Patent Publication Number: US-2023159311-A1

Title: Lifting machine

Description:
TECHNICAL FIELD 
     This disclosure generally relates to the technical field of automobile maintenance, and more particularly, to a lifting machine. 
     BACKGROUND 
     A lifting machine is a machine used for facilitating automobile maintenance through lifting an automobile. Its operating principle is to propel a piston rod of an oil cylinder through a hydraulic oil cylinder arranged on the lifting machine, wherein a connecting rod system is arranged between a lifting platform and a base. Through the extending and contracting of the connecting rod system, the lifting and lowering of the lifting platform are achieved. Conventional lifting machines sold on the market are mainly divided into a column type and a scissor-type, which are mostly adopted in automobile maintenance shops and 4S shops. However, due to their large volume, high space occupation and poor portability, the requirements of mobile maintenance, on-the-spot service, and road rescue cannot be met. 
     SUMMARY 
     The purpose of the present disclosure is to provide a lifting machine with simple structure, small volume and good portability, which may satisfy various needs of mobile use such as mobile maintenance, on-the-spot service, and road rescue. 
     To achieve the above purpose, the present disclosure adopts the following technical solution: a lifting machine of the present disclosure comprising a base and a carrying platform, wherein a lifting mechanism for lifting the carrying platform and a power mechanism for supplying power to the lifting mechanism are arranged between the carrying platform and the base. 
     The base comprises a front base supporting rod and a rear base supporting rod which are horizontally arranged and are equal in length, wherein the front base supporting rod and the rear base supporting rod are arranged in parallel in a front-to-back manner. The left end of the front base supporting rod and the left end of the rear base supporting rod are connected through a first rotating shaft, and the first rotating shaft is rotatably connected to the left end of the front base supporting rod and the left end of the rear base supporting rod. 
     The carrying platform comprises two carrying platform supporting rods with equal length which are horizontally arranged. The lengths of the two carrying platform supporting rod are greater than that of the front base supporting rod. The two carrying platform supporting rods are arranged in parallel in a front-to-back manner. The left ends of the two carrying platform supporting rods are connected through a second rotating shaft, and the second rotating shaft is rotatably connected to the left ends of the two carrying platform supporting rods. The right ends of the two carrying platform supporting rods are connected through a third rotating shaft, and the third rotating shaft is rotatably connected to the right ends of the two carrying platform supporting rods. 
     The lifting mechanism comprises a first lifting rod, a second lifting rod, a third lifting rod, a fourth lifting rod, a fifth lifting rod, a sixth lifting rod, a seventh lifting rod and an eighth lifting rod which are equal in length. The first lifting rod and the second lifting rod are arranged in parallel in a front-to-back manner, the third lifting rod and the fourth lifting rod are arranged in parallel in a front-to-back manner, the fifth lifting rod and the sixth lifting rod are arranged in parallel in a front-to-back manner, and the seventh lifting rod and the eighth lifting rod are arranged in parallel in a front-to-back manner. 
     A first pin shaft is rotatably erected between the two carrying platform supporting rods, and the first pin shaft is arranged between the second rotating shaft and the third rotating shaft. The upper ends of the first lifting rod, the second lifting rod, the fifth lifting rod and the sixth lifting rod are respectively rotatably arranged on the first pin shaft. The lower ends of the fifth lifting rod and the sixth lifting rod are rotatably arranged on the first rotating shaft, and the upper ends of the third lifting rod and the fourth lifting rod are rotatably arranged on the second rotating shaft. The lower end of the first lifting rod is connected to the lower end of the third lifting rod through a first connecting rod, and the lower end of the first lifting rod is rotatably connected to the right end of the first connecting rod. The lower end of the third lifting rod is rotatably connected to the left end of the first connecting rod, and the lower end of the second lifting rod is connected to the lower end of the fourth lifting rod through a second connecting rod. The lower end of the second lifting rod is rotatably connected to the right end of the second connecting rod, and the lower end of the fourth lifting rod is rotatably connected to the left end of the second connecting rod. The upper ends of the seventh lifting rod and the eighth lifting rod are rotatably arranged on the third rotating shaft. The lower end of the seventh lifting rod is rotatably connected to the right end of the front base supporting rod, and the lower end of the eighth lifting rod is rotatably connected to the right end of the rear base supporting rod. 
     The lower ends of the third lifting rod and the fourth lifting rod are connected through a fourth rotating shaft. The lower ends of the third lifting rod and the fourth lifting rod, as well as the left ends of the first connecting rod and the second connecting rod, are rotatably connected with the fourth rotating shaft. 
     A locking mechanism for locking the highest lifting position of the carrying platform is arranged in front of the fourth rotating shaft and the first rotating shaft. 
     The power mechanism is an oil cylinder. A horizontal driving connecting rod is fixedly erected between the seventh lifting rod and the eighth lifting rod. A cylinder body of the oil cylinder is rotatably arranged on the driving connecting rod, and a piston rod of the oil cylinder is rotatably arranged on the fourth rotating shaft. 
     In another aspect of the present disclosure, the locking mechanism comprises a locking hook, and the locking hook further comprises a locking plate. The left end of the locking plate is rotatably mounted on the first rotating shaft, and the right end of the locking plate is bent downwards to form a bent portion inclining to the left from top to bottom. A hooking groove is formed between the bent portion and the locking plate, and a locking convex block protruding upwards is arranged on the fourth rotating shaft. When the lifting machine is in a locked state, the locking convex block is located in the hooking groove, and the left end surface of the bent portion is hooked on the right end surface of the locking convex block. The aforesaid locking mechanism has a simple structure, which achieves locking and unlocking through manual operation. Thus, a convenient operation is realized. 
     In another aspect of the present disclosure, the driving connecting rod is located between the upper end and the lower end of the seventh lifting rod. According to this design, the oil cylinder is arranged inclinedly, and the force provided by the oil cylinder is divided into a horizontal supporting force and a vertical supporting force, which makes the overall lifting of the present disclosure more stable. Meanwhile, the inclinedly-arranged oil cylinder isn&#39;t in contact with other parts, thus keeping other parts clean and tidy. 
     In another aspect of the present disclosure, both ends of the first connecting rod and the second connecting rod are provided with rolling wheels, which are capable of transmitting a pushing force. 
     In another aspect of the present disclosure, the front base supporting rod and the rear base supporting rod are connected through a horizontally arranged connecting base plate, and the rolling wheels are arranged on the connecting base plate in a rolling manner. Through the arrangement of the connecting base plate, the overall structure of the present disclosure becomes more stable, and the synchronous linkage of the lifting gets better. 
     In another aspect of the present disclosure, the upper ends of the first lifting rod, the second lifting rod, the third lifting rod, and the fourth lifting rod are located inside the two carrying platform supporting rods. The lower ends of the first lifting rod, the second lifting rod, the third lifting rod, and the fourth lifting rod are respectively located inside the front base supporting rod and the rear base supporting rod. The upper ends of the fifth lifting rod and the sixth lifting rod are respectively located outside the two carrying platform supporting rods, and the lower ends of the fifth lifting rod and the sixth lifting rod are respectively located outside the front base supporting rod and the rear base supporting rod. The upper ends of the seventh lifting rod and the eighth lifting rod are located inside the two carrying platform supporting rods, and the lower ends of the seventh lifting rod and the eighth lifting rod are respectively located inside the front base supporting rod and the rear base supporting rod. As the space between the base and the carrying platform of the lifting machine is reasonably utilized, the overall structure is compact, the size is small, and the portability is good. 
     In another aspect of the present disclosure, the two ends of the carrying platform are respectively provided with a horizontal supporting plate, and the supporting plate is fixedly mounted between the two carrying platform supporting rods. A supporting cushion block is detachably arranged on the supporting plate. Through arranging the supporting plate, a more stable structure is achieved, and better synchronous linkage of the lifting is realized. Meanwhile, the supporting plate provides a stably-supported space for the supporting cushion block, which functions as a cushioning when an automobile is lifted. 
     In another aspect of the present disclosure, the lifting machine further comprises an extension assembly. The extension assembly comprises two base extension supporting rods with equal length, two carrying platform extension supporting rods with equal length, a ninth lifting rod and a tenth lifting rod which are equal in length, and a base extension supporting rod and a carrying platform extension supporting rod which are equal in length, wherein the ninth lifting rod and the first lifting rod are equal in length. 
     The two base extension supporting rods are arranged in parallel in a front-to-back manner, the spacing between the two base extension supporting rods is equal to that between the front base supporting rod and the rear base supporting rod. The right ends of the two base extension supporting rods are connected to a fifth rotating shaft, and the fifth rotating shaft is rotatably connected to the right ends of the two base extension supporting rods. 
     The two carrying platform extension supporting rods are arranged in parallel in a front-to-back manner, and the spacing between the two carrying platform extension supporting rods is equal to that between the two carrying platform supporting rods. The right ends of the two carrying platform extension supporting rods are connected to a sixth rotating shaft, and the sixth rotating shaft is rotatably connected to the right ends of the two carrying platform extension supporting rods. 
     The upper ends of the ninth lifting rod and the tenth lifting rod are rotatably arranged on the sixth rotating shaft, and the lower ends of the ninth lifting rod and the tenth lifting rod are rotatably arranged on the fifth rotating shaft. 
     The front base supporting rod and the base extension supporting rod located at the rear, the front base supporting rod and the base extension supporting rod located at the front, the carrying platform supporting rod located at the front and the carrying platform extension supporting rod located at the front, as well as the carrying platform supporting rod located at the rear and the carrying platform extension supporting rod located at the rear are respectively rotatably connected through a connecting plate. After an automobile is lifted, the seventh lifting rod, the eighth lifting rod, the ninth lifting rod, the tenth lifting rod, the two base extension supporting rods, the two carrying platform extension supporting rods, and the four connecting plates form a parallelogram-shaped supporting frame. The arrangement of the extension assembly makes the lifting machine of the present disclosure suitable for automobiles with various lengths, and so a high universality is realized. After the extension assembly is installed and lifted up, by means of the parallelogram-shaped supporting frame, stable overall supporting and ideal balance are achieved. 
     In another aspect of the present disclosure, the connecting plate is provided with a plurality of mounting through holes from left to right at intervals. The same positions of the front base supporting rod and the rear base supporting rod, as well as the left ends of the two base extension supporting rods are all provided with base mounting through holes. A detachable connection between the connecting plate and the front base supporting rod, and a detachable connection between the rear base supporting rod and the two base extension supporting rods are achieved through base connecting shafts arranged between the base mounting through holes and the corresponding mounting through holes. The left end of the base extension supporting rod and the base connecting shaft are rotatably connected. 
     The same positions of the two carrying platform supporting rods and the left ends of the two carrying platform extension supporting rods are provided with carrying platform mounting through holes. A detachable connection between the connecting plate and the two carrying platform supporting rods, and a detachable connection between the connecting plate and the two carrying platform extension supporting rods are achieved through carrying platform connecting shafts arranged between the carrying platform mounting through holes and the corresponding mounting through holes. The left end of the carrying platform extension supporting rod and the carrying platform connecting shaft are rotatably connected. 
     A connecting line between the center of the carrying platform mounting through a hole in the carrying platform supporting rod located at the front and the center of the base mounting through a hole in the front base supporting rod is parallel to the central axis of the seventh lifting rod. A connecting line between the center of the carrying platform mounting through a hole in the carrying platform supporting rod located at the rear and the center of the base mounting through a hole in the rear base supporting rod is parallel to the central axis of the eighth lifting rod. According to the aforesaid design, the length of the extension assembly may be adjusted according to different automobiles, achieving a high universality of the lifting machine. 
     In another aspect of the present disclosure, an extension connecting plate is arranged between the two carrying platform extension supporting rods, and a supporting cushion block is detachably arranged on the extension connecting plate. Through arranging the extension connecting plate, the overall structure becomes more stable, and the synchronous linkage of the lifting gets better. Meanwhile, a stably-supported space is provided to the supporting cushion block functioning as a cushioning when an automobile is lifted. 
     An extension bottom plate is arranged between the two base extension supporting rods. Through the arrangement of the extension bottom plate, the synchronous linkage of the lifting becomes better. 
     Compared with the prior art, the present disclosure has the following advantages: after an automobile is lifted by the lifting mechanism, the first lifting rod, the second lifting rod, the third lifting rod, the fourth lifting rod, the front base supporting rod, the rear base supporting rod and the carrying platform supporting rod combine to form a parallelogram-shaped supporting frame. In the meantime, the fifth lifting rod, the sixth lifting rod, the seventh lifting rod, the eighth lifting rod, the front base supporting rod, the rear base supporting rod and the carrying platform supporting rod combine to form a parallelogram-shaped supporting frame in the reverse direction of the aforesaid supporting frame. The two parallelogram-shaped supporting frames in opposite directions interact with each other, thereby achieving stable lifting and supporting of the present disclosure. Compared with conventional lifting machines, the present disclosure has simple structure, low weight and small volume. Its good portability allows the present disclosure to be conveniently carried with an automobile, so that the requirement of mobile maintenance is met. Moreover, the present disclosure is suitable for home storage, and so the self-maintenance of an automobile becomes easy. The synchronous linkage of the third lifting rod and the fourth lifting rod is achieved through the fourth rotating shaft, making the lifting more stable. Additionally, the length of the carrying platform supporting rod is greater than that of the base supporting rod. After an automobile is lifted and supported, a trapezoidal structure whose upper portion is bigger than the lower portion is formed. Meanwhile, through the locking mechanism arranged between the first rotating shaft and the fourth rotating shaft, a highest lifting position is locked. In this way, each connection point of the trapezoidal structure forms a stably-fixed point such that the overall lifting and supporting is more stable. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a three-dimensional diagram illustrating an example structure when the lifting machine in embodiment 1 of the present disclosure is in an unfolded state. 
         FIG.  2    is an enlarged diagram of portion A in  FIG.  1   . 
         FIG.  3    is a conceptual diagram illustrating an example structure when the lifting machine in embodiment 1 of the present disclosure is in a folded state. 
         FIG.  4    is a three-dimensional diagram illustrating an example structure when the lifting machine in embodiment 2 of the present disclosure is unfolded and locked. 
         FIG.  5    is an enlarged diagram of portion B in  FIG.  4   . 
         FIG.  6    is a conceptual diagram illustrating an example structure when the lifting machine in embodiment 2 of the present disclosure is in a folded state. 
         FIG.  7    is an explosive view when the lifting machine in embodiment 2 of the present disclosure is in an unfolded state. 
         FIG.  8    is a conceptual diagram illustrating an example structure when the first lifting rod, the second lifting rod, the third lifting rod and the fourth lifting rod are connected and interact with each other in an unfolded state. 
     
    
    
     DETAILED DESCRIPTION 
     Figures and detailed embodiments are combined hereinafter to further elaborate the technical solution of the present disclosure. 
     Embodiment 1: as shown in  FIGS.  1 - 3  and  8   , the lifting machine of the present disclosure comprises a base  1  and a carrying platform  2 , wherein a lifting mechanism for lifting the carrying platform  2  and a power mechanism for supplying power to the lifting mechanism are arranged between the carrying platform  2  and the base  1 . 
     The base  1  comprises a front base supporting rod  101  and a rear base supporting rod  102  which are horizontally arranged and are equal in length, wherein the front base supporting rod  101  and the rear base supporting rod  102  are arranged in parallel in a front-to-back manner. The left end of the front base supporting rod  101  and the left end of the rear base supporting rod  102  are connected through a first rotating shaft  103 , and the first rotating shaft  103  is rotatably connected to the left end of the front base supporting rod  101  and the left end of the rear base supporting rod  102 . 
     The carrying platform  2  comprises two horizontally arranged carrying platform supporting rods  201  with equal length. The length of the carrying platform supporting rod  201  is greater than that of the front base supporting rod  101 . The two carrying platform supporting rods are arranged in parallel in a front-to-back manner. The left ends of the two carrying platform supporting rods  201  are connected through a second rotating shaft  202 , and the second rotating shaft  202  is rotatably connected to the left ends of the two carrying platform supporting rods  201 . The right ends of the two carrying platform supporting rods  201  are connected through a third rotating shaft  203 , and the third rotating shaft  203  is rotatably connected to the right ends of the two carrying platform supporting rods  201 . 
     The lifting mechanism comprises a first lifting rod J 1 , a second lifting rod J 2 , a third lifting rod J 3 , a fourth lifting rod J 4 , a fifth lifting rod J 5 , a sixth lifting rod J 6 , a seventh lifting rod J 7  and an eighth lifting rod J 8  which are equal in length. The first lifting rod J 1  and the second lifting rod J 2  are arranged in parallel in a front-to-back manner, the third lifting rod J 3  and the fourth lifting rod J 4  are arranged in parallel in a front-to-back manner, the fifth lifting rod J 5  and the sixth lifting rod J 6  are arranged in parallel in a front-to-back manner, and the seventh lifting rod J 7  and the eighth lifting rod J 8  are arranged in parallel in a front-to-back manner. 
     A first pin shaft  204  is rotatably erected between the two carrying platform supporting rods  201 , and the first pin shaft  204  is arranged between the second rotating shaft  202  and the third rotating shaft  203 . The upper ends of the first lifting rod J 1 , the second lifting rod J 2 , the fifth lifting rod J 5 , and the sixth lifting rod J 6  are respectively rotatably arranged on the first pin shaft  204 . The lower ends of the fifth lifting rod J 5  and the sixth lifting rod J 6  are rotatably arranged on the first rotating shaft  103 , and the upper ends of the third lifting rod J 3  and the fourth lifting rod J 4  are rotatably arranged on the second rotating shaft  202 . The lower end of the first lifting rod J 1  is connected to the lower end of the third lifting rod J 3  through a first connecting rod J 13 , and the lower end of the first lifting rod J 1  is rotatably connected to the right end of the first connecting rod J 13 . The lower end of the third lifting rod J 3  is rotatably connected to the left end of the first connecting rod J 13 , and the lower end of the second lifting rod J 2  is connected to the lower end of the fourth lifting rod J 4  through a second connecting rod J 24 . The lower end of the second lifting rod J 2  is rotatably connected to the right end of the second connecting rod J 24 , and the lower end of the fourth lifting rod J 4  is rotatably connected to the left end of the second connecting rod J 24 . The upper ends of the seventh lifting rod J 7  and the eighth lifting rod J 8  are rotatably arranged on the third rotating shaft  203 . The lower end of the seventh lifting rod J 7  is rotatably connected to the right end of the front base supporting rod  101 , and the lower end of the eighth lifting rod J 8  is rotatably connected to the right end of the rear base supporting rod  102 . 
     The lower ends of the third lifting rod J 3  and the fourth lifting rod J 4  are connected through a fourth rotating shaft J 34 . The lower ends of the third lifting rod J 3  and the fourth lifting rod J 4 , as well as the left ends of the first connecting rod J 13  and the second connecting rod J 24 , are rotatably connected with the fourth rotating shaft J 34 . 
     A locking mechanism for locking the highest lifting position of the carrying platform  2  is arranged in front of the fourth rotating shaft J 34  and the first rotating shaft  103 . 
     The power mechanism is an oil cylinder  3 . A horizontal driving connecting rod  4  is fixedly erected between the seventh lifting rod J 7  and the eighth lifting rod J 8 . A cylinder body  31  of the oil cylinder  3  is rotatably arranged on the driving connecting rod  4 , and a piston rod  32  of the oil cylinder  3  is rotatably arranged on the fourth rotating shaft J 34 . 
     In this embodiment, the locking mechanism comprises a locking hook  5 , and the locking hook  5  further comprises a locking plate  501 . The left end of the locking plate  501  is rotatably mounted on the first rotating shaft  103 , and the right end of the locking plate  501  is bent downwards to form a bent portion  502  inclining to the left from top to bottom. A hooking groove  503  is formed between the bent portion  502  and the locking plate  501 , and a locking convex block  6  protruding upwards is arranged on the fourth rotating shaft J 34 . When the lifting machine is in a locked state, the locking convex block  6  is located in the hooking groove  503 , and the left end surface of the bent portion  502  is hooked on the right end surface of the locking convex block  6 . The aforesaid locking mechanism has a simple structure, which achieves locking and unlocking through manual operation. Thus, a convenient operation is realized. 
     In this embodiment, the driving connecting rod  4  is located between the upper end and the lower end of the seventh lifting rod J 7 . According to this design, the oil cylinder  3  is arranged inclinedly, and the force provided by the oil cylinder  3  is divided into a horizontal supporting force and a vertical supporting force, which makes the overall lifting of the present disclosure more stable. Meanwhile, the inclinedly-arranged oil cylinder  3  isn&#39;t in contact with other parts, thus keeping other parts clean and tidy. 
     In this embodiment, both ends of the first connecting rod J 13  and the second connecting rod J 24  are provided with rolling wheels  7 , which are capable of transmitting a pushing force. 
     In this embodiment, the front base supporting rod  101  and the rear base supporting rod  102  are connected through a horizontally-arranged connecting base plate  104 , and the rolling wheels  7  are arranged on the connecting base plate  104  in a rolling manner. Through the arrangement of the connecting base plate, the overall structure of the present disclosure becomes more stable, and the synchronous linkage of the lifting gets better. 
     In this embodiment, the upper ends of the first lifting rod J 1 , the second lifting rod J 2 , the third lifting rod J 3  and the fourth lifting rod J 4  are located inside the two carrying platform supporting rods  201 . The lower ends of the first lifting rod J 1 , the second lifting rod J 2 , the third lifting rod J 3  and the fourth lifting rod J 4  are respectively located inside the front base supporting rod  101  and the rear base supporting rod  102 . The upper ends of the fifth lifting rod J 5  and the sixth lifting rod J 6  are respectively located outside the two carrying platform supporting rods  201 , and the lower ends of the fifth lifting rod J 5  and the sixth lifting rod J 6  are respectively located outside the front base supporting rod  101  and the rear base supporting rod  102 . The upper ends of the seventh lifting rod J 7  and the eighth lifting rod J 8  are located inside the two carrying platform supporting rods  201 , and the lower ends of the seventh lifting rod J 7  and the eighth lifting rod J 8  are respectively located inside the front base supporting rod  101  and the rear base supporting rod  102 . As the space between the base  1  and the carrying platform  2  of the lifting machine is reasonably utilized, the overall structure is compact, the size is small, and the portability is good. 
     In this embodiment, the two ends of the carrying platform  2  are respectively provided with a horizontal supporting plate  205 , and the supporting plate  205  is fixedly mounted between the two carrying platform supporting rods  201 . A supporting cushion block  8  is detachably arranged on the supporting plate  205 . Through arranging the supporting plate  205 , a more stable structure is achieved, and a better synchronous linkage of the lifting is realized. Meanwhile, the supporting plate  205  provides a stably-supported space for the supporting cushion block  8 , which functions as a cushioning when an automobile is lifted. 
     When the lifting machine isn&#39;t used, the piston rod  32  of the oil cylinder  3  retracts into the cylinder body  31 . At this point, the whole lifting mechanism is in a folded state. When there&#39;s a need to lift an automobile, the piston rod  32  of the oil cylinder  3  extends outwards to push the fourth rotating shaft J 34 . The pushing force imposed by the piston rod  32  pushes the lifting rods up, thereby lifting the carrying platform  2 . After the carrying platform  2  is lifted in place, the locking hook  5  is hooked on the locking convex block  6 . In this way, the position of the carrying platform is locked. When the lifting machine needs to be folded, the locking hook  5  is removed from the locking convex block  6 , and the piston rod  32  retracts, thus imposing a pulling force on the fourth rotating shaft J 34 . The pulling force imposed by the piston rod  32  pulls the lifting rods down, which allows the carrying platform  2  to be folded downwards. After the piston rod  32  retracts in place, the folding is completed. 
     Embodiment 2: as shown in  FIGS.  4 - 8   , what makes embodiment 1 different from embodiment 2 is that the lifting machine in embodiment 2 further comprises an extension assembly. The extension assembly comprises two base extension supporting rods  11  with equal length, two carrying platform extension supporting rods  21  with equal length, a ninth lifting rod J 9  and a tenth lifting rod J 10  which are equal in length, and a base extension supporting rod  11  and a carrying platform extension supporting rod  21  which are equal in length, wherein the ninth lifting rod J 9  and the first lifting rod J 1  are equal in length. 
     The two base extension supporting rods  11  are arranged in parallel in a front-to-back manner, the spacing between the two base extension supporting rods  11  is equal to that between the front base supporting rod  101  and the rear base supporting rod  102 . The right ends of the two base extension supporting rods  11  are connected to a fifth rotating shaft  12 , and the fifth rotating shaft  12  is rotatably connected to the right ends of the two base extension supporting rods  11 . 
     The two carrying platform extension supporting rods  21  are arranged in parallel in a front-to-back manner, and the spacing between the two carrying platform extension supporting rods  21  is equal to that between the two carrying platform supporting rods  201 . The right ends of the two carrying platform extension supporting rods  21  are connected to a sixth rotating shaft  22 , and the sixth rotating shaft  22  is rotatably connected to the right ends of the two carrying platform extension supporting rods  21 . 
     The upper ends of the ninth lifting rod J 9  and the tenth lifting rod J 10  are rotatably arranged on the sixth rotating shaft  22 , and the lower ends of the ninth lifting rod J 9  and the tenth lifting rod J 10  are rotatably arranged on the fifth rotating shaft  12 . 
     The front base supporting rod  101  and the base extension supporting rod  11  located at the rear, the front base supporting rod  101  and the base extension supporting rod  11  located at the front, the carrying platform supporting rod  201  located at the front and the carrying platform extension supporting rod  21  located at the front, as well as the carrying platform supporting rod  201  located at the rear and the carrying platform extension supporting rod  21  located at the rear are respectively rotatably connected through a connecting plate  9 . After being pushed up, the seventh lifting rod J 7 , the eighth lifting rod J 8 , the ninth lifting rod J 9 , the tenth lifting rod J 10 , the two base extension supporting rods  11 , the two carrying platform extension supporting rods  21  and the four connecting plates  9  form a parallelogram-shaped supporting frame. The arrangement of the extension assembly makes the lifting machine of the present disclosure suitable for automobiles with various lengths, and so a high universality is realized. After the extension assembly is installed and lifted up, by means of the parallelogram-shaped supporting frame, stable overall supporting and ideal balance are achieved. 
     In this embodiment, the connecting plate  9  is provided with a plurality of mounting through holes  91  from left to right at intervals. The same positions of the front base supporting rod  101  and the rear base supporting rod  102 , as well as the left ends of the two base extension supporting rods  11  are all provided with base mounting through holes  13 . A detachable connection between the connecting plate  9  and the front base supporting rod  101 , and a detachable connection between the rear base supporting rod  102  and the two base extension supporting rods  11  are achieved through base connecting shafts  14  arranged between the base mounting through holes  13  and the corresponding mounting through holes  91 . The left end of the base extension supporting rod  11  and the base connecting shaft  14  are rotatably connected. 
     The same positions of the two carrying platform supporting rods and the left ends of the two carrying platform extension supporting rods  11  are provided with carrying platform mounting through holes  23 . A detachable connection between the connecting plate  9  and the two carrying platform supporting rods  201 , and a detachable connection between the connecting plate  9  and the two carrying platform extension supporting rods  21  are achieved through carrying platform connecting shafts  24  arranged between the carrying platform mounting through holes  23  and the corresponding mounting through holes  91 . The left end of the carrying platform extension supporting rod  21  and the carrying platform connecting shaft  24  are rotatably connected. 
     A connecting line between the center of the carrying platform mounting through hole  23  in the carrying platform supporting rod  201  located at the front and the center of the base mounting through hole  13  in the front base supporting rod  101  is parallel to the central axis of the seventh lifting rod J 7 . A connecting line between the center of the carrying platform mounting through hole  23  in the carrying platform supporting rod  201  located at the rear and the center of the base mounting through hole  13  in the rear base supporting rod  102  is parallel to the central axis of the eighth lifting rod J 8 . According to the aforesaid design, the length of the extension assembly may be adjusted according to different automobiles, achieving a high universality of the lifting machine. 
     In this embodiment, an extension connecting plate  10  is arranged between the two carrying platform extension supporting rods  21 , and a supporting cushion block  8  is detachably arranged on the extension connecting plate  10 . Through arranging the extension connecting plate  10 , the overall structure becomes more stable, and the synchronous linkage of the lifting gets better. Meanwhile, a stably supported space is provided to the supporting cushion block  8  functioning as a cushioning when an automobile is lifted. During use, the two supporting plates  205  arranged at the right ends of the two carrying platform supporting rods  201  may be removed according to actual needs. 
     In this embodiment, an extension bottom plate  111  is arranged between the two base extension supporting rods  11 . Through the arrangement of the extension bottom plate  111 , a better synchronous linkage of the lifting is achieved.