CN212246052U - Jack for lifting battery frame - Google Patents

Abstract

The utility model relates to a jack for battery frame goes up and down. The problem of current jack as battery frame jacking equipment have load capacity not enough, bulky, transmission efficiency hangs down is solved. The lifting arm is movably connected between the upper mounting bracket and the lower mounting bracket; the lifting arm comprises an upper rotating arm and a lower rotating arm which are hinged with each other, the free end of the upper rotating arm is rotatably connected to the upper mounting bracket, and the free end of the lower rotating arm is rotatably connected to the lower mounting bracket; the screw mechanism comprises a screw, a motor connecting support and a screw nut, the connecting support and the screw nut are respectively arranged at the hinged positions of the upper rotating arm and the lower rotating arm of the pair of lifting arms, the first end of the screw is rotationally clamped on the motor connecting support, and the second end of the screw is in threaded connection with the screw nut; the motor is connected with the first end of the screw rod in a transmission way. The utility model discloses simple structure, it is small, light in weight, transmission efficiency is high, uses the good reliability.

Description

Jack for lifting battery frame

Technical Field

The utility model relates to a jack technical field especially relates to a jack for battery frame goes up and down.

Background

The vehicle-electricity separation and box-division electricity conversion mode is the development direction of new energy vehicles in the future. One mode of battery separation and replacement is realized by lifting a battery frame. The lifting battery frame is required to be lifted, a lifting mechanism is used, cost performance, reliability and stability are integrated in the lifting mechanism, and the mode of adopting an electric scissor type jack becomes the optimal choice. However, the electric scissor jack on the market suffers from several disadvantages: 1, insufficient load capacity: the traditional jack is mainly used for replacing tires of vehicles, depends on the function of the jack when in use, and generates the maximum force which is in an opening state; when the lifting mechanism is used for the electric vehicle lifting mechanism, the battery frame is lifted by the jack, and the required maximum force is the state when the jack is close to being combined. So, traditional jack will take place motor driving capability not enough, and support and lead screw are easy to take place to warp the scheduling problem. 2, larger volume: the motor reducer in the traditional electric jack adopts a gear transmission speed reduction scheme, so that the size of the electric jack is larger, and the electric jack cannot be used for an electric vehicle. 3, the transmission efficiency is lower: the traditional electric jack has the disadvantages of poor manufacturing precision, large frictional resistance between rotating mating parts and common material selection, and is used for an electric vehicle with larger useless power generated by the jack and correspondingly improving the load current of a motor.

Disclosure of Invention

The utility model discloses it is not enough, bulky, the low problem of transmission efficiency as battery frame jacking equipment to have mainly solved current jack, provides a jack for battery frame goes up and down.

The utility model provides a technical scheme that its technical problem adopted is: a jack for lifting a battery frame comprises

The lifting device comprises an upper mounting bracket and a lower mounting bracket, wherein a pair of lifting arms is connected between the upper mounting bracket and the lower mounting bracket;

the lifting arm comprises an upper rotating arm and a lower rotating arm which are hinged with each other, the free end of the upper rotating arm is rotatably connected to the upper mounting bracket, and the free end of the lower rotating arm is rotatably connected to the lower mounting bracket;

the screw mechanism comprises a screw, a motor connecting support and a screw nut, the motor connecting support and the screw nut are respectively arranged at the hinged positions of the upper rotating arm and the lower rotating arm of the pair of lifting arms, the first end of the screw is rotationally clamped on the motor connecting support, and the second end of the screw is in threaded connection with the screw nut;

and the motor is in transmission connection with the first end of the screw rod.

The utility model discloses a pair of lifing arm structure, every lifing arm include looks articulated upper and lower rocking arm, under screw mechanism's drive, upper and lower rocking arm is gone on and is extended from top to bottom or folds up and realize that the installing support reciprocates down mutually, and the battery frame is installed under on the installing support, has realized the battery frame oscilaltion promptly. The utility model discloses simple structure, it is small, light in weight, the convenient installation is on the electric motor car, uses the reliability high, has promoted user experience. The first end of the screw rod is rotatably connected to the motor connecting support, the upper rotating arm and the lower rotating arm on the first end side of the screw rod are hinged to the motor connecting support, the second end of the screw rod is connected with a screw rod nut in a threaded mode, and the upper rotating arm and the lower rotating arm on the second end side of the screw rod are hinged to the screw rod nut. The upper mounting bracket is fixed on the vehicle body, the lower mounting bracket is connected with the battery frame, when the screw rod is driven to rotate by the transmission of the motor, the screw rod nut axially moves on the screw rod, when the distance between the motor connecting bracket and the screw rod nut is shortened, the upper rotating arm and the lower rotating arm are erected, the upper mounting bracket is fixed, the lower mounting bracket moves downwards,

so that the battery frame is lowered. When the distance between the motor connecting support and the screw rod nut is lengthened, the upper rotating arm and the lower rotating arm are close and overlapped, and the lower mounting support moves upwards at the moment, so that the battery frame rises. The upper mounting bracket, the lower mounting bracket, the upper rotating arm and the lower rotating arm are made of aluminum alloy materials, so that the light weight of the whole vehicle is realized as far as possible under the condition that the requirements on rigidity and strength required by work are met. The screw rod and the screw nut adopt a combination mode of 45 steel and aluminum bronze, and have the advantages of good wear resistance, low friction coefficient, high reliability, lower cost and the like.

As a preferable scheme of the above scheme, the upper rotating arm and the lower rotating arm both comprise main body plates, wall plates are formed by bending on two sides of the main body plates, one end of each wall plate of the upper rotating arm extends forwards to form an upper rotating arm first hinge seat hinged with the upper mounting bracket, the other end of each wall plate of the upper rotating arm extends forwards to form an upper rotating arm second hinge seat, one end of each wall plate of the lower rotating arm extends forwards to form a lower rotating arm first hinge seat hinged with the lower mounting bracket, the other end of each wall plate of the lower rotating arm extends forwards to form a lower rotating arm second hinge seat, the upper rotating arm second hinge seat and the lower rotating arm second hinge seat on the same side are sleeved together and hinged on the motor connecting bracket, and the upper rotating arm second hinge seat and the lower rotating arm second hinge seat on the other side are sleeved together and hinged on the screw nut. Go up rocking arm and down the rocking arm in this scheme and constitute the cross-section by main part board and two wallboards and be the spill rectangular shape framework, extend at last rocking arm both ends wallboard and form the first articulated seat of rocking arm and the articulated seat of rocking arm second of going up respectively, it has the mounting hole to open on the wallboard of the first articulated seat of rocking arm and the articulated seat both sides of rocking arm second of going up, it has the mounting hole to open on the wallboard of the first articulated seat of rocking arm and the articulated seat both sides of rocking arm second down equally, it is provided with the round pin axle in the mounting hole of the first articulated seat of rocking arm and the articulated seat of rocking arm down to go up, articulate respectively in last installing support and lower. The upper rotating arm second hinge seat and the lower rotating arm second hinge seat are sleeved together, and the through holes are aligned to form a combined hinge seat.

As an optimal scheme of above-mentioned scheme, go up the installing support and include fixed plate and the vertical first curb plate that sets up in the fixed plate both sides, seted up respectively on first curb plate with two first connecting holes that go up the cantilever crane through round pin hub connection, seted up the fixed orifices on the fixed plate, the fixed plate is fixed on the automobile body through the installation bulb round pin, the installing support includes bottom plate and the vertical second curb plate that sets up in the bottom plate both sides down, set up respectively on the second curb plate with two second connecting holes that the cantilever crane passes through round pin hub connection. In the scheme, the upper mounting bracket and the lower mounting bracket are respectively used for being hinged with the upper rotating arm and the lower rotating arm to jointly form a lifting mechanism. The upper mounting bracket is fixed with the vehicle body, and the lower mounting bracket is fixed with the battery frame. When the battery frame works, the upper mounting bracket is fixed, the upper rotating arm and the lower rotating arm extend and approach under the action of the screw rod, and the lower mounting bracket moves downwards and upwards to drive the battery frame to descend and ascend. The upper mounting bracket and the lower mounting bracket are both of concave structures, and the ends of the upper rotating arm and the lower rotating arm are embedded into the concave structures and are respectively hinged with the upper mounting bracket and the lower mounting bracket.

As a preferable scheme of the above scheme, the motor connecting support is cylindrical, the first end of the screw shaft is inserted into the motor connecting support, the end of the first end of the screw shaft is connected to the front end of the motor connecting support through a first bearing, a first copper oil-containing bushing is arranged between the inside of the motor connecting support and the screw shaft, first threaded holes are respectively formed in the outer walls of two sides of the motor connecting support, and the upper rotating arm and the lower rotating arm are connected to the first threaded holes through bolts. The combination hinge seat mounting hole of one side lift arm aligns first screw hole, and the bolt passes rocking arm and lower rocking arm, and specific for the bolt passes and connects in first screw hole behind the articulated seat of rocking arm second, the articulated seat of lower rocking arm second, will go up the articulated seat of rocking arm second, the articulated seat rotation of lower rocking arm second connects on motor linking bridge. The lead screw passes through first bearing and connects in the motor linking bridge, and the lead screw rotates more smoothly, has improved transmission efficiency, sets up first copper oiliness bush in addition between lead screw and motor linking bridge, reduces coefficient of friction and has good wearability.

As a preferable scheme of the above scheme, second threaded holes are respectively formed in outer walls of two sides of the feed screw nut, and the upper rotating arm and the lower rotating arm are connected to the second threaded holes through bolts. The combined hinged base mounting hole of the lifting arm on the other side is aligned to the threaded hole, the bolt penetrates through the upper rotating arm and the lower rotating arm, the bolt penetrates through the second hinged base of the upper rotating arm and the second hinged base of the lower rotating arm and then is connected into the second threaded hole, and the second hinged base of the lower rotating arm are rotatably connected onto the lead screw nut. The connecting bolt moves on the screw rod, when the connecting bolt approaches the motor connecting support, the upper rotating arm and the lower rotating arm are erected, the battery frame descends, and when the connecting bolt moves away from the motor connecting support, the upper rotating arm and the lower rotating arm are folded, and the battery frame ascends.

As a preferable scheme of the above scheme, the front ends of the two side walls of the first hinge seats of the upper rotating arm and the first hinge seats of the lower rotating arm are respectively provided with gear teeth, wherein the first hinge seats of the two upper rotating arms are meshed with each other, and the first hinge seats of the two lower rotating arms are meshed with each other.

The gear teeth are arranged at the front ends of the side walls of the two sides of the first hinged seat of the upper rotating arm and the first hinged seat of the lower rotating arm, the gear teeth of the first hinged seats of the two upper rotating arms are meshed when the first hinged seats of the two upper rotating arms are hinged in the upper mounting support, and the gear teeth of the first hinged seats of the two lower rotating arms are meshed when the first hinged seats of the two lower rotating arms are hinged in the lower mounting support. Therefore, the two upper rotating arms and the two lower rotating arms form linkage respectively, and are driven by the gear teeth during rotation to realize synchronous rotation, so that the upper rotating arms and the lower rotating arms are smoother and more stable during extension and folding.

As a preferable scheme of the above scheme, a telescopic sheath is sleeved on the screw rod, one end of the sheath is fixed on the motor connecting bracket, and the other end of the sheath is fixed on the screw rod nut. The utility model provides an increase the sheath on the lead screw in this scheme, scalability through the sheath has realized the protection to the lead screw under the jack position, prevents that muddy water, gravel are direct to cause the destruction to the lead screw in the electric motor car traveles, has protected the lead screw, has increased life.

As an optimized scheme of the above scheme, the motor is connected with the speed reducer, the speed reducer is fixed with the motor connecting support, the end face of the first end of the screw rod is provided with a spline groove, an output shaft of the speed reducer is matched with the spline groove, and the speed reducer is a worm gear structure speed reducer. In the scheme, the motor is in transmission connection with the screw rod through the speed reducer, the motor and the speed reducer are in gear transmission, and the speed reducer and the screw rod are in spline transmission. The end face spline groove of the screw rod is of an inner hexagonal structure, the output shaft of the speed reducer is of a hexagonal structure, and the output shaft of the speed reducer is inserted into the spline groove to form transmission fit. The speed reducer adopts a worm gear as a transmission mode, so that transmission with a large reduction ratio and small occupied volume are realized.

As a preferred scheme of the above scheme, the motor connecting support comprises a first sheath motor connecting support arranged on a wire winding rod, a second sheath motor connecting support arranged on a wire winding rod on a screw rod nut, and two ends of the sheath are respectively fixed on the first sheath motor connecting support and the second sheath motor connecting support. Set up first sheath motor linking bridge and second sheath motor linking bridge in this scheme and can make things convenient for the installation of sheath. The first sheath motor connecting support and the second sheath motor connecting support are both threaded on the screw rod. Wherein this scheme is for simplifying the structure, and first sheath linking bridge and motor are connected and are closed as an organic whole, and second sheath linking bridge is a working of plastics spiro union on screw-nut.

As a preferable scheme of the above scheme, through holes for hinging are respectively arranged on the first hinge base of the upper rotating arm, the second hinge base of the upper rotating arm, the first hinge base of the lower rotating arm and the second hinge base of the lower rotating arm, second copper oil-containing bushings are respectively arranged in the through holes of the first hinge base of the upper rotating arm and the first hinge base of the lower rotating arm, and third copper oil-containing bushings are respectively arranged in the through holes of the second hinge base of the upper rotating arm and the second hinge base of the lower rotating arm. This scheme is articulated through round pin axle and the articulated first articulated seat of the first articulated seat of upper boom and lower boom respectively at last installing support and lower installing support, it is articulated through the pin bolt with the articulated seat of lower boom second to rotate the articulated seat of upper boom second, all be provided with second copper oiliness bush 34 in the through-hole of the first articulated seat of upper boom and lower boom, all be provided with third copper oiliness bush in the through-hole of the articulated seat of upper boom second and lower boom second, make the mechanism at the during operation, only take place to rotate between round pin axle and the copper oiliness bush, according to the bush characteristic, but the running friction can be reduced when upper boom and lower boom rotate, reduce the body wearing and tearing, transmission efficiency is improved.

The utility model has the advantages that:

1. adopt a pair of lifing arm structure, every lifing arm is including looks articulated upper and lower rocking arm, under screw mechanism's drive, upper and lower rocking arm is extended or is foldd and realize that installing support reciprocates down to drive the battery frame and carry out the oscilaltion, simple structure, it is small, light in weight, the convenient installation is on the electric motor car, uses the reliability height, has promoted user experience.

2. The lead screw passes through first bearing and connects in the motor linking bridge, and the lead screw rotates more smoothly, has improved transmission efficiency, sets up first copper in addition between lead screw and motor linking bridge and contains the bush, reduces coefficient of friction and has good wearability.

3. Go up the articulated seat of rocking arm first, go up the articulated seat of rocking arm second, the articulated seat of rocking arm first, all be provided with the oily bush of second copper in the through-hole of the articulated seat of rocking arm second down for only take place to rotate between round pin axle and the oily bush of second copper when going up rocking arm and rocking arm rotation down, reduce the rotational friction, reduce body wearing and tearing, improve transmission efficiency.

Drawings

Fig. 1 is an exploded view of a structure of the present invention;

fig. 2 is a schematic sectional view of the present invention;

fig. 3 is a schematic structural view of an upper and lower rotating arm of the present invention;

fig. 4 is a schematic structural view of the middle lower boom of the present invention.

1-upper mounting bracket 2-lower mounting bracket 3-upper rotating arm 4-lower rotating arm 5-lead screw 6-motor connecting bracket 7-lead screw nut 8-motor 9-main body plate 10-wall plate 11-fixed plate 12-first side plate 13-first connecting hole 14-fixed hole 15-bottom plate 16-second side plate 17-second connecting hole 18-first bearing 19-first copper oil-containing bush 20-first threaded hole 21-second threaded hole 22-upper rotating arm first hinge seat 23-upper rotating arm second hinge seat 24-lower rotating arm first hinge seat 25-lower rotating arm second hinge seat 26-gear tooth 27-sheath 28-speed reducer 29-spline groove 30-first sheath motor connecting bracket 31- The second sheath motor connecting bracket 32, the second bearing 33, the through hole 34, the second copper oil-containing bushing 35 and the third copper oil-containing bushing.

The specific implementation mode is as follows:

the technical solution of the present invention is further described below by way of examples and with reference to the accompanying drawings.

Example (b):

the jack for lifting the battery frame of the embodiment comprises an upper mounting bracket 1, a lower mounting bracket 2, a lifting arm, a screw rod mechanism and a motor 8, as shown in fig. 1. The lifting arm is provided with a pair of lifting arms which are movably connected between the upper mounting bracket and the lower mounting bracket. The lifting arm comprises an upper rotating arm 3 and a lower rotating arm 4 which are hinged with each other, the free ends of the two upper rotating arms are hinged on the upper mounting bracket, and the free ends of the two lower rotating arms are hinged on the lower mounting bracket. The screw mechanism comprises a screw 5, a motor connecting support 6 and a screw nut 7, the motor connecting support is arranged at the hinged position of an upper rotating arm and a lower rotating arm of one lifting arm, the screw nut is arranged at the hinged position of the upper rotating arm and the lower rotating arm of the other lifting arm, the screw comprises a first end and a second end, the first end of the screw is rotatably arranged on the motor connecting support, and the second end of the screw is in threaded connection with the screw nut. The motor 8 is connected to the motor connecting support through a speed reducer, and the speed reducer is connected with the first end of the screw rod in a transmission mode.

The upper mounting bracket comprises a fixing plate 11 and a first side plate 12 vertically arranged on two sides of the fixing plate, the fixing plate is integrally concave, fixing holes 14 are formed in the fixing plate, and the upper mounting bracket is screwed on the vehicle body by installing ball pins on the fixing holes. All be provided with two and two first connecting hole 13 that go up the cantilever and pass through the round pin hub connection on two first curb plates.

The lower mounting bracket comprises a bottom plate 15 and second side plates 16 vertically arranged on two sides of the bottom plate, the whole lower mounting bracket also forms a concave shape, the bottom plate is longer than a fixing plate of the upper mounting bracket, the second side plates are in an isosceles trapezoid shape, mounting holes are formed in two ends of the bottom plate, the lower mounting bracket is connected with a battery frame through bolts, and the battery frame is fixed on the lower mounting bracket. Two second connecting holes 17 connected with the lower rotating arms through pin shafts are arranged on the two second side plates.

As shown in fig. 3 and 4, each of the upper and lower swing arms 3 and 4 includes a main body plate 9 and a wall plate 10 formed by bending both sides of the main body plate, and integrally forms a concave elongated frame. Two wallboards of one end of the upper rotating arm extend outwards to form a first hinged seat 22 of the upper rotating arm hinged with the upper mounting bracket on the end, and two wallboards of the other end of the upper rotating arm extend outwards to form a second hinged seat 23 of the upper rotating arm hinged with the lower rotating arm on the end. Two wall plates at one end of the lower rotating arm extend outwards to form a first lower-arm hinging seat 24 hinged with the lower mounting bracket on the end, and two wall plates at the other end of the lower rotating arm extend outwards to form a second lower-arm hinging seat 25 hinged with the upper rotating arm on the end. Through holes are formed in two side walls of the first hinged seat of the upper rotating arm, the second hinged seat of the upper rotating arm, the first hinged seat of the lower rotating arm and the second hinged seat of the lower rotating arm.

Go up the articulated seat of rocking arm first, go up the articulated seat of rocking arm second, the first articulated seat of rocking arm down, all set up articulated through-hole 33 of usefulness on the articulated seat of rocking arm second down, all be provided with second copper oil-containing bush 34 in the through-hole, go up the first articulated seat of rocking arm, the first articulated seat department of rocking arm down, go up the round pin axle both ends and pass first connecting hole on the first curb plate of last installing support and go up the articulated realization of riveting through revolving behind the second copper oil-containing bush in the first articulated seat through-hole of rocking arm respectively and hinge the technology realization articulated. And two ends of the lower pin shaft respectively penetrate through a second connecting hole in the second side plate of the lower mounting plate and a second copper oil-containing bushing in a through hole of the second hinge base of the lower rotating arm and then are fixed in a threaded manner. In addition, in order to make the upper and lower rotating arms rotate together more smoothly and stably, as shown in fig. 2, the front ends of the two side walls of the first hinge seat 22 of the upper rotating arm and the first hinge seat 24 of the lower rotating arm are respectively provided with gear teeth 26, the gear teeth of the first hinge seats of the two upper rotating arms are engaged, and the gear teeth of the first hinge seats of the two lower rotating arms are engaged.

The upper rotating arm second hinge base is matched with the lower rotating arm second hinge base, one pair of the upper rotating arm second hinge bases and the lower rotating arm second hinge bases are hinged to the motor connecting support together, and the other pair of the upper rotating arm second hinge bases and the lower rotating arm second hinge bases are hinged to the screw nut together.

As shown in fig. 1 and 2, the motor connecting support has a 6-bit cylindrical shape, two side walls of the motor connecting support are respectively provided with a first threaded hole 20, and a bolt passes through the upper rotating arm second hinge seat and the lower rotating arm second hinge seat and then is connected in the first threaded hole, so that the upper rotating arm second hinge seat and the lower rotating arm second hinge seat are rotatably connected to the motor connecting support. The first end of lead screw inserts in motor linking bridge, and the end of the first end of lead screw passes through first bearing 18 to be connected on motor linking bridge's front end, and it is more smooth and easy for the lead screw to rotate, improves transmission efficiency, still is provided with bush 19 with lead screw support in motor linking bridge, and this bush contains the bush for the copper, can reduce coefficient of friction and have good wearability.

And second threaded holes 21 are respectively formed in two side walls of the screw nut 7, the bolt penetrates through the upper rotating arm second hinge seat and the lower rotating arm second hinge seat and then is connected into the second threaded hole, and the upper rotating arm second hinge seat and the lower rotating arm second hinge seat are rotatably connected onto the screw nut.

In order to protect the screw rod and prevent muddy water and gravel in the running process of the electric vehicle from directly damaging the screw rod, a telescopic protective sleeve 27 is sleeved on the screw rod. A first sheath motor connecting support 30 is integrally formed at one end, facing the screw nut, of the motor connecting support 6, a second sheath motor connecting support 31 is connected to one end, facing the motor connecting support, of the screw nut 7 through a winding screw, and two ends of a sheath are fixed to the first sheath motor connecting support and the second sheath motor connecting support through binding belts respectively.

The reducer adopts a worm gear structure, the motor is fixed on the reducer, the output shaft of the motor and the input end of the reducer are fixed by bolts, and the reducer is in a gear transmission connection mode; the reducer is in threaded connection with the motor connecting support, a spline groove 29 is formed in the end face of the first end of the screw rod, and an output shaft of the reducer is inserted into the spline groove to achieve transmission between the reducer and the screw shaft.

In the embodiment, the upper mounting bracket, the lower mounting bracket, the upper rotating arm and the lower rotating arm are made of aluminum alloy materials, so that the requirement of rigidity and strength required by work is met, and the light weight of the whole vehicle is realized as far as possible. The screw rod nut is made of aluminum bronze, has good wear resistance and low friction coefficient, and is not easy to deform. The screw rod is made of 45# material, the diameter of the screw rod is increased to 18mm, and the screw pitch is increased by 3 mm. The screw rod is not easy to deform. Meanwhile, the combination mode of the screw rod and the screw rod nut has the advantages of good wear resistance, low friction coefficient, high reliability, lower cost and the like.

Under the normal use state of the vehicle, the screw rod nut is positioned at the outermost end of the second end of the screw rod, the distance between the motor connecting support and the screw rod nut is the largest, and the upper rotating arm and the lower rotating arm are in a folded state, namely the battery frame rises and is positioned at the bottom of the electric vehicle. When the battery is to be replaced, the screw rod is driven to rotate through the motor, the screw rod nut moves towards the side of the motor connecting support on the screw rod, the upper rotating arm and the lower rotating arm are driven to extend in the vertical direction, the lower mounting support moves downwards, the battery frame is lowered, the power battery is exposed, and a user can conveniently replace the battery.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Although the terms upper mounting bracket, lower mounting bracket, upper swivel arm, lower swivel arm, etc. are used more herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.

Claims (10)

1. A jack for battery frame goes up and down which characterized in that: comprises that

The device comprises an upper mounting bracket (1) and a lower mounting bracket (2), wherein a pair of lifting arms are connected between the upper mounting bracket and the lower mounting bracket;

the lifting arm comprises an upper rotating arm (3) and a lower rotating arm (4) which are hinged with each other, the free end of the upper rotating arm is rotatably connected to the upper mounting bracket, and the free end of the lower transmission arm is rotatably connected to the lower mounting bracket;

the screw mechanism comprises a screw (5), a motor connecting support (6) and a screw nut (7), the motor connecting support and the screw nut are respectively arranged at the hinged positions of the upper rotating arm and the lower rotating arm of the pair of lifting arms, the first end of the screw is rotationally clamped on the motor connecting support, and the second end of the screw is in threaded connection with the screw nut;

and the motor (8) is in transmission connection with the first end of the screw rod.

2. The jack for lifting a battery frame as claimed in claim 1, wherein the upper and lower pivoted arms (3, 4) each comprise a main body plate (9) bent at both sides to form wall plates (10), one end of each wall plate of the upper pivoted arm extending forward to form a first hinged seat (22) of the upper pivoted arm hinged to the upper mounting bracket (1), the other end of each wall plate of the upper pivoted arm extending forward to form a second hinged seat (23) of the upper pivoted arm, one end of each wall plate of the lower pivoted arm extending forward to form a first hinged seat (24) of the lower pivoted arm hinged to the lower mounting bracket (2), and the other end of each wall plate of the lower pivoted arm extending forward to form a second hinged seat (25) of the lower pivoted arm, wherein the second hinged seats of the upper pivoted arm and the second hinged seats of the lower pivoted arm on the same side are nested together and hinged to the motor connecting bracket (6), and the second hinged seats of the upper pivoted arm and the lower pivoted seat on the other side are nested together and hinged to a nut of the lead screw rod (7) The above.

3. The jack for lifting a battery frame as claimed in claim 2, wherein the upper mounting bracket (1) comprises a fixing plate (11) and a first side plate (12) vertically arranged at both sides of the fixing plate, the first side plate is provided with first connecting holes (13) respectively connected with the two upper rotating arms through pin shafts, the fixing plate is provided with fixing holes (14), the fixing plate is fixed on the vehicle body through mounting ball pins, the lower mounting bracket (2) comprises a bottom plate (15) and second side plates (16) vertically arranged at both sides of the bottom plate, and the second side plates are provided with second connecting holes (17) respectively connected with the two lower rotating arms through pin shafts.

4. The jack for lifting the battery frame as claimed in claim 1, wherein the motor connecting bracket (6) is cylindrical, the first end of the screw rod is inserted into the motor connecting bracket, the end of the first end of the screw rod is connected to the front end of the motor connecting bracket through a first bearing (18), a first copper oil-containing bushing (19) is arranged between the motor connecting bracket and the screw rod, first threaded holes (20) are respectively arranged on the outer walls of the two sides of the motor connecting bracket, and the upper rotating arm (3) and the lower rotating arm (4) are connected to the first threaded holes through bolts.

5. The jack for lifting the battery frame as claimed in claim 4, wherein the outer walls of both sides of the feed screw nut (7) are respectively provided with a second threaded hole (21), and the upper rotating arm (3) and the lower rotating arm (4) are connected to the second threaded holes through bolts.

6. The jack for lifting a battery frame as claimed in claim 2, wherein the first hinge seats (22) of the upper swivel arms and the first hinge seats (24) of the lower swivel arms are provided at the front ends of both side walls with gear teeth (26), respectively, wherein the first hinge seats of the upper swivel arms are engaged with each other, and the first hinge seats of the lower swivel arms are engaged with each other.

7. The jack for lifting the battery frame as claimed in claim 5, wherein a telescopic sheath (27) is sleeved on the screw rod (5), one end of the sheath is fixed on the motor connecting bracket, and the other end of the sheath is fixed on the screw rod nut.

8. The jack for lifting the battery frame as claimed in claim 1, 2 or 3, wherein the output shaft of the motor (8) is connected with a speed reducer (28), the speed reducer is fixed with the motor connecting bracket (6), the end surface of the first end of the screw rod is provided with a spline groove (29), the output shaft of the speed reducer is in transmission fit with the spline groove, and the speed reducer is a worm gear structure speed reducer.

9. The jack for lifting the battery frame as claimed in claim 5, wherein the motor connecting bracket (6) comprises a first sheath motor connecting bracket (30) arranged on the wire winding rod, a second sheath motor connecting bracket (31) arranged on the wire winding rod on the screw nut (7), and two ends of the sheath are respectively fixed on the first sheath motor connecting bracket and the second sheath motor connecting bracket.

10. The jack for lifting the battery frame as claimed in claim 2 or 3, wherein the first hinge base of the upper rotating arm, the second hinge base of the upper rotating arm, the first hinge base of the lower rotating arm and the second hinge base of the lower rotating arm are all provided with through holes (33) for hinging, the first hinge base of the upper rotating arm and the first hinge base of the lower rotating arm are both provided with second copper oil-containing bushings (34), and the second hinge base of the upper rotating arm and the second hinge base of the lower rotating arm are both provided with third copper oil-containing bushings (35).

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