An electric push rod and its production line and production process

Abstract

The present application discloses an electric push rod and its production line and production process, which includes a support tube plastic shell, a ball socket assembly, a motor end plastic shell, a screw outer shell, a screw, a screw nut tube, a sealing ring and a spring; two ball socket assemblies are arranged at both ends of the support tube plastic shell and the motor end plastic shell; the screw outer shell is provided with a flat push bearing at the position where the screw passes through, and the screw outer shell is provided with a gasket on the back of the flat push bearing, and the flat push bearing is pressed against the end of the screw outer shell by a spring; the output end of the reduction box is connected to the screw through a damper; the ball socket assembly, the motor end plastic shell and the screw outer shell at the end of the motor end plastic shell are integrally laser welded. The damper is connected to the screw, giving the screw a damping torque to prevent the tailgate from falling down, so that the tailgate has a better hovering effect and optimizes the performance of the electric push rod.

Description

Technical Field

[0001] The present application relates to the technical field of electric push rods, and in particular to an electric push rod and its production line and production process. Background Art

[0002] An electric push rod is an electric drive device that converts the rotational motion of an electric motor into the linear reciprocating motion of a push rod. It can be used as an actuator and is mostly used as a motion drive unit in industries such as home appliances, kitchen utensils, medical equipment, and automobiles. Traditional linear electric push rods use a rigid coupling to connect the lead screw and the motor drive shaft to achieve transmission.

[0003] At present, some of the electric tailgate struts on the market still use traditional structures. The resistance of the struts is mainly due to the friction of the motor reducer and the rotation of the parts. These frictions are often unable to resist the weight of the tailgate. Therefore, the tailgate will fall down during operation, and some even cannot hover. Therefore, the same electric tailgate struts need to be installed on both sides of the tailgate to solve the above problems. At present, there are roughly two types of electric struts on the market, one is a single-pole electric strut and the other is a double-pole electric strut. Although the single-pole electric strut has a lower cost, the overall effect is poor, the operation is unstable, and the tailgate will shake when it is about to close. Summary of the invention

[0004] In order to improve the problem that the electric push rod may shake the tailgate when the tailgate is about to close, the present application provides an electric push rod and its production line and production process.

[0005] The electric push rod provided in this application adopts the following technical solution:

[0006] An electric push rod comprises a support tube plastic shell, a ball socket assembly, a motor end plastic shell, a screw rod outer shell, a screw rod, a screw rod nut tube, a sealing ring and a spring; two ball socket assemblies are arranged at both ends of the support tube plastic shell and the motor end plastic shell; a motor reduction box assembly is installed in the motor end plastic shell, and the motor reduction box assembly comprises a motor and a reduction box, the end of the screw rod without a thread passes through the screw rod outer shell and is connected to the output end of the reduction box, the screw rod outer shell is rotatably connected to the screw rod through a bearing, the sealing ring is arranged in the motor end plastic shell at a position where the screw rod is not threaded, and the screw rod outer shell is connected to the screw rod through a bearing. A sealing ring is also provided between the body and the sealing ring; the screw rod and the screw rod nut tube are spirally matched, the screw rod nut tube is fixedly connected to the inner wall of the plastic shell of the support tube, the spring sleeve is arranged on the inner wall of the plastic shell at the motor end and the outer wall of the plastic shell of the support tube, and the screw rod outer shell is provided with a thrust bearing at the position where the screw rod passes through, and a gasket 49 is provided on the back of the thrust bearing of the screw rod outer shell, and the thrust bearing is pressed against the end of the screw rod outer shell by the spring; the output end of the reduction box and the screw rod are connected through a damper; the ball and socket assembly at the end of the plastic shell at the motor end, the plastic shell at the motor end and the screw rod outer shell are integrated by laser welding.

[0007] Optionally, a Hall plate is installed on the upper end of the motor, and the Hall plate is used to sense current changes to cut off or start power supply to the motor to complete the closing or opening action of the tailgate.

[0008] The production line of an electric push rod provided in this application adopts the following technical solution:

[0009] A production line for an electric push rod, comprising in sequence a screw rod processing system, a press-fit bushing system, a motor component assembly system, a spring oil injection system, a general assembly system and a performance detection system;

[0010] The spring oil spraying system includes a spraying device for spraying grease on the spring and a detection device for detecting whether the spring has been sprayed. The detection device includes a bracket, a detection frame lifted and lowered on the bracket, a detection rod rotatably set on the detection frame, a light inspection mechanism for illuminating the inner side of the spring, a marking mechanism for marking defects in the spring spraying, and a quick-drying mechanism for drying the undried position of the spring grease; the detection rod is inserted into the spring.

[0011] Optionally, the optical inspection mechanism includes a light source, two plane mirrors and a camera, an optical inspection cavity is arranged in the detection rod, the optical inspection cavity is arranged in an L shape, the horizontal section of the optical inspection cavity is arranged as an opening, the camera is fixed in the vertical section of the optical inspection cavity, the light source is fixed at the upper end of the opening of the horizontal section of the optical inspection cavity, the light source is opposite to the inner wall of the spring, the plane mirror is fixed at the corner of the horizontal section and the vertical section in the optical inspection cavity, and the angle between the plane mirror and the horizontal section or the vertical section of the optical inspection cavity is 45°.

[0012] Optionally, the marking mechanism includes a marking tank filled with fluorescent powder, a brush, a transport component for transporting the brush, and a trigger component for controlling the movement of the transport component. The detection rod is provided with a marking cavity below the horizontal section of the optical inspection cavity. The marking tank is arranged on the transport component. The brush is moved by the transport component to abut against the position of the spring grease defect. The marking tank is provided with a discharge port, and an electromagnetic valve is installed on the discharge port.

[0013] Optionally, the transport assembly includes a transport frame slidably arranged in the marking chamber, two winding rollers rotatably arranged on the transport frame, a transport member mounted on the two transport members, and a control unit for controlling the rotation of any one of the winding rollers. The marking tank is fixed on the transport frame, the brush is fixed on the upper surface of the transport member and the bristles on the brush are facing the discharge port.

[0014] Optionally, the control part includes a first electric push rod, a control rope, a rack fixedly connected to the end of the control rope, a gear meshing with the rack, and a first fixed pulley; the detection rod is provided with a control chamber connected to the marking chamber; the first electric push rod is fixed at the top of the detection rod; the head end of the control rope is fixedly connected to the output end of the first electric push rod; the first fixed pulley is rotatably arranged in the marking chamber and guides the position where the control rope is connected to the rack to be horizontal; the rack is elastically arranged on the transport frame and the gear is rotatably arranged on the transport frame; the gear is coaxially fixed with the corresponding winding roller.

[0015] Optionally, the trigger assembly includes a second electric push rod, a trigger rope, a second fixed pulley and an elastic member, the transport frame and the marking cavity are elastically arranged along the horizontal direction through the elastic member, the second electric push rod is also fixed to the top end of the detection rod and one end of the trigger rope is fixedly connected to the output end of the second electric push rod, the second fixed pulley is also arranged in the marking cavity, the end of the trigger rope is fixedly connected to the transport frame after passing around the second fixed pulley, and the part of the trigger rope after passing around the second fixed pulley is also arranged horizontally.

[0016] Optionally, the quick-drying mechanism includes an air supply component, an air duct arranged above the optical inspection cavity, an air outlet connected to the end of the air duct, and a swing component for controlling the swing of the air outlet, the air supply component is arranged in the external environment, the air duct passes through the detection rod, and the air outlet is inclined and directly opposite to the position of the spring corresponding to the optical inspection cavity.

[0017] The production process of an electric push rod provided in this application adopts the following technical solution:

[0018] A production process of an electric push rod comprises the following steps:

[0019] The end of the screw is riveted, the screw is sprayed with oil, and the nut tube is installed;

[0020] Bushing press-fitting, bearing press-fitting, and riveting bearing retaining rings;

[0021] Motor component assembly, laser welding;

[0022] Spring oil injection;

[0023] Check whether the grease inside and outside the spring meets the standards;

[0024] Assembly: Spring press-fit, buckle ball and socket assembly;

[0025] Strut performance testing and laser marking.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] 1. When the motor rotates and is decelerated by the reduction box, it drives the lead screw to rotate. The lead screw rotates through its lead screw nut, thereby realizing the telescopic movement between the plastic housing at the motor end and the plastic housing of the support tube. The damper is connected to the lead screw to give the lead screw a damping torque to prevent the tailgate from falling down, so that the tailgate has a better hovering effect and optimizes the performance of the electric actuator;

[0028] 2. When the detection rod is gradually put into the inner side of the spring, the light source is turned on, and the light source illuminates the corresponding position of the opening of the light detection cavity inside the spring. At this time, the camera records the situation inside the spring reflected by the plane mirror. The staff only needs to observe the spring situation recorded by the camera to determine whether there is a position where the grease is unevenly sprayed or not dried inside the spring. In addition, combined with the rotation of the detection rod inside the spring, the inside of the spring can be fully inspected;

[0029] 3. The bristles on the brush are facing the discharge port, that is, when the discharge port is opened, the fluorescent powder falls onto the brush, and the first electric push rod is controlled to move upward. Under the action of the first fixed pulley, the control rope pulls the rack to move in the direction away from the spring. Under the friction between the two winding rollers and the transport member, the transport member begins to rotate toward the inside of the spring, and the transport member moves the brush toward the inner wall of the spring. When the brush moves to the outermost side of the transport member, the brush abuts against the inner wall of the spring and the brush is squeezed, and the fluorescent powder on the brush adheres to the spring. In this embodiment, it is assumed that the fluorescent powder will not fall to other positions. Even if the fluorescent powder is scattered, the position where the inner wall of the spring abuts against the brush has the most fluorescent powder. Therefore, the staff only needs to observe whether there is fluorescent powder on the inner wall of the spring or the position with the most fluorescent powder is the position where the grease on the spring is defective. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the first embodiment of the present application;

[0031] Figure 2 is a cross-sectional schematic diagram of the first embodiment of the present application;

[0032] Figure 3 It is a schematic diagram of the overall structure of the second embodiment of the present application;

[0033] Figure 4 is a schematic diagram of the detection device in Example 2 of the present application;

[0034] Figure 5 It is a schematic diagram of the transport component in Example 2 of the present application.

[0035] Figure numerals: 1, support tube plastic shell; 2, motor; 3, reducer; 4, lead screw; 5, lead screw nut tube; 6, sealing ring; 7, spring; 8, bearing; 9, motor end plastic shell; 10, ball and socket assembly; 11, damper; 12, Hall plate; 13, frame; 14, nozzle; 15, rotating frame; 16, clamp; 17, bracket; 18, detection frame; 19, detection rod; 20, light source; 21, plane mirror; 22, camera; 23, optical inspection chamber; 24, marking tank; 25, brush; 26, marking chamber ; 27. Feeding port; 28. Solenoid valve; 29. ​​Transport rack; 30. Winding roller; 31. Transport member; 32. First electric push rod; 33. Control rope; 34. Rack; 35. Gear; 36. First fixed pulley; 37. Control chamber; 38. Second electric push rod; 39. Trigger rope; 40. Second fixed pulley; 41. Blowing pump; 42. Blowing box; 43. Heating member; 44. Air duct; 45. Air outlet; 46. Swing rope; 47. Third electric push rod; 48. Screw rod outer shell; 49. Gasket; 50. Push bearing. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1-5 This application is described in further detail.

[0037] Embodiment 1

[0038] The present application embodiment discloses an electric push rod. Figure 1 and Figure 2 , an electric push rod comprises a support tube plastic shell 1, a ball and socket assembly 10, a motor end plastic shell 9, a screw outer shell 48, a screw 4, a screw nut tube 5, a sealing ring 6 and a spring 7;

[0039] The ball and socket assembly 10 at the end of the motor end plastic housing 9, the motor end plastic housing 9 and the screw outer housing 48 are integrally laser welded; two ball and socket assemblies 10 are arranged at both ends of the support tube plastic housing 1 and the motor end plastic housing 9;

[0040] The motor reducer assembly is installed in the motor end plastic housing 9, and the motor reducer assembly includes a motor 2 and a reducer 3. The end of the screw rod 4 without a thread passes through the screw rod outer housing 48 and is connected to the output end of the reducer 3. The screw rod outer housing 48 is rotatably connected to the screw rod 4 through the bearing 8. The sealing ring 6 is arranged in the motor end plastic housing 9 at the position where the screw rod 4 is not threaded, and a sealing ring is also arranged between the screw rod outer housing 48 and the sealing ring 6;

[0041] The screw rod 4 is spirally matched with the screw rod nut tube 5, the screw rod nut tube 5 is fixedly connected to the inner wall of the support tube plastic shell 1, the spring 7 is sleeved on the inner wall of the motor end plastic shell 9 and the outer wall of the support tube plastic shell 1, the screw rod outer shell 48 is provided with a thrust bearing 50 at the position where the screw rod 4 passes through, and the screw rod outer shell 48 is provided with a gasket 49 on the back of the thrust bearing 50, and the thrust bearing 50 is pressed against the end of the screw rod outer shell 48 by the spring 7; and in this embodiment, the two ball and socket assemblies 10 are respectively connected to the vehicle and the tailgate; when electric control is performed, the motor 2 starts to rotate and drives the screw rod 4 to rotate through the reducer 3, and the screw rod nut tube 5 matched with it moves axially through the spiral pattern on the screw rod 4, and the screw rod nut tube 5 is driven to move up and down in a straight line through the forward and reverse rotation of the motor 2, thereby realizing the telescopic function of the electric push rod.

[0042] Reference Figure 1 and Figure 2 The output end of the reducer 3 is connected to the screw rod 4 through a damper 11. In this embodiment, the damper 11 includes a brake coupling, a brake jacket, a brake gasket, a brake friction pad, a brake disc spring, and a brake threaded end cover. The brake jacket, the brake gasket, the brake friction pad, the brake disc spring, and the brake threaded end cover are sleeved on the brake coupling. The internal space of the brake jacket is a structure that is wide at the top and narrow at the bottom. The lower part of the brake jacket is attached to the lower part of the brake coupling. Two brake gaskets are located above the attached part of the brake coupling and the brake jacket. A brake friction pad is provided between the two brake gaskets, and a brake disc is provided on the brake gasket. shaped spring piece, a brake threaded end cover is provided on the brake disc spring piece, and the damper 11 also adopts the technical means in this field, and the specific connection method is no longer repeated in this embodiment; in this embodiment, the fixing seat of the damper 11 is connected to the motor 2, and the damper 11 is used to connect the reducer 3 and the screw 4. When the motor 2 rotates and is decelerated by the reducer 3, it drives the screw 4 to rotate, and the screw 4 rotates through its screw nut tube 5, thereby realizing the telescopic movement between the support tube plastic shell 1 and the motor end plastic shell 9, wherein the damper 11 is connected to the screw 4, giving the screw 4 a damping torque to prevent the tailgate from falling down, so that the tailgate has a better hovering effect, and optimizes the performance of the electric push rod.

[0043] Reference Figure 1 and Figure 2, a Hall plate 12 is installed on the upper end of the motor 2. The Hall plate 12 is used to sense the current change to cut off or start the power supply of the motor 2 to complete the closing or opening of the tailgate. When the electric push rod is working, the Hall element will monitor the movement state of the push rod in real time and output the corresponding Hall voltage signal; this signal will be transmitted to the feedback circuit and compared with the preset reference value. If the movement state of the push rod does not match the preset value, the feedback circuit will adjust the current of the motor 2, thereby changing the movement state of the push rod to reach the preset position or speed; specifically, if the push rod moves too fast or too slow, the feedback circuit will increase or decrease the current of the motor 2 to speed up or slow down the movement speed of the push rod. If the push rod deviates from the preset position, the feedback circuit will adjust the rotation direction of the motor 2 to return the push rod to the correct position.

[0044] Embodiment 2

[0045] The present application embodiment discloses a production line of an electric push rod. Figure 3 and Figure 4 A production line of an electric push rod includes a screw processing system, a press-fit bushing system, a motor 2 component assembly system, a spring 7 oil spraying system, a general assembly system and a performance detection system; the spring 7 oil spraying system includes a spraying device for spraying grease on the spring 7 and a detection device for detecting whether the spring 7 is sprayed. The spraying device includes a frame 13, a rotating frame 15 rotatably connected to the frame 13, a plurality of fixed frames fixed on the rotating frame 15, two clips 16 for clamping the spring 7 respectively, and a reciprocating nozzle 14. The drive of the rotating frame 15 is controlled by the motor 2, and the plurality of fixed frames are fixed on the rotating frame 15 at equal intervals. The two clips 16 are respectively installed on the upper and lower ends of the fixing frame and are respectively used to be fixed on the two ends of the spring 7. The nozzle 14 is used to spray grease on the spring 7. The reciprocating motion of the nozzle 14 is realized by an electric push rod or a cylinder; the two ends of the spring 7 are respectively fixed by two clips 16, and the nozzle 14 is facing the spring 7. The nozzle 14 is controlled to start spraying grease and reciprocating. The reciprocating stroke is greater than the length of the spring 7, thereby achieving the effect of spraying grease on the spring 7. When the spraying of one spring 7 is completed, the rotating frame 15 is controlled to rotate to rotate the next spring 7 to the position of the nozzle 14, and the next spring 7 is sprayed until the spraying of all springs 7 is completed.

[0046] The detection device includes a bracket 17, a detection frame 18 which is lifted and arranged on the bracket 17, a detection rod 19 which is rotatably arranged on the detection frame 18, a light detection mechanism for detecting light on the inner side of the spring 7, a marking mechanism for marking defects in the spraying of the spring 7, and a quick-drying mechanism for drying the undried position of the grease of the spring 7; the bracket 17 is fixed on the frame 13 and is located above the rotating frame 15. When the spring 7 is sprayed, the detection frame 18 is away from the rotating frame 15 to prevent the detection rod 19 from being contaminated when the grease is sprayed from the nozzle 14. The lifting and lowering of the detection frame 18 is also achieved by an electric push rod or a cylinder. The top end of the detection rod 19 is rotatably connected to the detection frame 18 and the rotation of the detection rod 19 is controlled by a servo motor. The detection rod 19 is located at the center of the spring 7. The clip 16 of this embodiment fixes the side wall of the spring 7, and the fixed position of the clip 16 does not affect the spraying work of the spring 7. The light inspection mechanism performs light inspection on the inside of the spring 7. If it is found that the grease spraying on the inside of the spring 7 is uneven, the corresponding position of the spring 7 is marked by the marking mechanism, and re-spraying or repair is required later. If the spring 7 is not dried thoroughly and the grease is not dried, the quick-drying mechanism is required to dry the grease of the spring 7.

[0047] Reference Figure 3 and Figure 4 The optical inspection mechanism includes a light source 20, two plane mirrors 21 and a camera 22. An optical inspection cavity 23 is arranged in the detection rod 19. The optical inspection cavity 23 is arranged in an L shape. The horizontal section of the optical inspection cavity 23 is arranged in an opening setting. The camera 22 is fixed in the vertical section. The light source 20 is fixed at the opening of the horizontal section of the optical inspection cavity 23. The light source 20 is preferably arranged in an inclined manner and faces the position of the opening of the optical inspection cavity 23 to improve the effect of detecting the inner side of the spring 7. The light source 20 also faces the inner wall of the spring 7. The plane mirror 21 is fixed at the corner of the horizontal section and the vertical section of the optical inspection cavity 23. The plane mirror 21 and the optical inspection cavity 23 are arranged in an L shape. 3 has an angle of 45°. When the detection rod 19 is gradually placed inside the spring 7, the light source 20 is turned on. The light source 20 illuminates the corresponding position of the opening of the light detection cavity 23 inside the spring 7. At this time, the camera 22 records the situation of the inside of the spring 7 reflected by the plane mirror 21. The staff only needs to observe the situation of the spring 7 recorded by the camera 22 to determine whether there is a position where the grease is unevenly sprayed or not dried inside the spring 7. In addition, combined with the rotation of the detection rod 19 inside the spring 7, the inside of the spring 7 can be fully inspected.

[0048] Reference Figure 4 and Figure 5The marking mechanism includes a marking tank 24 filled with fluorescent powder, a brush 25, a transport assembly for transporting the brush 25, and a trigger assembly for controlling the movement of the transport assembly. The horizontal section of the light inspection cavity 23 is provided with a marking cavity 26, and the side of the marking cavity 26 facing the spring 7 is an opening. The marking tank 24 is arranged on the transport assembly, and the marking tank 24 is provided with a discharge port 27, and a solenoid valve 28 is installed on the discharge port 27. The fluorescent powder is selected from materials that present different colors under the condition of light. When the light source 20 is started, it can It is sufficient for the staff to observe that the brush 25 is moved by the transport component to the position causing the grease defect on the spring 7, and the bristles on the brush 25 are facing the discharge port 27, that is, when the discharge port 27 is opened, the fluorescent powder falls onto the brush 25. In this embodiment, the opening of the discharge port 27 is larger than the size of the brush 25, and the discharge port 27 can cover the bristles on the brush 25; the transport component includes a transport frame 29 slidably arranged in the marking cavity 26, two winding rollers 30 rotatably arranged on the transport frame 29, The transport member 31 is sleeved on the two transport members 31 and the control unit for controlling the rotation of any winding roller 30. In this embodiment, the transport member 31 can be made of absorbent paper or other rubber materials that are easy to adhere to grease. The marking tank 24 is fixed on the transport frame 29, and the brush 25 is fixed on the upper surface of the transport member 31. When the brush 25 is in the initial position, the brush 25 is located in the discharge port 27. When the two winding rollers 30 start to drive the transport member 31 to start rotating, the transport member 31 moves the brush 25 toward the position of the spring 7. When the brush 25 moves to the outermost side of the transport member 31, the brush 25 abuts against the inner wall of the spring 7 and the brush 25 is squeezed, and the fluorescent powder on the brush 25 adheres to the spring 7. In this embodiment, it is assumed that the fluorescent powder will not fall to other positions. Even if the fluorescent powder is scattered, the position where the inner wall of the spring 7 abuts against the brush 25 has the most fluorescent powder. Therefore, the staff only needs to observe whether there is fluorescent powder on the inner wall of the spring 7 or the position with the most fluorescent powder is the position where the grease on the spring 7 is defective.

[0049] Reference Figure 4 and Figure 5The control unit includes a first electric push rod 32, a control rope 33, a rack 34 fixedly connected to the end of the control rope 33, a gear 35 meshing with the rack 34, and a first fixed pulley 36. The first electric push rod 32 is fixed to the top of the detection rod 19, and the movement direction of the first electric push rod 32 is vertical. The head end of the control rope 33 is fixedly connected to the output end of the first electric push rod 32, and the first fixed pulley 36 is rotatably set in the marking cavity 26, so that the position where the control rope 33 is connected to the rack 34 is guided to a horizontal position, that is, the control rope 33 is in a vertical state at the first fixed pulley 36 position, the rack 34 slides on the transport frame 29 and the gear 35 is rotatably set on the transport frame 29, and the gear 35 is coaxially fixed with the corresponding winding roller 30. In this embodiment, the winding roller 30 located on the inner side is coaxially fixed with the gear 35; when the transport member 31 is required to drive the brush 25 to move, the control The first electric push rod 32 moves upward, and under the action of the first fixed pulley 36, the control rope 33 pulls the rack 34 to move in the direction away from the spring 7. Under the friction between the two winding rollers 30 and the transport member 31, the transport member 31 begins to rotate toward the inner side of the spring 7, and the transport member 31 moves the brush 25 toward the inner wall of the spring 7. In this embodiment, the rack 34 and the transport frame 29 are elastically arranged, that is, an elastic member is fixedly connected between one end of the rack 34 and the wall surface of the transport frame 29. The elastic member can be set as a spring or an elastic strip. When the rack 34 moves in the direction away from the spring 7, the elastic member is in a stretched state. When the brush 25 is coated with fluorescent powder, the first electric push rod 32 can be moved downward, the gear 35 and the rack 34 are reset, and the transport member 31 also returns the brush 25 to the initial position, that is, the brush 25 is located in the discharge port 27.

[0050] Reference Figure 4 and Figure 5The trigger assembly includes a second electric push rod 38, a trigger rope 39, a second fixed pulley 40 and an elastic member. The transport frame 29 and the marking cavity 26 are elastically arranged in the horizontal direction through the elastic member. The elastic member can also be a spring or an elastic strip. The marking cavity is fixedly connected to two support plates, and a sliding rod is fixedly connected between the two support plates. The transport frame 29 is fixedly connected to a slider, and the slider is sleeved outside the sliding rod. The two ends of the elastic member are respectively fixedly connected to the slider and any one of the ear plates. The second electric push rod 38 is also fixed to the top of the detection rod 19 and one end of the trigger rope 39 is fixedly connected to the output end of the second electric push rod 38. The second fixed pulley 40 is also arranged in the marking cavity 26. The end of the trigger rope 39 passes around the second fixed pulley 40 and is fixedly connected to the transport frame 29, and the part of the trigger rope 39 that passes around the second fixed pulley 40 is also arranged horizontally; the initial position of the transport frame 29, that is, the outermost end of the transport member 31 is close to the inner wall of the spring 7, that is, to ensure that the brush 25 can be driven by the transport member 31 to the position in contact with the inner wall of the spring 7. When there is grease on the inside of the spring 7 that has not dried, in order to prevent the grease from dripping randomly and polluting the environment, it is necessary to control the transport frame 29 to drive the transport frame 29 to move to the bottom of the corresponding position of the spring 7, that is, the transport member 31 is inserted between the spring coils of the spring 7, and the grease falls onto the transport member 31.

[0051] In the initial position, the elastic member is in a compressed and deformed state. At this time, when the second electric push rod 38 moves downward, the first electric push rod 32 also starts to release the control rope 33. It is only necessary to ensure that the transport frame 29 and the transport member 31 do not move relative to each other, that is, the position of the rack 34 does not change during the movement of the transport frame 29. At this time, the transport member 31 will not be driven to rotate. As the second electric push rod 38 sends out the trigger rope 39 downward, the transport frame 29 is driven to move toward the inner circle of the spring 7 until the transport member 31 moves to below the corresponding spring coil of the spring 7. At this time, the grease-free position of the spring 7 can be dried.

[0052] Reference Figure 4 and Figure 5The quick-drying mechanism includes an air supply component, an air duct 44 arranged above the optical inspection chamber 23, an air outlet 45 connected to the end of the air duct 44, and a swing component for controlling the swing of the air outlet 45. The air supply component includes a blow pump 41, a blow box 42 and a heating element 43. The output end of the blow pump 41 is connected to the blow box 42. The heating element 43 is set as an electric heating wire and fixed in the blow box 42. The air duct 44 passes through the detection rod 19 and is connected to the air outlet 45. The air outlet 45 is tilted and faces the position of the spring 7 corresponding to the optical inspection chamber 23. The swing direction of the air outlet 45 is set along the horizontal direction. The swing component includes a third electric push rod 47, a swing rope 46 and a torsion spring The axis of rotation between the air outlet 45 and the detection rod 19 is set vertically, and the torsion spring is used to connect the detection rod 19 and the air outlet 45. The output end of the third electric push rod 47 is connected to the swing rope 46. The swing rope 46 passes through the inside of the detection rod 19 and is fixedly connected to the outer wall of the air outlet 45. The swing rope 46 is located on the plane where the air outlet 45 swings. When the third electric push rod 47 pulls or releases the swing rope 46 in the vertical direction, the reciprocating swing effect of the air outlet 45 is achieved with the cooperation of the elastic force of the torsion spring, and the hot air blown out can then dry the position where the grease has not dried. Since the transport part 31 is located below the air outlet, there is no need to worry about whether the undried grease will fall off.

[0053] The implementation principle of the production line of an electric push rod in the embodiment of the present application is as follows: when the detection rod 19 is gradually put into the inner side of the spring 7, the light source 20 is turned on at this time, and the light source 20 illuminates the corresponding position of the opening of the light detection cavity 23 on the inner side of the spring 7. At this time, the camera 22 records the situation of the inner side of the spring 7 reflected by the plane mirror 21. The staff only needs to observe the situation of the spring 7 recorded by the camera 22 to determine whether there is a position where the grease is unevenly sprayed or a position that is not dried on the inner side of the spring 7. In addition, combined with the rotation of the detection rod 19 on the inner side of the spring 7, the inner side of the spring 7 can be fully inspected;

[0054] The bristles on the brush 25 are facing the discharge port 27, that is, when the discharge port 27 is opened, the fluorescent powder falls onto the brush 25, and the first electric push rod 32 is controlled to move upward. Under the action of the first fixed pulley 36, the control rope 33 pulls the rack 34 to move in the direction away from the spring 7. Under the friction between the two winding rollers 30 and the transport member 31, the transport member 31 begins to rotate toward the inside of the spring 7, and the transport member 31 moves the brush 25 toward the inner wall of the spring 7. When the brush 25 moves to the outermost side of the transport member 31, the brush 25 abuts against the inner wall of the spring 7 and the brush 25 is squeezed, and the fluorescent powder on the brush 25 adheres to the spring 7. In this embodiment, it is assumed that the fluorescent powder will not fall to other positions. Even if the fluorescent powder is scattered, the position where the inner wall of the spring 7 abuts against the brush 25 also has the most fluorescent powder. Therefore, the staff only needs to observe whether there is fluorescent powder on the inner wall of the spring 7 or the position with the most fluorescent powder is the position where the grease on the spring 7 is defective.

[0055] The initial position of the transport rack 29 is that the outermost end of the transport member 31 is close to the inner wall of the spring 7, which is to ensure that the brush 25 can be driven by the transport member 31 to the position in contact with the inner wall of the spring 7. When there is grease on the inside of the spring 7 that has not dried, in order to prevent the grease from dripping randomly and causing pollution to the environment, it is necessary to control the transport rack 29 to drive the transport rack 29 to move to the bottom of the corresponding position of the spring 7, that is, the transport member 31 is inserted between the spring coils of the spring 7, and the grease falls onto the transport member 31.

[0056] Embodiment 3

[0057] The present application embodiment discloses a production process of an electric push rod. Figure 1 , a production process of an electric linear actuator includes the following steps:

[0058] S1. Rivet the end of the screw, spray the screw with oil, and install the screw nut tube 5; 1) Manually install the three gaskets 49 into the screw outer shell 48 in sequence, put it into the fixture, position and clamp it; 2) Press the start button to automatically enter the riveting area, visually inspect whether the gasket 49 is missing, and if the inspection is qualified, the riveting is automatically completed; 3) The riveting mechanism returns to its original state, manually removes the riveting assembly, and puts it into the oil injection mechanism; 4) Press the start button, the servo slide drives the oil injection system to automatically complete, and the circumferential surface of the screw 4 is sprayed; 5) After the spraying is completed, the mechanism returns to its original state, and the screw is manually taken out and inserted into the screw nut tube 5; 6) After assembly, the semi-finished product is placed in the turnover tray of the next process.

[0059] S2, bushing press-fitting, bearing 8 press-fitting, and riveting bearing 8 retaining ring; 1) Manually install the sealing ring 6 into the bushing, and then pre-install the bushing assembly into the screw outer shell 48, put it into the fixture, clamp and position it; 2) Press the start button, the servo bushing press-fitting mechanism starts to automatically press the bushing into place, and the probe detects whether the sealing ring 6 is missing; a) Manually pre-install the bearing 8 into the screw outer shell 48; b) Press the start button again, the servo bearing press-fitting mechanism starts to automatically press the bearing 8 into place; c) After the bearing 8 is pressed, the tooling automatically moves to the gasket 49 pressing position; d) Manually install the gasket 49, press the start button again, and automatically complete the gasket 49 pressing; e) After the pressing is completed, the mechanism automatically returns to its original position; f) Manually take the parts and put them into the next station turnover tray;

[0060] S3, motor reducer assembly assembly, laser welding; 1) manually pre-install the previous process components and the motor reducer assembly into the motor end plastic housing 9; 2) manually place the pre-installed motor reducer assembly in the press-fit fixture; 3) press the button, the guide mechanism clamps, the servo press starts to press the motor reducer assembly into the motor end plastic housing 9, and the displacement and force value are monitored during pressing; 4) after the press-fitting is completed, take out the parts, and manually pre-install the motor end plastic housing ball socket assembly 10 into the motor end plastic housing 9; 5) manually put the motor 2 press-fit assembly into the welding and fix the wiring harness; 6) press the start button to automatically complete the welding; 7) after the welding is completed, the weld detection is automatically completed;

[0061] S4, spraying oil on the spring 7; clamp the two ends of the spring 7 with the clips 16, fix the two ends of the spring 7 with the two clips 16 respectively, and the spray head 14 faces the spring 7, and controls the spray head 14 to start spraying grease and reciprocating to achieve the effect of spraying grease on the spring 7. When the spraying of one spring 7 is completed, the rotating frame 15 is controlled to rotate and rotate the next spring 7 to the position of the spray head 14, and the next spring 7 is sprayed until the spraying of all springs 7 is completed;

[0062] S5, whether the grease inside and outside the spring 7 meets the standard; the light inspection mechanism performs light inspection on the inside of the spring 7. If it is found that the grease is not sprayed evenly on the inside of the spring 7, the corresponding position of the spring 7 is marked by the marking mechanism, and it needs to be re-sprayed or repaired later. If the spring 7 is not dried thoroughly and the grease is not dried, the quick-drying mechanism is required to dry the grease of the spring 7;

[0063] S6, assembly: press-fit the spring 7 and buckle the ball socket assembly 10; 1) manually pre-install the motor 2 fixed sleeve assembly, the gaskets 49 at both ends and the plane bearing, spring 7, and movable sleeve into the press-fit fixture; 2) manually put the ball socket assembly 10 into the servo profiling fixture; 3) press the double start button, the safety door closes, and the spring 7 is automatically compressed to a certain position; 4) automatically load the assembly 10 and complete the buckling and riveting; after the press-fitting is completed, the mechanism returns to its original state, the safety door opens, and the parts are manually removed.

[0064] S7, electric push rod performance test and laser marking; 1) Manually scan the code, put the electric push rod into the ball and socket assemblies 10 at both ends of the fixture, and plug in the connector; 2) Press the start button to tighten the ball and socket assemblies 10 at both ends; 3) The servo mechanism compresses and extends the test strut passive force at the set speed and generates a force curve; 4) Automatically turn on the power, and the servo system cooperates with the compression and extension of the strut to test the electrical performance of the strut; 5) After the test is completed, qualified parts are automatically marked with a mark and a QR code in the circumferential direction of the electric push rod (unqualified parts are not marked); 6) After the operation is completed, the mechanism returns to its original state and the parts are picked up manually.

[0065] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A production line for electric push rods, used for producing electric push rods, the electric push rods comprising a support tube plastic shell (1), a ball and socket assembly (10), a motor end plastic shell (9), a screw outer shell (48), a screw (4), a screw nut tube (5), a sealing ring (6) and a spring (7); the motor end plastic shell (9) is made of a light-transmitting material; two ball and socket assemblies (10) are arranged at both ends of the support tube plastic shell (1) and the motor end plastic shell (9); the motor end plastic shell (9 ) is installed with a motor reduction box assembly, the motor reduction box assembly comprising a motor (2) and a reduction box (3), the end of the screw rod (4) without a thread passes through the screw rod outer shell (48) and is connected to the output end of the reduction box (3), the screw rod outer shell (48) is rotatably connected to the screw rod (4) through a bearing (8), the sealing ring (6) is arranged in the plastic shell (9) at the motor end at a position where the screw rod (4) is not threaded, and between the screw rod outer shell (48) and the sealing ring (6) A sealing ring is also provided; the screw rod (4) is spirally matched with the screw rod nut tube (5); the screw rod nut tube (5) is fixedly connected to the inner wall of the support tube plastic shell (1); the spring (7) is sleeved on the inner wall of the motor end plastic shell (9) and the outer wall of the support tube plastic shell (1); the screw rod outer shell (48) is provided with a thrust bearing (50) at the position where the screw rod (4) passes through; the screw rod outer shell (48) is provided with a gasket on the back of the thrust bearing (50); the thrust bearing (50) is pressed against the end of the screw housing (48) by the spring (7); the output end of the reduction box (3) and the screw (4) are connected via a damper (11); the ball and socket assembly (10) at the end of the motor end plastic housing (9), the motor end plastic housing (9) and the screw housing (48) are integrally laser welded; a Hall plate (12) is installed at the upper end of the motor (2), and the Hall plate (12) is used to sense current changes to cut off or start the power supply of the motor (2) to complete the closing or opening action of the tailgate; Features: It includes screw processing system, press-fit bushing system, motor component assembly system, spring oil injection system, general assembly system and performance testing system in sequence; The spring (7) oil spraying system comprises a spraying device for spraying grease on the spring (7) and a detection device for detecting whether the spraying of the spring (7) is completed, the detection device comprises a bracket (17), a detection frame (18) lifted and arranged on the bracket (17), a detection rod (19) rotatably arranged on the detection frame (18), a light detection mechanism for illuminating the inner side of the spring (7) for detection, a marking mechanism for marking defects in the spraying of the spring (7), and a quick-drying mechanism for drying the grease-undried position of the spring (7); the detection rod (19) is inserted into the spring (7); The optical detection mechanism comprises a light source (20), a plane mirror (21) and a camera (22); a light detection cavity (23) is arranged in the detection rod (19); the light detection cavity (23) is arranged in an L shape; the horizontal section of the light detection cavity (23) is arranged as an opening; the camera (22) is fixed in the vertical section of the light detection cavity (23); the light source (20) is fixed at the upper end of the opening of the horizontal section of the light detection cavity (23); the light source (20) is directly opposite to the inner wall of the spring (7); the plane mirror (21) is fixed at the corner of the horizontal section and the vertical section in the light detection cavity (23); and the angle between the plane mirror (21) and the horizontal section or the vertical section of the light detection cavity (23) is 45°; The marking mechanism comprises a marking tank (24) filled with fluorescent powder, a brush (25), a transport component for transporting the brush (25), and a trigger component for controlling the movement of the transport component; the detection rod (19) is provided with a marking cavity (26) below the horizontal section of the optical inspection cavity (23); the marking tank (24) is arranged on the transport component; the brush (25) is moved by the transport component to abut against a position where a grease defect of the spring (7) occurs; the marking tank (24) is provided with a discharge port (27), and a solenoid valve (28) is installed on the discharge port (27).

2. The production line of an electric push rod according to claim 1, characterized in that: The transport assembly comprises a transport frame (29) slidably arranged in the marking chamber (26), two winding rollers (30) rotatably arranged on the transport frame (29), a transport member (31) sleeved on two transport members (31), and a control unit for controlling the rotation of any one of the winding rollers (30); the marking tank (24) is fixed on the transport frame (29); the brush (25) is fixed on the upper surface of the transport member (31) and the bristles on the brush (25) are directly facing the discharge port (27).

3. The production line of an electric push rod according to claim 2, characterized in that: The control part comprises a first electric push rod (32), a control rope (33), a rack (34) fixedly connected to the end of the control rope (33), a gear (35) meshingly connected to the rack (34), and a first fixed pulley (36); the detection rod (19) is provided with a control cavity (37) connected to the marking cavity (26); the first electric push rod (32) is fixed at the top end of the detection rod (19); the head end of the control rope (33) is fixedly connected to the output end of the first electric push rod (32); the first fixed pulley (36) is rotatably arranged in the marking cavity (26) and guides the position where the control rope (33) is connected to the rack (34) to be horizontal; the rack (34) is elastically arranged on the transport frame (29) and the gear (35) is rotatably arranged on the transport frame (29); the gear (35) is coaxially fixed with the corresponding winding roller (30).

4. The production line of an electric push rod according to claim 3, characterized in that: The trigger assembly comprises a second electric push rod (38), a trigger rope (39), a second fixed pulley (40) and an elastic member. The transport frame (29) and the marking cavity (26) are elastically arranged in the horizontal direction through the elastic member. The second electric push rod (38) is also fixed to the top end of the detection rod (19) and one end of the trigger rope (39) is fixedly connected to the output end of the second electric push rod (38). The second fixed pulley (40) is also arranged in the marking cavity (26). The end of the trigger rope (39) is fixedly connected to the transport frame (29) after passing around the second fixed pulley (40). The part of the trigger rope (39) after passing around the second fixed pulley (40) is also arranged horizontally.

5. The production line of an electric push rod according to claim 4, characterized in that: The quick-drying mechanism comprises an air supply component, an air duct (44) arranged above the optical inspection cavity (23), an air outlet (45) connected to the end of the air duct (44), and a swing component for controlling the swing of the air outlet (45), wherein the air supply component is arranged in an external environment, the air duct (44) passes through the detection rod (19), and the air outlet (45) is arranged obliquely and faces the position of the spring (7) corresponding to the optical inspection cavity (23).

6. A production process for an electric linear actuator, based on the production line of the electric linear actuator according to any one of claims 1 to 5, characterized in that: The steps include: The end of the screw is riveted, the screw is sprayed with oil, and the nut tube is installed; Bushing press-fitting, bearing (8) press-fitting, and riveting bearing (8) retaining ring; Motor (2) component assembly, laser welding; Spring (7) sprays oil; Check whether the grease inside and outside the spring (7) meets the standards; Assembly: press-fit the spring (7) and buckle the ball and socket assembly (10); Strut performance testing and laser marking.

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