jib, jigger

Abstract

The application discloses a supporting arm and a car jacking machine with the same, and the supporting arm comprises an arm body and a movable body capable of lifting; the arm body can penetrate through the movable body; wherein the arm body is connected with connecting bodies on both sides through moving pairs respectively, the lower part of the connecting body on the end of the arm body away from the car body is connected with the arm body through a first screw pair, and the two connecting bodies are hinged with the movable body through shafts, so that the arm body is carried in a cantilever form, the first screw pair rotates, the arm body moves horizontally inside the movable body and between two hinge points, the two moving pairs can always keep sliding in parallel, and the movement frictional resistance is effectively reduced through the moving pairs and the screw pair and the connecting form of the arm body and the movable body, so that the car body can be accurately adjusted in a large range in a transverse direction with a smaller driving force, and the accurate alignment of the car body and the bogie is accurately completed.

Description

Technical Field

[0001] This invention relates to the field of vehicle jacking technology, and more particularly to a support arm and a vehicle jack having the support arm. Background Technology

[0002] With the development and changes in railway passenger car technology and structure, it is required that the jacking machine can achieve precise lateral adjustment of the vehicle while jacking it. The traditional jacking machine uses a manual gear and rack device for arm extension and retraction, and a hydraulic translation device for translation and fine adjustment. Although it can achieve a certain degree of technical upgrade, the following defects still exist.

[0003] The telescopic mechanism of the car jack's support arm is cumbersome to operate manually using a rack and pinion, and safety locking and positioning must be achieved by inserting and removing safety pins. Since the safety pin holes cannot be arranged very densely, the telescopic positioning of the support arm is extremely inaccurate. The translation and fine-tuning device uses a hydraulically driven sliding plate mode. The sliding plate carries the vehicle, resulting in high friction and inertia, which leads to extremely poor lateral fine-tuning accuracy. Moreover, because the structure and power of the support arm telescopic and fine-tuning are separated, the support arm design is too wide and too long, resulting in a large bending moment on the car jack's column, poor safety, cumbersome operation, and an inability to achieve large-range lateral precise adjustment of the car body when changing tracks.

[0004] Therefore, in view of the above problems, it is necessary for the present invention to provide a support arm with high lateral adjustment accuracy for the upper body of a rail vehicle and a car lifting machine having the support arm. Summary of the Invention

[0005] The purpose of this invention is to overcome the defects of the prior art and provide a support arm and a car lifting machine with the support arm, so as to solve the problem that the fine adjustment and extension of the support arm of the car lifting machine adopts a separate structure and power drive mode, resulting in low lateral adjustment accuracy of the support arm;

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] The support arm disclosed in this invention includes:

[0008] The arm itself and the movable body capable of lifting and lowering;

[0009] The arm body can penetrate the movable body;

[0010] The arm body has connecting bodies on both sides via sliding joints. The lower part of the connecting body away from the vehicle body is connected to the arm body via a first helical joint. Both connecting bodies are hinged to the movable body via shafts, so that the arm body can be cantilevered, the first helical joint can rotate, the arm body moves laterally inside the movable body between the two hinge points, and the two sliding joints can always slide in parallel.

[0011] Furthermore, the two connecting bodies are stacked on the upper and lower parts of the arm body, respectively, and are fulcrumd around the axis, so that the two connecting bodies and the arm body are simultaneously subjected to pressure.

[0012] Furthermore, in the extended state of the arm body, the extended length is the sum of the length of the arm body and the length of one of the connecting bodies.

[0013] Furthermore, the arm body includes two spaced-apart uprights, the upper and lower parts of which are fixedly connected to the sliding joint.

[0014] Furthermore, the connector includes a first mounting plate, a second mounting plate, and a connecting plate connecting the first mounting plate and the second mounting plate;

[0015] The connecting plate has a shaft hole for connecting with the shaft to form a fulcrum;

[0016] The first mounting plate is connected to the arm body via the sliding joint;

[0017] The first helical pair is connected between the second mounting plate and the first mounting plate, and the second mounting plate is fixedly connected to a driver to provide driving force for the rotation of the helical pair, thereby driving the arm body to reciprocate.

[0018] Furthermore, the connecting body is constructed as an ear plate, the upper part of which is connected to the arm body via the sliding joint, and the ear plate has a shaft hole for connecting with the shaft to form a fulcrum.

[0019] Furthermore, the movable body includes two irregularly shaped plates and at least two support shafts. The surface of the irregularly shaped plates is formed with a virtual quadrilateral. The support shafts are provided at both ends of the diagonal of the virtual quadrilateral extending obliquely upward from the side of the vehicle body to support the two irregularly shaped plates to form an inner cavity.

[0020] Furthermore, each end of the support shaft is rotatably connected to a first roller for rolling contact with the car-lifting machine, and the connecting body and the first rollers share the support shaft.

[0021] Furthermore, the two irregularly shaped plates are each connected to a second roller via a shaft at both ends of the diagonal line extending downwards from the side of the vehicle body of the virtual quadrilateral, for rolling contact with the vehicle mounting machine.

[0022] Furthermore, the movable body is located between the two connecting bodies and connected to the vehicle lifting machine through a second helical pair. The movable body is driven to rise and fall by the second helical pair. The second helical pair passes through the arm body. The arm body has a clearance cavity along its length to avoid the second helical pair.

[0023] In the above technical solution, the support arm provided by the present invention has connecting bodies on both sides of the arm body through sliding joints, and the connecting body at the tail end of the arm body is connected to the arm body through a screw joint. The sliding joint cooperates with the screw joint to effectively combine driving and movement. Both connecting bodies are hinged to the movable body through shafts. In the working state, the arm body is supported in a cantilever form. When the screw joint rotates, the arm body moves laterally between two hinge points inside the movable body. The two sliding joints are pressed synchronously and can always slide in parallel, reducing the frictional resistance of the movement. With a small driving force, the vehicle body can be adjusted laterally over a large range, and the precise alignment of the vehicle body and the bogie can be completed.

[0024] The vehicle-lifting machine disclosed in this invention includes a column and the aforementioned support arm mounted on the column.

[0025] Since the vehicle frame has the aforementioned support arm, it has the same beneficial effects as the support arm, which will not be elaborated here. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0027] Figure 1 This is a schematic diagram of the vehicle jacking machine in use (with the support arm extended) as disclosed in this invention.

[0028] Figure 2 This is a schematic diagram of the overall structure of the vehicle-lifting machine disclosed in this invention (with the support arm retracted).

[0029] Figure 3 This is a schematic diagram of the support arm structure disclosed in this invention;

[0030] Figure 4 yes Figure 3 Left view;

[0031] Figure 5 This is a schematic diagram of the telescopic principle of the support arm disclosed in this invention;

[0032] Figure 6 This is a schematic diagram of the arm body structure of the support arm disclosed in this invention;

[0033] Figure 7 yes Figure 6 Left view;

[0034] Figure 8 This is a schematic diagram of the connecting structure of the support arm disclosed in this invention;

[0035] Figure 9 yes Figure 8 Top view;

[0036] Figure 10 This is a schematic diagram of the movable structure of the support arm disclosed in this invention;

[0037] Figure 11 yes Figure 10 AA section view;

[0038] Figure 12 yes Figure 10 BB cross-sectional view.

[0039] Explanation of reference numerals in the attached figures:

[0040] Arm body 100;

[0041] 110 upright plate; 111 mounting base; 112 clearance cavity; 113 support block;

[0042] Connector 120; First mounting plate 121; Second mounting plate 122; Connecting plate 123; Shaft hole 124;

[0043] Connector 130; Shaft hole 131;

[0044] 140; 141; 142;

[0045] First helical pair 150; Lead screw 151; Nut 152;

[0046] Driver 160; Gear 161;

[0047] Pivot point 170;

[0048] Movable body 200; irregular plate 210; shaft 211; support shaft 212; short shaft 213; first roller 220; second roller 230; second screw pair 240; lead screw 241; lead nut 242; virtual quadrilateral 250;

[0049] Column 300;

[0050] Motor 310. Detailed Implementation

[0051] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0052] Figure 1 A schematic diagram showing the extended state of the support arm when the car-lifting machine is in use;

[0053] Figure 2 A schematic diagram of the overall structure of the car-lifting machine, showing the support arm in its retracted state;

[0054] The invention provides a support arm suitable for lifting machines that lift rail vehicles. When in use, four sets are used as a group, with two on each side of the vehicle, symmetrically distributed along the axis of the vehicle's length. Of course, the support arm can also be used for automobiles or other working conditions where objects need to be lifted to a certain height and then adjusted horizontally. This embodiment is only an example of lifting rail vehicles.

[0055] Figure 3 Schematic diagram of the support arm structure;

[0056] The support arm includes: an arm body 100 and a movable body 200;

[0057] The arm body 100 is used to support the vehicle body, and the movable body 200 can be raised and lowered along the car-lifting machine column 300. During assembly, the arm body 100 passes through the movable body 200 and uses the movable body 200 to drive its raising and lowering.

[0058] Among them, the two sides of the arm body 100 are respectively connected to the connecting body 120 and the connecting body 130 through the sliding joint 140. The connecting body 120 is located at the end of the arm body 100 away from the vehicle body. The lower part of the connecting body 120 is connected to the arm body 100 through the first helical joint 150. Both the connecting body 120 and the connecting body 130 are hinged to the movable body 200 through the shaft. The two hinge points are also the two fulcrum points 170.

[0059] In working condition, such as Figure 1 As shown, the arm body 100 is supported in a cantilever form, and the first helical joint 150 rotates. The first helical joint 150 drives the arm body 100 to move laterally inside the movable body 200 and between two hinge points. The two sliding joints 140 can always slide in parallel, thereby minimizing friction and improving the lateral adjustment accuracy of the arm.

[0060] See Figure 3 , 4 As shown, specifically, the arm body 100 is constructed as a columnar structure with a quadrilateral cross-section. In use, it is horizontally positioned. The first end of the arm body 100 is fixedly connected to a support block 113, which connects it to the vehicle body. The tail end of the arm body 100 is connected to a first helical joint 150. The upper surface of the arm body 100 is connected to a connecting body 120 via a sliding joint 140, and the lower surface is connected to a connecting body 130 via a sliding joint 140. Preferably, the sliding joint 140 is a combination of a precision guide rail 141 and a slider 142 in the prior art, which enables the arm body 100 to slide relative to the two connecting bodies. In this structure, the arm body 100 adopts the upper and lower sliding joint 140 guiding and positioning mode to reduce the frictional resistance of the movement, and achieve a large range of precise lateral adjustment and rotation of the vehicle body with a small driving force, so as to accurately complete the precise alignment of the vehicle body and the bogie.

[0061] See Figure 4As shown, in the specific structure, precision linear guide rails 141 are fixedly connected to both the upper and lower parts of the arm body 100 along the length direction. Slider blocks 142 are fixedly connected to both the connecting body 120 and the connecting body 130. The connecting body 120 is located at the end of the arm body 100 away from the vehicle body, and its lower part is connected to the arm body 100 via a first helical pair 150. The first helical pair 150 includes a lead screw 151 rotatably connected to the connecting body 120 and a nut 152 fixedly connected to the tail end of the arm body 100. The lead screw 151 and the nut 152 provide helical transmission.

[0062] See Figure 2 As shown, the movable body 200 is connected to the car-lifting machine and can be raised and lowered along the car-lifting machine column 300. The movable body 200 is constructed with an inner cavity, through which the arm body 100 can pass through the movable body 200. The upper part of the arm body 100 is connected to the movable body 200 by a connecting body 120 through a shaft 211, and the lower part of the arm body 100 is connected to the movable body 200 by a second connecting body 130 through a shaft. Two fulcrums 170 are formed at the junction. The two fulcrums 170 are arranged in a front-to-back manner, that is, the two fulcrums 170 are not on the same vertical axis 211.

[0063] See Figure 2 As shown, in the folded state, the connecting body 130 is located below the support block 113, and the arm body 100 is shortened to its maximum extent, so that the front end of the arm body 100 is close to the gantry crane column 300. See [reference needed]. Figure 1 As shown, when in the extended state, the tail end of the boom body 100 is close to the car-mounting machine column 300, so that the boom body 100 is fully extended and the effective length is reasonably utilized.

[0064] Figure 5 This is a schematic diagram of the telescopic arm principle.

[0065] During operation, the arm body 100 cantileveredly supports the vehicle body. The first helical joint 150 rotates, driving the arm body 100 to extend and retract relative to the two connecting bodies. At this time, the sliding joint 140 between the connecting body 120 and the arm body 100, as well as between the arm body 100 and the connecting body 130, is simultaneously under pressure. Since the two connecting bodies are hinged to the movable body 200 at two fulcrums 170, the upper and lower sliding joints 140 are simultaneously under pressure. Precision guide rails 141 are used to coordinate with the sliding joints 140, such as... Figure 5 As shown, the upper and lower moving parts 140 form two sets of spatial parallel lines that rotate synchronously around the pivot point 170 as the rotation center. The two lines are always parallel throughout the rotation, which minimizes friction and effectively improves the accuracy of lateral movement adjustment. In addition, the upper and lower support points of the arm body 100 are hinged, and each component can obtain good processing and installation technology.

[0066] Compared with the existing technology where the structure and power drive of the fine adjustment and telescopic functions are separate, this support arm structure integrates the telescopic and fine adjustment power into one, reducing the distance between the jacking machine column 300 and the vehicle body, maximizing the improvement of the stress state of the column 300, and reducing the cross-sectional dimensions of the steel structure of the jacking machine column 300 and the length and width of the support arm.

[0067] In addition, the use of a vertical moving pair for guidance and positioning, combined with an electric drive mode for the helical pair, replaces the hydraulic sliding mode, ultimately achieving a wide range of track-changing translation of the car body and precise alignment of the car body and the bogie.

[0068] Figure 6 This is a schematic diagram of the arm body structure of the support arm;

[0069] In a preferred embodiment, the connectors 120 and 130 are stacked on the upper and lower parts of the arm body 100, resulting in a compact structure that reduces the distance between the column 300 and the vehicle body, maximizes the improvement of the stress state of the column 300, and reduces the cross-sectional dimensions of the steel structure of the jacking machine column 300.

[0070] When the arm body 100 is in the retracted state, the sum of the lengths of the two connecting bodies and the arm body 100 is no greater than the length of the arm body 100. At this time, the connecting body 130 is stacked under the support block 113, and the connecting body 120 is stacked at the tail end of the arm body 100, so as to shorten the overall length of the support arm to the maximum extent.

[0071] When the arm body 100 is extended, the extension length of the support arm is the sum of the length of the arm body 100 and the length of the connecting body 120. The arm body 100 is always laterally displaced between the two fulcrums 170. The effective length of the arm body 100 is fully extended and utilized. The connecting body 120 is placed behind the movable body 200, and the connecting body 130 is located in front of the movable body 200. The two fulcrums 170 are compressed one in front and one behind, and the structure is stable.

[0072] See Figure 6 As shown, in a preferred embodiment, the arm body 100 includes two spaced-apart upright plates 110. A mounting base 111 is fixedly connected to the front end of each upright plate 110, and a nut 152 of a first helical pair 150 is fixedly connected to the rear end of each upright plate 110. The two upright plates 110, the mounting base 111, and the nut 152 together form the arm body 100. The arm body 100 is open on both sides of the upright plates 110, thus forming a clearance cavity 112 between the mounting base 111 and the nut 152 to avoid mechanical interference with other components. Sliding pairs 140 are fixedly connected to both the upper and lower parts of the upright plates 110. (See also...) Figure 7 As shown, the two vertical plates 110 are fixedly connected to the precision guide rails 141 of the sliding pair 140 on all four surfaces above and below; the two sides of the arm body 100 bear the pressure through the two guide rails 141, which further improves the smoothness of the sliding of the arm body 100.

[0073] Figure 8 This is a schematic diagram of the connecting structure of the support arm;

[0074] In a preferred embodiment, the connector 120 includes a first mounting plate 121, a second mounting plate 122, and a connecting plate 123 connecting the first mounting plate 121 and the second mounting plate 122;

[0075] The first mounting plate 121 is an inverted L-shaped plate. Connecting plates 123 are fixedly connected to the upper two sides of the first mounting plate 121. The second mounting plate 122 is fixedly connected to the end of the connecting plate 123. The connecting plate 123 has a shaft hole 124 for connecting with the shaft 211 to form a fulcrum 170. The connecting plate 123 intersects with the movable body 200 at the fulcrum 170 position.

[0076] The first mounting plate 121 has sliders 142 of sliding pair 140 fixedly connected to both sides. The sliders 142 are slidably connected to the guide rail 141 on the arm body 100. The vertical section of the first mounting plate 121 and the second mounting plate 122 are rotatably connected to the lead screw 151 of the first helical pair 150.

[0077] See Figure 6 As shown, in a preferred embodiment, the connecting body 120 is provided with a driver 160 above the helical pair. The driver 160 provides driving force for the rotation of the first helical pair, driving the arm body 100 to reciprocate along the guide rail 141.

[0078] Specifically, a driver 160 is installed above the lead screw 151. The driver 160 is arranged along the length of the lead screw 151 and stacked on top of the lead screw 151 to control the length of the support arm. The end of the lead screw 151 is connected to the power output shaft of the driver 160 through gear transmission, so that the arm body 100 has its own power source. This changes the existing technology of separating the support arm structure and power source into a combined form, reducing the volume and length of the support arm, reducing the overall weight of the car lifting machine, improving the level of automation, and solving the problem that the support arm space is too wide to adapt to various car models. At the same time, it avoids the problem of large bending moment on the car lifting machine column 300 due to the excessive length of the support arm, thus solving the problem of large bending moment and poor safety of the car lifting machine column 300.

[0079] Moreover, in this structure, the drive unit 160 and the arm body 100 adopt an integrated upper-mounted power unit, and the interlocking upper and lower moving parts 140 guide the arm body 100, ensuring the precise positioning and smooth operation of the arm extension and retraction. It minimizes the length of the tow arm and the width of the space to adapt to different vehicle models. It has the function of fast advance without load and slow precise fine adjustment under load, with a fine adjustment range of ±600 mm. It can not only achieve precise fine adjustment of the vehicle, but also realize the translational change of the vehicle across multiple track gauges without the assistance of the overhead crane, eliminating the potential safety risks of overhead crane hoisting. It is currently widely used in the production and maintenance of high-speed trains and other various rail vehicles, proving that this invention can maximize the safety of personnel and equipment during the production process.

[0080] In a preferred embodiment, the driver 160 is a motor and a reducer mounted on the output shaft of the motor in the prior art. Of course, an integrated motor and reducer or a servo reducer motor can also be used. Alternatively, when the support arm is used under light load conditions, the driver 160 can also be replaced by a handwheel in the prior art, and the screw can be manually driven to rotate, which can also adjust the extension and retraction of the arm body 100.

[0081] See Figure 6 , 7 As shown, in a preferred embodiment, the connecting body 130 is constructed as an ear plate, which is a split structure. The ear plate is positioned corresponding to the guide rail 141 of the arm body 100. A slider 142 of the sliding pair 140 is fixedly connected to the upper part of the ear plate. The slider 142 is connected to the guide rail 141 on the arm body 100. The ear plate has a shaft hole 131 for connecting with a shaft to form a fulcrum 170, which intersects with the movable body 200 at the fulcrum 170 position.

[0082] Figure 10 This is a schematic diagram of the movable structure of the support arm;

[0083] In a preferred embodiment, the movable body 200 includes two irregularly shaped plates 210 and two support shafts 211. A virtual quadrilateral 250 is formed on the surface of the irregularly shaped plates 210. Support shafts 211 are provided at both ends of the diagonal extending obliquely upwards from the vehicle body side of the virtual quadrilateral 250, for supporting the two irregularly shaped plates 210 to form an inner cavity (e.g., ...). Figure 11 As shown), the arm body 100 passes through the inner cavity.

[0084] In a preferred embodiment, both ends of the support shaft 211 are rotatably connected to first rollers 220 for rolling contact with the jacking machine. The connecting body 130 and the first rollers 220 share the support shaft 211. That is, the movable body 200 is connected to the connecting body 130 through the support shaft 211. The support shaft 211 at this position is a fulcrum shaft. The two ends of the support shaft 211 are rotatably connected to the first rollers 220 on the outside of the irregular plate 210. In this structure, the movable body 200 rolls with the jacking machine through the first rollers 220. By sharing a support shaft 211 with the connecting body 130, the movable body 200 has a compact structure.

[0085] See Figure 10 , 12 As shown, in a preferred embodiment, the two irregularly shaped plates 210 are located at the two ends of the diagonal of the virtual quadrilateral 250 extending downward from the side of the vehicle body, and are rotatably connected to the second rollers 230 by a shaft for rolling contact with the vehicle jacking machine. Optionally, the shaft for mounting the second rollers 230 can be a short shaft 213 or a long shaft. In this embodiment, a short shaft is used as an example. When it is a long shaft, the long shaft passes through the two irregularly shaped plates 210 simultaneously and can also serve as a support shaft for the irregularly shaped plates 210, thereby improving the overall structural strength of the moving body 200.

[0086] In the specific structure, the diameter of the first roller 220 is larger than that of the second roller 230. The first roller 220 is used for limiting and bearing the pressure between the movable body 200 and the lifting machine column 300 when the boom lifts the vehicle. The second roller 230 works with the first roller 220 to straighten the position of the movable body 200 on the lifting machine, so that the movable body 200 can rise and fall smoothly. The friction between the movable body 200 and the lifting machine is effectively reduced by the two sets of rollers.

[0087] The specific outline shape of the irregular plate 210 can be determined based on the distribution of the two support shafts 212, the two short shafts 213, and the shafts 211 of the hinged connector 120, such as... Figure 10 As shown, this embodiment only uses a quadrilateral shape as an example. Moreover, the shaft 211 can also serve as the support shaft for the irregular plate 210, further improving the overall structural strength of the movable body 200.

[0088] See Figure 2 , 3 As shown, in a preferred embodiment, the movable body 200 is located between two connecting bodies 120 and 130 and is connected to the vehicle lifting machine through a second helical joint 240. The movable body 200 is driven to rise and fall by the second helical joint 240, which passes through the arm body 100 through the clearance cavity 112.

[0089] Specifically, the lead screw 241 of the second helical pair 240 is vertically rotatably connected to the car frame column 300, and the lead screw nut 242 of the second helical pair 240 is set in the inner cavity of the movable body 200. The two sides of the lead screw nut 242 are fixedly connected to the irregular plate 210 through fixed shafts. In this structure, the lead screw nut 242 can also be used as two support plates to support the shafts and improve the structural strength of the movable body 200.

[0090] The present invention also provides a vehicle support machine, which includes a column 300 and the aforementioned support arm. The movable body 200 of the support arm is connected to the column 300 through a second helical pair 240, and the support arm is mounted on the column 300. A motor 310 is fixedly connected to the top of the column 300 to drive the lead screw 241 to rotate, so as to achieve precise lateral adjustment while lifting.

[0091] In use, four sets of car-mounting machines work together. The individual car-mounting machines are distributed at the four corners of each car. The individual car-mounting machines drive the movable body 200 of the support arm through the second helical joint 240, which is responsible for lifting and lowering the car. The movable body 200 is articulated with the arm body 100. The arm body 100 is responsible for horizontal extension and retraction adjustment of the car through the first helical joint 150. That is to say, each car is equipped with four sets of electric telescopic support arms. When the four sets of electric telescopic support arms move in one direction at the same time, the entire car can be tracked and translated. When one pair of electric telescopic support arms moves in one direction at the same time, the car body can be rotated slightly, and finally the precise alignment of the car body and the bogie can be achieved.

[0092] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A support arm, characterized in that, include: Arm body (100) and movable body (200) capable of lifting and lowering. The arm body (100) can penetrate the movable body (200); The arm body (100) is connected to a connecting body on both sides by a sliding joint (140). The lower part of the connecting body (120) at the end of the arm body (100) away from the vehicle body is connected to the arm body (100) by a first helical joint (150). Both connecting bodies are hinged to the movable body (200) by a shaft, so that the arm body (100) can be supported in a cantilever form, the first helical joint (150) can rotate, the arm body (100) moves laterally inside the movable body (200) and between the two hinge points, and the two sliding joints (140) can always slide in parallel.

2. The driving support arm according to claim 1, characterized in that: The two connecting bodies are stacked on the upper and lower parts of the arm body (100), and are respectively supported by the axis (170) so that the two connecting bodies and the arm body (100) are synchronously compressed.

3. The support arm according to claim 2, characterized in that: When the arm body (100) is in an extended state, the extended length is the sum of the length of the arm body (100) and the length of one of the connecting bodies.

4. The support arm according to claim 1 or 2, characterized in that: The arm body (100) includes two spaced vertical plates (110), the upper and lower parts of which are fixedly connected to the sliding pair (140).

5. The support arm according to claim 4, characterized in that: The connector includes a first mounting plate (121), a second mounting plate (122), and a connecting plate (123) connecting the first mounting plate (121) and the second mounting plate (122). The connecting plate (123) has a shaft hole for connecting with the shaft to form a fulcrum (170). The first mounting plate (121) is connected to the arm body (100) via the movable joint (140); The first helical pair (150) is connected between the second mounting plate (122) and the first mounting plate (121), and the second mounting plate (122) is fixedly connected to a driver (160) to provide driving force for the rotation of the helical pair, thereby driving the arm body (100) to reciprocate.

6. The support arm according to claim 4, characterized in that: The connector is constructed as an ear plate, the upper part of which is connected to the arm body (100) via the sliding joint (140). The ear plate has a shaft hole for connecting with the shaft to form a fulcrum (170).

7. The support arm according to claim 1 or 2, characterized in that: The movable body (200) includes two irregular plates (210) and at least two support shafts (212). The surface of the irregular plates (210) is formed with a virtual quadrilateral (250). The support shafts (212) are provided at both ends of the diagonal of the virtual quadrilateral (250) extending obliquely upward from the side of the vehicle body to support the two irregular plates (210) to form an inner cavity.

8. The support arm according to claim 7, characterized in that: Both ends of the support shaft (212) are rotatably connected to first rollers (220) for rolling contact with the car-lifting machine. The connecting body and the first rollers (220) share the support shaft (212).

9. The support arm according to claim 7, characterized in that: The two irregular plates (210) are located at the two ends of the diagonal of the virtual quadrilateral (250) extending downward from the side of the vehicle body, and are rotatably connected to the second rollers (230) via shafts for rolling contact with the vehicle mounting machine.

10. The support arm according to claim 7, characterized in that: The movable body (200) is located between the two connecting bodies and connected to the vehicle lifting machine through the second helical pair (240). The movable body (200) is driven to rise and fall by the second helical pair (240). The second helical pair (240) passes through the arm body (100). The arm body (100) has a clearance cavity (112) along its length to avoid the second helical pair (240).

11. A vehicle jacking machine, characterized in that, Includes a column and a support arm as described in any one of claims 1-10 mounted on the column.

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