A radial stiffness measuring device for an air static pressure spindle

Abstract

The present invention discloses a radial stiffness measuring device for an air static pressure spindle, comprising a support frame, the support frame is composed of two plane plates and a plurality of support columns, the two plane plates are fixedly connected to the plurality of support columns, the two plane plates are arranged parallel to each other, a locking assembly is arranged on the plane plate at the top, a force loading device, a force sensor and a displacement sensor are connected to the two plane plates through an adjusting assembly, and the height of the force loading device, the force sensor and the displacement sensor in the vertical direction can be adjusted through the adjusting assembly. The present invention arranges a locking assembly, vertically places the air static pressure spindle into a through hole, and pulls an operating rod to rotate the ring body accordingly, driving each linkage rod to rotate accordingly, and driving the adjusting rod to extend toward the center of the through hole, until a plurality of rubber blocks synchronously clamp the air static pressure spindle in the through hole, ensuring that the air static pressure spindle is always at the center when clamped, thereby improving the measurement accuracy.

Description

Technical Field

[0001] The invention relates to the technical field of measuring equipment, and in particular to a radial stiffness measuring device for an air static pressure spindle. Background Art

[0002] The air static pressure spindle is a type of bearing that uses gas (mostly air) as the lubricating medium. It has the advantages of high precision, no wear and long life, and is widely used in ultra-precision cutting machine tools.

[0003] The patent document with publication number CN206339380U and titled "A radial stiffness measuring device for an air static pressure spindle" discloses that the bracket is placed on a vibration isolation foundation; the air static pressure spindle is vertically fixed on the bracket, the air static pressure spindle rotor of the air static pressure spindle is suspended in the air static pressure spindle housing, the gap between the air static pressure spindle rotor and the air static pressure spindle housing is an air static pressure spindle air film formed by compressed air, and the bottom of the air static pressure spindle housing is fixed on the bracket; the force sensor B is fixed in front of the horizontally placed force loading device B. The rear end of the force loading device B is fixed on the bracket, the force sensor B and the force loading device B are fixedly installed on the lower part of the air static pressure main shaft, and the upper part of the air static pressure main shaft corresponds to the force sensor A and the force loading device A with the same installation structure; the bracket is equipped with displacement sensor A, displacement sensor C and displacement sensor B, displacement sensor A measures the radial clearance change △HA of the air film of the air static pressure main shaft, displacement sensor B measures the radial clearance change △HB of the air film of the air static pressure main shaft, and displacement sensor C measures the deformation △HC of the air static pressure main shaft;

[0004] The above technical solution realizes the effective separation of the radial deformation error of the aerostatic spindle during the measurement process, thereby improving the measurement accuracy of the radial stiffness of the aerostatic spindle. However, the inventors also found the following defects:

[0005] The air static pressure spindle is vertically fixed on the bracket. The traditional fixing method of the air static pressure spindle is difficult to ensure that the air static pressure spindle will not deviate during the pressure measurement process, which can easily lead to inaccurate measurement results. Summary of the invention

[0006] The purpose of the present invention is to provide a radial stiffness measuring device for an air static pressure spindle, which has the function of stabilizing the air static pressure spindle under pressure to improve the measurement accuracy.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A radial stiffness measuring device for an air static pressure spindle comprises a support frame, wherein the support frame is composed of two plane plates and a plurality of support columns, the two plane plates are fixedly connected to the plurality of support columns, and the two plane plates are arranged parallel to each other up and down, a locking assembly is arranged on the plane plate at the top, a force loading device, a force sensor and a displacement sensor are connected to the two plane plates through an adjustment assembly, and the height of the force loading device, the force sensor and the displacement sensor in the vertical direction can be adjusted through the adjustment assembly.

[0009] Preferably, the locking assembly includes a circular through hole passing through the flat plate at the top and a chamber opened inside the flat plate, and at least two matching blocks are fixedly connected at the four corners of the chamber, and the matching block has an arc surface. A ring body is arranged in the chamber, and the outer edge of the ring body is adapted to the arc surface, and the ring body is slidably connected to the matching block.

[0010] Preferably, at least three fixing seats are fixedly connected to the inner peripheral side wall of the ring body, and the fixing seat is rotatably connected to a linkage rod by a pin shaft. The other end of the linkage rod is rotatably connected to an adjustment rod by a pin shaft, and the other end of the adjustment rod extends through the chamber to the center of the through hole and is fixedly connected to a rubber block.

[0011] Preferably, the upper plane plate is provided with an operating slot, an outer peripheral side wall of the ring body is fixedly connected with an operating rod, and the operating rod partially extends out of the operating slot.

[0012] Preferably, the upper flat plate is fixedly connected to a fixed block, the fixed block is at the same height as the operating rod, the fixed block has a threaded groove and is threadedly connected to a first threaded rod, one end of the first threaded rod is fixedly connected to a cushion block.

[0013] Preferably, the upper flat plate is fixedly connected to a fixing rod, the fixing rod and the operating rod are at the same height, the operating rod is tied with a rope, the rope passes around the fixing rod and extends downward, and is connected to a counterweight.

[0014] Preferably, the rope body is further provided with a plurality of detachable weight blocks, and the weight blocks are provided with mounting grooves extending from the outer edges of the weight blocks to the center thereof.

[0015] Preferably, the adjustment assembly contains two vertical blocks, and the two vertical blocks in the same group are relatively fixedly connected to the flat plate. The vertical blocks are provided with a vertical groove, and the vertical groove is rotatably connected to a second threaded rod. The vertical groove is slidably connected to an adjustment block, and the adjustment block has a threaded groove, which is threadedly connected to the second threaded rod.

[0016] Preferably, the two adjustment blocks in the same group are respectively connected to a force loading device and a displacement sensor, and the force applying end of the force loading device is connected to the force sensor.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention sets a locking assembly, vertically places the air static pressure spindle to be measured into the through hole, and pulls the operating rod to make the ring body rotate accordingly, driving each linkage rod to rotate accordingly, and driving the adjustment rod to extend toward the center of the through hole until multiple rubber blocks synchronously clamp the air static pressure spindle in the through hole, ensuring that the air static pressure spindle is always in the center when clamped, thereby improving the measurement accuracy.

[0019] 2. The present invention provides a first threaded rod and a counterweight block that can interfere with each other, which can stabilize the operating rod, thereby ensuring that the air static pressure spindle is firmly clamped and improving measurement accuracy.

[0020] 3. The present invention arranges an adjustment component so that the height of the force loading device, the force sensor and the displacement sensor can be adjusted, thereby achieving height adjustment of the force loading device, the force sensor and the displacement sensor, which is convenient for measuring air static pressure spindles of different heights and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the structure of a radial stiffness measuring device for an air static pressure spindle provided by the present invention, comprising a first threaded rod;

[0022] Figure 2 A schematic diagram of the cross-sectional structure of one of the plane plates in a radial stiffness measuring device for an air static pressure spindle proposed by the present invention;

[0023] Figure 3 A schematic diagram of the structure of a radial stiffness measuring device for an air static pressure spindle including a counterweight block proposed by the present invention;

[0024] Figure 4 A schematic diagram of the connection structure between one of the vertical blocks and the corresponding adjustment block in a radial stiffness measurement device for an air static pressure spindle proposed by the present invention;

[0025] Figure 5 The present invention provides a schematic structural diagram of a weight block in a radial stiffness measuring device for an air static pressure spindle.

[0026] In the figure:

[0027] 10. Support frame; 11. Flat plate; 12. Support column;

[0028] 20. through hole; 21. chamber; 22. matching block; 23. arc surface; 24. ring body; 25. fixed seat; 26. linkage rod; 27. adjustment rod; 28. rubber block; 29. ​​operating groove; 210. operating rod;

[0029] 30. Fixed block; 31. First threaded rod; 32. Cushion block; 33. Fixed rod; 34. Rope body; 35. Counterweight block; 36. Weight block; 37. Mounting slot;

[0030] 40. Vertical block; 41. Vertical slot; 42. Second threaded rod; 43. Adjustment block. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] Reference Figure 1-Figure 5A radial stiffness measuring device for an air static pressure spindle includes a support frame 10, which is composed of two plane plates 11 and a plurality of support columns 12. The two plane plates 11 are fixedly connected to the plurality of support columns 12, and the two plane plates 11 are arranged parallel to each other up and down, and a locking assembly is arranged on the upper plane plate 11. A force loading device, a force sensor and a displacement sensor are connected to the two plane plates 11 through an adjusting assembly, and the height of the force loading device, the force sensor and the displacement sensor in the vertical direction can be adjusted through the adjusting assembly.

[0035] It should be noted that the method and steps for detecting the air static pressure spindle using a force loading device, a force sensor and a displacement sensor are all existing technologies and will not be described in detail here.

[0036] Furthermore, the locking assembly includes a circular through hole 20 passing through the upper flat plate 11 and a chamber 21 opened inside the flat plate 11. At least two matching blocks 22 are fixedly connected at the four corners of the chamber 21. The matching block 22 has an arc surface 23. A ring body 24 is arranged in the chamber 21. The outer edge of the ring body 24 is adapted to the arc surface 23, and the ring body 24 is slidably connected to the matching block 22.

[0037] The two matching blocks 22 are arranged opposite to each other and are located on the diagonal line of the chamber 21, so that the ring body 24 can rotate relative to the chamber 21;

[0038] Furthermore, at least three fixing seats 25 are fixedly connected to the inner side wall of the ring body 24, and the fixing seat 25 is rotatably connected to a linkage rod 26 by a pin shaft. The other end of the linkage rod 26 is rotatably connected to an adjustment rod 27 by a pin shaft. The other end of the adjustment rod 27 extends through the chamber 21 to the center of the through hole 20 and is fixedly connected to a rubber block 28.

[0039] Reference Figure 2 In this state, the rubber block 28 on the adjusting rod 27 is closest to the center of the through hole 20 .

[0040] Furthermore, an operating slot 29 is formed in the upper plane plate 11 , and an operating rod 210 is fixedly connected to the outer peripheral side wall of the ring body 24 , and the operating rod 210 partially extends out of the operating slot 29 .

[0041] By pulling the operating rod 210, the ring body 24 is driven to rotate, thereby adjusting the adjusting rod 27, and the air static pressure main shafts with different diameters can be firmly clamped.

[0042] Furthermore, the upper flat plate 11 is fixedly connected with a fixing block 30 , which is at the same height as the operating rod 210 . The fixing block 30 has a threaded groove and is threadedly connected with a first threaded rod 31 , one end of which is fixedly connected with a cushion block 32 .

[0043] In order to ensure the stable clamping of the air static pressure main shaft in the through hole 20, the above technical scheme is provided, by controlling the first threaded rod 31, thereby the stable resistance of the operating rod 210, thereby ensuring the stable clamping of the air static pressure main shaft with different diameters.

[0044] Furthermore, the upper plane plate 11 is fixedly connected with a fixing rod 33 , the fixing rod 33 and the operating rod 210 are at the same height, the operating rod 210 is tied with a rope 34 , the rope 34 passes around the fixing rod 33 and extends downward, and is connected with a counterweight 35 .

[0045] In order to ensure the stable clamping of the air static pressure main shaft in the through hole 20, another technical solution is provided. Under the action of gravity of the counterweight block 35, the operating rod 210 is always pulled, so that the operating rod 210 is stable and motionless, ensuring the stable clamping of the air static pressure main shaft of different diameters.

[0046] Furthermore, the rope body 34 is provided with a plurality of detachable weight blocks 36 , each of which is provided with a mounting groove 37 extending from the outer edge of the weight block 36 to the center thereof.

[0047] The weight block 36 is provided to cooperate with the counterweight block 35 to play a weighting role.

[0048] Furthermore, the adjustment assembly contains two vertical blocks 40. The two vertical blocks 40 in the same group are relatively fixedly connected to the flat plate 11. The vertical blocks 40 are provided with a vertical groove 41. The vertical groove 41 is rotatably connected to a second threaded rod 42. The vertical groove 41 is slidably connected to an adjustment block 43. The adjustment block 43 has a threaded groove and is threadedly connected to the second threaded rod 42.

[0049] The above technical solution is to adjust the height of the force loading device, the force sensor and the displacement sensor in the vertical direction, so as to adapt to the air static pressure spindles of different heights.

[0050] Furthermore, the two adjustment blocks 43 of the same group are respectively connected to the force loading device and the displacement sensor, and the force applying end of the force loading device is connected to the force sensor.

[0051] Working principle of the present invention:

[0052] First, remove the restriction of the first threaded rod 31 on the operating rod 210, and pull the operating rod 210 so that the ring body 24 is attached. Figure 2 Rotate counterclockwise to a critical end, at which time each adjusting rod 27 is farthest from the center of the through hole 20;

[0053] The main shaft of the air static pressure to be measured is placed vertically into the through hole 20, and the operating rod 210 is pulled in the opposite direction so that the ring body 24 is attached. Figure 2The clockwise rotation drives each linkage rod 26 to rotate accordingly, and drives the adjustment rod 27 to extend toward the center of the through hole 20, until the multiple rubber blocks 28 synchronously clamp the air static pressure spindle in the through hole 20;

[0054] By adjusting the first threaded rod 31, the pad 32 is tightly against the operating rod 210, thereby ensuring a stable clamping of the air static pressure spindle;

[0055] Alternatively, the operating rod 210 is directly stabilized and immobilized by the gravity of the counterweight block 35 and the weight block 36, thereby ensuring a stable clamping of the air static pressure main shaft;

[0056] In addition, the second threaded rod 42 can also be rotated. When the second threaded rod 42 rotates, the adjustment block 43 threadedly connected thereto will move up and down as the second threaded rod 42 rotates in different directions, thereby achieving height adjustment of the force loading device, force sensor and displacement sensor, which is convenient for measuring air static pressure spindles at different heights.

[0057] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A radial stiffness measuring device for an air static pressure spindle, characterized in that: The invention comprises a support frame (10), wherein the support frame (10) is composed of two plane plates (11) and a plurality of support columns (12), wherein the two plane plates (11) are fixedly connected to the plurality of support columns (12), and the two plane plates (11) are arranged parallel to each other in an upper direction, and a locking assembly is arranged on the plane plate (11) located at the upper side, wherein the locking assembly comprises a circular through hole (20) penetrating the plane plate (11) located at the upper side and a chamber (21) provided inside the plane plate (11), wherein the chamber (21) is provided inside the plane plate (11), and wherein the chamber (21) is provided inside the plane plate (11). 1) at four corners thereof, at least two matching blocks (22) are fixedly connected, the matching blocks (22) having an arc surface (23), a ring body (24) is arranged in the chamber (21), the outer edge of the ring body (24) is matched with the arc surface (23), the ring body (24) is slidably connected to the matching blocks (22), at least three fixing seats (25) are fixedly connected to the inner peripheral side wall of the ring body (24), the fixing seats (25) are rotatably connected to a linkage rod (26) by means of a pin shaft, and the linkage rod (26) is The other end is rotatably connected to an adjusting rod (27) by means of a pin shaft. The other end of the adjusting rod (27) passes through the chamber (21) and extends toward the center of the through hole (20), and is fixedly connected to a rubber block (28). A force loading device, a force sensor and a displacement sensor are connected to the two plane plates (11) by means of an adjusting assembly. The heights of the force loading device, the force sensor and the displacement sensor in the vertical direction can be adjusted by means of the adjusting assembly. The adjusting assembly comprises two vertical blocks (40). The two vertical blocks (40) of the same group are relatively fixedly connected to the plane plate (11). The vertical blocks (40) are provided with a vertical groove (41). The vertical groove (41) is rotatably connected to a second threaded rod (42). The vertical groove (41) is slidably connected to an adjusting block (43). The adjusting block (43) has a threaded groove and is threadedly connected to the second threaded rod (42). The two adjusting blocks (43) of the same group are respectively connected to the force loading device and the displacement sensor. The force applying end of the force loading device is connected to the force sensor.

2. The radial stiffness measuring device of an air static pressure spindle according to claim 1, characterized in that: The upper plane plate (11) is provided with an operating slot (29), and an operating rod (210) is fixedly connected to the outer peripheral side wall of the ring body (24), and the operating rod (210) partially extends out of the operating slot (29).

3. The radial stiffness measuring device of an air static pressure spindle according to claim 2, characterized in that: The upper flat plate (11) is fixedly connected to a fixing block (30), the fixing block (30) and the operating rod (210) being at the same height, the fixing block (30) having a threaded groove and being threadedly connected to a first threaded rod (31), one end of the first threaded rod (31) being fixedly connected to a cushion block (32).

4. The radial stiffness measuring device of an air static pressure spindle according to claim 2, characterized in that: The upper flat plate (11) is fixedly connected to a fixing rod (33), the fixing rod (33) and the operating rod (210) are at the same height, the operating rod (210) is tied with a rope (34), the rope (34) passes over the fixing rod (33), extends downward, and is connected to a counterweight (35).

5. The radial stiffness measuring device of an air static pressure spindle according to claim 4, characterized in that: The rope body (34) is also provided with a plurality of detachable weight blocks (36), each of which is provided with a mounting groove (37), and the mounting groove (37) extends from the outer edge of the weight block (36) to the center thereof.

Images