Axial flexible floating device

Abstract

The utility model relates to the technical field of mechanical equipment, in particular to an axial flexible floating device which comprises a main shaft body, a mounting seat, a fixing seat and a flexible floating unit. The main shaft body is fixedly arranged on the top wall of the mounting base, the fixing base extends into the mounting cavity, and the bottom wall of the fixing base is located below the mounting base; the flexible floating unit is fixedly arranged between the mounting seat and the fixed seat; the main shaft body and the mounting seat can slide on the fixed seat through the sliding plate; the arranged axial flexible floating device, the first piston assembly and the second piston assembly jointly abut against the fixing base, so that the position between the fixing base and the mounting base is fixed, the position of the main shaft body is fixed, and when the grinding head is subjected to rigid impact, the first piston assembly or the second piston assembly shrinks; therefore, part of rigid impact on the main shaft body is counteracted, damage to a workpiece or the grinding head caused by the rigid impact is avoided, and the service life of the grinding head is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of mechanical equipment, and in particular to an axially flexible floating device. Background Art

[0002] In the production process of mechanical parts, products with complex shapes are usually formed by casting. After the workpiece is cast, burrs often appear on the surface of the workpiece at the joints of the mold. These burrs often affect the assembly and normal use of the workpiece and cause damage to equipment and instruments. Therefore, the burrs on the surface of the parts need to be polished.

[0003] In the existing burr removal process, a grinding head is usually fixedly installed at the output end of the spindle, and the spindle is fixed on an external mounting frame. The spindle can be placed horizontally or vertically. The spindle drives the grinding head to rotate at high speed. The robotic arm clamps the workpiece and approaches the grinding head. The grinding head contacts the burrs on the workpiece. The robotic arm slowly moves the workpiece, so that the contact position between the grinding head and the workpiece constantly changes to adapt to the surface shape of the workpiece. The grinding head removes burrs on the workpiece while rotating at high speed.

[0004] When the workpiece is close to the grinding head, it is easy to cause a large impact force on the grinding head. The rigid impact causes damage to the workpiece or the grinding head, thereby affecting the service life of the grinding head. Utility Model Content

[0005] In order to increase the service life of the grinding head, the present application provides an axially flexible floating device.

[0006] The present application provides an axially flexible floating device that adopts the following technical solution:

[0007] An axially flexible floating device comprises a mounting seat, a fixing seat and a flexible floating unit, wherein a mounting cavity is formed at the bottom of the mounting seat, and the flexible floating unit is fixedly disposed in the mounting cavity;

[0008] The flexible floating unit includes a first piston assembly and a second piston assembly, which are symmetrically arranged at both ends of the length direction of the installation cavity; a connecting pipe is provided between the first piston assembly and the second piston assembly;

[0009] A sliding plate is provided between the first piston assembly and the second piston assembly, and the fixing seat is slidably connected to the sliding plate;

[0010] The top wall of the mounting seat is fixedly provided with a main shaft body.

[0011] By adopting the above technical solution, when it is necessary to remove burrs from a workpiece, a grinding head is installed at the output end of the spindle body, and the spindle body is started at the same time, so that the spindle body drives the grinding head to rotate at high speed; the robotic arm clamps the workpiece and approaches the grinding head, and the grinding head contacts the burrs on the workpiece. The robotic arm slowly moves the workpiece, so that the contact position between the grinding head and the workpiece changes continuously. The grinding head removes burrs on the workpiece while rotating at high speed. The first piston assembly and the second piston assembly maintain the same internal pressure through the connecting pipe. When the spindle body is placed horizontally, the workpiece contacts the grinding head and generates an impact, which pushes the spindle to move in a direction away from the workpiece. The spindle drives the mounting seat to move, and the mounting seat drives the first piston assembly and the second piston assembly to move. When the axially flexible floating device is placed horizontally, the first piston assembly or the second piston assembly generates pressure on the fixing seat, causing the first piston assembly or the second piston assembly to contract to offset part of the rigid impact on the spindle body, thereby avoiding damage to the workpiece or the grinding head caused by the rigid impact when the grinding head contacts the workpiece, thereby increasing the service life of the grinding head.

[0012] In a specific possible implementation scheme, the first piston assembly includes a first piston cylinder and a first piston rod, the first piston cylinder is fixedly arranged at one end in the length direction of the mounting cavity, and multiple first piston rods are arranged in parallel in the first piston cylinder, the first piston rod is parallel to the length direction of the mounting seat along the axial direction, one end of the first piston rod is slidingly connected to the first piston cylinder, and the other end is abutted against the fixed seat, and the first piston rod is in a fully extended state; the first piston cylinder is provided with a first air valve.

[0013] By adopting the above technical solution, a first piston assembly is set up, and multiple first piston rods fully extend out of the first piston cylinder and jointly abut the fixed seat; when the axial flexible floating device is placed vertically and the first piston assembly is located above the second piston assembly, the multiple first piston rods generate downward pressure on the fixed seat, thereby supporting the fixed seat to achieve position fixation between the fixed seat and the mounting seat; when the axial flexible floating device is placed vertically and the first piston assembly is located below the second piston assembly, during the process of grinding the workpiece, after the grinding head is subjected to a rigid impact, the grinding head drives the spindle body to move, the spindle body drives the mounting seat to move, and the mounting seat drives the second piston assembly and the first piston assembly to move, and the first piston rod applies pressure to the mounting seat, causing the first piston rod to contract into the first piston cylinder; when the impact is too large, the first air valve replenishes air pressure into the first piston assembly, so that the first piston rod offsets part of the rigid impact on the grinding head, thereby avoiding damage to the workpiece or the grinding head caused by the rigid impact when the grinding head contacts the workpiece, thereby improving the service life of the grinding head.

[0014] In a specific possible implementation scheme, the first piston assembly includes a first piston cylinder and a first piston rod, the first piston cylinder is fixedly arranged at one end in the length direction of the mounting cavity, and multiple first piston rods are arranged in parallel in the first piston cylinder, the first piston rod is parallel to the length direction of the mounting seat along the axial direction, one end of the first piston rod is slidingly connected to the first piston cylinder, and the other end is abutted against the fixed seat, and the first piston rod is in a fully extended state; the first piston cylinder is provided with a first air valve.

[0015] By adopting the above technical solution, a second piston assembly is set, and multiple second piston rods are fully extended from the second piston cylinder body and jointly abut the fixed seat; when the axial flexible floating device is placed vertically and the second piston assembly is located above the first piston assembly, the multiple second piston rods generate downward pressure on the fixed seat, thereby supporting the fixed seat to achieve position fixation between the fixed seat and the mounting seat; when the axial flexible floating device is placed vertically and the second piston assembly is located below the first piston assembly, during the process of grinding the workpiece, after the grinding head is subjected to a rigid impact, the grinding head drives the spindle body to move, the spindle body drives the mounting seat to move, the mounting seat drives the second piston assembly and the first piston assembly to move, the second piston rod applies pressure to the mounting seat, so that the second piston rod contracts into the second piston cylinder body, and when the impact is too large, the second air valve replenishes air pressure into the second piston assembly, so that the second piston rod offsets part of the rigid impact on the grinding head, so as to avoid damage to the workpiece or the grinding head caused by the rigid impact when the grinding head contacts the workpiece, thereby improving the service life of the grinding head.

[0016] In a specific possible implementation scheme, the sliding plate is fixedly disposed between the first piston cylinder and the second piston cylinder, the mounting seat is engaged with the sliding plate, and the mounting seat can slide along the length direction of the sliding plate.

[0017] By adopting the above technical solution, when the mounting seat slides in the length direction of the sliding plate, it generates pressure with the first piston rod or the second piston rod, which facilitates the contraction of the first piston rod or the second piston rod, thereby avoiding the mounting seat from generating a rigid impact on the fixed seat, and achieving the offsetting of the impact force on the main shaft body.

[0018] In a specific possible implementation scheme, the fixing seat includes a base plate, a connecting plate, and a limit plate; the bottom wall of the base plate extends out of the bottom of the mounting cavity, and the bottom wall of the base plate is fixedly connected to an external mounting bracket; the first piston cylinder and the second piston cylinder are located above the base plate; a sliding gap is provided between the base plate and the inner walls at both ends of the mounting cavity in the longitudinal direction, and the sliding gap is used to achieve relative sliding of the fixing seat in the mounting cavity;

[0019] The connecting plate is fixedly mounted on the top wall of the bottom plate, and two abutment blocks are fixedly mounted on opposite sides of the connecting plate, and the two abutment blocks abut against the end of the first piston rod and the end of the second piston rod respectively;

[0020] The limiting plate is fixedly arranged on the top wall of the connecting plate. A guide groove is formed on the limiting plate. The sliding plate is engaged in the guide groove, and the sliding plate can slide along the guide groove.

[0021] By adopting the above technical scheme, a fixed seat is set, and the base plate is fixedly connected to the external mounting frame, so that the fixed seat can support the flexible floating unit, thereby realizing the installation and fixation of the mounting seat and the main shaft body; the two abutment blocks are installed and fixed by the connecting plate, and at the same time, it is convenient for the first piston rod and the second piston rod to abut the mounting seat; the guide groove provided on the sliding plate is convenient for limiting the movement direction of the mounting seat, so that the mounting seat slides along the length direction of the guide groove, thereby realizing the reduction of the rigid impact on the grinding head and the main shaft body. At the same time, the sliding plate is engaged in the guide groove, so that the mounting seat and the fixed seat produce relative movement along the length direction of the sliding plate, which is convenient for avoiding dislocation of the mounting seat when the grinding head is subjected to rigid impact, thereby improving the stability of the axial flexible floating device.

[0022] In a specific possible implementation scheme, limiting grooves are provided on both sides of the sliding plate in the length direction, and limiting bosses are integrally provided on both side walls of the guide groove in the length direction, and the limiting bosses are engaged in the limiting grooves.

[0023] By adopting the above technical solution, the limit groove and the limit boss are set, and the limit boss is engaged in the limit groove, which prevents the sliding plate from falling off from the guide groove when the axial flexible floating device is placed vertically, thereby improving the installation stability of the mounting seat and the main shaft body.

[0024] In a specific embodiment, the first air valve is connected to the first piston cylinder, and the second air valve is connected to the second piston cylinder;

[0025] The first air valve and the second air valve are both connected to an external air pressure regulating device.

[0026] By adopting the above technical solution, the external air pressure regulating device inputs air pressure to the first piston cylinder through the first air valve, so as to ensure that the internal pressures of the multiple first piston rods are the same, thereby realizing stable support of the multiple first piston rods to the fixed seat; the external air pressure regulating device inputs air pressure to the second piston cylinder through the second air valve, so as to ensure that the internal pressures of the multiple second piston rods are the same, thereby realizing stable support of the multiple second piston rods to the fixed seat.

[0027] In a specific embodiment, one end of the connecting pipe is connected to the first piston cylinder, and the other end is connected to the second piston cylinder.

[0028] By adopting the above technical solution, the two ends of the connecting pipe are connected to the first piston cylinder and the second piston cylinder, which makes it easy to ensure that the air pressure inside the first piston assembly and the second piston assembly is the same, so that the first piston rod and the second piston rod are subjected to the same internal pressure, thereby making it easy to ensure that the fixing seat is in the middle position of the installation cavity along the length direction.

[0029] In summary, this application includes at least one of the following beneficial technical effects:

[0030] 1. The axial flexible floating device is set. When the workpiece needs to be deburred, the workpiece contacts the grinding head and generates an impact, which pushes the main shaft to move away from the workpiece. The main shaft drives the mounting seat to move, and the mounting seat drives the first piston assembly and the second piston assembly to move. The first piston assembly or the second piston assembly contracts to offset part of the rigid impact on the main shaft body, so as to avoid damage to the workpiece or the grinding head caused by the rigid impact, thereby increasing the service life of the grinding head. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of an axially flexible floating device in an embodiment.

[0032] Figure 2 It is a cross-sectional view of an axially flexible floating device according to an embodiment.

[0033] Figure 3 The figure is a schematic diagram of the floating unit structure of an axially flexible floating device in an embodiment.

[0034] Figure 4 It is a schematic diagram of the structure of a fixing seat of an axially flexible floating device in an embodiment.

[0035] Figure 5 It is a schematic diagram of a limit plate and a sliding plate of an axially flexible floating device in an embodiment.

[0036] Description of the drawings: 1. Mounting seat; 11. Mounting cavity; 111. Sliding gap; 2. Fixed seat; 21. Base plate; 22. Connecting plate; 23. Limiting plate; 231. Guide groove; 2311. Limiting boss; 24. Abutment block; 3. Flexible floating unit; 31. First piston assembly; 311. First piston cylinder; 312. First piston rod; 313. First air valve; 32. Second piston assembly; 321. Second piston cylinder; 322. Second piston rod; 323. Second air valve; 33. Connecting pipe; 34. Sliding plate; 341. Limiting groove; 4. Spindle body. DETAILED DESCRIPTION

[0037] The following is combined with Figure 1-5 This application is described in further detail.

[0038] The embodiment of the present application discloses an axially flexible floating device.

[0039] Reference Figure 1 and Figure 2 An axially flexible floating device includes a main shaft body 4, a mounting seat 1 and a fixed seat 2, and a mounting cavity 11 is provided at the bottom of the mounting seat 1, the top of the fixed seat 2 extends into the mounting cavity 11, and a sliding gap 111 is formed between the fixed seat 2 and the two side walls of the mounting cavity 11 in the length direction for the mounting seat 1 to slide; the main shaft body 4 is fixedly arranged on the top wall of the mounting seat 1, and the central axis of the main shaft body 4 is parallel to the plane where the top wall of the mounting seat 1 is located.

[0040] Reference Figure 2-Figure 4, a flexible floating unit 3 is provided in the mounting chamber 11, and the flexible floating unit 3 includes a first piston assembly 31, a second piston assembly 32, a connecting pipe 33 and a sliding plate 34; the first piston assembly 31 is fixedly arranged on one side of the mounting chamber 11 close to the output end of the main shaft body 4, and the second piston assembly 32 is located at the other end of the mounting chamber 11, and the first piston assembly 31 and the second piston assembly 32 are symmetrically arranged with respect to the length direction of the mounting chamber 11; the first piston assembly 31 includes a first air valve 313, a first piston cylinder 311 and a plurality of first piston rods 312; the first piston cylinder 311 and the mounting chamber 11 close to the main shaft body 4 The side wall of the shaft body 4 is fixedly connected, and multiple first piston rods 312 are arranged in the first piston cylinder 311. The first piston rod 312 is parallel to the length direction of the mounting cavity 11 along the axial direction, and multiple first piston rods 312 are located in the same horizontal plane. One end of the first piston rod 312 is slidingly connected to the first piston cylinder 311, and the other end abuts against the side wall of the fixed seat 2. The first piston rod 312 is in a fully extended state; the first air valve 313 passes through the side wall of the mounting seat 1 close to the first piston cylinder 311, and one end of the first air valve 313 is connected to the first piston cylinder 311, and the other end is connected to the external air pressure regulating device. The second piston assembly 32 includes a second air valve 323, a second piston cylinder 321 and multiple second piston rods 322; the second piston cylinder 321 is fixedly connected to the side wall of the mounting chamber 11 away from the first piston cylinder 311, and multiple second piston rods 322 are arranged in the second piston cylinder 321. The second piston rod 322 is parallel to the length direction of the mounting chamber 11 along the axial direction, and the multiple second piston rods 322 are located in the same horizontal plane. One end of the second piston rod 322 is slidingly connected to the second piston cylinder 321, and the other end abuts against the side wall of the fixing seat 2 away from the first piston rod 312, and the second piston rod 322 is in a fully extended state; the second air valve 323 passes through the side wall of the mounting seat 1 close to the second piston cylinder 321, and one end of the second air valve 323 is connected to the second piston cylinder 321, and the other end is connected to the external air pressure regulating device. A connecting tube 33 is disposed between the first piston assembly 31 and the second piston assembly 32, with both ends of the connecting tube 33 respectively communicating with the first piston cylinder 311 and the second piston cylinder 321. The same number of first piston rods 312 and second piston rods 322 is provided to ensure equal force on both sides of the fixing base 2. The number of first piston rods 312 can be two, three, or four, as long as it can provide stable support for the fixing base 2. In this embodiment, four first piston rods 312 are provided.The sliding plate 34 is arranged between the first piston cylinder 311 and the second piston cylinder 321. The two ends of the sliding plate 34 are fixedly connected to the two side walls of the first piston cylinder 311 and the second piston cylinder 321 that are close to each other. In this embodiment, two sliding plates 34 are provided, and the two sliding plates 34 are located in the same plane. The plane where the side walls of the sliding plate 34 along the length direction are located is parallel to the length direction of the installation cavity 11. The two sliding plates 34 are both located above the first piston rod 312 and the second piston rod 322.

[0041] Reference Figure 3 and Figure 4 The fixing seat 2 includes a bottom plate 21, a connecting plate 22, two abutting blocks 24 and a limiting plate 23; the top wall of the bottom plate 21 is arranged in the mounting cavity 11, the first piston cylinder body 311 and the second piston cylinder body 321 are located above both sides in the length direction of the bottom plate 21, the bottom wall of the bottom plate 21 extends out of the bottom of the mounting seat 1, and the bottom plate 21 is fixedly arranged on the external mounting frame; the connecting plate 22 is fixedly arranged on the top wall of the bottom plate 21, the two abutting blocks 24 are fixedly arranged on the opposite side walls of the connecting plate 22, and the two abutting blocks 24 respectively abut the ends of the first piston rod 312 and the second piston rod 322, the limiting plate 23 is fixedly arranged on the top wall of the connecting plate 22, and the number of the limiting plates 23 is the same as the number of the sliding plates 34, the two limiting plates 23 are arranged in parallel, and a guide groove 231 is opened on the limiting plate 23, the extension direction of the guide groove 231 is parallel to the length direction of the mounting seat 1, and the sliding plate 34 is engaged in the guide groove 231.

[0042] Reference Figure 4 and Figure 5 The sliding plate 34 is provided with limiting grooves 341 on both sides in the length direction, and the two side walls of the guide groove 231 in the length direction are integrally provided with limiting bosses 2311 , which are engaged in the limiting grooves 341 .

[0043] The implementation principle of the axial flexible floating device of the present application is: when it is necessary to remove burrs from the workpiece, the grinding head is installed on the output end of the spindle body 4, the spindle body 4 is started, and the spindle body 4 drives the grinding head to rotate at high speed. The robotic arm clamps the workpiece and approaches the grinding head. The grinding head contacts the burrs on the workpiece, and the robotic arm slowly moves the workpiece so that the contact position between the grinding head and the workpiece changes continuously. The grinding head removes the burrs on the workpiece when rotating at high speed.

[0044] When the spindle body 4 is placed horizontally, the external air pressure regulating device inputs appropriate pressure to the first piston assembly 31 and the second piston assembly 32 through the first air valve 313 and the second air valve 323, and the first piston cylinder 311 and the second piston cylinder 321 are connected through the connecting pipe 33, so that the first piston rod 312 and the second piston rod 322 are subjected to the same internal pressure, and the first piston rod 312 and the second piston rod 322 are in a fully extended state. The first piston rod 312 and the second piston rod 322 abut against the abutment blocks 24 on both sides of the connecting plate 22, ensuring that the fixing seat 2 is in the middle position in the length direction of the mounting cavity 11; when the workpiece contacts the grinding head, the workpiece impacts the grinding head, pushing the spindle body 4 to move away from the workpiece, and the spindle body 4 drives the mounting seat 1 and the flexible floating unit When the first and second piston cylinders 311 and 321 move together, the sliding plate 34 between the first piston cylinder 311 and the second piston cylinder 321 slides horizontally in the guide groove 231 formed on the limit plate 23 in the direction away from the workpiece. At this time, the first piston assembly 31 generates a thrust on the abutment block 24. Under the action of the fixing seat 2, the first piston assembly 31 is subjected to a reverse thrust by the fixing seat 2, and the first piston rod 312 contracts into the first piston cylinder 311 to offset the rigid impact exerted on the spindle body 4. When the first piston rod 312 is subjected to a greater force, the first piston rod 312 contracts more greatly. At this time, the external air pressure regulating device replenishes air pressure to the first air valve 313, thereby increasing the internal pressure exerted on the first piston rod 312 and reducing the contraction of the first piston rod 312, thereby ensuring that the movement distance of the spindle body 4 is reduced and the workpiece is polished evenly.

[0045] When the spindle body 4 is placed vertically and the first piston assembly 31 is located below the second piston assembly 32, in the initial state, the external air pressure regulating device inputs appropriate pressure to the first piston assembly 31 and the second piston assembly 32 through the first air valve 313 and the second air valve 323, so that the first piston rod 312 and the second piston rod 322 are fully extended, and the connecting pipe 33 makes the first piston rod 312 and the second piston rod 322 subjected to the same internal pressure, and the abutment blocks 24 on both sides of the connecting plate 22 abut against the first piston rod 312 and the second piston rod 322 respectively, and the second piston rod 322 overcomes the self-weight of the mounting seat 1, the flexible floating unit 3 and the spindle body 4, and generates downward pressure on the abutment block 24, so that the fixing seat 2 supports the mounting seat 1, the flexible floating unit 3 and the spindle body 4, and the fixing seat 2 is located in the middle position of the length direction in the mounting cavity 11; when the grinding head contacts the workpiece, when the impact force is small When the weight of the mounting seat 1, the flexible floating unit 3 and the main shaft body 4 is insufficient, the main shaft body 4 remains in its original position; when the impact force is greater than the weight of the mounting seat 1, the flexible floating unit 3 and the main shaft body 4, the impact force pushes the main shaft body 4 to move upward, and the main shaft body 4 drives the mounting seat 1 and the flexible floating unit 3 to move upward, and the sliding plate 34 between the first piston cylinder 311 and the second piston cylinder 321 slides upward in the guide groove 231 opened on the limit plate 23. At this time, the first piston rod 312 generates pressure on the abutment block 24, causing the first piston rod 312 to contract into the first piston cylinder 311. When the first piston rod 312 contracts to a large extent, the external air pressure regulating device supplements pressure to the first piston cylinder 311 through the first air valve 313, so that the internal pressure on the first piston rod 312 increases to reduce the contraction of the first piston rod 312 and ensure that the grinding head grinds the workpiece evenly.

[0046] When the main shaft body 4 is placed vertically and the second piston assembly 32 is located below the first piston assembly 31, in the initial state, the external air pressure regulating device inputs appropriate pressure to the first piston assembly 31 and the second piston assembly 32 through the first air valve 313 and the second air valve 323, so that the first piston rod 312 and the second piston rod 322 are fully extended, and the connecting pipe 33 makes the first piston rod 312 and the second piston rod 322 subjected to the same internal pressure, and the abutment blocks 24 on both sides of the connecting plate 22 abut against the first piston rod 312 and the second piston rod 322 respectively, and the first piston rod 312 overcomes the self-weight of the mounting seat 1, the flexible floating unit 3 and the main shaft body 4, and generates downward pressure on the abutment block 24, so that the fixing seat 2 supports the mounting seat 1, the flexible floating unit 3 and the main shaft body 4, and The fixing seat 2 is located in the middle position in the length direction of the mounting cavity 11; when the grinding head contacts the workpiece, the impact force generates downward pressure on the spindle body 4, causing the spindle body 4 to drive the mounting seat 1 and the flexible floating unit 3 to move downward, and the sliding plate 34 between the first piston cylinder 311 and the second piston cylinder 321 slides downward in the guide groove 231 opened on the limit plate 23. At this time, the first piston rod 312 generates pressure on the abutment block 24, causing the first piston rod 312 to contract into the first piston cylinder 311. When the contraction amount of the first piston rod 312 is large, the external air pressure regulating device supplements the pressure to the first piston cylinder 311 through the first air valve 313, so that the internal pressure of the first piston rod 312 increases to reduce the contraction amount of the first piston rod 312 and ensure that the grinding head grinds the workpiece evenly.

[0047] In particular, when the first piston rod 312 and the second piston rod 322 are in a fully extended state and a gap is generated between the abutment block and the first piston rod 312 or the second piston rod 322, a gasket can be added between the abutment block 24 and the connecting plate 22, or abutment blocks 24 of different widths can be replaced to ensure that in the initial state, the first piston rod 312 and the second piston rod 322 respectively abut against the abutment blocks 24 on both sides of the connecting plate 22, so as to ensure that the moving distance of the spindle body 4 is reduced when it is impacted, so as to improve the grinding accuracy of the workpiece.

[0048] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. An axially flexible floating device, characterized in that: It comprises a mounting seat (1), a fixing seat (2) and a flexible floating unit (3); a mounting cavity (11) is provided at the bottom of the mounting seat (1); and the flexible floating unit (3) is fixedly arranged in the mounting cavity (11); The flexible floating unit (3) comprises a first piston assembly (31) and a second piston assembly (32), wherein the first piston assembly (31) and the second piston assembly (32) are symmetrically arranged at both ends of the length direction of the installation cavity (11); a connecting pipe (33) is provided between the first piston assembly (31) and the second piston assembly (32); A sliding plate (34) is provided between the first piston assembly (31) and the second piston assembly (32), and the fixed seat (2) is slidably connected to the sliding plate (34); A main shaft body (4) is fixedly provided on the top wall of the mounting seat (1).

2. The axially flexible floating device according to claim 1, characterized in that: The first piston assembly (31) includes a first piston cylinder (311) and a first piston rod (312). The first piston cylinder (311) is fixedly arranged at one end of the length direction of the mounting cavity (11). A plurality of first piston rods (312) are arranged in parallel in the first piston cylinder (311). The first piston rod (312) is parallel to the length direction of the mounting seat (1) along the axial direction. One end of the first piston rod (312) is slidingly connected to the first piston cylinder (311), and the other end is in contact with the fixed seat (2). The first piston rod (312) is in a fully extended state. A first air valve (313) is provided on the first piston cylinder (311).

3. The axially flexible floating device according to claim 2, characterized in that: The second piston assembly (32) includes a second piston cylinder (321) and a second piston rod (322). The second piston cylinder (321) is fixedly arranged in the installation cavity (11), and the second piston cylinder (321) and the first piston cylinder (311) are symmetrically arranged with respect to the length direction of the installation cavity (11). A plurality of second piston rods (322) are arranged in parallel in the second piston cylinder (321). The second piston rod (322) is parallel to the length direction of the installation seat (1) along the axial direction. One end of the second piston rod (322) is slidably connected to the second piston cylinder (321), and the other end is in contact with the fixed seat (2). The second piston rod (322) is in a fully extended state. A second air valve (323) is provided on the second piston cylinder (321).

4. The axially flexible floating device according to claim 3, characterized in that: The sliding plate (34) is fixedly arranged between the first piston cylinder (311) and the second piston cylinder (321), the mounting seat (1) is engaged with the sliding plate (34), and the mounting seat (1) can slide along the length direction of the sliding plate (34).

5. The axially flexible floating device according to claim 4, characterized in that: The fixing seat (2) comprises a bottom plate (21), a connecting plate (22) and a limiting plate (23); the bottom wall of the bottom plate (21) extends out of the bottom of the installation cavity (11), and the bottom wall of the bottom plate (21) is fixedly connected to an external mounting frame; the first piston cylinder (311) and the second piston cylinder (321) are located above the bottom plate (21); a sliding gap (111) is provided between the bottom plate (21) and the inner walls at both ends of the length direction of the installation cavity (11), and the sliding gap (111) is used to achieve relative sliding of the fixing seat (2) in the installation cavity (11); The connecting plate (22) is fixedly arranged on the top wall of the bottom plate (21), and two abutment blocks (24) are fixedly installed on opposite sides of the connecting plate (22), and the two abutment blocks (24) abut against the end of the first piston rod (312) and the end of the second piston rod (322) respectively. The limiting plate (23) is fixedly arranged on the top wall of the connecting plate (22); a guide groove (231) is provided on the limiting plate (23); the sliding plate (34) is engaged in the guide groove (231), and the sliding plate (34) can slide along the inner cavity of the guide groove (231).

6. The axially flexible floating device according to claim 5, characterized in that: Limiting grooves (341) are provided on both sides of the sliding plate (34) in the length direction, and limiting bosses (2311) are integrally provided on both side walls of the guide groove (231) in the length direction, and the limiting bosses (2311) are engaged in the limiting grooves (341).

7. The axially flexible floating device according to claim 3, characterized in that: The first air valve (313) is in communication with the first piston cylinder (311), and the second air valve (323) is in communication with the second piston cylinder (321); The first air valve (313) and the second air valve (323) are both connected to an external air pressure regulating device.

8. The axially flexible floating device according to claim 3, characterized in that: One end of the communicating tube (33) is in communication with the first piston cylinder (311), and the other end is in communication with the second piston cylinder (321).

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