Sand blasting aging box-type furnace and sand blasting aging production process

Abstract

The invention discloses a sand blasting aging box-type furnace and a sand blasting aging production process, and the box-type furnace comprises a sand storage box and a box chamber which are communicated through a sand feeding pipeline, a sand collection box which is communicated with the box chamber through a sand shakeout hole, a sand conveying pipe which is communicated with the sand collection box and the sand storage box, and a sand gun which is connected with the sand feeding pipeline so as to spray blasting sand towards the inner side of the box chamber, the running roller way set is arranged on the bottom side of the box chamber and used for bearing the material frame, the power fan is used for applying negative pressure to the sand storage box, the flame gun is used for heating the inner side of the box chamber, the fan opening blows air to the inner side of the box chamber to form air heat circulation, and the wind shield is arranged opposite to the flame gun. The production process comprises an aging step and a sand blasting step, specifically, a power fan is started, blasted sand is introduced into a sand discharging pipeline from a sand storage box, is sprayed out of a sand gun and is sprayed to the surface of a profile in a material frame, the bounced blasted sand falls into a sand collection box from a box chamber through a sand falling hole, and the blasted sand in the sand collection box is sucked into the sand storage box through a sand conveying pipe by negative pressure in the sand storage box; therefore, the cycle work of sand blasting is realized, and the process time can be shortened.

Description

Technical Field

[0001] The invention relates to the field of process equipment, and in particular to a sandblasting aging box furnace and a sandblasting aging production process. Background Art

[0002] At present, the sandblasting machine and the aging furnace are independent devices, and they are two independent processes in the process flow. The sandblasting process is mainly responsible for removing the surface defects of aluminum alloy profiles (mainly referring to surface stripes and fine scratches), but light sandblasting cannot effectively remove surface defects, and heavy sandblasting can easily bend the aluminum alloy profiles. Even if you try to perform light sandblasting and then ageing, that is, before the aluminum alloy profile is aged and has a low hardness, light sandblasting can remove the surface defects of the aluminum alloy profile, and then perform aging strengthening treatment, but the profile is very soft before aging, and even light sandblasting can easily cause the profile to bend. Therefore, a solution that takes into account both sandblasting effect and aging treatment is needed. Summary of the invention

[0003] To solve the above problems, the purpose of the present invention is to provide a sandblasting and aging box furnace and a production process. By combining the two traditional devices used for sandblasting and aging into one device, the floor space is reduced, the energy consumption is reduced, the cost is reduced, and the production efficiency is improved.

[0004] According to one aspect of the present invention, there is provided a sandblasting aging box furnace, comprising: a sand storage box and a box chamber connected via a lower sand pipe, a sand collecting box connected to the box chamber via a sand drop hole on the bottom side of the box chamber, a sand transport pipe for connecting the sand collecting box and the sand storage box, a sand gun connected to the lower sand pipe to spray the sand from the lower sand pipe toward the inside of the box chamber, a running roller group arranged at the bottom side of the box chamber to receive a material frame delivered into the box chamber via a furnace door, a power fan for applying negative pressure to the sand storage box, a flamethrower for heating the inner side of the box chamber, a fan port for blowing air to the inner side of the box chamber to form an air heat circulation, and a wind shield arranged opposite to the flamethrower.

[0005] Preferably, the material frame includes a plurality of vertical beams on which rollers are rotatably mounted, and a layer of rollers for supporting the same profile constitutes a forward and backward moving wheel set.

[0006] Preferably, a vertical bar for restricting the back-and-forth movement range of the profile is arranged on the crossbeam of the material frame.

[0007] Preferably, the surface of the roller of the front and rear moving wheel set is a layer of heat-resistant sticky pad.

[0008] Preferably, the sand storage box is a closed chamber, and / or the sand gun comprises a downward sand gun and an upward sand gun which are arranged on the inner wall of the box chamber and blast sand in different directions.

[0009] Preferably, the fan port comprises a left fan port for blowing air to the right and a right fan port for blowing air to the left.

[0010] Preferably, a double-chamber box structure is used, and the sand storage box delivers blasting sand to each chamber respectively.

[0011] According to another aspect of the present invention, a sandblasting aging production process is provided, using the above-mentioned sandblasting aging box furnace, comprising: an aging step, which comprises: igniting and burning a flamethrower to heat the air above the windshield, and blowing air from the blower port to realize air thermal circulation in the box chamber; a sandblasting step, which comprises: starting the power blower, introducing the sand from the sand storage box into the lower sand pipe, spraying from the sand gun, and spraying the sand onto the surface of the profile in the material frame, and the rebounded sand falls from the box chamber through the sand falling hole into the sand collecting box, and the negative pressure in the sand storage box sucks the sand in the sand collecting box into the sand storage box through the sand transport pipe, thereby realizing the circulation of sandblasting.

[0012] Preferably, the sandblasting and aging production process sequence implements at least two adjacent steps selected from aging, sandblasting, aging, sandblasting, and aging.

[0013] Preferably, the combustion power of each flamethrower is 300,000 kcal, the air volume of each fan port is 1800-2000 m³ / h, the single cycle time of switching the wind direction is 180-190s, and after the temperature of the chamber rises to 190°C, insulation begins, the temperature drops to 185°C, and the cycle heating is restarted. When it rises to 195°C, heating is stopped to keep the chamber between 185 and 195°C. Within 10-15 minutes of insulation, the flamethrower and the fan port are closed, the power fan is started, the wind pressure is 5-8Mpa, the wind pressure of sand blasting with a sand gun is 2-2.5Mpa, and the negative pressure inside the sand storage box reaches 4-7Mpa. After 5-8 minutes of sand blasting, the sand blasting step is stopped, and the aging step is restarted to keep the chamber at 185-195°C to complete the subsequent aging work of 150-180 minutes.

[0014] The beneficial effects of the present invention are as follows: the two devices are combined to shorten the process time. The aluminum alloy profile is subjected to preliminary aging, and when the aluminum alloy profile has a certain hardness, light sandblasting is performed to effectively remove the surface defects of the aluminum alloy profile without causing the profile to bend. In the case where the surface stripes or fine scratches of the aluminum alloy profile are relatively serious, enhanced sandblasting can be performed again at the end of aging to achieve the purpose of eliminating the surface defects of the aluminum alloy profile. The aluminum alloy profile is in the material frame, and the wheel group moves back and forth in a small amplitude, so that the aluminum alloy surface is sandblasted more evenly.

[0015] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of sandblasting aging furnace.

[0017] Figure 2 This is the front view of the sandblasting aging furnace (without the material frame).

[0018] Figure 3 This is a side view of the sandblasting aging furnace (with material frame).

[0019] Figure 4 A partial schematic diagram showing the state in which the profile is arranged on the front and rear moving wheel set in the material frame.

[0020] Figure 5 A top view of the material frame is shown.

[0021] Explanation of the accompanying drawings: 10-aging system, 11-left fan outlet, 12-flame spray gun, 13-right fan outlet, 14-running roller group, 15-wind shield, 16-box chamber, 17-chain track, 18-furnace door, 20-material frame, 21-front and rear moving wheel group, 22-vertical railing, 23 vertical beam, 24 horizontal beam, 30-sand blasting system, 31-downward sand gun, 32-upward sand gun, 33-sand falling hole, 34-sand collecting box, 35-sand transport pipe, 36-sand storage box, 37-sand lowering pipeline, 38-power fan. DETAILED DESCRIPTION

[0022] The exemplary embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. The exemplary embodiments described below and shown in the accompanying drawings are intended to teach the principles of the present invention so that those skilled in the art can implement and use the present invention in several different environments and for several different applications. Therefore, the scope of protection of the present invention is defined by the appended claims, and the exemplary embodiments are not intended to be, and should not be considered to be, a limiting description of the scope of protection of the present invention. Moreover, for the convenience of description, the sizes of the various parts shown in the accompanying drawings are not necessarily drawn according to the actual proportional relationship, and the orientation description, such as the longitudinal direction corresponding to the longitudinal length of the main body, and the orientation or position relationship indicated by the upper, lower, left, right, top, bottom, etc., are all based on the orientation or position relationship shown in the accompanying drawings, which is 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. Unless otherwise specifically stated, the order of the components and assembly steps described in the embodiments and the numerical values ​​do not limit the scope of the present invention. Moreover, any numerical range stated herein is intended to include all sub-ranges contained therein, and the numerical range represented by "value A to value B" refers to a range including the endpoint values ​​A and B. Those skilled in the art will understand that the terms "first", "second", "step" and the like in the present invention are only used to distinguish different steps, devices or modules, etc., and do not represent any specific technical meanings, nor do they represent the necessary logical order between them. For example, the second and third steps can be swapped or performed in parallel.

[0023] According to the present invention, a sandblasting aging box furnace and a production process are provided. Aluminum alloy profiles can enter the box chamber 16 of the box furnace for aging. After a period of time, when the hardness of the profile is moderate, the sandblasting system performs sandblasting on the profile.

[0024] like Figures 1 to 3 As shown, the box-type furnace uses a double-chamber box structure, and the sand storage box 36 delivers sandblasting in the form of glass sand to each chamber 16 through two lower sand pipes 37, which is to further increase the work efficiency. Of course, it is not limited to this, and one or more chamber structures can also be used according to the use scenario. The structure and working principle of one chamber are mainly explained below.

[0025] In terms of functions, the box-type furnace includes an aging system 10 , a material frame 20 , and a sandblasting system 30 .

[0026] The aging system 10 includes: a left fan port 11, a flamethrower 12, a right fan port 13, a running roller table group 14, and a wind shield 15.

[0027] The material frame 20 includes: a front and rear moving wheel set 21, a vertical rail 22, a vertical beam 23, and a horizontal beam 24.

[0028] The sandblasting system 30 includes: a downward sand gun 31, an upward sand gun 32, a sand falling hole 33, a sand collecting box 34, a sand transport pipe 35, a sand storage box 36, a sand lowering pipeline 37, and a power fan 38.

[0029] In terms of structure, the box-type furnace includes: a sand storage box 36 and a chamber 16 connected via a lower sand pipe 37, a sand collecting box 34 connected to the chamber 16 via a sand drop hole 33 on the bottom side of the chamber 16, a sand transport pipe 35 for connecting the sand collecting box 34 and the sand storage box 36, a sand gun connected to the lower sand pipe 37 to spray the sand from the lower sand pipe 37 toward the inside of the chamber 16, a running roller group 14 arranged on the bottom side of the chamber 16 to receive the material frame 20 fed in via the furnace door 18, a power fan 38 for applying negative pressure to the sand storage box 36, a flamethrower 12 for heating the inside of the chamber 16, a fan port for blowing air to the inside of the chamber 16 to form an air heat circulation, and a windshield 15 arranged opposite to the flamethrower 12.

[0030] The aluminum alloy profile 25 as the process object is mounted on the front and rear moving wheel sets 21 composed of rollers rotatably mounted on the vertical beams 23 in the material frame 20. Figure 4As shown. When the material frame 20 is sent into the box chamber 16 on the rear side of the furnace door 18 via the chain track 17 for sandblasting, the glass sand hits the profile 25 in the material frame 20, and the reaction force causes the profile 25 to move horizontally left and right along the front and rear moving wheel set 21 of the layer where it is located. The vertical bars 22 inserted in the crossbeams 24 of the material frame 20 can restrict the back and forth movement range of the profile 25. If the profile 25 is matched with the traditional sticky pads fixedly arranged on each vertical beam 23, the place where the profile 25 and the sticky pad contact each other will not be effectively sprayed by the glass sand. This is because the traditional fixed sticky pad is a rectangular cross-section, and when the profile 25 is placed on the sticky pad, there will be a relatively large contact area. Different from this, in the present invention, the traditional fixed sticky pad is replaced by the front and rear moving wheel set 21, and the wheel set moves a small amount of floating movement back and forth, which allows the previous contact position to be exposed, so that it is easy to be hit by the glass sand. This is because the front and rear moving wheel set 21 and the profile 25 are in line contact, and the front and rear moving wheel set 21 will move to further expose the contact area, thereby achieving the purpose of effective and uniform sandblasting.

[0031] For the profile 25 in the material frame 20 sent into the box chamber 16, according to its stripes or fine scratches and hardness, at least two adjacent process treatments selected from aging, sandblasting, aging, sandblasting, and aging steps can be used to obtain good expected results.

[0032] <Operation Principle of Time Aging System 10>

[0033] The flamethrower 12 uses natural gas and air as a mixed fuel to ignite and burn to release heat, and the wind shield 15 below prevents the open flame from directly burning the profile 25. After the fuel burns, the air above the wind shield 15 is heated, and the left fan port 11 blows air to the right for a period of time, and the hot air is blown to the right. Due to the blowing to the right, the left side forms a negative pressure, and the hot air circulation of the box on the left side of the wind shield 15 is reheated to the right side, and the air in the entire box realizes an air heat circulation from left to right.

[0034] After circulating for a period of time, the left fan port 11 stops blowing air and the right fan port 13 starts. The process is exactly the opposite of the previous step, and the air in the entire box realizes air heat circulation from right to left.

[0035] <Sandblasting System 30 Operating Principle>

[0036] The power fan 38 is started, and the glass sand is introduced from the sand storage box 36 into the lower sand pipe 37, and is sprayed out from the downward sand gun 31 and the upward sand gun 32. The glass sand is sprayed onto the surface of the profile 25 in the material frame 20. The rebounded glass sand falls downward into the box due to gravity, and the glass sand falls from the sand falling hole 33 to the sand collecting box 34 for centralized temporary storage.

[0037] The sand storage box 36 is a closed chamber, and negative pressure is present inside because the power fan 38 sucks away the glass sand. The sand storage box 36 and the sand collection box 34 are connected through the sand transport pipe 35. The negative pressure in the sand storage box 36 will suck the glass sand in the sand collection box 34 into the sand storage box 36 through the sand transport pipe 35, thereby realizing the circulation of the glass sand.

[0038] In this way, the box furnace is used as both an aging furnace and a sandblasting box.

[0039] <The coupling effect of sandblasting and aging on profiles>

[0040] After the aging furnace has been running for a period of time, the aluminum alloy profile 25 is partially strengthened to about 40-50% of the peak strength.

[0041] The aging system 10 is turned off, and the sandblasting system 30 is turned on. Glass sand is hit on the surface of the aluminum alloy profile 25. Since the surface of the aluminum alloy profile is softer than that of the normally aged aluminum alloy profile, the glass sand hitting the surface of the aluminum alloy profile 25 can effectively cause a large number of micro pits to deform the surface of the aluminum alloy profile 25, thereby eliminating surface stripes and fine scratches.

[0042] At this time, using low-power sandblasting can achieve better sandblasting effect. Since the interaction force between glass sand and aluminum alloy is also reduced, the breakage of glass sand is also reduced, and the life of glass sand is increased. That is, the consumption of glass sand will be greatly reduced, saving costs.

[0043] The sandblasting system 30 can be turned on for a few minutes and then turned off, and the aging system 10 can be turned on to complete the subsequent aging process.

[0044] Of course, sandblasting can also be divided into multiple stages of sandblasting, and the settings can be adjusted according to needs, which will not be elaborated here.

[0045] <Example 1>

[0046] Take the aged and sandblasted 6005 alloy aluminum alloy photovoltaic frame and the normal extrusion stripes on the profile surface as an example. The composition of 6005 alloy meets the requirements of GBT3190-2020.

[0047] The combustion power of each flamethrower 12 of the aging system 10 is 300,000 kcal. The air volume of the left blower port 11 or the right blower port 13 is 1800-2000 m³ / h.

[0048] The single cycle time of blowing from the left fan port 11 or blowing from the right fan port 13 by switching the wind direction is 180 to 190 seconds.

[0049] After the temperature rises to 190℃, start keeping warm, then drop the temperature to 185℃, restart the cycle heating, and stop heating when it rises to 195℃, so that the furnace temperature is kept between 185 and 195℃.

[0050] After 10 to 15 minutes of heat preservation, the aging system (flame spray gun 12, left fan port 11 or right fan port 13) is turned off. At this time, the tensile strength of the profile is about 120 to 135 MPa according to the test, which is about 41.38% to 46.55% of the peak strength (about 290 MPa).

[0051] After the above aging is completed, the sandblasting system is turned on to start sandblasting.

[0052] The power fan 38 is started, and the wind pressure is 5-8Mpa. The glass sand is introduced from the sand storage box 36 into the lower sand pipe 37, and sprayed from the downward sand gun 31 and the upward sand gun 32. The wind pressure of the downward sand gun 31 and the downward sand gun 32 is 2-2.5Mpa. The angle between the downward sand gun 31 and the inner wall on the inner wall of the sandblasting aging box furnace is 60 (0, -0.3) °, and the angle between the downward sandblasting gun 32 and the inner wall is 60 (0, -0.3) °. The glass sand is sprayed onto the surface of the profile in the material frame 20, and the rebounded glass sand falls down to the box due to gravity. The glass sand falls from the sand falling hole 33 to the sand collecting box 34 for centralized temporary storage.

[0053] The sand storage box 36 is a closed chamber. As the power fan 38 sucks the glass sand away, the negative pressure inside reaches 4-7 MPa. The sand storage box 36 and the sand collection box 34 are connected through the sand transport pipe 35. The negative pressure inside the sand storage box 36 will suck the glass sand in the sand collection box 34 into the sand storage box 36 through the sand transport pipe 35, thereby realizing the circulation of the glass sand.

[0054] The vertical bar 22 in the material frame 20 is a square with a cross section of 5 (± 1) mm * 5 (± 1) mm, and the height supports the material frame 20 up and down. The material is also aluminum alloy, and the surface is covered with a layer of 3 (± 0.5) mm heat-resistant rubber. The front and rear moving wheel set 21 is an iron wheel with a cross-sectional diameter of 30 (± 0.5) mm, and the surface is a layer of 5 (± 0.5) mm thick heat-resistant wool pad. When running, Figure 4 In the front-to-back direction, the aluminum alloy profile 25 can be moved 200 (±2) mm in a single cycle, with a cycle every 25 to 30 seconds. The distance between the upper and lower front-to-back moving wheel groups 21 should be about 5 to 8 mm greater than the highest height of the profile.

[0055] After the sandblasting system 30 runs for 5 to 8 minutes (depending on the initial streaks or fine scratches on the surface), the sandblasting system 30 is turned off and the aging system 10 is restarted to keep the furnace temperature at 185 to 195°C to complete the subsequent aging work of 150 to 180 minutes.

[0056] <Technical Effects>

[0057] By combining the two traditional equipments for sandblasting and aging into one equipment, the process time is shortened. After the aluminum alloy profile is initially aged, light sandblasting is performed when the aluminum alloy profile has a certain hardness, which can effectively remove the surface defects of the aluminum alloy profile without causing the profile to bend. In the case of serious stripes or fine scratches on the surface of the aluminum alloy profile, enhanced sandblasting can be performed again at the end of aging, which can effectively eliminate the surface defects of the aluminum alloy profile. The aluminum alloy profile is in the material frame, and the wheel group moves back and forth in a small range, so that the aluminum alloy surface is sandblasted more evenly. The workshop area is reduced, energy consumption is reduced, and costs are reduced.

[0058] In the description of the present application, "multiple" means two or more than two, unless otherwise clearly and specifically defined. Unless otherwise clearly defined and defined, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances. Although the present invention has been described with reference to various specific embodiments, it should be understood that variations can be made within the spirit and scope of the described inventive concept. Therefore, it is intended that the present invention is not limited to the described embodiments, but will have the full scope defined by the language of the appended claims.

Claims

1. A sandblasting aging box furnace, characterized in that: include: A sand storage box (36) and a chamber (16) are connected via a lower sand pipe (37); a sand collection box (34) and a chamber (16) are connected via a sand drop hole (33) at the bottom of the chamber (16); a sand transport pipe (35) for connecting the sand collection box (34) and the sand storage box (36); a sand gun connected to the lower sand pipe (37) for spraying sand from the lower sand pipe (37) toward the inside of the chamber (16); a running roller group (14) arranged at the bottom of the chamber (16) to receive a material frame (20) sent into the chamber (16) via a furnace door (18); a power fan (38) for applying negative pressure to the sand storage box (36); a flamethrower (12) for heating the inside of the chamber (16); a fan port for blowing air to the inside of the chamber (16) to form an air heat cycle; and a windshield (15) arranged opposite to the flamethrower 12.

2. The sandblasting aging box furnace according to claim 1 is characterized in that: The material frame (20) comprises a plurality of vertical beams (23) on which rollers are rotatably mounted, and a layer of rollers for supporting the same profile (25) forms a forward and backward moving wheel set (21).

3. The sandblasting aging box furnace according to claim 2 is characterized in that: A vertical bar (22) for limiting the reciprocating movement range of the profile (25) is arranged on the crossbeam (24) of the material frame (20).

4. The sandblasting aging box furnace according to claim 2 is characterized in that: The roller surface of the front and rear moving wheel set (21) is provided with a layer of heat-resistant adhesive pad.

5. The sandblasting aging box furnace according to claim 1 is characterized in that: The sand storage box (36) is a closed chamber, and / or the sand gun comprises a downward sand gun (31) and an upward sand gun (32) which are arranged on the inner wall of the box chamber (16) and spray sand in different directions.

6. The sandblasting aging box furnace according to claim 1 is characterized in that: The fan port comprises a left fan port (11) for blowing air to the right and a right fan port (13) for blowing air to the left.

7. The sandblasting aging box furnace according to claim 1 is characterized in that: A double-chamber box structure is used, and the sand storage box (36) transports blasting sand to each chamber (16) respectively.

8. A sandblasting aging production process, characterized in that: The sandblasting aging box furnace according to any one of claims 1 to 7 comprises: The aging step includes: igniting and burning the flamethrower (12) to heat the air above the windshield (15), and blowing air from the fan port to realize the air heat circulation in the chamber (16); The sandblasting step comprises: starting a power fan (38), introducing sand from a sand storage box (36) into a lower sand pipe (37), spraying from a sand gun, and spraying the sand onto the surface of a profile (25) in a material frame (20), the rebounded sand falls from a box chamber (16) through a sand drop hole (33) into a sand collecting box (34), and the negative pressure in the sand storage box (36) sucks the sand in the sand collecting box (34) into the sand storage box (36) through a sand transport pipe (35), thereby realizing a cyclic operation of sandblasting.

9. The sandblasting aging production process according to claim 8, characterized in that: At least two adjacent steps selected from the group consisting of aging, sandblasting, aging, sandblasting, and aging are sequentially implemented.

10. The sandblasting aging production process according to claim 8, characterized in that: The combustion power of each flame spray gun (12) is 300,000 kcal, the air volume of each fan port is 1800-2000 m³ / h, and the single cycle time of switching the wind direction is 180-190 seconds. After the temperature of the chamber (16) rises to 190°C, it starts to keep warm. When the temperature drops to 185°C, the cycle heating is restarted. When the temperature rises to 195°C, the heating is stopped. The chamber (16) is kept between 185°C and 195°C. After keeping warm for 10-15 minutes, the flame spray gun (12) and the fan port are closed, and the power fan (38) is started. The wind pressure is 5-8 MPa. The wind pressure of the sand gun sandblasting is 2-2.5 MPa. The negative pressure inside the sand storage box (36) reaches 4-7 MPa. After the sandblasting operation is performed for 5-8 minutes, the sandblasting step is stopped, and the aging step is restarted. The chamber (16) continues to be kept at 185-195°C to complete the subsequent aging work of 150-180 minutes.

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