Drill bit pressure detection mechanism

Abstract

An embodiment of the utility model discloses a drill bit pressure detection mechanism which comprises a shell, a front end cover, a rear end cover and a main shaft, the front end cover and the rear end cover are mounted on two sides of the shell through screws, a pressure sensor is mounted at one end, facing the rear end cover, of the shell, the main shaft penetrates through the rear end cover, the shell and the front end cover, and a rotating gear and a feeding gear are mounted on the main shaft. The rotating gear and the feeding gear are respectively driven by a motor, the rotating gear is located between the feeding gear and the pressure sensor, the rear end of the main shaft is provided with a rear limiting ring, the rear limiting ring is located at the rear end of the rear end cover, the force of the main shaft on the feeding gear can be directly transmitted to the pressure sensor, and the accuracy of pressure detection is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to automatic feeding drilling equipment technical field, concretely relates to a drill bit pressure detection mechanism. BACKGROUND

[0002] The existing automatic feeding drilling equipment is mainly applied in the aviation field, such as the hole making processing to the fuselage skin in the aircraft assembly process, and the material of the skin is often stacked by multiple materials, and needs to penetrate all material layers when making holes, and the stacked materials mainly include magnesium-aluminum alloy, titanium alloy and carbon fiber etc., and the hardness and cutting properties of each material are different, and the corresponding optimal hole making process (drill bit rotation speed, feeding speed, lubrication parameter etc.) is also different, therefore, in order to ensure the accuracy and quality of hole making, the feeding resistance suffered by the drill tip in the hole making process is required to be monitored in real time, so as to judge the material type being cut, further automatically retrieve the preset hole making process parameters corresponding to the material to continue working, and in case of necessity, emergency stop is also required to avoid the danger of locked-rotor.

[0003] The traditional method for monitoring the resistance of the drill bit is to monitor the current change of the motor driving the main shaft feeding, and the principle is that the torque output by the feeding motor is transmitted through the gear and the screw rod, and the rotary motion of the motor is changed into the linear feeding motion of the main shaft and the drill bit, when the speed is kept unchanged, the torque and the current output by the motor are in a proportional relationship, when the pressure suffered by the drill bit becomes larger or smaller, the output torque and the current of the motor also become larger or smaller accordingly, so that the change of the material contacted by the drill bit can be judged by the change of the current, and the corresponding hole making process parameters can be further adjusted.

[0004] The traditional current monitoring method also has its shortcomings, and the current detection is indirect detection, and the relative accuracy is low, because there is a complex mechanical transmission process from the motor end to the drill bit end, and the vibration of the mechanical structure and the loss of the torque can affect the detection result of the current, and when judging the stacked materials with similar hardness or composition, the current monitoring method can not accurately identify. UTILITY MODEL CONTENTS

[0005] The utility model provides a drill bit pressure detection mechanism, and the pressure value precision of measurement is higher.

[0006] In order to realize the above object, the utility model provides the following technical scheme:

[0007] The drill bit pressure detection mechanism comprises a shell, a front end cover, a rear end cover and a main shaft, the front end cover and the rear end cover are installed on both sides of the shell through screws, a pressure sensor is installed at one end of the shell facing the rear end cover, the main shaft passes through the rear end cover, the shell and the front end cover, a rotating gear and a feeding gear are installed on the main shaft, the rotating gear and the feeding gear are driven by motors respectively, the rotating gear is located between the feeding gear and the pressure sensor, and a rear limiting ring is installed at the rear end of the main shaft and located at the rear end of the rear end cover.

[0008] Preferably, the main shaft is provided with external threads, the feeding gear is threadedly connected with the main shaft, the main shaft is provided with at least two key grooves, the rotating gear is provided with two clamping keys, and the clamping keys are clamped in the key grooves.

[0009] Preferably, the rear end cover is provided with a rear gasket on the side facing the pressure sensor, and the pressure sensor is provided with a front gasket on the other side.

[0010] Preferably, the front end and the rear end of the pressure sensor are respectively provided with a protrusion one and a protrusion two, the protrusion one is located at the outer circle of the front end of the pressure sensor, the protrusion two is located at the middle of the rear end of the pressure sensor, the protrusion one is in contact with the front gasket, and the protrusion two is in contact with the rear gasket.

[0011] Preferably, the rotating gear is T-shaped, and the rotating gear comprises a gear part one and a connecting part one, the diameter of the gear part one is greater than that of the connecting part one, a radial bearing one and a thrust bearing are installed on the outer side of the connecting part one, the radial bearing one is in contact with the front gasket, and the thrust bearing is located between the radial bearing one and the connecting part one.

[0012] Preferably, the feeding gear comprises a gear part two and two connecting parts two, the gear part two is located between the two connecting parts two, a plurality of steel balls are connected between the inner side of the gear part one and one of the connecting parts two, and a radial bearing two is installed on the outer surface of the other connecting part two and in the front end cover.

[0013] Preferably, a wave spring is arranged between the gear part two and the radial bearing two, and the wave spring is sleeved on the connecting part two.

[0014] Preferably, an arc-shaped groove one is arranged on the inner side of the shell facing the pressure sensor, an arc-shaped groove two corresponding to the arc-shaped groove one is arranged on the upper end of the pressure sensor, and a cylindrical pin is arranged between the arc-shaped groove one and the arc-shaped groove two.

[0015] Compared with the prior art, the drill bit pressure detection mechanism has the following beneficial effects:

[0016] The utility model discloses a feed gear is driven main shaft linear motion through the thread, and the main shaft is given the reaction force of feed gear back through the thread, and feed gear is given the force of rotary gear back, and rotary gear is given the pressure of pressure sensor, and when the axial pressure is received, pressure sensor will produce the slight deformation and obtains the corresponding pressure signal. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the embodiment schematic drawing of the utility model.

[0018] Figure 2 It is the embodiment sectional view of the utility model.

[0019] Figure 3 It is the embodiment local schematic drawing of the utility model.

[0020] Figure 4 It is the pressure sensor schematic drawing of the embodiment of the utility model.

[0021] Figure 5 It is the pressure sensor another visual angle schematic drawing of the embodiment of the utility model.

[0022] Figure 6 It is the main shaft schematic drawing of the embodiment of the utility model.

[0023] Figure 7 It is the main shaft another visual angle schematic drawing of the embodiment of the utility model.

[0024] Figure 8 It is the rotary gear schematic drawing of the embodiment of the utility model.

[0025] Figure 9 It is the rotary gear another visual angle schematic drawing of the embodiment of the utility model.

[0026] Figure 10 It is the feed gear schematic drawing of the embodiment of the utility model.

[0027] Figure 11 It is the shell schematic drawing of the embodiment of the utility model. DETAILED DESCRIPTION

[0028] The technical scheme in the embodiment of the utility model will be described clearly and completely in conjunction with the drawings in the embodiment of the utility model, and obviously, the described embodiment is only a part of the embodiment of the utility model, not all the embodiment. Based on the embodiment in the utility model, all other embodiments obtained by the ordinary skill in the art without making the creative labor belong to the range of the utility model protection.

[0029] As shown in the figure, the utility model discloses a drill bit pressure detection mechanism, including shell 1, front end cover 2, rear end cover 3 and main shaft 4, front end cover 2 and rear end cover 3 are installed through screw on both sides of shell 1, pressure sensor 5 is installed in the one end of shell 1 towards rear end cover 3, main shaft 4 passes through rear end cover 3, shell 1 and front end cover 2, and the rotation gear 6 and feed gear 7 are installed on main shaft 4, and the rotation gear 6 and feed gear 7 are driven respectively through motor, and the rotation gear 6 is located between feed gear 7 and pressure sensor 5, and the rear end of main shaft 4 is installed rear limiting ring 8, and rear limiting ring 8 is located at the rear end of rear end cover 3.

[0030] The rotation of the rotation gear 6 and the feed gear 7 is driven by different motors, when the rotation speed of the two rotation gears 6 and the feed gear 7 is the same, the main shaft 4 rotates in place without advancing. When it is necessary to simulate the rotation and advancement of the main shaft 4, the rotation speed of the feed gear 7 is changed, at this time, since the feed gear 7 is threadedly connected with the main shaft 4, and the feed gear 7 has a rotation speed difference with the main shaft 4, the feed gear 7 will drive the main shaft 4 to move linearly through the thread, the main shaft 4 provides a backward reaction force to the feed gear 7 through the thread, the feed gear 7 provides a backward force to the rotation gear 6, and the rotation gear 6 provides a pressure to the pressure sensor 5, and the above forces are all small pressures. When subjected to an axial pressure, the pressure sensor 5 will produce a small deformation and obtain a corresponding pressure signal. The utility model can directly transmit the force of the main shaft to the feed gear 7 to the pressure sensor 5, thereby improving the accuracy of pressure detection.

[0031] In an embodiment of the utility model, the main shaft 4 is provided with external threads 41, the feed gear 7 is threadedly connected with the main shaft 4, the main shaft 4 is provided with at least two key grooves 42, the rotation gear 6 is provided with two clamping keys 61, and the clamping keys 61 are clamped in the key grooves 42. The design of the clamping keys 61 and the key grooves 42 makes the rotation gear 6 able to drive the main shaft 4 to rotate, but the rotation gear 6 cannot move linearly, while the main shaft 4 can move linearly. The feed gear 7 is threadedly connected with the main shaft 4, when the rotation speed of the feed gear 7 is different from that of the main shaft 4, the feed gear 7 can move the main shaft 4 linearly similar to a lead screw.

[0032] In an embodiment of the utility model, the rear end cover 3 is provided with a rear gasket 9 on the side facing the pressure sensor 5, and the pressure sensor 5 is provided with a front gasket 10 on the other side. The rear gasket 9 and the front gasket 10 play a wear-resistant role, prevent the shell 1 from being crushed, and can also adjust the thickness of the rear gasket 9 and the front gasket 10 to prevent the pressure sensor from being squeezed when not working.

[0033] In an embodiment of the utility model, the front end and the rear end of pressure sensor 5 are equipped with convex one 51 and convex two 52 respectively, convex one 51 is located the outer ring of the front end of pressure sensor 5, convex two 52 is located the middle of the rear end of pressure sensor 5, convex one 51 contacts with front washer 10, convex two 52 contacts with rear washer 9.Convex one 51 and convex two 52 are used for the contact part of design with front washer 10 and rear washer 9, protect pressure sensor.

[0034] In an embodiment of the utility model, rotary gear 6 is T-shaped, rotary gear 6 includes gear part one 62 and connecting part one 63, the diameter of gear part one 62 is greater than the diameter of connecting part one 63, radial bearing one 11 and thrust bearing 12 are installed on the outside of connecting part one 63, radial bearing one 11 contacts with front washer 10, and thrust bearing 12 is located between radial bearing one 11 and connecting part one 63.Radial bearing one 11 plays the supporting role of rotary gear 6 here.Thrust bearing 12 is used to transmit pressure to the rear.

[0035] In an embodiment of the utility model, feed gear 7 includes gear part two 71 and two connecting part two 72, gear part two 71 is located between two connecting part two 72, a plurality of steel balls 13 are connected between the inside of gear part one 62 and one of connecting part two 72, and radial bearing two 14 is installed on the outer surface of the other connecting part two 72.Radial bearing two 14 is installed in front end cover 2.Radial bearing two 14 plays the role of supporting feed gear 7.

[0036] In an embodiment of the utility model, wave spring 15 is arranged between gear part two 71 and radial bearing two 14, and wave spring 15 is sleeved on connecting part two 72.The role of wave spring 15 is to eliminate the gap generated by axial assembly, to apply a certain pre-pressure to the rear part, to make the parts close to each other, at this time, pressure sensor 5 will generate a certain pre-pressure, which can be deducted or zeroed in advance when calculating pressure, and does not affect the final pressure detection result.

[0037] In an embodiment of the utility model, the side of shell 1 towards pressure sensor 5 is equipped with arc-shaped groove one 101, the upper end of pressure sensor 5 is equipped with arc-shaped groove two 53 corresponding to arc-shaped groove one, and cylindrical pin 16 is installed between arc-shaped groove one 101 and arc-shaped groove two 53.Cylindrical pin makes pressure sensor and rear end cover keep the angular position and do not rotate, and pressure sensor is matched with shell 1 and cylindrical pin with a small gap.In the axial direction, pressure sensor is still in a free state, which ensures that pressure sensor can normally deform and move after being pressed.

[0038] For the rear limit ring 8, the rear limit ring 8 rotates and feeds with the main shaft, when the rear limit ring 8 moves forward to contact with the rear end cover 3, the main shaft 4 will not continue to feed forward, at this time if the feed gear 7 continues to rotate, the main shaft 4 drives the feed gear to move backward due to the thread effect, a backward extrusion action is generated, the pressure sensor 5 is pressed to measure the pressure, the pressure changes sharply, and then an alarm signal is sent, and then the machine is stopped or the main shaft is retreated, so that the safety protection effect is achieved.

[0039] Compared with the traditional current method, the utility model can directly obtain the pressure of the main shaft, reduces the interference of gear transmission, the result is more accurate, and the response speed is fast.

[0040] The above content is only an example and description of the structure of the utility model, and various modifications or supplements or similar replacements can be made to the described specific embodiments by the person skilled in the art, as long as the structure of the utility model is not deviated or exceeds the range defined by the present application, which belongs to the protection range of the utility model.

Claims

1. A drill bit pressure detection mechanism, characterized by: The utility model provides a pressure sensor test device, including shell, front end cover, rear end cover and main shaft, and the front end cover and rear end cover are installed on both sides of shell through screw, pressure sensor is installed on the one end of shell towards rear end cover, the main shaft passes through rear end cover, shell and front end cover, and the rotation gear and feed gear are installed on the main shaft, and the rotation gear and feed gear are driven respectively through motor, and the rotation gear is located between feed gear and pressure sensor, and the rear end of main shaft is installed rear limiting ring, and rear limiting ring is located the rear end of rear end cover.

2. The drill bit pressure detection mechanism of claim 1, wherein: The main shaft is provided with external thread, the feed gear is connected with the main shaft in a threaded mode, the main shaft is provided with at least two key grooves, the rotation gear is provided with two clamping keys, and the clamping keys are clamped in the key grooves.

3. The drill bit pressure detection mechanism of claim 1, wherein: The rear end cover is provided with a rear gasket on the side towards the pressure sensor, and the pressure sensor is provided with a front gasket on the other side.

4. The drill bit pressure detection mechanism of claim 2, wherein: The front end and the rear end of the pressure sensor are respectively provided with protrusion one and protrusion two, the protrusion one is located at the outer ring of the front end of the pressure sensor, the protrusion two is located at the middle of the rear end of the pressure sensor, the protrusion one is in contact with the front gasket, and the protrusion two is in contact with the rear gasket.

5. The drill bit pressure detection mechanism of claim 4, wherein: The rotation gear is T-shaped, and the rotation gear comprises a gear part one and a connecting part one, the diameter of the gear part one is greater than the diameter of the connecting part one, a radial bearing one and a thrust bearing are installed on the outer side of the connecting part one, the radial bearing one is in contact with the front gasket, and the thrust bearing is located between the radial bearing one and the connecting part one.

6. The drill bit pressure detection mechanism of claim 5, wherein: The feed gear comprises a gear part two and two connecting parts two, the gear part two is located between the two connecting parts two, a plurality of steel balls are connected between the inner side of the gear part one and one of the connecting parts two, and a radial bearing two is installed on the outer surface of the other connecting part two.

7. The drill bit pressure detection mechanism of claim 6, wherein: A wave spring is arranged between the gear part two and the radial bearing two, and the wave spring is sleeved on the connecting part two.

8. The drill bit pressure detection mechanism of claim 1, wherein: An arc-shaped groove one is arranged on the inner side of the shell towards the pressure sensor, an arc-shaped groove two corresponding to the arc-shaped groove one is arranged on the upper end of the pressure sensor, and a cylindrical pin is arranged between the arc-shaped groove one and the arc-shaped groove two.

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