Plug-in type extension ladder based on valve lifting lugs

Abstract

The invention relates to a plug-in 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, 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] The invention belongs to the technical field of stop valves, and in particular relates to an insertable telescopic ladder based on a valve lifting lug. Background Art

[0002] Ladders are widely used in our daily lives. They consist of two long, thick bars with equally spaced horizontal bars running through them, and are used for climbing. They are categorized by their appearance as single ladders and stepladders. Single ladders are simple and easy to operate, while stepladders are relatively safe, reliable, and stable. Currently, single ladders are large, difficult to carry, and have limited functionality. Stepladders have fixed angles and a narrow adjustment range, making them less practical. Using a single ladder for valve installation can easily scratch the valve's exterior or actuator, while stepladders require frequent repositioning, making operation more cumbersome. Furthermore, both single and stepladders suffer from limited adjustment ranges and limited functionality.

[0003] For example, Chinese invention patent application publication number CN 119466536 A discloses a foldable telescopic ladder comprising a platform portion; a step ladder portion reversibly connected to one end of the platform portion; the step ladder portion having an inner ladder and an outer ladder; the left and right side walls of the inner ladder having a plurality of positioning holes at different positions along its length; and the outer ladder having a rotary telescopic positioning connection structure that can be fixedly mounted on the outer ladder and maneuverably inserted into the positioning holes to maneuverably position or slidably connect the outer ladder to the outside of the inner ladder, allowing the outer ladder to be positioned and connected to different positions along the extension direction of the inner ladder. However, this telescopic ladder can only be adjusted in height and is not suitable for use in places with different widths, and its base is unstable. Summary of the Invention

[0004] In response to the problems existing in the prior art, the present invention proposes an insertable telescopic ladder based on a valve lifting lug. By setting a crank slider mechanism, the entire telescopic ladder can be extended and retracted in the horizontal direction, which can be applied to valve lifting lugs of different sizes and has a wider range of applications.

[0005] The present invention proposes an insertable telescopic ladder based on a valve lifting lug, which includes a lower main ladder and an upper auxiliary ladder. The lower main ladder is provided with a guide rail, and the upper auxiliary ladder is provided with a rail groove. The upper auxiliary ladder can slide up and down on the lower main ladder, and an up and down sliding mechanism and a crank slider mechanism are provided between the lower main ladder and the upper auxiliary ladder. The telescopic ladder of the present invention enables the upper auxiliary ladder to slide up and down on the lower main ladder through the up and down sliding mechanism, thereby adjusting the height of the entire ladder; the crank slider mechanism enables the telescopic ladder to have a large lateral extension and contraction range, suitable for valve lifting lugs of different sizes, and has a wide range of applications; and the distance between the telescopic ladder and the valve and the angle with the telescopic ladder can be adjusted by adjusting the rod, which increases the applicable scenarios of the telescopic ladder and solves the problem of a small adjustment range.

[0006] Preferably, the up-and-down sliding mechanism includes a slider, a slide rod, a pulley assembly, and a first pull rope. The sliders are two, one located on either side of the lower main ladder; the two sliders are connected by the slide rod; and the pulley assembly is located at the junction of the lower main ladder and the upper auxiliary ladder. During operation, the operator can adjust the height of the entire telescopic ladder by pulling the first pull rope.

[0007] In any of the above solutions, preferably, adjustment rods are provided on both sides of the slide rod, each having a waist-shaped hole formed therein. During operation, the crank slider mechanism drives the stud to slide within the waist-shaped hole, thereby adjusting the distance between the telescopic ladder and the valve, as well as the angle of the telescopic ladder, thereby increasing the applicable scenarios of the telescopic ladder and solving the problem of a limited adjustment range.

[0008] In any of the above schemes, preferably, the crank slider mechanism includes a middle cylinder, a crank, a connecting rod, a fixed tube and a telescopic tube, the fixed tube and the telescopic tube are respectively located at the axial ends of the middle cylinder; the lower end of the middle cylinder is connected to the crank.

[0009] In any of the above solutions, 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 through a hinge pin, thereby forming a crank mechanism.

[0010] In any of the above solutions, preferably, a spring is provided between the crank and the middle tube, and the pulling of the spring can reset the telescopic tube.

[0011] In any of the above solutions, preferably, a second pull rope is provided on the crank.

[0012] In any of the above solutions, preferably, one end of the adjustment rod is connected to the slide bar, and the other end is connected to the support arm via a stud; the distal end of the support arm is connected to the middle tube; and the stud is located within the waist-shaped hole of the adjustment rod. During operation, the crank slider mechanism drives the stud to slide within the waist-shaped hole of the adjustment rod, thereby adjusting the distance between the telescopic ladder and the valve, as well as the angle of the telescopic ladder, thereby expanding the application scenarios of the telescopic ladder and solving the problem of a limited adjustment range.

[0013] In any of the above schemes, it is preferred that the fixed tube and the telescopic tube are both located in the valve lifting ear after installation, and the contact at the valve lifting ear serves as partial support, and the base bears most of the load. This is different from the situation where the upper and lower ends of a general telescopic ladder bear the weight. The present invention can avoid scratches on the valve due to excessive local force, and effectively ensure the surface quality and working stability of the valve.

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

[0015] To sum up, the insertable telescopic ladder based on the valve lifting ear of the present invention has the following advantages: a crank slider mechanism is provided, and during the specific operation, it is only necessary to pull the pull rope to drive the telescopic tube connected to the middle cylinder to retract, align the telescopic tube with the valve lifting ear, and reset it through the spring installed on the crank and the middle cylinder, so that it is inserted into the lifting ear; the telescopic ladder has a large lateral retractable range, so it can be suitable for valve lifting ears of different sizes, and has the characteristics of a wide range of applications; a waist-shaped hole is provided on the adjusting rod, which can realize the adjustable distance between the telescopic ladder and the valve, as well as the adjustable angle of the telescopic ladder, thereby increasing the applicable scenarios of the telescopic ladder and solving the problem of a small adjustment range; in addition, in the telescopic ladder; the contact at the valve lifting ear serves as partial support, and the base bears most of the load, which is different from the situation where the upper and lower ends of the general telescopic ladder bear weight. The present invention can avoid scratches on the valve due to excessive local force, effectively ensuring the surface quality and working stability of the valve; the base installed at the bottom of the main ladder ensures the contact area between the telescopic ladder and the ground, thereby increasing the stability of the telescopic ladder.

[0016] Explanation of Figure Numbers

[0017] Lower main ladder 1, upper auxiliary ladder 2, slider 3, slide rod 4, adjusting rod 5, pulley set 6, first pull rope 7, middle cylinder 8, support arm 9, stud 10, fixed tube 11, telescopic tube 12, crank 13, connecting rod 14, hinge pin 15, spring 16, second pull rope 17, base 18, waist-shaped hole 19, crank slider mechanism 20. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0019] Figure 2 For the insertion type telescopic ladder based on the valve lifting lug according to the present invention Figure 1 A schematic diagram of the back structure of the preferred embodiment is shown.

[0020] Figure 3 For the insertion type telescopic ladder based on the valve lifting lug according to the present invention Figure 1 A schematic structural diagram of the crank slider mechanism in the preferred embodiment is shown.

[0021] Figure 4 For the insertion type telescopic ladder based on the valve lifting lug according to the present invention Figure 1 The schematic diagram of the structure of the adjusting rod in the preferred embodiment is shown. DETAILED DESCRIPTION

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

[0023] like Figure 1 、 Figure 2As shown, a plug-in telescopic ladder based on a valve lifting lug includes a lower main ladder 1 and an upper auxiliary ladder 2. The lower main ladder 1 is provided with a guide rail, and 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. An up and down sliding mechanism and a crank slider mechanism 20 are provided between the lower main ladder 1 and the upper auxiliary ladder 2. The telescopic ladder of the present invention enables the upper auxiliary ladder 2 to slide up and down on the lower main ladder 1 through the up and down sliding mechanism, thereby adjusting the height of the entire ladder; the crank slider mechanism 20 enables the telescopic ladder to have a large lateral extension and contraction range, suitable for valve lifting lugs of different sizes, and has a wide range of applications; and the distance between the telescopic ladder and the valve and the angle with the telescopic ladder can be adjusted by adjusting the rod, which increases the applicable scenarios of the telescopic ladder and solves the problem of a small adjustment range.

[0024] In this embodiment, the two sides of the slide bar 4 are provided with adjustment rods 5, and the adjustment rods 5 are provided with waist-shaped holes 19 (see FIG. Figure 4 During operation, the distance between the telescopic ladder and the valve can be adjusted by driving the stud 10 to slide in the waist-shaped 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 a small adjustment range.

[0025] In this embodiment, one end of the adjustment rod 5 is connected to the slide bar 4, and the other end is connected to the support arm 9 via a stud 10. The distal end of the support arm 9 is connected to the middle tube 8. The stud 10 is located within the waist-shaped hole 19 of the adjustment rod 5. During operation, the entire telescopic ladder can be adjusted by rotating the crank slider mechanism 20, expanding the application scenarios of the telescopic ladder and solving the problem of a limited adjustment range.

[0026] In this embodiment, a base 18 is provided at the bottom of the lower main ladder 1 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, according to the plug-in telescopic ladder based on the valve lifting lug of the present invention Figure 1 A schematic diagram of the back structure of the preferred embodiment is shown.

[0028] In this embodiment, the up-and-down sliding mechanism includes a slider 3, a slide bar 4, a pulley assembly 6, and a first pull rope 7. The slider 3 consists of two pieces, one located on either side of the lower main ladder 1; the two sliders 3 are connected by a slide bar 4; and the pulley assembly 6 is located at the junction of the lower main ladder 1 and the upper auxiliary ladder 2. During operation, the operator adjusts the height of the entire telescopic ladder by pulling the first pull rope 7.

[0029] like Figure 3 As shown, according to the plug-in telescopic ladder based on the valve lifting lug of the present invention Figure 1A schematic structural 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 respectively located at the axial ends of the middle cylinder 8; the lower end of the middle cylinder 8 is connected to the crank 13.

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

[0032] In this embodiment, a spring 16 is provided between the crank 13 and the middle tube 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 the plug-in telescopic ladder based on the valve lifting lug of the present invention is as follows: first, the staff pre-adjusts the height of the entire telescopic ladder according to actual conditions, 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 tube 11 connected to the middle cylinder 8 is inserted into one of the lifting lugs of the valve, and then the crank 13 is rotated by pulling the second pull rope 17 downward, thereby driving the connecting rod 14, thereby driving the telescopic tube 12 to retract, and then the telescopic tube 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 extended into the other lifting ear of the valve to complete the support at the lifting ear; in the third step, the position of the slider 3 and the slide 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 waist-shaped hole 19 of the adjusting rod 5, and the distance between the telescopic ladder and the valve is adjusted by sliding the stud 10 in the waist-shaped hole 19, and then the angle of the crank slider mechanism 20 is adjusted by the stud 10, and the support arm 9 and the adjusting rod 5 are fixed with bolts. Finally, the position and angle of the telescopic ladder can be fine-tuned through the base 18, and the height and angle adjustment of the telescopic ladder can be finally achieved.

[0035] In this embodiment, the fixed tube 11 and the telescopic tube 12 are both located in the valve lifting ear after installation, and the contact at the valve lifting ear serves as partial support, and the base bears most of the load. This is different from the situation where the upper and lower ends of a general telescopic ladder bear the weight. The present invention can avoid scratches on the valve due to excessive local force, and effectively ensure the surface quality and working stability of the valve.

[0036] Those skilled in the art will readily appreciate that the valve lug-based insertable telescopic ladder of the present invention encompasses any combination of the components described in this specification. Due to space limitations and to maintain clarity, these combinations are not described in detail here. However, after reading this specification, the scope of the present invention, encompassed by any combination of the components described herein, will be readily apparent.

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) is provided with a rail groove, and the upper auxiliary ladder (2) can slide up and down on the lower main ladder (1), characterized in that: An up-and-down sliding mechanism and a crank slider mechanism (20) are provided between the lower main ladder (1) and the upper auxiliary ladder (2).

2. The plug-in telescopic ladder based on the valve lifting lug according to claim 1, characterized in that: The up-and-down sliding mechanism comprises a slider (3), a slide bar (4), a pulley block (6) and a first pull rope (7); the slider (3) is composed of two pieces, which are respectively located on both sides of the lower main ladder (1); the two sliders (3) are connected together through the slide bar (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 the valve lifting lug according to claim 2, characterized in that: Adjusting rods (5) are provided on both sides of the slide bar (4), and waist-shaped holes (19) are formed on the adjusting rods (5).

4. The insertable telescopic ladder based on the valve lifting lug according to claim 1, characterized in that: The crank slider mechanism (20) comprises 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 respectively located at the axial ends of the middle cylinder (8); the lower end of the middle cylinder (8) is connected to the crank (13).

5. The insertable telescopic ladder based on the valve lifting lug according to claim 4, characterized in that: The crank (13) and the middle cylinder (8), the crank (13) and the connecting rod (14), and the connecting rod (14) and the telescopic tube (12) are all connected via a hinge pin (15).

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

9. The insertable telescopic ladder based on the valve lifting lug according to claim 8, characterized in that: After being installed, the fixed pipe (11) and the telescopic pipe (12) are both located in the valve lifting lug.

10. The insertable telescopic ladder based on valve lifting lug according to claim 1, characterized in that: A base (18) is provided at the bottom of the lower main ladder (1).

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