Oil cylinder driving structure of injection molding machine

Abstract

The utility model relates to an oil cylinder driving structure of an injection molding machine, which comprises a mounting seat, and a main cylinder body is arranged on the mounting seat; the main cylinder bodies are symmetrically arranged on the two sides of the installation base, the auxiliary cylinder bodies are further arranged on the installation base, and piston rods of the main cylinder bodies are parallel to piston rods of the auxiliary cylinder bodies. The interiors of the main cylinder body and the auxiliary cylinder body are divided into a first oil cavity and a second oil cavity which are not communicated with each other by respective piston rods; a first oil hole is formed in the outer side wall of the first oil cavity, a second oil hole is formed in the outer side wall of the second oil cavity, a first oil pipe is connected to the first oil hole, and a second oil pipe is connected to the second oil hole; an oil outlet of the second oil pipe is connected into the oil storage tank, and an oil quantity control valve is arranged on the first oil pipe. The device has the advantages of being high in response speed, more stable in operation and long in service life.

Description

Technical Field

[0001] This application relates to the technical field of injection molding machine cylinders, and in particular to a cylinder drive structure for an injection molding machine. Background Art

[0002] At present, the cylinders of injection molding machines mainly play the role of converting liquid high-pressure oil into mechanical energy, and are responsible for driving various moving parts of the injection molding machine, such as mold opening, injection, mold closing, demolding, etc. Among them, the injection cylinder of the injection molding machine is mainly used to drive the plasticizing screw into and out of the barrel. During operation, oil is synchronously and alternately fed and drained into and out of the oil inlet and outlet of the injection cylinder to drive the piston rod to slide in the injection cylinder. Since all the hydraulic oil in the rodless cavity of the injection cylinder needs to be discharged during injection, and the amount of oil is large and the oil resistance is also large, the resistance to be overcome during the injection action is also large, resulting in a slow response speed. At the same time, the reaction force received by the piston rod is also large, which is easy to cause an impact on the cylinder and affect its service life. Utility Model Content

[0003] This application provides a cylinder drive structure for an injection molding machine, which has the effects of fast response speed, more stable operation, and long service life.

[0004] The cylinder drive structure for an injection molding machine provided by this application adopts the following technical solutions:

[0005] A cylinder drive structure for an injection molding machine includes a mounting seat, and a main cylinder body is arranged on the mounting seat; the main cylinder bodies are symmetrically arranged on both sides of the mounting seat, and an auxiliary cylinder body is also arranged on the mounting seat. The piston rods of the main cylinder bodies are parallel to each other; the interiors of the main cylinder body and the auxiliary cylinder body are separated by their respective piston rods into non-communicating first oil chambers and second oil chambers; a first oil hole is opened on the outer side wall of the first oil chamber, and a second oil hole is opened on the outer side wall of the second oil chamber. A first oil pipe is connected to the first oil hole, and a second oil pipe is connected to the second oil hole; the oil outlet of the second oil pipe is connected to the inside of an oil storage tank, and an oil quantity control valve is arranged on the first oil pipe.

[0006] Preferably, the first oil pipes connect the respective first oil holes in sequence.

[0007] Preferably, the second oil pipes connect the respective second oil holes in sequence.

[0008] Preferably, a return oil pipe is communicated with the oil storage tank, and the return oil pipe is connected to the first oil pipe.

[0009] Preferably, the auxiliary cylinder bodies are symmetrically arranged on both sides of the mounting seat, and the main cylinder bodies and the auxiliary cylinder bodies on the same side of the mounting seat are arranged in sequence in the same direction.

[0010] Preferably, connecting seats are arranged on the outer side walls on the same side of the main cylinder block and the auxiliary cylinder block, and the same baffle is installed outside each connecting seat.

[0011] Preferably, internal threaded holes are arranged on the side walls of the connecting seats facing the baffle, fasteners are arranged on the baffle in one-to-one correspondence with the internal threaded holes, and the fasteners are used to be screwed into the internal threaded holes to screw and fix the baffle outside each connecting seat.

[0012] In summary, the present application includes at least one of the following beneficial technical effects:

[0013] Through the second oil pipe, the hydraulic oil in the second oil chamber can be discharged into the oil storage tank in time, so as to ensure that the second oil chamber remains in an empty state; when injecting glue, oil is supplied to the first oil chamber through the first oil pipe, so that the resistance suffered by the piston rod when sliding towards the direction close to the second oil chamber during glue injection can be greatly reduced, the response speed is further improved, and at the same time the reaction force received by the piston rod is also reduced, reducing the impact on the inner walls of the main cylinder block and the auxiliary cylinder block, so that the service life of the main cylinder block and the auxiliary cylinder block can be further improved; the auxiliary cylinder block can further assist the main cylinder block to push the melting screw to move together, ensuring the stability of the melting screw during movement;

[0014] Through the oil return pipe, the hydraulic oil in the oil storage tank can be recycled, realizing the recycling of the hydraulic oil, which is more energy-saving and environment-friendly;

[0015] Under the action of the baffle, the stability and reliability of the main cylinder block and the auxiliary cylinder block on the same side of the mounting seat can be further improved. Description of the Drawings

[0016] Figure 1 is a partial structural schematic diagram of Embodiment 1 of the present application;

[0017] Figure 2 is a partial structural sectional schematic diagram of Embodiment 1 of the present application;

[0018] Figure 3 is a partial structural sectional schematic diagram of Embodiment 1 of the present application highlighting the oil return hole and the oil extraction pipe;

[0019] Figure 4 is a partial structural schematic diagram of Embodiment 2 of the present application.

[0020] Description of the reference numerals: 1, mounting seat; 2, main cylinder block; 3, auxiliary cylinder block; 4, first oil chamber; 40, first oil hole; 41, first oil pipe; 5, second oil chamber; 50, second oil hole; 51, second oil pipe; 52, oil return hole; 53, oil extraction pipe; 6, oil storage tank; 60, oil return pipe; 7, oil quantity control valve; 8, connecting seat; 80, baffle; 81, internal threaded hole; 82, fastener. Detailed Description of the Invention

[0021] The present application will be further described in detail below with reference to the accompanying drawings.

[0022] An embodiment of the present application discloses an oil cylinder drive structure of an injection molding machine. Embodiment

[0023] Refer to Figure 1 、 Figure 2 As shown in

[0024] 、 Figure 1 、 Figure 2 the oil cylinder drive structure of the injection molding machine includes a mounting seat 1 for fixedly mounting on the machine table. A main cylinder body 2 with a horizontally arranged piston rod is fixedly mounted on the mounting seat 1. The main cylinder bodies 2 are symmetrically arranged on the left and right sides of the mounting seat 1. A plurality of auxiliary cylinder bodies 3 are also fixedly mounted on the mounting seat 1. The piston rods of the main cylinder body 2 and the auxiliary cylinder bodies 3 are parallel to each other, and the piston rods of the main cylinder body 2 and the auxiliary cylinder bodies 3 are both used for connecting and fixing with the injection seat of the melting screw, and synchronously driving the melting screw to enter and withdraw from the barrel.

[0025] As shown in Figure 1 、 Figure 2 the inside of the main cylinder body 2 and the auxiliary cylinder bodies 3 is divided by their respective piston rods into two non - communicating first oil chambers 4 and second oil chambers 5. A first oil hole 40 communicating with the first oil chamber 4 is opened on the outer side wall of the first oil chamber 4, and a second oil hole 50 communicating with the second oil chamber 5 is opened on the bottom outer side wall of the second oil chamber 5.

[0026] The hydraulic oil in the second oil chamber 5 can be timely discharged into the storage tank 6 through the second oil pipe 51, so as to ensure that the second oil chamber 5 remains in an empty state. When injecting glue, oil is supplied to the first oil chamber 4 through the first oil pipe 41. Since the second oil chamber 5 is in an empty state at this time, the resistance suffered by the piston rod when sliding towards the direction close to the second oil chamber 5 during injection can be greatly reduced, the response speed of the piston rod is improved, and at the same time the reaction force received by the piston rod will also be reduced, reducing the impact on the inner walls of the main cylinder body 2 and the auxiliary cylinder bodies 3, and improving the service life of the main cylinder body 2 and the auxiliary cylinder bodies 3. In addition, the auxiliary cylinder bodies 3 can assist the main cylinder body 2 to push the injection seat of the melting screw to move together, ensuring that a sufficient large thrust can be applied to the injection seat of the melting screw, improving the stability when the injection seat moves, and making the force on the injection seat more uniform and reliable.

[0027] As shown in Figure 1 、Figure 2 As shown, the first oil pipe 41 sequentially connects each first oil hole 40 on the main cylinder block 2 and the auxiliary cylinder block 3, and the second oil pipe 51 sequentially connects each second oil hole 50 on the main cylinder block 2 and the auxiliary cylinder block 3. A return oil pipe 60 is also provided on the oil storage tank 6. One end of the return oil pipe 60 is connected to the oil pump provided in the oil storage tank 6, and the other end of the return oil pipe 60 is connected to the first oil pipe 41. Synchronous oil supply and oil discharge are carried out to the first oil pipe 41 through the same return oil pipe 60, so as to ensure the consistency of the piston rod actions of the main cylinder block 2 and the auxiliary cylinder block 3.

[0028] As Figure 1 、 Figure 2 shown, when the injection molding seat of the melting plastic screw is reset under the drive of an external drive source, since the piston rods of the main cylinder block 2 and the auxiliary cylinder block 3 are both connected and fixed to the injection molding seat of the melting plastic screw, when the injection molding seat is reset, it will drive the piston rods of the main cylinder block 2 and the auxiliary cylinder block 3 to achieve synchronous reset. During this process, the oil quantity control valve 7 will control the opening of the first oil pipe 41, and the hydraulic oil in the first oil cavity 40 will flow back to the oil storage tank 6 through the first oil pipe 41.

[0029] As Figure 3 shown, oil return holes 52 communicating with the second oil cavity 5 are reserved on both the main cylinder block 2 and the auxiliary cylinder block 3. The oil return holes 52 are used to connect the oil suction pipes 53. By blocking the second oil holes 50, at this time, by the synchronous and alternating oil supply and oil discharge of the first oil pipe 41 and the oil suction pipes 53, the piston rod can also be driven to slide. Embodiment

[0030] An oil cylinder drive structure of an injection molding machine, referring to Figure 4 , the difference from Embodiment 1 is that:

[0031] Connecting seats 8 are fixedly arranged on the outer side walls on the same side of the main cylinder block 2 and the auxiliary cylinder block 3. The same baffle 80 is detachably installed outside each connecting seat 8. An internal thread hole 81 is provided on the side wall of the connecting seat 8 facing the baffle 80. Fasteners 82 are arranged on the baffle 80 in one-to-one correspondence with the internal thread holes 81. The fasteners 82 are used to be screwed into the internal thread holes 81 and screw the baffle 80 tightly and fixedly outside each connecting seat 8. Under the blocking of the baffle 80, the connection strength between the main cylinder block 2 and the auxiliary cylinder block 3 on the same side can be further improved, ensuring the overall stability and reliability of the main cylinder block 2 and the auxiliary cylinder block 3.

[0032] The implementation principle is as follows: Through the second oil pipe 51, the hydraulic oil in the second oil chamber 5 can be discharged into the oil storage tank 6 in time, so as to ensure that the second oil chamber 5 remains in an empty state. When injecting glue, oil is supplied to the first oil chamber 4 through the first oil pipe 41. Since the second oil chamber 5 is in an empty state at this time, the resistance suffered by the piston rod when sliding in the direction close to the second oil chamber 5 during glue injection can be greatly reduced, further improving the response speed. At the same time, the reaction force received by the piston rod will also decrease accordingly, reducing the impact on the inner walls of the main cylinder block 2 and the auxiliary cylinder block 3, so as to further improve the service life of the main cylinder block 2 and the auxiliary cylinder block 3. The auxiliary cylinder block 3 can further assist the main cylinder block 2 to push the sliding seat of the melting screw together, ensuring the stability of the melting screw during movement.

[0033] Through the return oil pipe 60, the hydraulic oil in the oil storage tank 6 can be recycled, realizing the recycling of hydraulic oil and being more energy-saving and environmentally friendly. Under the action of the baffle 80, the stability and reliability of the main cylinder block 2 and the auxiliary cylinder block 3 on the same side of the mounting seat 1 can be further improved.

[0034] The above are all the preferred embodiments of this application, and the protection scope of this application is not limited by this. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. An oil cylinder driving structure of an injection molding machine, comprising a mounting seat (1), and a main cylinder body (2) is arranged on the mounting seat (1); characterized in that: The main cylinder block (2) is symmetrically arranged on both sides of the mounting base (1). A secondary cylinder block (3) is also arranged on the mounting base (1). The piston rods of the main cylinder block (2) and the secondary cylinder block (3) are parallel to each other. Inside the main cylinder block (2) and the secondary cylinder block (3), the respective piston rods divide them into a non-communication first oil chamber (4) and a second oil chamber (5). A first oil hole (40) is provided on the outer side wall of the first oil chamber (4), and a second oil hole (50) is provided on the outer side wall of the second oil chamber (5). A first oil pipe (41) is connected to the first oil hole (40), and a second oil pipe (51) is connected to the second oil hole (50). The oil outlet of the second oil pipe (51) is connected to the inside of an oil storage tank (6). An oil quantity control valve (7) is provided on the first oil pipe (41).

2. The oil cylinder drive structure of the injection molding machine according to claim 1, characterized in that: The first oil pipe (41) sequentially connects each of the first oil holes (40).

3. The oil cylinder drive structure of the injection molding machine according to claim 2, characterized in that: The second oil pipe (51) sequentially connects each of the second oil holes (50).

4. The oil cylinder drive structure of the injection molding machine according to claim 2, characterized in that: An oil return pipe (60) is communicated with the oil storage tank (6), and the oil return pipe (60) is connected to the first oil pipe (41).

5. The oil cylinder drive structure of the injection molding machine according to claim 1, characterized in that: The secondary cylinder block (3) is symmetrically arranged on both sides of the mounting base (1), and the main cylinder block (2) and the secondary cylinder block (3) on the same side of the mounting base (1) are sequentially arranged in the same direction.

6. The oil cylinder drive structure of the injection molding machine according to claim 5, characterized in that: Connection seats (8) are provided on the outer side walls of the same side of the main cylinder block (2) and the secondary cylinder block (3), and the outside of each of the connection seats (8) is mounted with the same baffle plate (80).

7. The oil cylinder drive structure of the injection molding machine according to claim 6, characterized in that: Internal threaded holes (81) are provided on the side walls of the connection seats (8) facing the baffle plate (80). Fasteners (82) corresponding to the internal threaded holes (81) one by one are penetrated through the baffle plate (80). The fasteners (82) are used to be screwed into the internal threaded holes (81) to screw and fix the baffle plate (80) outside each of the connection seats (8).

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