Two-stage electric cylinder lead screw

Abstract

The utility model relates to a two-stage electric cylinder screw rod which comprises a screw rod lead screw, a screw rod nut, a screw rod guide head, a hollow screw rod lead screw and a hollow screw rod nut. The lead screw nut is mounted on the lead screw to form a first-stage lead screw; the lead screw guide head is fixedly installed at the front end of the lead screw and serves as an adapter piece and a transmission piece between the lead screw and the hollow lead screw. The hollow lead screw nut is installed on the hollow lead screw lead screw, the hollow lead screw lead screw is arranged on the lead screw lead screw in a sleeved mode through the lead screw guide head, and the hollow lead screw lead screw is connected with the lead screw lead screw in a sliding mode through the lead screw guide head to form a secondary lead screw. According to the secondary electric cylinder lead screw, the lead screw guide head is fixed at the front end of the first-stage lead screw, and the lead screw guide head serves as an adapter and a transmission piece between the first-stage lead screw and the hollow lead screw, so that the secondary electric cylinder lead screw is achieved. The two-stage electric cylinder lead screw can be achieved only through five components, the structure is simpler, production and assembly are easier, and the production cost and the use cost are lower.

Description

Technical Field

[0001] This utility model relates to the field of transmission technology, specifically to a two-stage electric cylinder lead screw. Background Technology

[0002] A ball screw is a component that converts rotary motion into linear motion, consisting of a lead screw and a lead screw nut. A common ball screw structure typically uses a single lead screw and lead screw nut, known as a single-stage ball screw. The stroke of a single-stage ball screw is limited, and in some special applications, it cannot meet the requirements. Therefore, two-stage ball screws have emerged.

[0003] However, existing two-stage lead screw structures are generally quite complex and lack sufficient transmission stability, resulting in relatively high manufacturing and usage costs. Utility Model Content

[0004] The technical problem solved by this utility model is to provide a lead screw for a two-stage electric cylinder with a simple and reasonable structure and relatively low cost.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A two-stage electric cylinder lead screw includes a lead screw, a lead screw nut, a lead screw guide head, a hollow lead screw, and a hollow lead screw nut. The lead screw nut is mounted on the lead screw, and the lead screw nut and the lead screw are driven by ball joints to form a first-stage lead screw. The lead screw guide head is fixed to the front end of the lead screw, serving as a transition and transmission component between the lead screw and the hollow lead screw. The hollow lead screw nut is mounted on the hollow lead screw, and the hollow lead screw nut and the hollow lead screw are driven by ball joints. The hollow lead screw is sleeved on the lead screw via the lead screw guide head and is slidably connected to the lead screw via the lead screw guide head to form a second-stage lead screw.

[0007] Furthermore, the side of the lead screw guide head is regularly provided with several positioning protrusions, and the hollow lead screw is arranged through the front and rear to form a hollow hole. The inner wall of the hollow hole is regularly provided with several guide grooves along the positions of the positioning protrusions to facilitate their insertion. The several guide grooves are regularly arranged on the inner wall of the hollow lead screw along the axial direction of the hollow lead screw.

[0008] Furthermore, the plurality of positioning protrusions are strip-shaped protrusions and are arranged parallel to the outer surface of the side of the lead screw guide head along the axial direction; the strip-shaped protrusions have the same cross-sectional shape as the guide groove, thereby engaging in the guide groove and sliding back and forth in the guide groove.

[0009] Furthermore, a plurality of ball bearings and radial locking nuts are regularly installed on the tail end of the hollow lead screw. The radial locking nuts are fixed to the rear ends of the plurality of ball bearings, thereby locking the plurality of ball bearings to the tail end of the hollow lead screw. The plurality of ball bearings are regularly installed in bearing sleeves and sealed in the bearing sleeves by bearing baffles. The plurality of ball bearings, together with the bearing sleeves and the bearing baffles, are fitted onto the tail end of the hollow lead screw and locked and fixed to the tail end of the hollow lead screw by the radial locking nuts.

[0010] Furthermore, a connecting block is regularly arranged between the front part of the lead screw nut and the tail part of the hollow lead screw, and the connecting block is fixed to the front end of the lead screw nut by fasteners; the connecting block is regularly arranged between the lead screw nut and the bearing sleeve, and the lead screw nut pushes the bearing sleeve forward to slide through the connecting block.

[0011] Furthermore, the front end of the connecting block is regularly provided with a slot to facilitate the sliding of the bearing sleeve.

[0012] Furthermore, the lead screw guide head is regularly provided with a threaded boss at its front end, and the outer surface of the threaded boss is regularly provided with threads. The lead screw is regularly provided with a threaded hole that mates with the threaded boss at its front end, and the lead screw guide head is locked and fixed to the front end of the lead screw through the threaded boss.

[0013] Furthermore, the outer diameter of the lead screw guide head is larger than the outer diameter of the lead screw, and the side of the lead screw guide head is in close contact with the inner wall of the hollow lead screw.

[0014] Furthermore, the plurality of guide grooves and the plurality of positioning protrusions are regularly arranged in two sets.

[0015] Furthermore, the outer side surface of the hollow screw nut is recessed inward along its radial direction, and a number of wear-resistant ring mounting grooves are regularly provided, and a number of wear-resistant rings for contacting the inner wall of the cylinder are regularly installed.

[0016] The beneficial effects of this utility model are:

[0017] This utility model discloses a two-stage electric cylinder lead screw. A lead screw guide head is fixed to the front end of the first-stage lead screw. This guide head serves as a connector and transmission component between the first-stage and hollow lead screws, thus realizing the two-stage electric cylinder lead screw. Only five components are required to realize the two-stage electric cylinder lead screw, resulting in a simpler structure, easier production and assembly, and lower production and operating costs. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of the present invention;

[0019] Figure 2 This is a three-dimensional structural diagram of the present invention;

[0020] Figure 3 for Figure 2 Explosion state diagram;

[0021] Figure 4 This is a cross-sectional view of an embodiment of the present invention;

[0022] Figure 5 for Figure 4 Explosion state diagram;

[0023] Figure 6 for Figure 5 The combined state diagram;

[0024] The diagram is marked as follows:

[0025] 1. Lead screw, 2. Lead screw nut, 3. Lead screw guide head, 301. Positioning protrusion, 4. Hollow lead screw, 401. Hollow hole, 402. Guide groove, 403. Hollow lead screw tail end, 5. Hollow lead screw nut, 501. Wear ring mounting groove, 6. Connecting block, 601. Baffle slot, 7. Bearing sleeve, 8. Bearing baffle, 9. Ball bearing, 10. Radial lock nut, 11. Second ball bearing, 12. Second radial lock nut. Detailed Implementation

[0026] To make the above-mentioned contents, objectives, and beneficial effects of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0027] It should be noted that, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0028] like Figure 1-6 As shown, this utility model provides a two-stage electric cylinder lead screw, including a lead screw 1, a lead screw nut 2, a lead screw guide head 3, a hollow lead screw 4, and a hollow lead screw nut 5.

[0029] In this design, a lead screw nut 1 is mounted on a lead screw 1, and the two are driven by ball joints to form a primary lead screw. A lead screw guide head 3 is fixed at the front end of the lead screw 1, serving as a guide between the lead screw 1 and the hollow lead screw 4. A hollow lead screw nut 5 is mounted on the hollow lead screw 4, and the two are driven by ball joints. The hollow lead screw 4 is fitted onto the lead screw 1 and is slidably connected to it via the lead screw guide head 3, thus forming a secondary lead screw together with the primary lead screw.

[0030] Furthermore, such as Figure 1 As shown, the lead screw guide head 3 is fixed to the front end of the lead screw 1. The lead screw guide head 3 has a cylindrical body with a threaded boss at its front end, and the outer surface of the threaded boss is regularly threaded. Correspondingly, the front end of the lead screw 1 is regularly provided with a threaded hole that mates with the threaded boss. The lead screw guide head is locked in the threaded hole at the front end of the lead screw 1 by the threaded boss, thereby being installed and fixed at the very front end of the lead screw 1.

[0031] Furthermore, such as Figure 1 As shown, the side of the lead screw guide head 3 is regularly provided with several positioning protrusions 301. Correspondingly, the hollow lead screw 4 is arranged through the front and rear ends, forming a hollow hole 401, which passes through the front and rear ends of the hollow lead screw. Along the positions of the positioning protrusions 301, the inner wall of the hollow hole 401 is regularly provided with several guide grooves 402 that cooperate with them. The guide grooves are arranged in parallel and are set on the inner wall of the hollow lead screw 4 in the axial direction.

[0032] Furthermore, several positioning protrusions 301 are strip-shaped protrusions and are arranged parallel to the axial direction of the lead screw guide head 3, so that the lead screw 1 and the hollow lead screw 4 can be slidably connected by the several positioning protrusions 301 being engaged in the guide groove 402 on the inner wall of the hollow lead screw.

[0033] Furthermore, in one embodiment, two sets of guide grooves 402 and positioning protrusions 301 are regularly arranged.

[0034] Furthermore, the lead screw guide head 3 is cylindrical, and the hollow hole 401 is also a circular through hole. When the hollow lead screw 4 is inserted into the lead screw 1 along several positioning protrusions on the outer surface of the lead screw guide head 3, the outer side surface of the lead screw guide head 3 is tightly fitted with the inner wall of the hollow hole 401.

[0035] Furthermore, the outer diameter of the lead screw guide head 3 is larger than the outer diameter of the lead screw 1, which can prevent the outer surface of the threaded rod of the lead screw 1 from wearing against the inner wall of the hollow lead screw 1, thus avoiding wear on the outer surface of the lead screw 1.

[0036] Furthermore, such as Figure 2As shown, the outer side surface of the hollow screw nut 5 is recessed inward along its radial direction, and several wear-resistant ring mounting grooves are regularly provided, and several wear-resistant rings for contacting the inner wall of the cylinder are regularly installed.

[0037] Furthermore, the screw nut 2 is preferably a nut with a flange structure, but a nut without a flange structure can also be used.

[0038] Furthermore, such as Figure 4 and Figure 5 As shown, a number of ball bearings 9 and radial locking nuts 10 are regularly installed on the tail 403 of the hollow lead screw 4. The radial locking nuts 10 are used to lock the ball bearings 9 onto the tail 403 of the hollow lead screw.

[0039] Furthermore, a bearing sleeve 7 is provided around the periphery of several ball bearings 9. The left end of the bearing sleeve 7 has regularly arranged bearing grooves for arranging and installing the ball bearings 9. The ball bearings 9 are arranged and installed in the bearing grooves of the bearing sleeve 7, and are fitted onto the tail end 403 of the hollow lead screw 4 together with the bearing sleeve 7. Subsequently, the bearing sleeve 7 seals the ball bearings 9 within the bearing sleeve 7 through a bearing baffle 8. The bearing baffle 8 is locked and fixed to the left end of the bearing sleeve 7 by screws or other fasteners.

[0040] Furthermore, a connecting block 6 is regularly provided between the front part of the lead screw nut 2 and the tail part of the hollow lead screw 4, and the connecting block 6 is fixed to the front end of the lead screw nut 2 by fasteners.

[0041] Furthermore, such as Figure 5 As shown, the connecting block 6 is cylindrical, and its front end is regularly provided with a baffle slot 601 to facilitate the insertion of the bearing baffle 8.

[0042] Furthermore, the tail end of the lead screw 1 is also regularly provided with several second ball bearings 11 and second radial locking nuts 12, which lock and fix the several second ball bearings 11 to the tail end of the lead screw 1. The several second ball bearings 11 are generally arranged and installed in the end cover at the rear end of the cylinder body, thereby enhancing the stability of the lead screw 1 during rotation.

[0043] The working principle of this two-stage electric cylinder lead screw is as follows:

[0044] like Figure 4 and Figure 6As shown, the motor drives the lead screw 1 to rotate inside the cylinder. The lead screw nut 2 converts the rotational motion of the lead screw 1 into linear motion, and the lead screw nut 2 slides forward. The lead screw nut 2 pushes the bearing sleeve 7 forward through the connecting block 6, and the bearing sleeve 7 drives the hollow lead screw 4 to slide forward. At the same time, the lead screw 1 drives the hollow lead screw 4 to rotate together through the lead screw guide head 3 at its front end. The hollow lead screw nut 5 converts the rotational motion of the hollow lead screw 4 into linear motion, and the hollow lead screw nut 5 slides forward.

[0045] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A two-stage electric cylinder lead screw, characterized in that: The system includes a lead screw (1), a lead screw nut (2), a lead screw guide head (3), a hollow lead screw (4), and a hollow lead screw nut (5). The lead screw nut (2) is installed on the lead screw (1), and the lead screw nut (2) and the lead screw (1) are connected by ball joints to form a primary lead screw. The lead screw guide head (3) is installed and fixed at the front end of the lead screw (1) as a transition and transmission component between the lead screw (1) and the hollow lead screw (4). The hollow lead screw nut (5) is installed on the hollow lead screw (4), and the hollow lead screw nut (5) and the hollow lead screw (4) are connected by ball joints to form a secondary lead screw. The hollow lead screw (4) is sleeved on the lead screw (1) through the lead screw guide head (3) and is slidably connected to the lead screw (1) through the lead screw guide head (3).

2. The two-stage electric cylinder lead screw according to claim 1, characterized in that: The side of the lead screw guide head (3) is regularly provided with a number of positioning protrusions (301). The hollow lead screw (4) is provided through the front and rear to form a hollow hole (401). The inner wall of the hollow hole is regularly provided with a number of guide grooves (402) at the positions of the positioning protrusions (301) to facilitate their insertion. The number of guide grooves (402) are regularly provided on the inner wall of the hollow lead screw (4) along the axial direction.

3. The two-stage electric cylinder lead screw according to claim 2, characterized in that: The plurality of positioning protrusions (301) are strip-shaped protrusions and are arranged parallel to the outer surface of the side of the lead screw guide head (3) along the axial direction; the strip-shaped protrusions have the same cross-sectional shape as the guide groove, so that they are engaged in the guide groove and slide back and forth in the guide groove.

4. A two-stage electric cylinder lead screw according to any one of claims 1-3, characterized in that: A plurality of ball bearings (9) and radial locking nuts (10) are regularly installed on the tail of the hollow lead screw (4). The radial locking nuts (10) are fixed to the rear ends of the plurality of ball bearings (9), thereby locking the plurality of ball bearings to the tail of the hollow lead screw (4). The plurality of ball bearings (9) are regularly installed in the bearing sleeve (7) and sealed in the bearing sleeve (7) by the bearing baffle (8). The plurality of ball bearings (9) are fitted together with the bearing sleeve (7) and the bearing baffle (8) on the tail of the hollow lead screw (4) and locked and fixed to the tail of the hollow lead screw (4) by the radial locking nuts (10).

5. A two-stage electric cylinder lead screw according to claim 4, characterized in that: A connecting block (6) is regularly arranged between the front part of the lead screw nut (2) and the tail part of the hollow lead screw (4). The connecting block (6) is fixed to the front end of the lead screw nut (2) by fasteners. The connecting block (6) is regularly arranged between the lead screw nut (2) and the bearing sleeve (7). The lead screw nut (2) pushes the bearing sleeve (7) forward through the connecting block (6).

6. The two-stage electric cylinder lead screw according to claim 5, characterized in that: The front end of the connecting block (6) is regularly provided with a slot to facilitate the sliding of the bearing sleeve (7).

7. The two-stage electric cylinder lead screw according to claim 1, characterized in that: The lead screw guide head has a threaded boss at its front end, and the outer surface of the threaded boss has a thread. The lead screw (1) has a threaded hole at its front end that mates with the threaded boss. The lead screw guide head is locked and fixed at the front end of the lead screw (1) by the threaded boss.

8. A two-stage electric cylinder lead screw according to claim 2, characterized in that: The outer diameter of the lead screw guide head (3) is larger than the outer diameter of the lead screw (1), and the side of the lead screw guide head (3) is in close contact with the inner wall of the hollow lead screw (4).

9. A two-stage electric cylinder lead screw according to claim 8, characterized in that: The plurality of guide grooves (402) and the plurality of positioning protrusions are regularly arranged in two sets.

10. A two-stage electric cylinder lead screw according to claim 8, characterized in that: The hollow screw nut (5) has a radially recessed outer surface on its side surface, with a number of wear-resistant ring mounting grooves (501) regularly provided, and a number of wear-resistant rings for contacting the inner wall of the cylinder are regularly installed.

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