CN2385321Y

CN2385321Y - Double straight face commercial spring dial balance

Info

Publication number: CN2385321Y
Application number: CN 99222102
Authority: CN
Inventors: 袁振盛
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-08-26
Filing date: 1999-08-26
Publication date: 2000-06-28
Anticipated expiration: 2009-08-26

Abstract

The utility model discloses a double straight face commercial spring dial balance, belonging to the metering field. The utility model comprises a casing, a serving tray, a pointer, a dial, a weighing rod, a gear shaft, a rack bar, a metering spring, and a temperature compensator. The section shape of the steel wire used by the metering spring is rectangular. The ratio of length and width of the rectangle is 2-4.5. The utility model adopts the metering spring wound by the steel wire with rectangular section, which can effectively eliminate the intrinsic hysteresis phenomenon of the spring. The utility model has the advantages of high using precision and convenient use.

Description

Twoly face commercial spring scale counter scale directly

The utility model relates to two faces commercial spring scale counter scale directly, belongs to metering field, the weighing apparatus class.

At present, a large amount of spring counter scales that use have monocline breadboard scale on the market, and the double inclined plane counter scale is faced counter scale directly with two, the rocker-type temperature compensator is housed to improve its precision in these counter scales.Two spring scale counter scales of facing directly mainly are made up of housing, pallet, pointer, scale, gear shaft, tooth bar, weighing thick stick, metering spring and temperature compensator, because the used section of steel wire of metering spring is circular, the hysteresis phenomenon of spring is serious, and size is big more, this situation is serious more, influence its precision, restricted its development.

The purpose of this utility model provides a kind of precision height, two commercial spring scale counter scales of facing directly simple in structure.

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

Two commercial scale counter scales of spring of facing directly comprise housing, pallet, pointer, scale, weighing thick stick, gear shaft, tooth bar, metering spring and temperature compensator, and the cross sectional shape of the used steel wire of metering spring is a rectangle.The length breadth ratio of this rectangle is 2～4.5.

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 hole of housing wall 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, and stage clip is equipped with in two guide rod upper ends.

The used section of steel wire of metering spring of the present utility model is a rectangle, can effectively eliminate the intrinsic hysteresis phenomenon of spring, the weighing precision is improved greatly, and do not increase other optional feature, makes simple in structure.

Below in conjunction with drawings and Examples the utility model is described further.

Fig. 1 is a contour structures synoptic diagram of the present utility model.

Fig. 2 is an inner structure synoptic diagram of the present utility model.

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

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

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

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

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

Wherein: 1, pointer 2, display aperture 3, scale 4, pallet 5, front vertical plate 6, back vertical plate 7, metering spring 8, column 9, thing dish 10, zeroing turn-knob 11, gear shaft 12, tooth bar 13, air damper 14, pull bar 15, temp-controlling element 16, tooth bar seat 17, control link 18, kinematic link 19, rocking bar 20, bearing 21, weighing thick stick 22, base 23, limit hinge 24, spandrel girder 25, driving lever 26, cover plate 27, lever 28, stage clip 29, display board 30, slide block 31, torsion spring 32, guide rod f ₂, metering spring nominal operation stroke a, ram travel δ, driving lever thickness

Embodiment:

Fig. 1 and Fig. 2 have provided profile of the present utility model and cut-away view, its display part is by pointer 1, and the scale 3 of band display aperture 2, display board 29, gear shaft 11, tooth bar 12 are formed, and the metering bearing part is by metering spring 7, weighing thick stick 21 is formed, and this is same as the prior art.Difference is that metering spring 7 adopts the parallel wire coiling, because square-section modulus (W=bh ²/ b) much larger than the suitable round section modulus of size (W=π d ³/ 32), but only in the length (h) wide (b) of square-section than being h/b=2～4.5 o'clock, just can receive the effect of expection.

The temperature compensator that the utility model is adorned constitutes (referring to Fig. 2) by temp-controlling element 15, control link 17, kinematic link 18, pull bar 14, bearing 20 and rocking bar 19: temp-controlling element 15 is riveted on the longeron of weighing thick stick 21 by bearing 20 rigidity, and its free end and pull bar 14 are riveted on a C.The B end of rocking bar 19 is articulated in a B with front vertical plate 5, and with the inclination angle of surface level be φ (20 °≤φ≤35 °), its A end is articulated in an A with control link 17, kinematic link 18, two connecting rod sizes equate, the position forward laps, and constituting ∠ Rt Δ ACD with temp-controlling element 15, pull bar 14, is to be hypotenuse.Right-angle side AC be the effective length of element 15 by calculating, right-angle side CD is that pull bar 14 is by structures shape.Hypotenuse AD, promptly two connecting

rods

17 and 18 length are obtained by Pythagorean theorem.Control link 17 is articulated in a D with pull bar 14, and the other end of kinematic link 18 and tooth bar 12 are articulated in a D ' (coinciding with a D behind), 12 whiles of tooth bar be slidingly connected with tooth bar seat 16 (only can slide along vertical).The principle of temperature compensation is: when temperature by T ₀Change to T ₁The time, temp-controlling element 15 just correspondingly shakes to the left or to the right, by being to be given in T ₁The displacement increment that is equivalent under the temperature be subjected to maximum rated weighing Wmax to do 7 generations of time spent metering spring is Δ f ₁, meanwhile spring is at real load W ₁The displacement increment that effect produces down is Δ f ₂, Δ f ₁Pass to rocking bar 19 by control link 17, ratio mechanism rocking bar will be by ratio η=W ₁/ Wmax determines correction amount f ₁', Δ f ₁' with Δ f ₂Equal and opposite in direction, direction is opposite, i.e. Δ f ₁'=Δ f ₂Correction amount f ₁' pass to tooth bar 12 by kinematic link 18, give the gear shaft 11 that is engaged with by tooth bar 12 with revised accurate data transfer, thereby the purpose of temperature compensation occurred, be contained in the pointer 1 at gear shaft 11 two ends, on front and back scale 3, indicate W simultaneously ₁Accurate weight.

Regulator control system of the present utility model is made of zeroing turn-knob 10 and air damper 13.The cylinder body of air damper 13 is fixed on the back vertical plate 6, and piston rod and the semi-girder that is fixed on weighing thick stick 21 longerons are hinged, regulates its knob just hunting frequency and the time of may command pointer.

Also be provided with display in the housing of the present utility model, it is contained on the pallet 4, slide block 30 passes two pairs of holes of A, B on its two ends flap by two guide rods 32, be fixed in the specific oblong aperture on the pallet 4, lever 27 is articulated in an O with slide block 30, and can be around an O swing, dress torsion spring 31 on jointed shaft, tightly hold up lever 27, left the space that length is a before the D of slide block 30 end, this is the stroke of slide block 30, after the E end, have stage clip 28 to be sleeved on the guide rod 32, its elastic force is the power that promotes the slide block reach.Display board 29 is fixed on the bottom surface of slide block 30, and is corresponding with the display aperture 2 on the scale 3.On lever 27, some B and cover plate 26 hold out against and block, and some A is the wedge shape, and the distance that is higher than between a C, A, C is L 〉=a+2 δ, and δ is the thickness of driving lever 25 in the formula, when metering spring 7 loads, to drive weighing thick stick 21 and dress driving lever 25 thereon moves down simultaneously, when its amount of movement l less than 1/2f ₂(f ₂Nominal operation stroke for metering spring 7) time, display aperture 2 shows " 0 ", as its amount of movement l 〉=1/2f ₂The time, driving lever 25 is crossed a C point of arrival A, because squeezing action, lever 27 is rotated around an O, and some A moves down, and some B and cover plate 26 are freed, slide block 30 at the promotion lower edge of stage clip 28 guide rod 32 forward pitch from a, 2 of display aperture demonstrate b (b is a concrete constant, and its value is 1/2 of specified maximum capacity), and this time point C raises.When resetting after metering spring 7 unloadings, driving lever 25 blocks to drive on the slide block 30 with some C and moves, and behind the arrival location, under torsion spring 31 effects, the some B of lever 27 lifts with cover plate 26 and blocks, and descends with time point C, frees with driving lever 25.Because A, C spacing L 〉=a+2 δ, under any circumstance, the some C after the rising will be in the top of driving lever 25, can not produce the situation that resets and lost efficacy.

The whole principle of work of the utility model are as follows: will be placed on the thing dish 9 by the weight of the amount of moving, gravity acts on the metering spring 7 through column 8, weighing thick stick 21, thus produce on the vertical to bottom offset.One end and front and

back riser

5 and 6 are hinged, and the upper and lower spacing hinge that the other end and weighing thick stick 21 are hinged guarantees that weighing thick stick 21 is not crooked in moving, and guarantees that the amount of moving is accurate.The precise information that to eliminate temperature error with the rigidly connected temp-controlling element 15 of the longeron of weighing thick stick 21, control link 17, kinematic link 18, rocking bar 19 and tooth bar 12 passes to gear shaft 11, be contained in the pointer 1 of this axial end, just on front and back scale 3, indicate weight of heavy exactly.

In the present embodiment, the ratio of gear i=2 of kinematic train, when promptly finishing a maximum rated weighing, pointer 1 takes two turns, so display is housed in scale, is provided with display aperture 2 on the relevant position of scale 3.When load W less than maximum rated weighing Wmax half, when promptly W was less than 1/2Wmax, the impulse stroke f of Dui Ying metering spring 7 was less than 1/2f with it ₂(f ₂For measuring big rated travel), then display aperture shows " 0 ", the pointed data of pointer this moment promptly are the actual weights of weight.

When W 〉=1/2Wmax, corresponding with it have f 〉=1/2f ₂, being contained in the some C that driving lever 25 on the weighing thick stick 21 will be crossed lever 27 this moment, front contact A makes slide block 30 reaches, so display aperture 2 is showed b (when Wmax=20, then b=1/2Wmax=10), the weight W=demonstration weight (W of the thing of being weighed this moment ₁)+pointer indication weight (W ₂).

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

Claims

1. face commercial spring scale counter scale directly for one kind pair, comprise housing, pallet, pointer, scale, weighing thick stick, gear shaft, tooth bar, metering spring and temperature compensator, it is characterized in that: the cross sectional shape of the used steel wire of metering spring is a rectangle.

2. face commercial spring scale counter scale directly for according to claim 1 pair, it is characterized in that: the cross section length-width-ratio of the used steel wire of described metering spring is 2～4.5.

3. face commercial spring scale counter scale directly for according to claim 1 pair, it is characterized in that: display also is housed in the described housing, and this display is made up of slide block, guide rod, display board and lever, and slide block is contained in the hole of housing wall by two guide rods; 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, and stage clip is equipped with in two guide rod upper ends.