Automatic assembling platform for constant-force spring supports and hangers and assembling method of automatic assembling platform

Abstract

The invention provides an automatic assembling platform for a constant-force spring support hanger and an assembling method of the automatic assembling platform, and relates to the technical field of support hanger assembling. The device comprises a storage table, a longitudinal moving table and an auxiliary spring assembling assembly, and the storage table is suitable for bearing a constant-force spring support hanger; the longitudinal moving table is arranged on one side of the storage table and can be close to or away from the storage table in the length direction of the main spring. The auxiliary spring assembling assembly is arranged on the longitudinal moving table and comprises a detecting unit and two adjusting units, the adjusting units correspond to the moving plates one to one, and each adjusting unit is in transmission connection with the corresponding moving plate and can drive the moving plate to be close to or away from the main spring. The detection unit can detect the elastic force of the auxiliary spring located between the movable plate and the main spring. According to the auxiliary spring press-fitting device, automatic press-fitting of the auxiliary spring can be achieved, the situation that installation workers are hurt due to the situations that the auxiliary spring is broken and fixing fails is avoided, and the assembly safety is improved.

Description

Technical Field

[0001] This application relates to the field of support and hanger assembly technology, and in particular to an automatic assembly platform and assembly method for constant force spring supports and hangers. Background Technology

[0002] A constant force spring support is a device used to support and fix piping systems. Designed based on the principle of torque balance, it uses a combination of lever mechanism and spring to maintain a balance between the load torque and the spring torque when the pipe shifts. Within the entire permissible load displacement range, the rate of change in the support force is extremely small (typically less than 5%), thus achieving a near-constant support force. Since existing constant force spring supports generally suspend and support pipes and equipment using the elastic force generated by one main spring and two auxiliary springs, different specifications of constant force spring supports need to be assembled according to the scale of the pipes and equipment.

[0003] Existing constant force spring support assembly equipment generally includes a fixed platform, a main spring telescopic cylinder, and a pair of auxiliary spring telescopic cylinders. The main spring telescopic cylinder is located on one side of the fixed platform, and the pair of auxiliary spring telescopic cylinders are positioned opposite each other on the fixed platform along the width direction of the main spring telescopic cylinder. The installer first fixes the constant force spring support to be assembled on the fixed platform and positions it in the middle of the two auxiliary spring telescopic cylinders. Then, the piston rods of the two auxiliary spring telescopic cylinders are driven away from each other, causing the two auxiliary springs inside the constant force spring support to move away from each other. Then, with the help of the pin and the main spring telescopic cylinder, the main spring is compressed and fixed between the two levers between the two auxiliary springs. Then, the piston rods of the two auxiliary spring telescopic cylinders are carefully driven closer to each other until both auxiliary springs abut against the levers between the auxiliary spring and the main spring, ensuring that the outward elastic force applied by the two auxiliary springs is equal. Finally, the outer shell of the constant force spring support is manually installed.

[0004] However, because the above assembly process requires the installer to reach around the main spring or auxiliary spring to perform installation and fixing operations while using the telescopic cylinder to compress or release the spring, the existing constant force spring support assembly equipment is prone to injuring the installer when the auxiliary spring breaks or the auxiliary spring or lever fails to fix, resulting in a high safety risk.

[0005] In view of this, there is a need to provide an automatic assembly platform and assembly method for constant force spring supports. Summary of the Invention

[0006] To address the high safety risks posed by existing constant force spring support assembly equipment, which can easily injure installation workers when auxiliary springs break or levers fail to hold in place, this application provides an automated assembly platform and assembly method for constant force spring supports.

[0007] In a first aspect, this application provides an automatic assembly platform for a constant force spring support, which adopts the following technical solution: it includes a platform, a longitudinal moving platform, and an auxiliary spring assembly assembly. The platform is adapted to support the constant force spring support. The constant force spring support includes a support shell, a main spring, a pair of levers, a pair of moving plates, and a pair of auxiliary springs. The main spring is located inside the support shell and between the two levers. The end of each lever away from the main spring is hinged to the inner wall of the support shell. The moving plate is provided between the side of each lever away from the main spring and the inner wall of the support shell. The auxiliary springs correspond one-to-one with the moving plates. Each moving plate is provided with a corresponding auxiliary spring between it and the adjacent lever. The longitudinal moving platform is located on one side of the storage platform and can move closer to or further away from the storage platform along the length direction of the main spring. The auxiliary spring assembly is located on the longitudinal moving platform and includes a detection unit and two adjustment units. Each adjustment unit corresponds to a moving plate. Each adjustment unit is connected to the corresponding moving plate and can drive the moving plate to move closer to or away from the main spring. When the moving plate moves closer to the main spring, the detection unit can detect the elastic force of the auxiliary spring located between the moving plate and the main spring.

[0008] By adopting the above technical solution, when assembling a constant force spring support, the installer can first compress and fix the main spring inside the support shell, then install levers, auxiliary springs, and moving plates on both sides of the main spring and relax the auxiliary springs. Next, fix the support shell to the platform, then move the longitudinal moving platform close to the platform and connect the adjustment unit to the corresponding moving plate. Then, control the two adjustment units to drive the two moving plates to synchronously approach the main spring to compress the auxiliary springs. Simultaneously, the detection unit checks whether the elastic force of the two auxiliary springs is equal. If the elastic force is unequal, the auxiliary springs can be replaced and the operation repeated. If the elastic force is equal, the two auxiliary springs are compressed to a predetermined length. Compared with the prior art, which requires installers to manually perform installation and fixing operations during spring compression or release, this automatic assembly platform for constant force spring supports can automatically press-fit the auxiliary springs, avoiding injuries to installers due to spring breakage or fixation failure, thus improving assembly safety.

[0009] Specifically, the longitudinal moving stage includes a longitudinal rail, a longitudinal stage, and a longitudinal cylinder. The longitudinal rail is arranged along the length direction of the main spring. The longitudinal stage is disposed on the longitudinal rail and can move closer to or away from the storage platform along the longitudinal rail. The auxiliary spring assembly is disposed on the longitudinal stage. The longitudinal cylinder is connected to the longitudinal stage and can drive the longitudinal stage to move along the longitudinal rail.

[0010] By adopting the above technical solution, the installation worker can drive the longitudinal platform to move along the longitudinal rail using the longitudinal cylinder, thereby allowing the auxiliary spring assembly to move closer to or further away from the platform, which facilitates the operation of the constant force spring support by the auxiliary spring assembly.

[0011] Specifically, the detection unit includes a mounting plate, a detection device, a controller, and a pair of connecting arms. The mounting plate is erected on the longitudinal moving platform, and two transverse waist-shaped holes are opened on the mounting plate along the length direction of the auxiliary spring. The transverse waist-shaped holes and the auxiliary springs correspond one-to-one with the connecting arms. Each connecting arm passes through the corresponding transverse waist-shaped hole and can slide along the transverse waist-shaped hole. One end of each connecting arm can extend through a through hole opened on the hanger housing into the interior of the hanger housing and abut against the end of the corresponding auxiliary spring near the main spring. The detection device can detect the force on the two connecting arms, and the detection device is electrically connected to the controller and can send the detection result to the controller. The controller is electrically connected to the adjustment unit and can control the adjustment unit to drive the two moving plates closer to or away from the main spring.

[0012] By adopting the above technical solution, when it is necessary to compress two auxiliary springs, the installer can first fix the hoisting shell on the platform, then move the longitudinal moving platform close to the platform and make each connecting arm pass through the through hole opened on the hoisting shell and abut against the end of the corresponding auxiliary spring near the main spring. Then, the controller is activated to control the two adjusting units to drive the two moving plates to move closer to the main spring by the same distance, so that each auxiliary spring is in a compressed state. Then, the controller will detect whether the magnitude of the force on the two connecting arms is equal through the detection unit. If the controller prompts the installer that the magnitude of the force on the two connecting arms is different, it means that the two auxiliary springs are defective products with different stiffness coefficients and need to be replaced. If the controller determines that the magnitude of the force on the two connecting arms is the same, it can control the two adjusting units to press the auxiliary spring normally, thereby realizing the detection and automatic pressing of the auxiliary springs.

[0013] Furthermore, the detection device includes an abutment wheel, a torque sensor, and a telescopic cylinder. A vertically shaped hole is formed on the side of the mounting plate near the platform. The shaft of the abutment wheel passes through the vertically shaped hole and is connected to the torque sensor. Both connecting arms abut against the wheel surface of the abutment wheel and are symmetrically arranged with the vertically shaped hole as the axis of symmetry. The torque sensor can detect the torque received by the abutment wheel. The telescopic cylinder is connected to the torque sensor. The controller is electrically connected to the telescopic cylinder and can control the telescopic cylinder to drive the torque sensor to move the abutment wheel along the vertically shaped hole, so that the two connecting arms move closer or further apart.

[0014] By adopting the above technical solution, when the controller controls the two adjusting units to drive the two moving plates to the same distance from the main spring, the installer can synchronously control the telescopic cylinder to drive the torque sensor to move the abutment wheel along the vertical oblong hole. This allows the two connecting arms to move the ends of the two auxiliary springs that are close to the main spring away from the main spring by a certain distance. This enables the two auxiliary springs to separate from the adjacent levers and be in an independent compression state. This prevents the auxiliary springs from being connected to the levers and main spring during compression, thus avoiding the situation where the main spring's fixation fails if the auxiliary springs are over-compressed. Furthermore, because the two connecting arms are connected to the abutment wheel... The wheel surfaces abut against each other and are symmetrically arranged with the vertical oblong hole as the axis of symmetry. If the elastic forces applied by the two auxiliary springs to the two connecting arms are not equal, the torque sensor connected to the rotating shaft of the abutting wheel will detect the static torque, thereby enabling the detection of the stiffness coefficient of the two auxiliary springs. When the elastic forces applied by the two auxiliary springs to the two connecting arms are equal, the controller can first control the two adjusting units to compress the two auxiliary springs to a state shorter than the predetermined length, and then control the telescopic cylinder to drive the torque sensor to move the abutting wheel along the vertical oblong hole so that the two connecting arms are closer to each other. This causes the length of the two auxiliary springs to increase slowly and finally reach the predetermined length when they abut against the corresponding lever, thereby enabling the pressing of the auxiliary springs.

[0015] Furthermore, the connecting arm includes a mounting rod, a limiting block, a torsion spring, and two opening and closing claws. One end of the mounting rod is connected to the limiting block, and the other end of the mounting rod passes through the corresponding transverse waist-shaped hole, approaches the shelf, and is provided with a mounting rod. The mounting rod is provided with a limiting protrusion. Both the limiting protrusion and the limiting block can abut against the mounting plate and restrict the mounting rod from moving along its own length. The constant force spring support also includes an abutment cover. A limiting hole is opened on the side of the moving plate near the main spring. A limiting rod is provided on one side of the abutment cover, and an abutment protrusion is provided on the other side of the abutment cover. The limiting rod is inserted into the limiting hole and can slide along the limiting hole. The auxiliary spring is located between the moving plate and the abutment cover. One end of each of the two opening and closing claws is hinged to the mounting rod. The torsion spring is located on the mounting rod and can drive the ends of the two opening and closing claws away from the mounting rod to move closer to each other. When the longitudinal moving platform approaches the shelf, the two opening and closing claws can pass through the through hole opened on the support shell and extend into the interior of the support shell, and engage with the corresponding abutment protrusion and abut against the side of the abutment cover facing the main spring.

[0016] By adopting the above technical solution, during the pre-assembly of the constant force spring support bracket, after the main spring is pre-pressed and fixed, when installing the two auxiliary springs, levers, abutment covers, and moving plates, the installer can move both moving plates to a position where both auxiliary springs are in a relaxed state and the two abutment covers are positioned to clamp the corresponding levers with the main spring. This ensures that the positions of the abutment protrusions on the two abutment covers are relatively determined, so that when the longitudinal moving platform approaches the shelf, the two opening and closing claws can pass through the through holes in the bracket housing and accurately engage with the corresponding abutment protrusions. The torsion springs enable a detachable connection between the connecting arms and the abutment protrusions, allowing the two connecting arms to automatically separate from the corresponding abutment protrusions when the longitudinal moving platform moves away from the shelf.

[0017] Furthermore, the connecting arm also includes an abutment ring, which is rotatably connected to the rod body of the mounting rod and located between the limiting protrusion and the limiting block, and the wheel surface of the abutment ring can abut against the wheel surface of the abutment wheel.

[0018] By adopting the above technical solution, the setting of the abutment ring can reduce the friction between the mounting rod and the abutment wheel, so as to make the contact between the mounting rod and the abutment wheel more stable.

[0019] Specifically, the adjustment unit includes a transverse slide rail, a transverse moving table, an adjustment motor, a rotating component, a transmission component, and a transverse cylinder. The constant force spring support also includes two adjustment bolts. Two rotating screw holes leading into the support housing are opened on the support housing along the length direction of the auxiliary spring. The rotating screw holes and the moving plate are one-to-one with the adjustment bolts. Each adjustment bolt is screwed to the corresponding rotating screw hole, and the screw end of each adjustment bolt passes through the corresponding rotating screw hole and is rotatably connected to the corresponding moving plate. The transverse slide rail is arranged along the length of the auxiliary spring on the longitudinal moving platform. The transverse moving platform is arranged on the transverse slide rail. The adjusting motor is arranged on the transverse moving platform and is connected to the rotating component via the transmission component. The rotating component has a rotating hole on the side near the hanger housing that matches the corresponding adjusting bolt. The transverse cylinder is connected to the transverse moving platform and can drive the transverse moving platform to move the adjusting motor, the transmission component, and the rotating component closer to or away from the corresponding adjusting bolt. When the rotating component is close to the adjusting bolt, the rotating component can be sleeved on the screw head of the adjusting bolt through the rotating hole and drive the adjusting bolt to rotate.

[0020] By adopting the above technical solution, the transverse cylinder of the adjustment unit can drive the transverse moving table to move on the transverse slide rail, so that the rotating part moves closer to or away from the adjustment bolt. When the rotating part moves closer to the adjustment bolt, it can be sleeved on the threaded head of the adjustment bolt. Then, when the adjustment motor drives the rotating part to rotate through the transmission component, it can drive the adjustment bolt to rotate, thereby achieving precise adjustment of the position of the moving plate.

[0021] Furthermore, the transmission component includes a transmission housing and a worm gear. The transmission housing is disposed on the transverse moving platform. One end of the rotating component away from the rotating hole is rotatably connected to the inner wall of the transmission housing. The other end of the rotating component is inserted into a through hole opened in the transmission housing, and a worm wheel is provided on the rotating component. One end of the worm gear is connected to the output shaft of the adjusting motor, and the other end of the worm gear passes through the through hole opened in the transmission housing and extends into the interior of the transmission housing and meshes with the worm wheel.

[0022] By adopting the above technical solution, the regulating motor can be connected to the rotating parts through a worm and a worm wheel.

[0023] Specifically, the shelf has countersunk holes that are adapted to the hanging frame shell.

[0024] By adopting the above technical solution, the countersunk hole setting can more stably fix the constant force spring support on the platform, preventing it from shaking or shifting during assembly and improving the stability of the assembly process.

[0025] The second aspect of this application provides an assembly method for a constant force spring support, which adopts the following technical solution: S1. First, compress and fix the main spring inside the lifting shell. Then, install levers, auxiliary springs, and moving plates on both sides of the main spring, and adjust the position of each moving plate so that each auxiliary spring is in a relaxed state. Next, fix the lifting shell on the platform. Then, move the longitudinal moving platform close to the platform and make each connecting arm pass through the through hole opened on the lifting shell and abut against the end of the corresponding auxiliary spring close to the main spring. Then, start the controller to control the two adjustment units to drive the two moving plates to approach the main spring by the same distance, and control the telescopic cylinder to drive the torque sensor to drive the abutment wheel to move along the vertical waist-shaped hole so that each auxiliary spring is in a compressed state. S2. If the reading of the torque sensor is not zero, replace the auxiliary spring and repeat S1. If the reading of the torque sensor is zero, execute S3. S3. First, start the controller to control the adjustment unit to drive the moving plate closer to the main spring, then control the telescopic cylinder to drive the abutting wheel to move along the vertical waist-shaped hole and bring the two connecting arms closer to each other until the auxiliary spring abuts against the end near the main spring and abuts against the lever and is compressed to a preset length. Then, move the longitudinal moving platform away from the platform and separate the auxiliary spring assembly from the constant force spring support bracket. Finally, remove the constant force spring support bracket from the platform.

[0026] By adopting the above technical solution, the assembly of constant force spring supports can be automated, avoiding close contact between the spring and related components during spring compression or release operations. This reduces the risk of worker injury due to auxiliary spring breakage, auxiliary spring or lever fixation failure, etc., and improves the safety of the assembly process. It can also accurately detect whether the elastic force of the two auxiliary springs is balanced, and can promptly identify and replace auxiliary springs with inconsistent stiffness coefficients, ensuring the assembly quality of constant force spring supports.

[0027] In summary, this application includes at least one of the following beneficial technical effects: 1. A device comprising a platform, a longitudinal moving platform, and an auxiliary spring assembly assembly. The platform is suitable for supporting a constant force spring support. The constant force spring support includes a support housing, a main spring, a pair of levers, a pair of moving plates, and a pair of auxiliary springs. The main spring is located inside the support housing and between the two levers. The end of each lever away from the main spring is hinged to the inner wall of the support housing. A moving plate is provided between the side of each lever away from the main spring and the inner wall of the support housing. Each auxiliary spring corresponds to one moving plate, and each moving plate has a corresponding auxiliary spring between it and an adjacent lever. The longitudinal moving platform is located on one side of the platform and can move closer to or away from the platform along the length of the main spring. The auxiliary spring assembly assembly is located on the longitudinal moving platform and includes a detection unit and two adjustment units. Each adjustment unit corresponds to one moving plate, and each adjustment unit is driven by the corresponding moving plate and can drive the moving plate closer to or away from the main spring. When the moving plate approaches the main spring, the detection unit can detect the auxiliary spring located between the moving plate and the main spring. The elastic force is designed so that when assembling a constant force spring support, the installer can first compress and fix the main spring inside the support shell, then install levers, auxiliary springs, and moving plates on both sides of the main spring and relax the auxiliary springs. Next, the support shell is fixed to the platform. Then, the longitudinal moving platform is moved close to the platform, and the adjusting unit is connected to the corresponding moving plate. The two adjusting units then drive the two moving plates to synchronously approach the main spring to compress the auxiliary springs. Simultaneously, the detection unit checks whether the elastic force of the two auxiliary springs is equal. If the elastic forces are unequal, the auxiliary springs can be replaced and the operation repeated. If the elastic forces are equal, the two auxiliary springs are compressed to a predetermined length. Compared to existing technologies that require manual installation and fixing during spring compression or release, this automatic assembly platform for constant force spring supports can automatically press-fit the auxiliary springs, avoiding injuries to installers due to spring breakage or fixation failure, thus improving assembly safety. 2. The detection device includes an abutment wheel, a torque sensor, and a telescopic cylinder. A vertically shaped oblong hole is formed on the side of the mounting plate closest to the platform. The abutment wheel's shaft passes through this hole and connects to the torque sensor. Both connecting arms abut against the wheel surface of the abutment wheel and are symmetrically arranged with the vertical oblong hole as the axis of symmetry. The torque sensor detects the torque on the abutment wheel. The telescopic cylinder is connected to the torque sensor. The controller is electrically connected to the telescopic cylinder and can control the telescopic cylinder to drive the torque sensor, causing the abutment wheel to move along the vertical oblong hole, thus moving the two connecting arms closer to or further away from each other. When the controller controls the two adjusting units to drive the two moving plates to approach the main spring by the same distance, the installer can synchronously control the telescopic cylinder to drive the torque sensor, causing the abutment wheel to move along the vertical oblong hole, so that the ends of the two auxiliary springs closest to the main spring move away from the main spring by a certain distance. This allows the two auxiliary springs to separate from the adjacent levers and be in an independent compressed state, thus enabling... During compression, the auxiliary springs do not engage with the levers and main springs, thus avoiding the situation where the main spring's fixation fails if the auxiliary springs are over-compressed. Since both connecting arms abut against the wheel surface and are symmetrically arranged with the vertical oblong hole as the axis of symmetry, if the elastic forces applied by the two auxiliary springs to the two connecting arms are unequal, the torque sensor connected to the shaft of the abutment wheel will detect the static torque, thereby enabling the detection of the stiffness coefficient of the two auxiliary springs. When the elastic forces applied by the two auxiliary springs to the two connecting arms are equal, the controller can first control the two adjusting units to compress the two auxiliary springs to a length shorter than the predetermined length, and then control the telescopic cylinder to drive the torque sensor to move the abutment wheel along the vertical oblong hole to bring the two connecting arms closer together. This causes the length of the two auxiliary springs to increase slowly and reach the predetermined length when they finally abut against the corresponding levers, thus enabling the press-fitting of the auxiliary springs. Attached Figure Description

[0028] Figure 1 This is a perspective view of an automatic assembly platform for a constant force spring support according to this application; Figure 2 This is a top view of an automated assembly platform for a constant force spring support according to this application; Figure 3 It is along Figure 2 A schematic cross-sectional view taken along the AA direction; Figure 4 It is along Figure 2 A schematic cross-sectional view taken along the BB direction; Figure 5 It is along Figure 4 A schematic cross-sectional view taken along the CC direction; Figure 6 yes Figure 5A schematic enlarged view of region D, showing the torsion spring.

[0029] Reference numerals: 1. Display platform; 2. Longitudinal moving platform; 21. Longitudinal rail; 22. Longitudinal stage; 23. Longitudinal cylinder; 3. Auxiliary spring assembly; 31. Detection unit; 311. Mounting plate; 312. Detection device; 3121. Abutment wheel; 3122. Torque sensor; 3123. Telescopic cylinder; 313. Connecting arm; 3131. Mounting rod; 3132. Limiting block; 3133. Torsion spring; 3134. Opening and closing claw; 3135. Abutment 32. Connecting ring; 321. Adjusting unit; 322. Transverse slide rail; 323. Transverse moving table; 324. Adjusting motor; 325. Rotating component; 326. Transmission component; 3251. Transmission housing; 3252. Worm gear; 327. Transverse cylinder; 4. Constant force spring support bracket; 41. Hanger housing; 42. Main spring; 421. Fixing pin; 422. Load-bearing rod; 43. Lever; 44. Moving plate; 45. Auxiliary spring; 46. Abutment cover; 47. Adjusting bolt. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-6 Further explanation: See Figure 1 , Figure 4 , Figure 5 and Figure 6An automatic assembly platform for a constant force spring support bracket is provided for assembling a constant force spring support bracket 4. The constant force spring support bracket 4 may include a bracket housing 41, a main spring 42, a pair of levers 43, a pair of movable plates 44, two abutment covers 46, a pair of auxiliary springs 45, and two adjusting bolts 47. The main spring 42 is located inside the bracket housing 41 and between the two levers 43. The end of each lever 43 away from the main spring 42 is hinged to the inner wall of the bracket housing 41. The main spring 42 also includes a load-bearing rod 422 and a fixing pin 421. A through hole is provided on the bracket housing 41 along the length of the main spring 42. The load-bearing rod 422 has a groove formed on its shaft that is connected to the two levers 43. Each lever 43 has a corresponding load-bearing protrusion. One end of the load-bearing rod 422, used for connection to the ceiling, roof, etc., extends through a corresponding through hole to one side of the hanger housing 41. The other end of the load-bearing rod 422, used for connection to pipes or other objects to be suspended, sequentially extends through the main spring 42 and the corresponding through hole to the other side of the hanger housing 41, with the main spring 42 abutting against the load-bearing protrusion and the inner wall of the hanger housing. A fixing waist-shaped hole is also provided on the hanger housing along the moving direction of the load-bearing rod 422. Fixing protrusions are formed on both sides of the fixing waist-shaped hole on the outer wall of the hanger housing, and each fixing protrusion has a row of fixing protrusions along the moving direction of the load-bearing rod 422. The support rod 422 has a fixed hole and a pin protrusion. This pin protrusion extends through the fixed waist-shaped hole to the outside of the lifting housing and has a connecting hole. This allows the installer to restrict the movement of the support rod 422 by passing the fixing pin 421 through the two fixing holes and the connecting hole, thereby keeping the main spring 42 in a compressed state. Each lever 43 has a movable plate 44 between its side away from the main spring 42 and the inner wall of the lifting housing 41. The auxiliary spring 45 corresponds to the movable plate 44 one by one. A sleeve is fixedly connected to the side of the movable plate 44 near the main spring 42. The sleeve has a limit hole on the side facing the corresponding abutment cover 46. The side of the abutment cover 46 has a... The limiting rod has an abutment protrusion on the other side of the abutment cover 46. The limiting rod is inserted into the limiting hole and can slide along the limiting hole. Each auxiliary spring 45 is located between a corresponding moving plate 44 and the abutment cover 46. Two rotating screw holes leading into the hanging frame housing 41 are opened along the length direction of the auxiliary spring 45. The rotating screw holes and the moving plate 44 are corresponding one-to-one with the adjusting bolts 47. Each adjusting bolt 47 is screwed to the corresponding rotating screw hole, and the screw end of each adjusting bolt 47 passes through the corresponding rotating screw hole and is rotatably connected to the corresponding moving plate 44. The adjusting bolt 47 can be a hexagonal bolt with a regular hexagonal cross-section.

[0031] See Figure 1 , Figure 2 and Figure 4The automatic assembly platform for the constant force spring support includes a platform 1, a longitudinal moving platform 2, and an auxiliary spring assembly assembly 3. The platform 1 has countersunk holes that fit the support housing 41, allowing the constant force spring support 4 to be more stably fixed on the platform 1, preventing it from shaking or shifting during assembly and improving the stability of the assembly process. The longitudinal moving platform 2 includes a longitudinal rail 21, a longitudinal platform 22, and a longitudinal cylinder 23. The longitudinal rail 21 is arranged along the length of the main spring 42 on its base. 2. The auxiliary spring assembly 3 is located on the longitudinal rail 21 and can move closer to or away from the platform 1 along the longitudinal rail 21. The longitudinal cylinder 23 is connected to the longitudinal platform 22 and can drive the longitudinal platform 22 to move along the longitudinal rail 21. The auxiliary spring assembly 3 is located on the longitudinal moving platform 2, so that the installer can drive the longitudinal platform 22 to move along the longitudinal rail 21 through the longitudinal cylinder 23, thereby allowing the auxiliary spring assembly 3 to move closer to or away from the platform 1, which facilitates the operation of the constant force spring support 4 by the auxiliary spring assembly 3.

[0032] See Figure 3 , Figure 4 and Figure 5 The auxiliary spring assembly 3 includes a detection unit 31 and two adjustment units 32. Each adjustment unit 32 corresponds to a movable plate 44. Each adjustment unit 32 includes a transverse slide rail 321, a transverse moving table 322, an adjustment motor 323, a rotating component 324, a transmission component 325, and a transverse cylinder 326. The transverse slide rail 321 is positioned on the longitudinal platform 22 along the length of the auxiliary spring 45. The transverse moving table 322 is positioned on the transverse slide rail 321. The transmission component 325 includes a transmission housing 3251 and a worm gear 3252. The transmission housing 3251 is positioned on the transverse moving table 322. One end of the rotating component 324, away from the rotation hole, is rotatably connected to the inner wall of the transmission housing 3251. The other end of the rotating component 324 is inserted into a through hole in the transmission housing 3251, and the rotating component 324 is equipped with a worm gear. The worm gear 3252... One end is connected to the output shaft of the regulating motor 323, and the other end of the worm gear 3252 extends through the through hole in the transmission housing 3251 and meshes with the worm wheel. The rotating part 324 has a rotating hole on the side near the hanger housing 41 that matches the corresponding adjusting bolt 47. The transverse cylinder 326 is connected to the transverse moving table 322 and can drive the transverse moving table 322 to move the regulating motor 323, the transmission housing 3251 and the rotating part 324 closer to or away from the corresponding adjusting bolt 47. When both rotating parts 324 are close to the adjusting bolt 47, the two transmission housings 3251 can clamp the hanging housing and allow each rotating part 324 to be sleeved on the thread head of the corresponding adjusting bolt 47 through the rotating hole, so that the regulating motor 323 can drive the corresponding adjusting bolt 47 to rotate.

[0033] See Figure 3 , Figure 4 , Figure 5 and Figure 6 The detection unit 31 includes a mounting plate 311, a detection device 312, a controller (not shown in the figure), and a pair of connecting arms 313. The mounting plate 311 is erected on the longitudinal moving stage 2, and two transverse waist-shaped holes are opened on the mounting plate 311 along the length direction of the auxiliary spring 45. The transverse waist-shaped holes and the auxiliary spring 45 correspond one-to-one with the connecting arms 313. Each connecting arm 313 includes a mounting rod 3131, a limiting block 3132, a torsion spring 3133, an abutment ring 3135, and two opening and closing claws 3134. One end of the mounting rod 3131 is connected to the limiting block 3132, and the other end of the mounting rod 3131 passes through the corresponding transverse waist-shaped hole and approaches the table 1. The mounting rod 3131 has a limiting protrusion on its body. 135 can be rotatably connected to the rod body of the mounting rod 3131 via a bearing and is located between the limiting protrusion and the limiting block 3132, so that both the abutment ring 3135 and the limiting block 3132 can abut against the mounting plate 311 and restrict the mounting rod 3131 from moving along its own length direction; one end of each of the two opening and closing claws 3134 is hinged to the mounting rod 3131, and the torsion spring 3133 is provided on the mounting rod 3131 and can drive the ends of the two opening and closing claws 3134 away from the mounting rod 3131 to move closer to each other. When the longitudinal platform 22 is close to the shelf 1, the two opening and closing claws 3134 can pass through the through hole opened on the hanger shell 41 and extend into the interior of the hanger shell 41, and engage with the corresponding abutment protrusion and abut against the side of the abutment cover 46 facing the main spring 42.

[0034] Specifically, during the pre-assembly of the constant force spring support bracket 4, after the main spring 42 is pre-pressed and fixed, when installing the two auxiliary springs 45, levers 43, abutment covers 46 and moving plates 44, the installer can move both moving plates 44 to positions where the two auxiliary springs 45 are in a relaxed state and the two abutment covers 46 are positioned to clamp the corresponding levers 43 with the main spring 42. This ensures that the positions of the abutment protrusions on the two abutment covers 46 are relatively fixed, so that when the longitudinal moving platform 2 approaches the shelf 1, the two opening and closing claws 3134 can pass through the through holes on the bracket housing 41 and accurately engage with the corresponding abutment protrusions. The torsion spring 3133 enables the detachable connection between the connecting arm 313 and the abutment protrusion, so that when the longitudinal moving platform 2 moves away from the shelf 1, the two connecting arms 313 can automatically separate from the corresponding abutment protrusions.

[0035] See Figure 3 , Figure 4 , Figure 5 and Figure 6The detection device 312 includes a telescopic cylinder 3123, a torque sensor 3122, and a disc-shaped abutment wheel 3121. A vertically shaped oblong hole is formed on the side of the mounting plate 311 near the platform 1. The shaft of the abutment wheel 3121 passes through the vertical oblong hole and connects to the torque sensor 3122. Two connecting arms 313 abut against the wheel surface of the abutment wheel 3121 and are symmetrically arranged with the vertical oblong hole as the axis of symmetry. The torque sensor 3122 can detect the torque received by the abutment wheel 3121. The cylinder body of the telescopic cylinder 3123 is located on the top of the mounting plate 311, and it telescopically extends... The piston rod of cylinder 3123 extends downward and is connected to torque sensor 3122. The controller is electrically connected to telescopic cylinder 3123 and can control the telescopic cylinder 3123 to drive torque sensor 3122 to drive abutment wheel 3121 to move along the vertical waist-shaped hole. The wheel surface of each abutment ring 3135 can abut against the lower half of the wheel surface of abutment wheel 3121, so that when telescopic cylinder 3123 drives torque sensor 3122 to move downward, the two connecting arms 313 move away from each other, and when telescopic cylinder 3123 drives torque sensor 3122 to move upward, the two connecting arms 313 can move closer to each other.

[0036] Specifically, the controller can be a PLC control system. The longitudinal cylinder 23, each transverse cylinder 326, the telescopic cylinder 3123, each adjusting motor 323, and the torque sensor 3122 are all electrically connected to the PLC control system. The PLC control system can be configured such that after the lifting shell is fixed on the platform 1, it first controls the two transverse cylinders 326 to enable the two transmission shells 3251 to clamp the lifting shell and enable each rotating component 324 to be sleeved on the screw head of the corresponding adjusting bolt 47 through the rotating hole. Then, it controls the two adjusting motors 323 to drive the two moving plates 44 to approach the main spring 42 by the same distance, and simultaneously controls the telescopic cylinder 3123 to drive the torque sensor 3122 to drive the abutment wheel 3121 to descend along the vertical oblong hole, so that the ends of the two connecting arms 313 driving the two auxiliary springs 45 near the main spring 42 are slightly away from the main spring 42 by a certain distance, thereby enabling the two auxiliary springs 45 to separate from the adjacent levers 43 and be in an independent compression state. This ensures that the auxiliary springs 45 do not engage with the lever 43 and main spring 42 during compression, thus preventing the main spring 42 from failing to hold if the auxiliary springs 45 are overcompressed. Since the abutment rings 3135 on both connecting arms 313 abut against the wheel surface of the abutment wheel 3121 and are symmetrically arranged with the vertical waist-shaped hole as the axis of symmetry, if the elastic force applied by the two auxiliary springs 45 to the two connecting arms 313 is unequal, the torque sensor 3122 connected to the shaft of the abutment wheel 3121 will detect static torque. If static torque exists, it indicates that the elastic force of the two auxiliary springs 45 is unequal, and they are defective due to inconsistent spring coefficients. The controller will simultaneously alert the installer via devices such as a buzzer and display, and reverse the above operation to return both auxiliary springs 45 to a relaxed state, facilitating replacement of the auxiliary springs 45 by the installer. If there is no static torque, the controller will first control the two adjustment units 32 to compress the two auxiliary springs 45 to a state slightly shorter than the predetermined length, and then control the telescopic cylinder 3123 to drive the torque sensor 3122 to drive the abutment wheel 3121 to rise along the vertical waist-shaped hole so that the two connecting arms 313 move closer to each other. Then the length of the two auxiliary springs 45 will slowly increase and reach the predetermined length when they finally abut against the corresponding lever 43, thereby enabling the press-fitting of the auxiliary springs 45.

[0037] It should be noted that the predetermined length to which the auxiliary spring 45 is compressed can be calculated by combining the weight of the object to be lifted by the constant force spring support 4 with the stiffness coefficients of the auxiliary spring 45, the main spring 42, and the length of the lever arm 43, which will not be elaborated here. Since when one end of the object to be lifted by the constant force spring support 4 has a heavy object and the other end is suspended (such as a pipe connected to heavy equipment such as valves or pumps at one end, with the other end suspended), there will be a permanent off-center load at the connection between the constant force spring support 4 and the object. In this case, it is necessary to adjust the pre-compressed length of the two auxiliary springs 45 during the assembly of the constant force spring support 4 to make the two auxiliary springs 45 outward. The different output spring forces balance this permanent off-center load. The settings of torque sensor 3122 and controller can also automatically adjust the spring force difference between the two auxiliary springs 45. After the controller detects and determines that the spring coefficients of the two auxiliary springs 45 are consistent, it moves one moving plate 44 away from the main spring 42 and the other moving plate 44 closer to the main spring 42. At the same time, it calculates the spring force difference between the two auxiliary springs 45 and balances the permanent off-center load of the object to be lifted by combining the values ​​of torque sensor 3122, the length of piston rod movement driven by telescopic cylinder 3123, and the diameter of abutment wheel 3121 pre-input into the controller.

[0038] The implementation principle of the automatic assembly platform for constant force spring supports in this application is as follows: When assembling the constant force spring support bracket 4, the installer can first install the main spring 42, load-bearing rod 422, fixing pin 421, a pair of levers 43, a pair of moving plates 44, two abutment covers 46, a pair of auxiliary springs 45, and two adjusting bolts 47 into the bracket housing 41. Then, compress the main spring 42 individually and use the fixing pin 421 to keep the main spring 42 in a compressed state. Next, fix the bracket housing 41 to the platform 1. Then, move the longitudinal moving platform 2 close to the platform 1 and make each connecting arm 313 pass through the through hole opened on the bracket housing 41 and abut against the end of the corresponding auxiliary spring 45 near the main spring 42. Then, start the controller to control the two adjusting units 32 to drive the two moving plates 44 to move close to the main spring 42 by the same distance, so that each auxiliary spring 45 is in a compressed state. Then, the controller will detect through the detection unit 31. The controller measures whether the forces acting on the two connecting arms 313 are equal. If the controller indicates to the installer that the forces acting on the two connecting arms 313 are different, it means that the two auxiliary springs 45 are defective products with different stiffness coefficients and need to be replaced. If the controller determines that the forces acting on the two connecting arms 313 are equal, it can control the two adjusting units 32 to press the auxiliary springs 45 normally, thereby realizing the detection and automatic pressing of the auxiliary springs 45. Compared with the existing technology, which requires installers to manually install and fix the springs during compression or release, this automatic assembly platform for constant force spring supports can realize the automatic pressing of the auxiliary springs 45, avoiding the situation where installers are injured due to the breakage of the auxiliary springs 45 or failure of fixation, and improving the safety of assembly.

[0039] Based on the structure of the aforementioned automatic assembly platform for a constant force spring support, a second aspect of this application also provides an assembly method for a constant force spring support. This method utilizes the aforementioned automatic assembly platform for a constant force spring support, and specifically includes: S1. First, compress and fix the main spring 42 inside the lifting shell. Then, install levers 43, auxiliary springs 45 and moving plates 44 on both sides of the main spring 42, and adjust the position of each moving plate 44 so that each auxiliary spring 45 is in a relaxed state. Next, fix the lifting shell on the platform 1. Then, move the longitudinal moving platform 2 close to the platform 1 and make each connecting arm 313 pass through the through hole opened on the lifting shell 41 and abut against the end of the corresponding auxiliary spring 45 close to the main spring 42. Then, start the controller to control the two adjustment units 32 to drive the two moving plates 44 to approach the main spring 42 by the same distance, and control the telescopic cylinder 3123 to drive the torque sensor 3122 to drive the abutment wheel 3121 to move along the vertical waist-shaped hole so that each auxiliary spring 45 is in a compressed state. S2. If the reading of torque sensor 3122 is not zero, replace auxiliary spring 45 and repeat S1. If the reading of torque sensor 3122 is zero, execute S3. S3. First, start the controller to control the adjustment unit 32 to drive the moving plate 44 closer to the main spring 42. Then, control the telescopic cylinder 3123 to drive the abutment wheel 3121 to move along the vertical waist-shaped hole and make the two connecting arms 313 move closer to each other until the auxiliary spring 45 abuts against the end of the main spring 42 and the lever 43 and is compressed to the preset length. Then, move the longitudinal moving platform 2 away from the platform 1 and separate the auxiliary spring assembly 3 from the constant force spring support 4. Finally, remove the constant force spring support 4 from the platform 1.

[0040] Since the assembly method for a constant force spring support in this application is implemented using the aforementioned automatic assembly platform for a constant force spring support, it also possesses all the technical effects of the aforementioned automatic assembly platform for a constant force spring support. In particular, it can achieve automated assembly of the constant force spring support 4, avoiding close contact between the spring and related components during spring compression or release operations, reducing the risk of worker injury due to auxiliary spring 45 breakage, auxiliary spring 45 or lever 43 fixing failure, etc., and improving the safety of the assembly process; it can also accurately detect whether the elastic force of the two auxiliary springs 45 is balanced, and can promptly identify and replace auxiliary springs 45 with inconsistent spring coefficients, ensuring the assembly quality of the constant force spring support 4.

[0041] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. An automatic assembly platform for constant force spring supports, characterized in that: The assembly includes a platform (1), a longitudinal moving platform (2), and an auxiliary spring assembly (3). The platform (1) is adapted to support the constant force spring support (4). The constant force spring support (4) includes a support shell (41), a main spring (42), a pair of levers (43), a pair of moving plates (44), and a pair of auxiliary springs (45). The main spring (42) is located inside the support shell (41) and between the two levers (43). The end of each lever (43) away from the main spring (42) is hinged to the inner wall of the support shell (41). The moving plate (44) is provided between the side of each lever (43) away from the main spring (42) and the inner wall of the support shell (41). The auxiliary springs (45) correspond one-to-one with the moving plates (44). Each moving plate (44) is provided with a corresponding auxiliary spring (45) between it and the adjacent lever (43). The longitudinal moving platform (2) is located on one side of the platform (1) and can move closer to or further away from the platform (1) along the length direction of the main spring (42); The auxiliary spring assembly (3) is mounted on the longitudinal moving stage (2) and includes a detection unit (31) and two adjustment units (32). The adjustment units (32) correspond one-to-one with the moving plate (44). Each adjustment unit (32) is connected to the corresponding moving plate (44) and can drive the moving plate (44) to move closer to or away from the main spring (42). When the moving plate (44) moves closer to the main spring (42), the detection unit (31) can detect the elastic force of the auxiliary spring (45) located between the moving plate (44) and the main spring (42).

2. The automatic assembly platform for a constant force spring support according to claim 1, characterized in that: The longitudinal moving platform (2) includes a longitudinal rail (21), a longitudinal platform (22), and a longitudinal cylinder (23). The longitudinal rail (21) is arranged along the length direction of the main spring (42). The longitudinal platform (22) is arranged on the longitudinal rail (21) and can move closer to or further away from the storage platform (1) along the longitudinal rail (21). The auxiliary spring assembly (3) is arranged on the longitudinal platform (22). The longitudinal cylinder (23) is connected to the longitudinal platform (22) and can drive the longitudinal platform (22) to move along the longitudinal rail (21).

3. An automatic assembly platform for a constant force spring support according to claim 1, characterized in that: The detection unit (31) includes a mounting plate (311), a detection device (312), a controller, and a pair of connecting arms (313). The mounting plate (311) is erected on the longitudinal moving stage (2), and two transverse waist-shaped holes are opened on the mounting plate (311) along the length direction of the auxiliary spring (45). The transverse waist-shaped holes and the auxiliary spring (45) correspond one-to-one with the connecting arms (313). Each connecting arm (313) passes through the corresponding transverse waist-shaped hole and can slide along the transverse waist-shaped hole. One end can extend through the through hole opened on the hanger housing (41) into the interior of the hanger housing (41) and abut against the end of the corresponding auxiliary spring (45) near the main spring (42). The detection device (312) can detect the force on the two connecting arms (313), and the detection device (312) is electrically connected to the controller and can send the detection result to the controller. The controller is electrically connected to the adjustment unit (32) and can control the adjustment unit (32) to drive the two moving plates (44) to move closer to or away from the main spring (42).

4. An automatic assembly platform for a constant force spring support according to claim 3, characterized in that: The detection device (312) includes an abutment wheel (3121), a torque sensor (3122), and a telescopic cylinder (3123). A vertically shaped hole is formed on the side of the mounting plate (311) near the platform (1). The shaft of the abutment wheel (3121) passes through the vertically shaped hole and connects to the torque sensor (3122). Both connecting arms (313) abut against the wheel surface of the abutment wheel (3121) and use the vertically shaped hole as a reference. The two connecting arms (313) are arranged symmetrically on the axis. The torque sensor (3122) can detect the torque on the abutment wheel (3121). The telescopic cylinder (3123) is connected to the torque sensor (3122). The controller is electrically connected to the telescopic cylinder (3123) and can control the telescopic cylinder (3123) to drive the torque sensor (3122) to move the abutment wheel (3121) along the vertical waist-shaped hole so that the two connecting arms (313) move closer or further apart from each other.

5. An automatic assembly platform for a constant force spring support according to claim 4, characterized in that: The connecting arm (313) includes a mounting rod (3131), a limiting block (3132), a torsion spring (3133), and two opening and closing claws (3134). One end of the mounting rod (3131) is connected to the limiting block (3132), and the other end of the mounting rod (3131) passes through the corresponding transverse waist-shaped hole and approaches the shelf (1) and is provided with a mounting rod (3131). The mounting rod (3131) has a limiting protrusion on its body. The limiting protrusion and the limiting block (3132) can both abut against the mounting plate (311) and restrict the mounting rod (3131) from moving along its own length. The constant force spring support (4) also includes an abutment cover (46). The movable plate (44) has a limiting hole on one side near the main spring (42). A limiting rod is provided on one side of the abutment cover (46), and an abutment protrusion is provided on the other side of the abutment cover (46). The limiting rod is inserted into the limiting hole and can slide along the limiting hole. The auxiliary spring (45) is located between the movable plate (44) and the abutment cover (46). One end of each of the two opening and closing claws (3134) is hinged to the mounting rod (3131). On the mounting rod (3131), the torsion spring (3133) is provided on the mounting rod (3131) and can drive the two opening and closing claws (3134) away from the mounting rod (3131) to approach each other. When the longitudinal moving platform (2) approaches the shelf (1), the two opening and closing claws (3134) can pass through the through hole opened on the hanger shell (41) and extend into the interior of the hanger shell (41), and engage with the corresponding abutting protrusion and abut against the side of the abutting cover (46) facing the main spring (42).

6. An automatic assembly platform for a constant force spring support according to claim 5, characterized in that: The connecting arm (313) further includes an abutment ring (3135), which is rotatably connected to the rod body of the mounting rod (3131) and located between the limiting protrusion and the limiting block (3132), and the wheel surface of the abutment ring (3135) can abut against the wheel surface of the abutment wheel (3121).

7. An automatic assembly platform for a constant force spring support according to claim 1, characterized in that: The adjustment unit (32) includes a transverse slide rail (321), a transverse moving table (322), an adjustment motor (323), a rotating component (324), a transmission component (325), and a transverse cylinder (326). The constant force spring support bracket (4) also includes two adjustment bolts (47). Two rotating screw holes leading into the bracket housing (41) are opened along the length direction of the auxiliary spring (45). The rotating screw holes and the moving plate (44) correspond one-to-one with the adjustment bolts (47). Each adjustment bolt (47) is screwed to the corresponding rotating screw hole, and the screw end of each adjustment bolt (47) passes through the corresponding rotating screw hole and is rotatably connected to the corresponding moving plate (44). The transverse slide rail (321) is arranged on the longitudinal moving platform (2) along the length direction of the auxiliary spring (45). The transverse moving platform (322) is arranged on the transverse slide rail (321). The adjusting motor (323) is arranged on the transverse moving platform (322) and is connected to the rotating component (324) via the transmission component (325). The rotating component (324) has a rotating hole on the side near the hanger housing (41) that matches the corresponding adjusting bolt (47). The transverse cylinder (326) is connected to the transverse moving table (322) and can drive the transverse moving table (322) to move the adjusting motor (323), the transmission component (325) and the rotating component (324) closer to or away from the corresponding adjusting bolt (47). When the rotating component (324) is close to the adjusting bolt (47), the rotating component (324) can be sleeved on the screw head of the adjusting bolt (47) through the rotating hole and drive the adjusting bolt (47) to rotate.

8. An automatic assembly platform for a constant force spring support according to claim 7, characterized in that: The transmission component (325) includes a transmission housing (3251) and a worm gear (3252). The transmission housing (3251) is disposed on the transverse moving platform (322). One end of the rotating component (324) away from the rotating hole is rotatably connected to the inner wall of the transmission housing (3251). The other end of the rotating component (324) is inserted into a through hole opened on the transmission housing (3251), and a worm wheel is provided on the rotating component (324). One end of the worm gear (3252) is connected to the output shaft of the adjusting motor (323), and the other end of the worm gear (3252) passes through the through hole opened on the transmission housing (3251) and extends into the interior of the transmission housing (3251) and meshes with the worm wheel.

9. An automatic assembly platform for a constant force spring support according to claim 1, characterized in that: The platform (1) has a countersunk hole that matches the hanging frame shell (41).

10. An assembly method for a constant force spring support, implemented using the automatic assembly platform for a constant force spring support as described in claim 4, characterized in that, include: S1. First, compress and fix the main spring (42) inside the hoisting shell. Then, install levers (43), auxiliary springs (45), and moving plates (44) on both sides of the main spring (42). Adjust the position of each moving plate (44) so ​​that each auxiliary spring (45) is in a relaxed state. Next, fix the hoisting shell on the platform (1). Then, move the longitudinal moving platform (2) close to the platform (1) and make each connecting arm (313) pass through the through hole opened on the hoisting shell (41) and abut against the end of the corresponding auxiliary spring (45) close to the main spring (42). Then, start the controller to control the two adjustment units (32) to drive the two moving plates (44) to approach the main spring (42) by the same distance, and control the telescopic cylinder (3123) to drive the torque sensor (3122) to drive the abutment wheel (3121) to move along the vertical waist-shaped hole so that each auxiliary spring (45) is in a compressed state. S2. If the reading of the torque sensor (3122) is not zero, replace the auxiliary spring (45) and repeat S1. If the reading of the torque sensor (3122) is zero, execute S3. S3. First, start the controller to control the adjustment unit (32) to drive the moving plate (44) close to the main spring (42), then control the telescopic cylinder (3123) to drive the abutting wheel (3121) to move along the vertical waist-shaped hole and make the two connecting arms (313) close to each other until the auxiliary spring (45) abuts against the end close to the main spring (42) and the lever (43) and is compressed to a preset length. Then move the longitudinal moving platform (2) away from the platform (1) and separate the auxiliary spring assembly (3) from the constant force spring support (4). Finally, remove the constant force spring support (4) from the platform (1).

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