Threaded lead screw spline rotary lifting device

Abstract

The utility model relates to the technical field of part machining, in particular to a threaded lead screw spline rotary lifting device. The device comprises a threaded screw rod, a threaded nut and a spline nut, wherein the threaded nut and the spline nut are rotationally arranged on the threaded screw rod at the same time; the threaded lead screw comprises a threaded part and vertical groove parts vertically formed in the axial direction, and the vertical groove parts are symmetrically arranged along the threaded lead screw. The threaded nut is matched with the threaded part of the threaded screw rod and rotates along the threaded screw rod; the spline nut comprises a nut body and a nut ball arranged along the inner wall of the nut body, and the nut ball ascends and descends along the vertical groove part or rotates along the threaded part. A ball screw is replaced by the threaded screw, so that the manufacturing cost is reduced, and the small-diameter-size market requirement is met; the lifting of the screw rod is realized through the rotation action of the threaded nut along the threaded screw rod; the spline nut and the threaded nut rotate at the same time, so that the threaded lead screw rotates.

Description

Technical Field

[0001] The utility model relates to the technical field of parts processing, in particular to a threaded screw rod spline rotating lifting device. Background Art

[0002] In the field of mechanical manufacturing, the rotational motion of the threaded screw is utilized to realize the up and down movement of the lifting platform through the cooperation between the thread and the screw sleeve, and it is widely used in various industrial equipment, such as ordinary machine tools, elevators, etc. A new solution is provided to solve the problems existing in the traditional rotary lifting device. For example, the Chinese patent, the authorization announcement number is CN211924830U, which discloses a new type of ball screw ball spline, wherein a spiral first ball groove is provided on the outer periphery of the screw, and a second ball groove is provided along its axial direction. The screw nut and the spline nut are both sleeved on the outer periphery of the screw, and a threaded third ball groove is provided inside the screw nut, and a fourth ball groove extending along its axial direction is provided inside the spline nut. However, this solution is relatively complex, with high processing precision and relatively high manufacturing cost, and cannot meet the market demand for small diameter sizes. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a threaded screw rod spline rotating lifting device.

[0004] The technical solution adopted by the utility model is as follows:

[0005] A threaded screw spline rotary lifting device comprises a threaded screw, and a threaded nut and a spline nut which are rotatably arranged on the threaded screw at the same time, wherein:

[0006] The threaded screw comprises a threaded portion and a vertical groove portion vertically opened along the axial direction, and the vertical groove portion is symmetrically arranged along the threaded screw;

[0007] A threaded nut, which cooperates with the threaded portion of the threaded screw and rotates along the threaded screw;

[0008] The spline nut comprises a nut body and a nut ball arranged along the inner wall of the nut body. The nut ball moves up and down along the vertical groove portion, or the nut ball rotates along the threaded portion.

[0009] This technical solution reduces manufacturing costs and adapts to the market demand for small diameter sizes by using a threaded screw instead of a ball screw; it achieves lifting and lowering of the screw by the rotation of the threaded nut along the threaded screw to meet the lifting and lowering requirements in part processing; it achieves rotation of the threaded screw by the simultaneous rotation of the spline nut and the threaded nut, thereby meeting the rotation requirements in part processing. Specifically, the cooperation between the threaded portion of the threaded screw and the threaded nut forms a spiral transmission mechanism; when the threaded screw rotates, due to the spiral shape of the thread, the threaded nut will perform a linear motion along the axial direction of the threaded screw, that is, a rotational motion, and the rotational motion is achieved through the relative rotation between the threaded portion and the threaded nut and the guiding effect of the thread; when the spline nut contacts the vertical groove portion of the threaded screw, the nut ball moves up and down along the vertical groove portion, and since the nut ball rolls along the vertical groove portion instead of sliding, the friction force is relatively small, thereby achieving a smoother and more efficient lifting and lowering motion; the rotational motion of the nut ball along the threaded portion is used to maintain a close fit between the spline nut and the threaded screw to prevent relative sliding between the two; the threaded screw not only cooperates with the threaded nut for lifting and lowering motion, but also guides the lifting and lowering motion of the spline nut through the vertical groove portion; the spline nut achieves precise control of the lifting and lowering motion through the cooperation between the nut ball inside it and the vertical groove portion.

[0010] In addition, the threaded screw spline rotary lifting device proposed in the utility model also has the following additional technical features:

[0011] According to an embodiment of the utility model, the threaded screw is provided with two vertical grooves, and the spline nut is provided with two nut balls.

[0012] This technical solution is used to increase the stability and load-bearing capacity of the device by providing two vertical grooves of the threaded screw and two nut balls of the spline nuts, ensuring the smooth lifting action. According to an embodiment of the utility model, the thread depth of the threaded portion is greater than the diameter of the nut ball, and the spacing distance of the thread is greater than the radius of the ball.

[0013] This technical solution ensures that the thread depth of the threaded portion is greater than the diameter of the nut ball and the spacing between the threads is greater than the radius of the ball, thereby enhancing the tightness of the fit between the thread and the ball and improving the accuracy and stability of the lifting action.

[0014] According to an embodiment of the present invention, the diameter of the nut ball is smaller than the width of the vertical groove portion, and the diameter of the nut ball is greater than the depth of the vertical groove portion.

[0015] This technical solution controls the diameter of the nut ball to be smaller than the width of the vertical groove portion, and the diameter of the nut ball to be larger than the depth of the vertical groove portion, to ensure that the nut ball can rise and fall freely in the vertical groove portion without falling off, while maintaining sufficient contact area to achieve a smooth lifting action.

[0016] According to an embodiment of the utility model, the nut ball is telescopically arranged in the nut body; the nut ball is in a pop-up state in the vertical groove portion, and the nut ball is in a squeezed state in the threaded portion.

[0017] The technical solution is to design a nut ball that is telescopically arranged in the nut body, and is in a pop-up state in the vertical groove part and in an extruded state in the threaded part, so as to realize flexible conversion of the ball during the lifting process and improve the adaptability and service life of the device.

[0018] According to an embodiment of the utility model, a locking screw is provided on the spline nut for keeping the spline nut at a specified height of the threaded screw.

[0019] This technical solution arranges a locking screw on the spline nut to ensure that the spline nut can stably maintain a specified height of the threaded screw, prevent position displacement due to vibration or external force, and ensure the accuracy and reliability of the lifting action.

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] By using a threaded screw instead of a ball screw, the manufacturing cost is reduced and the market demand for small diameter sizes is met; the screw is lifted and lowered by the rotation of the threaded nut along the threaded screw to meet the lifting and lowering requirements in part processing; the threaded screw is rotated by the simultaneous rotation of the spline nut and the threaded nut, thereby meeting the rotation requirements in part processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the utility model.

[0023] Figure 2 It is a structural diagram of a threaded screw.

[0024] Figure 3 It's a spline nut.

[0025] In the figure: 1, threaded screw; 11, threaded portion; 12, vertical groove portion; 2, threaded nut; 3, spline nut; 31, nut body; 32, nut ball. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] Example 1

[0028] like Figure 1 As shown, this embodiment provides a threaded screw spline rotary lifting device, comprising a threaded screw 1, and a threaded nut 2 and a spline nut 3 that are simultaneously rotatably arranged on the threaded screw 1, wherein:

[0029] like Figure 2 As shown, the threaded screw 1 comprises a threaded portion 11 and a vertical groove portion 12 vertically opened along the axial direction, and the vertical groove portion 12 is symmetrically arranged along the threaded screw 1;

[0030] The threaded nut 2 cooperates with the threaded portion 11 of the threaded screw 1 and rotates along the threaded screw 1;

[0031] like Figure 3 As shown, the spline nut 3 includes a nut body 31 and a nut ball 32 arranged along the inner wall of the nut body 31 . The nut ball 32 moves up and down along the vertical groove portion 12 , or the nut ball 32 rotates along the threaded portion 11 .

[0032] like Figures 1 to 3 As shown, this technical solution uses a threaded screw 1 to replace a ball screw, thereby reducing manufacturing costs and meeting market demand for small diameter sizes; it realizes the lifting and lowering of the screw by the rotation of the threaded nut 2 along the threaded screw 1 to meet the lifting and lowering requirements in part processing; it realizes the rotation of the threaded screw 1 by the simultaneous rotation of the spline nut 3 and the threaded nut 2, thereby meeting the rotation requirements in part processing. Specifically, the threaded portion 11 of the threaded screw 1 cooperates with the threaded nut 2 to form a spiral transmission mechanism; when the threaded screw 1 rotates, due to the spiral shape of the thread, the threaded nut 2 will perform a linear motion along the axial direction of the threaded screw 1, that is, a rotational motion, and the rotational motion is achieved through the relative rotation between the threaded portion 11 and the threaded nut 2 and the guiding effect of the thread; when the spline nut 3 contacts the vertical groove portion 12 of the threaded screw 1, the nut ball 32 moves up and down along the vertical groove portion 12. Since the nut ball 32 rolls along the vertical groove portion 12 instead of sliding, the friction force is relatively small, thereby achieving a smoother and more efficient lifting and lowering motion; the rotational motion of the nut ball 32 along the threaded portion 11 is used to maintain a close fit between the spline nut 3 and the threaded screw 1 to prevent relative sliding between the two; the threaded screw 1 not only cooperates with the threaded nut 2 to perform a lifting and lowering motion, but also guides the lifting and lowering motion of the spline nut 3 through the vertical groove portion 12; the spline nut 3 achieves precise control of the lifting and lowering motion through the cooperation between the nut ball 32 inside it and the vertical groove portion 12.

[0033] In addition, the threaded screw spline rotary lifting device proposed in the utility model also has the following additional technical features:

[0034] According to an embodiment of the present utility model, the threaded screw 1 is provided with two vertical grooves 12 , and the spline nut 3 is provided with two nut balls 32 .

[0035] This technical solution is used to increase the stability and load-bearing capacity of the device and ensure the smooth lifting action by providing two vertical grooves 12 of the threaded screw 1 and two nut balls 32 of the spline nuts 3. According to an embodiment of the utility model, the thread depth of the threaded portion 11 is greater than the diameter of the nut ball 32, and the spacing distance of the threads is greater than the radius of the ball.

[0036] This technical solution ensures that the thread depth of the threaded portion 11 is greater than the diameter of the nut ball 32 and the spacing distance of the thread is greater than the radius of the ball, thereby enhancing the tightness of the fit between the thread and the ball and improving the accuracy and stability of the lifting action.

[0037] According to an embodiment of the present invention, the diameter of the nut ball 32 is smaller than the width of the vertical groove portion 12 , and the diameter of the nut ball 32 is greater than the depth of the vertical groove portion 12 .

[0038] This technical solution controls the diameter of the nut ball 32 to be smaller than the width of the vertical groove 12, and the diameter of the nut ball is larger than the depth of the vertical groove 12, so as to ensure that the nut ball 32 can rise and fall freely in the vertical groove 12 without falling off, while maintaining sufficient contact area to achieve a smooth lifting action.

[0039] According to an embodiment of the present invention, the nut ball 32 is telescopically arranged in the nut body 31 ; the nut ball 32 is in a pop-up state in the vertical groove portion 12 , and the nut ball 32 is in a squeezed state in the threaded portion 11 .

[0040] The technical solution is to design the nut ball 32 to be telescopically arranged in the nut body 31, and to be in a pop-up state in the vertical groove portion 12 and in a squeezed state in the threaded portion 11, so as to realize flexible conversion of the ball during the lifting process and improve the adaptability and service life of the device.

[0041] According to an embodiment of the utility model, a locking screw is provided on the spline nut 3 for keeping the spline nut 3 at a specified height of the threaded screw 1 .

[0042] The technical solution arranges a locking screw on the spline nut 3 to ensure that the spline nut 3 can stably maintain a specified height of the threaded screw 1, prevent position displacement due to vibration or external force, and ensure the accuracy and reliability of the lifting action.

[0043] The usage process of the above embodiment is as follows:

[0044] like Figures 1 to 3As shown, the working process of the threaded nut 2 is as follows: since the threaded screw 1 is provided with both the threaded portion 11 and the vertical groove portion 12, the threaded nut 2 cooperates with the threaded portion 11 and starts to perform a linear motion along the axial direction of the threaded screw 1, that is, a rotational motion;

[0045] like Figures 1 to 3 As shown, the working process of the spline nut 3 is as follows: the spline nut 3 also rotates with the threaded screw 1, and the nut ball 32 inside it rolls in the vertical groove portion 12 to achieve lifting and lowering movement; due to the rolling of the ball, it is relatively smooth and efficient. During the lifting and lowering process, the nut ball 32 remains in a pop-up state in the vertical groove portion 12, ensuring that there is sufficient contact area with the vertical groove portion 12 to achieve smooth lifting and lowering; and when the nut ball 32 moves to the threaded portion 11, due to the thread depth and density design of the threaded portion 11, the ball will be squeezed, but it still maintains a close fit with the threaded portion 11 to prevent sliding, which not only ensures the smoothness of the lifting and lowering, but also improves the stability and carrying capacity of the entire device.

[0046] In addition, since a locking screw is provided on the spline nut 3, it is ensured that the spline nut 3 can stably maintain a specified height of the threaded screw 1 during the lifting process, avoiding position deviation due to vibration or external force.

[0047] During the entire working process, the lifting and rotation requirements in part processing are achieved through the spiral transmission of the threaded portion 11 and the threaded nut 2, the rolling and lifting of the nut ball 32 in the vertical groove portion 12, and the fixing effect of the locking screw. The structure is compact, the manufacturing cost is low, and the adaptability is strong, which meets the needs of the small diameter size market.

[0048] Although the utility model is described in detail by referring to the accompanying drawings and in combination with the preferred embodiments, the utility model is not limited thereto. Without departing from the spirit and essence of the utility model, ordinary technicians in the field can make various equivalent modifications or substitutions to the embodiments of the utility model, and these modifications or substitutions should be within the scope of the utility model / any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the protection scope of the claims.

Claims

1. A threaded screw spline rotary lifting device, characterized in that: It comprises a threaded screw (1), and a threaded nut (2) and a spline nut (3) which are rotatably arranged on the threaded screw (1) at the same time, wherein: The threaded screw (1) comprises a threaded portion (11) and a vertical groove portion (12) vertically opened along the axial direction, wherein the vertical groove portion (12) is symmetrically arranged along the threaded screw (1); A threaded nut (2) cooperates with a threaded portion (11) of the threaded screw (1) and rotates along the threaded screw (1); The spline nut (3) comprises a nut body (31) and a nut ball (32) arranged along the inner wall of the nut body (31); the nut ball (32) moves up and down along the vertical groove portion (12), or the nut ball (32) rotates along the threaded portion (11).

2. The threaded screw spline rotary lifting device according to claim 1, characterized in that: The threaded screw (1) is provided with two vertical grooves (12), and the spline nut (3) is provided with two nut balls (32).

3. The threaded screw spline rotary lifting device according to claim 1 or 2, characterized in that: The thread depth of the threaded portion (11) is greater than the diameter of the nut ball (32), and the spacing distance of the threads is greater than the radius of the ball.

4. The threaded screw spline rotary lifting device according to claim 3, characterized in that: The diameter of the nut ball (32) is smaller than the width of the vertical groove portion (12), and the diameter of the nut ball (32) is greater than the depth of the vertical groove portion (12).

5. The threaded screw spline rotary lifting device according to claim 1 or 4, characterized in that: The nut ball (32) is telescopically arranged in the nut body (31); the nut ball (32) is in a pop-up state in the vertical groove portion (12), and the nut ball (32) is in a squeezed state in the threaded portion (11).

6. The threaded screw spline rotary lifting device according to claim 5, characterized in that: The spline nut (3) is provided with a locking screw for keeping the spline nut (3) at a specified height of the threaded screw (1).

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