Elastic suspension structure and engineering machine

Abstract

This utility model discloses an elastic suspension structure and engineering machinery. When the swing angle of the balance beam mounting assembly is small (at which point the elastic limiting device has not yet played a buffering role), the shock absorption device will reduce the transmission of vibration kinetic energy between the balance beam mounting assembly and the balance beam frame, thereby isolating or reducing the impact vibration from the track. When the balance beam mounting assembly reaches its maximum swing angle, the upper end of the balance beam mounting assembly will form an elastic limiting fit with the bottom edge of the frame side plate through the elastic limiting device (at which point the elastic limiting device plays a buffering role). The elastic limiting device will reduce the transmission of vibration kinetic energy between the balance beam mounting assembly and the frame side plate, thereby isolating or reducing the impact vibration from the track, with a significant buffering effect. As can be seen from the above analysis, this utility model, by setting up a shock absorption device and an elastic limiting device, can isolate or reduce the vibration transmitted from the track to the frame, improving the overall vehicle comfort.

Description

Technical Field

[0001] This utility model relates to the field of engineering machinery technology, and in particular to an elastic suspension structure and engineering machinery. Background Technology

[0002] Driven by both environmental pressures and the need for low operating costs, high-efficiency, energy-saving, and environmentally friendly electric bulldozers have become a trend in the bulldozer industry. However, bulldozers are tracked vehicles used for traction, and the impact and vibration during operation are significant, easily causing component failure and damage, especially critical components such as batteries and controllers after the electrification of construction machinery, which seriously affects their reliability. Therefore, most components in construction machinery are installed and connected to the chassis through shock absorbers to reduce the transmission of vibration. At the same time, designing an elastic suspension system to isolate and reduce the vibration transmitted from the tracks to the chassis is equally important.

[0003] Existing technology 1: Currently, bulldozer suspensions are mostly rigid, including a pivot or slat beam hinged to the drive wheel and the chassis, and a balance beam on the front half of the track-mounted trolley frame. This balance beam has a certain sway angle, which helps maintain the machine's balance on uneven surfaces, ensuring stable operation on complex terrain. However, this rigid suspension cannot isolate or reduce impact vibrations from the tracks.

[0004] Existing technology 2: The balance beam limiting and buffering technology currently disclosed for bulldozers only activates the buffering effect when the balance beam reaches its maximum swing angle and hits the limiting block; during most of the driving and operating time, the balance beam does not reach its maximum swing angle and remains a rigid connection. Utility Model Content

[0005] The purpose of this utility model is to provide an elastic suspension structure and engineering machinery to solve the technical problem of large impact vibration in existing electric bulldozers.

[0006] To achieve the above objectives, the present invention provides an elastic suspension structure, including a frame. The frame includes two frame side plates arranged horizontally, extending longitudinally. The rear ends of the two frame side plates are fixedly connected by a frame connecting plate, and the front ends are fixedly connected by a frame connecting rod. The front middle ends of the two frame side plates are fixedly connected by a balance beam. Pivot mounting assemblies are respectively provided on the outer sides of the rear middle ends of the two frame side plates. A left support frame and a right support frame are respectively provided on the outer sides of the two frame side plates, with the lengths of the left and right support frames extending longitudinally. Extending forward and backward, the rear ends of the left and right frame frames are hinged to the adjacent side panels of the frame via a pivot mounting assembly, the axial direction of which extends left and right. A balance beam mounting assembly is located below the balance beam frame, its length extending left and right. The middle of the balance beam mounting assembly is hinged to the middle of the balance beam frame via a shock-absorbing device. Elastic limiting devices are provided between the left and right ends of the balance beam mounting assembly and the bottom edges of the two side panels of the frame for elastic limiting engagement. The left and right ends of the balance beam mounting assembly are hinged to the left and right frame frames, respectively.

[0007] Furthermore, the rear end of the left platform and the rear end of the right platform are hinged to the adjacent pivot mounting assembly via pivot sleeves, the pivot sleeves extending axially to the left and right.

[0008] Furthermore, the pivot sleeve is a plastic pivot sleeve.

[0009] Furthermore, the balance beam frame has an internal swing groove with an opening at the bottom. The balance beam mounting assembly is located inside the swing groove. The middle of the balance beam mounting assembly is hinged to the middle of the swing groove via the shock absorption device. The left and right ends of the balance beam mounting assembly pass through the opening and are located on the outer sides of the left and right ends of the swing groove, respectively. The two elastic limiting devices are respectively located at the bottom edges of the two frame side plates.

[0010] Furthermore, the middle of the balance beam, the swing groove, and the slot is recessed downwards, and the left and right ends of the balance beam, the swing groove, and the slot are inclined upwards towards the two side plates of the vehicle frame, respectively.

[0011] Furthermore, the balance beam mounting assembly includes a balance beam, the damping device, and a pin assembly. The balance beam extends horizontally, and the damping device is fitted into the middle mounting hole of the balance beam. The damping device is sleeved on the outside of the pin assembly, and the pin assembly extends axially forward and backward. The pin assembly is located in the middle of the swing groove, and the front and rear ends of the pin assembly are respectively installed and engaged with the front and rear side walls of the swing groove.

[0012] Furthermore, the balance beam mounting assembly also includes bushings, with the bushings fitted onto the front and rear ends of the pin assembly, and the front and rear ends of the pin assembly respectively engaging with the front and rear side walls of the swing groove through the bushings.

[0013] Furthermore, the shock absorption device includes an outer steel sleeve, a shock absorption elastomer, and an inner steel sleeve. The inner steel sleeve is disposed inside the outer steel sleeve, the shock absorption elastomer is disposed between the outer steel sleeve and the inner steel sleeve, the outer steel sleeve mates with the intermediate mounting hole of the balance beam, and the inner steel sleeve is sleeved on the outside of the pin assembly.

[0014] Furthermore, the elastic limiting device includes a mounting plate and a limiting elastic body. The limiting elastic body is disposed at the bottom of the mounting plate. The height direction of the limiting elastic body is a variable cross-section structure. The two mounting plates are respectively installed on the bottom edges of the two side plates of the vehicle frame. The end of the balance beam can elastically engage with the limiting elastic body upwards. The left and right ends of the balance beam are respectively hinged to the left frame and the right frame through hinge shafts. The axial direction of the hinge shafts extends forward and backward.

[0015] This utility model also provides an engineering machinery, including a main body of the engineering machinery and an elastic suspension structure as described in any of the above technical solutions, wherein the elastic suspension structure is disposed on the main body of the engineering machinery.

[0016] In summary, the application of the technical solution of this utility model has the following beneficial effects: The structural design of this utility model is reasonable. (1) By setting up a frame, the frame includes two frame side plates arranged along the left and right sides. The length of the two frame side plates extends along the front and rear. The rear ends of the two frame side plates are fixedly connected by a frame connecting plate. The front ends of the two frame side plates are fixedly connected by a frame connecting rod. The front middle ends of the two frame side plates are fixedly connected by a balance beam frame. The outer side of the rear middle ends of the two frame side plates are respectively provided with a pivot mounting assembly; thereby, a frame structure of an engineering machinery (such as a bulldozer) can be formed. (2) By setting a left frame and a right frame on the outside of two frame side plates respectively, the length of the left frame and the right frame extends along the front and back. The rear end of the left frame and the rear end of the right frame are hinged to the adjacent frame side plates through a pivot mounting assembly. The axis of the pivot mounting assembly extends along the left and right. Thus, the tracks of engineering machinery (such as bulldozers) can be wrapped around the outside of the left frame and the right frame. When encountering uneven road surfaces during operation, the left frame and the right frame can swing up and down around the pivot mounting assembly to a certain extent. (3) A balance beam mounting assembly is installed below the balance beam frame. The length of the balance beam mounting assembly extends left and right. The middle of the balance beam mounting assembly is hinged to the middle of the balance beam frame through a shock-absorbing device. The left and right ends of the balance beam mounting assembly are respectively provided with elastic limiting devices between the bottom edges of the two frame side plates for elastic limiting cooperation. The left and right ends of the balance beam mounting assembly are respectively hinged to the left platform and the right platform. Thus, when the left platform and the right platform swing up and down around the pivot mounting assembly to a certain extent, the adaptive up and down swing of the balance beam mounting assembly can maintain the balance of the whole machine and ensure that the construction machinery (such as bulldozers) can operate stably on complex terrain. At this time, there are two situations: Situation 1 (generally for most of the driving operation time), when the swing angle of the balance beam mounting assembly is small (at this time, the elastic limiting device has not yet played a buffering role), the shock-absorbing device will reduce the transmission of vibration kinetic energy between the balance beam mounting assembly and the balance beam frame, thereby isolating or reducing the impact vibration from the track. In scenario 2 (under special operating conditions), when the balance beam mounting assembly reaches its maximum swing angle, the upper end of the balance beam mounting assembly will form an elastic limiting engagement with the bottom edge of the frame side plate through the elastic limiting device (at this time, the elastic limiting device plays a buffering role). The elastic limiting device will reduce the transmission of vibration kinetic energy between the balance beam mounting assembly and the frame side plate, thereby isolating or reducing the impact vibration from the track, with a significant buffering effect. As can be seen from the above analysis, this utility model, by setting up a shock absorption device and an elastic limiting device, can isolate or reduce the vibration transmitted from the track to the frame, improve the overall vehicle comfort, and improve the reliability of the three electrical components (i.e., battery, motor, and electronic controller) subsequently installed on the frame. Attached Figure Description

[0017] Figure 1This is a three-dimensional structural diagram of the elastic suspension structure of this utility model; Figure 2 This is a three-dimensional structural schematic diagram of the balance beam mounting assembly of the elastic suspension structure of this utility model; Figure 3 This is a cross-sectional structural schematic diagram of the balance beam mounting assembly of the elastic suspension structure of this utility model; Figure 4 This is a three-dimensional structural diagram of the shock absorption device of the elastic suspension structure of this utility model; Figure 5 This is a three-dimensional structural diagram of the elastic limiting device of the elastic suspension structure of this utility model; Explanation of reference numerals in the attached drawings: frame (10), pivot mounting assembly (20), left frame (30), elastic limiting device (40), balance beam mounting assembly (50), right frame (60), hinge shaft (70); balance beam frame (11), frame side plate (12), frame connecting plate (13), frame connecting rod (14), swing groove (15), slot (16); pivot bushing (21); mounting plate (41), limiting elastic body (42); balance beam (51), shock absorber (52), bushing (53), pin assembly (54); outer steel sleeve (521), shock absorber elastic body (522), inner steel sleeve (523). Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model, but this does not constitute a limitation on the scope of protection of the present utility model.

[0019] In this utility model, for clearer description, the following explanation is provided: The observer faces the attached... Figure 1 In this observation, the lower left side of the observer is designated as the front, the upper right side as the rear, the upper left side as the right, the lower right side as the left, the top of the observer as the top, and the bottom of the observer as the bottom. It should be noted that the terms "front end," "rear end," "left side," "right side," "middle," "above," and "below" used in this document indicate the orientation or positional relationship based on the accompanying drawings. These are merely for the purpose of clearly describing this utility model and do not indicate or imply that the structure or component referred to must have a specific orientation or be constructed in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," "third," and "fourth" are used only for the purpose of clarity or simplification of description and should not be construed as indicating or implying relative importance or quantity.

[0020] See Figures 1 to 5This embodiment provides an elastic suspension structure, including a frame 10. The frame 10 includes two frame side plates 12 arranged horizontally. The length of the two frame side plates 12 extends longitudinally. The rear ends of the two frame side plates 12 are fixedly connected by a frame connecting plate 13, and the front ends of the two frame side plates 12 are fixedly connected by a frame connecting rod 14. The front middle ends of the two frame side plates 12 are fixedly connected by a balance beam 11. Pivot mounting assemblies 20 are respectively provided on the outer sides of the rear middle ends of the two frame side plates 12. A left support frame 30 and a right support frame 60 are respectively provided on the outer sides of the two frame side plates 12. The lengths of the left support frame 30 and the right support frame 60 extend longitudinally. The rear ends of the left frame 30 and the right frame 60 are hinged to the adjacent frame side plates 12 via a pivot mounting assembly 20, which extends axially to the left and right. A balance beam mounting assembly 50 is provided below the balance beam frame 11, which extends axially to the left and right. The middle of the balance beam mounting assembly 50 is hinged to the middle of the balance beam frame 11 via a shock absorber 52. The left and right ends of the balance beam mounting assembly 50 are respectively provided with elastic limiting devices 40 between the bottom edges of the two frame side plates 12 for elastic limiting. The left and right ends of the balance beam mounting assembly 50 are respectively hinged to the left frame 30 and the right frame 60. Functions: (1) By setting up a frame, the frame includes two frame side plates arranged along the left and right sides. The length of the two frame side plates extends along the front and rear. The rear ends of the two frame side plates are fixedly connected by a frame connecting plate. The front ends of the two frame side plates are fixedly connected by a frame connecting rod. The front middle ends of the two frame side plates are fixedly connected by a balance beam. The outer sides of the rear middle ends of the two frame side plates are respectively provided with pivot mounting assemblies. Thus, a frame structure of an engineering machinery (such as a bulldozer) can be formed. (2) By setting up a left platform and a right platform on the outer sides of the two frame side plates, the length of the left platform and the right platform extends along the front and rear. The rear ends of the left platform and the right platform are hinged to the adjacent frame side plates by a pivot mounting assembly. The axial direction of the pivot mounting assembly extends along the left and right sides. Thus, the tracks of the engineering machinery (such as a bulldozer) can be wrapped around the outside of the left platform and the right platform. When encountering uneven road surfaces during operation, the left platform and the right platform can swing up and down around the pivot mounting assembly to a certain extent. (3) A balance beam mounting assembly is provided below the balance beam frame. The length of the balance beam mounting assembly extends along the left and right sides. The middle of the balance beam mounting assembly is hinged to the middle of the balance beam frame through a shock-absorbing device. The left and right ends of the balance beam mounting assembly are respectively provided with elastic limiting devices between the bottom edges of the two frame side plates for elastic limiting cooperation. The left and right ends of the balance beam mounting assembly are respectively hinged to the left platform and the right platform. Thus, when the left platform and the right platform swing up and down around the pivot mounting assembly to a certain extent, the adaptability of the balance beam mounting assembly can maintain the balance of the whole machine by swinging up and down, ensuring that the construction machinery (such as bulldozers) can operate stably on complex terrain.There are two scenarios: Scenario 1 (generally during most driving operations): When the swing angle of the balance beam mounting assembly is small (at this time, the elastic limiting device has not yet played a buffering role), the shock absorption device will reduce the transmission of vibration kinetic energy between the balance beam mounting assembly and the balance beam frame, thereby isolating or reducing the impact vibration from the track. Scenario 2 (in special driving operations): When the balance beam mounting assembly reaches its maximum swing angle, the upper end of the balance beam mounting assembly will form an elastic limiting fit with the bottom edge of the frame side plate through the elastic limiting device (at this time, the elastic limiting device plays a buffering role). The elastic limiting device will reduce the transmission of vibration kinetic energy between the balance beam mounting assembly and the frame side plate, thereby isolating or reducing the impact vibration from the track, with a significant buffering effect. From the above analysis, it can be seen that this utility model, by setting a shock absorption device and an elastic limiting device, can isolate or reduce the vibration transmitted from the track to the frame, improve the overall vehicle comfort, and improve the reliability of the three electrical components (i.e., battery, motor, and electronic controller) subsequently installed on the frame.

[0021] Specifically, the rear ends of the left frame 30 and the right frame 60 are hinged to the adjacent pivot mounting assembly 20 via pivot sleeves 21, which extend axially to the left and right. Function: The pivot mounting assembly hinges the rear ends of the left frame 30 and the right frame 60 to the vehicle frame via its pivot sleeves.

[0022] Specifically, the pivot sleeve 21 is a plastic pivot sleeve. Function: Plastic pivot sleeves (such as those made of high-molecular engineering plastics) have good impact resistance and self-lubrication, higher reliability, longer service life, and certain cushioning performance.

[0023] Specifically, the balance beam frame 11 has a swing groove 15 inside, and the bottom of the swing groove 15 has a slot 16. The balance beam mounting assembly 50 is located inside the swing groove 15. The middle of the balance beam mounting assembly 50 is hinged to the middle of the swing groove 15 through a shock-absorbing device 52. The left and right ends of the balance beam mounting assembly 50 pass through the slot 16 and are located on the outer sides of the left and right ends of the swing groove 15, respectively. Two elastic limiting devices 40 are respectively set at the bottom edges of the two frame side plates 12. Function: The swing groove 15 facilitates the hinge between the balance beam frame 11 and the balance beam mounting assembly 50 through the shock-absorbing device 52, thereby realizing the up-and-down swing of the balance beam mounting assembly 50. During the up-and-down swing of the balance beam mounting assembly 50, the upward swinging end of the balance beam mounting assembly 50 will form an elastic engagement with the elastic limiting device 40 at the bottom edge of the corresponding frame side plate 12.

[0024] Specifically, the balance beam 11, the swing groove 15, and the slot 16 are recessed downwards in the middle, and the left and right ends of the balance beam 11, the swing groove 15, and the slot 16 are inclined upwards towards the two side plates 12 of the frame, respectively. Function: This arrangement can reduce interference with the frame and make the up-and-down swing of the balance beam mounting assembly 50 smoother.

[0025] Specifically, the balance beam mounting assembly 50 includes a balance beam 51, a damping device 52, and a pin assembly 54. The balance beam 51 extends horizontally, and the damping device 52 is fitted into the middle mounting hole of the balance beam 51. The damping device 52 is sleeved on the outside of the pin assembly 54, and the pin assembly 54 extends axially forward and backward. The pin assembly 54 is located in the middle of the swing groove 15, and its front and rear ends are respectively installed and engaged with the front and rear side walls of the swing groove 15. Function: The balance beam 51 can swing up and down around the pin assembly 54 to a certain extent. During the up and down swing of the balance beam, the damping device 52 can dampen vibrations, and the upward swinging end of the balance beam can form an elastic engagement with the elastic limiting device 40 to further achieve buffering.

[0026] Specifically, the balance beam mounting assembly 50 also includes bushings 53. Bushings 53 are fitted onto the front and rear ends of the pin assembly 54, respectively. The front and rear ends of the pin assembly 54 are respectively fitted into the front and rear side walls of the swing groove 15 via the bushings 53. Function: The bushings 53 provide support and protection for the pin assembly 54.

[0027] Specifically, the damping device 52 includes an outer steel sleeve 521, a damping elastomer 522, and an inner steel sleeve 523. The inner steel sleeve 523 is disposed inside the outer steel sleeve 521, and the damping elastomer 522 is disposed between the outer steel sleeve 521 and the inner steel sleeve 523. The outer steel sleeve 521 mates with the intermediate mounting hole of the balance beam 51, and the inner steel sleeve 523 is fitted onto the outside of the pin assembly 54. Function: The damping elastomer, disposed between the outer and inner steel sleeves, can be glued together to form an assembly, thereby facilitating the rotation of the balance beam 51 around the pin assembly 54, and providing a damping effect.

[0028] Specifically, the elastic limiting device 40 includes a mounting plate 41 and a limiting elastic body 42. The limiting elastic body 42 is located at the bottom of the mounting plate 41 and has a variable cross-section structure in the height direction. The two mounting plates 41 are respectively installed on the bottom edges of the two frame side plates 12. The end of the balance beam 51 can elastically engage with the limiting elastic body 42 upwards. The left and right ends of the balance beam 51 are respectively hinged to the left frame 30 and the right frame 60 via hinge shafts 70, which extend axially along the front and rear. Function: The limiting elastic body can be glued to the mounting plate with mounting holes. The limiting elastic body has a variable cross-section design in the height direction (variable stiffness; the closer the balance beam is to the frame, the greater the limiting stiffness / force). The two ends of the balance beam 51 extend outwards beyond the bottom of the two frame side plates 12 and are respectively hinged to the hinge shafts 70 on the left frame 30 and the right frame 60, thereby facilitating the balance beam 51 to achieve overall balance and shock absorption by swinging up and down. See [reference needed]. Figure 1 (Note: Figure 1 The left side panel 12 of the frame and the balance beam 11 are shown in dashed lines to allow observation of the covered balance beam mounting assembly 50.

[0029] This utility model also provides an engineering machinery, including a main body of the engineering machinery and an elastic suspension structure according to any of the above-mentioned technical solutions, wherein the elastic suspension structure is installed on the main body of the engineering machinery. Application: The elastic suspension structure of this utility model can be applied to engineering machinery such as electric bulldozers and oil-powered bulldozers.

[0030] In summary, the improvement results are as follows: 1. The balance beam, through shock absorption devices and elastic limiting devices, isolates or reduces the vibration transmitted from the track to the chassis. This is the main shock absorption device of the whole machine, which improves the overall comfort of the vehicle and the reliability of the three electric components installed on the chassis.

[0031] 2. The pivot bushing is made of high-molecular engineering plastic, which has good impact resistance and self-lubrication, higher reliability, longer service life, and certain cushioning performance.

[0032] 3. It has a simple structure, low cost, and significant effect, making it suitable for widespread use.

[0033] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications are also considered to be within the protection scope of this utility model.

Claims

1. An elastic suspension structure, comprising a frame (10), characterized in that: The frame (10) includes two frame side plates (12) arranged left and right. The length of the two frame side plates (12) extends front and rear. The rear ends of the two frame side plates (12) are fixedly connected by a frame connecting plate (13). The front ends of the two frame side plates (12) are fixedly connected by a frame connecting rod (14). The front middle ends of the two frame side plates (12) are fixedly connected by a balance beam (11). The outer sides of the rear middle ends of the two frame side plates (12) are respectively provided with pivot mounting assemblies (20). The outer sides of the two frame side plates (12) are respectively provided with a left frame (30) and a right frame (60). The length of the left frame (30) and the right frame (60) extends front and rear. The rear end of the left frame (30) and the right frame (60) are respectively provided with pivot mounting assemblies (20). The rear end of the right frame (60) is hinged to the adjacent frame side plate (12) via the pivot mounting assembly (20), the axis of which extends left and right; a balance beam mounting assembly (50) is provided below the balance beam frame (11), the length of which extends left and right, the middle of the balance beam mounting assembly (50) is hinged to the middle of the balance beam frame (11) via a shock-absorbing device (52), the left and right ends of the balance beam mounting assembly (50) are respectively provided with elastic limiting devices (40) between the bottom edges of the two frame side plates (12) for elastic limiting cooperation, the left and right ends of the balance beam mounting assembly (50) are respectively hinged to the left frame (30) and the right frame (60).

2. The elastic suspension structure according to claim 1, characterized in that: The rear end of the left platform (30), the rear end of the right platform (60), and the adjacent pivot mounting assembly (20) are hinged by a pivot sleeve (21), which extends axially to the left and right.

3. The elastic suspension structure according to claim 2, characterized in that: The pivot sleeve (21) is a plastic pivot sleeve.

4. The elastic suspension structure according to any one of claims 1 to 3, characterized in that: The balance beam frame (11) has a swing groove (15) inside, and the bottom of the swing groove (15) has a slot (16). The balance beam mounting assembly (50) is located inside the swing groove (15). The middle of the balance beam mounting assembly (50) is hinged to the middle of the swing groove (15) through the shock absorption device (52). The left and right ends of the balance beam mounting assembly (50) pass through the slot (16) and are located on the outside of the left and right ends of the swing groove (15) respectively. The two elastic limiting devices (40) are respectively set on the bottom edge of the two frame side plates (12).

5. The elastic suspension structure according to claim 4, characterized in that: The middle of the balance beam (11), the swing groove (15), and the slot (16) is recessed downwards, and the left and right ends of the balance beam (11), the swing groove (15), and the slot (16) are inclined upwards towards the two side plates (12) of the vehicle frame, respectively.

6. The elastic suspension structure according to claim 4, characterized in that: The balance beam mounting assembly (50) includes a balance beam (51), the damping device (52), and a pin assembly (54). The balance beam (51) extends horizontally, and the damping device (52) is installed in the middle mounting hole of the balance beam (51). The damping device (52) is sleeved on the outside of the pin assembly (54), and the pin assembly (54) extends axially forward and backward. The pin assembly (54) is located in the middle of the swing groove (15), and the front and rear ends of the pin assembly (54) are respectively installed and engaged with the front and rear side walls of the swing groove (15).

7. The elastic suspension structure according to claim 6, characterized in that: The balance beam mounting assembly (50) also includes bushings (53), and the bushings (53) are respectively fitted on the front and rear ends of the pin assembly (54). The front and rear ends of the pin assembly (54) are respectively installed and cooperated with the front and rear side walls of the swing groove (15) through the bushings (53).

8. The elastic suspension structure according to claim 6, characterized in that: The shock-absorbing device (52) includes an outer steel sleeve (521), a shock-absorbing elastomer (522), and an inner steel sleeve (523). The inner steel sleeve (523) is disposed inside the outer steel sleeve (521), the shock-absorbing elastomer (522) is disposed between the outer steel sleeve (521) and the inner steel sleeve (523), the outer steel sleeve (521) is fitted with the middle mounting hole of the balance beam (51), and the inner steel sleeve (523) is sleeved on the outside of the pin assembly (54).

9. The elastic suspension structure according to any one of claims 6 to 8, characterized in that: The elastic limiting device (40) includes a mounting plate (41) and a limiting elastic body (42). The limiting elastic body (42) is disposed at the bottom of the mounting plate (41). The height direction of the limiting elastic body (42) is a variable cross-section structure. The two mounting plates (41) are respectively installed on the bottom edges of the two frame side plates (12). The end of the balance beam (51) can elastically cooperate with the limiting elastic body (42) upward. The left and right ends of the balance beam (51) are respectively hinged to the left frame (30) and the right frame (60) through a hinge shaft (70). The axial direction of the hinge shaft (70) extends forward and backward.

10. An engineering machinery, comprising an engineering machinery body, characterized in that: It also includes the elastic suspension structure according to any one of claims 1 to 9, wherein the elastic suspension structure is disposed on the body of the engineering machinery.

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