Ball screw transmission connecting device and measuring machine

Abstract

The utility model provides a ball screw transmission connecting device and a measuring machine, the ball screw transmission connecting device comprises a lead screw, a nut, a cross sliding table and a movable table connecting seat, the cross sliding table comprises a first sliding table seat, a middle sliding table seat and a second sliding table seat, a first cross roller guide rail is arranged between the first sliding table seat and the middle sliding table seat, and a second cross roller guide rail is arranged between the second sliding table seat and the middle sliding table seat. A second crossed roller guide rail is arranged between the middle sliding table seat and the second sliding table seat, and the second sliding table seat is fixedly connected with the nut; two guide rails of the first crossed roller guide rail are respectively connected to the first sliding table seat and the middle sliding table seat; two guide rails of the second crossed roller guide rail are respectively connected to the middle sliding table seat and the second sliding table seat; and the movable table connecting seat is fixedly connected with the first sliding table seat. According to the utility model, the adverse effect of deflection deformation or radial swing of the lead screw on the moving part can be weakened or even offset, and the stability of the lead screw in the transmission process and the moving stability of the moving part are ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical equipment, and particularly relates to a structural improvement of a ball screw transmission connection device and a measuring machine with the device. Background Art

[0002] The three-dimensional coordinate measuring machine with ball screw drive can realize the high-speed and accurate positioning of the moving parts of the measuring machine.

[0003] Ball screws have very high requirements for assembly, and are generally installed with both ends fixed and supported by bearings. The screw will have deflection due to gravity and other factors, which will affect the transmission accuracy.

[0004] For ball screws with large strokes, the screw can be pre-stretched to reduce the impact of deflection; or the stiffness of the screw can be increased by selecting a ball screw with a large diameter, but the existence of deflection cannot be eliminated.

[0005] During the movement of the measuring machine, since the moving parts moved by the screw and nut are usually rigidly connected to the nut, the deflection and radial swing of the screw will cause the moving parts to deform, thereby affecting the compensation data of the measuring machine.

[0006] Moreover, the deflection and radial swing of the lead screw will also cause "stress" in the moving parts, causing internal stress in the moving parts of the measuring machine. The stress will be gradually released during the use of the measuring machine, resulting in deviation in the laser compensation data and adversely affecting the accuracy of the measuring machine. Summary of the invention

[0007] The utility model provides a ball screw transmission connection device and a measuring machine, which can reduce the influence of the deflection and radial swing of the screw on the measuring accuracy of the measuring machine.

[0008] In order to solve the above technical problems, the technical solution adopted by the ball screw transmission connection device proposed in the utility model is a ball screw transmission connection device, comprising:

[0009] A lead screw, which is arranged horizontally;

[0010] A nut, which cooperates with the lead screw and drives the nut to move axially along the lead screw when the lead screw rotates;

[0011] A cross slide, comprising a first slide seat, an intermediate slide seat and a second slide seat, wherein a first cross roller guide is provided between the first slide seat and the intermediate slide seat, a second cross roller guide is provided between the intermediate slide seat and the second slide seat, and the second slide seat is fixedly connected to the nut; two guide rails of the first cross roller guide are respectively connected to the first slide seat and the intermediate slide seat; two guide rails of the second cross roller guide are respectively connected to the intermediate slide seat and the second slide seat; an extension direction of the first cross roller guide and an extension direction of the second cross roller guide are perpendicular to each other, and are both perpendicular to the axial direction of the lead screw;

[0012] The movable platform connecting seat is fixedly connected to the first sliding platform seat.

[0013] The first slide seat, the middle slide seat and the second slide seat are respectively provided with a through portion, and the through portions of the three are coaxially arranged and respectively sleeved on the lead screw, and there is a gap of 1-2mm between the through portion and the lead screw, and the through portion is coaxially arranged with the lead screw and the nut.

[0014] The number of the first cross roller guide rails is two, and the two first cross roller guide rails are arranged in parallel and symmetrically relative to the axis of the through portion;

[0015] The number of the second cross roller guides is two, and the two second cross roller guides are arranged in parallel and symmetrically relative to the axis of the through portion.

[0016] A flange portion is formed on one end of the nut, and the flange portion has an annular positioning protrusion coaxial with the nut. The second slide seat and the nut are fixedly connected via a slide connecting seat arranged therebetween. The second slide seat is fixedly connected to the slide connecting seat, and the slide connecting seat is fixedly connected to the flange connecting portion. A positioning groove is formed on the slide connecting seat to cooperate with the annular positioning protrusion.

[0017] The slide connection seat is annular or U-shaped, and the positioning groove is formed on the inner wall of the slide connection seat.

[0018] The movable table connecting seat includes a first connecting portion and a second connecting portion, the first connecting portion is fixedly connected to the first sliding table seat, the second connecting portion is fixedly connected to the first connecting portion, and the second connecting portion has a horizontal mounting surface parallel to the lead screw.

[0019] The first cross roller guide is a vertical guide, and the second cross roller guide is a horizontal guide.

[0020] The utility model also proposes a measuring machine, including a workbench, a measuring mechanism and a measuring platform. The workbench is provided with a ball screw transmission connection device, and the ball screw transmission connection device is the above-mentioned ball screw transmission connection device. The two ends of the screw are respectively installed on the workbench through bearing seats, and the measuring platform is installed on the moving table connecting seat.

[0021] Compared with the prior art, the utility model has the following advantages and positive effects:

[0022] The utility model ball screw transmission connection device comprises a screw, a nut, a cross slide and a movable table connection seat, the cross slide comprises a first slide seat, an intermediate slide seat and a second slide seat, a first cross roller guide is arranged between the first slide seat and the intermediate slide seat, a second cross roller guide is arranged between the intermediate slide seat and the second slide seat, and the second slide seat is fixedly connected to the nut; the two guide rails of the first cross roller guide are respectively connected to the first slide seat and the intermediate slide seat; the two guide rails of the second cross roller guide are respectively connected to the intermediate slide seat and the second slide seat; the extension direction of the first cross roller guide and the extension direction of the second cross roller guide are perpendicular to each other and are both perpendicular to the axial direction of the screw; the movable table connection seat is fixedly connected to the first slide seat.

[0023] Since the cross slide is a layered structure, cross roller guides are arranged between adjacent layers, and the extension direction of the first cross roller guide and the extension direction of the second cross roller guide are perpendicular to each other, and both are perpendicular to the axial direction of the lead screw, the movable table connecting seat can slide relative to the nut in two directions perpendicular to each other, and these two directions are also perpendicular to the axial direction of the lead screw, that is, the movement direction of the nut. When a moving part is installed on the movable table connecting seat, the moving part and the lead screw are connected in a flexible transmission manner, thereby reducing or even offsetting the adverse effects of the lead screw deflection deformation or radial swing on the moving part, effectively preventing the moving part from being deformed or preventing the moving part from being subjected to "strange force", thereby ensuring the stability of the lead screw transmission process and the smooth movement of the moving part.

[0024] In a measuring machine using the ball screw transmission connection device of the utility model, the measuring platform is installed on the moving table connecting seat, and the measuring platform is the moving component. The ball screw transmission connection device of the utility model can weaken or even offset the adverse effects of the deflection deformation or radial swing of the screw on the measuring platform, ensure the stability of the screw transmission process and the smooth movement of the measuring platform, thereby improving the measuring accuracy of the measuring machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 This is a schematic diagram of the three-dimensional structure of the ball screw transmission connection device in the embodiment of the utility model;

[0027] Figure 2 It is a three-dimensional structural diagram of a ball screw transmission connection device from one perspective after omitting the lead screw and the bearing seat in the embodiment of the utility model;

[0028] Figure 3 It is a three-dimensional structural diagram of another perspective of the ball screw transmission connection device after omitting the lead screw and the bearing seat in the embodiment of the utility model;

[0029] Figure 4 This is a schematic diagram of the nut structure in the embodiment of the utility model;

[0030] Figure 5 It is a schematic diagram of the connection structure between the cross slide and the slide connecting seat in the embodiment of the utility model;

[0031] Figure 6 This is a schematic diagram of the three-dimensional structure of the cross slide in the embodiment of the utility model;

[0032] Figure 7 The schematic diagram of the partial decomposition structure of the cross slide in the embodiment of the utility model is shown in FIG. Figure 1 ;

[0033] Figure 8 The schematic diagram of the partial decomposition structure of the cross slide in the embodiment of the utility model is shown in FIG. Figure 2 .

[0034] : Reference numerals: 100, lead screw; 200, nut; 210, flange; 220, annular positioning protrusion; 300, cross slide; 310, first slide seat; 320, intermediate slide seat; 330, second slide seat; 340, first cross roller guide; 350, second cross roller guide; 360, through portion; 370, slide connecting seat; 371, positioning groove; 400, movable table connecting seat; 410, first connecting portion; 420, second connecting portion; 421, horizontal mounting surface; 500, bearing seat. DETAILED DESCRIPTION

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection 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.

[0036] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0037] Reference Figures 1 to 8 In some embodiments of the present invention, a ball screw transmission connection device is proposed, including a screw 100, a nut 200, a cross slide 300 and a movable table connecting seat 400.

[0038] Among them, the screw 100 and the nut 200 are existing ball screw structures. The screw 100 is horizontally arranged, and its two ends are rotatably connected to the bearing seat 500, and one end extends out of the bearing seat 500 to connect to the output end of the driving component (such as a motor), so that the screw 100 can rotate under the drive of the driving component.

[0039] The nut 200 cooperates with the lead screw 100 , and the nut 200 is configured to only move along the axial direction of the lead screw 100 when the lead screw 100 rotates.

[0040] The cross slide 300 includes a first slide seat 310, an intermediate slide seat 320 and a second slide seat 330 which are arranged in sequence, a first cross roller guide 340 is provided between the first slide seat 310 and the intermediate slide seat 320, a second cross roller guide 350 is provided between the intermediate slide seat 320 and the second slide seat 330, and the second slide seat 330 is fixedly connected to the nut 200; the two guide rails of the first cross roller guide 340 are respectively connected to the first slide seat 310 and the intermediate slide seat 320; the two guide rails of the second cross roller guide 350 are respectively connected to the intermediate slide seat 320 and the second slide seat 330; the extension direction of the first cross roller guide 340 and the extension direction of the second cross roller guide 350 are perpendicular to each other, and are both perpendicular to the axial direction of the screw 100.

[0041] The movable table connecting seat 400 is fixedly connected to the first sliding table seat 310. The movable table connecting seat 400 is used to connect a movable component that needs to move linearly under the transmission of a ball screw transmission connection device, such as a measuring platform of a measuring machine. When the screw 100 rotates, the movable table connecting seat 400 can be driven by the nut 200 to move axially along the screw 100, thereby realizing the axial movement of the movable component such as the measuring platform along the screw 100. The workpiece to be measured is placed on the measuring platform to realize the movement of the workpiece for measurement.

[0042] Since the first cross roller guide 340 between the first slide seat 310 and the middle slide seat 320 in the cross slide 300, and the second cross roller guide 350 between the middle slide seat 320 and the second slide seat 330, extend in directions perpendicular to each other and perpendicular to the axial direction of the screw 100, for example, the first cross roller guide 340 is a vertical guide, and the second cross roller guide 350 is a horizontal guide. Therefore, the movable table connecting seat 400 is connected to the screw 100 and the nut 200 through two sets of cross roller guide structures in different directions. The cross roller guides of the two can slide freely in two different radial directions of the screw 100, so that the movable table connecting seat 400 can slide freely in two different radial directions of the screw 100 relative to the screw 100, thereby realizing that the moving parts, such as the measuring platform of the measuring machine, can slide freely in two different radial directions of the screw 100 relative to the screw 100, and realizing the flexible transmission connection between the moving parts and the screw 100, thereby reducing or even offsetting the adverse effects of the deflection deformation or radial swing of the screw 100 on the moving parts, effectively preventing the moving parts from being deformed or preventing the movement of the moving parts from being "strange", ensuring the stability of the transmission process of the screw 100 and the smooth movement of the moving parts, thereby improving the measurement accuracy of the measuring machine.

[0043] In some embodiments of the utility model, avoidance portions 380 are respectively provided on the first slide seat 310, the middle slide seat 320, and the third slide seat 330 to avoid the installation of the first cross roller guide 340 and the second screw drive 350, and to make the first slide seat 310, the middle slide seat 320, and the second slide seat 330 fit as closely as possible, and the first cross roller guide 340 and the second screw drive 350 are hidden inside, so that the relative sliding of the first slide seat 310 and the middle slide seat 320 is smoother and more reliable, and the relative sliding of the middle slide seat 320 and the second slide seat 330 is smoother and more reliable.

[0044] In some embodiments of the present invention, Figures 1 to 8As shown, a through portion 360 is respectively provided on the first slide seat 310, the middle slide seat 320 and the second slide seat 330. The through portions 360 of the three are coaxially arranged and respectively sleeved on the lead screw 100. There is a gap of 1-2 mm between the through portion 360 and the lead screw 100. The through portion 360 is coaxially arranged with the lead screw 100 and the nut 200.

[0045] In addition to the deflection caused by the gravity of the screw 100 itself and the centrifugal bending deformation caused by rotation, the screw 100 may also have other irregular deformations, such as irregular deformation of the screw 100 caused by ground vibration. By adopting the cross slide 300 of the above structure, the cross slide 300 can be integrally mounted on the screw 100, and there is a gap of 1-2mm between the cross slide 300 and the screw 100. The cross slide 300 can exert a certain restraining effect on the entire circumference of the screw 100, which can weaken or even offset the adverse effects of other irregular deformations of the screw 100 on the moving parts, thereby ensuring the stability of the transmission process of the screw 100 and the smooth movement of the moving parts, thereby improving the measurement accuracy of the measuring machine.

[0046] In some embodiments of the present invention, the first cross roller guide 340 is a vertical guide, and the second cross roller guide 350 is a horizontal guide.

[0047] In some embodiments of the present invention, Figure 7 As shown, there are two first cross roller guides 340, which are arranged in parallel and symmetrically relative to the axis of the through portion 360, so that the two first cross roller guides 340 are symmetrically arranged on both sides of the lead screw 100. Figure 1 and Figure 7 From the perspective shown, two first cross roller guide rails 340 are symmetrically arranged on the left and right sides of the lead screw 100. The two guide rails of each first cross roller guide rail 340 are respectively connected to the first slide seat 310 and the middle slide seat 320. Figure 7 As shown, among the two guide rails of each first cross roller, the guide rail close to the through-portion 360 is connected to the first slide seat 310 by a plurality of screws arranged along its length direction, and the guide rail away from the through-portion 360 is connected to the middle slide seat 320 by a plurality of screws arranged along its length direction.

[0048] In some embodiments of the present invention, Figure 8 As shown, there are two second cross roller guides 350, which are arranged in parallel and symmetrically relative to the axis of the through portion 360, so that the two second cross roller guides 350 are symmetrically arranged on both sides of the lead screw 100. Figure 1 and Figure 8From the perspective shown, two second cross roller guide rails 350 are symmetrically arranged on the upper and lower sides of the lead screw 100. The two guide rails of each second cross roller guide rail 350 are respectively connected to the middle slide seat 320 and the second slide seat 330. Figure 8 As shown, among the two guide rails of each second cross roller, the guide rail close to the through-portion 360 is connected to the middle slide seat 320 by a plurality of screws arranged along its length direction, and the guide rail away from the through-portion 360 is connected to the second slide seat 330 by a plurality of screws arranged along its length direction.

[0049] By providing two first cross roller guides 340 and two second cross roller guides 350, and symmetrically arranging them relative to the screw 100, the first cross roller guides 340 and the second cross roller guides 350 can be evenly arranged in a circumferential circle of the screw 100, thereby facilitating the balanced weakening of the adverse effects of radial deformation of the screw 100 in all directions on the movement of the moving parts, and further improving the stability of the transmission process of the screw 100 and the smooth movement of the moving parts.

[0050] In some embodiments of the utility model, the overall outer contour of the cross slide 300 is a cube, and the through portion 360 is located on its central axis. The screw 100 is inserted into the cross slide 300 along the axial direction of the cross slide 300, so that the transmission of the screw 100 is more balanced and stable.

[0051] like Figures 2 to 5 As shown, a flange portion 210 is formed on one end of the nut 200, and the flange portion 210 has an annular positioning protrusion 220, which is coaxial with the nut 200, and the second slide seat 330 is fixedly connected to the nut 200 via a slide connection seat 370 disposed therebetween. Specifically, the second slide seat 330 is fixedly connected to the slide connection seat 370, and the slide connection seat 370 is fixedly connected to the flange connection portion, and a positioning groove 371 that cooperates with the annular positioning protrusion 220 is formed on the slide connection seat 370.

[0052] On the one hand, by setting a slide connecting seat 370 as an intermediate connecting piece between the second slide seat 330 and the nut 200, the main connecting structure can be set on the slide connecting seat 370, which can reduce the structure on the nut 200 as much as possible, that is, reduce the modification of the structure of the nut 200 to ensure the original structure of the nut 200, thereby ensuring the matching accuracy of the screw 100 and the nut 200.

[0053] On the other hand, the flange part 210 has an annular positioning protrusion 220, and the slide connecting seat 370 is formed with a positioning groove 371 that cooperates with the annular positioning protrusion 220. When the slide connecting seat 370 and the flange part 210 are connected, the annular positioning protrusion 220 and the positioning groove 371 cooperate to play a positioning role to improve the connection efficiency and matching accuracy. The flange part 210 and the slide connecting seat 370 can be connected by multiple screws arranged circumferentially, and the slide connecting seat 370 and the second slide seat 330 are also connected by multiple screws arranged circumferentially.

[0054] The slide connection seat 370 may be annular or U-shaped, and the positioning groove 371 is formed on the inner wall of the slide connection seat 370 .

[0055] The movable table connecting seat 400 includes a first connecting portion 410 and a second connecting portion 420 . The first connecting portion 410 is fixedly connected to the first sliding table seat 310 , and the second connecting portion 420 is fixedly connected to the first connecting portion 410 . The second connecting portion 420 has a horizontal mounting surface 421 parallel to the lead screw 100 .

[0056] Specifically, the movable table connecting seat 400 is an L-shaped plate, the first connecting part 410 is vertically arranged to facilitate the connection with the first sliding table connecting seat 370, the second connecting part 420 is horizontally arranged and is located above the cross slide 300, the sliding table connecting seat 370 and the nut 200, and its horizontal mounting surface 421 ensures the horizontal installation of the moving parts thereon, such as the measuring platform of the measuring machine.

[0057] Furthermore, the first connecting portion 410 is a U-shaped plate with an opening downward, and the first slide seat 310 is approximately rectangular. The first connecting portion 410 spans the first slide seat 310. A group of relative inner walls of the U-shaped plate-shaped first connecting portion 410 are respectively adhered to a group of relative vertical side walls of the first slide seat 310 and connected by screws, so that the first connecting portion 410 is in contact and connected with the first slide seat 310 with a larger area, thereby improving the connection reliability.

[0058] This embodiment also proposes a measuring machine, specifically a three-dimensional coordinate measuring machine, including a workbench, a measuring mechanism and a measuring platform. The workbench is provided with a ball screw transmission connection device, which is transmission-connected with the measuring platform to drive the measuring platform to move along the axial direction of the screw 100, thereby driving the workpiece on the measuring platform to move. The specific structure of the ball screw transmission connection device can be found in the specific embodiment of the ball screw transmission connection device of the utility model and the attached Figures 1 to 8 The description will not be repeated here. The measuring machine adopting the ball screw transmission connection device of the utility model has good stability and high measuring accuracy.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A ball screw transmission connection device, characterized in that: include: A lead screw, which is arranged horizontally; A nut, which cooperates with the lead screw and drives the nut to move axially along the lead screw when the lead screw rotates; A cross slide, comprising a first slide seat, an intermediate slide seat and a second slide seat, wherein a first cross roller guide is provided between the first slide seat and the intermediate slide seat, a second cross roller guide is provided between the intermediate slide seat and the second slide seat, and the second slide seat is fixedly connected to the nut; two guide rails of the first cross roller guide are respectively connected to the first slide seat and the intermediate slide seat; two guide rails of the second cross roller guide are respectively connected to the intermediate slide seat and the second slide seat; an extension direction of the first cross roller guide and an extension direction of the second cross roller guide are perpendicular to each other, and are both perpendicular to the axial direction of the lead screw; The movable platform connecting seat is fixedly connected to the first sliding platform seat.

2. The ball screw transmission connection device according to claim 1, characterized in that: The first slide seat, the middle slide seat and the second slide seat are respectively provided with a through portion, and the through portions of the three are coaxially arranged and respectively sleeved on the lead screw, and there is a gap of 1-2mm between the through portion and the lead screw, and the through portion is coaxially arranged with the lead screw and the nut.

3. The ball screw transmission connection device according to claim 2, characterized in that: The number of the first cross roller guide rails is two, and the two first cross roller guide rails are arranged in parallel and symmetrically relative to the axis of the through portion; The number of the second cross roller guides is two, and the two second cross roller guides are arranged in parallel and symmetrically relative to the axis of the through portion.

4. The ball screw transmission connection device according to claim 2, characterized in that: A flange portion is formed on one end of the nut, and the flange portion has an annular positioning protrusion coaxial with the nut. The second slide seat and the nut are fixedly connected via a slide connecting seat arranged therebetween. The second slide seat is fixedly connected to the slide connecting seat, and the slide connecting seat is fixedly connected to the flange connecting portion. A positioning groove is formed on the slide connecting seat to cooperate with the annular positioning protrusion.

5. The ball screw transmission connection device according to claim 4, characterized in that: The slide connection seat is annular or U-shaped, and the positioning groove is formed on the inner wall of the slide connection seat.

6. The ball screw transmission connection device according to claim 1, characterized in that: The movable table connecting seat includes a first connecting portion and a second connecting portion, the first connecting portion is fixedly connected to the first sliding table seat, the second connecting portion is fixedly connected to the first connecting portion, and the second connecting portion has a horizontal mounting surface parallel to the lead screw.

7. The ball screw transmission connection device according to claim 6, characterized in that: The first cross roller guide is a vertical guide, and the second cross roller guide is a horizontal guide.

8. A measuring machine, comprising a workbench, a measuring mechanism and a measuring platform, wherein a ball screw transmission connection device is provided on the workbench, characterized in that: The ball screw transmission connection device is the ball screw transmission connection device described in any one of claims 1 to 7, both ends of the screw are respectively mounted on the workbench through bearing seats, and the measuring platform is mounted on the moving table connecting seat.

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