafts 372 synchronously drives the processing rod 37 to rotate.

[0050] Multiple second rectangular air channels 361 are distributed in a circular array, and the distribution interval is equal to the width of the second rectangular air channel 361, so that when the cutting blade 375 is attached to the end face of the air delivery sleeve 36 and rotates, it continuously sweeps across multiple second rectangular air channel 361 ports, and the area of ​​the blocked second rectangular air channel 361 remains stable, so that the airflow pushing force it receives remains relatively stable, which is convenient for subsequent torque detection and control.

[0051] The end of the processing rod 37 away from the cutting blade 375 is fixedly connected with a counterweight block 371, which is fixed on the processing rod 37 for balancing to prevent the main shaft 32 from experiencing force changes due to centrifugal force during subsequent rotations, which affects the torque data collection of the torque sensor 325.

[0052] The two second rectangular air passages 361 sealed by the cutting blade 375 after rotating with the processing rod 37 are located on the back side of the third second rectangular air passage 361 that is not sealed and rotates around the main rotating shaft 32 . A cutting net 374 is fixedly connected between the cutting blade 375 and the processing rod 37 .

[0053] Reference Figure 3 and Figure 4 The output end of the electric-controlled air pump 1 is also connected to the first air pipe 11, and the end of the first air pipe 11 away from the electric-controlled air pump 1 is connected to a rotating air joint 34. A first air channel 327 is opened in the main rotating shaft 32, and the rotating air joint 34 is installed on the end of the main rotating shaft 32 away from the barrel 5, and the output end is connected to the first air channel 327. A second air channel 376 is opened in the processing rod 37. When the processing rod 37 and the main rotating shaft 32 are in a coaxial state, the first air channel 327 and the second air channel 376 are connected to each other, and the end of the second air channel 376 away from the first air channel 327 is connected to the barrel 5.

[0054] A material drop opening is provided at the bottom of the bottom plate 2 , and the bottom of the material drop opening is connected to a collecting box 24 . The collecting box 24 is located at the bottom of the nozzle 51 .

[0055] The screw sleeve 4, the gas delivery sleeve 36 and the main shaft 32 are all hollow structures.

[0056] Reference Figure 1A material storage box is fixedly connected to the bottom plate 2, a hopper 22 is connected to the top of the material storage box, and a barrel 5 is connected to the output end. A rotating port is opened at the end of the material storage box away from the barrel 5, and the end of the screw sleeve 4 away from the barrel 5 is sealed and rotatably matched with the rotating port, and is connected to the output end of the external gear drive device, and is arranged in an open manner. The air delivery sleeve 36 and the main rotating shaft 32 both extend into the screw sleeve 4 through the opening. A mold clamp 23 is installed on the bottom plate 2, and a mold is installed on the mold clamp 23. The output end of the nozzle 51 is connected to the injection molding feed port on the mold.

[0057] In the present invention, when working, PP material is first added into the storage box from the hopper 22, and the material enters the barrel 5 through the storage box. The external gear driving device drives the screw sleeve 4 to rotate, and the rotation of the screw sleeve 4 rotates and shears the material in the barrel 5 to melt the material and transport it to the vicinity of the nozzle 51 of the barrel 5. When the mold clamp 23 works, after the mold is closed, the mixed material is sprayed into the mold cavity of the mold through the nozzle 51 and the injection molding feed port of the mold to form an injection molding operation;

[0058] When the materials are mixed, the electric slider 3 drives the main shaft 32 and the gas delivery sleeve 36 to move synchronously to clear space at the front end of the barrel 5, thereby reserving space for subsequent inflation processing;

[0059] When inflating, the second motor 322 is started, and the output end of the second motor 322 drives the processing rod 37 to rotate through the first bevel gear 323, the transmission shaft 324, the second bevel gear 373 and the sub-rotating shaft 372 until the cutting blade 375 on the processing rod 37 is closely attached to the side end surface of the gas transmission sleeve 36 and covers the corresponding gas ports of the two second rectangular airways 361;

[0060] The second motor 322 is turned off, and the locker in the second motor 322 works to fix the output end of the second motor 322, thereby fixing the processing rod 37 connected by transmission along the axial direction of the sub-rotating shaft 372 and preventing it from rotating, so that when the processing rod 37 rotates along the main rotating shaft 32, the cutting blade 375 is always attached to the side end surface of the gas transmission sleeve 36;

[0061] The electric-controlled air pump 1 is started to work, and the second air pipe 12 at the output end of the electric-controlled air pump 1 transfers supercritical CO 2 That is, carbon dioxide is introduced into the rotating ventilation ring 352, and the rotating ventilation ring 352 is then introduced into the square hole on the fixed ring 351 through the internal annular groove, and is ventilated through the three first rectangular airways 353 on the connecting ring to supply air to the corresponding three second rectangular airways 361 on the air delivery sleeve 36. The size of the cutting blade 375 just covers two ventilated second rectangular airways 361, and there is another uncovered and ventilated second rectangular airway 361 that ejects gas outward during subsequent rotation, and the ejected gas is cut by the cutting blade 375.

[0062] The first motor 31 is started, and the output end of the first motor 31 rotates through the first gear 311 and the second gear 321 to drive the main shaft 32 to rotate, and the fixing ring 351 rotates with the main shaft 32, so that the plurality of second rectangular airways 361 are connected in sequence, and the cutting blade 375 rotates with the main shaft 32 through the processing rod 37, always covering the latter two of the three second rectangular airways 361 to be ventilated, so that the supercritical CO 2 The gas is discharged through the second rectangular air channel 361 not covered by the cutting blade 375, and is cut by the cutting blade 375 to form bubbles of uniform size during the rotation of the processing rod 37, and is further divided into smaller bubbles by the cutting net 374 fixed on both sides of the processing rod 37, thereby improving the mechanical, thermal insulation and energy absorption properties of the material;

[0063] At the same time, when the processing rod 37 is in a non-coaxial state with the main rotating shaft 32, the processing rod 37 rotates with the main rotating shaft 32 to form a contact between the PP material and the supercritical CO in the space near the nozzle 51 of the barrel 5. 2 The blend acts as a stirrer, making the CO 2 The gas core can be more evenly distributed in the PP melt to improve the processing performance of the material and the yield rate of the product;

[0064] At the same time, the faster the processing rod 37 rotates, the more times the cutting blade 375 divides the bubbles, the finer the CO2 bubbles are, and the lighter the material is, thereby achieving the effect of improving the material performance by controlling the rotation of the processing rod 37;

[0065] The PP material and supercritical CO are mixed in a small space near the nozzle 51. 2 The mixing also avoids the problem of uneven mixing caused by excessive mixing area in large injection molded parts;

[0066] During the ventilation process, the gas introduced into the portion of the second rectangular air channel 361 covered by the cutting blade 375 exerts a pushing force on the cutting blade 375. Usually, the combined force of the pressure of the PP melt on the cutting blade 375 and the torque applied by the rotation locking of the sub-rotating shaft 372 by the output end of the second motor 322 will form a balance with the force.

[0067] When the pressure of the PP melt changes, the force balance of the cutting blade 375 will be changed. However, since the rotation of the sub-rotating shaft 372 is locked, the object will change the torque applied by the rotation lock of the sub-rotating shaft 372 to maintain the original state, and then transmit it back to the transmission shaft 324 through the two second bevel gears 373. The torque applied to the transmission shaft 324 changes, resulting in a change in the torque value detected by the torque sensor 325 connected to the transmission shaft 324. The controller receives the electrical signal of the torque sensor 325 and controls the electronically controlled air pump 1 to change the ejection of supercritical CO. 2The pressure of the cutting blade 375 is balanced again, and finally the dynamic balance between the pressure of the PP melt and the ejected supercritical CO2 gas is controlled by the electronically controlled air pump 1, so as to prevent the gas surge caused by the pressure change or the problem that the gas cannot be ejected because the PP pressure is higher;

[0068] At the same time, during the rotation process, the screw sleeve 4 works to continuously feed the mixture to the nozzle 51 to complete the injection molding step;

[0069] When the injection molding process is completed, the second motor 322 is started to drive the processing rod 37 back to its original position and to be coaxial with the main shaft 32, so that the first air channel 327 and the second air channel 376 are connected. At the same time, the electric slider 3 works to drive the main shaft 32 and the gas delivery sleeve 36 to move, so that the processing rod 37 is pushed forward until the head of the processing rod 37 is completely stuck in the nozzle 51 of the barrel 5. At this time, the electronically controlled air pump 1 works to spray high-pressure gas into the first air channel 327 through the first air pipe 11 and into the first air channel 327 through the rotating air joint 34, and then spray it into the nozzle 51 of the barrel 5 through the second air channel 376 connected thereto, so that the residual material inside the nozzle 51 is ejected and falls into the collection box 24. After completing one injection molding process and cleaning of the nozzle 51, the process of producing the next product can be started. This method allows the entire production process to be able to clean the nozzle blockage problem without stopping the machine, thereby improving production efficiency.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An injection molding machine, comprising a base plate (2), a barrel (5) being mounted on the base plate (2), a screw sleeve (4) being mounted in the barrel (5), an output end of the barrel (5) being connected to a nozzle (51), characterized in that: Also includes: An electric slider (3), the electric slider (3) being slidably mounted on the bottom plate (2); A main rotating shaft (32), the main rotating shaft (32) being rotatably connected to the electric slider (3), the electric slider (3) being connected to a driving mechanism, the output end of the driving mechanism being connected to the main rotating shaft (32); A gas delivery sleeve (36), the gas delivery sleeve (36) is fixedly connected to the electric slider (3), one end of the gas delivery sleeve (36) coaxially extends into the screw sleeve (4), and the other end is rotatably connected to the gas connection shaft (35), the main rotating shaft (32) is coaxially located inside the gas delivery sleeve (36), the input end of the gas connection shaft (35) is coaxially fixedly connected to the main rotating shaft (32), a plurality of second rectangular air channels (361) are opened in the inner wall of the gas delivery sleeve (36), the input end of the gas connection shaft (35) is connected to the gas supply component, and the output end is connected to three adjacent second rectangular air channels (361), the gas supply component comprises an electric-controlled air pump (1), the output end of the electric-controlled air pump (1) is connected to the second air pipe (12), the gas connection shaft (35) comprises a connecting ring, a fixing ring (351) and a rotating ventilation ring (35 2), the connecting ring is coaxially fixedly connected to the gas delivery sleeve (36), and the end away from the gas delivery sleeve (36) is coaxially rotatably connected to a fixing ring (351), the end of the fixing ring (351) away from the connecting ring is coaxially fixedly connected to a rotating ventilation ring (352), the rotating ventilation ring (352) is coaxially provided with an annular groove, the end of the second air pipe (12) away from the electric control air pump (1) passes through the rotating ventilation ring (352) and is connected to the annular groove, the fixing ring (351) is provided with a square hole, the connecting ring is provided with a plurality of first rectangular air channels (353), the plurality of first rectangular air channels (353) correspond to the plurality of second rectangular air channels (361) one by one, and are connected to each other, one end of the square hole is connected to the annular groove, and the other end is connected to three adjacent first rectangular air channels (353); A processing rod (37), the processing rod (37) being rotatably connected to one end of the main rotating shaft (32) extending into the gas delivery sleeve (36), the output end of the driving mechanism being connected to a transmission assembly, the output end of the transmission assembly being connected to the processing rod (37), a cutting blade (375) being fixedly connected to the side of the processing rod (37), the cutting blade (375) sealing two second rectangular air passages (361) in communication with the gas connection shaft (35) after rotating with the processing rod (37), a torque sensor (325) being mounted on the transmission assembly, the torque sensor (325) being electrically connected to the gas supply assembly.

2. An injection molding machine according to claim 1, characterized in that: A material storage box is fixedly connected to the bottom plate (2), the top of the material storage box is connected to a hopper (22), and the output end is connected to a barrel (5), a rotating opening is provided at one end of the material storage box away from the barrel (5), the end of the screw sleeve (4) away from the barrel (5) is sealed and rotatably matched with the rotating opening, and is connected to the output end of an external gear drive device, and is arranged in an open manner, the air delivery sleeve (36) and the main rotating shaft (32) both extend into the screw sleeve (4) through the opening, a mold clamp (23) is installed on the bottom plate (2), a mold is installed on the mold clamp (23), and the output end of the nozzle (51) is connected to the injection molding feed port on the mold.

3. An injection molding machine according to claim 1, characterized in that: The electric slider (3) comprises a first slider (301) and a second slider (303); a connecting pipe (302) is fixedly connected between the first slider (301) and the second slider (303); an electric slider groove (21) is provided on the bottom plate (2) and is slidably matched with the first slider (301) and the second slider (303); the main rotating shaft (32) is rotatably connected to the first slider (301); a fixed sleeve (33) is fixedly connected to the electric slider (3); the main rotating shaft (32) and the fixed sleeve (33) are coaxially rotatably matched inside; the driving mechanism is connected to the first slider (301); and the gas transmission sleeve (36) is fixedly connected to the second slider (303).

4. An injection molding machine according to claim 3, characterized in that: The driving mechanism comprises a first motor (31), the first motor (31) being mounted on a first slider (301), and the output end of the first motor (31) being coaxially fixedly connected to a first gear (311), the first gear (311) being meshed with a second gear (321), and the second gear (321) being coaxially fixedly connected to a main rotating shaft (32).

5. An injection molding machine according to claim 4, characterized in that: The transmission assembly comprises two transmission components, the two transmission components are axially symmetrically distributed about the second gear (321), the transmission components comprise a second motor (322), a transmission shaft (324) and a sub-rotating shaft (372), the second motor (322) is mounted on the second gear (321), a connecting block is fixedly connected to the main rotating shaft (32), the transmission shaft (324) is rotatably connected to the connecting block, the output end of the second motor (322) and one end of the transmission shaft (324) are both coaxially fixedly connected to a first bevel gear (323), and the two first bevel gears (323) are meshed with each other. The sub-rotating shaft (372) is coaxially fixedly connected to the processing rod (37); the other end of the transmission shaft (324) and the end of the sub-rotating shaft (372) away from the processing rod (37) are coaxially fixedly connected to a second bevel gear (373); the two second bevel gears (373) are meshed with each other; the torque sensor (325) is mounted on the transmission shaft (324); a sealing sleeve (326) is sealingly fixedly connected to the main rotating shaft (32); the sealing sleeve (326) is in sealing cooperation with the inside of the air transmission sleeve (36); and a through opening is provided on the sealing sleeve (326) for the transmission shaft (324) to pass through in a sealed manner.

6. The injection molding machine according to claim 1, characterized in that: One end of the processing rod (37) away from the cutting blade (375) is fixedly connected to a counterweight block (371).

7. An injection molding machine according to claim 5, characterized in that: The torque sensor (325) and the electrically controlled air pump (1) are both electrically connected to a controller, the controller being mounted on the base plate (2), and the controller receiving a signal from the torque sensor (325) to control the working state of the electrically controlled air pump (1).

8. An injection molding machine according to claim 7, characterized in that: The two second rectangular air passages (361) sealed by the cutting blade (375) after rotating with the processing rod (37) are located on the back side of the third second rectangular air passage (361) that is not sealed and rotates around the main rotating shaft (32), and a cutting net (374) is fixedly connected between the cutting blade (375) and the processing rod (37).

9. An injection molding machine according to claim 7, characterized in that: The output end of the electric-controlled air pump (1) is also connected to a first air pipe (11); the end of the first air pipe (11) away from the electric-controlled air pump (1) is connected to a rotating air joint (34); a first air passage (327) is provided in the main rotating shaft (32); the rotating air joint (34) is installed on the end of the main rotating shaft (32) away from the barrel (5), and the output end is connected to the first air passage (327); a second air passage (376) is provided in the processing rod (37); when the processing rod (37) and the main rotating shaft (32) are in a coaxial state, the first air passage (327) and the second air passage (376) are connected to each other; the end of the second air passage (376) away from the first air passage (327) is connected to the barrel (5).

10. An injection molding machine according to claim 9, characterized in that: A material drop opening is provided at the bottom of the bottom plate (2), and the bottom of the material drop opening is connected to a collection box (24), and the collection box (24) is located at the bottom of the nozzle (51).

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