A main shaft with a four-axis structure and a mounting method thereof

Abstract

The present application relates to the technical field of machining center, and particularly discloses a main shaft with four-axis structure, which comprises a four-axis body, a fourth cover plate is detachably connected to the side end of the four-axis body, a rotating part is arranged in the four-axis body, a first four-axis spindle box and a second four-axis spindle box are rotatably arranged at the side end of the four-axis body, the first four-axis spindle box and the second four-axis spindle box are integrated, and an electric spindle is arranged in the second four-axis spindle box; the rotating part comprises a driving source, and the driving source is electrically connected with a controller. The main shaft with four-axis structure can realize the machining of various complex surfaces of a workpiece after one-time clamping, improve the machining efficiency of the workpiece, and eliminate the error caused by multiple clamping of the workpiece. The application of the main shaft with four-axis function structure vertical (horizontal) machining center is popularized, the structural rigidity is good, and the machining center can bear a large cutting force.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of machining center, in particular to a main shaft with four-axis structure and a mounting method thereof. BACKGROUND

[0002] The main shaft with four-axis function structure is commonly used in vertical machining center or horizontal machining center, and is the core power structure of the vertical (horizontal) machining center. The main shaft with four-axis function structure directly affects the performance, motion accuracy and quality of the machining workpiece of the machining center. Therefore, the design of the main shaft with four-axis function structure is very important.

[0003] At present, the vertical machining center (three-axis machine) usually moves in x and y axial directions in the horizontal plane, and the main shaft moves in z axial direction perpendicular to the workbench (ground). This type of machine tool is usually used for machining small and medium-sized parts, and can only machine the top surface of the part. The machining of the side surface of the part has certain limitations. The horizontal machining center (usually four-axis machine) is usually a reverse t-shaped structure, and the main shaft moves in parallel with the ground in x and y axial directions. The workbench (horizontal rotary table) moves in z axial direction along the main shaft direction in the horizontal plane. This type of machine tool is usually used for machining medium and large-sized parts, and can machine the four side surfaces of the part by matching with the horizontal rotary table. The machining of the top surface of the part has certain limitations.

[0004] For some common small and medium-sized parts on the market at present, most of them need six-surface machining. The vertical or horizontal machining center needs to be clamped multiple times to complete the machining of the six surfaces. Some parts even need to be alternately machined by the vertical machining center and the horizontal machining center to complete the six-surface machining. Such multiple clamping and alternating use of multiple machining machine tools result in long machining time of the parts, reduced machining accuracy, long clamping time and high machining cost. SUMMARY

[0005] The purpose of the present application is to provide a main shaft with four-axis structure to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0007] A main shaft with four-axis structure, comprising a four-axis body, a fourth axis cover plate being detachably connected to the side end of the four-axis body, a rotating part being arranged in the four-axis body, a first four-axis spindle box and a second four-axis spindle box being rotatably arranged at the side end of the four-axis body, the first four-axis spindle box and the second four-axis spindle box being integrated, an electric spindle being arranged in the second four-axis spindle box; the rotating part comprises a driving source, the driving source being electrically connected to a controller, and the rotating part is responsible for driving the electric spindle to rotate and tilt so as to be perpendicular to the surface to be machined.

[0008] Further, the driving source is a four-axis servo motor, the end of the four-axis servo motor is provided with a transmission component, the four-axis servo motor is connected with a transmission mandrel through the transmission component, the outer end of the transmission mandrel is fixedly connected with a shaft coupling, the outer end of the shaft coupling is fixedly connected with a transmission flange, the transmission flange is fixedly connected with the second four-axis main shaft box, so that the power of the four-axis servo motor is transmitted to the second four-axis main shaft box.

[0009] Further, the inside of the four-axis body is provided with a working cavity, and the transmission mandrel and the transmission flange are matched with the working cavity.

[0010] Further, the transmission component comprises a speed reduction mechanism, the side end of the speed reduction mechanism is fixedly connected with a second transmission pulley, the output end of the four-axis servo motor is fixedly connected with a driving shaft, the outer end of the driving shaft is sleeved with a first transmission pulley, the outer side of the first transmission pulley is provided with a synchronous belt, and the first transmission pulley and the second transmission pulley are both in transmission connection with the synchronous belt.

[0011] Further, the transmission mandrel is connected with the speed reduction mechanism through bolts, the outer end of the transmission mandrel is provided with an air brake component, the air brake component comprises an air source, the air source is in electrical signal connection with a controller, and the air brake component is responsible for braking the transmission mandrel to make it stop at a set position.

[0012] Further, the inside of the four-axis body is fixedly connected with an oil seal, the inside of the oil seal is in rotary connection with the transmission flange, and the outside of the oil seal is in rotary connection with the inside of the second four-axis main shaft box.

[0013] Further, a bearing is arranged between the transmission flange and the working cavity, the outer ring of the bearing is connected with the four-axis body through bolts, and the inner ring of the bearing is connected with the transmission flange through bolts.

[0014] A mounting method of a main shaft with a four-axis structure is applied to the main shaft with the four-axis structure, and comprises the following steps.

[0015] Firstly, the four-axis body is placed on a platform, the speed reduction mechanism is arranged on the mounting hole in the four-axis body, the second transmission pulley is installed in the positioning stop of the speed reduction mechanism, and the transmission mandrel is installed on the output shaft mounting surface of the speed reduction mechanism.

[0016] The air brake position of the air brake device is checked to ensure that the brake ring is embraced.

[0017] The bearing is installed on the bearing mounting surface of the four-axis body, the transmission flange is installed in the inner hole and the end surface of the bearing, the locking bolts are tightened in sequence and symmetrically, the shaft coupling is installed between the hole of the transmission flange and the outer circle of the transmission mandrel, the bolts of the shaft coupling are tightened in sequence and symmetrically, the transmission flange and the transmission mandrel become an integral whole, and the oil seal is installed between the four-axis body and the transmission flange.

[0018] The first transmission pulley is installed on the output shaft of the four-axis servo motor, the four-axis motor mounting plate is installed on the four-axis body, and the bolts are tightened; the synchronous belt is sleeved on the first transmission pulley; the four-axis servo motor and the first transmission pulley are installed on the four-axis motor mounting plate, and the synchronous belt is sleeved on the second transmission pulley, and the four-axis servo motor locking bolt is tightened;

[0019] The electric spindle is installed in the spindle box hole, the spindle box and the electric spindle are installed on the transmission flange, and the bolts are tightened;

[0020] Overall inspection: the assembled four-axis structure is erected and placed beside the marble hexagonal body, and the standard mandrel is installed on the electric spindle.

[0021] In the above technical solution, the main shaft with the four-axis structure provided by the application has the following beneficial effects:

[0022] The purpose is to expand the use function of the vertical (horizontal) machining center, ensure the part machining precision when the fourth axis participates in linkage, effectively improve the ability to absorb the vibration generated during tool cutting, and well prevent the vibration during starting and stopping of the fourth axis. Therefore, it is used on high-speed, high-precision and high-rigidity machine tools. After the workpiece is clamped once, the machining of various complex surfaces in space can be completed, the machining efficiency of the workpiece is improved, and the error caused by multiple clamping of the workpiece is eliminated. The main shaft with the fourth axis function structure vertical (horizontal) machining center is popularized, the structural rigidity is good, and the machining can withstand a larger cutting force.

[0023] It should be understood that the foregoing general description and the following detailed description are merely exemplary and explanatory, rather than limiting the present disclosure.

[0024] The present application file provides an overview of various implementations or examples of the technology described in the present disclosure, and is not a comprehensive disclosure of the full scope or all features of the disclosed technology. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0026] Figure 1 The overall external structure schematic diagram provided for embodiment 1 of the present application;

[0027] Figure 2 The first four-axis spindle box and the second four-axis spindle box internal structure schematic diagram provided for embodiment 1 of the present application;

[0028] Figure 3The rotating part part-section structure schematic view provided for the embodiment 1 of the present application;

[0029] Figure 4 The four-axis body section structure schematic view provided for the embodiment 1 of the present application;

[0030] Figure 5 The four-axis body whole structure schematic view provided for the embodiment 1 of the present application;

[0031] Figure 6 The transmission flange structure schematic view provided for the embodiment 1 of the present application;

[0032] Figure 7 The four-axis body top internal section structure schematic view provided for the embodiment 1 of the present application;

[0033] Figure 8 The brake front part structure schematic view provided for the embodiment 2 of the present application;

[0034] Figure 9 The telescopic part section structure schematic view provided for the embodiment 2 of the present application.

[0035] The figure mark explanation:

[0036] 1, four-axis body; 2, fourth axis cover plate; 3, rotating part; 31, driving source; 32, transmission mandrel; 33, coupling; 34, transmission flange; 35, working cavity; 4, first four-axis main shaft box; 5, second four-axis main shaft box; 6, transmission part; 61, speed reduction mechanism; 62, second transmission pulley; 63, synchronous belt; 7, air brake part; 71, air channel; 72, sealing cover plate; 73, gas storage disc; 74, air brake disc; 8, brake front part; 81, friction block; 82, first movable groove; 83, elastic member; 84, telescopic part; 841, hollow block; 842, T-shaped block; 843, magnetic sheet; 844, reset member; 9, oil seal; 10, bearing; 11, electric spindle. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the embodiments of the present disclosure clearer, the technical scheme of the embodiments of the present disclosure will be described clearly and completely below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by a person of ordinary skill in the art without any inventive effort fall within the protection scope of the present disclosure.

[0038] Embodiment 1, please refer to Figures 1-7The utility model provides a fourth axis function's structure of main shaft, assembles on the common vertical (horizontal) type machining center, realizes four -axis linkage through with vertical type machining center combination, realizes five -axis linkage with horizontal type machining center combination, through above -mentioned combination, can realize work piece once clamping, completes the machining of various complex surface in space, improves work piece's machining efficiency and eliminates the error produced by work piece multiple clamping.

[0039] The fourth axis is a rotating axis. When a polyhedron needs to be machined, the electric spindle 11 needs to be rotated to the corresponding machining surface. Through the rotating component 3, the first four-axis spindle box 4 and the second four-axis spindle box 5 can be rotated to the corresponding angle, and the machining of the polyhedron can be completed without multiple clamping.

[0040] The fourth axis function's structure of main shaft, assembles on the common vertical (horizontal) type machining center, realizes four -axis linkage through with vertical type machining center combination, realizes five -axis linkage with horizontal type machining center combination, through above -mentioned combination, can realize work piece once clamping, completes the machining of various complex surface in space, improves work piece's machining efficiency and eliminates the error produced by work piece multiple clamping.

[0041] In further provided embodiments of the application, the driving source 31 is a four-axis servo motor, the end of the four-axis servo motor is provided with a transmission component 6, the four-axis servo motor is connected with a transmission mandrel 32 through the transmission component 6, the outer end of the transmission mandrel 32 is fixedly connected with a shaft coupling 33, the outer end of the shaft coupling 33 is fixedly connected with a transmission flange 34, the transmission flange 34 is fixedly connected with the second four-axis spindle box 5, so that the power of the four-axis servo motor is transmitted to the second four-axis spindle box 5.

[0042] In further provided embodiments of the application, the inside of the four-axis body 1 is provided with a working cavity 35, the transmission mandrel 32 and the transmission flange 34 are mutually adapted with the working cavity 35.

[0043] In further provided embodiments of the application, the transmission component 6 includes a speed reduction mechanism 61, the side end of the speed reduction mechanism 61 is fixedly connected with a second transmission pulley 62, the output end of the four-axis servo motor is fixedly connected with a driving shaft, the outer end of the driving shaft is sleeved with a first transmission pulley, the outside of the first transmission pulley is provided with a synchronous belt 63, the first transmission pulley and the second transmission pulley 62 are all transmissionally connected with the synchronous belt 63.

[0044] Through the controller, the four-axis servo motor is started, the four-axis servo motor rotates with the first transmission pulley, the first transmission pulley moves with the synchronous belt 63, the synchronous belt 63 rotates with the second transmission pulley 62, so that the speed reducer 61 can rotate, the speed reducer 61 rotates with the transmission mandrel 32, the transmission mandrel 32 rotates with the transmission flange 34 through the shaft coupling 33, the transmission flange 34 is connected with the second four-axis spindle box 5, and finally the second four-axis spindle box 5 can rotate to the set position.

[0045] The synchronous belt 63 and the transmission pulley are synchronous toothed belts and transmission pulleys, and the synchronous toothed belts and the transmission pulleys are driven, so that the vibration generated by the operation of the servo motor is well cut off; due to the equipped speed reducer, the output torque is multiplied, and the rigidity of the four-axis is strengthened; furthermore, the coaxial arrangement completely solves the action delay or even the crawling phenomenon of the main shaft with the fourth axis structure during starting and continuous movement, changes the stress of the servo motor, and improves the service life and safety factor of the main shaft with the fourth axis functional structure.

[0046] In the further provided embodiment of the application, the transmission mandrel 32 is connected with the speed reducer 61 through bolts, the transmission mandrel 32 drives the air brake component 7 provided at the outer end, the air brake component 7 comprises an air source, the air source is connected with the controller through an electrical signal, and the air brake component 7 is responsible for braking the transmission mandrel 32 to make it stop at a set position.

[0047] The air brake component 7 comprises a gas storage disc 73 and an air brake disc 74 arranged outside the gas storage disc 73, and the air brake disc 74 brakes the transmission mandrel 32 through annular locking.

[0048] The four-axis body 1 is provided with an air channel 71, and the outer part of the four-axis body 1 is provided with a sealing cover plate 72, the sealing cover plate 72 is provided with an air inlet hole, the air source can be an air pump, the output end of the air pump is connected with the air inlet hole of the sealing cover plate 72, the air brake component 7 comprises a piston rod and an air brake disc 74, the air brake disc 74 is in an arc structure and located outside the transmission mandrel 32, when braking is needed, the air pump drives the air brake disc 74 to move through air pressure, the air brake disc 74 is close to and presses the transmission mandrel 32, and the purpose of brake braking is achieved.

[0049] In the further provided embodiment of the application, the inner side of the four-axis body 1 is fixedly connected with an oil seal 9, the inner side of the oil seal 9 is rotatably connected with the transmission flange 34, and the outer side of the oil seal 9 is rotatably connected with the inner side of the second four-axis spindle box 5.

[0050] The oil seal 9 not only realizes the sealing between the four-axis body 1 and the second four-axis spindle box 5, but also can reduce the friction force during rotation.

[0051] The transmission flange 34 and the working cavity 35 are provided with a bearing 10, the outer ring of the bearing 10 is connected with the four-axis body 1 through bolts, and the inner ring of the bearing 10 is connected with the transmission flange 34 through bolts.

[0052] The application discloses a mounting method of a main shaft with a four-axis structure.

[0053] In the application, the four-axis body 1 is placed on a platform, the speed reducer 61 is arranged on the mounting hole in the four-axis body 1, and the gap of the mounting surface of the speed reducer 61 is checked by using a feeler gauge; if there is a gap, the gap needs to be repaired.

[0054] The transmission mandrel 32 is mounted on the mounting surface of the output shaft of the speed reducer 61, bolts are arranged, and the bolts are symmetrically tightened in sequence; the coaxiality of the transmission mandrel 32 and the output shaft of the speed reducer 61 is checked by rotating the rotating shaft of the speed reducer 61, and the coaxiality is required to be less than or equal to 0.02 mm.

[0055] The air brake position of the air brake device four-axis body 1 is placed, bolts are arranged, and the bolts are symmetrically tightened in sequence; the gap between the air brake inner hole and the transmission mandrel 32 is checked by using a 0.02 mm feeler gauge, and the gap is required to be uniform on the whole circumference, so that the brake is ensured to be embraced.

[0056] The bearing 10 is mounted on the bearing 10 mounting surface of the four-axis body 1, the coaxiality of the inner hole of the bearing 10 and the transmission mandrel 32 is checked, and the coaxiality is required to be less than or equal to 0.02 mm; the transmission flange 34 is mounted in the inner hole and the end surface of the bearing 10, and the locking bolts are symmetrically tightened in sequence; the shaft coupling 33 is mounted between the hole of the transmission flange 34 and the outer circle of the transmission mandrel 32, and the bolts of the shaft coupling 33 are symmetrically tightened in sequence, so that the transmission flange 34 and the transmission mandrel 32 become an integrated whole; the coaxiality of the hole of the transmission flange 34 and the end surface runout are checked by rotating the first transmission belt pulley, driving the output shaft of the speed reducer 61, the shaft coupling 33, the bearing 10 and the transmission flange 34 to rotate, and detecting the coaxiality and the end surface runout, and the coaxiality and the end surface runout are required to be less than or equal to 0.02 mm; and the oil seal 9 is mounted between the four-axis body 1 and the transmission flange 34.

[0057] Install the second transmission pulley 62 onto the output shaft of the four-axis servo motor, tighten it with radial bolts, check the radial runout of the transmission pulley 2, the required radial runout is: 0.01mm; install the four-axis motor mounting plate onto the four-axis body 1 and tighten it with bolts; install the tightening block onto the four-axis body 1 and tighten it with bolts; put the synchronous belt 63 on the second transmission pulley 62; install the four-axis servo motor and the second transmission pulley 62 onto the four-axis motor mounting plate, and at the same time put the synchronous belt 63 on the second transmission pulley 62, tighten the four-axis servo motor locking bolt; tighten the synchronous belt 63 through the tightening block.

[0058] Install the electric spindle 11 into the spindle box hole. Use a 0.02mm feeler gauge to check for clearance between the spindle 11 and the spindle box. The gauge should not be inserted within 0.02mm. Install the spindle box and electric spindle 11 onto the transmission flange 34 and tighten with bolts. General Inspection: Stand the assembled four-axis structure upright (with the electric spindle 11 horizontal) and place it against a marble hexagonal block. Install a standard mandrel into the electric spindle 11. Using the flat surface of the marble hexagonal block as a reference, use a micrometer to calibrate the upper busbar of the standard mandrel. Ensure the upper busbar of the standard mandrel has an error of 0-0 within a 250mm range. Swing the spindle box, electric spindle 11, and standard mandrel, and check the value of the standard mandrel's busbar at each position on the flat surface of the marble hexagonal block. The perpendicularity between the axis of rotation and the axis of the electric spindle 11 must be ≤0.02mm. Install the fourth-axis cover 2 onto the four-axis block 1. Install the fourth-axis spindle box cover onto the spindle box.

[0059] The spindle-with-fourth-axis design offers superior rigidity, absorbing assembly errors on mounting surfaces and achieving high precision. This expands the performance of vertical and horizontal machining centers. High speed, high load, high rigidity, and high precision are becoming the future trend in industrial product processing.

[0060] Example 2, please refer to Figures 8-9 The difference between Example 2 and Example 1 is that the following technical features are added to the main body of the solution of a main shaft with four shafts structure:

[0061] A braking pre-component is provided outside the transmission core shaft. The braking pre-component includes a plurality of first movable grooves 82 and second movable grooves on the outer wall of the transmission core shaft 32. The plurality of first movable grooves 82 and second movable grooves are evenly distributed in an annular shape. A telescopic member 84 is slidably connected in the second movable groove. An elastic member 83 is fixedly connected between the telescopic member 84 and the second movable groove respectively. A friction block 81 is fixedly connected to the end of the telescopic member 84. The friction block 81 is initially located in the first movable groove 82.

[0062] The friction block 81 is made of the same material as the transmission mandrel 32, when the rotation speed of the transmission mandrel 32 is too fast, under the action of centrifugal force, the friction block 81 first moves outward, and rubs with the air brake disc 74 in the rotation process, under the action of friction, the telescopic part 84 starts to slide, so that the friction block 81 is in contact with the air brake disc 74 before braking; when the braking starts, the friction block 81 can be immediately pressed to brake.

[0063] Specifically, the telescopic part 84 includes a hollow block 841 and a T-shaped block 842, the hollow block 841 is made of iron material, the bottom of the T-shaped block 842 is fixedly connected with a magnetic sheet 843, the magnetic sheet 843 is initially attached to the hollow block 841, the hollow block 841 and the T-shaped block 842 are further fixedly connected with a reset part 844, the reset part 844 can be a reset spring, when the transmission mandrel 32 stops rotating, the friction force is greatly reduced after extrusion, so that the telescopic part 84 slides to the initial position under the action of the elastic part 83, and the friction block 81 loses the block under the action of the reset part 844 and stays in the second movable groove under the condition of small acceleration, that is, when the motor shaft is tilted at a small angle, the friction block 81 will not come out.

[0064] When the motor shaft is tilted at a large angle, in order to quickly respond to the signal, compared with small angle steering, it is necessary to rotate to the corresponding angle more quickly, in order to shorten the effective braking time of the air brake, the centrifugal inertia can be used to drive the friction block 81 outside the transmission mandrel 32 outward and rub with the air brake disc 74 to separate from the original groove, so that the speed is reduced and cannot be returned to the original position, and when the braking position is reached, the air brake is driven at the same time, at this time, the air brake disc 74 has contacted with the friction block 81, the gap between them is reduced, so that the braking time can be greatly shortened; so as to ensure that the rotation time of more than 90 degrees can be similar to the rotation time and braking time of less than 90 degrees, and the braking effect can also reach the ideal effect.

[0065] The above only describes some exemplary embodiments of the present application by way of illustration, without doubt, for ordinary skilled in the art, the described embodiments can be modified in various ways without departing from the spirit and scope of the present application. Therefore, the above figures and description are illustrative in nature, and should not be understood as limiting the scope of the claims of the present application.

Claims

1. A main shaft with four shafts structure, comprising a four-shaft body, the side ends of which are detachably connected to a fourth shaft cover plate, characterized in that: The quadruple body is provided with a rotating component, and the side ends of the quadruple body are rotatably provided with a first four-axis spindle box and a second four-axis spindle box, the first four-axis spindle box and the second four-axis spindle box are connected as a whole, and the second four-axis spindle box is provided with an electric spindle; The rotating component includes a driving source, the driving source electrical signal is connected to the controller, and the rotating component is responsible for driving the electric spindle to rotate and tilt so that it is perpendicular to the surface to be processed; The driving source is a four-axis servo motor, and a transmission component is provided at the end of the four-axis servo motor. The four-axis servo motor is connected to a transmission core shaft through the transmission component. The outer end of the transmission core shaft is provided with an air brake component, and the air brake component includes an air source. The air source is electrically connected to the controller. The air brake component is responsible for braking the transmission core shaft to a set position. A braking pre-component is provided outside the transmission core shaft, and the braking pre-component includes a plurality of first movable grooves and second movable grooves on the outer wall of the transmission core shaft, and the plurality of first movable grooves and second movable grooves are evenly distributed in an annular shape, and a telescopic member is slidably connected in the second movable groove, and elastic members are fixedly connected between the telescopic member and the second movable groove respectively, and a friction block is fixedly connected to the end of the telescopic member, and the friction block is initially located in the first movable groove.

2. The main shaft with four shafts structure according to claim 1, characterized in that: The outer end of the transmission core shaft is fixedly connected to a coupling, the outer end of the coupling is fixedly connected to a transmission flange, and the transmission flange is fixedly connected to the second four-axis spindle box, so that the power of the four-axis servo motor is transmitted to the second four-axis spindle box.

3. The main shaft with four shafts structure according to claim 2, characterized in that: A working cavity is provided inside the quadriaxial body, and the transmission core shaft and the transmission flange are adapted to the working cavity.

4. The main shaft with four shafts structure according to claim 3, characterized in that: The transmission component includes a reduction mechanism, a side end of the reduction mechanism is fixedly connected to a second transmission pulley, an output end of the four-axis servo motor is fixedly connected to a drive shaft, an outer end of the drive shaft is sleeved with a first transmission pulley, a synchronous belt is provided on the outside of the first transmission pulley, and the first transmission pulley and the second transmission pulley are both connected to the synchronous belt transmission.

5. The main shaft with four shafts structure according to claim 4, characterized in that: The transmission core shaft is connected to the speed reduction mechanism through bolts.

6. The main shaft with four shafts structure according to claim 5, characterized in that: An oil seal is fixedly connected to the inner side of the four-axis body, the inner side of the oil seal is rotatably connected to the transmission flange, and the outer side of the oil seal is rotatably connected to the inner side of the second four-axis main spindle box.

7. The main shaft with four shafts structure according to claim 6, characterized in that: A bearing is provided between the transmission flange and the working chamber. The outer ring of the bearing is connected to the quadriaxial body through bolts, and the inner ring of the bearing is connected to the transmission flange through bolts.

8. A method for installing a main shaft with four shafts, applied to the main shaft with four shafts structure according to any one of claims 1 to 7, characterized in that: The method includes the following steps: First, place the quad-axis on the platform, install the reduction mechanism on the mounting hole inside the quad-axis, install the second transmission pulley into the positioning stop of the reduction mechanism, and install the transmission core shaft onto the mounting surface of the reduction mechanism output shaft; Place the air brake device on the quadcopter's air brake position and check to ensure the brake is in contact with the air brake. Install the bearing into the bearing mounting surface of the quad-axis, install the transmission flange into the inner hole and end surface of the bearing, and tighten the locking bolts symmetrically in sequence; install the coupling between the upper hole of the transmission flange and the outer circle of the transmission core shaft, and tighten the bolts on the coupling symmetrically in sequence to make the transmission flange and the transmission core shaft become one, and install the oil seal between the quad-axis and the transmission flange; Install the first transmission pulley onto the output shaft of the four-axis servo motor, install the four-axis motor mounting plate onto the four-axis body, and tighten it with bolts; put the synchronous belt onto the first transmission pulley; install the four-axis servo motor and the first transmission pulley onto the four-axis motor mounting plate, and put the synchronous belt onto the second transmission pulley at the same time, and tighten the locking bolts of the four-axis servo motor; Install the electric spindle into the spindle box hole, install the spindle box and the electric spindle onto the transmission flange, and tighten with bolts; General inspection: Stand the assembled four-axis structure upright and place it next to the marble hexagonal block, and install the standard mandrel on the electric spindle.

Images