Multi-section screw jack

Abstract

The utility model belongs to the technical field of jack manufacturing, and discloses a multi-section screw jack which comprises a base, a driven gear, a driving gear and a jacking structure. The driven gear is rotatably arranged on the base and meshed with the driving gear. The jacking structure comprises a first rod, a second rod, a sleeve assembly and a special-shaped nut, the first rod is connected to the driven gear and can synchronously rotate along with the driven gear, and the first rod is sleeved with the special-shaped nut. When the first rod synchronously rotates along with the driven gear, due to the fact that the fixing key is arranged between the sleeve assembly and the special-shaped nut in a penetrating mode, rotation of the special-shaped nut is limited, the special-shaped nut ascends and descends in the vertical direction under threaded fit of the first rod and the special-shaped nut, and meanwhile the guide groove slides in the guide part in the vertical direction; the second rod and the sleeve assembly are jacked in the vertical direction, the purpose of rapid lifting is achieved, the lifting efficiency is high, and the working efficiency can be improved easily.

Description

Technical Field

[0001] The utility model relates to the technical field of jack manufacturing, in particular to a multi-section screw jack. Background Art

[0002] The screw jack realizes the effect of screw mechanical lifting through the meshing transmission of large and small gears. The large gear is installed on the chassis of the jack, and the size of the chassis is large, so that the center of gravity of the jack is low and it is not easy to tip over. At the same time, the transmission effect is also good, so it is widely used in various lifting fields.

[0003] However, the screw jack disclosed in the prior art has the defect of limited lifting stroke. In addition, its lifting process is slow, it cannot quickly lift heavy objects, the lifting efficiency is low, and it is easy to affect the operation efficiency. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a multi-section screw jack with a large lifting stroke, which can quickly realize lifting and improve the lifting efficiency.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] Provide a multi-section screw jack, including:

[0007] Base;

[0008] Driven gear, rotatably arranged on the base;

[0009] Driving gear, the driving gear meshes with the driven gear;

[0010] Lifting structure, including a first rod, a second rod, a sleeve assembly and a special-shaped nut. The first rod is connected to the driven gear and can rotate synchronously with the driven gear; the special-shaped nut is sleeved on the first rod and is in threaded cooperation with the first rod; the second rod is sleeved on the first rod, and the lower end surface of the second rod abuts against the upper end surface of the special-shaped nut; a guiding groove extending vertically is arranged on one of the first rod and the second rod, and a guiding part is arranged on the other, and the guiding part is slidably arranged in the guiding groove; the sleeve assembly is sleeved on the second rod, and a fixing key extending in the horizontal direction is arranged through the sleeve assembly and the special-shaped nut.

[0011] As an optional scheme of the multi-section screw jack, the lifting structure further includes a first limiting member;

[0012] An annular groove is arranged on the special-shaped nut, a through hole penetrating in the horizontal direction is arranged on the second rod, and a limiting cavity is enclosed by the annular groove and the through hole, and the first limiting member is arranged through the limiting cavity.

[0013] As an alternative to the multi - section screw jack, the sleeve assembly includes a first sleeve and a second sleeve;

[0014] The first sleeve is sleeved on the second rod and is in threaded cooperation with the outer side of the second rod; a supporting table is provided on the upper end surface of the first sleeve, and the lower end surface of the first sleeve abuts against the upper end surface of the second rod; the second sleeve is sleeved on the first sleeve, a first strip - shaped groove is provided on one of the first sleeve and the second sleeve, and a first protrusion is provided on the other, and the first protrusion is slidably clamped in the first strip - shaped groove;

[0015] A first hole is provided on the second sleeve, a fixing groove is provided on the special - shaped nut, and the fixing key passes through the first hole and the fixing groove.

[0016] As an alternative to the multi - section screw jack, a second limiting member is provided on the outer peripheral wall of the second rod.

[0017] As an alternative to the multi - section screw jack, a clamping groove is annularly provided on the outer wall of the first sleeve, a clamping member is provided on the supporting table, and the clamping member is clamped in the clamping groove.

[0018] As an alternative to the multi - section screw jack, the multi - section screw jack further includes a housing structure, and the housing structure is sleeved on the outside of the jacking structure and is fixed on the base.

[0019] As an alternative to the multi - section screw jack, the housing structure includes a first shell and a second shell, the first shell covers the base, a circular flanging is provided on the second shell, and the second shell is clamped on the first shell through the circular flanging.

[0020] As an alternative to the multi - section screw jack, a plurality of fixing keys are circumferentially and spacedly arranged along the special - shaped nut.

[0021] As an alternative to the multi - section screw jack, a bearing is provided between the base and the driven gear, the first rod is connected to the driven gear, and the bearing is rotatably arranged on the base.

[0022] As an alternative to the multi - section screw jack, an operating rod is connected to the side of the driving gear away from the driven gear.

[0023] Advantages of the present utility model:

[0024] The present invention provides a multi-section screw jack, which includes a base, a driven gear, a driving gear and a jacking structure. The driven gear is rotatably arranged on the base and meshes with the driving gear. The jacking structure includes a first rod, a second rod, a sleeve assembly and a special-shaped nut. The first rod is connected to the driven gear and can rotate synchronously with the driven gear. The special-shaped nut is sleeved on the first rod. When the first rod rotates synchronously with the driven gear, since a fixing key is arranged between the sleeve assembly and the special-shaped nut, the rotation of the special-shaped nut is restricted. Under the screw thread fit between the first rod and the special-shaped nut, the special-shaped nut moves up and down in the vertical direction. At the same time, the guiding groove slides in the guiding part in the vertical direction, so as to realize the jacking of the second rod and the sleeve assembly in the vertical direction, achieving the purpose of rapid lifting, having a high lifting efficiency and being beneficial to improving the operation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a sectional view of the multi-stage screw jack provided by the embodiment of the specific implementation manner of the present utility model;

[0026] Figure 2 is a sectional view of the special-shaped nut provided by the embodiment of the specific implementation manner of the present utility model;

[0027] Figure 3 is a front view of the first rod provided by the embodiment of the specific implementation manner of the present utility model;

[0028] Figure 4 is a top view of the first rod provided by the embodiment of the specific implementation manner of the present utility model;

[0029] Figure 5 is a sectional view of the second rod provided by the embodiment of the specific implementation manner of the present utility model;

[0030] Figure 6 is Figure 5 the A-A sectional view in;

[0031] Figure 7 is a sectional view of the first sleeve provided by the embodiment of the specific implementation manner of the present utility model;

[0032] Figure 8 is Figure 7 the B-B sectional view in;

[0033] Figure 9 is a sectional view of the second sleeve provided by the embodiment of the specific implementation manner of the present utility model;

[0034] Figure 10 is Figure 9 the C-C sectional view in.

[0035] In the figure:

[0036] 1. Base; 11. Bearing;

[0037] 2. Driven gear

[0038] 3. Driving gear; 31. Operating rod

[0039] 4. Lifting structure

[0040] 41. First rod; 411. Guide groove; 412. Clamping part

[0041] 42. Second rod; 421. Guide part; 422. Through hole; 423. Second limiting part

[0042] 43. Sleeve assembly

[0043] 431. First sleeve; 4311. First strip-shaped groove; 4312. Card slot

[0044] 432. Second sleeve; 4321. First protrusion; 4322. First hole; 4323. Second strip-shaped groove

[0045] 44. Special-shaped nut; 441. Annular groove; 442. Fixed groove

[0046] 45. Fixed key; 46. First limiting part

[0047] 5. Supporting table

[0048] 6. Housing structure; 61. First shell; 62. Second shell; 63. Second protrusion Detailed implementation mode

[0049] The following further elaborates on the present utility model in conjunction with the attached drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. Additionally, it should be noted that for the convenience of description, only the parts related to the present utility model rather than all the structures are shown in the attached drawings.

[0050] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0051] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.

[0052] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0053] The technical solution of the present utility model will be further described below in conjunction with the drawings and through specific embodiments.

[0054] As Figures 1 to 10 shown, this embodiment provides a multi-stage screw jack, which includes a base 1, a driven gear 2, a driving gear 3 and a jacking structure 4. Among them, the driven gear 2 is rotatably arranged on the base 1, and the driving gear 3 meshes with the driven gear 2. The jacking structure 4 includes a first rod 41, a second rod 42, a sleeve assembly 43 and a special-shaped nut 44. The first rod 41 is connected to the driven gear 2 and can rotate synchronously with the driven gear 2. The special-shaped nut 44 is sleeved on the first rod 41 and is in threaded cooperation with the first rod 41. The second rod 42 is sleeved on the first rod 41, and the lower end surface of the second rod 42 abuts against the upper end surface of the special-shaped nut 44. A guiding groove 411 extending in the vertical direction is provided on one of the first rod 41 and the second rod 42, and a guiding portion 421 is provided on the other one. The guiding portion 421 is slidably arranged in the guiding groove 411. The second rod 42 is threadedly connected to the inner layer of the sleeve assembly 43, and a fixing key 45 extending in the horizontal direction is inserted through the sleeve assembly 43 and the special-shaped nut 44. By rotating the driving gear 3, the driven gear 2 can be driven to rotate, so that the first rod 41 rotates synchronously with the driven gear 2. Due to the restriction of the fixing key 45, the special-shaped nut 44 cannot rotate and can only move up and down in the vertical direction. At the same time, under the guiding and limiting effects of the guiding portion 421 and the guiding groove 411, the special-shaped nut 44 can jack up the second rod 42 and the sleeve assembly 43 to move up and down in the vertical direction, achieving the effect of rapid lifting, having a high lifting efficiency, and being beneficial to improving the operation efficiency.

[0055] Specifically, in this embodiment, referring to Figure 3 and Figure 4 , two guiding grooves 411 are provided on the outer peripheral wall of the first rod 41. Combining Figure 5 and Figure 6 , two guiding portions 421 are provided on the inner wall of the second rod 42, and the two guiding portions 421 are slidably disposed in the two guiding grooves 411 in a one-to-one correspondence. Exemplarily, the guiding portion 421 is a strip-shaped rod fixed on the inner wall of the second rod 42. In other embodiments, the number of the guiding portions 421 and the guiding grooves 411 can be set as required, and the form of the guiding portion 421 can also be arbitrarily selected, as long as it can cooperate with the guiding groove 411 to guide the sliding of the second rod 42 in the vertical direction and can limit the rotation of the second rod 42.

[0056] Optionally, a plurality of fixing keys 45 are circumferentially spaced on the special-shaped nut 44 to further improve the limiting effect on the special-shaped nut 44.

[0057] Exemplarily, in this embodiment, two fixing keys 45 are provided.

[0058] Optionally, as Figure 1 shown, the jacking structure 4 further includes a first limiting member 46. Combining Figure 2 , an annular groove 441 is provided on the special-shaped nut 44. Combining Figure 5 , a through hole 422 penetrating in the horizontal direction is formed on the second rod 42. The annular groove 441 and the through hole 422 enclose a limiting cavity, and the first limiting member 46 is inserted into the limiting cavity. The above setting can prevent the second rod 42 from slipping off the first rod 41 during the lifting process.

[0059] Specifically, two through holes 422 are provided on the second rod 42, and the two through holes 422 are spaced on opposite sides of the special-shaped nut 44.

[0060] Exemplarily, in this embodiment, the first limiting member 46 is a commonly used pin shaft in the art.

[0061] Optionally, as Figure 1As shown, the casing assembly 43 includes a first casing 431 and a second casing 432. The first casing 431 is sleeved on the second rod 42 and is in threaded cooperation with the outer side of the second rod 42. The second casing 432 is sleeved on the first casing 431. A first strip-shaped groove 4311 is provided on one of the first casing 431 and the second casing 432, and a first protrusion 4321 is provided on the other. The first protrusion 4321 is slidably clamped in the first strip-shaped groove 4311. Since the guiding portion 421 and the guiding groove 411 are provided between the first rod 41 and the second rod 42, while the second rod 42 rises in the vertical direction under the jacking of the special-shaped nut 44, the second rod 42 can rotate synchronously with the rotation of the first rod 41. Under the threaded cooperation between the outer side of the second rod 42 and the inner side of the first casing 431, and under the limiting and guiding effects of the first protrusion 4321 and the first strip-shaped groove 4311 between the first casing 431 and the second casing 432, the first casing 431 can move up and down relative to the second rod 42 in the vertical direction, achieving the purpose of increasing the lifting stroke to be applicable to different working environments. That is to say, the maximum height of this multi-section screw jack is the sum of the lengths of the first rod 41, the second rod 42 and the first casing 431. A supporting platform 5 is provided on the upper end surface of the first casing 431 for supporting the object to be lifted. A first hole 4322 is provided on the second casing 432, and a fixing groove 442 is provided on the special-shaped nut 44. The fixing key 45 is inserted into the first hole 4322 and the fixing groove 442 to limit the rotation of the special-shaped nut 44.

[0062] Specifically, in this embodiment, in combination with Figure 7 and Figure 8 , a first strip-shaped groove 4311 is provided on the outer side of the first casing 431; in combination with Figure 9 and Figure 10 , a first protrusion 4321 is provided on the inner side of the second casing 432.

[0063] Exemplarily, only one first strip-shaped groove 4311 and one first protrusion 4321 are provided; in other embodiments, multiple first strip-shaped grooves 4311 and first protrusions 4321 can be provided. As long as it can play a guiding role in the sliding of the first casing 431 in the vertical direction and can limit the rotation of the first casing 431.

[0064] Furthermore, as shown in Figure 1 , a second limiting member 423 is provided on the outer peripheral wall of the second rod 42. When the first casing 431 rises to the top of the second rod 42, the setting of the second limiting member 423 can limit the threaded cooperation between the first casing 431 and the second rod 42, thereby preventing the first casing 431 from slipping off the second rod 42.

[0065] Specifically, in this embodiment, as shown in Figure 5As shown, an anti - detachment hole is provided on the second rod 42, and the second limiting member 423 is inserted into the anti - detachment hole to damage the thread on the outer peripheral wall of the second rod 42, so as to prevent the first sleeve 431 from slipping off; alternatively, in other embodiments, the second limiting member 423 can also be directly embedded in the thread on the outer peripheral wall of the second rod 42.

[0066] Optionally, a clamping groove 4312 is provided in a circumferential direction on the outer wall of the first sleeve 431, and the supporting platform 5 is provided with a clamping member, and the clamping member is clamped in the clamping groove 4312 to realize the detachable connection between the supporting platform 5 and the first sleeve 431.

[0067] Exemplarily, the clamping member is a commonly used circlip in the art.

[0068] Optionally, as Figure 1 shown, the multi - section screw jack further includes a housing structure 6, and the housing mechanism is sleeved outside the jacking structure 4 and is fixed on the base 1. The above - mentioned setting can prevent dust in the working environment from entering the connection between the first rod 41 and the driven gear 2 or the meshing part between the driving gear 3 and the driven gear 2, avoid abnormal wear of each component, and thus extend the service life of the multi - section screw jack.

[0069] Specifically, in this embodiment, the housing structure 6 includes a first shell 61 and a second shell 62. The first shell 61 covers the base 1 and is clamped with the flanging provided on the base 1; a circumferential flanging is provided on the second shell 62, and the second shell 62 is clamped on the first shell 61 through the circumferential flanging. At the same time, a clamping convex is provided in a circumferential direction on the outer wall of the second shell 62, and the clamping convex abuts against the first shell 61 to realize the clamping connection between the second shell 62 and the first shell 61.

[0070] Optionally, a second strip - shaped groove 4323 is provided on one of the second shell 62 and the second sleeve 432, and a second protrusion 63 is provided on the other. The second protrusion 63 is slidably arranged in the second strip - shaped groove 4323 to guide the lifting of the second sleeve 432 in the vertical direction.

[0071] Specifically, in this embodiment, as Figure 9 and Figure 10 shown, the second sleeve 432 is provided with a second strip - shaped groove 4323; as Figure 1 shown, the second shell 62 is provided with a second protrusion 63.

[0072] Optionally, as Figure 1 shown, a bearing 11 is provided between the base 1 and the driven gear 2, and the bearing 11 is rotatably arranged on the base 1. Specifically, the bearing 11 is a thrust ball bearing, and the thrust ball bearing includes upper and lower end faces and balls arranged between the two end faces. Combining Figure 3, a clamping portion 412 is provided at the bottom end of the first rod 41. The clamping portion 412 is inserted into the driven gear 2 and can rotate synchronously with the driven gear 2; a flange is provided on the clamping portion 412, which penetrates through the driven gear 2 and is clamped with the upper end surface to realize the connection between the driven gear 2 and the upper end surface. The base 1 is connected to the lower end surface. The ball can convert the sliding friction between the driven gear 2 and the base 1 into rolling friction, thereby reducing the frictional resistance and making it easier for the operator to drive the driving gear 3 to rotate.

[0073] Optionally, an operating rod 31 is connected to the side of the driving gear 3 away from the driven gear 2 to facilitate the operator to rotate the driven gear 2 and improve the operation efficiency.

[0074] Specifically, referring to Figure 1 , a protective shell is sleeved on the operating rod 31, and an annular flange is also provided on the protective shell to realize the clamping with the first shell 61 through the annular flange.

[0075] Obviously, the above-mentioned embodiments of the present invention are only examples for clearly explaining the present invention, and are not intended to limit the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A multi-section screw jack, characterized in that: include: Base (1); A driven gear (2) rotatably disposed on the base (1); A driving gear (3), the driving gear (3) meshing with the driven gear (2); The lifting structure (4) comprises a first rod (41), a second rod (42), a sleeve assembly (43) and a special-shaped nut (44), wherein the first rod (41) is connected to the driven gear (2) and can rotate synchronously with the driven gear (2); the special-shaped nut (44) is sleeved on the first rod (41) and threadedly matched with the first rod (41); the second rod (42) is sleeved on the first rod (41), and the lower end surface of the second rod (42) abuts against the driven gear (2). The upper end surface of the special-shaped nut (44); a guide groove (411) extending in a vertical direction is provided on one of the first rod (41) and the second rod (42), and a guide portion (421) is provided on the other, and the guide portion (421) is slidably arranged in the guide groove (411); the sleeve assembly (43) is sleeved on the second rod (42), and a fixing key (45) extending in a horizontal direction is passed through the sleeve assembly (43) and the special-shaped nut (44).

2. The multi-section screw jack according to claim 1, characterized in that: The lifting structure (4) further includes a first limiting member (46); The special-shaped nut (44) is provided with an annular groove (441), the second rod (42) is provided with a through hole (422) penetrating in the horizontal direction, the annular groove (441) and the through hole (422) enclose a limiting cavity, and the first limiting member (46) is penetrated in the limiting cavity.

3. The multi-section screw jack according to claim 1, characterized in that: The sleeve assembly (43) comprises a first sleeve (431) and a second sleeve (432); The first sleeve (431) is sleeved on the second rod (42) and is matched with the outer thread of the second rod (42); the upper end surface of the first sleeve (431) is provided with a supporting platform (5), and the lower end surface of the first sleeve (431) is in contact with the upper end surface of the second rod (42); the second sleeve (432) is sleeved on the first sleeve (431), one of the first sleeve (431) and the second sleeve (432) is provided with a first strip groove (4311), and the other is provided with a first protrusion (4321), and the first protrusion (4321) can be slidably clamped in the first strip groove (4311); The second sleeve (432) is provided with a first hole (4322), the special-shaped nut (44) is provided with a fixing groove (442), and the fixing key (45) is inserted into the first hole (4322) and the fixing groove (442).

4. The multi-section screw jack according to claim 3, characterized in that: A second limiting member (423) is provided on the outer peripheral wall of the second rod (42).

5. The multi-section screw jack according to claim 3, characterized in that: The outer wall of the first sleeve (431) is provided with a clamping groove (4312) along a circumferential ring, and the supporting platform (5) is provided with a clamping piece, and the clamping piece is clamped in the clamping groove (4312).

6. The multi-section screw jack according to claim 1, characterized in that: The multi-section screw jack also includes an outer shell structure (6), which is sleeved on the outside of the lifting structure (4) and fixed on the base (1).

7. The multi-section screw jack according to claim 6, characterized in that: The outer shell structure (6) comprises a first shell (61) and a second shell (62); the first shell (61) is covered on the base (1); the second shell (62) is provided with an annular flange; the second shell (62) is clamped on the first shell (61) via the annular flange.

8. The multi-section screw jack according to any one of claims 1 to 7, characterized in that: A plurality of fixing keys (45) are arranged at intervals along the circumference of the special-shaped nut (44).

9. The multi-section screw jack according to any one of claims 1 to 7, characterized in that: A bearing (11) is arranged between the base (1) and the driven gear (2), the first rod (41) is connected to the driven gear (2), and the bearing (11) is rotatably arranged on the base (1).

10. The multi-section screw jack according to any one of claims 1 to 7, characterized in that: A side of the driving gear (3) away from the driven gear (2) is connected to an operating rod (31).

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