Structure for eliminating influence of thermal elongation of lead screw on precision

Abstract

The utility model relates to the technical field of lathe feeding systems, in particular to a structure for eliminating influence of thermal elongation of a lead screw on precision, which comprises the lead screw and a bearing seat, the bearing seat is rotatably connected with the end of the lead screw, a bearing is arranged between the bearing seat and the lead screw, and a first elastic part is arranged at the shaft end of the lead screw and between the lead screw and the bearing seat. A first spacer bush set is arranged between the lead screw and the bearing seat, the first spacer bush set is matched with the end, away from the bearing, of the first elastic piece in an abutting-against mode, the first spacer bush set comprises a base and an abutting-against plate, and a connecting block is arranged between the abutting-against plate and the base. The distance between the abutting block and the second spacer bush set is adjusted, and therefore the size of the space of the cavity where the first elastic piece is arranged is controlled.

Description

Technical Field

[0001] The utility model relates to the technical field of lathe feed systems, and particularly to a structure for eliminating the influence of thermal elongation of a lead screw on precision. Background Technique

[0002] In the patent with the publication number CN210451960U, a pre-tensioning structure for eliminating the influence of thermal elongation of a lead screw is disclosed, which includes a lead screw, a bearing seat, at least one bearing installed in the bearing seat, and a locking nut installed at the end of the lead screw shaft. The inner ring of the bearing is sleeved on the end of the lead screw and rotatably connected to the lead screw. It also includes a first opposing device sleeved on the end of the lead screw and located between the bearing and the shoulder of the lead screw, and a second opposing device sleeved on the end of the lead screw and located between the bearing and the locking nut. When the lead screw expands due to heat, the first opposing device is used to buffer the axial force exerted by the lead screw on the inner ring of the bearing, ensuring the service life of the bearing. The second opposing device is used to prevent the locking nut from loosening at the end of the lead screw, eliminating the axial clearance when the lead screw expands due to heat, thereby ensuring the positioning accuracy of high-speed and high-precision numerical control machine tools. At the same time, both the first opposing device and the second opposing device adopt the opposing method of disc springs, which has the advantages of low cost and simple and reliable assembly process. (ESM) The same invention has been applied for an invention patent on the same day. This patent buffers the axial force exerted by the lead screw on the bearing by setting springs in the bearing seat. However, the space in the bearing seat for accommodating the springs in this patent is fixed, which is not conducive to setting different springs according to the amplitude of the heat-induced extension of the lead screw.

[0003] Based on this, the utility model designs a structure for eliminating the influence of thermal elongation of a lead screw on precision to solve the above problems. Content of the Utility Model

[0004] The purpose of the utility model is to provide a structure for eliminating the influence of thermal elongation of a lead screw on precision to solve the above technical problems.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A structure for eliminating the influence of thermal elongation of a lead screw on precision, including a lead screw and a bearing seat. The bearing seat is rotatably connected to the end of the lead screw. A bearing is provided between the bearing seat and the lead screw. A first elastic member is provided at the end of the lead screw shaft. The first elastic member is provided between the lead screw and the bearing seat. A first spacer group is provided between the lead screw and the bearing seat. The first spacer group is in abutting match with the end of the first elastic member away from the bearing. The first spacer group includes a base and an abutting plate. A connecting block is provided between the abutting plate and the base.

[0006] Preferably, the connecting block is rotatably connected to the base, the connecting block is threadedly connected to the abutting plate, and the abutting plate is slidably matched with the base.

[0007] Preferably, the connecting block penetrates through the base, and a rotating block is provided at one end of the base away from the abutting plate. The rotating block and the base are rotationally matched with each other.

[0008] Preferably, a first sliding groove is provided on the base, and the abutting block is slidably matched with the first sliding groove.

[0009] Preferably, a second spacer sleeve group is provided between the first elastic member and the bearing. An embedding groove is provided on one side of the second spacer sleeve group away from the bearing. The first elastic member and the embedding groove are snap-fitted with each other.

[0010] Preferably, a second sliding groove is provided on the bearing seat, and a slider slidably matched with the second sliding groove is provided on the base. A second elastic member is provided between the slider and the base.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows: By making the abutting block slide along the first sliding groove in the base, the distance between the abutting block and the second spacer sleeve group is adjusted, so as to control the size of the cavity space where the first elastic member is arranged. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0013] Figure 1 It is a schematic diagram of the overall structure of the present utility model;

[0014] Figure 2 It is a schematic diagram of the structure of the bearing seat of the present utility model;

[0015] Figure 3 It is a schematic diagram of the structure of the first spacer sleeve group of the present utility model;

[0016] Figure 4 It is a schematic diagram of the structure of the second spacer sleeve group of the present utility model.

[0017] In the drawings, the list of components represented by each reference numeral is as follows:

[0018] 1 - lead screw, 2 - bearing seat, 21 - bearing, 22 - second sliding groove, 3 - first elastic member, 4 - first spacer sleeve group, 41 - base, 42 - abutting plate, 43 - connecting block, 44 - rotating block, 45 - first sliding groove, 46 - slider, 47 - second elastic member, 5 - second spacer sleeve group, 51 - embedding groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the utility model in conjunction with the accompanying drawings in the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the utility model.

[0020] Combined with Figures 1-4 :

[0021] A structure for eliminating the influence of thermal elongation of the lead screw on accuracy includes a lead screw 1 and a bearing seat 2. The bearing seat 2 is rotatably connected to the end of the lead screw 1. A bearing 21 is provided between the bearing seat 2 and the lead screw 1. A first elastic member 3 is provided at the shaft end of the lead screw 1. The first elastic member 3 is provided between the lead screw 1 and the bearing seat 2. A first spacer group 4 is provided between the lead screw 1 and the bearing seat 2. The first spacer group 4 is in abutting match with the end of the first elastic member 3 away from the bearing 21. The first spacer group 4 includes a base 41 and an abutting plate 42. A connecting block 43 is provided between the abutting plate 42 and the base 41.

[0022] Further, the connecting block 43 is rotatably connected to the base 41, the connecting block 43 is threadedly connected to the abutting plate 42, and the abutting plate 42 is slidably matched with the base 41.

[0023] Further, the connecting block 43 penetrates through the base 41. A rotating block 44 is provided at the end of the connecting block 43 away from the abutting plate 42. The rotating block 44 is rotatably matched with the base 41.

[0024] Further, a first sliding groove 45 is provided on the base 41. The abutting block 42 is slidably matched with the first sliding groove 45.

[0025] Further, a second spacer group 5 is provided between the first elastic member 3 and the bearing 21. An embedding groove 51 is provided on the side of the second spacer group 5 away from the bearing 21. The first elastic member 3 is in clamping match with the embedding groove 51.

[0026] Further, a second sliding groove 22 is provided on the bearing seat 2. A slider 46 that is slidably provided on the base 41 and is in match with the second sliding groove 22 is provided. A second elastic member 47 is provided between the slider 46 and the base 41.

[0027] Specific application embodiments of the present utility model:

[0028] The first elastic member 3 can be made of a spring and is arranged between the bearing seat 2 and the lead screw 1. One end of the first elastic member 3 away from the bearing 21 is matched with the first spacer sleeve group 4. When the shoulder of the lead screw 1 presses the first spacer sleeve group 4, the first elastic member 3 can buffer the force towards the bearing 21. In the first spacer sleeve group 4, the abutting plate 42 abuts and matches with the first elastic member 3. By controlling the position of the abutting plate 42, the range of the first elastic member arranged between the first spacer sleeve group 4 and the second spacer sleeve group 5 is adjusted, which is beneficial to adapting different springs. The abutting plate 42 is slidably matched with the first chute 45 to limit the moving path of the abutting plate 42. The abutting plate 42 is threadedly matched with the connecting block 43. By rotating the connecting block 43, the abutting plate 42 is driven to slide between the base 41 and the connecting block 43. One end of the connecting block 43 passing through the base 41 is provided with a rotating block 44, and the rotating block 44 extends out of the bearing seat 2, which is beneficial to controlling the rotation of the connecting block 43. The slider 46 arranged on the base 41 is slidably matched with the second chute 22 opened on the bearing seat 2. By using the end wall of the slider 46 and the second chute 22 to abut and match, the first spacer sleeve group 4 is limited to prevent it from moving out of the bearing seat 2. A second elastic member 47 is arranged between the slider 46 and the base 41. By applying an external force to the slider 46 to compress the second elastic member 47, the slider 46 is moved out of the second chute 22, which is convenient for disassembling the first spacer sleeve group 4. The second spacer sleeve group 5 is arranged between the first elastic member 3 and the bearing 21. By using the first elastic member 3 and the engaging groove 51 arranged on the second spacer sleeve group 5 to engage and match, it is ensured that the first elastic member 3 and the lead screw 1 are coaxially arranged.

[0029] In the description of the utility model, it should be understood that the orientation or positional relationship indicated by the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inner", "front", "center", "both ends", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the utility model.

[0030] In the utility model, unless otherwise clearly defined and limited, the terms "installation", "setting", "connection", "fixation", "swivel connection", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. It can be the communication inside two elements or the interaction relationship between two elements. Unless otherwise clearly defined, for those of ordinary skill in the art, the specific meanings of the above terms in the utility model can be understood according to specific situations.

[0031] Although embodiments of the utility model have been shown and described, those of ordinary skill in the art will understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the utility model. The scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A structure for eliminating the influence of thermal elongation of the lead screw on accuracy, comprising a lead screw (1) and a bearing seat (2), characterized in that: The bearing block (2) is rotatably connected to the end of the lead screw (1). A bearing (21) is provided between the bearing block (2) and the lead screw (1). A first elastic member (3) is provided at the shaft end of the lead screw (1). The first elastic member (3) is provided between the lead screw (1) and the bearing block (2). A first spacer set (4) is provided between the lead screw (1) and the bearing block (2). The first spacer set (4) is in abutting match with one end of the first elastic member (3) away from the bearing (21). The first spacer set (4) includes a base (41) and an abutting plate (42). A connecting block (43) is provided between the abutting plate (42) and the base (41).

2. The structure for eliminating the influence of thermal elongation of the lead screw on accuracy according to claim 1, characterized in that: The connecting block (43) is rotatably connected to the base (41). The connecting block (43) is threadedly connected to the abutting plate (42). The abutting plate (42) is in sliding match with the base (41).

3. A structure for eliminating the influence of thermal elongation of the lead screw on precision according to claim 2, characterized in that: The connecting block (43) penetrates through the base (41). A rotating block (44) is provided at one end of the connecting block (43) away from the abutting plate (42) and the rotating block (44) is in rotational match with the base (41).

4. A structure for eliminating the influence of thermal elongation of the lead screw on precision according to claim 2, characterized in that: A first sliding groove (45) is provided on the base (41). The abutting plate (42) is in sliding match with the first sliding groove (45).

5. A structure for eliminating the influence of thermal elongation of a lead screw on accuracy according to claim 1, characterized in that: A second spacer set (5) is provided between the first elastic member (3) and the bearing (21). A socket (51) is provided on one side of the second spacer set (5) away from the bearing (21). The first elastic member (3) is in snap-fit with the socket (51).

6. The structure for eliminating the influence of thermal elongation of the lead screw on accuracy according to claim 1, wherein: A second sliding groove (22) is provided on the bearing block (2). A slider (46) that is in match with the second sliding groove (22) is slidably provided on the base (41). A second elastic member (47) is provided between the slider (46) and the base (41).

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