In the field of machining, surface grinding machine is an important processing equipment, and its motion control has a crucial impact on machining accuracy and efficiency. Among them, the hydraulic transmission reversing technology is one of the key technologies to realize the precise control of surface grinding machine. This paper will discuss several common methods of hydraulic transmission commutation for surface grinding machine.

1. The reversing method of the stroke reversing valve is adopted

The stroke reversing valve realizes automatic reversing by pushing the pull rod on the reversing valve core through the stroke stop on the work table. When the table moves slowly, once the reversing valve reaches the middle position, regardless of the oil circuit status of the left and right chambers of the hydraulic cylinder, the movement of the table will stop because there is no liquid pressure to push the two chambers of the hydraulic cylinder, forming the so-called "dead point". Therefore, this method may have a short pause when reversing, but it is used more in small grinding machines.

Second, the use of electromagnetic reversing valve reversing method

The electromagnetic reversing valve sends the reversing signal through the stroke stop to push the stroke switch, and then the slide valve is reversed by the electromagnet action. This method can effectively prevent the occurrence of "dead point" phenomenon, but because the electromagnetic reversing valve is a switch type hydraulic valve, its reversing will produce a large impact, which may affect the accuracy and life of the machine tool.

Third, the use of electro-hydraulic reversing valve reversing method

In order to reduce the reversing impact and improve the reversing accuracy, the electro-hydraulic reversing valve can be used for reversing. The electro-hydraulic directional valve is composed of the pilot valve electromagnetic slide valve and the main valve hydraulic slide valve. The hydraulic slide valve of the main valve is controlled by the electromagnetic action of the pilot valve. This method combines the advantages of electromagnetic reversing valve and hydraulic reversing valve, which can realize fast reversing, reduce reversing impact and improve reversing accuracy.

In summary, there are many ways for surface grinding machines to carry out hydraulic transmission reversal, and each method has its own applicable scenarios and advantages and disadvantages. In practical applications, it is necessary to choose the appropriate commutation method according to the specific processing requirements, machine tool performance and processing accuracy.