Injection molding machine glue injection device, control method thereof and injection molding machine

Abstract

The invention relates to an injection molding machine glue injection device, a control method thereof and an injection molding machine, and belongs to the technical field of injection molding machine glue injection. The control method of the injection molding machine glue injection device comprises the steps that synchronization information of a front plate assembly is obtained, and whether a first hydraulic assembly and a second hydraulic assembly are synchronous or not is judged; when the synchronous operation mode is started in a differential mode, the first piston unit extends relative to the second first cylinder barrel, the second piston unit extends relative to the second cylinder barrel, and the threaded rod is driven to move in the D rear direction; or, the first piston unit retracts relative to the first cylinder barrel II, the second piston unit retracts relative to the second cylinder barrel II, and the screw rod is driven to move in the D front direction for glue injection; and in the differential closing synchronous operation mode, the first piston unit telescopically moves relative to the first cylinder barrel II, the second piston unit telescopically moves relative to the second cylinder barrel II, and the screw rod is driven to move in the direction D. According to the invention, the glue injection device of the injection molding machine can drive the threaded rod to inject glue.

Description

Technical Field

[0001] The present invention application relates to the technical field of injection molding machine injection technology, in particular to an injection device of an injection molding machine, its control method, and an injection molding machine. Background Art

[0002] In the field of injection molding machines, the injection process is one of the key links determining the quality and production efficiency of plastic products. With the rapid development of the plastic products industry, the performance requirements for injection molding machines are also increasing day by day, especially in terms of injection speed, accuracy, and stability.

[0003] Most traditional injection molding machine injection systems adopt simple hydraulic systems, and there are many deficiencies in the structural operation of the injection systems. First of all, the flow direction and pressure distribution of hydraulic oil are not reasonable enough, resulting in limited movement speed of the oil cylinder, and thus relatively slow injection speed during the injection process. The injection system cannot inject enough plastic melt into the mold within a short time, making it difficult to meet the high-efficiency requirements of modern production. For example, in large-scale production of plastic products, such as plastic toys and daily necessities, the slower injection speed will significantly extend the production cycle, reducing the production efficiency and market competitiveness of enterprises. Moreover, the injection accuracy of the traditional system is also poor, making it difficult to ensure the dimensional consistency of plastic products, which has become a serious problem in some fields with high requirements for product accuracy, such as the injection production of electronic and electrical components. In addition, due to the poor stability of its hydraulic system, during the injection process, fluctuations in pressure and flow rate will cause instability of the injection volume, resulting in problems such as dimensional deviation and surface defects of plastic products. For example, in the production of plastic shells for electronic devices, slight dimensional deviations may cause the shell not to perfectly match the internal components, affecting the overall performance of the product. In addition, the maintenance of traditional injection mechanisms is difficult, which is also an important factor restricting their development. The oil cylinders of traditional injection mechanisms are usually built inside the injection molding machine. When maintenance personnel conduct fault troubleshooting and component replacement, they need to remove a large number of other components first. The operation is complex and time-consuming, not only increasing the maintenance cost, but also extending the equipment downtime and affecting normal production. Moreover, the heat generated by the built-in oil cylinders during operation is difficult to dissipate effectively, easily causing the temperature of the hydraulic oil to rise, thereby affecting the performance and stability of the hydraulic system and increasing the failure rate of the equipment.

[0004] Therefore, the traditional injection molding machine injection system obviously has limitations, and these limitations have seriously affected the application and development of injection molding machines in modern plastic product production. How to partially or completely overcome the limitations of the existing traditional injection systems, achieve synchronous injection, reduce maintenance costs, and improve injection accuracy and stability has become an important technical problem that injection molding machine hydraulic cylinder manufacturers urgently need to solve. Summary of the Invention

[0005] The object of this invention application is to provide an injection device for an injection molding machine and its control method to partially or fully solve the technical problems of the existing injection system of injection molding machines. To achieve the above object, the following technical solutions are provided in this invention application:

[0006] In a first aspect, an injection device for an injection molding machine includes: a plasticizing assembly, a front plate assembly, and a rear plate assembly. The plasticizing assembly is connected to the front plate assembly, and the front plate assembly is connected to the rear plate assembly. The plasticizing assembly includes a barrel and a screw. The screw slides relative to the barrel. The front plate assembly includes a first hydraulic assembly, a second hydraulic assembly, and a connecting assembly. The connecting assembly connects the first hydraulic assembly and the second hydraulic assembly. The first hydraulic assembly includes a first hydraulic cylinder unit one, a first hydraulic cylinder unit two, and a first piston unit. The first hydraulic cylinder unit one is connected to the outside of the first hydraulic cylinder unit two. The first piston unit moves telescopically relative to the first hydraulic cylinder unit two. The second hydraulic assembly includes a second hydraulic cylinder unit one, a second hydraulic cylinder unit two, and a second piston unit. The second hydraulic cylinder unit one is connected to the outside of the second hydraulic cylinder unit two. The second piston unit moves telescopically relative to the second hydraulic cylinder unit two. The first piston unit and the second piston unit are connected to the rear plate assembly, and the screw is connected to the rear plate assembly.

[0007] Optionally, the first hydraulic cylinder unit one includes a first cylinder barrel one and a first flange. The first cylinder barrel one is connected to the first flange. The first hydraulic cylinder unit two includes a first end cover one, a first cylinder barrel two, a first end cover two, and a first gland. One side of the first end cover one is connected to the first flange, the other side of the first end cover one is connected to the first cylinder barrel two. The first cylinder barrel two is connected to the first end cover two, and the first end cover two is connected to the first gland. The first piston unit includes a first piston, a first piston mounting member, and a first piston rod. The first piston rod includes a first piston rod one, a first piston rod two, and a first piston rod three. One side of the first piston rod two is connected to the first piston rod one, and the other side of the first piston rod two is connected to the first piston rod three. The first piston mounting member is mounted on the first piston rod two, and the first piston mounting member is connected to the first piston. The first piston rod moves telescopically relative to the first cylinder barrel one and relative to the first cylinder barrel two. The first piston moves along the D direction in the first cylinder barrel two.

[0008] Optionally, the second hydraulic cylinder unit 1 includes a second cylinder barrel 1 and a second flange. The second cylinder barrel 1 is connected to the second flange. The second hydraulic cylinder unit 2 includes a second end cover 1, a second cylinder barrel 2, a second end cover 2, and a second gland. One side of the second end cover 1 is connected to the second flange, the other side of the second end cover 1 is connected to the second cylinder barrel 2, the second cylinder barrel 2 is connected to the second end cover 2, and the second end cover 2 is connected to the second gland. The second piston unit includes a second piston, a second piston mounting member, and a second piston rod. The second piston rod includes a second piston rod 1, a second piston rod 2, and a second piston rod 3. One side of the second piston rod 2 is connected to the second piston rod 1, and the other side of the second piston rod 2 is connected to the second piston rod 3. The second piston mounting member is mounted on the second piston rod 2, and the second piston mounting member is connected to the second piston. The second piston rod moves telescopically relative to the second cylinder barrel 1 and relative to the second cylinder barrel 2. The second piston moves along the D direction in the second cylinder barrel 2.

[0009] Optionally, the first end cover 1 is provided with a first through hole 1, a first through hole 2, a first oil hole 1, and a first oil hole 2. A first oil hole 3 is provided on the first end cover 2; the second end cover 1 is provided with a second through hole 1, a second through hole 2, and a second through hole. A second oil hole 3 is provided on the second end cover 2. The first oil hole 3 is connected to the second oil hole 3, and the first oil hole 2 is connected to the second oil hole.

[0010] Optionally, the injection device of the injection molding machine includes a differential opening synchronous operation mode and a differential closing synchronous operation mode. In the differential opening synchronous operation mode, the first piston unit extends relative to the second cylinder barrel 2, and the second piston unit extends relative to the second cylinder barrel 2, driving the threaded rod to move along the D rear direction; or, the first piston unit retracts relative to the second cylinder barrel 2, and the second piston unit retracts relative to the second cylinder barrel 2, thereby driving the screw to move along the D front direction for injection; in the differential closing synchronous operation mode, the first piston unit moves telescopically relative to the second cylinder barrel 2, and the second piston unit moves telescopically relative to the second cylinder barrel 2, driving the screw to move along the D direction.

[0011] Optionally, the front plate assembly further includes: a first adjustment and locking assembly and a second adjustment and locking assembly. The first adjustment and locking assembly includes a first limiting member and a first locking member. The first limiting member moves on the first piston rod, and the first locking member is connected to the first limiting member to connect and fix the first limiting member. The second adjustment and locking assembly includes a second limiting member and a second locking member. The second limiting member moves on the second piston rod, and the second locking member is connected to the second limiting member to connect and fix the second limiting member.

[0012] Optionally, the front panel assembly further includes: a first adjustment assembly, a second adjustment assembly, a first distance sensor, and a second distance sensor. The first distance sensor is installed on the first gland, and the second distance sensor is installed on the second gland. The first distance sensor measures the distance between the first gland and the first limiting member, and the second distance sensor measures the distance between the second gland and the second limiting member. The first adjustment assembly includes a first cylinder and a first limiting member. The first cylinder is connected to the first limiting member, and the first limiting member is slidably engaged with the first piston rod. The second adjustment assembly includes a second cylinder and a second limiting member. The second cylinder is connected to the second limiting member, and the second limiting member is slidably engaged with the second piston rod. The first cylinder and the second cylinder are both connected to the rear panel assembly.

[0013] In a second aspect, the present invention provides a control method for an injection device of an optical injection molding machine, using any one of the injection devices of an injection molding machine in the first aspect as described above, including:

[0014] Step S100: Obtain the synchronization information of the front panel assembly, and determine whether the first hydraulic assembly and the second hydraulic assembly are synchronized. If so, proceed to step S200; if not, proceed to step S300;

[0015] Step S200: When in the differential opening synchronous operation mode, the first piston unit extends relative to the first cylinder two, and the second piston unit extends relative to the second cylinder two, driving the threaded rod to move along the D rear direction; or, the first piston unit retracts relative to the first cylinder two, and the second piston unit retracts relative to the second cylinder two, thereby driving the screw to move along the D front direction for injection; when in the differential closing synchronous operation mode, the first piston unit expands and contracts relative to the first cylinder two, and the second piston unit expands and contracts relative to the second cylinder two, driving the screw to move along the D direction.

[0016] Optionally, step S200 includes:

[0017] Step S201: When in the differential opening synchronous operation mode, the first piston unit extends relative to the first cylinder two, and the second piston unit extends relative to the second cylinder two, driving the threaded rod to move along the D rear direction; or, the first piston unit retracts relative to the first cylinder two, and the second piston unit retracts relative to the second cylinder two, thereby driving the screw to move along the D front direction for injection, and the injection speed is the first speed;

[0018] Step S202: When in the differential closing synchronous operation mode, the first piston unit expands and contracts relative to the first cylinder two, and the second piston unit expands and contracts relative to the second cylinder two, driving the screw to move along the D direction, and the injection speed is the second speed;

[0019] Steps S201 and S202 can be switched with each other, and the first speed is greater than the second speed.

[0020] In a third aspect, an injection molding machine employs an injection molding machine injection device described in any one of the above first aspects or a control method for an injection molding machine injection device described in any one of the above second aspects.

[0021] In summary, the present invention application has the following beneficial technical effects:

[0022] (1) In the present invention application, first, the first piston unit and the second piston unit are connected to the rear plate assembly, and the screw rod is also connected to the rear plate assembly. By controlling the synchronous telescopic movement of the first piston unit and the second piston unit, precise adjustment of the position of the screw rod can be achieved, thereby meeting the requirements for pressure, speed, and injection volume during the injection molding process, ensuring that the melt is injected into the mold cavity at a reasonable speed and pressure, and improving the dimensional consistency and quality of plastic products. Additionally, different plastic products have different requirements for injection speed, pressure, and injection volume. By precisely controlling the position and movement speed of the screw rod, the injection parameters can be flexibly adjusted, adapting to the needs of various complex molding processes, enhancing the flexibility and adaptability of injection molding production, and meeting the production requirements of multi-scenario injection molded products.

[0023] (2) In the present invention application, in the differential opening synchronous operation mode, the retraction movement of the first piston unit and the second piston unit can be accelerated, the speed of the screw rod injection process is increased, the working time of the screw rod injection process is shortened, the production efficiency of the injection molding machine is improved, and the injection molding process cycle is reduced; in the differential closing synchronous operation mode, the first piston unit and the second piston unit synchronously expand and contract, causing the screw rod to move along the D direction, balancing the pressure during the injection process, ensuring that the melt is injected into the mold at a stable speed. The differential opening synchronous operation mode and the differential closing synchronous operation mode can be interchanged, perfectly balancing the flexibility and reliability of the working scenarios of the injection molding machine, significantly improving the quality and adaptability of injection molded products, and meeting the production requirements of different scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of an injection molding machine injection device of the present invention application Figure 1 ;

[0025] Figure 2 is a schematic structural diagram of an injection molding machine injection device of the present invention application Figure 2 ;

[0026] Figure 3 is a schematic structural diagram of the plasticizing assembly of the present invention application;

[0027] Figure 4 is a schematic structural diagram of the front plate assembly of the present invention application Figure 1 ;

[0028] Figure 5 It is a schematic diagram of the structure of the front panel assembly of the present invention application Figure 2 ;

[0029] Figure 6 It is a schematic diagram of the structure of the front panel assembly of the present invention application Figure 3 ;

[0030] Figure 7 It is a schematic diagram of the structure of the first hydraulic component of the present invention application;

[0031] Figure 8 It is a schematic diagram of the structure of the second hydraulic component of the present invention application;

[0032] Figure 9 It is a schematic diagram of the hydraulic circuit of the injection device of the injection molding machine of the present invention application;

[0033] Figure 10 It is a schematic diagram of the structure of the rear panel assembly of the present invention application Figure 1 ;

[0034] Figure 11 It is a schematic diagram of the structure of the rear panel assembly of the present invention application Figure 2 ;

[0035] Figure 12 It is a schematic diagram of the structure of the rear panel assembly of the present invention application Figure 3 (Section view taken along line J-J). Detailed implementation manners

[0036] In the following description, a large number of specific details are given to provide a more thorough understanding of the present invention application. However, it is obvious to those skilled in the art that the present invention application can be implemented without one or more of these details. In other examples, some technical features well known to the art are not described to avoid confusion with the present invention application.

[0037] In a first aspect, an injection device of an injection molding machine includes: a plasticizing assembly 100, a front plate assembly 200, and a rear plate assembly 300. The plasticizing assembly 100 is connected to the front plate assembly 200, and the front plate assembly 200 is connected to the rear plate assembly 300. The plasticizing assembly 100 includes a barrel 101 and a screw 102. The screw 102 slides relative to the barrel 101. The front plate assembly 200 includes a first hydraulic assembly 201, a second hydraulic assembly 202, and a connecting assembly 203. The connecting assembly 203 connects the first hydraulic assembly 201 and the second hydraulic assembly 202. The first hydraulic assembly 201 includes a first hydraulic cylinder unit one, a first hydraulic cylinder unit two, and a first piston unit. The first hydraulic cylinder unit one is connected to the outside of the first hydraulic cylinder unit two. The first piston unit moves telescopically relative to the first hydraulic cylinder unit two. The second hydraulic assembly 202 includes a second hydraulic cylinder unit one, a second hydraulic cylinder unit two, and a second piston unit. The second hydraulic cylinder unit one is connected to the outside of the second hydraulic cylinder unit two. The second piston unit moves telescopically relative to the second hydraulic cylinder unit two. The first piston unit and the second piston unit are connected to the rear plate assembly 300, and the screw 102 is connected to the rear plate assembly 300.

[0038] In some embodiments, in the injection molding machine, the plastic raw material is melted and plasticized to obtain a melt after being subjected to the helical shear friction heat of the screw 102 and the heating of the heating mechanism of the barrel 101. As the screw 102 rotates further, the melt is continuously pushed forward to the front part of the barrel 101. When the melt accumulates to a certain amount, the screw 102 stops rotating. Due to the connection of the first piston unit and the second piston unit to the rear plate assembly 300 and the connection of the screw 102 to the rear plate assembly 300, under the action of the first piston unit and the second piston unit of the injection device of the injection molding machine, the screw 102 is driven to move along the D direction. The screw 102 pushes the melt forward at a high speed with a strong thrust. The melt moving at a high speed passes through the nozzle and is precisely injected into the closed mold cavity. Thus, the injection process is successfully achieved. Subsequently, in the injection mold cavity, the melt cools and solidifies as the heat gradually dissipates, and finally solidifies into the shape of a plastic product that meets the design requirements. The ejector mechanism is used to smoothly eject the plastic product, and thus the injection molding machine completes the molding of a plastic product.

[0039] In some embodiments, the first hydraulic component 201 includes a first hydraulic cylinder unit one, a second hydraulic cylinder unit two, and a first piston unit. The first hydraulic cylinder unit one is connected to the outside of the second hydraulic cylinder unit two, and the first piston unit moves telescopically relative to the second hydraulic cylinder unit two; the second hydraulic component 202 includes a first hydraulic cylinder unit one, a second hydraulic cylinder unit two, and a second piston unit. The first hydraulic cylinder unit one is connected to the outside of the second hydraulic cylinder unit two, and the second piston unit moves telescopically relative to the second hydraulic cylinder unit two. Thus, the first hydraulic cylinder unit one is connected to the outside of the second hydraulic cylinder unit two, and the first hydraulic cylinder unit one is connected to the outside of the second hydraulic cylinder unit two. The first hydraulic component 201 can form an external differential connection method, etc. The second hydraulic component 202 can form an external differential connection method, etc. The design of the external differential connection method can make the maintenance of the first hydraulic component 201 and the second hydraulic component 202 more convenient, improve the interchangeability of the first hydraulic component 201 and the second hydraulic component 202, reduce the need to disassemble the components of the first hydraulic component 201 and the second hydraulic component 202, reduce the maintenance difficulty and cost of the injection device of the injection molding machine, shorten the downtime of the injection device of the injection molding machine, and improve the production efficiency of plastic products.

[0040] In some embodiments, first, the first piston unit and the second piston unit are connected to the rear plate assembly 300, and the screw rod 102 is also connected to the rear plate assembly 300. By controlling the synchronous telescopic movement of the first piston unit and the second piston unit, precise adjustment of the position of the screw rod 102 can be achieved, so as to meet the requirements for pressure, speed, and injection volume during the injection molding process, ensure that the melt is injected into the mold cavity at a reasonable speed and pressure, and improve the dimensional consistency and quality of plastic products; in addition, different plastic products have different requirements for injection speed, pressure, and injection volume. By precisely controlling the position and movement speed of the screw rod, the injection parameters can be flexibly adjusted, which can adapt to the needs of various complex molding processes, improve the flexibility and adaptability of injection molding production, and meet the production needs of multi-scene injection molding products.

[0041] Optionally, the first hydraulic cylinder unit one includes a first cylinder barrel one 2011 and a first flange 2012. The first cylinder barrel one 2011 is connected to the first flange 2012. The first hydraulic cylinder unit two includes a first end cap one 2013, a first cylinder barrel two 2014, a first end cap two 2015, and a first gland 2016. One side of the first end cap one 2013 is connected to the first flange 2012, and the other side of the first end cap one 2013 is connected to the first cylinder barrel two 2014. The first cylinder barrel two 2014 is connected to the first end cap two 2015, and the first end cap two 2015 is connected to the first gland 2016. The first piston unit includes a first piston 20181, a first piston mounting member 20182, and a first piston rod. The first piston rod includes a first piston rod one 20171, a first piston rod two 20172, and a first piston rod three 20173. One side of the first piston rod two 20172 is connected to the first piston rod one 20171, and the other side of the first piston rod two 20172 is connected to the first piston rod three 20173. The first piston mounting member 20182 is mounted on the first piston rod two 20172, and the first piston mounting member 20182 is connected to the first piston 20181. The first piston rod moves telescopically relative to the first cylinder barrel one 2011 and relative to the first cylinder barrel two 2014. The first piston 20181 moves along the D direction in the first cylinder barrel two 2014.

[0042] In some embodiments, one side of the first end cap one 2013 is connected to the first flange 2012, and the other side of the first end cap one 2013 is connected to the first cylinder barrel two 2014. Both of the above connection methods can adopt a fastening connection method, such as a threaded connection method, which can be achieved by rotating and tightening bolts. The fastening connection method has good sealing performance and connection strength. The connection between the first cylinder barrel two 2014 and the first end cap two 2015, and the connection between the first end cap two 2015 and the first gland 2016 can also adopt a threaded fastening connection method, which can facilitate the disassembly and replacement of internal and external components.

[0043] In some embodiments, after the first piston rod one 20171 and the first piston rod two 20172 are connected, a first step one is formed. After the first piston rod two 20172 and the first piston rod three 20173 are connected, a first step two is formed. The first piston mounting member 20182 is mounted on the first piston rod two 20172. A bolt connection can be adopted between the first piston mounting member 20182 and the first piston 20181, which is convenient for installation and disassembly. The first piston rod can move telescopically relative to the first cylinder one 2011, and the first piston rod can also move telescopically relative to the first cylinder two 2014. Corresponding guiding members and / or sealing members can be provided in the first cylinder one 2011 and the first cylinder two 2014 to ensure that there is no leakage and jamming phenomenon during the telescopic process of the first piston rod. The first piston 20181 moves along the D direction inside the first cylinder two 2014. The smoothness and precision of the inner wall of the first cylinder two 2014 ensure the smoothness and sealing performance of the movement of the first piston 20181.

[0044] Optionally, the second hydraulic cylinder unit one includes a second cylinder one 2021 and a second flange 2022. The second cylinder one 2021 is connected to the second flange 2022. The second hydraulic cylinder unit two includes a second end cover one 2023, a second cylinder two 2024, a second end cover two 2025, and a second gland 2026. One side of the second end cover one 2023 is connected to the second flange 2022, and the other side of the second end cover one 2023 is connected to the second cylinder two 2024. The second cylinder two 2024 is connected to the second end cover two 2025, and the second end cover two 2025 is connected to the second gland 2026. The second piston unit includes a second piston 20281, a second piston mounting member 20282, and a second piston rod. The second piston rod includes a second piston rod one 20271, a second piston rod two 20272, and a second piston rod three 20273. One side of the second piston rod two 20272 is connected to the second piston rod one 20271, and the other side of the second piston rod two 20272 is connected to the second piston rod three 20273. The second piston mounting member 20282 is mounted on the second piston rod two 20272. The second piston mounting member 20282 is connected to the second piston 20281. The second piston rod moves telescopically relative to the second cylinder one 2021 and telescopically relative to the second cylinder two 2024. The second piston 20281 moves along the D direction inside the second cylinder two 2024.

[0045] In some embodiments, one side of the first end cap 2023 is connected to the second flange 2022, and the other side of the first end cap 2023 is connected to the second cylinder 2024. The above connection methods can all adopt fastening connection methods, such as threaded connection methods, which can be achieved by rotating and tightening bolts. The fastening connection method has good sealing performance and connection strength. The connection between the second cylinder 2024 and the second end cap 2025, and the connection between the second end cap 2025 and the second gland 2026 can also adopt threaded fastening connection methods, which can facilitate the disassembly and replacement of internal and external components.

[0046] In some embodiments, after the first second piston rod 20271 and the second second piston rod 20272 are connected, a first step is formed. After the second second piston rod 20172 and the third second piston rod 20273 are connected, a second step is formed. The second piston mounting member 20282 is mounted on the second second piston rod 20272. A bolt connection can be adopted between the second piston mounting member 20282 and the second piston 20281, which is convenient for installation and disassembly. The second piston rod can move telescopically relative to the first cylinder 2021, and the second piston rod can also move telescopically relative to the second cylinder 2024. Corresponding guiding members and / or sealing members can be provided in the first cylinder 2011 and the second cylinder 2024 to ensure that there is no leakage and jamming phenomenon during the telescopic process of the second piston rod. The second piston 20281 moves along the D direction in the second cylinder 2024. The smoothness and precision of the inner wall of the second cylinder 2024 ensure the smoothness and sealing performance of the movement of the second piston 20281.

[0047] Optionally, the first end cap 2013 is provided with a first through hole 20131, a second through hole 20132, a first oil hole 20133, and a second oil hole 20134, and a third oil hole 20151 is provided on the second end cap 2015; the first end cap 2023 is provided with a first through hole 20231, a second through hole 20232, and a second through hole 20233, and a third oil hole 20251 is provided on the second end cap 2025. The third oil hole 20151 is connected to the third oil hole 20251, and the second oil hole 20134 is connected to the second through hole 20233.

[0048] In some embodiments, during the movement of the first piston and the second piston, the first through hole 20131 and the second through hole 20132 are used to discharge the gas in the second cylinder 2, and the first through hole 20231 and the second through hole 20232 are used to discharge the gas in the second cylinder 2.

[0049] In some embodiments, a first oil hole 1-20133 and a second oil hole 1-20134 are provided on the first end cap 1-2013, and a third oil hole 1-20151 is provided on the second end cap 1-2015; a second oil hole 20233 and a third oil hole 1-20151 are provided on the second end cap 1-2015. The third oil hole 1-20151 is connected to the third oil hole 20251, the second oil hole 1-20134 is connected to the second oil hole 20233, and the first oil hole 1-20133 can be used for injecting or discharging hydraulic oil. The injection of hydraulic oil can push the first piston 20181 to drive the first piston rod and the second piston 20281 to drive the second piston rod to extend and move in the D-back direction (i.e., the D- direction), and the discharge of hydraulic oil can synchronously push the second piston 20281 to drive the first piston 20181 to drive the first piston rod and the second piston rod to retract and move in the D-forward direction (i.e., the D+ direction). The D direction can include the D-back direction and the D-forward direction, and the D direction can be a horizontal direction.

[0050] In some embodiments, the injection device of the injection molding machine includes a plurality of hydraulic pumps. The plurality of (e.g., 3 or 4) hydraulic pumps are connected to the first hydraulic component 201 and the second hydraulic component 202, and all of the plurality of hydraulic pumps can provide power for injecting or discharging hydraulic oil. The plurality of hydraulic pumps can transport hydraulic oil into the first hydraulic component 201 and the second hydraulic component 202. After the hydraulic oil enters the first hydraulic component 201, it pushes the first piston and the first piston rod of the first piston unit to move. At the same time, the hydraulic oil is also transported to the second hydraulic component 202 to drive the second piston and the second piston rod of the second piston unit to move. Working in cooperation with the first hydraulic component 201, the first hydraulic component 201 and the second hydraulic component 201 can work synchronously, that is, the first piston and the first piston rod, the second piston and the second piston rod can synchronously expand and contract, thereby driving the screw to move along the D direction.

[0051] Optionally, the connecting component 203 includes a connecting portion 2033, a first connecting block 2031, and a second connecting block 2032. The connecting portion 2033 is formed with a through hole, and the threaded rod 102 passes through the through hole. The first connecting block 2031 and the second connecting block 2032 are connected below the connecting portion 2033, and the first connecting block 2031 and the second connecting block 2032 are connected to the machine table of the injection molding machine.

[0052] In some embodiments, the connecting portion 2033 can be integrally formed with the first cylinder 2-2014 and the second cylinder 2-2024. The first connecting block 2031 and the second connecting block 2032 are connected below the connecting portion 2033. The first connecting block 2031 and the second connecting block 2032 can be connected to the machine table of the injection molding machine. The connecting portion 2033 is formed with a through hole, and the threaded rod 102 passes through the through hole. The connecting portion 2033 can provide stable support and guidance to ensure the linear movement of the threaded rod 102, thereby ensuring the stability of the pressure and speed during the injection process and improving the dimensional consistency and quality of plastic products.

[0053] Optionally, the rear plate assembly 300 includes a first gland 301, a second gland 302, an end cap 303, a main body 304, a transmission shaft 305, a bearing assembly, and an oil motor 307. The bearing assembly includes a first bearing 3061, a second bearing 3062, and a third bearing 3063. The first bearing 3061, the second bearing 3062, and the third bearing 3063 are arranged in sequence along the D direction. The first gland 301 is connected to the transmission shaft 305, the second gland 302 is connected to the end cap 303, the end cap 303 is connected to the main body 304, the main body is connected to the oil motor 307, the first bearing 3061 is installed on the transmission shaft 305, the second bearing 3062 is installed on the transmission shaft 305, the third bearing 3063 is installed on the transmission shaft 305. The main body 304 includes a main body portion 3041, a first sliding portion 3042, a second sliding portion 3043, a first through hole 3044, and a second through hole 3045. The first sliding portion 3042 and the second sliding portion 3043 are both in sliding fit with the injection molding machine table. The first piston rod three 20173 passes through the first through hole 3044 to connect to the main body 304, and the second piston rod three 20273 passes through the second through hole 3045 to connect to the main body 304.

[0054] In some embodiments, first, the first bearing 3061 is a roller bearing, the second bearing 3062 is a roller bearing, and the third bearing 3063 is a ball bearing. The first bearing 3061 and the second bearing 3062 being roller bearings can withstand large radial loads. The roller bearings increase the support stiffness and ensure the straightness of the shaft, being suitable for high-load working conditions. The third bearing 3063 is a ball bearing, suitable for bearing combined radial and axial loads. The ball bearing provides flexible axial displacement compensation ability, reduces the accumulation of bearing internal stress, and extends the service life. The first bearing 3061, the second bearing 3062, and the third bearing 3063 are arranged in sequence along the D direction, forming a multi-point support structure. The multi-point supported bearing design effectively reduces vibration and offset, improves the stability and rigidity of the transmission shaft 305, and enhances the equipment accuracy and reliability. Additionally, the first gland 301 is connected to the transmission shaft 305, and the second gland 302 is connected to the end cap 303, providing positioning and sealing functions to protect the bearing assembly and the transmission shaft from external contamination (such as dust, oil, etc.). The first piston rod three 20173 passes through the first through hole 3044 to connect to the main body 304, the second piston rod three 20273 passes through the second through hole 3045 to connect to the main body 304. The direct connection between the main body 304 and the oil motor 307 transmits the rotational power of the oil motor 307 to the transmission shaft 305, and the transmission shaft 305 drives the screw rod 102 to rotate, facilitating separate replacement and maintenance, and reducing maintenance costs and downtime.

[0055] Optionally, the injection device of the injection molding machine includes a differential opening synchronous operation mode and a differential closing synchronous operation mode. In the differential opening synchronous operation mode, the first piston unit extends relative to the second first cylinder, and the second piston unit extends relative to the second second cylinder, driving the threaded rod 102 to move along the D-back direction; or, the first piston unit retracts relative to the second first cylinder, and the second piston unit retracts relative to the second second cylinder, thereby driving the screw to move along the D-front direction for injection; in the differential closing synchronous operation mode, the first piston unit expands and contracts relative to the second first cylinder, and the second piston unit expands and contracts relative to the second second cylinder, driving the screw to move along the D direction.

[0056] In some embodiments, in the differential opening synchronous operation mode, the first piston unit extends relative to the second first cylinder, and the second piston unit extends relative to the second second cylinder, driving the threaded rod 102 to move along the D-back direction; or, the first piston unit retracts relative to the second first cylinder, and the second piston unit retracts relative to the second second cylinder, thereby driving the screw to move along the D-front direction for injection, specifically including:

[0057] When the first oil hole 20133 of the first hydraulic component is filled with oil and at the same time the second oil hole 2033 of the second hydraulic component is filled with oil, it pushes the first piston unit to extend relative to the second first cylinder and the second piston unit to extend relative to the second second cylinder. The first oil hole 20151 of the first hydraulic component discharges oil, and at the same time the second oil hole 20251 of the second hydraulic component discharges oil, driving the threaded rod 102 to move along the D-back direction; or, when the first oil hole 20133 of the first hydraulic component returns oil and at the same time the second oil hole 2033 of the second hydraulic component returns oil, the oil returning from the first oil hole 20133 enters the first oil hole 20151. The first oil hole 20151 of the first hydraulic component is filled with oil, and at the same time the second oil hole 20251 of the second hydraulic component is filled with oil. The first piston unit retracts relative to the second first cylinder, and the second piston unit retracts relative to the second second cylinder, thereby driving the screw 402 to move along the D-front direction, and further driving the screw to move along the D-front direction for injection, and the injection speed is the first speed.

[0058] In some embodiments, in the differential closing synchronous operation mode, the first piston unit expands and contracts relative to the second first cylinder, and the second piston unit expands and contracts relative to the second second cylinder, driving the screw to move along the D direction, specifically including:

[0059] When the first oil hole 20133 of the first hydraulic component admits oil and at the same time the second oil hole 2033 of the second hydraulic component admits oil, it pushes the first piston unit to elongate relative to the first cylinder 2, and the second piston unit to elongate relative to the second cylinder 2. The third oil hole 20151 of the first hydraulic component discharges oil, and at the same time the third oil hole 20251 of the second hydraulic component discharges oil, driving the threaded rod 102 to move along the D-back direction; when the first oil hole 20133 of the first hydraulic component returns oil and at the same time the second oil hole 2033 of the second hydraulic component returns oil, the third oil hole 20151 of the first hydraulic component admits oil, and at the same time the third oil hole 20251 of the second hydraulic component admits oil. The first piston unit retracts relative to the first cylinder 2, and the second piston unit retracts relative to the second cylinder 2, thereby driving the screw rod 402 to move along the D-forward direction, and further driving the screw rod to move along the D-forward direction for injection molding, and the injection molding speed is the second speed.

[0060] In the present invention application, the first speed is greater than the second speed. That is, in the differential opening operation mode, it can accelerate the retraction movement of the first piston unit and the second piston unit, speed up the speed of the threaded rod injection molding process, shorten the working time of the threaded rod injection molding process, improve the production efficiency of the injection molding machine, and reduce the injection molding process cycle; in the differential closing synchronous operation mode, the first piston unit and the second piston unit expand and contract synchronously, causing the threaded rod to move along the D direction, balancing the pressure during the injection molding process, ensuring that the melt is injected into the mold at a stable speed. The differential opening synchronous operation mode and the differential closing synchronous operation mode can be interchanged, perfectly taking into account the flexibility and reliability of the injection molding machine working scenario, significantly improving the quality and adaptability of the injection molded product, and meeting the production requirements of different scenarios.

[0061] However, in the present invention application, in the differential opening synchronous operation mode and the differential closing synchronous operation mode, the first piston rod 2017 expands and contracts along the D direction, and the second piston rod 2027 expands and contracts along the D direction. The synchronous movement of the first piston rod 2017 and the second piston rod 2027 is required. In the actual process, when the injection molding device of the injection molding machine is initially debugged or after long-term operation, the applicant found that the synchronous movement of the first piston rod 2017 and the second piston rod 2027 is not ideal, which will cause the threaded rod 102 to move slightly by the other piston rod after one piston rod stops, affecting the threaded injection molding and the hydraulic component work of the front plate assembly. Therefore, how to completely solve the synchronous movement of the first piston rod 2017 and the second piston rod 2027 to drive the threaded rod to complete the threaded rod injection molding process becomes very important, and the applicant proposed corresponding solution technologies.

[0062] Optionally, the front panel assembly 200 further includes: a first adjustment and locking assembly 2019 and a second adjustment and locking assembly 2029. The first adjustment and locking assembly includes a first limiting member 20191 and a first locking member 20192. The first limiting member 20191 moves on the first piston rod 2017, and the first locking member 20192 connects the first limiting member 20191 and the first piston rod to fixedly connect the first limiting member 20191. The second adjustment and locking assembly includes a second limiting member 20291 and a second locking member 20292. The second limiting member 20291 moves on the second piston rod 2027, and the second locking member 20292 connects the second limiting member 20291 and the second piston rod to fixedly connect the second limiting member 20291. The front panel assembly 200 includes a first synchronization coefficient S1, a second synchronization coefficient S2, and a synchronization coefficient S. The first synchronization coefficient S1, the second synchronization coefficient S2, and the synchronization coefficient S are respectively:

[0063] S1 = (L1 - L2) / L1

[0064] S2 = (L1 - L2) / L2

[0065] S = S1 - S2

[0066] Wherein, L1 is the distance between the first limiting member 20191 and the first gland 2016 when the first piston rod stops moving along the D-back direction (i.e., the D- direction); L2 is the distance between the second limiting member 20291 and the second gland 2026 when the second piston rod stops moving along the D-back direction (i.e., the D- direction).

[0067] In some embodiments, when the first piston rod moves along the D-back direction (i.e., the D- direction), when the first piston rod stops moving, the first piston abuts against and contacts the second end cap, that is, the second end cap limits the first piston and thus prevents the movement of the first piston rod, so that the first piston rod stops moving. Correspondingly, when the first piston rod moves along the D-back direction and stops moving, the distance between the first limiting member 20191 and the first gland 2016 is L1. When the first piston rod moves along the D-front direction and stops moving, the first limiting member abuts against and contacts the first gland. Correspondingly, the first synchronization coefficient S1 can be derived from the difference between L1 and L2, which correspondingly controls the difference in the movement stroke of the first piston rod and the movement stroke of the second piston rod. By adjusting the assembly distance between the first limiting member and the first gland to a reasonable distance, the magnitude of the first synchronization coefficient S1 can be adjusted, so that the stroke of the first piston rod can be reasonably controlled, and the operation synchronization and stability of the first hydraulic assembly can be improved; at the same time, the design of the first synchronization coefficient S1 can also keep the relative position between the first limiting member and the first gland within an ideal range, avoiding deviations caused by errors during assembly, thereby improving the overall assembly accuracy of the first hydraulic assembly and reducing assembly errors.

[0068] In some embodiments, when the second piston rod moves along the D-back direction (i.e., the D- direction), when the movement of the second piston rod stops, the second piston presses against and contacts the second end cover two, that is, the second end cover two limits the second piston and thus prevents the movement of the second piston rod, causing the second piston rod to stop moving. Correspondingly, when the second piston rod moves along the D-forward direction, when the movement of the second piston rod stops, the distance between the second limiting member 20191 and the second gland 2016 is L2. When the second piston rod moves along the D-forward direction, when the movement of the second piston rod stops, the second limiting member presses against and contacts the second gland. Correspondingly, the second synchronization coefficient S2 can be derived from the difference between L1 and L2, which correspondingly controls the difference in the movement strokes of the first piston rod and the second piston rod. By adjusting the assembly distance between the second limiting member and the second gland to a reasonable distance, the magnitude of the second synchronization coefficient S1 can be adjusted, enabling reasonable control of the stroke of the second piston rod, improving the running synchronization and stability of the second hydraulic component; at the same time, the design of the second synchronization coefficient S2 can also keep the relative position of the second limiting member and the second gland within an ideal range, avoiding deviations caused by errors during assembly, thereby improving the overall assembly accuracy of the second hydraulic component and reducing assembly errors.

[0069] In some embodiments, the first synchronization coefficient S1 and the second synchronization coefficient S2 can be comprehensively set as the synchronization coefficient S as a whole. The first synchronization coefficient S1, the second synchronization coefficient S2, and the synchronization coefficient S can be used during the initial commissioning of the injection molding machine or during maintenance after the injection molding machine has been working for a long time. After the first synchronization coefficient S1, the second synchronization coefficient S2, and the synchronization coefficient S are set, by adjusting the distance between the first limiting member and the first gland, and the distance between the second limiting member and the second gland, the overall synchronization of the first piston rod and the second piston rod can be improved, avoiding the inconsistency in the movement strokes of the first piston rod and the second piston rod, improving the movement and force uniformity of the first hydraulic component and the second hydraulic component, enhancing the dynamic running consistency and stability of the first hydraulic component and the second hydraulic component, and optimizing the overall running performance of the first hydraulic component and the second hydraulic component.

[0070] In the present invention application, although the technical problem of the synchronous movement of the first piston rod 2017 and the second piston rod 2027 is solved through the simple above-mentioned first synchronization coefficient S1, second synchronization coefficient S2, and synchronization coefficient judgment, in actual processes, the injection device of the injection molding machine usually works for a long time. How to more intelligently judge whether the first piston rod 2017 and the second piston rod 2027 are synchronously moving to drive the threaded rod to complete the injection process of the threaded rod becomes very important. Further, the applicant has proposed corresponding solution technical schemes.

[0071] Optionally, the front panel assembly 200 further includes: a first adjustment assembly, a second adjustment assembly, a first distance sensor 2010, and a second distance sensor 2020. The first distance sensor 2010 is installed on the first gland 2016, and the second distance sensor 2020 is installed on the second gland 2026. The first distance sensor measures the distance between the first gland and the first limiting member, and the second distance sensor measures the distance between the second gland and the second limiting member. The first adjustment assembly includes a first cylinder and a first limiting member. The first cylinder is connected to the first limiting member, and the first limiting member is slidably engaged with the first piston rod. The second adjustment assembly includes a second cylinder and a second limiting member. The second cylinder is connected to the second limiting member, and the second limiting member is slidably engaged with the second piston rod. The first cylinder and the second cylinder are both connected to the rear panel assembly. The front panel assembly 200 includes a first synchronization coefficient S1 i, a second synchronization coefficient S2 i, and a third synchronization coefficient S i. The first synchronization coefficient S1 i, the second synchronization coefficient S2 i, and the third synchronization coefficient S i are respectively:

[0072] S1 i = (L11 - L1 i) / L11 + (L1 i - L2 i) / (L1 i + L2 i)

[0073] S2 i = (L21 - L2 i) / L21 + (L1 i - L2 i) / L2 i

[0074] S i = (S1 i + S2 i) / (L11 + L12)

[0075] Wherein, L11 is the initial distance between the first limiting member 20191 and the first gland 2016 when the initial movement of the first piston rod stops along the D-rear direction; L21 is the initial distance between the second limiting member 20191 and the second gland 2016 when the initial movement of the second piston rod stops along the D-rear direction; L1 i is the distance between the i-th first limiting member 20191 and the first gland 2016 when the i-th movement of the first piston rod stops along the D-rear direction; L2i is the distance between the i-th second limiting member 20291 and the second gland 2026 when the i-th movement of the second piston rod stops along the D-rear direction, and i = 2, 3,..., i is a positive integer.

[0076] In some embodiments, when the first piston rod moves along the D-back direction and stops moving, the first piston presses against and contacts the second first end cap, that is, the second first end cap limits the first piston to prevent the movement of the first piston rod, so that the first piston rod stops moving. Correspondingly, when the first piston rod moves along the D-forward direction and stops moving, the first limiting member presses against and contacts the first gland, that is, the first gland limits the first limiting member to prevent the movement of the first piston rod, so that the first piston rod stops moving. At the same time, when the second piston rod moves along the D-back direction and stops moving, the second piston presses against and contacts the second second end cap, that is, the second second end cap limits the second piston to prevent the movement of the second piston rod, so that the second piston rod stops moving. Correspondingly, when the second piston rod moves along the D-forward direction and stops moving, the second limiting member presses against and contacts the second gland, that is, the second gland limits the second limiting member to prevent the movement of the second piston rod, so that the second piston rod stops moving. When the first piston rod moves along the D-back direction and stops moving for the i-th time, the distance between the i-th first limiting member 20191 and the first gland 2016 is L1 i. When the second piston rod moves along the D-back direction and stops moving for the i-th time, the distance between the i-th second limiting member 20191 and the second gland 2016 is L2 i. The position of the first gland is basically fixed and does not change. The position of the second gland is basically fixed and does not change. Accordingly, a first distance sensor can be used to measure the distance between the first limiting member 20191 and the first gland 2016, and a second distance sensor can be used to measure the distance between the second limiting member 20291 and the second gland 2026.

[0077] In some embodiments, the synchronization coefficient three S i can be comprehensively set for the synchronization coefficient one S1 i and the synchronization coefficient two S2i as a whole. The synchronization coefficient one S1 i, the synchronization coefficient two S2i, and the synchronization coefficient three S i can be used during the maintenance after the long-term operation of the injection molding machine to ensure the stability and synchronization of the long-term operation of the injection molding machine. After the synchronization coefficient one S1 i, the synchronization coefficient two S2i, and the synchronization coefficient three S i are set, by adjusting the distance between the first limiting member and the first gland, and the distance between the second limiting member and the second gland, the overall synchronization of the first piston rod and the second piston rod can be improved, the inconsistency of the movement strokes of the first piston rod and the second piston rod in the long term can be avoided, the movement and force uniformity of the first hydraulic component and the second hydraulic component can be improved, the dynamic operation consistency and stability of the first hydraulic component and the second hydraulic component can be enhanced, and the long-term overall operation performance of the first hydraulic component and the second hydraulic component can be optimized.

[0078] In some embodiments, when the first hydraulic component and the second hydraulic component are synchronized, the corresponding synchronization coefficient one S1i, synchronization coefficient two S2i, and synchronization coefficient three Si satisfy the set range. When the first hydraulic component and the second hydraulic component are not synchronized, the corresponding synchronization coefficient one S1i, synchronization coefficient two S2i, and synchronization coefficient three Si will not satisfy the set range. The injection molding machine can be shut down, and the distance between the first limiting member 20191 and the first gland 2016 can be adjusted manually, and the distance between the second limiting member 20291 and the second gland can be adjusted. Of course, the first cylinder and the second cylinder can also be controlled to adjust the distance between the first limiting member 20191 and the first gland 2016, and the distance between the second limiting member 20291 and the second gland respectively. Correspondingly, in place of the front plate assembly in the above embodiments, the front plate assembly 200 includes: a first adjustment assembly and a second adjustment assembly. The first adjustment assembly includes a first cylinder and a first limiting member. The first cylinder is connected to the first limiting member, and the first limiting member is slidably engaged with the first piston rod. The second adjustment assembly includes a second cylinder and a second limiting member. The second cylinder is connected to the second limiting member, and the second limiting member is slidably engaged with the second piston rod. The first cylinder and the second cylinder are both connected to the rear plate assembly. In this way, the first cylinder can adjust the position of the first limiting member on the first piston rod, and the second cylinder can adjust the position of the second limiting member on the second piston rod, so as to adjust the stroke of the first piston rod and the stroke of the second piston rod, and finally make the first piston rod 2017 and the second piston rod 2027 move synchronously.

[0079] In a second aspect, the present invention application provides a control method for an injection device of an injection molding machine, using the injection device of the injection molding machine described in any one of the above, including:

[0080] Step S100: Obtain the synchronization information of the front plate assembly, and determine whether the first hydraulic component and the second hydraulic component are synchronized. If so, enter step S200. If not, enter step S300;

[0081] Step S200: When the differential opening synchronization operation mode is adopted, the first piston unit extends relative to the first cylinder barrel two, and the second piston unit extends relative to the second cylinder barrel two, driving the threaded rod to move along the D rear direction; or, the first piston unit retracts relative to the first cylinder barrel two, and the second piston unit retracts relative to the second cylinder barrel two, and then drives the screw to move along the D front direction for injection; when the differential closing synchronization operation mode is adopted, the first piston unit expands and contracts relative to the first cylinder barrel two, and the second piston unit expands and contracts relative to the second cylinder barrel two, driving the screw to move along the D direction.

[0082] Specifically, step S200 includes:

[0083] Step S201: When operating in the differential opening synchronous mode, the first piston unit extends relative to the first cylinder two, and the second piston unit extends relative to the second cylinder two, driving the threaded rod to move along the D rear direction; or, the first piston unit retracts relative to the first cylinder two, and the second piston unit retracts relative to the second cylinder two, thereby driving the screw to move along the D front direction for injection molding, and the injection molding speed is the first speed. Specifically, step S201 includes:

[0084] When the first oil hole 20133 of the first hydraulic component is supplied with oil and at the same time the second oil hole 2033 of the second hydraulic component is supplied with oil, it pushes the first piston unit to extend relative to the first cylinder two, and the second piston unit to extend relative to the second cylinder two. The third oil hole 20151 of the first hydraulic component returns oil, and at the same time the third oil hole 20251 of the second hydraulic component returns oil, driving the threaded rod 102 to move along the D rear direction; when the first oil hole 20133 of the first hydraulic component returns oil and at the same time the second oil hole 2033 of the second hydraulic component returns oil, the oil returning from the first oil hole 20133 enters the third oil hole 20151. The third oil hole 20151 of the first hydraulic component is supplied with oil, and at the same time the third oil hole 20251 of the second hydraulic component is supplied with oil. The first piston unit retracts relative to the first cylinder two, and the second piston unit retracts relative to the second cylinder two, thereby driving the screw 402 to move along the D front direction, and further driving the screw to move along the D front direction for injection molding, and the injection molding speed is the first speed.

[0085] Step S202: When operating in the differential closing synchronous mode, the first piston unit expands and contracts relative to the first cylinder two, and the second piston unit expands and contracts relative to the second cylinder two, driving the screw to move along the D direction, and the injection molding speed is the second speed. Specifically, step S202 includes:

[0086] When the first oil hole 20133 of the first hydraulic component is supplied with oil and at the same time the second oil hole 2033 of the second hydraulic component is supplied with oil, it pushes the first piston unit to extend relative to the first cylinder two, and the second piston unit to extend relative to the second cylinder two. The third oil hole 20151 of the first hydraulic component returns oil, and at the same time the third oil hole 20251 of the second hydraulic component returns oil, driving the threaded rod 102 to move along the D rear direction; when the first oil hole 20133 of the first hydraulic component returns oil and at the same time the second oil hole 2033 of the second hydraulic component returns oil, the third oil hole 20151 of the first hydraulic component is supplied with oil, and at the same time the third oil hole 20251 of the second hydraulic component is supplied with oil. The first piston unit retracts relative to the first cylinder two, and the second piston unit retracts relative to the second cylinder two, thereby driving the screw 402 to move along the D front direction, and further driving the screw to move along the D front direction for injection molding, and the injection molding speed is the second speed.

[0087] Steps S201 and S202 can be switched with each other, and the first speed is greater than the second speed.

[0088] Optionally, step S100 includes:

[0089] Step S101A: Obtain the synchronization information of the front panel assembly. Determining whether the first hydraulic component and the second hydraulic component are synchronized includes: obtaining a first synchronization coefficient S1, a second synchronization coefficient S2, and a synchronization coefficient S, and determining whether the first synchronization coefficient S1 is less than a first preset value R1, determining whether the second synchronization coefficient S2 is less than a second preset value R2, and determining whether the synchronization coefficient S is less than a preset value R. The first synchronization coefficient S1, the second synchronization coefficient S2, and the synchronization coefficient S are respectively:

[0090] S1 = (L1 - L2) / L1

[0091] S2 = (L1 - L2) / L2

[0092] S = S1 - S2

[0093] Wherein, L1 is the distance between the first limit member 20191 and the first gland 2016 when the first piston rod stops moving along the D-back direction; L2 is the distance between the second limit member 20291 and the second gland 2026 when the second piston rod stops moving along the D-back direction.

[0094] Step S102A: If S1 ≤ R1, S2 ≤ R2, S3 ≤ R, that is, the first hydraulic component and the second hydraulic component are synchronized, then enter step S200; if S1 > R1 or S2 > R2 or S3 > R, the first hydraulic component and the second hydraulic component are not synchronized, and enter step S300A.

[0095] Step S300A includes: adjusting the distance between the first limit member 20191 and the first gland 2016, and adjusting the distance between the second limit member 20291 and the second gland until the following conditions are met: S1 ≤ R1, S2 ≤ R2, S3 ≤ R.

[0096] In some embodiments, when S1 ≤ R1, S2 ≤ R2, and S3 ≤ R, the first hydraulic component and the second hydraulic component are synchronized. If the first hydraulic component and the second hydraulic component are not synchronized, it is necessary to adjust the distance between the first limiting member 20191 and the first gland 2016, and adjust the distance between the second limiting member 20291 and the second gland, avoiding stagnation or errors caused by the non-synchronization of the first hydraulic component and the second hydraulic component, reducing the mechanical impact caused by the mismatch of the strokes of the first piston rod and the second piston rod. By setting through step S101A, step S102A, and step S300A, the service life of the front plate assembly can be extended, the overall operation stability of the injection device front plate assembly of the injection molding machine can be improved, and the reliability and stability of the injection molding machine after long-term operation can be ensured.

[0097] Optionally, step S100 includes:

[0098] Step S101B: Obtain the synchronization information of the front plate assembly. Determining whether the first hydraulic component and the second hydraulic component are synchronized includes: obtaining a first synchronization coefficient S1i, a second synchronization coefficient S2i, and a synchronization coefficient Si, and determining whether the first synchronization coefficient S1i is less than a first preset value T1, determining whether the second synchronization coefficient S2i is less than a second preset value T2, and determining whether the third synchronization coefficient Si is less than a third preset value T3. The first synchronization coefficient S1i, the second synchronization coefficient S2i, and the third synchronization coefficient Si are respectively:

[0099] S1i = (L11 - L1i) / L11 + (L1i - L2i) / (L1i + L2i)

[0100] S2i = (L21 - L2i) / L21 + (L1i - L2i) / L2i

[0101] Si = (S1i + S2i) / (L11 + L12)

[0102] Wherein, L11 is the initial distance between the first limiting member 20191 and the first gland 2016 when the initial movement of the first piston rod stops along the D-back direction, L21 is the initial distance between the second limiting member 20191 and the second gland 2016 when the initial movement of the second piston rod stops along the D-back direction; L1i is the distance between the i-th first limiting member 20191 and the first gland 2016 when the i-th first piston rod movement stops along the D-back direction; L2i is the distance between the i-th second limiting member 20291 and the second gland 2026 when the i-th second piston rod movement stops along the D-back direction, i = 2, 3,..., and i is a positive integer.

[0103] Step S102B: If S1 i≤T1, S2i≤T2, and S3i≤T3, that is, the first hydraulic component and the second hydraulic component are synchronized, then proceed to step S200; if S1>T1 or S2>T2 or S3>T3, and the first hydraulic component and the second hydraulic component are not synchronized, proceed to step S300B.

[0104] Step S300B includes: adjusting the distance between the first limiting member 20191 and the first gland, and adjusting the distance between the second limiting member 20291 and the second gland until the following conditions are met: S1 i≤T1, S2i≤T2, and S3 i≤T.

[0105] In some embodiments, when S1 i≤T1, S2i≤T2, and S3i≤T3, the first hydraulic component and the second hydraulic component are synchronized. When the first hydraulic component and the second hydraulic component are not synchronized, the injection molding machine can be stopped, and the distance between the first limiting member 20191 and the first gland 2016 can be adjusted manually, and the distance between the second limiting member 20291 and the second gland can be adjusted. Of course, the distance between the first limiting member 20191 and the first gland 2016 can also be adjusted automatically, and the distance between the second limiting member 20291 and the second gland can be adjusted. Correspondingly, the front plate assembly 200 includes: a first adjustment assembly and a second adjustment assembly. The first adjustment assembly includes a first cylinder and a first limiting member. The first cylinder is connected to the first limiting member, and the first limiting member is slidably engaged with the first piston rod. The second adjustment assembly includes a second cylinder and a second limiting member. The second cylinder is connected to the second limiting member, and the second limiting member is slidably engaged with the second piston rod. The first cylinder and the second cylinder are both connected to the rear plate assembly. In this way, the first cylinder can adjust the position of the first limiting member on the first piston rod, and the second cylinder can adjust the position of the second limiting member on the second piston rod, thereby adjusting the stroke of the first piston rod and the stroke of the second piston rod, and finally enabling the first piston rod 2017 and the second piston rod 2027 to move synchronously.

[0106] In the application of the present invention, first, steps S101B and S102B ensure the synchronization of the first hydraulic component and the second hydraulic component in real time (by determining whether the synchronization coefficients S1i, S2i, and S3i meet the conditions of the preset values T1, T2, and T3), ensuring that the first piston rod and the second piston rod of the front plate assembly are always synchronized. If they are found to be asynchronous, step S300B is entered for automatic adjustment to ensure the precise synchronous operation of the first piston rod and the second piston rod. Additionally, the entire injection unit of the injection molding machine can automatically detect asynchronous situations and can manually or automatically adjust the distance between the first limit member and the first gland, and the distance between the second limit member and the second gland, effectively eliminating unstable factors such as mechanical shock and vibration caused by asynchronous problems, thereby ensuring the stability of the entire injection unit of the injection molding machine during operation, being able to adapt to changes under different working conditions. Whether under high pressure, heavy load, or high speed conditions, the synchronization between hydraulic components can be ensured, reducing the failure and maintenance costs of the injection unit of the injection molding machine, extending the service life of the injection unit of the injection molding machine, and optimizing the automation level during the process of the injection unit of the injection molding machine.

[0107] Thus, in the control method of the injection unit of the injection molding machine disclosed in the application of the present invention, first, by controlling the synchronization of the first hydraulic component and the second hydraulic component in real time, it can be ensured that the first hydraulic component and the second hydraulic component can be in a synchronous state for a long time, avoiding mechanical shock and vibration problems caused by asynchrony, improving the long-term accuracy and stability during the injection process, ensuring the uniformity of the injection volume, speed, and pressure, reducing dimensional deviations and product defects, and continuously improving the consistency of plastic products. Additionally, when the first hydraulic component and the second hydraulic component are asynchronous, by adjusting the distance between the first limit member and the first gland, and the distance between the second limit member and the second gland, the synchronization of the first hydraulic component and the second hydraulic component is ensured, extending the service life and reliability of the injection unit of the injection molding machine, and being able to ensure that the injection of the injection molding machine maintains an efficient and stable working state during long-term production, reducing accidental failures of the injection molding machine, and improving the production efficiency of the injection molding machine.

[0108] In a third aspect, an injection molding machine adopts any one of the injection units of the injection molding machine described in the first aspect above or uses the control method of any one of the injection units of the injection molding machine described in the second aspect above.

[0109] It should be noted that the injection molding machine of the present invention application adopts any one of the injection molding machine injection devices described in the above first aspect or uses the control method of any one of the injection molding machine injection devices described in the above second aspect. Correspondingly, it also includes all the technical problems, technical solutions, and technical effects recorded in any one of the injection molding machine injection devices described in the first aspect or any one of the control methods of the injection molding machine injection devices described in the second aspect. The present invention application will not repeat them here.

[0110] Although several specific implementation details are included in the above description, these should not be construed as limiting the scope of the present application. Combinations of the above different examples are also within the scope of protection of the present application. Certain features described in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, the various features described in the context of a single embodiment can also be implemented separately or in any suitable sub-combination in multiple embodiments.

[0111] As described above, although the present invention application has been shown and described with reference to specific preferred embodiments, it should not be construed as a limitation on the present invention application itself. Various changes can be made to it in form and detail without departing from the spirit and scope of the present invention application defined by the appended claims.

Claims

1. A glue injection device for an injection molding machine, characterized in that: include: A melt glue assembly, a front plate assembly and a rear plate assembly, the melt glue assembly is connected to the front plate assembly, the front plate assembly is connected to the rear plate assembly, the melt glue assembly includes a material tube and a spiral rod, the spiral rod slides relative to the material tube, the front plate assembly includes a first hydraulic assembly, a second hydraulic assembly and a connecting assembly, the connecting assembly connects the first hydraulic assembly and the second hydraulic assembly; the first hydraulic assembly includes a first hydraulic cylinder unit 1, a first hydraulic cylinder unit 2, and a first piston unit, the first hydraulic cylinder unit 1 is connected to the outside of the first hydraulic cylinder unit 2, and the first piston unit telescopically moves relative to the first hydraulic cylinder unit 2; the second hydraulic assembly includes a second hydraulic cylinder unit 1, a second hydraulic cylinder unit 2, and a second piston unit, the second hydraulic cylinder unit 1 is connected to the outside of the second hydraulic cylinder unit 2, the second piston unit telescopically moves relative to the second hydraulic cylinder unit 2, the first piston unit and the second piston unit are connected to the rear plate assembly, and the spiral rod connects the rear plate assembly.

2. The injection molding machine injection device according to claim 1, characterized in that: The first hydraulic cylinder unit 1 includes a first cylinder barrel 1 and a first flange, the first cylinder barrel 1 is connected to the first flange, the first hydraulic cylinder unit 2 includes a first end cover 1, a first cylinder barrel 2, a first end cover 2, and a first pressure cover, one side of the first end cover 1 is connected to the first flange, the other side of the first end cover 1 is connected to the first cylinder barrel 2, the first cylinder barrel 2 is connected to the first end cover 2, and the first end cover 2 is connected to the first pressure cover, the first piston unit includes a first piston, a first piston mounting member, and a first piston rod, the first piston rod includes a first piston rod 1, a first piston rod 2, and a first piston rod 3, one side of the first piston rod 2 is connected to the first piston rod 1, the other side of the first piston rod 2 is connected to the first piston rod 3, the first piston mounting member is installed on the first piston rod 2, the first piston mounting member is connected to the first piston, the first piston rod telescopes and moves relative to the first cylinder barrel 1, the first piston rod telescopes and moves relative to the first cylinder barrel 2, and the first piston moves along the D direction on the first cylinder barrel 2.

3. The injection molding machine injection device according to claim 2, characterized in that: The second hydraulic cylinder unit 1 includes a second cylinder barrel 1 and a second flange plate, the second cylinder barrel 1 is connected to the second flange plate, the second hydraulic cylinder unit 2 includes a second end cover 1, a second cylinder barrel 2, a second end cover 2, and a second pressure cover, one side of the second end cover 1 is connected to the second flange plate, the other side of the second end cover 1 is connected to the second cylinder barrel 2, the second cylinder barrel 2 is connected to the second end cover 2, and the second end cover 2 is connected to the second pressure cover, the second piston unit includes a second piston, a second piston mounting member, and a second piston rod, the second piston rod includes a second piston rod 1, a second piston rod 2, and a second piston rod 3, one side of the second piston rod 2 is connected to the second piston rod 1, the other side of the second piston rod 2 is connected to the second piston rod 3, the second piston mounting member is installed on the second piston rod 2, the second piston mounting member is connected to the second piston, the second piston rod telescopes and moves relative to the second cylinder barrel 1, the second piston rod telescopes and moves relative to the second cylinder barrel 2, and the second piston moves along the D direction on the second cylinder barrel 2.

4. The injection molding machine injection device according to claim 3, characterized in that: The first end cover 1 is provided with a first through hole 1, a first through hole 2, a first oil hole 1, and a first oil hole 2, and the first end cover 2 is provided with a first oil hole 3; the second end cover 1 is provided with a second through hole 1, a second through hole 2, and a second through hole, and the second end cover 2 is provided with a second oil hole 3, the first oil hole 3 is connected to the second oil hole 3, and the first oil hole 2 is connected to the second oil hole.

5. The injection molding machine injection device according to claim 4, characterized in that The injection molding machine injection device includes a differential opening synchronous operation mode and a differential closing synchronous operation mode. In the differential opening synchronous operation mode, the first piston unit extends relative to the first cylinder barrel 2, and the second piston unit extends relative to the second cylinder barrel 2, driving the threaded rod to move along the D rear direction; or, the first piston unit retracts relative to the first cylinder barrel 2, and the second piston unit retracts relative to the second cylinder barrel 2, thereby driving the screw rod to move along the D front direction for injection; in the differential closing synchronous operation mode, the first piston unit telescopes relative to the first cylinder barrel 2, and the second piston unit telescopes relative to the second cylinder barrel 2, driving the screw rod to move along the D direction.

6. The injection molding machine injection device according to claim 5, characterized in that The front plate assembly also includes: a first adjustment locking assembly and a second adjustment locking assembly, the first adjustment locking assembly includes a first limit member and a first locking member, the first limit member moves on the first piston rod, the first locking member is connected to the first limit member to connect and fix the first limit member, the second adjustment locking assembly includes a second limit member and a second locking member, the second limit member moves on the second piston rod, and the second locking member is connected to the second limit member to connect and fix the second limit member.

7. The injection molding machine injection device according to claim 5, characterized in that The front plate assembly also includes: a first adjustment assembly, a second adjustment assembly, a first distance sensor, and a second distance sensor. The first distance sensor is installed on the first pressure cover, and the second distance sensor is installed on the second pressure cover. The first distance sensor measures the distance between the first pressure cover and the first limit member, and the second distance sensor measures the distance between the second pressure cover and the second limit member. The first adjustment assembly includes a first cylinder and a first limit member. The first cylinder is connected to the first limit member, and the first limit member is slidably matched with the first piston rod. The second adjustment assembly includes a second cylinder and a second limit member. The second cylinder is connected to the second limit member, and the second limit member is slidably matched with the second piston rod. The first cylinder and the second cylinder are both connected to the rear plate assembly.

8. A control method for a glue injection device of an injection molding machine, which adopts a glue injection device of an injection molding machine as claimed in any one of claims 6 to 7, characterized in that: include: Step S100: Acquire synchronization information of the front panel assembly, and determine whether the first hydraulic assembly and the second hydraulic assembly are synchronized. If yes, proceed to step S200; if not, proceed to step S300; Step S200: In the differential opening synchronous operation mode, the first piston unit extends relative to the first cylinder barrel 2, and the second piston unit extends relative to the second cylinder barrel 2, driving the threaded rod to move along the D rear direction; or, the first piston unit retracts relative to the first cylinder barrel 2, and the second piston unit retracts relative to the second cylinder barrel 2, thereby driving the screw rod to move along the D front direction for injection; in the differential closing synchronous operation mode, the first piston unit telescopes relative to the first cylinder barrel 2, and the second piston unit telescopes relative to the second cylinder barrel 2, driving the screw rod to move along the D direction.

9. A control method for a glue injection device of an injection molding machine according to claim 8, characterized in that: Step S200 includes: Step S201: In the differential start synchronous operation mode, the first piston unit extends relative to the first cylinder barrel 2, and the second piston unit extends relative to the second cylinder barrel 2, driving the threaded rod to move along the D rear direction; or, the first piston unit retracts relative to the first cylinder barrel 2, and the second piston unit retracts relative to the second cylinder barrel 2, thereby driving the screw rod to move along the D front direction for injection, and the injection speed is the first speed; Step S202: In the differential closing synchronous operation mode, the first piston unit telescopes relative to the first cylinder barrel 2, and the second piston unit telescopes relative to the second cylinder barrel 2, driving the screw to move along the D direction, and the injection speed is the second speed; Steps S201 and S202 can be switched with each other, and the first speed is greater than the second speed.

10. An injection molding machine, using an injection molding machine injection device according to any one of claims 1 to 7 or a control method for an injection molding machine injection device according to any one of claims 8 to 9.

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