WO2018072188A1

WO2018072188A1 - Rigid locking pneumatic rod

Info

Publication number: WO2018072188A1
Application number: PCT/CN2016/102778
Authority: WO
Inventors: 陶声荣
Original assignee: 安徽莱特气弹簧有限公司
Priority date: 2016-10-20
Filing date: 2016-10-20
Publication date: 2018-04-26

Abstract

A rigid locking pneumatic rod. An inner pipe (2) is located in an outer pipe (1), and one end of the inner pipe (2) is fixed to one end of a support (11); a piston (4) is assembled at one end of a piston rod (3); the end, assembled with the piston (4), of the piston rod (3) is fitted in the inner pipe (2); the other end of the piston rod (3) sequentially passes through the support (11), a sealing component (9) and a rear ejector sleeve (10), and is then exposed outside the outer pipe (1); a floating piston (8) is fitted between the outer pipe (1) and the inner pipe (2); one end of a valve seat (5) is fixed and sealed with the other end of the inner pipe (2), and the other end of the valve seat (5) is sealed and fixed in the outer pipe (1); the valve seat (5) is axially limited by one end of the rear plug (7), and the other end of the rear plug (7) is exposed outside the outer pipe (1); a through hole is formed in the rear plug (7). The rigid locking pneumatic rod can enable a piston rod to be rigidly locked at any position.

Description

Rigid locking gas pressure bar

Technical field

The present invention relates to a gas pressure bar, and more particularly to a rigid locking gas pressure bar.

Background technique

At present, gas springs and gas pressure bars can be widely used in daily life, especially in office furniture, and are the main components of lifting tables and chairs.

In the prior art, the gas spring and the gas pressure bar cannot be rigidly locked, and have elasticity when self-locking. When the pressure is lowered to a low position, the force value is too large, the operation is limited, and the adjustment is cumbersome and lacks simplicity. In the prior art, the piston valve body and the switch valve needle used in the lockable gas spring have a diameter of 4 mm, and the friction force is relatively large, which causes the start and resilience of the switch to increase, and the assembly and fixation of the piston rod and the piston valve body are compared. It is cumbersome; in addition, the sealing surface of the piston rod and the piston body sealing end is difficult to process, and it is difficult to achieve the required precision. The piston rod is a hollow rod, the control valve and the piston rod move at the same time, and are not fixed. The switch is at the end of the piston rod, and the installation is used. Limitations, and because of the structural process leading to heat treatment of the piston rod surface, the inner hole sealing surface can not be polished, the sealing effect is worse, causing problems such as chronic gas leakage and oil leakage.

Summary of the invention

It is an object of the present invention to provide a rigid locking gas pressure bar in which the piston rod can be rigidly locked at any position.

The technical solution of the present invention is as follows:

The rigid locking gas pressure bar comprises an outer tube, an inner tube, a piston rod, a piston, a valve seat, a valve core, a rear plug, a floating piston, a sealing assembly, a rear top sleeve, a bearing having a venting hole, and the bearing is located in the outer tube and The outer tube is fastened into one body, the inner tube is located in the outer tube, one end of the inner tube is fixed to one end of the support, the sealing assembly is disposed in the outer tube and is located at one side of the other end of the support, and the rear top sleeve is fixed at one end of the outer tube. One end of the rear sleeve forms an axial limit on the seal assembly, the piston is assembled at one end of the piston rod, and one end of the piston rod assembly piston fits into the inner tube to divide the inner tube into an inner oil chamber and an inner air chamber. The other end of the piston rod is sequentially exposed from the support, the seal assembly and the rear top cover to the outside of the outer tube, and the floating piston is fitted between the outer tube and the inner tube to separate the cavity between the outer tube and the inner tube. An oil chamber and an outer air chamber, one end of the valve seat is fixed and sealed to the other end of the inner tube, and the other end of the valve seat is sealed and fixed in the outer tube, and the valve seat is provided with an axial stepped hole and a radial Oil hole, oil hole and step hole form oil passage One end of the valve core is provided with an annular flange for sealing the hole of the stepped hole, and the rear block is fixed at the other end of the outer tube. One end of the rear plug forms an axial limit to the valve seat, and the other end of the rear plug is exposed to the outer tube. Externally, the rear plug is provided with a through hole, and the other end of the valve core passes through the through hole from the stepped hole of the valve seat and the rear plug.

The utility model has the beneficial effects that the rigid locking gas pressure bar is designed by the separating mechanism of the gas and the oil chamber, so that the gas pressure bar can be fully rigidly locked at any position and direction, and the falling and rising force values are uniform, and the pressure can be easily pressed. It not only solves the elastic drawbacks of the traditional gas pressure rod, but also solves the single direction and limitation of the switching direction of the lockable gas spring and the piston rod and the piston valve body. Its simple piston rod and piston structure reduces the difficulty of processing and assembly, increases the sealing effect, reduces the friction of the switch, and reduces oil leakage and air leakage, thus making the gas spring lift softer and smoother, ensuring Long-term sealing effect and lifting effect improve user experience comfort and reduce production and processing costs.

DRAWINGS

1 is a schematic cross-sectional structural view of a rigid locking gas pressure bar of the present invention;

Figure 2 is a schematic view showing the addition of a control member on the basis of Figure 1;

Figure 3 is a schematic view of the valve body of the present invention;

Figure 4 is a schematic view of the connection assembly of the present invention;

Figure 5 is a schematic view of the tail plug connector of the present invention;

Figure 6 is a schematic view of the cable connector of the present invention;

Figure 7 is a schematic view of the steering assembly of the present invention;

Figure 8 is a schematic view of the driving lever of the present invention;

Figure 9 is a schematic view of a support base in the present invention;

detailed description

As shown in FIG. 1 and FIG. 2, the rigid locking gas pressure bar of the present invention comprises an outer tube 1, an inner tube 2, a piston rod 3, a piston 4, a valve seat 5, a valve core 6, a rear plug 7, a floating piston 8, and a seal. The assembly 9, the rear top cover 10, the support 11 having the venting holes, the spacer 12, and the control member 13, the following describes each part and the relationship between them:

As shown in FIG. 1 to FIG. 3, the support 11 is located in the outer tube 1 and is integrally fastened with the outer tube 1. The inner tube 2 is located in the outer tube 1, and one end of the inner tube 2 is fixed to one end of the support 11. The end of the seat 11 connected to the inner tube 2 is provided with a boss portion 11a which is inserted into the inner tube 2. After the boss portion 11a is provided, the seat 11 has a T-shape. Preferably, the seat 11 is interference-fitted with the outer tube 1, and the boss portion 11a is interference-fitted with the inner tube 2, so that the outer tube is passed through the seat 11. 1 and one end of the inner tube 2 is fastened together. The sealing assembly 9 is disposed in the outer tube 1 and on the side of the other end of the support 11, that is, the seal assembly 9 and the support 11 are spaced apart, so that the outer tube 1, the sealing assembly 9, and the support 11 enclose a breathable portion. In the cavity, since the venting hole is provided on the support 11, the venting cavity and the venting hole and the outer tube and the inner cavity form a passage for the flow of the compressed gas. The sealing assembly 9 is composed of a bracket and a sealing ring which is covered and fixed on the bracket. The rear top cover 10 is fixed at one end of the outer tube 1. One end of the rear top sleeve 10 forms an axial limit on the sealing assembly 9, and the rear top sleeve 10 is interference fit in the outer tube 1. The end of the outer tube 1 is The collar is bent to form a retaining ring, and the other end of the rear top cover 10 is axially restricted by the retaining ring. The piston 4 is assembled at one end of the piston rod 3, and one end of the piston rod 3 assembly piston 4 is fitted into the inner tube 2 to divide the inner tube 2 into an inner oil chamber 2a and an inner air chamber 2b, and the other end of the piston rod 3 It is exposed to the outside of the outer tube 1 after passing through the holder 11, the seal assembly 9, and the rear top cover 10 in this order. The floating piston 8 is fitted between the outer tube 1 and the inner tube 2 to separate the cavity between the outer tube 1 and the inner tube 2 into an outer oil chamber 1a and an outer air chamber 1b. The outer oil chamber 1a and the inner oil chamber 2a are filled with oil, and the outer air chamber 1b and the inner air chamber 2b are filled with compressed gas, and the piston rod 3 is loosely fitted with the support 11, so that the compressed gas can pass through the piston A gap between the rod 3 and the support 11, a gas permeable cavity, a vent hole, and a flow back and forth between the inner gas chamber 2b and the outer air chamber 1b.

One end of the valve seat 5 is fixed and sealed to the other end of the inner tube 2. The other end of the valve seat 5 is sealed and fixed in the outer tube 1. The valve seat 5 is provided with an axial stepped hole 5a and a radial oil hole 5b. The oil hole 5b forms an oil passage with the stepped hole 5a, and the oil can flow back and forth between the outer oil chamber 1a and the inner oil chamber 2a through the oil hole 5b and the stepped hole 5a. One end of the valve core 6 is provided with an annular flange for sealing the orifice of the stepped hole, and the rear plug 7 is fixed at the other end of the outer tube 1. One end of the rear plug 7 forms an axial limit to the valve seat 5, and the other of the rear block 7 One end is exposed to the outside of the outer tube 1, and the rear block 7 is provided with a through hole. The other end of the valve body 6 passes through the through hole from the stepped hole 5a of the valve seat 5 and the rear block 7. The valve core 6 includes a valve stem 6a and a push rod 6b. One end of the valve stem 6a abuts against one end of the push rod 6b, the through hole on the rear plug 7 is a stepped hole, and the push rod 6b is provided with a radial When the projection 6c and the push rod 6b are displaced in the axial direction, the projection 6c is limited by the step surface of the stepped hole on the rear plug 7. The spacer 12 is located in the stepped hole in the valve seat 5, and the spacer 12 is sleeved on the valve core 6. Specifically, the spacer 12 is sleeved on the valve stem 6a, and the hole 12a is provided on the circumferential surface of the spacer 12, the hole 12a forms a passage for the oil passage together with the oil hole 5b and the stepped hole 5a.

As shown in FIG. 2, the end portion of the rear plug 7 exposed to the outside of the outer tube 1 is connected with a control member 13 that controls the axial movement of the spool 6 to open and close the oil passage. The control member 13 includes a connecting assembly 14 and a steering assembly 15 that drives the connecting assembly to apply an axial force to the spool 6 and to the connecting assembly.

As shown in Figures 2, 4 to 6, the connecting assembly 14 is connected to the end of the tail plug exposed to the outside of the outer tube 1, and the connecting assembly 14 comprises: a tail plug connector 14a, a cable connector 14b, and one end of the tail plug connector 14a. A mounting hole 14c is disposed axially along the tail plug connector 14a. The tail plug 7 is fastened to the tail plug connector after extending into the mounting hole. Preferably, the tail plug 7 is provided with an external thread, and the mounting hole 14c is disposed. The wall surface is provided with internal threads, and the tail plug 7 is screwed to the tail plug connector 14a. The side wall of the tail plug connector 14a is provided with a mounting groove 14d. The mounting groove 14d is arranged radially along the tail plug connector and communicates with the mounting hole 14c. The side wall of the tail plug connector 14a is further provided with a mounting groove 14d. Support block 14e on both sides of the slot; cable connector 14b hinged On the support block 14e, the cable connecting member 14b is substantially arcuate, and one end of the cable connecting member 14b is provided with a connecting portion, and the connecting portion includes two rings 14f having radial notches, and the two rings 14f are spaced apart. The notches of the two rings 14f are staggered, and a shaft hole 14g is provided at a central portion of the cable connecting member 14b to hinge the cable connecting member 14b to the supporting block 14e through the shaft. A portion of the cable connector 14b is located in the mounting groove 14d and abuts against the push rod 6b of the spool 6.

As shown in Figures 2, 7 to 9, the steering assembly 15 includes a cable 15a, a driving lever 15b, and a support base 15c. One end of the driving lever 15b is provided with a sleeve 15d for receiving and connecting the cable pulling head, and is driven. The lever 15b is provided with an arcuate groove 15e on the end surface of the sleeve, and a handle 15f is provided on the other side of the drive lever 15b. The handle 15f protrudes from the surface of the drive lever 15b, and the handle 15f is provided with a finger-fitted finger. The matching slot has three matching slots for adapting the index finger, the middle finger and the ring finger respectively. The driving lever 15b is further provided with a connecting post 15g. The connecting post 15g is a hollow connecting post. A corner of the driving lever 15b is provided with a notch, and the notch has a circular arc shape. The support base 15c is provided with a guiding member 15h. The support base 15c has a receiving cavity. The guiding member 15h is a cylinder. The cylinder is hollow. The supporting base 15c is further provided with a first connecting post 15i and a second connecting post 15j. The guiding member 15h, the first connecting post 15i and the second connecting post 15j are all located in the receiving cavity of the support base 15c, and the connections of the three constitute a three-corner shape. The drive lever 15b is hinged to the support base 15c. Specifically, when the support base 15c is assembled with the drive lever 15b, the guide member 15h passes through the arcuate groove 15e, and the guide member 15h is clearance-fitted to the arcuate groove 15e on the drive lever 15b. in. The connecting post 15g corresponds to the first connecting post 15i and the two are connected by screws such that the driving lever 15b is hinged with the supporting seat 15c, and the second connecting post 15j corresponds to the arcuate notch on the driving lever 15b. One end of the cable 15a is connected to the sleeve 15d on the drive lever 15b, and the other end of the cable 15a is passed from the support base 15c to be connected to the cable connector 14b.

In a specific operation, the operator's hand holds the driving lever 15b from the matching groove on the driving lever 15b, and applies a force to the driving lever 15b, and the driving lever 15b rotates around the hinge point of the connecting post 15g and the first connecting post 15i. During the rotation of the driving lever 15b, the guiding member 15h guides the driving lever, the driving lever 15b drives the cable 15a to retract in the circumferential direction of the sleeve 15d, and the cable 15a drives the cable connecting member 14b to rotate, and the cable connection The push rod 6b of the top-loading valve core 6 of the piece 14 is displaced, and the push rod 6b pushes the valve rod 6a, so that the stepped hole hole sealed by the valve body 6 on the valve seat 5 is opened, and the piston rod or the outer rod is pushed by the external force. The tube 1 causes the oil to flow between the inner oil chamber and the outer oil chamber, so that the gas flows between the outer air chamber and the inner air chamber, thereby changing the extension length of the piston rod to achieve the purpose of adjustment. When the protruding length of the piston rod reaches a proper position, no force is applied to the driving lever 15b, and the pressure of the compressed gas is transmitted to the oil in the inner oil chamber through the piston 4, and the oil transmits the pressure to the spool 6, so that the oil transmits the pressure to the spool 6. The spool 6 is axially displaced and reset, and the spool 6 will seat The stepped orifice of the 5 is closed so that oil and gas are not allowed to flow back and forth in the cavity, and the position of the piston rod 3 is locked.

Claims

Rigid locking gas pressure bar, including outer tube (1), inner tube (2), piston rod (3), piston (4), valve seat (5), valve core (6), rear block (7), floating piston ( 8) a sealing assembly (9), a rear top cover (10), a support (11) having a venting hole, the support (11) being located in the outer tube (1) and fastened integrally with the outer tube (1), The inner tube (2) is located in the outer tube (1), one end of the inner tube (2) is fixed to one end of the support (11), and the sealing assembly (9) is disposed in the outer tube (1) and located at the support (11) One side of one end, the rear top cover (10) is fixed at one end of the outer tube (1), one end of the rear top sleeve forms an axial limit on the sealing assembly (9), and the piston (4) is assembled on the piston rod ( At one end of 3), one end of the piston rod (3) assembly piston (4) is fitted in the inner tube (2) to divide the inner tube (2) into an inner oil chamber (2a) and an inner air chamber (2b), the piston The other end of the rod (3) is sequentially exposed from the support (11), the seal assembly (9), and the rear top cover (10) to the outside of the outer tube (1), and the floating piston (8) is fitted to the outer tube (1) Separating the cavity between the outer tube (1) and the inner tube (2) with the inner tube (2) into an outer oil chamber (1a) and an outer air chamber (1b), the valve seat (5) One end is fixed to the other end of the inner tube (2) Sealed, the other end of the valve seat (5) is sealed and fixed in the outer tube (1). The valve seat (5) is provided with an axial stepped hole and a radial oil hole, and the oil hole and the step hole form an oil passage. One end of the valve core (6) is provided with an annular flange for sealing the orifice of the stepped hole, and the rear plug (7) is fixed at the other end of the outer tube (1), and one end of the rear plug (7) is formed for the valve seat (5). The axial limit, the other end of the rear plug (7) is exposed to the outside of the outer tube (1), the rear plug (7) is provided with a through hole, and the other end of the spool (6) is sequentially from the valve seat (5) The stepped hole and the through hole on the back plug pass through.
The rigid locking gas pressure bar according to claim 1, characterized in that the end portion of the support (11) connected to the inner tube (2) is provided with a convex portion (11a), and the convex portion (11a) is inserted. Into the inner tube.
The rigid locking gas pressure bar according to claim 1, characterized in that the valve core (6) comprises a valve stem (6a), a push rod (6b), one end of the valve stem (6a) and the push rod (6b) One end abuts against the top, the through hole on the rear plug (7) is a stepped hole, and the push rod (6b) is provided with a radial protrusion (6c), and when the push rod (6b) is displaced in the axial direction, the protrusion ( 6c) Restricted by the step surface of the stepped hole on the back plug (7).
The rigid locking air pressure bar according to claim 1, further comprising a spacer (12), the spacer (12) is located in the stepped hole in the valve seat (5), and the spacer (12) is sleeved on the valve On the core (6), a hole (12a) is provided on the circumferential surface of the spacer (12).
The rigid locking gas pressure bar according to any one of claims 1 to 4, characterized in that the end of the rear plug (7) exposed to the outside of the outer tube (1) is connected with the axial direction of the control spool (6) A control member (13) that moves to open and close the oil passage.
A rigid locking gas pressure bar according to claim 4, wherein said control member (13) comprises:

a connecting component (14) connected to an end of the tail plug exposed to the outside of the outer tube (1);

The drive assembly (15) that applies an axial force to the spool (6) and is coupled to the connection assembly.
A rigid locking gas pressure bar according to claim 5, wherein said connecting assembly (14) comprises:

a tail plug connector (14a), one end of the tail plug connector (14a) is provided with an axially arranged mounting hole (14c) along the tail plug connector, and the tail plug (7) extends into the mounting hole and is connected with the tail plug The member (14a) is fastened, and the side wall of the tail plug connector (14a) is provided with a mounting groove (14d), and the mounting groove (14d) is radially arranged along the tail plug connector (14a) and the mounting hole (14c) Connected, the side wall of the tail plug connector (14c) is further provided with a support block (14e) on both sides of the slot of the mounting slot;

A cable connector (14b) hinged to the support block, a portion of the cable connector (14b) is located in the mounting groove (14d) and abuts against the spool (6).
The rigid locking air pressure bar of claim 5 wherein said steering assembly (15) comprises:

Cable (15a);

a driving lever (15b), one end of the driving lever (15b) is provided with a sleeve (15d) for receiving and connecting the cable pulling head, and the driving lever (15b) is provided with an arcuate groove (15e) on the end surface of the sleeve ;

a support base (15c), a support member (15h) is provided with a guide member (15h), the drive lever (15b) is hinged with the support base (15c), and the guide member (15h) is clearance-fitted to the drive lever (15b) In the upper arc groove (15e).