Stroke-controllable planetary roller screw

Abstract

The utility model discloses a stroke-controllable planetary roller screw rod which comprises a middle screw rod (1), and the end part of the middle screw rod (1) is connected with a driving motor (2); the middle screw rod (1) is sleeved with a nut seat (3), and an inner gear ring (16) is arranged between the nut seat (3) and the middle screw rod (1); the inner gear ring (16) is connected with a plurality of pin rollers (4) in a meshed mode, each pin roller (4) is arranged between the nut seat (3) and the middle lead screw (1), and a planet carrier (5) is arranged between the two ends of each pin roller (4). A linear sensor is mounted on the middle screw rod (1) and is electrically connected with the driving motor (2); and the nut seat (3) is provided with an induction piece matched with the linear sensor. The planetary ball screw stroke control device not only can improve the precision of planetary ball screw stroke control, but also has the advantages of being convenient to install, high in structural stability and long in service life.

Description

Technical Field

[0001] The utility model relates to a planetary ball screw, in particular to a planetary roller screw with controllable stroke. Background Art

[0002] A planetary roller screw is a device that converts rotational motion into linear motion. It mainly includes components such as an intermediate screw, a roller body, a gear ring, and a nut seat. Since the movement of the roller body between the gear ring and the intermediate screw is rolling friction, its transmission efficiency is higher than that of an ordinary ball screw. At present, many planetary roller screws are installed with limit switches at both ends to limit the movement of the nut seat at both ends when in use. However, when in use, the control of the movement stroke of the nut seat is not limited to the control of the two ends. In many cases, the specific stroke of the nut seat needs to be controlled. At this time, manual control is often used to manually control the rotation time of the intermediate screw to achieve the purpose of controlling the movement stroke of the nut seat. However, manual control will be affected by various factors, resulting in reduced control accuracy. Therefore, how to design a planetary roller screw with high-precision stroke control has become a problem that needs to be solved urgently. Utility Model Content

[0003] The purpose of the utility model is to provide a planetary roller screw with controllable stroke. The utility model has the advantage of high precision in stroke control of the planetary ball screw.

[0004] The technical solution of the utility model is as follows: a planetary roller screw with controllable stroke comprises an intermediate screw, the end of which is connected to a driving motor; a nut seat is sleeved on the intermediate screw, and an inner gear ring is arranged between the nut seat and the intermediate screw; a plurality of roller bodies are meshingly connected on the inner gear ring, each roller body is arranged between the nut seat and the intermediate screw, and a planet carrier is arranged between the two ends of all the roller bodies; a linear sensor is installed on the intermediate screw, and the linear sensor is electrically connected to the driving motor; a sensing piece matched with the linear sensor is arranged on the nut seat; a linear sensor is arranged on the intermediate screw, and the sensing piece matched with the sensing piece arranged on the nut seat makes it possible that when the driving motor drives the intermediate screw to rotate, the roller body can convert the circular motion of the intermediate screw into linear motion, so that the nut seat can move horizontally, and when the nut seat moves, the sensing piece and the linear sensor will generate induction, so that the distance moved by the nut seat can be automatically detected, so that the stroke of the nut seat can be accurately detected and controlled in real time, so that the stroke of the entire planetary ball screw can be accurately controlled.

[0005] In the aforementioned stroke-controllable planetary roller screw, the linear sensor is a grating scale and the sensing component is a reading head; setting the linear sensor as a grating scale and the sensing component as a reading head not only simplifies the overall structure, but also has little limitation on the installation position, thus facilitating assembly.

[0006] In the aforementioned stroke-controllable planetary roller screw, a slide rail is arranged directly below the intermediate screw rod, and a slide groove for installing the grating scale is provided on the top surface of the slide rail; a sliding seat is slidably installed on the slide rail, and the top surface of the sliding seat is fixedly installed on the nut seat; a slide groove matching the slide rail is provided on the bottom surface of the sliding seat, and a mounting groove for installing a reading head is provided on the inner top surface of the slide groove; the arrangement of the auxiliary seat and the connecting seat can support the intermediate screw rod, thereby improving the stability of the entire structure.

[0007] In the aforementioned stroke-controllable planetary roller screw, a connecting seat located directly below the intermediate screw rod is installed on the bottom surface of the drive motor; the slide rail is installed on the top surface of the connecting seat; an auxiliary seat is vertically installed on the end of the connecting seat away from the drive motor, and the auxiliary seat is provided with a through hole for passing the intermediate screw rod.

[0008] In the aforementioned stroke-controllable planetary roller screw, the linear sensor is a magnetostrictive displacement sensor; the magnetostrictive displacement sensor includes a sensitive element and a movable magnetic ring, and the movable magnetic ring is arranged on the induction part; the magnetostrictive displacement sensor adopts a non-contact detection method, which can reduce the wear of the magnetostrictive displacement sensor during use and extend its service life.

[0009] In the aforementioned stroke-controllable planetary roller screw, an installation channel is provided in the middle of the intermediate screw, a waveguide is provided in the installation channel, and one end of the waveguide is connected to an electronic chamber; the sensitive element is arranged in the waveguide; and a mounting ring groove for installing a movable magnetic ring is provided in the nut seat.

[0010] In the aforementioned stroke-controllable planetary roller screw, the surface of the roller body is provided with an external thread that cooperates with the intermediate screw rod, and gear teeth are installed on both ends of the roller body; two internal gear rings are provided, and an internal thread section that cooperates with the external thread is provided at the position corresponding to the position between the two internal gear rings on the inner side wall of the nut seat.

[0011] Compared with the prior art, the utility model improves the prior art by providing a linear sensor on the intermediate screw, which cooperates with the induction piece provided on the nut seat, so that when the driving motor drives the intermediate screw to rotate, the roller body can convert the circular motion of the intermediate screw into linear motion, so that the nut seat can move horizontally, and when the nut seat moves, the induction piece and the linear sensor will generate induction, so that the distance moved by the nut seat can be automatically detected, so that the stroke of the nut seat can be accurately detected and controlled in real time, so that the stroke of the entire planetary ball screw can be accurately controlled. In addition, the utility model also sets the linear sensor as a grating ruler and the induction element as a reading head, which not only makes the overall structure simple, but also has little limitation on the installation position, and is convenient for assembly; by setting the slide rail and the sliding seat for installing the grating ruler and the reading head, it is not only convenient for assembly, but also can guide and support the movement of the nut seat, ensuring the stability of the structure; and the setting of the auxiliary seat and the connecting seat can support the intermediate screw rod, improving the stability of the entire structure; by setting the linear sensor as a magnetostrictive displacement sensor, the magnetostrictive displacement sensor adopts a non-contact detection method, which can reduce the wear of the magnetostrictive displacement sensor during use and extend the service life. Therefore, the utility model can not only improve the accuracy of the stroke control of the planetary ball screw, but also has the advantages of easy installation, high structural stability and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0013] Figure 2 It is a schematic diagram of the internal structure of Embodiment 1 of the present utility model;

[0014] Figure 3 It is a structural schematic diagram of Embodiment 2 of the present utility model;

[0015] Figure 4 It is a side view of embodiment 2 of the utility model;

[0016] Figure 5 yes Figure 3 A partial enlarged view of point A in the middle.

[0017] The markings in the accompanying drawings are: 1-intermediate screw, 2-drive motor, 3-nut seat, 4-roller body, 5-planetary carrier, 6-grating scale, 7-reading head, 8-slide rail, 9-sliding seat, 10-connecting seat, 11-auxiliary seat, 12-sensitive element, 13-movable magnetic ring, 14-waveguide tube, 15-gear teeth, 16-inner gear ring. DETAILED DESCRIPTION

[0018] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0019] Embodiment. A planetary roller screw with controllable stroke is constructed as follows Figures 1 to 5 As shown, it includes an intermediate screw rod 1, and the end of the intermediate screw rod 1 is connected to a driving motor 2; a nut seat 3 is sleeved on the intermediate screw rod 1, and an inner gear ring 16 is arranged between the nut seat 3 and the intermediate screw rod 1; a plurality of roller bodies 4 are meshingly connected to the inner gear ring 16, and each roller body 4 is arranged between the nut seat 3 and the intermediate screw rod 1, and a planet carrier 5 is arranged between the two ends of all the roller bodies 4; a linear sensor is installed on the intermediate screw rod 1, and the linear sensor is electrically connected to the driving motor 2; a sensing element matching the linear sensor is arranged on the nut seat 3.

[0020] The linear sensor is a grating ruler 6, and the inductive component is a reading head 7; a slide rail 8 is arranged directly below the intermediate screw rod 1, and a slide groove for installing the grating ruler 6 is arranged on the top surface of the slide rail 8; a sliding seat 9 is slidably installed on the slide rail 8, and the top surface of the sliding seat 9 is fixedly installed on the nut seat 3; a slide groove matching the slide rail 8 is arranged on the bottom surface of the sliding seat 9, and a mounting groove for installing the reading head 7 is arranged on the inner top surface of the slide groove; a connecting seat 10 located directly below the intermediate screw rod 1 is installed on the bottom surface of the driving motor 2; the slide rail 8 is installed on the top surface of the connecting seat 10; an auxiliary seat 11 is vertically installed on the end of the connecting seat 10 away from the driving motor 2, and the auxiliary seat 11 is provided with a through hole for passing the intermediate screw rod 1; the linear The magnetostrictive sensor is a magnetostrictive displacement sensor; the magnetostrictive displacement sensor includes a sensitive element 12 and a movable magnetic ring 13, and the movable magnetic ring 13 is arranged on the induction element; an installation channel is provided in the middle of the intermediate screw rod 1, and a waveguide tube 14 is provided in the installation channel, and one end of the waveguide tube 14 is connected to an electronic chamber; the sensitive element 12 is arranged in the waveguide tube 14; a mounting ring groove for installing the movable magnetic ring 13 is provided in the nut seat 3; an external thread matching with the intermediate screw rod 1 is provided on the surface of the roller body 4, and gear teeth 15 are installed at both ends of the roller body 4; two internal gear rings 16 are provided, and an internal thread section matching with the external thread is provided at a position corresponding to the position between the two internal gear rings 16 on the inner side wall of the nut seat 3.

[0021] Working principle: When working, first install the entire planetary roller screw on the specific device, then connect it to the external safe mains, and then control the drive motor 2 to start. After the drive motor 2 is started, it will drive the intermediate screw 1 to rotate. After the intermediate screw 1 rotates, a threaded transmission will be generated between it and the roller body 4, so that the roller body 4 will rotate on its own. Because a threaded transmission will also be generated between the roller body 4 and the inner wall of the nut seat 3, the roller body 4 will rotate while also revolving around the intermediate screw 1. Because the end of the roller body 4 is rotatably installed on the planetary carrier 5, and the end of the roller body 4 is provided with gear teeth 15, which cooperates with the inner gear ring 16 provided on the nut seat 3, the nut seat 3 can be translated along the intermediate screw 1; and in the process of the translation of the nut seat 3, the sensing element on the nut seat 3 will be inductively sensed by the linear sensor on the intermediate screw 1, so that the distance moved by the nut seat 3 can be detected in real time, so as to facilitate the user to accurately control the stroke of the nut seat 3; when the linear sensor adopts a grating ruler 6, When the sensing element adopts a reading head 7, when the nut seat 3 performs a translational motion along the intermediate screw rod 1, the nut seat 3 will drive the sliding seat 9 to slide on the slide rail 8, so that the reading head 7 and the grating scale 6 can perform reading work; and when the linear sensor adopts a magnetostrictive displacement sensor and the sensing element adopts an active magnetic ring 13, an external power supply is used to power the electronic chamber, thereby generating a current pulse and transmitting it in the waveguide 14, thereby generating a circular magnetic field on the outside of the waveguide 14 (i.e., a circular magnetic field is formed around the intermediate screw rod 1), and when the nut seat 3 performs a translational motion on the intermediate screw rod 1, the magnetic field generated on the active magnetic ring 13 on the nut seat 3 will intersect with the circular magnetic field around the waveguide; because the sensitive element 12 in the waveguide 14 is made of special magnetostrictive material, under the action of magnetostriction, a strain mechanical wave pulse signal will be generated in the waveguide 14, and the signal will be transmitted to the electronic chamber of the sensor, thereby being able to detect the movement stroke of the nut seat 3.

Claims

1. Planetary roller screw with controllable stroke, characterized by: The invention comprises an intermediate screw rod (1), the end of which is connected to a driving motor (2); a nut seat (3) is sleeved on the intermediate screw rod (1), and an inner gear ring (16) is arranged between the nut seat (3) and the intermediate screw rod (1); a plurality of roller bodies (4) are meshingly connected on the inner gear ring (16), each roller body (4) is arranged between the nut seat (3) and the intermediate screw rod (1), and a planet carrier (5) is arranged between the two ends of all the roller bodies (4); a linear sensor is installed on the intermediate screw rod (1), and the linear sensor is electrically connected to the driving motor (2); and a sensing element matching the linear sensor is arranged on the nut seat (3).

2. The stroke-controllable planetary roller screw according to claim 1, characterized in that: The linear sensor is a grating ruler (6), and the inductive component is a reading head (7).

3. The stroke-controllable planetary roller screw according to claim 2, characterized in that: A slide rail (8) is arranged directly below the intermediate screw rod (1), and a slide groove for mounting a grating ruler (6) is arranged on the top surface of the slide rail (8); a slide seat (9) is slidably mounted on the slide rail (8), and the top surface of the slide seat (9) is fixedly mounted on the nut seat (3); a slide groove matching the slide rail (8) is arranged on the bottom surface of the slide seat (9), and a mounting groove for mounting a reading head (7) is arranged on the inner top surface of the slide groove.

4. The stroke-controllable planetary roller screw according to claim 3, characterized in that: A connecting seat (10) located directly below the intermediate screw rod (1) is installed on the bottom surface of the driving motor (2); the slide rail (8) is installed on the top surface of the connecting seat (10); an auxiliary seat (11) is vertically installed on the end of the connecting seat (10) away from the driving motor (2), and the auxiliary seat (11) is provided with a through hole for passing the intermediate screw rod (1).

5. The stroke-controllable planetary roller screw according to claim 1, characterized in that: The linear sensor is a magnetostrictive displacement sensor; the magnetostrictive displacement sensor comprises a sensitive element (12) and a movable magnetic ring (13); the movable magnetic ring (13) is arranged on the induction element.

6. The stroke-controllable planetary roller screw according to claim 5, characterized in that: A mounting channel is provided in the middle of the intermediate screw rod (1), a waveguide tube (14) is provided in the mounting channel, and one end of the waveguide tube (14) is connected to an electronic chamber; the sensitive element (12) is arranged in the waveguide tube (14); and a mounting ring groove for mounting a movable magnetic ring (13) is provided in the nut seat (3).

7. The stroke-controllable planetary roller screw according to any one of claims 1 to 6, characterized in that: The surface of the roller body (4) is provided with an external thread that matches the intermediate screw rod (1), and gear teeth (15) are installed on both ends of the roller body (4); two internal gear rings (16) are provided, and an internal thread section that matches the external thread is provided on the inner side wall of the nut seat (3) at a position corresponding to the position between the two internal gear rings (16).

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