Multi-section piston rod two-way hydraulic oil way control structure

Abstract

The utility model relates to the technical field of multi-section piston rods, in particular to a multi-section piston rod two-way hydraulic oil way control structure which comprises a base, an oil tank, a reversing valve and a hand pump assembly, the top of the base is connected with the oil tank through a bolt, and the side, located on the oil tank, of the top of the base is connected with a hand pump base through a bolt. A hand pump assembly is arranged at the top of the hand pump base; the hand pump assembly comprises a high-pressure plunger sleeve and a low-pressure plunger sleeve, the high-pressure plunger sleeve and the low-pressure plunger sleeve are both fixedly installed on the top of the hand pump base, a high-pressure plunger is connected into the high-pressure plunger sleeve in a sleeved mode, and a low-pressure plunger is connected into the low-pressure plunger sleeve in a sleeved mode. By additionally arranging the bidirectional hydraulic oil circuit control mechanism and utilizing an oil circuit switching mode, control over the bidirectional hydraulic oil circuit of the multiple sections of piston rods is achieved, and therefore the using effect is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to multi -section piston rod technical field, concretely relates to a kind of two-way hydraulic oil path control structure of multi -section piston rod. BACKGROUND

[0002] Multi-section piston rod is one of the important components of jack, usually by multiple different diameter rod section, can be nested telescopic, when jack works, by hydraulic system or mechanical device to exert pressure, push piston rod to extend, to realize the function of jacking object, when pressure is released, piston rod can be retracted under the action of reset device to original position, its work needs to be realized by high-pressure oil in hydraulic system.

[0003] At present, in the process of using multi-section piston rod, lack two-way hydraulic oil path control mechanism, usually multi-section piston rod can only realize one-way hydraulic oil to realize drive, not only poor flexibility of use, and the setting of single oil path is also easy to damage and difficult to realize the control of multi-section piston rod jacking and retraction, therefore a kind of two-way hydraulic oil path control structure of multi-section piston rod is proposed, to increase two-way hydraulic oil path control mechanism, realize the control of two-way hydraulic oil path of multi-section piston rod by the way of switching oil path, to improve use effect. SUMMARY

[0004] In view of the problems in the prior art, the utility model provides a kind of two-way hydraulic oil path control structure of multi-section piston rod, to facilitate the way of switching oil path, realize the control of two-way hydraulic oil path of multi-section piston rod, to improve use effect.

[0005] The utility model solves the technical scheme that it adopts to a kind of two-way hydraulic oil path control structure of multi-section piston rod, including base, oil tank, reversing valve and hand pump assembly, the top of base is connected with oil tank by bolt, the top of base is connected with hand pump base by bolt on the side of oil tank, the top of hand pump base is provided with hand pump assembly;

[0006] The hand pump assembly includes high-pressure plunger sleeve and low-pressure plunger sleeve, and high-pressure plunger sleeve and low-pressure plunger sleeve are fixedly installed on the top of hand pump base, high-pressure plunger sleeve is connected with high-pressure plunger in sleeve joint, low-pressure plunger sleeve is connected with low-pressure plunger in sleeve joint.

[0007] The top of base is connected with reversing valve seat by bolt on the outside of hand pump base, reversing valve seat is provided with reversing valve on the top, O type sealing ring F is arranged in oil path between base and reversing valve seat, reversing valve includes reversing valve handle.

[0008] By adopting the technical scheme, the bidirectional hydraulic oil path control mechanism is increased, the stability of the multi-section piston rod in the working process is improved by using the oil path switching mode, and the bidirectional hydraulic oil path control mechanism is more not affected by the size of the top load force, and is more reliable and flexible to use.

[0009] Specifically, the surface of the reversing valve seat is provided with an upward oil outlet hole, a downward oil outlet hole, a pressure hole and an oil return hole B, the downward oil outlet hole is communicated with the reversing valve above and connected with the base below, the side surface of the reversing valve seat is provided with a shut-off valve hole, the shut-off valve hole is communicated with the upward oil outlet hole, the shut-off valve hole is communicated with the oil return hole B through the connection hole, the shut-off valve hole is provided with a steel ball B, a shut-off valve rod and a gland, the gland is connected with the reversing valve seat through bolts, the shut-off valve rod is connected with the reversing valve seat through threads, one end of the shut-off valve rod abuts against the steel ball B, the shut-off valve hole is provided with an O-shaped sealing ring C outside the periphery of the shut-off valve rod, the upward oil outlet hole is communicated with the reversing valve above and fixedly connected with the base below, the upward oil outlet hole is provided with a one-way valve E, a one-way valve spring seat, a one-way valve spring and a one-way valve spring retainer ring.

[0010] By adopting the technical scheme, the shut-off valve rod can be tightened to maintain pressure, and can be loosened to release pressure, and after pressure release, the hydraulic oil flows to the oil tank through the oil return hole A, the one-way valve spring retainer ring is threadedly connected with the reversing valve seat, and the hydraulic oil backflow can be prevented.

[0011] Specifically, the surface of the base is provided with an oil return hole A, a low-pressure plunger oil inlet hole, a high-pressure plunger oil inlet hole and a high-pressure pressure regulating oil return hole, and the oil return hole A, the low-pressure plunger oil inlet hole, the high-pressure plunger oil inlet hole and the high-pressure pressure regulating oil return hole are all communicated with the oil tank, the high-pressure plunger oil inlet hole is communicated with the high-pressure plunger sleeve through an intermediate oil path, and the low-pressure plunger oil inlet hole is communicated with the low-pressure plunger sleeve through an intermediate oil path, the high-pressure plunger sleeve is provided with a one-way valve A on the top of one side oil outlet hole, the high-pressure plunger sleeve is provided with a one-way valve B on the top of the other side oil inlet hole, the low-pressure plunger sleeve is provided with a one-way valve C on the top of one side oil outlet hole, and the low-pressure plunger sleeve is provided with a one-way valve D on the top of the other side oil inlet hole.

[0012] By adopting the technical scheme, when the high-pressure plunger rises, the hydraulic oil is sucked into the high-pressure plunger sleeve cavity through the high-pressure plunger oil inlet hole and the left side oil outlet hole of the hand pump base to lift the one-way valve A; when the high-pressure plunger descends, the one-way valve A is arranged above the left side oil outlet hole, so that the hydraulic oil cannot return to the oil tank, the hydraulic oil of the low-pressure plunger sleeve and the one-way valve D is combined to enter the high-pressure pressure regulating hole from the right side oil outlet hole, and the one-way valve D is arranged above the right side oil inlet hole, so that the hydraulic oil of the low-pressure plunger sleeve cannot enter the high-pressure plunger sleeve cavity.

[0013] When the low-pressure plunger rises, hydraulic oil is sucked into the inner cavity of the low-pressure plunger sleeve from the low-pressure plunger oil inlet hole through the left side oil outlet hole of the hand pump base to lift the check valve C; when the low-pressure plunger descends, the hydraulic oil cannot return to the oil tank through the left side oil outlet hole and the hydraulic oil of the high-pressure plunger sleeve is merged into the high-pressure pressure regulating hole, and the check valve D arranged above the right side oil outlet hole can prevent the hydraulic oil of the high-pressure plunger sleeve from entering the inner cavity of the low-pressure plunger sleeve.

[0014] Specifically, O-shaped sealing rings A are arranged in the intermediate oil paths of the plunger oil inlet hole and the high-pressure plunger oil inlet hole, O-shaped sealing rings B and dustproof rings A are arranged at the top of the high-pressure plunger sleeve and outside the high-pressure plunger, a red copper gasket A is arranged between the hand pump base and the high-pressure plunger sleeve, dustproof rings B and O-shaped sealing rings E are arranged in the low-pressure plunger sleeve, a red copper gasket C is arranged between the low-pressure plunger sleeve and the hand pump base, the base comprises a screw, and the hand pump base comprises a plug.

[0015] By adopting the above technical scheme, the O-shaped sealing rings A, the O-shaped sealing rings B, the dustproof rings A, the red copper gasket A, the dustproof rings B and the O-shaped sealing rings E play the sealing and dustproof roles, and the plug and the screw play the hole plugging role.

[0016] Specifically, handle shafts are arranged at the top of the high-pressure plunger sleeve and the top of the low-pressure plunger sleeve, and the bottoms of the handle shafts are rotatably connected with the high-pressure plunger and the low-pressure plunger respectively, and the hand pump base and the handle shafts are rotatably connected through the arrangement of connecting rods.

[0017] By adopting the above technical scheme, the handle shafts can conveniently drive the high-pressure plunger sleeve and the low-pressure plunger sleeve of the hand pump assembly to perform the rising or descending action.

[0018] Specifically, the inside of the base is threadedly connected with a high-pressure pressure regulating rod, one side of the high-pressure pressure regulating rod is provided with a spring, a spring seat and a steel ball A, a high-pressure pressure regulating rod hole is formed in the inside of the base, the high-pressure pressure regulating rod hole is located at one side of a high-pressure pressure regulating oil return hole, and the high-pressure pressure regulating oil return hole is located in the middle of the spring.

[0019] By adopting the above technical scheme, the hydraulic oil generated by the operation of the hand pump assembly is delivered to the reversing valve seat through the high-pressure pressure regulating rod hole, the high-pressure pressure regulating rod controls the working pressure, and the excess hydraulic oil flows into the oil tank from the high-pressure pressure regulating rod oil return hole.

[0020] Specific, the top of the base is located on the other side of the oil tank is provided with an oil cylinder, and the oil cylinder is connected with the base through threads, the oil cylinder comprises an outer step, a purple copper gasket B is arranged between the oil cylinder and the base, a plurality of piston rods are arranged in the oil cylinder, a descending oil inlet hole is arranged in the oil cylinder, an O-shaped sealing ring D is arranged on the outer wall of the oil cylinder, a cap is arranged on the top of the oil cylinder, and the cap is connected with the oil cylinder through threads, a process hole is formed in the outer surface of the cap, an oil outlet hole is formed in the inner wall of the plurality of piston rods, an oil inlet hole is formed in the outer wall of the plurality of piston rods, and a connecting hole is arranged between the oil outlet hole and the oil inlet hole, so that the oil outlet hole and the oil inlet hole are communicated.

[0021] By adopting the technical scheme, the hydraulic oil is discharged from the descending outlet hole of the reversing valve seat, reaches the outer step at the bottom of the oil cylinder, enters the oil inlet hole through the descending oil inlet hole, is discharged from the oil outlet hole, and is climbed by sections until the highest section of the piston rod, so that the plurality of piston rods are lowered.

[0022] The utility model discloses the beneficial effects of:

[0023] The utility model discloses a plurality of piston rod two -way hydraulic oil circuit control structure, through setting up the base, oil tank, hand -operated pump base, hand -operated pump subassembly, high -pressure plunger cover, low -pressure plunger cover, high -pressure plunger and low -pressure plunger, can utilize the mode of switching oil circuit of reversing valve, realizes the control of two -way hydraulic oil circuit, so that the plurality of piston rod realizes the action of jacking or lowering, is no longer limited by the influence of the load pressure size of piston rod top, and control is more stable and reliable. DRAWINGS

[0024] The utility model is further explained below in combination with the drawings and examples.

[0025] Figure 1 It is the whole structure schematic diagram of the utility model;

[0026] Figure 2 It is the high -pressure plunger cover cross section structure schematic diagram of the utility model;

[0027] Figure 3 It is the low -pressure plunger cover cross section structure schematic diagram of the utility model;

[0028] Figure 4 It is the side cross section structure schematic diagram of the utility model;

[0029] Figure 5 It is the reversing valve cross section structure schematic diagram of the utility model;

[0030] Figure 6 It is the descending oil outlet hole cross section structure schematic diagram of the utility model;

[0031] Figure 7 It is the oil return hole A cross section structure schematic diagram of the utility model;

[0032] Figure 8 This is a cross-sectional structural diagram of the hydraulic cylinder and multi-section piston rod of this utility model;

[0033] In the diagram: 1. Base; 2. Oil tank; 3. Oil return hole A; 4. Low-pressure plunger inlet; 5. High-pressure plunger inlet; 6. High-pressure regulating return hole; 7. Hand pump base; 8. O-ring A; 9. High-pressure plunger sleeve; 10. High-pressure plunger; 11. O-ring B; 12. Dust ring A; 13. Copper gasket A; 14. Low-pressure plunger sleeve; 15. Low-pressure plunger; 16. Connecting rod; 17. Handle shaft; 18. Check valve A; 19. Check valve B; 20. Screw; 21. Plug; 22. Check valve C; 23. Check valve D; 24. High-pressure regulating rod; 25. Spring; 26. Spring seat; 27. Steel ball A; 28. Reversing valve seat; 29. ​​Rising oil outlet; 30. Cut-off valve hole; 31. Steel ball B 32. Throttling valve stem; 33. Pressure cap; 34. O-ring seal C; 35. Directional control valve; 36. Check valve E; 37. Check valve spring seat; 38. Check valve spring; 39. Check valve spring support ring; 40. Oil cylinder; 41. Multi-section piston rod; 42. Downward oil outlet; 43. Directional control valve handle; 44. Hand pump assembly; 45. Pressure hole; 46. Return oil hole B; 47. Downward oil inlet; 48. Copper gasket B; 49. O-ring seal D; 50. Cap; 51. Process hole; 52. Oil outlet; 53. Oil inlet; 54. Connection hole; 55. Dustproof ring B; 56. O-ring seal E; 57. Copper gasket C; 58. High-pressure regulating rod hole; 59. O-ring seal F; 60. Outer step. Detailed Implementation

[0034] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0035] To facilitate the control of the bidirectional hydraulic circuit of the multi-section piston rod by switching oil circuits, thereby improving the performance, such as... Figures 1-8 As shown, the multi-section piston rod bidirectional hydraulic oil circuit control structure of this utility model includes a base 1, an oil tank 2, a reversing valve 35 and a hand-cranked pump assembly 44. The top of the base 1 is bolted to the oil tank 2, and the top of the base 1 is bolted to one side of the oil tank 2 to the hand-cranked pump base 7. The top of the hand-cranked pump base 7 is provided with the hand-cranked pump assembly 44.

[0036] The hand pump assembly 44 comprises a high-pressure plunger sleeve 9 and a low-pressure plunger sleeve 14, and the high-pressure plunger sleeve 9 and the low-pressure plunger sleeve 14 are fixedly installed on the top of the hand pump base 7, the high-pressure plunger sleeve 9 is sleeved with a high-pressure plunger 10, and the low-pressure plunger sleeve 14 is sleeved with a low-pressure plunger 15;

[0037] The top of the base 1 is provided with a reversing valve seat 28 outside the hand pump base 7 through bolt connection, the top of the reversing valve seat 28 is provided with a reversing valve 35, and the oil passage between the base 1 and the reversing valve seat 28 is provided with an O-shaped sealing ring F59, and the reversing valve 35 comprises a reversing valve handle 43.

[0038] In use, through the base 1, the oil tank 2, the reversing valve 35, the hand pump assembly 44, the reversing valve seat 28 and the reversing valve 35, a bidirectional hydraulic oil passage control mechanism can be increased, the stability of the multi-section piston rod in the working process is improved by using the oil passage switching mode, and the use is more reliable and flexible.

[0039] As shown in Figure 5 、 Figure 6 The surface of the reversing valve seat 28 is provided with an ascending oil outlet hole 29, a descending oil outlet hole 42, a pressure hole 45 and an oil return hole B46, the descending oil outlet hole 42 is communicated with the reversing valve 35 above and connected with the base 1 below, the side surface of the reversing valve seat 28 is provided with a cut-off valve hole 30, the cut-off valve hole 30 is communicated with the ascending oil outlet hole 29, the cut-off valve hole 30 is communicated with the oil return hole B46 through a connection hole, the cut-off valve hole 30 is provided with a steel ball B31, a cut-off valve rod 32 and a gland 33, the gland 33 is connected with the reversing valve seat 28 through bolts, the cut-off valve rod 32 is connected with the reversing valve seat 28 through threads, one end of the cut-off valve rod 32 abuts against the steel ball B31, and the cut-off valve hole 30 is provided with an O-shaped sealing ring C34 outside the periphery of the cut-off valve rod 32.

[0040] In use, the cut-off valve rod 32 can be tightened to maintain pressure, and the cut-off valve rod 32 can be loosened to release pressure, after pressure release, hydraulic oil flows to the oil tank 2 through the oil return hole A3, the one-way valve spring retainer 39 is threadedly connected with the reversing valve seat 28, and the hydraulic oil backflow can be prevented.

[0041] As shown in Figure 3As shown, this utility model also includes a return oil hole A3, a low-pressure plunger inlet hole 4, a high-pressure plunger inlet hole 5, and a high-pressure regulating return oil hole 6 on the surface of the base 1. The return oil hole A3, the low-pressure plunger inlet hole 4, the high-pressure plunger inlet hole 5, and the high-pressure regulating return oil hole 6 are all connected to the oil tank 2. The high-pressure plunger inlet hole 5 is connected to the high-pressure plunger sleeve 9 through an intermediate oil passage, and the low-pressure plunger inlet hole 4 is connected to the low-pressure plunger sleeve 14 through an intermediate oil passage. A one-way valve A18 is provided at the top of the oil outlet hole on one side of the high-pressure plunger sleeve 9, and a one-way valve B19 is provided at the top of the oil inlet hole on the other side of the high-pressure plunger sleeve 9. A one-way valve C22 is provided at the top of the oil outlet hole on one side of the low-pressure plunger sleeve 14, and a one-way valve D23 is provided at the top of the oil inlet hole on the other side of the low-pressure plunger sleeve 14.

[0042] During use, when the high-pressure plunger 10 rises, hydraulic oil is drawn from the high-pressure plunger inlet 5 through the left outlet of the hand-cranked pump base 7, which lifts the check valve A18, into the inner cavity of the high-pressure plunger sleeve 9. When the high-pressure plunger 10 falls, the check valve A18 above the left outlet prevents the hydraulic oil from returning to the oil tank 2. The hydraulic oil from the right outlet, which lifts the check valve D23, merges with the hydraulic oil from the low-pressure plunger sleeve 14 and enters the high-pressure regulating port 58. The check valve D23 above the right inlet prevents the hydraulic oil from the low-pressure plunger sleeve 14 from entering the inner cavity of the high-pressure plunger sleeve 9.

[0043] When the low-pressure plunger 15 rises, hydraulic oil is drawn from the low-pressure plunger inlet 4 through the left outlet of the hand-cranked pump base 7, lifting the check valve C22 into the inner cavity of the low-pressure plunger sleeve 14. When the low-pressure plunger 15 falls, the hydraulic oil cannot return to the oil tank due to the check valve C22 set in the left outlet. It merges with the hydraulic oil in the high-pressure plunger sleeve 9 from the right outlet and enters the high-pressure regulating port 58. The check valve D23 set above the right outlet can prevent the hydraulic oil in the high-pressure plunger sleeve 9 from entering the inner cavity of the low-pressure plunger sleeve 14.

[0044] For example, such as Figure 2 , Figure 3 As shown, this utility model also includes: an O-ring A8 is provided in the oil passage between the plunger inlet 4 and the high-pressure plunger inlet 5; an O-ring B11 and a dustproof ring A12 are provided at the top of the high-pressure plunger sleeve 9 on the periphery of the high-pressure plunger 10; a copper gasket A13 is provided between the hand-cranked pump base 7 and the high-pressure plunger sleeve 9; a dustproof ring B55 and an O-ring E56 are provided in the low-pressure plunger sleeve 14; a copper gasket C57 is provided between the low-pressure plunger sleeve 14 and the hand-cranked pump base 7; the base 1 includes a screw 20; and the hand-cranked pump base 7 includes a plug 21.

[0045] In use, the O-shaped sealing ring A8, the O-shaped sealing ring B11, the dustproof ring A12, the red copper gasket A13, the dustproof ring B55 and the O-shaped sealing ring E56 play the roles of sealing and dustproofing, and the plug 21 and the screw 20 play the role of process hole plugging.

[0046] As shown in Figure 2 , Figure 3 illustrated, the utility model still includes, the top of hand pump base 7 is located high pressure plunger sleeve 9 and low pressure plunger sleeve 14's top all is provided with handle shaft 17, and handle shaft 17's bottom is connected with high pressure plunger 10 and low pressure plunger 15 rotation respectively, hand pump base 7 with handle shaft 17 are connected through setting connecting rod 16 rotation.

[0047] In use, through handle shaft 17, the high pressure plunger sleeve 9 and low pressure plunger sleeve 14 of hand pump assembly 44 are conveniently driven to rise or drop action.

[0048] As shown in Figure 4 illustrated, the utility model still includes, the inside of base 1 is connected with high pressure pressure regulating rod 24 through screw thread, one side of high pressure pressure regulating rod 24 is provided with spring 25, spring seat 26 and steel ball A 27, high pressure pressure regulating rod hole 58 is seted up in the inside of base 1, and high pressure pressure regulating rod hole 58 is located one side of high pressure pressure regulating oil return hole 6, and high pressure pressure regulating oil return hole 6 is in the middle of spring 25.

[0049] In use, the hydraulic oil generated by hand pump assembly 44 work is delivered through high pressure pressure regulating rod hole 58 to change-over valve seat 28, high pressure pressure regulating rod 24 controls working pressure, and the excess hydraulic oil flows into oil tank 2 from high pressure pressure regulating rod oil return hole 6.

[0050] As shown in Figure 8 illustrated, the utility model still includes, the top of base 1 is located the other side of oil tank 2 and is provided with oil cylinder 40, and oil cylinder 40 is connected with base 1 through screw thread, oil cylinder 40 includes outer step 60, copper gasket B 48 is seted up between oil cylinder 40 and base 1, a plurality of piston rods 41 are seted up in oil cylinder 40, descending oil inlet hole 47 is seted up in oil cylinder 40, O-shaped sealing ring D 49 is seted up on the outer wall of oil cylinder 40, and cap 50 is seted up on the top of oil cylinder 40, and cap 50 is connected with oil cylinder 40 through screw thread, process hole 51 is seted up on the outer surface of cap 50, oil outlet hole 52 is seted up on the upper portion of the inner wall of a plurality of piston rods 41, oil inlet hole 53 is seted up on the lower portion of the outer wall of a plurality of piston rods 41, and connecting hole 54 is seted up between oil outlet hole 52 and oil inlet hole 53, so that oil outlet hole 52 and oil inlet hole 53 are communicated.

[0051] In use, hydraulic oil from the reversing valve seat 28 of the lower outlet hole 42, to the cylinder bottom outside step 46, through the lower oil inlet hole 47, into the oil inlet hole 53, from the oil outlet hole 52, and gradually climb to the highest section of the piston rod, the multi-section piston rod 41 down, the flange edge below the multi-section piston rod 41 is set, when rising, the flange edge clamping cap 50 can limit the rising space.

[0052] The utility model discloses in using, lifting handle shaft 17 of high pressure plunger 10, make high pressure plunger 10 rise hydraulic oil from high pressure plunger oil inlet hole 5 through left side oil outlet hole of hand pump base 7 and top up one-way valve 18 and inhale to high pressure plunger sleeve 9 inner chamber, handle shaft 17 press down, high pressure plunger 10 drops, set one-way valve 18 above left side oil outlet hole, make hydraulic oil can not return to oil tank 2, and top up one-way valve 23 and the hydraulic oil of low pressure plunger sleeve 14 from right side oil outlet hole and merge and enter high pressure pressure regulating hole 58, set one-way valve 23 above right oil inlet hole, prevent the hydraulic oil of low pressure plunger sleeve 14 from entering high pressure plunger sleeve 9 inner chamber;

[0053] Lifting handle shaft 17 of low pressure plunger 15, make low pressure plunger 15 rise, and hydraulic oil is inhaled to low pressure plunger sleeve 14 inner chamber from low pressure plunger oil inlet hole 4 through left side oil outlet hole of hand pump base 7 and top up one-way valve 22, handle shaft 17 press down, low pressure plunger 15 drops, set one-way valve 22 in left side oil outlet hole, and hydraulic oil can not return to oil tank, and top up one-way valve 23 and the hydraulic oil of high pressure plunger sleeve 9 from right side oil outlet hole and merge and enter high pressure pressure regulating hole 58, set one-way valve 23 above right side oil outlet hole, prevent the hydraulic oil of high pressure plunger sleeve 9 from entering low pressure plunger sleeve 14 inner chamber;

[0054] The hydraulic oil generated by hand pump assembly 44 work is delivered reversing valve seat 28 through high pressure pressure regulating rod hole 58, and high pressure pressure regulating rod 24 controls working pressure, and excess hydraulic oil flows into oil tank 2 from high pressure pressure regulating rod oil return hole 6, and cut-off valve rod 32 is tightened, can keep pressure, and cut-off valve rod 32 is loosened, can be relieved, and after pressure relief, hydraulic oil flows to oil tank 2 through oil return hole A3;

[0055] The reversing valve 35 is switched to the position of the ascending oil outlet hole 29, the stop valve rod 32 is tightened, the hand pump 44 works, the hydraulic oil is lifted from the bottom of the oil cylinder 40, the multi-section piston rod 41 is lifted, the descending oil outlet hole 42 of the reversing valve seat 28 is communicated with the reversing valve 35 at the top, is connected with the base 1 at the bottom, reaches the outer step position 60 at the bottom of the oil cylinder 40 through an oil path, when the top of the multi-section piston rod 41 has a load to be lowered, the stop valve rod 32 is loosened, the oil cylinder 40 is depressurized, and the multi-section piston rod 41 slowly descends; when the top of the multi-section piston rod 41 is empty and has a low load, the multi-section piston rod 41 cannot descend, the reversing valve handle 43 needs to be placed in the position of the descending oil outlet hole 42, the stop valve rod 32 is loosened, hydraulic oil is transported to the inside of the multi-section piston rod 41 through the work of the hand pump 44, the inside of the multi-section piston rod 41 is provided with a through hole, the hydraulic oil reaches the multi-section piston rod 41 from the base 1 through the oil cylinder 40, and the multi-section piston rod 41 slowly descends;

[0056] The reversing valve 35 can switch the oil path, when the hydraulic oil is transported from the pressure hole 45 to the reversing valve 35, the reversing valve 35 can switch the hydraulic oil to flow to the ascending oil outlet hole 29 or the descending oil outlet hole 42 according to actual conditions;

[0057] The hydraulic oil is out of the descending oil outlet hole 42 of the reversing valve seat 28, reaches the outer step position 46 at the bottom of the oil cylinder, enters the oil inlet hole 53 through the descending oil inlet hole 47, is out of the oil outlet hole 52, and is slowly climbed, section by section, to the piston rod of the highest section, so that the multi-section piston rod 41 descends.

[0058] The basic principle, main features and advantages of the utility model are shown and described. It should be understood by those skilled in the industry that the utility model is not limited by the above embodiments, and the above embodiments and the description in the specification are only used to illustrate the principle of the utility model, and various changes and improvements can be made to the utility model without departing from the spirit and scope of the utility model, and the changes and improvements all fall within the scope of the utility model. The protection scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. A multi-section piston rod bidirectional hydraulic oil circuit control structure, characterized in that, The system includes a base (1), an oil tank (2), a reversing valve (35), and a hand pump assembly (44). The top of the base (1) is bolted to the oil tank (2). The top of the base (1) is bolted to a hand pump base (7) located on one side of the oil tank (2). The top of the hand pump base (7) is equipped with a hand pump assembly (44). The hand pump assembly (44) includes a high-pressure plunger sleeve (9) and a low-pressure plunger sleeve (14), and both the high-pressure plunger sleeve (9) and the low-pressure plunger sleeve (14) are fixedly installed on the top of the hand pump base (7). A high-pressure plunger (10) is connected inside the high-pressure plunger sleeve (9), and a low-pressure plunger (15) is connected inside the low-pressure plunger sleeve (14). The top of the base (1) is located outside the hand-cranked pump base (7) and is connected to a reversing valve seat (28) by bolts. A reversing valve (35) is provided on the top of the reversing valve seat (28). An O-ring seal F (59) is provided in the oil passage between the base (1) and the reversing valve seat (28). The reversing valve (35) includes a reversing valve handle (43).

2. The multi-section piston rod bidirectional hydraulic oil circuit control structure according to claim 1, characterized in that, The reversing valve seat (28) has an upward oil outlet hole (29), a downward oil outlet hole (42), a pressure hole (45), and a return oil hole B (46) on its surface. The downward oil outlet hole (42) is connected to the reversing valve (35) above and to the base (1) below. The reversing valve seat (28) has a throttling valve hole (30) on its side. The throttling valve hole (30) is connected to the upward oil outlet hole (29). The throttling valve hole (30) is connected to the return oil hole B (46) through a connecting hole. The throttling valve hole (30) is equipped with a steel ball B (31), a throttling valve rod (32), and a pressure cap (33). The pressure cap (33) is connected to the reversing valve seat (28) by bolts. The throttling valve stem (32) is connected to the reversing valve seat (28) by threads. One end of the throttling valve stem (32) abuts against the steel ball B (31). An O-ring seal C (34) is provided in the throttling valve hole (30) around the throttling valve stem (32). The upper part of the rising oil outlet hole (29) is connected to the reversing valve (35), and the lower part is fixedly connected to the base 1. A one-way valve E (36), a one-way valve spring seat (37), a one-way valve spring (38), and a one-way valve spring support ring (39) are provided in the rising oil outlet hole (29).

3. The multi-section piston rod bidirectional hydraulic oil circuit control structure according to claim 1, characterized in that, The base (1) has an oil return hole A (3), a low-pressure plunger inlet hole (4), a high-pressure plunger inlet hole (5), and a high-pressure regulating return hole (6) on its surface. The oil return hole A (3), the low-pressure plunger inlet hole (4), the high-pressure plunger inlet hole (5), and the high-pressure regulating return hole (6) are all connected to the oil tank (2). The high-pressure plunger inlet hole (5) is connected to the high-pressure plunger sleeve (9) through an intermediate oil passage, and the low-pressure plunger inlet hole (4) is connected to the intermediate oil passage. The high-pressure plunger sleeve (9) is equipped with a one-way valve A (18) at the top of the oil outlet on one side, a one-way valve B (19) at the top of the oil inlet on the other side, a one-way valve C (22) at the top of the oil outlet on one side, and a one-way valve D (23) at the top of the oil inlet on the other side.

4. The multi-section piston rod bidirectional hydraulic oil circuit control structure according to claim 3, characterized in that, O-rings A (8) are provided in the oil passage between the plunger inlet (4) and the high-pressure plunger inlet (5). O-rings B (11) and dust rings A (12) are provided at the top of the high-pressure plunger sleeve (9) on the periphery of the high-pressure plunger (10). A copper gasket A (13) is provided between the hand pump base (7) and the high-pressure plunger sleeve (9). A dust ring B (55) and an O-ring E (56) are provided inside the low-pressure plunger sleeve (14). A copper gasket C (57) is provided between the low-pressure plunger sleeve (14) and the hand pump base (7). The base (1) includes screws (20), and the hand pump base (7) includes a plug (21).

5. The multi-section piston rod bidirectional hydraulic oil circuit control structure according to claim 1, characterized in that, The top of the hand-cranked pump base (7) is provided with a handle shaft (17) on the top of both the high-pressure plunger sleeve (9) and the low-pressure plunger sleeve (14), and the bottom of the handle shaft (17) is rotatably connected to the high-pressure plunger (10) and the low-pressure plunger (15) respectively. The hand-cranked pump base (7) and the handle shaft (17) are rotatably connected by a connecting rod (16).

6. The multi-section piston rod bidirectional hydraulic oil circuit control structure according to claim 1, characterized in that, The base (1) is connected to the high pressure regulating rod (24) by a thread. A spring (25), a spring seat (26) and a steel ball A (27) are provided on one side of the high pressure regulating rod (24). A high pressure regulating rod hole (58) is opened on the inner side of the base (1), and the high pressure regulating rod hole (58) is located on one side of the high pressure regulating return oil hole (6), and the high pressure regulating return oil hole (6) is located in the middle of the spring (25).

7. The multi-section piston rod bidirectional hydraulic oil circuit control structure according to claim 1, characterized in that, A hydraulic cylinder (40) is provided on the top of the base (1) on the other side of the oil tank (2), and the hydraulic cylinder (40) is connected to the base (1) by threads. The hydraulic cylinder (40) includes an outer step (60). A copper gasket B (48) is provided between the hydraulic cylinder (40) and the base (1). A multi-section piston rod (41) is provided in the middle of the hydraulic cylinder (40). A descending oil inlet hole (47) is provided inside the hydraulic cylinder (40). An O-ring seal D (49) is provided on the outer wall of the hydraulic cylinder (40). The top of the oil cylinder (40) is provided with a splice cap (50), and the splice cap (50) is connected to the oil cylinder (40) by threads. The outer surface of the splice cap (50) is provided with a process hole (51). The upper part of the inner wall of the multi-section piston rod (41) is provided with an oil outlet hole (52), and the lower part of the outer wall of the multi-section piston rod (41) is provided with an oil inlet hole (53). A connecting hole (54) is provided between the oil outlet hole (52) and the oil inlet hole (53) to make the oil outlet hole (52) and the oil inlet hole (53) communicate.

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