Double-nut rolling ball screw pair

Abstract

The utility model discloses a double-nut rolling ball screw pair, which relates to the technical field of mechanical transmission and comprises a screw body, two nut bodies are sleeved on the outer surface of the screw body in a threaded manner, a mounting block is arranged above the outer surface of each nut body, an inserting plate is fixedly arranged at one end of one of the nut bodies, and the other end of one of the nut bodies is provided with an inserting groove. One end of the other nut body is fixedly provided with a clamping block, the upper end of the clamping block is provided with a plate groove used in cooperation with the inserting plate, the two ends of the inserting plate and the two ends of the clamping block are each provided with a penetrating type fixing groove, long bolts are movably inserted into the fixing grooves, and one ends of the long bolts penetrate through the inserting plate and the clamping block and are in threaded connection with nuts in a sleeved mode. According to the double-nut rolling ball screw pair, the two nuts are stably connected in the axial direction of the screw, and the nuts can be effectively prevented from loosening, shifting or relatively rotating in the working process.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical transmission, and particularly relates to a double-nut rolling ball screw pair. Background Art

[0002] The double-nut rolling ball screw pair is a mechanical transmission component, which consists of a screw rod, balls and double nuts. It uses the balls to roll between the screw thread groove of the screw rod and the raceway of the nut, changing the sliding friction into rolling friction. Its advantages include high precision. The preloading of the double nuts can reduce the backlash and ensure the positive and negative movement precision. Secondly, it has high rigidity, enhancing the axial rigidity and being able to withstand large axial loads. Then it has high efficiency. The rolling friction results in small friction loss and high transmission efficiency.

[0003] However, the existing technology still has the following problems:

[0004] For the double-nut rolling ball screw pair of the existing technology, the connection stability between most double nuts needs to be improved. The existing connection methods of double nuts are usually relatively simple, and may only rely on a single connection structure, such as only through threaded connection or ordinary clamping structure. This kind of connection is prone to looseness during long-term use, especially during high-speed operation, frequent start and stop or under large loads. In some automated production equipment, due to the continuous operation and vibration of the equipment, the connection between the double nuts may gradually become loose, resulting in the reduction of the transmission precision of the ball screw pair and affecting the quality of the produced products.

[0005] In view of the above problems, the inventor proposes a double-nut rolling ball screw pair to solve the above problems. Content of the Utility Model

[0006] In order to solve the problem that the connection stability between double nuts needs to be improved; the purpose of the utility model is to provide a double-nut rolling ball screw pair.

[0007] To solve the above technical problems, the utility model adopts the following technical scheme: a double-nut rolling ball screw pair, including a screw rod body, two nut bodies are threadedly sleeved on the outer surface of the screw rod body. An installation block is arranged above the outer surface of the nut body, and components that need to perform linear motion can be installed on the installation block. One end of one of the nut bodies is fixedly provided with an insertion plate, and one end of the other nut body is fixedly provided with a clamping block. A plate groove for cooperating with the insertion plate is opened at the upper end of the clamping block. Through-type fixing grooves are opened at both ends of the insertion plate and the clamping block, and a long bolt is movably inserted into the fixing groove. One end of the long bolt penetrates through the insertion plate and the clamping block and is threadedly sleeved with a nut.

[0008] Preferably, a support plate is fixedly provided on the upper side of the outer surface of the nut body. An installation plate is fixedly provided at the upper end of the support plate. The upper end of the installation plate is in contact with the lower end of the installation block. The installation block can be installed and disassembled on the installation plate. Grooves are formed at both ends of the installation block, and the lower inner wall of the groove is connected with the corresponding installation plate through bolts. Three bolts are arranged in the groove to fix the installation plate, so the connection is more firm.

[0009] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0010] 1. Through the cooperation of the insertion plate, the clamping block, the long bolt and the nut, and the connection between the insertion post and the sleeve, the present utility model realizes the stable connection of two nut bodies along the axial direction of the lead screw, effectively preventing the nuts from loosening, shifting or relatively rotating during work, and improving the overall stability and reliability of the ball screw pair. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0012] Figure 1 It is a schematic diagram of the overall structure of the present utility model.

[0013] Figure 2 It is an exploded view of the structure at the connection of two nut bodies of the present utility model.

[0014] Figure 3 It is an exploded view of the installation block and some related structures of the present utility model.

[0015] In the figure: 1. Lead screw body; 2. Nut body; 21. Insertion plate; 22. Clamping block; 23. Plate groove; 24. Fixed groove; 25. Long bolt; 26. Nut; 27. Sleeve; 28. Insertion post; 3. Installation block; 31. Support plate; 32. Installation plate; 33. Groove; 34. Bolt groove; 35. Connecting plate; 36. Clamping strip; 37. Clamping groove; 38. Positioning post; 39. Positioning groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0017] Embodiment 1: As Figures 1 - 3 shown, the present utility model provides a double-nut rolling ball screw pair, including a screw rod body 1. Two nut bodies 2 are threadedly sleeved on the outer surface of the screw rod body 1. An installation block 3 is arranged above the outer surface of the nut body 2. Bolt grooves 34 are opened on both sides of the upper end of the installation block 3. One end of one nut body 2 is fixedly provided with an insertion plate 21, and one end of the other nut body 2 is fixedly provided with a clamping block 22. A plate groove 23 for cooperating with the insertion plate 21 is opened at the upper end of the clamping block 22. Through holes 24 are opened at both ends of the insertion plate 21 and the clamping block 22, and a long bolt 25 is movably inserted into the through hole 24. One end of the long bolt 25 penetrates through the insertion plate 21 and the clamping block 22 and is threadedly sleeved with a nut 26. The screw rod body 1 and the two nut bodies 2 form a double-nut ball screw structure. The bolt grooves 34 on the installation block 3 can be bolted and connected with the components to be moved. The insertion plate 21 at one end of one nut body 2 is inserted into the plate groove 23 on the clamping block 22 at one end of the other nut body 2. The long bolt 25 penetrates through the through holes 24 at both ends of the insertion plate 21 and the clamping block 22, and the nut 26 is screwed on for fixation. In this way, the two nut bodies 2 are initially connected and positioned in the axial direction.

[0018] A plurality of sleeves 27 are fixedly arranged at one end of one nut body 2, and a plurality of insertion posts 28 are fixedly arranged at one end of the other nut body 2. One end of the insertion post 28 is movably inserted into the sleeve 27. There are three sleeves 27 and insertion posts 28, and the three sleeves 27 and insertion posts 28 are annularly distributed. At the same time, the plurality of insertion posts 28 on one nut body 2 are inserted into the sleeves 27 on the other nut body 2. Since the sleeves 27 and the insertion posts 28 are annularly distributed and there are three of them, the stability of the two nut bodies 2 in the axial and circumferential directions is further enhanced, preventing the nuts from relatively rotating or shifting during the rotation of the screw rod. Through the cooperation of the insertion plate 21 and the clamping block 22, the long bolt 25 and the nut 26, and the connection between the insertion post 28 and the sleeve 27, the stable connection of the two nut bodies 2 along the axial direction of the screw rod is realized, effectively preventing the nuts from loosening, shifting or relatively rotating during the work, and improving the overall stability and reliability of the ball screw pair.

[0019] Embodiment 2: As Figures 1 - 3As shown, a support plate 31 is fixedly provided on the upper side of the outer surface of the nut body 2. The upper end of the support plate 31 is fixedly provided with a mounting plate 32. The upper end of the mounting plate 32 is in contact with the lower end of the mounting block 3. Grooves 33 are formed at both ends of the mounting block 3, and the lower inner wall of the groove 33 is connected to the corresponding mounting plate 32 by bolts. A clamping strip 36 is fixedly provided at the upper end of the mounting plate 32, and a clamping groove 37 for using the clamping strip 36 is formed at the lower end of the mounting block 3. Four positioning columns 38 are fixedly provided at the lower end of the mounting block 3, and four positioning grooves 39 for using the positioning columns 38 are formed at the upper end of the mounting plate 32. The support plate 31 on the upper side of the outer surface of the nut body 2 plays a role in supporting the mounting plate 32. The clamping strip 36 at the upper end of the mounting plate 32 is inserted into the clamping groove 37 at the lower end of the mounting block 3, and the positioning column 38 at the lower end of the mounting block 3 is inserted into the positioning groove 39 at the upper end of the mounting plate 32, realizing the quick positioning of the mounting block 3 and the mounting plate 32. Then, the lower inner wall of the groove 33 and the mounting plate 32 are connected by bolts to further fix the mounting block 3 and the nut body 2, ensuring the stability of the double-nut structure during the operation of the ball screw pair.

[0020] Both ends of the two mounting blocks 3 are jointly connected by bolts to a connecting plate 35, and the inner walls on both sides of the connecting plate 35 are respectively in contact with the inner walls of the two grooves 33. The two mounting blocks 3 are further connected by bolts through the connecting plate 35, making the overall structure of the two nut bodies 2 more stable.

[0021] Working principle: The screw rod body 1 and the two nut bodies 2 form a double-nut ball screw structure. The bolt groove 34 on the mounting block 3 can be bolt-connected to the component to be moved. The insertion plate 21 at one end of one nut body 2 is inserted into the plate groove 23 on the clamping block 22 at one end of the other nut body 2. A long bolt 25 passes through the fixing grooves 24 at both ends of the insertion plate 21 and the clamping block 22, and a nut 26 is screwed on for fixation, so that the two nut bodies 2 are initially connected and positioned in the axial direction.

[0022] At the same time, a plurality of insertion posts 28 on one nut body 2 are inserted into the sleeve 27 on the other nut body 2. Since the sleeve 27 and the insertion posts 28 are annularly distributed and there are three of them, the stability of the two nut bodies 2 in the axial and circumferential directions is further enhanced, preventing relative rotation or offset of the nut during the rotation of the screw rod. Through the cooperation of the insertion plate 21 and the clamping block 22, the long bolt 25 and the nut 26, and the connection between the insertion posts 28 and the sleeve 27, the stable connection of the two nut bodies 2 in the axial direction along the screw rod is realized, effectively preventing the nut from loosening, offsetting or relatively rotating during operation, and improving the overall stability and reliability of the ball screw pair.

[0023] The support plate 31 on the upper side of the outer surface of the nut body 2 serves to support the mounting plate 32. The clamping strip 36 at the upper end of the mounting plate 32 is inserted into the card slot 37 at the lower end of the mounting block 3, and the positioning post 38 at the lower end of the mounting block 3 is inserted into the positioning slot 39 at the upper end of the mounting plate 32 to achieve the rapid positioning of the mounting block 3 and the mounting plate 32. Then, the lower inner wall of the groove 33 is connected to the mounting plate 32 through bolts to further fix the mounting block 3 and the nut body 2, ensuring the stability of the double-nut structure during the operation of the ball screw pair;

[0024] Both ends of the two mounting blocks 3 are further connected by bolts through the connecting plate 35, making the two nut bodies 2 more stable in the overall structure.

[0025] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and its equivalent technologies, the present invention also intends to include these modifications and variations.

Claims

1. A double-nut rolling ball screw pair, comprising a screw rod body (1), characterized in that: The outer surface of the screw rod body (1) is threadedly sleeved with two nut bodies (2). Above the outer surface of the nut body (2), there is an installation block (3). One end of one of the nut bodies (2) is fixedly provided with an insertion plate (21), and one end of the other nut body (2) is fixedly provided with a clamping block (22). At the upper end of the clamping block (22), a plate groove (23) for cooperating with the insertion plate (21) is opened. Through holes (24) are opened at both ends of the insertion plate (21) and the clamping block (22), and a long bolt (25) is movably inserted into the through hole (24). One end of the long bolt (25) penetrates through the insertion plate (21) and the clamping block (22) and is threadedly sleeved with a nut (26).

2. The double-nut rolling ball screw pair according to claim 1, characterized in that: On the upper side of the outer surface of the nut body (2), a support plate (31) is fixedly provided. At the upper end of the support plate (31), a mounting plate (32) is fixedly provided. The upper end of the mounting plate (32) is in contact with the lower end of the installation block (3). Grooves (33) are opened at both ends of the installation block (3), and the lower inner wall of the groove (33) and the corresponding mounting plate (32) are connected by bolts in cooperation.

3. A double-nut rolling ball screw pair as described in claim 1, characterized in that: One end of one of the nut bodies (2) is fixedly provided with a plurality of sleeves (27), and one end of the other nut body (2) is fixedly provided with a plurality of insertion posts (28). One end of the insertion post (28) is movably inserted into the sleeve (27).

4. The double-nut rolling ball screw pair according to claim 3, characterized in that: Both the sleeve (27) and the insertion post (28) are provided with three, and the three sleeves (27) and insertion posts (28) are distributed in a ring shape.

5. A double-nut rolling ball screw pair according to claim 2, characterized in that: Bolt grooves (34) are opened on both sides of the upper end of the installation block (3).

6. The double-nut rolling ball screw pair according to claim 2, characterized in that: Both ends of the two installation blocks (3) are jointly connected by bolts in cooperation with a connecting plate (35), and the inner walls on both sides of the connecting plate (35) are respectively in contact with the inner walls of the two grooves (33).

7. The double-nut rolling ball screw pair according to claim 2, characterized in that: At the upper end of the mounting plate (32), a clamping strip (36) is fixedly provided, and at the lower end of the installation block (3), a card slot (37) for cooperating with the clamping strip (36) is opened.

8. A double-nut rolling ball screw pair according to claim 2, characterized in that: Four positioning posts (38) are fixedly provided at the lower end of the installation block (3), and four positioning grooves (39) for cooperating with the positioning posts (38) are opened at the upper end of the mounting plate (32).

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