Uniform eccentricity-preventing injection mold

Abstract

The application relates to the technical field of injection molds, in particular to a uniform anti-eccentric injection mold, which comprises a lower mold structure and an upper mold structure, and the lower mold structure and the upper mold structure each comprise a primary mold body and a secondary mold body; a primary main air inlet cavity, a secondary main air inlet cavity, a primary secondary air inlet cavity, a secondary secondary air inlet cavity and a primary piston groove are formed in the primary mold body; a primary piston is movably arranged in the primary piston groove; a limiting assembly is arranged in a limiting piece mounting groove on the two sides of the primary piston groove; the primary piston is limited by the limiting assembly; the gas supply equipment continuously pressurizes; when the limiting assembly is loosened, the primary piston moves to the other side of the primary piston groove under the action of the pressure, impact vibration is formed, the material in the mold groove is better distributed, and the forming effect of the injection molded part is effectively improved.

Description

Technical Field

[0001] This invention relates to the technical field of injection molds, specifically to a uniform anti-eccentric injection mold. Background Technology

[0002] Injection molding, also known as injection molding, is a molding method that combines injection and molding. The advantages of injection molding include high production speed and efficiency, automated operation, a wide variety of designs and shapes (from simple to complex), and sizes ranging from large to small. It also produces dimensionally accurate products, facilitates product updates and replacements, and can create complex shapes. Injection molding is suitable for mass production and molding processes involving complex shapes.

[0003] Injection molding is a process in which plastic material is completely melted by a screw at a certain temperature, injected into a mold cavity under high pressure, and then cooled and solidified to obtain a molded product. This method is suitable for the mass production of complex-shaped parts and is one of the important processing methods.

[0004] However, traditional injection molds do not have a dedicated structure to prevent the uniform distribution of the injectiond plastic. They usually rely on pressure to achieve uniform material distribution, but this method is effective, resulting in certain defects in the molded parts. Therefore, this invention proposes a uniform anti-eccentric injection mold to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a uniform anti-eccentric injection mold to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a uniform anti-eccentric injection mold, comprising: a lower mold structure and an upper grinding structure, the lower mold structure and the upper grinding structure being symmetrically arranged, and mold grooves being provided on the upper side of the lower mold structure and the lower side of the upper grinding structure, the mold grooves on the upper grinding structure being connected to the feed pipe, the lower mold structure and the upper grinding structure each comprising: a primary mold body, the primary mold body having a primary main air intake chamber, a secondary main air intake chamber, a primary secondary air intake chamber, a secondary secondary air intake chamber, and a primary piston groove, the primary main air intake chamber and the secondary main air intake chamber being symmetrically arranged, and the ports of the primary main air intake chamber and the secondary main air intake chamber being respectively formed with a primary air intake pipe connection port and a secondary air intake pipe connection port, the primary secondary air intake chamber and the secondary secondary air intake chamber being provided with multiple channels at equal intervals, the primary secondary air intake chamber and the secondary secondary air intake chamber being provided with multiple channels at equal intervals. The primary secondary air intake chamber is connected to the primary main air intake chamber, and the secondary secondary air intake chamber is connected to the secondary main air intake chamber. The primary and secondary air intake chambers are arranged in a group. The primary piston groove is located between the primary and secondary air intake chambers in the same group, and both ends of the primary piston groove are connected to the primary and secondary air intake chambers through a primary connecting chamber and a secondary connecting chamber, respectively. A primary piston is movably installed in the primary piston groove. A limit component mounting groove is formed on the side wall of the primary piston groove. A limit component is installed in the limit component mounting groove. When the primary piston moves to abut against the end face of the primary piston groove, the other side of the primary piston is limited by the limit component. The secondary mold body is symmetrically arranged with the primary mold body, and both of them have the same slot structure.

[0007] Preferably, the primary mold body has a threaded hole, and the secondary mold body has a screw hole. The screw hole and the threaded hole are respectively provided, and the screw hole, the threaded hole and the slot on the primary mold body and the secondary mold body are all staggered. The primary mold body and the secondary mold body are positioned by positioning screws.

[0008] Preferably, the primary air intake pipe connection port is connected to the primary air supply equipment through the primary air intake pipe, and the secondary air intake pipe connection port is connected to the secondary air supply equipment through the secondary air intake pipe. The primary air intake pipe and the secondary air intake pipe are respectively connected to a primary pressure relief valve and a secondary pressure relief valve.

[0009] Preferably, the limiting component mounting groove is composed of a primary piston rod groove, a secondary piston groove, a secondary piston rod groove, and a stepped groove. The secondary piston groove is connected to the primary piston through the primary piston rod groove, and the secondary piston rod groove is connected to the outer end of the secondary piston groove. The stepped groove is formed at the bottom of the inner end of the secondary piston groove. The primary piston rod groove, the secondary piston rod groove, and the stepped groove are coaxially arranged. The bottom of the stepped groove is provided with a primary air inlet and a secondary air inlet.

[0010] Preferably, the limiting assembly is composed of a piston rod, a secondary piston, a holding spring, and a push rod. The piston rod and the secondary piston are integrally formed, and a push rod groove is formed on the outer side of the piston rod. The holding spring and the push rod are both movably disposed in the push rod groove, and the push rod is connected to the bottom of the push rod groove through the holding spring. The piston rod is movably disposed in the primary piston rod groove and the secondary piston rod groove, and the secondary piston is movably disposed in the secondary piston groove. When the holding spring is in the reset state, the end of its piston rod is inserted into the primary piston groove, and at this time, the primary piston is limited by the piston rod.

[0011] Preferably, the diameter of the stepped groove opening is smaller than the diameter of the secondary piston groove, and when the top holding spring is in the reset state, the inner end face of the secondary piston abuts against the port position of the stepped groove.

[0012] Preferably, the end of the primary air intake is connected to a primary blocking groove, and the primary blocking groove is connected to the primary connecting cavity through a primary through hole. The end of the secondary air intake is connected to a secondary blocking groove, and the secondary blocking groove is connected to the secondary connecting cavity through a secondary through hole. A primary blocking component and a secondary blocking component are respectively provided in the primary blocking groove and the secondary blocking groove.

[0013] Preferably, both the primary blocking component and the secondary blocking component are composed of an annular plate, a support spring, and a blocking seat. The two ends of the support spring are connected to the annular plate and the blocking seat, respectively. The blocking seat has a cylindrical structure, and the diameter of the blocking seat is greater than the diameter of the primary through hole, while the diameter of the blocking seat is less than the diameter of the primary blocking groove.

[0014] Preferably, a guide rod is integrally formed on the side wall of the blocking seat. The guide rod is a cylindrical structure with a semi-circular cross-section, and the guide rod is evenly arranged in a circle. When the blocking seat is actually installed, the guide rod is abutted against the side wall of the blocking groove.

[0015] Preferably, a set of limiting components is symmetrically arranged, and the side walls of the stepped grooves on the limiting component mounting grooves on both sides of the primary piston groove are connected by an annular groove.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. By setting up a uniform anti-eccentric injection mold composed of a lower mold structure and an upper grinding structure, and setting both the lower mold structure and the upper grinding structure to be composed of a primary mold body and a secondary mold body, and opening a primary main air inlet chamber, a secondary main air inlet chamber, a primary secondary air inlet chamber, a secondary secondary air inlet chamber and a primary piston groove on the primary mold body, and movably installing a primary piston in the primary piston groove, and setting limiting components in the limiting component mounting slots on both sides of the primary piston groove, the primary piston is limited by the limiting components. By continuously pressurizing through the air supply equipment, when the limiting components are released, the primary piston moves quickly to the other side of the primary piston groove under pressure, thereby forming an impact vibration effect, so that the material in the mold groove can be better evenly distributed, thereby effectively improving the molding effect of the injection molded part;

[0018] 2. By configuring the limiting component mounting groove as a combination of a primary piston rod groove, a secondary piston groove, a secondary piston rod groove, and a stepped groove, and configuring the limiting component as a combination of a piston rod, a secondary piston, a top holding spring, and a top rod, a primary air inlet and a secondary air inlet are opened at the bottom of the stepped groove. A primary blocking groove and a secondary blocking groove are respectively set at the ends of the primary air inlet and the secondary air inlet, and the primary blocking groove and the secondary blocking groove are connected to the primary connecting cavity and the secondary connecting cavity through the primary through hole and the secondary through hole, respectively. A primary blocking component and a secondary blocking component are respectively set in the primary blocking groove and the secondary blocking groove, so that the power source of the limiting component and the power source of the primary piston are shared, thereby effectively optimizing the power structure in the injection mold and effectively reducing the use cost. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention.

[0020] Figure 2 This is a schematic diagram of the lower mold structure of the present invention.

[0021] Figure 3 This is a schematic diagram showing the positions of the primary main intake chamber, secondary main intake chamber, primary secondary intake chamber, secondary secondary intake chamber, and primary piston groove of the present invention.

[0022] Figure 4 for Figure 3 Enlarged schematic diagram of the structure at point A in the middle.

[0023] Figure 5 This is a half-sectional view of the lower mold structure of the present invention.

[0024] Figure 6 for Figure 5 Enlarged schematic diagram of the structure at point B.

[0025] Figure 7 for Figure 6 Enlarged schematic diagram of the structure at point C.

[0026] Figure 8 This is a schematic diagram of the first-stage piston installation of the present invention.

[0027] Figure 9 for Figure 8 Enlarged schematic diagram of the structure at point D.

[0028] In the diagram: 1. Lower mold structure; 2. Upper grinding structure; 3. Feed pipe; 4. Primary mold body; 5. Secondary mold body; 6. Primary main air inlet chamber; 7. Secondary main air inlet chamber; 8. Primary secondary air inlet chamber; 9. Secondary secondary air inlet chamber; 10. Primary piston groove; 11. Primary connecting cavity; 12. Secondary connecting cavity; 13. Threaded hole; 14. Screw hole; 15. Mold groove; 16. Primary air inlet pipe connection port; 17. Secondary air inlet pipe connection port; 18. Primary piston; 19. Limiting assembly; 20. Primary piston rod groove; 21. Secondary piston groove; 22. Secondary piston rod groove; 23. Stepped groove; 24. Primary air inlet hole; 25. Primary blocking groove; 26. Primary through hole; 27. Secondary blocking groove; 28. Secondary through hole; 29. ​​Primary blocking assembly; 30. Secondary blocking assembly; 31. Piston rod; 32. Secondary piston; 33. Top holding spring; 34. Top rod; 35. Annular plate; 36. Support spring; 37. Blocking seat; 38. Guide rod; 39. Annular groove; 40. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] To make the objectives, technical solutions, and advantages of the present invention clear and complete, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of the present invention, and are merely illustrative of the embodiments of the present invention. They are not intended to limit the embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] In the description of this invention, it should be noted that the terms "center," "middle," "upper," "lower," "left," "right," "inner," "outer," "top," "bottom," "side," "vertical," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "a," "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] For purposes of simplicity and illustration, the principles of the embodiments are described primarily by way of example. In the following description, numerous specific details are set forth to provide a thorough understanding of the embodiments. However, it will be apparent to those skilled in the art that these embodiments may not be limited to these specific details in practice. In some instances, well-known methods and structures have not been described in detail to avoid unnecessarily obscuring these embodiments. Furthermore, all embodiments can be used in combination with each other.

[0034] Please see Figure 1-9 The present invention provides the following five preferred embodiments. Example 1

[0035] A uniform anti-eccentric injection mold includes a lower mold structure 1 and an upper grinding structure 2, which are symmetrically arranged. Mold grooves 15 are formed on the upper side of the lower mold structure 1 and the lower side of the upper grinding structure 2. The mold grooves 15 on the upper grinding structure 2 are connected to the feed pipe 3. Both the lower mold structure 1 and the upper grinding structure 2 include a primary mold body 4 and a secondary mold body 5. The primary mold body 4 has a primary main air intake chamber 6, a secondary main air intake chamber 7, a primary secondary air intake chamber 8, a secondary secondary air intake chamber 9, and a primary piston groove 10. The primary main air intake chamber 6 and the secondary main air intake chamber 7 are symmetrically arranged. The ports of the primary main air intake chamber 6 and the secondary main air intake chamber 7 are respectively formed with a primary air intake pipe connection port 16 and a secondary air intake pipe connection port 17. Multiple secondary air intake chambers 8 and 9 are evenly spaced. The intake chamber 8 is connected to the primary main intake chamber 6, and the secondary intake chamber 9 is connected to the secondary main intake chamber 7. The primary and secondary intake chambers 8 and 9 are arranged in a group. The primary piston groove 10 is located between the primary and secondary intake chambers 8 and 9 in the same group. The two ends of the primary piston groove 10 are connected to the primary and secondary intake chambers 8 and 9 respectively through the primary connecting chamber 11 and the secondary connecting chamber 12. A primary piston 18 is movably installed in the primary piston groove 10. A limit component mounting groove is opened on the side wall of the primary piston groove 10. A limit component 19 is installed in the limit component mounting groove. When the primary piston 18 moves to abut against the end face of the primary piston groove 10, the other side of the primary piston 18 is limited by the limit component 19. The secondary mold body 5 and the primary mold body 4 are symmetrically arranged, and the same groove structure is opened on both of them.

[0036] The primary mold body 4 has a threaded hole 13, and the secondary mold body 5 has a screw hole 14. The screw hole 14 is corresponding to the threaded hole 13. The screw hole 14, the threaded hole 13 and the slots on the primary mold body 4 and the secondary mold body 5 are all staggered. The primary mold body 4 and the secondary mold body 5 are positioned by positioning screws.

[0037] The primary air intake pipe connection port 16 is connected to the primary air supply equipment via the primary air intake pipe, and the secondary air intake pipe connection port 17 is connected to the secondary air supply equipment via the secondary air intake pipe. A primary pressure relief valve and a secondary pressure relief valve are respectively connected to the primary and secondary air intake pipes. A uniform anti-eccentric injection mold composed of a lower mold structure 1 and an upper grinding structure 2 is used. Both the lower mold structure 1 and the upper grinding structure 2 are composed of a primary mold body 4 and a secondary mold body 5. A primary main air intake chamber 6, a secondary main air intake chamber 7, a primary secondary air intake chamber 8, and a secondary secondary air intake chamber 9 are formed on the primary mold body 4. The system includes an intake chamber 9 and a first-stage piston groove 10, with a first-stage piston 18 movably mounted in the first-stage piston groove 10. Limiting components 19 are installed in the limiting slots on both sides of the first-stage piston groove 10, thereby limiting the first-stage piston 18. By continuously pressurizing the system through the air supply equipment, when the limiting components 19 are released, the first-stage piston 18 moves quickly to the other side of the first-stage piston groove 10 under pressure, thus creating an impact vibration effect. This allows the material in the mold groove 15 to be better evenly distributed, thereby effectively improving the molding effect of the injection molded part. Example 2

[0038] Based on Embodiment 1, the limiting component mounting groove is composed of a primary piston rod groove 20, a secondary piston groove 21, a secondary piston rod groove 22, and a stepped groove 23. The secondary piston groove 21 is connected to the primary piston 18 through the primary piston rod groove 20, and the secondary piston rod groove 22 is connected to the outer end of the secondary piston groove 21. The stepped groove 23 is opened at the bottom of the inner end of the secondary piston groove 21. The primary piston rod groove 20, the secondary piston rod groove 22, and the stepped groove 23 are coaxially arranged. The bottom of the stepped groove 23 is provided with a primary air inlet 24 and a secondary air inlet 27.

[0039] The limiting assembly 19 is composed of a piston rod 32, a secondary piston 33, a holding spring 34, and a push rod 35. The piston rod 32 and the secondary piston 33 are integrally formed, and a push rod groove is provided on the outer side of the piston rod 32. The holding spring 34 and the push rod 35 are both movably disposed in the push rod groove, and the push rod 35 is connected to the bottom of the push rod groove through the holding spring 34. The piston rod 32 is movably disposed in the primary piston rod groove 20 and the secondary piston rod groove 22, and the secondary piston 33 is movably disposed in the secondary piston groove 21. When the holding spring 34 is in the reset state, the end of its piston rod 32 is inserted into the primary piston groove 10, and at this time, the primary piston 18 is limited by the piston rod 32.

[0040] When the diameter of the stepped groove 23 is smaller than the diameter of the secondary piston groove 21, and the top holding spring 34 is in the reset state, the inner end face of the secondary piston 33 abuts against the port position of the stepped groove 23.

[0041] The end of the primary air intake port 24 is connected to a primary blocking groove 25, and the primary blocking groove 25 is connected to the primary connecting cavity 11 through a primary through hole 26. The end of the secondary air intake port 27 is connected to a secondary blocking groove 28, and the secondary blocking groove 28 is connected to the secondary connecting cavity 12 through a secondary through hole 29. A primary blocking component 30 and a secondary blocking component 31 are respectively provided in the primary blocking groove 25 and the secondary blocking groove 28. The limiting component mounting groove is configured to be composed of a primary piston rod groove 20, a secondary piston groove 21, a secondary piston rod groove 22 and a stepped groove 23. The limiting component 19 is configured to be composed of a piston rod 32, a secondary piston 33, a top holding spring 34 and a top rod 35. The system is constructed by combining a primary air inlet 24 and a secondary air inlet 27 at the bottom of the stepped groove 23. A primary blocking groove 25 and a secondary blocking groove 28 are respectively provided at the ends of the primary air inlet 24 and the secondary air inlet 27. The primary blocking groove 25 and the secondary blocking groove 28 are connected to the primary connecting cavity 11 and the secondary connecting cavity 12 through the primary through hole 26 and the secondary through hole 29, respectively. A primary blocking component 30 and a secondary blocking component 31 are respectively provided in the primary blocking groove 25 and the secondary blocking groove 28, so that the power source of the limiting component 19 and the power source of the primary piston 18 are shared, thereby effectively optimizing the power structure in the injection mold and effectively reducing the cost of use. Example 3

[0042] Based on Embodiment 2, both the primary blocking component 30 and the secondary blocking component 31 are composed of an annular plate 36, a support spring 37, and a blocking seat 38. The two ends of the support spring 37 are connected to the annular plate 36 and the blocking seat 38, respectively. The blocking seat 38 has a cylindrical structure, and its diameter is larger than that of the primary through hole 26 and smaller than that of the primary blocking groove 25. When the support spring 37 is in the reset state, its blocking seat 38 abuts against the bottom of the blocking groove. By setting up the blocking component composed of the annular plate 36, the support spring 37, and the blocking seat 38, the blocking seat 38 can automatically block, thereby effectively optimizing the overall power system of the structure. Example 4

[0043] Based on Embodiment 3, a guide rod 39 is integrally formed on the side wall of the blocking seat 38. The guide rod 39 is a cylindrical structure with a semi-circular cross-section, and the guide rod 39 is evenly arranged in a circle. When the blocking seat 38 is actually installed, its guide rod 39 is all close to the side wall of the blocking groove, reducing the resistance encountered when the blocking seat 38 moves. Example 5

[0044] Based on Embodiment 4, a set of limiting components 19 are symmetrically arranged, and are connected between the side walls of the stepped groove 23 on both sides of the limiting component mounting groove of the first-stage piston groove 10 through an annular groove 40. By applying force from both sides simultaneously, the stress stability of the first-stage piston 18 is ensured.

[0045] In actual use, when the primary gas supply equipment is started, its secondary pressure relief valve opens, allowing gas to flow into the primary piston groove 10 along the primary air inlet pipe, primary main air inlet chamber 6, primary secondary air inlet chamber 8, and primary connecting chamber 11. This causes the pressure on the primary piston 18 in this direction to continuously increase. The gas also flows into the stepped groove 23 through the primary through hole 26, primary blocking groove 25, and primary air inlet hole 24, causing the secondary piston 33 to be subjected to force, which in turn drives the piston rod 32 to move outward. When the primary piston 18 loses the blocking effect of the piston rod 32, it will collide with the other side, thereby generating mechanical vibration to make the material in the mold groove 15 more evenly distributed.

[0046] Although the illustrative specific embodiments of this application have been described above to enable those skilled in the art to understand this application, this application is not limited to the scope of the specific embodiments. For those skilled in the art, all applications utilizing the concept of this application are protected as long as various variations are within the spirit and scope of this application as defined and determined by the appended claims.

Claims

1. A uniform anti-eccentric injection mold, the uniform anti-eccentric injection mold comprising: The lower mold structure (1) and the upper grinding structure (2) are symmetrically arranged, and mold grooves (15) are provided on the upper side of the lower mold structure (1) and the lower side of the upper grinding structure (2). The mold grooves (15) on the upper grinding structure (2) are connected to the feed pipe (3). The lower mold structure (1) and the upper grinding structure (2) each include: A primary mold body (4) is provided with a primary main air intake chamber (6), a secondary main air intake chamber (7), a primary secondary air intake chamber (8), a secondary secondary air intake chamber (9), and a primary piston groove (10). The primary main air intake chamber (6) and the secondary main air intake chamber (7) are symmetrically arranged, and the ports of the primary main air intake chamber (6) and the secondary main air intake chamber (7) are respectively formed with a primary air intake pipe connection port (16) and a secondary air intake pipe connection port (17). The primary secondary air intake chamber (8) and the secondary secondary air intake chamber (9) are provided with multiple channels at equal intervals. The primary secondary air intake chamber (8) is connected to the primary main air intake chamber (6), and the secondary secondary air intake chamber (9) is connected to the secondary main air intake chamber (7). The primary and secondary intake chambers (9) are arranged in a group. The primary piston groove (10) is arranged between the primary and secondary intake chambers (8) and the secondary intake chambers (9) in the same group. The two ends of the primary piston groove (10) are connected to the primary and secondary intake chambers (8) and the secondary intake chambers (9) through the primary connecting chamber (11) and the secondary connecting chamber (12) respectively. A primary piston (18) is movably installed in the primary piston groove (10). A limit component mounting groove is opened on the side wall of the primary piston groove (10). A limit component (19) is installed in the limit component mounting groove. When the primary piston (18) moves to abut against the end face of the primary piston groove (10), the other side of the primary piston (18) is limited by the limit component (19). The secondary mold body (5) is symmetrically arranged with the primary mold body (4), and the same slot structure is opened on both of them. The limiting component mounting groove is composed of a first-stage piston rod groove (20), a second-stage piston groove (21), a second-stage piston rod groove (22), and a stepped groove (23). The second-stage piston groove (21) is connected to the first-stage piston (18) through the first-stage piston rod groove (20), and the second-stage piston rod groove (22) is connected to the outer end of the second-stage piston groove (21). The stepped groove (23) is opened at the bottom of the inner end of the second-stage piston groove (21). The first-stage piston rod groove (20), the second-stage piston rod groove (22), and the stepped groove (23) are coaxially arranged. The bottom of the stepped groove (23) is provided with a first-stage air inlet (24) and a second-stage air inlet (27). The limiting component (19) is composed of a piston rod (32), a secondary piston (33), a top holding spring (34), and a top rod (35). The piston rod (32) and the secondary piston (33) are integrally formed, and a top rod groove is provided on the outer side of the piston rod (32). The top holding spring (34) and the top rod (35) are both movably arranged in the top rod groove, and the top rod (35) is connected to the bottom of the top rod groove through the top holding spring (34). The piston rod (32) is movably arranged in the primary piston rod groove (20) and the secondary piston rod groove (22). The secondary piston (33) is movably arranged in the secondary piston groove (21). When the top holding spring (34) is in the reset state, the end of its piston rod (32) is inserted into the primary piston groove (10), and at this time, the primary piston (18) is limited by the piston rod (32).

2. The uniform anti-eccentricity injection mold according to claim 1, characterized in that: The first-stage mold body (4) is provided with a threaded hole (13), and the second-stage mold body (5) is provided with a screw hole (14). The screw hole (14) and the threaded hole (13) are provided in a corresponding manner. The screw hole (14), the threaded hole (13) and the slots on the first-stage mold body (4) and the second-stage mold body (5) are all staggered. The first-stage mold body (4) and the second-stage mold body (5) are positioned by positioning screws.

3. The uniform anti-eccentric injection mold according to claim 1, characterized in that: The primary air intake pipe connection port (16) is connected to the primary air supply equipment through the primary air intake pipe, and the secondary air intake pipe connection port (17) is connected to the secondary air supply equipment through the secondary air intake pipe. The primary air intake pipe and the secondary air intake pipe are respectively connected to a primary pressure relief valve and a secondary pressure relief valve.

4. The uniform anti-eccentricity injection mold according to claim 1, characterized in that: The diameter of the stepped groove (23) is smaller than the diameter of the secondary piston groove (21), and when the top holding spring (34) is in the reset state, the inner end face of its secondary piston (33) abuts against the port position of the stepped groove (23).

5. A uniform anti-eccentric injection mold according to claim 4, characterized in that: The end of the primary air inlet (24) is connected to a primary blocking groove (25), and the primary blocking groove (25) is connected to the primary connecting cavity (11) through a primary through hole (26). The end of the secondary air inlet (27) is connected to a secondary blocking groove (28), and the secondary blocking groove (28) is connected to the secondary connecting cavity (12) through a secondary through hole (29). A primary blocking component (30) and a secondary blocking component (31) are respectively provided in the primary blocking groove (25) and the secondary blocking groove (28).

6. A uniform anti-eccentric injection mold according to claim 5, characterized in that: The primary blocking component (30) and the secondary blocking component (31) are both composed of an annular plate (36), a support spring (37) and a blocking seat (38). The two ends of the support spring (37) are connected to the annular plate (36) and the blocking seat (38) respectively. The blocking seat (38) has a cylindrical structure. The diameter of the blocking seat (38) is greater than the diameter of the primary through hole (26) and less than the diameter of the primary blocking groove (25).

7. A uniform anti-eccentric injection mold according to claim 6, characterized in that: The blocking seat (38) has a guide rod (39) integrally formed on its side wall. The guide rod (39) is a cylindrical structure with a semi-circular cross section. The guide rod (39) is evenly arranged in a circle. When the blocking seat (38) is actually installed, its guide rod (39) is close to the side wall of the blocking groove.

8. A uniform anti-eccentric injection mold according to claim 7, characterized in that: The limiting components (19) are symmetrically arranged in a set, and are connected to the side walls of the stepped groove (23) on both sides of the limiting component mounting groove of the first-stage piston groove (10) through an annular groove (40).

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