A plastic bending process for explosion-proof switch processing

Abstract

The present invention relates to the field of plastic molding technology, and specifically to a plastic bending process for processing explosion-proof switches. Obtain a target angle of a V-shaped plastic plate, determine a first angle range based on the target angle, select a first preset angle based on the first angle range, and use a corresponding mold to produce a V-shaped plastic plate with a first preset angle. The V-shaped plastic plate enters a first pressing plate mechanism and a second pressing plate mechanism and is clamped. The bending part of the V-shaped plastic plate is heated by a heating device, and the first pressing plate mechanism and the second pressing plate mechanism are rotated to drive the heated V-shaped plastic plate to bend, and then move out after molding. The present invention provides a plastic bending process for processing explosion-proof switches to solve the problem that the existing plastic bending equipment generally adopts single-sided heating at the bending part, and one side is pulled and the other side is compressed when bending the plate, resulting in inconsistent deformation on both sides.

Description

Technical Field

[0001] The invention relates to the technical field of plastic molding, and in particular to a plastic bending process for processing explosion-proof switches. Background Art

[0002] Plastic bending technology is a process of forming the required angle and shape of plastic materials at specific locations through certain methods and technical means. Common plastic bending processes include hot bending, cold bending and mechanical bending. The hot bending method is to place the plastic hollow plate in a hot plate or oven to heat it. When the plastic becomes soft, it is quickly taken out and bent into the required shape. The cold bending method is to fix the plastic hollow plate in a mold of the required shape, and then cool it to solidify and maintain the required shape. The mechanical bending method is to use appropriate mechanical equipment, such as bending machines, bending machines, etc. to bend the plastic hollow plate into the required shape. Explosion-proof switch is a special electrical switch device used in hazardous environments. The plastic parts of the explosion-proof switch need to be bent and processed during production.

[0003] For example, the Chinese patent with the authorization announcement number CN109177123B provides a plastic plate heating and bending mechanism. The present invention relates to the technical field of plastic plate bending devices, specifically a plastic plate heating and bending mechanism, including a fixed base, a baffle, a pressing mechanism, a telescopic mechanism, a fixing mechanism, a heating mechanism and a rotating mechanism, which can be used to control the bending angle and the bending length. However, the plastic bending equipment adopts a method of heating the single-sided bending part, and bends the bending part before it cools down and has good plasticity. However, when bending the plate, one side is pulled and the other side is compressed, resulting in inconsistent deformation on both sides, and the larger the bending angle, the greater the deformation difference, which leads to a series of quality problems. Summary of the invention

[0004] The invention provides a plastic bending process for processing explosion-proof switches to solve the problem that the existing plastic bending equipment generally adopts heating at the bending part on one side, and when the plate is bent, one side is pulled and the other side is compressed, resulting in inconsistent deformation of the two sides.

[0005] The invention discloses a plastic bending process for processing explosion-proof switches, which adopts the following technical scheme: A plastic bending process for processing explosion-proof switches comprises the following steps:

[0006] S100: Acquire a target angle of the V-shaped plastic plate, determine a first angle range according to the target angle, select a first preset angle according to the first angle range, and produce a V-shaped plastic plate of the first preset angle using a corresponding mold.

[0007] S200: Clamping, the V-shaped plastic plate of the first preset angle is matched with the bending device corresponding to the first preset angle, and the V-shaped plastic plate enters the first pressing plate mechanism and the second pressing plate mechanism and is clamped.

[0008] S300: Heating: heating the bending part of the V-shaped plastic plate by a heating device to soften it.

[0009] S400: Bending: rotating the first pressing plate mechanism and the second pressing plate mechanism to drive the heated V-shaped plastic plate to perform a bending action, and bending the V-shaped plastic plate to a target angle.

[0010] S500: Molding: the bent V-shaped plastic plate is left to cool down and then formed.

[0011] S600: Moving out: moving the formed V-shaped plastic plate out of the bending device.

[0012] Furthermore, there are multiple molds in step 100, each mold is in a V-shape with a first preset angle, the target angle of the V-shaped plastic plate is obtained, the first angle range is determined according to the target angle, and the first preset angle is selected according to the first angle range, and finally the corresponding mold is selected according to the first preset angle.

[0013] Furthermore, each series of bending devices has a different first angle range allowed for bending, and the initial angle of the bending device is a first preset angle.

[0014] Furthermore, the first preset angle is slightly larger than a middle value of a first angle range allowed for bending by the corresponding bending device.

[0015] Furthermore, the target angle is any angle within the first angle range allowed for bending by each bending device.

[0016] Furthermore, the first platen mechanism includes a first curved plate, and the second platen mechanism includes a second curved plate. The first curved plate and the second curved plate in each bending device have different first angle ranges of allowed bending. In the initial state, the angle between the first curved plate and the second curved plate is a first preset angle.

[0017] Furthermore, in step S200, the second pressing plate mechanism is moved closer to the first pressing plate mechanism through the pushing mechanism.

[0018] Furthermore, the heating mechanism in step S300 includes a first heating mechanism and a second heating mechanism, the first heating mechanism is used to heat the first curved plate, and the second heating mechanism is used to heat the second curved plate.

[0019] Furthermore, a dial is provided on the bending device.

[0020] Furthermore, the arc lengths of the first curved plate and the second curved plate are lengths corresponding to a first angle range allowed by the bending device when the bending angle range is maximum.

[0021] The beneficial effects of the present invention are as follows: the plastic bending process for processing explosion-proof switches of the present invention uses a series of discrete bending devices in a first angle range to produce V-shaped plastic plates with continuous angles, thereby reducing the strain of the V-shaped plastic plates.

[0022] Different series of bending devices have different first angle ranges allowed for bending, and the first preset angle is slightly larger than the middle value of the first angle range allowed for bending by the corresponding bending device, ensuring that when all series of V-shaped plastic plates are bent, the maximum strain generated on both sides of the V-shaped plastic plates is consistent, further ensuring the quality of the V-shaped plastic plates.

[0023] The first heating mechanism and the second heating mechanism of the present invention make the heating area more clear, avoiding frequent adjustment of the bending area. In addition, the first pressing plate mechanism and the second pressing plate mechanism support the plastic during bending, further reducing deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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 described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0025] Figure 1 It is a flow chart of an embodiment of a plastic bending process for processing explosion-proof switches of the present invention;

[0026] Figure 2 It is a structural schematic diagram of an embodiment of a plastic bending process for processing an explosion-proof switch of the present invention;

[0027] Figure 3 It is a partial structural schematic diagram of an embodiment of a plastic bending process for processing an explosion-proof switch of the present invention;

[0028] Figure 4 It is a front view of an embodiment of a plastic bending process for processing an explosion-proof switch of the present invention;

[0029] Figure 5 The figure is a schematic diagram of the working state of an embodiment of a plastic bending process for processing explosion-proof switches of the present invention.

[0030] In the figure: 210, first pressing plate mechanism; 211, first connecting plate; 212, first curved plate; 213, second connecting plate; 220, first heating mechanism; 221, heating plate; 230, buckle plate; 240, handle; 310, second pressing plate mechanism; 311, third connecting plate; 312, second curved plate; 313, fourth connecting plate; 314, first protruding rod; 320, second heating mechanism; 321, second cylinder; 322, first cylinder; 330, crank handle. DETAILED DESCRIPTION

[0031] 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.

[0032] An embodiment of a plastic bending process for processing an explosion-proof switch of the present invention is as follows: Figures 1 to 5 As shown, a plastic bending process for explosion-proof switch processing includes the following steps:

[0033] S100: Obtain the target angle of the V-shaped plastic plate, determine the first angle range according to the target angle, select the first preset angle according to the first angle range, and use the corresponding mold to produce the V-shaped plastic plate with the first preset angle. Set the target angle to 135°, determine the first angle range to be 120°-140°, and further determine the first preset angle to be 131°. Select the mold with the first preset angle of 131° to produce the V-shaped plastic plate with the first preset angle of 131°. Or set the target angle to 150°, determine the first angle range to be 140°-156°, and further determine the first preset angle to be 149°. Select the mold with the first preset angle of 149° to produce the V-shaped plastic plate with the first preset angle of 149°.

[0034] S200: Clamping, the V-shaped plastic plate of the first preset angle is matched with the bending device corresponding to the first preset angle, and the V-shaped plastic plate enters the first pressing plate mechanism 210 and the second pressing plate mechanism 310 and is clamped.

[0035] S300: Heating: heating the bending part of the V-shaped plastic plate by a heating device to soften it.

[0036] S400: Bending: rotating the first pressing plate mechanism 210 and the second pressing plate mechanism 310 to drive the heated V-shaped plastic plate to bend the V-shaped plastic plate to a target angle.

[0037] S500: Molding: the bent V-shaped plastic plate is left to cool down and then formed.

[0038] S600: Moving out: moving the formed V-shaped plastic plate out of the bending device.

[0039] In this embodiment, there are multiple molds in step 100, each mold is in a V-shape with a first preset angle, the target angle of the V-shaped plastic plate is obtained, the first angle range is determined according to the target angle, and the first preset angle is selected according to the first angle range, and finally the corresponding mold is selected according to the first preset angle.

[0040] In this embodiment, each series of bending devices has a different first angle range allowed for bending, and the initial angle of the bending device is a first preset angle.

[0041] In this embodiment, the first preset angle is slightly larger than the middle value of the first angle range allowed to be bent by the corresponding bending device. Assuming that the A series bending device is used to produce a V-shaped plastic plate with a first angle range continuously changing from 120°-140°, it is necessary to set the first preset angle of the A series to an angle slightly larger than 130°, such as 131°, so that the maximum strain generated when the V-shaped plastic plate is bent to 120° and 140° is consistent. At the same time, the B series is used to produce a V-shaped plastic plate with a first angle range continuously changing from 140°-156°, and it is necessary to set the first preset angle of the B series to an angle slightly larger than 148°, such as 149°. Similarly, the C series is used to produce a V-shaped plastic plate with a first angle range continuously changing from 156°-168°, and it is necessary to set the first preset angle of the C series to an angle slightly larger than 162°, such as 163°. Moreover, a series of bending devices with discrete first angle ranges are used to produce V-shaped plastic plates with continuous angles, which reduces the strain of the V-shaped plastic plates.

[0042] The strain generated by bending the same V-shaped plastic plate in the direction of increasing angle is greater than the strain generated by bending in the direction of decreasing angle. When V-shaped plastic plates with different initial angles are bent in the same direction at the same angle, the strain generated by the V-shaped plastic plate with a larger initial angle is greater. The first preset angle is set to ensure that the maximum strain generated on both sides of the V-shaped plastic plate is consistent when all series of V-shaped plastic plates are bent, further ensuring the quality of the V-shaped plastic plate.

[0043] In this embodiment, the target angle is any angle within the first angle range allowed by each bending device. For example, if the first angle range of a bending device is 120°-140°, the target angle is any angle within 120°-140°, such as 135°, 136°, etc.

[0044] In this embodiment, if Figure 3 and Figure 4As shown, the first platen mechanism 210 includes a first curved plate 212, and the second platen mechanism 310 includes a second curved plate 312. The first curved plate 212 and the second curved plate 312 are both arc-shaped, and the first curved plate 212 and the second curved plate 312 in each bending device have different first angle ranges allowed for bending. In the initial state, the angle of the first curved plate 212 and the second curved plate 312 is a first preset angle. The bending range allowed for the first curved plate 212 and the second curved plate 312 in each bending device is a first angle range, for example, the first preset angle of the first curved plate 212 and the second curved plate 312 is 131°, and the first angle range of the first curved plate 212 and the second curved plate 312 is 120°-140°.

[0045] Specifically, the first pressing plate mechanism 210 includes a first connecting plate 211, a first curved plate 212, and a second connecting plate 213. The first connecting plate 211 is horizontally arranged, the cross section of the first curved plate 212 is a curve, and the lower side of the first curved plate 212 is connected to one side of the first connecting plate 211. The second connecting plate 213 is inclinedly arranged, and the projection of the cross section of the second connecting plate 213 forms an angle with the horizontal line. The lower side of the second connecting plate 213 is connected to the upper side of the first curved plate 212.

[0046] The second pressing plate mechanism 310 includes a third connecting plate 311, a second curved plate 312, and a fourth connecting plate 313. The third connecting plate 311 is horizontally arranged, and the third connecting plate 311 is above the first connecting plate 211. The cross section of the second curved plate 312 is a curve, and the lower side of the second curved plate 312 is connected to one side of the first connecting plate 211. The fourth connecting plate 313 is inclined, and the projection of the cross section of the fourth connecting plate 313 forms an angle with the horizontal line. The lower side of the fourth connecting plate 313 is connected to the upper side of the second curved plate 312.

[0047] The V-shaped plastic plate is placed into the V-shaped space formed by the first pressing plate mechanism 210 and the second pressing plate mechanism 310 .

[0048] In this embodiment, in step S200, the second pressing plate mechanism 310 is moved closer to the first pressing plate mechanism 210 by the pushing mechanism. Specifically, the pushing mechanism includes a crank 330 and a first protruding rod 314, one end of the first protruding rod 314 is connected to the third connecting plate 311, a threaded groove is provided on the peripheral wall of the first protruding rod 314, the crank 330 is sleeved on the first protruding rod 314, and the crank 330 and the first protruding rod 314 are threadedly matched.

[0049] The bending device further includes a gusset plate 230 and two first cylinders 322. One side of the gusset plate 230 is hinged to the first connecting plate 211, and the gusset plate 230 has a first position and a second position. When the gusset plate 230 is in the first position, the gusset plate 230 is separated from the fourth connecting plate 313, and when the gusset plate 230 is in the second position, the gusset plate 230 is in contact with the fourth connecting plate 313.

[0050] The first cylinder 322 is arranged horizontally, and one end of one first cylinder 322 is fixedly connected to one end of the third connecting plate 311 and one end of the fourth connecting plate 313. One end of another first cylinder 322 is fixedly connected to the other end of the third connecting plate 311 and the other end of the fourth connecting plate 313.

[0051] After the V-shaped plastic plate is put into the first pressing plate mechanism 210 and the second pressing plate mechanism 310, the crank 330 is turned. Under the action of the crank 330, the first protruding rod 314 moves, thereby pushing the second pressing plate mechanism 310 closer to the first pressing plate mechanism 210. When the first cylinder 322 and the second curved plate 312 are in contact, the crank 330 is stopped from being turned. The first cylinder 322 is used for positioning to prevent the V-shaped plastic plate from being damaged due to excessive pushing of the second pressing plate mechanism 310. Then, the buckle plate 230 is turned to put the buckle plate 230 in the second position. At this time, the buckle plate 230 is in contact with the fourth connecting plate 313, thereby clamping the V-shaped plastic plate, preventing the second pressing plate mechanism 310 from moving and then loosening the V-shaped plastic plate, which is not conducive to the later processing of the V-shaped plastic plate.

[0052] In this embodiment, if Figure 4 As shown, the heating mechanism in step S300 includes a first heating mechanism 220 and a second heating mechanism 320 . The first heating mechanism 220 is used to heat the first curved plate 212 , and the second heating mechanism 320 is used to heat the second curved plate 312 .

[0053] The first heating mechanism 220 includes a heating plate 221 , and an inner side surface of the heating plate 221 abuts against an outer side surface of the first curved plate 212 .

[0054] The second heating mechanism 320 includes a second cylinder 321 . Two ends of the second cylinder 321 are respectively connected to the two first cylinders 322 , and the outer peripheral wall of the second cylinder 321 abuts against the inner side surface of the second curved plate 312 .

[0055] After the V-shaped plastic plate is clamped, the heating plate 221 heats the first curved plate 212, thereby heating the outer side of the V-shaped plastic plate. The second cylinder 321 is heated, and the second cylinder 321 heats the second curved plate 312, thereby heating the inner side of the V-shaped plastic plate.

[0056] In this embodiment, a dial is provided on the first pressing plate mechanism 210. In step S400, a handle 240 is provided on the first pressing plate mechanism 210. The first pressing plate mechanism 210 is rotated by holding the handle 240, and the second pressing plate mechanism 310 and the heated V-shaped plastic plate are driven to bend synchronously. When bending, the angle of the V-shaped plastic plate is bent to the target angle by aligning the degree on the dial.

[0057] In other embodiments, a gear ring is fixedly provided at one end of the second connecting plate, a motor is provided on the bending device, a gear is provided on the output shaft of the motor, and the gear and the gear ring are meshed. The rotation of the motor drives the gear to rotate, and then drives the gear ring to rotate, so that the first pressing plate mechanism rotates. The speed of the motor is set, for example, when the motor rotates one circle, it drives the first pressing plate mechanism to rotate 0.1 degrees, so that more precise bending can be achieved.

[0058] In this embodiment, the arc lengths of the first curved plate 212 and the second curved plate 312 are lengths corresponding to the maximum first angle range allowed by the bending device.

[0059] Working process: Obtain the target angle of the V-shaped plastic plate, determine the first angle range according to the target angle, select the first preset angle according to the first angle range, and use the corresponding mold to produce the V-shaped plastic plate with the first preset angle. Set the target angle to 135°, determine the first angle range to be 120°-140°, and further determine the first preset angle to be 131°. Select the mold with the first preset angle of 131° to produce the V-shaped plastic plate with the first preset angle of 131°. Put the V-shaped plastic plate into the V-shaped space formed by the first pressing plate mechanism 210 and the second pressing plate mechanism 310. Turn the crank 330, and under the action of the crank 330, the first protruding rod 314 moves, thereby pushing the second pressing plate mechanism 310 closer to the first pressing plate mechanism 210. When the first cylinder 322 and the second curved plate 312 are in contact, stop turning the crank 330. The first cylinder 322 is used for positioning to prevent the V-shaped plastic plate from being damaged due to excessive pushing of the second pressing plate mechanism 310. Then, the pinch plate 230 is rotated to be in the second position, at which time the pinch plate 230 contacts the fourth connecting plate 313, thereby clamping the V-shaped plastic plate.

[0060] After the V-shaped plastic plate is clamped, the heating plate 221 heats the first curved plate 212, thereby heating the outer side of the V-shaped plastic plate. The second cylinder 321 is heated, and the second cylinder 321 heats the second curved plate 312, thereby heating the inner side of the V-shaped plastic plate. After the bending part of the V-shaped plastic plate is softened, the first pressing plate mechanism 210 is rotated by holding the handle 240, and the second pressing plate mechanism 310 and the heated V-shaped plastic plate are synchronously bent, and the angle of the V-shaped plastic plate is bent to the target angle by aligning the degree on the dial.

[0061] The bent V-shaped plastic plate is left to cool down and then formed, and the formed V-shaped plastic plate is removed from the bending device, thereby completing the production of the V-shaped plastic plate.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A plastic bending process for explosion-proof switch processing, characterized in that: The following steps are involved: S100: Acquire a target angle of the V-shaped plastic plate, determine a first angle range according to the target angle, select a first preset angle according to the first angle range, and produce a V-shaped plastic plate of the first preset angle using a corresponding mold; S200: Clamping, the V-shaped plastic plate of the first preset angle is matched with the bending device corresponding to the first preset angle, and the V-shaped plastic plate enters the first pressing plate mechanism and the second pressing plate mechanism and is clamped; S300: Heating: heating the bending part of the V-shaped plastic plate by a heating device to soften it; S400: Bending: rotating the first pressing plate mechanism and the second pressing plate mechanism to drive the heated V-shaped plastic plate to perform a bending action, and bending the V-shaped plastic plate to a target angle; S500: Forming, the bent V-shaped plastic sheet is left to cool down and then formed; S600: Moving out, moving the formed V-shaped plastic plate out of the bending device.

2. The plastic bending process for explosion-proof switch processing according to claim 1 is characterized in that: There are multiple molds in step 100, each mold is in a V-shape with a first preset angle, the target angle of the V-shaped plastic plate is obtained, the first angle range is determined according to the target angle, and the first preset angle is selected according to the first angle range, and finally the corresponding mold is selected according to the first preset angle.

3. The plastic bending process for explosion-proof switch processing according to claim 2 is characterized in that: Each series of bending devices has a different first angle range allowed for bending, and the initial angle of the bending device is a first preset angle.

4. The plastic bending process for explosion-proof switch processing according to claim 3 is characterized in that: The first preset angle is slightly larger than a middle value of a first angle range allowed for bending by the corresponding bending device.

5. The plastic bending process for explosion-proof switch processing according to claim 1 is characterized in that: The target angle is any angle within the first angle range allowed for bending by each bending device.

6. The plastic bending process for explosion-proof switch processing according to claim 1 is characterized in that: The first pressing plate mechanism includes a first curved plate, and the second pressing plate mechanism includes a second curved plate; the first curved plate and the second curved plate in each bending device have different first angle ranges allowed for bending; in the initial state, the angle between the first curved plate and the second curved plate is a first preset angle.

7. The plastic bending process for explosion-proof switch processing according to claim 1 is characterized in that: In step S200, the second pressing plate mechanism is moved closer to the first pressing plate mechanism by the pushing mechanism.

8. The plastic bending process for explosion-proof switch processing according to claim 6, characterized in that: The heating mechanism in step S300 includes a first heating mechanism and a second heating mechanism, the first heating mechanism is used to heat the first curved plate, and the second heating mechanism is used to heat the second curved plate.

9. The plastic bending process for explosion-proof switch processing according to claim 1, characterized in that: The bending device is provided with a dial.

10. The plastic bending process for explosion-proof switch processing according to claim 6, characterized in that: The arc lengths of the first curved plate and the second curved plate are lengths corresponding to a first angle range allowed by the bending device when the first angle range is maximum.

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