Crane bolt telescopic system and crane

Abstract

The present invention relates to a crane latch-type telescopic system and a crane, wherein the telescopic system comprises an oil supply source, a first hydraulic cylinder reversing mechanism, a second hydraulic cylinder and an adjusting component, wherein the first hydraulic cylinder is used to drive the telescopic arm of the crane to extend or retract, the reversing mechanism is connected between the oil supply source and the first hydraulic cylinder and is configured to switch the connecting oil path between the oil supply source and the first hydraulic cylinder, the second hydraulic cylinder comprises a second cylinder body and a second piston, the two ends of the second piston are respectively provided with a first rod portion and a second rod portion which can be extended from the second cylinder body, the second hydraulic cylinder is used to drive the cylinder arm pin driving mechanism to move, the cylinder arm pin driving mechanism is used to drive the cylinder pin and the arm pin on the crane to move, the adjusting component is arranged between the first hydraulic cylinder and the second hydraulic cylinder and is configured to adjust the communication relationship between the first hydraulic cylinder and the second hydraulic cylinder so as to drive the first rod portion and the second rod portion of the second hydraulic cylinder to extend or retract through the liquid pressure in the first hydraulic cylinder.

Description

Technical Field

[0001] The invention relates to the technical field of engineering machinery, and in particular to a crane latch type telescopic system and a crane. Background Art

[0002] At present, in the field of engineering machinery, the basic form of the single-cylinder latch telescopic system is to use an independent oil supply system to supply oil to the cylinder head body through a movable core tube arranged inside the telescopic cylinder, use the built-in cylinder in the cylinder head body to pull out the cylinder pin and arm pin, reset the spring, and use the small chamber pressure of the telescopic cylinder to open the balance valve to realize the retraction of the telescopic cylinder.

[0003] Among them, the cylinder head is a device located at a certain position of the telescopic cylinder barrel, used to control the connection and separation between the telescopic cylinder and the boom, and between the booms, and mainly includes a dovetail groove, a cylinder pin, a driving cylinder, etc. The arm pin is used to connect the arms. The arm pin hole is a hole on the boom, which is used to connect the arm pin of a certain boom section. The cylinder pin is used to connect the telescopic cylinder to the tail of each boom section except the basic boom.

[0004] The automatic telescopic system of a single-cylinder latch-type crane realizes the telescopic function of the boom through the combined action of the telescopic cylinder, arm pin and cylinder pin. The specific implementation method is: when the arm pin is inserted, the arm pin is inserted into the arm pin hole by relying on the reset spring to lock the two adjacent sections of the boom together; when the cylinder pin is pulled out, the cylinder pin is disengaged from the cylinder pin hole on the boom, and the telescopic cylinder and the boom are disengaged, so that empty cylinder telescopic function can be realized; when the cylinder pin is inserted, the cylinder pin is inserted into the cylinder pin hole on the boom, and the telescopic cylinder and the boom are locked together, so that telescopic function with the boom can be realized.

[0005] Boom extension process:

[0006] Find the arm position forward: pull out the cylinder pin → find the arm position → find the arm position and insert the cylinder pin → pull out the arm pin → extend the cylinder with the arm → (decelerate in advance and release the arm pin) insert the arm pin

[0007] Find the arm position backward: pull out the cylinder pin → retract the cylinder to find the arm position → find the arm position and insert the cylinder pin → pull out the arm pin → extend the cylinder with the arm → (decelerate in advance and release the arm pin) insert the arm pin

[0008] Boom retraction process:

[0009] Retracting the non-current arm: pull out the cylinder pin → find the arm position → insert the cylinder pin → pull out the arm pin → retract the arm → insert the arm pin Retracting the current arm: pull out the arm pin → retract the arm → insert the arm pin

[0010] like Figure 1The figure shows the hydraulic principle diagram of the single cylinder bolt-type telescopic system of the crane in the related art. The high-pressure oil output by the variable pump 31 is input into the rod chamber or rodless chamber of the telescopic oil cylinder 34 through the control of the three-position four-way electric proportional reversing valve 32 and the balance valve 33, thereby controlling the retraction and extension of the telescopic oil cylinder. The pressure oil output by the quantitative pump 43 is controlled by the two-position four-way electromagnetic reversing valve 44, and reaches the two-position three-way electromagnetic reversing valve 36 through the core tube 35 set inside the telescopic oil cylinder 34. The high-pressure oil is controlled by the electromagnetic reversing valve 36 and output to the cylinder pin cylinder 39 or the arm pin cylinder 38. The two hydraulic cylinders overcome the resistance of the reset spring 40 and push the cylinder pin driving mechanism 41 or the arm pin driving mechanism 42 to pull out the cylinder pin and the arm pin.

[0011] When the electromagnetic coil Y1a of the electric proportional reversing valve 32 is energized, the electric proportional reversing valve 32 is in the left position, and the high-pressure oil of the variable pump 31 reaches the inlet of the balance valve 33 through the throttle valve port of the electric proportional reversing valve 32. The pressure oil is divided into two paths, one of which enters the rod chamber of the telescopic oil cylinder 34, and the other pressure oil is used as the control oil to drive the valve core of the balance valve 33 to move. The balance valve 33 connects the oil path between the rodless chamber of the telescopic oil cylinder 34 and the electric proportional reversing valve 32. At this time, the rod chamber of the telescopic oil cylinder 34 enters the oil, and the rodless chamber returns the oil, and the oil cylinder retracts.

[0012] When the electromagnetic coil Y1b of the electric proportional reversing valve 32 is energized, the electric proportional reversing valve 32 is in the right position, oil flows into the rodless chamber of the telescopic oil cylinder 34, oil returns to the rod chamber, and the oil cylinder extends.

[0013] The pressure oil for realizing the action of pulling out the cylinder pin and the arm pin of the boom is provided by the metering pump 43. An electromagnetic reversing valve 44, a relief valve 45, an accumulator 46, a relief valve 47 and a relief valve 48 are arranged between the metering pump 43 and the telescopic oil cylinder 34. When the electromagnetic coils of the electromagnetic reversing valve 44 and the electromagnetic reversing valve 36 are not energized, the cylinder pin oil cylinder 39 and the arm pin oil cylinder 38 are retracted under the action of the return spring 40, and the cylinder pin and the arm pin are both in an extended state. When the electromagnetic coil of the electromagnetic reversing valve 44 is energized, the high-pressure oil output by the metering pump 43 passes through the core tube 35 in the telescopic oil cylinder 34 to the inlet of the electromagnetic reversing valve 36. At this time, if the electromagnetic reversing valve 36 is not energized, the pressure oil will enter the arm pin oil cylinder 38, and the arm pin oil cylinder 38 drives the arm pin driving mechanism 42 to achieve the arm pin pulling action; if the electromagnetic reversing valve 36 is energized, the high-pressure oil will enter the cylinder pin oil cylinder 39, and the cylinder pin oil cylinder 39 drives the cylinder pin driving mechanism 41 to complete the cylinder pin pulling action. In the case that the electromagnetic reversing valve 36 in the telescopic arm cannot be reversed, an external oil source can be connected through the quick-change connector 37 to achieve emergency cylinder pin pulling.

[0014] The above solutions in the related art have at least the following disadvantages:

[0015] (1) The single-cylinder bolt extension system adopts the industry's common technical route, which has large power loss and high fuel consumption: ① The cylinder arm pin mechanism requires a separate oil supply system, which is driven by the active core tube in the telescopic cylinder; when the cylinder is extended and retracted, the flow of the active core tube must be guaranteed while the system pressure must be guaranteed. The continuous high pressure of the system causes energy loss. ② In order to avoid the inherent defect of the system that "the telescopic cylinder leaks out when the core tube builds pressure", it is necessary to add a back pressure valve to generate back pressure to avoid this defect, which further increases power loss.

[0016] (2) The single-cylinder bolt telescopic system with a core tube is expensive and it is difficult to further improve the lightweight: ① The telescopic cylinder has a movable core tube, which has a complex structure and high processing precision requirements, resulting in high cost of the telescopic cylinder. ② The cylinder arm pin drive system has a small selection range of parts, and the cylinder arm pin switching valve needs to use an expensive zero-leakage electromagnetic ball valve, resulting in high prices for the selected parts. ③ The cylinder arm pin drive system requires an independent oil supply valve, especially the oil supply valve assembly of large-tonnage products, which has a complex principle and uses all imported parts.

[0017] (3) The single-cylinder bolt telescopic system is difficult to promote and apply on small-tonnage products: small-tonnage products are limited by the width of the arm tail, and the cylinder head body cannot be expanded, resulting in the piston rod also cannot be expanded, so the movable core tube is difficult to arrange.

[0018] It should be noted that the information disclosed in the background technology section of the present invention is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes prior art already known to those skilled in the art. Summary of the invention

[0019] The embodiment of the present invention provides a crane latch-type telescopic system and a crane, which can simplify the structure of the telescopic system and help reduce the fuel consumption of the system.

[0020] According to one aspect of the present invention, there is provided a crane latch type telescopic system, comprising:

[0021] Oil supply source;

[0022] A first hydraulic cylinder is used to drive the telescopic arm of the crane to extend or retract;

[0023] a reversing mechanism connected between the oil supply source and the first hydraulic cylinder and configured to switch the connecting oil path between the oil supply source and the first hydraulic cylinder;

[0024] a second hydraulic cylinder, comprising a second cylinder body and a second piston, wherein both ends of the second piston are respectively provided with a first rod portion and a second rod portion which can be extended from the second cylinder body, the second hydraulic cylinder is used to drive a cylinder arm pin driving mechanism to move, and the cylinder arm pin driving mechanism is used to drive a cylinder pin for connecting the first hydraulic cylinder and the telescopic arm on the crane and an arm pin for connecting two sections of the telescopic arm on the crane to move; and

[0025] The adjusting component is arranged between the first hydraulic cylinder and the second hydraulic cylinder and is located outside the first hydraulic cylinder and the second hydraulic cylinder. The adjusting component is configured to adjust the communication relationship between the first hydraulic cylinder and the second hydraulic cylinder to drive the first rod part and the second rod part of the second hydraulic cylinder to extend or retract through the liquid pressure in the first hydraulic cylinder.

[0026] In some embodiments, the regulating assembly includes a first one-way valve, a first reversing valve and a second reversing valve. The inlet of the first one-way valve is connected to the rod chamber of the first hydraulic cylinder, and the outlet of the first one-way valve is connected to the first reversing valve and the second reversing valve respectively. The first reversing valve is connected to the chamber where the first rod portion of the second cylinder body is located, and the second reversing valve is connected to the chamber where the second rod portion of the second cylinder body is located.

[0027] In some embodiments, the regulating assembly also includes a hydraulically controlled third reversing valve, wherein the first working oil port and the second working oil port of the third reversing valve are respectively connected to the first reversing valve and the first rod chamber of the second cylinder body, the third working oil port of the third reversing valve is connected to the outlet of the first one-way valve, the first control oil port of the third reversing valve is connected to the outlet of the first one-way valve, and the second control oil port of the third reversing valve is connected to the first reversing valve.

[0028] In some embodiments, the crane latch-type telescopic system further includes an accumulator connected to the oil path connecting the outlet of the first one-way valve and the third reversing valve.

[0029] In some embodiments, the adjustment component also includes a second one-way valve and a third one-way valve, the outlet of the second one-way valve is connected to the rod chamber of the first hydraulic cylinder, the inlet of the second one-way valve is connected to the connection point a, the connection point a is respectively connected to the first reversing valve and the second reversing valve, the inlet of the third one-way valve is connected to the connection point a, and the outlet of the third one-way valve is connected to the rodless chamber of the first hydraulic cylinder.

[0030] In some embodiments, the crane latch-type telescopic system further includes a shut-off valve and a quick-change joint, which are connected in series to the second reversing valve and the chamber where the second rod portion of the second cylinder is located.

[0031] In some embodiments, the crane latch-type telescopic system also includes a first overflow valve, a second overflow valve and a switch valve. The first overflow valve and the second overflow valve are connected in parallel between the rod chamber of the first hydraulic cylinder and the oil supply source. The switch valve is connected between the rod chamber of the first hydraulic cylinder and the first overflow valve. The opening pressure of the first overflow valve is less than the opening pressure of the second overflow valve.

[0032] In some embodiments, the crane latch-type telescopic system also includes a pilot oil source, a first pilot control valve and a second pilot control valve, the reversing mechanism includes a fourth reversing valve, the first pilot control valve is connected between the pilot oil source and the first control end of the fourth reversing valve, and the second pilot control valve is connected between the pilot oil source and the second control end of the fourth reversing valve.

[0033] In some embodiments, the crane latch-type telescopic system further includes a balancing valve and a third pilot control valve, wherein the balancing valve is disposed between the oil supply source and the first hydraulic cylinder, and the third pilot control valve is connected between the pilot oil source and the control end of the balancing valve.

[0034] According to another aspect of the present invention, a crane is provided, comprising the above-mentioned crane latch type telescopic system.

[0035] Based on the above technical scheme, in the embodiment of the present invention, an adjusting component is provided between the first hydraulic cylinder and the second hydraulic cylinder, and the adjusting component is located outside the first hydraulic cylinder and the second hydraulic cylinder. Therefore, compared with the scheme in the related art, the structure of providing a movable core tube inside the first hydraulic cylinder is eliminated, which can greatly simplify the structure of the telescopic system and reduce the difficulty of processing; moreover, the action of the second hydraulic cylinder is driven by the liquid pressure in the first hydraulic cylinder, so there is no need to provide a special oil supply system for the second hydraulic cylinder, which effectively reduces the power loss of the telescopic system; the second hydraulic cylinder adopts a double-outlet piston rod structure, which can further simplify the structural layout and save the space occupied by the telescopic system. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0037] Figure 1 It is a hydraulic principle diagram of a single-cylinder latch-type telescopic system of a crane in the related art.

[0038] Figure 2 The hydraulic principle diagram of an embodiment of the crane latch-type telescopic system of the present invention.

[0039] In the figure:

[0040] 1. Oil supply source; 2. Hydraulic pump; 3. First pilot control valve; 4. Second pilot control valve; 5. Fourth reversing valve; 6. Third pilot control valve; 7. Balance valve; 8. First hydraulic cylinder; 9. Accumulator; 10. Second check valve; 11. First check valve; 12. Third check valve; 13. First reversing valve; 14. Second reversing valve; 15. Third reversing valve; 16. Stop valve; 17. Quick-change connector; 18. Second hydraulic cylinder; 19. Spring; 20. Cylinder pin drive mechanism; 21. Arm pin drive mechanism; 22. Switch valve; 23. First relief valve; 24. Second relief valve;

[0041] 31. Variable pump; 32. Electric proportional reversing valve; 33. Balance valve; 34. Telescopic cylinder; 35. Core tube; 36. Solenoid reversing valve; 37. Quick-change connector; 38. Arm pin cylinder; 39. Cylinder pin cylinder; 40. Return spring; 41. Cylinder pin driving mechanism; 42. Arm pin driving mechanism; 43. Dosing pump; 44. Solenoid reversing valve; 45. Overflow valve; 46. Accumulator; 47. Overflow valve; 48. Overflow valve. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] In the description of the present invention, it should be understood that the terms "center", "lateral", "longitudinal", "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present invention.

[0044] like Figure 2As shown, in some embodiments of the crane latch-type telescopic system provided by the present invention, the telescopic system includes an oil supply source 1, a first hydraulic cylinder 8, a reversing mechanism, a second hydraulic cylinder 18 and an adjusting assembly. The first hydraulic cylinder 8 is used to drive the telescopic arm of the crane to extend or retract. The reversing mechanism is connected between the oil supply source 1 and the first hydraulic cylinder 8. The reversing mechanism is configured to switch the connecting oil path between the oil supply source 1 and the first hydraulic cylinder 8. The second hydraulic cylinder 18 includes a second cylinder body and a second piston. Both ends of the second piston are respectively provided with a first rod portion and a second rod portion that can be extended from the second cylinder body. The second hydraulic cylinder 18 is used to drive the movement of the cylinder arm pin driving mechanism, and the cylinder arm pin driving mechanism is used to drive the cylinder pin for connecting the first hydraulic cylinder 8 and the telescopic arm on the crane and the arm pin for connecting the two telescopic arms on the crane. The adjusting component is arranged between the first hydraulic cylinder 8 and the second hydraulic cylinder 18 and is located outside the first hydraulic cylinder 8 and the second hydraulic cylinder 18. The adjusting component is configured to adjust the communication relationship between the first hydraulic cylinder 8 and the second hydraulic cylinder 18 so as to drive the first rod portion and the second rod portion of the second hydraulic cylinder 18 to extend or retract through the liquid pressure in the first hydraulic cylinder 8.

[0045] In the embodiment of the present invention, an adjusting component is provided between the first hydraulic cylinder 8 and the second hydraulic cylinder 18, and the adjusting component is located outside the first hydraulic cylinder 8 and the second hydraulic cylinder 18. Therefore, compared with the solutions in the related art, the structure of the core tube provided inside the first hydraulic cylinder 8 is eliminated, which can greatly simplify the structure of the telescopic system and reduce the difficulty of processing; moreover, the action of the second hydraulic cylinder 18 is driven by the liquid pressure in the first hydraulic cylinder 8, so there is no need to provide a special oil supply system for the second hydraulic cylinder 18, which effectively reduces the power loss of the telescopic system; the second hydraulic cylinder 18 adopts a double-outlet piston rod structure, which can further simplify the structural layout and save the space occupied by the telescopic system.

[0046] The second hydraulic cylinder 18 adopts a double-outlet piston rod structure, and can also make the two chambers connected in normal state, using one of the chambers as an oil return tank to achieve rapid resetting of the cylinder arm pin, which will be described in detail below.

[0047] The first hydraulic cylinder 8 includes a first cylinder body and a first piston rod. The first piston rod is disposed in the first cylinder body, and one end of the first piston rod can extend from the first cylinder body. The first piston rod divides the internal space of the first cylinder body into a rod chamber and a rodless chamber. The first piston rod remains stationary, and the first cylinder body extends or retracts relative to the first piston rod.

[0048] The second piston in the second hydraulic cylinder 18 is arranged in the second cylinder body, and the second piston divides the internal space of the second cylinder body into a first chamber and a second chamber. The first rod portion is arranged in the first chamber, one end of the first rod portion is connected to the second piston, and the other end can extend out of the first end of the second cylinder body into the first chamber; the second rod portion is arranged in the second chamber, one end of the second rod portion is connected to the second piston, and the other end can extend out of the second end of the second cylinder body into the second chamber.

[0049] In some embodiments, the regulating assembly includes a first one-way valve 11, a first reversing valve 13 and a second reversing valve 14. The inlet of the first one-way valve 11 is connected to the rod chamber of the first hydraulic cylinder 8, and the outlet of the first one-way valve 11 is connected to the first reversing valve 13 and the second reversing valve 14 respectively. The first reversing valve 13 is connected to the chamber where the first rod portion of the second cylinder body is located, and the second reversing valve 14 is connected to the chamber where the second rod portion of the second cylinder body is located.

[0050] The first reversing valve 13 can be a two-position three-way electromagnetic reversing valve. For example, the first reversing valve 13 includes a first working position and a second working position. Each working position includes three working oil ports. In the first working position, the first oil port is connected to the second oil port, and the third oil port is blocked. In the second working position, the first oil port is blocked, and the third oil port is connected to the second oil port. The second reversing valve 14 can also be a two-position three-way electromagnetic reversing valve. The specific structure can be the same as that of the first reversing valve 13, which will not be described in detail here.

[0051] In other embodiments, the first reversing valve 13 and the second reversing valve 14 may also be replaced by three-position four-way valves or the like.

[0052] By setting the first reversing valve 13 and the second reversing valve 14, the hydraulic oil in the rod chamber of the first hydraulic cylinder 8 can be sent to the first chamber where the first rod portion is located or the second chamber where the second rod portion is located, and switching between the oil circuits can be achieved, thereby achieving switching between the cylinder pin and the arm pin.

[0053] In some embodiments, the regulating assembly further includes a hydraulically controlled third reversing valve 15, wherein the first working oil port of the third reversing valve 15 is in communication with the first reversing valve 13, the second working oil port of the third reversing valve 15 is in communication with the chamber where the first rod portion of the second cylinder is located, the third working oil port of the third reversing valve 15 is in communication with the outlet of the first check valve 11, the first control oil port of the third reversing valve 15 is in communication with the outlet of the first check valve 11, and the second control oil port of the third reversing valve 15 is in communication with the first reversing valve 13. By providing the third reversing valve 15, the connection or disconnection between the first reversing valve 13 and the second hydraulic cylinder 18 can be controlled.

[0054] The third reversing valve 15 adopts a hydraulically controlled valve structure, so that the opening and closing of the third reversing valve 15 can be automatically controlled by the pressure difference between the first hydraulic cylinder 8 and the second hydraulic cylinder 18 to achieve dynamic pressure balance.

[0055] In some embodiments, the telescopic system further includes an accumulator 9 , which is connected to the oil path connecting the outlet of the first one-way valve 11 and the third reversing valve 15 .

[0056] In some embodiments, the regulating assembly also includes a second one-way valve 10 and a third one-way valve 12, the outlet of the second one-way valve 10 is connected to the rod chamber of the first hydraulic cylinder 8, the inlet of the second one-way valve 10 is connected to the connection point a, and the connection point a is respectively connected to the first reversing valve 13 and the second reversing valve 14, the inlet of the third one-way valve 12 is connected to the connection point a, and the outlet of the third one-way valve 12 is connected to the rodless chamber of the first hydraulic cylinder 8.

[0057] In some embodiments, the telescopic system further includes a stop valve 16 and a quick-change connector 17, which are connected in series to the second reversing valve 14 and the chamber where the second rod portion of the second cylinder is located.

[0058] In some embodiments, the telescopic system also includes a first overflow valve 23, a second overflow valve 24 and a switch valve 22. The first overflow valve 23 and the second overflow valve 24 are connected in parallel between the rod chamber of the first hydraulic cylinder 8 and the oil supply source 1. The switch valve 22 is connected between the rod chamber of the first hydraulic cylinder 8 and the first overflow valve 23. The opening pressure of the first overflow valve 23 is less than the opening pressure of the second overflow valve 24.

[0059] In some embodiments, the telescopic system also includes a pilot oil source, a first pilot control valve 3 and a second pilot control valve 4, the reversing mechanism includes a fourth reversing valve 5, the first pilot control valve 3 is connected between the pilot oil source and the first control end of the fourth reversing valve 5, and the second pilot control valve 4 is connected between the pilot oil source and the second control end of the fourth reversing valve 5.

[0060] In some embodiments, the telescopic system further includes a balancing valve 7 and a third pilot control valve 6 . The balancing valve 7 is disposed between the oil supply source 1 and the first hydraulic cylinder 8 . The third pilot control valve 6 is connected between the pilot oil source and the control end of the balancing valve 7 .

[0061] The following is based on the Figure 2 The hydraulic principle and working process of an embodiment of the crane latch type telescopic system of the present invention are described as follows:

[0062] like Figure 2As shown, the inlet of the variable hydraulic pump 2 is connected to the oil supply source 1 (such as an oil tank), the outlet of the hydraulic pump 2 is connected to the fourth reversing valve 5, the fourth reversing valve 5 adopts a two-position four-way proportional reversing valve, the first working oil port of the fourth reversing valve 5 is connected to the outlet of the hydraulic pump 2, the second working oil port of the fourth reversing valve 5 is connected to the oil tank, the third working oil port of the fourth reversing valve 5 is connected to the rodless chamber of the first hydraulic cylinder 8, and the fourth working oil port of the fourth reversing valve 5 is connected to the rod chamber of the first hydraulic cylinder 8. The first piston rod of the first hydraulic cylinder 8 is provided with a first oil passage connected to the rodless chamber and a second oil passage connected to the rod chamber, the first piston rod is provided with a first oil port connected to the first oil passage and a second oil port connected to the second oil passage on the extended end surface, the third working oil port of the fourth reversing valve 5 is connected to the first oil port, and the fourth working oil port of the fourth reversing valve 5 is connected to the second oil port.

[0063] The first control end of the fourth reversing valve 5 is connected to the first pilot control valve 3, and the second control end is connected to the second pilot control valve 4. The first pilot control valve 3 and the second pilot control valve 4 can adopt a one-position three-way proportional control valve, and the action of the first pilot control valve 3 and the second pilot control valve 4 can be further controlled by controlling the action of the fourth reversing valve 5 through the pilot oil source.

[0064] A balancing valve 7 is also provided between the fourth reversing valve 5 and the first hydraulic cylinder 8. The balancing valve 7 includes a fourth check valve and a two-position two-way switch valve connected in parallel. The control valve of the two-position two-way switch valve is connected to the pilot oil source through the third pilot control valve 6. The third pilot control valve 6 adopts a two-position three-way electric proportional reversing valve. The inlet of the fourth check valve is connected to the third working oil port of the fourth reversing valve 5, and the outlet of the fourth check valve is connected to the first oil port provided on the first piston rod.

[0065] The rod chamber of the first hydraulic cylinder 8 is connected to the inlet of the first check valve 11 and the outlet of the second check valve 10, and the outlet of the first check valve 11 is connected to the third working oil port of the third reversing valve 15 and the left control end of the third reversing valve 15, and the accumulator 9 is connected to the oil path connecting the outlet of the first check valve 11 and the third working oil port of the third reversing valve 15. The outlet of the first check valve 11 is also connected to the third working oil port of the first reversing valve 13 and the third working oil port of the second reversing valve 14, respectively. The inlet of the second check valve 10 is connected to the connection point a, and the connection point a is connected to the inlet of the third check valve 12, the second working oil port of the first reversing valve 13, and the second working oil port of the second reversing valve 14, respectively. The outlet of the third check valve 12 is connected to the rodless chamber of the first hydraulic cylinder 8. The first working oil port of the first reversing valve 13 and the second working oil port of the third reversing valve 15 are connected to the right control end, the first working oil port of the second reversing valve 14 is connected to the stop valve 16, and the stop valve 16 is connected to the second chamber of the second hydraulic cylinder 18. A quick-change connector 17 is connected between the stop valve 16 and the second chamber of the second hydraulic cylinder 18. The first reversing valve 13 and the second reversing valve 14 are both two-position three-way electromagnetic reversing valves, and the third reversing valve 15 is a two-position three-way hydraulically controlled reversing valve.

[0066] like Figure 2 As shown, when the second piston is located in the middle position of the second cylinder body, the first rod portion of the second hydraulic cylinder 18 is exposed from the left side of the second cylinder body, and the second rod portion is exposed from the right side of the second cylinder body. A spring 19 for resetting is provided between the first rod portion and the cylinder pin driving mechanism 20. The first rod portion and the second rod portion are both in a retracted state, and the cylinder pin and the arm pin are both in an extended state.

[0067] When the first rod moves to the left, the spring 19 is compressed, thereby pushing the cylinder pin drive mechanism 20 to move to the left, causing the cylinder pin to retract along the hole on the drive block, thereby realizing the action of pulling out the cylinder pin. When the first rod moves to the left, the second rod also moves to the left, but the movement of the second rod to the left will not trigger the arm pin drive mechanism 21, so the arm pin will not move.

[0068] When the second rod moves to the right, it drives the arm pin driving mechanism 21 to move to the right, so that the arm pin retracts along the hole on the driving block, and the arm pin is pulled out. At this time, the first rod moves to the right with the second rod and does not trigger the cylinder pin driving mechanism to move, so the cylinder pin does not move.

[0069] The connecting oil circuit of the rod chamber of the first hydraulic cylinder 8 and the oil tank directly connected is also provided with a first overflow valve 23 and a second overflow valve 24 connected in parallel, and the oil circuit where the first overflow valve 23 is located is also connected in series with a switch valve 22. The switch valve 22 adopts a two-position two-way electromagnetic reversing valve. The opening pressure of the first overflow valve 23 is less than the opening pressure of the second overflow valve 24. The first overflow valve 23 and the second overflow valve 24 can adopt electromagnetic valves, ordinary overflow valves or electric proportional overflow valves.

[0070] The extension and retraction process of the first hydraulic cylinder 8 is as follows:

[0071] The hydraulic pump 2 outputs high-pressure oil to the inlet of the fourth reversing valve 5 , and the pilot pressure oil acts on the inlets of the first pilot control valve 3 , the second pilot control valve 4 and the third pilot control valve 6 .

[0072] When the electromagnetic coil of the first pilot control valve 3 is energized, the pilot pressure oil acts on the right end face of the valve core of the fourth reversing valve 5 through the hydraulic pipeline, pushing the valve core to move to the left against the spring force. At this time, the high-pressure oil acting on the inlet of the fourth reversing valve 5 passes through the fourth reversing valve 5 and the hydraulic pipeline to reach the rodless chamber of the first hydraulic cylinder 8, and the oil in the rod chamber of the first hydraulic cylinder 8 returns to the oil tank through the pipeline and the fourth reversing valve 5, and the first hydraulic cylinder 8 is in the extension process.

[0073] When the electromagnetic coils of the second pilot control valve 4 and the third pilot control valve 6 are energized, one pilot pressure oil acts on the left end face of the valve core of the fourth reversing valve 5 through the pipeline, pushing the valve core to move to the right against the spring force. At this time, the high-pressure oil at the inlet of the fourth reversing valve 5 passes through the fourth reversing valve 5 and the hydraulic pipeline to reach the rod chamber of the first hydraulic cylinder 8; the other pilot pressure oil passes through the third pilot control valve 6 to the control port of the balance valve 7. Under the action of the pilot pressure, the balance valve 7 connects the rodless chamber of the first hydraulic cylinder 8 with the oil circuit between the fourth reversing valve 5. At this time, the rod chamber of the first hydraulic cylinder 8 enters the high-pressure oil, the rodless chamber oil returns, and the first hydraulic cylinder 8 is in the process of retracting.

[0074] During the retraction of the first hydraulic cylinder 8 , the high-pressure oil in the rod chamber of the first hydraulic cylinder 8 simultaneously opens the first one-way valve 11 to fill the accumulator 9 with liquid.

[0075] The process of pulling out the cylinder pin and arm pin is as follows:

[0076] When the first reversing valve 13, the second reversing valve 14 and the third reversing valve 15 are all in the normal position, the two chambers of the second hydraulic cylinder 18 are in a connected state, and both chambers are connected with the rod chamber of the first hydraulic cylinder 8 through the second one-way valve 10, and are connected with the rodless chamber of the first hydraulic cylinder 8 through the third one-way valve 12. The oil pressure of the two chambers of the second hydraulic cylinder 18 is the same, and because the effective action areas on both sides of the second piston of the second hydraulic cylinder 18 are the same, the piston rod of the second hydraulic cylinder 18 is in the initial position under the action of the spring 19, and the cylinder pin and the arm pin are both in the inserted state.

[0077] The accumulator 9 after filling is in a pressure-maintaining state. When the first reversing valve 13 is energized and the second reversing valve 14 is not energized, the high-pressure oil in the accumulator 9 passes through the first reversing valve 13 and the third reversing valve 15 and enters the left chamber of the second hydraulic cylinder 18, and the oil in the right chamber of the second hydraulic cylinder 18 returns to the low-pressure chamber of the first hydraulic cylinder 8 (a rodless chamber when the first hydraulic cylinder 8 is retracted and a rod chamber when the first hydraulic cylinder 8 is extended), and the piston rod of the second hydraulic cylinder 18 overcomes the resistance of the return spring 19, pulls the arm pin driving mechanism 21, and realizes the arm pin pulling action.

[0078] When the first reversing valve 13 is not energized and the second reversing valve 14 is energized, the high-pressure oil in the accumulator 9 enters the right chamber of the second hydraulic cylinder 18 through the second reversing valve 14, and the oil in the left chamber of the second hydraulic cylinder 18 returns to the low-pressure chamber of the first hydraulic cylinder 8, and the piston rod of the second hydraulic cylinder 18 pushes the cylinder pin driving mechanism 20 to realize the cylinder pin pulling action.

[0079] When the first reversing valve 13 and the second reversing valve 14 both lose power and return to the middle position, the two chambers of the second hydraulic cylinder 18 are connected, and the other chamber of the second hydraulic cylinder 18 is used as an "oil return tank". Under the action of the spring 19, the oil released from the high-pressure chamber of the second hydraulic cylinder 18 is quickly absorbed, so that the oil in one chamber enters the other chamber, thereby realizing the rapid resetting of the cylinder arm pin.

[0080] The process of emergency pulling cylinder pin and arm pin is as follows:

[0081] In the embodiment of the present invention, a relief valve group for limiting the pressure of the rod chamber of the first hydraulic cylinder 8 is arranged in parallel on the connecting oil path from the fourth reversing valve 5 to the rod chamber of the first hydraulic cylinder 8. The relief valve group includes a first relief valve 23, a second relief valve 24 and a switch valve 22. The first relief valve 23 is connected in series with the switch valve 22, and the opening pressure of the first relief valve 23 is less than the opening pressure of the second relief valve 24.

[0082] When the telescopic system works normally, the switch valve 22 is in a power-off state, and the maximum pressure of the rod chamber of the first hydraulic cylinder 8 is controlled by the first relief valve 23. When emergency arm pin extraction is required, the first reversing valve 13 is de-energized, the switch valve 22 is energized, and the second relief valve 24 is used to limit the maximum pressure of the rod chamber of the first hydraulic cylinder 8. At this time, the oil pressure in the rod chamber of the first hydraulic cylinder 8 is sufficient to reverse the third reversing valve 15, and the high-pressure oil enters the left chamber of the second hydraulic cylinder 18 to realize the arm pin extraction action.

[0083] Close the stop valve 16, connect high-pressure oil to the quick-change joint 17, and the high-pressure oil enters the right chamber of the second hydraulic cylinder 18, driving the second piston rod to push the cylinder pin driving mechanism 20 to complete the cylinder pin pulling action.

[0084] Through the description of multiple embodiments of the crane latch-type telescopic system of the present invention, it can be seen that the crane latch-type telescopic system of the present invention utilizes the high-pressure chamber oil of the first hydraulic cylinder in combination with a one-way bridge circuit as a pressure oil source for driving the second hydraulic cylinder to telescope; the same double-outlet second hydraulic cylinder is used to simultaneously control the actions of the cylinder pin and the arm pin. When oil is introduced into one of the chambers of the second hydraulic cylinder, the oil in the other low-pressure chamber is discharged into the low-pressure chamber of the first hydraulic cylinder to achieve the action of pulling out the arm pin; when oil is introduced into the other chamber of the second hydraulic cylinder, the oil in its low-pressure chamber is discharged into the low-pressure chamber of the first hydraulic cylinder to achieve the action of pulling out the cylinder pin; when the first reversing valve and the second reversing valve return to the middle position, the two chambers of the second hydraulic cylinder are connected. The other chamber of the second hydraulic cylinder is used as an "oil return tank" to realize rapid resetting of the cylinder arm pin; the oil released from the high-pressure chamber of the cylinder arm pin cylinder is quickly absorbed to solve the contradiction of "large oil discharge back pressure of the cylinder arm pin cylinder due to the high pressure in the low-pressure chamber of the telescopic cylinder when releasing the cylinder arm pin", thereby improving the release responsiveness and reliability of the cylinder arm pin; the circuit of the telescopic system is controlled by different pressure levels, and switches to a high pressure level under emergency arm pin extraction conditions, and the emergency circuit automatically takes effect to realize emergency arm retraction; when the first hydraulic cylinder retracts, an electric proportional pilot valve is used to control the opening size of the balancing valve, thereby avoiding the influence of the pressure fluctuation of the small chamber of the first hydraulic cylinder on the opening of the balancing valve.

[0085] The telescopic system provided by the present invention eliminates the independent cylinder arm pin oil supply system, effectively reducing the power loss of the telescopic system; eliminates the oil supply valve, "anti-external leakage" back pressure valve, active core in the telescopic oil cylinder, etc. of the "independent cylinder arm pin oil supply system", greatly reducing the power loss of the telescopic system; and enables the cylinder arm pin switching valve to adopt an ordinary reversing valve; the structure of the telescopic oil cylinder is simplified, the processing difficulty is reduced, the weight is reduced, and the cost is also greatly reduced; the contradiction of "the active core tube restricting the inner diameter of the telescopic oil cylinder piston rod" is solved, so that the single-cylinder latch system can be promoted to small and medium-tonnage products.

[0086] The telescopic system provided by the present invention improves energy saving and compactness and reduces system cost.

[0087] Based on the above-mentioned crane latch type telescopic system, the present invention further proposes a crane, which includes the above-mentioned crane latch type telescopic system. The positive technical effects of the crane latch type telescopic system in the above-mentioned embodiments are also applicable to cranes, which will not be repeated here.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that without departing from the principles of the present invention, the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents, and these modifications and equivalent replacements should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A crane latch-type telescopic system, characterized in that: include: Oil supply source (1); A first hydraulic cylinder (8) for driving the telescopic arm of the crane to extend or retract; a reversing mechanism connected between the oil supply source (1) and the first hydraulic cylinder (8), and configured to switch the connecting oil path between the oil supply source (1) and the first hydraulic cylinder (8); a second hydraulic cylinder (18), comprising a second cylinder body and a second piston, the second piston being provided at both ends with a first rod portion and a second rod portion respectively capable of extending from the second cylinder body, the second hydraulic cylinder (18) being used to drive a cylinder arm pin driving mechanism to move, the cylinder arm pin driving mechanism being used to drive a cylinder pin on the crane for connecting the first hydraulic cylinder (8) and the telescopic arm, and an arm pin for connecting two sections of the telescopic arm on the crane to move; and an adjusting component, arranged between the first hydraulic cylinder (8) and the second hydraulic cylinder (18) and located outside the first hydraulic cylinder (8) and the second hydraulic cylinder (18), the adjusting component being configured to adjust the communication relationship between the first hydraulic cylinder (8) and the second hydraulic cylinder (18) so as to drive the first rod portion and the second rod portion of the second hydraulic cylinder (18) to extend or retract through the liquid pressure in the first hydraulic cylinder (8); The regulating assembly comprises a first one-way valve (11), a first reversing valve (13) and a second reversing valve (14); the inlet of the first one-way valve (11) is communicated with the rod chamber of the first hydraulic cylinder (8); the outlet of the first one-way valve (11) is communicated with the first reversing valve (13) and the second reversing valve (14) respectively; the first reversing valve (13) is communicated with the chamber of the second cylinder body where the first rod portion is located; and the second reversing valve (14) is communicated with the chamber of the second cylinder body where the second rod portion is located; The regulating assembly further comprises a hydraulically controlled third reversing valve (15), wherein a first working oil port and a second working oil port of the third reversing valve (15) are respectively connected to the first reversing valve (13) and the chamber where the first rod portion of the second cylinder is located, the third working oil port of the third reversing valve (15) is connected to the outlet of the first non-return valve (11), the first control oil port of the third reversing valve (15) is connected to the outlet of the first non-return valve (11), and the second control oil port of the third reversing valve (15) is connected to the first reversing valve (13); The regulating assembly further comprises a second one-way valve (10) and a third one-way valve (12); the outlet of the second one-way valve (10) is connected to the rod chamber of the first hydraulic cylinder (8); the inlet of the second one-way valve (10) is connected to a connection point a; the connection point a is respectively connected to the first reversing valve (13) and the second reversing valve (14); the inlet of the third one-way valve (12) is connected to the connection point a; and the outlet of the third one-way valve (12) is connected to the rodless chamber of the first hydraulic cylinder (8).

2. The crane latch type telescopic system according to claim 1, characterized in that: It also includes an accumulator (9), the accumulator (9) being connected to the oil path connecting the outlet of the first one-way valve (11) and the third reversing valve (15).

3. The crane latch type telescopic system according to claim 1, characterized in that: It also comprises a stop valve (16) and a quick-change joint (17), wherein the stop valve (16) and the quick-change joint (17) are connected in series to the second reversing valve (14) and the chamber where the second rod portion of the second cylinder is located.

4. The crane latch type telescopic system according to claim 1, characterized in that: The hydraulic oil pump further comprises a first overflow valve (23), a second overflow valve (24) and a switch valve (22); the first overflow valve (23) and the second overflow valve (24) are connected in parallel between the rod chamber of the first hydraulic cylinder (8) and the oil supply source (1); the switch valve (22) is connected between the rod chamber of the first hydraulic cylinder (8) and the first overflow valve (23); and the opening pressure of the first overflow valve (23) is less than the opening pressure of the second overflow valve (24).

5. The crane latch type telescopic system according to claim 1, characterized in that: The invention also comprises a pilot oil source, a first pilot control valve (3) and a second pilot control valve (4); the reversing mechanism comprises a fourth reversing valve (5); the first pilot control valve (3) is connected between the pilot oil source and a first control end of the fourth reversing valve (5); and the second pilot control valve (4) is connected between the pilot oil source and a second control end of the fourth reversing valve (5).

6. The crane latch-type telescopic system according to claim 5, characterized in that: It also includes a balancing valve (7) and a third pilot control valve (6), wherein the balancing valve (7) is arranged between the oil supply source (1) and the first hydraulic cylinder (8), and the third pilot control valve (6) is connected between the pilot oil source and the control end of the balancing valve (7).

7. A crane, characterized in that: It comprises a crane latch-type telescopic system as described in any one of claims 1 to 6.

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