Dual hydraulic safety circuit of vertical turntable injection molding machine

Abstract

The utility model relates to the technical field of injection molding machines, and provides a dual hydraulic safety circuit of a vertical turntable injection molding machine. An oil inlet of the oil pump is connected with the oil tank through a pipeline; an oil inlet of the safety valve is connected with an oil outlet of the oil pump through a pipeline I; an oil inlet of the electromagnetic reversing valve is connected with an oil outlet of the safety valve through a pipeline II; and an oil inlet of the safety valve is connected with an oil outlet of the electromagnetic directional valve through a pipeline III. The two safety valves are connected to the working oil port of the electromagnetic reversing valve, so that the mold locking oil cylinder can be switched between high pressure and reset actions, the effect of a hydraulic double-loop structure is achieved, the design of an oil way is simple and convenient, the operation amount of pipe distribution is reduced, the action cycle of the system is shortened, and the through-flow capacity of the system is greatly enhanced; the leakage rate and the use cost of the system are reduced, and the convenience of later maintenance of the system is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding machines, in particular to a double hydraulic safety circuit of a vertical turntable injection molding machine. Background Art

[0002] Injection molding machines, also known as injection molding machines or injection machines, are the primary molding equipment used to create various shapes of plastic products from thermoplastics or thermosetting plastics using plastic molding molds. They are available in vertical, horizontal, and all-electric models. They heat the plastic and apply high pressure to the molten plastic, causing it to be ejected and fill the mold cavity.

[0003] The known authorized patent application number is: CN202223028769.3, which discloses a hydraulic safety circuit for the pressing cylinder of a BMC injection molding machine. Its background technology raises the problem that "because the pressing device is installed in a vertical direction, when the pressing device is shut down for maintenance and upkeep, the piston rod of the pressing cylinder is subjected to the dual effects of pressure and gravity, and there is a risk of falling and injuring people." Therefore, the technical solution to this problem is "including: a system oil port, a solenoid directional valve, a hydraulically controlled one-way valve, a first stop valve, a second stop valve, a pressing cylinder and an oil tank, and the solenoid directional valve is provided with a first oil port and a second oil port , the first electromagnet and the second electromagnet. When the pressing device needs to be maintained or serviced, the first electromagnet and the second electromagnet on the electromagnetic directional valve are both de-energized. In this state, the first stop valve and the second stop valve can be manually opened to relieve the pressure in the rodless chamber and the rod chamber of the pressing oil cylinder. After the pressure relief is completed, the first stop valve and the second stop valve are manually closed to avoid the malfunction of the piston rod downward caused by the internal pressure. At the same time, the hydraulic control one-way valve can block the hydraulic oil in the rod chamber of the pressing oil cylinder from leaking through the first oil port of the electromagnetic directional valve, avoiding the malfunction of the piston rod downward due to gravity, and the overall safety performance is good.

[0004] However, in the implementation of relevant technologies, it was found that the existing technical solutions have the following problems: the existing vertical injection molding machine clamping circuit is generally complex in structure and has many system components, which easily leads to a series of problems. For example, the system has many action steps, resulting in a long action cycle and easily increasing the leakage of the system. In addition, it also makes the oil circuit block design cumbersome, the pipe laying work workload is large, the maintenance machine operator has high requirements for quality, and the system maintenance is also troublesome. Utility Model Content

[0005] The utility model proposes a dual hydraulic safety circuit for a vertical turntable injection molding machine, which solves the problems in the related art that the structure is generally complex and the system components are numerous, which easily lead to a series of problems. In addition, the oil circuit block design is cumbersome, the pipe laying operation is labor-intensive, the quality requirements for machine maintenance operators are high, and the system maintenance is also troublesome.

[0006] The technical solution of the utility model is as follows: a dual hydraulic safety circuit of a vertical turntable injection molding machine, comprising: an oil tank; an oil pump, the oil inlet of the oil pump is connected to the oil tank through a pipeline; a safety valve, the oil inlet of the safety valve is connected to the oil outlet of the oil pump through pipeline one; an electromagnetic reversing valve, one oil inlet of the electromagnetic reversing valve is connected to the oil outlet of the safety valve through pipeline two; the safety valve, the oil inlet of the safety valve is connected to an oil outlet of the electromagnetic reversing valve through pipeline three; and a clamping cylinder, the clamping cylinder is respectively connected to the safety valve and the electromagnetic reversing valve.

[0007] Preferably, the locking cylinder includes a rod chamber and a rodless chamber, the oil outlet of the safety valve is connected to the rodless chamber through pipeline four, the other oil outlet of the electromagnetic reversing valve is connected to the rod chamber through pipeline five, and the oil return port of the electromagnetic reversing valve is connected to the oil tank through pipeline six.

[0008] Preferably, it further comprises: an electric motor, wherein the output end of the electric motor is connected to the oil pump and is used to drive the oil pump to operate.

[0009] Preferably, it further comprises: a relief valve, wherein the relief valve is arranged on pipeline one and connected to the oil outlet of the oil pump, and the oil outlet of the relief valve is connected to the oil tank through pipeline seven.

[0010] The working principle and beneficial effects of the utility model are as follows:

[0011] When in use, two safety valves are connected to the working oil port of the electromagnetic reversing valve to switch the clamping cylinder between high pressure and reset action, thereby realizing the effect of hydraulic dual-circuit structure, making the oil circuit design simple, reducing the workload of pipe laying and the system's action cycle, greatly enhancing the system's flow capacity, reducing the system's leakage and use cost, and effectively improving the convenience of the system's later maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0013] Figure 1 This is a schematic diagram of the overall planar structure of the utility model;

[0014] In the figure: 1. Oil tank; 2. Oil pump; 3. Electric motor; 4. Safety valve R1; 5. Overflow valve R3; 6. Solenoid reversing valve V1; 7. Safety valve R2; 8. Clamping cylinder C; 9. Rod chamber C1; 10. Rodless chamber C2. DETAILED DESCRIPTION

[0015] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0016] Example

[0017] See also Figure 1 The utility model provides a dual hydraulic safety circuit of a vertical turntable injection molding machine, comprising: an oil tank 1; an oil pump 2, the oil inlet of the oil pump 2 being connected to the oil tank 1 through a pipeline; a safety valve R-4, the oil inlet of the safety valve R-4 being connected to the oil outlet of the oil pump 2 through pipeline 1; an electromagnetic reversing valve V-6, an oil inlet of the electromagnetic reversing valve V-6 being connected to the oil outlet of the safety valve R-4 through pipeline 2; a safety valve R-7, the oil inlet of the safety valve R-7 being connected to an oil outlet of the electromagnetic reversing valve V-6 through pipeline 3; and a clamping cylinder C8, the clamping cylinder C8 being connected to the safety valve R-7 and the electromagnetic reversing valve V-6, respectively.

[0018] The clamping cylinder C8 includes a rod chamber C-9 and a rodless chamber C-10. The oil outlet of the safety valve R-7 is connected to the rodless chamber C-10 through pipeline 4. The other oil outlet of the electromagnetic reversing valve V-6 is connected to the rod chamber C-9 through pipeline 5. The oil return port of the electromagnetic reversing valve V-6 is connected to the oil tank 1 through pipeline 6.

[0019] The technical solution provided by this embodiment is as follows: when the system is pressurized, the oil in the oil tank 1 is extracted by starting the oil pump 2, and the oil is input into the safety valve R-4 through the pipeline 1. At the same time, the safety valve R-4 is energized, and all its oil ports are connected with the oil inlet of the electromagnetic reversing valve V-6. At this time, the oil is connected from the left position D1 of the electromagnetic reversing valve V-6 through the pipeline 2, and input into the safety valve R-7 through the pipeline 3. The safety valve R-7 is energized, and all its oil ports are connected with the rodless cavity C-10 of the clamping cylinder C8, so that the pressure oil is delivered into the rodless cavity C-10 of the clamping cylinder C8, thereby causing the clamping cylinder C8 to operate and extend. During reset, the solenoid directional control valve V-6 is reversed, so that the oil is connected through the right position D2 and input into the rod chamber C-9 of the clamping cylinder C8 through pipeline five. The oil in the rodless chamber C-10 of the clamping cylinder C8 flows back to the safety valve R-7. At the same time, the safety valve R-7 is energized, and all its oil ports are connected to the return oil port of the solenoid directional control valve V-6, so that the oil flows back to the oil tank 1 through pipeline six. Therefore, the safety valve R-4 and the safety valve R-7 are used to achieve the effect of the hydraulic dual-circuit structure, which makes the oil circuit design simple, reduces the workload of pipe layout and the system's action cycle, greatly enhances the system's flow capacity, reduces the system's leakage and use cost, and effectively improves the convenience of the system's later maintenance.

[0020] Furthermore, it also includes: an electric motor 3, the output end of the electric motor 3 is connected to the oil pump 2, and is used to drive the oil pump 2 to operate.

[0021] Specifically, by providing the electric motor 3 , the oil pump 2 can be driven to operate so as to facilitate the transportation and flow of oil.

[0022] Furthermore, it also includes: a relief valve R35, which is arranged on pipeline 1 and connected to the oil outlet of the oil pump 2, and the oil outlet of the relief valve R35 is connected to the oil tank 1 through pipeline 7.

[0023] Specifically, through the setting of the relief valve R35, when the pressure output by the oil pump 2 exceeds a preset value, the relief valve R35 opens and allows the excess oil to flow back into the oil tank 1 through the pipeline 7, so as to keep the system pressure stable within a safe range and avoid damage caused by excessive pressure, thereby protecting the oil pump 2 and the entire hydraulic system.

[0024] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A dual hydraulic safety circuit for a vertical turntable injection molding machine, characterized in that: include: Fuel tank (1); An oil pump (2), wherein an oil inlet of the oil pump (2) is connected to the oil tank (1) via a pipeline; A safety valve R1 (4), the oil inlet of the safety valve R1 (4) is connected to the oil outlet of the oil pump (2) through a pipeline 1; An electromagnetic reversing valve V1 (6), wherein an oil inlet of the electromagnetic reversing valve V1 (6) is connected to an oil outlet of the safety valve R1 (4) via a second pipeline; Safety valve R2 (7), the oil inlet of the safety valve R2 (7) is connected to an oil outlet of the electromagnetic reversing valve V1 (6) through pipeline 3; The mold locking cylinder C (8) is connected to the safety valve R2 (7) and the electromagnetic reversing valve V1 (6) respectively.

2. The dual hydraulic safety circuit of a vertical turntable injection molding machine according to claim 1, characterized in that: The clamping cylinder C (8) includes a rod chamber C1 (9) and a rodless chamber C2 (10), the oil outlet of the safety valve R2 (7) is connected to the rodless chamber C2 (10) through a pipeline four, the other oil outlet of the electromagnetic reversing valve V1 (6) is connected to the rod chamber C1 (9) through a pipeline five, and the oil return port of the electromagnetic reversing valve V1 (6) is connected to the oil tank (1) through a pipeline six.

3. The dual hydraulic safety circuit of a vertical turntable injection molding machine according to claim 1, characterized in that: Also includes: An electric motor (3) has an output end connected to the oil pump (2) and is used to drive the oil pump (2) to operate.

4. The dual hydraulic safety circuit of a vertical turntable injection molding machine according to claim 1, characterized in that: Also includes: Overflow valve R3 (5), the overflow valve R3 (5) is arranged on pipeline 1 and connected to the oil outlet of the oil pump (2), and the oil outlet of the overflow valve R3 (5) is connected to the oil tank (1) through pipeline 7.

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