Trailer for measuring stroke of lead screw

Abstract

The utility model relates to the technical field of mechanical equipment, and discloses a trailer for measuring the stroke of a lead screw, which comprises an inverted U-shaped trailer body, rails corresponding to guide rails of a lathe bed are respectively arranged on two sides of the bottom of the trailer body, the cross section of each rail is inverted L-shaped, and the rails comprise vertical rails and horizontal transverse rails. Air floating block sets are arranged between the vertical rail and the lathe bed guide rail and between the transverse rail and the lathe bed guide rail respectively, each air floating block set comprises at least two air floating blocks, limiting pieces hinged to the corresponding air floating blocks are arranged on the vertical rail and the transverse rail respectively, exhaust hole sets are formed in the sides, close to the lathe bed guide rail, of the air floating blocks, and air inlet holes communicated with an air pump are formed in the side portions of the air floating blocks. The air inlet is communicated with the exhaust hole set. The track of the trailer moves without friction with the bed guide rail through the air floating block group, the bed guide rail is long in service life, the trailer is flexible and stable in movement and high in precision, the precision of lead screw stroke measurement is improved, and the measurement cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical equipment, and in particular relates to a trolley for measuring the stroke of a lead screw. Background Art

[0002] The dynamic stroke measurement of the lead screw is mainly used for factory inspection of the lead screw and quality control in the production process. This measurement uses a thread (helix) measuring instrument. The helix is ​​composed of rotary motion and linear motion. The lead screw is both the measured element and the driving element. The measurement process is that the lead screw is screwed to the nut, and the lead screw is driven by the motor to rotate. Relying on the nut clamped on the trailer, the trailer is driven to make continuous linear motion on the bed rail to complete the measurement of the lead screw.

[0003] The existing trailers for measuring the screw stroke are linear motion pairs, mostly using sliding motion or rolling motion, and some use air floating motion. The sliding motion has high friction, the bed rails are easy to wear, the trailer is heavy to move, and it is driven by a mother screw, which has a complex structure and is difficult to control synchronously with the mother screw and the measured screw. Although the rolling motion has low friction, it is difficult to adjust the accuracy. The structure of the trailer with air floating motion is mostly cantilever type, which cannot load the nut clamp. The load change is easy to produce overturning torque, causing the measuring trailer to overturn. The stability of the trailer movement is poor and the accuracy is low, which cannot meet the requirements of the accuracy of the screw pair stroke measurement. Utility Model Content

[0004] The utility model provides a trolley for measuring the screw stroke. The trolley track moves frictionlessly with the bed guide rail through an air floating block group. The bed guide rail has a long service life. The trolley moves flexibly, smoothly and accurately, thereby improving the accuracy of the screw stroke measurement and reducing the measurement cost.

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

[0006] A trailer for measuring the stroke of a screw comprises a trailer body, the trailer body is in an inverted U shape, tracks corresponding to the bed guide rails are respectively arranged on both sides of the bottom of the trailer body, the cross section of the track is in an inverted L shape, the track comprises a vertical rail and a horizontal rail, an air floating block group is respectively arranged between the vertical rail and the bed guide rail and between the horizontal rail and the bed guide rail, each group of the air floating block group comprises at least two air floating blocks, the vertical rail and the horizontal rail are respectively provided with a limiter hinged to the corresponding air floating block, an exhaust hole group is provided on the side of the air floating block close to the bed guide rail, an air inlet hole connected to an air pump is provided on the side of the air floating block, and the air inlet hole is connected to the exhaust hole group.

[0007] The above-mentioned trailer for measuring the screw stroke, wherein the limit member includes a screw and a ball head, the ball head is fixedly connected to one end of the screw, the axis of the screw passes through the center of the ball head, the other end of the screw is provided with an internal angle wrench groove, the screw is threadedly connected to the vertical rail or the horizontal rail, the screw is perpendicular to the surface of the vertical rail or the horizontal rail, the end of the screw away from the ball head is threadedly connected to the locking nut, and the surface of the air float block away from the exhaust hole group is provided with a ball socket adapted to the ball head.

[0008] In the above-mentioned screw stroke measuring trolley, the ball socket is arranged in the center of the air floating block, the ball socket is a spherical crown surface opening outward, the ball head is concentric with the ball socket, and the ball socket can rotate concentrically relative to the ball head.

[0009] In the above-mentioned trailer for measuring the screw stroke, the two tracks are symmetrically distributed along the central plane of the trailer body and are perpendicular to the plane where the trailer body is located.

[0010] In the above-mentioned trailer for measuring the screw stroke, the vertical rail air floating block group and the horizontal rail air floating block group on the track are symmetrically arranged relative to the central plane of the trailer body.

[0011] The above-mentioned screw stroke measurement trailer, wherein each group of the air floating block group includes two air floating blocks, the two air floating blocks on the vertical rail are symmetrically distributed along the center of the vertical rail length, and the two air floating blocks on the transverse rail are symmetrically distributed along the center of the transverse rail length.

[0012] In the above-mentioned screw stroke measuring trolley, a surface of the air float block on one side of the exhaust hole group is provided with a closed annular groove for air pressure balance, and the closed annular groove is symmetrically arranged relative to the center of the plane where the exhaust hole group is located.

[0013] In the above-mentioned screw stroke measurement trolley, the exhaust hole group includes at least four exhaust holes, and the exhaust holes are all connected to the closed ring groove and are symmetrically distributed relative to the center of the closed ring groove.

[0014] In the above-mentioned trolley for measuring the screw stroke, the air floating block is in the form of a rectangular parallelepiped, and the surface of the air floating block on one side of the exhaust hole group is precisely ground.

[0015] The above-mentioned trailer for measuring the screw stroke, wherein a probe frame is provided on the upper outer side of the two rails, a measuring component for measuring the screw is provided on the probe frame, a spiral clamp is provided at the top center of the trailer body, and a hanging basket type nut clamp corresponding to the spiral clamp is provided on the inner bottom side of the trailer body.

[0016] In summary, the beneficial technical effects of the utility model are:

[0017] The utility model arranges an air flotation block group on the track and adjusts the exhaust air pressure of the exhaust hole group on the air flotation block to generate a gap between the air flotation block and the bed guide rail, thereby effectively solving the problems of load bearing, rigidity and stability of the air flotation system of the air flotation block, ensuring the accuracy of the screw stroke measurement and the flexible and light movement of the trailer.

[0018] By setting the hinge between the limit piece and the air float block, the air float block can adaptively rotate on the ball head of the limit piece under the action of high-pressure gas, and the trailer can move on the bed guide rail without jamming. The air float block group can also play a role in error averaging, thereby improving measurement accuracy and reducing measurement costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the use state of the utility model;

[0020] Figure 2 It is a side view of the utility model;

[0021] Figure 3 yes Figure 2 AA section view without the bed rails;

[0022] Figure 4 It is a structural schematic diagram of the air flotation block of the utility model;

[0023] Figure 5 This is a structural schematic diagram of the air flotation block of the utility model from another perspective;

[0024] Figure 6 It is a structural schematic diagram of the limiter of the utility model.

[0025] As shown in the figure, 1. trailer; 11. trailer body; 12. track; 121. vertical rail; 122. horizontal rail; 2. air float block; 21. exhaust hole; 22. air inlet hole; 23. ball socket; 24. closed ring groove; 3. limiter; 31. screw; 32. ball head; 33. locking nut; 4. probe frame; 5. spiral clamp; 6. bed guide rail. DETAILED DESCRIPTION

[0026] The following is combined with Figure 1-6 The utility model is described in further detail.

[0027] like Figure 1-3As shown, a trailer for measuring the screw stroke, the trailer 1 includes a trailer body 11, the trailer body 11 is in an inverted U shape, and rails 12 corresponding to the bed guide rails 6 are respectively arranged on both sides of the bottom of the trailer body 11, the bed guide rails 6 are made of granite and are ground to a specified accuracy, the cross section of the rail 12 is in an inverted L shape, the rail 12 includes a vertical rail 121 and a horizontal rail 122, between the vertical rail 121 and the bed guide rail 6 and between the horizontal rail 122 and the bed guide rail 6 There are air floating block groups respectively arranged between them, that is, a group of air floating block groups is arranged on the front side of the vertical rail 121 on one track 12, and a group of air floating block groups is arranged on the lower side of the horizontal rail 122; each group of air floating block groups includes at least two air floating blocks 2, and the vertical rail 121 and the horizontal rail 122 are respectively provided with limit members 3 hinged to the corresponding air floating blocks 2, and the air floating blocks 2 are provided with an exhaust hole group on one side close to the bed guide rail 6, and the side of the air floating block 2 is provided with an air inlet hole 22 connected to the air pump, and the air inlet hole 22 is connected to the exhaust hole group.

[0028] like Figure 2 , 4 As shown in , 6, the limit member 3 includes a screw rod 31 and a ball head 32, the ball head 32 is fixedly connected to one end of the screw rod 31, the axis of the screw rod 31 passes through the center of the ball head 32, the other end of the screw rod 31 is provided with an internal angle wrench groove (not shown in the figure), the screw rod 31 is threadedly connected to the vertical rail 121 or the horizontal rail 122, the screw rod 31 is perpendicular to the surface of the vertical rail 121 or the surface of the horizontal rail 122, one end of the screw rod 31 away from the ball head 32 is threadedly connected to the locking nut 33, and the surface of the air floating block 2 away from the exhaust hole group is provided with a ball socket 23 adapted to the ball head 32; the ball socket 23 is arranged in the center of the air floating block 2, the ball socket 23 is a spherical crown surface opening outward, the ball head 32 is concentric with the ball socket 23, and the ball socket 23 can rotate concentrically relative to the ball head 32.

[0029] By inserting a wrench into the inner angle wrench slot, the screw rod 31 can be rotated to adjust the distance between the ball head 32 and the surface of the vertical rail 121 or between the ball head and the surface of the horizontal rail 122 to ensure that the gap between the surface of the air float block 2 close to the exhaust hole group and the bed guide rail 6 meets the specified requirements, and then a gasket is sleeved on the screw rod 31 and a locking nut 33 is screwed on to fix the limit member 3.

[0030] The ball head 32 is hingedly matched with the ball socket 23 on the air float block 2. The high-pressure gas discharged from the exhaust hole group of the air float block 2 acts on the bed guide rail 6, so that the air float block 2 can adaptively rotate on the ball head 32 and separate the air float block 2 from the bed guide rail 6. When the lead screw rotates and drives the nut clamped on the trailer 1 to make a linear motion, the trailer 1 and the bed guide rail 6 move without friction, thereby improving the measurement accuracy of the lead screw.

[0031] The two rails 12 are symmetrically distributed along the central plane of the trailer body 11 and are perpendicular to the plane where the trailer body 11 is located.

[0032] In order to ensure the balanced force on the track 12 , the air floating block group of the vertical rail 121 and the air floating block group of the horizontal rail 122 on the track 12 are symmetrically arranged relative to the central plane of the trailer body 11 .

[0033] like Figure 3 As shown, each group of air floating blocks in this embodiment includes two air floating blocks 2, and the two air floating blocks 2 on the vertical rail 121 are symmetrically distributed along the center of the length of the vertical rail 121, and the two air floating blocks 2 on the transverse rail 122 are symmetrically distributed along the center of the length of the transverse rail 122; this arrangement ensures the balance of force on the track 12, and improves the stability of the trailer 1 movement and the measurement accuracy.

[0034] According to the actual length of the track 12 and the required load capacity of the trailer 1, 2-4 air flotation blocks 2 may be provided in each air flotation block group.

[0035] like Figure 3 , 5 As shown, a closed annular groove 24 for air pressure balance is provided on the surface of the air flotation block 2 located on one side of the air outlet group. The closed annular groove 24 is symmetrically arranged relative to the center of the plane where the air outlet group is located.

[0036] The exhaust hole group includes at least four exhaust holes 21 . The exhaust holes 21 are all connected to the closed annular groove 24 and are symmetrically distributed relative to the center of the closed annular groove 24 .

[0037] In this embodiment, four exhaust holes 21 are provided. The four exhaust holes 21 are respectively provided at the top, bottom, left and right of the closed annular groove 24 and are symmetrically distributed relative to the center of the closed annular groove 24 .

[0038] The air flotation block 2 is in the shape of a rectangular parallelepiped, and the surface of the air flotation block 2 on one side of the exhaust hole group is precisely ground.

[0039] A probe frame 4 is provided on the upper outer side of the two rails 12, and a measuring component for measuring the lead screw is provided on the probe frame 4. A spiral clamp 5 is provided in the top center of the trailer body 11, and a hanging basket type nut clamp (not shown in the figure) corresponding to the spiral clamp 5 is provided on the inner bottom side of the trailer body 11.

[0040] When measuring the stroke error of the screw pair, the hanging basket type nut clamp and the spiral clamp 5 clamp the nut threaded on the screw, and the screw rotates to drive the clamped nut to make linear motion, thereby driving the trailer 1 to make synchronous linear motion, and the measuring component on the probe frame 4 realizes the measurement of the stroke error of the screw pair.

[0041] The embodiments of this specific implementation method are all preferred embodiments of the utility model, and are not intended to limit the protection scope of the utility model. Therefore, all equivalent changes made based on the structure, shape, and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A trolley for measuring the travel of a lead screw, comprising a trolley body, characterized in that: The trailer body is in an inverted U shape, and tracks corresponding to the bed guide rails are respectively provided on both sides of the bottom of the trailer body, and the cross-section of the track is in an inverted L shape. The track includes a vertical rail and a horizontal rail, and an air floating block group is respectively provided between the vertical rail and the bed guide rail and between the horizontal rail and the bed guide rail. Each group of the air floating block groups includes at least two air floating blocks, and the vertical rail and the horizontal rail are respectively provided with limit members hinged to the corresponding air floating blocks. An exhaust hole group is provided on the side of the air floating block close to the bed guide rail, and an air inlet hole connected to the air pump is provided on the side of the air floating block, and the air inlet hole is connected to the exhaust hole group.

2. The screw stroke measuring trolley according to claim 1, characterized in that: The limiting member includes a screw and a ball head, the ball head is fixedly connected to one end of the screw, the axis of the screw passes through the center of the ball head, the other end of the screw is provided with an internal angle wrench groove, the screw is threadedly connected to the vertical rail or the horizontal rail, the screw is perpendicular to the surface of the vertical rail or the horizontal rail, the end of the screw away from the ball head is threadedly connected to the locking nut, and the surface of the air float block away from the exhaust hole group is provided with a ball socket adapted to the ball head.

3. The screw stroke measuring trolley according to claim 2, characterized in that: The ball socket is arranged at the center of the air flotation block, the ball socket is a spherical crown surface opening outward, the ball head is concentric with the ball socket, and the ball socket can rotate concentrically relative to the ball head.

4. The screw stroke measuring trolley according to claim 1, characterized in that: The two rails are symmetrically distributed along the central plane of the trailer body and are perpendicular to the plane where the trailer body is located.

5. The screw stroke measuring trolley according to claim 4, characterized in that: The vertical rail air floating block group and the horizontal rail air floating block group on the track are symmetrically arranged relative to the central plane of the trailer body.

6. The screw stroke measuring trolley according to claim 5, characterized in that: Each group of the air floating blocks includes two air floating blocks. The two air floating blocks on the vertical rail are symmetrically distributed along the center of the vertical rail, and the two air floating blocks on the horizontal rail are symmetrically distributed along the center of the horizontal rail.

7. The screw stroke measuring trolley according to claim 1, characterized in that: A closed annular groove for air pressure balance is provided on the surface of the air flotation block on one side of the air outlet group, and the closed annular groove is symmetrically arranged relative to the center of the plane where the air outlet group is located.

8. The screw stroke measuring trolley according to claim 7, characterized in that: The exhaust hole group includes at least four exhaust holes, and the exhaust holes are all connected to the closed annular groove and are symmetrically distributed relative to the center of the closed annular groove.

9. The screw stroke measuring trolley according to claim 1, characterized in that: The air flotation block is in the shape of a rectangular parallelepiped, and the surface of the air flotation block located on one side of the exhaust hole group is precisely ground.

10. The screw stroke measuring trolley according to claim 1, characterized in that: A probe frame is provided on the upper outer side of the two rails, and a measuring assembly for measuring the lead screw is provided on the probe frame. A spiral clamp is provided at the top center of the trailer body, and a hanging basket type nut clamp corresponding to the spiral clamp is provided on the inner bottom side of the trailer body.

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