Defrosting heater bending and correcting method

Abstract

The invention relates to the technical field of defrosting heater production and processing, and discloses a defrosting heater bending shape correction method, which comprises a shape correction device, the shape correction device comprises a case, a fixed clamping seat, a retreating cylinder, a movable clamping seat, an overturning cylinder and a control module, the fixed clamping seat is provided with a first clamping groove, and the movable clamping seat is provided with a second clamping groove; comprising the following steps that the initial state that a workpiece retreating air cylinder extends and the initial state that an overturning air cylinder contracts are kept, and the two ends of the defrosting heater to be shaped are placed in a first clamping groove and a second clamping groove; the control module sequentially controls the overturning air cylinder and the workpiece retreating air cylinder to act, and one-time deflection operation is completed. And the workpiece returning air cylinder and the overturning air cylinder are reset, the two ends of the second straight pipe part of the defrosting heater subjected to primary deflection are placed in the first clamping groove and the second clamping groove, the control module sequentially controls the overturning air cylinder and the workpiece returning air cylinder to act, and secondary deflection operation is completed. Manual operation is replaced, the shape correcting efficiency is improved, and meanwhile the machining consistency of products is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of defrost heater manufacturing and processing technology, and in particular to a method for bending and straightening a defrost heater. Background Technology

[0002] The defrost heater uses modified magnesium oxide as filler and stainless steel as shell. After shrinking the tube, the wiring terminals are sealed with special rubber compression and are bent according to the user's product requirements.

[0003] Among numerous products, the serpentine defrosting heater is the most widely used. It is formed by bending to create a triangular frame structure. The horizontal part of the frame structure has a first straight pipe section and a second straight pipe section arranged side by side. The outer ends of the two straight pipe sections are bent at 90° to form a terminal. In order to avoid the presence of heat accumulation areas in the heating areas of the two straight pipe sections during use, the above-mentioned bent defrosting heater needs to be calibrated. The common method is to use a special wrench and a limiting seat for processing. The limiting seat has a vertical slot, and the non-handled end of the wrench has a U-shaped groove. During operation, the bent part of the non-terminal end of the first straight pipe section is placed into the vertical slot. The wrench is used to hold the bent part of the non-terminal end of the second straight pipe section and bends it at a certain angle away from the first straight pipe section. Then, the bent part of the non-terminal end of the second straight pipe section is placed into the vertical slot, and the wrench is used to bend the bent part of its terminal end in the opposite direction until the terminal end of the second straight pipe section is parallel to the terminal end of the first straight pipe section. After calibration, there is a certain distance between the two straight pipe sections.

[0004] However, the above-mentioned traditional calibration method is manually operated, which is inefficient. Furthermore, the spacing of the straight pipe section after calibration has a large deviation due to human factors, and the parallelism of the two terminals also has a deviation, resulting in poor consistency of this type of defrosting heater product. Summary of the Invention

[0005] To address the shortcomings of the existing technology, this invention provides a method for bending and straightening a defrosting heater, which replaces manual operation, improves straightening efficiency, and ensures product processing consistency.

[0006] The technical solution of the present invention is as follows: a method for bending and straightening a defrosting heater, comprising a straightening device, the straightening device comprising a housing, a fixed mounting bracket fixed on one side of the housing, a retraction cylinder fixed on the other side of the housing, a movable mounting bracket moving in a direction approaching / away from the fixed mounting bracket under the drive of the retraction cylinder, a tilting cylinder driving the movable mounting bracket to rotate around its rotation axis, and a control module located inside the housing for controlling the actions of the tilting cylinder and the retraction cylinder. The fixed mounting bracket is provided with a first slot for inserting the bent portion of the defrosting heater, and the movable mounting bracket is provided with a second slot opposite to the first slot. Using the straightening device includes the following steps: maintaining the initial state of the retraction cylinder being extended and the initial state of the tilting cylinder being contracted, inserting the non-connection end bent portion of the first straight tube of the defrosting heater to be straightened into the first slot, and inserting the non-connection end bent portion of the second straight tube into the second slot; the control module sequentially controls the tilting cylinder. When the ejector cylinder operates, the moving chuck causes the non-connected end bend of the second straight tube to deflect by a set angle and then disengage from the second straight tube, completing one deflection operation. This causes the second straight tube and its non-connected and connected end bends to deflect relative to the first straight tube and its non-connected and connected end bends. The ejector cylinder and the tilting cylinder then reset, placing the connected end bend of the second straight tube of the defrost heater, after the first deflection, into the first slot, and the non-connected end bend of the second straight tube into the second slot. The control module then sequentially controls the tilting and ejector cylinders to operate, causing the moving chuck to deflect the non-connected end bend of the second straight tube by a set angle and then disengage from the second straight tube, completing a second deflection operation. This causes the non-connected end bend of the second straight tube to deflect by the same set angle relative to the connected end bend of the second straight tube, ultimately making the two connected ends of the defrost heater parallel, thus completing the bending and straightening of the defrost heater.

[0007] The tilting cylinder is an adjustable stroke cylinder. A tilting bracket is fixed on the housing. The cylinder body of the tilting cylinder is rotatably connected to the tilting bracket via a tilting shaft seat. A tilting frame is fixed on the side of the movable bracket away from the fixed bracket. A first rotating rod is fixed on the inner bottom side of the tilting frame, and a second rotating rod is fixed on the inner top side of the tilting frame. The first rotating rod is movably connected to the output shaft of the retraction cylinder via a first transmission component, forming the rotating shaft. The second rotating rod is movably connected to the output shaft of the tilting cylinder via a second transmission component. After the first rotating rod extends out of the tilting frame, it rotates in conjunction with the axial through hole of the connecting sleeve. Based on the initial state of the tilting cylinder's retraction setting, the dimensional parameters of the triangle formed by the center of the first rotating rod, the center of the second rotating rod, and the center of the tilting shaft seat are measured. The stroke of the tilting cylinder is obtained according to the defrosting heater calibration parameters and coordinate distance formula required by the user. Before maintaining the initial state of the tilting cylinder's retraction setting, the stroke of the tilting cylinder is adjusted according to the stroke.

[0008] In the initial state of the retracted retracted state of the reversing cylinder, the reversing frame is kept perpendicular to the surface of the chassis, and the reversing frame is perpendicular to the output shaft of the reversing cylinder.

[0009] The fixed card holder includes an upper card holder and a lower card holder. The lower card holder is fixed to the chassis, and the upper card holder is detachably connected to the lower card holder. An upper card slot on the upper card holder and a lower card slot on the lower card holder together constitute the first card slot. During the first deflection operation, the upper card holder and the lower card holder are separated, and the lower card slot serves as the first card slot. During the second deflection operation, the upper card holder and the lower card holder are connected, and the upper card slot serves as the first card slot.

[0010] The control module includes a time relay, an intermediate relay, a first solenoid valve, and a second solenoid valve. The air path of the first solenoid valve is connected to the air source interface of the tilting cylinder, and the air path of the second solenoid valve is connected to the air source interface of the ejection cylinder. The coils of the time relay, the intermediate relay, the first solenoid valve, and the second solenoid valve are connected in parallel in the main circuit. The normally open contact of the intermediate relay is connected in series with the coil of the first solenoid valve, and the normally open contact of the time relay is connected in series with the coil of the second solenoid valve.

[0011] The control module also includes a first magnetic switch and a second magnetic switch. The first magnetic switch is a normally open magnetic switch, fixed on the cylinder body of the tilting cylinder. The normally open contact of the first magnetic switch is connected in series with the coil of the time relay. When the tilting cylinder is extended, the piston magnetic ring of the tilting cylinder engages with the first magnetic switch to sense the movement. The second magnetic switch is a normally closed magnetic switch, fixed on the cylinder body of the ejection cylinder. The normally closed contact of the second magnetic switch is connected in series with the main circuit. When the ejection cylinder is retracted, the piston magnetic ring of the ejection cylinder engages with the second magnetic switch to sense the movement.

[0012] In summary, the present invention has the following main beneficial effects: This invention employs a calibration device equipped with a tilting cylinder, a retraction cylinder, a moving clamp, and a fixed clamp. The non-connection bent portions of the two straight tube sections of the defrost heater are placed into the first clamping slot of the fixed clamp and the second clamping slot of the moving clamp, respectively. The tilting cylinder causes the moving clamp to deflect at a certain angle, creating a predetermined interval between the two straight tube sections of the defrost heater. The retraction cylinder then moves the moving clamp away from the fixed clamp, disengaging the defrost heater from the moving clamp. After the two cylinders reset, the two bent portions of the deflected straight tube sections are placed back into the first and second clamping slots, respectively. This process is repeated until the non-connection bent portions of the straight tube sections deflect by the same angle relative to the connection bent portions. At this point, the connection end of the straight tube section reaches a position parallel to the connection end of the other straight tube section, completing the bending calibration of the defrost heater. The entire process is operated by two cylinders, resulting in higher calibration efficiency compared to manual operation. Furthermore, in mass production, the constant rotation angle of the tilting cylinder ensures high consistency within the same batch of products. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the present invention in its initial state; Figure 2 This is a schematic diagram of the structure after the tilting cylinder has been activated in this invention; Figure 3 This is a schematic diagram of the structure after the ejection cylinder in this invention has been activated; Figure 4 This is a schematic diagram of the structure after the present invention has been reset; Figure 5 This is a cross-sectional schematic diagram of the operation of the present invention; Figure 6 This is a coordinate trajectory diagram formed by the center of the first rotating rod, the center of the second rotating rod, and the center of the flipping shaft seat according to the rotation of the flipping frame in this invention; Figure 7 This is a schematic diagram of the structure of the movable card holder and the flipping frame in this invention; Figure 8 This is a structural diagram of the upper card slot in this utility model. Figure 9 yes Figure 1 Larger image of part A in the middle; Figure 10 yes Figure 1 A magnified view of part B in the image; Figure 11 This is a circuit connection diagram of the control module in this invention; Figure 12 This is a structural diagram of the defrosting heater calibration process in this invention, wherein, Figure 12 (a) is a structural diagram of the defrost heater in its initial state. Figure 12 (b) is a structural diagram of the first straight pipe section of the defrost heater after it has been deflected relative to the second straight pipe section. Figure 12 (c) is a structural diagram of the non-connection end bend of the first straight tube section of the defrost heater after it is deflected relative to the connection end bend. Figure 13 This is a side view of the defrosting heater after calibration in this invention.

[0014] Reference numerals: 100, Defrosting heater; 101, First straight pipe section; 102, Second straight pipe section; 103, Terminal; 104, First bend; 105, Second bend; 106, Third bend; 1, Chassis; 2, Fixed bracket; 201, Lower bracket; 202, Upper bracket; 203, Snap-fit ​​post; 204, First slot; 205, Snap-fit ​​hole; 3, Moving bracket; 301, Flip frame; 302, First rotating rod; 3021, First annular groove; 3022, Second annular groove; 303, Second... 304. Rotating rod; 305. Second slot; 306. Resin pad; 4. Part ejection cylinder; 401. Cylinder mounting seat; 402. Second magnetic switch; 403. Second solenoid valve; 5. Tilting cylinder; 501. Tilting shaft seat; 502. First magnetic switch; 503. First solenoid valve; 504. Adjusting screw; 505. Adjusting nut; 6. Tilting bracket; 7. Connecting sleeve; 701. First snap ring; 702. Second snap ring; 8. Rotating sleeve; 9. Guide seat; 901. Guide groove; 10. Sliding seat; 11. Pipe clamp. Detailed Implementation

[0015] The technical solutions of the present invention will now be described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0016] Hereinafter, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0017] Furthermore, in this invention, directional terms such as "upper," "lower," "left," and "right" may be defined relative to the orientation of the components shown in the accompanying drawings. It should be understood that these directional terms can be relative concepts, used for relative description and clarification, and can change accordingly depending on the orientation of the components in the accompanying drawings.

[0018] This invention provides a method for bending and straightening a defrost heater, which uses a straightening device to straighten the defrost heater, wherein, as shown in the figure... Figures 1-4As shown, the calibration device includes a chassis 1, a fixed mounting base 2, a movable mounting base 3, a flipping bracket 6, a flipping cylinder 5, and a part ejection cylinder 4. The fixed mounting base 2 and the part ejection cylinder 4 are fixed to the chassis 1 facing each other, as detailed below. Figure 2 As shown, the card holder is fixed on the left side of the chassis 1, and the cylinder body of the ejector cylinder 4 is fixed on the right side of the chassis 1 via the cylinder mounting seat 401. Its output shaft is set towards the fixed card holder 2. The movable card holder 3 is movably connected to the output shaft of the ejector cylinder 4 via the first transmission component. Under the drive of the ejector cylinder 4, it moves closer to / away from the fixed card holder 2 along the axis of the output shaft of the ejector cylinder 4. Furthermore, the first transmission component has a rotating shaft for the movable card holder 3 to rotate circumferentially. The flipping bracket 6 is fixed on the chassis 1 outside the movable card holder 3. The flipping cylinder 5 is rotatably mounted on the flipping bracket 6 in a direction parallel to the axis of the output shaft of the ejector cylinder 4. Specifically, as shown... Figure 1 As shown, a tilting cylinder 5 has a tilting shaft seat 501 fixed at the front end of its cylinder body. The tilting shaft seat 501 has rotating shafts formed at both ends that rotatably cooperate with the tilting bracket 6. The moving bracket 3 is movably connected to the output shaft of the tilting cylinder 5 via a second transmission component and rotates around the rotating shaft under the drive of the tilting cylinder 5. The fixed bracket 2 has a first slot 204, and the moving bracket 3 has a second slot 304 opposite to the first slot 204. The first slot 204 is used to insert the first bend 104 or the third bend 106 of the defrost heater 100, and the second slot is used to insert the second bend 105 of the defrost heater 100. A control module for controlling the operation of the tilting cylinder 4 and the ejection cylinder 4 is installed inside the housing 1.

[0019] The following describes the school's methodology, such as... Figure 1 and Figure 12 As shown in (a), the tilting cylinder 5 is initially in a retracted position, and the retraction cylinder 4 is initially in an extended position. In this initial state, the first bent portion 104 of the first straight tube 101 of the defrosting heater 100 is placed into the first slot 204, and the second bent portion 105 of the second straight tube 101 is placed into the second slot 304. The control module drives the tilting cylinder 5 to extend, which causes the mounting bracket 3 to deflect by a set angle, such as... Figure 2 As shown, the second straight tube section 102, its second bent section 105, and its third bent section 106 of the defrost heater 100 are arranged together with the first straight tube section 101 at a distance corresponding to the deflection angle, such as... Figure 3 As shown, the control module drives the retraction cylinder 4 to retract, which causes the moving bracket 3 to move away from the fixed bracket 2, so that the second bent part 105 of the defrost heater 100 disengages from the moving bracket 3, completing one deflection operation; after the dual cylinders reset, as... Figure 4 As shown, after one deflection operation, the two bent portions of the second straight tube section 102 of the defrost heater are respectively placed into the first slot 204 and the second slot 304, i.e. Figure 12 As shown in (b), the third bend 106 of the second straight tube 102 is placed into the first slot 204, and the second bend 105 of the second straight tube 102 is placed into the second slot 304. The control module repeats the driving actions of the flipping cylinder 5 and the ejection cylinder 4, causing the second bend 105 of the second straight tube 102 to deflect by the same angle relative to the third bend 106, completing the secondary deflection operation. At this time, the wiring terminal 103 of the second straight tube 102 reaches a position parallel to the wiring terminal 103 of the first straight tube 101, as shown in (b). Figure 12 As shown in (c), the bending and shaping of the defrosting heater 100 is completed. The entire process is carried out by the coordinated operation of two cylinders, which replaces the traditional manual shaping, greatly improving the shaping efficiency. In mass production, since the rotation angle of the flipping cylinder 5 is kept consistent, the products in the same batch have a high degree of consistency after shaping.

[0020] Specifically, in this solution, the control module includes a time relay, an intermediate relay, a first solenoid valve 503, a second solenoid valve 403, a first magnetic switch 502, and a second magnetic switch 402. The first magnetic switch 502 is a normally open magnetic switch. Figure 2 As shown, the first magnetic switch 502 is fixed on the cylinder body of the tilting cylinder 5. When the tilting cylinder 5 is extended, the piston magnetic ring of the tilting cylinder 5 engages with the first magnetic switch 502 to sense the movement. The second magnetic switch 402 is a normally closed magnetic switch, such as... Figure 2 As shown, the second magnetic switch 402 is fixed on the cylinder body of the ejection cylinder 4. When the ejection cylinder 4 is in the retracted state, the piston magnetic ring of the ejection cylinder 4 engages with the second magnetic switch 402 to sense the movement. Figure 3 As shown, the air path of the first solenoid valve 503 is connected to the air source interface of the tilting cylinder 5, and the air path of the second solenoid valve 403 is connected to the air source interface of the ejection cylinder 4. In this scheme, both the tilting cylinder 5 and the ejection cylinder 4 are double-acting cylinders. Therefore, the first solenoid valve 503 used to drive the tilting cylinder 5 and the second solenoid valve 403 used to drive the ejection cylinder 4 are two-position five-way solenoid valves. Figure 11As shown, the coil SJ1 of the time relay, the coil J1 of the intermediate relay, the coil VA of the first solenoid valve 503, and the coil VB of the second solenoid valve 403 are connected in parallel in the main power supply circuit. The normally open contact J1-1 of the intermediate relay is connected in series with the coil VA of the first solenoid valve 503, the normally open contact SJ1-1 of the time relay is connected in series with the coil VB of the second solenoid valve 403, the normally open contact SQ1 of the first magnetic switch 502 is connected in series with the coil SJ1 of the time relay, and the normally closed contact SQ2 of the second magnetic switch 402 is connected in series with the main power supply circuit. More preferably, a foot switch JT is used to switch the main power supply circuit on and off. Another normally open contact J1-2 of the intermediate relay is connected in series with the foot switch JT. When the foot switch JT is pressed, the coil J1 of the intermediate relay is energized, and the two normally open contacts J1-2... When J1-1 and J1-2 are closed, the branch containing the coil VA of the first solenoid valve 503 is energized. The tilting cylinder 5 extends until the piston magnetic ring senses the first magnetic switch 502. The normally open contact SQ1 of the first magnetic switch 502 closes, and the branch containing the coil SJ1 of the time relay is energized. After a delay of 2-3 seconds (effectively deflecting the first straight tube 101), the normally open contact SJ1-1 of the time relay closes, and the branch containing the coil VB of the second solenoid valve 403 is energized. The retraction cylinder 4 retracts until the piston magnetic ring senses the second magnetic switch 402. The normally closed contact SQ2 of the second magnetic switch 402 opens, the main circuit is de-energized, and the coils VA and VB of the first and second solenoid valves 503 are de-energized. This causes the tilting cylinder 5 to retract and reset, and the retraction cylinder 4 to extend and reset, completing one deflection operation of the bending and straightening.

[0021] like Figure 7 As shown, a flip frame 301 is fixed on the side of the movable card holder 3 away from the fixed card holder 2, and a first rotating rod 302 is fixed on the inner bottom side of the flip frame 301. Figure 10 As shown, the first transmission component is a connecting sleeve 7 fixed to the end of the output shaft of the ejector cylinder 4. The first rotating rod 302 extends out of the flipping frame 301 and rotates in conjunction with the axial through hole of the connecting sleeve 7. This first rotating rod 302 forms the rotation axis of the movable retainer 3. To enable the movable retainer 3 to move back and forth with the ejector cylinder 4, the connecting sleeve 7 is provided with a limiting component to restrict the axial displacement between the first rotating rod 302 and the connecting sleeve 7. A second rotating rod 303 is fixed to the inner top of the flipping frame 301, as shown... Figure 2As shown, the second transmission component is a rotating sleeve 8 fixed to the end of the output shaft of the tilting cylinder 5. The rotating sleeve 8 is rotatably connected to the second rotating rod 303. Preferably, the distance that the rotating sleeve 8 is allowed to move on the second rotating rod 303 is not less than the stroke of the output shaft of the ejection cylinder 4. That is, in the initial state (extended state) of the ejection cylinder 4, the distance between the end face of the rotating sleeve 8 facing the moving card seat 3 and the inner wall of the tilting frame 301 opposite it is the distance that the rotating sleeve 8 is allowed to move on the second rotating rod 303.

[0022] Further preferred, such as Figure 5 As shown, the tilting cylinder 5 is an adjustable cylinder. Specifically, an adjusting nut 505 is threaded onto the adjusting screw 504 of the adjustable cylinder. The adjusting nut 505 is used to adjust the stroke of the output shaft of the adjustable cylinder so that the stroke corresponds to the distance to be calibrated between the two straight pipe sections of the defrosting heater 100; specifically, as shown... Figure 13 As described above, in the initial state of the retracted cylinder 5, the dimensional parameters of the triangle formed by the center of the first rotating rod 302, the center of the second rotating rod 303, and the center of the retracting shaft 501 in this initial state are measured. Based on the user's requirement for the distance D between the first straight tube section 101 and the second straight tube section 102 of the defrost heater 100, and combined with the dimensions of the defrost heating tube, the deflection angle α is calculated. Figure 5 As shown, in the initial state of the retracted position of the tilting cylinder 5, the tilting frame 301 is set perpendicular to the surface of the housing 1, and the output shaft of the tilting cylinder 5 is set perpendicular to the tilting frame 301. At this time, the triangle formed by the center of the first rotating rod 302, the center of the second rotating rod 303, and the center of the tilting shaft seat 501 is a right triangle. Therefore, the dimensional parameter of the above triangle is the vertical height H between the center of the rotating shaft part of the tilting shaft seat 501 and the center of the first rotating rod 302, which is also equal to the distance between the center of the first rotating rod 302 and the center of the second rotating rod 303. The distance L1 between the center of the rotating shaft part of the tilting shaft seat 501 and the center of the second rotating rod 303 in this state is measured. The distance L2 between the center of the rotating shaft part of the tilting shaft seat 501 and the center of the second rotating rod 303 is calculated based on the above parameters. The calculation method is as follows: Figure 6 As shown, with the center of the first rotating rod 302 as the origin, the center coordinates of the rotating shaft of the flipping bearing 501 are (L1, H). After the flipping cylinder 5 extends and drives the moving chuck 3 to rotate by an angle 'a', the center coordinates of the second rotating rod 303 are (-Hsina, Hcosa). According to the following coordinate distance formula: The value of L2 is calculated. The difference between L2 and L1 is the output shaft stroke of the adjustable cylinder adjusted by adjusting nut 505. Before the initial state of the retracting cylinder setting, the stroke of the retracting cylinder is adjusted according to the above-calculated stroke to adapt to the user's requirements for the straight pipe spacing of the defrosting heater 100.

[0023] It is worth noting that, such as Figure 7 and Figure 10 As shown, the limiting component includes a first retaining ring 701 and a second retaining ring 702. The first rotating rods 302 on both sides of the connecting sleeve 7 are respectively provided with a first annular groove 3021 and a second annular groove 3022. The first retaining ring 701 cooperates with the first annular groove 3021, and the second retaining ring 702 cooperates with the second annular groove 3022. By limiting the front side of the first retaining ring 701, it is ensured that the moving retaining seat 3 moves together with the output shaft of the ejection cylinder 4 in the direction close to the fixed retaining seat 2. By limiting the rear side of the second retaining ring 702, it is ensured that the moving retaining seat 3 moves together with the output shaft of the ejection cylinder 4 in the direction away from the fixed retaining seat 2.

[0024] like Figure 4 As shown, since the height of the third bend 106 is higher than the height of the first bend 104 when the same defrost heater 100 is deflected twice, in order to effectively place and block the two bends in both deflection operations, and to quickly remove the bends after the deflection operation, it is further preferred that the fixed bracket 2 includes an upper bracket 202 and a lower bracket 201. The lower bracket 201 is fixed to the housing 1, and the upper bracket 202 is detachably connected to the lower bracket 201. In this solution, the upper bracket 202 and the lower bracket 201 are detachably connected by a locking post 203 and a locking hole 205. Figure 3 As shown, the surface of the lower retainer 201 is formed with retaining posts 203, such as... Figure 8 As shown, the upper card holder 202 has a card-attaching hole 205 at its bottom. In other embodiments, a card-attaching hole 205 can also be formed on the lower card holder 201, and a card-attaching post 203 can be formed at the bottom of the upper card holder 202. The upper card slot on the upper card holder 202 and the lower card slot on the lower card holder 201 both constitute the first card slot 204, as shown. Figures 1-3 As shown, during a deflection operation, the upper card holder 202 and the lower card holder 201 are separated, and the lower card slot serves as the first card slot 204, as... Figure 4 As shown, during the secondary deflection operation, the upper card holder 202 is inserted into the lower card holder 201, and the upper card slot serves as the first card slot. Preferably, in order to avoid the defrosting heater 100 being scratched, a U-shaped resin pad 305 can be fixedly installed in the movable card holder 3, the upper card holder 202 and the lower card holder 201.

[0025] Further preferred, such as Figure 10 As shown, a sliding seat 10 is fixed on the frame. The sliding seat 10 is located between the moving bracket 3 and the ejector cylinder 4. The sliding seat 10 is provided with a sliding hole for the first rotating rod 302 to pass through. The sliding seat 10 and the first rotating rod 302 slide together to improve the stability of the first rotating rod 302 moving axially with the output shaft of the ejector cylinder 4. Preferably, the end face of the sliding seat 10 is parallel to the end face of the rotating sleeve 8 so that the distance that the sliding seat 10 can move on the first rotating rod 302 is the same as the distance that the rotating sleeve 8 can move on the second rotating rod.

[0026] like Figure 1 and Figure 9 As shown, a guide seat 9 is fixed on the frame. The guide seat 9 is located between the fixed clamping seat 2 and the movable clamping seat 3, and the guide seat 9 is provided with a guide groove 901 for inserting the tube of the defrost heater 100. More preferably, the guide groove 901 is a semi-cylindrical groove, and a pipe clamp 11 is fixed to one end of the guide seat 9. The center of the inner ring surface of the pipe clamp 11 coincides with the axis of the guide groove 901, which temporarily fixes the defrost heater 100 placed on the device, preventing the defrost heater 100 from detaching from the platform of the machine box 1 when the retraction cylinder 4 is in the retraction action. Moreover, the temporary fixation by the pipe clamp 11 facilitates the removal of the defrost heater 100 after the first and second deflection operations.

[0027] The bending and straightening method using the above-mentioned straightening device completes a deflection operation through the cooperation of the flipping cylinder 5 and the retraction cylinder 4, so that the second straight tube section 102 is deflected relative to the first straight tube section 101 to the required straightening spacing size. A second deflection operation is completed through the cooperation of the flipping cylinder 5 and the retraction cylinder 4, so that the two terminals 103 of the defrost heater 100 after straightening are in a parallel position. The entire straightening process is simple to operate, has high straightening efficiency, and the defrost heaters 100 in the same batch have high straightening consistency.

[0028] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for bending and straightening a defrosting heater, characterized in that, The device includes a calibration apparatus, comprising a chassis, a fixed mounting bracket fixed to one side of the chassis, a retraction cylinder fixed to the other side of the chassis, a movable mounting bracket that moves towards / away from the fixed mounting bracket under the drive of the retraction cylinder, a tilting cylinder that drives the movable mounting bracket to rotate around its rotation axis, and a control module located inside the chassis for controlling the actions of the tilting cylinder and the retraction cylinder. The fixed mounting bracket has a first slot for inserting the bent part of the defrosting heater, and the movable mounting bracket has a second slot opposite to the first slot. Using the calibration apparatus includes the following steps: maintaining the retraction cylinder in its initial extended state and the tilting cylinder in its initial retracted state. In the first position, the non-connection end bend of the first straight tube section of the defrosting heater to be calibrated is placed into the first slot, and the non-connection end bend of the second straight tube section is placed into the second slot. The control module sequentially controls the tilting cylinder and the ejection cylinder to operate. The moving bracket drives the non-connection end bend of the second straight tube section to deflect by a set angle and then disengage from the second straight tube section, completing one deflection operation. The ejection cylinder and the tilting cylinder are reset, and the connected end bend of the second straight tube section of the defrosting heater after one deflection is placed into the first slot, and the non-connection end bend of the second straight tube section is placed into the second slot. The control module sequentially controls the tilting cylinder and the ejection cylinder to operate, completing a second deflection operation.

2. The method for bending and straightening a defrosting heater according to claim 1, characterized in that, The tilting cylinder is an adjustable stroke cylinder. A tilting bracket is fixed on the housing. The cylinder body of the tilting cylinder is rotatably connected to the tilting bracket via a tilting shaft seat. A tilting frame is fixed on the side of the moving bracket away from the fixed bracket. A first rotating rod is fixed on the inner bottom side of the tilting frame, and a second rotating rod is fixed on the inner top side of the tilting frame. The first rotating rod is movably connected to the output shaft of the retraction cylinder via a first transmission component, forming the rotating shaft. The second rotating rod is movably connected to the output shaft of the tilting cylinder via a second transmission component. After the first rotating rod extends out of the tilting frame, it rotates in conjunction with the axial through hole of the connecting sleeve. Based on the initial state of the tilting cylinder's retraction setting, the dimensional parameters of the triangle formed by the center of the first rotating rod, the center of the second rotating rod, and the center of the tilting shaft seat are measured. The stroke of the tilting cylinder is obtained according to the defrosting heater calibration parameters and coordinate distance formula required by the user. Before maintaining the initial state of the tilting cylinder's retraction setting, the stroke of the tilting cylinder is adjusted according to the stroke.

3. The method for bending and straightening a defrosting heater according to claim 2, characterized in that, In the initial state of the retracted retracted state of the reversing cylinder, the reversing frame is kept perpendicular to the surface of the chassis, and the reversing frame is perpendicular to the output shaft of the reversing cylinder.

4. A method for bending and straightening a defrosting heater according to any one of claims 1-3, characterized in that, The fixed card holder includes an upper card holder and a lower card holder. The lower card holder is fixed to the chassis, and the upper card holder is detachably connected to the lower card holder. An upper card slot on the upper card holder and a lower card slot on the lower card holder together constitute the first card slot. During the first deflection operation, the upper card holder and the lower card holder are separated, and the lower card slot serves as the first card slot. During the second deflection operation, the upper card holder and the lower card holder are connected, and the upper card slot serves as the first card slot.

5. A method for bending and straightening a defrosting heater according to any one of claims 1-3, characterized in that, The control module includes a time relay, an intermediate relay, a first solenoid valve, and a second solenoid valve. The air path of the first solenoid valve is connected to the air source interface of the tilting cylinder, and the air path of the second solenoid valve is connected to the air source interface of the ejection cylinder. The coils of the time relay, the intermediate relay, the first solenoid valve, and the second solenoid valve are connected in parallel in the main circuit. The normally open contact of the intermediate relay is connected in series with the coil of the first solenoid valve, and the normally open contact of the time relay is connected in series with the coil of the second solenoid valve.

6. The method for bending and straightening a defrosting heater according to claim 5, characterized in that, The control module also includes a first magnetic switch and a second magnetic switch. The first magnetic switch is a normally open magnetic switch, fixed on the cylinder body of the tilting cylinder. The normally open contact of the first magnetic switch is connected in series with the coil of the time relay. When the tilting cylinder is extended, the piston magnetic ring of the tilting cylinder engages with the first magnetic switch to sense the movement. The second magnetic switch is a normally closed magnetic switch, fixed on the cylinder body of the ejection cylinder. The normally closed contact of the second magnetic switch is connected in series with the main circuit. When the ejection cylinder is retracted, the piston magnetic ring of the ejection cylinder engages with the second magnetic switch to sense the movement.

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