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Digital Kitchen Scale: a Cantilever Load Cell in a Sealed Dual Housing (Edlund, 2009)
A digital scale built to survive a kitchen: spills, washing and being dropped. The load cell is a short cantilever with a strain sensor on top, and the electronics sit in a sealed compartment. Both are in a plastic chassis held loosely inside a second, outer housing of stainless steel and plastic, with crushable spacers between the two.
Result: a digital kitchen scale with a removable pan, sealed display and touchpad, battery power and an overload stop under the load cell.
Source: R. S. Whitney (Edlund Company), US Patent 7,554,043 (2009). Unknown: sizes, capacity, resolution and the electronics; the patent says suitable force transducers are readily available. Ours: the display and button types. Picture: Wikimedia Commons.
高级
2 days
说明
1
1
Mount the cantilever load cell
Mount the cantilever load cell
In the load-cell cavity of the plastic chassis, screw a base plate to the cavity floor. Screw the cantilever support to the base plate; a support plate on the cantilever carries the posts for the pan. A strain transducer on top of the cantilever senses the top stretching as it bends under a load. A window in the base plate leaves the cavity floor just below the free end, so an overload bottoms out there instead of breaking the transducer.
此步骤所需材料：
称重传感器1 cantilever type
塑料1 chassis
机螺钉1 套所需工具：
螺丝刀套装
未知尺寸2
2
Seal in the electronics
Seal in the electronics
On the other side of the chassis, fit the display electronics behind one opening and the touchpad electronics behind another, wired to the strain transducer through sealing bushings. Fit a battery holder. Close the compartment with its cover on gaskets, so the electronics stay dry. Not given: the circuit, the display and the battery. Ours: a segment LCD and push buttons.
此步骤所需材料：
集成电路1 weighing and display electronics
段码液晶屏1 个
按钮1 touchpad keys
电池1 个
密封垫2 个
连接导线1 short
焊锡丝1 a little所需工具：
电烙铁螺丝刀套装3
3
Close it in the outer housing
Close it in the outer housing
Place the chassis, unfastened, between the two halves of the outer housing: a stainless-steel top with downturned sides, and a plastic bottom. Spacers moulded on the chassis sides press against the housing sides. They take a blow if the scale is dropped, and may crush on purpose to save the load cell and electronics. A sealed window of plastic or glass shows the display. A flexible sheet covers the touchpad. Fit four height-adjustable feet.
此步骤所需材料：
不锈钢板1 upper housing塑料1 lower housing
未知材料1 window, touchpad sheet, four feet所需工具：
螺丝刀套装未知尺寸4
4
Fit the pan and check
Fit the pan and check
Screw the pan support to the four supports of the load cell. Rest the removable pan on it, or snap it on, so it lifts off for washing. A flexible boot can seal each support where it passes through the housing. Ours: check the reading with calibration weights.
此步骤所需材料：
秤盘1 metal or plastic机螺钉1 套所需工具：
螺丝刀套装
校准砝码组材料
13- 1 cantilever type占位符
- 1 lower housing占位符
- 2 套占位符
- 1 weighing and display electronics占位符
- 1 个占位符
- 占位符
- 1 个占位符
- 2 个占位符
- 1 short占位符
- 1 a little占位符
- 1 upper housing占位符
- 1 window, touchpad sheet, four feet占位符
- 1 metal or plastic占位符
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