Ball screw tripping structure

Abstract

The utility model relates to a ball screw tripping structure which comprises a lead screw, a retainer and a ring sleeve, and a plurality of ball mounting holes are formed in the retainer and used for mounting balls. The retainer is arranged between the lead screw and the ring sleeve in a sleeved mode so that the balls can roll in the spiral channel of the lead screw and the annular channel in the ring sleeve at the same time, and a driving block is arranged on the ring sleeve. At least one limiting pin is arranged at each of the two ends of the spiral channel of the lead screw, and notches are formed in the two ends of the retainer and used for being matched with the limiting pins after the retainer moves to the set position. When the operating mechanism is switched from opening to closing or from closing to opening, the lead screw rotates along the axis anticlockwise or clockwise, the ring sleeve does linear reciprocating motion through transmission of the retainer and the balls, and when the ring sleeve moves to corresponding positions at the two ends of the lead screw, the retainer can be limited by the limiting pin, namely tripping is achieved. When the lead screw rotates reversely, the limiting on the retainer is relieved, and buckling is realized; the structure can accurately control the two ends of the stroke of the driving block, and the transmission reliability is high.

Description

Technical Field

[0001] This utility model relates to the field of switch operating mechanism technology, specifically to a ball screw release structure. Background Technology

[0002] Gas-insulated switchgear (GIS) is a metal-enclosed high-voltage power distribution device using sulfur hexafluoride gas as the insulating medium, integrating various electrical components such as circuit breakers, busbars, and instrument transformers. Disconnect switches and grounding switches, as important components in GIS, serve functions such as circuit isolation and grounding protection, respectively. These switches require precise positioning of the contact insertion depth, i.e., the switch's movement position. Therefore, the electric mechanism operating these switches needs good starting and braking performance to eliminate the motion inertia of the transmission system and achieve precise positioning of the switch movement. For example, the invention patent application CN108023438A discloses an electric operating mechanism using a novel motor, mainly including a lead screw, nut, limit spring plate, and crank arm. The nut on the lead screw slides horizontally, driving the transmission crank arm to rotate to achieve the closing operation of the switch. When the nut slides out of the threaded section of the lead screw, it abuts against the limit spring plate to limit the switch position. Conversely, when opening, the motor rotates in the reverse direction, driving the lead screw nut to slide in the reverse direction, and the crank arm to rotate in the reverse direction to achieve the opening operation of the switch. Another patent, CN106328423B, discloses a three-position disconnect switch operating mechanism. It features a first spring and a second spring at each end of the lead screw to limit the lateral movement of the nut. All of these patents use spring-like limiting components to restrict the movement of the lead screw and nut. After the nut moves to the corresponding smooth section on the lead screw, the corresponding spring engages it. However, after a period of use, the spring force changes, causing the nut to move to an inaccurate position, resulting in inaccurate engagement and disengagement. Utility Model Content

[0003] The purpose of this invention is to provide a ball screw release structure to achieve precise release and engagement actions.

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

[0005] A ball screw release structure includes a screw, a cage, and an annular sleeve. The cage has multiple ball mounting holes for mounting balls. The cage is sleeved between the screw and the annular sleeve so that the balls can roll simultaneously in the helical groove of the screw and the annular groove of the annular sleeve. The annular sleeve has a drive block. The screw has at least one limit pin at each end of its helical groove, and both ends of the cage have notches for engaging with the limit pins after moving to a set position.

[0006] Furthermore, the retainer is cylindrical and has several rows of ball bearing mounting holes.

[0007] Furthermore, the cage is provided with four rows of ball bearing mounting holes, which are evenly spaced along the outer periphery of the cage.

[0008] Furthermore, the ring sleeve is provided with several annular grooves evenly spaced inside.

[0009] Furthermore, the drive block is fixedly connected to the ring sleeve and moves in a reciprocating linear motion with the ring sleeve.

[0010] Furthermore, the drive block is provided with mounting holes for connecting drive components and for driving the crank arm to move.

[0011] Furthermore, the limiting pin is a flexible pin.

[0012] Furthermore, the notch is ∠-shaped.

[0013] Furthermore, the notch includes a straight section and a slope section, with the slopes of the slope sections at both ends of the cage being opposite.

[0014] Furthermore, each end of the cage has at least two notches evenly distributed along the outer periphery of the cage, and each end of the lead screw is provided with two limiting pins distributed at 180-degree intervals.

[0015] The beneficial effects of this utility model are:

[0016] When the operating mechanism moves from disengaged to engaged or from engaged to disengaged, the lead screw rotates counterclockwise or clockwise along its axis. A cage is mounted between the lead screw and the ring sleeve, and balls are installed in the cage's mounting holes. The ring sleeve has an annular groove, allowing the balls to roll within it, thus driving the ring sleeve and drive block in reciprocating linear motion. Taking counterclockwise rotation of the lead screw as an example, when the drive block reaches a certain position, the notch at one end of the cage moves to the position of the limit pin. At this point, the lead screw continues to rotate counterclockwise, while the cage rotates clockwise under the influence of the balls. Due to the limit pin's restriction on the cage, the balls can only idle within the annular groove of the ring sleeve, thus disengaging the mechanism. When the lead screw rotates clockwise, the cage rotates counterclockwise under the influence of the balls. The limit pin moves along one side of the cage's notch, releasing the cage's restriction, thus engaging the mechanism. In the engaged and disengaged states, the cage is positioned precisely, without relying on springs or other mechanisms, thus avoiding the influence of the inertia of moving parts. The precise position of the cage ensures that the drive block's travel is also precise, thereby enabling more accurate opening and closing actions. Attached Figure Description

[0017] Figure 1 This is a perspective view of the ball screw release structure of this utility model;

[0018] Figure 2It is a cross-sectional view of the ring;

[0019] Figure 3 This is a diagram showing the state when the elastic pin at one end limits the cage.

[0020] Figure 4 yes Figure 3 End view of the structure shown;

[0021] Figure 5 This is a diagram showing a state during the process of the elastic pin at one end releasing its restraint on the cage.

[0022] 1. Lead screw; 11. Helical section; 2. Cage; 21. Ball bearing mounting hole; 22. Notch; 221. Straight section; 222. Bevel section; 3. Ring sleeve; 31. Annular groove; 4. Drive block; 41. Mounting hole; 5. Elastic pin. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art are within the protection scope of the present utility model.

[0024] Embodiments of this utility model:

[0025] like Figure 1 As shown, a ball screw release structure includes a screw 1, a retainer 2, and an annular sleeve 3. The retainer 2 has multiple ball mounting holes 21 for mounting balls. The retainer 2 is sleeved between the screw 1 and the annular sleeve 3, allowing the balls to roll simultaneously in the helical groove of the screw 1 and the annular groove 31 within the annular sleeve 3. When the screw 1 rotates, it can drive the annular sleeve 3 to move linearly.

[0026] The cage 2 is cylindrical and has several rows of ball bearing mounting holes 21. The cage 2 has four rows of ball bearing mounting holes 21, evenly spaced along its outer circumference; each row has eight ball bearing mounting holes 21, meaning the balls are arranged in a 4*8 pattern. The ball bearing mounting holes 21 are through holes, allowing the balls to roll simultaneously in the helical groove of the lead screw 1 and the annular groove 31 within the ring sleeve 3.

[0027] like Figure 2 As shown, the ring 3 is cylindrical. In this embodiment, the ring 3 has 8 annular grooves 31 evenly spaced inside, which correspond to the distribution of the balls; in other embodiments, it can also be set to 6 grooves, 10 grooves, etc.

[0028] The ring sleeve 3 is provided with a drive block 4, which is fixedly connected to the ring sleeve 3, for example, by welding. The drive block 4 moves linearly back and forth with the ring sleeve 3. The drive block 4 is provided with a mounting hole 41 for connecting a drive component (not shown, such as a roller) to drive the crank arm to move and realize the opening and closing of the circuit breaker.

[0029] The lead screw 1 is mostly a helical section 11, with at least one limiting pin at each end of its helical groove. The retainer 2 has notches 22 at both ends for engaging with the limiting pins after moving to a set position. The limiting pins are elastic pins 5, perpendicular to the axial direction of the lead screw 1. The elastic pins 5 are cylindrical pins, such as common straight-groove elastic pins or rolled elastic pins, which provide both limiting and impact resistance. In this embodiment, two elastic pins 5 are provided at each end of the lead screw 1, spaced 180 degrees apart; in other embodiments, one elastic pin 5 may be provided at each end.

[0030] The non-helical section of lead screw 1 has a square transmission part at one end, used for cooperating with the motor drive; the other end is a cylindrical part, rotatably mounted on the housing of the operating mechanism. Lead screw 1 can rotate in either the forward or reverse direction, but cannot move axially. Lead screw 1 is four-pronged and right-handed. When the operating mechanism moves from open to closed or from closed to open, lead screw 1 rotates counterclockwise or clockwise along its axis.

[0031] The notch 22 of the cage 2 is ∠-shaped and includes a straight section 221 and a slope section 222. The junction of the two sections is rounded to match the circumferential surface of the elastic pin. The slopes of the slope sections 222 of the notches 22 at both ends of the cage 2 are opposite.

[0032] Each end of the retainer 2 has at least two notches 22 evenly distributed along the outer periphery of the retainer 2, such as four or two notches per end.

[0033] The working principle of this utility model's ball screw release structure is as follows:

[0034] like Figures 3-4 As shown, when the lead screw 1 rotates counterclockwise, and the drive block 4 moves to a certain position at one end of the lead screw 1, the inclined notch 22 at one end of the retainer 2 moves to the installation position of the elastic pin 5 (the elastic pin 5 is located at the bottom of the groove of the notch 22). At this time, the lead screw 1 rotates counterclockwise, while the retainer 2 rotates clockwise under the drive of the balls. Due to the limiting effect of the elastic pin 5 on the retainer 2, the balls can only rotate freely within the annular groove 31 of the ring sleeve 3, thereby achieving disengagement of the mechanism. Conversely, if the lead screw 1 rotates clockwise, the retainer 2 rotates counterclockwise under the drive of the balls. The elastic pin 5 at one end of the lead screw 1 moves along the slope of the inclined notch 22 of the retainer 2, releasing the retainer 2 from the limiting state, thereby achieving engagement of the mechanism. Figure 5As shown. The slope of the notch 22 at the right end of the cage 2 is opposite to that of the notch 22 at the left end. When the drive block 4 moves to a certain position at the other end of the lead screw 1, the principle of disengagement and engagement is the same, which will not be described again.

Claims

1. A ball screw release structure, characterized in that: It includes a lead screw, a cage, and a ring sleeve. The cage has multiple ball mounting holes for installing balls. The cage is sleeved between the lead screw and the ring sleeve so that the balls can roll simultaneously in the helical groove of the lead screw and the annular groove of the ring sleeve. The ring sleeve has a drive block. The lead screw has at least one limit pin at each end of its helical groove. Both ends of the cage have notches for engaging with the limit pins after moving to a set position.

2. The ball screw release structure according to claim 1, characterized in that: The cage is cylindrical and has several rows of ball bearing mounting holes.

3. The ball screw release structure according to claim 2, characterized in that: The cage has four rows of ball bearing mounting holes, which are evenly spaced along the outer periphery of the cage.

4. The ball screw release structure according to claim 1, characterized in that: The ring sleeve has several annular channels that are evenly spaced inside.

5. The ball screw release structure according to claim 1, characterized in that: The drive block is fixedly connected to the ring and moves in a reciprocating linear motion with the ring.

6. The ball screw release structure according to claim 5, characterized in that: The drive block is provided with mounting holes for connecting drive components and for driving the crank arm to move.

7. The ball screw release structure according to claim 1, characterized in that: The limiting pin is a flexible pin.

8. The ball screw release structure according to claim 1, characterized in that: The opening is ∠-shaped.

9. The ball screw release structure according to claim 8, characterized in that: The opening includes a straight section and a slope section, with the slopes of the slope sections at both ends of the cage being opposite.

10. The ball screw release structure according to claim 9, characterized in that: Each end of the cage has at least two notches evenly distributed along the outer periphery of the cage, and each end of the lead screw has two limiting pins distributed at 180-degree intervals.

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