CN214460055U - Hand-push type electric tool - Google Patents

Abstract

The utility model provides a hand propelled electric tool, include: a frame; a working assembly; the self-propelled system comprises a control circuit board, at least two hub motors and a travelling wheel driven by the hub motors, wherein the hub motors are connected with the control circuit board; the power system provides power for the working assembly and the self-walking system; an armrest assembly provided with a pair of holding parts for an operator to hold; and the steering control device is respectively connected with each holding part and used for detecting the force acted on the holding part by an operator, the steering control device is connected with the control circuit board, and the control circuit board respectively controls the rotating speed and/or the steering of the corresponding hub motor according to the signal output by the steering control device. The utility model discloses set up the pressure sensor of integral type in the portion of gripping, through the speed of control circuit board control walking wheel, the differential formation of walking wheel about the utilization turns to or zero turns to, and overall structure is simple, convenient to use person controls.

Description

Hand-push type electric tool

Technical Field

The utility model relates to a hand propelled electric tool belongs to garden instrument technical field.

Background

Some hand propelled electric tools in the existing market, such as snowploughs, all use the motor to drive the shaft through one set of drive mechanism and rotate, then drive two walking wheels of installing at the shaft both ends and rotate and realize walking from walking. The set of transmission mechanism is generally belt transmission or gear transmission, but both the belt transmission and the gear transmission have the problems of larger installation size, low transmission efficiency and larger loss. In addition, the existing hand-push type electric tools in the market generally realize the steering of the whole machine by external force, and the steering of the whole machine has the problems of difficult operation, labor waste and inconvenient operation.

In view of the above, there is a need to improve the conventional hand-push type power tool to solve the above problems.

SUMMERY OF THE UTILITY MODEL

One of the purposes of the utility model is to provide a hand-push type electric tool with simple integral structure and convenient control.

In order to achieve the above object, the utility model provides a hand propelled electric tool, include: a frame; the working assembly is arranged on the rack; the self-propelled system is arranged on the rack and comprises a control circuit board, at least two hub motors and a travelling wheel driven by the hub motors, wherein the hub motors are connected with the control circuit board; a power system providing power to the working assembly and the autonomous system; the armrest component is connected with the rack and is provided with a pair of holding parts for an operator to hold; and the steering control device is connected with each holding part respectively and used for detecting the force acted on the holding part by an operator, the steering control device is connected with the control circuit board, and the control circuit board respectively controls the rotating speed and/or the steering of the corresponding hub motor according to a signal output by the steering control device.

As a further improvement of the present invention, the steering control device includes a sensor.

As a further improvement of the present invention, the sensor is a pressure sensor.

As a further improvement of the present invention, the pressure sensor is disposed in a bottom region of the grip portion.

As a further improvement of the present invention, the pressure sensor is disposed in an outside area of the grip portion.

As the utility model discloses a further improvement, a pair of portion of gripping includes left portion of gripping and right portion of gripping, two at least in-wheel motor are including establishing separately the left side in-wheel motor and the right side in-wheel motor of frame both sides, all be provided with in the portion of gripping and the right side of a left side pressure sensor, in order to control respectively the rotational speed and/or the turning to of left side in-wheel motor and right side in-wheel motor.

As a further improvement of the utility model, the steering control device further includes an indicator light, the indicator light with control circuit board connects for show whether pressure sensor is triggered.

As a further improvement of the utility model, the hand-push type electric tool is a snow sweeper.

As a further improvement of the present invention, the working assembly includes a transmission shaft, a fixed snow throwing impeller on the transmission shaft, a snow sweeping assembly connected to the transmission shaft, a front housing for accommodating at least part of the snow sweeping assembly and the snow throwing impeller, and a snow outlet cylinder.

As a further improvement, the driving system includes a battery assembly, the battery assembly is arranged above the walking wheel to increase the friction force between the walking wheel and the ground.

The utility model has the advantages that: the utility model discloses set up the pressure sensor of integral type in the portion of gripping, through the speed of control circuit board control walking wheel, the differential formation of walking wheel about the utilization turns to or zero turns to, and overall structure is simple, convenient to use person controls.

Drawings

Fig. 1 is a perspective view of the hand-push type electric tool of the present invention without a power system.

Fig. 2 is an exploded view of the hand propelled power tool of fig. 1.

Fig. 3 is a flow chart of a steering operation method of the hand-push type electric tool of the present invention.

Fig. 4 is a flowchart of a steering operation method of the hand-push type electric tool according to the first embodiment of the present invention.

Fig. 5 is a flowchart of a second embodiment of the steering operation method of the hand-push type electric tool according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

Examples of these preferred embodiments are illustrated in the accompanying drawings. The embodiments of the invention shown in the drawings and described in accordance with the same are merely exemplary and the invention is not limited to these embodiments.

It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the aspects of the present invention are shown in the drawings, and other details not relevant to the present invention are omitted.

In addition, it is also to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

The utility model discloses a hand-push type electric tool, which can be a snow sweeper 100 and other types of electric tools, and is not described in detail and is not limited. For clarity of description, the following portion of the specification will be described in detail with respect to the snow sweeper 100 as an example.

Referring to fig. 1 and 2, the present invention discloses a snow sweeper 100, wherein the snow sweeper 100 is a snow sweeper with a self-walking function, and comprises a frame 1, a power system 2 mounted on the frame 1, a self-walking system 3 connected to the power system 2, a working assembly 4 for completing snow sweeping, and a handrail assembly 5 connected to the frame 1. It should be understood that the working unit 4 in this embodiment is a snow sweeping unit, but in other garden tools or power tools, the working unit can be changed to other units such as a grass cutting unit according to different specific tasks, and the description thereof is omitted below.

As shown in fig. 2, in the embodiment of the present invention, the power system 2 includes a battery assembly 21 for providing power to the working assembly 4 and the self-propelled system 3. The battery assembly 21 may be composed of one, two or several battery packs, the output voltage of each battery pack is preferably greater than or equal to 40V, and a lithium battery or other suitable batteries may be used. The plurality of battery packs are connected in series for power supply or in parallel for power supply or in combination of series connection and parallel connection for power supply, so that the required electric quantity requirement and voltage requirement can be met, and the electric quantity requirement and the voltage requirement can be set according to actual requirements. Similarly, the number of the battery assemblies 21 can also be set to be a plurality according to actual needs, and the battery assemblies 21 are connected in series, in parallel or in any series-parallel combination to achieve the required electric quantity and voltage demands, and these electric quantity values and voltage values can also be set according to actual needs.

As shown in fig. 2, the armrest assembly 5 is preferably connected to the rear side of the frame 1, that is, the armrest assembly 5 is connected to a side of the frame 1 away from the working assembly 4, the armrest assembly 5 extends upwards and backwards from the rear portion of the frame 1, and includes a left armrest 51a and a right armrest 51b oppositely arranged left and right, a left holding portion 52a for an operator to hold is provided at the top of the left armrest 51a, a right holding portion 52b for an operator to hold is provided at the top of the right armrest 51b, an operation panel 53 is provided between the left holding portion 52a and the right holding portion 52b, a plurality of operation keys or switches are provided on the operation panel 53 and electrically connected to the control circuit board 31 on the self-propelled system 3 for operating the whole machine, and the arrangement of the plurality of keys or switches is of conventional design, and details are not described herein. The handrail assembly 5 can be used for pushing the snow sweeper 100 to move forwards, and can also change the moving speed and the moving direction of the snow sweeper 100, so that an operator can operate the snow sweeper conveniently.

With continued reference to fig. 1 and fig. 2, the self-propelled system 3 is mounted on the frame 1, and preferably disposed near one side of the armrest assembly 5, and includes a control circuit board 31, a self-propelled handle (not shown) disposed on the armrest assembly 5, at least two hub motors 33, and a traveling wheel 32 corresponding to the hub motors 33, where the traveling wheel 32 is correspondingly connected to the hub motors 33 for driving the traveling wheel 32 to rotate via the hub motors 33, in this embodiment, the snow sweeper 100 is provided with a pair of traveling wheels 32 and a pair of hub motors 33 for respectively controlling the traveling wheels 32 to travel, the pair of traveling wheels 32 are respectively mounted on the pair of hub motors 33, and the pair of hub motors 33 and the self-propelled handle are respectively and electrically connected to the control circuit board 31, so that the pair of hub motors 33 is controlled to start by the control circuit board 31 after the self-propelled handle is moved. In other preferred embodiments, the self-propelled handle may also be designed as a self-propelled control button mounted to the operation panel 53.

The snow plow 100 further includes a steering control device 6, and a self-propelled handle or a self-propelled control button are preferably provided near the steering control device 6 for easy manipulation by the operator. It should be noted that, in this embodiment, other electronic components may also be disposed on the control circuit board 31 to implement corresponding functions, and these electronic components may be selected according to specific functions that need to be implemented, which are not listed here. Meanwhile, the control circuit board 31 may be provided in other systems. The utility model discloses in, battery pack 21 sets up in the top of walking wheel 32, so design for the weight of battery package can increase the frictional force of walking wheel 32 and ground, makes walking wheel 32 be difficult for taking place to skid, can improve walking drive power.

The rack 1 further includes a box 11 for accommodating and protecting the control circuit board 31 and various electric wires electrically connected to the control circuit board 31, such as signal wires, power lines, and the like. The pair of in-wheel motors 33 are respectively located at both sides of the case 11, and the pair of traveling wheels 32 are also located at both sides of the case 11.

As shown in fig. 1 and 2, the working assembly 4 includes a transmission shaft 41, a snow throwing impeller 43 directly or indirectly fixed on the transmission shaft 41, a snow sweeping assembly 42 in transmission connection with the transmission shaft 41, a front housing 44 for accommodating at least part of the snow sweeping assembly 42 and the snow throwing impeller 43, a snow outlet barrel 45 and the like, wherein the snow outlet barrel 45 is connected with the front housing 44 for throwing snow swept into the front housing 44 by the snow sweeping assembly 42 through the snow throwing impeller 43.

In the utility model, the structure of directly driving the walking wheels 32 by using the hub motor 33 is mainly applied to the snow sweeper; of course, the present invention may also be applied to other lithium battery powered garden tools, such as carts, riding tools, vehicles, or outdoor power equipment.

In particular, the present invention further provides a steering control device 6 for controlling the steering of the whole machine, and the steering control device 6 is described in detail below with reference to the drawings.

The utility model discloses steering control device 6 sets up on handrail component 5, including setting up left steering control device 6a on left gripping portion 52a and setting up right steering control device 6b on right gripping portion 52 b. The pair of hub motors 33 located on both sides of the box body 11 correspond to the left steering control device 6a and the right steering control device 6b, respectively, the left steering control device 6a is electrically connected with the hub motor 33 located on the left side of the box body 11 (hereinafter, referred to as a left hub motor 33) through the control circuit board 31 to control the road wheels 32 on the corresponding side, and the right steering control device 6b is electrically connected with the hub motor 33 located on the right side of the box body 11 (hereinafter, referred to as a right hub motor 33') through the control circuit board 31 to control the road wheels 32 on the corresponding side, so as to control the steering of the snow sweeper 100.

The utility model discloses in, steering control device 6 configures to and can detect the operator and be used in the effort on handrail assembly 5 pushing snowplow 100 walking in-process, left steering control device 6a, right steering control device 6b all with control circuit board 31 electrical connection, when the operator hand applys certain external force to handrail assembly 5, left steering control device 6a, right steering control device 6b detects the external force of applying on handrail assembly 5 and with the information transfer that detects to control circuit board 31, and then control circuit board 31 control is from the in-wheel motor 33 of walking system 3 and make corresponding action. In actual operation, the steering control device 6 can control the snowplow 100 to steer by detecting the external force applied to the left grip portion 52a and the right grip portion 52b by the operator, without requiring an additional operation, which is very convenient.

As a preferred scheme, the utility model discloses in, left steering control device 6a and right steering control device 6b are the sensor, and further preferably, the utility model discloses a left steering control device 6a and right steering control device 6b are pressure sensor, this pressure sensor electrically connect in control circuit board 31 to trun into the signal of telecommunication with the pressure that the operator hand was applyed and transmit for control circuit board 31. Further, in the present invention, the pressure sensor is preferably a film pressure sensor so as to be mounted on the left grip portion 52a and the right grip portion 52b, and the comfort of the operator when gripping the left grip portion 52a and the right grip portion 52b is not affected by the film pressure sensor. Of course, the left steering control device 6a and the right steering control device 6b of the present invention may be other types of sensors as long as the above functions can be realized, and the present invention is not limited thereto.

In an embodiment of the present invention, there are two pressure sensors, which are respectively integrally disposed on the opposite outer sides of the left and right grips 52a and 52b, that is, the two pressure sensors are respectively located on the opposite sides of the left and right grips 52a and 52b from the left grip 52a and the right grip 52 b.

As shown in fig. 4 and fig. 3, in the first embodiment of the steering operation method of the hand-push type electric tool of the present invention, when the snow sweeper 100 needs to be steered to the right, the hand of the operator will habitually push the handle assembly 5 to the right to make the whole machine turn to the right, at this time, the force of the hand of the operator will be naturally applied to the outer side surface of the right holding portion 52b to generate a certain pressure on the outer side surface of the right holding portion 52b, so as to trigger the right steering control device 6b, i.e. the pressure sensor, on the outer side surface of the right holding portion 52b, the right steering control device 6b will convert the pressure into a signal and send the signal to the control circuit board 31, and the control circuit board 31 receives the signal and then controls the traveling wheel 32 on the right side of the whole machine to move by driving the right-side hub motor 33', so as to control the steering of the whole machine.

When the whole machine needs to be steered to the left, the hand of an operator pushes the handrail assembly 5 to the left habitually, so that the snow sweeper 100 tends to turn to the left, at the moment, the force of the hand of the operator is naturally applied to the outer side surface of the left holding part 52a, certain pressure is generated on the outer side surface of the left holding part 52a, and therefore the left steering control device 6a, namely a pressure sensor, on the outer side surface of the left holding part 52a can be triggered, the pressure is converted into a signal by the left steering control device 6a and sent to the control circuit board 31, the control circuit board 31 controls the left road wheel 32 to move by driving the left hub motor 33, and the process is similar to that of turning to the right.

The utility model discloses control turning to of snowplow 100 with the help of operator's operation habit, and do not need the operator to vacate the hand alone and operate other buttons, it is very convenient to operate to, because two pressure sensor set up respectively in the relative outside of left gripping portion 52a, right gripping portion 52b correspondingly, therefore at the in-process that snowplow 100 was straight, two pressure sensor all can not triggered, and snowplow 100 can be normal straight, realize advancing or retreating.

In another embodiment of the present invention, two pressure sensors are provided, and are respectively integrally disposed on the bottom side of the left grip portion 52a and the bottom side of the right grip portion 52b, which is convenient for the fingers to apply an external force to the pressure sensors upward. In the present embodiment, the pressure sensors are controlled in the same manner as the pressure sensors disposed on the opposite outer sides of the left grip portion 52a and the right grip portion 52b described above. The difference lies in that: in this embodiment, the operator needs to apply an external force to the pressure sensor with a finger, rather than directly generate pressure by natural motion during steering as in the previous embodiments.

In the preferred embodiment of the present invention, the steering control device 6 further includes an indicator lamp (not shown). The indicator light is connected to the control circuit board 31 for feeding back the use status of the left steering control device 6a and the right steering control device 6b in real time, and is preferably provided on the operation panel 53. Because in the embodiment of the utility model, left turn to controlling means 6a and right turn to controlling means 6b are pressure sensor, and not common switch structure form, therefore the operator is difficult to clearly and definitely learn whether left turn to controlling means 6a and right turn to controlling means 6b are triggered, therefore the embodiment of the utility model discloses a set up the pilot lamp and instruct left turn to controlling means 6a and right turn to controlling means 6 b's trigger state to make the operator can learn fast and clearly whether left turn to controlling means 6a and right turn to controlling means 6b is triggered.

The utility model discloses an in the embodiment, when left steering control device 6a or right steering control device 6b were triggered, corresponding signal was received to control circuit board 31, and control circuit board 31 except can sending signal come the action of control corresponding in-wheel motor 33, still can send signal to come control pilot lamp to light or flash, signals to the operator, tells that operator pressure sensor is triggered, whole process operation that turns to is normal. If the left steering control device 6a and the right steering control device 6b have a failure, or if the communications between the left steering control device 6a and the control circuit board 31 have a failure, the control circuit board 31 cannot receive the signals that the left steering control device 6a and the right steering control device 6b are triggered, and the indicator lamp will not light up or flash. The indicator light is arranged, so that an operator can timely know whether the steering control process of the snow sweeper 100 is normally carried out, and the operator can conveniently and quickly make judgment and processing according to actual conditions.

The utility model discloses a steering control device 6's with pilot lamp working process as follows: when the steering wheel is turned, an operator firstly pulls the left holding part 52a or the right holding part 52b under the action of natural operation habits to apply a certain force to the steering control device 6 on the corresponding side, namely, a certain force is applied to the pressure sensor on the corresponding side, after the pressure sensor on the corresponding side is triggered, the control circuit board 31 controls the corresponding indicator light to flicker according to the received signal, and simultaneously controls the corresponding hub motor 33 to stop rotating, and the speed of the hub motor 33 on the other side is unchanged, so that differential steering is realized.

Specifically, when the right steering is required, the operator triggers the pressure sensor on the right holding part 52b, the control circuit board 31 receives the signal and controls the right hub motor 33' to stop rotating, the left hub motor 33 maintains normal rotation, and the whole machine performs the right steering by taking the right traveling wheel 32 as the center; on the contrary, when the left steering is performed, the operator triggers the pressure sensor on the left holding portion 52a, at this time, the control circuit board 31 controls the left hub motor 33 to stop rotating, the right hub motor 33 maintains normal rotation, and the whole machine will steer left with the left road wheel 32 as the center. And after the steering of the whole machine is finished, the indicator light stops flashing.

Further, the utility model discloses a steering control device 6 can also come the classification according to the size of exerting at steering control device 6 upper force to make the complete machine can realize zero in narrow and small space and turn to. Specifically, the force applied to the left and right steering control devices 6a and 6b may be divided into two levels, that is, the force applied to the pressure sensors may be divided into two levels, and when the force applied to the pressure sensors is within a first range, the control circuit board 31 controls the hub motors 33 on the corresponding sides to stop rotating; when the force applied to the pressure sensor is within the second range, the control circuit board 31 sends a signal to control the hub motor 33 on the corresponding side to rotate in the reverse direction, and the hub motor 33 on the side which is not triggered at the moment normally rotates, so that zero steering can be realized. The controllable indicator light flashes rapidly when the applied force is within the second range (with a higher flashing frequency than when within the first range).

More specifically, a node value N is preset, and when the snowplow 100 is turning, if it is detected that the pressure value acting on the pressure sensor is greater than or equal to N, the corresponding in-wheel motor 33 is controlled to rotate in the reverse direction, and if it is detected that the pressure value acting on the pressure sensor is less than N, the corresponding in-wheel motor 33 is controlled to stop rotating. In this process, the pressure sensor measures a pressure value and transmits the pressure value to the control circuit board 31, and the control circuit board 31 may compare a value detected by the pressure sensor with a preset node value N through a comparator, and control the corresponding in-wheel motor 33 to operate according to a comparison result. Since the comparison of the two values is well known to those skilled in the art, it is not described herein.

In this embodiment, N is 25-50 newtons, and N is preferably 25 newtons. When the pressure value of the operator acting on the pressure sensor is greater than or equal to 25 newtons, the hub motor 33 on the corresponding side is controlled to rotate reversely. Further, it is preferable that the rotation of the in-wheel motor 33 on the corresponding side is controlled to be stopped when it is detected that the pressure value applied to the pressure sensor is more than 5 newtons and less than 25 newtons, so that it is possible to prevent the snowplow 100 from turning due to a slight erroneous touch of the operator during the straight running of the snowplow 100. In practical operation, when an operator needs to steer in a narrow space, the operator needs to have a greater steering tendency of the snow sweeper 100, so that the operator can apply a greater force on the left holding portion 52a or the right holding portion 52b, and a pressure value acting on the pressure sensor falls into a second range, so that the snow sweeper 100 is naturally controlled to achieve zero steering, and the requirement of steering the whole snow sweeper in the narrow space is met.

The utility model discloses a snow sweeper 100 can control the mode that turns to of complete machine according to the in-service use environment, can easily realize that the differential turns to and zero turns to can turn to and zero switch over between turning to at the differential, convenient to use, application scope is wide.

Of course, the force applied to the pressure sensor in this embodiment may be a continuously increasing process, that is, the pressure sensor is triggered to control the corresponding in-wheel motor 33 not to stop rotating immediately, but gradually decrease the rotation speed of the corresponding in-wheel motor 33 according to the increasing force applied to the pressure sensor until the in-wheel motor 33 stops rotating. Meanwhile, there is a critical point between the two levels, when the force applied on the pressure sensor reaches the critical point, the control circuit board 31 receives the signal and controls the corresponding in-wheel motor 33 to start to rotate reversely, and then as the force applied on the pressure sensor increases gradually, the control circuit board 31 controls the in-wheel motor 33 on the corresponding side to increase the rotation speed in the direction opposite to the initial direction, so as to realize zero steering in a narrow space.

In the process of using the steering control device 6, when the pressure sensor is triggered, a time delay control scheme can also be adopted: for example, after the pressure sensor is triggered for 3 seconds, the control circuit board 31 controls the hub motor 33 on the corresponding side to perform corresponding actions, and the specific delay length can be set as required.

As shown in fig. 5 in combination with fig. 3, in the second embodiment of the steering operation method of the hand-push type electric tool according to the present invention, the zero steering of the snow sweeper 100 can be realized by pressing the pressure sensor multiple times during the use of the steering control device 6. That is, the one- side grip portion 52a, 52b may be pulled twice in succession to trigger the corresponding pressure sensor, at this time, a state where the turn signal lamp rapidly flickers appears on the operation panel 53 (the flickering speed is faster than that in the differential steering), and at this time, the control circuit board 31 controls the hub motor 33 on the corresponding side to rotate in the reverse direction, that is, if the operator triggers the pressure sensor only once, the control circuit board 31 controls the hub motor 33 on the corresponding side to stop rotating, and if the operator triggers the pressure sensor twice in succession, the control circuit board 31 controls the hub motor 33 on the corresponding side to rotate in the reverse direction, so as to implement zero steering.

To sum up, the utility model discloses set up the pressure sensor of integral type on the portion 52a, 52b of gripping, control walking wheel 32's walking speed through control circuit board 31, the differential formation of walking wheel 32 about utilizing simultaneously turns to or zero turns to, and overall structure is simple, convenient to use person controls.

The above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present invention.

Claims (10)

1. A hand-push type electric tool, comprising:

a frame;

the working assembly is arranged on the rack;

the self-propelled system is arranged on the rack and comprises a control circuit board, at least two hub motors and a travelling wheel driven by the hub motors, wherein the hub motors are connected with the control circuit board;

a power system providing power to the working assembly and the autonomous system;

the armrest component is connected with the rack and is provided with a pair of holding parts for an operator to hold; and

and the steering control device is connected with each holding part and used for detecting the force acted on the holding part by an operator, the steering control device is connected with the control circuit board, and the control circuit board respectively controls the rotating speed and/or the steering of the corresponding hub motor according to a signal output by the steering control device.

2. The hand propelled power tool of claim 1, wherein: the steering control device includes a sensor.

3. The hand propelled power tool of claim 2, wherein: the sensor is a pressure sensor.

4. The hand propelled power tool of claim 3, wherein: the pressure sensor is arranged in the bottom area of the holding part.

5. The hand propelled power tool of claim 3, wherein: the pressure sensor is arranged in the outer area of the holding part.

6. The hand-push type electric tool according to claim 4 or 5, characterized in that: the pair of holding portions comprises a left holding portion and a right holding portion, the at least two hub motors comprise a left hub motor and a right hub motor which are arranged on two sides of the rack respectively, and the pressure sensors are arranged on the left holding portion and the right holding portion and used for controlling the rotating speed and/or the rotating direction of the left hub motor and the right hub motor respectively.

7. The hand propelled power tool of claim 3, wherein: the steering control device further comprises an indicator light, and the indicator light is connected with the control circuit board and used for displaying whether the pressure sensor is triggered or not.

8. The hand propelled power tool of claim 1, wherein: the hand-push type electric tool is a snow sweeper.

9. The hand propelled power tool of claim 8, wherein: the working assembly comprises a transmission shaft, a snow throwing impeller fixed on the transmission shaft, a snow sweeping assembly in transmission connection with the transmission shaft, a front shell used for containing at least part of the snow sweeping assembly and the snow throwing impeller, and a snow outlet barrel.

10. The hand propelled power tool of claim 1, wherein: the power system comprises a battery assembly, and the battery assembly is arranged above the travelling wheels so as to increase the friction force between the travelling wheels and the ground.

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