diff --git a/agv_app/app.py b/agv_app/app.py
index d567c60..c834760 100644
--- a/agv_app/app.py
+++ b/agv_app/app.py
@@ -1379,56 +1379,44 @@ def api_qr_config_scan(qr_id):
     try:
         import cv2
         import numpy as np
-        # 从机械臂摄像头拉取一帧 JPEG
-        r = requests.get(ARM_CAMERA_CONFIG["url"], stream=True, timeout=5)
-        if r.status_code != 200:
+        # 从机械臂摄像头 snapshot 端点拉取一帧 JPEG
+        r = requests.get(ARM_CAMERA_CONFIG.get("snapshot_url", ARM_CAMERA_CONFIG["url"]), timeout=8)
+        if r.status_code != 200 or not r.content:
             return jsonify({"ok": False, "error": "无法连接机械臂摄像头"}), 400
-        data = b""
-        for chunk in r.iter_content(chunk_size=4096):
-            data += chunk
-            s = data.find(b"\xff\xd8")
-            e = data.find(b"\xff\xd9", s + 2) if s >= 0 else -1
-            if s >= 0 and e > s:
-                r.close()
-                jpg_bytes = data[s:e+2]
-                # 解码为 numpy 数组并检测二维码
-                nparr = np.frombuffer(jpg_bytes, np.uint8)
-                frame = cv2.imdecode(nparr, cv2.IMREAD_COLOR)
-                if frame is None:
-                    return jsonify({"ok": False, "error": "图像解码失败"}), 400
-                # 使用 OpenCV QRCodeDetector 检测
-                detector = cv2.QRCodeDetector()
-                result, _, _ = detector.detectAndDecode(frame)
-                if result and len(result.strip()) > 0:
-                    result = result.strip()
-                    # 保存到配置项
-                    for entry in gs.qr_config:
-                        if entry["id"] == qr_id:
-                            entry["qr_value"] = result
-                            # 尝试匹配机型
-                            matched_model = None
-                            for model in gs.models_config:
-                                prefix = model.get("serial_prefix", "")
-                                if prefix and result.startswith(prefix):
-                                    matched_model = model
-                                    break
-                            if matched_model:
-                                entry["model_id"] = matched_model["id"]
-                            save_json("qr_config.json", gs.qr_config)
-                            return jsonify({
-                                "ok": True,
-                                "qr_value": result,
-                                "model_id": entry.get("model_id", ""),
-                                "model_name": matched_model["name"] if matched_model else ""
-                            })
-                    return jsonify({"ok": False, "error": f"二维码 {qr_id} 不存在"}), 404
-                else:
-                    return jsonify({"ok": False, "error": "未检测到二维码"})
-            if len(data) > 1024 * 1024:
-                r.close()
-                return jsonify({"ok": False, "error": "摄像头数据流异常"}), 400
-        r.close()
-        return jsonify({"ok": False, "error": "未收到完整图像帧"}), 400
+        jpg_bytes = r.content
+        # 解码为 numpy 数组并检测二维码
+        nparr = np.frombuffer(jpg_bytes, np.uint8)
+        frame = cv2.imdecode(nparr, cv2.IMREAD_COLOR)
+        if frame is None:
+            return jsonify({"ok": False, "error": "图像解码失败"}), 400
+        # 使用 OpenCV QRCodeDetector 检测
+        detector = cv2.QRCodeDetector()
+        result, _, _ = detector.detectAndDecode(frame)
+        if result and len(result.strip()) > 0:
+            result = result.strip()
+            # 保存到配置项
+            for entry in gs.qr_config:
+                if entry["id"] == qr_id:
+                    entry["qr_value"] = result
+                    # 尝试匹配机型
+                    matched_model = None
+                    for model in gs.models_config:
+                        prefix = model.get("serial_prefix", "")
+                        if prefix and result.startswith(prefix):
+                            matched_model = model
+                            break
+                    if matched_model:
+                        entry["model_id"] = matched_model["id"]
+                    save_json("qr_config.json", gs.qr_config)
+                    return jsonify({
+                        "ok": True,
+                        "qr_value": result,
+                        "model_id": entry.get("model_id", ""),
+                        "model_name": matched_model["name"] if matched_model else ""
+                    })
+            return jsonify({"ok": False, "error": f"二维码 {qr_id} 不存在"}), 404
+        else:
+            return jsonify({"ok": False, "error": "未检测到二维码"})
     except Exception as ex:
         logger.error(f"QR 扫描机械臂摄像头失败: {ex}")
         return jsonify({"ok": False, "error": f"扫描失败: {str(ex)}"}), 400