Some standard content:
National Standard of the People's Republic of China
AGT type counter scale with weights This standard applies to AGT type lever-added snake counter scale. 1 Product model and specifications
1.1 Product model
UdC 681. 2
GB 336-85
Replaces GB 336-64
The product model of the counter scale is AGT type according to the provisions of GB3052-82 "Method for Compiling Product Models of Weighing Instruments". Arabic numerals represent the maximum weighing capacity in kilograms, separated by '~\ and the preceding Chinese phonetic letter. 1.2 Product specifications
The dimensions of the load-bearing pan (length × width or diameter) are expressed in millimeters. 2 Technical requirements
2.1 Production drawings
"Type" is preceded by
AGT type lever-added snake counter scale must comply with the provisions of this standard and be manufactured according to the drawings approved by the Ministry of Light Industry. 2.2 Bowl
2.2.1. The mass tolerance shall be positive according to the five-grade code. 2.2.2 The ratio of the mass of the bowl to the nominal weighing pan is 1:5. 2.2.3 The surface of the bowl shall be baked.
2.2.4 The sealing piece shall be flat, with no more than 1 mm protrusion or depression. 2.8 Weighing accuracy
The weighing accuracy is shown in the following table:
Weighing range
Empty scale-500d
> 500d2000d
200-Maximum scale
Note, d is the minimum scale value. bzxz.net
2. 4 Weighing at the bearing point
The weighing tolerance of each bearing point shall comply with the provisions of 2.3. 2.5 Sensitivity
The displacement of the balance pointer shall not be less than 3 mm. 2.6 Overload capacity
Must have an overload capacity of 125% of the maximum weighing. 2.7 Check weighing
The weighing tolerance of the maximum weighing and the empty scale should comply with the provisions of 2.3. National Bureau of Standards
2.8 Measuring lever
GB 336-85
2.81 The scale lines, numbers and signs should be accurate and clear, and the spacing between the scale lines should not be less than 1.5mm. The zero scale lines on both sides should be aligned, with an error of no more than 0.3mm.
2.8.2 The minimum scale value must be 1×10″, 2×10k, 5×10″ (k is a positive integer, a negative integer or), and the scale number n should comply with the provisions of G100384 "Accuracy level of non-automatic scales". 2.8.3 A balance water-pointing mechanism must be provided.
2.8.4 The arm ratio is 1:5.
2.9 Knife, knife bearing, wear-reducing plate, baffle, connecting rod, pull plate, adjustment plate 2.9.1 The hardness of the upper working part of the knife and wear-reducing plate is HRC58 ~ 62, and the surface finish is not lower than √ 6 2.9. 2 The hardness of the working part of the knife bearing and baffle is HRC62 ~ 66, and the surface finish is not lower than 7 6 2.9,3 The contact length between the knife blade and the knife bearing is not less than 75 of the matching length, and there should be no gap at both ends. 2.9.4 The hardness of the working part of the connecting rod, pull plate and adjustment plate is HRC50 ~ 55.2.9.5 The surface is not allowed to have cracks, interlayer burns and other defects. 2.9.6 The color of the oxide film is uniform and there should be no marks. 2.10 Assembly
2.10.1 The relative error of the height of the two sides of the bracket is not more than 0.5mm. 2.10.2 When the metering lever is in a balanced state, the weight and force blades should be in a horizontal position, and the height difference should not exceed 2mm. 2.10.3 The longitudinal displacement of the support, weight and force blade to the knife bearing (ring) should not exceed 1.5mm. 2.11 Castings
2.11.1 The surface should be flat, and the gate, riser, molding sand and adhesive must be removed. 2.11.2 There should be no defects such as cracks, shrinkage, cold shut, pores and slag inclusions. 2.11.$ For defects that do not affect the strength of parts, welding repair is allowed in accordance with relevant regulations. 2.12 Forgings
are not allowed to have defects such as cracks, interlayers, burns and slag. 2.13 The surface of stampings
should be smooth, the edges should be clear, and there should be no cracks and rust. 2.14 The weld of welded parts
should be smooth and meet the requirements of the drawings, and the welding slag should be removed. 2.15 The coating of electroplated parts should be uniform in color and should not have defects such as spots, bubbles, exposed bottom and scratches. 2.16 Painted parts The paint film should be uniform in color and should not have defects such as missing coating, wrinkles, scratches and falling off. 3 Inspection rules 3.1-Generally, the original products must be inspected by the government metrology department (or the unit entrusted by the government metrology department) according to the inspection procedures. After passing the inspection, they are stamped with the inspection seal and allowed to leave the factory. The inspection department of the manufacturer shall inspect the appearance, performance and packaging of the finished products before leaving the factory according to the drawings and relevant regulations approved by the Ministry of Light Industry, and issue the product certificate after passing the inspection. 3.2 Basic code The code used for proofreading and inspection is the fourth-class basic code. 3.3 Empty scale inspection
3.3.1 Lift or press the lever of the meter pan upwards or downwards to make it lose half balance and swing evenly. The distance between the upper and lower frames of the collimator should not exceed 1 mm. 3.3.2 After pushing the force point end of the metering lever to the → side of the collimator, the metering lever should be able to return to its original position with a deviation of not more than 5 nm. 3.3.3 Move the metering lever or the knife bearing (ring) along the longitudinal direction of the support, weight and force point blade to each limit position one by one. After moving, the swing of the measuring lever should not exceed 2 mm from the lower frame of the collimator. 3.4 Weighing pan inspection
3.4.1 Loading point inspection: Hang and place 10% of the maximum weighing weight, place the corresponding weighing weight at the center of the load-bearing pan, and then move to each load-bearing point position one by one (see figure). 3,4.2 Inspection of the graduation value of the measuring lever: move the lever to the maximum graduation position, and add the corresponding weight on the bearing plate. 3.4.3 Inspection of maximum weight: add the maximum weight on the concrete hanging, and add the maximum weight on the weighing plate. 3.4.3 Inspection of maximum weight: place the maximum weight on the concrete hanging, and add the maximum weight on the weighing plate. 4.4.3 Inspection of maximum weight: the product should be placed on the workbench during inspection. When inspecting according to 3,3 and 3,4, the workbench should be at the working point, and the measuring lever should be in the neutral state. ③ When inspecting according to 3.3.3 and 3.1, the measuring plate should be balanced. If it is unbalanced, the tolerance weight of the weighing section can be added on the bearing plate or other hanging to achieve balance.
3.5 Sensitivity inspection
When inspecting the sensitivity of 10% maximum weight and maximum weight, when the measuring lever is stationary, add the tolerance weight of the weighing section on the bearing plate, so that the three rods of the measuring mouse rise and stabilize and stop again. The distance between the two stationary points should be not less than 3mm. 3.6 Load capacity test
Add a weight of 125% of the maximum weighing on the load-bearing plate, hang and add a bowl of corresponding weighing, and the measuring lever can still swing normally. 3.7 Back-check weighing
When the load is reduced to the maximum weighing and the scale is empty, the error is not greater than the provisions of 2.3. 3.8 Assembly inspection
On the platform, use relevant instruments and indicators to inspect the following contents, which shall comply with the provisions of 2.10: a. The horizontal position of the measuring lever;
b. The longitudinal displacement of the blade of the measuring lever to the knife bearing; c. The relative error of the height of the bearings on both sides of the scale body bracket. 3.9 Knife bearing, wear-reducing plate, baffle inspection 3.9.1 Hardness inspection: Use a hardness tester to inspect 2 to 4 mm from the working part, and measure the hardness value of three points to take the average value. 3.9.2 Surface finish inspection: Compare with standard samples. 3.9. Appearance inspection 1 and measure.
3.10 Inspection of castings, forgings, stampings, welded parts, electroplated parts, oxidized parts and painted parts shall comply with the provisions of 2.11 to 2.16, and the appearance shall be visually inspected.
Marking, packaging, transportation and storage
4.1 Product marking
4.1.1 The measuring lever shall have the product model, the accuracy grade symbol of the scale, weighing, ratio, inspection stamp, name (code) number and manufacturing date.
GB336—B5
4.1.2 The bowl hanging shall have the factory number alternating with the measuring lever. 4,1,3 The movable load-bearing plate shall have the same factory number as the mother lever. 4.1.4 The bowl shall have weighing, ratio and inspection stamp. 4.1.5 The base shall have the product model and factory name: 4.2 Packaging marking
According to GB191-73 "Packaging, Storage and Transportation Instructions" and the regulations of the transportation department, the marking or label shall be applied. (The carton should be printed). 1.3 Product Packaging
4. More.1 Cartons are recommended for packaging, but other materials may be used. Moisture-proof measures should be taken inside the box. .3.2 One or two units can be packed in each box. 4.3.3 Moving parts must be tied firmly (moving parts of the meter lever should be fastened), and the whole product should be tied together to prevent movement. Loose materials should be used between parts to prevent friction and collision. 4.3.4 Anti-rust measures should be taken for exposed surfaces that are not oiled. Rust should not occur if stored under normal conditions for half a year from the date of leaving the factory. 4.3.5 The product certificate and instruction manual should be bundled together with the meter lever. 4.3.6 If there are special requirements for product packaging, they shall be agreed upon by both the supplier and the buyer. 4.4 Transportation
Be careful when transporting and loading. It is strictly forbidden to throw or hit anything. Prevent violent vibration and rain. 4.5 Storage
During storage and custody, the stacking should not touch the ground. Prevent rain and moisture. Do not store with corrosive items. Additional remarks:
This standard was proposed by the Ministry of Light Industry of the People's Republic of China. This standard was drafted by the AGT type case scale national standard drafting group. The main drafters of this standard are Jin Guiqing and Yang Jinyao.
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