Crawling ladder for strip mine truck and strip mine truck

Abstract

The utility model relates to the technical field of strip mine trucks, and provides a strip mine truck ladder stand and a strip mine truck, the strip mine truck ladder stand comprises a fixed ladder and a swing ladder; the fixed ladder is used for being connected to a vehicle body and comprises an upper sealing plate, a fixed pedal and supporting beams, the upper sealing plate and the fixed pedal are connected between the two supporting beams respectively, the two supporting beams are oppositely arranged, and the upper sealing plate and the fixed pedal are oppositely arranged; the swing ladder comprises swing arm plates and a swing pedal, the two swing arm plates are hinged to the ends, close to the fixed pedal, of the two supporting beams respectively, and the ends, away from the fixed pedal, of the two swing arm plates are hinged to the two ends of the swing pedal respectively. The ladder stand has the beneficial effects that the fixed ladder is connected to the vehicle body, so that the stability of the ladder stand when an operator enters the vehicle body and leaves the vehicle body is ensured. The swing ladder is hinged to the fixed ladder and can swing relative to the fixed ladder along with running of the vehicle body, and the flexibility of the ladder stand is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to open pit truck technology field, specifically, an open pit truck ladder stand and open pit truck. BACKGROUND

[0002] In open pit mining operation, mine truck (mine transport truck) often carries out transportation operation in rugged and complex terrain. These environmental features include loose rock, muddy ground and constantly changing slope, which makes the mine truck face great challenges in the transportation process. The bumper ladder stand is the first channel device for the staff from the ground to the vehicle, and the anti-skid effect and safety of the ladder stand are closely related to the safety of the staff to provide a safe access channel for the staff in harsh working environment.

[0003] The existing mine truck bumper ladder stand adopts a hard connection structure as a whole, which improves the strength and stability of the ladder stand to a certain extent, but the bottom structure of the ladder stand lacks buffering capacity, resulting in frequent collision deformation and damage of the bottom of the ladder stand in the rugged and complex running environment of the mine truck. In addition, the collision and deformation of the bottom of the ladder stand not only affect the normal use of the mine truck, but also may bring safety hazards to the operator and increase the potential risk of accidents. SUMMARY

[0004] The problem solved by the utility model is how to improve the service life and safety of the mine truck ladder stand.

[0005] To solve the above problems, the utility model provides an open pit truck ladder stand and an open pit truck.

[0006] In the first aspect, the utility model provides an open pit truck ladder stand, which comprises a fixed ladder and a swing ladder.

[0007] The fixed ladder is used to be connected to the vehicle body, and the fixed ladder comprises an upper sealing plate, a fixed step and a support beam, the upper sealing plate and the fixed step are connected between two support beams respectively, wherein the two support beams are oppositely arranged, and the upper sealing plate and the fixed step are oppositely arranged.

[0008] The swing ladder comprises a swing arm plate and a swing step, two swing arm plates are hinged to one end of two support beams close to the fixed step respectively, and the other end of two swing arm plates away from the fixed step is hinged to two ends of the swing step respectively.

[0009] Optionally, one end of the swing arm plate close to the support beam is provided with a first sleeve, one end of the support beam close to the swing arm plate is provided with a second sleeve, and the first sleeve and the second sleeve are used to be hinged through a pin shaft.

[0010] Optionally, the swing ladder further comprises side arm plates, and two side arm plates are respectively connected to the two ends of the swing pedal;

[0011] A third sleeve is respectively provided on the two side arm plates, and a fourth sleeve is provided on one end of the swing arm plate away from the support beam, and the third sleeve and the fourth sleeve are used for hinged connection through a pin shaft.

[0012] Optionally, the swing pedal includes a first square tube and a first serrated steel plate, the two ends of the first square tube are respectively connected between the two side arm plates, and the first serrated steel plate is arranged on the end surface of the first square tube facing the fixed pedal.

[0013] Optionally, the fixed pedal includes a second square tube and a second serrated steel plate, both ends of the second square tube are respectively connected between the two support beams, and the second serrated steel plate is arranged on the end surface of the second square tube facing the upper sealing plate.

[0014] Optionally, the upper cover plate is in an L-shaped structure, comprising a first plate and a second plate connected to each other, the first plate and the fixed pedal are arranged parallel to each other, and the second plate is used to abut against the vehicle body.

[0015] Optionally, the open-pit mine truck ladder further includes handrails and guardrails, and the two guardrails are used to be spaced apart on the vehicle body, one end of the two handrails are respectively connected to the two guardrails, and the other end of the two handrails are respectively connected to the two support beams.

[0016] Optionally, the open-pit mine ladder further comprises a clamp structure, wherein the clamp structure comprises a first clamp, a second clamp and a rubber member;

[0017] The first clamp comprises a first semi-cylinder portion, a first clamping portion and a first connecting portion, wherein the first semi-cylinder portion is located between the first clamping portion and the first connecting portion;

[0018] The second clamp comprises a second semi-cylinder portion, a second clamping portion and a second connecting portion, wherein the second semi-cylinder portion is located between the second clamping portion and the second connecting portion;

[0019] The first clamping portion is provided with a clamping slot, and the second clamping portion is clamped with the first clamping portion through the clamping slot; the first connecting portion and the second connecting portion are respectively connected to the armrest;

[0020] The first half-cylinder portion and the second half-cylinder portion are used to cooperate with each other to embrace the guardrail;

[0021] The two rubber pieces are respectively sleeved on two ends of the first semi-cylinder portion and the second semi-cylinder portion.

[0022] Optionally, the rubber piece is in a ring shape, and a notch is formed in the ring shape.

[0023] In a second aspect, the utility model provides a surface mine truck, including car body and the surface mine truck ladder of above.

[0024] The surface mine truck ladder has the advantages that: in use, the fixed ladder is connected to the car body to ensure the stability of the ladder when the operator enters or leaves the car body. The fixed ladder includes an upper cover plate, support beams and a fixed step. The upper cover plate, the two support beams and the fixed step form a rectangular structure. The two support beams provide support force for the upper cover plate and the fixed step to ensure the stability of the fixed ladder. The upper cover plate is connected to the car body to prevent the fixed ladder from sliding or falling off the car body, thereby improving the safety of the ladder. The operator can step on the fixed step to enter or leave the mine truck. The swing ladder is hinged to the fixed ladder and can swing relative to the fixed ladder when the car body moves, effectively improving the flexibility of the ladder and preventing the bottom of the ladder from colliding with ground obstacles such as rocks, thereby increasing the service life and safety of the ladder. The swing ladder includes swing arm plates and a swing step. The two swing arm plates are hinged to the ends of the two support beams near the fixed step, and the ends of the two swing arm plates away from the fixed step are hinged to the ends of the swing step, so that the swing arm plates drive the swing step to swing relative to the fixed ladder, thereby improving the flexibility of the mine truck ladder. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 FIG. 1 is a structural schematic diagram of the surface mine truck ladder according to the utility model embodiment;

[0026] Figure 2 FIG. 2 is a structural schematic diagram of the fixed ladder according to the utility model embodiment;

[0027] Figure 3 FIG. 3 is a structural schematic diagram of the swing arm plate according to the utility model embodiment;

[0028] Figure 4 FIG. 4 is a structural schematic diagram of the swing step and the side arm plate according to the utility model embodiment;

[0029] Figure 5 FIG. 5 is a structural schematic diagram of the clamp structure according to the utility model embodiment; Figure 1

[0030] Figure 6 FIG. 6 is a structural schematic diagram of the clamp structure according to the utility model embodiment. Figure 2

[0031] MARKING OF THE DRAWINGS:

[0032] 1 - upper cover plate; 1.1 - first plate; 1.2 - second plate; ​​

[0033] 2 - fixed pedal; 2.1 - second square tube; 2.2 - second zigzag steel plate;

[0034] 3 - support beam; 3.1 - second sleeve;

[0035] 4 - swing arm plate; 4.1 - first sleeve; 4.2 - fourth sleeve;

[0036] 5 - swing pedal; 5.1 - first square tube; 5.2 - first zigzag steel plate;

[0037] 6 - side arm plate; 6.1 - third sleeve;

[0038] 7 - handrail; 8 - guardrail;

[0039] 9 - first clamp; 9.1 - first half-cylinder part, 9.2 - first clamping part; 9.21 - clamping groove; 9.3 - first connecting part;

[0040] 10 - second clamp; 10.1 - second half-cylinder part; 10.2 - second clamping part; 10.3 - second connecting part; 11 - rubber piece. DETAILED DESCRIPTION

[0041] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings. Although some embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms, and should not be interpreted as being limited to the embodiments described herein, on the contrary, these embodiments are provided to make the present application more thorough and complete. It should be understood that the drawings and embodiments of the present application are only for illustrative purposes, and are not used to limit the protection scope of the present application.

[0042] The term "comprising" and its variants used herein are open-ended, i.e. "including but not limited to"; the term "based on" is "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiment". Related definitions of other terms will be given in the following description. It should be noted that the "first", "second", etc. concepts mentioned in the present application are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0043] It should be noted that the modification of "one" and "multiple" in the utility model is illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise explicitly indicated in the context, it should be understood as "one or more".

[0044] In view of the problems in the above related technologies, such as Figures 1 to 6 As shown in the utility model embodiment, the utility model provides a kind of open pit truck ladder, including fixed ladder and swing ladder.

[0045] The fixed ladder is used to be connected on the vehicle body, and the fixed ladder includes an upper sealing plate 1, a fixed step 2 and a support beam 3, and the upper sealing plate 1 and the fixed step 2 are connected between two support beams 3 respectively, wherein the two support beams 3 are oppositely arranged, and the upper sealing plate 1 and the fixed step 2 are oppositely arranged.

[0046] Specifically, the fixed ladder is used to be connected on the vehicle body to ensure the stability of the connection between the ladder and the vehicle body. Figure 2 As shown in the utility model embodiment, the fixed ladder includes an upper sealing plate 1, a fixed step 2 and two support beams 3, and the upper sealing plate 1, the fixed step 2 and the two support beams 3 are connected to form a rectangular structure, wherein the upper sealing plate 1 and the fixed step 2 are connected between the two support beams 3, the two support beams 3 are oppositely arranged, and the upper sealing plate 1 and the fixed step 2 are oppositely arranged to form a rectangular structure. The upper sealing plate 1 is made of anti-skid flat bean pattern steel plate and has certain anti-skid ability. When installing, the upper sealing plate 1 is connected with the vehicle body, and the staff can enter the truck by stepping on the fixed step 2, and can also step on the upper sealing plate 1 for leverage when necessary.

[0047] The swing ladder includes a swing arm plate 4 and a swing step 5, and two swing arm plates 4 are hingedly connected with two support beams 3 near one end of the fixed step 2 respectively, and one end of the two swing arm plates 4 away from the fixed step 2 is hingedly connected with two ends of the swing step 5 respectively.

[0048] Specifically, the swing ladder is used to be hingedly connected on the fixed ladder, and the swing ladder includes a swing arm plate 4 and a swing step 5, the swing arm plate 4 is used to connect the swing step 5 with the fixed ladder, and the swing arm plate 4 is hingedly connected with the fixed ladder, so that the swing arm plate 4 can drive the swing step 5 to swing relative to the fixed ladder when the vehicle body runs. Figure 1 As shown in the utility model embodiment, the two swing arm plates 4 are spaced apart at two ends of the swing step 5, and one end of the two swing arm plates 4 is hingedly connected with two ends of the swing step 5, so that the swing arm plate 4 can drive the swing step 5 to swing. The other end of the two swing arm plates 4 is hingedly connected with one end of the support beam 3 of the fixed ladder near the fixed step 2, so that the swing arm plate 4 can drive the swing step 5 to swing relative to the fixed ladder, realizing the free swing of the swing ladder.

[0049] In the embodiment, the fixed ladder is connected to the vehicle body when in use, ensuring the stability of the ladder when the operator enters or leaves the vehicle body. The fixed ladder comprises an upper cover plate 1, a support beam 2 and a fixed step 3, and the upper cover plate 1, the two support beams 2 and the fixed step 3 form a rectangular structure. The two support beams 2 provide support force for the upper cover plate 1 and the fixed step 3 to ensure the stability of the fixed ladder. The upper cover plate 1 is connected to the vehicle body to prevent the fixed ladder from sliding or falling off the vehicle body, thereby improving the safety of the ladder. The operator can step on the fixed step 3 to enter or leave the mine car. The swing ladder is hinged to the fixed ladder and can swing relative to the fixed ladder when the vehicle body moves, effectively improving the flexibility of the ladder and avoiding violent collision between the bottom of the ladder and ground obstacles such as rocks, thereby increasing the service life and safety of the ladder. The swing ladder comprises swing arm plates 4 and a swing step 5. The two swing arm plates 4 are respectively hinged to one end of the two support beams 3 near the fixed step 2, and the other end of the two swing arm plates 4 is respectively hinged to the two ends of the swing step 5, so that the swing arm plates 4 drive the swing step 5 to swing relative to the fixed ladder, thereby improving the flexibility of the ladder.

[0050] Optionally, the end of the swing arm plate 4 near the support beam 3 is provided with a first sleeve 4.1, and the end of the support beam 3 near the swing arm plate 4 is provided with a second sleeve 3.1. The first sleeve 4.1 and the second sleeve 3.1 are used for hinging through a pin shaft.

[0051] Specifically, as shown in Figure 2 and Figure 3 , the end of the swing arm plate 4 near the support beam 3 is provided with a first sleeve 4.1, and the end of the support beam 3 near the swing arm plate 4 is provided with a second sleeve 3.1. The first sleeve 4.1 and the second sleeve 3.1 are coaxially arranged, and a pin shaft is sequentially inserted through the first sleeve 4.1 and the second sleeve 3.1 to realize the hinging of the support beam 3 and the swing arm plate 4. It should be noted that the number of the second sleeve 3.1 and the first sleeve 4.1 can be determined according to the actual situation of the support beam 3 and the swing arm plate 4, such as Figure 3 , the first sleeve 4.1 is arranged at intervals to form two, and the second sleeve 3.1 is arranged as one. In order to avoid shaking after installation, the length of the second sleeve 3.1 is equal to the interval of the first sleeve 4.1. During installation, the second sleeve 3.1 is arranged between the first sleeve 4.1, and the second sleeve 3.1 and the first sleeve 4.1 are coaxially arranged and hinged through a pin shaft.

[0052] Optionally, the swing ladder further comprises side arm plates 6, and the two side arm plates 6 are respectively connected to the two ends of the swing step 5.

[0053] Two third sleeves 6.1 are arranged on the two side arm plates 6 respectively, and a fourth sleeve 4.2 is arranged on the end of the swing arm plate 4 away from the support beam 3, and the third sleeve 6.1 and the fourth sleeve 4.2 are used for being hinged through a pin shaft.

[0054] Specifically, as shown in Figure 4 two side arm plates 6 are arranged at the two ends of the swing step 5 respectively, and the third sleeve 6.1 is arranged at the end of the side arm plate 6 towards the fixed ladder, and the fourth sleeve 4.2 is arranged at the end of the swing arm plate 4 away from the support beam 3, the third sleeve 6.1 and the fourth sleeve 4.2 are coaxially arranged, and the pin shaft is sequentially arranged through the third sleeve 6.1 and the fourth sleeve 4.2 to realize the hinge connection of the side arm plate 6 and the swing arm plate 4. It should be noted that the number of the third sleeve 6.1 and the fourth sleeve 4.2 can be determined according to the actual situation of the side arm plate 6 and the swing arm plate 4, for example, Figure 4 two third sleeves 6.1 are arranged at intervals, and one fourth sleeve 4.2 is arranged, and in order to avoid shaking after installation, the length of the fourth sleeve 4.2 is equal to the interval of the third sleeve 6.1, and during installation, the fourth sleeve 4.2 is arranged between the third sleeve 6.1, and the fourth sleeve 4.2 is coaxially arranged with the third sleeve 6.1 and is hinged through the pin shaft.

[0055] In addition, in order to reduce the collision of the swing ladder with the ground obstacles, a protective cover such as a rubber protective cover is arranged on the end of the side arm plate 6 away from the fixed ladder, that is, the end towards the bottom surface.

[0056] Optionally, the swing step 5 comprises a first square tube 5.1 and a first sawtooth steel plate 5.2, the two ends of the first square tube 5.1 are connected between the two side arm plates 6 respectively, and the first sawtooth steel plate 5.2 is arranged on the end surface of the first square tube 5.1 towards the fixed step 2.

[0057] Specifically, the conventional ladder step plate often adopts flat bean pattern steel anti-skid material or step punching anti-skid measures, but the anti-skid effect of the above-mentioned materials will be greatly reduced in the extremely cold and muddy harsh environment of the mining area, in order to improve the anti-skid property of the step plate, as shown in Figure 4 the swing step 5 of the embodiment comprises a first square tube 5.1 and a first sawtooth steel plate 5.2, the first square tube 5.1 is a hollow steel tube, which reduces the weight of the swing step 5 while ensuring the hardness, and the first square tube 5.1 is welded between the side arm plates 6 to provide support for the swing step 5. The first sawtooth steel plate 5.2 is a mesh structure steel plate structure, the length of the first sawtooth steel plate 5.2 is equal to the length of the fixed step 2, the width of the first sawtooth steel plate 5.2 is equal to the width of the side arm plate 6, and the end surface of the first sawtooth steel plate 5.2 towards the fixed step 2 is provided with a sawtooth structure to increase the friction between the shoe surface of the operator and the swing step 5 and increase the safety of using the ladder.

[0058] Optionally, the fixed pedal 2 includes a second square tube 2.1 and a second serrated steel plate 2.2, the two ends of the second square tube 2.1 are respectively connected between the two support beams 3, and the second serrated steel plate 2.2 is arranged on the end surface of the second square tube 2.1 facing the upper cover plate 1.

[0059] Specifically, if Figure 2 As shown, the fixed pedal 2 includes a second square tube 2.1 and a second serrated steel plate 2.2. The second square tube 2.1 is a hollow steel tube that reduces the weight of the fixed pedal 2 while ensuring rigidity. The second square tube 2.1 is welded between the support beams 3 to provide support for the fixed pedal 2. The second serrated steel plate 2.2 is a mesh-like steel plate structure with a width equal to that of the support beams 3. The end surface of the second serrated steel plate 2.2 facing the upper cover plate 1 is provided with a serrated structure to increase friction between the operator's shoe and the fixed pedal 2, thereby improving the safety of ladder climbing.

[0060] Optionally, the upper cover plate 1 is L-shaped, comprising a first plate 1.1 and a second plate 1.2 connected to each other, wherein the first plate 1.1 and the fixed pedal 2 are arranged parallel to each other, and the second plate 1.2 is used to abut against the vehicle body.

[0061] Specifically, if Figure 2 As shown, the upper cover plate 1 is L-shaped, wherein the first plate 1.1 is arranged parallel to the fixed step 2 and can also be used as a step when needed. The second plate 1.2 abuts against the vehicle body to reduce friction between the vehicle body and the fixed ladder and increase the stability of the connection between the vehicle body and the fixed ladder.

[0062] Optionally, the open-pit mine truck ladder further includes a handrail 7 and a guardrail 8, wherein the two guardrails 8 are arranged at intervals on the vehicle body, one end of the two handrails 7 is respectively connected to the two guardrails 8, and the other end of the two handrails 7 is respectively connected to the two support beams 3.

[0063] Specifically, if Figure 1 As shown, the open-pit mining truck ladder of this embodiment also includes handrails 7 and guardrails 8. The bottoms of the two guardrails 8 may have connection holes, which can be removably connected to the vehicle body at intervals to provide assistance to the operator when getting on and off the vehicle body. There are two handrails 7, and the ends of the two handrails 7 are respectively connected to the two guardrails 8 and the support beam 3. For example, connection holes are provided at both ends of the handrails, and the handrails can be removably attached to the guardrails 8 and the support beam 3 by bolt connection. This can provide assistance to the operator's movements on the ladder, prevent the operator from falling off the ladder, and ensure the safety of the ladder.

[0064] Optionally, the open-pit mine ladder further comprises a clamp structure, and the clamp structure comprises a first clamp 9, a second clamp 10 and a rubber member 11;

[0065] The first clamp 9 comprises a first half-cylinder portion 9.1, a first clamping portion 9.2 and a first connecting portion 9.3, the first half-cylinder portion 9.1 being located between the first clamping portion 9.2 and the first connecting portion 9.3;

[0066] The second clamp 10 comprises a second half-cylinder portion 10.1, a second clamping portion 10.2 and a second connecting portion 10.3, the second half-cylinder portion 10.1 being located between the second clamping portion 10.2 and the second connecting portion 10.3;

[0067] The first clamping portion 9.2 is provided with a clamping groove 9.21, and the second clamping portion 10.2 is clamped with the first clamping portion 9.2 through the clamping groove 9.21; the first connecting portion 9.3 and the second connecting portion 10.3 are connected with the handrail 7 respectively;

[0068] The first half-cylinder portion 9.1 and the second half-cylinder portion 10.1 are used to hold the guardrail 8;

[0069] Two rubber pieces 11 are respectively sleeved on both ends of the first half-cylinder portion 9.1 and the second half-cylinder portion 10.1.

[0070] Specifically, the conventional mine truck bumper ladder handrail often adopts hard connection, such as metal material, and adopts bolt fastening. However, such hard connection handrail will vibrate with the movement of the mine truck during the operation of the mine truck, and the hard connection part will be fatigue fractured under the long-time action, causing the handrail 7 to fall off, thereby, as shown in Figure 5 and Figure 6 The clamp structure provided by the embodiment is used for connecting the handrail 7 and the guardrail 8. The clamp structure comprises a first clamp 9 and a second clamp 10, the first clamp 9 and the second clamp 10 are used in cooperation to clamp the guardrail 8 and connect the handrail 7, and rubber pieces 11 are respectively sleeved on the upper ends of the first clamp 9 and the second clamp 10 and the lower ends of the first clamp 9 and the second clamp 10, so as to provide a certain buffer for the first clamp 9 and the second clamp 10 and the guardrail 8 when vibration occurs, thereby reducing the vibration.

[0071] Specifically, the first clamp 9 comprises a first half-cylinder part 9.1, a first clamping part 9.2 and a first connecting part 9.3, the first clamping part 9.2 and the first connecting part 9.3 are arranged at two ends, the first half-cylinder part 9.1 is arranged between the first clamping part 9.2 and the first connecting part 9.3, the second clamp 10 comprises a second half-cylinder part 10.1, a second clamping part 10.2 and a second connecting part 10.3, the second clamping part 10.2 and the second connecting part 10.3 are arranged at two ends, the second half-cylinder part 10.1 is arranged between the second clamping part 10.2 and the second connecting part 10.3, and the horizontal projection of the first half-cylinder part 9.1 and the second half-cylinder part 10.1 is semicircular, the diameter of the semicircle is slightly larger than the diameter of the guardrail 8, so that the first half-cylinder part 9.1 and the second half-cylinder part 10.1 can be sleeved on the guardrail 8, and the two ends of the first half-cylinder part 9.1 and the second half-cylinder part 10.1 abut. The width of the first clamping part 9.2 is greater than the width of the second clamping part 10.2, and a clamping groove 9.21 is arranged at the central part of the first clamping part 9.2, the length of the clamping groove 9.21 is slightly greater than the width of the second clamping part 10.2, so that the second clamping part 10.2 can be inserted into the clamping groove 9.21, that is, the second clamping part 10.2 is clamped with the first clamping part 9.2 through the clamping groove 9.21. It should be noted that, in order to avoid the second clamping part 10.2 from shaking in the clamping groove 9.21, a rubber sleeve can be sleeved in the clamping groove 9.21, and the length of the clamping groove 9.21 after sleeving the rubber sleeve can be slightly smaller than the width of the second clamping part 10.2, so that the second clamping part 10.2 is tightly fixed in the clamping groove. When the first clamp 9 and the second clamp 10 are connected, the first connecting part 9.3 and the second connecting part 10.3 are tightly fitted, and the first connecting part 9.3 and the second connecting part 10.3 are correspondingly provided with connecting holes, the connecting holes arranged on one end of the handrail 7 close to the guardrail 8 are coaxially arranged with the connecting holes correspondingly arranged on the first connecting part 9.3 and the second connecting part 10.3, and are connected and fastened by, for example, bolts, so as to connect the handrail 7 on the guardrail through the first clamp 9 and the second clamp 10.

[0072] Optionally, the rubber piece 11 is in a ring structure, and a notch is arranged on the ring structure.

[0073] Specifically, as shown in the drawings, Figure 6 the rubber piece 11 is made of rubber material and is in a ring structure, and a notch is arranged on the ring structure along the central axis, so that the rubber piece 11 can be separated along the notch and sleeved in the corresponding position during installation, thereby increasing the installation convenience.

[0074] The open-pit mine truck provided by the embodiment of the utility model has the same beneficial effects as the open-pit mine climbing ladder of the prior art, and details are not repeated here.

[0075] The open-pit mine truck of the embodiment has the same beneficial effects as the open-pit mine climbing ladder of the prior art, and details are not repeated here.

[0076] Although the utility model discloses as above, the protection scope of the utility model is not limited to this only.The person skilled in the art can make various changes and modifications without departing from the spirit and scope of the utility model, and these changes and modifications will all fall into the protection scope of the utility model.

Claims

1. A mobile cat ladder for an open pit mine, characterised in that, The fixed ladder and the swing ladder are included; The fixed ladder is connected to the vehicle body, and includes an upper cover plate (1), fixed steps (2) and support beams (3). The upper cover plate (1) and the fixed steps (2) are connected to the two support beams (3) respectively, wherein the two support beams (3) are oppositely arranged, and the upper cover plate (1) and the fixed steps (2) are oppositely arranged. The swing ladder includes swing arm plates (4) and a swing step (5). The two swing arm plates (4) are hingedly connected to the two support beams (3) near one end of the fixed steps (2), and the two ends of the swing step (5) are hingedly connected to the two swing arm plates (4) away from the fixed steps (2) respectively.

2. The strip ladder for a surface mine truck according to claim 1, characterized in that The swing arm plate (4) is provided with a first sleeve (4.1) near one end of the support beam (3), and the support beam (3) is provided with a second sleeve (3.1) near one end of the swing arm plate (4). The first sleeve (4.1) and the second sleeve (3.1) are hingedly connected by a pin shaft.

3. The strip ladder according to claim 1 or 2, characterized in that The swing ladder further includes side arm plates (6), and the two side arm plates (6) are connected to the two ends of the swing step (5) respectively. The two side arm plates (6) are respectively provided with third sleeves (6.1), and the swing arm plate (4) is provided with a fourth sleeve (4.2) away from the support beam (3). The third sleeve (6.1) and the fourth sleeve (4.2) are hingedly connected by a pin shaft.

4. The strip ladder for a surface mine truck according to claim 3, characterized in that The swing step (5) includes a first square tube (5.1) and a first sawtooth steel plate (5.2). The two ends of the first square tube (5.1) are connected to the two side arm plates (6) respectively, and the first sawtooth steel plate (5.2) is arranged on the end face of the first square tube (5.1) facing the fixed steps (2).

5. The surface mine cat ladder of claim 1, wherein, The fixed steps (2) include a second square tube (2.1) and a second sawtooth steel plate (2.2). The two ends of the second square tube (2.1) are connected to the two support beams (3) respectively, and the second sawtooth steel plate (2.2) is arranged on the end face of the second square tube (2.1) facing the upper cover plate (1).

6. The surface mine cat ladder of claim 1, wherein, The upper cover plate (1) has an L-shaped structure, which includes a first plate (1.1) and a second plate (1.2) connected to each other. The first plate (1.1) is arranged in parallel with the fixed steps (2), and the second plate (1.2) is arranged in abutment with the vehicle body.

7. The surface mine cat ladder of claim 1, wherein, The handrails (7) and the guardrails (8) are further included. The two guardrails (8) are arranged at intervals on the vehicle body, and one end of each of the two handrails (7) is connected to one of the two guardrails (8), and the other end of each of the two handrails (7) is connected to one of the two support beams (3).

8. The strip ladder according to claim 7, characterised in that The clamp structure further includes a first clamp (9), a second clamp (10) and a rubber piece (11). The first clamp (9) includes a first half-cylinder part (9.1), a first clamping part (9.2) and a first connecting part (9.3). The first half-cylinder part (9.1) is located between the first clamping part (9.2) and the first connecting part (9.3). The second clamping hoop (10) comprises a second half-cylinder part (10.1), a second clamping part (10.2) and a second connecting part (10.3), and the second half-cylinder part (10.1) is located between the second clamping part (10.2) and the second connecting part (10.3); A clamping groove (9.21) is formed on the first clamping part (9.2), and the second clamping part (10.2) is clamped with the first clamping part (9.2) through the clamping groove (9.21); the first connecting part (9.3) and the second connecting part (10.3) are connected with the handrail (7) respectively; The first half-cylinder part (9.1) and the second half-cylinder part (10.1) are used for cooperating to hold the guardrail (8); Two rubber parts (11) are respectively sleeved on two ends of the first half-cylinder part (9.1) and the second half-cylinder part (10.1).

9. The strip ladder according to claim 8, characterised in that The rubber part (11) is in a ring structure, and a notch is formed on the ring structure.

10. A truck for use in an open pit mine, characterized in that An open mine climbing ladder comprising a vehicle body and the open mine climbing ladder according to any one of claims 1 to 9.

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