An ultrasonic apparatus, comprising movable elements (2, 3), body portions (1, 2), a freely adjustable horizontal movement assembly (4), and a freely adjustable vertical movement assembly (5, 8, 9, 100). The freely adjustable horizontal movement assembly (4) and the freely adjustable vertical movement assembly (5, 8, 9, 100) are connected between the body portions (1, 2) and the movable elements (2, 3). The freely adjustable horizontal movement assembly (4) comprises a first connecting rod (41), a second connecting rod (42), a third connecting rod (43) and a fourth connecting rod (44) that are sequentially hinged to one another in an end to end manner. As the freely adjustable horizontal movement assembly (4) and the freely adjustable vertical movement assembly (5, 8, 9, 100) are connected between the body portions (1, 2) and the movable elements (2, 3), the movable elements (2, 3) can move in horizontal, vertical or combined horizontal and vertical directions with respect to the body portions (1, 2). Further, the adopted freely adjustable horizontal movement assembly (4) comprises four connecting rods (41, 42, 43, 44) in which two of four hinged connections are movably connected to the body portions (1, 2) and two to the movable elements (2, 3) respectively, such that the movable elements (2, 3) have a large movement range and can move to any position. Further, as the movable elements (2, 3) are connected to the body portions (1, 2) by means of two pairs of double connecting rods, the stability and flexibility of movement are increased.L'invention concerne un appareil à ultrasons qui comporte des éléments mobiles (2, 3), des parties corps (1, 2), un ensemble de déplacement horizontal pouvant être réglé librement (4), et un ensemble de déplacement vertical pouvant être réglé librement (5, 8, 9, 100). L'ensemble de déplacement horizontal pouvant être réglé librement (4) et l'ensemble de déplacement vertical pouvant être réglé librement (5, 8, 9, 100) sont reliés entr
