CN216386081U

CN216386081U - Miniature force cell

Info

Publication number: CN216386081U
Application number: CN202122760943.2U
Authority: CN
Inventors: 王建辉; 杨新勇
Original assignee: Shenzhen Moli Electronic Technology Co ltd
Current assignee: Shenzhen Moli Electronic Technology Co ltd
Priority date: 2021-11-12
Filing date: 2021-11-12
Publication date: 2022-04-26
Anticipated expiration: 2031-11-12

Abstract

The utility model belongs to the technical field of sensors, and particularly relates to a miniature force transducer which comprises a square frame and a shell, wherein the shell is fixed at the bottom end in the square frame; the object to be tested is arranged on the contact piece or the contact piece is directly in close contact with the object to be tested, so that the sliding sheet slides along the surface of the sliding column, the force generated by the contact between the object to be tested and the contact piece can be transmitted to the middle part of the pressing plate, the sliding column is convenient for sliding the sliding sheet up and down stably, and the force generated by pressing the object to be tested can be uniformly distributed on the surface of the pressing block, so that the piezoresistor obtains more accurate force value test data, and the problem that the existing sensor is not stressed uniformly because the object to be tested is not placed in place, and the accuracy of a test result is influenced is solved.

Description

Miniature force cell

Technical Field

The utility model belongs to the technical field of sensors, and particularly relates to a miniature force measuring sensor.

Background

The sensor is a sensing device for detecting a measured object, can sense information of the measured object, feeds back the information, converts a measurement result into an electric signal, and outputs the electric signal to the controller through a lead, so that the controller can make corresponding adjustment.

At present, in the process of stressing the sensor, the object to be tested is often required to be manually and accurately placed at the center of the sensor, but it cannot be ensured that the object to be tested is placed at the center of the sensor at one time, and if the object to be tested is not placed in place or the shape of the object to be tested is not uniform, the force of the object to be tested pressing downwards is not at the center of the sensor, so that the stressing of the sensor is not uniform, a large error occurs in the result measured by the sensor, and the accuracy of the test result is finally influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provides a miniature force transducer, which solves the problem that the accuracy of a test result is influenced by uneven stress caused by the fact that a measured object is not placed in place in the prior transducer.

The technical scheme adopted by the utility model for solving the technical problems is as follows: a miniature force transducer comprises a square frame and a shell, wherein the shell is fixed at the bottom end inside the square frame;

the upper end and the lower end of the square frame are respectively fixed with a top sheet and a bottom sheet, the lower end of the bottom sheet is connected with a bottom cover through screws, a battery box is arranged at the lower end of the shell and above the bottom cover in an inserting mode, and a circuit board, a support frame, an elastic body and a pressing block are sequentially arranged in the shell and above the battery box from bottom to top;

the upper end of the pressing block extends out of the upper end of the shell and is in sliding connection with the upper end of the shell, a pressing plate located inside the square frame is arranged at the upper end of the pressing block, and four corners of the pressing plate are in sliding connection with four corners inside the square frame respectively;

the clamp plate upper end middle part fixedly connected with runs through the slide bar of top piece upper end, the slide bar upper end is fixed with the gleitbretter, the gleitbretter upper end is fixed with three spliced poles that are cyclic annular distribution, the gleitbretter circumference encloses to alternate and is provided with three travelers that are cyclic annular distribution, the traveller is located adjacent two between the spliced pole, a plurality of the top is fixed with the contact piece between the spliced pole.

Specifically, the shell is positioned between the bottom plate and the pressing plate.

Specifically, a spring is sleeved between each sliding column and the sliding sheet and positioned between the sliding sheet and the top sheet, and the upper end and the lower end of the spring are fixedly connected with the lower end of the sliding sheet and the upper end of the top sheet respectively.

Specifically, the slide bar is located a plurality of between the traveller, every the traveller upper end just is located the gleitbretter top and all is fixed with spacing piece, every spacing piece all is located the contact piece below.

Specifically, the support frame upper end is provided with a plurality of and is the piezo-resistor that distributes around, piezo-resistor is located the elastomer below, every piezo-resistor all passes through the wire with the circuit board and is connected.

Specifically, the front end of the shell is provided with a signal wire, and the circuit board is connected with the signal wire and the battery box through conducting wires respectively.

Specifically, the four corners of the pressing block are all fixed with connecting pieces, and tension springs are fixed between the upper ends of the connecting pieces and the top of the inner wall of the shell.

Compared with the prior art, the utility model has the following beneficial effects: the testee is arranged in above the contact piece or the contact piece is direct and the testee in close contact with, thereby make the gleitbretter slide along the traveller surface, the clamp plate middle part can be conducted to the power that contacts and produce between testee and the contact piece, the traveller is convenient for slide the gleitbretter steadily from top to bottom, the spring is convenient for make the clamp plate reset after the testee breaks away from the contact piece, can guarantee that the testee exerts pressure produced power can evenly distributed on the briquetting surface, thereby let the briquetting drive the elastomer and push down piezo-resistor, make piezo-resistor obtain more accurate power value test data.

Drawings

FIG. 1 is a schematic view of the overall external structure of the present invention;

FIG. 2 is a right side view of the internal structure of the housing of the present invention;

FIG. 3 is a bottom view of the present invention;

fig. 4 is a partially enlarged view of structure a of the present invention.

In the figure: 1-contact piece, 2-connection piece, 3-spacing piece, 4-sliding column, 5-spring, 6-square frame, 7-pressing plate, 8-sliding rod, 9-shell, 10-signal line, 11-elastomer, 12-tension spring, 13-connecting piece, 14-piezoresistor, 15-supporting frame, 16-circuit board, 17-battery box, 18-bottom cover, 19-bottom piece, 20-top piece, 21-pressing piece and 22-sliding piece.

Detailed Description

Referring to fig. 1-4, the present invention provides a technical solution: a miniature force transducer comprises a frame 6 and a shell 9, wherein the shell 9 is fixed at the bottom end inside the frame 6;

a top sheet 20 and a bottom sheet 19 are respectively fixed at the upper end and the lower end of the square frame 6, the lower end of the bottom sheet 19 is connected with a bottom cover 18 through screws, a battery box 17 is arranged at the lower end of the shell 9 and above the bottom cover 18 in an inserting mode, and a circuit board 16, a support frame 15, an elastic body 11 and a pressing block 21 are sequentially arranged in the shell 9 and above the battery box 17 from bottom to top;

the upper end of the pressing block 21 extends out of the upper end of the shell 9 and is in sliding connection with the upper end of the shell, the upper end of the pressing block 21 is provided with a pressing plate 7 positioned inside the square frame 6, and four corners of the pressing plate 7 are in sliding connection with four corners inside the square frame 6 respectively;

the middle part of the upper end of the pressing plate 7 is fixedly connected with a sliding rod 8 penetrating through the upper end of the top plate 20, the upper end of the sliding rod 8 is fixedly provided with a sliding sheet 22, the upper end of the sliding sheet 22 is fixedly provided with three connecting columns 2 which are distributed in an annular shape, three sliding columns 4 which are distributed in an annular shape are arranged around the circumference of the sliding sheet 22 in an inserting manner, the sliding columns 4 are positioned between two adjacent connecting columns 2, and a contact piece 1 is fixed above the connecting columns 2;

the shell 9 is positioned between the bottom plate 19 and the pressing plate 7;

four corners of the pressing block 21 are fixed with connecting pieces 13, a tension spring 12 is fixed between the upper end of the connecting piece 13 and the top of the inner wall of the shell 9, and the connecting pieces 13 play a role in stably connecting the tension springs 12;

the object to be tested is placed on the contact sheet or the contact sheet is directly contacted with the object to be tested tightly, no matter the object to be tested is placed at any position on the contact sheet 1, the gravity of the object to be tested pressed down on the contact sheet 1 is transmitted to the surfaces of the three connecting columns 2, because the three connecting columns 2 form a stable triangular structure, the connecting columns 2 can also stably connect the contact sheet 1 with the sliding sheet 22, the connecting columns 2 uniformly disperse the force of the object to be tested on the contact sheet 1 on the surface of the sliding sheet 22, and the forces are gradually diffused to the circle center of the sliding sheet 22 from the circumference of the sliding sheet 22, so that the forces are gradually concentrated on the surface of the sliding rod 8, the sliding sheet 22 respectively slides down along the surfaces of the three sliding columns 4, the spring 5 is sleeved outside each sliding column 4 and between the sliding sheet 22 and the top sheet 20, the upper and lower ends of the spring 5 are respectively fixedly connected with the lower end of the sliding sheet 22 and the upper end of the top sheet 20, the spring 5 is compressed along with the sliding piece 22 to enable the spring 5 to have elasticity, the sliding columns 4 are convenient for enabling the sliding piece 22 to stably slide up and down, the sliding rods 8 are located among the sliding columns 4, the limiting piece 3 is fixed at the upper end of each sliding column 4 and above the sliding piece 22, each limiting piece 3 is located below the contact piece 1, and the limiting piece 3 limits the sliding piece 22 to prevent the sliding piece 22 from being separated from the sliding column 4;

the sliding rod 8 transmits force to the center of the pressing plate 7, so that the force generated by the contact between the object to be measured and the contact piece 1 is transmitted to the middle of the pressing plate 7, and the force is gradually and uniformly diffused from the center of the pressing plate 7 to the periphery of the center of the pressing plate 7, so that the force is uniformly distributed on the surface of the pressing plate 7, and the force generated by the pressing of the object to be measured can be uniformly distributed on the surface of the pressing block 21;

the slide sheet 22 which moves downwards presses the press plate 7 downwards by the slide bar 8, four corners of the press plate 7 respectively slide downwards along four corners inside the square frame 6, the press plate 7 presses the press block 21 downwards, the press block 21 moves downwards at the upper end of the shell 9, so that the press block 21 presses the elastic body 11, the upper end of the support frame 15 is provided with a plurality of piezoresistors 14 which are distributed front and back, the piezoresistors 14 are positioned below the elastic body 11, each piezoresistor 14 is connected with the circuit board 16 through a lead, the support frame 15 can stably install and support the piezoresistor 14 so as to be convenient for the piezoresistor 14 to be contacted with the pressed elastic body 11, the piezoresistor 14 senses the pressure of the detected object according to the pressure of the elastic body 11, thereby the press block 21 drives the piezoresistor 14 to be pressed by the elastic body 11, so that the piezoresistor 14 obtains more accurate force value test data, the front end of the shell 9 is provided with a signal line 10, the circuit board 16 is respectively connected with the signal wire 10 and the battery box 17 through conducting wires, so that the battery box 17 can supply power to the piezoresistor 14 conveniently;

during the process that the pressing plate 7 drives the pressing block 21 to move downwards, the tension spring 12 moves downwards along with the pressing block 21 to stretch, when the object to be tested is taken out from the upper end of the contact piece 1, the spring 5 rebounds to slide the sliding sheet 22 upwards along the sliding column 4, so that the sliding sheet 22 drives the pressing plate 7 to slide upwards along four corners inside the square frame 6 through the sliding rod 8, the lower end of the pressing plate 7 is separated from the upper end of the pressing block 21, the tension spring 12 retracts, and the tension spring 12 moves the pressing block 21 upwards to reset so as to be used next time.

Claims

1. A miniature load cell, includes square frame (6) and casing (9), casing (9) are fixed in square frame (6) inside bottom, its characterized in that:

a top sheet (20) and a bottom sheet (19) are respectively fixed at the upper end and the lower end of the square frame (6), the lower end of the bottom sheet (19) is connected with a bottom cover (18) through screws, a battery box (17) is arranged at the lower end of the shell (9) and above the bottom cover (18) in an inserting mode, and a circuit board (16), a support frame (15), an elastic body (11) and a pressing block (21) are sequentially arranged in the shell (9) and above the battery box (17) from bottom to top;

the upper end of the pressing block (21) extends out of the upper end of the shell (9) and is in sliding connection with the upper end of the shell, a pressing plate (7) located inside the square frame (6) is arranged at the upper end of the pressing block (21), and four corners of the pressing plate (7) are in sliding connection with four corners inside the square frame (6) respectively;

clamp plate (7) upper end middle part fixedly connected with runs through slide bar (8) of top piece (20) upper end, slide bar (8) upper end is fixed with gleitbretter (22), gleitbretter (22) upper end is fixed with three spliced poles (2) that are cyclic annular distribution, gleitbretter (22) circumference encloses to alternate and is provided with three traveller (4) that are cyclic annular distribution, traveller (4) are located adjacent two between spliced pole (2), a plurality of the top is fixed with contact piece (1) between spliced pole (2).

2. A miniature load cell as set forth in claim 1, wherein: the shell (9) is positioned between the bottom plate (19) and the pressing plate (7).

3. A miniature load cell as set forth in claim 1, wherein: and a spring (5) is sleeved between each sliding column (4) and the sliding sheet (22) and the top sheet (20), and the upper end and the lower end of the spring (5) are fixedly connected with the lower end of the sliding sheet (22) and the upper end of the top sheet (20) respectively.

4. A miniature load cell as set forth in claim 1, wherein: slide bar (8) are located a plurality of between traveller (4), every traveller (4) upper end just is located gleitbretter (22) top and all is fixed with spacing piece (3), every spacing piece (3) all are located contact piece (1) below.

5. A miniature load cell as set forth in claim 1, wherein: support frame (15) upper end is provided with a plurality of and is piezo-resistor (14) that the front and back distributes, piezo-resistor (14) are located elastomer (11) below, every piezo-resistor (14) all pass through the wire with circuit board (16) and are connected.

6. A miniature load cell as set forth in claim 1, wherein: the front end of the shell (9) is provided with a signal wire (10), and the circuit board (16) is respectively connected with the signal wire (10) and the battery box (17) through conducting wires.

7. A miniature load cell as set forth in claim 1, wherein: the four corners of the pressing block (21) are all fixed with connecting pieces (13), and tension springs (12) are fixed between the upper ends of the connecting pieces (13) and the tops of the inner walls of the shell (9).