Lifting platform car with good protective property

Abstract

The invention relates to the technical field of lifting platform equipment, in particular to a good-protection lifting platform truck which comprises a trailer and a lifting platform. The lifting platform is mounted on the upper portion of the rear side of the trailer and comprises a set of mounting bases parallel to the upper surface of the rear side of the trailer, a lifting mechanism is mounted at the tops of the mounting bases, an operation table is mounted at the top end of the lifting mechanism through a supporting column, and a self-adaptive supporting mechanism is mounted at the bottoms of the mounting bases. A set of transmission mechanisms are arranged on the upper side and the lower side of the middle of the mounting base, the tops of the transmission mechanisms rotate to drive the lifting platform to ascend and descend, the self-adaptive supporting mechanism comprises self-adaptive supporting frames mounted at the four corners of the bottom of the mounting base, and under the action of the transmission mechanisms, the supporting force of the self-adaptive supporting frames changes in the forward direction along with the lifting mechanism. The supporting area and the stability of the self-adaptive supporting frame are synchronously improved along with gradual rising of the lifting mechanism.

Description

Technical Field

[0001] The invention relates to the technical field of lifting platform equipment, in particular to a lifting platform vehicle with good protective performance. Background Art

[0002] The lifting platform vehicle is a lifting mechanical equipment used for aerial work and maintenance. The traditional lifting platform vehicle mainly consists of a base, a lifting bracket installed on the base, and a platform installed on the lifting bracket. When the existing lifting platform vehicle is in operation, the corresponding positioning structure is first used to firmly install it on the vehicle body, and then the height of the platform is controlled and adjusted. Although the operation sequence of this method is simple, the problem is that the positioning support structure at the bottom, as the platform gradually rises, the center of gravity continues to move upward, and the stability cannot be effectively guaranteed. In addition, some of the most commonly used scissor-type mechanisms themselves have poor stability, and as the height increases, the protection gradually decreases;

[0003] Therefore, in view of the above-mentioned problems, the present technical solution proposes a lifting platform vehicle with good protective performance. Summary of the invention

[0004] The purpose of the present invention is to provide a lifting platform vehicle with good protection to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a lifting platform vehicle with good protective performance, comprising a trailer and a lifting platform; the lifting platform is installed on the upper rear side of the trailer, the lifting platform includes a group of mounting bases parallel to the upper surface of the rear side of the trailer, a lifting mechanism is installed on the top of the mounting base, an operating table is installed on the top of the lifting mechanism through a supporting column, the height of the operating table is adjusted by the lifting mechanism to provide a working platform for the user, an adaptive support mechanism is installed on the bottom of the mounting base, a group of transmission mechanisms are arranged on the upper and lower sides of the middle part of the mounting base, the top of the transmission mechanism rotates to drive the lifting platform to rise and fall, and the bottom rotates to drive the adaptive support mechanism to adjust its support area for the mounting base, the adaptive support mechanism includes an adaptive support frame installed at the four corners of the bottom of the mounting base, under the action of the transmission mechanism, the support strength of the adaptive support frame changes with the positive direction of the lifting mechanism, that is, as the lifting mechanism gradually rises, the support area and stability of the adaptive support frame are simultaneously improved, so as to achieve the best protection effect when facing operating tables of different heights.

[0006] Preferably, a fence is installed on the top of the trailer around the lifting platform, and a guardrail is also installed on the top edge of the operating platform.

[0007] Preferably, the transmission mechanism includes a transmission rod rotatably arranged at the center of the mounting base, a driven tooth is installed on the top of the transmission rod, a driving tooth is meshed with one side of the driven tooth, a servo motor fixed on the mounting base is connected to the middle of the bottom of the driving tooth, the top of the driven tooth is connected to the lifting platform, the bottom end of the transmission rod extends to the lower part of the mounting base and is connected to a transmission main shaft, and the transmission main shaft is rotatably connected to the adaptive support frame through a transmission belt toward the four corners of the bottom of the mounting base.

[0008] Preferably, the lifting platform includes a lead screw 2 fixed to the top end of the driven tooth, a group of rectangular nuts are threadedly connected to the lead screw 2, and a guide device for limiting its rotation is provided on the rectangular nut, a group of middle lifting U-shaped plates are fixedly installed on both sides of the rectangular nut through connecting plates, the outer side of the middle lifting U-shaped plate is threadedly lifting connected to a group of bottom fixed U-shaped plates fixed at the bottom on the mounting base, the inner side of the middle lifting U-shaped plate is threadedly lifting installed with a group of middle lifting U-shaped plates 2, the inner side of the middle lifting U-shaped plate is threadedly lifting installed with a group of top connecting U-shaped plates, the top of the top connecting U-shaped plate is fixedly connected to the operating table through a supporting column, and the inner side walls of the bottom fixed U-shaped plate are installed with a group of Two sets of racks are installed, one set is set on each of the left and right vertical side walls and distributed front and back, and a penetrating driving gear groove is opened on the two vertical side walls of the middle lifting U-shaped plate corresponding to the position of the rack on the bottom fixed U-shaped plate, and a driving gear is rotatably arranged inside the driving gear groove, and the outside of the driving gear is meshed with the rack on the inner wall of the bottom fixed U-shaped plate, and a rack is fixedly installed on one side of the vertical inner wall of the middle lifting U-shaped plate where the driving gear groove is symmetrically distributed. Similarly, the middle lifting U-shaped plate two is placed on the inner side of the middle lifting U-shaped plate one, and the lifting rail is placed on the inner side of the middle lifting U-shaped plate two, and the middle lifting U-shaped plate two and the vertical side walls of the top connecting U-shaped plate are also provided with corresponding racks, driving gear grooves and driving gears rotatably arranged inside the driving gear grooves.

[0009] Preferably, two vertical lifting rails are provided on the inner walls of the bottom fixed U-shaped plate, the middle lifting U-shaped plate 1 and the middle lifting U-shaped plate 2 on the side opposite to the opening, and sliding rods are installed on the rear side walls of the middle lifting U-shaped plate 1, the middle lifting U-shaped plate 2 and the top connecting U-shaped plate corresponding to the lifting rails, and the sliding rods slide longitudinally along the lifting rails.

[0010] Preferably, the adaptive support frame includes a transmission auxiliary shaft rotatably arranged at the bottom of the mounting base, a connecting rod is installed at the bottom end of the transmission auxiliary shaft, the transmission auxiliary shaft is rotatably connected to the transmission main shaft through a transmission belt on the side facing the transmission main shaft, a lead screw is installed at the bottom end of the connecting rod, and the bottom end of the lead screw is rotatably connected to a fixed positioning plate through a bearing, and in the initial state, it is fixedly connected to the vehicle body through the fixed positioning plate.

[0011] Preferably, a fixed plate is fixedly installed on the lower side of the connecting rod, and three rod grooves are opened in an annular manner at the four corners of the bottom edge of the fixed plate. A swing rod is swingably connected to the inside of the rod groove through a rotating shaft, and the outer end of the swing rod extends to the outside of the rod groove and is connected to a support leg, and a movable positioning plate is installed at the bottom of the support leg, and the movable positioning plate is in contact with the top of the trailer, and an annular nut is threadedly connected to the lead screw, and a swing frame is installed on the circumferential outer wall of the annular nut at the position of the support leg corresponding to the support leg, and a fixing ring is fixedly sleeved on the lower part of the support leg corresponding to each group of swing frames, and a swing frame is also installed at the position of the fixing ring facing the annular nut, and a supporting swing rod is swingably connected to the swing frame between the annular nut and the fixing ring, and a guide device for limiting its rotation is provided on the annular nut.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: by adopting the rotation of a single set of motor servo motors, the active teeth and the driven teeth are cooperated to synchronously drive the second lead screw and the transmission main shaft to rotate. When the second lead screw rotates, the height of the operating table is adjusted under the thread lifting of the bottom fixed U-shaped plate, the middle lifting U-shaped plate one, the middle lifting U-shaped plate two, and the top connecting U-shaped plate, and the bottom fixed U-shaped plate, the middle lifting U-shaped plate one, the middle lifting U-shaped plate two, and the top connecting U-shaped plate are raised to form a triangular structure as a whole, so as to stably support the operating table.

[0013] Furthermore, by utilizing the rotation of the transmission main shaft and the transmission belt, the three groups of movable positioning plates around each group of fixed positioning plates are driven to continuously expand outward, increasing the bottom area of ​​the triangular support. In this way, as the operating platform rises, the supporting stability of the bottom of the mounting base also increases synchronously, thereby realizing an adaptive and highly protective lifting platform vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The figure is a structural diagram of a lifting platform vehicle with good protection.

[0015] Figure 2 The present invention is a schematic diagram of the three-dimensional structure of a lifting platform in a lifting platform vehicle with good protective performance.

[0016] Figure 3 The present invention is a schematic diagram of the rear view structure of a lifting platform in a lifting platform vehicle with good protection.

[0017] Figure 4 The present invention is a schematic diagram of the upward structure of a lifting platform in a lifting platform vehicle with good protection.

[0018] Figure 5 The figure is a schematic diagram of the structure of an adaptive support mechanism in a lifting platform vehicle with good protection.

[0019] Figure 6 for Figure 5 Schematic diagram of the enlarged structure of A.

[0020] Figure 7 for Figure 5 A schematic diagram of the enlarged structure of B;

[0021] Among them: trailer 10, fence 11, lifting platform 12, mounting base 13, servo motor 14, driving gear 15, driven gear 16, transmission main shaft 17, transmission belt 18, transmission auxiliary shaft 19, fixed plate 20, screw 1 21, fixed positioning plate 22, ring nut 23, swing rod 24, rod groove 25, swing frame 26, support swing rod 27, fixing ring 28, bottom fixed U-shaped plate 29, operating table 30, middle lifting U-shaped plate 1 31, top connecting U-shaped plate 32, screw 2 33, rectangular nut 34, connecting plate 35, sliding rod 36, driving gear groove 37, rack 38, driving gear 39, support column 40, movable positioning plate 41, lifting slide rail 42, middle lifting U-shaped plate 2 43, supporting leg 44. DETAILED DESCRIPTION

[0022] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0023] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0025] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0026] See also Figure 1-Figure 3 A lifting platform vehicle with good protection includes a trailer 10 and a lifting platform 12; the lifting platform 12 is installed on the upper rear side of the trailer 10, the lifting platform 12 includes a group of mounting bases 13 parallel to the upper surface of the rear side of the trailer 10, a lifting mechanism is installed on the top of the mounting base 13, an operating table 30 is installed on the top of the lifting mechanism through a supporting column 40, the height of the operating table 30 is adjusted by the lifting mechanism, and a working platform is provided for the user, an adaptive support mechanism is installed at the bottom of the mounting base 13, a group of transmission mechanisms are arranged on the upper and lower sides of the middle of the mounting base 13, the top of the transmission mechanism rotates to drive the lifting platform 12 to rise and fall, and the bottom rotates to drive the adaptive support mechanism to adjust its support area for the mounting base 13, the adaptive support mechanism includes an adaptive support frame installed at the four corners of the bottom of the mounting base 13, under the action of the transmission mechanism, the support strength of the adaptive support frame changes with the positive direction of the lifting mechanism, that is, as the lifting mechanism gradually rises, the support area and stability of the adaptive support frame are synchronously improved, so as to achieve the best protection effect when facing operating tables 30 of different heights.

[0027] In the embodiment of the present invention, a fence 11 is installed on the top of the trailer 10 around the lifting platform 12 to provide a certain degree of protection; a guardrail is also installed on the top edge of the operating platform 30 to provide additional protection for construction personnel standing on the operating platform 30;

[0028] It should be noted that, in order to maintain the stability of the lifting platform 12 placed on the trailer 10 and prevent it from tilting due to the shaking of the trailer 10, according to the configuration of the existing lifting platform vehicle, positioning members fixed in contact with the ground are arranged around the trailer 10, and the positioning members can generally be arranged as an outrigger system:

[0029] Telescopic legs: Telescopic legs are usually installed at the four corners of the lift platform vehicle, which can support the vehicle body after the vehicle is raised to prevent tilting or overturning.

[0030] Hydraulic outriggers: The hydraulic system controls the lifting and lowering of the outriggers, which can quickly stabilize the vehicle body and adapt to different ground conditions;

[0031] Or use locating pins: On some lift platform vehicles, locating pins or locking devices may be set to lock the platform position when raising and lowering to ensure its stability.

[0032] The specific structure and selection depend on the actual situation and will not be described in detail here.

[0033] In one embodiment of the present invention, the transmission mechanism includes a transmission rod rotatably arranged at the center of the mounting base 13, a driven tooth 16 is installed on the top of the transmission rod, and a driving tooth 15 is meshed on one side of the driven tooth 16. The bottom middle part of the driving tooth 15 is connected to a servo motor 14 fixed on the mounting base 13, that is, the servo motor 14 is started to drive the driving tooth 15 to rotate, thereby driving the driven tooth 16 to control the rotation of the transmission rod, the top of the driven tooth 16 is connected to the lifting platform 12, the bottom end of the transmission rod extends to the lower part of the mounting base 13 and is connected to a transmission main shaft 17, and the transmission main shaft 17 is rotatably connected to the adaptive support frame through a transmission belt 18 toward the four corners of the bottom of the mounting base 13, thereby realizing the use of a single set of motor servo motors 14 to drive the lifting platform 12 and multiple sets of adaptive support frames to change and operate in the same direction.

[0034] As a preferred embodiment of the present invention, the lifting platform 12 includes a lead screw 2 33 fixed to the top end of the driven gear 16, a group of rectangular nuts 34 are threadedly connected to the lead screw 2 33, and a guide device for limiting its rotation is provided on the rectangular nut 34. A group of middle lifting U-shaped plates 31 are fixedly installed on both sides of the rectangular nut 34 through a connecting plate 35, and a group of bottom fixed U-shaped plates 29 with the bottom fixed on the mounting base 13 are threadedly connected to the outer side of the middle lifting U-shaped plate 31, and a group of middle lifting U-shaped plates 2 43 are threadedly installed on the inner side of the middle lifting U-shaped plate 31, and a group of top connecting U-shaped plates 32 are threadedly installed on the inner side of the middle lifting U-shaped plate 2 43, and the top of the top connecting U-shaped plate 32 is fixedly connected to the operating table 30 through a support column 40. Two groups of racks 38 are installed on the inner side walls of the bottom fixed U-shaped plate 29, one group is arranged on each of the left and right vertical side walls and distributed in the front and back parts, and two groups of racks 38 are installed on the inner side walls of the bottom fixed U-shaped plate 29, one group is arranged on each of the left and right vertical side walls and distributed in the front and back parts, and the middle lifting U-shaped plate 31 has two A driving gear groove 37 is provided on the vertical side wall at a position corresponding to the rack 38 on the bottom fixed U-shaped plate 29, and a driving gear 39 is rotatably arranged inside the driving gear groove 37, and the outside of the driving gear 39 meshes with the rack 38 on the inner wall of the bottom fixed U-shaped plate 29, and a rack 38 is fixedly installed on one side of the vertical inner wall of the middle lifting U-shaped plate 1 31 where the driving gear groove 37 is symmetrically distributed. Similarly, the middle lifting U-shaped plate 2 43 is placed on the inner side of the middle lifting U-shaped plate 1 31, and the lifting rail 42 is placed on the inner side of the middle lifting U-shaped plate 2 43. The middle lifting U-shaped plate 2 43 and the vertical side walls of the top connecting U-shaped plate 32 are also provided with corresponding racks 38, driving gear grooves 37, and driving gears 39 are rotatably arranged inside the driving gear grooves 37. Through the meshing between the driving gear 39 and the rack 38, the rectangular nut 34 is coordinated with the lifting and lowering of the lead screw 2 33 to gradually lift the top connecting U-shaped plate 32 upward, thereby adjusting the use height of the operating table 30;

[0035] Since the top connecting U-shaped plate 32, the middle lifting U-shaped plate 2 43, the middle lifting U-shaped plate 1 31, and the bottom fixed U-shaped plate 29 adopt a stepped wrapping lifting distribution, while continuously rising, the whole presents a triangular structure, which makes it sufficiently stable;

[0036] In order to increase the stability of the bottom fixed U-shaped plate 29, the middle lifting U-shaped plate 1 31, the middle lifting U-shaped plate 2 43, and the top connecting U-shaped plate 32 when sliding longitudinally, two vertical lifting rails 42 are provided on the inner walls of the bottom fixed U-shaped plate 29, the middle lifting U-shaped plate 1 31, and the middle lifting U-shaped plate 2 43 on the side of the opening relative to each other, and a slide bar 36 is installed on the rear side wall of the middle lifting U-shaped plate 1 31, the middle lifting U-shaped plate 2 43, and the top connecting U-shaped plate 32 corresponding to the lifting rail 42, and the slide bar 36 slides longitudinally along the lifting rail 42 to maintain a stable lifting;

[0037] It should be noted that, according to the design lifting travel requirements of the operating table 30, the number of middle lifting U-shaped plates can be determined according to the specific height, and the adjacent middle lifting U-shaped plates are distributed inside and outside and are connected by threaded lifting on both sides.

[0038] As a preferred embodiment of the present invention, refer to Figure 4-Figure 7 The adaptive support frame includes a transmission auxiliary shaft 19 rotatably arranged at the bottom of the mounting base 13, and a connecting rod is installed at the bottom end of the transmission auxiliary shaft 19. The transmission auxiliary shaft 19 is rotatably connected with the transmission main shaft 17 through a transmission belt 18 toward the side of the transmission main shaft 17, that is, the rotational kinetic energy of the transmission main shaft 17 is transmitted to the surrounding transmission auxiliary shafts 19 by the transmission of the transmission belt 18, so as to synchronously drive the four groups of transmission auxiliary shafts 19 to rotate and operate; a lead screw 21 is installed at the bottom end of the connecting rod, and a fixed positioning plate 22 is rotatably connected to the bottom end of the lead screw 21 through a bearing. In the initial state, it is fixedly connected to the vehicle body through the fixed positioning plate 22, so that the mounting base 13 is kept stable under the support of the four fixed positioning plates 22;

[0039] A fixed plate 20 is fixedly installed on the lower side of the connecting rod, and three rod grooves 25 are opened in a ring shape at the four corners of the bottom edge of the fixed plate 20. A swing rod 24 is swingably connected to the rod groove 25 through a rotating shaft. The outer end of the swing rod 24 extends to the outside of the rod groove 25 and is connected to a support leg 44. A movable positioning plate 41 is installed at the bottom end of the support leg 44. The movable positioning plate 41 is in contact with the top of the trailer 10. At the same time, a ring nut 23 is threadedly connected to the lead screw 21, and a swing frame 26 is installed on the circumferential outer wall of the ring nut 23 at a position corresponding to the support leg 44, and a fixing ring 28 is fixedly sleeved on the lower part of the support leg 44 corresponding to each group of swing frames 26, and the fixing ring 28 is also installed at the position facing the ring nut 23. A swing frame 26, a support swing rod 27 is swingably connected to the swing frame 26 between the ring nut 23 and the fixed ring 28, and a guide device for limiting its rotation is provided on the ring nut 23. When the transmission auxiliary shaft 19 rotates to drive the lead screw 21 to rotate, the ring nut 23 is synchronously driven to move, and then as the ring nut 23 descends, the bottom of the support swing rod 27 is driven to expand outward, thereby pushing the mobile positioning plate 41 at the bottom of the support leg 44 to expand outward, so that as the operating table 30 continues to rise, the three groups of mobile positioning plates 41 around each group of fixed positioning plates 22 continue to expand outward, thereby increasing the triangular support area of ​​the transmission auxiliary shaft 19, thereby continuously improving the support protection strength;

[0040] Specifically, the bottom of the movable positioning plate 41 is provided with corrugations to increase the contact friction between the movable positioning plate 41 and the top of the trailer 10 .

[0041] The working principle of the present invention is: in the idle position of the device, all the driving parts mentioned above, which refer to the power elements, electrical components and the adapted power supply, are connected through wires, and the electrical connection is completed in the working order. The detailed connection means are well-known technologies in the field. The following mainly introduces the working principle and process, and does not explain the electrical control. During operation, the construction personnel first enter the operating table 30, and then drive the active gear 15 to rotate by controlling the servo motor 14, thereby driving the driven gear 16 to control the upper side lead screw 2 33 and the lower side transmission main shaft 17 to rotate. While the upper side lead screw 2 33 rotates, it drives the rectangular nut 34 to rise upward, and then under the connection of the connecting plate 35 , and the bottom fixed U-shaped plate 29, the middle lifting U-shaped plate 1 31, the middle lifting U-shaped plate 2 43 and the top connecting U-shaped plate 32 are used to rise upward, so as to adjust the operating table 30 to a suitable height. At the same time, the rotation of the transmission main shaft 17, under the transmission of the transmission belt 18, drives the surrounding transmission auxiliary shafts 19 to rotate at the same time, and then drives the annular nut 23 on the screw 1 21 to move downward, and then under the swing of the supporting swing rod 27, as the operating table 30 rises, the screw 1 21 is gradually pushed to extend outward, and then three groups of mobile positioning plates 41 with gradually expanding support ranges are formed around each group of fixed positioning plates 22, thereby continuously increasing the support and stability of the mounting base 13.

[0042] The above describes in detail the preferred implementation of this patent, but this patent is not limited to the above implementation. Various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of this patent.

Claims

1. A lifting platform vehicle with good protection, characterized in that: The invention comprises a trailer (10) and a lifting platform (12); the lifting platform (12) is installed on the upper rear side of the trailer (10); the lifting platform (12) comprises a group of mounting bases (13) parallel to the upper rear side surface of the trailer (10); a lifting mechanism is installed on the top of the mounting base (13); an operating table (30) is installed on the top of the lifting mechanism through a supporting column (40); an adaptive support mechanism is installed on the bottom of the mounting base (13); a group of transmission mechanisms are arranged on the upper and lower sides of the middle of the mounting base (13); the top of the transmission mechanism rotates to drive the lifting platform (12) to rise and fall; the adaptive support mechanism comprises adaptive support frames installed on the four corners of the bottom of the mounting base (13).

2. A protective lifting platform vehicle according to claim 1, characterized in that: A circle of fence (11) is installed on the top of the trailer (10) around the lifting platform (12), and a circle of guardrail is also installed on the top edge of the operating platform (30).

3. A protective lifting platform vehicle according to claim 2, characterized in that: The transmission mechanism comprises a transmission rod rotatably arranged at the center of a mounting base (13), a driven tooth (16) being installed at the top of the transmission rod, a driving tooth (15) being meshed with one side of the driven tooth (16), a servo motor (14) fixed on the mounting base (13) being connected to the middle of the bottom of the driving tooth (15), the top of the driven tooth (16) being connected to the lifting platform (12), the bottom end of the transmission rod extending to the lower part of the mounting base (13) and being connected to a transmission main shaft (17), the transmission main shaft (17) being rotatably connected to an adaptive support frame through a transmission belt (18) toward the four corners of the bottom of the mounting base (13).

4. A protective lifting platform vehicle according to claim 3, characterized in that: The lifting platform (12) includes a second lead screw (33) fixed to the top end of the driven gear (16), a group of rectangular nuts (34) are threadedly connected to the second lead screw (33), and a guide device for limiting the self-rotation of the rectangular nuts (34) is provided on the rectangular nuts (34), a group of middle lifting U-shaped plates (31) are fixedly installed on both sides of the rectangular nuts (34) through connecting plates (35), the outer side of the middle lifting U-shaped plate (31) is threadedly connected to a group of bottom fixed U-shaped plates (29) whose bottom is fixed on the mounting base (13), the inner side of the middle lifting U-shaped plate (31) is threadedly installed with a group of middle lifting U-shaped plates (43), the inner side of the middle lifting U-shaped plate (43) is threadedly installed with a group of top connection U-shaped plates (32), the top of the top connection U-shaped plates (32) is fixedly connected to the operating table (30) through a support column (40), and two groups of racks ( 38), a group of left and right vertical side walls are respectively provided and distributed in the front and rear parts, and a driving gear groove (37) is provided through the two vertical side walls of the middle lifting U-shaped plate (31) corresponding to the position of the rack (38) on the bottom fixed U-shaped plate (29), and a driving gear (39) is rotatably provided inside the driving gear groove (37), and the outside of the driving gear (39) is meshed with the rack (38) on the inner wall of the bottom fixed U-shaped plate (29), and the vertical inner wall of the middle lifting U-shaped plate (31) is symmetrical with the driving gear (38) on the inner wall. A rack (38) is fixedly installed on one side where the wheel groove (37) is distributed. Similarly, the second middle lifting U-shaped plate (43) is placed inside the first middle lifting U-shaped plate (31), and the lifting slide rail (42) is placed inside the second middle lifting U-shaped plate (43). The second middle lifting U-shaped plate (43) and the vertical side wall of the top connecting U-shaped plate (32) are also provided with corresponding racks (38), driving gear grooves (37), and driving gears (39) are rotatably arranged inside the driving gear grooves (37).

5. A protective lifting platform vehicle according to claim 4, characterized in that: Two vertical lifting rails (42) are provided on the inner walls of the bottom fixed U-shaped plate (29), the middle lifting U-shaped plate 1 (31) and the middle lifting U-shaped plate 2 (43) on the opposite side of the opening. Slide bars (36) are installed on the rear side walls of the middle lifting U-shaped plate 1 (31), the middle lifting U-shaped plate 2 (43) and the top connecting U-shaped plate (32) corresponding to the lifting rails (42). The slide bars (36) slide longitudinally along the lifting rails (42).

6. A protective lifting platform vehicle according to claim 5, characterized in that: The adaptive support frame comprises a transmission auxiliary shaft (19) rotatably arranged at the bottom of the mounting base (13), a connecting rod being installed at the bottom end of the transmission auxiliary shaft (19), the transmission auxiliary shaft (19) being rotatably connected to the transmission main shaft (17) through a transmission belt (18) on the side facing the transmission main shaft (17), a lead screw (21) being installed at the bottom end of the connecting rod, the lead screw (21) being rotatably connected to a fixed positioning plate (22) at the bottom end through a bearing, and in an initial state, the lead screw (21) is fixedly connected to the vehicle body through the fixed positioning plate (22).

7. A protective lifting platform vehicle according to claim 6, characterized in that: A fixing plate (20) is fixedly mounted on the lower side of the connecting rod. Three rod grooves (25) are formed in an annular manner at four corners of the bottom edge of the fixing plate (20). A swinging rod (24) is swingably connected to the rod groove (25) via a rotating shaft. The outer end of the swinging rod (24) extends to the outside of the rod groove (25) and is connected to a supporting leg (44). A movable positioning plate (41) is mounted on the bottom end of the supporting leg (44). The movable positioning plate (41) is in contact with the top of the trailer (10). A ring nut (23) is threadedly connected to the lead screw (21). A swing frame (26) is installed at a position corresponding to the support leg (44) on the circumferential outer wall of the ring nut (23), a fixing ring (28) is fixedly sleeved on the lower part of the support leg (44) corresponding to each group of swing frames (26), a swing frame (26) is also installed at a position of the fixing ring (28) facing the ring nut (23), a supporting swing rod (27) is swungly connected to the swing frame (26) between the ring nut (23) and the fixing ring (28), and a guide device for limiting the self-rotation of the ring nut (23) is provided on the ring nut (23).

8. A protective lifting platform vehicle according to claim 7, characterized in that: The bottom of the movable positioning plate (41) is provided with corrugations.

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