An electric tool and an automatic alignment method for a keyhole and a locking pin

Abstract

The present application provides a power tool and a method for automatically aligning a keyhole and a locking pin. By providing a positioning component on the output shaft for positioning the positional relationship between the keyhole and the locking pin and forming a signal of the positional relationship, and sending the signal to a controller, the controller adjusts the positional relationship between the keyhole and the locking pin based on the signal, so that the automatic alignment of the keyhole and the locking pin can be achieved. Thus, when replacing the tool of the power tool, the locking pin can be directly pressed into the keyhole without first manually rotating the keyhole on the output shaft to align with the locking pin, which not only saves the process of replacing the tool, but also improves safety. Further, when the positional relationship between the keyhole and the locking pin does not meet the preset conditions, the controller adjusts the positional relationship between the keyhole and the locking pin to meet the preset conditions, so that when the power tool stops working (i.e., when the output shaft stops rotating), the keyhole can be aligned with the locking pin, and the alignment accuracy is high.

Description

Technical Field

[0001] The present invention relates to the technical field of power tools, and particularly relates to a power tool and an automatic alignment method for a lock hole and a lock pin. Background Art

[0002] At present, the application of power tools has been very popular. Since the cutting tool will have a certain amount of wear during the working process, the cutting tool needs to be replaced within a certain period of time. For current AC and DC power tools, when replacing the cutting tool, it is usually necessary to manually align the lock hole and the lock pin on the output shaft of the machine first, and then the lock pin can be inserted into the lock hole. After locking the output shaft, the cutting tool can be disassembled and assembled. This operation method requires one hand to rotate the output shaft and the other hand to press the lock pin, which is not very convenient to operate. Moreover, it is possible that the output shaft needs to be rotated one full circle to insert the lock pin into the lock hole, and the lock pin is easily worn. Such an operation is rather cumbersome, and since the tool is equipped with a cutting tool, sometimes fingers may be accidentally injured if the position is manually adjusted improperly. This greatly affects the operation experience of the user. Summary of the Invention

[0003] The purpose of the present invention is to provide a power tool to solve the technical problem that the lock pin and the pin hole of the existing power tool need to be manually aligned when disassembling and assembling the cutting tool.

[0004] To achieve the above purpose, the present application provides a power tool, which includes a housing, a motor, a controller, and an output shaft; the motor, the controller, and the output shaft are all arranged in the housing; the controller is connected to the motor to control the movement or stop of the motor; the motor is connected to the output shaft to drive the output shaft to rotate and reciprocate around its own axis; and the output shaft is used to install and drive the working head to work; a lock pin is provided at one end of the housing, and a lock hole is provided at one end of the output shaft close to the lock pin, wherein the lock hole penetrates the output shaft along the radial direction of the output shaft, and the power tool further includes a positioning component, which is connected to the output shaft and is used to position the positional relationship between the lock hole and the lock pin and form a signal of the positional relationship; the controller is connected to the positioning component, receives the signal of the positional relationship between the lock hole and the lock pin, and adjusts the positional relationship between the lock hole and the lock pin based on the signal;

[0005] Wherein, the power tool is configured such that when the positional relationship between the lock hole and the lock pin does not meet the preset condition, the controller adjusts the positional relationship between the lock hole and the lock pin to meet the preset condition based on the signal.

[0006] Optionally, in the power tool, the preset condition is that the projection of the lock pin along the radial direction of the output shaft is located within the projection of the lock hole along the radial direction of the output shaft.

[0007] Optionally, in the electric tool, the positioning assembly includes a grating encoder, a detector, and a light source. The grating encoder is fixed to one end of the output shaft away from the lock hole, and the detector and the light source are arranged on the inner wall of the housing. The grating encoder is provided with a plurality of gratings and position marks, and the position marks are used to calibrate the position of the lock pin. The detector is connected to the grating encoder for detecting the position where the mark is located and forming the signal. The detector is connected to the controller, and the detector sends the signal to the controller.

[0008] Optionally, in the electric tool, an installation hole is provided in the middle of the grating encoder, an internal thread is provided in the installation hole, and an external thread connected to the internal thread is provided at one end of the output shaft away from the lock hole.

[0009] Optionally, in the electric tool, a boss is provided at one end of the output shaft away from the lock hole, an installation hole is provided in the middle of the grating encoder, and a groove is provided in the installation hole, and the groove is snap-connected with the boss.

[0010] Optionally, in the electric tool, the positioning assembly is a position sensor, and the position sensor is fixedly connected to the output shaft to sense the positional relationship between the lock hole and the lock pin. The position sensor is connected to the controller and sends the positional relationship between the lock hole and the lock pin to the controller.

[0011] Optionally, in the electric tool, the positioning assembly is a position sensor, and the position sensor is arranged on the motor to sense the positional relationship between the lock hole and the lock pin. The position sensor is connected to the controller and sends the positional relationship between the lock hole and the lock pin to the controller.

[0012] Optionally, in the electric tool, the electric tool is a trimming machine, a angle grinder, or a multi-functional shovel.

[0013] On the other hand, the present application also provides a method for automatically aligning a lock hole and a lock pin, including the following steps:

[0014] Provide the above-mentioned electric tool;

[0015] Obtain the positional relationship between the lock hole and the lock pin and form a positional relationship signal;

[0016] Receive and analyze the positional relationship signal;

[0017] Judge whether the positional relationship meets a preset condition. If so, the automatic alignment of the lock hole and the lock pin is completed. If not, adjust the positional relationship between the lock hole and the lock pin.

[0018] Optionally, in the method for automatically aligning the keyhole and the locking pin, the step of determining whether the positional relationship satisfies a preset condition includes:

[0019] Determine whether the projection of the locking pin along the radial direction of the output shaft is completely located within the projection of the keyhole along the radial direction of the output shaft. If so, the positional relationship satisfies the preset condition; if not, the positional relationship does not satisfy the preset condition.

[0020] Compared with the prior art, the present application provides a power tool. By providing a positioning component on the output shaft, the positioning component is used to position the positional relationship between the keyhole and the locking pin and form a signal of the positional relationship; the controller is connected to the positioning component, receives the signal of the positional relationship between the keyhole and the locking pin, and adjusts the positional relationship between the keyhole and the locking pin based on the signal, so that the keyhole and the locking pin can be automatically aligned. Thus, when replacing the tool of the power tool, it is not necessary to manually rotate the keyhole on the output shaft to align with the locking pin first, and the locking pin can be directly pressed into the keyhole, which not only saves the process of replacing the tool but also improves safety. Further, the power tool is configured such that when the positional relationship between the keyhole and the locking pin does not meet the preset condition, the controller adjusts the positional relationship between the keyhole and the locking pin to meet the preset condition based on the signal. In this way, when the power tool stops working (i.e., when the output shaft stops rotating), the keyhole can be aligned with the locking pin, and the alignment accuracy is high. Description of the Drawings

[0021] Figure 1 is a schematic structural diagram of a power tool provided by an embodiment of the present application;

[0022] Figure 2 is a cross-sectional view of a power tool provided by an embodiment of the present application;

[0023] Figure 3 is a schematic internal structural diagram of a power tool provided by an embodiment of the present application;

[0024] Figure 4 is a flowchart of a method for automatically aligning a keyhole and a locking pin provided by an embodiment of the present application.

[0025] Among them, the Figures 1 to 3 reference numerals in the drawings are described as follows:

[0026] 10 - housing; 11 - locking pin; 20 - output shaft; 21 - keyhole; 22 - boss; 30 - motor; 40 - controller; 50 - positioning component; 51 - grating encoder; 511 - grating; 512 - mounting hole; 513 - groove; 52 - detector; 60 - electric wire. Detailed implementation manners

[0027] To make the objectives, advantages and features of the present invention clearer, the following further describes in detail the power tool and the method for automatically aligning a keyhole and a locking pin proposed by the present invention in conjunction with the accompanying Figures 1 to 4 drawings. It should be noted that the accompanying drawings are all in a very simplified form and use non-precise scales, and are only used to conveniently and clearly assist in explaining the objectives of the embodiments of the present invention.

[0028] As used in this specification, the singular forms "a", "an" and "the" include plural objects, and the plural form "a plurality of" includes more than two objects, unless the content clearly indicates otherwise. As used in this specification, the term "or" is generally used in the sense of including "and / or", unless the content clearly indicates otherwise, and the terms "mounted", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can also be an electrical connection and a communication connection. It can be directly connected or indirectly connected through an intermediate medium. It can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

[0029] Refer to Figures 1 - 3 , which are respectively a schematic structural diagram, a cross-sectional view and a schematic internal structure diagram of the power tool provided by the embodiment of the present application. The present application provides a power tool, which includes a housing 10, a motor 30, a controller 40 and an output shaft 20; the motor 30, the controller 40 and the output shaft 20 are all arranged in the housing 10; the controller 40 is connected to the motor 30 to control the movement or stop of the motor 30; the motor 30 is connected to the output shaft 20 to drive the output shaft 20 to rotate and reciprocate around its own axis; and the output shaft 20 is used to mount and drive a working head to work; a locking pin 11 is provided at one end of the housing 10, and a keyhole 21 is provided at one end of the output shaft 20 close to the locking pin 11, wherein the keyhole 21 penetrates the output shaft 20 along the radial direction of the output shaft 20; the power tool further includes a positioning assembly 50, the positioning assembly 50 is connected to the output shaft 20, and is used to position the positional relationship between the keyhole 21 and the locking pin 11 and form a signal of the positional relationship; the controller 40 is connected to the positioning assembly 50, receives the signal of the positional relationship between the keyhole 21 and the locking pin 11, and adjusts the positional relationship between the keyhole 21 and the locking pin 11 based on the signal.

[0030] Among them, the power tool is configured such that when the positional relationship between the keyhole 21 and the locking pin 11 does not meet the preset condition, the controller 40 adjusts the positional relationship between the keyhole 21 and the locking pin 11 to meet the preset condition based on the signal. In this way, when the power tool stops working (i.e., when the output shaft 20 stops rotating), the keyhole 21 can be aligned with the locking pin 11 with high alignment accuracy. That is, the locking pin 11 can be pressed into the keyhole 21 to complete the locking of the output shaft 20. There is no need for manual adjustment of the keyhole 21 to the position where it aligns with the locking pin 11.

[0031] Among them, since the keyhole 21 penetrates the output shaft 20 along the radial direction of the output shaft 20, preferably, two position marks can be provided, and the two position marks are axisymmetric about the output shaft 20.

[0032] By providing a positioning assembly 50 on the output shaft 20, the positioning assembly 50 is used to position the positional relationship between the keyhole 21 and the locking pin 11 and form a signal of the positional relationship; the controller 40 is connected to the positioning assembly 50, receives the signal of the positional relationship between the keyhole 21 and the locking pin 11, and adjusts the positional relationship between the keyhole 21 and the locking pin 11 based on the signal. In this way, automatic alignment of the keyhole 21 and the locking pin 11 can be achieved, so that when replacing the tool of the power tool, there is no need to first manually rotate the keyhole 21 on the output shaft 20 to align with the locking pin 11, and the locking pin 11 can be directly pressed into the keyhole 21. This not only saves the process of replacing the tool but also improves safety. Further, when the positional relationship between the keyhole 21 and the locking pin 11 does not meet the preset condition, the controller 40 adjusts the positional relationship between the keyhole 21 and the locking pin 11 to meet the preset condition based on the signal. In this way, when the output shaft 20 stops rotating, the keyhole 21 can be aligned with the locking pin 11 with high alignment accuracy.

[0033] The preset condition is that the projection of the locking pin 11 along the radial direction of the output shaft 20 is located within the projection of the locking hole 21 along the radial direction of the output shaft 20. That is, when the power tool finishes working, if the projection of the locking pin 11 along the radial direction of the output shaft 20 is located within the projection of the locking hole 21 along the radial direction of the output shaft 20, then the output shaft 20 stops rotating. If the projection of the locking pin 11 along the radial direction of the output shaft 20 is not completely located within the projection of the locking hole 21 along the radial direction of the output shaft 20, then the controller 40 controls the motor 30 to drive the output shaft 20 to rotate so as to adjust the projection of the locking pin 11 along the radial direction of the output shaft 20 to be completely located within the projection of the locking hole 21 along the radial direction of the output shaft 20. Of course, it can be taken as a preferred preset condition that the axis of the locking hole 21 and the axis of the locking pin 11 are on the same straight line. The preset condition should be understood as long as the locking pin 11 can be directly and smoothly inserted into the locking hole 21.

[0034] Refer to with emphasis Figure 3 , wherein, the positioning assembly 50 includes a grating encoder 51, a detector 52 and a light source (not shown in the figure). The grating encoder 51 is fixed on the end of the output shaft 20 far from the locking hole 21, and the detector 52 and the light source are arranged on the inner wall of the housing 10. The grating encoder 51 is provided with a plurality of gratings 511 and position marks (not shown in the figure), and the position marks are used to calibrate the position of the locking pin 11. Among them, the detector 52 is connected to the grating encoder 51. Specifically, the detector 52 is connected to the controller 40 through a wire 60, and is used to detect the position where the mark is located and form the signal. The detector 52 is connected to the controller 40, and the detector 52 sends the signal to the controller 40. The light source provides a workable environment for the grating encoder 51. Preferably, the light source is a light-emitting diode, which can provide strong light to pass through the grating 511.

[0035] The grating encoder 51 is fixedly connected to the output shaft 20. Specifically, an installation hole 512 is provided in the middle of the grating encoder 51, and an internal thread (not shown in the figure) is provided in the installation hole 512. An external thread (not shown in the figure) connected to the internal thread is provided at one end of the output shaft 20 away from the lock hole 21. In this way, it can be ensured that there is no relative displacement between the grating encoder 51 and the output shaft 20, and thus the relative position between the position mark and the lock hole 21 can be ensured to remain unchanged. Also, since the position mark marks the position of the lock pin 11, as long as the position mark is detected at a predetermined position, the positional relationship between the lock hole 21 and the lock pin 11 meets the preset conditions. When the position mark is not at the predetermined position, the positional relationship between the lock hole 21 and the lock pin 11 does not meet the preset conditions. At this time, the controller 40 controls the motor 30 to drive the output shaft 20 to rotate so as to rotate the position mark to the preset position to achieve the automatic alignment of the lock pin 11 and the lock hole 21.

[0036] In another embodiment, a boss 22 is provided at one end of the output shaft 20 away from the lock hole 21. An installation hole 512 is provided in the middle of the grating encoder 51, and a groove 513 is provided in the installation hole 512. The groove 513 is snap-fitted with the boss 22. The grating encoder 51 is sleeved on the output shaft 20, and the boss 22 is pressed into the groove 513. The boss 22 and the groove 513 are in interference fit to ensure the firmness of the fixed connection between the grating encoder 51 and the output shaft 20. Preferably, in order to further improve the firmness of the fixed connection between the grating encoder 51 and the output shaft 20, both the groove 513 and the boss 22 can be multiple. One boss 22 is pressed into one groove 513, so that the connection between the grating encoder 51 and the output shaft 20 can be made more firm.

[0037] The positioning assembly 50 is a position sensor (not shown in the figure). The position sensor is fixedly connected to the output shaft 20, that is, the relative position between the position sensor and the lock hole 21 is fixed. The position sensor is connected to the controller 40 and sends the positional relationship between the lock hole 21 and the lock pin 11 to the controller 40. In this way, the position sensor only needs to sense the positional relationship between the lock pin 11 and itself, so that the controller 40 can combine the positional relationship between the position sensor and the lock hole 21 to judge whether the positional relationship between the lock pin 11 and the lock hole 21 meets the preset conditions.

[0038] Of course, since the motor 30 and the output shaft 20 are fixedly connected, when the power tool is assembled, the relative positional relationship between the lock hole 21 and the motor 30 is fixed. Then, the position sensor can also be arranged on the motor 30, and the position sensor is connected to the controller 40. When the position of the position sensor on the motor 30 is fixed, that is, its positional relationship with the lock hole 21 is also fixed. At this time, only the positional relationship between the lock pin 11 and itself needs to be sensed, so as to determine the positional relationship between the lock hole 21 and the lock pin 11, and send the positional relationship between the lock hole 21 and the lock pin 11 to the controller 40. Thus, the controller 40 can combine the positional relationship between the position sensor and the lock hole 21 to judge whether the positional relationship between the lock pin 11 and the lock hole 21 meets the preset conditions.

[0039] Wherein, the power tool is a trimming machine, a angle grinder or a multi-functional shovel.

[0040] Refer to Figure 4 , and in combination with Figures 1 - 3 . On the other hand, the present application also provides a method for automatically aligning the lock hole 21 and the lock pin 11, including the following steps:

[0041] Step S10: Provide the above-mentioned power tool.

[0042] Step S20: Obtain the positional relationship between the lock hole 21 and the lock pin 11, and form a positional relationship signal; specifically, the positional relationship between the lock hole 21 and the lock pin 11 can be obtained directly or indirectly. For example: the position where the position mark of the grating encoder 51 is located is in the same vertical plane as the axis of the lock hole 21, or the position where the position sensor is located is inside the lock hole 21 or directly below the opening of the lock hole 21, so that the detector 52 can directly obtain the positional relationship between the lock hole 21 and the lock pin 11. On the contrary, the position sensor or the detector 52 needs to first obtain the positional relationship between the lock pin 11 and itself, and then combine its positional relationship with the lock hole 21 to obtain the positional relationship between the lock hole 21 and the lock pin 11.

[0043] Step S30: Receive and analyze the positional relationship signal.

[0044] Step S40: Judge whether the positional relationship meets the preset conditions. If so, the automatic alignment of the lock hole 21 and the lock pin 11 is completed. If not, adjust the positional relationship between the lock hole 21 and the lock pin 11.

[0045] Wherein, after adjusting the positional relationship between the lock hole 21 and the lock pin 11, the detector 52 or the position sensor re-obtains the new positional relationship between the lock hole 21 and the lock pin 11, and re-forms a positional relationship signal.

[0046] Among them, the steps of determining whether the position relationship meets the preset conditions include:

[0047] Determine whether the projection of the locking pin 11 along the radial direction of the output shaft 20 is completely located within the projection of the locking hole 21 along the radial direction of the output shaft 20. If so, the position relationship meets the preset conditions; if not, the position relationship does not meet the preset conditions.

[0048] In other embodiments, the steps of determining whether the position relationship meets the preset conditions include:

[0049] Determine whether the axis of the locking hole 21 and the axis of the locking pin 11 are on the same straight line. If so, the position relationship meets the preset conditions; if not, the position relationship does not meet the preset conditions.

[0050] Specifically, the positioning assembly 50 is a position sensor. The position sensor senses its position relationship with the locking pin 11, and combines its position relationship with the locking hole 21 to obtain the position relationship between the locking hole 21 and the locking pin 11, forms a position relationship signal, and sends the position relationship signal to the controller 40. The controller 40 determines whether the position relationship between the locking pin 11 and the locking hole 21 meets the preset conditions based on the position relationship signal. If so, the automatic alignment of the locking hole 21 and the locking pin 11 is completed; if not, the position relationship between the locking hole 21 and the locking pin 11 is adjusted. Adjusting the position relationship between the locking hole 21 and the locking pin 11 specifically means that the controller 40 controls the motor 30 to drive the output shaft 20 to rotate to adjust the position of the locking hole 21, so as to realize the adjustment of the position relationship between the locking hole 21 and the locking pin 11.

[0051] In another embodiment, the detector 52 detects the position of the position mark to obtain the position relationship between the position mark and the locking pin 11. And combines its position relationship with the locking hole 21 to obtain the position relationship between the locking hole 21 and the locking pin 11, forms a position relationship signal, and sends the position relationship signal to the controller 40. The controller 40 determines whether the position relationship between the locking pin 11 and the locking hole 21 meets the preset conditions based on the position relationship signal. If so, the automatic alignment of the locking hole 21 and the locking pin 11 is completed; if not, the position relationship between the locking hole 21 and the locking pin 11 is adjusted. Adjusting the position relationship between the locking hole 21 and the locking pin 11 specifically means that the controller 40 controls the motor 30 to drive the output shaft 20 to rotate to adjust the position of the locking hole 21, so as to realize the adjustment of the position relationship between the locking hole 21 and the locking pin 11.

[0052] The above description is only a description of the preferred embodiments of the present invention and does not limit the scope of the present invention in any way. Any changes and modifications made by those of ordinary skill in the art of the present invention based on the above disclosure fall within the scope of protection of the claims.

Claims

1. An electric tool, the electric tool comprising a housing, a motor, a controller and an output shaft; the motor, the controller and the output shaft are all arranged in the housing; the controller is connected to the motor to control the movement or stop of the motor; the motor is connected to the output shaft to drive the output shaft to rotate and reciprocate around its own axis; and the output shaft is used for mounting and driving a working head to work; a locking pin is provided at one end of the housing, and a locking hole is provided at one end of the output shaft close to the locking pin, wherein the locking hole penetrates through the output shaft along the radial direction of the output shaft, and is characterized in that, the electric tool further comprises a positioning assembly, the positioning assembly is connected to the output shaft, and is used for positioning the positional relationship between the locking hole and the locking pin and forming a signal of the positional relationship; the controller is connected to the positioning assembly, receives the signal of the positional relationship between the locking hole and the locking pin, and adjusts the positional relationship between the locking hole and the locking pin based on the signal; wherein, the electric tool is configured such that: when the positional relationship between the locking hole and the locking pin does not meet a preset condition, the controller adjusts the positional relationship between the locking hole and the locking pin to meet the preset condition based on the signal; the preset condition is that the projection of the locking pin along the radial direction of the output shaft is located within the projection of the locking hole along the radial direction of the output shaft; the positioning assembly comprises a grating encoder, a detector and a light source, the grating encoder is fixed at one end of the output shaft far from the locking hole, and the detector and the light source are arranged on the inner wall of the housing; a plurality of gratings and position marks are provided on the grating encoder, and the position marks are used for calibrating the position of the locking pin; the detector is connected to the grating encoder and is used for detecting the position where the mark is located and forming the signal, the detector is connected to the controller, and the detector sends the signal to the controller.

2. The electric tool according to claim 1, wherein, an installation hole is provided in the middle of the grating encoder, internal threads are provided in the installation hole, and external threads connected to the internal threads are provided at one end of the output shaft far from the locking hole.

3. The electric tool according to claim 1, wherein, a boss is provided at one end of the output shaft far from the locking hole, an installation hole is provided in the middle of the grating encoder, and a groove is provided in the installation hole, and the groove is clamped with the boss.

4. The electric tool according to claim 1, wherein, the positioning assembly is a position sensor, the position sensor is fixedly connected to the output shaft to sense the positional relationship between the locking hole and the locking pin, the position sensor is connected to the controller, and sends the positional relationship between the locking hole and the locking pin to the controller.

5. The electric tool according to claim 1, wherein, the positioning assembly is a position sensor, the position sensor is arranged on the motor to sense the positional relationship between the locking hole and the locking pin, the position sensor is connected to the controller, and sends the positional relationship between the locking hole and the locking pin to the controller.

6. The power tool according to claim 1, characterized in that the power tool is a trimming machine, a angle grinder or a multi-functional shovel.

7. An automatic alignment method for a keyhole and a lock pin Characterized in that it includes the following steps: providing a power tool according to any one of claims 1-6; obtaining the positional relationship between the keyhole and the locking pin and generating a positional relationship signal; receiving and analyzing the positional relationship signal; judging whether the positional relationship meets a preset condition. If so, the automatic alignment of the keyhole and the locking pin is completed. If not, adjusting the positional relationship between the keyhole and the locking pin.

8. The method for automatically aligning a keyhole and a locking pin according to claim 7, characterized in that the step of judging whether the positional relationship meets a preset condition includes: judging whether the projection of the locking pin along the radial direction of the output shaft is completely located within the projection of the keyhole along the radial direction of the output shaft. If so, the positional relationship meets the preset condition. If not, the positional relationship does not meet the preset condition.

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