CN211281162U

CN211281162U - Handcart capable of realizing safe pushing of slope

Info

Publication number: CN211281162U
Application number: CN201921331558.2U
Authority: CN
Inventors: 缪晓宾
Original assignee: Chongqing Industry Polytechnic College
Current assignee: Chongqing Industry Polytechnic College
Priority date: 2019-08-16
Filing date: 2019-08-16
Publication date: 2020-08-18
Anticipated expiration: 2029-08-16

Abstract

The utility model provides a handcart capable of realizing safe pushing of a slope, which comprises a front wheel and a brake mechanism, wherein a first pressure sensor is arranged on one side of a handrail, which faces a user, the upper surface of the handrail is provided with a second pressure sensor, a third pressure sensor is arranged on a front side baffle of a frame body, and the handcart is also provided with a horizontal sensor; the control circuit determines that the handcart descends along a slope when the horizontal sensor detects that the handcart inclines and the third pressure sensor detects that the pressure applied to the front side baffle plate by the articles in the frame is increased, judges whether the second pressure sensor detects the pressure or not, determines that a user holds the hand holding rod if the pressure is detected, controls the brake mechanism to brake step by step until the brake mechanism is completely braked, and determines that the user pushes the handcart when the first pressure sensor detects the pressure, and controls the brake force of the brake mechanism to descend by one step at the moment.

Description

Handcart capable of realizing safe pushing of slope

Technical Field

The utility model belongs to the handcart field, concretely relates to can realize handcart that slope safety promoted.

Background

As a common tool in daily life, a trolley generally includes a shopping cart in a supermarket, an airport luggage cart, and the like. In the prior art, trolleys are pushed based on manual control, in order to ensure the safety in the pushing process, some trolleys are also provided with a brake mechanism, for example, airport luggage trolleys are provided with a pressing connecting rod, and the brake mechanism is released to brake by manually pressing the pressing connecting rod. However, current carts are provided with a brake mechanism only to stop the cart. In the process of stopping the trolley, research and development personnel consider various scenes, for example, in the utility model patent with application number 201811238962.5, an automatic trolley braking method and system are disclosed, which can control the automatic trolley braking when a user loses hands to loosen the trolley, thereby avoiding the potential safety hazard of sliding on an inclined downhill when the trolley is in an unmanned binding state. In addition, in utility model application No. 201610714528.4, a novel handcart brake system is disclosed, wherein a pressure sensor is provided for determining whether a user holds a handcart, and the handcart is braked when the user does not hold the handcart. It follows that either of the two patents only addresses the safety issues during braking, only braking with the braking mechanism, and not the safety issues that may arise when pushing a trolley on an inclined downhill slope.

SUMMERY OF THE UTILITY MODEL

The utility model provides a can realize handcart that slope safety promoted to solve the safety problem that exists when the slope promotes the handcart to one side.

According to the first aspect of the embodiment of the present invention, there is provided a cart capable of safely pushing a slope, comprising a frame for carrying goods, wheels, a handrail, a first support frame for connecting the frame with the wheels, and a second support frame for connecting the frame with the handrail, wherein the wheels comprise a front wheel and a rear wheel, the front wheel is correspondingly provided with a brake mechanism, one side of the handrail facing a user is provided with a first pressure sensor, the upper surface of the handrail is provided with a second pressure sensor, a front side baffle of the frame is provided with a third pressure sensor, the cart is further provided with a level sensor, the first pressure sensor, the second pressure sensor, the third pressure sensor and the brake mechanism are respectively connected with a control circuit, the level sensor is used for detecting the inclination state of the cart, the first pressure sensor is used for detecting the pushing force of a user on the handcart, the second pressure sensor is used for detecting whether the user holds the handrail, and the third pressure sensor is used for detecting whether the pressure of the articles in the frame body, which is applied to the front side baffle plate, is increased;

the control circuit determines that the handcart descends along a slope when the horizontal sensor detects that the handcart inclines, and the third pressure sensor detects that the pressure applied to the front side baffle plate by the articles in the frame is increased, judges whether the second pressure sensor detects the pressure, determines that a user holds the grab bar, controls the brake mechanism to brake step by step if the pressure is detected, controls the brake mechanism to brake completely until the user pushes the handcart step by step when the first pressure sensor detects the pressure, and controls the brake force of the brake mechanism to descend by one step at the moment.

In an optional implementation manner, a fourth pressure sensor is arranged on one side, away from the user, of the handrail, the fourth pressure sensor is used for detecting the pulling force of the user on the handspike, the control circuit judges whether the fourth pressure sensor detects the pulling force in real time after controlling the braking force of the brake mechanism to drop by one step, if yes, it is determined that the user pulls the cart, and at the moment, the braking force of the brake mechanism is controlled to increase by one step;

if the fourth pressure sensor does not detect the pulling force, further judging whether the pressure detected by the first pressure sensor becomes zero within a first preset time, if so, judging whether the first pressure sensor detects the pressure again in real time, and controlling the braking force of the braking mechanism to decrease by one step when the first pressure sensor detects the pressure again; otherwise, timing is carried out from the first preset time after the first pressure sensor detects the pressure until the timing exceeds the second preset time, and at the moment, the braking force of the brake mechanism is controlled to descend by one step.

In another optional implementation manner, the front wheel is further provided with an angular velocity sensor connected with the control circuit, the control circuit is configured to determine whether the angular velocity detected by the angular velocity sensor exceeds a preset angular velocity, and if so, it is determined that the downward speed of the cart is too fast, and at this time, the brake mechanism is controlled to brake step by step until the angular velocity detected by the angular velocity sensor is smaller than the preset angular velocity.

In another alternative implementation, the control circuit controls the deactivation of the various stages of the braking mechanism when the level sensor detects that the cart is not tilted and the level sensor detects that the cart is tilted, but the third pressure sensor thereafter detects that the pressure exerted by the contents of the frame on the front side barrier is not increased.

In another optional implementation manner, the control circuit may include a controller, a first comparator, a first time delay, a first timer, a second timer, and a second comparator, wherein an output of the level sensor is connected to the first input terminal of the controller, output terminals of the third pressure sensors are respectively connected to the first input terminals of the first comparators and the second input terminals of the first comparators through the first time delay, an output terminal of the first comparator is connected to the second input terminal of the controller, an output terminal of the second pressure sensor is connected to the third input terminal of the controller, an output terminal of the first pressure sensor is connected to the fourth input terminal of the controller, a third output terminal of the controller is connected to the input terminal of the first timer, and an output terminal of the first timer is connected to the fifth input terminal of the controller, the output end of the fourth pressure sensor is connected with the sixth input end of the controller, the first output end of the controller is connected with the input end of the second timer, the output end of the second timer is connected with the eighth input end of the controller, the second output end of the controller is connected with the control end of the brake mechanism, the output end of the angular velocity sensor is connected with the first input end of the second comparator, the second input end of the second comparator is connected with the voltage for representing the preset angle, and the output end of the second comparator is connected with the ninth input end of the controller.

In another optional implementation manner, the level sensor sends the detected inclination angle to a first input end of the controller, the controller determines that the cart is inclined after receiving the inclination angle, and then judges whether a second input end of the controller receives a corresponding signal, wherein the first comparator compares pressures collected by the third pressure sensor twice before and after, if the pressures collected by the third pressure sensor twice before and after are gradually increased, the second input end of the controller receives the corresponding signal, and determines that the pressure applied by the object in the frame on the front side baffle plate is increased after the cart is inclined, so that the cart is determined to descend along the slope; then the controller firstly detects whether the third input end of the controller receives a pressure signal, if so, the controller determines that a user holds the grab bar by hand, and controls the brake mechanism to brake step by step through the second output end of the controller until the brake mechanism brakes completely; then judging whether the fourth input end of the handcart receives a pressure signal, if so, determining that a user pushes the handcart, and controlling the braking force of the brake mechanism to descend by one step through the second output end of the handcart;

after controlling the braking force of the brake mechanism to descend by one level, the controller judges whether a sixth input end of the controller receives a tension signal in real time, if so, the controller determines that a user pulls the trolley, and at the moment, the controller controls the braking force of the brake mechanism to be improved by one level through a second output end of the controller; if the sixth input end of the controller does not receive the tension signal, the third output end of the controller controls the first timer to start timing, after the timing reaches the first preset time, the first timer sends a first timing end signal to the fifth input end of the controller, the fifth input end of the controller judges whether the pressure signal received by the fourth input end of the controller is zero or not after receiving the first timing end signal, if the pressure signal is zero, the fourth input end of the controller judges whether the pressure signal is received again or not in real time, and when the pressure signal is received again by the fourth input end of the controller, the braking force of the brake mechanism is controlled to be reduced by one step again; if not, controlling the second timer to start timing through the first output end of the controller, sending a second timing end signal to the eighth input end of the controller by the second timer after the timing reaches the second preset time, and controlling the braking force of the braking mechanism to decrease by one step through the second output end of the controller; in addition, the second comparator compares the angular velocity detected by the angular velocity sensor with a preset angular velocity, if the angular velocity exceeds the preset angular velocity, a first signal is sent to a ninth input end of the controller, otherwise, a second signal is sent to the ninth input end of the controller, and after the ninth input end of the controller receives the first signal, the brake mechanism is controlled to brake step by step until the angular velocity detected by the angular velocity sensor is smaller than the preset angular velocity.

In another alternative implementation, the front wheels are all directional wheels, and the rear wheels are universal wheels.

The utility model has the advantages that:

1. the utility model controls the brake mechanism of the front wheel of the handcart to brake step by step in the process of transferring the handcart from the flat ground to the downhill slope until the handcart is completely braked, thereby realizing the non-pause stable transfer of the handcart from the plane to the downhill slope and having higher safety; the trolley is pushed and pulled by a user according to the actual situation on a slope, and the trolley is automatically controlled to brake to a corresponding degree according to the pushing and pulling operation, so that the trolley can descend at an allowable arbitrary speed, and the user cannot topple forwards due to overlarge descending speed of the trolley in the descending process of the trolley, so that the time for the user to push the trolley to pass through the slope can be shortened, and the safety for the user to push the trolley to pass through the slope is ensured;

2. the utility model considers two possible pushing modes in the process of pushing the handcart by the user, directly controls the descending stage number of the braking force of the braking mechanism according to the pushing times in the mode of controlling the descending speed of the handcart by pushing the handcart according to times, and controls the descending stage number of the braking force of the braking mechanism by setting a second preset time in the mode of continuously pushing the handcart, so that the requirement of the user for rapidly increasing the descending speed of the handcart can be met, and the user can push the handcart without wasting effort after the descending speed is increased;

3. the utility model discloses a set up angular velocity sensor, when the angular velocity that this angular velocity sensor detected exceeded preset angular velocity, control brake mechanism brakies step by step, until the angular velocity that this angular velocity sensor detected is less than this preset angular velocity, can further guarantee the security that the user promoted the handcart in the slope from this;

4. the utility model discloses can also guarantee the handcart normal promotion on level ground and slope to one side.

Drawings

Fig. 1 is a schematic structural view of an embodiment of the trolley capable of safely pushing a slope according to the present invention;

FIG. 2 is a left side view of FIG. 1;

fig. 3 is a circuit block diagram of an embodiment of the present invention for a cart that can be safely pushed along a slope;

FIG. 4 is a schematic structural view of an embodiment of the braking mechanism of the present invention;

FIG. 5 is a side view of the orienting wheel of FIG. 4;

FIG. 6 is a top view of the brake mechanism of FIG. 4.

Detailed Description

In order to make those skilled in the art understand the technical solutions in the embodiments of the present invention better and make the above objects, features and advantages of the embodiments of the present invention more obvious and understandable, the following description of the technical solutions in the embodiments of the present invention will be made in detail with reference to the accompanying drawings.

In the description of the present invention, unless otherwise specified and limited, it is to be noted that the term "connected" is to be interpreted broadly, for example, it may be mechanically or electrically connected, or it may be connected between two elements, directly or indirectly through an intermediate medium, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.

At present, when a user pushes a trolley to go up and down on a slope, the user usually stops and stabilizes the trolley after arriving at the slope, and for the slope without an inclined elevator, when the user pushes the trolley to go down along the slope, the user is usually careful, the user needs to move footsteps while dragging the trolley, so that the safety of the user going down is hardly ensured, and when the user pushes the trolley to go up and down on the slope, the moving speed of the user is greatly limited. Therefore, the utility model provides a can realize handcart that slope safety promoted, the user can carry out the push-and-pull operation to the handcart according to self actual conditions on the downhill path to one side, carry out the braking that corresponds the degree according to this push-and-pull operation automatic control handcart, thereby make the handcart can be down with the arbitrary speed of allowwing, because the down speed of handcart is that the user is according to its self actual conditions, carry out the push-and-pull operation through the handcart and come the affirmation, consequently can not make the user topple over forward because of the down speed of handcart is too big at the down in-process of handcart, thereby can guarantee user's safety.

Referring to fig. 1, it is a structural schematic diagram of an embodiment of the cart for safely pushing a slope according to the present invention. Referring to fig. 2, the trolley capable of safely pushing a slope may include a frame 1 for carrying goods, wheels 2, a handrail 3, a first support frame 5 for connecting the frame 1 with the wheels 2, and a second support frame 4 for connecting the frame 1 with the handrail 3, wherein the wheels 2 include a front wheel 21 and a rear wheel 22, the front wheel 21 is correspondingly provided with a brake mechanism (not shown in fig. 1), a first pressure sensor 31 is arranged on the side of the handrail 3 facing a user, a second pressure sensor 32 is arranged on the upper surface of the handrail 3, a third pressure sensor 11 is arranged on a front baffle of the frame 1, a level sensor 6 is further arranged on the trolley, and the level sensor 6, the first pressure sensor 31, the second pressure sensor 32, the third pressure sensor 11 and the brake mechanism are respectively connected with a control circuit (not shown in fig. 1), the level sensor 6 is used for detecting the inclination of the trolley, the first pressure sensor 31 is used for detecting the pushing force of a user to the trolley, the second pressure sensor 32 is used for detecting whether the user holds the handrail 3, and the third pressure sensor 11 is used for detecting whether the pressure of the articles in the frame body 1 exerted on the front side baffle plate is increased.

Since the trolley is inclined when travelling on a slope, whether uphill or downhill, it is clearly not accurate to determine whether the trolley is descending merely from whether the level sensor detects that the trolley is inclined. And the handcart is at the in-process that descends, and article in its frame can move to the front side baffle side of handcart frame usually to the pressure that makes to apply on the front side baffle increases, from this the utility model discloses in set up third pressure sensor on the front side baffle of frame, the pressure that article were applied on the handcart front side baffle in the frame 1 can increase when the handcart is down. Control circuit is in horizontal sensor 6 detects the handcart and appears inclining, and afterwards third pressure sensor 11 detects article are applyed in the framework 1 when the pressure on the front side baffle increases, confirm that this handcart is down along the slope.

At present, a user usually stops when pushing a handcart to descend along a slope, the handcart is pushed to move to an inclined downhill with small attention, the user stops when pushing the handcart to move from a flat ground to the inclined downhill, the process cannot be performed continuously, and before the handcart is pushed to the inclined downhill from the flat ground, if the pushing speed of the handcart on the flat ground is high, the speed of the handcart is increased sharply after the handcart moves to the inclined downhill due to untimely braking, the upper half of the user moves forwards under the driving of the handcart, and the lower half of the user cannot catch up with the downslide foot of the handcart, so that the whole body of the user inclines forwards, and the user is likely to tip forwards seriously. Therefore, when a user pushes the traditional trolley from a flat ground to a slope, the pushing process is not consistent and the safety is low. Therefore, the utility model discloses control circuit is according to the signal that this level sensor and third pressure sensor detected, when confirming this handcart down along the slope, judges whether second pressure sensor detects pressure, if detect pressure, then indicates that the user holds the handrail, and control brake mechanism brakies step by step this moment. In the process of transferring the cart from flat ground to a downhill slope, if the brake mechanism is directly and completely braked, the speed of the cart will drop sharply, and the upper body of the user may stop under the drive of the cart, while the lower body of the user still travels at the previous speed, which may cause the user to lean backward in the whole body, and may seriously cause the user to topple backward. The utility model gradually brakes the brake mechanism behind the handcart in the process of transferring the handcart from the flat ground to the slope, until the brake mechanism is completely braked, in the process, the condition that the speed of the handcart is suddenly increased or suddenly reduced due to emergency braking can be avoided, the speed of the handcart of the utility model is gradually changed, in the process, the user can gradually adapt to the change, so that the utility model can be seen in the process of transferring the handcart from the flat ground to the inclined downhill, no matter how fast the user pushes the cart on flat ground, the user may not have to stop the vehicle, and the user can be prevented from falling down due to the asynchrony of the upper and lower bodies in the process of transferring the handcart from the flat ground to the slope, namely, the utility model discloses can realize that the handcart is higher from the plane to the no pause steady transfer and the security of the downhill path.

When a user completely transfers the handcart to an inclined downhill, the handcart tends to descend under the action of the gravity of the handcart and the gravity of objects in the frame body, and at the moment, the user pushes and pulls the hand-held rod, so that the handcart can be freely controlled to move at the speed required by the user. After the trolley is completely transferred to an inclined downhill and the brake mechanism is completely braked, a user can control the trolley to move downwards by pushing the handrail, at the moment, the first pressure sensor arranged on the handrail and facing to one side of the user detects pressure, and the control circuit determines that the user pushes the trolley when the first pressure sensor detects the pressure, and at the moment, controls the brake force of the brake mechanism to be reduced by one step (for example, the brake force is 100% when the brake mechanism is completely braked, and the brake force is 80% after the brake force is reduced by one step, and the like).

Because the handcart is descending the in-process, its speed can grow gradually, after this brake mechanism's braking dynamics descends one-level, if the user thinks the descending speed of the in-process handcart of descending too big, oneself can't catch up its descending rhythm soon, can through pull the handcart backward and slow down. Correspondingly, detect for the action to user pulling handcart, the utility model discloses one side that deviates from the user on the handrail is provided with fourth pressure sensor, fourth pressure sensor is used for detecting the pulling force of user to the handcart, control circuit is behind the one-level that descends of this brake mechanism's braking dynamics, judges whether fourth pressure sensor detects the pulling force, if, then confirms that the user is at this handcart of pulling, and this brake mechanism's braking dynamics of control this moment improves the one-level.

In addition, after the braking force of the brake mechanism is reduced by one step, if the user feels that the descending speed of the trolley is too low in the descending process, the user can further push the hand holding rod to control the braking force of the brake mechanism to be reduced by one step. When a user pushes the grab bar, two operation modes are available, one mode is to loosen the hand after pushing the trolley once, and push the trolley once again when the descending speed needs to be increased; the other is that the user pushes the cart continuously, providing a continuous pushing force to the cart during the descent. Since the speed of the cart is gradually increased during the downward movement, the downward movement speed of the cart is further increased if the user provides a continuous pushing force to the cart. When a user pushes the grab bar in one mode, the braking force degree reduction stage number of the brake mechanism can be determined directly according to the pushing times of the user pushing the handcart, but if the user pushes the grab bar in the second mode, the braking force degree reduction stage number is still determined according to the pushing times, which is obviously unrealistic. Therefore, the utility model discloses control circuit is when judging whether fourth pressure sensor detects the pulling force, if this fourth pressure sensor does not detect the pulling force, then further judge whether the pressure that this first pressure sensor detected becomes zero in first preset time, if, then judge whether this first pressure sensor detects pressure again in real time, when this first pressure sensor detects pressure again, control this brake mechanism's braking dynamics and descend one-level again; otherwise, timing is carried out from the first preset time after the first pressure sensor detects the pressure until the timing exceeds the second preset time, and at the moment, the braking force of the brake mechanism is controlled to descend by one step. The utility model discloses having considered two kinds of promotion modes that the user promoted handcart in-process probably to exist, to promoting the handcart to control the mode of handcart down speed according to the number of times, directly control the descending progression of brake mechanism braking dynamics according to promoting the number of times, to the mode that lasts the promotion handcart, through setting up the descending progression that the second preset time controlled the brake mechanism braking dynamics, so can satisfy the demand that the user promoted handcart down speed fast, the back user just can needn't hard promote the handcart again after the speed of going.

Certainly, in order to further guarantee the security that the user promoted the handcart in the slope downhill path, still be provided with on the front wheel with the angular velocity sensor that control circuit connects, control circuit is used for judging whether the angular velocity that this angular velocity sensor detected surpasses and predetermines angular velocity, if, then confirms that this handcart is down fast too, controls this moment brake mechanism brakies step by step, and the angular velocity that detects until this angular velocity sensor is less than this and predetermines angular velocity. The level sensor detects that the cart is no longer tilted when the user pushes the cart to travel to the end of an incline, and the level sensor detects that the cart is tilted when the user pushes the cart to travel up the incline, and the third pressure sensor detects that the pressure exerted on the front side barrier by the items in the frame is not increased after detecting that the cart is tilted. In order to ensure normal pushing of the trolley on a level ground and an inclined ascending slope, the control circuit controls to cancel braking of each stage of the braking mechanism when the level sensor detects that the trolley is not inclined and the level sensor detects that the trolley is inclined, but the third pressure sensor detects that the pressure applied to the front side baffle by the articles in the frame is not increased.

In this embodiment, since the conventional cart (e.g., shopping cart, etc.) has a frame, wheels, a handrail, a first support frame for connecting the frame and the wheels, and a second support frame for connecting the frame and the handrail, these structures will not be described in a limited way. After a user places an article in the frame body, the user holds and pushes the handrail, so that the wheels can rotate, and the whole trolley is driven to be pushed forwards. The utility model discloses in this front wheel and rear wheel all can be including controlling two, and this rear wheel can be the universal wheel, and this front wheel and front wheel can be directional wheel, the utility model discloses a make the rear wheel be the universal wheel, the front wheel is directional wheel, and the user can promote the handcart to rotate towards arbitrary direction to it is more laborsaving rotating the in-process. Because when the user promoted the handrail, the user palm can exert pressure to handrail towards one side of user, consequently the utility model discloses set up first pressure sensor to one side of user on handrail, whether detect pressure according to first pressure sensor and detect whether the user is promoting this handcart, indicate the user when detecting pressure and promote the handcart. Because when the user held the handrail, its palm was taken the upside of handrail usually, consequently the utility model discloses set up second pressure sensor at the upside of handrail, whether detect pressure according to second pressure sensor and detect whether the user held the handrail, expressed the user when detecting pressure and held the handrail. Because when the handcart moves to the downhill path that inclines, article in its framework can move forward to exert pressure to the front side baffle of framework, therefore the utility model discloses set up third pressure sensor on the front side baffle of framework, after this handcart appears inclining, if the pressure increase that this third pressure sensor detected, then show this handcart and move to the downhill path that inclines. The level sensor is a device capable of detecting the levelness of the trolley in the prior art, and the detection of the levelness belongs to the prior art, and is not described herein again. For the position of the level sensor, the level sensor may be arranged at or near the center of gravity of the cart, wherein when the level sensor detects a tilting angle, it indicates that the cart is tilted, and when the tilting angle is not detected, it indicates that the cart is not tilted.

According to the embodiment, the trolley is transferred from the flat ground to the downhill slope, the braking mechanism of the front wheel of the trolley is controlled to brake step by step until the trolley is completely braked, the trolley can be stably transferred from the plane to the downhill slope without pause, and the safety is high; the trolley is pushed and pulled by a user according to the actual situation on a slope, and the trolley is automatically controlled to brake to a corresponding degree according to the pushing and pulling operation, so that the trolley can move downwards at an allowable arbitrary speed, the user cannot topple forwards due to the fact that the downward speed of the trolley is too high in the downward process of the trolley, the time for pushing the trolley by the user to pass through the slope can be shortened, and the safety for pushing the trolley by the user to pass through the slope is ensured.

Referring to fig. 3, the control circuit of the present invention may include a controller, a first comparator, a first time delay, a first timer, a second time delay and a second comparator, wherein the output terminal of the level sensor is connected to the first input terminal of the controller, the output terminals of the third pressure sensors are respectively connected to the first input terminal of the first comparator and the second input terminal of the first comparator through the first time delay, the output terminal of the first comparator is connected to the second input terminal of the controller, the output terminal of the second pressure sensor is connected to the third input terminal of the controller, the output terminal of the first pressure sensor is connected to the fourth input terminal of the controller, the third output terminal of the controller is connected to the input terminal of the first time delay, the output terminal of the first time delay is connected to the fifth input terminal of the controller, the output end of the fourth pressure sensor is connected with the sixth input end of the controller, the first output end of the controller is connected with the input end of the second timer, the output end of the second timer is connected with the eighth input end of the controller, the second output end of the controller is connected with the control end of the brake mechanism, the output end of the angular velocity sensor is connected with the first input end of the second comparator, the second input end of the second comparator is connected with the voltage for representing the preset angle, and the output end of the second comparator is connected with the ninth input end of the controller.

In this embodiment, the horizontal sensor sends the detected inclination angle to the first input end of the controller, and the controller determines that the cart is inclined after receiving the inclination angle, and then determines whether the second input end of the controller receives a corresponding signal, wherein the first comparator compares pressures collected by the third pressure sensor twice before and after, if the pressures collected by the third pressure sensor twice before and after are gradually increased, the second input end of the controller receives the corresponding signal, and determines that the pressure applied by the object in the frame to the front side baffle plate is increased after the cart is inclined, so as to determine that the cart descends along the slope; then the controller firstly detects whether the third input end of the controller receives a pressure signal, if so, the controller determines that a user holds the grab bar by hand, and controls the brake mechanism to brake step by step through the second output end of the controller until the brake mechanism brakes completely; and then judging whether the fourth input end of the handcart receives a pressure signal or not, if so, determining that the handcart is pushed by a user, and controlling the braking force of the brake mechanism to descend by one step through the second output end of the handcart.

After controlling the braking force of the brake mechanism to descend by one level, the controller judges whether a sixth input end of the controller receives a tension signal in real time, if so, the controller determines that a user pulls the trolley, and at the moment, the controller controls the braking force of the brake mechanism to be improved by one level through a second output end of the controller; if the sixth input end of the controller does not receive the tension signal, the third output end of the controller controls the first timer to start timing, after the timing reaches the first preset time, the first timer sends a first timing end signal to the fifth input end of the controller, the fifth input end of the controller judges whether the pressure signal received by the fourth input end of the controller is zero or not after receiving the first timing end signal, if the pressure signal is zero, the fourth input end of the controller judges whether the pressure signal is received again or not in real time, and when the pressure signal is received again by the fourth input end of the controller, the braking force of the brake mechanism is controlled to be reduced by one step again; if not, the first output end of the controller controls the second timer to start timing, after the timing reaches the second preset time, the second timer sends a second timing end signal to the eighth input end of the controller, and the controller controls the braking force of the braking mechanism to decrease by one step through the second output end of the controller. In addition, the second comparator compares the angular velocity detected by the angular velocity sensor with a preset angular velocity, if the angular velocity exceeds the preset angular velocity, a first signal is sent to a ninth input end of the controller, otherwise, a second signal is sent to the ninth input end of the controller, and after the ninth input end of the controller receives the first signal, the brake mechanism is controlled to brake step by step until the angular velocity detected by the angular velocity sensor is smaller than the preset angular velocity.

In addition, traditional brake mechanism has wired caliper formula brake equipment and caliper formula brake equipment, but these brake equipment either need manual operation, or the structure is more complicated, for example to caliper formula brake equipment, need set up hydraulic oil, brake pump, brake block etc. this has increased the whole weight of handcart certainly, can influence the normal use of handcart. Therefore, the utility model discloses to non-motorized handcart, designed a neotype brake mechanism, this brake mechanism simple structure and light, when realizing that the braking dynamics increases step by step, descends step by step, can not make the whole weight of handcart improve by a wide margin, guarantee the normal use of handcart. The brake mechanism is shown in fig. 4, and is located between a left directional wheel set 100 and a right directional wheel set 200 which are arranged side by side, each of the left directional wheel set 100 and the right directional wheel set 200 comprises a plurality of directional wheels which roll independently and are arranged side by side, and for each directional wheel, as shown in fig. 5, each directional wheel comprises a tire 101 and a hub 102 for supporting an inner profile of the tire 101, and spokes 103 are arranged inside the hub; as shown in fig. 6, the brake mechanism includes a motor 301, a gear 302, a first brake lever 306, a second brake lever 307, a first connecting rod 304, a second connecting rod 305, and a base 308, wherein the motor 301 is fixed on a lower surface of the base 308 and is fixedly connected to the gear 302.

The motor 301 drives the gear 302 to rotate; the first connecting rod 304 and the second connecting rod 305 are both composed of a vertical section and a lateral section connected to each other, the top ends of the vertical sections of the first connecting rod 304 and the second connecting rod 305 are fixed on the lower surface of the base 308, a side of the lateral section of the first connecting rod 304 facing the gear 302 is provided with a first sliding track, the side of the transverse section of the second connecting rod 305 facing the gear 302 is provided with a second sliding track, the first brake lever 306 is inserted into the first sliding track from one end of the transverse section of the first connecting rod 304, the second brake lever 307 is inserted into the second sliding track from one end of the lateral section of the second connecting rod 305, the side of the first brake lever 306 facing the gear wheel 302 is provided with a toothed structure engaging with the gear wheel 302, the side of the second brake lever 307 facing the gear 302 is provided with a toothed structure which is meshed with the gear 302; the motor 301 drives the gear 302 to rotate, so as to drive the first brake lever 306 to move laterally along the first sliding track, and drive the second brake lever 307 to move laterally along the second sliding track; when the braking force of the brake mechanism is controlled to be increased by one step, so as to perform stepwise braking, each time the motor 301 rotates by a corresponding angle, the gear 302 drives the first brake lever 306 and the second brake lever 307 to move to the left and right by a corresponding distance, respectively, so that the first brake lever 306 is inserted between spokes of the left directional wheel of the leftmost braked directional wheel in the left directional wheel set 100, and the second brake lever 307 is inserted between spokes of the right directional wheel of the rightmost braked directional wheel in the right directional wheel set 200, thereby maintaining the braking of the same plurality of directional wheels in the left directional wheel set 100 and the right directional wheel set 200.

When the braking force of the brake mechanism is controlled to decrease by one step, the gear 302 drives the first brake lever 306 and the second brake lever 307 to move to the right and left by a corresponding distance for each rotation of the motor 301, so that the first brake lever 306 is pulled away from the spokes of the leftmost braked directional wheel in the left directional wheel set 100, and the second brake lever 307 is pulled away from the spokes of the rightmost braked directional wheel in the right directional wheel set 200, thereby maintaining the braking of the same directional wheels in the left directional wheel set 100 and the right directional wheel set 200.

When the corresponding brake rod is inserted into the spokes of the corresponding orientation wheel, the corresponding orientation wheel may be in a rolling state, and at the moment, the corresponding brake rod may collide with the spokes on the corresponding orientation wheel in the insertion process, so that the corresponding brake rod cannot be accurately inserted into the spokes of the corresponding orientation wheel at one time. Therefore, the utility model discloses to every directional wheel in directional wheelset in a left side or the directional wheelset in the right side, all be provided with the angle sensor who is connected with control circuit on this directional wheel, each angle sensor is used for detecting the rotation angle that corresponds directional wheel and transmits this rotation angle for this control circuit, control circuit still is connected with this motor. When the braking force of the brake mechanism is controlled to be improved by one step, and the ith directional wheel close to the motor in the left directional wheel set and the right directional wheel set is respectively braked, the control circuit judges whether the first brake rod and the second brake rod are correspondingly aligned with the spokes of the ith directional wheel in the left directional wheel set and the spokes of the ith directional wheel in the right directional wheel set according to angle information detected by an angle sensor arranged on the ith directional wheel in the left directional wheel set or the right directional wheel set, if so, the control circuit controls the motor to rotate by a corresponding angle so as to drive the gear to rotate, the gear correspondingly drives the first brake rod and the second brake rod to respectively move towards the left and the right by corresponding distances while rotating, so that the first brake rod is inserted between the spokes of the ith directional wheel in the left directional wheel set, and the second brake rod is inserted between the spokes of the ith directional wheel in the right directional wheel set, therefore, the number of the braking directional wheels in the left directional wheel set and the number of the braking directional wheels in the right directional wheel set are increased to i, so that the i directional wheels close to the motor in the left directional wheel set and the right directional wheel set respectively realize braking, and i is an integer larger than 0. In addition, when the braking force of the brake mechanism is controlled to be reduced by one step, and the i-th directional wheel close to the motor in the left directional wheel set and the right directional wheel set respectively cancels braking, the control circuit controls the motor to rotate by a corresponding angle, so as to drive the gear to rotate, and the gear correspondingly drives the first brake rod and the second brake rod to move towards the right and the left by a corresponding distance while rotating, so that the first brake rod is drawn away from spokes of the i-th directional wheel in the left directional wheel set, and the second brake rod is drawn away from spokes of the i-th directional wheel in the right directional wheel set, so as to reduce the number of the braking directional wheels in the left directional wheel set and the right directional wheel set to i-1, and keep braking on the i-1 directional wheels close to the motor in the left directional wheel set and the right directional wheel set.

Although the utility model discloses a set up angle sensor, can confirm whether correspond the brake lever with correspond to go up the spoke between to aim at, but aim at the back directional wheel and still be in the roll state, if the rotational speed of motor this moment is too slow, then correspondingly the moving speed of brake lever will be slower, when directional wheel roll speed is faster, probably when the brake lever moves to directional wheel department, the brake lever no longer with the spoke of directional wheel between aim at, but with the spoke alignment of directional wheel. In order to further guarantee to insert the brake lever accurately between the spoke that corresponds the directional wheel, the utility model discloses to every directional wheel in the directional wheelset of left side or the directional wheelset of right side, all be provided with the angular velocity sensor who is connected with this control circuit on this directional wheel, each angular velocity sensor all is used for detecting the angular velocity that corresponds the directional wheel and gives this control circuit with this angular velocity transmission. When the control circuit brakes the ith directional wheel close to the motor in the left directional wheel set and the right directional wheel set, the rotation speed of the motor is adjusted according to the angular speed detected by the angular speed sensor on the ith directional wheel in the left directional wheel set or the right directional wheel set, so that the first brake rod is inserted between the spokes after being aligned with the ith directional wheel in the left directional wheel set, and the second brake rod is inserted between the spokes after being aligned with the ith directional wheel in the right directional wheel set.

In this embodiment, the motor, the gear, the first connecting rod and the second connecting rod are located between the left directional wheel set and the right directional wheel set. The left directional wheel set and the right directional wheel set are fixed on the lower surface of the base and are arranged in a bilateral symmetry mode. The length of first brake lever is greater than or equal to the length of the horizontal section of this first connecting rod, and the length of second brake lever is greater than or equal to the length of the horizontal section of this first connecting rod. The utility model discloses well rotation axis of every directional wheel is located same water flat line.

It is seen from the above embodiment that, the utility model discloses brake mechanism simple structure and light when realizing that the braking dynamics increases step by step, descends step by step, can not make the whole weight of handcart improve by a wide margin, guarantees the normal use of handcart. The utility model discloses be particularly useful for non-motorized handcart. The utility model discloses this left directional wheelset is the left side front wheel of this handcart among the brake mechanism, and this right directional wheelset is the right side front wheel of this handcart.

It should be noted that: in general, the skilled person will not be aware of the insertion of a brake bar between the spokes of a wheel to brake the vehicle, because conventional vehicles travel at a very high speed, brake bars are difficult to align with and insert in time into the area between the spokes of the wheel, and brake bars require a high force to be pulled out from between the spokes, but the present invention differs in that the hand truck is held by a human hand throughout the pushing process, the hand truck travels at a slow speed with the speed of the human walking, and correspondingly the speed of the wheel traveling is slow, so that the brake bars are easier to align with and insert in time into the area between the spokes of the wheel, and the person pulls the hand truck backwards when the brake bars are pulled out from between the spokes, thus the brake bars can be pulled out from between the spokes without a high force, visibly, the utility model provides a brake mechanism is particularly useful for the utility model discloses the handcart downhill path promotes the safety braking scene.

Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.

It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is to be controlled solely by the appended claims.

Claims

1. A trolley capable of being safely pushed on a slope comprises a frame body for bearing goods, wheels, a handrail, a first support frame for connecting the frame body with the wheels and a second support frame for connecting the frame body with the handrail, wherein the wheels comprise front wheels and rear wheels, the trolley is characterized in that the front wheels are correspondingly provided with brake mechanisms, one side, facing a user, of the handrail is provided with a first pressure sensor, the upper surface of the handrail is provided with a second pressure sensor, a front side baffle of the frame body is provided with a third pressure sensor, the trolley is further provided with a horizontal sensor, the first pressure sensor, the second pressure sensor, the third pressure sensor and the brake mechanisms are respectively connected with a control circuit, the horizontal sensor is used for detecting the inclined state of the trolley, and the first pressure sensor is used for detecting the thrust of the user on the trolley, the second pressure sensor is used for detecting whether a user holds the grab bar, and the third pressure sensor is used for detecting whether the pressure applied to the front side baffle by the articles in the frame body is increased;

2. The trolley capable of safely pushing on a slope according to claim 1, wherein a fourth pressure sensor is disposed on a side of the handrail away from the user, the fourth pressure sensor is used for detecting a pulling force of the user on the handspike, the control circuit determines whether the fourth pressure sensor detects the pulling force in real time after controlling the braking force of the brake mechanism to decrease by one step, if yes, it is determined that the user pulls the trolley, and at the moment, the braking force of the brake mechanism is controlled to increase by one step;

3. The trolley capable of safely pushing on a slope according to claim 1 or 2, wherein the front wheel is further provided with an angular velocity sensor connected to the control circuit, the control circuit is configured to determine whether the angular velocity detected by the angular velocity sensor exceeds a preset angular velocity, and if so, it is determined that the trolley is moving downwards at a too high speed, and at this time, the braking mechanism is controlled to brake gradually until the angular velocity detected by the angular velocity sensor is less than the preset angular velocity.

4. A trolley for slope safety as claimed in claim 1, wherein the control circuit is adapted to control the release of the brakes when the level sensor detects that the trolley is not tilted and the level sensor detects that the trolley is tilted, but the third pressure sensor thereafter detects that the pressure exerted by the contents of the frame on the front wall is not increased.

5. The cart capable of safely pushing on a slope according to claim 2, wherein the control circuit comprises a controller, a first comparator, a first time delay, a first timer, a second timer and a second comparator, wherein the output terminal of the level sensor is connected to the first input terminal of the controller, the output terminals of the third pressure sensors are respectively connected to the first input terminal of the first comparator and the second input terminal of the first comparator through the first time delay, the output terminal of the first comparator is connected to the second input terminal of the controller, the output terminal of the second pressure sensor is connected to the third input terminal of the controller, the output terminal of the first pressure sensor is connected to the fourth input terminal of the controller, the third output terminal of the controller is connected to the input terminal of the first timer, the output terminal of the first timer is connected to the fifth input terminal of the controller, the output end of the fourth pressure sensor is connected with the sixth input end of the controller, the first output end of the controller is connected with the input end of the second timer, the output end of the second timer is connected with the eighth input end of the controller, the second output end of the controller is connected with the control end of the brake mechanism, the output end of the angular velocity sensor is connected with the first input end of the second comparator, the second input end of the second comparator is connected with the voltage for representing the preset angle, and the output end of the second comparator is connected with the ninth input end of the controller.

6. A slope safety pushing enabled trolley according to claim 5, wherein said angular velocity sensors are all adapted to detect the angular velocity of the corresponding orientation wheel; the horizontal sensor sends the detected inclination angle to a first input end of the controller, the controller determines that the trolley inclines after receiving the inclination angle, and then judges whether a second input end of the trolley receives a corresponding signal or not, wherein the first comparator compares pressures acquired by the third pressure sensor twice in the front and back; then the controller firstly detects whether the third input end of the controller receives a pressure signal, if so, the controller determines that a user holds the grab bar by hand, and controls the brake mechanism to brake step by step through the second output end of the controller until the brake mechanism brakes completely; then judging whether the fourth input end of the handcart receives a pressure signal, if so, determining that a user pushes the handcart, and controlling the braking force of the brake mechanism to descend by one step through the second output end of the handcart;

after controlling the braking force of the brake mechanism to descend by one level, the controller judges whether a sixth input end of the controller receives a tension signal in real time, if so, the controller determines that a user pulls the trolley, and at the moment, the controller controls the braking force of the brake mechanism to be improved by one level through a second output end of the controller; if the sixth input end of the controller does not receive the tension signal, the third output end of the controller controls the first timer to start timing, after the timing reaches the first preset time, the first timer sends a first timing end signal to the fifth input end of the controller, the fifth input end of the controller judges whether the pressure signal received by the fourth input end of the controller is zero or not after receiving the first timing end signal, if the pressure signal is zero, the fourth input end of the controller judges whether the pressure signal is received again or not in real time, and when the pressure signal is received again by the fourth input end of the controller, the braking force of the brake mechanism is controlled to be reduced by one step again; if not, controlling the second timer to start timing through the first output end of the controller, sending a second timing end signal to the eighth input end of the controller by the second timer after the timing reaches the second preset time, and controlling the braking force of the braking mechanism to decrease by one step through the second output end of the controller; in addition, the angular velocity detected by the angular velocity sensor is compared with a preset angular velocity by the second comparator, if the angular velocity exceeds the preset angular velocity, the trolley is determined to be too fast to move downwards, a first signal is sent to a ninth input end of the controller, otherwise, a second signal is sent to a ninth input end of the controller, and after the ninth input end of the controller receives the first signal, the brake mechanism is controlled to brake step by step until the angular velocity detected by the angular velocity sensor is smaller than the preset angular velocity.

7. The slope safety pushing enabled cart according to claim 1, wherein said front wheels are all directional wheels and said rear wheels are universal wheels.