Hand-push power tools

Abstract

The present invention provides a hand-push power tool, comprising: a frame; a working assembly mounted on the frame; a self-propelled system mounted on the frame and comprising at least two wheel hub motors and travel wheels controlled by the wheel hub motors; a power system providing power to the working assembly and the self-propelled system; an armrest assembly mounted on the frame and for an operator to hold; and a steering control device mounted on the armrest assembly and electrically connected to the self-propelled system, the steering control device comprising an operating member and an adjustment assembly, wherein the operating member is operated to drive the adjustment assembly to adjust the current of the wheel hub motors to control the speed and / or direction of the wheel hub motors. Compared to the prior art, the hand-push power tool of the present invention has a simple overall structure and is easy for the user to operate.

Description

Technical Field

[0001] The invention relates to a hand-push electric tool, belonging to the technical field of garden tools. Background Art

[0002] Some hand-push power tools currently on the market, such as snow blowers, use a motor to drive a wheel axle through a transmission mechanism, which in turn drives two running wheels mounted on either end of the axle to achieve self-propelled movement. This transmission mechanism is typically a belt drive or a gear drive. However, both belt and gear drives suffer from large installation dimensions, low transmission efficiency, and high losses. Furthermore, existing hand-push power tools on the market generally rely entirely on external force to achieve steering, which can be difficult, labor-intensive, and inconvenient to operate.

[0003] In view of this, it is indeed necessary to propose improvements to existing hand-propelled power tools to solve the above problems. Summary of the Invention

[0004] An object of the present invention is to provide a hand-push electric tool which utilizes the differential speed of left and right running wheels to form steering or zero steering, has a simple overall structure, and is easy for users to operate.

[0005] To achieve the above-mentioned objectives, the present invention provides a hand-propelled power tool, comprising: a frame; a working component mounted on the frame; a self-propelled system mounted on the frame, comprising at least two hub motors and traveling wheels controlled by the hub motors; a power system, wherein the power system provides power to the working component and the self-propelled system; an armrest assembly mounted on the frame and for an operator to hold; and a steering control device mounted on the armrest assembly and electrically connected to the self-propelled system, wherein the steering control device comprises an operating member and an adjustment member, and when the operating member is operated, the operating member drives the adjustment member to adjust the current of the hub motor so as to control the speed and / or direction of the hub motor.

[0006] As a further improvement of the present invention, the steering control device also includes a fixed plate, which is connected to the armrest assembly. The operating member is rotatably connected to the fixed plate. The operating member includes an operating part and a shell, which is connected to the operating part, and the adjustment assembly is accommodated in the shell.

[0007] As a further improvement of the present invention, the adjustment component includes a resistance ring and a slider, one end of the slider is in contact with the resistance ring, and the slider can slide relative to the resistance ring.

[0008] As a further improvement of the present invention, the resistance coil is connected to the fixed plate, and the slider is connected to the housing.

[0009] As a further improvement of the present invention, the steering control device also includes an end cover, which is located on the side of the operating member away from the fixed plate, and a first latch tooth is provided on the end cover. The side of the operating member facing the end cover is provided with a second latch tooth that cooperates with the first latch tooth.

[0010] As a further improvement of the present invention, the resistance ring and the slider are combined to form a variable resistor, and the slider can slide between three positions, including: the 0 point position, the initial position where the hub motor speed does not change; the P point position, the position for controlling the reversal of the hub motor; and the R point position, the position for controlling the reversal speed of the hub motor to reach the maximum.

[0011] As a further improvement of the present invention, the steering control device also includes a position sensor, which is connected to the control circuit board in the self-propelled system. When the slider slides to the point P position, the position sensor transmits the detected position information of the slider to the control circuit board, so that the control circuit board controls the hub motor to start reverse rotation.

[0012] As a further improvement of the present invention, the steering control device further includes a pressing member and a return element, wherein the pressing member is held between the housing and the fixing plate, and the return element is accommodated in the housing to drive the operating member to reset.

[0013] As a further improvement of the present invention, a limiting column is provided on the shell, and an arc-shaped hole is formed on the fixing plate. The arc-shaped hole is used to cooperate with a corresponding limiting column formed on the shell to limit the rotation angle range of the operating member.

[0014] As a further improvement of the present invention, the armrest assembly includes a pair of handlebars, and the steering control device includes a left steering control device and a right steering control device respectively mounted on the pair of handlebars.

[0015] As a further improvement of the present invention, the hand-push electric tool is a snow blower.

[0016] The beneficial effects of the present invention are as follows: the hand-push power tool of the present invention is provided with a steering control device on the armrest assembly, which controls the speed of the travel wheel by adjusting the current of the hub motor, and utilizes the differential speed of the left and right travel wheels to form steering or zero steering. The overall structure is simple and easy for users to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a partial exploded perspective view of the hand-push electric tool of the present invention.

[0018] Figure 2 yes Figure 1Exploded view of the walk-behind power tool shown.

[0019] Figure 3 yes Figure 1 A perspective view of the center steering control.

[0020] Figure 4 yes Figure 3 A cross-sectional view of the steering control assembly is shown.

[0021] Figure 5 yes Figure 3 Exploded view of the steering controls shown.

[0022] Figure 6 yes Figure 3 Exploded view of the steering control shown from another angle.

[0023] Figure 7 yes Figure 5 Side view of the operating part.

[0024] Figure 8 yes Figure 7 The operating member is shown in a perspective view with the adjustment assembly removed.

[0025] Figure 9 yes Figure 7 A perspective view of the middle adjustment assembly.

[0026] Figure 10 It is the circuit schematic between the regulating component and the control circuit board. DETAILED DESCRIPTION

[0027] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Examples of these preferred embodiments are illustrated in the accompanying drawings.The embodiments of the invention shown in and described with reference to the drawings are exemplary only, and the invention is not limited to these embodiments.

[0029] It should also be noted here that, in order to avoid obscuring the present invention due to unnecessary details, only structures and / or processing steps closely related to the solutions of the present invention are shown in the drawings, while other details that are not closely related to the present invention are omitted.

[0030] In addition, it should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0031] The present invention discloses a hand-push power tool, which can be a snowplow 100 or other types of power tools. Detailed description and no limitation are given herein. For clarity, the following description will be described in detail using the snowplow 100 as an example.

[0032] like Figure 1 and Figure 2 As shown, the present invention discloses a snowplow 100, which is a two-step snowplow with self-propelled function. The snowplow 100 includes a frame 1, a power system 2 mounted on the frame 1, a self-propelled system 3 connected to the power system 2, a working assembly 4 for performing snow-clearing operations, and a handrail assembly 5 located behind the power system 2. It will be understood that the working assembly 4 in this embodiment is a snow-clearing assembly, but in other garden tools or power tools, the working assembly can be transformed into other components, such as a lawn mowing assembly, depending on the specific operation, and this will not be further described below.

[0033] like Figure 1 and Figure 2 As shown, in an embodiment of the present invention, the power system 2 includes a battery assembly 21 for providing energy for the working assembly 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. Lithium batteries or other suitable batteries can be used. The several battery packs are connected in series or in parallel or in combination of series and parallel to achieve the required power and voltage requirements, which can be set according to actual needs. Similarly, the number of battery assemblies 21 can also be set to several according to actual needs, and the battery assemblies 21 can achieve the required power and voltage requirements by being connected in series, in parallel or in any series-parallel combination. These power values ​​and voltage values ​​can also be set according to actual needs.

[0034] Please continue to participate Figure 1 and Figure 2 As shown, the armrest assembly 5 extends upward and backward from the rear of the frame 1 and includes a left armrest 51a and a right armrest 51b arranged opposite each other. A left handle 52a is located on top of the left armrest 51a, and a right handle 52b is located on top of the right armrest 51b. An operating panel 53 is connected between the left and right handles 52a and 52b. The operating panel 53 is provided with a number of operating buttons or switches electrically connected to the control circuit board 30 of the self-propelled system 3 for controlling the entire machine. The arrangement of these buttons or switches is conventional and will not be described in detail here. The armrest assembly 5 not only propels the snowplow 100 forward, but also adjusts the speed and direction of the snowplow 100, facilitating operation by the operator.

[0035] It should be noted that in this embodiment, the control circuit board 30 may also be provided with other electronic components or indicator lights to implement corresponding functions or display the real-time operating status of the snowplow 100. Such electronic components can be selected based on the specific functions to be implemented and are not listed here. At the same time, the control circuit board 30 may also be provided in other systems.

[0036] See also Figure 2 Combined with Figure 1 As shown, the self-propelled system 3 is installed on the frame 1 and is preferably arranged near the side of the handrail assembly 5. It includes a control circuit board 30, a self-propelled pressure handle (not shown) arranged on the handrail assembly 5, at least two hub motors 33 and running wheels 32 corresponding to the hub motors 33. The running wheels 32 are connected to the hub motors 33 to drive the running wheels 32 to rotate through the hub motors 33. In this embodiment, the snowplow 100 is provided with a pair of running wheels 32, a pair of hub motors 33 for respectively controlling the self-propelled running of the pair of running wheels 32, and a transmission assembly 34 mechanically connected to the pair of hub motors 33. The pair of hub motors 33 and the self-propelled pressure handle are respectively electrically connected to the control circuit board 30, so that after the self-propelled pressure handle is pulled, the control circuit board 30 controls the start of the pair of hub motors 33. In other preferred embodiments, the self-propelled pressure handle can also be designed as a self-propelled control button installed on the operation panel 53.

[0037] The snowplow 100 also includes a steering control device 6. A self-propelled pressure handle or self-propelled control button is located near the steering control device 6 to facilitate manual operation by the operator. The connection between the transmission assembly 34 and the hub motor 33 is of conventional design and will not be described in detail here. In the present invention, the battery assembly 21 is located above the running wheels 32. This design allows the weight of the battery pack to increase the friction between the running wheels 32 and the ground, making the running wheels 32 less likely to slip and thus improving the driving force.

[0038] The frame 1 also includes a housing 11 for housing and protecting a control circuit board 30 and various wires electrically connected to the control circuit board 30, such as signal wires and power wires. The pair of wheel hub motors 33 are located on either side of the housing 11, and the pair of running wheels 32 are also located on either side of the housing 11.

[0039] Please continue reading Figure 2 Combined with Figure 1As shown, the working assembly 4 includes a drive shaft 41, a snow throwing impeller 43 directly or indirectly fixed to the drive shaft 41, a snow sweeping assembly 42 drivingly connected to the drive shaft 41, a front housing 44 for accommodating at least a portion of the snow sweeping assembly 42 and the snow throwing impeller 43, and a snow discharge cylinder 45. The snow discharge cylinder 45 is connected to the front housing 44 and is used to discharge snow swept into the front housing 44 by the snow sweeping assembly 42 via the snow throwing impeller 43. In the present invention, the structure of directly driving the working assembly 4 using the hub motor 33 is mainly used in a two-step snow sweeper; of course, it can also be applied to other lithium-powered garden tools, such as carts, riding tools, vehicles, or outdoor power equipment.

[0040] In particular, the present invention further provides a steering control device 6 for controlling the steering of the entire machine. The steering control device 6 is described in detail below with reference to the accompanying drawings.

[0041] See also Figures 1 to 9 As shown, the steering control device 6 of the present invention is disposed on the armrest assembly 5 and includes a left steering control device 6a disposed on the left handlebar 52a and a right steering control device 6b disposed on the right handlebar 52b. The pair of wheel hub motors 33 located on both sides of the housing 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 to the wheel hub motor 33 located on the left side of the housing 11 (hereinafter referred to as the left wheel hub motor 33) via the control circuit board 30, thereby controlling the running wheel 32 located on the left side of the housing 11. The right steering control device 6b is electrically connected to the wheel hub motor 33 located on the right side of the housing 11 (hereinafter referred to as the right wheel hub motor 33') via the control circuit board 30, thereby controlling the running wheel 32 located on the right side of the housing 11, thereby achieving steering control of the snowplow 100.

[0042] In the present invention, the left steering control device 6a and the right steering control device 6b have the same structure. Therefore, the present invention will use the left steering control device 6a as an example for detailed description. The left steering control device 6a comprises an operating member 60, a fixing plate 65, and an adjustment assembly 62. When the operating member 60 is operated, the operating member 60 drives the adjustment assembly 62 to adjust the current of the hub motor 33, thereby controlling the speed and / or direction of the hub motor 33. Specifically, the operating member 60 is connected to the armrest assembly 5 via a fixing plate 65. The fixing plate 65 is fixedly connected to the armrest assembly 5, and the operating member 60 is rotatable relative to the fixing plate 65. The operating member 60 is formed with a housing 602, and the adjustment assembly 62 is disposed within the housing 602. The operating member 60 also has an operating portion 601 for manual manipulation by the operator. The operating portion 601 is connected to the housing 602. When the operator manipulates the operating portion 601, the operating portion 601 drives the housing 602 to move. In this embodiment, the operating portion 601 is in the shape of a long handle, one end of which is connected to the housing 602 , and preferably, the operating portion 601 and the housing 602 are integrally provided.

[0043] A limiting column 603 is provided on the housing 602 , and an arc-shaped hole 651 is formed on the fixing plate 65 . The arc-shaped hole 651 is used to cooperate with the corresponding limiting column 603 formed on the housing 602 , thereby limiting the rotation angle range of the operating member 60 .

[0044] The adjustment assembly 62 is connected to the control circuit board 30 and is used to adjust the magnitude and direction of the current flowing through the hub motor 33, thereby controlling the speed and direction of the hub motor 33. In one embodiment of the present invention, the adjustment assembly 62 includes a resistor coil 621 and a slider 622. The slider 622 is capable of sliding relative to the resistor coil 621. Specifically, the resistor coil 621 is connected to the fixing plate 65, and the slider 622 is connected to the housing 602 and moves synchronously with the housing 602. The housing 602 is formed with a first accommodating cavity 6021 and a second accommodating cavity 6022 connected to the first accommodating cavity 6021. The resistor coil 621 of the adjustment assembly 62 is housed in the first accommodating cavity 6021, and the slider 622 is housed in the second accommodating cavity 6022. After the adjustment assembly 62 is installed in the housing 602, one end of the slider 622 contacts the resistor coil 621, adjusting the effective resistance value of the circuit connected to the resistor coil 621. The combination of the resistor coil 621 and the slider 622 now forms a variable resistor.

[0045] See also Figure 9As shown, one end of the resistor coil 621 and the end of the slider 622 away from the resistor coil 621 are preferably connected to a wire 69. This wire 69 extends from the interior of the housing 602. The resistor coil 621 and the slider 622 are connected to the control circuit board 30 via this wire 69, thereby integrating the adjustment component 62 into the overall circuit and adjusting the current flowing through the hub motor 33. Since this circuit connection method is well known to those skilled in the art, it will not be described in detail here. Of course, in other embodiments, the resistor coil 621 and the slider 622 can also be connected to the control circuit board 30 through other means, such as contact pins, end pins, etc.

[0046] Please refer again Figure 5 and Figure 6 As shown, since the resistance coil 621 is connected to the fixed plate 65, when the operating member 60 rotates, the resistance coil 621 does not move, that is, the housing 602 of the operating member 60 rotates relative to the resistance coil 621. Since the slider 622 is connected to the housing 602, when the operating member 60 rotates, the slider 622 moves together with the operating member 60, that is, relative rotation occurs between the slider 622 and the resistance coil 621. Then, the effective part of the resistance coil 621 connected to the entire circuit is adjusted, and the control circuit board 30 can control the speed of the corresponding hub motor 33.

[0047] In an embodiment of the present invention, the operating member 60 is provided with an initial position "0" point position. At this position, the effective resistance value of the adjustment component 62 connected to the circuit is 0 or infinitely close to zero. When operating the snowplow 100, first press the self-propelled pressure handle, and the control circuit board 30 controls the two hub motors 33 to start moving. At this time, since the left steering control device 6a and the right steering control device 6b are both in the initial position, that is, the "0" point position, the left hub motor 33 and the right hub motor 33' have the same rotational speed, and the snowplow 100 moves forward normally.

[0048] If it is necessary to turn left during walking, operate the left steering control device 6a on the left handle 52a, specifically, press the operating part 601 of the operating member 60. At this time, the operating part 601 rotates relative to the fixed plate 65, and drives the slider 622 to rotate. The slider 622 moves relative to the resistor coil 621, so that the effective resistance value of the resistor coil 621 connected to the entire circuit increases, then the current flowing through the left hub motor 33 is reduced, and the speed of the left hub motor 33 is reduced. Moreover, as the rotation stroke of the operating member 60 gradually increases, the speed of the left hub motor 33 gradually decreases. Since the speed of the right hub motor 33' remains unchanged, the snowplow 100 can turn left.

[0049] It should be noted that when the effective resistance value of the resistor coil 621 connected to the entire circuit is sufficiently large, the speed of the corresponding wheel hub motor 33 can be reduced to zero. After the turn is completed, the operating member 60 can be returned to the "0" position, and the snowplow 100 will resume normal operation. Similarly, when the snowplow 100 needs to turn right, the right steering control device 6b on the right handlebar 52b is operated, and the speed of the right wheel hub motor 33' is reduced, even to zero, and the snowplow 100 can turn right.

[0050] Furthermore, the operating member 60 of the present invention is also provided with a "P" point position. When the slider 622 moves to the "P" point position, the control circuit board 30 adjusts the direction of the current of the entire circuit, that is, adjusts the direction of the current flowing through the corresponding hub motor 33, thereby controlling the hub motor 33 to adjust the rotation direction.

[0051] Specifically, in this embodiment, the operating member 60 is further provided with a position sensor (not shown) at the "P" position. This position sensor is connected to the control circuit board 30. When the slider 622 moves to this position, the position sensor detects this information and transmits it to the control circuit board 30. Upon receiving the signal, the control circuit board 30 adjusts the current flow of the entire circuit, causing the current in the entire circuit to reverse. At this time, the wheel hub motor 33 begins to rotate in the opposite direction. Moreover, after the slider 622 passes the "P" position, the reverse speed of the corresponding wheel hub motor 33 gradually increases as the slider 622 moves. The "P" position of the operating member 60 of the present invention can reverse the corresponding wheel hub motor 33, thereby enabling the snowplow 100 to achieve zero steering (i.e., zero turning radius), greatly facilitating the snowplow 100's steering in confined spaces. Of course, in other embodiments of the present invention, other sensors, such as a light sensor, or other components capable of detecting the movement of the slider 622, can also be provided at the "P" position, and this is not intended to be limiting.

[0052] The operating member 60 of the present invention is also provided with an "R" point position, at which the effective resistance value of the adjustment component 62 connected to the circuit is also 0 or infinitely close to zero, corresponding to the reverse rotation speed of the hub motor 33 reaching the maximum.

[0053] When the snowplow 100 needs to turn left in a confined space, the operating member 60 of the left steering control device 6a is pressed. The left wheel hub motor 33 first gradually decelerates. When the slider 622 moves to the "P" position, the left wheel hub motor 33 begins to reverse. Continued pressing of the operating member 60 gradually increases the reverse speed of the left wheel hub motor 33, while the right wheel hub motor 33' rotates normally. This achieves a zero-turn left turn, or zero turn. After the turn is complete, the operating member 60 is returned to the "0" position. A similar process occurs when the snowplow 100 needs to turn right in a confined space.

[0054] The following is an explanation based on the specific circuit. Figure 10 As shown, the two ends of the resistance coil 621 are defined as point A and point B respectively, and the slider 622 is defined as point C. Point A and point B are both connected to a wire 69, and point A and point B are both connected to the control circuit board 30 through the wire 69. In addition, a switch S1 is provided between point A and the control circuit board 30, a switch S2 is provided between point B and the control circuit board 30, and point C is also connected to the control circuit board 30 through the wire 69. When the slider 622 is located between the "0" point position and the "P" point position, the switch S1 is closed and the switch S2 is opened. Then, points A and C are connected to the entire circuit, that is, the point A end of the resistance coil 621 and the slider 622 are connected to the circuit. At this time, as the slider 622 approaches the "P" point position, the resistance coil 621 is connected to the effective The resistance value gradually increases, and thus the corresponding rotation speed of the hub motor 33 gradually decreases; when the slider reaches the "P" point position, the position sensor detects a signal, causing the control circuit board 30 to control the current in the entire circuit to reverse, causing the hub motor 33 to reverse; when the slider 622 is between the "P" point position and the "R" point position, the switch S1 is opened and the switch S2 is closed, then, points B and C are connected to the entire circuit, that is, the point B end of the resistor coil 621 and the slider 622 are connected to the circuit. At this time, as the slider 622 approaches the "R" point position, the effective resistance value of the resistor coil 621 connected to the entire circuit gradually decreases, and thus the corresponding rotation speed of the hub motor 33 gradually increases, thereby achieving a gradual increase in the reverse rotation speed of the hub motor 33. Of course, in other embodiments of the present invention, other forms of circuits can also be used for control, and this should not be limited to this.

[0055] It should be noted that in the prior art, there are many ways to use the control circuit board 30 to adjust the current direction of the entire circuit. The present invention can directly use the existing method to adjust the current direction of the entire circuit, and the specific adjustment method will not be described again.

[0056] Please refer again Figures 5 to 8As shown, as a preferred embodiment, the above-mentioned resistor coil 621 is provided with at least one protruding end 6211, and the resistor coil 621 is connected to the fixing plate 65 at the protruding end 6211 by a screw. At the same time, the first accommodating cavity 6021 of the housing 602 is provided with an avoidance portion 6023 that cooperates with the resistor coil 621 to avoid the protruding end 6211 of the resistor coil 621, so as to prevent the housing 602 of the operating member 60 from interfering with the protruding end 6211 of the resistor coil 621 during rotation.

[0057] The steering control device 6 further includes an end cap 61, which is disposed on the side of the operating member 60 facing away from the fixed plate 65. The operating member 60 is clamped between the end cap 61 and the fixed plate 65. Specifically, the end cap 61, the operating member 60, and the fixed plate 65 are connected together by a locking member 66. In this embodiment, the locking member 66 preferably includes a positioning bolt 67 and a locking nut 68. The positioning bolt 67 sequentially passes through the end cap 61, the housing 602, and the fixed plate 65, and engages with the locking nut 68 on one side of the fixed plate 65, thereby connecting the above components together. In the present invention, a plurality of first latching teeth 611 are provided on the side of the end cap 61 facing the operating member 60. Simultaneously, a second latching tooth 604 is provided on the side of the housing 602 facing the end cap 61, which cooperates with the first latching teeth 611. The cooperation between the first latching teeth 611 and the second latching teeth 604 can produce a step-by-step jerking sensation when the operating member 60 rotates, thereby preventing the operating member 60 from rotating rapidly. This arrangement of the present invention makes it easier for the operator to control the operating member 60, thereby improving the controllability of the operating member 60. Of course, in other embodiments of the present invention, the first latching teeth 611 and the second latching teeth 604 can also be protrusions or similar structures, as long as the same effect can be achieved, and this is not a limitation here.

[0058] It should be noted that in this embodiment, the first latching tooth 611 and / or the second latching tooth 604 are more prominent at point "P," i.e., the latching teeth at point "P" are higher than those at other positions. This arrangement creates a distinct latching point for the operating member 60 at point "P," allowing the operator to quickly identify the position of the operating member 60. Furthermore, to clearly indicate the aforementioned positions, the end cap 61 of this embodiment is further provided with corresponding markings, 0, P, and R, for easier identification by the operator.

[0059] In order to prevent the end cover 61 from rotating together with the operating member 60, a rotation-stopping portion is further provided between the end cover 61 and the locking member 66 of the present invention. The rotation-stopping portion can limit the end cover 61 and prevent the end cover 61 from rotating, thereby allowing the first latch 611 to function stably. In this embodiment, the rotation-stopping portion includes a positioning block 671 provided on the positioning bolt 67 and a positioning hole 610 provided on the end cover 61. Preferably, the positioning block 671 and the positioning hole 610 are both rectangular. When the rectangular positioning block 671 and the positioning hole 610 cooperate, the end cover 61 can be prevented from rotating under the drive of the operating member 60. Of course, in other embodiments of the present invention, the positioning block 671 and the positioning hole 610 can also be other polygonal shapes or other special structures, as long as they can prevent rotation.

[0060] Reference Figure 5 and Figure 6 As shown, the steering control device 6 of the present invention is further provided with a pressing member 64, which is held between the shell 602 and the fixed plate 65. Specifically, one end of the pressing member 64 contacts the shell 602, and the other end contacts the fixed plate 65. The pressing member 64 allows the shell 602 to always maintain a trend away from the fixed plate 65, and can always press the shell 602 toward the end cover 61, so that the shell 602 and the end cover 61 are in closer contact, so that the first latch tooth 611 and the second latch tooth 604 can function more stably.

[0061] Furthermore, the steering control device 6 of the present invention is further provided with a return element 63. This return element 63 is housed within the housing 602 of the operating member 60 and is used to drive the housing 602 to reset. In this embodiment, the return element 63 is a return spring. When the operator removes the external force acting on the operating portion 601, the operating member 60 returns to its initial position under the action of the return element 63. In this embodiment, after the external force is removed, the return element 63 drives the operating member 60 back to the "0" position, at which point the snowplow 100 stops steering. Preferably, the return element 63 of this embodiment is mounted on the positioning bolt 67 and is pressed into the housing 602 by the resistor coil 621.

[0062] In addition, gaskets 70 may be added between the above-mentioned components to provide buffering functions, pressure-bearing functions, etc. between different components. The specific details are not repeated here.

[0063] To sum up, the snow sweeper 100 of the present invention is equipped with a steering control device 6 on the armrest assembly 5, so that the steering control device 6 can be used to adjust the current of the hub motor 33, and then control the rotation speed of the walking wheel 32, and then the differential speed of the left and right walking wheels 32 can be used to form steering or zero steering. The overall structure is simple and easy for users to operate.

[0064] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. 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 may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A hand-push electric tool, characterized in that: include: frame; A working component is installed on the frame; A self-propelled system is mounted on the frame and includes at least two hub motors and travel wheels controlled by the hub motors; a power system, the power system providing power to the working assembly and the self-propelled system; an armrest assembly, mounted on the frame and provided for an operator to hold; as well as A steering control device is mounted on the armrest assembly and electrically connected to the self-propelled system. The steering control device includes an operating member and an adjustment assembly. When the operating member is operated, the operating member drives the adjustment assembly to adjust the current of the hub motor to control the speed and / or direction of the hub motor. The adjustment assembly includes a resistance coil and a slider. One end of the slider contacts the resistance coil and the slider is capable of sliding relative to the resistance coil. The resistor ring and the slider are combined to form a variable resistor, and the slider can slide between three positions, including: the 0 point position, the initial position where the hub motor speed does not change; the P point position, the position where the hub motor is controlled to reverse; and the R point position, the position where the reverse speed of the hub motor is controlled to reach the maximum. The steering control device also includes a position sensor, which is connected to the control circuit board in the self-propelled system. When the slider slides to point P, the position sensor transmits the detected position information of the slider to the control circuit board, so that the control circuit board controls the hub motor to start reverse rotation.

2. The hand-push power tool according to claim 1, characterized in that: The steering control device also includes a fixing plate, which is connected to the armrest assembly. The operating member is rotatably connected to the fixing plate. The operating member includes an operating part and a shell, which is connected to the operating part. The adjustment assembly is accommodated in the shell.

3. The hand-push power tool according to claim 2, wherein: The resistance coil is connected to the fixing plate, and the slider is connected to the housing.

4. The hand-push power tool according to claim 2, wherein: The steering control device also includes an end cover, which is located on the side of the operating member facing away from the fixed plate. The end cover, the operating member and the fixed plate are connected together by a locking member. A first latch tooth is provided on the end cover, and a second latch tooth that cooperates with the first latch tooth is provided on the side of the operating member facing the end cover.

5. The hand-push electric tool according to claim 2, wherein: The steering control device further includes a pressing member and a return element. The pressing member is held between the housing and the fixing plate. The return element is accommodated in the housing to drive the operating member to return to its original position.

6. The hand-push electric tool according to claim 2, wherein: The housing is provided with a limiting column, and the fixing plate is formed with an arc-shaped hole, which is used to cooperate with a corresponding limiting column formed on the housing to limit the rotation angle range of the operating member.

7. The hand-propelled electric tool according to claim 1, wherein: The armrest assembly includes a pair of handlebars, and the steering control device includes a left steering control device and a right steering control device respectively mounted on the pair of handlebars.

8. The hand-push electric tool according to claim 1, wherein: The hand-push electric tool is a snow blower.

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