CN218330175U

CN218330175U - Analog weighing force-measuring transmitter with adjustable sensitivity range and output frequency

Info

Publication number: CN218330175U
Application number: CN202221652225.1U
Authority: CN
Inventors: 盛兴华
Original assignee: Hangzhou Feishun Intelligent Technology Co ltd
Current assignee: Hangzhou Feishun Intelligent Technology Co ltd
Priority date: 2022-06-28
Filing date: 2022-06-28
Publication date: 2023-01-17
Anticipated expiration: 2032-06-28

Abstract

The utility model relates to a sensitivity scope and output frequency adjustable simulation dynamometry changer of weighing, including changer and shell, the positive fixed mounting of changer has the regulation potentiometer at zero point, the front of changer and the below fixed mounting that is located the regulation potentiometer at zero point have the regulation potentiometer of gain, the front of changer and the below fixed mounting that is located the regulation potentiometer of gain have the dial switch that is used for adjusting output frequency. The analog weighing force-measuring transducer with adjustable sensitivity range and output frequency controls the amplification factor by dialing a dial switch on the transducer, and finely adjusts the amplification factor by a potentiometer. The zero point adjustment is to provide a compensation value for the output signal, select a zero point range through a dial switch, and adjust the zero point compensation value in the selected zero point range through a potentiometer. The circuit board is fixed in the shell a through the clamping groove, the two sides of the machine body are fixed through the baffle plates b through screws, and the two round holes d in the front of the machine body are used for adjusting the potentiometer.

Description

Analog weighing force-measuring transmitter with adjustable sensitivity range and output frequency

Technical Field

The utility model relates to a changer technical field of weighing specifically is a sensitivity scope and output frequency adjustable simulation dynamometry changer of weighing.

Background

The weighing transmitter is a transmitter commonly used in the industrial weighing process, is widely applied to a data acquisition, signal transmission conversion and distributed weighing control system and a batching system, and is mainly applied to the transmission, display, detection and the like of weighing type material level, weight load, tension and tension pressure signals in the industries of robots, medical fields, press fitting industries, machine building/civil engineering, new retail fields, agriculture, new energy sources, 3C and the like.

The sensors on the market are various, the sensitivity range is different from 0.2mV/V to 4mV/V, the amplification factor adjusting range of the transmitter needs to be as large as possible to be matched with the sensors with different sensitivities, the transmitter needs to be matched with the sensitivities in various ranges, the larger the amplification factor range is, the better the sensitivity range is, the wider the sensitivity range can be matched with, but the larger the amplification factor of the transmitter is, the difficulty in calibration can be increased, the larger the amplification factor range is selected by the potentiometer, the larger the required resistance value range is, and therefore the resistance value can be changed greatly as long as the potentiometer is slightly screwed, and the user can hardly adjust the calibration time. Meanwhile, the higher the output frequency of the transmitter is, namely the larger the output signal data volume is, the more data the CPU receives is, the more data is obtained, and meanwhile, the storage space of the CPU is wasted, so that the storage of effective signals is limited, the time and complexity of data post-processing are increased, but the lower the output frequency is, the lower the information data received by the CPU is, and the whole test may not have any value. Almost all analog transmitters on the market have fixed output frequencies, and one transmitter has only one output frequency, so that when a CPU needs different data volumes, the transmitter with the corresponding frequency needs to be replaced.

SUMMERY OF THE UTILITY MODEL

The utility model provides a not enough to prior art, the utility model provides a sensitivity scope and output frequency adjustable simulation dynamometry changer of weighing possesses advantages such as zero point range selection and regulation, sensitivity scope selection and magnification fine setting, output frequency selection, has solved the problem that different grade type sensor needs different changer adaptations. Meanwhile, the output frequency is selectable, so that the problem that the transmitter with the corresponding frequency needs to be replaced when the CPU needs different data volumes is solved.

In order to achieve the above purpose, the utility model provides a following technical scheme: the utility model provides a sensitivity scope and output frequency adjustable simulation dynamometry changer of weighing, includes changer and shell, the positive fixed mounting of changer has the regulation of zero potentiometer, the front of changer and the below fixed mounting that is located the regulation of zero potentiometer have the regulation of gain potentiometer, the front of changer and the below fixed mounting that is located the regulation of gain potentiometer have frequency modulation dial switch, the positive right side fixed mounting of changer has the dial switch that is used for sensitivity scope to select, the left side fixed mounting of changer has voltage, current output terminal, the left side of changer and the below fixed mounting that is located voltage, current output terminal have the power supply input, the right side fixed mounting of changer has sensor interface.

The positive fixed mounting of changer has positive negative voltage converting circuit, the front of changer just is located the below fixed mounting of positive negative voltage converting circuit has linear voltage stabilizing circuit, the front of changer just is located linear voltage stabilizing circuit's below and installs the excitation voltage circuit, the front of changer just is located positive negative voltage converting circuit's right side fixed mounting has sensor input filter circuit, the front of changer just is located positive negative voltage converting circuit's top fixed mounting has one-level amplifier circuit, the front of changer just is located one-level amplifier circuit's left side fixed mounting has second grade amplifier circuit, the front of changer just is located second grade amplifier circuit's top fixed mounting has the zero set circuit, the front of changer just is located zero set circuit's left side fixed mounting has voltage, current converting circuit, the front of changer just is located voltage, current converting circuit's top fixed mounting has output filter circuit.

Further, the sensor is provided with optional 5V, 10V or 12V excitation voltage, and transmits a millivolt signal to the transmitter.

Further, the output end of the SW2 dial switch is electrically connected with the input end of the second-stage amplifying circuit.

Further, the input signal of the sensor is amplified by the sensor input filter circuit and the two-stage amplifying circuit and then filtered by the output filter circuit to output +/-10V, and meanwhile, the filtered signal is output to the voltage and current conversion circuit and converted into 0-20mA and 4-20mA currents to be output.

Furthermore, the transmitter receives external 15-30V power supply, and the power is converted into +/-12V voltage through the linear voltage stabilizing circuit and the positive and negative voltage conversion circuit to supply power to the internal circuit.

Furthermore, the SW2 dial switch selects the amplification factor (namely the sensitivity of the sensor) through dial, then fine tuning is carried out through the gain adjustment potentiometer, a proper sensitivity range is selected through the dial switch, and the amplification factor is fine tuned through the gain adjustment potentiometer after the dial is finished.

Further, the SW2 dial switch selects a zero point range through dial, and then the zero point compensation value is finely adjusted in the selected zero point range through the zero point adjusting potentiometer.

Further, the SW1 dial switch is connected to the output filter circuit and used for adjusting the frequency of the output signal.

Compared with the prior art, the technical scheme of the application has the following beneficial effects:

1. this sensitivity range and output frequency adjustable simulation dynamometry transmitter of weighing, through setting up SW2 dial switch, traditional amplifier only does the one-level amplifier circuit, we have increased second grade amplifier circuit, the amplification is one-level amplification times second grade amplification, select the amplification through the dial switch, rethread potentiometre finely tunes, dial out one approximate multiple (select sensitivity range promptly) earlier through the dial switch, finely tune through the potentiometre after dialling, the potentiometre resistance of using like this can be very little, twist the screw on the potentiometre and also transfer to the voltage output that needs more easily, just it is simpler during the demarcation, for connecting the sensor of different sensitivities, we can select suitable sensitivity range to realize through the dial switch on the dial transmitter. Zero point adjustment is a compensation value for an output signal, the zero point can be adjusted, the zero point range is adjusted through reference voltage, 2 conditions exist in the calibrated zero point, one condition is that 0V is used as the zero point, the other condition is that 5V is used as the zero point when 0-10V is output, the zero point needs to be adjusted to 2 steps, the first step is adjusted near 0V, the range is set in a certain voltage range taking 0V as the center, such as-2.5V, and the adjustment is easy; if 5V is needed as the zero point, the adjusting range can be set in a range larger than +/-5V, such as-6V; through the setting of the dial switch, the zero point can be adjusted to 0V or 5V, the zero point is easy to adjust when 0V is used as the zero point, and 5V can be used as the zero point.

2. This sensitivity range and output frequency adjustable simulation dynamometry transmitter of weighing, through setting up SW1 dial switch, the transmitter still has a filter circuit after enlargiing, plays the effect of filtering output signal clutter, and the frequency of inside transmitter is very fast, can reach tens kilohertz's frequency. The frequency of the output filter circuit is limited, the output frequency of the output filter circuit is limited, and the filter circuit is realized by adjusting parameters of the filter circuit. This is a low pass filter, low frequency signals can pass, high frequency signals do not. Suppose we set the parameters of the low pass filter at 10K, i.e. signals smaller than 10K can pass, and signals larger than 10K cannot pass. A plurality of different output frequencies can be set by the dial switch, for example 2-step frequencies, one 1K and the other 10K, which are adjusted by the dial switch SW 1.

Drawings

Fig. 1 is a schematic diagram of the circuit structure of the present invention;

FIG. 2 is a schematic diagram of the first and second stage amplifying circuits and the SW2 dial switch of the present invention;

FIG. 3 is a schematic diagram of the operation of the SW2-5 toggle switch of the SW2 toggle switch for selecting the zero range and the SW2 toggle switch of the present invention;

FIG. 4 is a schematic diagram of the output frequency selection and SW1 dial switch operation of the present invention;

fig. 5 is a schematic diagram of the transmitter of the present invention.

In the figure: 1. a zero adjustment potentiometer; 2. a gain adjustment potentiometer; 3. an SW1 dial switch; 4. an SW2 dip switch; 5. voltage and current output terminals; 6. a power supply input terminal; 7. a sensor interface; A. a power input protection and filter circuit; B. a positive-negative voltage conversion circuit; C. a linear voltage stabilizing circuit; D. an excitation voltage circuit; E. a sensor input filter circuit; F. a first-stage amplifying circuit; G. a secondary amplifying circuit; H. a zero setting circuit; I. a voltage-current conversion circuit; J. an output filter circuit; a. a housing body; b. a left baffle and a right baffle; c. screw fixing holes; d. a potentiometer adjustment aperture; e. and (4) a cabinet mounting hole.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-4, an analog weighing and force measuring transducer with adjustable sensitivity range and output frequency in the present embodiment includes a transducer and a housing, a zero-point adjustment potentiometer 1 is fixedly installed on the front surface of the transducer, a gain adjustment potentiometer 2 is fixedly installed on the front surface of the transducer and below the zero-point adjustment potentiometer 1, a SW1 dial switch 3 is fixedly installed on the front surface of the transducer and below the gain adjustment potentiometer 2, an sw2 dial switch 4 selects an amplification factor through the dial switch, the amplification factor is finely adjusted through the gain adjustment potentiometer 2, an appropriate amplification factor (sensitivity range) is selected through the SW2 dial switch 4, the amplification factor is finely adjusted through the gain adjustment potentiometer 2 after being dialed, the zero-point adjustment range can be selected through the SW2 dial switch 4, the zero-point fine adjustment output of the potentiometer 1 is adjusted through a zero-point, the SW2 dial switch 4 is fixedly installed on the right side of the front surface of the transducer, a voltage and current output end 5 is fixedly installed on the left side of the transducer and below the voltage and current output end 5, and a sensor interface 7 is fixedly installed on the right side of the transducer;

the positive and negative voltage conversion circuit B is fixedly installed on the front of the transmitter, a linear voltage stabilizing circuit C is fixedly installed on the front of the transmitter and below the positive and negative voltage conversion circuit B, an excitation voltage circuit D is installed on the front of the transmitter and below the linear voltage stabilizing circuit C, a sensor input filter circuit E is fixedly installed on the front of the transmitter and on the right side of the positive and negative voltage conversion circuit B, a first-stage amplification circuit F is fixedly installed on the front of the transmitter and on the positive and negative voltage conversion circuit B, a second-stage amplification circuit G is fixedly installed on the front of the transmitter and on the left side of the first-stage amplification circuit F, a zero setting circuit H is fixedly installed on the front of the transmitter and on the top of the second-stage amplification circuit G, a voltage and current conversion circuit I is fixedly installed on the front of the transmitter and on the left side of the zero setting circuit H, and an output filter circuit J is fixedly installed on the front of the transmitter and on the top of the voltage and current conversion circuit I.

When the method is implemented, the method comprises the following steps:

1) Firstly, selecting a required sampling frequency through the SW1 dial switch 3, and then, toggling the SW2 dial switch 4 according to the sensitivity of the selected sensor to select a corresponding sensitivity range (namely, amplification factor);

2) Then a 15-30V power supply is supplied on the power supply input end 6, the voltage and current output ends 5 are output voltage and current ports, and the sensor interface 7 is a sensor access end;

3) Calibrating zero point, no load of the sensor is loaded, no weight is pressed, the zero point adjusting potentiometer 1 is screwed, and the voltage and current output end 5 outputs corresponding zero point voltage or current;

4) And finally calibrating a gain point, pressing the sensor to the full-scale weight, and screwing the gain adjusting potentiometer 2 to enable the voltage and current output end 5 to output voltage or current corresponding to the gain.

In summary, the analog weighing force-measuring transducer with adjustable sensitivity range and output frequency is realized by setting the SW2 dial switch 4, only using a traditional amplifier as a primary amplifying circuit F and adding a secondary amplifying circuit, wherein the amplification factor is the primary amplification factor multiplied by the secondary amplification factor, selecting the amplification factor through the dial switch, then finely adjusting through the potentiometer, firstly dialing out an approximate multiple (namely selecting the sensitivity range) through the dial switch, and finely adjusting through the potentiometer after dialing, so that the resistance value of the potentiometer is small, a screw on the potentiometer is easily adjusted to the required voltage output, the calibration is simple, and for connecting sensors with different sensitivities, the transducer can select the appropriate sensitivity range through the dial switch on the dial switch. Zero point adjustment is a compensation value for an output signal, the zero point can be adjusted, the zero point range is adjusted through reference voltage, 2 zero points are calibrated, one zero point is 0V and is used as the zero point, the other zero point is 5V and is used as the zero point when 0-10V is output, the zero point needs to be adjusted to 2 steps, the first step is adjusted near 0V, the range is set in a certain voltage range taking 0V as the center, for example, -2.5V, and the adjustment is easy; if 5V is needed as the zero point, the adjusting range can be set in a range larger than +/-5V, such as-6V; through the setting of the dial switch, the zero point can be adjusted to 0V or 5V, the zero point is easy to adjust when 0V is used as the zero point, and 5V can be used as the zero point.

In this embodiment, by setting the SW1 dial switch 3, the transmitter has a filter circuit after amplification to filter noise of the output signal, the frequency of the internal transmitter is fast and can reach a frequency of tens of kilohertz, and the frequency of the output filter circuit is limited to limit the output frequency thereof, and the noise filtering is realized by adjusting parameters of the filter circuit. This is a low pass filter through which low frequency signals can pass and through which high frequency signals do not. Suppose we set the parameters of the low pass filter at 10K, i.e. signals smaller than 10K can pass, signals larger than 10K cannot. A plurality of different output frequencies can be set by the dial switches, for example 2 steps of frequency, one 1K and the other 10K, which are adjusted by the dial switches SW 1.

It should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a sensitivity scope and output frequency adjustable simulation dynamometry transmitter of weighing, includes changer and shell, its characterized in that: the positive fixed mounting of changer has zero point adjustment potentiometre (1), the below fixed mounting that the front of changer just is located zero point adjustment potentiometre (1) has gain adjustment potentiometre (2), the front of changer just is located the below fixed mounting of gain adjustment potentiometre (2) has frequency control SW1 dial switch (3), the positive right side fixed mounting of changer has SW2 dial switch (4) that is used for selecting the sensitivity scope, the left side fixed mounting of changer has voltage, current output part (5), the left side of changer just is located the below fixed mounting of voltage, current output part (5) has power supply input end (6), the right side fixed mounting of shell has sensor interface (7),

external power supply enters into power protection and filter circuit (A) through power input end (6) in the changer, the positive fixed mounting of changer has positive negative voltage converting circuit (B), the front of changer and the below fixed mounting that is located positive negative voltage converting circuit (B) have linear voltage stabilizing circuit (C), excitation voltage circuit (D) is installed to the front of changer and the below that is located linear voltage stabilizing circuit (C), the front of changer and the right side fixed mounting that is located positive negative voltage converting circuit (B) have sensor input filter circuit (E), the front of changer and the top fixed mounting that is located positive negative voltage converting circuit (B) have one-level amplifier circuit (F), the front of changer and the left side fixed mounting that is located one-level amplifier circuit (F) have second grade amplifier circuit (G), the front of changer and the top fixed mounting that is located second grade amplifier circuit (G) have zero setting circuit (H), the front of changer and the left side fixed mounting that is located zero setting circuit (H) have voltage, current converting circuit (I), the front of changer and the top fixed mounting that is located voltage, current converting circuit (I) have output filter circuit (J).

2. The analog weighing load cell transducer of claim 1 having adjustable sensitivity range and output frequency, wherein: the excitation voltage circuit (D) provides an excitation voltage for the sensor, which transmits a millivolt signal to the sensor input filter circuit (E).

3. The analog weighing load cell transducer of claim 1 having adjustable sensitivity range and output frequency, wherein: the output end of the SW2 dial switch (4) is electrically connected with the input end of the second-stage amplifying circuit (G).

4. The analog weighing load cell transducer of claim 1 having adjustable sensitivity range and output frequency, wherein: the millivolt signal of the sensor input filter circuit (E) is amplified through the sensor input filter circuit (E), the first-stage amplifying circuit (F) and the second-stage amplifying circuit (G) and then filtered through the output filter circuit (J) to output +/-10V voltage or converted into 0-20mA and 4-20mA currents through the voltage and current conversion circuit (I) to be output.

5. The analog weighing load cell transducer of claim 1 having adjustable sensitivity range and output frequency, wherein: the transmitter receives external 15-30V power supply and outputs +/-12V voltage to supply power for the internal circuit through the linear voltage stabilizing circuit (C) and the positive and negative voltage conversion circuit (B).

6. The analog weighing load cell transducer of claim 1 having adjustable sensitivity range and output frequency, wherein: the SW2 dial switch (4) selects the amplification factor through the dial switch.

7. The analog weighing load cell transducer of claim 1 having adjustable sensitivity range and output frequency, wherein: SW2-1, SW2-2, SW2-3 and SW2-4 in the SW2 dial switch (4) are used for selecting the amplification factor when the gain is calibrated, and SW2-5 is used for selecting the voltage regulation range of the zero point.

8. The analog weighing load cell transducer of claim 1 having adjustable sensitivity range and output frequency, wherein: SW1-1 and SW1-2 in the SW1 dial switch (3) are used for adjusting the output frequency of the transmitter, when the signal passes through the output filter circuit (J), the parameters in the filter circuit are adjusted through the dial switch, so that the low-frequency signal passes through, and the high-frequency signal does not pass through, thereby realizing the adjustment of the output signal frequency.