A tensioning device for preventing a vehicle body from separating from a lifting device in a general assembly lifting station

Abstract

The utility model discloses a kind of for general assembly jacking station prevent car body from separating from the tensioning device of lifting appliance, to solve the problem of difficult to adapt to tensioning caused by the inconsistent hook height when mixed-line production of multiple varieties of car body. The device includes mounting plate, holds tight motor, gear transmission assembly, tensioning cylinder, cam clutch, chain and hook;Holds tight motor and gear transmission assembly transmission connection, gear transmission assembly and the input end of cam clutch are fixedly connected, the piston rod end of tensioning cylinder is connected with one end of chain, the other end of chain is fixedly connected with hook after passing through cam clutch, cam clutch is configured to only allow chain one-way transmission along tensioning direction.The utility model is through the combination structure of cylinder self-adapting tensioning and cam clutch one-way locking, realize the quick stable tensioning of multiple height hooks, compact structure and strong compatibility, effectively improve production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of passenger vehicle automation equipment, and in particular to a tensioning device for preventing the vehicle body from detaching from the lifting device at the final assembly lifting station. Background Technology

[0002] In the passenger vehicle final assembly workshop, the rear suspension lifting operation refers to the precise lifting of the rear of the vehicle, mainly the rear axle and surrounding area, to a set height using specialized equipment at a specific workstation. This facilitates the installation and adjustment of the suspension system and related components by the final assembly workers. This operation is a crucial step in the chassis assembly module of the final assembly process, directly affecting the vehicle's rear driving stability, comfort, and safety.

[0003] Vehicles are typically transported horizontally on the assembly line with low ground clearance, making it impossible to directly lift or tighten rear suspension components. Lifting the vehicle exposes the rear chassis, facilitating work by workers or automated equipment. The rear suspension components need precise alignment with the chassis mounting points, such as the rear longitudinal beam supports. The lifting equipment uses fixed support points, such as the lifting point at the rear of the vehicle, to ensure vehicle stability and prevent dimensional deviations caused by vehicle body shifting during assembly.

[0004] During the rear suspension lifting operation in the passenger vehicle assembly workshop, the vehicle body is transported to the work area via a lifting device. At this point, the vehicle body lacks effective vertical restraint in the Z-direction on the lifting device. To prevent the vehicle body from swaying and detaching from the lifting device during lifting operations, the hooks at the rear of the vehicle body need to be tightened and secured. However, in scenarios involving mixed production lines for various vehicle body models, the height of the rear hooks differs significantly between different models. Traditional tensioning devices are mostly designed for a fixed height, making them incompatible with hooks of different heights. This results in poor tensioning stability, time-consuming adjustments during model changes, and severely impacts production efficiency. Therefore, developing a tensioning device that can adapt to hooks of multiple heights is crucial to solving these problems. Summary of the Invention

[0005] To address the tensioning and compatibility issues caused by inconsistent heights of various car body hooks in existing technologies, this utility model provides a tensioning device for preventing car bodies from detaching from the lifting device at the final assembly lifting station. This device enables rapid and stable tensioning of hooks at multiple heights, improving equipment compatibility and production efficiency.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows: A tensioning device for preventing the vehicle body from detaching from a lifting device at a final assembly lifting position includes a mounting plate, a clamping motor and a tensioning cylinder mounted on the mounting plate; a gear transmission assembly includes a driving wheel, a driven wheel and a rack, the driving wheel and the driven wheel both meshing with the rack, the output shaft of the clamping motor is connected to the driving wheel of the gear transmission assembly, and the driven wheel of the gear transmission assembly is connected to the input end of a cam clutch; the piston rod end of the tensioning cylinder is connected to one end of a chain; the middle part of the chain passes around the outer peripheral transmission surface of the cam clutch, and the other end of the chain is connected to the tail of a hook; the cam clutch is configured to allow the chain to drive only in the direction of tensioning the vehicle body, and to lock when the chain is subjected to reverse tension.

[0007] Furthermore, the hook head is an arc-shaped hook groove, and the hook tail is provided with a vertical rod. The bottom of the arc-shaped hook groove is connected to one end of the chain, the other end of the chain is connected to the vertical rod, and the other end of the vertical rod passes through the support plate.

[0008] Furthermore, a spring reset assembly is connected to the bottom surface of the support plate.

[0009] Furthermore, the spring reset assembly includes a reset spring and a guide rod, with the guide rod serving as the mounting component for the reset spring, and the reset spring being disposed on the surface of the guide rod.

[0010] Furthermore, the top end of the reset spring is connected to the bottom surface of the support plate, and the bottom end of the guide rod is set on the top surface of the support rod. The top end of the guide rod passes through the support plate, and the guide rod and the support plate are in clearance fit. Under the action of the reset spring, the support plate can move back and forth along the guide rod.

[0011] Furthermore, the bottom end of the support rod is fixed to the mounting plate, and a protrusion with a through hole is provided on the side of the support rod facing the hook.

[0012] Furthermore, the protruding block is movably connected to the vertical rod, with one end of the vertical rod passing through the support plate and extending out from the through hole on the protruding block. The vertical rod and the protruding block are fitted with a clearance, and when there is an external force, the vertical rod can slide along the protruding block.

[0013] Furthermore, the bottom of the straight rod extending from the through hole on the protrusion is connected to one end of the chain.

[0014] Furthermore, the inner wall of the arc-shaped hook groove at the hook head is equipped with an anti-slip rubber pad.

[0015] Furthermore, the housing of the cam clutch is fixed to the clutch bracket on the mounting plate by bolts.

[0016] The beneficial effects of this utility model are as follows: 1. Strong compatibility: Through the adaptive tensioning of the tensioning cylinder and the one-way transmission design of the cam clutch, it can adapt to different height hooks of various car bodies without manual adjustment, solving the adaptation problem in mixed-line production.

[0017] 2. Stable and reliable tensioning: The cylinder enables rapid pre-tensioning, and the motor forms a double load-bearing guarantee through gear transmission and clutch locking, effectively preventing the vehicle body from detaching from the lifting device during jacking operations and improving operational safety.

[0018] 3. Compact and efficient structure: All components are integrated on the mounting base, resulting in a compact overall structure that fits the limited working space of the final assembly workshop. The process is highly automated, minimizing manual adjustment time and significantly improving production efficiency. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model. Figure 2 This is a schematic diagram of the connection between the chain and the cam clutch in an embodiment of this utility model.

[0020] Wherein: 1-Mounting plate 1, 2-Clamping motor, 3-Gear transmission assembly, 31-Driving gear, 32-Driven gear, 4-Tightening cylinder, 5-Cam clutch, 6-Chain, 7-Hook, 71-Arc-shaped hook groove, 8-Spring return assembly, 81-Return spring, 82-Guide rod, 9-Support plate, 10-Support frame, 101-Protrusion block. Detailed Implementation

[0021] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0022] This utility model discloses a tensioning device for preventing the vehicle body from detaching from the lifting device at the final assembly lifting position. The device uses a mounting plate 1 as its supporting base. The mounting plate 1 is made of welded steel plate and is used to fix the various functional components of the device. The core functional components of this utility model device include a clamping motor 2, a gear transmission assembly 3, a tensioning cylinder 4, a cam clutch 5, a chain 6, a hook 7, and a spring return assembly 8.

[0023] The clamping motor 2 is a servo motor, which is fixed to the motor mounting base on the mounting plate 1 by bolts. The motor output shaft extends in the horizontal direction, and the shaft end is fixedly connected to the drive gear 31 of the gear transmission assembly 3 by a flat key to realize power output.

[0024] The gear transmission assembly 3 includes a driving gear 31, a driven gear 32, and a rack. The driving gear 31 meshes with the rack, and the rack meshes with the driven gear. The hub of the driven gear 32 is fixedly connected to the input shaft of the cam clutch 5 via a flat key, transmitting power from the clamping motor 2 to the cam clutch 5.

[0025] The cam clutch 5 adopts an existing one-way overrunning clutch. The housing of the cam clutch 5 is fixed to the clutch bracket on the mounting plate 1 by bolts. The input shaft of the cam clutch 5 is connected to the driven gear 32. The outer peripheral surface of the cam clutch 5 is set as the transmission surface of the chain 6. The cam clutch 5 is configured to only allow the chain 6 to drive in the direction of tensioning the vehicle body, such as clockwise. When subjected to reverse force, the cam clutch 5 automatically locks. The internal structure of the existing one-way overrunning clutch includes an outer ring, an inner ring, a cam block, and a spring. The outer ring is fixed, while the inner ring rotates with the driven gear 32. The cam block engages with the locking teeth of the outer ring under the action of the spring to achieve the one-way locking function.

[0026] The tensioning cylinder 4 is a double-acting cylinder. The cylinder body is fixed to the cylinder bracket on the mounting plate 1 by a flange. The piston rod of the tensioning cylinder 4 extends toward the cam clutch 5. The end of the piston rod is hinged to one end of the chain 6 by a connecting pin, so as to ensure that the chain 6 can achieve tensioning and loosening actions as the piston rod extends and retracts.

[0027] The middle part of the chain 6 passes around the outer peripheral transmission surface of the cam clutch 5 to form a transmission engagement, and the other end of the chain 6 is fixed to the vertical rod 72 at the tail of the hook 7 by a fastening bolt.

[0028] The head of the hook 7 is machined with an arc-shaped hook groove 71 to fit the shape of the hook at the rear of the vehicle. The inner wall of the arc-shaped hook groove 71 can be attached with an anti-slip rubber pad to enhance the stability of the fit. The tail of the hook 7 is also provided with a vertical rod 72. The bottom of the arc-shaped hook groove 71 is connected to one end of the chain, and the other end of the chain is connected to one end of the vertical rod 72. The other end of the vertical rod 72 passes through the support plate 9, and the vertical rod 72 is fixedly connected to the support plate 9.

[0029] The spring reset assembly 8 includes a reset spring 81 and a guide rod 82. The guide rod 82 serves as the mounting component for the reset spring 81. The reset spring 81 is disposed on the surface of the guide rod 82, and the top end of the reset spring 81 is fixedly connected to the bottom surface of the support plate 9. The bottom end of the guide rod 82 is disposed on the top surface of the support rod 10, and the top end of the guide rod 82 passes through the support plate 9. The guide rod 82 and the support plate 9 are in clearance fit. Under the action of the reset spring 81, the support plate 9 can move back and forth along the guide rod 82.

[0030] The bottom end of the support rod 10 is fixed to the mounting plate 1. A protrusion 101 is provided on the side of the support rod 10 facing the hook 7. The protrusion 101 has a through hole. One end of the vertical rod 72 passes through the support plate 9 and extends out of the through hole in the protrusion 101. The vertical rod 72 is in clearance fit with the protrusion 101, allowing it to slide along the protrusion 101 under external force. The bottom end of the vertical rod 72 extends out of the through hole in the protrusion 101 and is connected to one end of the chain 6.

[0031] The workflow of this device revolves around the entire cycle of vehicle body lifting operations, specifically including the following steps: When the vehicle body is transported to the lifting position by the lifting device, the tensioning cylinder 4 is not working. The hook 7 and the support plate 9 are in the initial position under the support of the return spring 81. The operator attaches the arc-shaped hook groove 71 of this utility model device to the hook at the rear of the vehicle body according to the actual height of the hook at the rear of the vehicle body, thus completing the initial connection.

[0032] After the initial connection is completed, the tensioning cylinder 4 is activated. The cylinder piston rod pulls one end of the chain 6 to move, and the middle of the chain slides along the outer peripheral transmission surface of the cam clutch 5, thereby driving the hook 7 to move towards the mounting plate 1, thus tightening the hook at the rear of the vehicle. Since the hook heights of different vehicle bodies vary, the cylinder piston rod continues to work until the chain 6 is fully tensioned, that is, pulled until it can no longer be pulled. During this process, the cam clutch 5 allows the chain 6 to move freely in the tensioning direction without the need for the clamping motor 2 to intervene, achieving adaptive tensioning for hooks of different heights.

[0033] After tensioning is completed, the rear suspension lifting equipment is activated for lifting operations. Under the lifting force, the vehicle body tends to move upwards, and the hook 7 and chain 6 bear a reverse pulling force, i.e., a pulling force away from the mounting plate 1. At this time, the cam clutch 5 triggers its locking function due to the reverse force. The cam block included in the cam clutch 5 tightly meshes with the locking teeth of the outer ring of the cam clutch under the pulling force, preventing the chain 6 from sliding backwards. The force is transmitted from the tensioning cylinder 4 to the cam clutch 5, and then to the clamping motor 4 through the gear transmission assembly 3. The clamping motor 4 starts and outputs a constant torque, maintaining the locked state of the cam clutch 5 through the gear transmission assembly 3, achieving stable load-bearing on the vehicle body, preventing the vehicle body from detaching from the lifting device, and realizing the lifting operation.

[0034] After the lifting operation is completed, the rear suspension equipment is reset, and the weight of the vehicle body is once again supported by the lifting device. The reverse tension of the hook 7 and chain 6 disappears. The clamping motor 4 is started and controlled to rotate in reverse. The clamping motor 4 drives the inner ring of the cam clutch 5 to rotate in reverse through the gear transmission assembly 3. The cam block of the cam clutch compresses the spring of the cam clutch, and the cam block disengages from the outer ring locking teeth, releasing the locking state. At the same time, the tensioning cylinder 4 stops working. Under the elastic force of the return spring 81, the vertical rod 72 moves along the protrusion 101, causing the support plate 9 and the top of the vertical rod 72 to move away from the mounting plate 1. Under the elastic force of the return spring 81, the hook 7 and the support plate 9 return to their initial positions. The operator separates the hook 7 from the hook at the rear of the vehicle body, and the vehicle body leaves the lifting position with the lifting device, completing one operation cycle.

[0035] The following refers to Figure 1 and... Figure 2 The embodiments of this application will be described in detail below: The clamping motor 2 is fixed to the motor mounting base of the mounting base 1 by bolts. The output shaft of the clamping motor 2 is connected to the drive gear 31 by a flat key. The drive gear 31 and the driven gear 32 are fitted with racks. When the clamping motor 2 works, it drives the drive gear 31 to rotate, and the rotation of the drive gear 31 drives the driven gear to rotate.

[0036] The hub of the driven gear 32 is fixed to the input shaft of the cam clutch 5 via a flat key.

[0037] The cylinder body of the tensioning cylinder 4 is fixed to the cylinder bracket by flange bolts. The piston rod end of the tensioning cylinder 4 is hinged to one end of the chain 6 by a connecting pin. The middle part of the chain 6 passes around the outer periphery of the cam clutch 5, and the other end of the chain 6 is connected to the tail of the vertical rod 72 included in the hook 7 by an M8 fastening bolt.

[0038] The return spring 81 is a compression spring, and the return spring 81 is sleeved on the outer periphery of the guide rod 82.

[0039] The outer ring of the cam clutch is fixed to the clutch bracket by bolts. The inner ring of the cam clutch is connected to the driven gear 32. Three cam blocks are evenly distributed on the outer circumference of the inner ring of the cam clutch. A spring 54 is provided between each cam block and the inner ring to ensure that the cam block meshes with the locking teeth of the outer ring when subjected to reverse force.

[0040] In this invention, the clamping motor 2 and the tensioning cylinder 4 are controlled by a PLC. The working process of this embodiment is as follows: After the vehicle body enters the work station, the operator attaches hook 7 to the vehicle body hook; the tension cylinder 4 works, pulling the chain 6 to adaptively tension the vehicle body; during the lifting operation, the cam clutch 5 is locked, and the clamping motor 2 outputs torque to bear the load; after the operation is completed, the clamping motor 2 rotates in the opposite direction to unlock, the tension cylinder 4 stops working, and the spring reset assembly 8 drives the hook 7 to reset.

[0041] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A tensioning device for preventing the car body from detaching from the lifting device at the final assembly lifting position, comprising a mounting plate (1), characterized in that: It also includes a clamping motor (2) and a tensioning cylinder (4) mounted on the mounting plate (1); The gear transmission assembly (3) includes a driving wheel (31), a driven wheel (32) and a rack. The driving wheel (31) and the driven wheel (32) are both meshed with the rack. The output shaft of the clamping motor (2) is connected to the driving wheel (31) of the gear transmission assembly (3). The driven wheel (32) of the gear transmission assembly (3) is connected to the input end of the cam clutch (5). The piston rod end of the tensioning cylinder (4) is connected to one end of the chain (6). The middle part of the chain (6) passes around the outer peripheral transmission surface of the cam clutch (5), and the other end of the chain (6) is connected to the tail of the hook (7).

2. A tensioning device for preventing the car body from detaching from the lifting device at the final assembly lifting position according to claim 1, characterized in that: The head of the hook (7) is an arc-shaped hook groove (71), and the tail of the hook (7) is provided with a vertical rod (72). The bottom of the arc-shaped hook groove (71) is connected to one end of the chain, and the other end of the chain is connected to one end of the vertical rod (72). The other end of the vertical rod (72) passes through the support plate (9).

3. A tensioning device for preventing the car body from detaching from the lifting device at the final assembly lifting position according to claim 2, characterized in that: The bottom surface of the support plate (9) is connected to a spring reset assembly (8).

4. A tensioning device for preventing the car body from detaching from the lifting device at the final assembly lifting position according to claim 3, characterized in that: The spring reset assembly (8) includes a reset spring (81) and a guide rod (82). The guide rod (82) serves as the mounting component for the reset spring (81), and the reset spring (81) is disposed on the surface of the guide rod (82).

5. A tensioning device for preventing the car body from detaching from the lifting device at the final assembly lifting position according to claim 4, characterized in that: The top end of the reset spring (81) is connected to the bottom surface of the support plate (9). The bottom end of the guide rod (82) is set on the top surface of the support rod (10). The top end of the guide rod (82) passes through the support plate (9). The guide rod (82) and the support plate (9) are in clearance fit. Under the action of the reset spring (81), the support plate (9) can move back and forth along the guide rod (82).

6. A tensioning device for preventing the car body from detaching from the lifting device at the final assembly lifting position according to claim 5, characterized in that: The bottom end of the support rod (10) is fixed on the mounting plate (1). A protrusion (101) is provided on the side of the support rod (10) facing the hook (7), and the protrusion (101) is provided with a through hole.

7. A tensioning device for preventing the car body from detaching from the lifting device at the final assembly lifting position according to claim 6, characterized in that: The protruding block (101) is movably connected to the vertical rod (72). One end of the vertical rod (72) passes through the support plate (9) and extends out from the through hole on the protruding block (101). The vertical rod (72) and the protruding block (101) are in clearance fit. When there is an external force, the vertical rod (72) can slide along the protruding block (101).

8. A tensioning device for preventing the car body from detaching from the lifting device at the final assembly lifting position according to claim 7, characterized in that: The vertical rod (72) extends from the through hole on the protrusion (101) and is connected at the bottom of one end to the chain (6).

9. A tensioning device for preventing the car body from detaching from the lifting device at the final assembly lifting position according to claim 1, characterized in that: The inner wall of the arc-shaped hook groove at the head of the hook (7) is provided with an anti-slip rubber pad.

10. A tensioning device for preventing the car body from detaching from the lifting device at the final assembly lifting position according to claim 1, characterized in that: The housing of the cam clutch (5) is fixed to the clutch bracket on the mounting plate (1) by bolts.

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