CN2811958Y

CN2811958Y - Portable weighing device

Info

Publication number: CN2811958Y
Application number: CN 200520012924
Authority: CN
Inventors: 董凤刚
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-06-29
Filing date: 2005-06-29
Publication date: 2006-08-30
Anticipated expiration: 2015-06-29

Abstract

A kind of lightweight weighing device, the counterweight and the heavy burden part that comprise the leveling arm beam of steelyard and act on fulcrum both sides on the leveling arm beam of steelyard, it is characterized in that: the described leveling arm beam of steelyard be provided with an excentric shaft and by supports support on an axis of excentric shaft and form the fulcrum of the above-mentioned leveling arm beam of steelyard, described heavy burden part acts on another axis of excentric shaft, thereby by the distance decision weight arm of force between two axis, and the distance decision counterweight arm of force between counterweight and the fulcrum, on the heavy burden part, apply weight, regulate the position of counterweight on the leveling arm beam of steelyard leveling arm beam of steelyard balance can be weighed.It is simple in structure, small and exquisite, installs, uses light and fast, and easily processing can effectively reduce production costs; And have weight change indication, a warning effect.

Description

The lightweight weighing device

Technical field

The utility model relates to a kind of lever-type lightweight weighing device, also has weight change indication, warning effect.

Background technology

At present, the weighing device of mechanical principle mainly adopts elastic deformation principle and two kinds of forms of lever principle.Utilize the weighing device of elastic deformation principle, its resilient material weighing device precision, reliability be difficult for guaranteeing, the higher installation cost of precision is very high; The lever construction weighing device is complex structure comparatively, and especially for the object that detects greater than double centner, volume is big, manufacturing cost is higher.

The utility model content

The technical assignment of the technical problems to be solved in the utility model and proposition is the complex structure heaviness that overcomes above-mentioned prior art existence, the defective of function singleness, and a kind of lightweight weighing device is provided.For this reason, the utility model adopts following technical scheme:

A kind of lightweight weighing device, the counterweight and the heavy burden part that comprise the leveling arm beam of steelyard and act on fulcrum both sides on the leveling arm beam of steelyard, it is characterized in that: the described leveling arm beam of steelyard be provided with an excentric shaft and by supports support on an axis of excentric shaft and form the fulcrum of the above-mentioned leveling arm beam of steelyard, described heavy burden part acts on another axis of excentric shaft, thereby by the distance decision weight arm of force between two axis, and the distance decision counterweight arm of force between counterweight and the fulcrum, on the heavy burden part, apply weight, regulate the position of counterweight on the leveling arm beam of steelyard leveling arm beam of steelyard balance can be weighed.

As the further of technique scheme improved and replenish, be tending towards compact and portable on its structure more and give its additional function so that make, the utility model also comprises following additional technical feature:

On the described excentric shaft sheathed respectively with the fulcrum roller and the heavy burden bearing of two axis coaxle, described fulcrum roller is by described supports support, described heavy burden part is sleeved on the described heavy burden bearing.

The described leveling arm beam of steelyard passes two axis of described excentric shaft.

Offer the threaded hole that passes two axis on the described excentric shaft, the described leveling arm beam of steelyard is connected with described threaded hole by the screw thread on it.

At the described leveling arm beam of steelyard along being provided with keeper on the direction of its fulcrum deflection.

At the described leveling arm beam of steelyard along being provided with the alarm actuating contact that links to each other with warning device on the direction of its fulcrum deflection.

The utility model compared with prior art has the following advantages: utilize excentric shaft effectively to shorten arm of force length in the lever construction, thereby reach the purpose of reduction means volume and alleviator deadweight, make device simply light; It is simple in structure, small and exquisite, installs, uses light and fast, and easily processing can effectively reduce production costs; And have weight change indication, a warning effect.

Below in conjunction with accompanying drawing the utility model is elaborated.

Description of drawings

Fig. 1 is the structural representation that the utility model claims.

Fig. 2 is that the A-A of Fig. 1 is to view.

Fig. 3 is that the B-B of Fig. 1 is to view.

Fig. 4 is the stereographic map of Fig. 1.

Fig. 5 is the structural representation of excentric shaft.

Fig. 6 is the vertical view of Fig. 5.

Fig. 7 is the utility model lever weighing principle figure (state shown in Figure 8).

Fig. 8 is the working state schematic representation that the utility model claims.

Fig. 9 is another working state schematic representation that the utility model claims.

Among the figure: 1. support member, 1a. side plate, 1b. side plate, 1c. mounting hole, 2. device web member, 3. excentric shaft, the section 3a. bear a heavy burden, 3b. fulcrum section, 3c. fulcrum section, 3d. heavy burden axis, 3e. fulcrum axis, 3f. threaded hole 4. stop screws, 5. the leveling arm beam of steelyard, 6. counterweight, 7. heavy burden part, 8a. fulcrum roller, 8b. fulcrum roller, 9. heavy burden bearing, 10. alarm actuating contact, O. fulcrum, L1. the weight arm of force, L2. the counterweight arm of force, L3. the arm of force of stop screw, G1. weight gravity, G2. Weight gravity, G3. stop screw is to the power of the leveling arm beam of steelyard, Δ M. bearing is to the moment of friction of excentric shaft, e. eccentric throw.

Embodiment

Weighing device shown in Fig. 1～4 mainly is made of the leveling arm beam of steelyard 5, counterweight 6, heavy burden part 7, excentric shaft 3 and support member 1:

Support member 1 is one The shape member offers a mounting hole 1c respectively and is used for the setting-up eccentricity axle on two side plate 1a, 1b, be connected with device web member 2 and as the stop screw 4 of keeper and the alarm actuating contact 10 that links to each other with warning device on its top board;

The leveling arm beam of steelyard 5 is a rod-like element, and it is provided with two sections screw threads, and one section screw thread is used for being connected with counterweight, so that regulate the position of counterweight on the leveling arm beam of steelyard, another section screw thread is used for being connected with excentric shaft;

Excentric shaft 3 (shown in Fig. 5,6) is for being divided into three sections, and two sections of two ends are coaxially set, and as

fulcrum section

3b, 3c, middle one section two sections off-centre with two ends are provided as the section 3a that bears a heavy burden, thereby have fulcrum axis 3e and heavy burden axis 3d on this excentric shaft 3; On the section 3a that bears a heavy burden, offer the threaded hole 3f that passes two axis; Suit heavy burden bearing 9 on the heavy burden section 3a of excentric shaft, heavy burden part 7 is sleeved on the heavy burden bearing 9;

Suit fulcrum roller

8a, 8b on fulcrum section 3b, the 3c at these excentric shaft two ends, and two fulcrum rollers are inlaid in respectively in the mounting hole 1c on support member biside plate 1a, the 1b and excentric shaft is supported on the support member; So far, fulcrum O promptly is positioned on the center line of two fulcrum rollers (in theory, this center line overlaps with the fulcrum section axis at excentric shaft two ends), and the distance between the center line of the center line of heavy burden bearing 9 and

fulcrum roller

8a, 8b is the weight arm of force (in theory, the distance between the two axial lines of this distance and excentric shaft is that eccentric throw is consistent).

Even excentric shaft 3 in the threaded hole 3f that is threaded in excentric shaft corresponding on the leveling arm beam of steelyard is formed with the leveling arm beam of steelyard 5 whole around fulcrum O deflection, the arm beam of steelyard 5 of leveling simultaneously and support member 1 be last stop screw 4 and alarm actuating contact 10 corresponding.Thereby according to this structure, the leveling arm beam of steelyard can be changed, so that change range.

The weighing device of said structure, when weighing (referring to Fig. 7): making heavy burden part 7 be subjected to the downward gravity of weight is that G1, the weight arm of force are L1 (eccentric distance e, it is a definite value); The gravity of counterweight 5 is that G2, the counterweight arm of force are L2; The power of 4 pairs of leveling arm beams of steelyard of stop screw is that G3, the arm of force are L3 (state shown in Figure 8); Bearing is Δ M to the moment of friction of excentric shaft, then according to lever balance theory following relation is arranged:

G1×L1＝G2×L2+G3×L3+ΔM …………(1)

When leveling arm beam of steelyard balance and device desire generation action, the power G3 of 4 pairs of leveling arm beams of steelyard of stop screw becomes 0, and bearing is that Δ M remains unchanged substantially to the moment of friction of excentric shaft, thereby can get:

G1＝(G2×L2+ΔM)/L1

This shows that weight weight can be calculated according to above-mentioned formula, therefore, on the leveling arm beam of steelyard, offer and the corresponding scale of counterweight (can change), can read weight weight easily.Reduce Δ M as far as possible, can reduce error (and when indicating scale, also can consider this factor).

Making G1 loss gravity is Δ G, then according to lever balance theory following relation (state shown in Figure 9) is arranged:

(G1-ΔG)×L1＝G2×L2-ΔM ………………(2)

Further get by (1) and (2)

ΔG＝(2ΔM+G3×L3)/L1?……………………(3)

To sum up tell, when the G1 gravity losses is that (during 2 Δ M+G3 * L3)/L1, weighing device moves, and touches alarm actuating contact 10 by the leveling arm beam of steelyard 5 and send the warning (see figure 9).According to these characteristics, this weighing device is arranged on the occasion of weighing that weight can change, whether leak such as being used to detect the liquid state or the gaseous state thing that place in the airtight container.

Warning precision of being installed as can be known by (3) and the size of Δ M have linear relationship, and Δ M is determined by the intrinsic friction factor of bearing, so this device can satisfy the needs in certain accuracy rating.

Claims

1, a kind of lightweight weighing device, the counterweight (6) and the heavy burden part (7) that comprise the leveling arm beam of steelyard (5) and act on fulcrum on the leveling arm beam of steelyard (O) both sides, it is characterized in that: the described leveling arm beam of steelyard (5) is provided with an excentric shaft (3) and is gone up and formed the fulcrum of the above-mentioned leveling arm beam of steelyard by the axis (3e) that support member (1) is supported on excentric shaft, described heavy burden part (7) acts on another axis (3d) of excentric shaft, thereby by the distance decision weight arm of force (L1) between two axis, and the distance decision counterweight arm of force (L2) between counterweight (6) and the fulcrum (O), on the heavy burden part, apply weight, regulate the position of counterweight on the leveling arm beam of steelyard leveling arm beam of steelyard balance can be weighed.

2, according to claims 1 described lightweight weighing device, it is characterized in that: described excentric shaft (3) go up sheathed respectively with the fulcrum roller (8a, 8b) and the heavy burden bearing (9) of two axis coaxle, described fulcrum roller (8a, 8b) is supported by described support member (1), and described heavy burden part (7) is sleeved on the described heavy burden bearing (9).

3, according to claims 1 or 2 described lightweight weighing devices, it is characterized in that: the described leveling arm beam of steelyard (5) passes two axis of described excentric shaft (3).

4, according to claims 3 described lightweight weighing devices, it is characterized in that: offer the threaded hole (3f) that passes two axis on the described excentric shaft (3), the described leveling arm beam of steelyard (5) is connected with described threaded hole by the screw thread on it.

5, according to claims 1 described lightweight weighing device, it is characterized in that: at the described leveling arm beam of steelyard (5) along being provided with keeper (4) on the direction of its fulcrum deflection.

6, according to claims 1 described lightweight weighing device, it is characterized in that: at the described leveling arm beam of steelyard (5) along being provided with the alarm actuating contact (10) that links to each other with warning device on the direction of its fulcrum deflection.