CN204140575U - Fire-resistant telescopic tube for actuator - Google Patents

Abstract

The utility model discloses a fireproof telescopic tube for an actuator, which comprises a tube body, an adapter, a plastic nut and a fireproof nut, wherein the adapter is connected with one end of the tube body; the plastic nut is connected to one end of the adapter far away from the pipe body; the fire-resistant nut is accommodated in the interior of the adapter and is arranged between the pipe body and the plastic nut. Therefore, when the plastic nut fails, the fire-resistant nut and the continuous transmission of the lead screw can still be used for protecting the safety of users or articles.

Description

Flameproof telescoping tubes for actuators

technical field

The utility model relates to a telescopic tube, in particular to a fireproof telescopic tube applied to a linear actuator.

Background technique

Linear actuators have been widely used in products such as hospital beds, electric chairs, electric doors, lifting equipment or furniture due to their light weight and quick response. In addition, in order to reduce weight and material costs, linear actuators Under the consideration of many factors, the nuts used for transmission with the lead screw are all made of plastic materials.

However, although this kind of plastic nut has the advantages of light weight and low cost, it is very easy to be burned to cause failure in the process of breaking out of fire. Moreover, if the equipment or device on which the actuator is installed is performing a push or pull action, the failure caused by the burnt plastic nut will seriously endanger the safety of the user's fall, or the safety of the item. Problems such as damage caused by falling from a height need to be improved.

Contents of the invention

The purpose of this utility model is to provide a fireproof telescopic tube for an actuator, which can protect the safety of users or objects by means of the continuous transmission of the fireproof nut and the lead screw when the plastic nut fails.

In order to achieve the above object, the utility model provides a fireproof telescopic tube for an actuator, the actuator has a lead screw, wherein the fireproof telescopic tube includes:

a tube;

an adapter seat connected to one end of the tube body;

a plastic nut connected to the end of the adapter seat away from the pipe body, the plastic nut is screwed and driven with the lead screw; and

A refractory nut is accommodated in the adapter seat and interposed between the pipe body and the plastic nut.

The adapter seat is a component made of metal material.

The adapter seat is provided with a nut accommodation slot, and the refractory nut is arranged in the nut accommodation slot.

A blocking portion is formed on one side of the nut containing groove, and the blocking portion is for attaching and contacting the refractory nut.

It further includes a clasp, the transfer base is provided with a clasp groove, and the clasp is set in the clasp groove for the refractory nut to attach and contact.

It further includes an elastic component sleeved on the outer periphery of the lead screw and clamped between the refractory nut and the plastic nut.

One end of the plastic nut is provided with a spring receiving groove for inserting the elastic component.

One side of the adapter seat is provided with an internal thread, and one side of the plastic nut is formed with an external thread which is mutually screwed with the internal thread.

One end of the pipe body is provided with a stepped section, and one side of the adapter seat is provided with a socket section fixed on the stepped section.

A fork is formed at the end of the plastic nut, and a fork groove is provided on the end surface of the refractory nut facing the plastic nut to be inserted and fixed with the fork.

After adopting the above scheme, the utility model has the following effects:

1. It can provide two-way protection for the actuator in the process of pushing or pulling;

2. Utilize the setting of the elastic component to prevent the refractory nut and the lead screw from being in transmission contact under normal conditions, which not only reduces the friction loss of the refractory nut, but also prolongs the service life;

3. With the setting of the buckle, on the one hand, it can provide the refractory nut as abutting contact, and on the other hand, it can improve the convenience of assembly.

Description of drawings

Fig. 1 is the appearance diagram of the combination of the fireproof telescopic tube of the present invention applied to the actuator;

Figure 2 is a cross-sectional view of the application of the fireproof telescopic tube of the utility model to the actuator;

Fig. 3 is a three-dimensional exploded view of a fireproof telescopic tube and a lead screw of the present invention;

Fig. 4 is the cross-sectional view of the combination of the fireproof telescopic tube and the lead screw of the present invention;

Fig. 5 is a cross-sectional view of the use state when the telescopic tube continues to protrude outward after the plastic nut of the present invention fails;

Fig. 6 is a cross-sectional view of the use state when the telescopic tube continues to retract inward after the plastic nut of the present invention fails;

Fig. 7 is a combined sectional view of another embodiment of the fireproof telescopic tube of the present invention.

【Symbol Description】

1-Fireproof telescopic tube; 10-Tube body;

11-fixing hole; 12-step section;

20-Adapter seat; 21-Internal thread;

22-socket section; 23-nut slot;

24-buckle groove; 25-stop;

30, 30a-plastic nut; 31-external thread;

32-internal thread; 33-spring container;

34-anti-rotation part; 35a-fork part;

40, 40a-refractory nut; 41-internal thread;

42a-fork groove; 50-buckle;

60-elastic component; 8-actuator;

81-base; 82-electric motor;

83-outer tube; 84-lead screw;

85-gear set; 86-rear support.

Detailed ways

The detailed description and technical content of the present utility model are described below with drawings, but the attached drawings are only for reference and illustration, and are not intended to limit the present utility model.

Please refer to Fig. 1 and Fig. 2, the utility model provides a kind of fireproof telescoping tube for the actuator, wherein the actuator 8 mainly includes a base 81, a motor 82, an outer tube 83, a guide Screw 84, a gear set 85 and a rear support 86, the motor 82 is fixed on one side of the base 81, the outer tube 83 is fixed on the base 81 in a direction parallel to the axis of the motor 82, and the lead screw 84 accommodates Inside the outer tube 83, the transmission is achieved through the gear set 85 and the motor 82, wherein the motor 82 can produce positive and negative rotation, so that the lead screw 84 can rotate clockwise or counterclockwise, and the rear support 86 is fixed on the base The other side of the seat 81 is coaxial with the lead screw 84 .

Please refer to FIG. 2 , FIG. 3 and FIG. 4 , the fireproof telescopic tube 1 of the present invention mainly includes a tube body 10 , an adapter seat 20 , a plastic nut 30 and a fireproof nut 40 .

The pipe body 10 is pierced in the aforementioned outer pipe 83, which can be made of metal materials such as aluminum alloy or stainless steel. One end of the pipe body 10 is provided with a fixing hole 11 and the other end is provided with a stepped section 12. The form of the external thread is provided on the stepped section 12 for transformation (not shown in the figure).

The adapter seat 20 can also be made of metal materials such as aluminum alloy and stainless steel. The adapter seat 20 of this embodiment is a circular tube with an internal thread 21 on the right side and a sleeve joint section 22 on the left side. The middle section is provided with a nut slot 23 and a buckle slot 24, and a stopper 25 is formed on the side of the nut slot 23 adjacent to the internal thread 21, wherein the sleeve section 22 is used to be sleeved on the pipe body 10 of the stepped section 12 combined.

The sectional surface of the plastic nut 30 is roughly in a convex shape, and an external thread 31 is formed on the outer surface of the small diameter side, so as to be screwed and locked with the internal thread 21 of the adapter seat 20, and formed in the center of the plastic nut 30 There is an internal thread 32 that is screwed and driven with the aforementioned lead screw 84, and a spring receiving groove 33 is provided on the inner end surface of the plastic nut 30; , the anti-rotation portion 34 is used to be embedded inside the outer tube 83 so that the plastic nut 30 does not rotate during the process of being screwed and driven with the aforementioned lead screw 84 .

The refractory nut 40 can be made of metal, ceramics or other materials with good refractory performance, and it is accommodated in the inside of the adapter 20 and between the pipe body 10 and the plastic nut 30. The refractory nut 40 The center of the inner thread 41 is also formed with the aforementioned lead screw 84 for mutual screw transmission.

Further, the fire-resistant telescopic tube 1 of the present utility model further includes a buckle 50, which is arranged in the buckle groove 24, on the one hand to limit the range of movement of the fire-resistant nut 40, and on the other hand to provide The end surface of the cap 40 serves as a butting contact, and the snap ring 50 improves the convenience of assembly.

Further, the fireproof telescopic tube 1 of the present utility model further includes an elastic component 60. The elastic component 60 of this embodiment is a helical compression spring, which is sleeved on the outer periphery of the aforementioned lead screw 84 and elastically clamped on the fire-resistant Between the nut 40 and the plastic nut 30, in order to ensure that the plastic nut 30 and the refractory nut 40 can be kept at an appropriate spacing distance, the refractory nut 40 can not be in transmission contact with the lead screw 84 under normal conditions. Preferably, one end of the elastic component 60 is accommodated in the spring groove 33 of the plastic nut 30 , so as to form a good positioning effect on the elastic component 60 .

Please refer to shown in Fig. 5, by the combination of above-mentioned components, this actuator 8 can be installed on related equipment such as an electric hospital bed, chair, table, window, wherein the fixing hole 11 of tube body 10 and the rear support 86 will be pierced and fixed by fixing components such as bolts (as shown in Figure 1). Relative to the outer tube 83, the action of protruding outward is made, and the plastic nut 30 is burnt and invalidated due to a fire, and the pipe body 10 is pushed to the buckle 50 and the refractory nut 40 by force, and the refractory nut 40 is stressed. In this case, there will be no self-rotation, and when the lead screw 84 rotates in a clockwise direction, the refractory nut 40, the retaining ring 50, the adapter seat 20 and the pipe body 10 will continue to protrude toward the outside of the outer pipe 83 together, and the It prevents the users and objects being carried from falling quickly in an instant, and thus plays a protective role.

Please refer to FIG. 6 , when the actuator 8 is doing pulling action during use, that is, the lead screw 84 rotates counterclockwise, and the fireproof telescopic tube 1 will be retracted inwardly relative to the outer tube 83 action, the plastic nut 30 will burn out and fail due to a fire, and at this time, the right end of the refractory nut 40 is attached to the stopper 25 of the adapter seat 20, and the refractory nut 40 will not rotate when it is stressed When the lead screw 84 rotates in the counterclockwise direction, the refractory nut 40, the adapter seat 20 and the tube body 10 will be continuously retracted toward the inner side of the outer tube 83, so that the carried users and articles will not The situation of instant rapid drop occurs, and then plays a protective role. Therefore, regardless of whether the actuator 8 performs a push or pull action, the fireproof telescopic tube 1 of the present invention can obtain due protection.

Please refer to Fig. 7, the fire-resistant telescopic tube of the present invention can be in addition to the above, and can also be in the form of this embodiment, the difference from the previous embodiment is that the end of the plastic nut 30a is formed with a ring fork part 35a, the end face of the refractory nut 40a towards the plastic nut 30a is provided with a fork groove 42a that is inserted and fixed with the fork 35a, so as to ensure that the plastic nut 30a and the refractory nut 40a can be kept at an appropriate distance, Under normal conditions, the refractory nut 40a is not in driving contact with the lead screw 84, and thus has the equivalent effect of the foregoing embodiments.

To sum up, the utility model is used for the fireproof telescopic tube of the actuator, which can indeed achieve the expected purpose of use, but solves the lack of conventional knowledge, and because of its novelty and progress, it is completely in line with the utility model patent application Requirements, please file an application in accordance with the Patent Law, please check carefully and grant the patent of this case to protect the rights of the inventor.

Claims (10)

1. A fireproof type telescopic tube for actuator, described actuator has a lead screw, it is characterized in that: this fireproof type telescopic tube comprises: a tube; an adapter seat connected to one end of the tube body; a plastic nut connected to the end of the adapter seat away from the pipe body, the plastic nut is screwed and driven with the lead screw; and A refractory nut is accommodated in the adapter seat and interposed between the pipe body and the plastic nut. 2. The fireproof telescoping tube for the actuator according to claim 1, characterized in that: the adapter seat is a component made of metal material. 3. The fireproof telescopic tube for actuators as claimed in claim 2, wherein the adapter seat is provided with a nut slot, and the refractory nut is disposed in the nut slot. 4. The fire-resistant telescopic tube for actuators as claimed in claim 3, wherein a stopper is formed on one side of the nut cavity, and the stopper is for attaching and contacting the fireproof nut. . 5. The fireproof telescoping tube for actuator as claimed in claim 3, further comprising a buckle, the adapter seat is provided with a buckle groove, and the buckle is arranged on the buckle In the container, for the refractory nut to attach and contact. 6. The fireproof telescoping tube for an actuator as claimed in claim 1, further comprising an elastic component sleeved on the outer periphery of the lead screw and elastically clamped on the fireproof between the nut and the plastic nut. 7. The fireproof telescoping tube for an actuator as claimed in claim 6, characterized in that: one end of the plastic nut is provided with a spring slot for the elastic component to be inserted into. 8. The fireproof telescopic tube for actuators as claimed in claim 1, characterized in that: one side of the adapter seat is provided with an internal thread, and one side of the plastic nut is formed to interact with the internal thread An external thread for screwing. 9. The fireproof telescopic tube for actuators as claimed in claim 1, characterized in that: one end of the tube body is provided with a stepped section, and one side of the adapter seat is provided with a socket segment. 10. The fire-resistant telescopic tube for actuators as claimed in claim 1, wherein a fork is formed at the end of the plastic nut, and a fork is formed on the end face of the fire-resistant nut facing the plastic nut. The forks are inserted into and fixed with a fork groove.