Hydraulic motor gear rack opening and closing mechanism

The utility model discloses a hydraulic motor gear rack opening and closing mechanism which comprises a hydraulic motor, a gear, a shaft end check ring and a rack, the gear is embedded in the output end of the hydraulic motor, the shaft end check ring is connected to the output end of the hydraulic motor, the rack is arranged at the upper end of the gear, the gear is meshed with the rack, and the rack is connected with the gear. And a pushing part is arranged at the upper end of the hydraulic motor. The push-pull rod is driven by the air cylinder, the motor supporting plate is pushed by the push-pull rod to move downwards along the guide groove of the motor hanging seat, so that the gear is separated from the rack, and the back-up wrench on the back-up wrench can freely move along the linear guide rail, so that the back-up wrench follow-up function can be realized when the main wrench is screwed and unscrewed. 本实用新型公开了一种液压马达齿轮齿条开合机构，包括液压马达、齿轮、轴端挡圈以及齿条，所述齿轮嵌装在所述液压马达输出端，所述轴端挡圈连接在所述液压马达输出端，所述齿条设置在所述齿轮上端，所述齿轮与所述齿