Crawling ladder device for engineering vehicle with lifting supporting legs

Abstract

A ladder stand device for an engineering vehicle with lifting supporting legs comprises an upper ladder assembly (1) installed on a frame of the engineering vehicle, a crank arm ladder assembly (2) used as a lower pedaling body and a tension connecting rod component arranged between the crank arm ladder assembly (2) and the upper ladder assembly (1), split ladder stand arrangement is achieved through the upper ladder assembly (1) and the crank arm ladder assembly (2), and the upper ladder assembly (1) and the crank arm ladder assembly (2) are connected through the tension connecting rod component. Lifting motion connection of the crank arm ladder assembly (2) is achieved, the lower end body of the ladder assembly installed on the frame of the engineering vehicle is in a height position adjustable state, and the technical problem that the lower end of the whole ladder assembly is close to the ground due to the fact that the whole ladder assembly is installed on the frame of the engineering vehicle is solved. Therefore, the passing performance of the engineering vehicle with the lifting supporting legs is improved.

Description

Technical Field

[0001] The utility model relates to a ladder climbing device, in particular to a ladder climbing device used for an engineering vehicle with lifting legs. Background Art

[0002] Engineering vehicles with lifting legs, such as aerial work vehicles, tow trucks and cranes, need operators to climb up to the aerial work platform via a ladder when performing aerial work. Therefore, a ladder device for an engineering vehicle with lifting legs is an important engineering vehicle component. In the existing ladder devices for engineering vehicles with lifting legs, an integral ladder frame is installed on the frame of the engineering vehicle. In order to facilitate the climbing of the operators, the integral ladder frame is installed at a relatively low position on the frame of the engineering vehicle, so that the lower end of the integral ladder frame is relatively close to the ground, thereby affecting the passing performance of the engineering vehicle with lifting legs.

[0003] The utility model has the technical feature of enabling the lower end of the ladder frame installed on the frame of the engineering vehicle to be in an adjustable height state, thereby effectively exploring and studying the technical problem of using an integral ladder frame installed on the frame of the engineering vehicle and making the lower end of the integral ladder frame relatively close to the ground. Summary of the invention

[0004] The object of the utility model is a ladder climbing device used for an engineering vehicle with lifting legs.

[0005] In order to overcome the above technical shortcomings, the purpose of the utility model is to provide a ladder climbing device for an engineering vehicle with lifting legs, thereby improving the passability of the engineering vehicle with lifting legs.

[0006] To achieve the above object, the technical solution adopted by the utility model is: it includes an upper ladder frame installed on the frame of an engineering vehicle, a crank arm ladder frame used as a lower pedal body, and a tension link component arranged between the crank arm ladder frame and the upper ladder frame.

[0007] Due to the design of the upper ladder frame, the crank arm ladder frame and the tension link component, a split ladder setting is realized through the upper ladder frame and the crank arm ladder frame, and the lifting and lowering movement connection of the crank arm ladder frame is realized through the tension link component, so that the lower end of the ladder frame installed on the frame of the engineering vehicle is in a state of adjustable height position, which solves the technical problem of using an integral ladder frame installed on the frame of the engineering vehicle so that the lower end of the integral ladder frame is relatively close to the ground, thereby improving the passability of the engineering vehicle with lifting legs.

[0008] The utility model is designed to connect an upper ladder frame, a crank arm ladder frame and a tension link component to each other in a manner that the lower end body of the ladder frame installed on the frame of an engineering vehicle is in a state in which the height position can be adjusted.

[0009] The utility model is designed to connect the tension link component with the upper ladder frame and the crank arm ladder frame in a lifting motion connection mode.

[0010] The utility model is designed that the tension link component is arranged to include a rocker ladder frame, a pull rod ladder frame and a tension spring.

[0011] The technical effects of the above four technical solutions are: highlighting the technical feature of making the lower end body of the ladder frame installed on the frame of the engineering vehicle in an adjustable height state, and introducing the application in the technical field of ladder climbing devices for engineering vehicles with lifting legs.

[0012] The utility model is designed to further include a first accessory device, and the first accessory device is arranged between the tension link component and the upper ladder frame, and the first accessory device is arranged as a connecting seat.

[0013] The technical effect of the above technical solution is that the integrated installation of other components is realized, thereby expanding the technical effect of the utility model.

[0014] The utility model is designed that a connecting seat is arranged on the upper ladder frame, a rocker ladder frame and a pull rod ladder frame are respectively arranged on the connecting seat, a tension spring is arranged between the rocker ladder frame and the connecting seat, and a crank ladder frame is arranged between the rocker ladder frame and the pull rod ladder frame.

[0015] The technical effect of the above technical scheme is that the upper ladder frame, the crank arm ladder frame, the rocker arm ladder frame, the pull rod ladder frame, the connecting seat and the tension spring constitute the basic technical scheme of the utility model and solve the technical problem of the utility model.

[0016] The utility model is designed that an upper ladder frame is arranged to include a plate portion and a ladder rod portion I, and the ends of the ladder rod portion I are respectively arranged to be connected to the inner side surface of the plate portion, the lower end surface portion of the ladder rod portion I located at the lower position of the plate portion and the lower portion of the inner side surface of the plate portion are respectively arranged to be connected to a connecting seat, and the inner end surface portion of the plate portion is arranged to be connected to a frame of an engineering vehicle, the plate portion is arranged to be a trapezoidal sheet-shaped body, and the ladder rod portion I is arranged to be a rectangular rod-shaped body, and the ladder rod portion I is arranged to be spaced and distributed along the vertical center line of the plate portion.

[0017] The technical effect of the above technical solution is that the vertical climbing pole ladder frame is realized.

[0018] The utility model is designed that a crank arm ladder frame is arranged to include a crank arm portion and a ladder rod portion IV, and the ends of the ladder rod portion IV are respectively arranged to be connected to the inner side surfaces of the horizontal portion of the crank arm ladder frame, the vertical end of the crank arm portion is arranged to be connected to the rocker arm ladder frame through a pin shaft, and the middle corner portion of the crank arm portion is arranged to be connected to the pull rod ladder frame through a pin shaft, the crank arm portion is arranged to be an L-shaped strip sheet body, and the ladder rod portion IV is arranged to be a rectangular rod body, and the ladder rod portion IV is arranged to be arranged and distributed at intervals along the horizontal center line of the crank arm portion.

[0019] The technical effect of the above technical solution is that the horizontal support rod ladder frame is set up.

[0020] The utility model is designed that a pull rod ladder frame is arranged to include a rod portion and a ladder rod portion II, and the ends of the ladder rod portion II are respectively arranged to be connected to the lower portion of the inner side surface of the rod portion, the upper end of the rod portion is arranged to be connected to a connecting seat through a pin shaft, and the lower end of the rod portion is arranged to be connected to the crank arm ladder frame through a pin shaft, the rod portion is arranged to be a strip-shaped sheet body, and the ladder rod portion II is arranged to be a rectangular rod-shaped body.

[0021] The utility model is designed that a rocker ladder frame is arranged to include a rocker arm portion, a ladder rod portion III and a spring seat portion II, and the ends of the ladder rod portion III are respectively arranged to be connected to the lower portion of the inner side surface of the rocker arm portion, the outer portion of the upper end surface of the ladder rod portion III is arranged to be connected to the lower end surface portion of the spring seat portion II, and the spring seat portion II is arranged to be connected to the tension spring, the upper end head of the rocker arm portion is arranged to be connected to the connecting seat through a pin shaft, and the lower end head of the rocker arm portion is arranged to be connected to the crank arm ladder frame through a pin shaft, the rocker arm portion is arranged to be a strip-shaped sheet body, and the ladder rod portion II is arranged to be a rectangular rod-shaped body, the spring seat portion II is arranged to be a block body with a through-hole body, and the through-hole body of the spring seat portion II is arranged to be connected to the tension spring.

[0022] The technical effects of the above two technical solutions are: realizing the intermediate support body of the tripod composed of the connecting seat and the crank arm ladder frame, and improving the stability performance of the crank arm ladder frame.

[0023] The utility model is designed that the extension spring is arranged as a column spring, one end of the extension spring is arranged to be connected with the rocker ladder frame in a hanging manner, and the other end of the extension spring is arranged to be connected with the connecting seat in a hanging manner.

[0024] The technical effect of the above technical solution is that the spring body is pulled and fixed.

[0025] The utility model is designed that a connecting seat is arranged to include a seat portion and a spring seat portion I, and the middle of the outer end face of the horizontal portion of the seat portion is arranged to be connected to the lower end face portion of the longitudinal portion of the spring seat portion I, the outer end face of the horizontal portion of the seat portion and the inner side face of the horizontal portion of the seat portion are respectively arranged to be connected to the upper ladder frame, and the spring seat portion I is arranged to be connected to the tension spring, the outer end head of the vertical portion of the seat portion is arranged to be connected to the pull rod ladder frame through a pin shaft, and the inner end head of the vertical portion of the seat portion is arranged to be connected to the rocker ladder frame through a pin shaft, the seat portion is arranged to be an L-shaped sheet pile body, and the spring seat portion I is arranged to be an L-shaped strip body with a through-hole body in the vertical portion, and the through-hole body of the spring seat portion I is arranged to be connected to the tension spring.

[0026] The technical effect of the above technical solution is: achieving an integrated connection of the beam body.

[0027] The utility model is designed that an upper ladder frame, a crank arm ladder frame, a rocker arm ladder frame, a pull rod ladder frame and a tension spring are arranged to be distributed in the manner of a lower contraction pedal body, and the upper ladder frame, the crank arm ladder frame, the rocker arm ladder frame, the pull rod ladder frame and the tension spring and a connecting seat are arranged to be distributed in the manner of an upper connecting body.

[0028] The utility model is designed in which the center lines of the upper ladder frame, the center lines of the crank arm ladder frame, the center lines of the rocker arm ladder frame and the center lines of the pull rod ladder frame are arranged on the same straight line, a connecting seat and a tension spring are arranged to form a group of side connecting parts, the two groups of side connecting parts are respectively arranged between the rocker arm ladder frame and the pull rod ladder frame and the upper ladder frame, the rod portion and the rocker arm portion are respectively arranged to be connected to the crank arm portion and the seat portion, and the ladder rod portion I and the plate portion located at the lower position of the plate portion are respectively arranged to be connected to the seat portion.

[0029] In the present technical scheme, the upper ladder frame and the crank arm ladder frame are basic components and are also necessary technical features of the present utility model; the rocker arm ladder frame, the pull rod ladder frame, the connecting seat and the tension spring are functional components and are features for realizing other technical effects of the present utility model; the designs of the plate part, ladder rod part I, the seat part, the spring seat part I, the rod part, the ladder rod part II, the rocker arm part, the ladder rod part III, the spring seat part II, the crank arm part and the ladder rod part IV are technical features that comply with the Patent Law and its implementing rules.

[0030] In the technical solution, the lower end body of the ladder frame installed on the frame of the engineering vehicle is placed in a state where the height position can be adjusted by the tension link component.

[0031] In the present technical solution, the upper ladder frame, the crank arm ladder frame and the tension link components that enable the lower end body of the ladder frame installed on the frame of the engineering vehicle to be in an adjustable height state are important technical features. In the technical field of ladder climbing devices for engineering vehicles with lifting legs, it has novelty, creativity and practicality. The terms in the present technical solution can be explained and understood using the patent literature in this technical field. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 It is a schematic diagram of the utility model.

[0034] Figure 2 It is a three-dimensional structural schematic diagram of the utility model.

[0035] Figure 3 This is a schematic diagram of the folded and closed state of the utility model.

[0036] Upper ladder frame-1, crank arm ladder frame-2, rocker arm ladder frame-3, pull rod ladder frame-4, connecting seat-5, tension spring-6, plate part-11, ladder rod part I-12, seat part-51, spring seat part I-52, rod part-41, ladder rod part II-42, rocker arm part-31, ladder rod part III-32, spring seat part II-33, crank arm part-21, ladder rod part IV-22. DETAILED DESCRIPTION

[0037] According to the Examination Guidelines, terms such as “having”, “including” and “comprising” used in the present invention should be understood as not precluding the existence or addition of one or more other elements or combinations thereof.

[0038] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In addition, the technical features involved in the different embodiments of the utility model described below can be combined with each other as long as they do not conflict with each other. In addition, unless otherwise specified, the equipment and materials used in the following embodiments are commercially available. If the processing conditions are not clearly stated, please refer to the purchased product manual or proceed according to conventional methods in the field.

[0041] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0042] Figure 1 This is the first embodiment of the utility model, which is specifically described in conjunction with the accompanying drawings. It includes an upper ladder frame 1, a crank arm ladder frame 2, a rocker arm ladder frame 3, a pull rod ladder frame 4, a connecting seat 5 and a tension spring 6, and a connecting seat 5 is provided on the upper ladder frame 1, a rocker arm ladder frame 3 and a pull rod ladder frame 4 are respectively provided on the connecting seat 5, and a tension spring 6 is provided between the rocker arm ladder frame 3 and the connecting seat 5, and a crank arm ladder frame 2 is provided between the rocker arm ladder frame 3 and the pull rod ladder frame 4.

[0043] In this embodiment, the upper ladder frame 1 is configured to include a plate portion 11 and a ladder rod portion Ⅰ12, and the ends of the ladder rod portion Ⅰ12 are respectively configured to be connected to the inner side surfaces of the plate portion 11, the lower end surface portion of the ladder rod portion Ⅰ12 located at the lower position of the plate portion 11 and the lower portion of the inner side surface of the plate portion 11 are respectively configured to be connected to the connecting seat 5, and the inner end surface portion of the plate portion 11 is configured to be connected to the frame of the engineering vehicle, the plate portion 11 is configured to be a trapezoidal sheet body and the ladder rod portion Ⅰ12 is configured to be a rectangular rod body, and the ladder rod portion Ⅰ12 is configured to be arranged and distributed at intervals along the vertical center line of the plate portion 11.

[0044] A supporting connection point for the connecting seat 5 is formed by the upper ladder frame 1, the connection with the connecting seat 5 is realized by the ladder rod part Ⅰ12, and the connection with the engineering vehicle frame is realized by the plate part 11. Its technical purpose is to serve as a supporting carrier for the connecting seat 5.

[0045] In this embodiment, the connecting seat 5 is configured to include a seat portion 51 and a spring seat portion I52, and the middle of the transverse outer end surface of the seat portion 51 is configured to be connected to the longitudinal lower end surface portion of the spring seat portion I52, the transverse outer end surface of the seat portion 51 and the transverse inner side surface of the seat portion 51 are respectively configured to be connected to the upper ladder frame 1 and the spring seat portion I52 is configured to be connected to the tension spring 6, the vertical outer end head of the seat portion 51 is configured to be connected to the pull rod ladder frame 4 through a pin shaft and the vertical inner end head of the seat portion 51 is configured to be connected to the rocker arm ladder frame 3 through a pin shaft, the seat portion 51 is configured to be an L-shaped sheet pile body and the spring seat portion I52 is configured to be an L-shaped strip body with a through hole body in the vertical portion, and the through hole body of the spring seat portion I52 is configured to be connected to the tension spring 6.

[0046] Through the connecting seat 5, a supporting connection point for the upper ladder frame 1, the rocker ladder frame 3, the pull rod ladder frame 4 and the tension spring 6 is formed. The seat portion 51 realizes the connection with the upper ladder frame 1, the rocker ladder frame 3, the pull rod ladder frame 4, and the spring seat portion Ⅰ52 realizes the connection with the tension spring 6. Its technical purpose is to serve as a supporting carrier for the rocker ladder frame 3, the pull rod ladder frame 4 and the tension spring 6.

[0047] In this embodiment, the pull rod ladder frame 4 is configured to include a rod portion 41 and a ladder rod portion II 42, and the ends of the ladder rod portion II 42 are respectively configured to be connected to the lower inner side surface of the rod portion 41, the upper end of the rod portion 41 is configured to be connected to the connecting seat 5 through a pin shaft and the lower end of the rod portion 41 is configured to be connected to the crank arm ladder frame 2 through a pin shaft, the rod portion 41 is configured to be a strip-shaped sheet body and the ladder rod portion II 42 is configured to be a rectangular rod-shaped body.

[0048] A supporting connection point for the crank arm ladder frame 2 and the connecting seat 5 is formed by the pull rod ladder frame 4. The connection with the crank arm ladder frame 2 and the connecting seat 5 is realized by the rod portion 41. The connection processing for the operator to step on is realized by the ladder rod portion II 42. Its technical purpose is to be used as one of the components for connecting the crank arm ladder frame 2 and the connecting seat 5.

[0049] In the present embodiment, the rocker ladder frame 3 is configured to include a rocker arm portion 31, a ladder rod portion III32 and a spring seat portion II33, and the ends of the ladder rod portion III32 are respectively configured to be connected to the lower portion of the inner side surface of the rocker arm portion 31, the outer portion of the upper end surface of the ladder rod portion III32 is configured to be connected to the lower end surface portion of the spring seat portion II33, and the spring seat portion II33 is configured to be connected to the tension spring 6, the upper end head of the rocker arm portion 31 is configured to be connected to the connecting seat 5 through a pin shaft and the lower end head of the rocker arm portion 31 is configured to be connected to the crank arm ladder frame 2 through a pin shaft, the rocker arm portion 31 is configured to be a strip-shaped sheet body and the ladder rod portion II42 is configured to be a rectangular rod-shaped body, the spring seat portion II33 is configured to be a block body with a through hole body, and the through hole body of the spring seat portion II33 is configured to be connected to the tension spring 6.

[0050] Through the rocker arm ladder frame 3, a supporting connection point for the crank arm ladder frame 2, the connecting seat 5 and the tension spring 6 is formed. The rocker arm part 31 realizes the connection with the crank arm ladder frame 2 and the connecting seat 5. The spring seat part II 33 realizes the connection with the tension spring 6. The ladder rod part III 32 realizes the connection processing for the operator to step on. Its technical purpose is to serve as the second component for connecting the crank arm ladder frame 2 and the connecting seat 5.

[0051] In this embodiment, the tension spring 6 is configured as a columnar spring and one end of the tension spring 6 is configured to be hung and connected to the rocker ladder frame 3, and the other end of the tension spring 6 is configured to be hung and connected to the connecting seat 5.

[0052] By stretching the spring 6, a supporting connection point for the rocker arm ladder frame 3 and the connecting seat 5 is formed. The stretching spring 6 realizes the connection with the rocker arm ladder frame 3 and the connection with the connecting seat 5. Its technical purpose is to serve as a component for connecting the rocker arm ladder frame 3 and the connecting seat 5.

[0053] In this embodiment, the crank arm ladder frame 2 is configured to include a crank arm portion 21 and a ladder rod portion IV22, and the ends of the ladder rod portion IV22 are respectively configured to be connected to the inner side surfaces of the horizontal portion of the crank arm ladder frame 2, the vertical end of the crank arm portion 21 is configured to be connected to the rocker arm ladder frame 3 through a pin shaft, and the middle corner portion of the crank arm portion 21 is configured to be connected to the pull rod ladder frame 4 through a pin shaft, the crank arm portion 21 is configured to be an L-shaped strip sheet body and the ladder rod portion IV22 is configured to be a rectangular rod body, and the ladder rod portion IV22 is configured to be arranged and distributed at intervals along the horizontal center line of the crank arm portion 21.

[0054] A supporting connection point for the rocker arm ladder frame 3 and the pull rod ladder frame 4 is formed through the crank arm ladder frame 2. The crank arm portion 21 realizes connection with the rocker arm ladder frame 3 and the pull rod ladder frame 4. The ladder rod portion IV 22 realizes connection processing for the operator to step on. The technical purpose is to serve as a component for the operator to start stepping on.

[0055] In this embodiment, the upper ladder frame 1 and the crank arm ladder frame 2, the rocker arm ladder frame 3, the pull rod ladder frame 4 and the tension spring 6 are arranged to be distributed in the form of a lower retractable pedal body, and the upper ladder frame 1, the crank arm ladder frame 2, the rocker arm ladder frame 3, the pull rod ladder frame 4 and the tension spring 6 and the connecting seat 5 are arranged to be distributed in the form of an upper connecting body. The center lines of the upper ladder frame 1, the crank arm ladder frame 2, the rocker arm ladder frame 3 and the pull rod ladder frame 4 are arranged on the same straight line. A connecting seat 5 and a tension spring 6 are arranged to form a group of side connecting components. The two groups of side connecting components are respectively arranged between the rocker arm ladder frame 3 and the pull rod ladder frame 4 and the upper ladder frame 1. The rod portion 41 and the rocker arm portion 31 are respectively arranged to be connected to the crank arm portion 21 and the seat portion 51, and the ladder rod portion Ⅰ12 and the plate portion 11 located at the lower position of the plate portion 11 are respectively arranged to be connected to the seat portion 51.

[0056] The method of using this embodiment is as follows: the inner end surface of the plate portion 11 is connected to the frame of the engineering vehicle, one end of the tension spring 6 is connected to the through hole body of the spring seat portion II 33, and the other end of the tension spring 6 is connected to the through hole body of the spring seat portion I 52, and an upward thrust is applied to the rocker arm portion 31 to make the rod portion 41 in a horizontal state, and the tension spring 6 applies a downward pulling force to the rocker arm portion 31 to make the rod portion 41, the rocker arm portion 31 and the crank arm portion 21 in a folded and closed state. When the operator needs to go to the aerial work platform, an outward pulling force is applied to the rocker arm portion 31 to make the rocker arm portion 31 and the rod portion 41 in a vertical state. To a vertical state, the tension spring 6 applies an upward pulling force to the rocker arm portion 31, so that the rod portion 41, the rocker arm portion 31 and the turning arm portion 21 are in an expanded state, and the operator climbs onto the ladder rod portion Ⅰ12 located at the lower position of the plate portion 11 through the ladder rod portion Ⅳ22, the ladder rod portion Ⅱ42 and the ladder rod portion Ⅲ32, and then climbs to the aerial work platform through the ladder rod portion Ⅰ12. When the operator returns to the ground from the aerial work platform through the ladder rod portion Ⅰ12, the ladder rod portion Ⅲ32, the ladder rod portion Ⅱ42 and the ladder rod portion Ⅳ22, an upward thrust is applied to the rocker arm portion 31, so that the rod portion 41, the rocker arm portion 31 and the turning arm portion 21 are in a folded and closed state.

[0057] When verifying the utility model, the inventor abandoned the existing technical feature of using an integral ladder frame installed on the frame of the engineering vehicle so that the lower end of the integral ladder frame is relatively close to the ground, and first proposed a technical feature of making the lower end of the ladder frame installed on the frame of the engineering vehicle in an adjustable height state, thereby obtaining the first unexpected technical effect: the lifting and unfolding and closing of the crank arm ladder frame 2 is realized, instead of the flipping and unfolding and closing, thereby optimizing the operating space, and obtaining the second unexpected technical effect: the triangular body formed with the crank arm part 21 is realized The connection improves the supporting stability of the crank arm 21, and obtains the third unexpected technical effect: the interval point lifting connection of the crank arm 21 is realized, and the connection strength of the crank arm 21 is improved, and the fourth unexpected technical effect is obtained: the spring body is realized as an intermediate buffer energy, and the operating torque value is optimized, and the fifth unexpected technical effect is obtained: the length of the rod part 41, the length of the rocker arm part 31 and the length of the vertical part of the crank arm part 21 are optimized, the lifting stroke of the horizontal part of the crank arm part 21 is increased, and the driving performance of the engineering vehicle is improved.

[0058] In the second embodiment of the utility model, the upper ladder frame 1, the crank arm ladder frame 2 and the tension link member are connected to each other in such a manner that the lower end body of the ladder frame mounted on the frame of the engineering vehicle is in an adjustable height position state.

[0059] In this embodiment, the tension link member is connected to the upper ladder frame 1 and the crank ladder frame 2 in a manner of connecting for lifting motion.

[0060] In this embodiment, the tension link component is configured to include a rocker ladder frame 3, a pull rod ladder frame 4 and a tension spring 6.

[0061] In this embodiment, a first accessory device is further included and is arranged between the tension link component and the upper ladder frame 1 , and the first accessory device is arranged as a connecting seat 5 .

[0062] The second embodiment of the present utility model is based on the first embodiment.

[0063] The utility model has the following characteristics:

[0064] 1. Due to the design of the upper ladder frame 1, the crank arm ladder frame 2 and the tension link component, a split ladder setting is realized through the upper ladder frame 1 and the crank arm ladder frame 2, and the crank arm ladder frame 2 is connected for lifting movement through the tension link component, so that the lower end of the ladder frame installed on the frame of the engineering vehicle is in a state of adjustable height position, which solves the technical problem that an integral ladder frame is installed on the frame of the engineering vehicle and the lower end of the integral ladder frame is relatively close to the ground, thereby improving the passing performance of the engineering vehicle with lifting legs.

[0065] 2. Due to the design of the rocker arm ladder frame 3, the pull rod ladder frame 4 and the tension spring 6, the crank arm ladder frame 2 is connected to a mechanism body with elastic energy storage.

[0066] 3. Due to the design of the connecting seat 5, the beam connection of the rocker ladder frame 3, the pull rod ladder frame 4 and the tension spring 6 is realized.

[0067] 4. Since the design limits the numerical range of the structural shape, the numerical range is the technical feature in the technical solution of the utility model, and is not a technical feature calculated by formula or obtained through a limited number of tests. Tests have shown that the technical features of this numerical range have achieved good technical effects.

[0068] 5. Due to the design of the technical features of the utility model, the effects of the individual and combined technical features have been shown through experiments to have various performance indicators of the utility model that are at least 1.7 times the existing performance indicators, and the evaluation shows that the utility model has a good market value.

[0069] There are other technical features that connect the upper ladder frame 1, the crank arm ladder frame 2 and the tension link component so that the lower end body of the ladder frame installed on the frame of the engineering vehicle is in an adjustable height state, which are all embodiments of the present utility model, and the various technical features of the above-mentioned embodiments can be combined arbitrarily. In order to meet the requirements of the Patent Law, Patent Implementation Rules and Examination Guidelines, all possible combinations of the various technical features in the above-mentioned embodiments will no longer be described.

[0070] Therefore, in the technical field of ladder climbing devices for engineering vehicles with lifting legs, all technical contents including an upper ladder frame 1 installed on the frame of the engineering vehicle, a crank arm ladder frame 2 used as a lower stepping body, and a tension link component arranged between the crank arm ladder frame 2 and the upper ladder frame 1 are within the protection scope of the present utility model.

Claims

1. A ladder climbing device for an engineering vehicle with lifting legs, characterized by: The invention comprises an upper ladder frame (1) installed on a frame of an engineering vehicle, a crank arm ladder frame (2) used as a lower pedal body, and a tension link component arranged between the crank arm ladder frame (2) and the upper ladder frame (1). The tension link component is configured to include a rocker ladder frame (3), a pull rod ladder frame (4) and a tension spring (6). It also includes a first accessory device, and the first accessory device is arranged between the tension link component and the upper ladder frame (1), and the first accessory device is arranged as a connecting seat (5). A connecting seat (5) is arranged on the upper ladder frame (1), a rocker ladder frame (3) and a pull rod ladder frame (4) are respectively arranged on the connecting seat (5), a tension spring (6) is arranged between the rocker ladder frame (3) and the connecting seat (5), and a crank ladder frame (2) is arranged between the rocker ladder frame (3) and the pull rod ladder frame (4).

2. The ladder climbing device for an engineering vehicle with lifting legs according to claim 1, characterized in that: The upper ladder frame (1), the crank arm ladder frame (2) and the tension link component are connected to each other in such a way that the lower end of the ladder frame installed on the frame of the engineering vehicle is in a state in which the height position can be adjusted.

3. The ladder climbing device for an engineering vehicle with lifting legs according to claim 2, characterized in that: The tension link component is connected to the upper ladder frame (1) and the crank arm ladder frame (2) in a manner of connecting for lifting motion.

4. The ladder climbing device for an engineering vehicle with lifting legs according to claim 1, characterized in that: The upper ladder frame (1) is configured to include a plate portion (11) and a ladder rod portion I (12), and the ends of the ladder rod portion I (12) are respectively configured to be connected to the inner side surface of the plate portion (11), the lower end surface of the ladder rod portion I (12) located at the lower position of the plate portion (11) and the lower part of the inner side surface of the plate portion (11) are respectively configured to be connected to the connecting seat (5), and the inner end surface of the plate portion (11) is configured to be connected to the frame of the engineering vehicle, the plate portion (11) is configured to be a trapezoidal sheet body, and the ladder rod portion I (12) is configured to be a rectangular rod body, and the ladder rod portion I (12) is configured to be arranged and distributed at intervals along the vertical center line of the plate portion (11).

5. The ladder climbing device for an engineering vehicle with lifting legs according to claim 1, characterized in that: The crank arm ladder frame (2) is configured to include a crank arm portion (21) and a ladder rod portion IV (22), and the ends of the ladder rod portion IV (22) are respectively configured to be connected to the inner side surfaces of the horizontal portion of the crank arm ladder frame (2), the vertical end of the crank arm portion (21) is configured to be connected to the rocker arm ladder frame (3) through a pin shaft, and the middle corner portion of the crank arm portion (21) is configured to be connected to the pull rod ladder frame (4) through a pin shaft, the crank arm portion (21) is configured to be an L-shaped strip sheet body, and the ladder rod portion IV (22) is configured to be a rectangular rod body, and the ladder rod portion IV (22) is configured to be arranged and distributed at intervals along the horizontal center line of the crank arm portion (21).

6. The ladder climbing device for an engineering vehicle with lifting legs according to claim 1, characterized in that: The pull rod ladder frame (4) is configured to include a rod portion (41) and a ladder rod portion II (42), and the ends of the ladder rod portion II (42) are respectively configured to be connected to the lower portion of the inner side surface of the rod portion (41), the upper end of the rod portion (41) is configured to be connected to the connecting seat (5) through a pin shaft, and the lower end of the rod portion (41) is configured to be connected to the crank arm ladder frame (2) through a pin shaft, the rod portion (41) is configured to be a strip-shaped sheet body, and the ladder rod portion II (42) is configured to be a rectangular rod-shaped body, Or, the rocker ladder frame (3) is configured to include a rocker arm portion (31), a ladder rod portion III (32) and a spring seat portion II (33), and the ends of the ladder rod portion III (32) are respectively configured to be connected to the lower portion of the inner side surface of the rocker arm portion (31), the outer portion of the upper end surface of the ladder rod portion III (32) is configured to be connected to the lower end surface portion of the spring seat portion II (33), and the spring seat portion II (33) is configured to be connected to the tension spring (6), the upper end of the rocker arm portion (31) is configured to be connected to the connecting seat (5) through a pin shaft, and the lower end of the rocker arm portion (31) is configured to be connected to the crank arm ladder frame (2) through a pin shaft, the rocker arm portion (31) is configured to be a strip-shaped sheet body, and the ladder rod portion II (42) is configured to be a rectangular rod-shaped body, the spring seat portion II (33) is configured to be a block body having a through hole body, and the through hole body of the spring seat portion II (33) is configured to be connected to the tension spring (6), Alternatively, the tension spring (6) is configured as a column spring and one end of the tension spring (6) is configured to be connected in a hanging manner to the rocker ladder frame (3), and the other end of the tension spring (6) is configured to be connected in a hanging manner to the connecting seat (5).

7. The ladder climbing device for an engineering vehicle with lifting legs according to claim 1, characterized in that: The connecting seat (5) is configured to include a seat portion (51) and a spring seat portion I (52), and the middle of the transverse outer end surface of the seat portion (51) is configured to be connected to the longitudinal lower end surface of the spring seat portion I (52), the transverse outer end surface of the seat portion (51) and the transverse inner side surface of the seat portion (51) are respectively configured to be connected to the upper ladder frame (1), and the spring seat portion I (52) is configured to be connected to the tension spring (6), the vertical outer end head of the seat portion (51) is configured to be connected to the pull rod ladder frame (4) through a pin shaft, and the vertical inner end head of the seat portion (51) is configured to be connected to the rocker ladder frame (3) through a pin shaft, the seat portion (51) is configured to be an L-shaped sheet pile body, and the spring seat portion I (52) is configured to be an L-shaped strip body with a through hole body in the vertical portion, and the through hole body of the spring seat portion I (52) is configured to be connected to the tension spring (6).

8. The ladder climbing device for an engineering vehicle with lifting legs according to any one of claims 1 to 7, characterized in that: The upper ladder frame (1) and the crank arm ladder frame (2), the rocker arm ladder frame (3), the pull rod ladder frame (4) and the tension spring (6) are arranged to be distributed in the manner of a lower retractable pedaling body, and the upper ladder frame (1), the crank arm ladder frame (2), the rocker arm ladder frame (3), the pull rod ladder frame (4) and the tension spring (6) and the connecting seat (5) are arranged to be distributed in the manner of an upper connecting body. Alternatively, the center line of the upper ladder frame (1), the center line of the crank arm ladder frame (2), the center line of the rocker arm ladder frame (3) and the center line of the pull rod ladder frame (4) are arranged on the same straight line, a connecting seat (5) and a tension spring (6) are arranged to form a group of side connecting components, and the two groups of side connecting components are respectively arranged between the rocker arm ladder frame (3) and the pull rod ladder frame (4) and the upper ladder frame (1), the rod portion (41) and the rocker arm portion (31) are respectively arranged to be connected to the crank arm portion (21) and the seat portion (51), and the ladder rod portion I (12) and the plate portion (11) located at the lower position of the plate portion (11) are respectively arranged to be connected to the seat portion (51).

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