CN106884947A - A kind of multistage trapezoidal screw prevents locking device - Google Patents

Abstract

The invention relates to an anti-locking device for a multi-stage trapezoidal screw. The anti-locking device comprises an outer ratchet cover (7), an outer ratchet spring (8), a movable outer ratchet (9), a fixed outer ratchet (10), Inner cover (13), inner ratchet spring (14) and inner ratchet (15); The ends of inner ratchet (15), movable outer ratchet (9), fixed outer ratchet (10) and screw nut (2) are all provided with Ratchet; the ends of the inner ratchet (15), the movable outer ratchet (9), the fixed outer ratchet (10) and the nut (2) are all provided with ratchets; the movable outer ratchet (9), the outer ratchet spring (8) and the outer ratchet cover (7) are set on one end of the lead screw (1) in turn, and the outer ratchet (10), the screw nut (2), the inner ratchet (15), the inner ratchet spring (14) and the inner cover (13) are sequentially Set on the other end of the lead screw (1), the device is anti-lock, compact in structure, sensitive in response and high in reliability, and can realize high-speed movement.

Description

A device for preventing locking of multi-stage trapezoidal screw

Technical field:

The invention belongs to the technical field of mechanical transmission, and in particular relates to a multi-stage trapezoidal lead screw anti-locking device, which can be widely used in electric vertical devices, electric lifting extensions, numerical control machine tools, control execution systems, positioning systems, plastic machinery, military industry , high-load linear motion systems, measuring equipment, high-speed rotary motion, etc., are used to convert rotary motion into linear motion.

Background technique

During the high-speed transmission of the multi-stage screw, when the screw at each level is in place, the locking force between the screw and the nut thread pair is too large due to inertia, which eventually leads to the locking of the screw and the nut, and the drive system cannot Make the lead screw continue to rotate, causing the system to fail to work normally.

Contents of the invention

The object of the present invention is to provide a multi-stage trapezoidal lead screw anti-locking device, which solves the technical problem that the lead screw and the screw nut are locked during the high-speed transmission of the multi-stage lead screw.

The technical scheme of the present invention is that a multi-stage trapezoidal lead screw anti-locking device includes an outer ratchet cover, an outer ratchet spring, a movable outer ratchet, a fixed outer ratchet, an inner cover, an inner ratchet spring and an inner ratchet; The ends of the outer ratchet, the fixed outer ratchet and the nut are all provided with ratchets;

The outer ratchet spring is put into the outer ratchet cover, the movable outer ratchet, the outer ratchet spring and the outer ratchet cover are sequentially set on one end of the lead screw, the movable outer ratchet and the lead screw are connected by splines, and the outer ratchet cover is fixedly connected with the lead screw. The inner ratchet spring is put into the inner cover, and the outer ratchet, screw nut, inner ratchet, inner ratchet spring and inner cover are set on the other end of the lead screw in turn, the inner cover is fixedly connected with the lead screw, and the inner ratchet and the lead screw pass through the flower The key is connected, and the inner ratchet and the movable outer ratchet are installed oppositely, and the fixed outer ratchet is fixedly connected with the screw nut, and the screw nut is screwed on the thread in the middle of the lead screw.

The beneficial effects of the present invention are: 1) solve the technical problem of the locking of the lead screw and the screw nut during the high-speed transmission of the multi-stage lead screw, the structure is compact and simple, the reliability is good, and it is easy to implement; 2) the structure of the present invention can be reliably Accurately and reliably transmit the torque of the previous level of screw to the next level of screw, so that the two levels of screw can make a corresponding synchronous rotation movement, with the characteristics of stable rotation, reliability, responsiveness, and no blockage, etc. Obtain a good synchronous effect of the lead screw; 3) the present invention adopts a ratchet structure anti-locking high-speed multi-stage trapezoidal lead screw, and the lead screws of adjacent two-stage lead screw female pairs are connected by a friction pair, and the friction pair is fixed Installed on the front-stage lead screw and configured on the rear-stage lead screw to realize multi-stage lead screw linkage.

Description of drawings

Fig. 1 is the structural representation of the anti-locking device of a kind of multistage lead screw of the present invention;

Fig. 2 adopts the structural representation of the multi-stage trapezoidal lead screw of the present invention; Among the figure 1, a first-level lead screw 2, a first-level screw nut 3, a second-level lead screw 4, a second-level screw nut 5, a third-level lead screw 6, three Grade silk mother

Fig. 3 is the structural representation of silk nut in the present invention;

Fig. 4 is the structural representation of fixed external ratchet in the present invention;

Fig. 5 is the three-dimensional structure schematic diagram of the present invention;

Fig. 6 is a schematic structural view of a built-in ratchet in the present invention;

Fig. 7 is the schematic structural view of externally moving ratchet in the present invention;

Fig. 8 is a structural schematic diagram of the lead screw in the present invention.

detailed description

The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings.

As shown in Figures 1 and 2, a locking device for a multi-stage lead screw of the present invention includes an outer ratchet cover 7, an outer ratchet spring 8, a movable outer ratchet 9, a fixed outer ratchet 10, an inner cover 13, and an inner ratchet Spring 14 and inner ratchet 15. The ends of the inner ratchet 15, the movable outer ratchet 9, the fixed outer ratchet 10 and the screw nut 2 are all provided with ratchets. The middle part of the lead screw 1 is provided with threads, and the two ends of the lead screw 1 are spline structures.

Outer ratchet spring 8 is packed in outer ratchet cover 7, and moving outer ratchet 9, outer ratchet spring 8 and outer ratchet cover 7 are sleeved on leading screw 1 one end successively, and are positioned at the threaded end of leading screw 1 upper end. The movable outer ratchet 9 is connected with the leading screw 1 by a spline, and the outer ratchet cover 7 is connected with the leading screw 1 by threads. The inner ratchet spring 14 is loaded into the inner cover 13, the inner cover 13, the inner ratchet spring 14 and the inner ratchet 15 are sequentially set on the other end of the lead screw 1, and are located at the threaded end of the other end of the lead screw 1, and the inner ratchet 15 is oppositely installed with moving outer ratchet 9. The inner cover 13 is fixedly connected with the lead screw 1, and the fixing method adopts screw connection, and the inner ratchet 15 is connected with the lead screw 1 through a spline. The fixed outer ratchet 10 is set in the middle of the lead screw 1, and the fixed outer ratchet 10 is fixedly connected with the screw nut 2, and can also be made into one body. The cover is made in one piece. The screw nut 2 is threaded in the middle of the leading screw 1. The gear 18 is sleeved on the leading screw 1, and the gear 18 is the driving wheel of the leading screw 1.

When in use, if it is a multi-stage lead screw transmission, an anti-locking device of the present invention can be installed on each stage of lead screw pair.

The working basic principle of the present invention is: as shown in Figure 1 and Figure 2, through motor transmission power to gear 18, gear 18 drives leading screw 1 to rotate, and leading screw 1 under the effect of screw nut 2 simultaneously, leading screw 1 moves, When the lead screw 1 moves to a certain distance, under the action of the inner ratchet 15 and the inner ratchet spring 14, the inner ratchet 15 is smoothly in place, and the ratchet on the end face of the inner ratchet 15 meshes with the ratchet on the end face of the screw nut 2, thereby the thread The rod 1 stops rotating relative to the screw nut 2, that is, the screw 1 drives the screw nut 2 to rotate together, and the outer ratchet 10 is further set to drive the next-stage screw to rotate. When the next-stage screw moves to a certain position, the next-stage internal ratchet is on the Under the action of the inner ratchet spring of the first stage, the inner ratchet of the next stage is smoothly in place and relatively locked; the sequential rotation realizes the sequential movement process of the multi-stage screw.

The motor reverses, the gear 18 drives the lead screw 1 to rotate in the reverse direction, and the lead screw 1 moves to a certain position in the reverse direction. The ratchet on the end face of the ratchet 9 meshes with the ratchet on the end face of the fixed outer ratchet 10, so that the lead screw 1 stops rotating relative to the screw nut 2; the fixed outer ratchet 10 drives the next-stage lead screw to rotate in the opposite direction, and the next-stage lead screw moves in the opposite direction When a certain distance is reached, under the action of the spring of the next-stage external ratchet, the next-stage movable external ratchet is smoothly in place and stops rotating, and rotates in turn to realize the reverse movement process of the lead screw.

Claims (1)

1. a kind of multistage trapezoidal screw prevents locking device, it is characterized in that：This prevent locking device include outer ratchet lid (7), Outer ratchet spring (8), dynamic outer ratchet (9), fixed outer ratchet (10), inner cap (13), handle ratchet wheel spring (14) and handle ratchet wheel (15)；Interior spine The end of wheel (15), dynamic outer ratchet (9), fixed outer ratchet (10) and screw (2) is provided with ratchet；

Outer ratchet spring (8) loads in outer ratchet lid (7), moves outer ratchet (9), outer ratchet spring (8) and outer ratchet lid (7) successively It is sleeved on leading screw (1) one end, moves outer ratchet (9) with leading screw (1) by spline connection, outer ratchet lid (7) line is solid with leading screw (1) Fixed connection, handle ratchet wheel spring (14) loads in inner cap (13), fixed outer ratchet (10), screw (2), handle ratchet wheel (15), handle ratchet wheel spring (14) it is sleeved on successively on the other end of leading screw (1) with inner cap (13), inner cap (13) is fixedly connected with leading screw (1), handle ratchet wheel (15) installed in opposite directions with dynamic outer ratchet (9) by spline connection, and handle ratchet wheel (15) with leading screw (1), fixed outer ratchet (10) and silk Female (2) are fixedly connected, and screw (2) is screwed on the screw thread in the middle part of leading screw (1).