A mast body gap sealing structure for a lifting mast

Abstract

This utility model discloses a sealing structure for the gap between the mast bodies of a lifting mast. This sealing structure is used to seal the gap between a first and second mast body that are relatively telescopic. It includes a sealing element and a fixed cover. The sealing element is fitted around the outer periphery of the first mast body and includes a base and a sealing lip extending obliquely from the base towards the first mast body. The sealing lip abuts against the outer periphery of the first mast body to form a seal. The fixed cover is fitted over the base of the sealing element and is fixedly connected to the second mast body or a mounting reference fixed to the second mast body, pressing and positioning the sealing element. This utility model achieves continuous sealing during the mast body lifting process through the elastic contact of the sealing lip, effectively preventing dust and sand from entering the mast interior through the gap between the mast bodies. The sealing element and the fixed cover are installed separately, making installation and replacement convenient and quick.

Description

Technical Field

[0001] This utility model relates to the field of mast technology, specifically to a structure for sealing the gap between relatively telescopic poles in a lifting mast for dust and sand prevention. Background Technology

[0002] A lifting mast is a device that uses multiple nested sections of tubing of varying sizes to raise or lower a carrier, powered by compressed air or electricity. It is widely used in industries such as fire protection, security, meteorology, communications, and the military. A lifting mast consists of multiple nested sections, with gaps between adjacent sections to allow for smooth raising and lowering of the inner section relative to the outer section.

[0003] In practical use, lifting masts are often deployed in outdoor environments, facing harsh conditions such as wind, sand, and dust. When the inner mast extends from the outer mast, fine particles such as dust and sand can easily enter the mast through the gap between the two masts. These particles, once inside the mast gap, will accelerate wear on the mast surface, affecting the smoothness of lifting; in severe cases, they may even cause the mast to jam, or even damage internal seals and transmission components, reducing the service life and operational reliability of the lifting mast.

[0004] In existing technologies, lifting masts typically incorporate sealing rings or dustproof rings between the connecting sleeve and the mast body to prevent external debris from entering. However, during long-term use, the sealing ring surface is continuously worn down due to the repeated lifting and lowering motion of the mast body, gradually reducing its sealing performance. Some dustproof rings achieve sealing solely through simple contact with the mast body, lacking adaptive compensation capabilities. When there are minor irregularities on the mast body surface or tolerances in the mast body diameter, the sealing effect is poor. Furthermore, existing sealing structures often employ an integral design, making installation and replacement inconvenient, especially in situations where space is limited at the mast end, leading to difficult maintenance operations.

[0005] Therefore, there is an urgent need for a pole gap sealing structure that has durable sealing performance, can adaptively compensate for pole movement, and is easy to install and maintain, so as to effectively prevent dust and sand from entering the interior of the lifting mast through the pole gap. Utility Model Content

[0006] The purpose of this utility model is to provide a sealing structure for the gap between the mast body of a lifting mast, so as to solve the technical problems of unsustainable sealing performance, lack of self-adaptive compensation capability, and inconvenient installation and maintenance in the prior art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A mast body gap sealing structure for sealing the gap between a retractable first mast body and a second mast body, characterized in that it comprises: A sealing element is fitted onto the outer periphery of the first rod body. The sealing element includes a base and a sealing lip that extends obliquely from the base toward the first rod body. The sealing lip abuts against the outer periphery of the first rod body to form a seal. A fixed cover is placed over the base of the seal and is fixedly connected to the second rod or a mounting reference fixed to the second rod to press and position the seal.

[0008] By adopting the above technical solution, a sealing element is fitted onto the outer periphery of the first mast body. The sealing lip of the sealing element extends obliquely from its base towards the first mast body and abuts against the outer periphery of the first mast body, forming an axial contact seal. When dust and sand intrude into the gap between the mast bodies from the outside, the sealing lip acts as the first line of defense, directly blocking the dust and sand from entering. A fixed cover is placed on the base of the sealing element, pressing and positioning the sealing element to prevent it from loosening or shifting during the mast's raising and lowering process. The oblique design of the sealing lip allows it to fit more tightly against the mast surface under external pressure or wind and sand impact, enhancing the sealing effect. This structure effectively prevents dust and sand from intruding into the interior of the lifting mast from the gap between the first and second mast bodies, protecting the internal transmission components of the mast from particulate wear.

[0009] Preferably, the base of the seal is located on the second rod or on the mounting reference, and the sealing lip extends obliquely from the base toward the first rod and upward.

[0010] By adopting the above technical solution, the base of the seal is located on the second rod or the mounting reference, providing a stable mounting foundation for the seal. The sealing lip extends inclinedly from the base towards the first rod and upwards. This inclination direction allows external dust and sand to slide off naturally under gravity, preventing accumulation on the sealing lip surface. Simultaneously, the upward inclination causes the sealing lip to be pulled upwards by the frictional force of the first rod, further gripping the rod surface and enhancing the dynamic sealing effect. A line contact seal is formed between the sealing lip and the rod surface, resulting in concentrated contact pressure, good sealing effect, and low friction, preventing excessive resistance to the rod's vertical movement.

[0011] Preferably, the base of the seal is located on the end face of the second rod or on the upper end face of the mounting reference member.

[0012] By adopting the above technical solution, the base of the seal is located on the end face of the port from which the first rod extends from the second rod, or on the upper end face of the mounting reference component. Using the end face of the rod port or the upper end face of the mounting reference component as the installation reference ensures accurate positioning and convenient installation. The base and end face are in surface contact, resulting in a large contact area and uniform force distribution. This prevents the seal from tilting or shifting during operation, ensuring the sealing lip remains in the correct sealing position. The end face mounting method has a simple structure, eliminating the need for additional mounting grooves or positioning structures on the rod surface, thus reducing the processing requirements for the rod.

[0013] Preferably, the fixed cover is provided with an annular groove, the base of the seal is accommodated in the annular groove, and the annular groove covers the top surface and outer peripheral surface of the base.

[0014] By adopting the above technical solution, the fixed cover is provided with an annular groove, and the base of the seal is accommodated in the annular groove. The top wall of the annular groove covers the top surface of the base, and the side wall of the annular groove covers the outer peripheral surface of the base, forming a comprehensive coverage of the base. The annular groove covers the top surface of the base to prevent dust and sand from falling into the gap between the base and the fixed cover from above; it also covers the outer peripheral surface of the base to prevent dust and sand from intruding from the side. The restraining effect of the annular groove also enhances the structural stability of the base, preventing deformation or dislocation of the base due to material aging or external forces during long-term use, thus ensuring the long-term reliability of the seal.

[0015] Preferably, the seal is an elastic seal, and the sealing lip elastically abuts against the outer periphery of the first rod to form a seal.

[0016] By adopting the above technical solution, the sealing element is made of elastic material, and the sealing lip makes elastic contact with the outer periphery of the first rod. Compared with rigid contact, elastic contact has the following advantages: First, the sealing lip can automatically generate elastic deformation according to the slight unevenness and diameter tolerance of the rod surface, always closely fitting the rod surface, resulting in a good sealing effect; second, during the lifting and lowering of the rod, the elastic sealing lip can generate corresponding elastic deformation with the movement of the rod, continuously maintaining a sealed state and preventing gaps from being generated due to the movement of the rod; third, the elastic material has a vibration damping and buffering effect, which can absorb the vibration generated during the lifting and lowering of the rod, reduce the wear rate of the sealing lip, and extend the service life of the sealing element.

[0017] Preferably, the outer periphery of the first rod is provided with a guide protrusion along the axial direction, and the sealing lip of the seal is provided with a clearance notch corresponding to the position of the guide protrusion, through which the guide protrusion passes.

[0018] By adopting the above technical solution, the guide protrusions axially arranged on the outer periphery of the first rod are used to cooperate with the guide grooves of other components during the lifting and lowering of the rod, thereby achieving the anti-rotation guiding function. A clearance notch is provided on the sealing lip of the seal corresponding to the position of the guide protrusion, allowing the guide protrusion to pass smoothly through the sealing lip without affecting its original guiding function. The shape of the clearance notch matches the cross-sectional shape of the guide protrusion, and the two side walls of the clearance notch are in close contact or with a small gap with the two side surfaces of the guide protrusion. This ensures the free passage of the guide protrusion while also constraining it circumferentially, further enhancing the circumferential positioning between the seal and the first rod, and preventing the seal from circumferentially deflecting as the rod moves.

[0019] Preferably, the seal has a break, which extends through the base and the sealing lip along the axial direction of the seal, and the fixed cover has an opening at the position corresponding to the break, which communicates with the break.

[0020] By adopting the above technical solution, a fracture is provided on the seal, which extends axially through the base and sealing lip, causing the seal to break circumferentially and form an open annular structure. An opening is provided on the fixed cover at the corresponding position of the fracture, and the opening communicates with the fracture. The fracture and opening allow the seal and fixed cover to be installed separately around the outside of the rod, eliminating the need to slide them onto the rod end. This facilitates quick and easy installation and replacement, especially suitable for situations where other components are already installed at the rod end and cannot be slideped on from there. The fracture also allows the seal's inner diameter to be adjusted during installation by opening the fracture, accommodating rods of different diameters and providing good installation flexibility.

[0021] Preferably, the base of the fixed cover and the seal is provided with mounting holes, and the end face of the second rod or the upper end face of the mounting reference is provided with corresponding connecting holes. The fixed cover and the seal are fixed to the second rod or the mounting reference by fasteners passing through the mounting holes and connecting holes.

[0022] By adopting the above technical solution, mounting holes are provided on the base of both the fixed cover and the seal, and corresponding connecting holes are provided on the end face of the second rod or the upper end face of the mounting reference. Fasteners are passed through the mounting holes and connecting holes to fix the fixed cover and seal to the second rod or mounting reference. The fastener connection method provides a firm and reliable fixation with good vibration resistance, preventing loosening due to vibrations caused by the rod's movement. The location and number of mounting holes can be flexibly adjusted according to actual needs to adapt to different installation spaces and fixing requirements. The use of detachable fasteners facilitates disassembly and replacement of the seal after wear or aging, making maintenance convenient and reducing repair costs.

[0023] Preferably, the seal is an annular sleeve, and the sealing lip of the seal is integrally formed with the base. The sealing lip has a pre-deformation that is inclined toward the direction of the first rod in the free state.

[0024] By adopting the above technical solution, the sealing element is a ring-shaped sleeve structure, with the sealing lip and base integrally formed without connecting gaps, resulting in good structural integrity. There are no leakage channels between the sealing lip and base caused by separate connections. The integrally formed structure reduces the number of parts, lowering manufacturing and assembly costs. In its free state, the sealing lip has a pre-deformation inclined towards the first rod. After installation, the sealing lip is pushed outward by the rod, generating elastic deformation. The elastic restoring force tightly adheres to the rod surface, maintaining a continuous seal. The pre-deformation tilt angle and elastic force can be optimized and adjusted through material and structural design to adapt to sealing requirements under different operating conditions.

[0025] Preferably, the mounting reference component is a locking component that is sleeved on the outer periphery of the first rod body and fixed on the second rod body. The locking component can hold the first rod body tightly to achieve axial locking of the first rod body, and the sealing component is located above the locking component.

[0026] By adopting the above technical solution, the installation reference component is a locking component sleeved on the outer periphery of the first rod and fixed to the second rod. The locking component can hold the first rod to achieve axial locking of the first rod. The sealing component is located above the locking component, and the two are arranged sequentially along the axial direction of the first rod. After the locking component axially locks the first rod, the sealing component seals the gap between the rods to prevent dust and sand. The locking and sealing functions are independent yet coordinated: the locking component ensures that the rod does not slip axially during use, and the sealing component ensures that external dust and sand do not enter the gap between the rods. Together, they ensure the reliability and environmental adaptability of the lifting mast in the locked state. The sealing component is located above the locking component, at the forefront of the external dust and sand intrusion path, which can most effectively block dust and sand from entering the locking component and the interior of the rod, while protecting the locking component from dust and sand corrosion and extending the service life of the locking component.

[0027] Compared with the prior art, the present invention has, but is not limited to, the following main beneficial effects: 1. By extending the sealing lip in an inclined direction towards the first pole body and elastically abutting against the outer periphery of the first pole body, the sealing lip can rely on its own elastic restoring force to stick tightly to the surface of the pole body, and maintain a continuous seal during the raising and lowering of the first pole body, effectively preventing dust and sand from entering the mast from the gaps between the pole bodies.

[0028] 2. The sealing lip has a pre-deformation that tilts towards the first rod body in the free state. After installation, it can achieve continuous sealing by its own elastic force without relying on external continuous clamping force, and the sealing effect is durable and reliable. It can also adaptively compensate for the slight unevenness and diameter tolerance of the rod body surface.

[0029] 3. The fixed cover is placed on the base of the seal and covers the top and outer peripheral surfaces of the base, providing all-round protection for the base and preventing it from deforming or dislodging due to external impact during long-term use; at the same time, the fixed cover and the seal are fixed together to the second rod or the mounting reference piece by fasteners, which makes the installation firm and the disassembly and maintenance convenient. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of a specific embodiment of the present utility model; Figure 2 This is a cross-sectional view of a specific embodiment of the present utility model; Figure 3 This is a schematic diagram illustrating the connection structure between the sealing element and the fixed cover in a specific embodiment of this utility model; Figure 4 This is a schematic diagram illustrating the structure of the sealing element in a specific embodiment of this utility model; Figure 5 This is a schematic diagram illustrating the structure of the fixed cover in a specific embodiment of this utility model; Figure 6 This is a schematic diagram illustrating the structure of the mounting reference component in a specific embodiment of this utility model.

[0031] In the diagram: 100, first rod; 101, guide ridge; 200, second rod; 300, seal; 301, base; 302, sealing lip; 303, clearance notch; 304, break; 400, fixing cover; 401, annular groove; 402, opening; 403, mounting hole; 500, mounting reference piece; 501, connecting hole; 600, fastener. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for explaining this utility model and are not intended to limit this utility model.

[0033] The following is combined with Figures 1 to 6 The technical solution of this utility model will be described in further detail below.

[0034] This embodiment provides a mast body gap sealing structure for a lifting mast. This sealing structure is used to seal the gap between the relatively telescopic first mast body 100 and the second mast body 200 to prevent external dust and sand from entering the interior of the lifting mast through the mast body gap.

[0035] Please refer to the rod gap sealing structure of this embodiment, which mainly includes two parts: a sealing element 300 and a fixed cover 400. This embodiment is described in the case where the sealing structure is used in conjunction with the mounting reference element 500 (i.e., the locking element), that is, the sealing element 300 is located above the locking element and is fixedly connected to the locking element by fasteners 600.

[0036] rod structure In this embodiment, the first rod 100 is the top support rod located in the innermost circle of the lifting mast, and the second rod 200 is the second-to-top support rod adjacent to the top support rod. The first rod 100 can extend or retract axially relative to the second rod 200. The outer periphery of the first rod 100 is provided with a guide protrusion 101 along the axial direction. The guide protrusion 101 is used to cooperate with the guide groove of other components and plays a role in preventing rotation and guiding during the lifting and lowering of the first rod 100.

[0037] Mounting reference component 500 Mounting reference component 500 is a locking component, sleeved on the outer periphery of the first rod 100 and fixed to the second rod 200. The locking component can grip the first rod 100, achieving axial locking of the first rod 100. The locking component has an upper end face, on which a connecting hole 501 is provided. The connecting hole 501 is a threaded hole for engaging with the fastener 600.

[0038] Seal 300 The seal 300 is sleeved on the outer periphery of the first rod 100, located above the locking member. The seal 300 is an annular sleeve structure and is made of an elastic material (such as rubber or polyurethane). The seal 300 includes a base 301 and a sealing lip 302, which are integrally formed.

[0039] The base 301 of the sealing element 300 is located on the upper end surface of the locking element. The bottom surface of the base 301 is flat and forms a surface contact fit with the upper end surface of the locking element. The base 301 is provided with a mounting hole 403 opened in the vertical direction, and the position of the mounting hole 403 corresponds to the connecting hole 501 on the locking element.

[0040] The sealing lip 302 extends obliquely from the base 301 towards the first rod 100 and upwards. The end of the sealing lip 302 elastically abuts against the outer periphery of the first rod 100 to form a seal. In its free state, the sealing lip 302 has a pre-deformation that is oblique towards the first rod 100; that is, the natural inner diameter of the sealing lip 302 when not installed is slightly smaller than the outer diameter of the first rod 100. After installation, the sealing lip 302 is pushed outwards by the first rod 100, resulting in elastic deformation. Relying on its elastic restoring force, it adheres tightly to the outer periphery of the first rod 100, achieving a continuous seal.

[0041] The outer periphery of the first rod 100 is provided with a guide protrusion 101 along the axial direction. The sealing lip 302 of the sealing member 300 is provided with a relief notch 303 corresponding to the position of the guide protrusion 101. The guide protrusion 101 passes through the relief notch 303, so that the sealing lip 302 can still maintain an effective seal with the outer periphery of the first rod 100 at the position of the guide protrusion 101.

[0042] The seal 300 has a break 304 that extends axially through the base 301 and the sealing lip 302. The break 304 creates an annular structure with an opening 402 in the seal 300, which facilitates separate installation on the outer periphery of the rod without needing to be fitted from the end of the rod.

[0043] Fixed cover 400 A retaining cover 400 is placed over the base 301 of the sealing element 300. The retaining cover 400 is made of rigid materials such as metal or plastic and is used to press and position the sealing element 300 onto the locking element.

[0044] The fixed cover 400 is provided with an annular groove 401, which is a rectangular cross-section annular groove opened circumferentially along the lower end of the fixed cover 400. The base 301 of the sealing element 300 is accommodated in the annular groove 401, which covers the top surface and outer peripheral surface of the base 301, providing all-round coverage and protection for the base 301. The top wall of the annular groove 401 covers the top surface of the base 301, preventing dust and sand from falling into the gap between the base 301 and the fixed cover 400 from above; the side wall of the annular groove 401 covers the outer peripheral surface of the base 301, preventing dust and sand from entering from the side. The restraining effect of the annular groove 401 also enhances the structural stability of the base 301, preventing the base 301 from deforming or dislodging due to material aging or external forces during long-term use.

[0045] An opening 402 is provided on the fixed cover 400 at the position corresponding to the break 304 of the seal 300, and the opening 402 communicates with the break 304. The cooperation between the opening 402 and the break 304 allows the fixed cover 400 and the seal 300 to be easily installed separately on the outer periphery of the rod during installation.

[0046] The fixed cover 400 is provided with a mounting hole 403, which is opened in the vertical direction and is positioned to correspond to the mounting hole 403 on the base 301 of the seal 300 and the connecting hole 501 on the locking member.

[0047] Fixed connection method Both the fixed cover 400 and the base 301 of the seal 300 are provided with mounting holes 403, and the upper end face of the locking member is provided with a corresponding connecting hole 501. During installation, fasteners 600 (such as screws) are passed sequentially through the mounting holes 403 on the fixed cover 400 and the base 301 of the seal 300, and then screwed into the connecting hole 501 on the locking member, thus fixing the fixed cover 400 and the seal 300 together onto the locking member. The fastener 600 connection method provides a firm and reliable fixation, good vibration resistance, and will not loosen due to vibrations caused by the lifting and lowering of the rod. The use of detachable fasteners 600 facilitates disassembly and replacement of the seal 300 after wear or aging, making maintenance convenient and reducing repair costs.

[0048] Sealing principle After the sealing structure is installed, the sealing element 300 is located above the locking element, and the two are arranged sequentially along the axial direction of the first rod 100. After the locking element axially locks the first rod 100, the sealing element 300 seals the gap between the rods to prevent dust and sand.

[0049] During the extension and retraction of the first rod 100 relative to the second rod 200, the sealing lip 302 of the seal 300 remains in elastic contact with the outer periphery of the first rod 100. In its free state, the sealing lip 302 has a pre-deformation that tilts towards the first rod 100; after installation, it adheres tightly to the rod surface due to its own elastic restoring force. When the first rod 100 rises or falls, the sealing lip 302 undergoes corresponding elastic deformation with the movement of the rod, maintaining a tight fit with the rod and achieving a continuous sealing effect. The elastic contact of the sealing lip 302 can also adaptively compensate for minor irregularities and diameter tolerances on the rod surface, ensuring a durable and reliable sealing effect.

[0050] When external dust and sand infiltrate the gaps between the rods, the sealing lip 302 acts as the front line of defense, directly blocking the entry of dust and sand. The sealing lip 302 extends obliquely from the base 301 towards the first rod 100 and upwards, allowing external dust and sand to slide off naturally under gravity, preventing accumulation on the surface of the sealing lip 302. The fixed cover 400 covers the top surface and outer peripheral surface of the base 301, further preventing dust and sand from infiltrating from above or to the side of the base 301.

[0051] Cooperation with locking components The seal 300 is located above the locking element. The locking and sealing functions are independent yet work together: the locking element ensures that the first rod 100 does not slip axially during use, and the seal 300 ensures that external dust and sand do not enter the gap between the rods. Together, they ensure the reliability and environmental adaptability of the lifting mast in the locked state.

[0052] The seal 300 is located above the locking element, at the very front of the external dust and sand intrusion path, effectively preventing dust and sand from entering the locking element and the inside of the rod. At the same time, the elastic contact of the sealing lip 302 exerts minimal friction on the first rod 100, thus not affecting the locking effect of the locking element or the normal lifting and lowering movement of the first rod 100.

[0053] Installation process During installation, firstly, the locking member is fitted onto the outer periphery of the first rod 100 and fixed onto the second rod 200. Then, the sealing member 300 is opened through the break 304 and fitted onto the outer periphery of the first rod 100, so that the base 301 of the sealing member 300 is placed on the upper end face of the locking member, and the guide ridge 101 passes through the clearance notch 303 on the sealing lip 302. Next, the fixing cover 400 is placed over the base 301 of the sealing member 300, so that the base 301 of the sealing member 300 is accommodated in the annular groove 401 of the fixing cover 400, and the opening 402 on the fixing cover 400 is aligned with the break 304 of the sealing member 300. Finally, the fastener 600 is passed sequentially through the mounting holes 403 on the fixing cover 400 and the mounting holes 403 on the base 301 of the sealing member, screwed into the connecting hole 501 on the locking member, and tightened to complete the installation of the sealing structure.

[0054] It should be understood that the above embodiments are merely illustrative examples and are not intended to limit the scope of this utility model. Based on the above embodiments, those skilled in the art can make appropriate adjustments and modifications to the material and hardness of the sealing element 300, the inclination angle and length of the sealing lip 302, the structural form of the fixing cover 400, the type and quantity of the fasteners 600, and the specific form of the mounting reference element 500 (either a locking element or direct mounting on the end face of the second rod 200 port), according to actual application requirements. Any modifications, equivalent substitutions, and improvements made within the spirit and scope of the claims of this utility model should be included within the protection scope of this utility model.

Claims

1. A mast gap sealing structure of a lifting mast for sealing a gap between a first mast (100) and a second mast (200) which are relatively extendable, characterized by, include: A sealing element (300) is sleeved on the outer periphery of the first rod (100). The sealing element (300) includes a base (301) and a sealing lip (302) extending obliquely from the base (301) toward the first rod (100). The sealing lip (302) abuts against the outer periphery of the first rod (100) to form a seal. A fixed cover (400) is placed on the base (301) of the seal (300). The fixed cover (400) is fixedly connected to the second rod (200) or the mounting reference (500) fixed on the second rod (200) to press and position the seal (300).

2. A mastway gap sealing structure of a lifting mast according to claim 1, characterized in that The base (301) of the seal (300) is provided on the second rod (200) or on the mounting reference (500), and the sealing lip (302) extends obliquely from the base (301) toward the first rod (100) and upward.

3. A mastway gap sealing structure of a lifting mast according to claim 2, characterized in that The base (301) of the seal (300) is located on the end face of the port of the second rod (200) or on the upper end face of the mounting reference (500).

4. A mastway gap sealing structure of a lifting mast according to claim 3, characterized in that The fixed cover (400) is provided with an annular groove (401), and the base (301) of the seal (300) is accommodated in the annular groove (401), which covers the top surface and outer peripheral surface of the base (301).

5. A mastway gap sealing structure of a lifting mast according to claim 1 or 2 or 3, characterized in that The seal (300) is an elastic seal (300), and the sealing lip (302) elastically abuts against the outer periphery of the first rod (100) to form a seal.

6. The mastway pole intermast gap seal structure of claim 1, wherein, The outer periphery of the first rod (100) is provided with a guide protrusion (101) along the axial direction. The sealing lip (302) of the seal (300) is provided with a relief notch (303) corresponding to the position of the guide protrusion (101). The guide protrusion (101) passes through the relief notch (303).

7. A mastway gap sealing structure of a lifting mast according to claim 6, characterized in that The seal (300) has a break (304) that penetrates the base (301) and the sealing lip (302) along the axial direction of the seal (300). The fixed cover (400) has an opening (402) at the position corresponding to the break (304) and the opening (402) communicates with the break (304).

8. The mastway pole intermast gap seal structure of claim 1, wherein, The base (301) of the fixed cover (400) and the seal (300) are provided with mounting holes (403), and the end face of the second rod (200) or the upper end face of the mounting reference (500) are provided with corresponding connecting holes (501). The fixed cover (400) and the seal (300) are fixed to the second rod (200) or the mounting reference (500) by fasteners (600) passing through the mounting holes (403) and connecting holes (501).

9. The mastway pole intermast gap seal structure of claim 1, wherein, The seal (300) is an annular sleeve. The sealing lip (302) of the seal (300) is integrally formed with the base (301). The sealing lip (302) has a pre-deformation that is inclined toward the first rod (100) in the free state.

10. The mastway pole intermast gap seal structure of claim 1, wherein, The mounting reference piece (500) is a locking piece that is sleeved on the outer periphery of the first rod (100) and fixed on the second rod (200). The locking piece can hold the first rod (100) to achieve axial locking of the first rod (100). The sealing piece (300) is located above the locking piece.

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