Electric glue gun and control method thereof

Abstract

The invention discloses an electric glue gun and a control method thereof. The electric glue gun comprises a push-out mechanism used for installing a glue barrel and extruding glue; the motor is used for driving the push-out mechanism; the shell is used for supporting the push-out mechanism and is provided with a containing cavity for containing the motor and a handle for a user to hold; the operation switch is operated by a user to extrude the colloid according to the will of the user; the controller is used for controlling the motor to drive the push-out mechanism; wherein the controller is configured to control the motor to stop in a first position interval and to increase the speed after stepping out of the first position interval when the operation switch moves in the starting direction; when the operation switch moves in the turn-off direction, the motor is controlled to be decelerated before stepping into the second position interval and shut down in the second position interval; the second position point starting to stop in the second position interval is located on the rear side in the starting direction compared with the first position point ending to stop in the first position interval; the glue gun can be rapidly stopped, glue leakage is effectively avoided, and the user experience is improved.

Description

Technical Field

[0001] The present application relates to the technical field of electric tools, and in particular to an electric glue gun and a control method thereof. Background Art

[0002] An electric glue gun is a tool that can automatically apply glue or squeeze glue. The controller in the electric glue gun controls the motor to drive the push rod to achieve glue extrusion. It is widely used in industries such as building decoration, electronic appliances, and automotive parts. Compared with manual glue guns, it has the characteristics of high automation, convenience, and labor saving. However, the control logic of electric glue guns in related technologies is still not precise enough. After the user releases the trigger, glue leakage and other problems often occur, which not only wastes resources but also makes cleaning inconvenient.

[0003] This section provides background information related to the present application which is not necessarily prior art. Summary of the invention

[0004] One object of the present application is to solve or at least alleviate part or all of the above problems. To this end, one object of the present application is to provide an electric glue gun and a control method thereof.

[0005] In order to achieve the above objectives, this application adopts the following technical solutions:

[0006] An electric glue gun comprises: an ejection mechanism for installing a glue cartridge and extruding glue; a motor for driving the ejection mechanism to extrude the glue; a shell supporting the ejection mechanism and forming a housing for accommodating the motor and a handle for a user to hold; an operating switch for a user to operate so that the glue is extruded as the user wishes; a controller for controlling the motor to drive the ejection mechanism; wherein the controller is configured to: when the operating switch moves in a starting direction, control the motor to remain stopped within a first position interval when the operating switch is in the first position interval, and increase the speed after stepping out of the first position interval; when the operating switch moves in a stopping direction, control the motor to decelerate before the operating switch steps into a second position interval, and remain stopped within the second position interval; a second position point for starting to stop within the second position interval is located at the rear side in the starting direction relative to a first position point for ending to stop within the first position interval.

[0007] In some embodiments, the second position interval has a larger range than the first position interval.

[0008] In some embodiments, the controller is further configured as follows: when the operating switch moves in the starting direction, the control motor increases from a first constant low speed to a first constant high speed when the operating switch is in a third position interval; when the operating switch moves in the stopping direction, the control motor decreases from a second constant high speed to a second constant low speed when the operating switch is in a fourth position interval; the fourth position point where the speed reduction ends in the fourth position interval is located on the rear side in the starting direction compared to the third position point where the speed increase starts in the third position interval.

[0009] In some embodiments, the fourth position interval has a smaller range than the third position interval.

[0010] In some embodiments, the controller is further configured to: when the operating switch moves within the intersection of the second position interval and the third position interval, when the moving direction of the operating switch is switched from the starting direction to the stopping direction, control the motor to stop.

[0011] In some embodiments, the controller is further configured as follows: when the operating switch moves in the start direction, the control motor maintains a first constant low speed in the fifth position interval until it enters the third position interval after the operating switch steps out of the first position interval; when the operating switch moves in the stop direction, the control motor maintains a second constant low speed in the sixth position interval until it enters the second position interval after the operating switch steps out of the fourth position interval.

[0012] In some embodiments, the controller is further configured to: when the operating switch moves in the shut-off direction, control the motor to reverse within the seventh position interval after the operating switch steps out of the second position interval, so that the push rod in the ejection mechanism returns to a preset position.

[0013] In some embodiments, the controller is further configured to: when the operating switch moves in the starting direction, based on the first mapping relationship between the switch position and the motor speed, set the current starting speed of the motor to the motor speed corresponding to the current switch position in the first mapping relationship; when the operating switch moves in the stopping direction, based on the second mapping relationship between the switch position and the motor speed, set the current stopping speed of the motor to the motor speed corresponding to the current switch position in the second mapping relationship.

[0014] In some embodiments, the operating switch is a trigger, which is rotatably connected to the handle; the switch position is characterized by the angle formed between the trigger and the handle when the trigger rotates around the axis.

[0015] A control method for an electric glue gun, comprising: when the controller detects that an operating switch moves in a starting direction, the controller controls a motor to remain stopped when the operating switch is in a first position interval, and controls the motor to increase speed after the operating switch steps out of the first position interval; when the controller detects that the operating switch moves in a stopping direction, the controller controls the motor to decrease speed before entering a second position interval, and controls the motor to remain stopped when the operating switch is in the second position interval; a second position point in the second position interval at which the motor is controlled to stop is located at the rear side in the starting direction relative to a first position point in the first position interval at which the motor is controlled to stop.

[0016] The benefit of the present application lies in that: in the process of moving the operating switch in the electric glue gun along the starting direction and along the stopping direction, different stroke-speed mapping relationships are used to control the motor speed, so that the electric glue gun can be quickly stopped during the trigger release process to avoid glue leakage and the like, and can adapt to working scenarios such as corners, and a certain range of motor speed adjustment based on the trigger stroke is maintained in both the starting direction and the stopping direction, so that the user still has the freedom to adjust the colloid extrusion rate, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a three-dimensional diagram of an electric glue gun as an embodiment of the present application;

[0018] Figure 2 yes Figure 1 A plan view of part of the internal structure of the electric glue gun shown;

[0019] Figure 3 yes Figure 1 The electrical control schematic diagram of the operating switch and controller in the electric glue gun shown;

[0020] Figure 4 yes Figure 3 A comparison diagram of the first and second mapping relationships between the switch position and the motor speed respectively adopted by the controller when the operating switch moves in the start direction and in the stop direction;

[0021] Figure 5 yes Figure 4 The schematic diagram of the mapping relationship between the switch position and the motor speed used by the controller to control the motor speed when the operating switch moves in the starting direction;

[0022] Figure 6 yes Figure 4 The schematic diagram of the mapping relationship between the switch position and the motor speed used by the controller to control the motor speed when the operating switch moves in the shutdown direction;

[0023] Figure 7It is a schematic diagram of the mapping relationship between the switch position and the motor speed used by the controller to control the motor speed;

[0024] Figure 8 yes Figure 4 Another schematic diagram of the mapping relationship between the switch position and the motor speed used by the controller to control the motor speed when the operating switch moves in the shutdown direction;

[0025] Fig. 9 yes Figure 3 Another comparison diagram of the first and second mapping relationships between the switch position and the motor speed respectively adopted by the controller when the operating switch moves in the closing direction and moves in the closing direction;

[0026] Fig.10 yes Fig. 9 A schematic diagram showing the mapping relationship between the switch position and the motor speed used by the controller in the electric glue gun to control the motor speed when the operating switch moves in the starting direction;

[0027] Fig.11 yes Fig. 9 A schematic diagram showing the mapping relationship between the switch position and the motor speed used by the controller in the electric glue gun to control the motor speed when the operating switch is moved in the shut-down direction;

[0028] Fig.12 It is a flow chart of a control method of an electric glue gun as an embodiment of the present application. DETAILED DESCRIPTION

[0029] Before any embodiments of the application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the above drawings.

[0030] In this application, the terms "comprises", "includes", "has" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device 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 device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device that includes the element.

[0031] In this application, the term "and / or" is a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects before and after are in an "and / or" relationship.

[0032] In the present application, the terms "connect", "combine", "couple", and "install" may refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, direct connection refers to two parts or components being connected together without the need for an intermediate piece, and indirect connection refers to two parts or components being connected to at least one intermediate piece respectively, and the two parts or components being connected via the intermediate piece. In addition, "connect" and "couple" are not limited to physical or mechanical connections or couplings, and may include electrical connections or couplings.

[0033] In the present application, it will be understood by those of ordinary skill in the art that relative terms (e.g., "about," "approximately," "substantially," etc.) used in conjunction with quantities or conditions include the values ​​and have the meaning indicated by the context. For example, the relative terms include at least the degree of error associated with the measurement of a specific value, the tolerances caused by manufacturing, assembly, and use associated with a specific value, and the like. Such terms should also be considered to disclose a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to plus or minus a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. In addition, "substantially" may refer to plus or minus a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) on the basis of the indicated angle when expressing a relative angular position relationship (e.g., substantially parallel, substantially perpendicular).

[0034] In this application, it will be understood by those skilled in the art that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0035] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, the bottom can include directly below, lower left, lower right, lower front, and lower back, etc.

[0036] In this application, the terms "controller", "processor", "central processing unit", "CPU", and "MCU" are interchangeable. When a unit "controller", "processor", "central processing unit", "CPU", or "MCU" is used to perform a specific function, unless otherwise specified, these functions can be performed by a single unit or multiple units.

[0037] In the present application, the terms “device”, “module” or “unit” may be implemented in the form of hardware or software to achieve specific functions.

[0038] In this application, the terms "calculate", "judge", "control", "determine", "identify", etc. refer to the operations and processes of a computer system or similar electronic computing device (e.g., controller, processor, etc.).

[0039] The technical solution proposed in this application is described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] Figure 1 The electric glue gun 100 as an embodiment of the present application is shown. The electric glue gun 100 includes a housing 10, a motor 20 and an ejection mechanism 30. Figure 2 As shown, a first accommodating cavity 111 is formed inside the housing 10, and the motor 20 is disposed in the first accommodating cavity 111 of the housing 10. The housing 10 is also formed with a handle 112 for the user to hold. The motor 20 is used to drive the ejection mechanism 30 so that the ejection mechanism 30 can realize the extrusion of the colloid. The change in the motor speed can cause the change in the colloid extrusion rate. The motor 20 can be a brushless motor 20 to reduce the size of the electric glue gun 100. In some embodiments, the electric glue gun 100 also includes a speed change device, such as a gearbox. The speed change device can be disposed in the first accommodating cavity 111 of the housing 10, between the motor shaft and the output shaft 211, to transmit the driving force of the motor 20 and make the output shaft 211 rotate at a suitable speed. The specific structure and implementation method can refer to the relevant technology and will not be repeated.

[0041] The ejection mechanism 30 includes a push rod 312, a transmission mechanism 313, and a locking mechanism 314, and has a second accommodating chamber 311. A rubber cartridge 315 is installed and fixed in the second accommodating chamber 311, and a colloid is contained in the rubber cartridge 315. The housing 10 is formed with a bracket 113, and the bracket 113 extends from the housing 10 and supports the rubber cartridge 315. In some embodiments, a dripper 316 is detachably mounted on the front end of the rubber cartridge 315, and the dripper 316 can be connected to the rubber cartridge 315 in a threaded mounting manner. In addition, a plurality of narrow grooves can be provided on the outer surface of the rubber cartridge 315 to reduce the weight of the rubber cartridge 315 and play an anti-slip role.

[0042] refer to Figure 2The push rod 312 can move in the front and rear directions along the first straight line 101. When the push rod 312 is driven to move forward, the push rod 312 generates an extrusion force on the colloid to make it flow out of the rubber wrapping the colloid, and the colloid will be squeezed out from the rubber tube 315. In some embodiments, the push rod 312 can be a screw rod 312 with an external thread, which can also be formed with a flat position to prevent itself from rotating during the sliding process. Specifically, the external thread on the screw rod 312 can be discontinuous, and after passing through a section of external thread in the direction of the first straight line 101, it can be a section of smooth plane, so that the screw rod 312 only slides when driven by the push rod rotating member, and does not rotate. In some embodiments, a head is provided at the front end of the push rod 312, which is connected to one end of the push rod 312 and is pushed by the push rod 312 to squeeze the colloid, and the head can be disc-shaped to facilitate applying pressure to the colloid.

[0043] The transmission mechanism 313 is used to drive the push rod 312 to move along the first straight line 101. The transmission mechanism 313 is formed or connected with a push rod rotating member, and the output shaft 211 drives the push rod rotating member to rotate. The push rod 312 passes through the push rod rotating member and is driven as the push rod rotating member rotates. The locking mechanism 314 is arranged between the push rod 312 and the transmission mechanism 313. When the locking mechanism 314 is locked, the push rod 312 can slide in one direction of the front and rear directions, and cannot slide in the other direction. When the locking mechanism 314 is unlocked, the push rod 312 can slide freely in the front and rear directions. The locking mechanism 314 can make the user's operation of replacing the glue cartridge 315 easier and more convenient, and enhance the continuity of the glue application operation. In some embodiments, the electric glue gun 100 is equipped with an unlocking button for unlocking the locking mechanism 314.

[0044] refer to Figure 3 The electric glue gun 100 further includes an operation switch 40 and a controller 50 .

[0045] The operation switch 40 is operated by the user to make the colloid be extruded according to the user's wishes. For example, the operation switch 40 is operated by the user to extrude the colloid, stop extruding the colloid, and adjust the colloid extrusion rate. The operation switch 40 is movably connected to the handle 112 of the housing 10 and can move relative to the housing 10 in at least one direction. Specifically, the operation switch 40 can be slidably connected to the housing 10 and move in a straight line direction, or can be rotatably connected to the housing 10 and rotate around an arc direction. During the relative movement of the operation switch 40 and the housing 10, the housing 10 is used as a reference, and the position of the operation switch 40 relative to the housing 10 is the switch position of the operation switch 40. In this embodiment, the operating switch 40 can be a trigger 40, which is rotatably connected to the handle 112 and can form an angle with the handle 112 within a preset angle range. The angle between the two can represent the switch position where the trigger 40 is located. The user's operation of pulling or releasing the trigger 40 will change the trigger position, that is, change the angle between the trigger 40 and the handle 112. For example, the trigger position can be any angle value within 0 to 45°, or any angle value within 5 to 35°. The trigger position can also be identified by a numerical value that is linearly related to the angle. In the following text, the trigger 40 will be used to replace the operating switch 40, and the trigger position will be used to replace the switch position to describe the relevant content, but this does not constitute a specific limitation on the present application.

[0046] The controller 50 may at least include a processor 51 and a memory 52 storing executable instructions of the processor 51. The processor 51 will read and run the executable instructions stored in the memory 52 to complete tasks such as controlling the motor 20. The processor 51 may specifically be an MCU (Microcontroller Unit), an ARM (Advanced Reduced Instruction Set Computing Machine), a DSP (Digital Signal Processor), etc. The memory 52 may be a ROM (Read-Only Memory), a RAM (Random Access Memory), a FLASH (FLASH EEPROM), or a combination thereof.

[0047] The controller 50 is directly or indirectly connected to the trigger 40 through a related sensor to detect the position and moving direction of the trigger 40, and then the motor speed is controlled based on the trigger position, moving direction, etc., so that the colloid is squeezed out according to the user's intention when operating the trigger 40. In some embodiments, the trigger 40 can be connected to one end of a rod, and the other end of the rod can be connected to the moving end of the sliding rheostat. The operation of pulling or releasing the trigger 40 will drive the movement of one end of the rod, and then the other end of the rod drives the moving end of the sliding rheostat to move, thereby causing the resistance value of the sliding rheostat to change. When the trigger 40 is in different positions, the resistance value of the sliding rheostat will be different accordingly. The changed resistance value can be converted into a corresponding voltage or current signal through a related circuit. The controller 50 can collect the voltage or current signal to detect the trigger position and its moving direction, and then adjust the motor speed accordingly.

[0048] refer to Figures 4 to 6 , the controller 50 can be based on Figure 5 or Figure 6 The mapping relationship between the trigger position and the motor speed shown adjusts the motor speed, and the corresponding motor speed is determined by the currently detected trigger position, and then the motor speed is set to the target speed corresponding to the current trigger position by adjusting the duty cycle, etc., so as to realize the dynamic change of the motor speed during the movement of the trigger 40. Specifically. The first mapping relationship between the trigger position and the motor speed used by the controller 50 when the trigger 40 is in the starting direction is different from the second mapping relationship between the trigger position and the motor speed used when the trigger 40 is in the stopping direction. For example, Figure 5 FIG. 4 shows a first mapping relationship between the trigger position and the motor speed when the trigger 40 moves in the starting direction. Figure 6 The second mapping relationship between the trigger position and the motor speed when the trigger 40 moves in the closing direction is shown.

[0049] When the trigger 40 moves in the start direction, the trigger 40 is pulled, and it is in the stroke direction of the electric glue gun 100 from the non-operating state to the operating state. For example, when the angle between the trigger 40 and the handle 112 decreases, the trigger 40 is in the start direction. When the trigger 40 moves in the shutdown direction, the trigger 40 is released, and it is in the stroke direction of the electric glue gun 100 from the operating state to the non-operating state. For example, when the angle between the trigger 40 and the handle 112 increases, the trigger 40 is in the shutdown direction. In this embodiment, the trigger position can be numerically identified, and the trigger stroke can correspond to a preset angle range. When the trigger 40 moves in the start direction, the trigger position value increases, and the angle between the trigger 40 and the handle 112 decreases. When the trigger 40 moves in the shutdown direction, the trigger position value decreases, and the angle between the trigger 40 and the handle 112 increases. For example, the trigger travel can be set to trigger positions 0 to 8, and the trigger positions 0 to 8 can be linearly corresponding to the angle 35° to 5° between the trigger 40 and the handle 112. For example, trigger position 0 corresponds to an angle of 35°, trigger position 4 corresponds to an angle of 20°, and trigger position 8 corresponds to an angle of 5°.

[0050] It should be noted that Figure 5 , Figure 6 The mapping relationship between the trigger position and the motor speed shown represents a control logic inside the controller 50, which is the control effect that the electric glue gun 100 aims to achieve under an ideal state, rather than the control result actually presented by the electric glue gun 100. In other words, Figure 7 As shown, when the trigger 40 moves in the starting direction and is at trigger position 5, a jump in the motor speed is generated in the first mapping relationship. The motor speeds before and after the jump edge are half of the full speed and full speed respectively. The controller 50 can set the PWM duty cycle to 50% before the trigger position reaches the jump edge, and set the PWM duty cycle to 100% after the trigger position passes the jump edge. However, in fact, after the trigger position exceeds 5, the motor speed does not immediately increase from half of the full speed corresponding to the 50% duty cycle to full speed, but needs to go through a certain length of speed increase process before it can increase to full speed.

[0051] When the controller 50 detects that the trigger 40 moves in the starting direction, the controller 50 controls the motor 20 to remain stopped when the trigger 40 is in the first position interval, and controls the motor 20 to increase speed after the trigger 40 steps out of the first position interval. The trigger position point at which the stop control ends in the first position interval is the first position point. Under ideal conditions, when the user pulls the trigger 40, the colloid is not extruded when the trigger 40 is in the first position interval. After the trigger 40 passes the first position point, the greater the angle at which the user pulls the trigger 40, the faster the colloid extrusion rate. In this embodiment, the controller 50 can adjust the motor speed by setting the PWM duty cycle, and the method of controlling the motor 20 to stop includes setting the PWM duty cycle to 0, and the first position interval is a moving range of the trigger position. Within the moving range, the controller 50 sets the PWM duty cycle to be constant at 0, and when the trigger 40 moves along the starting direction and steps out of the moving range, the controller 50 can linearly or nonlinearly increase the PWM duty cycle to increase the motor speed. The trigger position point in the trigger stroke at which the shutdown control ends and the linear or nonlinear increase of the PWM duty cycle begins is the first position point. Of course, the controller 50 can also use other methods to adjust the motor speed and control the motor 20 to stop. For example, the FOC method can be used to adjust the motor speed, or the controller 50 can be considered to set the PWM duty cycle to an extremely low value to control the motor 20 to stop.

[0052] like Figure 5 As shown, taking the trigger position from 0 to 8 as an example, the trigger 40 moves in the start direction, the trigger position value increases, and the trigger position will increase from 0 to 8. Assuming that the first position interval is the trigger position from 0 to 2, the first position point is the trigger position 2. The controller 50 will set the PWM duty cycle to be constant to 0 during the process of the trigger position moving from 0 to 2 along the start direction. For example, when the trigger position is 0.7, 1.2, 1.9, etc., the PWM duty cycle is set to 0. After the trigger position steps out of the first position interval [0, 2], the controller 50 will set the PWM duty cycle to increase linearly during the process of the trigger position moving from 2 to 8 along the start direction. For example, during the process of the trigger position moving from 2 to 7 along the start direction, the PWM duty cycle increases from 0 to 100%, when the trigger position is 3, the PWM duty cycle is 20%, when the trigger position is 5, the PWM duty cycle is 60%, when the trigger position is 7, the PWM duty cycle is 100%, and when the trigger position is 8, the PWM duty cycle is 100%.

[0053] When the controller 50 detects that the trigger 40 moves in the shutdown direction, the controller 50 controls the motor 20 to decelerate before the trigger 40 enters the second position interval, and controls the motor 20 to remain stopped when the trigger 40 is in the second position interval. The trigger position point at which the shutdown control starts in the second position interval is the second position point, and the second position point is located at the rear side of the first position point in the startup direction. In an ideal state, when the user releases the trigger 40, the greater the angle at which the user releases the trigger 40 before the trigger 40 passes the second position point, the slower the colloid extrusion rate. When the trigger 40 is in the second position interval, the colloid stops being extruded. From the startup perspective, the first position point at which the colloid starts to be extruded is earlier than the second position point at which the colloid is no longer extruded. From the shutdown perspective, the second position point at which the colloid is no longer extruded is earlier than the first position point at which the colloid starts to be extruded. In this embodiment, the second position interval is another moving range of the trigger position that is different from the first position interval. Within this moving range, the controller 50 still sets the PWM duty cycle to be constant at 0, but the movement direction of the trigger 40 within this moving range is opposite to that of the previous text. Before the trigger 40 enters the moving range in the shutdown direction, the controller 50 has linearly or nonlinearly gradually reduced the PWM duty cycle to reduce the motor speed. The trigger position point in the trigger stroke that starts the shutdown control and ends the linear or nonlinear reduction of the PWM duty cycle is the second position point. Taking the trigger stroke in the starting direction as the reference system, the trigger position point at which the controller 50 starts the shutdown control when shutting down the motor 20 is earlier than the trigger position point at which the shutdown control ends when starting the motor 20.

[0054] like Figure 6As shown, still taking the trigger position from 0 to 8 as an example, the trigger 40 moves in the closing direction, the trigger position value decreases, and the trigger position will decrease from 8 to 0. Assuming that the second position interval is the trigger position 6 to 0, the second position point is the trigger position 6. Before the trigger position enters the second position interval [6, 0], the controller 50 sets the PWM duty ratio to decrease linearly in the process of the trigger position moving from 8 to 6 along the closing direction. For example, in the process of the trigger position moving from 7 to 6, the PWM duty ratio decreases from 100% to 0. When the trigger position is 6.5, the PWM duty ratio is 50%, and when the trigger position is 6, the PWM duty ratio is 0. In the process of the trigger position moving from 6 to 0 along the closing direction, the PWM duty ratio is set to be constant to 0. For example, when the trigger position is 5.7, 5.3, 3.4, 2.6, 1.9, 0.8, etc., the PWM duty ratio is set to 0. And the trigger position 6 is located on the rear side of the trigger position 2 in the starting direction, and is located on the front side of the trigger position 2 in the closing direction. When the trigger 40 passes through the partial position point in the starting direction for controlling the speed increase of the motor 20 along the closing direction, the motor 20 has stopped. For example, when the trigger 40 moves through the trigger position 5 in the starting direction, the controller 50 sets the PWM duty cycle to 60%, and when the trigger 40 moves through the trigger position 5 in the closing direction, the controller 50 has controlled the motor 20 to remain stopped and sets the PWM duty cycle to 0.

[0055] In the embodiment described above, the electric glue gun 100 adjusts the motor speed based on the mapping relationship between the trigger position and the motor speed. The first mapping relationship used when the trigger 40 moves in the start direction is different from the second mapping relationship used when the trigger 40 moves in the stop direction. Even if passing the same trigger position point, the motor 20 can be in different operating states due to different moving directions. In this embodiment, the controller 50 controls the motor speed to first keep it stopped and then speed up when the trigger 40 moves along the starting direction, and the dividing position point for ending the shutdown and starting to speed up is the first position point. At the same time, the controller 50 controls the motor speed to first slow down and then keep it stopped when the trigger 40 moves along the closing direction, and the dividing position point for ending the speed reduction and starting to stop is the second position point. The second position point is set to be on the rear side of the first position point in the starting direction, so that when the electric glue gun 100 is shut down, the motor 20 reaches the shutdown state earlier, avoiding problems such as glue leakage, and can adapt to operating scenarios such as gluing at corners, and in the starting and closing directions, there is still a certain range for adjusting the motor speed based on the stroke of the trigger 40, and the user can still enjoy the freedom to adjust the gluing rate, which effectively improves the user experience.

[0056] In some embodiments, reference Figure 8In order to further improve the glue leakage problem and avoid resource waste, when the controller 50 detects that the trigger 40 moves in the closing direction, the controller 50 controls the motor 20 to reverse after the trigger 40 steps out of the second position interval and is in the seventh position interval, so that the push rod 312 in the ejection mechanism 30 retreats to the preset position. Specifically, one end of the seventh position interval is adjacent to the second position interval, and the other end is the trigger position 0. The controller 50 turns on the switch tube in a forward manner in the second position interval and sets the PWM duty cycle to 0, and turns on the switch tube in a reverse manner and sets the PWM duty cycle to a preset value after entering the seventh position interval, so that the motor 20 reverses a preset number of times, and the push rod 312 in the ejection mechanism can retract a preset distance. Among them, the retraction distance value of the push rod 312 can achieve the effect of not causing glue overflow and not making the idle stroke of the trigger 40 too long when it is started next time. Figure 8 As shown, still taking the trigger position of 0 to 8 as an example, the second position interval can be the trigger position of 6 to 1, and the seventh position interval can be the trigger position of 1 to 0. The controller 50 can set the PWM duty cycle to 20% in a reverse manner during the process of the trigger position moving from 1 to 0 along the closing direction.

[0057] In some embodiments, the second position interval may have a greater range than the first position interval, that is, compared with the trigger stroke that keeps the motor 20 stopped during startup, the trigger stroke that keeps the motor 20 stopped during shutdown is longer, so that the user can perform shutdown control over more trigger strokes during the process of shutting down the electric glue gun 100. Figure 5 , Figure 6 as well as Figure 8 As shown, the interval range of the second position interval [6, 0] or the second position interval [6, 1] is larger than the first position interval [0, 2].

[0058] In some embodiments, when the controller 50 detects that the trigger 40 moves in the starting direction, the controller 50 controls the motor 20 to increase from the first constant low speed to the first constant high speed when the trigger 40 is in the third position interval, wherein the trigger position point in the third position interval where the speed increase control starts is the third position point. Figure 5, the PWM duty cycle corresponding to the first constant low speed is 0, the PWM duty cycle corresponding to the first constant high speed is 100%, the third position interval is [2, 7], and the third position point is trigger position 2. It can be understood that the process of the controller 50 controlling the motor 20 to increase from the first constant low speed to the first constant high speed in the third position interval may also be nonlinear, the third position interval may not be adjacent to the first position interval, the third position point may be the same point as the first position point when the third position interval is adjacent to the first position interval, and may be a different point from the first position point when the third position interval is not adjacent to the first position interval.

[0059] When the controller 50 detects that the trigger 40 moves in the shutdown direction, the controller 50 controls the motor 20 to decrease from the second constant high speed to the second constant low speed when the trigger 40 is in the fourth position interval, wherein the trigger position point where the speed reduction control ends in the fourth position interval is the fourth position point, and the fourth position point is located at the rear side of the third position point in the startup direction. In an ideal state, from the startup perspective, the third position point where the trigger 40 is located when the colloid begins to be extruded at an accelerated speed is earlier than the fourth position point when the colloid extrusion rate drops to the lowest point, and from the shutdown perspective, the fourth position point where the trigger 40 is located when the colloid extrusion rate drops to the lowest point is earlier than the third position point when the colloid begins to be extruded at an accelerated speed. Reference Figure 6 , Figure 8 , the PWM duty cycle corresponding to the second constant high speed is 100%, the PWM duty cycle corresponding to the second constant low speed is 0%, the fourth position interval is [7, 6], the fourth position point is trigger position 6, the trigger position 6 is located at the rear side of trigger position 2 in the start direction, and is located at the front side of trigger position 2 in the shutdown direction. When the trigger 40 passes through the partial position point in the start direction that controls the motor 20 to increase its speed, the motor 20 has finished decelerating. For example, when the electric glue gun 100 is started, the trigger 40 passes the trigger position 5, and the motor 20 is still in the acceleration stage, but when the electric glue gun 100 is shut down, the trigger 40 passes the trigger position 5, and the deceleration stage of the motor 20 has ended. It can be understood that the process of the controller 50 controlling the motor 20 to decrease from the second constant high speed to the second constant low speed in the fourth position interval can also be nonlinear, the second constant low speed can not be equal to the first constant low speed, the second constant high speed can not be equal to the first constant high speed, the fourth position interval can not be adjacent to the second position interval, and the fourth position point and the second position point can be different points.

[0060] In some embodiments, the range of the fourth position interval may be smaller than the third position interval, that is, compared with the trigger stroke that increases the speed of the motor 20 when starting, the trigger stroke that decreases the speed of the motor 20 when shutting down is shorter, so that the trigger 40 can achieve deceleration with a shorter stroke when the user shuts down the electric glue gun 100. Figure 5 , Figure 6 as well as Figure 8As shown, the interval range of the fourth position interval [7, 6] is smaller than that of the third position interval [2, 6].

[0061] In some embodiments, when the controller 50 detects that the trigger 40 moves within the intersection of the second position interval and the third position interval, and the movement direction of the trigger 40 switches from the start direction to the stop direction, the controller 50 can control the motor 20 to stop. Figure 5 , Figure 8 As shown, the second position interval is [6, 1], the third position interval is [2, 7], and the intersection interval of the second and third position intervals is [2, 6]. When the trigger position of the controller 50 moves from 2 to 6 along the start direction, the controller 50 based on Figure 5 The first mapping relationship shown in FIG. 1 increases the PWM duty ratio linearly with the trigger position to increase the motor speed and accelerate the colloid extrusion. If the trigger 40 switches the moving direction at any position in the intersection interval [2, 6], for example, the trigger 40 changes to move in the closing direction after reaching the trigger position 3, that is, the user releases the trigger 40 after pulling the trigger 40 to the trigger position 3, then the controller 50 changes to the switching direction based on Figure 8 The second mapping relationship shown controls the motor 20 to stop, so that the motor 20 is controlled to stop quickly when the motor speed has not reached the full speed state corresponding to the 100% duty cycle, so that the colloid is no longer squeezed out, glue leakage is avoided, and cleanliness is maintained.

[0062] In some embodiments, reference Fig.10 , after the motor 20 starts or ends the acceleration and deceleration, a short constant speed zone is set to cache and stabilize the colloid extrusion rate. When the controller 50 detects that the trigger 40 moves in the starting direction, the controller 50 can control the motor 20 to maintain the first constant low speed when the trigger 40 is in the fifth position interval until it enters the third position interval after the trigger position steps out of the first position interval. Specifically, the controller 50 can set the PWM duty cycle to be the duty cycle corresponding to the first constant low speed when the trigger 40 is in the fifth position interval. Among them, the fifth position interval is adjacent to the first position interval and the third position interval. When the trigger 40 moves along the starting direction, it will pass through the first position interval, the fifth position interval and the third position interval in sequence. Fig.10 As shown, still taking trigger positions 0 to 8 as an example, in the starting direction, they are the first position interval [0, 2], the fifth position interval [2, 3] and the third position interval [3, 7] respectively. In this case, the first position point and the third position point will be different points, the first position point is trigger position 2, and the third position point is trigger position 3.

[0063] refer to Fig. 9 , Fig.11When the controller 50 detects that the trigger 40 moves in the closing direction, the controller 50 can control the motor 20 to maintain the second constant low speed when the trigger 40 is in the sixth position interval after the trigger position steps out of the fourth position interval until it enters the second position interval. Specifically, the operator can set the PWM duty cycle to be the duty cycle corresponding to the second constant low speed when the trigger 40 is in the sixth position interval. The sixth position interval is adjacent to the second position interval and the fourth position interval. When the trigger 40 moves in the closing direction, it will pass through the fourth position interval, the sixth position interval, the second position interval and the seventh position interval in sequence. Fig.11 As shown, still taking trigger positions 0 to 8 as an example, in the shutdown direction, they are the fourth position interval [7, 6], the sixth position interval [6, 5], the second position interval [5, 1] ​​and the seventh position interval [1, 0]. In this case, the second position point and the fourth position point will be different points, the second position point is trigger position 5, and the fourth position point is trigger position 6. However, in the starting direction, the second position point is still behind the first position point, and the fourth position point is still behind the third position point.

[0064] It is understandable that the electric glue gun 100 may also include a power supply device such as a DC power supply. Of course, it may also use a mains power supply or an AC power supply, and cooperate with a power adapter or related circuits such as voltage conversion, rectification, and voltage stabilization to realize power supply. The electric glue gun 100 may also include a circuit board assembly. The related circuit system required for the operation of the electric glue gun 100 may be arranged on the circuit board, and the circuit board assembly may be arranged in the first accommodating cavity 111 of the housing 10.

[0065] Correspondingly, Fig.12 A flow chart of a control method of an electric glue gun 100 as an embodiment of the present application is shown. Fig.12 The control method of the electric glue gun 100 shown can be applied to the electric glue gun 100 described above, and the control method may include the following steps:

[0066] S1202, when the controller 50 detects that the operating switch 40 moves in the starting direction, the controller 50 controls the motor 20 to remain stopped when the operating switch 40 is in the first position interval, and controls the motor 20 to increase speed after the operating switch 40 moves out of the first position interval;

[0067] S1204, when the controller 50 detects that the operating switch 40 moves in the shut-down direction, the controller controls the motor 20 to slow down before entering the second position interval, and controls the motor 20 to remain stopped when the operating switch 40 is in the second position interval; the second position point at which the motor 20 is controlled to stop in the second position interval is located at the rear side in the starting direction compared to the first position point at which the motor 20 is controlled to stop in the first position interval.

[0068] In some embodiments, the second position interval has a larger range than the first position interval.

[0069] In some embodiments, the control method also includes: when the controller 50 detects that the operating switch 40 moves in the starting direction, the controller controls the motor 20 to increase from a first constant low speed to a first constant high speed when the operating switch 40 is in a third position interval; when the controller 50 detects that the operating switch 40 moves in the closing direction, the controller controls the motor 20 to decrease from a second constant high speed to a second constant low speed when the operating switch 40 is in a fourth position interval; the fourth position point where the speed reduction ends in the fourth position interval is located behind the third position point where the speed increase starts in the third position interval in the starting direction.

[0070] In some embodiments, the fourth position interval has a smaller range than the third position interval.

[0071] In some embodiments, the control method further includes: when the controller 50 detects that the operating switch 40 moves within the intersection of the second position interval and the third position interval, and the moving direction of the operating switch 40 switches from the start direction to the stop direction, the controller 50 controls the motor 20 to stop.

[0072] In some embodiments, the control method also includes: when the controller 50 detects that the operating switch 40 moves in the start direction, the controller 50 controls the motor 20 to maintain a first constant low speed in the fifth position interval until it enters the third position interval after the operating switch 40 steps out of the first position interval; when the controller 50 detects that the operating switch 40 moves in the stop direction, the controller 50 controls the motor 20 to maintain a second constant low speed in the sixth position interval until it enters the second position interval after the operating switch 40 steps out of the fourth position interval.

[0073] In some embodiments, the control method further includes: when the controller 50 detects that the operating switch 40 moves in the closing direction, the controller 50 controls the motor 20 to reverse in the seventh position interval after the operating switch 40 steps out of the second position interval, so that the push rod 312 in the ejection mechanism returns to the preset position.

[0074] In some embodiments, the control method also includes: when the controller 50 detects that the operating switch 40 moves in the starting direction, based on the first mapping relationship between the switch position and the motor speed, the controller 50 sets the current starting speed of the motor 20 to the motor speed corresponding to the current switch position in the first mapping relationship; when the controller 50 detects that the operating switch 40 moves in the stopping direction, based on the second mapping relationship between the switch position and the motor speed, the controller 50 sets the current stopping speed of the motor 20 to the motor speed corresponding to the current switch position in the second mapping relationship.

[0075] In some embodiments, the operating switch 40 is a trigger 40, which is rotatably connected to the handle 112; the switch position is characterized by the angle formed between the trigger 40 and the handle 112 when the trigger 40 rotates around the axis.

[0076] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the above embodiments do not limit the present application in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present application.

Claims

1. An electric glue gun, comprising: The ejection mechanism is used to install the rubber cartridge and squeeze out the rubber; A motor, used for driving the ejection mechanism to extrude the colloid; A housing, supporting the ejection mechanism and forming a housing cavity for accommodating the motor and a handle for a user to hold; An operating switch for a user to operate so that the colloid is squeezed out according to the user's wishes; A controller, used for controlling the motor to drive the ejection mechanism; Wherein, the controller is configured as: When the operating switch moves in the starting direction, the motor is controlled to remain stopped within the first position interval of the operating switch, and to increase speed after stepping out of the first position interval; When the operating switch moves in the shut-down direction, the motor is controlled to decelerate before the operating switch enters the second position interval, and remains stopped within the second position interval; The second position point at which the machine starts to stop in the second position interval is located laterally in the starting direction than the first position point at which the machine ends to stop in the first position interval.

2. The electric glue gun according to claim 1, wherein: The second position interval has a larger range than the first position interval.

3. The electric glue gun according to claim 1, wherein: The controller is also configured to: when the operating switch moves in the starting direction, control the motor to increase from a first constant low speed to a first constant high speed within the third position interval when the operating switch is in the stopping direction; when the operating switch moves in the stopping direction, control the motor to decrease from a second constant high speed to a second constant low speed within the fourth position interval when the operating switch is in the fourth position interval; a fourth position point within the fourth position interval where the speed reduction ends is located at the rear side in the starting direction compared to the third position point within the third position interval where the speed increase starts.

4. The electric glue gun according to claim 3, wherein: The fourth position interval has a smaller range than the third position interval.

5. The electric glue gun according to claim 3, wherein: The controller is further configured to control the motor to stop when the operating switch moves within the intersection of the second position interval and the third position interval and when the moving direction of the operating switch is switched from the start direction to the stop direction.

6. The electric glue gun according to claim 3, wherein: The controller is also configured to: when the operating switch moves in the start direction, control the motor to maintain the first constant low speed in the fifth position interval after the operating switch steps out of the first position interval until it enters the third position interval; when the operating switch moves in the stop direction, control the motor to maintain the second constant low speed in the sixth position interval after the operating switch steps out of the fourth position interval until it enters the second position interval.

7. The electric glue gun according to claim 1, wherein: The controller is further configured to: when the operating switch moves in the shut-down direction, control the motor to reverse in a seventh position interval after the operating switch steps out of the second position interval, so that the push rod in the ejection mechanism retracts to a preset position.

8. The electric glue gun according to claim 1, wherein: The controller is also configured to: when the operating switch moves in the starting direction, based on a first mapping relationship between the switch position and the motor speed, set the current starting speed of the motor to the motor speed corresponding to the current switch position in the first mapping relationship; when the operating switch moves in the stopping direction, based on a second mapping relationship between the switch position and the motor speed, set the current stopping speed of the motor to the motor speed corresponding to the current switch position in the second mapping relationship.

9. The electric glue gun according to claim 1, wherein: The operating switch is a trigger, and the trigger is rotatably connected to the handle; the switch position is characterized by an angle formed between the trigger and the handle when the trigger rotates around an axis.

10. A method for controlling an electric glue gun, wherein: The method comprises: When the controller detects that the operating switch moves in the starting direction, the controller controls the motor to remain stopped when the operating switch is in a first position interval, and controls the motor to increase speed after the operating switch moves out of the first position interval; When the controller detects that the operating switch moves in the closing direction, the controller controls the motor to slow down before entering the second position interval, and controls the motor to remain stopped when the operating switch is in the second position interval; The second position point at which the motor is started to be controlled to stop in the second position interval is located later in the starting direction than the first position point at which the motor is finished to be controlled to stop in the first position interval.

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