CN219152333U

CN219152333U - Feed pressure detection mechanism for EDU drilling equipment

Info

Publication number: CN219152333U
Application number: CN202320111943.6U
Authority: CN
Inventors: 郑华强; 樊恒; 易晟阳
Original assignee: Shanghai Maikeluo Automation Technology Co ltd
Current assignee: Shanghai Maikeluo Automation Technology Co ltd
Priority date: 2023-01-17
Filing date: 2023-01-17
Publication date: 2023-06-09
Anticipated expiration: 2033-01-17

Abstract

The utility model discloses a feeding pressure detection mechanism for EDU drilling equipment, which belongs to the field of EDU drilling equipment and comprises a main shaft and a sliding seat capable of driving the main shaft to feed, wherein the sliding seat comprises a mounting shell and a pressure sensor positioned in the mounting shell, through holes for the main shaft to pass through are formed in the mounting shell and the pressure sensor, a thrust bearing is arranged on the front surface of the pressure sensor, a ball bearing is arranged on the back surface of the mounting shell, the main shaft sequentially passes through the thrust bearing, the pressure sensor and the ball bearing, one side of the thrust bearing, close to the pressure sensor, is attached to the sensing surface of the pressure sensor, and one side, far from the pressure sensor, is contacted with a step surface on the main shaft. The pressure sensor on the sliding seat is used for detecting the feeding pressure of the main shaft, so that the linear pressure of the main shaft can be directly obtained, and the perpendicularity between the sensing surface of the pressure sensor and the axis of the main shaft can be ensured by adopting a double-bearing structure, and the measuring precision of the pressure sensor is improved.

Description

Feed pressure detection mechanism for EDU drilling equipment

Technical Field

The utility model relates to the field of handheld drilling equipment, in particular to a feed pressure detection mechanism for EDU drilling equipment.

Background

An increasingly growing number of conditions exist in the aerospace industry where multiple different materials are stacked together to form a thick sandwich and where a knife to finish hole is required. The materials of the interlayer are typically aluminum, composite materials and titanium, which are each of a variety of different grades. In general, the technological parameters of hole making (spindle rotation speed, feed speed, oil mist lubrication amount, etc.) of different materials have obvious differences, and the technological parameters of hole making of different brands of the same material may also have some differences. Therefore, in order to improve the hole making quality, the feeding force of the current stage of the cutter point and the material of the current interlayer need to be accurately mastered, namely, the feeding force is monitored in real time.

The traditional monitoring mode is a motor current detection method, whether the feeding force is changed or not is judged by monitoring the change of the current of a feeding motor, and the specific principle is that a servo motor drives a ball screw to realize the feeding of a main shaft, and the torque generated by the motor is essentially converted into the feeding force, and the larger the current of the motor is, the larger the generated torque is; meanwhile, the feeding speed is controlled by the rotating speed of the motor, and the servo motor always maintains a certain rotating speed at a certain feeding speed. When the perforation is performed to switch between the two sandwich materials, there is usually a significant change in the feed force, which results in a change in the current of the motor. So that the tip feed force detection can be realized by monitoring the current of the feed motor. The method has two main disadvantages, namely, the measurement mode of the motor current belongs to indirect measurement, the relative precision is lower, the method is not applicable to occasions with higher measurement sensitivity requirements, for example, the feeding force performance of aluminum and composite materials may not be different, and the motor current mode may be difficult to judge; secondly, the detection result is easily affected by other environmental factors, such as vibration generated in mechanical transmission, loss of torque caused by the transmission mechanism, and the like.

Disclosure of Invention

In order to overcome the defects of the existing motor current detection method, the utility model aims to solve the technical problems that: a feed pressure detection mechanism for EDU drilling equipment is provided with higher detection accuracy.

The technical scheme adopted for solving the technical problems is as follows:

the utility model provides a feed pressure detection mechanism for EDU drilling equipment, includes the main shaft and is located the terminal sliding seat that can drive the main shaft and feed of main shaft, the sliding seat includes the installation shell and is located the pressure sensor of installation shell, all be equipped with the through-hole that supplies the main shaft to pass on installation shell and the pressure sensor, pressure sensor's front is equipped with thrust bearing, and installation shell's the back is equipped with ball bearing, thrust bearing, pressure sensor and ball bearing are passed in proper order to the main shaft, and thrust bearing is close to pressure sensor's one side and is leaned on pressure sensor's on the sensing surface, keeps away from pressure sensor's one side and the epaxial step face contact of main. In the feeding process, the reverse acting force born by the main shaft can be transmitted to the pressure sensor through the thrust bearing, and the deformation of the pressure sensor in the detection process is extremely small, and the deformation is smaller than the axial clearance of the ball bearing, so that the axial force of the main shaft can not be transmitted to the ball bearing, and the feeding pressure can be directly obtained through the pressure sensor. The dual-bearing structure of the thrust bearing and the ball bearing is adopted, so that the concentricity of the main shaft and the pressure sensor can be ensured, the perpendicularity of the sensing surface of the pressure sensor and the axis of the main shaft is indirectly ensured, and the measurement accuracy of the pressure sensor during the operation of the main shaft is improved.

When the sliding seat is installed, the thrust bearing needs to be ensured to be in close contact with the pressure sensor and the main shaft, and the measurement accuracy is affected if an installation clearance exists. Therefore, preferably, the end of the main shaft is provided with an external thread, and the main shaft passes through the ball bearing and then compresses the whole sliding seat on the main shaft through the locking nut, so that precompression is generated between the thrust bearing and the step surface and between the thrust bearing and the pressure sensor. The lock nut sequentially extrudes the ball bearing, the mounting shell and the pressure sensor, so that two thrust washers of the thrust bearing are mutually pressed, and the mounting compactness and the measuring precision are ensured. Of course, the system needs to zero out the pre-pressure during the measurement or deduct it from the calculation.

For better transmission of the compression force generated by the lock nut, the ball bearing is preferably an angular contact ball bearing, and the axial force can be born from the tail end of the main shaft towards the front end of the main shaft. The angular contact ball bearing can better transmit the pressing force on the one hand, and on the other hand, does not bear reverse axial force, and does not influence the measurement accuracy of the pressure sensor.

For the pressure sensor of easy to assemble, the installation shell includes preceding shell and back lid that links to each other through the screw, pressure sensor passes through the fix with screw in preceding shell, the back of back lid is equipped with first mounting groove, ball bearing's outer lane is fixed in first mounting groove.

In order to better fix the thrust bearing, a second mounting groove is formed in the sensing surface of the sensor, and one thrust washer of the thrust bearing is fixed in the second mounting groove.

The beneficial effects of the utility model are as follows: the pressure sensor is arranged on the sliding seat to detect the feeding pressure of the main shaft, so that the linear pressure of the main shaft can be directly obtained, all parts are in close contact, errors caused by gaps among all transmission mechanisms and inertia moment caused by acceleration and deceleration are avoided, and the measuring precision is high; in addition, a double-bearing structure of a thrust bearing and a ball bearing is adopted between the main shaft and the sliding seat, so that concentricity of the main shaft and the pressure sensor can be ensured, verticality of a sensing surface of the pressure sensor and an axis of the main shaft is indirectly ensured, and measurement accuracy of the pressure sensor during operation of the main shaft is improved.

Drawings

FIG. 1 is a cross-sectional view of a slide mount of the present utility model assembled with a spindle;

FIG. 2 is an exploded view of the slide mount of the present utility model;

FIG. 3 is a schematic view of the structure of the present utility model installed in an EDU drilling apparatus;

the drawing is marked as 1-main shaft, 2-sliding seat, 3-lock nut, 4-feeding mechanism, 11-step surface, 12-external screw thread, 21-mounting shell, 22-pressure sensor, 23-through hole, 24-thrust bearing, 25-ball bearing, 211-front shell, 212-rear cover, 213-first mounting groove, 221-second mounting groove.

Detailed Description

The utility model is further described below with reference to the accompanying drawings.

As shown in fig. 1 and 2, the feeding pressure detection mechanism for the EDU drilling equipment comprises a main shaft 1 and a sliding seat 2 positioned at the tail end of the main shaft 1 and capable of driving the main shaft 1 to feed, wherein the sliding seat 2 comprises a mounting shell 21 and a pressure sensor 22 positioned in the mounting shell 21, through holes 23 for the main shaft 1 to pass through are formed in the mounting shell 21 and the pressure sensor 22, a thrust bearing 24 is arranged on the front surface of the pressure sensor 22, a ball bearing 25 is arranged on the back surface of the mounting shell 21, the main shaft 1 sequentially passes through the thrust bearing 24, the pressure sensor 22 and the ball bearing 25, one side, close to the pressure sensor 22, of the thrust bearing 24 is abutted to the sensing surface of the pressure sensor 22, and one side, far from the pressure sensor 22, is contacted with the step surface 11 on the main shaft 1. The tail end of the main shaft 1 refers to the end far away from the tip of the main shaft 1, the front surface of the pressure sensor 22 refers to the surface facing the tip of the main shaft 1, and the back surface of the mounting shell 21 refers to the surface facing away from the tip of the main shaft 1. The spindle 1 is fixed to the thrust bearing 24 and the ball bearing 25 without contacting the pressure sensor 22 during installation, and it is necessary to ensure that the thrust bearing 24 is pressed between the pressure sensor 2 and the stepped surface 11 of the spindle 1.

The principle of the utility model for detecting the feeding pressure is that, as shown in fig. 3, during the feeding process of the feeding mechanism 4 driving the sliding seat 2, the reverse acting force born by the main shaft 1 is transmitted to the pressure sensor 22 through the thrust bearing 24, and the deformation of the pressure sensor 22 during the detection process is extremely small, and is smaller than the axial play of the ball bearing 25, so that the axial force of the main shaft 1 is not transmitted to the ball bearing 25, and the feeding force can be directly obtained through the pressure sensor 22. The adoption of the double-bearing structure of the thrust bearing 24 and the ball bearing 25 ensures concentricity of the main shaft 1 and the pressure sensor 22, thereby indirectly ensuring perpendicularity between the sensing surface of the pressure sensor 22 and the axis of the main shaft 1 and improving the measurement precision of the pressure sensor 22 when the main shaft 1 runs.

When the slide seat 2 is mounted, it is necessary to ensure close contact of the thrust bearing 24 with the pressure sensor 22 and the step surface 11, and the measurement accuracy is affected if there is a mounting gap. Therefore, it is preferable that the outer thread 12 is provided at the end of the spindle 1, and the entire sliding seat 2 is pressed against the spindle 1 by the lock nut 3 after the spindle 1 passes through the ball bearing 25, so that a pre-compression force is generated between the thrust bearing 24 and the step surface 11 and the pressure sensor 22, which is cleared during the measurement process or subtracted during the calculation. When the lock nut 3 is screwed down, it presses the ball bearing 25, the mounting housing 21 and the pressure sensor 22 in order, so that the two thrust washers of the thrust bearing 24 are pressed against each other, ensuring the compactness of the mounting and the measurement accuracy. The pressure sensor 22 may be in communication with a display at the time of installation, and when the pressure sensor 22 detects pressure, it may indicate that the thrust bearing 24 has been compressed, and how much pre-compression is required may be determined based on the experience of the skilled person. The lock nut 3 only needs to be in contact with the inner ring of the ball bearing 25, the ball bearing 25 can transmit certain axial compression force, meanwhile, in the process of compressing the sliding seat 2, the inner ring of the ball bearing 25 can generate certain axial displacement to the tip end of the spindle 1, more axial compensation can be provided for the subsequent detection process, and the measurement range and the measurement precision of the pressure sensor 22 are improved.

In order to better transmit the axial compression force generated by the lock nut 3, the ball bearing 25 is preferably an angular contact ball bearing, and the axial force can be borne in the direction from the tail end of the main shaft 1 toward the front end of the main shaft 1. The angular contact ball bearing can better transmit the pressing force on the one hand, and can not bear the reverse axial force on the other hand, and the measuring precision of the pressure sensor 22 can not be influenced.

In a specific mounting structure, for facilitating the mounting of the pressure sensor 22, the mounting housing 21 includes a front case 211 and a rear cover 212 connected by screws, the pressure sensor 22 is fixed in the front case 211 by screws, a first mounting groove 213 is provided on the back surface of the rear cover 212, and the outer ring of the ball bearing 25 is fixed in the first mounting groove 213. For better fixing the thrust bearing 24, a second mounting groove 221 is provided on the sensing surface of the pressure sensor 22, and one of the thrust washers of the thrust bearing 24 is fixed in the second mounting groove 221.

Claims

1. A feed pressure detection mechanism for EDU drilling equipment, including main shaft (1) and be located sliding seat (2) that main shaft (1) end can drive main shaft (1) and feed, characterized by: the sliding seat (2) comprises an installation shell (21) and a pressure sensor (22) arranged in the installation shell (21), through holes (23) for a main shaft (1) to pass through are formed in the installation shell (21) and the pressure sensor (22), a thrust bearing (24) is arranged on the front face of the pressure sensor (22), a ball bearing (25) is arranged on the back face of the installation shell (21), the main shaft (1) sequentially passes through the thrust bearing (24), the pressure sensor (22) and the ball bearing (25), one side, close to the pressure sensor (22), of the thrust bearing (24) is attached to the sensing surface of the pressure sensor (22), and one side, far away from the pressure sensor (22), is in contact with the step surface (11) on the main shaft (1).

2. The feed pressure detection mechanism for an EDU drilling apparatus of claim 1, characterized in that: the tail end of the main shaft (1) is provided with an external thread (12), and the main shaft (1) passes through a ball bearing (25) and then compresses the whole sliding seat (2) on the main shaft (1) through a lock nut (3), so that precompression is generated between a thrust bearing (24) and a step surface (11) and between the thrust bearing and a pressure sensor (22).

3. The feed pressure detection mechanism for an EDU drilling apparatus of claim 2, characterized in that: the ball bearing (25) adopts an angular contact ball bearing, and the axial force which can be born by the angular contact ball bearing is directed from the tail end of the main shaft (1) to the front end of the main shaft (1).

4. The feed pressure detection mechanism for an EDU drilling apparatus of claim 1, characterized in that: the mounting shell (21) comprises a front shell (211) and a rear cover (212) which are connected through screws, the pressure sensor (22) is fixed in the front shell (211) through screws, a first mounting groove (213) is formed in the back surface of the rear cover (212), and the outer ring of the ball bearing (25) is fixed in the first mounting groove (213).

5. The feed pressure detection mechanism for an EDU drilling apparatus of claim 1, characterized in that: a second mounting groove (221) is formed in the sensing surface of the pressure sensor (22), and one thrust washer of the thrust bearing (24) is fixed in the second mounting groove (221).