Conveying tank and manufacturing method thereof, and pumping equipment with conveying tank

A technology of pumping equipment and conveying cylinder, which is applied to the components, mechanical equipment, pump elements, etc. of the pumping device for elastic fluid, and can solve the problem of insufficient support for high-hardness electroplating layer, hard chrome layer falling off, low hardness, etc. problems, to achieve good anti-peeling ability, improve life, improve the effect of hardness

Active Publication Date: 2012-12-05
ZOOMLION HEAVY IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] This direct electroplating hard chromium process is simple to operate, but has the following disadvantages: 1), the hardness of ordinary carbon steel and low alloy steel as the base material is low, not enough to support the high hardness electroplating layer, when pressed by high hardness particles Micro-deformation occurs, resulting in damage to the high-hardness electroplating layer; 2), the hardness of the high-hardness hard chromium layer is quite different from that of the substrate, and there is a large stress on the joint surface, which causes the hard chromium layer to easily fall off
3) The hard chromium layer with high hardness is thicker and has more microcracks. During use, the cracks are easy to expand under the action of stress, causing the local hard chromium layer to fall off
"Although the delivery cylinder prepared by this method has improved corrosion resistance and bonding force to a certain extent, its milky white chrome hardness is low, generally HRC45-55, and the thickness is only 20-30 microns, which is not enough Support the hard chromium layer with high hardness on the outer layer; at the same time, the thickness of the hard chromium layer with high hardness is still relatively thick, reaching 280-300 microns. The thicker the thickness, the greater the internal stress of the layer, which makes the hard chromium layer still easy to fall off

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The preparation method is as follows:

[0045] Preparation of the preparatory cylinder: manufacture the cylinder according to the specifications, bore and roughly grind until the surface roughness of the cylinder is 0.8, the inner diameter is 0.6mm smaller than the product, the straightness is 0.5, and the ellipticity is 0.03.

[0046] Prepare the electroplating solution: the electroplating solution is CrO with a concentration of 230g / L 3 and H at a concentration of 2.3 g / L 2 SO 4 , mixed and prepared according to the ratio of 100:1.12;

[0047] Pre-plating treatment: degreasing and derusting the delivery cylinder;

[0048] Surface activation before primary electroplating: preheat the electroplating solution to 65°C, place the delivery cylinder in the plating tank, wait for the delivery cylinder to heat up to 65°C, perform reverse current activation treatment, and the current density is 50A / dm 2 , time 30s;

[0049] Primary plating: current density is 45A / dm 2 , t...

Embodiment 2

[0055] The preparation method is as follows:

[0056] Preparation of the preparatory cylinder: manufacture the cylinder according to the specifications, bore and roughly grind until the surface roughness of the cylinder is 0.8, the inner diameter is 0.6mm smaller than the product, the straightness is 0.5, and the ellipticity is 0.03.

[0057] Prepare the electroplating solution: the electroplating solution is CrO with a concentration of 260g / L 3 and H at a concentration of 2.8 g / L 2 SO 4 , mixed and prepared according to the ratio of 100:1.28;

[0058] Pre-plating treatment: degreasing and derusting the delivery cylinder;

[0059] Surface activation before primary electroplating: preheat the electroplating solution to 70°C, place the delivery cylinder in the plating tank, wait for the delivery cylinder to heat up to 70°C, and perform reverse energization activation treatment with a current density of 55A / dm 2 , time 30s;

[0060] Primary electroplating: current density is...

Embodiment 3

[0066] The preparation method is as follows:

[0067] Preparation of the preparatory cylinder: manufacture the cylinder according to the specifications, bore the hole, and roughly grind until the surface roughness of the cylinder is 0.8, the inner diameter is 0.6mm smaller than the product, the straightness is 0.5., and the ellipticity is 0.03.

[0068] Prepare the electroplating solution: the electroplating solution is CrO with a concentration of 250g / L 3 and H at a concentration of 2.5 g / L 2 SO 4 , mixed and prepared according to the ratio of 100:1.20;

[0069] Pre-plating treatment: degreasing and derusting the delivery cylinder;

[0070] Surface activation before primary electroplating: preheat the electroplating solution to 68°C, place the delivery cylinder in the plating tank, wait for the delivery cylinder to heat up to 68°C, and perform reverse current activation treatment with a current density of 52A / dm 2 , time 30s;

[0071] Primary plating: current density is ...

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Abstract

The invention discloses a conveying tank and a manufacturing method thereof, and pumping equipment with the conveying tank. The manufacturing method for the conveying tank comprises the following steps of: machining to form a preparation tank body; performing primary electroplating on the surface of the preparation tank body, and performing dehydrogenation treatment on a plating layer after the primary electroplating to form a first chromium layer with the rigidity of HRC58 to 60 and the thickness of 0.15 to 0.2mm; and performing secondary electroplating on the surface of the first chromium layer to form a second chromium layer with the rigidity of HRC66 to 68 and the thickness of 0.15 to 0.2mm so as to form the conveying tank. In the method, the first hard chromium layer and the second hard chromium layer which have matched thickness and rigidity are electroplated on the inner surface of the tank body, so that the abrasion resistance of the whole conveying tank is improved, the anti-stripping capacity of all the hard chromium layers is improved, and the service life of the conveying tank is prolonged.

Description

technical field [0001] The invention relates to the field of concrete construction, in particular to a delivery cylinder, a preparation method thereof and pumping equipment including the same. Background technique [0002] Traditional viscous material conveying cylinders, such as concrete conveying cylinders, mostly use ordinary carbon steel or low alloy steel as the base material of the cylinder body, and a certain thickness of hard chromium layer is directly plated on the base material to improve the wear resistance life of the conveying cylinder. [0003] This direct electroplating hard chromium process is simple to operate, but has the following disadvantages: 1), the hardness of ordinary carbon steel and low alloy steel as the base material is low, not enough to support the high hardness electroplating layer, when pressed by high hardness particles Micro-deformation occurs, resulting in damage to the high-hardness electroplating layer; 2), the hardness of the high-hardn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D5/14F04B53/16
Inventor 陈毅玮廖孟安荣冉升申仕达
Owner ZOOMLION HEAVY IND CO LTD
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