Please select the most similar patent number from A, B, C and D. Which number is?
A workbench for fitness equipment accessory machining, the workbench comprising a base (1) and a housing (2). The bottom of the base (1) is fixed to the housing (2). A workbench body (16) is arranged in the housing (2). The bottom surface of the workbench body (16) is fixedly mounted on a lifting seat (6). A height adjusting assembly for adjusting the height of the lifting seat (6) is arranged on the lifting seat (6). Two filtering cavities (8) are symmetrically provided in the housing (2). Filtering assemblies (22) for filtering air are symmetrically arranged in each of the filtering cavities (8). Two sides of the workbench body (16) are connected to inner walls of the housing (2) in a sliding manner. Dust is filtered by means of the filtering assemblies (22), such that cleanliness in the housing (2) is guaranteed, and the problem that an existing device cannot collect and treat dust generated during an accessory machining process such that dust accumulates on a machining table is solved; and by means of the arrangement of the height adjusting assembly, the height of the workbench body (16) is adjusted, thereby facilitating machining of accessories of different types, and improving the machining efficiency.
A: A workbench for assembling a small mechanical apparatus. The workbench comprises an assembling table (1), a lifting mechanism and a support base (2). The assembling table (1) is mounted at the top end of the support base (2); a tray (11) is fixedly connected to the middle of the bottom end of the assembling table (1); and the lifting mechanism is mounted between the assembling table (1) and the support base (2) and used for adjusting the distance between the assembling table (1) and the support base (2). The lifting mechanism comprises a servo motor (53), a weighing support (3) and a lifting column (5), wherein the weighing support (3) is fixedly connected to the top end of the support base (2); the servo motor (53) is mounted in the weighing support (3); the top end of the servo motor (53) is rotationally connected to a threaded column (52); the bottom end of the tray (11) is fixedly connected to the lifting column (5); a bottom surface of the lifting column (5) is provided with a mounting cavity (55) extending upwards; the top end of the threaded column (52) extends into the mounting cavity (55); the threaded column (52) is screwed to the mounting cavity (55) by means of a thread; and a limiting sleeve (51) is sleeved on the outer side of the lifting column (5). By means of a servo motor being additionally arranged in a weighing support and by means of providing a simple thread lifting mechanism, the height of an assembling table can be adjusted; and the workbench is simple and convenient to maintain, and the reducing of the maintenance cost of the workbench is facilitated.
B: A machining quality testing apparatus for mechanical parts, pertaining to the technical field of machining, and solving the problem in which existing devices lack protection for a testing apparatus and cause the testing apparatus to be exposed. The machining quality testing apparatus for mechanical parts comprises a support frame (1) and a base (2). A lower portion of the support frame (1) is fixed to the base (2), and an accommodation cavity (3) is provided within the base (2). An accommodation assembly is provided within the accommodation cavity (3). A barrier plate (4) is provided above the base (2). The base (2) and the barrier plate (4) are fixedly connected by a bolt. The accommodation assembly comprises a drive assembly, a testing apparatus installation base (14), and a vertically movable assembly (15). The drive assembly and the vertically movable assembly (15) are fixedly connected. The invention achieves protection of the testing apparatus and enables convenient accommodation and retrieval thereof, thereby preventing damage to the testing apparatus, and accordingly improving testing accuracy. In addition, the invention achieves retaining and position limiting of mechanical parts, thereby preventing mechanical parts from loosening or falling off during a testing process, and improving testing efficiency.
C: A positioning fixture for machining of a housing of a sewing machine head, comprising a base (1) and an upright column (11); the upright column (11) is arranged above the base (1), a mounting base (13) is fixedly mounted in the middle of the upright column (11), clamping assemblies (14) for clamping a housing are symmetrically arranged on two sides of the mounting base (13), the mounting base (13) is fixedly connected to the clamping assemblies (14), and a position adjustment assembly for adjusting the height of the upright column (11) is arranged between the upright column (11) and the base (1). The positioning fixture achieves the adjustment of the height of the clamping assemblies by means of the provision of the position adjustment assembly, facilitating clamping of housings in different environments, increasing the machining efficiency of housings, and achieving the clamping and limiting of housings of different shapes by means of the provision of a swing assembly.
D: An automatic material carrying claw mechanism, relating to the technical field of material carrying mechanisms, solving the problem of being inconvenient to adjust the height of the existing mechanical claw device, and comprising a support frame (1) and a base (22). The support frame (1) is fixedly mounted on the upper part of the base (22). A horizontal transverse plate (2) is fixedly mounted at the top of the support frame (1). The support frame (1) is provided with a lifting/lowering base (7). A clipping mechanism (15) for carrying a material is mounted on the lifting/lowering base (7). A height adjustment component used for adjusting the height of the clipping mechanism is also mounted on the horizontal transverse plate (2). The mechanism is provided with the height adjustment component for adjusting the height of the clipping mechanism, which reduces the carrying difficulty of an electronic component and improves the carrying efficiency; at the same time, a limiting component is arranged for limiting the lifting/lowering base, which ensures the accuracy of electronic component carrying and prevents the electronic component from falling off.
Answer: A