Three-section type lifting column

Abstract

The utility model discloses a three-section type lifting column which comprises a lifting pipe and a fixing pipe arranged on the lifting pipe in a sleeved mode, the lifting pipe moves relative to the fixing pipe through a lifting driving mechanism, a synchronous lifting pipe is arranged on the lifting pipe in a sleeved mode, and a pin roller retainer is arranged at the lower end of the synchronous lifting pipe. A plurality of pin rollers are arranged on the pin roller retainer and located between the outer wall of the lifting pipe and the interior of the fixed pipe, and the synchronous lifting pipe moves relative to the fixed pipe. According to the scheme, sliding friction between the fixed pipe and the lifting pipe is changed into rolling friction through the pin rollers on the pin roller retainers, abrasion caused by the sliding friction between the sleeves is reduced, abrasion of the sleeves is reduced, and the service life of the sleeves is prolonged; the fixed pipe and the lifting column move stably and are not prone to shaking, and abnormal sound caused by collision between the sleeves is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of lifting columns, in particular to a three-section lifting column. Background Art

[0002] At present, lifting columns are widely used in various products. For example, when used as lifting components of lifting tables, the height of the lifting tables can be flexibly adjusted to meet the needs of various groups of people. Lifting columns generally include electric lifting columns and pneumatic lifting columns. For pneumatic lifting columns, they are generally gas springs with self-locking structures, and the lifting operation generally needs to be performed manually. For electric lifting columns, they are generally composed of motors, screws, screw nuts and sleeves, etc. The motor drives the screw to rotate for lifting and lowering. The entire lifting operation is powered by the motor for automatic lifting. In existing lifting columns, the sleeves generate relative motion through the driving mechanism. The sliding friction between the sleeves causes greater wear on the sleeves, and the sleeves are prone to relative rotation, which makes it easy for the sleeves to shake and make abnormal noises when they move relative to each other.

[0003] For example, Chinese patent publication number CN108903239A, published on November 30, 2018, is named "Lifting Table", which includes: a desktop and a table frame detachably arranged under the desktop, and a lifting leg connected to the inner frame of the table frame and located under the desktop; the lifting leg includes a support base connected to the table frame, a lifting leg assembly connected to the support base at one end and vertically distributed with the desktop, and a support part connected to the other end of the lifting leg assembly and suitable for directly supporting on the ground. The support base includes an outer shell and a driving mechanism accommodated in the inner cavity of the outer shell and suitable for driving the lifting leg assembly to perform lifting motion; the driving mechanism includes a lifting motor, a lifting assembly connected to the lifting motor, and an intelligent control assembly electrically connected to the lifting motor.

[0004] The disadvantages of the existing patents are that the sleeves in the existing lifting columns generate relative movement through the driving mechanism, the sliding friction between the sleeves causes greater wear on the sleeves, and the sleeves are prone to relative rotation, which makes it easy for the sleeves to shake, make abnormal noises, and other problems when they move relative to each other. Utility Model Content

[0005] The utility model aims to solve the problem that the sleeves of the existing lifting columns are greatly worn and easily shake and make abnormal noise during relative movement, and to provide a three-section lifting column which reduces the wear on the sleeves and avoids the shaking and abnormal noise.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A three-stage lifting column comprises a lifting tube and a fixed tube sleeved on the lifting tube, the lifting tube moves relative to the fixed tube through a lifting drive mechanism, a synchronous lifting tube is sleeved on the lifting tube, a roller holder is provided at the lower end of the synchronous lifting tube, a plurality of rollers are provided on the roller holder, the rollers are located between the outer wall of the lifting tube and the inside of the fixed tube, and the synchronous lifting tube moves relative to the fixed tube. The three-stage lifting column described in this scheme converts the sliding friction between the fixed tube and the lifting tube into rolling friction through the rollers on the roller holder, reduces the wear between the sleeves due to sliding friction, reduces the wear of the sleeves and increases the service life of the sleeves. The rollers are in line contact with the outer wall of the lifting tube, and the rollers are in line contact with the outer wall of the fixed tube. When the lifting tube moves, the rollers are driven to move on the inner wall of the fixed tube, so that the fixed tube and the lifting column move smoothly, are not easy to shake, and the sleeves will not collide to cause abnormal noise. The rollers are interference fit between the synchronous lifting tube and the fixed tube, and the bending and torsional rigidity is better.

[0008] Preferably, the central axis of the roller is perpendicular to the moving direction of the synchronous lifting tube. The central axis of the roller is always perpendicular to the moving direction of the synchronous lifting tube, so that when the synchronous lifting tube is lifted or lowered, the roller is driven to rotate, so that the roller is lifted or lowered along the inner wall of the fixed tube.

[0009] Preferably, there are multiple roller cages, and at least two roller cages are arranged on both sides of the lower end of the synchronous lifting tube. At least two roller cages are symmetrically arranged on both sides of the synchronous lifting tube, so that the relative movement between the synchronous lifting tube and the fixed tube is more stable and less likely to shake, thereby preventing the collision between the sleeves and generating abnormal noise.

[0010] Preferably, the roller retainer is provided with a plurality of mounting grooves, and a limiting buckle is provided on the side wall of the mounting groove, and the inner wall of the limiting buckle is an arc surface or a cylindrical surface, and the roller is rolled and clamped in the mounting groove through the limiting buckle. The roller is installed in the mounting groove, and the limiting buckle limits the roller in the mounting groove, and the inner wall of the limiting buckle is an arc surface or a cylindrical surface, so that the inner wall of the limiting buckle cooperates with the roller.

[0011] Preferably, the roller cage is provided with an oil storage tank, which is connected to the mounting slot. Lubricating oil is provided in the oil storage tank. The oil storage tank provides long-term lubrication support for the roller, thereby extending the service life of the roller and reducing the noise generated by the rolling of the roller, so that the lifting column is more silent.

[0012] Preferably, there are multiple oil storage tanks, which are respectively arranged on the outer side and the inner side of the roller cage. There are multiple rollers, which can provide a better support effect. The oil storage tanks are respectively arranged on the inner side and the outer side of the corresponding roller, so that the inner side and the outer side of the roller can better contact the lubricating oil in the oil storage tank.

[0013] Preferably, the upper end of the roller cage is clamped on the lower end of the synchronous lifting tube. The roller cage is clamped on the lower end of the synchronous lifting tube to facilitate installation, disassembly and replacement of the roller cage.

[0014] Preferably, a slot is provided on the side wall of the upper end of the roller cage, a buckle is provided in the slot, a snap plate is provided at the lower end of the synchronous lifting tube, a snap plate is provided on the snap plate, a snap hole is provided on the snap plate, the snap plate cooperates with the slot, and the snap plate is snap-fitted with the buckle through the snap hole. The snap plate at the lower end of the synchronous lifting tube is snap-fitted in the slot of the roller cage, and the snap hole is snap-fitted with the buckle.

[0015] Preferably, the buckle is provided with an inclined surface, which is arranged obliquely upwards. The inclined surface facilitates the buckle to be inserted into the clamping hole, causes less wear on the buckle, and is not easy to damage the buckle.

[0016] Preferably, a limiter is provided at the lower part of the lifting tube, the limiter is located below the roller retainer, and the limiter limits the roller retainer on the lifting tube. The limiter solves the problem of the roller retainer sliding off due to roller wear after long-term use.

[0017] Therefore, the utility model has the following beneficial effects: the rollers on the roller retainer convert the sliding friction between the fixed tube and the lifting tube into rolling friction, thereby reducing the wear between the sleeves due to sliding friction, reducing the wear of the sleeves and increasing the service life of the sleeves; the movement between the fixed tube and the lifting column is smooth and not prone to shaking, and there is no collision between the sleeves to cause abnormal noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the utility model.

[0019] Figure 2 It is an exploded view of the utility model.

[0020] Figure 3 yes Figure 2 A partial enlarged view of point A in the middle.

[0021] As shown in the figure:

[0022] Lifting tube 1, limiter 1.1,

[0023] Fixed pipe 2, driving mechanism 3,

[0024] Synchronous lifting tube 4, snap-on ear plate 4.1, snap-on hole 4.1.1,

[0025] Roller cage 5, mounting groove 5.1, limit buckle 5.2, oil storage groove 5.3, slot 5.4, buckle 5.4.1, inclined surface 5.4.1.1,

[0026] Roller 6, desktop mounting plate 7, upper guide sleeve 8, lower guide sleeve 9. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the technical solution embodiments of the utility model clearer, the utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0028] Embodiment 1, as Figure 1 , Figure 2 , Figure 3 A three-section lifting column shown in the figure comprises a lifting tube 1 and a fixed tube 2 sleeved on the lifting tube 1. The lifting tube 1 moves relative to the fixed tube 2 through a lifting drive mechanism 3. A synchronous lifting tube 4 is sleeved on the lifting tube 1. A roller retainer 5 is provided at the lower end of the synchronous lifting tube 4. A plurality of rollers 6 are provided on the roller retainer 5. The rollers 6 are located between the outer wall of the lifting tube 1 and the interior of the fixed tube 2. The synchronous lifting tube 4 moves relative to the fixed tube 2.

[0029] In the above embodiment, a three-stage lifting column, the sliding friction between the fixed tube 2 and the lifting tube 1 is converted into rolling friction by the roller 6 on the roller retainer 5, thereby reducing the wear between the sleeves due to sliding friction, reducing the wear of the sleeves and increasing the service life of the sleeves. The roller 6 is in line contact with the outer wall of the lifting tube 1, and the roller 6 is in line contact with the outer wall of the fixed tube 2. When the lifting tube 1 moves, the roller 6 is driven to move on the inner wall of the fixed tube 2, so that the movement between the fixed tube 2 and the lifting column is smooth and not easy to shake, and there is no collision between the sleeves to cause abnormal noise. The roller 6 is interference fit between the synchronous lifting tube 4 and the fixed tube 2, and the anti-bending and anti-torsion rigidity is better. It solves the problem that the sleeves in the existing lifting column generate relative movement through the driving mechanism 3, the sliding friction between the sleeves causes greater wear on the sleeves, and the sleeves are prone to relative rotation, which makes it easy for the sleeves to shake and make abnormal noise when they move relative to each other.

[0030] This embodiment has the following beneficial effects: the sliding friction between the fixed tube 2 and the lifting tube 1 is converted into rolling friction by the rollers 6 on the roller retainer 5, thereby reducing the wear between the sleeves due to sliding friction, alleviating the wear of the sleeves and increasing the service life of the sleeves; the movement between the fixed tube 2 and the lifting column is smooth and not prone to shaking, and there is no collision between the sleeves to cause abnormal noise.

[0031] The lifting column in the present application can be used for lifting desks. The fixed tube 2 is fixed on the table leg. The upper end of the lifting tube 1 is fixed to the desktop mounting plate 7. The driving mechanism 3 adopts a gas spring. The lower end of the gas spring is set on the table leg. The upper end of the gas spring is connected to the lifting tube 1 or the desktop mounting plate 7. The upper end of the gas spring is provided with a release switch and a pull wire (the opening of the gas spring is a prior art). The gas spring drives the lifting tube 1 to move relatively along the fixed tube 2. The roller 6 of the roller retainer 5 is interference fit between the fixed tube 2 and the lifting tube 1.

[0032] Embodiment 2, as Figure 1 , Figure 2 , Figure 3 A three-section lifting column shown in the figure comprises a lifting tube 1 and a fixed tube 2 sleeved on the lifting tube 1. The lifting tube 1 moves relative to the fixed tube 2 through a lifting drive mechanism 3. A synchronous lifting tube 4 is sleeved on the lifting tube 1. A roller retainer 5 is provided at the lower end of the synchronous lifting tube 4. A plurality of rollers 6 are provided on the roller retainer 5. The rollers 6 are located between the outer wall of the lifting tube 1 and the inside of the fixed tube 2. The synchronous lifting tube 4 moves relative to the fixed tube 2. The central axis of the rollers 6 is arranged perpendicular to the moving direction of the synchronous lifting tube 4. The central axis of the rollers 6 is always arranged perpendicular to the moving direction of the synchronous lifting tube 4, so that when the synchronous lifting tube 4 is lifted or lowered, the rollers 6 are driven to rotate, so that the rollers 6 are lifted or lowered along the inner wall of the fixed tube 2.

[0033] Specifically, the lifting tube 1, the fixed tube 2 and the synchronous lifting tube 4 are square tubes to prevent the tubes from rotating. The roller retainer 5 makes the tubes resistant to bending and has better torsional rigidity.

[0034] In this embodiment, there are multiple roller cages 5, and at least two roller cages 5 are arranged on both sides of the lower end of the synchronous lifting tube 4. At least two roller cages 5 are symmetrically arranged on both sides of the synchronous lifting tube 4, so that the relative movement between the synchronous lifting tube 4 and the fixed tube 2 is more stable, less likely to shake, and prevent the collision between the sleeves to produce abnormal noise. The number of rollers 6 on any roller cage 5 is multiple, and the rollers 6 are evenly distributed on the roller cage 5, so that any side of the lifting tube 1 is provided with a plurality of rollers 6 supported on the inner wall of the fixed tube 2.

[0035] Specifically, Figure 1 , Figure 2 , Figure 3As shown, the roller retainer 5 is provided with a plurality of mounting grooves 5.1, and a limiting buckle 5.2 is provided on the side wall of the mounting groove 5.1. The inner wall of the limiting buckle 5.2 is an arc surface or a cylindrical surface, and the roller 6 is rolled and clamped in the mounting groove 5.1 through the limiting buckle 5.2. The roller 6 is installed in the mounting groove 5.1, and the limiting buckle 5.2 limits the roller 6 in the mounting groove 5.1. The inner wall of the limiting buckle 5.2 is an arc surface or a cylindrical surface, so that the inner wall of the limiting buckle 5.2 cooperates with the roller 6. The roller retainer 5 is provided with an oil storage groove 5.3, and the oil storage groove 5.3 is connected with the mounting groove 5.1. Lubricating oil is provided in the oil storage groove 5.3. The oil storage groove 5.3 provides long-term lubrication support for the roller 6, so that the roller 6 has a longer service life, and reduces the sound generated by the rolling of the roller 6, so that the lifting column is more silent.

[0036] The oil storage tank 5.3 is further optimized, such as Figure 3 As shown, there are multiple oil storage grooves 5.3, which are respectively arranged on the outer side and the inner side of the roller cage 5. There are multiple rollers 6, which provide a better support effect. The oil storage grooves 5.3 are respectively arranged on the inner side and the outer side of the corresponding roller 6, so that the inner side and the outer side of the roller 6 can better contact the lubricating oil in the oil storage groove 5.3.

[0037] Specifically, the roller cage 5 is formed by integral injection molding, which has a simple structure, low cost and convenient installation.

[0038] In this embodiment, Figure 2 , Figure 3 As shown, the upper end of the roller retainer 5 is clamped on the lower end of the synchronous lifting tube 4. The roller retainer 5 is clamped on the lower end of the synchronous lifting tube 4, which is convenient for the installation, disassembly and replacement of the roller retainer 5. A clamping groove 5.4 is provided on the upper side wall of the roller retainer 5, and a buckle 5.4.1 is provided in the clamping groove 5.4. The lower end of the synchronous lifting tube 4 is provided with a clamping ear plate 4.1, and a clamping hole 4.1.1 is provided on the clamping ear plate 4.1. The clamping ear plate 4.1 cooperates with the clamping groove 5.4, and the clamping ear plate 4.1 is clamped and matched with the buckle 5.4.1 through the clamping hole 4.1.1. The clamping ear plate 4.1 at the lower end of the synchronous lifting tube 4 is clamped in the clamping groove 5.4 of the roller retainer 5, and the clamping hole 4.1.1 is clamped and matched with the buckle 5.4.1.

[0039] Further optimize the snap 5.4.1, such as Figure 2 , Figure 3 As shown, the buckle 5.4.1 is provided with an inclined surface 5.4.1.1, which is arranged obliquely upward. The inclined surface 5.4.1.1 facilitates the buckle 5.4.1 to be inserted into the clamping hole 4.1.1, and the buckle 5.4.1 is less worn and not easily damaged.

[0040] Further, such as Figure 2As shown, a stopper 1.1 is provided at the lower part of the lifting tube 1, and the stopper 1.1 is located below the roller retainer 5, and the stopper 1.1 stops the roller retainer 5 on the lifting tube 1. The stopper 1.1 solves the problem that the roller retainer 5 slides due to the wear of the roller 6 after long-term use. The stopper 1.1 can be a stopper screw, and the stopper screw is locked at the lower end of the lifting tube 1.

[0041] Furthermore, an upper guide sleeve 8 is provided at the upper end of the synchronous lifting tube 4, and the upper guide sleeve 8 is clamped at the upper end port of the synchronous lifting tube 4. The lifting tube 1 passes through the upper guide sleeve 8 and extends into the synchronous lifting tube 4. A lower guide sleeve 9 is provided at the upper end of the fixed tube 2, and the lower guide sleeve 9 is clamped at the upper end port of the fixed tube 2. The synchronous lifting tube 4 and the lifting tube 1 extend into the lower guide sleeve 9 through the lower guide sleeve 9. The upper guide sleeve 8 and the lower guide sleeve 9 prevent external dust and debris from entering the pipe fitting, and have a guiding effect while preventing dust, and also have an aesthetic effect.

[0042] like Figure 1 , Figure 2 , Figure 3 As shown, a three-stage lifting column in the above embodiment, through the roller 6 on the roller retainer 5, the sliding friction between the fixed tube 2 and the lifting tube 1 is converted into rolling friction, thereby reducing the wear between the sleeves due to sliding friction, reducing the wear of the sleeves and increasing the service life of the sleeves. The roller 6 is in line contact with the outer wall of the lifting tube 1, and the roller 6 is in line contact with the outer wall of the fixed tube 2. When the lifting tube 1 moves, the roller 6 drives the roller 6 to move on the inner wall of the fixed tube 2, so that the movement between the fixed tube 2 and the lifting column is smooth, and it is not easy to shake, and there will be no collision between the sleeves to cause abnormal noise. The roller 6 is interference fit between the synchronous lifting tube 4 and the fixed tube 2, and the anti-bending and anti-torsion rigidity is better. It solves the problem that the sleeves in the existing lifting column generate relative movement through the driving mechanism 3, the sliding friction between the sleeves causes greater wear on the sleeves, and the sleeves are prone to relative rotation, which makes it easy for the sleeves to shake and make abnormal noise when they move relative to each other.

[0043] This embodiment has the following beneficial effects: the sliding friction between the fixed tube 2 and the lifting tube 1 is converted into rolling friction by the rollers 6 on the roller retainer 5, thereby reducing the wear between the sleeves due to sliding friction, alleviating the wear of the sleeves and increasing the service life of the sleeves; the movement between the fixed tube 2 and the lifting column is smooth and not prone to shaking, and there is no collision between the sleeves to cause abnormal noise.

[0044] Lifting columns are widely used in various products. For example, when used as lifting components of lifting tables, the height of the lifting tables can be flexibly adjusted to meet the needs of various groups of people. Lifting columns generally include electric lifting columns and pneumatic lifting columns. For pneumatic lifting columns, they are generally gas springs with self-locking structures, and the lifting operation generally needs to be performed manually. For electric lifting columns, they are generally composed of motors, screw rods, screw nuts and sleeves, etc. The motor drives the screw rod to rotate for lifting and lowering. The entire lifting operation is powered by the motor for automatic lifting. The lifting column in this application can be used for lifting desks. The fixed tube 2 is fixed on the table foot, and the upper end of the lifting tube 1 is fixed to the desktop mounting plate 7. The driving mechanism 3 adopts a gas spring, the lower end of the gas spring is set on the table foot, and the upper end of the gas spring is connected to the lifting tube 1 or the desktop mounting plate 7. The upper end of the gas spring is provided with a release switch and a pull wire (the opening of the gas spring is a prior art). The gas spring drives the lifting tube 1 to move relatively along the fixed tube 2, and the roller 6 of the roller retainer 5 is interference fit between the fixed tube 2 and the lifting tube 1.

[0045] The specific embodiments described above are only preferred implementations of the present invention, and are not intended to limit the specific implementation scope of the present invention. All equivalent changes made in accordance with the shape and structure of the present invention should be included in the protection scope of the present invention.

Claims

1. A three-stage lifting column, comprising a lifting tube and a fixed tube sleeved on the lifting tube, wherein the lifting tube moves relative to the fixed tube through a lifting drive mechanism, characterized in that: A synchronous lifting tube is sleeved on the lifting tube, a roller retainer is provided at the lower end of the synchronous lifting tube, a plurality of rollers are provided on the roller retainer, the rollers are located between the outer wall of the lifting tube and the interior of the fixed tube, and the synchronous lifting tube moves relative to the fixed tube; a plurality of mounting grooves are provided on the roller retainer, the rollers are installed in the mounting grooves, an oil storage groove is provided on the roller retainer, and the oil storage groove is connected with the mounting groove.

2. A three-stage lifting column according to claim 1, characterized in that: The central axis of the roller is arranged perpendicular to the moving direction of the synchronous lifting tube.

3. A three-stage lifting column according to claim 2, characterized in that: There are multiple roller retainers, and at least two roller retainers are arranged on both sides of the lower end of the synchronous lifting tube.

4. A three-stage lifting column according to claim 1, 2 or 3, characterized in that: A limiting buckle is provided on the side wall of the installation groove, the inner wall of the limiting buckle is an arc surface or a cylindrical surface, and the roller is rollingly clamped in the installation groove through the limiting buckle.

5. The three-stage lifting column according to claim 1, characterized in that: There are a plurality of oil storage grooves, and the oil storage grooves are respectively arranged on the outer side and the inner side of the roller cage.

6. A three-section lifting column according to claim 1, 2 or 3, characterized in that: The upper end of the roller retainer is clamped on the lower end of the synchronous lifting tube.

7. A three-stage lifting column according to claim 6, characterized in that: A slot is provided on the upper side wall of the roller retainer, a buckle is provided in the slot, a snap-on is provided at the lower end of the synchronous lifting tube, a snap-on ear plate is provided, a snap-on hole is provided on the snap-on ear plate, the snap-on ear plate cooperates with the slot, and the snap-on ear plate is snap-on-coordinated with the buckle through the snap-on hole.

8. A three-stage lifting column according to claim 7, characterized in that: The buckle is provided with an inclined surface, and the inclined surface is arranged obliquely upward.

9. A three-stage lifting column according to claim 1, 2 or 3, characterized in that: A limiting member is provided at the lower part of the lifting tube. The limiting member is located below the roller retainer. The limiting member limits the roller retainer on the lifting tube.

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