Portable electrically-driven nail gun and parallel charging system thereof

Abstract

The utility model discloses a portable electric drive nail gun and a parallel charging system thereof, the nail gun is configured to give nailing kinetic energy through discharging of a capacitor to a coil, the parallel charging system is used for charging the capacitor, and the parallel charging system at least comprises a control module, an energy storage module, at least two rectifier modules and at least two transformers; the energy storage module is configured to output low-voltage direct current to the primary side of each transformer, and electric energy on the primary side of each transformer is controlled by a switch of the control module to form chopped waves, so that each transformer boosts the output voltage of the energy storage module to target voltage. And the secondary sides of the transformers are rectified by a rectifier module and then are connected in parallel to be output to charge a capacitor. According to the utility model, the size of the space occupied by the transformer can be reduced in at least one direction under the same output power as that of a single transformer, the flexibility of the structural design of the nail gun is improved, and the portable design of the electrically driven nail gun is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of nail guns, in particular to a portable electric nail gun and a parallel charging system thereof. Background Art

[0002] A nail gun is a common nailing device, including electromagnetic nail guns, pneumatic nail guns, mechanical nail guns, etc. Among them, electromagnetic nail guns can provide relatively large driving force and are suitable for driving large nails. Patent 201520580802.4 discloses an electromagnetic nail gun, which first converts the direct current of a battery pack into high-frequency alternating current, and then converts it into high-voltage direct current through a transformer to charge the capacitor. After the capacitor is fully charged, the electromagnetic effect is triggered by discharging the coil to drive the nail.

[0003] However, since nail guns are usually used to drive large nails, the capacitor capacity is generally high, and the transformer specifications required are usually relatively high. The length, width and height of the transformer are positively correlated with its output power. If the output power of the transformer is to be increased and the charging speed of the capacitor is to be increased, the length, width and height of the transformer must be increased accordingly. Therefore, the size of the nail gun in the above patent will be larger, and the portability of the nail gun will be biased; unless a transformer with lower power is selected, the size of the nail gun can be reduced and the portability of the nail gun can be improved, but the charging speed will be reduced as a result. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a portable electric nail gun and a parallel charging system thereof, which can reduce the size of the space required to be occupied by the transformer in at least one direction while achieving the same output power as a single transformer, thereby improving the flexibility of the nail gun structural design and contributing to the portable design of the electric nail gun.

[0005] In order to solve the above technical problems, the utility model discloses a parallel charging system for a portable electric nail gun in the first aspect, wherein the nail gun is configured to impart nailing kinetic energy by discharging a capacitor to a coil, and the parallel charging system is used to charge the capacitor, wherein:

[0006] The parallel charging system comprises at least a control module, an energy storage module, at least two rectifier modules and at least two transformers;

[0007] The energy storage module is configured to output low-voltage direct current to the primary side of each transformer. The electric energy on the primary side of each transformer is chopped by the switch control of the control module so that each transformer raises the output voltage of the energy storage module to the target voltage. The secondary side of each transformer is rectified by a rectifier module and connected in parallel to be output together to charge the capacitor.

[0008] As an optional implementation, in the first aspect of the utility model, each of the transformers is of the same specification.

[0009] As another optional implementation, in the first aspect of the utility model, the energy storage module is formed by high discharge rate batteries connected in series and / or in parallel.

[0010] As another optional implementation, in the first aspect of the present utility model, the target voltage is 450-550V.

[0011] As another optional implementation, in the first aspect of the present utility model, the capacitor is formed by connecting a plurality of capacitors in parallel.

[0012] As another optional implementation, in the first aspect of the utility model, the sum of the output powers of all the transformers is 500W-800W.

[0013] As another optional implementation, in the first aspect of the utility model, the low voltage DC is 12-72V.

[0014] As another optional implementation, in the first aspect of the utility model, the capacity of the capacitor is 500-3000 μF, and the rated voltage is 450-600V.

[0015] The second aspect of the utility model discloses a portable electric nail gun, comprising the parallel charging system as described in the first aspect of the utility model.

[0016] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0017] Compared with the existing single transformer solution, the embodiment of the utility model can reduce the size of the space required for the transformer in at least one direction while achieving the same output power as a single transformer by designing at least two parallel transformers, thereby improving the flexibility of the nail gun structural design and facilitating the portable design of the electric nail gun. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a structural schematic diagram of a capacitor charging circuit of a parallel charging system of a portable electric nail gun disclosed in an embodiment of the utility model;

[0020] Figure 2It is a structural schematic diagram of a PWM chip of a parallel charging system of a portable electric nail gun disclosed in an embodiment of the utility model;

[0021] Figure 3 It is a structural schematic diagram of a control chip of a parallel charging system of a portable electric nail gun disclosed in an embodiment of the utility model;

[0022] Figure 4 The utility model discloses a schematic diagram of a power supply circuit of a parallel charging system of a portable electric nail gun. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] Embodiment 1

[0025] See also Figure 1-4 , the utility model embodiment discloses a parallel charging system for a portable electric nail gun, the nail gun is configured to impart nailing kinetic energy by discharging a capacitor to a coil, and the parallel charging system is used to charge the capacitor;

[0026] The parallel charging system at least includes a control module, an energy storage module, and at least two rectifier modules B ( Figure 1 It includes three rectifier modules B1, B2, B3) and at least two transformers A ( Figure 1 It includes three transformers A1, A2, A3);

[0027] The energy storage module is configured to output low-voltage direct current to the primary side of each transformer. The electric energy on the primary side of each transformer is chopped by the switch control of the control module so that each transformer raises the output voltage of the energy storage module to the target voltage. The secondary side of each transformer is rectified by a rectifier module and connected in parallel to be output together to charge the capacitor.

[0028] The control module includes a PWM chip and a control chip. Figure 2 , Figure 3 . Figure 4 The power supply circuit for the PWM chip and the control chip transforms the 24V input power supply into 5V and 15V, of which 15V is used to supply power to the PWM chip and 5V is used to supply power to the control chip.

[0029] For an example, see Figure 1 , Figure 1 The voltage of capacitor C4 in the circuit will drop to about 230V after discharge at the maximum discharge power. A high discharge rate battery or a high discharge rate battery pack is used to output 24V low voltage DC to the primary side of three transformers A1, A2, and A3, and the secondary sides of the three transformers are connected in parallel. The specifications of the three transformers are consistent, and all of them boost 24V to 450-550V, that is, the turns ratio of each transformer is about 1:20. At the same time, the output power of each transformer is 300W, and the length, width, and height dimensions are all 30×25×30mm, that is, the capacitor C4 is charged from 230V to 450-550V at three times the output current, with a faster charging speed. For the existing single transformer step-up method, the length, width and height of the transformer are positively correlated with its output power. If the output power of the transformer is to be increased, its length, width and height dimensions must be increased accordingly. If the power output by the three transformers in this example is to be achieved, its length, width and height dimensions must be 50×45×45mm. The larger dimensions will make the nail gun inconvenient to carry. If the transformer is placed in the hand grip area of ​​the nail gun, it will be difficult to hold and use. The optimal diameter range for human hands to hold varies from person to person. Generally speaking, for most adults, the optimal diameter range for holding is between 25mm and 45mm. Within this range, the human hand can naturally wrap around the object and maintain a stable grip strength. At the same time, it will not cause discomfort or pain due to excessive or too small diameter. For this example, the transformer, which is at least 45mm wide, can be reduced to 30mm wide. With the addition of a few millimeters of casing thickness, the size of the nail gun grip area will be easily kept within 45mm, which is within the optimal size range for human hands to hold. Through different stacking or arrangement methods, the three transformers in this example can always reduce the size of the space required for the transformer as a whole in at least one direction, making the design of the nail gun flexible and facilitating the portable design of the electric nail gun. Compared with the solution of a single transformer, the embodiment of the utility model can reduce the size of the space required for the transformer in at least one direction while achieving the same output power as a single transformer by designing at least two transformers in parallel, thereby improving the flexibility of the nail gun structural design and facilitating the portable design of the electric nail gun.

[0030] In an optional embodiment, each of the transformers is of the same specification; when the charging power of the capacitor needs to be increased, the number of transformers can be directly increased, which is easy to improve and repair, and the consistent size also facilitates the structural design of the nail gun.

[0031] In yet another optional embodiment, the low voltage DC is 12-72V.

[0032] In yet another optional embodiment, the energy storage module is formed by high discharge rate batteries connected in series and / or in parallel.

[0033] In yet another optional embodiment, the target voltage is 450-550V.

[0034] In yet another optional embodiment, the capacitor is formed by connecting a plurality of capacitors in parallel.

[0035] In yet another optional embodiment, the sum of the output powers of all the transformers is 500-800W.

[0036] In yet another optional embodiment, the capacity of the capacitor is 500-3000 μF, and the rated voltage is 450-600V.

[0037] Embodiment 2

[0038] A portable electric nail gun comprises the parallel charging system as described in the first embodiment.

[0039] The contents disclosed in the embodiments of the present invention only disclose the preferred embodiments of the present invention, which are only used to illustrate the technical solutions of the present invention, rather than to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it should be understood by those skilled in the art that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A parallel charging system for a portable electric nail gun, wherein the nail gun is configured to impart nailing kinetic energy by discharging a capacitor to a coil, and the parallel charging system is used to charge the capacitor, characterized in that: The parallel charging system comprises at least a control module, an energy storage module, at least two rectifier modules and at least two transformers; The energy storage module is configured to output low-voltage direct current to the primary side of each transformer. The electric energy on the primary side of each transformer is chopped by the switch control of the control module so that each transformer raises the output voltage of the energy storage module to the target voltage. The secondary side of each transformer is rectified by a rectifier module and connected in parallel to be output together to charge the capacitor.

2. The parallel charging system according to claim 1, characterized in that: Each of the transformers has the same specification.

3. The parallel charging system according to claim 2, characterized in that: The energy storage module is formed by connecting high discharge rate batteries in series and / or in parallel.

4. The parallel charging system according to claim 1, characterized in that: The target voltage is 450-550V.

5. The parallel charging system according to claim 1, characterized in that: The capacitor is formed by connecting a plurality of capacitors in parallel.

6. The parallel charging system according to claim 1, characterized in that: The sum of the output powers of all the transformers is 500W-800W.

7. The parallel charging system according to claim 1, characterized in that: The low voltage direct current is 12-72V.

8. The parallel charging system according to claim 1, characterized in that: The capacity of the capacitor is 500-3000 μF, and the rated voltage is 450-600V.

9. A portable electric nail gun, characterized in that: Comprising a parallel charging system as described in any one of claims 1-8.

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