Pneumatic lifter and pneumatic lift platform

Abstract

The present invention discloses a pneumatic lifter, which belongs to the field of height-adjustable furniture, and includes a gas storage tube and a first piston rod at least partially located in the gas storage tube, wherein the first piston rod includes a first piston and a first rod body, wherein the first rod body at least partially extends out of the gas storage tube, and the inner cavity of the gas storage tube is divided into two floating chambers by the first piston, wherein the floating chamber far from the first rod body is an air pressure adjustable chamber, wherein a second piston is arranged in the air pressure adjustable chamber, wherein the second piston is connected to a driver, and wherein the second piston moves axially relative to the gas storage tube under the action of the driver to change the air pressure in the air pressure adjustable chamber. The present invention also discloses a pneumatic lifting platform using the above-mentioned pneumatic lifter. The advantage of the present invention is that the driving force provided by the pneumatic lifter is adjustable, and at the same time, the structure of the entire pneumatic lifter is relatively compact.

Description

[Technical field]

[0001] The invention relates to a pneumatic lifter and a pneumatic lift platform, belonging to the field of height-adjustable furniture. [Background technology]

[0002] At present, most of the height-adjustable furniture, such as lifting tables, are electric lifting tables. The main structure of this type of electric lifting table includes a driving motor, a rotating screw, and a transmission nut. The driving motor is used to drive the rotating screw to rotate, and then the transmission nut is driven to move relatively to achieve the lifting of the lifting table. The advantages of this type of electric lifting are strong power load and excellent lifting precision control.

[0003] However, one of the biggest drawbacks of this type of product is its high cost. Because of the large number of internal components and the high precision required for transmission, it is difficult to reduce the cost of this type of product, which is unaffordable for users with limited budgets. Therefore, some pneumatic lifting platforms have begun to appear on the market, such as pneumatic lifting tables. The main driving force of this type of pneumatic lifting table comes from gas springs. The cost of gas springs is obviously much lower than that of electric drive. However, pneumatic drive also has disadvantages. Usually, the driving force that the gas spring itself can provide is relatively fixed. For users, the items placed on the lifting table will change, which causes the load of the lifting table to change. The elastic force provided by the gas spring is relatively fixed, which will cause the elastic force to be too large or too small, resulting in difficulty in rising or too fast rising speed affecting others, causing the risk of injury to objects or people around. [Summary of the invention]

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a pneumatic lifter and a pneumatic lift platform, so that the driving force provided by the pneumatic lifter is adjustable and the structure of the entire pneumatic lifter is relatively compact.

[0005] To solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A pneumatic lifter includes an air storage pipe and a first piston rod at least partially located in the air storage pipe, the first piston rod includes a first piston and a first rod body, the first rod body at least partially extends out of the air storage pipe, the inner cavity of the air storage pipe is divided into two floating chambers by the first piston, and the floating chamber on the side away from the first rod body of the two floating chambers is an air pressure adjustable chamber, a second piston is provided in the air pressure adjustable chamber, the second piston is connected to a driver, and the second piston moves axially relative to the air storage pipe under the action of the driver to change the air pressure in the air pressure adjustable chamber.

[0007] The beneficial effects of the present invention are as follows:

[0008] In the present invention, the interior of the gas storage tube is divided into two floating chambers by the first piston. Since the first piston itself is movable, the two floating chambers are not fixed chambers, but floating variable chambers. Usually, the air pressure in the floating chamber away from the side of the first rod body is greater than the air pressure in the floating chamber on the other side, thereby generating a thrust on the first piston rod. In the present invention, the floating chamber away from the side of the first rod body is configured as an air pressure adjustable chamber, which is equivalent to the air pressure in this floating chamber being artificially regulated, so that the thrust on the first piston rod can be adjusted. By using this air pressure adjustable method, the driving force or elastic force provided by the pneumatic lifter in the present invention can be artificially adjusted according to actual conditions, which makes the application range of the pneumatic lifter wider. If the pneumatic lifter is used in a lifting table product, the driving force provided by the pneumatic lifter can be adjusted according to the weight of the items placed on the lifting table, which is safer.

[0009] At the same time, in the present invention, the adjustment in the air pressure adjustable chamber is mainly carried out by a built-in second piston, that is, the air pressure adjustable chamber is shared with the floating chamber in the original pneumatic lifter. Because the traditional pneumatic lifter itself has a floating chamber, and this embodiment just takes advantage of this existing floating chamber and improves it, so that the floating chamber is not only an air pressure chamber that provides thrust to the first piston rod, but also a chamber that can use the second piston to adjust the air pressure. Using one chamber to complete two functions is obviously more compact in overall structure, which is very beneficial for some furniture products with relatively cramped internal installation space.

[0010] Preferably, the driver includes a rotating screw, and a threaded hole is provided at the end of the gas storage tube away from the first rod body. The rotating screw is threadedly matched with the threaded hole, and the end of the rotating screw is connected to the second piston. When the rotating screw rotates, the second piston is pushed.

[0011] Preferably, the second piston and the rotating screw rod abut against each other, and a plane bearing is provided between the second piston and the rotating screw rod.

[0012] Preferably, the gas storage pipe is provided with a guide sleeve on one side of the inner end of the threaded hole for positioning the rotating screw.

[0013] Preferably, the driver comprises a rotating screw, and the second piston is provided with a nut, the nut is threadably matched with the rotating screw, and the rotating screw drives the nut to move axially when it rotates.

[0014] Preferably, the second piston comprises a hollow cavity, one end portion of the second piston is provided with a threaded hole, and one end of the rotating screw extends into the hollow cavity through the threaded hole.

[0015] Preferably, a controllable valve is provided on the first piston, and the controllable valve is used to control the air pressure balance between the two floating chambers.

[0016] Preferably, the end of the rotating screw rod extends out of the air storage pipe and is connected to the driving motor; or, the end of the rotating screw rod extends out of the air storage pipe and is connected to a hand-cranked mechanism, and the hand-cranked mechanism drives the rotating screw rod to rotate.

[0017] The present invention also discloses a pneumatic lifting platform, comprising a lifting column, wherein the lifting column comprises a first telescopic sleeve, a second telescopic sleeve and a driving lifter, wherein the second telescopic sleeve is sleeved outside the first telescopic sleeve, and the first telescopic sleeve and the second telescopic sleeve of the driving lifter move axially relative to each other, and the driving lifter adopts the pneumatic lifter described in any of the above-mentioned schemes.

[0018] Preferably, the driver comprises a rotating screw and a nut threadably matched with the rotating screw, the rotating screw is connected to a driving motor, and the pneumatic lifting platform comprises a hand controller for connecting to and controlling the driving motor.

[0019] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings.

Brief Description of the Drawings

[0020] The present invention will be further described below in conjunction with the accompanying drawings:

[0021] Figure 1 This is an overall schematic diagram of a pneumatic lifter according to an embodiment of the present invention;

[0022] Figure 2 It is a cross-sectional schematic diagram of a pneumatic lifter according to an embodiment of the present invention;

[0023] Figure 3 It is a cross-sectional schematic diagram of a pneumatic lifter according to a second embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the overall structure of a pneumatic lifting platform according to a third embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the exploded view of the pneumatic lifting platform according to the third embodiment of the present invention. [Specific implementation method]

[0026] The technical solutions of the embodiments of the present invention are explained and described below in conjunction with the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the present invention.

[0027] In the following description, terms such as "inside", "outside", "up", "down", "left", "right", etc. that indicate orientation or position relationship are based on the orientation or position relationship shown in the drawings and are only for the convenience of describing the embodiments and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention.

[0028] Embodiment 1:

[0029] like Figure 1 to Figure 2 As shown, this embodiment shows a pneumatic lifter, including an air storage pipe 3 and a first piston rod 1 at least partially located in the air storage pipe 3, the first piston rod 1 includes a first piston 11 and a first rod body 12, the first rod body 12 at least partially extends out of the air storage pipe 3, and the inner cavity of the air storage pipe 3 is divided into two floating chambers by the first piston 11. Figure 2 For example, above the first piston 11 is the first floating chamber 301, and below the first piston 11 is the second floating chamber 302. Among the two floating chambers, the floating chamber away from the first rod body 12, that is, the second floating chamber 302 is an air pressure adjustable chamber. A second piston 22 is provided in the air pressure adjustable chamber, and the second piston 22 is connected to a driver. Under the action of the driver, the second piston 22 moves axially relative to the air storage pipe 3 to change the air pressure in the air pressure adjustable chamber.

[0030] In this embodiment, the interior of the gas storage tube 3 is divided into two floating chambers by the first piston 11. Since the first piston 11 itself is movable, the two floating chambers are not fixed chambers, but floating variable chambers. Usually, the air pressure in the floating chamber far away from the first rod body 12 is greater than the air pressure in the floating chamber on the other side, thereby generating thrust on the first piston rod 1. In the present invention, the floating chamber far away from the first rod body 12, i.e. Figure 2 The second floating chamber 302 is configured as an air pressure adjustable chamber, which is equivalent to the air pressure in the floating chamber being manually adjustable, so that the thrust on the first piston rod 1 can be adjusted. By using this air pressure adjustable method, the driving force or elastic force provided by the pneumatic lifter in the present invention can be manually adjusted according to actual conditions, which makes the application range of the pneumatic lifter wider. If the pneumatic lifter is used on a lifting table product, the user can adjust the driving force provided by the pneumatic lifter according to the items placed on the lifting table, which will be safer.

[0031] At the same time, in this embodiment, the adjustment in the air pressure adjustable chamber is mainly carried out by means of a built-in second piston 22, that is, the air pressure adjustable chamber is shared with the floating chamber in the original pneumatic lifter. Because the traditional pneumatic lifter itself has a floating chamber, and this embodiment just takes advantage of this existing floating chamber and improves it, so that the floating chamber is both an air pressure chamber that provides thrust to the first piston rod 1 and a chamber that can adjust the air pressure by using the second piston 22. Using one chamber to complete two functions is obviously more compact in overall structure, which is very beneficial for some furniture products with relatively cramped internal installation space.

[0032] Regarding the specific structure of the driver, in this embodiment, the driver preferably includes a rotating screw 21, and the end of the gas storage pipe 3 away from the first rod body 12 is provided with a threaded hole 231. Figure 2 For example, a threaded hole 231 is provided at the bottom end of the gas storage pipe 3, the rotating screw 21 is threadedly matched with the threaded hole 231, the end of the rotating screw 21 is connected to the second piston 22, and the rotating screw 21 pushes the second piston 22 when it rotates. When the rotating screw 21 rotates, it will produce axial movement relative to the threaded hole 231, thereby pushing the second piston 22. In this embodiment, the rotating screw 21 is used for driving, so that the control accuracy of the axial stroke of the second piston 22 can be higher.

[0033] It should be noted that, for the design of the threaded hole 231, a nut 23 may be designed separately to be fixed at the bottom end of the gas storage pipe 3, for example Figure 2 As shown in , this design does not need to change the original cylinder structure of the gas storage pipe, and only needs to install an additional nut 23 at the bottom of the cylinder. Of course, the nut and the gas storage pipe 3 can also be designed as one, that is, as long as a threaded hole 231 is set at the bottom of the cylinder of the gas storage pipe 3.

[0034] The connection mode between the second piston 22 and the end of the rotating screw 21 can be a completely connected mode or a mutually abutted mode. In this embodiment, it is preferred that the second piston 22 and the rotating screw 21 are mutually abutted, that is, the second piston 22 and the rotating screw 21 are only in contact, but not completely connected, so that the rotation of the rotating screw 21 is independent and will not drive the second piston 22 to rotate. The second piston 22 only needs to achieve axial movement, which can reduce the wear between the second piston 22 and the inner wall of the gas storage pipe 3. In this embodiment, as a preference, a plane bearing 24 is provided between the second piston 22 and the rotating screw 21. The plane bearing 24 can withstand a large axial load force, and also helps to reduce the wear of the rotating screw 21 on the second piston 22 due to the rotation of the rotating screw 21.

[0035] Generally speaking, the rotating screw 21 and the threaded hole 231 are threadedly matched. In order to reduce resistance, there is usually a certain process gap between the threaded hole 231 and the rotating screw 21, which can easily lead to a certain movement of the rotating screw 21 during rotation. In order to alleviate this situation, the air storage pipe 3 in this embodiment is provided with a guide sleeve 25 on one side of the inner end of the threaded hole 231 for positioning the rotating screw 21. The inner diameter of the guide sleeve 25 can be set to match the outer diameter of the rotating screw 21, thereby reducing the shaking degree of the rotating screw 21.

[0036] In order to enable the first piston rod 1 in this embodiment to be locked at any position, a controllable valve 13 is provided on the first piston 11 in this embodiment, and the controllable valve 13 is used to control the air pressure balance between the two floating chambers. When the controllable valve 13 is opened, the air pressure between the two floating chambers is communicated to achieve air pressure balance. Since the controllable valve 13 has been widely disclosed in current gas spring products, it will not be described in detail in this article.

[0037] In order to make it more convenient for users to adjust the air pressure in the adjustable air pressure chamber, the end of the rotating screw rod 21 in this embodiment extends out of the air storage pipe 3, and the end of the rotating screw rod 21 is connected to a transmission worm gear, which is connected to a drive motor. By controlling the forward or reverse rotation of the drive motor, the forward or reverse rotation of the rotating screw rod 21 can be achieved, thereby controlling the air pressure in the adjustable air pressure chamber.

[0038] It should be noted that the drive motor, rotating screw 21 and other components in this embodiment are only used to adjust the air pressure in the floating chamber. The power of the drive motor does not need to be very high, and only a small-sized motor is needed. In addition, the size and transmission accuracy of the rotating screw 21 do not require very high requirements. Compared with the traditional electric lifting platform, although the names of the components are similar, the roles they play in the scheme are essentially different. In terms of cost, the drive motor and rotating screw 21 in this embodiment will obviously be much lower.

[0039] In addition, it should also be noted that the driving force for rotating the screw rod 21 is not limited to the driving motor, but can also be manually rotated. A hand-cranked mechanism can be connected to the end of the rotating screw rod 21, and manually shaking the rotating mechanism can also achieve the purpose of adjusting the air pressure. This implementation mode also falls within the protection scope of the present invention.

[0040] Embodiment 2:

[0041] like Figure 3As shown in , the difference between this embodiment and the first embodiment is that in the first embodiment, the rotating screw 21 not only rotates itself, but also moves axially relative to the gas storage tube 3, while in the present embodiment, the rotating screw 21 only rotates, and the axial direction does not move relative to the gas storage tube 3, and it is the nut that moves axially. That is, the driver in the present embodiment includes the rotating screw 21, and the second piston 22 is connected with a nut member 26, and the nut member 26 is threadedly matched with the rotating screw 21, and when the rotating screw 21 rotates, the nut member 26 is driven to move axially.

[0042] The structure of the nut member 26 of this embodiment has various forms, and can be similar to the common nut 23 in the first embodiment, directly connected to the second piston 22, or can be other structures, such as Figure 3 In this embodiment, the nut member 26 is preferably a tubular member, which includes a hollow cavity 261. One end of the nut member 26 is provided with a threaded hole 231, and one end of the rotating screw 21 extends into the hollow cavity 261 through the threaded hole 231.

[0043] Embodiment three:

[0044] like Figures 4 to 5 As shown, this embodiment is a pneumatic lifting platform, specifically a single-column pneumatic lifting table, including a lifting column 4, the top of the lifting column 4 is connected to a table top 5, the bottom of the lifting column 4 is connected to a base 6, the lifting column 4 includes a first telescopic sleeve 41, a second telescopic sleeve 42 and a driving lifter, the second telescopic sleeve 42 is sleeved outside the first telescopic sleeve 41, the first telescopic sleeve 41 and the second telescopic sleeve 42 of the driving lifter move axially relative to each other, and the driving lifter adopts a pneumatic lifter as in Example 1 or Example 2 or an equivalent embodiment thereof.

[0045] In this embodiment, it is preferred to use a driving motor 27 to drive the rotating screw 21. At the same time, in order to facilitate user control, the pneumatic lifting platform of this embodiment also includes a hand controller 7, which is preferably installed at the bottom of the table 5, so that the user can realize the forward and reverse rotation of the driving motor by pressing the button on the hand controller 7. In addition, pressing the button also has the possibility of achieving ascent and descent, because if the air pressure in the air pressure adjustable chamber of the pneumatic lifter changes, it will drive the air pressure difference in the two floating chambers to change, and the first piston rod 1 will also be correspondingly achieved. Therefore, in essence, in some embodiments, the button on the hand controller 7 is not only a switch for adjusting the air pressure adjustable chamber, but also a switch for the ascent and descent of the pneumatic lifter.

[0046] In addition, in order to reduce the friction between the first telescopic sleeve 41 and the second telescopic sleeve 42, a slider is provided between the first telescopic sleeve 41 and the second telescopic sleeve 42. In this embodiment, the slider includes a movable slider 43 and a static slider 44. The static slider 44 is installed on the top of the second telescopic sleeve 42 and remains fixed with the second telescopic sleeve 42. The movable slider 43 has multiple pieces, which are circumferentially installed on the outer peripheral side wall of the first telescopic sleeve 41 and rise and fall with the rise and fall of the first telescopic sleeve 41.

[0047] It should be noted that in other embodiments, the pneumatic lifting platform may also be a double-column lifting table, or even a three-column lifting table, etc., which are not exhaustively listed herein.

[0048] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modification that does not deviate from the functional and structural principles of the present invention will be included in the scope of the claims.

Claims

1. A pneumatic lifting platform, comprising a lifting column, wherein a base is provided at the bottom of the lifting column, wherein the lifting column comprises a first telescopic sleeve, a second telescopic sleeve and a driving lifter, wherein the second telescopic sleeve is sleeved outside the first telescopic sleeve, and the driving lifter, the first telescopic sleeve and the second telescopic sleeve move axially relative to each other, characterized in that: The driving lifter adopts a pneumatic lifter, which includes an air storage tube and a first piston rod at least partially located in the air storage tube, the first piston rod includes a first piston and a first rod body, the first rod body at least partially extends out of the air storage tube, the inner cavity of the air storage tube is divided into two floating chambers by the first piston, and the floating chamber away from the first rod body of the two floating chambers is an air pressure adjustable chamber, a second piston is arranged in the air pressure adjustable chamber, the second piston is connected to a driver, the driver includes a rotating screw and a nut threaded with the rotating screw, the rotating screw is connected to a driving motor, and the The second piston moves axially relative to the air storage tube under the action of the driver to change the air pressure in the adjustable air pressure chamber; the second piston is connected to a nut component, and the nut component is threadedly matched with the rotating screw rod, and the rotating screw rod drives the nut component to move axially when it rotates; the nut component includes a hollow cavity, and one end of the nut component is provided with a threaded hole, and one end of the rotating screw rod extends into the hollow cavity through the threaded hole; the first piston is provided with a controllable valve, and the controllable valve is used to control the air pressure balance between the two floating chambers; the pneumatic lifting platform includes a hand controller for connecting and controlling the drive motor.

2. The pneumatic lifting platform according to claim 1, characterized in that: A threaded hole is provided at the end of the gas storage pipe away from the first rod body, the rotating screw is threadedly matched with the threaded hole, the end of the rotating screw is connected to the second piston, and the rotating screw pushes the second piston when rotating.

3. The pneumatic lifting platform according to claim 1, characterized in that: The second piston and the rotating screw rod abut against each other, and a plane bearing is arranged between the second piston and the rotating screw rod.

4. The pneumatic lifting platform according to claim 1, characterized in that: The gas storage pipe is provided with a guide sleeve on one side of the inner end of the threaded hole for positioning the rotating screw rod.

5. The pneumatic lifting platform according to any one of claims 2 to 4, characterized in that: The end of the rotating screw rod extends out of the gas storage pipe and is connected to the driving motor; or the end of the rotating screw rod extends out of the gas storage pipe and is connected to a hand-cranked mechanism, and the hand-cranked mechanism drives the rotating screw rod to rotate.

Images