CN211343831U

CN211343831U - Self-locking compressed air spring

Info

Publication number: CN211343831U
Application number: CN201922258657.9U
Authority: CN
Inventors: 陶声荣; 李晓刚
Original assignee: Changzhou Lant Gas Spring Co ltd
Current assignee: Changzhou Lant Gas Spring Co ltd
Priority date: 2019-12-17
Filing date: 2019-12-17
Publication date: 2020-08-25
Anticipated expiration: 2029-12-17

Abstract

The utility model discloses a from locking-type compressed air spring, include: one end of the cylinder barrel is closed or sealed, the other end of the cylinder barrel is provided with a first sealing assembly, and the inner wall of the cylinder barrel is provided with internal threads; the piston is positioned in the cylinder barrel, the outer wall of the piston is provided with an external thread, and the cylinder barrel and the piston are matched with the external thread through the internal thread; one end of the piston rod is connected with the piston, and the other end of the piston rod passes through the first sealing assembly and is exposed outside the cylinder barrel; the cylinder barrel or the piston rod is rotatably arranged on the supporting component; the gas is arranged in the cylinder barrel, and in a non-locking state, the gas acting on the piston and the cylinder barrel or a piston rod connected with the piston move under the matching action of the internal thread and the external thread of the cylinder barrel and the piston; and a locking mechanism which is matched with the cylinder barrel or the piston rod and locks the moving cylinder barrel or the moving piston rod. The utility model discloses a from locking-type compressed air spring has the advantage of stable state.

Description

Self-locking compressed air spring

Technical Field

The utility model relates to a from locking-type compressed air spring.

Background

The high-pressure self-locking compressed gas spring is suitable for occasions such as lifting and pitching of a seat, opening and closing of a door, lifting of mechanical devices and the like. Because these devices are in direct contact with people, the gas spring is generally required to have higher safety and reliability so as to ensure that no accident occurs during action; the stress solving structure is simple, so that the installation, the use and the maintenance are convenient; the auxiliary power required during working is small, the lifting force is constant, and a buffer mechanism is arranged to avoid damage; when lifting, it should be ensured that the device can stay at any position at any time.

The existing self-locking compressed gas spring has an unreasonable structure, and when the self-locking compressed gas spring is lifted to a required position, theoretically, the pressures on two sides of a piston in the self-locking compressed gas spring are balanced, but if a user applies pressure or lifting acting force to the upper part or the lower part (such as a table top or table legs) of a mechanism to be lifted without attention, the pressure inside the gas spring is changed, so that the upper part or the lower part (such as the table top or the table legs) of the mechanism to be lifted is in a floating state. Therefore, the prior self-locking compression gas spring cannot ensure the stability of the state of the gas spring in the use process.

SUMMERY OF THE UTILITY MODEL

The utility model provides a stable state from locking-type compressed air spring.

The scheme for achieving the purpose is as follows:

self-locking compressed gas spring, comprising:

one end of the cylinder barrel is closed or sealed, the other end of the cylinder barrel is provided with a first sealing assembly, and the inner wall of the cylinder barrel is provided with internal threads;

the piston is positioned in the cylinder barrel, the outer wall of the piston is provided with an external thread, and the cylinder barrel and the piston are matched with the external thread through the internal thread;

one end of the piston rod is connected with the piston, and the other end of the piston rod passes through the first sealing assembly and is exposed outside the cylinder barrel;

the cylinder barrel or the piston rod is rotatably arranged on the supporting component;

the gas is arranged in the cylinder barrel, and in a non-locking state, the gas acting on the piston and the cylinder barrel or a piston rod connected with the piston move under the matching action of the internal thread and the external thread of the cylinder barrel and the piston;

and a locking mechanism which is matched with the cylinder barrel or the piston rod and locks the moving cylinder barrel or the moving piston rod.

The utility model has the advantages that: the self-locking type compressed gas spring is enabled to move through gas pressure acting on the piston and the cylinder barrel or a piston rod connected with the piston under the matching action of the internal thread and the external thread of the cylinder barrel and the piston, so that the self-locking type compressed gas spring is enabled to rise or fall (external pressure is applied to a supporting mechanism (such as a table top) which needs to rise and fall when the self-locking type compressed gas spring is lowered), when locking is needed, the self-locking type compressed gas spring is matched with the moving cylinder barrel or the moving piston rod through the locking mechanism, the cylinder barrel or the piston rod is enabled to stop moving through the locking action generated by the locking mechanism, locking is formed on the. And the self-locking compression gas spring is kept in a locking state through the matching action of the locking mechanism and the cylinder barrel or the piston rod, so that even if lifting or pressing acting force is applied to the upper part or the lower part (such as a table top or table legs) of the mechanism needing to be lifted, the locking of the self-locking compression gas spring cannot be released, and the self-locking compression gas spring is always in a stable state after stopping working.

Drawings

Fig. 1 is a schematic view of the first self-locking type compressed gas spring of the present invention;

fig. 2 is a sectional view of a first self-locking compressed gas spring of the present invention;

FIG. 3 is a schematic view of a housing in a first self-locking compressed gas spring;

FIG. 4 is a schematic view of a positioning member in a first self-locking compression gas spring;

fig. 5 is a sectional view of a second self-locking compressed gas spring of the present invention;

fig. 6 is a sectional view of a third self-locking compressed gas spring according to the present invention;

fig. 7 is a schematic view of a second locking mechanism of the present invention;

fig. 8 is a schematic view of a third locking mechanism of the present invention.

Detailed Description

Example 1

As shown in fig. 1 and 2, the self-locking type compression gas spring comprises a cylinder 1, a piston 2, a piston rod 3, gas, a support assembly 5 and a locking mechanism 6, and each part and the relationship between the parts are explained in detail as follows:

as shown in fig. 1 and 2, one end of the cylinder 1 is sealed, the other end of the cylinder 1 is provided with a first sealing component, and the inner wall of the cylinder 1 is provided with an internal thread 11. One end of the cylinder barrel 1 is provided with an opening, the sealing at one end of the cylinder barrel 1 is realized by adopting a plug 12, one end of the plug 12 is fixedly connected with one end of the cylinder barrel 1, and the other end of the plug 12 is used for connecting the upper part or the lower part (such as a table top or a table foot) of a mechanism needing to be lifted. The first sealing assembly comprises a sealing part 13 (a sealing ring), a spacer bush 14 and a top bush 15, wherein the sealing part 13 is positioned between the spacer bush 14 and the top bush 15, and the spacer bush 14 and the top bush 15 are respectively fixed in the cylinder barrel 1.

As shown in fig. 1 and 2, preferably, an annular groove is provided on the outer peripheral surface of the spacer 14, and after the spacer 14 is installed in the cylinder 1, the spacer is press-fitted inward from the outer wall of the cylinder 1, so that the inner wall of the cylinder 1 forms a protrusion which is fitted into the annular groove on the spacer 14, thereby fixing the spacer 14 and the cylinder 1 as a whole.

As shown in fig. 1 and 2, the piston 2 is located in the cylinder barrel 1, an external thread 21 is arranged on the outer wall of the piston 2, the cylinder barrel 1 and the piston 2 are matched with the external thread 21 through the internal thread 11, and the internal thread 11 and the external thread 21 are both non-self-locking threads. The piston 2 is provided with a ventilation structure, such as a vent hole or a ventilation groove, so that the self-locking compressed gas spring can facilitate gas to flow on two sides of the piston 2 in the lifting working process.

As shown in fig. 1 and 2, one end of a piston rod 3 is connected to the piston 2, and the other end of the piston rod 3 is exposed to the outside of the cylinder 1 through a first seal assembly; the first sealing component and the piston rod 3 form a hermetic fit, so that gas arranged in the cylinder body 1 is prevented from leaking.

As shown in fig. 1 and 2, the cylinder 1 or the piston rod 3 is rotatably mounted on a support assembly 5, so that the cylinder 1 or the piston rod 3 can be rotated and/or moved linearly during the lifting of the self-locking compressed gas spring. The specific movement mode of the cylinder barrel 1 or the piston rod 3 is determined according to the specific use condition, for example, the support component 5 and the locking mechanism 6 are positioned at the lower part of the self-locking type compressed gas spring, when the support component 5 is fixedly connected with the lower part of the mechanism (such as a table foot) needing to be lifted, two conditions are adopted, one is that: the cylinder barrel 1 is connected with the upper part (such as a table top) of a mechanism needing to be lifted, the piston rod 3 is in rotary fit with the supporting component 5, when the self-locking type compression gas spring works, the cylinder barrel 1 makes lifting linear motion, and the piston rod 3 makes rotary motion. The other is as follows: the piston rod 3 is connected with the upper part (such as a table top) of a mechanism needing to be lifted, the cylinder barrel 1 is matched with the supporting component 5 in a rotating mode, when the self-locking type compression gas spring works, the piston rod 3 makes lifting linear motion, and the cylinder barrel 1 makes rotating motion.

When the support assembly 5 and the locking mechanism 6 are located at the upper part of the self-locking compressed gas spring, wherein the support assembly 5 is connected with the upper part (e.g. the table top) of the mechanism to be lifted, there are two cases, one is: the piston rod 3 is fixedly connected with the lower part (such as a table foot) of a mechanism needing to be lifted, the cylinder barrel 1 is in rotary fit with the supporting component 5, when the piston rod 3 works from the self-locking type compression gas spring, the cylinder barrel 1 does lifting linear motion and rotary motion, and the piston rod 3 is fixed. The other is as follows: the cylinder barrel 1 is fixedly connected with the lower part (such as a table foot) of a mechanism needing to be lifted, the piston rod is in rotary fit with the supporting component 5, when the self-locking type compression gas spring works, the piston rod 3 makes lifting linear motion and rotary motion, and the cylinder barrel 1 is fixed.

As shown in fig. 2 and 3, in the present embodiment, the support assembly 5 includes a base 51 and a bearing 52, the bearing 52 is mounted on the base 51, and the cylinder 1 or the piston rod 3 is engaged with the bearing 52. A first cavity 53 is provided on the holder body 51, and the bearing 52 is fitted in the first cavity 53. Preferably, a second cavity 54 is further provided on the seat 51, and the second cavity 54 is communicated with the first cavity 53. The base body 51 is further provided with a guide 55 on the inner wall surface of the second cavity 54, and the guide 55 is used for cooperating with the locking mechanism 6.

As shown in fig. 2, gas is used for generating power, and the gas is arranged in the cylinder 1, and in the unlocked state, the gas acting on the piston 2 and the cylinder 1 or the piston rod 3 connected with the piston 2 move under the matching action of the internal thread 11 and the external thread 21 of the cylinder 1 and the piston 2. The movements of the cylinder 1 and the piston rod 3 are divided into the following two types:

the first method is as follows: when the piston is in the unlocked state, the gas acting on the piston 1 and the piston 2 make the piston 2 rotate under the matching action of the internal threads 11 and the external threads 21 of the cylinder 1 and the piston 2, the piston rod 3 rotates along with the piston 2, and the cylinder 1 moves linearly. The second method is as follows: in the unlocked state, the gas acting on the piston 2 and the cylinder 1 are rotated under the matching action of the internal thread 11 and the external thread 21 of the cylinder 1 and the piston 2, so that the piston 2 and the piston rod 3 move linearly. These two cases are determined by selecting the case where the cylinder 1 or the piston rod 3 is connected to the upper or lower portion (e.g., a table top or a table foot) of the mechanism that requires lifting.

As shown in fig. 2, the locking mechanism 6, when cooperating with the cylinder 1 or the piston rod 3, forms a lock for the moving cylinder 1 or piston rod 3. At least a portion of the locking mechanism 6 is mounted on the support assembly 5. As is apparent from the above description, the movement states of the cylinder 1 and the piston rod 3 have rotational movement and/or linear movement, respectively, and in the present embodiment, the lock mechanism 6 preferentially locks the cylinder 1 or the piston rod 3 in rotational movement, and therefore, the lock mechanism 6 in the present embodiment is a rotational lock mechanism that restricts rotation of the cylinder 1 or the piston rod 3.

As shown in fig. 2 to 4, the rotation locking mechanism includes a gear 61, a positioning member 62, a pulling assembly 63, and an elastic member 64, the gear 61 is fixed with the cylinder 1 or the piston rod 3, the positioning member 62 is engaged with the gear 61 to limit the rotation of the gear 61, and when the gear 61 is limited to rotate, the cylinder 1 or the piston rod 3 is also stopped to rotate, so that the self-locking type compressed gas spring is in a locked state.

As shown in fig. 2 to 4, the positioning member 62 includes a moving seat 62a and a tooth 62b, the tooth 62b is disposed at one end of the moving seat 62a, two sides of the moving seat 62a are respectively provided with a groove 62c, the grooves 62c are in clearance fit with the guide rail 55, and when the moving seat 62a moves, the fit of the grooves 62c and the guide rail 55 forms a guiding function for the positioning member 62, so as to prevent the positioning member 62 from deflecting. A groove 62d is provided on the positioning member 62, and one end of the pulling member 63 is fitted in the groove 62 d. A spring seat 62e is provided at the other end of the movable seat 62a, and a recess 62f or a hole is provided on the spring seat 62e for the pulling member 63 to pass through.

As shown in fig. 2 to 4, the pulling assembly 63 drives the positioning member 62 to separate from the gear 61, and the pulling assembly 63 is connected with the positioning member 62; the traction assembly comprises a sleeve 63a and a cable 63b, wherein one end of the sleeve 63a is fixed with the support assembly 5, preferably, one end of the sleeve 63a is fixed with the seat body 51, the cable 63b passes through the sleeve 63a and then is connected with the positioning component 62, preferably, one end of the cable 63b is provided with a head 63c, the head 63c is positioned in the groove 62d, and the width of the head 63c is larger than that of the notch 62f, so that the head 63c is limited in the groove 62 d.

As shown in fig. 2 to 4, a pulling force is manually applied to the cable 63b, the pulling force is transmitted to the head 63c through the cable 63b, and the head 63c moves the positioning member 62, thereby separating the positioning member 62 from the gear 61. The circumference of the gear wheel 61 is no longer restricted and thus the circumference of the cylinder 1 or the piston rod 3 is no longer restricted, the gas acting on the piston 2 and the cylinder 1 or the piston rod 3 connected to the piston 2 being set into rotational movement by the cooperation of the internal thread 11 of the cylinder 1 and the piston 2 with the external thread 21.

As shown in fig. 2 to 4, the elastic member 64 is fitted over the pulling assembly 63, one end of the elastic member 64 is engaged with the positioning member 62, and the other end of the elastic member 64 is engaged with the pulling assembly 63 or the engagement supporting assembly 5. The elastic component 64 is preferably a spring, one end of the elastic component 64 is sleeved on the spring seat 62e and then forms an abutting against the moving seat 62a, and the other end of the elastic component 64 abuts against the sleeve 63a of the traction assembly 63. When the pulling force is manually applied to the cable 63b, the moving seat 62a compresses the elastic member 64 when moving, the elastic member 64 enables the positioning member 62 to be matched with the gear 61 after the pulling assembly 63 releases the positioning member 62, namely, the pulling force applied to the cable 63b is released, and the positioning member 62 is reset under the action of the elastic member 64, so that the cylinder tube 1 or the piston rod 3 is locked along the circumferential direction.

The present invention is not limited to the above embodiments, for example:

(a) the cylinder 1 can also be of a closed construction at one end, which is integrally formed with the cylinder 1, i.e. the cylinder 1 is not open at one end when the cylinder is manufactured.

(b) As shown in fig. 5, the cylinder barrel 1 comprises an inner cylinder barrel 1a and an outer cylinder barrel 1b, wherein the inner cylinder barrel 1a is made of nonmetal materials, the outer cylinder barrel 1b is sleeved on the inner cylinder barrel, the outer cylinder barrel 1b is made of metal materials, the strength of the inner cylinder barrel 1a is increased through the outer cylinder barrel 1b, and the inner cylinder barrel 1a made of nonmetal materials can be formed through an injection molding mode, so that the manufacturing difficulty of the inner cylinder barrel 1a is reduced.

(c) As shown in fig. 6, the cylinder tube 1 is made of metal, and the internal thread 11 on the inner wall of the cylinder tube 1 is formed by continuous extrusion molding from the outer peripheral surface to the inner peripheral surface in a spiral direction, in such a manner that a spiral groove is formed on the outer wall of the cylinder tube 1 and a thread is formed on the inner wall of the cylinder tube 1. For example, a grooving device as disclosed in CN100460794C is used to extrude a thread on the cylinder barrel 1.

(d) As shown in fig. 2, in embodiment 1, the lock mechanism 6 is a rotation lock mechanism for locking the cylinder 1 or the piston rod 3 which rotates, and in embodiment 1, the movement state in which the cylinder 1 and the piston rod 3 linearly and/or rotationally move is described in detail, and the lock mechanism 6 in the embodiment is a lock mechanism for restricting the rotation of the cylinder 1 or the piston rod 3. The locking mechanism 6 may lock the cylinder 1 or the piston rod 3 in the linear movement, for example, a clasping locking mechanism clasps the cylinder 1 or the piston rod 3 in the linear movement to prevent the cylinder 1 or the piston rod 3 from moving up or down, so that the clasping locking mechanism locks the cylinder 1 or the piston rod 3. The holding-together locking mechanism is also suitable for locking the rotating cylinder barrel 1 or piston rod 3.

As shown in fig. 7, the clasping locking mechanism comprises an inner support 71, an outer support 72, a swing link 73, a clasping block 74 and a pulling rope, wherein one end of the inner support 71 is fixed with the upper part or the lower part (such as a table top or a table leg) of a mechanism needing lifting, the cylinder barrel 1 or the piston rod 3 penetrates through the inner support, the middle part of the swing link 73 is hinged with the inner support 71, one end of the outer support 71 is hinged with one end of the swing link 73, the other end of the swing link 73 is connected with the clasping block 74, and the pulling rope is connected with the outer support. When the cylinder barrel 1 or the piston rod 3 needs to be lifted and lowered, traction force is applied to the pull rope, the swing rod 73 swings, the clasping block 74 generates clasping acting force on the cylinder barrel 1 or the piston rod 3, the cylinder barrel 1 or the piston rod 3 stops lifting and lowering, the pull rope can be fixed to the upper portion or the lower portion (such as a table top or a table foot) of a mechanism needing to be lifted and lowered, and the clasping acting force generated by the clasping block 74 on the cylinder barrel 1 or the piston rod 3 is kept. When the cylinder barrel 1 or the piston rod 3 needs to be lifted, the traction force of the pull rope is released, the swing rod 73 is in a free state, at the moment, the holding block 74 is separated from the cylinder barrel 1 or the piston rod 3, and the holding block 74 does not produce holding acting force on the cylinder barrel 1 or the piston rod 3.

(e) The locking mechanism 6 may also adopt the following structure:

as shown in fig. 8, the brake device comprises a first friction disc 75, a second friction disc 76, a spring 77, a push rod 78 and a guide rod 79, wherein the first friction disc 75 is fixed with the cylinder tube 1 or the piston rod 3, one end of the spring 77 abuts against the second friction disc 76, the other end of the spring 77 abuts against the support component 5, the second friction disc 76 is provided with an assembly hole, one end of the guide rod 79 is connected with the support component 5, and the other end of the guide rod 79 extends into the assembly hole in the second friction disc 76.

The second friction disk 76 is restricted from rotating by the guide rod 79, and in the locked state, the second friction disk 76 is coupled to the first friction disk 75 by the urging force of the spring 77, and the first friction disk 75 is prevented from rotating by the frictional urging force of the first friction disk 75 and the second friction disk 76, thereby locking the cylinder tube 1 or the piston rod 3. The push rod 78 is acted upon to separate the second friction disc 76 from the first friction disc 75, the first friction disc 75 is no longer subjected to frictional force, and the piston 2 rotates the cylinder tube 1 or the piston rod 3 under the cooperation of the gas and the internal thread 11 and the external thread 21.

(f) Locking mechanism 6 may also adopt a splined locking structure, for example, an inner bore is provided at the end of piston rod 3 connected to support assembly 5, a splined groove is provided in the inner bore, locking mechanism 6 includes an axially movable splined shaft, and when the splined shaft extends into the inner bore to form a splined engagement, piston rod 3 cannot rotate. When the spline shaft is separated from the piston rod 3, the piston 2 rotates the piston rod 3 under the action of gas and the cooperation of the internal thread 11 and the external thread 21.

(g) The first sealing assembly can also only adopt a rubber ring, an annular groove is arranged on the inner wall of the cylinder barrel 1, and a part of the rubber ring is fixed in the annular groove. Or the first sealing component consists of an annular framework and an annular sealing element (such as a rubber ring) made of flexible materials, the annular framework is coated with annular sealing performance, an annular groove is formed in the inner wall of the cylinder barrel 1, and a part of the annular framework is fixed in the annular groove.

Claims

1. From locking-type compressed gas spring, its characterized in that includes:

2. The self-locking compressed gas spring as claimed in claim 1, wherein in the unlocked state the gas acting on the piston and the piston are caused to move linearly and/or rotationally by the cylinder barrel in cooperation with the internal and external threads of the piston, the piston rod following the piston.

3. The self-locking compressed gas spring as claimed in claim 1, wherein in the unlocked condition the gas acting on the piston and the cylinder are caused to move linearly and/or rotationally by the cooperation of the cylinder with the internal and external threads of the piston.

4. A self-locking compression gas spring according to one of claims 1 to 3, characterized in that the support assembly comprises:

a base body;

the bearing is arranged on the seat body.

5. A self-locking compressed gas spring as claimed in any one of claims 1 to 3, wherein at least a portion of the locking mechanism is mounted on a support assembly.

6. Self-locking compression gas spring according to one of the claims 1 to 3, wherein the locking mechanism is a rotational locking mechanism limiting the rotation of the cylinder or piston rod.

7. The self-locking compressed gas spring as recited in claim 6, wherein the rotational locking mechanism comprises:

the gear is fixed with the cylinder barrel or the piston rod;

a positioning member for restricting rotation of the gear when engaged with the gear;

the traction assembly is connected with the positioning component;

and the elastic component is sleeved on the traction assembly, one end of the elastic component is matched with the positioning component, and the other end of the elastic component is matched with the traction assembly or the matched supporting assembly.

8. The self-locking compressed gas spring as recited in claim 7, wherein the draft assembly includes:

one end of the sleeve is fixed with the support component;

and the inhaul cable penetrates through the sleeve and then is connected with the positioning component.

9. The self-locking compressed gas spring as claimed in any one of claims 1 to 3, wherein the locking mechanism is a clasping locking mechanism comprising an inner support, an outer support, a pendulum rod, a clasping block, a pull rope, wherein a cylinder or a piston rod passes through the inner support, the middle of the pendulum rod is hinged to the inner support, one end of the outer support is hinged to one end of the pendulum rod, the other end of the pendulum rod is connected to the clasping block, and the pull rope is connected to the outer support.

10. The self-locking compression gas spring as claimed in any one of claims 1 to 3, wherein the locking mechanism comprises a first friction disc, a second friction disc, a spring, a push rod, and a guide rod, the first friction disc is fixed to the cylinder or the piston rod, one end of the spring abuts against the second friction disc, the other end of the spring abuts against the support assembly, the second friction disc is provided with a fitting hole, one end of the guide rod is connected to the support assembly, and the other end of the guide rod extends into the fitting hole of the second friction disc.