Electric glue gun

Abstract

An electric glue gun comprises a glue gun main shell and a circuit board, the circuit board is located in a battery installation part at the lowermost end of the glue gun main shell, a handle is provided with a control switch, and a control module, a drive circuit module, a power management module, a signal receiving module and a potentiometer are integrated on the circuit board. The driving circuit module, the power management module and the signal receiving module are electrically connected with the control module, the potentiometer and the control switch are electrically connected with the control module through the signal receiving module, and one side of the potentiometer exceeds the edge of the circuit board and is exposed out of the battery mounting part; the potentiometer sends out a gear signal, the control switch sends out a switching signal, the signal receiving module receives the gear signal and the switching signal and sends out a control signal, and the control module receives and processes the control signal and sends out a corresponding driving signal to the driving circuit module. By means of the arrangement, the circuit board structure of the electric glue gun is compact in layout, and the overall space utilization rate is increased.

Description

Technical Field

[0001] This utility model relates to the field of electric glue gun technology, and in particular to a compact electric glue gun. Background Technology

[0002] Currently, with the continuous development of the economy and the progress of society, the hardware industry has experienced vigorous development. People prefer things to be completed quickly to meet their needs. Glue guns are a common tool in the hardware industry for applying adhesive. A glue gun uses a push plate to squeeze out the glue from the glue stick. Glue guns are tools used for sealing and filling gaps, suitable for 310ml plastic bottles of hard-tube glue, glass glue, or sausage glue. They are widely used in industries such as building decoration, electronics, automobiles and auto parts, shipbuilding, and containers.

[0003] Traditional handheld glue guns are mostly used by manually pressing the handle to squeeze the glue tube, which is quite laborious. It is not easy to ensure that the pressure is consistent each time. It is also impossible to control the amount of glue dispensed when squeezing the glue tube. In addition, there is only one way to hold the glue gun, which cannot be selected according to the amount of glue in the glue tube, making the glue gun inconvenient to use.

[0004] To address the aforementioned drawbacks of manual glue guns, electric glue guns have been developed. An electric glue gun is a tool capable of automatically dispensing or extruding glue. Compared to manual glue guns, existing electric glue guns offer a higher degree of automation and are relatively less labor-intensive. However, in current electric glue gun designs, the circuit board is typically installed separately inside the machine. This traditional distributed circuit design often leads to low space utilization, complex circuit layout, significant signal interference, and places high demands on the overall structural design. With the continuous expansion of electric glue gun functions and the increasing demand for ease of use, optimizing circuit board layout, integrating key components, and improving internal space utilization have become crucial issues in glue gun design. Utility Model Content

[0005] In order to overcome the shortcomings and deficiencies of the existing technology, the purpose of this utility model is to provide an electric glue gun to solve the problem of low space utilization in the circuit design of existing electric glue guns.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] An electric glue gun includes a main housing and a circuit board disposed within the main housing. The main housing has a handle, and a battery mounting portion is located at the lower end of the handle. The circuit board is located within the battery mounting portion, and the plane of the circuit board intersects the extension direction of the handle. A control switch is located at the upper end of the handle. The circuit board integrates a control module, a drive circuit module, a power management module, a signal receiving module, and a potentiometer. The drive circuit module, the power management module, and the signal receiving module are all electrically connected to the control module. The potentiometer and the control switch are both electrically connected to the control module through the signal receiving module. One side of the potentiometer extends beyond the edge of the circuit board and protrudes from the battery mounting portion. The potentiometer emits a gear position signal, and the control switch emits a switch signal. The signal receiving module receives the gear position signal and the switch signal and emits a control signal. The control module receives and processes the control signal and emits a corresponding drive signal to the drive circuit module.

[0008] Furthermore, the control module includes an MCU, and the MCU and the drive circuit module are spaced apart in an area on the circuit board.

[0009] Furthermore, the handle has a vertically extending central channel inside, and an electrolytic capacitor is provided on the circuit board, the electrolytic capacitor extending vertically and located within the central channel.

[0010] Furthermore, the circuit board is square, and the potentiometer is located on the left rear edge of the circuit board.

[0011] Furthermore, the circuit board is provided with signal cable pads, which are located on the right rear edge of the circuit board, and the control switch is electrically connected to the signal cable pads via wires.

[0012] Furthermore, the glue gun's main housing is equipped with a push-button switch, which is electrically connected to the signal receiving module and electrically connected to the signal cable pads via wires.

[0013] Furthermore, the electric glue gun includes a battery detachably connected to the battery mounting part, the battery is electrically connected to the power management module, the circuit board is provided with a power cable pad, the power cable pad is located on the left front edge of the circuit board, and the battery is electrically connected to the power cable pad through a wire.

[0014] Furthermore, the circuit board is provided with a light source, which is located on the right edge of the circuit board. The right side of the light source extends beyond the edge of the circuit board and protrudes from the battery mounting portion.

[0015] Furthermore, the potentiometer is a rotary potentiometer, located on the left rear edge of the circuit board, the drive circuit module is located on the left front edge of the circuit board, and the control module is located on the right rear of the drive circuit module.

[0016] Furthermore, the electric glue gun includes a barrel, a push rod, and a drive mechanism. One end of the barrel is connected to the main housing of the glue gun, and the push rod is movably connected to the main housing of the glue gun. The push rod has a first end and a second end. The first end of the push rod extends into the barrel and can move inside the barrel, while the second end is always exposed outside the main housing of the glue gun. The drive mechanism is electrically connected to the drive circuit module and drives the push rod to move.

[0017] The beneficial effects of this utility model are as follows: by intersecting the extension direction of the circuit board and the handle, and integrating the control module, drive circuit module, power management module, signal receiving module and potentiometer on the circuit board, and with one side of the potentiometer extending beyond the edge of the circuit board and protruding from the handle, the circuit structure layout of the electric glue gun is more compact, making reasonable use of space and improving the overall space utilization rate. Attached Figure Description

[0018] Figure 1 This is a front view cross-sectional structural diagram of the electric glue gun in this utility model.

[0019] Figure 2 This is a top view of the electric glue gun in this utility model.

[0020] Figure 3 This is a frontal three-dimensional structural diagram of the push rod in this utility model.

[0021] Figure 4 yes Figure 1 A magnified structural diagram of point A in the middle.

[0022] Figure 5 This is a partial three-dimensional front view of the electric glue gun after the front shell has been removed.

[0023] Figure 6 This is a frontal three-dimensional structural diagram of the drive mechanism in this utility model.

[0024] Figure 7 This is a front view schematic diagram of the drive mechanism of this utility model without the second housing.

[0025] Figure 8 This is a rear view schematic diagram of the second shell structure in this utility model.

[0026] Figure 9 The electric glue gun in this utility model is along Figure 1Schematic diagram of the cross-sectional structure at point BB.

[0027] Figure 10 This is a partial frontal cross-sectional view of the electric glue gun in this utility model.

[0028] Figure 11 This is a rear three-dimensional partial schematic diagram of the electric glue gun with the main housing removed in this utility model.

[0029] Figure 12 yes Figure 1 A magnified structural diagram at point C.

[0030] Figure 13 This is a top-view three-dimensional structural diagram of the stop block in this utility model.

[0031] Figure 14 This is a rear-view three-dimensional structural diagram of the toggle switch in this utility model.

[0032] Figure 15 In this utility model, when the gearbox is in the engaged state, the electric glue gun moves along... Figure 1 A schematic diagram of the cross-sectional structure at point DD.

[0033] Figure 16 In this utility model, when the gearbox is in the disengaged state, the electric glue gun moves along... Figure 1 A schematic diagram of the cross-sectional structure at point DD.

[0034] Figure 17 The electric glue gun in this utility model is along Figure 1 A schematic diagram of the cross-sectional structure at the EE point.

[0035] Figure 18 This is a schematic diagram of the left-side structure of the motor cover plate in this utility model.

[0036] Figure 19 yes Figure 1 A magnified structural diagram at point F in the middle.

[0037] Figure 20 yes Figure 1 A magnified structural diagram of point G in the middle.

[0038] Figure 21 This is one of the circuit structure diagrams of the electric glue gun in this utility model.

[0039] Figure 22 This is the second schematic diagram of the circuit structure of the electric glue gun in this utility model.

[0040] Figure 23 This is a plan view of the electric glue gun in this utility model.

[0041] The meaning of the symbols in the attached image:

[0042] The glue gun consists of the following components: main housing 10, front housing 10a, rear housing 10b, switch mounting cavity 101, drive mechanism mounting cavity 102, slot 103, annular baffle 111, annular limiting rib 112, handle 12, control switch 121, central channel 122, positioning rib 13; barrel 20, glue hose 200; first straight line 201, horizontal plane 202, center straight line 203; push rod 30, first end 31, second end 32, indicator mark 33, serration 34, push plate 35, hook handle 36, push rod protrusion 37; drive mechanism 40, drive motor 41, gearbox 42. 42a, 42b, gear housing 421, 421a, 422, 422a, 422b, 422c, 423, 424a, 424a, 424b, 425, 425a, 425b, 426, 427, 428; 428, 423, 424a, 425a, 426a, 427a, 428; 429, 420a, 421a, 421a, 422a, 422b, 422c, 42 ...a, 422b, 422c, 422a, 422a, 422a, 422b, 422c, 422a, 422a, 422a, 422b, 422c, 31. First bearing hole 431a, locating pin 431b, threaded hole 431c, third bearing hole 431d, second housing 432, second bearing hole 432a, pin hole 432b, through hole 432c, fourth bearing hole 432d, screw 433, first gear shaft 434, first spur gear 434a, second spur gear 434b, second gear shaft 435, third spur gear 435a, first bevel gear 435b, bushing 436; circuit board 50, control module 51, MCU 511, drive circuit module 52, power management module 53, signal connector Module 54, potentiometer 55, signal cable pad 561, power cable pad 562, electrolytic capacitor 57, lighting lamp 58; battery 60; battery mounting part 600; limit switch mechanism 70, push contact switch 71, button 711, sliding push block 72, first abutting boss 721, second abutting boss 722, reset part 73; motor cover plate 80, through hole 801, positioning hole 802, guide straight edge 81, arc edge 82, reinforcing rib 83, positioning groove 831; first distance L1, second distance L2, first center of gravity X1, second center of gravity X2. Detailed Implementation

[0043] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0044] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, components, features, and elements with the same names in different embodiments of this application may have the same meaning or different meanings, the specific meaning of which must be determined by its interpretation in that specific embodiment or further in conjunction with the context of that specific embodiment.

[0045] It should be understood that although the terms first, second, third, etc., may be used in this document to describe various types of information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this document, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the words “if” or “suppose” as used herein can be interpreted as “when…” or “when…” or “in response to determination” or “in response to detection.” Similarly, depending on the context, the phrases “if determination” or “if detection (of the stated condition or event)” can be interpreted as “when determination” or “in response to determination” or “when detection (of the stated condition or event)” or “in response to detection (of the stated condition or event).”

[0046] Furthermore, as used herein, the singular forms “a,” “an,” and “the” are intended to include the plural forms as well, unless the context indicates otherwise. It should be further understood that the terms “comprising,” “including,” indicate the presence of the stated feature, step, operation, element, component, item, type, and / or group, but do not exclude the presence, occurrence, or addition of one or more other features, steps, operations, elements, components, items, types, and / or groups. The terms “or,” “and / or,” “comprising at least one of,” etc., as used in this application, can be interpreted as inclusive, or mean any one or any combination thereof. For example, “comprising at least one of: A, B, C” means “any one of: A; B; C; A and B; A and C; B and C; A and B and C,” and similarly, “A, B, or C” or “A, B, and / or C” means “any one of: A; B; C; A and B; A and C; B and C; A and B and C.” Exceptions to this definition will only occur if the combination of elements, functions, steps, or operations is inherently mutually exclusive in some way.

[0047] Figure 1This is a front view cross-sectional structural diagram of the electric glue gun in this utility model. Figure 2 This is a top view of the electric glue gun in this utility model. Figure 3 This is a frontal three-dimensional structural diagram of the push rod 30 in this utility model. (See diagram below.) Figures 3 to 5 As shown in Embodiment 1 of this utility model, an electric glue gun includes a main housing 10, a barrel 20, a push rod 30, and a drive mechanism 40. One end of the barrel 20 is connected to the main housing 10, and the push rod 30 is movably connected to the main housing 10. The push rod 30 has a first end 31 and a second end 32. The first end 31 of the push rod 30 extends into the barrel 20 and can move within the barrel 20, while the second end 32 is always exposed outside the main housing 10. The drive mechanism 40 is installed inside the main housing 10 and is used to drive the push rod 30 to move within the barrel 20, thereby squeezing the glue tube 200 inside the barrel 20 to achieve the glue dispensing action. Both the barrel 20 and the push rod 30 extend in the left-right direction. The first end 31 is the right end of the push rod 30, and the second end 32 is the left end of the push rod 30. The left end of the barrel 20 is connected to the main housing 10.

[0048] In one embodiment, the electric glue gun can display the remaining glue level. Specifically, the push rod 30 is provided with an indicator 33, which consists of several scales arranged from left to right along the direction from the first end 31 to the second end 32. The scales are directly engraved on the push rod 30 to serve as the indicator 33. By directly setting the indicator 33, composed of several scales, on the push rod 30, the indicator 33 moves synchronously with the push rod 30, clearly showing the current glue application progress and the remaining glue level, providing convenience and simplifying the structure of the electric glue gun. Furthermore, the total length of the electric glue gun gradually decreases during glue application, allowing it to be used in confined spaces when the glue level is low, facilitating its operation. The scales can be processed using laser engraving, also known as laser marking, and the push rod 30 can be made of 45# steel.

[0049] Furthermore, the scale markings of the indicator 33 gradually increase from the second end 32 to the first end 31, meaning the scale markings of the indicator 33 gradually increase from left to right. Therefore, during the glue application process, the scale markings displayed on the push rod 30 will gradually decrease. Optionally, the length of the indicator 33 from the first end 31 to the second end 32 can range from 300mm to 600mm. For example, if the length of the indicator 33 from the first end 31 to the second end 32 is 300mm, the length of the glue tube 200 installed on the electric glue gun will be approximately 300mm. The length of the indicator 33 can be set according to the length of the glue tube 200 to facilitate the installation of a glue tube 200 of the corresponding length on the electric glue gun.

[0050] Furthermore, the push rod 30 has a rectangular cross-section, meaning it is a rectangular rod. The push rod 30 is provided with serrations 34 that mesh with the drive mechanism 40. Specifically, the first spur gear 434a of the drive mechanism 40... Figure 4 The tooth 34 meshes with the push rod 30. The tooth 34 is arranged along the direction from the first end 31 to the second end 32, so that the push rod 30 as a whole forms a rack structure. Optionally, the tooth 34 is provided on the bottom surface of the push rod 30, and the indicator 33 is provided on the top surface and / or side surface of the push rod 30. For example, the indicator 33 can be provided on the top surface of the push rod 30. Of course, the indicator 33 can also be provided on the front side and / or rear side of the push rod 30, or the indicator 33 can be provided on the top surface, front side and rear side of the push rod 30 at the same time, so that the user can observe the remaining amount of glue from multiple directions.

[0051] Optionally, the main housing 10 of the glue gun is provided with a reference mark (not shown) that cooperates with the indicator mark 33, such as a mark line with an arrow, so that the indicator mark 33 can be used for reference and the user can quickly know the amount of glue remaining.

[0052] Furthermore, the push rod 30 has a push plate 35 at its first end 31. The push plate 35 has a circular structure, which facilitates the squeezing of the glue tube 200. The push rod 30 has a hook handle 36 at its second end 32, which facilitates pulling out the push rod 30 when changing the glue tube 200, and also facilitates hanging the electric glue gun on a wall or other object. The hook handle 36 can be made of plastic.

[0053] Figure 4 yes Figure 1 A magnified structural diagram of point A in the middle. Figure 5 This is a partial three-dimensional front view of the electric glue gun after removing the front shell 10a, as described in this utility model. Figure 4 and Figure 5 As shown and referenced Figures 1-3In one embodiment, the electric glue gun has an automatic glue-out protection function, meaning it automatically stops when the glue in the glue tube 200 is used up, and the drive mechanism 40 cannot continue to drive the glue tube 200 to squeeze. Specifically, the push rod 30 has a push rod protrusion 37 at its second end 32, and the glue gun main housing 10 has a limit switch mechanism 70 that cooperates with the push rod protrusion 37. When the first end 31 of the push rod 30 extends to its maximum stroke in the gun barrel 20, that is, when the scale mark of the indicator 33 shows 0, the push rod protrusion 37 can trigger the limit switch mechanism 70 and control the drive mechanism 40 to stop driving the push rod 30 to move. The push rod protrusion 37 is located at the bottom of the hook handle 36 and faces the limit switch mechanism 70. The limit switch mechanism 70 is located at the top of the glue gun main housing 10 and faces the push rod protrusion 37. Thus, when the drive mechanism 40 drives the push rod 30 to move to the right, the push rod protrusion 37 can move to the right along with the push rod 30. When the glue in the glue tube 200 is used up, the first end 31 of the push rod 30 extends into the gun barrel 20 to its maximum stroke. At this time, the push rod protrusion 37 can trigger the limit switch mechanism 70 and control the drive mechanism 40 to stop driving the push rod 30 to move, realizing the automatic glue-out protection function.

[0054] Furthermore, the limit switch mechanism 70 includes a push contact switch 71 and a sliding push block 72. The sliding push block 72 can slide axially (left-right) within the glue gun main housing 10 along the push rod 30. One end of the sliding push block 72 is used to abut against the push contact switch 71, and the other end is used to abut against the push rod protrusion 37. By using a push contact switch 71 instead of a spring-loaded switch in the limit switch mechanism 70, the push contact switch 71 is more stable and reliable. The push contact switch 71 is triggered by the sliding push block 72, thereby reducing the risk of failure of the limit switch mechanism 70.

[0055] Furthermore, the sliding push block 72 has a first abutment 721 on one end (left end) facing the push rod protrusion 37, and a second abutment 722 on one end (right end) facing the press contact switch 71. The first abutment 721 is exposed outside the glue gun main housing 10 on the side facing the push rod protrusion 37, and the second abutment 722 is located inside the glue gun main housing 10 and cooperates with the press contact switch 71. Preferably, the contact surface of the first abutment 721 facing the push rod protrusion 37 is larger than the contact surface of the push rod protrusion 37 facing the first abutment 721. This ensures that even when the push rod 30 is shaken, the push rod protrusion 37 can stably contact the first abutment 721, avoiding the risk of collision between the push rod protrusion 37 and the glue gun main housing 10, which would prevent the press contact switch 71 from being triggered and thus cause functional failure.

[0056] Furthermore, the push-button switch 71 is equipped with a button 711. The pressing direction of the button 711 is the same as the moving direction of the sliding push block 72, that is, both move in the left and right direction. The second abutting boss 722 cooperates with the button 711.

[0057] Furthermore, the limit switch mechanism 70 includes a reset member 73. One end of the reset member 73 abuts against the sliding push block 72, and the other end of the reset member 73 abuts against the glue gun main housing 10. The reset member 73 has a force that causes the sliding push block 72 to move away from the pressing contact switch 71. Optionally, the sliding push block 72 is provided with a receiving groove, and one end (left end) of the reset member 73 is installed in the receiving groove and abuts against the sliding push block 72. The reset member 73 is a compression spring and has a force that causes the sliding push block 72 to move away from the pressing contact switch 71 in the initial state. Of course, in other embodiments, since the button 711 of the pressing contact switch 71 has a certain reset force, the reset member 73 may not be necessary.

[0058] Furthermore, the glue gun main housing 10 is provided with a switch mounting cavity 101 for accommodating the limit switch mechanism 70. An annular baffle 111 is provided in the switch mounting cavity 101. The annular baffle 111 is located between the press contact switch 71 and the sliding push block 72. The end of the reset member 73 facing the press contact switch 71 (the right end) abuts against the annular baffle 111. The annular baffle 111 can restrict the movement of the reset member 73 in the left and right directions.

[0059] Furthermore, the switch mounting cavity 101 is provided with an annular limiting rib 112 on the side facing the push rod protrusion 37. The annular limiting rib 112 is located at the opening of the switch mounting cavity 101. The annular limiting rib 112 cooperates with the sliding push block 72 and restricts the movement of the sliding push block 72 within the switch mounting cavity 101. Specifically, the annular limiting rib 112 cooperates with the first abutting protrusion 721, thereby preventing the reset member 73 from pushing the sliding push block 72 out of the switch mounting cavity 101.

[0060] Furthermore, the glue gun's main housing 10 is provided with a drive mechanism mounting cavity 102. The drive mechanism 40 is installed in the drive mechanism mounting cavity 102 and interacts with the push rod 30 within the drive mechanism mounting cavity 102. The switch mounting cavity 101 is spaced apart from the drive mechanism mounting cavity 102. Thus, when the glue tube 200 bursts, the glue stuck to the push rod 30 will be pulled out directly from the rear end, preventing the glue from flowing back into the switch mounting cavity 101 and causing the limit switch mechanism 70 to malfunction.

[0061] Figure 6 This is a frontal three-dimensional structural schematic diagram of the drive mechanism 40 in this utility model. Figure 7 This is a front view of the drive mechanism 40 in this utility model with the second housing 432 removed. Figure 8 This is a rear view structural diagram of the second housing 432 in this utility model. Figure 9 The electric glue gun in this utility model is along Figure 1 A schematic diagram of the cross-sectional structure at point BB. Figures 6-9 As shown and referenced Figures 1-5 In one embodiment, the drive mechanism 40 includes a drive motor 41, a gearbox 42, and a transmission mechanism 43. The output shaft of the drive motor 41 is connected to the gearbox 42, and the gearbox 42 and the push rod 30 are connected via the transmission mechanism 43. The drive motor 41 drives the push rod 30 to move within the barrel 20 via the gearbox 42 and the transmission mechanism 43. The transmission mechanism 43 is a two-part gearbox structure. The gearbox 42 and the transmission mechanism 43 are used for speed reduction and torque amplification. The power output from the drive motor 41, after multiple stages of speed reduction by the gearbox 42 and the transmission mechanism 43, achieves a large thrust output of approximately 5500N, with a transmission ratio of approximately 1638.74.

[0062] The two-part gearbox structure, i.e., the transmission mechanism 43, includes a first housing 431 and a second housing 432 connected to each other. A gear receiving cavity 43a is formed between the first housing 431 and the second housing 432. The first housing 431 is provided with a first bearing hole 431a and a locating pin 431b. The second housing 432 is provided with a second bearing hole 432a corresponding to the first bearing hole 431a and a pin hole 432b that mates with the locating pin 431b. The number of locating pins 431b and pin holes 432b is the same, and there are at least three of each. The line connecting the centers of at least three locating pins forms a first polygon, and the geometric center of the first polygon is located on the central axis of the first bearing hole 431a. The line connecting the centers of at least three pin holes 432b forms a second polygon, and the geometric center of the second polygon is located on the central axis of the second bearing hole 432a. Both the first housing 431 and the second housing 432 are made of aluminum. The locating pin 431b and the pin hole 432b are interference fits, with a fit tolerance of ±0.01mm. When the first housing and the second housing are assembled, the locating pin and the pin hole are precisely aligned, ensuring that the coaxiality error of the gear shaft is less than ±0.02mm, significantly reducing gear meshing noise (measured noise level dropped from 85dB to 72dB), and extending gear life by more than 30%.

[0063] Furthermore, the three locating pins 431b are distributed in an equilateral triangle, and the three pin holes 432b correspondingly form an equilateral triangle. The geometric center of the equilateral triangle coincides with the axis of the corresponding bearing hole. The symmetrically distributed locating points provide uniform support force, effectively offsetting the thermal deformation stress caused by temperature changes in the housing, so that the gearbox can maintain stable transmission performance in an ambient temperature range of -20℃ to 60℃. The centers of the circumscribed circles of the three locating pins 431b are concentric with the center of the first bearing hole 431a, or in other words, the geometric center of the triangle formed by the line connecting the centers of the three locating pins 431b is located on the central axis of the first bearing hole 431a; the centers of the circles formed by the three pin holes 432b are concentric with the center of the second bearing hole 432a, or in other words, the geometric center of the triangle formed by the line connecting the centers of the three pin holes 432b is located on the central axis of the second bearing hole 432a. This circumferentially distributed structure ensures uniform stress distribution at the locating points, avoiding housing deformation caused by local stress concentration. The measured flatness error of the assembled housing is less than 0.03mm, significantly improving the overall rigidity of the gearbox.

[0064] In some embodiments, the number of locating pins 431b and pin holes 432b can be four, five, or even more. In some embodiments, the center lines connecting at least four locating pins 431b form a first polygon, and the center lines connecting at least four pin holes 432b form a second polygon, both of which are regular polygons. Using regular polygons allows for more uniform force distribution at each locating point, enhancing the stability and accuracy of the positioning. Compared to a smaller number of locating points, more locating points provide more precise constraints, further reducing the possibility of relative displacement and rotation between the first housing 431 and the second housing 432, ensuring a stable positional relationship even under complex operating conditions.

[0065] In this embodiment, in some implementations, all vertices of the first polygon are located on a first circle, the center of which is set on the central axis of the first bearing hole 431a; similarly, all vertices of the second polygon are located on a second circle, the center of which is set on the central axis of the second bearing hole 432a. This design allows the first housing 431 and the second housing 432 to be precisely aligned with the central axes of the first bearing hole 431a and the second bearing hole 432a as a reference during assembly. By associating the vertices of the polygons with circles with specific centers, the geometric properties of the circles can be utilized to better ensure that the distances from each positioning point to the corresponding bearing hole central axis are consistent, thereby ensuring the coaxiality of the first bearing hole 431a and the second bearing hole 432a and providing a strong guarantee for the smooth operation of the gear shaft.

[0066] Furthermore, the transmission mechanism 43 includes a screw 433. The first housing 431 has a threaded hole 431c that mates with the screw 433, and the second housing 432 has a through hole 432c corresponding to the threaded hole 431c. One end of the screw 433 passes through the through hole 432c and is threaded into the threaded hole 431c, thereby fixing the first housing 431 and the second housing 432 together with the screw 433. In this embodiment, four threaded holes 431c and four through holes 432c are correspondingly provided. The threaded holes 431c are located 12mm outside the first polygon, and the through holes 432c are located 12mm outside the second polygon. This arrangement ensures that the tightening force acts on the periphery of the positioning structure, avoiding interference from the screw tightening force on the positioning pin-hole engagement and ensuring the long-term stability of the positioning system.

[0067] Furthermore, the first housing 431 is provided with a third bearing hole 431d, and the second housing 432 is provided with a fourth bearing hole 432d corresponding to the third bearing hole 431d. The transmission mechanism 43 includes a first gear shaft 434 and a second gear shaft 435 disposed in the gear receiving cavity 43a. One end of the first gear shaft 434 is installed in the first bearing hole 431a, and the other end of the first gear shaft 434 is installed in the second bearing hole 432a. One end of the second gear shaft 435 is installed in the third bearing hole 431d, and the other end of the second gear shaft 435 is installed in the fourth bearing hole 432d. Through the design of the dimensional relationship and mold control, the coaxiality error of the third bearing hole 431d and the fourth bearing hole 432d is ensured to be ≤0.015mm, so that the second gear shaft 435 can withstand a larger radial load (tests show that the load-bearing capacity is increased to 8000N), which is particularly suitable for high-intensity glue application operations.

[0068] Furthermore, bearings or bushings 436 are provided in the first bearing hole 431a, the second bearing hole 432a, the third bearing hole 431d and the fourth bearing hole 432d, thereby reducing the friction between the first gear shaft 434 and the second gear shaft 435 and the housing (first housing 431 and second housing 432) and improving the transmission efficiency.

[0069] Furthermore, the first gear shaft 434 is provided with a first spur gear 434a and a second spur gear 434b that rotate synchronously, and the second gear shaft 435 is provided with a third spur gear 435a and a first bevel gear 435b that rotate synchronously. The first spur gear 434a is used to mesh with the sawtooth 34 on the push rod 30, the second spur gear 434b meshes with the third spur gear 435a, and the first bevel gear 435b is used to mesh with the second bevel gear 422c of the transmission 42. Figure 4 They mesh with each other. The push rod 30 has serrated teeth 34 rolled on its surface, which form a precision mesh with the first spur gear 434a.

[0070] Furthermore, a push rod receiving hole 43b is provided between the first housing 431 and the second housing 432. The push rod receiving hole 43b is interconnected with the gear receiving cavity 43a. A portion of the first spur gear 434a extends into the push rod receiving hole 43b and meshes with the sawtooth 34 on the push rod 30. The push rod receiving hole 43b is connected to the gear receiving cavity 43a, and the lower 1 / 3 of the tooth section of the first spur gear 434a extends into the push rod receiving hole 43b, so that the meshing depth between the gear and the sawtooth reaches 4mm, effectively reducing the contact stress on the tooth surface and extending the service life of the gear to more than 500 hours. Switch mounting cavity 101 ( Figure 5 The limit switch mechanism 70 is spaced apart from the gear receiving cavity 43a and the push rod receiving hole 43b, and further separated by the plastic shell of the glue gun main housing 10 and the aluminum shell of the transmission mechanism 43, to prevent glue or lubricating grease from flowing back into the switch mounting cavity 101, thereby further reducing the risk of limit switch mechanism 70 malfunction.

[0071] The electric glue gun also includes a barrel 20 connected to the main housing 10. The barrel 20 is connected to the main housing 10 via a quick-release interface, and the first end 31 of the push rod 30 can extend into the barrel 20. The main housing 10 includes a handle 12 located below the drive mechanism 40. The handle 12 is ergonomically designed with a radius of curvature R50mm at the grip. Combined with the sliding battery compartment of the battery mounting section 600, the glue gun can be placed upright when the battery and glue tube are installed. When not installed, it stands stably on the anti-slip rubber pad on the bottom of the mounting section. This design significantly improves the portability and operational safety of the tool, is suitable for one-handed operation, and reduces fatigue during long-term use.

[0072] Figure 10 This is a partial frontal cross-sectional view of the electric glue gun in this utility model. (See attached image.) Figure 10 As shown and referenced Figures 1-9 In one embodiment, the drive motor 41, the gearbox 42, and the transmission mechanism 43 are arranged sequentially along the axial direction of the drive motor 41. The drive motor 41 is connected to the end of the gearbox 42 away from the barrel 20, and the transmission mechanism 43 is connected to the end of the gearbox 42 facing the barrel 20. That is, the drive motor 41, the gearbox 42, and the transmission mechanism 43 are arranged sequentially from left to right. By connecting the drive motor 41 to the end of the gearbox 42 away from the barrel 20 and the transmission mechanism 43 to the end of the gearbox 42 facing the barrel 20, and distributing the drive motor 41, the gearbox 42, and the transmission mechanism 43 along the left-right direction (i.e., the length direction of the electric glue gun), the electric glue gun can have a roughly symmetrical design in the width direction (front-back direction), making the arrangement of the drive motor 41, the gearbox 42, and the transmission mechanism 43 more compact within the main housing 10 of the glue gun, thereby reducing the volume of the electric glue gun.

[0073] Furthermore, the glue gun's main housing 10 is provided with a handle 12, a gearbox 42 is located directly above the handle 12, a drive motor 41 is located to the upper left of the handle 12, and a transmission mechanism 43 is located to the upper right of the handle 12. Optionally, a control switch 121 is provided at one end of the handle 12 near the drive mechanism 40. One end of the control switch 121 protrudes from the handle 12 towards the barrel 20 and is located directly below the connection between the gearbox 42 and the transmission mechanism 43. The control switch 121 is used to control the operating state of the drive motor 41.

[0074] Furthermore, the electric glue gun includes a circuit board 50 and a battery 60. Both the circuit board 50 and the battery 60 are located at the bottom of the handle 12. The circuit board 50 is located inside the handle 12, and the battery 60 is exposed outside the handle 12 and detachably connected to the handle 12. The drive motor 41, the control switch 121, the press contact switch 71, and the battery 60 are all electrically connected to the circuit board 50.

[0075] Furthermore, the distance between the center of the first gear shaft 434 and the center of the second gear shaft 435 along the axis of the drive motor 41 is a1, where a1 ≤ 13.5 mm. Optionally, the angle between the line connecting the center of the first gear shaft 434 and the center of the second gear shaft 435 and the axis of the drive motor 41 is β, where β ≤ 60°. The center of the second gear shaft 435, the axis of the drive motor 41, and the axis of the transmission 42 are located on a straight line. The distance between the end of the transmission 42 away from the transmission mechanism 43 and the center of the second gear shaft 435 is a2, the distance between the end of the drive motor 41 away from the transmission mechanism 43 and the center of the second gear shaft 435 is a3, and the angular distance between the center of the second gear shaft 435 and the axis of the push rod 30 is h, where a2 ≤ 83 mm, a3 ≤ 143 mm, and h ≤ 46.7 mm. Through the aforementioned dimensional design, a more compact structure is achieved along the axial direction of the drive motor 41 while maintaining a high transmission ratio. Specifically, the axially compact layout shortens the heat conduction path between the motor 41 and the transmission 42 by 42%. Combined with the reasonable ratio of a2 / a3, the temperature rise of key components is reduced by 12°C under the same heat dissipation conditions, extending the service life of the seals. Furthermore, the aforementioned dimensional design improves the mechanical performance of the drive mechanism 40. Specifically, because the gear shaft angle is controlled within 60°, the normal force component at the meshing point is increased by 28%, effectively reducing gear wear. Finite element analysis shows that this angle design improves the uniformity of gear contact stress distribution by 34% and extends fatigue life by 2.3 times.

[0076] Figure 11 This is a rear three-dimensional partial schematic diagram of the electric glue gun with the main housing 10 removed. Figure 12 yes Figure 1 A magnified structural diagram at point C. Figure 13This is a top-view three-dimensional structural diagram of the stop block 424 in this utility model. Figure 14 This is a rear-view three-dimensional structural diagram of the dial 425 in this utility model. Figure 15 In this utility model, when the gearbox 42 is in the closed state, the electric glue gun moves along... Figure 1 A schematic diagram of the cross-sectional structure at point DD. Figure 16 In this utility model, when the gearbox 42 is in the disengaged state, the electric glue gun moves along... Figure 1 A schematic diagram of the cross-sectional structure at point DD. (See diagram below.) Figures 11-16 As shown and referenced Figures 1-10 In one embodiment, the transmission 42 includes a transmission housing 421, a first planetary gear train 422, an internal gear ring 423, a stop block 424, a shift knob 425, and a first elastic element 426. The transmission housing 421 has a gear receiving cavity 42a. The first planetary gear train 422 and the internal gear ring 423 are both located within the gear receiving cavity 42a. The internal gear ring 423 is located on the outer edge of the first planetary gear train 422 and meshes with it. The outer wall of the internal gear ring 423 has multiple grooves 423a. The stop block 424 and the transmission housing 422 are connected. The gearbox housing 421 is slidably connected and can slide on the gearbox housing 421 in a first direction. One end of the stop block 424 extends into the gear receiving cavity 42a and corresponds to the internal gear ring 423. The dial 425 can slide on the gearbox housing 421 in a second direction. There is an angle between the first direction and the second direction. The dial 425 is exposed on the gearbox housing 421 and is used to control the engagement / disengagement state of the stop block 424 and the groove 423a. The first elastic member 426 has a force to drive the stop block 424 toward the internal gear ring 423. Optionally, the first direction and the second direction are perpendicular to each other. The first direction is the up-down direction, and the second direction is the front-back direction. The stop block 424 is located directly below the internal gear ring 423. The dial 425 is located on the rear side of the gearbox 42 and is exposed on the glue gun main housing 10. The dial 425 can move on the glue gun main housing 10 so that the user can press the dial 425.

[0077] Furthermore, the stop block 424 is provided with levers 424a on both sides, the levers 424a being exposed outside the transmission housing 421. The shift knob 425 is provided with an inclined surface 425a that cooperates with the levers 424a, and the side of the lever 424a facing the internal gear ring 423 contacts the inclined surface 425a. Optionally, the side of the lever 424a that contacts the inclined surface 425a is an arc-shaped surface, thereby making it easier for the shift knob 425 to drive the stop block 424.

[0078] Furthermore, the transmission housing 421 is provided with an elongated hole 42b that mates with the lever 424a. Figure 11One end of the lever 424a passes through the elongated hole 42b and protrudes from the elongated hole 42b, allowing the lever 424a to slide within the elongated hole 42b. The elongated hole 42b extends in the same direction as the sliding direction of the stop block 424, i.e., it extends vertically.

[0079] Optionally, the transmission 42 includes a second elastic element 427, which has a force that drives the shift knob 425 to move away from the stop block 424. Both the first elastic element 426 and the second elastic element 427 are compression springs. However, since the first elastic element 426 can drive the stop block 424 to reset, and the stop block 424 and the shift knob 425 are connected by an inclined surface 425a and an arc-shaped surface, the stop block 424 will also drive the shift knob 425 to reset during reset. Therefore, the second elastic element 427 may not be necessary.

[0080] Furthermore, the side of the stop 424 away from the internal gear ring 423 is provided with a first mounting groove 424b. Figure 15 One end of the first elastic member 426 is installed in the first mounting groove 424b, and the other end of the first elastic member 426 abuts against the inner wall of the transmission housing 421. A second mounting groove 425b is provided on the side of the toggle switch 425 facing the stop block 424. Figure 15 One end of the second elastic member 427 is installed in the second mounting groove 425b, and the other end of the second elastic member 427 abuts against the outer wall of the transmission housing 421.

[0081] Furthermore, the first planetary gear train 422 includes a first sun gear 422a and a plurality of first planet gears 422b. The plurality of first planet gears 422b are located on the outer edge of the first sun gear 422a and mesh with the first sun gear 422a. The internal gear ring 423 is located on the outer edge of the plurality of first planet gears 422b and meshes with the plurality of first planet gears 422b. The second bevel gear 422c ( Figure 4 The first sun gear 422a rotates synchronously with the second planetary gear train 428. Optionally, the transmission 42 includes a second planetary gear train 428. Figure 10 The first planetary gear train 422 and the second planetary gear train 428 mesh with each other, meaning the transmission 42 includes multiple planetary gear trains. The output shaft of the drive motor 41 is connected to the transmission mechanism 43 through the planetary gear trains. The planetary gear trains are used to reduce the speed of the drive motor 41, thereby achieving the function of speed reduction and torque increase. The second planetary gear train 428 includes a second sun gear, multiple second planet gears, and an outer gear. The multiple second planet gears are located on the outer edge of the second sun gear and mesh with it. The outer gear is located on the outer edge of the multiple second planet gears and meshes with them. The outer gear is fixed to the housing of the transmission 42 and has teeth on its inner side that mesh with the second planet gears.

[0082] Optionally, the number of second planetary gear trains 428 is 3, and the number of first planetary gear trains 422 is 1, thus, in conjunction with the transmission mechanism 43 and the push rod 30, the entire drive mechanism 40 forms a 7-layer transmission: 4 layers are planetary gear trains (3 second planetary gear trains 428 and 1 first planetary gear train 422) transmission, which has the function of speed reduction and torque increase; 1 layer is bevel gear (first bevel gear 435b and second bevel gear 422c) transmission, which changes the rotation of the transmission 42 along the left-right axis to rotation along the front-back axis; another layer is spur gear (second spur gear 434b and third spur gear 435a) transmission, which has the function of speed reduction and torque increase and changes the height of the rotating shaft; and the last layer is rack and pinion (first spur gear 434a and push rod 30) transmission. By employing a 7-layer composite transmission chain, including a 3-stage planetary gear train (first planetary gear train 422 and three second planetary gear trains 428), a bevel gear reversing mechanism (first bevel gear 435b and second bevel gear 422c), spur gear transmission (third spur gear 435a and second spur gear 434b), and rack and pinion meshing (first spur gear 434a and the sawtooth 34 of push rod 30), the total transmission ratio reaches 1600, and the maximum thrust can reach 1500N. The maximum thrust is increased by 120% compared to the 2000-3000N of traditional products, and it can extrude 800,000cps of high-viscosity hose 200.

[0083] like Figure 15 As shown, in the closed state, one end of the stop 424 is inserted into the groove 423a, so that the internal gear ring 423 is relatively fixed to the transmission housing 421. That is, when the shift button 425 is not pressed, under the force of the first elastic element 426, one end of the stop 424 is inserted into the groove 423a of the internal gear ring 423. When the push rod 30 is pulled to the left, it is difficult to pull the push rod 30 because the transmission ratio is designed to be above 1600 to transmit to the drive motor 41. Figure 16As shown, in the disengaged state, one end of the stop 424 disengages from the groove 423a, allowing the internal gear ring 423 to rotate relative to the transmission housing 421. That is, when the dial 425 is pressed, the dial 425 needs to overcome the force of the second elastic element 427. Through the structure of the two inclined surfaces 425a, it acts on the arc surfaces on both sides of the stop 424, pushing the stop 424 to overcome the force of the first elastic element 426, so that the stop 424 and the internal gear ring 423 are completely disengaged, realizing the disengagement action. At this time, the push rod 30 is pulled to the left. Through the transmission of the small transmission ratio of the transmission mechanism 43, the internal gear ring 423 slips under the drive of the first planetary gear system 422, and the push rod 30 is pulled back. In addition, the clutch state of the transmission 42 is achieved by driving the stop block 424 through the toggle button 425. The control method is relatively simple, the clutch function is not prone to failure, the structure is simpler, and it is easier to process and manufacture. Moreover, the movement directions of the toggle button 425 and the stop block 424 are at an angle, so the toggle button 425 can be set on the side of the electric glue gun to reduce the overall size of the electric glue gun.

[0084] Figure 17 The electric glue gun in this utility model is along Figure 1 A schematic diagram of the cross-sectional structure at the EE point. Figure 18 This is a schematic diagram of the left side of the motor cover plate 80 in this utility model. Figure 19 yes Figure 1 A magnified structural diagram at point F. (See diagram below.) Figures 17-19 As shown and referenced Figures 1-16 In one embodiment, the electric glue gun includes a motor cover plate 80, which is disposed within the drive mechanism mounting cavity 102 of the glue gun main housing 10 and located between the motor cover plate 80 drive motor 41 and gearbox 42. The glue gun main housing 10 includes a front shell 10a and a rear shell 10b connected to each other. Figure 15 and Figure 16 A slot 103 is provided between the front housing 10a and the rear housing 10b to mate with the motor cover plate 80. Figure 19 The motor cover plate 80 has guide straight edges 81 extending along the front-rear direction of the glue gun main housing 10 on its upper and lower sides. A through hole 801 is provided in the center of the motor cover plate 80, which is used to mate with the output shaft of the drive mechanism 40. By providing guide straight edges 81 extending along the front-rear direction (width direction) of the glue gun main housing 10 on the upper and lower sides of the motor cover plate 80, and by providing a slot 103 between the front housing 10a and the rear housing 10b to mate with the motor cover plate 80, the mutual cooperation between the guide straight edges 81 and the slot 103 can provide guidance in the front-rear direction. No rotational fine-tuning is required, allowing for successful installation in one step. This positioning method offers high visibility and facilitates installation, making it even more convenient for drive mechanisms that cannot be rotated for adjustment.

[0085] Furthermore, the main housing 10 of the glue gun is provided with a positioning rib 13, which protrudes from the inner wall of the main housing 10 and forms a groove 103 with the inner wall of the main housing 10. The inner sidewalls of the front shell 10a and the rear shell 10b are both provided with positioning ribs 13, so that the positioning ribs 13 form a ring structure.

[0086] Furthermore, the motor cover plate 80 has arc-shaped edges 82 extending along the vertical direction of the glue gun main housing 10 on both the front and rear sides. The slot 103 has a straight structure in the area corresponding to the guide straight edge 81, and an arc-shaped structure in the area corresponding to the arc-shaped edge 82.

[0087] Furthermore, the motor cover plate 80 is provided with multiple reinforcing ribs 83, which are located at least on the guide straight edge 81, thereby increasing the strength of the motor cover plate 80. Optionally, the reinforcing ribs 83 are L-shaped, and there are four reinforcing ribs 83, which extend from the guide straight edge 81 toward the through hole 801.

[0088] Furthermore, the drive motor 41 is provided with a positioning rib (not shown in the figure), and the reinforcing rib 83 is provided with a positioning groove 831 near the through hole 801. The positioning groove 831 is an arc-shaped structure and is used to cooperate with the positioning rib on the drive motor 41, thereby facilitating the positioning and installation between the drive motor 41 and the motor cover plate 80.

[0089] Furthermore, the motor cover 80 is provided with a positioning hole 802, and the gearbox 42 is provided with a positioning pin 421a. Figure 7 The positioning hole 802 is used to mate with the positioning post 421a. During assembly, the gearbox 42 and the motor cover plate 80 are assembled first and then placed into the drive mechanism mounting cavity 102 of the glue gun main housing 10.

[0090] Figure 20 yes Figure 1 A magnified structural diagram of point G in the middle. Figure 21 This is one of the circuit structure diagrams of the electric glue gun in this utility model. Figure 22 This is the second schematic diagram of the circuit structure of the electric glue gun in this utility model. For example... Figures 20-22 As shown and referenced Figures 1-19 In one embodiment, the circuit board 50 is located at the bottom of the handle 12, and the plane of the circuit board 50 is perpendicular to the extension direction of the handle 12. The circuit board 50 is horizontally arranged, and the handle 12 extends vertically. The circuit board 50 integrates a control module 51, a drive circuit module 52, a power management module 53, a signal receiving module 54, and a potentiometer 55. A control switch 121 is provided at the upper end of the handle 12. Figure 1 and Figure 10The drive circuit module 52, power management module 53, and signal receiving module 54 are all electrically connected to the control module 51. The potentiometer 55 and control switch 121 are also electrically connected to the control module 51 via the signal receiving module 54. One side of the potentiometer 55 extends beyond the edge of the circuit board 50 and protrudes from the handle 12. The potentiometer 55 is used to send a speed signal, the control switch 121 is used to send a switching signal, the signal receiving module 54 is used to receive the control signal, and the control module 51 is used to process the control signal and send a corresponding drive signal to the drive circuit module 52. The potentiometer 55 can be a 6-speed potentiometer, thus achieving 6 speed settings for dispensing glue. By making the extension directions of the circuit board 50 and the handle 12 perpendicular to each other, and integrating the control module 51, drive circuit module 52, power management module 53, signal receiving module 54, and potentiometer 55 onto the circuit board 50, with one side of the potentiometer 55 extending beyond the edge of the circuit board 50 and protruding from the handle 12, the circuit structure of the electric glue gun is more compact, making efficient use of space and improving overall space utilization.

[0091] Furthermore, the potentiometer 55 is located on the left rear edge of the circuit board 50 and protrudes from the rear of the handle 12, while the drive circuit module 52 is located on the left front edge of the circuit board 50, thereby making the circuit structure layout more compact.

[0092] Furthermore, the control module 51 includes an MCU (Microcontroller Unit) 511. The MCU 511 and the drive circuit module 52 are spaced apart on the circuit board 50, meaning the MCU 511 and the drive circuit are laid out separately, effectively reducing signal interference and simplifying the arrangement of signal and power lines. Optionally, the control module 51 also includes an MCU auxiliary circuit module to assist the MCU 511 in signal processing. The accuracy error of the top indicator 33 of the push rod 30 is controlled within ±1mm. The MCU 511 compensates for push force fluctuations in real time through a current detection circuit, and with the limit switch mechanism 70 having a response time of less than 50ms, a ±1mm glue quantity control error is achieved.

[0093] Furthermore, the circuit board 50 is provided with a signal cable pad 561, located on the right rear edge of the circuit board 50. The control switch 121 is electrically connected to the signal cable pad 561 via a wire. Optionally, the circuit board 50 is provided with a power cable pad 562, located on the left front edge of the circuit board 50. The battery 60 is electrically connected to the power management module 53, and the battery 60 is electrically connected to the power cable pad 562 via a wire. By placing the signal cable pad 561 on the right rear edge of the circuit board 50 and the power cable pad 562 on the left front edge of the circuit board 50, more electronic components (such as resistors) can be placed in the middle area of ​​the circuit board 50, making the layout of the circuit board 50 more compact.

[0094] Furthermore, the push-button switch 71 is electrically connected to the signal receiving module 54 and used to detect the glue-free signal. The push-button switch 71 is electrically connected to the signal cable pad 561 via a wire. When the glue in the glue tube 200 is used up, the first end 31 of the push rod 30 extends into the gun barrel 20 to its maximum stroke. At this time, the push rod protrusion 37 can trigger the push-button switch 71 of the limit switch mechanism 70. The push-button switch 71 sends a signal to the MCU 511 through the signal receiving module 54, thereby controlling the drive mechanism 40 to stop driving the push rod 30 to move, realizing the glue-free automatic protection function.

[0095] Furthermore, the circuit board 50 is equipped with an electrolytic capacitor 57, and the handle 12 has a vertically extending central channel 122. Figure 1 and Figure 20 Electrolytic capacitor 57 is located on the left edge of circuit board 50. Electrolytic capacitor 57 extends in the vertical direction and is opposite to the central channel 122. That is, part of electrolytic capacitor 57 is placed in the central channel 122, thereby reducing the size of handle 12.

[0096] Furthermore, a light 58 is provided on the circuit board 50, located on the right edge of the circuit board 50. The right side of the potentiometer 55 extends beyond the edge of the circuit board 50 and protrudes from the right side of the handle 12. Thus, during the glue application process, the light 58 can illuminate the glue nozzle, facilitating glue application. By integrating the light 58 with the circuit board 50 into a single design, a separate light board is eliminated, reducing the manufacturing and installation steps of an independent light board. At the same time, it significantly reduces the manufacturing difficulty of centralized wiring on the circuit board 50, improves space utilization, and reduces costs.

[0097] Furthermore, the drive circuit module 52 includes a motor drive circuit and a current detection circuit. The motor drive circuit is electrically connected to the power management module 53, the current detection circuit, and the drive motor 41. The motor drive circuit is used to control the rotation of the drive motor 41, and the current detection circuit is used to detect the current of the motor drive circuit. Optionally, the circuit board 50 is also provided with a temperature detection module, which is connected to the motor drive circuit and used to detect the temperature of the motor drive circuit.

[0098] Furthermore, the power management module 53 includes a power signal control module and an LDO (low dropout linear regulator) module. The power signal control module is electrically connected to the LDO module, the battery 60, and the motor drive circuit, respectively. The LDO module is electrically connected to the control module 51. The battery 60 supplies power to the control module 51 after being stepped down by the LDO module. The power signal control module supplies power to the drive motor 41 through the motor drive circuit.

[0099] Furthermore, the signal receiving module 54 includes a battery signal module, a gear position signal module, a switch signal module, and a limit signal module. The battery 60 is electrically connected to the control module 51 through the battery signal module, thereby sending signals such as voltage, current, and remaining power to the control module 51. The potentiometer 55 is electrically connected to the control module 51 through the gear position signal module, thereby sending a gear position signal to the control module 51 to adjust the glue application speed. The control switch 121 is electrically connected to the control module 51 through the switch signal module, thereby sending a switch signal to the control module 51 to control whether glue application is performed. The push contact switch 71 is electrically connected to the control module 51 through the limit signal module, thereby sending a no-glue signal to the control module 51. When the push contact switch 71 sends a no-glue signal to the control module 51, the control module 51 controls the drive mechanism 40 to stop the drive push rod 30 from moving.

[0100] Furthermore, the circuit board 50 integrates a programming module connected to the control module 51. An external host computer (e.g., a computer) writes the program into the control module 51 through the programming module, thus establishing a communication link with the control module 51. This allows for both program programming and real-time acquisition and recording of the electric glue gun's operating data.

[0101] Optionally, a wireless control module, an intelligent monitoring module, or a Bluetooth module can also be installed on the circuit board 50 to meet higher-end market demands.

[0102] The circuit board 50 adopts a compact integrated design, highly integrating speed control, lighting, and programming modules: the speed control module uses an exposed 6-position potentiometer 55 to adjust the dispensing speed, and works with the MCU 511 for dynamic control to improve operational precision; the lighting module integrates LEDs 58 to provide high-brightness illumination for the nozzle area; the programming module supports program updates and work data recording, and operating parameters can be read by external devices. The circuit board 50 connects quickly to external components through standardized interfaces, ensuring functional integrity while reducing size, and reserving expansion interfaces to support future upgrades.

[0103] Figure 23 This is a plan view of the electric glue gun of this utility model. For ease of intuitive understanding, some of the external lines of the main housing 10 of the glue gun are hidden, and the following descriptions of direction are... Figure 23 The direction legend in the diagram is the standard. For example... Figure 23 As shown and referenced Figures 1-22 In one embodiment, the electric glue gun includes a main housing 10, a barrel 20 connected to the main housing 10, a drive mechanism 40 disposed within the main housing 10, and a push rod 30 driven by the drive mechanism 40. The barrel 20 is used to install a glue tube 200, the drive mechanism 40 is located behind the barrel, and the push rod 30 is used to squeeze the glue tube 200. The main housing 10 includes a handle 12 located below the drive mechanism 40 for the user to hold, and a battery 60 is disposed below the handle 12. The electric glue gun stands upright on a horizontal plane 202 via the battery 60; when the glue tube 200 is installed in the barrel 20, the center of gravity of the electric glue gun is located at a second center of gravity point X2; when the glue tube 200 is not installed in the barrel 20, the center of gravity of the electric glue gun is located at a first center of gravity point X1. The symmetrical center of the uppermost part of the handle 12 is set on the central line 203. The distance between the first center of gravity X1 and the central line 203 is no more than 10mm, and the distance between the second center of gravity X2 and the central line 203 is no more than 40mm. This setting, through dynamic center of gravity balance and structural optimization, achieves stable grip and upright placement. Specifically, when unloaded, the distance L1 of the first center of gravity X1 from the central line 203 is ≤10mm, and when loaded, the distance L2 of the second center of gravity from the central line 203 is ≤40mm, ensuring that the torque is minimized when gripping with one hand, reducing operational fatigue. Moreover, when the gun barrel 20 and the hose 200 are installed, the center of gravity of the electric glue gun shifts to the side of the gun barrel 20, forming a torque counteracting force with the squeezing reaction force of the push rod 30, avoiding the need for the wrist to exert extra force to maintain balance when gripping. Actual tests showed that wrist fatigue decreased by 60% after 2 hours of continuous operation.

[0104] The center line 203 is defined as the symmetrical central axis of the uppermost part of the handle 12, that is, the center line 203 is the perpendicular bisector of dimension L3. The uppermost area of ​​the handle 12 coincides with the main contact area between the user's thumb and forefinger when gripping. As the grip fulcrum, the distance between the center of gravity and the center line 203 directly determines the magnitude of the operating torque. When the first center of gravity X1 and the second center of gravity X2 are controlled within 10mm and 40mm from the center line 203, respectively, the torque balance during gripping can be ensured: when unloaded, the center of gravity is close to the fulcrum, and the torque is minimized; when loaded, the center of gravity is reasonably offset, forming a torque counteracting force with the reaction force of the push rod, avoiding extra force from the wrist. This design improves grip stability by 35% and significantly reduces fatigue during long-term operation by controlling the lever arm length.

[0105] Furthermore, both the first center of gravity X1 and the second center of gravity X2 are located on the front side of the central line 203 near the barrel 20, and the distance between the second center of gravity X2 and the central line 203 is greater than the distance between the first center of gravity X1 and the central line 203. When the glue tube 200 inside the barrel 20 is being squeezed, the center of gravity of the electric glue gun will shift from the second center of gravity X1 towards the first center of gravity X1, or the center of gravity of the electric glue gun will shift towards the central line 203. Actual measurements show that when the remaining glue tube volume decreases from 100% to 20%, the gripping torque fluctuation is only ±8%, significantly better than the ±35% fluctuation of traditional glue guns. In other embodiments, the first center of gravity X1 can be located behind the central line 203, and the second center of gravity X2 can be located in front of the central line 203. In other embodiments, the first center of gravity X1 can also coincide with the central line 203.

[0106] Furthermore, the barrel 20 extends along the first straight line 201, and the angle θ between the first straight line 201 and the horizontal plane 202" satisfies 0 < θ ≤ 3°. The barrel 20 is slightly tilted, causing the center of gravity of the hose 200 to shift 3-5 mm towards the drive mechanism 40, forming torque compensation with the rear weight of the battery 60, thus enhancing ergonomics. Furthermore, the extension direction of the push rod 30 is parallel to the direction of the first straight line 201.

[0107] Furthermore, a battery mounting portion 600 is provided at the lowest end of the handle 12, and the battery 60 is slidably mounted in the battery mounting portion 600, with the battery 60 exposed outside the battery mounting portion 600. When the electric glue gun is not equipped with the battery 60 and glue tube 200, it can stand upright on the horizontal plane 202' through the battery mounting portion 600. When the battery 60 and glue tube 200 are not installed, the electric glue gun stands upright on the horizontal plane 202 through the rectangular bottom surface of the battery mounting portion 600, which preferably adopts a dual-channel slide rail structure.

[0108] Furthermore, the projection points of the first center of gravity X1 and the second center of gravity X2 on the horizontal plane 202 both fall within the projection of the battery mounting part 600 on the horizontal plane 202. As the material decreases during the extrusion process of the glue tube 200, the linear offset of the center of gravity is no more than 30mm. During this process, the projection of the center of gravity always remains within the support range of the battery mounting part 600, and the electric glue gun can always remain upright on the horizontal plane 202 after the operation is completed.

[0109] Furthermore, the handle 12 extends vertically along the horizontal plane 202, and the distance L4 between the first center of gravity X1 and the second center of gravity X2 in the vertical direction is no greater than 13mm. Specifically, the first center of gravity X1 is located below and behind the second center of gravity X2. Because the vertical distance between the first center of gravity X1 and the second center of gravity X2 is short, the change in the center of gravity of the electric glue gun is within a controllable range throughout the entire use process, avoiding the loss of balance caused by large shifts in the center of gravity, and ensuring the stability of the electric glue gun in both no-load and loaded states.

[0110] Furthermore, the gun barrel 20 extends along the first straight line 201, and a control switch 121 is provided at the end of the handle 12 near the drive mechanism 40. One end of the control switch 121 protrudes from the handle 12 towards the side of the gun barrel 20. The control switch 121 is located between the first center of gravity X1 and the second center of gravity X2 in the direction along the first straight line 201. Regardless of how much glue tube 200 remains, when the user operates the control switch 121, the force applied by the hand and the center of gravity distribution of the glue gun can be coordinated with each other, greatly improving the stability and comfort of operation, and effectively reducing hand fatigue and glue application errors caused by imbalance of center of gravity and operating force.

[0111] Furthermore, the weight of the electric glue gun without the glue tube 200 and battery 60 is no more than 2.5 kg, and the weight of the glue tube 200 is no more than 600 g. In special working environments such as high altitudes and confined spaces, the advantages of the lightweight design of the electric glue gun are even more obvious. It not only reduces the labor intensity of users and reduces the safety risks caused by heavy loads, but also significantly improves work efficiency and meets the needs of various scenarios.

[0112] Furthermore, in the vertical direction perpendicular to the horizontal plane 202, the first center of gravity X1 and / or the second center of gravity X2 are located between the handle 12 and the drive mechanism 40.

[0113] Furthermore, the drive mechanism 40 includes a drive motor 41, a gearbox 42 connected to the drive motor 41, and a transmission mechanism 43 connected to the gearbox 42. The gearbox 42 includes multiple planetary gear trains. The drive motor 41 is connected to the transmission mechanism 43 through the planetary gear trains, and the transmission mechanism 43 drives the push rod 30 to move. The drive motor 41, gearbox 42, and transmission mechanism 43 are arranged sequentially along the axial direction of the drive motor 41, with the handle 12 located directly below the gearbox 42. The handle 12, used for holding the electric glue gun with one hand, allows the index finger to press the operation control switch 121 and the thumb to press the operation dial 425. The gun barrel 20 is located in front of the hand, the gearbox 42 and transmission mechanism 3 are located directly above the hand, and the second end 32 of the drive motor 41 and push rod 30 is located behind the hand. This layout concentrates the center of gravity of the electric glue gun near the hand grip area, allowing the user to distribute the force evenly on their hand during operation and control the electric glue gun flexibly and stably.

[0114] In this application, by intersecting the extension direction of the circuit board 50 with that of the handle 12, and integrating the control module 51, drive circuit module 52, power management module 53, signal receiving module 54 and potentiometer 55 on the circuit board, and with one side of the potentiometer 55 extending beyond the edge of the circuit board 50 and protruding from the handle 12, the circuit structure layout of the electric glue gun is made more compact, making reasonable use of space and improving the overall space utilization rate.

[0115] In this document, the directional terms such as up, down, left, right, front, and back are defined according to the position of the electric glue gun structure in the accompanying drawings and the relative positions of the structures, solely for the clarity and convenience of expressing the technical solution. It should be understood that the use of these directional terms should not limit the scope of protection claimed in this application. It should also be understood that the terms "first" and "second," etc., used herein are for distinction only and not for limiting the number or order.

[0116] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content without departing from the scope of the technical solution of the present utility model. These are equivalent embodiments with equivalent changes. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. An electric glue gun, comprising a glue gun main housing and a circuit board disposed within the glue gun main housing, the glue gun main housing having a handle, a battery mounting portion at the lowermost end of the handle, the circuit board being located within the battery mounting portion, the plane of the circuit board intersecting the extending direction of the handle, and a control switch being provided at the upper end of the handle, characterized in that: The circuit board integrates a control module, a drive circuit module, a power management module, a signal receiving module, and a potentiometer. The drive circuit module, the power management module, and the signal receiving module are all electrically connected to the control module. The potentiometer and the control switch are both electrically connected to the control module through the signal receiving module. One side of the potentiometer extends beyond the edge of the circuit board and protrudes from the battery mounting portion. The potentiometer emits a gear position signal, and the control switch emits a switch signal. The signal receiving module receives the gear position signal and the switch signal and emits a control signal. The control module receives and processes the control signal and emits a corresponding drive signal to the drive circuit module.

2. The electric glue gun according to claim 1, characterized in that: The control module includes an MCU, and there is a gap between the MCU and the drive circuit module in the area on the circuit board.

3. The electric glue gun according to claim 1, characterized in that: The handle has a vertically extending central channel inside, and an electrolytic capacitor is provided on the circuit board. The electrolytic capacitor extends vertically and is located within the central channel.

4. The electric glue gun according to claim 1, characterized in that: The circuit board is square, and the potentiometer is located on the left rear edge of the circuit board.

5. The electric glue gun according to claim 4, characterized in that: The circuit board is provided with signal cable pads, which are located on the right rear edge of the circuit board. The control switch is electrically connected to the signal cable pads via wires.

6. The electric glue gun according to claim 5, characterized in that: The glue gun's main housing is equipped with a push-button switch, which is electrically connected to the signal receiving module. The push-button switch is also electrically connected to the signal cable pads via wires.

7. The electric glue gun according to claim 4, characterized in that: The electric glue gun includes a battery detachably connected to the battery mounting part. The battery is electrically connected to the power management module. The circuit board is provided with a power cable pad, which is located on the left front edge of the circuit board. The battery is electrically connected to the power cable pad through a wire.

8. The electric glue gun according to claim 4, characterized in that: The circuit board is equipped with a light source, which is located on the right edge of the circuit board. The right side of the light source extends beyond the edge of the circuit board and protrudes from the battery mounting portion.

9. The electric glue gun according to any one of claims 1-8, characterized in that: The potentiometer is a rotary potentiometer, located on the left rear edge of the circuit board. The drive circuit module is located on the left front edge of the circuit board, and the control module is located on the right rear of the drive circuit module.

10. The electric glue gun according to any one of claims 1-8, characterized in that: The electric glue gun includes a barrel, a push rod, and a drive mechanism. One end of the barrel is connected to the main housing of the glue gun. The push rod is movably connected to the main housing of the glue gun. The push rod has a first end and a second end. The first end of the push rod extends into the barrel and can move inside the barrel. The second end is always exposed outside the main housing of the glue gun. The drive mechanism is electrically connected to the drive circuit module and drives the push rod to move.

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