Swing arm structure with resistance absorption

Abstract

The utility model relates to a kind of swing arm structure with resistance absorption, including arm body, second spring and sliding block, it is characterized by: the arm body is opened with sliding groove, the second spring and sliding block are placed in sliding groove, the second spring one end is abutted in sliding groove inner wall, the second spring other end is abutted on sliding block, second spring constitutes the reset mechanism of sliding block, the lower end of sliding block is formed sliding portion by outwardly projecting.When swing arm meets external resistance (such as clamping large object) in the process of pushing push rod, leading to push rod unable to continue to advance, sliding block can slide along sliding groove under the action of second spring, second spring is compressed, thereby absorbing part of resistance, avoid pushing force directly transmitted to motor, prevent motor from blocking, overcurrent or damage.Second spring as reset mechanism, after load is removed, sliding block can be automatically reset, so that the structure has good self-recovery ability, enhance the stability and practicality of system.

Description

Technical Field

[0001] This utility model relates to a swing arm structure with resistance absorption. Background Technology

[0002] In existing technologies, nail guns are widely used in industries such as woodworking, decoration, and manufacturing. Their structure typically includes a motor drive, a transmission mechanism, a push rod, and a clamping component. The motor drives a swing arm through a reduction gear, which in turn pushes the push rod to move back and forth, causing the clamping component to clamp or release the nail.

[0003] However, in actual use, the clamping components often encounter significant resistance when clamping large or complex-shaped objects, causing the swing arm to be unable to continue pushing the push rod forward. In this situation, the motor continues to output power, but due to the obstruction of the push rod and its limited movement, the motor is prone to stalling, resulting in an abnormal increase in current, which in turn causes overcurrent, overheating, and even damage to the motor, affecting the overall reliability and service life of the nail gun. Utility Model Content

[0004] The purpose of this invention is to provide a swing arm structure with resistance absorption that can achieve stress buffering by compressing the second spring through the sliding block when the swing arm is obstructed.

[0005] The purpose of this utility model is achieved as follows:

[0006] A swing arm structure with resistance absorption includes an arm body, a second spring, and a sliding block. The arm body has a sliding groove, the second spring and the sliding block are placed in the sliding groove, one end of the second spring abuts against the inner wall of the sliding groove, the other end of the second spring abuts against the sliding block, the second spring constitutes a reset mechanism for the sliding block, and the lower end of the sliding block extends outward to form a sliding part.

[0007] When the swing arm encounters external resistance (such as clamping a large object) during the push rod process, causing the push rod to be unable to continue moving forward, the sliding block can slide along the sliding groove under the action of the second spring. The second spring is compressed, thereby absorbing part of the resistance and preventing the thrust from being directly transmitted to the motor, thus preventing the motor from stalling, overcurrent, or being damaged.

[0008] This structure not only improves the reliability and safety of motor operation but also significantly extends the overall service life of the nail gun. Furthermore, the second spring, acting as a reset mechanism, automatically resets the sliding block after the load is released, giving the structure excellent self-recovery capabilities and enhancing the system's stability and practicality.

[0009] The objective of this utility model can also be achieved by the following technical measures:

[0010] Furthermore, a connection port for connecting the output shaft is opened on one side of the arm body, and the sliding groove is opened on the other side of the arm body.

[0011] A connection port for connecting the output shaft is provided on one side of the boom, which facilitates direct connection between the boom and the drive system (such as a motor or reduction gear) to achieve efficient power transmission. The sliding groove is located on the other side of the boom, which effectively separates the transmission structure and the resistance absorption structure, avoids interference, makes the mechanism layout more reasonable, is conducive to compact structure and installation and maintenance, and improves overall stability and operational reliability.

[0012] Furthermore, it also includes a cover and a bolt, the cover being disposed on the surface of the arm to cover the sliding groove, and the bolt passing through the cover to lock the arm.

[0013] By covering the sliding groove with a shield, foreign objects (such as dust, wood chips, or nail fragments) can be effectively prevented from entering the sliding groove, ensuring smooth sliding of the sliding blocks within the groove and maintaining the sensitivity and efficiency of the resistance absorption structure. Bolts securely lock the shield to the boom body, facilitating subsequent disassembly and maintenance, and improving maintenance convenience and service life.

[0014] The beneficial effects of this utility model are as follows:

[0015] In this invention, when the swing arm encounters external resistance (such as clamping a large object) during the pushing process of the push rod, causing the push rod to be unable to continue moving forward, the sliding block can slide along the sliding groove under the action of the second spring. The second spring is compressed, thereby absorbing part of the resistance, avoiding the thrust being directly transmitted to the motor, and preventing the motor from stalling, overcurrent, or being damaged.

[0016] This invention effectively prevents foreign objects (such as dust, wood chips, or nail fragments) from entering the sliding groove by setting a cover to cover the sliding groove, ensuring that the sliding block slides smoothly in the groove and maintaining the sensitivity and working efficiency of the resistance absorption structure. Attached Figure Description

[0017] Figure 1 This is a diagram of a nail gun.

[0018] Figure 2 This is a top view of a nail gun.

[0019] Figure 3 This is a schematic diagram of a nail gun (the push rod extends forward, the clamping component is in the clamping state, and the second spring is compressed).

[0020] Figure 4 This is a 3D view of a nail gun (the push rod extends forward, the clamping component is in the clamped state, and the second spring is compressed).

[0021] Figure 5 This is a schematic diagram of a nail gun (the push rod retracts backward, the clamping component opens, and the second spring returns to its original position).

[0022] Figure 6This is a 3D view of a nail gun (the push rod extends forward, the clamping component is in the clamped state, and the second spring is compressed).

[0023] Figure 7 This is a schematic diagram of the swing arm (the second spring is compressed).

[0024] Figure 8 This is a schematic diagram of the swing arm (with the second spring resetting).

[0025] Figure 9 A perspective view (excluding the housing) showing the connection of the drive unit, worm gear, and reduction gear.

[0026] Figure 10 A schematic diagram showing the connection of the drive unit, worm gear, and reduction gear (excluding the housing).

[0027] Figure 11 This is a cross-sectional view of the speed reduction device.

[0028] Figure 12 This is an exploded view of the drive unit, worm gear, and reduction gear.

[0029] Figure 13 for Figure 3 AA sectional view.

[0030] Figure 14 This is a schematic diagram illustrating how the rotation of the adjusting screw causes the lower and upper clutches to disengage.

[0031] Figure 15 This is a schematic diagram showing the separation of the upper and lower clutches.

[0032] Figure 16 A schematic diagram showing the connection between the lower and upper clutches, which is used to adjust the rotation of the screw and the reset of the first spring.

[0033] Figure 17 This is a schematic diagram showing the connection between the upper and lower clutches.

[0034] Figure 18 This is a diagram of a nail gun (with part of the gun body removed).

[0035] Figure 19 This is a schematic diagram showing the connection between the slider and the slide rail.

[0036] Figure 20 This is a schematic diagram showing the connection between the push rod, guide block, slider, and slide rail. Detailed Implementation

[0037] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0038] Implementation examples, in conjunction with Figures 1 to 20As shown, a nail gun includes a gun body 1, a drive device, a deceleration device 3, a clutch device 4, a swing arm 5, a push rod 6, and a clamping component 7. The clamping component 7 is located at the front of the gun body 1, and the drive device is located at the rear of the gun body 1.

[0039] The push rod 6 is slidably disposed inside the gun body 1. The front end of the push rod 6 is connected to the clamping component 7. The push rod 6 is provided with a guide block 8, and the guide block 8 has a guide groove 81.

[0040] The deceleration device 3 is located on one side of the gun body 1, the swing arm 5 is located on the other side of the gun body 1, and the output end of the drive device is connected to the input end of the deceleration device 3.

[0041] The clutch device 4 includes an upper clutch 41, a lower clutch and a controller 43. The lower clutch is connected to the output end of the deceleration device 3. The upper clutch 41 is connected to one end of the swing arm 5. The other end of the swing arm 5 is provided with a sliding part 51, which extends into the guide groove 81.

[0042] The controller 43 is mounted on the gun body 1, and the controller 43 controls the connection or disengagement of the upper clutch 41 and the lower clutch;

[0043] When the upper clutch 41 and the lower clutch are connected, the drive device reduces the speed through the reduction device 3 and then drives the swing arm 5 to rotate through the clutch device 4, causing the sliding part 51 to slide in the guide groove 81 and push the push rod 6 to slide back and forth, so that the push rod 6 drives the clamping part 7 to open or close.

[0044] Furthermore, the driving device includes a motor 2 and a worm gear 21. The motor 2 is arranged at the rear of the gun body 1 in an inclined manner. The output end of the motor 2 is connected to the worm gear 21, and the worm gear 21 meshes with the input end of the reduction device 3.

[0045] Furthermore, the tail end of the motor 2 is inclined upward toward the gun body 1, and the worm gear 21 is inclined downward toward the gun body 1.

[0046] Furthermore, the reduction device 3 includes a housing 31, a worm gear 32, a sun gear 33, a planetary gear 34, a centering wheel 35, and an output shaft 36. The worm gear 32 is a hollow ring body, with external teeth 321 on the outer wall and internal teeth 322 on the inner wall.

[0047] The worm gear 32 is rotatably disposed in the inner cavity of the housing 31, and the external teeth 321 mesh with the worm 21;

[0048] The housing 31 is mounted on the gun body 1. The housing 31 is provided with a positioning shaft 37 at intervals corresponding to the inner cavity of the worm gear 32. The diameter of the core wheel 35 is larger than the diameter of the planetary gear 34. The core wheel 35 is sleeved on the positioning shaft 37. The outer wall of the core wheel 35 is in close contact with the inner wall of the worm gear 32 and is located outside the internal teeth 322.

[0049] The planetary gear 34 is sleeved on the positioning shaft 37, and the planetary gear 34 rotates about the positioning shaft 37 as the rotation center. The planetary gear 34 meshes with the internal teeth 322.

[0050] The sun gear 33 is rotatably disposed in the inner cavity of the housing 31. The sun gear 33 meshes with the planetary gear 34. The output shaft 36 is connected to the sun gear 33. The worm gear 32 drives the output shaft 36 to rotate through the planetary gear 34 and the sun gear 33.

[0051] Furthermore, the housing 31 includes a first accommodating cavity 311 and a second accommodating cavity 312, which are connected.

[0052] The worm 21 is rotatably disposed in the second accommodating cavity 312, and the worm wheel 32 is rotatably disposed in the first accommodating cavity 311. Part of the external teeth 321 of the worm wheel 32 enter the second accommodating cavity 312 and mesh with the worm 21.

[0053] The bottom wall of the first accommodating cavity 311 is provided with the positioning shaft 37 at intervals corresponding to the inner cavity of the worm gear 32.

[0054] Furthermore, the controller 43 includes a movable plate 431, an adjusting bolt 432, a pressure block 433 and a first spring 434, the lower clutch is a splined lower clutch 42, the output shaft 36 is a splined shaft, and the splined shaft extends through the gun body 1 toward the upper clutch 41;

[0055] The splined sleeve lower clutch 42 is provided with a slot 421. The splined sleeve lower clutch 42 is sleeved on the splined shaft. The first spring 434 is sleeved on the splined shaft. One end of the first spring 434 abuts against the splined shaft, and the other end of the first spring 434 abuts against the splined sleeve lower clutch 42. The first spring 434 constitutes the reset mechanism of the splined sleeve lower clutch 42.

[0056] The movable plate 431 has a first through hole 4311. The movable plate 431 is movably mounted on the gun body 1. The end of the movable plate 431 is inserted into the slot 421 of the splined clutch 42.

[0057] The adjusting bolt 432 passes through the first through hole 4311 and connects to the gun body 1. The pressure block 433 is sleeved on the adjusting bolt 432. One end of the pressure block 433 abuts against the head of the adjusting bolt 432, and the other end of the pressure block 433 abuts against the movable plate 431. The adjustment bolt 432 rotates and drives the pressure block 433 to move, thereby driving the lower clutch 42 of the spline sleeve to move, so that the lower clutch 42 of the spline sleeve and the upper clutch 41 are connected or separated.

[0058] Furthermore, the swing arm 5 also includes an arm body 52, a second spring 53, and a sliding block 54. The arm body 52 has a sliding groove 521. The second spring 53 and the sliding block 54 are placed in the sliding groove 521. One end of the second spring 53 abuts against the inner wall of the sliding groove 521, and the other end of the second spring 53 abuts against the sliding block 54. The second spring 53 constitutes the reset mechanism of the sliding block 54. The lower end of the sliding block 54 extends outward to form the sliding part 51. The output end of the clutch device 4 is connected to the arm body 52.

[0059] Furthermore, one side of the arm body 52 has a connection port 522 for connecting the output shaft, and the other side of the arm body 52 has the sliding groove 521.

[0060] Furthermore, it also includes a cover 523 and a bolt 524. The cover 523 is disposed on the surface of the arm body 52 to cover the sliding groove 521, and the bolt 524 passes through the cover 523 to lock the arm body 52.

[0061] Furthermore, the guide groove 81 is a vertical guide groove, and the direction of the guide groove 81 is perpendicular to the moving direction of the push rod 6.

[0062] Furthermore, it also includes a guide device 9, which includes a slide rail 91 and a slider 92. The slide rail 91 is disposed on the gun body 1, and the slider 92 sits on the slide rail 91 in a sliding manner. The slider 92 is connected to the guide block 8.

[0063] Furthermore, it also includes a tension wheel assembly 10. The clamping component 7 includes a first clamping member 71 and a second clamping member 72. The first clamping member 71 and the second clamping member 72 are respectively hinged to the gun body 1. The front part of the first clamping member 71 and the front part of the second clamping member 72 form a nail clamping opening 73. A nail pushing channel 74 is formed between the rear part of the first clamping member 71 and the rear part of the second clamping member 72. The nail pushing channel 74 and the nail clamping opening 73 are connected. The tension wheel assembly 10 is placed in the nail pushing channel 74 and connected to the push rod 6.

[0064] Furthermore, it also includes an automatic nail feeding device 20. The gun body 1 has a nail inlet at the position corresponding to the nail pushing channel 74. The automatic nail feeding device 20 is installed on the gun body 1, and the nail feeding outlet of the automatic nail feeding device 20 is connected to the nail inlet.

[0065] Nail gun working principle

[0066] When the motor 2 drives the worm 21 to rotate, the worm 21 meshes with the worm wheel 32 in the reduction gear 3, and is further reduced in speed by the planetary gear 34 and the sun gear 33, and is connected to the swing arm 5 through the upper clutch 41 and the lower clutch. When the swing arm 5 rotates, the sliding block 54 at its lower end slides up and down in the vertical guide groove of the guide block 8. This vertical motion is converted into a horizontal thrust by the guide block 8, which pushes the push rod 6 back and forth, thereby driving the clamping component 7 at the front end to open and close, clamping or releasing the C-shaped nail bundle. At the moment of clamping open, the automatic nail feeding device 20 pushes the next nail into the channel to complete continuous nailing.

[0067] The reason for the small size of the nail gun

[0068] The motor 2 is installed at an angle at the rear of the gun body 1. The worm 21 directly meshes with the worm wheel 32, eliminating the horizontal and axial occupancy of traditional horizontal or multi-stage spur and helical gears. The reduction device 3 adopts a set of planetary and sun gears 33, and the worm 21 and worm wheel 32 are respectively placed in the double-connected cavity of the housing 31. This optimizes the three-dimensional spatial layout and compresses the radial and axial dimensions, realizing the miniaturization design of the nail gun.

[0069] The anti-jamming principle of the deceleration device 3

[0070] The diameter of the centering wheel 35 is larger than that of the planetary gear 34. The centering wheel 35 is in close contact with the inner wall of the worm gear 32 to achieve radial constraint on the planetary gear 34. The planetary gear 34 maintains a preset clearance with the internal gear and the sun gear 33, allowing thermal expansion and vibration to shift without changing the meshing clearance, thus avoiding jamming due to eccentricity or thermal expansion causing the tooth clearance to become smaller.

[0071] The reason why the nail gun is easy to repair via clutch device 4

[0072] Users can disengage or engage the clutch device 4 without additional tools by rotating the adjusting bolt 432 on the outside of the gun body 1. Once disengaged, the swing arm 5 and push rod 6 can be quickly removed for inspection or replacement without disassembling the reduction gear 3 or motor 2, greatly shortening maintenance time and making operation simpler and more intuitive.

[0073] The principle of preventing motor 2 from stalling

[0074] When the push rod 6 encounters resistance while moving forward, the sliding block 54 compresses the second spring 53, and the swing arm 5 continues to rotate instead of rigidly driving the push rod 6, thereby eliminating the overload torque and preventing the motor 2 from experiencing instantaneous overcurrent or overheating due to stall, thus achieving mechanical overload protection for the motor 2.

[0075] The principle of horizontal linear motion of the push rod 6.

[0076] The guide block 8 on the push rod 6 is connected to the slider 92. The slider 92 slides along the length of the slide rail 91, thereby ensuring that the push rod 6 moves only in a predetermined horizontal direction, eliminating side sway and jamming, and improving the accuracy and stability of linear motion.

Claims

1. A swing arm structure with resistance absorption, comprising an arm body, a second spring, and a sliding block, characterized in that: The arm has a sliding groove, the second spring and the sliding block are placed in the sliding groove, one end of the second spring abuts against the inner wall of the sliding groove, and the other end of the second spring abuts against the sliding block. The second spring constitutes the reset mechanism of the sliding block, and the lower end of the sliding block extends outward to form a sliding part.

2. The swing arm structure with resistance absorption according to claim 1, characterized in that: The arm has a connection port on one side for connecting the output shaft, and the sliding groove on the other side of the arm.

3. The swing arm structure with resistance absorption according to claim 1, characterized in that: It also includes a cover and bolts, the cover being disposed on the surface of the arm to cover the sliding groove, and the bolts passing through the cover to lock the arm.

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