Hydraulic lifting platform with movable bearing surface

Abstract

The utility model relates to the technical field of lifting platforms, in particular to a hydraulic lifting platform with a movable bearing surface, which comprises a hydraulic platform arranged right above a bottom plate and used for placing heavy objects; a first notch is formed in the upper end face of the hydraulic platform. The platform extending device is connected with the hydraulic platform and used for extending the length of the hydraulic platform; the platform extending device comprises a first extending piece and a second extending piece, the first extending piece is composed of an extending plate and a vertical plate, the vertical plate is arranged below the extending plate, and the extending plate is arranged in the first notch and connected with the hydraulic platform in a sliding mode. By operating the platform extension device, the platform extension device can push the first extension piece to move towards the outer side, and the platform extension device is in direct butt joint with the placement plate of the sterilization cabinet, so that the length of the platform is directly extended to the front of the placement plate of the sterilization cabinet, a gap bridge plate is not needed any more, and a heavy object is more convenient to move and use.

Description

Technical Field

[0001] The utility model relates to the technical field of lifting platforms, in particular to a hydraulic lifting platform with a movable load-bearing surface. Background Art

[0002] The hydraulic lifting platform is a multifunctional lifting and loading and unloading mechanical equipment. In the existing biopharmaceutical industry, mobile tanks or heavy objects need to be lifted to a specified height during sterilization and pushed into the sterilization cabinet for sterilization. A hydraulic lifting platform is required during the lifting process.

[0003] However, when the existing hydraulic lifting platform is in use, since the placement plate of the sterilizer is located inside the sterilizer and the cabinet door needs to be closed during sterilization, there is a certain distance between the hydraulic lifting platform and the sterilizer, which requires the use of a bridge plate for connection. The bridge plate is heavy and difficult to move, and one end of the bridge plate needs to be placed above the platform, resulting in a height difference between the bridge plate and the platform. It is still necessary to lift the heavy objects onto the bridge plate before moving them into the sterilizer, and the length of the platform cannot be directly extended to the front of the placement plate of the sterilizer, which is inconvenient to use. Utility Model Content

[0004] The purpose of the utility model is to solve the problem of inconvenience in use caused by the inability to directly extend the length of the existing hydraulic lifting platform to the front of the placement plate of the sterilization cabinet.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A hydraulic lifting platform with a movable load-bearing surface, comprising:

[0007] base plate;

[0008] A hydraulic platform is provided directly above the bottom plate and is used to place heavy objects; a first notch is provided on the upper end surface of the hydraulic platform;

[0009] a hydraulic lifting assembly, disposed between the base plate and the hydraulic platform, for lifting the hydraulic platform;

[0010] A platform extension device is connected to the hydraulic platform and is used to extend the length of the hydraulic platform; the platform extension device includes: a first extension member, consisting of an extension plate and a vertical plate, the vertical plate is arranged below the extension plate, the extension plate is arranged in the first notch, and is slidably connected to the hydraulic platform.

[0011] Preferably, the platform extension device further comprises:

[0012] a second hydraulic cylinder, wherein an output end of the second hydraulic cylinder is fixedly connected to the vertical plate;

[0013] Two sets of spur gears, the two sets of spur gears are provided with a rotating shaft and are coaxially arranged through the rotating shaft; the rotating shaft passes through one end of the first extension member and is rotatably connected to the first extension member;

[0014] Two sets of tooth plates, each set of tooth plates is meshed and connected with the spur gear; one end of the tooth plate close to the spur gear is fixedly connected to the hydraulic platform;

[0015] A second extending member, wherein one end of the second extending member close to the hydraulic platform is fixedly connected to the rotating shaft.

[0016] Preferably, a plurality of groups of rollers are evenly arranged in the second notches provided on the surface of the second extension member and are rotatably connected to the second extension member, so as to reduce the friction force suffered by the moving heavy object.

[0017] Preferably, it further includes: a load-bearing device; the load-bearing device is arranged between the base plate and the hydraulic platform and is located on a side close to the second extension member, for supporting the second extension member.

[0018] Preferably, the load-bearing device includes:

[0019] The support member is composed of a horizontal plate and a frame, wherein the top edge of the horizontal plate is fixedly connected to the frame; a first slideway is provided in the middle of the top of the horizontal plate;

[0020] A moving block, wherein a slider is provided at the bottom end of the moving block, the slider is provided in the first slideway, and is slidably connected to the transverse plate through the first slideway;

[0021] a threaded rod, passing through a corresponding position of the moving block and being threadedly connected to the moving block;

[0022] a first motor, wherein an output end of the first motor is fixedly connected to an end of the threaded rod close to the moving block;

[0023] a third hydraulic cylinder, wherein an output end of the third hydraulic cylinder is fixedly connected to an outer surface of the first motor;

[0024] A wedge block is provided at the top end of the moving block, and a second slideway is provided on the inclined surface of the wedge block;

[0025] The movable member is composed of a vertical rod and a sphere, wherein the bottom end of the vertical rod is fixedly connected to the sphere; the sphere is disposed in the second slideway and is slidably connected to the wedge block via the second slideway; the vertical rod passes through a corresponding position of the frame and is slidably connected to the frame;

[0026] The supporting portion is arranged at the top end of the moving member and is rotatably connected to the moving member.

[0027] Preferably, the hydraulic lifting assembly includes:

[0028] Two sets of first connecting rods are arranged between the base plate and the hydraulic platform;

[0029] Two groups of second connecting rods, each group of second connecting rods is arranged crosswise with the first connecting rod and is rotatably connected to the first connecting rod; a rotating rod is arranged between the two groups of second connecting rods and is rotatably connected to the rotating rod;

[0030] Four groups of first articulated seats, two groups of first articulated seats on the same side are rotatably connected to both ends of the first connecting rod respectively; the sides of the two groups of first articulated seats that are away from each other are slidably connected to the base plate and the hydraulic platform respectively;

[0031] Four sets of second articulated seats, two sets of second articulated seats on the same side are rotatably connected to both ends of the second connecting rod respectively; the sides of the two sets of second articulated seats that are away from each other are slidably connected to the base plate and the hydraulic platform respectively;

[0032] A first hydraulic cylinder, wherein the output end of the first hydraulic cylinder is rotatably connected to the rotating rod; and the bottom end of the first hydraulic cylinder is rotatably connected to the bottom plate.

[0033] Preferably, it also includes: two groups of telescopic limit members; the two groups of telescopic limit members are symmetrically arranged on both sides of the base plate, and the two ends of the telescopic limit members are respectively fixedly connected to the base plate and the hydraulic platform, for limiting the hydraulic platform to only vertical movement.

[0034] Preferably, it further comprises: a guardrail; the guardrail is arranged at the upper edge of the hydraulic platform and is fixedly connected to the hydraulic platform to limit the position of the heavy object.

[0035] Preferably, it also includes: two groups of protective devices; the two groups of protective devices are symmetrically arranged on both sides of the hydraulic platform, and are used to prevent heavy objects from moving through the gap of the guardrail.

[0036] Preferably, each set of the protective devices comprises:

[0037] protective box;

[0038] A turntable is disposed inside the protection box and is rotatably connected to the protection box; a cylindrical pin is provided on the upper end surface of the turntable;

[0039] a second motor, wherein an output end of the second motor is fixedly connected to the axis of the turntable;

[0040] A slot plate, which passes through the corresponding position of the protection box and is slidably connected to the protection box; a sliding groove is opened on the surface of the slot plate, so that the cylindrical pin is located in the sliding groove and is slidably connected to the cylindrical pin through the sliding groove;

[0041] A guardrail plate is fixedly connected to one end of the trough plate; one side of the guardrail plate is fitted with the guardrail.

[0042] The beneficial effect proposed by the present invention is that: by operating the platform extension device, the platform extension device will push the first extension member to move outward, and through the direct docking of the platform extension device with the placement plate of the sterilization cabinet, the length of the platform can be directly extended to the front of the placement plate of the sterilization cabinet, and there is no need to use the bridge plate, making the movement of heavy objects more convenient and easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a schematic diagram of the structure of the utility model;

[0044] Figure 2 for Figure 1 Schematic diagram of the main plan view of the middle connection structure;

[0045] Figure 3 for Figure 1 Schematic diagram of the cross-sectional plan of the internal connection structure;

[0046] Figure 4 for Figure 1 Schematic diagram of the central connection structure;

[0047] Figure 5 for Figure 4 A bottom-up perspective diagram of the middle connecting structure;

[0048] Figure 6 for Figure 3 Schematic diagram of the central connection structure;

[0049] Figure 7 for Figure 1 Schematic diagram of the internal connection structure.

[0050] In the figure: 1. base plate, 2. hydraulic platform, 3. first connecting rod, 4. second connecting rod, 5. first articulated seat, 6. second articulated seat, 7. first hydraulic cylinder, 8. guardrail, 9. first extension member, 10. second hydraulic cylinder, 11. spur gear, 12. tooth plate, 13. second extension member, 14. roller, 15. telescopic limit member, 16. threaded rod, 17. first motor, 18. third hydraulic cylinder, 19. moving block, 20. wedge block, 21. moving member, 22. support member, 23. support part, 24. protective box, 25. turntable, 26. second motor, 27. trough plate, 28. guardrail plate. DETAILED DESCRIPTION

[0051] The present invention will be further described below with reference to the accompanying drawings:

[0052] This embodiment:

[0053] See also Figure 1-7 In this embodiment: a hydraulic lifting platform with a movable load-bearing surface includes: a base plate 1, a hydraulic platform 2, a hydraulic lifting component and a platform extension device.

[0054] In this embodiment, the hydraulic platform 2 is arranged directly above the base plate 1 for placing heavy objects; a first notch is opened on the upper end surface of the hydraulic platform 2; and the hydraulic lifting assembly is arranged between the base plate 1 and the hydraulic platform 2 for lifting the hydraulic platform 2.

[0055] In this embodiment, by operating the hydraulic lifting assembly, the hydraulic platform 2 can be pushed to move vertically, thereby lifting the heavy object.

[0056] The platform extension device is connected to the hydraulic platform 2 and is used to extend the length of the hydraulic platform 2; the platform extension device includes: a first extension member 9, which is composed of an extension plate and a vertical plate, the vertical plate is arranged below the extension plate, the extension plate is arranged in the first notch, and is slidably connected to the hydraulic platform 2.

[0057] In this embodiment, by operating the platform extension device, the platform extension device will cause the first extension member 9 to move horizontally, thereby driving the heavy object to move, and increasing the horizontal length of the hydraulic platform 2, so that the first extension member 9 can be in direct contact with the placement plate of the sterilization cabinet, and no longer needs to use the bridge plate, making the movement of heavy objects more convenient.

[0058] like Figure 4 and Figure 5 As shown, the platform extension device further includes: a second hydraulic cylinder 10 , two sets of spur gears 11 , two sets of toothed plates 12 , a second extension member 13 and multiple sets of rollers 14 .

[0059] Specifically, the output end of the second hydraulic cylinder 10 is fixedly connected to the vertical plate.

[0060] In this embodiment, the model of the second hydraulic cylinder 10 is selected according to actual needs and meets the working conditions; the output end of the second hydraulic cylinder 10 can push the first extension member 9 to move horizontally.

[0061] The two sets of spur gears 11 are provided with a rotating shaft and are coaxially arranged through the rotating shaft; the rotating shaft passes through one end of the first extension member 9 and is rotatably connected to the first extension member 9; each set of tooth plates 12 is meshed and connected to the spur gears 11; the end of the tooth plate 12 close to the spur gear 11 is fixedly connected to the hydraulic platform 2.

[0062] In this embodiment, when the first extension member 9 extends, the spur gear 11 is driven to move synchronously. Since the spur gear 11 is in meshing state with the tooth plate 12 , the spur gear 11 moves while rotating counterclockwise under the restriction of the tooth plate 12 .

[0063] One end of the second extension member 13 close to the hydraulic platform 2 is fixedly connected to the rotating shaft.

[0064] In this embodiment, the spur gear 11 drives the second extension member 13 to rotate synchronously.

[0065] The plurality of rollers 14 are evenly disposed in the second notches formed on the surface of the second extension member 13 and are rotatably connected to the second extension member 13 to reduce frictional force experienced by the moving weight.

[0066] When extension is required, the second hydraulic cylinder 10 is adjusted so that the output end of the second hydraulic cylinder 10 pushes the first extension member 9 to move horizontally; the first extension member 9 drives the spur gear 11 to move synchronously; and since the spur gear 11 and the tooth plate 12 are in a meshing state, the spur gear 11 moves while rotating counterclockwise under the restriction of the tooth plate 12; the spur gear 11 drives the second extension member 13 to rotate; when the first extension member 9 is extended to the extreme position, the second extension member 13 is rotated to the horizontal position and directly docked with the placement plate of the sterilizer, so that the length of the platform can be directly extended to the front of the placement plate of the sterilizer, and there is no need to use a bridge plate, which makes the movement of heavy objects more convenient and easy to use.

[0067] After the extension is completed, the weight moves outward, causing the center of gravity of the entire device to shift, and in severe cases, the entire device may fall over.

[0068] To solve the above problems, this embodiment proposes an implementation method, in which the hydraulic lifting platform with a movable load-bearing surface also includes: a load-bearing device; the load-bearing device is arranged between the base plate 1 and the hydraulic platform 2, and is located on the side close to the second extension member 13, for supporting the second extension member 13.

[0069] In this embodiment, Figure 6 As shown, the load-bearing device includes: a support member 22, a moving block 19, a threaded rod 16, a first motor 17, a third hydraulic cylinder 18, a wedge block 20, a moving member 21 and a support portion 23.

[0070] Among them, the support member 22 is composed of a horizontal plate and a frame, and the top edge of the horizontal plate is fixedly connected to the frame; a first slide is opened in the middle of the top of the horizontal plate; a slider is provided at the bottom end of the moving block 19, the slider is set in the first slide, and is slidably connected to the horizontal plate through the first slide.

[0071] In this embodiment, the sliding between the slider and the first slideway restricts the moving block 19 to horizontal movement.

[0072] The threaded rod 16 passes through the corresponding position of the moving block 19 and is threadedly connected to the moving block 19 ; the output end of the first motor 17 is fixedly connected to the end of the threaded rod 16 close to the moving block 19 .

[0073] In this embodiment, the model of the first motor 17 is selected according to actual needs and meets the working conditions; the output end of the first motor 17 can drive the threaded rod 16 to rotate, and the threaded rod 16 can cause the moving block 19 to move horizontally.

[0074] An output end of the third hydraulic cylinder 18 is fixedly connected to an outer surface of the first motor 17 .

[0075] In this embodiment, the model of the third hydraulic cylinder 18 is selected according to actual needs and meets the working conditions; the output end of the third hydraulic cylinder 18 can push the entire load-bearing device to move.

[0076] The wedge block 20 is arranged at the top of the moving block 19, and a second slide is opened on the inclined surface of the wedge block 20; the moving part 21 is composed of a vertical rod and a ball, and the bottom end of the vertical rod is fixedly connected to the ball; the ball is set in the second slide and is slidably connected to the wedge block 20 through the second slide.

[0077] In this embodiment, the moving block 19 drives the wedge block 20 to move synchronously. When the wedge block 20 moves horizontally, it slides between the second slideway and the ball, thereby pushing the moving member 21 to move vertically.

[0078] The vertical rod passes through the corresponding position of the frame and is slidably connected to the frame.

[0079] In this embodiment, the moving member 21 moves vertically under the restriction of the frame.

[0080] The support portion 23 is disposed at the top of the moving member 21 and is rotatably connected to the moving member 21 .

[0081] In this embodiment, the moving member 21 simultaneously pushes the supporting portion 23 to move; a rubber block is provided at the top of the supporting portion 23 , which deforms according to the contact surface with the second extending member 13 .

[0082] During the extension process, as the second extension member 13 rotates, the third hydraulic cylinder 18 is adjusted so that the output end of the third hydraulic cylinder 18 pushes the entire load-bearing device to move in the direction of extension; at the same time, the first motor 17 is started, and the output end of the first motor 17 drives the threaded rod 16 to rotate; the threaded rod 16 causes the moving block 19 to move horizontally in the direction of extension during the movement; the moving block 19 drives the wedge block 20 to move; the wedge block 20 pushes the moving member 21 to move by sliding between the second slide and the ball; and the moving member 21 moves vertically upward under the restriction of the support member 22; at the same time, the moving member 21 pushes the support part 23 to move, and the support part 23 will always be in contact with the second extension member 13 during the movement until the second extension member 13 rotates to a horizontal position and stops, thereby achieving support during the extension process to avoid center of gravity shift.

[0083] like Figure 2 and Figure 3 As shown, the hydraulic lifting assembly includes: two groups of first connecting rods 3, two groups of second connecting rods 4, four groups of first articulated seats 5, four groups of second articulated seats 6 and a first hydraulic cylinder 7.

[0084] Specifically, two groups of first connecting rods 3 are arranged between the base plate 1 and the hydraulic platform 2; each group of second connecting rods 4 is arranged crosswise with the first connecting rod 3 and is rotatably connected to the first connecting rod 3; a rotating rod is arranged between the two groups of second connecting rods 4 and is rotatably connected to the rotating rod.

[0085] In this embodiment, when the second connecting rod 4 rotates, the first connecting rod 3 will rotate synchronously.

[0086] The two groups of first articulated seats 5 on the same side are rotatably connected to the two ends of the first connecting rod 3 respectively; the sides of the two groups of first articulated seats 5 that are away from each other are slidingly connected to the base plate 1 and the hydraulic platform 2 respectively.

[0087] In this embodiment, when the first connecting rod 3 rotates, it drives the two groups of first articulated seats 5 on the same side to slide horizontally, and at the same time pushes the hydraulic platform 2 to move vertically.

[0088] The two sets of second articulated seats 6 on the same side are rotatably connected to the two ends of the second connecting rod 4 respectively; the sides of the two sets of second articulated seats 6 that are away from each other are slidingly connected to the base plate 1 and the hydraulic platform 2 respectively.

[0089] In this embodiment, when the second connecting rod 4 rotates, the two groups of second articulated seats 6 on the same side will move horizontally, and at the same time push the hydraulic platform 2 to move vertically.

[0090] The output end of the first hydraulic cylinder 7 is rotatably connected to the rotating rod; the bottom end of the first hydraulic cylinder 7 is rotatably connected to the bottom plate 1.

[0091] In this embodiment, the model of the first hydraulic cylinder 7 is selected according to actual needs and meets the working conditions; the output end of the first hydraulic cylinder 7 can push the rotating rod to move obliquely, thereby rotating the second connecting rod 4.

[0092] When hydraulic lifting is required, the first hydraulic cylinder 7 is adjusted, and the output end of the first hydraulic cylinder 7 pushes the rotating rod to move obliquely upward; the rotating rod will drive the second connecting rod 4 to rotate, and the second connecting rod 4 will cause the two groups of second articulated seats 6 on the same side to move horizontally, while pushing the hydraulic platform 2 to move vertically; in this process, the first connecting rod 3 will rotate synchronously, and the two groups of first articulated seats 5 on the same side will slide horizontally, making the lifting of the hydraulic platform 2 more stable.

[0093] The load-bearing surface movable hydraulic lifting platform also includes: two sets of telescopic limit members 15; the two sets of telescopic limit members 15 are symmetrically arranged on both sides of the base plate 1, and the two ends of the telescopic limit members 15 are respectively fixedly connected to the base plate 1 and the hydraulic platform 2, used to limit the hydraulic platform 2 to only vertical movement.

[0094] In this embodiment, the telescopic limiter 15 is formed by a solid cylinder and a hollow cylinder being sleeved together. The solid cylinder can slide vertically in the hollow cylinder, thereby limiting the hydraulic platform 2 to move only vertically.

[0095] The load-bearing surface movable hydraulic lifting platform further includes: a guardrail 8; the guardrail 8 is arranged at the upper edge position of the hydraulic platform 2 and is fixedly connected to the hydraulic platform 2 to limit the position of the heavy object.

[0096] During the hydraulic lifting process, shaking will occur, causing some special heavy objects to fall from the feeding direction of the guardrail 8.

[0097] To solve the above problems, this embodiment proposes an implementation method, in which the load-bearing surface movable hydraulic lifting platform also includes: two sets of protective devices; the two sets of protective devices are symmetrically arranged on both sides of the hydraulic platform 2, used to prevent heavy objects from moving through the gap in the guardrail 8.

[0098] In this embodiment, Figure 7 As shown, each set of protection devices includes: a protection box 24, a turntable 25, a second motor 26, a slot plate 27 and a guardrail plate 28.

[0099] The turntable 25 is disposed inside the protection box 24 and is rotatably connected to the protection box 24 .

[0100] In this embodiment, the protection box 24 supports the rotation of the turntable 25 .

[0101] A cylindrical pin is provided on the upper end surface of the turntable 25 . The output end of the second motor 26 is fixedly connected to the axis of the turntable 25 .

[0102] In this embodiment, the model of the second motor 26 is selected according to actual needs and only needs to meet the working conditions; the output end of the second motor 26 can drive the turntable 25 to rotate.

[0103] The groove plate 27 passes through the corresponding position of the protection box 24 and is slidably connected to the protection box 24; a sliding groove is opened on the surface of the groove plate 27, so that the cylindrical pin is located in the sliding groove and is slidably connected to the cylindrical pin through the sliding groove.

[0104] In this embodiment, when the turntable 25 rotates, the cylindrical pin is driven to rotate in a circular motion, and the cylindrical pin slides with the slot plate 27 , causing the slot plate 27 to move horizontally.

[0105] The guardrail plate 28 is fixedly connected to one end of the groove plate 27; one side of the guardrail plate 28 is in contact with the guardrail 8.

[0106] In this embodiment, the groove plate 27 drives the guardrail plate 28 to move synchronously.

[0107] When blocking is required, the second motor 26 is started, and the output end of the second motor 26 drives the turntable 25 to rotate; the turntable 25 causes the cylindrical pin to perform circular motion, and the cylindrical pin slides between the slot plate 27; it causes the slot plate 27 to move horizontally toward the direction of the guardrail 8; the slot plate 27 drives the guardrail plate 28 to move synchronously; after the two sets of guardrail plates 28 are docked, the feed port of the guardrail 8 is blocked to prevent heavy objects from tipping over.

[0108] Working principle:

[0109] When the load-bearing surface movable hydraulic lifting platform is in use, first, the user moves the heavy object to the first extension member 9 through the feed port of the guardrail plate 28. At this time, the first hydraulic cylinder 7 is adjusted, and the output end of the first hydraulic cylinder 7 pushes the rotating rod to move obliquely upward; the rotating rod will drive the second connecting rod 4 to rotate, and the second connecting rod 4 will cause the two groups of second articulated seats 6 on the same side to move horizontally, and at the same time push the hydraulic platform 2 to move vertically; in this process, the first connecting rod 3 will rotate synchronously, and the two groups of first articulated seats 5 on the same side will slide horizontally, making the lifting of the hydraulic platform 2 more stable.

[0110] After moving to the same horizontal plane as the placement plate of the sterilizer, the second hydraulic cylinder 10 is adjusted so that the output end of the second hydraulic cylinder 10 pushes the first extension member 9 to move horizontally; the first extension member 9 drives the spur gear 11 to move synchronously; and since the spur gear 11 and the tooth plate 12 are in a meshing state, the spur gear 11 moves while rotating counterclockwise under the restriction of the tooth plate 12; the spur gear 11 drives the second extension member 13 to rotate; when the first extension member 9 extends to the extreme position, the second extension member 13 is just rotated to the horizontal position and directly docked with the placement plate of the sterilizer, so that the length of the platform is directly extended to the front of the placement plate of the sterilizer, and there is no need to use a bridge plate, which makes the movement of heavy objects more convenient and easy to use.

[0111] During this process, the third hydraulic cylinder 18 is adjusted so that the output end of the third hydraulic cylinder 18 pushes the entire load-bearing device to move in the extension direction; at the same time, the first motor 17 is started, and the output end of the first motor 17 drives the threaded rod 16 to rotate; the threaded rod 16 causes the moving block 19 to move horizontally in the extension direction during the movement; the moving block 19 drives the wedge block 20 to move; the wedge block 20 pushes the moving member 21 to move by sliding between the second slide and the ball; and the moving member 21 moves vertically upward under the restriction of the support member 22; at the same time, the moving member 21 pushes the support part 23 to move, and the support part 23 will always be in contact with the second extension member 13 during the movement until the second extension member 13 rotates to a horizontal position and stops, thereby achieving support during the extension process, avoiding center of gravity shift, and completing the use of this device.

[0112] While the present invention has been shown and described with reference to preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein within the scope of the claims.

Claims

1. A hydraulic lifting platform with a movable load-bearing surface, characterized in that: include: Bottom plate (1); A hydraulic platform (2) is provided directly above the bottom plate (1) and is used for placing heavy objects; a first notch is provided on the upper end surface of the hydraulic platform (2); A hydraulic lifting assembly is provided between the base plate (1) and the hydraulic platform (2) and is used for lifting the hydraulic platform (2); a platform extension device connected to the hydraulic platform (2) and used to extend the length of the hydraulic platform (2); The platform extension device comprises: a first extension member (9) consisting of an extension plate and a vertical plate, wherein the vertical plate is arranged below the extension plate, and the extension plate is arranged in the first notch and is slidably connected to the hydraulic platform (2).

2. The hydraulic lifting platform with movable bearing surface according to claim 1, characterized in that: The platform extension device also includes: a second hydraulic cylinder (10), wherein an output end of the second hydraulic cylinder (10) is fixedly connected to the vertical plate; Two groups of spur gears (11), the two groups of spur gears (11) are provided with a rotating shaft and are coaxially arranged through the rotating shaft; the rotating shaft passes through one end of the first extension member (9) and is rotatably connected to the first extension member (9); Two groups of tooth plates (12), each group of tooth plates (12) is meshedly connected with the spur gear (11); one end of the tooth plate (12) close to the spur gear (11) is fixedly connected to the hydraulic platform (2); A second extension member (13), wherein one end of the second extension member (13) close to the hydraulic platform (2) is fixedly connected to the rotating shaft.

3. The hydraulic lifting platform with movable bearing surface according to claim 2, characterized in that: A plurality of rollers (14) are evenly arranged in the second notches opened on the surface of the second extension member (13) and are rotatably connected to the second extension member (13) to reduce the friction force suffered by the moving heavy object.

4. The hydraulic lifting platform with a movable bearing surface according to claim 2, characterized in that: Also includes: A load-bearing device; the load-bearing device is arranged between the base plate (1) and the hydraulic platform (2), and is located on a side close to the second extension member (13), and is used to support the second extension member (13).

5. The hydraulic lifting platform with movable bearing surface according to claim 4, characterized in that: The load-bearing device comprises: The support member (22) is composed of a transverse plate and a frame, wherein the top edge of the transverse plate is fixedly connected to the frame; a first slideway is provided in the middle of the top of the transverse plate; A moving block (19), wherein a slider is provided at the bottom end of the moving block (19), the slider is provided in the first slideway, and is slidably connected to the transverse plate through the first slideway; A threaded rod (16) passes through a corresponding position of the moving block (19) and is threadedly connected to the moving block (19); a first motor (17), wherein an output end of the first motor (17) is fixedly connected to an end of the threaded rod (16) close to the moving block (19); a third hydraulic cylinder (18), wherein an output end of the third hydraulic cylinder (18) is fixedly connected to an outer surface of the first motor (17); A wedge block (20) is arranged at the top end of the moving block (19), and a second slideway is provided on the inclined surface of the wedge block (20); The movable member (21) is composed of a vertical rod and a sphere, wherein the bottom end of the vertical rod is fixedly connected to the sphere; the sphere is arranged in the second slideway and is slidably connected to the wedge (20) through the second slideway; the vertical rod passes through the corresponding position of the frame and is slidably connected to the frame; The supporting portion (23) is arranged at the top end of the moving member (21) and is rotatably connected to the moving member (21).

6. The hydraulic lifting platform with a movable load-bearing surface according to claim 1, characterized in that: The hydraulic lifting assembly includes: Two sets of first connecting rods (3) are arranged between the base plate (1) and the hydraulic platform (2); Two groups of second connecting rods (4), each group of second connecting rods (4) is arranged crosswise with the first connecting rod (3) and is rotatably connected to the first connecting rod (3); a rotating rod is arranged between the two groups of second connecting rods (4) and is rotatably connected to the rotating rod; Four groups of first articulated seats (5), two groups of first articulated seats (5) on the same side are rotatably connected to the two ends of the first connecting rod (3) respectively; the sides of the two groups of first articulated seats (5) that are away from each other are slidably connected to the base plate (1) and the hydraulic platform (2) respectively; Four groups of second articulated seats (6), two groups of second articulated seats (6) on the same side are rotatably connected to the two ends of the second connecting rod (4); the sides of the two groups of second articulated seats (6) that are away from each other are slidably connected to the base plate (1) and the hydraulic platform (2); A first hydraulic cylinder (7), wherein the output end of the first hydraulic cylinder (7) is rotatably connected to the rotating rod; and the bottom end of the first hydraulic cylinder (7) is rotatably connected to the bottom plate (1).

7. The hydraulic lifting platform with a movable load-bearing surface according to claim 1, characterized in that: Also includes: Two groups of telescopic limiters (15); the two groups of telescopic limiters (15) are symmetrically arranged on both sides of the base plate (1), and the two ends of the telescopic limiters (15) are respectively fixedly connected to the base plate (1) and the hydraulic platform (2), so as to limit the hydraulic platform (2) to only vertical movement.

8. The hydraulic lifting platform with a movable load-bearing surface according to claim 1, characterized in that: Also includes: A guardrail (8); the guardrail (8) is arranged at the upper edge of the hydraulic platform (2) and is fixedly connected to the hydraulic platform (2) to limit the position of heavy objects.

9. The hydraulic lifting platform with a movable load-bearing surface according to claim 8, characterized in that: Also includes: Two sets of protective devices; the two sets of protective devices are symmetrically arranged on both sides of the hydraulic platform (2) and are used to prevent heavy objects from moving through the gap of the guardrail (8).

10. The hydraulic lifting platform with a movable load-bearing surface according to claim 9, characterized in that: Each set of protective devices includes: protective box (24); A turntable (25) is arranged inside the protection box (24) and is rotatably connected to the protection box (24); a cylindrical pin is provided on the upper end surface of the turntable (25); a second motor (26), wherein an output end of the second motor (26) is fixedly connected to the axis of the turntable (25); A slot plate (27), the slot plate (27) passes through a corresponding position of the protection box (24) and is slidably connected to the protection box (24); a sliding groove is provided on the surface of the slot plate (27), so that the cylindrical pin is located in the sliding groove and is slidably connected to the cylindrical pin through the sliding groove; A guardrail plate (28) is fixedly connected to one end of the trough plate (27); one side of the guardrail plate (28) is in contact with the guardrail (8).

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