A manual lifting rod

Abstract

The present invention discloses a manually-operated lifting rod, which comprises a lifting rod main body and a lifting driving device. The lifting rod main body includes an outer sleeve, an intermediate sleeve and an inner sleeve that are slidably sleeved with each other from outside to inside in sequence. A first fixed pulley is rotatably installed at the top of the outer sleeve. A transmission cavity is provided at the bottom of the outer sleeve, and a second fixed pulley is rotatably installed in the transmission cavity. A first movable pulley and a second movable pulley are respectively rotatably installed at the bottom and the top of the intermediate sleeve. The other end of the first winding rope is fixedly connected to the bottom of the inner sleeve after winding around the first fixed pulley, the first movable pulley and the second movable pulley in sequence. One end of the second winding rope is fixedly connected to the second winding wheel, and the other end of the second winding rope is fixedly connected to the bottom of the inner sleeve after winding around the first fixed pulley and the second fixed pulley in sequence. When the first winding rope is loosened, the second winding rope is tensioned, and the lifting rod has power during the descending process, and it is not easy to get stuck during the lifting process, effectively reducing the failure rate of the lifting rod during use.

Description

Technical Field

[0001] The present invention relates to a lifting rod, and particularly to a manual lifting rod. Background Art

[0002] Existing emergency vehicles are often equipped with communication devices such as antenna turrets. However, due to the great influence of the earth's curvature, high mountains, and the numerous high-rise buildings in the city on target detection and wireless information transmission, it is necessary to raise antennas, cameras, etc. to a certain height to eliminate these influences and meet the system requirements. The lifting rod is the main means to achieve the above functions. It can lift various different loads to a height of several meters to dozens of meters, posing high requirements for the portability and quick deployment of the lifting rod. Currently, ordinary pulley-type lifting rods used for erecting loads such as antennas usually have the following defects: 1. Low transmission efficiency, laborious and time-consuming to operate. 2. It is strictly prohibited to lower the load without load. Since there is no power during the lowering process and it relies on its own weight to lower, it is easy to cause harm. 3. The lifting process is prone to jamming and has a high failure rate. Summary of the Invention

[0003] The present invention aims to solve the problems existing in the above prior art and provides a manual lifting rod that does not solely rely on its own weight to lower, is not easily harmful, and has advantages such as high transmission efficiency and not being easily jammed during the lifting process.

[0004] The technical solution adopted by the present invention to solve its technical problems: A manual lifting rod includes a lifting rod main body and a lifting drive device. The lifting rod main body includes an outer sleeve, an intermediate sleeve, and an inner sleeve that are slidably sleeved in sequence from the outside to the inside. A first fixed pulley is rotatably installed at the top of the outer sleeve, and a transmission cavity is provided at the bottom of the outer sleeve. A second fixed pulley is rotatably installed in the transmission cavity. A first movable pulley and a second movable pulley are respectively rotatably installed at the bottom and top of the intermediate sleeve. The lifting drive device includes a bracket, a wire winding shaft, a hand crank, a first wire winding wheel, a second wire winding wheel, a first wire rope, and a second wire rope. The bracket is detachably and fixedly connected to the outer sleeve. The wire winding shaft is rotatably installed on the bracket. One end of the wire winding shaft is fixedly connected to the hand crank, and a rotation locking mechanism is provided between the hand crank and the bracket. The first wire winding wheel and the second wire winding wheel are fixedly installed on the wire winding shaft. One end of the first wire rope is fixedly connected to the first wire winding wheel. The other end of the first wire rope is sequentially wound around the first fixed pulley, the first movable pulley, and the second movable pulley and then fixedly connected to the bottom of the inner sleeve. One end of the second wire rope is fixedly connected to the second wire winding wheel. The other end of the second wire rope is sequentially wound around the first fixed pulley and the second fixed pulley and then fixedly connected to the bottom of the inner sleeve.

[0005] For further improvement, a fourth fixed pulley symmetric to the first fixed pulley is also provided at the top of the outer sleeve. Third and fourth movable pulleys symmetric to the first and second movable pulleys are respectively provided at the bottom and top of the intermediate sleeve. A third fixed pulley is also rotatably installed in the transmission cavity. The lifting drive device further includes a third winding rope. One end of the third winding rope is fixedly connected to the first winding wheel, and the other end of the third winding rope is fixedly connected to the bottom of the inner sleeve after sequentially winding around the first fixed pulley, the second fixed pulley, the third fixed pulley, the fourth fixed pulley, the third movable pulley, and the fourth movable pulley.

[0006] For further improvement, oil storage end covers are provided at the upper part of the outer sleeve, the upper end of the intermediate sleeve, and the lower end of the transmission cavity. The oil storage end cover is a disc-shaped hollow structure filled with lubricating oil inside. An oil outlet is provided on the end face of the oil storage end cover, and an oil seepage block for contacting the pulley for lubrication is provided on the oil outlet.

[0007] For further improvement, the rotation locking mechanism includes a toothed disc, an inclined locking tongue, a return spring, a pull rod, and a bolt. The toothed disc is sleeved outside the winding shaft and fixedly connected to the side wall of the bracket. A telescopic groove is provided inside the hand crank, and an inclined locking tongue cooperating with the toothed disc is slidably installed in the telescopic groove. A return spring is provided between the inclined locking tongue and the telescopic groove. A pull rod is slidably installed on the outer side of the hand crank. One end of the pull rod is fixedly connected to the inclined locking tongue, and two spaced positioning pin holes are provided at one end of the pull rod. One end of the bolt is slidably connected to the outer side wall of the hand crank, and the other end of the bolt is inserted and cooperated with the two positioning pin holes.

[0008] For further improvement, a telescopic support rod is slidably installed inside the inner sleeve. A support spring is provided between the upper end of the telescopic support rod and the inner sleeve, and a buffer cushion block is provided between the lower end of the telescopic support rod and the transmission cavity.

[0009] For further improvement, a first movable plug slidably connected to the inner cavity of the outer sleeve is provided at the lower end of the intermediate sleeve, and a second movable plug slidably connected to the inner cavity of the intermediate sleeve is provided at the lower end of the inner sleeve. The first fixed pulley is located between the outer sleeve and the intermediate sleeve, and the second movable pulley is located between the intermediate sleeve and the inner sleeve.

[0010] For further improvement, a detachable base is provided at the bottom of the outer sleeve. A control panel is installed on the surface of the base. An electric three-jaw chuck is provided at the upper part of the base, and a fixing plate, an electromagnet, and an electric vacuum chuck are provided at the lower part of the base. The electric three-jaw chuck, the electromagnet, and the electric vacuum chuck are all electrically connected to the control panel.

[0011] Further improvement: A fixed connection is provided between the first wire reel and the winding shaft, a rotating connection is provided between the second wire reel and the winding shaft, and a gear reversing transmission mechanism is provided between the first wire reel and the second wire reel. The gear reversing transmission mechanism is used to make the second wire reel rotate in the opposite direction relative to the first wire reel.

[0012] Further improvement: A counterweight device is provided on the main body of the lifting rod. The counterweight device includes a U-shaped counterweight block slidably sleeved on the outer sleeve, an annular counterweight block slidably sleeved on the middle sleeve, a fifth fixed pulley rotatably installed on the annular counterweight block, a fifth movable pulley rotatably installed at the upper end of the inner sleeve, and a first counterweight rope and a second counterweight rope. One end of the first counterweight rope is fixedly connected to the U-shaped counterweight block, and a magnetic seat is provided on the U-shaped counterweight block. The other end of the first counterweight rope is wound around the fifth fixed pulley and then fixedly connected to the lower end of the middle sleeve. One end of the second counterweight rope is fixedly connected to the annular counterweight block, and the other end of the second counterweight rope is wound around the fifth movable pulley and then fixedly connected to the lower end of the inner sleeve.

[0013] The beneficial effects of the present invention are as follows: The first wire reel and the second wire reel of the present invention are respectively used to control the rise and fall of the main body of the lifting rod, and the first wire reel and the second wire reel are interconnected. When the first wire rope is tightened, the second wire rope is relaxed to achieve the rising operation. When the first wire rope is relaxed, the second wire rope is tightened to achieve the falling operation. The transmission efficiency is improved, the operation is convenient, it can descend without load, has power during the descending process, does not solely rely on its own weight to descend, is not easy to cause harm, and is not easy to get stuck during the lifting process, effectively reducing the failure rate of the lifting rod during use. Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of Embodiment 1;

[0015] Figure 2 It is a schematic structural diagram of Embodiment 2;

[0016] Figure 3 It is a schematic structural diagram of Embodiment 3;

[0017] Figure 4 It is a schematic structural diagram of Embodiment 4;

[0018] Description of reference numerals: 1. Outer sleeve, 11. First fixed pulley, 12. Transmission cavity, 13. Second fixed pulley, 14. Fourth fixed pulley, 15. Third fixed pulley, 2. Intermediate sleeve, 21. First movable pulley, 22. Second movable pulley, 23. Third movable pulley, 24. Fourth movable pulley, 25. First piston, 3. Inner sleeve, 31. Telescopic support rod, 32. Support spring, 33. Buffer pad, 34. Second piston, 4. Lifting drive device, 41. Bracket, 42. Reel, 43. Hand crank, 44. First winding wheel, 45. Second winding wheel, 46. First winding rope, 47. Second winding rope, 48. Third winding rope, 49. Gear reversing transmission mechanism, 5. Rotation locking mechanism, 51. Tooth disc, 52. Inclined locking tongue, 53. Return spring, 54. Pull rod, 55. Bolt, 56. Telescopic groove, 57. Positioning pin hole, 6. Oil storage end cover, 7. Base, 71. Control panel, 72. Fixed plate, 73. Electromagnet, 74. Electric vacuum chuck, 75. Electric three-jaw chuck, 8. Counterweight device, 81. U-shaped counterweight, 82. Annular counterweight, 83. Fifth fixed pulley, 84. Fifth movable pulley, 85. First counterweight rope, 86. Second counterweight rope, 87. Magnetic seat. Detailed implementation mode

[0019] The present invention will be further described below with reference to the accompanying drawings:

[0020] Refer to the attached Figure 1 : A manual lifting rod in Embodiment 1 of the present invention includes a lifting rod main body and a lifting drive device 4. The lifting rod main body includes an outer sleeve 1, an intermediate sleeve 2, and an inner sleeve 3 that are sequentially sleeved and slid from outside to inside. A first fixed pulley 11 is rotatably installed at the top of the outer sleeve 1. A transmission cavity 12 is provided at the bottom of the outer sleeve 1. A second fixed pulley 13 is rotatably installed in the transmission cavity 12. A first movable pulley 21 and a second movable pulley 22 are respectively rotatably installed at the bottom and top of the intermediate sleeve 2. The lifting drive device 4 includes a bracket 41, a reel 42, a hand crank 43, a first winding wheel 44, a second winding wheel 45, a first winding rope 46, and a second winding rope 47 (most of the structures can be referred to in the attached Figure 2) The bracket 41 and the outer sleeve 1 are detachably and fixedly connected. The wire reel 42 is rotatably installed on the bracket 41. One end of the wire reel 42 is fixedly connected to the hand crank 43. A rotation locking mechanism 5 is provided between the hand crank 43 and the bracket 41. The first wire reel 44 and the second wire reel 45 are fixedly installed on the wire reel 42. One end of the first wire rope 46 is fixedly connected to the first wire reel 44. The other end of the first wire rope 46 is sequentially wound around the first fixed pulley 11, the first movable pulley 21, and the second movable pulley 22 and then fixedly connected to the bottom of the inner sleeve 3. One end of the second wire rope 47 is fixedly connected to the second wire reel 45. The other end of the second wire rope 47 is sequentially wound around the first fixed pulley 11 and the second fixed pulley 13 and then fixedly connected to the bottom of the inner sleeve 3.

[0021] Working principle: The main body of the lifting rod is fixedly installed on the emergency vehicle, and devices such as an antenna, a camera, and a lighting fixture are fixedly installed above the main body of the lifting rod. When it is necessary to rise, first unlock the rotation locking mechanism 5. The hand crank 43 drives the first wire reel 44 and the second wire reel 45 to rotate simultaneously through the wire reel 42. When the first wire reel 44 rotates forward to wind and tension the first wire rope 46, the second wire reel 45 rotates to relax the second wire rope 47. When the length of the first wire rope 46 shortens, it will drive the intermediate sleeve 2 and the inner sleeve 3 to extend upward through the pulley block composed of the first fixed pulley 11, the first movable pulley 21, and the second movable pulley 22, realizing the rising function. Then, after reaching the appropriate height, lock the rotation locking mechanism 5, and the wire reel 42 stops rotating to fix the height of the main body of the lifting rod.

[0022] When it is necessary to descend, first unlock the rotation locking mechanism 5. The hand crank 43 drives the first wire reel 44 and the second wire reel 45 to rotate simultaneously through the wire reel 42. When the first wire reel 44 rotates reversely to relax the first wire rope 46, the second wire reel 45 rotates to take up the second wire rope 47. When the length of the second wire rope 47 shortens, it will drive the inner sleeve 3 to descend through the pulley block composed of the first fixed pulley 11 and the second fixed pulley 13, realizing the descending function. It improves the transmission efficiency, is convenient to operate, can descend without load, has power during the descending process, does not solely rely on its own weight to descend, is not easy to cause harm, and is not easy to get stuck during the lifting process, effectively reducing the failure rate of the lifting rod during use. After descending to the appropriate height, lock the rotation locking mechanism 5, and the wire reel 42 stops rotating to fix the height of the main body of the lifting rod.

[0023] Further improvement: at the top of the outer sleeve 1, a fourth fixed pulley 14 that is symmetric about the left and right with the first fixed pulley 11 is further provided. At the bottom and top of the intermediate sleeve 2, a third movable pulley 23 and a fourth movable pulley 24 that are symmetric about the left and right with the first movable pulley 21 and the second movable pulley 22 are respectively provided. A third fixed pulley 15 is also rotatably installed in the transmission cavity 12. The lifting drive device 4 further includes a third wire rope 48. One end of the third wire rope 48 is fixedly connected to the first wire reel 44, and the other end of the third wire rope 48 is fixedly connected to the bottom of the inner sleeve 3 after sequentially winding around the first fixed pulley 11, the second fixed pulley 13, the third fixed pulley 15, the fourth fixed pulley 14, the third movable pulley 23 and the fourth movable pulley 24. The third wire rope 48 has the same function as the first wire rope 46, can share half of the gravity, improve the load-bearing capacity of the lifting rod, and make the lifting of the lifting rod smoother.

[0024] Further improvement: oil storage end caps 6 are provided at the upper part of the outer sleeve 1, the upper end of the intermediate sleeve 2 and the lower end of the transmission cavity 12. The oil storage end cap 6 is a disc-shaped hollow structure, and lubricating oil is filled inside the oil storage end cap 6. An oil outlet is provided on the end face of the oil storage end cap 6, and an oil seepage block for contacting the pulley for lubrication is provided on the oil outlet 61. The lubricating oil can be applied to the pulley through the oil seepage block for lubrication, effectively reducing the friction between the rope and the pulley, maintaining the first wire rope 46, the second wire rope 47 and the third wire rope 48 and the pulley, reducing wear, greatly extending the service life of the pulley block, and reducing the noise during the lifting and lowering of the lifting rod.

[0025] Further improvement: a first movable plug 25 that is slidably connected to the inner cavity of the outer sleeve 1 is provided at the lower end of the intermediate sleeve 2, and a second movable plug 34 that is slidably connected to the inner cavity of the intermediate sleeve 2 is provided at the lower end of the inner sleeve 3. The first fixed pulley 11 is located between the outer sleeve 1 and the intermediate sleeve 2, and the second movable pulley 22 is located between the intermediate sleeve 2 and the inner sleeve 3. Through the above scheme, components such as the first fixed pulley 11 and the second movable pulley 22 are arranged inside the lifting rod, with a compact structure, which can play a protective role and extend the service life of the lifting pulley block.

[0026] As shown in the appendix Figure 2As shown in the figure, Embodiment 2: On the basis of Embodiment 1, the rotation locking mechanism 5 includes a toothed disc 51, an inclined locking tongue 52, a return spring 53, a pull rod 54 and a bolt 55. The toothed disc 51 is sleeved outside the wire winding shaft 42 and fixedly connected to the side wall of the bracket 41. An expansion slot 56 is provided inside the hand crank. The inclined locking tongue 52 that cooperates with the toothed disc 51 is slidably installed in the expansion slot 56. A return spring 53 is provided between the inclined locking tongue 52 and the expansion slot 56. A pull rod 54 is slidably installed on the outside of the hand crank. One end of the pull rod 54 is fixedly connected to the inclined locking tongue 52. Two spaced positioning pin holes 57 are provided at one end of the pull rod 54. One end of the bolt 55 is slidably connected to the outer side wall of the hand crank, and the other end of the bolt 55 is inserted and cooperated with the two positioning pin holes 57.

[0027] When the hand crank rotates forward, the cooperation between the inclined locking tongue 52 and the toothed disc 51 plays a reverse locking role, which can prevent the lifting rod from falling and causing danger. The return spring 53 can ensure that the inclined locking tongue 52 always contacts the toothed disc 51. The two positioning pin holes 57 on the pull rod 54 can cooperate with the bolt to limit the left and right positions of the pull rod respectively. When the left end of the pull rod is limited, the inclined locking tongue 52 will not retract into the expansion slot, and the toothed disc 51 can be completely locked. When the right end of the pull rod is limited, the inclined locking tongue 52 and the toothed disc 51 are completely separated, releasing the reverse locking to ensure that the lifting rod can descend smoothly.

[0028] Furthermore, the first wire winding wheel 44 and the wire winding shaft 42 are fixedly connected, the second wire winding wheel 45 is rotatably connected to the wire winding shaft 42. A gear reversing transmission mechanism 49 is provided between the first wire winding wheel 44 and the second wire winding wheel 45. The gear reversing transmission mechanism 49 is used to make the second wire winding wheel 45 rotate in the opposite direction relative to the first wire winding wheel 44, which can reduce the volume of the lifting drive device and make the routing of the first wire rope 46 and the second wire rope 47 neater, and the lifting drive device is evenly stressed.

[0029] As shown in the attached Figure 3 figure, Embodiment 3: On the basis of Embodiment 1 or 2, a detachable base 7 is provided at the bottom of the outer sleeve 1. A control panel 71 is installed on the surface of the base 7. An electric three-jaw chuck 75 is provided at the upper part of the base 7. A fixing plate 72, an electromagnet 73 and an electric vacuum chuck 74 are provided at the lower part of the base 7. The electric three-jaw chuck 75, the electromagnet 73 and the electric vacuum chuck 74 are all electrically connected to the control panel 71. The electric three-jaw chuck 75 can clamp the bottom of the outer sleeve 1 to achieve fixation, which is convenient for disassembly and assembly. The fixing plate 72, the electromagnet 73 and the electric vacuum chuck 74 are respectively used for bolt fixation, magnetic fixation and vacuum adsorption fixation of the base 7, and can adapt to fixed installations on various different terrains.

[0030] A telescopic support rod 31 is slidably installed inside the inner sleeve 3. A support spring 32 is provided between the upper end of the telescopic support rod 31 and the inner sleeve 3, and a buffer cushion block 33 is provided between the lower end of the telescopic support rod 31 and the transmission cavity 12. The telescopic support rod, the support spring 32 and the buffer cushion block 33 have the functions of assisting and shock absorption. At the beginning stage of the rise of the lifting rod main body, the telescopic support rod 31 can pop downward under the elastic force of the support spring 32 for support, which can make the operation of rising more labor-saving and not easy to get stuck. At the last stage of the descent of the lifting rod main body, the support spring 32 compresses and stores energy, and the telescopic support rod and the buffer cushion block 33 can reduce the impact force of the equipment during descent, playing a role of shock absorption and buffering.

[0031] As shown in the Figure 4 accompanying drawings, Embodiment 4: On the basis of Embodiment 1, 2 or 3, a counterweight device 8 is provided on the lifting rod main body. The counterweight device 8 includes a U-shaped counterweight block 81 slidably sleeved on the outer sleeve 1, an annular counterweight block 82 slidably sleeved on the middle sleeve 2, a fifth fixed pulley 83 rotatably installed on the annular counterweight block 82, a fifth movable pulley 84 rotatably installed at the upper end of the inner sleeve 3, and a first counterweight rope 85 and a second counterweight rope 86. One end of the first counterweight rope 85 is fixedly connected to the U-shaped counterweight block 81, and a magnetic seat 87 is provided on the U-shaped counterweight block 81. The other end of the first counterweight rope 85 is wound around the fifth fixed pulley 83 and then fixedly connected to the lower end of the middle sleeve 2. One end of the second counterweight rope 86 is fixedly connected to the annular counterweight block 82, and the other end of the second counterweight rope 86 is wound around the fifth movable pulley 84 and then fixedly connected to the lower end of the inner sleeve 3.

[0032] When the inner sleeve 3 rises relative to the middle sleeve 2, the annular counterweight block 82 moves downward relative to the inner sleeve 3. The annular counterweight block 82 can balance the weight of the inner sleeve 3 through the second counterweight rope 86 and the fifth movable pulley 84, playing a role of making the rising operation labor-saving; when the middle sleeve 2 rises relative to the outer sleeve 1, the U-shaped counterweight block 81 moves downward relative to the middle sleeve 2. The U-shaped counterweight block 81 can balance the weight of the middle sleeve 2 through the first counterweight rope 85 and the fifth fixed pulley 83, playing a role of making the rising operation labor-saving; the magnetic seat 87 is also called a magnetic base. The magnetic base is mainly an instrument composed of a rotatable rectangular magnetic element, two magnetic yoke iron groups, and upper and lower non-magnetic blocks located between the two magnetic yoke iron groups. It is widely used in machine tool bases, machine lamp bases, workpiece fixing bases for surface grinders, etc. Rotating the knob on the magnetic seat 87 can achieve magnetic fixation or magnetic unlocking between the U-shaped counterweight block 81 and the outer sleeve 1, having a layer of insurance function, which can avoid equipment damage caused by the rapid fall when the lifting rod is damaged. The annular counterweight block 82 is actually stationary relative to the outer sleeve 1. Through the above counterweight device 8, the lifting operation can be made more labor-saving, and the maximum load capacity of the lifting rod can be adjusted by changing the weight of the counterweight block.

[0033] Although the present invention has been illustrated and described with reference to preferred embodiments, those of ordinary skill in the art will appreciate that various changes in form and detail may be made within the scope of the claims.

Claims

1. A manual lifting rod, comprising a lifting rod main body and a lifting driving device (4), wherein the lifting rod main body comprises an outer sleeve (1), an intermediate sleeve (2) and an inner sleeve (3) which are slidably sleeved in sequence from outside to inside, and is characterized in that: A first fixed pulley (11) is rotatably installed at the top of the outer sleeve (1). A transmission cavity (12) is provided at the bottom of the outer sleeve (1). A second fixed pulley (13) is rotatably installed in the transmission cavity (12). A first movable pulley (21) and a second movable pulley (22) are respectively rotatably installed at the bottom and top of the intermediate sleeve (2). The lifting drive device (4) includes a bracket (41), a wire reel (42), a hand crank (43), a first wire reel (44), a second wire reel (45), a first wire rope (46) and a second wire rope (47). The bracket (41) is detachably and fixedly connected to the outer sleeve (1). The wire reel (42) is rotatably installed on the bracket (41). One end of the wire reel (42) is fixedly connected to the hand crank (43). A rotation locking mechanism (5) is provided between the hand crank (43) and the bracket (41). The first wire reel (44) and the second wire reel (45) are fixedly installed on the wire reel (42). One end of the first wire rope (46) is fixedly connected to the first wire reel (44). The other end of the first wire rope (46) is sequentially wound around the first fixed pulley (11), the first movable pulley (21) and the second movable pulley (22) and then fixedly connected to the bottom of the inner sleeve (3). One end of the second wire rope (47) is fixedly connected to the second wire reel (45). The other end of the second wire rope (47) is sequentially wound around the first fixed pulley (11) and the second fixed pulley (13) and then fixedly connected to the bottom of the inner sleeve (3); A fourth fixed pulley (14) symmetrical to the first fixed pulley (11) about the left and right is further provided at the top of the outer sleeve (1). A third movable pulley (23) and a fourth movable pulley (24) symmetrical to the first movable pulley (21) and the second movable pulley (22) about the left and right are respectively further provided at the bottom and top of the intermediate sleeve (2). A third fixed pulley (15) is further rotatably installed in the transmission cavity (12). The lifting drive device (4) further includes a third wire rope (48). One end of the third wire rope (48) is fixedly connected to the first wire reel (44). The other end of the third wire rope (48) is sequentially wound around the first fixed pulley (11), the second fixed pulley (13), the third fixed pulley (15), the fourth fixed pulley (14), the third movable pulley (23) and the fourth movable pulley (24) and then fixedly connected to the bottom of the inner sleeve (3); The rotation locking mechanism (5) includes a toothed disc (51), an inclined locking tongue (52), a return spring (53), a pull rod (54) and a bolt (55). The toothed disc (51) is sleeved outside the wire winding shaft (42) and fixedly connected to the side wall of the bracket (41). A telescopic groove (56) is provided inside the hand crank. An inclined locking tongue (52) cooperating with the toothed disc (51) is slidably installed in the telescopic groove (56). A return spring (53) is provided between the inclined locking tongue (52) and the telescopic groove (56). A pull rod (54) is slidably installed outside the hand crank. One end of the pull rod (54) is fixedly connected to the inclined locking tongue (52). Two spaced positioning pin holes (57) are provided at one end of the pull rod (54). One end of the bolt (55) is slidably connected to the outer side wall of the hand crank, and the other end of the bolt (55) is inserted and matched with the two positioning pin holes (57). The first wire winding wheel (44) is fixedly connected to the wire winding shaft (42), and the second wire winding wheel (45) is rotatably connected to the wire winding shaft (42). A gear reversing transmission mechanism (49) is provided between the first wire winding wheel (44) and the second wire winding wheel (45). The gear reversing transmission mechanism (49) is used to make the second wire winding wheel (45) rotate in the opposite direction relative to the first wire winding wheel (44).

2. The manual lifting rod according to claim 1, characterized in that: Oil storage end covers (6) are provided on the outer sleeve (1), at the upper end of the middle sleeve (2) and at the lower end of the transmission cavity (12). The oil storage end cover (6) is a disc-shaped hollow structure. Lubricating oil is filled inside the oil storage end cover (6). An oil outlet is provided on the end face of the oil storage end cover (6), and an oil seepage block for contacting the pulley for lubrication is provided on the oil outlet.

3. A manual lifting rod according to claim 1, characterized in that: A telescopic support rod (31) is slidably installed inside the inner sleeve (3). A support spring (32) is provided between the upper end of the telescopic support rod (31) and the inner sleeve (3). A buffer cushion block (33) is provided between the lower end of the telescopic support rod (31) and the transmission cavity (12).

4. A manual lifting rod according to claim 1, characterized in that: A first movable plug (25) slidably connected to the inner cavity of the outer sleeve (1) is provided at the lower end of the middle sleeve (2). A second movable plug (34) slidably connected to the inner cavity of the middle sleeve (2) is provided at the lower end of the inner sleeve (3). The first fixed pulley (11) is located between the outer sleeve (1) and the middle sleeve (2), and the second movable pulley (22) is located between the middle sleeve (2) and the inner sleeve (3).

5. A manual lifting rod according to claim 1, characterized in that: A detachable base (7) is provided at the bottom of the outer sleeve (1). A control panel (71) is installed on the surface of the base (7). An electric three-jaw chuck (75) is provided at the upper part of the base (7). A fixing plate (72), an electromagnet (73) and an electric vacuum chuck (74) are provided at the lower part of the base (7). The electric three-jaw chuck (75), the electromagnet (73) and the electric vacuum chuck (74) are all electrically connected to the control panel (71).

6. The manual lifting rod according to claim 1, characterized in that: A counterweight device (8) is provided on the lifting rod main body. The counterweight device (8) includes a U-shaped counterweight block (81) slidably sleeved on the outer sleeve (1), an annular counterweight block (82) slidably sleeved on the middle sleeve (2), a fifth fixed pulley (83) rotatably mounted on the annular counterweight block (82), a fifth movable pulley (84) rotatably mounted at the upper end of the inner sleeve (3), and a first counterweight rope (85) and a second counterweight rope (86). One end of the first counterweight rope (85) is fixedly connected to the U-shaped counterweight block (81), and a magnetic base (87) is provided on the U-shaped counterweight block (81). The other end of the first counterweight rope (85) is wound around the fifth fixed pulley (83) and then fixedly connected to the lower end of the middle sleeve (2). One end of the second counterweight rope (86) is fixedly connected to the annular counterweight block (82), and the other end of the second counterweight rope (86) is wound around the fifth movable pulley (84) and then fixedly connected to the lower end of the inner sleeve (3).

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