A Monitoring System and Method for the Working State of a Medium Spray Direct Connection Spindle

Abstract

The present invention relates to the technical field of machining center spindles, and in particular to a working state monitoring system and method for a medium-jet direct-coupled spindle, which includes a drawbar, a core shaft, and a sleeve coaxially arranged from inside to outside in sequence; a clamping assembly is arranged at one end of the core shaft to clamp a tool; a jet channel is arranged inside the drawbar; the pre-tightening assembly includes a spring and contact beads arranged at one end of the core shaft close to the clamping assembly; there is a through accommodation space inside the fixed barrel; a plurality of grooves are opened at one end of the fixed barrel away from the core shaft, and pressure sensors are arranged in the grooves; the clamping barrel is arranged inside the accommodation space, and the outer wall of the clamping barrel abuts against the contact beads; the clamping barrel has a through space; a ball head is arranged at one end of the clamping barrel away from the core shaft; the ball seat is fixedly connected to the fixed barrel and is rotatably connected to the ball head; through holes are opened at the centers of the ball head and the ball seat; a pressing plate is installed at one end of the fixed barrel away from the core shaft and is fixedly connected to the clamping barrel through a fixed rod; a through hole is opened at the center of the pressing plate; the pressing plate contacts the pressure sensor. The present invention can effectively monitor whether the spindle is bent internally and improve the monitoring accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of machining center spindles, and particularly to a working state monitoring system and method for a medium spray direct connection spindle. Background Art

[0002] In the modern machinery manufacturing industry, as the core of high-efficiency automated production equipment, the performance of a machining center is directly related to machining accuracy, efficiency, and product quality; a medium spray direct connection spindle is a high-performance spindle type specifically designed for machining centers. Its characteristic is that the drive motor is directly connected to the spindle, reducing the intermediate links in the transmission chain, thereby improving the energy transmission efficiency and response speed, and it is one of the key components of a machining center.

[0003] Traditional spindle monitoring methods are no longer able to meet the growing demands; especially for monitoring subtle changes inside the spindle, such as whether the spindle is bent or deformed, etc., traditional means often ignore these subtle differences due to insufficient sensitivity, resulting in the inability to give early warnings in a timely manner, which may lead to serious machining errors and even equipment failures.

[0004] Therefore, there is an urgent need for a working state monitoring system and method for a medium spray direct connection spindle, which provides strong support for improving the reliability and intelligent level of machining centers. Summary of the Invention

[0005] The present invention provides a working state monitoring system and method for a medium spray direct connection spindle, which can effectively monitor whether problems such as bending or deformation occur in the spindle, and improve the reliability and stability of the spindle.

[0006] To achieve the above object, the present invention provides a working state monitoring system for a medium spray direct connection spindle, including:

[0007] A pull rod, a core shaft, and a sleeve coaxially arranged from the inside to the outside in sequence; one end of the core shaft is provided with a clamping assembly in contact with the pull rod for clamping a tool; a jet channel is arranged inside the pull rod from one end to the other end.

[0008] A preloading assembly, including a spring and contact beads, the preloading assembly is arranged at one end of the core shaft close to the clamping assembly, and the contact beads face the inside of the core shaft.

[0009] A fixed barrel, having a through accommodation space inside, and one end is sleeved on the sleeve; on the end face of the fixed barrel far from the core shaft, a plurality of grooves are opened along the length direction, and pressure sensors are arranged in the grooves.

[0010] A clamping barrel, arranged in the accommodation space and extending into the core shaft, the outer wall of the clamping barrel abuts against the contact beads; the clamping barrel has a through space from one end face to the other end face.

[0011] A ball head, fixedly arranged at one end of the clamping barrel far from the core shaft.

[0012] A ball seat is fixedly connected to one end of the fixed barrel away from the mandrel and is rotatably connected to the ball head;

[0013] Through holes are formed at the centers of both the ball head and the ball seat;

[0014] A pressure plate is installed at one end of the fixed barrel away from the mandrel and is fixedly connected to the clamping barrel through a fixing rod passing through the accommodating space; a hole is opened at the center of the pressure plate; the pressure plate contacts a pressure sensor.

[0015] Further, a rotatable air guide plate is arranged in the through space of the clamping barrel; a plurality of through holes arranged at intervals and penetrating from one end face to the other end face are formed in the air guide plate; the farther the through hole is from the axis of the clamping barrel, the larger the angle between the axis of the through hole and the axis of the clamping barrel.

[0016] Further, a limiting rod is further included. The limiting rod passes through the fixed barrel and the clamping barrel, and the limiting rod is connected to the air guide plate; the air guide plate rotates around the straight line where the limiting rod is located and drives the limiting rod to rotate; an observation strip is arranged at one end of the limiting rod away from the air guide plate, and the observation strip rotates around the limiting rod as the limiting rod rotates.

[0017] Further, a locking assembly is included. It is sleeved on the fixed barrel and, at one end close to the sleeve, passes through the fixed barrel and contacts the sleeve; the locking assembly is used to fix the fixed barrel on the sleeve and fix the pressure plate relative to the fixed barrel.

[0018] Further, the locking assembly includes a first outer shell, a clamping jaw, and a first end cover; the contour of the first outer shell corresponds to the outer wall of the fixed barrel close to the mandrel, and the first end cover is fixedly connected to the fixed barrel; a first thread groove is formed on the inner wall of the first outer shell; one end of the clamping jaw meshes with the first thread groove, and the other end passes through the fixed barrel and contacts the sleeve.

[0019] Further, an anti-slip groove is formed at one end of the clamping jaw that contacts the sleeve.

[0020] Further, the locking assembly includes a second outer shell, a limiting block, and a second end cover; the contour of the second outer shell corresponds to the outer wall of the fixed barrel away from the mandrel, and the second end cover is fixedly connected to the end face of the fixed barrel away from the mandrel; a second thread groove is formed on the inner wall of the second outer shell; the limiting block is arranged corresponding to the pressure sensor and meshes with the second thread groove.

[0021] Further, a long groove extends along the length direction of the inner wall of the fixed barrel towards the pressure plate; a hole is opened at the center of the end face of the second end cover close to the pressure plate, and an avoidance hole communicating with the center of the second end cover is formed at a position corresponding to the long groove.

[0022] Further, the fixed barrel is in a stepped shape, and the diameter of the fixed barrel is smaller the farther it is from the mandrel; a fixing block extends from the inner wall of the fixed barrel towards the axis of the fixed barrel, and the fixing block contacts one end of the ball seat away from the mandrel. The contour of the fixing block fits the end face of the ball seat and is used to fix the ball seat.

[0023] The present invention also provides a method for monitoring the working state of a central injection direct-connected spindle, comprising the following steps:

[0024] S10: Rotate the second housing to fix the pressing plate relative to the fixed barrel; put the fixed barrel on the sleeve, and extend the clamping barrel into the core shaft so that the clamping barrel is pressed by the pre-tightening assembly;

[0025] S20: rotating the first housing so that the clamping claws clamp the sleeve and fix the fixed barrel on the sleeve; spraying air into the pull rod;

[0026] S30: Control the main shaft to rotate, read the value P of each pressure sensor; detect the rotation amplitude of the observation bar;

[0027] If the maximum fluctuation △P of the pressure sensor reading is within the set range, and the rotation amplitude of the observation bar is within the set range, the spindle is normal;

[0028] If the maximum fluctuation △P of the pressure sensor reading exceeds the set range, and the rotation amplitude of the observation bar is within the set range, the monitoring system is abnormal and needs to be checked;

[0029] If the maximum fluctuation △P of the pressure sensor reading exceeds the set range, and the rotation amplitude of the observation bar exceeds the set range, the spindle is abnormal and needs to be checked.

[0030] The beneficial effects of the present invention are as follows: by designing a system and method for monitoring the working status of a center-spray direct-connected spindle, the monitoring of whether the core shaft inside the spindle is bent or deformed is converted into a method of triggering a pressure sensor with a pressure plate, so as to better observe whether the spindle is bent; in order to prevent the problem of the monitoring system itself, the state of the pull rod is judged by whether the air guide plate drives the observation bar to rotate, intuitively prompting the operator that the pull rod may have a problem of bending or deformation; the combination of these two methods can more accurately determine whether the spindle is abnormal, and help maintenance personnel to perform maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 It is a schematic diagram of the structure of the preload assembly on the direct-connected main shaft in the present invention;

[0033] Figure 2 It is a structural schematic diagram of the central injection direct-connected spindle working state monitoring system of the present invention installed on the spindle;

[0034] Figure 3 This is the front sectional view schematic diagram of the working state monitoring system of the middle injection direct connection main shaft in the present invention;

[0035] Figure 4 This is the left view schematic diagram of the working state monitoring system of the middle injection direct connection main shaft in the present invention after removing the pressure plate;

[0036] Figure 5 This is the structural schematic diagram of the clamping barrel and the pressure plate in the working state monitoring system of the middle injection direct connection main shaft in the present invention;

[0037] Figure 6 This is the structural schematic diagram of the locking assembly in the working state monitoring system of the middle injection direct connection main shaft in the present invention;

[0038] Figure 7 This is the component disassembly schematic diagram of the locking assembly in the working state monitoring system of the middle injection direct connection main shaft in the present invention;

[0039] Figure 8 This is the monitoring principle schematic diagram of the working state monitoring system of the middle injection direct connection main shaft in the present invention under normal spindle conditions;

[0040] Figure 9 This is the monitoring principle schematic diagram of the working state monitoring system of the middle injection direct connection main shaft in the present invention under the condition of spindle bending;

[0041] Reference numerals: 1, preloading assembly; 11, spring; 12, contact bead; 2, fixed barrel; 21, accommodation space; 22, groove; 23, pressure sensor; 24, long groove; 25, fixed block; 3, clamping barrel; 31, through space; 32, air guide plate; 33, through hole; 4, ball head; 5, ball seat; 6, pressure plate; 61, fixed rod; 7, limiting rod; 71, observation strip; 8, locking assembly; 81, first outer shell; 82, clamping jaw, 821, anti-slip groove; 83, first end cover; 84, second outer shell; 841, avoidance hole; 85, limiting block; 86, second end cover. Detailed implementation manners

[0042] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0043] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0044] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] A monitoring system for the working state of a middle injection direct connection main shaft, as Figures 1 to 7 shown, includes:

[0046] The basic structure of the middle injection direct connection main shaft includes a pull rod, a core shaft, and a sleeve coaxially arranged from the inside to the outside in sequence; a clamping assembly is arranged at one end of the core shaft in contact with the pull rod for clamping the tool; a jet channel is arranged inside the pull rod from one end to the other end.

[0047] The pre-tightening assembly 1 includes a spring 11 and a contact bead 12. The pre-tightening assembly 1 is arranged at one end of the core shaft close to the clamping assembly, and the contact bead 12 faces the inside of the core shaft; an adjusting screw can also be arranged in the pre-tightening assembly 1. By rotating the adjusting screw, the compression degree of the spring 11 can be increased or decreased, thereby changing the magnitude of the pre-tightening force; it is ensured that the clamping barrel 3 will not fall off when rotating with the main shaft.

[0048] The fixed barrel 2 has a through accommodation space 21 inside. One end is sleeved on the sleeve for fixing the whole monitoring system; on the end face of the fixed barrel 2 far from the core shaft, a plurality of grooves 22 are opened along the length direction, and pressure sensors 23 are arranged in the grooves 22.

[0049] The clamping barrel 3 is arranged in the accommodation space 21 and extends into the core shaft. The outer wall of the clamping barrel 3 abuts against the contact bead 12, which not only ensures that the clamping barrel 3 will not fall off but also does not restrict the rotation of the clamping barrel 3 with the main shaft; the clamping barrel 3 has a through space 31 from one end face to the other end face.

[0050] The ball head 4 is fixedly arranged at one end of the clamping barrel 3 far from the core shaft.

[0051] The ball seat 5 is fixedly connected to the end of the fixed barrel 2 far from the core shaft and is rotatably connected to the ball head 4.

[0052] Through holes are provided at the centers of both the ball head 4 and the ball seat 5.

[0053] The pressure plate 6 is installed at one end of the fixed barrel 2 away from the mandrel, and is fixedly connected to the clamping barrel 3 through the fixing rod 61 passing through the accommodation space 21; a hole is provided at the center of the pressure plate 6; the pressure plate 6 contacts the pressure sensor 23. When the pressure plate 6 shows a tendency to shake, the pressure plate 6 will trigger the pressure sensor 23 to display a reading.

[0054] The working principle of this monitoring system is as follows:

[0055] The preloading assembly 1 is always installed on the mandrel. When the direct-coupled spindle is working, as Figure 1 shown, the preloading assembly 1 is responsible for assisting in fixing the cutting tool; while in the use of this monitoring system, the preloading assembly 1 will, as Figures 8 to 9 shown, apply pressure to the outer side of the clamping barrel 3. After this monitoring system is installed, when the mandrel of the direct-coupled spindle is rotated, if the mandrel does not show bending, the pressure applied by the preloading assembly 1 to the outer side of the clamping barrel 3 will be as Figure 8 shown, and the pressures F are symmetric with each other, so that the clamping barrel 3 is stressed evenly in all directions during the rotation of the mandrel, and thus there will be no tendency to rotate skewed. The pressure plate 6 connected to the clamping barrel 3 will also be relatively stable, and the pressure sensor 23 in contact with the pressure plate 6 will not generate large numerical fluctuations.

[0056] If the mandrel is bent, the pressure applied by the preloading assembly 1 to the outer side of the clamping barrel 3 will be as Figure 9 shown, and the pressures F are no longer symmetric with each other, so that the clamping barrel 3 is stressed unevenly in all directions during the rotation of the mandrel, and there will be a tendency to rotate skewed. The pressure plate 6 connected to the clamping barrel 3 will also show a tendency to rotate skewed. A part of the pressure plate 6 will exert a large pressure on the pressure sensor 23, while the other part will instead reduce the pressure on the pressure sensor 23. And as the mandrel rotates, the position where the preloading assembly 1 applies pressure to the outer side of the clamping barrel 3 will change continuously, resulting in continuous changes in the tendency of the clamping barrel 3 and the pressure plate 6 to rotate skewed, and the pressure sensor 23 will generate large numerical fluctuations.

[0057] Preferably, a rotatable air guide plate 32 is provided in the through space 31 of the clamping barrel 3. The rotation axis of the air guide plate 32 is a straight line in the direction of its own diameter; the air guide plate 32 is provided with a plurality of through holes 33 arranged at intervals and penetrating from one end face to the other end face; the farther the through holes 33 are from the axis of the clamping barrel 3, the greater the angle between the axis of the through holes 33 and the axis of the clamping barrel 3, and the distance between the end of the through holes 33 close to the mandrel and the axis of the clamping barrel 3 is less than the distance between the end away from the mandrel and the axis of the clamping barrel 3.

[0058] When the gas is introduced into the tie rod, it will blow to the air guide plate 32. When the tie rod is not bent, the gas blown out from the tie rod will blow directly to the center of the air guide plate 32. In this case, the air flow can smoothly pass through the through hole 33, and the air flow S passing through each part of the air guide plate 32 is relatively uniform. Figure 8 As shown, the air guide plate 32 will not be pushed to rotate; once the pull rod is bent or deformed, the air flow path will change, and the air guide plate 32 will be tilted, resulting in uneven air flow S passing through various parts of the air guide plate 32, such as Figure 9 As shown, the air guide plate 32 will be pushed to swing, so that the bending condition of the direct-connected main shaft tie rod can be reflected by observing the swing amplitude of the air guide plate 32.

[0059] Preferably, Figure 5 As shown, it also includes a limit rod 7. Through holes with diameters much larger than that of the limit rod 7 are provided on the fixed barrel 2 and the clamping barrel 3. The limit rod 7 passes through the fixed barrel 2 and the clamping barrel 3 through these through holes, and the limit rod 7 is connected to the air guide plate 32; the air guide plate 32 rotates around the straight line where the limit rod 7 is located, and drives the limit rod 7 to rotate; an observation bar 71 is provided at the end of the limit rod 7 away from the air guide plate 32, and the observation bar 71 rotates around the limit rod 7 as the limit rod 7 rotates; since the air guide plate 32 is inside the main shaft, it is difficult to observe whether it is rotating, and it is also unclear whether there is a problem with the main shaft. Through the combination of the limit rod 7 and the observation bar 71, the movement of the air guide plate 32 is transmitted to the observation bar 71 outside the main shaft, which helps the staff to observe the state of the observation bar 71 more intuitively to determine whether there is a problem with the pull rod.

[0060] like Figure 3 As shown, it includes a locking assembly 8, which is sleeved on the fixed barrel 2 and close to one end of the sleeve, passing through the fixed barrel 2 and contacting the sleeve; the locking assembly 8 is used to fix the fixed barrel 2 on the sleeve to prevent the fixed barrel 2 from falling off when the main shaft rotates; the locking assembly 8 is also used to fix the pressure plate 6 relative to the fixed barrel 2 to avoid excessive shaking of the pressure plate 6 when the fixed barrel 2 is fixed on the sleeve, which will cause excessive pressure on the pressure sensor 23 and cause damage to it, thereby affecting the accuracy of the monitoring system.

[0061] Please refer to Figures 6 to 7The locking assembly 8 includes a first shell 81, a clamping claw 82 and a first end cover 83; the contour of the first shell 81 corresponds to the outer wall of the fixed barrel 2 close to the core shaft, and the first end cover 83 is fixedly connected to the fixed barrel 2; a first thread groove is provided on the inner wall of the first shell 81; the clamping claw 82 includes a sliding portion and a claw head; the sliding portion slides axially along the fixed barrel 2; the claw head is slidably connected to the sliding portion and slides radially along the fixed barrel 2, and an inclined hole is provided on the outer side of the fixed barrel 2, and the distance between the end of the inclined hole close to the core shaft and the axis of the fixed barrel 2 is smaller than the distance between the end away from the core shaft and the axis of the fixed barrel 2; one end of the sliding portion of the clamping claw 82 is meshed with the first thread groove, and one end of the claw head of the clamping claw 82 passes through the inclined hole of the fixed barrel 2 and contacts the sleeve;

[0062] This design ensures that the first shell 81 will be restricted by the first end cover 83 and will not slip out of the fixed barrel 2; and by rotating the first shell 81, the clamp 82 can be moved as a whole in the direction close to the sleeve, so that the claw head of the clamp 82 extends toward the sleeve to clamp the sleeve, thereby fixing the fixed barrel 2 on the sleeve, thereby improving the stability of the entire monitoring system and effectively improving the accuracy of monitoring.

[0063] Preferably, an anti-skid groove 821 is provided at one end of the claw head of the clamp 82 that contacts the sleeve; the anti-skid groove 821 increases the friction between the clamp 82 and the surface of the sleeve, ensuring that the clamp 82 firmly grasps the sleeve and prevents relative sliding between the two, thereby ensuring the stability and reliability of the monitoring system; avoiding wear on the sleeve surface due to excessive local pressure, extending the service life of the sleeve and the clamp 82, and reducing maintenance costs; the claw of the clamp 82 and the support arm can also be designed as a snap-on connection, which can be installed and disassembled without tools. When targeting different spindles or other situations, clamps 82 of different specifications and sizes can be used to work better.

[0064] Please refer to Figures 6 to 7 The locking assembly 8 includes a second shell 84, a limit block 85 and a second end cover 86; the contour of the second shell 84 corresponds to the outer wall of the fixed barrel 2 away from the core shaft, and the second end cover 86 is fixedly connected to the end face of the fixed barrel 2 away from the core shaft; a second threaded groove is provided on the inner wall of the second shell 84; the limit block 85 is arranged corresponding to the pressure sensor 23 and engages with the second threaded groove; the second end cover 86 limits the possibility of the second shell 84 sliding out of the fixed barrel 2; the limit block 85 can be moved by rotating the second shell 84, so that the limit block 85 is close to or away from the pressure plate 6. When installing the fixed barrel 2, the limit block 85 needs to be moved to support the pressure plate 6 to prevent the pressure plate 6 from shaking during the installation process.

[0065] like Figure 4As shown, a long groove 24 extends from the inner wall of the fixed barrel 2 along the length direction toward the pressure plate 6, and the long groove 24 is preferably designed to be evenly distributed around the axis, so that the fixing rods 61 are arranged one by one in the long groove 24; the second end cover 86 is opened at the center of the end face of the pressure plate 6, and an avoidance hole 841 connected to the center of the second end cover 86 is opened at the position corresponding to the long groove 24.

[0066] like Figure 3 As shown, the fixed barrel 2 is stepped, and the farther away from the core shaft, the smaller the diameter of the fixed barrel 2; such a design effectively reduces the overall volume and shifts the center of gravity of the monitoring system to make it closer to the end of the main shaft, thereby increasing the stability of the monitoring system during operation and reducing the error in judging the state of the main shaft; a fixed block 25 is extended from the inner wall of the fixed barrel 2 toward the axis of the fixed barrel 2, and the fixed block 25 contacts the end of the ball seat 5 away from the core shaft. The contour of the fixed block 25 fits with the end face of the ball seat 5 and is used to fix the ball seat 5. Extending the fixed block 25 from the fixed barrel 2 will not produce an additional complex structure and will not affect the movement of the fixed rod 61; and the fixed block 25 fixes the ball seat 5 from the circumference of the ball seat 5, making the pressure distribution of the ball head 4 on the ball seat 5 more uniform, avoiding displacement or loosening caused by vibration or impact, thereby ensuring the reliability of the rotational connection between the ball head 4 and the ball seat 5.

[0067] The present invention also provides a method for monitoring the working state of a central injection direct-connected spindle, comprising the following steps:

[0068] S10: Rotate the second housing 84 to fix the pressure plate 6 relative to the fixed barrel 2 to prevent the pressure plate 6 from shaking; put the fixed barrel 2 on the sleeve, extend the clamp barrel 3 into the core shaft, adjust the adjustment screw in the preload assembly 1, so that the clamp barrel 3 is pressed against by the contact bead 12, and fix the clamp barrel 3;

[0069] S20: Rotate the first housing 81 so that the clamping claws 82 clamp the sleeve and fix the fixed barrel 2 on the sleeve; spray air into the pull rod;

[0070] S30: Control the spindle to start. When the spindle starts, its core shaft and pull rod will rotate. During the rotation process, the value P of each pressure sensor 23 is read; the rotation amplitude of the observation bar 71 is detected;

[0071] The maximum fluctuation value (i.e., the difference between the maximum value and the minimum value of the pressure sensor 23) among all the fluctuation values ​​P of the pressure sensor 23 is recorded as the maximum fluctuation value ΔP;

[0072] If the maximum fluctuation △P of the reading of the pressure sensor 23 is within the set range, it means that the detected bending degree of the mandrel is within the acceptable range; and the rotation amplitude of the observation bar 71 is within the set range, it means that the detected bending degree of the pull rod is within the acceptable range; at this time, the bending degree of the mandrel and the pull rod is not beyond the limit, and the main shaft is normal;

[0073] If the maximum fluctuation amount △P of the indication of the pressure sensor 23 exceeds the set range, it indicates that the detected bending degree of the mandrel is beyond the limit; while the rotation amplitude of the observation bar 71 is within the set range, indicating that the detected bending degree of the pull rod is within the acceptable range; since the mandrel and the pull rod directly connected to the main shaft are almost in close contact, they usually bend together. Then, it may be that the monitoring system is abnormal at this time. For example, the clamping barrel 3 is skewed or deformed during installation. It is necessary to check the monitoring system. If the inspection result of the monitoring system is good, then re-test;

[0074] If the maximum fluctuation amount △P of the indication of the pressure sensor 23 exceeds the set range, it indicates that the detected bending degree of the mandrel is beyond the limit; and if the rotation amplitude of the observation bar 71 exceeds the set range, it indicates that the detected bending degree of the pull rod is beyond the limit; the abnormalities of both detection structures indicate that the main shaft is abnormal, and it is necessary to check the main shaft.

[0075] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A central injection direct-connected spindle working status monitoring system, characterized in that: include: A pull rod, a mandrel and a sleeve are coaxially arranged in sequence from the inside to the outside; a clamping assembly is arranged at one end of the mandrel to contact the pull rod and to clamp the tool; An air jet channel is provided in the pull rod from one end to the other end; A pre-tightening assembly (1) comprising a spring (11) and a contact bead (12), wherein the pre-tightening assembly (1) is arranged at one end of the mandrel close to the clamping assembly, and the contact bead (12) faces the interior of the mandrel; A fixed barrel (2) has a through accommodating space (21) inside, and one end is sleeved on the sleeve; an end surface of the fixed barrel (2) away from the core shaft is provided with a plurality of grooves (22) along the length direction, and a pressure sensor (23) is arranged in the groove (22); A clamp barrel (3) is arranged in the accommodating space (21) and extends into the core shaft, and the outer wall of the clamp barrel (3) abuts against the contact bead (12); the clamp barrel (3) has a through space (31) from one end surface to the other end surface; A ball head (4) is fixedly arranged at an end of the clamp barrel (3) away from the core shaft; A ball seat (5) is fixedly connected to an end of the fixed barrel (2) away from the core shaft, and is rotatably connected to the ball head (4); A through hole is formed at the center of the ball head (4) and the center of the ball seat (5); A pressure plate (6) is installed at one end of the fixed barrel (2) away from the core shaft and is fixedly connected to the clamping barrel (3) through a fixing rod (61) passing through the accommodating space (21); a hole is opened in the center of the pressure plate (6); and the pressure plate (6) contacts the pressure sensor (23).

2. The central injection direct-connected spindle working status monitoring system according to claim 1 is characterized in that: A rotatable air guide plate (32) is arranged in the through space (31) of the clamp barrel (3); the air guide plate (32) is provided with a plurality of through holes (33) arranged at intervals and extending from one end surface to the other end surface; the farther the through hole (33) is from the axis of the clamp barrel (3), the greater the angle between the axis of the through hole (33) and the axis of the clamp barrel (3).

3. The central injection direct-connected spindle working status monitoring system according to claim 2 is characterized in that: The invention also comprises a limiting rod (7), wherein the limiting rod (7) passes through the fixed barrel (2) and the clamping barrel (3), and the limiting rod (7) is connected to the air guide plate (32); the air guide plate (32) rotates around the straight line where the limiting rod (7) is located, and drives the limiting rod (7) to rotate; an observation strip (71) is arranged at one end of the limiting rod (7) away from the air guide plate (32), and the observation strip (71) rotates around the limiting rod (7) as the limiting rod (7) rotates.

4. The central injection direct-connected spindle working status monitoring system according to claim 1 is characterized in that: It comprises a locking assembly (8), which is sleeved on the fixed barrel (2) and close to one end of the sleeve, passes through the fixed barrel (2) and contacts the sleeve; the locking assembly (8) is used to fix the fixed barrel (2) on the sleeve and fix the pressure plate (6) relative to the fixed barrel (2).

5. The central injection direct-connected spindle working status monitoring system according to claim 4 is characterized in that: The locking assembly (8) comprises a first shell (81), a clamping claw (82) and a first end cover (83); the contour of the first shell (81) corresponds to the outer wall of the fixed barrel (2) close to the core shaft, and the first end cover (83) is fixedly connected to the fixed barrel (2); a first thread groove is provided on the inner wall of the first shell (81); one end of the clamping claw (82) is engaged with the first thread groove, and the other end passes through the fixed barrel (2) and contacts with the sleeve.

6. The central injection direct-connected spindle working status monitoring system according to claim 5 is characterized in that: An anti-slip groove (821) is formed at one end of the clamping claw (82) contacting the sleeve.

7. The central injection direct-connected spindle working status monitoring system according to claim 4 is characterized in that: The locking assembly (8) comprises a second outer shell (84), a limit block (85) and a second end cover (86); the contour of the second outer shell (84) corresponds to the outer wall of the fixed barrel (2) away from the core shaft, and the second end cover (86) is fixedly connected to the end face of the fixed barrel (2) away from the core shaft; a second thread groove is provided on the inner wall of the second outer shell (84); the limit block (85) is arranged corresponding to the pressure sensor (23) and meshes with the second thread groove.

8. The central injection direct-connected spindle working status monitoring system according to claim 7 is characterized in that: The inner wall of the fixed barrel (2) extends a long groove (24) along the length direction toward the pressure plate (6); the second end cover (86) is provided with a hole near the center of the end surface of the pressure plate (6), and a avoidance hole (841) connected to the center of the second end cover (86) is provided at a position corresponding to the long groove (24).

9. The central injection direct-connected spindle working status monitoring system according to claim 1 is characterized in that: The fixing barrel (2) is in a stepped shape, and the diameter of the fixing barrel (2) decreases as it is farther from the core shaft; a fixing block (25) extends from the inner wall of the fixing barrel (2) toward the axis of the fixing barrel (2); the fixing block (25) contacts an end of the ball seat (5) away from the core shaft; the contour of the fixing block (25) matches the end face of the ball seat (5) and is used to fix the ball seat (5).

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