Electric cylinder and its lead screw bidirectional transmission mechanism and centering method

Abstract

This invention discloses an electric cylinder, its lead screw bidirectional transmission mechanism, and a centering method. The centering method includes the following steps: connecting a first slider to a first lead screw nut and adjusting the first slider into position; using the distance between the positioning centers of the first slider and the lead screw as a reference, rotating the second lead screw nut and adjusting it into position so that after the second slider and the second lead screw nut are connected, the distance between the positioning centers of the second slider and the lead screw is equal to the distance between the positioning centers of the first slider and the lead screw; and pressing and fixing the second lead screw nut onto the second slider using a clamping member. This invention, by changing the connection method between the second slider and the second lead screw nut, achieves high-precision centering and positioning between the first and second sliders, achieving stepless error adjustment. Furthermore, it enables precise positioning of the first and second sliders based on the positioning center, thus meeting the high-precision requirements of large-stroke and high-load applications.

Description

Technical Field

[0001] This invention relates to the field of mechanical transmission technology, and in particular to a two-way lead screw transmission mechanism and its alignment method, as well as an electric cylinder. Background Technology

[0002] The two-way lead screw transmission mechanism mainly uses two different threads machined on a single lead screw, and simultaneously installs a left-hand threaded nut and a right-hand threaded nut to connect the left and right moving parts. The lead screw nut connects the lead screw and the slider. Through the rolling friction of the balls between the lead screw and the slider, the rotational motion of the lead screw is converted into the linear motion of the slider. This converts the rotational motion into the linear motion of the left-hand threaded nut and the right-hand threaded nut moving in opposite directions relative to each other, either approaching or moving away. It is widely used in electric cylinders, grippers, or other similar equipment. However, current two-way lead screw transmission mechanisms are limited by the machining of the lead screw and the connection method between the slider and the lead screw nut, resulting in the drawback of difficulty in accurately positioning the distance between the two sliders. Specifically:

[0003] First, because two different types of threads need to be machined on a single leadscrew, and in general leadscrew and nut drive applications, the leadscrew threads are mostly formed by helical rolling. This machining method makes it impossible to precisely control the distance between the starting points of the left and right threads on a single leadscrew. In other words, the distance between the left and right threads will be controlled within XX±0.5P, where P is the thread pitch and XX is the design distance. In large-stroke applications, the thread pitch is generally 10-20mm.

[0004] Secondly, the lead screw nut and slider are generally connected by a threaded fastener. When adjusting the distance between the two sliders for alignment, the distance is usually adjusted by rotating the assembly formed by the slider and lead screw nut. Although the lead screw nut is a cylinder and can rotate 360°, the slider is not. Therefore, to adjust the distance between the two sliders, a full 360° rotation is required. In other words, the distance the slider adjusts along the axis of the lead screw must be an integer multiple of the screw pitch.

[0005] Therefore, the combination of these two factors ultimately results in a maximum error of 0.5P (i.e., 5mm-10mm) between the most accurate centering distance between the two sliders and the designed centering distance, which cannot meet the requirements for precise centering and positioning (within 1mm). Summary of the Invention

[0006] The purpose of this invention is to provide a two-way lead screw transmission mechanism and its alignment method to solve the technical problem that the current two-way lead screw transmission mechanism is limited by the lead screw processing and the connection method between the slider and the lead nut, resulting in the difficulty in accurately positioning the distance between the two sliders.

[0007] Another objective of this invention is to provide an electric cylinder that solves the technical problem that current bidirectional electric cylinders cannot meet high-precision requirements because the two sliders cannot achieve high-precision centering and positioning.

[0008] The above-mentioned objectives of the present invention can be achieved by the following technical solutions:

[0009] This invention provides a centering method for a two-way lead screw transmission mechanism. The two-way lead screw transmission mechanism includes a lead screw, a first lead screw nut, a second lead screw nut, a first slider, and a second slider. The lead screw has a first thread and a second thread with opposite turning directions. The first lead screw nut is connected to the first thread, and the second lead screw nut is connected to the second thread. The centering method includes the following steps: connecting the first slider to the first lead screw nut and adjusting the first slider into position; using the distance between the positioning centers of the first slider and the lead screw as a reference, rotating the second lead screw nut and adjusting it into position so that after the second slider is connected to the second lead screw nut, the distance between the positioning centers of the second slider and the lead screw is equal to the distance between the positioning centers of the first slider and the lead screw; and pressing and fixing the second lead screw nut onto the second slider using a clamping member.

[0010] In an embodiment of the present invention, the second slider is provided with a central hole and a lead screw mounting groove that are connected to each other. The step of rotating the second lead screw to adjust the second lead screw into position includes: taking the distance between the positioning centers of the first slider and the lead screw as a reference, rotating the second lead screw so that the second lead screw abuts against the bottom surface of the lead screw mounting groove and pushes the second slider to move along the axial direction of the lead screw until the distance between the positioning centers of the second slider and the lead screw is equal to the distance between the positioning centers of the first slider and the lead screw.

[0011] In an embodiment of the present invention, the second slider is further provided with a clamping and limiting groove communicating with the nut mounting groove; the step of clamping and fixing the second nut to the second slider by clamping member includes: installing the clamping member in the clamping and limiting groove, so that the inner edge of the clamping member blocks the groove opening of the nut mounting groove, and connecting the clamping member to the second slider by clamping bolt, so that the inner edge of the clamping member clamps and fixes the second nut to the nut mounting groove.

[0012] In an embodiment of the present invention, connecting the first slider to the first nut and adjusting the first slider to the desired position includes the following steps: connecting the first slider to the first nut via a thread; or pressing and fixing the first nut to the first slider via another clamping member; rotating the lead screw until the first slider is adjusted to the desired position.

[0013] The present invention also provides a two-way lead screw transmission mechanism, including a lead screw, a first lead screw nut, a second lead screw nut, a first slider, and a second slider. The lead screw is provided with a first thread and a second thread with opposite screwing directions. The first lead screw nut is connected to the first thread, the second lead screw nut is connected to the second thread, and the first slider is connected to the first lead screw nut. A clamping member is fixed to one end of the second slider, and the clamping member clamps and fixes the second lead screw nut to the second slider. The lead screw has a positioning center, and the distances between the first slider and the second slider and the positioning center are equal.

[0014] In an embodiment of the present invention, the second slider is provided with a central hole and a nut mounting groove that are connected to each other, the lead screw passes through the central hole, and the second nut is installed in the nut mounting groove.

[0015] In an embodiment of the present invention, the cross-sectional shape of the nut mounting groove is a circular groove structure.

[0016] In an embodiment of the present invention, the second slider is further provided with a pressing and limiting groove communicating with the nut mounting groove. The pressing member is installed in the pressing and limiting groove, and the inner edge of the pressing member blocks the opening of the nut mounting groove and presses and fixes the second nut in the nut mounting groove.

[0017] In an embodiment of the present invention, the cross-sectional shape of the pressing and limiting groove is polygonal, the pressing member is a pressure plate, and the shape of the pressure plate matches the shape of the pressing and limiting groove.

[0018] In an embodiment of the present invention, the clamping member is connected to the second slider via a clamping bolt.

[0019] The present invention also provides an electric cylinder, including the above-mentioned lead screw bidirectional transmission mechanism.

[0020] The features and advantages of this invention are:

[0021] The bidirectional transmission mechanism and its centering method of the present invention, by changing the connection between the second slider and the second lead screw nut, allows the second lead screw nut to be rotated independently for adjustment after the first slider is adjusted into position, using the distance between the first slider and the positioning center as a reference. This ensures that after the second slider is connected to the adjusted second lead screw nut through the clamping member, the distance between the second slider and the positioning center is equal to the distance between the positioning center of the first slider and the lead screw, thereby achieving accurate centering between the second slider and the first slider. Furthermore, this is unaffected by the first and second threads. Therefore, the present invention can achieve high-precision centering and positioning between the first and second sliders, achieving stepless error adjustment. It can also achieve precise positioning of the first and second sliders based on the positioning center, thus meeting the high-precision requirements of large-stroke and high-load applications.

[0022] In the electric cylinder of the present invention, the lead screw rotates under the drive of a motor and drives the first slider connected to the first lead screw nut and the second slider connected to the second lead screw nut to move closer or further away from each other. By setting the above-mentioned bidirectional transmission mechanism, it is ensured that the distance between the first slider and the second slider and the positioning center is the same, thereby achieving precise positioning of the first slider and the second slider based on the positioning center. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a cross-sectional view of the lead screw bidirectional transmission mechanism applied to an electric cylinder in this invention.

[0025] Figure 2 This is a schematic diagram showing the distance between the first slider and the second slider relative to the positioning center in this invention.

[0026] Figure 3 This is a perspective view of the two-way lead screw transmission mechanism applied to an electric cylinder in this invention.

[0027] Figure 4 This is a schematic diagram showing the connection between the first nut and the first slider in this invention.

[0028] Figure 5 This is a schematic diagram showing the connection between the second nut and the second slider in this invention.

[0029] Figure 6 This is a perspective view of the second nut and the second slider in this invention.

[0030] In the picture:

[0031] 1. Lead screw; 101. First thread; 102. Second thread; O. Positioning center; 2. First nut; 3. Second nut; 4. First slider; 401. First nut mounting groove; 402. First center hole; 403. Fastening thread; 5. Second slider; 501. Second nut mounting groove; 502. Clamping limit groove; 503. Second center hole; 6. Clamping component; 61. Through hole; 7. Clamping bolt; 8. Housing; 9. First end cover; 10. Second end cover; 11. Cover plate; 12. Coupling; 13. First bearing component; 14. Second bearing component; 15. Stop bolt. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Implementation Method 1

[0034] like Figure 1 As shown, the present invention provides a two-way lead screw transmission mechanism, including a lead screw 1, a first lead screw nut 2, a second lead screw nut 3, a first slider 4, and a second slider 5. The lead screw 1 is provided with a first thread 101 and a second thread 102 with opposite screwing directions. The first lead screw nut 2 is connected to the first thread 101, the second lead screw nut 3 is connected to the second thread 102, the first slider 4 is connected to the first lead screw nut 2, and a clamping member 6 is fixed to one end of the second slider 5. The clamping member 6 clamps and fixes the second lead screw nut 3 to the second slider 5. The lead screw 1 has a positioning center O, and the distance between the first slider 4 and the second slider 5 and the positioning center O is equal.

[0035] It should be noted that the first slider and the second slider referred to in this invention are not limited to sliders at a specific position. Rather, for ease of description, the slider that is adjusted first during centering is defined as the first slider, and the slider that is adjusted later is defined as the second slider.

[0036] The lead screw bidirectional transmission mechanism of the present invention, by changing the connection method between the second slider 5 and the second lead screw nut 3, enables the alignment of the first slider 4 and the second slider 5 using the following alignment method, specifically including the following steps:

[0037] Connect the first nut 2 to the first slider 4, and adjust the first slider 4 into position;

[0038] Using the distance between the first slider 4 and the positioning center O of the lead screw 1 as a reference, rotate the second lead screw nut 3 and adjust the second lead screw nut 3 into position so that after the second slider 5 and the second lead screw nut 3 are connected, the distance between the second slider 5 and the positioning center O of the lead screw 1 is equal to the distance between the first slider 4 and the positioning center O of the lead screw 1.

[0039] The second nut 3 is pressed and fixed onto the second slider 5 by the clamping member 6.

[0040] Therefore, after the first slider 4 is adjusted to its position, the present invention can adjust the second nut 3 by rotating it independently, based on the distance between the first slider 4 and the positioning center O. This allows the second slider 5 to be connected to the adjusted second nut 3 via the clamping member 6, so that the distance between the second slider 5 and the positioning center O is equal to the distance between the first slider 4 and the positioning center O of the lead screw 1. This achieves accurate alignment between the second slider 5 and the first slider 4. Compared with the prior art, since the present invention can first rotate the second nut 3 at any angle and then use the clamping member 6 to connect the second nut 3 and the second slider 5 into a combination, the distance that the second slider 5 can be adjusted along the axial Z of the lead screw 1 during alignment can be any distance, that is, stepless adjustment can be achieved, and it will not be affected by the first thread 101 and the second thread 102. Therefore, the present invention can achieve high-precision alignment and positioning between the first slider 4 and the second slider 5, achieving the effect of stepless error adjustment. Furthermore, it can achieve accurate positioning of the first slider 4 and the second slider 5 based on the positioning center O, thereby meeting the high-precision requirements of large-stroke and high-load application devices.

[0041] like Figure 2 As shown, the distance between the first slider 4 and the positioning center O can be L1, the distance between the end of the first slider 4 closest to the positioning center O and the positioning center O; the distance between the second slider 4 and the positioning center O can be L2, the distance between the end of the second slider 5 closest to the positioning center O and the positioning center O; or it can be the distance between any two corresponding positions of the first slider 4 and the second slider 5 and the positioning center O. In an embodiment of the present invention, a positioning element is set at a preset distance to determine whether the adjustment is in place. For example, it can be a positioning bolt, the center of which corresponds to the positioning center O, and the diameter of the positioning bolt is equal to the designed centering distance L between the first slider 4 and the second slider 5, that is, the distance L1 between the first slider 4 and the positioning center O plus the distance L2 between the second slider 5 and the positioning center O. The first slider 4 is adjusted along the axial direction Z of the lead screw 1 until the first slider 4 abuts against the positioning bolt, indicating that the adjustment is in place; similarly, the second slider 5 is adjusted along the axial direction Z of the lead screw 1 until the second slider 5 abuts against the positioning bolt, indicating that the adjustment is in place.

[0042] The first slider 4 is adjusted to its starting position, preferably; however, it can be any position within its stroke range, as long as it is ensured that the first slider 4 does not interfere with the second slider 5 which is adjusted subsequently. That is, the entire first slider 4 is always located on the side of the positioning center O closer to the first thread 101, and the entire second slider 5 is always located on the side of the positioning center O closer to the second thread 102, so that there is no interference between the first slider 4 and the second slider 5.

[0043] Combination Figure 1 and Figure 3As shown, the lead screw bidirectional transmission mechanism of the present invention can be applied to an electric cylinder. Specifically, the electric cylinder includes a housing 8, a first end cover 9, a second end cover 10, and a cover plate 11. The lead screw bidirectional transmission mechanism is installed inside the housing 8. The first end cover 9 and the second end cover 10 are installed at both ends of the housing 8. One end of the lead screw 1 is connected to the first end cover 9 through a first bearing member 13 and is connected to the output shaft of the motor through a coupling 12. The other end of the lead screw 1 is connected to the second end cover 10 through a second bearing member 14. The cover plate 11 covers the housing 8 and slides in cooperation with the first slider 4 and the second slider 5 along the axial direction Z of the lead screw 1. The more specific structure of the electric cylinder is the same as that of the prior art and will not be described in detail here. In addition, the lead screw bidirectional transmission mechanism of the present invention can also be applied to grippers or other devices that need to convert rotary motion into bidirectional linear motion.

[0044] like Figure 4 As shown, since the adjusted position of the first slider 4 is not specifically limited, the connection method between the first nut 2 and the first slider 4 is also not specifically limited. For example, in one embodiment of the present invention, the first slider 4 has a communicating first central hole 402 and a first nut mounting groove 401. The lead screw 1 passes through the first central hole 402. The first nut 2 and the second nut mounting groove 401 have matching fastening threads 403. The first nut 2 is installed in the first nut mounting groove 401 and connected by the fastening threads 403. Furthermore, to improve the stability of the connection between the first nut 2 and the first slider 4, the first nut 2 and the first slider 4 are also connected by a stop bolt 15. By rotating the lead screw 1, the first nut 2 drives the first slider 4 to move synchronously along the axial direction Z of the lead screw 1 until the first slider 4 is adjusted to the correct position. In some other embodiments of the present invention, the first nut 2 can also be rotated separately to adjust to the correct position, and then the first slider 4 can be connected to the adjusted first nut 2 by fastening threads or clamping parts.

[0045] like Figure 5 As shown, in an embodiment of the present invention, the second slider 5 is provided with a connected second central hole 503 and a second nut mounting groove 501. The lead screw 1 passes through the second central hole 503, and the second nut 3 is installed in the second nut mounting groove 501. By setting the second nut mounting groove 501, when adjusting the second nut 3 with the distance between the positioning center O of the first slider 4 and the lead screw 1 as a reference, the lead screw 1 is fixed and the second nut 3 is rotated so that the second nut 3 can abut against the bottom surface of the groove of the second nut mounting groove 501, thereby pushing the second slider 5 to move synchronously along the axial direction Z of the lead screw 1 until the distance between the second slider 5 and the positioning center O is equal to the distance between the positioning center O of the first slider 4 and the lead screw 1. That is, when adjusting the second nut 3, it is possible to directly determine whether the adjustment is in place based on the position of the second slider 5, without having to adjust and position the second nut 3 separately based on the relative position of the second nut 3 and the second slider 5 after they are connected.

[0046] Specifically, the cross-sectional shape of the second nut mounting groove 501 is a circular groove structure. When the clamping member 6 is not clamping the second nut 3, the second nut 3 and the second nut mounting groove 501 are rotatably positioned relative to each other in the circumferential direction of the lead screw 1. That is, the rotation of the second nut 3 will not cause the second slider 5 to rotate synchronously, but it can push the second slider 5 to move synchronously along the axial direction Z of the lead screw 1. One end of the second nut 3 located at the opening of the second nut mounting groove 501 is provided with an adjustment hole for inserting an adjustment tool, so that the second nut 3 can be rotated by the adjustment tool.

[0047] like Figure 5 As shown in the embodiment of the present invention, the second slider 5 is further provided with a clamping and limiting groove 502 communicating with the second nut mounting groove 501. The clamping member 6 is installed in the clamping and limiting groove 502, and the inner edge of the clamping member 6 blocks the opening of the second nut mounting groove 501 and clamps and fixes the second nut 3 in the second nut mounting groove 501. By providing the clamping and limiting groove 502, the clamping member 6 can be limited on the one hand, and on the other hand, the clamping member 6 can be prevented from occupying the space at one end of the second slider 5 and affecting the stroke range of the second slider 5.

[0048] Specifically, the clamping member 6 is generally plate-shaped and has a through hole 61. The diameter of the through hole 61 is larger than the diameter of the lead screw 1 but smaller than the diameter of the second lead screw nut 3.

[0049] In an embodiment of the present invention, the clamping member 6 is connected to the second slider 5 via a clamping bolt 7. The clamping member 6 is first pre-assembled into the clamping limiting groove 502 via the clamping bolt 7. After the second screw nut 3 pushes the second slider 5 into position, the clamping bolt 7 is then tightened. A plurality of corresponding threaded holes are evenly arranged on the bottom surface of the clamping limiting groove 502 and on the clamping member 6, with the threaded holes arranged along the axial direction Z of the lead screw 1. The depth of the clamping limiting groove 502 is greater than or equal to the sum of the thickness of the clamping member 6 and the thickness of the head of the clamping bolt 7. Optionally, the clamping member 6 can also be fixed in the clamping limiting groove 502 by other means, such as interference fit, welding, etc.

[0050] like Figure 6 As shown, the cross-sectional shape of the clamping and limiting groove 502 is polygonal, and the clamping member 6 is a pressure plate. The shape of the pressure plate matches the shape of the clamping and limiting groove 502, so that the pressure plate and the clamping and limiting groove 502 cannot rotate relative to each other in the circumferential direction of the lead screw 1. Specifically, the clamping member 6 is generally a square pressure plate, and the four corner parts of the pressure plate are connected to the second slider 5 by four clamping bolts 7.

[0051] Implementation Method 2

[0052] like Figure 1As shown, the present invention also provides a centering method for a two-way lead screw transmission mechanism. The two-way lead screw transmission mechanism includes a lead screw 1, a first lead screw nut 2, a second lead screw nut 3, a first slider 4, and a second slider 5. The lead screw 1 is provided with a first thread 101 and a second thread 102 with opposite screwing directions. The first lead screw nut 2 is connected to the first thread 101, and the second lead screw nut 3 is connected to the second thread 102. The centering method includes the following steps: connecting the first slider 4 to the first lead screw nut 2 and adjusting the first slider 4 into position; using the distance between the first slider 4 and the positioning center O of the lead screw 1 as a reference, rotating the second lead screw nut 3 and adjusting the second lead screw nut 3 into position so that after the second slider 5 is connected to the second lead screw nut 3, the distance between the second slider 5 and the positioning center O of the lead screw 1 is equal to the distance between the first slider 4 and the positioning center O of the lead screw 1; and pressing and fixing the second lead screw nut 3 onto the second slider 5 using a clamping member 6. The centering method of this embodiment can be implemented with reference to Embodiment 1, and will not be described again here.

[0053] like Figure 3 As shown, in an embodiment of the present invention, connecting the first slider 4 to the first nut 2 and adjusting the first slider 4 to the desired position includes the following steps: connecting the first slider 4 to the first nut 2; or pressing and fixing the first nut 2 onto the first slider 4 using another clamping member; that is, the connection method between the first slider 4 and the first nut 2 can be the same as or different from the connection direction between the second nut 3 and the second slider 5; rotating the lead screw 1 until the first slider 4 is adjusted to the desired position.

[0054] like Figure 4 As shown, in an embodiment of the present invention, the second slider 5 is provided with a second central hole 503 and a second nut mounting groove 501 that are connected. The lead screw 1 passes through the second central hole 503, and the second nut 3 is located in the second nut mounting groove 501. Rotating the second nut 3 to adjust the second nut 3 into position includes: taking the distance between the positioning center O of the first slider 4 and the lead screw 1 as a reference, rotating the second nut 3 so that the second nut 3 abuts against the bottom surface of the groove of the second nut mounting groove 501 and pushes the second slider 5 to move along the axial direction Z of the lead screw 1 until the distance between the second slider 5 and the positioning center O of the lead screw 1 is equal to the distance between the positioning center O of the first slider 4 and the lead screw 1.

[0055] like Figure 4 and Figure 5As shown, in an embodiment of the present invention, the second slider 5 is further provided with a pressing and limiting groove 502 that communicates with the second nut mounting groove 501. The second nut 3 is pressed and fixed onto the second slider 5 by the pressing member 6, including: installing the pressing member 6 in the pressing and limiting groove 502, so that the inner edge of the pressing member 6 blocks the groove opening of the nut mounting groove, and connecting the pressing member 6 to the second slider 5 by the pressing bolt 7, so that the inner edge of the pressing member 6 presses and fixes the second nut 3 into the second nut mounting groove 501.

[0056] Implementation Method 3

[0057] like Figure 1 and Figure 3 As shown, the present invention also provides an electric cylinder, including a lead screw bidirectional transmission mechanism. The specific structure, working principle, and beneficial effects of the lead screw bidirectional transmission mechanism in this embodiment are the same as those in Embodiment 1, and will not be repeated here.

[0058] The above descriptions are merely a few embodiments of the present invention. Those skilled in the art can make various modifications or variations to the embodiments of the present invention based on the content disclosed in the application documents without departing from the spirit and scope of the present invention.

Claims

1. A centering method for a two-way lead screw transmission mechanism, characterized in that, The lead screw bidirectional transmission mechanism includes a lead screw (1), a first lead screw nut (2), a second lead screw nut (3), a first slider (4), and a second slider (5). The lead screw (1) is provided with a first thread (101) and a second thread (102) with opposite screwing directions. The first lead screw nut (2) is connected to the first thread (101), and the second lead screw nut (3) is connected to the second thread (102). The centering method includes the following steps: Connect the first slider (4) to the first nut (2) and adjust the first slider (4) into position; Based on the distance between the first slider (4) and the positioning center (O) of the lead screw (1), the lead screw (1) is fixed, and the second lead nut (3) is rotated separately to adjust the second lead nut (3) into place. The second lead nut (3) is pressed and fixed onto the second slider (5) by the clamping member (6). When the clamping member (6) does not press the second lead nut (3), the rotation of the second lead nut (3) will not drive the second slider (5) to rotate synchronously, but it can push the second slider (5) to move synchronously along the axis of the lead screw (1). The distance between the second slider (5) and the positioning center (O) of the lead screw (1) is equal to the distance between the first slider (4) and the positioning center (O) of the lead screw (1).

2. The centering method of the lead screw bidirectional transmission mechanism according to claim 1, characterized in that, The second slider (5) is provided with a central hole (503) and a nut mounting groove (501) that are connected. The step of rotating the second nut (3) to adjust the second nut (3) into position includes: Based on the distance between the first slider (4) and the positioning center (O) of the lead screw (1), rotate the second lead screw nut (3) so that the second lead screw nut (3) abuts against the bottom surface of the lead screw nut mounting groove (501) and pushes the second slider (5) to move along the axial direction of the lead screw (1) until the distance between the second slider (5) and the positioning center (O) of the lead screw (1) is equal to the distance between the first slider (4) and the positioning center (O) of the lead screw (1).

3. The centering method of the lead screw bidirectional transmission mechanism according to claim 2, characterized in that, The second slider (5) is also provided with a clamping and limiting groove (502) communicating with the nut mounting groove (501); the step of clamping and fixing the second nut (3) onto the second slider (5) by the clamping member (6) includes: The clamping member (6) is installed in the clamping limiting groove (502), so that the inner edge of the clamping member (6) blocks the opening of the nut mounting groove (501). The clamping member (6) is connected to the second slider (5) by the clamping bolt (7), so that the inner edge of the clamping member (6) presses and fixes the second nut (3) in the nut mounting groove (501).

4. The centering method of the lead screw bidirectional transmission mechanism according to claim 1, characterized in that, The steps of connecting the first slider (4) to the first nut (2) and adjusting the first slider (4) into position include the following: The first slider (4) is connected to the first nut (2) by a thread; or the first nut (2) is pressed and fixed to the first slider (4) by another clamping member; Rotate the lead screw (1) until the first slider (4) is adjusted into place.

5. A two-way lead screw transmission mechanism, characterized in that, The system includes a lead screw (1), a first lead screw nut (2), a second lead screw nut (3), a first slider (4), and a second slider (5). The lead screw (1) has a first thread (101) and a second thread (102) with opposite turning directions. The first lead screw nut (2) is connected to the first thread (101), the second lead screw nut (3) is connected to the second thread (102), and the first slider (4) is connected to the first lead screw nut (2). A clamping member (6) is fixed to one end of the second slider (5). When the lead screw (1) is fixed, it can be rotated independently. The second screw nut (3) is adjusted to the correct position. The clamping member (6) clamps and fixes the second screw nut (3) onto the second slider (5). When the clamping member (6) does not clamp the second screw nut (3), the rotation of the second screw nut (3) will not drive the second slider (5) to rotate synchronously, but it can push the second slider (5) to move synchronously along the axis of the screw (1). The screw (1) has a positioning center (O). The distance between the first slider (4) and the second slider (5) and the positioning center (O) is equal.

6. The lead screw bidirectional transmission mechanism according to claim 5, characterized in that, The second slider (5) is provided with a central hole (503) and a nut mounting groove (501) that are connected. The lead screw (1) passes through the central hole (503) and the second nut (3) is installed in the nut mounting groove (501).

7. The lead screw bidirectional transmission mechanism according to claim 6, characterized in that, The cross-sectional shape of the nut mounting groove (501) is a circular groove structure.

8. The lead screw bidirectional transmission mechanism according to claim 6, characterized in that, The second slider (5) is also provided with a pressing and limiting groove (502) that communicates with the nut mounting groove (501). The pressing member (6) is installed in the pressing and limiting groove (502). The inner edge of the pressing member (6) blocks the opening of the nut mounting groove (501) and presses and fixes the second nut (3) in the nut mounting groove (501). The pressing member (6) is connected to the second slider (5) by a pressing bolt (7).

9. The lead screw bidirectional transmission mechanism according to claim 8, characterized in that, The cross-sectional shape of the clamping and limiting groove (502) is polygonal, and the clamping member (6) is a pressure plate. The shape of the pressure plate matches the shape of the clamping and limiting groove (502).

10. An electric cylinder, characterized in that, The system includes the bidirectional lead screw transmission mechanism as described in any one of claims 5-9.

Images