Brake system and trolley

Abstract

The utility model relates to the technical field of brake systems, and provides a brake system and a trolley. Comprising a supporting seat, a rotating table, a notch, wheels, a sliding channel and a sliding part, wherein the rotating table is arranged at the bottom of the supporting seat and rotates around a preset axis; the notch is formed in the rotating table; the wheels are rotatably arranged at the bottom of the rotating table; the first braking part is arranged on the sliding part; the driving mechanism is used for driving the sliding part to slide; the sliding piece can slide between a first position and a second position; when the sliding piece is located at the first position, the first braking piece can be clamped in the notch; when the sliding piece is located at the second position, the first braking piece is located on the outer side of the notch.

Description

Technical Field

[0001] The utility model belongs to the technical field of braking systems, and more specifically, relates to a braking system and a trolley. Background Art

[0002] In modern means of transportation, movement and support are often achieved through wheels. To brake the wheels, it is usually realized by brake pads. However, the brake pads usually brake the self-rotation of the wheels, and the brake pads cannot brake the steering of the wheels. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a braking system to solve the technical problem that the brake pads in the prior art cannot brake the steering of the wheels.

[0004] To achieve the above purpose, the technical solution adopted by the utility model is: to provide a braking system, including: a support base, a rotating table rotatably arranged at the bottom of the support base around a predetermined axis, a notch arranged on the rotating table, a wheel rotatably arranged at the bottom of the rotating table, a sliding channel arranged on the support base, a sliding member slidably arranged in the sliding channel, a first braking member arranged on the sliding member, and a driving mechanism for driving the sliding member to slide; the sliding member can slide between a first position and a second position; when the sliding member is located at the first position, the first braking member can be clamped in the notch; when the sliding member is located at the second position, the first braking member is located outside the notch.

[0005] Further, the first braking member is a spring piece.

[0006] Further, the spring piece is in an S shape.

[0007] Further, the predetermined axis is vertically arranged.

[0008] Further, the sliding channel is a chute arranged on the support base, and the chute extends along a predetermined straight line.

[0009] Further, it further includes: a second braking member, a transmission mechanism, and a brake disc arranged on the support base; the second braking member is rotatably arranged on the rotating table through a rotating shaft; the sliding member can drive the second braking member to rotate through the transmission mechanism; the second braking member can be switched between a first rotating position and a second rotating position;

[0010] When the sliding member slides to the first position, the sliding member drives the second braking member to rotate to the first rotating position, the wheel and the second braking member are arranged at intervals, and the brake disc and the second braking member are arranged at intervals;

[0011] When the sliding member slides to the second position, the sliding member drives the second braking member to rotate to the second rotation position, the wheel contacts the second braking member, and the brake disc contacts the second braking member.

[0012] Further, the transmission mechanism comprises: a cylinder provided on the support seat and having a sliding channel, a rod body passing through the sliding channel and capable of sliding along the sliding channel, and an elastic member connecting the second brake member and the rotating platform;

[0013] The second brake member has a first end and a second end respectively located on both sides of the rotating shaft; the rod body is located between the sliding member and the first end, and the elastic member drives the first end to abut against the rod body so that the rod body is clamped between the sliding member and the first end;

[0014] A boss portion is provided on the sliding member; when the sliding member slides to the first position, the sliding member abuts against the rod body, and the second brake member is located at the first rotation position; when the sliding member moves to the second position, the boss portion abuts against the rod body, and the boss portion pushes the second brake member from the first rotation position to the second rotation position through the rod body.

[0015] Furthermore, the first end has a first braking portion adapted to the shape of the outer surface of the wheel; when the second braking member rotates to the second rotation position, the first braking portion abuts against the outer surface of the wheel.

[0016] Furthermore, the brake disc has a plurality of brake grooves on its surface, and the second end has a second brake portion; when the second brake member rotates to the second rotation position, the second brake portion is clamped in the brake groove; when the second brake member rotates to the first rotation position, the second brake portion is pulled out of the brake groove.

[0017] The utility model also provides a trolley, comprising: a load-bearing plate and a brake system; the driving mechanism comprises: a rotating rod rotatably arranged on the bottom surface of the load-bearing plate, a rotating member arranged on the surface of the rotating rod, and a connecting rod; the support seat is arranged at the bottom of the load-bearing plate; one end of the connecting rod is hinged on the rotating member, and the other end of the connecting rod is hinged on the sliding member.

[0018] The beneficial effects of the braking system provided by the present utility model are as follows: Compared with the prior art, for the braking system provided by the present utility model, the rotating table is arranged at the bottom of the support seat, and the rotating table can rotate relative to the support seat around a predetermined axis; wheels are arranged at the bottom of the rotating table, and the support seat can move on the ground through the wheels; a sliding channel is arranged on the support seat, a sliding member is slidably arranged in the sliding channel, and the sliding member can slide between a first position and a second position; a first braking member is arranged on the sliding member, and when the sliding member slides, the first braking member can be driven to move; there is a notch on the rotating table; when the sliding member slides to the first position, the first braking member can be clamped in the notch to brake the rotating table, and the first braking member can prevent the rotating table from rotating relative to the support seat, that is, the first braking member can prevent the wheels from rotating along with the rotating table; when the sliding member slides to the second position, the first braking member moves to the outside of the notch, and the first braking member cancels the braking of the rotating table; that is, by switching the sliding member between the first position and the second position, the steering braking of the rotating table (and the wheels on the rotating table) can be carried out, which is very convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 Stereoscopic schematic diagram of the trolley provided by the embodiment of the present utility model Figure 1 ;

[0021] Figure 2 Front view schematic diagram of the trolley provided by the embodiment of the present utility model;

[0022] Figure 3 Bottom view schematic diagram of the trolley provided by the embodiment of the present utility model;

[0023] Figure 4 For Figure 3 Sectional view A - A in

[0024] Figure 5 For Figure 4 Enlarged view of part B in

[0025] Figure 6 Stereoscopic schematic diagram of the trolley (hiding the load - bearing plate) provided by the embodiment of the present utility model;

[0026] Figure 7 For Figure 6 Enlarged view of part C in

[0027] Figure 8Schematic three-dimensional view of the assembly of the sliding member, the first braking member and the boss portion provided by the embodiment of the present utility model;

[0028] Figure 9 Schematic three-dimensional view of the braking system (with the sliding member, the first braking member and the boss portion hidden) provided by the embodiment of the present utility model Figure 1 ;

[0029] Figure 10 Schematic three-dimensional view of the braking system (with the sliding member, the first braking member and the boss portion hidden) provided by the embodiment of the present utility model Figure 2 ;

[0030] Figure 11 Schematic three-dimensional view of the assembly of the support seat, the cylinder and the brake disc provided by the embodiment of the present utility model Figure 1 ;

[0031] Figure 12 Schematic three-dimensional view of the assembly of the support seat, the cylinder and the brake disc provided by the embodiment of the present utility model Figure 2 ;

[0032] Figure 13 Schematic three-dimensional view of the cylinder provided by the embodiment of the present utility model;

[0033] Figure 14 Schematic three-dimensional view of the assembly of the second braking member, the rotating shaft, the elastic member and the rod body provided by the embodiment of the present utility model;

[0034] Figure 15 Schematic three-dimensional view of the assembly of the second braking member, the rotating shaft and the elastic member provided by the embodiment of the present utility model;

[0035] Figure 16 Schematic three-dimensional view of the rod body provided by the embodiment of the present utility model;

[0036] Figure 17 Schematic three-dimensional view of the cooperation between the partial rotating table and the first braking member provided by the embodiment of the present utility model Figure 1 ;

[0037] Figure 18 Schematic three-dimensional view of the cooperation between the partial rotating table and the first braking member provided by the embodiment of the present utility model Figure 2 ;

[0038] Figure 19 Schematic three-dimensional view of the cooperation between the brake disc and the second braking member provided by the embodiment of the present utility model;

[0039] Figure 20 Schematic three-dimensional view of the trolley provided by the embodiment of the present utility model Figure 2 ;

[0040] Figure 21 ForFigure 20 Enlarged view of part D

[0041] Among them, the reference numerals in the figure are as follows:

[0042] 1 - support base; 2 - rotating table; 21 - notch; 22 - sliding channel; 3 - wheel; 41 - sliding member; 42 - convex part; 43 - first braking member; 5 - driving mechanism; 51 - rotating rod; 52 - rotating member; 53 - connecting rod; 54 - rotating piece; 61 - second braking member; 611 - first end; 6111 - first braking part; 612 - second end; 6121 - second braking part; 62 - transmission mechanism; 621 - cylinder body; 6211 - sliding hole; 622 - rod body; 623 - elastic member; 63 - brake disc; 631 - brake groove; 64 - rotating shaft; 65 - rivet; 7 - load-bearing plate; 81 - first support plate; 82 - second support plate; 83 - first annular limiting rib; 84 - second annular limiting rib; 85 - first ball; 86 - second ball; 87 - first screw; 881 - second screw; 882 - nut Specific embodiments

[0043] It should be noted that the specific embodiments are only used to explain the present invention and are not used to limit the present invention

[0044] It should be noted that in the description of the embodiments of the present application, unless otherwise specified, " / " means "or", for example, A / B can mean A or B; herein, "and / or" is only a description of the relationship between associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. Among them, A and B can be singular or plural respectively

[0045] It should be noted that when an element is referred to as "fixed on" or "arranged on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" or "connected on" another element, it can be directly connected to the other element or indirectly connected to the other element. When an element is referred to as "fixed to" or "arranged on" another element, it can be directly on the other element or indirectly on the other element

[0046] It should be noted that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is 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 a limitation to the present invention

[0047] It should be noted that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0048] It should be noted that the meaning of the term "a plurality of" is two or more, unless otherwise specifically defined.

[0049] Please refer to Figures 1 to 21 together. Now, the braking system provided by the present utility model will be described. The braking system includes: a support base 1, a rotating table 2 rotatably arranged at the bottom of the support base 1 around a predetermined axis, a notch 21 arranged on the rotating table 2, a wheel 3 rotatably arranged at the bottom of the rotating table 2, a sliding channel 22 arranged on the support base 1, a sliding member 41 slidably arranged in the sliding channel 22, a first braking member 43 arranged on the sliding member 41, and a driving mechanism 5 for driving the sliding member 41 to slide; the sliding member 41 can slide between a first position and a second position; when the sliding member 41 is located at the first position, the first braking member 43 can be clamped in the notch 21; when the sliding member 41 is located at the second position, the first braking member 43 is located outside the notch 21.

[0050] In this way, the rotating table 2 is arranged at the bottom of the support base 1, and the rotating table 2 can rotate relative to the support base 1 around a predetermined axis; the bottom of the rotating table 2 is provided with a wheel 3, and the support base 1 can move on the ground through the wheel 3; the support base 1 is provided with a sliding channel 22, the sliding member 41 is slidably arranged in the sliding channel 22, and the sliding member 41 can slide between a first position and a second position; the sliding member 41 is provided with a first braking member 43, and the first braking member 43 can be driven to move when the sliding member 41 slides; the rotating table 2 has a notch 21; when the sliding member 41 slides to the first position, the first braking member 43 can be clamped in the notch 21 and brake the rotating table 2, and the first braking member 43 can prevent the rotating table 2 from rotating relative to the support base 1, that is, the first braking member 43 can prevent the wheel 3 from rotating along with the rotating table 2; when the sliding member 41 slides to the second position, the first braking member 43 moves outside the notch 21, and the first braking member 43 cancels the braking of the rotating table 2; that is, by switching the sliding member 41 between the first position and the second position, the steering braking of the rotating table 2 (and the wheel 3 on the rotating table 2) can be carried out, which is very convenient.

[0051] In one embodiment, the wheel 3 is rotatably arranged on the rotating table 2 around a horizontal axis.

[0052] In one embodiment, the orientation of the notch 21 is: the radially outward direction of the predetermined axis.

[0053] In one embodiment, the sliding channel 22 can be a groove or a duct provided on the support base 1. In one embodiment, the sliding member 41 is rod-shaped with the same cross-section as the sliding channel 22.

[0054] In one embodiment, the number of notches 21 is multiple. In one embodiment, the multiple notches 21 are arranged around the outside of the predetermined axis.

[0055] In one embodiment, a first support plate 81 and a second support plate 82 are provided on the top surface of the support base 1, and the sliding channel 22 is formed between the first support plate 81 and the second support plate 82.

[0056] In one embodiment, the load-bearing plate 7 is supported on the first support plate 81 and the second support plate 82.

[0057] In one embodiment, the drive mechanism 5 can be a cylinder or a motor.

[0058] In one embodiment, the sliding channel 22 extends in a straight line direction. In one embodiment, the extending direction of the sliding channel 22 is perpendicular to the predetermined axis.

[0059] Further, please refer to Figures 1 to 21 , as a specific embodiment of the braking system provided by the present utility model, the first braking member 43 is a shrapnel. In this way, the shrapnel has a certain buffering effect when it is clamped in the notch 21 for braking.

[0060] Further, please refer to Figures 1 to 21 , as a specific embodiment of the braking system provided by the present utility model, the shrapnel is in an S shape. In this way, the deformation buffering ability when the shrapnel contacts the inner wall of the notch 21 is improved.

[0061] Further, please refer to Figures 1 to 21 , as a specific embodiment of the braking system provided by the present utility model, the predetermined axis is vertically arranged. In this way, when the rotating table 2 rotates around the predetermined axis, the horizontal orientation of the wheel 3 can be adjusted.

[0062] Further, please refer to Figures 1 to 21 , as a specific embodiment of the braking system provided by the present utility model, the sliding channel 22 is a chute provided on the support base 1, and the chute extends along a predetermined straight line. In this way, the sliding member 41 slides more smoothly along the chute extending along the predetermined straight line.

[0063] In one embodiment, the predetermined straight line is horizontally arranged.

[0064] Further, please refer to Figures 1 to 21, as a specific implementation of the braking system provided by the present utility model, further includes: a second braking member 61, a transmission mechanism 62, and a brake disc 63 disposed on the support base 1; the second braking member 61 is rotatably disposed on the rotating table 2 through a rotating shaft 64; the sliding member 41 can drive the second braking member 61 to rotate through the transmission mechanism 62; the second braking member 61 can be switched between a first rotation position and a second rotation position; when the sliding member 41 slides to the first position, the sliding member 41 drives the second braking member 61 to rotate to the first rotation position, and the wheel 3 is spaced from the second braking member 61, and the brake disc 63 and the second braking member 61 are spaced from each other; when the sliding member 41 slides to the second position, the sliding member 41 drives the second braking member 61 to rotate to the second rotation position, the wheel 3 contacts the second braking member 61, and the brake disc 63 and the second braking member 61 contact each other. Thus, the second braking member 61 is rotatably disposed on the rotating table 2 through the rotating shaft 64, and the sliding member 41 can drive the second braking member 61 to rotate through the transmission mechanism 62 during movement; the second braking member 61 can be switched between the first rotation position and the second rotation position; when the sliding member 41 is in the first position, the sliding member 41 pushes the second braking member 61 to rotate to the first rotation position; when the second braking member 61 rotates to the first rotation position, the second braking member 61 is spaced from the wheel 3, and the second braking member 61 is spaced from the brake disc 63, that is, the second braking member 61 does not brake the wheel 3 and the brake disc 63; when the sliding member 41 is in the second position, the sliding member 41 pushes the second braking member 61 to rotate to the second rotation position; when the second braking member 61 rotates to the second rotation position, the second braking member 61 contacts the wheel 3 and prevents the wheel 3 from rotating itself, and the second braking member 61 contacts the brake disc 63 and prevents the rotating table 2 from rotating, that is, the second braking member 61 can brake the wheel 3 and the rotating table 2 simultaneously.

[0065] In one embodiment, the rotating shaft 64 is horizontally disposed.

[0066] Further, please refer to Figures 1 to 21, as a specific implementation of the braking system provided by the present utility model, the transmission mechanism 62 includes: a cylinder body 621 provided on the support base 1 and having a sliding channel 6211, a rod body 622 inserted into the sliding channel 22 and slidable along the sliding channel 6211, and an elastic member 623 connecting the second braking member 61 and the rotating table 2; the second braking member 61 has a first end 611 and a second end 612 located on both sides of the rotating shaft 64 respectively; the rod body 622 is located between the sliding member 41 and the first end 611, and the elastic member 623 drives the first end 611 to abut against the rod body 622 so that the rod body 622 is clamped between the sliding member 41 and the first end 611; a convex portion 42 is provided on the sliding member 41; when the sliding member 41 slides to the first position, the sliding member 41 abuts against the rod body 622, and the second braking member 61 is located at the first rotating position; when the sliding member 41 moves to the second position, the convex portion 42 abuts against the rod body 622, and the convex portion 42 pushes the second braking member 61 from the first rotating position to the second rotating position through the rod body 622. Thus, the rod body 622 can slide along the sliding channel 6211; when the sliding member 41 is located at the first position, the rod body 622 is clamped between the sliding member 41 and the first end 611 of the second braking member 61, and the second braking member 61 is located at the first rotating position; when the sliding member 41 slides from the first position to the second position, the rod body 622 is clamped between the convex portion 42 and the first end 611 of the second braking member 61, and the convex portion 42 pushes the second braking member 61 from the first rotating position to the second rotating position through the rod body 622 to achieve braking; when the sliding member 41 returns from the second position to the first position, the second rotating member 52 returns to the first rotating position, and the rod body 622 is re-clamped between the sliding member 41 and the first end 611 of the second braking member 61.

[0067] In one embodiment, the second braking member 61 is a metal sheet.

[0068] In one embodiment, the rotating shaft 64 is connected to the rotating table 2 by a rivet 65.

[0069] In one embodiment, the elastic member 623 is a torsion spring.

[0070] In one embodiment, a first hole is formed on the support base 1, a second hole is formed on the brake disc 62, and the cylinder body 621 passes through the first hole and the second hole in sequence. In one embodiment, the cross-section of the cylinder body 621 is polygonal. The shapes of the first hole and the second hole are the same as the cross-section of the cylinder body 621. In one embodiment, the inner wall of the first hole has a first concave-convex structure, the inner wall of the second hole has a second concave-convex structure, the outer wall of the cylinder body 621 has a third concave-convex structure that engages with the first concave-convex structure, and the outer wall of the cylinder body 621 has a fourth concave-convex structure that engages with the second concave-convex structure.

[0071] In one embodiment, first annular limiting ribs 83 and second annular limiting ribs 84 are distributed at both end edges of the cylinder body 621. The support seat 1 is restricted between the first annular limiting rib 83 and the second annular limiting rib 84, and the brake disc 62 is restricted between the first annular limiting rib 83 and the second annular limiting rib 84.

[0072] In one embodiment, the rotating table 2 has a third hole, and the cylinder body 621 passes through the third hole. In one embodiment, in the extending direction of the cylinder body 621, the inner edge of the first hole, the inner edge of the third hole, and the inner edge of the second hole are sequentially arranged at intervals; a plurality of first balls 85 are arranged between the inner edge of the first hole and the inner edge of the third hole, and a plurality of second balls 86 are arranged between the inner edge of the third hole and the inner edge of the second hole.

[0073] In one embodiment, the convex platform portion 42 is fixed to the sliding member 41 by a first screw 87 (and a nut 882).

[0074] In one embodiment, the first braking member 43 is fixed to the sliding member 41 by a second screw 88.

[0075] Further, please refer to Figures 1 to 21 , as a specific implementation manner of the braking system provided by the present utility model, the first end 611 has a first braking portion 6111 adapted to the outer surface shape of the wheel 3; when the second braking member 61 rotates to the second rotation position, the first braking portion 6111 abuts against the outer surface of the wheel 3. Thus, the braking effect of the contact between the first braking portion 6111 and the wheel 3 is good.

[0076] Further, please refer to Figures 1 to 21 , as a specific implementation manner of the braking system provided by the present utility model, the surface of the brake disc 63 has a plurality of braking grooves 631, and the second end 612 has a second braking portion 6121; when the second braking member 61 rotates to the second rotation position, the second braking portion 6121 is clamped in the braking groove 631; when the second braking member 61 rotates to the first rotation position, the second braking portion 6121 is withdrawn from the braking groove 631. Thus, the braking effect can be improved after the second braking portion 6121 is clamped in the braking groove 631.

[0077] Please refer to Figures 1 to 21, the present utility model further provides a trolley, comprising: a load-bearing plate 7 and a braking system; the driving mechanism 5 includes: a rotating rod 51 rotatably arranged on the bottom surface of the load-bearing plate 7, a rotating member 52 arranged on the surface of the rotating rod 51, and a connecting rod 53; the support base 1 is arranged at the bottom of the load-bearing plate 7; one end of the connecting rod 53 is hinged (hinged: i.e., rotatably connected) to the rotating member 52, and the other end of the connecting rod 53 is hinged to the sliding member 41. Thus, when the user rotates the above-mentioned rotating rod 51, the rotating rod 51 can drive the rotating member 52 to rotate, and during the rotation of the rotating member 52, the sliding member 41 can be pulled to move through the connecting rod 53; due to the adoption of the above-mentioned braking system, the rotating platform 2 is arranged at the bottom of the support base 1, and the rotating platform 2 can rotate relative to the support base 1 around a predetermined axis; wheels 3 are arranged at the bottom of the rotating platform 2, and the support base 1 can move on the ground through the wheels 3; a sliding channel 22 is arranged on the support base 1, the sliding member 41 is slidably arranged in the sliding channel 22, and the sliding member 41 can slide between a first position and a second position; a first braking member 43 is arranged on the sliding member 41, and when the sliding member 41 slides, the first braking member 43 can be driven to move; there is a notch 21 on the rotating platform 2; when the sliding member 41 slides to the first position, the first braking member 43 can be clamped in the notch 21 and brake the rotating platform 2, and the first braking member 43 can prevent the rotating platform 2 from rotating relative to the support base 1, that is, the first braking member 43 can prevent the wheels 3 from rotating along with the rotating platform 2; when the sliding member 41 slides to the second position, the first braking member 43 moves to the outside of the notch 21, and the first braking member 43 cancels the braking of the rotating platform 2; that is, by switching the sliding member 41 between the first position and the second position, the steering braking of the rotating platform 2 (and the wheels 3 on the rotating platform 2) can be carried out, which is very convenient.

[0078] In one embodiment, a rotating piece 54 is connected to one end of the rotating rod 51. Thus, the user can pinch the rotating piece 54 and rotate the above-mentioned rotating rod 51.

[0079] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art of this technology, without departing from the technical principle of the present utility model, several improvements and replacements can still be made, and these improvements and replacements should also be regarded as the protection scope of the present utility model.

Claims

1. A braking system, characterized in that, include: A support seat, a rotating table rotatable around a predetermined axis at the bottom of the support seat, a notch arranged on the rotating table, a wheel rotatably arranged at the bottom of the rotating table, a sliding channel arranged on the support seat, a sliding member sliding in the sliding channel, a first brake member arranged on the sliding member, and a driving mechanism for driving the sliding member to slide; the sliding member can slide between a first position and a second position; when the sliding member is located at the first position, the first brake member can be clamped in the notch; when the sliding member is located at the second position, the first brake member is located outside the notch.

2. The braking system according to claim 1, characterized in that The first braking member is a spring sheet.

3. The braking system according to claim 2, wherein, The spring piece is S-shaped.

4. The braking system according to claim 1, wherein The predetermined axis is arranged vertically.

5. The braking system according to claim 1, characterized in that, The sliding channel is a sliding groove arranged on the support seat, and the sliding groove extends along a predetermined straight line.

6. The braking system according to any one of claims 1 to 5, characterized in that, Also includes: A second brake member, a transmission mechanism, and a brake disc disposed on the support seat; the second brake member is rotatably disposed on the rotating platform via a rotating shaft; The sliding member can drive the second braking member to rotate through the transmission mechanism; the second braking member can switch between a first rotation position and a second rotation position; When the sliding member slides to the first position, the sliding member drives the second brake member to rotate to the first rotation position, the wheel and the second brake member are spaced apart, and the brake disc and the second brake member are spaced apart; When the sliding member slides to the second position, the sliding member drives the second braking member to rotate to the second rotation position, the wheel contacts the second braking member, and the brake disc contacts the second braking member.

7. The braking system according to claim 6, characterized in that, The transmission mechanism comprises: a cylinder provided on the support seat and having a sliding channel, a rod body passing through the sliding channel and capable of sliding along the sliding channel, and an elastic member connecting the second brake member and the rotating platform; The second brake member has a first end and a second end respectively located on both sides of the rotating shaft; the rod body is located between the sliding member and the first end, and the elastic member drives the first end to abut against the rod body so that the rod body is clamped between the sliding member and the first end; A boss portion is provided on the sliding member; when the sliding member slides to the first position, the sliding member abuts against the rod body, and the second brake member is located at the first rotation position; when the sliding member moves to the second position, the boss portion abuts against the rod body, and the boss portion pushes the second brake member from the first rotation position to the second rotation position through the rod body.

8. The braking system according to claim 7, wherein The first end has a first braking portion adapted to the shape of the outer surface of the wheel; when the second braking member rotates to the second rotation position, the first braking portion abuts against the outer surface of the wheel.

9. The braking system according to claim 7, characterized in that, The surface of the brake disc has a plurality of brake grooves, and the second end has a second braking portion; when the second braking member rotates to the second rotation position, the second braking portion is clamped in the brake groove; when the second braking member rotates to the first rotation position, the second braking portion is withdrawn from the brake groove.

10. The trolley is characterized in that, Comprising: A load-bearing plate and the braking system according to any one of claims 1 to 9; The drive mechanism includes: a rotating rod rotatably disposed on the bottom surface of the load-bearing plate, a rotating member disposed on the surface of the rotating rod, and a connecting rod; the support seat is disposed at the bottom of the load-bearing plate; One end of the connecting rod is hinged to the rotating member, and the other end of the connecting rod is hinged to the sliding member.

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