Hydraulic counterweights for high-speed reciprocating components

Abstract

The invention discloses a hydraulic counter weight device applied to a high-speed reciprocating motion component. The hydraulic counter weight device comprises a driving cylinder and a driven cylinder, which are filled with media and are fixed on a stand; a piston rod of the driving cylinder is connected with a reciprocating motion component driven by a power source through a connection piece, and a piston rod of the driven cylinder is connected with a counter weight; a first connection pipe is connected with cylinder tubes at the rodless ends of the driving and driven cylinders, and media filled in the first connection pipe flow in the cylinder tubes at the rodless ends of the two work cylinders; a second connection pipe is connected with cylinder tubes at the rod ends of the driving and driven cylinders, and media filled in the second connection pipe flow in the cylinder tubes at the rod ends of the two work cylinders; and the counter weight is driven to do reciprocating motion opposite to the piston rod of the driving cylinder by the media filled in the cylinder tubes at the rod ends of the driving and driven cylinders. The hydraulic counter weight device has the advantages that weight-loss sides are forced to move synchronously, and the weight loss of a counter weight side and the instability of a system during working are completely avoided by virtue of incompressibility and rigidity transmission force of the media filled in the cylinder tubes of the driving and driven cylinders.

Description

technical field [0001] The invention relates to a balance weight device of mechanical equipment, in particular to a hydraulic counterweight device for high-speed reciprocating parts. Background technique [0002] In the machinery industry, in order to balance the weight of vertical (or inclined) high-speed reciprocating parts and reduce the transmission power, counterweight balancing devices of various structural forms are often used. However, the commonly used ordinary balance devices are often connected by chains or wire ropes. When the acceleration of the active part is greater than the acceleration of gravity, the phenomenon of "weightlessness" of the counterweight will occur, resulting in unstable operation of the entire system. [0003] In view of the above reasons, at present, mechanical equipment with high-speed movement and frequent reversing such as CNC honing machines does not use a balance weight device. In order to overcome the gravity and inertia of the vertica...

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Problems solved by technology

However, commonly used ordinary balance devices are often connected by chains or wire ropes. When the acceleration of the active part is greater than the acceleration of gravity, the phenomenon of "weightlessness" of the counterweight will occur, resulting in unstable operation of the entire system.

[0003] In view of the above reasons, at present, mechanical equipment with high-speed movement and frequent reversing such as CNC honing machines does not use a balance weight device. In order to overcome the gravity and inertia of the vertical moving parts, a larger drive motor is used. The main reason is The following points: 1. Since vertical motion requires high acceleration (greater than 1g) and frequent reversing (vertical motion reversing up to 100 times / minute or more), the parts are required to have high fatigue impact strength and For a long replacement cycle, the ordinary balance device uses a wire rope-pulley device or a chain-sprocket device to suspend the balance weight. The structure is complex and huge, and it is difficult to adopt due to the limited overall structural space of the machine; 2. Due to the active movement of the CNC honing machine The acceleration of the component (such as the main shaft) when reversing often exceeds the acceleration of gravity by 1g. The acceleration of the counterweight that relies on gravity to fall is the acceleration of gravity. When the acceleration accelerates to synchronize with the active components, it will cause an impact on the active components such as the spindle instantaneously. When the numerical control system is used to encode tens of thousands to millions of pulses per revolution, this impact will make the control out of step and the system unstable.

If the counterweight is forced to synchronize with the active parts, it will be very difficult due to the limitation of the whole machine structure

3. Since high-speed vertical motion requires high acceleration (greater than 1g) and frequent reversing (vertical motion reversing up to 100 times / minute or more), in view of the sensitivity of steel wire rope or chain to alternating stress impact, it is required that steel wire rope or The chain is used as a balance connector, and its short service life obviously cannot meet the requirements

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