Fastener driver

Abstract

A fastener driver includes an energy storage unit, an impact unit, a rotary power unit and a driving unit, the impact unit is used to drive the energy storage unit to store energy and can bear the impact energy released by the energy storage unit to drive the fastener into a workpiece along a first direction, the impact unit includes a first matching structure and a second matching structure, the driving unit includes a first planetary gear assembly and a second planetary gear assembly, the first planetary gear assembly and the second planetary gear assembly are driven by the rotary power unit; the energy storage process of the energy storage unit includes a first stage and a second stage, in the first stage, the first planetary gear assembly matches with the first matching structure, so that the impact unit drives the energy storage unit to store energy, in the second stage, the first planetary gear assembly is disengaged from the first matching structure, the second planetary gear assembly matches with the second matching structure, so that the impact unit drives the energy storage unit to store energy.

Description

Technical Field

[0001] This application relates to the field of power tools, and more particularly to a fastener driving machine. Background Technology

[0002] Typically, a fastener driving machine includes an energy storage unit, a drive unit, a rotary power unit, and an impact unit. The drive unit includes multiple first meshing teeth, and the impact unit includes multiple second meshing teeth. During operation, the multiple first meshing teeth of the drive unit engage with the multiple second meshing teeth of the impact unit. The drive unit drives the impact unit to move along a second direction so that the energy storage unit stores energy. Under the action of the energy released by the energy storage unit, the impact unit moves along a first direction to drive the fastener into the workpiece. The first direction is opposite to the second direction. When the fastener gets stuck, the impact unit may not stop at a position where it can properly engage with the drive unit, causing the fastener driving machine to malfunction.

[0003] Therefore, it is necessary to provide a new fastener driving machine. Summary of the Invention

[0004] This application provides a fastener insertion machine that operates stably and smoothly.

[0005] On one hand, this application provides a fastener driving machine, which includes:

[0006] Energy storage unit, used to store strike energy;

[0007] An impact unit is used to drive the energy storage unit to store energy and withstand the impact energy released by the energy storage unit to drive the fastener into the workpiece along a first direction. The impact unit includes a first mating structure and a second mating structure, which are disposed at different positions in the extending direction of the impact unit.

[0008] Rotary power unit;

[0009] The drive unit includes a first planetary gear assembly and a second planetary gear assembly, wherein the first planetary gear assembly and the second planetary gear assembly are driven by the rotary power unit.

[0010] The energy storage process of the energy storage unit includes a first stage and a second stage. In the first stage, the first planetary gear assembly engages with the first mating structure, causing the impact unit to drive the energy storage unit to store energy. In the second stage, the first planetary gear assembly disengages from the first mating structure, and the second planetary gear assembly engages with the second mating structure, causing the impact unit to drive the energy storage unit to store energy.

[0011] Furthermore, as the first planetary gear assembly disengages from the first mating structure, the second planetary gear assembly engages with the second mating structure.

[0012] Furthermore, the drive unit includes a rotatable output shaft, and the first planetary gear assembly and the second planetary gear assembly are distributed along the axial direction of the output shaft. The first planetary gear assembly includes a fixed first internal gear ring, a first planetary gear revolving relative to the first internal gear ring, and a first push structure connected to the first planetary gear. The second planetary gear assembly includes a fixed second internal gear ring, a second planetary gear revolving relative to the second internal gear ring, and a second push structure connected to the second planetary gear. The first planetary gear meshes with the first internal gear ring, and the second planetary gear meshes with the second internal gear ring. The first push structure cooperates with the first mating structure to push the impact unit, and the second push structure cooperates with the second mating structure to push the impact unit.

[0013] Furthermore, the mating area between the first pushing structure and the first mating structure is defined as the first mating area, the mating area between the second pushing structure and the second mating structure is defined as the second mating area, the projection of the first mating area onto the extension direction of the impact unit is defined as the first projection, and the projection of the second mating area onto the extension direction of the impact unit is defined as the second projection. The first projection and the second projection do not overlap.

[0014] Furthermore, the first internal gear ring and the second internal gear ring are arranged opposite each other along the axial direction of the output shaft, the first push structure is eccentrically connected to the first planetary gear, and the second push structure is eccentrically connected to the second planetary gear.

[0015] Furthermore, the first pushing structure includes a first retaining shaft, and the second pushing structure includes a second retaining shaft. The first retaining shaft is eccentrically connected to the first planetary gear, and the second retaining shaft is eccentrically connected to the second planetary gear.

[0016] Furthermore, the impact unit also includes an impact rod, wherein the first mating structure and the second mating structure are respectively a first tooth and a second tooth disposed on the same side of the impact rod, and the projection of the first tooth in the extension direction of the impact rod and the projection of the second tooth in the extension direction of the impact rod do not coincide or partially coincide.

[0017] Furthermore, the first planetary gear assembly also includes a first crank connected to the output shaft and rotatable with the output shaft, the first planetary gear being rotatable and connected to the first crank; the second planetary gear assembly also includes a second crank connected to the output shaft and rotatable with the output shaft, the second planetary gear being rotatable and connected to the second crank.

[0018] Furthermore, the first crank includes a first crankshaft, the second crank includes a second crankshaft, the first planetary gear is rotatably mounted on the first crankshaft, and the second planetary gear is rotatably mounted on the second crankshaft.

[0019] Furthermore, the line connecting the center of the first crankshaft and the center of the output shaft is defined as the first line, and the line connecting the center of the second crankshaft and the center of the output shaft is defined as the second line. The angle between the projection of the first line onto the extension direction of the output shaft and the projection of the second line onto the extension direction of the output shaft is 120°.

[0020] Furthermore, the fastener insertion machine also includes a support mechanism disposed between the first planetary gear assembly and the second planetary gear assembly, the support mechanism being mounted on the output shaft and abutting against the first planetary gear and the second planetary gear.

[0021] Furthermore, the support mechanism includes a spring, a first pressure sleeve, and a second pressure sleeve. The spring, the first pressure sleeve, and the second pressure sleeve are all sleeved and installed on the output shaft. The spring is disposed between the first pressure sleeve and the second pressure sleeve. The first pressure sleeve abuts against the first planetary gear, and the second pressure sleeve abuts against the second planetary gear.

[0022] Furthermore, the support mechanism also includes a first support sleeve and a second support sleeve, both of which are sleeved and installed on the output shaft. The first pressure sleeve is supported between the spring and the first support sleeve, and the second pressure sleeve is supported between the spring and the second support sleeve.

[0023] Furthermore, the ratio of the number of teeth of the first internal gear ring to the number of teeth of the first planetary gear is 3:1, and the ratio of the number of teeth of the second internal gear ring to the number of teeth of the second planetary gear is 3:1.

[0024] Furthermore, in the arrangement direction of the first planetary gear assembly and the second planetary gear assembly, the impact unit is located between the first planetary gear assembly and the second planetary gear assembly.

[0025] Furthermore, the impact unit also includes an impact rod, with the first mating structure and the second mating structure disposed on the same side of the impact rod; in the extension direction of the impact rod, the first mating structure and the second mating structure are disposed at different positions; the first mating structure is installed on the impact rod by means of cylindrical pin positioning and screw fastening.

[0026] Furthermore, the drive unit includes a rotatable output shaft that extends through at least a portion of the first planetary gear assembly and at least a portion of the second planetary gear assembly.

[0027] In this application, the drive unit includes a first planetary gear assembly and a second planetary gear assembly distributed along the axial direction of the output shaft. The first pushing structure of the first planetary gear assembly can only cooperate with the first mating structure of the impact unit, and the second pushing structure of the second planetary gear assembly can only cooperate with the second mating structure of the impact unit. They are independent of each other and do not interfere with each other, so there will be no misfitting or even jamming. Attached Figure Description

[0028] Figure 1 This is a structural diagram of a portion of the fastener driving machine of this application.

[0029] Figure 2 yes Figure 1 This is a structural diagram of one view of a portion of the fastener-driving machine shown.

[0030] Figure 3 yes Figure 2 The diagram shows a partial structural view of the fastener-driving machine along section AA.

[0031] Figure 4 yes Figure 1 The diagram shows a partial structure of the fastener driving machine.

[0032] Figure 5 yes Figure 4 This is a structural diagram of one view of a portion of the fastener-driving machine shown.

[0033] Figure 6 yes Figure 5 The diagram shows a partial structural view of the fastener-driving machine along section BB.

[0034] Figure 7 yes Figure 4 The diagram shows a partial structure of the fastener driving machine.

[0035] Figure 8 This is a state diagram of a working cycle of the fastener driving machine of this application.

[0036] Figure 9This is a diagram showing the various states of the fastener driving machine of this application during a working cycle under jammed conditions. Detailed Implementation

[0037] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application.

[0038] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit the application. Unless otherwise defined, the technical or scientific terms used in this application should be understood in their ordinary sense by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, "a" or "one," and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. "A plurality" or "several" indicates two or more. Unless otherwise indicated, terms such as "front," "rear," "lower," and / or "upper" are for ease of description only and are not limited to a location or spatial orientation. Terms such as "comprising" or "including" mean that the elements or objects preceding "comprising" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections and can include electrical connections, whether direct or indirect. The singular forms “a,” “the,” and “the” used in this application specification and appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0039] Please refer to Figures 1 to 7This application provides a fastener driving machine, which includes an energy storage unit 10, an impact unit 20, a drive unit 30, a rotary power unit 40, and a support unit 50. The impact unit 20 is used to drive the energy storage unit 10 to store energy and can withstand the impact energy released by the energy storage unit to drive the fastener into the workpiece along a first direction X. The support unit 50 supports the energy storage unit 10, the impact unit 20, the drive unit 30, and the rotary power unit 40. The fastener driving machine includes a fastener guide plate 51 and a fastener storage clamp 52. The fastener storage clamp 52 is connected to the fastener guide plate 51 and contains fasteners (not shown in the figure). The fastener storage clamp 52 can feed the fasteners to the fastener guide plate 51, and the fastener guide plate 51 guides the fasteners. The fasteners are used to be driven into the workpiece by the impact unit 20. In this application, the fastener is a nail, the fastener guide plate 51 is a nail guide plate, and the fastener storage clamp 52 is a nail clamp.

[0040] The energy storage unit 10 is a medium that can store energy through displacement changes, such as an air spring, a mechanical spring, or a rubber component. In this application, the energy storage unit 10 is an air spring, which includes a cylinder 11, a piston 12, and a sealing ring 13. The cylinder 11 and the piston 12 form a closed space containing gas, and the cylinder 11 and the piston 12 are sealed together by the sealing ring 13. One end of the impact unit 20 is connected to the piston 12, and the other end of the impact unit 20 is used to drive the fastener into the workpiece. The impact unit 20 can move together with the piston 12. The energy storage unit 10 is used to store impact energy. The drive unit 30 cooperates with the impact unit 20 to push the impact unit 20 to move along the second direction Y, thereby driving the energy storage unit 10 to store energy. When the energy storage unit 10 releases the impact energy, the impact unit 20 receives the impact energy released by the energy storage unit 10 and drives the fastener into the workpiece along the first direction X. The first direction X is opposite to the second direction Y.

[0041] The rotary power unit 40 provides rotational power to the drive unit 30. The rotary power unit 40 includes a motor 41 and a gear transmission mechanism 42. The rotational speed and torque output by the motor 41 are transmitted to the drive unit 30 via the gear transmission mechanism 42. The gear transmission mechanism 42 is used to reduce the rotational speed and increase the torque. The gear transmission mechanism 42 includes one or more stages of planetary gear transmission; in this embodiment, the gear transmission mechanism 42 includes a three-stage planetary gear transmission. The gear transmission mechanism 42 also includes a one-way clutch, so that when the impact unit 20 is in a pre-compression state, after the power to the motor 41 is cut off, the motor 41 will not reverse, causing the drive unit 30 to disengage from the impact unit 20.

[0042] The impact unit 20 includes an impact rod 23 and a first mating structure 21 and a second mating structure 22 disposed on the same side of the impact rod 23. The first mating structure 21 and the second mating structure 22 are disposed at different positions in the extending direction of the impact rod 23. In this embodiment, the first mating structure 21 and the second mating structure 22 are respectively a first tooth and a second tooth disposed on the same side of the impact rod 23. In other embodiments, the first mating structure 21 and the second mating structure 22 are respectively a first groove and a second groove disposed on the same side of the impact rod 23.

[0043] The drive unit 30 includes a rotatable output shaft 43 and a first planetary gear assembly 31 and a second planetary gear assembly 32 distributed along the axial direction of the output shaft 43. The first planetary gear assembly 31 and the second planetary gear assembly 32 are arranged opposite each other along the axial direction of the output shaft 43. The impact unit 20 is located between the first planetary gear assembly 31 and the second planetary gear assembly 32 in the arrangement direction of the first planetary gear assembly 31 and the second planetary gear assembly 32. The output shaft 43 is driven by the rotary power unit 40. The output shaft 43 passes through at least a portion of the first planetary gear assembly 31 and at least a portion of the second planetary gear assembly 32; specifically, the first planetary gear assembly 31 and the second planetary gear assembly 32 are mounted on the output shaft 43. The energy storage process of the energy storage unit 10 includes a first stage and a second stage. In the first stage, the first planetary gear assembly 31 engages with the first mating structure 21, causing the impact unit 20 to drive the energy storage unit 10 to store energy. In the second stage, the first planetary gear assembly 31 disengages from the first mating structure 21, and the second planetary gear assembly 32 engages with the second mating structure 22, causing the impact unit 20 to drive the energy storage unit 10 to store energy. Specifically, in some embodiments, while the first planetary gear assembly 31 disengages from the first mating structure 21, the second planetary gear assembly 32 engages with the second mating structure 22, causing the impact unit 20 to drive the energy storage unit 10 to store energy. In other embodiments, when the second planetary gear assembly 32 engages with the second mating structure 22, the first planetary gear assembly 31 has not yet disengaged from the first mating structure 21. After running for a period of time, the first planetary gear assembly 31 disengages from the first mating structure 21, while the second planetary gear assembly 32 still engages with the second mating structure 22, causing the impact unit 20 to drive the energy storage unit 10 to store energy.

[0044] The first planetary gear assembly 31 includes a fixed first internal gear ring 311, a first planetary gear 312 revolving relative to the first internal gear ring 311, a first push structure 313 connected to the first planetary gear 312, and a first crank 314 connected to the output shaft 43 and rotatable with the output shaft 43. The second planetary gear assembly 32 includes a fixed second internal gear ring 321, a second planetary gear 322 revolving relative to the second internal gear ring 321, a second push structure 323 connected to the second planetary gear 322, and a second crank 324 connected to the output shaft 43 and rotatable with the output shaft 43. The first planetary gear 312 meshes with the first internal gear ring 311, and the second planetary gear 322 meshes with the second internal gear ring 321. The first planetary gear 312 is rotatable and connected to the first crank 314 and rotatable with the first crank 314. The second planetary gear 322 is rotatable and connected to the second crank 324 and rotatable with the second crank 324. The first pushing structure 313 rotates with the rotation of the first planetary gear 312, and the second pushing structure 323 rotates with the rotation of the second planetary gear 322. The first pushing structure 313 cooperates with the first mating structure 21 to push the impact unit 20 to move a first stroke along the second direction Y. The second pushing structure 323 cooperates with the second mating structure 22 to push the impact unit 20 to move a second stroke along the second direction Y. The first stroke and the second stroke are superimposed to form a complete stroke. The ratio of the number of teeth of the first internal gear ring 311 to the number of teeth of the first planetary gear 312 is 3:1, and the ratio of the number of teeth of the second internal gear ring 321 to the number of teeth of the second planetary gear 322 is 3:1. The first crank 314 includes a first crankshaft 315, and the second crank 324 includes a second crankshaft 325. The first planetary gear 312 is rotatably mounted on the first crankshaft 315, and the second planetary gear 322 is rotatably mounted on the second crankshaft 325. The line connecting the center of the first crankshaft 315 and the center of the output shaft 43 is defined as the first line, and the line connecting the center of the second crankshaft 325 and the center of the output shaft 43 is defined as the second line. The angle between the projection of the first line in the extension direction of the output shaft 43 and the projection of the second line in the extension direction of the output shaft 43 is 120°.

[0045] The mating area between the first pushing structure 313 and the first mating structure 21 is defined as the first mating area, and the mating area between the second pushing structure 323 and the second mating structure 22 is defined as the second mating area. The projection of the first mating area onto the extension direction of the impact rod 23 is defined as the first projection, and the projection of the second mating area onto the extension direction of the impact rod 23 is defined as the second projection. The first projection and the second projection do not overlap. The projection of the first tooth 21 onto the extension direction of the impact rod 23 and the projection of the second tooth 22 onto the extension direction of the impact rod 23 do not coincide or partially coincide. This design ensures that the first pushing structure 313 of the first planetary gear assembly 31 can only mate with the first mating structure 21 of the impact unit 20, and the second pushing structure 323 of the second planetary gear assembly 32 can only mate with the second mating structure 22 of the impact unit 20, operating independently and without interference. In this embodiment, the first tooth 21 is installed on the impact rod 23 by means of cylindrical pin positioning and screw fastening, while the second tooth 22 is integrally formed on the impact rod 23; in other embodiments, both the first tooth 21 and the second tooth 22 can be integrally formed on the impact rod 23.

[0046] The support unit 50 also includes an upper cover 53 and a base 54, with the output shaft 43 located between the upper cover 53 and the base 54. The two ends of the output shaft 43 are supported by a first bearing 61 and a second bearing 62, respectively. Specifically, the first end of the output shaft 43 is supported by the first bearing 61, which is located between the upper cover 53 and the first end of the output shaft 43. The second end of the output shaft 43 is supported by the second bearing 62, which is located between the base 54 and the second end of the output shaft 43. It should be noted that the gear transmission mechanism 42 is not essential; when the torque output by the motor 41 is sufficiently large, the motor shaft can directly serve as the output shaft 43.

[0047] The first internal gear ring 311 and the second internal gear ring 321 are both fixedly disposed within the receiving space formed by the base 54 and the upper cover 53. The first internal gear ring 311 and the second internal gear ring 321 are arranged opposite each other along the axial direction of the output shaft 43. The first push structure 313 is eccentrically connected to the first planetary gear 312 and protrudes from the side of the first planetary gear 312 near the second internal gear ring 321. The second push structure 323 is eccentrically connected to the second planetary gear 322 and protrudes from the side of the second planetary gear 322 near the first internal gear ring 311.

[0048] The first pushing structure 313 includes a first retaining shaft 316 and a first bushing 317 sleeved on the first retaining shaft 316. The second pushing structure 323 includes a second retaining shaft 326 and a second bushing 327 sleeved on the second retaining shaft 326. The first retaining shaft 316 is eccentrically connected to the first planetary gear 312, and the second retaining shaft 326 is eccentrically connected to the second planetary gear 322. When the first mating structure 21 and the second mating structure 22 are respectively the first tooth and the second tooth, the first pushing structure 313 meshes with the first tooth 21, and the second pushing structure 323 meshes with the second tooth 22. When the first mating structure 21 and the second mating structure 22 are respectively the first groove and the second groove, the first pushing structure 313 mates with the first groove, and the second pushing structure 323 mates with the second groove. The bushing is provided to reduce the friction when the pushing structure and the mating structure are engaged; it is not necessary for achieving the function.

[0049] The fastener insertion machine also includes a support mechanism 70 disposed between the first planetary gear assembly 31 and the second planetary gear assembly 32. The support mechanism 70 is mounted on the output shaft 43 and abuts against the first planetary gear 312 and the second planetary gear 322. Specifically, the support mechanism 70 includes a spring 75, a first pressure sleeve 71, a second pressure sleeve 72, a first support sleeve 73, and a second support sleeve 74. The spring 75, the first pressure sleeve 71, the second pressure sleeve 72, the first support sleeve 73, and the second support sleeve 74 are all sleeved and mounted on the output shaft 43. The spring 75 is disposed between the first pressure sleeve 71 and the second pressure sleeve 72. The side of the first pressure sleeve 71 facing away from the spring 75 abuts against the first planetary gear 312, and the side of the second pressure sleeve 72 facing away from the spring 75 abuts against the second planetary gear 322. The first pressure sleeve 71 is supported between the spring 75 and the first support sleeve 73, and the second pressure sleeve 72 is supported between the spring 75 and the second support sleeve 74. The first pressure sleeve 71, the second pressure sleeve 72, and the spring 75 are provided to prevent the planetary gear from axially dislodging from the crankshaft. The first support sleeve 73 is used to support the first pressure sleeve 71, and the second support sleeve 74 is used to support the second pressure sleeve 72.

[0050] The fastener insertion machine also includes a buffer 80, which is disposed between the piston 12 and the base 54. When the piston 12 is not driven by the impact unit 20, the piston 12 is in contact with the buffer 80. At this time, the position of the impact unit 20 is called the bottom dead center. When the piston 12 is driven to the limit position by the impact unit 20, the position of the impact unit 20 is called the top dead center.

[0051] Please combine Figure 8 The states a, b, c, d, e, and f are given. States a through f correspond to one work cycle.

[0052] State a represents the initial state of the entire working cycle. The impact unit 20 is in the pre-compression position, and the impact unit 20 drives the piston 12 to move, compressing the energy storage unit 10. The second push structure 323 of the second planetary gear assembly 32 is engaged with the second tooth 22 of the impact unit 20, while the first push structure 313 of the first planetary gear assembly 31 is disengaged from the first tooth 21 of the impact unit 20. The output shaft 43 continues to rotate counterclockwise, driving the first crank 314 and the second crank 324 to rotate. The second push structure 323 of the second planetary gear assembly 32 continues to push the impact unit 20, which drives the piston 12 to move until state b, at which point the impact unit 20 is at top dead center. The output shaft 43 continues to rotate counterclockwise. The second push structure 323 of the second planetary gear assembly 32 disengages from the second tooth 22 of the impact unit 20. Under the impact energy released by the energy storage unit 10, the impact unit 20 drives the fastener into the workpiece along the first direction X. At this time, the piston 12 reaches the bottom dead center and adheres to the buffer 80, as shown in state c. The output shaft 43 continues to rotate counterclockwise. The first push structure 313 of the first planetary gear assembly 31 does not mesh with the first tooth 21 of the impact unit 20, and the second push structure 323 of the second planetary gear assembly 32 does not mesh with the second tooth 22 of the impact unit 20. After a certain angle of no-load rotation, the first push structure 313 of the first planetary gear assembly 31 begins to mesh with the first tooth 21 of the impact unit 20, as shown in state d. The output shaft 43 continues to rotate counterclockwise. The first pushing structure 313 of the first planetary gear assembly 31 pushes the impact unit 20, which in turn drives the piston 12 to move until state e. At this point, the first pushing structure 313 of the first planetary gear assembly 31 disengages from the first tooth 21 of the impact unit 20, and the second pushing structure 323 of the second planetary gear assembly 32 begins to mesh with the second tooth 22 of the impact unit 20. The output shaft 43 continues to rotate counterclockwise. The first pushing structure 313 of the first planetary gear assembly 31 disengages from the first tooth 21 of the impact unit 20, and the second pushing structure 323 of the second planetary gear assembly 32 meshes with the second tooth 22 of the impact unit 20 to take over pushing the impact unit 20. The impact unit 20 drives the piston 12 to move, as shown in state f. The output shaft 43 continues to rotate counterclockwise. The second pushing structure 323 of the second planetary gear assembly 32 meshes with the second tooth 22 of the impact unit 20 to push the impact unit 20 back to the preload position, completing one working cycle.

[0053] Please combine Figure 9The output shaft 43 rotates counterclockwise, causing the first crank 314 and the second crank 324 to rotate. The second push structure 323 of the second planetary gear assembly 32 continues to push the impact unit 20. The impact unit 20 drives the piston 12 to move until state b, at which point the impact unit 20 is at the top dead center. The output shaft 43 continues to rotate counterclockwise, and the second push structure 323 of the second planetary gear assembly 32 disengages from the second tooth 22 of the impact unit 20. Under the action of the impact energy released by the energy storage unit 10, the impact unit 20 drives the fastener into the workpiece along the first direction X. When the fastener gets stuck for some reason, it gets stuck in the fastener guide plate 51. At this time, the impact unit 20 may stop at any position along the first direction X, as shown in state g. After the pin is engaged, the output shaft 43 continues to rotate counterclockwise. The first push structure 313 of the first planetary gear assembly 31 reaches the position of the second tooth 22 of the impact unit 20, as shown in state h. Since the first push structure 313 of the first planetary gear assembly 31 and the second tooth 22 of the impact unit 20 are distributed at different positions along the axial direction of the output shaft 43, the first push structure 313 and the second tooth 22 cannot mesh with each other. At this time, the first planetary gear assembly 31 and the second planetary gear assembly 32 are still in an unloaded state. The output shaft 43 continues to rotate counterclockwise, and the second push structure 323 of the second planetary gear assembly 32 reaches the position of the second tooth 22 of the impact unit 20. The second push structure 323 and the second tooth 22 are about to mesh, as shown in state i. The output shaft 43 continues to rotate counterclockwise, and the second push structure 323 of the second planetary gear assembly 32 meshes with the second tooth 22 of the impact unit 20 to push the impact unit 20. The impact unit 20 drives the piston 12 to move, as shown in state j. The output shaft 43 continues to rotate counterclockwise, and the second push structure 323 of the second planetary gear assembly 32 meshes with the second tooth 22 of the impact unit 20 to push the impact unit 20 to the pre-compression position and return to the initial state a.

[0054] In this application, the drive unit 30 includes a first planetary gear assembly 31 and a second planetary gear assembly 32 distributed along the axial direction of the output shaft 43. The first push structure 313 of the first planetary gear assembly 31 can only cooperate with the first mating structure 21 of the impact unit 20, and the second push structure 323 of the second planetary gear assembly 32 can only cooperate with the second mating structure 22 of the impact unit 20. They are independent of each other and do not interfere with each other, so there will be no misfitting or even jamming.

[0055] The above description is merely a preferred embodiment of this application and is not intended to limit this application in any way. Although this application has disclosed the preferred embodiment as above, it is not intended to limit this application. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the technical solution of this application. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the content of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A fastener driving machine, characterized in that, The fastener driving machine includes: Energy storage unit, used to store strike energy; An impact unit is used to drive the energy storage unit to store energy and withstand the impact energy released by the energy storage unit to drive the fastener into the workpiece along a first direction. The impact unit includes a first mating structure and a second mating structure, which are disposed at different positions in the extending direction of the impact unit. Rotary power unit; The drive unit includes a rotatable output shaft, a first planetary gear assembly, and a second planetary gear assembly. The output shaft, the first planetary gear assembly, and the second planetary gear assembly are driven by the rotary power unit. The first planetary gear assembly and the second planetary gear assembly are distributed along the axial direction of the output shaft. The output shaft passes through at least a portion of the first planetary gear assembly and at least a portion of the second planetary gear assembly. The energy storage process of the energy storage unit includes a first stage and a second stage. In the first stage, the first planetary gear assembly engages with the first mating structure, causing the impact unit to drive the energy storage unit to store energy. In the second stage, the first planetary gear assembly disengages from the first mating structure, and the second planetary gear assembly engages with the second mating structure, causing the impact unit to drive the energy storage unit to store energy.

2. The fastener driving machine according to claim 1, characterized in that, As the first planetary gear assembly disengages from the first mating structure, the second planetary gear assembly engages with the second mating structure.

3. The fastener driving machine according to claim 1, characterized in that, The first planetary gear assembly includes a fixed first internal gear ring, a first planetary gear revolving relative to the first internal gear ring, and a first push structure connected to the first planetary gear. The second planetary gear assembly includes a fixed second internal gear ring, a second planetary gear revolving relative to the second internal gear ring, and a second push structure connected to the second planetary gear. The first planetary gear meshes with the first internal gear ring, and the second planetary gear meshes with the second internal gear ring. The first push structure cooperates with the first mating structure to push the impact unit, and the second push structure cooperates with the second mating structure to push the impact unit.

4. The fastener driving machine according to claim 3, characterized in that, The mating area between the first pushing structure and the first mating structure is defined as the first mating area, and the mating area between the second pushing structure and the second mating structure is defined as the second mating area. The projection of the first mating area onto the extension direction of the impact unit is defined as the first projection, and the projection of the second mating area onto the extension direction of the impact unit is defined as the second projection. The first projection and the second projection do not overlap.

5. The fastener driving machine according to claim 3, characterized in that, The first internal gear ring and the second internal gear ring are arranged opposite each other along the axial direction of the output shaft. The first push structure is eccentrically connected to the first planetary gear, and the second push structure is eccentrically connected to the second planetary gear.

6. The fastener driving machine according to claim 5, characterized in that, The first pushing structure includes a first retaining shaft, and the second pushing structure includes a second retaining shaft. The first retaining shaft is eccentrically connected to the first planetary gear, and the second retaining shaft is eccentrically connected to the second planetary gear.

7. The fastener driving machine according to claim 1, characterized in that, The impact unit further includes an impact rod, wherein the first mating structure and the second mating structure are respectively a first tooth and a second tooth disposed on the same side of the impact rod, and the projection of the first tooth in the extension direction of the impact rod and the projection of the second tooth in the extension direction of the impact rod do not coincide or partially coincide.

8. The fastener driving machine according to claim 3, characterized in that, The first planetary gear assembly further includes a first crank connected to the output shaft and rotatable with the output shaft, wherein the first planetary gear is rotatable and connected to the first crank and moves with the first crank; the second planetary gear assembly further includes a second crank connected to the output shaft and rotatable with the output shaft, wherein the second planetary gear is rotatable and connected to the second crank and moves with the second crank.

9. The fastener driving machine according to claim 8, characterized in that, The first crank includes a first crankshaft, the second crank includes a second crankshaft, the first planetary gear is rotatably mounted on the first crankshaft, and the second planetary gear is rotatably mounted on the second crankshaft.

10. The fastener driving machine according to claim 9, characterized in that, The line connecting the center of the first crankshaft and the center of the output shaft is defined as the first line, and the line connecting the center of the second crankshaft and the center of the output shaft is defined as the second line. The angle between the projection of the first line onto the extension direction of the output shaft and the projection of the second line onto the extension direction of the output shaft is 120°.

11. The fastener driving machine according to claim 3, characterized in that, The fastener driving machine further includes a support mechanism disposed between the first planetary gear assembly and the second planetary gear assembly. The support mechanism is mounted on the output shaft and abuts against the first planetary gear and the second planetary gear.

12. The fastener driving machine according to claim 11, characterized in that, The support mechanism includes a spring, a first pressure sleeve, and a second pressure sleeve. The spring, the first pressure sleeve, and the second pressure sleeve are all sleeved and installed on the output shaft. The spring is disposed between the first pressure sleeve and the second pressure sleeve. The first pressure sleeve abuts against the first planetary gear, and the second pressure sleeve abuts against the second planetary gear.

13. The fastener driving machine according to claim 12, characterized in that, The support mechanism further includes a first support sleeve and a second support sleeve, both of which are sleeved and installed on the output shaft. The first pressure sleeve is supported between the spring and the first support sleeve, and the second pressure sleeve is supported between the spring and the second support sleeve.

14. The fastener driving machine according to claim 3, characterized in that, The ratio of the number of teeth of the first internal gear ring to the number of teeth of the first planetary gear is 3:1, and the ratio of the number of teeth of the second internal gear ring to the number of teeth of the second planetary gear is 3:

1.

15. The fastener driving machine according to claim 1, characterized in that, In the arrangement direction of the first planetary gear assembly and the second planetary gear assembly, the impact unit is located between the first planetary gear assembly and the second planetary gear assembly.

16. The fastener driving machine according to claim 1, characterized in that, The impact unit further includes an impact rod, and the first mating structure and the second mating structure are disposed on the same side of the impact rod; in the extension direction of the impact rod, the first mating structure and the second mating structure are disposed at different positions; the first mating structure is installed on the impact rod by means of cylindrical pin positioning and screw fastening.

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