Pre-drawing mounting structure of pre-drawing lead screw

Abstract

The utility model relates to the field of machining center accessory structures, and particularly discloses a pre-drawing mounting structure of a pre-drawing screw rod, which comprises a machining center frame, a motor fixing seat and a threaded screw rod, a motor fixing seat is fixedly connected to the machining center frame. A threaded screw rod is rotationally inserted into the motor fixing seat; a first plane bearing and a first bearing are fixedly connected between the threaded lead screw and the motor fixing base. A digital display torque wrench is connected with a second fastener to rotate to generate displacement, so that a second plane bearing, an extension pipe and a threaded screw rod are accurately controlled and pushed to generate accurate displacement, the threaded screw rod is subjected to the same tensile force as that during pre-tensioning during machining, and the thread pitch of the threaded screw rod keeps the accuracy during machining; therefore, the precision of driving the reciprocating motion after actual installation reaches the machining precision, and the problem that an existing threaded lead screw is high in machining precision but low in precision after being stressed and stretched after installation is solved.

Description

Technical Field

[0001] The utility model relates to the field of machining center accessories, in particular to a pre-tensioned installation structure of a pre-tensioned wire rod. Background Art

[0002] A screw rod is a mechanical transmission element, which is composed of a threaded wheel and a screw rod. It is mainly used to convert rotational motion into linear motion, or to transmit external force along the axial direction. Screw rods are very common in mechanical processing equipment, such as lathes, milling machines and three-axis milling machines, as driving components for linear motion.

[0003] The Chinese utility model patent with publication number CN115435057B disclosed a screw pre-tensioning structure on September 22, 2023, which belongs to the field of screw pre-tensioning technology. In order to solve the problem that traditional screws will elongate due to heat during operation, but the current machine tools cannot compensate for the thermal expansion of the screw well, which will affect the movement accuracy of the actuator moving thereon, thereby affecting the machining accuracy of the machine tool, resulting in the traditional screw being inconvenient to ensure that the straightness and force rigidity of its rotation axis can be ensured after the screw is deformed and elongated, and then the pre-tensioning force fails after long-term operation; the present invention uses a locking nut for locking, the locking nut squeezes the spacer ring A, the spacer ring A squeezes the elastic disc, the elastic disc squeezes the spacer ring B, the spacer ring B squeezes the inner ring of the embedded bearing, and then the thread is tightened by the second threaded column set on the pre-tightening cover, and the pre-tightening cover is used to push the spacer ring A to extrude the elastic disc, and the screw pre-tensioning is realized by the principle of mutual action.

[0004] However, the above-mentioned disclosed scheme has the following shortcomings: it only considers the thermal expansion of the screw rod, which changes the size of the screw rod and makes pre-tension compensation, but does not consider the situation where, for example, the pull rod is fixed vertically and a heavy object is threadedly connected. In this case, if the weight is too heavy, the screw rod will be stretched, resulting in a change in the size of the screw rod and a change in the thread pitch of the screw rod, thereby affecting the accuracy of the linear displacement. Utility Model Content

[0005] The utility model aims to solve the technical problem that pre-tensioning compensation is made by only considering the change in the size of the screw rod due to thermal expansion, but does not consider the situation that, for example, the pull rod is vertically fixed and a heavy object is threadedly connected. In this case, if the heavy object is too heavy, the screw rod will be stretched, resulting in a change in the size of the screw rod and a change in the thread pitch of the screw rod, thereby affecting the accuracy of the linear displacement. A pre-tensioning installation structure for a pre-tensioned screw rod is provided.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] The utility model describes a pre-tensioned installation structure for a pre-tensioned screw rod, comprising a machining center frame, a motor fixing seat and a threaded screw rod; the machining center frame is fixedly connected to the motor fixing seat; a threaded screw rod is rotatably inserted into the motor fixing seat; a first plane bearing and a first bearing are fixedly connected between the threaded screw rod and the motor fixing seat; a first fastener is threadedly inserted into a hole at the other end of the threaded screw rod; an extension tube is sleeved on the first fastener; an alignment fixing seat is sleeved on the extension tube and the threaded screw rod; a second plane bearing is fixedly connected between the alignment fixing seat and the extension tube; a plurality of second fasteners are inserted into threaded grooves corresponding to the second plane bearing openings on the alignment fixing seat.

[0008] Furthermore, a coupling is fixedly connected to the end of the threaded screw.

[0009] Furthermore, a limiting nut is threadedly sleeved on the second fastener.

[0010] Furthermore, the motor fixing seat is provided with a through hole for fixing the motor.

[0011] Furthermore, a through groove is provided on the motor fixing seat corresponding to the coupling.

[0012] The utility model provides a pre-tensioned installation structure for a pre-tensioned wire rod, which has the following beneficial effects:

[0013] 1. The utility model connects the second fastener with a digital torque wrench to rotate and generate displacement, thereby accurately controlling and pushing the second plane bearing, the extension tube and the threaded screw to generate accurate displacement, so that the threaded screw is subjected to the same tension as that during pre-tensioning during processing, so that the thread pitch of the threaded screw maintains the accuracy during processing, so that the accuracy of driving the reciprocating movement after actual installation reaches the processing accuracy, solving the problem that the existing threaded screw has high processing accuracy but low accuracy after being stretched by force after installation;

[0014] 2. The utility model threadably sleeves a limit nut on the second fastener, so that the second fastener can be fixed by the limit nut, so that the second fastener can be subjected to force to push the second plane bearing, the extension tube and the first fastener, thereby indirectly pulling the threaded screw, so that it is subjected to controllable pulling force during installation, thereby restoring the accuracy during pre-tensioning processing, that is, the initial position, so that the threaded screw can maintain a high-precision thread pitch after being subjected to force during installation, making it more accurate when driving the threaded screw to rotate and change the linear position, solving the problem of low precision caused by the change of thread pitch after the existing threaded screw is subjected to pulling force after being processed in a natural state and installed on a machining center. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The specific implementation of the utility model is further described in detail below in conjunction with the accompanying drawings;

[0016] Figure 1 This is a first axonometric structural schematic diagram of the utility model;

[0017] Figure 2 It is a second axonometric structural schematic diagram of the utility model;

[0018] Figure 3 It is a schematic diagram of the half-section structure of the utility model.

[0019] Explanation of the numbers in the figure: 1. Machining center frame; 2. Motor fixing seat; 3. Threaded screw; 4. Coupling; 5. First plane bearing; 6. First bearing; 7. First fastener; 8. Extension tube; 9. Second plane bearing; 10. Alignment fixing seat; 11. Second fastener; 12. Limit nut. DETAILED DESCRIPTION

[0020] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] It should be noted that all directional indications in the embodiments of the present invention (such as up-down-left-right-front-back...) are only used to explain the relative position relationship - movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. The connection can be a direct connection or an indirect connection.

[0023] See also Figure 1-3As shown, a pre-tensioned installation structure of a pre-tensioned screw rod comprises a machining center frame 1, a motor fixing seat 2 and a threaded screw rod 3; the machining center frame 1 is fixedly connected to the motor fixing seat 2; the threaded screw rod 3 is rotatably inserted on the motor fixing seat 2; a first plane bearing 5 and a first bearing 6 are fixedly connected between the threaded screw rod 3 and the motor fixing seat 2; a first fastener 7 is threadedly inserted into a hole at the other end of the threaded screw rod 3; an extension tube 8 is sleeved on the first fastener 7; an alignment fixing seat 10 is sleeved on the extension tube 8 and the threaded screw rod 3; a second plane bearing 9 is fixedly connected between the alignment fixing seat 10 and the extension tube 8; A plurality of second fasteners 11 are inserted into the threaded grooves corresponding to the second plane bearing 9 on the alignment fixing seat 10; when working, the second fasteners 11 are connected by a digital torque wrench to rotate and generate displacement, thereby accurately controlling and pushing the second plane bearing 9, the extension tube 8 and the threaded screw 3 to generate precise displacement, so that the threaded screw 3 is subjected to the same tension as that during pre-tensioning during processing, so that the thread pitch of the threaded screw 3 maintains the accuracy during processing, so that the accuracy when driving the reciprocating movement after actual installation reaches the processing accuracy, which solves the problem that the existing threaded screw 3 has high processing accuracy but low accuracy after being stretched by force after installation.

[0024] The end of the threaded screw 3 is fixedly connected with a coupling 4; when working, the coupling 4 is connected to an external motor, and the motor can drive the coupling 4 and the threaded screw 3 to rotate, thereby driving the threaded slider and other structures sleeved on the threaded screw 3 to perform precise linear motion.

[0025] The second fastener 11 is threadedly sleeved with a limiting nut 12; when working, the second fastener 11 can be fixed by the limiting nut 12 by threading the limiting nut 12 on the second fastener 11, so that the second fastener 11 can be subjected to force to push the second plane bearing 9, the extension tube 8 and the first fastener 7, thereby indirectly pulling the threaded screw 3, so that it is subjected to controllable tension during installation, thereby restoring the accuracy during pre-tensioning, that is, the initial position, so that the threaded screw 3 can maintain a high-precision thread pitch after being subjected to force during installation, so that it is more accurate when driving the threaded screw 3 to rotate and change the linear position, thereby solving the problem of low precision caused by the existing threaded screw 3 being subjected to tension after being processed in a natural state and installed on a machining center.

[0026] The motor fixing seat 2 is provided with a through hole for fixing the motor; when working, the motor fixing seat 2 is provided with a through hole for fixing the motor, so that the motor can be conveniently installed and fixed, and at the same time it can be stably fixed on the machining center frame 1, and the precise number of rotations and angles of the threaded screw 3 can be driven by the motor connecting coupling 4, so that the reciprocating distance of the linear motion can be accurately adjusted.

[0027] The motor fixing base 2 is provided with a through groove corresponding to the coupling 4; during operation, the motor fixing base 2 is provided with a through groove corresponding to the coupling 4, so that when installing and removing the coupling 4, the hexagonal wrench can be conveniently rotated, and the installation and removal of the threaded screw 3, the first plane bearing 5 and the first bearing 6 are also convenient, and the weight of the motor fixing base 2 is reduced.

[0028] By adopting the above scheme, when the utility model is in use, the second fastener 11 is connected to the digital torque wrench for rotation to generate displacement, thereby accurately controlling and pushing the second plane bearing 9, the extension tube 8 and the threaded screw 3 to generate precise displacement, so that the threaded screw 3 is subjected to the same pulling force as that during pre-tensioning during processing, so that the thread pitch of the threaded screw 3 maintains the accuracy during processing, so that the accuracy when driving the reciprocating movement after actual installation reaches the processing accuracy, solving the problem that the existing threaded screw 3 has high processing accuracy but low accuracy after being stretched after installation; by connecting the coupling 4 to an external motor, the coupling 4 and the threaded screw 3 can be driven by the motor to rotate, thereby driving the threaded slider and other structures sleeved on the threaded screw 3 to perform precise linear motion; by threading the limiting nut 12 on the second fastener 11, the second fastener 11 can be fixed by the limiting nut 12, so that the second fastener 11 can be subjected to force to push the second plane bearing 9, the extension tube 8 and the first fastener 7, thereby indirectly pulling the thread The screw rod 3 is subjected to a controllable pulling force during installation, thereby restoring the accuracy during the pre-tensioning process, that is, the initial position, so that the threaded screw rod 3 can maintain a high-precision thread pitch after being subjected to force during installation, making it more accurate when driving the threaded screw rod 3 to rotate and change the linear position, thereby solving the problem of low accuracy caused by the threaded screw rod 3 being subjected to pulling force after being processed in the natural state and installed on the machining center; a through hole for fixing the motor is provided on the motor fixing seat 2, so that the motor can be easily installed and fixed, and at the same time, it can be stably fixed on the machining center frame 1, and the precise number of rotations and angles of the threaded screw rod 3 can be driven by connecting the coupling 4 through the motor, so that the reciprocating distance of the linear motion can be accurately adjusted; a through groove is provided on the motor fixing seat 2 corresponding to the coupling 4, so that when installing and disassembling the coupling 4, the hexagonal wrench can be used for rotation operation, which also facilitates the installation and disassembly of the threaded screw rod 3, the first plane bearing 5 and the first bearing 6, and reduces the weight of the motor fixing seat 2.

[0029] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0030] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A pre-tensioned installation structure for a pre-tensioned wire rod, It is characterized by: The invention comprises a machining center frame (1), a motor fixing seat (2) and a threaded screw (3); the machining center frame (1) is fixedly connected to the motor fixing seat (2); the threaded screw (3) is rotatably plugged into the motor fixing seat (2); a first plane bearing (5) and a first bearing (6) are fixedly connected between the threaded screw (3) and the motor fixing seat (2); a first fastener (7) is threadedly plugged into a hole at the other end of the threaded screw (3); an extension tube (8) is sleeved on the first fastener (7); an alignment fixing seat (10) is sleeved on the extension tube (8) and the threaded screw (3); a second plane bearing (9) is fixedly connected between the alignment fixing seat (10) and the extension tube (8); and a plurality of second fasteners (11) are plugged into the threaded grooves corresponding to the second plane bearing (9) in the hole openings on the alignment fixing seat (10).

2. The pre-tensioned installation structure of the pre-tensioned wire rod according to claim 1, Features: A coupling (4) is fixedly connected to the end of the threaded screw rod (3).

3. The pre-tensioned installation structure of the pre-tensioned wire rod according to claim 2, Features: A limit nut (12) is threadedly sleeved on the second fastener (11).

4. The pre-tensioned installation structure of the pre-tensioned wire rod according to claim 3, Features: The motor fixing seat (2) is provided with a through hole for fixing the motor.

5. The pre-tensioned installation structure of the pre-tensioned wire rod according to claim 4, Features: A through slot is provided on the motor fixing seat (2) corresponding to the coupling (4).

Images