A three-point hydraulic linkage implement

Abstract

The application discloses a three-type hydraulic suspension working device, and the agricultural machine is hung on quick hanging joints at the end of an upper pull rod assembly and the end of two lower pull rod assemblies, and three quick hanging joint points keep the stability of the agricultural machine. The whole suspension working device is supplied with oil by a hydraulic pump to hydraulic cylinders on both sides, the hydraulic cylinders are extended or retracted to drive lifting rocker arms on both sides to rotate around two end hinge points of a rocker arm support, the lifting rocker arms rotate to drive lifting rod assemblies at both ends, and the lifting rod assemblies drive the lower pull rod assemblies to complete the lifting process. In actual operation, the left and right swinging of the lower pull rod assemblies is limited by a stabilizing rod assembly. The three-type hydraulic suspension working device provided by the application meets the requirements of GB / T 1593-2015 in lifting performance, power lifting range and other indexes.

Description

Technical Field

[0001] This invention relates to a type III hydraulic suspension working device, belonging to the technical field of agricultural machinery suspension mechanisms. Background Technology

[0002] With the upgrading of tractor horsepower and the development of new platforms, it is necessary to match suspension working devices of the corresponding horsepower category. Among them, the power output shaft power at the engine rated speed between 60-185kW requires a Class III suspension working device. To meet the parameter requirements of the Class III suspension working device, the upper suspension point, lower suspension point, and rod length of the suspension working device need to be redesigned.

[0003] If the hinge point coordinates are arranged arbitrarily or the length of the rod is not designed properly, it will lead to low lifting efficiency, lifting stroke not meeting national standards, and poor lifting stability.

[0004] Overcoming the above technical problems and designing a suspension structure that meets national standards is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] Objective: In order to overcome the shortcomings of the existing technology, the present invention provides three types of hydraulic suspension working devices, which aim at lifting range, lifting force and lifting speed ratio, and optimize the matching of hinge point position and length of each rod, including the shape optimization of hinge point installation structure, so as to achieve good performance requirements.

[0006] Technical solution: To solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0007] A type III hydraulic suspension working device includes: a central transmission housing, a rocker arm support is provided on the top of the central transmission housing, a rotating shaft is provided inside the rocker arm support, and the two ends of the rotating shaft are respectively connected to one end of the lifting rocker arm.

[0008] The middle part of the lifting rocker arm is rotatably connected to the piston rod of the hydraulic cylinder.

[0009] The free end of the lifting rocker arm is rotatably connected to one end of the lifting rod assembly.

[0010] Side supports are provided on both sides of the central transmission housing, and the bottom of the hydraulic cylinder is rotatably connected to the side supports.

[0011] The side support is also rotatably connected to one end of the pull rod assembly.

[0012] The middle part of the pull-down rod assembly is rotatably connected to the other end of the lifting rod assembly.

[0013] The central transmission housing is further provided with half-shaft housings on both sides, and a stabilizer bar mounting seat is provided at the bottom of the half-shaft housing. The free end of the stabilizer bar mounting seat is rotatably connected to one end of the stabilizer bar assembly.

[0014] The other end of the stabilizer bar assembly is rotatably connected to the side of the pull-down rod assembly.

[0015] The front end of the central transmission housing is provided with an upper pull rod support, which is rotatably connected to one end of the upper pull rod assembly.

[0016] The rocker arm support is provided with a hook fixing plate, and the upper pull rod assembly is provided with a hook. The free end of the hook is detachably connected to the free end of the hook fixing plate.

[0017] Both the upper and lower pull rod assemblies are equipped with quick-connect couplings at their free ends.

[0018] Furthermore, the vertical center axis of the central transmission housing is coaxial with the vertical center axis of the rocker arm support, and the lifting rocker arms at both ends of the rotating shaft are symmetrically arranged along the vertical center axis of the rocker arm support.

[0019] Furthermore, the lifting rocker arm has a mounting hole in the middle, which is connected to the front end of the piston rod of the hydraulic cylinder via a pin.

[0020] Furthermore, the free end of the lifting rocker arm is provided with a mounting hole, which is connected to a steel ball at one end of the lifting rod assembly via a pin.

[0021] Furthermore, the bottom of the hydraulic cylinder is connected to the upper support of the side support via a pin.

[0022] Furthermore, the lower support of the side support is connected to a steel ball at one end of the pull rod assembly via a pin.

[0023] Furthermore, the free end of the stabilizer bar mounting base is connected to the steel ball at one end of the stabilizer bar assembly via a pin.

[0024] Furthermore, the vertical center axis of the upper pull rod support is coaxial with the vertical center axis of the rocker arm support, and the upper pull rod support and the steel ball at one end of the upper pull rod assembly are connected by a pin.

[0025] Furthermore, bending baffles are also provided on both sides of the central transmission housing.

[0026] Furthermore, the rocker arm support includes: a bracket and a sleeve. The sleeve has brackets symmetrically arranged at its bottom sides, and the brackets are used to connect to the top of the central transmission housing. The front end of the sleeve has a mounting hole for a fixing plate, used for mounting a hook fixing plate. A rotating shaft is fitted inside the sleeve.

[0027] Furthermore, the distance between the hinge points of the front and rear ends of the lifting rocker arm is 385±2mm, the distance between the hinge point of the front end of the lifting rocker arm and the piston rod of the hydraulic cylinder is 184±2mm, and the distance between the hinge points of the lifting rocker arm and the hydraulic cylinder and the hinge points of the lifting rocker arm and the lifting rod assembly is 245±2mm. The distance between the hinge points at both ends of the lifting rod assembly is 848mm, and the length of the screw section is adjustable by ±30mm. The distance between the hinge points of the front and rear ends of the upper pull rod assembly is 717mm, and the length of the screw section is adjustable by ±30mm. The distance between the hinge points of the front and rear ends of the lower pull rod assembly is 997~1030mm. The distance between the hinge point of the front end of the lower pull rod assembly and the hinge point in the middle of the lifting rod assembly and the lower pull rod assembly is 590~620mm.

[0028] Furthermore, the distance between the front hinge point of the stabilizer bar assembly and the front hinge point of the pull rod assembly is 300±10mm, the distance between the front hinge points of the two pull rod assemblies is 486-500mm, the distance between the rear hinge points of the two pull rod assemblies is 1010mm, and the stabilizer bar can float left and right by 250mm. The distance between the front hinge points of the two lifting rocker arms is 550±10mm, the distance between the rear hinge points of the two lifting rocker arms is 637±5mm, and the distance between the bottom hinge points of the two hydraulic cylinders is 550±10mm.

[0029] Furthermore, the distance between the front and rear hinge points of the lifting rocker arm is 385mm, the distance between the front hinge point of the lifting rocker arm and the hydraulic cylinder piston rod is 184mm, and the distance between the hinge point of the lifting rocker arm and the hydraulic cylinder and the hinge point of the lifting rocker arm and lifting rod assembly is 245mm. The distance between the hinge points at both ends of the lifting rod assembly is 848mm. The distance between the front and rear hinge points of the upper pull rod assembly is 717mm. The distance between the front and rear hinge points of the lower pull rod assembly is 997mm. The distance between the front hinge point of the lower pull rod assembly and the middle hinge point of the lifting rod assembly and lower pull rod assembly is 590mm.

[0030] Furthermore, the distance between the front hinge point of the stabilizer bar assembly and the front hinge point of the pull rod assembly is 300mm, the distance between the front hinge points of the two pull rod assemblies is 486mm, the distance between the rear hinge points of the two pull rod assemblies is 1010mm, the distance between the front hinge points of the two lifting rocker arms is 550mm, the distance between the rear hinge points of the two lifting rocker arms is 637mm, and the distance between the bottom hinge points of the two hydraulic cylinders is 550mm.

[0031] Beneficial Effects: This invention provides a three-point hydraulic suspension working device, which features a simple design and aesthetically pleasing and rational structural layout. Powered by hydraulic pressure, this device is used in conjunction with agricultural machinery for field operations. During use, its lifting performance, power lifting range, and other indicators all meet the requirements of GB / T1593-2015. Its advantages are as follows:

[0032] 1. The hinge point location and the length of each rod are reasonable, resulting in a large lifting force, high lifting efficiency, and stable lifting process.

[0033] 2. The mounting points of the hydraulic cylinder and pull rod are cast together with the housing, resulting in a small space occupation, low processing cost, and high reliability. The rocker arm support, while ensuring connection strength, features a hollow design at the bottom, facilitating the installation and disassembly of the housing cover bolts and hydraulic lines, thus providing excellent maintainability.

[0034] 3. A bending baffle has been added to the rear end of the housing to reduce the swing amplitude and impact force of the pull rod, providing double protection and improving the reliability of the pull rod. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of the present invention.

[0036] Figure 2 A schematic diagram of the rocker arm and rocker arm support structure.

[0037] Figure 3 A schematic diagram of the connection structure between the rocker arm and the hydraulic cylinder.

[0038] Figure 4 This is a schematic diagram of the connection structure between the lifting arm and the lifting rod assembly.

[0039] Figure 5 This is a schematic diagram of the rocker arm support.

[0040] Figure 6 This is a schematic diagram of the side support structure.

[0041] Figure 7 A layout diagram showing the coordinates of the hinge point and the length of the member projected onto the central plane.

[0042] Figure 8 This is a schematic diagram of the performance calculation program software interface.

[0043] Figure 9 A schematic diagram illustrating the result of lifting force.

[0044] Figure 10 A schematic diagram showing the results of increasing the speed ratio.

[0045] Figure 11 A schematic diagram showing the horizontal convergence distance of the pull rod assembly.

[0046] Figure 12 A schematic diagram of the spatial distance structure for the tie rod arrangement.

[0047] Reference numerals: 1. Central drive housing; 2. Rocker arm support; 3. Hydraulic cylinder; 4. Lifting rocker arm; 5. Upper pull rod assembly; 6. Lifting rod assembly; 7. Stabilizer bar mounting seat; 8. Baffle; 9. Stabilizer bar assembly; 10. Lower pull rod assembly; 11. Half shaft housing; 12. Hook; 13. Hook fixing plate; 14. Rotating shaft; 15. Side support; 16. Upper pull rod support; 17. Quick-connect coupling. Implementation

[0048] The present invention will be further described below with reference to specific embodiments.

[0049] like Figure 1 As shown, a type III hydraulic suspension working device includes: two hydraulic cylinders 3, two lifting rocker arms 4, one upper pull rod assembly 5, two lifting rod assemblies 6, two stabilizer bar mounting seats 7, two stabilizer bar assemblies 9, and two lower pull rod assemblies 10.

[0050] The rocker arm support 2 is installed on the top of the central transmission housing 1, such as Figure 2 As shown, the rocker arm support 2 is provided with a rotating shaft 14, and the two ends of the rotating shaft 14 are respectively connected to one end of the lifting rocker arm 4 through splines.

[0051] In one embodiment, the vertical center axis of the central transmission housing 1 is coaxial with the vertical center axis of the rocker arm support 2, and the lifting rocker arms 4 at both ends of the rotating shaft 14 are symmetrically arranged along the vertical center axis of the rocker arm support 2.

[0052] like Figure 3 As shown, the middle part of the lifting rocker arm 4 is rotatably connected to the piston rod 301 of the hydraulic cylinder 3.

[0053] In one embodiment, a mounting hole is provided in the middle of the lifting rocker arm 4, and the mounting hole is connected to the front end of the piston rod 301 of the hydraulic cylinder 3 through a pin 401.

[0054] like Figure 4 As shown, the free end of the lifting rocker arm 4 is rotatably connected to one end of the lifting rod assembly 6.

[0055] In one embodiment, the free end of the lifting rocker arm 4 is provided with a mounting hole, which is connected to a steel ball 601 at one end of the lifting rod assembly 6 via a pin 402.

[0056] Side supports 15 are provided on both sides of the central transmission housing 1, and the bottom of the hydraulic cylinder 3 is rotatably connected to the side supports 15.

[0057] In one embodiment, the bottom of the hydraulic cylinder 3 is connected to the upper support 1501 of the side support 15 via a pin.

[0058] The side support 15 is also rotatably connected to one end of the pull rod assembly 10.

[0059] In one embodiment, the lower support 1502 of the side support 15 is connected to a steel ball at one end of the pull rod assembly 10 via a pin.

[0060] The middle part of the pull-down rod assembly 10 is rotatably connected to the other end of the lifting rod assembly 6.

[0061] The central transmission housing 1 is also provided with half-shaft housings 11 on both sides, and a stabilizer rod mounting seat 7 is provided at the bottom of the half-shaft housing 11. The free end of the stabilizer rod mounting seat 7 is rotatably connected to one end of the stabilizer rod assembly 9.

[0062] In one embodiment, the free end of the stabilizer bar mount 7 is connected to a steel ball at one end of the stabilizer bar assembly 9 via a pin.

[0063] The other end of the stabilizer bar assembly 9 is rotatably connected to the side of the pull-down rod assembly 10.

[0064] The front end of the central transmission housing 1 is provided with an upper pull rod support 16, which is rotatably connected to one end of the upper pull rod assembly 5.

[0065] In one embodiment, the vertical center axis of the upper pull rod support 16 is coaxial with the vertical center axis of the rocker arm support 2; the upper pull rod support 16 is connected to the steel ball at one end of the upper pull rod assembly 5 by a pin.

[0066] The rocker arm support 2 is provided with a hook fixing plate 13, and the upper pull rod assembly 5 is provided with a hook 12. The free end of the hook 12 is detachably connected to the free end of the hook fixing plate 13.

[0067] Both the upper pull rod assembly 5 and the lower pull rod assembly 10 are equipped with quick-connect couplings 17 at their free ends.

[0068] Furthermore, the central transmission housing 1 is also provided with bending baffles 8 on both sides to reduce the swing amplitude of the pull rod assembly 10 and the impact force on the stabilizer support 7.

[0069] Furthermore, such as Figure 5 As shown, the rocker arm support 2 includes: a bracket 201 and a sleeve 202. The brackets 201 are symmetrically arranged on both sides of the bottom of the sleeve 202, and are used to connect to the top of the central transmission housing 1. The front end of the sleeve 202 is provided with a fixing plate mounting hole 203 for connecting to one end of the hook fixing plate 13. A rotating shaft 14 is sleeved inside the sleeve 202.

[0070] Furthermore, such as Figure 6 As shown, the upper part of the free end of the side support 15 is provided with an upper support 1501, and the lower part is provided with a lower support 1502.

[0071] Furthermore, the distance between the front and rear hinge points of the lifting rocker arm 4 is 385±2mm, the distance between the front hinge point of the lifting rocker arm 4 and the piston rod of the hydraulic cylinder 3 is 184±2mm, and the distance between the hinge point of the lifting rocker arm 4 and the hydraulic cylinder 3 and the hinge point of the lifting rocker arm 4 and the lifting rod assembly 6 is 245±2mm. The distance between the hinge points at both ends of the lifting rod assembly 6 is 848mm, and the length of the screw section is adjustable by ±30mm. The distance between the front and rear hinge points of the upper pull rod assembly 5 is 717mm, and the length of the screw section is adjustable by ±30mm. The distance between the front and rear hinge points of the lower pull rod assembly 10 is 997~1030mm. The distance between the front hinge point of the lower pull rod assembly 10 and the hinge point of the lifting rod assembly 6 and the middle hinge point of the lower pull rod assembly 10 is 590~620mm.

[0072] Furthermore, the distance between the front and rear hinge points of the lifting rocker arm is 385mm, the distance between the front hinge point of the lifting rocker arm and the hydraulic cylinder piston rod is 184mm, and the distance between the hinge point of the lifting rocker arm and the hydraulic cylinder and the hinge point of the lifting rocker arm and lifting rod assembly is 245mm. The distance between the hinge points at both ends of the lifting rod assembly is 848mm. The distance between the front and rear hinge points of the upper pull rod assembly is 717mm. The distance between the front and rear hinge points of the lower pull rod assembly is 997mm. The distance between the front hinge point of the lower pull rod assembly and the middle hinge point of the lifting rod assembly and lower pull rod assembly is 590mm.

[0073] Furthermore, the distance between the front hinge point of the stabilizer bar assembly and the front hinge point of the pull rod assembly is 300±10mm, the distance between the front hinge points of the two pull rod assemblies is 486-500mm, the distance between the rear hinge points of the two pull rod assemblies is 1010mm, and the stabilizer bar can float left and right by 250mm. The distance between the front hinge points of the two lifting rocker arms is 550±10mm, the distance between the rear hinge points of the two lifting rocker arms is 637±5mm, and the distance between the bottom hinge points of the two hydraulic cylinders is 550±10mm. Example

[0074] A type III hydraulic suspension working device is disclosed. In use, agricultural implements are attached to quick-connect couplings 17 at the ends of the upper pull rod assembly 5 and the two lower pull rod assemblies 10. These three quick-connect couplings maintain the stability of the implements. The entire suspension working device is powered by a hydraulic pump supplying oil to hydraulic cylinders 3 on both sides. The extension and retraction of the hydraulic cylinders 3 drive the lifting rocker arms 4 on both sides to rotate around the hinge points at both ends of the rocker arm supports 2. The rotation of the lifting rocker arms 4 drives the lifting rod assemblies 6 at both ends, which in turn drive the lower pull rod assemblies 10 to complete the lifting process. In actual operation, a stabilizer bar assembly 9 limits the left and right swaying of the lower pull rod assemblies 10.

[0075] In addition, when the three rods, namely the upper pull rod assembly 5, the lifting rod assembly 6, and the lower pull rod assembly 10, are connected to the pin shaft, their heads are equipped with steel balls, which facilitates the 360° swing of the three rods and makes it easier to attach agricultural implements of different widths. Example

[0076] The design and implementation process of a type III hydraulic suspension working device requires first determining the coordinate position of the hinge point and the length of each rod. After verifying the lifting force and various parameters of lifting performance, the detailed design stage of the components can then begin.

[0077] The coordinates of the hinge points and the lengths of each member are determined as follows: The entire lifting process of this working device involves vertical movement within a plane. The left and right lifting rocker arms 4, lifting rod assembly 6, and pull rod assembly 10 are symmetrical about the central plane of the central transmission housing 1. Therefore, the three-dimensional coordinates of each hinge point can be projected onto the central plane of the housing to simplify the calculation. For example... Figure 7 As shown, with the center of the half-shaft housing as the reference point, points O, A, and B represent three connection points of the lifting rocker arm 4. Point O is the rotation point between the lifting rocker arm 4 and the rocker arm support 2; point A is the rotation point between the lifting rocker arm 4 and the piston rod of the hydraulic cylinder 3; and point B is the rotation point between the lifting rocker arm 4 and the lifting rod assembly 6. Point N is the rotation point between the upper pull rod assembly 5 and the upper pull rod support of the central transmission housing 1. Point M is the rotation point between the hydraulic cylinder 3 and the upper support 1501 of the side support 15 of the central transmission housing 1; point P is the rotation point between the lower pull rod assembly 10 and the lower support 1502 of the side support 15 of the central transmission housing 1; and point C is the rotation point between the other end of the lifting rod assembly 6 and the middle of the lower pull rod assembly 10. Point E is the connection point of the quick-connect joint 17 of the upper pull rod assembly 5, and point D is the connection point of the quick-connect joint 17 of the lower pull rod assembly (also known as the lower suspension point).

[0078] When initially setting the coordinates of each point and the length of the rod, reference was first made to industry models of the same horsepower range, and then adjustments were made according to the actual structural layout of the vehicle model. Based on the kinematic equations, a calculation program developed in Matlab was used to calculate parameters such as lifting force and lifting speed ratio.

[0079] The detailed values ​​for coordinates and rod lengths are shown in Table 1:

[0080] Table 1 shows the coordinates of the hinge points and the lengths of each member.

[0081]

[0082] like Figure 8 As shown, inputting the numerical values ​​into the calculation program will calculate the lifting force. Figure 9 As shown, increase the speed ratio, as Figure 10 As shown.

[0083] Other performance parameters were calculated, such as lifting stroke of 791mm, lowest suspension point of 230mm, distance between the lower rod suspension point D and the end of the PTO power output shaft of 670mm, transport height of 1021mm, and lifting force of 4000kg.

[0084] The vertical convergence distance is 3588mm, such as Figure 5 DO'. (e.g.) Figure 11 As shown, the horizontal convergence distance is 1922mm and the convergence angle is 29°. All indicators meet the Class 3 suspension standards and can be used on tractors with a horsepower of about 160 and a wheelbase of about 2700mm. It has leading lifting capacity and good stability in the same horsepower range in the industry. Example

[0085] Using planar coordinates and the planar lengths of the members as design datum, the three-dimensional assembly relationships of each member are designed, such as... Figure 12 As shown, the distance between the front hinge point of the stabilizer bar assembly 9 and the front hinge point of the pull rod assembly 10 is 300mm, the distance between the front hinge points of the two pull rod assemblies 10 is 486mm, the distance between the rear hinge points of the two pull rod assemblies 10 is 1010mm, the distance between the front hinge points of the two lifting rocker arms 4 is 550mm, the distance between the rear hinge points of the two lifting rocker arms 4 is 637mm, and the distance between the bottom hinge points of the two hydraulic cylinders 3 is 550mm.

[0086] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A type III hydraulic suspension working device, characterized in that: include: A central transmission housing, the top of which is provided with a rocker arm support, and a rotating shaft is provided inside the rocker arm support, with both ends of the rotating shaft connected to one end of the lifting rocker arm respectively; The middle part of the lifting rocker arm is rotatably connected to the piston rod of the hydraulic cylinder; The free end of the lifting rocker arm is rotatably connected to one end of the lifting rod assembly; Side supports are provided on both sides of the central transmission housing, and the bottom of the hydraulic cylinder is rotatably connected to the side supports. The side support is also rotatably connected to one end of the pull rod assembly; The middle part of the pull-down rod assembly is rotatably connected to the other end of the lifting rod assembly; The central transmission housing is also provided with half-shaft housings on both sides, and a stabilizer bar mounting seat is provided at the bottom of the half-shaft housing. The free end of the stabilizer bar mounting seat is rotatably connected to one end of the stabilizer bar assembly. The other end of the stabilizer bar assembly is rotatably connected to the side of the pull-down rod assembly; The front end of the central transmission housing is provided with an upper pull rod support, which is rotatably connected to one end of the upper pull rod assembly. The rocker arm support is provided with a hook fixing plate, the upper pull rod assembly is provided with a hook, and the free end of the hook is detachably connected to the free end of the hook fixing plate; Both the upper and lower tie rod assemblies are equipped with quick-connect couplings at their free ends. The vertical center axis of the central transmission housing is coaxial with the vertical center axis of the rocker arm support, and the lifting rocker arms at both ends of the rotating shaft are symmetrically arranged along the vertical center axis of the rocker arm support. The lifting rocker arm has a mounting hole in the middle, which is connected to the front end of the piston rod of the hydraulic cylinder by a pin. The free end of the lifting rocker arm is provided with a mounting hole, which is connected to a steel ball at one end of the lifting rod assembly via a pin. The distance between the front and rear hinge points of the lifting rocker arm is 385±2mm; the distance between the front hinge point of the lifting rocker arm and the hydraulic cylinder piston rod is 184±2mm; the distance between the hinge point of the lifting rocker arm and the hydraulic cylinder and the hinge point of the lifting rocker arm and the lifting rod assembly is 245±2mm; the distance between the hinge points at both ends of the lifting rod assembly is 848mm±30mm; the distance between the front and rear hinge points of the upper pull rod assembly is 717mm±30mm; the distance between the front and rear hinge points of the lower pull rod assembly is 997~1030mm; the distance between the front hinge point of the lower pull rod assembly and the middle hinge point of the lifting rod assembly and the lower pull rod assembly is 590~620mm. The distance between the front hinge point of the stabilizer bar assembly and the front hinge point of the pull rod assembly is 300±10mm, the distance between the front hinge points of the two pull rod assemblies is 486~500mm, and the distance between the rear hinge points of the two pull rod assemblies is 1010mm±250mm; the distance between the front hinge points of the two lifting rocker arms is 550±10mm, the distance between the rear hinge points of the two lifting rocker arms is 637±5mm, and the distance between the bottom hinge points of the two hydraulic cylinders is 550±10mm.

2. The three types of hydraulic suspension working device according to claim 1, characterized in that: The bottom of the hydraulic cylinder is connected to the upper support of the side support by a pin.

3. The three types of hydraulic suspension working device according to claim 1, characterized in that: The lower support of the side support is connected to a steel ball at one end of the pull rod assembly via a pin.

4. A type III hydraulic suspension working device according to claim 1, characterized in that: The free end of the stabilizer bar mounting base is connected to the steel ball at one end of the stabilizer bar assembly via a pin.

5. A type III hydraulic suspension working device according to claim 1, characterized in that: The vertical center axis of the upper tie rod support is the same as the vertical center axis of the rocker arm support, and the upper tie rod support and the steel ball at one end of the upper tie rod assembly are connected by a pin.

6. A type III hydraulic suspension working device according to claim 1, characterized in that: The central transmission housing is also equipped with bending baffles on both sides.

7. A type III hydraulic suspension working device according to claim 1, characterized in that: The rocker arm support includes: a bracket and a sleeve; the bottom sides of the sleeve are symmetrically provided with brackets, which are used to connect to the top of the central transmission housing; the front end of the sleeve is provided with a fixing plate mounting hole for mounting a hook fixing plate; a rotating shaft is sleeved inside the sleeve.

8. A type III hydraulic suspension working device according to claim 1, characterized in that: The distance between the front and rear hinge points of the lifting rocker arm is 385mm; the distance between the front hinge point of the lifting rocker arm and the hydraulic cylinder piston rod is 184mm; the distance between the hinge point of the lifting rocker arm and the hydraulic cylinder and the hinge point of the lifting rocker arm and the lifting rod assembly is 245mm; the distance between the hinge points at both ends of the lifting rod assembly is 848mm; the distance between the front and rear hinge points of the upper pull rod assembly is 717mm; the distance between the front and rear hinge points of the lower pull rod assembly is 997mm; and the distance between the front hinge point of the lower pull rod assembly and the middle hinge point of the lifting rod assembly and the lower pull rod assembly is 590mm.

9. A type III hydraulic suspension working device according to claim 1, characterized in that: The distance between the front hinge point of the stabilizer bar assembly and the front hinge point of the pull rod assembly is 300mm, the distance between the front hinge points of the two pull rod assemblies is 486mm, the distance between the rear hinge points of the two pull rod assemblies is 1010mm, the distance between the front hinge points of the two lifting rocker arms is 550mm, the distance between the rear hinge points of the two lifting rocker arms is 637mm, and the distance between the bottom hinge points of the two hydraulic cylinders is 550mm.

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