Negative angle limiting ladder capable of automatically counteracting gap and crane thereof

Abstract

The utility model discloses a negative angle limiting ladder capable of automatically offsetting a gap and a crane thereof. The negative angle limiting ladder comprises a movable ladder, a bent plate, a supporting structure, a fixed ladder and a handle type indexing pin with a fixed stop position, the bent plate and the fixed ladder are connected and fixed on a frame of the crane through bolts; a hole is formed in the side edge of the fixed ladder; a handle type indexing pin with a fixed stop position of the movable ladder can be inserted into the hole; the movable ladder is connected with the bent plate through a supporting structure, and limiting and folding during use are completed by rotating the supporting structure. The ladder is simple in structure and easy to implement, the efficiency of getting on and off a vehicle can be improved, and accidents caused by forgetting fixing operation can be avoided.

Description

Technical Field

[0001] The utility model relates to a position-limiting ladder, in particular to a negative-angle position-limiting ladder capable of automatically offsetting a gap and a crane thereof. Background Art

[0002] Ladders are widely used on cranes. Ladders are installed at the front, rear and side of the crane to facilitate operators to get on and off the crane. Due to the requirements of the industry standard on the approach angle and departure angle, and to increase the passability of the crane, the ladders of many cranes are generally required to have a folding function. Figure 1 shown.

[0003] Existing bolt-fixed ladders such as Figure 2 As shown, it is composed of a bent plate, a connecting chain, a fixed pin, a rotating pin shaft, an O-shaped card, a latch, a movable ladder, and a fixed ladder. The bent plate is connected to the frame by bolts, and the latch is hung on the bent plate through the connecting chain. The movable ladder uses the rotating pin shaft as a rotating axis for rotation and folding. The bent plate and the folding part of the ladder are both provided with openings, and the latch can be inserted therein for fixing during use and folding, and the O-shaped card is inserted into the head of the latch to fix it.

[0004] When the ladder is used, Figure 3 As shown, the operator needs to insert the latch into the hole of the bent plate and the stepladder to fix it, and insert the O-shaped card into the latch to climb. After use, the operator pulls out the latch, rotates and folds the stepladder, inserts the latch into the fixed hole to fix it, and finally inserts the O-shaped card into the latch again to complete the operation of folding the ladder.

[0005] In the prior art, Scheme 1: CN201810880097.8 A folding ladder for construction machinery, a folding ladder for construction machinery using a three-section structure is proposed, the first ladder section and the second ladder section are rotatably connected, the first ladder section can be rotated to a position overlapping with the second ladder section; the second ladder section and the third ladder section are slidably connected, and the second ladder section can be stored in the third ladder section; in the folding ladder for construction machinery, the first ladder section and the second ladder section are rotatably connected and folded in a superimposed manner, and the second ladder section and the third ladder section are slidably connected and folded in a retracted manner, which overcomes the problem of inflexible folding of multi-section telescopic folding ladders and makes the ladder in the folded state occupy less space. Scheme 2: CN202020606473.7 Ladder and construction vehicle, a ladder is proposed, including a ladder body and a clamping body. In the use state, the top and bottom of the ladder body are respectively pivotally connected to the vehicle body and the clamping body, and the clamping pin of the vehicle body is clamped into a selected one of the multiple clamping slots of the clamping body, so that the inclination angle between the ladder body and the vehicle body is in an ideal range. The ladder is provided with a clamping body, so that the inclination angle of the ladder body relative to the vehicle body can be adjusted by clamping, so that when the ladder is not needed, the angle formed between the ladder body and the vehicle body is as small as possible, so as to achieve the purpose of storing the ladder body. Solution 3: CN202221325516.X ladder and engineering vehicle, the utility model provides a movable ladder and an engineering vehicle, the movable ladder comprises a first ladder section and a second ladder section connected in rotation, the second ladder section has a flat position and a bent position relative to the first ladder section, the movable ladder also comprises a first limiting structure and a second limiting structure arranged between the first ladder section and the second ladder section, when the second ladder section rotates to the bent position, the first limiting structure is used to limit the second ladder section from rotating upward relative to the first ladder section, and the second limiting structure is used to limit the second ladder section from rotating downward relative to the first ladder section. In this way, the second ladder section can be stably maintained in the bent position when the movable ladder is in use, and is not easy to rotate up and down, which not only facilitates the operator to go up and down the movable ladder, but also improves the safety of the movable ladder when in use.

[0006] However, the prior art still has the following problems:

[0007] 1. Complicated operation: The existing ladder uses the pins and O-type cards on the connecting chain to fix the ladder when it is folded or used. The operation is cumbersome and requires frequent plugging and unplugging of the pins and O-type cards. Operators are prone to forget the fixing operation, resulting in accidents.

[0008] 2. Overall shaking: such as Figure 4 As shown, due to the tolerance between the shaft and the fixing hole, the ladder will shake greatly when in use, and the stability is poor, affecting the safety of people climbing up and down;

[0009] 3. Too many connectors and high cost: The connecting chain takes up a relatively large space, uses more materials, and has a high manufacturing cost; when both the latch and the O-shaped card are inserted, it will affect the climbing space in the ladder. Utility Model Content

[0010] Purpose of the utility model: The utility model aims to provide a negative angle limit ladder and its crane which can automatically offset the gap to prevent the ladder from shaking. This ladder is easy to operate, more stable, simple to manufacture and relatively low in cost.

[0011] Technical solution: The utility model discloses a negative angle limiting ladder capable of automatically offsetting the gap, comprising a movable ladder, a bent plate, a supporting structure, a fixed ladder and a handle-type indexing pin with a fixed stop position; the bent plate and the fixed ladder are fixed to the frame of the crane by bolts; a hole is opened on the side of the fixed ladder, and the handle-type indexing pin with a fixed stop position of the movable ladder can be inserted into the hole; the movable ladder is connected to the bent plate through the supporting structure, and the limiting and folding during use are completed by rotating the supporting structure.

[0012] Furthermore, the support structure is connected to the bent plate by welding, and the bent plate and the support structure are respectively opened with holes and are combined by bolts to form a rotating shaft of the foldable stepladder, which is used for the rotation and folding of the stepladder.

[0013] Furthermore, the opening on the side of the fixed ladder is a long hole, the width of the long hole is the same as the diameter of the handle-type indexing pin with a fixed position, and the length of the long hole is greater than the diameter of the handle-type indexing pin with a fixed position.

[0014] Furthermore, the supporting structure is an inclined surface limiting structure.

[0015] Furthermore, the support structure is provided with a wedge block, which is assembled at the bottom of the fixed ladder through fixing bolts and fixing nuts. The support structure is welded to the fixed ladder, and holes are opened and bolts are used to form a rotating axis of the foldable movable ladder for rotating and folding the movable ladder.

[0016] The utility model also discloses a crane, on which a negative angle limiting ladder capable of automatically offsetting the gap is arranged.

[0017] Beneficial effects: Compared with the prior art, the utility model has the following significant advantages:

[0018] (1) A handle-type indexing pin with a fixed position is used to fix the folded movable ladder, which is convenient to operate and uses less materials, reduces the frequency of use of the latch, saves manufacturing costs, and does not affect the climbing space in the movable ladder.

[0019] (2) Using a support structure to fix the folding part of the ladder can better ensure the stability of the ladder and ensure the safety of the operators.

[0020] (3) The supporting structure is simple in construction, low in processing cost, and easy to implement.

[0021] (4) After opening the ladder, the operator does not need to operate again, and can only rely on gravity to fix the ladder, which improves the work efficiency and prevents accidents caused by forgetting to fix the ladder. The stability of the ladder during use can be better guaranteed, the structure is simple and easy to implement, and the efficiency of getting on and off the vehicle can be improved, and accidents caused by forgetting to fix the ladder can be prevented. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Figure 1. A bolt-on ladder for a crane.

[0023] Figure 2 Illustration of a bolt-on ladder Figure 1 ; 1. Bending plate 2. Connecting chain 3. Fixing pin 4. Rotating pin 5. O-type card 6. Latch 7. Movable ladder 8. Fixed ladder.

[0024] Figure 3 Illustration of a bolt-on ladder Figure 2 ;

[0025] Figure 4 This is the force diagram of the ladder when in use;

[0026] Figure 5 This is a schematic diagram of the structure of the utility model; 1. movable ladder 2. bent plate 3. supporting structure 4. fixed ladder 5. handle-type indexing pin with fixed stop position;

[0027] Figure 6 This is the exploded view of the utility model; 1. movable ladder 2. bent plate 3. supporting structure 4. fixed ladder 5. handle-type indexing pin with fixed position 6. bolt 7. nut 8. gasket;

[0028] Figure 7 Figure 1 is a diagram of the rotating support structure; 2. bent plate 3. support structure 6. bolt 7. nut 9. support inclined plane;

[0029] Figure 8 The supporting structure principle of the movable ladder Figure 1 ;1. movable ladder 3. supporting structure;

[0030] Fig. 9 The second supporting structure principle of the movable ladder: 1. movable ladder 2. bent plate 3. supporting structure 4. fixed ladder 5. handle-type indexing pin with fixed position;

[0031] Fig.10 Folded ladder; 1. Movable ladder 2. Bent plate 3. Support structure 4. Fixed ladder 5. Handle-type indexing pin with fixed position;

[0032] Fig.11 Open a long hole for fixing the ladder;

[0033] Fig.12 It is a ladder with an anti-sway support structure; 1. movable ladder 2. bent plate 3. support structure 4. fixed ladder 5. handle-type indexing pin with a fixed position;

[0034] Fig.13 It is an exploded view; 1. movable ladder 4. fixed ladder 5. handle-type indexing pin with fixed position 6. bolt 7. nut 8. gasket 10. movable ladder gasket 11. fixed nut 12. fixed bolt 13. wedge block;

[0035] Fig.14 The supporting structure principle of the movable ladder: 1. movable ladder 3. supporting structure 4. fixed ladder;

[0036] Fig.15 It is the supporting structure principle of the movable ladder;

[0037] Fig.16 It is a folded ladder; 1. movable ladder 4. fixed ladder 5. handle-type indexing pin with fixed position. DETAILED DESCRIPTION

[0038] The technical solution of the utility model is further described below in conjunction with the accompanying drawings.

[0039] The utility model provides a crane negative angle limit ladder that is easy to operate and stable. The ladder is composed of a movable ladder, a bent plate, a support structure, a fixed ladder, and a handle-type indexing pin with a fixed stop position. The bent plate and the fixed ladder are fixed to a vehicle frame by bolt connection, and the fixed ladder has a hole, into which the handle-type indexing pin with a fixed stop position of the movable ladder can be inserted. The ladder is limited during use by a rotating support structure with an inclined limit structure, and is automatically aligned during disassembly and stacking by a handle-type indexing pin with a fixed stop position. The ladder has a simple structure, low processing cost, good stability, and is easy to operate.

[0040] like Figure 5 As shown in the figure, the ladder is composed of: a movable ladder, a bent plate, a support structure, a fixed ladder, and a handle-type indexing pin with a fixed position. The bent plate and the fixed ladder are fixed to the frame by bolts, and the fixed ladder has a hole, into which the handle-type indexing pin with a fixed position of the movable ladder can be inserted. The ladder is limited and folded when in use by rotating the support structure.

[0041] like Figure 7 As shown, the rotating support structure of the ladder is composed of: a bent plate, a support structure, nuts, and bolts. The bent plate is fixed to the frame by bolts; the support structure is designed with an inclined surface to limit the displacement of the movable ladder, and the support structure is connected to the bent plate by welding; the bent plate and the support structure each have a hole and are combined by bolts to form a rotating axis of the foldable movable ladder, which is used for the rotation and folding of the movable ladder.

[0042] like Figure 8 and Fig. 9 As shown, when the ladder is in use, the ladder directly uses its own gravity to make the ladder contact with the inclined surface of the supporting structure to form a limit position, so that the ladder can no longer shake. Figure 2-6 As shown in the figure, simply fold the ladder and insert the handle-type indexing pin with a fixed position into the hole of the fixed ladder to fix the movable ladder. Fig.11 As shown, the hole opened on the fixed ladder is a long hole, and the width of the long hole is the same as the diameter of the indexing pin. After insertion, it can prevent the movable ladder from shaking after folding. The length of the long hole is slightly larger than the diameter of the indexing pin to prevent the indexing pin from being difficult to insert due to manufacturing errors. The use of the long hole facilitates the insertion of the indexing pin without losing stability.

[0043] The utility model designs another alternative solution which can also realize a negative angle limit structure that automatically offsets the gap to prevent the ladder from shaking. The ladder is easy to operate, has strong stability, is simple to manufacture, and has relatively low cost.

[0044] like Fig.12 As shown, this ladder is composed of: a movable ladder, a bent plate, a support structure, a fixed ladder, and a handle-type indexing pin with a fixed position. The bent plate is welded to the fixed ladder, and the whole is fixed to the frame by bolts; the fixed ladder has a hole, and the handle-type indexing pin with a fixed position of the movable ladder can be inserted into it. The ladder is limited and folded when in use by rotating the support structure.

[0045] like Fig.13 As shown, the bent plate is connected to the frame and fixed thereon by bolts; the inclined surface is replaced by a wedge block, and the wedge block is assembled at the bottom of the fixed ladder by fixing bolts and fixing nuts; the function of the wedge block is to limit the displacement of the movable ladder; the supporting structure is welded to the fixed ladder, and a hole is opened and bolted to form a rotating shaft of the folding movable ladder, which is used for the rotation and folding of the movable ladder.

[0046] like Fig.14 and Fig.15 As shown, when the ladder is in use, the ladder directly uses its own gravity to make the ladder contact with the inclined surface of the wedge block to form a limit position, so that the ladder can no longer shake. Fig.16 The movable ladder can be fixed by folding the ladder directly and inserting the handle-type indexing pin with a fixed position into the hole of the fixed ladder.

Claims

1. A negative angle limit ladder that can automatically offset the gap, characterized in that: The invention comprises a movable ladder (1), a bent plate (2), a supporting structure (3), a fixed ladder (4) and a handle-type indexing pin (5) with a fixed position; the bent plate (2) and the fixed ladder (4) are fixed to a frame of a crane by bolt connection; a hole is opened on the side of the fixed ladder (4), and the handle-type indexing pin (5) with a fixed position of the movable ladder (1) can be inserted into the hole; The movable ladder (1) is connected to the bent plate (2) via a supporting structure (3), and the supporting structure (3) is rotated to achieve position limiting and folding during use.

2. A negative angle limiting ladder capable of automatically offsetting gaps according to claim 1, characterized in that: The support structure (3) is connected to the bent plate (2) by welding; the bent plate (2) and the support structure (3) are respectively provided with holes and are combined by bolts to form a rotating shaft of the folding ladder, which is used for the rotation and folding of the ladder.

3. The negative angle limiting ladder capable of automatically offsetting the gap according to claim 1, characterized in that: The opening on the side of the fixed ladder (4) is a long hole, the width of the long hole is the same as the diameter of the handle-type indexing pin (5) with a fixed position, and the length of the long hole is greater than the diameter of the handle-type indexing pin (5) with a fixed position.

4. The negative angle limiting ladder capable of automatically offsetting the gap according to claim 1, characterized in that: The supporting structure (3) is an inclined surface limiting structure.

5. The negative angle limiting ladder capable of automatically offsetting the gap according to claim 1, characterized in that: The support structure (3) is provided with a wedge block, which is assembled at the bottom of the fixed ladder (4) by means of fixing bolts and fixing nuts. The support structure (3) is welded to the fixed ladder (4), has holes and is assembled by means of bolts to form a rotating shaft of the foldable movable ladder, and is used for the rotation and folding of the movable ladder.

6. A crane, characterized in that: The crane is provided with a negative angle limiting ladder as claimed in claim 1 which can automatically offset the gap.

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