Hydraulic control system and extruding machine

Abstract

The utility model discloses a hydraulic control system and an extruding machine, which are applied to the extruding machine and comprise an oil tank assembly, an oil pump unit, a plurality of oil cylinders and a reversing valve group, the oil pump unit is connected with the oil tank assembly; the oil cylinder is provided with a piston rod cavity and a piston cavity; the reversing valve set is provided with a first connecting port connected to an outlet of the oil pump unit, a second connecting port connected to all the piston cavities and a third connecting port connected to part of the piston rod cavities. When the hydraulic control system controls the plurality of oil cylinders to push, oil is supplied to all piston cavities of the plurality of oil cylinders at the same time, enough thrust to the push plate is improved, when the oil cylinders are in a retreating state, oil is supplied to piston rod cavities of part of the oil cylinders at the same time, the oil supply speed is higher, the retreating running speed of the middle plate is improved, the non-extrusion time of the extruder is shortened, and therefore the yield is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of extruders, and particularly relates to a hydraulic control system and an extruder. Background Art

[0002] In traditional extruders, as one of the key components, the middle plate oil cylinder is responsible for pushing the middle plate to move forward and backward to achieve precise control during the extrusion process. Due to design reasons, these 4 oil cylinders usually adopt a synchronous drive method, that is, they receive the forward or backward instructions simultaneously and execute simultaneously, resulting in a slow speed during the operation of the middle plate oil cylinder. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a hydraulic control system and an extruder to solve one or more technical problems existing in the prior art, and at least provide a beneficial choice or create conditions.

[0004] The technical solution adopted to solve the above technical problems:

[0005] The utility model provides a hydraulic control system applied to an extruder, which includes an oil tank assembly, an oil pump unit, a plurality of oil cylinders, and a reversing valve group; the oil pump unit is connected to the oil tank assembly; the oil cylinder is provided with a piston rod chamber and a piston chamber; the reversing valve group has a first connection port connected to the outlet of the oil pump unit, a second connection port connected to all the piston chambers, and a third connection port connected to a part of the piston rod chambers, and the reversing valve group is configured to control the first connection port and the second connection port to communicate with each other or the first connection port and the third connection port to communicate with each other.

[0006] The beneficial effect of the utility model is:

[0007] When the hydraulic control system controls the pushing of a plurality of oil cylinders, it is divided into the forward state and the backward state of the oil cylinders. When a plurality of oil cylinders move forward, the oil pump unit controls the first connection port and the second connection port to communicate through the reversing valve group, that is, supplies oil to all the piston chambers of a plurality of oil cylinders simultaneously, so as to provide sufficient thrust for the push plate. When the oil cylinders are in the backward state, the oil pump unit controls the first connection port and the third connection port to communicate through the reversing valve group, that is, supplies oil to the piston rod chambers of some oil cylinders simultaneously, with a faster oil supply speed, which improves the running speed of the middle plate when it moves backward, shortens the non-extrusion time of the extruder, and thus improves the output.

[0008] As a further improvement of the above technical solution, the reversing valve group further has a fourth connection port connected to the fuel tank assembly. The reversing valve group is configured to control the mutual communication of the first connection port, the second connection port, the third connection port, and the fourth connection port. The reversing valve group has a forward control state and a reverse control state. In the forward control state, the oil in both the third connection port and the first connection port flows to the second connection port. In the reverse control state, the oil in both the second connection port and the first connection port flows to the third connection port or the fourth connection port.

[0009] In the forward control state, the oil cylinder is in the forward working state. By using the pressure difference with the piston rod cavity, the oil in the piston rod cavity is replenished into the piston cavity to form a differential action, accelerating the forward speed of the oil cylinder. In the reverse control state, the piston rod cavity is supplied with oil, and at the same time, the piston cavity returns oil.

[0010] As a further improvement of the above technical solution, the reversing valve group further has a fifth connection port connected to the remaining piston rod cavity. The reversing valve group is configured to control the mutual communication of the first connection port, the second connection port, the third connection port, and the fifth connection port. In the forward control state, the oil in the third connection port, the first connection port, and the fifth connection port all flows to the second connection port. In the reverse control state, the oil in the second connection port and the first connection port both flows to the third connection port.

[0011] At this time, in the forward control state, the oil cylinder is in the forward working state, and the oil in the remaining piston rod cavity can also flow to the piston cavity, that is, the pressure difference replenishes the oil in the piston rod cavity into the piston cavity to form a differential action, accelerating the forward speed of the oil cylinder.

[0012] As a further improvement of the above technical solution, the hydraulic control system further includes a make-up valve group. The make-up valve group is connected to the remaining part of the piston rod cavity and the fuel tank assembly. When the oil cylinder is in the retracted state, the remaining part of the piston rod cavity does not provide power for oil inlet. Therefore, in order to avoid vacuum, oil is often replenished from the fuel tank to the remaining part of the piston rod cavity through the make-up component.

[0013] As a further improvement of the above technical solution, the make-up valve group includes an eleventh hydraulic check valve and a tenth hydraulic check valve. Setting two hydraulic valves enables smooth oil replenishment even in the case of a small pressure difference.

[0014] As a further improvement of the above technical solution, the hydraulic control system further includes a relief valve group. The relief valve group is connected to the oil pump unit. When the pressure in the system exceeds the set value, the valve automatically opens to allow the excess liquid to flow back to the fuel tank assembly, thereby maintaining the pressure stability of the hydraulic system.

[0015] As a further improvement of the above technical solution, the overflow valve group includes a twelfth solenoid valve, a first overflow valve, and a thirteenth hydraulic check valve.

[0016] As a further improvement of the above technical solution, the directional valve group includes a first hydraulic valve, a second hydraulic valve, a third hydraulic valve, a fourth hydraulic valve, a fifth hydraulic valve, a sixth hydraulic valve, a seventh two-position four-way solenoid valve, an eighth two-position four-way solenoid valve, a ninth two-position four-way solenoid valve, a second overflow valve, and a third overflow valve.

[0017] As a further improvement of the above technical solution, the hydraulic control system further includes a control oil pump group, and the control oil pump group is connected to the directional valve group.

[0018] The present utility model also provides an extruder, which is characterized by including the hydraulic control system described in any one of the above. Due to the hydraulic control system of the present utility model provided in the extruder, the retraction running speed of the middle plate is increased, the non-extrusion time of the extruder is shortened, and thus the output is improved. Description of the Drawings

[0019] The following further describes the present utility model in conjunction with the drawings and embodiments;

[0020] Figure 1 It is a hydraulic schematic diagram of an embodiment of a hydraulic control system provided by the present utility model. Detailed Embodiment

[0021] This part will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the drawings. The role of the drawings is to supplement the description of the text part of the specification, enabling people to visually and vividly understand each technical feature and the overall technical solution of the present utility model, but it cannot be understood as a limitation on the protection scope of the present utility model.

[0022] In the description of the present utility model, it should be understood that for the orientation description, such as the upper, lower, front, rear, left, right, etc., the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model.

[0023] In the description of the present utility model, if there are descriptions with words such as "several", its meaning is one or more, and the meaning of multiple is more than two. Understanding of greater than, less than, exceeding, etc. does not include the present number, and understanding of above, below, within, etc. includes the present number.

[0024] In the description of the present utility model, unless otherwise clearly defined, terms such as "arrangement", "installation", and "connection" shall be understood in a broad sense, and those skilled in the relevant technical field can reasonably determine the specific meanings of the above terms in the present utility model in combination with the specific content of the technical solution.

[0025] Referring to Figure 1 , a hydraulic control system and an extruder of the present utility model are provided, and the following embodiments are made:

[0026] A hydraulic control system is applied to an extruder and includes a fuel tank assembly 100, an oil pump unit 200, four oil cylinders 300, a reversing valve group 400, and a control oil pump group;

[0027] The oil pump unit 200 includes a fixed-displacement hydraulic pump, a fourteenth hydraulic check valve, and a pressure gauge. The inlet end of the fixed-displacement hydraulic pump is connected to the fuel tank assembly 100, the outlet end of the fixed-displacement hydraulic pump is connected to the inlet end of the fourteenth hydraulic check valve, and the control end of the fourteenth hydraulic check valve is connected to the outlet end of the oil pump unit 200.

[0028] Among the four oil cylinders 300, the oil cylinder 300 is provided with a piston rod chamber and a piston chamber;

[0029] The control oil pump group includes a hydraulic pump and a plurality of check valves. The hydraulic pump is respectively connected to the fuel tank assembly 100 and the check valves.

[0030] The reversing valve group 400 has a first connection port connected to the outlet of the oil pump unit 200, a second connection port connected to all the piston chambers, a third connection port connected to a part of the piston rod chambers, a fourth connection port connected to the fuel tank assembly 100, and a fifth connection port connected to the remaining piston rod chambers. The reversing valve group 400 has a forward control state and a backward control state.

[0031] The reversing valve group 400 includes a first hydraulic valve, a second hydraulic valve, a third hydraulic valve, a fourth hydraulic valve, a fifth hydraulic valve, a sixth hydraulic valve, a seventh two-position four-way solenoid valve, an eighth two-position four-way solenoid valve, a ninth two-position four-way solenoid valve, a second overflow valve, and a third overflow valve.

[0032] It should be noted that the first end, second end, and third end of the hydraulic valves in this application are named from left to right in the order of the attached drawings.

[0033] The first end of the first hydraulic valve is the first connection port. The second end of the first hydraulic valve is connected to the second connection port and the first end of the fourth hydraulic valve. The third end of the first hydraulic valve is connected to the first end of the second hydraulic valve. The control end of the first hydraulic valve is connected to the seventh two-position four-way solenoid valve;

[0034] The first end of the fourth hydraulic valve is connected to the second end of the first hydraulic valve and the second connection port. The second end of the fourth hydraulic valve is connected to the first end of the fifth hydraulic valve. The control end of the fourth hydraulic valve is connected to the seventh two-position four-way solenoid valve and the eighth two-position four-way solenoid valve.

[0035] The first end of the fifth hydraulic valve is connected to the second end of the fourth hydraulic valve. The second end of the fifth hydraulic valve is connected to the second end of the second hydraulic valve and the third connection port. The third end of the fifth hydraulic valve is connected to the first end of the sixth hydraulic valve. The control end of the fifth hydraulic valve is connected to the eighth two-position four-way solenoid valve. The second relief valve is respectively connected to the first end and the control end of the fifth hydraulic valve.

[0036] The first end of the second hydraulic valve is connected to the second end of the first hydraulic valve. The second end of the second hydraulic valve is connected to the second end of the fifth hydraulic valve and the third connection port. The control end of the second hydraulic valve is connected to the eighth two-position four-way solenoid valve.

[0037] The first end of the sixth hydraulic valve is connected to the third end of the fifth hydraulic valve. The second end of the sixth hydraulic valve is connected to the second end of the third hydraulic valve and the fifth connection port. The third end of the sixth hydraulic valve is connected to the fourth connection port. The control end of the sixth hydraulic valve is connected to the ninth two-position four-way solenoid valve. The third relief valve is respectively connected to the control end of the sixth hydraulic valve and the first end of the sixth hydraulic valve.

[0038] For the connection modes of the seventh two-position four-way solenoid valve, the eighth two-position four-way solenoid valve, and the ninth two-position four-way solenoid valve, refer to Appendix Figure 1 .

[0039] When the hydraulic control system controls the pushing of multiple cylinders 300, it is divided into the forward state of the cylinders 300 and the retraction state of the cylinders 300. Corresponding to this, the reversing valve group 400 has a forward control state and a backward control state. When multiple cylinders 300 move forward, the oil pump unit 200 controls the first connection port and the second connection port to be connected through the reversing valve group 400, that is, supplies oil to all the piston chambers of multiple cylinders 300 simultaneously, so as to provide sufficient thrust for the push plate. When the cylinders 300 are in the retraction state, the oil pump unit 200 controls the first connection port and the third connection port to be connected through the reversing valve group 400, that is, supplies oil to the piston rod chambers of some cylinders 300 simultaneously. The oil supply speed is faster, the running speed of the middle plate during retraction is increased, the non-extrusion time of the extruder is shortened, and thus the output is increased.

[0040] Moreover, in the forward control state, the cylinders 300 are in the forward working state, and the oil in the piston rod chamber is supplemented to the piston chamber by using the pressure difference with the piston rod chamber to form a differential action, which speeds up the forward speed of the cylinders 300. In the backward control state, the piston rod chamber is supplied with oil, and at the same time, the piston chamber returns oil.

[0041] Meanwhile, in the forward control state, the oil cylinder 300 is in the forward working state, and the oil in the remaining piston rod chamber can also flow to the piston chamber. That is, the pressure difference replenishes the oil in the piston rod chamber to the piston chamber to form a differential action, accelerating the forward speed of the oil cylinder 300.

[0042] That is, in the extrusion press of the present utility model, there are four oil cylinders 300 with the code 15 for the middle plate. In traditional extrusion presses, the four oil cylinders 300 move forward and backward together, resulting in a slow speed during the operation of the middle plate oil cylinder 300. It is changed to make the four oil cylinders 300 for the middle plate cylinder perform differential actions when moving forward, and two oil cylinders 300 are used to move backward when retreating, improving the running speed of the middle plate, shortening the non-extrusion time of the extrusion press, and thus increasing the output. Through differential connection, the present utility model can achieve rapid feeding of the oil cylinder 300 without increasing the flow rate of the fixed-displacement hydraulic pump, improving the production and processing efficiency. And by setting the oil to flow into the piston rod chambers of the two oil cylinders 300, the retraction speed of the oil cylinder 300 is accelerated, shortening the non-extrusion time of the extrusion press, and thus increasing the output.

[0043] For further improvement, the hydraulic control system further includes a supplementary oil valve group 500. The supplementary oil valve group 500 is connected to the remaining part of the piston rod chamber and the fuel tank assembly 100. When the oil cylinder 300 is in the retraction state, the remaining part of the piston rod chamber does not provide power for oil inlet. Therefore, in order to avoid vacuum, oil is supplemented from the fuel tank to the remaining part of the piston rod chamber through the supplementary oil assembly.

[0044] The supplementary oil valve group 500 includes an eleventh hydraulic check valve and a tenth hydraulic check valve. By setting two hydraulic valves, smooth oil supplementation can still be achieved under the condition of a small pressure difference.

[0045] For further improvement, the hydraulic control system further includes a relief valve group 600. The relief valve group 600 is connected to the oil pump unit 200. When the pressure in the system exceeds the set value, the valve is automatically opened to make the excess liquid flow back to the fuel tank assembly 100, thereby maintaining the pressure stability of the hydraulic system.

[0046] The relief valve group 600 includes a twelfth solenoid valve, a first relief valve, and a thirteenth hydraulic check valve.

[0047] Action description: 1. When the oil cylinder 300 moves forward, the seventh two-way four-way solenoid valve, the eighth two-way four-way solenoid valve, the ninth two-way four-way solenoid valve, and the twelfth two-way four-way solenoid valve are energized to supply oil to the piston chamber of the oil cylinder 300. At the same time, the fourth hydraulic valve, the fifth hydraulic valve, and the sixth hydraulic valve are closed, and the pressure difference between the piston chamber and the piston rod chamber is used to replenish the oil in the piston rod chamber to the piston chamber to form a differential action, accelerating the forward speed of the oil cylinder 300.

[0048] 2. When the oil cylinder 300 retracts, the eighth two-position four-way solenoid valve and the ninth two-position four-way solenoid valve are energized, supplying oil to the piston rod chambers of the two oil cylinders 300. At the same time, the fourth hydraulic valve, the fifth hydraulic valve, and the sixth hydraulic valve in the piston chamber are opened to allow the piston chamber to return oil. The two middle plate oil cylinders 300 retract, and the eleventh hydraulic check valve and the tenth hydraulic check valve are opened to suck oil through the oil storage tank to supply oil to the piston rod chambers of the other two oil cylinders 300 to prevent the formation of a vacuum.

[0049] In some other embodiments, the reversing valve group 400 is configured to control the first connection port and the second connection port to communicate with each other or the first connection port and the third connection port to communicate with each other. The piston rod chamber and the piston chamber are respectively provided with oil outlets connected to the fuel tank assembly 100.

[0050] At this time, when the hydraulic control system controls the multiple oil cylinders 300 to push, it is divided into the forward state of the oil cylinder 300 and the retraction state of the oil cylinder 300. When the multiple oil cylinders 300 advance, the oil pump unit 200 controls the first connection port and the second connection port to communicate through the reversing valve group 400, that is, simultaneously supplying oil to all the piston chambers of the multiple oil cylinders 300 to provide sufficient thrust to the push plate. When the oil cylinder 300 is in the retraction state, the oil pump unit 200 controls the first connection port and the third connection port to communicate through the reversing valve group 400, that is, simultaneously supplying oil to the piston rod chambers of some oil cylinders 300. The oil supply speed is faster, improving the running speed of the middle plate retraction, shortening the non-extrusion time of the extruder, and thus increasing the output.

[0051] The present invention also provides an embodiment of an extruder, including the hydraulic control system described in any one of the above. Since the extruder is provided with the hydraulic control system of the present invention, the four oil cylinders 300 of the middle plate perform differential actions when advancing, and two oil cylinders 300 retract when retracting, improving the running speed of the middle plate, shortening the non-extrusion time of the extruder, and thus increasing the output. Through differential connection, the present invention can achieve rapid feeding of the oil cylinder 300 without increasing the flow rate of the hydraulic pump, improving the production and processing efficiency.

[0052] The above has specifically described the preferred embodiments of the present invention, but the present invention is not limited to the embodiments. Those skilled in the art can make various equivalent variations or substitutions without departing from the spirit of the present invention, and these equivalent variations or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A hydraulic control system, applied to an extruder, characterized in that: include: Fuel tank assembly; An oil pump unit connected to the oil tank assembly; A plurality of oil cylinders, each of which is provided with a piston rod cavity and a piston cavity; The reversing valve group has a first connection port connected to the outlet of the oil pump unit, a second connection port connected to all the piston chambers, and a third connection port connected to a part of the piston rod chambers. The reversing valve group is configured to control the first connection port, the second connection port or the first connection port and the third connection port to be connected to each other.

2. A hydraulic control system according to claim 1, characterized in that: The reversing valve group also has a fourth connection port connected to the oil tank assembly. The reversing valve group is configured to control the first connection port, the second connection port, the third connection port, and the fourth connection port to be connected to each other. The reversing valve group has a forward control state and a reverse control state. The forward control state is that the oil in the third connection port and the first connection port both flows to the second connection port, and the reverse control state is that the oil in the second connection port and the first connection port both flows to the third connection port or the fourth connection port.

3. A hydraulic control system according to claim 2, characterized in that: The reversing valve group also has a fifth connection port connected to the remaining piston rod chamber. The reversing valve group is configured to control the first connection port, the second connection port, the third connection port, and the fifth connection port to be connected to each other. In the forward control state, the oil in the third connection port, the first connection port, and the fifth connection port all flow to the second connection port. In the backward control state, the oil in the second connection port and the first connection port all flow to the third connection port.

4. A hydraulic control system according to claim 1, characterized in that: The hydraulic control system further comprises an oil replenishing valve group, and the oil replenishing valve group is communicated with the remaining piston rod chamber and the oil tank assembly.

5. A hydraulic control system according to claim 4, characterized in that: The oil replenishment valve group includes an eleventh hydraulic one-way valve and a tenth hydraulic one-way valve.

6. A hydraulic control system according to claim 1, characterized in that: The hydraulic control system further comprises a relief valve group, and the relief valve group is connected to the oil pump unit.

7. A hydraulic control system according to claim 6, characterized in that: The overflow valve group includes a twelfth solenoid valve, a first overflow valve, and a thirteenth hydraulic one-way valve.

8. A hydraulic control system according to claim 1, characterized in that: The reversing valve group includes a first hydraulic valve, a second hydraulic valve, a third hydraulic valve, a fourth hydraulic valve, a fifth hydraulic valve, a sixth hydraulic valve, a seventh two-position four-way solenoid valve, an eighth two-position four-way solenoid valve, a ninth two-position four-way solenoid valve, a second overflow valve and a third overflow valve.

9. A hydraulic control system according to claim 1, characterized in that: The hydraulic control system further comprises a control oil pump group, and the control oil pump group is connected to the reversing valve group.

10. An extruder, characterized in that: A hydraulic control system comprising any one of claims 1 to 9.

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