Lead screw pre-stretching structure for numerical control machine tool

Abstract

The utility model discloses a lead screw pre-stretching structure for a numerical control machine tool, and relates to the technical field of lead screw mounting structures, the lead screw pre-stretching structure comprises a bearing seat main body, and one end of a lead screw can be mounted on the bearing seat main body; the bearing seat gland is mounted on the bearing seat main body, so that the screw rod is fixed; the bearing gland is arranged between the bearing seat main body and the bearing seat gland; the bushing is arranged on the screw rod in a sleeving manner; the locking nut is in threaded connection with the pre-stretching section of the lead screw; the first sealing assembly is arranged on the lead screw in a sleeving mode, and the first sealing assembly is connected between the bearing seat body and the bearing seat gland; and the second sealing assembly is arranged on the lead screw in a sleeving mode, and the second sealing assembly is connected between the bearing gland and the lining. The stretching effect is good, and the sealing performance is good.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of screw rod mounting structures, in particular to a screw rod pre-stretching structure for a numerical control machine tool. BACKGROUND

[0002] During operation, a screw rod generates a large amount of heat, and the heat causes the screw rod to elongate, which affects the transmission accuracy of the screw rod if no intervention is made, in order to solve the problem, a pre-stretching structure is designed, that is, the screw rod is stretched in advance to compensate for the transmission accuracy problem caused by the temperature rise of the screw rod, but the sealing property of the screw rod is affected after stretching.

[0003] Therefore, the existing pre-stretching structure needs to be improved. CONTENT OF THE UTILITY MODEL

[0004] Therefore, the application provides a screw rod pre-stretching structure for a numerical control machine tool to solve the technical problem that the sealing property of the screw rod is affected after stretching.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0006] A screw rod pre-stretching structure for a numerical control machine tool comprises:

[0007] A bearing seat body, wherein a pre-stretching section of a screw rod is installed on the bearing seat body;

[0008] A bearing seat gland, wherein the bearing seat gland is installed on the bearing seat body to fix the pre-stretching section of the screw rod;

[0009] A bearing gland, wherein the bearing gland is installed between the bearing seat body and the bearing seat gland;

[0010] A bushing, wherein the bushing is sleeved on the screw rod;

[0011] A locking nut, wherein the locking nut is threadedly connected to the pre-stretching section of the screw rod;

[0012] A first sealing assembly, wherein the first sealing assembly is sleeved on the screw rod and connected between the bearing seat body and the bearing seat gland;

[0013] A second sealing assembly, wherein the second sealing assembly is sleeved on the screw rod and connected between the bearing gland and the bushing.

[0014] Further, the screw rod is installed between the bearing seat body and the bearing seat gland through at least one bearing, and the bearing gland and the bushing are both pressed against the outer ring of the rightmost bearing.

[0015] Further, the first sealing assembly comprises:

[0016] An outer sealing part is sleeved on the bearing seat body and the bearing seat gland;

[0017] A sealing lip part is integrally connected with the outer sealing part, and the sealing lip part abuts against the lead screw.

[0018] Further, the sealing lip part comprises a first sealing lip, a second sealing lip and a third sealing lip which are spaced apart and abut against the lead screw, a clamping groove is arranged on the third sealing lip, and an elastic ring is installed in the clamping groove.

[0019] Further, an annular groove is formed on the outer sealing part, a first protrusion is arranged on the bearing seat body, a second protrusion is arranged on the bearing seat gland, and the first protrusion and the second protrusion are oppositely arranged in the groove.

[0020] Further, the second sealing assembly is fixed by a pair of pressing plates, and the pair of pressing plates are symmetrically installed in the bearing gland.

[0021] Further, the second sealing assembly comprises a fixed part, a bent part and a blocking part, the pressing plate can be pressed on the fixed part, and the blocking part can abut against the bushing.

[0022] Further, a locking screw is installed on the locking nut, and the locking screw abuts against the lead screw.

[0023] Further, a plurality of limiting insertion holes are formed on the bearing seat body, and a plurality of limiting insertion rods which are matched with the corresponding limiting insertion holes are arranged on the bearing seat gland.

[0024] From the above technical solution, the advantages of the present application are:

[0025] 1. The first sealing assembly is arranged in the present application, which can seal the outer periphery of the lead screw, so that the first sealing assembly can seal the lead screw, and the first sealing assembly of the present application has elasticity, which can achieve good sealing effect even if the lead screw is stretched.

[0026] 2. The second sealing assembly is arranged in the present application, which can seal the outer periphery of the bushing, so that the bushing and the bearing gland have good sealing effect, so as to prevent dust and foreign matters from entering the bearing through the connection between the bushing and the bearing gland, thereby affecting the normal work of the bearing. In addition, the second sealing assembly is pressed on the bushing, so that the bushing and the lead screw are tightly abutted, thereby indirectly improving the sealing property between the bushing and the lead screw. Attached Figure Description

[0027] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0028] Figure 1 This is a schematic diagram of the structure of this application.

[0029] Figure 2 for Figure 1 The exploded diagram.

[0030] Figure 3 for Figure 1 ZZ view.

[0031] Figure 4 for Figure 3 A magnified view of part A.

[0032] Figure 5 for Figure 3 A magnified view of section B.

[0033] Figure 6 This is a partial cross-sectional view of the second sealing component of this application.

[0034] Figure 7 This is a partial sectional view of the bearing cap of this application.

[0035] Explanation of reference numerals in the attached drawings: 1-Bearing housing body; 11-First protrusion; 12-Limiting insertion hole; Shaft 2-Bearing housing cover; 21-Second protrusion; 22-Limiting insertion rod; 23-First screw; 24-Step groove; 25-Mounting groove; 3-Bearing; 4-Bushing; 5-Locking nut; 6-Bearing cover; 61-Mounting groove; 62-Through hole; 63-Second screw; 7-Second sealing assembly; 71-Fixing part; 72-Bending part; 73-Sealing part; 8-First sealing assembly; 81-Outer sealing part; 811-Groove; 82-First sealing lip; 83-Second sealing lip; 84-Third sealing lip; 841-Slot; 85-Elastic ring; 9-Pressure plate; 10-Third screw; 20-Locking screw; 100-Lead screw; 101-Thread. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the embodiments and accompanying drawings. Here, the illustrative embodiments and their descriptions are used to explain this application, but are not intended to limit it.

[0037] refer to Figures 1 to 7 ,like Figure 1 and Figure 3As shown, the embodiment provides a screw pre-tensioning structure for a numerical control machine tool, which comprises a bearing seat body 1, a bearing seat gland 2, a bearing gland 6, a bushing 4, a locking nut 5, a first sealing assembly 8 and a second sealing assembly 7, one end of a screw 100 can be installed in a plurality of bearings 3 on the bearing seat body 1; the bearing seat gland 2 is installed on the bearing seat body 1 by a plurality of first screws 23, so as to fix the screw 100 and the bearings 3; the bearing gland 6 is installed at the right end of the bearing seat body 1 and the bearing seat gland 2, and is used for fixing the position of the bearings 3; the bushing 4 is sleeved on the screw 100, and abuts against the rightmost bearing 3, so that the plurality of bearings 3 are installed firmly and not loose; the right end of the screw 100 is used as a pre-tensioning section, a thread 101 is arranged on the pre-tensioning section, the locking nut 5 can be threadedly connected on the thread 101, during tensioning, the locking nut 5 is screwed on the thread 101, and gradually tightened as approaching the bushing 4, and the screw 100 is gradually stretched as the locking nut 5 is continuously tightened; the first sealing assembly 8 is sleeved on the screw 100, and connected between the bearing seat body 1 and the bearing seat gland 2; the second sealing assembly 7 is sleeved on the screw 100, and connected between the bearing gland 6 and the bushing 4, during the tightening process of the locking nut 5, the first sealing assembly 8 will always abut against the screw 100, so that the outer periphery of the screw 100 is well sealed, the second sealing assembly 7 will always abut against the bushing 4, and the bushing 4 will extrude the screw 100 under the abutting action, so as to also enable the outer periphery of the screw 100 to be well sealed, therefore, the first sealing assembly 8 and the second sealing assembly 7 can be arranged to well seal the screw 100.

[0038] In the embodiment, the bearing gland 6 and the bushing 4 abut against the outer ring of the rightmost bearing 3, so that the bearings 3 are installed firmly and not loose.

[0039] As shown in Figure 3 and Figure 4 , the first sealing assembly 8 comprises an outer sealing part 81 and a sealing lip part, an annular groove 811 is formed on the outer periphery of the outer sealing part 81, a first protrusion 11 is arranged at the upper end of the bearing seat body 1, a second protrusion 21 is arranged at the lower end of the bearing seat gland 2, the first protrusion 11 and the second protrusion 21 are oppositely arranged in the groove 811, so that the outer sealing part 81 can be accurately and stably sleeved between the bearing seat body 1 and the bearing seat gland 2; the sealing lip part is integrally connected with the inner side of the outer sealing part 81, and abuts against the screw 100.

[0040] As shown in Figure 4As shown, the sealing lip includes: a first sealing lip 82, a second sealing lip 83 and a third sealing lip 84 which are spaced and abut on the lead screw 100, the third sealing lip 84 is provided with a clamping groove 841, and the elastic ring 85 is installed in the clamping groove 841, and the first sealing lip 82 and the second sealing lip 83 are both inclined and abut on the lead screw 100, so that the first sealing lip 82 and the second sealing lip 83 can be deformed to ensure that they are always pressed on the lead screw 100, thereby ensuring the sealing effect of the lead screw 100; in addition, by arranging the elastic ring 85, the third sealing lip 84 can be deformed, thereby enabling the third sealing lip 84 to tightly abut on the lead screw 100. Therefore, by arranging the first sealing assembly 8, the lead screw 100 and the bearing seat body 1, and the lead screw 100 and the bearing seat gland 2 can have good sealing.

[0041] As shown in Figure 5 The second sealing assembly 7 is fixed and pressed by a pair of pressing plates 9, and the pair of pressing plates 9 are symmetrically installed in the bearing gland 6 by the third screw 10.

[0042] As shown in Figure 7 The bearing gland 6 is provided with a mounting groove 61 and a plurality of through holes 62, the mounting groove 61 is used to mount the fixed part 71 of the second sealing assembly 7, so that the mounting position of the fixed part 71 is accurate, and the second screw 63 can pass through and be connected on the bearing seat body 1 or the bearing seat gland 2 through the through hole 62, realizing the installation between the bearing gland 6 and the bearing seat body 1 or the bearing seat gland 2, and the left end of the bearing gland 6 is pressed on the outer ring of the rightmost bearing 3, so that the bearing 3 can be fastened.

[0043] Preferably, the bearing seat body 1 and the bearing seat gland 2 are both provided with a stepped groove 24 and a mounting groove 25, the bearing gland 6 is installed in the pair of stepped grooves 24 by the second screw 63, and the plurality of bearings 3 are arranged in the pair of mounting grooves 25.

[0044] As shown in Figure 6 The second sealing assembly 7 includes a fixed part 71, a bending part 72 and a plugging part 73, the pressing plate 9 can be pressed on the fixed part 71, so that the fixed part 71 is limited in the through hole 62, and the plugging part 73 can abut on the bushing 4, and the second sealing assembly 7 as a whole presents a "V" structure, and when the plugging part 73 is deformed by extrusion, the bending part 72 will be deformed to avoid the connection with the fixed part 71 being broken.

[0045] As shown in Figure 3As shown, a locking screw 20 is installed on the locking nut 5, and the locking screw 20 abuts against the lead screw 100. Specifically, after the lead screw 100 is stretched by tightening the locking nut 5, the locking screw 20 is installed between the locking nut 5 and the lead screw 100 to make the connection between the locking nut 5 and the lead screw 100 more reliable.

[0046] like Figure 2 As shown, the bearing housing body 1 has several limiting holes 12, and the bearing housing cover 2 has several limiting rods 22 that are adapted to the corresponding limiting holes 12. By cooperating with the limiting holes 12, the bearing housing body 1 and the bearing housing cover 2 can be installed in a more accurate position.

[0047] Working principle (when pre-stretching only one end of the lead screw): Fix the bearing housing body 1 to the bed of the CNC machine tool using screws or bolts. After fixing the left side of the lead screw 100, install the right side of the lead screw 100 on the bearing housing body 1 (the first sealing component 8 and the bearing 3 are pre-installed between the bearing housing body 1 and the bearing housing cover 2, with the first sealing component 8 installed before the bearing housing cover 2). Then, install the bushing 4, the second sealing component 7, and the bearing cover 6 in sequence. Finally, screw the locking nut 5 into the right end of the lead screw 100. As the locking nut 5 is tightened, the lead screw 100 is gradually stretched. Then, install the locking screw 20 between the locking nut 5 and the lead screw 100. The above is the pre-stretching process.

[0048] During the pre-stretching process, the lead screw 100 is gradually stretched, while the second sealing component 7 and the first sealing component 8 are both under compression during installation. Therefore, even if the lead screw 100 becomes longer, the second sealing component 7 and the first sealing component 8 can adapt to the deformation to ensure a good sealing effect with the lead screw 100.

[0049] It should be noted that the bushing 4, the second sealing component 7, and the first sealing component 8 are all made of rubber. Since the bearing cap 6 will squeeze the second sealing component 7 during installation, the second sealing component 7 can exert a squeezing effect on the bushing 4 when it is installed between the bearing cap 6 and the bushing 4. The bushing 4 will deform in the middle when squeezed, so even if the lead screw 100 is elongated, the bushing 4 can still seal the lead screw 100. That is, both the second sealing component 7 and the first sealing component 8 can provide a good seal for the lead screw 100.

[0050] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to the embodiments of this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A lead screw pre-tensioning structure for a numerically controlled machine tool, characterized by, The utility model relates to a bearing seat and locking nut structure of screw rod, including: Bearing seat body (1), the pre-stretching section of screw rod (100) is installed on bearing seat body (1), Bearing seat gland (2), bearing seat gland (2) is installed on bearing seat body (1), realizes the fixation to the pre-stretching section of screw rod (100), Bearing gland (6), bearing gland (6) is installed between bearing seat body (1) and bearing seat gland (2), Bushing (4), bushing (4) is sleeved on screw rod (100), Locking nut (5), locking nut (5) is threadedly connected on the pre-stretching section of screw rod (100), First sealing assembly (8), first sealing assembly (8) is sleeved on screw rod (100), and first sealing assembly (8) is connected between bearing seat body (1) and bearing seat gland (2), Second sealing assembly (7), second sealing assembly (7) is sleeved on screw rod (100), and second sealing assembly (7) is connected between bearing gland (6) and bushing (4).

2. The lead screw pre-tensioning structure for a numerical control machine tool according to claim 1, characterized in that, Screw rod (100) is installed between bearing seat body (1) and bearing seat gland (2) through at least one bearing (3), and bearing gland (6) and bushing (4) are all pressed on the outer ring of the rightmost bearing (3).

3. The pre-tensioning structure for a lead screw of a numerical control machine tool according to claim 1, characterized in that, First sealing assembly (8) includes: Outer sealing portion (81), outer sealing portion (81) is sleeved on bearing seat body (1) and bearing seat gland (2), Sealing lip, sealing lip is integrally connected with outer sealing portion (81), and sealing lip is abutted on screw rod (100).

4. The lead screw pre-tensioning structure for a numerical control machine tool according to claim 3, characterized in that, Sealing lip includes: first sealing lip (82), second sealing lip (83) and third sealing lip (84) are abutted on screw rod (100) with interval, third sealing lip (84) is provided with clamping groove (841), and elastic ring (85) is installed in clamping groove (841).

5. The pre-tensioning structure for a lead screw of a CNC machine tool according to claim 3, wherein Annular groove (811) is formed in outer sealing portion (81), first protrusion (11) is arranged on bearing seat body (1), second protrusion (21) is arranged on bearing seat gland (2), and first protrusion (11) and second protrusion (21) are oppositely arranged in groove (811).

6. The pre-tensioning structure for a lead screw of a CNC machine tool according to claim 1, wherein Second sealing assembly (7) is fixed by a pair of pressing plates (9), and a pair of pressing plates (9) are symmetrically installed in bearing gland (6).

7. The lead screw pre-tensioning structure for a numerical control machine tool according to claim 6, characterized in that, Second sealing assembly (7) includes fixed part (71), bending part (72) and plugging part (73), pressing plate (9) can be pressed on fixed part (71), and plugging part (73) can be abutted on bushing (4).

8. The pre-tensioning structure for a lead screw of a CNC machine tool according to claim 1, wherein Locking screw (20) is installed on locking nut (5), and locking screw (20) is abutted on screw rod (100).

9. The lead screw pre-tensioning arrangement for a CNC machine tool as claimed in claim 1, wherein, A plurality of limiting insertion holes (12) are formed in bearing seat body (1), and a plurality of limiting insertion rods (22) are arranged on bearing seat gland (2) and matched with corresponding limiting insertion holes (12).

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