Linear motion tool

Abstract

The utility model discloses a linear motion tool which comprises a machine shell, a linear motor and an output assembly receiving power of the linear motor are arranged in the machine shell, and the output assembly comprises an output support and an output acting piece which are fixed to each other. An energy storage mechanism and a counter-force mechanism are further arranged in the machine shell; the energy storage mechanism comprises a reset spring and an energy storage spring. The counter-force mechanism comprises a fixed rack fixed in the machine shell, a sliding rack arranged between the reset spring and the energy storage spring, and a gear meshed with the fixed rack and the sliding rack. The utility model has the beneficial effects that the counter-force mechanism can be used for mutually counteracting or nearly counteracting the force of the energy storage spring and the force of the reset spring finally acting on the whole machine, so that the minimum vibration impact is obtained, the recoil, the vibration sense and the fatigue sense generated during use are reduced, and the working efficiency and the comfort level are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric tools, in particular to a linear motion tool. Background Art

[0002] Linear motion tools can be used in the hardware and electrical industry, specifically in various reciprocating linear motion tools such as electric nail guns, electric picks, and electric hammers.

[0003] Among them, the electric nail gun, also known as the nail gun, is a commonly used nailing tool. In the existing nail gun technology, in order to ensure effective nailing ability, the designer usually increases the force during the forward work. However, this design brings a significant problem: as the forward force increases, the reaction force also increases, especially during the resetting process. This causes the operator to feel a large recoil and vibration when using the nail gun, and long-term use can easily cause fatigue, affecting work efficiency and operator comfort.

[0004] In order to solve the above problems, patent CN214723919U "Nail gun buffer device and nail gun" proposes an innovative buffer structure, which aims to reduce the recoil and vibration felt by the operator when using the (electric) nail gun. The patent effectively reduces the reaction force generated by the strike block (striker bracket) when working in the forward direction by introducing a gear rack mechanism.

[0005] Although the solution proposed in the above-mentioned existing patent reduces the recoil force to a certain extent, there are some limitations in its design. First, in this patent, since the rack is fixedly connected to the striking block and the striking block needs to move completely along the running direction, the length of the rack must be longer to accommodate the range of motion of the striking block. This results in the need for the gear that matches the rack to have a larger number of teeth to ensure the overall compactness of the structure, reduce the overall volume while ensuring the continuity and stability of the transmission, thereby increasing the precision requirements of the gear and the difficulty of production and processing. Secondly, during use, due to the large number of gear teeth, the gear and the rack must always remain tightly connected, which leads to a significant increase in the friction between the two. The increase in friction not only affects the service life of the gear and the rack, but also reduces the accuracy of the meshing between them. This reduction in accuracy, in turn, affects the nail gun's anti-recoil effect.

[0006] In summary, although the existing nail gun buffer device has made certain progress in reducing recoil force, its design still needs to be further optimized and improved in terms of reducing production costs, reducing vibration and improving operating comfort. Utility Model Content

[0007] The purpose of the utility model is to solve the above problems existing in the prior art and to provide a linear motion tool.

[0008] The purpose of the utility model is achieved through the following technical solutions:

[0009] A linear motion tool comprises a casing, in which a linear motor and an output assembly for receiving the power of the linear motor are arranged, wherein the output assembly comprises an output bracket and an output working member fixed to each other; an energy storage mechanism and a reaction force mechanism are also arranged in the casing; the energy storage mechanism comprises a reset spring and an energy storage spring; the reaction force mechanism comprises a fixed rack fixed in the casing, a sliding rack arranged between the reset spring and the energy storage spring, and a gear meshing with the fixed rack and the sliding rack; when the output assembly is in a forward working state, the linear motor drives the output assembly to move to a first extreme position, and the spring force of the energy storage mechanism is superimposed on the driving force of the linear motor to enhance the forward working of the output working member; when the output assembly is in a return state, the linear motor drives the output assembly to move to a second extreme position, the energy storage mechanism stores energy, and the sliding rack moves to the second extreme position relative to the fixed rack, at which time the force of the fixed rack on the casing is opposite to the force of the energy storage spring on the casing.

[0010] Preferably, an inner bracket is also provided in the casing; the fixed rack is limited on the inner bracket, the first end of the reset spring is connected to the force-bearing end of the inner bracket, and the second end is connected to the sliding rack; the first end of the energy storage spring is connected to the sliding rack, and the second end is abutted against the output assembly.

[0011] Preferably, a guide piece is provided inside the inner bracket, and the return spring and the energy storage spring are sleeved with the guide piece; the guide piece is parallel to the output working piece; and the linear motor drives the output bracket to move axially along the guide piece.

[0012] Preferably, there are two guide members, and the sliding racks are slidably arranged on the two guide members.

[0013] Preferably, a lock-release trigger mechanism is also provided in the housing; the lock-release trigger mechanism is activated to release the output component; the lock-release trigger mechanism includes a contact switch provided in the handle portion of the housing and a trigger movable relative to the contact switch; the trigger moves relative to the handle portion and abuts against or moves away from the contact switch to trigger the start and stop of the linear motor.

[0014] Preferably, the reaction force mechanism may also be replaced by a lever or a pulley mechanism.

[0015] Preferably, a pivot is provided in the middle part of the lever, and the pivot is fixedly provided on the housing or the inner bracket, the force-bearing end of the lever rotates around the pivot, and the reaction end of the lever rotates in the opposite direction around the pivot to reduce the force applied by the return spring and the energy storage spring.

[0016] Preferably, the power end of the linear motor is connected to the output bracket via a transmission rod.

[0017] Preferably, the reaction mechanism comprises two fixed racks and the gear, and the sliding rack is a double-tooth structure, which is meshed with the fixed rack through one of the gears respectively.

[0018] Preferably, the fixed rack is limited to the housing, the first end of the return spring is connected to the force-bearing end of the housing, and the second end is connected to the sliding rack; the first end of the energy storage spring is connected to the sliding rack, and the second end abuts against the output assembly.

[0019] The advantages of the technical solution of the utility model are mainly reflected in:

[0020] The reaction mechanism can offset or nearly offset the forces of the energy storage spring force and the return spring force on the whole machine, thereby obtaining the minimum vibration impact, reducing the recoil and vibration, as well as the fatigue caused during use, and improving work efficiency and comfort;

[0021] The spring force of the energy storage mechanism is superimposed on the positive force of the linear motor, which increases the positive working force and working speed, shortens the working time, and improves the working efficiency and frequency. At the same time, the return energy storage function of the linear motor reduces the energy supply for the positive working of the linear motor, which can reduce the output force of the linear motor by 15%-50%, and indirectly reduce the corresponding volume and cost.

[0022] The linear motor can be started through the lock-release trigger mechanism before the output bracket can be triggered to move in the casing, effectively preventing the linear motion tool from being started due to accidental touch, thereby improving the safety of the entire machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 : A cross-sectional view of the first embodiment of the utility model in the first direction of the initial state;

[0024] Figure 2 : A cross-sectional view of the first embodiment of the utility model in the initial state in the second direction;

[0025] Figure 3 : A first directional cross-sectional view of the return state of the first embodiment of the utility model;

[0026] Figure 4 : A cross-sectional view in the second direction of the return state of the first embodiment of the utility model;

[0027] Figure 5 : A three-dimensional diagram of the internal structure of the first embodiment of the utility model in the first direction;

[0028] Figure 6 : A second directional stereoscopic view of the internal structure of the first embodiment of the utility model;

[0029] Figure 7 : A cross-sectional view in the first direction of the initial state of the second embodiment of the utility model. DETAILED DESCRIPTION

[0030] The purpose, advantages and features of the present invention will be illustrated and explained through the non-limiting description of the following preferred embodiments. These embodiments are only typical examples of the application of the technical solution of the present invention, and any technical solution formed by equivalent replacement or equivalent transformation falls within the scope of protection claimed by the present invention.

[0031] like Figure 1 or Figure 3 As shown, the utility model discloses a linear motion tool, including a housing 1, in which an inner bracket 11, a linear motor 2 and an output assembly 4 receiving power from the linear motor 2 are arranged. The output assembly 4 includes an output bracket 40 and an output working member 41 fixed to each other; further, the power end of the linear motor 2 is connected to the output bracket 40 through a transmission rod 3; that is, after the linear motor 2 is started, the output bracket 40 is driven by the transmission rod 3 to reciprocate along the axial direction of the inner bracket 11, thereby driving the output working member 41 to work in a forward or reverse direction, thereby realizing a linear output action including nailing.

[0032] like Figures 1 to 4 As shown, the housing 1 is also provided with an energy storage mechanism 5 and a reaction mechanism 8. Further, the energy storage mechanism 5 and the reaction mechanism 8 are provided in an inner bracket 11, and a guide member 53 is provided inside the inner bracket 11. Figure 1 or Figure 2 or Figure 4 As shown, the energy storage mechanism 5 includes a reset spring 51 and an energy storage spring 52; and the reset spring 51 and the energy storage spring 52 are sleeved with the guide member 53. The guide member 53 is parallel to the output working member 41; the linear motor 2 drives the output bracket 40 to move axially along the guide member 53. Further, there are two guide members 53, and each of the guide members 53 is sleeved with the reset spring 51 and the energy storage spring 52.

[0033] Combination Figure 1 , Figure 3 , Figure 5 and Figure 6In the first embodiment shown, the reaction mechanism 8 includes a fixed rack 81 fixed in the housing 1, a sliding rack 82 disposed between the return spring 51 and the energy storage spring 52, and a gear 83 meshing with the fixed rack 81 and the sliding rack 82. The sliding rack 82 is disposed on two guide members 53.

[0034] When the output assembly 4 is in the forward working state, the linear motor 2 drives the output assembly 4 to move along the first limit position, and the spring force of the energy storage mechanism 5 is superimposed on the driving force of the linear motor 2 to enhance the forward work of the output working member 41. When the output assembly 4 is in the return state, the linear motor 2 drives the output assembly 4 to move to the second limit position, the energy storage mechanism 5 stores energy, and the sliding rack 82 moves to the second limit position relative to the fixed rack 81. At this time, the force of the fixed rack 81 on the housing 1 is opposite to the force of the energy storage spring 52 on the housing 1.

[0035] like Figure 1 and Figure 3 As shown, the fixed rack 81 is limited on the inner bracket 11; the first end of the reset spring 51 is connected to the force-bearing end of the inner bracket 11, and the second end is connected to the sliding rack 82; the first end of the energy storage spring 52 is connected to the sliding rack 82, and the second end is in contact with the output assembly 4. The reset spring 51 and the fixed rack 81 can be directly fixedly connected to the inner bracket 11, or fixedly connected to the housing 1, which is not limited here.

[0036] Furthermore, the force applied by the return spring 51 to the sliding rack 82 is marked as F1, and the force applied by the energy storage spring 52 to the sliding rack 82 is marked as F2. When working in the forward direction, the energy storage spring 52 is driven by the linear motor 2 to be gradually released, so that F2 is gradually reduced. When F2 is reduced to less than F1, the return spring 51 will drive the sliding rack 82 to move to the first limit position until the return spring 51 is completely released, that is, F1=F2=0. When working in the reverse direction, the energy storage spring 52 is driven by the linear motor 2 to be gradually contracted, so that F2 is gradually increased. When F2 increases to be greater than F1, the energy storage spring 52 will drive the sliding rack 82 to move to the second limit position until the return spring 51 is completely contracted, that is, the energy storage spring 51 and the return spring 51 are both in the energy storage state.

[0037] When doing work in the forward direction and resetting, the sliding rack 82 is driven to move back and forth by the reset spring 51 and the energy storage spring 52, reducing its moving stroke, thereby reducing the number of teeth of the gear 83 to reduce the processing difficulty and accuracy; at the same time, the friction between the gear 83 and the fixed rack 81 and the sliding rack 82 is reduced, the service life is extended, and the vibration generated during use is further reduced.

[0038] The reaction mechanism 8 can also be replaced by a lever or a pulley mechanism. The lever structure is as follows: a pivot is provided in the middle of the lever, and the pivot is fixedly provided on the housing 1 or the inner bracket 11. The force-bearing end of the lever rotates around the pivot, and the reaction end of the lever rotates in the opposite direction around the pivot to reduce the force applied by the return spring 51 and the energy storage spring 52.

[0039] like Figure 1 or Figure 3 As shown, a lock release trigger mechanism 7 is also provided in the housing 1; the lock release trigger mechanism 7 is activated to release the output assembly 4. The lock release trigger mechanism 7 includes a contact switch 71 provided in the handle portion 12 of the housing 1 and a trigger 72 that can move relative to the contact switch 71. The trigger 72 moves relative to the handle portion 12 and abuts against or moves away from the contact switch 71 to trigger the start and stop of the linear motor 2.

[0040] The second embodiment Figure 7 As shown, the difference between this embodiment and the first embodiment is that there are two fixed racks 81, which are arranged opposite to each other and mesh with the sliding rack 82 through the gear 83. The sliding rack 82 is preferably a double-tooth structure in this embodiment, and in other embodiments, the sliding rack 82 can also be two single-tooth structures, and the two sliding racks 82 with single-tooth structures are arranged opposite to each other. In this embodiment, the two reverse mechanisms 8 are symmetrically arranged to balance the force of the linear motion tool, and the use process is more stable.

[0041] The working process of the utility model is briefly described below:

[0042] S1, in an initial state, the energy storage mechanism 5 and the output assembly 4 are at the output end; the trigger 72 of the lock-release trigger mechanism 7 abuts against the contact switch 71, and the linear motor 2 is started.

[0043] S2, the linear motor 2 is energized in reverse to drive the output assembly 4 to enter the return state; the output assembly 4 drives the energy storage mechanism 5 to store energy to the second extreme position until the output assembly 4 is in the second extreme position. At this time, the force of the fixed rack 81 on the housing 1 is opposite to the force of the energy storage spring 52, so as to reduce the vibration of the whole machine. In this process, the force F2 applied by the energy storage spring 52 in the energy storage mechanism 5 to the sliding rack 82 gradually increases until F2 is greater than the force F1 applied by the return spring 51 in the energy storage mechanism 5 to the sliding rack 82. The energy storage spring 52 drives the sliding rack 82 and the return spring 51 to move to the second extreme position until the energy storage mechanism 5 is completely contracted and is in the energy storage state.

[0044] S3, the linear motor 2 is energized in the forward direction, driving the output assembly 4 to enter the forward working state; at the same time, the spring force of the energy storage mechanism 5 is superimposed to push the output assembly 4 to the first limit position. In this process, the force F2 applied by the energy storage spring 52 to the sliding rack 82 gradually decreases until F2 is less than the force F1 applied by the return spring 51 to the sliding rack 82, and the return spring 51 drives the sliding rack 82 and the energy storage spring 52 to move to the first limit position until the energy storage mechanism 5 is completely released.

[0045] S4, the linear motor 2 drives the output assembly 4 to superimpose the spring force of the energy storage mechanism 5 to move to the first limit position, completes the final work requirement, and realizes a working cycle.

[0046] All technical solutions formed by equivalent transformation or equivalent transformation also fall within the protection scope of the present utility model.

Claims

1. A linear motion tool, comprising a housing (1), wherein a linear motor (2) and an output assembly (4) for receiving power from the linear motor (2) are arranged in the housing (1), wherein the output assembly (4) comprises an output bracket (40) and an output working member (41) fixed to each other; characterized in that: An energy storage mechanism (5) and a reaction mechanism (8) are also provided in the housing (1); the energy storage mechanism (5) comprises a reset spring (51) and an energy storage spring (52); the reaction mechanism (8) comprises a fixed rack (81) fixed in the housing (1), a sliding rack (82) provided between the reset spring (51) and the energy storage spring (52), and a gear (83) meshing with the fixed rack (81) and the sliding rack (82); when the output component (4) is in a forward working state, the linear motor (2) drives the output component (4) toward the first pole The output assembly (4) moves to a second limit position, and the spring force of the energy storage mechanism (5) is superimposed on the driving force of the linear motor (2) to enhance the positive work of the output working member (41); when the output assembly (4) is in a return state, the linear motor (2) drives the output assembly (4) to move to a second limit position, the energy storage mechanism (5) stores energy, and the sliding rack (82) moves to the second limit position relative to the fixed rack (81). At this time, the force exerted on the housing (1) by the fixed rack (81) is opposite to the force exerted on the housing (1) by the energy storage spring (52).

2. The linear motion tool according to claim 1, characterized in that: An inner bracket (11) is also provided in the housing (1); the fixed rack (81) is limited on the inner bracket (11); a first end of the return spring (51) is connected to a force-bearing end of the inner bracket (11), and a second end is connected to the sliding rack (82); a first end of the energy storage spring (52) is connected to the sliding rack (82), and a second end is in contact with the output assembly (4).

3. The linear motion tool according to claim 2, characterized in that: A guide member (53) is provided inside the inner bracket (11); the return spring (51) and the energy storage spring (52) are sleeved with the guide member (53); the guide member (53) is parallel to the output working member (41); and the linear motor (2) drives the output bracket (40) to move axially along the guide member (53).

4. The linear motion tool according to claim 3, characterized in that: There are two guide members (53), and the sliding racks (82) are slidably arranged on the two guide members (53).

5. The linear motion tool according to claim 1, characterized in that: A lock-release trigger mechanism (7) is also provided in the housing (1); the lock-release trigger mechanism (7) is activated to release the output component (4); the lock-release trigger mechanism (7) comprises a contact switch (71) provided in a handle portion (12) of the housing (1) and a trigger (72) movable relative to the contact switch (71); the trigger (72) moves relative to the handle portion (12) and abuts against or moves away from the contact switch (71) to trigger the linear motor (2) to start or stop.

6. The linear motion tool according to claim 1, characterized in that: The reaction force mechanism (8) may also be replaced by a lever or a pulley mechanism.

7. The linear motion tool according to claim 6, characterized in that: A pivot is provided in the middle portion of the lever, and the pivot is fixedly provided on the housing (1) or the inner bracket (11). The force-bearing end of the lever rotates around the pivot, and the reaction end of the lever rotates in the opposite direction around the pivot to reduce the force applied by the return spring (51) and the energy storage spring (52).

8. The linear motion tool according to claim 1, characterized in that: The power end of the linear motor (2) and the output bracket (40) are connected via a transmission rod (3).

9. The linear motion tool according to claim 1, characterized in that: The reaction force mechanism (8) comprises two fixed racks (81) and the gear (83); the sliding rack (82) is a double-tooth structure and is meshed with the fixed rack (81) via one of the gears (83).

10. The linear motion tool according to claim 9, characterized in that: The fixed rack (81) is limited to the housing (1); the first end of the return spring (51) is connected to the force-bearing end of the housing (1), and the second end is connected to the sliding rack (82); the first end of the energy storage spring (52) is connected to the sliding rack (82), and the second end is in contact with the output assembly (4).

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