Titanium sponge crushing system and method

Abstract

The invention discloses a titanium sponge crushing system. The system comprises four stages of crushing systems, the crusher is a double-roller shearing type crusher; the first-stage vibrating screen, the second-stage vibrating screen and the third-stage vibrating screen are linear vibrating double-layer screens, upper-layer screens and lower-layer screens of the first-stage vibrating screen and the third-stage vibrating screen are round hole screens, the hole diameters of screen plates of the upper-layer screens are 70 mm, 50 mm and 20-35 mm respectively, and the hole diameters of screen plates of the lower-layer screens are 17 mm The system further comprises a middle vibrating feeder, the adjacent crushing systems are connected through the vibrating feeder and a large-dip-angle belt conveyor, and the middle vibrating feeder conveys materials between the upper screen plate and the lower screen plate of the upper-stage vibrating screen and oversize materials of the lower-stage vibrating screen to a stock bin of the lower-stage crushing system. And undersize products of the vibrating screens of all stages of crushing systems are conveyed through the finished product belt. According to the titanium sponge crushing system, the weight ratio of crushed titanium sponge particles with the size smaller than 12.7 mm in the obtained crushed titanium sponge particles is greatly increased, and the quality of titanium alloy prepared from titanium sponge products is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of titanium alloy preparation, in particular to a titanium sponge crushing system and method. Background Art

[0002] When sponge titanium is produced by magnesium thermal reduction, the impurity elements in various parts of the sponge titanium mass produced by the reaction tank are unevenly distributed, resulting in different local quality. In order to ensure the uniform texture of the subsequent manufacturing of titanium alloys and their profiles, the sponge titanium mass needs to be crushed into small particles and stirred evenly, and then melted into ingots in a vacuum consumable furnace for subsequent processing. The quality of the crushed titanium sponge particles is an important factor affecting the manufacture of titanium alloys. Therefore, the apparent quality of the sponge titanium crushed particles should be good and the particle size should be uniform; during crushing, its sponge-like structure should be avoided from being destroyed to prevent oxidation and nitridation. International standards stipulate that the particle size of the sponge titanium crushed particles prepared by magnesium thermal reduction method should be controlled between 0.83 and 25.4 mm.

[0003] At present, the sponge titanium lumps produced by the domestic magnesium thermal reduction method are generally sliced ​​by a slicer, then crushed by a roller shear crusher and screened by a linear vibrating screen. After being crushed to a suitable particle size, the qualified products are packed in barrels after processes such as color sorting by a color sorter and manual sorting on a static table. In this process, there are certain differences in the relevant parameters such as the number of crushing times and screening times of the crusher among various companies. This difference is one of the important reasons for the differences in the quality of sponge titanium among various companies. Although domestic companies have adopted various methods to improve the quality of sponge titanium crushed particles, there is still a problem that the coarse particles obtained by the crushing and screening lines account for a high proportion of the sponge titanium crushed particles, and the particles with a size less than 12.7 mm account for only 20% to 29% of the weight.

[0004] Chinese patent CN 115155773 B discloses a titanium sponge crushing system, characterized in that it comprises a pre-treatment system, a five-stage crushing system and a post-treatment system connected in sequence, the crushers in each stage of the crushing system are all double-roll shear crushers, the double-roll shear crushers comprise two rollers spaced apart from each other and shear blades respectively fixed on each roller, the shear blade thickness of the crushers in each stage of the crushing system is different, and the shear blade thickness of the crushers in each stage of the crushing system decreases with the increase of the number of stages, the shear blade thickness ratio of the crushers in the first stage of the crushing system, the second stage of the crushing system and the third stage of the crushing system is 3.0-3.5:2.0-2.5:1, wherein the shear blade thickness of the crusher in the third stage of the crushing system is 20mm-30mm, the shear blade thickness ratio of the crushers in the fourth stage of the crushing system and the fifth stage of the crushing system is 1.0-1.5:1, and the shear blade thickness of the crusher in the fifth stage of the crushing system is 8mm-12mm. This patent improves the problems of large extrusion deformation of titanium sponge and rapid heating of titanium sponge during single crushing by setting up a multi-stage crushing system and the thickness of the shear blades of each series of crushers. It does not involve increasing the weight proportion of particles less than 12.7mm. Summary of the invention

[0005] The object of the present invention is to provide a sponge titanium crushing system, which is divided into four levels. The 1-4 level crushers all adopt double-roller shearing crushers, corresponding to the 1-3 level linear vibrating double-layer screens, the upper and lower screens all adopt round hole screens, the apertures of the upper screen plate are 70mm, 50mm, 20~35mm respectively, and the apertures of the lower screen plate are 17mm.

[0006] The 1-3 level linear vibrating screen screens divide the materials into three parts: the material on the screen is transported to the vibrating feeder at the next step of the upper lower chute through the down chute, and is transported to the crusher silo of the current level together with the material of the previous particle size for further crushing; the material between the upper and lower screen plates, that is, the middle material, is transported to the vibrating feeder at the next level through the down chute, and transported to the crusher silo of the next level for crushing and screening with a smaller particle size; the material under the double-layer screen is the qualified particle size material, which is transported to the finished product belt through the down chute, which can increase the weight proportion of sponge titanium crushed particles with a size less than 12.7 mm.

[0007] In order to achieve the above-mentioned purpose, the present invention provides a titanium sponge crushing system, including a 4-stage crushing system; wherein: The crushing system at each level includes a silo, a vibrating feeder, a crusher, and a vibrating screen; the crusher is a roller shearing crusher; the vibrating screens at levels 1-3 are all linear vibrating double-layer screens, and the upper and lower screens are both round-hole screens, the apertures of the upper screen plates are 70mm, 50mm, and 20-35mm respectively, and the apertures of the lower screen plates are all 17mm; It also includes an intermediate vibrating feeder, through which the adjacent crushing systems are connected, and the intermediate vibrating feeder conveys the materials between the upper and lower screen plates of the upper vibrating screen and the screened materials of the lower vibrating screen to the silo of the lower crushing system; It also comprises a finished product belt, through which the undersize of the vibrating screen of each level of the crushing system is transported.

[0008] In the crushing system of the present invention, the 1-3 linear vibrating double-layer screen screens divide the screened materials into three parts: the screened materials are transported to the upper-level lower chute through the lower chute and transported to the intermediate vibrating feeder, and are transported together with the upper-level intermediate materials through the belt conveyor system to the current-level crusher bin for crushing again; the materials between the upper and lower screen plates, that is, the intermediate materials, are transported to the lower-level intermediate vibrating feeder through the lower chute, and are transported to the lower-level crusher bin through the lower-level belt conveyor system for crushing and screening in a crusher with a smaller particle size; the materials under the double-layer screen are qualified particle size materials, which are transported to the finished product belt through the lower chute for subsequent disc screen screening of various particle size grades.

[0009] In the present invention, the belt conveyor system of each level of the crushing system adopts a large-angle belt conveyor system. By setting the crushing times, screening times, screening device parameters, etc. of the above crusher, the weight proportion of the sponge titanium crushed particles with a size less than 12.7 mm obtained on the finished belt is increased.

[0010] According to a titanium sponge crushing system described in the present invention, preferably, the vibrating screen of the four-stage crushing system is a single-layer vibrating square hole screen, and the side length of the screen plate holes is 17 mm.

[0011] According to the titanium sponge crushing system described in the present invention, preferably, the crusher tooth thicknesses of the 1-4 level crushing systems are: 60mm, 35mm, 15mm-18mm, 10mm-12mm respectively. The use of the crusher tooth thickness of the above thickness can better increase the weight proportion of titanium sponge crushed particles with a size less than 12.7mm, and further improve the crushing quality of titanium sponge.

[0012] According to the titanium sponge crushing system described in the present invention, preferably, a material unloading speed control system of the first-level crushing system is also provided, and the material unloading speed control system includes a weighing belt conveyor and a main controller. The weighing belt conveyor is used to weigh the material output by the vibrating feeder and then convey it to the crusher below. The weighing belt conveyor is used to calculate the unloading speed per unit time and send it to the main controller. The main controller is connected to and controls the vibration frequency of the vibrating feeder, thereby controlling the unloading speed of the first-level crushing system.

[0013] The crushing system of the present invention is mainly suitable for sponge titanium lumps prepared by magnesium thermal reduction method. The sponge titanium lumps produced by this method show compression resistance in mechanical crushing. A large amount of heat is easily generated during the crushing process. When the temperature of the sponge titanium reaches a certain level, it is easy to come into contact with the air to cause oxidation and nitridation, causing local quality degradation of the crushed sponge titanium particles. After the crushed sponge titanium particles are densely compacted, they are smelted into ingots by equipment such as vacuum consumable furnaces for the manufacture of titanium alloys. In the early crushing process, oxygen and nitrogen impurity elements are introduced, which seriously affects the mechanical and corrosion resistance properties of the titanium alloys produced subsequently. This will bring great hidden dangers to the subsequent application of alloy titanium plates, titanium pipe fittings and other profiles in the fields of national defense, chemical industry, energy, ocean and medical care. Therefore, it is an important task to effectively monitor the temperature changes of sponge titanium lumps during the crushing process.

[0014] The material discharging speed control system of the first-level crushing system provided by the present invention adjusts the material discharging speed by controlling the vibration frequency of the vibrating feeder, and is linked with the weighing belt conveyor to realize effective control of the material discharging speed through the weighing belt conveyor. The weighing belt conveyor controls the vibration frequency of the vibrating feeder according to the calculated material discharging speed to realize accurate control of the material discharging speed.

[0015] According to the titanium sponge crushing system described in the present invention, preferably, a vibrator is provided on the outer silo wall of the silo of the first-level crushing system. The size of the titanium sponge slices in the silo meets the feeding size requirements of the subsequent titanium sponge crusher, and the vibrator is provided on the outer silo wall to vibrate the material when the material is not discharged smoothly.

[0016] According to the titanium sponge crushing system of the present invention, preferably, each level of the vibrating screen is provided with a video monitoring device, including a monitor, and the monitor is connected to a monitoring control system. When the monitor corresponding to the monitoring control system finds that the vibrating screen surface is blocked to a certain extent, the monitoring personnel are notified through the monitoring control system to clean the vibrating screen surface to ensure the vibrating screen screening efficiency, avoid secondary crushing of qualified particle size materials, and effectively reduce the packaging density of the titanium sponge finished material.

[0017] According to a titanium sponge crushing system described in the present invention, preferably, each level of crushers is provided with a cutter tooth temperature control device, the device comprises an infrared thermometer, a cutter tooth cooling device and a temperature control system thereof; the infrared thermometer is used to measure the temperature of the corresponding cutter teeth, the cutter tooth cooling device is used to cool the corresponding cutter teeth, and the temperature control system is respectively connected to the infrared thermometer and the frequency conversion controller of the cutter tooth cooling device.

[0018] In the prior art, there are thermocouple method, infrared radiation detection method and calorimetric measurement method for measuring temperature changes, among which thermocouple method and infrared radiation detection method are the main measurement methods. The thermocouple method is based on the thermoelectric effect, and uses the thermocouple to directly contact the target to measure the temperature, which can reflect its temperature value. Its measurement methods can be divided into natural and embedded methods. The infrared radiation detection method often uses an infrared thermal imager to scan the surface of the object to be measured, and forms a two-dimensional distribution image of its temperature after analysis. The infrared thermal imager has a low signal-to-noise ratio, and the chips formed during cutting can easily affect its temperature measurement, but it has the advantages of good sensitivity and rapid measurement, especially the non-contact method is more convenient for temperature measurement, and has good practicality for sponge titanium shear crushing.

[0019] In the present invention, the blade cooling device may be a cooling device with a variable frequency controller, such as a blower.

[0020] In a specific embodiment of the present invention, the blade cooling device is linked with the temperature infrared temperature measuring point to achieve effective control of the crusher blade temperature.

[0021] According to the titanium sponge crushing system described in the present invention, preferably, the first-stage crushing system is also provided with an oversize material hopper, which is used to receive oversize material from the first-stage vibrating screen and transport it back to the silo of the first-stage crushing system through a belt conveyor system.

[0022] In addition, the present invention also provides a method for using the above-mentioned titanium sponge crushing system, after adding the sliced ​​material into the silo of the first-level crushing system, the fourth-level crushing system is operated for crushing, and a titanium sponge product with a size less than 12.7 mm and a weight accounting for 25-35% is obtained on the finished belt.

[0023] Preferably, the feeding rate of the first-stage crushing system is set to 1.8 t / h-2.2 t / h. The above feeding rate can increase the weight of the sponge titanium crushed particles with a size less than 12.7 mm.

[0024] The beneficial effects of the present invention are: The present invention provides a sponge titanium crushing system, which is divided into four levels. The 1-4 level crushers all adopt double-roller shearing crushers, corresponding to the 1-3 level linear vibrating double-layer screens, the upper and lower screens all adopt round hole screens, the apertures of the upper screen plates are 70mm, 50mm, and 20-35mm respectively, and the apertures of the lower screen plates are 17mm, which can increase the weight proportion of sponge titanium crushed particles with a size less than 12.7mm to more than 33%, thereby ensuring the quality of subsequent sponge titanium for preparing titanium alloys. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other embodiments can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a structural schematic diagram of a titanium sponge crushing system of the present invention.

[0027] Among them, 1- silo, 2- weighing belt conveyor, 3- crusher, 4- vibrating screen, 5- second metering feeder, 6- intermediate vibrating feeder, 7- material bucket on the screen, 8- high-angle belt, 9- vibrating feeder. DETAILED DESCRIPTION

[0028] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the embodiments of the present invention are further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0029] like Figure 1 As shown, a sponge titanium crushing system invented includes a 4-stage crushing system; wherein each stage of the crushing system includes a silo 1, a vibrating feeder 9, a crusher 3, and a vibrating screen 4; the crusher 3 adopts a roller shearing crusher; the 1-3-stage vibrating screens 4 are all linear vibrating double-layer screens, and the upper and lower screens thereof are round hole screens, the apertures of the upper screen plate are 70mm, 50mm, 20-35mm, respectively, and the apertures of the lower screen plate are 17mm; the vibrating screen 4 of the 4-stage crushing system is a single-layer vibrating square hole screen, and the side length of the screen plate hole is 17mm; the thickness of the cutter teeth of the 1-4-stage crushers are 60mm, 35mm, 18mm, and 12mm, respectively; It also includes an intermediate vibrating feeder 6, through which adjacent crushing systems are connected, and the intermediate vibrating feeder 6 transports the materials between the upper and lower screen plates of the upper vibrating screen and the screened materials of the lower vibrating screen 4 to the silo 1 of the lower crushing system through a belt conveyor system; A material discharging speed control system for the first-level crushing system is also provided, and the material discharging speed control system includes a weighing belt conveyor 2 and a main controller. The weighing belt conveyor 2 is used to weigh the material output by the vibrating feeder 9 and then convey it to the crusher 3 below. The weighing belt conveyor 2 is used to calculate the material discharging speed per unit time and send it to the main controller. The main controller controls the vibration frequency of the vibrating feeder 9 by comparing the predetermined material discharging speed with the calculated material discharging speed, thereby controlling the material discharging speed of the first-level crushing system; a vibrator is provided on the outer bin wall of the bin 1 of the first-level crushing system; Each level of the vibrating screen 4 is equipped with a video monitoring device and a knife tooth temperature control device; wherein the video monitoring device includes a monitor, and the monitor is connected to the monitoring control system; the device includes an infrared thermometer, a knife tooth cooling device and its temperature control system; the infrared thermometer is used to measure the temperature of the corresponding knife teeth, and the knife tooth cooling device is used to cool the corresponding knife teeth, and the temperature control system is respectively connected to the infrared thermometer and the frequency conversion controller of the knife tooth cooling device; The first-stage crushing system is also provided with an oversize material hopper 7, which is used to receive the oversize material of the first-stage vibrating screen and transport it back to the silo 1 of the first-stage crushing system through a belt conveyor system; It also includes a finished product belt 5, through which the undersize of the vibrating screen 4 of each level of the crushing system is transported; Preferably, the belt conveying system can use a belt 8 with a large inclination angle.

[0030] Implementation Method 1 The crushing method of the titanium sponge crushing system of the present invention is as follows: The parameters of the titanium sponge crushing system used in Example 1 are as follows: the thickness of the teeth of the crushers of levels 1-4 are 60 mm, 35 mm, 15 mm, and 10 mm respectively; the apertures of the upper screen plates of the linear vibrating double-layer screens of levels 1-3 are 70 mm, 50 mm, and 20 mm respectively, and the apertures of the lower screen plates are all 17 mm; the 4-level linear vibrating screen is a single-layer square hole screen, and the side length of the screen plate holes is 17 mm; The titanium sponge lump prepared by the magnesium thermal reduction method is sliced ​​to obtain sliced ​​material, which is fed into the silo 1 of the first-level titanium sponge crushing system through a feeding device. The feeding speed of the first-level crusher is set to 1.8 t / h for crushing. Finally, the titanium sponge particle products with a particle size less than 12.7 mm account for 35% by weight in the finished product belt 5.

[0031] Implementation Method 2 The crushing method of the titanium sponge crushing system of the present invention is as follows: The parameters of the titanium sponge crushing system used in Example 2 are as follows: the thickness of the teeth of the crushers of levels 1-4 are 60mm, 35mm, 18mm, and 12mm respectively; the apertures of the upper screen plates of the linear vibrating double-layer screens of levels 1-3 are 70mm, 50mm, and 3520mm respectively, and the apertures of the lower screen plates are all 17mm; the 4-level linear vibrating screen is a single-layer square hole screen, and the side length of the screen plate holes is 17mm; The titanium sponge lump prepared by the magnesium thermal reduction method is sliced ​​to obtain sliced ​​material, which is fed into the silo 1 of the first-level titanium sponge crushing system through a feeding device. The feeding speed of the first-level crusher is set to 2t / h for crushing. Finally, the titanium sponge particle products with a particle size less than 12.7mm account for 33% by weight in the finished product belt 5.

[0032] A person skilled in the art should understand that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the disclosure of the embodiments of the present invention (including the claims) is limited to these examples; under the concept of the embodiments of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and there are many other changes in different aspects of the embodiments of the present invention as described above, which are not provided in detail for the sake of simplicity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present invention should be included in the protection scope of the embodiments of the present invention.

Claims

1. A titanium sponge crushing system, characterized in that: It includes a 4-stage crushing system; among them, The crushing system at each level includes a silo, a vibrating feeder, a crusher, and a vibrating screen; the crusher is a roller shearing crusher; the vibrating screens at levels 1-3 are all linear vibrating double-layer screens, and the upper and lower screens are both round-hole screens, the apertures of the upper screen plates are 70mm, 50mm, and 20-35mm respectively, and the apertures of the lower screen plates are all 17mm; It also includes an intermediate vibrating feeder, through which the adjacent crushing systems are connected, and the intermediate vibrating feeder conveys the materials between the upper and lower screen plates of the upper vibrating screen and the screened materials of the lower vibrating screen to the silo of the lower crushing system; It also comprises a finished product belt, through which the undersize of the vibrating screen of each level of the crushing system is transported.

2. A titanium sponge crushing system according to claim 1, characterized in that: The vibrating screen of the four-stage crushing system is a single-layer vibrating square hole screen, and the side length of the screen plate holes is 17 mm.

3. A titanium sponge crushing system according to claim 1, characterized in that: The thickness of the teeth of the 1st to 4th grade crushers are respectively: 60mm, 35mm, 15mm-18mm, and 10mm-12mm.

4. A titanium sponge crushing system according to claim 1, characterized in that: A material discharge speed control system for the first-level crushing system is also provided, and the material discharge speed control system includes a weighing belt conveyor and a main controller. The weighing belt conveyor is used to weigh the material output by the vibrating feeder and then convey it to the crusher below. The weighing belt conveyor is used to calculate the material discharge speed per unit time and send it to the main controller. The main controller is connected to and controls the vibration frequency of the vibrating feeder, thereby controlling the material discharge speed of the first-level crushing system.

5. A titanium sponge crushing system according to claim 4, characterized in that: A vibrator is provided on the outer silo wall of the silo of the first-stage crushing system.

6. The titanium sponge crushing system according to claim 1, characterized in that: Each level of the vibrating screen is provided with a video monitoring device, including a monitor, and the monitor is connected to a monitoring control system.

7. The titanium sponge crushing system according to claim 5, characterized in that: Each level of crushers is equipped with a cutter tooth temperature control device, which includes an infrared thermometer, a cutter tooth cooling device and a temperature control system thereof; the infrared thermometer is used to measure the temperature of the corresponding cutter teeth, the cutter tooth cooling device is used to cool the corresponding cutter teeth, and the temperature control system is respectively connected to the infrared thermometer and the frequency conversion controller of the cutter tooth cooling device.

8. The titanium sponge crushing system according to claim 1, characterized in that: The first-stage crushing system is also provided with an oversize material hopper, which is used to receive the oversize material of the first-stage vibrating screen and transport it back to the silo of the first-stage crushing system through a belt conveyor system.

9. A method for using a titanium sponge crushing system according to any one of claims 1 to 8, characterized in that: After the sliced ​​material is added into the silo of the first-stage crushing system, the fourth-stage crushing system is operated for crushing, and sponge titanium products with a size less than 12.7 mm and a weight share of 25-35% are obtained on the finished belt.

10. A method for using the titanium sponge crushing system according to claim 4 or 5, characterized in that: The feeding rate of the first-stage crushing system is set to 1.8t / h-2.2t / h.

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