CN2386424Y - Two-sided commercial spring balance with dial scale - Google Patents

Abstract

The utility model discloses a two-sided commercial spring dial hand balance, which belongs to the field of measurement. The two-sided commercial spring dial hand balance comprises a casing, a hand ring, a pointer, a dial, a weighing plate, a metering spring, a gear, a rack and a temperature compensator, wherein an annular groove is arranged in the upper part of the casing, three supporting points are arranged in the annular groove, and the hand ring is arranged in the annular groove, and is in contact with the three supporting points. Because the hand ring of the utility model is supported by the three supporting points, and can rotate in the annular groove, the distance of a main supporting point and the structural center of the hand balance is shortened, and the swing performance of the balance body is greatly reduced. Thus, the weighing precision of the two-sided commercial spring dial hand balance is enhanced, and the two-sided commercial spring dial hand balance has simple structure.

Description

Two-sided commercial spring scale hand scale

The utility model relates to commercial spring scale hand scale, belongs to metering field.

Suspension type or portable spring scale scale are a kind of popular, popular measurement instruments, generally form by bracelet, pointer, scale, weight plate, tooth bar, gear shaft and temperature compensator etc., have simple in structure, cost is low, be easy to carry, easy to use, be difficult for cheating, advantage such as durable, be applicable to interim stand, huckster.But also exist shortcomings such as error is big, precision is low, and its sling point is far away excessively apart from structure centre, easily produces swing, the reading difficulty for transverse axis.

The purpose of this utility model provides a kind of precision height, two-sided commercial spring scale hand scale simple in structure.

For achieving the above object, the utility model adopts following solution:

Two-sided commercial spring scale hand scale comprises housing, bracelet, pointer, scale, weight plate, metering spring, gear shaft, tooth bar and temperature compensator, housing has ring groove in the top, be provided with three fulcrums in the groove, bracelet is installed in this ring groove and with three fulcrums and contacts.

Display also is housed in the housing, and this display is made up of slide block, guide rod, display board and lever, and slide block is contained in the housing cinclides by two guide rods, and the slide block lateral surface is equipped with display board, is provided with the lever hinged with it in it, and torsion spring is housed on the jointed shaft; Lever is provided with two projectioies up and down, and last projection is shorter than lower convexity; Stage clip is equipped with in two guide rod upper ends.

Housing is fastened by symmetrical two the identical halfbodies of structure and forms.To simplify production technology, make simple in structure.

The cross sectional shape of the used steel wire of metering spring is a rectangle, to eliminate its hysteresis phenomenon.

The utility model makes the raising of weighing precision because bracelet by supported at three point, and can rotate, and the distance of main fulcrum and hand scale structure centre shortens, and has reduced the swing of scale body greatly in ring groove, simple in structure.

The utility model is described in further detail below in conjunction with drawings and Examples.

Fig. 1 is the utility model contour structures synoptic diagram.

Fig. 2 is the utility model inner structure synoptic diagram.

Fig. 3 is the cut-open view along the I-I line shown in Figure 2.

Fig. 4 is the structural representation of the utility model display.

Fig. 5 is the structural representation of slide block shown in Figure 4.

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

Fig. 7 is a display board plate face synoptic diagram shown in Figure 4.

Wherein: 1, display aperture 2, pointer 3, scale 4, housing 5, weight 6, steelyard hook 7, weight plate 8, metering spring 9, gear shaft 10, tooth bar 1, pull bar 12, temp-controlling element 13, connecting rod 14, control rocking bar 15, location rocking bar 16, crossbeam 17, bearing plate 18, zeroing turn-knob 19, bracelet 20, driving lever 21, cover plate 22, guide rod 23, stage clip 24, lever 25, slide block 26, display board 27, torsion spring.

Embodiment:

Fig. 1 and Fig. 2 provide a profile of the present utility model and a cut-away view, its display part is by the scale 3 of pointer 2, band display aperture 1, display board 26, and gear shaft 9, tooth bar 10 constitutes, the metering bearing part is made of weight plate 7 and metering spring 8, and this two-part structure is same as the prior art.The temperature compensator that the utility model adopts, form by control rocking bar 14, location rocking bar 15, temp-controlling element 12, connecting rod 13 and pull bar 11, control rocking bar 14 forward laps with location rocking bar 15, equal in length, its B end is articulated in a B with housing 4 usefulness axle, the A end of control rocking bar 14 is slide hinged in the some A of weight plate 7 with tooth bar 10, and rocking bar 15 fixed points in location are articulated in the some A ' (coinciding with the back side of an A) of weight plate 7.One end and the rocking bar 14 of connecting rod 13 are articulated in a G, and an end rigidity of temp-controlling element 12 is riveted on the some G ' of rocking bar 15 (coinciding with a G back side), and the H end of pull bar 11 is riveted on a H with its free end, and the K end is articulated in a K with the other end of connecting rod 13.Temp-controlling element 12 and connecting rod 13 are contained in the top of control rocking bar 14, and control rocking bar 14 is 20 °～35 ° with the included angle of horizontal direction.

The principle of work of temperature compensator is: when temperature by T ₀Be changed to T ₁The time, temp-controlling element is swing to the left or to the right just, is given in T ₁The angle increment Δ φ of temperature lower link 13, and pass to control rocking bar 14, then be given in temperature T at its A end ₁Down, as the maximum rated weighing Wmax of weighing W, i.e. compensation total amount Δ f during W=Wmax ₂, rocking bar 14 is according to the ratio of actual weighing W and maximum rated weighing Wmax simultaneously, and promptly ε=W/Wmax provides actual compensation rate Δ f ₂', the temperature error Δ f that the A ' end of this compensation rate and location rocking bar 15 reflects ₁Equal and opposite in direction, direction is opposite, i.e. Δ f ₂'=Δ f ₁, offset just, reach the purpose of temperature compensation, eliminated the precise information of temperature error, pass to the gear shaft 9 that is engaged with through tooth bar 10, the pointer 2 that is contained in its two ends just indicates the accurate weight of weight simultaneously on front and back scale 3.

Display (referring to Fig. 3 and Fig. 4) also is housed in housing 4 in the utility model, constitutes by slide block 25, display board 26, lever 24, guide rod 22, stage clip 23, cover plate 21 and torsion spring 27.Slide block 25 is contained in the ad hoc slot on housing 4 webs by two two pairs of holes of A, B of passing on its two ends flap, fixing display board 26 on its bottom surface, corresponding with display aperture 1, two crect ears and lever 24 on its base plate are articulated in an O, and torsion spring 27 is housed on the jointed shaft, in order to hold up lever 24, leave the space of length a before its D end, suit stage clip 23 on two guide rods 22 after its E end, and the some B of lever 24 is stuck on the cover plate 21, point A is the wedge shape, and some C is shorter than an A.When an A is touched, put B and free with cover plate 21 around the rotation of O point, under the promotion of stage clip 23, slide block 25 reaches raise with time point C.When external force promotes to move after some C makes slide block, some B will produce and block with cover plate 21, with moving behind the time point C, free with external force.

Housing 4 tops in the utility model have ring groove (referring to Fig. 2), bracelet 19 is contained in this groove, and with one main two auxilliary three-point support structure, the distance of main fulcrum D and structure centre O is shorter, reduced of the swing of scale body greatly, thereby increased the stability of pointer for transverse axis; Two auxilliary fulcrum F and E are partly accepting and partly rejecting for bracelet, guarantee the accuracy of weighing; Bracelet 19 is with a D ₁The back center of circle can turn left and right, and can not transmit moment of flexure for the scale body, prevents from use to practise fraud.

The structure left-right symmetric of housing 4, thereby available two parts with spline structure fasten and form, to simplify technology, to reduce cost.The needs that be to adapt to the big weight of scale are eliminated the intrinsic hysteresis phenomenon of metering spring 8, and used section of steel wire shape can be used rectangle.The utility model is by 18 regulation and control of zeroing knob.

Below whole principle of work of the present utility model and use are set forth.

To be suspended from the steelyard hook 6 by the weight 5 of weighing, gravity acts on the metering spring 8 through weight plate 7, thereby spring produces downward displacement, to eliminate the accurate numerical value of temperature error with hinged control rocking bar of weight plate 14 and location rocking bar 15, pass to and its meshed gears axle 9 through tooth bar 10, be contained in the pointer 2 at its two ends, on front and back scale 3, will indicate the weight of weight 5 exactly.

In the present embodiment, the ratio of gear i=2 of kinematic train, when promptly finishing a maximum rated weighing, pointer takes two turns, so display is housed in scale, is provided with display aperture 1 on the relevant position of scale 3.When the weight W of weight 5 half less than maximum Wmax, promptly W is less than 1/2Wmax, and the impulse stroke f of Dui Ying metering spring 8 is less than 1/2f with it ₂(f ₂Nominal operation stroke for metering spring 8), display aperture 1 shows " O ", and pointer 2 this moment pointed data on scale 3 promptly are the actual weights of weight 5.When W 〉=1/2 Wmax, corresponding with it have f 〉=f ₂, be contained in the some C that driving lever 20 on the weight plate 7 will be crossed lever 24, front contact A this moment, B is descended and free with cover plate 21, slide block 25 reaches, 1 of display aperture goes out " b " (when Wmax=8kg, b=1/2Wmax=4kg then), the weight W=W of thing 5 that weighed this moment ₁(display aperture demonstration weight)+W ₂(pointer indication weight).

In sum, in the present embodiment, the number reading method of the thing of being weighed is: W=W ₁+ W ₂

After the unloading, spring 8 resets, and driving lever 20 will be stuck on the some C of lever 24, when drive slide block 25 resetted, some B lifted rising with cover plate 21 and blocks, and some C will reduce height to be freed with driving lever 20, because 2 distance L of A, C are greater than a+26 (the 6th, the thickness of driving lever 20), so the neutral phenomenon can not take place.

Claims (4)

1. two-sided commercial spring scale hand scale, comprise housing, bracelet, pointer, scale, weighing plate, metering spring, gear shaft, tooth bar and temperature compensator, it is characterized in that: housing has ring groove in the top, be provided with three fulcrums in the groove, bracelet is installed in this ring groove and with three fulcrums and contacts.

2. two-sided commercial spring tolerance hand scale according to claim 1, it is characterized in that: display also is housed in the described housing, this display is made up of slide block, guide rod, display board and lever, slide block is contained in the housing cinclides by two guide rods, the slide block lateral surface is equipped with display board, be provided with the lever hinged in it, torsion spring is housed on the jointed shaft with it; Lever is provided with two projectioies up and down, and last projection is shorter than lower convexity; The stage clip of two guide rod upper end dresses.

3. two-sided commercial spring scale hand scale according to claim 1 is characterized in that: described housing is fastened by symmetrical two the identical halfbodies of structure and forms.

4. two-sided commercial spring scale hand scale according to claim 1, it is characterized in that: the cross sectional shape of the used steel wire of described metering spring is a rectangle.

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