Suction pad

1 . A suction pad comprising: a body; and a sponge member,

wherein the body includes a negative pressure chamber, and a plurality of communication passages configured to communicate with the negative pressure chamber, and the sponge member includes a plurality of cavities configured to open toward a workpiece and communicate with the negative pressure chamber through the communication passages,

a flow passage adjustment valve configured to adjust a flow passage area is disposed in each of the communication passages, and when vacuum pressure is generated in the negative pressure chamber and a cavity among the plurality of cavities is not closed by the workpiece, a flow passage area of a communication passage among the communication passages that corresponds to the cavity that is not closed by the workpiece is adjusted to be decreased,

the suction pad further comprises a pressure detection port configured to detect pressure in at least one cavity among the plurality of cavities,

wherein:

the body includes a detection passage configured to communicate with a corresponding one of the cavities of the sponge member,

the detection passage vertically passes through the body, and

an end of the detection passage forms the pressure detection port.

2 . The suction pad according to claim 1 , wherein

the pressure detection port is disposed near a center of each of four sides of an upper surface of the body.