Anti-stick plastic injection molding machine for plastic trash can and molding process thereof

Abstract

The invention relates to the field of plastic injection molding machines, and in particular to an anti-sticking plastic injection molding machine for a plastic trash can and a molding process thereof. The machine comprises a base and a barrel, and also comprises a fixed end, an outer mold movably installed in the fixed end, a movable end and an inner mold movably installed on the movable end. The fixed end, the movable end and the barrel are all installed on the base. The movable end is used to move along the base and drive the inner mold to close the mold with the outer mold. The barrel is used to move along the base to the fixed end and inject plastic between the outer mold and the inner mold. A driving chamber is installed on one side of the fixed end. A forward transmission component for driving the outer mold to rotate is provided between the driving chamber and the outer mold. A reverse transmission component for driving the inner mold to rotate is provided between the movable end and the inner mold. The invention adopts the method of forward and reverse rotation of the outer mold and the inner mold to interrupt the local adhesion between the plastic trash can and the outer mold and the inner mold, so as to avoid the adhesion of the plastic trash can being stretched and deformed, and to prevent the trash can from being partially pulled to cause damage to the barrel wall.

Description

Technical Field

[0001] The invention relates to the field of plastic injection molding machines, in particular to an anti-sticking plastic injection molding machine for a plastic trash can and a molding process thereof. Background Art

[0002] At present, domestic injection molding machines are mainly disc machines, which are used for common plastics such as PVC, TPR, PU, ​​PP, etc. The plastic injection molding process needs to be heated, but too low or too high temperature will cause mold sticking. Now plastic injection molding machines all use a built-in cooling system, using the fluidity and shrinkage rate of plastic raw materials. After injection molding, the plastic parts are cooled to accelerate their solidification and shrinkage, and then separated from the mold.

[0003] Round plastic trash cans are mostly made of PP plastic raw materials. The injection molding temperature is low and the texture is softer after molding. However, the inner and outer wall surface areas of this plastic bucket are large, and the contact surface with the mold is large. The cooling system in the plastic injection molding machine sometimes cannot evenly cool all surfaces of the plastic trash can. If the cooling system of the injection molding machine fails, this situation may also occur, which will lead to insufficient shrinkage on the surface of the plastic trash can. Even if the plastic trash can has been fully cooled and solidified in the mold state, it is possible that the plastic trash can is partially stuck to the mold surface and is not completely detached. If in this case, the existing pull-out mold opening method is directly used to open the mold and take out the plastic trash can, the adhesion between the plastic trash can and the mold will continue to be subjected to tensile stress in the same direction. This tensile stress may break the adhesion between the plastic trash can and the mold, but if the adhesion is firm and tight, it may also pull and deform the wall of the trash can, or even cause the adhesion of the wall to tear, especially the trash can made of PP material, which has a thinner wall thickness and a softer texture, which is more likely to cause damage to the trash can.

[0004] Therefore, when the above-mentioned existing plastic injection molding machine is used to process a plastic trash can, if the trash can cools and shrinks unevenly, there will be local adhesion between the trash can and the mold. At this time, the traditional pull-out mold opening method is used, which may tear the bonding part of the trash can wall. A plastic injection molding machine with a rotary mold can be designed to use forward and reverse rotating molds to break the bonding part between the plastic trash can and the mold. The rotational force is converted into tangential forces in different directions to replace the linear pulling force generated by the pull-out mold opening, so that the bonding part of the plastic trash can is better broken and it is not easy to tear the wall of the trash can. Summary of the invention

[0005] In order to overcome the problem that the plastic trash can is partially stuck to the mold due to uneven cooling and shrinkage during the injection molding process, if the traditional pull-out mold opening method is used, the bonding part of the trash can wall may be torn, damaging the trash can.

[0006] The technical solution of the present invention is: an anti-sticking plastic injection molding machine for a plastic trash can and a molding process thereof, comprising a machine base and a barrel, and also comprising a fixed end, an outer mold movably installed in the fixed end, a movable end and an inner mold movably installed on the movable end, the fixed end, the movable end and the barrel are all installed on the machine base, the movable end is used to move along the machine base and drive the inner mold and the outer mold to close the mold, the barrel is used to move along the machine base to the fixed end and inject plastic between the outer mold and the inner mold, a driving chamber is installed on one side of the fixed end, a forward transmission component for driving the outer mold to rotate is provided between the driving chamber and the outer mold, and a transmission component for driving the inner mold to rotate is provided between the movable end and the inner mold The reverse transmission component of the invention comprises an outer gear ring, a No. 1 driving gear and a No. 1 motor, wherein the outer gear ring is fixedly connected to the outer wall of the outer mold, the No. 1 driving gear is arranged in the driving bin and meshingly connected with the outer gear ring, the No. 1 motor is installed on the driving bin, and the No. 1 driving gear is connected to the output end of the No. 1 motor; the reverse transmission component comprises a No. 2 motor, a No. 2 driving gear and an inner gear ring, the No. 2 motor is installed in the cavity in the mobile end, the No. 2 driving gear is connected to the output end of the No. 2 motor, the inner gear ring is arranged in the middle of the inner mold, and the No. 2 driving gear is meshingly connected with the inner gear ring.

[0007] Preferably, a No. 1 embedding groove with an annular structure is provided on the bottom wall of the outer mold, and a No. 1 opening connected to the cavity in the fixed end is provided on the inner wall of the No. 1 embedding groove, and a No. 2 opening connected to the cavity in the movable end is provided on the inner wall of the inner mold.

[0008] Preferably, a No. 1 pressing mechanism and a No. 2 pressing mechanism are installed on the fixed end and the movable end respectively, and the No. 1 pressing mechanism and the No. 2 pressing mechanism pass through the No. 1 opening and the No. 2 opening respectively. The No. 1 pressing mechanism and the No. 2 pressing mechanism are both used to apply pressure to the plastic trash can, and the No. 1 pressing mechanism and the No. 2 pressing mechanism are symmetrically arranged.

[0009] Preferably, the No. 1 pressing mechanism includes an inner cylinder and an inner ring pressure plate, the No. 1 inner cylinder is installed on the inner wall of the cavity in the fixed end, the No. 1 inner ring pressure plate is connected to the output end of the No. 1 inner cylinder, the No. 1 inner ring pressure plate is embedded in the No. 1 fitting groove, and the surface of the No. 1 inner ring pressure plate is flush with the bottom wall of the outer mold; the No. 2 pressing mechanism includes an inner cylinder (1005) and an inner ring pressure plate, the No. 2 inner cylinder is installed on the inner wall of the cavity in the movable end, the No. 2 inner ring pressure plate is connected to the output end of the No. 2 inner cylinder, the No. 2 inner ring pressure plate is embedded in the No. 2 fitting groove, and the surface of the No. 2 inner ring pressure plate is flush with the bottom wall of the inner mold; the No. 1 inner cylinder and the No. 2 inner cylinder are respectively used to drive the No. 1 inner ring pressure plate and the No. 2 inner ring pressure plate to press against each other and lock them on the bottom wall of the plastic trash can.

[0010] Preferably, a No. 3 pressing mechanism and a No. 4 pressing mechanism are installed on the fixed end and the movable end respectively. The No. 3 pressing mechanism is concentrically arranged around the periphery of the No. 1 pressing mechanism, and the No. 4 pressing mechanism is concentrically arranged around the periphery of the No. 2 pressing mechanism. The No. 3 pressing mechanism and the No. 4 pressing mechanism pass through the No. 1 opening and the No. 2 opening respectively. The No. 3 pressing mechanism and the No. 4 pressing mechanism are both used to apply pressure to the plastic trash can, and the No. 3 pressing mechanism and the No. 4 pressing mechanism are symmetrically arranged.

[0011] Preferably, the No. 3 pressing mechanism includes an outer layer cylinder and an outer ring pressure plate, the outer layer cylinder No. 1 is installed on the inner wall of the cavity in the fixed end, the outer ring pressure plate No. 1 is connected to the output end of the outer layer cylinder No. 1, the outer ring pressure plate No. 1 is embedded in the No. 1 interlocking groove, and the surface of the outer ring pressure plate No. 1 is flush with the bottom wall of the outer mold; the No. 4 pressing mechanism includes an outer layer cylinder No. 2 and an outer ring pressure plate No. 2, the outer layer cylinder No. 2 is installed on the inner wall of the cavity in the movable end, the outer ring pressure plate No. 2 is connected to the output end of the outer layer cylinder No. 2, the outer ring pressure plate No. 2 is embedded in the No. 2 interlocking groove, and the surface of the outer ring pressure plate No. 2 is flush with the bottom wall of the inner mold; the No. 1 outer layer cylinder and the No. 2 outer layer cylinder are respectively used to drive the No. 1 outer ring pressure plate and the No. 2 outer ring pressure plate to press against each other and lock them on the bottom wall of the plastic trash can.

[0012] Preferably, a sealing structure No. 1 and a sealing structure No. 2 are installed on the fixed end and the movable end respectively. The sealing structure No. 1 is used to block the gap between the No. 1 pressing mechanism, the No. 3 pressing mechanism and the No. 1 interlocking groove, and the sealing structure No. 2 is used to block the gap between the No. 2 pressing mechanism, the No. 4 pressing mechanism and the No. 2 interlocking groove.

[0013] Preferably, the No. 1 sealing structure includes a No. 1 micro air pump, a No. 1 back plate and a No. 1 sealing rubber airbag, the No. 1 micro air pump is installed in the cavity of the fixed end, the No. 1 back plate is connected to the No. 1 sealing rubber airbag, and both are arranged in the No. 1 interlocking groove, the No. 1 back plate covers the No. 1 passage, the No. 1 micro air pump inflates the No. 1 sealing rubber airbag through a hose, and the No. 1 sealing rubber airbag expands and fills the No. 1 interlocking groove; the No. 2 sealing structure includes a No. 2 micro air pump, a No. 2 back plate and a No. 2 sealing rubber airbag, the No. 2 micro air pump is installed in the cavity of the mobile end, the No. 2 back plate is connected to the No. 2 sealing rubber airbag, and both are arranged in the No. 2 interlocking groove, the No. 2 back plate covers the No. 2 passage, the No. 2 micro air pump inflates the No. 2 sealing rubber airbag through a hose, and the No. 2 sealing rubber airbag expands and fills the No. 2 interlocking groove.

[0014] Preferably, the forward transmission assembly and the reverse transmission assembly are respectively equipped with a first torque detection mechanism and a second torque detection mechanism for detecting the torque change data of the two, the first torque detection mechanism is electrically connected to the No. 1 pressing mechanism and the No. 2 pressing mechanism, and the second torque detection mechanism is electrically connected to the No. 3 pressing mechanism and the No. 4 pressing mechanism; the first torque detection mechanism includes a No. 1 torque sensor and a No. 1 torsion spring, a side shaft is fixedly connected to the No. 1 driving gear, the side shaft is movably connected to the output end of the No. 1 motor, the No. 1 torsion spring is sleeved on the outside of the side shaft and the output end of the No. 1 motor, and the No. 1 torque sensor is installed at the output end of the No. 1 motor. On the top, one end of the No. 1 torsion spring is connected to the No. 1 torque sensor, and the other end is connected to the No. 1 driving gear. The No. 1 torque sensor detects the torque change data of the No. 1 torsion spring; the second torque detection mechanism includes a No. 2 torque sensor and a No. 2 torsion spring. The No. 2 driving gear is fixedly connected with a middle shaft rod, and the middle shaft rod is movably connected to the output end of the No. 2 motor. The No. 2 torsion spring is sleeved on the outside of the middle shaft rod and the output end of the No. 2 motor. The No. 2 torque sensor is installed on the output end of the No. 2 motor. One end of the No. 2 torsion spring is connected to the No. 2 torque sensor, and the other end is connected to the No. 2 driving gear. The No. 2 torque sensor detects the torque change data of the No. 2 torsion spring.

[0015] A non-stick plastic injection molding process for a plastic trash can, using the non-stick plastic injection molding machine for a plastic trash can as described above, comprises the following steps:

[0016] Step S1: The mobile end moves along the base toward the fixed end until the inner mold and the outer mold are closed, and the barrel also moves along the base toward the fixed end until the injection port enters the outer mold, and the No. 1 sealing structure and the No. 2 sealing structure are activated to seal the structural gaps on the outer mold and the inner mold. Then, the plastic raw material is injected into the mold cavity formed by the outer mold and the inner mold through the barrel, and is cooled, shrunk, solidified, and molded by the built-in cooling system of the injection molding machine;

[0017] Step S2: In the mold closing state, the forward transmission component drives the outer mold to rotate clockwise, and at the same time, the reverse transmission component drives the inner mold to rotate counterclockwise;

[0018] Step S3: When the outer mold and the inner mold rotate in opposite directions at the same time, the first torque detection mechanism and the second torque detection mechanism detect the torque changes of the forward transmission component and the reverse transmission component respectively, and the detection results are divided into the following three cases:

[0019] When the time point of the torque reset signal of the forward transmission component is detected to be the same as the time point of the torque reset signal of the reverse transmission component, it indicates that the bonding forces between the plastic trash can and the outer mold and the inner mold are the same, and the adhesions between the molded plastic trash can and the outer mold and the inner mold are simultaneously broken by the rotational tension;

[0020] Or, when the time point of the torque reset signal of the forward transmission component is detected earlier than the time point of the torque reset signal of the reverse transmission component, it means that the bonding force between the plastic trash can and the outer mold is smaller than the bonding force between the plastic trash can and the inner mold, and the plastic trash can rotates with the inner mold, and the adhesion between the plastic trash can and the inner mold cannot be broken, while the adhesion between the plastic trash can and the outer mold is broken first. At this time, the No. 1 pressing mechanism and the No. 2 pressing mechanism are started to lock the plastic trash can, and the inner mold is directly rotated to break the adhesion between the plastic trash can and the inner mold. At the same time, the second torque detection mechanism detects the torque change of the reverse transmission component, and determines whether the adhesion is broken by whether the torque signal is lost;

[0021] Or, when the time point of detecting the torque reset signal of the forward transmission component is later than the time point of detecting the torque reset signal of the reverse transmission component, it indicates that the bonding force between the plastic trash can and the outer mold is greater than the bonding force between the plastic trash can and the inner mold, and the plastic trash can rotates with the outer mold, and the adhesion between the plastic trash can and the outer mold cannot be broken, while the adhesion between the plastic trash can and the inner mold is broken first. At this time, the No. 1 pressing mechanism and the No. 2 pressing mechanism are started to lock the plastic trash can, and the outer mold is directly rotated to break the adhesion between the plastic trash can and the outer mold. At the same time, the first torque detection mechanism detects the torque change of the forward transmission component, and determines whether the adhesion is broken by whether the torque signal is lost;

[0022] S4: When the first torque detection mechanism and the second torque detection mechanism cannot identify the loss of the torque signal in the preset rotation stroke, it means that the locking force of the No. 1 pressing mechanism and the No. 2 pressing mechanism on the plastic trash can is smaller than the bonding force between the plastic trash can and the outer mold or the inner mold, and the plastic trash can is not completely locked and still rotates synchronously with the outer mold or the inner mold. At this time, the No. 3 pressing mechanism and the No. 4 pressing mechanism are started to increase the friction locking area of ​​the plastic trash can. At this time, the outer mold or the inner mold is rotated again to break the sticky part;

[0023] S5: When the plastic trash can is completely separated from the outer mold or the inner mold, the movable end moves along the base again and disengages from the fixed end until the inner mold is separated from the outer mold, and the plastic trash can is removed from the inner mold.

[0024] Beneficial effects of the present invention:

[0025] 1. The outer mold and the inner mold are rotated forward and backward to break the local adhesion between the plastic trash can and the outer mold and the inner mold, instead of the traditional pull-out mold opening to break the adhesion. The forces in different tangential directions generated by the rotation are compared with the linear forces in a fixed direction generated by the pull-out method. The breaking effect of the bonding part is good, which can effectively avoid the stretching and deformation of the adhesion of the plastic trash can, prevent the trash can wall from being damaged due to local adhesion and tension, and ensure the molding quality of the plastic trash can;

[0026] 2. Through the setting of the No. 1 pressing mechanism, the bottom wall of the plastic trash can can be squeezed and locked to avoid the situation where the trash can body continues to rotate with the outer mold or the inner mold due to the different bonding forces between the plastic trash can and the inner and outer molds, making it difficult to completely separate;

[0027] 3. If the friction locking force between the No. 1 pressing mechanism and the bottom wall of the trash can is insufficient, that is, the friction force is less than the bonding force between the trash can and the inner and outer molds, the trash can body will continue to rotate with the outer mold or the inner mold. At this time, the No. 2 pressing mechanism can be used to further lock the bottom wall of the trash can, increase the friction area, and increase the friction resistance to ensure that the bonding between the trash can and the inner and outer molds can be completely rotated and disconnected;

[0028] 4. Use the sealing structure to seal the structural gaps between the No. 1 and No. 2 top pressing mechanisms and the inner and outer molds. When the barrel is injected with plastic, it can effectively prevent the fluid material from flowing into the gaps, resulting in material loss and convex ridges on the bottom wall surface of the plastic trash can after molding, thereby improving the molding quality of the plastic trash can;

[0029] 5. The torque detection mechanism is used to detect the torque generated during the operation of the forward transmission component and the reverse transmission component, and the size of the bonding force between the plastic trash can and the inner and outer molds is judged by the time difference of the torque reset signal, and the state of rotational disconnection is inferred. According to the detection results, the No. 1 pressing mechanism and the No. 2 pressing mechanism are selectively used. If the bonding force between the plastic trash can and the inner and outer molds is the same, the No. 1 pressing mechanism and the No. 2 pressing mechanism are not required during rotational disconnection, and there is no need to operate the No. 1 pressing mechanism and the No. 2 pressing mechanism at the beginning, which reduces the energy consumption of equipment operation and reduces structural wear. At the same time, it also reduces the possibility of raw material residues mixing into the structural gaps on the inner and outer molds due to frequent operation of the No. 1 pressing mechanism and the No. 2 pressing mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1Shown is a schematic diagram of the three-dimensional structure of the anti-sticking plastic injection molding machine for plastic trash cans and its molding process of the present invention;

[0031] Figure 2 Shown is a schematic diagram of the front structure of the anti-sticking plastic injection molding machine for plastic trash cans and its molding process of the present invention;

[0032] Figure 3 Shown is a schematic diagram of the cross-sectional structure of the anti-sticking plastic injection molding machine for a plastic trash can and its molding process of the present invention;

[0033] Figure 4 Shown is a schematic diagram of the first three-dimensional structure of the anti-sticking plastic injection molding machine for a plastic trash can and its molding process, wherein the outer mold and the inner mold are aligned;

[0034] Figure 5 Shown is a second three-dimensional structure schematic diagram of the anti-sticking plastic injection molding machine for a plastic trash can and its molding process, wherein the outer mold and the inner mold are aligned;

[0035] Figure 6 Shown is a schematic diagram of the front structure of the anti-sticking plastic injection molding machine for a plastic trash can and its molding process, the outer mold and the inner mold alignment;

[0036] Figure 7 Shown is a partially enlarged structural schematic diagram of the anti-sticking plastic injection molding machine for a plastic trash can and its molding process A of the present invention;

[0037] Figure 8 Shown is a schematic diagram of the partially enlarged structure of the anti-sticking plastic injection molding machine for plastic trash cans and its molding process B of the present invention;

[0038] Fig. 9 Shown is a schematic diagram of the three-dimensional structure of the anti-sticking plastic injection molding machine for plastic trash cans of the present invention and its molding process outer mold and forward transmission assembly;

[0039] Fig.10 Shown is a schematic diagram of the front structure of the anti-sticking plastic injection molding machine for plastic trash cans of the present invention and its molding process outer mold and forward transmission assembly;

[0040] Fig.11 Shown is a schematic diagram of the side structure of the anti-sticking plastic injection molding machine for plastic trash cans of the present invention and its molding process outer mold and forward transmission assembly;

[0041] Fig.12 Shown is a schematic diagram of the internal structure of the drive bin of the anti-sticking plastic injection molding machine for plastic trash cans and its molding process of the present invention;

[0042] Fig.13Shown is a schematic diagram of the three-dimensional structure of the anti-sticking plastic injection molding machine for a plastic trash can and its molding process No. 1 top pressing mechanism and No. 3 top pressing mechanism;

[0043] Fig.14 Shown is a schematic diagram of the front structure of the No. 1 top pressing mechanism and the No. 3 top pressing mechanism of the anti-sticking plastic injection molding machine for a plastic trash can and its molding process of the present invention;

[0044] Fig.15 Shown is a schematic diagram of the three-dimensional structure of the anti-sticking plastic injection molding machine for plastic trash cans and the reverse transmission assembly of the molding process thereof of the present invention;

[0045] Fig.16 Shown is a schematic diagram of the front structure of the anti-sticking plastic injection molding machine for plastic trash cans and the reverse transmission assembly of the molding process of the present invention;

[0046] Fig.17 Shown is a schematic diagram of the three-dimensional structure of the No. 2 top pressing mechanism and the No. 4 top pressing mechanism of the anti-sticking plastic injection molding machine for a plastic trash can of the present invention and its molding process;

[0047] Fig.18 Shown is a schematic diagram of the front structure of the No. 2 top pressing mechanism and the No. 4 top pressing mechanism of the anti-sticking plastic injection molding machine for a plastic trash can of the present invention and its molding process;

[0048] Fig.19 Shown is a schematic diagram of the three-dimensional structure of the inner mold of the anti-sticking plastic injection molding machine for a plastic trash can and its molding process of the present invention;

[0049] Fig. 20 Shown is a schematic diagram of the side structure of the inner mold of the anti-stick plastic injection molding machine for plastic trash cans and its molding process of the present invention.

[0050] Description of the accompanying drawings: 1, machine base; 2, fixed end; 3, outer mold; 4, mobile end; 5, inner mold; 6, barrel; 7, driving chamber; 801, outer gear ring; 802, driving gear No. 1; 803, motor No. 1; 901, motor No. 2; 902, driving gear No. 2; 903, inner gear ring; 1001, inner cylinder No. 1; 1002, inner ring pressure piece No. 1; 1003, outer cylinder No. 1; 1004, outer ring pressure piece No. 1; 1005, inner cylinder No. 2; 1006, inner ring pressure piece No. 2; 1007, No. 2 outer cylinder; 1008, No. 2 outer ring pressure piece; 11, No. 1 fitting groove; 12, No. 1 opening; 13, No. 2 fitting groove; 14, No. 2 opening; 1501, No. 1 micro air pump; 1502, No. 1 back plate; 1503, No. 1 sealing rubber airbag; 1504, No. 2 micro air pump; 1505, No. 2 back plate; 1506, No. 2 sealing rubber airbag; 16, side shaft rod; 17, No. 1 torque sensor; 18, No. 1 torsion spring; 19, middle shaft rod; 20, No. 2 torque sensor; 21, No. 2 torsion spring. DETAILED DESCRIPTION

[0051] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0052] See also Figure 1-Figure 20 The present invention provides an embodiment: an anti-sticking plastic injection molding machine for a plastic trash can and a molding process thereof, comprising a base 1 and a barrel 6, and also comprising a fixed end 2, an outer mold 3 movably installed in the fixed end 2, a movable end 4 and an inner mold 5 movably installed on the movable end 4, the fixed end 2, the movable end 4 and the barrel 6 are all installed on the base 1, the movable end 4 is used to move along the base 1 and drive the inner mold 5 to close the mold with the outer mold 3, the barrel 6 is used to move along the base 1 to the fixed end 2 and inject plastic between the outer mold 3 and the inner mold 5, a driving bin 7 is installed on one side of the fixed end 2, a forward transmission component for driving the outer mold 3 to rotate is provided between the driving bin 7 and the outer mold 3, a reverse transmission component for driving the inner mold 5 to rotate is provided between the movable end 4 and the inner mold 5, and the rotation direction of the outer mold 3 The forward transmission assembly includes an outer gear ring 801, a first driving gear 802 and a first motor 803, the outer gear ring 801 is fixedly connected to the outer wall of the outer mold 3, the first driving gear 802 is arranged in the driving compartment 7, and is meshed with the outer gear ring 801, the first motor 803 is installed on the driving compartment 7, and the first driving gear 802 is connected to the output end of the first motor 803; the reverse transmission assembly includes a second motor 901, a second driving gear 902 and an inner gear ring 903, the second motor 901 is installed in the cavity in the mobile end 4, the second driving gear 902 is connected to the output end of the second motor 901, the inner gear ring 903 is arranged in the middle of the inner mold 5, and the second driving gear 902 is meshed with the inner gear ring 903;

[0053] The No. 1 motor 803 drives the No. 1 driving gear 802 to rotate, and drives the outer mold 3 to rotate through the meshing connection with the outer gear ring 801. The No. 2 motor 901 drives the No. 2 driving gear 902 to rotate, and drives the inner mold 5 to rotate through the meshing connection with the inner gear ring 903. The rotation directions of the outer mold 3 and the inner mold 5 are opposite, and the rotation speeds are consistent.

[0054] See also Figure 4 , Fig. 9 , Fig.11 , Fig.19 , Fig. 20 In this embodiment, a No. 1 embedding groove 11 of an annular structure is provided on the bottom wall of the outer mold 3, and a No. 1 opening 12 connected to the cavity in the fixed end 2 is provided on the inner wall of the No. 1 embedding groove 11, and a No. 2 opening 14 connected to the cavity in the movable end 4 is provided on the bottom wall of the inner mold 5. The No. 1 opening 12 and the No. 2 opening 14 are both arc-shaped groove structures, and the arc centers overlap with the centers of the outer mold 3 and the inner mold 5 respectively.

[0055] See also Figure 4-Figure 14In this embodiment, a No. 1 pressing mechanism and a No. 2 pressing mechanism are respectively installed on the fixed end 2 and the movable end 4, and the No. 1 pressing mechanism and the No. 2 pressing mechanism pass through the No. 1 opening 12 and the No. 2 opening 14 respectively. The No. 1 pressing mechanism and the No. 2 pressing mechanism are both used to apply pressure to the plastic trash can, and the No. 1 pressing mechanism and the No. 2 pressing mechanism are symmetrically arranged; the No. 1 pressing mechanism includes a No. 1 inner layer cylinder 1001 and a No. 1 inner ring pressing sheet 1002, the No. 1 inner layer cylinder 1001 is installed on the inner wall of the cavity in the fixed end 2, the No. 1 inner ring pressing sheet 1002 is connected to the output end of the No. 1 inner layer cylinder 1001, and the No. 1 inner ring pressing sheet 1002 is embedded in In the No. 1 interlocking groove 11, the surface of the No. 1 inner ring pressing piece 1002 is flush with the bottom wall of the outer mold 3; the No. 2 pressing mechanism includes a No. 2 inner layer cylinder 1005 (1005) and a No. 2 inner ring pressing piece 1006, the No. 2 inner layer cylinder 1005 is installed on the inner wall of the cavity in the moving end 4, the No. 2 inner ring pressing piece 1006 is connected to the output end of the No. 2 inner layer cylinder 1005, the No. 2 inner ring pressing piece 1006 is embedded in the No. 2 interlocking groove 13, and the surface of the No. 2 inner ring pressing piece 1006 is flush with the bottom wall of the inner mold 5; the No. 1 inner layer cylinder 1001 and the No. 2 inner layer cylinder 1005 are respectively used to drive the No. 1 inner ring pressing piece 1002 and the No. 2 inner ring pressing piece 10 06 is pressed against the bottom wall of the plastic trash can. When the plastic trash can is disconnected from one of the outer mold 3 and the inner mold 5 first, the No. 1 pressing mechanism and the No. 2 pressing mechanism are started, and the No. 1 inner layer cylinder 1001 drives the No. 1 inner ring pressing piece 1002, and the No. 2 inner layer cylinder 1005 drives the No. 2 inner ring pressing piece 1006 to press against the two sides of the bottom wall of the plastic trash can respectively to lock the plastic trash can. At this time, the outer mold 3 and the inner mold 5 that are not disconnected from the plastic trash can are rotated. The reason why the No. 1 pressing mechanism and the No. 2 pressing mechanism are not started at the beginning of the rotation of the outer mold 3 and the inner mold 5 is that if the plastic trash can is disconnected from the outer mold 3 and the inner mold 5 The bonding force between them is the same, the plastic trash can and the outer mold 3 and the inner mold 5 will be disconnected at the same time, and there is no need to start the No. 1 pressing mechanism and the No. 2 pressing mechanism. On the one hand, it can save equipment energy consumption, and on the other hand, it can avoid the frequent opening of the No. 1 interlocking groove 11 and the No. 2 interlocking groove 13, which causes residual materials to enter. It is worth noting that the piston rods of the No. 1 inner cylinder 1001 and the No. 2 inner cylinder 1005 are respectively extended from the No. 1 port 12 and the No. 2 port 14, and the No. 1 port 12 and the No. 2 port 14 have sufficient length. When the outer mold 3 and the inner mold 5 rotate, the No. 1 port 12 and the No. 2 port 14 provide sufficient space for the piston rod, and no movement interference will occur.

[0056] See also Figure 4-Figure 8 , Figure 15-Figure 20In this embodiment, a No. 3 pressing mechanism and a No. 4 pressing mechanism are respectively installed on the fixed end 2 and the movable end 4, the No. 3 pressing mechanism is arranged concentrically around the periphery of the No. 1 pressing mechanism, and the No. 4 pressing mechanism is arranged concentrically around the periphery of the No. 2 pressing mechanism, and the No. 3 pressing mechanism and the No. 4 pressing mechanism pass through the No. 1 opening 12 and the No. 2 opening 14 respectively, and the No. 3 pressing mechanism and the No. 4 pressing mechanism are both used to apply pressure to the plastic trash can, and the No. 3 pressing mechanism and the No. 4 pressing mechanism are symmetrically arranged; the No. 3 pressing mechanism includes a No. 1 outer layer cylinder 1003 and a No. 1 outer ring pressing sheet 1004, and the No. 1 outer layer cylinder 1003 is installed on the fixed end 2 On the inner wall of the cavity inside, the No. 1 outer ring pressing piece 1004 is connected to the output end of the No. 1 outer layer cylinder 1003, the No. 1 outer ring pressing piece 1004 is embedded in the No. 1 interlocking groove 11, and the surface of the No. 1 outer ring pressing piece 1004 is flush with the bottom wall of the outer mold 3; the No. 4 pressing mechanism includes the No. 2 outer layer cylinder 1007 and the No. 2 outer ring pressing piece 1008, the No. 2 outer layer cylinder 1007 is installed on the inner wall of the cavity inside the moving end 4, the No. 2 outer ring pressing piece 1008 is connected to the output end of the No. 2 outer layer cylinder 1007, the No. 2 outer ring pressing piece 1008 is embedded in the No. 2 interlocking groove 13, and the surface of the No. 2 outer ring pressing piece 1008 is flush with the bottom wall of the inner mold 5;The No. 1 outer cylinder 1003 and the No. 2 outer cylinder 1007 are respectively used to drive the No. 1 outer ring pressing plate 1004 and the No. 2 outer ring pressing plate 1008 to press and lock on the bottom wall of the plastic trash can. When the plastic trash can is disconnected from one of the outer mold 3 and the inner mold 5 first, the No. 1 pressing mechanism and the No. 2 pressing mechanism are started, and the No. 1 inner ring pressing plate 1002 is driven by the No. 1 inner cylinder 1001, and the No. 2 inner ring pressing plate 1006 is driven by the No. 2 inner cylinder 1005 to press against the bottom wall of the plastic trash can. The two sides of the bottom wall of the trash can are used to lock the plastic trash can. At this time, rotate the outer mold 3 and the inner mold 5 that are not disconnected from the plastic trash can. If the friction locking force of the No. 1 inner ring pressing piece 1002 and the No. 2 inner ring pressing piece 1006 on the plastic trash can is less than the bonding force between the plastic trash can and the outer mold 3 or the inner mold 5, the plastic trash can will still rotate with one of the outer molds 3 or the inner mold 5, and the bonding with one of the outer mold 3 or the inner mold 5 still cannot be completely disconnected. At this time, start the No. 3 pressing mechanism and the No. 4 pressing mechanism again, and drive the No. 1 outer ring pressing piece 1004 and the No. 2 outer ring pressing piece 1007 to drive the No. 2 outer ring pressing piece 1008 to press against the two sides of the bottom wall of the plastic trash can respectively through the No. 1 outer cylinder 1003, and the No. 2 outer cylinder 1007 drives the No. 2 outer ring pressing piece 1008 to press against the two sides of the bottom wall of the plastic trash can, and further lock the plastic trash can by expanding the friction area. At this time, rotate the outer mold 3 and the inner mold 5 that are not disconnected from the plastic trash can. It is worth noting that the piston rods of the No. 1 outer cylinder 1003 and the No. 2 outer cylinder 1007 are respectively Passing through the No. 1 and No. 2 ports 14, the No. 1 and No. 2 ports 14 are of sufficient length. When the outer mold 3 and the inner mold 5 rotate, the No. 1 and No. 2 ports 14 provide sufficient space for the piston rod, and no motion interference occurs. In addition, the reason why the friction locking effect of the plastic trash can is not improved by increasing the driving force of the No. 1 and No. 2 top pressing mechanisms is because the bottom wall of the plastic trash can is relatively thin and is easily deformed and damaged by the extreme extrusion force. ;

[0057] See also Figure 4-Figure 8 , Figure 13-Figure 14 , Figure 17-Figure 18In this embodiment, a No. 1 sealing structure and a No. 2 sealing structure are respectively installed on the fixed end 2 and the movable end 4. The No. 1 sealing structure is used to block the gap between the No. 1 pressing mechanism, the No. 3 pressing mechanism and the No. 1 interlocking groove 11, and the No. 2 sealing structure is used to block the gap between the No. 2 pressing mechanism, the No. 4 pressing mechanism and the No. 2 interlocking groove 13; the No. 1 sealing structure includes a No. 1 micro air pump 1501, a No. 1 back plate 1502 and a No. 1 sealing rubber airbag 1503. The No. 1 micro air pump 1501 is installed in the cavity of the fixed end 2, the No. 1 back plate 1502 is connected to the No. 1 sealing rubber airbag 1503, and both are arranged in the No. 1 interlocking groove 11. , the No. 1 back plate 1502 covers the No. 1 passage 12, the No. 1 micro air pump 1501 inflates the No. 1 sealing rubber airbag 1503 through a hose, and the No. 1 sealing rubber airbag 1503 expands and fills the No. 1 interlocking groove 11; the No. 2 sealing structure includes the No. 2 micro air pump 1504, the No. 2 back plate 1505 and the No. 2 sealing rubber airbag 1506, the No. 2 micro air pump 1504 is installed in the cavity of the mobile terminal 4, the No. 2 back plate 1505 is connected to the No. 2 sealing rubber airbag 1506, and both are arranged in the No. 2 interlocking groove 13, the No. 2 back plate 1505 covers the No. 2 passage 14, the No. 2 micro air pump 1504 inflates the No. 1 sealing rubber airbag 1503 through a hose, and the No. 1 sealing rubber airbag 1503 expands and fills the No. 1 interlocking groove 11; the No. 2 sealing structure includes the No. 2 micro air pump 1504, the No. 2 back plate 1505 and the No. 2 sealing rubber airbag 1506, the No. 2 micro air pump 1504 is installed in the cavity of the mobile terminal 4, the No. 2 back plate 1505 is connected to the No. 2 sealing rubber airbag 1506, and the two are both arranged in the No. 2 interlocking groove 13, the No. 2 back plate 1505 covers the No. 2 passage 14, the No. 2 micro air pump 1504 is inflated through a hose The tube inflates the No. 2 sealing rubber airbag 1506, and the No. 2 sealing rubber airbag 1506 expands and fills the No. 2 interlocking groove 13. There is a structural gap between the No. 1 pressing mechanism, the No. 3 pressing mechanism and the No. 1 interlocking groove 11, and there is also a structural gap between the No. 2 pressing mechanism, the No. 4 pressing mechanism and the No. 2 interlocking groove 13. When injecting plastic raw materials, the fluid plastic raw materials are easy to flow into the gaps. Therefore, before injecting the material, the No. 1 micro air pump 1501 and the No. 2 micro air pump 1504 are started to inflate the No. 1 sealing rubber airbag 1503 and the No. 2 sealing rubber airbag 1506 respectively, so that the two are expanded and the structural gaps are gradually filled. Full to prevent material loss, the injection temperature of PP plastic is generally 160-170℃, the No.1 sealing rubber airbag 1503 and the No.2 sealing rubber airbag 1506 can be made of vulcanized high-temperature resistant rubber material, which can withstand high temperatures above 200℃ without affecting normal use. The No.1 back plate 1502 and the No.2 back plate 1505 are respectively used as the mounting platforms of the No.1 sealing rubber airbag 1503 and the No.2 sealing rubber airbag 1506, which can play the role of closing the No.1 port 12 and the No.2 port 14 to prevent the No.1 sealing rubber airbag 1503 and the No.2 sealing rubber airbag 1506 from expanding and deforming toward the No.1 port 12 and the No.2 port 14.

[0058] See also Figure 4-Figure 6 , Figure 8 , Fig.10 , Fig.12 , Figure 15-16In this embodiment, the forward transmission assembly and the reverse transmission assembly are respectively equipped with a first torque detection mechanism and a second torque detection mechanism for detecting the torque change data of the two. The first torque detection mechanism is electrically connected to the No. 1 pressing mechanism and the No. 2 pressing mechanism, and the second torque detection mechanism is electrically connected to the No. 3 pressing mechanism and the No. 4 pressing mechanism; the first torque detection mechanism includes a No. 1 torque sensor 17 and a No. 1 torsion spring 18, a side shaft 16 is fixedly connected to the No. 1 driving gear 802, the side shaft 16 is movably connected to the output end of the No. 1 motor 803, the No. 1 torsion spring 18 is sleeved on the side shaft 16 and the outer side of the output end of the No. 1 motor 803, and the No. 1 torque sensor 17 is installed on the output end of the No. 1 motor 803. One end of the No. 1 torsion spring 18 is connected to the No. 1 torque sensor 17, and the other end is connected to the No. 1 driving gear 802. The No. 1 torque sensor 17 detects the torque change data of the No. 1 torsion spring 18; the second torque detection mechanism includes a No. 2 torque sensor 20 and a No. 2 torsion spring 21. The No. 2 driving gear 902 is fixedly connected with a middle shaft rod 19, and the middle shaft rod 19 is movably connected to the output end of the No. 2 motor 901. The No. 2 torsion spring 21 is sleeved on the outer side of the middle shaft rod 19 and the output end of the No. 2 motor 901. The No. 2 torque sensor 20 is installed on the output end of the No. 2 motor 901. One end of the No. 2 torsion spring 21 is connected to the No. 2 torque sensor 20, and the other end is connected to the No. 2 driving gear 902. The No. 2 torque sensor 2 0 detects the torque change data of the No. 2 torsion spring 21, the forward transmission component and the reverse transmission component operate simultaneously, the No. 1 motor 803 drives the No. 1 driving gear 802 to rotate, and the No. 2 motor 901 drives the No. 2 driving gear 902 to rotate. Initially, because the No. 1 driving gear 802 is movably connected to the output end of the No. 1 motor 803 through the side shaft 16, and the No. 2 driving gear 902 is movably connected to the output end of the No. 2 motor 901 through the main shaft, the No. 1 driving gear 802 and the No. 2 driving gear 902 will not rotate, but the No. 1 torsion spring 18 and the No. 2 torsion spring 21 will be torsionally deformed to obtain torque. As the deformation of the No. 1 torsion spring 18 and the No. 2 torsion spring 21 reaches the maximum value, the two are respectively Pull the No. 1 driving gear 802 and the No. 2 driving gear 902 to rotate, drive the outer mold 3 and the inner mold 5 to rotate synchronously in the opposite direction, and rotate to disconnect the bonding between the plastic trash can and the outer mold 3 and the inner mold 5. When the bonding between the outer mold 3 and the plastic trash can is disconnected first, the outer mold 3 is no longer subjected to the bonding force, and the No. 1 driving gear 802 is rotated back to the initial state by the elastic deformation reset action of the No. 1 torsion spring 18. At this time, the No. 1 torque sensor 17 detects that the torque signal of the No. 1 torsion spring 18 disappears before the No. 2 torque sensor 20. The system determines that the plastic trash can is disconnected from the outer mold 3 first, and is still in a sticky state with the inner mold 5. At this time, according to the determination result, the plastic trash can is first locked, and then the inner mold 5 is rotated to disconnect;When the bonding between the inner mold 5 and the plastic trash can is disconnected first, the inner mold 5 is no longer subjected to the bonding force, and the second driving gear 902 is rotated back to the initial state by the elastic deformation reset action of the second torsion spring 21. At this time, the second torque sensor 20 detects that the torque signal of the second torsion spring 21 disappears before the first torque sensor 17. The system determines that the plastic trash can is disconnected from the inner mold 5 first, but is still in a sticky state with the outer mold 3. At this time, according to the determination result, the plastic trash can is first locked, and then the outer mold 3 is rotated to disconnect. ;

[0059] A non-stick plastic injection molding process for a plastic trash can, using the non-stick plastic injection molding machine for a plastic trash can as described above, comprises the following steps:

[0060] Step S1: The mobile end 4 moves along the base toward the fixed end 2 until the inner mold 5 and the outer mold 3 are closed, and the barrel 6 also moves along the base toward the fixed end 2 until the injection port enters the outer mold 3, and the No. 1 sealing structure and the No. 2 sealing structure are activated to seal the structural gaps on the outer mold 3 and the inner mold 5. Then, the plastic raw material is injected into the mold cavity formed by the outer mold 3 and the inner mold 5 through the barrel 6, and is cooled, shrunk, solidified, and formed by the built-in cooling system of the injection molding machine (the plastic trash can will shrink to a certain extent after cooling and molding, and most of its surface will be separated from the outer mold 3 and the inner mold 5. However, once the cooling is uneven or the cooling system fails, the plastic trash can will be partially adhered to the outer mold 3 and the inner mold 5. The bonding force is related to the bonding area, the firmness of the bonding, and the degree of solidification of the material);

[0061] Step S2: In the mold closing state, the forward transmission component drives the outer mold 3 to rotate clockwise, and at the same time, the reverse transmission component drives the inner mold 5 to rotate counterclockwise;

[0062] Step S3: When the outer mold 3 and the inner mold 5 rotate in opposite directions at the same time, the first torque detection mechanism and the second torque detection mechanism detect the torque changes of the forward transmission component and the reverse transmission component respectively, and the detection results are divided into the following three cases:

[0063] When the time point of the torque reset signal of the forward transmission component is detected to be the same as the time point of the torque reset signal of the reverse transmission component, it indicates that the bonding forces between the plastic trash can and the outer mold 3 and the inner mold 5 are the same, and the adhesive parts of the formed plastic trash can and the outer mold 3 and the inner mold 5 are simultaneously broken by the rotational tension;

[0064] Or, when the time point of the torque reset signal of the forward transmission component is detected earlier than the time point of the torque reset signal of the reverse transmission component, it means that the bonding force between the plastic trash can and the outer mold 3 is less than the bonding force between the plastic trash can and the inner mold 5, and the plastic trash can rotates with the inner mold 5, and the adhesion between the plastic trash can and the inner mold 5 cannot be broken, while the adhesion between the plastic trash can and the outer mold 3 is broken first. At this time, the first and second pressing mechanisms are started to lock the plastic trash can, and the inner mold 5 is directly rotated to break the adhesion between the plastic trash can and the inner mold 5. At the same time, the second torque detection mechanism detects the torque change of the reverse transmission component, and determines whether the adhesion is broken by whether the torque signal is lost;

[0065] Or, when the time point of the torque reset signal of the forward transmission component is detected later than the time point of the torque reset signal of the reverse transmission component, it means that the bonding force between the plastic trash can and the outer mold 3 is greater than the bonding force between the plastic trash can and the inner mold 5, and the plastic trash can rotates with the outer mold 3, and the adhesion between the plastic trash can and the outer mold 3 cannot be broken, while the adhesion between the plastic trash can and the inner mold 5 is broken first. At this time, the No. 1 pressing mechanism and the No. 2 pressing mechanism are started to lock the plastic trash can, and the outer mold 3 is directly rotated to break the adhesion between the plastic trash can and the outer mold 3. At the same time, the first torque detection mechanism detects the torque change of the forward transmission component, and determines whether the adhesion is broken by whether the torque signal is lost (the No. 1 pressing mechanism and the No. 2 pressing mechanism play the role of clamping the plastic trash can with opposite pressing, keeping the plastic trash can in a static state, and the outer mold 3 and the inner mold 5 rotate in opposite directions to break the adhesion);

[0066] S4: When the first torque detection mechanism and the second torque detection mechanism cannot identify the loss of the torque signal within the preset rotation stroke, it means that the locking force of the No. 1 pressing mechanism and the No. 2 pressing mechanism on the plastic trash can is less than the bonding force between the plastic trash can and the outer mold 3 or the inner mold 5, and the plastic trash can is not completely locked and still rotates synchronously with the outer mold 3 or the inner mold 5. At this time, the No. 3 pressing mechanism and the No. 4 pressing mechanism are started to increase the friction locking area of ​​the plastic trash can. At this time, the outer mold 3 or the inner mold 5 is rotated again to break the sticky part (the No. 3 pressing mechanism and the No. 4 pressing mechanism play a role in further expanding the clamping area of ​​the plastic trash can. By increasing the friction surface, the friction locking force is increased. Compared with increasing the extrusion locking force, it is less likely to cause damage to the plastic trash can);

[0067] S5: When the plastic trash can is completely separated from the outer mold 3 or the inner mold 5, the movable end 4 moves along the base again and disengages from the fixed end 2 until the inner mold 5 is separated from the outer mold 3 and the plastic trash can is removed from the inner mold 5.

[0068] Through the above steps, the local adhesion between the plastic trash can and the outer mold 3 and the inner mold 5 is broken by the forward and reverse rotation of the outer mold 3 and the inner mold 5, instead of the traditional pull-out mold opening to break the adhesion. The forces in different tangential directions generated by the rotation are better than the linear forces in a fixed direction generated by the pull-out method. The breaking effect of the bonding part is good, which can effectively avoid the adhesion of the plastic trash can from being stretched and deformed, and prevent the trash can wall from being damaged due to local adhesion and tension, thereby ensuring the molding quality of the plastic trash can, so as to solve the problem that the plastic trash can is locally adhered to the mold due to uneven cooling and shrinkage during the injection molding process. If the traditional pull-out mold opening method is used, the adhesion of the trash can wall may be torn and the trash can may be damaged.

Claims

1. A non-stick plastic injection molding machine for a plastic trash can, comprising a base (1) and a barrel (6), characterized in that: The machine also comprises a fixed end (2), an outer mold (3) movably mounted in the fixed end (2), a movable end (4) and an inner mold (5) movably mounted on the movable end (4); the fixed end (2), the movable end (4) and a barrel (6) are all mounted on a machine base (1); the movable end (4) is used to move along the machine base (1) and drive the inner mold (5) and the outer mold (3) to close the mold; the barrel (6) is used to move along the machine base (1) to the fixed end (2) and inject plastic between the outer mold (3) and the inner mold (5); a driving chamber (7) is mounted on one side of the fixed end (2); a forward transmission component for driving the outer mold (3) to rotate is arranged between the driving chamber (7) and the outer mold (3); a reverse transmission component for driving the inner mold (5) to rotate is arranged between the movable end (4) and the inner mold (5); the rotation direction of the outer mold (3) is opposite to the rotation direction of the inner mold (5); The forward transmission assembly comprises an outer gear ring (801), a first driving gear (802) and a first motor (803), wherein the outer gear ring (801) is fixedly connected to the outer wall of the outer mold (3), the first driving gear (802) is arranged in the driving chamber (7) and meshedly connected with the outer gear ring (801), the first motor (803) is installed on the driving chamber (7), and the first driving gear (802) is connected to the output end of the first motor (803); The reverse transmission assembly comprises a second motor (901), a second driving gear (902) and an inner gear ring (903), wherein the second motor (901) is installed in a cavity in the moving end (4), the second driving gear (902) is connected to the output end of the second motor (901), the inner gear ring (903) is arranged in the middle of the inner mold (5), and the second driving gear (902) is meshedly connected with the inner gear ring (903).

2. The anti-sticking plastic injection molding machine for a plastic trash can according to claim 1, characterized in that: A No. 1 engaging groove (11) with an annular structure is provided on the bottom wall of the outer mold (3), and a No. 1 through-hole (12) communicating with the cavity in the fixed end (2) is provided on the inner wall of the No. 1 engaging groove (11) with an annular structure is provided on the bottom wall of the inner mold (5), and a No. 2 through-hole (14) communicating with the cavity in the movable end (4) is provided on the inner wall of the No. 2 engaging groove (13) with an annular structure.

3. The anti-sticking plastic injection molding machine for a plastic trash can according to claim 2, characterized in that: A No. 1 pressing mechanism and a No. 2 pressing mechanism are respectively installed on the fixed end (2) and the movable end (4). The No. 1 pressing mechanism and the No. 2 pressing mechanism pass through the No. 1 opening (12) and the No. 2 opening (14) respectively. The No. 1 pressing mechanism and the No. 2 pressing mechanism are both used to apply pressure to the plastic trash can, and the No. 1 pressing mechanism and the No. 2 pressing mechanism are symmetrically arranged.

4. The anti-sticking plastic injection molding machine for a plastic trash can according to claim 3, characterized in that: The No. 1 pressing mechanism comprises a No. 1 inner cylinder (1001) and a No. 1 inner ring pressing piece (1002), wherein the No. 1 inner cylinder (1001) is mounted on the inner wall of the cavity in the fixed end (2), the No. 1 inner ring pressing piece (1002) is connected to the output end of the No. 1 inner cylinder (1001), the No. 1 inner ring pressing piece (1002) is embedded in the No. 1 fitting groove (11), and the surface of the No. 1 inner ring pressing piece (1002) is flush with the bottom wall of the outer mold (3); The second pressing mechanism comprises a second inner cylinder (1005) and a second inner ring pressing piece (1006), wherein the second inner cylinder (1005) is mounted on the inner wall of the cavity in the movable end (4), the second inner ring pressing piece (1006) is connected to the output end of the second inner cylinder (1005), the second inner ring pressing piece (1006) is embedded in the second fitting groove (13), and the surface of the second inner ring pressing piece (1006) is flush with the bottom wall of the inner mold (5); The first inner layer cylinder (1001) and the second inner layer cylinder (1005) are respectively used to drive the first inner ring pressing piece (1002) and the second inner ring pressing piece (1006) to press and lock on the bottom wall of the plastic trash can.

5. The anti-sticking plastic injection molding machine for a plastic trash can according to claim 4, characterized in that: A No. 3 pressing mechanism and a No. 4 pressing mechanism are respectively installed on the fixed end (2) and the movable end (4). The No. 3 pressing mechanism is arranged concentrically around the periphery of the No. 1 pressing mechanism, and the No. 4 pressing mechanism is arranged concentrically around the periphery of the No. 2 pressing mechanism. The No. 3 pressing mechanism and the No. 4 pressing mechanism pass through the No. 1 opening (12) and the No. 2 opening (14) respectively. The No. 3 pressing mechanism and the No. 4 pressing mechanism are both used to apply pressure to the plastic trash can, and the No. 3 pressing mechanism and the No. 4 pressing mechanism are symmetrically arranged.

6. The anti-sticking plastic injection molding machine for a plastic trash can according to claim 5, characterized in that: The third pressing mechanism comprises a first outer cylinder (1003) and a first outer ring pressing piece (1004). The first outer cylinder (1003) is mounted on the inner wall of the cavity in the fixed end (2). The first outer ring pressing piece (1004) is connected to the output end of the first outer cylinder (1003). The first outer ring pressing piece (1004) is embedded in the first fitting groove (11). The surface of the first outer ring pressing piece (1004) is flush with the bottom wall of the outer mold (3). The fourth pressing mechanism comprises a second outer cylinder (1007) and a second outer ring pressing piece (1008), wherein the second outer cylinder (1007) is mounted on the inner wall of the cavity in the movable end (4), the second outer ring pressing piece (1008) is connected to the output end of the second outer cylinder (1007), the second outer ring pressing piece (1008) is embedded in the second fitting groove (13), and the surface of the second outer ring pressing piece (1008) is flush with the bottom wall of the inner mold (5); The first outer layer cylinder (1003) and the second outer layer cylinder (1007) are respectively used to drive the first outer ring pressing piece (1004) and the second outer ring pressing piece (1008) to press and lock on the bottom wall of the plastic trash can.

7. The anti-sticking plastic injection molding machine for a plastic trash can according to claim 5, characterized in that: A No. 1 sealing structure and a No. 2 sealing structure are respectively installed on the fixed end (2) and the movable end (4); the No. 1 sealing structure is used to seal the gap between the No. 1 pressing mechanism, the No. 3 pressing mechanism and the No. 1 engaging groove (11); and the No. 2 sealing structure is used to seal the gap between the No. 2 pressing mechanism, the No. 4 pressing mechanism and the No. 2 engaging groove (13).

8. The anti-sticking plastic injection molding machine for a plastic trash can according to claim 7, characterized in that: The No. 1 sealing structure comprises a No. 1 micro air pump (1501), a No. 1 back plate (1502) and a No. 1 sealing rubber airbag (1503), wherein the No. 1 micro air pump (1501) is installed in the cavity of the fixed end (2), the No. 1 back plate (1502) is connected to the No. 1 sealing rubber airbag (1503), and both are arranged in the No. 1 fitting groove (11), the No. 1 back plate (1502) covers the No. 1 opening (12), the No. 1 micro air pump (1501) inflates the No. 1 sealing rubber airbag (1503) through a hose, and the No. 1 sealing rubber airbag (1503) expands and fills the No. 1 fitting groove (11); The No. 2 sealing structure comprises a No. 2 micro air pump (1504), a No. 2 back plate (1505) and a No. 2 sealing rubber airbag (1506). The No. 2 micro air pump (1504) is installed in the cavity of the mobile end (4). The No. 2 back plate (1505) is connected to the No. 2 sealing rubber airbag (1506), and both are arranged in the No. 2 interlocking groove (13). The No. 2 back plate (1505) covers the No. 2 opening (14). The No. 2 micro air pump (1504) inflates the No. 2 sealing rubber airbag (1506) through a hose, and the No. 2 sealing rubber airbag (1506) expands and fills the No. 2 interlocking groove (13).

9. The anti-sticking plastic injection molding machine for a plastic trash can according to claim 8, characterized in that: The forward transmission assembly and the reverse transmission assembly are respectively provided with a first torque detection mechanism and a second torque detection mechanism for detecting torque change data of the two, the first torque detection mechanism is electrically connected to the first pressing mechanism and the second pressing mechanism, and the second torque detection mechanism is electrically connected to the third pressing mechanism and the fourth pressing mechanism; The first torque detection mechanism comprises a first torque sensor (17) and a first torsion spring (18); a side shaft (16) is fixedly connected to the first driving gear (802); the side shaft (16) is movably connected to the output end of the first motor (803); the first torsion spring (18) is sleeved on the outside of the side shaft (16) and the output end of the first motor (803); the first torque sensor (17) is installed on the output end of the first motor (803); one end of the first torsion spring (18) is connected to the first torque sensor (17) and the other end is connected to the first driving gear (802); the first torque sensor (17) detects torque change data of the first torsion spring (18); The second torque detection mechanism comprises a second torque sensor (20) and a second torsion spring (21); a middle shaft rod (19) is fixedly connected to the second driving gear (902); the middle shaft rod (19) is movably connected to the output end of the second motor (901); the second torsion spring (21) is sleeved on the outer sides of the middle shaft rod (19) and the output end of the second motor (901); the second torque sensor (20) is installed on the output end of the second motor (901); one end of the second torsion spring (21) is connected to the second torque sensor (20) and the other end is connected to the second driving gear (902); the second torque sensor (20) detects torque change data of the second torsion spring (21).

10. A non-stick plastic injection molding process for plastic trash cans, characterized by: The anti-sticking plastic injection molding machine for a plastic trash can as claimed in claim 9 comprises the following steps: Step S1: The mobile end (4) moves along the base toward the fixed end (2) until the inner mold (5) and the outer mold (3) are closed together, and the barrel (6) also moves along the base toward the fixed end (2) until the injection port enters the outer mold (3), and the No. 1 sealing structure and the No. 2 sealing structure are activated to seal the structural gap between the outer mold (3) and the inner mold (5), and then the plastic raw material is injected into the mold cavity formed by the outer mold (3) and the inner mold (5) through the barrel (6), and is cooled, shrunk, solidified, and molded by the built-in cooling system of the injection molding machine; Step S2: In the mold closing state, the forward transmission component drives the outer mold (3) to rotate clockwise, and at the same time, the reverse transmission component drives the inner mold (5) to rotate counterclockwise; Step S3: When the outer mold (3) and the inner mold (5) rotate in opposite directions at the same time, the first torque detection mechanism and the second torque detection mechanism detect the torque changes of the forward transmission component and the reverse transmission component respectively, and the detection results are divided into the following three situations: When the time point at which the torque reset signal of the forward transmission component is detected is the same as the time point at which the torque reset signal of the reverse transmission component is detected, it indicates that the bonding forces between the plastic trash can and the outer mold (3) and the inner mold (5) are the same, and the adhesive portions between the molded plastic trash can and the outer mold (3) and the inner mold (5) are simultaneously broken by the rotational pulling force; Or, when the time point of the torque reset signal of the forward transmission component is detected earlier than the time point of the torque reset signal of the reverse transmission component, it means that the bonding force between the plastic trash can and the outer mold (3) is smaller than the bonding force between the plastic trash can and the inner mold (5), and the plastic trash can rotates with the inner mold (5), and the adhesion between the plastic trash can and the inner mold (5) cannot be broken, while the adhesion between the plastic trash can and the outer mold (3) is broken first. At this time, the first pressing mechanism and the second pressing mechanism are started to lock the plastic trash can, and the inner mold (5) is directly rotated to break the adhesion between the plastic trash can and the inner mold (5). At the same time, the second torque detection mechanism detects the torque change of the reverse transmission component, and determines whether the adhesion is broken by whether the torque signal is lost; Or, when the time point at which the torque reset signal of the forward transmission component is detected is later than the time point at which the torque reset signal of the reverse transmission component is detected, it indicates that the bonding force between the plastic trash can and the outer mold (3) is greater than the bonding force between the plastic trash can and the inner mold (5), and the plastic trash can rotates with the outer mold (3), and the adhesion between the plastic trash can and the outer mold (3) cannot be broken, while the adhesion between the plastic trash can and the inner mold (5) is broken first. At this time, the first pressing mechanism and the second pressing mechanism are started to lock the plastic trash can, and the outer mold (3) is directly rotated to break the adhesion between the plastic trash can and the outer mold (3). At the same time, the first torque detection mechanism detects the torque change of the forward transmission component, and determines whether the adhesion is broken by whether the torque signal is lost; S4: When the first torque detection mechanism and the second torque detection mechanism cannot detect the loss of the torque signal within the preset rotation stroke, it means that the locking force of the No. 1 pressing mechanism and the No. 2 pressing mechanism on the plastic trash can is smaller than the bonding force between the plastic trash can and the outer mold (3) or the inner mold (5), and the plastic trash can is not completely locked and still rotates synchronously with the outer mold or the inner mold. At this time, the No. 3 pressing mechanism and the No. 4 pressing mechanism are started to increase the friction locking area of ​​the plastic trash can. At this time, the outer mold (3) or the inner mold (5) is rotated again to break the sticky part; S5: After the plastic trash can is completely separated from the outer mold (3) or the inner mold (5), the movable end (4) moves along the base again and disengages from the fixed end (2) until the inner mold (5) is separated from the outer mold (3), and the plastic trash can is removed from the inner mold (5).

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