Control method of electric tool

Abstract

The invention belongs to the technical field of electric tools, and particularly relates to a control method of an electric tool, comprising: a casing, one side of which is used for installing a tool head; the stroke assembly is arranged in the machine shell in a sliding mode, and the tool head is driven to work through sliding of the stroke assembly; the driving assembly is used for driving the stroke assembly to slide in the machine shell, and the driving assembly is provided with a control key for controlling the driving assembly to start and stop by pressing or loosening; the stroke assembly is provided with a stroke detection point; when the actual stroke of the stroke assembly is located in front of a stroke detection point, the stroke assembly slides at a high speed; when the actual stroke of the stroke assembly is located behind the stroke detection point, the stroke assembly slides at a low speed. High-speed sliding and low-speed sliding are carried out in sequence through the stroke detection points, on the premise that the stability of the stroke assembly and the stable work of the tool head are guaranteed, the single-time work time of the tool head is shortened, and the work efficiency is effectively improved.

Description

Technical Field

[0001] This patent belongs to the field of electric tool technology, and specifically refers to a control method for an electric tool. Background Art

[0002] Electric tools rely on motors to drive the tool heads to extrude or shear workpieces. The motors generally drive the hydraulic device to drive the piston, or directly drive the electric push rod to drive the tool heads.

[0003] Existing electric tools have the following defects:

[0004] 1. The piston or electric push rod has a certain working stroke, which causes the power tool to gradually wait for the piston or electric push rod to move to the desired position to work when in use, wasting time.

[0005] 2. During the use of power tools, it was found that due to the increase in frequency of use, the crimping mechanism was in a non-starting state, which would cause deviations in the extrusion distance and even cause collisions. Summary of the invention

[0006] The purpose of this patent is to provide a control method for an electric tool.

[0007] The purpose of this patent is achieved in this way:

[0008] A control method for an electric tool, comprising:

[0009] A housing, one side of which is used to mount a tool head;

[0010] A stroke component is slidably arranged in the housing, and the tool head is driven to work by sliding the stroke component;

[0011] A driving assembly, used for driving the travel assembly to slide in the housing, and the driving assembly is provided with a control button for controlling the start and stop of the driving assembly by pressing or releasing;

[0012] The stroke component has a stroke detection point;

[0013] When the actual stroke of the stroke component is before the stroke detection point, the stroke component slides at a high speed;

[0014] When the actual stroke of the stroke component is behind the stroke detection point, the stroke component slips at a low speed.

[0015] Furthermore, when the travel component slides at a high speed, the travel component is reset to an initial position by releasing the control button;

[0016] When the stroke assembly is sliding at a low speed, the stroke assembly is kept sliding at a low speed by releasing the control button until the driving of the hydraulic tool head is completed.

[0017] Furthermore, the driving component includes a brushless motor, and a back-electromotive force detection circuit for detecting the stroke component is provided in the brushless motor, and is used to detect the stroke of the brushless motor through the back-electromotive force detection circuit.

[0018] Furthermore, the brushless motor is provided with a current detection component for detecting current changes caused by the operation of the tool head;

[0019] When the current detection component detects that the current reaches the set working current or fails to detect that the current reaches the set working current for a long time, the driving component controls the stroke component to reset to the initial position of the stroke component.

[0020] Furthermore, an origin sensor is provided on the stroke component, and a detection element located on the sliding path of the stroke component is provided in the housing. When the detection element detects the origin sensor, the stroke component is located at its initial position.

[0021] Further, when the travel component is started,

[0022] If the sensing element cannot be detected, the driving component controls the stroke component to reset until the detection element can detect the origin sensing element;

[0023] If the sensing element can be detected, the driving component controls the stroke component to slide.

[0024] Furthermore, the induction component and the detection element include a magnet located on the stroke component and a Hall element located in the casing respectively.

[0025] Furthermore, it also includes a calibration component, which includes a read-write component that communicates with the drive component and a pressure sensor for detecting the actual pressure of the tool head. The calibration component is used to detect the actual pressure of the tool head working in a preset gear position through the pressure sensor, and feed back the actual pressure to the drive component through the read-write component.

[0026] Furthermore, the stroke assembly includes a lead screw driven by the driving assembly and a lead screw nut arranged on the lead screw, and the origin sensing component is arranged on the lead screw nut.

[0027] Compared with the prior art, the outstanding and beneficial technical effects of this patent are:

[0028] 1. This patent performs high-speed sliding and low-speed sliding in sequence through the stroke detection point. Under the premise of ensuring the stability of the stroke component and the stable operation of the tool head, it speeds up the single working time of the tool head and effectively increases the work efficiency.

[0029] 2. When the electric tool in this patent is started, the magnet and the Hall element will be used to detect whether the stroke component is in the initial position, so as to cooperate with the stroke detection point in the stroke component to accurately perform the speed change movement of the stroke component, so that each stroke component can be carried out stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural diagram of an electric tool.

[0031] Figure 2 It is the central control schematic diagram of the travel component.

[0032] The meaning of the symbols in the figure:

[0033] 1. Housing; 2. Tool head; 3. Stroke assembly; 31. Lead screw; 32. Lead screw nut; 4. Drive assembly; 41. Brushless motor; 42. Reducer; 5. Magnet; 6. Hall element; DETAILED DESCRIPTION

[0034] The present invention is further described below in conjunction with specific embodiments:

[0035] A control method for an electric tool, comprising a housing 1, a travel component 3, and a drive component 4, such as Figure 1 , 2 As shown, the driving component 4 in this patent includes a brushless motor 41, and the brushless motor 41 is connected to a reduction box 42, which is then connected to the stroke component 3 through the reduction box 42.

[0036] like Figure 1 As shown, the housing 1 is cylindrical in shape as a whole, and the stroke assembly 3 includes a lead screw 31 connected to the reduction box 42, and a lead screw nut 32 is provided on the lead screw 31. The brushless motor 41 drives the lead screw 31 to rotate through the reduction box 42. A limiting structure for limiting the rotation of the lead screw nut 32 is provided between the lead screw nut 32 and the housing 1, so that when the lead screw 31 rotates, the lead screw nut can slide along the lead screw 31. One side of the housing 1 is used to install a tool head 2, which is generally a crimping head or a shearing head, which has one end that abuts against the lead screw nut 32, and the lead screw nut 32 is driven to slide by the rotation of the lead screw 31, thereby pushing the crimping head or the shearing head to work.

[0037] Wherein, the stroke component 3 has a stroke detection point. When the actual stroke of the stroke component 3 is before the stroke detection point, the stroke component 3 slides at a high speed; when the actual stroke of the stroke component 3 is after the stroke detection point, the stroke component 3 slides at a low speed.

[0038] Specifically, the brushless motor 41 is still provided with an MCU, which controls the operation of the brushless motor 41 through circuits, and the MCU is connected to a control button located on the housing 1 through circuits. The control button is used to control the start and stop of the drive component 4 by pressing or releasing it, that is, when the user operates the control button, the MCU controls the brushless motor 41 to work.

[0039] The brushless motor 41 is a motor without brushes and commutator, and its commutation is controlled by a circuit. The brushless motor 41 is provided with a back-EMF detection circuit for detecting the stroke component 3, which is used to detect the stroke of the brushless motor 41 through a back-EMF sensor; in fact, the back-EMF detection circuit is connected to the MCU, and the back-EMF sensor can know the position of the motor rotor, that is, how much the brushless motor 41 has rotated, thereby inferring how many turns the lead screw has rotated, and then calculating how much distance the lead screw nut 32 has actually slipped; the stroke detection point is set in the MCU program, and by comparing the actual sliding distance of the lead screw nut 32 with the stroke detection point, the MCU makes a corresponding judgment, thereby controlling the brushless motor 41 to output a corresponding speed, thereby realizing high-speed operation of the stroke component 3.

[0040] Specifically, at the initial stage of the operation of the stroke component 3, the stroke component 3 is far away from the tool head 2, so it needs to run at high speed to quickly approach the tool head 2 to shorten the time required for the stroke component 3 to slide, thereby shortening the time required for a single operation of the power tool, thereby increasing work efficiency. After reaching the stroke detection point, the stroke component 3 runs slowly, which helps the stroke component 3 to be smoothly against the tool head 2, so that the tool head 2 can be smoothly controlled to work, increasing the safety and stability of the overall power tool use. Therefore, this patent performs high-speed sliding and low-speed sliding in sequence through the stroke detection point, and on the premise of ensuring the stability of the stroke component 3 and the stable operation of the tool head 2, speeds up the single working time of the tool head 2 and effectively increases work efficiency.

[0041] Furthermore, when the stroke component 3 slides at high speed, the stroke component 3 is reset to the initial position by releasing the control button; when the stroke component 3 slides at low speed, the stroke component 3 is kept sliding at low speed by releasing the control button until the hydraulic tool head 2 is driven. Under normal conditions, the user presses for a long time to continuously drive the stroke component 3 to slide to complete the work of the electric tool. In order to reduce the user's operating difficulty and operating fatigue, releasing the control button when the stroke component 3 slides at high speed indicates that the user has given up the current shearing, and the stroke component 3 should be reset to wait for the next movement. When the stroke component 3 slides at low speed, it means that the stroke component 3 is about to contact the tool head 2 and the electric tool is about to complete a work. Therefore, by setting a program in the MCU, the stroke component 3 is kept sliding at low speed until the hydraulic tool head 2 is driven, so as to reduce the operating difficulty of the electric tool of this patent.

[0042] In fact, the brushless motor 41 is provided with a current detection component for detecting the current change caused by the operation of the tool head 2; when the current detection component detects that the current reaches the set working current or the current has not been detected to reach the set working current for a long time, the driving component 4 controls the stroke component 3 to reset to the initial position of the stroke component 3. When the stroke component 3 is in contact with the tool head 2, there is a load on the stroke component 3, which increases the current of the brushless motor 41, and the current of the brushless motor 41 is proportional to the actual working pressure of the tool head 2, that is, when the tool head 2 reaches a certain output pressure under the drive of the stroke component 3, the current detection component will also detect a certain value of current. The current detection component is connected to the MCU, and the user will set the corresponding current rating in the MCU in advance to indicate the current rating reached by the tool head 2 after the work is completed, that is, when the actual current value of the current detection component is consistent with the preset current rating, the MCU controls the stroke component 3 to reset to the initial position of the stroke component 3, which means that one work is completed and waiting for the next start. A corresponding timer will also be set in the MCU. If the current is not detected to reach the set working current for a long time, it means that there is a problem with the operation of the tool head 2. For example, the tool head 2 is in contact with the object being processed and causes no load, or the tool head 2 is damaged and cannot contact the object being processed normally. The drive component 4 will also control the stroke component 3 to reset to the initial position of the stroke component 3, but the difference is that there will be an indicator light to remind the user that there is a fault, waiting for the user to solve the problem and wait for the next start.

[0043] Furthermore, the stroke component 3 is provided with an origin induction member, and the housing 1 is provided with a detection element located on the sliding path of the stroke component 3. When the detection element detects the origin induction member, the stroke component 3 is located at its initial position. Figure 1As shown, the induction component and the detection element include a magnet 5 located on the stroke component 3 and a Hall element 6 located in the housing 1 respectively.

[0044] When the electric tool is started, the magnet 5 and the Hall element 6 will be used to detect whether the stroke component 3 is in the initial position, so as to cooperate with the stroke detection point in the stroke component 3 to accurately perform the speed change movement of the stroke component 3, so that the stroke component 3 can be stably performed each time. Similarly, when the stroke component 3 completes a work or resets after failing to complete the work normally, it will slide in the reverse direction until the magnet 5 and the Hall element 6 detect each other, indicating that the stroke component 3 is in its initial position.

[0045] Furthermore, a calibration component is also included, which includes a reading and writing component that communicates with the driving component 4 and a pressure sensor for detecting the actual pressure of the tool head 2, and is used to detect the actual pressure of the tool head 2 working in the preset gear through the pressure sensor, and feed back the actual pressure to the driving component 4 through the reading and writing component. Among them, the reading and writing component generally communicates with the MCU in the driving component 4 through Bluetooth or infrared, and the pressure sensor is connected to the tool head 2. The calibration component generally reads the actual pressure detected by the pressure sensor first, and compares the actual pressure seen with the preset gear in the MCU through the reading and writing component to correct the preset pressure in the MCU to ensure that the actual pressure corresponds to the preset gear one by one.

[0046] The above embodiments are only preferred embodiments of this patent and are not intended to limit the protection scope of this patent. Therefore, any equivalent changes made based on the structure, shape, and principle of this patent should be covered within the protection scope of this patent.

[0047] It should be noted that the structures, proportions, sizes, etc. drawn in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the restrictive conditions for the implementation of this patent, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effect and purpose that can be achieved by this patent, should still fall within the scope of the technical content disclosed by this patent. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of this patent. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of this patent without substantial change in the technical content.

[0048] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or may be indirectly connected to the other element through an intermediate element.

[0049] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

Claims

1. A method for controlling an electric tool, characterized in that: include: A housing (1), one side of the housing (1) being used for mounting a tool head (2); A stroke component (3) is slidably arranged in the housing (1), and the tool head (2) is driven to work by sliding the stroke component (3); A driving component (4) is used to drive the travel component (3) to slide in the housing (1); the driving component (4) is provided with a control button that can be pressed or released to control the start and stop of the driving component (4); The stroke component (3) has a stroke detection point; When the actual stroke of the stroke component (3) is located before the stroke detection point, the stroke component (3) slides at a high speed; When the actual stroke of the stroke component (3) is located behind the stroke detection point, the stroke component (3) slips at a low speed.

2. The control method of an electric tool according to claim 1, characterized in that: When the travel component (3) slides at a high speed, the travel component (3) is reset to an initial position by releasing the control button; When the stroke component (3) is sliding at a low speed, the stroke component (3) is kept sliding at a low speed by releasing the control button until the driving of the hydraulic tool head (2) is completed.

3. A control method for an electric tool according to claim 1 or 2, characterized in that: The driving component (4) comprises a brushless motor (41), and a back-electromotive force detection circuit for detecting the stroke component (3) is provided in the brushless motor (41), and is used to detect the stroke of the brushless motor (41) through the back-electromotive force detection circuit.

4. The control method of an electric tool according to claim 3, characterized in that: The brushless motor (41) is provided with a current detection component for detecting current changes caused by the operation of the tool head (2); When the current detection component detects that the current has reached the set working current or has not detected that the current has reached the set working current for a long time, the drive component (4) controls the stroke component (3) to reset to the initial position of the stroke component (3).

5. The control method of an electric tool according to claim 3, characterized in that: The stroke component (3) is provided with an origin sensing component, and the housing (1) is provided with a detection element located on the sliding path of the stroke component (3); when the detection element detects the origin sensing component, the stroke component (3) is located at its initial position.

6. The control method of an electric tool according to claim 5, characterized in that: When the travel component (3) is activated, If the sensing element cannot be detected, the driving component (4) controls the stroke component (3) to reset until the detection element can detect the origin sensing element; If the sensing element can be detected, the driving component (4) controls the travel component (3) to slide.

7. The control method of an electric tool according to claim 5, characterized in that: The induction component and the detection element include a magnet (5) located on the stroke component (3) and a Hall element (6) located in the housing (1).

8. The control method of a power tool according to claim 3, characterized in that: The calibration component also includes a reading and writing component that communicates with the driving component (4) and a pressure sensor for detecting the actual pressure of the tool head (2), and is used to detect the actual pressure of the tool head (2) working in a preset gear position through the pressure sensor, and feed back the actual pressure to the driving component (4) through the reading and writing component.

9. The control method of an electric tool according to claim 5, characterized in that: The stroke assembly (3) comprises a lead screw (31) driven by the drive assembly (4) and a lead screw nut (32) arranged on the lead screw (31), and the origin sensing component is arranged on the lead screw nut (32).

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