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diff --git a/app/main_window.py b/app/main_window.py
index 067e718..86d7b3f 100644
--- a/app/main_window.py
+++ b/app/main_window.py
@@ -15,6 +15,7 @@ from .data_interface import DataInterface
 from .mini_tool_interface import MiniToolInterface
 from .code_configuration_interface import CodeConfigurationInterface
 from .finance_interface import FinanceInterface
+from .mech_design_interface import MechDesignInterface
 from .about_interface import AboutInterface
 import base64
 
@@ -54,6 +55,7 @@ class MainWindow(FluentWindow):
         self.miniToolInterface = MiniToolInterface(self)
         self.codeConfigurationInterface = CodeConfigurationInterface(self)
         self.financeInterface = FinanceInterface(self)
+        self.mechDesignInterface = MechDesignInterface(self)
 
 
     def initNavigation(self):
@@ -62,7 +64,8 @@ class MainWindow(FluentWindow):
         self.addSubInterface(self.codeConfigurationInterface, FIF.CODE, self.tr('代码生成'))
         self.addSubInterface(self.serialTerminalInterface, FIF.COMMAND_PROMPT,self.tr('串口助手'))
         self.addSubInterface(self.partLibraryInterface, FIF.DOWNLOAD, self.tr('零件库'))
-        self.addSubInterface(self.financeInterface, FIF.DOCUMENT, self.tr('财务做账'))
+        self.addSubInterface(self.mechDesignInterface, FIF.SETTING, self.tr('机械设计'))
+        # self.addSubInterface(self.financeInterface, FIF.DOCUMENT, self.tr('财务做账'))
         self.addSubInterface(self.miniToolInterface, FIF.LIBRARY, self.tr('迷你工具箱'))
         self.addSubInterface(AboutInterface(self), FIF.INFO, self.tr('关于'), position=NavigationItemPosition.BOTTOM)
 
diff --git a/app/mech_design_interface.py b/app/mech_design_interface.py
new file mode 100644
index 0000000..265fd8f
--- /dev/null
+++ b/app/mech_design_interface.py
@@ -0,0 +1,564 @@
+from PyQt5.QtWidgets import QWidget, QVBoxLayout, QHBoxLayout, QGridLayout, QStackedWidget, QSizePolicy
+from PyQt5.QtCore import Qt
+from qfluentwidgets import (TitleLabel, SubtitleLabel, BodyLabel, LineEdit, PushButton, 
+                           ComboBox, CardWidget, FluentIcon, InfoBar, DoubleSpinBox, 
+                           PushSettingCard, TabBar)
+import math
+
+
+class GearCalculator(QWidget):
+    """齿轮参数计算器"""
+    def __init__(self, parent=None):
+        super().__init__(parent)
+        self.setObjectName("GearCalculator")
+        self._init_ui()
+    
+    def _init_ui(self):
+        layout = QVBoxLayout(self)
+        layout.setContentsMargins(30, 30, 30, 30)
+        layout.setSpacing(15)
+        layout.setAlignment(Qt.AlignTop)
+        
+        # 标题
+        title = SubtitleLabel("齿轮参数计算")
+        layout.addWidget(title)
+        
+        # 说明
+        desc = BodyLabel("输入任意已知参数，点击计算按钮自动计算其他参数")
+        desc.setWordWrap(True)
+        layout.addWidget(desc)
+        
+        # 参数输入区域
+        grid_layout = QGridLayout()
+        grid_layout.setSpacing(10)
+        
+        # 齿轮1参数
+        grid_layout.addWidget(BodyLabel("齿轮1 模数 (m):"), 0, 0)
+        self.module1_spin = DoubleSpinBox()
+        self.module1_spin.setRange(0, 100)
+        self.module1_spin.setSingleStep(0.5)
+        self.module1_spin.setDecimals(2)
+        self.module1_spin.setSuffix(" mm")
+        grid_layout.addWidget(self.module1_spin, 0, 1)
+        
+        grid_layout.addWidget(BodyLabel("齿轮1 齿数 (Z1):"), 1, 0)
+        self.teeth1_spin = DoubleSpinBox()
+        self.teeth1_spin.setRange(0, 500)
+        self.teeth1_spin.setSingleStep(1)
+        self.teeth1_spin.setDecimals(0)
+        grid_layout.addWidget(self.teeth1_spin, 1, 1)
+        
+        grid_layout.addWidget(BodyLabel("齿轮1 分度圆直径 (d1):"), 2, 0)
+        self.diameter1_spin = DoubleSpinBox()
+        self.diameter1_spin.setRange(0, 1000)
+        self.diameter1_spin.setSingleStep(1)
+        self.diameter1_spin.setDecimals(2)
+        self.diameter1_spin.setSuffix(" mm")
+        grid_layout.addWidget(self.diameter1_spin, 2, 1)
+        
+        # 齿轮2参数
+        grid_layout.addWidget(BodyLabel("齿轮2 齿数 (Z2):"), 0, 2)
+        self.teeth2_spin = DoubleSpinBox()
+        self.teeth2_spin.setRange(0, 500)
+        self.teeth2_spin.setSingleStep(1)
+        self.teeth2_spin.setDecimals(0)
+        grid_layout.addWidget(self.teeth2_spin, 0, 3)
+        
+        grid_layout.addWidget(BodyLabel("齿轮2 分度圆直径 (d2):"), 1, 2)
+        self.diameter2_spin = DoubleSpinBox()
+        self.diameter2_spin.setRange(0, 1000)
+        self.diameter2_spin.setSingleStep(1)
+        self.diameter2_spin.setDecimals(2)
+        self.diameter2_spin.setSuffix(" mm")
+        grid_layout.addWidget(self.diameter2_spin, 1, 3)
+        
+        # 中心距
+        grid_layout.addWidget(BodyLabel("中心距 (a):"), 2, 2)
+        self.center_distance_spin = DoubleSpinBox()
+        self.center_distance_spin.setRange(0, 2000)
+        self.center_distance_spin.setSingleStep(1)
+        self.center_distance_spin.setDecimals(2)
+        self.center_distance_spin.setSuffix(" mm")
+        grid_layout.addWidget(self.center_distance_spin, 2, 3)
+        
+        # 传动比
+        grid_layout.addWidget(BodyLabel("传动比 (i):"), 3, 0)
+        self.ratio_spin = DoubleSpinBox()
+        self.ratio_spin.setRange(0, 100)
+        self.ratio_spin.setSingleStep(0.1)
+        self.ratio_spin.setDecimals(3)
+        grid_layout.addWidget(self.ratio_spin, 3, 1)
+        
+        layout.addLayout(grid_layout)
+        
+        # 按钮区域
+        btn_layout = QHBoxLayout()
+        self.calc_btn = PushButton(FluentIcon.PLAY, "计算")
+        self.calc_btn.clicked.connect(self._calculate)
+        self.clear_btn = PushButton(FluentIcon.DELETE, "清空")
+        self.clear_btn.clicked.connect(self._clear)
+        btn_layout.addWidget(self.calc_btn)
+        btn_layout.addWidget(self.clear_btn)
+        btn_layout.addStretch()
+        layout.addLayout(btn_layout)
+        
+        # 结果显示
+        self.result_label = BodyLabel("")
+        self.result_label.setWordWrap(True)
+        layout.addWidget(self.result_label)
+    
+    def _calculate(self):
+        """计算齿轮参数"""
+        try:
+            # 获取输入值
+            m = self.module1_spin.value() if self.module1_spin.value() > 0 else None
+            z1 = self.teeth1_spin.value() if self.teeth1_spin.value() > 0 else None
+            d1 = self.diameter1_spin.value() if self.diameter1_spin.value() > 0 else None
+            z2 = self.teeth2_spin.value() if self.teeth2_spin.value() > 0 else None
+            d2 = self.diameter2_spin.value() if self.diameter2_spin.value() > 0 else None
+            a = self.center_distance_spin.value() if self.center_distance_spin.value() > 0 else None
+            i = self.ratio_spin.value() if self.ratio_spin.value() > 0 else None
+            
+            # 齿轮基本公式：d = m * z, a = (d1 + d2) / 2, i = z2 / z1
+            
+            # 尝试计算模数
+            if m is None:
+                if d1 and z1:
+                    m = d1 / z1
+                    self.module1_spin.setValue(m)
+                elif d2 and z2:
+                    m = d2 / z2
+                    self.module1_spin.setValue(m)
+            
+            # 尝试计算齿轮1参数
+            if z1 is None and d1 and m:
+                z1 = round(d1 / m)
+                self.teeth1_spin.setValue(z1)
+            elif d1 is None and z1 and m:
+                d1 = m * z1
+                self.diameter1_spin.setValue(d1)
+            
+            # 尝试计算齿轮2参数
+            if z2 is None and d2 and m:
+                z2 = round(d2 / m)
+                self.teeth2_spin.setValue(z2)
+            elif d2 is None and z2 and m:
+                d2 = m * z2
+                self.diameter2_spin.setValue(d2)
+            
+            # 尝试计算传动比
+            if i is None and z1 and z2:
+                i = z2 / z1
+                self.ratio_spin.setValue(i)
+            
+            # 尝试根据传动比计算齿数
+            if i and z1 and z2 is None:
+                z2 = round(z1 * i)
+                self.teeth2_spin.setValue(z2)
+                if m:
+                    d2 = m * z2
+                    self.diameter2_spin.setValue(d2)
+            
+            # 尝试计算中心距
+            if a is None and d1 and d2:
+                a = (d1 + d2) / 2
+                self.center_distance_spin.setValue(a)
+            
+            # 尝试根据中心距计算参数
+            if a and d1 and d2 is None:
+                d2 = 2 * a - d1
+                self.diameter2_spin.setValue(d2)
+                if m:
+                    z2 = round(d2 / m)
+                    self.teeth2_spin.setValue(z2)
+            
+            self.result_label.setText("✓ 计算完成！请检查结果是否符合预期。")
+            
+        except Exception as e:
+            InfoBar.error(
+                title="计算错误",
+                content=f"计算失败: {str(e)}",
+                parent=self,
+                duration=3000
+            )
+    
+    def _clear(self):
+        """清空所有输入"""
+        self.module1_spin.setValue(0)
+        self.teeth1_spin.setValue(0)
+        self.diameter1_spin.setValue(0)
+        self.teeth2_spin.setValue(0)
+        self.diameter2_spin.setValue(0)
+        self.center_distance_spin.setValue(0)
+        self.ratio_spin.setValue(0)
+        self.result_label.setText("")
+
+
+class TimingBeltCalculator(QWidget):
+    """同步带轮参数计算器"""
+    def __init__(self, parent=None):
+        super().__init__(parent)
+        self.setObjectName("TimingBeltCalculator")
+        
+        # 常见同步带型号的节距（pitch）数据 (mm)
+        self.belt_pitches = {
+            "MXL": 2.032,
+            "XL": 5.08,
+            "L": 9.525,
+            "H": 12.7,
+            "XH": 22.225,
+            "XXH": 31.75,
+            "T2.5": 2.5,
+            "T5": 5.0,
+            "T10": 10.0,
+            "T20": 20.0,
+            "AT5": 5.0,
+            "AT10": 10.0,
+            "AT20": 20.0,
+            "HTD 3M": 3.0,
+            "HTD 5M": 5.0,
+            "HTD 8M": 8.0,
+            "HTD 14M": 14.0,
+            "HTD 20M": 20.0,
+            "GT2 2M": 2.0,
+            "GT2 3M": 3.0,
+            "GT2 5M": 5.0,
+        }
+        
+        self._init_ui()
+    
+    def _init_ui(self):
+        layout = QVBoxLayout(self)
+        layout.setContentsMargins(30, 30, 30, 30)
+        layout.setSpacing(15)
+        layout.setAlignment(Qt.AlignTop)
+        
+        # 标题
+        title = SubtitleLabel("同步带轮参数计算")
+        layout.addWidget(title)
+        
+        # 说明
+        desc = BodyLabel("选择同步带型号，输入已知参数进行计算")
+        desc.setWordWrap(True)
+        layout.addWidget(desc)
+        
+        # 参数输入区域
+        grid_layout = QGridLayout()
+        grid_layout.setSpacing(10)
+        
+        # 同步带型号
+        grid_layout.addWidget(BodyLabel("同步带型号:"), 0, 0)
+        self.belt_type_combo = ComboBox()
+        self.belt_type_combo.addItems(list(self.belt_pitches.keys()))
+        self.belt_type_combo.setCurrentText("GT2 2M")
+        grid_layout.addWidget(self.belt_type_combo, 0, 1)
+        
+        grid_layout.addWidget(BodyLabel("节距 (pitch):"), 0, 2)
+        self.pitch_spin = DoubleSpinBox()
+        self.pitch_spin.setRange(0, 100)
+        self.pitch_spin.setSingleStep(0.1)
+        self.pitch_spin.setDecimals(3)
+        self.pitch_spin.setSuffix(" mm")
+        self.pitch_spin.setValue(2.0)
+        self.pitch_spin.setEnabled(False)
+        grid_layout.addWidget(self.pitch_spin, 0, 3)
+        
+        # 带轮1参数
+        grid_layout.addWidget(BodyLabel("带轮1 齿数 (Z1):"), 1, 0)
+        self.pulley1_teeth_spin = DoubleSpinBox()
+        self.pulley1_teeth_spin.setRange(0, 500)
+        self.pulley1_teeth_spin.setSingleStep(1)
+        self.pulley1_teeth_spin.setDecimals(0)
+        grid_layout.addWidget(self.pulley1_teeth_spin, 1, 1)
+        
+        grid_layout.addWidget(BodyLabel("带轮1 节圆直径 (PD1):"), 2, 0)
+        self.pulley1_pd_spin = DoubleSpinBox()
+        self.pulley1_pd_spin.setRange(0, 1000)
+        self.pulley1_pd_spin.setSingleStep(1)
+        self.pulley1_pd_spin.setDecimals(2)
+        self.pulley1_pd_spin.setSuffix(" mm")
+        grid_layout.addWidget(self.pulley1_pd_spin, 2, 1)
+        
+        # 带轮2参数
+        grid_layout.addWidget(BodyLabel("带轮2 齿数 (Z2):"), 1, 2)
+        self.pulley2_teeth_spin = DoubleSpinBox()
+        self.pulley2_teeth_spin.setRange(0, 500)
+        self.pulley2_teeth_spin.setSingleStep(1)
+        self.pulley2_teeth_spin.setDecimals(0)
+        grid_layout.addWidget(self.pulley2_teeth_spin, 1, 3)
+        
+        grid_layout.addWidget(BodyLabel("带轮2 节圆直径 (PD2):"), 2, 2)
+        self.pulley2_pd_spin = DoubleSpinBox()
+        self.pulley2_pd_spin.setRange(0, 1000)
+        self.pulley2_pd_spin.setSingleStep(1)
+        self.pulley2_pd_spin.setDecimals(2)
+        self.pulley2_pd_spin.setSuffix(" mm")
+        grid_layout.addWidget(self.pulley2_pd_spin, 2, 3)
+        
+        # 中心距和带长
+        grid_layout.addWidget(BodyLabel("中心距 (C):"), 3, 0)
+        self.center_distance_spin = DoubleSpinBox()
+        self.center_distance_spin.setRange(0, 5000)
+        self.center_distance_spin.setSingleStep(1)
+        self.center_distance_spin.setDecimals(2)
+        self.center_distance_spin.setSuffix(" mm")
+        grid_layout.addWidget(self.center_distance_spin, 3, 1)
+        
+        grid_layout.addWidget(BodyLabel("带长 (L):"), 3, 2)
+        self.belt_length_spin = DoubleSpinBox()
+        self.belt_length_spin.setRange(0, 10000)
+        self.belt_length_spin.setSingleStep(1)
+        self.belt_length_spin.setDecimals(2)
+        self.belt_length_spin.setSuffix(" mm")
+        grid_layout.addWidget(self.belt_length_spin, 3, 3)
+        
+        # 带齿数和传动比
+        grid_layout.addWidget(BodyLabel("带齿数 (Tb):"), 4, 0)
+        self.belt_teeth_spin = DoubleSpinBox()
+        self.belt_teeth_spin.setRange(0, 5000)
+        self.belt_teeth_spin.setSingleStep(1)
+        self.belt_teeth_spin.setDecimals(0)
+        grid_layout.addWidget(self.belt_teeth_spin, 4, 1)
+        
+        grid_layout.addWidget(BodyLabel("传动比 (i):"), 4, 2)
+        self.ratio_spin = DoubleSpinBox()
+        self.ratio_spin.setRange(0, 100)
+        self.ratio_spin.setSingleStep(0.1)
+        self.ratio_spin.setDecimals(3)
+        grid_layout.addWidget(self.ratio_spin, 4, 3)
+        
+        layout.addLayout(grid_layout)
+        
+        # 按钮区域
+        btn_layout = QHBoxLayout()
+        self.calc_btn = PushButton(FluentIcon.PLAY, "计算")
+        self.calc_btn.clicked.connect(self._calculate)
+        self.clear_btn = PushButton(FluentIcon.DELETE, "清空")
+        self.clear_btn.clicked.connect(self._clear)
+        btn_layout.addWidget(self.calc_btn)
+        btn_layout.addWidget(self.clear_btn)
+        btn_layout.addStretch()
+        layout.addLayout(btn_layout)
+        
+        # 结果显示
+        self.result_label = BodyLabel("")
+        self.result_label.setWordWrap(True)
+        layout.addWidget(self.result_label)
+        
+        # 连接信号
+        self.belt_type_combo.currentTextChanged.connect(self._on_belt_type_changed)
+    
+    def _on_belt_type_changed(self, text):
+        """同步带型号改变时更新节距"""
+        pitch = self.belt_pitches.get(text, 2.0)
+        self.pitch_spin.setValue(pitch)
+    
+    def _calculate(self):
+        """计算同步带参数"""
+        try:
+            # 获取输入值
+            pitch = self.pitch_spin.value()
+            z1 = self.pulley1_teeth_spin.value() if self.pulley1_teeth_spin.value() > 0 else None
+            pd1 = self.pulley1_pd_spin.value() if self.pulley1_pd_spin.value() > 0 else None
+            z2 = self.pulley2_teeth_spin.value() if self.pulley2_teeth_spin.value() > 0 else None
+            pd2 = self.pulley2_pd_spin.value() if self.pulley2_pd_spin.value() > 0 else None
+            c = self.center_distance_spin.value() if self.center_distance_spin.value() > 0 else None
+            l = self.belt_length_spin.value() if self.belt_length_spin.value() > 0 else None
+            tb = self.belt_teeth_spin.value() if self.belt_teeth_spin.value() > 0 else None
+            i = self.ratio_spin.value() if self.ratio_spin.value() > 0 else None
+            
+            # 同步带公式：
+            # PD = (Z * pitch) / π
+            # L = 2C + π(PD1 + PD2)/2 + (PD2 - PD1)²/(4C)
+            # Tb = L / pitch
+            
+            # 计算节圆直径
+            if pd1 is None and z1:
+                pd1 = (z1 * pitch) / math.pi
+                self.pulley1_pd_spin.setValue(pd1)
+            elif z1 is None and pd1:
+                z1 = round((pd1 * math.pi) / pitch)
+                self.pulley1_teeth_spin.setValue(z1)
+            
+            if pd2 is None and z2:
+                pd2 = (z2 * pitch) / math.pi
+                self.pulley2_pd_spin.setValue(pd2)
+            elif z2 is None and pd2:
+                z2 = round((pd2 * math.pi) / pitch)
+                self.pulley2_teeth_spin.setValue(z2)
+            
+            # 计算传动比
+            if i is None and z1 and z2:
+                i = z2 / z1
+                self.ratio_spin.setValue(i)
+            elif i and z1 and z2 is None:
+                z2 = round(z1 * i)
+                self.pulley2_teeth_spin.setValue(z2)
+                pd2 = (z2 * pitch) / math.pi
+                self.pulley2_pd_spin.setValue(pd2)
+            
+            # 计算带长
+            if l is None and c and pd1 and pd2:
+                l = 2 * c + math.pi * (pd1 + pd2) / 2 + (pd2 - pd1) ** 2 / (4 * c)
+                self.belt_length_spin.setValue(l)
+            
+            # 计算带齿数
+            if tb is None and l:
+                tb = round(l / pitch)
+                self.belt_teeth_spin.setValue(tb)
+            elif l is None and tb:
+                l = tb * pitch
+                self.belt_length_spin.setValue(l)
+            
+            # 根据带长和节圆直径计算中心距（近似）
+            if c is None and l and pd1 and pd2:
+                # 使用近似公式求解
+                b = math.pi * (pd1 + pd2) / 2
+                a_term = (pd2 - pd1) ** 2 / 4
+                # 2C + b + a_term/C = L
+                # 求解二次方程: 2C² + bC + a_term - LC = 0
+                # 2C² + (b-L)C + a_term = 0
+                A = 2
+                B = b - l
+                C_term = a_term
+                discriminant = B**2 - 4*A*C_term
+                if discriminant >= 0:
+                    c = (-B + math.sqrt(discriminant)) / (2*A)
+                    self.center_distance_spin.setValue(c)
+            
+            self.result_label.setText("✓ 计算完成！请检查结果是否符合预期。\n提示：带长计算为理论值，实际选型请参考标准带长。")
+            
+        except Exception as e:
+            InfoBar.error(
+                title="计算错误",
+                content=f"计算失败: {str(e)}",
+                parent=self,
+                duration=3000
+            )
+    
+    def _clear(self):
+        """清空所有输入"""
+        self.pulley1_teeth_spin.setValue(0)
+        self.pulley1_pd_spin.setValue(0)
+        self.pulley2_teeth_spin.setValue(0)
+        self.pulley2_pd_spin.setValue(0)
+        self.center_distance_spin.setValue(0)
+        self.belt_length_spin.setValue(0)
+        self.belt_teeth_spin.setValue(0)
+        self.ratio_spin.setValue(0)
+        self.result_label.setText("")
+
+
+class MechDesignInterface(QWidget):
+    """机械设计计算界面"""
+    def __init__(self, parent=None):
+        super().__init__(parent)
+        self.setObjectName("MechDesignInterface")
+        self._init_ui()
+    
+    def _init_ui(self):
+        layout = QVBoxLayout(self)
+        layout.setAlignment(Qt.AlignTop)
+        layout.setContentsMargins(10, 0, 10, 10)
+        
+        # 顶部标签栏
+        self.tabBar = TabBar(self)
+        self.tabBar.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Fixed)
+        layout.addWidget(self.tabBar)
+        
+        self.stackedWidget = QStackedWidget(self)
+        layout.addWidget(self.stackedWidget)
+        
+        # 主页面
+        self.mainPage = QWidget(self)
+        mainLayout = QVBoxLayout(self.mainPage)
+        mainLayout.setAlignment(Qt.AlignTop)
+        mainLayout.setContentsMargins(20, 20, 20, 20)
+        mainLayout.setSpacing(15)
+        
+        # 页面标题
+        title = SubtitleLabel("机械设计计算工具")
+        mainLayout.addWidget(title)
+        
+        # 页面说明
+        desc = BodyLabel("选择需要的计算工具")
+        desc.setWordWrap(True)
+        mainLayout.addWidget(desc)
+        
+        # 齿轮计算器卡片
+        self.gearCard = PushSettingCard(
+            text="▶ 启动",
+            icon=FluentIcon.UNIT,
+            title="齿轮参数计算",
+            content="计算齿轮模数、齿数、分度圆直径、中心距、传动比等参数"
+        )
+        self.gearCard.clicked.connect(self.open_gear_tab)
+        mainLayout.addWidget(self.gearCard)
+        
+        # 同步带计算器卡片
+        self.beltCard = PushSettingCard(
+            text="▶ 启动",
+            icon=FluentIcon.SYNC,
+            title="同步带轮参数计算",
+            content="计算同步带轮齿数、节圆直径、中心距、带长等参数"
+        )
+        self.beltCard.clicked.connect(self.open_belt_tab)
+        mainLayout.addWidget(self.beltCard)
+        
+        mainLayout.addStretch()
+        
+        # 添加主页面到堆叠窗口
+        self.addSubInterface(self.mainPage, "mainPage", "机械设计")
+        
+        # 信号连接
+        self.stackedWidget.currentChanged.connect(self.onCurrentIndexChanged)
+        self.tabBar.tabCloseRequested.connect(self.onCloseTab)
+    
+    def addSubInterface(self, widget: QWidget, objectName: str, text: str):
+        widget.setObjectName(objectName)
+        self.stackedWidget.addWidget(widget)
+        self.tabBar.addTab(
+            routeKey=objectName,
+            text=text,
+            onClick=lambda: self.stackedWidget.setCurrentWidget(widget)
+        )
+    
+    def onCurrentIndexChanged(self, index):
+        widget = self.stackedWidget.widget(index)
+        self.tabBar.setCurrentTab(widget.objectName())
+    
+    def onCloseTab(self, index: int):
+        item = self.tabBar.tabItem(index)
+        widget = self.findChild(QWidget, item.routeKey())
+        # 禁止关闭主页
+        if widget.objectName() == "mainPage":
+            return
+        self.stackedWidget.removeWidget(widget)
+        self.tabBar.removeTab(index)
+        widget.deleteLater()
+    
+    def open_gear_tab(self):
+        # 检查是否已存在标签页，避免重复添加
+        for i in range(self.stackedWidget.count()):
+            widget = self.stackedWidget.widget(i)
+            if widget.objectName() == "gearPage":
+                self.stackedWidget.setCurrentWidget(widget)
+                self.tabBar.setCurrentTab("gearPage")
+                return
+        gear_page = GearCalculator(self)
+        self.addSubInterface(gear_page, "gearPage", "齿轮计算")
+        self.stackedWidget.setCurrentWidget(gear_page)
+        self.tabBar.setCurrentTab("gearPage")
+    
+    def open_belt_tab(self):
+        # 检查是否已存在标签页，避免重复添加
+        for i in range(self.stackedWidget.count()):
+            widget = self.stackedWidget.widget(i)
+            if widget.objectName() == "beltPage":
+                self.stackedWidget.setCurrentWidget(widget)
+                self.tabBar.setCurrentTab("beltPage")
+                return
+        belt_page = TimingBeltCalculator(self)
+        self.addSubInterface(belt_page, "beltPage", "同步带计算")
+        self.stackedWidget.setCurrentWidget(belt_page)
+        self.tabBar.setCurrentTab("beltPage")
diff --git a/assets/User_code/bsp/.DS_Store b/assets/User_code/bsp/.DS_Store
index ec9a612..1c29a4b 100644
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diff --git a/手册.pages b/手册.pages
deleted file mode 100644
index 48ec89a..0000000
Binary files a/手册.pages and /dev/null differ