Non-contact large roundness measuring instrument

Abstract

The utility model discloses a non-contact type large roundness measuring instrument which comprises a rack, a marble workbench is arranged at the upper end of the rack, a main shaft rotating part is arranged at the upper end of the left side of the marble workbench, and a lifting stand column mechanism is arranged at the upper end of the right side of the marble workbench. A transverse arm is fixedly connected to one side of the lifting stand column mechanism, a connecting rod is fixedly connected to the lower end of the transverse arm, a non-contact capacitance sensor is fixedly connected to the lower end of the connecting rod, supporting bases are fixedly connected to the four corners of the lower end of the rack, and a computer is arranged in the rack. A movable door is movably arranged on one side of the rack, and a plurality of ventilation openings are formed in the surface of the movable door. By means of the structure, abrasion of the measuring head is avoided, the measuring speed is higher, and measurement is more accurate; the installation mode of the sensor is simpler; soft parts and parts with grooves or holes can be measured; and the surface of the workpiece is not scratched.

Description

Technical Field

[0001] The utility model relates to the technical field of roundness measurement, in particular to a non-contact large-scale roundness measuring instrument. Background Art

[0002] The existing contact-type large-scale roundness measurement has the following shortcomings:

[0003] 1. The contact-type large roundness measuring instrument uses a special fixture to determine the measurement reference point, which will lead to higher measurement costs. Products with different shapes will make the original fixture unsuitable, which will greatly increase the cost.

[0004] 2. The spherical probe of the contact sensor of the contact large roundness measuring instrument is easily worn due to the contact force. In order to maintain a certain accuracy, the diameter of the probe needs to be calibrated frequently. In addition, improper operation of the contact sensor can easily damage the surface accuracy of certain important parts of the workpiece and also damage the probe.

[0005] 3. The measuring probe of the contact type large roundness measuring instrument measures in a point-by-point manner, so the measuring speed is slow;

[0006] 4. When the contact probe of a large contact roundness measuring instrument is rubbed during measurement, the force of the contact probe will cause local deformation between the probe tip and the workpiece, thus affecting the actual reading of the measurement value;

[0007] 5. Due to the inertia and time delay of the probe trigger mechanism, the contact type large roundness measuring instrument may cause the probe to overshoot, and the speed approach will cause dynamic error;

[0008] 6. Even if the contact force of the contact-type large roundness measurement probe is constant, the measurement pressure cannot be guaranteed to be constant. This is because the contact area is related to the geometric shape of the workpiece surface texture and cannot be guaranteed to be the same;

[0009] 7. The contact-type large roundness measuring probe cannot measure soft workpieces, thin workpieces, workpieces with grooves, workpieces with holes, and inconvenient high-precision workpieces.

[0010] Therefore, a non-contact large-scale roundness measuring instrument is proposed to solve the above problems. Utility Model Content

[0011] The purpose of the utility model is to provide a non-contact large-scale roundness measuring instrument that can avoid wear of the probe, and has faster measurement speed and more accurate measurement; the sensor installation method is simpler; it can measure soft parts and parts with grooves or holes; and it does not scratch the surface of the workpiece.

[0012] To achieve the above-mentioned purpose, a non-contact large-scale roundness measuring instrument is provided, comprising: a frame, a marble workbench is provided at the upper end of the frame, a spindle rotating component is provided at the upper left end of the marble workbench, a lifting column mechanism is provided at the upper right end of the marble workbench, a cross arm is fixedly connected to one side of the lifting column mechanism, a connecting rod is fixedly connected to the lower end of the cross arm, and a non-contact capacitive sensor is fixedly connected to the lower end of the connecting rod.

[0013] According to the non-contact large-scale roundness measuring instrument, the four corners of the lower end of the frame are fixedly connected with support bases.

[0014] According to the non-contact large-scale roundness measuring instrument, a computer is provided inside the frame.

[0015] According to the non-contact large-scale roundness measuring instrument, a movable door is movably provided on one side of the frame, and a plurality of air vents are provided on the surface of the movable door.

[0016] The purpose of this utility model is to provide a non-contact large-scale roundness measuring instrument, the main innovations are:

[0017] This non-contact large-scale roundness measuring instrument avoids probe wear and has faster and more accurate measurement speeds. The sensor installation method is simpler and it can measure soft parts and parts with slots or holes without scratching the workpiece surface.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0020] Figure 1 This is a structural schematic diagram of a non-contact large-scale roundness measuring instrument proposed by the utility model.

[0021] Legend:

[0022] 1. Rack; 2. Computer; 3. Movable door; 4. Ventilation port; 5. Support base; 6. Marble workbench; 7. Spindle rotating parts; 8. Lifting column mechanism; 9. Cross arm; 10. Non-contact capacitive sensor. DETAILED DESCRIPTION

[0023] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0024] Reference Figure 1 The embodiment of the utility model is a non-contact large-scale roundness measuring instrument, which includes a frame 1, a marble workbench 6 is provided at the upper end of the frame 1, a spindle rotating component 7 is provided at the upper left end of the marble workbench 6, a lifting column mechanism 8 is provided at the upper right end of the marble workbench 6, a cross arm 9 is fixedly connected to one side of the lifting column mechanism 8, a connecting rod is fixedly connected to the lower end of the cross arm 9, and a non-contact capacitive sensor 10 is fixedly connected to the lower end of the connecting rod. The non-contact capacitive sensor 10 is specifically a capacitive displacement sensor. The capacitive displacement sensor has the characteristics of high signal-to-noise ratio, high sensitivity, wide frequency response, small nonlinearity, good accuracy and stability, and no loss.

[0025] The four corners of the lower end of the rack 1 are fixedly connected to support bases 5 to support the rack 1. A computer 2 is arranged inside the rack 1. A movable door 3 is movably provided on one side of the rack 1. A plurality of ventilation holes 4 are opened on the surface of the movable door 3.

[0026] Working Principle: This large-scale, non-contact roundness measuring instrument uses a non-contact capacitive sensor 10 to detect workpiece roundness errors. The displacement capacitive sensor is designed and developed based on the principle of an ideal plate capacitor. The object being measured and the sensor each act as a plate electrode. A continuous, stable alternating current is applied to the sensor. The amplitude of the AC voltage varies proportionally to the distance between the capacitor and the object being measured. After demodulation, the AC current can be used to measure displacement. Using this capacitive displacement sensor in a large-scale roundness measuring instrument can improve measurement accuracy and efficiency, enable measurement of workpieces with grooves or holes, and avoid measurement errors caused by probe wear.

[0027] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A non-contact large-scale roundness measuring instrument, characterized in that: include: A frame (1), wherein a marble workbench (6) is arranged at the upper end of the frame (1), a spindle rotating component (7) is arranged at the upper left end of the marble workbench (6), a lifting column mechanism (8) is arranged at the upper right end of the marble workbench (6), a cross arm (9) is fixedly connected to one side of the lifting column mechanism (8), a connecting rod is fixedly connected to the lower end of the cross arm (9), and a non-contact capacitive sensor (10) is fixedly connected to the lower end of the connecting rod.

2. A non-contact large-scale roundness measuring instrument according to claim 1, characterized in that: The four corners of the lower end of the frame (1) are fixedly connected to a supporting base (5).

3. A non-contact large-scale roundness measuring instrument according to claim 1, characterized in that: A computer (2) is arranged inside the rack (1).

4. A non-contact large-scale roundness measuring instrument according to claim 1, characterized in that: A movable door (3) is movably provided on one side of the frame (1), and a plurality of air holes (4) are provided on the surface of the movable door (3).

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