CN112975681A

CN112975681A - Negative pressure drive equipment suitable for small-size instrument

Info

Publication number: CN112975681A
Application number: CN202110334631.7A
Authority: CN
Inventors: 袁智强; 陈志�; 冯就勉
Original assignee: PSC; Pumi Medical Co ltd
Current assignee: PSC; Pumi Medical Co ltd
Priority date: 2021-03-29
Filing date: 2021-03-29
Publication date: 2021-06-18
Anticipated expiration: 2041-03-29
Also published as: CN112975681B

Abstract

The present invention provides a negative pressure driving apparatus suitable for a small tool, comprising: the handle is provided with an air inlet and an air outlet, the air inlet is arranged at the front end of the handle, and the air outlet is arranged at the rear end of the handle; the air inlet and the air outlet are connected to form an air flow channel, and the air outlet is connected with the negative pressure driving source; a driving shaft rotatably supported at the air inlet; the fan blade rotating assembly is fixed on the driving shaft; the tool head is connected with the front end of the driving shaft, exposed out of the handle and at least used for grinding, drilling or cutting; the negative pressure driving source forms negative pressure in the air flow channel, so that external air enters the air flow channel from the air inlet, the fan blade rotating assembly is driven to rotate, and the driving shaft and the tool head are driven to rotate. The universal negative pressure driving source is utilized to provide high-speed airflow to drive the equipment to rotate at high speed and efficiently suck the abrasive dust, dust or smoke generated by the work, so that the self weight of the driving equipment is reduced and the cost is reduced.

Description

Negative pressure drive equipment suitable for small-size instrument

Technical Field

The invention relates to the field of grinding instruments, in particular to a negative pressure driving device suitable for small tools.

Background

Currently, the grinding apparatus in the market is generally driven by electricity, and needs additional equipment to treat grinding dust, dust or smoke, for example, high-pressure water washing equipment, a smoke suction machine or a dust suction machine, and the like. These additional abrasive dust and dust treatment equipment systems are complex in composition, making the polishing process cumbersome. Even the integration of a smoking or suction assembly directly on the abrading device results in a heavy weight for some abrading devices, is tiring for the operator over time, and is prone to error. Meanwhile, the additional abrasive dust equipment system is not efficient in processing abrasive dust, dirt or smoke. Moreover, the above mentioned sanding devices are also expensive and costly to use.

Meanwhile, the existing grinding devices are generally divided into two types, one of which is that a motor is arranged in the device and provides rotation power for the grinding device to realize the grinding function of the grinding device, but if a higher rotation speed is realized, a motor with higher power is needed, the volume and the weight of the motor need to be increased, so that the weight of the device is increased, and the long-time grinding of an operator is not facilitated; the second is that the instrument of polishing self is not provided with the motor, but passes through the motor of flexible axle connection extra preparation, and the motor passes through the flexible axle and provides rotation power for the instrument of polishing, but the flexible axle to a great extent has restricted the turned angle of the instrument of polishing, is unfavorable for carrying out accurate polishing operation.

Therefore, a grinding apparatus which has a low cost and a light weight and can efficiently treat the grinding dust, dirt or smoke generated during grinding is in urgent need of development.

Disclosure of Invention

The invention aims to overcome at least one defect of the prior art, and provides a negative pressure driving device suitable for a small tool, which is used for solving the problems that the existing abrasive dust treatment device is complex in system composition and high in cost, and a grinding instrument becomes heavy after being integrated with other components.

The technical scheme adopted by the invention comprises the following steps:

a negative pressure driving apparatus suitable for a small tool, comprising: the handle is provided with an air inlet and an air outlet, the air inlet is arranged at the front end of the handle, the air outlet is arranged at the rear end of the handle, the air inlet and the air outlet are connected to form an air flow channel, and the air outlet is connected with a negative pressure driving source; a drive shaft rotatably supported to the air inlet; a fan blade rotating assembly fixed to the driving shaft; the tool head is connected with the front end of the driving shaft, exposed out of the handle and at least used for grinding, drilling or cutting; the negative pressure driving source forms negative pressure in the air flow channel, so that external air enters the air flow channel from the air inlet, the fan blade rotating assembly is driven to rotate, and the driving shaft and the tool head are driven to rotate by the rotation of the fan blade rotating assembly.

The negative pressure driving source connected with the air outlet forms negative pressure in the air flow channel, so that when external air flow enters the handle from the air inlet, the fan blade rotating assembly is driven to rotate, the driving shaft and the tool head connected with the driving shaft are driven to rotate, the driving device is driven to rotate by the tool head, functions of polishing, cutting or drilling and the like can be achieved, and meanwhile, the negative pressure driving source provides high-speed air flow to drive the tool head connected with the device in a high-speed rotating mode to effectively suck generated abrasive dust, dust or smoke and the like during polishing, cutting or drilling. That is to say, when the negative pressure driving source is applied to the driving device, the suction effect can be generated, the formed negative pressure is also the power for driving the tool head to rotate, so that the driving device can efficiently suck abrasive dust, dust or smoke while driving the tool head to rotate, the kinetic energy of the gas is converted into mechanical energy, and the rotating speed of the tool head is greatly improved. The driving device provided by the invention does not need other additional washing and smoking devices to work in a matching way except for the negative pressure driving source, has simple structure, light weight, low cost and simple operation, and can realize the function of efficiently sucking abrasive dust, dust or smoke while grinding, cutting or drilling. The tool head is at least used for grinding, drilling or cutting, so that the driving device can be applied to various practical scenes. The negative pressure driving source can be a general driving source, so that the use cost of the driving equipment is reduced.

Further, the fan blade rotating assembly is a rotatable fan blade group with more than two stages; the air inlet is provided with a fixed fan blade; the two or more stages of rotatable fan blade sets are arranged in the middle or the rear end of the driving shaft.

The fixed flabellum of locating the air inlet combines the flabellum of the high-speed rotation of the rotatable fan blade group more than the two-stage to be used for changing the flow direction of air current of air inlet work area, make one section distance around the fixed flabellum include that the air current of tool head work area is mainly the whirl, be turbulent state, form the tornado effect, improve the flow velocity of air current and the suction effect of reinforcing air current, the rotatable fan blade group more than the two-stage can provide stronger rotation power, thereby drive shaft and tool head high-speed rotation, make its polish, effect when cutting or boring is better.

Further, the driving shaft is respectively connected with bearings at the front end and the rear end of the driving shaft so as to realize that the driving shaft is rotatably supported on the air inlet; and bearings connected with the front end and the rear end of the driving shaft are respectively arranged at two sides of the fan blade rotating assembly.

Thereby the drive shaft is connected with the bearing at its front end and rear end and is rotated support in the air inlet, can provide more stable rotational power for its instrument head of connecting, even under high-speed rotation, instrument head and drive shaft also can not shift, can realize polishing, cutting and the function of boring steadily.

Further, a speed regulating part is arranged at the rear end of the handle and used for controlling the flow of external air entering the air flow channel. The speed regulating part is arranged at the rear end of the handle, an operator is not easy to shield or cover the speed regulating part when operating the handle, and the speed regulating part is used for controlling the flow of the external air entering the air flow channel and reducing or improving the flow of the external air flowing into the air flow channel when necessary.

Further, the speed regulating component comprises a first sub speed regulating component and a second sub speed regulating component, and the first sub speed regulating component is rotatably embedded in the second sub speed regulating component; a plurality of first air inlets are arranged at the embedded position of the first sub speed regulating part; a plurality of second air inlets are arranged at the embedding position of the second sub speed regulating part; the plurality of first air inlet holes and the plurality of second air inlet holes are matched to control the flow of external air entering the air flow channel.

Under the condition that the suction flow of the negative pressure driving source is fixed, when the plurality of first air inlet holes and the plurality of second air inlet holes are completely overlapped, the overlapped air inlet area of the two air inlet holes reaches the maximum, external air can enter an air flow channel in the handle from the air inlet and the overlapped positions of the first air inlet holes and the second air inlet holes, the air entering the air flow channel from the overlapped positions of the first air inlet holes and the second air inlet holes does not act on the rotatable fan blade groups with more than two stages, and the rotating speed of the rotatable fan blade groups with more than two stages is the lowest; in a similar way, when the plurality of first air inlet holes and the plurality of second air inlet holes are completely staggered and mutually sealed, the air inlet areas of the two air inlet holes reach the minimum, the external air entering the air flow channel can completely act on the fan blade group, and the rotating speed of the fan blades is highest. An operator can rotate the first sub speed regulating component or the second sub speed regulating component to enable the first air inlet hole and the second air inlet hole to be overlapped/staggered in different degrees according to actual application scenes, so that the flow of external air entering the air flow channel is adjusted, and the working rotating speed of the equipment is changed. The quantity and the size of first inlet port and second inlet port are not restricted, can be decided according to actual demand, for example when the size of second inlet port is less, can set up the second inlet port that the quantity is more and cooperate with first inlet port and carry out the speed governing.

Further, the number of the blades of each stage of fan blades of the two or more stages of rotatable fan blade groups ranges from 3 to 30; the hub ratio of each stage of fan blade ranges from 0.2 to 0.6; the range of the installation angle of each stage of fan blades is 70-80 degrees; the number of the blades of the fixed fan blade ranges from 3 to 30, and the hub ratio of the fixed fan blade ranges from 0.3 to 0.8; the range of the installation angle of the fixed fan blades is 70-80 degrees.

Further, the apparatus further comprises: and the flow guide piece is arranged on the air inlet and exposed out of the handle.

The flow guide piece exposed out of the handle is arranged on the air inlet and used for guiding air in the vicinity of the flow guide piece to the air flow channel in the handle and simultaneously guiding abrasive dust, dust and smoke generated by the tool head during working to enter the air flow channel, so that the suction efficiency and effect of the abrasive dust, the dust and the smoke are improved while the abrasive dust, the dust and the smoke are blocked.

Further, the guide part is in a horn shape which diverges outwards. The trumpet-shaped flow guide piece is more favorable for guiding external air to enter the air flow channel and simultaneously is favorable for guiding abrasive dust, dust and smoke to enter the air inlet.

Further, the flow guide piece is of a sheet structure or an annular structure. The guide piece of the sheet structure or the annular structure can play a certain shielding role, and prevents abrasive dust, dust and smoke from splashing everywhere, so that an operator is influenced to polish, cut or drill.

Furthermore, the material of water conservancy diversion spare is transparent or has the observation breach, therefore the water conservancy diversion spare can not produce any sight to operator's operation process and hinder.

Compared with the prior art, the invention has the beneficial effects that: the weight of the handheld part of the driving device provided by the invention is greatly reduced, so that an operator is not easy to fatigue and is easy to perform fine operation when in use. The universal negative pressure driving source can efficiently suck generated abrasive dust, dust or smoke when providing the rotation power for grinding, cutting or drilling. Meanwhile, the driving equipment only needs a universal negative pressure driving source, and other additional integrated components or equipment are not needed for matching, so that the running cost of the whole equipment is greatly reduced.

Drawings

Fig. 1 is a schematic structural composition diagram of a driving apparatus of the embodiment.

Fig. 2 is a perspective view of the driving apparatus of the embodiment.

Fig. 3 is a schematic view of a change in the airflow state of the drive apparatus of the embodiment.

Fig. 4 is a schematic structural view illustrating the guide member of the driving apparatus of the embodiment attached to the handle.

Description of reference numerals:

a handle 100; an operation part A; an operation portion a 1; an operation portion a 2; an operation portion a 3; a hand-held part B; a hand-held portion B1; a hand-held portion B2; the first air intake holes B1-1; the second air intake holes B2-1; an air inlet 110; an air outlet 120; a drive shaft 200; a fan blade rotating assembly (two or more stages of rotatable fan blade sets) 310; a stationary fan blade 320; a tool head 400; a first bearing 510; a second bearing 520; a nut 600; a coupling 700; a silicone bellows 800; a flow guide 900.

Detailed Description

The drawings are only for purposes of illustration and are not to be construed as limiting the invention. For a better understanding of the following embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

As shown in fig. 1, the present embodiment provides a negative pressure driving apparatus suitable for a small tool, including: handle 100, drive shaft 200, fan blade rotation assembly 310, and tool head 400.

The handle is provided with an air inlet 110 and an air outlet 120, the air inlet 110 is arranged at the front end of the handle 100, and the air outlet 120 is arranged at the rear end of the handle 100. The air inlet 110 is connected with the air outlet 120, an air flow channel is formed inside the handle 100, the air outlet 120 is connected with the negative pressure driving source, preferably, before the air outlet 120 is directly connected with the negative pressure driving source, the air outlet 120 is connected with the silicone bellows 800 first, and is connected with the negative pressure driving source through the silicone bellows 800, and the silicone bellows 800 may be any suitable pipeline. Specifically, the negative pressure driving source may be a general driving source, such as a dust collector, a smoking machine, or the like.

Specifically, as shown in fig. 1 and 2, the front half of the handle 100 is a handle a, which is mainly a handle for grinding, cutting or drilling, and can be separated into three parts, namely a handle a1, a handle a2 and a handle A3, which are engaged with each other. The rear half of the handle 100 is a hand-held part B, and can be split into two mutually-embedded parts, namely a hand-held part B1 and a hand-held part B2, the rear half of the handle 100 is mainly a part that is operated by an operator in a hand-held manner, namely the hand-held part B1 and the hand-held part B2, and as shown in fig. 2, the front half and the rear half of the handle 100 are connected by embedding the operation part A3 and the hand-held part B1. Referring to fig. 1 and 2, the driving shaft 200 is rotatably supported on the air inlet 110, and the fan blade rotating assembly 310 is fixed to the driving shaft 200. The tool head 400 is coupled to the front end of the driving shaft 200 and exposed to the handle 100, and the tool head 400 is used at least for grinding, drilling or cutting. When the fan blade rotating assembly 310 rotates, the driving shaft 200 is driven to rotate, and the tool head 400 connected to the driving shaft 200 is driven to rotate.

Specifically, the drive shaft 200 is rotatably supported by the intake port 110 through the cooperation of a first bearing 510, a second bearing 520, and a nut 600, the first bearing 510 being provided at the front end of the drive shaft 200, the second bearing 520 being provided at the rear end of the drive shaft 200, and the nut 600 being fitted into the second bearing 520 to connect the operation portions a2 and A3. The driving shaft 200 is rotatably supported to the air inlet 110 by being coupled to the first and

second bearings

510 and 520 at the front and rear ends thereof, so that it is possible to provide more stable rotational power to the tool bit 400 coupled thereto, the tool bit 400 and the driving shaft 200 are not displaced even at high-speed rotation, and it is possible to stably perform functions of grinding, cutting and drilling.

Specifically, as shown in fig. 1 and 2, the fan blade rotating assembly 310 is a two-stage or more rotatable fan blade set 310, and the two-stage or more rotatable fan blade set 310 is disposed at the middle or rear end of the driving shaft 200. Specifically, the first bearing 510 is disposed at the front end of the driving shaft, and preferably, the first bearing 510 may be fittingly fixed to the fixed fan blade 320. The second bearing 520 is disposed at the rear end of the driving shaft 200, and the two or more stages of the rotating fan blade sets 310 are advantageous for increasing the rotation speed of the driving shaft 200, i.e., also the rotation speed of the tool bit 400.

Preferably, the number of blades of each stage of the fan blades of the two or more rotatable fan blade groups 310 ranges from 3 to 30; the hub ratio of each stage of fan blades ranges from 0.2 to 0.6; the range of the installation angle of each stage of fan blades is 70-80 degrees.

Preferably, the number of the blades of the fixed fan blade 320 ranges from 3 to 30, and the hub ratio of the fixed fan blade 320 ranges from 0.3 to 0.8; the range of the installation angle of the fixed fan blade 320 is 70-80 degrees.

Table 1 shows the rotational speed data of the driving devices of the experimental sample numbers C2001V1 and C2001V 4.

The parameters of the two or more stages of the rotatable fan blade set 310 and the fixed fan blade 320 of the driving device with the experimental sample number C2001V1 are not in the above preferred ranges, and the rotation speed of the fan blade set of the driving device with the experimental sample number C2001V1 is about 10000 RPM.

The parameters of the two or more stages of the rotatable blade group 310 and the fixed blade 320 of the driving device of the experimental sample number C2001V4 are both within the above preferred ranges, and the rotation speed of the blade of the driving device of C2001V4 and the tool head 400 is about 80000 RPM.

It can be seen that the parameters of the two or more stages of rotatable fan blade sets 310 and the fixed fan blades 320 can effectively increase the rotation speed of the two or more stages of rotatable fan blade sets 310 if they are within the preferred value ranges provided above.

TABLE 1

Sample numbering	Rotational speed (RPM)
		C2001V1	About 10000RPM
C2001V4	About 80000RPM

Alternatively, the tool head 400 and the drive shaft 200 may be coupled by the coupling 700, and alternatively, the tool head 400 may be directly nested or directly mounted to the drive shaft 200 without the coupling 700. Under this alternative, the tool head 400 can be replaced in different application scenarios, and the tool head 400 can also be a disposable product, which improves the stability of the driving device and reduces the cost of the driving device since the coupling 700 is not needed. The tool head 400 is at least used for grinding, drilling or cutting, meaning that the tool head 400 may be at least a grater, a drill or a head having a cutting function.

The operation process of the driving device is as follows: after the negative pressure driving source is started, negative pressure is formed in the air flow passage of the handle through the air outlet 120, so that external air enters the air flow passage from the air inlet 110, the external air firstly passes through the fixed fan blade 320, the flow direction of the air flow in the peripheral area of the air inlet 110 can be changed by the fixed fan blade 320, the air flow in the front and back of the fixed fan blade 320 including the working area of the tool head 400 is mainly rotary flow and in a turbulent flow state, and a tornado effect is formed, as shown in fig. 3, the air flow in the front and back of the fan blade 320 including the working area of the tool head 400 is in a turbulent flow state, the tornado effect is formed in the working area of the tool head 400, the efficiency of sucking abrasive dust, dust or smoke is improved, the air flow drives the rotatable fan blade group 310 with more than two stages to rotate at high speed, so as to drive the driving shaft 200, Cutting or drilling, etc. Meanwhile, the negative pressure generated by the negative pressure driving source can effectively suck generated abrasive dust, smoke, or the like when the tool bit 400 performs grinding, cutting, or drilling. That is, the negative pressure generated when the negative pressure driving source is applied to the driving apparatus can generate a suction effect and convert the kinetic energy of the gas into mechanical energy, i.e., the mechanical energy is used to drive the tool bit 400 to rotate, so that the rotation speed of the tool bit 400 is greatly increased, and the tool bit can efficiently suck the abrasive dust, the dust or the smoke while rotating. The driving device provided by the invention does not need other extra flushing and smoking devices to cooperate (namely, other devices are not needed to be additionally used for sucking abrasive dust and the like during grinding), has simple structure, light weight, low cost and simple operation, can realize the function of efficiently sucking abrasive dust, dust or smoke during grinding, cutting or drilling, and avoids the problems of EMI (Electromagnetic Interference) or EMC (Electro Magnetic Compatibility) compared with an active product of an electric type due to the fact that the driving device is a passive product.

Preferably, the driving apparatus further includes a guide member 900 disposed at the air inlet 110 of the handle 100 and exposed from the handle 100.

The guiding member 900 exposed out of the handle 100 is disposed at the air inlet 110, and is used for guiding air in the vicinity of the guiding member 900 to the air flow passage in the handle 100, and simultaneously guiding the abrasive dust, the dust and the smoke generated during the operation of the tool head 400 to enter the air flow passage, so as to block the abrasive dust, the dust and the smoke and improve the suction efficiency and the suction effect of the abrasive dust, the dust and the smoke.

Preferably, as shown in connection with fig. 1 and 2, the baffle 900 is flared outwardly. The trumpet-shaped flow guide 900 is more advantageous in guiding external air into the air flow passage and also in guiding abrasion dust, dust and smoke into the air flow passage.

Preferably, as shown in fig. 4, the flow guiding member 900 has a sheet-like structure or a ring-like structure, and the flow guiding member 900 is provided with a ring-shaped interface connected with the air inlet 110, as shown in fig. 4(a), the flow guiding member 900 has a sheet-like structure; as shown in fig. 4(b), the flow guiding member is of an annular structure, and the flow guiding members 900 of both structures can play a certain shielding role when the tool head 400 works, so as to prevent the abrasive dust, the dust and the smoke from directly contacting an operator or splashing around, and play a role in guiding the outside air and the abrasive dust, the dust or the smoke to enter the air flow passage. In practical application, an operator can replace the diversion element 900 with different structures and lengths according to actual needs, so that the driving device is suitable for more scenes. The length of the flow guide 900 shown in fig. 4 is smaller than that of the tool head 400 only for illustration, and the length of the flow guide 900 should be determined according to the actual application.

Preferably, the baffle 900 is made of a transparent material or has a viewing gap, so that the baffle 900 does not obstruct any view during operation by an operator.

Preferably, as shown in fig. 1 and 2, the hand-held portion B1 and the hand-held portion B2 are rotatably engaged with each other, the hand-held portion B1 and the hand-held portion B2 are engaged to adjust the flow rate of the external air entering the air inlet 110, the hand-held portion B1 is a first sub speed regulation member of the hand-held portion B, and the hand-held portion B2 is a second sub speed regulation member of the hand-held portion B.

The specific principle and process of speed regulation of the hand-held part B1 and the hand-held part B2 are as follows:

a plurality of first air inlet holes B1-1 are formed in the embedded position of the handheld portion B1, a plurality of second air inlet holes B2-1 are formed in the embedded position of the handheld portion B2, and when the handheld portion B1 and the handheld portion B2 are embedded, the plurality of first air inlet holes B1-1 and the plurality of second air inlet holes B2-1 can be staggered or overlapped by rotating the handheld portion B1 or the handheld portion B2, so that the rotating speed of the rotatable fan blade group 310 with more than two stages can be controlled.

As shown in FIG. 2, as an example, two second air intake holes B2-1 are provided at the hand-held portion B2, and one first air intake hole B1-1 is provided at the hand-held portion B1. When the first air inlet hole B1-1 and one of the second air inlet holes B2-1 are completely overlapped, the overlapped air inlet area of the two air inlet holes reaches the maximum, and there are two positions where the external air can enter the air flow passage in the handle 100, namely the overlapped position of the first air inlet hole B1-1 and the second air inlet hole B2-1, and secondly, the air inlet 110, under the condition that the suction flow rate of the negative pressure driving source is constant, because the air cannot enter only from the air inlet 110, the flow rate of the external air entering from the air inlet 110 flowing in the air flow passage is reduced, the aerodynamic energy acting on the rotatable fan blade group 310 at more than two stages is partially reduced, and the rotating speed of the rotatable fan blade group 310 at more than two stages is reduced; similarly, when the first air intake hole B1-1 and all the second air intake holes B2-1 are completely staggered, only the air inlet 110 is left at the position where the whole handle can enter air, the flow rate of the outside air entering the air inlet 110 is the highest, and the air kinetic energy of the outside air can completely act on the fan blades, so that the rotating speed of the rotatable fan blade group 310 with more than two stages is increased. An operator can rotate the hand-held part B1 or the hand-held part B2 to enable the first air inlet hole B1-1 and the second air inlet hole B2-1 to be overlapped/staggered to different degrees according to actual operation requirements, so that the working rotating speed of the device can be changed by adjusting the kinetic energy of air acting on the fan blade group. The number and size of the first air intake vent B1-1 and the second air intake vent B2-1 are not limited, and can be determined according to actual requirements, for example, when the size of the second air intake vent B2-1 is smaller, the second air intake vent B2-1 with a larger number can be arranged to cooperate with the first air intake vent B1-1 for speed regulation.

As shown in table 2, the rotation speed data of the driving device of the experimental sample C2001V4 in the speed adjusting process is shown, and the speed adjusting process is described with reference to the rotation speed data of table 2:

when the first air inlet hole B1-1 and the second air inlet hole B2-1 are completely staggered, so that the two air inlet holes are in a closed state (namely the air inlet areas of the first air inlet hole B1-1 and the second air inlet hole B2-1 are 0), the rotating speed of the rotatable fan blade group 310 with more than two stages reaches the maximum, and is about 80000 RPM;

when the first air inlet hole B1-1 and the second air inlet hole B2-1 are partially overlapped, namely the air inlet areas of the first air inlet hole B1-1 and the second air inlet hole B2-1 account for 50% of the total area of the air inlet holes, the two or more stages of rotatable fan blade sets 310 can realize the rotating speed of about 70000 RPM;

when the first intake vent B1-1 and the second intake vent B2-1 are completely overlapped, that is, the intake areas of all the first intake vent B1-1 and the second intake vent B2-1 reach the maximum, the rotating speed of the two or more stages of the rotatable fan blade sets 310 reaches the minimum, about 20000 RPM.

TABLE 2

As shown in FIG. 2, the handheld portion B1 is longer, the handheld portion B2 is shorter, and the position where the handheld portion B1 and the handheld portion B2 are rotatably engaged is provided at the rear end of the handheld portion B, so that the operator is not easy to block or cover the first air inlet hole B1-1 or the second air inlet hole B2-1 when operating the handle through the handheld portion B.

In the above description, it is mentioned that the tool head 400 may be a disposable product and can be replaced according to different application scenarios, and the following description exemplifies different application scenarios of the driving apparatus.

(1) The driving device is applied to an industrial scene, the tool head 400 is an industrial grinding head and the like and can be used for grinding, cutting or drilling, and the negative pressure driving source can be an industrial smoking machine or an exhaust fan.

In an industrial application scenario, the diversion member 900 generally needs to be additionally installed at the air inlet 110 of the driving device, which is not only beneficial to absorbing abrasive dust and the like generated during the operation of the tool head 400, but also can effectively prevent the abrasive dust and the like from splashing, and because the grinding, cutting or drilling in the industrial scenario generally generates higher temperature, and the generated abrasive dust and the like are substances which are not suitable for contacting with the skin of a human body, the addition of the diversion member 900 can avoid the accidental injury of an operator. Different types of flow guide members 900 can be selected according to actual scenes, the length and the structure of the different types of flow guide members 900 are different, the length of the flow guide member 900 can be larger than that of the tool head 400, and the flow guide member 900 is of a sheet structure or an annular structure and is suitable for driving equipment to polish the surface of an object or cut the object; if the length of the diversion member 900 is smaller than that of the tool head 400, the diversion member 900 with the design is suitable for driving equipment to extend into an object for grinding, cutting or drilling on the surface of the object, and the diversion member 900 is shorter, so that the normal operation of the tool head 400 extending into the object or drilling is not influenced. For precise operation, the baffle 900 is preferably transparent so as not to obstruct the view of the operator.

If an operator needs to grind or cut a hard component, the first air inlet hole B1-1 and the second air inlet hole B2-1 can be staggered by rotating the hand-held part B1 and the hand-held part B2, so that the flow of air entering the air inlet 110 is increased, the rotation speed of the fan blade rotating assembly 310 is increased, the rotation speed of the driving shaft 200 and the tool head 400 is increased accordingly, and the tool head 400 can provide larger grinding power.

Specifically, in an industrial scenario, the multiple driving devices may share the same negative pressure driving source, that is, the air outlets 120 of the multiple driving devices are all connected to the same negative pressure driving source, a switch may be disposed at the air outlet of each driving device, and the switch of each driving device may control whether the shared negative pressure driving source forms a negative pressure in the air flow channel through the air outlet 120 of the driving device, so that one or more driving devices of the multiple driving devices may be controlled to operate through the switch, and the use cost of the multiple driving devices may also be reduced by sharing the same negative pressure driving source.

(2) The driving device is applied to a household scene, the tool head is a household grinding head and the like and can be used for grinding, cutting or drilling, the negative pressure driving source can be a household dust collector, and a household dust collector is generally not used for generating too much grinding dust splashing or generating harmful substances in the household scene, so that whether the flow guide piece 900 needs to be additionally arranged on the air inlet 110 can be determined according to the requirement of an operator, the length and the material of the flow guide piece 900 are selected, the rotation speed of the handheld parts B1 and B2 is adjusted, and the corresponding description of the industrial scene can be referred to in the process that a plurality of driving devices share the same negative pressure driving source.

(3) The driving apparatus is applied to a nail art scene, and the tool head 400 is a grinding head for nail art, and is generally used for grinding nails. The negative pressure driving source can be a household dust collector or a small exhaust fan. Because the beautiful nail needs meticulous operation, operator and beautiful nail guest all can be relatively close to drive arrangement, therefore under the beautiful nail scene, the air inlet 110 of drive arrangement also preferably installs water conservancy diversion piece 900 additional for shelter from the abrasive dust that produces when polishing the nail, avoid its everywhere to splash. When the operator needs to perform a very fine nail grinding operation, the rotational speed of the tool bit 400 can be adjusted by adjusting the flow rate of air entering the air inlet 110 by rotating the hand-held portions B1 and B2. The length and material of the diversion piece 900 are selected, and the corresponding description of an industrial scene can be referred to in the process that a plurality of driving devices share the same negative pressure driving source, and the process that a plurality of driving devices share the same negative pressure driving source is particularly suitable for a nail art scene, so that a convenient and efficient driving device system can be established in a limited area of a nail art shop, and the operation cost of the nail art shop is reduced.

(4) The drive apparatus is used in a medical setting and the tool head 400 is a medical burr typically used for sanding, cutting or drilling. The negative pressure driving source can be a medical smoking machine and is used for absorbing medical wastes such as abrasive dust, dust or smoke generated in operation and reducing the possibility of cross infection. In a medical scenario, since medical wastes such as abrasion, dust, smoke, and the like generated during an operation are harmful substances, the air inlet 110 of the driving device is preferably additionally provided with the flow guide member 900, and the length and material of the flow guide member 900, the rotation speed of the handheld portions B1 and B2, and the process of sharing the same negative pressure driving source by a plurality of driving devices can refer to the corresponding description of the industrial scenario.

Therefore, the driving device can be applied to a very wide range of scenes under different combinations of the tool head 400 or the guide member 900, and the negative pressure driving source can adopt a driving source which is general under the corresponding scene, so that the use cost of the driving device is low.

It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the technical solutions of the present invention, and are not intended to limit the specific embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention claims should be included in the protection scope of the present invention claims.

Claims

1. A negative pressure drive apparatus adapted for use with a small tool, comprising:

the handle is provided with an air inlet and an air outlet; the air inlet is arranged at the front end of the handle, the air outlet is arranged at the rear end of the handle, the air inlet and the air outlet are connected to form an air flow channel, and the air outlet is connected with the negative pressure driving source;

a drive shaft rotatably supported to the air inlet;

a fan blade rotating assembly fixed to the driving shaft;

the tool head is connected with the front end of the driving shaft, exposed out of the handle and at least used for grinding, drilling or cutting;

the negative pressure driving source forms negative pressure in the air flow channel, so that external air enters the air flow channel from the air inlet, the fan blade rotating assembly is driven to rotate, and the driving shaft and the tool head are driven to rotate by the rotation of the fan blade rotating assembly.

2. The negative pressure drive apparatus as claimed in claim 1, wherein the fan blade rotating assembly is a two-stage or more rotatable fan blade group; the air inlet is provided with a fixed fan blade; the two or more stages of rotatable fan blade sets are arranged in the middle or the rear end of the driving shaft.

3. The negative pressure driving apparatus according to claim 2, wherein the drive shaft is rotatably supported to the air intake port by being connected to bearings at a front end and a rear end thereof, respectively; and bearings connected with the front end and the rear end of the driving shaft are respectively positioned at two sides of the fan blade rotating assembly.

4. The negative pressure driving device according to any one of claims 1 to 3, wherein a speed regulating member is provided at a rear end of the handle, and the speed regulating member is used for controlling a flow rate of outside air entering the air flow passage.

5. The negative pressure driving apparatus according to claim 4, wherein the speed regulating member includes a first sub speed regulating member and a second sub speed regulating member, the first sub speed regulating member being rotatably fitted to the second sub speed regulating member;

a plurality of first air inlets are arranged at the embedded position of the first sub speed regulating part; a plurality of second air inlets are arranged at the embedding position of the second sub speed regulating part; the plurality of first air inlet holes and the plurality of second air inlet holes are matched to control the flow of external air entering the air flow channel.

6. The negative pressure driving apparatus according to any one of claims 2 to 3 or 5,

the number of the blades of each stage of fan blades of the two or more stages of rotatable fan blade groups ranges from 3 to 30; the hub ratio of each stage of fan blade ranges from 0.2 to 0.6; the range of the installation angle of each stage of fan blades is 70-80 degrees;

the number of the blades of the fixed fan blade ranges from 3 to 30, and the hub ratio of the fixed fan blade ranges from 0.3 to 0.8; the range of the installation angle of the fixed fan blades is 70-80 degrees.

7. The negative pressure driving apparatus according to any one of claims 1 to 3 or 5, further comprising: and the flow guide piece is arranged on the air inlet and exposed out of the handle.

8. The vacuum driven apparatus as in claim 7, wherein the deflector is flared outwardly.

9. The negative pressure drive apparatus of claim 8, wherein the flow guide is a sheet structure or an annular structure.

10. The negative pressure driving apparatus as claimed in claim 7, wherein the diversion member is made of transparent material or has a viewing gap.