A plastic injection molding machine

Abstract

The present invention relates to the technical field of plastic injection molding, and specifically relates to a plastic injection molding machine, including an injection molding machine. Through an energy-saving base anti-cracking mechanism, when the mold mounting base A with an injection mold mounted on its outer surface and the mold mounting base B are mutually attached, they can be automatically fixed to each other. And when the injection molding is completed and cooling is carried out, through a non-injection rod type injection mechanism, the injection port A can be automatically sealed, thereby preventing a plastic rod from appearing on the finished product. Through the above technical solution, while reducing the production steps, it is no longer necessary to continuously start the hydraulic cylinder during the injection molding process; it solves the problem that when using a plastic injection molding machine, in order to prevent the mutually attached molds from separating due to internal force, it is necessary to continuously start the hydraulic cylinder, and when the hot melt plastic located inside the mold cavity is cooled, the hot melt plastic connected to it inside the injection port will be cooled together, thereby forming a plastic rod on the outer surface of the finished product.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic injection molding, and particularly to a plastic injection molding machine. Background Art

[0002] A plastic injection molding machine, also known as an injection molding machine or a plastic injection machine, is a main molding device that uses a plastic molding die to make various shaped plastic products such as disposable plastic forks, plastic furniture, and plastic casings of various objects from thermoplastic or thermosetting materials.

[0003] The working principle of a plastic injection molding machine is similar to that of a syringe used for injection. It is a process in which the plastic that has been plasticized and is in a molten state (i.e., viscous flow state) is injected into a closed mold cavity by the thrust of a screw (or plunger), and after curing and shaping, the product is obtained. Injection molding is a cyclic process, and each cycle mainly includes: quantitative feeding, melting and plasticizing, pressure injection, filling and cooling, opening the mold to take the part, and after taking out the plastic part, closing the mold again to perform the next cycle.

[0004] However, when using this device, in order to ensure that two mutually fitting molds do not separate due to the pressure inside the mold cavity, resulting in the leakage of hot-melt plastic, it is necessary to continuously start the hydraulic cylinder used to push the mold to move and continuously provide pressure to prevent leakage. In this state, the hydraulic cylinder in continuous operation will consume more energy and cause a certain load on the hydraulic system, thus affecting its service life. Also, when cooling the hot-melt plastic inside the mold cavity, the hot-melt plastic connected to it inside the injection port will be cooled together, resulting in a plastic rod being formed on the outer surface of the finished product, which requires manual removal later. The operation is rather cumbersome. Therefore, it does not meet the existing requirements, and for this reason, we propose a plastic injection molding machine. Summary of the Invention

[0005] The purpose of the present invention is to provide a plastic injection molding machine to solve the problems raised in the above background art, such as when using this device, in order to ensure that two mutually fitting molds do not separate due to the pressure inside the mold cavity, resulting in the leakage of hot-melt plastic, it is necessary to continuously start the hydraulic cylinder used to push the mold to move and continuously provide pressure to prevent leakage. In this state, the hydraulic cylinder in continuous operation will consume more energy and cause a certain load on the hydraulic system, thus affecting its service life. Also, when cooling the hot-melt plastic inside the mold cavity, the hot-melt plastic connected to it inside the injection port will be cooled together, resulting in a plastic rod being formed on the outer surface of the finished product, which requires manual removal later. The operation is rather cumbersome.

[0006] To achieve the above object, the present invention provides the following technical solution: a plastic injection molding machine, including an injection molding machine, on one side inside the injection molding machine, a pushing main cylinder is fixedly installed. At four end corners of the front end face of the pushing main cylinder, a piston rod is connected respectively. Outside the top ends of the four piston rods, there is a mold mounting base A. In front of the mold mounting base A, there is a mold mounting base B. On the face of the mold mounting base A facing the mold mounting base B and the face of the mold mounting base B facing the mold mounting base A, an injection mold is installed respectively. Between the two injection molds, there is a mold cavity. Behind the mold cavity, there is a non-injection-rod type injection mechanism. The non-injection-rod type injection mechanism includes an injection port A, an injection port B, a sealing rod, and a threaded connection type sealing and pushing mechanism. The injection port A is located at the middle position of the rear end face of the injection mold and is communicated with the inside of the mold cavity. The injection port B is located inside the mold mounting base A and corresponds to the position of the injection port A. The total length of the inner walls of the injection port A and the injection port B is the same as the length of the sealing rod, and the inner wall diameters of the injection port A and the injection port B are the same as the outer surface diameter of the sealing rod. Through the threaded connection type sealing and pushing mechanism, the sealing rod can move forward and backward while rotating;

[0007] At four end corners inside the mold mounting base A, an energy-saving base anti-cracking mechanism respectively fixed to the top ends of the four piston rods is provided. The energy-saving base anti-cracking mechanism includes two elastic connection mechanisms, two L-shaped fixing rods, two pushing blocks, two inclined surfaces A, two strip-shaped storage grooves, a limiting groove, and an annular fixing groove. The two strip-shaped storage grooves are respectively located on the upper and lower inner walls of the limiting groove. The annular fixing groove is located behind the two limiting grooves and is simultaneously communicated with the inside of the two limiting grooves;

[0008] The front end of the L-shaped fixing rod is connected to the mold mounting base B through an elastic connection mechanism. The rear end of the L-shaped fixing rod is clamped into the inside of the annular fixing groove, and the width of the rear end of the L-shaped fixing rod is greater than the width of the inner wall of the strip-shaped storage groove;

[0009] The two pushing blocks are respectively fixed to the upper and lower surfaces of the top end of the piston rod, and the surface of the pushing block facing the rear end of the L-shaped fixing rod is an inclined surface A.

[0010] Preferably, the elastic connection mechanism includes a strip-shaped groove. Inside the strip-shaped groove, a metal rod is fixedly provided. A spring is sleeved on the outer surface of the metal rod.

[0011] Preferably, the top end of the L-shaped fixing rod is movably sleeved on the outer surface of the metal rod, and the surface of the spring facing the L-shaped fixing rod is connected to the L-shaped fixing rod.

[0012] Preferably, the energy-saving base anti-cracking mechanism further includes two slots located at the front end face of the mold mounting base A. Both of the two slots communicate with the inside of the annular fixing groove, and the rear end face of the L-shaped fixing rod located inside the annular fixing groove is an inclined surface B.

[0013] Preferably, the injection molding mechanism without an injection rod further includes an injection pipe. The outside of the top end of the injection pipe is provided with a solution plastic transfer groove located at the middle position of the rear end face of the mold mounting base A, and the middle position of the inner wall of the front end of the injection pipe is provided with an internal thread transfer port communicating with the inside of the injection port B.

[0014] Preferably, the threaded connection type sealing and pushing mechanism includes a stepper motor. The output shaft of the stepper motor is connected with a transmission rotating shaft through a coupling. Below the transmission rotating shaft, there is a cylindrical metal shell located inside the solution plastic transfer groove. At the middle positions of the upper and lower end faces of the cylindrical metal shell, a support plate is fixedly provided respectively. The other end of the support plate is fixed to the inner wall of the solution plastic transfer groove, and the stepper motor is located above the solution plastic transfer groove.

[0015] Preferably, a square rotating shaft is provided inside the cylindrical metal shell. The rear end of the square rotating shaft is connected in series with the transmission rotating shaft through a synchronous chain.

[0016] Preferably, a cylindrical groove is provided on the outside of the square rotating shaft inside the cylindrical metal shell. One side inside the cylindrical groove is provided with a limiting ring that fits with its inner wall. The front end face of the limiting ring is fixedly provided with a sealing threaded rod. The outside of the top end of the sealing threaded rod is provided with an internal thread transmission groove located at the middle position of the front end face of the cylindrical metal shell. The internal threads of the internal thread transmission groove and the internal thread transfer port are both matched with the external thread of the sealing threaded rod, and the sealing rod is fixed at the middle position of the front end face of the sealing threaded rod.

[0017] Preferably, a middle position of the rear end face of the limiting ring penetrates through the limiting ring and the sealing threaded rod and extends to the inside of the sealing rod. The square rotating shaft is inserted into the inside of the square transmission rotating shaft;

[0018] The cross-sectional shape of the square rotating shaft is square. The inner wall of the square transmission rotating shaft fits with the outer surface of the square rotating shaft, and the square rotating shaft is slidably connected with the square transmission rotating shaft.

[0019] Preferably, a metal cover plate is provided behind the stepper motor at the rear end face of the mold mounting base A, and the mold mounting base A and the metal cover plate are fixed by screws.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. Through the energy-saving base anti-cracking mechanism of the present invention, when the mold mounting base A with an injection mold installed on its outer surface and the mold mounting base B are in mutual contact, they can be automatically fixed to prevent the two injection molds from separating due to pressure during the subsequent injection process. During the subsequent injection and cooling processes, the pushing main cylinder can be closed to let it rest. When it is necessary to separate the mold mounting base A and the mold mounting base B to take out the injection molded product, the piston rod can be pulled backward by the pushing main cylinder to first release the fixation between the two, and then the mold mounting base A can be pulled backward. Through the above technical solution, after the two injection molds are closely attached, the pushing main cylinder can stop working, so that it no longer needs to continuously maintain the thrust, which reduces the operating time of the hydraulic system, thereby reducing energy consumption and can reduce the operating time of the pushing main cylinder to reduce the load of the system, which helps to extend the service life of the system and reduce the failure rate;

[0022] 2. Through the present invention, when the injection is completed and cooling is carried out, through the injection mechanism without an injection rod, the sealing rod can be automatically moved forward to seal the injection port A for injection, so as to prevent unnecessary plastic rods from appearing on the finished product. Through the above technical solution, unnecessary plastic rods will not appear on the finished product produced by the injection molding machine, so that subsequent manual cutting of the plastic rods is no longer required, reducing its production steps. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of the whole of the present invention;

[0024] Figure 2 is a front view of the internal structure of the whole of the present invention;

[0025] Figure 3 is of the present invention Figure 2 an enlarged structural view of part A in;

[0026] Figure 4 is of the present invention Figure 3 an enlarged structural view of part B in;

[0027] Figure 5 is of the present invention Figure 3 an enlarged structural view of part C in;

[0028] Figure 6 is of the present invention Figure 5 an enlarged structural view of part D in.

[0029] In the figure: 1, injection molding machine; 2, injection molding mechanism without injection rod; 201, injection tube; 202, solution plastic transfer tank; 203, internal thread transfer port; 204, injection port A; 205, injection port B; 206, cylindrical metal shell; 207, stepping motor; 208, transmission rotating shaft; 209, synchronous chain; 210, square rotating shaft; 211, cylindrical groove; 212, limit ring; 213, sealing screw rod; 214, internal thread drive groove; 215, sealing rod; 216, square drive rotating shaft; 217, support plate; 3, main pushing cylinder; 4, piston rod; 5, mold installation base A; 6, injection mold; 7, mold installation base B; 8, mold cavity; 9, limit groove; 10, pushing block; 11, inclined surface A; 12, annular fixing groove; 13, slot; 14, L-shaped fixing rod; 15, inclined surface B; 16, strip groove; 17, metal rod; 18, spring; 19, strip storage groove. Detailed implementation mode

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0031] Please refer to Figures 1 to 6 , an embodiment provided by the present invention: a plastic injection molding machine, including an injection molding machine 1. On one side inside the injection molding machine 1, a main pushing cylinder 3 is fixedly installed. Four end corners on the front end face of the main pushing cylinder 3 are each connected to a piston rod 4. Outside the top ends of the four piston rods 4, there is a mold installation base A 5. In front of the mold installation base A 5, there is a mold installation base B 7. On the surface of the mold installation base A 5 facing the mold installation base B 7 and the surface of the mold installation base B 7 facing the mold installation base A 5, an injection mold 6 is installed. Between the two injection molds 6, there is a mold cavity 8. Behind the mold cavity 8, there is an injection molding mechanism without injection rod 2. The injection molding mechanism without injection rod 2 includes an injection port A 204, an injection port B 205, a sealing rod 215, and a threaded sealing and pushing mechanism. The injection port A 204 is located in the middle of the rear end face of the injection mold 6 and is communicated with the inside of the mold cavity 8. The injection port B 205 is located inside the mold installation base A 5 and corresponds to the position of the injection port A 204. The total length of the inner walls of the injection port A 204 and the injection port B 205 is the same as the length of the sealing rod 215, and the inner wall diameters of the injection port A 204 and the injection port B 205 are the same as the outer surface diameter of the sealing rod 215. Through the threaded sealing and pushing mechanism, the sealing rod 215 can rotate and move back and forth.

[0032] At the four end corners inside the mold installation base A5, there is an energy-saving base anti-cracking mechanism respectively fixed to the top ends of the four piston rods 4. The energy-saving base anti-cracking mechanism includes two elastic connection mechanisms, two L-shaped fixing rods 14, two pushing blocks 10, two inclined surfaces A11, two strip-shaped storage grooves 19, a limiting groove 9 and an annular fixing groove 12. The two strip-shaped storage grooves 19 are respectively located on the upper and lower inner walls of the limiting groove 9. The annular fixing groove 12 is located behind the two limiting grooves 9 and is internally communicated with the two limiting grooves 9 at the same time;

[0033] The front end of the L-shaped fixing rod 14 is connected to the mold installation base B7 through an elastic connection mechanism. The rear end of the L-shaped fixing rod 14 is clamped into the inside of the annular fixing groove 12, and the width of the rear end of the L-shaped fixing rod 14 is greater than the width of the inner wall of the strip-shaped storage groove 19;

[0034] The two pushing blocks 10 are respectively fixed to the upper and lower surfaces of the top end of the piston rod 4, and the surface of the pushing block 10 facing the rear end of the L-shaped fixing rod 14 is the inclined surface A11.

[0035] Please continue to refer to Figures 1 to 6 As shown in the figure, the elastic connection mechanism provided by the present invention includes a strip-shaped groove 16. A metal rod 17 is fixedly arranged inside the strip-shaped groove 16. A spring 18 is sleeved on the outer surface of the metal rod 17. The top end of the L-shaped fixing rod 14 is movably sleeved on the outer surface of the metal rod 17. The surface of the spring 18 facing the L-shaped fixing rod 14 is connected to the L-shaped fixing rod 14. When the equipment needs to be used, injection molds 6 are installed on the opposite surfaces of the mold installation base A5 and the mold installation base B7 respectively, and then the power supply is connected. The mold installation base A5 is pushed forward by the pushing main cylinder 3.

[0036] The energy-saving base anti-cracking mechanism further includes two slot grooves 13. The two slot grooves 13 are located on the front end face of the mold installation base A5. The two slot grooves 13 are both internally communicated with the inside of the annular fixing groove 12. The rear end face of the L-shaped fixing rod 14 located inside the annular fixing groove 12 is an inclined surface B15. As the mold installation base A5 moves, the inclined surface B15 located on the rear end face of the L-shaped fixing rod 14 will contact the slot groove 13 and push the L-shaped fixing rod 14 outwards. When the L-shaped fixing rod 14 moves outwards, it will squeeze the spring 18 connected to it. When the mold installation base A5 and the mold installation base B7 are combined, the two injection molds 6 respectively installed on the outer surfaces of the mold installation base A5 and the mold installation base B7 will also fit together accordingly, and a mold cavity 8 will be generated between the two;

[0037] When the mold mounting base A5 and the mold mounting base B7 are closed with each other, the top end of the L-shaped fixing rod 14 will also move to the position of the annular fixing groove 12 accordingly. Through the reaction force of the compressed spring 18, the L-shaped fixing rod 14 can be pushed inward, so as to snap the rear end of the L-shaped fixing rod 14 into the annular fixing groove 12 inside the mold mounting base A5. And since the width of the rear end of the L-shaped fixing rod 14 is greater than the width of the inner wall of the strip-shaped storage groove 19, there is no need to worry that the rear end of the L-shaped fixing rod 14 will enter the strip-shaped storage groove 19 communicating with the annular fixing groove 12.

[0038] After the L-shaped fixing rod 14 is snapped into the annular fixing groove 12, the mold mounting base A5 and the mold mounting base B7 will be fixed to each other accordingly. After the two are fixed, the pushing main cylinder 3 can be closed to make it rest. When it is necessary to separate the mold mounting base A5 and the mold mounting base B7 and take out the injection molded product, the piston rod 4 is pulled backward through the pushing main cylinder 3. When the piston rod 4 moves backward, the pushing block 10 fixed on the outer surface of the piston rod 4 will move backward together. As the pushing block 10 moves, the inclined surface A11 on the rear end face of the pushing block 10 will contact the L-shaped fixing rod 14 stuck inside the annular fixing groove 12 and push the L-shaped fixing rod 14 outward, so that it completely leaves the annular fixing groove 12 to release the fixation between the mold mounting base A5 and the mold mounting base B7. After the fixation between the two is released, as the piston rod 4 moves, the pushing block 10 will enter the annular fixing groove 12. When the inclined surface A11 on the rear end face of the pushing block 10 contacts the inner wall of the annular fixing groove 12, the mold mounting base A5 will be pulled backward as the piston rod 4 moves, so as to separate the mold mounting base A5 and the mold mounting base B7. Through the above technical solution, when the two injection molds 6 are closely attached, the pushing main cylinder 3 can stop working, so that it no longer needs to continuously maintain the thrust. This reduces the running time of the hydraulic system, thereby reducing energy consumption and can reduce the running time of the pushing main cylinder 3 to reduce the system load, which helps to extend the service life of the system and reduce the failure rate.

[0039] The rodless injection mechanism 2 provided by the present invention further includes an injection pipe 201. The outer side of the top end of the injection pipe 201 is provided with a solution plastic transmission groove 202 at the middle position of the rear end face of the mold mounting base A5, and the middle position of the inner wall of the front end of the injection pipe 201 is provided with an internal thread transmission port 203 communicating with the inside of the injection port B205. When the two injection molds 6 are closed with each other and injection molding operation is required, hot melt plastic is poured into the solution plastic transmission groove 202 through the injection pipe 201. This hot melt plastic will enter the internal thread transmission port 203 along the solution plastic transmission groove 202, and finally enter the mold cavity 8 along the internal thread transmission port 203, the injection port B205 and the injection port A204.

[0040] The threaded connection type sealing and pushing mechanism includes a stepping motor 207. The output shaft of the stepping motor 207 is connected with a transmission rotating shaft 208 through a coupling. Below the transmission rotating shaft 208, there is a cylindrical metal shell 206 located inside the solution plastic transmission tank 202. At the middle positions of the upper and lower end faces of the cylindrical metal shell 206, a support plate 217 is fixedly provided respectively, and the other end of the support plate 217 is fixed to the inner wall of the solution plastic transmission tank 202; after the hot melt plastic perfusion is completed and the cooling operation starts, the stepping motor 207 is started, and the transmission rotating shaft 208 connected thereto can be driven to rotate by the stepping motor 207.

[0041] Inside the cylindrical metal shell 206, there is a square rotating shaft 210. The rear end of the square rotating shaft 210 is connected in series with the transmission rotating shaft 208 through a synchronous chain 209; when the transmission rotating shaft 208 rotates, the square rotating shaft 210 connected in series with it through the synchronous chain 209 will rotate accordingly.

[0042] Further, outside the square rotating shaft 210, there is a cylindrical groove 211 located inside the cylindrical metal shell 206. On one side inside the cylindrical groove 211, there is a limiting ring 212 that fits the inner wall thereof. On the front end face of the limiting ring 212, a sealing threaded rod 213 is fixedly provided. Outside the top end of the sealing threaded rod 213, there is an internal thread transmission groove 214 located at the middle position of the front end face of the cylindrical metal shell 206. The internal threads of the internal thread transmission groove 214 and the internal thread transmission port 203 are both matched with the external thread of the sealing threaded rod 213, and a sealing rod 215 is fixed at the middle position of the front end face of the sealing threaded rod 213; at the middle position of the rear end face of the limiting ring 212, there is a through hole passing through the limiting ring 212 and the sealing threaded rod 213 and extending into the inside of the sealing rod 215, and the square rotating shaft 210 is inserted into the inside of the square transmission rotating shaft 216.

[0043] The cross-sectional shape of the square rotating shaft 210 is square. The inner wall of the square transmission rotating shaft 216 fits the outer surface of the square rotating shaft 210, and the square rotating shaft 210 is slidably connected with the square transmission rotating shaft 216; since the outer surface of the square rotating shaft 210 fits the inner wall of the cylindrical metal shell 206, when the square rotating shaft 210 rotates, the sealing threaded rod 213 will be driven to rotate together. Through the internal thread transmission of the internal thread transmission groove 214, the rotating sealing threaded rod 213 will move back and forth. At this time, when the sealing threaded rod 213 moves forward, the sealing rod 215 fixed on the front end face of the sealing threaded rod 213 will enter the inside of the injection port B205 and pass through the injection port B205 into the inside of the injection port A204 accordingly.

[0044] In actual application, as the sealing threaded rod 213 rotates and moves, the top end of the sealing threaded rod 213 will also enter the interior of the internal thread transmission port 203 and be connected with its thread. When the sealing threaded rod 213 itself can no longer move forward, the sealing rod 215 will also complete the sealing of the injection port A204. By sealing the injection port A204 used for injection molding, unnecessary plastic rods can be prevented from appearing on the finished product. Through the above technical solution, unnecessary plastic rods will not appear on the finished product produced by the injection molding machine 1, so that it is no longer necessary to manually cut off the plastic rods in the future, thereby reducing its production steps.

[0045] Furthermore, the threaded connection structure between the sealing threaded rod 213 and the internal thread transmission port 203 can prevent the sealing rod 215 from moving without authorization, thereby causing the injection port B205 to fail to be completely sealed.

[0046] When the cooling process is completed, when the mold mounting base A5 is moved backward to take out the finished product, the sealing rod 215 is moved inward by the stepping motor 207 to release the seal of the injection port A204.

[0047] And the stepper motor 207 is located above the solution plastic transmission tank 202; installing the stepper motor 207 above the solution plastic transmission tank 202 can prevent it from coming into close contact with the molten plastic inside the solution plastic transmission tank 202, thereby causing its temperature to be too high.

[0048] A metal cover is provided at the rear of the stepper motor 207 and is located on the rear end face of the mold mounting base A5, and the mold mounting base A5 and the metal cover are fixed by screws; the metal cover can protect the stepper motor 207, and when the stepper motor 207 fails, the metal cover can be removed for repair.

[0049] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

Claims

1. A plastic injection molding machine, comprising an injection molding machine (1), characterized in that: On one side inside the injection molding machine (1), a main pushing cylinder (3) is fixedly installed. At each of the four end corners on the front end face of the main pushing cylinder (3), a piston rod (4) is connected. Outside the top ends of the four piston rods (4), there is a mold mounting base A (5). In front of the mold mounting base A (5), there is a mold mounting base B (7). On the face of the mold mounting base A (5) facing the mold mounting base B (7) and on the face of the mold mounting base B (7) facing the mold mounting base A (5), an injection mold (6) is installed. Between the two injection molds (6), there is a mold cavity (8). Behind the mold cavity (8), there is a non-injection-rod injection mechanism (2). The non-injection-rod injection mechanism (2) includes an injection port A (204), an injection port B (205), a sealing rod (215), and a threaded connection type sealing and pushing mechanism. The injection port A (204) is located at the middle position of the rear end face of the injection mold (6) and is communicated with the inside of the mold cavity (8). The injection port B (205) is located inside the mold mounting base A (5) and corresponds to the position of the injection port A (204). The total length of the inner walls of the injection port A (204) and the injection port B (205) is the same as the length of the sealing rod (215), and the inner wall diameters of the injection port A (204) and the injection port B (205) are the same as the outer surface diameter of the sealing rod (215). The threaded connection type sealing and pushing mechanism can rotate and move the sealing rod (215) back and forth at the same time; At each of the four end corners inside the mold mounting base A (5), there is an energy-saving base anti-cracking mechanism respectively fixed to the top ends of the four piston rods (4). The energy-saving base anti-cracking mechanism includes two elastic connection mechanisms, two L-shaped fixing rods (14), two pushing blocks (10), two inclined surfaces A (11), two strip-shaped storage grooves (19), a limiting groove (9), and an annular fixing groove (12). The two strip-shaped storage grooves (19) are respectively located on the upper and lower inner walls of the limiting groove (9). The annular fixing groove (12) is located behind the two limiting grooves (9) and is simultaneously communicated with the inside of the two limiting grooves (9); The front end of the L-shaped fixing rod (14) is connected to the mold mounting base B (7) through an elastic connection mechanism. The rear end of the L-shaped fixing rod (14) is inserted into the inside of the annular fixing groove (12), and the width of the rear end of the L-shaped fixing rod (14) is greater than the width of the inner wall of the strip-shaped storage groove (19). The two pushing blocks (10) are respectively fixed to the upper and lower surfaces of the top end of the piston rod (4), and the surface of the pushing block (10) facing the rear end of the L-shaped fixing rod (14) is an inclined surface A (11); The elastic connection mechanism includes a strip-shaped groove (16). Inside the strip-shaped groove (16), a metal rod (17) is fixedly installed. A spring (18) is sleeved on the outer surface of the metal rod (17); The outer surface of the metal rod (17) is movably sleeved on the top end of the L-shaped fixing rod (14), and the surface of the spring (18) facing the L-shaped fixing rod (14) is connected to the L-shaped fixing rod (14). The energy-saving base anti-cracking mechanism further includes two slots (13) located on the front end face of the mold mounting base A (5). Both of the two slots (13) communicate with the inside of the annular fixing groove (12), and the rear end face of the L-shaped fixing rod (14) located inside the annular fixing groove (12) is an inclined surface B (15).

2. The plastic injection molding machine according to claim 1, wherein: The injection molding mechanism without an injection rod (2) further includes an injection tube (201). A solution plastic transfer groove (202) is provided on the outer side of the top end of the injection tube (201) at the middle position of the rear end face of the mold mounting base A (5), and an internal thread transfer port (203) communicating with the inside of the injection port B (205) is provided at the middle position of the front inner wall of the injection tube (201).

3. The plastic injection molding machine according to claim 2, characterized in that: The threaded connection type sealing and pushing mechanism includes a stepping motor (207). The output shaft of the stepping motor (207) is connected to a transmission rotating shaft (208) through a coupling. A cylindrical metal shell (206) is provided below the transmission rotating shaft (208) inside the solution plastic transfer groove (202). A support plate (217) is fixedly provided at the middle positions of the upper and lower end faces of the cylindrical metal shell (206). The other end of the support plate (217) is fixed to the inner wall of the solution plastic transfer groove (202), and the stepping motor (207) is located above the solution plastic transfer groove (202).

4. A plastic injection molding machine according to claim 3, characterized in that: A square rotating shaft (210) is provided inside the cylindrical metal shell (206). The rear end of the square rotating shaft (210) is connected in series with the transmission rotating shaft (208) through a synchronous chain (209).

5. The plastic injection molding machine according to claim 4, characterized in that: A cylindrical groove (211) is provided on the outer side of the square rotating shaft (210) inside the cylindrical metal shell (206). A limiting ring (212) fitting with the inner wall is provided on one side inside the cylindrical groove (211). A sealing threaded rod (213) is fixedly provided on the front end face of the limiting ring (212). An internal thread transmission groove (214) is provided on the outer side of the top end of the sealing threaded rod (213) at the middle position of the front end face of the cylindrical metal shell (206). The internal threads of the internal thread transmission groove (214) and the internal thread transfer port (203) are both matched with the external thread of the sealing threaded rod (213), and a sealing rod (215) is fixed at the middle position of the front end face of the sealing threaded rod (213).

6. A plastic injection molding machine according to claim 5, characterized in that: A middle position of the rear end face of the limiting ring (212) penetrates through the limiting ring (212) and the sealing threaded rod (213) and extends to the inside of the sealing rod (215), and the square rotating shaft (210) is inserted into the inside of the square transmission rotating shaft (216). The cross-sectional shape of the square rotating shaft (210) is square, the inner wall of the square transmission rotating shaft (216) fits against the outer surface of the square rotating shaft (210), and the square rotating shaft (210) is slidably connected to the square transmission rotating shaft (216).

7. A plastic injection molding machine according to claim 3, characterized in that: A metal cover plate is provided behind the stepping motor (207) at the rear end face of the mold mounting base A (5), and the mold mounting base A (5) and the metal cover plate are fixed by screws.

Images