A thermal spraying equipment for rail surface treatment

Abstract

The present invention discloses a thermal spraying device for treating the surface of a steel rail, belonging to the technical field of thermal spraying of steel rails, including a spraying vehicle, wherein a spraying pretreatment mechanism and a spraying shaping mechanism are arranged in the spraying vehicle, wherein the spraying pretreatment mechanism is used for roughening and preheating the steel structure surface, and the spraying shaping mechanism sprays metal materials on the surface of the steel rail and shapes the spraying layer. The present invention forms an inclined gully-like roughening surface on the surface of the steel rail by means of a roughening nozzle in combination with a roughening nozzle, and then improves the firmness of the contact surface by means of a combination of first filling and then thickening between the metal spraying material and the rail surface, and by means of a preheating cleaning pipe in combination with a preheating side pipe, when airflow is blown in, the rotating nozzle is driven to preheat the surface of the steel rail while cleaning the residual sand material, so as to avoid the occurrence of gaps between the contact surface of the steel rail surface and the metal spraying material due to the sand material, which destroys the integrity of the combination, and cyclically preheats the side surface of the I-beam through the automatically changing preheating side pipe, so as to achieve the effect of uniform preheating.

Description

Technical Field

[0001] The invention relates to the technical field of rail thermal spraying, and in particular to a thermal spraying device for treating a rail surface. Background Art

[0002] In rail transit, poor track circuit branching is a global problem that has long plagued driving safety. The track circuit reflects the track occupancy status through the wheel-rail contact relationship between the wheels and the rails, ensuring the control safety of the turnout signal interlocking. In sections with fewer trains, such as railway safety lines and crossing lines, where there are fewer locomotives and vehicles passing through for a long time, the rail surface will produce rust and impurities when it comes into contact with oxygen and rainwater under natural conditions, causing an oxide film (mainly composed of iron dioxide, ferric oxide and ferric oxide) that is a poor conductor, affecting the circuit contact between the wheels and the rails, resulting in the track circuit being unable to correctly reflect the track occupancy status, resulting in signal interlocking control failures, and affecting the normal operation of rail transit.

[0003] At present, when thermal spraying is performed on the rail surface, a metal spray material mainly composed of zinc wire is often sprayed on the rail surface to form a metal coating to inhibit the formation of an oxide film on the rail surface. However, when cleaning and pretreating the rail surface and spraying the rail surface, the existing rail surface thermal spraying equipment directly sprays from the front and rear sides of the rail surface to the same middle part through a sandblasting machine and a spray gun. This spraying method will cause the grinding direction of the sprayed frosted layer and the spraying material to move closer to the center, resulting in airflow interference on the front and rear sides. Combined with the curved rail surface, it is easy to form a spray layer with uneven thickness, which will cause the train to shake during travel, posing a safety hazard.

[0004] At present, most rails are I-shaped. When the rail surface is thermally sprayed directly by the rail surface thermal spraying equipment, the spraying area will not be preheated, resulting in a large temperature difference between the contact surface between the rail surface and the spraying surface, and there will be different degrees of thermal expansion and contraction, resulting in contact gaps, which will reduce the firmness of the bond between the two contact surfaces. In the long run, the sprayed surface will peel and fall off, seriously reducing the bonding strength of the rail surface spray layer. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that the existing rail surface thermal spraying equipment directly thermally sprays the rail surface from the front and rear sides to the middle, resulting in uneven thickness of the sprayed layer, and a large difference in contact surface temperature between the directly thermally sprayed rail surface and the sprayed layer, resulting in different degrees of thermal expansion and contraction, which will reduce the firmness of the bonding between the two contact surfaces. A thermal spraying device for rail surface treatment is proposed to solve the problem that the existing rail surface thermal spraying equipment directly thermally sprays the rail surface from the front and rear sides to the middle, resulting in uneven thickness of the sprayed layer, and a large difference in contact surface temperature between the directly thermally sprayed rail surface and the sprayed layer, resulting in different degrees of thermal expansion and contraction, which will reduce the firmness of the bonding between the two contact surfaces.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A thermal spraying device for treating a rail surface, comprising a spraying vehicle for spraying an I-beam rail surface, wherein a servo motor for power supply and a locomotive wheel set for traveling are arranged in the spraying vehicle, a spraying pretreatment mechanism and a spraying shaping mechanism are arranged in the spraying vehicle, the spraying pretreatment mechanism is used for roughening and preheating the steel structure rail surface to improve the bonding strength between the metal spraying material and the I-beam rail surface, and the spraying pretreatment mechanism is composed of a sandblasting roughening component and a spraying preheating component, and the spraying shaping mechanism is used for spraying metal material onto the rail surface and shaping the spraying layer;

[0008] The sandblasting and texturing assembly comprises a sand storage tank and an air pump arranged on the spraying vehicle, wherein the air pump is connected to a texturing nozzle through a texturing nozzle pipe and is used to spray the sandblasting material in the sand storage tank onto the rail surface, and a sandblasting control valve is arranged in the texturing nozzle;

[0009] The spray preheating assembly includes a preheating tube arranged on the spraying vehicle, a preheating induction coil is arranged in the preheating tube, the preheating tube is blown by a fan, and the preheating tube is composed of a preheating cleaning tube arranged on the top of the I-beam rail surface and a preheating side tube arranged on the side of the I-beam rail surface;

[0010] The spray shaping mechanism includes a spray tank and an air filter pump arranged on a spray vehicle. The air filter pump is connected to a semi-enclosed spray box through a spray pipe. An atomizing nozzle connected to the spray pipe is arranged in the spray box, and a smoothing and shaping slider is fixedly installed inside the spray box.

[0011] Preferably, the texturing nozzles are arranged obliquely and staggered, and a curved drainage duct is fixedly installed at the end of the texturing nozzle, and a sandblasting groove is provided on the inner wall of the drainage duct on the side close to the rail surface.

[0012] Preferably, the curvature of the drainage duct matches the curvature of the rail surface, and the drainage duct is configured to be L-shaped.

[0013] Preferably, the preheating and cleaning pipe is rotatably connected to the bottom of the spraying vehicle, and the outer side of the preheating and cleaning pipe is connected to a rotationally symmetrically arranged rotating nozzle, and the inclination angle of the rotating nozzle is adapted to the setting angle of the sandblasting tank.

[0014] Preferably, the preheating side tube is rotatably arranged at the bottom of the spraying vehicle through a rotating shaft, and is used to preheat the side of the I-beam, and the swing amplitude of the preheating side tube is limited by the rotation limit block on the rotating shaft.

[0015] Preferably, an airflow guide nozzle is rotatably provided at the end of the preheating side pipe, and two direction-changing guide limit slide rails are symmetrically provided at the bottom of the spray vehicle. An electromagnet that is magnetically attracted to the airflow guide nozzle is provided in the direction-changing guide limit slide rail. The airflow guide nozzle is slidably connected to the electromagnet to change the direction of airflow spraying, so that the side of the I-beam is evenly heated.

[0016] Preferably, the atomizing nozzle is tilted, and the tilt angle of the atomizing nozzle is matched with the tilt angle of the sandblasting tank, so as to spray the roughened surface produced by sandblasting with the roughening nozzle. A spraying arc groove matched with the curvature of the I-beam rail surface is provided at the bottom of the atomizing nozzle.

[0017] Preferably, the air filter pump is connected to a cooling chamber arranged in the spray box through a shaping cooling pipe, and one side of the cooling chamber is closed by a smoothing shaping slider.

[0018] Preferably, a shaping detection chamber is provided in the spray box, and an air pressure detector is arranged in the shaping detection chamber.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. By alternately setting the texturing nozzles and texturing nozzles, an inclined grooved textured surface can be formed on the rail surface, so that when the metal spray material is sprayed later, it can first contact with the grooved textured surface and fill it, and then the metal spray layer is thickened. Then, the firmness of the contact surface can be improved by combining the metal spray material and the rail surface with filling and thickening.

[0021] 2. The preheating pipe equipped with a preheating cleaning pipe and a preheating side pipe can drive the rotating nozzle to preheat the rail surface and clean the residual sand when the airflow is blown in, so as to avoid the adhesion of sand and metal spraying materials when spraying metal spraying materials, resulting in gaps in the contact surface between the rail surface and the metal spraying materials due to the sand, thereby destroying the integrity of the combination. The side of the I-beam is cyclically preheated through the automatically changing preheating side pipe to achieve a uniform preheating effect, thereby reducing the temperature difference between the sprayed metal spraying materials and the rail surface, and simultaneously expanding and contracting with heat and cold, thereby improving the bonding strength between the rail surface and the spray layer.

[0022] 3. Through the spray box equipped with an air pressure detector, the air pressure in the shaping test chamber is detected by the air pressure detector to determine whether the metal spray coating is qualified, so as to provide timely feedback to the operator and check the thermal spraying equipment to ensure the uniformity of the spray layer on the rail surface, so as to avoid bumps on the moving train and safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1This is a schematic diagram of the overall structure of a thermal spraying device for rail surface treatment proposed by the present invention;

[0024] Figure 2 This is an overall structural assembly view of a thermal spraying device for rail surface treatment proposed by the present invention;

[0025] Figure 3 This is a perspective structural explosion view of a spray pretreatment mechanism and a spray shaping mechanism of a thermal spraying equipment for rail surface treatment proposed by the present invention;

[0026] Figure 4 For the present invention Figure 3 A magnified view of the structure at center A;

[0027] Figure 5 A schematic diagram of the cross-sectional internal structure of a spray pretreatment mechanism and a spray shaping mechanism of a thermal spraying equipment for rail surface treatment proposed by the present invention;

[0028] Figure 6 The present invention provides a second structural explosion view of a thermal spraying equipment for rail surface treatment, including a spray pretreatment mechanism and a spray shaping mechanism.

[0029] In the figure: 1. Spraying vehicle; 11. Rotating limit block; 12. Direction-changing guide limit slide rail; 2. Sand storage tank; 3. Air pump; 31. Roughening nozzle; 32. Roughening nozzle; 321. Drainage duct; 4. Preheating pipe; 41. Preheating cleaning pipe; 411. Rotating nozzle; 42. Preheating side pipe; 421. Air flow guide nozzle; 5. Spraying tank; 6. Air filter pump; 61. Spraying pipe; 62. Spraying box; 63. Atomizing nozzle; 64. Smoothing and shaping slider; 65. Cooling chamber; 7. Shaping and cooling pipe. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] Example, see Figures 1 to 6 A thermal spraying device for rail surface treatment includes a spraying vehicle 1 for spraying the surface of an I-beam rail. The spraying vehicle 1 is provided with a servo motor for power supply and a locomotive wheel set for walking. The spraying vehicle 1 is provided with a spraying pretreatment mechanism and a spraying shaping mechanism. The spraying pretreatment mechanism is used for roughening and preheating the steel structure rail surface to improve the bonding strength between the metal spraying material and the I-beam rail surface, and the spraying pretreatment mechanism is composed of a sandblasting roughening component and a spraying preheating component. The spraying shaping mechanism is used for spraying metal material onto the rail surface and shaping the spray layer.

[0034] It should be noted that the I-rails that need to be sprayed with metal materials are rails in service. By starting the servo motor, the locomotive wheels can be driven to rotate, so that the spraying vehicle 1 moves along the surface of the rails, thereby pretreating and spraying the parallel rails at the same time through the spray pretreatment mechanism and the spray shaping mechanism. This is an existing power supply technology and will not be repeated in the following.

[0035] like Figure 1 and Figure 2 As shown, the sandblasting texturing component includes a sand storage tank 2 and an air pump 3 arranged on a spraying vehicle 1. The air pump 3 is connected to a texturing nozzle 32 through a texturing nozzle 31, and is used to spray the sandblasting abrasive in the sand storage tank 2 onto the rail surface. A sandblasting control valve is arranged in the texturing nozzle 32.

[0036] It should be noted that: during the movement of the spraying vehicle 1, the sandblasting control valve is turned on, and air is pumped into the roughening nozzle 31 through the air pump 3, driving the sand material to be sprayed on the rail surface, and roughening the rail surface, so as to improve the bonding strength between the two when the metal spray material is subsequently sprayed;

[0037] Furthermore, the texturing nozzles 32 are arranged in an inclined and staggered manner, and a curved drainage conduit 321 is fixedly installed at the end of the texturing nozzle 32. A sandblasting groove is provided on the inner wall of the drainage conduit 321 close to the rail surface, and the sandblasting groove is arranged in an inclined manner, such as Figure 6 As shown in , the direction is the direction of the spraying vehicle 1, so that when the sand material flows along the drainage duct 321 with the air flow, a groove-like roughening surface can be formed on the rail surface. The curvature of the drainage duct 321 is adapted to the curvature of the rail surface, and the drainage duct 321 is set in an L shape, so that the sand material can be extended along the top of the rail surface, so as to avoid the weak sandblasting force at the top of the rail surface, reduce the roughening degree, and reduce the firmness of the combination between the rail surface and the metal spray material;

[0038] It should be noted that the alternately arranged texturing nozzles 32 can texturize the rail surface from different wind directions, and limit the sandblasting range of the sand material through the drainage duct 321, so as to ensure that most of the sand material can participate in the texturizing operation of the rail surface during the spraying process, and the sandblasting groove opened by the drainage duct 321 allows the sand material to form a grooved texturizing surface along the air flow direction during the guiding process, so that when the metal spray material is subsequently sprayed, it can first contact with the grooved texturizing surface and fill it, and then the metal spray layer is thickened, so that the firmness of the contact surface can be improved by the combination of first filling and then thickening between the metal spray material and the rail surface.

[0039] like Figure 1 As shown, the spray preheating assembly includes a preheating tube 4 arranged on the spraying vehicle 1, a preheating induction coil is arranged in the preheating tube 4, and the preheating tube 4 is blown by a fan. The preheating tube 4 is composed of a preheating cleaning tube 41 arranged on the top of the I-beam rail surface and a preheating side tube 42 arranged on the side of the I-beam rail surface;

[0040] It should be noted that: when the air blown by the fan passes through the preheating pipe 4, the air is heated by turning on the preheating induction coil, so that the air blown out of the air outlet of the preheating pipe 4 can heat the rail surface, complete the cleaning operation of the residual sand material and the rail surface heating preheating operation, and avoid directly spraying metal spray on the roughened rail surface. The temperature difference between the two is large, and a contact gap appears when combined, which reduces the firmness of the thermal spraying combination;

[0041] Furthermore, the preheating and cleaning pipe 41 is rotatably connected to the bottom of the spraying vehicle 1, and the outer side of the preheating and cleaning pipe 41 is connected to a rotationally symmetrically arranged rotating nozzle 411, and the inclination angle of the rotating nozzle 411 is adapted to the setting angle of the sandblasting tank;

[0042] It should be noted that: when the airflow blown into the preheating cleaning pipe 41 passes through the rotating nozzle 411, the rotating nozzle 411 set obliquely can be rotated to drive the rotating nozzle 411 to rotate along the axis of the preheating cleaning pipe 41 through the reverse force of the airflow, thereby generating a cleaning airflow blowing toward the rail surface, and preheating the roughened part, and then cleaning the rail surface while preheating it, so as to avoid the adhesion of sand material and metal spraying material when spraying metal spraying material, resulting in a gap between the contact surface of the rail surface and the metal spraying material due to the sand material, thereby destroying the integrity of the combination;

[0043] Furthermore, the preheating side pipe 42 is rotatably arranged at the bottom of the spraying vehicle 1 through a rotating shaft, and is used to preheat the side of the I-beam, and the swing amplitude of the preheating side pipe 42 is limited by the rotation limit block 11 to limit the rotation of the rotating shaft;

[0044] It should be noted that: the rotating shaft adopts a resistance rotating shaft to maintain the direction of the pipe opening of the preheating side pipe 42 under the reaction force generated by the airflow. When the preheating side pipe 42 preheats the side of the I-beam, the airflow flows to generate a reaction force that causes the airflow guide nozzle 421 to move in the opposite direction, thereby intermittently cyclically preheating the side of the I-beam to complete the preheating operation of the I-beam. During this period, the rotating shaft of the preheating side pipe 42 is rotationally limited by the rotating limit block 11 to avoid excessive rotation, so as to blow the airflow away from the preheating heating surface of the I-beam and reduce the preheating effect.

[0045] Based on the above, the end of the preheating side pipe 42 is rotatably provided with an airflow guide nozzle 421, and two direction-changing guide limit slide rails 12 are symmetrically provided at the bottom of the spraying vehicle 1. An electromagnet that is magnetically attracted to the airflow guide nozzle 421 is provided in the direction-changing guide limit slide rail 12. The airflow guide nozzle 421 is slidably connected with the electromagnet to change the direction of the airflow spraying, so that the side of the I-beam is evenly heated;

[0046] The further advantage of adopting the above method is that the preheating side pipe 42 is divided into a fixed part connected to the preheating pipe 4 and a rotatable part rotatably connected to the airflow guide nozzle 421. The airflow guide nozzle 421 is initially attracted by the magnetic force of the direction-changing guide limit slide rail 12 to limit the initial airflow direction to be inclined downward. When the airflow is introduced into the preheating side pipe 42 at the fixed part, the reaction force of the airflow is used to make the preheating side pipe 42 at the rotatable part generate an upward swinging force and swing upward. Then, when the preheating side pipe 42 moves upward to the upper direction-changing guide limit slide rail 12, the airflow is guided by the magnet. The direction of the nozzle 421 is modified to the opposite direction, thereby generating an airflow direction opposite to the initial airflow direction, and then the airflow guide nozzle 421 generates a downward propulsion force, so that the preheating side tube 42 at the rotatable part generates a downward swinging force and swings downward until it changes direction again through the lower change-direction guide limit slide rail 12, completing the swinging and changing direction operation of the preheating side tube 42 at the rotatable part, and cyclically preheating the side surface of the I-beam to achieve a uniform preheating effect, thereby reducing the temperature difference between the sprayed metal spray and the rail surface, and performing thermal expansion and contraction simultaneously, thereby improving the bonding strength between the two.

[0047] like Figure 5 and Figure 6 As shown, the spraying and shaping mechanism includes a spray tank 5 and an air filter pump 6 arranged on the spray vehicle 1. The air filter pump 6 is connected to a semi-enclosed spray box 62 through a spray pipe 61. An atomizing nozzle 63 connected to the spray pipe 61 is arranged in the spray box 62, and a smoothing and shaping slider 64 is fixedly installed inside the spray box 62.

[0048] It should be noted that: after the residual sandblasting cleaning and preheating of the rail surface, the air filter pump 6 is started, and the metal spray material in the molten state is injected into the spray pipe 61 through the spray tank 5 and sprayed on the roughened part of the rail surface, and after the spraying is completed, the spray layer with thicker parts or bubble layers is smoothed by the smoothing and shaping slider 64, and its thickness is limited to ensure that the thickness of the metal spray layer is not thicker than the interval between the smoothing and shaping slider 64 and the rail surface;

[0049] Furthermore, the atomizing nozzle 63 is tilted, and the tilt angle of the atomizing nozzle 63 is matched with the tilt angle of the sandblasting slot, so as to spray the roughened surface produced by the roughening nozzle 32 after sandblasting. A spraying arc groove matched with the curvature of the I-beam rail surface is provided at the bottom of the atomizing nozzle 63, so that the air pressure sprayed on the rail surface can be the same, and the spraying speed of the metal spray material sprayed on the rail surface at various locations is the same, so that the metal spray material is evenly sprayed on the rail surface, achieving a uniform spraying effect;

[0050] Based on the above, the air filter pump 6 is connected to a cooling chamber 65 arranged in the spray box 62 through a shaping cooling pipe 7, and one side of the cooling chamber 65 is closed by a smoothing shaping slider 64. A shaping detection chamber is opened in the spray box 62, and an air pressure detector is arranged in the shaping detection chamber;

[0051] It should be noted that the air filter pump 6 supplies air to the shaping cooling pipe 7 and the atomizing nozzle 63 in the spray pipe 61, and the two do not interfere with each other. This pipeline connection and control is a prior art and will not be described in detail in the following.

[0052] Based on the above, if Figure 2 As shown, the air blown into the cooling chamber 65 through the shaping cooling pipe 7 can accelerate the cooling speed of the metal spray layer, and the air flow direction is restricted by the smoothing shaping slider 64 so that the air flows through the shaping detection chamber, so that the air pressure in the shaping detection chamber can be detected by the air pressure detector to determine whether it is maintained within the specified range, and whether the metal spray layer is sprayed qualified;

[0053] Based on the above, the specific judgment basis of the air pressure detector to determine whether the metal spray coating is qualified is as follows: when the surface of the spray coating is thin or there are pores formed by bubbles, the air flow escape path is increased, thereby reducing the air pressure detected by the air pressure detector, making its air pressure value lower. When it is lower than the specified air pressure range, it means that the metal spray coating is unqualified at this time. After the coating passes through the smoothing and shaping slider 64, the interval between the metal spray coating and the outlet of the shaping detection cavity remains constant after smoothing, that is, the air pressure fluctuation detected by the air pressure detector remains stable. At this time, the surface metal spray coating is qualified, so it can be judged whether the metal spray coating is qualified, ensuring the uniformity of the rail surface spray coating, and will not cause bumps to the moving train and cause safety accidents.

[0054] Working principle:

[0055] When the metal thermal spraying is performed on the rail surface of the present invention, the treatment process of the rail surface will sequentially go through a sandblasting roughening process, a roughening part cleaning and preheating process and a metal spraying process, wherein the sandblasting roughening process of the rail surface is as follows: the air pump 3 is started to spray the sandblasting abrasive material onto the rail surface through the roughening nozzle 32, during which the alternately arranged roughening nozzles 32 can prevent the sandblasting airflows from canceling each other out, thereby reducing the roughening sandblasting force on the rail surface arc top, and the L-shaped drainage duct 321 arranged at the roughening nozzle 32 and its end can limit the sandblasting roughening path, forming a roughening path along the roughening nozzle 32. Figure 6 The grooved roughened surface in the direction of the sandblasting groove is shown so that when the metal spray material is subsequently sprayed, it will first contact with the grooved roughened surface and fill it, and then the metal spray layer will be thickened. In this way, the firmness of the contact surface can be improved by the combination of first filling and then thickening between the metal spray material and the rail surface.

[0056] Based on the above, the cleaning and preheating process of the roughened part of the rail surface is as follows: start the fan to blow air to the preheating pipe 4, and heat the air flow when it passes through the preheating induction coil. The preheating induction coil is set on Figure 1 At the air inlet of the middle preheating pipe 4, the airflow blowing toward the rail surface is a high-temperature airflow, so that the rail surface arc top and the connection part between the rail surface and the bottom of the I-beam are preheated respectively through the preheating cleaning pipe 41 and the preheating side pipe 42, thereby reducing the temperature difference between the metal spray and the rail surface and improving the firmness of the thermal spraying bonding;

[0057] Based on the above, the high-temperature airflow in the preheating and cleaning pipe 41 preheats the rail arc top through the rotating nozzle 411, and drives the rotating nozzle 411 to rotate to remove the sand material remaining on the grooved roughened surface, so as to avoid the formation of gaps due to the sand material blocking the combination of the two, thereby destroying the integrity of the combination;

[0058] Based on the above, the preheating side pipe 42 is divided into a fixed part connected to the preheating pipe 4 and a rotatable part rotatably connected to the airflow guide nozzle 421. When the high-temperature airflow in the preheating side pipe 42 preheats the arc top of the rail surface through the airflow guide nozzle 421, a propulsion force opposite to the airflow direction is generated on the airflow guide nozzle 421, and the rotation angle of the rotation axis of the preheating side pipe 42 of the rotatable part is limited in combination with the rotation limit blocks 11 arranged above and below to prevent excessive rotation, so as to blow the airflow away from the I-beam preheating area. The hot surface is reduced, the preheating effect is reduced, and the electromagnets in the upper and lower direction-changing guide limit slide rails 12 attract the airflow guide nozzles 421 that are attached to the surface, change the direction of the airflow guide nozzles 421, change the direction of the airflow gushing, and generate an up and down swinging propulsion force for the preheating side pipes 42 of the rotatable part, thereby cyclically heating the side of the I-beam to achieve a uniform preheating effect, thereby reducing the temperature difference between the sprayed metal spray and the rail surface, and performing thermal expansion and contraction synchronously, thereby improving the bonding strength between the two;

[0059] Further based on the above, during the period when the airflow guide nozzle 421 changes the direction of the airflow, the resistance shaft arranged between the airflow guide nozzle 421 and the preheating side tube 42 can ensure that the rotatable part of the preheating side tube 42 maintains the original direction of the airflow until it reaches the rotation limit block 11 and is limited. The electromagnet in the direction-changing guide limit slide rail 12 generates suction on the airflow guide nozzle 421, thereby making it possible to conveniently change the direction of the airflow guide nozzle 421.

[0060] Based on the above, the metal spraying process for the rail surface is as follows: start the air filter pump 6, and inject the molten metal spray into the spray pipe 61 through the spray tank 5, and spray it on the roughened part of the rail surface through the atomizing nozzle 63, and then smooth the spray layer in the thicker sprayed part or the bubble layer through the smoothing and shaping slider 64 to ensure that the thickness of the metal spray layer is not thicker than the interval between the smoothing and shaping slider 64 and the rail surface;

[0061] Based on the above, the air injected into the cooling chamber 65 through the shaping cooling pipe 7 can accelerate the cooling speed of the metal spray layer, and the air flow direction is restricted by the smoothing shaping slider 64 so that it flows through the shaping detection chamber. Figure 5 The chamber in the middle cooling chamber 65 which is far from the side of the smoothing and shaping slider 64 can detect whether the air pressure in the shaping detection chamber is maintained within a specified range through an air pressure detector to determine whether the metal spray coating is qualified;

[0062] Based on the above, the specific judgment basis of the air pressure detector to determine whether the metal spray coating is qualified is as follows: when the surface of the spray coating is thin or there are pores formed by bubbles, the air flow escape path is increased, thereby reducing the air pressure detected by the air pressure detector, making its air pressure value low. When it is lower than the specified air pressure range, it means that the metal spray coating is unqualified at this time. After the coating passes through the smoothing and shaping slider 64, the interval between the metal spray coating and the outlet of the shaping detection cavity remains constant after smoothing, that is, the air pressure fluctuation detected by the air pressure detector remains stable. At this time, the surface metal spray coating is qualified, so it can be judged whether the metal spray coating is qualified.

[0063] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A thermal spraying device for rail surface treatment, comprising a spraying vehicle (1) for spraying the surface of an I-beam rail, wherein a servo motor for power supply and a locomotive wheel set for traveling are arranged in the spraying vehicle (1), characterized in that: The spraying vehicle (1) is provided with a spraying pretreatment mechanism and a spraying shaping mechanism, wherein the spraying pretreatment mechanism is used to roughen and preheat the steel rail surface to improve the bonding strength between the metal spraying material and the I-beam rail surface, and the spraying pretreatment mechanism is composed of a sandblasting roughening component and a spraying preheating component, and the spraying shaping mechanism is used to spray the metal material onto the rail surface and shape the spray layer; The sandblasting texturing component comprises a sand storage tank (2) and an air pump (3) arranged on a spraying vehicle (1); the air pump (3) is connected to a texturing nozzle (32) via a texturing nozzle (31) and is used to spray the sandblasting abrasive in the sand storage tank (2) onto the rail surface; the texturing nozzle (32) is provided with a sandblasting control valve; The texturing nozzles (32) are arranged obliquely and staggered, and a curved drainage conduit (321) is fixedly mounted at the end of the texturing nozzle (32), a sandblasting groove is provided on the inner wall of the drainage conduit (321) close to the rail surface, the curvature of the drainage conduit (321) is adapted to the curvature of the rail surface, and the drainage conduit (321) is arranged in an L shape; The spray preheating assembly comprises a preheating pipe (4) arranged on the spraying vehicle (1), a preheating induction coil is arranged in the preheating pipe (4), the preheating pipe (4) is blown by a fan, and the preheating pipe (4) is composed of a preheating cleaning pipe (41) arranged on the top of the I-beam rail surface and a preheating side pipe (42) arranged on the side of the I-beam rail surface; The preheating side pipe (42) is rotatably arranged at the bottom of the spraying vehicle (1) via a rotating shaft, and is used to preheat the side surface of the I-beam. The swing amplitude of the preheating side pipe (42) is limited by the rotation limit block (11) of the rotating shaft. An airflow guide nozzle (421) is rotatably arranged at the end of the preheating side pipe (42). Two direction-changing guide limit slide rails (12) are symmetrically arranged at the bottom of the spraying vehicle (1). An electromagnet that is magnetically attracted to the airflow guide nozzle (421) is arranged in the direction-changing guide limit slide rail (12). The airflow guide nozzle (421) changes the direction of airflow spraying by being slidably connected to the electromagnet, so that the side surface of the I-beam is evenly heated. The spraying and shaping mechanism comprises a spray tank (5) and an air filter pump (6) arranged on a spraying vehicle (1); the air filter pump (6) is connected to a semi-enclosed spray box (62) through a spray pipe (61); an atomizing nozzle (63) connected to the spray pipe (61) is arranged inside the spray box (62); and a smoothing and shaping slider (64) is fixedly installed inside the spray box (62).

2. The thermal spraying equipment for rail surface treatment according to claim 1, characterized in that: The preheating and cleaning pipe (41) is rotatably connected to the bottom of the spraying vehicle (1), and the outer side of the preheating and cleaning pipe (41) is connected to a rotationally symmetrically arranged rotating nozzle (411), and the inclination angle of the rotating nozzle (411) is adapted to the setting angle of the sandblasting tank.

3. The thermal spraying equipment for rail surface treatment according to claim 1, characterized in that: The atomizing nozzle (63) is arranged tilted, and the tilt angle of the atomizing nozzle (63) matches the tilt angle of the sandblasting slot, so as to spray the roughened surface produced by the sandblasting of the roughening nozzle (32). The bottom of the atomizing nozzle (63) is provided with a spraying arc groove that matches the arc of the I-beam rail surface.

4. The thermal spraying equipment for rail surface treatment according to claim 1, characterized in that: The air filter pump (6) is connected to a cooling chamber (65) disposed in the spray box (62) via a shaping cooling pipe (7), and one side of the cooling chamber (65) is closed by a smoothing shaping slider (64).

5. The thermal spraying equipment for rail surface treatment according to claim 4, characterized in that: A shaping detection chamber is provided in the spray box (62) at a side away from the cooling chamber (65), and an air pressure detector is provided in the shaping detection chamber.

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