Lifting hydraulic system for AGV (Automatic Guided Vehicle) die changing trolley

Abstract

The utility model relates to the technical field of lifting of a die changing trolley, and particularly discloses a lifting hydraulic system for an AGV die changing trolley, which comprises a power module, a shunting module and a driving module, the driving module comprises a plurality of lifting oil cylinders, piston rods of the plurality of lifting oil cylinders are all connected with the die changing trolley, and the lifting oil cylinders are connected with the power module. The flow dividing module comprises a proportional electromagnetic valve and a plurality of first flow dividing and collecting valves, each first flow dividing and collecting valve is provided with two oil outlets, the two oil outlets of each first flow dividing and collecting valve communicate with rodless cavities of the two lifting oil cylinders correspondingly, and therefore the power module can be connected with the first flow dividing and collecting valves through the proportional electromagnetic valve. Hydraulic oil is evenly distributed into rodless cavities of the multiple lifting oil cylinders through the multiple first flow distributing and collecting valves, it is guaranteed that the multiple lifting oil cylinders act synchronously, then the lifting stability of the die changing trolley is guaranteed, and due to the fact that the hydraulic oil is evenly distributed, the action of the lifting oil cylinders is not affected by unbalance loading.

Description

Technical Field

[0001] The utility model relates to the technical field of the lifting of die-changing trolleys, and particularly refers to a lifting hydraulic system for an AGV die-changing trolley. Background Art

[0002] The lifting oil cylinders of the die-changing trolley are the main actuating elements for lifting the die-changing trolley. During the process of replacing the injection mold, whether the die-changing trolley lifts smoothly, is positioned accurately, and is level after lifting affects whether the mold can be replaced smoothly. Therefore, how to accurately and smoothly control the synchronous lifting of the four lifting oil cylinders of the die-changing trolley is the main factor to ensure the smooth replacement of the mold.

[0003] In the prior art, generally, a hydraulic synchronous motor is used to control the synchronous movement of four hydraulic oil cylinders. However, there are still the following problems. For example, the hydraulic synchronous motor belongs to open-loop control, so the error of the hydraulic synchronous motor will increase with the different loads of the hydraulic cylinders. Therefore, the synchronous performance is unstable. In addition, there is wear during the use of the synchronous motor, which will also increase the error. At the same time, there is the disadvantage of weak anti-offset load ability. Summary of the Invention

[0004] The utility model is made in consideration of the foregoing problems. The purpose of the utility model is to provide a lifting hydraulic system for an AGV die-changing trolley, which has good synchronization of four lifting oil cylinders and good anti-offset load ability.

[0005] To achieve the above purpose, the utility model provides a lifting hydraulic system for an AGV die-changing trolley, which includes a power module, a flow splitting module, and a driving module. The driving module includes a plurality of lifting oil cylinders, and the piston rods of the plurality of lifting oil cylinders are all connected to the die-changing trolley to drive the die-changing trolley to perform lifting movement;

[0006] The flow splitting module includes a proportional solenoid valve and several first flow splitting and collecting valves. Each first flow splitting and collecting valve is provided with two oil outlets, and the two oil outlets of the first flow splitting and collecting valve are respectively communicated with the rodless cavities of two lifting oil cylinders. The power module is connected to several first flow splitting and collecting valves through the proportional solenoid valve, and evenly distributes hydraulic oil into the rodless cavities of a plurality of lifting oil cylinders through several first flow splitting and collecting valves.

[0007] For the above-mentioned lifting hydraulic system for an AGV die-changing trolley, the flow splitting module further includes a second flow splitting and collecting valve. The second flow splitting and collecting valve is located between the proportional solenoid valve and the first flow splitting and collecting valve, and the second flow splitting and collecting valve is provided with two oil outlets. The two oil outlets of the second flow splitting and collecting valve are respectively communicated with the oil inlets of two first flow splitting and collecting valves.

[0008] As described above, a lifting hydraulic system for an AGV die-changing trolley, wherein four lifting cylinders are provided, and the four lifting cylinders are respectively located at the four corners of the die-changing trolley, two first flow dividers and collectors are provided, and one second flow divider and collector is provided.

[0009] As described above, a lifting hydraulic system for an AGV die-changing trolley, wherein the driving module further includes a pressure maintaining valve, and the pressure maintaining valve is located between the rodless cavity of the lifting cylinder and the first flow divider and collector.

[0010] As described above, a lifting hydraulic system for an AGV die-changing trolley, wherein the pressure maintaining valve is a check valve, and the opening of the check valve faces the rodless cavity of the lifting cylinder.

[0011] As described above, a lifting hydraulic system for an AGV die-changing trolley, wherein the power module includes an oil tank, a motor pump unit and a unloading valve, the motor pump unit is located between the oil tank and the proportional solenoid valve, the oil outlet of the motor pump unit is communicated with the oil inlet of the proportional solenoid valve through a first pipeline, and the unloading valve is located on one side of the first pipeline.

[0012] As described above, a lifting hydraulic system for an AGV die-changing trolley, wherein the power module further includes a safety valve, the safety valve is located on one side of the first pipeline and is arranged in parallel with the unloading valve.

[0013] The utility model has the following beneficial effects:

[0014] 1. By using the first flow divider and collector and the second flow divider and collector to evenly distribute the hydraulic oil, it can ensure that the hydraulic oil entering each lifting cylinder is the same, that is, it will not be affected by eccentric load, thereby ensuring the synchronization of multiple lifting cylinders, and the die-changing trolley lifts more smoothly;

[0015] 2. The proportional solenoid valve can accurately control the hydraulic flow rate, thereby realizing the precise control of the lifting of the die-changing trolley and having a higher positioning accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall oil circuit of the embodiment.

[0017] In the figure:

[0018] 1. Power module; 11. Oil tank; 12. Motor pump unit; 13. Unloading valve; 14. Safety valve;

[0019] 2. Flow dividing module; 21. Proportional solenoid valve; 22. First flow divider and collector; 23. Second flow divider and collector;

[0020] 3. Driving module; 31. Lifting cylinder; 32. Pressure maintaining valve. Detailed implementation mode

[0021] The following are specific embodiments of the present utility model. In combination with the accompanying drawings, the technical solutions of the present utility model will be further described, but the utility model is not limited to these embodiments.

[0022] As Figure 1 shown, a lifting hydraulic system for an AGV die-changing trolley includes a power module 1, a flow splitting module 2, and a driving module 3.

[0023] Among them, the driving module 3 includes a plurality of lifting cylinders 31. The piston rods of the plurality of lifting cylinders 31 are all connected to the die-changing trolley to drive the die-changing trolley to perform lifting motion. It is required that the plurality of lifting cylinders 31 act synchronously. In order to achieve the synchronous action of the plurality of lifting cylinders 31, the flow splitting module 2 includes a proportional solenoid valve 21 and a plurality of first flow splitting and collecting valves 22. Each first flow splitting and collecting valve 22 is provided with two oil outlets, and the two oil outlets of the first flow splitting and collecting valve 22 are respectively communicated with the rodless cavities of two lifting cylinders 31. Then, one first flow splitting and collecting valve 22 can evenly distribute the obtained hydraulic oil into the rodless cavities of the two lifting cylinders 31 to drive the two lifting cylinders 31 to perform synchronous action. The power module 1 can be connected to a plurality of first flow splitting and collecting valves 22 through the proportional solenoid valve 21, and evenly distribute the hydraulic oil into the rodless cavities of the plurality of lifting cylinders 31 through the plurality of first flow splitting and collecting valves 22, ensuring the synchronous action of the plurality of lifting cylinders 31, thereby ensuring the smoothness of the lifting of the die-changing trolley. Moreover, since the hydraulic oil is evenly distributed, the action of the lifting cylinders 31 will not be affected by eccentric loads. Its hydraulic flow rate is controlled by the proportional solenoid valve 21, and its control accuracy is relatively high, which can ensure the positioning accuracy of the die-changing trolley.

[0024] In this embodiment, there are four lifting cylinders 31, and the four lifting cylinders 31 are respectively located at the four corners of the die-changing trolley. Then, two first flow splitting and collecting valves 22 are required. In order to evenly supply oil to the two first flow splitting and collecting valves 22, the flow splitting module 2 further includes a second flow splitting and collecting valve 23. The second flow splitting and collecting valve 23 is located between the proportional solenoid valve 21 and the first flow splitting and collecting valve 22, and the second flow splitting and collecting valve 23 is provided with two oil outlets. The two oil outlets of the second flow splitting and collecting valve 23 are respectively communicated with the oil inlets of the two first flow splitting and collecting valves 22. Then, only one second flow splitting and collecting valve 23 is needed. The hydraulic oil first flows into the second flow splitting and collecting valve 23 through the proportional solenoid valve 21, is evenly divided into two parts by the second flow splitting and collecting valve 23, then flows into the two first flow splitting and collecting valves 22, and is evenly divided into four parts by the two first flow splitting and collecting valves 22 and respectively flows into the four lifting cylinders 31.

[0025] When the lifting oil cylinder 31 is in a hovering state, in order to stabilize the oil pressure in the rodless cavity of the oil pressure, the driving module 3 further includes a pressure maintaining valve 32. The pressure maintaining valve 32 is located between the rodless cavity of the lifting oil cylinder 31 and the first flow dividing and collecting valve 22. The pressure maintaining valve 32 is set as a one-way valve, and the opening of the one-way valve faces the rodless cavity of the lifting oil cylinder 31. Then, when the lifting oil cylinder 31 is in a hovering state, the hydraulic oil in the rodless cavity will impact the pressure maintaining valve 32. However, due to its one-way flow, it can prevent the hydraulic oil in the rodless cavity from leaking, thereby ensuring the stability of the oil pressure in the rodless cavity and avoiding jitter.

[0026] Among them, the power module 1 includes an oil tank 11, a motor pump unit 12, and a unloading valve 13. The motor pump unit 12 is located between the oil tank 11 and the proportional solenoid valve 21. The oil outlet of the motor pump unit 12 is communicated with the oil inlet of the proportional solenoid valve 21 through a first pipeline. The unloading valve 13 is located on one side of the first pipeline, that is, the hydraulic oil in the oil tank 11 is pumped into the proportional solenoid valve 21 through the motor pump unit 12, and the unloading valve 13 is used to control the oil pressure. When the oil pressure is too high and pressure relief is required, the unloading valve 13 can be opened for pressure relief.

[0027] In order to ensure safety performance, the power module 1 further includes a safety valve 14. The safety valve 14 is located on one side of the first pipeline and is arranged in parallel with the unloading valve 13. When the oil pressure in the first pipeline reaches the maximum pressure threshold, the safety valve 14 is opened under the action of pressure for automatic pressure relief to avoid too high oil pressure.

[0028] The technical solutions of the present invention have been described in detail above in conjunction with the accompanying drawings. The described embodiments are used to help understand the idea of the present invention. The specific embodiments described herein are only examples of the spirit of the present invention. Those skilled in the technical field to which the present invention belongs can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0029] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0030] In addition, in the present invention, descriptions such as "first", "second", "one", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0031] In the present utility model, unless otherwise clearly stipulated and defined, terms such as "connection" and "fixation" shall be understood in a broad sense. For example, "fixation" may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0032] In addition, the technical solutions between various embodiments of the present utility model can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

Claims

1. A lifting hydraulic system for an AGV die-changing trolley, characterized in that, It includes a power module, a flow splitting module and a driving module. The driving module includes a plurality of lifting cylinders, and the piston rods of the plurality of lifting cylinders are all connected to the die-changing trolley to drive the die-changing trolley to perform lifting motion; The flow splitting module includes a proportional solenoid valve and several first flow splitting and collecting valves. Each of the first flow splitting and collecting valves is provided with two oil outlets, and the two oil outlets of the first flow splitting and collecting valve are respectively communicated with the rodless cavities of two of the lifting cylinders. The power module is connected to the several first flow splitting and collecting valves through the proportional solenoid valve, and evenly distributes hydraulic oil to the rodless cavities of the plurality of lifting cylinders through the several first flow splitting and collecting valves.

2. The lifting hydraulic system for an AGV die-changing trolley according to claim 1, characterized in that, The flow splitting module further includes a second flow splitting and collecting valve. The second flow splitting and collecting valve is located between the proportional solenoid valve and the first flow splitting and collecting valve, and the second flow splitting and collecting valve is provided with two oil outlets. The two oil outlets of the second flow splitting and collecting valve are respectively communicated with the oil inlets of two of the first flow splitting and collecting valves.

3. The lifting hydraulic system for an AGV die-changing trolley according to claim 2, characterized in that, There are four lifting cylinders, and the four lifting cylinders are respectively located at the four corners of the die-changing trolley. There are two first flow splitting and collecting valves and one second flow splitting and collecting valve.

4. The lifting hydraulic system for an AGV die-changing trolley according to claim 1, characterized in that, The driving module further includes a pressure maintaining valve, and the pressure maintaining valve is located between the rodless cavity of the lifting cylinder and the first flow splitting and collecting valve.

5. The lifting hydraulic system for an AGV die-changing trolley according to claim 4, characterized in that, The pressure maintaining valve is set as a one-way valve, and the opening of the one-way valve faces the rodless cavity of the lifting cylinder.

6. The lifting hydraulic system for an AGV die-changing trolley according to claim 1, wherein, The power module includes an oil tank, a motor pump set and a unloading valve. The motor pump set is located between the oil tank and the proportional solenoid valve. The oil outlet of the motor pump set is communicated with the oil inlet of the proportional solenoid valve through a first pipeline, and the unloading valve is located on one side of the first pipeline.

7. The lifting hydraulic system for the AGV die-changing trolley according to claim 6, characterized in that, The power module further includes a safety valve. The safety valve is located on one side of the first pipeline and is arranged in parallel with the unloading valve.

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