Circulating precision platform

Abstract

This utility model relates to a circulating precision platform, including a base, a driven end assembly, a ball screw, a slide, a drive end assembly, a limiting assembly, and a motor. The driven end assembly and the drive end assembly are detachably fixed to both ends of the base. The two ends of the ball screw are respectively installed in the driven end assembly and the drive end assembly, with one end installed in the drive end assembly connected to the motor output shaft. The slide is fixedly connected to the nut of the ball screw by a pin. The limiting assembly is installed at both ends of the base. Compared with the prior art, this utility model has the advantage of the ball screw nut and the slide being fixedly connected by a pin, which improves the overall rigidity and makes it less likely for them to move relative to each other in vibration and impact scenarios. The driven end assembly is installed in the limiting groove, and the drive end assembly is detachably connected to the base, allowing for radial adjustment of its position as needed, ensuring smooth operation of the ball screw, and significantly reducing the precision requirements of the component dimensions.

Description

Technical Field

[0001] This utility model relates to a slide table, and more particularly to a circulating precision platform. Background Technology

[0002] In the field of precision platforms, repeatability and positioning accuracy are core parameters of product precision. Common precision platforms on the market have relatively weak rigidity, making them susceptible to changes in positional accuracy due to vibration and impact.

[0003] A search revealed that patent announcement number CN207879848U discloses a linear slide with a circulating function, which is a single-axis precision platform guided by ball bearing guides, with ball bearing nuts connected to the slide block via a limiting plate. This solution has the following drawbacks:

[0004] 1. The ball nut and the slide block maintain their relative position through friction, but they are prone to relative displacement after being subjected to vibration and impact.

[0005] 2. To ensure smooth operation of the ball screw, the coaxiality of the mating parts at both ends of the ball screw and the nut must be guaranteed after assembly, and the dimensional accuracy requirements of the relevant parts are high.

[0006] In summary, the technical problem that needs to be solved is how to design a cyclic precision platform with high positioning accuracy and low requirements for part dimensional accuracy. Utility Model Content

[0007] The purpose of this invention is to overcome the shortcomings of the prior art, such as low positional accuracy stability and high requirements for part dimensional accuracy, and to provide a cyclic precision platform.

[0008] The objective of this utility model can be achieved through the following technical solutions.

[0009] According to one aspect of the present invention, a cyclic precision platform is provided, comprising a base, a driven end assembly, a ball screw, a slide, a drive end assembly, a limiting assembly, and a motor; the driven end assembly and the drive end assembly are detachably fixed to both ends of the base, the two ends of the ball screw are respectively installed in the driven end assembly and the drive end assembly, and one end installed in the drive end assembly is connected to the output shaft of the motor; the slide is fixedly connected to the nut of the ball screw by a pin; the limiting assembly is installed at both ends of the base.

[0010] As a preferred technical solution, the driven end assembly includes a driven end block, a driven bearing, and a bearing housing; one end of the base is provided with a limiting groove, and the driven end block is located in the limiting groove; the driven bearing is installed in the bearing housing, and the end face of the bearing housing is fixed to the end face of the driven end block; one end of the ball screw is installed in the driven bearing.

[0011] As a preferred technical solution, the drive end assembly includes a first drive bearing, a drive end block, a second drive bearing, a lock nut, and a coupling; the drive end block is connected to the base, the first drive bearing is partially located inside the drive end block, the second drive bearing is entirely located inside the drive end block, and the second drive bearing is connected to the lock nut; one end of the ball screw passes through the first drive bearing, the second drive bearing, the lock nut, and one end of the coupling, and the other end of the coupling is connected to the motor output shaft.

[0012] As a preferred technical solution, the first drive bearing is close to the lead screw nut, and the second drive bearing is close to the motor; the drive end block is provided with a boss between the first drive bearing and the second drive bearing.

[0013] As a preferred technical solution, an end cover is installed on the end face of the first drive bearing near the ball screw, and the edge of the end cover is fixed on the drive end block; the drive end assembly is covered by a shell.

[0014] As a preferred technical solution, the base is provided with two protrusions extending along the axial direction of the ball screw, and the ball screw is located between the two protrusions; the sides of the two protrusions away from the ball screw are provided with slide rails along the axial direction of the ball screw; the slide seat is provided with slide grooves on both sides, and one slide groove cooperates with one slide rail.

[0015] As a preferred technical solution, the limiting component includes two limiting sensors, which are respectively installed at both ends of the base and located between the driven end component and the driving end component; a light-shielding plate is installed on one side of the nut of the ball screw, and the light-shielding plate blocks the light emitted by the limiting sensors when it is located between the limiting sensors.

[0016] As a preferred technical solution, the limit sensor is connected to the surface of the base away from the lead screw nut via a mounting plate and screws.

[0017] As a preferred technical solution, the limiting component includes two limiting screws, which are respectively installed at both ends of the base and located between the driven end component and the driving end component.

[0018] As a preferred technical solution, the pins of the nut connecting the slide and the ball screw are one or two. When there is one pin, it is distributed at the center of the table. When there are two pins, they are arranged radially along the ball screw and / or axially along the ball screw (6).

[0019] Compared with the prior art, the present invention has the following beneficial effects.

[0020] 1) The nut and slide of the ball screw of this utility model are fixedly connected by a pin, which improves the overall rigidity and makes it less likely for the two to move relative to each other in the case of vibration and impact. The driven end component is installed in the limiting groove, and the drive end component is detachably connected to the base. The position can be adjusted radially as needed, which ensures smooth operation of the ball screw and greatly reduces the accuracy requirements of the component size.

[0021] 2) When the locking nut of this utility model is tightened, the outer rings of the first drive bearing and the second drive bearing are tightly fitted with the boss of the inner hole of the drive end block. The first drive bearing and the second drive bearing are pressed together by the locking nut, and the gap between the ball and the raceway is eliminated, thereby ensuring axial accuracy.

[0022] 3) The limit sensor of this utility model is installed at both ends of the base. A light shield is installed on one side of the ball screw nut. The light shield blocks the limit sensor and generates a limit signal, which can accurately limit the ball screw nut. Two limit screws are set on the base to reliably limit the ball screw nut mechanically and prevent the platform from being damaged when it fails and loses power.

[0023] 4) The base and slide of this utility model are matched by the slide groove and the slide rail, which can not only improve the running stability of the slide and ensure the linear accuracy of the slide, but also help improve the linear accuracy of the ball screw.

[0024] 5) The present invention has at least two pins, which are arranged radially and / or axially along the ball screw to assist in the positioning of the ball screw and make it easier to obtain better linear accuracy. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of a cyclic precision platform according to the present invention.

[0026] Figure 2 This is an exploded view of a cyclic precision platform according to the present invention.

[0027] Figure 3 This is a first cross-sectional view along the axial direction of the ball screw of a circulating precision platform according to the present invention.

[0028] Figure 4 This is a first cross-sectional view along the radial direction of the ball screw of a circulating precision platform according to the present invention.

[0029] Figure 5 This is a second sectional view along the axial direction of the ball screw of a circulating precision platform according to the present invention.

[0030] Figure 6 This is a second cross-sectional view along the radial direction of the ball screw of a cyclic precision platform according to the present invention.

[0031] The numbers in the diagram are as follows:

[0032] 1. Limit sensor, 2. Base, 3. Driven end block, 4. Driven bearing, 5. Bearing housing, 6. Ball screw, 7. Light shield, 8. Slide, 9. Pin, 10. First drive bearing, 11. Drive end block, 12. Second drive bearing, 13. Locking nut, 14. Coupling, 15. Motor. Detailed Implementation

[0033] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. This embodiment is based on the technical solution of the present invention and provides detailed implementation methods and specific operating procedures; however, the scope of protection of the present invention is not limited to the following embodiments.

[0034] This utility model provides a circulating precision platform, including a base 2, a driven end assembly, a ball screw 6, a slide 8, a drive end assembly, a limit assembly, and a motor 15.

[0035] like Figure 2 , Figure 4 As shown, the base 2 is U-shaped and includes two protrusions extending along the ball screw 6. The interior of the two protrusions forms an accommodating space, and the bottom of the accommodating space is provided with a limiting groove. The outer sides of the two protrusions are provided with slide rails.

[0036] like Figure 2 , Figure 3 As shown, the driven end assembly includes a driven end block 3, a driven bearing 4, and a bearing housing 5. The driven end block 3 is installed in a limiting groove and its position can be adjusted radially along the ball screw 6. The driven bearing 4 is installed in the bearing housing 5, and the end face of the bearing housing 5 is fixed to the end face of the driven end block 3. One end of the ball screw 6 is installed in the driven bearing 4.

[0037] like Figure 2 , Figure 4 As shown, the ball screw 6 is located entirely within the accommodating space of the base 2, including the screw and nut.

[0038] like Figure 4 , Figure 6 As shown, the slide 8 is fixed to the nut surface of the ball screw 6 by pins 9. In vibration and impact scenarios, the two are not prone to relative movement. There can be one or two pins 9, which can be arranged along the axial or radial direction of the ball screw 6 to assist in the positioning of the ball screw 6 and improve the linear accuracy of the ball screw 6. The slide 8 has grooves on both sides, and the two grooves respectively cooperate with the slide rails on the outer sides of the two protrusions of the base 2, which improves the running stability of the slide 8 and ensures the linear accuracy of the slide 8.

[0039] like Figure 2 , Figure 3As shown, the drive end assembly includes a first drive bearing 10, a drive end block 11, a second drive bearing 12, a lock nut 13, a coupling 14, an end cover, and a housing. The drive end block 11 is connected to one end of the base 2 by screws, and its position can be adjusted radially along the ball screw 6. The drive end block 11 has an internal hole. The first drive bearing 10 is close to the screw nut, and the second drive bearing 12 is close to the motor 15. The lock nut 13 is installed on the side of the second drive bearing 12 near the motor 15. The other end of the ball screw 6 passes sequentially through the first drive bearing 10, the second drive bearing 12, the lock nut 13, and one end of the coupling 14. The other end of the coupling 14 is connected to the output shaft of the motor 15.

[0040] like Figure 3 As shown, a portion of the first drive bearing 10 is located inside the inner hole, and the entire second drive bearing 12 is located inside the inner hole. The drive end block 11 has a boss at the position between the first drive bearing 10 and the second drive bearing 12. When the locking nut 13 is tightened, the outer rings of the first drive bearing 10 and the second drive bearing 12 are tightly fitted with the boss in the inner hole of the drive end block 11, and the inner rings of the first drive bearing 10 and the second drive bearing 12 are pressed together by the locking nut 13. The gap between the ball and the raceway is eliminated, thereby ensuring axial accuracy.

[0041] like Figure 2 , Figure 3 As shown, an end cover is installed on the end face of the first drive bearing 10 near the driven end assembly, and the edge of the end cover is fixed to the drive end block 11; the drive end assembly is covered by a cover; the end cover and the cover can protect the drive end assembly and prevent foreign objects or external forces from damaging the drive end assembly.

[0042] like Figure 3 As shown, the limiting assembly includes two limit sensors 1 and two limit screws. Figure 5 As shown, the base 2 has two mounting slots at both ends within its accommodating space. These two mounting slots are located between the drive end assembly and the limiting groove. The two limit sensors 1 are mounted in the mounting slots respectively using mounting plates and screws. Figure 4 As shown, a light-shielding plate 7 is installed on one side of the nut of the ball screw 6. When the nut of the ball screw 6 moves to both ends of the base 2, and the light-shielding plate 7 is located between the limit sensors 1, it blocks the light emitted by the limit sensors 1, thereby generating a limit signal and electronically limiting the movement of the nut of the ball screw 6. Two limit screws are fixed to the bottom surface of the accommodating space. When the nut of the ball screw 6 moves to both ends of the base 2, they mechanically limit the movement of the nut of the ball screw 6, restricting its movement between the two screws.

[0043] During installation, this invention ensures smooth operation of the ball screw 6 by radially adjusting the positions of the bearing housing 5 and the drive end block 11. This design significantly reduces the dimensional accuracy requirements of the components. Typically, the slide 8 is first moved close to the driven end block 3, and the relevant screws on the driven end block 3 and bearing housing 5 are pre-tightened. Then, the slide 8 is moved close to the drive end block 11, and the relevant screws on the drive end block 11 are pre-tightened. Finally, the screws on the nut of the ball screw 6 are pre-tightened. These steps are repeated to check if the ball screw 6 operates smoothly. If it does, the relevant screws are tightened according to the above steps. The debugging process is simple and easy to operate.

[0044] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A cyclic precision platform, characterized in that, The system includes a base (2), a driven end assembly, a ball screw (6), a slide (8), a drive end assembly, a limit assembly, and a motor (15). The driven end assembly is installed in a limit groove at one end of the base (2). The drive end assembly is detachably fixed at the other end of the base (2). The two ends of the ball screw (6) are respectively installed in the driven end assembly and the drive end assembly. The end installed in the drive end assembly is connected to the output shaft of the motor (15). The slide (8) is fixedly connected to the nut of the ball screw (6) by a pin (9). The limit assembly is installed at both ends of the base (2).

2. The recirculating precision stage of claim 1, wherein, The driven end assembly includes a driven end block (3), a driven bearing (4), and a bearing housing (5); the driven end block (3) is located in a limiting groove; the driven bearing (4) is installed in the bearing housing (5), and the end face of the bearing housing (5) is fixed on the end face of the driven end block (3); one end of the ball screw (6) is installed in the driven bearing (4).

3. The recirculating precision stage of claim 1, wherein, The drive end assembly includes a first drive bearing (10), a drive end block (11), a second drive bearing (12), a lock nut (13), and a coupling (14); the drive end block (11) is connected to the base (2), the first drive bearing (10) is partially located inside the drive end block (11), the second drive bearing (12) is entirely located inside the drive end block (11), and the second drive bearing (12) is connected to the lock nut (13); one end of the ball screw (6) passes through one end of the first drive bearing (10), the second drive bearing (12), the lock nut (13), and the coupling (14), and the other end of the coupling (14) is connected to the output shaft of the motor (15).

4. The recirculating precision stage of claim 3, wherein, The first drive bearing (10) is close to the lead screw nut, and the second drive bearing (12) is close to the motor (15); the drive end block (11) has a boss between the first drive bearing (10) and the second drive bearing (12).

5. The recirculating precision stage of claim 3, wherein, An end cap is installed on the end face of the first drive bearing (10) near the ball screw (6), and the edge of the end cap is fixed on the drive end block (11); the drive end assembly is covered with a cover.

6. The recirculating precision stage of claim 1, wherein, The base (2) is provided with two protrusions extending along the axial direction of the ball screw (6), and the ball screw (6) is located between the two protrusions; the sides of the two protrusions away from the ball screw (6) are provided with slide rails along the axial direction of the ball screw (6); the slide seat (8) is provided with slide grooves on both sides, and one slide groove cooperates with one slide rail.

7. The recirculating precision stage of claim 1, wherein, The limiting component includes two limiting sensors (1), which are respectively installed at both ends of the base (2) and located between the driven end component and the driving end component; a light shield (7) is installed on one side of the nut of the ball screw (6), and the light shield (7) blocks the light emitted by the limiting sensor (1) when it is located between the limiting sensors (1).

8. The recirculating precision stage of claim 7, wherein, The limit sensor (1) is connected to the base (2) away from the surface of the lead screw nut by means of a mounting plate and screws.

9. The recirculating precision stage of claim 1, wherein, The limiting component includes two limiting screws, which are respectively installed at both ends of the base (2) and located between the driven end component and the driving end component.

10. The recirculating precision stage of claim 1, wherein, The pin (9) connecting the slide (8) and the nut of the ball screw (6) is one or two, the pin is one when distributing in the center of the table top, the pin is two when arranging along the radial direction of the ball screw (6) and / or arranging along the axial direction of the ball screw (6).

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