CN211783800U

CN211783800U - Automatic metering device

Info

Publication number: CN211783800U
Application number: CN201922493877.XU
Authority: CN
Inventors: 吕红贵; 陈军; 李明杰
Original assignee: Sichuan Hengzhun Testing Technology Co ltd
Current assignee: Sichuan Hengzhun Testing Technology Co ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-10-27
Anticipated expiration: 2029-12-31

Abstract

The utility model relates to the technical field of metering equipment, and aims to provide an automatic metering device, which comprises a weighing hopper, wherein a weighing device is arranged on the weighing hopper, a discharge hole of the weighing hopper is connected with a discharge pipe and a surplus material pipe, a first electric valve is arranged in the discharge pipe, a second electric valve is arranged in the surplus material pipe, and the weighing device is connected with a valve controller; the valve controller comprises a voltage comparison circuit, a first valve switch and a second valve switch, wherein the output end of the weighing device is connected with the input end of the voltage comparison circuit, the input end of the first valve switch and the input end of the second valve switch are connected, the first valve switch is connected between the first electric valve and an external power supply in series, and the second valve switch is connected between the second electric valve and the external power supply in series. The utility model has the advantages of improve the measurement degree of accuracy.

Description

Automatic metering device

Technical Field

The utility model relates to a technical field of measuring equipment, concretely relates to automatic measurement utensil.

Background

The weighing mode of the existing batching device is that various batching materials are weighed according to a set proportion, but the existing weighing device can not automatically discharge the materials with the weight exceeding the required weight when the materials are too much.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an automatic measuring device has the advantage that improves the measurement degree of accuracy.

In order to achieve the above object, the utility model adopts the following technical scheme: an automatic metering device comprises a weighing hopper, wherein a weighing device is arranged on the weighing hopper, a discharge pipe and a surplus material pipe are connected to a discharge port of the weighing hopper, a first electric valve is arranged in the discharge pipe, a second electric valve is arranged in the surplus material pipe, the weighing device is connected with a valve controller, the valve controller is used for controlling the first electric valve and the second electric valve to be closed in the weighing process, the valve controller is used for opening the second electric valve when the material in the weighing hopper is too heavy, and the valve controller is also used for opening the first electric valve to discharge the material after weighing is completed;

the valve controller comprises a voltage comparison circuit, a first valve switch and a second valve switch, the output end of the weighing device is connected with the input end of the voltage comparison circuit, the output end of the voltage comparison circuit is connected with the input end of the first valve switch and the input end of the second valve switch, the first valve switch is connected between the first electric valve and an external power supply in series, and the second valve switch is connected between the second electric valve and the external power supply in series.

Through the technical scheme, in the weighing process, an operator places materials into the meter, and the voltage comparison circuit of the valve controller controls the first electric valve and the second electric valve to be closed according to the weight information of the weighing hopper acquired by the weighing device. When the materials are excessive, the valve controller controls the first electric valve to be closed, the second valve switch controls the second electric valve to be opened, a part of the excessive materials are discharged until the weight of the materials in the weighing hopper is within a preset weight range, and then the second electric valve is closed. After the materials are weighed, the first electric valve is controlled to be opened by the first valve switch, the second electric valve is controlled to be closed by the second valve switch, the materials are discharged, and therefore the effect of improving the metering accuracy is achieved.

Preferably, the weighing device is a weighing sensor, and the output end of the weighing sensor is connected with the valve controller.

Through the technical scheme, the weighing sensor converts the weight information of the weighing hopper into the voltage information to be output.

Preferably, the first electric valve and the second electric valve are both normally closed solenoid valves.

Through the technical scheme, when the normally closed electromagnetic valve is electrified, the normally closed electromagnetic valve is in an open state; when the normally closed solenoid valve is powered off, the normally closed solenoid valve is in a closed state.

Preferably, the voltage comparison circuit includes a first voltage comparator U1 and a second voltage comparator U2, an output terminal of the weighing apparatus is connected to a non-inverting terminal of the first voltage comparator U1 and a non-inverting terminal of the second voltage comparator U2, a first reference voltage Vref1 is input to a non-inverting terminal of the first voltage comparator U1, an output terminal of the first voltage comparator U1 is connected to an input terminal of the first valve switch, a second reference voltage Vref2 is input to a non-inverting terminal of the second voltage comparator U2, an output terminal of the second voltage comparator U2 is connected to an input terminal of the second valve switch, and the second reference voltage Vref2 is greater than the first reference voltage Vref 1.

Through above-mentioned technical scheme, when weighing sensor detects the weighing hopper overweight, the voltage signal that weighing sensor output is greater than first reference voltage Vref1, and first voltage comparator U1 outputs high level to first valve switch. When the load cell detects that the weigh hopper is overweight, the voltage signal output by the load cell is greater than the second reference voltage Vref2, and the second voltage comparator U2 outputs a high level to the second valve switch.

Preferably, the second valve switch comprises a first NPN transistor Q1, the output terminal of the second voltage comparator U2 is connected to the base of the first NPN transistor Q1, the collector c of the first NPN transistor Q1 is connected to the external power source, and the second valve is connected in series between the collector c of the first NPN transistor Q1 and the external power source.

Through the technical scheme, the second voltage comparator U2 outputs a high level to the base electrode of the first NPN triode Q1, the first NPN triode Q1 is conducted, the second electromagnetic valve is electrified, and the second electric valve is opened. The second voltage comparator U2 outputs a low level to the base of the first NPN transistor Q1, the first NPN transistor Q1 is turned off, the second solenoid valve is de-energized, and the second solenoid valve is closed.

Preferably, the first valve switch includes a second NPN triode Q2 and a key switch S, the output end of the first voltage comparator U1 is connected to the base b of the second NPN triode Q2, the key switch S is connected in series between the second NPN triode Q2 and the output end of the voltage comparator U1, the collector C of the second NPN triode Q2 is connected to an external power supply, the first electric valve is connected in series between the collector C of the second NPN triode Q2 and the external power supply, a first resistor R1 and a second resistor R2 are further connected in series between the base b of the second NPN triode Q2 and the key switch S, the emitter e of the second NPN triode Q2 is further connected to the negative electrode of a first capacitor C1, and the positive electrode of the first capacitor C1 is connected to the connection node between the first resistor R1 and the second resistor R2.

Through the technical scheme, after weighing is completed, when the weight of the weighing hopper is larger than the lowest weight threshold value, the first voltage comparator U1 outputs a high level, when an operator closes the key switch S, a pulse signal is given to the base b of the second NPN triode Q2, the second NPN triode Q2 is conducted, the first resistor R1, the second resistor R2 and the first capacitor C1 form an RC delay circuit, the first electromagnetic valve is powered on for a period of time, the first electromagnetic valve is opened, and materials are discharged within the time. In the weighing process, when the weight of the weighing hopper is smaller than the lowest weight threshold value in the weighing process, the first voltage comparator U1 outputs a low level, and when an operator closes the key switch S, the second NPN triode Q2 is in a cut-off state, and the first electromagnetic valve is closed.

Preferably, the power supply device is used for supplying power to the weighing device, the first electric valve, the second electric valve and the valve controller, the power supply device comprises a rectifying unit, a filtering unit, a first voltage stabilizing unit and a second voltage stabilizing unit, the input end of the rectifying unit is connected with a power supply, the output end of the rectifying unit is electrically connected with the input end of the filtering unit, the output end of the filtering unit is respectively electrically connected with the input ends of the first voltage stabilizing unit and the second voltage stabilizing unit, and the output ends of the first voltage stabilizing unit and the second voltage stabilizing unit are used as the output end of the power supply device.

Through above-mentioned technical scheme, DC power supply passes through the rectifier unit, and the output keeps the former state, plays the self-adaptation effect, gets into voltage stabilizing unit after the filtering unit filtering high frequency clutter, is favorable to improving the holistic stability of power supply unit.

Preferably, still include the frame, the frame includes footstock and many slide rails, weighing device installs on the footstock, many the length direction of slide rail is parallel with vertical direction, weighing device's lateral wall is installed a plurality of respectively in many gliding gyro wheel of slide rail.

Through above-mentioned technical scheme, many slide rails carry on spacingly to weighing device, prevent weighing device slope.

To sum up, the beneficial effects of the utility model are that:

1. the utility model has the advantages of improving the metering accuracy;

2. the utility model discloses be provided with power supply unit, DC power supply keeps the former state through the rectification unit, and the output plays the self-adaptation effect, goes into the steady voltage unit after filtering unit filtering high frequency clutter, has the advantage that improves the holistic stability of power supply unit.

Drawings

FIG. 1 is a block diagram of the present invention;

fig. 2 is a schematic circuit diagram for showing a power supply device according to the present invention;

fig. 3 is a schematic circuit diagram for showing a voltage comparison circuit according to the present invention;

FIG. 4 is a schematic circuit diagram illustrating a second valve switch according to the present invention;

fig. 5 is a schematic circuit diagram for showing the first valve switch of the present invention;

fig. 6 is a schematic structural view of embodiment 2 of the present invention.

In the figure, 1, weighing hopper; 2. a discharge pipe; 3. a residual material pipe; 4. a frame; 41. a top seat; 42. A slide rail; 5. and a weighing device.

Detailed Description

The technical solution in the embodiments of the present invention is clearly and completely described below with reference to fig. 1 to 6 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.

Example 1

Referring to fig. 1, an automatic weighing apparatus includes a weighing hopper 1, and a weighing device 5 is disposed on the weighing hopper 1, and it should be noted that, in this embodiment, the weighing device 5 is a weighing sensor, specifically, an S-shaped weighing sensor. The discharge gate of weighing hopper 1 is connected with discharging pipe 2 and clout pipe 3, is provided with first electric valve in the discharging pipe 2, is provided with the second electric valve in the clout pipe 3, and it is worth explaining, first electric valve and second electric valve are the normal close type solenoid valve. When the normally closed electromagnetic valve is electrified, the normally closed electromagnetic valve is in an open state; when the normally closed solenoid valve is powered off, the normally closed solenoid valve is in a closed state.

Referring to fig. 1 and 2, the device further comprises a power supply device, the power supply device is used for supplying power to the weighing device 5, the first electric valve, the second electric valve and the valve controller, the power supply device comprises a rectifying unit, a filtering unit, a first voltage stabilizing unit and a second voltage stabilizing unit, the input end of the rectifying unit is connected with a power supply, the output end of the rectifying unit is electrically connected with the input end of the filtering unit, the output end of the filtering unit is electrically connected with the input ends of the first voltage stabilizing unit and the second voltage stabilizing unit respectively, and the output ends of the first voltage stabilizing unit and the second voltage stabilizing unit are used as the output end of the power supply device.

Specifically, referring to fig. 2, the first voltage stabilization unit includes a first voltage stabilization chip with a model number LM317T, and the second voltage stabilization unit includes a second voltage stabilization chip with a model number LM 317T; the IN pin of the first voltage stabilizing chip and the IN pin of the second voltage stabilizing chip are respectively connected with two output ends of the filtering unit; the ADJ pin of the first voltage stabilizing chip is connected with the OUT pin of the first voltage stabilizing chip through a sixteenth resistor R16; the ADJ pin of the second voltage stabilizing chip is connected with the OUT pin of the second voltage stabilizing chip through a fifteenth resistor R15; an ADJ pin of the first voltage stabilizing chip is connected with one end of a thirteenth resistor R13, the other end of the thirteenth resistor R13 is connected with one end of a fourteenth resistor R14, and the other end of the fourteenth resistor R14 is connected with an ADJ pin of the second voltage stabilizing chip; the OUT pin of the first voltage stabilizing chip is connected with the OUT pin of the second voltage stabilizing chip; the IN pin of the first voltage stabilizing chip is connected with the junction of the thirteenth resistor R13 and the fourteenth resistor R14 through the eleventh resistor, and the IN pin of the second voltage stabilizing chip is connected with the junction of the thirteenth resistor R13 and the fourteenth resistor R14 through the twelfth resistor.

The rectifying unit is a bridge rectifier circuit. The direct current power supply passes through the bridge rectifier circuit, the output keeps the original shape, the self-adaption function is achieved, the circuit structure is simple, and the practicability is high. The filtering unit comprises an eleventh capacitor C11 and a twelfth capacitor C12; one end of an eleventh capacitor C11 is connected with an IN pin of the first voltage stabilization chip, and the other end of the eleventh capacitor C11 is connected with the connection part of a thirteenth resistor R13 and a fourteenth resistor R14; one end of a twelfth capacitor C12 is connected to the junction of the thirteenth resistor R13 and the fourteenth resistor R14, and the other end of the twelfth capacitor C12 is connected to the IN pin of the second regulator chip. High-frequency clutter is effectively filtered through the filtering unit, and the overall stability of the power supply unit is improved.

In a specific implementation, as shown in fig. 2, the bridge rectifier circuit includes a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4; the cathode of the first diode D1 is connected with the cathode of the second diode D2, the anode of the second diode D2 is connected with the cathode of the third diode D3, the anode of the third diode D3 is connected with the anode of the fourth diode D4, and the cathode of the fourth diode D4 is connected with the anode of the first diode D1; the anode of the first diode D1 and the anode of the second diode D2 are connected with the power supply, the cathode of the first diode D1 is connected with the IN pin of the first voltage stabilization chip, the anode of the third diode D3 is connected with the IN pin of the second voltage stabilization chip, the voltage stabilization chip uses LM317T, the voltage regulation range is wide, the voltage stabilization is good, only the resistance values of a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15 and a sixteenth resistor R16 need to be regulated, the output voltage can be changed, wherein the models and the resistance values or the capacities of two mutually symmetrical components are consistent, and the regulation formula is about: vout1 is 1.25V x (1+ R13/R16). The first voltage stabilizing chip and the second voltage stabilizing chip are symmetrically arranged.

Referring to fig. 1, the weighing device 5 is connected to a valve controller, the valve controller is used for controlling the first electric valve and the second electric valve to be closed in the weighing process, the valve controller is used for opening the second electric valve when the material in the weighing hopper 1 is too heavy, and the valve controller is also used for opening the first electric valve to discharge the material after the weighing is completed. The valve controller comprises a voltage comparison circuit, a first valve switch and a second valve switch, wherein the output end of the weighing device 5 is connected with the input end of the voltage comparison circuit, the input end of the first valve switch and the input end of the second valve switch are connected, the first valve switch is connected between the first electric valve and an external power supply in series, and the second valve switch is connected between the second electric valve and the external power supply in series.

Referring to fig. 3, the voltage comparison circuit includes a first voltage comparator U1 and a second voltage comparator U2, an output terminal of the weighing apparatus 5 is connected to a non-inverting terminal of the first voltage comparator U1 and a non-inverting terminal of the second voltage comparator U2, a first reference voltage Vref1 is input to an inverting terminal of the first voltage comparator U1, an output terminal of the first voltage comparator U1 is connected to an input terminal of the first valve switch, a second reference voltage Vref2 is input to an inverting terminal of the second voltage comparator U2, an output terminal of the second voltage comparator U2 is connected to an input terminal of the second valve switch, and the second reference voltage Vref2 is greater than the first reference voltage Vref 1.

Specifically, when the load cell detects that the weigh hopper 1 is over-weighted, the voltage signal output by the load cell is greater than the first reference voltage Vref1, and the first voltage comparator U1 outputs a high level to the first valve switch. When the load cell detects that the weigh hopper 1 is over-weighted, the voltage signal output from the load cell is greater than the second reference voltage Vref2, and the second voltage comparator U2 outputs a high level to the second valve switch.

Referring to fig. 4, the second valve switch includes a first NPN transistor Q1, an output terminal of the second voltage comparator U2 is connected to a base of the first NPN transistor Q1, a collector c of the first NPN transistor Q1 is connected to an external power source, and the second valve is connected in series between the collector c of the first NPN transistor Q1 and the external power source.

Specifically, the second voltage comparator U2 outputs a high level to the base of the first NPN transistor Q1, the first NPN transistor Q1 is turned on, the second solenoid valve is energized, and the second electric valve is opened. The second voltage comparator U2 outputs a low level to the base of the first NPN transistor Q1, the first NPN transistor Q1 is turned off, the second solenoid valve is de-energized, and the second solenoid valve is closed.

Referring to fig. 5, the first valve switch includes a second NPN transistor Q2 and a key switch S, an output terminal of the first voltage comparator U1 is connected to a base b of the second NPN transistor Q2, the key switch S is connected in series between the second NPN transistor Q2 and an output terminal of the voltage comparator U1, a collector C of the second NPN transistor Q2 is connected to an external power source, the first electric valve is connected in series between a collector C of the second NPN transistor Q2 and the external power source, a first NPN resistor R1 and a second NPN resistor R2 are further connected in series between the base b of the second NPN transistor Q2 and the key switch S, an emitter e of the second NPN transistor Q2 is further connected to a negative electrode of a first capacitor C1, and a positive electrode of the first capacitor C1 is connected to a connection node of the first resistor R1 and the second resistor R2.

Specifically, after weighing is completed, when the weight of the weighing hopper is larger than the lowest weight threshold value, the first voltage comparator U1 outputs a high level, when an operator closes the key switch S, a pulse signal is given to the base b of the second NPN triode Q2, so that the second NPN triode Q2 is turned on, and the first resistor R1, the second resistor R2 and the first capacitor C1 form an RC delay circuit, so that the first electromagnetic valve is kept energized for a period of time, the first electromagnetic valve is opened, and the material is discharged within the time. In the weighing process, when the weight of the weighing hopper is smaller than the lowest weight threshold value in the weighing process, the first voltage comparator U1 outputs a low level, and when an operator closes the key switch S, the second NPN triode Q2 is in a cut-off state, and the first electromagnetic valve is closed.

The implementation principle is as follows: in the weighing process, an operator places materials into the meter, and a voltage comparison circuit of the valve controller controls the first electric valve and the second electric valve to be closed according to the weight information of the weighing hopper 1 acquired by the weighing device 5. When the material is excessive, the valve controller controls the first electric valve to close, the second valve switch controls the second electric valve to open, a part of the excessive material is discharged until the weight of the material in the weighing hopper 1 is within the preset weight range, and then the second electric valve is closed. After the materials are weighed, the first valve switch controls the first electric valve to be opened, and the second valve switch controls the second electric valve to be closed, so that the materials are discharged.

Example 2

Referring to fig. 1 and 6, an automatic weighing apparatus includes a weighing hopper 1, and a weighing device 5 is disposed on the weighing hopper 1, and it should be noted that, in this embodiment, the weighing device 5 is a weighing sensor, specifically, an S-shaped weighing sensor. The discharge gate of weighing hopper 1 is connected with discharging pipe 2 and clout pipe 3, is provided with first electric valve in the discharging pipe 2, is provided with the second electric valve in the clout pipe 3, and it is worth explaining, first electric valve and second electric valve are the normal close type solenoid valve. When the normally closed electromagnetic valve is electrified, the normally closed electromagnetic valve is in an open state; when the normally closed solenoid valve is powered off, the normally closed solenoid valve is in a closed state.

Referring to fig. 6, the weighing apparatus further includes a frame 4, the frame 4 includes a top seat 41 and four slide rails 42, the weighing apparatus 5 is installed on the top seat 41, the four slide rails 42 are arranged around the weighing hopper 1, the length directions of the four slide rails 42 are parallel to the vertical direction, and rollers sliding in the four slide rails 42 are installed on the side walls of the weighing apparatus respectively.

Referring to fig. 2, the device further comprises a power supply device, the power supply device is used for supplying power to the weighing device 5, the first electric valve, the second electric valve and the valve controller, the power supply device comprises a rectifying unit, a filtering unit, a first voltage stabilizing unit and a second voltage stabilizing unit, the input end of the rectifying unit is connected with a power supply, the output end of the rectifying unit is electrically connected with the input end of the filtering unit, the output end of the filtering unit is electrically connected with the input ends of the first voltage stabilizing unit and the second voltage stabilizing unit respectively, and the output ends of the first voltage stabilizing unit and the second voltage stabilizing unit serve as the output end of the power supply device.

The implementation principle of the implementation is as follows: in the weighing process, an operator places materials into the meter, and a voltage comparison circuit of the valve controller controls the first electric valve and the second electric valve to be closed according to the weight information of the weighing hopper 1 acquired by the weighing device 5. When the material is excessive, the valve controller controls the first electric valve to close, the second valve switch controls the second electric valve to open, a part of the excessive material is discharged until the weight of the material in the weighing hopper 1 is within the preset weight range, and then the second electric valve is closed. After the materials are weighed, the first valve switch controls the first electric valve to be opened, and the second valve switch controls the second electric valve to be closed, so that the materials are discharged.

In the description of the present invention, it should be understood that the terms "counterclockwise", "clockwise", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description of the present invention, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Claims

1. An automatic metering device is characterized by comprising a weighing hopper (1), wherein a weighing device (5) is arranged on the weighing hopper (1), a discharge pipe (2) and a residual material pipe (3) are connected to a discharge port of the weighing hopper (1), a first electric valve is arranged in the discharge pipe (2), a second electric valve is arranged in the residual material pipe (3), the weighing device (5) is connected with a valve controller, the valve controller is used for controlling the first electric valve and the second electric valve to be closed in the weighing process, the valve controller is used for opening the second electric valve when the materials in the weighing hopper (1) are overweight, and the valve controller is also used for opening the first electric valve to discharge the materials after weighing is completed;

the valve controller comprises a voltage comparison circuit, a first valve switch and a second valve switch, the output end of the weighing device (5) is connected with the input end of the voltage comparison circuit, the output end of the voltage comparison circuit is connected with the input end of the first valve switch and the input end of the second valve switch, the first valve switch is connected between the first electric valve and an external power supply in series, and the second valve switch is connected between the second electric valve and the external power supply in series.

2. An automatic metering device according to claim 1, characterized in that the weighing means (5) is a load cell, the output of which is connected to a valve controller.

3. An automatic metering device as claimed in claim 1 wherein said first and second electrovalves are normally closed solenoid valves.

4. An automatic metering device as claimed in any one of claims 1 to 3, characterized in that the voltage comparison circuit comprises a first voltage comparator U1 and a second voltage comparator U2, the output of the weighing apparatus (5) being connected to the non-inverting terminal of the first voltage comparator U1 and to the non-inverting terminal of the second voltage comparator U2, the inverting terminal of the first voltage comparator U1 being supplied with a first reference voltage Vref1, the output of the first voltage comparator U1 being connected to the input of a first valve switch, the inverting terminal of the second voltage comparator U2 being supplied with a second reference voltage Vref2, the output of the second voltage comparator U2 being connected to the input of a second valve switch, the second reference voltage Vref2 being greater than the first reference voltage Vref 1.

5. The automatic metering device of claim 4 wherein the second valve switch comprises a first NPN transistor Q1, the output of the second voltage comparator U2 is connected to the base b of a first NPN transistor Q1, the collector c of the first NPN transistor Q1 is connected to an external power source, and the second valve is connected in series between the collector c of the first NPN transistor Q1 and the external power source.

6. The automatic metering device of claim 4 wherein the first valve switch comprises a second NPN transistor Q2 and a push-button switch S, the output end of the first voltage comparator U1 is connected with the base electrode b of the second NPN triode Q2, the keyswitch S is connected in series between the second NPN transistor Q2 and the output of the voltage comparator U1, the collector c of the second NPN triode Q2 is connected to an external power source, the first electric valve is connected in series between the collector c of the second NPN triode Q2 and the external power source, a first resistor R1 and a second resistor R2 are also connected in series between the base b of the second NPN triode Q2 and the key switch S, the emitter e of the second NPN triode Q2 is further connected to the negative electrode of the first capacitor C1, the anode of the first capacitor C1 is connected to the connection node of the first resistor R1 and the second resistor R2.

7. The automatic metering device of claim 4, further comprising a power supply device, wherein the power supply device is used for supplying power to the weighing device (5), the first electric valve, the second electric valve and the valve controller, the power supply device comprises a rectifying unit, a filtering unit, a first voltage stabilizing unit and a second voltage stabilizing unit, an input end of the rectifying unit is connected with a power supply, an output end of the rectifying unit is electrically connected with an input end of the filtering unit, an output end of the filtering unit is electrically connected with input ends of the first voltage stabilizing unit and the second voltage stabilizing unit respectively, and output ends of the first voltage stabilizing unit and the second voltage stabilizing unit serve as output ends of the power supply device.

8. An automatic measuring device according to any one of claims 5-7, characterized by further comprising a frame (4), wherein the frame (4) comprises a top seat (41) and a plurality of sliding rails (42), the weighing device (5) is mounted on the top seat (41), the length direction of the plurality of sliding rails (42) is parallel to the vertical direction, and a plurality of rollers respectively sliding in the plurality of sliding rails (42) are mounted on the side wall of the weighing device (5).