Air curtain end face foreign matter inspection device

Abstract

The invention discloses an air curtain end face foreign matter inspection device which comprises a mandrel and further comprises a pull rod, the pull rod is slidably connected into the mandrel, an air channel is formed in the mandrel, a first channel is formed in the pull rod, a second channel is formed in the first channel, a fixing cylinder is arranged in the mandrel, and a first pressure valve is arranged in the fixing cylinder. And the second channel is communicated with the gas channel through the first pressure valve. According to the air curtain end face foreign matter inspection device provided by the invention, when air flows in the pull rod and air pressure is relatively low, the first pressure valve cannot be closed at the moment, so that the air curtain is formed on the end face of the mandrel, and whether foreign matters exist on the end face of the mandrel or not in a cutter clamping state can be detected through the air curtain formed on the end face of the mandrel; due to the fact that the liquid pressure is high, the first pressure valve can be closed, the liquid can flow out of the center of the core shaft through the pull rod, and the first pressure valve can be automatically opened or closed according to the fact that gas or liquid flows in the core shaft.

Description

Technical Field

[0001] The invention relates to the technical field of main shaft production of a machining center, and in particular to a foreign matter inspection device for an air curtain end face. Background Art

[0002] The machine tool spindle refers to the axis on the machine tool that drives the workpiece or tool to rotate. The spindle components are usually composed of the spindle, bearings and transmission parts (gears or pulleys). In the machine, it is mainly used to support transmission parts such as gears and pulleys, transmit motion and torque, such as the machine tool spindle; some are used to clamp workpieces, such as the mandrel. Usually, a gas channel or liquid channel is set inside the mandrel for the circulation of cutting fluid or gas.

[0003] According to the invention patent application with publication number: CN109827720A and publication date of 2019-05-31, an air curtain test device is disclosed, including a main shaft, an air intake channel 1 is arranged on one side inside the main shaft, an air flow channel 1 is arranged inside the main shaft, a total pressure sensor is arranged inside the air flow channel 1, an air flow channel 2 is arranged at one end inside the main shaft, an electromagnetic valve is arranged inside the air flow channel 2, a front cover is arranged at one end of the main shaft, an air intake channel 2 and an air flow channel 3 are arranged on one side inside the front cover, a pressure sensor is arranged inside the air flow channel 3, a waterproof ring is arranged between the front cover and the main shaft, and the total pressure sensor, the electromagnetic valve and the pressure sensor are electrically connected to the control host respectively, and the control host is connected to the display. Its main technical effect is: it can display the pressure change curve, and then through the detection results, it is convenient to adjust the waterproof ring in a targeted manner, so that the waterproof performance of the main shaft is optimized.

[0004] In the prior art, the core shaft needs to be connected to an air pump or a cutting fluid pump at the same time. The air pump is used to blow away impurities, and the cutting fluid pump is used to provide cutting fluid during processing. However, the pressure valve used in the prior art cannot automatically switch between water and ventilation due to insufficient pressure in the pressure valve when passing cutting fluid and ventilation. Therefore, an air curtain end face foreign matter inspection device is proposed. Summary of the invention

[0005] The purpose of the present invention is to provide an air curtain end face foreign matter inspection device, aiming to solve the problem that the pressure valve used in the prior art cannot achieve automatic switching of water and air when passing cutting fluid and ventilation due to insufficient pressure in the pressure valve.

[0006] In order to achieve the above object, the present invention provides the following technical solutions: An air curtain end face foreign object inspection device includes a mandrel and also a pull rod. The pull rod is slidably connected inside the mandrel. A gas passage is provided inside the mandrel, a first passage is provided inside the pull rod, a second passage is provided on the first passage, a fixed cylinder is provided inside the mandrel, a first pressure valve is provided inside the fixed cylinder, and the second passage is communicated with the gas passage through the first pressure valve.

[0007] Preferably, the first pressure valve includes an installation cylinder, an adjustment nut, a first spring, a second spring and a sealing ring. One end of the installation cylinder is provided with a through groove, one end of the adjustment nut is movably connected inside the through groove, the sealing ring is fixedly installed on the outer wall of the adjustment nut, one ends of the first spring and the second spring are both connected to the inside of the adjustment nut, the other ends of the first spring and the second spring are both connected to the adjustment nut, and the first spring is sleeved inside the second spring.

[0008] Preferably, a receiving cavity is provided inside the mandrel, and the receiving cavity is communicated with the gas passage.

[0009] In the above technical solution, an air curtain end face foreign object inspection device provided by the present invention has the following beneficial effects: In this invention, the gas passage provided on the mandrel is communicated with the second passage provided on the pull rod through the first pressure valve. When gas flows inside the pull rod, the air pressure is small, and at this time, the first pressure valve cannot be closed, so the gas can enter the gas passage through the first pressure valve, forming an air curtain on the end face of the mandrel. Whether there are foreign objects on the end face of the mandrel can be detected through the air curtain formed on the end face of the mandrel when the tool clamping state is detected. When liquid flows inside the pull rod, since the liquid pressure is strong, the first pressure valve can be closed, so the liquid can flow out from the center of the mandrel through the pull rod, and the first pressure valve can be automatically opened or closed according to whether the gas or liquid flows inside the mandrel. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required to be used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention, and those of ordinary skill in the art can also obtain other drawings according to these drawings.

[0011] Figure 1 It is a schematic diagram of the overall sectional structure provided by an embodiment of the present invention; Figure 2 It is a schematic diagram of the connection relationship of the gas passage provided by an embodiment of the present invention; Figure 3 It is a schematic diagram of the connection relationship of the fixed pipe provided by an embodiment of the present invention; Figure 4Schematic diagram of the connection structure of the first pressure valve provided by an embodiment of the present invention; Figure 5 Schematic three-dimensional structure diagram of the first pressure valve provided by an embodiment of the present invention; Figure 6 Schematic assembly structure diagram of the first pressure valve provided by an embodiment of the present invention; Figure 7 Schematic diagram of a partial assembly structure provided by an embodiment of the present invention; Figure 8 Schematic diagram of the tool clamping state structure provided by an embodiment of the present invention; Figure 9 Schematic diagram of the tool retraction state provided by an embodiment of the present invention.

[0012] Explanation of reference numerals: 1. Mandrel; 11. Gas channel; 12. Accommodation cavity; 13. Second pressure valve; 2. Pull rod; 21. First channel; 22. Second channel; 23. Shunt channel; 24. Second pressure valve; 3. Fixed cylinder; 31. Installation groove; 4. First pressure valve; 41. Installation cylinder; 42. Adjusting nut; 43. First spring; 44. Second spring; 45. Sealing ring; 46. Through groove. Detailed implementation manners

[0013] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further introduced in detail below with reference to the accompanying drawings.

[0014] Please refer to Figure 1 —7, an air curtain end face foreign object inspection device, including a mandrel 1, and further including a pull rod 2, the pull rod 2 is slidably connected inside the mandrel 1, a gas channel 11 is provided inside the mandrel 1, a first channel 21 is provided inside the pull rod 2, a second channel 22 is provided on the first channel 21, a fixed cylinder 3 is provided inside the mandrel 1, a first pressure valve 4 is provided inside the fixed cylinder 3, and the second channel 22 is connected to the gas channel 11 through the first pressure valve 4.

[0015] Specifically, the mandrel 1 is a conventional spindle structure in the prior art, and a tool installation cavity is opened on the end face of the mandrel 1 for accommodating the tool for connection, such as Figure 1 and Figure 7As shown in the figure, a gas passage 11 is provided inside the mandrel 1. Specifically, the number of gas passages 11 is several, and the several gas passages 11 are arranged in a circumferential array inside the mandrel 1. The gas passage 11 has an input end and two output ends. One output end communicates with the end face of the mandrel 1, and the other output end communicates with the tool mounting cavity. A pull rod 2 is provided inside the mandrel 1. Specifically, the pull rod 2 is slidably connected inside the mandrel 1. A first passage 21 is provided inside the pull rod 2. Preferably, the first passage 21 penetrates through the pull rod 2. A second passage 22 is provided on the outer wall of the pull rod 2. One end of the second passage 22 communicates with the first passage 21. A fixed cylinder 3 is fixedly connected to the outer wall of the pull rod 2. An installation groove 31 is provided on the outer wall of the fixed cylinder 3. A first pressure valve 4 is installed inside the installation groove 31. The second passage 22 communicates with the first passage 21 through the first pressure valve 4.

[0016] As shown in Figure 7, a communication cavity 32 is provided inside the fixed pipe 3. A shunt passage 23 is provided on the first passage 21. Specifically, the shunt passage 23 penetrates through the pull rod 2. Both ends of the shunt passage 23 are located inside the communication cavity 32. The first passage 21 communicates with the shunt passage 23. Gas or liquid can flow inside the first passage 21.

[0017] In this invention, the gas passage 11 provided on the mandrel 1 communicates with the second passage 22 provided on the pull rod 2 through the first pressure valve 4. When gas flows inside the pull rod 2, the air pressure is relatively small, and at this time, the first pressure valve 4 cannot be closed. Therefore, the gas can enter the gas passage 11 through the first pressure valve 4, so that an air curtain is formed on the end face of the mandrel 1. When detecting the tool clamping state, it can be determined whether there is foreign matter on the end face of the mandrel 1 through the air curtain formed on the end face of the mandrel 1. When liquid flows inside the pull rod 2, since the liquid pressure is relatively strong, the first pressure valve 4 can be closed. Therefore, the liquid can flow out from the center of the mandrel 1 through the pull rod 2. It is possible to automatically open or close the first pressure valve 4 according to whether the gas or liquid flowing inside the mandrel 1.

[0018] As an embodiment provided by the present invention, as Figure 5 and Figure 6As shown in the figure, specifically, the first pressure valve 4 includes an installation cylinder 41, an adjusting nut 42, a first spring 43, a second spring 44 and a sealing ring 45. Specifically, the installation cylinder 41 is a cylindrical structure with an open top. A through groove 46 is provided on the inner wall of the bottom inside the installation cylinder 41. One end of the adjusting nut 42 is movably connected in the through groove 46. An arc-shaped groove is provided on the outer wall of the adjusting nut 42. The sealing ring 45 is connected to the adjusting nut 42 through the arc-shaped groove, which can prevent the sealing ring 45 from coming off. The first spring 43 and the second spring 44 are both sleeved on the outer wall of the adjusting nut 42. Specifically, one end of each of the first spring 43 and the second spring 44 abuts against the bottom inside the installation cylinder 41, and the other end of each of the first spring 43 and the second spring 44 abuts against the adjusting nut 42. The elastic forces of the first spring 43 and the second spring 44 drive the adjusting nut 42 to move away from the through groove 46 of the installation cylinder 41. Specifically, the outer diameter of the sealing ring 45 on the adjusting nut 42 is adapted to the inner diameter of the installation cylinder 41, so that when the pressure on one side of the adjusting nut 42 is greater than the elastic forces of the first spring 43 and the second spring 44, the adjusting nut 42 can move towards the inside of the installation cylinder 41, and then the sealing ring 45 abuts against the inner wall of the installation cylinder 41 to form a seal, preventing gas and liquid from passing through.

[0019] As a further embodiment provided by the present invention, as Figure 7 shown, a receiving cavity 12 is provided on the inner wall of the mandrel 1. Specifically, the receiving cavity 12 is communicated with the gas passage 11. Through the receiving cavity 12, the adjusting nut 42 can abut against the outer wall of the mandrel 1, so that the first pressure valve 4 is in an open state all the time. When gas flows through the first passage 21 inside the mandrel 1, the gas flows through the first passage 21 to the second passage 22 and enters the inside of the receiving cavity 12 through the second passage 22. Since the gas pressure is small, the adjusting nut 42 inside the installation cylinder 41 cannot be pressed down, and the gas can directly pass through the through groove 46 on the installation cylinder 41 and enter the gas passage 11 to form an air curtain on the end face of the mandrel 1.

[0020] As Figure 4 shown, a second pressure valve 24 is provided at the end of the pull rod 2. Specifically, the second pressure valve 24 is a conventional model on the market and is prior art, so it will not be elaborated here. When gas is passed through the first passage 21 inside the mandrel 1, since the second pressure valve 24 is a conventional model on the market and the gas pressure is small, the second pressure valve 24 cannot be opened at this time, and the gas will pass through the second passage 22, the receiving cavity 12 and then enter the first pressure valve 4, and then enter the gas passage 11 through the first pressure valve 4.

[0021] Working principle: When machining on a machining center, cutting fluid flows inside the first channel 21 inside the mandrel 1. When the cutting fluid passes through the second channel 22, since the second channel 22 communicates with the gas channel 11 through the first pressure valve 4, and due to the excessive pressure of the cutting fluid, it will abut against the adjusting nut 42 of the first pressure valve 4 and push the adjusting nut 42 to move towards the inside of the mounting cylinder 41, thereby squeezing the first spring 43 and the second spring 44, making the sealing ring 45 on the adjusting nut 42 abut against the inner wall of the mounting cylinder 41, so that the two sides of the first pressure valve 4 are not communicated. Furthermore, the cutting fluid can only flow through the first channel 21 towards the second pressure valve 24 at the end of the pull rod 2 and flow outside the pull rod 2 through the second pressure valve 324; When gas flows inside the first channel 21 inside the mandrel 1, when the cutting fluid passes through the second channel 22, due to the low gas pressure, the adjusting nut 42 is pushed by the first spring 43 and the second spring 44, and the sealing ring 45 on the adjusting nut 42 is separated from the mounting cylinder 41. Then, it enters the inside of the mounting cylinder 41 through the gap between the sealing ring 45 and the mounting cylinder 41, and finally enters the gas channel 11 through the through groove 46 provided inside the mounting cylinder 41; When the gas reaches the end face of the mandrel 1 through the gas channel 11, as Figure 7 shown, since the gas channel 11 has two output ends, an air curtain can be formed on the end face of the mandrel 1; As Figure 8 and Figure 9 shown, when clamping the tool and no cutting fluid flows inside the first channel 21, at this time, gas flows inside the first channel 21, which is used to detect whether there is foreign matter at the end of the mandrel 1 where the tool is clamped. When the contact surface of the tool handle does not fully fit with the end face of the mandrel 1, there is a large gap between the end face of the mandrel 1 and the contact surface of the tool handle, and the gas flow channel is in an open state. At this time, the air pressure detection sensor can detect the air pressure, and then judge whether there is foreign matter on the end face, and then give an alarm.

[0022] The air pressure detection sensor only needs to be kept connected to the gas flow channel to detect the air pressure in the gas flow channel to judge whether there is foreign matter on the end face. The air pressure detection sensor can be replaced by a gas flow rate sensor, and the air flow rate is used to judge whether air flows inside the gas flow channel, and then judge whether there is foreign matter on the end face.

[0023] The first spring 43 and the second spring 44 mentioned in this article have elastic coefficients that meet the technical requirements of the technical solution of the present invention.

[0024] Those skilled in the art can understand that other similar connection methods can also implement the present invention. For example, welding, bonding or screwing, etc.

[0025] Only some exemplary embodiments of the present invention have been described by way of illustration. Undoubtedly, for those of ordinary skill in the art, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An air curtain end foreign object inspection device, including a mandrel (1), characterized in that, It further includes a pull rod (2), the pull rod (2) is slidably connected inside the mandrel (1), a gas passage (11) is provided inside the mandrel (1), a first passage (21) is provided inside the pull rod (2), a second passage (22) is provided on the first passage (21), a fixed cylinder (3) is provided inside the mandrel (1), a first pressure valve (4) is provided inside the fixed cylinder (3), and the second passage (22) is communicated with the gas passage (11) through the first pressure valve (4).

2. The air curtain end face foreign object inspection device according to claim 1, characterized in that, The first pressure valve (4) includes an installation cylinder (41), an adjusting nut (42), a first spring (43), a second spring (44) and a sealing ring (45). One end of the installation cylinder (41) is provided with a through groove (46), one end of the adjusting nut (42) is movably connected inside the through groove (46), the sealing ring (45) is fixedly installed on the outer wall of the adjusting nut (42), one ends of the first spring (43) and the second spring (44) are both connected to the inside of the adjusting nut (42), the other ends of the first spring (43) and the second spring (44) are both connected to the adjusting nut (42), and the first spring (43) is sleeved inside the second spring (44).

3. The air curtain end face foreign object inspection device according to claim 1, characterized in that, An accommodation cavity (12) is provided inside the mandrel (1), and the accommodation cavity (12) is communicated with the gas passage (11).

4. The air curtain end face foreign object inspection device according to claim 1, characterized in that A second pressure valve (24) is provided at the end of the pull rod (2).

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