Main shaft loading module

Abstract

The utility model discloses a main shaft loading module which comprises a sliding table, a balance support is hinged to the sliding table, a left balance supporting block is arranged at one end of the balance support, a right balance supporting block is arranged at the other end of the balance support, and a left balance weight pull rod is arranged on the left balance supporting block. A right counterweight pull rod is arranged on the right balance supporting block; a right counterweight hanging block is arranged at the bottom end of the right counterweight pull rod; a stowage assembly is arranged above the right side of the balance bracket; according to the lever balance principle, the weight of the main shaft can be completely balanced by arranging the left counterweight hanging block and the right counterweight hanging block, and the main shaft is driven to ascend and descend through the stowage assembly. When milling and grinding are needed, the main shaft can be fixed to the sliding table through the rigid locking mechanism, and therefore constant flexible force loading and rigid machining can be freely switched. According to the utility model, micro-force control can be realized, and the product processing precision is effectively improved; the integration degree of the main shaft loading module is high, and the main shaft loading module can be well matched with existing equipment.

Description

Technical Field

[0001] The utility model relates to the technical field of numerically controlled machine tools, and more specifically, particularly to a spindle loading module. Background Art

[0002] In the polishing industry, the most common defects are pitting, orange peel and scratches. The most common defects in grinding are chatter marks, wire drawing and scratches. The main causes of these problems are excessive pressure and vibration of the grinding wheel.

[0003] The conventional practice in the market is to hang the spindle mechanism on the pressure sensor to control the pressure, but the pressure sensor itself is an elastic body, and its deformation will affect the processing accuracy. Most importantly, this force control method requires timely control by the computer, that is, the current force value of the sensor is actually lagging. Because the vibration problem is not solved, the instantaneous force value measured by the pressure sensor has large peaks and troughs, which will affect the surface effect of grinding and polishing.

[0004] In addition, with this processing method, it is difficult to achieve micro-force control on a multi-axis machine tool due to the large friction resistance of the mechanism and the insufficient resolution of the larger range of force and pressure sensors. Utility Model Content

[0005] The utility model provides a spindle loading module to solve the problems raised in the above background technology. To achieve the above purpose, the utility model provides the following technical solutions: a spindle loading module, installed on a CNC machine tool, including a slide, a balance bracket connected to the slide, and the balance bracket can swing left and right around a hinge point;

[0006] A left balancing support block is provided at one end of the balancing support, and a right balancing support block is provided at the other end, a left counterweight pull rod is provided on the left balancing support block, a right counterweight pull rod is provided on the right balancing support block, and a right counterweight hanging block is provided at the bottom end of the right counterweight pull rod; a loading assembly is provided on the upper right side of the balancing support, and the loading assembly includes a loading support, and a motor screw loading unit and a cylinder loading unit installed on the loading support;

[0007] The motor screw loading unit includes a driving motor, a screw slider mechanism and a movable loading block; the movable loading block is slidably arranged on the loading bracket, the driving motor is transmission-connected to the screw slider mechanism, and the screw slider mechanism is threadedly connected to the movable loading block;

[0008] The cylinder loading unit comprises a pair of loading cylinders, the loading cylinders are fixedly mounted on the loading bracket, and a small counterweight is arranged on the piston rod of the loading cylinder.

[0009] The front of the sliding table is provided with a restraint guide rail, on which a left counterweight hanging block is slidably arranged. A main shaft is arranged on the left counterweight hanging block, and the left counterweight hanging block is connected to the bottom end of the left counterweight pull rod; a pressure sensor is arranged at the bottom of the sliding table, and the pressure sensor is arranged in cooperation with the main shaft.

[0010] Preferably, a rigid locking mechanism is arranged on the sliding table and is used to fix the main shaft at a certain position on the restraint guide rail.

[0011] Preferably, a hinge seat is arranged at the top of the sliding table. The balance bracket is of a rectangular frame structure. The balance bracket is sleeved on the hinge seat, and its two side walls are respectively hinged to the hinge seat, and the hinge points of the balance bracket are close to the right side of the balance bracket.

[0012] Preferably, the small counterweight block is of a structure that can be quickly disassembled or a structure that can increase or decrease the counterweight size.

[0013] Preferably, the restraint guide rail is any one of a roller linear guide rail, a cylindrical linear guide rail or a ball linear guide rail.

[0014] Preferably, a gravity loading limit mechanism is further arranged on the sliding table and is in cooperation with the main shaft. The gravity loading limit mechanism includes a suspension bracket, a connecting bracket, a limit rod, a brake seat, a brake arm and a brake cylinder; the suspension bracket is connected to the sliding table, the bottom of the connecting bracket is connected to the main shaft, and the top is connected to the limit rod; the brake seat and the brake cylinder are respectively arranged on the suspension bracket, the piston rod of the brake cylinder is connected to the brake seat, and the limit rod vertically penetrates through the brake seat.

[0015] Preferably, the main shaft loading module is installed on the Z-axis of a numerical control machine tool, and the numerical control machine tool is a three-axis machine, a four-axis machine, a five-axis machine, a large gantry milling machine, a six-axis manipulator or a non-standard device.

[0016] Preferably, the sliding table is of a cuboid hollow structure, and a plurality of weight-reducing holes are arranged on its side walls.

[0017] Preferably, the main shaft is connected to the left counterweight hanging block through a double swivel head mechanism.

[0018] Preferably, it further includes a horizontal micro-force floating loading component; the horizontal micro-force floating loading component includes a horizontal slide rail component, a main support plate, a blocking block, a lateral locking cylinder and a lateral loading cylinder; the main support plate is slidably connected to the left counterweight lifting block through the horizontal slide rail component; the horizontal slide rail component includes a lateral guide rail and a lateral slider, the lateral guide rail is arranged at the bottom of the left counterweight lifting block, the lateral slider is slidably arranged on the lateral guide rail, and the main support plate is connected to the lateral slider; the main shaft is arranged at the bottom of the main support plate; the blocking block is arranged on one side of the main support plate and is arranged opposite to the left counterweight lifting block; the lateral locking cylinder is arranged on the other side of the main support plate, and its piston rod is arranged towards the left counterweight lifting block; the lateral loading cylinder is arranged on the left counterweight lifting block, and its piston rod is arranged towards the cylinder body of the lateral locking cylinder.

[0019] Compared with the prior art, the beneficial effects of the present utility model are as follows: The present utility model is reasonably designed and has a simple structure. By using the lever balance principle and setting the left counterweight lifting block and the right counterweight lifting block, the weight of the main shaft can be completely balanced. When loading is required, start the motor screw rod loading unit and the cylinder loading unit on the balance bracket, so that the main shaft descends under the action of gravity. The vertical position of the main shaft is controlled by the constraint guide rail. When it contacts the pressure sensor after descending and reaches the set force value, it stops, and the main shaft can stay at the designated position for operation. The present utility model does not need to rely on the dwell time to control the dimensional accuracy. The product can be measured by on-line interference and the tool displacement can be measured, and the product error can be automatically corrected. It can achieve micro-force control and effectively improve the machining accuracy of the product; the integration degree of the main shaft loading module is high, it can be well adapted to the existing equipment, it can reduce the investment in equipment upgrading and transformation of enterprises, and has a high cost performance. Description of the Drawings

[0020] Figure 1 It is a structural diagram of the main shaft loading module of the numerical control machine tool according to the embodiment of the present utility model;

[0021] Figure 2 It is another angle structural diagram of the main shaft loading module of the numerical control machine tool according to the embodiment of the present utility model;

[0022] Figure 3 It is a side view of the main shaft loading module of the numerical control machine tool according to the embodiment of the present utility model;

[0023] Figure 4 It is another side view of the main shaft loading module of the numerical control machine tool according to the embodiment of the present utility model;

[0024] Figure 5 It is a front view of the main shaft loading module of the numerical control machine tool according to the embodiment of the present utility model;

[0025] Figure 6Structural diagram of another embodiment of the spindle loading module of the numerical control machine tool according to the embodiment of the present utility model;

[0026] Figure 7 Schematic diagram of the installation effect of the spindle loading module of the numerical control machine tool according to the embodiment of the present utility model;

[0027] In Figures 1 to 7 among them, the corresponding relationship between the names of each component and the drawing reference numerals is as follows:

[0028] 1 - Slide table, 2 - Balance support, 3 - Left balance support block, 4 - Right balance support block, 5 - Left counterweight pull rod, 6 - Right counterweight pull rod, 7 - Right-side counterweight hanging block, 8 - Loading support, 9 - Motor lead screw loading unit, 901 - Driving motor, 902 - Lead screw slider mechanism, 903 - Moving loading block, 10 - Cylinder loading unit, 1001 - Loading cylinder, 1002 - Small counterweight block, 11 - Constraint guide rail, 12 - Left-side counterweight hanging block, 13 - Spindle, 14 - Pressure sensor, 15 - Rigid locking mechanism, 1601 - Suspension bracket, 1602 - Connecting bracket, 1603 - Limit rod, 1604 - Brake seat, 1605 - Brake arm, 1606 - Brake cylinder, 17 - Double swivel head mechanism, 18 - Horizontal micro-force floating loading component, 1801 - Horizontal slide rail component, 1802 - Main support plate, 1803 - Blocking block, 1804 - Lateral locking cylinder, 1805 - Lateral loading cylinder. Specific implementation manners

[0029] The following further describes in detail the implementation manners of the present utility model in conjunction with the drawings and embodiments. The attached drawings are only for reference and explanation purposes and are not used to limit the embodiments of the present disclosure. The following embodiments are used to illustrate the present utility model but cannot be used to limit the scope of the present utility model.

[0030] In the description of the present utility model, unless otherwise specified, "a plurality of" means two or more; the orientation or position relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientation or position relationships shown in the drawings, and are only for the convenience of describing the present utility model 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 thus cannot be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0031] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "connected" and "coupled" 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 directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0032] Please refer to Figures 1 to 7 , the present utility model provides a spindle loading module, which is installed on a numerically controlled machine tool and includes a sliding table 1. A balance bracket 2 is hinged on the sliding table 1, and the balance bracket 2 can swing left and right around the hinge point;

[0033] One end of the balance bracket 2 is provided with a left balance support block 3, and the other end is provided with a right balance support block 4. A left counterweight pull rod 5 is provided on the left balance support block 3, and a right counterweight pull rod 6 is provided on the right balance support block 4. A right-side counterweight hanging block 7 is arranged at the bottom end of the right counterweight pull rod; A loading assembly is arranged above the right side of the balance bracket 2. The loading assembly includes a loading bracket 8, a motor screw loading unit 9 and a cylinder loading unit 10 installed on the loading bracket 8;

[0034] The motor screw loading unit 9 includes a driving motor 901, a screw slider mechanism 902 and a moving loading block 903; The moving loading block 903 is slidably arranged on the loading bracket 8. The driving motor 901 is in transmission connection with the screw slider mechanism 902, and the screw slider mechanism 902 is in threaded connection with the moving loading block 903;

[0035] The cylinder loading unit 10 includes a pair of loading cylinders 1001. The loading cylinders 1001 are fixedly installed on the loading bracket 8, and a small counterweight block 1002 is arranged on the piston rod of the loading cylinders 1001.

[0036] A restraint guide rail 11 is arranged on the front surface of the sliding table 1. A left-side counterweight hanging block 12 is slidably arranged on the restraint guide rail 11. A spindle 13 is arranged on the left-side counterweight hanging block 12, and the left-side counterweight hanging block 12 is connected to the bottom end of the left counterweight pull rod 5; A pressure sensor 14 is arranged at the bottom of the sliding table 1, and the pressure sensor 14 is arranged in cooperation with the spindle 13.

[0037] In an embodiment of the present utility model, the spindle loading module adopts a lever balance structure, similar to the structure of a balance scale. The balance bracket 2 serves as the lever. One end suspends the left counterweight block 12 and the spindle 13 through the left balance support block 3 and the left counterweight pull rod 5, while the other end suspends the right counterweight block 7 through the right balance support block 4 and the right counterweight pull rod 6, thereby enabling both ends of the balance bracket 2 to reach a balanced state, and enabling the weight of the spindle 13 to be completely balanced.

[0038] When loading is required, that is, when the spindle 13 descends to the specified working position, the motor screw rod loading unit 9 and the cylinder loading unit 10 on the balance bracket 2 can be started at this time. The motor screw rod loading unit 9 and the cylinder loading unit 10 break the balance of the lever by changing their own center of gravity, thereby enabling the spindle 13 to descend under the action of gravity. At the same time, the movement of the spindle 13 in the vertical direction is controlled by the constraint guide rail 11. When the spindle 13 descends and touches the pressure sensor 14 and reaches the set force value, the motor screw rod loading unit 9 and the cylinder loading unit 10 are stopped, and the spindle 13 can stay at the specified position for operation. After the operation is completed, controlling the motor screw rod loading unit 9 and the cylinder loading unit 10 to move in the reverse direction can drive the spindle 13 back to the initial position.

[0039] In this embodiment, the pressure sensor 14 is mainly used for calibration and has different working states in different working links. When moving the small counterweight block 1002, the pressure sensor 14 generates a curve of force and displacement, and the displacement corresponding to the force is exactly the parameter that the numerical control system needs to control. When polishing or other processing is performed, the pressure sensor 14 is disengaged and does not monitor the force.

[0040] Furthermore, this embodiment is equipped with a tool magazine and can automatically change tools. The multi-station model can automatically perform tool setting simultaneously, and each time the tool is fixed at a specific length.

[0041] Through the above structural design, micro-force loading can be achieved, and the loading mechanism can absorb vibration. It also has the high precision and high reliability of a five-axis numerical control machine tool. By using an on-line measurement system, major breakthroughs such as the one-time clamping of all processes for aspherical mirror surface machining and mirror surface polishing in the optical industry can be realized. In addition, the use of a fixed abrasive polishing disc is realized in this embodiment. There is no need to add free abrasives to the polishing liquid, and only coolant is required to achieve mirror surface polishing, which greatly improves the machining accuracy and machining efficiency and improves the working environment.

[0042] Preferably, a rigid locking mechanism 15 is provided on the sliding table 1 and is adapted to cooperate with the main shaft 13. The rigid locking mechanism 15 is used to fix the main shaft 13 at a certain position on the constraint guide rail 11. In this embodiment, when milling and grinding operations are to be performed, the motor screw rod loading unit 9 and the cylinder loading unit 10 are started to drive the main shaft 13 to a designated position, and then the rigid locking mechanism 15 is started. The main shaft 13 is fixed on the sliding table 1 through the rigid locking mechanism 15, thereby realizing the arbitrary switching between constant flexible force loading and rigid machining.

[0043] Preferably, a hinge seat is provided on the top of the sliding table 1. The balance bracket 2 is of a rectangular frame structure. The balance bracket 2 is sleeved on the hinge seat, and its two side walls are respectively hinged to the hinge seat. Moreover, the hinge points of the balance bracket 2 are close to the right side of the balance bracket 2. Through the above structural design, the balance bracket 2 is supported in a hinged manner by the hinge seat on the sliding table 1, that is, the balance bracket 2 can swing left and right around the hinge points. The main shaft 13 and the left counterweight hanging block 12 are fixed on the constraint guide rail 11 and can move up and down. The left counterweight pull rod 5 suspends the left counterweight hanging block 12 and the main shaft 13 and is hung on the left support bottom plate in a hinged manner through the left connecting plate. The right counterweight hanging block 7 is suspended by the right counterweight pull rod 6 and is hung on the right support bottom plate in a hinged manner through the right connecting plate, thereby realizing the balance on both the left and right sides of the balance bracket 2.

[0044] Preferably, the small counterweight block 1002 is of a structure that can be quickly disassembled or a structure that can increase or decrease the counterweight size. The weight of the small counterweight block 1002 is calibrated by an electronic scale according to actual requirements, and the small counterweight block 1002 is selectively moved for loading according to the working conditions. For this purpose, the small counterweight block 1002 can be set as a structure that can be quickly disassembled or a structure that can increase or decrease the counterweight size so as to change different weights.

[0045] Preferably, the constraint guide rail 11 is any one of a roller linear guide rail, a cylindrical linear guide rail, or a ball linear guide rail. The constraint guide rail 11 can adopt various structural forms to reduce the friction force.

[0046] Preferably, a gravity loading and limiting mechanism cooperating with the main shaft 13 is further provided on the sliding table 1. The gravity loading and limiting mechanism includes a suspension bracket 1601, a connecting bracket 1602, a limiting rod 1603, a brake seat 1604, a brake arm 1605 and a brake cylinder 1606. The suspension bracket 1601 is connected to the sliding table 1. The bottom of the connecting bracket 1602 is connected to the main shaft 13, and the top is connected to the limiting rod 1603. The brake seat 1604 and the brake cylinder 1606 are respectively arranged on the suspension bracket 1601. The piston rod of the brake cylinder 1606 is connected to the brake seat 1604, and the limiting rod 1603 vertically penetrates the brake seat 1604. In this embodiment, the gravity loading and limiting mechanism can limit the main shaft 13 at any position within its effective stroke. In a multi-station five-axis machine, tool setting is required for multiple stations simultaneously. The gravity loading and limiting mechanism can make the lengths of all the tool holders at multiple stations the same, that is, the end faces of the tools are in the same plane.

[0047] Preferably, the main shaft loading module is installed on the Z-axis of a numerical control machine tool, and the numerical control machine tool is a three-axis machine, a four-axis machine, a five-axis machine, a large gantry milling machine, a six-axis manipulator or a non-standard device.

[0048] Preferably, the sliding table 1 is a cuboid hollow structure, and its side walls are provided with a plurality of weight-reducing holes. By providing the weight-reducing holes, the weight of the sliding table 1 can be reduced while ensuring the structural strength of the sliding table 1, so as to improve the stability of the entire main shaft loading module when moving on the Z-axis.

[0049] Preferably, the main shaft 13 and the left counterweight hanging block 12 are connected by a double swivel head mechanism 17. In this embodiment, please refer to Figure 6 , by installing the main shaft 13 on the double swivel head mechanism 17 and then installing the double swivel head mechanism 17 at the bottom of the left counterweight hanging block 12, the flexibility of the main shaft 13 can be increased in this way.

[0050] Preferably, it also includes a horizontal micro-force floating loading component 18; the horizontal micro-force floating loading component 18 includes a horizontal slide rail component 1801, a main support plate 1802, a blocking block 1803, a transverse locking cylinder 1804 and a transverse loading cylinder 1805; the main support plate 1802 and the left counterweight hanging block 12 are slidably connected through the horizontal slide rail component 1801; the horizontal slide rail component 1801 includes a transverse guide rail and a transverse slider, the transverse guide rail is arranged at the bottom of the left counterweight hanging block 12, and the transverse slider is slidably arranged On the transverse guide rail, the main support plate 1802 is connected to the transverse slider; the main shaft 13 is arranged at the bottom of the main support plate 1802; the blocking block 1803 is arranged on one side of the main support plate 1802, and is arranged opposite to the left counterweight hanger block 12; the transverse locking cylinder 1804 is arranged on the other side of the main support plate 1802, and its piston rod is arranged toward the left counterweight hanger block 12; the transverse loading cylinder 1805 is arranged on the left counterweight hanger block 12, and its piston rod is arranged toward the cylinder body of the transverse locking cylinder 1804.

[0051] For the working conditions that some products need inner holes and sides to be polished, only Z-axis floating loading cannot meet the requirements. For this reason, the spindle loading module of this embodiment adds a horizontal micro-force floating loading function. Specifically, the lower end face of the left counterweight hanging block 12 is fixed with a transverse guide rail, the main support plate 1802 is fixed on the transverse slide, and the main shaft 13 is fixed on the main support plate 1802. The main support plate 1802 is equipped with a blocking block 1803, which is blocked by the left counterweight hanging block 12. The main support plate 1802 is equipped with a transverse locking cylinder 1804. When the piston rod of the transverse locking cylinder 1804 extends out and supports the left counterweight hanging block 12, under the action of the blocking block 1803, when the horizontal micro-force floating loading is not required, the main shaft 13 is in a locked state. When micro-force floating loading is required, the piston rod of the transverse locking cylinder 1804 retreats and does not contact the left counterweight hanging block 12. At this time, the transverse loading cylinder 1805 fixed on the left counterweight block 12 works, and its piston rod extends to support the transverse locking cylinder 1804 and the main support plate 1802. Under the action of the blocking block 1803, the spindle 13 is in a limited state. During operation, when the tool of the spindle 13 touches the workpiece, the transverse loading cylinder 1805 may retract, and under the action of air pressure, a constant loading force is still maintained, thereby realizing micro-force floating loading in the horizontal direction.

[0052] Compared with the prior art, the beneficial effects of the utility model are as follows: The utility model is reasonably designed and has a simple structure. By using the lever balance principle and setting the left counterweight hanging block and the right counterweight hanging block, the weight of the main shaft can be completely balanced. When loading is required, start the motor screw rod loading unit and the cylinder loading unit on the balance bracket, so that the main shaft descends under the action of gravity. The vertical position of the main shaft is controlled by the constraint guide rail. When it descends and contacts the pressure sensor, it stops after reaching the set force value, and the main shaft can stay at the designated position for operation. The utility model does not need to rely on the dwell time to control the dimensional accuracy. The product can be measured by on-line interference and tool displacement measurement and automatically correct the product error, can realize micro-force control, and effectively improve the product processing accuracy; the integration degree of the main shaft loading module is high, can be well adapted to the existing equipment, can reduce the investment in enterprise equipment upgrading and transformation, and has a high cost performance.

[0053] The embodiments of the present utility model are given for the purposes of illustration and description, and are not exhaustive or limit the present utility model to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are chosen and described in order to better explain the principles and practical applications of the present utility model, and to enable those of ordinary skill in the art to understand the present utility model so as to design various embodiments with various modifications suitable for specific purposes.

Claims

1. A spindle loading module is installed on a numerically controlled machine tool, and is characterized in that, It comprises a slide (1), on which a balancing bracket (2) is connected, and the balancing bracket can swing left and right around a hinge point; A left balancing support block (3) is provided at one end of the balancing support, and a right balancing support block (4) is provided at the other end; a left counterweight pull rod (5) is provided on the left balancing support block, a right counterweight pull rod (6) is provided on the right balancing support block, and a right counterweight hanging block (7) is provided at the bottom end of the right counterweight pull rod; a loading assembly is provided on the upper right side of the balancing support, and the loading assembly includes a loading bracket (8), and a motor screw loading unit (9) and a cylinder loading unit (10) installed on the loading bracket; The motor screw loading unit comprises a driving motor (901), a screw slider mechanism (902) and a movable loading block (903); the movable loading block is slidably arranged on the loading bracket, the driving motor is drivingly connected to the screw slider mechanism, and the screw slider mechanism is threadedly connected to the movable loading block; The cylinder loading unit comprises a pair of loading cylinders (1001), the loading cylinders are fixedly mounted on the loading bracket, and a small counterweight (1002) is provided on the piston rod of the loading cylinder; A constraint guide rail (11) is provided on the front of the slide, a left counterweight block (12) is slidably provided on the constraint guide rail, a main shaft (13) is provided on the left counterweight block, and the left counterweight block is connected to the bottom end of the left counterweight pull rod; a pressure sensor (14) is provided at the bottom of the slide, and the pressure sensor is arranged in coordination with the main shaft.

2. The spindle loading module according to claim 1, wherein The slide table is provided with a rigid locking mechanism (15) matched with the main shaft, and the rigid locking mechanism is used to fix the main shaft at a certain position on the constraint guide rail.

3. The spindle loading module according to claim 1, wherein A hinge seat is provided on the top of the slide, and the balancing bracket is a rectangular frame structure. The balancing bracket is sleeved on the hinge seat, and its two side walls are respectively hingedly connected to the hinge seat, and the hinge point of the balancing bracket is close to the right side of the balancing bracket.

4. The spindle loading module according to claim 1, wherein, The small counterweight block is a structure that can be quickly disassembled or a structure that can increase or decrease the size of the counterweight.

5. The spindle loading module according to claim 1, characterized in that The constraint guide rail is any one of a roller linear guide rail, a cylindrical linear guide rail or a ball linear guide rail.

6. The spindle loading module according to claim 1, wherein, The slide is also provided with a gravity loading limit mechanism matched with the main shaft, and the gravity loading limit mechanism includes a suspension frame (1601), a connecting frame (1602), a limit rod (1603), a brake seat (1604), a brake arm (1605) and a brake cylinder (1606); the suspension frame is connected to the slide, the bottom of the connecting frame is connected to the main shaft, and the top is connected to the limit rod; the brake seat and the brake cylinder are respectively arranged on the suspension frame, the piston rod of the brake cylinder is connected to the brake seat, and the limit rod vertically penetrates the brake seat.

7. The spindle loading module according to claim 1, wherein The spindle loading module is installed on the Z axis of a CNC machine tool, and the CNC machine tool is a three-axis machine, a four-axis machine, a five-axis machine, a large gantry milling machine, a six-axis manipulator or a non-standard device.

8. The spindle loading module according to claim 1, wherein, The slide is a rectangular hollow structure, and a plurality of weight-reducing holes are arranged on its side wall.

9. The spindle loading module according to claim 1, wherein The main shaft is connected to the left counterweight hanging block through a double swing head mechanism (17).

10. The spindle loading module according to any one of claims 1 to 9, characterized in that, It further includes a horizontal micro-force floating loading assembly (18); the horizontal micro-force floating loading assembly includes a horizontal slide rail assembly (1801), a main support plate (1802), a stop block (1803), a lateral locking cylinder (1804) and a lateral loading cylinder (1805); the main support plate is slidably connected to the left counterweight hanging block through the horizontal slide rail assembly; the horizontal slide rail assembly includes a lateral guide rail and a lateral slider, the lateral guide rail is arranged at the bottom of the left counterweight hanging block, the lateral slider is slidably arranged on the lateral guide rail, and the main support plate is connected to the lateral slider; the main shaft is arranged at the bottom of the main support plate; the stop block is arranged on one side of the main support plate and is oppositely arranged with the left counterweight hanging block; the lateral locking cylinder is arranged on the other side of the main support plate, and its piston rod is arranged towards the left counterweight hanging block; the lateral loading cylinder is arranged on the left counterweight hanging block, and its piston rod is arranged towards the cylinder body of the lateral locking cylinder.

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