Flexibly-connected lead screw nut transmission device and assembling and adjusting method

Abstract

The invention provides a flexibly-connected lead screw nut transmission device and an adjusting method, and solves the problem that the linear motion stability is affected by radial vibration, the lead screw nut transmission device comprises a lead screw nut transmission mechanism, a guide rail mechanism, a motion assembly and a supporting plate; the lead screw nut transmission mechanism is installed on the supporting plate. The guide rail mechanism comprises a guiding guide rail and a motion supporting guide rail. The moving assembly comprises a connecting part and a moving part; the connecting part is connected with the moving part through a movable connecting piece, and the connecting part is flexibly connected with the lead screw nut transmission mechanism. The installation and adjustment method comprises the steps of installation and adjustment of the lead screw nut transmission device, and the adjustment comprises the step of adjusting the detachable connecting piece of the switching supporting flange and the detachable connecting piece of the moving part till the connecting part moves smoothly on the guide rail and the moving speed meets the requirement. On the basis of ensuring the stability of linear motion, the vibration generated by the action of radial force is eliminated, and the stability and the motion precision of the motion part in the motion process are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of screw transmission, and in particular relates to a screw nut transmission device with a flexible connection and an installation and adjustment method. Background Art

[0002] As a commonly used mechanical transmission, the screw-nut transmission can convert the rotational motion of the screw into the linear motion of the nut, so that the nut drives the moving part to move from one position to another along a straight line. The principle of the traditional screw-nut transmission device is: a screw stepper motor is used to drive the screw to rotate and drive the nut to move linearly. One end of the screw is fixedly connected to the output shaft of the screw stepper motor, and the other end of the screw is connected by a bearing support. The nut and the moving part are fixedly connected by screws. The moving part is guided by a linear bearing or a linear guide to ensure the linearity of the moving part during the screw-nut transmission process, and is limited by an electrical touch switch or a mechanical limit pin to prevent over-movement. Since the moving parts and the screw nut in this traditional screw-nut transmission device are rigidly connected in the radial direction, this will cause large internal stress inside the transmission device, resulting in poor movement of the moving parts or even jamming. In addition, due to the influence of various factors such as the screw processing accuracy, the installation parallelism of the screw and the linear guide, the screw nut's own gravity, and the centrifugal force of movement, the moving parts are not only affected by the axial force of the nut during linear motion, but also by the radial force from the nut, which causes radial vibration in the linear motion of the moving parts, seriously reducing the movement stability and accuracy of the moving parts.

[0003] In order to overcome the radial vibration of the moving parts during movement, a ball screw transmission floating nut connection device has been developed in recent years, such as the domestic invention patent with the authorization publication number 107270847A, which discloses a ball screw transmission floating nut connection device and a measuring machine equipped with the device, including a ball screw and a C-type plate, a screw nut matching with the ball screw is installed on the ball screw, a screw nut outer sleeve is provided with an adapter seat, a left joint bearing and a right joint bearing are respectively provided on both sides of the adapter seat, an upper joint bearing is provided on the upper end of the adapter seat, the left joint bearing and the right joint bearing are respectively engaged in the U-shaped grooves at the two ends of the C-type plate, and the upper joint bearing is engaged in the through hole at the upper part of the C-type plate.

[0004] The patent document essentially uses three joint bearings to achieve floating connection between the adapter fixed with the lead screw nut and the C-type plate. The three joint bearings slide up and down in the U-shaped groove and through hole of the C-type plate to achieve gapless transmission of axial freedom and release radial freedom between the lead screw nut and the C-type plate. Although the solution of the patent document can eliminate the influence of radial vibration on the moving parts, thereby improving the movement accuracy of the moving parts, the solution cannot improve the linear motion stability of the moving parts. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art in eliminating the influence of radial vibration on the smoothness of linear motion, and to provide a flexible connected screw nut transmission device and an adjustment method, which can eliminate the vibration caused by radial force on the basis of ensuring the smoothness of linear motion, thereby improving the smoothness and motion accuracy of the moving parts.

[0006] To achieve the above purpose, the technical solution provided by the present invention is:

[0007] In one aspect, the present invention provides a flexibly connected lead screw and nut transmission device, comprising: a lead screw and nut transmission mechanism, a guide rail mechanism, a motion assembly and a support plate; wherein:

[0008] The screw nut transmission mechanism is mounted on the support plate; the guide rail mechanism includes a guide rail and a motion support rail, and the guide rail is arranged in parallel with the motion support rail; the motion assembly includes a connecting component and a motion component, the connecting component is mounted on the guide rail, the motion component is mounted on the motion support rail, and the connecting component is located between the motion component and the screw nut transmission mechanism;

[0009] The connecting component is connected to the moving component via a movable connecting piece, which eliminates the radial force when the screw and nut transmission mechanism is working, thereby preventing the vibration generated by the radial force from being transmitted to the moving component; the connecting component is flexibly connected to the screw and nut transmission mechanism, so that the screw and nut transmission mechanism drives the moving component to move along the guide rail mechanism.

[0010] Based on one aspect, as a further limitation of the present invention, the screw and nut transmission mechanism includes a screw stepper motor, a screw body, a support assembly and a nut assembly, and the support plate includes a motor mounting platform and a bearing mounting platform, wherein:

[0011] The lead screw stepper motor is mounted on the motor mounting platform of the support plate, one end of the lead screw body is fixedly connected to the lead screw stepper motor, the other end of the lead screw body is fixedly connected to the support assembly, and the nut assembly is mounted on the lead screw body and fixedly connected to the connecting component;

[0012] The support assembly includes a support bearing and a support bearing pressure ring, one end of the outer ring of the support bearing is pressed against the end surface of the mounting hole on the bearing support platform of the support plate, and the other end of the outer ring of the support bearing is fixed by the support bearing pressure ring; the inner ring of the support bearing is sleeved on the other end of the screw body;

[0013] The motor mounting platform is arranged in parallel with the bearing mounting platform, and the motor mounting platform, the bearing mounting platform, the support bearing and the support bearing pressure ring jointly ensure that the lead screw body does not vibrate when working.

[0014] Based on one aspect, as a further limitation of the present invention, the screw and nut transmission mechanism includes a screw stepper motor, a screw body and a nut assembly, wherein:

[0015] The lead screw stepper motor is mounted on the support plate, and the output shaft of the lead screw stepper motor is fixedly connected to the lead screw body;

[0016] The nut assembly comprises a T-nut, a nut adapter ring, a first joint bearing, an inner ring pressure ring and an adapter support, the T-nut is mounted on the lead screw body, the nut adapter ring is sleeved on the outer ring of the T-nut and the two are detachably connected;

[0017] The first spherical bearing is mounted on the outer peripheral wall of the nut adapter ring, one end of the inner ring of the first spherical bearing is pressed against the nut adapter ring, and the other end is pressed by the inner ring pressure ring;

[0018] The transition support is installed on the outer ring of the first spherical plain bearing, one end of the outer ring of the first spherical plain bearing is firmly pressed against the inner flange end surface of the transition support, and the other end is pressed by the outer ring pressure ring;

[0019] The transfer support is fixedly connected to the connecting component to realize the fixed connection of two independent parts into one body. The connecting component is fixed on the slider of the guide rail through a detachable connecting piece.

[0020] Based on one aspect, as a further limitation of the present invention, the connecting component and the transfer support are integrally processed into a transfer support flange, the connecting component serves as an extension of the transfer support flange, and the extension moves along the guide rail mechanism when the screw nut transmission mechanism is working;

[0021] The transition support member serves as the main body of the transition support flange, the inner circular surface of the main body contacts the outer ring of the first spherical plain bearing, and the inner flange end surface of the main body contacts the outer ring end surface of the first spherical plain bearing;

[0022] The movable connecting member is a second spherical bearing.

[0023] Based on one aspect, as a further limitation of the present invention, the guide rail mechanism includes a guide rail and a motion support rail, and the support plate includes a guide rail mounting portion, a support rail mounting portion, a plate body and a plurality of reference portions; wherein: the guide rail and the motion support rail are arranged in parallel, the guide rail mounting portion and the support rail mounting portion are both located on the plate body, and the plurality of reference portions are respectively arranged on the side of the guide rail mounting portion and the side of the support rail mounting portion;

[0024] The guide rail is installed on the guide rail installation part and is aligned with the reference surface of the reference part, and the motion support rail is installed on the support rail installation part and is aligned with the reference surface of the reference part;

[0025] The guide rail and the motion support rail are both provided with sliders, and the connecting component and the motion component are respectively connected to the respective sliders.

[0026] Based on one aspect, as a further limitation of the present invention, it further includes a limit assembly, wherein the limit assembly is located between the guide rail and the motion support rail;

[0027] The limiting assembly comprises a limiting pin and a pin sleeve, wherein the limiting pin is fixed to the supporting plate, and the pin sleeve is sleeved on the outer peripheral wall of the limiting pin.

[0028] On the other hand, the present invention provides a method for adjusting a screw nut transmission device. Based on the above-mentioned flexible-connected screw nut transmission device, the method comprises:

[0029] Assemble the nut assembly of the screw nut transmission mechanism; assemble the movable connector and moving parts of the motion assembly;

[0030] Install the guide rail and the limit assembly of the guide rail mechanism on the support plate; continue to install the screw nut transmission mechanism on the support plate; install the motion support rail of the guide rail mechanism on the support plate, and complete the installation of the motion support rail, the motion assembly, and the connecting parts;

[0031] Debug the screw nut transmission device, adjust the detachable connector of the adapter support flange and the detachable connector of the moving part, until the connecting part moves smoothly on the guide rail and the movement speed meets the requirements.

[0032] Based on another aspect, as a further limitation of the present invention, a nut assembly for assembling a lead screw nut transmission mechanism comprises:

[0033] (1) The nut adapter ring is placed on the T-nut of the screw stepper motor so that the flange surface of the nut adapter ring fits the flange surface of the T-nut, and then the nut adapter ring and the T-nut are locked and fixed together with a detachable connector;

[0034] (2) Install the first spherical plain bearing on the nut adapter ring so that one end of the inner ring of the first spherical plain bearing is pressed against the nut adapter ring, and the other end of the inner ring is pressed by the inner ring pressure ring. Then, sleeve the transfer support flange on the outer ring of the first spherical plain bearing so that one end of the outer ring of the first spherical plain bearing is pressed against the inner flange end face of the transfer support flange, and the other end of the outer ring is fixed and pressed by the outer ring pressure ring to tighten the outer ring of the first spherical plain bearing and the transfer support flange, so that the T-nut and the transfer support flange are flexibly connected through the first spherical plain bearing;

[0035] Assemble the movable joints and moving parts of the moving components, including:

[0036] Apply bearing glue to the side shaft of the moving part, install the movable connecting piece on the side shaft of the moving part, and cure it at room temperature for 24 hours to fix the movable connecting piece on the side shaft of the moving part.

[0037] Based on another aspect, as a further limitation of the present invention, the guide rail and the limit assembly of the guide rail mechanism are installed on the support plate, including:

[0038] Place the guide rail on the guide rail installation surface of the support plate so that the side of the guide rail is close to the reference surface of the corresponding reference part, and then fix the position of the guide rail with a detachable connector. Next, install two limit pins in the threaded holes at the corresponding positions of the support plate, and finally put elastic soft pin sleeves on the outer peripheral walls of the limit pins.

[0039] The screw nut transmission mechanism is further installed on the support plate, including:

[0040] First, put the lead screw stepper motor into the corresponding position through the notch on the motor mounting platform of the support plate, and extend the tail of the lead screw of the lead screw stepper motor into the mounting hole of the bearing support platform of the support plate, and use a detachable connector to fix the lead screw stepper motor on the motor mounting platform of the support plate; then, sleeve the support bearing on the tail of the lead screw body of the lead screw stepper motor through the mounting hole on the bearing support platform of the support plate; then, use the support bearing pressure ring to fix the outer ring of the bearing and the bearing support platform of the support plate, so as to realize the tail support of the lead screw stepper motor when the lead screw rotates; finally, fix the protruding part of the adapter support flange to the slider of the guide rail with a detachable connector;

[0041] Install the motion support rail of the guide rail mechanism on the support plate, and complete the installation of the motion support rail, motion components, and connecting parts, including:

[0042] First, install two motion support rails; then insert the side shaft of the motion component fixed with the second joint bearing into the inner hole of the protruding part of the transfer support flange; then use a detachable connecting piece to fix the motion component on the sliders of the two motion support rails, so that the transfer support flange and the motion component are flexibly connected through the second joint bearing.

[0043] Based on another aspect, as a further limitation of the present invention, debugging the screw nut transmission device includes:

[0044] The lead screw stepper motor is driven to rotate, so that the T-nut drives the adapter support flange and the moving parts to reciprocate within the range limited by the guide rail and the axial limit pin;

[0045] Adjust the removable connector of the adapter support flange and the removable connector of the moving part until the connecting part moves smoothly on the guide rail and the movement speed meets the requirements, including:

[0046] If the slider of the guide rail cannot move within the travel range or the speed is lower than the specified speed, first slightly loosen the detachable connectors of the adapter support flange and the moving parts in turn, and then tighten and secure the screws of the adapter support flange and the moving parts until the adapter support flange moves smoothly on the guide rail and the movement speed meets the requirements.

[0047] The advantages of the present invention are:

[0048] 1. The present invention adopts a movable connecting piece (the movable connecting piece is preferably a second joint bearing) to eliminate the radial force of the screw nut transmission mechanism when it is working, and avoids the vibration generated by the radial force from being transmitted to the moving parts; in addition, on the basis of the movable connecting piece realizing the flexible connection between the connecting part and the moving part, the motor mounting table, the bearing mounting table, the support bearing and the support bearing pressure ring jointly ensure that the screw body is free of vibration when working; in addition, the nut assembly of the present invention adopts the first joint bearing to realize the flexible connection between the T-nut and the adapter support flange, which can better release the radial degree of freedom compared with the rigid connection of the prior art, and effectively eliminate the influence of the vibration generated by the radial force of the nut when the screw rotates on the moving parts, so that the moving parts can move on the moving support guide rail without vibration, thereby improving the movement accuracy of the moving parts.

[0049] 2. The present invention adopts three guide rails, one for guiding the movement of the transfer support flange, and two for supporting the movement of the moving parts. The T-nut drives the transfer support flange under the guide support of the guide rail, so that the moving parts supported by the double guide rails can move more smoothly and reliably in the axial direction.

[0050] 3. The present invention only utilizes simple detachable connectors (the detachable connectors are preferably screws), spherical bearings, guide rails, and easily processed nut adapter rings, adapter support flanges and other structural parts to achieve flexible connection between T-nuts and moving parts. Compared with other screw nut transmission devices that use complex structures to eliminate radial vibrations, the flexible screw nut transmission device in the present invention has the advantage of simple structure.

[0051] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0053] Figure 1 : A three-dimensional flexible connection screw nut transmission device provided by the present invention Figure 1 ;

[0054] Figure 2 : A three-dimensional flexible connection screw nut transmission device provided by the present invention Figure 2 ;

[0055] Figure 3 : A cross-sectional view of a flexible-connected lead screw and nut transmission device provided by the present invention;

[0056] Figure 4 : Schematic diagram of the support plate provided by the present invention;

[0057] Figure 5 : A schematic diagram of a transfer support flange provided by the present invention;

[0058] In the figure: 100-screw nut transmission mechanism; 11-screw stepper motor; 12-screw body; 13-support assembly; 131-support bearing; 132-support bearing pressure ring; 14-nut assembly; 141-T-nut; 142-nut adapter ring; 143-first joint bearing; 144-inner ring pressure ring; 145-adaptation support; 145′-adaptation support flange; 1451-inner circular surface; 1452-inner flange end surface; 146-outer ring pressure ring ;200-guide rail mechanism;21-guide rail;22-motion support rail;300-motion component;31-connecting component;32-moving component;321-second joint bearing;400-support plate;41-motor mounting platform;411-notch;42-bearing mounting platform;43-guide rail mounting part;44-support rail mounting part;45-plate body;46-reference part;461-reference surface;500-limiting component;51-limiting pin;52-pin sleeve. DETAILED DESCRIPTION

[0059] Embodiments of the present invention are described in detail below. The embodiments are exemplary and intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0060] See also Figure 1 In order to eliminate radial vibration during the screw-nut transmission process, an embodiment of the present invention provides a screw-nut transmission device with a flexible connection, including: a screw-nut transmission mechanism 100, a guide rail mechanism 200, a motion assembly 300 and a support plate 400; wherein: the screw-nut transmission mechanism 100 is installed on the support plate 400; the guide rail mechanism 200 includes a guide rail 21 and a motion support rail 22, both of which have a slider, and the guide rail 21 is arranged in parallel with the motion support rail 22; the motion assembly 300 includes a connecting component 31 and a motion component 3 2. The connecting component 31 is installed on the guide rail 21, and the moving component 32 is installed on the moving support rail 22. The connecting component 31 is located between the moving component 32 and the screw nut transmission mechanism 100; the connecting component 31 and the moving component 32 are connected by a movable connecting piece, and the movable connecting piece eliminates the radial force of the screw nut transmission mechanism 100 when it is working, and avoids the vibration generated by the radial force from being transmitted to the moving component 32; the connecting component 31 is flexibly connected to the screw nut transmission mechanism 100, so that the screw nut transmission mechanism 100 drives the moving component 300 to move along the guide rail mechanism 200.

[0061] It should be noted that the connecting member 31 and the transfer support member 145 of the embodiment of the present invention can be two independent parts, which are assembled together, or the connecting member 31 and the transfer support member 145 can be designed as one independent part, please refer to Figure 5Specifically, the connecting component 31 and the transfer support 145 are integrally processed into a transfer support flange, and the connecting component 31 serves as an extension of the transfer support flange, and the extension moves along the guide rail mechanism 200 when the screw nut transmission mechanism 100 is working; the transfer support 145 serves as the main body of the transfer support flange, and the inner circular surface 1451 of the main body contacts the outer ring of the first spherical bearing 143, and the inner flange end surface 1452 of the main body contacts the outer ring end surface of the first spherical bearing 143. The transfer support flange of the embodiment of the present invention is sleeved on the outer ring of the first spherical bearing 143, and one end of the outer ring of the first spherical bearing 143 is pressed against the inner flange end surface of the transfer support flange, and the other end is fixedly connected to the transfer support flange through the outer ring pressure ring 146, and the extension of the transfer support flange is fixed to the slider of the guide rail 21 through a detachable connector (the detachable connector is preferably a screw), so that the T-nut 141 and the transfer support flange are flexibly connected through the first spherical bearing 143. The T-nut 141 in the embodiment of the present invention transmits the axial force to the transition support flange without gap, while releasing the radial force transmitted to the transition support flange by the T-nut 141, so that the transition support flange fixed on the slider of the guide rail 21 can move more linearly on the guide rail 21 with higher movement accuracy.

[0062] In the embodiment of the present invention, the side shaft of the moving part 32 fixed with the second joint bearing 321 is inserted into the inner hole of the extension of the transfer support flange, and the inner hole of the extension of the transfer support flange and the outer diameter of the second joint bearing 321 meet the set matching tolerance requirements (preferably using the matching tolerance of H7 / g6). In practical applications, the moving part 32 is preferably fixed to the sliders of the two motion support guide rails 22 by screws. In this way, the transfer support flange and the moving part 32 can be flexibly connected through the second joint bearing 321, which can effectively eliminate the vibration generated by the radial force of the nut when the screw rotates and is transmitted to the moving part 32, so that the transfer support flange drives the moving part 32 to move on the two motion support guide rails 22 without shaking, thereby improving the motion accuracy of the moving part 32.

[0063] See also Figure 3 Furthermore, the above-mentioned movable connecting member of the embodiment of the present invention is preferably a second joint bearing 321. The second joint bearing of the embodiment of the present invention eliminates the radial force of the screw nut transmission mechanism 100 when it is working, and avoids the vibration generated by the radial force from being transmitted to the moving part 32; in addition, please refer to Figure 3 and Figure 4 In the embodiment of the present invention, based on the second joint bearing 321 realizing the flexible connection between the connecting component 31 and the moving component 32, the motor mounting platform 41, the bearing mounting platform 42, the support bearing 131 and the support bearing pressing ring 132 jointly ensure that the screw body 12 does not shake during operation. In addition, please continue to refer to Figure 3The nut assembly 14 of the embodiment of the present invention adopts the first joint bearing 143 to realize a flexible connection between the T-nut 141 and the adapter support flange. Compared with the rigid connection in the prior art, the embodiment of the present invention better releases the radial degree of freedom, effectively eliminates the vibration caused by the radial force of the nut when the screw rotates, and enables the moving part 32 to move on the moving support guide rail 22 without jitter, thereby improving the movement accuracy of the moving part 32.

[0064] In practical applications, the second spherical bearing 321 of the embodiment of the present invention is installed on the side shaft of the moving component 32, and the inner ring of the second spherical bearing 321 and the side shaft of the moving component 32 meet the set matching tolerance requirements (preferably using a matching tolerance of H7 / g6). Preferably, the inner ring of the second spherical bearing 321 and the side shaft of the moving component 32 are fixed by bearing glue.

[0065] See also Figure 2 and Figure 3 Specifically, the screw-nut transmission mechanism 100 of the embodiment of the present invention includes a screw stepper motor 11, a screw body 12, a support assembly 13 and a nut assembly 14, and the support plate 400 includes at least a motor mounting platform 41 and a bearing mounting platform 42, wherein: the screw stepper motor 11 is mounted on the motor mounting platform 41 of the support plate 400, one end of the screw body 12 is fixedly connected to the screw stepper motor 11, the other end of the screw body 12 is fixedly connected to the support assembly 13, and the nut assembly 14 is mounted on the screw body 12 and fixedly connected to the connecting component 31; the support assembly 13 includes a support bearing 131 and a support bearing pressure ring 132, one end of the outer ring of the support bearing 131 is pressed against the end face of the mounting hole on the bearing mounting platform 42 of the support plate 400, and the other end of the outer ring of the support bearing 131 is fixed by the support bearing pressure ring 132; the inner ring of the support bearing 131 is sleeved on the other end of the screw body 12; the motor mounting platform 41 and the bearing mounting platform 42 are arranged in parallel. The embodiment of the present invention uses the motor mounting platform 41, the bearing mounting platform 42, the support bearing 131 and the support bearing pressing ring 132 to jointly ensure that the screw body 12 does not shake during operation.

[0066] In the embodiment of the present invention, a T-nut 141 is installed on the screw body 12, and a nut adapter ring 142 is provided on the outer sleeve of the T-nut 141, so that the outer cylindrical surface of the T-nut 141 and the inner cylindrical surface of the nut adapter ring 142 match to meet the set tolerance requirements, preferably using a matching tolerance of H7 / g6. In order to facilitate disassembly, assembly and debugging, in the embodiment of the present invention, the T-nut 141 and the nut adapter ring 142 are detachably fixed by a detachable connector. Preferably, three fixing threaded holes corresponding to the three identical through holes of the T-nut 141 are provided on the nut adapter ring 142, and the nut adapter ring 142 is fixed to the T-nut 141 by screws. The outer cylindrical surface of the nut adapter ring 142 in the embodiment of the present invention matches with the first joint bearing 143, meeting the set matching tolerance requirements, preferably using a matching tolerance of H7 / g6.

[0067] Please continue reading Figure 2 , Figure 3 and Figure 5 More specifically, the screw stepper motor 11 of the embodiment of the present invention is installed on the support plate 400, and the output shaft of the screw stepper motor 11 is fixedly connected to the screw body 12; the nut assembly 14 of the embodiment of the present invention includes a T-nut 141, a nut adapter ring 142, a first joint bearing 143, an inner ring pressure ring 144 and an adapter support 145, the T-nut 141 is installed on the screw body 12, the nut adapter ring 142 is sleeved on the outer ring of the T-nut 141 and the two are detachably connected; the first joint bearing 143 is installed on the outer peripheral wall of the nut adapter ring 142, and the first joint bearing 143 is installed on the outer peripheral wall of the nut adapter ring 142. One end of the inner ring of the joint bearing 143 is pressed against the nut adapter ring 142, and the other end is pressed by the inner ring pressure ring 144; the transfer support 145 is installed on the outer ring of the first joint bearing 143, and one end of the outer ring of the first joint bearing 143 is pressed against the inner flange end face 1452 of the transfer support 145, and the other end is pressed by the outer ring pressure ring 146; the transfer support 145 is fixedly connected to the connecting component 31, so that two independent parts are fixedly connected as one, and the connecting component 31 is fixed to the slider of the guide rail 21 through a detachable connecting member (the detachable connecting member is preferably a screw). This arrangement allows the screw stepper motor 11 to rotate and drive the T-nut 141 on the screw body 12 to move along the axial direction and transmit it to the connecting component 31 through the first joint bearing 143 without gap, and at the same time, the connecting component 31 is supported and guided by the guide rail 21 to reduce the influence of the radial force of the T-nut 141 on the connecting component 31 when the screw body 12 rotates.

[0068] In practical applications, one end of the inner ring of the first joint bearing 143 of the embodiment of the present invention is pressed against the nut adapter ring 142, and the other end is pressed by the inner ring pressure ring 144. The embodiment of the present invention preferably uses the following method to install the screw stepper motor 11 on the support plate 400: the motor mounting platform 41 of the support plate 400 is provided with four through holes corresponding to the four identical threaded holes of the screw stepper motor 11, and the screw stepper motor 11 is fixed to the motor mounting platform 41 of the support plate 400 by screws. The screw body 12 of the embodiment of the present invention is preferably a screw shaft, and the support bearing 131 is sleeved on the tail of the screw shaft (the support bearing 131 is preferably a deep groove ball bearing), and the outer ring of the support bearing 131 is matched with the mounting hole of the bearing mounting platform 42 to meet the set matching tolerance requirements (preferably using a matching tolerance of H7 / g6).

[0069] In summary, the arrangement of the first joint bearing 143 and the second joint bearing 321 in the embodiment of the present invention can realize the flexible connection of the screw nut transmission device. It can be seen that the embodiment of the present invention adopts two joint bearings to realize the flexible connection between the T-nut 141 and the adapter support flange and the adapter support flange and the moving part 32, which can better release the radial degree of freedom, effectively eliminate the influence of the vibration generated by the radial force of the nut when the screw rotates and transmitted to the moving part 32, so that the moving part 32 moves on the moving support guide rail 22 without shaking, and improves the movement accuracy of the moving part 32.

[0070] Please continue reading Figure 2 and Figure 3 Specifically, the guide rail mechanism 200 of the embodiment of the present invention includes a guide rail 21 and a motion support rail 22, and the support plate 400 includes a guide rail mounting portion 43, a support rail mounting portion 44, a plate body 45 and a plurality of reference portions 46. Among them: the guide rail 21 and the motion support rail 22 are arranged in parallel, the guide rail mounting portion 43 and the support rail mounting portion 44 are both located at the plate body 45, and the plurality of reference portions 46 are respectively arranged on the side of the guide rail mounting portion 43 and the side of the support rail mounting portion 44; the guide rail 21 is installed on the guide rail mounting portion 43 and is aligned with the reference surface 461 of the reference portion 46, and the motion support rail 22 is installed on the support rail mounting portion 44 and is also aligned with the reference surface 461 of the reference portion 46; the guide rail 21 and the motion support rail 22 are both provided with sliders, and the connecting component 31 and the motion component 32 are respectively connected to their respective sliders. Please refer to Figure 2 and Figure 4 In practical applications, the guide rail 21 of the embodiment of the present invention is installed on the installation surface of the guide rail 21 of the support plate 400 by screws, and the side of the guide rail 21 is firmly against the corresponding reference surface 461.

[0071] Furthermore, the embodiment of the present invention adopts three guide rails, one for the motion guide of the transfer support flange, and two for the motion support of the moving part 32. The T-nut 141 drives the transfer support flange under the guide support of the guide rail 21, so that the movement of the moving part 32 with double guide rail support in the axial direction is more stable and reliable. The two motion support rails 22 of the embodiment of the present invention are preferably installed on the mounting surfaces of two corresponding motion support rails 22 of the support plate 400 by screws, and the side edges of the motion support rails 22 are close to the corresponding reference surface 461. Among them, the two motion support rails 22 have the same structure, the mounting surfaces of the two motion support rails 22 are coplanar, and the mounting surfaces of the two support rail mounting parts 44 for mounting the two motion support rails 22 and the mounting surfaces of the guide rail mounting parts 43 for mounting the guide rail 21 are parallel to each other and meet the set parallelism requirements (preferably using a geometric tolerance of parallelism of 0.02). In practical applications, the reference surfaces 461 of the three corresponding side edges of the three guide rails installed in the embodiment of the present invention are parallel to each other and meet the set parallelism requirements (preferably a parallelism geometric tolerance of 0.02 is adopted).

[0072] Please continue reading Figure 2 and Figure 3 It should be pointed out that in order to limit the movement stroke of the moving component 300, a flexibly connected screw nut transmission device disclosed in an embodiment of the present invention, in addition to including a screw nut transmission mechanism 100, a guide rail mechanism 200, a moving component 300 and a support plate 400, also includes a limit assembly 500, and the limit assembly 500 is located between the guide rail 21 and the moving support rail 22; the limit assembly 500 includes a limit pin 51 and a pin sleeve 52, the limit pin 51 is fixed to the support plate 400, and the pin sleeve 52 is sleeved on the outer peripheral wall of the limit pin 51.

[0073] In practical applications, two limit pins 51 are provided at the two extreme positions of the movement of the slider on the guide rail 21 of the embodiment of the present invention, so as to effectively prevent the movement of the adapter support flange fixedly connected to the slider on the guide rail 21 beyond the limit position. Preferably, the limit pin 51 of the embodiment of the present invention is connected to the support plate 400 through a threaded hole, and the outer part of the limit pin 51 is sleeved with a pin sleeve 52 of elastic soft material (preferably TPEE material).

[0074] Based on the above-mentioned flexible connection screw nut transmission device, please continue to refer to Figure 2 , Figure 3 and Figure 4 The embodiment of the present invention further provides a method for adjusting a screw nut transmission device, the method comprising:

[0075] Step 1: Assemble the nut assembly 14 of the screw nut transmission mechanism 100. Specifically, (11) the nut adapter ring 142 is sleeved on the T-nut of the screw stepper motor 11, so that the flange surface of the nut adapter ring 142 fits with the flange surface of the T-nut 141, and then the nut adapter ring 142 and the T-nut 141 are locked and fixed as a whole with a detachable connecting piece; (12) the first joint bearing 143 is installed on the nut adapter ring 142, so that one end of the inner ring of the first joint bearing 143 is pressed against the nut adapter ring 142, and the other end of the inner ring is pressed by the inner ring pressure ring 144, and then the transfer support flange is sleeved on the outer ring of the first joint bearing 143, so that one end of the outer ring of the first joint bearing 143 is pressed against the inner flange end face 1452 of the transfer support flange, and the other end of the outer ring is fixed and pressed by the outer ring pressure ring 146 to fix the outer ring of the first joint bearing 143 and the transfer support flange, so that the T-nut 141 and the transfer support flange are flexibly connected through the first joint bearing 143.

[0076] Step 2: Install the guide rail 21 and the limit assembly 500 of the guide rail mechanism 200 on the support plate 400. Specifically, place the guide rail 21 on the guide rail 21 installation surface of the support plate 400 so that the side of the guide rail 21 and the reference surface 461 of the corresponding reference portion 46 are close to each other, and then fix the position of the guide rail 21 with a detachable connector. Next, install two limit pins 51 in the threaded holes at the corresponding positions of the support plate 400, and finally put an elastic and soft pin sleeve 52 on the outer peripheral wall of the limit pin 51.

[0077] Step 3, continue to install the screw nut transmission mechanism 100 on the support plate 400. Specifically, first put the screw stepper motor 11 into the corresponding position through the notch 411 on the motor mounting platform 41 of the support plate 400, and the tail of the screw of the screw stepper motor 11 extends into the mounting hole of the bearing mounting platform 42 of the support plate 400, and the screw stepper motor 11 is fixed to the motor mounting platform 41 of the support plate 400 using a detachable connector; then the support bearing 131 is sleeved on the tail of the screw body of the screw stepper motor 11 through the mounting hole on the bearing mounting platform 42 of the support plate 400; then the support bearing pressure ring 132 is used to fix the outer ring of the bearing and the bearing support platform of the support plate 400, so as to realize the tail support of the screw stepper motor 11 when the screw body rotates; finally, the protruding part of the adapter support flange is fixed to the slider of the guide rail 21 with a detachable connector.

[0078] Step 4: Assemble the movable connector of the motion assembly 300 and the motion component 32. Specifically, apply bearing glue on the side shaft of the motion component 32, install the movable connector on the side shaft of the motion component 32, and cure it at room temperature for 24 hours to fix the movable connector on the side shaft of the motion component 32.

[0079] Step 5: According to the method of step 3, the motion support rail 22 of the guide rail mechanism 200 is installed on the support plate 400, and the motion support rail 22, the motion component 300, and the connection component 31 are installed. Specifically, two motion support rails 22 are installed first; then the side shaft of the motion component 32 fixed with the second joint bearing 321 is inserted into the inner hole of the extension of the transfer support flange; then the motion component 32 is fixed to the sliders of the two motion support rails 22 by a detachable connector, so that the transfer support flange and the motion component 32 are flexibly connected through the second joint bearing 321.

[0080] Step 6: Debugging the screw nut transmission device, adjusting the detachable connector of the transfer support flange and the detachable connector of the moving part 32, until the connecting part 31 moves smoothly on the guide rail 21 and the movement speed meets the requirements. The above-mentioned debugging of the screw nut transmission device in the embodiment of the present invention includes: driving the screw stepper motor 11 to rotate, so that the T-nut 141 drives the transfer support flange and the moving part 32 to reciprocate within the range limited by the guide rail 21 and the axial limit pin 51. Specifically, the above-mentioned adjustment of the detachable connector of the transfer support flange and the detachable connector of the moving part 32 until the connecting part 31 moves smoothly on the guide rail 21 and the movement speed meets the requirements includes: if the slider of the guide rail 21 cannot move within the travel range or the speed is lower than the specified speed, first slightly loosen the detachable connector of the transfer support flange and the moving part 32 in sequence, and then tighten and fix the screws of the transfer support flange and the moving part 32 until the transfer support flange moves smoothly on the guide rail 21 and the movement speed meets the requirements.

[0081] The adjustment method of the embodiment of the present invention is not difficult for those skilled in the art to understand that in the adjustment process of the lead screw nut transmission device, it is usually necessary to control the lead screw stepper motor 11 with the help of a servo control circuit, control software, etc., and to assist the adjustment with the help of corresponding measuring equipment (such as a three-coordinate measuring instrument, a stopwatch). The lead screw nut transmission device after adjustment in the embodiment of the present invention eliminates the vibration caused by the radial force, and effectively improves the stability and motion accuracy of the motion process of the moving part 32.

[0082] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should be included in the protection scope of the present invention.

Claims

1. A flexible-connected screw-nut transmission device, characterized in that: include: Screw nut transmission mechanism, guide rail mechanism, motion assembly and support plate; wherein: The screw nut transmission mechanism is mounted on the support plate; the guide rail mechanism includes a guide rail and a motion support rail, and the guide rail is arranged in parallel with the motion support rail; the motion assembly includes a connecting component and a motion component, the connecting component is mounted on the guide rail, the motion component is mounted on the motion support rail, and the connecting component is located between the motion component and the screw nut transmission mechanism; The connecting component is connected to the moving component via a movable connecting piece; the connecting component is flexibly connected to the screw nut transmission mechanism.

2. A flexible-connected screw-nut transmission device according to claim 1, characterized in that: The screw and nut transmission mechanism includes a screw stepper motor, a screw body, a support assembly and a nut assembly, and the support plate includes a motor mounting platform and a bearing mounting platform, wherein: The lead screw stepper motor is mounted on the motor mounting platform of the support plate, one end of the lead screw body is fixedly connected to the lead screw stepper motor, the other end of the lead screw body is fixedly connected to the support assembly, and the nut assembly is mounted on the lead screw body and fixedly connected to the connecting component; The support assembly includes a support bearing and a support bearing pressure ring, one end of the outer ring of the support bearing is pressed against the end surface of the mounting hole on the bearing support platform of the support plate, and the other end of the outer ring of the support bearing is fixed by the support bearing pressure ring; the inner ring of the support bearing is sleeved on the other end of the screw body; The motor mounting platform is arranged in parallel with the bearing mounting platform, and the motor mounting platform, the bearing mounting platform, the support bearing and the support bearing pressure ring jointly ensure that the lead screw body does not vibrate when working.

3. A flexible-connected screw-nut transmission device according to claim 1, characterized in that: The screw and nut transmission mechanism comprises a screw stepping motor, a screw body and a nut assembly, wherein: The lead screw stepper motor is mounted on the support plate, and the output shaft of the lead screw stepper motor is fixedly connected to the lead screw body; The nut assembly comprises a T-nut, a nut adapter ring, a first joint bearing, an inner ring pressure ring and an adapter support, the T-nut is mounted on the lead screw body, the nut adapter ring is sleeved on the outer ring of the T-nut and the two are detachably connected; The first spherical bearing is mounted on the outer peripheral wall of the nut adapter ring, one end of the inner ring of the first spherical bearing is pressed against the nut adapter ring, and the other end is pressed by the inner ring pressure ring; The transition support is installed on the outer ring of the first spherical plain bearing, one end of the outer ring of the first spherical plain bearing is firmly pressed against the inner flange end surface of the transition support, and the other end is pressed by the outer ring pressure ring; The transfer support is fixedly connected to the connecting component to realize the fixed connection of two independent parts into one body. The connecting component is fixed on the slider of the guide rail through a detachable connecting piece.

4. A flexible-connected screw-nut transmission device according to claim 3, characterized in that: The connecting component and the transfer support are integrally processed into a transfer support flange, the connecting component serves as an extension of the transfer support flange, and the extension moves along the guide rail mechanism when the lead screw nut transmission mechanism is working; The transition support member serves as the main body of the transition support flange, the inner circular surface of the main body contacts the outer ring of the first spherical plain bearing, and the inner flange end surface of the main body contacts the outer ring end surface of the first spherical plain bearing; The movable connecting member is a second spherical bearing.

5. The flexibly connected lead screw and nut transmission device according to claim 1, characterized in that: The guide rail mechanism comprises a guide rail and a motion support rail, and the support plate comprises a guide rail mounting portion, a support rail mounting portion, a plate body and a plurality of reference portions; wherein: the guide rail and the motion support rail are arranged in parallel, the guide rail mounting portion and the support rail mounting portion are both located on the plate body, and the plurality of reference portions are respectively arranged on the side of the guide rail mounting portion and the side of the support rail mounting portion; The guide rail is installed on the guide rail installation part and is aligned with the reference surface of the reference part, and the motion support rail is installed on the support rail installation part and is aligned with the reference surface of the reference part; The guide rail and the motion support rail are both provided with sliders, and the connecting component and the motion component are respectively connected to the respective sliders.

6. The flexibly connected lead screw and nut transmission device according to claim 1, characterized in that: It also includes a limit assembly, which is located between the guide rail and the motion support rail; The limiting assembly comprises a limiting pin and a pin sleeve, wherein the limiting pin is fixed to the supporting plate, and the pin sleeve is sleeved on the outer peripheral wall of the limiting pin.

7. A method for adjusting a screw nut transmission device, based on a screw nut transmission device with a flexible connection according to any one of claims 1 to 6, characterized in that: The installation methods include: Assemble the nut assembly of the screw nut transmission mechanism; assemble the movable connector and moving parts of the motion assembly; Install the guide rail and the limit assembly of the guide rail mechanism on the support plate; continue to install the screw nut transmission mechanism on the support plate; install the motion support rail of the guide rail mechanism on the support plate, and complete the installation of the motion support rail, the motion assembly, and the connecting parts; Debug the screw nut transmission device, adjust the detachable connector of the adapter support flange and the detachable connector of the moving part, until the connecting part moves smoothly on the guide rail and the movement speed meets the requirements.

8. The method for assembling and adjusting a screw nut transmission device according to claim 7, characterized in that: The nut assembly of the screw nut transmission mechanism comprises: (1) The nut adapter ring is placed on the T-nut of the screw stepper motor so that the flange surface of the nut adapter ring fits the flange surface of the T-nut, and then the nut adapter ring and the T-nut are locked and fixed together with a detachable connector; (2) Install the first spherical plain bearing on the nut adapter ring so that one end of the inner ring of the first spherical plain bearing is pressed against the nut adapter ring, and the other end of the inner ring is pressed by the inner ring pressure ring. Then, sleeve the transfer support flange on the outer ring of the first spherical plain bearing so that one end of the outer ring of the first spherical plain bearing is pressed against the inner flange end face of the transfer support flange, and the other end of the outer ring is fixed and pressed by the outer ring pressure ring to tighten the outer ring of the first spherical plain bearing and the transfer support flange, so that the T-nut and the transfer support flange are flexibly connected through the first spherical plain bearing; Assemble the movable joints and moving parts of the moving components, including: Apply bearing glue to the side shaft of the moving part, install the movable connecting piece on the side shaft of the moving part, and cure it at room temperature for 24 hours to fix the movable connecting piece on the side shaft of the moving part.

9. The method for assembling and adjusting a screw nut transmission device according to claim 7, characterized in that: Install the guide rail and the limit assembly of the guide rail mechanism on the support plate, including: Place the guide rail on the guide rail installation surface of the support plate so that the side of the guide rail is close to the reference surface of the corresponding reference part, and then fix the position of the guide rail with a detachable connector. Next, install two limit pins in the threaded holes at the corresponding positions of the support plate, and finally put elastic soft pin sleeves on the outer peripheral walls of the limit pins. The screw nut transmission mechanism is further installed on the support plate, including: First, put the lead screw stepper motor into the corresponding position through the notch on the motor mounting platform of the support plate, and extend the tail of the lead screw of the lead screw stepper motor into the mounting hole of the bearing support platform of the support plate, and use a detachable connector to fix the lead screw stepper motor on the motor mounting platform of the support plate; then, sleeve the support bearing on the tail of the lead screw body of the lead screw stepper motor through the mounting hole on the bearing support platform of the support plate; then, use the support bearing pressure ring to fix the outer ring of the bearing and the bearing support platform of the support plate, so as to realize the tail support of the lead screw stepper motor when the lead screw rotates; finally, fix the protruding part of the adapter support flange to the slider of the guide rail with a detachable connector; Install the motion support rail of the guide rail mechanism on the support plate, and complete the installation of the motion support rail, motion components, and connecting parts, including: First, install two motion support rails; then insert the side shaft of the motion component fixed with the second joint bearing into the inner hole of the protruding part of the transfer support flange; then use a detachable connecting piece to fix the motion component on the sliders of the two motion support rails, so that the transfer support flange and the motion component are flexibly connected through the second joint bearing.

10. The method for assembling and adjusting a screw nut transmission device according to claim 7, characterized in that: Debugging of the screw nut transmission, including: The lead screw stepper motor is driven to rotate, so that the T-nut drives the adapter support flange and the moving parts to reciprocate within the range limited by the guide rail and the axial limit pin; Adjust the removable connector of the adapter support flange and the removable connector of the moving part until the connecting part moves smoothly on the guide rail and the movement speed meets the requirements, including: If the slider of the guide rail cannot move within the travel range or the speed is lower than the specified speed, first slightly loosen the detachable connectors of the adapter support flange and the moving parts in turn, and then tighten and secure the screws of the adapter support flange and the moving parts until the adapter support flange moves smoothly on the guide rail and the movement speed meets the requirements.

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