CN218320482U

CN218320482U - Speed-changing jack

Info

Publication number: CN218320482U
Application number: CN202121406601.4U
Authority: CN
Inventors: 陆关贤; 金祖民
Original assignee: Hangzhou Rhino Machinery Co ltd
Current assignee: Hangzhou Rhino Machinery Co ltd
Priority date: 2021-06-23
Filing date: 2021-06-23
Publication date: 2023-01-17
Anticipated expiration: 2031-06-23

Abstract

The application relates to a speed change jack, which comprises a jack body and a speed change mechanism, wherein the jack body comprises a driven shaft, the speed change mechanism comprises a speed change shell and a driving shaft, and the speed change mechanism further comprises a driving gear; a limiting assembly is arranged at the joint of the speed change shell and the driving shaft, the limiting assembly comprises a limiting sleeve, a plurality of whole-circle limiting grooves are formed in the inner side wall of the limiting sleeve, a limiting hole perpendicular to the axis is formed in the driving shaft, a limiting spring is arranged in the limiting hole, and limiting balls are arranged at two ends of the limiting spring; one half of the limiting ball is positioned in the limiting hole, and the other half of the limiting ball is positioned in the limiting groove; when the corresponding driving gear is matched with the driven gear by moving the driving shaft, the limiting ball is positioned in the corresponding limiting groove. When the driving gear on the driving shaft is matched with the driven gear on the driven shaft, the limiting ball is positioned in the limiting groove to limit the position of the driving shaft, so that the driving gear is stably matched with the driven gear, and the slippage is reduced. This application has more convenient effect when making operating personnel operate.

Description

Speed-changing jack

Technical Field

The application relates to the technical field of jacks, in particular to a variable-speed jack.

Background

The jack is the simplest hoisting equipment with small hoisting height, and is divided into a mechanical jack and a hydraulic jack, wherein the mechanical jack adopts a mechanical principle, a handle is pulled repeatedly, a claw pulls a ratchet wheel to rotate at a clearance, and a bevel pinion drives a bevel pinion to rotate a lifting screw rod, so that a lifting sleeve can be lifted or lowered, and the function of hoisting tension is achieved.

The speed changing device is arranged in some large jacks (namely, jacks for supporting heavier objects), and has the functions of lifting the jack in a low-torque and high-speed mode when no heavy object is supported at the upper end of the jack and lifting the jack in a high-torque and low-speed mode when a heavy object is supported at the upper end of the top end of the jack.

Most of the existing jack speed changing devices are provided with a plurality of driven gears fixed on a driven shaft, and a plurality of driving gears fixed on a driving shaft; the speed of the driving shaft is constant, when different driven gears are matched with the driving gear, the rotating speed ratio is different, the speed of the driven shaft is different, and speed change is realized. However, the driving shaft of the existing jack speed changing device is lack of limitation, and the driving shaft is easy to move so that the driven gear is separated from the driving gear, and the operation difficulty of operators is increased.

In view of the above-mentioned related art, the inventor considers that the existing jack speed changing device has the defect of inconvenient operation.

SUMMERY OF THE UTILITY MODEL

For jack speed change gear convenient operation, this application provides a variable speed jack.

The application provides a variable speed jack adopts following technical scheme:

a speed change jack comprises a jack body and a speed change mechanism for changing the speed of the jack body, wherein the jack body comprises a driven shaft, the speed change mechanism comprises a speed change shell and a driving shaft, and the speed change mechanism further comprises a plurality of driven gears arranged on the driven shaft and a plurality of driving gears arranged on the driving shaft; a limiting assembly is arranged at the joint of the speed change shell and the driving shaft, the limiting assembly comprises a limiting sleeve fixedly connected with the speed change shell, a plurality of whole-circle limiting grooves are formed in the inner side wall of the limiting sleeve, a limiting hole perpendicular to the axis is formed in the driving shaft, a limiting spring is arranged in the limiting hole, and limiting balls are arranged at two ends of the limiting spring; one half of the limiting ball is positioned in the limiting hole, and the other half of the limiting ball is positioned in the limiting groove; when the corresponding driving gear is matched with the driven gear by moving the driving shaft, the limiting ball is positioned in the corresponding limiting groove.

Through adopting above-mentioned technical scheme, when the driving gear on the driving shaft and the driven gear on the driven shaft cooperate, spacing ball is located the spacing inslot, inject the position of driving shaft, makes driving gear and driven gear cooperation stable, reduces and slides, and operating personnel only need rotate the driving shaft, and is more convenient when making operating personnel operate.

Optionally, the outside of the junction of the speed change shell and the driving shaft is provided with a waterproof assembly, the waterproof assembly comprises a waterproof soft sleeve connected with the speed change shell, one end, away from the speed change shell, of the waterproof soft sleeve is provided with a waterproof bearing, and the waterproof bearing is rotatably connected with the driving shaft.

Through adopting above-mentioned technical scheme, waterproof soft cover can prevent as far as possible that the speed change mechanism is interior to intake, and waterproof bearing does not influence the rotation of driving shaft.

Optionally, a plurality of waterproof steel rings are uniformly arranged in the waterproof soft sleeve.

Through adopting above-mentioned technical scheme, the water-proof steel ring can support the soft cover, prevents as far as possible that the soft cover from influencing the removal of driving shaft.

Optionally, the jack body further includes a top cylinder for jacking up an object, a middle cylinder slidably connected to the top cylinder, and a bottom cylinder slidably connected to the middle cylinder; a plurality of lifting grooves are uniformly formed in one side of the bottom cylinder along the vertical direction, a lifting assembly is arranged at one end of the middle cylinder, which is connected with the bottom cylinder in a sliding mode, and the lifting assembly comprises a lifting rod which is connected with the middle cylinder in a sliding mode and one end of the lifting rod is located in the lifting grooves.

Through adopting above-mentioned technical scheme, extract the lifter, can drive well jar and then drive the top jar rebound, can rise the top jar fast, promote the convenience of using.

Optionally, the middle cylinder is provided with a lifting seat at the lifting rod, a lifting cavity is arranged in the lifting seat, the lifting rod passes through the lifting cavity, the lifting cavity is provided with a lifting spring, the lifting spring is sleeved on the lifting rod, and the lifting rod is provided with a lifting stop block abutting against the lifting spring at the position of the side wall of the lifting cavity close to the bottom cylinder.

Through adopting above-mentioned technical scheme, when extracting the lifter, the lift dog compression lifting spring, when arriving the assigned position, lifting spring extension makes the lifter insert appointed lift inslot portion, prevents dropping of lifter as far as possible, promotes the stability of supporting.

Optionally, the two opposite sides of the bottom cylinder are provided with the lifting grooves, and the two lifting assemblies are respectively located on two sides of the middle cylinder corresponding to the lifting grooves.

Through adopting above-mentioned technical scheme, stability when cylinder and end jar go up and down in the reinforcing, there is lifting unit both sides, the operator's both hands concurrent operation of also being convenient for.

Optionally, a tension spring is arranged at the top of the bottom cylinder close to one end of the middle cylinder, one end of the tension spring is connected with the middle cylinder, and the other end of the tension spring is connected with the bottom cylinder.

Through adopting above-mentioned technical scheme, tensioning spring can prevent the separation of well jar and bottom cylinder as far as.

Optionally, a support stop block is arranged on the outer side of the bottom cylinder and used for supporting one end of the middle cylinder close to the bottom cylinder when the tension spring is in an initial state.

Through adopting above-mentioned technical scheme, when the support dog is used for making well jar not use, support well jar, promote the support nature.

In summary, the present application includes at least one of the following beneficial technical effects:

1. when the driving gear on the driving shaft is matched with the driven gear on the driven shaft, the limiting ball is positioned in the limiting groove to limit the position of the driving shaft, so that the driving gear is stably matched with the driven gear, the slippage is reduced, an operator only needs to rotate the driving shaft, and the operation of the operator is more convenient.

Drawings

Fig. 1 is a schematic view of the overall structure of a speed-changing jack in the embodiment of the present application.

Fig. 2 is a sectional view of a shifting jack according to an embodiment of the present application.

Fig. 3 is an enlarged view of a portion a in fig. 2 in the embodiment of the present application.

Fig. 4 is an enlarged view of a portion B in fig. 2 in the embodiment of the present application.

Description of reference numerals: 1. a jack body; 11. a driven shaft; 12. jacking the cylinder; 13. a middle cylinder; 14. a bottom cylinder; 141. a lifting groove; 2. a speed change mechanism; 21. a transmission housing; 22. a drive shaft; 221. a limiting hole; 23. a driven gear; 231. a big driven gear; 232. a small slave gear; 24. a driving gear; 241. an bull gear; 242. a small main gear; 3. a limiting component; 31. a limiting sleeve; 311. a limiting groove; 32. a limiting spring; 33. a limiting ball; 4. a waterproof assembly; 41. a waterproof soft sleeve; 42. a waterproof bearing; 43. a waterproof steel ring; 5. a lifting assembly; 51. a lifting rod; 52. a lifting seat; 521. a lifting cavity; 53. a lift spring; 54. a lifting stop block; 6. tensioning the spring; 7. and supporting the stopper.

Detailed Description

The present application is described in further detail below with reference to figures 1-4.

The embodiment of the application discloses a variable speed jack.

Referring to fig. 1 and 2, a speed-changing jack includes a jack body 1, a speed-changing mechanism 2, a waterproof assembly 4, and a lifting assembly 5; the speed change mechanism 2 enables the jack body 1 to lift at different speeds, and is suitable for quick lifting and accurate lifting at the same time, and the lifting assembly 5 operates the jack body 1 to lift quickly and is suitable for lifting in a larger range; the waterproof assembly 4 is arranged on one side of the speed change mechanism 2, and can prevent water from entering the speed change mechanism 2 as much as possible.

Referring to fig. 2 and 4, in order to lift the jack body 1, the jack body 1 includes a top cylinder 12, a middle cylinder 13, and a bottom cylinder 14, wherein a plurality of lifting grooves 141 are respectively formed on both sides of the bottom cylinder 14 along a vertical direction, the top cylinder 12 is sleeved on the middle cylinder 13 and is slidably connected with the middle cylinder 13, and the middle cylinder 13 is sleeved on the bottom cylinder 14 and is slidably connected with the bottom cylinder 14. Lifting unit 5 includes lifter 51, lifting seat 52, lift spring 53 and lift dog 54, lifting unit 5 is equipped with two and is located the relative both sides in well jar 13 bottom respectively and makes the operation of operating personnel's both hands more convenient, lifting seat 52 is through welded fastening on well jar 13, lifter 51 passes lifting seat 52 and well jar 13 lateral wall and inserts in the lift groove 141 of end jar 14, lifting seat 52 is inside to have seted up lift chamber 521, lift spring 53 is located lift chamber 521 and overlaps and establish on lifter 51, lift dog 54 is located lift chamber 521 and is welded fastening on lifter 51, lift dog 54 is located one section one end that is close to well jar 13 in lift chamber 521. An operator pulls out the lifting rod 51, the lifting stop block 54 compresses the lifting spring 53, the lifting rod 51 is separated from the lifting groove 141, then the middle cylinder 13 can be driven to be quickly lifted, the position is found, the lifting rod 51 is loosened, the lifting spring 53 returns to the lifting stop block 54, and the lifting stop block 54 drives the lifting rod 51 to be inserted into the lifting groove 141. The middle cylinder 13 can be quickly lifted and adapted to adjustment in a large range. The lift spring 53 presses the lift stopper 54, so that the lift lever 51 is prevented from falling as much as possible, and stability is ensured.

In order to connect the middle cylinder 13 and the bottom cylinder 14, two tension springs 6 are arranged between the inside of the middle cylinder 13 and the top of the bottom cylinder 14, and the bottom cylinder 14 is provided with a support stop 7 at the bottom of the middle cylinder 13 when the tension springs 6 are in the initial position. One end of the tension spring 6 is fixedly connected with the middle cylinder 13 by welding, and the other end of the tension spring is fixedly connected with the bottom cylinder 14 by welding, so that the middle cylinder 13 is connected with the bottom cylinder 14, and the middle cylinder 13 is prevented from being separated from the bottom cylinder 14 as much as possible. The support stopper 7 supports the middle cylinder 13 when the middle cylinder 13 is not in use, and prevents the middle cylinder 13 from compressing the tension spring 6 for a long time to damage the tension spring 6.

Referring to fig. 2 and 3, the jack body 1 is provided with a driven shaft 11 at one end of the top cylinder 12 far away from the middle cylinder 13, and the speed change mechanism 2 comprises a speed change housing 21, a driving shaft 22, a driven gear 23 and a driving gear 24. The speed change housing 21 is fixed on one side of the top cylinder 12 through welding, the driven shaft 11 penetrates through the top cylinder 12 and the speed change housing 21, and the driven shaft 11 is rotatably connected with the top cylinder 12 and the speed change housing 21. The driven gear 23 includes a large driven gear 231 and a small driven gear 232, both the large driven gear 231 and the small driven gear 232 are fixedly welded to the driven shaft 11 at one stage of the shift problem, and the large driven gear 231 and the small driven gear 232 are provided at an interval. The driving shaft 22 penetrates through one side wall of the top cylinder 12 of the transmission housing 21, the driving shaft 22 is in clearance fit with the transmission housing 21 and the side wall of the top cylinder 12, the driving gear 24 comprises a master gear 241 and a slave gear 242, the master gear 241 and the slave gear 242 are both welded and fixed to one section of the driving shaft 22 located in the transmission housing 21, the driving gear 24 is located between a master gear 231 and a slave gear 232, the master gear 241 is close to the slave gear 232, and the slave gear 242 is close to the master gear 231. The variable speed of three gears can be realized, and the variable speed gear is respectively: the high speed at which the large main gear 241 meshes with the small slave gear 232 is adjusted quickly, the medium speed at which it does not mesh is adjusted normally, and the low speed at which the small main gear 242 meshes with the large slave gear 231 is adjusted precisely.

In order to prevent the driving shaft 22 from deviating, the speed change jack also comprises a limiting component 3, wherein the limiting component 3 comprises a limiting sleeve 31, a limiting spring 32 and a limiting ball 33; the limiting sleeve 31 is sleeved on the driving shaft 22 and fixedly connected with the speed changing casing 21 through welding, 4 annular limiting grooves 311 are formed in the limiting sleeve 31, 2 limiting holes 221 are formed in the driving shaft 22 at intervals, the distance between the two limiting holes 221 is the same as that between the two limiting grooves 311, two limiting springs 32 are arranged and located in the two limiting holes 221 respectively, 4 two ends located in the two limiting springs 32 respectively are arranged on the limiting ball 33, and when the limiting holes 221 are matched with the limiting grooves 311, half of the limiting ball 33 is located in the limiting holes 221 and half of the limiting groove 311. The three limiting modes are provided, wherein the two limiting holes 221 are matched with the two limiting grooves 311 on one side, the two limiting holes 221 are matched with the two limiting grooves 311 in the middle, and the two limiting holes 221 are matched with the two limiting holes 221 on the other side. Three kinds of spacing modes and three kinds of driving gear 24 and driven gear 23 meshing mode match, carry on spacingly to the position of driving shaft 22, make driving gear 24 and driven gear 23 cooperation stable, reduce the slip of driving shaft 22, and operating personnel only need rotate driving shaft 22, and is more convenient when making operating personnel operate.

For preventing into water and then influencing the use as far as possible speed change mechanism 2, waterproof component 4 includes waterproof flexible cover 41, waterproof bearing 42, waterproof steel ring 43, waterproof flexible cover 41 cover is on spacing sleeve 31 and driving shaft 22, waterproof flexible cover 41 one end is passed through sealing glue and waterproof bearing 42 fixed connection with variable speed casing 21 through sealing glue fixed connection one end, waterproof bearing 42 overlaps on driving shaft 22, make driving shaft 22 can rotate and take waterproof flexible cover 41 to slide, do not influence the use of driving shaft 22. Waterproof steel ring 43 is equipped with a plurality ofly, all is located waterproof soft cover 41, and waterproof steel ring 43 passes through sticky and waterproof soft cover 41 fixed connection, and waterproof steel ring 43 supports waterproof soft cover 41, prevents waterproof soft cover 41 clamp as far as and influences between driving shaft 22 and spacing sleeve 31 and locate.

The implementation principle of the speed-changing jack in the embodiment of the application is as follows:

in the first step, the operator pulls out the lifting rod 51, the lifting stop 54 compresses the lifting spring 53 to separate the lifting rod 51 from the lifting slot 141, then the middle cylinder 13 can be driven to lift rapidly, then the position is accurately found, the lifting rod 51 is released, the lifting spring 53 resets and rebounds to the lifting stop 54, and the lifting stop 54 drives the lifting rod 51 to be inserted into the lifting slot 141. The middle cylinder 13 can be quickly lifted and adapted to adjustment in a large range.

In the second step, the driving shaft 22 is moved to rapidly adjust the high speed at which the master gear 241 is engaged with the slave gear 232.

And thirdly, moving the driving shaft 22 to adjust at a non-meshed medium speed.

In the fourth step, the low speed at which the driving shaft 22 is moved and the small master gear 242 is engaged with the large slave gear 231 is precisely adjusted.

The second step can choose for use according to actual conditions to the fourth step, and in the accommodation process of the second step to the fourth step, spacing subassembly 3 carries on spacingly to driving shaft 22's position, makes driving gear 24 and driven gear 23 cooperation stable, reduces driving shaft 22's slip, and operating personnel only need rotate driving shaft 22, and is more convenient when making operating personnel operate.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A variable-speed jack comprises a jack body (1) and a variable-speed mechanism (2) for enabling the jack body (1) to change speed, wherein the jack body (1) comprises a driven shaft (11), the variable-speed mechanism (2) comprises a variable-speed shell (21) and a driving shaft (22), and the variable-speed mechanism (2) further comprises a plurality of driven gears (23) arranged on the driven shaft (11) and a plurality of driving gears (24) arranged on the driving shaft (22); the method is characterized in that: a limiting assembly (3) is arranged at the joint of the speed change shell (21) and the driving shaft (22), the limiting assembly (3) comprises a limiting sleeve (31) fixedly connected with the speed change shell (21), a plurality of whole-circle limiting grooves (311) are formed in the inner side wall of the limiting sleeve (31), a limiting hole (221) perpendicular to the axis is formed in the driving shaft (22), a limiting spring (32) is arranged in the limiting hole (221), and limiting balls (33) are arranged at two ends of the limiting spring (32); one half of the limiting ball (33) is positioned in the limiting hole (221), and the other half of the limiting ball is positioned in the limiting groove (311); when the driving gear (24) and the driven gear (23) are engaged with each other by moving the driving shaft (22), the limit balls (33) are located in the corresponding limit grooves (311).

2. A shifting jack according to claim 1, wherein: the utility model discloses a speed change casing (21) is equipped with waterproof component (4) with driving shaft (22) junction outside, waterproof component (4) include waterproof soft cover (41) of being connected with speed change casing (21), the one end that speed change casing (21) were kept away from in waterproof soft cover (41) is equipped with waterproof bearing (42), waterproof bearing (42) rotate with driving shaft (22) and are connected.

3. A shifting jack according to claim 2, wherein: a plurality of waterproof steel rings (43) are uniformly arranged in the waterproof soft sleeve (41).

4. A shifting jack according to claim 1, wherein: the jack body (1) further comprises a top cylinder (12) for jacking an object, a middle cylinder (13) connected with the top cylinder (12) in a sliding manner and a bottom cylinder (14) connected with the middle cylinder (13) in a sliding manner; a plurality of lift grooves (141) have evenly been seted up along vertical direction to end jar (14) one side, well jar (13) are equipped with lifting unit (5) with end jar (14) sliding connection's one end, lifting unit (5) include with well jar (13) sliding connection, one end be located lifter (51) in lift groove (141).

5. A shifting jack according to claim 4, wherein: the middle cylinder (13) is provided with a lifting seat (52) at a lifting rod (51), a lifting cavity (521) is arranged in the lifting seat (52), the lifting rod (51) penetrates through the lifting cavity (521), the lifting cavity (521) is provided with a lifting spring (53), the lifting spring (53) is sleeved on the lifting rod (51), and a lifting stop block (54) abutted against the lifting spring (53) is arranged at the position, close to the bottom cylinder (14), of the side wall of the lifting cavity (521) of the lifting rod (51).

6. A shifting jack according to claim 5, wherein: the two opposite sides of the bottom cylinder (14) are provided with the lifting grooves (141), and the two lifting components (5) are respectively positioned on the two sides of the middle cylinder (13) corresponding to the lifting grooves (141).

7. A shifting jack according to claim 4 in which: the top of the bottom cylinder (14) close to one end of the middle cylinder (13) is provided with a tension spring (6), one end of the tension spring (6) is connected with the middle cylinder (13), and the other end of the tension spring is connected with the bottom cylinder (14).

8. A shifting jack according to claim 4 in which: and a supporting stop block (7) which is used for supporting one end of the middle cylinder (13) close to the bottom cylinder (14) when the tension spring (6) is in an initial state is arranged on the outer side of the bottom cylinder (14).