⚙️ 皮带周长示意Belt Length (demo)

使用说明与常见问题How-to & FAQ

「皮带周长示意」是什么？What is the Belt Length (demo) tool?

开口皮带 L ≈ 2C + π(D+d)/2 + (D-d)²/(4C)。本地处理。可设置「中心距 C」、「大轮直径 D」、「小轮直径 d」。Open belt L ≈ 2C + π(D+d)/2 + (D-d)²/(4C). Processed locally. Settings: Center distance C, Large pulley D, Small pulley d.

如何使用「皮带周长示意」？How do I use the Belt Length (demo) tool?

在「皮带周长示意」中，填写「中心距 C」、「大轮直径 D」、「小轮直径 d」等参数，结果会随输入实时计算并显示在下方。In the Belt Length (demo): Fill in "Center distance C", "Large pulley D", "Small pulley d"; results are recalculated instantly as you type.

交叉皮带能算吗？Does it work for a crossed belt?

不能，本页只算开口皮带：L ≈ 2C + π(D + d) ÷ 2 + (D − d)² ÷ (4C)。交叉皮带的最后一项改为 (D + d)² ÷ (4C)。No, it is for an open belt: L ≈ 2C + π(D + d) ÷ 2 + (D − d)² ÷ (4C). For a crossed belt the last term becomes (D + d)² ÷ (4C).

能举个计算实例吗？Can you show a worked example?

例如在「皮带周长示意」中填 中心距 C = 500，大轮直径 D = 200，小轮直径 d = 100，结果区显示：皮带长：1,476.2389For example, entering Center distance C = 500, Large pulley D = 200, Small pulley d = 100 in the Belt Length (demo) gives: Belt length: 1,476.2389

哪些输入会被检查？Which inputs are validated?

「皮带周长示意」会检查这些输入——「中心距 C」、「大轮直径 D」、「小轮直径 d」：必须填写，须大于 0；绝对值超过 10¹⁵ 的数也会被拒绝。不符合时结果区显示具体提示，不会给出数字。The Belt Length (demo) checks its inputs — "Center distance C", "Large pulley D", "Small pulley d": required, must be greater than 0; numbers above 10¹⁵ in absolute value are rejected too. When a value fails, the result area names the problem instead of showing a number.

有哪些选项可以调整？What options can I adjust?

「皮带周长示意」的设置：「中心距 C」默认 500；「大轮直径 D」默认 200；「小轮直径 d」默认 100。每次生成结果都按当前设置处理。Settings in the Belt Length (demo) — "Center distance C" default 500; "Large pulley D" default 200; "Small pulley d" default 100. The result always uses the current settings.

计算结果可以用于作业或工程吗？Can I use the results for homework or engineering?

「皮带周长示意」使用教科书标准公式（公式写在说明和常见问题中），适合学习和估算核对；涉及安全的工程设计请以规范和实测为准。The Belt Length (demo) uses standard textbook formulas (given in the description and FAQ), which is good for learning and checking estimates; for safety-critical engineering follow codes and measured values.

「皮带周长示意」免费吗？需要注册吗？Is the Belt Length (demo) free? Do I need an account?

「皮带周长示意」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Belt Length (demo) is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.