Electric Pneumatic Rod

Abstract

Provide electric pneumatic rod, which can reduce the load of motor, increase thrust, can be powered by battery, can realize gas spring automatic lock, and improve stability. [Solution] The electric pneumatic rod comprises a lift rod composed of an outer tube 1 and an inner tube 3, the outer tube being movable along the axial direction of the inner tube, a threaded tube 7 installed inside the lift rod and having a thread installed on its outer wall, a piston rod 8 and a piston 9, the distance between the piston rod and the inner tube of the lift rod does not change, the piston is located at the free end of the piston rod and slip-fits with the inner wall of the threaded tube, a gas spring with a seal guide part installed between the threaded tube and the piston rod, a nut 10 that fits the threaded tube, and a drive unit that is fixed and installed inside the outer tube of the lift rod and used to drive the rotation of the threaded tube.

Description

[Technical field]

[0001] The present invention relates to the technical field of pneumatic rods, in particular to electropneumatic rods. [Background technology]

[0002] A lift chair is a new type of chair that mainly consists of a seat plate, a backrest, a lifting device and chair legs, and can meet the needs of different people for seat height. Existing lifting devices are generally electric, aerodynamic and manual. Manual lifting devices are time-consuming and cumbersome to operate, have poor aesthetics, and are difficult to meet people's increasing living demands. Aerodynamic lifting devices are generally gas springs with self-locking structure, which have beautiful structure and relatively smooth lifting process, but the lifting operation needs to be done manually by people, and cannot carry a large load when lifting manually. For example, in the lift chair in the conventional technology, people need to leave the chair cushion when ascending, and can only descend after sitting on the chair and applying a certain load to the chair cushion, which is inconvenient to use. An electrically-driven lifting device generally consists of a motor, a screw, a screw nut, a sleeve tube, etc., and the screw is rotated via the motor to raise and lower the device. The motor provides power for the entire lifting operation, allowing automatic lifting and lowering. However, if the load on the seat is heavy, the motor's power must be increased accordingly, which increases the volume of the high-power motor and increases the noise level during operation, affecting the user's experience. Summary of the Invention [Problem to be solved by the invention]

[0003] The present utility model aims to propose an electropneumatic rod in order to overcome the drawbacks existing in the prior art.

[0004] To achieve the above objectives, this utility model adopts the following technical solutions:

[0005] The electric pneumatic rod is a lift rod including an outer tube and an inner tube, the outer tube being movable along an axial direction of the inner tube; A gas spring including a threaded tube installed inside the lift rod and having a thread installed on its outer wall, a piston rod and a piston, the distance between the piston rod and the inner tube of the lift rod does not change, the piston is located at the free end of the piston rod and slip-fits with the inner wall of the threaded tube, and a seal guide part is installed between the threaded tube and the piston rod; a nut adapted to fit the threaded pipe and installed on the end of the inner pipe of the lift rod; a driving unit fixed and installed inside the outer tube of the lifting rod, and used to drive the rotation of the threaded tube so that the threaded tube drives the outer tube of the lifting rod to move along the axial direction of the inner tube of the lifting rod; The lift rod is provided with a sleeve tube, and a first guide sleeve is provided between the sleeve tube and the outer tube of the lift rod.

[0006] Preferably, there is no self-locking between the nut and the threaded tube.

[0007] Preferably, the outer wall of the inner tube of the lift rod is provided with first ridges evenly distributed along its axis, the inner wall of the inner tube of the lift rod is provided with first grooves evenly distributed along its axis, and the outer wall of the nut is provided with second ridges matching the first grooves; A second guide sleeve is installed between the outer tube of the lift rod and the inner tube of the lift rod, and the second guide sleeve is fixed and connected to the outer tube of the lift rod. A second groove that fits the second ridge is installed on the inner wall of the second guide sleeve.

[0008] Preferably, the driving unit includes a motor, a gearbox and a controller, and the output end of the motor drives the screw tube to rotate via the gearbox.

[0009] Preferably, an inner pipe plug of the lift rod is installed at an end of the inner tube of the lift rod, which is connected to an end of the piston rod, and a side wall of the inner pipe plug of the lift rod is fixed and connected to an inner wall of the inner tube of the lift rod.

[0010] Preferably, a third protrusion is provided on the side wall of the inner pipe plug of the lift rod, the third protrusion being fitted into the first groove.

[0011] Preferably, a seal plate is fixed and installed on the end of the sleeve tube, and the end of the inner pipe plug of the lift rod passes through the seal plate and is connected to the seal plate via a circlip.

[0012] Preferably, the seal guide component comprises a spacer sleeve, an oil seal, and a rear top sleeve, the oil seal being located between the spacer sleeve and the rear top sleeve, and the rear top sleeve being fixed and connected to an end of the threaded pipe.

[0013] Preferably, the connecting end of the sleeve pipe and the connecting end of the outer pipe of the lift rod are both truncated. Effect of the Invention

[0014] The effects of this utility model are as follows: 1. In this electric pneumatic rod, by driving the rotation of the screw tube through the motor, the outer tube of the lifting rod can move along the axial direction of the inner tube of the lifting rod, realizing the rise or fall of the pneumatic rod; the screw tube itself, together with the piston rod and the piston, etc., constitutes a gas spring; when the electric pneumatic rod is extended, the gas spring has a certain output force, which can reduce the load of the motor and increase the thrust under the same conditions. Since the motor power is smaller than that of the traditional electric actuator motor, it can be powered by the battery, which expands the scope of use of the electric pneumatic rod; and since the motor is installed inside the outer tube of the lifting rod, the overall structure of the electric pneumatic rod is compact, easy to install, and beautiful in structure. 2. In this electric pneumatic rod, the threaded tube, piston rod and piston etc. constitute a non-lockable gas spring, and by controlling the rotation of the motor, the rotation of the threaded tube can be limited, and the automatic locking of the gas spring can be realized, which improves the stability of the electric pneumatic rod. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is a schematic diagram showing the three-dimensional structure of an electric pneumatic rod proposed by the present invention. [Diagram 2] FIG. 2 is a schematic diagram showing the front structure of the electric pneumatic rod proposed by the present utility model. [Diagram 3] FIG. 3 is a schematic diagram showing a cross-sectional structure of the electric pneumatic rod proposed by the present utility model taken along line AA in FIG. 2 . [Figure 4] FIG. 2 is a schematic diagram showing the three-dimensional structure of the inner tube of the lift rod in the electric pneumatic rod proposed by this utility model. [Diagram 5] FIG. 2 is a schematic diagram showing the three-dimensional structure of a nut of an electropneumatic rod proposed by the present utility model. [Figure 6] FIG. 2 is a schematic diagram showing the three-dimensional structure of the inner pipe plug of the lift rod in the electric pneumatic rod proposed by this utility model; [Figure 7] FIG. 2 is a schematic diagram showing the three-dimensional structure of the second guide sleeve of the electric pneumatic rod proposed by the present utility model. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] The technical solutions in the embodiments of the present utility model are clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part, not all, of the embodiments of the present utility model.

[0017] Referring to Figures 1 to 7, the electric pneumatic rod is A lift rod is composed of an outer tube 1 and an inner tube 3, and the outer tube 1 can move along the axial direction of the inner tube 3; A gas spring including a threaded tube 7, a piston rod 8 and a piston 9, which is installed inside the lift rod and has a thread on its outer wall, the distance between the piston rod 8 and the inner tube 3 of the lift rod is not changed, the piston 9 is located at the free end of the piston rod 8 and slip-fits with the inner wall of the threaded tube 7, and a seal guide part is installed between the threaded tube 7 and the piston rod 8; a nut 10 that fits the threaded tube 7 and is installed on the end of the inner tube 3 of the lift rod; a driving unit fixed and installed inside the outer tube 1 of the lifting rod, and used to drive the rotation of the threaded tube 7 so that the threaded tube 7 drives the outer tube 1 of the lifting rod to move along the axial direction of the inner tube 3 of the lifting rod; The lift rod is provided with a sleeve tube 2 which is sleeve-mounted on the outside of the lift rod and has a first guide sleeve 19 disposed between the sleeve tube 2 and the outer tube 1 of the lift rod.

[0018] The nut 10 and the threaded pipe 7 cannot self-lock.

[0019] The outer wall of the inner tube 3 of the lift rod is provided with first ridges 31 evenly distributed along its axis, the inner wall of the inner tube 3 of the lift rod is provided with first grooves 32 evenly distributed along its axis, and the outer wall of the nut 10 is provided with second ridges 101 that fit into the first grooves 32; A second guide sleeve 20 is installed between the outer tube 1 of the lift rod and the inner tube 3 of the lift rod, and the second guide sleeve 20 is fixed and connected to the outer tube 1 of the lift rod. A second groove 201 that fits the second protrusion 101 is installed on the inner wall of the second guide sleeve 20.

[0020] The driving unit includes a motor 4, a gearbox and a controller, the output end of the motor 4 drives the rotation of the threaded tube 7 through the gearbox 5, and the controller is a Hall encoder or other signal feedback unit. A double-eared rear plug 6 may be attached to the end of the threaded tube 3, and the double-eared rear plug 6 may be connected to the output shaft of the gearbox 5 through matching with the pin shaft, and the output end of the gearbox 5 may be connected to the end of the threaded tube 3 through a coupling.

[0021] An inner pipe plug 14 of the lift rod connected to an end of the piston rod 8 is installed at the end of the inner tube 3 of the lift rod, and a side wall of the inner pipe plug 14 of the lift rod is fixed and connected to the inner wall of the inner tube 3 of the lift rod. A bearing 16 is installed between the inner pipe plug of the lift rod and the piston rod 8, and a pipe plug steaming cover 15 for restricting the position of the bearing in the axial direction is further fixedly installed on the inner pipe plug 14 of the lift rod.

[0022] A third ridge 141 that fits into the first groove 32 is provided on the side wall of the inner pipe plug 14 of the lift rod.

[0023] A top cover 18 of the outer tube of the lift rod is fixedly attached to the top end of the outer tube of the lift rod.

[0024] A seal plate is fixed and installed at the end of the sleeve tube 2 , and the end of the inner pipe plug 14 of the lift rod passes through the seal plate and is connected to the seal plate via a circlip 17 .

[0025] The seal guide part comprises a spacer sleeve 11, an oil seal 12 and a rear top sleeve 13, the oil seal 12 being located between the spacer sleeve 11 and the rear top sleeve 13, and the rear top sleeve 13 being fixed and connected to the end of the threaded pipe 7.

[0026] The connecting end of the sleeve tube 2 and the connecting end of the outer tube 1 of the lift rod are both in the shape of a circular truncated disk. That is, the ends of the sleeve tube 2 and the outer tube 1 of the lift rod have a set angle for taper fitting, similar to the current conventional pneumatic rod connecting method.

[0027] In this electric pneumatic rod, the motor 4 drives the rotation of the screw tube 7, so that the outer tube 1 of the lift rod moves along the axial direction of the inner tube 3 of the lift rod, thereby realizing the lifting or lowering of the pneumatic rod. The screw tube 7 itself, together with the piston rod 8 and the piston 9, constitutes a gas spring, and when the electric pneumatic rod is extended, the gas spring has a certain output force, which can reduce the load of the motor 4 and increase the thrust under the same conditions. The power of the motor 4 is smaller than that of the conventional push rod, so it can be powered by a battery, which expands the scope of use of the electric pneumatic rod, and the motor is installed inside the outer tube of the lift rod, so the overall structure of the electric pneumatic rod is compact, easy to install, and beautiful in structure.

[0028] In this electric pneumatic rod, the threaded tube 7, the piston rod 8, the piston 9, etc. form a non-lockable gas spring, and by controlling the rotation of the motor 4, the rotation of the threaded tube 7 can be limited to realize automatic locking of the gas spring, thereby improving the stability of the electric pneumatic rod.

[0029] The above is only a preferred specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent replacement or modification made by a person skilled in the art based on the technical solution of the present utility model and the idea of ​​the utility model within the technical scope disclosed by the present utility model should be included in the protection scope of the present utility model. [Explanation of symbols]

[0030] 1. Outer tube of lift rod 2 Sleeve pipe 3. Lift rod inner tube 4 Motors 5 Gearbox 6 Binaural rear plugs 7 Threaded Pipe 8 Piston rod 9 Piston 10 Nut 11 Spacer sleeve 12 Oil seal 13 Rear Top Sleeve 14 Lift rod inner pipe plug 15 Pipe stopper steamer lid 16 Bearings 17 Circlip 18 Top cover of outer tube of lift rod 19 First guide sleeve 20 Second guide sleeve 31 First convex strip 32 First Groove 101 Second convex strip 141 Third ridge 201 Second Groove

Claims

1. An electro-pneumatic rod, a lift rod including an outer tube and an inner tube, the outer tube being movable along an axial direction of the inner tube; A gas spring including a threaded tube, a piston rod and a piston, the distance between the piston rod and the inner tube of the lift rod does not change, the piston is located at the free end of the piston rod and slip-fits with the inner wall of the threaded tube, and a seal guide is installed between the threaded tube and the piston rod; a nut adapted to fit the threaded pipe and installed on the end of the inner pipe of the lift rod; a driving unit, which is fixed and installed inside the outer tube of the lifting rod, and is used to drive the rotation of the threaded tube, so that the threaded tube can drive the outer tube of the lifting rod to move along the axial direction of the inner tube of the lifting rod; a sleeve tube that is sleeve-mounted on the outside of the lift rod, and a first guide sleeve is mounted between the sleeve tube and an outer tube of the lift rod.

2. 2. The electric pneumatic rod according to claim 1, wherein the nut and the threaded tube are not self-locking.

3. The outer wall of the inner tube of the lift rod is provided with first ridges evenly distributed along its axis, the inner wall of the inner tube of the lift rod is provided with first grooves evenly distributed along its axis, and the outer wall of the nut is provided with second ridges matching the first grooves; The electro-pneumatic rod according to claim 2, characterized in that a second guide sleeve is installed between the outer tube of the lift rod and the inner tube of the lift rod, the second guide sleeve is fixed and connected to the outer tube of the lift rod, and a second groove is installed on the inner wall of the second guide sleeve, which is matched with the second protrusion.

4. The electric pneumatic rod according to claim 1, wherein the driving unit comprises a motor, a gearbox and a controller, and an output end of the motor drives the screw tube to rotate through the gearbox.

5. 4. The electro-pneumatic rod according to claim 3, wherein an end of the inner tube of the lifting rod is provided with an inner tube pipe plug of the lifting rod, which is connected to an end of the piston rod, and a side wall of the inner tube pipe plug of the lifting rod is fixed and connected to the inner wall of the inner tube of the lifting rod.

6. 6. The electric pneumatic rod as claimed in claim 5, wherein a third protrusion is provided on the side wall of the inner tube of the lift rod, the third protrusion being fitted into the first groove.

7. The electric pneumatic rod according to claim 6, characterized in that a seal plate is fixed and installed on the end of the sleeve tube, and the end of the inner tube plug of the lift rod passes through the seal plate and is connected to the seal plate via a circlip.

8. The electric pneumatic rod according to any one of claims 1 to 7, characterized in that the seal guide part comprises a spacer sleeve, an oil seal, and a rear top sleeve, the oil seal is located between the spacer sleeve and the rear top sleeve, and the rear top sleeve is fixed and connected to the end of the threaded pipe.

9. 9. The electro-pneumatic rod according to claim 8, wherein the connecting end of the sleeve pipe and the connecting end of the outer pipe of the lift rod are both in a truncated circular shape.

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