A car rear cover adjustment clamp

Abstract

This utility model relates to the field of automotive assembly technology, and more specifically, to an automotive rear cover adjustment fixture, comprising a fixture body, pneumatic clamping devices mounted at both ends of the fixture body, a distributor on the fixture body, the main air port of the distributor being connected to an external air source through a first air pipe, the distributor having at least two air distribution ports, and the pneumatic clamping devices being connected to the air distribution ports through a second air pipe. This utility model can solve the problem of accuracy deviation caused by fluctuations in the clamping force of the fixture on the car body, while reducing the workload of operators and ensuring the comfort and reliability of the fit of the body-in-white parts.

Description

Technical Field

[0001] This utility model relates to the field of automotive assembly technology, and more specifically, to an automotive rear cover adjustment clamp. Background Technology

[0002] Body adjustment is a core process for achieving high-precision fit between body-in-white components and is widely used in automotive welding workshops. However, in actual installation, defects such as step differences and gaps frequently occur, leading not only to significant waste of time and a surge in the workload of operators, but also to inefficiencies such as repeated adjustments. If the step difference between the rear cover and the trunk, side panels, etc., exceeds 0.5mm, it will significantly affect the smoothness of the body lines and reduce the appearance quality. At the same time, poor step differences can also cause uneven compression of the sealing strips, allowing rainwater and dust to easily seep into the trunk, causing problems such as water accumulation in the spare tire compartment and moisture damage to electronic equipment. In addition, at high speeds, the uneven surfaces created by step differences will disrupt the body's streamlined shape, increasing wind noise by about 3-5 decibels and fuel consumption by 2%-3%.

[0003] Currently, there are generally two methods for adjusting the rear cover of a vehicle: one is manual adjustment, which involves the worker visually inspecting and adjusting it by hand; the other is using a fixed structure clamp, which involves the worker installing a clamp and manually fixing it using a structural device.

[0004] However, both approaches have certain drawbacks. The first approach relies entirely on the operator's feel and experience, making it difficult to achieve high precision and standardize the process. This can lead to uneven gaps, and the entire adjustment process requires repeated adjustments, consuming a significant amount of time. The second approach fails to standardize the process; differences in operator technique and judgment make it difficult to guarantee consistent gaps after adjustment. Prolonged repetitive operation can easily lead to operator fatigue, affecting adjustment quality. Furthermore, the adjustment effect is heavily influenced by subjective factors; the operator's state of mind, emotions, and other subjective factors can interfere with the adjustment results.

[0005] The second approach uses a pre-designed fixed-structure fixture. The operator installs the fixture in a designated position and manually releases the clamping blocks to secure the workpiece using a mechanical structure. The fixture mainly consists of a base and clamping arms, using the clamping force of the clamping blocks to hold the workpiece. However, the clamping force is entirely dependent on the operator's hand strength. While the structural fixture provides mechanical support, human error still exists in the manual clamping process. After continuous operation, the operator's hand strength diminishes, directly leading to a decrease in clamping force. This makes the fixture prone to loosening on the machine body, causing some degree of shaking or even movement during assembly, thus affecting the consistency of installation accuracy. Utility Model Content

[0006] To address the technical problem of precision deviations in existing clamps, this invention provides an automotive rear cover adjustment clamp that solves the problem of precision deviations caused by fluctuations in the clamping force on the vehicle body. It also reduces the workload of operators and ensures the comfort and reliability of the fit between body-in-white components.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a car rear cover adjustment clamp, including a clamp body, pneumatic clamping devices are respectively installed at both ends of the clamp body, a distributor is provided on the clamp body, the main air hole of the distributor is connected to an external air source through a first air pipe, the distributor has at least two air distribution holes, and the pneumatic clamping device is connected to the air distribution holes through a second air pipe.

[0008] In this technical solution, the fixture body is used to maintain the basic shape of the fixture and to install and fix various parts. A pneumatic clamping device is mounted on the fixture body. This device clamps the sheet metal on the car body-in-white, generating friction with the sheet metal surface to fix the device to the body, thus securing the fixture body to the car body. The fixture body also has parts for engaging with the rear cover to determine its position. The pneumatic clamping device uses gas as power to clamp the car body-in-white. The clamping force is determined by the air pressure of the gas driving it. Therefore, to ensure the clamping force remains stable, a stable air source is sufficient. The clamping process is automated, eliminating the need for manual clamping and preventing a decrease in clamping force due to weakened hand strength. At least two pneumatic clamping devices are provided, installed at both ends of the fixture body, allowing the two ends to be fixed to the car body, achieving two-point fixation. The pneumatic device is also equipped with a distributor, which can evenly distribute the airflow as needed. The external air source enters the distributor through the first air pipe, and the distributor evenly distributes the gas to different air outlets. Finally, the gas enters the pneumatic clamping device through the second air pipe connected to the air distribution hole, driving the clamping device to work. This configuration ensures that the pneumatic clamping devices located at both ends of the fixture body can work simultaneously and synchronously without any time difference. It also ensures that the air pressure received by the two pneumatic clamping devices is the same, so that the clamping force of the two pneumatic clamping devices is the same, achieving constant control of the workpiece clamping force.

[0009] Preferably, the pneumatic clamping device includes a cylinder, a first clamping arm, a second clamping arm, a first clamping block, and a second clamping block. The cylinder and one end of the first clamping arm are fixedly mounted on the clamp body. The first clamping block is mounted on the other end of the first clamping arm. One end of the second clamping arm is connected to the driving end of the cylinder. The second clamping block is mounted on the other end of the second clamping arm. The shapes of the first clamping block and the second clamping block match the shape of the vehicle body. The cylinder is connected to the air distribution hole through a second air pipe.

[0010] Preferably, the first clamping block is detachably connected to the first clamping arm, and the second clamping block is detachably connected to the second clamping arm.

[0011] Preferably, a flow control valve is also provided on the second air pipe.

[0012] Preferably, the clamp body is further provided with a positioning device for determining the position of the back cover.

[0013] Preferably, the positioning device includes an outer cylinder, a sliding hole is provided inside the outer cylinder, a positioning pin is slidably installed in the sliding hole, and a driving device is provided on the end of the outer cylinder away from the rear cover to drive the positioning pin to extend out of the sliding hole.

[0014] Preferably, the driving device is a handle, the outer cylinder is provided with a hinge seat, the handle is hinged to the hinge seat, the handle is connected to the positioning pin through a connecting rod, and the hinge seat is provided with a locking mechanism for locking the handle.

[0015] Preferably, at least two positioning devices are provided, and the positioning pins in the two positioning devices are a diamond-shaped pin and a round pin, respectively.

[0016] Preferably, the fixture body is further provided with a second positioning pin, which is inserted into the vehicle body process hole, and the fixture body is further provided with a positioning block, which abuts against the surface of the vehicle body.

[0017] Preferably, the clamp body is provided with a handle, and there are two handles arranged left and right.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model is equipped with a pneumatic clamping device, which only requires ensuring a stable external air source to output a stable clamping force without fluctuations, ensuring secure clamping during use, guaranteeing the positional accuracy of the fixture body during assembly, and automating the clamping process, thus reducing the workload of workers. Pneumatic clamping devices are respectively installed at both ends of the fixture body, achieving two-point fixation to ensure stable fixation. The external air source supplies air to different pneumatic clamping devices through a distributor, ensuring that different pneumatic clamping devices can work simultaneously with the same clamping force. Attached Figure Description

[0019] Figure 1 This is a perspective view of the automobile rear cover adjustment clamp of this utility model; Figure 2 This is the air circuit diagram of the automobile rear cover adjustment clamp of this utility model; Figure 3 yes Figure 1 Enlarged view of point A in the middle.

[0020] In the attached diagram: 1. Clamp body; 2. Pneumatic clamping device; 3. Diverter; 4. Positioning device; 5. Handle; 6. First air pipe; 7. Second air pipe; 8. Flow control valve; 21. Cylinder; 22. First clamping arm; 23. Second clamping arm; 24. First clamping block; 25. Second clamping block; 41. Outer cylinder; 42. Positioning pin; 43. Handle. Detailed Implementation

[0021] The accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. To better illustrate this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting this patent.

[0022] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "long," and "short" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0023] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings: Example 1 like Figure 1 , 2 As shown, a car rear cover adjustment fixture includes a fixture body 1, with pneumatic clamping devices 2 installed at both ends of the fixture body 1. A distributor 3 is provided on the fixture body 1, with its main air port connected to an external air source via a first air pipe 6. The distributor 3 has at least two air distribution ports, and the pneumatic clamping devices 2 are connected to the air distribution ports via a second air pipe 7. The fixture body 1 is used to maintain the basic shape of the fixture and to install and fix various parts. The pneumatic clamping devices 2 are mounted on the fixture body 1 and can clamp the sheet metal on the car body-in-white, generating friction with the sheet metal surface to fix the pneumatic clamping devices 2 to the car body-in-white, ultimately fixing the fixture body 1 to the car body-in-white. The fixture body 1 has parts for cooperating with the rear cover to determine the position of the rear cover. The pneumatic clamping device 2 uses gas as power to clamp the body-in-white. The clamping force of the pneumatic clamping device 2 is determined by the air pressure of the gas driving it. Therefore, to ensure that the clamping force of the pneumatic clamping device 2 does not fluctuate, it is only necessary to provide a stable air source to the pneumatic clamping device 2, thus achieving constant control of the workpiece clamping force. Furthermore, the clamping process is automated, eliminating the need for manual clamping of the body-in-white and avoiding the decrease in clamping force caused by the weakening of manual strength. At least two pneumatic clamping devices 2 are provided, installed at both ends of the fixture body 1. The two ends of the fixture body 1 can be fixed to the body-in-white using the pneumatic clamping devices 2, achieving two-point fixation of the fixture body 1. The pneumatic device is also equipped with a distributor 3, which can evenly distribute the airflow as needed. The external air source enters the distributor 3 through the first air pipe 6, and the distributor 3 evenly distributes the gas to different air outlets. Finally, the gas enters the pneumatic clamping device 2 through the second air pipe 7 connected to the air distribution port, driving the clamping device to operate. This configuration ensures that the pneumatic clamping devices 2 located at both ends of the clamp body 1 can work simultaneously without any time difference, and also ensures that the gas pressure received by the two pneumatic clamping devices 2 is the same, so that the clamping force of the two pneumatic clamping devices 2 is the same.

[0024] like Figure 3As shown, the pneumatic clamping device 2 includes a cylinder 21, a first clamping arm 22, a second clamping arm 23, a first clamping block 24, and a second clamping block 25. The cylinder 21 and one end of the first clamping arm 22 are fixedly mounted on the fixture body 1. The first clamping block 24 is mounted on the other end of the first clamping arm 22. One end of the second clamping arm 23 is connected to the drive end of the cylinder 21, and the second clamping block 25 is mounted on the other end of the second clamping arm 23. The shapes of the first clamping block 24 and the second clamping block 25 match the shape of the vehicle body. The cylinder 21 is connected to the air distribution port via a second air pipe 7. The first clamping arm 22 is fixed to the fixture body 1, and its position does not change; it can be used as a reference for the pneumatic clamping device 2. One end of the second clamping arm 23 is connected to the cylinder 21. The cylinder 21 can drive the other end of the second clamping arm 23 to approach or move away from the first clamping arm 22. The first clamping arm 22 is provided with a first clamping block 24, and the second clamping arm 23 is provided with a second clamping block 25. The first clamping block 24 and the second clamping block 25 are arranged according to the shape of the white body and together clamp the body. In the initial state, there is a gap between the first clamping block 24 and the second clamping block 25. When installing the clamp body 1, the operator first holds the clamp body 1 and makes the first clamping block 24 fit against the part to be clamped on the vehicle body, so that the part to be clamped is between the first clamping block 24 and the second clamping block 25. Then, the external air source is activated, and the external air source supplies air to the cylinder 21, driving the telescopic end in the cylinder 21 to extend, thereby driving the second clamping arm 23 to move, so that the second clamping block 25 located on the second clamping arm 23 moves towards the direction of the first clamping block 24 until it clamps the vehicle body. Then, the external air source can continue to supply air or stop supplying air. After the air supply is stopped, as long as the cylinder 21 does not leak, the existing gas is sufficient to maintain the original pressure output of the cylinder 21. When the cover assembly needs to be removed, the staff controls the external air source to deliver gas in the opposite direction, thereby driving the cylinder 21 to retract, which in turn moves the second clamping arm 23 and causes the second clamping block 25 located on the second clamping arm 23 to move away from the first clamping block 24, so that the staff can directly remove the clamp body 1 from the vehicle body.

[0025] like Figure 3 As shown, the first clamping block 24 is detachably connected to the first clamping arm 22, and the second clamping block 25 is detachably connected to the second clamping arm 23. Different vehicle models have different body shapes, and operators can adapt to different body types by replacing the first clamping block 24 and the second clamping block 25.

[0026] like Figure 1 , 2 As shown, a flow control valve 8 is also installed on the second air pipe 7. The operator can adjust the pressure difference and other parameters by adjusting the opening of the flow control valve 8, and precisely control the gas flow or pressure at each output end to ensure that the air pressure provided to the pneumatic clamping device 2 meets the requirements.

[0027] Example 2 This embodiment is similar to Embodiment 1 above, except that, as Figure 1 As shown, the fixture body 1 is also equipped with a positioning device 4 for determining the position of the rear cover. The positioning device 4 is used to determine the position of the rear cover to ensure the assembly accuracy of the rear cover.

[0028] like Figure 1 As shown, the positioning device 4 includes an outer cylinder 41 with a sliding hole inside. A positioning pin 42 is slidably installed in the sliding hole. A driving device is provided at the end of the outer cylinder 41 away from the rear cover to drive the positioning pin 42 out of the sliding hole. The positioning device 4 determines the position of the rear cover by inserting the positioning pin 42 into the process hole on the rear cover. During assembly, the rear cover is difficult to assemble in one go and its position needs to be adjusted during assembly. If the positioning pin 42 is always exposed, it may scratch the surface of the rear cover during the adjustment process. Therefore, an outer cylinder 41 is needed. Under normal conditions, the positioning pin 42 retracts into the outer cylinder 41 to ensure that the rear cover is not accidentally scratched. When the position of the rear cover is adjusted to be roughly accurate so that the process hole is aligned with the positioning pin 42, the operator operates the driving device to drive the positioning pin 42 out of the outer cylinder 41 and into the process hole on the rear cover. When disassembly is required, the operator only needs to operate the driving device to retract the positioning pin 42 into the outer cylinder 41.

[0029] like Figure 1 As shown, the driving device is a handle 43, and a hinge seat is provided on the outer cylinder 41. The handle 43 is hinged to the hinge seat, and the handle 43 is connected to the positioning pin 42 via a connecting rod. The hinge seat is provided with a locking mechanism to lock the handle 43. By rotating the handle 43 in different directions, the operator can cause the positioning pin 42 to retract or extend from the outer cylinder 41 via the connecting rod. The hinge seat is also provided with a locking mechanism. The handle 43, the hinge seat, and the locking mechanism together constitute a device similar to a hinge clamp. When the handle 43 moves to a preset position, it will automatically lock to prevent the positioning pin 42 from accidentally extending or retracting into the outer cylinder 41.

[0030] like Figure 1 As shown, at least two positioning devices 4 are provided, and the positioning pins 42 in the two positioning devices 4 are a diamond-shaped pin and a round pin, respectively. The presence of at least two positioning devices 4 ensures that the back cover is positioned at at least at two points, guaranteeing the stability of the back cover. The use of a diamond-shaped pin and a round pin for the two positioning pins 42 effectively solves the problem of over-positioning.

[0031] Example 3 This embodiment is similar to Embodiment 1 above, except that, as Figure 1As shown, the fixture body 1 is also equipped with a second positioning pin, which is inserted into a process hole in the vehicle body. The fixture body 1 also has a positioning block that abuts against the surface of the vehicle body. The second positioning pin can be inserted into the process hole in the vehicle body to determine the position of the fixture body 1 on the vehicle body, providing precise positioning for the pneumatic clamping device 2 to clamp the vehicle body. The positioning block on the fixture body 1 is used to assist in supporting the fixture body 1, ensuring that the fixture body 1 is securely installed on the vehicle body without shaking.

[0032] like Figure 1 As shown, the clamp body 1 is equipped with two handles 5, arranged left and right. The two handles 5 are convenient for the operator to hold the clamp body 1 with both hands.

[0033] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An automotive deck lid alignment fixture, characterized by, Includes a clamp body (1), with pneumatic clamping devices (2) installed at both ends of the clamp body (1), and a distributor (3) provided on the clamp body (1). The main air hole of the distributor (3) is connected to an external air source through a first air pipe (6). The distributor (3) has at least two air distribution holes. The pneumatic clamping device (2) is connected to the air distribution holes (7) through a second air pipe.

2. The automotive deck lid alignment fixture of claim 1, wherein, The pneumatic clamping device (2) includes a cylinder (21), a first clamping arm (22), a second clamping arm (23), a first clamping block (24), and a second clamping block (25). The cylinder (21) and one end of the first clamping arm (22) are fixedly installed on the clamp body (1). The first clamping block (24) is installed on the other end of the first clamping arm (22). One end of the second clamping arm (23) is connected to the driving end of the cylinder (21). The second clamping block (25) is installed on the other end of the second clamping arm (23). The shapes of the first clamping block (24) and the second clamping block (25) match the shape of the vehicle body. The cylinder (21) is connected to the air distribution hole through the second air pipe (7).

3. The automotive deck lid adjustment fixture of claim 2, wherein, The first clamping block (24) is detachably connected to the first clamping arm (22), and the second clamping block (25) is detachably connected to the second clamping arm (23).

4. The automotive deck lid alignment fixture of claim 1, wherein, A flow control valve (8) is also provided on the second air pipe (7).

5. The automotive deck lid alignment fixture of claim 1, wherein, The clamp body (1) is also provided with a positioning device (4) for determining the position of the back cover.

6. The automotive deck lid alignment fixture of claim 5, wherein, The positioning device (4) includes an outer cylinder (41), a sliding hole is provided inside the outer cylinder (41), a positioning pin (42) is slidably installed in the sliding hole, and a driving device is provided on the outer cylinder (41) away from the rear cover to drive the positioning pin (42) to extend out of the sliding hole.

7. The automotive deck lid adjustment fixture of claim 6, wherein, The driving device is a handle (43), and a hinge seat is provided on the outer cylinder (41). The handle (43) is hinged to the hinge seat. The handle (43) is connected to the positioning pin (42) through a connecting rod. A locking mechanism for locking the handle (43) is provided on the hinge seat.

8. The automotive deck lid adjustment fixture of claim 6, wherein, The positioning device (4) is provided in at least two parts, and the positioning pins (42) in the two positioning devices (4) are a diamond pin and a round pin, respectively.

9. The automotive deck lid adjustment fixture of claim 1, wherein, The fixture body (1) is also provided with a second positioning pin, which is inserted into the vehicle body process hole. The fixture body (1) is also provided with a positioning block, which abuts against the surface of the vehicle body.

10. A car rear cover adjustment clamp according to claim 1, characterized in that, The clamp body (1) is provided with a handle (5), and there are two handles (5), which are arranged on the left and right sides.

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