CN2234614Y

CN2234614Y - Hand fruit hardness meter

Info

Publication number: CN2234614Y
Application number: CN 94222138
Authority: CN
Inventors: 赵文军
Original assignee: MUDANJIANG MACHINERY INST
Current assignee: MUDANJIANG MACHINERY INST
Priority date: 1994-09-16
Filing date: 1994-09-16
Publication date: 1996-09-04
Anticipated expiration: 2004-09-16

Abstract

A hand fruit hardness meter belongs to a mechanical metering device. An indenter of a measuring mechanism pressed by the fruit impacts a spring and the spring generates the impact displacement. A spindle being connected with the indenter drives a rack bar to drive a gear shaft and an arrow to rotate. The stopping mechanism makes the arrow accurately stop at the location of the value of the hardness of the measured fruit. The returning to zero mechanism can make the arrow get back to the home position for the convenience of the next measuring. The volume of the hand fruit hardness meter is small and the carrying of the meter is convenient. The measuring is accurate and the indication error is +-0.5 * 10<5> pa. The measurement result can be read out directly and the dial graduation is uniform. The long-term usage is stable. The hand fruit hardness meter is widely applied to the requires of the departments such as the fruit-bearing tree research, the fruit company, the fruit farm and so on.

Description

Hand held hardness of fruit meter

Hand held hardness of fruit meter belongs to the mechanical type measuring instrument.

The hardness of fruit of the prior art score is following several situations: when (1) mesa structure is used dish really is placed on the special shelf and can measures inconvenience.(2) imitate U.S.'s product thirties, the pressure head end area is 1cm ²And 0.5cm ²Two kinds, because the pressure head end area is bigger, required pressure is the more portable band of volume more then also, and it is big repeatedly to test labour intensity.(3) to develop the little measurement of a kind of penetrator diameter inaccurate for the Zhengzhou fruit tree research, and test data need convert through handling.(4) Japanese import model machine, the exquisite volume of outward appearance are urinated in carrying, and enter body cleaning difficulty but repeatedly test back fruit juice, and indicating value is inaccurate.

In order to overcome the shortcoming deficiency that existing hardness of fruit meter exists, satisfy units such as fruit tree research department, fruit company, fruit farm to cultivating fine seed strains, results are stored, are transported, add and measure the needs that its hardness provides the effect technique data man-hour, and the spy has invented hand held hardness of fruit meter.

Design concept: choose pressure head and power and all will and be easy to carry, take into account the measuring accuracy of instrument simultaneously from the volume of instrument.Hardness is exactly that an object resists that other are harder and the performance that the object of permanent strain is pressed into it does not take place.Promptly being under the effect of spring load P, is that the pressure head end of S is pressed in the tissue of tested fruit with area.The ratio of spring force P and pressure head end area S is defined as hardness of fruit value.Acting force P is directly proportional with the compression distance of spring.The core of utility model is an electrical measurement mechanism, ends stop mechanism and return-to-zero mechanism and forms.The pressure head of measuring mechanism connects in the main shaft lower end, and its upper end packs into spring packs in the axle sleeve, and axle sleeve connects in the housing lower end, and pointer is housed on the gear shaft, the gearing mesh on the rack and pinion axle in the gathering sill, and the lower surface contacts in the main shaft upper surface.The sheet that only stops that ends stop mechanism is installed on the gathering sill.Spring is inserted in the zero bar lower end of returning of return-to-zero mechanism, is contained in back in the zero bar overcoat, and the lower surface is in only stopping the sheet contact, and an end of hairspring is set on the gear shaft, and the other end is fixed on the gathering sill with pin.Gear shaft one end is positioned on that the other end is installed on the gathering sill on the mounting plate, and gathering sill is installed on the mounting plate.Mounting plate is installed in the housing.When pressure head was pressed into fruit surperficial, the resistance of fruit made pressure head in the main shaft LAP of boosting during measurement, and the spring in this moment axle sleeve is compressed, and main shaft promotes to move on the tooth bar, drives in it gear shaft that is meshed rotation.When length of spring compressed arrived to a certain degree, spring load forced pressure head to enter in the tissue of fruit, and the pointer on the gear shaft will illustrate hardness of fruit value.Also to overcome the friction force of only stopping sheet when need overcome the fruit resistance when spring is compressed, the power that tightens of oil silk and the friction force of each moving component.When pointer is specified the hardness number of fruit, only stop sheet and embrace gear shaft, prevent gear shaft to rotate, pointer is parked on the measured hardness of fruit value exactly.One press back zero bar in order to measure for the second time gently, its lower surface is depressed and is only stopped sheet, make and only stop sheet and gear shaft disengagement, gear shaft reverse rotation under the answer of oil silk constrictive force, pointer turns back to the original position, also be in original state in the gear shaft tooth bar that is meshed that cogs, can have so reused.

The advantage of utility model is: hold and use volume little in light weight easy to carry; Measure the accurate error of indication ± 0.5 * 10 ⁵Pa, measurement result is directly read; Dial scale is even, uses reliable and stable for a long time.Extensively be suitable for the needs of departments such as fruit tree research, fruit company, fruit farm.

Accompanying drawing: hand held hardness of fruit meter cross-sectional view.

Embodiment: housing 12 adopts the clock gauge watchcase, the standard component outsourcing, and mounting plate 6 gathering sills 10 have designed special tooling, have effectively guaranteed machining precision.The outward appearance of all parts is carried out surface treatment, as plating, blackout etc. in case burn into get rusty.Spring 3 is critical components, will realize that after bakingout process the power of spring is directly proportional with the distance of compression, has constant elasticity, very high static load intensity and fatigue resistance.Spring adopts 60Si ₂The Mn material, spring wire diameter 0.8mm, spring diameter 8mm, pitch 2.5mm is around 10.5 circles.Carry out stability test 1000 times with spring testing machine by stroke 10mm pressure after quenching, tempering heat treatment, the blackout assembling is used after linearity and the qualified stability, can guarantee the indicating value accuracy.Pressure head 1 face area is 0.107cm ², connecting in main shaft 2 with screw thread, cover upper spring 3 is packed in the axle sleeve 13, and axle sleeve 13 is set in housing 12 lower ends.Gear shaft 9 one ends are contained on the mounting plate 6 that studs with jewel, and the other end is installed on the gathering sill that studs with jewel, and the most advanced and sophisticated dress of gear shaft presses pointer 5, and tooth bar 8 is housed in the gathering sill 10, the gearing mesh of tooth bar 8 on gear shaft, and the lower end contacts in the main shaft upper surface.Only stop sheet 11 and be screwed on gathering sill 10, hairspring 4 one ends are set on the gear shaft 9, and its other end is fixed on the gathering sill 10 with pin.Gathering sill 10 is screwed on mounting plate 6.Mounting plate 6 is contained in the housing 12.Return zero bar 7 and be inserted in spring and pack into back in the zero bar overcoat, the lower surface is returned zero bar overcoat and is set in housing 12 upper ends in only stopping sheet 11 contacts.Complete machine has been adorned and has been debugged.

Claims

1, hand held hardness of fruit meter by measuring mechanism, end stop mechanism and return-to-zero mechanism is formed, it is characterized in that: the pressure head of measuring mechanism connects in the main shaft lower end, its upper end packs into spring and packs in the axle sleeve, axle sleeve connects in the housing lower end, pointer is housed on the gear shaft, the gearing mesh of tooth bar on gear shaft in the gathering sill, the lower surface contacts in the main shaft upper surface; The sheet that only stops that ends stop mechanism is installed on the gathering sill; Spring is inserted in the zero bar lower end of returning of return-to-zero mechanism, be contained in back in the zero bar overcoat, the lower surface is in only stopping the sheet contact, one end of hairspring is set on the gear shaft, the other end is fixed on the gathering sill with pin, and gear shaft one end is positioned on the mounting plate, and the other end is installed on the gathering sill, gathering sill is installed on the mounting plate, and mounting plate is installed in the housing.