CN214702443U

CN214702443U - Physical density balance for middle school students

Info

Publication number: CN214702443U
Application number: CN202121354363.7U
Authority: CN
Inventors: 廖良英; 黄逸轩
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-06-18
Filing date: 2021-06-18
Publication date: 2021-11-12
Anticipated expiration: 2031-06-18

Abstract

The utility model belongs to the field of density balances, and discloses a physical density balance for middle school students, which comprises a base, a measuring cylinder and a beaker, wherein the base is of a trapezoidal structure with a narrow top and a wide bottom; the upper surface of the base is provided with a weighing component, and the weighing component is used for measuring the weight of the liquid; the weighing component comprises a scale plate, a pointer, a scale, a vernier, a supporting plate, a connecting shaft and a cross beam; by recording the mass difference and the volume of the dangerous liquid flowing into the measuring cylinder, the density of the liquid is obtained by the formula rho ═ (M1-M2)/V, the steps do not need students to manually pour the liquid in the beaker into the measuring cylinder, and the danger caused by liquid overflow is avoided.

Description

Physical density balance for middle school students

Technical Field

The utility model belongs to the density balance field, concretely relates to middle school student's physical density balance.

Background

Density is a measure of the mass within a particular volume, and is equal to the mass of an object divided by the volume, and a middle school physics measurement of solid density requires three steps: measuring mass M by a mass balance, (II) measuring volume V by a drainage method, and (III) calculating rho-M/V. The method for measuring the density of the liquid is also completed in four steps: firstly, pouring a proper amount of liquid to be measured into a beaker, and measuring the total mass M1; secondly, pouring part of liquid in the beaker into a measuring cylinder, and measuring the volume V; (III) measuring the total mass M2 of the residual liquid and the beaker, and (IV) calculating rho ═ M1-M2)/V.

When measuring the density of dangerous liquid, the student can not touch the liquid to prevent accident. In the above measurement method, the density measurement of the liquid requires a student to pour a dangerous liquid into the measuring cylinder, and in this step, the risk of liquid splashing is liable to occur.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a middle school student's physical density balance measures the density of liquid in flowing into the beaker through tap through the subassembly of weighing, reads out the volume of liquid in the graduated flask again, can calculate out the density of liquid.

In order to achieve the above object, the utility model provides a following technical scheme: a physical density balance for middle school students comprises a base, a measuring cylinder and a beaker, wherein the base is of a trapezoidal structure with a narrow top and a wide bottom, a placing groove and an object placing groove are arranged on the upper surface of the base, and the placing groove is used for bearing the measuring cylinder;

the upper surface of the base is provided with a weighing component, and the weighing component is used for measuring the weight of the liquid; the weighing component comprises a scale plate, a pointer, a scale, a vernier, a supporting plate, a connecting shaft and a cross beam; the bottom end of the supporting plate is fixedly connected to the upper surface of the base, and the top end of the supporting plate is provided with a circular groove; the connecting shaft is rotatably connected with the inner wall of the circular groove; the cross beam is rotatably connected with the supporting plate through a connecting shaft, trays are fixedly connected to two ends of the cross beam, and a beaker is arranged at one end of the cross beam close to the measuring cylinder; the bottom of the pointer is fixedly connected with the connecting shaft, and the scale plate is fixedly connected with the outer surface of the supporting plate; the scale is fixedly connected to the outer surface of the supporting plate, a rectangular sliding rail is arranged on the outer surface of the scale, and the vernier is connected with the inner wall of the rectangular sliding rail in a sliding mode.

Preferably, the outer surface of the base is provided with a balance assembly, and the balance assembly comprises two gradienters, two balance nuts and four support shafts; two spirit levels fixed connection is respectively in the adjacent both sides of base, balance nut sets up with crossbeam both ends terminal surface threaded connection respectively, four back shaft evenly distributed is in the base lower surface, back shaft and base lower surface threaded connection set up.

Preferably, the article holding groove is internally provided with an article holding assembly, and the article holding assembly comprises weights and a groove cover; the weights are arranged inside the object placing groove, and the groove cover and the inner surface of the object placing groove are rotatably connected.

Preferably, the outer surface of the cross beam is provided with an adjusting assembly and a tray, and the adjusting assembly comprises a bolt, a tension spring, a circular opening and a sliding block; the sliding block is sleeved on the outer surface of the beam, and a beaker is loaded in the tray; tray fixed connection is in slider top surface, crossbeam surface symmetry evenly is provided with a plurality of circular openings, the bolt runs through the surface of slider and sets up with circular opening inner wall sliding connection, tension spring both ends difference fixed connection is in the surface of slider surface and bolt.

Preferably, the outer surface of the beaker is fixedly connected with a water tap, and the water tap is communicated with the inside of the beaker.

Preferably, the diameter of the plug is equal to the inner diameter of the circular opening.

The technical scheme has the following technical effects:

1. before the balance measures the weight, the four support shafts are adjusted to enable the two gradienters to be in a horizontal state, after the bottom plate is kept horizontal, the balance nut is adjusted to enable the pointer to be located in the middle of the scale plate, and at the moment, the cross beam is kept horizontal; then pouring the dangerous liquid into a beaker, placing the beaker on a tray after the liquid is stable, placing the weight on another tray, moving the floating weight to enable the pointer to be positioned at the middle position of the scale plate again, namely keeping the beam horizontal, and recording the reading M1 at the moment; then the tap is opened, the dangerous liquid part flows into the measuring cylinder, the tap is closed, after the liquid is stable, the volume V of the liquid in the measuring cylinder is read, the weighing step is repeated again, the reading M2 is recorded, and the density of the dangerous liquid can be obtained through the formula rho ═ (M1-M2)/V; the above steps do not require students to manually pour the liquid in the beaker into the measuring cylinder, so that the danger caused by the overflow of the liquid is avoided.

2. When the mass of the liquid and the beaker is greatly different from the limit range of the weight, the adjusting assembly can be used for changing the force arm of the two trays; the bolt is outwards pulled out this moment, and the slider can slide along the crossbeam, can stop sliding when the round opening is aimed at to the bolt, loosens the bolt, then the bolt resets under the tension spring effect, repeats above-mentioned step of weighing once more, can obtain the weight of liquid plus beaker.

Drawings

FIG. 1 is a schematic diagram of the overall structure of a physical density balance for middle school students;

FIG. 2 is a rear view of a physical density balance for middle school students;

fig. 3 is an enlarged schematic view of a structure in fig. 1.

Wherein: 1. a base; 2. a weighing assembly; 201. a tray; 202. a scale plate; 203. a pointer; 204. a scale; 205. a run number; 206. a support plate; 207. a connecting shaft; 208. a cross beam; 3. a balancing component; 301. a level gauge; 302. a balance nut; 303. a support shaft 303; 4. an article placing component; 401. a weight; 402. a slot cover; 5. a faucet; 6. an adjustment assembly; 601. a bolt; 602. a tension spring; 603. a circular opening; 604. a slider; 7. a measuring cylinder; 8. and (4) a beaker.

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. 1-3, the technical solution provided by the present invention is: a middle school student physical density balance comprises a base 1, a measuring cylinder 7 and a beaker 8, wherein the base 1 is of a trapezoidal structure with a narrow top and a wide bottom, the upper surface of the base 1 is provided with a placing groove and a storage groove, and the placing groove is used for bearing the measuring cylinder 7;

the upper surface of the base 1 is provided with a weighing component 2, and the weighing component 2 is used for measuring the weight of liquid; the weighing assembly 2 comprises a scale plate 202, a pointer 203, a scale 204, a vernier 205, a support plate 206, a connecting shaft 207 and a cross beam 208; the bottom end of the supporting plate 206 is fixedly connected to the upper surface of the base 1, and the top end of the supporting plate 206 is provided with a circular groove; the connecting shaft 207 is rotatably connected with the inner wall of the circular groove; the beam 208 is rotatably connected with the supporting plate 206 through a connecting shaft 207, both ends of the beam 208 are fixedly connected with the tray 201, and one end of the beam 208 close to the measuring cylinder 7 is provided with the beaker 8; the bottom of the pointer 203 is fixedly connected with the connecting shaft 207, and the scale plate 202 is fixedly connected with the outer surface of the supporting plate 206; ruler 204 fixed connection is in the backup pad 206 surface, and ruler 204 surface is equipped with the rectangle slide rail, and slide connection sets up with rectangle slide rail inner wall with vernier 205.

Thus, pouring the dangerous liquid into the beaker 8, after the liquid is stable, placing the dangerous liquid on the tray 201, placing the weight 401 on the other tray 201, moving the slider 205 to enable the pointer 203 to be located at the middle position of the scale plate 202 again, namely the beam 208 is kept horizontal, and recording the reading M1 at the moment; then the tap 5 is opened, the dangerous liquid part flows into the measuring cylinder 7, the tap 5 is closed, after the liquid is stable, the volume V of the liquid in the measuring cylinder 7 is read, after the weighing step is repeated again, the reading M2 is recorded, and the density of the dangerous liquid can be obtained through the formula rho ═ (M1-M2)/V.

Referring to fig. 1 and 2, a balance assembly 3 is disposed on an outer surface of a base 1, and the balance assembly 3 includes two levels 301, two balance nuts 302, and four support shafts 303; two spirit levels 301 are fixed connection in the adjacent both sides of base 1 respectively, and balance nut 302 sets up with crossbeam 208 both ends terminal surface threaded connection respectively, and four back shaft 303 evenly distributed are in base 1 lower surface, and back shaft 303 sets up with base 1 lower surface threaded connection.

In this way, before the balance measures the weight, the four support shafts 303 are adjusted to make the two levels 301 in the horizontal state, and after the base 1 is kept horizontal, the balance nut 302 is adjusted to make the pointer 203 located at the middle position of the scale plate 202, and at this time, the beam 208 is kept horizontal.

Referring to fig. 1, an article holding assembly 4 is disposed inside the article holding tank, and the article holding assembly 4 includes a weight 401 and a tank cover 402; the bottom of the shallow groove is provided with a circular groove, the weight 401 is arranged in the circular groove, and the groove cover 402 is rotatably connected with the inner surface of the shallow groove.

So, set up and put the thing groove and easily accomodate weight 401, avoided losing of weight 401 well, increased balance life.

Referring to fig. 1 and 3, an adjusting assembly 6 and a tray 201 are disposed on an outer surface of the beam 208, and the adjusting assembly 6 includes a latch 601, a tension spring 602, a circular opening 603, and a slider 604; the sliding block 604 is sleeved on the outer surface of the beam 208, and the beaker 8 is loaded in the tray 201; tray 201 fixed connection is in slider 604 top surface, and crossbeam 208 surface symmetry evenly is provided with a plurality of circular openings 603, and bolt 601 runs through the surface of slider 604 and sets up with circular opening 603 inner wall sliding connection, and tension spring 602 both ends are fixed connection in the surface of slider 604 and the surface of bolt 601 respectively.

Thus, when the mass of the liquid plus beaker 8 is significantly different from the limit range of the weight 401, the adjusting assembly 6 can be used to change the moment arms of the two trays 201; at this time, the latch 601 is pulled out, the slider 604 can slide along the cross beam 208, the sliding can be stopped when the latch 601 is aligned with the circular opening 603, the latch 601 is reset under the action of the tension spring 602 when the latch 601 is released, and the weighing step is repeated again, so that the weight of the liquid and the beaker 8 can be obtained.

Referring to fig. 1 and 3, a faucet 5 is fixedly connected to an outer surface of the beaker 8, and the faucet 5 is communicated with an interior of the beaker 8.

Thus, the liquid in the beaker 8 can be enabled to flow out to the measuring cylinder 7 by using the water faucet 5, and accidents are avoided.

Referring to fig. 3, the diameter of the plug 601 is equal to the inner diameter of the circular opening 603.

So, avoided tray 201 to take place to rock when weighing, promoted the precision of device.

Details not described in the present specification are well known to those skilled in the art.

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. A middle school student physical density balance comprises a base (1), a measuring cylinder (7) and a beaker (8), wherein the base (1) is of a trapezoidal structure with a narrow top and a wide bottom, a placing groove and an object placing groove are formed in the upper surface of the base (1), and the placing groove is used for bearing the measuring cylinder (7); the method is characterized in that:

the upper surface of the base (1) is provided with a weighing component (2), and the weighing component (2) is used for measuring the weight of liquid; the weighing assembly (2) comprises a scale plate (202), a pointer (203), a scale (204), a vernier (205), a support plate (206), a connecting shaft (207) and a cross beam (208); the bottom end of the supporting plate (206) is fixedly connected to the upper surface of the base (1), and a circular groove is formed in the top end of the supporting plate (206); the connecting shaft (207) is rotatably connected with the inner wall of the circular groove; the cross beam (208) is rotatably connected with the supporting plate (206) through a connecting shaft (207), both ends of the cross beam (208) are fixedly connected with the tray (201), and one end of the cross beam (208) close to the measuring cylinder (7) is provided with a beaker (8); the bottom of the pointer (203) is fixedly connected with the connecting shaft (207), and the scale plate (202) is fixedly connected with the outer surface of the supporting plate (206); scale (204) fixed connection is in backup pad (206) surface, scale (204) surface is equipped with the rectangle slide rail, rider (205) and rectangle slide rail inner wall sliding connection set up.

2. The middle school physical density balance according to claim 1, wherein: a balance assembly (3) is arranged on the outer surface of the base (1), and the balance assembly (3) comprises two gradienters (301), two balance nuts (302) and four support shafts (303); two spirit level (301) fixed connection is in base (1) adjacent both sides respectively, balance nut (302) set up with crossbeam (208) both ends terminal surface threaded connection respectively, four back shaft (303) evenly distributed is in base (1) lower surface, back shaft (303) and base (1) lower surface threaded connection set up.

3. The middle school physical density balance according to claim 1, wherein: an article placing component (4) is arranged in the article placing groove, and the article placing component (4) comprises weights (401) and a groove cover (402); the weight (401) is arranged inside the storage groove, and the groove cover (402) is rotatably connected with the inner surface of the storage groove.

4. The middle school physical density balance according to claim 1, wherein: an adjusting component (6) and a tray (201) are arranged on the outer surface of the cross beam (208), and the adjusting component (6) comprises a bolt (601), a tension spring (602), a circular opening (603) and a sliding block (604); the sliding block (604) is sleeved on the outer surface of the cross beam (208), and the tray (201) is internally provided with a beaker (8); tray (201) fixed connection is in slider (604) top surface, crossbeam (208) surface symmetry evenly is provided with a plurality of circular openings (603), bolt (601) run through the surface of slider (604) and set up with circular opening (603) inner wall sliding connection, tension spring (602) both ends respectively fixed connection in the surface of slider (604) surface and bolt (601).

5. The middle school physical density balance according to claim 1, wherein: the outer surface of the beaker (8) is fixedly connected with a water tap (5), and the water tap (5) is communicated with the interior of the beaker (8).

6. The middle school physical density balance according to claim 4, wherein: the diameter of the plug pin (601) is equal to the inner diameter of the circular opening (603).