CN105834043B - A kind of endoporus hot spray apparatus and method - Google Patents

Abstract

The invention relates to an inner hole thermal spraying device and method. Firstly, the inner wall of the pipe is subjected to sandblasting, derusting and roughening treatment; then, the pipe is fixed between the chucks A, and the motor is turned on so that the lead screw, the gear set and the rotating shaft are simultaneously Work, so that the spray gun bracket moves to the side of the rotary clamping device along the central axis of the pipe; when the port of the inclined section of the front terminal is aligned with the end of the pipe away from the chuck A, the paint nozzle is opened, and the front terminal moves to the end of the chuck A , the first layer of spraying is completed; finally, use the same method and use the inner hole thermal spraying device to spray the inner wall of the pipe fittings as a primer. The advantages of the present invention are: the space utilization rate of the paint nozzle of the inner hole thermal spraying device is small, and the inner wall of the pipe fitting with a smaller diameter can be sprayed, and the structural design is reasonable; at the same time, the connection is mechanically connected, which can be freely disassembled, the structure is simple, and the cost is low. It is cheap and solves the problem of spraying on the surface of the inner hole in the existing thermal spraying technology.

Description

A kind of inner hole thermal spraying device and method

technical field

The invention relates to the field of surface engineering, in particular to an inner hole thermal spraying device and method.

Background technique

Thermal spraying technology is a method of spraying molten spraying materials on the surface of parts through high-speed airflow to form sprayed coatings to prepare metal-based ceramic coatings. It appeared in the early 20th century, and Dr. M.U.Schoop of Switzerland first completed its spraying device in 1910. This technology has a wide range of spraying substrates and spraying materials, and is not limited; the spraying object can be complex parts, not limited by the shape of the parts; the operation is simple and convenient, and it can have a good effect on the wear resistance, hardness and thermal conductivity of the substrate. Improve the effect, and will not cause large stress deformation of the matrix and other advantages. Therefore, it plays an important role in the field of surface engineering and is mainly used for strengthening and repairing parts. As we all know, there are many input pipes connected to the thermal spray gun, which leads to a large operating space for the entire gun body, making it difficult to spray or fail to spray the inner wall of the tube with a small diameter due to the problem of the angle and depth of the spray gun, which eventually leads to The comprehensive performance of parts is difficult to improve, which affects their service life. Therefore urgently need to develop a kind of inner hole thermal spraying device and method that space utilization rate is little, spraying is convenient and improves the service life of parts, after searching, do not find the same or similar technical scheme with the present invention.

Contents of the invention

The technical problem to be solved by the present invention is to provide an inner hole thermal spraying device and method with small space utilization rate, convenient spraying and improved service life of parts.

In order to solve the above technical problems, the technical solution of the present invention is: an inner hole thermal spraying device, the innovation point of which is that it includes a worktable, a rotary clamping device and a feeding device arranged above the workbench;

The upper end surface of the workbench has a slide rail along the long axis direction, and a motor is installed on the inner side, and the end of the motor is connected to a lead screw arranged along the long axis direction of the workbench;

The rotary clamping device is arranged on the side away from the motor above the workbench, and mainly includes a box body, a rotating shaft arranged at the end of the box body, and a chuck A; a gear set with an input end and an output end is installed in the box body, The input end is connected to the end of the lead screw away from the motor, and the output end is connected to the end of the rotating shaft;

The feeding device includes a spray gun support, a spray gun body arranged at the end of the spray gun support, a flow guide pipe connected to the spray gun body and a front end terminal; The slide bar has a chuck B installed on the side wall; the spray gun body is fixed on the chuck B, and the side has a paint nozzle, the paint nozzle is arranged along the horizontal direction, and the central axis coincides with the central axis of the rotating shaft; The guide tube is nested and fitted on the end of the paint nozzle, and the side away from the paint nozzle is fixedly connected to the front end terminal.

Further, the front-end terminal has a one-way channel, mainly including a horizontal section connected to the guide tube and an inclined section away from the end of the guide tube; the lower end of the horizontal section has a through hole, and the side wall of the through hole is inclined , the central axis coincides with the central axis of the inclined section, and a high-pressure airflow nozzle is inserted into the through hole.

Further, the lower end of the inclined section of the front end terminal is connected to a collecting box.

Further, the inclination angle of the inclination section of the front terminal is 0º˜90º.

Further, the front-end terminal has a two-way channel, which mainly includes a main pipe connected to the draft tube and two branch pipes arranged obliquely at the end of the main pipe. The front-end terminal has a Y-shaped section along the vertical direction, and a section inside Y-shaped cavity.

Further, the included angles between the branch pipes are 0º-120º, and they are in the same plane.

Based on a thermal spraying device for inner holes, the present invention discloses a thermal spraying method for inner holes. The innovation point is that the spraying method is specifically as follows:

(1) First, select the pipe fittings to be processed, and perform sandblasting, rust removal and roughening treatment on the inner wall of the pipe fittings;

(2) Next, place one end of the pipe fitting between the chucks A of the rotary clamping device, and lock and fix it, while ensuring that the central axis of the pipe fitting is horizontal;

(3) Turn on the motor to make the lead screw, gear set and rotating shaft work at the same time, so that the spray gun bracket moves to the side of the rotating clamping device along the central axis of the pipe;

(4) When the end of the front terminal is aligned with the end of the pipe away from the clamp A, open the paint nozzle to make the paint particles flow from the front terminal to the side wall of the pipe at a speed of 300-400m/s, and the front terminal moves to the clamp A. At the end of head A, the first layer of spraying is completed;

(5) Finally, use the same method and use the inner hole thermal spraying device to spray the inner wall of the pipe fittings as a primer.

Further, the diameter of the pipe fitting in the step (1) is greater than 0.2m, the feed speed of the lead screw in the step (3) is 2m/min, and the rotational speed of the rotating shaft is 300r/min.

Further, in the step (4), a front terminal with a one-way channel is selected, and the air velocity of the paint nozzle is controlled to be 200-400 m/s, and the air velocity of the high-pressure air nozzle is 400-600 m/s.

Further, in the step (4), a front terminal with a bidirectional channel is selected, and the air velocity of the paint nozzle is controlled to be 600-800 m/s.

The advantages of the present invention are:

(1) The space utilization rate of the paint nozzle of the inner hole thermal spraying device is small, and it can spray the inner wall of the pipe fitting with a small diameter, and the structural design is reasonable; at the same time, the connection is mechanically connected, which can be disassembled freely, with a simple structure and low cost. The problem of spraying on the surface of the inner hole in the existing thermal spraying technology.

(2) There are two types of front-end terminals in the device, one-way channel with one-way channel and two-way channel with two-way channel. The use of both can effectively meet the spraying quality, and the structural design is flexible.

(3) Set a collection box at the lower end of the front terminal with a one-way channel. When the paint is sprayed, part of the paint will fall on the front terminal. Long-term accumulation will affect the normal operation of the device. By adding a collection box, it can Let excess paint fall into it.

(4) The inner hole thermal spraying method can realize continuous spraying or intermittent spraying at a specific position. At the same time, the length of the guide tube can be adjusted according to the length of different workpieces. The short tube can be sprayed on one side, and the long tube can be sprayed on one side. It is divided into two sections, which are sprayed from the holes on both sides. It can spray pipes of different lengths, and adjust the flame of the spray gun, or the pressure and flow rate of high-pressure gas with different diameter pipes, so as to change the flow rate of paint particles and improve the quality of spraying. .

Description of drawings

Fig. 1 is a schematic structural view of Embodiment 1 of an inner hole thermal spraying device of the present invention.

Fig. 2 is a schematic structural view of the feeding device of Embodiment 1 of an inner hole thermal spraying device of the present invention.

Fig. 3 is a schematic structural view of Embodiment 2 of an inner hole thermal spraying device of the present invention.

Fig. 4 is a schematic structural view of the feeding device of Embodiment 2 of an inner hole thermal spraying device of the present invention.

Fig. 5 is a cross-sectional view of the front end terminal of Embodiment 2 of an inner hole thermal spraying device of the present invention.

Detailed ways

Example 1

As shown in FIG. 1 and FIG. 2 , the present invention discloses a thermal spraying device for inner holes, which includes a workbench 1 , a rotary clamping device and a feeding device arranged above the workbench 1 .

The upper end surface of the workbench 1 has a slide rail 2 along the long axis direction, and a motor 3 is installed on the inner side, and the end of the motor 3 is connected with a lead screw 4 arranged along the long axis direction of the workbench 1 .

The rotary clamping device is set on the side away from the motor 3 above the workbench 1, and mainly includes a box body 6, a rotating shaft 9 arranged at the end of the box body 6, and a collet A10; The gear set 5 at the end 8, the input end 7 is connected with the end of the lead screw 4 away from the motor 3, and the output end 8 is connected with the end of the rotating shaft 9.

The feeding device comprises a spray gun support 11, a spray gun body 14 arranged at the end of the spray gun support 11, a flow guide tube 16 connected to the spray gun body 14 and a front end terminal 17; The slide bar 12 that bar 4 is threaded is installed a clamp B13 on the side wall; The central axis coincides; the guide tube 16 is nested and fitted at the end of the paint nozzle 15, and the side away from the paint nozzle 15 is fixedly connected to the front terminal 17; the front terminal 17 has a one-way channel, mainly including the horizontal Section 19 and the inclined section 20 away from the end of the draft tube 16; the lower end of the horizontal section 19 has a through hole 22, the side wall of the through hole 22 is inclined, the central axis coincides with the central axis of the inclined section 20, and the through hole 22 is inserted Cooperate with a high-pressure air nozzle 18; the inclination angle of the inclined section 20 is 0°～90°, and a collecting box 21 is connected to the lower end.

The invention also discloses a thermal spraying method for the inner hole, which is specifically as follows:

(1) First, select the pipe fittings to be processed with a diameter greater than 0.2m, and perform sandblasting, rust removal and roughening treatment on the inner wall of the pipe fittings;

(2) Next, place one end of the pipe fitting between the chucks A10 of the rotary clamping device, and lock and fix it, while ensuring that the central axis of the pipe fitting is horizontal;

(3) Turn on the motor 3 to make the lead screw 4, the gear set 5 and the rotating shaft 9 work at the same time, and set the feed speed of the lead screw 4 to 2m/min, and the rotating speed of the rotating shaft 9 to 300r/min, so that the spray gun bracket 11 can be rotated at 2m/min. The speed of min moves to the side of the rotary clamping device along the central axis of the pipe;

(4) When the end of the front terminal 17 is aligned with the end of the pipe away from the chuck A10, open the paint nozzle 15 and the high-pressure air nozzle 18, and set the air velocity of the paint nozzle 15 to 200-400m/s, and the high-pressure air nozzle 18 The air velocity is 400-600m/s, so that the paint particles flow from the front-end terminal 17 to the side wall of the pipe fitting at a speed of 300-400m/s. When the front-end terminal 17 moves to the end of the chuck A10, the first layer of spraying is completed;

(5) Finally, use the same method and use the inner hole thermal spraying device to spray the inner wall of the pipe fittings as a primer.

Example 2

As shown in FIG. 3 , FIG. 4 and FIG. 5 , the present invention discloses an inner hole thermal spraying device, which includes a workbench 1 , a rotary clamping device and a feeding device arranged above the workbench 1 .

The upper end surface of the workbench 1 has a slide rail 2 along the long axis direction, and a motor 3 is installed on the inner side, and the end of the motor 3 is connected with a lead screw 4 arranged along the long axis direction of the workbench 1 .

The rotary clamping device is set on the side away from the motor 3 above the workbench 1, and mainly includes a box body 6, a rotating shaft 9 arranged at the end of the box body 6, and a collet A10; The gear set 5 at the end 8, the input end 7 is connected with the end of the lead screw 4 away from the motor 3, and the output end 8 is connected with the end of the rotating shaft 9.

The feeding device comprises a spray gun support 11, a spray gun body 14 arranged at the end of the spray gun support 11, a flow guide tube 16 connected to the spray gun body 14 and a front end terminal 17; The slide bar 12 that bar 4 is threaded is installed a clamp B13 on the side wall; The central axis coincides; the guide tube 16 is nested and fitted at the end of the paint nozzle 15, and the side away from the paint nozzle 15 is fixedly connected to the front terminal 17; the front terminal 17 has a two-way channel, mainly including the main pipe 23 connected to the guide tube 16 And two branch pipes 24 obliquely arranged at the end of the main pipe 23, the front end terminal 17 has a Y-shaped cross-section along the vertical direction, and a cavity 25 with a Y-shaped cross-section inside; the angle between the branch pipes 24 is 0°～ 120º, and in the same plane.

The invention also discloses a thermal spraying method for the inner hole, which is specifically as follows:

(1) First, select the pipe fittings to be processed with a diameter greater than 0.2m, and perform sandblasting, rust removal and roughening treatment on the inner wall of the pipe fittings;

(2) Next, place one end of the pipe fitting between the chucks A10 of the rotary clamping device, and lock and fix it, while ensuring that the central axis of the pipe fitting is horizontal;

(3) Turn on the motor 3 to make the lead screw 4, the gear set 5 and the rotating shaft 9 work at the same time, and set the feed speed of the lead screw 4 to 2m/min, and the rotating speed of the rotating shaft 9 to 300r/min, so that the spray gun bracket 11 can be rotated at 2m/min. The speed of min moves to the side of the rotary clamping device along the central axis of the pipe;

(4) When the end of the front-end terminal 17 is aligned with the end of the pipe fitting away from the chuck A10, open the paint nozzle 15, and set the air velocity of the paint nozzle 15 to 600-800m/s, so that the paint particles flow at a speed of 300-400m/s. The speed flows from the front terminal 17 to the side wall of the pipe, and when the front terminal 17 moves to the end of the chuck A10, the first layer of spraying is completed;

(5) Finally, use the same method and use the inner hole thermal spraying device to spray the inner wall of the pipe fittings as a primer.

The basic principles and main features of the present invention have been shown and described above. Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments, and that described in the above-mentioned embodiments and the specification only illustrates the principles of the present invention, and the present invention will also have other functions without departing from the spirit and scope of the present invention. Variations and improvements all fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims (10)

1. A kind of inner hole thermal spraying device, it is characterized in that: comprise workbench, be arranged on the rotary clamping device and feeding device above workbench; The upper end surface of described workbench has a slide rail along the long axis direction, the inner side A motor is installed on the side, and the end of the motor is connected to a lead screw arranged along the long axis of the workbench; the rotary clamping device is arranged on the side away from the motor above the workbench, mainly including a box body, and is arranged at the end of the box body. The rotating shaft and chuck A of the part; a gear set with an input end and an output end is installed in the box, the input end is connected with the end of the screw away from the motor, and the output end is connected with the end of the rotating shaft; the feeding device includes The spray gun bracket, the spray gun body arranged at the end of the spray gun bracket, the flow guide pipe connected with the spray gun body and the front end terminal; Install a chuck B; the spray gun body is fixed on the chuck B, and there is a paint nozzle on the side, the paint nozzle is arranged along the horizontal direction, and the central axis coincides with the central axis of the rotating shaft; the guide tube is nested and fitted At the end of the paint nozzle, the side away from the paint nozzle is fixedly connected to the front end terminal. 2. A thermal spraying device for inner holes according to claim 1, characterized in that: the front end terminal has a one-way channel, mainly including a horizontal section connected to the draft tube and an inclined section away from one end of the draft tube; The lower end of the horizontal section has a through hole, the side wall of the through hole is inclined, and the central axis coincides with the central axis of the inclined section, and a high-pressure air nozzle is inserted into the through hole. 3 . The inner hole thermal spraying device according to claim 2 , wherein the lower end of the inclined section of the front end terminal is connected to a collecting box. 4 . 4 . The inner hole thermal spraying device according to claim 2 , characterized in that: the inclination angle of the inclined section of the front terminal is 0º-90º. 5. A thermal spraying device for inner holes according to claim 1, characterized in that: the front end terminal has a two-way channel, mainly including a main pipe connected to the draft tube and two branch pipes arranged obliquely at the end of the main pipe, The front terminal has a Y-shaped section along the vertical direction, and a cavity with a Y-shaped section inside. 6 . The inner hole thermal spraying device according to claim 5 , wherein the angle between the branch pipes is 0º-120º and they are in the same plane. 7 . 7. A kind of inner hole thermal spraying method based on a kind of inner hole thermal spraying device described in claim 2, it is characterized in that: described spraying method specifically has the following steps: a First, select the pipe fittings to be processed, and perform sandblasting, rust removal and roughening treatment on the inner wall of the pipe fittings; b Next, place one end of the pipe fitting between the chucks A of the rotary clamping device, and lock and fix it, while ensuring that the central axis of the pipe fitting is horizontal; c Turn on the motor to make the lead screw, gear set and rotating shaft work at the same time, so that the spray gun bracket moves to the side of the rotating clamping device along the central axis of the pipe; d When the end of the front-end terminal is aligned with the end of the pipe away from the chuck A, open the paint nozzle, so that the paint particles flow from the front-end terminal to the side wall of the pipe at a speed of 300-400m/s, and the front-end terminal moves to the chuck A At one end, the first layer of spraying is completed; e Finally, use the same method and use the inner hole thermal spraying device to spray the inner wall of the pipe fitting. 8. A kind of inner hole thermal spraying method of a kind of inner hole thermal spraying device according to claim 7, it is characterized in that: the pipe fitting diameter in the described step a is greater than 0.2m, the feeding of the lead screw in the step c The speed is 2m/min, and the rotational speed of the rotating shaft is 300r/min. 9. A kind of inner hole thermal spraying method of a kind of inner hole thermal spraying device according to claim 7, it is characterized in that: in the described step d, select the front terminal with one-way channel, and control the air velocity of paint nozzle The air velocity of the high-pressure air nozzle is 400-600m/s. 10. A kind of inner hole thermal spraying method based on a kind of inner hole thermal spraying device described in claim 5, it is characterized in that: described spraying method specifically has the following steps: a First, select the pipe fittings to be processed, and perform sandblasting, rust removal and roughening treatment on the inner wall of the pipe fittings; b Next, place one end of the pipe fitting between the chucks A of the rotary clamping device, and lock and fix it, while ensuring that the central axis of the pipe fitting is horizontal; c Turn on the motor to make the lead screw, gear set and rotating shaft work at the same time, so that the spray gun bracket moves to the side of the rotating clamping device along the central axis of the pipe; d When the end of the front-end terminal is aligned with the end of the pipe away from the chuck A, open the paint nozzle, so that the paint particles flow from the front-end terminal to the side wall of the pipe at a speed of 300-400m/s, and the front-end terminal moves to the chuck A At one end, the first layer of spraying is completed; in the step d, a front terminal with a two-way channel is selected, and the air velocity of the paint nozzle is controlled to be 600-800m/s; e Finally, use the same method and use the inner hole thermal spraying device to spray the inner wall of the pipe fitting.