KR101090237B1 - Device for manufacturing metal grit and method for manufacturing its roller - Google Patents

Abstract

The present invention relates to a metal grit manufacturing apparatus for manufacturing a steel grit used to remove rust rusted on steels used in ships and the like, and a method for manufacturing a roller used in the apparatus, which is heat-treated to provide excellent wear resistance and rigidity. Produce grit by using, and by using hydraulic pressure so that the adhesion between the two rollers can be maintained for a long time, by minimizing the wear of the roller can be used for a long service life, mass production is possible It is possible to improve productivity and economics of using a mechanical device, and to produce grit having a uniform size and precision during grit processing, thereby improving product quality and productivity.

Shotball, steel, roller, wear, heat treatment, hydraulic cylinder

Description

Device for manufacturing metal grit and method for manufacturing its roller

The present invention relates to a metal grit manufacturing apparatus for producing steel grit used to remove rust that has been rusted on steels used in ships and the like, and a method for manufacturing rollers used in the apparatus.

Conventionally, oxidized parts such as steels have been removed by a shot blasting method using mainly sand and air pressure, but recently, oxidized parts have been improved by using metal shot balls made by melting steel.

The sand blasting method uses a blasting method using a metal shortball, which is more productive, recyclable, and cost-effective, due to the disadvantages of environmental pollution due to a lot of dust and poor workability. It is.

In addition, the metal grit (Metal Grit) of the additional processing of the metal short ball is used in the shipyard, etc. for rust removal of ships.

That is, an irregular short ball made by melting iron is passed between the rotating rollers to be pulverized into chips to make metal grit. Usually, the metal grit is processed to a size of about 0.1 mm to 5 mm.

Such a metal grit is to use a metal grit manufacturing apparatus, the conventional metal grit manufacturing apparatus is composed of a structure that adheres to the roller using a spring, etc., and also because the durability of the roller is inferior, it is difficult to produce a grit of uniform size Of course, there is a problem that the roller is easily worn or damaged in the process of manufacturing the grit by pressing a metal, such as steel, so that the life is short and often need to be replaced.

The present invention has been made in order to solve the above problems, by using a special heat-treated roller, and also configured to maintain the adhesion of the two rollers for a long time by using a hydraulic pressure, uniform size and precision It is an object of the present invention to provide a metal grit manufacturing apparatus and a roller manufacturing method thereof, which are capable of producing a grit having an), improving productivity, and improving economics by prolonging the service life of a mechanical device. have.

Metal grit manufacturing apparatus according to the present invention for achieving the above object, the support; A housing positioned above the support to form a path to be crushed and discharged after the grit production material is input; A pair of crushing rollers positioned inside the housing to crush the grit manufacturing material to form grit; A pair of roller shafts protruding to both sides of the grinding rollers; Both shaft supports provided on both sides of the housing to rotatably support the pair of roller shafts; A gap adjusting mechanism which is provided on each of the shaft supports and adjusts the distance between the pair of grinding rollers by pressing one roller shaft by using hydraulic pressure provided in the hydraulic cylinder; It is characterized in that it comprises a rotary drive mechanism connected to the at least one roller shaft to rotate the roller shaft.

The shaft support is provided with a bearing for rotatably supporting each roller shaft, a bearing block for supporting the bearing, and a direction orthogonal to the roller shaft so that at least one roller shaft moves in a direction in which the grinding roller can be spaced apart. It is preferable that the upper and lower guide blocks are configured to be supported.

At this time, one of the pair of roller shaft and the bearing block for supporting it is fixed in position, the other roller shaft and the bearing block for supporting it may be configured to be movable along the guide block.

The gap adjusting mechanism may include a hydraulic cylinder supported by the fixed structure of the shaft support, and an assembly connecting the piston rod of the hydraulic cylinder to a bearing block movable along the guide block. Do.

Next, the roller manufacturing method of the metal grit manufacturing apparatus according to the present invention for realizing the above object, the roller is made of a cylindrical structure when the temperature of the heat treatment equipment is less than 500 ℃, and then the temperature of the heat treatment equipment 800 A first step of raising the temperature to ℃; If the temperature of the heat treatment equipment is 800 ℃ or more during the first step, pre-heating for about 2 to 8 hours while maintaining the temperature of the equipment constant between 800 ℃ ~ 900 ℃ roller A second step of heating the whole to a uniform temperature; After the second step, the third step of performing a high temperature heat treatment for 2 to 8 hours in a state in which the temperature of the heat treatment equipment is raised to 1000 ℃ ~ 1080 ℃; A fourth step of cooling the surface temperature of the roller heat-treated in the third step to be 150 ° C. or less; A fifth step of gradually increasing the temperature of the equipment by re-inserting the roller when the temperature of the heat treatment equipment is less than 200 ° C. while the surface temperature of the roller is cooled to about 100 ° C. to 150 ° C. in the fourth step; When the temperature of the heat treatment equipment is 300 ℃ or more during the fifth step, pre-heating for 2 to 8 hours while maintaining the temperature of the equipment at 300 ℃ ~ 350 ℃ uniform temperature throughout the roller A sixth step of heating with; After the sixth step, when the temperature of the heat treatment equipment to increase the temperature of the equipment to more than 480 ℃, the seventh step of performing a medium temperature heat treatment operation for 2 to 8 hours while the temperature is raised to 480 ℃ ~ 550 ℃; And an eighth step of cooling the roller heat-treated in the seventh step by a method of oil cooling or air cooling.

Here, in the fourth step, under the condition that the temperature of the cooling oil is 30 ℃ ~ 70 ℃, the temperature of the roller heat-treated until the third stage is cooled to 500 ℃ within 25 minutes from the cooling start temperature, and then within 4 hours It is preferable to cool so that the temperature of a roller may be 150 degrees C or less.

Metal grit manufacturing apparatus and its roller manufacturing method according to the present invention is configured to produce a grit using a heat-treated processing roller excellent in wear resistance and rigidity can minimize the occurrence of wear of the roller to extend the service life As a result, mass production becomes possible, which can improve the productivity of the product and the economics of using the machine.

In addition, according to the present invention, since the adhesion between the two rollers can be maintained for a long time by using hydraulic pressure, it is possible to produce a grit having a uniform size and precision during grit processing, thereby improving product quality and productivity. It can work.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a plan view of a metal grit manufacturing apparatus according to the present invention, FIG. 2 is a front view of the metal grit manufacturing apparatus according to the present invention, FIG. 3 is a side view of the metal grit manufacturing apparatus according to the present invention, and FIG. 4 is a main part of FIG. Fig. 5 is a detailed view of the main part of Fig. 3. 6 is a hydraulic circuit diagram of a metal grit manufacturing apparatus according to the present invention.

Metal grit manufacturing apparatus according to an embodiment of the present invention, as shown in Figures 1 to 5, is located on the support 10, the upper portion of the support 10 is crushed and discharged after the input material for manufacturing the grit A housing 20 forming a path to make a path, a pair of grinding rollers 30 (31, 32) positioned in the housing 20 to grind the material for manufacturing the grit to produce the grit, and each grinding roller ( A roller shaft (35; 36, 37) projecting to both sides of the 30, a shaft support (40) rotatably supporting the roller shaft (35) on both sides of the housing (20), and the shaft support (40). Is connected to the gap adjusting mechanism 50 for adjusting the distance between the pair of grinding rollers 31 and 32, and the rotary drive mechanism 60 is connected to either roller shaft 36 to generate rotational power It consists of

Each structure of the metal grit manufacturing apparatus which concerns on this invention comprised in this way is demonstrated.

First, referring to FIGS. 2 and 3, the support 10 may include a housing 20, a grinding roller 30, a shaft support 40, a gap adjusting mechanism 50, and a rotation driving mechanism 60. It is comprised so that the apparatus of this invention can be stably supported.

The support 10 can be configured by assembling in the vertical and horizontal direction using the H-shaped steel, etc., if not limited to this structure can be configured to adopt a variety of structures that can stably support the device of the present invention. to be.

 Next, referring to Figures 1 to 3, the housing 20 is configured with a hopper 21 into which grit material can be put on the upper part, and is processed by a pair of grinding rollers 31 and 32 at the lower part. A discharge part 23 through which the grit is discharged is configured.

At this time, the position of the inlet (21a) consisting of the hopper 21 is preferably configured to be positioned between the pair of rollers 31, 32, the discharge portion 23 is the outer side of the support (10) Towards, the lower end portion is preferably positioned to a certain degree from the floor on which the support 10 is installed. This is configured to conveniently store the grit discharged from the housing 20 by using a container or the like.

Next, the crushing roller 30 is configured to be squeezed to crush the grit material when the pair of grit manufacturing materials pass therebetween in a state where the pair is in close contact with each other.

These grinding rollers 31 and 32 are each configured to rotate together with the roller shaft in a state fixed to the roller shafts 36 and 37, the first grinding roller 31 is the rotary drive mechanism 60 The second grinding roller 32 is composed of an idler roller which rotates together as the first grinding roller 31 rotates by the mutual adhesion with the first grinding roller 31.

Since the pair of grinding rollers 31 and 32 grind the steel grit, the wear resistance is very important. The method of manufacturing the grinding roller of the present invention which greatly improves the wear resistance will be described below. .

Next, referring to FIGS. 4 and 5, the shaft support 40 is a pair of rollers 31 (while rotatably supporting the roller shafts 36 and 37 of the grinding rollers 31 and 32. 32) is configured to enable the gap between.

To this end, the shaft support 40 is provided with bearings 41 rotatably supporting the roller shafts 36 and 37, respectively, which are supported by the bearing block 43. The bearing block 43 is configured to be movable between the upper and lower guide blocks 44 and 45 in a direction orthogonal to the axis, in order to adjust the distance between the pair of grinding rollers 31 and 32. The upper and lower guide blocks 44 and 45 have a structure fixed to each other by a vertical assembly 46 installed vertically on both sides.

Here, the bearing block 43 is provided with four pairs of left and right pairs, one side of the grinding roller 31 is fixed to the position, the other side of the grinding roller 32 to move only two It is preferable to configure so that the space | interval between the grinding rollers 30 may be adjusted.

At this time, referring to Figure 4, the bearing block 43A on the left side of the grinding roller 31 is fixed to one frame 46 through the fixing bracket 47, the bearing block (the side of the right side of the grinding roller 32) ( 43B) is preferably configured to move left and right along the upper and lower guide blocks 44, 45.

Next, as shown in FIG. 4, the gap adjusting mechanism 50 configures the hydraulic cylinder 51 by using a force, and the piston rod 52 constituting the hydraulic cylinder 51 forms the assembly 53. It has a structure connected to one bearing block 43B through. Of course, the frame 46 is provided with a cylinder fixing bracket 48 for fixing the position of the hydraulic cylinder 51.

As such, the gap between the two grinding rollers 30 is configured to be adjusted with a constant force by using a hydraulic device, so that the distance between the two rollers is always kept constant than the conventional spring method, so that the grit has a uniform size. Mass production of is possible.

The configuration of the hydraulic device 70 for controlling the hydraulic cylinder 51 of the gap adjusting mechanism 50 will be described below in detail with reference to FIG. 5.

Next, referring to FIGS. 1 and 2, the rotary drive mechanism 60 includes a drive motor 61 fixed to an upper portion of the support 10 and a rotational force of the motor 61. It consists of a belt (63) and pulleys (65) (66) to transmit to the rotational power of the drive motor (61) through the belt (63) and pulleys (65) (66) to one roller shaft (36). As a result, both of the grinding rollers 31 and 32 can be rotated.

Referring now to FIG. 6, a hydraulic apparatus 70 for operating the spacing mechanism 50 will be described.

In the figure, reference numeral 71 denotes a hydraulic tank, reference numeral 72 denotes a level gauge, and reference numeral 73 denotes an air breather.

The fluid stored in the hydraulic tank 71 is sucked through the suction filter 75 by the operation of the hydraulic pump 74, and then supplied or discharged to the two hydraulic cylinders 51 according to the operating position of the directional valve 76. .

In the drawings, reference numeral 77 denotes a motor.

The directional valve 76 may be configured in the manifold block 78, the check valve to prevent the fluid provided from the hydraulic pump 74 to the directional valve 76 to flow back (79), a pressure gauge 80 for measuring the hydraulic pressure provided to the direction switching valve 76, a relief valve 81 for releasing the pressure in the event of excessive pressure, and two through the direction switching valve 76 A pair of check valves 82 can be configured to prevent backflow of the fluid provided to the hydraulic cylinder 51.

Here, the direction switching valve 76 is preferably configured to be electronically controlled by the solenoid valve, it is preferable to configure using a four-pod three-position switching valve.

In addition, when operating the hydraulic cylinder 51 in the direction in which the pair of grinding rollers 31 and 32 are in close contact with each other, there is provided a accumulating device 83 that can always provide a constant pressure hydraulic pressure, this accumulating pressure Device 83 consists of an accumulator.

In the figure, reference numeral 84 denotes a stop valve, 85 a pressure switch, 86 a relief valve, 87 a pressure gauge, and 88 a throttle check valve.

Now, the manufacturing method of the above-mentioned grinding roller 30 is demonstrated.

First, a grinding roller is produced. At this time, as the material of the roller, STD11 steel (KS standard), which is an alloy tool steel used in a cold work die, can be used. The roller is manufactured in a cylindrical structure so that the roller shaft 35 can be inserted in the center thereof.

Next, after the grinding roller is put into the heat treatment equipment, the first heat treatment is performed.

In the heat treatment equipment, a heating method may be used as in the conventional heat treatment equipment, and a roller is put into the equipment to perform a heat treatment process.

In the roller feeding time, it is preferable that the temperature of the heat treatment equipment is input at less than 500 ° C. so that cracks do not occur when the roller is loaded, and then the roller is heat treated while the temperature of the equipment is continuously increased.

When the temperature of the heat treatment equipment is 800 ℃ or more, the pre-heating (pre-heating) for about 2 to 8 hours while maintaining a constant between 800 ℃ to 900 ℃ to ensure that the entire roller is heated to a uniform temperature. Thereafter, the equipment is heated again, and the temperature is raised to 1000 ° C. to 1080 ° C., and high temperature heat treatment is performed for 2 to 8 hours in this temperature range.

Next, after performing the first heat treatment as described above, the roller is cooled.

The temperature of the cooling oil used in the roller cooling process is preferably about 30 ° C. to 70 ° C., and the roller is cooled while stirring the oil for about 1 to 4 hours.

At this time, the cooling temperature of the roller to cool the temperature of the first heat-treated roller to about 500 ℃ within 25 minutes from the cooling start temperature, and then to cool the roller temperature to 150 ℃ within 4 hours.

Next, the roller cooled as described above is put into the heat treatment equipment again, and the secondary heat treatment is performed.

At this time, the surface temperature of the roller is cooled to about 100 ~ 150 ℃, when the temperature of the secondary heat treatment equipment is less than 200 ℃ by inserting the roller to start the secondary heat treatment.

Then, the temperature of the heat treatment equipment is subjected to preheating for 2 to 8 hours at 300 ℃ ~ 350 ℃, then the temperature of the equipment is heated to 480 ℃ to 550 ℃ to perform a final heat treatment for 2 to 8 hours.

Next, the roller heat-treated secondly by the above method is cooled by oil or air cooling to complete the heat treatment of the roller.

As shown in FIG. 5, the roller manufactured as described above is used to be mounted and assembled with a fixing bolt or the like on the roller shaft 35.

It describes the operation method of the metal grit manufacturing apparatus according to the present invention configured as described above.

Before injecting the material for producing the grit into the metal grit manufacturing apparatus according to the present invention, iron, which is a raw material, is melted, and water is sprayed and quenched while dropping (dropping) the molten water. After that, using a classifier to classify according to the size of the particles, the metal grit material having a particle size within a predetermined range is put into the metal grit manufacturing apparatus according to the invention for processing. In this case, the metal grit may use other metal materials or other various materials that can be broken in addition to the steel material.

Specific operation method of the metal grit manufacturing apparatus is as follows.

First, the drive motor is operated to rotate the pair of grinding rollers 31 and 32, and the hydraulic device 70 is operated to advance the hydraulic cylinder 51. At this time, the pair of the grinding rollers 31, 32 are in close contact with each other, or the hydraulic pressure is adjusted to maintain the set interval to adjust the interval between the pair of grinding rollers 31, 32.

In this state, the raw materials having the particle size selected through the classifier are introduced into the hopper 21. The particles introduced into the hopper 21 are compressed while passing through the grinding roller 30 and then discharged to the outside through the discharge unit 23. At this time, the pair of grinding rollers 31 and 32 are in close contact with each other by the hydraulic force provided by the hydraulic cylinder 51, or in the state of maintaining a constant gap, by pressing the input grit production material to grind or It is pressed.

As described above, the metal grit manufactured by the metal grit manufacturing apparatus according to the present invention is sorted according to the particle size using a classifier device, and then completed through a heat treatment process.

Although the present invention has been described through the embodiments described in the drawings and the detailed description of the invention, this is merely exemplary, and various modifications and equivalent other embodiments are possible to those skilled in the art to which the present invention pertains. . Accordingly, the technical scope of the present invention should be determined by the appended claims.

1 is a plan view of a metal grit manufacturing apparatus according to the present invention,

2 is a front view of a metal grit manufacturing apparatus according to the present invention;

Figure 3 is a side view of the metal grit manufacturing apparatus according to the present invention,

4 is a detailed view of the main part of FIG.

5 is a detailed view of the main part of FIG.

6 is a hydraulic circuit diagram of a metal grit manufacturing apparatus according to the present invention.

Claims (6)

A first step of introducing a roller manufactured in a cylindrical structure when the temperature of the heat treatment equipment is less than 500 ° C., and then raising the temperature of the heat treatment equipment to 800 ° C .; If the temperature of the heat treatment equipment is more than 800 ℃ during the first step, by pre-heating for 2 to 8 hours while maintaining the temperature of the heat treatment equipment constant between 800 ℃ ~ 900 ℃ A second step of heating the entire roller to a uniform temperature; After the second step, the third step of performing a high temperature heat treatment for 2 to 8 hours in a state in which the temperature of the heat treatment equipment is raised to 1000 ℃ ~ 1080 ℃; A fourth step of cooling the surface temperature of the roller heat-treated in the third step to be 150 ° C. or less; A fifth step of gradually increasing the temperature of the heat treatment equipment by re-inserting the roller when the temperature of the heat treatment equipment is less than 200 ° C. while the surface temperature of the roller is cooled to 100 ° C. to 150 ° C. in the fourth step; When the temperature of the heat treatment equipment is 300 ℃ or more through the fifth step, pre-heating for 2 to 8 hours while maintaining the temperature of the heat treatment equipment constant at 300 ℃ ~ 350 ℃ to uniform the entire roller A sixth step of heating to a temperature; After the sixth step, when the temperature of the heat treatment equipment to increase the temperature of the equipment to more than 480 ℃, the seventh step of performing a medium temperature heat treatment operation for 2 to 8 hours while the temperature is raised to 480 ℃ ~ 550 ℃; And a eighth step of cooling the roller heat-treated in the seventh step by a method of oil cooling or air cooling. The method according to claim 1, In the fourth step, under the condition that the temperature of the cooling oil is 30 ° C. to 70 ° C., the temperature of the roller heat-treated to the third step is cooled to 500 ° C. within 25 minutes from the cooling start temperature, and then the rollers within 4 hours. The roller manufacturing method of the metal grit manufacturing apparatus characterized by cooling so that the temperature of 150 degrees C or less. A support; A housing positioned above the support to form a path to be crushed and discharged after the grit production material is input; A pair of grinding rollers, which are located in the housing to grind the material for manufacturing the grit to form a grit, manufactured by the roller manufacturing method of claim 1; A pair of roller shafts protruding to both sides of the grinding rollers; Both shaft supports provided on both sides of the housing to rotatably support the pair of roller shafts; A gap adjusting mechanism which is provided on each of the shaft supports and adjusts the distance between the pair of grinding rollers by pressing one roller shaft by using hydraulic pressure provided in the hydraulic cylinder; And a rotary drive mechanism connected to the at least one roller shaft to rotate the roller shaft. delete delete delete

Images