WO2015074533A1 - Protection apparatus for ball-screw nut pair - Google Patents

Abstract

A protection apparatus for a ball-screw nut pair comprises a fixed sealing piece (1) and a moving sealing piece (4). An opening is provided at a surface of the fixed sealing piece (1). An accommodation space capable of accommodating a ball-screw nut pair is provided in the opening. The moving sealing piece (4) and the opening of the fixed sealing piece (1) are connected in a sealed manner. A strip moving switch (401) is further provided at the moving sealing piece (4) along an axial direction of the ball screw (2). When a nut (3) sealed in the ball screw nut pair protection apparatus moves along an axial direction of the ball screw (2), the strip moving switch (401) may be turned on by means of a member such as a connecting piece (5), so as to drive an external means to move. The apparatus can effectively prevent a ball-screw nut pair from external pollution, has a simple structure, and is easy to implement.

Description

Screw nut vice protection device Technical field

The invention relates to the technical field of machinery, in particular to a screw nut secondary protection device.

Background technique

A lead screw nut consisting of a lead screw and a nut is a mechanical transmission with a wide range of applications, which converts rotary motion into linear motion with reliable operation and long service life. For split robots, the role of the screw nut pair is especially important. Generally, the split robot drives the front and rear extension bodies alternately by the screw nut pair to realize the walking of the entire robot on the working surface. However, there are some problems in the use of the screw nut pair, for example, during the alternate walking of the front and rear extension bodies of the robot (this process is accompanied by the separation and closing of the front and rear extension bodies), and the lead screw is exposed. On the outside, it is easily polluted by harmful substances such as dust in the air. After a long time of work, a large amount of dust accumulates in the screw thread nest, increasing the friction between the screw and the nut, reducing work efficiency, and even affecting the machine in severe cases. Normal use. In addition, during the working process, the screw nut pair usually drives the external member along the axial direction of the screw through the connecting member on the nut to realize the corresponding function, which makes it difficult to be completely fixed and sealed in a sealed state. In the space, the protection of the screw nut pair is inconvenient.

Summary of the invention

In view of the above-mentioned deficiencies of the prior art, it is an object of the present invention to provide a screw nut secondary protection device which can effectively prevent the screw nut pair from being contaminated by the outside, thereby overcoming the above-mentioned drawbacks of the prior art.

The object of the invention is achieved by the following technical solutions:

A screw nut auxiliary protection device includes a fixed seal and a dynamic seal, wherein the fixed seal has an opening on one side thereof, and an accommodation space for accommodating the screw nut pair in the opening, the dynamic seal and the The open sealing connection of the fixed seal is further provided with a strip-shaped dynamic switch in the axial direction of the lead screw, the strip-shaped dynamic switch is only partially opened corresponding to the position of the nut, and the open position follows The nut moves.

On the basis of the above technical solutions, the present invention can further add the following technical features in order to better or more specifically solve the technical problem to be solved by the present invention:

The strip dynamic switch is composed of two zipper heads and a zipper strip that cooperate with each other.

Further, the strip dynamic switch is composed of two parallel zipper strips and a zipper head structure. Active zipper composition.

Further, the strip-shaped dynamic switch is composed of two pieces of mutually adsorbable elements, which are preferably rubber magnetic and velcro.

In the technical solution of the present invention, preferably, the fixed sealing member is made of a rigid material, such as a hard plastic, preferably polyethylene or polypropylene.

The working principle of the invention is: the screw nut pair is enclosed in the screw nut auxiliary protection device composed of the above fixed sealing member and the dynamic sealing member, and the nut is provided with a connecting member for driving the movement of the external member, and the connecting member is directly connected with The strip-shaped dynamic switch on the dynamic seal contacts and, at the point where the two are in direct contact, the strip-shaped dynamic switch is open, which allows the connector to be connected to the exterior. In a normal state, the strip-shaped dynamic switch is in a closed state with the uncontacted portion of the connecting member; when the connecting member drives the external member along the axial direction of the lead screw with the nut - and is also a strip-shaped dynamic switch Extension direction - when sliding, the strip-shaped dynamic switch located at the front side portion of the sliding direction of the connecting member is partially opened, and the strip-shaped dynamic switch located at the rear side portion of the sliding direction of the connecting member is reclosed after the connecting member slides over, which makes The strip dynamic switch is generally closed except for the portion directly in contact with the connector.

The above structural features of the screw nut auxiliary protection device of the present invention, in particular, the technical feature that the strip dynamic switch on the dynamic seal can be opened and closed in time, so that it does not hinder the movement of the screw nut pair and enables the wire The bar nut pair is always sealed in a closed space during the work.

The invention has the following beneficial effects: (1) After the screw nut auxiliary protection device of the invention is used, the portion of the screw nut pair originally exposed to the outside of the machine is completely sealed in the sealed space, so the screw nut protection of the present invention is protected The device can effectively prevent the screw nut pair from being polluted by the outside. (2) The structure is simple and easy to implement.

The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

DRAWINGS

1 is a schematic side view showing the structure of a first embodiment of the present invention;

2 is a schematic plan view showing the planar structure of the dynamic seal in the first embodiment of the present invention;

Figure 3 is a plan view showing the planar structure of the dynamic sealing member in another working state in the first embodiment of the present invention.

4A is a schematic plan view showing the dynamic seal of the second embodiment of the present invention;

4B is a schematic side view showing the dynamic seal of the second embodiment of the present invention;

4C-4D are schematic diagrams showing the assembly relationship between the U-shaped movable zipper and the screw nut pair in the present invention;

Fig. 5 is a schematic plan view showing the dynamic seal of the third embodiment of the present invention.

detailed description

Embodiments of the screw nut vice protection device of the present invention will be described below with reference to the accompanying drawings.

Embodiment 1

As shown in FIG. 1 , a screw nut auxiliary protection device includes a fixed seal 1 and a dynamic seal 4 . The fixed seal 1 has an opening on one side thereof and an accommodation space in the opening. A screw nut pair formed by the nut 3 is placed in the accommodating space, and the dynamic seal 4 is sealingly connected to the opening of the fixed seal 1 to make the accommodating space a sealed space.

As shown in FIG. 2, the dynamic seal 4 is further provided with a strip-shaped dynamic switch 401 along the axial direction of the lead screw 2, and the strip-shaped dynamic switch 401 is composed of two zipper heads 401a and zipper strips 401b that cooperate with each other.

The nut 3 is provided with a connecting member 5 for driving the movement of the external member. The connecting member 5 is sandwiched between the zipper strips 401b, and both ends thereof are fixedly connected to one of the zipper heads 401a. In the normal state, the zipper strip 401b at both ends of the zipper head 401a is in a closed state, and when the nut 3 drives the connecting member 5 to move along the axial direction of the screw rod 2, and also the extending direction of the zipper strip 401b, the connecting member The moving direction of 5 is the forward direction, and the zipper head 401a on the front side of the connecting member 5 pushes the zipper strip 401b partially to provide a passage for the connecting member 5 to move forward. After the connecting member 5 passes, the zipper head 401a on the rear side of the connecting member 5 Pull the zipper bar that is opened when the connector is opened, so that the screw nut pair is always in a confined space.

Embodiment 2

As shown in FIG. 3, when the connecting member is large, if the technical solution of the first embodiment is adopted, the gap between the connecting member 5 and the slider 401a is large, and the ash is easily introduced, resulting in poor sealing effect. To this end, the present invention uses the technical solution of the second embodiment to solve this problem:

In this embodiment, based on the first embodiment, the U-shaped movable zipper 402 is formed as a strip-shaped dynamic switch by using two pairs of zipper strips and a zipper head structure arranged in parallel. As shown in FIG. 4A to FIG. 4D, a zipper strip is disposed on each side of the connecting member 5, and a zipper head is disposed at each of the joints of the zipper strip and the connecting member. When the nut 3 drives the connecting member 5 to move along the axial direction of the screw rod 2, the moving direction of the connecting member 5 is the forward direction, and the two zipper heads on the front side of the connecting member simultaneously push the zipper strips arranged therewith to connect. The piece provides a moving space, and after the connecting piece is slid, the two zipper heads on the rear side of the connecting piece are respectively pulled together with the zipper strip provided with the matching, so that the screw nut pair is always in a sealed space. The structure effectively solves the problem that the gap between the connecting member and the zipper head is large when the connecting member is large, and the sealing property of the protection device is improved.

Embodiment 3

In addition to the above embodiments, the strip-shaped dynamic switch of the present invention can also achieve the object of the invention for protecting the lead screw nut pair using a rubber magnetic structure.

As shown in FIG. 5, the connecting member 5 is disposed between two pieces of rubber magnetic 403. In a normal state, the two pieces of rubber magnetic 403 are in a suction state by the action of suction, and are located at the connecting piece when the connecting member 5 is swiped. The rubber magnet at the front end of the sliding direction is opened by the connecting member, and after the connecting member is slid, the rubber magnets on both sides of the rear end of the sliding direction of the connecting member 5 are re-engaged under the self-suction force, so that the screw nut pair is always in a closed space.

It should be noted that, in the embodiment, the strip dynamic switch is not limited to the rubber magnetic structure, and the object of the present invention can be achieved by using magnetically equivalent elements such as velcro and the like, and it is of course to fall into the present invention. protected range.

Further, in the present embodiment and the above embodiment, the fixed sealing member 1 is preferably made of a hard plastic such as polyethylene or polypropylene.

The three embodiments of the present invention and other embodiments deducted on the basis of the third embodiment are described above with reference to the accompanying drawings. It is to be noted that the above-described embodiments are merely preferred embodiments of the present invention, and the scope of the present invention is not limited by the above embodiments. In the process of implementing the present invention, those skilled in the art can select an appropriate technical solution according to the specific characteristics of the working object. For example, the specific dimensions of the movable zipper or the U-shaped movable zipper of the present invention and the materials used therein can be specifically determined according to different characteristics of the working object. In summary, any deduction made on the basis of the technical solution claimed by the present invention is within the scope of the present invention.

Claims (7)

A screw nut auxiliary protection device comprises a fixed seal and a dynamic seal, wherein the fixed seal (1) has an opening on one side thereof, and an accommodation space for accommodating the screw nut pair in the opening, the dynamic seal The piece (4) is sealingly connected to the opening of the fixed seal (1), and the dynamic seal (4) is further provided with a strip-shaped dynamic switch (401) along the axial direction of the lead screw (2), The strip dynamic switch is only partially open corresponding to the position of the nut, and the open position follows the nut movement. The lead screw nut side protection device according to claim 1, wherein the strip-shaped dynamic switch (401) is composed of two zipper heads (401a) and a zipper strip (401b) that cooperate with each other. A lead screw nut protection device according to claim 1, wherein said strip-shaped dynamic switch (401) is U-shaped by two parallel zipper strips (401b) and zipper heads (401a). The zipper (402) is constructed. A lead screw nut side protection device according to claim 1, wherein said strip-shaped dynamic switch (401) is formed by combining two pieces of mutually adsorbable elements. A screw nut secondary protection device according to claim 4, wherein said mutually adsorbable elements are rubber magnetic (403) or velcro. A screw nut secondary protection device according to any one of claims 1 to 5, characterized in that the fixed sealing member (1) is made of a hard plastic. The lead screw nut side protection device according to claim 6, wherein the hard plastic is polyethylene or polypropylene.

Images