Plastic spraying assembly line for springs for shock absorbers and control method of plastic spraying assembly line

Abstract

The invention discloses plastic spraying processing equipment for springs, and aims to provide a plastic spraying assembly line for springs for shock absorbers and a control method of the plastic spraying assembly line, which are high in processing continuity, high in automation degree and capable of ensuring the plastic spraying uniformity on the surfaces of the springs of the shock absorbers. According to the technical scheme, the three-dimensional dynamic spraying track of the shock absorber spring is achieved through cooperative driving of a sliding frame and a suspension structure in a material conveying device, the plastic spraying position can effectively cover a spiral structure in the spring and dead corners at the end, sensors are arranged in multiple areas, and the spraying speed is increased. The power of the feedback regulation is regulated through real-time temperature difference regulation, so that the temperature gradient between each position in the plastic spraying box body and between the plastic spraying box body and the outside is less than or equal to 20 DEG C, the problem of powder pre-curing or poor leveling property caused by local temperature deviation in the plastic spraying process is avoided, the uniformity of plastic spraying is improved, and the service life of the plastic spraying box body is prolonged. The spring plastic spraying device is suitable for the technical field of spring plastic spraying machining equipment.

Description

Technical Field

[0001] The present invention relates to a plastic spraying processing device for a spring, and more specifically, to a plastic spraying production line for a spring used in a shock absorber and a control method thereof. Background Art

[0002] The shock absorber spring is a kind of vulnerable accessory, and its effect directly affects the stability and safety of the equipment. In order to ensure that the shock absorber is in good working condition, the surface of the shock absorber spring needs to be sprayed with plastic to ensure that the shock absorber spring steel will not rust and increase the service life of the shock absorber spring. Spraying is to charge the plastic powder through high-voltage electrostatic equipment, and spray the paint onto the surface of the workpiece under the action of the electric field. The powder will be evenly adsorbed on the surface of the workpiece to form a powdery coating; and the powdery coating will be leveled and solidified after high-temperature baking, and the plastic particles will melt into a dense final protective coating with different effects.

[0003] At present, when spraying the shock absorber spring, the spring needs to be pre-treated, sprayed, dried and tested separately, the processing efficiency is low, and the spring needs to be moved between the various stations manually or by a robotic arm. The linkage between the stations is low, and the spraying of the shock absorber spring needs to be done manually, which will result in uneven spraying, high processing costs and complicated processes. Summary of the invention

[0004] In view of the deficiencies in the prior art, the object of the present invention is to provide a spraying line for shock absorber springs and a control method thereof which have high processing consistency, high degree of automation and can ensure uniform spraying on the surface of the shock absorber springs.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a spray-molded production line for springs for shock absorbers, comprising a spray-molded box, with spring inlets and spring outlets on both sides of the spray-molded box, a material transport device is provided on the top of the spray-molded box, the material transport device comprises a sliding frame, a spring suspension structure arranged on the sliding frame, and a driving structure arranged between the sliding frame and the spring suspension structure, the driving structure is used to control the spring suspension structure to move along the length direction of the sliding frame while rotating around the central axis of the spring suspension structure, a heating device is also provided in the spray-molded box, the heating device comprises a plurality of heating lamp bodies arranged on the top of the spray-molded box, the heating lamp bodies are symmetrically arranged along the length direction of the sliding frame, a spray-molded device is also provided on the side wall of the spray-molded box, and temperature sensors are provided at the spring inlet, the spring outlet and the spray-molded box.

[0006] The present invention is further configured as follows: the plastic spraying device includes a processing spray gun arranged on the side wall of the plastic spraying box, a material storage box arranged on the processing spray gun, and an adjustment mechanism and a detection mechanism arranged between the processing spray gun and the plastic spraying box, wherein the adjustment mechanism is used to adjust the relative position of the processing spray gun in the plastic spraying box.

[0007] The present application also provides a control method for a spray-molding assembly line for a spring for a shock absorber, the control method comprising the following steps: S1, pretreatment of the spring: before spray-molding, the surface of the spring to be processed is shot blasted and cleaned to improve the uniformity of the spring surface;

[0008] S2, spring loading: loading the pre-processed spring into the spring suspension structure and setting the pitch of the current spring;

[0009] S3, Plastic spray box adaptation: The plastic spray box adjusts the position of the plastic spray device on the plastic spray box based on the pitch of the spring that needs to be processed;

[0010] S4, box preheating: start the heating device in the spray box, and continue to heat the inside of the spray box. The heating time is T. After the T time period, respectively detect the temperature of the spring inlet, spring outlet and the inside of the spray box as Wj, Wc and Wn, and detect the external temperature as W0. Compare the detected temperatures. If Wj-W0≥20℃, it is judged that the temperature difference between the current external environment and the spring inlet is too large, and the temperature at the spring inlet is too high. Reduce the heating power of the heating lamp body near the spring inlet in the spray box so that the temperature difference between Wj and W0 is less than 20℃, if Wc-W0≥20℃, it is judged that the temperature difference between the current external environment and the spring outlet is too large, and the temperature at the spring outlet is too high. The heating power of the heating lamp body near the spring outlet in the spray box is reduced to make the temperature difference between Wc and W0 less than 20℃. If the temperature difference between Wn and Wj or Wc is ≥20℃, it is judged that the temperature difference in the current spray box is too large. The spray box adjusts the heating power of each heating lamp body based on the external temperature W0 to make the temperature in the spray box uniform and the temperature difference with the external temperature is small, and jumps to S5 for spring position detection;

[0011] S5, spring detection: start the assembly line, the material transport device drives the spring inside it to move, and the detection mechanism in the spray-molding device detects the inside of the spray-molding box. If the detection mechanism does not detect the presence of a spring in the spray-molding box, it is determined that the current spring has not moved into the spray-molding box, and the material transport device continues to move while continuing to detect the inside of the spray-molding box. On the contrary, if the detection mechanism detects the presence of a spring in the spray-molding box, it is determined that the current spring has moved into the spray-molding box, and jump to step S6 to spray the spring;

[0012] S6. Spring spraying: The driving structure controls the rotation of the spring, and the spraying device controls the spraying of the spring. During the spraying of the spring, the spraying device reciprocates along the height direction of the spraying box, and the movement speed matches the rotation speed of the control spring. During the movement of the spraying device, the detection mechanism detects the spring. If the detection mechanism detects the spring, the spraying device maintains the current movement direction and continues to move. Otherwise, if the detection mechanism does not detect the spring, it is determined that the spraying device has moved to the top / bottom end of the current spring, and the spraying device changes the movement direction and continues to move.

[0013] Preferably, the spring pretreatment in step S1 comprises the following steps: S11, pre-cleaning the oil stains and impurities on the surface of the spring to ensure that the shot blasting medium can effectively contact the surface;

[0014] S12, the spring surface is shot blasted with cast steel shot for a time of T1, and after the T1 period, ceramic shot blasting is used for fine finishing for a time of T2;

[0015] S13, after shot blasting, remove the residual projectiles and jump to S14 for surface cleaning;

[0016] S14. Use alkaline solution to clean the surface of the spring and remove grease through saponification and emulsification.

[0017] S15. After cleaning is completed, dissolve the non-saponifiable oil by soaking in gasoline.

[0018] Preferably, the control method further includes a spraying effect detection of the spring, comprising the following steps: S7, after the spraying process of the spring is completed, the finished springs are arranged and suspended on the sliding rack, and a number of finished springs are randomly selected, and the selected quantity is: 2 at the head end of the sliding rack, 2 in the middle part, and 2 at the end;

[0019] S8, inspect the surface of the spring. If there is no surface defect on the spring, the current spring is judged to be qualified, and the process jumps to S9 for adhesion test. Otherwise, the spring is judged to be unqualified and the current spring is placed in the unqualified area.

[0020] S9, sticking tape on the surface of the spring, the tape is attached for T3 time period, after T3 time period, tear off the tape, if the peeling area on the surface of the spring is ≥5%, it is judged that the spray adhesion is poor, the device is unqualified, and the current spring is placed in the unqualified area, otherwise, it is judged that the current spring is qualified, jump to S10 for environmental resistance test;

[0021] S10, immerse the spring in sodium chloride solution for 18 hours, and check whether bubbles, rust or plastic coating peeling appear on the surface of the spring. If not, the current spring is judged to be qualified, otherwise, it is placed in the unqualified area. The qualified spring is cycled from -40°C to 110°C for 5 times to detect the cracking effect of the coating. If the coating state is normal, the spring is judged to be qualified, otherwise it is placed in the unqualified area;

[0022] S11. Count the unqualified springs and record the number of unqualified springs as X. If X=2 at the head end of the sliding frame, the springs at the head end of the sliding frame are judged to be unqualified, and 1 / 3 of the springs at the head end are removed for rework. Otherwise, the springs at the head end of the sliding frame are judged to be qualified. If X=2 at the middle part of the sliding frame, the springs in the middle part of the sliding frame are judged to be unqualified, and 1 / 3 of the springs in the middle are removed for rework. Otherwise, the springs in the middle part of the sliding frame are judged to be qualified. If X=2 at the end of the sliding frame, the springs at the end of the sliding frame are judged to be unqualified, and 1 / 3 of the springs at the end are removed for rework. Otherwise, the springs at the end of the sliding frame are judged to be qualified.

[0023] By adopting the above technical scheme, the beneficial effects are as follows: 1. The present application uses the coordinated driving of the sliding frame and the suspension structure in the material transport device to enable the spring to move along the length direction of the material transport device and to rotate synchronously during the movement, and combined with the reciprocating motion of the spray-molding device in the height direction of the spray-molding box, a three-dimensional dynamic spraying trajectory for the shock absorber spring is realized, so that the spray-molding position can effectively cover the spiral structure in the spring and the dead angle at the end. At the same time, the heating device is arranged on the top of the spray-molding box, and a symmetrically distributed heating lamp body is used to quickly heat up the inside of the spray-molding box, and the processing efficiency is high. In addition, the inside of the spray-molding box is heated by the spring. Multi-zone sensors are installed at the inlet, spring outlet and inside the spray box. The power is adjusted by real-time temperature difference adjustment feedback to ensure that the temperature gradient at each position in the spray box and between the spray box and the outside world is ≤20°C, avoiding the problem of pre-solidification of powder or poor leveling due to local temperature deviation during the spray process, improving the uniformity of the spray and the effect of the finished product. Furthermore, a staged shot blasting method is adopted in the pre-treatment of the spring, and it is cleaned by immersion in alkaline solution and gasoline, which reduces the surface roughness of the shock absorber spring and improves the adhesion of the spray. The above method greatly improves the processing continuity and automation performance, and the effect of use is good.

[0024] 2. Further, in this application, a temperature sensor is used to detect the temperatures at various positions inside the powder spraying box and the temperature difference between the inside of the powder spraying box and the outside. When the temperature difference between the spring inlet or outlet and the outside / inside of the powder spraying box is ≥ 20°C, the power of the heating lamp body in the corresponding area can be automatically reduced, making the outside temperature - spring inlet / outlet temperature - inside temperature of the powder spraying box tend to be balanced. For example, when the outside temperature is 25°C, the temperature inside the box can be stably and evenly maintained at about 45°C, avoiding uneven crosslinking degree of the coating caused by environmental temperature fluctuations and reducing the curing defect rate.

[0025] 3. At the same time, the powder spraying device can automatically adjust its position based on the pitch of the spring, and can provide real-time feedback on the spring position through a detection mechanism, achieving the matching of the spray gun moving speed, spring moving speed, and spring rotation speed. This enables accurate coverage of the spring spiral gap during the powder spraying process, avoiding problems such as coating accumulation or omission caused by changes in the pitch of different shock absorber springs and improving the qualified rate of the finished product.

[0026] 4. Moreover, after the shock absorber spring is processed, it is subjected to staged sampling and testing at different positions of the shock absorber spring. Specifically, during processing, the powder residue in the powder spraying device will to a certain extent affect the powder spraying effect on the shock absorber spring. By extracting spring finished products at the head, middle, and tail ends of the sliding rack respectively, the detection range covers various powder residue stages, improving the accuracy of detection. Thus, the distribution area of unqualified products can be quickly located, targeted rework can be carried out, reducing material loss. At the same time, an extreme environment is simulated during testing to ensure that the finished product has high anti-cracking performance, meeting the usage requirements of the finished shock absorber spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a specific structural schematic diagram of an embodiment of a powder spraying production line and its control method for a spring used in a shock absorber of the present invention;

[0028] Figure 2 It is a specific structural schematic diagram of an embodiment of a powder spraying production line and its control method for a spring used in a shock absorber of the present invention from another direction

[0029] Figure 3 It is a control method flow chart of an embodiment of a powder spraying production line and its control method for a spring used in a shock absorber of the present invention;

[0030] Figure 4 It is a spring pretreatment method flow chart of an embodiment of a powder spraying production line and its control method for a spring used in a shock absorber of the present invention;

[0031] Figure 5 It is a finished product detection flow chart of an embodiment of a powder spraying production line and its control method for a spring used in a shock absorber of the present invention;

[0032] Attached marks in the figure: 1. Plastic spraying box; 2. Spring inlet; 3. Spring outlet; 4. Material transport device; 41. Sliding frame; 42. Spring suspension structure; 43. Driving structure; 5. Heating device; 51. Heating lamp body; 6. Plastic spraying device; 61. Processing spray gun; 62. Adjustment mechanism; 63. Detection mechanism; 7. Temperature sensor. DETAILED DESCRIPTION

[0033] Reference Figures 1 to 5 The following is a further description of an embodiment of a spray molding assembly line for a spring for a shock absorber and a control method thereof.

[0034] For ease of explanation, spatial relative terms such as "upper", "lower", "left", "right" and the like are used in the embodiments to illustrate the relationship of one element or feature shown in the figure relative to another element or feature. It should be understood that, in addition to the orientation shown in the figure, the spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figure is inverted, the element described as being "under" other elements or features will be positioned "on" other elements or features. Therefore, the exemplary term "under" can include both upper and lower orientations. The device can be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used here can be interpreted accordingly.

[0035] Furthermore, relational terms such as “first” and “second” and the like are merely used to distinguish one component from another having the same name, but do not necessarily require or imply any such actual relationship or order between these components.

[0036] A spray molding assembly line for springs for shock absorbers, comprising a spray molding box 1, with spring inlets 2 and spring outlets 3 on both sides of the spray molding box 1, a material transport device 4 is provided on the top of the spray molding box 1, the material transport device 4 comprises a sliding frame 41, a spring suspension structure 42 arranged on the sliding frame 41, and a driving structure 43 arranged between the sliding frame 41 and the spring suspension structure 42, the driving structure 43 is used to control the spring suspension structure 42 to move along the length direction of the sliding frame 41 while rotating around the central axis of the spring suspension structure 42, a heating device 5 is also provided in the spray molding box 1, the heating device 5 comprises a plurality of heating lamp bodies 51 arranged on the top of the spray molding box 1, the heating lamp bodies 51 are symmetrically arranged along the length direction of the sliding frame 41, a spray molding device 6 is also provided on the side wall of the spray molding box 1, and temperature sensors 7 are provided in the spring inlet 2, the spring outlet 3 and the spray molding box 1.

[0037] The spray molding device 6 includes a processing spray gun 61 arranged on the side wall of the spray molding box 1, a material storage box arranged on the processing spray gun 61, and an adjustment mechanism 62 and a detection mechanism 63 arranged between the processing spray gun 61 and the spray molding box 1. The adjustment mechanism 62 is used to adjust the relative position of the processing spray gun 61 in the spray molding box 1.

[0038] The present application also provides a control method for a spray-molding assembly line for a spring for a shock absorber, the control method comprising the following steps: S1, pretreatment of the spring: before spray-molding, the surface of the spring to be processed is shot blasted and cleaned to improve the uniformity of the spring surface;

[0039] S2, spring loading: loading the pre-processed spring into the spring suspension structure 42, and setting the pitch of the current spring;

[0040] S3, the plastic spraying box 1 is adapted: the plastic spraying box 1 adjusts the position of the plastic spraying device 6 on the plastic spraying box 1 based on the pitch of the spring to be processed;

[0041] S4, box preheating: start the heating device 5 in the spray box 1, and continue to heat the inside of the spray box 1. The heating time is T. After the T time period, the temperatures of the spring inlet 2, the spring outlet 3 and the inside of the spray box 1 are detected as Wj, Wc and Wn respectively. At the same time, the external temperature is detected as W0. The detected temperatures are compared. If Wj-W0≥20℃, it is judged that the temperature difference between the current external environment and the spring inlet 2 is too large, and the temperature at the spring inlet 2 is too high. Reduce the heating power of the heating lamp body 51 near the spring inlet 2 in the spray box 1, so that the temperature difference between Wj and W0 is small. At 20°C, if Wc-W0≥20°C, it is judged that the temperature difference between the current external environment and the spring outlet 3 is too large, and the temperature at the spring outlet 3 is too high. The heating power of the heating lamp body 51 near the spring outlet 3 in the spray-molded box 1 is reduced to make the temperature difference between Wc and W0 less than 20°C. If the temperature difference between Wn and Wj or Wc is ≥20°C, it is judged that the temperature difference in the current spray-molded box 1 is too large. The spray-molded box 1 adjusts the heating power of each heating lamp body 51 based on the external temperature W0 to make the temperature in the spray-molded box 1 uniform and the temperature difference with the external temperature is small, and jumps to S5 for spring position detection;

[0042] S5, spring detection: start the assembly line, the material transport device 4 drives the spring inside it to move, and at the same time the detection mechanism 63 in the spraying device 6 detects the inside of the spraying box 1. If the detection mechanism 63 does not detect the presence of a spring in the spraying box 1, it is determined that the current spring has not moved into the spraying box 1, and the material transport device 4 continues to move while continuing to detect the inside of the spraying box 1. On the contrary, if the detection mechanism 63 detects the presence of a spring in the spraying box 1, it is determined that the current spring has moved into the spraying box 1, and jump to step S6 to spray the spring;

[0043] S6, spring spraying: the driving structure 43 controls the rotation of the spring, and the spraying device 6 controls the spraying of the spring. During the spraying of the spring, the spraying device 6 reciprocates along the height direction of the spraying box 1, and the movement speed matches the rotation speed of the controlled spring. During the movement of the spraying device 6, the detection mechanism 63 detects the spring. If the detection mechanism 63 detects the spring, the spraying device 6 maintains the current movement direction and continues to move. Otherwise, if the detection mechanism 63 does not detect the spring, it is determined that the spraying device 6 has moved to the top / bottom end of the current spring, and the spraying device 6 changes the movement direction and continues to move.

[0044] Preferably, the spring pretreatment in step S1 comprises the following steps: S11, pre-cleaning the oil stains and impurities on the surface of the spring to ensure that the shot blasting medium can effectively contact the surface;

[0045] S12, the spring surface is shot blasted with cast steel shot for a time of T1, and after the T1 period, ceramic shot blasting is used for fine finishing for a time of T2;

[0046] S13, after shot blasting, remove the residual projectiles and jump to S14 for surface cleaning;

[0047] S14. Use alkaline solution to clean the surface of the spring and remove grease through saponification and emulsification.

[0048] S15. After cleaning is completed, dissolve the non-saponifiable oil by soaking in gasoline.

[0049] Preferably, the control method further includes a spraying effect detection of the spring, comprising the following steps: S7, after the spraying process of the spring is completed, the finished springs are arranged and suspended on the sliding rack 41, and a number of finished springs are randomly selected, and the selected quantity is: 2 at the head end of the sliding rack 41, 2 in the middle part, and 2 at the end;

[0050] S8, inspect the surface of the spring. If there is no surface defect on the spring, the current spring is judged to be qualified, and the process jumps to S9 for adhesion test. Otherwise, the spring is judged to be unqualified and the current spring is placed in the unqualified area.

[0051] S9, sticking tape on the surface of the spring, the tape is attached for T3 time period, after T3 time period, tear off the tape, if the peeling area on the surface of the spring is ≥5%, it is judged that the spray adhesion is poor, the device is unqualified, and the current spring is placed in the unqualified area, otherwise, it is judged that the current spring is qualified, jump to S10 for environmental resistance test;

[0052] S10, immerse the spring in sodium chloride solution for 18 hours, and check whether bubbles, rust or plastic coating peeling appear on the surface of the spring. If not, the current spring is judged to be qualified, otherwise, it is placed in the unqualified area. The qualified spring is cycled from -40°C to 110°C for 5 times to detect the cracking effect of the coating. If the coating state is normal, the spring is judged to be qualified, otherwise it is placed in the unqualified area;

[0053] S11. Count the unqualified springs and record the number of unqualified springs as X. If X=2 at the head end of the sliding frame 41, the springs at the head end of the sliding frame 41 are judged to be unqualified, and 1 / 3 of the springs at the head end are removed for rework. Otherwise, the springs at the head end of the sliding frame 41 are judged to be qualified. If X=2 at the middle part of the sliding frame 41, the springs at the middle part of the sliding frame 41 are judged to be unqualified, and 1 / 3 of the springs at the middle are removed for rework. Otherwise, the springs in the middle part of the sliding frame 41 are judged to be qualified. If X=2 at the end of the sliding frame 41, the springs at the end of the sliding frame 41 are judged to be unqualified, and 1 / 3 of the springs at the end are removed for rework. Otherwise, the springs at the end of the sliding frame 41 are judged to be qualified.

[0054] The present application uses the coordinated driving of the sliding frame 41 and the suspension structure in the material conveying device 4 to enable the spring to move along the length direction of the material conveying device 4 and to rotate synchronously during the movement, and combined with the reciprocating motion of the spraying device 6 in the height direction of the spraying box 1, a three-dimensional dynamic spraying trajectory for the shock absorber spring is realized, so that the spraying position can effectively cover the spiral structure in the spring and the dead angle at the end. At the same time, the heating device 5 is arranged on the top of the spraying box 1, and adopts symmetrically distributed heating lamp bodies 51, which can quickly heat up the inside of the spraying box 1, and the processing efficiency is high. In addition, the inside of the spraying box 1 at the spring inlet 2 and the spring Multi-zone sensors are provided inside the outlet 3 and the spray-molded box 1. The power is adjusted by real-time temperature difference adjustment feedback to ensure that the temperature gradient at each position in the spray-molded box 1 and between the spray-molded box 1 and the outside world is ≤20°C, thereby avoiding the problem of pre-solidification of powder or poor leveling due to local temperature deviation during the spray-molded process, improving the uniformity of the spray-molded plastic, and improving the effect of the finished product. Furthermore, a staged shot blasting method is adopted in the pre-treatment of the spring, and it is cleaned by soaking in alkaline solution and gasoline, which reduces the surface roughness of the shock absorber spring and improves the adhesion of the spray-molded plastic. The above method greatly improves the processing continuity and automation performance, and the effect of use is good.

[0055] Furthermore, the present application detects the temperature difference between various positions in the spray-molded box 1 and the inside of the spray-molded box 1 and the outside world through the temperature sensor 7. When it is detected that the temperature at the spring inlet 2 or the spring outlet 3 is ≥20°C different from the outside world / inside the spray-molded box 1, the power of the heating lamp body 51 in the corresponding area can be automatically reduced, so that the outside temperature-the spring inlet / outlet temperature-the inside temperature of the spray-molded box 1 tends to balance. For example, when the outside temperature is 25°C, the temperature inside the box can be stably and evenly maintained at around 45°C, avoiding uneven cross-linking of the coating due to ambient temperature fluctuations and reducing the curing defect rate.

[0056] At the same time, the spray-molding device 6 can automatically adjust the position based on the pitch of the spring, and can provide real-time feedback on the spring position through the detection mechanism 63, thereby achieving the matching of the spray gun movement speed, the spring movement speed and the spring rotation speed, so that the spring spiral gap can be accurately covered during the spray-molding process, avoiding the problem of coating accumulation or omission caused by changes in the pitch of different shock absorber springs, and improving the qualified rate of finished products.

[0057] Furthermore, after the shock absorber spring is processed, different positions of the shock absorber spring are tested in stages. Specifically, during processing, the powder residue in the spray-molding device 6 will affect the spray-molding effect of the shock absorber spring to a certain extent. By respectively extracting the finished spring products at the head end, the middle part and the tail end of the sliding frame 41, the detection range includes each powder residue stage, thereby improving the accuracy of the detection, so that the distribution area of ​​defective products can be quickly located, targeted rework can be carried out, and material loss can be reduced. At the same time, extreme environments can be simulated during testing to ensure that the finished product has a high anti-cracking performance and meets the use requirements of the finished shock absorber spring.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A spray-molding production line for springs for shock absorbers, comprising a spray-molding box (1), with spring inlets (2) and spring outlets (3) being provided on both sides of the spray-molding box (1), characterized in that: A material transport device (4) is provided on the top of the spray molding box (1), and the material transport device (4) comprises a sliding frame (41), a spring suspension structure (42) arranged on the sliding frame (41), and a driving structure (43) arranged between the sliding frame (41) and the spring suspension structure (42), and the driving structure (43) is used to control the spring suspension structure (42) to move along the length direction of the sliding frame (41) and rotate around the central axis of the spring suspension structure (42). A heating device (5) is also provided in the spray molding box (1), and the heating device (5) comprises a plurality of heating lamp bodies (51) arranged on the top of the spray molding box (1), and the heating lamp bodies (51) are symmetrically arranged along the length direction of the sliding frame (41). A spray molding device (6) is also provided on the side wall of the spray molding box (1), and temperature sensors (7) are provided in the spring inlet (2), the spring outlet (3) and the spray molding box (1).

2. A spraying line for springs for shock absorbers according to claim 1, characterized in that: The plastic spraying device (6) comprises a processing spray gun (61) arranged on the side wall of the plastic spraying box (1), a material storage box arranged on the processing spray gun (61), and an adjustment mechanism (62) and a detection mechanism (63) arranged between the processing spray gun (61) and the plastic spraying box (1), wherein the adjustment mechanism (62) is used to adjust the relative position of the processing spray gun (61) in the plastic spraying box (1).

3. A control method for a plastic spraying line for a shock absorber spring according to claim 1-2, characterized in that: The following steps are involved: S1. Pretreatment of springs: Before spraying, the surface of the spring to be processed is shot blasted and cleaned to improve the uniformity of the spring surface; S2, spring loading: loading the pre-processed spring into the spring suspension structure (42), and setting the thread pitch of the current spring; S3, the plastic spraying box (1) is adapted: the plastic spraying box (1) adjusts the position of the plastic spraying device (6) on the plastic spraying box (1) based on the pitch of the spring to be processed; S4, box preheating: start the heating device (5) in the plastic spray box (1) to continuously heat the inside of the plastic spray box (1) for a heating time of T. After the T time period, respectively detect the temperatures of the spring inlet (2), the spring outlet (3) and the inside of the plastic spray box (1) as Wj, Wc and Wn, and detect the outside temperature as W0. Compare the detected temperatures. If Wj-W0≥20°C, it is determined that the temperature difference between the current outside environment and the spring inlet (2) is too large, and the temperature at the spring inlet (2) is too high. Reduce the heating power of the heating lamp body (51) near the spring inlet (2) in the plastic spray box (1) so that the temperature difference between Wj and W0 is If the temperature difference between Wc and W0 is less than 20°C, if Wc-W0≥20°C, it is judged that the temperature difference between the current external environment and the spring outlet (3) is too large, and the temperature at the spring outlet (3) is too high. The heating power of the heating lamp body (51) near the spring outlet (3) in the spray molding box (1) is reduced so that the temperature difference between Wc and W0 is less than 20°C. If the temperature difference between Wn and Wj or Wc is ≥20°C, it is judged that the temperature difference in the current spray molding box (1) is too large. The spray molding box (1) adjusts the heating power of each heating lamp body (51) based on the external temperature W0, so that the temperature in the spray molding box (1) is uniform and the temperature difference with the external temperature is small, and jumps to S5 to perform spring position detection. S5, spring detection: start the production line, the material transport device (4) drives the spring inside it to move, and at the same time the detection mechanism (63) in the plastic spraying device (6) detects the inside of the plastic spraying box (1). If the detection mechanism (63) does not detect the presence of a spring in the plastic spraying box (1), it is determined that the current spring has not moved into the plastic spraying box (1), and the material transport device (4) continues to move while continuing to detect the inside of the plastic spraying box (1). On the contrary, if the detection mechanism (63) detects the presence of a spring in the plastic spraying box (1), it is determined that the current spring has moved into the plastic spraying box (1), and the process jumps to step S6 to spray the spring. S6, spring spraying: the driving structure (43) controls the spring to rotate, and at the same time the spraying device (6) controls the spring to spray. During the spraying process, the spraying device (6) reciprocates along the height direction of the spray box (1), and the movement speed matches the rotation speed of the spring. During the movement of the spraying device (6), the detection mechanism (63) detects the spring. If the detection mechanism (63) detects the spring, the spraying device (6) maintains the current movement direction and continues to move. On the contrary, if the detection mechanism (63) does not detect the spring, it is determined that the spraying device (6) has moved to the top end / bottom end of the current spring, and the spraying device (6) changes the movement direction and continues to move.

4. The control method of a spraying assembly line for a spring for a shock absorber according to claim 3, characterized in that: The spring pretreatment in step S1 includes the following steps: S11. Clean the oil and impurities on the surface of the spring in advance to ensure that the shot blasting medium can effectively contact the surface; S12, shot blasting the spring surface with cast steel shot, the shot blasting time is T1, after the T1 period, switch to ceramic shot blasting for fine finishing, the shot blasting time is T2; S13, after shot blasting, remove the residual shot and jump to S14 for surface cleaning; S14. Use alkaline solution to clean the surface of the spring and remove grease through saponification and emulsification. S15. After cleaning is completed, dissolve the non-saponifiable oil by soaking in gasoline.

5. The control method of a spraying assembly line for a spring for a shock absorber according to claim 3, characterized in that: The control method further includes a spraying effect detection of the spring, comprising the following steps: S7, after the spraying process of the spring is completed, the finished springs are arranged and suspended on the sliding frame (41), and a number of finished springs are randomly selected, and the selected quantity is: 2 at the head end of the sliding frame (41), 2 in the middle part, and 2 at the end; S8, inspect the surface of the spring. If there is no surface defect on the spring, the current spring is judged to be qualified, and the process jumps to S9 for adhesion test. Otherwise, the spring is judged to be unqualified and the current spring is placed in the unqualified area. S9, sticking tape on the surface of the spring, the tape is attached for T3 time period, after T3 time period, tear off the tape, if the peeling area on the surface of the spring is ≥5%, it is judged that the spray adhesion is poor, the device is unqualified, and the current spring is placed in the unqualified area, otherwise, it is judged that the current spring is qualified, jump to S10 for environmental resistance test; S10, immerse the spring in sodium chloride solution for 18 hours, and check whether bubbles, rust or plastic coating peeling appear on the surface of the spring. If not, the current spring is judged to be qualified, otherwise, it is placed in the unqualified area. The qualified spring is cycled from -40°C to 110°C for 5 times to detect the cracking effect of the coating. If the coating state is normal, the spring is judged to be qualified, otherwise it is placed in the unqualified area; S11. Count the unqualified springs and record the number of unqualified springs as X. If X=2 at the head end of the sliding frame (41), the springs at the head end of the sliding frame (41) are judged to be unqualified and 1 / 3 of the springs at the head end are removed for rework. Otherwise, the springs at the head end of the sliding frame (41) are judged to be qualified. If X=2 at the middle part of the sliding frame (41), the springs at the middle part of the sliding frame (41) are judged to be unqualified and 1 / 3 of the springs at the middle are removed for rework. Otherwise, the springs at the middle part of the sliding frame (41) are judged to be qualified. If X=2 at the end of the sliding frame (41), the springs at the end of the sliding frame (41) are judged to be unqualified and 1 / 3 of the springs at the end are removed for rework. Otherwise, the springs at the end of the sliding frame (41) are judged to be qualified.

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