Plate spring limiting device, chassis and mining dump truck

Abstract

The utility model discloses a plate spring limiting device, a chassis and a mining dump truck. The plate spring limiting device comprises a plate spring assembly, a limiting seat and a wear-resisting plate, the plate spring assembly is located on the outer side face of the frame longitudinal beam. The plate spring assembly is composed of a plurality of leaf springs which are stacked up and down, and the leaf springs are fastened through a center threaded column and nuts matched with the center threaded column. A pair of opposite limiting seats are fixed to a middle drive axle and a rear drive axle respectively, the front end of a plate spring assembly is inserted into the limiting seat located on the middle drive axle, the rear end of the plate spring assembly is inserted into the limiting seat located on the rear drive axle, and the plate spring assembly is in clearance fit with the limiting seats so that the plate spring assembly can slide in the limiting seats. The two wear-resisting plates are arranged in the area, facing the plate spring assembly, of the outer side face of the frame longitudinal beam at intervals. The limiting device is arranged to limit the movement of the plate spring in a specified space, so that the danger that a drive axle, a transmission shaft and a thrust rod are broken due to the fact that the plate spring loses movement constraint is avoided.

Description

Technical Field

[0001] This utility model relates to a leaf spring limiting device, belonging to the field of mining machinery. Background Technology

[0002] Flexible wide-body mining dump trucks, currently with a load capacity of 60-80 tons, are widely used in small and medium-sized open-pit mines and earthwork construction projects. The truck-mounted mining sector is placing greater demands on the load capacity of wide-body mining dump trucks, trending towards 80-120 tons. With the increase in tonnage, and applications in humped and muddy conditions, the overall structural rigidity of the chassis is required to be high. However, flexible wide-body trucks suffer from severe chassis deformation and relatively weak overall rigidity. With rated loads approaching 120 tons, the leaf spring suspension system of mining dump trucks, as the wheels traverse dirt and uneven road surfaces, poses a risk of breakage to the drive axle, drive shaft, and thrust rod if the leaf springs are not properly restrained during movement, especially without proper space control. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this utility model provides a leaf spring limiting device. By arranging the limiting device, the movement of the leaf spring is restricted within a specified space. The limiting seat is made of a highly wear-resistant material to prevent excessive wear of the limiting seat and avoid the leaf spring losing its movement constraint, which could lead to the risk of breakage of the drive axle, transmission shaft, and thrust rod.

[0004] This utility model is achieved according to the following technical solution:

[0005] In a first aspect, this utility model provides a leaf spring limiting device, comprising:

[0006] The leaf spring assembly, used as an elastic element, is located on the outer side of the longitudinal beam of the vehicle frame; the leaf spring assembly is composed of multiple leaf springs stacked on top of each other, and the multiple leaf springs are fastened by a central threaded post and its matching nut;

[0007] A pair of opposing limiting seats are fixed on the middle and rear drive axles respectively. The front end of the leaf spring assembly is inserted into the limiting seat located on the middle drive axle, and the rear end of the leaf spring assembly is inserted into the limiting seat located on the rear drive axle. The leaf spring assembly and the limiting seat are clearance-fitted, so that the leaf spring assembly can slide in the limiting seat.

[0008] Two wear-resistant plates are spaced apart on the outer side of the frame longitudinal beam in the area facing the leaf spring assembly.

[0009] In some embodiments, the leaf spring assembly is composed of several leaf springs of the same length stacked on top of each other at the bottom and several leaf springs of gradually decreasing length stacked on top of each other in the upper middle part; wherein, the two ends of the several leaf springs of the same length at the bottom are respectively inserted into corresponding limiting seats.

[0010] In some embodiments, the limiting seat consists of a base plate and an n-shaped frame located on the base plate; the base plate is provided with a plurality of bolt holes and is fixed to the drive axle by bolts, and the end of the leaf spring assembly is inserted into the n-shaped frame.

[0011] In some embodiments, the top surface of the base plate is an upwardly convex arc-shaped surface that forms line contact with the leaf spring assembly.

[0012] In some embodiments, the n-shaped frame has a notch at the top of each of the two inner facades facing the center of the leaf spring assembly to increase the clearance between it and the leaf spring assembly in the front-rear direction.

[0013] In some embodiments, the limiting seat is a one-piece casting and is made of a wear-resistant material.

[0014] In some embodiments, the wear-resistant plate is provided with a plurality of through holes, and the outer side surface of the frame longitudinal beam is provided with a plurality of threaded holes corresponding to the through holes, and the wear-resistant plate is fixed to the frame longitudinal beam by a plurality of bolts.

[0015] Secondly, this utility model provides a chassis, comprising:

[0016] Middle and rear axles;

[0017] The frame consists of two longitudinal beams arranged side by side at a predetermined interval in the same plane and a crossbeam fixedly connected to the two longitudinal beams.

[0018] The two aforementioned leaf spring limiting devices are symmetrically arranged on both sides of the frame.

[0019] Thirdly, this utility model provides a mining dump truck, including the aforementioned leaf spring limiting device; or, including the aforementioned chassis.

[0020] The beneficial effects of this utility model are:

[0021] This utility model provides a leaf spring limiting device, which restricts the movement of the leaf spring within a specified space by arranging the limiting device. The limiting seat is made of a highly wear-resistant material to prevent excessive wear of the limiting seat and avoid the leaf spring losing its movement constraint, which could lead to the danger of breakage of the drive axle, transmission shaft, and thrust rod. Attached Figure Description

[0022] The accompanying drawings, as part of this utility model, are used to provide a further understanding of the present utility model. The illustrative embodiments and descriptions of the present utility model are used to explain the present utility model, but do not constitute an undue limitation of the present utility model. Obviously, the drawings described below are merely some embodiments; those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0023] In the attached diagram:

[0024] Figure 1 Assemble the leaf spring limiting device of this utility model Figure 1 ;

[0025] Figure 2 Assemble the leaf spring limiting device of this utility model Figure 2 ;

[0026] Figure 3 Assemble the leaf spring limiting device of this utility model Figure 3 ;

[0027] Figure 4 This is a schematic diagram of the limiting seat of this utility model.

[0028] Attached diagram labels: 1-Frame longitudinal beam, 2-Limit seat, 3-Leaf spring assembly, 4-Wear plate, 5-Bolt, 6-Center threaded post, 7-Notch.

[0029] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0031] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0032] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0033] like Figure 1 , Figure 2 , Figure 3 As shown, a leaf spring limiting device includes a leaf spring assembly 3, a limiting seat 2, and wear-resistant plates 4. The leaf spring assembly 3 is used as an elastic element and is located on the outer side of the longitudinal beam 1 of the vehicle frame. The leaf spring assembly 3 is composed of multiple leaf springs stacked on top of each other and is fastened by a central threaded post 6 and its matching nut. A pair of opposing limiting seats 2 are respectively fixed on the middle and rear drive axles. The front end of the leaf spring assembly 3 is inserted into the limiting seat 2 located on the middle drive axle, and the rear end of the leaf spring assembly 3 is inserted into the limiting seat 2 located on the rear drive axle. The leaf spring assembly 3 and the limiting seat 2 are clearance-fitted, allowing the leaf spring assembly 3 to slide in the limiting seat 2. Two wear-resistant plates 4 are spaced apart on the outer side of the longitudinal beam 1 in the area facing the leaf spring assembly 3.

[0034] The following provides a further explanation of the specific structure of the aforementioned leaf spring assembly.

[0035] like Figure 1 , Figure 2 , Figure 3 As shown, the leaf spring assembly 3 is composed of several leaf springs of the same length stacked on top of each other at the bottom and several leaf springs of gradually decreasing length stacked on top of each other at the middle and upper part; wherein, the two ends of the several leaf springs of the same length at the bottom are respectively inserted into the corresponding limiting seats 2.

[0036] The following provides a further explanation of the specific structure of the aforementioned limiting seat.

[0037] like Figure 4 As shown, the limiting seat 2 consists of a base plate and an n-shaped frame located on the base plate; the base plate is provided with multiple bolt holes and is fixed to the drive axle by bolts, and the end of the leaf spring assembly 3 is inserted into the n-shaped frame.

[0038] In a further design, the top surface of the base plate is a convex arc-shaped surface that forms a line contact with the leaf spring assembly 3.

[0039] Further options, such as Figure 4 As shown, the n-shaped frame has a notch 7 at the top of each of the two inner facades facing the center of the leaf spring assembly 3 to increase the gap between it and the leaf spring assembly 3 in the front-rear direction.

[0040] A further proposed solution is to make the limit seat 2 a one-piece casting, and to make it from a wear-resistant material.

[0041] The following provides a further explanation of the specific structure of the aforementioned wear-resistant plate.

[0042] like Figure 2 , Figure 3As shown, the wear-resistant plate 4 has multiple through holes, and the outer side of the frame longitudinal beam 1 has multiple threaded holes corresponding to the through holes. The wear-resistant plate 4 is fixed to the frame longitudinal beam 1 by multiple bolts 5.

[0043] This utility model also provides a chassis, including a middle axle, a rear axle, a frame, and two of the above-mentioned leaf spring limiting devices; the frame consists of two longitudinal beams arranged side by side at a predetermined interval in the same plane and a crossbeam fixedly connected to the two longitudinal beams; the two leaf spring limiting devices are symmetrically arranged on both sides of the frame.

[0044] As shown above, the four limiting seats and four wear-resistant plates provide vertical and horizontal constraints on the leaf spring assemblies on both sides. The leaf spring assemblies overlap within the two limiting seats, with no front-to-back constraints. Their maximum sliding distance is determined by the vehicle's input conditions. The limiting seats and wear-resistant plates are made of high-strength wear-resistant materials, with a wear life exceeding 3000 hours, and reaching 6000 hours under good working conditions.

[0045] Four limiting seats are fixed to the middle and rear drive axles, respectively. Each drive axle is symmetrically arranged on its left and right sides, with the leaf spring assembly on one side overlapping the inner arc surfaces of the two limiting seats. The limiting seats move with the drive axles. If the wheel on that side of the middle drive axle crosses an obstacle and the rear drive axle wheel touches the ground, the upper limiting seat on the middle drive axle generates an upward force, causing the leaf spring assembly to deform in the direction of contact with the leaf spring. Because the limiting seat is a closed frame, its top restricts excessive deformation of the leaf spring. Combined with the positional constraints of the vehicle's suspension movement, this ensures that the upper limiting function of the leaf spring is maintained when one side of the middle drive axle crosses an obstacle. In this state, the leaf spring assembly at the rear drive axle applies a compressive force to the limiting seats.

[0046] If the rear drive axle wheel crosses an obstacle and the middle drive axle wheel is in contact with the ground, the upper limit seat of the rear drive axle generates an upward force, causing the leaf spring assembly to deform in the direction of contact with the leaf spring. Because the limit seat is a closed frame, its top restricts excessive deformation of the leaf spring. Combined with the positional constraints of the vehicle's suspension movement, this ensures that the upper limit function of the leaf spring provides constraint when the rear drive axle crosses an obstacle on one side. In this state, the leaf spring assembly at the middle drive axle applies a compressive force to the limit seat.

[0047] The above discussion describes the upper limit constraint function of the leaf spring assembly. Based on this, we analyze the left and right limit functions. Under full load and overload conditions, since the center of gravity of the vehicle is located in the middle of the frame, the load distribution on the left and right sides is uneven. If the right side of the frame is heavier, the leaf spring assembly will be severely overloaded, and its left and right movement will intensify. The front and rear leaf springs of the leaf spring assembly will swing left and right. At this time, the two limit seats distributed on the right side of the frame will ensure that the leaf spring assembly moves under the specified constraint conditions during the left and right swing and floating of the front and rear leaf springs of the leaf spring assembly.

[0048] Under full load and overload conditions, since the center of gravity of the vehicle is located in the middle of the frame, the load distribution on the left and right sides is uneven. If the left side of the frame is heavier, the leaf spring assembly will move more violently due to severe overload. The front and rear leaf springs of the leaf spring assembly will swing left and right. At this time, the two limiting seats distributed on the left side of the frame will ensure that the leaf spring assembly moves under the specified constraint conditions during the left and right swinging and floating of the front and rear leaf springs of the leaf spring assembly.

[0049] Due to the long-term unbalanced load on the mine car, the leaf spring assemblies on both sides of the frame repeatedly swing left and right. The symmetrically arranged limit seats on both sides of the frame form a fixed span space to restrict the excessive free floating of the leaf springs. During the start-up and braking of the vehicle, the leaf spring assemblies move back and forth, overlapping on the inner arc surface of the limit seats. When the wear reaches one-third of the total length, they need to be replaced to prevent the leaf springs from losing their restraint when floating freely up and down and back and forth.

[0050] In summary, this utility model provides a leaf spring limiting device that restricts the movement of the leaf spring within a specified space by arranging the limiting device. The limiting seat is made of a highly wear-resistant material to prevent excessive wear of the limiting seat and avoid the leaf spring losing its movement constraint, which could lead to the risk of breakage of the drive axle, transmission shaft, and thrust rod.

[0051] The mining dump truck provided by this utility model is described below. The mining dump truck described below can be referred to in correspondence with the chassis described above.

[0052] The present invention provides a mining dump truck, which may include the chassis described in any of the above embodiments.

[0053] The beneficial effects achieved by the mining dump truck provided by this utility model are consistent with the beneficial effects achieved by the chassis provided by this utility model, so they will not be repeated here.

[0054] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0055] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features found in other embodiments but not others, combinations of features from different embodiments are also within the scope of protection of this invention and form different embodiments. For example, in the embodiments described above, those skilled in the art can use them in combination based on known technical solutions and the technical problems to be solved by this application.

[0056] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A leaf spring limiting device, characterized in that, include: The leaf spring assembly, used as an elastic element, is located on the outer side of the longitudinal beam of the vehicle frame; the leaf spring assembly is composed of multiple leaf springs stacked on top of each other, and the multiple leaf springs are fastened by a central threaded post and its matching nut; A pair of opposing limiting seats are fixed on the middle and rear drive axles respectively. The front end of the leaf spring assembly is inserted into the limiting seat located on the middle drive axle, and the rear end of the leaf spring assembly is inserted into the limiting seat located on the rear drive axle. The leaf spring assembly and the limiting seat are clearance-fitted, so that the leaf spring assembly can slide in the limiting seat. Two wear-resistant plates are spaced apart on the outer side of the frame longitudinal beam in the area facing the leaf spring assembly.

2. The leaf spring limiting device according to claim 1, characterized in that: The leaf spring assembly is composed of several leaf springs of the same length stacked on top of each other at the bottom and several leaf springs of gradually decreasing length stacked on top of each other in the upper middle part; wherein, the two ends of the several leaf springs of the same length at the bottom are respectively inserted into the corresponding limiting seats.

3. The leaf spring limiting device according to claim 1, characterized in that: The limiting seat consists of a base plate and an n-shaped frame located on the base plate; the base plate is provided with multiple bolt holes and is fixed to the drive axle by bolts; the end of the leaf spring assembly is inserted into the n-shaped frame.

4. The leaf spring limiting device according to claim 3, characterized in that: The top surface of the base plate is an upwardly convex arc-shaped surface, which forms line contact with the leaf spring assembly.

5. A leaf spring limiting device according to claim 3, characterized in that: The n-shaped frame has a notch at the top of each of the two inner facades facing the center of the leaf spring assembly to increase the clearance between it and the leaf spring assembly in the front-rear direction.

6. The leaf spring limiting device according to claim 1, characterized in that: The limiting seat is a one-piece casting and is made of wear-resistant material.

7. A leaf spring limiting device according to claim 1, characterized in that: The wear-resistant plate has multiple through holes, and the outer side of the frame longitudinal beam has multiple threaded holes that correspond one-to-one with the through holes. The wear-resistant plate is fixed to the frame longitudinal beam by multiple bolts.

8. A chassis, characterized in that, include: Middle and rear axles; The frame consists of two longitudinal beams arranged side by side at a predetermined interval in the same plane and a crossbeam fixedly connected to the two longitudinal beams. The leaf spring limiting device according to any one of claims 1 to 7 is symmetrically arranged on both sides of the vehicle frame.

9. A mining dump truck, characterized in that: It includes the leaf spring limiting device as described in any one of claims 1 to 7; or, it includes the chassis as described in claim 8.

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