Plastic injection molding machine

Abstract

The invention relates to the technical field of plastic injection molding, in particular to a plastic injection molding machine which comprises an injection molding machine, and through an energy-saving type base anti-cracking mechanism, when a mold mounting base A and a mold mounting base B of which the outer surfaces are provided with injection molds are attached to each other, the mold mounting base A and the mold mounting base B can be automatically fixed; during cooling, the injection molding opening A can be automatically sealed through the injection molding rod-free injection molding mechanism, so that plastic rods are prevented from appearing on a finished product, and through the technical scheme, the production steps are reduced, and meanwhile, a hydraulic air cylinder does not need to be started all the time in the injection molding process; when a plastic injection molding machine is used, in order to prevent mutually attached molds from being separated due to internal force, a hydraulic air cylinder and hot melt plastic located in a mold cavity need to be started all the time for cooling; and hot melt plastic which is located in the injection molding opening and connected with the injection molding opening is cooled along with the injection molding opening, so that a plastic rod is formed on the outer surface of a finished product.

Description

Technical Field

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

[0002] Plastic injection molding machine, also known as injection molding machine or plastic injection machine, is a main molding equipment that uses plastic molding molds to make plastic products of various shapes such as disposable plastic forks, plastic furniture and plastic shells of various objects from thermoplastics or thermosetting materials.

[0003] The working principle of a plastic injection molding machine is similar to that of a syringe used for injections. It uses the thrust of a screw (or plunger) to inject plasticized plastic in a molten state (i.e., a viscous flow state) into a closed mold cavity, and obtains the product after solidification and shaping. Injection molding is a cyclic process, and each cycle mainly includes: quantitative feeding, melt plasticization, pressure injection, mold filling and cooling, mold opening and part removal, and after taking out the plastic part, the mold is closed again for the next cycle.

[0004] However, when using this equipment, in order to ensure that the two molds that fit each other will not separate due to the pressure inside the mold cavity, thereby causing leakage of the hot-melt plastic, it is necessary to keep the hydraulic cylinder used to push the mold to move and provide pressure for it to prevent leakage. The hydraulic cylinder in this state will consume more energy when working continuously, and will cause a certain load on the hydraulic system, thereby affecting its service life. When the hot-melt plastic 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, which needs to be manually cut off later, and the operation is relatively cumbersome; therefore, it does not meet the existing needs, and we have proposed a plastic injection molding machine for this. Summary of the invention

[0005] The object of the present invention is to provide a plastic injection molding machine to solve the problem proposed in the above background technology that when using this equipment, in order to ensure that two molds that fit each other will not separate due to the pressure inside the mold cavity, thereby causing leakage of hot-melt plastic, it is necessary to keep the hydraulic cylinder used to push the mold to move and provide pressure for it to prevent leakage. In this state, the hydraulic cylinder will consume more energy when working continuously, and will cause a certain load on the hydraulic system, thereby affecting its service life. When the hot-melt plastic inside the mold cavity is cooled, the hot-melt plastic inside the injection port connected to it will be cooled together, thereby forming a plastic rod on the outer surface of the finished product, which needs to be manually cut off later, and the operation is relatively cumbersome.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a plastic injection molding machine, comprising an injection molding machine, a main push cylinder is fixedly installed on one side inside the injection molding machine, four end corners of the front end surface of the main push cylinder are connected to a piston rod, a mold mounting base A is provided on the outer side of the top end of the four piston rods, a mold mounting base B is provided in front of the mold mounting base A, an injection mold is installed on the surface of the mold mounting base A facing the mold mounting base B and the surface of the mold mounting base B facing the mold mounting base A, a mold cavity is provided between the two injection molds, and the mold An injection molding mechanism without an injection molding rod is provided at the rear of the cavity, and the injection molding mechanism without an injection molding rod includes an injection molding port A, an injection molding port B, a sealing rod and a threaded sealing pushing mechanism, wherein the injection molding port A is located in the middle position of the rear end face of the injection mold and communicates with the interior of the mold cavity, and the injection molding port B is located inside the mold mounting base A and corresponds to the position of the injection molding port A, and the total length of the inner wall of the injection molding port A and the injection molding port B is the same as the length of the sealing rod, and the inner wall diameter of the injection molding port A and the injection molding port B is the same as the outer surface diameter of the sealing rod, and the sealing rod can be moved forward and backward while rotating through the threaded sealing pushing mechanism; Each of the four end corners inside the mold mounting base A is provided with an energy-saving base anti-cracking mechanism respectively fixed to the top ends of the four piston rods, and 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 receiving grooves, a limiting groove and an annular fixing groove, the two strip-shaped receiving grooves are respectively located at the upper and lower end inner walls of the limiting grooves, and the annular fixing groove is located behind the two limiting grooves and communicates with the inside of the two limiting grooves at the same time; The front end of the L-shaped fixing rod is connected to the mold mounting base B through an elastic connection mechanism, and the rear end of the L-shaped fixing rod is inserted into 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 storage groove; The two pushing blocks are respectively fixed on 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.

[0007] Preferably, the elastic connection mechanism comprises a strip groove, a metal rod is fixedly provided inside the strip groove, and a spring is sleeved on the outer surface of the metal rod.

[0008] Preferably, the top end of the L-shaped fixing rod is movably sleeved with 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.

[0009] Preferably, the energy-saving base anti-cracking mechanism also includes two slots, which are located on the front end surface of the mold mounting base A. Both of the slots are connected to the interior of the annular fixing groove, and the rear end surface of the L-shaped fixing rod located inside the annular fixing groove is an inclined surface B.

[0010] Preferably, the injection molding mechanism without injection molding rod also includes an injection molding tube, and the outer side of the top end of the injection molding tube is provided with a solution plastic transmission groove located in the middle position of the rear end surface of the mold mounting base A, and the middle position of the inner wall of the front end of the injection molding tube is provided with an internal thread transmission port connected to the inside of the injection molding port B.

[0011] Preferably, the threaded sealing pushing mechanism includes a stepper motor, the output shaft of the stepper motor is connected to a transmission shaft via a coupling, a cylindrical metal shell located inside the solution plastic transmission groove is provided below the transmission shaft, a support plate is fixedly provided in the middle position of the upper and lower end surfaces of the cylindrical metal shell, the other end of the support plate is fixed to the inner wall of the solution plastic transmission groove, and the stepper motor is located above the solution plastic transmission groove.

[0012] Preferably, a square rotating shaft is provided inside the cylindrical metal shell, and the rear end of the square rotating shaft is connected in series with the transmission rotating shaft via a synchronous chain.

[0013] Preferably, the outer side of the square rotating shaft is provided with a cylindrical groove located inside the cylindrical metal shell, one side of the cylindrical groove is provided with a limiting ring fitted with its inner wall, the front end face of the limiting ring is fixed with a sealing threaded rod, the outer side of the top end of the sealing threaded rod is provided with an internal thread transmission groove located in 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 transmission port are matched with the external threads 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.

[0014] Preferably, a threaded rod penetrating the limit ring and the sealing rod is provided in the middle of the rear end surface of the limit ring so as to extend to the inside of the sealing rod, and the square shaft is inserted into the inside of the square transmission shaft; The cross-sectional shape of the square rotating shaft is a square, the inner wall of the square transmission rotating shaft is fitted with the outer surface of the square rotating shaft, and the square rotating shaft is slidably connected with the square transmission rotating shaft.

[0015] Preferably, a metal cover plate located on the rear end surface of the mold mounting base A is provided behind the stepper motor, and the mold mounting base A and the metal cover plate are fixed by screws.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention uses an energy-saving base anti-cracking mechanism. When the mold mounting base A and the mold mounting base B with the injection mold mounted on the outer surface are fitted to each other, the two can be automatically fixed to each other, so as to prevent the two injection molds from being separated due to pressure during the later injection molding process. During the subsequent injection molding and cooling process, the push main cylinder can be closed to make 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 push main cylinder can be used to push the piston rod backward to release the fixation between the two and then pull the mold mounting base A backward. Through the above technical solution, when the two injection molds are closely fitted, the push main cylinder can stop working, so that it no longer needs to maintain thrust continuously, which reduces the operating time of the hydraulic system, thereby reducing energy consumption and reducing the operating time of the push main cylinder to reduce the load of the system, which helps to extend the service life of the system and reduce the failure rate; 2. The present invention can automatically move the sealing rod forward to seal the injection port A used for injection molding when the injection molding is completed and cooling is carried out through the injection molding mechanism without an injection molding rod, 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 it is no longer necessary to manually cut off the plastic rods, thereby reducing its production steps. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a front view of the internal structure of the present invention as a whole; Figure 3 For the present invention Figure 2 A magnified view of the structure at center A; Figure 4 For the present invention Figure 3 A magnified view of the structure at B in the middle; Figure 5 For the present invention Figure 3 A magnified view of the structure at C in the middle; Figure 6 For the present invention Figure 5 Enlarged view of the structure at D in the middle.

[0018] In the figure: 1. Injection molding machine; 2. Injection molding mechanism without injection molding rod; 201. Injection molding tube; 202. Solution plastic transmission groove; 203. Internal thread transmission port; 204. Injection molding port A; 205. Injection molding port B; 206. Cylindrical metal shell; 207. Stepper motor; 208. Transmission shaft; 209. Synchronous chain; 210. Square shaft; 211. Cylindrical groove; 212. Limiting ring; 213. Sealing threaded rod; 214. Internal thread transmission groove; 215. Sealing rod; 216. Square transmission shaft; 217. Support plate; 3. Push main cylinder; 4. Piston rod; 5. Mold mounting base A; 6. Injection mold; 7. Mold mounting base B; 8. Mold cavity; 9. Limiting groove; 10. Push 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 DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0020] See also Figures 1 to 6 An embodiment of the present invention is as follows: a plastic injection molding machine, comprising an injection molding machine 1, a main push cylinder 3 is fixedly installed on one side of the injection molding machine 1, four end corners of the front end surface of the main push cylinder 3 are connected with a piston rod 4, a mold mounting base A5 is provided on the outer side of the top end of the four piston rods 4, a mold mounting base B7 is provided in front of the mold mounting base A5, an injection mold 6 is installed on the surface of the mold mounting base A5 facing the mold mounting base B7 and the surface of the mold mounting base B7 facing the mold mounting base A5, a mold cavity 8 is provided between the two injection molds 6, and an injection molding mechanism 2 without an injection molding rod is provided behind the mold cavity 8, and an injection molding mechanism without an injection molding rod is provided. The rod-type injection molding mechanism 2 includes an injection port A204, an injection port B205, a sealing rod 215 and a threaded connection type sealing push mechanism. The injection port A204 is located at the middle position of the rear end surface of the injection mold 6 and communicates with the interior of the mold cavity 8. The injection port B205 is located inside the mold mounting base A5 and corresponds to the position of the injection port A204. The total length of the inner wall of the injection port A204 and the injection port B205 is the same as the length of the sealing rod 215, and the inner wall diameter of the injection port A204 and the injection port B205 is the same as the outer surface diameter of the sealing rod 215. The sealing rod 215 can be moved forward and backward while rotating through the threaded connection type sealing push mechanism. Each of the four end corners inside the mold mounting base A5 is provided with an energy-saving base anti-cracking mechanism respectively fixed to the top ends of the four piston rods 4, and 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 receiving grooves 19, a limiting groove 9 and an annular fixing groove 12, the two strip-shaped receiving grooves 19 are respectively located on the upper and lower end inner walls of the limiting groove 9, and the annular fixing groove 12 is located behind the two limiting grooves 9 and communicates with the inside of the two limiting grooves 9 at the same time; The front end of the L-shaped fixing rod 14 is connected to the mold mounting base B7 through an elastic connection mechanism, and the rear end of the L-shaped fixing rod 14 is inserted into 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 storage groove 19; The two pushing blocks 10 are fixed to the upper and lower surfaces of the top end of the piston rod 4 respectively, and the surface of the pushing block 10 facing the rear end of the L-shaped fixing rod 14 is an inclined surface A11.

[0021] Please continue reading Figures 1 to 6 The elastic connection mechanism provided by the present invention includes a strip groove 16, a metal rod 17 is fixedly provided inside the strip groove 16, and 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 with the outer surface of the metal rod 17, and 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, the injection mold 6 is installed on the opposite surfaces of the mold mounting base A5 and the mold mounting base B7, and then the power supply is connected, and the mold mounting base A5 is pushed forward by pushing the main cylinder 3.

[0022] The energy-saving base anti-cracking mechanism also includes two slots 13, which are located on the front end surface of the mold mounting base A5. The two slots 13 are both connected to the inside of the annular fixing groove 12, and the rear end surface of the L-shaped fixing rod 14 located inside the annular fixing groove 12 is an inclined surface B15; as the mold mounting base A5 moves, the inclined surface B15 located on the rear end surface of the L-shaped fixing rod 14 will contact the slots 13 and push the L-shaped fixing rod 14 outward. When the L-shaped fixing rod 14 moves outward, it will squeeze the spring 18 connected to it. When the mold mounting base A5 is combined with the mold mounting base B7, the two injection molds 6 respectively installed on the outer surfaces of the mold mounting base A5 and the mold mounting base B7 will also fit each other, and a mold cavity 8 will be generated between the two. When the mold mounting base A5 and the mold mounting base B7 are closed to each other, the top end of the L-shaped fixing rod 14 will also move to the position of the annular fixing groove 12, and the reaction force of the squeezed spring 18 can push the L-shaped fixing rod 14 inward, so that the rear end of the L-shaped fixing rod 14 is stuck in the inside of the annular fixing groove 12 located inside the mold mounting base A5, and because 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 receiving groove 19, there is no need to worry about the rear end of the L-shaped fixing rod 14 entering the inside of the strip receiving groove 19 communicating with the annular fixing groove 12; When the L-shaped fixing rod 14 is inserted into the annular fixing groove 12, the mold mounting base A5 and the mold mounting base B7 will also be fixed to each other. When the two are fixed, the push main cylinder 3 can be closed to let them 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 by pushing the main cylinder 3. When the piston rod 4 moves backward, the push block 10 fixed to the outer surface of the piston rod 4 will move backward together. As the push block 10 moves, the inclined surface A11 located at the rear end face of the push block 10 will contact the L-shaped fixing rod 14 stuck in the annular fixing groove 12, and push the L-shaped fixing rod 14 outward to make it completely leave the inside of the annular fixing groove 12, so as to release the mold mounting base. The fixation between the seat A5 and the mold mounting base B7, when the fixation between the two is released, the push block 10 will enter the inside of the annular fixing groove 12 as the piston rod 4 moves, and when the inclined surface A11 located at the rear end face of the push block 10 contacts the inner wall of the annular fixing groove 12, the mold mounting base A5 will be pulled backwards as the piston rod 4 moves, so as to separate the mold mounting base A5 from the mold mounting base B7. Through the above technical solution, when the two injection molds 6 are tightly fitted, the push main cylinder 3 can stop working, so that it no longer needs to maintain thrust continuously, which reduces the operating time of the hydraulic system, thereby reducing energy consumption and can reduce the operating time of the push main cylinder 3 to reduce the load on the system, which helps to extend the service life of the system and reduce the failure rate.

[0023] The rod-free injection molding mechanism 2 provided by the present invention also includes an injection molding tube 201, and the outer side of the top end of the injection molding tube 201 is provided with a solution plastic transmission groove 202 located in the middle position of the rear end surface of the mold mounting base A5, and the middle position of the inner wall of the front end of the injection molding tube 201 is provided with an internal thread transmission port 203 that communicates with the interior of the injection port B205; when the two injection molds 6 are closed to each other and injection molding operation is required, hot melt plastic is poured into the interior of the solution plastic transmission groove 202 through the injection molding tube 201, and the hot melt plastic will enter the interior of the internal thread transmission port 203 along the solution plastic transmission groove 202, and finally enter the interior of the mold cavity 8 along the internal thread transmission port 203, the injection port B205 and the injection port A204.

[0024] The threaded sealing push mechanism includes a stepper motor 207, the output shaft of the stepper motor 207 is connected to a transmission shaft 208 through a coupling, a cylindrical metal shell 206 located inside the solution plastic transmission groove 202 is provided below the transmission shaft 208, a support plate 217 is fixedly provided in the middle position of the upper and lower end surfaces of the cylindrical metal shell 206, and the other end of the support plate 217 is fixed to the inner wall of the solution plastic transmission groove 202; when the hot-melt plastic is poured and the cooling operation begins, the stepper motor 207 is started, and the stepper motor 207 can drive the transmission shaft 208 connected thereto to rotate.

[0025] A square shaft 210 is provided inside the cylindrical metal shell 206 , and the rear end of the square shaft 210 is connected in series with the transmission shaft 208 via a synchronous chain 209 ; when the transmission shaft 208 rotates, the square shaft 210 connected in series with it via the synchronous chain 209 will rotate along with it.

[0026] Furthermore, a cylindrical groove 211 located inside the cylindrical metal shell 206 is provided on the outer side of the square shaft 210, and a limiting ring 212 fitted with its inner wall is provided on one side inside the cylindrical groove 211, and a sealing threaded rod 213 is fixedly provided on the front end face of the limiting ring 212, and an internal thread transmission groove 214 located in the middle position of the front end face of the cylindrical metal shell 206 is provided on the outer side of the top end of the sealing threaded rod 213, and the internal threads of the internal thread transmission groove 214 and the internal thread transmission port 203 are matched with the external threads of the sealing threaded rod 213, and the sealing rod 215 is fixed in the middle position of the front end face of the sealing threaded rod 213; a thread penetrating through the limiting ring 212 and the sealing threaded rod 213 and extending to the inside of the sealing rod 215 is provided in the middle position of the rear end face of the limiting ring 212, and the square shaft 210 is inserted into the inside of the square transmission shaft 216.

[0027] The cross-sectional shape of the square shaft 210 is a square, the inner wall of the square transmission shaft 216 is fitted with the outer surface of the square shaft 210, and the square shaft 210 and the square transmission shaft 216 are slidingly connected; since the outer surface of the square shaft 210 is fitted with the inner wall of the cylindrical metal shell 206, when the square shaft 210 rotates, it will drive the sealing threaded rod 213 to rotate together, and through the internal thread transmission of the internal thread transmission groove 214, the rotating sealing threaded rod 213 will move back and forth accordingly. At this time, the sealing threaded rod 213 moves forward, and as the sealing threaded rod 213 moves, the sealing rod 215 fixed to the front end face of the sealing threaded rod 213 will enter the interior of the injection port B205 and pass through the injection port B205 into the interior of the injection port A204.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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: A push main cylinder (3) is fixedly installed on one side inside the injection molding machine (1), and the four end corners of the front end surface of the push main cylinder (3) are connected to a piston rod (4). A mold mounting base A (5) is provided on the outer side of the top end of the four piston rods (4), and a mold mounting base B (7) is provided in front of the mold mounting base A (5). An injection mold (6) is installed on the surface of the mold mounting base A (5) facing the mold mounting base B (7) and the surface of the mold mounting base B (7) facing the mold mounting base A (5). A mold cavity (8) is provided between the two injection molds (6), and an injection molding mechanism (2) without an injection molding rod is provided behind the mold cavity (8). The injection molding mechanism (2) without an injection molding rod includes The invention comprises an injection port A (204), an injection port B (205), a sealing rod (215) and a threaded sealing push mechanism, wherein the injection port A (204) is located in the middle of the rear end surface of the injection mold (6) and communicates with the interior 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 wall 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 diameter of the injection port A (204) and the injection port B (205) is the same as the outer surface diameter of the sealing rod (215), and the sealing rod (215) can be moved forward and backward while rotating through the threaded sealing push mechanism; Each of the four end corners inside the mold mounting base A (5) is provided with 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 comprising two elastic connection mechanisms, two L-shaped fixing rods (14), two pushing blocks (10), two inclined surfaces A (11), two strip-shaped receiving grooves (19), a limiting groove (9) and an annular fixing groove (12), the two strip-shaped receiving grooves (19) being respectively located on the upper and lower inner walls of the limiting groove (9), the annular fixing groove (12) being located behind the two limiting grooves (9) and communicating with the inside of the two limiting grooves (9) at the same time; The front end of the L-shaped fixing rod (14) is connected to the mold mounting base B (7) via an elastic connection mechanism, the rear end of the L-shaped fixing rod (14) is inserted into 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).

2. A plastic injection molding machine according to claim 1, characterized in that: The elastic connection mechanism comprises a strip groove (16), a metal rod (17) is fixedly arranged inside the strip groove (16), and a spring (18) is sleeved on the outer surface of the metal rod (17).

3. A plastic injection molding machine according to claim 2, characterized in that: The top end of the L-shaped fixing rod (14) is movably sleeved with the outer surface of a metal rod (17), and the surface of the spring (18) facing the L-shaped fixing rod (14) is connected to the L-shaped fixing rod (14).

4. A plastic injection molding machine according to claim 3, characterized in that: The energy-saving base anti-cracking mechanism further comprises two slots (13), the slots (13) being located at the front end surface of the mold mounting base A (5), the two slots (13) being communicated with the interior of the annular fixing groove (12), and the rear end surface of the L-shaped fixing rod (14) located inside the annular fixing groove (12) being an inclined surface B (15).

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

6. A plastic injection molding machine according to claim 5, characterized in that: The threaded connection type sealing push mechanism comprises a stepping motor (207), the output shaft of the stepping motor (207) being connected to a transmission shaft (208) via a coupling, a cylindrical metal shell (206) located inside the solution plastic transmission groove (202) being provided below the transmission shaft (208), a support plate (217) being fixedly provided at the middle position of the upper and lower end surfaces of the cylindrical metal shell (206), the other end of the support plate (217) being fixed to the inner wall of the solution plastic transmission groove (202), and the stepping motor (207) being located above the solution plastic transmission groove (202).

7. A plastic injection molding machine according to claim 6, characterized in that: A square rotating shaft (210) is provided inside the cylindrical metal shell (206), and a rear end of the square rotating shaft (210) is connected in series with the transmission rotating shaft (208) via a synchronous chain (209).

8. A plastic injection molding machine according to claim 7, characterized in that: The outer side of the square rotating shaft (210) is provided with a cylindrical groove (211) located inside the cylindrical metal shell (206); one side of the cylindrical groove (211) is provided with a limit ring (212) that fits with the inner wall thereof; a sealing threaded rod (213) is fixedly provided on the front end face of the limit ring (212); an internal thread transmission groove (214) located in the middle position of the front end face of the cylindrical metal shell (206) is provided on the outer side of the top end of the sealing threaded rod (213); the internal threads of the internal thread transmission groove (214) and the internal thread transmission port (203) both match the external threads of the sealing threaded rod (213), and the sealing rod (215) is fixed in the middle position of the front end face of the sealing threaded rod (213).

9. A plastic injection molding machine according to claim 8, characterized in that: A threaded rod (213) is provided in the middle of the rear end surface of the limiting ring (212) so as to penetrate the limiting ring (212) and the sealing threaded rod (213) and extend 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 a 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) and the square transmission rotating shaft (216) are slidably connected.

10. A plastic injection molding machine according to claim 6, characterized in that: A metal cover plate is provided at the rear of the stepper motor (207) and is located on the rear end surface of the mold mounting base A (5), and the mold mounting base A (5) and the metal cover plate are fixed by screws.

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