A high-power and heavy-load back-to-back planetary gear test platform, which comprises a driving device (1), a first shaft coupling (2), a speed increaser (3), a second shaft coupling (4) and a speed and torque meter (5) connected in sequence from left to right, characterized in that:
- said test platform further comprises a back-to-back planetary gearbox closed power system (18) and a marine test component (140),
- said back-to-back planetary gearbox closed power system (18) comprises a third shaft coupling (6), a test planetary gearbox (7), a first linkage mechanism (8), a torsion shaft assembly (9), a test companion gearbox (10), a fourth shaft coupling (11), second linkage mechanism (12) and a loading device (13), wherein the speed and torque meter (5) is connected to one end of the test planetary gearbox (7) through the third shaft coupling (6), another end of the test planetary gearbox (7) and one end of the test companion gearbox (10) are connected through the torsion shaft assembly (9), torsion shaft assembly (8) is installed on the torsion shaft assembly (9) located between another end of the test planetary gearbox (7) and one end of the test companion gearbox (10), another end of the test companion gearbox (10) and the loading device (13) are connected through the fourth shaft coupling (11), and the second linkage mechanism (12) is installed on the fourth shaft coupling (11),
- the torsion shaft assembly (9) comprises a clamping groove body (9-2), a clamping assembly (9-3) and a plurality of shaft segments (9-1), a first shaft segment (9-1) of two adjacent shaft segments (9-1) has an axial positioning protrusion (9-4) processed on a side end surface at a position opposite to a second shaft segment (9-1) of the two adjacent shaft segments (9-1), while the second shaft segment (9-1) has an axial positioning groove (9-5) processed at a side end surface on one side at a position corresponding to the axial positioning protrusion (9-4), the clamping groove body (9-2) is coaxially installed on the axial positioning protrusion (9-4), the clamping component (9-3) is embedded inside the axial positioning groove (9-5), the second shaft segment (9-1) is coaxially installed on the clamping groove body (9-2) so that the clamping groove body (9-2) and the axial positioning protrusion (9-4) are tightly clamped through an axial displacement provided by the clamping component (9-3), and the clamping groove body (9-2) generates a radial displacement under an axial pushing of the clamping component (9-3) and is expanded in the radial direction to tightly connect with the axial positioning groove (9-5) of the second shaft segment (9-1);
- the clamping groove body (9-2) is a cylindrical groove body with an inverted tapered groove, and the cylindrical groove body has a plurality of elongated holes (9-6) along its axial direction thereon;
- the clamping component (9-3) comprises an upper clamping unit (9-7), a lower clamping unit (9-8) and a clamping moving block (9-9), wherein the upper clamping unit (9-7) and the lower clamping unit (9-8) are arranged at a left side and a right side along the axial direction inside the axial positioning groove (9-5) while the lower clamping unit (9-8) is biased against a bottom end surface (951) of the axial positioning groove (9-5), the upper clamping unit (9-7) and the lower clamping unit (9-8) have a corresponding side facing each other and are processed with inclined surfaces such that the inclined surfaces of the upper clamping unit (9-7) and the inclined surface of the lower clamping unit (9-8) form an inverted tapered space, the clamping moving block (9-9) is slidably installed inside the inverted tapered space and an outer side wall of the clamping moving block (9-9) is in contact with the inclined surface of the upper clamping unit (9-7) and the inclined surface of the lower clamping unit (9-8) respectively;
- the marine test component (140) is installed on an outer casing (71) of the test planetary gearbox (7) and provides corrosive medium and lubricating oil for the test planetary gearbox (7) to realize simulated marine environment testing.