A fast, efficient and safe flatbed spreader

Abstract

The present invention belongs to the technical field of slings, solves the technical problem of poor stability of slings in the prior art when lifting flat panels, and provides a fast, efficient and safe flat panel sling, including a mounting mechanism and a grabbing mechanism; the mounting mechanism includes a main frame and a crossbeam, the main frame is rectangular, the crossbeam is arranged at a central position above the main frame, a telescopic sleeve is connected between the crossbeam and the main frame, an articulated frame is respectively provided at both ends of the crossbeam, and an articulated groove with an opening facing upward is respectively opened at both ends of the main frame along the width direction, and the two ends of the articulated groove are respectively connected, and the articulated groove is located directly below the articulated frame; the grabbing mechanism includes four connecting rods and four grabbing rods, and the four connecting rods and the four grabbing rods are respectively grouped in pairs to form four grabbing components. The fast, efficient and safe flat panel sling described in the present invention has the advantage of high stability when lifting flat panels.

Description

Technical Field

[0001] The invention relates to the technical field of slings, and in particular to a fast, efficient and safe flat sling. Background Art

[0002] During the production process, steel plates often need to be transported using hoists. The existing flat hoists have low lifting efficiency and poor stability when hooking, and the plates are prone to imbalance and unhooking. At the same time, the existing flat hoists are limited to single and thin plates, and are prone to falling off when lifting multiple plates. Summary of the invention

[0003] The embodiment of the present invention provides a fast, efficient and safe flat plate lifting device, which is used to solve the technical problem of poor stability of the lifting device when lifting a flat plate.

[0004] The embodiment of the present invention provides a fast, efficient and safe flatbed hanger, including a mounting mechanism and a grabbing mechanism;

[0005] The mounting mechanism comprises a main frame and a crossbeam, wherein the main frame is rectangular, the crossbeam is arranged at a central position above the main frame, a telescopic sleeve is connected between the crossbeam and the main frame, an articulated frame is respectively arranged at both ends of the crossbeam, and an articulated groove with an opening facing upward is respectively opened at both ends of the main frame along the width direction, and both ends of the articulated groove are respectively connected, and the articulated groove is located directly below the articulated frame;

[0006] The grabbing mechanism includes four connecting rods and four grabbing rods, and the four connecting rods and the four grabbing rods are respectively grouped in pairs to form four grabbing components, each of the grabbing components includes a connecting rod and a grabbing rod, and each two of the grabbing components are grouped as a group and are symmetrically arranged in a hinge groove, one end of each of the connecting rods is hinged to the corresponding hinge frame, and the other end of each of the connecting rods is hinged to its respective corresponding grabbing rod, and the other end of each of the grabbing rods is hinged to the side wall of the through-point of its corresponding hinge groove, and the grabbing rod is an L-shaped structure, and the bending part of the grabbing rod is bent downward.

[0007] Its working principle and process are as follows:

[0008] When grabbing the steel plate, the crossbeam drives the link rod to lift upward through the articulated frame. After the grab rod located in the same articulated groove is stressed, its bent section grabs the edge of the steel plate. As the crossbeam rises, the tension gradually increases, and the relative distance between the two grab rods in the same articulated groove gradually decreases, so that the two groups of grab rods firmly grab the steel plate and safely lift the steel plate. The telescopic sleeve plays a role in firmly connecting the main frame and the crossbeam.

[0009] When the steel plate is lowered, the crossbeam drives the link rod to move downward, and the relative distance between the two sets of grasping mechanisms gradually increases to release the steel plate.

[0010] Furthermore, the telescopic sleeve includes a first sleeve, two second sleeves and corresponding first rods and two second rods. A mounting frame is provided at the central position of the main frame, the first sleeve is vertically arranged on the mounting frame, the first rod is arranged at the lower end of the central position of the crossbeam, and the first rod is slidably arranged in the first sleeve; a second rod is provided at the lower end of the articulated frame, a second sleeve is provided at the central position of the articulated groove, and the second rod is slidably arranged in the second sleeve.

[0011] The first set of rods cooperates with the first sleeve to guide and provide supporting force, and the second sleeve and the second set of rods cooperate to support the two ends of the main frame and stabilize the sling.

[0012] Furthermore, a plurality of clamping teeth are provided on the inner surface of the bend of the grabbing rod.

[0013] The clamping teeth increase the friction of the grab bar, preventing the steel plate from loosening and making the lifting more stable.

[0014] Furthermore, a locking mechanism for locking the crossbeam to prevent it from moving up and down is provided in the first sleeve rod and the first sleeve.

[0015] The setting of the locking mechanism can lock the grasping mechanism to prevent the crossbeam from moving up and down. No additional power supply is required, which reduces the cost of use. The pure mechanical structure has a low failure rate and low maintenance cost.

[0016] Furthermore, the first sleeve rod is hollow inside and penetrates at one end away from the cross beam, the locking mechanism includes a trigger rod and a hook, a horizontally arranged guide plate is provided on the inner side wall of the first sleeve rod, a guide hole is vertically opened on the guide plate, the trigger rod is slidably arranged in the guide hole, a fixing rod is provided on the inner side wall of the first sleeve rod, the fixing rod is arranged parallel to the guide plate, a trigger wheel, a cam and a positioning wheel coaxially connected as one are rotatably provided on the fixing rod, a positioning clamp for positioning the positioning wheel is provided on one side of the positioning wheel, a blocking block for driving the trigger wheel to rotate is provided on the side of the trigger rod close to the trigger wheel, the blocking block abuts against the trigger wheel, the connecting end of the hook is hinged on the inner side wall of the first sleeve rod, and after the hook rotates to the maximum swing position, its free end abuts against the inner wall of the first sleeve, and the cam abuts against the hook when in a horizontal state, and a hook strip is formed on the inner wall of the first sleeve.

[0017] During the operation of the locking mechanism, when the crossbeam moves for the first time, it first moves upward for a distance and then the trigger rod returns to its position and then moves downward. When the trigger rod is pushed upward along the guide hole, the block drives the trigger wheel to rotate 90 degrees and the cam also rotates 90 degrees (horizontally) to push the hook outward to open. At this time, the hook can hook the hook bar on the inner wall of the first sleeve to realize the lifting of the entire hanger. When lifting, the trigger rod returns to its position; at the same time, gravity and the cam mechanism are used to lock the crossbeam and stop it from moving up and down. At this time, the hoist can be lifted as a whole and separated from the steel plate, and the positioning wheel and the positioning clamp realize the accurate positioning of the cam position;

[0018] When the beam moves downward for the second time and the trigger rod is pushed upward again, it drives the trigger wheel to rotate 90 degrees and the cam also rotates 90 degrees (vertical) and the hook is retracted inward. At this time, the hook cannot hook the hook bar on the inner wall of the first sleeve, so that the upper part of the hanger rises and drives the grabbing rod to grab the plate. When lifting, the trigger rod returns to its position; when the beam moves again, it returns to the first downward movement state; through the first and second up and down movements of the beam, a locking and opening cycle is realized.

[0019] Furthermore, four arc-shaped grooves are provided on the circumferential side surface of the positioning wheel, and the four arc-shaped grooves are distributed in a circular array relative to the axis of the positioning wheel. The positioning clamp includes a positioning rod vertically arranged on the guide plate, and the positioning rod is T-shaped. The positioning rod is slidingly connected to the guide plate, and the positioning rod is arranged above the positioning wheel. The lower end of the positioning rod is spherical, and the lower end of the positioning rod abuts against the arc-shaped groove on the positioning wheel.

[0020] The arrangement of the positioning rod and the arc-shaped groove can ensure that the cam is in a vertical state or a horizontal state each time it rotates, and there will be no inaccurate state.

[0021] Furthermore, the block is in a right triangle structure, with its inclined surface facing the trigger wheel and being an arc-shaped surface, the initial state of the cam is a vertical state, the trigger wheel is in a four-cornered dart shape, and the four corner edges of the trigger wheel are all arc-shaped edges.

[0022] The dart-shaped structure of the four corners of the trigger wheel and the setting of the arc-shaped inclined surface of the card block are conducive to the downward movement of the card block. At the same time, when the card block moves upward, it will not get stuck.

[0023] Furthermore, the main frame is provided with a height adjustment mechanism, and the height adjustment mechanism is arranged at both ends of the main frame. The height adjustment mechanism includes a vertically arranged fixed cylinder and a support rod slidably arranged in the fixed cylinder, and a limiting slide bar and a limiting slide groove are respectively provided on the outer wall of the support rod and the inner wall of the fixed cylinder, and the limiting slide bar and the limiting slide groove cooperate with each other, and the lower end of the fixed cylinder is through, and a rotating handle is rotatably provided on the top of the fixed cylinder, and the lower end of the rotating handle is connected to a threaded screw, and the threaded screw is arranged in the fixed cylinder, and the lower end of the threaded screw is connected to the top of the support rod by a thread.

[0024] When using the lifting device to lift the steel plate, the handle can be turned to drive the threaded screw to rotate, thereby adjusting the support rod to slide up and down in the fixed tube, thereby changing the vertical distance between the bottom end of the support rod and the bottom end of the grabbing rod, thereby achieving the adjustment of the number of steel plates grabbed by the tip of the grabbing rod.

[0025] Furthermore, there are four height adjustment mechanisms, which are respectively arranged at the four corners of the main frame.

[0026] The arrangement of the height adjustment mechanisms at the four corners makes the thickness adjustment of the device more accurate.

[0027] In summary, the beneficial effects of the present invention are as follows:

[0028] The present invention drives the grabbing mechanism to grab and place the steel plate through the up and down movement of the crossbeam, and realizes the fastening and grabbing of the steel plate through the steel plate's own gravity and lifting force. It has high operating stability and can be automatically mechanically locked to ensure lifting safety. It has a simple structure and is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a three-dimensional structural schematic diagram of the sling in the present invention;

[0030] Figure 2 It is a main cross-sectional view of the overall structure of the present invention;

[0031] Figure 3 It is a side view of the overall structure of the present invention;

[0032] Figure 4 It is a front view of the locking mechanism in the present invention;

[0033] Figure 5 It is a three-dimensional structural schematic diagram of the locking mechanism in the present invention.

[0034] In the figure: 1. installation mechanism; 11. main frame; 111. hinge groove; 12. crossbeam; 13. telescopic sleeve; 131. first sleeve; 132. first set of rods; 133. second sleeve; 134. second set of rods; 14. articulated frame; 2. grabbing mechanism; 21. connecting rod; 22. grabbing rod; 3. height adjustment mechanism; 31. fixing cylinder; 32. supporting rod; 33. rotating handle; 34. threaded screw; 4. locking mechanism; 41. guide plate; 42. trigger rod; 43. block; 44. positioning rod; 45. hook; 46. positioning wheel; 47. cam; 48. fixing rod; 49. trigger wheel. DETAILED DESCRIPTION

[0035] Embodiment 1:

[0036] like Figure 1-Figure 5 As shown, a fast, efficient and safe flat plate lifting device comprises a mounting mechanism 1 and a grabbing mechanism 2;

[0037] The mounting mechanism 1 comprises a main frame 11 and a crossbeam 12. The main frame 11 is rectangular. The crossbeam 12 is arranged at the central position above the main frame 11. A telescopic sleeve 13 is connected between the crossbeam 12 and the main frame 11. An articulated frame 14 is respectively arranged at both ends of the crossbeam 12. A hinge groove 111 with an opening facing upward is respectively opened at both ends of the main frame 11 along the width direction. Both ends of the hinge groove 111 are respectively connected. The hinge groove 111 is located directly below the articulated frame.

[0038] The grabbing mechanism 2 includes four connecting rods 21 and four grabbing rods 22. The four connecting rods 21 and the four grabbing rods 22 are respectively grouped in pairs to form four grabbing components. Each grabbing component includes a connecting rod 21 and a grabbing rod 22. Every two grabbing components form a group and are symmetrically arranged in a hinge groove 111. One end of each connecting rod 21 is hinged to the corresponding hinge frame 14, and the other end of each connecting rod 21 is hinged to its respective corresponding grabbing rod 22. The other end of each grabbing rod 22 is hinged to the side wall of the through-point of the corresponding hinge groove 111. The grabbing rod 22 is an L-shaped structure, and the bending part of the grabbing rod 22 is bent downward.

[0039] The telescopic sleeve 13 includes a first sleeve 131, two second sleeves 133 and corresponding first rods 132 and two second rods 134. A mounting frame is provided at the central position of the main frame 11, the first sleeve 131 is vertically arranged on the mounting frame, the first rod 132 is arranged at the lower end of the central position of the crossbeam 12, and the first rod 132 is slidably arranged in the first sleeve 131; a second rod 134 is provided at the lower end of the articulated frame 14, a second sleeve 133 is provided at the central position of the articulated groove 111, and the second rod 134 is slidably arranged in the second sleeve 133.

[0040] The first set of rods 132 cooperates with the first sleeve 131 to guide and provide support force, and the second sleeve 133 and the second set of rods 134 cooperate to support both ends of the main frame 11 and stabilize the sling.

[0041] The inner surface of the bend of the grab rod 22 is provided with a plurality of clamping teeth.

[0042] The clamping teeth increase the friction of the grab bar 22, preventing the steel plate from loosening and making the lifting more stable.

[0043] The first rod 132 and the first sleeve 131 are provided with a locking mechanism 4 for locking the crossbeam 12 from moving up and down. The first rod 132 and the first sleeve 131 are both rectangular parallelepiped structures.

[0044] The first rod 132 is hollow inside and penetrates at one end away from the crossbeam 12. The locking mechanism 4 includes a trigger rod 42 and a hook 45. A horizontally arranged guide plate 41 is provided on the side wall of the first rod 132. A guide hole is vertically opened on the guide plate 41. The trigger rod 42 is slidably arranged in the guide hole. A fixing rod 48 is provided on the inner side wall of the first rod 132. The fixing rod 48 is arranged parallel to the guide plate 41. A trigger wheel 49, a cam 47 and a positioning wheel 46 are rotatably arranged on the fixing rod 48. A positioning clamp for positioning the positioning wheel 46 is provided on one side of the positioning wheel 46, and a clamping block 43 for driving the trigger wheel 49 to rotate is provided on the side of the trigger rod 42 close to the trigger wheel 49, and the clamping block 43 abuts against the trigger wheel 49. The connecting end of the hook 45 is hinged on the side wall of the first sleeve rod 132. After the hook 45 rotates to the maximum swing position, its free end abuts against the inner wall of the first sleeve 131. The cam 47 abuts against the hook 45 when in a horizontal state, and a hook strip is formed on the inner wall of the first sleeve 131.

[0045] Four arc-shaped grooves are provided on the circumferential side surface of the positioning wheel 46, and the four arc-shaped grooves are distributed in a circular array relative to the axis of the positioning wheel 46. The positioning clamp includes a positioning rod 44 vertically arranged on the guide plate, and the positioning rod 44 is T-shaped. The positioning rod 44 is slidingly connected to the guide plate, and the positioning rod 44 is arranged above the positioning wheel 46. The lower end of the positioning rod 44 is spherical, and the lower end of the positioning rod 44 abuts against the arc-shaped groove on the positioning wheel 46.

[0046] The arrangement of the positioning rod 44 and the arc-shaped groove enables the cam 47 to be in a vertical state or a horizontal state each time it rotates, and there will be no inaccurate state.

[0047] The block 43 is in a right triangle structure, with its inclined surface facing the trigger wheel 49 and being an arcuate surface. The initial state of the cam 47 is a vertical state. The trigger wheel 49 is in a four-cornered dart shape, and the four corners of the trigger wheel 49 are all arcuate.

[0048] The dart-shaped structure of the four corners of the trigger wheel 49 and the setting of the arc-shaped inclined surface of the card block are conducive to the downward movement of the card block. At the same time, when the card block moves upward, it will not get stuck.

[0049] Its working principle and process are as follows:

[0050] When grabbing the steel plate, the crossbeam 12 drives the link rod 21 to rise upward through the hinge frame 14. After the grab rod 22 located in the same hinge groove 111 is stressed, its bent section grabs the edge of the steel plate. As the crossbeam 12 rises, the tension gradually increases, and the relative distance between the two grab rods 22 in the same hinge groove 111 gradually decreases, so that the two groups of grab rods 22 firmly grab the steel plate and safely lift the steel plate. The telescopic sleeve 13 plays a role in firmly connecting the main frame 11 and the crossbeam 12.

[0051] When the steel plate is put down, the crossbeam 12 drives the link rod 21 to move downward, and the relative distance between the two groups of grasping mechanisms 2 gradually increases to release the steel plate.

[0052] During the operation of the locking mechanism 4, when the cross beam 12 moves for the first time, it first moves upward for a distance and then the trigger rod 42 returns to its position and then moves downward. When the trigger rod 42 is pushed upward along the guide hole, the block 43 drives the trigger wheel 49 to rotate 90 degrees. At the same time, the cam 47 also rotates 90 degrees (horizontally) and opens outward against the hook 45. At this time, the hook 45 can hook the hook bar on the inner wall of the first sleeve 131 to realize the lifting of the entire hanger. When lifting, the trigger rod 42 returns to its position; at the same time, gravity and the cam 47 mechanism are used to lock the cross beam 12 and stop it from moving up and down. At this time, the hoist can be lifted as a whole and separated from the steel plate. The positioning wheel 46 and the positioning clamp realize the accurate positioning of the cam position.

[0053] When the beam 12 moves downward for the second time and the trigger rod 42 is lifted upward again, the trigger wheel 49 is driven to rotate 90 degrees and the cam 47 is also rotated 90 degrees (erected) and the hook 45 is retracted inward. At this time, the hook 45 cannot hook the hook bar on the inner wall of the first sleeve 131, so that the upper part of the hanger is lifted to drive the grabbing rod 22 to grab the plate. When the trigger rod 42 is lifted, it returns to the first downward movement state when the beam 12 moves again. A locking and opening cycle is realized through the first and second up and down movements of the beam 12. The setting of the locking mechanism 4 can lock the grabbing mechanism 2 to prevent the beam 12 from moving up and down, without the need for additional power supply, reducing the use cost, and the pure mechanical structure has a low failure rate and low maintenance cost.

[0054] Embodiment 2:

[0055] like Figure 1-Figure 3As shown, on the basis of Example 1, this embodiment is provided with a height adjustment mechanism 3 on the main frame 11, and the height adjustment mechanism 3 is arranged at both ends of the main frame 11. The height adjustment mechanism 3 includes a vertically arranged fixed cylinder 31 and a support rod 32 slidably arranged in the fixed cylinder 31, and a limiting slide bar and a limiting slide groove are respectively provided on the outer wall of the support rod 32 and the inner wall of the fixed cylinder 31, and the limiting slide bar and the limiting slide groove cooperate with each other, and the lower end of the fixed cylinder 31 is passed through, and a rotating handle 33 is rotatably provided on the top of the fixed cylinder 31, and a threaded screw 34 is connected to the lower end of the rotating handle 33, and the threaded screw 34 is arranged in the fixed cylinder 31, and the lower end of the threaded screw 34 is connected to the top of the support rod 32 by a thread.

[0056] When the steel plate is lifted by the lifting device, the handle 33 can be rotated to drive the screw rod 34 to rotate, thereby adjusting the support rod 32 to slide up and down in the fixed tube 31, thereby changing the vertical distance between the bottom end of the support rod 32 and the bottom end of the grabbing rod 22, thereby adjusting the number of steel plates grabbed by the tip of the grabbing rod 22. When the vertical distance is greater than the thickness of two steel plates, two steel plates can be grabbed, and when the vertical distance is less than the thickness of two steel plates, one steel plate can be grabbed, thereby adjusting the number of steel plates grabbed.

[0057] There are four height adjustment mechanisms 3 , which are respectively arranged at four corners of the main frame 11 .

[0058] By providing the four corner height adjustment mechanisms 3, the thickness adjustment of the device can be made more accurate.

[0059] The rest of the structure and working principle of Example 2 are the same as those of Example 1.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fast, efficient and safe flatbed spreader, characterized in that: Including a mounting mechanism and a grabbing mechanism; The mounting mechanism comprises a main frame and a crossbeam, wherein the main frame is rectangular, the crossbeam is arranged at a central position above the main frame, a telescopic sleeve is connected between the crossbeam and the main frame, an articulated frame is respectively arranged at both ends of the crossbeam, and an articulated groove with an opening facing upward is respectively opened at both ends of the main frame along the width direction, and both ends of the articulated groove are respectively connected, and the articulated groove is located directly below the articulated frame; The grabbing mechanism comprises four connecting rods and four grabbing rods, and the four connecting rods and the four grabbing rods are respectively grouped in pairs to form four grabbing parts, each of the grabbing parts comprises a connecting rod and a grabbing rod, and each two of the grabbing parts are grouped in a symmetrical arrangement in a hinge groove, and one end of each of the connecting rods is hinged to the corresponding hinge frame, and the other end of each of the connecting rods is hinged to the grabbing rod corresponding to it, and the other end of each of the grabbing rods is hinged to the side wall of the corresponding hinge groove, and the grabbing rods are L-shaped structures, and the bending parts of the grabbing rods are bent downwards; The telescopic sleeve comprises a first sleeve, two second sleeves and corresponding first sleeve rods and two second sleeve rods. A mounting frame is arranged at the central position of the main frame, the first sleeve is arranged vertically on the mounting frame, the first sleeve rod is arranged at the lower end of the central position of the crossbeam, and the first sleeve rod is slidably arranged in the first sleeve; a second sleeve rod is arranged at the lower end of the articulated frame, a second sleeve is arranged at the central position of the articulated groove, and the second sleeve rod is slidably arranged in the second sleeve; The first sleeve rod and the first sleeve are provided with a locking mechanism for locking the crossbeam from moving up and down; The interior of the first sleeve rod is hollow and passes through one end away from the cross beam. The locking mechanism includes a trigger rod and a hook. A horizontally arranged guide plate is provided on the inner side wall of the first sleeve rod, and a guide hole is vertically opened on the guide plate. The trigger rod is slidably arranged in the guide hole. A fixing rod is provided on the inner side wall of the first sleeve rod. The fixing rod is arranged parallel to the guide plate. A trigger wheel, a cam and a positioning wheel coaxially connected as one are rotatably provided on the fixing rod. A positioning clamp for positioning the positioning wheel is provided on one side of the positioning wheel. A blocking block for driving the trigger wheel to rotate is provided on the side of the trigger rod close to the trigger wheel. The blocking block abuts against the trigger wheel. The connecting end of the hook is hinged on the inner side wall of the first sleeve rod. After the hook rotates to the maximum swing position, its free end abuts against the inner wall of the first sleeve. The cam abuts against the hook when in a horizontal state. A hook strip is formed on the inner wall of the first sleeve.

2. The fast, efficient and safe flatbed spreader according to claim 1 is characterized in that: The inner surface of the bending part of the grabbing rod is provided with a plurality of clamping teeth.

3. The fast, efficient and safe flatbed spreader according to claim 1 is characterized in that: Four arc-shaped grooves are provided on the circumferential side surface of the positioning wheel, and the four arc-shaped grooves are distributed in a circular array relative to the axis of the positioning wheel. The positioning clamp includes a positioning rod vertically arranged on the guide plate, and the positioning rod is T-shaped. The positioning rod is slidably connected to the guide plate, and the positioning rod is arranged above the positioning wheel. The lower end of the positioning rod is spherical, and the lower end of the positioning rod abuts against the arc-shaped groove on the positioning wheel.

4. The fast, efficient and safe flatbed spreader according to claim 3 is characterized in that: The block is in a right triangle structure, with an inclined surface facing the trigger wheel and being an arc-shaped surface. The initial state of the cam is a vertical state. The trigger wheel is in a four-cornered dart shape, and the four corner edges of the trigger wheel are all arc-shaped edges.

5. The fast, efficient and safe flatbed spreader according to claim 1 is characterized in that: The main frame is provided with a height adjustment mechanism, and the height adjustment mechanism is arranged at both ends of the main frame. The height adjustment mechanism includes a vertically arranged fixed cylinder and a support rod slidably arranged in the fixed cylinder. A limiting slide bar and a limiting slide groove are respectively provided on the outer wall of the support rod and the inner wall of the fixed cylinder. The limiting slide bar and the limiting slide groove cooperate with each other. The lower end of the fixed cylinder is through, and a rotating handle is rotatably provided at the top of the fixed cylinder. The lower end of the rotating handle is connected to a threaded screw, and the threaded screw is arranged in the fixed cylinder. The lower end of the threaded screw is connected to the top of the support rod by a thread.

6. The fast, efficient and safe flatbed spreader according to claim 5, characterized in that: There are four height adjustment mechanisms, which are respectively arranged at the four corners of the main frame.

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