Linear thrust device

Abstract

The utility model discloses a linear thrust device which comprises a support and a thrust conversion assembly, a lead screw is movably arranged in the support, the upper end of the lead screw penetrates through the thrust conversion assembly and is in threaded connection with the thrust conversion assembly, the thrust conversion assembly is used for converting rotary motion of the lead screw into linear motion, and the linear thrust device further comprises a guide rod. The guide rod penetrates through the lead screw in the radial direction of the lead screw, first bearings are arranged at the two ends of the guide rod, guide rails in sliding fit with the first bearings are arranged on the two sides of the support, the guide rails are arranged in the Z-axis direction of the support, the lead screw can move in the Z-axis direction of the support relative to the support, and the first bearings are arranged in the guide rails. And the first bearing is limited in the X-axis direction and the Y-axis direction of the support, so that the freedom degree of the lead screw in the X-axis direction and the Y-axis direction of the support is limited, the design of double guide rails is adopted, multi-point constraint is formed on the guide rod, radial run-out and deflection of the lead screw in the movement process are reduced, and the precision and stability of linear movement are improved.

Description

Technical Field

[0001] This utility model relates to the field of thrust device technology, and in particular to a linear thrust device. Background Technology

[0002] A linear thrust device is a mechanical device that converts power (such as rotational motion) into linear motion. Its function is to generate thrust or pull along a straight line. As a common mechanical transmission component, linear thrust devices are widely used in various mechanical equipment. Currently, the most common linear thrust devices on the market are mainly designed based on the screw drive principle. Their working principle is that the rotational motion of the screw, utilizing the helical characteristics of the thread, converts rotational motion into linear motion, thereby achieving thrust output. However, in practical applications, especially under high-speed operation or long-stroke motion conditions, conventional screws are prone to trajectory deviation due to vibration, resulting in low accuracy and difficulty meeting the requirements of high-precision applications. Therefore, improvements are necessary. Utility Model Content

[0003] The purpose of this utility model is to address the defects and shortcomings of the existing technology by providing a linear thrust device with a simple and reasonable structure and convenient operation. The guide rod passes through the lead screw radially, and the two ends of the guide rod are provided with first bearings. The two sides of the bracket are provided with guide rails that slide with the first bearings. The double guide rail design forms multi-point constraints on the guide rod, thereby limiting the degree of freedom of the lead screw in the X-axis and Y-axis directions of the bracket, reducing the radial runout and wobble of the lead screw during the movement, and improving the accuracy and stability of linear motion.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] The present invention discloses a linear thrust device, comprising a support and a thrust conversion assembly. A lead screw is movably disposed within the support, the upper end of which passes through the thrust conversion assembly and is threadedly connected to it. The thrust conversion assembly converts the rotational motion of the lead screw into linear motion. The device also includes a guide rod that passes radially through the lead screw. First bearings are disposed at both ends of the guide rod. Guide rails that slide against the first bearings are disposed on both sides of the support. The guide rails are arranged along the Z-axis of the support. The lead screw can move relative to the support in the Z-axis direction. The first bearings are disposed within the guide rails and are limited in the X and Y axes of the support, thereby restricting the degree of freedom of the lead screw in the X and Y axes of the support.

[0006] Furthermore, the thrust conversion assembly includes an actuator base, a drive sleeve, and a second bearing. The actuator base is fixedly connected to the bracket, and the drive sleeve and the second bearing are movably disposed inside the actuator base. The second bearing is sleeved on the outside of the drive sleeve and contacts and engages with the drive sleeve. The upper end of the lead screw is provided with a threaded section, and the inner wall of the drive sleeve is threadedly connected to the threaded section. The drive sleeve is used to convert the rotational motion of the lead screw into linear motion.

[0007] Furthermore, a first disc spring assembly that cooperates with a lead screw is provided in the upper end of the bracket. The lead screw passes through the first disc spring assembly and is limited to the first disc spring assembly. The upper end of the first disc spring assembly abuts against the thrust conversion assembly.

[0008] Furthermore, the first disc spring assembly includes a disc spring upper pad, a first disc spring washer, a second disc spring washer, and a first bushing arranged sequentially from top to bottom. The upper end of the disc spring upper pad abuts against the thrust conversion assembly, and the inner wall of the bracket is provided with a limiting step that cooperates with the limiting step of the first bushing.

[0009] Furthermore, a pressure plate is fixedly connected to the lower end of the bracket, and a second disc spring assembly that cooperates with the lead screw is provided inside the lower end of the bracket. The lead screw passes through the second disc spring assembly and is limited to cooperate with the second disc spring assembly. The lower end of the second disc spring assembly abuts against the pressure plate.

[0010] Furthermore, the second disc spring assembly includes a second bushing, a third disc spring washer, and a fourth disc spring washer arranged sequentially from top to bottom. The second bushing is provided with a stepped portion that cooperates with the bracket for limiting. The pressure plate is provided with a mounting groove for installing the second disc spring assembly.

[0011] Furthermore, the guide rod is provided with a first nut and a second nut, which are respectively located on both sides of the lead screw and fixedly connected to the lead screw.

[0012] Furthermore, the bracket is provided with a through hole along the axial direction for the lead screw to pass through, and the lead screw is provided with a through hole along the radial direction for the guide rod to pass through.

[0013] Furthermore, the first bearing is a deep groove ball bearing.

[0014] Furthermore, a protrusion is provided in the middle of the lead screw, the radius of which is larger than the radii of both ends of the lead screw. The protrusion is matched with the two ends of the bracket to limit the movement range of the lead screw in the Z-axis direction of the bracket.

[0015] The beneficial effects of this utility model are as follows: The linear thrust device of this utility model is provided with a guide rod that passes through the lead screw radially to ensure the stability of the lead screw during movement. First bearings are provided at both ends of the guide rod, and guide rails that slide with the first bearings are provided on both sides of the support. By adopting a double guide rail design, multi-point constraints are formed on the guide rod, thereby limiting the degree of freedom of the lead screw in the X-axis and Y-axis directions of the support, restricting the rotational movement of the lead screw, and retaining only the linear movement of the lead screw in the Z-axis direction of the support. This effectively reduces radial runout and yaw of the lead screw during movement, improving the accuracy and stability of linear motion.

[0016] The lead screw has a protrusion in the middle, the radius of which is larger than the radii of both ends of the lead screw. A first disc spring assembly is installed in the upper end of the bracket, and a second disc spring assembly is installed in the lower end of the bracket. Both the first and second disc spring assemblies are elastic. When the lead screw moves into position, the first and second disc spring assemblies can effectively play a buffering role, thereby reducing mechanical impact and extending the service life of the device. In addition, the protrusion cooperates with the first and second disc spring assemblies respectively to limit the movement range of the lead screw in the Z-axis direction of the bracket. Attached Figure Description

[0017] Figure 1 This is a structural schematic diagram of the present invention from a first-view perspective;

[0018] Figure 2 This is a structural schematic diagram of the present invention from a second perspective;

[0019] Figure 3 This is a structural schematic diagram of the present invention from a third-person perspective;

[0020] Figure 4 This is a cross-sectional structural diagram of the present invention from a third-person perspective;

[0021] Figure 5 This is a cross-sectional structural diagram of the present invention from a second perspective;

[0022] Figure 6 This is an exploded structural diagram of the present invention.

[0023] Figures 1-6In the middle: 1. Bracket; 11. Guide rail; 12. Limiting step; 13. Through hole; 2. Thrust conversion assembly; 21. Actuator base; 22. Drive sleeve; 23. Second bearing; 3. Lead screw; 31. Threaded section; 32. Protrusion; 4. Guide rod; 41. First bearing; 42. First nut; 43. Second nut; 44. Retaining ring; 5. First disc spring assembly; 51. Disc spring upper washer; 52. First disc spring washer; 53. Second disc spring washer; 54. First bushing; 6. Pressure plate; 61. Mounting groove; 7. Second disc spring assembly; 71. Second bushing; 711. Step; 72. Third disc spring washer; 73. Fourth disc spring washer. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings.

[0025] like Figures 1-6 The illustrated linear thrust device includes a support 1 and a thrust conversion assembly 2. A lead screw 3 is movably disposed within the support 1. The upper end of the lead screw 3 passes through the thrust conversion assembly 2 and is threadedly connected to it. The thrust conversion assembly 2 converts the rotational motion of the lead screw 3 into linear motion. It also includes a guide rod 4, which passes radially through the lead screw 3 to ensure the stability of the lead screw 3 during movement. (See reference...) Figure 1 The guide rod 4 has first bearings 41 at both ends, and the bracket 1 has guide rails 11 on both sides that slide with the first bearings 41. Preferably, in this embodiment, the first bearing 41 is a deep groove ball bearing with a low coefficient of friction, which can effectively reduce friction and provide smooth movement. See reference. Figure 6 The guide rod 4 is also provided with a retaining ring 44 that fits tightly with the first bearing 41 to prevent the first bearing 41 from disengaging undesirably and affecting its use. The guide rail 11 is set along the Z-axis direction of the bracket 1. The lead screw 3 can move relative to the bracket 1 in the Z-axis direction of the bracket 1. The first bearing 41 is set in the guide rail 11 and can slide along the Z-axis direction of the bracket 1. The first bearing 41 is limited in the X-axis and Y-axis directions of the bracket 1. By adopting the design of double guide rail 11, multi-point constraints are formed on the guide rod 4, thereby limiting the degree of freedom of the lead screw 3 in the X-axis and Y-axis directions of the bracket 1, restricting the rotational movement of the lead screw 3, and retaining only the linear movement of the lead screw 3 in the Z-axis direction of the bracket 1. This can effectively reduce the radial runout and wobble of the lead screw 3 during the movement process and improve the accuracy and stability of the linear movement.

[0026] Preferably, in this embodiment, the bracket 1 is provided with a through hole 13 along the axial direction for the lead screw 3 to pass through, and the lead screw 3 is provided with a through hole along the radial direction for the guide rod 4 to pass through. It should be noted that in this embodiment, the X-axis direction of the bracket 1 is consistent with the axial direction of the lead screw 3.

[0027] The thrust conversion assembly 2 of this utility model is connected to the actuator. Preferably, in this embodiment, the thrust conversion assembly 2 includes an actuator base 21, a drive sleeve 22, and a second bearing 23. The actuator base 21 is fixedly connected to the bracket 1 to ensure a stable and reliable connection. The drive sleeve 22 and the second bearing 23 are movably disposed within the actuator base 21. The second bearing 23 is sleeved on the outside of the drive sleeve 22 and contacts and cooperates with the drive sleeve 22. The thrust conversion assembly 2 is connected to the output shaft of the actuator through the drive sleeve 22 to transmit the rotational motion and torque from the actuator. (See reference...) Figures 4-5 The upper end of the lead screw 3 is provided with a threaded section 31, and the inner wall of the drive sleeve 22 is threadedly connected to the threaded section 31. The drive sleeve 22 is used to convert the rotational motion of the lead screw 3 into linear motion. The end of the lead screw 3 is connected to an adjusting valve, and the opening degree of the adjusting valve is controlled by controlling the movement of the lead screw 3 in the Z-axis direction of the bracket 1.

[0028] Preferably, in this embodiment, refer to Figure 2 The lead screw 3 has a protrusion 32 in the middle, the radius of which is greater than the radius of both ends of the lead screw 3. The protrusion 32 is matched with the two ends of the bracket 1 for limiting the movement range of the lead screw 3 in the Z-axis direction of the bracket 1.

[0029] Preferably, in this embodiment, refer to Figure 6 The upper end of the bracket 1 is provided with a first disc spring assembly 5 that cooperates with the lead screw 3. The first disc spring assembly 5 is elastic. The lead screw 3 passes through the first disc spring assembly 5 and is limited to the first disc spring assembly 5. The upper end of the first disc spring assembly 5 abuts against the thrust conversion assembly 2. Specifically, the first disc spring assembly 5 is limited to the protrusion 32. When the lead screw 3 moves into position, the first disc spring assembly 5 can effectively play a buffering role, thereby reducing mechanical impact and extending the service life of the device.

[0030] Preferably, in this embodiment, refer to Figure 6 The first disc spring assembly 5 includes a disc spring upper pad 51, a first disc spring washer 52, a second disc spring washer 53, and a first bushing 54 arranged sequentially from top to bottom. The upper end of the disc spring upper pad 51 abuts against the thrust conversion assembly 2. The inner wall of the bracket 1 is provided with a limiting step 12 that cooperates with the first bushing 54 to limit the movement. When the lead screw 3 moves into position, the protrusion 32 abuts against the first bushing 54. By compressing the first disc spring washer 52, the second disc spring washer 53, and the disc spring upper pad 51, the cushioning effect is effectively achieved.

[0031] Preferably, in this embodiment, refer to Figure 6The lower end of the bracket 1 is fixedly connected to a pressure plate 6. A second disc spring assembly 7 that cooperates with the lead screw 3 is provided inside the lower end of the bracket 1. The second disc spring assembly 7 is elastic. The lead screw 3 passes through the second disc spring assembly 7 and is limited to the second disc spring assembly 7. The lower end of the second disc spring assembly 7 abuts against the pressure plate 6. Specifically, the second disc spring assembly 7 is limited to the protrusion 32. When the lead screw 3 moves into position, the second disc spring assembly 7 can effectively play a buffering role, thereby reducing mechanical impact and extending the service life of the device.

[0032] Preferably, in this embodiment, refer to Figure 6 The second disc spring assembly 7 includes a second bushing 71, a third disc spring washer 72, and a fourth disc spring washer 73 arranged sequentially from top to bottom. The second bushing 71 has a stepped portion 711 that engages with the bracket 1 for limiting, thus serving a limiting function. The second bushing 71 is designed as a long bushing to enhance its stability and support capacity. The pressure plate 6 has an installation groove 61 for installing the second disc spring assembly 7, ensuring stable and reliable installation. When the lead screw 3 moves into position, the protrusion 32 abuts against the second bushing 71, effectively buffering the movement by compressing the third disc spring washer 72 and the fourth disc spring washer 73.

[0033] Preferably, in this embodiment, refer to Figure 2 The guide rod 4 is provided with a first nut 42 and a second nut 43. The first nut 42 and the second nut 43 are respectively located on both sides of the lead screw 3 and are fixedly connected to the lead screw 3 to ensure a stable and reliable connection.

[0034] The above description is only a preferred embodiment of the present utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model patent application are included in the scope of the present utility model patent application.

Claims

1. A linear thrust device, comprising a support (1) and a thrust conversion assembly (2), wherein a lead screw (3) is movably disposed within the support (1), the upper end of the lead screw (3) passes through the thrust conversion assembly (2) and is threadedly connected to the thrust conversion assembly (2), the thrust conversion assembly (2) being used to convert the rotational motion of the lead screw (3) into linear motion, characterized in that: It also includes a guide rod (4), which passes through the lead screw (3) radially. The two ends of the guide rod (4) are provided with first bearings (41). The two sides of the bracket (1) are provided with guide rails (11) that slide with the first bearings (41). The guide rails (11) are provided along the Z-axis direction of the bracket (1). The lead screw (3) can move relative to the bracket (1) in the Z-axis direction of the bracket (1). The first bearing (41) is provided in the guide rail (11) and the first bearing (41) is limited in the X-axis and Y-axis directions of the bracket (1), thereby restricting the degree of freedom of the lead screw (3) in the X-axis and Y-axis directions of the bracket (1).

2. The linear thrust device according to claim 1, characterized in that: The thrust conversion assembly (2) includes an actuator base (21), a drive sleeve (22), and a second bearing (23). The actuator base (21) is fixedly connected to the bracket (1). The drive sleeve (22) and the second bearing (23) are movably disposed inside the actuator base (21). The second bearing (23) is sleeved on the outside of the drive sleeve (22) and contacts and cooperates with the drive sleeve (22). The upper end of the lead screw (3) is provided with a threaded section (31). The inner wall of the drive sleeve (22) is threadedly connected to the threaded section (31). The drive sleeve (22) is used to convert the rotational motion of the lead screw (3) into linear motion.

3. A linear thrust device according to claim 1, characterized in that: The upper end of the bracket (1) is provided with a first disc spring assembly (5) that cooperates with the lead screw (3). The lead screw (3) passes through the first disc spring assembly (5) and is limited to cooperate with the first disc spring assembly (5). The upper end of the first disc spring assembly (5) abuts against the thrust conversion assembly (2).

4. A linear thrust device according to claim 3, characterized in that: The first disc spring assembly (5) includes a disc spring upper pad (51), a first disc spring washer (52), a second disc spring washer (53) and a first bushing (54) arranged sequentially from top to bottom. The upper end of the disc spring upper pad (51) abuts against the thrust conversion assembly (2), and the inner wall of the bracket (1) is provided with a limiting step (12) that cooperates with the first bushing (54).

5. A linear thrust device according to claim 1, characterized in that: The lower end of the bracket (1) is fixedly connected to a pressure plate (6). The lower end of the bracket (1) is provided with a second disc spring assembly (7) that cooperates with the lead screw (3). The lead screw (3) passes through the second disc spring assembly (7) and is limited to cooperate with the second disc spring assembly (7). The lower end of the second disc spring assembly (7) abuts against the pressure plate (6).

6. A linear thrust device according to claim 5, characterized in that: The second disc spring assembly (7) includes a second bushing (71), a third disc spring washer (72) and a fourth disc spring washer (73) arranged sequentially from top to bottom. The second bushing (71) is provided with a step portion (711) that is matched with the bracket (1) for limiting. The pressure plate (6) is provided with a mounting groove (61) for installing the second disc spring assembly (7).

7. A linear thrust device according to claim 1, characterized in that: The guide rod (4) is provided with a first nut (42) and a second nut (43), which are respectively provided on both sides of the lead screw (3) and fixedly connected to the lead screw (3).

8. A linear thrust device according to claim 1, characterized in that: The bracket (1) is provided with a through hole (13) along the axial direction for the lead screw (3) to pass through, and the lead screw (3) is provided with a through hole along the radial direction for the guide rod (4) to pass through.

9. A linear thrust device according to claim 1, characterized in that: The first bearing (41) is a deep groove ball bearing.

10. A linear thrust device according to claim 1, characterized in that: The lead screw (3) has a protrusion (32) in the middle. The radius of the protrusion (32) is greater than the radius of both ends of the lead screw (3). The protrusion (32) is matched with the two ends of the bracket (1) to limit the movement range of the lead screw (3) in the Z-axis direction of the bracket (1).

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