Punching device for casing of smoke exhaust fan

Abstract

The invention relates to the technical field of stamping equipment, and discloses a smoke exhaust fan shell stamping device which comprises a stamping machine, a lower die is fixedly connected to a stamping platform of the stamping machine, an upper base plate is fixedly connected to the stamping end of the stamping machine, and a horizontally-placed upper truss is slidably connected to the lower portion of the upper base plate; a driving device is further arranged on the lower portion of the upper base plate and used for driving the upper truss to move horizontally, a supporting arm is fixedly connected to one end of the bottom wall of the upper truss, one side of the supporting arm is fixedly connected to one end of the upper mold, a first baffle is further rotationally connected to the middle of the upper truss, and a torsional spring is arranged between the first baffle and the upper truss. And through the arrangement of the upper die, the stamping part can be electrically heated and preheated. According to the heating mode, rapid heating of the stamping part is achieved, effective preheating is provided for the follow-up laser welding procedure, the laser welding effect can be improved, and meanwhile internal stress generated by curling stamping can be eliminated.

Description

Technical Field

[0001] The invention relates to the technical field of stamping equipment, and in particular to a stamping device for a smoke exhaust fan casing. Background Art

[0002] The traditional stretching and stamping process has always been a commonly used processing method. However, in the field of manufacturing smoke exhaust fan casings, the national standard has specific requirements for the wall thickness of smoke exhaust fan casings. When the traditional stretching and stamping process is used to stamp a stamped part with a certain thickness, it is easy to cause uneven casing wall thickness, affecting the overall performance and quality of the casing, and even causing the casing to deform, crack, and other problems during use, affecting its service life and safety.

[0003] The circular curling stamping process requires an additional welding process after stamping, which undoubtedly increases the manufacturing process and reduces efficiency. In addition, after the circular curling stamping, the stamping parts are prone to re-expansion and distortion due to stress, which affects the subsequent welding process. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a stamping device for a smoke exhaust fan casing, which solves the problems caused by replacing the traditional stretching stamping process with a circular curling stamping process.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a smoke exhaust fan casing stamping device, including a stamping machine, a lower mold is fixedly connected to the stamping platform of the stamping machine, and an upper base plate is fixedly connected to the stamping end of the stamping machine. The lower part of the upper base plate is slidably connected to a horizontally placed upper truss, and a driving device is also provided at the lower part of the upper base plate for driving the upper truss to move horizontally. One end of the bottom wall of the upper truss is fixedly connected to a support arm, and one side of the support arm is fixedly connected to one end of the upper mold. A baffle plate 1 is also rotatably connected to the middle part of the upper truss, and a torsion spring is provided between the baffle plate 1 and the upper truss, and the baffle plate 1 is kept in a vertical state by the torsion spring. A heating circuit is connected in series between the baffle plate 1 and the upper mold. When the baffle plate 1 contacts the upper mold, the heating circuit is in a short-circuit state. When the baffle plate 1 contacts the outer surface of the stamping part and the upper mold contacts the inner surface of the stamping part, the stamping part forms a resistor in the heating circuit and is powered on for heating. A laser welding device is also provided on the upper truss for welding the stamping part.

[0006] Preferably, the driving device includes a motor, the outer wall of the motor is fixedly connected to one side of the upper base plate, the output end of the motor is fixedly connected to a screw rod, a slide groove is opened at the lower part of the upper base plate, the top of the upper truss is slidably connected in the slide groove, the two ends of the screw rod are respectively rotatably connected to the two inner walls of the slide groove, and the threaded end of the screw rod passes through and is threadedly connected to the top of the upper truss.

[0007] Preferably, the lower mold includes a bottom plate, the bottom wall of the bottom plate is fixedly connected to the stamping platform of the stamping machine, symmetrically arranged bases are fixedly connected on both sides of the upper surface of the bottom plate, and the two bases are rotatably connected to the lower modules on opposite sides, a top block is arranged between the two bases, and the top block is located below the two lower modules, a top rod is fixedly connected to the bottom wall of the top block, and the outer wall of the top rod passes through and is slidably connected to the middle part of the bottom plate, a spring is arranged between the top block and the bottom plate, and the spring is sleeved on the outer wall of the top rod.

[0008] Preferably, the upper mold includes an inner core column, one end of which is fixedly connected to one side of the support arm, an outer sleeve is arranged between the support arm and baffle one, the inner wall of the outer sleeve is sleeved on and slidably connected to the outer wall of the inner core column, a slot is provided on the top of the outer sleeve, the width of the slot is greater than the width of baffle one, and baffle two is fixedly connected to the outer sleeve close to the support arm.

[0009] Preferably, the inner core column is electrically connected to one electrode of the heating circuit, the baffle 1 is electrically connected to another electrode of the heating circuit, the outer sleeve is a conductor, and the upper truss is an insulator.

[0010] Preferably, electromagnet 1 is provided in the support arm, and electromagnet 2 is provided in baffle 2. When electromagnet 1 and electromagnet 2 are connected with currents in opposite directions, the support arm and baffle 2 are magnetically attracted to each other. When electromagnet 1 and electromagnet 2 are connected with currents in the same direction, the support arm and baffle 2 are magnetically repelled from each other.

[0011] Preferably, a baffle three is fixedly connected to one side of the bottom plate close to the support arm, and a groove is formed between the baffle three and the lower module for the baffle two to be embedded.

[0012] Preferably, a cleaning brush is also provided on one side of the bottom end of the baffle, and the cleaning brush is used to clean impurities at the part of the stamping part to be welded.

[0013] The present invention provides a stamping device for a smoke exhaust fan casing. It has the following beneficial effects:

[0014] The present invention effectively solves the problem that the stretching stamping process is not applicable due to the wall thickness requirements by converting the traditional stretching stamping process into a circular curling stamping process. The steel plate is subjected to circular curling stamping by utilizing the unique cooperation of the lower die and the upper die. The upper die is driven downward by the punching machine to drive the steel plate to be embedded in the lower die, so as to realize the curling operation of the steel plate and form a cylindrical structure that meets the requirements, thereby ensuring the wall thickness uniformity and dimensional accuracy of the smoke exhaust fan casing and meeting the industry's specific requirements for the wall thickness of the smoke exhaust fan casing. After the stamping operation is completed, the stamping parts can be preheated by electric heating through the setting of the upper die. This heating method not only realizes the rapid heating of the stamping parts, provides effective preheating for the subsequent laser welding process, but also helps to improve the effect of laser welding, and at the same time can eliminate the internal stress generated by curling stamping. By eliminating the internal stress, the quality problems caused by the residual stress in the smoke exhaust fan casing, such as deformation, cracking, etc., are avoided, the structural stability and reliability of the casing are ensured, thereby improving the overall quality and service life of the smoke exhaust fan casing. It realizes the effect of automatic welding after stamping and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a front perspective view of a stamping device for a smoke exhaust fan casing of the present invention;

[0016] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0017] Figure 3 A rear perspective view of a stamping device for a smoke exhaust fan casing according to the present invention;

[0018] Figure 4 It is a three-dimensional structural schematic diagram of the lower mold and the upper mold in the present invention;

[0019] Figure 5 It is a structural schematic diagram of the upper mold in the present invention;

[0020] Figure 6 It is a structural schematic diagram of the lower mold in the present invention;

[0021] Figure 7 It is a schematic structural diagram of the upper substrate in the present invention;

[0022] Figure 8 It is a schematic diagram of the position of the cleaning brush in the present invention.

[0023] Among them, 1. stamping machine; 2. lower mold; 201. bottom plate; 202. base; 203. lower module; 204. top block; 205. top rod; 206. spring; 207. baffle three; 3. upper base plate; 301. slide groove; 4. upper truss; 5. support arm; 501. electromagnet one; 6. upper mold; 601. inner core column; 602. outer sleeve; 6021. slot; 603. baffle two; 6031. electromagnet two; 7. baffle one; 8. laser welding equipment; 9. motor; 10. screw rod; 11. cleaning brush. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Please refer to the attached Figure 1 -Attached Figure 8 The embodiment of the present invention provides a smoke exhaust fan casing stamping device, including a stamping machine 1, a lower mold 2 is fixedly connected to the stamping platform of the stamping machine 1, an upper base plate 3 is fixedly connected to the stamping end of the stamping machine 1, a horizontally placed upper truss 4 is slidably connected to the lower part of the upper base plate 3, and a driving device is also provided at the lower part of the upper base plate 3 for driving the upper truss 4 to move horizontally, a support arm 5 is fixedly connected to one end of the bottom wall of the upper truss 4, one side of the support arm 5 is fixedly connected to one end of the upper mold 6, and the middle part of the upper truss 4 is also rotatably connected to the upper truss 4. A baffle 7 is connected, and a torsion spring is arranged between the baffle 7 and the upper truss 4. The torsion spring keeps the baffle 7 in a vertical state. A heating circuit is connected in series between the baffle 7 and the upper mold 6. When the baffle 7 contacts the upper mold 6, the heating circuit is in a short-circuit state. When the baffle 7 contacts the outer surface of the stamping part and the upper mold 6 contacts the inner surface of the stamping part, the stamping part forms a resistor in the heating circuit and is powered on for heating. A laser welding device 8 is also arranged on the upper truss 4 for welding the stamping parts.

[0026] For the smoke exhaust fan casing, the industry has certain requirements for its wall thickness, and for this required wall thickness, the traditional stretching and stamping process is difficult to apply. Therefore, a non-stretching stamping process is adopted in this embodiment, that is, the steel plate is subjected to circular curling and stamping, and the upper mold 6 is driven downward by the punching machine 1, thereby driving the steel plate to be embedded in the lower mold 2. With the cooperation of the two, the steel plate is curled to form a cylindrical structure. At this time, the baffle 7 is in contact with the upper mold 6, and the heating circuit is in a short-circuit state. After the stamping is completed, the driving device drives some components in the upper mold 6 to move, and the baffle 7 is in contact with the outer surface of the stamping part, and the upper mold 6 is in contact with the inner surface of the stamping part. At this time, the stamping part forms a resistor in the heating circuit, which is powered on for heating, thereby preheating the stamping part and driving the laser welding equipment 8 to perform laser welding on the stamping part.

[0027] Through the cooperation of the lower mold 2 and the upper mold 6, the traditional stretching stamping process is transformed into a circular curling stamping, thereby solving the problem that the wall thickness of the smoke exhaust fan casing is not suitable for the stretching stamping process. Through the setting of the upper mold 6, after completing the stamping of the smoke exhaust fan casing, the stamping parts are preheated by electric heating. On the one hand, this heating method realizes the rapid heating of the stamping parts, and then realizes the preheating process before laser welding, which helps to improve the effect of subsequent laser welding; on the other hand, the heating of the stamping parts eliminates the internal stress generated by curling stamping, avoiding the quality problems caused by the residual stress in the smoke exhaust fan casing, and also avoiding the influence of internal stress on subsequent laser welding.

[0028] The driving device includes a motor 9, the outer wall of the motor 9 is fixedly connected to one side of the upper base plate 3, the output end of the motor 9 is fixedly connected to a screw rod 10, a slide groove 301 is opened at the lower part of the upper base plate 3, the top of the upper truss 4 is slidably connected in the slide groove 301, the two ends of the screw rod 10 are respectively rotatably connected to the two inner side walls of the slide groove 301, and the threaded end of the screw rod 10 passes through and is threadedly connected to the top of the upper truss 4.

[0029] The motor 9 drives the screw rod 10 to rotate, thereby driving the upper truss 4 to slide along the slide groove 301 .

[0030] The lower die 2 comprises a bottom plate 201, the bottom wall of the bottom plate 201 is fixedly connected to the punching platform of the punching machine 1, the upper surface of the bottom plate 201 is fixedly connected with symmetrically arranged bases 202 on both sides, the two bases 202 are rotatably connected with the lower modules 203 on opposite sides, a top block 204 is arranged between the two bases 202, the top block 204 is located below the two lower modules 203, a top rod 205 is fixedly connected to the bottom wall of the top block 204, the outer wall of the top rod 205 penetrates and is slidably connected to the middle of the bottom plate 201, a spring 206 is arranged between the top block 204 and the bottom plate 201, and the spring 206 is sleeved on the outer wall of the top rod 205. A baffle plate 3 207 is fixedly connected to the side of the bottom plate 201 close to the support arm 5, and a groove is formed between the baffle plate 3 207 and the lower module 203 for the baffle plate 2 603 to be embedded.

[0031] The upper mold 6 includes an inner core column 601, one end of which is fixedly connected to one side of the support arm 5, an outer sleeve 602 is arranged between the support arm 5 and the baffle 1 7, the inner wall of the outer sleeve 602 is sleeved and slidably connected to the outer wall of the inner core column 601, a slot 6021 is provided on the top of the outer sleeve 602, the width of the slot 6021 is greater than the width of the baffle 1 7, and a baffle 2 603 is fixedly connected to the side of the outer sleeve 602 close to the support arm 5. The inner core column 601 is electrically connected to one electrode of the heating circuit, the baffle 1 7 is electrically connected to the other electrode of the heating circuit, the outer sleeve 602 is a conductor, and the upper truss 4 is an insulator. An electromagnet 1 501 is arranged in the support arm 5, and an electromagnet 2 6031 is arranged in the baffle 2 603. When the electromagnet 1 501 and the electromagnet 2 6031 are connected with currents in opposite directions, the support arm 5 and the baffle 2 603 are magnetically attracted to each other. When the electromagnet 1 501 and the electromagnet 2 6031 are connected with currents in the same direction, the support arm 5 and the baffle 2 603 are magnetically repelled from each other.

[0032] When stamping, the steel plate to be stamped is placed on the lower module 203, and the hydraulic press 1 drives the upper mold 6 to press down. When the lowest end of the baffle plate 2 603 is below the highest end of the lower module 203, the electromagnet 1 501 and the electromagnet 2 6031 are connected to the same direction of current, and the support arm 5 and the baffle plate 2 603 magnetically repel each other, so that the baffle plate 2 603 moves down close to the side wall of the lower module 203, and the upper mold 6 continues to press down to press the steel plate into the lower module 203. During this process, the baffle plate 2 603 is embedded in the groove formed between the baffle plate 3 207 and the lower module 203, so that the outer sleeve 602 is limited and fixed in the horizontal direction. At the same time, the bottom of the lower module 203 is pressed to cause the lower module 203 to rotate, and the two pairs of The lower module 203 of the scale is close to each other, and the filling of the upper mold 6 is coordinated to make the steel plate curl around the outer wall of the outer sleeve 602 to form a cylindrical structure, completing the stamping step. Under the limitation of baffle 2 603 and baffle 1 7, the horizontal position of the stamped steel plate is bidirectionally restricted to avoid its displacement during the stamping process; after the stamping is completed, the motor 9 drives the screw 10 to rotate, thereby driving the upper truss 4 to slide along the slide groove 301, so that the baffle 1 7 moves toward the stamped steel cylinder and contacts the surface of the steel cylinder. At this time, the steel cylinder (stamped part) forms a resistor in the heating circuit, which is powered on for heating, thereby preheating the stamped part. The upper truss 4 continues to move, so that the laser welding equipment 8 moves to the weld for laser welding. After welding is completed, the motor 9 drives the upper truss 4 to move in the opposite direction, so that the baffle 2 603 contacts the support arm 5. At this time, the electromagnet 1 501 and the electromagnet 2 6031 are connected with out-of-phase current, and the support arm 5 and the baffle 2 603 are magnetically attracted to each other. The stamping machine 1 drives the upper mold 6 to rise, and the pressure on the lower module 203 is eliminated. The top block 204 is expanded again under the action of the spring 206, and the welded stamping parts can be taken out from the lower mold 2. Since the stamping parts are heated, the principle of thermal expansion and contraction is used to make the stamping parts expand slightly. At this time, the stamping parts can be quickly pulled out from the upper mold 6. Of course, the expansion coefficients of the inner core column 601 and the outer sleeve 602 are much smaller than the expansion coefficient of the stamping parts.

[0033] A cleaning brush 11 is also provided on one side of the bottom end of the baffle 7, and the cleaning brush 11 is used to clean impurities at the part to be welded of the stamping part.

[0034] By providing the cleaning brush 11, the weld of the stamping part is cleaned of impurities before welding, thereby further improving the welding quality.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A smoke exhaust fan casing stamping device, comprising a stamping machine (1), characterized in that: The punching platform of the punching machine (1) is fixedly connected to a lower mold (2), the punching end of the punching machine (1) is fixedly connected to an upper base plate (3), the lower part of the upper base plate (3) is slidably connected to a horizontally placed upper truss (4), the lower part of the upper base plate (3) is also provided with a driving device for driving the upper truss (4) to move horizontally, one end of the bottom wall of the upper truss (4) is fixedly connected to a support arm (5), one side of the support arm (5) is fixedly connected to one end of the upper mold (6), and the middle part of the upper truss (4) is also rotatably connected to a baffle plate (7). A torsion spring is provided between the baffle plate 1 (7) and the upper truss (4), and the baffle plate 1 (7) is kept in a vertical state by the torsion spring. A heating circuit is connected in series between the baffle plate 1 (7) and the upper mold (6). When the baffle plate 1 (7) contacts the upper mold (6), the heating circuit is in a short-circuit state. When the baffle plate 1 (7) contacts the outer surface of the stamping part, and the upper mold (6) contacts the inner surface of the stamping part, the stamping part forms a resistor in the heating circuit and is electrically heated. A laser welding device (8) is also provided on the upper truss (4) for welding the stamping part.

2. A smoke exhaust fan casing stamping device according to claim 1, characterized in that: The driving device comprises a motor (9), the outer wall of the motor (9) is fixedly connected to one side of the upper base plate (3), the output end of the motor (9) is fixedly connected to a screw rod (10), a slide groove (301) is provided at the lower part of the upper base plate (3), the top of the upper truss (4) is slidably connected in the slide groove (301), the two ends of the screw rod (10) are respectively rotatably connected to the two inner side walls of the slide groove (301), and the threaded end of the screw rod (10) passes through and is threadedly connected to the top of the upper truss (4).

3. A smoke exhaust fan casing stamping device according to claim 1, characterized in that: The lower mold (2) comprises a bottom plate (201), the bottom wall of the bottom plate (201) is fixedly connected to the punching platform of the punching machine (1), symmetrically arranged bases (202) are fixedly connected to the two sides of the upper surface of the bottom plate (201), the two bases (202) are rotatably connected to the lower modules (203) on opposite sides, a top block (204) is arranged between the two bases (202), the top block (204) is located below the two lower modules (203), the bottom wall of the top block (204) is fixedly connected to a push rod (205), the outer wall of the push rod (205) passes through and is slidably connected to the middle part of the bottom plate (201), a spring (206) is arranged between the top block (204) and the bottom plate (201), and the spring (206) is sleeved on the outer wall of the push rod (205).

4. A smoke exhaust fan casing stamping device according to claim 3, characterized in that: The upper mold (6) comprises an inner core column (601), one end of which is fixedly connected to one side of the support arm (5); an outer sleeve (602) is arranged between the support arm (5) and the baffle plate 1 (7); the inner wall of the outer sleeve (602) is sleeved on and slidably connected to the outer wall of the inner core column (601); a slot (6021) is provided on the top of the outer sleeve (602); the width of the slot (6021) is greater than the width of the baffle plate 1 (7); and the outer sleeve (602) is fixedly connected to the baffle plate 2 (603) on the side close to the support arm (5).

5. A smoke exhaust fan casing stamping device according to claim 4, characterized in that: The inner core column (601) is electrically connected to an electrode of the heating circuit, the baffle plate (7) is electrically connected to another electrode of the heating circuit, the outer sleeve (602) is a conductor, and the upper truss (4) is an insulator.

6. A smoke exhaust fan casing stamping device according to claim 4, characterized in that: The support arm (5) is provided with an electromagnet 1 (501), and the baffle plate 2 (6031) is provided with an electromagnet 2 (6031). When the electromagnet 1 (501) and the electromagnet 2 (6031) are connected with out-of-phase current, the support arm (5) and the baffle plate 2 (603) are magnetically attracted to each other. When the electromagnet 1 (501) and the electromagnet 2 (6031) are connected with in-phase current, the support arm (5) and the baffle plate 2 (603) are magnetically repelled from each other.

7. A smoke exhaust fan casing stamping device according to claim 5, characterized in that: A baffle plate three (207) is fixedly connected to one side of the bottom plate (201) close to the support arm (5), and a groove is formed between the baffle plate three (207) and the lower module (203) for the baffle plate two (603) to be embedded.

8. The smoke exhaust fan casing stamping device according to claim 1, characterized in that: A cleaning brush (11) is also provided on one side of the bottom end of the baffle plate 1 (7), and the cleaning brush (11) is used to clean impurities at the part of the stamping part to be welded.

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