Lead screw electric cylinder

Abstract

The utility model relates to the technical field of linear modules, in particular to a lead screw electric cylinder. One side of the cylinder body is connected with a motor through a motor base, the motor is in driving connection with a lead screw, the lead screw extends into the cylinder body and is in threaded connection with a T-shaped nut in the cylinder body, one end of the T-shaped nut is sleeved with a sliding base, the outer end of the sliding base is sleeved with a sleeve, one end of the sleeve extends out of the cylinder body, and a fixing base is arranged at the end of the cylinder body; the fixed seat is provided with a through hole matched with the sleeve; and at least one group of friction rings are arranged on the surface of the sliding seat and are propped against the cylinder body. By replacing abrasion or reducing the friction coefficient, the replacement cost is reduced, and the abrasion is reduced.

Description

Technical Field

[0001] This utility model relates to the field of linear module technology, and in particular to a lead screw electric cylinder. Background Technology

[0002] Lead screw electric cylinders, as linear modules, are widely used in industrial production to convert rotational direction into linear direction. A lead screw electric cylinder includes a motor, cylinder body, nut, lead screw, and sleeve. The motor drives the lead screw to rotate, which in turn drives the nut located inside the cylinder to rotate. One end of the nut is connected to the sleeve. Both the nut and sleeve are located inside the cylinder, with one end of the sleeve extending out of the cylinder body. The movement of the nut causes the sleeve to move linearly, extending or retracting from the cylinder body. During this movement, the nut rubs against the cylinder body, causing wear and limiting its lifespan. To improve its lifespan, a slide block is generally used inside the cylinder body. The slide block is connected to both the nut and the sleeve, and it slides smoothly against the cylinder body. The material of the slide block is less hard than that of the cylinder body, thus protecting both the nut and the cylinder body. When the slide block shows significant wear, it can be replaced. Since the cost of the slide block is relatively high, using a cheaper alternative could further reduce replacement costs. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a lead screw electric cylinder with relatively low operating costs.

[0004] A lead screw electric cylinder includes: a cylinder body, a motor connected to one side of the cylinder body via a motor mount, a lead screw driven by the motor, the lead screw extending into the cylinder body and threadedly connected to a T-shaped nut inside the cylinder body, a slide block sleeved at one end of the T-shaped nut, a sleeve sleeved at the outer end of the slide block, one end of the sleeve extending out of the cylinder body, a fixed seat provided at the end of the cylinder body, the fixed seat having a through hole that mates with the sleeve; at least one set of friction rings are provided on the surface of the slide block, the friction rings abutting against the cylinder body.

[0005] Furthermore, the outer surface of the slide block is provided with an annular groove that matches the friction ring, and the friction ring is an open-ring structure.

[0006] Furthermore, the slide is a sleeve, one side of which is interference-fitted or threaded to the end of the T-nut, and the other side of which is interference-fitted or threaded to the sleeve.

[0007] Furthermore, the inner side of the cylinder is provided with a guide groove in the length direction, and the side of the slide is provided with a mounting hole, in which a guide post is sleeved, and the end of the guide post extends into the guide groove.

[0008] Furthermore, the cylinder block is equipped with an oil inlet and a plug.

[0009] Furthermore, a connecting seat is provided between the motor base and the cylinder body. The connecting seat has a fixing lug, the fixing lug has a fixing hole, and a bearing is provided inside the fixing seat. The lead screw is sleeved with the bearing.

[0010] A lead screw electric cylinder includes: a cylinder body, a motor connected to one side of the cylinder body via a motor mount, a lead screw driven by the motor, the lead screw extending into the cylinder body and threadedly connected to a T-shaped nut inside the cylinder body, a slide block sleeved at one end of the T-shaped nut, a sleeve sleeved at the outer end of the slide block, one end of the sleeve extending out of the cylinder body, a fixed seat provided at the end of the cylinder body, the fixed seat having a through hole that mates with the sleeve; and a plurality of sets of balls abutting against the inner side of the cylinder body on the surface of the slide block.

[0011] Furthermore, the surface of the slide is provided with several annular grooves, and the annular grooves are provided with multiple receiving holes. The receiving holes are provided with the ball bearings, and a part of the ball bearings extends out of the receiving holes. The annular grooves are fitted with a limiting ring, and the limiting ring is provided with a through hole that cooperates with the ball bearings. The diameter of the through hole is smaller than the diameter of the ball bearings.

[0012] Preferably, the limiting ring is an open-loop structure.

[0013] The limiting ring is designed as an open-loop structure.

[0014] Furthermore, an elastic element is provided inside the receiving hole, which pushes the ball outward.

[0015] The beneficial effects of this utility model are: by replacing worn parts or reducing the coefficient of friction, this utility model reduces replacement costs and wear. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of one structure in this embodiment.

[0017] Figure 2 This is an exploded view of this embodiment.

[0018] Figure 3 This is another exploded view of this embodiment.

[0019] The reference numerals in the figures include:

[0020] 1—Motor; 2—Motor mount; 3—Connecting seat; 4—Fixing lug; 5—Fixing hole; 6—Cylinder body; 7—Plug; 8—Fixing seat; 9—Lead screw; 10—T-nut; 11—Guide groove; 12—Oil inlet; 13—Guide post; 14—Mounting hole; 15—Friction ring; 16—Slide; 17—Bearing; 18—Sleeve; 19—Annular groove; 20—Accommodation hole; 21—Ball; 22—Limit ring. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the accompanying drawings. Figures 1 to 3 As shown.

[0022] Example: A lead screw electric cylinder includes: a cylinder body 6, a motor 1 connected to one side of the cylinder body 6 via a motor base 2, a lead screw 9 driven by the motor 1, the lead screw 9 extending into the cylinder body 6 and threadedly connected to a T-nut 10 inside the cylinder body 6, a slide 16 sleeved at one end of the T-nut 10, a sleeve 18 sleeved at the outer end of the slide 16, one end of the sleeve 18 extending out of the cylinder body 6, a fixing seat 8 provided at the end of the cylinder body 6, the fixing seat 8 having a through hole that mates with the sleeve 18; at least one set of friction rings 15 provided on the surface of the slide 16, the friction rings 15 abutting against the cylinder body 6.

[0023] Compared to existing technologies, this technical solution makes the outer diameter of the slide 16 slightly smaller. The friction ring 15 is located between the slide 16 and the cylinder 6. When the motor 1 drives the lead screw 9 to rotate, the lead screw 9 drives the nut to move linearly. The nut drives the slide 16 and the sleeve 18 to move, and the sleeve 18 performs linear extension and retraction. At the same time, the friction ring 15 and the cylinder 6 maintain sliding friction. Of course, to improve service life, lubricating oil is applied to the inner surface of the cylinder 6 to reduce the coefficient of friction between the friction ring 15 and the cylinder 6, reduce wear, and improve service life. Secondly, when the friction ring 15 is severely worn, the linear movement of the sleeve 18 will wobble. At this time, it is necessary to disassemble and replace the friction ring 15. There is no need to replace the slide 16, resulting in low replacement costs.

[0024] See Figure 2 The outer side of the slide block 16 is provided with an annular groove 19 that matches the friction ring 15, and the friction ring 15 has an open ring structure.

[0025] To facilitate the fitting of the friction ring 15 onto the slide block 16, an annular groove 19 is provided on the outer side of the slide block 16 in this embodiment. At the same time, the friction ring 15 is set as an open ring. When installing or removing it, the friction ring 15 can be deformed first so that the inner diameter of the friction ring 15 is slightly larger than the outer diameter of the slide block 16, and then it can be fitted or removed. After fitting, a mold is used for horizontal pressing to close the outer ring. Even if a slight gap is left, it will not affect the use.

[0026] See Figure 2 The slide block 16 is a sleeve, one side of which is interference-fitted or threaded to the end of the T-nut 10, and the other side of which is interference-fitted or threaded to the sleeve 18.

[0027] To facilitate the connection of the slide block 16 and the T-nut 10 without causing them to come apart, this embodiment uses an interference fit connection, with the slide block 16 fitted over the T-nut 10. Of course, a threaded connection can also be used. Meanwhile, the other side of the sleeve can be either interference fit or threaded to the sleeve. In this embodiment, a threaded connection is used.

[0028] See Figure 2 The inner side of the cylinder body 6 is provided with a guide groove 11 in the length direction, and the side of the slide 16 is provided with a mounting hole 14. A guide post 13 is sleeved in the mounting hole 14, and the end of the guide post 13 extends into the guide groove 11.

[0029] To prevent the lead screw 9 from causing the nut to rotate, this embodiment uses a guide post 13 on the slide 16, which is inserted into the guide groove 11. This not only prevents the slide 16 and the nut from rotating, but also ensures the linear direction of the slide 16's movement.

[0030] See Figure 2 The cylinder block 6 is equipped with an oil inlet 12 and a plug 7.

[0031] The oil inlet 12 is provided for easy internal refueling and to reduce wear.

[0032] See Figure 2 A connecting seat 3 is provided between the motor base 2 and the cylinder body 6. The connecting seat 3 is provided with a fixing ear 4. The fixing ear 4 is provided with a fixing hole 5. A bearing 17 is provided inside the fixing seat. The lead screw 9 is sleeved with the bearing 17.

[0033] Connector 3 is provided to facilitate the fixing of the lead screw electric cylinder, such as by bolts.

[0034] Example 2: See Figure 3 A lead screw electric cylinder includes: a cylinder body 6, a motor 1 connected to one side of the cylinder body 6 via a motor base 2, a lead screw 9 driven by the motor 1, the lead screw 9 extending into the cylinder body 6 and threadedly connected to a T-nut 10 inside the cylinder body 6, a slide 16 sleeved at one end of the T-nut 10, a sleeve 18 sleeved at the outer end of the slide 16, one end of the sleeve 18 extending out of the cylinder body 6, a fixed seat provided at the end of the cylinder body 6, the fixed seat having a through hole that mates with the sleeve 18; a plurality of sets of balls 21 are provided on the surface of the slide 16, the balls 21 abutting against the inner surface of the cylinder body 6.

[0035] In this embodiment, ball bearings 21 are used on the surface of the slide block 16. When the slide block 16 moves relative to the cylinder 6, the ball bearings 21 contact the cylinder 6 and roll, forming rolling friction between the ball bearings 21 and the cylinder 6. The coefficient of friction is greatly reduced, which effectively reduces the wear between the ball bearings 21 and the cylinder 6 and effectively extends the service life. Secondly, the ball bearings 21 are easy to replace and have low cost.

[0036] See Figure 3The surface of the slide block 16 is provided with a plurality of annular grooves 19, and the annular grooves 19 are provided with a plurality of receiving holes 20. The receiving holes 20 are provided with the ball bearing 21, and a part of the ball bearing 21 extends out of the receiving hole 20. The annular grooves 19 are fitted with a limiting ring 22, and the limiting ring 22 is provided with a through hole that cooperates with the ball bearing 21. The diameter of the through hole is smaller than the diameter of the ball bearing 21.

[0037] Preferably, the limiting ring 22 is an open-loop structure.

[0038] To facilitate the setting of the ball bearing 21, in this embodiment, an annular groove 19, a receiving hole 20, and a limiting ring 22 are provided in the slide block 16. With the cooperation of the limiting ring 22, the ball bearing 21 is limited in the receiving hole 20 and will not come out. At the same time, the annular groove 19 is used to hide the limiting ring 22 so that the limiting ring 22 will not protrude from the slide block 16.

[0039] Secondly, to facilitate the installation of the limit ring 22, the limit ring 22 can be designed as an open-loop structure.

[0040] Furthermore, an elastic element (not shown in the figure) is provided inside the receiving hole 20, which pushes the ball 21 outward.

[0041] The elastic element ensures that the ball bearing 21 remains in contact with the inner surface of the cylinder body 6. Even if the ball bearing 21 is worn, it will still extend and abut against the cylinder body 6. This also facilitates installation, as the ball bearing 21 can be partially retracted during installation.

[0042] The difference between Example 2 and Example 1 is that a ball bearing 21 is used instead of a friction ring 15. Several technical solutions in Example 1 can be used in Example 2.

[0043] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A lead screw electric cylinder, comprising: A cylinder body has a motor connected to one side via a motor mount. The motor drives a lead screw that extends into the cylinder body and is threadedly connected to a T-nut inside the cylinder body. A slide block is fitted onto one end of the T-nut, and a sleeve is fitted onto the outer end of the slide block. One end of the sleeve extends out of the cylinder body. A fixed seat is provided at the end of the cylinder body, and the fixed seat has a through hole that mates with the sleeve. The feature is that the surface of the slide block is provided with at least one set of friction rings, which abut against the cylinder body.

2. The lead screw electric cylinder according to claim 1, characterized in that: The outer surface of the slide block is provided with an annular groove that matches the friction ring, and the friction ring is an open-ring structure.

3. The lead screw electric cylinder according to claim 1, characterized in that: The slide is a sleeve, one side of which is interference-fitted or threaded to the end of the T-nut, and the other side of which is interference-fitted or threaded to the sleeve.

4. The lead screw electric cylinder according to claim 1, characterized in that: The inner side of the cylinder is provided with a guide groove in the length direction, and the side of the slide is provided with a mounting hole. A guide post is sleeved in the mounting hole, and the end of the guide post extends into the guide groove.

5. The lead screw electric cylinder according to claim 1, characterized in that: The cylinder block is equipped with an oil inlet and a plug.

6. The lead screw electric cylinder according to claim 1, characterized in that: A connecting seat is provided between the motor base and the cylinder body. The connecting seat has a fixing lug and a fixing hole. A bearing is provided inside the fixing seat, and the lead screw is sleeved with the bearing.

7. A lead screw electric cylinder, comprising: A cylinder body has a motor connected to one side via a motor mount. The motor drives a lead screw that extends into the cylinder body and is threadedly connected to a T-shaped nut inside the cylinder body. A slide block is fitted onto one end of the T-shaped nut, and a sleeve is fitted onto the outer end of the slide block. One end of the sleeve extends out of the cylinder body. A fixed seat is provided at the end of the cylinder body, and the fixed seat has a through hole that mates with the sleeve. The characteristic feature is that the surface of the slide block is provided with several sets of balls, and the balls abut against the inner surface of the cylinder body.

8. The lead screw electric cylinder according to claim 7, characterized in that: The surface of the slide is provided with several annular grooves, and the annular grooves are provided with multiple receiving holes. The receiving holes are provided with the ball bearings, and a part of the ball bearings extends out of the receiving holes. The annular grooves are fitted with a limiting ring, and the limiting ring is provided with a through hole that cooperates with the ball bearings. The diameter of the through hole is smaller than the diameter of the ball bearings.

9. The lead screw electric cylinder according to claim 8, characterized in that: The limiting ring has an open-loop structure.

10. The lead screw electric cylinder according to claim 8, characterized in that: An elastic element is provided inside the receiving hole, which pushes the ball outward.

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