Laser cladding powder feeding device for surface strengthening of hydraulic support

Abstract

The invention discloses a laser cladding powder feeding device for strengthening the surface of a hydraulic support in the field of coal mine machinery, the laser cladding powder feeding device comprises a mixing part, a mixing barrel and a powder feeding head, the top of the mixing barrel is provided with a feeding port, and the mixing part comprises a driving mechanism, a horizontal stirring shaft driven by the driving mechanism and a vertical reciprocating stirring shaft; the horizontal stirring shaft and the up-down reciprocating stirring shaft are both located in the mixing barrel, and the powder feeding head is communicated with the bottom of the mixing barrel. According to the scheme, the synergistic effect of horizontal stirring and up-down reciprocating stirring is the key to uniform mixing of cladding materials. The horizontal stirring and the up-down reciprocating stirring are combined to form a three-dimensional mixing effect, and the fluidity of fluid is combined to effectively break material agglomeration, prevent layering and promote uniform distribution of materials, so that the nonuniformity of manual stirring is avoided, the cladding quality and the yield are improved, and the material waste is reduced.

Description

Technical Field

[0001] The invention belongs to the field of coal mine machinery, and in particular relates to a laser cladding powder feeding device for surface strengthening of a hydraulic support. Background Art

[0002] Hydraulic support is one of the main equipment for supporting the coal mining face in underground coal mines. It has important functions such as supporting coal walls, protecting miners and equipment, and controlling coal seam deformation. The performance and life of hydraulic support directly affect the safety and benefits of coal mine production. Therefore, how to improve the performance and life of hydraulic support is an important issue for coal mine safety and production. The normal service life of hydraulic support should be more than one year. The outer cylindrical surface of the column of hydraulic support is easily corroded and worn, which causes failure. If it is repaired due to rust of the oil cylinder, the overhaul cycle is generally half a year, and the maintenance cost is about 30% of the whole machine cost. The traditional electroplating chrome protection effect is not ideal, and it will produce pollutants such as chrome mist, wastewater, and waste residue during the processing, so there are great disadvantages.

[0003] As an advanced surface repair and modification technology, laser cladding technology has the advantages of high efficiency, high precision, and high quality. Laser cladding technology can form a coating with good performance on the surface of the hydraulic support, thereby improving the performance and life of the hydraulic support, resisting the extrusion and impact of the coal wall, thereby reducing the cost and risk of coal mine production, and protecting miners and equipment from damage by the coal wall.

[0004] At present, when laser cladding is performed on certain parts, different materials need to be clad on the surface of the parts to increase the hardness of the parts surface. The existing practice is to put two different cladding materials into a powder feeder for mixing and then convey them to the laser cladding head for laser cladding. However, during the mixing process, due to the use of manual stirring, the mixing uniformity is poor, so the expected effect cannot be achieved, thereby affecting the yield of the parts after laser cladding, and too much mixing is likely to cause waste. Summary of the invention

[0005] The present invention is intended to provide a laser cladding powder feeding device for surface strengthening of a hydraulic support, so as to solve the problem of poor uniformity of mixed cladding materials in the laser cladding powder feeding device in the prior art.

[0006] A laser cladding powder feeding device for surface strengthening of a hydraulic support in this scheme includes a mixing part, a mixing barrel, and a powder feeding head. A feeding port is provided on the top of the mixing barrel. The mixing part includes a driving mechanism, a horizontal stirring shaft and an up and down reciprocating stirring shaft driven by the driving mechanism. The horizontal stirring shaft and the up and down reciprocating stirring shaft are both located in the mixing barrel. The powder feeding head is connected to the bottom of the mixing barrel.

[0007] The working principle of this solution is as follows: In this solution, the synergistic effect of horizontal stirring and reciprocating up-and-down stirring is the key to achieving uniform mixing of the cladding material. The combination of horizontal stirring and reciprocating up-and-down stirring forms a three-dimensional mixing effect. Combining with the fluidity of the fluid, it can effectively break material agglomeration, prevent stratification, and promote the uniform distribution of the material. The mixed material is transported to the laser cladding head through the powder feeding head for cladding.

[0008] The horizontal stirring shaft rotates around the horizontal axis in the mixing barrel, applying shear force and centrifugal force to the material, that is: the rotation of the horizontal stirring shaft drives the material to flow in the horizontal direction, forming eddy currents and shear forces. This shear force can break the agglomeration between material particles and disperse the particles. The centrifugal force generated by the rotation pushes the material towards the side wall of the mixing barrel, and then the material falls back under the action of gravity, forming a circulating flow. This flow helps the uniform distribution of the material in the horizontal direction.

[0009] The reciprocating up-and-down stirring shaft moves up and down vertically in the mixing barrel, applying extrusion force and lifting force to the material, that is: when the reciprocating up-and-down stirring shaft moves downward, it applies a downward pressure to the material, forcing the material to flow towards the bottom of the mixing barrel. This extrusion effect can prevent the material from accumulating at the bottom of the mixing barrel and promote the flow of the material from the bottom to the top. When the reciprocating up-and-down stirring shaft moves upward, it drives the material to flow upward, forming a vertical circulation. This lifting effect can prevent material stratification and ensure the uniform mixing of materials with different densities.

[0010] The beneficial technical effects of this solution are: Through the synergistic effect of the horizontal stirring shaft and the reciprocating up-and-down stirring shaft, efficient and uniform mixing of the cladding material is achieved, avoiding the unevenness of manual stirring, improving the cladding quality and the yield rate, and reducing material waste.

[0011] Furthermore, the driving mechanism includes a worm and gear driving assembly, where the worm gear is connected to a driven sleeve coaxial with it. The driven sleeve is connected to the top of the mixing barrel through a ball bearing. The outer wall of the driven sleeve located inside the mixing barrel is connected to the horizontal stirring shaft. The reciprocating up-and-down stirring shaft is connected to both the worm gear and the driven sleeve through threads, and the reciprocating up-and-down stirring shaft is connected with a limiting member that restricts its horizontal rotation.

[0012] The worm and gear driving mechanism realizes different motion modes of the horizontal stirring shaft and the reciprocating up-and-down stirring shaft through the forward and reverse rotation control of the worm. The horizontal stirring shaft is directly connected to the outer wall of the driven sleeve. When the worm rotates, the worm gear drives the driven sleeve to rotate, thereby driving the horizontal stirring shaft to rotate around the horizontal axis. The movement speed of the horizontal stirring shaft is consistent with the rotation speed of the worm gear, and the movement direction is the same as the rotation direction of the worm. The reciprocating up-and-down stirring shaft is connected to the worm gear and the driven sleeve through threads. When the worm gear rotates, the threads convert the rotational motion into a reciprocating up-and-down motion. The reciprocating up-and-down stirring shaft is restricted from horizontal rotation by the limiting member to ensure that it can only perform reciprocating up-and-down motion.

[0013] By adjusting the forward and reverse speeds and times of the worm, the rotational speed of the horizontal stirring shaft and the movement frequency and stroke of the reciprocating stirring shaft in the up and down directions can be controlled. Furthermore, the fluidity of the material in the vertical direction can be optimized, preventing the material from sinking due to gravity and avoiding the material from accumulating at the bottom of the mixing barrel due to too high viscosity. In addition, the worm and gear drive mechanism has a high transmission ratio and self-locking characteristics, and operates stably and reliably, suitable for long-term continuous operation.

[0014] Furthermore, the limiting member includes a limiting slider fixedly connected to the outer side of the top of the mixing barrel. A chute parallel to the length direction of the reciprocating stirring shaft in the up and down directions is provided on the surface of the reciprocating stirring shaft in the up and down directions, and the limiting slider is slidably connected in the chute. The cooperation between the limiting slider and the chute ensures that the reciprocating stirring shaft in the up and down directions can only perform reciprocating motion in the up and down directions, avoiding horizontal rotation, and further improving the uniformity and stability of stirring.

[0015] Furthermore, a heating layer is provided on the outer wall of the mixing barrel. The heating layer can heat the material in the mixing barrel to evaporate water vapor, which helps to break up the powdered materials in the form of clusters during the stirring process, prevent the material from caking or having poor fluidity due to too low temperature during the mixing process, enable the material to have good flow properties, and ensure the uniform mixing and smooth transportation of the material.

[0016] Furthermore, the upper end of the mixing barrel is connected to a compressed gas source through a gas guide pipe. The compressed gas source transports compressed gas into the mixing barrel through the gas guide pipe to help the material flow in the mixing barrel, prevent the material from accumulating and blocking, and ensure the uniform mixing and smooth transportation of the material.

[0017] Furthermore, the powder feeding head includes a water cooling cavity, a protective layer, and a powder feeding channel arranged from the outside to the inside. The water cooling cavity is connected to a water inlet pipe and a water outlet pipe, and the powder feeding channel is connected to the mixing barrel. The temperature around the laser focus in laser cladding is quite high, and the front end of the powder feeding head is very close to the focus, which causes the temperature of the powder feeding nozzle to rise. When the temperature of the powder feeding nozzle approaches the melting point temperature of the powder, the powder will melt at the powder feeding port, resulting in a gradual decrease in the powder feeding amount of the powder feeding nozzle and finally completely blocking the powder feeding port, seriously affecting the laser cladding processing. Therefore, in this solution, the water cooling cavity is cooled through the water inlet pipe and the water outlet pipe to prevent the powder feeding head from being damaged due to high temperature.

[0018] Furthermore, the powder feeding head is located at the center of the outer side of the bottom of the mixing barrel, and the periphery of the bottom of the mixing barrel is inclined towards the direction of the powder feeding head. The inclined design of the bottom of the mixing barrel helps the material to naturally flow towards the powder feeding head under the action of gravity, reduces the residue of the material in the mixing barrel, improves the material utilization rate, and reduces waste.

[0019] Further, the up-and-down reciprocating stirring shaft includes a threaded section and a stirring section. A spiral auger is provided on the outer wall of the stirring shaft of the stirring section. The threaded section is located at the upper part of the stirring shaft and is in threaded cooperation with the threads in the turbine and the driven sleeve. When the turbine rotates, the threaded section converts the rotational motion into an up-and-down reciprocating motion. The stirring section is located at the lower part of the stirring shaft, and a spiral auger is provided on the outer wall. The spiral auger is a spiral blade that can apply a shearing force and a lifting force to the material.

[0020] Further, a spiral auger is provided on the outer wall of the horizontal stirring shaft. Description of the Drawings

[0021] Figure 1 FIG. is a schematic structural diagram of Embodiment 1 of a laser cladding powder feeding device for surface strengthening of a hydraulic support according to the present invention;

[0022] Figure 2 FIG. is a schematic structural diagram of the mixing part in Embodiment 1 of a laser cladding powder feeding device for surface strengthening of a hydraulic support according to the present invention;

[0023] Figure 3 FIG. is a schematic structural diagram of the combination of the chute and the limit slider on the threaded section of the up-and-down reciprocating stirring shaft in Embodiment 1;

[0024] Figure 4 FIG. is a schematic structural diagram of the powder feeding head in Embodiment 1;

[0025] Figure 5 FIG. is a schematic structural diagram of the powder feeding head in Embodiment 2. Detailed Description of the Invention

[0026] The following is a further detailed description through specific embodiments:

[0027] The reference numerals in the drawings of the specification include: powder feeding head 1, powder feeding channel 101, water cooling cavity 102, protective layer 103, water inlet pipe 104, water outlet pipe 105, mixing barrel 2, mixing part 3, spiral auger 301, horizontal stirring shaft 302, connecting bracket 303, driven sleeve 304, turbine 305, worm 306, limit slider 307, up-and-down reciprocating stirring shaft 308, threaded section 3081, stirring section 3082, chute 3083, heating layer 4, ball bearing 5, connecting rod 6, air guide pipe 7.

[0028] Embodiment 1 is basically as shown in the attached Figure 1 and Figure 2As shown: A laser cladding powder feeding device for surface strengthening of hydraulic supports, including a mixing part 3, a mixing barrel 2, and a powder feeding head 1. The outer wall of the mixing barrel 2 is provided with a constant-temperature heating layer 4, and the heating layer 4 is heated by connecting an electric heating wire to a power supply. The top of the mixing barrel 2 is provided with a feeding port, and a cover body with a number of ventilation holes is connected to the feeding port through a hinge. The mixing part 3 includes a driving mechanism, a horizontal stirring shaft 302, and an up-and-down reciprocating stirring shaft 308. The up-and-down reciprocating stirring shaft 308 includes a threaded section 3081 and a stirring section 3082, and a spiral auger 301 is provided on the outer wall of the stirring section 3082. A spiral auger 301 is also provided on the outer wall of the horizontal stirring shaft 302.

[0029] Both the horizontal stirring shaft 302 and the up-and-down reciprocating stirring shaft 308 are located inside the mixing barrel 2. The driving mechanism includes a turbine 305 and a worm 306 driving assembly. Among them, the turbine 305 is connected to a driven sleeve 304 coaxial with it. The driven sleeve 304 is connected to the top of the mixing barrel 2 through a ball bearing 5. Four horizontal stirring shafts 302 are connected to the outer wall of the driven sleeve 304 inside the mixing barrel 2 through a four-branch connecting bracket 303, and the up-and-down reciprocating stirring shaft 308 is threadedly connected inside the turbine 305.

[0030] Combined Figure 3 As shown, the up-and-down reciprocating stirring shaft 308 is connected with a limiting member that restricts its horizontal rotation. The limiting member includes a limiting slider 307 fixedly connected to the outside of the top of the mixing barrel 2 and connected through a "7"-shaped connecting rod 6. A chute 3083 parallel to its length direction is provided on the surface of the threaded section 3081 of the up-and-down reciprocating stirring shaft 308, and the limiting slider 307 is slidably connected inside the chute 3083.

[0031] Combined Figure 4 As shown, the inside of the powder feeding head 1 is a powder feeding channel 101 that penetrates through its upper and lower ends. The powder feeding head 1 is located at the center of the outside of the bottom of the mixing barrel 2, and the powder feeding channel 101 is communicated with the inside of the mixing barrel 2. The periphery of the bottom of the mixing barrel 2 is inclined towards the direction of the powder feeding head 1.

[0032] Optimally, the upper end of the mixing barrel 2 of this device is communicated with a compressed air source through an air duct 7.

[0033] The specific implementation process is as follows: The turbine 305 and worm 306 drive mechanism realizes different motion modes of the horizontal stirring shaft 302 and the up-and-down reciprocating stirring shaft 308 through the forward and reverse rotation control of the worm 306. The horizontal stirring shaft 302 is directly connected to the outer wall of the driven sleeve 304. When the worm 306 rotates, the turbine 305 drives the driven sleeve 304 to rotate, thereby driving the horizontal stirring shaft 302 to rotate around the horizontal axis. The movement speed of the horizontal stirring shaft 302 is consistent with the rotation speed of the turbine 305, and the movement direction is the same as the rotation direction of the worm 306. The up-and-down reciprocating stirring shaft 308 is connected inside the turbine 305 and the driven sleeve 304 through threads. When the turbine 305 rotates, the threads convert the rotational motion into an up-and-down reciprocating motion. The up-and-down reciprocating stirring shaft 308 is restricted from horizontal rotation by a limiting member to ensure that it can only perform up-and-down reciprocating motion.

[0034] The worm 306 is driven by a motor. When the worm 306 rotates forward, the turbine 305 drives the driven sleeve 304 to rotate, the horizontal stirring shaft 302 rotates clockwise, and the up-and-down reciprocating stirring shaft 308 moves upward. When the worm 306 rotates in reverse, the turbine 305 drives the driven sleeve 304 to rotate in the opposite direction, the horizontal stirring shaft 302 rotates counterclockwise, and the up-and-down reciprocating stirring shaft 308 moves downward. By adjusting the speed and time of the forward and reverse rotation of the worm 306, the rotation speed of the horizontal stirring shaft 302 and the movement frequency and stroke of the up-and-down reciprocating stirring shaft 308 can be controlled. Furthermore, the fluidity of the material in the vertical direction can be optimized, avoiding the sinking of the material due to gravity and the accumulation of the material at the bottom of the mixing barrel 2 due to high viscosity. The combination of horizontal stirring and up-and-down reciprocating stirring forms a three-dimensional mixing effect. Combined with the fluidity of the fluid, it can effectively break the material agglomeration, prevent stratification, and promote the uniform distribution of the material. The mixed material is transported to the laser cladding head through the powder feeding head 1 for cladding. Here, compressed gas is transported into the mixing barrel 2 through the air duct 7 by a compressed air source to help the material flow in the mixing barrel 2, prevent the material from accumulating and blocking, and ensure the uniform mixing and smooth transportation of the material.

[0035] Embodiment 2 is different from Embodiment 1 in that the powder feeding head 1 includes a water-cooling cavity 102, a protective layer 103, and a powder feeding channel 101 arranged from the outside to the inside. The water-cooling cavity 102 is connected to a water inlet pipe 104 at the lower end and a water outlet pipe 105 at the upper end. After the external water source is connected to the water inlet pipe 104, cooling water enters the water-cooling cavity 102 and flows, and is discharged from the water outlet pipe 105. During this process, the powder feeding head 1 is cooled through heat exchange to avoid the front end of the powder feeding head 1 being close to the laser focus during laser cladding and being affected by high temperature resulting in the melting of the material powder.

Claims

1. A laser cladding powder feeding device for surface strengthening of hydraulic support, characterized in that: It includes a mixing part, a mixing barrel, and a powder feeding head. A feeding port is provided on the top of the mixing barrel. The mixing part includes a driving mechanism, a horizontal stirring shaft and an up and down reciprocating stirring shaft driven by the driving mechanism. The horizontal stirring shaft and the up and down reciprocating stirring shaft are both located in the mixing barrel. The powder feeding head is connected to the bottom of the mixing barrel.

2. The laser cladding powder feeding device for surface strengthening of hydraulic support according to claim 1 is characterized in that: The driving mechanism includes a turbine worm drive assembly, wherein the turbine is connected to a driven sleeve coaxial therewith, the driven sleeve is connected to the top of the mixing barrel through a ball bearing, the outer wall of the driven sleeve located in the mixing barrel is connected to the horizontal stirring shaft, the up and down reciprocating stirring shaft is simultaneously connected to the turbine and the driven sleeve through threads, and the up and down reciprocating stirring shaft is connected to a limiter for limiting its horizontal rotation.

3. The laser cladding powder feeding device for surface strengthening of hydraulic support according to claim 2 is characterized in that: The limiting member comprises a limiting sliding block fixedly connected to the outer side of the top of the mixing barrel, and the surface of the vertically reciprocating stirring shaft is provided with a sliding groove parallel to the length direction thereof, and the limiting sliding block is slidably connected in the sliding groove.

4. The laser cladding powder feeding device for surface strengthening of hydraulic support according to claim 3 is characterized in that: The outer wall of the mixing barrel is provided with a heating layer.

5. The laser cladding powder feeding device for surface strengthening of hydraulic support according to claim 4 is characterized in that: The upper end of the mixing barrel is connected to a compressed air source through an air guide pipe.

6. The laser cladding powder feeding device for surface strengthening of hydraulic support according to claim 5 is characterized in that: The powder feeding head comprises a water cooling chamber, a protective layer and a powder feeding channel arranged from outside to inside, the water cooling chamber is connected with a water inlet pipe and a water outlet pipe, and the powder feeding channel is connected with the mixing barrel.

7. A laser cladding powder feeding device for surface strengthening of hydraulic support according to any one of claims 1 to 6, characterized in that: The powder feeding head is located at the center of the outer side of the bottom of the mixing barrel, and the bottom of the mixing barrel is inclined toward the direction of the powder feeding head.

8. A laser cladding powder feeding device for surface strengthening of hydraulic support according to any one of claims 1 to 6, characterized in that: The up-and-down reciprocating stirring shaft comprises a threaded section and a stirring section, and a spiral auger is arranged on the outer wall of the stirring shaft of the stirring section.

9. A laser cladding powder feeding device for surface strengthening of hydraulic support according to any one of claims 1 to 6, characterized in that: The outer wall of the horizontal stirring shaft is provided with a spiral auger.

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