Plug-in type extension ladder based on valve lifting lugs

Abstract

The utility model relates to a plug-in type extension ladder based on a valve lifting lug, which comprises a lower main ladder (1) and an upper auxiliary ladder (2), the lower main ladder (1) is provided with a guide rail, the upper auxiliary ladder (2) is provided with a rail groove, the upper auxiliary ladder (2) can slide up and down on the lower main ladder (1), and an up-down sliding mechanism and a slider-crank mechanism (20) are arranged between the lower main ladder (1) and the upper auxiliary ladder (2). According to the extension ladder disclosed by the utility model, the upper auxiliary ladder (2) can slide up and down on the lower main ladder (1) through the up-down sliding mechanism, so that the height of the whole ladder is adjusted; the transverse telescopic amount of the telescopic ladder is large through the crank sliding block mechanism (20), and the telescopic ladder is suitable for valve lifting lugs of different sizes and has the advantage of being wide in application range. The distance between the extension ladder and the valve can be adjusted through the adjusting rod, the angle between the extension ladder and the valve can be adjusted, the application scene of the extension ladder is increased, and therefore the problem that the adjusting range is small is solved.

Description

Technical Field

[0001] This utility model belongs to the field of gate valve technology, specifically relating to an insertable telescopic ladder based on a valve lifting lug. Background Technology

[0002] Ladders are widely used in our daily lives. They consist of two long, thick bars with equidistant crossbars in the middle for climbing. They are mainly divided into single ladders and A-frame ladders based on their shape. Single ladders have a simple structure and are easy to operate; A-frame ladders are relatively safe, reliable, and stable. Currently, single ladders are large and inconvenient to carry, and their functionality is limited; A-frame ladders have a fixed fork angle and a small adjustment range, making them less practical. Using a single ladder for valve installation can easily scratch the valve's outer wall or actuator, while using an A-frame ladder requires frequent changes in ladder position, making the operation cumbersome. Furthermore, both single and A-frame ladders suffer from limited adjustment range and limited functionality.

[0003] For example, Chinese invention patent application CN 119466536 A discloses a foldable telescopic ladder, including a platform portion; a tread portion connected to one end of the platform portion that can be flipped; the tread portion having an inner ladder and an outer ladder; the left and right side walls of the inner ladder having multiple positioning holes at different positions along its length; the outer ladder having a rotary telescopic positioning connection structure, which can be fixedly installed on the outer ladder and operably inserted into the positioning holes, so as to operably position or slide the outer ladder to the outside of the inner ladder, allowing the outer ladder to be positioned at different positions along the extension direction of the inner ladder. However, this telescopic ladder can only be adjusted in height, making it unsuitable for places with different widths, and its bottom stability is poor. Summary of the Invention

[0004] To address the problems existing in the prior art, this utility model proposes an insertable telescopic ladder based on valve lifting lugs. By setting a crank-slider mechanism, the entire telescopic ladder can be extended and retracted laterally, making it suitable for valve lifting lugs of different sizes and thus having a wider range of applications.

[0005] This invention proposes an insertable telescopic ladder based on valve lifting lugs, comprising a lower main ladder and an upper auxiliary ladder. The lower main ladder is equipped with guide rails, and the upper auxiliary ladder has rail grooves. The upper auxiliary ladder can slide up and down on the lower main ladder. A sliding mechanism and a crank-slider mechanism are provided between the lower main ladder and the upper auxiliary ladder. This telescopic ladder allows the upper auxiliary ladder to slide up and down on the lower main ladder via the sliding mechanism, thereby adjusting the overall height of the ladder. The crank-slider mechanism allows for a large lateral extension range, making it suitable for valve lifting lugs of different sizes, thus offering a wide range of applications. Furthermore, the distance between the telescopic ladder and the valve, as well as the angle between the telescopic ladder and the valve, can be adjusted via an adjusting rod, increasing the applicable scenarios and solving the problem of limited adjustment range.

[0006] Preferably, the sliding mechanism includes a slider, a sliding rod, a pulley block, and a first pull rope. There are two sliders, located on either side of the lower main ladder; the two sliders are connected together by the sliding rod; the pulley block is located at the junction of the lower main ladder and the upper auxiliary ladder. During operation, the worker can adjust the height of the entire telescopic ladder by pulling the first pull rope.

[0007] In any of the above embodiments, it is preferred that the slide rod has adjusting rods on both sides, and the adjusting rods have oblong holes. During operation, the distance between the telescopic ladder and the valve can be adjusted by the sliding of the stud within the oblong hole driven by the crank-slider mechanism, as well as the angle of the telescopic ladder can be adjusted, thus increasing the applicable scenarios of the telescopic ladder and solving the problem of small adjustment range.

[0008] In any of the above embodiments, it is preferred that the crank-slider mechanism includes a middle cylinder, a crank, a connecting rod, a fixed tube, and a telescopic tube, with the fixed tube and the telescopic tube located at opposite axial ends of the middle cylinder; the lower end of the middle cylinder is connected to the crank.

[0009] In any of the above embodiments, it is preferred that the crank and the middle cylinder, the crank and the connecting rod, and the connecting rod and the telescopic tube are all connected by hinge pins to form a crank mechanism.

[0010] In any of the above embodiments, it is preferred that a spring is provided between the crank and the middle cylinder, and the pulling of the spring can cause the telescopic tube to return to its original position.

[0011] In any of the above embodiments, it is preferred that the crank is provided with a second pull rope.

[0012] In any of the above embodiments, it is preferred that one end of the adjusting rod is connected to the sliding rod, and the other end is connected to the support arm via a stud; the end of the support arm is connected to the middle cylinder; and the stud is located inside the oblong hole of the adjusting rod. During operation, the distance between the telescopic ladder and the valve, as well as the angle of the telescopic ladder, can be adjusted by the crank-slider mechanism driving the stud to slide within the oblong hole of the adjusting rod, thus increasing the applicable scenarios of the telescopic ladder and solving the problem of a small adjustment range.

[0013] In any of the above solutions, it is preferred that the fixed pipe and the telescopic pipe are both located in the valve lifting lug after installation, and the valve lifting lug provides partial support. The base bears most of the load. Unlike the situation where the load is borne at both ends of a typical telescopic ladder, this utility model can avoid scratches on the valve due to excessive local stress, and effectively ensure the surface quality and working stability of the valve.

[0014] In any of the above solutions, it is preferred that the bottom of the lower main ladder is provided with a base to ensure the contact area between the telescopic ladder and the ground and increase the stability of the telescopic ladder.

[0015] In summary, the plug-in telescopic ladder based on valve lifting lugs of this utility model has the following advantages: It features a crank-slider mechanism; during operation, simply pulling the rope retracts the telescopic tube connected to the central cylinder, aligning the tube with the valve lifting lug. The spring installed on the crank and central cylinder then resets the tube, allowing it to be inserted into the lug. The ladder has a large lateral telescopic range, making it suitable for valve lifting lugs of different sizes, thus offering a wide range of applications. The adjusting rod has a waist-shaped hole, allowing for adjustable distance between the ladder and the valve, as well as adjustable ladder angle, increasing the ladder's applicability and solving the problem of limited adjustment range. Furthermore, in this telescopic ladder, the valve lifting lug provides partial support, while the base bears most of the load. Unlike typical telescopic ladders where the load is distributed at both ends, this utility model prevents scratches on the valve due to excessive localized stress, effectively ensuring valve surface quality and operational stability. The base installed at the bottom of the main ladder ensures sufficient contact area between the ladder and the ground, increasing the ladder's stability.

[0016] Explanation of icon numbers

[0017] 1. Lower main ladder, 2. Upper auxiliary ladder, 3. Slider, 4. Sliding rod, 5. Adjusting rod, 6. Pulley block, 7. First pull rope, 8. Middle cylinder, 9. Support arm, 10. Stud, 11. Fixed tube, 12. Telescopic tube, 13. Crank, 14. Connecting rod, 15. Hinge pin, 16. Spring, 17. Second pull rope, 18. Base, 19. Waist-shaped hole, 20. Crank-slider mechanism. Attached Figure Description

[0018] Figure 1 This is a structural schematic diagram of a preferred embodiment of the insertable telescopic ladder based on valve lugs according to the present invention.

[0019] Figure 2 In accordance with this utility model, an insertable telescopic ladder based on valve lugs is used. Figure 1 A schematic diagram of the rear structure of the preferred embodiment is shown.

[0020] Figure 3 In accordance with this utility model, an insertable telescopic ladder based on valve lugs is used. Figure 1 A schematic diagram of the crank-slider mechanism in the preferred embodiment is shown.

[0021] Figure 4 In accordance with this utility model, an insertable telescopic ladder based on valve lugs is used. Figure 1 The diagram shows a schematic representation of the adjusting rod in the preferred embodiment. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] like Figure 1 , Figure 2 As shown, an insertable telescopic ladder based on valve lifting lugs includes a lower main ladder 1 and an upper auxiliary ladder 2. The lower main ladder 1 is equipped with guide rails, and the upper auxiliary ladder 2 has rail grooves. The upper auxiliary ladder 2 can slide up and down on the lower main ladder 1. A sliding mechanism and a crank-slider mechanism 20 are provided between the lower main ladder 1 and the upper auxiliary ladder 2. This telescopic ladder allows the upper auxiliary ladder 2 to slide up and down on the lower main ladder 1 through the sliding mechanism, thereby adjusting the height of the entire ladder. The crank-slider mechanism 20 allows for a large lateral telescopic range, making it suitable for valve lifting lugs of different sizes and possessing a wide range of applications. Furthermore, the distance between the telescopic ladder and the valve, as well as the angle between the telescopic ladder and the valve, can be adjusted via an adjusting rod, increasing the applicable scenarios of the telescopic ladder and thus solving the problem of limited adjustment range.

[0024] In this embodiment, adjusting rods 5 are provided on both sides of the sliding rod 4, and the adjusting rods 5 have oblong holes 19 (see...). Figure 4 (As shown). During operation, the distance between the telescopic ladder and the valve can be adjusted by driving the stud 10 to slide within the oblong hole 19 through the crank-slider mechanism 20, and the angle of the entire telescopic ladder can be adjusted by rotating the crank-slider mechanism 20, thereby increasing the applicable scenarios of the telescopic ladder and solving the problem of small adjustment range.

[0025] In this embodiment, one end of the adjusting rod 5 is connected to the slide rod 4, and the other end is connected to the support arm 9 via a stud 10; the end of the support arm 9 is connected to the middle cylinder 8; the stud 10 is located inside the oblong hole 19 of the adjusting rod 5. During operation, the angle of the entire telescopic ladder is adjustable by rotating the crank-slider mechanism 20, increasing the applicable scenarios of the telescopic ladder and thus solving the problem of a small adjustment range.

[0026] In this embodiment, the bottom of the lower main ladder 1 is provided with a base 18 to ensure the contact area between the telescopic ladder and the ground and increase the stability of the telescopic ladder.

[0027] See Figure 2 As shown, in the insertable telescopic ladder based on valve lugs according to this utility model... Figure 1 A schematic diagram of the rear structure of the preferred embodiment is shown.

[0028] In this embodiment, the sliding mechanism includes a slider 3, a sliding rod 4, a pulley block 6, and a first pull rope 7. There are two sliders 3, located on either side of the lower main ladder 1; the two sliders 3 are connected together by the sliding rod 4; the pulley block 6 is located at the junction of the lower main ladder 1 and the upper auxiliary ladder 2. During operation, the worker can adjust the height of the entire telescopic ladder by pulling the first pull rope 7.

[0029] like Figure 3 As shown, in the insertable telescopic ladder based on valve lugs according to this utility model... Figure 1A schematic diagram of the crank-slider mechanism in the preferred embodiment is shown.

[0030] In this embodiment, the crank-slider mechanism 20 includes a middle cylinder 8, a crank 13, a connecting rod 14, a fixed tube 11, and a telescopic tube 12. The fixed tube 11 and the telescopic tube 12 are located at the two axial ends of the middle cylinder 8, respectively. The lower end of the middle cylinder 8 is connected to the crank 13.

[0031] In this embodiment, the crank 13 is connected to the middle cylinder 8, the crank 13 is connected to the connecting rod 14, and the connecting rod 14 is connected to the telescopic tube 12 through hinge pins 15, thereby forming a crank mechanism.

[0032] In this embodiment, a spring 16 is provided between the crank 13 and the middle cylinder 8, and the pulling of the spring 16 can reset the telescopic tube 12.

[0033] In this embodiment, a second pull rope 17 is provided on the crank 13.

[0034] The working process of this utility model's insertable telescopic ladder based on valve lifting lugs is as follows: First, the operator pre-adjusts the height of the entire telescopic ladder according to the actual situation, that is, changes the length of the entire telescopic ladder through the slide rail on the lower main ladder 1 and the slide groove on the upper auxiliary ladder 2, and fixes it with bolts; Second, the fixing pipe 11 connected to the middle cylinder 8 is inserted into one of the valve lifting lugs, and then the second pull rope 17 is pulled down to drive the crank 13 to rotate, thereby driving the connecting rod 14, which in turn causes the telescopic pipe 12 to retract. Then, the telescopic pipe 12 is axially aligned with the other lifting lug of the valve, and reset by the spring 16, so that... The telescopic tube 12 is inserted into the other lifting lug of the valve to provide support at the lug. In the third step, the position of the slider 3 and the sliding rod 4 on the lower main ladder 1 is adjusted by pulling the first pull rope 7, so that the vertical height of the stud 10 on the support arm 9 is within the adjustable range of the oblong hole 19 of the adjusting rod 5. The distance between the telescopic ladder and the valve is adjusted by sliding the stud 10 in the oblong hole 19. Then, the angle of the crank slider mechanism 20 is adjusted by the stud 10. The support arm 9 and the adjusting rod 5 are fixed with bolts. Finally, the position and angle of the telescopic ladder are finely adjusted by the base 18, so that the height and angle of the telescopic ladder can be adjusted.

[0035] In this embodiment, the fixed pipe 11 and the telescopic pipe 12 are both located in the valve lifting lug after installation. They are partially supported by contact at the valve lifting lug, and the base bears most of the load. Unlike the situation where the load is borne at both ends of a typical telescopic ladder, this utility model can avoid the valve from being scratched due to excessive local stress, and effectively ensures the surface quality and working stability of the valve.

[0036] Those skilled in the art will readily understand that the insertable telescopic ladder based on valve lugs of this utility model includes any combination of the parts described in this specification. Due to space limitations and for the sake of brevity, these combinations are not described in detail here, but after reading this specification, the scope of this utility model, which consists of any combination of the parts described in this specification, is self-evident.

Claims

1. An insertable telescopic ladder based on a valve lifting lug, comprising a lower main ladder (1) and an upper auxiliary ladder (2), wherein the lower main ladder (1) is provided with a guide rail, and the upper auxiliary ladder (2) has a rail groove, and the upper auxiliary ladder (2) can slide up and down on the lower main ladder (1), characterized in that: A sliding mechanism and a crank-slider mechanism (20) are provided between the lower main ladder (1) and the upper auxiliary ladder (2).

2. The insertable telescopic ladder based on valve lugs as described in claim 1, characterized in that: The sliding mechanism includes a slider (3), a sliding rod (4), a pulley block (6) and a first pull rope (7). There are two sliders (3), which are located on both sides of the lower main ladder (1). The two sliders (3) are connected together by the sliding rod (4). The pulley block (6) is located at the junction of the lower main ladder (1) and the upper auxiliary ladder (2).

3. The insertable telescopic ladder based on valve lugs as described in claim 2, characterized in that: Adjusting rods (5) are provided on both sides of the sliding rod (4), and waist-shaped holes (19) are opened on the adjusting rods (5).

4. The insertable telescopic ladder based on valve lugs as described in claim 1, characterized in that: The crank-slider mechanism (20) includes a middle cylinder (8), a crank (13), a connecting rod (14), a fixed tube (11), and a telescopic tube (12). The fixed tube (11) and the telescopic tube (12) are located at the two ends of the axial direction of the middle cylinder (8), respectively. The lower end of the middle cylinder (8) is connected to the crank (13).

5. The insertable telescopic ladder based on valve lugs as described in claim 4, characterized in that: The crank (13) is connected to the middle cylinder (8), the crank (13) is connected to the connecting rod (14), and the connecting rod (14) is connected to the telescopic tube (12) by hinge pins (15).

6. The insertable telescopic ladder based on valve lugs as described in claim 4 or 5, characterized in that: A spring (16) is provided between the crank (13) and the middle cylinder (8).

7. The insertable telescopic ladder based on valve lugs as described in claim 4 or 5, characterized in that: A second pull rope (17) is provided on the crank (13).

8. The insertable telescopic ladder based on valve lugs as described in claim 3, characterized in that: One end of the adjusting rod (5) is connected to the slide rod (4), and the other end is connected to the support arm (9) through the stud (10); the end of the support arm (9) is connected to the middle cylinder (8); the stud (10) is located in the waist-shaped hole (19) of the adjusting rod (5).

9. The insertable telescopic ladder based on valve lugs as described in claim 8, characterized in that: After installation, both the fixed pipe (11) and the telescopic pipe (12) are located in the valve lifting lug.

10. The insertable telescopic ladder based on valve lugs as described in claim 1, characterized in that: The bottom of the lower main ladder (1) is provided with a base (18).

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