H-shaped lifting mechanism

Abstract

The utility model discloses an H-shaped lifting mechanism which comprises a left supporting plate and a right supporting plate, a left baffle frame is fixedly installed on the upper side of the left supporting plate, a plurality of fixed handles are fixedly installed on the left side wall of the left baffle frame so that a trolley can be conveniently moved, and a right baffle frame is fixedly installed on the upper side of the right supporting plate. The lower side of the left supporting plate and the lower side of the right supporting plate are each fixedly provided with two universal wheels, the rear side of the left baffle frame is provided with a movable baffle assembly, the upper side of the right baffle frame is rotationally connected with a cross beam through a rotating shaft, the middle side of the cross beam is provided with a middle moving assembly, and the left side of the cross beam is arranged on the lower side of the left baffle frame. An overturning assembly is arranged on the left side of the cross beam, and an open groove is formed in the middle side of the cross beam. A traditional crank sliding block mechanism is changed into the H-shaped sliding frame, the connecting plate and the special-shaped rotating rod to form a lever structure, and compared with a traditional crank sliding block mechanism, the crank sliding block mechanism is not prone to abrasion, deformation and damage.

Description

Technical Field

[0001] The utility model relates to the technical field of lifting mechanisms, in particular to an H-type lifting mechanism. Background Art

[0002] The six-wheeled logistics trolley is a unit mobile container equipment equipped with six casters for transporting and storing materials. It is often used in logistics distribution in large supermarkets or logistics turnover between factory processes. A lifting mechanism is usually used to lift the middle wheel to facilitate the lateral movement of the trolley.

[0003] Patent No. CN201921126239.8 proposes a six-wheel vehicle lifting and lowering mechanism, including a base plate, two base plate hardware welded at one end of the base plate, the end of the base plate hardware away from the base plate is rotatably connected to the right plate by a fixing bolt, the bottom of the right plate is fixedly connected to the right plate base, the corresponding sides of the base plate hardware are fixedly connected to a connecting pipe assembly, the end of the connecting pipe assembly away from the base plate hardware is connected to a plug-in hardware, and one side of the plug-in hardware is welded to a base frame, which is highly practical. By using a split base frame, a crank slider mechanism is used to raise one side of the base frame, so that the two wheels in the middle for fixing are moved up, and six wheels are changed into four universal wheels, thereby obtaining lateral freedom and simplifying the action at the same time. The structure of the crank slider mechanism is subjected to large stress and is prone to wear, deformation and damage. Therefore, those skilled in the art provide an H-type lifting mechanism to solve the problem that the structure of the crank slider mechanism is subjected to large stress and is prone to wear, deformation and damage. Utility Model Content

[0004] The purpose of the utility model is to provide an H-shaped lifting mechanism to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] The H-type lifting mechanism includes a left support plate and a right support plate, wherein a left baffle frame is fixedly installed on the upper side of the left support plate, and a plurality of fixed handles are fixedly installed on the left side wall of the left baffle frame to facilitate the movement of the trolley, a right baffle frame is fixedly installed on the upper side of the right support plate, and two universal wheels are fixedly installed on the lower sides of the left support plate and the right support plate, a movable baffle assembly is installed on the rear side of the left baffle frame, a crossbeam is rotatably connected to the upper side of the right support plate through a rotating shaft, a middle moving assembly is installed on the middle side of the crossbeam, the left side of the crossbeam is arranged on the lower side of the left baffle frame, a flip assembly is arranged on the left side of the crossbeam, and a slot is arranged on the middle side of the crossbeam.

[0007] As a further solution of the utility model: the flip assembly includes: an H-shaped sliding frame, a connecting plate, a plastic base plate, a special-shaped rotating rod and a locking handle, the H-shaped sliding frame is slidably connected to the lower side of the left baffle frame, the two connecting plates are rotatably connected to the front and rear side walls of the H-shaped sliding frame through a rotating shaft, the plastic base plate is fixedly installed on the upper side of the connecting plate, each of the connecting plates is rotatably connected to a special-shaped rotating rod on the lower side through a rotating shaft, the end of the special-shaped rotating rod away from the connecting plate is rotatably connected to the lower side of the left baffle frame through a rotating shaft, the locking handle is rotatably connected to the upper side of the left baffle frame through a rotating shaft, and a groove is provided on the upper side of the plastic base plate for accommodating the locking handle to lock the plastic base plate.

[0008] As a further solution of the utility model: the middle moving component includes: a middle support plate, a fixed wheel and a buffer frame, the middle support plate is fixedly installed on the middle side of the crossbeam, the two fixed wheels are fixedly installed symmetrically front and back along the central axis of the middle support plate on the lower side of the middle support plate, and the two buffer frames are fixedly installed symmetrically front and back along the central axis of the middle support plate on the front and rear sides of the middle support plate.

[0009] As a further solution of the utility model: the movable baffle assembly includes: a middle baffle frame, a sliding extension plate, a limiting screw and a fixing pin. The right side of the middle baffle frame is rotatably connected to the right baffle frame through a rotating shaft, and the sliding extension plate is slidably connected to the left side of the middle baffle frame. A strip slot is provided on the middle side of the sliding extension plate, and the limiting screw passes through the strip slot and is fixedly installed on the middle baffle frame. The end of the sliding extension plate away from the middle baffle frame is slidably connected to the left baffle frame, and an opening is provided on the left baffle frame. One end of the fixing pin is slidably connected to the opening, and the other end of the fixing pin is fixedly connected to the side wall of the sliding extension plate. The lower side of the middle baffle frame is fixedly installed on the upper side of the crossbeam through a bracket to improve the stability of the plastic bottom plate. Multiple openings are provided on the right side of the middle baffle frame to accommodate the right baffle bracket, which is convenient for stacking trolleys.

[0010] As a further solution of the utility model: a linkage assembly is installed on the middle support plate.

[0011] As a further solution of the utility model: the linkage assembly includes: an L-shaped plate, a rotating plate, a first transmission rod, a tension spring and a rotating disc, the L-shaped plate is rotatably connected to the middle side of the middle support plate through a rotating shaft, the rotating plate is rotatably connected to the right side of the L-shaped plate through a rotating shaft, the first transmission rod is fixedly mounted on the end of the rotating plate away from the L-shaped plate, one end of the two tension springs are symmetrically fixedly connected to the front and rear ends of the first transmission rod along the central axis of the first transmission rod, the other end of each of the tension springs is fixedly connected to the fixed wheel, and a rotating disc is fixedly connected to the side of the rotating shaft of each fixed wheel close to the central axis of the crossbeam, a plurality of slots are arranged on the rotating disc, and the two ends of the first transmission rod are arranged in the slots.

[0012] As a further solution of the utility model: a pedal assembly is installed on the upper side of the left support plate.

[0013] As a further solution of the present utility model: the foot pedal assembly includes: a fixed frame, a pull rod, a second transmission rod, a fixed bracket, a locking plate, an unlocking plate and a torsion spring, the fixed frame is fixedly installed on the upper side of the left support plate, the pull rod is slidably connected to the groove on the middle side of the crossbeam, one end of the second transmission rod is fixedly connected to the left side of the pull rod, the right side of the pull rod is close to the L-shaped plate, the fixed bracket is fixedly installed on the left support plate, the locking plate is rotatably connected to the fixed bracket through a rotating shaft, the other end of the second transmission rod is fixedly connected to the lower side of the locking plate, the unlocking plate is rotatably connected to the fixed bracket through a rotating shaft, a torsion spring is provided on the rotating shafts of the locking plate and the unlocking plate, one end of the torsion spring is fixedly connected to the fixed bracket, and the other end of the torsion spring is fixedly connected to the side walls of the locking plate and the unlocking plate, a limiting shaft is fixedly installed on the locking plate, and two upper and lower grooves are provided on the left side of the unlocking plate for accommodating the limiting shaft.

[0014] Compared with the prior art, the beneficial effects of the utility model are as follows: the H-shaped lifting mechanism drives the connecting plate to rotate to the left by rotating the plastic bottom plate to the left, and the connecting plate drives the special-shaped rotating rod to rotate to the right by rotating the connecting plate to the left, and the end of the special-shaped rotating rod away from the connecting plate is rotatably connected to the lower side of the left baffle frame through the rotating shaft, and the special-shaped rotating rod rotates to the right so that the connecting plate rotates and moves upward at the same time, and the upward movement of the connecting plate drives the H-shaped sliding frame to move upward, and the upward movement of the H-shaped sliding frame drives the left side of the crossbeam to move upward, and the locking handle is turned to the right, and the locking handle is pressed against the groove on the upper side of the plastic bottom plate to fix the plastic bottom plate, which is conducive to quickly folding the plastic bottom plate and facilitating stacking between trolleys, and the H-shaped sliding frame, the connecting plate and the special-shaped rotating rod are connected to each other. The transmission between the two wheels makes it less likely to be worn, deformed and damaged; the left side of the crossbeam moves upward, driving the middle support plate to move upward, and the middle support plate moves upward, driving the two fixed wheels to move upward, which is beneficial to lifting the fixed wheels and facilitating the horizontal movement of the trolley for stacking; the left side of the crossbeam moves upward, driving the middle baffle frame to rotate to the upper left, and the end of the sliding extension plate close to the middle baffle frame rotates downward and slides to the right at the same time, and the end of the sliding extension plate close to the left baffle frame rotates to the right and slides upward at the same time, which is beneficial for the middle baffle frame to rotate with the crossbeam, and at the same time improves the stability of the plastic bottom plate load-bearing. The utility model transforms the traditional crank slider mechanism into an H-shaped sliding frame, a connecting plate and a special-shaped rotating rod to form a lever structure, which is less likely to be worn, deformed and damaged than the traditional one. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The three-dimensional structure of the present invention is shown in FIG. Figure 1 ;

[0016] Figure 2 for Figure 1A magnified view of middle;

[0017] Figure 3 It is a front view of the present invention;

[0018] Figure 4 The three-dimensional structure of the present invention in a folded state is shown in FIG. Figure 1 ;

[0019] Figure 5 The three-dimensional structure of the present invention in a folded state is shown in FIG. Figure 2 ;

[0020] Figure 6 for Figure 5 Enlarged view of middle B;

[0021] Figure 7 The three-dimensional structure of the present invention is shown in FIG. Figure 2 ;

[0022] Figure 8 for Figure 7 Enlarged view of middle C;

[0023] Fig. 9 It is a cross-sectional view of the linkage assembly of the present invention;

[0024] Fig.10 It is a structural schematic diagram of the pedal assembly of the present invention;

[0025] Fig.11 is a cross-sectional view of a footrest assembly of the present invention;

[0026] Fig.12 It is a structural schematic diagram of a plurality of devices in a stacked state according to the present invention.

[0027] In the figure: 1. left support plate; 2. right support plate; 3. left baffle frame; 4. right baffle frame; 5. movable baffle assembly; 51. middle baffle frame; 52. sliding extension plate; 53. limiting screw; 54. fixing pin; 6. crossbeam; 7. middle moving assembly; 71. middle support plate; 72. fixed wheel; 8. flip assembly; 81. H-shaped sliding frame; 82. connecting plate; 83. plastic bottom plate; 84. special-shaped rotating rod; 85. locking handle; 9. linkage assembly; 91. L-shaped plate; 92. rotating plate; 93. first transmission rod; 94. tension spring; 95. rotating disc; 10. pedal assembly; 11. fixed frame; 12. pull rod; 13. second transmission rod; 14. fixed bracket; 15. locking plate; 16. unlocking plate; 17. limiting shaft. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] See also Figures 1 to 12 In the embodiment of the utility model, the H-shaped lifting mechanism includes a left support plate 1 and a right support plate 2. A left baffle frame 3 is fixedly installed on the upper side of the left support plate 1. A plurality of fixed handles are fixedly installed on the left side wall of the left baffle frame 3 to facilitate the movement of the trolley. A right baffle frame 4 is fixedly installed on the upper side of the right support plate 2. Two universal wheels are fixedly installed on the lower sides of the left support plate 1 and the right support plate 2. A movable baffle assembly 5 is installed on the rear side of the left baffle frame 3. A crossbeam 6 is rotatably connected to the upper side of the right support plate 2 through a rotating shaft. A middle moving assembly 7 is installed on the middle side of the crossbeam 6. The left side of the crossbeam 6 is arranged on the lower side of the left baffle frame 3. A flip assembly 8 is arranged on the left side of the crossbeam 6. A slot is arranged on the middle side of the crossbeam 6.

[0030] The flip assembly 8 includes: an H-shaped sliding frame 81, a connecting plate 82, a plastic bottom plate 83, a special-shaped rotating rod 84 and a locking handle 85. The H-shaped sliding frame 81 is slidably connected to the lower side of the left baffle frame 3. The two connecting plates 82 are rotatably connected to the front and rear side walls of the H-shaped sliding frame 81 through a rotating shaft. The plastic bottom plate 83 is fixedly installed on the upper side of the connecting plate 82. The lower side of each connecting plate 82 is rotatably connected to a special-shaped rotating rod 84 through a rotating shaft. The end of the special-shaped rotating rod 84 away from the connecting plate 82 is rotatably connected to the lower side of the left baffle frame 3 through a rotating shaft. The locking handle 85 is rotatably connected to the upper side of the left baffle frame 3 through a rotating shaft. A slot is provided on the upper side of the plastic bottom plate 83 to accommodate the locking handle 85 to lock the plastic bottom plate 83.

[0031] The plastic bottom plate 83 rotates to the left, driving the connecting plate 82 to rotate to the left. The connecting plate 82 rotates to the left, driving the special-shaped rotating rod 84 to rotate to the right. The end of the special-shaped rotating rod 84 away from the connecting plate 82 is connected to the lower side of the left baffle frame 3 by rotating the shaft. The special-shaped rotating rod 84 rotates to the right, causing the connecting plate 82 to rotate and move upward at the same time. The connecting plate 82 moves upward, driving the H-shaped sliding frame 81 to move upward, and the H-shaped sliding frame 81 moves upward, driving the left side of the crossbeam 6 to move upward. The locking handle 85 is turned to the right, and the locking handle 85 is pressed against the slot on the upper side of the plastic bottom plate 83 to fix the plastic bottom plate 83, which is conducive to quickly folding the plastic bottom plate 83 and stacking between trolleys.

[0032] The middle moving assembly 7 includes: a middle support plate 71, a fixed wheel 72 and a buffer frame, the middle support plate 71 is fixedly mounted on the middle side of the crossbeam 6, two fixed wheels 72 are fixedly mounted on the lower side of the middle support plate 71 symmetrically along the central axis of the middle support plate 71, and two buffer frames are fixedly mounted on the front and rear sides of the middle support plate 71 symmetrically along the central axis of the middle support plate 71;

[0033] The left side of the crossbeam 6 moves upward, driving the middle support plate 71 to move upward, and the middle support plate 71 moves upward, driving the two fixed wheels 72 to move upward, which is conducive to lifting the fixed wheels 72 and facilitating the transverse movement of the trolley for stacking;

[0034] The movable baffle assembly 5 includes: a middle baffle frame 51, a sliding extension plate 52, a limiting screw 53 and a fixing pin 54. The right side of the middle baffle frame 51 is rotatably connected to the right baffle frame 4 through a rotating shaft, and the sliding extension plate 52 is slidably connected to the left side of the middle baffle frame 51. A strip slot is provided on the middle side of the sliding extension plate 52. The limiting screw 53 penetrates the strip slot and is fixedly installed on the middle baffle frame 51. The end of the sliding extension plate 52 away from the middle baffle frame 51 is slidably connected to the left baffle frame 3. The left baffle frame 3 is provided with an opening. One end of the fixing pin 54 is slidably connected to the opening, and the other end of the fixing pin 54 is fixedly connected to the side wall of the sliding extension plate 52. The lower side of the middle baffle frame 51 is fixedly installed on the upper side of the crossbeam 6 through a bracket to improve the stability of the plastic bottom plate 83. A plurality of openings are provided on the right side of the middle baffle frame 51 to accommodate the right baffle bracket for facilitating the stacking of the trolleys.

[0035] The left side of the cross beam 6 moves upward to drive the middle baffle frame 51 to rotate to the upper left, and the end of the sliding extension plate 52 close to the middle baffle frame 51 rotates downward and slides to the right at the same time, and the end of the sliding extension plate 52 close to the left baffle frame 3 rotates to the right and slides upward at the same time, which is conducive to the middle baffle frame 51 to rotate with the cross beam 6, and at the same time improves the bearing stability of the plastic bottom plate 83;

[0036] A linkage assembly 9 is installed on the middle support plate 71;

[0037] The linkage assembly 9 includes: an L-shaped plate 91, a rotating plate 92, a first transmission rod 93, a tension spring 94 and a rotating disc 95. The L-shaped plate 91 is rotatably connected to the middle side of the middle support plate 71 through a rotating shaft, and the rotating plate 92 is rotatably connected to the right side of the L-shaped plate 91 through a rotating shaft. The first transmission rod 93 is fixedly installed on the end of the rotating plate 92 away from the L-shaped plate 91, and one end of two tension springs 94 is symmetrically fixedly connected to the front and rear ends of the first transmission rod 93 along the central axis of the first transmission rod 93. The other end of each tension spring 94 is fixedly connected to the fixed wheel 72, and a rotating disc 95 is fixedly connected to the side of the rotating shaft of each fixed wheel 72 close to the central axis of the crossbeam 6. A plurality of slots are provided on the rotating disc 95, and the two ends of the first transmission rod 93 are arranged in the slots;

[0038] The L-shaped plate 91 rotates to the left to drive the rotating plate 92 to move upward, and the rotating plate 92 moves upward to drive the first transmission rod 93 to move upward, the tension spring 94 is stretched, and the first transmission rod 93 moves upward to make the first transmission rod 93 leave the slot of the rotating disc 95, so that the rotating disc 95 can be rotated, so that the fixed wheel 72 leaves the braking state, which is conducive to quickly closing or opening the fixed wheel 72;

[0039] A footrest assembly 10 is installed on the upper side of the left support plate 1;

[0040] The pedal assembly 10 includes: a fixed frame 11, a pull rod 12, a second transmission rod 13, a fixed bracket 14, a locking plate 15, an unlocking plate 16 and a torsion spring. The fixed frame 11 is fixedly installed on the upper side of the left support plate 1, the pull rod 12 is slidably connected in the slot on the middle side of the cross beam 6, one end of the second transmission rod 13 is fixedly connected to the left side of the pull rod 12, and the right side of the pull rod 12 is close to the L-shaped plate 91, the fixed bracket 14 is fixedly installed on the left support plate 1, the locking plate 15 is rotatably connected to the fixed bracket 14 through a rotating shaft, the other end of the second transmission rod 13 is fixedly connected to the lower side of the locking plate 15, and the unlocking plate 16 is rotatably connected to the fixed bracket 14 through a rotating shaft, and a torsion spring is provided on the rotating shafts of the locking plate 15 and the unlocking plate 16, one end of the torsion spring is fixedly connected to the fixed bracket 14, and the other end of the torsion spring is fixedly connected to the side walls of the locking plate 15 and the unlocking plate 16, a limiting shaft 17 is fixedly installed on the locking plate 15, and two upper and lower grooves are provided on the left side of the unlocking plate 16 for accommodating the limiting shaft 17;

[0041] The locking plate 15 rotates to the lower left, driving the second transmission rod 13 to move to the upper right. At the same time, the limiting shaft 17 on the locking plate 15 moves to the lower left and enters the groove on the lower side of the unlocking plate 16. The torsion spring on the rotating shaft of the locking plate 15 is elastically deformed, and the locking plate 15 is fixed. The second transmission rod 13 moves to the upper right, driving the pull rod 12 to move to the right. The pull rod 12 moves to the right, so that the L-shaped plate 91 is loosened. The L-shaped plate 91 rotates to the right, driving the rotating plate 92 to move downward. The rotating plate 92 moves downward, driving the first transmission rod 93 to move downward. The first transmission rod 93 moves downward, so that the first transmission rod 93 is tightly attached to the groove of the rotating disk 95, so that the rotating disk 95 is locked, and the fixed wheel 72 enters the braking state. The unlocking plate 16 rotates to the lower left so that the limiting shaft 17 on the locking plate 15 leaves the groove on the lower side of the unlocking plate 16 and enters the groove on the upper side of the unlocking plate 16. The torsion spring on the rotating shaft of the locking plate 15 recovers and pushes the locking plate 15 back to the initial position, so that the second transmission rod 13 moves to the left. The second transmission rod 13 moves to the left and drives the pull rod 12 to move to the left, which can quickly lock the fixed wheel 72. A quick single-foot press operation is conducive to quickly closing or opening the fixed wheel 72.

[0042] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An H-type lifting mechanism, comprising a left support plate (1) and a right support plate (2), characterized in that: A left baffle frame (3) is fixedly installed on the upper side of the left support plate (1), and a plurality of fixed handles are fixedly installed on the left side wall of the left baffle frame (3); a right baffle frame (4) is fixedly installed on the upper side of the right support plate (2); two universal wheels are fixedly installed on the lower sides of the left support plate (1) and the right support plate (2); a movable baffle assembly (5) is installed on the rear side of the left baffle frame (3); a crossbeam (6) is rotatably connected to the upper side of the right support plate (2) via a rotating shaft; a middle moving assembly (7) is installed on the middle side of the crossbeam (6); the left side of the crossbeam (6) is arranged on the lower side of the left baffle frame (3); and a flip assembly (8) is arranged on the left side of the crossbeam (6).

2. The H-type lifting mechanism according to claim 1, characterized in that: The flip assembly (8) comprises: an H-shaped sliding frame (81), a connecting plate (82), a plastic bottom plate (83), a special-shaped rotating rod (84) and a locking handle (85); the H-shaped sliding frame (81) is slidably connected to the lower side of the left baffle frame (3); the two connecting plates (82) are rotatably connected to the front and rear side walls of the H-shaped sliding frame (81) via a rotating shaft; the plastic bottom plate (83) is fixedly installed on the upper side of the connecting plate (82); the lower side of each connecting plate (82) is rotatably connected to a special-shaped rotating rod (84) via a rotating shaft; one end of the special-shaped rotating rod (84) away from the connecting plate (82) is rotatably connected to the lower side of the left baffle frame (3) via a rotating shaft; and the locking handle (85) is rotatably connected to the upper side of the left baffle frame (3) via a rotating shaft.

3. The H-type lifting mechanism according to claim 2, characterized in that: The middle moving assembly (7) comprises: a middle supporting plate (71), a fixed wheel (72) and a buffer frame, wherein the middle supporting plate (71) is fixedly mounted on the middle side of the crossbeam (6), the two fixed wheels (72) are fixedly mounted on the lower side of the middle supporting plate (71) symmetrically along the central axis of the middle supporting plate (71), and the two buffer frames are fixedly mounted on the front and rear sides of the middle supporting plate (71) symmetrically along the central axis of the middle supporting plate (71).

4. The H-type lifting mechanism according to claim 3, characterized in that: The movable baffle assembly (5) includes: a middle baffle frame (51), a sliding extension plate (52), a limiting screw (53) and a fixing pin (54); the right side of the middle baffle frame (51) is rotatably connected to the right baffle frame (4) via a rotating shaft; the sliding extension plate (52) is slidably connected to the left side of the middle baffle frame (51); a strip slot is provided on the middle side of the sliding extension plate (52); the limiting screw (53) passes through the strip slot and is fixedly installed on the middle baffle frame (51); one end of the sliding extension plate (52) away from the middle baffle frame (51) is slidably connected to the left baffle frame (3); an opening is provided on the left baffle frame (3); one end of the fixing pin (54) is slidably connected to the opening; the other end of the fixing pin (54) is fixedly connected to the side wall of the sliding extension plate (52); the lower side of the middle baffle frame (51) is fixedly installed on the upper side of the crossbeam (6) via a bracket.

5. The H-type lifting mechanism according to claim 4, characterized in that: A linkage assembly (9) is installed on the middle support plate (71).

6. The H-type lifting mechanism according to claim 5, characterized in that: The linkage assembly (9) comprises: an L-shaped plate (91), a rotating plate (92), a first transmission rod (93), a tension spring (94) and a rotating disc (95); the L-shaped plate (91) is rotatably connected to the middle side of the middle support plate (71) via a rotating shaft; the rotating plate (92) is rotatably connected to the right side of the L-shaped plate (91) via a rotating shaft; the first transmission rod (93) is fixedly mounted on one end of the rotating plate (92) away from the L-shaped plate (91); one end of the two tension springs (94) is symmetrically fixedly connected to the front and rear ends of the first transmission rod (93) along the central axis of the first transmission rod (93); the other end of each tension spring (94) is fixedly connected to the fixed wheel (72); and a rotating disc (95) is fixedly connected to one side of the rotating shaft of each fixed wheel (72) close to the central axis of the crossbeam (6).

7. The H-type lifting mechanism according to claim 6, characterized in that: A footrest assembly (10) is installed on the upper side of the left support plate (1).

8. The H-type lifting mechanism according to claim 7, characterized in that: The pedal assembly (10) comprises: a fixed frame (11), a pull rod (12), a second transmission rod (13), a fixed bracket (14), a locking plate (15), an unlocking plate (16) and a torsion spring, wherein the fixed frame (11) is fixedly mounted on the upper side of the left support plate (1), the pull rod (12) is slidably connected in a slot on the middle side of the crossbeam (6), one end of the second transmission rod (13) is fixedly connected to the left side of the pull rod (12), the right side of the pull rod (12) is tightly attached to the L-shaped plate (91), and the fixed bracket (14) is fixedly mounted on the left support plate (1). The locking plate (15) is rotatably connected to the fixed bracket (14) via a rotating shaft, the other end of the second transmission rod (13) is fixedly connected to the lower side of the locking plate (15), the unlocking plate (16) is rotatably connected to the fixed bracket (14) via a rotating shaft, a torsion spring is arranged on the rotating shafts of the locking plate (15) and the unlocking plate (16), one end of the torsion spring is fixedly connected to the fixed bracket (14), the other end of the torsion spring is fixedly connected to the side wall of the locking plate (15) and the unlocking plate (16), and a limiting shaft (17) is fixedly installed on the locking plate (15).

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