Hydraulic drive apparatus for a shaping machine

A hydraulic drive apparatus for a shaping machine, comprising:

• a first hydraulic pump,
• a drive motor connected to the first hydraulic pump by a drive shaft,
• a second hydraulic pump connected to the drive motor by the drive shaft,
• a consumer,
• a hydraulic line system connecting the first hydraulic pump and the second hydraulic pump to the consumer, the hydraulic line system including a first branch line connected to the first hydraulic pump, a second branch line connected to the second hydraulic pump, and a main line, wherein the first branch line and the second branch line both open into the main line,
• a closed-loop control unit for closed-loop control of the hydraulic drive apparatus, the closed-loop control unit including:
• a first switching element configured to change a displacement volume of the first hydraulic pump between a predetermined minimum value and a maximum value depending on a predetermined pressure threshold and/or a predetermined volume flow threshold, and
• a second switching element configured to change a displacement volume of the second hydraulic pump between a predetermined minimum value and a maximum value depending on a predetermined pressure threshold and/or a predetermined volume flow threshold.