阅读说明：本技术 冲孔设备的液压驱动系统 (Hydraulic driving system of punching equipment ) 是由 C·L·巴图 R·巴塔利亚 于 2019-09-30 设计创作，主要内容包括：液压驱动系统(1),其与多压力机冲孔设备(50)相关联,用于沿着相应的工作轴线(A)以单独且独立的方式操作多个冲孔工具(51),该液压驱动系统包括多个液压缸(2),每个液压缸均与相应的冲孔工具(51)相关联,并设有相应的活塞(21),该活塞在液压缸(2)内限定了推力室(22)和返回室(23),并且与相应的冲孔工具(51)相关联,以使冲孔工具(51)沿工作轴线(A)移动；可逆型第一泵(3),其连接到推力室(22),并被布置为至少在其中一个所述推力室(22)中以供应压力(P-A)输送油,从而沿着工作方向推动相应的活塞(21),并允许与之相关的冲孔工具(51)与工件(100)相互作用,或者至少从所述推力室(22)中抽吸油,以使相应的活塞(21)沿返回方向移动,并将冲孔工具(51)从工件(100)上分离并移除；多个换向阀(4),每个换向阀与相应的液压缸(2)相关联,介于第一泵(3)和推力室(22)之间,可启动打开以连接第一泵(3)和推力室(22),以操作液压缸(2)；液压蓄能器(5),其连接到返回室(23),并被布置为在所述返回室(23)中将油保持在确定的预载压力下。(Hydraulic drive system (1) associated with a multi-press punching apparatus (50) for operating a plurality of punching tools (51) in a single and independent manner along respective working axes (A), comprising a plurality of hydraulic cylinders (2), each associated with a respective punching tool (51) and provided with a respective piston (21) defining a thrust chamber (22) and a return chamber (23) within the hydraulic cylinder (2) and associated with the respective punching tool (51) to cause the punching tools (5) to operate in a single and independent manner1) Moving along a working axis (a); a first pump (3) of the reversible type, connected to the thrust chambers (22) and arranged to supply a pressure (P) at least in one of said thrust chambers (22) A ) -feeding oil so as to push the respective piston (21) along the working direction and allow the punching tool (51) associated therewith to interact with the workpiece (100), or at least to suck oil from said thrust chamber (22), so as to move the respective piston (21) along the return direction and to separate and remove the punching tool (51) from the workpiece (100); a plurality of directional valves (4), each of which is associated with a respective hydraulic cylinder (2), interposed between the first pump (3) and the thrust chamber (22), and can be actuated open to connect the first pump (3) and the thrust chamber (22) to operate the hydraulic cylinder (2); a hydraulic accumulator (5) connected to the return chamber (23) and arranged to keep the oil at a determined preload pressure in said return chamber (23).)

1. Hydraulic drive system (1) associated with a multi-press punching apparatus (50) for operating a plurality of punching tools (51) of said punching apparatus (50) in a separate and independent manner along respective working axes (a) so as to interact with a workpiece (100), comprising:

-a plurality of hydraulic cylinders (2), each associated with a respective punching tool (51) and provided with a respective piston (21), the pistons (21) defining, inside the hydraulic cylinders (2), a thrust chamber (22) and a return chamber (23) and being associated with the respective punching tool (51) to move the punching tools (51) along respective working axes (a);

-a first pump (3) of the reversible type, connected to the thrust chambers (22) of the hydraulic cylinder (2) and arranged to supply a pressure (P) at least in one of the thrust chambers (22)_A) -feeding oil so as to push the respective piston (21) along a working direction and allow the punching tool (51) associated therewith to interact with the workpiece (100), or at least to suck oil from the thrust chamber (22), so as to move the respective piston (21) along a return direction, and the punching tool (51) is detached and removed from the workpiece (100);

-a plurality of directional control valves (4), each directional control valve being associated with a respective hydraulic cylinder (2), interposed between the first pump (3) and a thrust chamber (22) of the hydraulic cylinder (2), and being activatable to fluidically connect the first pump (3) with the thrust chamber (22) to operate the hydraulic cylinder (2);

-a hydraulic accumulator (5) connected to the return chamber (23) of the hydraulic cylinder (2) and arranged to keep the oil at a determined preload pressure in the return chamber (23), in particular to operate at least one piston (21) of the hydraulic cylinder (2) moving in the return direction by activating a respective reversing valve (4).

2. The hydraulic drive system (1) according to claim 1, comprising an electric motor (6) controlled by a control unit (10) and arranged to drive said first pump (3) of the reversible type in both directions of rotation, and in such a way as to determine a supply pressure (P)_A) Delivering a determined flow of oil.

3. The hydraulic drive system (1) according to claim 2, comprising a second pump (7) of the reversible type, coupled and connected to said first pump (3), said pumps (3, 7) being operated by the same electric motor (6) controlled by a control unit (10) and being arranged to drive said pumps (3, 7) in both directions of rotation, the pumps (3, 7) being such as to set a supply pressure (P)_A) Delivering a determined flow of oil.

4. The hydraulic drive system (1) of claim 3, comprising a first differential valve (8) interposed between the second pump (7) and the thrust chambers (22) and adapted to determine the supply pressure (P) in at least one of the thrust chambers (22)_A) Exceeds a first operating pressure (P)₁) Is activated in order to connect the second pump (7) to an oil reservoir (15), in particular the oil reservoir (15) is at atmospheric pressure.

5. The hydraulic drive system (1) of any one of the preceding claims, comprising a second differential valve (9) interposed between the hydraulic accumulator (5) and the return chamber (23) and which is responsive to the supply pressure (P) in at least one of the thrust chambers (22)_A) Exceeds the second operating pressure (P)₂) Is activated in order to connect the return chamber (23) to an oil reservoir (15), in particular the oil reservoir (15) is at atmospheric pressure.

6. The hydraulic drive system (1) according to claims 4 and 5, wherein said second working pressure (P)₂) Above said first working pressure (P)₁)。

7. The hydraulic drive system (1) of any one of the preceding claims, comprising an oil reservoir (15), at least the first pump (3) drawing oil from the oil reservoir (15) when the first pump is driven in a first rotational direction, in order to supply the oil at a supply pressure (P)_A) To the hydraulic cylinder (2) and to an oil reservoir (15) when the first pump (3) is driven in a second, opposite rotational direction to suck oil from the hydraulic cylinder (2).

8. Multi-press punching apparatus (50), the multi-press punching apparatus (50) comprising a hydraulic drive system (1) according to any one of the preceding claims for operating a plurality of punching tools (51) in a separate and independent manner along respective working axes (a).

9. A method for operating a plurality of punching tools (51) of a multi-press punching apparatus (50) having a hydraulic drive system (1) according to any of claims 1 to 7 in a separate and independent manner, the method comprising:

-selecting at least one punching tool (51) to be operated by activating a respective reversing valve (4) interposed between a first pump (3) and the hydraulic cylinder (2), the first pump (3) being of the reversible type and arranged to supply a pressure (P)_A) -feeding oil, a hydraulic cylinder (2) acting on the punching tool (51);

-driving the first pump (3) in a first direction of rotation so as to feed pressurized oil into the thrust chamber (22) of the hydraulic cylinder (2) so as to push its piston (21) in the working direction and enable the punching tool (51) associated therewith to perform a machining on a workpiece (100);

-upon said machining, driving said first pump (3) in a second opposite direction of rotation to suck oil from said thrust chamber (22), said piston (21) being pushed in the return direction by means of a hydraulic accumulator (5) delivering pressurized oil to a return chamber (23) of said hydraulic cylinder (1) to detach and remove said punching tool (51) from said workpiece (100).

10. Method according to claim 9, comprising, during said driving of said first pump (3), further driving a second pump (7) of the reversible type, in particular a second pump (7) coupled and connected with said first pump (3), in said first direction of rotation, so as to convey oil to a thrust chamber (22) until a first working pressure (P) is reached₁) When this pressure is exceeded, the second pump (7) is connected to the reservoir (15) by activating the first differential valve (8), the second pump (7) delivering oil into the oil reservoir (15).

11. Method according to claim 9 or 10, comprising, during said driving of said first pump (3), when said supply pressure (P) in said thrust chamber (22) is present_A) Exceeds the second operating pressure (P)₂) When this occurs, the return chamber (23) is connected to the oil reservoir (15) by actuating the second differential valve (9).