A sealing structure of a lifting mast

Abstract

The utility model discloses a kind of sealing structure of lifting mast, belong to mast technical field.The sealing structure is located at the outer periphery of stem body, including sequentially arranged in axial direction supporting member, sealing element and positioning member;Supporting member is spliced by multiple ring segment body, adjacent ring segment body is mutually spliced to form complete ring body by interlocking structure, the inner periphery of supporting member and the outer periphery of stem body positioning cooperation;Positioning member is split mounted on stem body;Sealing element is clamped between supporting member and positioning member.The utility model is spliced by the cooperation of supporting member and detachable splicing positioning member, realizes the split mounting of sealing structure in the outer periphery of stem body, need not from stem body end portion sleeve, installation and replacement are convenient and fast;Supporting member is embedded in the annular recess of stem body to realize axial limit, positioning is reliable, sealing element is stably clamped between supporting member and positioning member, and sealing performance is durable.

Description

Technical Field

[0001] This utility model relates to the field of mast technology, specifically to a sealing structure for the mast body, particularly the end of the top support, of a lifting mast. 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, electricity, or human labor. It is widely used in industries such as fire protection, security, meteorology, communications, and the military. The lifting mast consists of multiple nested sections. During operation, a sealing structure is required between adjacent sections to prevent rainwater, dust, and other debris from seeping into the mast and affecting its normal operation.

[0003] In existing technologies, the sealing structure of a lifting mast typically employs a sealing ring embedded between the piston and the mast body. For example, some existing solutions have an annular groove on the inner wall of the piston, into which the sealing ring is embedded, achieving a seal through contact between the sealing ring and the outer wall of the mast body. However, during long-term use, due to the repeated lifting and lowering movements of the mast body, the surface of the sealing ring is continuously worn, and the sealing performance gradually decreases. Especially in extreme weather conditions or when operating in cold regions, rainwater that seeps in may freeze within the gaps between the mast bodies, causing the inner and outer mast bodies to separate and deform, or the frozen ice may connect the inner and outer mast bodies together, preventing the lifting mast from raising and lowering normally.

[0004] Furthermore, the innermost top support of the lifting mast has the smallest radial dimension, requiring the internal cabling for cables. If the sealing structure were located on the secondary top support, the top support's dimensions would decrease while maintaining the overall mast's outer diameter, resulting in insufficient internal space for the cables. Therefore, the sealing structure needs to be directly installed on the top support. However, due to the limited space on the top support, existing integral sealing rings are difficult to install, and the sealing components lack reliable positioning and ease of replacement during use.

[0005] Therefore, there is an urgent need for a sealing structure that is easy to install and replace, has reliable sealing element positioning, and is especially suitable for the end of the top support of the lifting mast. Utility Model Content

[0006] The purpose of this utility model is to provide a sealing structure for a lifting mast, so as to solve the technical problems of inconvenient installation and replacement of sealing components and insufficient positioning reliability in the prior art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A sealing structure for a lifting mast, the sealing structure being disposed on the outer periphery of the mast body, comprising a support member, a sealing member, and a positioning member arranged sequentially along the axial direction; The support component is composed of multiple ring segments spliced ​​together. Adjacent ring segments are spliced ​​together to form a ring through an interlocking structure on their respective splicing surfaces. The inner circumference of the support component is positioned and matched with the outer circumference of the rod. The positioning components are separately installed on the rod body; The seal is sandwiched between the support and the positioning element.

[0008] By adopting the above technical solution, the sealing structure consists of three layers stacked axially: a support, a seal, and a positioning element. Both the support and positioning elements are modular and detachable, allowing for direct, separate installation on the outer circumference of the rod without needing to be fitted from the rod end. This facilitates quick and easy installation, making it particularly suitable for situations where space is limited at the rod end. The support is formed by multiple interlocking ring segments, ensuring a stable connection. Its inner circumference positions and engages with the outer circumference of the rod, providing reliable axial support for the seal. The positioning element is also modularly installed on the rod, providing axial restraint for the seal. The seal is sandwiched between the support and positioning elements, reliably positioned and constrained, preventing loosening or displacement over long-term use. Since all components are modular, the rod does not need to be removed when replacing the seal, simplifying maintenance.

[0009] Preferably, after the sealing structure is installed, the support, the seal and the positioning element are stacked sequentially along the axial direction of the rod. The support provides support for the seal, the positioning element abuts or presses against the seal, and the seal is positioned between the support and the positioning element or is axially compressed between the support and the positioning element.

[0010] By adopting the above technical solution, after the sealing structure is installed, the support, seal, and positioning components are stacked sequentially along the axial direction of the rod. The support supports the seal, and the positioning components abut or press against the seal, reliably positioning the seal between the support and the positioning components. When the positioning components apply axial pressure to the seal, the seal is axially compressed between the support and the positioning components. Under the action of the axial compressive force, the seal undergoes radial expansion deformation, causing its inner circumferential surface to fit more tightly against the outer circumference of the rod, and its outer circumferential surface to fit more tightly against the inner wall of the outer component, thus forming a reliable axial sealing effect. The clamping force of the seal can be adjusted by the installation position of the positioning components, making the sealing effect controllable.

[0011] Preferably, the outer periphery of the rod is provided with an annular recess, and the support member is embedded in the annular recess. The two end faces of the support member along the axial direction, which correspond to the two opposite side walls of the annular recess, respectively abut against the two side walls of the annular recess, thereby achieving axial positioning of the support member.

[0012] By adopting the above technical solution, an annular recess is provided on the outer periphery of the rod, and the support component is embedded in the annular recess. The two end faces of the support component along the axial direction abut against the two opposite sidewalls of the annular recess, respectively. The two sidewalls of the annular recess form a bidirectional axial limit on the support component, preventing the support component from moving axially or falling out during the lifting and lowering of the rod. The support component achieves reliable positioning with the rod through the annular recess, ensuring accurate installation and providing a stable support foundation for the seal. This guarantees that the seal remains in the correct position during the lifting and lowering of the rod, resulting in stable and durable sealing performance.

[0013] Preferably, each ring segment of the support member includes a mating segment, an interlocking segment, and an extension segment arranged sequentially along the axial direction, and the interlocking segment is provided with the interlocking structure; the mating segment and the interlocking segment are embedded in the annular recess, the end face of the mating segment abuts against one side wall of the annular recess, and the end face of the interlocking segment abuts against the other side wall of the annular recess.

[0014] By adopting the above technical solution, each ring segment of the support component is sequentially divided into an interlocking segment, an interlocking segment, and an extension segment along the axial direction, with each segment having a clearly defined function. The interlocking segment and the interlocking segment are embedded in the annular recess. The end face of the interlocking segment abuts against one side wall of the annular recess, and the end face of the interlocking segment abuts against the other side wall of the annular recess. Both end faces form surface contact limiting with the two side walls of the recess, ensuring reliable axial limiting and balanced force distribution. The interlocking structure is located on the interlocking segment, i.e., in the internal area of ​​the annular recess, and is protected by the side wall of the annular recess, making it less prone to loosening due to external impacts, resulting in high splicing reliability.

[0015] Preferably, the extension section is located outside the annular recess, the inner diameter of the extension section is larger than the inner diameter of the fitting section and the interlocking section, and the inner circumference of the extension section abuts against the outer circumference of the rod.

[0016] By adopting the above technical solution, the extension section is located outside the annular recess, that is, it extends axially beyond the range of the annular recess. The inner diameter of the extension section is larger than the inner diameter of the fitting section and the interlocking section. The inner circumference of the extension section abuts against the outer circumference of the rod body, providing a radial positioning reference for the seal, ensuring that the seal is evenly distributed around the rod body, and the sealing effect is uniform.

[0017] Preferably, the positioning component is assembled from at least one positioning unit. The positioning unit is provided with a positioning protrusion, and the rod body is provided with a corresponding positioning recess. The positioning component is fixed by inserting the positioning protrusion into the positioning recess.

[0018] By adopting the above technical solution, the cooperation between the positioning protrusion and the positioning recess provides reliable radial and axial fixation for the positioning component. During installation, positioning can be completed simply by aligning the positioning protrusion with the positioning recess and inserting it, without the need for additional tools, making the operation simple. The positioning component provides axial restraint for the seal, preventing the seal from falling off the support. The cooperation between the positioning protrusion and the positioning recess ensures that the positioning component will not loosen or fall off during the lifting and lowering of the rod, guaranteeing the long-term reliability of the seal clamping.

[0019] Preferably, the outer periphery of the rod is provided with a guide ridge along the axial direction, and the guide ridge forms an avoidance area at the installation position of the corresponding sealing structure; the support is provided with a slot, and a section of the guide ridge is adapted to be accommodated in the slot.

[0020] By adopting the above technical solution, a guide ridge is axially arranged on the outer periphery of the rod. This guide ridge cooperates with the guide groove of the outer component to achieve an anti-rotation guiding function during the rod's lifting and lowering process. The guide ridge forms a clearance area at the corresponding installation position of the sealing structure; that is, the guide ridge breaks off or avoids the sealing structure installation area, freeing up space for the sealing structure installation. The support component has a slot that matches the second guide ridge section, enabling the support component to play a positioning role during installation, preventing the support component from deflecting around the rod's axis during use, and achieving a tight fit with the outer periphery of the rod, while not affecting the original anti-rotation guiding function of the guide ridge.

[0021] Preferably, the guide ridge is broken at the avoidance area to form a first guide ridge segment and a second guide ridge segment that are axially spaced apart; the seal is located between the first guide ridge segment and the second guide ridge segment; the first guide ridge segment is located in the groove; and the positioning units of the positioning element are located on both sides of the second guide ridge segment.

[0022] By adopting the above technical solution, the sealing element is located between the first and second guide ridge segments, and its axial position is defined by the distance between the two guide ridge segments, ensuring accurate installation and positioning. The positioning units of the positioning element are located on both sides of the second guide ridge segment, meaning that the positioning units avoid the guide ridges in the circumferential direction, forming an interlaced layout with the guide ridges. This allows the positioning element to be fixed to the rod body through the positioning protrusions without interfering with the guide ridges. The entire sealing structure makes full use of the space in the broken area of ​​the guide ridges, with a compact and reasonable layout of each component, resulting in high space utilization.

[0023] Preferably, the interlocking structure of adjacent ring segments includes a cavity on the splicing surface of one ring segment and a protrusion on the splicing surface of another ring segment. The protrusion is embedded in the cavity to achieve splicing of adjacent ring segments. Both the cavity and the protrusion are located in the middle of the ring segment.

[0024] By adopting the above technical solution, both the concave cavity and the protrusion are located in the middle of the ring segment, i.e., in the central region of the ring segment. This location ensures uniform stress distribution and stable splicing. After the protrusion is embedded into the concave cavity, it forms an interlocking fit in both the radial and axial directions, preventing adjacent ring segments from separating radially or misaligning axially. The interlocking structure is located in the middle and is supported by material on both sides, resulting in high structural strength and resistance to breakage due to external forces. Splicing is simple; just align the protrusion with the concave cavity and press it in. This method is easy to operate and highly efficient.

[0025] Preferably, the sealing structure is located on the outer periphery of one end of the rod body, the rod body is the top support rod located in the innermost ring of the lifting mast, and the sealing element is a Y-shaped sealing ring.

[0026] By adopting the above technical solution, the top support rod is the smallest rod in terms of radial dimension among the lifting masts, and its interior requires cable routing. Installing the sealing structure directly on the top support rod, compared to installing it on the secondary top support rod, avoids the problem of reduced top support rod size due to the sealing structure occupying radial space, ensuring sufficient cable routing space inside the top support rod. The sealing structure is located at the end of the rod, close to the end face, facilitating installation, operation, and daily maintenance. Simultaneously, the end position is where rainwater and dust are most easily intruded; placing the sealing structure here effectively prevents external debris from entering the mast interior. Furthermore, by using a Y-shaped sealing ring, for pneumatic lifting masts, when the top support rod rises relative to the secondary top support rod, the gas at the bottom rises, causing the Y-shaped opening of the Y-shaped sealing ring to contract, reducing contact with the secondary top support rod, making the rise easier. Conversely, when the top support rod descends relative to the secondary top support rod, the Y-shaped sealing ring is subjected to the upward force of the gas at the bottom, causing the Y-shaped opening to expand, buffering the descent and preventing rapid descent that could cause damage or injury to the operator.

[0027] Compared with the prior art, the present invention has, but is not limited to, the following main beneficial effects: 1. The sealing structure consists of three layers: a support, a seal, and a positioning component. Both the support and the positioning components adopt a spliced ​​and detachable structure, which can be directly installed on the outer periphery of the pole without having to be inserted from the end of the pole. This makes installation convenient and quick, and is especially suitable for occasions where the end space is limited.

[0028] 2. The support component achieves axial positioning through the annular recess, and the positioning component is fixed by the positioning protrusion cooperating with the positioning recess. The sealing component is reliably clamped between the two, resulting in high positioning reliability and preventing loosening or displacement during long-term use.

[0029] 3. The support component is composed of multiple ring segments spliced ​​together by an interlocking structure. The splicing structure is located in the middle of the ring segments, which ensures a stable splice, good overall integrity after assembly, and easy disassembly and replacement of seals, making maintenance convenient.

[0030] 4. The seal uses a Y-type sealing ring, which makes the mast rise more easily and has a buffering effect when it descends. The seal is positioned on the mast, which effectively utilizes the internal space of the lifting mast. There is no need to set the seal on the piston slot at the bottom of the mast, and there is no need to set up a piston, which reduces production costs. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of a specific embodiment of the present utility model; Figure 2 This is a schematic diagram illustrating the structure of the rod in a specific embodiment of this utility model; Figure 3 This is a schematic diagram illustrating the structure of the support component in a specific embodiment of this utility model; Figure 4 This is a schematic diagram illustrating the structure of the annular segment body in a specific embodiment of this utility model; Figure 5 This is a schematic diagram illustrating the structure of the support component installed on the pole body according to a specific embodiment of the present utility model; Figure 6 This is a cross-sectional view of a specific embodiment of the present invention showing the support member located in the annular recess; Figure 7 This is a schematic diagram illustrating the structure of the positioning component in a specific embodiment of this utility model; Figure 8 This is a schematic diagram illustrating the structure of the positioning unit in a specific embodiment of this utility model; Figure 9 This is a schematic diagram illustrating the structure of the sealing element in a specific embodiment of this utility model.

[0032] In the diagram: 100, sealing structure; 200, rod body; 201, annular recess; 202, side wall; 203, positioning recess; 204, guide ridge; 205, first guide ridge segment; 206, second guide ridge segment; 300, support member; 301, ring segment body; 302, splicing surface; 303, interlocking structure; 304, fitting segment; 305, interlocking segment; 306, extension segment; 307, slot; 308, protrusion; 309, cavity; 400, sealing element; 401, Y-shaped opening; 500, positioning element; 501, positioning unit; 502, positioning protrusion. Detailed Implementation

[0033] 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.

[0034] The following is combined Figures 1 to 9 The technical solution of this utility model will be described in further detail below.

[0035] This embodiment provides a sealing structure for a lifting mast. The sealing structure 100 is located on the outer periphery of the mast body 200 and is used to seal the gap between two adjacent mast body sections 200 to prevent rainwater, dust and other debris from seeping into the mast from the gap between the mast body sections 200.

[0036] Please refer to the sealing structure of the lifting mast in this embodiment, which mainly includes three parts: a support 300, a sealing element 400, and a positioning element 500. The three parts are stacked sequentially along the axial direction of the mast body 200 to form a three-layer stacked sealing structure 100.

[0037] 200-meter rod structure In this embodiment, the pole 200 is the top support pole located in the innermost circle of the lifting mast. The top support pole is the pole 200 in the lifting mast that can be raised to the top and has the smallest radial diameter. The sealing structure 100 is provided on the outer periphery of one end (lower end) of the top support pole.

[0038] A guide ridge 204 is provided axially on the outer periphery of the rod 200. The guide ridge 204 is used to cooperate with the guide groove of the outer component and plays a role in preventing rotation and guiding during the lifting and lowering of the rod 200. The guide ridge 204 forms a clearance area at the installation position corresponding to the sealing structure 100. Specifically, the guide ridge 204 is broken at the clearance area to form a first guide ridge segment 205 and a second guide ridge segment 206 arranged axially at intervals. The first guide ridge segment 205 is located above the installation area of ​​the seal 400, and the second guide ridge segment 206 is located below the installation area of ​​the seal 400. The installation area of ​​the seal 400 is between the first guide ridge segment 205 and the second guide ridge segment 206.

[0039] The outer periphery of the rod body 200 is also provided with an annular recess 201, which is an inwardly recessed annular groove formed along the circumference of the outer periphery of the rod body 200. No guide protrusion 204 passes through the annular recess. The annular recess 201 has two axially opposite sidewalls 202.

[0040] The rod body 200 has a positioning recess 203 below the installation area of ​​the corresponding sealing structure 100. The positioning recess 203 is a recessed hole opened on the outer periphery of the rod body 200. In this embodiment, there are two positioning recesses 203, which are symmetrically arranged on the rod body 200 and located on both sides of the second guide protrusion segment 206.

[0041] Support component 300 The support member 300 is composed of multiple ring segments 301 spliced ​​together. In this embodiment, the support member 300 is formed by splicing two ring segments 301 to form a complete ring. Each ring segment 301 is semi-ring-shaped, and the structures of the two ring segments 301 are symmetrical to each other.

[0042] Each ring segment 301 is sequentially divided into a mating segment 304, an interlocking segment 305, and an extension segment 306 along the axial direction. The interlocking segment 305 is located between the mating segment 304 and the extension segment 306, and an interlocking structure 303 is provided on the interlocking segment 305. Adjacent ring segments 301 are spliced ​​together to form a complete ring by interlocking structures 303 provided on their respective splicing surfaces 302.

[0043] The interlocking structure 303 includes a cavity 309 on the splicing surface 302 of one ring segment 301 and a protrusion 308 on the splicing surface 302 of another ring segment 301. Both the cavity 309 and the protrusion 308 are located in the middle of the ring segment 301, i.e., the interlocking segment 305 region. The cavity 309 is a rectangular recess, and the protrusion 308 is a rectangular protrusion that matches the shape of the cavity 309. During splicing, the protrusion 308 is aligned with the cavity 309 and pressed into place, achieving interlocking splicing of adjacent ring segments 301. The interlocking structure 303, located in the middle of the ring segment 301 and supported by material on both sides, has high structural strength and a stable splicing.

[0044] The support member 300 is embedded in the annular recess 201 of the rod body 200. Specifically, the fitting section 304 and the interlocking section 305 of the support member 300 are embedded in the annular recess 201. The end face of the fitting section 304 abuts against the upper side wall 202 of the annular recess 201, and the end face of the interlocking section 305 abuts against the lower side wall 202 of the annular recess 201. By having the end faces of the fitting section 304 and the interlocking section 305 abut against the two opposite side walls 202 of the annular recess 201 respectively, the support member 300 is bidirectionally limited in the axial direction, preventing the support member 300 from moving axially or coming out during the raising and lowering of the rod body 200.

[0045] The extension 306 of the support member 300 is located outside the annular recess 201, that is, the extension 306 extends axially beyond the range of the annular recess 201. The inner diameter of the extension 306 is larger than the inner diameter of the fitting section 304 and the interlocking section 305, and is formed by providing an annular groove on the inner circumferential surface of the extension 306.

[0046] The support member 300 is also provided with a slot 307. The slot 307 is axially provided on the wall surface of the support member 300, and the second guide ridge segment 206 of the guide ridge 204 is adapted to be accommodated in the slot 307. The cooperation between the slot 307 and the second guide ridge segment 206 can play a circumferential positioning role, which facilitates installation and prevents the support member 300 from deflecting around the axis of the rod body 200 during use.

[0047] Seal 400 The seal 400 is a Y-shaped sealing ring made of elastic material, with a Y-shaped opening 401. For a pneumatic lifting mast, taking the top support and the second-to-top support as examples, when the top support rises relative to the second-to-top support, the gas at the bottom rises, and the Y-shaped opening 401 of the Y-shaped seal contracts, reducing contact with the second-to-top support, making the ascent easier. Conversely, when the top support descends, the Y-shaped seal is subjected to the upward force of the gas at the bottom, and the Y-shaped opening 401 expands, buffering the descent and preventing rapid descent that could cause damage or injury to the operator. Furthermore, there is no need to install the seal 400 in the piston mounting groove below the top support; it can be directly positioned and fitted onto the outer ring of the top support, effectively utilizing space and saving costs. The seal 400 is fitted onto the outer periphery of the mast body 200, located within the area enclosed by the extension 306 of the support member 300. The seal 400 is located in the mounting area between the first guide ridge segment 205 and the second guide ridge segment 206, and its axial position is defined by the distance between the first guide ridge segment 205 and the second guide ridge segment 206.

[0048] One end face of the seal 400 abuts against the end face of the extension 306 of the support 300, and the other end face abuts against the positioning member 500. The seal 400 is axially clamped between the support 300 and the positioning member 500.

[0049] Positioning component 500 The positioning component 500 is assembled from at least one positioning unit 501. In this embodiment, the positioning component 500 consists of two separate positioning units 501, each positioning unit 501 having a positioning protrusion 502. The positioning protrusion 502 is a columnar structure protruding from the inner wall of the positioning unit 501 toward the rod 200.

[0050] The positioning element 500 is fixed by inserting the positioning protrusion 502 into the positioning recess 203 on the rod body 200. During installation, the positioning element 500 is fixed by aligning the positioning protrusion 502 of the positioning unit 501 with the positioning recess 203 on the rod body 200 and inserting it. After installation, the end face of the positioning element 500 facing the seal 400 abuts against the seal 400, forming a contact or pressing against the seal 400, and reliably positioning the seal 400 between the support element 300 and the positioning element 500.

[0051] The positioning units 501 of the positioning member 500 are located on both sides of the second guide ridge segment 206. That is, the positioning unit 501 avoids the guide ridge 204 in the circumferential direction and forms an interlaced layout with the second guide ridge segment 206, so that the positioning member 500 can be fixed to the rod 200 through the positioning protrusion 502, and will not interfere with the guide ridge 204.

[0052] Installation and working principle of sealing structure 100 During installation, firstly, place the two ring segments 301 of the support member 300 into the annular recess 201 of the rod body 200. Then, embed the fitting section 304 and the interlocking section 305 of the support member 300 into the annular recess 201. Align the slot 307 with the second guide protrusion section 206. The two ring segments 301 are spliced ​​together by the interlocking structure 303, i.e., the corresponding protrusions 308 are aligned with the cavity 309 and embedded, so that the two ring segments 301 are spliced ​​together to form a complete ring. At this time, the end face of the fitting section 304 of the support member 300 abuts against the upper side wall 202 of the annular recess 201, and the end face of the interlocking section 305 abuts against the lower side wall 202 of the annular recess 201, thereby achieving axial positioning.

[0053] Then, the seal 400 is fitted onto the outer periphery of the rod 200 and pushed to the position between the first guide protrusion 205 and the second guide protrusion 206, so that one end face of the seal 400 abuts against the support 300.

[0054] Finally, install the positioning component 500. Align the positioning protrusion 502 of the positioning unit 501 with the positioning recess 203 on the rod body 200 and insert it, so that the end face of the positioning component 500 abuts against the other end face of the sealing component 400, thus pressing the sealing component 400. The sealing component 400 is axially compressed between the support component 300 and the positioning component 500. Under the action of axial compression force, the sealing component 400 undergoes radial expansion deformation, causing its inner circumferential surface to fit more tightly against the outer circumference of the rod body 200, forming a reliable axial sealing effect.

[0055] After the sealing structure 100 is installed, the support member 300, the seal member 400, and the positioning member 500 are stacked sequentially along the axial direction of the mast body 200. The support member 300 provides axial support for the seal member 400, and the positioning member 500 provides axial compression to the seal member 400, so that the seal member 400 is reliably clamped between the two. When the mast body 200 moves up and down relative to the outer mast body 200, the sealing structure 100 moves together with the mast body 200, and the seal member 400 always maintains a tight fit with the outer mast body 200, effectively preventing rainwater, dust, and other debris from seeping into the mast through the gaps in the mast body 200.

[0056] Disassembly and maintenance When the seal 400 needs to be replaced, simply remove the positioning part 500 from the rod 200 to remove the seal 400 from the end of the rod 200 for replacement. There is no need to remove the rod 200 or other parts, making maintenance convenient and quick.

[0057] 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 number of ring segments 301 of the support member 300, the specific shape of the interlocking structure 303, the material and cross-sectional shape of the sealing member 400, and the number and arrangement of the positioning units 501, 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 sealing structure for a lifting mast, characterized in that, The sealing structure (100) is located on the outer periphery of the rod body (200) and includes a support member (300), a sealing member (400) and a positioning member (500) arranged sequentially along the axial direction; The support member (300) is composed of multiple ring segments (301) spliced ​​together. Adjacent ring segments (301) are spliced ​​together by interlocking structures (303) provided on their respective splicing surfaces (302). The inner periphery of the support member (300) is positioned and matched with the outer periphery of the rod (200). The positioning component (500) is separately installed on the rod body (200); The seal (400) is sandwiched between the support (300) and the positioning element (500).

2. The sealing structure of the lifting mast according to claim 1, characterized in that, After the sealing structure (100) is installed, the support (300), the seal (400) and the positioning element (500) are stacked sequentially along the axial direction of the rod (200). The support (300) supports the seal (400), and the positioning element (500) abuts or presses against the seal (400). The seal (400) is positioned between the support (300) and the positioning element (500) or is axially compressed between the support (300) and the positioning element (500).

3. The sealing structure of the lifting mast according to claim 1, characterized in that, The outer periphery of the rod (200) is provided with an annular recess (201), and the support member (300) is embedded in the annular recess (201). The two end faces of the support member (300) along the axial direction, which correspond to the two opposite side walls (202) of the annular recess (201), respectively abut against the two side walls (202) of the annular recess (201) to realize the axial positioning of the support member (300).

4. The sealing structure of the lifting mast according to claim 3, characterized in that, Each ring segment (301) of the support member (300) includes a fitting segment (304), an interlocking segment (305) and an extension segment (306) arranged sequentially along the axial direction. The interlocking segment (305) is provided with the interlocking structure (303). The fitting segment (304) and the interlocking segment (305) are fitted in the annular recess (201). The end face of the fitting segment (304) abuts against one side wall (202) of the annular recess (201), and the end face of the interlocking segment (305) abuts against the other side wall (202) of the annular recess (201).

5. The sealing structure of the lifting mast according to claim 4, characterized in that, The extension section (306) is located outside the annular recess (201). The inner diameter of the extension section (306) is larger than the inner diameter of the fitting section (304) and the interlocking section (305). The inner circumference of the extension section (306) abuts against the outer circumference of the rod (200).

6. The sealing structure of the lifting mast according to claim 1, characterized in that, The positioning component (500) is assembled from at least one positioning unit (501). The positioning unit (501) is provided with a positioning protrusion (502), and the rod body (200) is provided with a corresponding positioning recess (203). The positioning component (500) is fixed by inserting the positioning protrusion (502) into the positioning recess (203).

7. The sealing structure of the lifting mast according to claim 1, characterized in that, The outer periphery of the rod (200) is provided with a guide ridge (204) along the axial direction. The guide ridge (204) forms a clearance area at the installation position of the corresponding sealing structure (100). The support member (300) is provided with a slot (307), and a section of the guide ridge (204) is adapted to be placed in the slot (307).

8. The sealing structure of the lifting mast according to claim 7, characterized in that, The guide rib (204) is broken at the avoidance area to form a first guide rib segment (205) and a second guide rib segment (206) that are axially spaced apart; the seal (400) is located between the first guide rib segment (205) and the second guide rib segment (206); the first guide rib segment (205) is located in the slot (307); the positioning units (501) of the positioning member (500) are located on both sides of the second guide rib segment (206).

9. The sealing structure of the lifting mast according to claim 1, characterized in that, The interlocking structure (303) of adjacent ring segments (301) includes a cavity (309) on the splicing surface (302) of one ring segment (301) and a protrusion (308) on the splicing surface (302) of another ring segment (301). The protrusion (308) is embedded in the cavity (309) to achieve splicing of adjacent ring segments (301). Both the cavity (309) and the protrusion (308) are located in the middle of the ring segment (301).

10. The sealing structure of the lifting mast according to claim 1, characterized in that, The sealing structure (100) is located on the outer periphery of one end of the rod (200), the rod (200) is the top support rod located in the innermost ring of the lifting mast, and the sealing element (400) is a Y-shaped sealing ring.

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