Overline shared axle tightening system and tightening method

Abstract

The invention discloses an overline shared axle tightening system and method. The overline shared axle tightening system comprises a system frame erected above a conveying line of a plate spring suspension axle and a conveying line of an air suspension axle. The plate suspension axle lifting mechanism is used for lifting the plate spring suspension axle; the press-fitting arm is connected to the system frame, can ascend and descend and is used for press-fitting an axle shaft of a plate spring suspension axle; the air suspension axle lifting mechanism is used for lifting an air suspension axle; a tightening machine capable of moving left and right and lifting is arranged on the system frame, and the tightening machine can move left and right and move up and down to the position above the conveying line of the plate spring suspension axle or the position above the conveying line of the air suspension axle. The tightening system designed by the invention not only meets the tightening requirements of two axle conveying lines, but also meets the press fitting requirements of a specific axle conveying line, so that collinear tightening of two axles becomes possible, the cost is greatly reduced, the space utilization rate is improved, and the production process is optimized.

Description

Technical Field

[0001] This invention relates to the field of automobile production line equipment technology, specifically to a cross-line shared axle tightening system and tightening method. Background Technology

[0002] As a core load-bearing component of the automotive chassis, the assembly quality of the axle directly determines the vehicle's driving safety, stability, and load-bearing capacity. During axle manufacturing, the bolt tightening process is a crucial step, demanding extremely strict requirements on tightening torque, precision, and consistency. Therefore, specialized automated bolt tightening machines are typically used to ensure that assembly quality meets industry standards and OEM technical specifications.

[0003] In the existing axle production system, leaf spring axles and air suspension axles are two widely used axle types. Due to significant differences in structural design, load-bearing principles, and assembly requirements, their assembly processes are completely different. Specifically, the connection method between the leaf spring assembly and the axle body, the bolt distribution, and the tightening torque requirements of leaf spring axles are fundamentally different from the assembly processes of components such as air spring brackets and guide mechanisms in air suspension axles. Therefore, it is impossible to complete the full assembly process of both types of axles on the same assembly line.

[0004] Based on the differences in assembly processes mentioned above, the existing production model typically employs a parallel production approach with two lines, A and B. Line A is dedicated to assembling leaf spring axles, while line B is dedicated to assembling air suspension axles. Considering the crucial role of bolt tightening in axle assembly and the tightening requirements of different assembly stations, each line needs to be equipped with at least two automated tightening machines, corresponding to the bolt tightening operations of different parts of the axle (leaf spring / airbag bracket and axle body connection, etc.). This results in a total of four automated tightening machines being required across the two lines.

[0005] However, in actual production, influenced by factors such as market demand fluctuations, changes in order structure, and adjustments to production plans, the production cycle time of lines A and B is often at a low level, and the production load of the two lines is difficult to achieve a complete balance. Under these circumstances, the four tightening machines operate at less than full capacity for extended periods, generally exhibiting low utilization rates, typically less than 50%. On the one hand, automated tightening machines, as high-precision, high-value production equipment, have high unit purchase costs, and the initial investment cost of four machines places significant financial pressure on the company. On the other hand, long-term idleness of the equipment not only wastes valuable production resources but also increases additional costs such as daily maintenance, upkeep, and space occupancy. Furthermore, excessive equipment configuration leads to complex production line layouts, reduces space utilization on the production floor, and hinders production process optimization and efficiency improvement.

[0006] Therefore, how to optimize the configuration of tightening machines for the dual-line production of leaf spring and air suspension axles, while ensuring the assembly quality and production continuity of both types of axles, to reduce the number of tightening machines, lower equipment and operating costs, and improve equipment uptime and resource utilization, has become an urgent technical problem to be solved in the current axle production field. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the above-mentioned background technology and provide a cross-line shared axle tightening system and method that can reduce the number of tightening machines, reduce equipment and operating costs, and improve equipment uptime and resource utilization while ensuring the assembly quality and production continuity of two types of axles.

[0008] To achieve this objective, the cross-line shared axle tightening system designed in this invention includes a system frame erected above the conveyor lines of the leaf spring suspension axle and the air suspension axle; a leaf spring suspension axle lifting mechanism for raising and lowering the leaf spring suspension axle; a lifting arm connected to the system frame for pressing the axle shaft of the leaf spring suspension axle; and an air suspension axle lifting mechanism for raising and lowering the air suspension axle; a tightening machine that can move left and right and rise and fall is provided on the system frame, and the tightening machine can reach above the conveyor lines of the leaf spring suspension axle or the air suspension axle through left and right movement and rising and falling movement.

[0009] Furthermore, a press-fit bracket is fixed on the system frame, and a press-fit drive mechanism for driving the press-fit arm to move up and down is fixed on the press-fit bracket.

[0010] Furthermore, the press-fitting drive mechanism includes a press-fitting drive mechanism housing fixed to the press-fitting bracket and a press-fitting drive connector that is fixed to the press-fitting arm and is liftable.

[0011] Furthermore, the system frame is provided with a transfer mechanism that can move left and right, and the tightening machine is connected to the lower part of the transfer mechanism through a tightening machine lifting mechanism.

[0012] Furthermore, the transfer mechanism includes a transfer track fixed to the system frame in the left-right direction and a transfer trolley disposed on the transfer track, and the tightening machine lifting mechanism includes a slide rail slider mechanism connected between the tightening machine and the transfer trolley and a lifting drive mechanism for driving the tightening machine to lift.

[0013] Furthermore, the leaf spring suspension axle lifting mechanism includes a leaf spring limiting fixture for supporting and limiting the leaf springs on the left and right sides of the leaf spring suspension axle, and a first lifting drive mechanism for driving the leaf spring limiting fixture to rise and fall. The first lifting drive mechanism includes a first lifting drive mechanism housing fixed on the leaf spring base and a first lifting drive connector fixed to the leaf spring limiting fixture and capable of rising and falling.

[0014] Furthermore, the plate suspension base is provided with a plate spring fixture support mechanism for supporting the raised plate spring limiting fixture. The plate spring fixture support mechanism includes two plate spring fixture support drive mechanisms respectively disposed on the left and right sides of the conveyor line of the plate spring suspension axle and fixed to the plate suspension base in the horizontal direction. The plate spring fixture support drive mechanism includes a plate spring fixture support drive mechanism housing fixed to the plate suspension base and a plate spring fixture support drive connector fixed to the first support seat and capable of reciprocating in the horizontal direction. The first support seat is slidably disposed on the plate suspension support and can slide below the plate spring limiting fixture to support the plate spring limiting fixture.

[0015] Furthermore, the air suspension axle lifting mechanism includes air suspension limiting fixtures for supporting and limiting the left and right sides of the air suspension axle and a second lifting drive mechanism for driving the air suspension limiting fixtures to rise and fall. The second lifting drive mechanism includes a second lifting drive mechanism housing fixed on the air suspension base and a second lifting drive connector fixed to the air suspension limiting fixture and capable of rising and falling.

[0016] Furthermore, the air suspension base is provided with an air suspension fixture support mechanism for supporting the air suspension limiting fixture after it is raised. The air suspension fixture support mechanism includes two air suspension fixture support drive mechanisms respectively disposed on the left and right sides of the conveyor line of the air suspension axle and fixed to the air suspension base in the horizontal direction. The air suspension fixture support drive mechanism includes an air suspension fixture support drive mechanism housing fixed to the air suspension base and an air suspension fixture support drive connector fixed to the second support seat and capable of reciprocating in the horizontal direction. The second support seat is slidably disposed on the air suspension support and can slide below the air suspension limiting fixture to support the air suspension limiting fixture.

[0017] Furthermore, a tightening method for a cross-line shared axle tightening system includes: a leaf spring suspension axle conveyor transporting the leaf spring suspension axle to below a pressing arm; a leaf spring suspension axle lifting mechanism lifting the leaf spring suspension axle to a pressing position corresponding to the pressing arm; the pressing arm lowering to perform a pressing operation on the axle shaft of the leaf spring suspension axle; a tightening machine moving left and right to reach above the leaf spring suspension axle and lowering to a tightening operation position corresponding to the leaf spring suspension axle to perform a tightening operation on the leaf spring suspension axle; an air suspension axle conveyor transporting the air suspension axle to a tightening position corresponding to the tightening machine; an air suspension axle lifting mechanism lifting the air suspension axle to a tightening position corresponding to the tightening machine; the tightening machine moving left and right to reach above the air suspension axle and lowering to a tightening operation position corresponding to the air suspension axle to perform a tightening operation on the air suspension axle.

[0018] The beneficial effects of this invention are as follows: By arranging the tightening machine's motion track and lifting equipment within a system framework, the tightening machine can switch back and forth between two axle conveyor lines. This eliminates the need for multiple tightening machines on each axle conveyor line; a single, cross-line movable tightening machine can meet the tightening requirements of both types of axles, significantly reducing the number of high-precision tightening machines required and alleviating initial financial pressure on the enterprise. The tightening machine can flexibly switch between the two conveyor lines via left-right movement and lifting, effectively balancing the production load of the two lines, preventing long-term equipment idleness, significantly increasing the tightening machine's utilization rate, and fully maximizing its value. Reducing the number of machines correspondingly lowers daily maintenance and upkeep costs, while also saving space, simplifying the production line layout, improving the utilization rate of production space, and facilitating production process optimization. Through a dedicated plate-suspension / air-suspension axle lifting mechanism, limiting fixtures, and support mechanisms, the assembly positions of the two types of axles are precisely positioned. The tightening machine's movement and lifting mechanisms ensure that it can adapt to the tightening process requirements of different axles, with tightening accuracy and consistency meeting industry standards and not affecting production continuity. In addition, pressing arms can be arranged based on the system framework to meet the pressing requirements of leaf spring suspension axles.

[0019] In summary, the tightening system designed in this invention not only meets the tightening requirements of two axle conveyor lines, but also meets the pressing requirements of a specific axle conveyor line, making it possible to tighten two axles on the same line, greatly reducing costs, improving space utilization, and optimizing the production process. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments disclosed in this invention, the accompanying drawings of the embodiments will be briefly described below. These drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention.

[0021] Figure 1 A perspective view of the cross-line shared axle tightening system designed for this invention;

[0022] Figure 2 A front view of the tightening machine located on one side of the air suspension axle in the cross-line shared axle tightening system designed for this invention;

[0023] Figure 3 A front view of the tightening machine located on one side of the leaf spring suspension axle in the cross-line shared axle tightening system designed for this invention;

[0024] Figure 4 This is a perspective view of the tightening operation performed by the tightening machine on the leaf spring suspension axle in this invention;

[0025] Figure 5 This is a front view of the leaf spring suspension axle lifting mechanism and leaf spring tooling support drive mechanism in the present invention for lifting and supporting the leaf spring suspension axle.

[0026] Figure 6 This is a perspective view of the tightening operation of the tightening machine on the air suspension axle in this invention;

[0027] Figure 7 This is a front view of the tightening operation of the tightening machine on the air suspension axle in this invention;

[0028] Figure 8 This is a front view of the movement process of the tightening machine in this invention;

[0029] Figure 9 This is a perspective view of the press arm mounted on the press bracket in this invention;

[0030] Figure 10 This is a perspective view of the conveying structure of the leaf spring suspension axle in this invention;

[0031] Figure 11 This is a front view of the lifting and support mechanism of the leaf spring suspension axle in this invention;

[0032] Figure 12 This is a front view of the lifting and supporting mechanism of the leaf spring suspension axle in this invention.

[0033] Figure 13 This is a perspective view of the lifting and support mechanism of the leaf spring suspension axle in this invention;

[0034] Figure 14 This is a perspective view of the lifting and support mechanism of the air suspension axle in this invention;

[0035] Figure 15 This is a front view of the conveying structure of the air suspension axle in this invention;

[0036] Figure 16 This is a front view of the lifting and supporting mechanism of the air suspension axle in this invention.

[0037] Figure 17 This is a perspective view of the transfer mechanism in this invention;

[0038] Among them, 1—leaf spring suspension axle (1.1—axle shaft, 1.2—leaf spring), 2—air suspension axle, 3—system frame, 4—leaf spring suspension axle lifting mechanism (4.1—leaf spring limiting fixture, 4.2—first lifting drive mechanism), 5—pressing arm, 6—air suspension axle lifting mechanism (6.1—air suspension limiting fixture, 6.2—second lifting drive mechanism), 7—tightening machine, 8—pressing bracket, 9—transfer mechanism (9.1—transfer track, 9.2—transfer trolley), 10—tightening machine lifting mechanism (10.1—slide rail slider mechanism, 10.2—lifting drive mechanism), 11—leaf spring suspension base, 12—first lifting drive mechanism housing, 13—first lifting drive mechanism housing. 14—Leaf spring tooling support drive mechanism (14.1—Leaf spring tooling support drive mechanism housing, 14.2—Leaf spring tooling support drive connecting piece), 15—First support seat, 16—Suspension base, 17—Second lifting drive mechanism housing, 18—Second lifting drive connecting piece, 19—Suspension tooling support drive mechanism (19.1—Suspension tooling support drive mechanism housing, 19.2—Suspension tooling support drive connecting piece), 20—Second support seat, 21—Pressure fitting drive mechanism, 22—Leaf suspension axle conveyor line bracket, 23—Leaf suspension axle pallet, 24—Suspension axle conveyor line bracket, 25—Suspension axle pallet, 26—Guide rod, 27—Coding ruler. Detailed Implementation

[0039] The technical solutions (including preferred technical solutions) of the present invention will be further described in detail below with reference to the accompanying drawings and by way of listing some optional embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0040] Example 1

[0041] like Figure 1 As shown in Figure 17, this invention designs a cross-line shared axle tightening system:

[0042] like Figure 1As shown in Figure 3, the system includes a system frame 3 erected above the conveyor lines of the leaf spring suspension axle 1 and the air suspension axle 2; a leaf spring suspension axle lifting mechanism 4 for lifting the leaf spring suspension axle 1; a lifting and lowering pressing arm 5 connected to the system frame 3 for pressing the axle shaft 1.1 of the leaf spring suspension axle 1; and an air suspension axle lifting mechanism 6 for lifting the air suspension axle 2. A tightening machine 7, which can move left and right and rise and fall, is installed on the system frame 3. The tightening machine 7 can reach above the conveyor lines of the leaf spring suspension axle 1 or the air suspension axle 2 through left and right movement and lifting and falling motion.

[0043] like Figure 10 As shown, the conveyor line of the leaf spring suspension axle 1 is arranged on the leaf spring suspension axle conveyor line bracket 22. The conveyor line of the leaf spring suspension axle 1 includes a leaf spring suspension axle tray 23 for supporting the leaf spring suspension axle 1 and conveying the leaf spring suspension axle 1 to the tightening machine 7.

[0044] like Figure 15 As shown, the air suspension axle 2 conveyor line is arranged on the air suspension axle conveyor line bracket 24. The air suspension axle 2 conveyor line includes an air suspension axle tray 25 for supporting the air suspension axle 2 and conveying the air suspension axle 2 to the tightening machine 7.

[0045] like Figure 1 As shown in Figure 3, a press-fit bracket 8 is fixed on the system frame 3, such as... Figure 9 As shown, a hydraulic cylinder or pneumatic cylinder (pressing drive mechanism 21) for driving the pressing arm 5 to move up and down is fixed on the pressing bracket 8. The hydraulic cylinder or pneumatic cylinder includes a hydraulic cylinder or pneumatic cylinder housing (pressing drive mechanism housing) fixed on the pressing bracket 8 and a piston rod (pressing drive connector) fixed to the pressing arm 8 and capable of being raised and lowered. The hydraulic cylinder or pneumatic cylinder provides pressing force to the pressing arm 5, enabling the pressing arm 5 to complete the pressing operation.

[0046] like Figure 1 As shown in Figure 3, a movable transfer mechanism 9 is provided on the system frame 3, and the tightening machine 7 is connected to the lower part of the transfer mechanism 9 through a tightening machine lifting mechanism 10. Figure 17 As shown, the transfer mechanism 9 includes a transfer track 9.1 fixed to the system frame 3 in the left-right direction and a transfer trolley 9.2 disposed on the transfer track 9.1, as... Figure 1 As shown, the tightening machine lifting mechanism includes a slide rail slider mechanism 10.1 connected between the tightening machine 7 and the transfer trolley 9.2, and a hydraulic cylinder or air cylinder (lifting drive mechanism 10.2) for driving the tightening machine 7 to lift.

[0047] like Figure 4 —5 and Figure 10As shown in Figure 13, the leaf spring suspension axle lifting mechanism 4 includes two leaf spring limiting fixtures 4.1 that respectively support and limit the leaf springs 1.2 on the left and right sides of the leaf spring suspension axle 1, and four first lifting drive mechanisms 4.2 that drive the leaf spring limiting fixtures 4.1 to lift. The first lifting drive mechanism 4.2 is a hydraulic cylinder or pneumatic cylinder, including a hydraulic cylinder or pneumatic cylinder housing (first lifting drive mechanism housing 12) fixed to the leaf spring limiting fixture 4.1 and a piston rod (first lifting drive connector 13) that is fixed to and can be lifted. The leaf spring suspension base 11 is provided with two leaf spring fixture support mechanisms on the left and right sides for supporting the leaf spring limiting fixture 4.1 after it is raised. The leaf spring fixture support mechanism includes two leaf spring fixture support drive mechanisms 14, which are respectively set on the left and right sides of the conveyor line of the leaf spring suspension axle 1 and fixed to the leaf spring suspension base 11 in the horizontal direction. The leaf spring fixture support drive mechanism 14 includes a hydraulic cylinder or a pneumatic cylinder fixed to the leaf spring suspension base 11. The hydraulic cylinder or pneumatic cylinder includes a hydraulic cylinder or pneumatic cylinder housing (leaf spring fixture support drive mechanism housing 14.1) fixed to the leaf spring suspension base 11 and a piston rod (leaf spring fixture support drive connector 14.2) fixed to the first support seat 15 and capable of reciprocating in the horizontal direction. The first support seat 15 is slidably set on the leaf spring suspension support 11 and can slide below the leaf spring limiting fixture 4.1 to support the leaf spring limiting fixture 4.1.

[0048] like Figure 6 —7 and Figure 14 As shown in Figure 16, the air suspension axle lifting mechanism 6 includes two air suspension limiting fixtures 6.1 that support and limit the left and right sides of the air suspension axle 2, and four second lifting drive mechanisms 6.2 that drive the air suspension limiting fixtures 6.1 to lift. The second lifting drive mechanism 6.2 includes a hydraulic cylinder or pneumatic cylinder fixed to the air suspension base 16. The hydraulic cylinder or pneumatic cylinder includes a hydraulic cylinder or pneumatic cylinder housing (second lifting drive mechanism housing 17) fixed to the air suspension base 16 and a piston rod (second lifting drive connector 18) fixed to the air suspension limiting fixtures 6.1 and capable of being lifted. The air suspension base 16 is provided with two air suspension fixture support mechanisms on the left and right sides for supporting the air suspension limiting fixture 6.1 after it is raised. The air suspension fixture support mechanism includes two air suspension fixture support drive mechanisms 19, which are respectively set on the left and right sides of the conveyor line of the air suspension axle 2 and fixed to the air suspension base 16 in the horizontal direction. The air suspension fixture support drive mechanism 19 includes a hydraulic cylinder or a pneumatic cylinder fixed to the air suspension base 16. The hydraulic cylinder or pneumatic cylinder includes a hydraulic cylinder or pneumatic cylinder housing (air suspension fixture support drive mechanism housing 19.1) fixed to the air suspension base 16 and a piston rod (air suspension fixture support drive connector 19.2) fixed to the second support seat 20 and capable of reciprocating in the horizontal direction. The second support seat 20 is slidably set on the air suspension support 16 and can slide below the air suspension limiting fixture 6.1 to support the air suspension limiting fixture 6.1.

[0049] Example 2

[0050] Based on Example 1, the present invention designs a method for tightening axles that are shared across lines:

[0051] like Figure 8 As shown, the conveyor line of the leaf spring suspension axle 1 transports the leaf spring suspension axle 1 to below the pressing arm 5. The leaf spring suspension axle lifting mechanism 4 lifts the leaf spring suspension axle 1 to the pressing position corresponding to the pressing arm 5 (the leaf spring limiting fixture 4.1 supports and limits the leaf spring 1.2, and the piston rod of the hydraulic cylinder or pneumatic cylinder (first lifting drive mechanism 4.2) extends, driving the leaf spring limiting fixture 4.1 to lift the leaf spring suspension axle 1). The pressing arm 5 is driven to descend by the hydraulic cylinder or pneumatic cylinder to perform the pressing operation on the axle shaft 1.1 of the leaf spring suspension axle 1. The tightening machine 7 moves to above the leaf spring suspension axle 1 via the movement of the transfer trolley 9.2 on the transfer track 9.1. Through the hydraulic cylinder or pneumatic cylinder in conjunction with the slide rail slider mechanism 10.1, the tightening machine 7 is driven to descend to the tightening operation position corresponding to the leaf spring suspension axle 1 to perform the tightening operation on the leaf spring suspension axle 1.

[0052] The tightening operation of the air suspension axle 2 is similar to that of the leaf spring suspension axle 1. The conveyor line of the air suspension axle 2 transports the air suspension axle 2 to the tightening position corresponding to the tightening machine 7. The air suspension axle lifting mechanism 6 lifts the air suspension axle 2 to the tightening position corresponding to the tightening machine 7 (the air suspension limiting fixture 6.1 supports and limits the shaft of the air suspension axle 2, and the piston rod of the hydraulic cylinder or air cylinder (second lifting drive mechanism 6.2) extends, driving the air suspension limiting fixture 6.1 to lift the air suspension axle 2). The tightening machine 7 moves to the top of the air suspension axle 2 via the movement of the transfer trolley 9.2 on the transfer track 9.1. Through the hydraulic cylinder or air cylinder in conjunction with the slide rail slider mechanism 10.1, the tightening machine 7 is driven to descend to the tightening operation position corresponding to the air suspension axle 2 to perform the tightening operation on the air suspension axle 2.

[0053] In summary, the tightening system designed in this invention not only meets the tightening requirements of two axle conveyor lines, but also meets the pressing requirements of a specific axle conveyor line, making it possible to tighten two axles on the same line, greatly reducing costs, improving space utilization, and optimizing the production process.

[0054] It should be noted that the above description of the technical solutions is exemplary, and this specification may be embodied in different forms and should not be construed as limiting itself to the technical solutions set forth herein. Rather, providing these descriptions will ensure that the disclosure of this invention is thorough and complete, and will fully convey the scope of this specification to those skilled in the art. Furthermore, the technical solutions of this invention are defined only by the scope of the claims. When using terms such as "comprising," "having," and "including" as described in this specification, there may also be another part or other components, and the terms used are generally singular but may also represent plural forms. It should be pointed out that although various different components may appear and be described in this specification using terms such as "first," "second," "top," "bottom," "one side," "the other side," "one end," "the other end," etc., these components and parts should not be limited by these terms. These terms are only used to distinguish one component and part from another component and part. For example, without departing from the scope of this specification, a first component may be referred to as a second component, and similarly, a second component may be referred to as a first component; top and bottom components may, in certain cases, be interchanged or converted; components at one end and at the other end may have the same or different performance characteristics.

[0055] Finally, it should be noted that the above embodiments are merely representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments and many variations are possible. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention should be considered within the protection scope of the present invention.

Claims

1. A shared axle tightening system for cross-line applications, characterized in that: The system includes a system frame (3) mounted above the conveyor line of the leaf spring suspension axle (1) and the conveyor line of the air suspension axle (2); a leaf spring suspension axle lifting mechanism (4) for lifting the leaf spring suspension axle (1); a lifting and pressing arm (5) connected to the system frame (3) for pressing the axle shaft (1.1) of the leaf spring suspension axle (1) and an air suspension axle lifting mechanism (6) for lifting the air suspension axle (2); a tightening machine (7) that can move left and right and lift up is provided on the system frame (3), and the tightening machine (7) can reach above the conveyor line of the leaf spring suspension axle (1) or the conveyor line of the air suspension axle (2) through left and right movement and lifting up movement.

2. The cross-line shared axle tightening system as described in claim 1, characterized in that: A press-fit bracket (8) is fixed on the system frame (3), and a press-fit drive mechanism (21) for driving the press-fit arm (5) to move up and down is fixed on the press-fit bracket (8).

3. The cross-line shared axle tightening system as described in claim 2, characterized in that: The press-fitting drive mechanism includes a press-fitting drive mechanism housing fixed on the press-fitting bracket (8) and a press-fitting drive connector that is fixed to the press-fitting arm (8) and can be raised and lowered.

4. The cross-line shared axle tightening system as described in claim 1, characterized in that: The system frame (3) is provided with a moving mechanism (9) that can move left and right, and the tightening machine (7) is connected to the lower part of the moving mechanism (9) through the tightening machine lifting mechanism (10).

5. The cross-line shared axle tightening system as described in claim 4, characterized in that: The transfer mechanism (9) includes a transfer track (9.1) fixed to the system frame (3) in the left-right direction and a transfer trolley (9.2) set on the transfer track (9.1). The tightening machine lifting mechanism includes a slide rail slider mechanism (10.1) connected between the tightening machine (7) and the transfer trolley (9.2) and a lifting drive mechanism (10.2) for driving the tightening machine (7) to lift.

6. The cross-line shared axle tightening system as described in claim 1, characterized in that: The leaf spring suspension axle lifting mechanism (4) includes a leaf spring limiting fixture (4.1) for supporting and limiting the leaf springs (1.2) on the left and right sides of the leaf spring suspension axle (1) and a first lifting drive mechanism (4.2) for driving the leaf spring limiting fixture (4.1) to lift. The first lifting drive mechanism (4.2) includes a first lifting drive mechanism housing (12) fixed on the leaf spring suspension base (11) and a first lifting drive connector (13) fixed to the leaf spring limiting fixture (4.1) and capable of lifting.

7. The cross-line shared axle tightening system as described in claim 6, characterized in that: The leaf spring suspension base (11) is provided with a leaf spring fixture support mechanism for supporting the leaf spring limiting fixture (4.1) after it is raised. The leaf spring fixture support mechanism includes two leaf spring fixture support drive mechanisms (14) respectively set on the left and right sides of the conveyor line of the leaf spring suspension axle (1) and fixed on the leaf spring suspension base (11) in the horizontal direction. The leaf spring fixture support drive mechanism (14) includes a leaf spring fixture support drive mechanism housing (14.1) fixed on the leaf spring suspension base (11) and a leaf spring fixture support drive connector (14.2) fixed to the first support seat (15) and movable back and forth in the horizontal direction. The first support seat (15) is slidably set on the leaf spring suspension support (11) and can slide below the leaf spring limiting fixture (4.1) to support the leaf spring limiting fixture (4.1).

8. The cross-line shared axle tightening system as described in claim 1, characterized in that: The air suspension axle lifting mechanism (6) includes an air suspension limiting fixture (6.1) for supporting and limiting the left and right sides of the air suspension axle (2) and a second lifting drive mechanism (6.2) for driving the air suspension limiting fixture (6.1) to lift. The second lifting drive mechanism (6.2) includes a second lifting drive mechanism housing (17) fixed on the air suspension base (16) and a second lifting drive connector (18) fixed to the air suspension limiting fixture (6.1) and capable of being lifted.

9. The cross-line shared axle tightening system as described in claim 8, characterized in that: The air suspension base (16) is provided with an air suspension fixture support mechanism for supporting the air suspension limiting fixture (6.1) after it is raised. The air suspension fixture support mechanism includes two air suspension fixture support drive mechanisms (19) respectively set on the left and right sides of the conveyor line of the air suspension axle (2) and fixed on the air suspension base (16) in the horizontal direction. The air suspension fixture support drive mechanism (19) includes an air suspension fixture support drive mechanism housing (19.1) fixed on the air suspension base (16) and an air suspension fixture support drive connector (19.2) fixed to the second support seat (20) and movable back and forth in the horizontal direction. The second support seat (20) is slidably set on the air suspension support (16) and can slide below the air suspension limiting fixture (6.1) to support the air suspension limiting fixture (6.1).

10. A tightening method for a cross-line shared axle tightening system as described in any one of claims 1-9, characterized in that: include: The conveyor line of the leaf spring suspension axle (1) transports the leaf spring suspension axle (1) to below the pressing arm (5). The leaf spring suspension axle lifting mechanism (4) lifts the leaf spring suspension axle (1) to the pressing position corresponding to the pressing arm (5). The pressing arm (5) descends to perform pressing operation on the axle shaft (1.1) of the leaf spring suspension axle (1). The tightening machine (7) moves left and right to reach above the leaf spring suspension axle (1) and descends to the tightening operation position corresponding to the leaf spring suspension axle (1) to tighten the leaf spring suspension axle. The suspension axle (1) is tightened; the air suspension axle (2) is conveyed by the conveyor line to the tightening position corresponding to the tightening machine (7). The air suspension axle lifting mechanism (6) lifts the air suspension axle (2) to the tightening position corresponding to the tightening machine (7). The tightening machine (7) moves left and right to reach above the air suspension axle (2) and descends to the tightening operation position corresponding to the air suspension axle (2) to tighten the air suspension axle (2).

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