CN217100546U

CN217100546U - Miniature automatic weighing device for on-line detection

Info

Publication number: CN217100546U
Application number: CN202123093352.0U
Authority: CN
Inventors: 张奎; 栗潮; 金永报
Original assignee: China Power Construction Henan Wanshan Green Building Materials Co Ltd
Current assignee: China Power Construction Henan Wanshan Green Building Materials Co Ltd
Priority date: 2021-12-10
Filing date: 2021-12-10
Publication date: 2022-08-02
Anticipated expiration: 2031-12-10

Abstract

The utility model relates to a weighing-appliance field, especially a miniature automatic weighing device is used in on-line measuring. The weighing device aims to solve the problems that in the prior art, the weighing device for distributing and packaging granular products is narrow in application range and cannot be used for analyzing and weighing test results. The utility model discloses a structural framework and outer connecting device, testpieces collection device and upset bottom plate, weighing device, testpieces unloading device and control system to realize the closed loop and connect the material, automatic weighing, each process steps of automatic evacuation material. Has the advantages that: the function is various, safe and reliable, simple and practical, and degree of automation is high, can realize automatically that connect the material, title material and unload.

Description

Miniature automatic weighing device for on-line detection

Technical Field

The utility model relates to a weighing-appliance field, especially a miniature automatic weighing device is used in on-line measuring.

Background

In the production process of products, the quality of the products or semi-finished products on a production line needs to be sampled and detected, the detection frequency meets the requirement of a certain rule, and the detection is carried out repeatedly at intervals. The measurement precision can meet the corresponding requirements of national or industrial standards, and the test sample does not leak in the detection process.

On-line testing requires a weighing device that can be mated to an automated testing device that automatically weighs one or more test isolates or residues (hereinafter referred to as test materials) under the control of the testing device, and is repeated at test cycle intervals.

In the existing automatic production process, the automatic weighing device is mainly used for the aspects of material distribution and packaging of granular products, production, material distribution and metering and the like.

The automatic material distributing and weighing device is mainly used for dividing powder or granular materials on a production line according to certain mass and then facilitating packaging, and the mass of each packaging unit is equal. The main components of the weighing device are a pressure sensor and a controller, the pressure sensor is arranged below the discharging belt conveyor, the incoming belt conveyor directly conveys materials to the discharging belt conveyor, the pressure sensor outputs a pressure electric signal, and the controller converts the electric signal into quality. When the mass reaches a set value, the weighing device sends a signal to suspend the operation of the incoming material belt conveyor, and after a certain time (reserved time for completing subsequent processes), the weighing device sends a signal to start the incoming material belt conveyor again, and the process is carried out periodically.

The production ingredient automatic metering is used for measuring raw materials for commodity production, and two measuring modes are adopted, wherein one mode is that a pressure or tension sensor is arranged on a material containing body, and a control system controls the on-off of a feeding belt conveyor according to a sensor signal; the other is that a sensor is arranged below the feeding belt, the sensor senses the flow of the material, and the control system calculates the feeding according to the flow to control the on-off of the feeding belt conveyor.

The applicant believes that the existing automatic weighing device is mainly used for distributing and packaging granular products, producing, distributing and metering the granular products and the like, has large volume, does not have good sealing, has constant mass during weighing every time and the same weighing period, and cannot be used for analyzing and weighing test results.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving among the prior art weighing equipment of the branch material of granular product and packing, can not be used for the analysis weighing problem of test result, the device is to the miniature automatic weighing device for the on-line measuring of above demand research and development, can satisfy above-mentioned automatic production in-process likepowder or granular product assay weigh and quality testing's requirement.

The utility model has the following concrete scheme:

the miniature automatic weighing device for online detection comprises a structural frame and an external connecting device, a sample collecting device and a turnover bottom plate thereof, a weighing device, a sample emptying device and a control system, wherein the structural frame and the external connecting device comprise an outer frame, an annular connecting steel plate, a sealing rubber plate, a supporting beam and an electromagnet; the sample collecting device comprises a material collecting box, a balancing weight and a movably mounted turnover bottom plate, wherein the movably mounted turnover bottom plate is arranged below the material collecting box, a limiting original piece is arranged between the movably mounted turnover bottom plate and the material collecting box, and the balancing weight is arranged in the material collecting box, so that the resultant force direction of a gravity vector is positioned in front of the gravity center moving direction of the material collecting box in the discharging process; the sample emptying device comprises a material emptying push-pull rod, the material emptying push-pull rod is connected with a discharging micro motor, the discharging micro motor is installed on the supporting beam, the material emptying push-pull rod is Y-shaped, the V end of the material emptying push-pull rod is hung on two sides of the sample collecting device to drive the sample collecting device to horizontally move, and the material emptying push-pull rod guides the turnover plate to turn over and discharge materials by taking the positioning block as a fulcrum. Weighing device include via at least 3 miniature tension sensor hoist in the outer frame in the weighing layer board, be equipped with weighing unit on the weighing layer board, weighing unit including weigh layer board bearing support strip with weigh the arc recess that the upper surface of layer board bearing support strip was equipped with, weighing device with in the space between the frame, form the work space that collection magazine was collected, was adjusted, was emptied, was weighed, upset bottom plate semi-cylindrical support bar with the arc recess morpheme corresponds.

In specific implementation, the limiting element comprises a vertical positioning pin for connection, namely the vertical positioning pin is arranged on the turnover bottom plate, and the corresponding vertical positioning pin penetrates through a corresponding round hole in the bottom plate extending outwards from the material collecting box.

In specific implementation, two sides of the turnover bottom plate are respectively provided with an outward extending guide rod, the lower surface of the turnover bottom plate is provided with two semicircular supporting columns in the same direction as the outward extending guide rods, an inverted trapezoidal plate is arranged below each supporting column, the inverted trapezoidal plate and the semicircular supporting columns are of an integral structure and are fixed on the lower surface of the turnover bottom plate, the outward extending guide rods are arranged in hanging rings arranged at V ends of the discharging push-pull rods, and the inner area of the hanging rings is larger than the outer contour area of the outward extending guide rods.

In a specific implementation, the weighing pallet has an area for accommodating at least 2 sample collection devices and a corresponding number of weighing cells to independently measure the weight of each sample collection device.

In specific implementation, the input end of the control system is connected with the micro tension sensor, and the output end of the control system is connected with the discharging micro motor and the display screen.

The beneficial effects of the utility model reside in that: the power uses a 12V low-voltage direct-current power supply, and the safety and the reliability are realized; the electromagnetic force is used for pushing the material collecting box to be butted with and separated from the discharge port of the online detection instrument, and the device is simple and practical. The discharge port of the online detection instrument is welded with the annular connecting steel plate, the lower surface of the annular connecting steel plate is adhered with a sealing rubber plate, and the feeding and discharging opening of the aggregate box is tightly pressed on the sealing rubber plate under the action of electromagnetic force, so that the sealing is complete and reliable;

the overturning bottom plate with the vertical positioning pin can ensure that the material collecting box is accurately butted with the online detection device and is not separated in the process of overturning and emptying the test material; the shape of the end of the discharging turnover guide rail limits the maximum turnover angle of the turnover bottom plate of the aggregate box, and the weighing system is not influenced by the turnover impact force. The surface of the discharging overturning guide rail is slightly higher than the surface of the weighing supporting plate bearing supporting strip, and the bottom of the V-shaped groove of the discharging overturning guide rail is slightly lower than the arc-shaped groove of the weighing supporting plate bearing supporting strip, so that the weight of the aggregate box, the overturning bottom plate and the balance weight of the aggregate box can be ensured to be completely acted on the weighing supporting plate during weighing, and the aggregate box is separated from the weighing supporting plate in the overturning process; the end hanging ring of the push-pull rod is clamped on the guide rod extending out of the turnover bottom plate, and the turnover bottom plate is pushed and pulled under the action of the discharge micro motor. When the suspension loop returns to the initial state, the outward extending guide rod of the turnover bottom plate slides to the arc-shaped groove of the bearing support strip of the weighing support plate along the V-shaped groove of the turnover guide rail and is static, and the outward extending guide rod just falls at the middle position of the lower part of the suspension loop and is separated from the suspension loop. When the hanging ring moves to the farthest end, the weight of the overturning device is completely supported on the hanging ring, and the final overturning is completed; the balancing weight of the material collecting box improves the center of the material collecting box, plays a key role in overturning the overturning device, and plays a role in balancing the weighing system.

Drawings

FIG. 1 is a front view of a sample weighing unit according to the present invention;

FIG. 2 is a left side view of the sample weighing unit structure of the present invention;

FIG. 3 is a plan view of the sample weighing unit structure of the present invention;

FIG. 4 is a front view of the frame and outer connecting means of the present construction;

FIG. 5 is a top view of the frame and outer connecting means of the present construction;

FIG. 6 is a left side view of the frame and outer connecting means structure of the present structure;

FIG. 7 is a front view of the sample collection device and its inverted base plate;

FIG. 8 is a plan view of a sample collection device and its inverted base plate;

FIG. 9 is a left side view of the sample collection device and its inverted base plate;

FIG. 10 is a front view of the sample emptying device;

FIG. 11 is a plan view of the sample emptying device;

FIG. 12 is a front view of the weighing apparatus;

FIG. 13 is a top view of the weighing apparatus;

names of components in the drawings:

1. an annular connecting steel plate; 2. sealing the rubber plate; 3. an outer frame; 4. a supporting beam; 5. connecting the steel plate openings; 6. an electromagnet; 7. a balancing weight; 8. a material collecting box; 9. a blanking port; 10. an overhanging base plate; 11. turning over the bottom plate; 12. a vertical positioning pin; 13. an overhanging guide bar; 14. a semi-cylindrical support bar; 15. an inverted trapezoidal plate; 16. steel plates extend outwards from two sides of the upper part of the aggregate box; 17. a push-pull device guide rail; 18. a discharge micro motor; 19. a material-discharging push-pull rod; 20, hanging a ring; 21. discharging and turning over the guide rail; 22. a guide rail V-shaped groove; 23, horizontally limiting the guide rail; 24. weighing a supporting plate; 25. a miniature tension sensor; 26. weighing a supporting plate bearing supporting strip; 27. an arc-shaped groove.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.

Example 1

A miniature automatic weighing device for online detection is disclosed, see fig. 1 to 13, and comprises a structural frame and an external connecting device, a sample collecting device and a turning bottom plate 11 thereof, a weighing device, a sample emptying device and a control system, wherein the structural frame and the external connecting device comprise an outer frame 3, an annular connecting steel plate 1, a sealing rubber plate 2, a supporting beam 4 and an electromagnet 6, the upper surface of the outer frame 3 is provided with a blanking port 9, the left side surface of the outer frame 3 is provided with a discharge port, the annular connecting steel plate 1 is arranged above the blanking port 9, the sealing rubber plate 2 is arranged below the blanking port 9, the electromagnet 6 is arranged below the sealing rubber plate 2, and the supporting beam 4 is transversely arranged in the discharge port; the sample collecting device comprises a material collecting box 8, a balancing weight 7 and a movably mounted turnover bottom plate 11, wherein the movably mounted turnover bottom plate 11 is arranged below the material collecting box 8, a limiting original piece is arranged between the movably mounted turnover bottom plate and the material collecting box 8, and the balancing weight 7 is arranged in the material collecting box 8, so that the resultant force direction of gravity vectors is in front of the gravity center moving direction in the material collecting box 8 discharging process in the discharging process; the sample emptying device comprises a material discharging push-pull rod 19, the material discharging push-pull rod 19 is connected with a discharging micro motor 18, the discharging micro motor 18 is arranged on the supporting beam 4, the material discharging push-pull rod 19 is Y-shaped, the V end of the material discharging push-pull rod is hung on two sides of the sample collecting device to drive the sample collecting device to horizontally move, and the material discharging device guides the overturning plate to overturn by taking the positioning block as a fulcrum. The weighing device comprises a weighing supporting plate 24 which is hung in the outer frame 3 through at least 3 micro tension sensors 25, a weighing unit is arranged on the weighing supporting plate 24 and comprises a weighing supporting plate bearing supporting strip 26 and an arc-shaped groove 27 which is formed in the upper surface of the weighing supporting plate bearing supporting strip 26, a working space for collecting, adjusting, emptying and weighing the material collecting box 8 is formed in the space between the weighing device and the outer frame 3, and the semi-cylindrical supporting strips 14 of the turnover bottom plate 11 correspond to the shape and position of the arc-shaped groove 27.

In the working process, especially in the structural frame and the external connecting device, the annular connecting steel plates 1 are lapped on two sides of the external frame 3, two ends of the annular connecting steel plates are welded or bolted with the external frame, and the middle of the annular connecting steel plates is provided with a square connecting steel plate opening 5. The periphery of the opening of the lower surface connecting steel plate of the annular connecting steel plate is adhered with a sealing rubber plate 2, and the left middle position and the right middle position of the upper surface are respectively fixed with a micro electromagnet 6. When the electromagnet is electrified, the aggregate box 8 moves upwards under the action of electromagnetic force, and the blanking port 9 is closely attached to the annular connecting steel plate through the sealing rubber plate to achieve the sealing effect; after the electromagnet is powered off, the magnetic force disappears, and the material collecting box falls back to the initial position. The length and the width of the external material collecting port are both smaller than the opening 5 of the annular connecting steel plate, and the external material collecting port and the annular connecting steel plate are in butt seal welding. The supporting beam 4 is used for fixing the discharging micro motor.

The sample collecting device and the turnover bottom plate part thereof, the upper part of the collecting box 8 is a full-section open type blanking port 9, two sides are provided with overhanging steel plates 16, and the lower part is provided with an overhanging bottom plate 10. The material collecting box enters and exits the blanking port 9 to be used for collecting a test material and an emptying test material, the steel plates 16 extending outwards on two sides of the opening are used for installing balancing weights to be welded or screwed, and the balancing weights 7 are fixed at the front end and the rear end of the steel plates extending outwards. The lower part of the material collecting box extends outwards and the middle position of the front part and the rear part of the bottom plate 10 is respectively provided with a round hole.

The front and the back of the upper surface of the turnover bottom plate 11 are respectively provided with a vertical positioning pin 12 which is aligned with a round hole of an extended bottom plate at the lower part of the aggregate box. Two sides of the turnover bottom plate are respectively provided with an outward extending guide rod 13, the lower surface of the turnover bottom plate is provided with two semi-cylindrical supporting bars 14 which are consistent with the directions of the outward extending guide rods, and an inverted trapezoidal plate 15 is arranged below the supporting bars. The inverted trapezoidal plate and the semicircular supporting columns are of an integral structure and are fixed on the lower surface of the turnover bottom plate.

The turnover bottom plate 11 is connected with the overhanging bottom plate 10 through a vertical positioning pin 12 on the turnover bottom plate. The vertical positioning pin 12 passes through the corresponding round hole on the overhanging bottom plate 10, and the aggregate box together with the overhanging bottom plate can freely move in the vertical direction along the vertical positioning pin. The top end of the vertical positioning pin is provided with a limiting device, so that the material collecting box can be prevented from being separated from the turnover bottom plate in the vertical movement and turnover process of the material collecting box.

The electromagnet 6 generates magnetic force after being electrified, and the material collecting box 8 moves upwards along the vertical positioning pin 12 and presses the sealing rubber plate 2 on the lower surface of the annular connecting steel plate 1, so that the sealing purpose is achieved. After the electromagnet is powered off, the magnetic force disappears, and the material collecting box falls back to the initial position.

The outward extending guide rod 13 of the turnover bottom plate of the aggregate box is a stressed device for pushing the sample collection device to translate along the turnover rail 21. The inverted base plate lower surface semi-cylindrical support posts 14 are point contact means with the weigh pallet load bar 26. The balancing weight 7 can balance the sample collection and improve the gravity center of the sample collection device so as to ensure that the material collection box can be turned to a certain angle.

In the sample emptying device, one end of a emptying push-pull rod 19 is provided with a hanging ring 20, the other end of the emptying push-pull rod is connected with a discharging micro motor 18, and a guide rod 13 extending outwards from a turnover bottom plate of the collecting box is clamped in the hanging ring.

Two sides of the guide rail 17 are respectively provided with a push-pull device close to the outer frame, and two ends of the guide rail are welded on the outer frame. Two sides of the central line of each guide rail are respectively provided with a guide rail horizontal limiting column 23 which limits the horizontal moving range of the end annular clamp 20 of the discharging push-pull rod.

The widened part of the middle inner side of the push-pull device guide rail 17 is welded with a discharging turnover guide rail 21. Two ends of the discharging and discharging overturning guide rail 21 are respectively provided with a V-shaped groove 22 which is used for guiding the overturning bottom plate of the material collector to smoothly fall on the designated position of the weighing supporting plate and separate from the discharging and overturning guide rail.

In the initial state of the non-working state, the center of the hanging ring 20 of the discharging push-pull rod, the V-shaped groove 22 of the discharging guide rail and the arc-shaped groove 27 on the weighing supporting strip 26 are aligned up and down, the bottom of the arc-shaped groove 27 is slightly higher than the bottom of the V-shaped groove 22, and the upper surface of the discharging overturning guide rail 21 is slightly higher than the weighing supporting strip 21 of the weighing supporting plate. The semi-cylindrical support bars 14 of the reverse bottom plate of the material collector are supported in the arc-shaped grooves 27 of the support bars of the weighing support plate, and the outward extending guide rods 13 of the reverse bottom plate are clamped at the middle lower part of the hanging ring 20 and are in a non-contact state. At the moment, the weighing device is separated from the discharging device, and the mass sum of the counterweight contained in the material collecting box and the overturning bottom plate thereof can be read.

When the sample is emptied, the emptying push-pull rod 19 horizontally moves rightwards along the emptying turnover guide rail 21 under the action of the emptying micromotor 18, and the outward extending guide rod 13 in the hanging ring synchronously moves. When the gravity center of the material collecting box and the overturning bottom plate moves to the right side boundary, overturning is started; when meeting the guide rail horizontal limiting column 23, the right movement is stopped. The collecting box and the overturning bottom plate thereof are overturned to the maximum position of not less than 135 degrees under the combined action of the self weight of the device and the counterweight block 7 of the collecting box, and the sample is emptied. The maximum tilting angle is limited by the tilting guide 21 to prevent the weighing device from being impacted.

After the sample is discharged, the discharge micro motor 18 is reversed, the aggregate box 8 and the turnover bottom plate 11 thereof are restored to the state before turnover, and then the discharge micro motor 18 is moved to the initial position to stop working. At this point, the semi-cylindrical support bars 14 on the lower surface of the inverted bottom plate slide into the V-shaped grooves 22 of the inverted guide rails and finally fall into the arc-shaped grooves 27 at the two ends of the weighing pallet support 26, the mass of the aggregate box 8, the inverted bottom plate 11 and the counterweight are applied to the weighing pallet, and the device returns to the original state.

Each weighing unit on the weighing support plate is provided with a weighing support plate bearing support strip 26 along two sides of the discharging direction, and two ends of the weighing support plate bearing support strip 26 are respectively provided with an arc-shaped groove 27. During weighing, the semi-cylindrical support bars 14 of the turnover bottom plate of the collecting box fall in the support arc-shaped grooves 27 of the weighing support plate, the outward extending push-pull stop rods 13 of the turnover bottom plate of the collecting box are suspended right above the V-shaped grooves 22 of the discharging guide rails and at the middle lower part of the hanging rings 20 at the end parts of the discharging push-pull rods and are in a suspended state, and the mass of the collecting box of the sample collecting device and the mass of the reverse bottom plate of the collecting box of the sample collecting device are all acted on the weighing support plate 24.

When a plurality of weighing units are arranged, the background control program controls the weighing units to discharge materials in sequence, and simultaneously reads the mass of the sample collecting device before and after discharging, so that automatic weighing item by item is realized.

The limiting element comprises a turnover bottom plate 11 and a vertical positioning pin 12 arranged between the outer extending bottom plate 10 of the material collecting box 8, namely the vertical positioning pin 12 is arranged on the turnover bottom plate 11, and the corresponding vertical positioning pin 12 penetrates through a corresponding round hole in the outer extending bottom plate 10 of the material collecting box 8.

Two sides of the overturning bottom plate 11 are respectively provided with an outward extending guide rod 13, the lower surface of the overturning bottom plate is provided with two semicircular supporting columns in the same direction as the outward extending guide rods 13, an inverted trapezoidal plate 15 is arranged below each supporting column, the inverted trapezoidal plate 15 and the semicircular supporting columns are of an integral structure and are fixed on the lower surface of the overturning bottom plate 11, the outward extending guide rods 13 are positioned in hanging rings 20 arranged at V ends of a discharging push-pull rod 19, and the inner area of the hanging rings 20 is larger than the outer contour area of the outward extending guide rods 13.

The weighing pallet has an area to accommodate at least 2 sample collection devices and a corresponding number of weighing cells to independently measure the weight of each sample collection device.

The input end of the control system is connected with the micro tension sensor 25, and the output end is connected with the discharging micro motor and the display screen.

The device is a cuboid, can be composed of one or more weighing units, the external dimension of each weighing unit is 100 mm multiplied by 75mm multiplied by 80mm, the dimension of the material collecting box 8 is 70mm multiplied by 65mm multiplied by 70mm, and the device is arranged at the outlet position of the material collector of the automatic detection device.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a miniature automatic weighing device for on-line measuring which characterized in that: comprises a structural frame, an external connecting device, a sample collecting device, a turnover bottom plate (11) thereof, a weighing device, a sample emptying device and a control system,

the structural frame and outer connecting device comprises an outer frame (3), an annular connecting steel plate (1), a sealing rubber plate (2), a supporting cross beam (4) and an electromagnet (6), wherein a blanking port (9) is formed in the upper surface of the outer frame (3), a discharging port is formed in the left side surface of the outer frame (3), the annular connecting steel plate (1) is installed above the blanking port (9), the sealing rubber plate (2) is installed below the blanking port (9), the electromagnet (6) is installed below the sealing rubber plate (2), and the supporting cross beam (4) is transversely installed in the discharging port;

the sample collecting device comprises a material collecting box (8), a balancing weight (7) and a movably mounted turnover bottom plate (11), wherein the movably mounted turnover bottom plate (11) is arranged below the material collecting box (8), a limiting original piece is arranged between the movably mounted turnover bottom plate and the material collecting box (8), and the balancing weight (7) is arranged in the material collecting box (8) so that the resultant force direction of a gravity vector is positioned in front of the gravity center moving direction of the material collecting box (8) in the discharging process;

the sample emptying device comprises a material emptying push-pull rod (19), the material emptying push-pull rod (19) is connected with a discharging micro motor (18), the discharging micro motor (18) is arranged on the supporting beam (4), the material emptying push-pull rod (19) is Y-shaped, and the V end of the material emptying push-pull rod is hung on two sides of the sample collecting device to drive the sample collecting device to horizontally displace and guide the turnover plate to realize turnover discharging by taking the positioning block as a fulcrum; weighing device include via at least 3 miniature tension sensor (25) hoist in weigh layer board (24) in outer frame (3), weigh and be equipped with weighing unit on layer board (24), weighing unit including weigh layer board bearing support strip (26) with weigh arc recess (27) that the upper surface of layer board bearing support strip (26) was equipped with, weighing device with in the space between outer frame (3), form the working space that collection box (8) were collected, were adjusted, was emptied, was weighed, semi-cylindrical support bar (14) on upset bottom plate (11) with arc recess (27) morpheme correspondence.

2. The automatic miniature weighing device for on-line testing as set forth in claim 1, wherein: the limiting original piece is connected with the overturning base plate (11) through a vertical positioning pin (12), and the corresponding vertical positioning pin (12) penetrates through a corresponding round hole in an extending base plate (10) of the material collecting box (8).

3. The automatic miniature weighing device for on-line testing as set forth in claim 2, wherein: two sides of the turnover bottom plate (11) are respectively provided with an outward extending guide rod (13), the lower surface of the turnover bottom plate is provided with two semicircular supporting columns which are consistent with the outward extending guide rods (13) in direction, an inverted trapezoidal plate (15) is arranged below the supporting columns, the inverted trapezoidal plate (15) and the semicircular supporting columns are of an integral structure and are fixed on the lower surface of the turnover bottom plate (11), the outward extending guide rods (13) are positioned in hanging rings (20) arranged for the V ends of the discharge push-pull rods (19), and the inner area of the hanging rings (20) is larger than the outer contour area of the outward extending guide rods (13).

4. The automatic miniature weighing device for on-line testing as set forth in claim 1, wherein: the weighing pallet has an area to accommodate at least 2 sample collection devices and a corresponding number of weighing cells to independently measure the weight of each sample collection device.

5. The automatic miniature weighing device for on-line testing as set forth in claim 4, wherein: the input end of the control system is connected with the micro tension sensor (25), and the output end of the control system is connected with the discharging micro motor and the display screen.