Tightening machine for steering knuckle

Abstract

A tightening machine for a steering knuckle comprises a machine body and is characterized in that the machine body is provided with a positioning part, a clamping part, a clamping part, a clamping part and a tightening part, and the positioning part is used for positioning the wheel center of the steering knuckle to be machined so that a through hole of the steering knuckle to be machined can be placed upwards; the tightening mechanism is positioned above the positioning part and is used for tightening a nut in the through hole of the left steering knuckle or the right steering knuckle to be machined; the tightening mechanism comprises a tightening gun for tightening a nut, a first moving mechanism for driving the tightening gun to move up and down and a second moving mechanism for driving the tightening gun to move left and right, and the second moving mechanism drives the tightening gun to move left and right so as to align to a through hole in the first branch part of the left steering knuckle or a through hole in the first branch part of the right steering knuckle; the first moving mechanism drives the tightening gun to move up and down so that the tightening gun can tighten the nut. The utility model has the advantages that the tightening machine not only can be used for processing different steering knuckles, but also can be used for processing the left and right types of the same steering knuckle, so that the processing range is effectively enlarged.

Description

Technical Field

[0001] The utility model relates to the technical field of steering knuckle processing equipment, in particular to a tightening machine for steering knuckles. Background Art

[0002] The steering knuckle is one of the main parts on the steering axle of a car, which can make the car run stably and transmit the driving direction sensitively. The shape of the steering knuckle is generally an irregular triangle or other similar shapes. Therefore, the nut is mainly installed on the steering knuckle by manual tightening, which leads to problems such as high labor intensity of workers and low production efficiency. For this reason, the tightening machine of the steering knuckle in the prior art is shown in the Chinese application with patent number ZL201911337616.7 (application publication number CN110842534A). The tightening machine can place the steering knuckle in the center positioning sleeve, the positioning lifting cylinder can adjust the steering knuckle to the correct position, and the positioning clamping cylinder can clamp the extended arm of the steering knuckle. Then the main machine part of the tightening machine descends, and the electric tightening shaft automatically rotates to complete the tightening of the steering knuckle bolt.

[0003] Although the above tightening machine can tighten the bolts on the steering knuckle, the existing automobiles widely use MacPherson suspension, and the steering knuckles suitable for MacPherson suspension are as follows: Figure 1 and Figure 2As shown, a wheel center 11' connected to a wheel hub bearing is provided at the center of the steering knuckle 1', and the steering knuckle 1' has three branches for connecting to the vehicle body. The first branch 12' at the top of the steering knuckle 1' has a through hole 121', and the steering knuckle 1' can be connected to the suspension of the vehicle body by means of the through hole 121'. The second branch 13' at the bottom of the steering knuckle 1' is in an elongated arc shape, and the steering knuckle 1' can be rotatably connected to the first control arm through the second branch 13'. The steering knuckle 1' is also provided with a third branch 14' along the direction of travel of the vehicle body, and the third branch 14' can be rotatably connected to the second control arm. Among them, the first branch 12' of the steering knuckle 1' needs to be installed with a ball pin at the through hole 121' to achieve the connection between the steering knuckle 1' and the suspension, so a nut needs to be installed at the through hole 121' of the first branch 12'. If the above-mentioned tightening machine is used to tighten the nut at the through hole 121′, the tightening machine needs to be aligned with the through hole 121′ of the steering knuckle 1′. Since the steering knuckle 1′ is divided into left and right models, the positions of the through holes 121′ of the left and right steering knuckles 1′ are different, and the above-mentioned tightening machine can only move up and down vertically, but cannot move left and right, resulting in the tightening machine being unable to align one by one with the through holes 121′ of the left and right steering knuckles 1′, thereby being unable to tighten the nut, and further limiting the use of the tightening machine. In addition, in order to facilitate the processing of the through hole 121′ of the steering knuckle 1′, the steering knuckle 1′ needs to be placed vertically on the working platform, that is, the second branch 13′ is supported on the working platform. Since the second branch 13′ is in the shape of an elongated arc, the second branch 13′ cannot stably support the steering knuckle 1′, thereby affecting the processing effect of the tightening machine. For this reason, it is necessary to make further improvements to the tightening machine for the steering knuckle. Summary of the invention

[0004] The first technical problem to be solved by the utility model is to provide a tightening machine that can better tighten the nut at the connection between the steering knuckle and the suspension in response to the above-mentioned existing technical status, especially for the situation where both the left and right models of the same steering knuckle need to be processed.

[0005] The second technical problem to be solved by the present invention is to provide a tightening machine capable of processing a steering knuckle more stably, especially suitable for steering knuckles of various forms, in view of the above-mentioned existing technical status.

[0006] The technical solution adopted by the utility model to solve the first technical problem is as follows: the tightening machine for the steering knuckle comprises a machine body, wherein the machine body is provided with a working platform for processing the steering knuckle to be processed, wherein the steering knuckle to be processed comprises a wheel center located at the center, a first branch located at the top for connecting with the suspension of the vehicle body, a through hole capable of installing a nut is provided on the first branch, the steering knuckle to be processed is divided into a left steering knuckle and a right steering knuckle, the first branch of the left steering knuckle is located on the right side, and the first branch of the right steering knuckle is located on the left side;

[0007] The feature is that: the machine body is also provided with:

[0008] A positioning part, used for positioning the wheel center of the steering knuckle to be processed so that the through hole for the steering knuckle to be processed is placed upward;

[0009] A tightening mechanism is located above the positioning portion and is used to tighten the nut of the through hole of the left steering knuckle or the right steering knuckle to be processed; the tightening mechanism includes a tightening gun for tightening the nut, a first moving mechanism that drives the tightening gun to move up and down, and a second moving mechanism that drives the tightening gun to move left and right, the second moving mechanism drives the tightening gun to move left and right to align with the through hole on the first branch of the left steering knuckle or the through hole on the first branch of the right steering knuckle, and the first moving mechanism drives the tightening gun to move up and down to enable the tightening gun to tighten the nut.

[0010] In order to solve the second technical problem, that is, to make the same tightening machine applicable to different steering knuckles, such as the steering knuckle of McPherson suspension, the cross-axis unequal-speed steering knuckle, the double-type, the bump-type, the tripod-type quasi-constant-speed steering knuckle, or the ball-fork type, the ball-cage type constant-speed steering knuckle, in addition to the different positions of the through holes at the connection between the different steering knuckles and the suspension, their shapes are also different. For this reason, the working platform divides the space in the body into a first space located at the upper part and a second space located at the lower part, the positioning part and the tightening mechanism are installed in the first space, and a support member for supporting the second branch is installed in the second space. The working platform is provided with a hollow portion that can connect the first space and the second space, and the second branch of the steering knuckle to be processed can extend into the second space with the help of the hollow portion, so that the support member supports the second branch, wherein the second branch is used to connect with the lower control arm, and is arranged on the opposite side of the first branch with the wheel center as the boundary. The steering knuckle to be processed, especially the steering knuckle for McPherson suspension, has a second branch in the shape of an elongated arc. When placed, the through hole is placed upward so that the second branch at the bottom supports the steering knuckle to be processed. The working platform places the second branch on the support through the hollow part, so that the steering knuckle to be processed can be stably placed in the tightening machine for processing.

[0011] In order to optimize the space layout of the tightening machine, preferably, the machine body is provided with material boxes for placing materials on the left and right sides of the periphery of the hollow part. The material box can place materials such as nuts, which can not only optimize the space layout of the tightening machine, but also effectively improve the installation efficiency of the staff. For example, the material box on the left can be used to place nuts suitable for installation of the left steering knuckle or installation accessories required for steering knuckles of different forms, and the material box on the right can be used to place nuts suitable for installation of the right steering knuckle or installation accessories required for steering knuckles of different forms.

[0012] In order to enable the tightening machine to clamp the left steering knuckle or the right steering knuckle, preferably, the machine body is also provided with a clamping mechanism for clamping the steering knuckle to be processed, and the clamping mechanism includes a first clamping part and a second clamping part for clamping the third branch, and the first clamping part and the second clamping part are respectively located on the left and right sides of the positioning part. When the left steering knuckle and the right steering knuckle are selectively placed on the positioning part, the first clamping part or the second clamping part can clamp the corresponding third branch, wherein the third branch is rotationally connected to other control arms. The first clamping part and the second clamping part are respectively provided on the left and right sides of the positioning part, so that when the left steering knuckle or the right steering knuckle is selectively selected, the machine body can also position the steering knuckle to be processed, so that the tightening machine can clamp the left steering knuckle or the right steering knuckle, so that the tightening machine has a wider range of application.

[0013] In order to make the positioning part and the clamping mechanism cooperate better, preferably, the machine body is also provided with a positioning plate which is gradually outward from top to bottom, and the positioning part, the first clamping part and the second clamping part are all arranged on the positioning plate. The positioning part is a column which can pass through the wheel center. The positioning part pre-positions the steering knuckle to be processed on the positioning plate by cooperating with the wheel center, and then clamps the corresponding third branch by the first clamping part or the second clamping part, so as to complete the positioning of the steering knuckle to be processed in the machine body. The positioning plate which is gradually outward from top to bottom can better match the shape of the steering knuckle to be processed, so that the through hole of the steering knuckle to be processed is positioned upward on the positioning part. Through the cooperation of the positioning part and the wheel center, the steering knuckle to be processed is first pre-positioned on the positioning plate, and then the positioning of the steering knuckle to be processed is completed by the first clamping part or the second clamping part.

[0014] In order to enable the first clamping part and the second clamping part to clamp the third branch more stably, preferably, the positioning plate is provided with a left positioning column corresponding to the third branch of the left steering knuckle and a right positioning column corresponding to the third branch of the right steering knuckle, the left positioning column cooperates with the first clamping part to clamp the third branch of the left steering knuckle, and the right positioning column cooperates with the second clamping part to clamp the third branch of the right steering knuckle. The left positioning column can abut against the third branch of the left steering knuckle, and the right positioning column can abut against the third branch of the right steering knuckle, and then the third branch is clamped through the cooperation of the first clamping part or the second clamping part.

[0015] In order to prevent the steering knuckle to be processed from moving on the positioning plate, preferably, the positioning plate is further provided with a left limiting post and a right limiting post capable of limiting the upward movement of the third branch, the left limiting post being arranged above the left positioning post, and the right limiting post being arranged above the right positioning post. The left limiting post and the right limiting post are arranged at the connection between the respective corresponding third branch and the main body of the steering knuckle to be processed, limiting the upward movement of the third branch, thereby preventing the steering knuckle to be processed from moving.

[0016] In order to position the first branch more stably, preferably, the clamping mechanism further includes a third clamping part and a fourth clamping part for clamping the first branch, the third clamping part and the fourth clamping part are symmetrically arranged at the upper end of the positioning plate, and the positioning plate is also provided with a first positioning column corresponding to the third clamping part and a second positioning column corresponding to the fourth clamping part, the third clamping part cooperates with the first positioning column to clamp the first branch of the right steering knuckle, and the fourth clamping part cooperates with the second positioning column to clamp the first branch of the left steering knuckle. The positions of the first branches of the left steering knuckle and the right steering knuckle are different, that is, the first branch of the left steering knuckle is biased to the right, and the first branch of the right steering knuckle is biased to the left, therefore, the third clamping part cooperates with the first positioning column to clamp the first branch of the right steering knuckle, and the fourth clamping part cooperates with the second positioning column to clamp the first branch of the left steering knuckle, so that the first branches of the left steering knuckle and the right steering knuckle can be positioned on the positioning plate, avoiding the first branch from shaking when the nut is tightened at the through hole.

[0017] In order to enable the clamping mechanism to clamp the third branch or the first branch, preferably, the first clamping part, the second clamping part, the third clamping part and the fourth clamping part of the clamping mechanism all include a cylinder arranged perpendicular to the positioning plate and a clamping member rotatably connected to the output end of each corresponding cylinder, the clamping member can be rotated to the third branch or the first branch of the steering knuckle to be processed, and the cylinder can drive the clamping member to clamp the third branch or the first branch. The clamping member is manually rotated to align the clamping member with the third branch or the first branch, and then the clamping member is driven by the cylinder to clamp the third branch or the first branch, so that the first clamping part and the second clamping part can clamp the corresponding third branch, and the third clamping part and the fourth clamping part can clamp the corresponding first branch.

[0018] In order to detect whether the steering knuckle to be processed is placed at the target position, preferably, at least two position sensors are provided on the positioning plate, each of which is used to detect whether the steering knuckle to be processed is placed at the target position on the positioning plate. After the position sensor detects that the steering knuckle to be processed is placed at the target position, the tightening mechanism starts to tighten the nut.

[0019] Compared with the prior art, the advantages of the utility model are:

[0020] 1. The moving path of the tightening gun of the tightening mechanism is specifically adjusted from the existing single vertical direction to the vertical direction and horizontal direction at the same time, which can not only process different steering knuckles, but also process the left and right models of the same steering knuckle, effectively increasing the processing range;

[0021] 2. Since there is a wheel center on the steering knuckle, a positioning part that can locate the wheel center of the steering knuckle is provided on the body of the tightening machine. It can not only position the left and right models of the same steering knuckle, but also place the through hole of the steering knuckle upward, which is convenient for the tightening mechanism to align with the through hole position to tighten the nut, thereby improving the working efficiency of the tightening machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the left steering knuckle in the background technology of the utility model;

[0023] Figure 2 It is a structural schematic diagram of the right steering knuckle in the background technology of the utility model;

[0024] Figure 3 It is a schematic diagram of the structure of an embodiment of the utility model;

[0025] Figure 4 It is a partial schematic diagram of the processing of the left steering knuckle in the embodiment of the utility model;

[0026] Figure 5 It is a partial schematic diagram of the processing of the right steering knuckle in the embodiment of the utility model;

[0027] Figure 6 It is a structural schematic diagram of the positioning part and the clamping mechanism in the embodiment of the utility model;

[0028] Figure 7 It is a structural schematic diagram of the tightening mechanism in the embodiment of the utility model. DETAILED DESCRIPTION

[0029] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0030] like Figures 3 to 7 Shown is the best embodiment of the utility model.

[0031] The tightening machine of the present embodiment is used for tightening nuts on steering knuckles, wherein the steering knuckle 7 to be processed comprises a wheel center 71 located at the center, a first branch 72 located at the top for connecting with the suspension of the vehicle body, a second branch 73 located at the bottom for connecting with the lower control arm, and a third branch 74 located at one side for rotational connection with other control arms, the first branch 72 is provided with a through hole 721 capable of installing a nut 8, the second branch 72 is arranged on the opposite side of the first branch 72 with the wheel center as the boundary, the steering knuckle 7 to be processed is divided into a left steering knuckle 7a and a right steering knuckle 7b, the third branch 74 of the left steering knuckle 7a is located on the left side, the first branch 72 of the left steering knuckle 7a is located on the right side, the third branch 74 of the right steering knuckle 7b is located on the right side, the first branch 72 of the right steering knuckle 7b is located on the left side, and the left steering knuckle 7a is installed on the tightening machine of the present embodiment for processing, as shown in FIG. Figure 4As shown, the right steering knuckle 7b is mounted on the tightening machine of this embodiment for processing, as shown in FIG. Figure 5 shown.

[0032] like Figure 3 As shown, the tightening machine of this embodiment includes a body 1, in which a working platform 2 for processing a steering knuckle 7 to be processed, a positioning portion 31 for positioning a wheel center 71 of the steering knuckle 7 to be processed, and a tightening mechanism 4 for tightening a nut 8 are provided. The positioning portion 31 is so that the through hole 721 of the steering knuckle 7 to be processed is placed upwards, and the working platform 2 divides the space in the body 1 into a first space 11 located at the upper part and a second space 12 located at the lower part. The positioning portion 31 and the tightening mechanism 4 are installed in the first space 11, and the tightening mechanism 4 is located above the positioning portion 31. A support member 5 for supporting the second branch 73 is installed in the second space 12. A hollow portion 21 capable of connecting the first space 11 and the second space 12 is provided on the working platform 2. The second branch 73 of the steering knuckle 7 to be processed can extend into the second space 12 with the aid of the hollow portion 21, so that the support member 5 supports the second branch 73, so that the steering knuckle 7 to be processed is more stably placed in the tightening machine for processing. In addition, the machine body 1 is provided with material boxes 9 for placing materials on the left and right sides of the periphery of the hollow portion 21 .

[0033] like Figures 4 to 6As shown, the body of this embodiment is further provided with a positioning plate 34 which is gradually extended outward from top to bottom. The positioning plate 34 is provided with a positioning portion 31 for positioning the wheel center 71 and a clamping mechanism for clamping the steering knuckle 7 to be processed. The positioning portion 31 is a column that can pass through the wheel center 71. The positioning portion 31 pre-positions the steering knuckle 7 to be processed on the positioning plate 34 by cooperating with the wheel center 71. The clamping mechanism includes a first clamping portion 32 and a second clamping portion 33 for clamping the third branch 74, and a third clamping portion 37 and a fourth clamping portion 38 for clamping the first branch 72. The clamping portion 38, the first clamping portion 32 and the second clamping portion 33 are respectively located on the left and right sides of the positioning portion 31, and the third clamping portion 37 and the fourth clamping portion 38 are symmetrically arranged at the upper end of the positioning plate 34. When the left steering knuckle 7a and the right steering knuckle 7b are selectively placed on the positioning portion 31, the first clamping portion 32 or the second clamping portion 33 can clamp the corresponding third branch 74, and the third clamping portion 37 or the fourth clamping portion 38 can clamp the corresponding first branch 72, thereby completing the positioning of the steering knuckle 7 to be processed in the machine body 1. In addition, a left positioning column 341 corresponding to the third branch 74 of the left steering knuckle 7a and a right positioning column 342 corresponding to the third branch 74 of the right steering knuckle 7b are provided on the positioning plate 34. The left positioning column 341 cooperates with the first clamping portion 32 to clamp the third branch 74 of the left steering knuckle 7a, and the right positioning column 342 cooperates with the second clamping portion 33 to clamp the third branch 74 of the right steering knuckle 7b; and a first positioning column 343 corresponding to the third clamping portion 37 and a second positioning column 344 corresponding to the fourth clamping portion 38 are also provided on the positioning plate 34. The third clamping portion 37 cooperates with the first positioning column 343 to clamp the first branch 72 of the right steering knuckle 7b, and the fourth clamping portion 38 cooperates with the second positioning column 344 to clamp the first branch 72 of the left steering knuckle 7a. In order to prevent the steering knuckle 7 to be processed from moving upward, the positioning plate 34 is also provided with a left limit column 35 and a right limit column 36 that can limit the upward movement of the third branch 74. The left limit column 35 is arranged above the left positioning column 341, and the right limit column 36 is arranged above the right positioning column 342. The left limit column 35 and the right limit column 36 are arranged at the connection between the respective corresponding third branch 74 and the main body of the steering knuckle 7 to be processed, which limits the upward movement of the third branch 74, thereby preventing the steering knuckle 7 to be processed from moving.

[0034] In addition, a plurality of position sensors 6 are provided on the positioning plate 34 in this embodiment, and each position sensor 6 is used to detect whether the steering knuckle 7 to be processed is placed at the target position on the positioning plate 34. When the position sensor 6 detects that the steering knuckle 7 to be processed is placed at the target position, the tightening mechanism 4 of the tightening machine starts to tighten the nut 8.

[0035] like Figure 6As shown, the first clamping part 32, the second clamping part 33, the third clamping part 37 and the fourth clamping part 38 in this embodiment all include a cylinder 3a arranged perpendicular to the positioning plate 34 and a clamping piece 3b rotatably connected to the output end of each corresponding cylinder 3a. The clamping piece 3b of the first clamping part 32 can be rotated to a position corresponding to the left positioning column 341, and the clamping piece 3b of the second clamping part 33 can be rotated to a position corresponding to the right positioning column 342. The cylinder 3a can drive the clamping piece 3b to clamp the third branch 74; the clamping piece 3b of the third clamping part 37 can be rotated to a position corresponding to the first positioning column 341. The clamping member 3b of the fourth clamping part 38 can be rotated to the position corresponding to the second positioning column 343, and the cylinder 3a can drive the clamping member 3b to clamp the first branch 72; by manually rotating the clamping member 3b, the clamping member 3b is aligned with the first branch 72 or the third branch 74, and then the cylinder 3a drives the clamping member 3b to clamp the first branch 72 or the third branch 74, so that the first clamping part 32 and the second clamping part 33 can clamp the corresponding third branch 74, and the third clamping part 37 and the fourth clamping part 38 can clamp the corresponding first branch 72.

[0036] like Figure 7 As shown, the tightening mechanism 4 of this embodiment is used to tighten the nut 8 on the through hole 721 of the left steering knuckle 7a or the right steering knuckle 7b to be processed. The tightening mechanism 4 includes a tightening gun 41 for tightening the nut 8, a first moving mechanism 42 that drives the tightening gun 41 to move up and down, and a second moving mechanism 43 that drives the tightening gun 41 to move left and right. The second moving mechanism 43 drives the tightening gun 41 to move left and right to align with the through hole 721 on the first branch 72 of the left steering knuckle 7a or the through hole 721 on the first branch 72 of the right steering knuckle 7b, and the first moving mechanism 42 drives the tightening gun 41 to move up and down to enable the tightening gun 41 to tighten the nut.

[0037] The working process of this embodiment taking the left steering knuckle 7a as an example is as follows:

[0038] A. The positioning portion 31 is passed through the wheel center 71 of the left steering knuckle 7a, and the second branch portion 73 of the left steering knuckle 7a passes through the hollow portion 21 and extends into the second space 12. The support member 5 supports the second branch portion 73, thereby completing the pre-positioning of the left steering knuckle 7a. At this time, the left positioning column 341 abuts against the third branch portion 74 of the left steering knuckle 7a, the first positioning column 343 abuts against the first branch portion 72 of the left steering knuckle 7a, and the left limiting column 35 is at the connection between the third branch portion 74 of the left steering knuckle 7a and the main body of the left steering knuckle 7a, limiting the upward movement of the third branch portion 74 of the left steering knuckle 7a.

[0039] B. Then, the clamping piece 3b of the first clamping part 32 rotates to a state aligned with the third branch 74 of the left steering knuckle 7a, that is, aligned with the left positioning column 341. Driven by the cylinder 3a of the first clamping part 32, the clamping piece 3b of the first clamping part 32 moves and cooperates with the left positioning column 341, thereby pressing the third branch 74 of the left steering knuckle 7a; at the same time, the clamping piece 3b of the fourth clamping part 38 rotates to a state aligned with the first branch 72 of the left steering knuckle 7a, that is, aligned with the second positioning column 344. Driven by the cylinder 3a of the fourth clamping part 38, the clamping piece 3b of the fourth clamping part 38 moves and cooperates with the second positioning column 344, thereby pressing the first branch 72 of the left steering knuckle 7a;

[0040] C. Finally, the tightening gun 41 is driven by the second moving mechanism 43 to move rightward to align with the through hole 721 of the first branch 72, and then the first moving mechanism 42 drives the tightening gun 41 to move downward to connect with the nut 8, and the tightening gun 41 rotates to tighten the nut 8, thereby completing the processing of the left steering knuckle 7a.

Claims

1. A tightening machine for a steering knuckle, comprising a machine body (1), wherein a working platform (2) for machining a steering knuckle (7) to be machined is arranged in the machine body (1), wherein: The steering knuckle (7) to be processed comprises a wheel center (71) located at the center, a first branch (72) located at the top for connecting with the suspension of the vehicle body, the first branch (72) being provided with a through hole (721) capable of installing a nut (8), the steering knuckle (7) to be processed is divided into a left steering knuckle (7a) and a right steering knuckle (7b), the first branch (72) of the left steering knuckle (7a) being located on the right side, and the first branch (72) of the right steering knuckle (7b) being located on the left side; The feature is that: the machine body (1) is also provided with: A positioning portion (31) for positioning the wheel center (71) of the steering knuckle (7) to be processed so that the through hole (721) for the steering knuckle (7) to be processed is placed upward; A tightening mechanism (4) is located on the positioning portion (31) and is used to tighten a nut (8) on a through hole (721) of a left steering knuckle (7a) or a right steering knuckle (7b) to be processed; the tightening mechanism (4) comprises a tightening gun (41) for tightening the nut (8), a first moving mechanism (42) for driving the tightening gun (41) to move up and down, and a second moving mechanism (43) for driving the tightening gun (41) to move left and right, the second moving mechanism (43) driving the tightening gun (41) to move left and right to achieve alignment with the through hole (721) on the first branch (72) of the left steering knuckle (7a) or the through hole (721) on the first branch (72) of the right steering knuckle (7b), and the first moving mechanism (42) driving the tightening gun (41) to move up and down to achieve the tightening of the nut by the tightening gun (41).

2. The tightening machine according to claim 1, characterized in that: The working platform (2) divides the space in the machine body (1) into a first space (11) located at the top and a second space (12) located at the bottom. The positioning portion (31) and the tightening mechanism (4) are installed in the first space (11). A support member (5) for supporting the second branch (73) is installed in the second space (12). The working platform (2) is provided with a hollow portion (21) capable of connecting the first space (11) and the second space (12). The second branch (73) of the steering knuckle (7) to be processed can extend into the second space (12) by means of the hollow portion (21), so that the support member (5) supports the second branch (73). The second branch (73) is used to connect with the lower control arm and is arranged on the opposite side of the first branch (72) with the wheel center (71) as the boundary.

3. The tightening machine according to claim 2, characterized in that: The machine body (1) is provided with material boxes (9) for placing materials on the left and right sides of the periphery of the hollow portion (21).

4. The tightening machine according to any one of claims 1 to 3, characterized in that: The machine body (1) is also provided with a clamping mechanism for clamping the steering knuckle (7) to be processed, the clamping mechanism comprising a first clamping portion (32) and a second clamping portion (33) for clamping the third branch (74), the first clamping portion (32) and the second clamping portion (33) being respectively located on the left and right sides of the positioning portion (31), and when the left steering knuckle (7a) and the right steering knuckle (7b) are selectively placed on the positioning portion (31), the first clamping portion (32) or the second clamping portion (33) can clamp the corresponding third branch (74), wherein the third branch (74) is rotatably connected to other control arms.

5. The tightening machine according to claim 4, characterized in that: The machine body (1) is also provided with a positioning plate (34) which gradually extends outward from top to bottom. The positioning portion (31), the first clamping portion (32) and the second clamping portion (33) are all arranged on the positioning plate (34). The positioning portion (31) is a column capable of passing through the wheel center (71). The positioning portion (31) pre-positions the steering knuckle (7) to be processed on the positioning plate (34) by cooperating with the wheel center (71), and then clamps the corresponding third branch (74) by the first clamping portion (32) or the second clamping portion (33), thereby completing the positioning of the steering knuckle (7) to be processed in the machine body (1).

6. The tightening machine according to claim 5, characterized in that: The positioning plate (34) is provided with a left positioning column (341) corresponding to the third branch (74) of the left steering knuckle (7a) and a right positioning column (342) corresponding to the third branch (74) of the right steering knuckle (7b); the left positioning column (341) cooperates with the first clamping portion (32) to clamp the third branch (74) of the left steering knuckle (7a); and the right positioning column (342) cooperates with the second clamping portion (33) to clamp the third branch (74) of the right steering knuckle (7b).

7. The tightening machine according to claim 6, characterized in that: The positioning plate (34) is also provided with a left limiting column (35) and a right limiting column (36) capable of limiting the upward movement of the third branch (74); the left limiting column (35) is arranged above the left positioning column (341), and the right limiting column (36) is arranged above the right positioning column (342).

8. The tightening machine according to claim 5, characterized in that: The clamping mechanism also includes a third clamping portion (37) and a fourth clamping portion (38) for clamping the first branch portion (72); the third clamping portion (37) and the fourth clamping portion (38) are symmetrically arranged at the upper end of the positioning plate (34); the positioning plate (34) is also provided with a first positioning column (343) corresponding to the third clamping portion (37) and a second positioning column (344) corresponding to the fourth clamping portion (38); the third clamping portion (37) cooperates with the first positioning column (343) to clamp the first branch portion (72) of the right steering knuckle (7b); the fourth clamping portion (38) cooperates with the second positioning column (344) to clamp the first branch portion (72) of the left steering knuckle (7a).

9. The tightening machine according to claim 8, characterized in that: The first clamping part (32), the second clamping part (33), the third clamping part (37) and the fourth clamping part (38) of the clamping mechanism each include a cylinder (3a) arranged perpendicular to the positioning plate (34) and a clamping member (3b) rotatably connected to the output end of each corresponding cylinder (3a); the clamping member (3b) can be rotated to the third branch (74) or the first branch (72) of the steering knuckle (7) to be processed, and the cylinder (3a) can drive the clamping member (3b) to clamp the third branch (74) or the first branch (72).

10. The tightening machine according to claim 5, characterized in that: At least two position sensors (6) are provided on the positioning plate (34), and each of the position sensors (6) is used to detect whether the steering knuckle (7) to be processed is placed at a target position on the positioning plate (34).

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