Handheld power tool and steering operation method thereof

Abstract

The present invention provides a push-type electric tool and a steering operation method thereof. The push-type electric tool includes: a frame; a working component; a self-propelled system, including a control circuit board, at least two hub motors and traveling wheels driven by the hub motors, the hub motors being connected to the control circuit board; a power system for supplying power to the working component and the self-propelled system; a handrail component provided with a pair of holding parts for an operator to hold; and a steering control device respectively connected to each holding part for detecting the force exerted on the holding part by the operator, the steering control device being connected to the control circuit board, and the control circuit board respectively controlling the rotation speed and / or steering of the corresponding hub motor according to the signal output by the steering control device. In the present invention, an integrated pressure sensor is provided on the holding part, the speed of the traveling wheels is controlled by the control circuit board, and differential speed of the left and right traveling wheels is used to form steering or zero-turning. The overall structure is simple and convenient for the user to operate.

Description

Technical Field

[0001] The present invention relates to a push-type electric tool and a steering operation method thereof, belonging to the technical field of garden tools. Background Art

[0002] At present, some push-type electric tools on the market, such as snow blowers, use an electric motor to drive the rotation of a wheel shaft through a set of transmission mechanisms, and then drive the rotation of two walking wheels installed at both ends of the wheel shaft to achieve self-propulsion. This set of transmission mechanisms is generally belt drive or gear drive. However, both belt drive and gear drive have problems such as relatively large installation dimensions, low transmission efficiency, and large losses. In addition, the existing push-type electric tools on the market generally rely entirely on external forces to achieve the steering of the whole machine, and there are problems such as difficult operation, laborious effort, and inconvenient operation in the steering of the whole machine.

[0003] In view of this, it is indeed necessary to improve the existing push-type electric tools to solve the above problems. Summary of the Invention

[0004] One object of the present invention is to provide a push-type electric tool with a simple overall structure and easy to operate.

[0005] Another object of the present invention is to provide a steering operation method for a push-type electric tool that is easy to operate.

[0006] To achieve the above object, the present invention provides a push-type electric tool, including: a frame; a working component installed on the frame; a self-propulsion system installed on the frame, including a control circuit board, at least two hub motors, and walking wheels driven by the hub motors, the hub motors being connected to the control circuit board; a power system that provides power to the working component and the self-propulsion system; an armrest component connected to the frame, the armrest component being provided with a pair of holding parts for the operator to hold; and a steering control device respectively connected to each holding part for detecting the force exerted by the operator on the holding part, the steering control device being connected to the control circuit board, and the control circuit board respectively controlling the rotation speed and / or steering of the corresponding hub motor according to the signal output by the steering control device.

[0007] As a further improvement of the present invention, the steering control device includes a sensor.

[0008] As a further improvement of the present invention, the sensor is a pressure sensor.

[0009] As a further improvement of the present invention, the pressure sensor is arranged in the bottom area of the holding part.

[0010] As a further improvement of the present invention, the pressure sensors are respectively arranged in the outer areas of the pair of holding parts.

[0011] As a further improvement of the present invention, the steering control device further includes an indicator light, which is connected to the control circuit board and used to indicate whether the pressure sensor is triggered.

[0012] As a further improvement of the present invention, the push-type electric tool is a snow sweeper.

[0013] To achieve the above object, the present invention also provides a steering operation method for a push-type electric tool, which is applied to the aforementioned push-type electric tool. The steering operation method for the push-type electric tool includes:

[0014] After the operator triggers the steering control device on the holding part, the steering control device detects the force exerted by the operator on the holding part and outputs a signal to the control circuit board. After receiving the signal, the control circuit board controls the corresponding hub motor to change the speed and / or steering.

[0015] As a further improvement of the present invention, when the force applied to the steering control device is within the first range, the control circuit board controls the corresponding hub motor to stop rotating; when the force applied to the steering control device is within the second range, the control circuit board controls the corresponding hub motor to rotate in the reverse direction.

[0016] As a further improvement of the present invention, the first range is 5 to 25 Newtons, and the second range is greater than or equal to 25 Newtons.

[0017] As a further improvement of the present invention, the force applied to the steering control device is a continuously increasing process. There is a critical point between the first range and the second range. When the force applied to the steering control device reaches this critical point, the control circuit board controls the corresponding hub motor to start reversing. As the force applied to the steering control device gradually increases, the control circuit board controls the corresponding hub motor to increase the rotation speed to achieve zero turn.

[0018] As a further improvement of the present invention, when the corresponding steering control device is triggered by continuously pulling the holding part on one side twice, the steering control device sends a signal to the control circuit board, so that the control circuit board controls the hub motor on the corresponding side to rotate in the reverse direction.

[0019] The beneficial effects of the present invention are as follows: The present invention provides an integrated pressure sensor on the holding part, controls the speed of the walking wheels through the control circuit board, and forms steering or zero turn by using the differential speed of the left and right walking wheels. The overall structure is simple and convenient for the user to operate. Description of the Drawings

[0020] Figure 1 It is a three-dimensional view of the push-type electric tool of the present invention with the power system omitted.

[0021] Figure 2 is Figure 1 the exploded view of the push-type power tool shown

[0022] Figure 3 is the flow chart of the steering operation method of the push-type power tool of the present invention

[0023] Figure 4 is the flow chart of the first embodiment of the steering operation method of the push-type power tool of the present invention

[0024] Figure 5 is the flow chart of the second embodiment of the steering operation method of the push-type power tool of the present invention Detailed Embodiments

[0025] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments

[0026] Examples of these preferred embodiments are illustrated in the accompanying drawings. The embodiments of the present invention shown in the drawings and described according to the drawings are merely exemplary, and the present invention is not limited to these embodiments

[0027] Here, it should also 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 solution of the present invention are shown in the drawings, while other details less related to the present invention are omitted

[0028] In addition, it should also be noted that the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device

[0029] The present invention discloses a push-type power tool, which may be a snow sweeper 100 or other types of power tools, which will not be described in detail herein and are not subject to any limitations. For the sake of clear description, the following description part of the specification will take the snow sweeper 100 as an example for detailed description

[0030] Please refer to Figure 1 and Figure 2As shown in the figure, the present invention discloses a snow sweeper 100, which is a snow sweeper with a self-propelled function, including a frame 1, a power system 2 installed on the frame 1, a self-propelled system 3 connected to the power system 2, a working component 4 for completing snow sweeping work, and a handrail component 5 connected to the frame 1. It can be understood that the working component 4 in this embodiment is a snow sweeping component. However, in other gardening tools or power tools, the working component can be changed to other components such as a mowing component according to the specific work, which will not be listed hereinafter.

[0031] As Figure 2 shown, in an embodiment of the present invention, the power system 2 includes a battery assembly 21 for providing energy for the working component 4 and the self-propelled system 3. The battery assembly 21 can be composed of one, two or several battery packs. The output voltage of a single battery pack is preferably greater than or equal to 40V, and lithium batteries or other suitable batteries can be selected. The several battery packs are powered in series, in parallel or in a combination of series and parallel to meet the required power and voltage requirements, which can be set according to actual needs. Similarly, the number of the battery assemblies 21 can also be set to several according to actual needs, and the battery assemblies 21 are connected in series, in parallel or in any series-parallel combination to meet the required power and voltage requirements, and these power values and voltage values can also be set according to actual needs.

[0032] As Figure 2 shown, the handrail component 5 is preferably connected to the rear side of the frame 1, that is, the handrail component 5 is connected to the side of the frame 1 away from the working component 4. The handrail component 5 extends upward and backward from the rear of the frame 1, including a left handrail 51a and a right handrail 51b arranged oppositely left and right. The top of the left handrail 51a is provided with a left gripping part 52a for the operator to hold, and the top of the right handrail 51b is provided with a right gripping part 52b for the operator to hold. An operation panel 53 is arranged between the left gripping part 52a and the right gripping part 52b. A number of operation buttons or switches on the operation panel 53 are electrically connected to the control circuit board 31 on the self-propelled system 3 for controlling the whole machine. The setting of the several buttons or switches belongs to a conventional design, and the details will not be elaborated here. The handrail component 5 can not only be used to push the snow sweeper 100 forward, but also change the traveling speed and direction of the snow sweeper 100, which is convenient for the operator to operate.

[0033] Please continue to refer to Figure 1 、 Figure 2As shown, the self-propelled system 3 is installed on the frame 1, and is preferably arranged near the side of the handrail assembly 5, including a control circuit board 31, a self-propelled handle (not shown) arranged on the handrail assembly 5, at least two wheel hub motors 33 and a walking wheel 32 corresponding to the wheel hub motor 33, the walking wheel 32 is connected to the wheel hub motor 33, and is used to drive the walking wheel 32 to rotate through the wheel hub motor 33. In this embodiment, the snowplow 100 is provided with a pair of walking wheels 32 and a pair of wheel hub motors 33 for respectively controlling the walking of the pair of walking wheels 32, the pair of walking wheels 32 are respectively installed on a pair of wheel hub motors 33, and the pair of wheel hub motors 33 and the self-propelled handle are respectively electrically connected to the control circuit board 31, so that after the self-propelled handle is pulled, the control circuit board 31 is used to control the start of the pair of wheel hub motors 33. In other preferred embodiments, the self-propelled handle can also be designed as a self-propelled control button installed on the operation panel 53.

[0034] The snowplow 100 also includes a steering control device 6, and the self-propelled handle or self-propelled control button is preferably arranged near the steering control device 6 to facilitate manual operation by the operator. It should be noted that, in the present embodiment, other electronic components may be arranged on the control circuit board 31 to realize corresponding functions. Such electronic components may be selected according to the specific functions to be realized, and are not listed one by one here. At the same time, the control circuit board 31 may also be arranged in other systems. In the present invention, the battery assembly 21 is arranged above the walking wheel 32. Such a design enables the weight of the battery pack to increase the friction between the walking wheel 32 and the ground, making the walking wheel 32 less likely to slip, thereby improving the walking driving force.

[0035] The frame 1 further includes a box 11 for accommodating and protecting a control circuit board 31 and various wires electrically connected to the control circuit board 31, such as signal wires, power wires, etc. The pair of wheel hub motors 33 are respectively located on both sides of the box 11, and the pair of running wheels 32 are also located on both sides of the box 11.

[0036] like Figure 1 , Figure 2 As shown, the working component 4 includes a transmission shaft 41, a snow throwing impeller 43 directly or indirectly fixed to the transmission shaft 41, a snow sweeping component 42 transmission-connected to the transmission shaft 41, a front shell 44 for accommodating at least part of the snow sweeping component 42 and the snow throwing impeller 43, and a snow discharge cylinder 45 and other components. The snow discharge cylinder 45 is connected to the front shell 44 to throw out the snow swept into the front shell 44 by the snow sweeping component 42 through the snow throwing impeller 43.

[0037] In the present invention, the structure of using the hub motor 33 to directly drive the travel wheel 32 is mainly used in snowplows; of course, it can also be used in other lithium-powered garden tools, such as carts, riding tools, vehicles or outdoor power equipment.

[0038] In particular, the present invention further provides a steering control device 6 for controlling the steering of the whole machine. The steering control device 6 will be described in detail below with reference to the drawings.

[0039] The steering control device 6 of the present invention is arranged on the armrest assembly 5, and includes a left steering control device 6a arranged on the left holding part 52a and a right steering control device 6b arranged on the right holding part 52b. The pair of hub motors 33 located on both sides of the box body 11 respectively correspond to the left steering control device 6a and the right steering control device 6b. The left steering control device 6a is electrically connected to the hub motor 33 (hereinafter simply referred to as the left hub motor 33) located on the left side of the box body 11 through the control circuit board 31 to control the corresponding walking wheel 32, and the right steering control device 6b is electrically connected to the hub motor 33 (hereinafter simply referred to as the right hub motor 33') located on the right side of the box body 11 through the control circuit board 31 to control the corresponding walking wheel 32, thereby realizing the control of the steering of the snow sweeper 100.

[0040] In the present invention, the steering control device 6 is configured to be able to detect the force exerted on the armrest assembly 5 by the operator during the process of pushing the snow sweeper 100 to move. Both the left steering control device 6a and the right steering control device 6b are electrically connected to the control circuit board 31. When the operator's hand exerts a certain external force on the armrest assembly 5, the left steering control device 6a and the right steering control device 6b detect the external force applied to the armrest assembly 5 and transmit the detected information to the control circuit board 31, and then the control circuit board 31 controls the hub motor 33 of the self-propelled system 3 to make corresponding actions. During actual operation, the steering control device 6 can control the snow sweeper 100 to turn by detecting the external forces applied to the left holding part 52a and the right holding part 52b by the operator, without the need for additional actions, which is very convenient.

[0041] As a preferred solution, in the present invention, the left steering control device 6a and the right steering control device 6b are sensors. Further preferably, both the left steering control device 6a and the right steering control device 6b of the present invention are pressure sensors, and the pressure sensors are electrically connected to the control circuit board 31 to facilitate converting the pressure applied by the operator's hand into an electrical signal and transmitting it to the control circuit board 31. In addition, in the present invention, the pressure sensor is preferably a thin-film pressure sensor to facilitate installation on the left holding part 52a and the right holding part 52b, and using the thin-film pressure sensor will not affect the comfort of the operator when holding the left holding part 52a and the right holding part 52b. Of course, the left steering control device 6a and the right steering control device 6b of the present invention can also be other types of sensors, as long as the above functions can be achieved, and no limitation is made here.

[0042] In one embodiment of the present invention, there are two pressure sensors, which are respectively and integrally arranged on the relatively outer sides of the left grip 52a and the right grip 52b, that is, the two pressure sensors are respectively located on the side of the left grip 52a and the right grip 52b that is away from the left grip 52a and the right grip 52b.

[0043] like Figure 4 Combined with Figure 3 As shown, in the first embodiment of the steering operation method of a hand-push electric tool of the present invention, during the movement of the snowblower 100, when the whole machine needs to be turned to the right, the operator's hand will habitually push the armrest assembly 5 to the right to make the whole machine tend to turn right. At this time, the force of the operator's hand will naturally be applied to the outer surface of the right grip 52b, generating a certain pressure on the outer surface of the right grip 52b, thereby triggering the right steering control device 6b, i.e., the pressure sensor, on the outer surface of the right grip 52b. The right steering control device 6b converts the pressure into a signal and sends it to the control circuit board 31. After receiving the signal, the control circuit board 31 controls the movement of the right walking wheel 32 by driving the right wheel hub motor 33', and then controls the whole machine to steer.

[0044] When the whole machine needs to turn left, the operator's hand will habitually push the armrest assembly 5 to the left to make the snowplow 100 tend to turn left. At this time, the force of the operator's hand will naturally be applied to the outer side of the left grip 52a, generating a certain pressure on the outer side of the left grip 52a, thereby triggering the left steering control device 6a, i.e., the pressure sensor, located on the outer side of the left grip 52a. The left steering control device 6a converts the pressure into a signal and sends it to the control circuit board 31. The control circuit board 31 controls the movement of the left walking wheel 32 by driving the left wheel hub motor 33. The process is similar to turning right.

[0045] The present invention controls the steering of the snowplow 100 with the help of the operator's operating habits, and the operator does not need to free up his hands to operate other buttons separately. The operation is very convenient. In addition, since the two pressure sensors are respectively arranged on the relatively outer sides of the left grip 52a and the right grip 52b, when the snowplow 100 moves straight, the two pressure sensors will not be triggered, and the snowplow 100 can move straight normally and move forward or backward.

[0046] In another embodiment of the present invention, there are two pressure sensors, which are integrally provided on the bottom sides of the left holding part 52a and the right holding part 52b respectively. This position is convenient for applying an external force to the pressure sensors upward with fingers. In this embodiment, the control mode of the pressure sensors is the same as that of the pressure sensors provided on the relatively outer sides of the left holding part 52a and the right holding part 52b described above. The difference is that in this embodiment, the operator needs to apply an external force to the pressure sensors with fingers, rather than generating pressure by natural movements directly during steering as in the previous embodiment.

[0047] In a preferred embodiment of the present invention, the steering control device 6 further includes an indicator light (not shown). The indicator light is connected to the control circuit board 31 and is used to feedback the usage status of the left steering control device 6a and the right steering control device 6b in real time. The indicator light is preferably provided on the operation panel 53. Since in the embodiments of the present invention, both the left steering control device 6a and the right steering control device 6b are pressure sensors, rather than the common switch structure form, it is difficult for the operator to clearly know whether the left steering control device 6a and the right steering control device 6b are triggered. Therefore, the embodiments of the present invention provide an indicator light to indicate the triggering status of the left steering control device 6a and the right steering control device 6b, so that the operator can quickly and clearly know whether the left steering control device 6a and the right steering control device 6b are triggered.

[0048] In the embodiments of the present invention, when the left steering control device 6a or the right steering control device 6b is triggered, the control circuit board 31 receives the corresponding signal. In addition to sending a signal to control the corresponding hub motor 33 to operate, the control circuit board 31 also sends a signal to control the indicator light to light up or flash, sending a signal to the operator to inform the operator that the pressure sensor is triggered and the entire steering process is operating normally. If the left steering control device 6a or the right steering control device 6b itself fails, or if there is a communication failure between the left steering control device 6a, the right steering control device 6b and the control circuit board 31, then the control circuit board 31 cannot receive the signal that the left steering control device 6a and the right steering control device 6b are triggered, and the indicator light will not light up or flash. Setting this indicator light enables the operator to timely know whether the steering control process of the snow sweeper 100 is proceeding normally, facilitating the operator to quickly make a judgment and handling according to the actual situation.

[0049] The working process of the steering control device 6 with an indicator light of the present invention is as follows: When steering, the operator first pulls the left holding part 52a or the right holding part 52b under the action of natural operating habits, applying a certain force to the steering control device 6 on the corresponding side, that is, applying a certain force 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 flash according to the received signal, and at the same time controls the corresponding hub motor 33 to stop rotating, while the speed of the hub motor 33 on the other side remains unchanged, realizing differential turning.

[0050] Specifically, when a right turn is required, the operator triggers the pressure sensor on the right holding part 52b. After the control circuit board 31 receives the signal, it controls the right hub motor 33' to stop rotating, and the left hub motor 33 maintains normal rotation. Then the whole machine will turn right with the right traveling wheel 32 as the center; conversely, when turning left, the operator triggers the pressure sensor on the left holding part 52a. At this time, the control circuit board 31 controls the left hub motor 33 to stop rotating, and the right hub motor 33 maintains normal rotation. Then the whole machine will turn left with the left traveling wheel 32 as the center. After the whole machine finishes turning, the indicator light stops flashing.

[0051] Furthermore, the steering control device 6 of the present invention can also divide grades according to the magnitude of the force applied to the steering control device 6, so that the whole machine can achieve zero turning in a narrow space. Specifically, the force applied to the left steering control device 6a and the right steering control device 6b can be divided into two grades, that is, the force applied to the pressure sensor is divided into two grades. When the force applied to the pressure sensor is within the first range, the control circuit board 31 controls the hub motor 33 on the corresponding side 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. At this time, the hub motor 33 on the untriggered side rotates normally, and zero turning can be achieved at this time. When the applied force is within the second range, the indicator light can be controlled to flash quickly (the flashing frequency is higher than that within the first range).

[0052] More specifically, first preset a node value N. When the snow sweeper 100 steers, if it is detected that the pressure value acting on the pressure sensor is greater than or equal to N, the corresponding hub motor 33 is controlled to rotate in the reverse direction. If it is detected that the pressure value acting on the pressure sensor is less than N, the corresponding hub motor 33 is controlled to stop rotating. In this process, first, the pressure sensor measures the pressure value and transmits the pressure value to the control circuit board 31. The control circuit board 31 can compare the value detected by the pressure sensor with the preset node value N through a comparator, etc., and control the corresponding hub motor 33 to act according to the comparison result. Since the comparison method of the magnitudes of the two values is a technique well-known to those skilled in the art, it will not be elaborated here.

[0053] In this embodiment, N is 25 - 50 Newtons, and N is preferably 25 Newtons. When the pressure value applied by the operator on the pressure sensor is greater than or equal to 25 Newtons, the hub motor 33 on the corresponding side is controlled to rotate in the reverse direction. In addition, preferably, when it is detected that the pressure value applied on the pressure sensor is greater than 5 Newtons and less than 25 Newtons, the hub motor 33 on the corresponding side is controlled to stop rotating. With such a setting, it is possible to avoid the snow sweeper 100 from turning due to a slight accidental touch by the operator during the straight - line movement of the snow sweeper 100. In actual operation, when the operator needs to turn in a narrow space, the operator needs a greater turning tendency of the snow sweeper 100. Therefore, the operator will apply a greater force on the left grip portion 52a or the right grip portion 52b, and the pressure value applied on the pressure sensor will fall into the second range, thus naturally controlling the snow sweeper 100 to achieve zero - turn, meeting the requirement of the whole machine turning in a narrow space.

[0054] The snow sweeper 100 of the present invention can control the turning mode of the whole machine according to the actual use environment, can easily achieve differential turning and zero - turn, and can switch between differential turning and zero - turn, which is convenient to use and has a wide range of applications.

[0055] Of course, the force applied to the pressure sensor in this embodiment can be a continuously increasing process, that is, after the pressure sensor is triggered, the corresponding hub motor 33 is not immediately controlled to stop rotating, but the rotation speed of the hub motor 33 on the corresponding side is gradually reduced according to the gradually increasing force applied to the pressure sensor until the hub motor 33 stops rotating. At the same time, there is a critical point between the two levels. When the force applied to the pressure sensor reaches this critical point, the control circuit board 31 receives the signal and controls the corresponding hub motor 33 to start reversing. Then, as the force applied to the pressure sensor gradually increases, the control circuit board 31 controls the hub motor 33 on the corresponding side to increase the rotation speed in the direction opposite to the initial direction, realizing zero - turn in a narrow space.

[0056] During the use of the steering control device 6, when the pressure sensor is triggered, a delay control scheme can also be adopted: for example, 3 seconds after the pressure sensor is triggered, 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 according to needs.

[0057] Such as Figure 5 And in combination with Figure 3As shown, in the second embodiment of the steering operation method of the push-type electric tool of the present invention, during the use of the steering control device 6, the zero-turn of the snow sweeper 100 can also be achieved by pressing the pressure sensor multiple times. That is, the one-side holding parts 52a and 52b can be pulled twice continuously to trigger the corresponding pressure sensors. At this time, the steering indicator light on the operation panel 53 flashes quickly (the flashing speed is faster than that during differential steering), and at this time, the control circuit board 31 controls the corresponding side wheel hub motor 33 to rotate in the reverse direction. That is, if the operator triggers the pressure sensor only once, the control circuit board 31 controls the corresponding side wheel hub motor 33 to stop rotating. If the operator triggers the pressure sensor twice continuously, the control circuit board 31 controls the corresponding side wheel hub motor 33 to rotate in the reverse direction to achieve zero-turn.

[0058] In summary, the present invention is provided with an integrated pressure sensor on the holding parts 52a and 52b, controls the traveling speed of the traveling wheels 32 through the control circuit board 31, and at the same time forms steering or zero-turn by using the differential speed of the left and right traveling wheels 32. The overall structure is simple and convenient for the user to operate.

[0059] The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A push-type electric tool, characterized in that, include: frame; A working assembly, mounted on the frame; A self-propelled system, mounted on the frame, comprising a control circuit board, at least two wheel hub motors and a travel wheel driven by the wheel hub motors, wherein the wheel hub motors are connected to the control circuit board; A power system, the power system comprising a battery assembly for providing energy for the working assembly and the self-propelled system; An armrest assembly connected to the frame, the armrest assembly being provided with a pair of gripping parts for an operator to grip; as well as A steering control device is connected to each gripping portion, respectively, to detect the force applied by the operator on the gripping portion, the steering control device includes a pressure sensor, the steering control device is connected to the control circuit board, and the control circuit board controls the speed and / or direction of the corresponding hub motor according to the signal output by the steering control device.

2. The push-type electric tool according to claim 1, wherein: The pressure sensor is arranged in the bottom area of the grip portion.

3. The push-type electric tool according to claim 1, characterized in that: The pressure sensors are respectively arranged in the outer areas of the pair of gripping parts.

4. The push-type electric tool according to claim 1, characterized in that: The steering control device also includes an indicator light, which is connected to the control circuit board and is used to display whether the pressure sensor is triggered.

5. The push-type electric tool according to claim 1, characterized in that: The hand-push electric tool is a snow blower.

6. A steering operation method for a push-type electric tool, which is applied to the push-type electric tool according to any one of claims 1-5, characterized in that: The steering operation method of the hand-push electric tool comprises: After the operator triggers the steering control device on the grip, the steering control device detects the force applied by the operator on the grip and outputs a signal to the control circuit board. After receiving the signal, the control circuit board controls the corresponding wheel hub motor to change the speed and / or direction.

7. The steering operation method of the push-type electric tool according to claim 6, characterized in that: When the force applied to the steering control device is within a first range, the control circuit board controls the corresponding wheel hub motor to stop rotating; when the force applied to the steering control device is within a second range, the control circuit board controls the corresponding wheel hub motor to rotate in the opposite direction.

8. The steering operation method of the push-type electric tool according to claim 7, characterized in that: The first range is 5 to 25 Newtons, and the second range is greater than 25 Newtons.

9. The steering operation method of the push-type electric tool according to claim 7, wherein: The force applied to the steering control device is a continuously increasing process. There is a critical point between the first range and the second range. When the force applied to the steering control device reaches the critical point, the control circuit board controls the corresponding wheel hub motor to start reversing. As the force applied to the steering control device gradually increases, the control circuit board controls the corresponding wheel hub motor to increase the rotation speed to achieve zero steering.

10. The steering operation method of the push-type electric tool according to claim 6, characterized in that: When the gripping portion on one side is pulled twice in succession to trigger the corresponding steering control device, the steering control device sends a signal to the control circuit board, so that the control circuit board controls the wheel hub motor on the corresponding side to rotate in the opposite direction.

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