Lead screw jack

Abstract

The utility model belongs to the technical field of jacks, and relates to a lead screw jack which comprises a base, an inner cylinder is connected to the base, an outer cylinder which is fixed in the circumferential direction and slides in the axial direction is sleeved outside the inner cylinder, the inner cylinder and the outer cylinder are in transmission connection through a lead screw assembly, and the lead screw assembly comprises a lead screw body, a lead screw seat and a lead screw nut. The lead screw body is rotationally connected with the lead screw seat and is in threaded connection with the lead screw nut, the lead screw seat is fixedly connected with the upper end of the outer cylinder, the lead screw nut is fixedly connected with the upper end of the inner cylinder, and the upper end of the lead screw body extends out of the lead screw seat and is matched with the rotary driving device; and a jacking driving piece synchronously moving with the outer cylinder is arranged on one side of the outer cylinder. The lead screw jack has the advantages of being simple in structure, convenient and labor-saving to operate, high in jacking speed and low in cost.

Description

Technical Field

[0001] The utility model belongs to the technical field of jacks and relates to a screw jack. Background Art

[0002] A jack is a small lifting device that uses a rigid lifting piece as a working device to lift heavy objects through a small stroke of the top support or bottom claws. Its structure is light and strong, flexible and reliable, and can be carried and operated by one person.

[0003] Jacks include mechanical jacks and hydraulic jacks. Hydraulic jacks are driven by hydraulic systems, and their structures are generally more complicated and their prices are higher. Mechanical jacks are lighter and cheaper, and are generally screw jacks. When the handle is pulled back and forth, the claws push the ratchet wheel to rotate, and the small bevel gear drives the large bevel gear to rotate the lifting screw, so that the lifting sleeve can be lifted or lowered, achieving the function of lifting pulling force. However, the lifting speed of mechanical jacks is slow and the operation is laborious. Utility Model Content

[0004] The utility model aims at the deficiencies of the prior art and provides a screw jack, which has the advantages of simple structure, convenient and labor-saving operation, fast lifting speed and low cost.

[0005] In order to solve the above technical problems, the purpose of the utility model is achieved through the following technical solutions:

[0006] A screw jack comprises a base, the base is connected to an inner cylinder, the inner cylinder is sheathed with an outer cylinder which is fixed circumferentially and slides axially, the inner cylinder and the outer cylinder are connected through a screw assembly, the screw assembly comprises a screw body, a screw seat and a screw nut, the screw body is rotatably connected to the screw seat and threadedly connected to the screw nut, the screw seat is fixedly connected to the upper end of the outer cylinder, the screw nut is fixedly connected to the upper end of the inner cylinder, the upper end of the screw body extends out of the screw seat and cooperates with a rotating drive device, and a lifting drive member which moves synchronously with the outer cylinder is provided on one side of the outer cylinder.

[0007] In the above-mentioned screw jack, the inner tube, outer tube and screw assembly are coaxially arranged, the outer tube and the inner tube are clearance-matched, an upper wear-resistant ring is embedded at the upper end of the outer wall of the inner tube, the upper wear-resistant ring is in contact with the inner wall of the outer tube, and a lower wear-resistant ring is embedded at the lower end of the inner wall of the outer tube, the lower wear-resistant ring is in contact with the outer wall of the inner tube. Further, the upper wear-resistant ring and the lower wear-resistant ring are embedded through an annular groove structure.

[0008] In the above-mentioned screw jack, the rotation drive device is an electric wrench, and the upper end of the screw body is provided with a hexagonal structure matched with the electric wrench. The rotation drive device can also be other devices, such as a small motor.

[0009] In the above-mentioned screw jack, the screw seat cover is arranged at the upper end of the outer cylinder, the outer cylinder is fastened to the screw seat by a plurality of fasteners, the upper end of the inner cylinder is provided with a screw nut installation groove, the screw nut is assembled in the screw nut installation groove, and the inner cylinder is fastened to the screw nut by a plurality of fasteners. Further, the fasteners are all bolts, the fasteners connecting the outer cylinder and the screw seat are arranged radially, and the fasteners connecting the inner cylinder and the screw nut are arranged axially.

[0010] In the above-mentioned screw jack, a screw convex ring is provided on the screw body, a ball bearing is provided between the screw body and the inner wall of the screw seat, and a thrust bearing is provided between the screw convex ring and the bottom of the screw seat. Further, a bearing seat is provided in the screw seat, the ball bearing is assembled in the bearing seat, and an axially limited retaining ring is provided on the screw body. Further, an annular groove matching with the thrust bearing is provided on the top of the screw convex ring and the bottom of the screw seat.

[0011] In the above-mentioned screw jack, a movable locking seat is sleeved on the outer cylinder, and the movable locking seat can slide along the axial direction and be locked by a cam handle, and the jacking drive member is fixedly connected to the movable locking seat.

[0012] In the above-mentioned screw jack, a jacking platform is arranged at the upper end of the jacking drive member, and a hook-shaped member is arranged at the lower end.

[0013] In the above-mentioned screw jack, a connection seat is fixed to the bottom of the inner cylinder, and the connection seat is rotatably connected to the base. Further, the connection seat is inserted into the bottom of the inner cylinder and is fastened by a plurality of radially arranged fasteners.

[0014] In the above-mentioned screw jack, a locking stud is provided at the bottom of the screw body, and a limiting step cooperating with the locking stud is provided at the bottom of the screw nut.

[0015] In the above-mentioned screw jack, an axial limiting groove is arranged on the outer wall of the inner cylinder, a flat key of a T-shaped structure radially penetrating is arranged at the bottom of the outer cylinder, the flat key is slidably arranged in the limiting groove, and the bottom cover of the outer cylinder is provided with an outer cylinder cover for fixing the flat key.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] 1. The utility model provides a screw jack, which uses a rotary drive device such as an electric wrench as power and a screw assembly as a transmission structure, and can easily lift heavy objects. It has the advantages of simple structure, convenient and labor-saving operation, fast lifting speed and low cost.

[0018] 2. The utility model improves the structure of the lifting driving member, lifts the bottom of the heavy object through the lifting platform, and hooks the rod body or the hole groove structure through the hook-shaped member, thereby expanding the use range of the screw jack.

[0019] 3. The utility model adopts a jacking drive member with a quick-release structure, which can be easily disassembled, stored or replaced. At the same time, the axial position of the jacking drive member can be adjusted to adapt to the position of the heavy object that needs to be jacked.

[0020] 4. The utility model improves the screw transmission structure, and a screw convex ring is arranged on the screw body to rotate with the bottom of the screw seat, providing an axial force on the screw seat to ensure that the screw seat and the outer cylinder move upward synchronously with the screw body.

[0021] 5. The utility model improves the base structure and adopts a joint structure with a rotatable angle, so as to realize the tilt support of the jack. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional diagram of the utility model;

[0023] Figure 2 It is an axial cross-sectional view of the utility model;

[0024] Figure numerals: 1. base; 2. inner tube; 3. outer tube; 4. screw body; 5. screw seat; 6. screw nut; 7. lifting drive member; 8. upper wear-resistant ring; 9. lower wear-resistant ring; 10. screw cam; 11. ball bearing; 12. thrust bearing; 13. movable locking seat; 14. cam handle; 15. lifting platform; 16. hook-shaped member; 17. connecting seat; 18. locking stud; 19. limiting groove; 20. flat key; 21. outer tube cover. DETAILED DESCRIPTION

[0025] The present invention will be further described below with reference to the accompanying drawings. Figure 1-2 :

[0026] A screw jack comprises a base 1, to which an inner cylinder 2 is connected, and an outer cylinder 3 which is fixed circumferentially and slides axially is sheathed on the inner cylinder 2, and the inner cylinder 2 and the outer cylinder 3 are connected through a screw assembly, and the screw assembly comprises a screw body 4, a screw seat 5 and a screw nut 6, the screw body 4 is rotatably connected to the screw seat 5 and is threadedly connected to the screw nut 6, the screw seat 5 is fixedly connected to the upper end of the outer cylinder 3, and the screw nut 6 is fixedly connected to the upper end of the inner cylinder 2, the upper end of the screw body 4 extends out of the screw seat 5 and cooperates with a rotating drive device, and a lifting drive member 7 which moves synchronously with the outer cylinder 3 is provided on one side of the outer cylinder 3.

[0027] During operation, the rotary drive device drives the screw body 4 to rotate, and its rotational motion is converted into linear motion through the transmission of the screw assembly. The screw body 4 and the screw seat 5 produce axial displacement relative to the screw nut 6, and the outer cylinder 3 accordingly produces axial displacement relative to the inner cylinder 2, and the jacking drive part 7 on the outer cylinder 3 moves synchronously to lift the heavy object.

[0028] The inner cylinder 2, outer cylinder 3 and screw assembly are coaxially arranged, the outer cylinder 3 and the inner cylinder 2 are clearance-matched, an upper wear-resistant ring 8 is embedded at the upper end of the outer wall of the inner cylinder 2, the upper wear-resistant ring 8 is in contact with the inner wall of the outer cylinder 3, and a lower wear-resistant ring 9 is embedded at the lower end of the inner wall of the outer cylinder 3, the lower wear-resistant ring 9 is in contact with the outer wall of the inner cylinder 2. Further, the upper wear-resistant ring 8 and the lower wear-resistant ring 9 are embedded through an annular groove structure. By arranging the upper wear-resistant ring 8 and the lower wear-resistant ring 9, the concentricity of the outer cylinder 3 and the inner cylinder 2 can be ensured.

[0029] The above-mentioned rotation driving device is an electric wrench, and a hexagonal structure matched with the electric wrench is arranged on the upper end of the screw rod body 4. By using the electric wrench, there is no need to configure a special power device, thereby saving costs.

[0030] The screw seat 5 is covered on the upper end of the outer cylinder 3, and the outer cylinder 3 is fastened to the screw seat 5 by a number of fasteners. The upper end of the inner cylinder 2 is provided with a screw nut 6 mounting groove, and the screw nut 6 is assembled in the screw nut 6 mounting groove. The inner cylinder 2 is fastened to the screw nut 6 by a number of fasteners. Further, the fasteners are bolts, and the fasteners connecting the outer cylinder 3 and the screw seat 5 are arranged radially, and the fasteners connecting the inner cylinder 2 and the screw nut 6 are arranged axially.

[0031] The screw body 4 is provided with a screw convex ring 10, a ball bearing 11 is provided between the screw body 4 and the inner wall of the screw seat 5, and a thrust bearing 12 is provided between the screw convex ring 10 and the bottom of the screw seat 5. Further, a bearing seat is provided in the screw seat 5, the ball bearing 11 is assembled in the bearing seat, and an axially limited retaining ring is provided on the screw body 4. Further, an annular groove matching with the thrust bearing 12 is provided at the top of the screw convex ring 10 and the bottom of the screw seat 5. By providing the screw convex ring 10, the screw seat 5 and the outer cylinder 3 can be better driven to move upward accordingly.

[0032] The outer cylinder 3 is sleeved with a movable locking seat 13, which can slide in the axial direction and be locked by a cam handle 14, and the lifting drive member 7 is fixedly connected to the movable locking seat 13. The height position of the lifting drive member 7 on the outer cylinder 3 can be adjusted by the adjustable movable locking seat 13.

[0033] The upper end of the lifting driving member 7 is provided with a lifting platform 15, and the lower end is provided with a hook-shaped member 16. Through the lifting platform 15 and the hook-shaped member 16, heavy objects of different specifications can be lifted.

[0034] A connection seat 17 is fixed to the bottom of the inner cylinder 2, and the connection seat 17 is rotatably connected to the base 1. Further, the connection seat 17 is inserted into the bottom of the inner cylinder 2 and is fastened by a plurality of radially arranged fasteners. Through the rotatable connection seat 17, the inner cylinder 2 can be rotated relative to the base 1 for tilting support.

[0035] The bottom of the screw body 4 is provided with a locking stud 18, and the bottom of the screw nut 6 is provided with a limiting step that cooperates with the locking stud 18. The axial movement stroke of the screw body 4 can be limited by the locking stud 18 and the limiting step.

[0036] The circumferential fixing structure of the outer cylinder 3 and the inner cylinder 2 in this embodiment is as follows: an axial limiting groove 19 is provided on the outer wall of the inner cylinder 2, a flat key 20 of a T-shaped structure is provided at the bottom of the outer cylinder 3 and is radially penetrated, the flat key 20 is slidably arranged in the limiting groove 19, and an outer cylinder cover 21 is provided at the bottom of the outer cylinder 3 to fix the flat key 20. The above structure can more conveniently assemble the inner cylinder 2 and the outer cylinder 3, and at the same time, the outer cylinder cover 21 is used as a part of the outer cylinder 3, and the lower wear-resistant ring 9 can also be arranged on the outer cylinder cover 21.

[0037] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A screw jack, characterized in that: The invention comprises a base (1), the base (1) is connected to an inner cylinder (2), the inner cylinder (2) is covered with an outer cylinder (3) which is fixed in the circumferential direction and slides in the axial direction, the inner cylinder (2) and the outer cylinder (3) are connected in transmission via a screw assembly, the screw assembly comprises a screw body (4), a screw seat (5) and a screw nut (6), the screw body (4) is rotatably connected to the screw seat (5) and is threadedly connected to the screw nut (6), the screw seat (5) is fixedly connected to the upper end of the outer cylinder (3), the screw nut (6) is fixedly connected to the upper end of the inner cylinder (2), the upper end of the screw body (4) extends out of the screw seat (5) and cooperates with a rotating drive device, and a lifting drive member (7) which moves synchronously with the outer cylinder (3) is provided on one side of the outer cylinder (3).

2. A screw jack according to claim 1, characterized in that: The inner cylinder (2), the outer cylinder (3) and the screw assembly are coaxially arranged, the outer cylinder (3) and the inner cylinder (2) are clearance-matched, an upper wear-resistant ring (8) is embedded in the upper end of the outer wall of the inner cylinder (2), and the upper wear-resistant ring (8) is in contact with the inner wall of the outer cylinder (3), and a lower wear-resistant ring (9) is embedded in the lower end of the inner wall of the outer cylinder (3), and the lower wear-resistant ring (9) is in contact with the outer wall of the inner cylinder (2).

3. A screw jack according to claim 1, characterized in that: The rotary drive device is an electric wrench, and the upper end of the screw rod body (4) is provided with a hexagonal structure that matches the electric wrench.

4. A screw jack according to claim 1, characterized in that: The screw seat (5) is covered on the upper end of the outer cylinder (3), and the outer cylinder (3) is fastened to the screw seat (5) by a plurality of fasteners. The upper end of the inner cylinder (2) is provided with a screw nut mounting groove, and the screw nut (6) is assembled in the screw nut mounting groove. The inner cylinder (2) is fastened to the screw nut (6) by a plurality of fasteners.

5. A screw jack according to claim 1, characterized in that: A screw convex ring (10) is arranged on the screw body (4), a ball bearing (11) is arranged between the screw body (4) and the inner wall of the screw seat (5), and a thrust bearing (12) is arranged between the screw convex ring (10) and the bottom of the screw seat (5).

6. A screw jack according to claim 1, characterized in that: The outer cylinder (3) is sleeved with a movable locking seat (13), which can slide in the axial direction and be locked by a cam handle (14), and the lifting drive member (7) is fixedly connected to the movable locking seat (13).

7. A screw jack according to claim 1, characterized in that: The upper end of the lifting driving member (7) is provided with a lifting platform (15), and the lower end is provided with a hook-shaped member (16).

8. The screw jack according to claim 1, characterized in that: A connecting seat (17) is fixed to the bottom of the inner cylinder (2), and the connecting seat (17) is rotatably connected to the base (1).

9. The screw jack according to claim 1, characterized in that: The bottom of the screw body (4) is provided with a locking stud (18), and the bottom of the screw nut (6) is provided with a limiting step that cooperates with the locking stud (18).

10. The screw jack according to claim 1, characterized in that: An axial limiting groove (19) is provided on the outer wall of the inner cylinder (2), a radially penetrating flat key (20) of a T-shaped structure is provided at the bottom of the outer cylinder (3), the flat key (20) is slidably arranged in the limiting groove (19), and an outer cylinder cover (21) for fixing the flat key (20) is provided at the bottom of the outer cylinder (3).

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