Measuring device for response time of force sensor

Abstract

The utility model provides a measuring device for the response time of a force sensor. The measuring device comprises a force output device, an oscilloscope, a first contact rod, a second contact rod and a direct-current power supply, the first contact rod is fixedly connected with a sensing area of a force sensor to be tested; the second contact rod is connected with the output end of the force output device and can be driven by the force output device to do linear reciprocating motion; the cathode of the direct-current power supply is connected to the first contact rod and the anode is connected to the second contact rod; a channel I of the oscilloscope is connected to the first contact rod and the negative electrode of the direct-current power supply; and the channel II is connected with an output signal line of a transmitter of the force sensor. The measuring device is used for monitoring the signal response time of the force sensor and the matched transmitter thereof; the design is simple, the size is small, the construction is easy, and the test is convenient; the device can be used for aging test and stability test of the force sensor, and ensures the stability and reliability of the working state.

Description

TECHNICAL FIELD

[0001] The utility model relates to performance test field, concretely relates to a kind of measurement device of force sensor response time. BACKGROUND

[0002] Force sensor is the force signal collection device commonly used in industrial processing and production, it can detect tension, tension, pressure, weight and other mechanical quantity values, and convert mechanical quantity values into electrical signals, which are transmitted through output signal lines. The quality of force sensors in the market is uneven, and the response speed also varies greatly. The response time of individual force sensors is too long, which causes the transmission of force signals to be not timely, affecting the accuracy of subsequent equipment operation. For example, in the field of visual inspection, the force sensor is required to send a signal at the same time as receiving a force signal, and the camera collects images. If the response speed of the force sensor is slow and the response time is long at this time, signal delay will occur, which will prevent the camera from accurately collecting information about the object being measured. Therefore, it is necessary to measure the response time of the force sensor to verify whether its response speed meets the standard, so as to assist workers in quickly selecting suitable force sensors. SUMMARY

[0003] To solve the above technical problems, the utility model provides a kind of measurement device of force sensor response time, the measurement device provided by the utility model is used to monitor: the signal response time of force sensor and its matching transmitter;It is simple in design, small in size, easy to build and convenient to test;It can be used for aging test and stability test of force sensor, to ensure the stability and reliability of its working state.

[0004] The technical scheme is as follows:

[0005] A kind of measurement device of force sensor response time, the force sensor is used to convert force signal into electrical signal, and it is matched with transmitter, the transmitter is used to amplify the electrical signal and output through output signal line, the output signal line includes output signal line positive and output signal line negative;

[0006] It is characterized in that the measurement device includes: force output device (1), oscilloscope (2), first contact rod (3), second contact rod (4) and DC power supply (5);

[0007] The first contact rod (3) and the second contact rod (4) are both rigid conductor rods;

[0008] The first contact rod (3) is fixedly connected with the sensing area of the force sensor (6) to be measured;

[0009] The second contact rod (4) is connected with the output end of the force output device (1) and can perform linear reciprocating motion under the driving of the force output device; the second contact rod (4) is in contact with the first contact rod (3) at the maximum forward position to apply pressure, or the second contact rod (4) tightens the first contact rod (3) at the maximum backward position to apply tension.

[0010] The negative pole of the direct current power supply (5) is connected to the first contact rod (3) and the positive pole is connected to the second contact rod (4).

[0011] The oscilloscope (2) comprises channel I and channel II.

[0012] The probe of the channel I is connected to the first contact rod (3) and the ground wire is connected to the negative pole of the direct current power supply, which is used to record the electrical signal generated at the moment when the first contact rod (3) and the second contact rod (4) are in contact.

[0013] The probe and the ground wire of the channel II are respectively connected to the positive pole and the negative pole of the output signal line of the transmitter (7) of the force sensor, which is used to record the response signal output by the force sensor.

[0014] Further, the force output device (1) is a bidirectional air cylinder or a linear motor.

[0015] Further, the force sensor is a tension and compression bidirectional bearing force sensor; the first contact rod (3) and the second contact rod (4) are both L-shaped rods, and the second contact rod (4) is in contact with the first contact rod (3) at the maximum forward position to apply pressure.

[0016] The first contact rod (3) and the second contact rod (4) are connected to each other and are in a relaxed state, and the second contact rod (4) tightens the first contact rod (3) at the maximum backward position to apply tension.

[0017] Further, the force sensor is a tension sensor; the first contact rod (3) and the second contact rod (4) are both L-shaped rods or hook rods, and are connected to each other and are in a relaxed state, and the second contact rod (4) tightens the first contact rod (3) at the maximum backward position to apply tension.

[0018] Further, the force sensor is a pressure sensor; the first contact rod (3) and the second contact rod (4) are both straight rods or L-shaped rods, and the second contact rod (4) is in contact with the first contact rod (3) at the maximum forward position to apply pressure.

[0019] Preferably, the first contact rod (3) and the second contact rod (4) are iron rods or steel rods.

[0020] The utility model discloses design scheme: utilize the oscilloscope's double channel to receive the response signal of the force sensor and the instantaneous generation of the force applied, obtain the response time of sensor through the time difference of both's contrast, the device is easy to build, and test is convenient, can obtain the response time of force sensor quickly, is applicable to the aging test, stability test of each type force sensor, ensures the stability and reliability of its working condition. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 For the schematic diagram of the measuring device in the specific embodiment. DETAILED DESCRIPTION

[0022] The technical scheme of the utility model is described in detail below in combination with the drawings and specific embodiments.

[0023] A kind of force sensor response time's measuring device, force sensor is used to convert force signal into electric signal, it is equipped with transmitter 7, transmitter is used to amplify electric signal and is output through output signal line, output signal line includes output signal line positive and output signal line negative;

[0024] As Figure 1 As shown, the measuring device includes: force output device (1), oscilloscope (2), first contact rod (3), second contact rod (4) and DC power supply (5);

[0025] First contact rod (3) and second contact rod (4) are rigid conductor rods, preferably, adopt iron pole or steel pole;

[0026] First contact rod (3) is fixedly connected with the sensing area of the force sensor (6) to be measured;

[0027] Second contact rod (4) is connected with the output end of force output device (1), and can perform linear reciprocating motion under the driving of force output device;

[0028] When detecting the response time of pressure signal:

[0029] Second contact rod (4) is in abutment with first contact rod (3) at the maximum forward position and applies pressure;

[0030] When detecting the response time of tension signal:

[0031] First contact rod (3) and second contact rod (4) are mutually hooked and in a relaxed state, and second contact rod (4) tightens first contact rod (3) at the maximum backward position and applies tension;

[0032] The negative pole of DC power supply (5) is connected to first contact rod (3), and the positive pole is connected to second contact rod (4);

[0033] The oscilloscope (2) includes channel I and channel II;

[0034] The probe of channel I is connected to the first contact rod (3) and the ground wire is connected to the negative terminal of the DC power supply. It is used to record the electrical signal generated at the moment when the first contact rod (3) and the second contact rod (4) come into contact.

[0035] The probe and ground wire of channel II are connected to the positive and negative output signal lines of the transmitter (7) of the force sensor, respectively, and are used to record the response signal emitted by the force sensor.

[0036] In use, the response time (delay time) is obtained by comparing the time difference between the signals recorded by Channel I and Channel II.

[0037] Among them, the force output device (1) is a two-way cylinder or a linear motor.

[0038] For example, such as Figure 1 As shown, in this embodiment, a bidirectional cylinder is selected. During operation, a constant pressure air source, a switching valve, a reversing valve, and a cylinder are connected in series. Each valve is connected to a valve controller. The valve controller controls the reversing valve to connect the air source to the thrust chamber, opens the switching valve, and a constant pressure is injected into the cylinder's thrust chamber, pushing the second contact rod (4) forward and contacting the first contact rod (3) at the maximum forward position, applying pressure. At the moment of contact, the circuit is turned on, and the signal measured by oscilloscope channel I becomes high level. This signal is used as the starting time of the force sensor being subjected to force. Channel II simultaneously collects the output signal of the transmitter, and the response time of the pressure signal is measured by comparing the signals of the two channels.

[0039] The first contact rod (3) and the second contact rod (4) are connected to each other and in a relaxed state; the valve controller controls the reversing valve to connect the air source to the tension chamber, opens the switch valve, and a constant air pressure is filled into the tension chamber of the cylinder, pulling the second contact rod (4) backward and tightening the first contact rod (3) at the maximum backward position, applying tension; the second contact rod (4) tightens the first contact rod (3), and the circuit is turned on at the moment of tightening. The signal measured by oscilloscope channel I becomes high level, and this signal is used as the starting time of the force sensor being subjected to force. Channel II simultaneously collects the output signal of the transmitter, and the response time of the pressure signal is measured by comparing the signals of the two channels.

[0040] More specifically, the measuring device provided in this design can be used to detect bidirectional load-bearing sensors, tension sensors, and pressure sensors.

[0041] When the force sensor is a bidirectional load-bearing force sensor for both tension and compression, it can detect both pressure and tension. During testing, both the first contact rod 3 and the second contact rod 4 are L-shaped rods.

[0042] When detecting the response time of the pressure signal:

[0043] First, the first contact rod (3) and the second contact rod (4) are not in contact and are in a relaxed state, and the second contact rod (4) is in contact with the first contact rod (3) at the maximum forward position and applies pressure.

[0044] When detecting the response time of the tension signal:

[0045] The first contact rod (3) and the second contact rod (4) are hooked to each other and are in a relaxed state, and the second contact rod (4) tightens the first contact rod (3) at the maximum backward position and applies tension.

[0046] When the force sensor is a tension sensor, it can only detect tension; during testing, the first contact rod (3) and the second contact rod (4) are both L-shaped rods or hook rods, and are hooked to each other and are in a relaxed state, and the second contact rod (4) tightens the first contact rod (3) at the maximum backward position and applies tension.

[0047] When the force sensor is a pressure sensor, it can only detect pressure; the first contact rod (3) and the second contact rod (4) are both straight rods or L-shaped rods, and the second contact rod (4) is in contact with the first contact rod (3) at the maximum forward position and applies pressure.

[0048] The foregoing description of specific exemplary embodiments of the detection system is presented for the purposes of illustration and description. It is not intended to be exhaustive or to be limited to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teachings.

Claims

1. A device for measuring the response time of a force sensor for converting a force signal into an electric signal, which is equipped with a transmitter for amplifying the electric signal and outputting it through an output signal line comprising a positive output signal line and a negative output signal line; characterized in that The measuring device comprises a force output device (1), an oscilloscope (2), a first contact rod (3), a second contact rod (4) and a DC power supply (5); The first contact rod (3) and the second contact rod (4) are both rigid conductor rods; The first contact rod (3) is fixedly connected to the sensing area of the force sensor (6) to be measured; The second contact rod (4) is connected to the output end of the force output device (1) and can perform linear reciprocating motion under the driving of the force output device; the second contact rod (4) abuts against the first contact rod (3) and exerts pressure at the maximum forward position, or the second contact rod (4) tightens the first contact rod (3) and exerts tension at the maximum backward position; The negative electrode of the DC power supply (5) is connected to the first contact rod (3), and the positive electrode is connected to the second contact rod (4); The oscilloscope (2) comprises channel I and channel II; The probe of channel I is connected to the first contact rod (3), and the ground wire is connected to the negative electrode of the DC power supply, which is used to record the electric signal generated at the moment when the first contact rod (3) and the second contact rod (4) abut against each other; The probe and the ground wire of channel II are respectively connected to the positive output signal line and the negative output signal line of the transmitter (7) of the force sensor, which is used to record the response signal output by the force sensor.

2. The device for measuring the response time of a force sensor according to claim 1, characterized in that: The force output device (1) is a bidirectional air cylinder or a linear motor.

3. The apparatus for measuring the response time of a force sensor as claimed in claim 1, wherein: The force sensor is a bidirectional load-bearing force sensor for tension and compression; the first contact rod (3) and the second contact rod (4) are both L-shaped rods.

4. The apparatus for measuring the response time of a force sensor as claimed in claim 1, wherein: The force sensor is a tension sensor; the first contact rod (3) and the second contact rod (4) are both L-shaped rods or hook rods.

5. The apparatus for measuring the response time of a force sensor as claimed in claim 1, wherein: The force sensor is a pressure sensor; the first contact rod (3) and the second contact rod (4) are straight rods or L-shaped rods.

6. The apparatus of claim 1, wherein: The first contact rod (3) and the second contact rod (4) are iron rods or steel rods.

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