问签名一直显示过期？

{"Response":{"Error":{"Code":"AuthFailure.SignatureExpire","Message":"The signature is expired, please request again."},"RequestId":"61c63c74-67f4-4305-bd46-52fb512fe543"}}

https://aai.tencentcloudapi.com/?Action=SentenceRecognition&ProjectId=0&SubServiceType=2&EngSerViceType=8k&SourceType=0&Url=1.mp3&SecretId=*******************&Timestamp=1545182284694&VoiceFormat=mp3&UsrAudioKey=www&Region=ap-chengdu&Nonce=86400&Signature=z%2FwLmUKvLHPpC%2FJ2d5uY4ZRFwW4%3D&Version=2018-05-22

获取了好多次签名，都是过期，有大佬指点一波吗？