CN216915972U

CN216915972U - Automatic braking structure of handcart

Info

Publication number: CN216915972U
Application number: CN202220164230.1U
Authority: CN
Inventors: 郭学义; 秦明志; 刘飞; 王小东; 袁涛; 向加
Original assignee: China Construction Eighth Engineering Division Technology Construction Co Ltd
Current assignee: China Construction Eighth Engineering Division Technology Construction Co Ltd
Priority date: 2022-01-21
Filing date: 2022-01-21
Publication date: 2022-07-08
Anticipated expiration: 2032-01-21

Abstract

The utility model relates to an automatic brake structure of a trolley, which comprises a reverse ratchet wheel set, wherein the reverse ratchet wheel set comprises an upper gear coaxially fixed with an accelerator of the trolley, a ratchet wheel fixed with an axle of the trolley, a pawl matched with the ratchet wheel and a rack meshed with the upper gear, the rack is connected with the pawl through a flexible rope, and an elastic piece used for meshing the pawl with the ratchet wheel is fixed on the pawl. The utility model realizes the braking function when the accelerator is not opened through the ratchet wheel structure in transmission connection with the accelerator of the trolley, thereby solving the technical problem that the electric trolley in the prior art needs to be parked and then is braked, and has great potential safety hazard in the use scenes of the upper slope and the lower slope. The reverse ratchet wheel set does not need to be braked after parking, can be flexibly regulated according to the state of an accelerator, and greatly improves the safety of using the handcart on the upper slope and the lower slope.

Description

Automatic braking structure of handcart

Technical Field

The utility model relates to the technical field of machinery, in particular to an automatic brake structure of a trolley.

Background

The electric trolley is a common mechanical device for building construction, is a tool for workers to convey materials such as cement mortar and the like on a construction site, but many workers have low protection awareness in the using process, and particularly when the electric trolley runs on an up-down slope surface in a loaded state, many workers forget to brake, so that vehicle landslide is caused to hurt the workers. Electric handcart among the prior art all need to park and then brake the operation, however this kind of mode has very big potential safety hazard in the use scene of upper and lower slope.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects existing in the prior art, the utility model provides an automatic braking structure of a trolley, which solves the technical problem that the electric trolley in the prior art needs to be parked and then is braked, and great potential safety hazards exist in the use scenes of an upper slope surface and a lower slope surface.

The utility model relates to an automatic brake structure of a trolley, which comprises a reverse ratchet group, wherein the reverse ratchet group comprises an upper gear coaxially fixed with an accelerator of the trolley, a ratchet fixed with an axle of the trolley, a pawl matched with the ratchet and a rack meshed with the upper gear, the rack is connected with the pawl through a flexible rope, and an elastic part for meshing the pawl with the ratchet is fixed on the pawl.

The automatic brake structure of the handcart is further improved in that the number of the reverse ratchet wheel sets is two, and the meshing directions of the two ratchet wheels and the pawl are opposite.

The automatic brake structure of the handcart is further improved in that the head of the pawl is matched with the ratchet wheel, the flexible rope is fixed in the middle of the pawl, one end of the elastic piece is fixed in the middle of the pawl and opposite to the position of the flexible rope, and the other end of the elastic piece is fixed on the handcart body.

The automatic brake structure of the handcart is further improved in that the elastic element is a spring, one end of the spring is fixed on the pawl, and the other end of the spring is fixed at the lower position of the pawl.

The automatic brake structure of the handcart is further improved in that the stiffness coefficient of the spring is 200N/m.

Compared with the prior art, the utility model has positive and obvious effect. According to the utility model, the brake function is realized when the accelerator is not opened through the ratchet wheel structure in transmission connection with the accelerator of the trolley, so that the technical problem that the electric trolley in the prior art needs to be parked and then is braked, and great potential safety hazards exist in the use scenes of an upper slope surface and a lower slope surface is solved. This reverse ratchet group need not to brake the operation again after the parking, but the regulation of can be nimble from carrying out the braking according to the state of throttle, has improved the security that uses the handcart on domatic about greatly, and the practicality is high, simple structure, simple to operate, and is with low costs.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic connection diagram of the automatic braking structure of the handcart.

Fig. 2 is a schematic overall structure diagram of the automatic braking structure of the trolley.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in figures 1 and 2, the utility model provides an automatic brake structure of a trolley, which comprises a reverse ratchet wheel 7 group, wherein the reverse ratchet wheel 7 group comprises an upper gear 1 coaxially fixed with a trolley accelerator, a ratchet wheel 7 fixed with an axle 2 of the trolley, a pawl 3 matched with the ratchet wheel 7 and a rack 4 meshed with the upper gear 1, the rack 4 is connected with the pawl 3 through a flexible rope 5, and an elastic piece for meshing the pawl 3 with the ratchet wheel 7 is fixed on the pawl 3. In the using process, when the handcart is driven to advance by screwing up the accelerator of the handcart, the accelerator of the handcart rotates clockwise to drive the upper gear 1 to rotate clockwise, the upper gear 1 drives the rack 4 to move upwards, so that the rack 4 pulls the pawl 3 to move upwards to further break away from the limiting effect on the ratchet wheel 7, and the ratchet wheel 7 is fixed with the axle 2, so that the wheels can normally advance; when the handcart loosens the accelerator, the upper gear is not stressed any more, the lower elastic part contracts to pull the upper flexible rope 5 to stretch, and then the pawl 3 is driven to move downwards to lock the ratchet wheel 7, so that the braking effect is achieved. The flexible rope 5 is made of flexible material, and the flexible material has certain elasticity, so that the pawl 3 can move downwards for a certain distance when the rack 4 is tightly clamped on the upper gear 1.

Preferably, the number of the reverse ratchet wheel 7 groups is two, the two ratchet wheel groups 7 are opposite to the meshing direction of the pawl 3, and the two ratchet wheel groups 7 and the pawl 3 jointly brake the axle 2 in opposite directions during operation, so that the brake failure of the single ratchet wheel 7 and the pawl 3 is avoided.

Specifically, the head of the pawl 3 is matched with the ratchet wheel 7, the flexible rope 5 is fixed in the middle of the pawl 3, one end of the elastic element is fixed in the middle of the pawl 3 and opposite to the position of the flexible rope 5, so that the pawl 3 is pulled to move up and down instead of rotating in the operation process, and the other end of the elastic element is fixed on the trolley body of the trolley.

Preferably, the elastic member is a spring 6, and one end of the spring 6 is fixed on the pawl 3, and the other end is fixed at a position below the pawl 3. When the accelerator of the handcart is screwed forward, the rack 4 applies upward tension to the pawl 3 so as to pull the pawl 3 to move upwards, at the moment, the spring 6 is in a stretching state, when the handcart is unscrewed, the rack 4 does not apply force to the pawl 3 any more, and the spring 6 is restored to a contracting state so as to drive the flexible material to generate the stretching state, so that the pawl 3 moves downwards and is clamped on the ratchet wheel.

Preferably, the spring 6 has a stiffness coefficient of 200N/m to satisfy a pulling force required to pull the pawl 3 downward.

In the present embodiment, the upper gear 1 is a gear having a module m of 4 and a number z of teeth of 18; the rack 4 has a module m equal to 4 and a tooth number z equal to 3; the ratchet teeth have a module m equal to 4 and a tooth number z equal to 18.

The utility model realizes the braking function when the accelerator is not opened through the ratchet wheel structure in transmission connection with the accelerator of the trolley, thereby solving the technical problem that the electric trolley in the prior art needs to be parked and then is braked, and has great potential safety hazard in the use scenes of the upper slope and the lower slope. This reverse ratchet group need not to brake the operation again after the parking, but the regulation of can be nimble from carrying out the braking according to the state of throttle, has improved the security that uses the handcart on domatic about greatly, and the practicality is high, simple structure, simple to operate, and is with low costs.

The parts not involved in the present invention are the same as or can be implemented by the prior art. Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims

1. The utility model provides a handcart self-actuating brake structure which characterized in that: the trolley accelerator comprises a reverse ratchet wheel set, wherein the reverse ratchet wheel set comprises an upper gear coaxially fixed with a trolley accelerator, a ratchet wheel fixed with a trolley axle, a pawl matched with the ratchet wheel and a rack meshed with the upper gear, the rack is connected with the pawl through a flexible rope, and an elastic piece used for enabling the pawl to be meshed with the ratchet wheel is fixed on the pawl.

2. An automatic brake structure for a handcart according to claim 1, wherein said reverse ratchet sets are two in number, and the engagement directions of said ratchet sets and said pawls are opposite.

3. An automatic brake structure for a cart according to claim 1, wherein said pawl has a head portion fitted to said ratchet wheel, said flexible cord is fixed to a central portion of said pawl, one end of said elastic member is fixed to said central portion of said pawl and located opposite to said flexible cord, and the other end of said elastic member is fixed to a body of said cart.

4. An automatic brake structure for a handcart according to claim 3, wherein said elastic member is a spring, one end of said spring is fixed to said pawl, and the other end of said spring is fixed to a position under said pawl.

5. A trolley auto-braking arrangement according to claim 4, characterized in that the spring has a stiffness coefficient of 200N/m.