Spring type nail gun

Abstract

The utility model discloses a spring type nail gun, which belongs to the technical field of electric tools and comprises a guide rod, a striking spring, a striking unit and a driving unit, the striking unit comprises a striking block and a firing pin, the driving unit comprises a motor and a lifting piece driven by the motor, a sleeve is further sleeved on the guide rod, a groove matched with the sleeve is arranged on the striking block, and the striking spring is arranged in the groove. The sleeve is provided with a limiting part and a base part which are distributed in the axial direction, the outer diameter D1 of the limiting part is smaller than the outer diameter D2 of the base part, the end of the striking spring is arranged on the periphery of the limiting part in a sleeving mode and abuts against the base part, the sleeve abuts against the interior of the groove through the striking spring, and the end of the striking spring is also located in the groove. The end of the striking spring is limited in two directions in the radial direction through the limiting part and the circumferential groove wall of the groove, the structural stability of the end of the striking spring is improved, and the situation that the end of the striking spring deforms after working for a long time is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric tool technical field especially, relates to a spring type nail gun. BACKGROUND

[0002] Nail gun is commonly used to drive a nail tool, and the existing spring type nail gun generally comprises a guide rod, a spring, a hitting block, a striker and a power structure, the spring is sleeved on the outside of the guide rod and is positioned at one end, the other end is in contact with the hitting block, the hitting block is slidably sleeved on the guide rod, the striker is connected to the hitting block, the power structure drives the hitting block and the striker to move towards the compressed spring, so that the spring is compressed to store energy. When the hitting block is released, the spring is released, and the compressed spring drives the hitting block and the striker to move along the guide rod towards the nail, and the striker moves quickly to drive the nail into the workpiece. In the existing spring type nail gun, one end of the spring directly contacts the hitting block, and since the inner diameter of the spring is greater than the outer diameter of the guide rod, the spring is prone to radial displacement, and the spring is prone to deformation after long-term work, which is not conducive to ensuring the structural stability and performance stability of the spring, thereby affecting the driving effect. SUMMARY

[0003] In order to solve the above-mentioned shortcomings and deficiencies in the prior art, the utility model provides a spring type nail gun, the end of the hitting spring is limited in two directions in the radial direction by the limiting part and the circumferential groove wall of the groove, the structural stability of the end of the hitting spring is improved, and the deformation of the end of the hitting spring after long-term work is avoided.

[0004] In order to achieve the above technical purpose, the utility model provides a spring type nail gun, which comprises:

[0005] a guide rod;

[0006] a hitting spring, which is sleeved on the outside of the guide rod;

[0007] a hitting unit, which comprises a hitting block slidably sleeved on the guide rod and a striker connected to the hitting block, and the compressed hitting spring drives the hitting unit to move in a predetermined driving direction to drive the fastener into the workpiece;

[0008] a driving unit, which comprises a motor and a lifting piece driven by the motor, and the lifting piece driven by the motor drives the hitting unit to move in a predetermined energy storage direction to compress the hitting spring, and the energy storage direction is opposite to the driving direction;

[0009] The guide rod is further sleeved with a sleeve, the hitting block is provided with a groove matched with the sleeve, the sleeve has an axial limiting portion and a base portion, the outer diameter D1 of the limiting portion is smaller than the outer diameter D2 of the base portion, the end of the hitting spring is sleeved with the outer periphery of the limiting portion and abuts against the base portion, the sleeve is abutted against the groove by the hitting spring and the end of the hitting spring is also located in the groove.

[0010] Preferably, the axial height H of the limiting portion is 7-15mm.

[0011] Preferably, the inner diameter of the groove is D3, the inner diameter of the hitting spring is d1, the outer diameter of the hitting spring is d2, D1 < d1 < d2 ≤ D2 ≤ D3.

[0012] Preferably, the base portion is provided with an elastic pad, and the end of the hitting spring abuts against the elastic pad.

[0013] Preferably, the hitting spring is provided with a thin spring and a thick spring sleeved in sequence, the limiting portion comprises a first limiting portion corresponding to the thin spring and a second limiting portion corresponding to the thick spring, the first limiting portion is thinner than the second limiting portion and a step surface is formed between the first limiting portion and the second limiting portion, the end of the thin spring is sleeved with the outer periphery of the first limiting portion and abuts against the step surface, and the end of the thick spring is sleeved with the outer periphery of the second limiting portion and abuts against the base portion.

[0014] Preferably, the step surface and the base portion are both provided with elastic pads.

[0015] Preferably, the thickness T of the elastic pad is 1-4mm.

[0016] Preferably, the groove is provided with at least one notch in the circumferential direction.

[0017] Preferably, the lifting member comprises a lifting wheel and a transmission pin arranged on the lifting wheel, the hitting block is provided with a transmission surface matched with the transmission pin, the rotating lifting wheel drives the hitting unit to move in the preset energy storage direction through the abutment of the transmission pin and the transmission surface, and the minimum distance L between the transmission surface and the central axis of the guide rod is greater than the radius of the hitting spring.

[0018] Preferably, the hitting block is provided with a thickened portion protruding towards the lifting wheel, and the transmission surface is arranged on the thickened portion.

[0019] After the above technical scheme is adopted, the utility model has the following advantages:

[0020] 1. The spring type nail gun provided by the utility model, a sleeve with a limiting portion and a base portion is additionally arranged on the guide rod, a groove is arranged on the hitting block, the end portion of the hitting spring is sleeved with the outer periphery of the limiting portion and abuts against the base portion, the sleeve is abutted against the groove by the hitting spring and the end portion of the hitting spring is also located in the groove, the end portion of the hitting spring is limited in two directions in the radial direction by the circumferential groove wall of the limiting portion and the groove, the structural stability of the end portion of the hitting spring is improved, the deformation of the end portion of the hitting spring after long time work is avoided, the performance stability of the hitting spring is ensured, the stability of the compressed hitting spring to the hitting unit when the hitting spring is released is ensured, and the nailing effect is ensured.

[0021] 2. The axial height H of the limiting portion is reasonably arranged, the weight of the sleeve is reasonably controlled while meeting the radial limiting requirement of the hitting spring. If the axial height H of the limiting portion is less than 7mm, the length of the hitting spring limited in the radial direction is small, which is not conducive to meeting the radial limiting requirement of the hitting spring by the limiting portion. If the axial height H of the limiting portion is greater than 15mm, the weight of the sleeve is large, which obviously increases the weight of the hitting unit, the speed of the compressed hitting spring driving the hitting unit to move in the nailing direction is slow, and the nailing effect is not conducive to being ensured.

[0022] 3. D1≤d1

[0023] 4. The elastic pad is arranged on the base portion, the end portion of the hitting spring abuts against the elastic pad, the hitting spring and the base portion can form one circle of effective contact in the circumferential direction through the elastic pad, the contact stability between the hitting spring and the sleeve is improved, the stability of the compressed hitting spring to the hitting unit when the hitting unit moves in the nailing direction is improved, and the nailing effect is conducive to being improved.

[0024] 5. The two hitting springs can be arranged at intervals inside and outside, the acting force of the compressed hitting spring to the hitting unit when the hitting unit moves in the nailing direction is increased, the moving speed of the hitting unit is improved, and the nailing effect is conducive to being improved. At this time, the sleeve is provided with a first limiting portion and a second limiting portion, the end portion of the thin spring is sleeved with the outer periphery of the first limiting portion and abuts against the step surface, and the end portion of the thick spring is sleeved with the outer periphery of the second limiting portion and abuts against the base portion. The specific structure of the sleeve is reasonably arranged according to the structure of the hitting spring, so that the end portion of the thin spring and the end portion of the thick spring can be limited in the radial direction.

[0025] 6. The groove is provided with at least one notch in the circumferential direction, the groove adopts a circumferential opening structure through the notch, the thickness of the hitting block can be appropriately reduced, the weight of the hitting block is appropriately reduced, the speed of the hitting unit driven by the compressed hitting spring when the hitting unit moves in the nailing direction is improved, and the nailing effect is conducive to being improved.

[0026] 7. The lifting component includes a lifting wheel and a drive pin. The striking block has a transmission surface that mates with the drive pin. The lifting wheel is driven to rotate by a motor. As the lifting wheel rotates, the drive pin abuts against the transmission surface on the striking block. Through the interaction between the drive pin and the transmission surface, the striking unit moves along the energy storage direction. During this process, the striking spring is compressed. A well-designed structure of the lifting component allows the motor to drive the striking unit and striking spring to the energy storage state. The minimum distance L between the transmission surface and the central axis of the guide rod is greater than the radius of the striking spring. A well-designed distance between the transmission surface and the guide rod prevents the drive pin, which follows the lifting wheel, from colliding with the striking spring, ensuring the structural stability of the striking spring.

[0027] 8. The striking block is equipped with a thickened part, and the transmission surface is located on the thickened part. The specific structure of the striking block is reasonably designed so that while controlling the volume of the striking block, the transmission surface can maintain a sufficient distance from the striking spring, thereby preventing the transmission pin on the lifting wheel from colliding with the striking spring when the lifting wheel rotates. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the entire spring-loaded nail gun as shown in Example 1.

[0029] Figure 2 This is a partial structural diagram of the spring-loaded nail gun in Example 1;

[0030] Figure 3 This is an exploded view of part of the structure of the spring-loaded nail gun in Example 1;

[0031] Figure 4 This is an axial sectional view of a portion of the structure in the spring-loaded nail gun of Embodiment 1;

[0032] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0033] Figure 6 for Figure 5 Exploded views of relevant components;

[0034] Figure 7 The structure of the striking block in the spring-loaded nail gun of Example 1 Figure 1 ;

[0035] Figure 8 The structure of the striking block in the spring-loaded nail gun of Example 1 Figure 2 ;

[0036] Figure 9 This is a cross-sectional view of the striking block in the spring-loaded nail gun of Embodiment 1;

[0037] Figure 10FIG. 1 is a perspective view of a spring-type nail gun according to an embodiment of the present application;

[0038] Figure 11 FIG. 4 is a cross-sectional view of a guide body in the spring-type nail gun according to the embodiment of the present application;

[0039] Figure 12 FIG. 5 is an exploded view of an adjustment unit in the spring-type nail gun according to the embodiment of the present application;

[0040] Figure 13 FIG. 6 is a perspective view of a sleeve body in the spring-type nail gun according to the embodiment of the present application;

[0041] Figure 14 FIG. 7 is a perspective view of a spring and a striker in the spring-type nail gun according to the embodiment of the present application.

[0042] In the drawings, 10 denotes a spring-type nail gun,

[0043] 110 denotes a guide rod, 120 denotes a striking spring, 121 denotes a thin spring, 122 denotes a thick spring,

[0044] 200 denotes a striking unit, 210 denotes a striker, 211 denotes a groove, 212 denotes a shaft hole, 213 denotes a notch, 214 denotes a transmission surface, 215 denotes an escape groove, 216 denotes a thickened portion, 220 denotes a striker pin, 230 denotes a sleeve, 231 denotes a limiting portion, 231a denotes a first limiting portion, 231b denotes a second limiting portion, 232 denotes a base, 233 denotes a stepped surface, 240 denotes an elastic pad,

[0045] 300 denotes a driving unit, 310 denotes a motor, 320 denotes a lifting member, 321 denotes a lifting wheel, 322 denotes a transmission pin, 323 denotes a pin, 330 denotes a speed reduction structure, 331 denotes an output shaft,

[0046] 400 denotes a housing, 410 denotes a main body portion, 420 denotes a handle portion, 430 denotes a receiving portion,

[0047] 500 denotes a battery pack,

[0048] 610 denotes a trigger, 620 denotes a start-stop switch, 630 denotes a swing lever,

[0049] 710 denotes a guide unit, 711 denotes a guide seat, 712 denotes a guide cover, 713 denotes a guide opening, 714 denotes a striking passage, 715 denotes a front cover, 716 denotes a limiting passage,

[0050] 720 denotes a nail feeding unit,

[0051] 730 denotes a safety trigger unit, 731 denotes a safety switch, 732 denotes a jacking rod, 733 denotes a jacking pin, 734 denotes a positioning member,

[0052] 800 - adjustment unit, 810 - inner sleeve body, 811 - protrusion, 812 - positioning plate, 813 - ratchet surface, 820 - outer sleeve body, 821 - protrusion, 830 - rotating cap, 840 - adjustment spring. DETAILED DESCRIPTION

[0053] The utility model will be further described below in combination with the drawings and specific embodiments. It should be understood that the following "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "vertical", "horizontal", "top", "bottom" and other words indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the indicated device / element must have a particular orientation or be constructed and operated in a particular orientation, so it cannot be understood as a limitation on the utility model.

[0054] Embodiment One

[0055] In combination Figures 1 to 13 , the spring type nail gun 10 provided by the embodiment one of the utility model comprises:

[0056] a guide rod 110;

[0057] a striking spring 120, which is arranged around the outside of the guide rod 110;

[0058] a striking unit 200, which comprises a striking block 210 slidably arranged on the guide rod 110 and a striker 220 connected to the striking block 210, and the striking spring 120 in compression drives the striking unit 200 to move along a preset nail driving direction (M1) to drive the fastener into the workpiece;

[0059] a driving unit 300, which comprises a motor 310 and a lifting piece 320 driven by the motor 310, and the lifting piece 320 driven by the motor 310 drives the striking unit 200 to move along a preset energy storage direction (M2) so that the striking spring 120 is compressed, and the energy storage direction (M2) is opposite to the nail driving direction (M1);

[0060] The guide rod 110 is further sleeved with a sleeve 230, the striking block 210 is provided with a groove 211 matched with the sleeve 230, the sleeve 230 has an axial limiting portion 231 and a base portion 232, the outer diameter D1 of the limiting portion 231 is smaller than the outer diameter D2 of the base portion 232, the end portion of the sleeve 230 is sleeved with the outer periphery of the limiting portion 231 and abuts against the base portion 232, the sleeve 230 is abutted against the groove 211 by the striking spring 120, and the end portion of the striking spring 120 is also located in the groove 211.

[0061] The end of the hitting spring 120 is limited in two directions in the radial direction by the limiting portion 231 and the circumferential groove wall of the groove 211, the structural stability of the end of the hitting spring 120 is improved, the deformation of the end of the hitting spring 120 after long-time work is avoided, the performance stability of the hitting spring 120 is ensured, the stability of the action of the compressed hitting spring 120 on the hitting unit 200 when released is ensured, and then the effect of nailing is ensured.

[0062] In combination Figure 1 In this embodiment, the spring-type nail gun 10 is provided with a machine shell 400, the machine shell 400 has a main body portion 410, a handle portion 420 and a receiving portion 430, the main body portion 410 extends in the vertical direction, the handle portion 420 and the receiving portion 430 both extend in the front-back direction, and the front end of the handle portion 420 and the front end of the receiving portion 430 are connected with the main body portion 410. The guide rod 110, the hitting spring 120 and the hitting unit 200 are arranged in the main body portion 410, the handle portion 420 is used for the operator to hold, and the driving unit 300 is arranged in the receiving portion 430. As a feasible scheme of this embodiment, the spring-type nail gun 10 can be powered by a battery pack 500, and the battery pack 500 is detachably mounted at the rear end of the handle portion 420. Of course, the spring-type nail gun 10 can also be powered by a power cord connected to a power supply.

[0063] In combination Figure 2 , Figure 3 In this embodiment, one guide rod 110 and one hitting spring 120 are arranged, the guide rod 110 is axially positioned in the main body portion 410, the inner diameter of the hitting spring 120 is greater than the outer diameter of the guide rod 110 so that the hitting spring 120 can be arranged around the guide rod 110, the top end of the hitting spring 120 is positioned, and the axial directions of the guide rod 110 and the hitting spring 120 are arranged in the vertical direction. As a feasible scheme of this embodiment, the diameter difference between the guide rod 110 and the hitting spring 120 can be set to 4mm, 5mm, 6mm, 7mm, 8mm or other reasonable sizes.

[0064] In combination Figure 7 , Figure 8 , Figure 9 The hitting block 210 is provided with a shaft hole 212 matched with the guide rod 110, the groove 211 is arranged on the top side of the hitting block 210 and communicates with the shaft hole 212, and the hitting block 210 is arranged around the guide rod 110 and located at the bottom of the hitting spring 120 through the cooperation of the shaft hole 212 and the guide rod 110. The sleeve 230 is arranged in a manner that the upper part is thinner and the lower part is thicker, the upper part of the sleeve 230 is the limiting portion 231, and the lower part is the base portion 232. In combination Figure 5 , Figure 6, the inner diameter of the groove 211 is D3, the inner diameter of the hitting spring 120 is d1, the outer diameter of the hitting spring 120 is d2, D1 < d1 < d2 ≤ D2 ≤ D3. The radial size relationship of the sleeve 230, the hitting spring 120 and the groove 211 is reasonably set, so that the end of the hitting spring 120 can be stably located between the outer circumferential surface of the limiting portion 231 and the groove wall of the groove 211 in the compressed state or the relaxed state. Specifically, d1-D1 can be set to 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, etc. reasonable size, D2-d2 can be set to 0, 0.1mm, 0.3mm, 0.5mm, 0.7mm, 1mm, etc. reasonable size, D3-D2 can be set to 0, 0.1mm, 0.3mm, 0.5mm, 0.7mm, 1mm, etc. reasonable size.

[0065] In order to ensure the limiting effect of the sleeve 230 on the hitting spring 120, the axial height H of the limiting portion 231 needs to be reasonably set to meet the radial limiting requirement of the hitting spring 120 while reasonably controlling the weight of the sleeve 230. In the present embodiment, the axial height H of the limiting portion 231 is 7mm-15mm. Specifically, the axial height H of the limiting portion 231 is preferably set to 10mm. In addition, in the present embodiment, the top surface of the hitting block 210 can be flush with or lower than the top surface of the sleeve 230. As an alternative to the present embodiment, the axial height H of the limiting portion 231 can also be set to 7mm, 8mm, 9mm, 11mm, 12mm, 13mm, 14mm, 15mm, etc. other reasonable size. As a feasible solution of the present embodiment, the sleeve 230 can be made of metal materials such as stainless steel.

[0066] In the present embodiment, the base portion 232 is provided with an elastic pad 240, the elastic pad 240 is sleeved on the outer circumference of the limiting portion 231, the end of the hitting spring 120 abuts against the elastic pad 240 and abuts the elastic pad 240 on the base portion 232. The hitting spring 120 and the base portion 232 can form an effective contact in the circumferential direction through the elastic pad 240, improve the contact stability between the hitting spring 120 and the sleeve 230, thereby improving the stability when the compressed hitting spring 120 applies force to the hitting unit 200 to move the hitting unit 200 in the direction of driving the nail (M1), which is beneficial to improve the driving effect. In the present embodiment, the outer diameter D5 of the elastic pad 240 is basically consistent with the outer diameter D2 of the base portion 232, and the thickness T of the elastic pad 240 is 1mm-4mm. In addition, the top surface of the hitting block 210 is higher than the top surface of the elastic pad 240, so that the lower end of the hitting spring 120 can be inserted into the groove 211. As a feasible solution of the present embodiment, the elastic pad 240 can be made of elastic materials such as silica gel or rubber. As a feasible solution of the present embodiment, the thickness T of the elastic pad can be set to 1mm, 2mm, 3mm, 4mm, etc. reasonable size

[0067] In combination Figure 7 In this embodiment, the groove 211 is provided with at least one notch 213 in the circumferential direction. Specifically, the front and rear sides of the groove 211 are provided with notches 213, which can reasonably reduce the thickness K of the hitting block 210 in the front-rear direction, thereby appropriately reducing the weight of the hitting block 210, and further improving the speed of the hitting unit 200 driven by the compressed hitting spring 120 when moving in the direction of driving nails (M1), which is conducive to improving the hitting effect.

[0068] In combination Figure 10 In this embodiment, the driving unit 300 further comprises a speed reduction structure 330, and the motor 310 drives the lifting piece 320 to rotate through the speed reduction structure 330. The speed reduction structure 330 can adopt a planetary gear speed reduction structure. Specifically, the lifting piece 320 comprises a lifting wheel 321 and a transmission pin 322 arranged on the lifting wheel 321. The lifting wheel 321 is sleeved on the output shaft 331 of the speed reduction structure 330. The axial direction of the output shaft 331 is perpendicular to the axial direction of the guide rod 110. The transmission pin 322 is provided with two transmission pins 322, which are distributed in the circumferential direction of the lifting wheel 321. At the same time, the distance between the two transmission pins 322 and the central axis N of the output shaft 331 is different. One of the transmission pins 322 is arranged close to the output shaft 331, and the other transmission pin 322 is arranged away from the output shaft 331.

[0069] In combination Figure 9The transmission face 214 is arranged on the hitting block 210 and cooperates with the transmission pin 322. When the lifting wheel 321 rotates, the transmission pin 322 on the lifting wheel 321 is in contact with the transmission face 214, and the transmission pin 322 drives the hitting unit 200 to move along the preset energy storage direction (M2) by the contact between the transmission pin 322 and the transmission face 214. The minimum distance L between the transmission face 214 and the central axis J of the guide rod 110 is greater than the radius of the hitting spring 120, so that the transmission pin 322 following the movement of the lifting wheel 321 does not collide with the hitting spring 120, and the structural stability of the hitting spring 120 is ensured. Specifically, the shaft hole 212 is arranged to the left of the hitting block 210, the right side of the hitting block 210 is provided with a thickened portion 216 protruding towards the lifting wheel 321, the thickened portion 216 is provided with an avoiding groove 215 on the side facing the lifting wheel 321, the top wall of the avoiding groove 215 and the bottom surface of the thickened portion 216 form the transmission face 214, the central axis J of the guide rod 110 is substantially coincided with the central axis of the shaft hole 212, and the distance between the bottom surface of the avoiding groove 215 parallel to the central axis J and the central axis J of the shaft hole 212 is L, L>0.5*d2. The transmission face 214 is arranged on the thickened portion 216, which controls the volume of the hitting block 210 and ensures that the transmission face 214 is far enough from the hitting spring 120, so that the transmission pin 322 on the lifting wheel 321 does not collide with the hitting spring 120 when the lifting wheel 321 rotates. As a feasible solution of the embodiment, L-d2 / 2 can be set to 1mm, 1.2mm, 1.5mm, 1.7mm, 2mm or other reasonable sizes.

[0070] When the motor 310 drives the lifting member 320 to rotate through the speed reduction structure 330, the two transmission pins 322 on the lifting wheel 321 are in contact with the corresponding transmission faces 214, respectively. The transmission pin 322 is in contact with the transmission face 214, and the transmission pin 322 drives the hitting unit 200 to move upward along the energy storage direction (M2) by the contact between the transmission pin 322 and the transmission face 214, so that the hitting spring 120 is compressed in the process, and the energy storage of the hitting spring 120 is realized. When driving the nail, the transmission pin 322 is separated from the transmission face 214, and the hitting spring 120 is released. The hitting spring 120 which restores the deformation drives the hitting unit 200 to move downward along the driving direction (M1) at a high speed, and the downward moving striker 220 drives the output nail into the workpiece.

[0071] In the embodiment, the bottom side of the front end of the handle portion 420 is provided with a trigger 610 for starting the driving nail program, and the front end of the handle portion 420 is internally provided with a start-stop switch 620 corresponding to the trigger 610. The start-stop switch 620 is in an off state in a normal state. The trigger 610 is provided with a swingable swing rod 630 and a torsional spring acting on the swing rod 630. The lifting wheel 321 is provided with a pin 323 cooperating with the swing rod 630 to keep the start-stop switch 620 in an on state during the driving nail period, so that the operator does not need to press the trigger 610 all the time during the driving nail period.

[0072] The spring-type nail gun 10 of the present embodiment further comprises a guide unit 710 and a nail feeding unit 720, wherein the guide unit 710 is arranged at the bottom of the main body part 410, and the nail feeding unit 720 is detachably mounted on the casing 400. When the nail feeding unit 720 is mounted on the casing 400, the front end of the nail feeding unit 720 is connected with the guide unit 710, and the rear end of the nail feeding unit 720 is connected with the accommodating part 430 of the casing 400. In combination Figure 3 、 Figure 11 In the present embodiment, the guide unit 710 comprises a fixed guide seat 711 and a guide cover 712 fixed at the front side of the guide seat 711, the guide seat 711 is provided with a guide opening 713 in communication with the nail feeding channel of the nail feeding unit 720, and a striking channel 714 in communication with the guide opening 713 is formed between the guide seat 711 and the guide cover 712, the striking channel 714 extends along the up-down direction and defines a striking direction (M1) and an energy storage direction (M2), and a part of the striker 220 extends into the striking channel 714. The nail feeding unit 720 feeds the fastener into the striking channel 714 through the guide opening 713, the striker unit 200 driven by the striking spring 120 to move downward strikes the fastener out of the striking channel 714, and the struck fastener is nailed into the workpiece. The specific structure of the nail feeding unit 720 can refer to the prior art, which will not be described here.

[0073] In order to improve the safety of nailing, the spring-type nail gun 10 of the present embodiment is further provided with a safety trigger unit 730. Specifically, the safety trigger unit 730 comprises a safety switch 731, a top rod 732, a safety spring (not shown in the figure), and a top pin 733. The safety switch 731 is fixed in the main body portion 410 of the casing 400 and is in an off state in the normal state. The top rod 732 is movably arranged in the main body portion 410 and is located below the safety switch 731. The upper end of the safety spring is positioned and the lower end is in contact with the top rod 732. The safety spring biases the top rod 732 downward so that the top rod 732 releases the safety switch 731 in the normal state. The front side of the guide cover 712 is provided with a front cover 715, and a limiting passage 716 extending in the upward and downward directions is formed between the front cover 715 and the guide cover 712. The top pin 733 is partially located in the limiting passage 716 and is movable upward and downward. The upper end of the top pin 733 extends out of the limiting passage 716 and can be in contact with the top rod 732. The lower end of the top pin 733 extends out of the limiting passage 716 and can be in contact with the workpiece. The stroke of the upward and downward movement of the top pin 733 is limited. Further, the lower end of the top pin 733 is fixed with a positioning member 734. When nailing, the positioning member 734 is in contact with the workpiece, and the top pin 733 moves upward under the contact of the positioning member 734 and the workpiece. The upward moving top pin 733 drives the top rod 732 to move upward against the bias of the safety spring. The upward moving top rod 732 acts on the safety switch 731 to switch the safety switch 731 from the off state to the on state. Only when both the safety switch 731 and the start-stop switch 620 are on, the spring-type nail gun 10 can be successfully started to perform the nailing action. The present embodiment does not limit the on sequence of the safety switch 731 and the start-stop switch 620. When the positioning member 734 is separated from the workpiece, the safety spring that restores the deformation makes the top rod 732 and the top pin 733 move downward. The downward moving top rod 732 releases the safety switch 731, and the safety switch 731 switches from the on state to the off state.

[0074] In combination Figure 12To adjust the nailing depth, the spring-loaded nail gun 10 of this embodiment is also provided with an adjustment unit 800 for adjusting the axial height of the guide rod 110. Specifically, the adjustment unit 800 includes an inner sleeve 810, an outer sleeve 820, a rotating cap 830, and an adjustment spring 840. The inner sleeve 810 is fixed to the upper end of the guide rod 110, and the upper end of the striking spring 120 extends into the inner sleeve 810 and abuts against the positioning plate 812 inside the inner sleeve 810. The adjustment spring 840 is located on the outer periphery of the inner sleeve 810 and is in a compressed state. The upper end of the adjustment spring 840 abuts against the protrusion 811 on the outer peripheral wall of the inner sleeve 810, and the lower end abuts against the inner wall of the main body 410 to achieve positioning. The adjustment spring 840 biases the inner sleeve 810 upward. The outer sleeve 820 is fitted over the inner sleeve 810 and axially positioned within the upper end of the main body 410. The screw cap 830 is fitted over the upper end of the outer sleeve 820 and located at the top of the main body 410. The top surface of the inner sleeve 810 has a series of ratchet surfaces 813 at different heights, which, in conjunction with... Figure 13 The inner wall of the outer sleeve 820 is provided with a raised rib 821 that can abut against one of the ratchet surfaces 813. When the outer sleeve 820 is turned by the screw cap 830, the raised rib 821 on the outer sleeve 820 abuts against the ratchet surface 813, allowing the inner sleeve 810 to move downward against the bias pressure of the adjusting spring 840. When the turning is finished, the adjusting spring 840, which has recovered its deformation, biases the inner sleeve 810 upward, causing a certain ratchet surface 813 to abut against the raised rib 821. Through the abutment between the ratchet surface 813 and the raised rib 821, the inner sleeve 810 and the guide rod 110 can be axially positioned and held at a certain height. The specific height position of the upper end of the striking spring 120 can be adjusted by the adjustment unit 800. Since the distance that the striking unit 200 moves upward along the energy storage direction (M2) under the drive of the lifting wheel 321 is constant, the axial length of the striking spring 120 after being compressed and storing energy can be adjusted by the adjustment unit 800. The striking spring 120 compressed to different axial lengths applies different forces to the striking unit 200. The speed at which the striking unit 200 moves downward along the nail driving direction (M1) is determined by the force applied by the striking spring 120.

[0075] When nailing, the transmission pin 322 disengages from the transmission surface 214, and the compressed striking spring 120 drives the striking unit 200 to move downward along the nailing direction (M1). The downward-moving striking unit 200 drives the fastener in the striking channel 714 into the workpiece.

[0076] After the impact ends, the drive unit 300 drives the impact unit 200 to move along the energy storage direction (M2) through the contact and cooperation between the transmission pin 322 and the transmission surface 214. The upward movement of the impact unit 200 causes the impact spring 120 to be compressed to complete the energy storage.

[0077] It can be understood that the spring type nail gun 10 can stop at a high position where the striking spring 120 is compressed or at a low position where the striking spring 120 is released when starting.

[0078] It can be understood that the fastener driven into the workpiece by the striking unit 200 can be a straight nail, a U-shaped nail, etc.

[0079] It can be understood that the guide rod 110 can also be arranged in two left and right intervals, and the corresponding striking spring 120 is also arranged in two left and right intervals and is respectively sleeved on the two guide rods 110. At this time, the striking block 210 is arranged one and simultaneously sleeved on the two guide rods 110, the striking block 210 is provided with two grooves 211, the two guide rods 110 are each sleeved with a sleeve 230, the base 232 of the sleeve 230 is provided with an elastic pad 240, and the lower ends of the two striking springs 120 are respectively abutted on the two elastic pads 240 and the two sleeves 230 are respectively abutted in the two grooves 211.

[0080] Embodiment two

[0081] In combination Figure 14 In this embodiment, the striking spring 120 is provided with a thin spring 121 and a thick spring 122 which are sleeved in an inner-outer interval, the limiting portion 231 includes a first limiting portion 231a corresponding to the thin spring 121 and a second limiting portion 231b corresponding to the thick spring 122, the first limiting portion 231a is thinner than the second limiting portion 231b and a stepped surface 233 is formed between the two, the lower end of the thin spring 121 is sleeved on the outer periphery of the first limiting portion 231a and abuts against the stepped surface 233, and the lower end of the thick spring 122 is sleeved on the outer periphery of the second limiting portion 231b and abuts against the base 232. Preferably, the stepped surface 233 and the base 232 are each provided with an elastic pad 240, the lower end of the thin spring 121 abuts on the elastic pad 240 at the stepped surface 233, and the lower end of the thick spring 122 abuts on the elastic pad 240 at the base 232. The axial height H1 of the first limiting portion 231a can be set to 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, etc. The axial height H2 of the second limiting portion 231b can be set to 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, etc. The axial height H2 of the second limiting portion 231b is preferably less than the axial height H1 of the first limiting portion 231a. In addition, the thickness of the elastic pad 240 can be set to 1mm, 2mm, 3mm, 4mm, etc.

[0082] In the embodiment, the inner diameter of the thick spring 122 is larger than the outer diameter of the thin spring 121, so as to avoid the mutual contact between the thick spring 122 and the thin spring 121. In addition, the inner diameter of the thin spring 121 is slightly larger than the outer diameter of the first limiting portion 231a, the inner diameter of the thick spring 122 is slightly larger than the outer diameter of the second limiting portion 231b and is equal to or less than the outer diameter of the base portion 232, and the lower end portion of the thick spring 122 extends into the groove 211. The top surface of the hitting block 210 can be arranged flush with the top surface of the sleeve 230, or can be arranged between the top surface of the sleeve 230 and the top surface of the upper elastic pad 240, and the lower end portion of the thick spring 122 is located between the outer peripheral surface of the second limiting portion 231b and the inner peripheral surface of the groove 211.

[0083] In the embodiment, the spiral directions of the thin spring 121 and the thick spring 122 are preferably arranged in opposite directions.

[0084] The other structures of the second embodiment are the same as those of the first embodiment, and will not be described here.

[0085] In addition to the preferred embodiments, the utility model also has other implementation manners, and those skilled in the art can make various changes and deformation according to the utility model, as long as the changes and deformation do not deviate from the spirit of the utility model, and all should belong to the range defined in the claims of the utility model.

Claims

1. A spring-type nail gun, comprising: a guide rod; a striking spring, which is sleeved on the outside of the guide rod; a striking unit, which comprises a striking block slidably sleeved on the guide rod and a hammer connected to the striking block, and the striking unit is driven by the compressed striking spring to move in a preset nail-driving direction to drive a fastener into a workpiece; a driving unit, which comprises a motor and a lifting piece driven by the motor, and the lifting piece driven by the motor drives the striking unit to move in a preset energy-storing direction to compress the striking spring, the energy-storing direction being opposite to the nail-driving direction; characterized in that a sleeve is further sleeved on the guide rod, a groove is arranged on the striking block and cooperates with the sleeve, the sleeve has an axial limiting portion and a base portion, the outer diameter D1 of the limiting portion is smaller than the outer diameter D2 of the base portion, the end of the striking spring is sleeved on the outer periphery of the limiting portion and abuts against the base portion, the sleeve is abutted in the groove by the striking spring and the end of the striking spring is also located in the groove.

2. The spring ram gun according to claim 1, wherein, The axial height H of the limiting portion is 7-15 mm.

3. The spring ram gun of claim 1 wherein, The inner diameter of the groove is D3, the inner diameter of the striking spring is d1, and the outer diameter of the striking spring is d2, and D1 < d1 < d2 ≤ D2 ≤ D3.

4. The spring ram gun of claim 1 wherein, The base portion is provided with an elastic pad, and the end of the striking spring abuts against the elastic pad.

5. The spring ram gun of claim 1 wherein, The striking spring is provided with a thin spring and a thick spring which are sleeved at intervals, the limiting portion comprises a first limiting portion corresponding to the thin spring and a second limiting portion corresponding to the thick spring, the first limiting portion is thinner than the second limiting portion and a step surface is formed between the first limiting portion and the second limiting portion, the end of the thin spring is sleeved on the outer periphery of the first limiting portion and abuts against the step surface, and the end of the thick spring is sleeved on the outer periphery of the second limiting portion and abuts against the base portion.

6. The spring ram gun of claim 5 wherein, The step surface and the base portion are both provided with an elastic pad.

7. The spring ram gun according to claim 4 or 6, wherein The thickness T of the elastic pad is 1-4 mm.

8. The spring ram gun of claim 1 wherein, The groove is provided with at least one notch in the circumferential direction.

9. The spring ram gun of claim 1 wherein, The lifting piece comprises a lifting wheel and a transmission pin arranged on the lifting wheel, the striking block is provided with a transmission surface which cooperates with the transmission pin, the rotating lifting wheel drives the striking unit to move in the preset energy-storing direction through the abutment of the transmission pin and the transmission surface, and the minimum distance L between the transmission surface and the central axis of the guide rod is greater than the radius of the striking spring.

10. The spring ram gun of claim 9 wherein, The striking block is provided with a thickened portion protruding towards the lifting wheel, and the transmission surface is arranged on the thickened portion.

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