Comprehensive performance inspection device for handheld electric tool

Abstract

The utility model belongs to the field of handheld electric tool testing, and provides a handheld electric tool comprehensive performance testing device which comprises a base, a no-load power measuring assembly and an insulation resistance measuring assembly are arranged on the base, and the no-load power measuring assembly comprises a detection wheel capable of moving along a Z axis. The detection wheel is provided with a measuring unit, the measuring unit is connected with a controller, and a plurality of fixing clamps for clamping electric tools are arranged on the outer side of the lifting support on the base. The insulation resistance measuring assembly comprises two conductive sponges which are oppositely arranged up and down; according to the utility model, the inflatable air bag pushes the conductive cloth to fully cover the tool shell, the measurement contact area is increased, the test missing rate of insulation resistance test is reduced, the insulation resistance test tool is suitable for electric tools of different types and sizes, the handle of the electric tool is fixed through the two clamp plates, and the filling air bag is inflated, so that the insulation resistance test tool is more stable and reliable. The electric tools of different sizes can be clamped in a self-adaptive mode.

Description

Technical Field

[0001] This utility model belongs to the field of handheld power tool testing, specifically a comprehensive performance testing device for handheld power tools. Background Technology

[0002] Handheld power tools are widely used in many fields such as industrial production, construction, and home renovation, bringing great convenience to people's work and life. However, these tools come into direct contact with the human body during use, making their electrical safety performance crucial. No-load power and insulation resistance are core indicators for measuring the electrical safety performance of handheld power tools.

[0003] Currently, fixed electrodes are used in insulation resistance testing of handheld power tools, which have limited contact area and are prone to poor contact due to the curved surface of the tool shell. In addition, insulation resistance testing requires manual application of conductive paste to enhance contact, which poses a risk of contaminating the tool with conductive paste. As a result, the accuracy and reliability need to be improved when facing complex working conditions and different environmental conditions. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides a comprehensive performance testing device for handheld power tools. This device solves the problem that existing insulation resistance tests use fixed electrodes with limited contact area, resulting in insufficient accuracy and reliability when facing complex working conditions and different environmental conditions.

[0005] A comprehensive performance testing device for handheld power tools includes a base, on which an unloaded power measuring component and an insulation resistance measuring component are mounted;

[0006] The no-load power measurement component includes a detection wheel that can move along the Z-axis. A measurement unit is provided on the detection wheel. The measurement unit is connected to a controller for measuring insulation resistance, no-load speed, and no-load current. Several fixing clamps for holding power tools are provided on the outer side of the lifting bracket on the base.

[0007] The insulation resistance measuring component includes two conductive sponges arranged opposite each other to wrap the power tool housing.

[0008] Preferably, the no-load power measurement component further includes a support plate for mounting the measurement unit and the detection wheel, and the support plate is also provided with a lifting bracket for driving the support plate to move along the Z-axis.

[0009] Preferably, the insulation resistance measuring assembly further includes a housing mounted on a base, a top cover hinged to the housing, two conductive sponges respectively disposed inside the housing and the top cover, and a notch groove provided on the side of the housing for leading out the power cable of the power tool.

[0010] Preferably, the conductive sponge includes an inflatable air bladder, on which a sponge layer is disposed, and on the outer side of the sponge layer is a conductive cloth.

[0011] Preferably, the two fixing clamps are of different sizes, and the fixing clamps include two clamp plates that are hinged to each other. An air bladder is provided on the inner side of the clamp plate, and an air supply component is provided between the air bladder and the air bladder.

[0012] Preferably, the air supply assembly includes a three-way pipe connected to two three-way valves. One end of the three-way pipe is connected to an inflation pipe second for connecting two inflatable airbags. Each of the two three-way valves is provided with an inflation pipe first, which is connected to the corresponding inflatable airbag.

[0013] Preferably, the measuring unit is an encoder.

[0014] Preferably, the controller consists of a main control unit, a power management module, an insulation resistance measurement module, an encoder interface circuit, a display module, and a non-contact current measurement module.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. This utility model uses an inflatable airbag to push the conductive cloth to fully cover the tool shell, which increases the contact area compared with the traditional method, reduces the test omission rate of insulation resistance test, and can be applied to power tools of different types and sizes.

[0017] 2. This utility model uses two clamp plates to fix the handle of the power tool and uses the inflation of the filling air bag to achieve adaptive clamping of the power tool, which can adapt to power tools of different sizes for no-load power testing. Attached Figure Description

[0018] Figure 1 This is a first-view perspective three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is a second-view perspective three-dimensional structural diagram of the present invention;

[0020] Figure 3 This is a schematic diagram of the third-view three-dimensional structure of this utility model.

[0021] In the picture:

[0022] 1. Base; 2. No-load power measurement component; 201. Lifting bracket; 202. Support plate; 203. Detection wheel; 204. Measurement unit; 3. Insulation resistance measurement component; 301. Box body; 302. Top cover; 303. Conductive sponge; 3031. Inflatable airbag; 3032. Sponge layer; 3033. Conductive cloth; 4. Controller; 5. Air supply component; 501. Three-way pipe; 502. Three-way valve; 503. Inflation pipe one; 504. Inflation pipe two; 6. Notch groove; 7. Fixing clamp; 701. Clamp plate; 702. Filling airbag; 703. Positioning bolt. Detailed Implementation

[0023] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0024] As attached Figure 1 To be continued Figure 3 As shown:

[0025] This utility model provides a comprehensive performance testing device for handheld power tools, which consists of a base 1, an unloaded power measuring component 2, an insulation resistance measuring component 3, a controller 4, and an air supply component 5, achieving high-precision testing and adaptability to all scenarios.

[0026] As attached Figure 1 To be continued Figure 3 As shown: Base 1 consists of a rubber damping pad and a metal plate. The rubber damping pad is made of nitrile rubber, which can absorb vibration energy and achieve noise reduction and vibration damping.

[0027] As attached Figure 2 To be continued Figure 3 As shown: The no-load power measurement component 2 includes a lifting bracket 201 for driving the support plate 202 to move up and down along the Z-axis. The lifting bracket 201 uses a lead screw and sleeve to drive the support plate 202 to move. It can be lifted manually or electrically. The electric lifting uses a servo motor to drive the Z-axis to move up and down, and the height of the drive axis is determined by a laser rangefinder sensor. A detection wheel 203 is rotatably mounted on the support plate 202. Its surface is covered with a rubber layer, and a measurement unit 204 is mounted on it. The measurement unit 204 uses a 2000-line incremental encoder to collect the rotational speed.

[0028] As attached Figure 1 To be continued Figure 3As shown: The insulation resistance measuring assembly 3 includes a housing 301 and a top cover 302. The housing 301 and the top cover 302 are closed to form a receiving cavity adapted to the contour of the tool. Conductive sponges 303, serving as electrodes, are provided on both the housing 301 and the top cover 302. Each sponge includes a sponge 3032 externally wrapped with conductive cloth 3033, and an inflatable airbag 3031 inside. When inflated, the airbag 3031 expands, pushing the conductive cloth 3033 tightly against the tool's outer shell, increasing the contact area compared to traditional electrodes. The housing 301 also has a notch 6 for leading out the power tool's transmission cable.

[0029] As attached Figure 1 To be continued Figure 3 As shown, controller 4 consists of a main control unit, a power management module, an insulation resistance measurement module, an encoder interface circuit, a display module, and a non-contact current measurement module. The main control unit uses an STM32 processor with a multi-channel ADC for analog signal acquisition. The insulation resistance measurement module consists of a high-voltage generation circuit and a voltage divider detection circuit, with a range of 0-3000MΩ, an accuracy of ±2%, and supports automatic switching between 500V and 1000V test voltages. The non-contact current measurement module consists of a Hall sensor and a signal conditioning circuit. The display module uses a 7-inch color touchscreen to display test data in real time and interfaces with the MES system via an RS485 interface; test results are automatically uploaded to the quality management database.

[0030] As attached Figure 1 To be continued Figure 3 As shown: The fixing clamp 7 includes a pair of clamping plates 701 hinged to both sides of the base. An inflatable air bladder 702 is adhered to the inner side of each clamping plate. When inflated, it can adaptively conform to the curved surface of the tool handle. The clamping range diameter of one side of the fixing clamp 7 is 20-50mm, and the clamping range diameter of the other side is 45-90mm, compatible with mainstream tools such as electric drills, angle grinders, and jigsaws. The clamping plates 701 are hinged using positioning bolts 703, facilitating the restriction of the opening and closing of the clamping plates 701.

[0031] As attached Figure 1 To be continued Figure 3 As shown: The air supply assembly 5 includes a three-way pipe 501 connected to a three-way valve 502 and an inflation pipe 504. The inflation pipe 504 connects to two inflatable air bags 3031. The two three-way valves 502 are respectively connected to the filling air bags 702 on the corresponding two fixing clamps 7 through an inflation pipe 503. This enables independent air supply to the filling air bags 702 of the fixing clamps and the inflatable air bags 3031 of the insulation assembly.

[0032] Working principle:

[0033] Place the electric drill horizontally on the base 1, loosen the clamp plate 701, and adjust it so that the central axis of the handle is aligned with the detection wheel 203 using the positioning bolt 703. Tighten the bolt to secure it. Close the insulation component cover 302, and the air supply component 5 automatically inflates the filling air bladder 702 and the inflation air bladder 3031. The conductive cloth 3033 completely covers the electric drill shell.

[0034] No-load power test: Control the lifting bracket 201 to descend, and the detection wheel 203 contacts the drive shaft. Start the electric drill to the no-load state. The detection wheel 203 contacts the tool drive shaft, and the tool rotation drives the detection wheel to rotate. The encoder outputs speed pulse signals in real time. At the same time, the clamp current clamp is connected to the interface of the controller 4. The clamp current clamp is used to test the power cord of the power tool and test the current.

[0035] Insulation resistance test: After the inflatable airbag 3031 expands, the conductive cloth 3033 and the tool shell form a full-surface conductive path. The controller 4 applies the test voltage and measures the leakage current. The insulation resistance value is calculated according to Ohm's law. The filling airbag 702 ensures that the tool does not shift during the test, improving data repeatability.

[0036] The embodiments of this utility model are given for the purpose of illustration and description. Although embodiments of this utility model have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the utility model. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this utility model.

Claims

1. A comprehensive performance testing device for handheld power tools, comprising a base (1), characterized in that: The base (1) is provided with an unloaded power measurement component (2) and an insulation resistance measurement component (3); The no-load power measurement component (2) includes a detection wheel (203) that can move along the Z-axis. A measurement unit (204) is provided on the detection wheel (203). The measurement unit (204) is connected to a controller (4) for measuring insulation resistance, no-load speed and no-load current. Several fixing clamps (7) for holding power tools are provided on the outside of the lifting bracket (201) on the base (1). The insulation resistance measuring component (3) includes two conductive sponges (303) arranged opposite each other to wrap the power tool housing.

2. The handheld power tool comprehensive performance testing device as described in claim 1, characterized in that: The no-load power measurement component (2) also includes a support plate (202) for mounting the measurement unit and the detection wheel (203). The support plate (202) is also provided with a lifting bracket (201) for driving the support plate (202) to move along the Z-axis.

3. The handheld power tool comprehensive performance testing device as described in claim 1, characterized in that: The insulation resistance measuring assembly (3) also includes a housing (301) mounted on a base (1). A top cover (302) is hinged to the housing (301). Two conductive sponges (303) are respectively mounted inside the housing (301) and the top cover (302). A notch (6) is provided on the side of the housing (301) for leading out the power cord of the power tool.

4. The handheld power tool comprehensive performance testing device as described in claim 3, characterized in that: The conductive sponge (303) includes an inflatable airbag (3031), on which a sponge layer (3032) is provided, and on the outside of the sponge layer (3032) a conductive cloth (3033) is provided.

5. The handheld power tool comprehensive performance testing device as described in claim 4, characterized in that: The two fixing clamps (7) are different in size. The fixing clamp (7) includes two clamp plates (701) that are hinged to each other. An air-filled bladder (702) is provided on the inner side of the clamp plate (701). An air supply assembly (5) is provided between the air-filled bladder (3031) and the air-filled bladder (702).

6. The handheld power tool comprehensive performance testing device as described in claim 5, characterized in that: The air supply assembly (5) includes a three-way pipe (501) connected to two three-way valves (502). One end of the three-way pipe (501) is connected to an inflation pipe (504) for connecting two inflatable airbags (3031). Each of the two three-way valves (502) is provided with an inflation pipe (503), which is connected to the corresponding filling airbag (702).

7. The handheld power tool comprehensive performance testing device as described in claim 1, characterized in that: The measurement unit (204) is an encoder.

8. The handheld power tool comprehensive performance testing device as described in claim 1, characterized in that: The controller (4) consists of a main control unit, a power management module, an insulation resistance measurement module, an encoder interface circuit, a display module, and a non-contact current measurement module.

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