CN117260629A - Pitch-variable type force supply mechanism and nail gun - Google Patents

Abstract

The utility model belongs to the technical field of fastening equipment, and relates to a variable-pitch type force supply mechanism and a nail gun. The nail gun of the present utility model has a driving device with a variable-pitch type force supply mechanism. The variable-pitch type force supply mechanism comprises a cylinder body, a rod seat, a nail shooting rod and a spring unit, wherein the spring unit is freely arranged between the rod seat and the rear side part and is provided with at least one variable-pitch spring which is abutted with the rod seat. Because the pitches of the parts in the pitch-variable spring are different, the elastic coefficients are different, so that the spring units generate different rebound forces in the rebound process after the nail shooting, different accelerations are formed at the parts, the parts can be mutually buffered, and the rebound acceleration is reduced, so that the rebound forces of the parts are offset. The impact force acting on the cylinder body is reduced, and the vibration reduction effect is realized.

Description

Pitch-variable type force supply mechanism and nail gun

Technical Field

The utility model belongs to the technical field of fastening equipment, and relates to a variable-pitch type force supply mechanism and a nail gun.

Background

At present, most of the existing nailing guns are pneumatic nailing guns, the pneumatic nailing guns need to supplement air pressure, auxiliary equipment such as an air compressor needs to be connected through special wires when in use, and the pneumatic nailing gun is easy to be constrained by the length of the wires and the auxiliary equipment during operation, so that the pneumatic nailing gun is not convenient enough.

The Chinese patent with the patent number 201921395877.X discloses a nailing gun, which comprises a gun body, a gun clip assembly and a nailing member, wherein the gun body comprises a power supply mechanism and a nailing gun nozzle, the gun clip assembly is arranged on the nailing gun nozzle, the inner end of the nailing member is inserted into the power supply mechanism, the outer end of the nailing member is arranged on the nailing gun nozzle, a driving mechanism is further arranged on the gun body and comprises a driving motor, a driving wheel is rotatably arranged on the driving motor, a plurality of teeth are distributed on the driving wheel, and a plurality of tooth sockets matched with the teeth are formed on the nailing member.

The force supply mechanism comprises a guide cylinder and a driving spring, the driving motor enables the nailing member to move back to the nailing direction through the driving wheel, so that the driving spring is compressed, then, the driving wheel is separated from the nailing member, and the nailing member is ejected at a high speed under the action of the driving spring, so that nailing is realized. Compared with a pneumatic nailing gun, the pneumatic nailing gun does not need auxiliary equipment such as an air compressor and the like, and does not need an air pipe for connection, so that the structure of the nailing gun is greatly simplified, and the pneumatic nailing gun is convenient to carry and operate.

However, this type of nailer also has a general problem in that after the driving spring completes one shot, the driving spring has a large residual energy, and the driving spring can quickly rebound to the rear end of the guide cylinder, so that the nailer can play. After play, the drive spring will rebound back and forth between the nailing member and the guide barrel and will slowly decay, causing the nailer to vibrate for a period of time. The play and the vibration seriously influence the operation feeling of a user, and simultaneously increase the labor intensity of the user, so that the service life of the whole nail gun is further shortened.

Disclosure of Invention

In order to solve the problems, a variable-pitch type force supply mechanism and a nail gun are supplemented.

The utility model adopts the following technical scheme:

the utility model complements a variable-pitch force supply mechanism, which comprises: a cylinder disposed within the nail gun and having a front side and a rear side; the rod seat is movably arranged in the cylinder body and divides the cylinder body into a front side cavity and a rear side cavity; the nail shooting rod is fixedly combined with the rod seat and provided with a nail shooting end extending out of the front side part for shooting nails; and a spring unit which is freely arranged between the rod seat and the rear side part and is provided with at least one variable-pitch spring which is abutted against the rod seat.

The utility model can also be embodied in a torque-type power supply, wherein the torque spring has at least one torque-type section, the pitch of which increases or decreases gradually.

The utility model also provides a distance-varying force supply mechanism, which is characterized in that the distance-varying spring also comprises at least one equidistant section connected with the distance-varying section, and the pitches of the equidistant sections are the same.

The distance-variable force supply mechanism added by the utility model can also be characterized in that the distance-variable spring is provided with at least two equidistant sections with different pitches and a transition section connecting two adjacent equidistant sections, and the pitches of the same equidistant section are the same

The distance-varying force supply mechanism according to the utility model may also be characterized in that the spring unit has at least two distance-varying springs arranged in parallel and symmetrically distributed around the central extension line of the nail-shooting rod.

The utility model can also be embodied in a torque-variable force mechanism, wherein the spring unit comprises: at least two layers of spring parts are distributed along the moving direction of the rod seat; and the linkage piece is arranged between two adjacent layers of layer spring parts and is used for enabling the two layers of layer spring parts to be linked, and each layer spring part comprises at least one variable-pitch spring.

The distance-variable type force supply mechanism according to the present utility model may be characterized in that the layer spring portion provided near the front side portion is a front layer spring portion, the layer spring portion provided near the rear side portion is a rear layer spring portion, the front layer spring portion and the rear layer spring portion have different integrated elastic coefficients, and the front layer spring portion or the rear layer spring portion has at least two distance-variable springs arranged in parallel and symmetrically distributed around a center extension line of the nail-shooting rod; the linkage piece is provided with a plurality of mounting parts movably arranged on the guide rod and at least one guide rod part; one end of the rear layer spring part or the front layer spring part is installed on the guide rod part, and the other end is installed on the rear side part or the rod seat of the cylinder body.

The distance-changing type force supply mechanism supplemented by the utility model can be characterized in that a plurality of symmetrically arranged guide rods are arranged in the cylinder body, two ends of each guide rod are respectively fixed with the front side part and the rear side part, the rod seat is movably arranged on the guide rods, the spring units are provided with the distance-changing springs with the same number as the guide rods, and each distance-changing spring is respectively arranged on the corresponding guide rod.

The distance-variable force supply mechanism of the present utility model may be characterized in that the lever seat includes a front buffer member, and the rear side portion includes a rear buffer member for buffering vibration of the distance-variable spring.

The utility model complements a driving device which is arranged in a nail gun and is used for supplementing the power of a nail, and is characterized by comprising the following components: the variable-pitch type force supply mechanism is used for supplementing the power of the nail shooting; and the driving mechanism is used for driving the variable-pitch type force supply mechanism to generate power, wherein the force supply mechanism is the variable-pitch type force supply mechanism.

The utility model complements a nail gun, which is characterized by comprising: and the driving device is used for supplementing the power of the nail shooting, wherein the driving device is the driving device.

The actions and effects of the utility model

The nail gun has a driving device and the driving device is provided with a variable-distance type force supply mechanism. The variable-pitch type force supply mechanism comprises a cylinder body, a rod seat, a nail shooting rod and a spring unit, wherein the spring unit is freely arranged between the rod seat and the rear side part and is provided with at least one variable-pitch spring which is abutted with the rod seat.

Because the pitches of the parts in the pitch-variable spring are different, the elastic coefficients are different, so that the spring units generate different rebound forces in the rebound process after the nail shooting, different accelerations are formed at the parts, the parts can be mutually buffered, and the rebound acceleration is reduced, so that the rebound forces of the parts are offset. The impact force acting on the cylinder body is reduced, and the vibration reduction effect is realized. Meanwhile, the rebound acceleration is reduced, so that the vibration time of the spring unit is also reduced, the working stability of the nail gun is ensured, and the labor intensity of a user is reduced.

In addition, because the comprehensive elastic coefficients of the two layers of spring parts are different, the spring unit can rebound after shooting nails, and different accelerations caused by different rebound forces of the two layers of spring parts cause the two layers of spring parts to buffer each other, so that rebound acceleration is further reduced, and a part of rebound force is resisted.

Drawings

FIG. 1 is a schematic view of the nail gun of the present utility model;

FIG. 2 is a schematic view of the structure of the force supply mechanism, the driving mechanism and the gun nozzle of the present utility model;

FIG. 3 is a schematic view of the structure of the force supply mechanism and the gun nozzle of the present utility model;

FIG. 4 is a cross-sectional view of the drive mechanism and gun nozzle of the present utility model;

FIG. 5 is a partial cross-sectional view of the force mechanism and gun nozzle of the present utility model;

FIG. 6 is a cross-sectional view of a first spring unit of the present utility model;

FIG. 7 is a schematic view of the construction of a first variable pitch spring of the present utility model;

FIG. 8 is a schematic view of a second variable pitch spring of the present utility model;

FIG. 9 is a schematic view of a third variable pitch spring of the present utility model;

FIG. 10 is a cross-sectional view of a second spring unit of the present utility model;

FIG. 11 is a cross-sectional view of a third spring unit of the present utility model;

1-a force supply mechanism; 2-a driving mechanism; 3-a housing; a 4-lithium battery module; 5-gun nozzle; 6-a nail feeding device;

11-a cylinder; 111-front side; 112-a rear side; 12-a rod seat; 13-shooting a nail rod;

14-layer spring portion; 142-a pitch spring; 1421-a torque section; 1422-equidistant segments; 1423-first equidistant section; 1424-second equidistant section; 1425-transition section; 15-a linkage piece; 151-mounting part; 152-a guide rod portion; 16-a guide bar; 17-a cushioning member; 18-front cushioning; 19-rear cushioning;

20-driving a platform; 21-notched gears; 211-tooth; 212-notch portion; 22-speed reducer; 23-driving a motor; 24-cam; 25-limit switches; 26-drive teeth.

Detailed Description

The following describes specific embodiments of the present utility model with reference to the drawings and examples.

Embodiment one:

FIG. 1 is a schematic view of the structure of the nail gun of the present utility model.

As shown in fig. 1, the nail gun includes a gun nozzle 5, a nail feeding device 6, a driving device, a lithium battery module 4, and a housing 3.

The gun nozzle 5 is internally provided with a transmitting channel and is provided with a shooting outlet used for shooting nails; the nail feeding device 6 is provided with a nail passing channel, nails are arranged in the nail passing channel, and the emission channel is connected with the nail passing channel; the rear end of the gun nozzle 5 is provided with a driving device for driving the nail. The driving device is externally wrapped with a shell 3, a handle extends behind the shell 3, a lithium battery module 4 for supplementing energy to the driving mechanism 2 is arranged at the lower end of the handle, and a nail shooting switch for controlling the driving device is arranged at the upper end of the handle.

Fig. 2 is a schematic structural view of the force supply mechanism, the driving mechanism and the gun nozzle according to the present utility model, and fig. 3 is a schematic structural view of the force supply mechanism and the gun nozzle according to the present utility model.

As shown in fig. 2, the drive device includes a force supply mechanism 1 and a drive mechanism 2.

Wherein, the force supply mechanism 1 is arranged at the rear end of the gun nozzle 5 and is used for supplementing the power for striking nails; the driving mechanism 2 is provided on one side of the force supply mechanism 1 as an external device of the force supply mechanism 1 for controlling the force supply mechanism 1 to strike nails.

Fig. 4 is a cross-sectional view of the drive mechanism and gun nozzle of the present utility model.

As shown in fig. 4, a driving platform 20 is integrally formed on one side of the front side 111, a driving mechanism 2 is arranged on the driving platform 20, and the driving mechanism 2 comprises driving teeth 26 arranged on one side of the nail shooting rod 13, a notch gear 21 mounted on the driving platform 20, a speed reducer 22 and a driving motor 23.

The output end of the driving motor 23 is connected with the input end of the speed reducer 22, the notch gear 21 is arranged at the output end of the speed reducer 22, and the notch gear 21 is provided with a tooth part 211 meshed with the driving tooth 26 and a notch part 212 not meshed with the driving tooth 26.

Wherein, for easy installation, the driving platform 20 is perpendicular to the working surface of the front side 111. The driving motor 23 is mounted on the lower end face of the driving platform 20 through a speed reducer 22, and the notch gear 21 is mounted on the upper end face of the driving platform 20. A cam 24 and a limit switch 25 are also arranged above the notch gear 21, and the cam 24 and the notch gear 21 synchronously rotate. When the convex portion of the cam 24 touches the limit switch 25, the limit switch 25 controls the drive motor 23 to stop rotating.

The lithium battery module 4 supplies power to the driving motor 23, and the nail shooting switch is used for controlling the driving motor 23 to work.

The driving teeth 26 are provided on the side of the nail shooting bar 13 near the notch gear 21, and intermesh with the teeth 211 of the notch gear 21. Wherein the length of all the driving teeth 26 is adapted to the compressed length of the spring unit, and the number of teeth 211 is adapted to the number of teeth of all the driving teeth 26. In this embodiment, the tooth 211 occupies about 3/4 of the circumference of the tooth theory of the notch, the notch 212 occupies about 1/4 of the circumference of the tooth theory of the notch, and at this time, the notch gear 21 rotates 270 °, the moving amount of the nail shooting rod 13 is required to satisfy the compression of the spring unit to the nail shooting position.

When the tooth part 211 is meshed with the driving tooth 26, the rotation of the notch gear 21 can drive the nail shooting rod 13 to move; when the notch 212 is opposite to the driver 13, that is, the tooth 211 does not engage the driving tooth 26, the driver 13 is in a state of being restrained by the notch-free gear 21.

FIG. 5 is a partial cross-sectional view of the force mechanism and gun nozzle of the present utility model;

as shown in fig. 5, the force supply mechanism 1 includes a cylinder 11, a rod seat 12, a nail shooting rod 13, a spring unit, and a buffer member 17.

The cylinder 11 is made of a metal material, and the cylinder 11 has a front side 111 and a rear side 112, and the front side 111 and the rear side 112 may be integrally formed at front and rear ends of the cylinder or may be separately disposed at the front and rear ends of the cylinder. In this embodiment, the front and rear ends of the cylinder 11 are respectively fixed with a front side 111 and a rear side 112 by screws, and the front side 111 is provided with the gun nozzle 5.

The cylinder 11 is provided with a plurality of symmetrically arranged guide rods 16, two ends of each guide rod 16 are respectively fixed with the front side part 111 and the rear side part 112, and the rod seat 12 is movably arranged on the guide rods 16. Specifically, the front and rear ends of the guide rod 1 are provided with mounting posts, the front side 111 and the rear side 112 are provided with mounting grooves adapted to the corresponding shapes of the mounting posts, and the guide rod 1 is fixed in the cylinder 11 through the mounting grooves.

The inside movable mounting of cylinder body 11 has pole seat 12 and penetrates nail pole 13, offer the mounting hole with guide bar 16 looks adaptation on the pole seat 1, pole seat 1 is through the mounting hole activity setting on the guide bar 16, pole seat 12 is cut apart cylinder body 11 into front side chamber and rear side chamber. The nail-shooting bar 13 has a mounting end mounted on the bar base 12 and a nail-shooting end extending from the front side 111 for striking a nail. Specifically, a mounting post is extended from the middle of the front end surface of the rod seat 12, a mounting groove is provided on the mounting post, and the mounting end of the nail shooting rod 13 is inserted in the mounting groove and fixedly connected through a mounting pin. The firing end of the shank 13 extends through the front side 111 and into the firing channel of the gun nozzle 5 and is used to strike a nail.

Fig. 6 is a sectional view of the spring unit of the present utility model, and fig. 7 is a schematic structural view of the first pitch spring of the present utility model.

As shown in fig. 6, the spring unit is freely installed between the lever seat and the rear side part, and has at least one variable-pitch spring 142 abutting against the lever seat. The pitch spring 142 is also called a pitch spring, i.e. different positions, the helix angle of the spring is different, and the pitch t is also different.

The pitch spring 142 has at least one pitch section 1421, and the pitch t of the pitch section 1421 is gradually increased or decreased.

As shown in fig. 7, the variable-pitch spring 142 has two variable-pitch sections 1421, and the two variable-pitch sections 1421 are all formed by screwing the same wire. One of the pitch-changing sections 1421 has a gradually decreasing pitch t, and the other pitch-changing section 1421 has a gradually increasing pitch t, so that the whole pitch-changing spring 142 is in a state of small middle pitch and large pitch at both ends.

In order to increase the nail shooting power, the spring unit is also provided with a plurality of distance-changing springs which are arranged in parallel, and the specification parameters of the distance-changing springs are the same and are symmetrically distributed around the central extension line of the nail shooting rod. In order to better achieve the deformation of the spring, the variable-pitch spring is fitted over the corresponding guide rod 16.

When the spring unit has only one pitch spring, the guide rod 16 is not required and can be directly guided through the inner wall of the cylinder 11 to achieve the same effect.

The front end of the pitch-changing spring is provided with a front buffer member 18, the rear end of the pitch-changing spring is provided with a rear buffer member 19, and the front buffer member 18 and the rear buffer member 19 are annular and sleeved on the corresponding guide rods 16.

Further, the inner wall of the front side 111 of the cylinder 11 is provided with a damper 17, and the outer edge of the damper 17 abuts against the inner wall of the metal cylinder 11. After the shooting, the rod seat 12 hits the buffering member 17, the buffering member 17 contracts, and the impact force is rapidly transmitted to the cylinder 11, thereby achieving rapid transfer and dissipation.

Wherein the cushioning members 17, the front cushioning members 18, and the rear cushioning members 19 are all made of rubber or elastic plastic.

Because the pitch of the variable-pitch springs is different, the generated vibration frequencies are also different, so that after compression and release work is done, different parts of the variable-pitch springs generate different resilience forces, different accelerations are formed, the variable-pitch springs can be mutually abutted against each other, and the rebound acceleration is reduced inside, so that the resilience force of the abutted part is partially overcome. The impact force acting on the cylinder body is reduced, and the vibration reduction effect is realized.

Meanwhile, the rebound acceleration is reduced, so that the vibration time of the spring unit is also reduced, the working stability of the nail gun is ensured, the labor intensity of a user is reduced, and the nailing effect is improved.

< modification 1-1>

Fig. 8 is a schematic structural view of a second type of pitch spring of the present utility model.

The pitch spring also has at least one equidistant section connected with the pitch changing section, and the pitches of the equidistant sections are the same.

As shown in fig. 8, the pitch spring 142 has a pitch section 1421 and an equidistant section 1422, and both the pitch section 1421 and equidistant section 1422 are formed by a single wire spiral. The pitch t of one of the gauge sections 1421 gradually decreases and the pitch t of the equidistant sections 1422 is equal.

After compression and release work is done, the pitch of the variable-pitch spring is different, so that the generated vibration frequency is different, and the nailing effect is improved.

< modification examples 1 to 2>

The pitch-variable spring is provided with at least two equidistant sections with different pitches and a transition section for connecting the adjacent two equidistant sections, and the pitches of the same equidistant section are the same.

Fig. 9 is a schematic structural view of a third type of pitch spring according to the present utility model.

As shown in fig. 9, the variable-pitch spring has a first equidistant section 1423, a second equidistant section 1424, and a transition section 1425 connecting the first equidistant section 1423 and the second equidistant section 1424, wherein the first equidistant section 142, the second equidistant section 1424, and the transition section are all formed by a spiral of the same wire. The pitches of the first equidistant sections 1423 are t1, the pitches t2 of the second equidistant sections 1424, and the pitches t1 of the first equidistant sections 1423 are smaller than the pitches t2 of the second equidistant sections 1424.

When there are a plurality of first equidistant sections 1423 and second equidistant sections 1424, the first equidistant sections 1423 are spaced apart from the second equidistant sections 1424 and are connected by the transition sections 1425.

After compression and release work is done, the pitch of the variable-pitch spring is different, so that the generated vibration frequency is different, and the nailing effect is improved.

Embodiment two:

the present embodiment provides the structure of the second force supply mechanism:

the spring unit has at least two layers of spring portions 14 and a linkage piece 15.

The layer spring portions 14 are arranged along the moving direction of the lever seat. Wherein each layer of the layer spring part is provided with at least one distance-changing spring, and the linkage piece 15 is arranged between two adjacent layers of the layer spring parts and is used for linking the two layers of the layer spring parts.

When each layer of spring portion 14 has only one pitch spring 141, all the pitch springs 141 may be serially connected, and the pitch springs 141 of adjacent layers may be combined by the linkage piece 15.

In this embodiment, the integrated elastic coefficients of the two-layer spring portions are set to be different. Because the comprehensive elastic coefficients of the two layers of spring parts are different, the spring unit can rebound after shooting nails, and different accelerations caused by different rebound forces of the two layers of spring parts cause mutual buffering between the two layers of spring parts, so that rebound acceleration is reduced, and the rebound force of the portion is offset. The impact force acting on the cylinder body is reduced, and the vibration reduction effect is realized. Meanwhile, the rebound acceleration is reduced, so that the vibration time of the spring unit is also reduced, the working stability of the nail gun is ensured, and the labor intensity of a user is reduced.

< modification example 2-1>

Fig. 10 is a cross-sectional view of a second spring unit of the present utility model.

As shown in fig. 10, the layer spring portion disposed near the front side portion serves as a front layer spring portion, the layer spring portion disposed near the rear side portion serves as a rear layer spring portion, the front layer spring portion and the rear layer spring portion have different overall elastic coefficients, and the front layer spring portion or the rear layer spring portion has at least two pitch springs disposed in parallel and symmetrically distributed around a central extension line of the nail-shooting rod.

Preferably, the pitch spring spiral direction of each layer of the layer spring part is the same; the spiral directions of the variable-pitch springs in the adjacent two layers of spring parts are opposite. Specifically, in the front layer spring portion, the spiral directions of the variable-pitch springs of each group arranged in parallel are the same, and are opposite to the spiral directions of the variable-pitch springs of the rear layer spring portion.

In this embodiment, two parallel pitch springs 141 are provided in the front layer spring portion, and one pitch spring 141 is provided in the rear layer spring portion.

Two symmetrically arranged guide rods are arranged in the cylinder body, two ends of each guide rod are respectively fixed with the front side part and the rear side part, and the rod seat is movably arranged on a plurality of guide rods 16. The pitch springs 141 of the front spring part are respectively sleeved on the corresponding guide rods 16.

In order to facilitate the installation with the rear spring portion, the linkage piece 15 has a plurality of installation portions 151 movably provided on the guide bar 16 and at least one guide bar portion 152. The two mounting portions 151 are provided, and the two mounting portions are provided with mounting holes adapted to the shape of the guide rod, and are sleeved on the guide rod 16, and the mounting portions 151 abut against one end of the pitch change spring 141 corresponding to the front layer spring portion. The guide rod portion 152 is extended from the center of the rear side of the linkage piece 15, one end of the rear spring portion is mounted on the guide rod portion 152, and the other end is mounted on the rear side portion 112 of the cylinder 11.

If one pitch spring 141 is provided in the front layer spring portion, and two pitch springs 141 connected in parallel are provided in the rear layer spring portion, the position of the linkage piece 15 is only required to be reversed, so that one end of the front layer spring portion is mounted on the guide rod portion 152, and the other end is mounted on the rod seat 12.

In order to further improve the vibration damping effect, the lever seat includes a front buffer 18 for buffering the vibration of the front layer spring portion; the rear side portion includes a rear cushion 19 for cushioning vibrations of the rear spring portion.

The spring unit of this modification also has the following advantages:

1. on the premise of not enlarging the cylinder body 11, the comprehensive elastic coefficient of the spring unit can be further increased, and larger nail shooting power is provided.

2. Because the rotation direction, the mass and the rigidity of the springs are different, the vibration frequencies of the springs are inconsistent after compression and release work, so that the springs cannot resonate, and the reaction forces of the springs can offset one part of the springs, so that the vibration after work is greatly reduced, the vibration reduction effect and the nailing effect are improved, and the nailing is more labor-saving and comfortable.

< modification example 2-2>

Fig. 11 is a cross-sectional view of a third spring unit of the present utility model.

As shown in fig. 11, two parallel pitch springs 141 are provided in the front layer spring portion of the present embodiment, and two parallel pitch springs 141 are also provided in the rear layer spring portion. The two sets of pitch springs 141 of the front and rear spring portions are respectively sleeved on the two guide rods 16 and interact through the linkage piece 15.

The above embodiments are only preferred embodiments of the present utility model, and are not intended to limit the scope of the present utility model in this way, therefore: all equivalent changes in structure, shape and principle of the utility model should be covered in the scope of protection of the utility model.

Claims (10)

1. A variable-pitch type force supply mechanism installed in a nail gun for providing power for nail shooting, comprising:

a cylinder disposed within the nail gun and having a front side and a rear side;

the rod seat is movably arranged in the cylinder body and divides the cylinder body into a front side cavity and a rear side cavity;

the nail shooting rod is fixedly combined with the rod seat and provided with a nail shooting end which extends out of the front side part and is used for shooting nails; and

and a spring unit which is freely arranged between the rod seat and the rear side part and is provided with at least one variable-pitch spring which is abutted against the rod seat.

2. A torque-transmitting mechanism according to claim 1, wherein:

wherein the variable-pitch spring is provided with at least one variable-pitch section,

the pitch of the pitch-changing section is gradually increased or decreased.

3. A torque-transmitting type force mechanism according to claim 2, wherein:

wherein the variable-pitch spring is also provided with at least one equidistant section connected with the variable-pitch section,

the pitches of the equidistant segments are all the same.

4. A torque-transmitting mechanism according to claim 1, wherein:

wherein the pitch spring is provided with at least two equidistant sections with different pitches, a transition section connecting the adjacent two equidistant sections,

the pitch of the same equidistant segments is the same.

5. A torque converter type force supply mechanism according to any one of claims 1 to 4, wherein:

the spring unit is provided with at least two pitch-changing springs which are arranged in parallel and are symmetrically distributed around the central extension line of the nail shooting rod.

6. A torque converter type force supply mechanism according to any one of claims 1 to 4, wherein:

wherein the spring unit has:

at least two layers of spring parts are distributed along the moving direction of the rod seat; and

the linkage piece is arranged between the two adjacent layers of the layer spring parts and is used for linking the two layers of the layer spring parts,

each of the layer spring portions includes at least one of the pitch springs.

7. The variable-pitch type force supply mechanism according to claim 6, wherein:

wherein the layer spring portion provided near the front side portion serves as a front layer spring portion,

the layer spring portion provided near the rear side portion serves as a rear layer spring portion,

the front layer spring part and the rear layer spring part have different comprehensive elastic coefficients,

the front layer spring part or the rear layer spring part is provided with at least two variable-pitch springs which are arranged in parallel and symmetrically distributed around the central extension line of the nail shooting rod;

the linkage piece is provided with a plurality of mounting parts movably arranged on the guide rod and at least one guide rod part;

one end of the rear layer spring part or the front layer spring part is installed on the guide rod part, and the other end is installed on the rear side part or the rod seat of the cylinder body.

8. A torque-transmitting mechanism according to claim 1, wherein:

wherein a plurality of symmetrically arranged guide rods are arranged in the cylinder body, two ends of each guide rod are respectively fixed with the front side part and the rear side part,

the rod seat is movably arranged on a plurality of the guide rods,

the spring units are provided with the pitch springs in the same number as the guide rods,

each variable-pitch spring is respectively arranged on the corresponding guide rod.

9. A torque-transmitting mechanism according to claim 1, wherein:

wherein the rod seat comprises a front buffer piece,

the rear side portion includes a rear cushion for cushioning vibrations of the pitch spring.

10. A nail gun, comprising:

a driving device, which has:

the variable-pitch type force supply mechanism is used for providing power for shooting nails; and

a driving unit for driving the variable-pitch type force supply mechanism to generate the power,

wherein the variable-pitch type force supply mechanism is as claimed in any one of claims 1 to 9.