Permanent magnet brushless dual-motor composite drilling, punching and screwing multi-functional switching combined hardware tool

Abstract

A permanent magnet brushless dual-motor composite drilling, punching and screwing multifunctional switchable combination hardware tool comprises an impact output mechanism, a rotation output mechanism, a function switching mechanism and a drill bit quick-change mechanism; a power unit is composed of an impact motor of the impact output mechanism and a rotation motor of the rotation output mechanism, which respectively provide power for impact motion and rotation motion, and both motions are output by the output shaft; when the rotation or impact function is used, the chuck is connected to the drill bit or bolt head through the function switching mechanism; the present invention adopts the principle of decentralized multi-power and utilizes dual motors as dual power sources to achieve multiple function switching and precise control of parameters such as rotation speed and impact frequency, thereby realizing multiple functions under various working conditions.

Description

Technical Field

[0001] The invention belongs to the technical field of hardware tools, and in particular relates to a permanent magnet brushless dual-motor composite drilling, punching and screwing multifunctional switchable combined hardware tool. Background Art

[0002] In the field of metal machining, existing drilling tools only have drilling functions and use a single power source, resulting in high drilling force, poor chip removal, severe heat generation, difficulty in lubricating fluid entering the drilling area, and the drill bit being unable to automatically clamp and release.

[0003] In the fields of automobiles, home appliances, aerospace, rail vehicle electrical systems and track sleeper clamping, power system high-voltage towers, etc., there is an urgent need for automatic control of constant torque in the bolt tightening process. However, the current thread tightening devices are too large or cannot achieve automatic tightening function. There is an urgent need to develop a device that can automatically clamp the bolt head and achieve constant torque.

[0004] In the interior decoration of buildings, it is often necessary to drill holes in concrete walls. For concrete, tile walls, brick walls, earth walls, and marble walls with different strengths, the drilling efficiency is low when the same impact frequency is used for impact drilling. Sometimes, special electric tools such as tile walls and marble walls are also required. Therefore, there is an urgent need to develop hardware tools suitable for different walls that can automatically adjust the impact frequency.

[0005] In the current wooden furniture manufacturing process, drilling and thread tightening use impact drills that cannot adjust speed and torque. It is difficult to achieve ideal processing effects for different drilling depths and different wood hardness conditions, which may lead to poor drilling quality or bolts being screwed out. Therefore, there is an urgent need to develop hardware tools with adjustable speed and torque that are suitable for different wood types and processing conditions.

[0006] In summary, the hardware tools on the market that have impact and drilling functions use the same motor as the power source, which has the following shortcomings: (1) The drilling speed and impact frequency cannot be reasonably matched and adjusted according to the object to be processed. It is a fixed combination, resulting in low impact drill efficiency and even the production of defective drilled products. In addition, the existing impact drill cannot realize a separate impact function, resulting in some bolts being unable to be loosened due to rust in practice. For these rusted bolts, the separate impact vibration loosening function cannot be realized. (2) The impact frequency of a single power source cannot be adjusted, and when the cam is subjected to axial impact from the drill bit, the cam is severely worn and noisy. The crank slider type axial impact mechanism has a complex structure and high power consumption. (3) Existing hardware tools with drilling impact function do not have a constant torque tightening function for bolts. (4) For impact chucks, all electric hardware tools require the operator to manually replace the drill bit or bolt head using an external tool, and cannot automatically clamp or loosen. For situations where replacement is difficult or the drill bit or bolt head needs to be replaced frequently, this method is inefficient and even difficult to implement. Summary of the Invention

[0007] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the present invention is to provide a permanent magnet brushless dual-motor composite drilling, punching and screwing multi-function switchable combination hardware tool. By using the principle of decentralized multi-power and utilizing dual motors as dual power sources, it can realize multiple function switching and precise control of parameters such as rotation speed and impact frequency, and can realize multiple functions under various working conditions.

[0008] In order to achieve the above object, the technical solution adopted by the present invention is:

[0009] A permanent magnet brushless dual-motor composite drilling, punching and screwing multifunctional switchable combination hardware tool includes an impact output mechanism and a rotation output mechanism, a function switching mechanism and a drill bit quick change mechanism; the power device is composed of an impact motor 17 of the impact output mechanism and a rotation motor 24 of the rotation output mechanism, which provide power for impact movement and rotation movement respectively, and both movements are output by the output shaft 6; when using the rotation or impact function, the chuck 1 is connected to the drill bit 40 through the function switching mechanism.

[0010] The impact output mechanism includes an impact motor 17, which is installed in a hardware tool housing 39. The impact motor 17 is connected to an impact shaft 15. Both ends of the impact shaft 15 are fixed to the hardware tool housing 39 through a first deep groove ball bearing 11 and a sixth deep groove ball bearing 20. The impact shaft 15 is connected to a cam 13. The outer side of the cam 13 is matched with a universal ball bearing 10. The universal ball bearing 10 is connected to the tail end of the output shaft 6. The output shaft 6 is fixed to the hardware tool housing 39 through a second deep groove ball bearing 8. The front end of the output shaft 6 is connected to the chuck 1; the universal ball bearing 10 is pressed against the fixed surface of the hardware tool housing 39 by a spring 9, and the return stroke of the universal ball bearing 10 is achieved by the spring 9.

[0011] The tail end of the impact motor 17 is provided with an impact motor cooling fan 18 which is axially fixed by a second steel wire retaining ring 19 .

[0012] The rotary output mechanism includes a rotary motor 24, which is installed in a hardware tool housing 39. The rotary motor 24 is connected to a rotary shaft 28, and both ends of the rotary shaft 28 are fixed to the hardware tool housing 39 through a third deep groove ball bearing 21 and a fourth deep groove ball bearing 37; the rotary shaft 28 is connected to a first pinion 30 and a second pinion 35 respectively through a first needle roller bearing 29 without inner and outer rings and a second needle roller bearing 36 without inner and outer rings installed thereon; the first pinion 30 and the second pinion 35 are meshed with a first large gear 5 and a second large gear 2, the first large gear 5 is connected to the output shaft 6, and the second large gear 2 is connected to the output shaft 6 through a fifth deep groove ball bearing 3.

[0013] The tail end of the rotating motor 24 is provided with a rotating motor cooling fan 23 which is axially positioned on the rotating shaft 28 through a third steel wire retaining ring 22 .

[0014] The function switching mechanism includes a shift fork 32 and a sliding switch 33. The shift fork 32 is mounted on the hardware tool housing 39 and can slide back and forth to cooperate with the sliding switch 33. The sliding switch 33 is connected to the rotating shaft 28 and rotates with the rotating shaft 28. By adjusting the position of the shift fork 32, the first pinion 30 or the second pinion 35 of the transmission is selected through the sliding switch 33 to complete the function switching.

[0015] The cam 13 includes 6 push segments and return segments per revolution. When matched with the universal ball bearing 10, the push and return motion angles are both 30°. In addition, the displacement curve in the motion law curve of the cam 13 is selected as a cosine curve, and the acceleration curve is also a cosine curve. Each segment of the acceleration curve is connected end to end to form a complete smooth curve. There is no rigid impact between the universal ball bearing 10 and the cam 13.

[0016] The large ball at the top of the universal ball bearing 10 is placed in a groove, and the groove is filled with small balls. The large ball can roll freely in any direction above the small balls, and the universal ball bearing 10 can withstand large axial forces.

[0017] The impact motor 17 and the rotary motor 24 are permanent magnet brushless motors.

[0018] The hardware tool housing 39 is a structure in which two parts, left and right, are spliced and installed. Each groove portion in the hardware tool housing 39 is used to install and limit corresponding parts.

[0019] Compared with the existing technology, the present invention adopts decentralized multi-power technology to achieve multi-function switching, which has the following advantages:

[0020] (1) The rotation speed and impact frequency can be reasonably matched and adjusted according to the object to be processed, and the working conditions required by various working conditions can be combined to achieve better drilling and impact effects on working surfaces of different materials. At the same time, the impact function can be realized independently to complete tasks such as impact vibration loosening of rusted bolts.

[0021] (2) Driven by dual motors, the impact frequency can be adjusted independently. The impact transmission mechanism is designed as a cam-universal ball bearing. The acceleration curve of the cam is a cosine curve, which does not have a rigid impact. The universal ball bearing can withstand large axial forces and is less affected by friction. Its structural principle is simple and its service life is longer.

[0022] (3) Driven by dual motors, the torque and speed of the rotational motion can be controlled independently, which helps to achieve constant torque rotation when tightening bolts.

[0023] (4) By using the shift fork and the sliding switch, the working mode of clamping and loosening the chuck can be switched conveniently, and the replacement of the drill bit or the bolt head can be completed automatically, which effectively reduces the difficulty and intensity of the operator's work in a complex working environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the transmission structure of the present invention.

[0025] Figure 2 It is an exploded view of the internal parts of the present invention.

[0026] Figure 3 It is a two-dimensional diagram of the cam of the present invention and its motion law curve.

[0027] Figure 4 This is an assembly diagram of the shell of the multifunctional hardware tool of the present invention and a diagram of the interior of the shell. DETAILED DESCRIPTION

[0028] The present invention is described in detail below with reference to the embodiments and accompanying drawings.

[0029] like Figure 1 and Figure 2 As shown, a permanent magnet brushless dual-motor composite drilling, punching and screwing multifunctional switchable combination hardware tool includes an impact output mechanism and a rotation output mechanism, a function switching mechanism and a drill bit quick change mechanism; the power device is composed of an impact motor 17 of the impact output mechanism and a rotation motor 24 of the rotation output mechanism, which provide power for impact movement and rotation movement respectively, and both movements are output by the output shaft 6; when using the rotation or impact function, the chuck 1 is connected to the drill bit 40 through the function switching mechanism.

[0030] like Figure 2 As shown, the impact output mechanism includes an impact motor 17, which is installed in a hardware tool housing 39. The impact motor 17 is connected to the impact shaft 15 through a first flat key 16. Both ends of the impact shaft 15 are fixed to the hardware tool housing 39 through a first deep groove ball bearing 11 and a sixth deep groove ball bearing 20. The impact shaft 15 is connected to the cam 13 through a fourth flat key 14. The cam 13 is further axially positioned by a first wire retaining ring 12 on the groove of the impact shaft 15. The outer side of the cam 13 is matched with a universal ball bearing 10; the universal ball bearing 10 is connected to the tail end of the output shaft 6 through a thread, and the output shaft 6 is fixed to the hardware tool housing 39 through a second deep groove ball bearing 8 to complete axial and radial limiting. The front end of the output shaft 6 is screwed with the chuck 1 The impact motor cooling fan 18 is axially positioned through the second steel wire retaining ring 19 on the groove of the impact shaft 15; when performing the impact movement, the impact shaft 15 is driven to rotate by the impact motor 17, and then the cam 13 is driven to rotate so that the universal ball bearing 10 pushes the output shaft 6 to complete the impact movement, wherein the universal ball bearing 10 acts as a roller follower, which greatly reduces the wear during the movement; the rotation of the cam 13 can make the follower produce reciprocating linear motion; the universal ball bearing 10 is pressed against the fixed surface of the hardware tool housing 39 by the spring 9, and the return stroke of the universal ball bearing 10 is realized by the spring 9. When the universal ball bearing 10 is displaced, the spring 9 is compressed, and the force generated by the spring 9 will always push the follower against the cam 13 to make it return.

[0031] like Figure 2As shown, the rotary output mechanism includes a rotary motor 24, which is installed in a hardware tool housing 39. The rotary motor 24 is connected to the rotary shaft 28 through a second flat key 26 and is axially positioned by a fifth wire retaining ring 25 on the groove of the rotary shaft 28; both ends of the rotary shaft 28 are fixed to the hardware tool housing 39 through a third deep groove ball bearing 21 and a fourth deep groove ball bearing 37; the rotary shaft 28 is connected to the first pinion 30 and the second pinion 30 respectively through a first needle roller bearing 29 and a second needle roller bearing 36 installed thereon. The first large gear 5 is connected to the output shaft 6 by the third flat key 7, and the second large gear 2 is connected to the output shaft 6 by the fifth deep groove ball bearing 3. The first large gear 5 and the output shaft 6 are connected and driven by the third flat key 7, and the first large gear 5 is axially positioned by the fourth wire retaining ring 4 fixed on the groove of the output shaft 6.

[0032] The fifth steel wire retaining ring 25 is fixed to the groove on the rotating shaft 28 and axially positions the rotating motor 24. The third steel wire retaining ring 22 is fixed to the groove on the rotating shaft 28 and axially positions the rotating motor cooling fan 23. The rotating motor 24 drives the rotating shaft 28 to rotate, and then drives the second small gear 35 and the second large gear 2 to rotate so that the chuck 1 changes tightness, or drives the first small gear 30 and the first large gear 5 so that the rotational motion is transmitted from the rotating shaft 28 to the output shaft 6, completing the rotational motion of the output shaft 6.

[0033] like Figure 1 and Figure 2As shown, the function switching mechanism includes a shift fork 32 and a sliding switch 33. The shift fork 32 is mounted on the hardware tool housing 39 and can slide back and forth to cooperate with the sliding switch 33. The seventh wire retaining ring 34 and the eighth wire retaining ring 38 are fixed to the rotating shaft 28 through grooves, respectively axially positioning the sliding switch 33 and the fourth deep groove ball bearing 37. The sliding switch 33 is connected to the rotating shaft 28 through the fifth flat key 27 and rotates with the rotating shaft 28 during operation. Adjust the position of the shift fork 32 and select the first pinion 30 or the second pinion 35 of the transmission through the sliding switch 33 to complete the function switching. When the operator pushes the sliding switch 33 to the right through the shift fork 32 , the end face teeth of the sliding switch 33 are engaged with the end face teeth of the second pinion 35, the rotating shaft 28, the sliding switch 33, and the second pinion 35 rotate together, and the first pinion 30 does not move. At this time, the hardware tool is in the automatic clamping working mode of the chuck; similarly, when the sliding switch 33 is pushed, the end face teeth of the sliding switch 33 are engaged with the end face teeth of the first pinion 30, the sliding switch 33 rotates together with the first pinion 30, and the second pinion 35 does not move. At this time, the hardware tool is in the impact rotation working mode; in addition, by adjusting the speed of the impact motor 17 to 0 or the speed of the rotating motor 24 to 0, the hardware tool works in the single rotation working mode or the single impact working mode.

[0034] like Figure 2 and Figure 3 As shown, each turn of the cam 13 includes 6 push segments and return segments. When matched with the universal ball bearing 10, the push and return motion angles are both 30°; and the displacement curve in the motion law curve of the cam 13 is selected as a cosine curve, so its acceleration curve is also a cosine curve. Since the cam motion of the hardware tool is all push and return, each segment of the acceleration curve is connected end to end to form a complete smooth curve, so there is no rigid impact between the universal ball bearing 10 and the cam 13.

[0035] The impact motor 17 and the rotary motor 24 are permanent magnet brushless motors.

[0036] like Figure 4 As shown, the hardware tool housing 39 is a structure in which two parts, left and right, are spliced and installed. Each groove portion in the hardware tool housing 39 is used to install and limit corresponding parts.

[0037] The working principle of the present invention is:

[0038] 1) A multifunctional switchable combination hardware tool, which uses a permanent magnet brushless dual motor to output power. By adjusting the sliding switch 33, multiple gears are combined to adjust the speed of the permanent magnet brushless dual motor. The rotational motion is transmitted through the rotating shaft 28, the output shaft 6, and the gear set, which can meet the different rotation speed requirements of functions such as drilling holes in different materials, rotating and tightening bolt heads, and clamping and loosening chucks.

[0039] When a single drilling function is required, the speed of the impact motor 17 is adjusted to 0, and the shift fork 32 toggles the sliding switch 33 so that it engages with the end face teeth of the first pinion 30, switching to the rotation mode, and the drilling rotation speed is changed by adjusting the speed of the rotation motor 24;

[0040] When a single impact function is required, the speed of the rotary motor 24 is adjusted to 0, and the impact frequency is changed by adjusting the speed of the impact motor 17;

[0041] When the impact and drilling combined function is required, the shift fork 32 toggles the sliding switch 33 to engage with the end face teeth of the first pinion 30, switching to the rotation mode, and adjusting the drilling rotation speed and impact frequency by adjusting the rotation motor 24 and the impact motor 17 respectively;

[0042] When a constant torque tightening function is required, the speed of the impact motor 17 is adjusted to 0, and the constant torque tightening function is achieved by adjusting the speed and torque of the rotary motor 24;

[0043] When the automatic clamping and loosening function of the chuck is required, the fork 32 moves the sliding switch 33 to engage with the end face teeth of the second pinion 35, switching to the automatic clamping mode, and the speed of the impact motor 17 is adjusted to 0. By adjusting the rotation direction of the rotary motor 24, the clamping and loosening function of the drill bit or bolt head is completed.

[0044] 2) An impact output mechanism including a cam 13 and a universal ball bearing 10 (bull's eye bearing) was constructed:

[0045] The multifunctional switchable combination hardware tool drives the impact shaft 15 through the impact motor 17, and finally drives the cam 13 to impact the universal ball bearing 10; wherein the motion law of the cam 13 is the cosine acceleration motion law (simple harmonic motion law), the maximum displacement of the follower of the cam 13 is h, the lift motion angle of the cam 13 is w, the angular velocity of the cam is ω, and the thrust angle is The corner turned is The law of the follower displacement s is determined by formula (1):

[0046]

[0047] The law of the speed v of the driven member is determined by formula (2):

[0048]

[0049] The law of the acceleration speed a of the driven member is determined by formula (3):

[0050]

[0051] It can be seen from formula (3) that the acceleration curve is a cosine curve. Since the cam motion is push stroke and return stroke, each section of the acceleration curve is connected end to end to form a complete smooth curve. There is no rigid impact, so it can be used in high-speed working environments, which can effectively reduce the wear between the universal ball bearing 10 and the cam 13 and extend the service life. At the same time, the large ball on the top of the universal ball bearing 10 is placed in a groove, and the groove is filled with small balls. The large ball can roll freely in any direction on the small ball, and the universal ball bearing 10 can withstand a large axial force, which can further increase the service life and stability of the impact output mechanism.

[0052] 3) Axial impact frequency is independently adjustable:

[0053] The multifunctional switchable combination hardware tool changes the rotation speed of the impact motor 17 by adjusting the shift fork 32 and the sliding switch 33, thereby changing the impact frequency of the cam 13 on the universal ball bearing 10 per unit time.

[0054] 4) A mechanism for switching between rotation and chuck clamping and loosening functions was constructed:

[0055] The multifunctional switching combination hardware tool drives the sliding switch 33 through the fork 32 on the hardware tool housing 39, which can engage with the end face teeth of the front and rear first pinion 30 or the second pinion 35 respectively, and can select the clamping and releasing function of the chuck 1 or the rotation operation of the hardware tool.

[0056] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that modifications or equivalent replacements of the technical solutions of the present invention are all within the scope of protection of the present invention.

Claims

1. A permanent magnet brushless dual motor composite drilling, punching and screwing multifunctional switchable combination hardware tool, characterized by: The invention comprises an impact output mechanism and a rotation output mechanism, a function switching mechanism and a drill bit quick-changing mechanism; a power device is composed of an impact motor (17) of the impact output mechanism and a rotation motor (24) of the rotation output mechanism, which respectively provide power for impact motion and rotation motion, and both motions are output by an output shaft (6); when the rotation or impact function is used, the chuck (1) is connected to the drill bit (40) through the function switching mechanism; The impact output mechanism includes an impact motor (17), the impact motor (17) is installed in the hardware tool housing (39), the impact motor (17) is connected to the impact shaft (15), both ends of the impact shaft (15) are fixed to the hardware tool housing (39) through the first deep groove ball bearing (11) and the sixth deep groove ball bearing (20), the impact shaft (15) is connected to the cam (13), the outer side of the cam (13) is matched with the universal ball bearing (10), the universal ball bearing (10) is connected to the tail end of the output shaft (6), the output shaft (6) is fixed to the hardware tool housing (39) through the second deep groove ball bearing (8), and the front end of the output shaft (6) is connected to the chuck (1); the universal ball bearing (10) is pressed against the fixed surface of the hardware tool housing (39) by the spring (9), and the return stroke of the universal ball bearing (10) is achieved by the spring (9); The rotary output mechanism includes a rotary motor (24), which is installed in a hardware tool housing (39), and the rotary motor (24) is connected to a rotary shaft (28). Both ends of the rotary shaft (28) are fixed to the hardware tool housing (39) through a third deep groove ball bearing (21) and a fourth deep groove ball bearing (37); the rotary shaft (28) is connected to a first pinion (30) and a second pinion (35) through a first needle roller bearing (29) without inner and outer rings and a second needle roller bearing (36) without inner and outer rings installed thereon; the first pinion (30), the second pinion (35) are meshed with a first large gear (5) and a second large gear (2); the first large gear (5) is connected to an output shaft (6), and the second large gear (2) is connected to the output shaft (6) through a fifth deep groove ball bearing (3); The function switching mechanism includes a shift fork (32) and a sliding switch (33). The shift fork (32) is mounted on a hardware tool housing (39) and can slide back and forth to cooperate with the sliding switch (33). The sliding switch (33) is connected to the rotating shaft (28) and rotates along with the rotating shaft (28). By adjusting the position of the shift fork (32), the first small gear (30) or the second small gear (35) of the transmission is selected through the sliding switch (33) to complete the function switching. The cam (13) comprises six push stroke segments and return stroke segments per revolution, and the push stroke and return stroke motion angles are both 30° when matched with the universal ball bearing (10); and the displacement curve in the motion law curve of the cam (13) is selected as a cosine curve, and the acceleration curve is also a cosine curve. Each segment of the acceleration curve is connected end to end to form a complete smooth curve, and there is no rigid impact between the universal ball bearing (10) and the cam (13).

2. The hardware tool according to claim 1, characterized in that: The tail end of the impact motor (17) is provided with an impact motor cooling fan (18) which is axially fixed by a second steel wire retaining ring (19).

3. The hardware tool according to claim 1, characterized in that: The tail end of the rotating motor (24) is provided with a rotating motor cooling fan (23) which is axially positioned on the rotating shaft (28) via a third steel wire retaining ring (22).

4. The hardware tool according to claim 1, characterized in that: The impact motor (17) and the rotary motor (24) are permanent magnet brushless motors.

5. The hardware tool according to claim 1, characterized in that: The hardware tool housing (39) is a structure in which two parts, left and right, are spliced and installed. Each groove portion in the hardware tool housing (39) is used to install and limit corresponding parts.

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