阅读说明：本技术 一种卧式离心机螺旋的加工工艺 (Processing technology of horizontal centrifuge spiral ) 是由 邓祥明 于 2021-09-02 设计创作，主要内容包括：本申请涉及一种卧式离心机螺旋的加工工艺,涉及卧式离心机的技术领域,其包括S1、下料；S2、预处理；S3、画线；S4、叶片焊接；S5、叶片修正；S6、叶片喷合金；S7、叶片打磨；S8、校平衡。本申请具有提高螺旋输送器的螺旋叶片的硬度和耐腐蚀性的效果。(The application relates to a processing technology of a horizontal centrifuge spiral, which relates to the technical field of horizontal centrifuges and comprises S1 and blanking; s2, preprocessing; s3, drawing a line; s4, welding the blades; s5, correcting the blade; s6, spraying alloy on the blade; s7, polishing the blade; and S8, balancing. The application has the effect of improving the hardness and the corrosion resistance of the helical blade of the screw conveyor.)

1. A processing technology of a horizontal centrifuge spiral is characterized in that: the method comprises the following steps:

s1, blanking: feeding the helical blade (2) and the cylinder (1);

s2, preprocessing: roughly and finely turning the cylinder body (1), correcting circumferential runout of each part of the cylinder body (1), and repairing center holes (3) at two ends of the cylinder body (1) to enable the center holes (3) at the two ends to be coaxial; adopting a clamp matched with the width of the helical blade (2) for forming the helical blade (2) to bend the helical blade (2);

s3, drawing lines: drawing a position line of the helical blade (2) on the cylinder body (1) by a worker according to a design drawing;

s4, welding the blades: fixing the helical blade (2) on the position line of the corresponding helical blade (2), and welding and fixing the helical blade (2) and the barrel (1) in a spot welding manner;

s5, blade correction: shaping the helical blades (2) according to the design size, and adjusting the distance and the angle between two adjacent helical blades (2) along the length direction of the screw conveyor; roughly and finely turning the external dimension of the helical blade (2); polishing the helical blade (2) by using a polishing machine;

s6, blade alloy spraying: spraying nickel-based alloy on the helical blade (2), wherein the thickness of the alloy within 10 mm close to the edge of the helical blade (2) can only be subjected to tolerance but cannot be subjected to tolerance reduction;

s7, blade grinding: polishing the spiral blade (2) sprayed with the alloy according to a preset size;

s8, leveling: and (3) taking the center holes (3) at the two ends as a reference, and respectively performing rough machining and finish machining on the spiral blade (2) by using a balancing machine to ensure that the balance weights at the two ends of the spiral conveyor are within the design precision.

2. The processing technology of the horizontal centrifuge spiral of claim 1, characterized in that: the processing technology further comprises the following steps:

s6-1: ni45 nickel-based alloy powder is sprayed until the thickness of the alloy is 0.45 to 0.5 mm; s6-2: ni55 nickel base alloy powder is used for covering.

3. The processing technology of the horizontal centrifuge spiral according to claim 2, characterized in that: in S6, the Ni45 Ni-based alloy powder had a thickness of 0.5 mm, and the alloy layer had an overall thickness of 2 mm.

4. The processing technology of the horizontal centrifuge spiral of claim 1, characterized in that: in S4, a plurality of reinforcing ribs are welded between the helical blades (2) on the conical barrel (12).

5. The processing technology of the horizontal centrifuge spiral of claim 1, characterized in that: the processing technology further comprises the following steps:

s8-1: coarse balancing: roughly balancing the spiral blade (2) by using a balancing machine until the balance weights at two ends of the whole spiral conveyor are between 60 and 80 grams;

s8-2: polishing: carrying out surface polishing treatment on the semi-finished product screw conveyor prepared in the step S8-1;

s8-3: cleaning treatment: cleaning the semi-finished product screw conveyor prepared in the step S8-2;

s8-4: and (3) carrying out fine balance processing on the spiral conveyor by using a balancing machine until the balance weights at two ends of the whole spiral conveyor are less than 10 g, and recording specific numerical values.

6. The processing technology of the horizontal centrifuge spiral of claim 1, characterized in that: in S1, the spiral blade (2) is cut by a plasma copying cutting machine according to the shape of the edge of the spiral blade (2) in the flattened state in design.

7. The processing technology of the horizontal centrifuge spiral of claim 1, characterized in that: in S5, the barrel (1) is corrected by a lathe while detecting the amount of run-out of the barrel (1).

8. The process for machining a horizontal centrifuge screw according to claim 7, wherein: in S5, the coaxiality of the central holes (3) at the two ends of the cylinder (1) is less than or equal to 0.02 mm.

Technical Field

The application relates to the technical field of horizontal centrifuges, in particular to a processing technology of a horizontal centrifuge screw.

Background

The horizontal screw centrifuge is a screw discharge sedimentary centrifuge, and the main function of the horizontal screw centrifuge is to separate certain mixtures with poor characteristics by centrifugal force, such as the mixture of fixed or liquid with a large difference in specific gravity or particle diameter. The separated material A is pushed to a slag discharge port at the small end of the rotary drum to be discharged through a spiral blade on the spiral pusher, and the separated material B overflows through an overflow hole at the large end of the rotary drum.

Referring to fig. 1 in the related art, the screw conveyor of the horizontal centrifuge comprises a cylinder body 1, wherein the cylinder body 1 comprises a large cylinder body 11, a conical cylinder 12 and a small cylinder body 13, the large cylinder body 11, the conical cylinder 12 and the small cylinder body 13 are coaxially arranged, one end of the large cylinder body 11 is welded and fixed with the large end of the conical cylinder 12, and one end of the small cylinder body 13 is welded and fixed with the small end of the conical cylinder 12. The outer side of the cylinder 1 is provided with a helical blade 2. The screw conveyer of the horizontal screw centrifuge is mainly made of stainless steel and is directly used for normal production after annealing or solution treatment.

In view of the above-mentioned related technologies, in recent years, with the expansion of product subdivision functions, the rotation speed of the screw conveyor of the horizontal screw centrifuge is large, the gap between the screw blade and the inner side wall of the drum is small, and the hardness of the stainless steel screw blade is low. In the separation process, the material A extrudes the helical blade to cause the helical blade to deform, and the separation is not thorough or difficult to separate the material A from the material B.

Disclosure of Invention

In order to improve the hardness and the corrosion resistance of the helical blade of the screw conveyor, the application provides a processing technology of a horizontal centrifuge screw.

The application provides a processing technology of horizontal centrifuge spiral adopts following technical scheme:

a processing technology of a horizontal centrifuge spiral comprises the following steps:

s1, blanking: feeding the helical blades and the cylinder;

s2, preprocessing: roughly and finely turning the cylinder, correcting the circumferential runout of each part of the cylinder, and repairing the center holes at two ends of the cylinder to ensure that the center holes at two ends are coaxial; adopting a spiral blade forming clamp matched with the width of the spiral blade to bend the spiral blade;

s3, drawing lines: drawing a position line of the helical blade on the cylinder by a worker according to a design drawing;

s4, welding the helical blade: fixing the helical blade on the position line of the corresponding helical blade, and welding and fixing the helical blade and the cylinder in a spot welding manner;

s5, helical blade correction: shaping the helical blades according to the design size, and adjusting the distance and the angle between two adjacent helical blades along the length direction of the helical conveyor; roughly and finely turning the external dimension of the helical blade; polishing the helical blade by using a polishing machine;

s6, spraying alloy on the helical blade: spraying nickel-based alloy on the spiral blade, wherein the thickness of the alloy within 10 mm close to the edge of the spiral blade can only be subjected to tolerance addition but cannot be subjected to tolerance reduction;

s7, grinding the helical blade: polishing the spiral blade sprayed with the alloy according to a preset size;

s8, leveling: and taking the center holes at the two ends as a reference, and respectively performing rough machining and finish machining on the spiral blade by using a balancing machine to ensure that the balance weights at the two ends of the spiral conveyor are within the design precision.

By adopting the technical scheme, the spray welding deposition layer of the nickel-based alloy has good corrosion resistance, wear resistance and sliding wear resistance, the hardness of the spiral blade is improved, the possibility that the material A extrudes the spiral blade to deform or damage the spiral blade is reduced, the corrosion resistance of the spiral blade is improved, the service life of the spiral conveyor is prolonged, and the possibility that the separated material A and the separated material B are not completely separated is reduced. Meanwhile, the cylinder body is firstly corrected for circular runout, then the fixed helical blade is installed, and finally the helical conveyor is corrected and balanced, so that the inconsistency of the gaps between the helical blade and the inner side wall of the rotary drum is reduced, and the situation that the helical conveyor is blocked with the rotary drum in the high-speed rotating process is caused.

Preferably, S6-1: ni45 nickel-based alloy powder is sprayed until the thickness of the alloy is 0.45 to 0.5 mm; s6-2: ni55 nickel base alloy powder is used for covering.

Through adopting above-mentioned technical scheme, it is lower to adopt Ni45 nickel base alloy powder spray-welding melting point, and change and adhere to on the helical blade surface, helps reducing the condition that uses for a long time and lead to inside helical blade oxidation damage to take place, adopts Ni55 nickel base alloy powder to help improving helical blade's structural strength, improves helical blade's surface hardness to help reducing the material extrusion helical blade of high-speed rotation, make the condition of helical blade deformation take place.

Preferably, in S6, the Ni45 Ni-based alloy powder has a thickness of 0.5 mm and the entire alloy layer has a thickness of 2 mm.

Through adopting above-mentioned technical scheme, control spray welding thickness helps guaranteeing the spray welding layer quality, and it does not have the condition of Ni55 nickel base alloy to appear the subregion after reducing follow-up repair car and takes place, helps reducing the screw blade and spouts welding layer thickness inequality everywhere, leads to screw blade everywhere the circle range of beating great, and the influence is rectified the screw blade and is taken place everywhere structural strength's the condition.

Preferably, in S4, a plurality of reinforcing ribs are welded between the spiral blades on the tapered drum.

Through adopting above-mentioned technical scheme, the strengthening rib helps improving little stack shell and a conical drum's helical blade's structural strength, helps reducing simultaneously in whole welding process, helical blade on the little stack shell to the possibility of just being welded one side bending deflection, helps improving helical blade position accuracy on the barrel.

Preferably, the processing technology further comprises the following steps: s8-1: coarse balancing: roughly balancing and processing the spiral blade by using a balancing machine until the balance weight at two ends of the whole spiral conveyor is between 60 and 80 grams; s8-2: polishing: carrying out surface polishing treatment on the semi-finished product screw conveyor prepared in the step S8-1; s8-3: cleaning treatment: cleaning the semi-finished product screw conveyor prepared in the step S8-2; s8-4: fine balance: and (4) carrying out fine balance processing on the spiral blade by using a balancing machine until the balance weight at the two ends of the whole spiral conveyor is less than 10 g.

Through adopting above-mentioned technical scheme, carry out balanced processing to helical blade through balancing machine, help reducing helical blade round everywhere and beat, help reducing the in-process of auger delivery ware at the rotary drum internal rotation, the dead condition emergence of helical blade outside edge and rotary drum inside wall card.

Preferably, in S1, the spiral blade is cut by a plasma copying cutting machine according to the shape of the edge of the spiral blade in the flattened state in design.

By adopting the technical scheme, the plasma profiling cutting machine is adopted to cut the helical blade, so that the smoothness of the cutting surface of the helical blade is improved, the size precision of the helical blade is improved, the thermal deformation of the helical blade is small, and the stress generated by cutting the helical blade is reduced.

Preferably, in S5, the barrel is corrected by a lathe while detecting the amount of runout at each position of the barrel.

By adopting the technical scheme, before the helical blade is installed, the jumping quantity of each position of the barrel is reduced, the jumping quantity of the outer edge of the helical blade after the helical blade is welded is reduced, the influence of the previous steps on the helical blade is reduced, the subsequent processing is facilitated, and the whole quality of the screw conveyor is improved.

Preferably, in S5, the coaxiality of the central holes at both ends of the cylinder is 0.02 mm or less.

By adopting the technical scheme, the center holes at the two ends of the cylinder are used as the positioning reference for subsequently detecting and adjusting the helical blade, and the higher the coaxiality of the center holes at the two ends of the cylinder is, the more convenient the subsequent balance processing of the helical blade is, and the improvement of the overall quality of the helical conveyor is facilitated.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the double-layer nickel-based alloy is sprayed and welded on the surface of the spiral blade, so that the hardness and the corrosion resistance of the spiral blade are improved, the service life of the spiral blade is prolonged, and the possibility that the separated material A and the separated material B are not completely separated is reduced;

2. the thickness of the Ni45 nickel-based alloy layer and the Ni55 nickel-based alloy layer is controlled, so that the situation that the internal helical blade is oxidized and damaged due to long-time use of the helical blade is reduced, the surface hardness of the helical blade is ensured, and the possibility that the helical blade is deformed due to extrusion of materials is reduced;

3. the plasma profiling cutting machine is used for cutting the helical blade, so that the smoothness of a cutting surface of the helical blade is improved, the size precision of the helical blade is improved, the thermal deformation of the helical blade is small, and the stress generated by cutting the helical blade is reduced.

Drawings

Fig. 1 is a sectional view of a screw conveyor structure mainly embodying a horizontal centrifuge according to an embodiment of the present application.

FIG. 2 is a process diagram of the horizontal centrifuge spiral according to the embodiment of the present application.

Reference numerals: 1. a barrel; 11. a large cylinder body; 12. a tapered barrel; 13. a small barrel body; 2. a helical blade; 3. a central bore.

Detailed Description

The present application is described in further detail below with reference to figures 1-2.

The embodiment of the application discloses a processing technology of a horizontal centrifuge spiral, but the embodiment of the invention is not limited to the technology.

Referring to fig. 1 and 2, the processing technology of the horizontal centrifuge spiral comprises the following steps:

s1, blanking:

s1-1: cutting a blank of the helical blade 2 by a plasma profiling cutting machine according to the edge shape of the helical blade 2 in a designed middle flattening state;

s1-2: blanking the large barrel body 11, the conical barrel 12 and the small barrel body 13 by using a lathe, wherein machining allowances are reserved in the length and radial directions of the blanked large barrel body 11, conical barrel 12 and small barrel body 13;

s2, preprocessing:

s2-1: roughly and finely turning a large barrel body 11, a conical barrel 12 and a small barrel body 13: in the process of rough and finish turning of the large barrel body 11, because the large barrel body 11 has large mass, when the center hole 3 and the end face of the large barrel body 11 are turned, a center frame for supporting the barrel body 1 of the large barrel body 11 is respectively and additionally arranged at the positions of a point A and a point B on the large barrel body 11 as shown in figure 1;

s2-2: taking down the central frame, repairing the outer side surfaces of the positions where the point A and the point B are supported on the large cylinder body 11, and finely turning the large cylinder body 11;

s2-3: the large barrel body 11, the conical barrel 12 and the small barrel body 13 are respectively welded and fixed by an electric welding machine to form a barrel body 1;

s2-4: measuring the circular runout of the cylinder 1 at A, B, C, D, E positions in figure 1, marking the circular runout with steel marks, and using the circular runout as a circle calibration standard after welding the helical blade 2; repairing the cylinder body 1 to ensure that the circular runout of the point A is less than or equal to 0.05 mm, the circular runout of the point B is less than or equal to 0.05 mm, the circular runout of the point C is less than or equal to 0.3 mm, the circular runout of the point D is less than or equal to 0.4 mm, and the circular runout of the point E is less than or equal to 0.25 mm; the outer side surfaces of the supported positions of the point A and the point B on the heavy vehicle large cylinder body 11;

s2-5: repairing center holes 3 at two ends of the cylinder body 1, and enabling the coaxiality of the center holes 3 at the two ends to be less than or equal to 0.02 mm to be used as a processing reference after welding the helical blades 2;

s2-6: removing burrs on the opening edge of the helical blade 2 by using a grinding machine;

s2-7: adopting a clamp matched with the width of the helical blade 2 for forming the helical blade 2 to bend the helical blade 2 until the helical blade 2 is formed to the shape required by a product;

s3, drawing lines: drawing a position line of the helical blade 2 on the cylinder 1 by a worker according to a design drawing;

s4, welding the blades:

s4-1: according to the line-drawing position, the helical blade 2 and the barrel 1 are fixedly connected by adopting an electric welding machine in an argon arc welding spot welding mode, and the helical angle of the helical blade 2 refers to a design drawing;

s4-2: 3 to 4 reinforcing ribs are welded between the spiral blades 2 adjacent to each other along the length direction of the cylinder body 1 on the conical cylinder 12;

s4-3: welding all welding seams of the helical blade 2 and the barrel 1 by using an electric welding machine;

s4-4: cleaning welding slag on the welding seam, polishing the welding seam,

s5, blade correction:

s5-1: adopting a hammer to shape the blade pitch and the angle between the spiral blades 2 according to the design size, and eliminating welding stress;

s5-2: using the center holes 3 at the two ends as a reference, detecting and correcting A, B, C, D, E five-point circular runout of the helical blade 2 along the length direction of the helical conveyor by using a lathe, so that the circular runout of the point A is less than or equal to 0.2 mm, the circular runout of the point B is less than or equal to 0.4 mm, the circular runout of the point C is less than or equal to 0.2 mm, the circular runout of the point D is less than or equal to 0.6 mm, the circular runout of the point E is less than or equal to 0.6 mm, recording detection data, and correcting the helical blade 2 at the exceeding part;

s5-3: roughly and finely turning the helical blade 2, and keeping the single-side grinding allowance of 0.08 mm;

s5-4; taking out burrs generated by turning the helical blade 2 by using a grinding machine;

s6, blade alloy spraying: preheating the screw conveyor to 300-350 ℃;

s6-1: spraying Ni45 nickel-based alloy powder to the thickness of 0.45-0.5 mm by a metal powder spray welding gun;

s6-2: covering Ni55 nickel-based alloy powder by a metal powder spray welding gun until the total alloy thickness is 2 mm;

the thickness of the alloy within 10 mm close to the edge of the helical blade 2 can only be subjected to tolerance and cannot be subjected to tolerance reduction;

s6-4: after spray welding, the screw conveyor is placed in a heat preservation box for heat preservation for more than 24 hours;

s6-3: using center holes 3 at two ends as a reference, using a lathe to detect and correct A, B, C, D, E five-point circular runout of the helical blade 2 along the length direction of the helical conveyor, so that the circular runout of the point A is less than or equal to 0.2 mm, the circular runout of the point B is less than or equal to 0.4 mm, the circular runout of the point C is less than or equal to 0.2 mm, the circular runout of the point D is less than or equal to 0.6 mm, the circular runout of the point E is less than or equal to 0.6 mm, recording detection data, and using the lathe to correct the exceeded part of the helical blade 2;

s7, blade grinding: polishing the spiral blade 2 sprayed with the alloy according to a preset size;

s8, leveling: re-checking and correcting A, B, C, D, E five-point circular runout of the helical blade 2 along the length direction of the helical conveyor, ensuring that the circular runout of the point A is less than or equal to 0.2 mm, the circular runout of the point B is less than or equal to 0.4 mm, the circular runout of the point C is less than or equal to 0.2 mm, the circular runout of the point D is less than or equal to 0.6 mm, and the circular runout of the point E is less than or equal to 0.6 mm;

s8-1: coarse balancing: roughly balancing the spiral conveyor by using a balancing machine until the balance weights at two ends of the whole spiral conveyor are between 60 and 80 grams;

s8-2: polishing: carrying out surface polishing treatment on the semi-finished product screw conveyor prepared in the step S8-1;

s8-3: cleaning treatment: cleaning the semi-finished product screw conveyor prepared in the step S8-2;

s8-4: fine balance: carrying out fine balance processing on the spiral conveyor by using a balancing machine until the balance weight at two ends of the whole spiral conveyor is less than 10 g, and recording specific numerical values;

and S9, finishing inspection.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.