High-drive bulldozer walking frame fork head spring press-fitting equipment

Abstract

The utility model discloses a high-drive bulldozer walking frame fork head spring press-fitting device which comprises a box body, a fork head support, a tail bracket, a folding type pressing arm, a locating pin, an oil cylinder and a hydraulic system, the fork head support, the tail bracket and the folding type pressing arm are installed in the box body, a fork head of a fork head assembly is placed in a limiting groove in the top of the fork head support, and the locating pin and the oil cylinder are installed in the box body. The positioning pin penetrates through a positioning hole in the fork head and through holes in the fork head support and the side wall of the box body, a tail sleeve of the fork head assembly is placed in the middle of the tail bracket, the folding type pressing arm is pressed on a middle sleeve of the fork head assembly to be pressed, the oil cylinder is installed at the rear end of the box body, and a piston rod of the oil cylinder is coaxial with the tail sleeve. The hydraulic system is connected with the oil cylinder through an oil pipe. The fork head assembly is fixed through the fork head support, the tail bracket, the folding type pressing arm and the positioning pin, the oil cylinder is used for providing pressure needed by spring press-fitting, operation is convenient and safe, the spring press-fitting difficulty is greatly lowered, the press-fitting efficiency is improved, and potential safety hazards are eliminated.

Description

Technical Field

[0001] This utility model relates to a high-drive SD series (7,8,9,10) bulldozer walking frame fork spring pressing device, belonging to the field of engineering machinery technology. Background Technology

[0002] The main feature of the high-drive SD series (7, 8, 9, 10) bulldozers is that the drive sprocket is detached from the undercarriage, raised, and positioned on the same axis as the steering, braking, clutch, and central drive. Viewed from the side, the tracks appear triangular. This structure effectively eliminates the instantaneous impact load directly transmitted from the ground to the drive sprocket, increasing the lifespan of the entire transmission system by approximately 30%. The bulldozer's running gear consists of the undercarriage, track rollers, idlers, track carrier rollers, track tensioner, and track assembly. In actual assembly, the track rollers, idlers, track carrier rollers, and track tensioner are mounted on the undercarriage. Driven by the drive sprocket, the track assembly rotates around the sprocket, track rollers, idlers, and track carrier rollers, enabling the bulldozer to move forward and backward. The running gear bears the entire weight of the bulldozer and is responsible for its movement; therefore, ensuring the undercarriage provides appropriate tension to the tracks is crucial for stable operation and high work efficiency. Track tension is provided by a tensioning device, and the fork assembly is an important component of the tensioning device (see...). Figure 4 The system includes a fork head 32, a spring 34, a limiting tube 35, a thrust shaft 36, a threaded sleeve 37, a tail sleeve 38, and a middle sleeve 39. The front end of the middle sleeve 39 is connected to the fork head 32, and the rear end is connected to the tail sleeve 38. The spring 34 is compressed inside the tail sleeve 38 and the middle sleeve 39 by the thrust shaft 36. The external thread of the threaded sleeve 37 engages with the internal thread of the tail sleeve 38, preventing the spring 34 and the thrust shaft 36 from disengaging from the tail sleeve 38 and the middle sleeve 39. The compressed spring 34 provides tension to the track. Because the spring 34 has a large mass and a large clamping force, and the fork head has an irregular shape, it is difficult to fix. Therefore, in the past, it was difficult, inefficient and easy to cause safety accidents to press the spring 34 into the tail sleeve 38 and the middle sleeve 39 by manpower. So how to safely and efficiently press the spring into the tail sleeve 38 and the middle sleeve 39 has always been a problem that has troubled relevant technicians. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a high-drive bulldozer travel frame fork spring pressing device, which reduces the difficulty of spring pressing, improves pressing efficiency, and eliminates safety hazards.

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

[0005] A fork spring pressing device for a high-drive bulldozer traveling frame includes a housing, a fork head bracket, a tail bracket, a folding pressure arm, a positioning pin, a hydraulic cylinder, and a hydraulic system. The fork head bracket, tail bracket, and folding pressure arm are installed inside the housing and arranged sequentially from front to back. The fork head of the fork head assembly to be pressed is placed in the limiting groove at the top of the fork head bracket. The positioning pin passes through the positioning hole on the fork head and the through holes on the left and right side walls of the fork head bracket and the housing. The tail sleeve of the fork head assembly to be pressed is placed in the middle of the tail bracket. The folding pressure arm presses on the middle sleeve of the fork head assembly to be pressed. The hydraulic cylinder is installed at the rear end of the housing, and the piston rod of the hydraulic cylinder is coaxial with the tail sleeve. The hydraulic system is connected to the hydraulic cylinder through an oil pipe.

[0006] The aforementioned high-drive bulldozer traveling frame fork spring pressing device includes a tail bracket comprising a support plate and two support plate fixing blocks. The two support plate fixing blocks are symmetrically fixed on the left and right side walls of the housing. The two ends of the support plate are respectively inserted into the slots on the top of the two support plate fixing blocks. The middle part of the support plate is provided with a groove that matches the tail sleeve of the fork assembly to be pressed and installed.

[0007] The aforementioned high-drive bulldozer traveling frame fork spring pressing device has a lifting hole on the support plate, and a nylon block is installed on the part of the support plate that contacts the tail sleeve.

[0008] The aforementioned high-drive bulldozer traveling frame fork spring pressing device has multiple pallets arranged sequentially from front to back, and a pallet frame for placing the pallets is installed at the bottom of the housing.

[0009] The aforementioned high-drive bulldozer travel frame fork spring pressing device includes a folding pressure arm comprising an adjustable bolt, a connecting block, two sets of pressure arms, and two ear plates. The two ear plates are symmetrically fixed on the left and right side walls of the housing. The connecting block is located at the upper part of the middle sleeve of the fork assembly. One end of each set of pressure arms is hinged to the connecting block, and the other end of one set of pressure arms is hinged to one ear plate. The other end of the other set of pressure arms is detachably connected to the other ear plate via a movable pin. The adjustable bolt is screwed into the vertical through-threaded hole in the middle of the connecting block, and the lower end of the adjustable bolt corresponds to the middle sleeve.

[0010] The aforementioned high-drive bulldozer traveling frame fork spring pressing device has multiple fork supports arranged sequentially from front to back.

[0011] The aforementioned high-drive bulldozer traveling frame fork spring pressing device has outriggers installed on both sides of the bottom of the housing.

[0012] The aforementioned high-drive bulldozer traveling frame fork spring pressing 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 chamber of the cylinder via the hydraulically controlled check valve. The directional valve's B port is connected to the rod chamber of the cylinder and the control port of the hydraulically controlled check valve.

[0013] In the aforementioned high-drive bulldozer traveling frame fork spring pressing equipment, the oil pump's suction port is connected to the oil tank via a filter, and the oil pump's outlet port is equipped with an overflow valve.

[0014] In the aforementioned high-drive bulldozer traveling frame fork spring pressing device, a pressure gauge is installed on the oil pipe between the hydraulic control check valve and the oil cylinder.

[0015] This invention utilizes a fork head bracket, a tail bracket, a folding pressure arm, and a positioning pin installed inside the housing to fix the fork head assembly. A hydraulic cylinder provides the pressure required for pressing the spring, making the operation very convenient and safe. This greatly reduces the difficulty of pressing the spring, improves the pressing efficiency, and eliminates safety hazards. 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 a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a structural diagram of the tail bracket;

[0019] Figure 3 This is a schematic diagram of the folding pressure arm.

[0020] Figure 4 This is a structural diagram of the SD7 fork assembly;

[0021] Figure 5 This is a schematic diagram of the press-fitting of the SD7 fork spring;

[0022] Figure 6 This is a structural diagram of the SD7 fork head bracket, in which... Figure 6 (a) is the front view. Figure 6 (b) is a top view;

[0023] Figure 7 These are structural diagrams of the SD8 / 9 and SD10 fork head brackets. Figure 7 (a) is the front view. Figure 7 (b) is a top view;

[0024] Figure 8This is a schematic diagram of the working principle of a hydraulic system.

[0025] The following are the labels in the diagram: 1. Tail bracket; 2. Folding pressure arm; 3. Pallet bracket; 4. SD7 fork head bracket; 5. SD8 / 9 fork head bracket; 6. SD10 locating pin; 7. SD8 / 9 locating pin; 8. SD7 locating pin; 9. Housing; 10. Outrigger; 11. Hydraulic cylinder; 12. SD7 pallet; 13. SD8 / 9 pallet; 14. SD10 pallet; 15. Nylon block; 16. Pallet fixing block; 17. Pin; 18. Hinge shaft; 19. 20. Adjustable bolt; 21. Movable pin; 22. Filter; 23. Oil pump; 24. Relief valve; 25. Check valve; 26. Directional valve; 27. Hydraulic check valve; 28. Pressure gauge; 29. ​​Hydraulic system; 30. Connecting block; 31. Pressure arm; 32. Ear plate; 33. Fork head; 34. Positioning hole; 35. Spring; 36. Limit tube; 37. Thrust shaft; 38. Threaded sleeve; 39. Tail sleeve; 40. Middle sleeve; 41. SD10 fork head bracket. Detailed Implementation

[0026] This utility model addresses the shortcomings of existing technologies by providing a high-drive bulldozer travel frame fork spring pressing device. This device is applicable to SD series (7,8,9,10) bulldozers, and its operation is convenient and quick. It can simplify the spring pressing procedure, reduce the labor intensity of operators, ensure product quality, and effectively reduce production and operating costs.

[0027] See Figure 1 This utility model mainly includes a housing 9, an oil cylinder 11, a hydraulic system 28, a tail bracket 1, a folding pressure arm 2, a pallet frame 3, a fork head bracket, and a positioning pin.

[0028] Multiple support legs 10 are installed on both sides of the bottom of the housing 9 to ensure the stability of the housing 9. Inside the housing 9, a fork head bracket, a folding pressure arm 2, and a tail bracket 1 are installed in sequence from front to back. The fork head bracket is used to support and fix the fork head 32 of the fork head assembly. The top of the fork head bracket is provided with a limiting groove that matches the fork head 32. Through holes coaxial with the positioning holes 33 on the positioning holes 33 on the left and right side walls of the fork head bracket and the housing 9 are provided. Positioning pins are inserted into the through holes and positioning holes 33 to position the fork head 32. The tail bracket 1 includes a support plate and two support plate fixing blocks 16. The two support plate fixing blocks 16 are symmetrically fixed on the left and right side walls of the housing 9. The two ends of the support plate are respectively inserted into the locking grooves on the top of the two support plate fixing blocks 16. The middle of the support plate is provided with a groove that matches the tail sleeve 38 supporting the fork head assembly to limit the tail sleeve 38. The folding pressure arm 2 includes an adjustable bolt 19, a connecting block 29, two sets of pressure arms 30, and two ear plates 3. The two ear plates 3 are symmetrically fixed on the left and right side walls of the housing 9. The connecting block 29 is located on the upper part of the middle sleeve 39 of the fork assembly. The two sets of pressure arms 30 are located on both sides of the connecting block 29, and one end of each set is hinged to the connecting block 29. The other end of one set of pressure arms 30 is hinged to one ear plate 3, and the other end of the other set of pressure arms 30 is detachably connected to another ear plate 3 through a movable pin 20. The adjustable bolt 19 is screwed into the vertical through threaded hole in the middle of the connecting block 29. The lower end of the adjustable bolt 19 rests on the middle sleeve 39. The function of the folding pressure arm 2 is to press the fork assembly tightly onto the tail bracket 1 and the fork support to prevent it from moving during the pressing of the spring.

[0029] The hydraulic cylinder 11 and the hydraulic system 28 are installed at the rear end of the housing 9. The piston rod of the hydraulic cylinder 11 is coaxial with the tail sleeve 38 and is used to press the spring 34 into the tail sleeve 38 and the middle sleeve 39. The hydraulic cylinder 11 is connected to the hydraulic system 28 through an oil pipe.

[0030] To improve the versatility of this equipment and reduce the pressing cost of the fork springs, multiple fork supports and trays are provided to accommodate fork assemblies of different specifications. In this embodiment, three fork supports are provided: SD10 fork support 40, SD8 / 9 fork support 5, and SD7 fork support 4, arranged sequentially from front to back. Each fork support is provided with a locating pin, namely SD10 locating pin 6, SD8 / 9 locating pin 7, and SD7 locating pin 8. Three trays are also provided: SD10 tray 14, SD8 / 9 tray 13, and SD7 tray 12, arranged sequentially from front to back.

[0031] All pallets are equipped with lifting holes. A pallet frame 3 is installed at the bottom of the housing 9. Unused pallets are lifted onto the pallet frame 3 by an overhead crane to avoid interference with the fork assembly.

[0032] Three nylon blocks 15 are installed on the part of the pallet that contacts the tail sleeve 38. The nylon blocks 15 are connected to the pallet by pins 17. This structure can effectively prevent friction and wear between the walking frame fork assembly and the pallet 1 during the pressing process, making the spring pressing process safer, more reliable, convenient and faster.

[0033] The hydraulic system includes an oil tank, filter 21, oil pump 22, relief valve 23, check valve 24, directional valve 25, pilot-operated check valve 26, pressure gauge 27, and oil pipes. The oil pump 22's suction port is connected to the oil tank via filter 21. The oil pump 22's outlet is connected to the P port of directional valve 25 via check valve 24. The T port of directional valve 25 is connected to the oil tank, and its A port is connected to the rodless chamber of cylinder 11 via pilot-operated check valve 26. The B port of directional valve 25 is connected to the rod chamber of cylinder 11 and the control port of pilot-operated check valve 26. Pressure gauge 27 is installed on the high-pressure explosion-proof oil pipe between pilot-operated check valve 26 and cylinder 11. A relief valve 23 is installed between the oil pump 22's outlet and check valve 24 to adjust the working pressure of cylinder 11.

[0034] The motor drives the oil pump 22 to draw oil from the oil tank. The hydraulic oil flows from the oil tank through the oil pump 22 to the relief valve 23. The relief valve 23 is adjusted to the required working pressure. The oil coming out of the relief valve 23 enters the oil cylinder 11 through the reversing valve 25. The extension and retraction of the oil cylinder piston rod is achieved by moving the reversing valve 25.

[0035] In the actual assembly process, first select a suitable support plate according to the fork head of the required press-fit spring, and hoist the interference support plate onto the support plate frame 3. Then, hoist the fork head onto the press-fit equipment. The support plate supports the tail sleeve position of the fork head assembly. Use the positioning pin to position the fork head onto the fork head bracket. Finally, open the folding pressure arm 2 and place it on the upper part of the middle sleeve. Insert the movable pin 20 of the folding pressure arm 2, adjust the adjustable bolt 19, and tighten the middle sleeve. After the fork head assembly is completely fixed, start operating the hydraulic system 28. The oil cylinder 11 presses the spring. The fork head structures of SD7, SD8, SD9, and SD10 are similar, with only differences in length and external dimensions. The press-fit process is the same.

[0036] During press-fitting, first place the spring inside the tail sleeve and the middle sleeve. Different pallets and fork head brackets can be selected for pressing different SD series walking frame fork heads. When changing, first shut down the hydraulic system 28, pull out the movable pin 20, and fold up the folding press arm 2. When pressing the SD7 model fork head, hoist the SD8 / 9 and SD10 pallets 14 onto the pallet frame 3, hoist the SD7 fork head onto the press-fitting equipment, and fix the fork head onto the SD7 fork head bracket 4 by passing the SD7 positioning pin 8 through the positioning hole 33 of the fork head. Then, open the folding press arm 2, insert the movable pin 20, and adjust the adjustable bolt 19 according to the gap between the folding press arm 2 and the fork head. After the fork head is completely fixed, turn on the hydraulic system 28 to perform press-fitting. The SD8 and SD9 models are similar in size and share a set of support plate, locating pins, and fork head brackets. When pressing in SD8 / 9 model fork heads, in addition to replacing the support plate, the SD7 fork head bracket 4 must also be removed, as the fork head bracket has lifting holes. When pressing in SD10 model fork heads, in addition to replacing the support plate, the SD7 fork head bracket 4 and the SD8 / 9 fork head bracket 5 must also be removed.

[0037] This utility model features simple structure, convenience, safety, reliability, and low cost, effectively reducing production costs, simplifying assembly processes, improving product quality, and extending the service life of the entire machine.

Claims

1. A high drive bulldozer walking frame fork head spring press equipment, characterized in that, The box (9), the fork head support, the tail bracket (1), the folding pressing arm (2), the positioning pin, the oil cylinder (11) and the hydraulic system (28) are sequentially arranged from front to back inside the box (9), the fork head (32) of the fork head assembly to be pressed is placed in the limiting groove on the top of the fork head support, the positioning pin passes through the positioning hole (33) on the fork head (32) and the through holes on the left and right side walls of the fork head support and the box (9), the tail sleeve (38) of the fork head assembly to be pressed is placed in the middle of the tail bracket (1), the folding pressing arm (2) is pressed on the middle sleeve (39) of the fork head assembly to be pressed, the oil cylinder (11) is installed at the rear end of the box (9), the piston rod of the oil cylinder (11) is coaxial with the tail sleeve (38), and the hydraulic system (28) is connected with the oil cylinder (11) through an oil pipe.

2. The high drive bulldozer walking frame fork head spring press equipment according to claim 1, characterized in that, The tail bracket (1) comprises a supporting plate and two supporting plate fixing blocks (16), the two supporting plate fixing blocks (16) are symmetrically fixed on the left and right side walls of the box (9), the two ends of the supporting plate are clamped into the clamping grooves on the top of the two supporting plate fixing blocks (16) respectively, and the middle part of the supporting plate is provided with a recess matched with the tail sleeve (38) of the support fork head assembly to be pressed.

3. The high drive bulldozer walking frame fork head spring press equipment according to claim 2, characterized in that, The supporting plate is provided with a hoisting hole, and the nylon block (15) is installed on the part of the supporting plate in contact with the tail sleeve (38).

4. The high drive bulldozer walking frame fork head spring press equipment according to claim 3, characterized in that, A plurality of supporting plates are arranged, and the supporting plates are sequentially arranged from front to back, and the supporting plate rack (3) for placing the supporting plates is installed at the bottom of the box (9).

5. The high drive bulldozer walking frame fork head spring press equipment according to any one of claims 1-4, characterized in that, The folding pressing arm (2) comprises an adjustable bolt (19), a connecting block (29), two groups of pressing arms (30) and two ear plates (31), the two ear plates (31) are symmetrically fixed on the left and right side walls of the box (9), the connecting block (29) is located on the upper part of the middle sleeve (39) of the fork head assembly, one end of each group of pressing arms (30) is hinged to the connecting block (29), the other end of one group of pressing arms (30) is hinged to one ear plate (31), the other end of the other group of pressing arms (30) is detachably connected to the other ear plate (31) through the movable pin (20), and the adjustable bolt (19) is screwed into the vertical through threaded hole in the middle part of the connecting block (29), and the lower end of the adjustable bolt (19) corresponds to the middle sleeve (39).

6. The high drive bulldozer walking frame fork head spring press equipment according to claim 5, characterized in that, A plurality of fork head supports are arranged, and the fork head supports are sequentially arranged from front to back.

7. The high drive bulldozer walking frame fork head spring press equipment according to claim 6, characterized in that, Supporting legs (10) are installed on the two sides of the bottom of the box (9).

8. The high drive bulldozer walking frame fork head spring press equipment according to claim 7, characterized in that, The hydraulic system comprises an oil tank, an oil pump (22), a one-way valve (24), a reversing valve (25) and a hydraulic control one-way valve (26), the oil suction port of the oil pump (22) is connected with the oil tank, the oil outlet is connected with the P port of the reversing valve (25) through the one-way valve (24), the T port of the reversing valve (25) is connected with the oil tank, the A port is connected with the rodless cavity of the oil cylinder (11) through the hydraulic control one-way valve (26), and the B port of the reversing valve (25) is connected with the rod cavity of the oil cylinder (11) and the control oil port of the hydraulic control one-way valve (26).

9. The high drive bulldozer walking frame fork head spring press equipment according to claim 8, characterized in that, The oil suction port of the oil pump (22) is connected with the oil tank through the filter (21), and the oil outlet of the oil pump (22) is provided with the overflow valve (23).

10. The high drive bulldozer walking frame fork head spring press equipment according to claim 9, characterized in that, A pressure gauge (27) is installed on the oil pipe between the hydraulic control one-way valve (26) and the oil cylinder (11).

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