A telescopic device and a control method thereof

Abstract

The present invention provides a telescopic device and a control method thereof, the telescopic device comprising: a telescopic column, the telescopic column is arranged in multiple stages, the telescopic columns of each stage are mutually sleeved, and an anti-slip mechanism is arranged between the telescopic columns of each stage; a power device, the power device is arranged in multiple stages, the power device is arranged in the telescopic column, and the power device is suitable for driving the telescopic columns of each stage to extend or retract step by step; a heavy-load locking structure, the heavy-load locking structure is arranged at the connection of the telescopic columns of adjacent stages, and is used to limit the downward retraction of the telescopic columns of each stage. Compared with the prior art, the present invention arranges a heavy-load locking device between the telescopic columns of each stage, so that the telescopic columns of each stage are locked with each other in pairs, so that the telescopic columns of each stage can directly bear the load, effectively avoiding the situation that the power device is damaged due to relying solely on the power device for bearing.

Description

Technical Field

[0001] The present invention relates to the technical field of load-bearing telescopic columns, and in particular to a telescopic device and a control method thereof. Background Art

[0002] In the prior art, the multi-stage telescopic legs only rely on the multi-stage telescopic cylinders to extend the telescopic legs at each stage and lock them under heavy load through the hydraulic system, and no load-bearing device is provided. The heavy load on the telescopic legs is completely borne by the hydraulic system. When the hydraulic system is under load for a long time or the load is too large, there is a risk of pipe bursting in the hydraulic system and hydraulic oil leakage, which may cause the telescopic legs to lose their load-bearing capacity, thereby causing a series of safety hazards and seriously affecting personal safety. Summary of the invention

[0003] The problem solved by the present invention is how to ensure the reliability of the telescopic device under long-term load-bearing state.

[0004] In order to solve the above problems, the present invention provides a telescopic device, comprising:

[0005] The telescopic column is arranged in multiple stages, the telescopic columns at each stage are mutually sleeved, and an anti-slip mechanism is arranged between the telescopic columns at each stage;

[0006] A power device, the power device is arranged in multiple stages, the power device is arranged in the telescopic column, and the power device is suitable for driving the telescopic columns of each stage to extend or retract step by step;

[0007] A heavy-load locking structure is provided at the connection between the telescopic columns at adjacent levels and is used to limit the downward retraction of the telescopic columns at each level.

[0008] Compared with the prior art, the present invention provides a heavy-load locking device between telescopic columns at each level, so that the telescopic columns at each level are locked with each other in pairs, so that the telescopic columns at each level can directly bear the load, effectively avoiding the damage of the power device caused by relying solely on the power device for bearing.

[0009] Optionally, the heavy-load locking structure includes a locking block, an inner guide rail arranged in each level of the telescopic column, and an outer guide rail arranged outside the telescopic column at each level. Adjacent telescopic columns are slidably connected by the inner guide rail and the outer guide rail. The outer guide rail is provided with a slot, and the slot is suitable for embedding the locking block. The locking block is suitable for being stuck in the inner guide rail to limit the downward movement of the telescopic column of the upper level.

[0010] Thus, heavy-load locking between telescopic columns of various levels is achieved.

[0011] Optionally, the top opening of the inner guide rail is V-shaped, and the locking block is a wedge-shaped block. When the locking block is clamped on the inner guide rail, the inclined surface of the locking block fits tightly with the inner inclined surface of the inner guide rail.

[0012] Thereby, the reliability of heavy-load locking between telescopic columns of each level is improved.

[0013] Optionally, the anti-slip mechanism is a block arranged at the bottom of the outer guide rail, and the block is suitable for abutting against the inner guide rail of the adjacent level so that the telescopic columns of each level can be extended in sequence, and when the telescopic columns descend, the telescopic columns can be descended in sequence.

[0014] Thereby, the telescopic columns of each level are prevented from being disengaged when being extended, and at the same time, the telescopic columns of each level are ensured to descend in sequence when being descended.

[0015] Optionally, the telescopic device further comprises at least one gap adjustment device, wherein the gap adjustment device is arranged on the inner wall of the telescopic column, and the gap adjustment device is suitable for adjusting the gap between the telescopic columns of adjacent stages.

[0016] Thus, the gaps between the telescopic columns at each level can be adjusted to a reasonable range, thereby ensuring that the telescopic columns at each level can be smoothly telescoped and extended while effectively transmitting the bending moment of the load.

[0017] Optionally, the gap adjustment device includes an adjusting device, an anti-friction slider and a top block, the anti-friction slider and the top block are connected to the inner walls of each level of the telescopic column, the top block is arranged between the anti-friction slider and the telescopic column, the adjusting device is suitable for being connected to the top block, and the top block is suitable for controlling the top block to move downward through the adjusting device so that the anti-friction slider is gradually pressed against the outer wall of the telescopic column of the upper level.

[0018] Thereby, it is convenient to adjust the gap between the telescopic columns at each level.

[0019] Optionally, a groove is provided on the inner wall of the telescopic column, and the anti-friction sliding block and the top block are suitable for being arranged in the groove to limit the lateral displacement of the anti-friction sliding block and the top block.

[0020] This prevents the friction-reducing slider and the top block from being displaced laterally when the telescopic columns at each level are extended and retracted, thereby preventing the originally adjusted gap position from being changed.

[0021] Optionally, the anti-friction slider has a first guiding slope, and the top block has a second guiding slope. When the top block moves downward, the second guiding slope is suitable for pressing against the first guiding slope to squeeze the anti-friction slider to move toward the outer wall of the telescopic column of the upper level.

[0022] Thereby, when the top block moves downward, it is convenient to push the anti-friction sliding block to move outward.

[0023] Optionally, the adjusting device is an adjusting screw, which is connected to the top of the top block, and is turned to raise or lower the top block.

[0024] Thereby, it is convenient to adjust the top block to rise or fall.

[0025] Optionally, a pressure shaft is provided on the outer side wall at the bottom of each level of the power device, and a convex ring extending inward is provided on the inner side wall at the bottom of each level of the telescopic column. The pressure shafts on the power devices at each level are respectively pressed on the convex rings on the telescopic columns at each level, so that the telescopic columns at each level are extended step by step in correspondence with the step-by-step extension of the power devices at each level.

[0026] Therefore, it is ensured that the telescopic columns of each level are extended in sequence correspondingly with the extension of the power devices of each level, so as to avoid the extension of the remaining telescopic columns caused by the extension of one telescopic column.

[0027] A second object of the present invention is to provide a telescopic control method, comprising:

[0028] When the telescopic columns of each level of the telescopic device are extended step by step, the telescopic columns of each level are extended outward in sequence from the innermost telescopic column, and the locking block of the heavy-load locking structure of the telescopic device is installed on the telescopic column of each extended level;

[0029] When the telescopic columns of each stage are retracted step by step, the telescopic columns of each stage are retracted inwards in sequence from the telescopic column sleeved on the outermost stage, and before each telescopic column of a stage is retracted, the locking block of the heavy-load locking structure is removed from the telescopic column of the retracted stage.

[0030] In this way, it is ensured that the telescopic columns at each level can be interlocked through the locking blocks of the heavy-load locking structure, ensuring that the telescopic device can withstand the load for a long time, and when retraction is required, the heavy-load locking structure is disassembled before each level of the telescopic column is retracted to ensure smooth retraction. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of the telescopic device in an embodiment of the present invention;

[0032] Figure 2 A cross-sectional view of the internal structure of the telescopic device in an embodiment of the present invention;

[0033] Figure 3 It is a schematic diagram of the structure of a single telescopic column and a stopper in an embodiment of the present invention;

[0034] Figure 4 It is a structural schematic diagram of a heavy-load locking structure in an embodiment of the present invention;

[0035] Figure 5 Schematic diagram of the internal structure of the gap adjustment device in the embodiment of the present invention Figure 1 ;

[0036] Figure 6 Schematic diagram of the internal structure of the gap adjustment device in the embodiment of the present invention Figure 2 ;

[0037] Figure 7 It is a schematic diagram of the structure of the pressing shaft and the convex ring in an embodiment of the present invention.

[0038] Description of reference numerals:

[0039] 1-telescopic column, 11-first-level telescopic column, 12-second-level telescopic column, 13-third-level telescopic column, 14-fourth-level telescopic column, 15-fifth-level telescopic column, 2-heavy-load locking structure, 21-locking block, 22-inner guide rail, 23-outer guide rail, 3-slot, 4-stopper, 5-gap adjustment device, 51-friction-reducing slider, 511-first guide slope, 52-top block, 521-second guide slope, 6-groove, 7-adjusting screw, 8-pressing shaft, 9-convex ring, 10-power device, 101-first-level telescopic cylinder, 102-second-level telescopic cylinder, 103-third-level telescopic cylinder, 104-fourth-level telescopic cylinder, 105-fifth-level telescopic cylinder, 100-fastening screw. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", "front", "back" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, or are the positions or positional relationships in which the invented product is usually placed when in use, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. A coordinate system XYZ is provided in the drawings of the embodiments of the present invention, wherein the positive direction of the X-axis represents the front, the reverse direction of the X-axis represents the back, the positive direction of the Y-axis represents the left, the reverse direction of the Y-axis represents the right, the positive direction of the Z-axis represents the top, and the reverse direction of the Z-axis represents the bottom.

[0043] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0044] Combination Figures 1 to 4 As shown, an embodiment of the present invention provides a telescopic device, comprising:

[0045] A telescopic column 1, wherein the telescopic column 1 is arranged in multiple stages, and the telescopic columns 1 at each stage are mutually sleeved;

[0046] A power device 10, wherein the power device 10 is arranged in multiple stages, and the power device 10 is arranged in the telescopic column 1, and the power device 10 is suitable for driving the telescopic columns 1 of each stage to extend or retract step by step;

[0047] A heavy-load locking structure 2 is provided at the connection between the telescopic columns 1 at adjacent levels, and is used to limit the telescopic columns 1 at each level from retracting downward.

[0048] Specifically, in this embodiment, the telescopic column 1 can be set to multiple levels according to actual needs. In this embodiment, a five-level telescopic column is taken as an example, and the five-level telescopic columns are sequentially arranged one on another, wherein the five-level telescopic column 151 is arranged at the bottom, and from bottom to top, they are sequentially arranged as the five-level telescopic column 151, the four-level telescopic column 141, the three-level telescopic column 131, the two-level telescopic column 121, and the one-level telescopic column 111. An anti-drop mechanism is provided between the telescopic columns 1 at each level, so that the telescopic columns 1 at each level are always connected together to prevent one of the telescopic columns 1 from falling off after being extended. The power device 10 is arranged inside the telescopic column 1, wherein the power device 10 is a multi-stage telescopic cylinder, the number of the multi-stage telescopic cylinders corresponds to the number of the telescopic column 1, and the telescopic cylinders of each stage correspond to the telescopic columns 1 of each stage in sequence, that is, the first-stage telescopic column 111 corresponds to the first-stage telescopic cylinder 101, the second-stage telescopic column 121 corresponds to the second-stage telescopic cylinder 102, the third-stage telescopic column 131 corresponds to the third-stage telescopic cylinder 103, the fourth-stage telescopic column 141 corresponds to the fourth-stage telescopic cylinder 104, and the fifth-stage telescopic column 151 corresponds to the fifth-stage telescopic cylinder 105. The top of the first telescopic cylinder 101 is connected to the first telescopic column 111, so that when the first telescopic cylinder 101 is extended, the first telescopic cylinder 101 pushes the first telescopic column 111 upward and extends synchronously. When the first telescopic cylinder 101 is extended to the right position, the second telescopic cylinder 102 continues to extend. Under the push of the second telescopic cylinder 102, the first telescopic column 111 continues to extend upward. At this time, the anti-slip mechanism between the first telescopic column 111 and the second telescopic column 121 takes effect. Under the restriction of the anti-slip mechanism, the first telescopic column 111 pulls out the second telescopic column 121, and so on, until all telescopic columns 1 at all levels are fully extended. At this time, the external load directly acts on the telescopic cylinders at all levels. In order to prevent the occurrence of situations such as pipe burst and loss of bearing capacity in the hydraulic system caused by the long-term load of the telescopic cylinders at all levels, a heavy-load locking structure 2 is set at the connection between the telescopic columns 1 at all levels. The telescopic columns 1 at all levels can bear the heavy load from above through the heavy-load locking structure 2, avoiding the situation where the telescopic cylinders at all levels directly bear the heavy load.

[0049] It should be noted that among the multi-stage telescopic oil cylinders, the bottom is the five-stage telescopic oil cylinder 105, and the top is the one-stage telescopic oil cylinder 101. From the bottom five-stage telescopic oil cylinder 105 to the top one-stage telescopic oil cylinder 101, the cylinder diameter of the telescopic oil cylinders increases successively, the cylinder diameter of the five-stage telescopic oil cylinder 105 is the smallest, and the cylinder diameter of the one-stage telescopic oil cylinder 101 is the largest. Therefore, when the multi-stage telescopic oil cylinders extend successively, the one-stage telescopic oil cylinder 101 extends first, and then the telescopic oil cylinders below extend successively. This specific principle is the existing technology in the hydraulic system and will not be described in detail here.

[0050] Combination Figures 2 to 4As shown, preferably, the heavy-duty locking structure 2 comprises a locking block 21, an inner guide rail 22 arranged inside each level of the telescopic column 1, and an outer guide rail 23 arranged outside each level of the telescopic column 1, wherein the inner guide rail 22 is arranged at the top area inside the telescopic column 1 at each level, and the length of the outer guide rail 23 is the same as the length of the telescopic column 1, and the outer guide rail 23 of the fourth-level telescopic column 141 is embedded in the inner guide rail 22 of the fifth-level telescopic column 151, and the outer guide rail 23 of the third-level telescopic column 131 is embedded in the inner guide rail 22 of the fourth-level telescopic column 141, and so on. The telescopic columns 1 at each level slide with the inner guide rail 22 and the outer guide rail 23, and the inner guide rail 22 is a rectangular long block arranged on the outer wall of the telescopic column 1 at each level and protruding outward, and the inner guide rail 22 is composed of two guide rail blocks fixed on the inner wall of the telescopic column 1 at each level, and the two guide rail blocks are symmetrically arranged with a gap in the middle to form the inner guide rail 22, and the rectangular long block is located in the gap between the two guide rail blocks, so as to realize the outer guide rail 23 sliding in the inner guide rail 22. The outer guide rail 23 is provided with a card slot 3 on both sides at the lower position. When the outer guide rail 23 moves upward in the inner guide rail 22, the card slot 3 provided below the outer guide rail 23 moves to the upper part of the inner guide rail 22, and the locking blocks 21 are respectively inserted into the card slots 3 on both sides. At this time, when the outer guide rail 23 moves downward, the locking blocks 21 on the outer guide rail 23 will be stuck on the inner guide rail 22 to prevent downward movement. In this way, the telescopic columns 1 at all levels are locked in sequence, so that the telescopic columns 1 at all levels cannot be retracted downward, and heavy-load locking is achieved.

[0051] Combination Figure 4 As shown, preferably, the top opening of the inner guide rail 22 is V-shaped, and the locking block 21 is a wedge-shaped block. When the locking block 21 is located in the inner guide rail 22, the inclined surfaces of the locking block 21 in the left and right slots 3 are tightly fitted with the two V-shaped side surfaces of the inner guide rail 22. At this time, by utilizing the principle of the wedge, when the telescopic column 1 is loaded, the locking block 21 becomes tighter and tighter in the inner guide rail 22, thereby ensuring the reliability of the load-bearing of the telescopic column 1.

[0052] Combination Figure 4 As shown, in this embodiment, the anti-slip mechanism is a stopper 4 arranged at the bottom of the outer guide rail 23, and the width of the stopper 4 is greater than the width of the outer guide rail 23. At this time, the outer guide rail 23 moves upward in the inner guide rail 22 until the stopper 4 arranged at the bottom of the outer guide rail 23 abuts against the bottom of the inner guide rail 22, so that the telescopic columns 1 of each stage are extended in sequence, and when the telescopic columns 1 are lowered, the telescopic columns 1 are lowered in sequence.

[0053] In a specific embodiment, when the first-level telescopic cylinder 101 is extended, it drives the first-level telescopic column 111 to extend upward. At this time, the outer guide rail 23 of the first-level telescopic column 111 moves upward in the inner guide rail 22 of the second-level telescopic column 121. When the first-level telescopic column 111 is extended into place, the top of the stopper 4 set at the bottom of the outer guide rail 23 of the first-level telescopic column 111 just abuts against the bottom of the inner guide rail 22 set in the second-level telescopic column 121. When the second-level telescopic cylinder 102 is extended, it pushes the first-level telescopic column 111 to continue to move upward. At this time, the first-level telescopic column 111 has been extended into place. Under the restriction of the stopper 4 set at the bottom of the outer guide rail 23 of the first-level telescopic column 111, the first-level telescopic column 111 pulls the second-level telescopic column 121 upward through the stopper 4, thereby extending the second-level telescopic column 121. By analogy, the telescopic columns 1 of each level are extended in sequence. When the telescopic columns 1 of each level need to be retracted, the four-stage telescopic cylinder 104 retracts downward, and the four-stage telescopic column 141 corresponding to the four-stage telescopic cylinder 104 begins to retract downward. Since the upper one-stage telescopic cylinder 101 is connected to the one-stage telescopic column 111, the one-stage telescopic cylinder 101 can support the one-stage telescopic column 111. At this time, the bottom stopper 4 of the outer guide rail 23 of the one-stage telescopic column 111 is stuck at the bottom of the inner guide rail 22 of the two-stage telescopic column 121, that is, the one-stage telescopic column 111 pulls the two-stage telescopic column 121 to bear the dead weight of the two-stage telescopic column 121, and so on. The one-stage telescopic column 111 to the three-stage telescopic column 131 will not fall down suddenly. Until the four-stage telescopic column 141 is retracted into place, the three-stage telescopic cylinder 103 retracts downward, and the three-stage telescopic column 131 retracts downward accordingly. The one-stage telescopic column 111 and the two-stage telescopic column 121 remain, and so on, until the telescopic columns 1 of each level are completely retracted.

[0054] Combination Figure 5 and Figure 6 As shown, preferably, the telescopic device further includes a gap adjustment device 5, which is arranged on the inner wall of each level of the telescopic column 1, and is used to adjust the gap between each level of the telescopic column 1, so that the gap between each level of the telescopic column 1 is adjusted to a suitable range, ensuring that the telescopic column 1 at each level can effectively transmit the bending moment of the load while maintaining the smoothness of the telescopic column 1 at each level during the telescopic process. It should be noted that the gap adjustment device 5 can be arranged in various directions of the inner wall of the telescopic column 1 according to needs, thereby improving stability.

[0055] Combination Figure 5 and Figure 6As shown, preferably, the gap adjustment device 5 includes an adjustment device, a friction-reducing slider 51 and a top block 52, wherein the friction-reducing slider 51 and the top block 52 are suitable for being fixed to the inner wall of each level of telescopic column 1 by fastening screws 100, wherein the top block 52 is arranged between the friction-reducing slider 51 and the inner wall of the telescopic column 1, the friction-reducing slider 51 is fitted with the outer wall of the upper telescopic column 111, and the top block 52 is connected to the adjustment device, and the top block 52 can be controlled to move downward or upward by the adjustment device, and when the top block 52 moves downward, the top block 52 gradually inserts between the friction-reducing slider 51 and the inner wall of the telescopic column 1, so that the friction-reducing slider 51 is squeezed by the top block 52 and gradually presses against the outer wall of the upper telescopic column 111. On the contrary, when the top block 52 moves upward, the pressing force of the friction-reducing slider 51 on the outer wall of the upper telescopic column 111 gradually decreases. Thus, the gap adjustment between adjacent telescopic columns 1 is realized, and the gap can be quickly and conveniently adjusted to a suitable position. It should be noted that at least one of the contact surfaces between the top block 52 and the anti-friction slider 51 is provided with an inclined surface or an arc surface, so that as the top block 52 moves downward, the anti-friction slider 51 is pressed against the outer wall of the telescopic column 1 of the upper level.

[0056] Combination Figure 5 As shown, specifically, in this embodiment, the anti-friction slider 51 has a first guiding bevel 511, and the top block 52 has a second guiding bevel 521. The cross-section of the anti-friction slider 51 is an equilateral triangle, and the cross-section of the top block 52 is an inverted triangle. The first guiding bevel 511 fits with the second guiding bevel 521. As the top block 52 moves downward, it is convenient to push the anti-friction slider 51 to press against the outer wall of the upper telescopic column 111. The principle is the same as the wedge principle.

[0057] Combination Figure 5 and Figure 6 As shown, preferably, a groove 6 is provided on the inner wall of the telescopic column 1, and the anti-friction slider 51 and the top block 52 are both arranged in the groove 6, and the two side surfaces of the anti-friction slider 51 and the top block 52 are respectively fitted with the two side vertical surfaces of the groove 6, so as to effectively avoid the lateral displacement of the anti-friction slider 51 and the top block 52 during the telescopic process of each level of telescopic columns 1, thereby affecting the telescopic effect between each level of telescopic columns 1.

[0058] Combination Figure 6 As shown, preferably, the adjusting device is an adjusting screw 7, which is connected to the top of the top block 52. The top block 52 can be raised and lowered by turning the adjusting screw 7, which is convenient for adjustment.

[0059] Combination Figure 7As shown, in another embodiment, the bottom outer side wall of each stage of the power device 10 is provided with a pressure shaft 8 protruding outward, and the bottom inner wall of each stage of the telescopic column 1 is provided with a convex ring 9 extending outward. When all telescopic columns 1 are in the unextended state, the pressure shaft 8 on each stage of the power device 10 is pressed on the convex ring 9 of each stage of the telescopic column 1. Specifically, when the primary telescopic cylinder 101 drives the primary telescopic column 111 to extend upward, the secondary telescopic cylinder 102 is not extended at this time, and the pressure shaft 8 provided on the secondary telescopic cylinder 102 is pressed on the convex ring 9 of the telescopic column 1, so that the secondary telescopic column 121 is effectively prevented from extending when the primary telescopic column 111 extends, thereby ensuring that the primary telescopic cylinder 101 extends when the primary telescopic cylinder 101 extends, and the secondary telescopic cylinder 102 extends when the secondary telescopic cylinder 102 extends, until all the telescopic columns 1 at each stage are extended in sequence. On the contrary, when retracting, when the telescopic oil cylinders of each level are descending, the pressing shaft 8 on the telescopic oil cylinders presses the convex ring 9 of the corresponding telescopic column 1, and as the telescopic oil cylinder of that level descends, the telescopic column 1 of that level is pressed downward to achieve the retraction of the telescopic column 1 of that level, until the retraction of the telescopic columns 1 of each level is completed in sequence. It should be noted that the pressing shaft 8 can be set to multiple to ensure stability.

[0060] A telescopic control method according to another embodiment of the present invention is based on the telescopic device as described above, and the method comprises the following steps:

[0061] When the telescopic columns 1 of each level of the telescopic device are extended step by step, the telescopic columns 1 of each level are extended outward in sequence from the innermost telescopic column 1, and the locking block 21 of the heavy-load locking structure 2 of the telescopic device is installed on the telescopic column 1 of the extended level at each level of the telescopic column 1;

[0062] When the telescopic columns 1 of each level are retracted step by step, the telescopic columns 1 of each level are retracted inward in sequence from the telescopic column 1 sleeved on the outermost level, and before each telescopic column 1 is retracted, the locking block 21 of the heavy-load locking structure 2 is removed from the telescopic column 1 of the retracted level.

[0063] Thus, taking the five-stage telescopic column as an example, the five-stage telescopic columns are mutually nested in sequence, wherein the five-stage telescopic column 151 is arranged at the bottom, and from bottom to top, they are arranged in sequence as the five-stage telescopic column 151, the four-stage telescopic column 141, the three-stage telescopic column 131, the two-stage telescopic column 121 and the one-stage telescopic column 111. A power device 10 is arranged in the five-stage telescopic column, and the power device 10 is multi-stage. Taking the telescopic oil cylinder as an example of the power device, a multi-stage telescopic oil cylinder is arranged in the five-stage telescopic column, and the number of stages of the multi-stage telescopic oil cylinder corresponds to the number of stages of the telescopic column 1, and the telescopic oil cylinders of each stage correspond to the telescopic column 1 of each stage in sequence, that is, the one-stage telescopic column 111 corresponds to the one-stage telescopic oil cylinder 101, the two-stage telescopic oil cylinder 121 corresponds to the two-stage telescopic oil cylinder 102, the three-stage telescopic column 131 corresponds to the three-stage telescopic oil cylinder 103, the four-stage telescopic column 141 corresponds to the four-stage telescopic oil cylinder 104, and the five-stage telescopic column 151 corresponds to the five-stage telescopic oil cylinder 105. Among them, the top of the first-level telescopic cylinder 101 is connected to the first-level telescopic column 111.

[0064] When the telescopic columns 1 of each level are extended, the first-level telescopic cylinder 101 is extended first, and the innermost first-level telescopic column 111 is pushed out first. After the first-level telescopic column 111 is extended, the locking block 21 is inserted into the slot 3 provided in the outer guide rail 23 of the first-level telescopic column 111, so that the locking block 21 can be stuck in the inner guide rail 23 of the second-level telescopic column 121 when it is lowered under heavy load, so as to achieve locking between the first-level telescopic column 111 and the second-level telescopic column 121, and the first-level telescopic column 111 cannot be retracted again, and so on, so as to achieve mutual locking between the telescopic columns 1 of each level, so as to effectively bear heavy loads and avoid damage caused by long-term heavy load bearing of the power device 10. When the telescopic columns 1 of each level are retracted, the four-stage telescopic cylinder 104 will be retracted first. At this time, the locking block 121 on the four-stage telescopic column 141 is first removed, so that the four-stage telescopic column 141 is retracted into the five-stage telescopic column 151, and the three-stage telescopic column 131 is retracted into the four-stage telescopic column 141, and so on, the telescopic columns 1 of each level are retracted from the outside to the inside in sequence.

[0065] Although the disclosure is disclosed as above, the protection scope of the disclosure is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the protection scope of the present invention.

[0066] In the description of this specification, the description with reference to the terms "embodiment", "one embodiment" and "one implementation" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or implementation are included in at least one embodiment or implementation of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or implementation. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or implementations in a suitable manner.

[0067] 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 by equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A telescopic device, characterized in that: include: A telescopic column (1), wherein the telescopic column (1) is arranged in multiple stages, the telescopic columns (1) at each stage are mutually sleeved, and an anti-slip mechanism is arranged between the telescopic columns (1) at each stage; A power device (10), the power device (10) being arranged in multiple stages, the power device (10) being arranged in the telescopic column (1), and the power device (10) being suitable for driving each stage of the telescopic column (1) to extend or retract step by step; A heavy-load locking structure (2), the heavy-load locking structure (2) being arranged at the connection between the telescopic columns (1) at adjacent levels, and being used to limit the downward retraction of the telescopic columns (1) at each level; The heavy-load locking structure (2) comprises a locking block (21), an inner guide rail (22) arranged inside each level of the telescopic column (1), and an outer guide rail (23) arranged outside each level of the telescopic column (1); adjacent telescopic columns (1) are slidably connected by the inner guide rail (22) and the outer guide rail (23); the outer guide rail (23) is provided with a slot (3); the slot (3) is suitable for embedding the locking block (21); the locking block (21) is suitable for being stuck in the inner guide rail (22) to limit the downward movement of the telescopic column (1) at the previous level; The top opening of the inner guide rail (22) is V-shaped, and the locking block (21) is a wedge-shaped block. When the locking block (21) is stuck on the inner guide rail (22), the inclined surface of the locking block (21) is tightly fitted with the inner inclined surface of the inner guide rail (22); The anti-slip mechanism is a stopper (4) arranged at the bottom of the outer guide rail (23), and the stopper (4) is suitable for abutting against the inner guide rail (22) of the adjacent level, so that the telescopic columns (1) of each level are sequentially extended, and when the telescopic columns (1) are lowered, the telescopic columns (1) are lowered in sequence.

2. The telescopic device according to claim 1, characterized in that: It also comprises at least one gap adjustment device (5), wherein the gap adjustment device (5) is arranged on the inner wall of the telescopic column (1), and the gap adjustment device (5) is suitable for adjusting the gap between adjacent levels of the telescopic columns (1).

3. The telescopic device according to claim 2, characterized in that: The gap adjustment device (5) comprises an adjustment device, a friction-reducing slider (51) and a top block (52); the friction-reducing slider (51) and the top block (52) are connected to the inner walls of the telescopic columns (1) at each level; the top block (52) is arranged between the friction-reducing slider (51) and the inner wall of the telescopic column (1); the adjustment device is suitable for being connected to the top block (52); the top block (52) is suitable for being controlled by the adjustment device to move downward so that the friction-reducing slider (51) is gradually pressed against the outer wall of the telescopic column (1) at the upper level.

4. The telescopic device according to claim 3, characterized in that: The inner wall of the telescopic column (1) is provided with a groove (6), and the anti-friction slider (51) and the top block (52) are suitable for being arranged in the groove (6) to limit the lateral displacement of the anti-friction slider (51) and the top block (52).

5. The telescopic device according to claim 3, characterized in that: The anti-friction sliding block (51) has a first guiding inclined surface (511), and the top block (52) has a second guiding inclined surface (521). When the top block (52) moves downward, the second guiding inclined surface (521) is suitable for pressing against the first guiding inclined surface (511) to squeeze the anti-friction sliding block (51) to move toward the outer wall of the telescopic column (1) at the upper level.

6. The telescopic device according to claim 1, characterized in that: A pressing shaft (8) is arranged on the outer side wall of the bottom of each stage of the power device (10), and a convex ring (9) extending inward is arranged on the inner side wall of the bottom of each stage of the telescopic column (1). The pressing shaft (8) on each stage of the power device (10) is pressed on the convex ring (9) on each stage of the telescopic column (1) respectively, so that the telescopic column (1) is extended step by step in correspondence with the step-by-step extension of the power device (10) at each stage.

7. A telescopic control method, characterized in that: Based on the telescopic device according to any one of claims 1 to 6, comprising the steps of: When the telescopic columns (1) of the telescopic device are extended step by step, the telescopic columns (1) of each level are extended outwards in sequence from the innermost telescopic column (1), and each time the telescopic column (1) is extended, a locking block (21) of the heavy-load locking structure (2) of the telescopic device is assembled on the telescopic column (1) of the extended level; When the telescopic columns (1) of each stage are retracted step by step, the telescopic columns (1) of each stage are retracted inwards in sequence from the telescopic column (1) sleeved on the outermost stage, and before each telescopic column (1) is retracted, the locking block (21) of the heavy-load locking structure (2) is removed from the telescopic column (1) of the retracted stage.

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