1. The utility model provides a backward flow subassembly of ball screw, this ball screw include a screw shaft, a nut seat that encircles this screw shaft, a plurality of can circulate set up the rolling member between this screw shaft and this nut seat with rolling, and one is formed at this nut seat inboard for the rolling member circulates the rolling groove of rolling, this rolling groove has and supplies respectively an outflow section and an inflow section that the rolling member flows out and flows in, its characterized in that: the backflow component comprises a backflow piece, a rotary groove, a mounting groove and a sensing module, wherein the backflow piece is arranged on the nut seat and corresponds to the outflow section and the inflow section, the rotary groove penetrates through the backflow piece, two opposite ends of the rotary groove respectively correspond to the outflow section and the inflow section to enable the rolling piece to rotate, the rotary groove comprises a rotary section and a leading-out section, the rotary section is communicated with the outflow section and rotates around a reference point, the leading-out section is connected with the rotary section and the inflow section, the mounting groove is formed in the backflow piece and is relatively located on the outer side of the rotary section, and the sensing module is arranged in the mounting groove and can output a warning signal when the backflow piece is stressed and deformed and the two opposite sides are stressed.

2. The return flow assembly of a ball screw according to claim 1, wherein: the periphery of the revolving section is arc-shaped, the reference point is used as the center of a circle to define an inner reference arc positioned on the outer side of the periphery of the revolving groove and an outer reference arc positioned on the outer side of the inner reference arc, the mounting groove is positioned between the inner reference arc and the outer reference arc, the periphery of the revolving section is away from the reference point by an outer revolving radius, the radius of the inner reference arc is an inner edge radius larger than the outer revolving radius, the radius of the outer reference arc is an outer edge radius larger than the inner edge radius, the difference between the inner edge radius and the outer revolving radius is a first distance, the difference between the outer edge radius and the inner edge radius is a second distance, the first distance is not less than 1mm, and the second distance is not less than 1 mm.

3. The return flow assembly of a ball screw according to claim 2, wherein: the rolling members are balls, the average diameter of the rolling members is defined as a bead diameter, and the second distance is not less than one half of the bead diameter.

4. The return flow assembly of a ball screw according to claim 2, wherein: the mounting groove extends along a long direction, the long direction is parallel to the surface of the outlet of the backflow piece corresponding to the leading-out section, and the length of the mounting groove along a width direction perpendicular to the long direction is not less than 1 mm.

5. The return flow assembly of a ball screw according to claim 2, wherein: the mounting groove extends along a length direction, the length direction is parallel to a tangent of the periphery of the rotary section, and the length of the mounting groove along a width direction perpendicular to the length direction is not less than 1 mm.

6. The return flow assembly of a ball screw according to claim 2, wherein: the sensing module comprises a force sensor arranged on the backflow piece, the force sensor is arranged on one side of the backflow piece close to the rotation section or one side of the backflow piece far away from the rotation section, and the thickness of the force sensor is not less than 0.1 mm.

7. The return flow assembly of a ball screw according to claim 2, wherein: the sensing module comprises two metal sheets arranged at intervals, the metal sheets are respectively arranged on one side of the backflow piece close to the rotation section and one side of the backflow piece far away from the rotation section, and the thickness of each metal sheet is not less than 0.1 mm.

8. The return flow assembly of a ball screw according to claim 2, wherein: the screw shaft extends along an axis, the nut seat is provided with an end face vertical to the axis and an installation groove formed in the end face and communicated with the outflow section and the inflow section, and the backflow piece is installed in the installation groove.

9. The return flow assembly of a ball screw according to claim 2, wherein: the screw shaft extends along an axis, the nut seat is provided with an end face which is vertical to the axis and is penetrated by the outflow section and the inflow section, the backflow piece comprises an annular plate body arranged on the end face and an extension part which extends into the outflow section from the annular plate body, the rotary groove is formed in the annular body and the extension part, and the rotary section is positioned at the connecting part of the annular body and the extension part.

10. The return flow assembly of a ball screw according to claim 2, wherein: the screw shaft extends along an axis, the nut seat is provided with an outer peripheral surface which surrounds the axis and is penetrated by the outflow section and the inflow section, the backflow piece comprises a central part and two connecting parts, the central part is mounted on the outer peripheral surface, the two connecting parts are respectively connected to two opposite sides of the central part and respectively penetrate the outflow section and the inflow section, the rotary groove is formed in the central part and the connecting parts, and the rotary section is positioned at the connecting part of one connecting part and the central part.

Background

The utility model provides a current circulating ball screw, includes a screw shaft, a screw cap seat of establishing this screw shaft of cover, two sets up respectively in the backward flow end cover of this screw cap seat both ends of being opposite, and a plurality of can in this screw cap seat and the rolling member of circulation flow between the backward flow end cover.

After the ball screw is used for a long time, abrasion is generated, and the rolling piece is further caused to have a problem of unsmooth flowing, so that in the backflow process of the rolling piece passing through the backflow channel of the backflow end cover, the situation of ball extrusion is easily caused due to unsmooth flowing, pressure is applied to the backflow end cover in the backflow channel, once the pressure is overlarge, the backflow end cover made of plastic materials is damaged, the rolling piece flows out, and the screw shaft and the screw nut seat cannot act in a normal mode and need to be stopped for maintenance.

And another circulating ball screw can install a metal safety cover plate on the outer side of the backflow end cover respectively, so that when the backflow end cover is damaged, the rolling parts can not flow out, however, the stroke of the circulating ball screw is shortened due to the adoption of the mode, the working procedures for replacing the backflow end cover are more, and the problem of inconvenient maintenance is caused.

Disclosure of Invention

The invention aims to provide a backflow component of a ball screw with a safety protection effect.

The invention relates to a backflow component of a ball screw, which comprises a screw shaft, a nut seat surrounding the screw shaft, a plurality of rolling members which are arranged between the screw shaft and the nut seat in a circulating and rolling way, and a rolling groove formed on the inner side of the nut seat and used for the rolling members to circulate and roll, wherein the rolling groove is provided with an outflow section and an inflow section which are respectively used for the rolling members to flow out and flow in, and the backflow component is characterized in that: the backflow component comprises a backflow piece, a rotary groove, a mounting groove and a sensing module, wherein the backflow piece is arranged on the nut seat and corresponds to the outflow section and the inflow section, the rotary groove penetrates through the backflow piece, two opposite ends of the rotary groove respectively correspond to the outflow section and the inflow section to enable the rolling piece to rotate, the rotary groove comprises a rotary section and a leading-out section, the rotary section is communicated with the outflow section and rotates around a reference point, the leading-out section is connected with the rotary section and the inflow section, the mounting groove is formed in the backflow piece and is relatively located on the outer side of the rotary section, and the sensing module is arranged in the mounting groove and can output a warning signal when the backflow piece is stressed and deformed and the two opposite sides are stressed.

The invention relates to a backflow component of a ball screw, wherein the periphery of a revolution section is arc-shaped, an inner reference arc positioned at the outer side of the periphery of a revolution groove and an outer reference arc positioned at the outer side of the inner reference arc are defined by taking a reference point as a circle center, the position of an installation groove is between the inner reference arc and the outer reference arc, the periphery of the revolution section is away from the reference point by an outer revolution radius, the radius of the inner reference arc is an inner edge radius larger than the outer revolution radius, the radius of the outer reference arc is an outer edge radius larger than the inner edge radius, the difference between the inner edge radius and the outer revolution radius is a first distance, the difference between the outer edge radius and the inner edge radius is a second distance, the first distance is not smaller than 1mm, and the second distance is not smaller than 1 mm.

According to the backflow component of the ball screw, the rolling members are balls, the average diameter of the rolling members is defined as a ball diameter, and the second distance is not less than one half of the ball diameter.

According to the backflow component of the ball screw, the installation groove extends along a long direction, the long direction is parallel to the surface of the backflow piece corresponding to the outlet of the leading-out section, and the length of the installation groove along a width direction perpendicular to the long direction is not less than 1 mm.

According to the backflow component of the ball screw, the installation groove extends along a long direction, the long direction is parallel to a tangent of the periphery of the rotating section, and the length of the installation groove along a width direction perpendicular to the long direction is not less than 1 mm.

The invention discloses a backflow assembly of a ball screw, wherein a sensing module comprises a force sensor arranged on a backflow piece, the force sensor is arranged on one side of the backflow piece, which is close to a rotation section, or one side of the backflow piece, which is far away from the rotation section, and the thickness of the force sensor is not less than 0.1 mm.

The invention discloses a backflow assembly of a ball screw, which is characterized in that a sensing module comprises two metal sheets arranged at intervals, the metal sheets are respectively arranged on one side of a backflow piece close to a rotation section and one side of the backflow piece far away from the rotation section, and the thickness of each metal sheet is not less than 0.1 mm.

According to the backflow component of the ball screw, the screw shaft extends along an axis, the nut seat is provided with an end face perpendicular to the axis and an installation groove formed in the end face and communicated with the outflow section and the inflow section, and the backflow piece is installed in the installation groove.

The screw shaft of the backflow component of the ball screw extends along an axis, the nut seat is provided with an end face which is vertical to the axis and is penetrated by the outflow section and the inflow section, the backflow component comprises an annular plate body which is arranged on the end face and an extension part which extends into the outflow section from the annular plate body, the rotary groove is formed in the annular body and the extension part, and the rotary section is positioned at the connecting part of the annular body and the extension part.

The screw shaft of the backflow component of the ball screw extends along an axis, the nut seat is provided with an outer peripheral surface which surrounds the axis and is penetrated by the outflow section and the inflow section, the backflow component comprises a central part which is arranged on the outer peripheral surface and two connecting parts which are respectively connected with two opposite sides of the central part and respectively penetrate the outflow section and the inflow section, the rotary groove is formed on the central part and the connecting parts, and the rotary section is positioned at the connecting part of one connecting part and the central part.

The invention has the beneficial effects that: through the arrangement of the backflow piece, the rotary groove, the mounting groove and the sensing module, the backflow piece can output the warning signal when being stressed and deformed, so that the ball screw can stop operating, and the safety protection effect can be achieved.

Drawings

FIG. 1 is a perspective assembly view of a first embodiment of a return assembly for a ball screw according to the present invention;

FIG. 2 is an exploded perspective view of the first embodiment and the ball screw;

FIG. 3 is a fragmentary perspective assembly view of the first embodiment, a screw shaft and a plurality of rolling elements;

FIG. 4 is a schematic diagram of a first implementation of the first embodiment;

FIG. 5 is a schematic diagram of a second implementation of the first embodiment;

FIG. 6 is a perspective assembly view of a second embodiment of the return flow assembly of the ball screw of the present invention and a nut holder;

FIG. 7 is an exploded perspective view of the second embodiment and the nut holder;

FIG. 8 is a schematic view of the second embodiment;

FIG. 9 is a perspective assembly view of a third embodiment of the return flow assembly of the ball screw of the present invention and a nut holder;

FIG. 10 is an exploded perspective view of the third embodiment and the nut holder;

fig. 11 is a schematic view of the third embodiment.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and examples.

For convenience of description, in the following embodiments, like elements are denoted by like reference numerals.

Referring to fig. 1, 2 and 3, the first embodiment of the backflow assembly of the ball screw according to the present invention is applied to the ball screw 9, and the ball screw 9 includes a screw shaft 91 extending along an axis L, a nut seat 92 surrounding the screw shaft 91, a plurality of rolling members 93 rotatably disposed between the screw shaft 91 and the nut seat 92, and a plurality of rolling grooves 94 formed inside the nut seat 92 for the rolling members 93 to rotatably roll. In this embodiment, the rolling members 93 are balls, but in other embodiments, they can be rollers or other equivalent elements.

The nut seat 92 has two opposite end surfaces 921 perpendicular to the axis L, and two mounting grooves 922 formed in the end surfaces 921 respectively, each rolling groove 94 has an outflow section 941 and an inflow section 942, and the outflow section 941 and the inflow section 942 are respectively communicated with the mounting grooves 922 respectively and are used for the rolling elements 93 to flow out and in respectively. In the embodiment, the outflow section 941 is a spiral groove corresponding to the screw shaft 91 inside the nut seat 92, and the inflow section 942 is a through passage extending along the axis L direction around the wall of the nut seat 92.

It should be noted that the ball screw 9 can be provided with different numbers of the rolling grooves 94 according to different types, and each rolling groove 94 can be correspondingly provided with a group of the backflow components, and for convenience of description, only a single number is described below, that is, a single rolling groove 94 and a single backflow component are described.

The backflow component of the ball screw comprises a backflow piece 2, a rotary groove 3, a mounting groove 4 and a sensing module 5.

The backflow element 2 is installed in the installation groove 922 of the nut seat 92 and corresponds to the outflow section 941 and the inflow section 942, in this embodiment, the backflow element 2 is an end plug (end plug), and the configuration of the end plug is the prior art, and will not be described herein again.

Referring to fig. 1, 2 and 4, the revolving chute 3 passes through the backflow component 2 and has two opposite ends respectively corresponding to the outflow section 941 and the inflow section 942 for the rolling component 93 to revolve, the revolving chute 3 includes an introduction section 33, a revolving section 31 and an exit section 32, wherein the introduction section 33 is communicated with the outflow section 941, the exit section 32 is communicated with the inflow section 942, the revolving section 31 revolves around a reference point a and has two ends respectively communicated with the introduction section 33 and the exit section 32, the periphery of the revolving section 31 is arc-shaped and has a center at the reference point a and an outer revolving radius R1 away from the reference point a, a side of the revolving section 31 relatively adjacent to the reference point a and in a concave shape is defined as a concave arc side 311, and a side of the revolving section 31 relatively away from the reference point a and in a convex shape is defined as a convex arc side 312.

The mounting groove 4 is formed on the return member 2 and located outside the turning section 31 of the turning groove 3 with respect to the reference point a, where the outside is the side of the convex arc side 312 opposite to the concave arc side 311, and defines an inner reference arc S1 located outside the periphery of the turning section 31 of the turning groove 3 with respect to the reference point a and an outer reference arc S2 located outside the inner reference arc S1 with respect to the reference point a, and the mounting groove 4 is located between the inner reference arc S1 and the outer reference arc S2.

The radius of the inner reference arc S1 is an inner edge radius R2 that is greater than the outer radius of gyration R1, the radius of the outer reference arc S2 is an outer edge radius R3 that is greater than the inner edge radius R2, the difference between the inner edge radius R2 and the outer radius of gyration R1 is a first distance, the difference between the outer edge radius R3 and the inner edge radius R2 is a second distance, the first distance is not less than 1mm, and the second distance is not less than 1 mm.

More specifically, the average diameter of the rolling elements 93 is defined as a bead diameter, and the second distance is not less than one-half of the bead diameter.

In the first embodiment, the mounting groove 4 extends along a length direction X, the length direction X is parallel to a surface of the backflow member 2 corresponding to the outlet of the guiding-out section 32, and a length of the mounting groove 4 along a width direction Y perpendicular to the length direction X is not less than 1 mm.

Referring to fig. 5, in a second embodiment, the mounting groove 4 extends along the long direction X, the long direction X is parallel to a tangent of the periphery of the rotation section 31, and the length of the mounting groove 4 along the wide direction Y is not less than 1 mm.

Referring to fig. 1, 4 and 5, the sensing module 5 is disposed in the mounting groove 4 and can output a warning signal when the backflow element 2 is deformed by a force and two opposite sides of the sensing module 5 are pressed. In the embodiment, the sensing module 5 includes a force sensor 51 disposed on the reflow element 2, the thickness of the force sensor 51 is not less than 0.1mm, in the first implementation, the force sensor 51 is disposed in the mounting groove 4 and located on a side of the reflow element 2 adjacent to the turning section 31, and in the second implementation, the force sensor 51 is disposed in the mounting groove 4 and located on a side of the reflow element 2 away from the turning section 31. The Force sensor 51 is a Force Sensing Resistor (FSR) in the embodiment, and when an external Force is applied to the Force sensor 51, the Force sensor 51 can output a sensing signal.

In use, the force sensor 51 is electrically connected to a control system (not shown), when the ball screw 9 is operated, the rolling member 93 rolls in the rolling groove 94, and flows out from the outflow portion 941 to the backflow member 2, and then sequentially passes through the leading-in portion 33, the revolving portion 31 and the leading-out portion 32 of the revolving groove 3, and finally flows back into the inflow portion 942.

When the backflow is not smooth, the backflow member 2 is gradually deformed by the rolling member 93 at the position corresponding to the turning section 31, so that the mounting groove 4 is collapsed, and further, one side of the backflow member 2 adjacent to the mounting groove 4 and relatively adjacent to the turning section 31 is relatively close to one side of the backflow member 2 relatively far away from the turning section 31, when one side of the backflow member 2 in the mounting groove 4 is deformed to be pressed against the force sensor 51 arranged at the other side of the backflow member 2 in the mounting groove 4 (or one side of the backflow member 2 in the mounting groove 4 for arranging the force sensor 51 is deformed to make the force sensor 51 touch the other side of the backflow member 2 in the mounting groove 4), the force sensor 51 outputs the warning signal to the control system due to the pressure, and the control system can control the ball screw 9 to stop acting, and send out a warning to notify personnel to perform maintenance or prepare materials in advance, therefore, the damage of the backflow part 2 and the further damage of the ball screw 9 or other materials caused by the sudden pressure damage of the backflow part 2 can be avoided, and the effect of safety protection can be achieved.

It should be noted that, since the backflow member 2 is generally made by plastic injection molding, in order to ensure that the backflow member 2 has a strength that cannot be fractured before the backflow member is pressed to output the warning signal, the first distance is not less than 1mm, and the second distance is not less than 1 mm.

Referring to fig. 6, 7 and 8, the second embodiment of the present invention is similar to the first embodiment, and the difference lies in:

the nut seat 92 has a end surface 921 perpendicular to the axis L and penetrated by the outflow section 941 and the inflow section 942, the backflow component 2' is installed on the end surface 921, in this embodiment, the outflow section 941 is a spiral groove corresponding to the screw shaft 91 inside the nut seat 92, the inflow section 942 is a through channel extending along the axis L direction on the annular wall of the nut seat 92, the backflow component 2' is a backflow cover plate, the backflow component 2' includes an annular plate 21 installed on the end surface 921, and an extension 22 extending from the annular plate 21 into the outflow section 941, the rotation groove 3 is formed on the annular plate 21 and the extension 22, and the rotation section 31 is located at the connection between the annular plate 21 and the extension 22.

The sensing module 5 includes two metal sheets 52 disposed at an interval, the metal sheets 52 are disposed on a side of the reflow part 2 adjacent to the turning section 31 and a side of the reflow part 2 away from the turning section 31, respectively, and a thickness of each metal sheet 52 is not less than 0.1 mm. In the present embodiment, one of the metal plates 52 is electrically connected to the control system, and the other metal plate 52 is electrically connected to a power source (not shown).

When the backflow piece 2' is deformed to enable one side, adjacent to the mounting groove 4 and relatively adjacent to the rotating section 31, to be relatively close to one side, relatively far away from the rotating section 31, of the backflow piece, when one side is deformed to enable the metal sheets 52 to be mutually pressed to form electric connection, the metal sheets 52 are short-circuited and output a warning signal which is substantially the power supply to the control system, and the control system can control the ball screw 9 to stop acting and give a warning to inform personnel to maintain, so that the effect of safety protection can be achieved.

Thus, the second embodiment can also achieve the same objects and advantages as those of the first embodiment described above.

Referring to fig. 9, 10 and 11, the third embodiment of the present invention is similar to the first embodiment, and the difference lies in:

the nut seat 92 has an outer peripheral surface 923 surrounding the axis L and penetrated by the outflow section 941 and the inflow section 942, and the return element 2 ″ is mounted on the outer peripheral surface 923. In this embodiment, the backflow component is of an external circulation specification, the outflow section 941 and the inflow section 942 are respectively located at two ends of a rotary tank 3, the backflow element 2 "is an external backflow pipe, the backflow element 2" includes a central portion 23 installed on the outer peripheral surface 923, and two connecting portions 24 respectively connected to two opposite sides of the central portion 23 and respectively penetrating the outflow section 941 and the inflow section 942, the rotary tank 3 is formed on the central portion 23 and the connecting portions 24, and the rotary section 31 is located at a connection position between one of the connecting portions 24 and the central portion 23.

Thus, the third embodiment can also achieve the same objects and advantages as those of the first embodiment described above.

In summary, by providing the backflow member 2, the rotary groove 3, the mounting groove 4 and the sensing module 5, the warning signal can be outputted when the backflow member 2 is deformed by a force, so that the ball screw 9 can stop operating, and the safety protection effect can be achieved, thereby achieving the purpose of the present invention.