Please select the most similar patent number from A, B, C and D. Which number is?
A fixing apparatus (100), comprising a base (10), at least one fixing mechanism (20), and at least one limiting mechanism (30). The base (10) comprises a base plate (11) and a fixing plate (13). Each fixing mechanism (20) comprises a fixing drive member (21), a moving member (22), and an abutting member (24); the fixing drive member (21) drives the moving member (22) to move so as to drive the abutting member (24) to abut against a workpiece (200). Each limiting mechanism (30) comprises a fixing member (31), a stopping member (33), and at least two limiting assemblies (32); each limiting assembly (32) comprises a limiting member (321), a limiting spring member (322), a snapping member (323), a snapping spring member (324), a control member (325), and a control spring member (326); the snapping member (323) comprises a push-pull part (3231) and a snapping part (3232). If the corresponding limiting member (321) is pressed to move, the snapping member (323) causes, under the action of the elastic force of the snapping spring member (324), the snapping part (3232) to be accommodated in a groove (3213) of the limiting member (321) to stop the snapping member (323) from moving, such that the snapping member (323) is accommodated in the fixing member (31). If the corresponding control member (325) is pressed to move, the push-pull part (3231) disengages from a receiving groove (3253) of the control member (325) to drive the snapping part (3232) to disengage from the groove (3213) of the limiting member (321), and the limiting member (321) moves to protrude out of the fixing plate (13) under the action of the snapping spring member (324) so as to stop the stopping member (33).
A: A nozzle fixing assembly (10) and an oral irrigator. The nozzle fixing assembly (10) is used for installing a nozzle (100). The nozzle (100) is provided with a limiting groove (130). The nozzle fixing assembly (10) comprises a locking unit (200) and a supporting base (300); the locking unit (200) comprises a housing (210) and an elastic element (230), wherein the housing (210) is provided with a through slot (211) which is arranged through two opposite sides of the housing (210), and wherein the elastic element (230) is connected to the housing (210); and the supporting base (300) comprises an elastic fastening (310) and a locking sleeve (320). The locking sleeve (320) is provided with a channel (321), a groove (322) is provided in the periphery of the locking sleeve (320), and the channel (321) is in communication with the groove (322). The nozzle (100) passes through the through slot (211) and the channel (321) and presses the elastic element (230); therefore, the limiting groove (130) is exposed in the groove (322), and the elastic fastening (310) is clamped in the limiting groove (130) and the groove (322). The nozzle (100) presses the elastic element (230) to adjust the assembling gap between the nozzle (100) and the supporting base (300), so that the limiting groove (130) is exposed in the groove (322), namely, the limiting groove (130) is aligned with the opening of the groove (322); at this moment, the elastic fastening (310) can be clamped in the limiting groove (130) and the groove (322); and therefore, the nozzle (100) and the supporting base (300) are assembled in place and stably installed.
B: A lamp comprising a lamp body (100) and an elastic mounting member (200), wherein the lamp body (100) comprises a lamp main body (110) and a limiting member (120), the limiting member (120) is connected to the lamp main body (110), a limiting space (130) is defined by the limiting member (120) and the lamp main body (110), a mounting opening is provided in one end of the limiting space (130), the limiting member (120) comprises a matching notch (123), the matching notch (123) is formed by extending towards the interior of the limiting member (120) from the mounting opening, a limiting groove (111) being in communication with the limiting space (130) is concavely provided in the lamp main body (110), the elastic mounting member (200) comprises a clamping part (210) and a mounting part (220), the clamping part (210) comprises a base body (211) and an elastic fastener (212), the elastic fastener (212) is elastically connected to the base body (211), one end of the base body (211) is bent outwards and extends to form the mounting part (220), the mounting part (220) is configured to be fixed to a mounting foundation (300), the clamping part (210) extends into the limiting space (130) from the mounting opening, the mounting part (220) extends into the matching notch (123), the base body (211) is in limiting fit with the lamp body (100) in the direction perpendicular to the extending direction of the clamping part (210), and the elastic fastener (212) is in limiting fit with the limiting groove (111) so as to limit the clamping part (210) being separated from the limiting space (130) from the mounting opening. The lamp is low in assembly difficulty and small in radial size.
C: A mounting mechanism, comprising a first part (1) and a second part (2) connected to the first part (1). The first part (1) comprises a connecting piece (11) and a limiting component (12). The limiting component (12) comprises a limiting housing (121), two grabbing arms (122) and a first return piece (123). The limiting housing (121) is provided with an opening at one end away from the connecting piece (11), and the two grabbing arms (122) are both hinged within the limiting housing (121). Each grabbing arm (122) is provided with a clamping part (1221) at one end close to the opening. The second part (2) comprises a head (21) and a connecting part (22) that extends from the head (21). The outer diameter of the connecting part (22) is smaller than that of the head (21), so that a step is formed at the joint between the head (21) and the connecting part (22). During mounting, the head (21) is operated to move from the opening to the limiting housing (121) through the space between the two clamping parts (1221), and the head (21) pushes the two clamping parts (1221) open so as to pass through, so that the first return piece (123) generates a driving force. When the head (21) passes through the clamping parts (1221), the first return piece (123) drives the two clamping parts (1221) to rotate and reset in opposite directions so as to clamp the head (21).
D: A positioning device (100), comprising a support frame (10), a rotating mechanism (20), a positioning mechanism (30), and a variable spacing mechanism (40). The rotating mechanism (20) is disposed on the support frame (10) and rotates the positioning mechanism (30). The positioning mechanism (30) comprises a base plate (31), a fixed tray (32), and at least one movable tray (34). The fixed tray (32) is fixedly disposed on the base plate (31). The at least one movable tray (34) is slidably disposed on the base plate (31) in sequence and is near the fixed tray (32). The variable distance mechanism (40) comprises a linear driving member (41), a sliding plate (43), and at least one connecting member (42). The linear driving member (41) is fixedly disposed on the base plate (31). The sliding plate (43) is disposed on the linear driving member (41) and is connected to the movable tray (34). The at least one connecting member (42) slidably connects the fixed tray (32) and all of the movable trays (34) in sequence. The linear driving member (41) moves the sliding plate (43) to move the movable tray (34) thus adjusting spacing between products.
Answer: D