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An assembly device includes a framework resting on a planar support, a support element mounted movably in rotation relative to the framework, an immobilizing device, and a positioning assembly mounted in rotation on the support element. A front frame of the fixed structure is positioned on the posit

An assembly device includes a framework resting on a planar support, a support element mounted movably in rotation relative to the framework, an immobilizing device, and a positioning assembly mounted in rotation on the support element. A front frame of the fixed structure is positioned on the positioning assembly, and the immobilizing device is arranged to immobilize the front frame on the positioning assembly. In particular, the assembly device allows, in the immobilizing position on the positioning assembly, for the front frame to extend transversely to the planar support.

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1. An assembling device for a fixed thrust reverser structure of an aircraft propulsion assembly, the fixed thrust reverser structure comprising a front frame mounted on a fan casing of a turbojet engine of the propulsion assembly, the assembly device comprising: a framework resting on a planar supp

1. An assembling device for a fixed thrust reverser structure of an aircraft propulsion assembly, the fixed thrust reverser structure comprising a front frame mounted on a fan casing of a turbojet engine of the propulsion assembly, the assembly device comprising: a framework resting on a planar support;a support element mounted in rotation with respect to the framework about an axis of rotation;a positioning assembly mounted in rotation on the support element and on which the front frame is positioned; andimmobilization means arranged to immobilize the front frame on the positioning assembly, wherein the assembling device is configured in such a way that, in a immobilization position on the positioning assembly, the front frame extends transversely to the planar support, and the positioning assembly and the immobilization means are arranged in such a way that, in the immobilization position on the positioning assembly, the front frame extends transversely to an axis of rotation of the support element. 2. The assembling device according to claim 1, wherein the positioning assembly is removably mounted on the support element. 3. The assembling device according to claim 1, wherein the axis of rotation of the support element is substantially horizontal under conditions of use of the assembling device. 4. The assembling device according to claim 1, wherein the positioning assembly comprises at least one positioning element presenting a peripheral mounting wall on which the front frame is mounted. 5. The assembling device according to claim 4, wherein the peripheral mounting wall comprises a plurality of mounting orifices arranged to cooperate with the immobilization means. 6. The assembling device according to claim 5, wherein the immobilization means comprises at least one immobilization member movably mounted between the immobilization position of the front frame in which the at least one immobilization member is arranged to extend through an opening arranged in the front frame and one of the mounting orifices, and a release position of the front frame. 7. The assembling device according to claim 6, wherein the at least one immobilization member is an immobilization pin. 8. The assembling device according to claim 4, wherein the immobilization means comprises at least one clamping member movably mounted between a clamping position of the front frame in which the at least one clamping member is arranged to exert a pressure against the front frame so as to press the front frame against the peripheral mounting wall, and a release position of the front frame. 9. The assembling device according to claim 1, wherein the immobilization means comprises a plurality of immobilization elements angularly shifted from one another with respect to the axis of rotation of the support element. 10. The assembling device according to claim 9, wherein each immobilization element comprises at least one of a clamping member and an immobilization member. 11. The assembling device according to claim 10, wherein each immobilization element comprises an actuating lever connected to at least one of a corresponding clamping member and a corresponding immobilization member, the actuating lever being pivotally mounted between a first position in which at least one of the corresponding clamping member and the corresponding immobilization member are in a release position, and a second position in which at least one of the corresponding clamping member and the corresponding immobilization member are in a clamping and the immobilization position, the actuating lever being arranged in such a way that a displacement of the actuating lever between its first and second positions causes a displacement of at least one of the corresponding clamping member and the corresponding immobilization member between the release position and the clamping and immobilization positions thereof. 12. The assembling device according to claim 1, further comprising holding means mounted on the support element and arranged to hold the front frame on the support element. 13. The assembling device according to claim 12, wherein the holding means are removably mounted on the support element. 14. The assembling device according to claim 12, wherein the holding means comprises a plurality of holding arms angularly shifted from one another with respect to the axis of rotation of the support element. 15. The assembling device according to claim 1, further comprising rotatably driving means arranged to drive in rotation the support element about the axis of rotation thereof. 16. A method for assembling a fixed thrust reverser structure of an aircraft propulsion assembly, comprising the following steps: supplying the assembling device according to claim 1,positioning the front frame on the fixed thrust reverser structure of the positioning assembly;immobilizing the front frame on the positioning assembly by means of the immobilization means; andassembling various equipment on the front frame so as to form the fixed thrust reverser structure, the assembling step comprising at least one step comprising driving in rotation the support element about the axis of rotation thereof. 17. The assembling method according to claim 16, wherein the assembling step comprises the following steps: holding the front frame on the support element using holding means;releasing the front frame from the positioning assembly;dismounting the positioning assembly from the support element; andassembling a connecting part on the front frame, said connecting part being mounted on the fan casing of the turbojet engine of the propulsion assembly.