Lead screw transmission mechanism capable of converting one-way linear motion into reciprocating linear motion

Abstract

The utility model provides a lead screw transmission mechanism capable of converting one-way linear motion into reciprocating linear motion. The lead screw transmission mechanism comprises a lead screw and a threaded sliding block. Two sections of threads are arranged on the screw rod, one section of threads is a single-head linear thread section, and the other section of threads is a double-head reciprocating linear motion thread section with opposite screwing directions; the threaded sliding block is arranged on the lead screw, and the threaded sliding block is provided with a single-head thread matched with the lead screw; when the lead screw rotates forwards, the threaded sliding block conducts linear motion from the single-head linear threaded section to the double-head reciprocating linear motion thread and conducts reciprocating linear motion on the double-head reciprocating linear motion thread section. When the lead screw rotates reversely, the threaded sliding block does linear motion from the double-end reciprocating linear motion threaded section to the single-end linear motion threaded section and continues to do linear motion.

Description

Technical Field

[0001] The utility model relates to a transmission mechanism, in particular to a screw transmission mechanism. Background Art

[0002] Screw drives are widely used as a mechanism for converting rotation into linear motion. In general, when the screw rotates counterclockwise, the slider moves linearly along the screw axis; when the screw rotates clockwise, the slider moves linearly in the opposite direction along the screw axis.

[0003] The double-ended screw can achieve the same direction of rotation of the screw, which can make the slider move back and forth along the screw axis. For example, this reciprocating screw transmission mechanism is common on many winders.

[0004] There are only two types of screw drive mechanisms: the forward and reverse motion of the screw realizes the reciprocating linear motion of the slider. The double helical screw with opposite rotation directions can achieve reciprocating linear motion of the slider when the screw only rotates in one direction.

[0005] In the existing technology, patent publication CN118423417A proposes a reverse-circulating roller screw drive mechanism that uses a compact structure to achieve reverse circulation of a ball screw. However, this design is complex and cannot achieve unidirectional and reciprocating motion cycles using a simple mechanism. Patent publication CN214999195U discloses a forward and reverse screw drive module that achieves forward and reverse motion of the screw through module coordination. Although this module has high control precision, stable working performance, and high transmission efficiency, it still has problems such as difficult processing, complex structure, and high coordination requirements. Utility Model Content

[0006] The main technical problem to be solved by the present invention is to provide a screw transmission mechanism that converts unidirectional linear motion into reciprocating linear motion. The screw transmission is used to vibrate the slider at one end of the linear motion, without the need for an additional vibration mechanism, thereby achieving the required vibration processing. At the same time, the slider can move within the entire length of the screw.

[0007] In order to solve the above technical problems, the utility model provides a screw transmission mechanism for converting unidirectional linear motion into reciprocating linear motion, comprising a screw rod and a threaded slider;

[0008] The screw rod is provided with two sections of threads, one of which is a single-start linear thread section, and the other is a double-start reciprocating linear motion thread section with opposite rotation directions;

[0009] The threaded slider is arranged on the screw rod, and the threaded slider is provided with a single-start thread that matches the screw rod; when the screw rod rotates forward, the threaded slider performs linear motion from the single-start linear thread segment to the double-start reciprocating linear motion thread, and performs reciprocating linear motion in the double-start reciprocating linear motion thread segment; when the screw rod is reversed, the threaded slider performs linear motion from the double-start reciprocating linear motion thread segment to the single-start linear thread segment and continues to perform linear motion.

[0010] In a preferred embodiment, the single-start linear thread segment and the first thread segment in the double-start reciprocating linear motion thread segment form a continuous spiral line.

[0011] In a preferred embodiment, the second thread section in the double-start reciprocating linear motion thread section is shorter than the first thread section and terminates when it intersects with the continuous spiral line.

[0012] Compared with the existing technology, the technical solution of the utility model has the following beneficial effects:

[0013] The utility model provides a screw transmission mechanism for converting unidirectional linear motion into reciprocating linear motion. The screw has both a single-ended linear thread section and a double-ended reciprocating linear motion thread section, combining the functions of a single-ended screw with the characteristics of a double-ended screw. In addition to fulfilling the common functions of both screws, it also provides a special function of combining the two. Furthermore, the utility model successfully transforms the vibration of the double-ended screw end, a drawback of linear transmission, into an irreplaceable advantage. The screw can achieve the reciprocating motion and vibration required within a certain displacement range during forward rotation, while achieving the linear motion required within the entire displacement range of the screw during reverse rotation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the screw transmission mechanism in the preferred embodiment of the present invention. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0016] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0017] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connection" can be a wall-mounted connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or an indirect connection through an intermediate medium. It can be the internal connection 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.

[0018] refer to Figure 1 , this embodiment provides a screw transmission mechanism for converting unidirectional linear motion into reciprocating linear motion, including a screw rod 2 and a threaded slider 3;

[0019] The screw rod 2 is provided with two sections of threads, one of which is a single-start linear thread section 4, and the other is a double-start reciprocating linear motion thread section 6 with opposite rotation directions;

[0020] The threaded slider 3 is arranged on the screw rod 2, and the threaded slider 3 is provided with a single-start thread that matches the screw rod 2; when the screw rod 2 rotates forward, the threaded slider 3 moves linearly from the single-start linear thread segment 4 to the double-start reciprocating linear motion thread, and performs reciprocating linear motion in the double-start reciprocating linear motion thread segment 6; when the screw rod 2 is reversed, the threaded slider 3 moves linearly from the double-start reciprocating linear motion thread segment 6 to the single-start linear thread segment 4 and continues to perform linear motion.

[0021] When the above-mentioned transmission mechanism is in operation, assuming that the counterclockwise direction is forward rotation when viewed from left to right along the axis, the slider first moves linearly from left to right along the single-start helix line in the figure, smoothly enters the double-start helix line segment, and continues to rotate counterclockwise until it reaches the double-start helix connection point 7 at the right end. The direction of rotation of the lead screw is still counterclockwise, but the slider begins to move linearly from right to left, and then begins to move linearly to the right at the left end point of the double-start helix, and so on, until the lead screw begins to rotate clockwise. When the lead screw is reversed (clockwise when viewed from left to right along the axis), the slider moves linearly to the left end point of the double-start helix and no longer returns to move linearly to the right, but continues to move to the left, entering the single-start helix segment and moving linearly until the lead screw changes its rotation direction again.

[0022] In this embodiment, the single-start linear thread segment 4 and the first thread segment of the double-start reciprocating linear motion thread segment 6 form a continuous spiral line. The second thread segment of the double-start reciprocating linear motion thread segment 6 is shorter than the first thread segment. When it intersects with the continuous spiral line, Figure 1 The number 4 in the table is the cutoff number.

[0023] The screw drive mechanism for converting unidirectional linear motion to reciprocating linear motion comprises a screw having both a single-start linear thread segment 4 and a double-start reciprocating linear thread segment 6. This combines the functions of a single-start screw with the characteristics of a double-start screw, achieving not only the common functions of both screws but also the unique function of combining the two. Furthermore, the mechanism successfully transforms the vibration of the double-start screw's ends, a drawback in linear transmission, into an irreplaceable advantage, achieving the reciprocating motion and vibration required within a certain displacement range during forward rotation, while also achieving linear motion within the entire displacement range during reverse rotation.

[0024] The processing of the above-mentioned screw transmission mechanism for converting unidirectional linear motion to reciprocating linear motion includes the following steps:

[0025] Step 1. Use cylindrical steel to machine the shaft and shoulder at both ends, such as Figure 1 As shown in 1.

[0026] Step 2. Process a single-start linear thread segment 4 along the entire length of the lead screw. This single-start linear thread segment 4 includes a section of the double-start reciprocating linear motion thread segment 6.

[0027] Step 3. Process a spiral groove with a spiral rotation direction opposite to that of the single-start linear thread segment 4 in step 2. Except for the opposite rotation direction, other features are exactly the same as those of the single-start spiral groove processed in step 2.

[0028] Step 4. Install the slider into the screw and the screw mechanism is installed.

[0029] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any technical equivalent transformation made using the contents of the present invention specification falls within the protection scope of the present invention.

Claims

1. A screw transmission mechanism for converting unidirectional linear motion to reciprocating linear motion, characterized in that: Including screw rod and threaded slider; The screw rod is provided with two sections of threads, one of which is a single-start linear thread section, and the other is a double-start reciprocating linear motion thread section with opposite rotation directions; The threaded slider is arranged on the screw rod, and the threaded slider is provided with a single-start thread that matches the screw rod; when the screw rod rotates forward, the threaded slider performs linear motion from the single-start linear thread segment to the double-start reciprocating linear motion thread, and performs reciprocating linear motion in the double-start reciprocating linear motion thread segment; when the screw rod is reversed, the threaded slider performs linear motion from the double-start reciprocating linear motion thread segment to the single-start linear thread segment and continues to perform linear motion.

2. The screw transmission mechanism for converting unidirectional linear motion to reciprocating linear motion according to claim 1, characterized in that: The single-start linear thread segment and the first thread segment in the double-start reciprocating linear motion thread segment form a continuous spiral line.

3. The screw transmission mechanism for converting unidirectional linear motion to reciprocating linear motion according to claim 2, characterized in that: The second thread section in the double-start reciprocating linear motion thread section is shorter than the first thread section and is terminated when it intersects with the continuous spiral line.

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