A depth adjustable pneumatic milling tool

Abstract

The application relates to a depth-adjustable pneumatic milling tool, which comprises an air inlet unit, a milling unit and an adjusting unit, the air inlet unit is provided with an air inlet channel; the milling unit comprises a pneumatic blade, a rotating shaft and a milling cutter which are fixedly connected in sequence, the air outlet end of the air inlet channel faces the pneumatic blade, and the airflow blown by the air inlet channel can drive the pneumatic blade to rotate so as to drive the milling cutter to rotate; the adjusting unit comprises a depth adjusting seat, the depth adjusting seat can slide relative to the milling cutter along the axial direction of the milling cutter so as to change the length of the milling cutter extending out of the depth adjusting seat. Compared with the prior art, the depth-adjustable pneumatic milling tool provided by the application can change the length of the milling cutter extending out of the depth adjusting seat by sliding the depth adjusting seat, thereby accurately controlling the milling depth and keeping the milling depth unchanged during the whole milling process, and the milling quality is ensured.

Description

Technical Field

[0001] This invention relates to the field of milling equipment technology, and more particularly to a pneumatic milling tool with adjustable depth. Background Technology

[0002] In aircraft repair, due to space constraints, many structural component milling operations need to be performed in situ, making it impossible to use machine tools. This is especially true for areas involving fuel tanks, where the use of electric milling equipment is prohibited. Such operations must be completed using handheld pneumatic tools.

[0003] Existing handheld pneumatic milling tools use a straight shank air drill to hold a milling cutter or rotary file, and drive it to rotate using compressed air to achieve the milling purpose. For example, CN209520398U discloses a straight shank air drill.

[0004] Using existing straight shank air drills for milling makes it impossible to precisely control the milling depth, which can easily damage the bottom parts of aircraft structural components. In addition, the hand is unstable during milling, which can easily cause the tool to jump and damage the structural components. Summary of the Invention

[0005] In view of this, it is necessary to provide a depth-adjustable pneumatic milling tool to solve the technical problem that the existing straight shank air drill cannot accurately control the milling depth, which can easily cause damage to the bottom parts of aircraft structural components.

[0006] This invention provides a depth-adjustable pneumatic milling tool, comprising: an air intake unit, a milling unit, and an adjustment unit. The air intake unit has an air intake channel; the milling unit includes a pneumatic blade, a rotating shaft, and a milling cutter connected in sequence; the air outlet of the air intake channel faces the pneumatic blade, and the airflow from the air intake channel can drive the pneumatic blade to rotate, thereby driving the milling cutter to rotate; the adjustment unit includes a depth adjustment seat, which can slide relative to the milling cutter along the axial direction of the milling cutter to change the length of the milling cutter extending beyond the depth adjustment seat.

[0007] Furthermore, the intake unit includes an intake housing and an intake volume control component. The intake housing forms an intake channel and a first mounting cavity that connects to the intake channel. A first intake port and a first outlet are formed at both ends of the intake channel. The intake volume control component is built into the first mounting cavity to control the intake volume.

[0008] Furthermore, the intake volume control assembly includes a control body, an adjusting rod, a limiting block, and a first elastic element. The control body is built into the first mounting cavity and fixedly connected to the intake housing. The control body forms a first gas channel and a control channel that are interconnected. The two ends of the first gas channel are respectively connected to the first air inlet and the first air outlet. A control hole connected to the control channel is formed on the intake housing. The first elastic element is built into the control channel and connected to one end of the control body and the adjusting rod. The other end of the adjusting rod extends outside the control hole. The limiting block is fixed on the adjusting rod and located at the intersection of the first gas channel and the control channel. The adjusting rod can drive the limiting block to move within the control channel to adjust the position of the limiting block within the first gas channel.

[0009] Furthermore, the intake volume control component also includes a rotary switch, which is sleeved on the intake housing and rotatably connected to the intake housing. An adjustment groove with gradually increasing depth is formed inside the rotary switch. The adjustment rod abuts against the adjustment groove. Rotating the rotary switch can change the abutment position between the adjustment rod and the adjustment groove, thereby changing the displacement of the adjustment rod in the control channel.

[0010] Furthermore, the milling unit also includes a milling housing and a bearing. The milling housing is fixedly connected to the air intake housing. The milling housing forms a second mounting cavity and a second air inlet, a second air outlet, and a rotating shaft opening that connect to the second mounting cavity. The second air inlet connects to the first air outlet. The pneumatic blade is built into the second mounting cavity and is rotatably connected to the milling housing through a bearing. The rotating shaft passes through the rotating shaft opening and is rotatably connected to the milling housing through another bearing.

[0011] Furthermore, the second air inlet is eccentrically arranged relative to the shaft and faces the aerodynamic blades to blow the aerodynamic blades to rotate.

[0012] Furthermore, the adjustment unit also includes an adjustment inner shell and a locking device. The adjustment inner shell is fixedly connected to the milling outer shell, and the locking device is slidably connected to the adjustment inner shell along the axial direction of the milling cutter. The depth adjustment seat is slidably connected to the adjustment inner shell and one end abuts against the locking device.

[0013] Furthermore, the adjustment unit also includes an elastic element, with its two ends connected to the adjustment inner shell and the depth adjustment seat, respectively.

[0014] Furthermore, the outer surface of the adjusting inner shell has external threads, and the locking device has a threaded hole and is fitted onto the adjusting inner shell. By engaging with the external threads through the threaded hole, the locking device can move relative to the adjusting inner shell along the milling cutter axis.

[0015] Furthermore, the adjusting inner housing has a through hole through which a rotating shaft and / or a milling cutter are arranged.

[0016] Compared with the prior art, the depth-adjustable pneumatic milling tool provided by the present invention changes the length of the milling cutter extending from the depth adjustment seat by sliding the depth adjustment seat, thereby precisely controlling the milling depth and keeping it constant throughout the milling process, thus ensuring the quality of milling.

[0017] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it according to the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Specific embodiments of the present invention are given in detail in the following embodiments and their accompanying drawings. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0019] Figure 1 A schematic diagram of an embodiment of the depth-adjustable pneumatic milling tool provided by the present invention;

[0020] Figure 2 A top view of the depth-adjustable pneumatic milling tool provided by the present invention;

[0021] Figure 3 for Figure 2 Sectional view of section AA;

[0022] Figure 4 for Figure 2 Sectional view of section BB;

[0023] Figure 5 for Figure 4 A magnified view of a portion of the image;

[0024] Figure 6 for Figure 1 A schematic diagram of the mechanism of the rotary switch. Detailed Implementation

[0025] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0026] Please see Figures 1 to 4 This invention provides a depth-adjustable pneumatic milling tool. This depth-adjustable pneumatic milling tool can be applied in aircraft repair processes to perform pneumatic milling on-site on non-removable parts, and the milling depth can be controlled with high precision by the operator.

[0027] This depth-adjustable pneumatic milling tool includes an air intake unit 1, a milling unit 2, and an adjustment unit 3. The air intake unit 1 has an air intake channel, and an external air supply device is connected to the air intake end of the air intake channel. The milling unit 2 includes a pneumatic blade 21, a rotating shaft 22, and a milling cutter 23, which are fixedly connected in sequence. The air outlet end of the air intake channel faces the pneumatic blade 21. The airflow blown by the external air supply device through the air intake channel can drive the pneumatic blade 21 to rotate, and drive the milling cutter 23 to rotate through the rotating shaft 22. The adjustment unit 3 includes a depth adjustment seat 31, which can slide relative to the milling cutter 23 along the axial direction of the milling cutter 23 to change the length of the milling cutter 23 extending out of the depth adjustment seat 31.

[0028] During milling operations, the length of the milling cutter 23 extending out of the depth adjustment seat 31 is the milling depth. When the milling depth is set and processing is carried out, the depth adjustment seat 31 is pressed against the periphery of the milling part, and then the pneumatic milling tool is moved to perform milling. This ensures that the milling depth remains constant during milling, thus guaranteeing the quality of milling.

[0029] In some embodiments, the air intake unit 1 includes an air intake housing 11 and an air intake volume control component 12. The air intake housing 11 forms an air intake channel and a first mounting cavity communicating with the air intake channel. A first air inlet 111 and a first air outlet 112 are formed at both ends of the air intake channel. The first air inlet 111 can use a standard interface for easy connection to an external air supply device. The air intake volume control component 12 is built into the first mounting cavity to control the air intake volume, thereby controlling the rotational speed of the milling cutter 23.

[0030] To facilitate the installation of the intake volume control component 12, the intake housing 11 preferably adopts a multi-part splicing structure, with each part forming a first mounting cavity.

[0031] In some embodiments, the air intake control assembly 12 includes a control body 121, an adjusting rod 122, a limiting block 123, and a first elastic member 124. The control body 121 is built into a first mounting cavity and fixedly connected to the air intake housing 11. The control body 121 forms a first gas channel 1211 and a control channel 1212 that are interconnected. The two ends of the first gas channel 1211 are respectively connected to a first air inlet and a first air outlet, and the airflow from the external air supply device is blown towards the milling unit 2 through the first gas channel 1211. A control hole communicating with the control channel 1212 is formed on the air intake housing 11. The first elastic member 124 is built into the control channel 1212 and connects the control body 121 and one end of the adjusting rod 122. The other end of the adjusting rod 122 extends outside the control hole, and the limiting block 123 is fixed on the adjusting rod 122 and located at the intersection of the first gas channel 1211 and the control channel 1212. The adjusting rod 122 can move the limiting block 123 within the control channel 1212 to adjust the extent of the limiting block 123 within the first gas channel 1211. The more of the limiting block 123 is within the first gas channel 1211, the greater its encroachment on the first gas channel 1211, the stronger its obstruction effect on airflow, and the smaller the gas flow rate. Conversely, the smaller the limiting block 123 is within the first gas channel 1211, the greater the gas flow rate.

[0032] Please see Figure 5 and Figure 6 In some embodiments, the intake volume control assembly 12 further includes a rotary switch 125. It is readily understood that the rotary switch 125 controls the airflow by controlling the movement of the adjusting rod 122 within the control channel 1212. The rotary switch 125 is sleeved on and rotatably connected to the intake housing 11. An adjusting groove 1251 with gradually increasing depth is formed inside the rotary switch 125. The adjusting rod 122 abuts against the adjusting groove 1251. Rotating the rotary switch 125 changes the abutment position of the adjusting rod 122 against the adjusting groove 1251, thereby changing the displacement of the adjusting rod 122 within the control channel 1212.

[0033] In a preferred embodiment, a plug may also be provided on the adjusting rod 122. The plug is located in the control channel 1212 near the control hole. The plug is sealed and slidably connected to the control channel 1212 or with a clearance fit, but the clearance is extremely small, so as to avoid or minimize the air leakage of the control channel 1212.

[0034] In some embodiments, the milling unit 2 further includes a milling housing 24 and a bearing 25. The milling housing 24 is fixedly connected to the air intake housing 11. The milling housing 24 forms a second mounting cavity and a second air inlet 241, a second air outlet 242, and a shaft opening that communicate with the second mounting cavity. The second air inlet 241 communicates with the first air outlet 112. The pneumatic blade 21 is built into the second mounting cavity and is rotatably connected to the milling housing 24 via a bearing 25. The shaft 22 passes through the shaft opening and is rotatably connected to the milling housing 24 via another bearing 25.

[0035] In a preferred embodiment, the second air inlet 241 is eccentrically arranged relative to the rotating shaft 22 and faces the aerodynamic blade 21 to blow the aerodynamic blade 21 to rotate.

[0036] In some embodiments, the adjustment unit 3 further includes an adjustment inner shell 32 and a locking device 33. The adjustment inner shell 32 is fixedly connected to the milling outer shell 24, and the locking device 33 is slidably connected to the adjustment inner shell 32 along the axial direction of the milling cutter 23. The depth adjustment seat 31 is slidably connected to the adjustment inner shell 32 and one end abuts against the locking device 33. By sliding the locking device 33 to a specific position on the adjustment inner shell 32 and locking it, one end of the depth adjustment seat 31 abuts against the locking device 33, and the other end abuts against the structure around the milling part during use, the length of the milling cutter 23 extending out of the depth adjustment seat 31 can be fixed, thereby controlling the milling depth.

[0037] The adjusting inner housing 32 may have a through hole through which the rotating shaft 22 and / or the milling cutter 23 are arranged.

[0038] In a preferred embodiment, the adjustment unit 3 further includes an elastic element 34, with its two ends connected to the adjustment inner shell 32 and the depth adjustment seat 31, respectively. This prevents the depth adjustment seat 31 from slipping off the adjustment inner shell 32 and allows it to extend when not in use, protecting the milling cutter 23. The elastic element 34 can be a spring, fitted onto the milling cutter 23.

[0039] In some embodiments, the outer surface of the adjusting inner shell 32 has an external thread, and the locking device 33 has a threaded hole and is sleeved on the adjusting inner shell 32. By engaging with the external thread through the threaded hole, the locking device 33 can move relative to the adjusting inner shell 32 along the axial direction of the milling cutter 23, and remain stationary under the pushing force of the depth adjustment seat 31.

[0040] Compared with the prior art, the depth-adjustable pneumatic milling tool provided by the present invention changes the length of the milling cutter extending from the depth adjustment seat by sliding the depth adjustment seat, thereby precisely controlling the milling depth and keeping it constant throughout the milling process, thus ensuring the quality of milling.

[0041] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A depth adjustable pneumatic milling tool, characterized in that, It includes: air inlet unit, milling unit and adjusting unit, the air inlet unit has air inlet channel; The milling unit includes pneumatic blade, rotating shaft and milling cutter which are fixedly connected in sequence, the air outlet end of the air inlet channel is toward the pneumatic blade, the airflow blown by the air inlet channel can blow the pneumatic blade to rotate, to drive the milling cutter to rotate; The adjusting unit includes depth adjusting seat, the depth adjusting seat can slide along the axial direction of the milling cutter relative to the milling cutter, to change the length of the milling cutter extending out of the depth adjusting seat; The air inlet unit includes air inlet shell and air inlet amount control assembly, the air inlet shell forms the air inlet channel and the first installation cavity communicated with the air inlet channel, and the air inlet channel forms first air inlet and first air outlet at both ends; The air inlet amount control assembly is built-in in the first installation cavity to control the air inlet amount; The air inlet amount control assembly includes control body, adjusting rod, limiting block and first elastic member, the control body is built-in in the first installation cavity and is fixedly connected with the air inlet shell, the control body forms first gas channel and control channel which are communicated with each other, the both ends of the first gas channel are communicated with the first air inlet and first air outlet respectively, the air inlet shell is formed with control hole communicated with the control channel, the first elastic member is built-in in the control channel and is connected with the control body and one end of the adjusting rod, the other end of the adjusting rod extends to the outside of the control hole, the limiting block is fixedly arranged on the adjusting rod and located at the intersection of the first gas channel and the control channel; The limiting block can be moved in the control channel by the adjusting rod, to adjust the amplitude of the limiting block in the first gas channel; The air inlet amount control assembly further includes rotary switch, the rotary switch is sleeved on the air inlet shell and is rotatably connected with the air inlet shell, the inside of the rotary switch is formed with adjusting groove with gradually increasing depth, the adjusting rod is abutted with the adjusting groove, and the abutted position of the adjusting rod and the adjusting groove can be changed by rotating the rotary switch, so as to change the displacement of the adjusting rod in the control channel; The milling unit further includes milling shell and bearing, the milling shell is fixedly connected with the air inlet shell, the milling shell forms second installation cavity and second air inlet, second air outlet and rotating shaft port communicated with the second installation cavity, the second air inlet is communicated with the first air outlet, the pneumatic blade is built-in in the second installation cavity and is rotatably connected with the milling shell through one bearing, and the rotating shaft penetrates through the rotating shaft port and is rotatably connected with the milling shell through another bearing.

2. A depth adjustable pneumatic milling tool according to claim 1, characterized in that, The second air inlet is eccentrically arranged relative to the rotating shaft and is toward the pneumatic blade, to blow the pneumatic blade to rotate.

3. The depth adjustable pneumatic milling tool of claim 1, wherein, The adjusting unit further includes adjusting inner shell and locker, the adjusting inner shell is fixedly connected with the milling shell, the locker is fixedly and slidably connected with the adjusting inner shell along the axial direction of the milling cutter, and the depth adjusting seat is slidably connected with the adjusting inner shell and is abutted with one end of the locker.

4. A depth adjustable pneumatic milling tool according to claim 3, characterized in that, The adjusting unit further comprises elastic members, two ends of each of the elastic members being connected to the adjusting inner shell and the depth adjusting seat respectively.

5. The depth adjustable pneumatic milling tool of claim 3, wherein, The outer surface of the adjusting inner shell is provided with external threads, the lock has a threaded hole and is sleeved on the adjusting inner shell, the lock being capable of moving axially along the milling cutter relative to the adjusting inner shell by rotating and engaging the threaded hole with the external threads.

6. The depth adjustable pneumatic milling tool of claim 3, wherein, The adjusting inner shell has a through hole, the rotating shaft and / or the milling cutter being arranged through the through hole.

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