A telescopic lifting device

Abstract

This invention relates to a retractable lifting device. A fixed beam is fixedly installed on a factory beam outside the inspection door of a vertical shaft furnace, pointing towards the furnace. A telescopic beam is movably connected to the fixed beam, with the telescopic beam installed in the same direction. The telescopic beam can move closer to or further away from the furnace, and the sum of the lengths of the telescopic beam and the fixed beam is greater than the distance between the factory beam and the furnace. This design allows the telescopic beam to extend and retract, extending into the furnace for maintenance and retracting when not under maintenance. This eliminates the need for temporary single-beam installation during maintenance, saving time and improving efficiency. Furthermore, the retracted beam is unaffected by the high temperature of the furnace, reducing the risk of beam deformation and improving equipment safety.

Description

Technical Field

[0001] This invention relates to the field of metal smelting equipment technology, and in particular to a telescopic lifting device. Background Technology

[0002] A vertical shaft furnace is a metallurgical device with an upright furnace body that uses waste gas to preheat materials. It is widely used in industries such as iron and steel and non-ferrous metals. Depending on its application, vertical shaft furnaces can be divided into several types, mainly including blast furnaces for ironmaking, pelletizing vertical shaft furnaces, hydrogen-based vertical shaft furnaces, and preheating vertical shaft furnaces for preheating scrap steel in electric arc furnaces. During maintenance of a vertical shaft furnace, refractory materials need to be moved to the top of the furnace for lining. This design incorporates a retractable lifting device to facilitate the movement of refractory materials and maintenance supplies during maintenance, reducing maintenance time, improving efficiency, and ensuring greater safety and reliability.

[0003] Vertical shaft furnaces are widely used in China, but to eliminate potential operational hazards, improve performance, and extend service life, these furnaces require regular systematic inspection and maintenance. Currently, the method used for transporting materials and refractory materials during furnace maintenance is as follows: After the furnace has completely cooled, a beam is erected, connecting one side to the furnace and the other side, through an inspection door, to the external plant beam. A monorail trolley and electric chain hoist are then used in combination. The monorail trolley moves back and forth on the erected beam, while the electric chain hoist moves up and down, thus transporting the materials and refractory materials into the furnace. After maintenance, the erected beam, hoist, and trolley are dismantled before test-firing and feeding. However, this method is inefficient, requiring significant time for installation and dismantling before and after each maintenance, and improper installation poses a considerable risk. Another method involves using a fixed beam, a monorail trolley, and a chain electric hoist together. Due to the long-term high-temperature exposure inside the vertical furnace, the fixed beam may deform and its shear force may decrease. If not properly inspected, this could cause the chain electric hoist to fall off.

[0004] The above problems urgently need to be addressed. Summary of the Invention

[0005] This invention discloses a telescopic lifting device, which aims to solve the technical problems existing in the prior art.

[0006] The present invention adopts the following technical solution: a fixed beam, which is fixedly installed on the factory building beam outside the vertical furnace maintenance door, and is set in the direction of the factory building beam pointing towards the vertical furnace; a telescopic beam, which is movably connected to the fixed beam, and the telescopic beam is installed in the same direction as the fixed beam. The telescopic beam can be close to or away from the vertical furnace, and the sum of the length of the telescopic beam and the length of the fixed beam is greater than the distance between the factory building beam and the vertical furnace.

[0007] Optionally, a traveling assembly is provided between the fixed beam and the telescopic beam. The traveling assembly is fixedly connected to the telescopic beam and movably connected to the fixed beam. The traveling assembly drives the telescopic beam to move parallel to the installation direction of the fixed beam.

[0008] Optionally, the walking assembly includes: a connecting rod, fixedly installed on the telescopic beam; and a walking wheel, installed on the connecting rod and overlapping the fixed beam, wherein the fixed beam is an I-beam structure and the walking wheel is placed between the two crossbeams of the I-beam.

[0009] Optionally, the walking assembly includes two sets, each set including the connecting rod and the walking wheel; at least one set of walking assemblies is connected to a drive device to drive the walking assembly to move along the extension direction of the fixed beam.

[0010] Optionally, the driving device is a drive motor, the traveling wheel is a pulley, the housing of the drive motor is fixedly mounted on the connecting rod, and the output shaft of the drive motor is connected to the traveling wheel.

[0011] Optionally, the driving device is a rotary motor and a chain. The chain is laid on the lower crossbeam of the fixed beam I-beam. The traveling wheel is a small gear. A large gear is installed on the output shaft of the rotary motor. The chain passes around the large gear and is tightened. The small gear meshes with the chain.

[0012] Optionally, the height of the middle position of the I-beam of the fixed beam is greater than the diameter of the traveling wheel.

[0013] Optionally, an anti-tipping support is provided on the side of the telescopic beam near the factory beam. The anti-tipping support is installed between the telescopic beam and the fixed beam. The first height of the anti-tipping support is the same as the second height between the telescopic beam and the fixed beam.

[0014] Optionally, an anti-tipping wheel is provided at one end of the anti-tipping support near the fixed beam. The anti-tipping wheel contacts the lower end of the fixed beam and travels along the lower end of the fixed beam.

[0015] Optionally, an electric hoist is installed at the lower end of the telescopic beam, and a hoist moving pulley is provided between the telescopic beam and the electric hoist to drive the electric hoist to move horizontally along the installation direction of the telescopic beam; a hook is installed at the lower end of the electric hoist, and the electric hoist drives the hook to move up and down.

[0016] The technical solution adopted in this invention can achieve at least one of the following beneficial effects: In this embodiment of the invention, a fixed beam is fixedly installed on the factory beam outside the vertical furnace maintenance door, with the factory beam pointing towards the vertical furnace. A telescopic beam is movably connected to the fixed beam, and the telescopic beam is installed in the same direction as the fixed beam. The telescopic beam can move closer to or further away from the vertical furnace. The sum of the length of the telescopic beam and the length of the fixed beam is greater than the distance between the factory beam and the vertical furnace. This achieves the purpose of setting up a telescopic beam that can extend and retract, allowing it to extend into the vertical furnace for maintenance and retract when the furnace is not under maintenance. This eliminates the need to temporarily erect a single beam during maintenance, saving maintenance time and improving maintenance efficiency. At the same time, after retraction, it is not affected by the high temperature of the vertical furnace, reducing the risk of beam deformation and improving equipment safety. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below, forming part of the present invention. The illustrative embodiments of the present invention and their descriptions explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings: Figure 1 This is a structural diagram of a retractable lifting device according to the present invention; Figure 2 This is a diagram of the pulley travel structure of a retractable lifting device according to the present invention; Figure 3 This is a chain-driven structure diagram of a retractable lifting device according to the present invention.

[0018] Explanation of reference numerals in the attached figures: 1. Fixed beam; 2. Telescopic beam; 3. Walking assembly; 31. Connecting rod; 32. Walking wheel; 4. Drive motor; 51. Chain; 52. Pinion; 6. Anti-tipping support; 61. Anti-tipping wheel; 7. Electric hoist; 71. Hoist moving pulley; 8. Hook. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. In the description of this invention, it should be noted that the term "or" is generally used to include the meaning of "and / or," unless otherwise expressly indicated.

[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or a magnetic connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Furthermore, in the description of this application, the terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance. In the description of this invention, "a plurality of" means at least two, such as two, three, or more, unless otherwise explicitly specified.

[0021] Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] To address the problems existing in related technologies, this application provides a telescopic lifting device.

[0023] like Figure 1 As shown, Figure 1 This is a structural diagram of a retractable lifting device according to the present invention, the device comprising: Fixed beam 1 is fixedly installed on the factory building beam outside the vertical furnace inspection door, and is set in the direction of the factory building beam pointing towards the vertical furnace; telescopic beam 2 is movably connected to fixed beam 1, and the installation direction of telescopic beam 2 is the same as that of fixed beam 1. Telescopic beam 2 can be close to or away from the vertical furnace, and the sum of the length of telescopic beam 2 and the length of fixed beam 1 is greater than the distance between the factory building beam and the vertical furnace.

[0024] Optionally, the fixed beam 1 serves as the fixed base structure for the device, employing a fixed installation method involving bolt fastening, welding, or clamp locking. It is securely mounted on the pre-installed plant beam outside the vertical furnace maintenance door, with the installation position directly aligned with the center of the vertical furnace maintenance door. The fixed beam 1 is strictly laid out along the horizontal direction of the plant beam towards the vertical furnace body, maintaining an overall horizontal and parallel state without tilting or offset. This provides a stable and precise guiding foundation and load-bearing support for the subsequent telescopic movement of the telescopic beam 2, capable of withstanding the working loads of maintenance personnel and tools, and ensuring the stability of the overall structure.

[0025] The telescopic beam 2 and the fixed beam 1 adopt a nested, sliding rail, or screw-driven movable connection structure. They maintain a coaxial and unidirectional installation layout, with the installation direction completely consistent with the fixed beam 1. They always reciprocate in a straight line along the horizontal direction pointing towards the vertical furnace. Based on this movable connection structure, the telescopic beam 2 can precisely extend towards the vertical furnace body and retract away from it. The extension stroke can be flexibly adjusted according to the internal maintenance depth of the vertical furnace body and the distance between the plant beams and the vertical furnace.

[0026] Specifically, when using a sliding rail structure, the telescopic beam 2 is set below the fixed beam 1 and suspended on the fixed beam 1 by the walking component 3. After being powered on, the walking component 3 moves on the fixed beam 1 above, realizing the telescopic function of the telescopic beam 2. This effectively solves the problem of welding and installing beams for each traditional maintenance, and it can be extended and retracted at any time. Even if the maintenance door position needs to be temporarily cleared during the maintenance process, it can be moved immediately, providing convenience for maintenance.

[0027] Specifically, when using a nested structure, the fixed beam 1 can be set as a rectangular hollow tube, the telescopic beam 2 is set inside the rectangular telescopic tube, and a push cylinder is set inside the fixed beam 1 so that the telescopic beam 2 is pushed out from inside the rectangular hollow tube to the outside, thereby achieving the telescopic effect.

[0028] Optionally, the sum of the fixed length of the fixed beam 1 and the maximum extension length of the telescopic beam 2 must be strictly greater than the straight-line distance from the plant beam to the side wall of the vertical furnace and the maintenance area inside the furnace cavity. This structural design ensures that when the telescopic beam 2 is fully extended, it can stably penetrate the vertical furnace maintenance door and extend to the designated maintenance work area inside the furnace cavity, completely covering the work locations requiring maintenance, such as the furnace lining, furnace wall components, and internal transmission parts. This provides reliable work support and an operating platform for various maintenance operations, such as equipment inspection, parts replacement, fault repair, and material cleaning.

[0029] In some preferred embodiments, a traveling assembly 3 is provided between the fixed beam 1 and the telescopic beam 2. The traveling assembly 3 is fixedly connected to the telescopic beam 2 and movably connected to the fixed beam 1. The traveling assembly 3 drives the telescopic beam 2 to move parallel to the installation direction of the fixed beam 1.

[0030] Optionally, a traveling assembly 3 is installed between the telescopic beam 2 and the fixed beam 1. The traveling assembly 3 and the telescopic beam 2 are fixedly connected by bolts and welding to form an integrated fixed connection structure. At the same time, the traveling assembly 3 and the fixed beam 1 are in a movable and adaptable connection state, and can slide parallel along the fixed beam 1 without jamming. The matching installation direction of the traveling assembly 3, the telescopic beam 2, and the fixed beam 1 is kept highly consistent, and the whole assembly is arranged in the horizontal direction of the plant beams pointing towards the vertical furnace. Through the power transmission and guiding and limiting function of the traveling assembly 3, the telescopic beam 2 can be precisely driven to make a smooth linear reciprocating translational movement along the installation direction of the fixed beam 1, thereby realizing the extension movement of the telescopic beam 2 towards the vertical furnace body and the retraction movement away from the vertical furnace body. The telescopic drive is achieved by the independent traveling assembly 3, which has higher guiding accuracy and stronger operational stability. The telescopic stroke can be flexibly adapted and adjusted according to the internal maintenance depth of the vertical furnace body and the distance between the plant beams and the vertical furnace, effectively avoiding problems such as jamming, deviation, and shaking during the telescopic process.

[0031] In some preferred embodiments, the walking assembly 3 includes: a connecting rod 31, which is fixedly installed on the telescopic beam 2; and a walking wheel 32, which is installed on the connecting rod 31 and overlaps the fixed beam 1. The fixed beam 1 is an I-beam structure, and the walking wheel 32 is placed between the two crossbeams of the I-beam.

[0032] Optionally, the walking assembly 3 includes two main structural components: a connecting rod 31 and a walking wheel 32. The connecting rod 31 is vertically fixed to the upper end of the telescopic beam 2 by bolts and welding, forming an integral fixed structure with the telescopic beam 2. There is no relative displacement or loosening gap, ensuring high connection reliability. The upper end of the connecting rod 31 is rotatably fitted with the walking wheel 32, which is directly mounted on the fixed beam 1 and can roll freely along the upper surface of the lower I-beam of the fixed beam 1.

[0033] Optionally, the fixed beam 1 adopts a standard I-beam structure. The I-beam itself has an integrated structure of upper and lower parallel crossbeams and a middle web. The traveling wheel 32 is precisely placed and engaged in the limiting groove between the upper and lower crossbeams of the I-beam. Relying on the crossbeams of the I-beam to form limiting constraints on both sides, the lateral offset and movement of the traveling wheel 32 are effectively restricted. The traveling assembly 3 is installed in a direction that is highly consistent with the matching installation direction of the telescopic beam 2 and the fixed beam 1. The whole assembly is arranged in the horizontal direction of the plant beams pointing towards the vertical furnace. By the rolling movement of the traveling wheel 32 in the groove of the fixed beam 1, the telescopic beam 2 can be precisely and smoothly driven to make a stable linear reciprocating translational movement along the installation direction of the fixed beam 1. This realizes the extension movement of the telescopic beam 2 towards the vertical furnace body and the retraction movement away from the vertical furnace body. The walking component 3 structure, which combines I-beams with walking wheels 32, offers higher guiding accuracy, lower running resistance, and stronger telescopic stability. It can completely avoid problems such as jamming, deviation, and shaking during telescopic movement. Moreover, it has a simple structure, strong load-bearing capacity, and convenient maintenance. The telescopic stroke can be flexibly adjusted according to the internal maintenance depth of the vertical furnace body and the distance between the plant beams and the vertical furnace.

[0034] In some preferred embodiments, the walking assembly 3 includes two sets, each set of walking assemblies 3 including a connecting rod 31 and a walking wheel 32; at least one set of walking assemblies 3 is connected to a drive device to drive the walking assembly 3 to move along the extension direction of the fixed beam 1.

[0035] Optionally, two sets of walking components 3 are symmetrically arranged. The two sets of walking components 3 have the same structure. Each set of walking components 3 includes a corresponding connecting rod 31 and a walking wheel 32. The two sets of walking components 3 are arranged along the length of the telescopic beam 2, which can form a dual-point support and guidance for the telescopic beam 2, effectively improving the overall balance and load-bearing stability of the telescopic beam 2 during the translation process.

[0036] Simultaneously, at least one of the two sets of traveling components 3 is equipped with a drive device. This drive device is securely mounted on the corresponding connecting rod 31 or the bottom of the telescopic beam 2, and can output horizontal driving force to drive the entire traveling component 3 to move linearly along the extension direction of the fixed beam 1. The power drive of the drive device provides stable power for the rolling translation of the traveling wheels 32, thereby precisely driving the telescopic beam 2 to make a smooth linear reciprocating translational movement along the installation direction of the fixed beam 1, thus realizing the automatic extension action of the telescopic beam 2 towards the vertical furnace body and the automatic retraction action away from the vertical furnace body.

[0037] In addition, the drive unit on the walking component 3 can be powered by a safety sliding contact line. Specifically, the safety sliding contact line is fixedly laid on the side or bottom of the I-beam fixed beam 1 and is laid along the entire extension direction of the fixed beam 1. The drive unit is equipped with a current collector structure. The current collector and the safety sliding contact line always maintain dynamic contact and can be powered continuously throughout the entire extension stroke of the telescopic beam 2. This effectively avoids the safety hazards of cable pulling, tangling, wear, aging and breakage that exist in traditional cable drag power supply. It is suitable for the harsh working environment of high temperature and dust in the furnace, and the power supply stability and safety are higher.

[0038] In some preferred embodiments, the driving device is a drive motor 4, the traveling wheel 32 is a pulley, the housing of the drive motor 4 is fixedly mounted on the connecting rod 31, and the output shaft of the drive motor 4 is connected to the traveling wheel 32. Figure 2 As shown, Figure 2 This is a diagram of the pulley travel structure of a telescopic lifting device according to the present invention.

[0039] In some preferred embodiments, the drive device is a rotary motor and a chain 51. The chain 51 is laid on the lower crossbeam of the I-beam of the fixed beam 1. The traveling wheel 32 is a small gear 52. A large gear is installed on the output shaft of the rotary motor. The chain 51 is stretched around the large gear, and the small gear 52 meshes with the chain 51. Figure 3 As shown, Figure 3 This is a diagram of the chain 51 traveling structure of a telescopic lifting device according to the present invention. The rotating motor and the large gear are both installed at the left end of the fixed beam 1.

[0040] In some preferred embodiments, the height of the middle position of the I-beam of the fixed beam 1 is greater than the diameter of the traveling wheel 32.

[0041] Optionally, the height of the middle position of the I-beam of the fixed beam 1 is greater than the overall diameter of the traveling wheel 32. This size matching ensures that when the traveling wheel 32 rolls between the lower crossbeams of the I-beam, the top of the wheel body and the bottom surface of the upper crossbeam of the I-beam are always kept in a gap, completely avoiding contact friction between the traveling wheel 32 and the upper crossbeam of the I-beam, effectively reducing the running resistance of the traveling wheel 32 during the rolling process, reducing mechanical wear and jamming, and further improving the smoothness and stability of the reciprocating movement of the telescopic beam 2.

[0042] In some preferred embodiments, an anti-tipping support 6 is provided on the side of the telescopic beam 2 near the factory beam. The anti-tipping support 6 is installed between the telescopic beam 2 and the fixed beam 1. The first height of the anti-tipping support 6 is the same as the second height between the telescopic beam 2 and the fixed beam 1.

[0043] Optionally, when the hoist on the telescopic beam 2 is hoisting a heavy object, the telescopic beam 2 will tilt due to the weight, especially when most of the length of the telescopic beam 2 is extended. At this time, the front traveling component 3 is detached from the fixed beam 1, and the rear traveling component 3 has less support, which will cause the rear traveling wheel 32 to slip in the air. Therefore, an anti-tipping support 6 is added. The anti-tipping support 6 can travel at the bottom of the crossbeam under the fixed beam 1 to prevent the telescopic beam 2 from tilting.

[0044] An anti-tipping support 6 is added to the side of the telescopic beam 2 closest to the factory beam. This anti-tipping support 6 is integrally assembled between the telescopic beam 2 and the fixed beam 1, and its first height is consistent with the second height between the telescopic beam 2 and the fixed beam 1, ensuring that the anti-tipping support 6 can effectively support the bottom of the fixed beam 1. During actual maintenance operations, after the telescopic beam 2 extends outward, workers typically use a hoist to lift heavy objects. At this time, the front end of the telescopic beam 2, under the load of the heavy object, will experience an unbalanced load and tilting tendency, easily causing the traveling wheel 32 of the rear traveling component 3 to be suspended in the air. This can lead to problems such as slippage of gears and chains 51, transmission failure, and beam swaying and displacement, seriously affecting operational safety and telescopic accuracy. The anti-tipping support 6 effectively counteracts the unbalanced load moment generated by the lifting of the front end of the telescopic beam 2, limits the tilting amplitude of the telescopic beam 2, completely avoids the defect of the traveling wheel 32 being suspended in the air, and significantly improves the overall structural stability and operational safety of the device under heavy-load operating conditions.

[0045] In some preferred embodiments, an anti-tipping wheel 61 is provided at one end of the anti-tipping support 6 near the fixed beam 1. The anti-tipping wheel 61 contacts the lower end of the fixed beam 1 and travels along the lower end of the fixed beam 1.

[0046] Optionally, while the anti-tipping support 6 provides support, anti-tipping wheels 61 are provided to reduce friction during the movement of the anti-tipping support 6 relative to the fixed beam 1.

[0047] In some preferred embodiments, an electric hoist 7 is installed at the lower end of the telescopic beam 2, and a hoist moving pulley 71 is provided between the telescopic beam 2 and the electric hoist 7 to drive the electric hoist 7 to move horizontally along the installation direction of the telescopic beam 2; a hook 8 is installed at the lower end of the electric hoist 7, and the electric hoist 7 drives the hook 8 to move up and down.

[0048] Optionally, the telescopic lifting equipment is used in hoisting operations to meet the needs of maintenance and hoisting of large components and heavy materials inside the vertical shaft furnace. An electric hoist 7 is installed at the lower end of the telescopic beam 2, and a hoist moving pulley 71 is set between the telescopic beam 2 and the electric hoist 7. The hoist moving pulley 71 can move horizontally back and forth along the extension direction of the telescopic beam 2, thereby stably driving the electric hoist 7 to move synchronously with the pulley, realizing flexible adjustment of the working position of the electric hoist 7, and adapting to the hoisting and dismantling operation needs of different positions inside the furnace. The bottom end of the electric hoist 7 is equipped with a hoisting hook 8. The lifting drive mechanism of the electric hoist 7 can drive the hook 8 to make vertical lifting and lowering movements, thereby completing the hoisting, lifting, lowering and positioning of heavy objects, realizing the mechanized hoisting and transfer of heavy objects such as internal parts, maintenance equipment and accumulated material cleaning tools of the vertical shaft furnace, replacing traditional manual handling operations and significantly reducing the intensity of manual labor.

[0049] Optionally, the electric hoist 7 adopts a low headroom hoist, which has a smaller overall structural height and lower space occupancy, effectively saving vertical working space below the telescopic beam 2. Under the condition of fixed diameter of the vertical furnace maintenance door and limited vertical space inside the furnace, the low headroom hoist can avoid the problem of material passage restriction caused by the excessive height of conventional hoists, ensuring that large-sized and bulky maintenance materials and equipment components can be smoothly lifted by the hook 8 and smoothly pass through the vertical furnace maintenance door to complete the hoisting operation in and out of the furnace body, greatly improving the adaptability and versatility of the device for hoisting large materials.

[0050] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A telescopic lifting device, characterized in that, include: Fixed beam (1) is fixedly installed on the factory building beam outside the vertical furnace maintenance door, and is set in the direction of the factory building beam pointing towards the vertical furnace; The telescopic beam (2) is movably connected to the fixed beam (1). The telescopic beam (2) and the fixed beam (1) are installed in the same direction. The telescopic beam (2) can be close to or away from the vertical furnace. The sum of the length of the telescopic beam (2) and the length of the fixed beam (1) is greater than the distance between the plant beam and the vertical furnace.

2. The telescopic lifting device according to claim 1, characterized in that, A walking component (3) is provided between the fixed beam (1) and the telescopic beam (2). The walking component (3) is fixedly connected to the telescopic beam (2), and the walking component (3) is movably connected to the fixed beam (1). The walking component (3) drives the telescopic beam (2) to move parallel to the installation direction of the fixed beam (1).

3. The telescopic lifting device according to claim 2, characterized in that, The walking component (3) includes: The connecting rod (31) is fixedly installed on the telescopic beam (2); The traveling wheel (32) is installed on the connecting rod (31) and overlaps the fixed beam (1). The fixed beam (1) is an I-beam structure, and the traveling wheel (32) is placed between the two crossbeams of the I-beam.

4. The telescopic lifting device according to claim 3, characterized in that, The walking assembly (3) includes two sets, each set of the walking assembly (3) includes the connecting rod (31) and the walking wheel (32). At least one of the walking components (3) is connected to a drive device, which drives the walking component (3) to move along the extension direction of the fixed beam (1).

5. A telescopic lifting device according to claim 4, characterized in that, The driving device is a drive motor (4), the walking wheel (32) is a pulley, the housing of the drive motor (4) is fixedly installed on the connecting rod (31), and the output shaft of the drive motor (4) is connected to the walking wheel (32).

6. A telescopic lifting device according to claim 4, characterized in that, The driving device is a rotary motor and a chain (51). The chain (51) is laid on the lower crossbeam of the I-beam of the fixed beam (1). The traveling wheel (32) is a small gear (52). A large gear is installed on the output shaft of the rotary motor. The chain (51) is stretched around the large gear. The small gear (52) meshes with the chain (51).

7. A telescopic lifting device according to claim 3, characterized in that, The height of the middle position of the I-beam of the fixed beam (1) is greater than the diameter of the traveling wheel (32).

8. A telescopic lifting device according to claim 1, characterized in that, An anti-tipping support (6) is provided on the side of the telescopic beam (2) near the factory beam. The anti-tipping support (6) is installed between the telescopic beam (2) and the fixed beam (1). The first height of the anti-tipping support (6) is the same as the second height between the telescopic beam (2) and the fixed beam (1).

9. A telescopic lifting device according to claim 8, characterized in that, The anti-tipping support (6) is provided with an anti-tipping wheel (61) at one end near the fixed beam (1). The anti-tipping wheel (61) contacts the lower end of the fixed beam (1) and travels along the lower end of the fixed beam (1).

10. A telescopic lifting device according to claim 1, characterized in that, An electric hoist (7) is installed at the lower end of the telescopic beam (2), and a hoist moving pulley (71) is provided between the telescopic beam (2) and the electric hoist (7) to drive the electric hoist (7) to move horizontally along the installation direction of the telescopic beam (2); The electric hoist (7) is equipped with a hook (8) at its lower end, and the electric hoist (7) drives the hook (8) to move up and down.

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