Flexible fixed supporting structure for heavy lead screw measurement

Abstract

The utility model relates to the technical field of mechanical equipment, and discloses a flexible fixed supporting structure for heavy lead screw measurement, which is characterized in that a bottom plate of a supporting seat is fixedly connected with a supporting cylinder, the lower surface of the bottom plate is provided with a guide rail matched with a sliding rail of a measuring instrument, and a spiral lifting mechanism is arranged in the supporting cylinder; the spiral lifting mechanism comprises a nut which is rotationally connected to a supporting cylinder and provided with an internal thread, a stud in threaded connection with the nut is arranged in the supporting cylinder, a limiting assembly used for limiting the stud to move up and down is arranged between the stud and the supporting cylinder, the stud is provided with a containing cavity with an upward opening, and a sliding part capable of moving up and down is embedded in the containing cavity. An elastic assembly is arranged between the bottom of the containing cavity and the sliding part, and a roller assembly used for supporting the heavy lead screw is arranged above the sliding part. According to the utility model, the height of the roller assembly is convenient and rapid to adjust, the stability is good, the elastic assembly carries out self-adaptive adjustment on the radial run-out of the heavy lead screw, a measuring instrument is effectively protected, and instrument damage caused by rigid support is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical equipment, and in particular relates to a flexible fixed support structure for measuring a heavy lead screw. Background Art

[0002] The use of a screw stroke measuring instrument requires a fixed support as an installation and positioning element. The screw is usually measured by clamping the headstock and tailstock tops. Fixed supports of different numbers and specifications are configured as auxiliary positioning according to the aspect ratio of the screw.

[0003] At present, the measuring instruments of heavy-duty screws usually adopt "rigid fixed support" to overcome the influence of screw deflection on measurement. However, due to the strong rigidity of heavy-duty screws, the use of traditional fixed support will increase the contact stress. Due to the outer diameter runout, taper or non-concentricity of the top holes at both ends of the heavy-duty screw, a large additional load will be generated on the spindle and tailstock, which may cause damage to the measuring instrument in severe cases. Utility Model Content

[0004] The utility model provides a flexible fixed support structure for heavy-duty lead screw measurement. The flexible fixed support can perform adaptive adjustment on the radial runout of the heavy-duty lead screw, effectively protect the measuring instrument, and avoid instrument damage caused by the rigid support.

[0005] The above-mentioned purpose of the utility model is achieved through the following technical solutions:

[0006] A flexible fixed support structure for measuring heavy-duty screws, comprising a support seat, the support seat comprising a rectangular base plate and a support tube, the support tube being fixedly connected to the upper surface of the base plate, the lower surface of the base plate being provided with a guide rail cooperating with a slide rail of a measuring instrument, a spiral lifting mechanism being provided in the support tube, the spiral lifting mechanism comprising a nut with an internal thread rotatably connected to the support tube, a stud being provided in the support tube and being screwed to the nut, a limit assembly being provided between the stud and the support tube for limiting the up and down movement of the stud, the stud being provided with an upwardly opening accommodating cavity, a sliding portion which can move up and down being embedded in the accommodating cavity, an elastic assembly being provided between the bottom of the accommodating cavity and the sliding portion, and a roller assembly for supporting the heavy-duty screw being provided above the sliding portion.

[0007] The above-mentioned flexible fixed support structure for heavy-duty screw measurement, wherein the sliding part includes a support plate and a slide column, the slide column is fixedly connected below the support plate, the support plate and the slide column are integrally formed, and the slide column is slidably arranged in the accommodating cavity.

[0008] The above-mentioned flexible fixed support structure for heavy-duty screw measurement, wherein the elastic component includes a T-shaped connecting rod and an elastic member, a mounting groove with an upper opening is provided in the center of the sliding part, a sliding hole connected to the mounting groove is provided in the center of the sliding column, the connecting rod is passed through a sliding hole downward from the mounting groove, the elastic member is sleeved on the connecting rod, the upper and lower ends of the elastic member are respectively abutted against the bottom of the sliding column and the bottom of the accommodating cavity, the elastic member is a plurality of disc springs alternately stacked positively and negatively, a screw hole connected to the accommodating cavity is provided in the center of the bottom of the stud, the bottom end of the connecting rod is provided with a necked screw screwed to the screw hole, and a top screw abutting against the necked screw is screwed in the screw hole.

[0009] The above-mentioned flexible fixed support structure for heavy-duty screw measurement, wherein the roller assembly includes a roller seat, a support arm and a roller, the support arm includes two groups and is symmetrically distributed on the upper surface of the roller seat along the center of the roller seat, each group of the support arms is rotatably connected to a horizontal roller, the axes of the two rollers are parallel to each other, and the roller seat is provided with a through axial hole near the edge, a fixing screw is embedded in the axial hole, and the bottom end of the fixing screw is screwed to the support plate.

[0010] The above-mentioned flexible fixed support structure for heavy-duty screw measurement, wherein the top of the support tube is provided with a stepped cylinder, the lower end of the nut is provided with a ring sleeve adapted to the stepped cylinder along the circumferential direction, and a positioning mechanism is provided between the stepped cylinder and the ring sleeve; the positioning mechanism includes a positioning groove arranged along the circumferential direction of the stepped cylinder, the side wall of the ring sleeve is provided with a through positioning hole, and the positioning hole is threadedly connected to a positioning screw embedded in the positioning groove.

[0011] The above-mentioned flexible fixed support structure for heavy-duty screw measurement, wherein the limit assembly includes a limit pin and a locking screw, the outer wall of the stud is provided with a vertical groove along its axial direction, the stepped column surface is provided with a through limit hole, the limit hole is provided with a limit pin vertically embedded in the vertical groove, the limit pin and the limit hole are interference fit; the locking screw is threadedly connected to the side wall of the support tube and embedded in the vertical groove.

[0012] The above-mentioned flexible fixed support structure for heavy-duty screw measurement, wherein the outer wall of the nut is provided with a plurality of insertion holes for inserting the rotating rod along the circumferential direction.

[0013] In the above-mentioned flexible fixed support structure for heavy-duty lead screw measurement, the internal thread of the nut and the external thread of the stud are mutually meshing trapezoidal threads.

[0014] The above-mentioned flexible fixed support structure for heavy-duty screw measurement, wherein the bottom outer wall of the support tube is screwed with a mounting ring, and the mounting ring includes at least two and is evenly distributed along the circumference of the support tube.

[0015] In summary, the beneficial technical effects of the utility model are:

[0016] The utility model is provided with a rotatable nut on the support tube of the support seat, a stud screwed with the nut is provided in the support tube, a limit assembly for limiting the stud to move up and down is provided between the stud and the support tube, the stud is provided with an upwardly opening accommodating cavity, a sliding part that can move up and down is embedded in the accommodating cavity, an elastic assembly is provided between the bottom of the accommodating cavity and the sliding part, and a roller assembly for supporting a heavy-duty lead screw is provided above the sliding part. The height of the stud can be adjusted by rotating the nut, thereby adjusting the height of the roller assembly, and the elastic assembly can adaptively adjust the radial runout of the heavy-duty lead screw, effectively protecting the measuring instrument and avoiding damage to the instrument caused by rigid support. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model;

[0018] Figure 2 It is a schematic diagram of the use state of the utility model;

[0019] Figure 3 yes Figure 2 A cross-sectional view of

[0020] Figure 4 It is an exploded view of the utility model.

[0021] Figure, 1, support seat; 11, bottom plate; 111, guide rail; 1111, first guide rail; 1112, second guide rail; 12, support tube; 121, stepped cylinder; 1211, positioning groove; 2, spiral lifting mechanism; 21, nut; 211, ring sleeve; 2111, positioning hole; 2112, positioning screw; 2113, limiting hole; 212, jack; 22, stud; 221, accommodating cavity; 222, screw hole; 223, vertical groove; 23 , limit assembly; 231, limit pin; 232, locking screw; 3, sliding part; 31, support plate; 32, sliding column; 33, mounting groove; 34, sliding hole; 4, elastic assembly; 41, connecting rod; 411, necking screw; 42, elastic part; 43, top screw; 44, adjustment gasket; 5, roller assembly; 51, roller seat; 511, shaft hole; 52, support arm; 53, roller; 54, fixing screw; 6, mounting ring; 7, heavy-duty screw. DETAILED DESCRIPTION

[0022] The following is combined with Figure 1-4 The utility model is described in further detail.

[0023] like Figure 1-4As shown, a flexible fixed support structure for heavy-duty screw measurement includes a support seat 1, the support seat 1 includes a rectangular bottom plate 11 and a support tube 12, the support tube 12 is fixedly connected to the upper surface of the bottom plate 11, the support tube 12 and the bottom plate 11 are integrally formed, the support tube 12 is cylindrical, the lower surface of the bottom plate 11 is provided with a guide rail 111 that cooperates with the slide rail of the measuring instrument, the center of the bottom plate 11 is provided with a through hole that communicates with the inner cavity of the support tube 12, and the support tube 12 is provided with a spiral lifting mechanism 2, the spiral lifting mechanism 2 includes the support tube 12 A nut 21 with an internal thread is rotatably connected to the upper part, a stud 22 threadedly connected to the nut 21 is provided in the support tube 12, a limit assembly 23 is provided between the stud 22 and the support tube 12 for limiting the up and down movement of the stud 22, the stud 22 is provided with an upwardly opening accommodating cavity 221, the accommodating cavity 221 is a cylindrical cavity, a sliding part 3 that can move up and down is embedded in the accommodating cavity 221, an elastic assembly 4 is provided between the bottom of the accommodating cavity 221 and the sliding part 3, and a roller assembly 5 for supporting the heavy-duty screw 7 is provided above the sliding part 3.

[0024] By rotating the nut 21 on the support tube 12, the stud 22 can move up and down along the axial direction of the nut 21 through the limitation of the limit assembly 23, thereby adjusting the height of the roller assembly 5 connected to the sliding part 3 relative to the support seat 1 in the axial direction; the elastic assembly 4 can adaptively adjust its height according to the outer diameter runout of the heavy-duty screw 7 to avoid damage to the measuring instrument caused by rigid support.

[0025] like Figure 3 , 4 As shown, the sliding part 3 includes a support plate 31 and a slide column 32 . The slide column 32 is fixedly connected below the support plate 31 . The support plate 31 and the slide column 32 are both coaxial cylinders. The support plate 31 and the slide column 32 are integrally formed. The slide column 32 is slidably disposed in the accommodating cavity 221 .

[0026] like Figure 3 , 4As shown, the elastic component 4 of this embodiment includes a T-shaped connecting rod 41 and an elastic member 42. The sliding portion 3 is provided with an upper opening mounting groove 33 in the center, and the sliding column 32 is provided with a sliding hole 34 connected to the mounting groove 33 in the center. The connecting rod 41 passes through the mounting groove 33 downward to form the sliding hole 34. The elastic member 42 is sleeved on the connecting rod 41 passing through the sliding portion 3. The upper end and the lower end of the elastic member 42 are respectively abutted against the bottom of the sliding column 32 and the bottom of the accommodating cavity 221. The elastic member 42 of this embodiment uses a plurality of disc springs alternately stacked in positive and negative directions. The bottom center of the stud 22 is provided with a connecting hole 34 connected to the accommodating cavity 221. The screw hole 222 of the cavity 221, the bottom end of the connecting rod 41 is provided with a necked screw 411 screwed with the screw hole 222, and the screw hole 22 is screwed with a top screw 43 that abuts against the necked screw 411; the top screw 43 can be installed and adjusted through the through hole in the center of the bottom plate 11, and the top end of the top screw 43 abuts against the bottom end of the necked screw 411, thereby improving the firmness of the connection between the connecting rod 41 and the stud 22, avoiding the loosening of the connecting rod 41 caused by the impact and vibration of the sliding column 32 on the connecting rod 41 when the sliding column 32 slides on the accommodating cavity 221, thereby improving the working stability of the elastic component 4.

[0027] like Figure 3 As shown, in another embodiment, the connecting rod 41 is sleeved with an adjusting gasket 44, the upper end of the adjusting gasket 44 abuts against the elastic member 42, and the lower end of the adjusting gasket 44 abuts against the bottom of the accommodating cavity 221. According to the weight of the heavy lead screw 7 and the thickness of the multiple disc springs, the adjusting gasket 44 of corresponding thickness is set to ensure that there is no gap between adjacent disc springs when the assembled multiple disc springs have a slight pre-pressure, thereby improving the stability of the elastic force of the elastic member 42.

[0028] like Figure 3 , 4 The roller assembly 5 shown includes a roller seat 51, a support arm 52 and a roller 53. The support arm 52 includes two groups and is symmetrically distributed on the upper surface of the roller seat 51 along the center of the roller seat 51. Each group of support arms 52 is rotatably connected to a horizontal roller 53. The axes of the two rollers 53 are parallel to each other. The heavy-duty screw 7 is arranged in parallel with the two rollers 53 and abuts against the two rollers 53. The spacing between the two rollers 53 ensures that it is adapted to the busbar position of the heavy-duty screw 7. A through axial hole 511 is provided near the edge of the roller seat 51. A fixing screw 54 is embedded in the axial hole 511. The bottom end of the fixing screw 54 is screwed to the support plate 31. In this embodiment, two axial holes 511 are symmetrically arranged relative to the center of the roller seat 51. Corresponding fixing screws 54 are embedded in the two axial holes 511 and are screwed and fastened to the support plate 31 to ensure the stability of the roller assembly 5 on the sliding portion 3.

[0029] During specific implementation, 2-4 flexible fixed supports can be arranged in the length direction of the heavy-duty lead screw 7 to be used for measuring the flexibly supported heavy-duty lead screw 7 .

[0030] like Figure 3As shown, a stepped cylinder 121 is provided on the top of the support tube 12, a ring sleeve 211 adapted to the stepped cylinder 121 is provided circumferentially at the lower end of the nut 21, the nut 21 and the ring sleeve 211 are coaxially arranged, and a positioning mechanism is provided between the stepped cylinder 121 and the ring sleeve 211; the positioning mechanism includes a positioning groove 1211 arranged circumferentially on the stepped cylinder 121, a through positioning hole 2111 is provided on the side wall of the ring sleeve 211, and the positioning hole 2111 is threadedly connected to a positioning screw embedded in the positioning groove 1211.

[0031] By setting up a positioning mechanism, it can be ensured that when the nut 21 is horizontally rotated on the support tube 12, the stud 22 can move up and down along the axial direction of the nut 21 inside the nut 21, thereby avoiding displacement between the nut 21 and the support tube 12 in the axial direction of the nut 21, thereby ensuring the normal operation of the spiral lifting mechanism 2.

[0032] In this embodiment, two positioning holes 2111 are provided, and the two positioning holes 2111 are symmetrically arranged along the center of the ring sleeve 211. A positioning screw 2112 embedded in the positioning groove 1211 is threaded into each positioning hole 2111. By providing two symmetrical positioning screws 2112, it can be ensured that the force on the nut 21 is balanced when the nut 21 is rotated.

[0033] like Figure 3 , 4 As shown, the limiting assembly 23 includes a limiting pin 231 and a locking screw 232. The outer wall of the stud 22 is provided with a vertical groove 223 along its axial direction. The stepped cylindrical surface 121 is provided with a through limiting hole 2113. The limiting hole 2113 is provided with a limiting pin 231 vertically embedded in the vertical groove 223. The limiting pin 231 and the limiting hole 2113 are interference fit, so as to ensure that when the nut 21 is rotated horizontally, the stud 22 can be limited by the limiting pin 231 on the vertical groove 223, so that the stud 22 can be relative to the nut 21 in the nut. The locking screw 232 is screwed to the side wall of the support tube 12 and embedded in the vertical groove 223, and the locking screw 232 is in contact with the stud 22. After the roller assembly 5 is adjusted to an appropriate height by rotating the nut 21, the locking screw 232 is rotated to make the locking screw 232 and the stud 22 abut against each other and be pressed tightly, which can ensure the stability of the stud 22, avoid the stud 22 from moving up and down under the action of external force, and improve the measurement accuracy of the heavy-duty lead screw 7.

[0034] In this embodiment, the limiting hole 2113 is communicated with the positioning groove 1211 .

[0035] like Figure 1 , 4 As shown, the outer wall of the nut 21 is provided with a plurality of insertion holes 212 for inserting the rotating rods along the circumferential direction. When the nut 21 is rotated, the rotating rods can be inserted into the insertion holes 212, and the nut 21 can be conveniently rotated by holding the rotating rods.

[0036] The internal thread of the nut 21 and the external thread of the stud 22 are trapezoidal threads that mesh with each other. Trapezoidal threads have a good self-locking function. After adjusting the nut 21, the meshing trapezoidal threads can withstand a certain axial force without rotating, avoiding the up and down movement of the stud 22 during the measurement process.

[0037] To facilitate the handling and installation of the flexible fixed support, a lifting ring is screwed and installed on the bottom outer wall of the support cylinder 12. There are at least two installation lifting rings 6 and they are evenly distributed along the circumferential direction of the support cylinder 12.

[0038] The guide rail 111 includes a first guide rail 1111 and a second guide rail 1112 that are parallel to each other. The cross-section of the first guide rail 1111 is an inverted V shape, and the cross-section of the second guide rail 1112 is a "U" shape. The guide rail 111 is finished by scraping and is in precise fit with the slide rail of the measuring instrument, ensuring good contact and no deformation under force.

[0039] The screw jacking mechanism 2 and the roller assembly 5 are designed according to the diameter range of the heavy-duty lead screw 7 and the center height of the measuring instrument.

[0040] Before measuring the heavy-duty lead screw 7, use a crane to place the flexible fixed support on the slide rail of the measuring instrument, and place the heavy-duty lead screw 7 on the roller assembly 5. Coarsely adjust the level by rotating the nut 21. Keep the heavy-duty lead screw 7 stationary, rotate the main shaft, and after adjusting the concentricity between the outer circle of the shaft of the heavy-duty lead screw 7 and the main shaft dial, then tighten the heavy-duty lead screw 7 with double center points. Due to the relatively strong rigidity of the heavy-duty lead screw 7, there may be situations such as outer diameter runout, taper, or non-concentricity of the two end center holes. During measurement, it will bring a large additional load to the main shaft and the tailstock, and may seriously damage the measuring instrument.

[0041] With this flexible fixed support, the elastic component 4 can adaptively adjust the runout of the heavy-duty lead screw 7, reducing the alignment requirements for the heavy-duty lead screw 7, shortening the measurement installation time, improving the measurement efficiency, playing a good protective role for the headstock, tailstock and coaxial accuracy of the instrument, and avoiding damage to the measuring instrument.

[0042] The embodiments of this specific implementation manner are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore: All equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A flexible fixed support structure for heavy-duty screw measurement, characterized in that: The invention comprises a support seat, which comprises a rectangular base plate and a support tube, wherein the support tube is fixedly connected to the upper surface of the base plate, the lower surface of the base plate is provided with a guide rail which cooperates with the slide rail of the measuring instrument, a spiral lifting mechanism is provided in the support tube, and the spiral lifting mechanism comprises a nut with an internal thread which is rotatably connected to the support tube, a stud which is threadedly connected to the nut is provided in the support tube, a limit assembly for limiting the up and down movement of the stud is provided between the stud and the support tube, the stud is provided with an upwardly opening accommodating cavity, a sliding part which can move up and down is embedded in the accommodating cavity, an elastic assembly is provided between the bottom of the accommodating cavity and the sliding part, and a roller assembly for supporting a heavy-duty lead screw is provided above the sliding part.

2. The flexible fixed support structure for heavy-duty screw measurement according to claim 1, characterized in that: The sliding part comprises a support plate and a sliding column, wherein the sliding column is fixedly connected below the support plate, the support plate and the sliding column are integrally formed, and the sliding column is slidably arranged in the accommodating cavity.

3. The flexible fixed support structure for heavy-duty screw measurement according to claim 2, characterized in that: The elastic component includes a T-shaped connecting rod and an elastic member, and a mounting groove with an upper opening is provided in the center of the sliding part. A sliding hole connected to the mounting groove is provided in the center of the sliding column, the connecting rod is penetrated downward from the mounting groove to form a sliding hole, the elastic member is sleeved on the connecting rod, the upper and lower ends of the elastic member are respectively abutted against the bottom of the sliding column and the bottom of the accommodating cavity, the elastic member is a plurality of disc springs alternately stacked in positive and negative directions, a screw hole connected to the accommodating cavity is provided in the center of the bottom of the stud, the bottom end of the connecting rod is provided with a necked screw threadedly connected to the screw hole, and a top screw abutting against the necked screw is threadedly connected in the screw hole.

4. The flexible fixed support structure for heavy-duty screw measurement according to claim 2, characterized in that: The roller assembly includes a roller seat, a support arm and a roller. The support arm includes two groups and is symmetrically distributed on the upper surface of the roller seat along the center of the roller seat. A horizontal roller is rotatably connected to each group of the support arms. The axes of the two rollers are parallel to each other. A through axial hole is provided near the edge of the roller seat. A fixing screw is embedded in the axial hole. The bottom end of the fixing screw is screwed to the support plate.

5. The flexible fixed support structure for heavy-duty screw measurement according to claim 1, characterized in that: A stepped cylinder is provided on the top of the support tube, a ring sleeve is provided circumferentially at the lower end of the nut and is adapted to the stepped cylinder, and a positioning mechanism is provided between the stepped cylinder and the ring sleeve; the positioning mechanism includes a positioning groove arranged circumferentially on the stepped cylinder, a through positioning hole is provided on the side wall of the ring sleeve, and the positioning hole is threadedly connected to a positioning screw embedded in the positioning groove.

6. The flexible fixed support structure for heavy-duty lead screw measurement according to claim 5, characterized in that: The limit assembly includes a limit pin and a locking screw. The outer wall of the stud is provided with a vertical groove along its axial direction. The stepped column surface is provided with a through limit hole. The limit hole is provided with a limit pin vertically embedded in the vertical groove. The limit pin and the limit hole are interference fit. The locking screw is threadedly connected to the side wall of the support tube and embedded in the vertical groove.

7. The flexible fixed support structure for heavy-duty lead screw measurement according to claim 1, characterized in that: The outer wall of the nut is provided with a plurality of insertion holes for inserting the rotating rods along the circumferential direction.

8. The flexible fixed support structure for heavy-duty lead screw measurement according to claim 1, characterized in that: The internal thread of the nut and the external thread of the stud are mutually meshed trapezoidal threads.

9. The flexible fixed support structure for heavy-duty lead screw measurement according to claim 1, characterized in that: The bottom outer wall of the support tube is screwed with a mounting ring, and the mounting ring includes at least two and is evenly distributed along the circumference of the support tube.

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