CN216636106U

CN216636106U - Lifting vertical frame for electric tarpaulin machine

Info

Publication number: CN216636106U
Application number: CN202220221355.3U
Authority: CN
Inventors: 陶洪涛
Original assignee: Tangshan Pengcheng Outdoor Articles Co ltd
Current assignee: Tangshan Pengcheng Outdoor Articles Co ltd
Priority date: 2022-01-26
Filing date: 2022-01-26
Publication date: 2022-05-31
Anticipated expiration: 2032-01-26

Abstract

The application relates to the technical field of electric tarpaulin machines, and discloses a lifting vertical frame for an electric tarpaulin machine, which solves the problem that when a related lifting column rises or falls along a lifting leg, a driving motor continuously drives a screw rod to rotate, so that the lifting distance cannot be effectively regulated and controlled, and a supporting frame is easily damaged, and comprises the lifting column which rises and falls along the inner side wall of a sleeve, wherein one side of the lifting column, which is far away from the sleeve, is provided with a threaded rod, one end of the lifting column, which is close to the ground, is coaxially fixed with a movable nut, the movable nut is in threaded connection with the threaded rod, one end of the threaded rod extends out of the sleeve and is connected with the driving motor, the cross sections of the lifting column and the sleeve are rectangular, the middle section of the threaded rod is provided with a threaded part which is meshed with the movable nut, one end of the threaded rod, which is close to the ground, is provided with a first limiting mechanism for limiting the descending lifting column, and one end of the threaded rod, which is far away from the ground, is provided with a second limiting mechanism for limiting the ascending lifting column, thereby reducing the occurrence of damage to the lifting stand.

Description

Lifting vertical frame for electric tarpaulin machine

Technical Field

The application relates to the technical field of electric tarpaulin machines, in particular to a lifting vertical frame for an electric tarpaulin machine.

Background

When a truck transports bulk goods, in order to reduce the falling of the bulk goods, the top of a truck hopper is usually covered with tarpaulin, and an electric tarpaulin machine can automatically wind the tarpaulin under the driving of a motor, so that the tarpaulin can be conveniently wound and the labor is saved; the lifting vertical frame for the electric tarpaulin machine is used for adjusting the covering position of the tarpaulin.

At present, a lifting stand for a related electric tarpaulin machine, such as a Chinese patent 'tarpaulin traction device and a truck environmental protection tarpaulin automatic retraction device' with an authorization publication number of CN209972292U, discloses a front support frame and a rear support frame, wherein the front support frame and the rear support frame have the same structure and are both lifting support frames, the rear support frame comprises a first lifting leg and a second lifting leg which are parallel to each other, two ends of a cross rod are respectively and fixedly connected with the first lifting leg and the second lifting leg, the cross rod is in an arch shape with two low ends and a high middle part, the first lifting leg and the second lifting leg of the rear support frame and the first lifting leg and the second lifting leg of the front support frame of the rear support frame are respectively arranged at four corners of the inner side of a carriage; the first lifting leg and the second lifting leg are identical in structure and comprise a first driving motor and a lifting column, a rectangular sleeve is sleeved outside the lifting column, a lead screw moving nut is fixedly arranged in the lifting column, a lead screw is connected to the lead screw moving nut in a threaded mode, a power output shaft of the first driving motor is in power connection with the lead screw through a universal joint, and the rectangular sleeve and the first driving motor are fixed on the inner wall of the carriage. The screw rod is driven to the driving motor and is rotated, and the screw rod that the lead screw and lift post internal fixation set up removes the nut cooperation, and one positive biography of driving motor can make the lift post rise along lift leg one, and a driving motor reversal can make the lift post descend along lift leg to the realization is adjusted the cover height of tarpaulin.

When the lifting column ascends or descends along the lifting leg, the driving motor continuously drives the screw rod to rotate, so that the lifting distance cannot be effectively regulated and controlled, and the supporting frame can be easily damaged.

SUMMERY OF THE UTILITY MODEL

In order to reduce the condition that damages appear in the support frame because the lift distance can not effectively be regulated and control when going up and down, this application provides an electric tarpaulin machine lift grudging post.

The application provides a pair of electric tarpaulin machine lift grudging post adopts following technical scheme:

the utility model provides an electric tarpaulin machine lift grudging post, includes the lift post along the internal wall oscilaltion of sleeve pipe, the lift post is kept away from sheathed tube one side and is equipped with the threaded rod, the coaxial removal nut that is fixed with of one end that the lift post is close to ground, removal nut and threaded rod threaded connection, just the one end of threaded rod stretches out the sleeve pipe and is connected with driving motor, lift post and sheathed tube cross section are the rectangle, the middle section of threaded rod is equipped with the screw portion with removal nut meshing, the threaded rod is close to ground one end and installs and carry out spacing first stop gear to the lift post that descends, the threaded rod is kept away from ground one end and is installed and carry out spacing second stop gear to the lift post that rises.

By adopting the technical scheme, when the driving motor drives the threaded rod to rotate forwards or reversely, the lifting column and the sleeve pipe which are connected with the threaded rod through the movable nut and have rectangular cross sections cannot rotate relatively, so that the lifting column can ascend or descend along the threaded rod, and the effect that the lifting column stretches out of the sleeve pipe or retracts into the sleeve pipe is further realized; first stop gear and second stop gear set up respectively at the upper and lower both ends of threaded rod, and when the lift post removed the lower extreme of threaded rod, the removal nut broke away from screw portion and made the threaded rod take place idle running, and was difficult for making the lift post continue to remove and damages the sleeve pipe, and when the lift post removed the upper end of threaded rod, the removal nut broke away from screw portion, made the difficult continuation rebound of lift post to effectual control the lift distance of lift post, reduced the condition that the damage appears in the lift grudging post.

Optionally, the threaded rod still includes glossy connecting portion, connecting portion are located the threaded rod and are close to the one end on ground, coaxial fixed ring that is fixed with on the connecting portion, the fixed slot that supplies solid fixed ring grafting is seted up to the sleeve pipe inside wall, solid fixed ring is fixed with the fixed slot looks gomphosis, gu one side butt that fixed ring is close to screw thread portion has the butt spring, the butt spring housing is in the outside of connecting portion.

By adopting the technical scheme, when the movable nut fixed with the lifting column descends onto the connecting part along the threaded rod, the movable nut slides into the connecting part to keep the threaded rod in an idle running state under the condition that the rotating direction driven by the driving motor is not changed, so that the damage of the lifting vertical frame is reduced; when the drive motor drives the threaded rod to rotate reversely, the movable nut is meshed with the threaded part under the pushing of the abutting spring, so that the lifting column moves upwards.

Optionally, one side of the abutting spring, which is close to the threaded portion, is provided with a first thrust ball bearing, the first thrust ball bearing is coaxially sleeved outside the connecting portion, and one side of the first thrust ball bearing, which is far away from the abutting spring, is abutted to one side of the moving nut, which is far away from the lifting column.

Through adopting above-mentioned technical scheme, first thrust ball bearing installs in the one side that the butt spring is close to screw thread portion, and when the lift post descends, the removal nut can with first thrust ball bearing looks butt, first thrust ball bearing can reduce the frictional force between removal nut and the butt spring.

Optionally, the one end that the sleeve pipe is close to ground is fixed with the shrouding, the shrouding is kept away from sheathed tube one side and is still installed the apron, connecting portion run through the apron and are connected with driving motor, just through the bolt fastening between shrouding and the apron, first stop gear still includes tapered roller bearing, tapered roller bearing is located solid fixed ring and keeps away from one side of butt spring, tapered roller bearing keeps away from solid fixed ring one side and apron butt.

Through adopting above-mentioned technical scheme, tapered roller bearing further plays the effect of supporting the threaded rod when, can also reduce the frictional force between threaded rod and the sleeve pipe.

Optionally, the threaded rod still includes the extension, the extension is located the one end that the connecting portion were kept away from to the threaded rod, second stop gear installs on the extension, second stop gear includes the second thrust ball bearing who installs the one end looks butt of removal nut with the lift post, one side butt that screw portion was kept away from to second thrust ball bearing has back pressure spring, one side butt that second thrust ball bearing was kept away from to back pressure spring has the mounting panel, one side butt that back pressure spring was kept away from to the mounting panel has mounting nut, mounting nut is fixed with extension threaded connection.

By adopting the technical scheme, the mounting nut is fixedly connected with the extending part through the threads, so that the situation that the second limiting mechanism is separated from the threaded rod from the extending part is reduced, the mounting nut in threaded connection is convenient to disassemble, and the mounting nut is convenient to disassemble and replace when the back pressure spring is damaged after long-term use; when the movable nut moves to the end, far away from the connecting portion, of the threaded portion, the movable nut is separated from the threaded portion, the movable nut can be abutted to the second thrust ball bearing, the second ball bearing reduces the influence of rotation of the threaded rod on the lifting column, the threaded rod continues to keep rotating and is in an idle running state at the moment, when the threaded rod rotates in the reverse direction, the return pressure spring pushes the movable nut to move downwards, the movable nut and the nut portion can be meshed again, the lifting column is guaranteed to descend, the second limiting mechanism can enable the lifting column to move upwards to a certain distance and then cannot move continuously, and therefore the damage of the lifting stand is reduced.

Optionally, the threaded rod further comprises an extension part, the extension part is coaxially installed between the extension part and the threaded part, and the diameter of the extension part is larger than that of the extension part and smaller than that of the threaded part.

Through adopting above-mentioned technical scheme, on the removal breaks away from screw thread portion and moves the extension under the rotation of threaded rod as the displacement nut to with second thrust ball bearing butt, because the diameter of extension is greater than the extension, make second thrust ball bearing blocked on the extension, when displacement nut downstream, second thrust ball bearing can not the lapse, the extension plays and carries out spacing effect to second stop gear.

Optionally, a washer is further installed between the mounting nut and the mounting plate.

Through adopting above-mentioned technical scheme, the packing ring can increase the area of contact between mounting nut and the mounting panel, reduces the butt pressure of mounting nut to the mounting panel, reduces the condition that mounting nut takes place to become flexible simultaneously.

Optionally, a universal joint is further connected between the threaded rod and the driving motor.

Through adopting above-mentioned technical scheme, the universal joint plays the effect that changes transmission axis direction, and the threaded rod probably has rocking of small range at the rotation in-process, and the universal joint plays protection driving motor's effect.

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

1. when the driving motor drives the threaded rod to rotate forward or reversely, the lifting column and the sleeve are not relatively rotated due to the fact that the movable nut is in threaded connection with the threaded rod and the rectangular cross section of the lifting column and the sleeve do not rotate, the lifting column can ascend or descend along the threaded rod, and the effect that the lifting column stretches out of the sleeve or retracts into the sleeve is further achieved; the first limiting mechanism and the second limiting mechanism are respectively arranged at the upper end and the lower end of the threaded rod, when the lifting column moves to the lower end of the threaded rod, the nut is moved to be separated from the threaded rod to enable the threaded rod to idle, the lifting column is not easy to move continuously to damage the sleeve, and when the lifting column moves to the upper end of the threaded rod, the nut is moved to be separated from the threaded rod to enable the lifting column to be difficult to move continuously upwards, so that the lifting distance of the lifting column is effectively controlled, and the damage of the lifting stand is reduced;

2. when the movable nut fixed with the lifting column descends onto the connecting part along the threaded rod, the movable nut slides into the connecting part to keep the threaded rod in an idle running state under the condition that the rotating direction driven by the driving motor is not changed, so that the damage of the lifting vertical frame is reduced; when the driving motor drives the threaded rod to rotate reversely, the movable nut is meshed with the threaded part under the pushing of the abutting spring, so that the lifting column moves upwards;

3. the mounting nut is fixedly connected with the extending part through threads, so that the situation that the second limiting mechanism is separated from the threaded rod from the extending part is reduced, the mounting nut in threaded connection is convenient to disassemble, and the mounting nut is convenient to disassemble and replace when the back pressure spring is damaged after long-term use; when the movable nut moves to the end, far away from the connecting portion, of the threaded portion, the movable nut is separated from the threaded portion, the movable nut can be abutted to the second thrust ball bearing, the second ball bearing reduces the influence of rotation of the threaded rod on the lifting column, the threaded rod continues to keep rotating and is in an idle running state at the moment, when the threaded rod rotates in the reverse direction, the return pressure spring pushes the movable nut to move downwards, the movable nut and the nut portion can be meshed again, the lifting column is guaranteed to descend, the second limiting mechanism can enable the lifting column to move upwards to a certain distance and then cannot move continuously, and therefore the damage of the lifting stand is reduced.

Drawings

Fig. 1 is a first structural schematic diagram of a lifting stand.

Fig. 2 is a partially enlarged view of the first stopper mechanism at a in fig. 1.

Fig. 3 is a schematic structural view of the lifting stand.

Fig. 4 is a partial enlarged view of the second stopper mechanism at B in fig. 3.

Description of reference numerals: 1. a lifting column; 11. moving the nut; 12. a plug-in part; 2. a sleeve; 21. closing the plate; 211. A clamping groove; 22. a cover plate; 221. fixing grooves; 3. a frame body; 4. a plug rod; 41. a cross beam; 5. a threaded rod; 51. a threaded portion; 52. a connecting portion; 53. a protruding portion; 54. an extension portion; 6. a drive motor; 61. a universal joint; 7. a first limit mechanism; 71. a first thrust ball bearing; 72. an abutment spring; 73. a fixing ring; 74. a tapered roller bearing; 8. a second limiting mechanism; 81. a second thrust ball bearing; 82. a back pressure spring; 83. mounting a plate; 84. mounting a nut; 85. a gasket.

Detailed Description

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

The embodiment of the application discloses electric tarpaulin machine lift grudging post.

Referring to fig. 1, a lifting stand for an electric tarpaulin machine includes four lifting columns 1 installed below the tarpaulin, the four lifting columns 1 are respectively located at four end corners of the tarpaulin, a sleeve 2 is arranged below each lifting column 1, and the lifting columns 1 can ascend and descend along the height direction of the sleeve 2, so as to achieve the effect of adjusting the position height of the tarpaulin.

The lift grudging post is still including the support body 3 that is used for vertical fixed sleeve 2, and the one end that ground was kept away from to lift post 1 is coaxial to be equipped with grafting portion 12, and the width of grafting portion 12 is greater than the width of lift post 1, all pegs graft in grafting portion 12 and have peg graft pole 4, all is fixed with crossbeam 41 between every two adjacent peg poles 4, and the upside at crossbeam 41 is fixed in the tarpaulin horizontal covering, and peg pole 4 is vertical to be inserted in grafting portion 12, makes the tarpaulin can be along with 1 oscilaltion of lift post.

Referring to fig. 1 and 2, the lifting column 1 is inserted inside the casing 2, the cross sections of the lifting column 1 and the casing 2 are rectangular, a threaded rod 5 is vertically inserted in the casing 2, the threaded rod 5 is located on one side of the lifting column 1 away from the casing 2, the threaded rod 5 comprises a threaded portion 51 and a smooth connecting portion 52, the threaded portion 51 is located in the middle section of the threaded rod 5, the connecting portion 52 is located on one side of the threaded rod 5 close to the ground, the connecting portion 52 extends out of the casing 2 and is provided with a driving motor 6, the driving motor 6 is used for driving the threaded rod 5 to rotate, the driving motor 6 is fixed on the frame body 3, and the driving motor 6 is located below the casing 2.

The one end that the lift post 1 is close to ground still coaxial fixed with removes nut 11, and the meshing between removal nut 11 and the threaded rod 5 mutually, when driving motor 6 drive threaded rod 5 forward or during the antiport, the cross section is the lift post 1 and the sleeve pipe 2 of rectangle, makes lift post 1 can not take place rotatoryly in sleeve pipe 2 for the removal nut 11 with the meshing of threaded rod 5 can reciprocate along threaded rod 5, thereby realizes the oscilaltion of lift post 1.

Still be connected with universal joint 61 between driving motor 6 and the connecting portion 52, when driving motor 6 drive threaded rod 5 rotated, threaded rod 5 probably took place rocking of small margin, and universal joint 61 can change the effect of axis direction to play the effect of protection to driving motor 6.

Referring to fig. 1 and 3, the lower extreme of threaded rod 5 is equipped with carries out spacing first stop gear 7 to descending lift post 1, and the upper end of threaded rod 5 is equipped with carries out spacing second stop gear 8 to ascending lift post 1, and first stop gear 7 and second stop gear 8 have restricted the lift distance of lift post 1 jointly to reduce the condition that continuous movement of lift post 1 caused the damage to the lift grudging post.

Referring to fig. 1 and 2, when the moving nut 11 moves to the lower side of the threaded rod 5, the first limiting mechanism 7 includes a first thrust ball bearing 71 in abutment with the moving nut 11, the first thrust ball bearing 71 is coaxially fitted to the outer side of the connecting portion 52, an abutment spring 72 is in abutment with one side of the first thrust ball bearing 71 away from the moving nut 11, the abutment spring 72 is fitted to the outer side of the connecting portion 52, a fixing ring 73 is in abutment with one side of the abutment spring 72 away from the first thrust ball bearing 71, and the fixing ring 73 is coaxially fixed to the outer side of the connecting portion 52.

A sealing plate 21 is fixed at one end of the sleeve 2 close to the ground, the sealing plate 21 is perpendicular to the side wall of the sleeve 2, a clamping groove 211 for clamping the fixing ring 73 is formed in one side of the sealing plate 21 far away from the sleeve 2, and when the threaded rod 5 is inserted into the sleeve 2, the fixing ring 73 is clamped with the clamping groove 211; one side of the fixed ring 73, which is far away from the abutting spring 72, is abutted with a tapered roller bearing 74, and the tapered roller bearing 74 is coaxially arranged on the connecting part 52 in a penetrating way; a cover plate 22 is further arranged at one end, close to the ground, of the sleeve 2, the cover plate 22 is fixedly connected with the closing plate 21 through bolts, and a fixing groove 221 for accommodating the tapered roller bearing 74 is formed in one side, close to the closing plate 21, of the cover plate 22; when shrouding 21 and apron 22 pass through the bolt fastening, solid fixed ring 73 and joint groove 211 joint, and tapered roller bearing 74 supports tightly with solid fixed ring 73, makes threaded rod 5 realize fixedly in the position of sleeve pipe 2.

When the threaded rod 5 rotates under the driving of the driving motor 6 to enable the movable nut 11 to move downwards, the movable nut 11 is separated from the threaded part 51, the driving motor 6 can continuously keep the original rotation direction to rotate, but the lifting column 1 cannot continuously descend, and at the moment, the threaded rod 5 is in an idle running state, so that the condition that the lifting stand is damaged is reduced; the movable nut 11 abuts against the first thrust ball bearing 71 under the action of gravity, the first thrust ball bearing 71 can reduce the friction force between the abutting spring 72 and the movable nut 11, the abutting spring 72 is compressed under the force, the fixing ring 73 provides a supporting platform for the abutting spring 72, and as the fixing ring 73 is fixed between the closing plate 21 and the cover plate 22 and the sleeve 2 is fixed on the frame body 3, the weight of the lifting column 1 is borne by the frame body 3, and the pressure is not easily caused to the driving motor 6 positioned below the sleeve 2; the tapered roller bearing 74 can function to support the fixing ring 73, reducing the frictional force between the threaded rod 5 and the sleeve 2.

When the lifting column 1 needs to be lifted, the driving motor 6 drives the threaded rod 5 to rotate reversely, the abutting spring 72 provides upward thrust for the moving nut 11, the moving nut 11 moves upwards and is re-meshed with the threaded part 51, the lifting column 1 continues to move upwards, the lifting column 1 extends out of the sleeve 2, and the effect of lifting the awning cloth is achieved.

Referring to fig. 3 and 4, one end of the threaded rod 5 away from the ground further includes an extending portion 53 and an extending portion 54, the extending portion 53 is located between the extending portion 54 and the threaded portion 51, the diameter of the extending portion 53 is larger than that of the extending portion 54, and the second limiting mechanism 8 is mounted on the extending portion 54.

When the traveling nut 11 moves to the upper side of the threaded rod 5, the traveling nut 11 disengages from the threaded portion 51 and enters the projecting portion 53, the second stopper mechanism 8 includes a second thrust ball bearing 81, the second thrust ball bearing 81 is coaxially mounted on the extended portion 54, the second thrust ball bearing 81 can abut against the inner bottom wall of the lifting column 1, and the second thrust ball bearing 81 is restrained on the extended portion 54 since the diameter of the projecting portion 53 is larger than that of the extended portion 54.

One side of the second thrust ball bearing 81, which is far away from the extension part 53, is abutted with a back pressure spring 82, and the back pressure spring 82 is sleeved on the outer side of the extension part 54; the mounting plate 83 is abutted to one side, away from the second thrust ball bearing 81, of the back pressure spring 82, the length of the mounting plate 83 is smaller than the width of the lifting column 1, so that the mounting plate 83 can horizontally rotate in the lifting column 1, the mounting plate 83 is perpendicular to the extending portion 54 and is in sliding connection with the extending portion 54, two mounting nuts 84 are arranged on one side, away from the back pressure spring 82, of the mounting plate 83, the two mounting nuts 84 are in threaded connection with the end portion of the extending portion 54, and the axes of the mounting nuts 84 and the extending portion 54 are located on the same straight line; a washer 85 is further arranged between the mounting nut 84 and the mounting plate 83, the washer 85 is coaxially sleeved on the outer side of the extension portion 54, the washer 85 can increase the contact area between the mounting nut 84 and the mounting plate 83, and damage to the mounting plate 83 is reduced.

The driving motor 6 drives the threaded rod 5 to rotate continuously, the moving nut 11 moves upwards and is separated from the threaded portion 51 to enter the extending portion 53, at the moment, the threaded rod 5 is in an idle running state, the lifting column 1 cannot move upwards continuously, damage to the lifting stand is reduced, the moving nut 11 entering the extending portion 53 keeps a trend of moving upwards under the action of the threaded portion 51, the inner bottom wall of the lifting column 1 is abutted to the second thrust ball bearing 81, the back pressure spring 82 is pressed, the mounting plate 83 provides a supporting platform for the back pressure spring 82, the two mounting nuts 84 and the extending portion 54 are fixed through threads, and the situation that the mounting plate 83 is separated from the extending portion 54 is reduced.

When the lifting column 1 needs to move downwards, the driving motor 6 can reversely drive the threaded rod 5 to rotate, and the return spring 82 provides a downward moving force for the moving nut 11, so that the moving nut 11 can be meshed with the threaded part 51 again, and the lifting effect of the lifting column 1 is ensured.

The implementation principle of the lifting vertical frame for the electric tarpaulin machine in the embodiment of the application is as follows:

the driving motor 6 drives the threaded rod 5 to rotate forwards or reversely, so that the movable nut 11 meshed with the threaded rod 5 can move up and down, when the movable nut 11 moves to the lower side of the threaded rod 5, the first limiting mechanism 7 limits the movable nut 11, the movable nut 11 is separated from the threaded part 51, so that the threaded rod 5 keeps idling, and the damage to the lifting stand caused by the continuous movement of the movable nut 11 is reduced; the first thrust ball bearing 71 reduces the friction between the traveling nut 11 and the threaded rod 5 and, when the traveling nut 11 needs to travel upward, drives the threaded rod 5 in reverse, the abutment spring 72 provides an upward force to the traveling nut 11, causing the traveling nut 11 to reengage the threaded portion 51 and the lifting column 1 to travel upward;

when the movable nut 11 moves to the upper side of the threaded rod 5, the second limiting mechanism 8 limits the movable nut 11, the second thrust ball bearing 81 cannot move downwards under the limitation of the extension part 53, and after the movable nut 11 moves to the upper side of the threaded rod 5 and is separated from the threaded part 51, the movable nut 11 is located at the extension part 53, the threaded rod 5 is in an idle running state, and the lifting column 1 cannot continuously extend upwards; the first limiting mechanism 7 and the second limiting mechanism 8 limit the lifting distance of the lifting column 1 together, and damage to the lifting stand is reduced.

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. The utility model provides an electric tarpaulin machine lift grudging post (1), includes along lift post (1) of sleeve pipe (2) inside wall oscilaltion, one side that sleeve pipe (2) were kept away from in lift post (1) is equipped with threaded rod (5), the one end coaxial fixation that lift post (1) is close to ground has removal nut (11), remove nut (11) and threaded rod (5) threaded connection, just sleeve pipe (2) are stretched out to the one end of threaded rod (5) and be connected with driving motor (6), the cross section of lift post (1) and sleeve pipe (2) is the rectangle, its characterized in that: the middle section of threaded rod (5) is equipped with screw portion (51) with removal nut (11) meshing, threaded rod (5) are close to the one end on ground and install and carry out spacing first stop gear (7) to descending lift post (1), threaded rod (5) are kept away from the one end on ground and are installed and carry out spacing second stop gear (8) to ascending lift post (1).

2. The lifting stand for electric tarpaulin machine of claim 1, characterized in that: threaded rod (5) still include glossy connecting portion (52), connecting portion (52) are located threaded rod (5) and are close to the one end on ground, coaxial fixed ring (73) have been fixed in connecting portion (52), fixed slot (221) that supply fixed ring (73) to peg graft are seted up to sleeve pipe (2) inside wall, fixed ring (73) are fixed with fixed slot (221) looks gomphosis, one side butt joint that fixed ring (73) are close to screw thread portion (51) has butt spring (72), butt spring (72) cover is in the outside of connecting portion (52).

3. The lifting stand for electric tarpaulin machine of claim 2, characterized in that: one side, close to the threaded portion (51), of the abutting spring (72) is provided with a first thrust ball bearing (71), the first thrust ball bearing (71) is coaxially sleeved on the outer side of the connecting portion (52), and one side, far away from the abutting spring (72), of the first thrust ball bearing (71) is abutted to one side, far away from the lifting column (1), of the moving nut (11).

4. The lifting stand for electric tarpaulin machine of claim 2, characterized in that: sleeve pipe (2) are close to the one end on ground and are fixed with shrouding (21), apron (22) are still installed to one side that sleeve pipe (2) were kept away from in shrouding (21), connecting portion (52) run through apron (22) and are connected with driving motor (6), just through the bolt fastening between shrouding (21) and apron (22), and first stop gear (7) still include tapered roller bearing (74), tapered roller bearing (74) are located one side that solid fixed ring (73) kept away from butt spring (72), one side and apron (22) butt that solid fixed ring (73) were kept away from in tapered roller bearing (74).

5. The lifting stand for electric tarpaulin machine of claim 2, characterized in that: threaded rod (5) still include extension (54), extension (54) are located threaded rod (5) and keep away from the one end of connecting portion (52), second stop gear (8) are installed on extension (54), second stop gear (8) include and install second thrust ball bearing (81) of the one end looks butt of removal nut (11) with lift post (1), one side that screw portion (51) were kept away from in second thrust ball bearing (81) has been supported and has been had back pressure spring (82), one side that second thrust ball bearing (81) were kept away from in back pressure spring (82) has been supported and has been had mounting panel (83), one side that back pressure spring (82) were kept away from in mounting panel (83) has been supported and has been had mounting nut (84), mounting nut (84) are fixed with extension (54) threaded connection.

6. The lifting stand for electric tarpaulin machine of claim 5, characterized in that: the threaded rod (5) further comprises a protruding portion (53), the protruding portion (53) is coaxially installed between the extending portion (54) and the threaded portion (51), and the diameter of the protruding portion (53) is larger than that of the extending portion (54) and smaller than that of the threaded portion (51).

7. The lifting stand for electric tarpaulin machine of claim 5, characterized in that: and a gasket (85) is also arranged between the mounting nut (84) and the mounting plate (83).

8. The lifting stand for electric tarpaulin machine of claim 1, wherein: and a universal joint (61) is also connected between the threaded rod (5) and the driving motor (6).