Injection molding machine platen nozzle assembly top off force device

Abstract

The utility model relates to nozzle assembly abutting force device technical field, especially inject the machine shooting platform establishes nozzle assembly abutting force device, including nozzle assembly, still include two five -way reversing valve, booster pump and hydraulic cylinder, nozzle assembly assembly is on the injection molding machine shooting platform and and hydraulic cylinder's piston rod connection, two five -way reversing valve's P mouth is linked together with outside gas source, two five -way reversing valve's A mouth and the rodless chamber intercommunication of booster pump, two five -way reversing valve's B mouth and the rod chamber intercommunication of booster pump, two five -way reversing valve's R1 mouth and R2 mouth and outside intercommunication, the hydraulic output end of booster pump and the rod chamber intercommunication of hydraulic cylinder, when using, through outside gas source cooperation two five -way reversing valve, realize control booster pump operation, cooperate and establish oil pressure between booster pump and hydraulic cylinder, realize the abutting force of control nozzle assembly, need not high -power motor, reduce motor power, remove frequency changer, position detection device, reduce cost.

Description

Technical Field

[0001] This utility model relates to the technical field of nozzle assembly backing force device, and in particular to a nozzle assembly backing force device for injection molding machine injection stage. Background Technology

[0002] The nozzle assembly backing force establishment system is one of the core functions of a fully electric horizontal injection molding machine, crucial for ensuring injection quality, preventing material leakage, and accurately transmitting injection pressure. It differs significantly from the implementation method of traditional hydraulic injection molding machines, primarily utilizing servo motors and precision mechanical transmissions. Existing nozzle assembly backing force control systems mainly consist of a frequency converter, a variable frequency motor, a position detection device, and a nozzle assembly backing force detection switch. The variable frequency motor has relatively high power and energy consumption. The position detection device, using an electronic ruler or encoder, detects the nozzle assembly position to prevent overshoot. The nozzle assembly backing force detection switch measures the compression of the spring to proportionally calculate the backing force. Therefore, existing nozzle assembly backing force control systems involve numerous components, resulting in high usage and maintenance costs, frequent maintenance cycles, cumbersome post-maintenance adjustments, high labor intensity, low work efficiency, and impacting the normal operation of the injection molding machine. Utility Model Content

[0003] The technical problem to be solved by this utility model is: in order to solve the problem that the existing nozzle assembly backing force control system includes many components, resulting in high use and maintenance costs, frequent maintenance cycles, and complicated debugging after maintenance, high labor intensity, low work efficiency, and affecting the normal operation of the injection molding machine, a nozzle assembly backing force device for injection molding machine is provided.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a nozzle assembly backing force device for an injection molding machine injection unit, including a nozzle assembly, a two-position five-way reversing valve, a booster pump and a hydraulic cylinder. The nozzle assembly is assembled on the injection molding machine injection unit and connected to the piston rod of the hydraulic cylinder. The P port of the two-position five-way reversing valve is connected to an external air source. The A port of the two-position five-way reversing valve is connected to the rodless chamber of the booster pump. The B port of the two-position five-way reversing valve is connected to the rod chamber of the booster pump. The R1 and R2 ports of the two-position five-way reversing valve are connected to the outside. The hydraulic output end of the booster pump is connected to the rod chamber of the hydraulic cylinder. Compared to existing technologies, this solution uses an external air source in conjunction with a two-position five-way directional valve to control the operation of the booster pump. The booster pump and the hydraulic cylinder work together to establish oil pressure, thereby controlling the pushing force of the nozzle assembly. This eliminates the need for a high-power motor, reducing the power consumption of the motor. It also eliminates the need for frequency converters, position detection devices, etc., thus reducing operating costs. Since the air circuit is shared with other mechanisms, it does not increase costs, and the debugging process is very simple and reliable.

[0005] To ensure stable and reliable return of the hydraulic cylinder, in some preferred embodiments, a return spring is provided in the rodless chamber of the hydraulic cylinder for piston rod return. By providing a return spring in the rodless chamber, the return spring helps the hydraulic cylinder return to its initial position.

[0006] In some preferred embodiments, the hydraulic cylinders are in two sets, which are arranged in parallel to each other, and the nozzle assembly is disposed between the two sets of hydraulic cylinders.

[0007] In order to monitor the pressure at the hydraulic output end of the booster pump, in some preferred embodiments, a pressure sensor is installed on the pipeline between the hydraulic output end of the booster pump and the rod chamber of the hydraulic cylinder.

[0008] In order to facilitate the control of the gas source pressure of the booster pump, in some preferred embodiments, a proportional pressure regulating valve for adjusting the gas pressure is provided between the two-position five-way reversing valve and the external gas source.

[0009] To facilitate control of the gas path, some preferred embodiments further include a two-position three-way reversing valve, wherein the P port of the two-position three-way reversing valve is connected to an external gas source, the A port of the two-position three-way reversing valve is connected to the P port of a two-position five-way reversing valve, and the R port of the two-position three-way reversing valve is connected to the outside.

[0010] To prevent impurities in the gas path from affecting the normal operation of subsequent equipment, in some preferred embodiments, a filter is installed between port A of the two-position three-way reversing valve and port P of the two-position five-way reversing valve. The filter removes impurities from the gas source, ensuring stable and reliable operation of the components in the gas path.

[0011] To ensure stable and reliable overall gas pressure, in some preferred embodiments, a pressure reducing valve is provided between the filter and the P port of the two-position five-way directional valve. This pressure reducing valve ensures stable and reliable pressure throughout the system.

[0012] To facilitate understanding of the pressure in the gas circuit, in some preferred embodiments, a pressure gauge is installed between the pressure reducing valve and the P port of the two-position five-way directional valve. Using the pressure gauge, operators can directly observe the current main pressure conditions of the gas circuit.

[0013] In some preferred embodiments, the two-position five-way directional valve is a two-position five-way solenoid directional valve.

[0014] The beneficial effects of this utility model are as follows: When using the nozzle assembly backing force device of this utility model for injection molding machine, the operation of the booster pump is controlled by an external air source in conjunction with a two-position five-way reversing valve. The booster pump and the hydraulic cylinder work together to establish oil pressure, thereby controlling the backing force of the nozzle assembly. It eliminates the need for a high-power motor, reducing the power consumption of the motor, and removes the frequency converter, position detection device, etc., thus reducing the operating cost. Since the air circuit is shared with other mechanisms, it does not increase costs. The debugging is also very simple and reliable. It avoids the problems of existing nozzle assembly backing force control systems, which include many components, resulting in high operating and maintenance costs, frequent maintenance cycles, and complicated debugging after maintenance, high labor intensity, low work efficiency, and affecting the normal operation of the injection molding machine. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the gas path structure of this utility model.

[0018] In the diagram: 1. Nozzle assembly, 2. Two-position five-way directional valve, 3. Booster pump, 4. Hydraulic cylinder, 5. Return spring, 6. Pressure sensor, 7. Proportional pressure regulating valve, 8. Two-position three-way directional valve, 9. Filter, 10. Pressure reducing valve, 11. Pressure gauge. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the embodiments:

[0020] This utility model is not limited to the following specific embodiments. Those skilled in the art can implement this utility model using various other specific embodiments based on the disclosed content. Any modifications or alterations to the design structure and concept of this utility model also fall within the protection scope of this utility model. It should be noted that, unless otherwise specified, the embodiments and features described in this utility model can be combined with each other.

[0021] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 utility model based on the specific circumstances.

[0023] like Figure 1-2 As shown, an injection molding machine injection stage nozzle assembly backing force device includes a nozzle assembly 1, a two-position five-way directional valve 2, a booster pump 3, and a hydraulic cylinder 4. The injection stage itself is connected to a motor via a screw nut drive. The injection stage is fixedly mounted on the piston rod of the hydraulic cylinder 4 via a connecting plate. The nozzle assembly 1 is fixedly mounted on the injection stage. There are two sets of hydraulic cylinders 4, which are arranged parallel to each other. The nozzle assembly 1 is located between the two sets of hydraulic cylinders 4. The P port of the two-position five-way directional valve 2 is connected to an external air source. The A port of the two-position five-way directional valve 2 is connected to the rodless chamber of the booster pump 3. The B port of the two-position five-way directional valve 2 is connected to the rod chamber of the booster pump 3. The R1 and R2 ports of the two-position five-way directional valve 2 are connected to the outside. The hydraulic output end of the booster pump 3 is connected to the rod chamber of the hydraulic cylinder 4. A return spring 5 for piston rod return is provided in the rodless chamber of the hydraulic cylinder 4. A pressure sensor 6 is provided on the pipeline between the hydraulic output end of the booster pump 3 and the rod chamber of the hydraulic cylinder 4.

[0024] The top-support device also includes a two-position three-way directional valve 8, a two-position five-way directional valve 2, and a proportional pressure regulating valve 7 for adjusting gas pressure between the two-position three-way directional valve 8 and the external air source. The P port of the two-position three-way directional valve 8 is connected to the external air source. The A port of the two-position three-way directional valve 8 is connected to the P port of the two-position five-way directional valve 2. The R port of the two-position three-way directional valve 8 is connected to the outside. A filter 9 is installed between the A port of the two-position three-way directional valve 8 and the P port of the two-position five-way directional valve 2. A pressure reducing valve 10 is installed between the filter 9 and the P port of the two-position five-way directional valve 2. A pressure gauge 11 is installed between the pressure reducing valve 10 and the P port of the two-position five-way directional valve 2.

[0025] In this embodiment, the two-position five-way directional valve 2 is a two-position five-way solenoid directional valve.

[0026] When the above-mentioned injection molding machine nozzle assembly backing force device is in use, the external air source first enters the filter 9 through the upper position of the two-position three-way directional valve 8. The P port to A port of the two-position three-way directional valve 8 is then filtered. The input pressure is then adjusted by the pressure reducing valve 10, and the gas pressure is observed by the pressure gauge 11. Then, the gas enters the proportional pressure regulating valve 7 to regulate the air pressure input to the two-position five-way directional valve 2. The gas is adjusted to enter the P port of the two-position five-way directional valve 2. When the two-position five-way directional valve 2 is in the left position, the gas flows from the P port of the two-position five-way directional valve 2. The gas enters the rodless chamber of the booster pump 3 through port A. The gas in the rod chamber of the booster pump 3 is discharged through port B of the two-position five-way reversing valve 2 to port R2. The hydraulic output end of the booster pump 3 delivers the pressure oil to the rod chamber of the hydraulic cylinder 4. The piston rod of the hydraulic cylinder 4 retracts and, in conjunction with the motor, drives the screw nut mechanism to move the nozzle assembly 1 synchronously. The restoring spring 5 in the rodless chamber of the hydraulic cylinder 4 is compressed. The motor itself applies a force to the nozzle assembly 1, plus the pushing force of the hydraulic cylinder 4 on the nozzle assembly 1, thereby pressing the nozzle assembly 1 against the mold.

[0027] After injection molding is completed, the motor rotates in reverse. The two-position three-way valve remains unchanged and is in the upper position. The two-position five-way directional valve 2 is in the right position. Gas enters the rod chamber of the booster pump 3 from port P to port B of the two-position five-way directional valve 2. Gas in the rodless chamber of the booster pump 3 is discharged through port A to port R1 of the two-position five-way directional valve 2. The hydraulic oil in the rod chamber of the hydraulic cylinder 4 flows back to the hydraulic output end of the booster pump 3. Under the action of the return spring 5, the piston rod of the hydraulic cylinder 4 extends and, in conjunction with the motor, drives the screw nut mechanism to drive the nozzle assembly 1 to move synchronously. The return spring 5 in the rodless chamber of the hydraulic cylinder 4 returns to its original position and drives the nozzle assembly 1 to return to its original position.

[0028] The power of the motor can be reduced to 1 / 3 of the original motor power, and a frequency converter is not needed. The spring detection device is eliminated, and the top force control of the nozzle assembly 1 is more precise than before. Since the accuracy of the hydraulic cylinder 4 can ensure the accuracy of the displacement of the nozzle assembly 1, the accuracy of the detection position can be greatly reduced. Since the air circuit is shared with other mechanisms, no cost is increased. Compared with the original device, fewer components are used, and the debugging is very simple and reliable.

[0029] The above description, based on the preferred embodiments of this utility model, provides inspiration. Those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification but must be determined according to the claims.

Claims

1. A nozzle assembly backing device for an injection molding machine, comprising a nozzle assembly (1), characterized in that: It also includes a two-position five-way directional valve (2), a booster pump (3) and a hydraulic cylinder (4). The nozzle assembly (1) is mounted on the injection molding machine injection table and connected to the piston rod of the hydraulic cylinder (4). The P port of the two-position five-way directional valve (2) is connected to an external air source. The A port of the two-position five-way directional valve (2) is connected to the rodless chamber of the booster pump (3). The B port of the two-position five-way directional valve (2) is connected to the rod chamber of the booster pump (3). The R1 and R2 ports of the two-position five-way directional valve (2) are connected to the outside. The hydraulic output end of the booster pump (3) is connected to the rod chamber of the hydraulic cylinder (4).

2. The nozzle assembly backing force device for an injection molding machine as described in claim 1, characterized in that: The rodless chamber of the hydraulic cylinder (4) is provided with a return spring (5) for piston rod return.

3. A nozzle assembly backing device for an injection molding machine as described in claim 1 or 2, characterized in that: There are two sets of hydraulic cylinders (4), which are arranged in parallel to each other, and the nozzle assembly (1) is arranged between the two sets of hydraulic cylinders (4).

4. The nozzle assembly backing force device for an injection molding machine as described in claim 1, characterized in that: A pressure sensor (6) is installed on the pipeline between the hydraulic output end of the booster pump (3) and the rod chamber of the hydraulic cylinder (4).

5. The nozzle assembly backing force device for an injection molding machine as described in claim 1, characterized in that: A proportional pressure regulating valve (7) for adjusting gas pressure is provided between the two-position five-way reversing valve (2) and the external gas source.

6. The nozzle assembly backing force device for an injection molding machine as described in claim 5, characterized in that: It also includes a two-position three-way reversing valve (8), the P port of which is connected to an external air source, the A port of which is connected to the P port of a two-position five-way reversing valve (2), and the R port of which is connected to the outside.

7. The nozzle assembly backing force device for an injection molding machine as described in claim 6, characterized in that: A filter (9) is provided between port A of the two-position three-way reversing valve (8) and port P of the two-position five-way reversing valve (2).

8. The nozzle assembly backing force device for an injection molding machine according to claim 7, characterized in that: A pressure reducing valve (10) is provided between the filter (9) and the P port of the two-position five-way reversing valve (2).

9. The nozzle assembly backing force device for an injection molding machine as described in claim 8, characterized in that: A pressure gauge (11) is provided between the pressure reducing valve (10) and the P port of the two-position five-way directional valve (2).

10. The nozzle assembly backing force device for an injection molding machine as described in claim 1, characterized in that: The two-position five-way directional valve (2) is a two-position five-way solenoid directional valve.

Images