CN209740588U

CN209740588U - Self-locking jack

Info

Publication number: CN209740588U
Application number: CN201920367186.2U
Authority: CN
Inventors: 叶培玉; 黄君明
Original assignee: NINGBO TIANYI SHAFT CO Ltd
Current assignee: NINGBO TIANYI SHAFT CO Ltd
Priority date: 2019-03-22
Filing date: 2019-03-22
Publication date: 2019-12-06
Anticipated expiration: 2029-03-22

Abstract

The utility model discloses a self-locking jack, which comprises a spiral jack and a self-locking protection device; the screw jack comprises a power device and a transmission shaft in transmission connection with the power device, a pinion is installed on the transmission shaft, the pinion and the gear wheel form gear meshing transmission, the gear wheel is installed on a screw rod of a ball screw, a nut of the ball screw is fixedly connected with an inner tube, the inner tube is installed on a bottom plate, an outer tube is sleeved outside the inner tube, the screw rod of the ball screw is fixedly connected with the outer tube, a self-locking protection device comprises a locking ratchet wheel fixedly connected with the gear wheel and a locking pawl matched with the locking ratchet wheel, the locking pawl is fixed on the outer tube through a locking pawl sleeve, a first elastic assembly is arranged between the locking pawl and the locking pawl sleeve, and the first elastic assembly can enable the locking pawl to be locked or loosened through stretching or compression so as to realize locking or normal transmission of the jack.

Description

Self-locking jack

Technical Field

the utility model relates to a jack technical field especially relates to a from locking-type jack.

background

The jack is light and small lifting equipment which takes a rigid jacking piece as a working device and jacks a heavy object through a top bracket or a bottom supporting claw within a small stroke. Divide into mechanical type and fluid pressure type two kinds usually, mechanical type jack has rack formula and spiral two kinds again, traditional spiral jack adopts trapezoidal lead screw to carry out the transmission usually, trapezoidal screw possesses certain auto-lock ability, stop when jack load jack-up certain height, the lead screw possesses auto-lock performance, can not automatic landing, nevertheless because trapezoidal screw-nut is the slip transmission, transmission efficiency is lower, generally only 35 ~ 40% transmission efficiency, also generally need great torsion to accomplish at the promotion in-process of jack.

Chinese patent with publication number CN207468087U discloses a jack with self-locking and high efficiency for a ball screw caravan, which comprises a direct current motor, a worm gear speed reducer, an electromagnetic brake, a housing and a transmission pin, wherein the electromagnetic brake is installed on a rear end cover of the direct current motor, the direct current motor is connected with the worm gear speed reducer, an output shaft of the worm gear speed reducer is connected with the ball screw through a connecting shaft, the transmission pin penetrates through the connecting shaft to be connected with the ball screw, the ball screw is connected with a ball nut, a magnetic column is arranged on the ball nut, the ball nut is fixedly riveted with an inner tube, the inner tube is arranged in the outer tube, and a hall sensor is installed on the outer tube. This take auto-lock, high-efficient ball screw jack for car as a house, control system have used long-life, the IMD operating panel technique of full waterproof to adopt single chip microcomputer control circuit system, can carry out accurate control on initial point, stroke, and the design has high temperature automatic power-off protection circuit, overload protection circuit, wrong automatic alarm lamp function.

The ball screw is used for replacing a trapezoidal screw to carry out transmission, sliding transmission is changed into rolling transmission, transmission efficiency can be greatly improved, operation is more labor-saving, but the ball screw does not have a self-locking function, and an effective self-locking device needs to be designed in a matched mode.

SUMMERY OF THE UTILITY MODEL

To the technical problem, the utility model aims at providing an utilize ball to carry out the transmission and have mechanical type auto-lock protection device's spiral jack, transmission efficiency is high, the laborsaving, the security performance of operation is high.

In order to achieve the above object, the utility model discloses a technical scheme be: the self-locking jack comprises a jack and a self-locking protection device;

the jack comprises a power device and a transmission shaft in transmission connection with the power device, a pinion is mounted on the transmission shaft, the pinion and a gearwheel form gear meshing transmission, the gearwheel is mounted on a screw rod of a ball screw, a nut of the ball screw is fixedly connected with an inner tube, the inner tube is mounted on a bottom plate, an outer tube is sleeved outside the inner tube, the screw rod of the ball screw is fixedly connected with the outer tube,

The self-locking protection device comprises a stop ratchet fixedly connected with the large gear and a stop pawl matched with the stop ratchet, the stop pawl is fixed on the outer tube through a stop pawl sleeve, a first elastic assembly is arranged between the stop pawl and the stop pawl sleeve, and the stop pawl can be clamped or loosened through stretching or compressing the first elastic assembly, so that the stop or normal transmission of the jack is realized.

Preferably, the power device comprises a hand crank, the hand crank is connected with the transmission shaft through a transmission device, and transmission of the jack is achieved through rotation of the hand crank.

Preferably, transmission includes the gloves, the one end of gloves links firmly on the cranking bar, other pot head establish on the transmission shaft, the tip that the transmission shaft is located the gloves is provided with outer hexagonal or outer octagon, the inside correspondence of gloves sets up hexagon socket head or interior octagon, through the transmission of interior outer hexagonal or interior octagon's cooperation realization cranking bar and transmission shaft.

Preferably, the handle sleeve is further internally provided with a second elastic assembly, one end of the second elastic assembly abuts against the end of the handle, the other end of the second elastic assembly abuts against the end of the transmission shaft, reciprocating motion of the handle sleeve relative to the transmission shaft can be realized by stretching or contracting the second elastic assembly, the stop pawl sleeve is further provided with a stop pawl push rod capable of rotating around the axis of the stop pawl push rod, one end of the stop pawl push rod is in contact fit with the outer peripheral surface of the handle sleeve, the other end of the stop pawl push rod is in contact fit with the stop pawl, the outer peripheral surface of the handle sleeve matched with the stop pawl push rod is provided with a conical surface, and the stop pawl push rod can be pushed to rotate by reciprocating motion of the handle sleeve, so that the stop pawl is pushed to be clamped inwards or outwards loosened by the stop ratchet wheel.

Preferably, the first elastic component enables the stop pawl to be in a state of clamping the stop ratchet wheel in a normal state.

Preferably, the second elastic component enables the shaking sleeve to be matched with the locking claw push rod to push the locking claw to be clamped in a locking ratchet wheel state under a normal state, when the lifting jack is used, the shaking sleeve is compressed towards the transmission shaft, so that the shaking sleeve is changed from conical surface contact to cylindrical surface contact with the locking claw push rod, the locking claw push rod is further pushed to outwards shift the locking claw, and the transmission of the lifting jack is achieved.

Preferably, the pinion and the gearwheel are both bevel gears.

Preferably, the stop ratchet and the gearwheel are arranged integrally.

The utility model has the advantages that: 1. the ball screw is used as a transmission part of the jack, so that the transmission efficiency is greatly improved, and the operation is more labor-saving; 2. the self-locking protection device is arranged, and the jack can be effectively braked by matching the shaking sleeve with the locking claw, so that the safety performance in use is ensured.

drawings

FIG. 1 is a schematic structural diagram of a preferred embodiment of the present invention;

Fig. 2 is an enlarged view of a portion of the self-locking protection device of fig. 1.

Detailed Description

The following detailed description of the preferred embodiments of the present invention will be provided in conjunction with the accompanying drawings, so as to enable those skilled in the art to more easily understand the advantages and features of the present invention, and thereby define the scope of the invention more clearly and clearly.

referring to fig. 1, an embodiment of the present invention includes:

The utility model provides a from locking-type jack, includes jack and auto-lock protection device, the jack includes transmission shaft 1 and shaking handle 3, shaking handle 3 with connect through shaking handle 15 transmission between the transmission shaft 1, the one end of shaking handle 15 links firmly with shaking handle 3, another pot head is established on the transmission shaft 1, the tip that transmission shaft 1 is located shaking handle 15 is provided with outer hexagonal 17, the inside of shaking handle 15 corresponds sets up interior hexagonal, realizes the transmission of shaking handle 3 and transmission shaft 1 through the cooperation of interior hexagonal, still be provided with shaking handle spring 16 in the shaking handle 15, shaking handle spring 16 one end is pushed up and is leaned on the tip of shaking handle 3, the other end pushes up and leans on the tip of transmission shaft 1, through the extension or the shrink of shaking handle spring 16, can realize shaking handle 15 for the transmission shaft 1 does the left and right movement, install bevel gear 2 on the transmission shaft 1, the upper bevel gear 2 and the lower bevel gear 4 form gear engagement transmission, the lower bevel gear 4 is arranged at the top of a screw rod 8 of a ball screw, a nut 6 of the ball screw is fixedly arranged with an inner tube 7 through a nut positioning plate, the inner tube 7 is arranged on a bottom plate 10, an outer tube 9 is sleeved outside the inner tube 7, the screw rod 8 of the ball screw is arranged in the outer tube 9 through a gear positioning plate, the transmission shaft 1 is fixed on the outer tube 9 through a shaft sleeve,

Referring to fig. 2, the self-locking protection device includes a stop ratchet 5 integrally disposed with a lower bevel gear 4, and a stop pawl 11 engaged with the stop ratchet 5, the stop pawl 11 is fixed on the outer tube 9 through a stop pawl sleeve 12, a pin is disposed on the stop pawl sleeve 12, a stop spring 13 is disposed between the stop pawl 11 and the pin, the stop pawl 11 can move left and right by stretching or compressing the stop spring 13, and then the stop pawl 5 is locked or released, so as to realize the stop or normal transmission of the jack, a stop pawl push rod 14 capable of rotating around the axis thereof is further mounted on the stop pawl sleeve 12, one end of the stop pawl push rod 14 is in contact fit with the outer peripheral surface of a shaking handle sleeve 15, the other end is in contact fit with the stop pawl 11, a conical surface is disposed on the outer peripheral surface of the shaking handle 15 engaged with the stop pawl push rod 14, through the left and right movement of the shaking sleeve 15, the shaking sleeve 15 can push the stop pawl push rod 14 to rotate, so that the stop pawl 11 is pushed to be clamped or the stop ratchet wheel 5 is loosened, the stop pawl 11 is in a state of clamping the stop ratchet wheel 5 under the normal state by the stop spring 13, the shaking sleeve 15 and the stop pawl push rod 14 are pushed out under the normal state by the shaking spring 16, so that the stop pawl 11 is in a state of clamping the stop ratchet wheel 5, when the shaking sleeve 15 is compressed towards the transmission shaft 1 during use, the conical surface contact of the shaking sleeve 15 and the stop pawl push rod 14 is changed into the cylindrical surface contact, the stop pawl push rod 14 outwards shifts the stop pawl 11, and the transmission of the jack is realized.

The working principle of the embodiment is as follows: the jack is placed on the ground through a bottom plate 10, an object to be lifted is fixed at the top of an outer tube 9 through threads or other connection modes, an operator presses a hand crank 3 towards a transmission shaft 1 to enable a contact surface between a hand crank sleeve 15 and a stop pawl push rod 14 to be changed into an outer circumferential surface from a conical surface, so that the stop pawl push rod 14 drives a stop pawl 11 to be separated from a stop ratchet 5, the jack enters a transmission mode, the operator sequentially drives the transmission shaft 1, an upper conical gear 2, a lower conical gear 4 and a screw 8 of a ball screw to transmit through rotating the hand crank 3 to enable the outer tube 9 and an inner tube 7 to do vertical relative motion to realize the lifting of the object, when the object is lifted to a required position, the rotation of the hand crank 3 is stopped, a hand crank spring 16 resets to drive a hand crank 15 to move relative to the transmission shaft 1, a stop spring 13 resets to drive the stop pawl 11 to clamp the stop ratchet 5, and the braking of the, when the jack is not used, the stopping pawl 11 is in a normal state of clamping the stopping ratchet wheel 5, so that the safety of the jack is ensured.

The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A self-locking jack is characterized by comprising a jack and a self-locking protection device;

2. The self-locking jack according to claim 1, wherein the power device comprises a handle, the handle is connected with the transmission shaft through a transmission device, and the transmission of the jack is realized by rotating the handle.

3. The self-locking jack according to claim 2, wherein the transmission device comprises a shaking sleeve, one end of the shaking sleeve is fixedly connected to the shaking handle, the other end of the shaking sleeve is sleeved on the transmission shaft, an outer hexagonal or an outer octagonal is arranged at the end part of the transmission shaft located in the shaking sleeve, an inner hexagonal or an inner octagonal is correspondingly arranged inside the shaking sleeve, and transmission between the shaking handle and the transmission shaft is realized through matching of the inner hexagonal or the outer octagonal.

4. The self-locking jack according to claim 3, wherein a second elastic component is further provided in the hand crank sleeve, one end of the second elastic component props against the end part of the hand crank, the other end of the second elastic component props against the end part of the transmission shaft, and by stretching or contracting the second elastic component, the reciprocating motion of the hand crank sleeve relative to the transmission shaft can be realized, the stop pawl sleeve is also provided with a stop pawl push rod which can rotate around the axis of the stop pawl sleeve, one end of the locking pawl push rod is in contact fit with the peripheral surface of the hand crank sleeve, the other end of the locking pawl push rod is in contact fit with the locking pawl, the part of the outer peripheral surface of the shaking sleeve, which is matched with the locking claw push rod, is provided with a conical surface, and through the reciprocating motion of the shaking sleeve, the locking pawl can be pushed to rotate, and then the locking pawl is pushed to be clamped inwards or the locking ratchet wheel is released outwards.

5. A self-locking jack as claimed in claim 1, wherein the first resilient member normally holds the holding pawl in a state of jamming against the holding ratchet.

6. The self-locking jack according to claim 4, wherein the second elastic component normally enables the shaking sleeve to cooperate with the locking pawl push rod to push the locking pawl to block the locking ratchet wheel, and when in use, the shaking sleeve is compressed towards the transmission shaft, so that the shaking sleeve and the locking pawl push rod are changed from conical surface contact to cylindrical surface contact, and the locking pawl push rod is further pushed to shift the locking pawl outwards, and the transmission of the jack is realized.

7. a self-locking jack as claimed in claim 1, wherein the pinion and the bull gear are bevel gears.

8. A self-locking jack as claimed in claim 1, wherein the locking ratchet and the bull gear are integrally formed.