High-drive SD series bulldozer swing frame lubricating pin shaft two-way press-fitting equipment

Abstract

The utility model discloses a high-drive SD series bulldozer swing frame lubrication pin shaft two-way press-fitting device which comprises an arch-shaped frame, a hanging ring, two oil cylinders and a hydraulic system, an opening of the arch-shaped frame faces downwards, the two ends of the arch-shaped frame are located on the two sides of a walking frame of a bulldozer respectively, the hanging ring is installed on the top of the arch-shaped frame and hung on a lifting hook of a crown block, and the hydraulic system is connected with the two oil cylinders. The two oil cylinders are coaxial and symmetrically installed on the inner sides of the two ends of the arch-shaped frame, piston rods of the two oil cylinders are opposite to pin holes, used for installing lubricating pin shafts, in the walking frame, and the hydraulic system is connected with the two oil cylinders through oil pipes. The two lubricating pin shafts are pressed into the pin holes in the swing frame and the walking frame at the same time through power provided by the oil cylinders on the left side and the right side of the arch-shaped frame, the swing frame and the walking frame are pressed together, the structure is simple, cost is low, operation is convenient and fast, the assembly process is greatly simplified, assembly efficiency and assembly quality are improved, and the production cost is reduced. And the assembly cost and the labor intensity of workers are reduced.

Description

Technical Field

[0001] This utility model relates to a bidirectional press-fitting device that presses together the front, middle, and rear swing frames and the walking frame of a high-drive bulldozer walking system using lubricated pins, belonging to the field of workshop equipment technology. Background Technology

[0002] The high-drive bulldozer's walking system consists of components such as the walking frame, drive sprockets, track rollers, idler wheels, carrier rollers, track tensioning devices, and track assemblies. There is one walking frame on each side, and each frame contains four sets of track rollers. These track rollers not only bear the entire weight of the bulldozer but also act as shock absorbers during movement. The four sets of track rollers are mounted on the front swing frame (one), middle swing frame (two), and rear swing frame (one). The four swing frames are connected to the walking frame via lubricated pins. The swing frames interact with the shock absorbers through their up-and-down movement, thus achieving a shock absorption effect. Each swing frame is connected to the walking frame on both the left and right sides via two lubricated pins. These lubricated pins act as a connection and lubrication point between the swing frames and the walking frame, ensuring smooth swinging of the swing frames around the pins. When actually pressing in the lubricated pins, it is necessary to ensure an interference fit between the lubricated pins and the walking frame and swing frames, while also ensuring that the self-lubricating bearing in the middle of the pin is not damaged, and also to allow for radial runout between the swing frames and the walking frame. The traditional press-fitting process involves first placing the left and right traveling frames flat with their lower surfaces facing upwards. Then, aligning the front swing frame (one), middle swing frame (two), and rear swing frame (one) with the corresponding holes on the traveling frames, and manually driving in eight lubrication pins one by one. This press-fitting method is extremely cumbersome, labor-intensive, and inefficient. Driving the pins in is difficult and unsafe, and manual driving can easily damage the bearings. Furthermore, due to the rigidity and springback of the components, assembly on the assembly line using ordinary tools often cannot achieve the pressure required for hydraulic presses, affecting the overall assembly quality. Therefore, improving the assembly efficiency and quality of the lubrication pins between the bulldozer's swing frames and traveling frames has been a persistent challenge for technical personnel. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a bidirectional press-fitting device for the lubrication pins of the SD series bulldozer swing frame, thereby improving the assembly efficiency and quality of the lubrication pins between the bulldozer swing frame and the traveling frame.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A bidirectional press-fitting device for lubrication pins on a high-drive SD series bulldozer swing frame includes an arched frame, a lifting ring, two hydraulic cylinders, and a hydraulic system. The arched frame has its opening facing downwards, and its two ends are located on both sides of the bulldozer's traveling frame. The lifting ring is installed on the top of the arched frame and hung on the hook of an overhead crane. The two hydraulic cylinders are coaxial with each other and symmetrically installed on the inner sides of both ends of the arched frame. The piston rods of the two hydraulic cylinders are opposite to the pin holes on the traveling frame used for installing lubrication pins. The hydraulic system is connected to the two hydraulic cylinders through oil pipes.

[0006] The aforementioned high-drive SD series bulldozer swing frame lubrication pin bidirectional press-fitting equipment also includes a hydraulic control box and a counterweight. The hydraulic control box and the counterweight are respectively installed on both sides of the bow-shaped frame, and the hydraulic system is installed inside the hydraulic control box.

[0007] The aforementioned high-drive SD series bulldozer swing frame lubrication pin bidirectional press-fitting equipment has a groove on the top of the counterweight block, and an adjustment block is placed in the groove.

[0008] The aforementioned high-drive SD series bulldozer swing frame lubrication pin bidirectional pressing equipment has a lifting ring installed on the top of the bow-shaped frame via an adjustable connecting mechanism. The adjustable connecting mechanism includes a strip-shaped lifting plate, an adjusting screw, a slider, and two pairs of diagonal arms. The lifting plate is horizontally fixed to the top of the bow-shaped frame, and a horizontal groove is provided at the tail end of the lifting plate. The slider is slidably installed in the horizontal groove. The adjusting screw is rotatably connected to the bow-shaped frame and threadedly engaged with the slider. A handwheel is installed at one end of the adjusting screw. The upper ends of the two pairs of diagonal arms are rotatably connected to the lifting ring. The lower ends of one pair of diagonal arms are rotatably connected to the head end of the lifting plate, and the lower ends of the other pair of diagonal arms are rotatably connected to the slider.

[0009] The aforementioned high-drive SD series bulldozer swing frame lubrication pin bidirectional press-fitting equipment has washers in the holes where the lifting ring connects to each inclined arm.

[0010] The aforementioned high-drive SD series bulldozer swing frame lubrication pin bidirectional press-fitting equipment has handles installed on both sides of the bow-shaped frame.

[0011] The aforementioned high-drive SD series bulldozer swing frame lubrication pin bidirectional press-fitting equipment includes a hydraulic system comprising an oil tank, an oil pump, a check valve, a directional valve, and a hydraulically controlled check valve. The oil pump's suction port is connected to the oil tank, and its outlet port is connected to the P port of the directional valve via the check valve. The directional valve's T port is connected to the oil tank, and its A port is connected to the rodless chambers of two cylinders via the hydraulically controlled check valve. The directional valve's B port is connected to the rod chambers of the two cylinders and the control port of the hydraulically controlled check valve.

[0012] The aforementioned high-drive SD series bulldozer swing frame lubrication pin bidirectional press-fitting equipment has an oil pump suction port connected to an oil tank via a filter.

[0013] The aforementioned high-drive SD series bulldozer swing frame lubrication pin bidirectional press-fitting equipment has an overflow valve installed at the oil pump outlet.

[0014] The aforementioned high-drive SD series bulldozer swing frame lubrication pin bidirectional press-fitting equipment has a pressure gauge installed on the oil pipe between the hydraulic control check valve and the oil cylinder.

[0015] This invention uses the power provided by the hydraulic cylinders on both sides of the bow-shaped frame to simultaneously press two lubrication pins into the pin holes on the swing frame and the traveling frame, thus press-fitting the swing frame and the traveling frame together. Its structure is simple, low-cost, and easy and quick to operate, which greatly simplifies the assembly process, improves assembly efficiency and quality, and reduces assembly costs and the labor intensity of workers. Attached Figure Description

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0017] Figure 1 This is an assembly diagram of the traveling frame, lubrication pins, and front, middle, and rear swing frames;

[0018] Figure 2 This is a schematic diagram of the structure of this utility model;

[0019] Figure 3 This is a magnified view of a portion of the slider and adjusting screw;

[0020] Figure 4 This is a schematic diagram illustrating the use of this utility model;

[0021] Figure 5 This is a schematic diagram of a hydraulic system.

[0022] The following are the labels in the diagram: 1. Walking frame; 2. Swing frame; 3. Lubrication pin; 4. Plug; 5. Retaining ring; 6. Lifting ring; 7. Diagonal arm; 8. Lifting plate; 9. Bow-shaped frame; 10. Handle; 11. Counterweight; 12. Hydraulic cylinder; 13. Washer ring; 14. Adjusting screw; 15. Sliding block; 16. Hydraulic control box; 17. Filter; 18. Oil pump; 19. Relief valve; 20. Check valve; 21. Directional valve; 22. Hydraulic control check valve; 23. Pressure gauge. Detailed Implementation

[0023] This utility model addresses the shortcomings of existing technologies by providing a bidirectional pressing device for the lubrication pin shaft of a high-drive bulldozer swing frame, thereby improving the assembly efficiency and quality of the entire bulldozer.

[0024] See Figures 1-5This utility model mainly includes a lifting ring 6, a diagonal arm 7, a lifting plate 8, an arched frame 9, a handle 10, a counterweight 11, a hydraulic cylinder 12, a washer 13, an adjusting screw 14, a slider 15, and a hydraulic control box 16. The hydraulic control box 16 is equipped with a hydraulic system.

[0025] The bow-shaped frame 9 has its opening facing downwards, and coaxial hydraulic cylinders 12 are symmetrically installed on the inner sides of both ends. A strip-shaped lifting plate 8 is horizontally fixed to the top of the bow-shaped frame 9 by bolts. A horizontal groove is provided at the tail end of the lifting plate 8, and a slider 15 is slidably installed within the groove. An adjusting screw 14 is rotatably connected to the bow-shaped frame 9 and threadedly engaged with the slider 15. A handwheel is installed at one end of the adjusting screw 14, allowing adjustment of the slider 15's position by rotating the bow-shaped frame 9. Four inclined arms 7 are divided into two pairs. The upper end of each pair of inclined arms 7 is rotatably connected to the lifting ring 6. The lower end of one pair of inclined arms 7 is rotatably connected to the head end of the lifting plate 8, and the lower end of the other pair of inclined arms 7 is rotatably connected to the slider 15. After the pressing equipment is lifted by the overhead crane, the position of the lifting ring 6 relative to the bow-shaped frame 9 can be changed by adjusting the position of the slider 15, thereby fine-tuning the inclination angle of the bow-shaped frame 9. Washers 13 are installed in the holes on both the front and rear sides of the lifting ring 6 that connect to each inclined arm 7.

[0026] The hydraulic control box 16 and the counterweight 11 are respectively installed on both sides of the bow frame 9. The top of the counterweight 11 is provided with a groove, and an adjustment block can be placed in the groove. By adding or removing the adjustment block, the center of gravity of the pressing equipment can be adjusted so that the opening of the bow frame 9 faces downward.

[0027] Handles 10 are installed on both sides of the bow-shaped frame 9 for adjusting the position and angle of the bow-shaped frame 9.

[0028] One end of the lubrication pin 3 is provided with a plug 4, and a retaining ring 5 is provided on the plug 4. The inner diameter of the retaining ring 5 is the same as the diameter of the piston rod of the oil cylinder 12. By fitting the retaining ring 5 onto the piston rod of the oil cylinder 12, the lubrication pin 3 can be detachably connected to the lubrication pin 3, so that the lubrication pin 3 can move together with the piston rod of the oil cylinder 12 and the two remain coaxial, which facilitates the press-fitting of the lubrication pin 3.

[0029] The hydraulic system includes an oil tank, a filter 17, an oil pump 18, a relief valve 19, a check valve 20, a directional valve 21, a pilot-operated check valve 22, a pressure gauge 23, and oil pipes. The oil pump 18's suction port is connected to the oil tank via the filter 17. The oil pump 18's outlet port is connected to the P port of the directional valve 21 via the check valve 20. The directional valve 21's T port is connected to the oil tank, and its A port is connected to the rodless chambers of the two cylinders 12 via the pilot-operated check valve 22. The directional valve 21's B port is connected to the rod chambers of the two cylinders 12 and the control port of the pilot-operated check valve 22. The pressure gauge 23 is installed on the high-pressure explosion-proof oil pipe between the pilot-operated check valve 22 and the cylinders 12. A relief valve 19 is installed between the oil pump 18's outlet port and the check valve 20 to adjust the working pressure of the cylinders 12.

[0030] The assembly process requirements for the traveling frame 1, the swing frame 2, and the lubrication pin 3 are: the radial runout of the traveling frame, the swing frame, and the lubrication pin ≤ 0.15mm. The hydraulic cylinder 12 can provide a pressure of approximately 10 to 20 tons.

[0031] The actual pressing process is as follows: First, place the traveling frame 1 with its lower surface facing upwards and stabilize it. Align the swing frame 2 with the corresponding hole of the traveling frame 1. Hook the crane hook onto the lifting ring 6 and lift the pressing equipment. Adjust the center of gravity of the pressing equipment by adjusting the weight of the adjusting block placed in the groove counterweight block 11, so that the opening of the bow frame 9 remains downward and without deviation. Use the crane to lift the pressing equipment directly above the pressing hole of the traveling frame 1. The worker adjusts the angle of the bow frame 9 through the four handles 10 on the left and right sides of the bow frame 9, so that the oil cylinder 12 is aligned with the pin hole. The position of the slider 15 relative to the bow frame 9 can be finely adjusted by rotating the adjusting screw 14, so that the oil cylinder 12 is precisely aligned with the pin hole. Four modulated circular washers 13 are welded on both sides of the lifting ring 6, which can reduce the friction between the lifting ring 6 and the inclined pull arm 7 during adjustment. When the axis of the two oil cylinders 12 is on the same axis as the axis of the pin hole, the lubrication pin 3 can be pressed. Align the lubrication pin 3 with the center of the hole, and operate the hydraulic system in the hydraulic control box 16. The hydraulic system connects the two cylinders 12 through explosion-proof oil pipes. During pressing, the components of the pressing equipment must be kept stable to ensure that the transverse center lines of the two cylinders, the transverse center lines of the swing frame pin holes, the transverse center lines of the traveling frame pin holes, and the center lines of the lubrication pins coincide. Start the motor, which drives the oil pump 18 to draw oil from the oil tank. The hydraulic oil in the tank passes through the oil pump 18 to the overflow valve 19. The oil coming out of the overflow valve 19 passes through the reversing valve 21 and enters the cylinders 12. The piston rods of both cylinders 12 extend simultaneously. By operating the reversing valve 21, the pistons of the cylinders are extended and retracted. While ensuring that the force on the left and right sides is uniform, the two lubrication pins on the left and right sides can be pressed simultaneously, greatly improving the pressing efficiency of the wheel lubrication pins. The hydraulic system of this pressing equipment is equipped with an overflow valve 19, which can accurately control the assembly pressure.

[0032] This invention uses the power provided by the hydraulic cylinders on both sides of the bow-shaped frame to simultaneously press two lubrication pins into the pin holes, thus press-fitting the swing frame and the traveling frame together. It features a simple structure, low cost, and convenient and quick operation, which greatly simplifies the assembly process, improves assembly efficiency and quality, and reduces assembly costs and the labor intensity of workers.

Claims

1. A bidirectional press-fitting device for the lubrication pin shaft of a high-drive SD series bulldozer swing frame, characterized in that, The device includes an arched frame (9), a lifting ring (6), two hydraulic cylinders (12), and a hydraulic system. The opening of the arched frame (9) faces downward, and the two ends of the arched frame (9) are located on both sides of the traveling frame (1) of the bulldozer. The lifting ring (6) is installed on the top of the arched frame (9) and hung on the hook of the overhead crane. The two hydraulic cylinders (12) are coaxial with each other and symmetrically installed on the inner sides of the two ends of the arched frame (9). The piston rods of the two hydraulic cylinders (12) are opposite to the pin holes on the traveling frame (1) for installing lubrication pins (3). The hydraulic system is connected to the two hydraulic cylinders (12) through oil pipes.

2. The bidirectional press-fitting device for lubrication pins of high-drive SD series bulldozer swing frames according to claim 1, characterized in that, It also includes a hydraulic control box (16) and a counterweight (11), which are respectively installed on both sides of the bow frame (9), and the hydraulic control box (16) is equipped with a hydraulic system.

3. The bidirectional press-fitting device for lubrication pins of high-drive SD series bulldozer swing frames according to claim 2, characterized in that, The top of the counterweight (11) is provided with a groove, and an adjustment block is placed in the groove.

4. The bidirectional press-fitting device for lubrication pins of high-drive SD series bulldozer swing frames according to claim 3, characterized in that, The lifting ring (6) is installed on the top of the bow frame (9) through an adjustable connecting mechanism. The adjustable connecting mechanism includes a strip-shaped lifting plate (8), an adjusting screw (14), a slider (15), and two pairs of diagonal arms (7). The lifting plate (8) is horizontally fixed on the top of the bow frame (9). A horizontal groove is provided at the tail end of the lifting plate (8). The slider (15) is slidably installed in the horizontal groove. The adjusting screw (14) is rotatably connected to the bow frame (9) and is threadedly engaged with the slider (15). A handwheel is installed at one end of the adjusting screw (14). The upper ends of the two pairs of diagonal arms (7) are rotatably connected to the lifting ring (6). The lower ends of one pair of diagonal arms (7) are rotatably connected to the head end of the lifting plate (8), and the lower ends of the other pair of diagonal arms (7) are rotatably connected to the slider (15).

5. The bidirectional press-fitting device for lubrication pins of high-drive SD series bulldozer swing frames according to claim 4, characterized in that, The holes connecting the lifting ring (6) to each of the inclined arms (7) are provided with washers (13).

6. The bidirectional press-fitting device for lubrication pins of high-drive SD series bulldozer swing frames according to claim 5, characterized in that, Handles (10) are installed on both sides of the bow-shaped frame (9).

7. The bidirectional press-fitting device for lubrication pins of high-drive SD series bulldozer swing frames according to claim 6, characterized in that, The hydraulic system includes an oil tank, an oil pump (18), a check valve (20), a directional valve (21), and a hydraulically controlled check valve (22). The oil pump (18) has its suction port connected to the oil tank and its outlet port connected to the P port of the directional valve (21) via the check valve (20). The directional valve (21) has its T port connected to the oil tank and its A port connected to the rodless chambers of the two cylinders (12) via the hydraulically controlled check valve (22). The directional valve (21) has its B port connected to the rod chambers of the two cylinders (12) and the control port of the hydraulically controlled check valve (22).

8. The bidirectional press-fitting device for lubrication pins of high-drive SD series bulldozer swing frames according to claim 7, characterized in that, The oil pump (18) has its suction port connected to the oil tank via a filter (17).

9. The bidirectional press-fitting device for lubrication pins of high-drive SD series bulldozer swing frames according to claim 8, characterized in that, The oil pump (18) is equipped with an overflow valve (19) at its outlet.

10. The bidirectional press-fitting device for lubrication pins of a high-drive SD series bulldozer swing frame according to claim 9, characterized in that, A pressure gauge (23) is installed on the oil pipe between the hydraulic check valve (22) and the oil cylinder (12).

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