A lifting mechanism

Abstract

A lifting mechanism comprises: a sleeve, an upper screw and a lower screw; a driving mechanism for driving the upper screw to rotate is installed at the top of the upper screw; the sleeve is through from top to bottom, the bottom end of the upper screw extends from the top of the sleeve and is threadedly connected with the upper end of the sleeve; the lower screw extends from the bottom of the sleeve and is threadedly connected with the lower end of the sleeve; the lower screw is hollow, and the upper screw can extend into the lower screw; a first clamping structure is provided near the top of the sleeve; a second clamping structure that can cooperate with the first clamping structure is provided at the bottom of the upper screw; when the second clamping structure rotates and rises to the top of the sleeve as the upper screw rotates, it cooperates with the first clamping structure, and the sleeve rotates with the upper screw; when the sleeve rotates around the lower screw and descends until the top of the lower screw abuts against the first clamping structure, the first clamping structure is separated from the second clamping structure, and the upper screw rotates and descends and continues to penetrate into the lower screw. The lifting mechanism has a simple adjustment process, a large lifting range, and a high safety factor.

Description

Technical Field

[0001] The present disclosure generally relates to the technical field of lifting equipment, and more particularly to a lifting mechanism. Background Art

[0002] At present, lifting mechanisms are widely used in various products, such as lifting desks and chairs, lifting equipment, liftable furniture and so on.

[0003] However, in the prior art, the lifting mechanism is usually composed of two parts: an upper support with a positioning hole and a lower support with a fixing hole, and a single wire shaft and a matching fixed nut on the other hand. The lifting range is small; its connection method is mostly bolt or slide installation and fixing, and the adjustment process is relatively complicated. Summary of the invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide a lifting mechanism with three-stage mechanical lifting and a simple adjustment process, good safety performance, and a larger lifting range.

[0005] In order to solve the above technical problems, the first aspect of the present application provides a lifting mechanism, comprising: a sleeve, an upper screw rod and a lower screw rod; a driving mechanism for driving the upper screw rod to rotate is installed at the top of the upper screw rod; the sleeve is through-through from top to bottom, the top of the upper screw rod extends from the top of the sleeve and is threadedly connected to the upper end of the sleeve; the lower screw rod extends from the bottom of the sleeve and is threadedly connected to the lower end of the sleeve; the lower screw rod is hollow, and the upper screw rod can extend into the lower screw rod;

[0006] A first clamping structure is provided in the sleeve near the top; the bottom end of the upper screw rod is connected to a second clamping structure that can cooperate with the first clamping structure;

[0007] When the second clamping structure rises to the first clamping structure as the upper screw rod rotates, the second clamping structure cooperates with the first clamping structure, so that the sleeve rotates together with the upper screw rod;

[0008] When the sleeve rotates around the lower screw rod and descends to the top of the lower screw rod and abuts against the first clamping structure, the first clamping structure is separated from the second clamping structure, so that the upper screw rod rotates and descends and continues to penetrate into the lower screw rod.

[0009] According to the technical solution provided in the embodiment of the present application, the first clamping structure includes: an engaging inner sleeve, an engaging outer sleeve, a return spring, and a clamping spring;

[0010] The meshing outer sleeve is fixed inside the sleeve; a retaining spring is installed near the bottom of the meshing outer sleeve; the meshing inner sleeve is sleeved inside the meshing outer sleeve; the meshing inner sleeve has an upper structure and a lower structure, the upper part of the meshing inner sleeve is meshed and connected with the meshing outer sleeve, and the lower part of the meshing inner sleeve can pass through the retaining spring, so that the retaining spring abuts against the upper part of the meshing inner sleeve;

[0011] The return spring is sleeved outside the upper screw rod and is located between the engagement inner sleeve and the upper end of the sleeve, and the diameter of the return spring is larger than the outer diameter of the engagement inner sleeve;

[0012] The outer diameter of the lower screw rod is larger than the inner diameter of the lower portion of the meshing inner sleeve, and the inner diameter of the lower screw rod is smaller than the outer diameter of the lower portion of the meshing outer sleeve.

[0013] According to the technical solution provided in the embodiment of the present application, an upper threaded sleeve is sleeved and fixed inside the upper port of the sleeve, and the upper threaded rod is threadedly connected to the upper threaded sleeve.

[0014] According to the technical solution provided in the embodiment of the present application, a lower threaded sleeve is sleeved and fixed inside the lower port of the sleeve, and the lower screw rod is threadedly connected to the lower threaded sleeve.

[0015] According to the technical solution provided in the embodiment of the present application, the driving mechanism is a crank or a stepping motor.

[0016] According to the technical solution provided in the embodiment of the present application, a fixing bracket is installed at the lower end of the lower screw rod.

[0017] The lifting mechanism provided by the present application comprises: a lifting mechanism of three sections: a sleeve, an upper screw rod and a lower screw rod, wherein the upper screw rod is connected to the upper end of the sleeve by a thread, and the lower screw rod is connected to the lower end of the sleeve by a thread; a first clamping structure is provided near the top of the sleeve; a second clamping structure that can cooperate with the first clamping structure is provided at the bottom end of the upper screw rod, so that the upper screw rod and the sleeve can be combined and separated, that is, the upper screw rod can drive the sleeve to rotate together to realize the lower screw rod extending into or out of the sleeve, and can also rotate alone to realize the upper screw rod extending into or out of the sleeve; specifically:

[0018] During the ascending process, the upper screw is rotated to make it rotate and ascend around the sleeve inside the lower screw. When the second clamping structure rises to the first clamping structure along with the rotation of the upper screw, it cooperates with the first clamping structure to make the sleeve rotate and ascend around the lower screw together with the upper screw.

[0019] During the descent process, when the sleeve is rotated and descended with the lower screw rod until the top end of the lower screw rod abuts against the first clamping structure, the second clamping structure is separated from the first clamping structure, so that the upper screw rod rotates and descends and continues to penetrate into the lower screw rod;

[0020] Thereby, the adjustable height reaches the sum of the lengths of the two lifting mechanisms (upper screw and lower screw), that is, a large lifting space is achieved, and the scope of application is wider and broader; at the same time, the lifting and lowering of the entire lifting mechanism can be achieved only by driving the rotation of the upper screw, and the adjustment process is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0022] Figure 1 This is a three-dimensional assembly diagram of a lifting mechanism of the present application;

[0023] Figure 2 for Figure 1 A schematic cross-sectional view of the meshing inner sleeve and the meshing outer sleeve shown;

[0024] Figure 3 for Figure 1 A partial enlarged schematic diagram of the structure of part A is shown;

[0025] Figure 4 for Figure 1 A partial enlarged schematic diagram of the structure of part B is shown;

[0026] Figure 5 for Figure 1 A partial enlarged schematic diagram of the structure of part C is shown;

[0027] Figure 6 for Figure 1 A front view of the lifting mechanism shown;

[0028] Figure 7 for Figure 1 The cross-sectional structural diagram of the lifting mechanism shown;

[0029] Figure 8 for Figure 7 A partial enlarged schematic diagram of the structure of part D is shown;

[0030] Numbers in the figure:

[0031] 1. Driving mechanism; 2. Upper screw rod; 3. Upper screw sleeve; 4. Return spring; 5. Engagement outer sleeve; 6. Engagement inner sleeve; 7. Second clamping structure; 8. Casing; 9. Lower screw sleeve; 10. Lower screw rod; 11. Fixed bracket; 12. First clamping structure; 13. Circlip DETAILED DESCRIPTION

[0032] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0033] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0034] Example 1

[0035] See also Figures 1 to 8 A schematic diagram of a lifting mechanism provided in this embodiment, comprising a sleeve 8, an upper screw rod 2 and a lower screw rod 10; a driving mechanism 1 for driving the upper screw rod 2 to rotate is installed at the top of the upper screw rod 2; the sleeve 8 is passed through from top to bottom, the top of the upper screw rod 2 extends from the top of the sleeve 8, and is connected with the upper end thread of the sleeve 8 by its own thread; the lower screw rod 10 extends from the bottom of the sleeve 8, and is connected with the lower end thread of the sleeve 8 by its own thread; the lower screw rod 10 is hollow, and the upper screw rod 2 can extend into the lower screw rod 10;

[0036] A first clamping structure 12 is provided near the top of the sleeve 8; a second clamping structure 7 which can cooperate with the first clamping structure is connected to the bottom end of the upper screw rod 2;

[0037] When the second clamping structure 7 rises to the first clamping structure 12 as the upper screw rod 2 rotates, the second clamping structure 7 cooperates with the first clamping structure 12, so that the sleeve 8 rotates together with the upper screw rod 2;

[0038] When the sleeve 8 rotates around the lower screw rod 2 and descends to the top of the lower screw rod 10 and abuts against the first clamping structure 12, the first clamping structure 12 is separated from the second clamping structure 7, so that the upper screw rod 2 rotates and descends and continues to penetrate into the lower screw rod 10.

[0039] During the ascending process, the upper screw rod 2 is rotated to make it rotate and ascend around the sleeve 8 inside the lower screw rod. When the second clamping structure 7 rotates and ascends to the first clamping structure 12 along with the upper screw rod 2, it cooperates with the first clamping structure 12 to make the sleeve 8 rotate around the lower screw rod along with the upper screw rod 2.

[0040] During the descent process, when the sleeve 8 rotates and descends around the lower screw rod 10 until the top end of the lower screw rod 10 abuts against the first clamping structure 12, the second clamping structure 7 separates from the first clamping structure 12, so that the upper screw rod 2 rotates and descends and continues to extend into the lower screw rod 10.

[0041] With the above structure, the three-section mechanical lifting is used, the adjustment process is simple, the safety factor is high, and the three-section mechanical lifting mechanism also makes the lifting range larger.

[0042] Among them, in the preferred embodiment of the first clamping structure, the first clamping structure 12 includes: an engaging inner sleeve 6, an engaging outer sleeve 5, a return spring 4, and a clamping spring 13;

[0043] The meshing outer sleeve 5 is fixed inside the sleeve 8; a retaining spring 13 is installed near the bottom of the meshing outer sleeve 5; the meshing inner sleeve 6 is sleeved inside the meshing outer sleeve 5; the meshing inner sleeve 6 has an upper structure and a lower structure, the upper part of the meshing inner sleeve 6 is meshed and connected with the meshing outer sleeve 5, and the lower part of the meshing inner sleeve 6 can pass through the retaining spring 13, so that the retaining spring 13 abuts against the upper part of the meshing inner sleeve 6;

[0044] A slot is provided near the bottom of the engagement sleeve 5 so that the retaining spring 13 can be installed in the slot. The engagement sleeve 5 can be installed inside the sleeve 8 by casting, welding or the like.

[0045] The meshing inner sleeve 6 has a polygonal inner wall; the second clamping structure 7 has a corresponding polygonal outer wall; for example, the second clamping structure 7 can be a hexagonal nut, and the meshing inner sleeve 6 has a hexagonal inner wall matching the second clamping structure 7; the second clamping structure 7 can also be a triangular nut, a square nut or other special-shaped structure, and the meshing inner sleeve 6 has a polygonal inner wall matching the second clamping structure 7; the length of the second clamping structure 7 is less than the length of the lower part of the meshing inner sleeve 6;

[0046] The return spring 4 is sleeved outside the upper screw rod 2 and is located between the meshing inner sleeve 6 and the upper end of the sleeve 8. The diameter of the return spring 4 is larger than the outer diameter of the meshing inner sleeve 6.

[0047] The outer diameter of the lower screw rod 2 is larger than the inner diameter of the lower part of the engaging inner sleeve 6, and the inner diameter of the lower screw rod 2 is smaller than the outer diameter of the lower part of the engaging outer sleeve 5; when the top end of the lower screw rod 10 abuts against the bottom of the engaging inner sleeve 6, it can drive the engaging inner sleeve 6 to compress the return spring and rise, thereby separating the engaging inner sleeve 6 from the second clamping structure 7.

[0048] During the ascending process, the upper screw rod 2 is rotated to make it rotate and ascend around the sleeve 8 inside the lower screw rod. When the second clamping structure 7 rotates and ascends to the meshing inner sleeve 6 along with the upper screw rod 2, the upper part of the meshing inner sleeve 6 is engaged with the second clamping structure 7. At the same time, since the upper part of the meshing inner sleeve 6 is engaged with the meshing outer sleeve 5, the upper screw rod 2 is continued to be rotated, so that the sleeve 8 rotates and ascends around the lower screw rod along with the upper screw rod 2.

[0049] During the descending process, the sleeve 8 rotates around the lower screw rod 10 and descends until the top end of the lower screw rod abuts against the lower part of the engaging inner sleeve 6. The top end of the lower screw rod 10 drives the engaging inner sleeve 6 to rise and compresses the return spring 4 at the same time. Since the length of the second clamping structure 7 is smaller than the length of the lower part of the engaging inner sleeve 6, when the top end of the lower screw rod 10 drives the engaging inner sleeve 6 to rise to the bottom end of the engaging outer sleeve, the second clamping structure 7 is separated from the engaging inner sleeve 6, so that the upper screw rod can continue to rotate and descend and extend into the lower screw rod.

[0050] At the same time, the first clamping structure 12 is not removable, and the use of all-steel parts with a wall thickness of 1mm-1.7mm increases the wear resistance and service life of the product. The second clamping structure 7 and the meshing inner sleeve 6 are constantly mechanically matched and separated, and the consistency of their movement trajectory is improved through packaging.

[0051] In a preferred embodiment of the sleeve 8 , an upper thread sleeve 3 is sleeved and fixed inside the upper end of the sleeve 8 , and the upper threaded rod 2 is threadedly connected to the upper thread sleeve 3 .

[0052] The upper thread sleeve 3 can be fixed to the upper end of the sleeve 8 by welding; the structure is made more complete by sleeve-fixing the upper thread sleeve 3 in the upper end of the sleeve 8, which reduces the processing difficulty of the sleeve 8; the upper thread sleeve 3 is provided with an internal thread and is threadedly connected with the upper screw rod 2, and the upper screw rod 2 can be rotated and lifted inside the sleeve 8 by the upper thread sleeve 3.

[0053] In a preferred embodiment of the sleeve 8 , a lower threaded sleeve 9 is sleeved and fixed inside the lower end of the sleeve 8 ; and the lower screw rod 10 is threadedly connected to the lower threaded sleeve 9 .

[0054] The lower thread sleeve 9 can be fixed to the lower end of the sleeve 9 by welding; the lower thread sleeve 9 is fixed by sleeve-fitting it into the lower end of the sleeve 8 to make the structure more complete and reduce the processing difficulty of the sleeve 8; the lower thread sleeve 9 is provided with an internal thread and is threadedly connected with the lower screw rod 10, so that the sleeve 8 can be rotated and lifted around the lower screw rod 10.

[0055] In a preferred embodiment of the driving mechanism 1, the driving mechanism 1 is a crank or a stepping motor.

[0056] The crank or stepper motor can be used to control the rotation and lifting of the upper screw 2; the crank includes a rocker and a crank handle, one end of the rocker is fixedly connected to the crank handle, and the other end of the rocker is provided with a driving groove, and the driving groove can be inserted into the top end of the upper screw 2, and the rotation and lifting of the upper screw can be achieved by rotating the crank handle forward and reversely.

[0057] Among them, in the preferred embodiment of the lower screw rod 10, a fixing bracket 11 is installed at the lower end of the lower screw rod. The fixing bracket 11 can be installed at the lower end of the sleeve 10 by threaded connection, which plays a role in fixing the lifting mechanism of the embodiment of the present application.

[0058] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. A lifting mechanism, characterized in that: include: A sleeve (8), an upper screw rod (2) and a lower screw rod (10); a driving mechanism (1) for driving the upper screw rod (2) to rotate is installed at the top of the upper screw rod (2); the sleeve (8) is connected from top to bottom, the top of the upper screw rod (2) extends from the top of the sleeve (8) and is threadedly connected to the upper end of the sleeve (8); the lower screw rod (10) extends from the bottom of the sleeve (8) and is threadedly connected to the lower end of the sleeve (8); the lower screw rod (10) is hollow, and the upper screw rod (2) can extend into the lower screw rod (10); A first clamping structure (12) is provided in the sleeve (8) near the top; the bottom end of the upper screw rod (2) is connected to a second clamping structure (7) that can cooperate with the first clamping structure; When the second clamping structure (7) rises to the first clamping structure (12) as the upper screw rod (2) rotates, it cooperates with the first clamping structure (12) so that the sleeve (8) rotates together with the upper screw rod (2); When the sleeve (8) rotates and descends around the lower screw rod (10) until the top of the lower screw rod (10) abuts against the first clamping structure (12), the first clamping structure (12) separates from the second clamping structure (7), so that the upper screw rod (2) rotates and descends and continues to penetrate into the lower screw rod (10); An upper threaded sleeve (3) is sleeved and fixed inside the upper end of the sleeve (8), and a lower threaded sleeve (9) is sleeved and fixed inside the lower end of the sleeve (8).

2. The lifting mechanism according to claim 1, characterized in that: The first clamping structure comprises: an engaging inner sleeve (6), an engaging outer sleeve (5), a return spring (4), and a clamping spring (13); The meshing outer sleeve (5) is fixed inside the sleeve (8); a retaining spring (13) is installed near the bottom of the meshing outer sleeve (5); the meshing inner sleeve (6) is sleeved inside the meshing outer sleeve (5); the meshing inner sleeve (6) has an upper structure and a lower structure, the upper part of the meshing inner sleeve (6) is meshed and connected with the meshing outer sleeve (5), and the lower part of the meshing inner sleeve (6) can pass through the retaining spring (13), so that the retaining spring (13) abuts against the upper part of the meshing inner sleeve (6); The meshing inner sleeve (6) has a polygonal inner wall; the second clamping structure (7) has a corresponding polygonal outer wall, and the length of the second clamping structure (7) is less than the length of the lower part of the meshing inner sleeve (6); The return spring (4) is sleeved outside the upper screw rod (2) and is located between the meshing inner sleeve (6) and the upper end of the sleeve (8); the diameter of the return spring (4) is larger than the outer diameter of the meshing inner sleeve (6); The outer diameter of the lower screw rod (10) is greater than the inner diameter of the lower portion of the meshing inner sleeve (6), and the inner diameter of the lower screw rod (10) is smaller than the outer diameter of the lower portion of the meshing outer sleeve (5).

3. The lifting mechanism according to any one of claims 1 to 2, characterized in that: The upper screw rod (2) is threadedly connected to the upper screw sleeve (3).

4. The lifting mechanism according to any one of claims 1 to 2, characterized in that: The lower screw rod (10) is threadedly connected to the lower screw sleeve (9).

5. The lifting mechanism according to any one of claims 1 to 2, characterized in that: The driving mechanism (1) is a crank or a stepping motor.

6. The lifting mechanism according to any one of claims 1 to 2, characterized in that: A fixing bracket (11) is installed at the lower end of the lower screw rod.

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