A crane single cylinder bolt telescopic system and crane

Abstract

The application discloses a crane single-cylinder bolt telescopic system and a crane, and the system comprises a hydraulic oil tank, a reversing mechanism, a first hydraulic cylinder, an adjusting mechanism and a second hydraulic cylinder which are connected in sequence; the reversing mechanism is used for switching the connecting oil path between the hydraulic oil tank and the first hydraulic cylinder; the second hydraulic cylinder comprises an arm pin oil cylinder and a cylinder pin oil cylinder; the adjusting mechanism is used for controlling the communication relationship between the first hydraulic cylinder and the arm pin oil cylinder and the cylinder pin oil cylinder; a balance valve and a control mechanism are further arranged between the reversing mechanism and the first hydraulic cylinder; the oil inlet and the oil outlet of the balance valve are connected in series between the reversing mechanism and the rodless cavity of the first hydraulic cylinder; the control oil port of the balance valve is connected to the control mechanism; the application cancels the oil pump for controlling the oil supply of the cylinder pin and the arm pin, reduces the system energy consumption; the first hydraulic cylinder is only used as the oil return passage of the pulling and inserting cylinder arm pin system, realizes the lightweight design, and simultaneously guarantees the responsiveness of the first hydraulic cylinder starting and the stability of the balance valve starting through the control mechanism.

Description

Technical Field

[0001] The invention relates to a crane single-cylinder latch telescopic system and a crane, belonging to the technical field of engineering machinery. Background Art

[0002] The basic form of the current single-cylinder latch telescopic system in the industry is: an independent oil supply system is used to supply oil to the cylinder head body through the movable core tube of the telescopic cylinder; the cylinder pin and arm pin are pulled out through the built-in cylinder in the cylinder head body, and the cylinder pin and arm pin are reset by the spring; the pressure in the small chamber of the telescopic cylinder is used to open the balance valve to realize the retraction of the telescopic cylinder.

[0003] like Figure 1 The figure shows the hydraulic principle of a conventional telescopic system. The extension and retraction of the telescopic cylinder 111 are controlled by a variable hydraulic pump 11 in conjunction with a hydraulically controlled proportional directional valve 14. During operation, the current output by the controller to the variable hydraulic pump 11 is adjusted to control the displacement, and thus the movement speed of the telescopic cylinder 111. The hydraulically controlled proportional directional valve 14 is used to change the direction of the oil flow, switching between the extension and retraction of the telescopic cylinder 111. The cylinder pin and arm pin extraction are performed by a separate hydraulic system. Oil output from a metering pump 117 passes through a directional valve 116, the first core tube 112 in the telescopic cylinder, and the cylinder-arm pin switching valve 113, entering the first cylinder pin cylinder 19 or the first arm pin cylinder 110, completing the cylinder pin and arm pin extraction operations. The cylinder-arm pin switching valve 113 controls the switching between cylinder pin and arm pin extraction. The first accumulator 115 at the outlet of the metering pump 117 is used to reduce the pressure surge during cylinder pin and arm pin extraction.

[0004] The existing technology has the following drawbacks: When the telescopic cylinder 111 is extended or retracted, it must maintain both the flow rate of the first core tube 112 and the system pressure, resulting in significant power loss. The first core tube 112 bears the oil pressure from the cylinder pin and the arm pin, requiring high structural strength, making further lightweighting difficult. Furthermore, when the telescopic cylinder 111 is activated to retract the boom, the opening of the balancing valve often results in the boom suddenly sinking due to its instantaneous full opening, or the slow opening response can result in a prolonged period of unresponsiveness to boom retraction. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a crane single-cylinder latch telescopic system and a crane to solve the technical problems of difficulty in lightweighting the telescopic cylinder and slow response.

[0006] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0007] In a first aspect, the present invention provides a single-cylinder latch and retractable system for a crane, comprising a hydraulic oil tank, a reversing mechanism, a first hydraulic cylinder, an adjusting mechanism, and a second hydraulic cylinder connected in sequence; the first hydraulic cylinder is used to drive the telescopic arm of the crane, and the reversing mechanism is used to switch the connecting oil circuit between the hydraulic oil tank and the first hydraulic cylinder; the second hydraulic cylinder includes an arm pin cylinder and a cylinder pin cylinder, which are respectively used to drive the crane's arm pin pulling mechanism and cylinder pin pulling mechanism; the adjusting mechanism is used to control the communication relationship between the first hydraulic cylinder and the arm pin cylinder and the cylinder pin cylinder;

[0008] The jack-up plate of the hydraulic cylinder is provided with a first hydraulic cylinder, and the jack-up plate of the hydraulic cylinder is provided with a first hydraulic cylinder, and the jack-up plate of the hydraulic cylinder is provided with a second ... Rod chamber; the control oil port of the balancing valve is connected to the first oil port and the second oil port of the first solenoid valve and the second solenoid valve, the rod chamber of the first hydraulic cylinder and the pressure regulating port of the pressure differential control valve through the second damping valve; the control oil port of the balancing valve is connected to the third oil port of the first solenoid valve and the second solenoid valve through the third damping valve and the fourth damping valve; the control oil port of the balancing valve is connected to the fourth oil port of the first solenoid valve and the second solenoid valve; the first oil port of the pressure differential control valve is connected to the rod chamber of the first hydraulic cylinder through the fifth damping valve, and the second oil port of the pressure differential control valve is connected to the hydraulic oil tank.

[0009] Optionally, the first solenoid valve is a normally open two-position two-way valve, and the second solenoid valve is a normally closed two-position two-way valve.

[0010] Optionally, the reversing mechanism includes a hydraulic pump and a first reversing valve, the first oil port of the first reversing valve is connected to the hydraulic oil tank through the hydraulic pump, the second oil port of the first reversing valve is connected to the rodless chamber of the first hydraulic cylinder through a balancing valve, and the third oil port and the fourth oil port of the first reversing valve are respectively connected to the hydraulic oil tank and the rod chamber of the first hydraulic cylinder.

[0011] Optionally, the reversing mechanism also includes a pilot oil source, a first pressure reducing valve and a second pressure reducing valve, the first oil ports of the first pressure reducing valve and the second pressure reducing valve are respectively connected to the first control oil port and the second control oil port of the first reversing valve, and the second oil port and the third oil port of the first pressure reducing valve and the second pressure reducing valve are both connected to the pilot oil source and the hydraulic oil tank.

[0012] Optionally, the reversing mechanism further comprises a second overflow valve and a third overflow valve, first oil ports of the second overflow valve and the third overflow valve are connected to the hydraulic oil tank, and second oil ports of the second overflow valve and the third overflow valve are connected to the second oil port and the fourth oil port of the first reversing valve respectively.

[0013] Optionally, the reversing mechanism further comprises a double check valve, the double check valve is connected in series between the fourth oil port of the first reversing valve and the rod cavity of the first hydraulic cylinder.

[0014] Optionally, the adjusting mechanism comprises an accumulator, a fourth overflow valve, a second reversing valve, a third reversing valve and a sequence valve, the accumulator is connected to the rod cavity of the first hydraulic cylinder, the first oil port of the second reversing valve and the third reversing valve and the first oil port of the sequence valve respectively, the accumulator is connected to the core tube of the first hydraulic cylinder, the second oil port of the second reversing valve and the third reversing valve through the fourth overflow valve respectively, the third oil port of the second reversing valve is connected to the cylinder pin oil cylinder, the third oil port of the third reversing valve is connected to the second oil port of the sequence valve, the third oil port of the sequence valve is connected to the arm pin oil cylinder, and the control oil port of the sequence valve is connected to the core tube of the first hydraulic cylinder.

[0015] Optionally, the adjusting mechanism comprises a ball valve and a quick connector, the ball valve and the quick connector are connected in series between the third working oil port of the second reversing valve and the cylinder pin oil cylinder.

[0016] Optionally, the adjusting mechanism comprises a fourth reversing valve, and the first oil port and the second oil port of the fourth reversing valve are connected to the accumulator and the core tube of the first hydraulic cylinder respectively.

[0017] In the second aspect, the application provides a crane comprising the crane single-cylinder pin telescopic system.

[0018] Compared with the prior art, the application has the following beneficial effects:

[0019] The crane single-cylinder pin telescopic system and the crane provided by the application have the following advantages: (1) the pressure oil in the rod cavity of the first hydraulic cylinder is input into the accumulator as the hydraulic oil source for pulling out the cylinder pin and the arm pin, and the oil pump for controlling the oil supply of the cylinder pin and the arm pin is cancelled, thereby reducing the energy consumption of the system; (2) the core tube of the first hydraulic cylinder is only used as an oil return passage for the pin pulling-out system, and no longer bears high-pressure oil, so that the light-weight design can be realized and the reliability can be ensured; and (3) the control mechanism ensures the responsiveness of the opening of the first hydraulic cylinder at different oil temperatures, reduces the impact and improves the stability of the opening of the balance valve. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a hydraulic principle schematic diagram of an existing telescopic system provided in the background art;

[0021] Figure 2 This is a schematic diagram of a single-cylinder latch extension system for a crane provided in Example 1 of the present invention;

[0022] The following are marked in the figure:

[0023] 11. Variable hydraulic pump, 14. Hydraulically controlled proportional reversing valve, 19. First cylinder pin cylinder, 110. First arm pin cylinder, 111. Telescopic cylinder, 112. First core tube, 113. Cylinder arm pin switching valve, 115. First accumulator, 116. Reversing valve, 117. Dosing pump;

[0024] 1. Hydraulic oil tank, 2. Reversing mechanism, 21. Hydraulic pump, 22. First reversing valve, 23. First pressure reducing valve, 24. Second pressure reducing valve, 25. Second overflow valve, 26. Third overflow valve, 27. Double check valve, 3. First hydraulic cylinder, 4. Adjusting mechanism, 41. Accumulator, 42. Fourth overflow valve, 43. Second reversing valve, 44. Third reversing valve, 45. Sequence valve, 46. Ball valve, 47. Quick connector, 48. Fourth reversing valve, 5. Second hydraulic cylinder, 51. Arm pin cylinder, 52. Cylinder pin cylinder, 6. Balancing valve, 7. Control mechanism, 71. First solenoid valve, 72. Second solenoid valve, 73. Pressure differential control valve, 74. First damping valve, 75. Second damping valve, 76. Third damping valve, 77. Fourth damping valve, 78. Fifth damping valve, 79. First overflow valve. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0026] Example 1:

[0027] like Figure 2 As shown, the present invention provides a single-cylinder latch telescopic system for a crane, comprising a hydraulic oil tank 1, a reversing mechanism 2, a first hydraulic cylinder 3, an adjusting mechanism 4 and a second hydraulic cylinder 5 connected in sequence; the first hydraulic cylinder 3 is used to drive the telescopic arm of the crane, and the reversing mechanism 2 is used to switch the connecting oil circuit between the hydraulic oil tank 1 and the first hydraulic cylinder 3; the second hydraulic cylinder 5 includes an arm pin cylinder 51 and a cylinder pin cylinder 52, which are respectively used to drive the arm pin pulling mechanism and the cylinder pin pulling mechanism of the crane, and the adjusting mechanism 4 is used to control the communication relationship between the first hydraulic cylinder 3 and the arm pin cylinder 51 and the cylinder pin cylinder 52.

[0028] (1) Wherein, the reversing mechanism 2 and the first hydraulic cylinder 3 are further provided with a balance valve 6 and a control mechanism 7, the oil inlet and the oil outlet of the balance valve 6 are connected in series between the reversing mechanism 2 and the rodless cavity of the first hydraulic cylinder 3; the control mechanism 7 comprises a first electromagnetic valve 71, a second electromagnetic valve 72, a differential pressure control valve 73, a first damping valve 74, a second damping valve 75, a third damping valve 76, a fourth damping valve 77, a fifth damping valve 78 and a first overflow valve 79; (the first electromagnetic valve 71 is a normally open two-position two-way valve, and the second electromagnetic valve 72 is a normally closed two-position two-way valve) the control oil port of the balance valve 6 is connected to the hydraulic oil tank 1, the core pipe of the first hydraulic cylinder 3 and the first oil port of the first overflow valve 79 through the first damping valve 74, and the second oil port of the first overflow valve 79 is connected to the rodless cavity of the first hydraulic cylinder 3; the control oil port of the balance valve 6 is connected to the first oil port and the second oil port of the first electromagnetic valve 71 and the second electromagnetic valve 72, the rod cavity of the first hydraulic cylinder 3 and the pressure regulating port of the differential pressure control valve 73 through the second damping valve 75; the control oil port of the balance valve 6 is connected to the third oil port of the first electromagnetic valve 71 and the second electromagnetic valve 72 through the third damping valve 76 and the fourth damping valve 77; the control oil port of the balance valve 6 is connected to the fourth oil port of the first electromagnetic valve 71 and the second electromagnetic valve 72; the first oil port of the differential pressure control valve 73 is connected to the rod cavity of the first hydraulic cylinder 3 through the fifth damping valve 78, and the second oil port of the differential pressure control valve 73 is connected to the hydraulic oil tank 1.

[0029] The working principle of the balance valve 6 and the control mechanism 7 is as follows:

[0030] When the first hydraulic cylinder 3 with the boom retracts at the start, the opening of the balance valve 6 often causes the boom to suddenly sink due to instantaneous full opening, or the boom retraction has no response for a long time due to slow opening response.

[0031] The oil circuit for controlling the opening of the balance valve through the control mechanism 7 controls the speed and opening size of the balance valve.

[0032] 1) When the instantaneous pressure impact is large, the differential pressure between the two ends of the fifth damping valve 78 is large, the differential pressure control valve 73 is opened, and the instantaneous impact is reduced.

[0033] 2) When the oil temperature is low, the differential pressure between the two ends of the second damping valve 75 is large, the second electromagnetic valve 72 is opened, oil is supplied to the pilot port of the balance valve 6, the flow is increased, and the opening response of the balance valve 6 is improved.

[0034] 3) When the oil temperature is particularly high, the differential pressure between the two ends of the second damping valve 75 is small, the first electromagnetic valve 71 is closed, no oil is supplied to the pilot port of the balance valve 6, the flow is reduced, and the opening response of the balance valve is reduced to reduce the impact.

[0035] 4) The third damping valve 76 and the fourth damping valve 77 are used to reduce the pressure impact of the outlet of the first electromagnetic valve 71 and the second electromagnetic valve 72. The first damping valve 74 bypasses the return oil to the hydraulic tank 1, which is used to reduce the impact of the pilot port of the balance valve 6.

[0036] 5) The control mechanism ensures the responsiveness of the opening at different oil temperatures and reduces the impact to improve the smoothness of the opening of the balance valve 6.

[0037] (2) Wherein the reversing mechanism 2 comprises a hydraulic pump 21 and a first reversing valve 22, the first oil port of the first reversing valve 22 is connected to the hydraulic tank 1 through the hydraulic pump 21, the second oil port of the first reversing valve 22 is connected to the rodless cavity of the first hydraulic cylinder 3 through the balance valve 6, the third oil port and the fourth oil port of the first reversing valve 22 are connected to the hydraulic tank 1 and the rod cavity of the first hydraulic cylinder 3 respectively. The reversing mechanism 2 further comprises a pilot oil source, a first pressure reducing valve 23 and a second pressure reducing valve 24, the first oil ports of the first pressure reducing valve 23 and the second pressure reducing valve 24 are connected to the first control oil port and the second control oil port of the first reversing valve 22 respectively, and the second oil ports and the third oil ports of the first pressure reducing valve 23 and the second pressure reducing valve 24 are connected to the pilot oil source and the hydraulic tank 1.

[0038] The control principle of the reversing mechanism 2 and the first hydraulic cylinder 3 is as follows:

[0039] When the first pressure reducing valve 23 is powered, the oil output by the hydraulic pump 21 passes through the left position (the first oil port and the second oil port) of the first reversing valve 22, the balance valve 6 and enters the rodless cavity of the first hydraulic cylinder 3 in sequence, the oil in the rod cavity of the first hydraulic cylinder 3 returns through the third oil port and the fourth oil port of the first reversing valve 22, and the high-pressure oil pushes the piston rod to extend.

[0040] When the second pressure reducing valve 24 is powered, the oil output by the hydraulic pump 21 passes through the right position (the third oil port and the fourth oil port) of the first reversing valve 22, the balance valve 6 and enters the rod cavity of the first hydraulic cylinder 3 in sequence, the high-pressure oil pushes the balance valve 6 to reverse, the oil in the rodless cavity of the first hydraulic cylinder 3 returns, and the high-pressure oil in the rod cavity of the first hydraulic cylinder 3 pushes the piston rod to retract.

[0041] The size of the current input to the hydraulic pump 21 can change the displacement of the pump, thereby adjusting the speed of the first hydraulic cylinder 3 to meet the requirements of different working conditions of the telescopic system on the speed of the telescopic cylinder.

[0042] The reversing mechanism 2 further comprises a second overflow valve 25 and a third overflow valve 26, the first oil ports of the second overflow valve 25 and the third overflow valve 26 are connected to the hydraulic tank 1, and the second oil ports of the second overflow valve 25 and the third overflow valve 26 are connected to the second oil port and the fourth oil port of the first reversing valve 22 respectively. The second overflow valve 25 and the third overflow valve 26 control the maximum pressure in the rodless cavity and the rod cavity of the first hydraulic cylinder 3 respectively, so as to avoid damage to the telescopic cylinder caused by excessive system pressure.

[0043] The reversing mechanism 2 further comprises a double check valve 27 connected in series between the fourth oil port of the first reversing valve 22 and the rodless cavity of the first hydraulic cylinder 3. The double check valve 27 can keep the oil in the rodless cavity of the first hydraulic cylinder 3 at a certain pressure, thereby shortening the pressure building time of the rodless cavity of the first hydraulic cylinder 3 and improving the responsiveness.

[0044] (3) The adjusting mechanism 4 comprises an accumulator 41, a fourth overflow valve 42, a second reversing valve 43, a third reversing valve 44 and a sequence valve 45. The accumulator 41 is connected to the rodless cavity of the first hydraulic cylinder 3, the first oil port of the second reversing valve 43 and the third reversing valve 44 and the first oil port of the sequence valve 45 respectively. The accumulator 41 is connected to the core tube of the first hydraulic cylinder 3, the second oil port of the second reversing valve 43 and the third reversing valve 44 through the fourth overflow valve 42 respectively. The third oil port of the second reversing valve 43 is connected to the cylinder pin oil cylinder 52. The third oil port of the third reversing valve 44 is connected to the second oil port of the sequence valve 45. The third oil port of the sequence valve 45 is connected to the arm pin oil cylinder 51. The control oil port of the sequence valve 45 is connected to the core tube of the first hydraulic cylinder 3.

[0045] The control principle of the adjusting mechanism 4 and the second hydraulic cylinder 5 is as follows:

[0046] When the first hydraulic cylinder 3 performs the retraction action, the high-pressure oil in the rodless cavity charges the accumulator 41. The accumulator 41, after being charged, serves as the oil source of the second hydraulic cylinder 5. The third reversing valve 44 and the second reversing valve 43 control the on-off between the accumulator 41 and the arm pin oil cylinder 51 and the cylinder pin oil cylinder 52 respectively.

[0047] When the third reversing valve 44 is powered and the second reversing valve 43 is not powered, the high-pressure oil in the accumulator 41 enters the arm pin oil cylinder 51 through the third reversing valve 44 and the left position (the second oil port and the third oil port) of the sequence valve 45. The oil pushes the piston rod of the arm pin oil cylinder 51 to extend, and pushes the arm pin pulling mechanism to move, thereby realizing the arm pin pulling action.

[0048] When the second reversing valve 43 is powered and the third reversing valve 44 is not powered, the high-pressure oil in the accumulator 41 enters the cylinder pin oil cylinder 52 through the second reversing valve 43. The oil pushes the piston rod of the cylinder pin oil cylinder 52 to extend, and pushes the cylinder pin pulling mechanism to move, thereby realizing the cylinder pin pulling action.

[0049] When the arm pin is pulled in an emergency, the system pressure is raised, the sequence valve 45 is reversed, the high-pressure oil enters the arm pin oil cylinder 51, and the arm pin pulling action is realized.

[0050] When the second reversing valve 43 or the third reversing valve 44 loses power, the cylinder pin oil cylinder 52 or the arm pin oil cylinder 51 is reset under the action of the spring, and the large cavity oil of the cylinder pin oil cylinder 52 or the arm pin oil cylinder 51 is discharged through the core pipe in the first hydraulic cylinder 3. Since the core pipe directly communicates the hydraulic oil tank with the cylinder pin oil cylinder 52 and the arm pin oil cylinder 51, the oil circuit discharge resistance is small, and the release of the cylinder pin and the arm pin is fast.

[0051] The adjusting mechanism 4 includes a ball valve 46 and a quick connector 47, which are connected in series between the third working oil port of the second reversing valve 43 and the cylinder pin oil cylinder 52. When the emergency cylinder pin is pulled out, the ball valve 46 is closed, a high-pressure oil source is connected through the quick connector 47, the high-pressure oil reaches the cylinder pin oil cylinder 52, and the emergency cylinder pin is pulled out.

[0052] The adjusting mechanism 4 includes a fourth reversing valve 48, and the first oil port and the second oil port of the fourth reversing valve 48 are connected to the accumulator 41 and the core pipe of the first hydraulic cylinder 3, respectively. When the accumulator 41 is maintained or replaced, or the second reversing valve 43 and the third reversing valve 44 are maintained, the fourth reversing valve 48 is powered on, the high-pressure oil in the accumulator 41 is released, and the safety of the cylinder pin system during maintenance is ensured.

[0053] In addition, a pressure sensor can also be connected to the accumulator 41. When the pressure in the accumulator 41 is too high due to temperature rise or abnormal system pressure, the high-pressure oil will overflow from the fourth overflow valve 42, protecting the cylinder arm pin system from damage. When the pressure is lower than the set value, the system automatically charges the accumulator 41.

[0054] A one-way valve is arranged on the connecting oil circuit of the accumulator 41 and the rod cavity of the first hydraulic cylinder 3, and the flow direction of the one-way valve is from the accumulator 41 to the rod cavity of the first hydraulic cylinder 3. The one-way valve separates the rod cavity of the first hydraulic cylinder 3 from the accumulator 41, realizes that the high-pressure oil in the rod cavity of the first hydraulic cylinder 3 charges the accumulator 41, and avoids that the high-pressure oil in the accumulator 41 enters the rod cavity of the first hydraulic cylinder 3.

[0055] Embodiment two:

[0056] Based on embodiment one, the embodiment of the present application provides a crane, which comprises the crane single-cylinder pin telescopic system. The positive technical effects of the crane single-cylinder pin telescopic system in the above embodiments are also applicable to the crane, and will not be repeated here.

[0057] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, and these improvements and modifications should be considered as the protection scope of the present application.

Claims

1. A crane single cylinder latch telescopic system, characterized in that: It includes a hydraulic oil tank, a reversing mechanism, a first hydraulic cylinder, an adjusting mechanism, and a second hydraulic cylinder connected in sequence; the first hydraulic cylinder is used to drive the telescopic arm of the crane, and the reversing mechanism is used to switch the connecting oil circuit between the hydraulic oil tank and the first hydraulic cylinder; the second hydraulic cylinder includes an arm pin cylinder and a cylinder pin cylinder, which are respectively used to drive the arm pin pulling mechanism and cylinder pin pulling mechanism of the crane; the adjusting mechanism is used to control the communication relationship between the first hydraulic cylinder and the arm pin cylinder and the cylinder pin cylinder; The jack-up plate of the hydraulic cylinder is provided with a first hydraulic cylinder, and the jack-up plate of the hydraulic cylinder is provided with a first hydraulic cylinder, and the jack-up plate of the hydraulic cylinder is provided with a second ... rod chamber; the control oil port of the balancing valve is connected to the first oil port and the second oil port of the first solenoid valve and the second solenoid valve, the rod chamber of the first hydraulic cylinder and the pressure regulating port of the pressure differential control valve through the second damping valve; the control oil port of the balancing valve is connected to the third oil port of the first solenoid valve and the second solenoid valve through the third damping valve and the fourth damping valve; the control oil port of the balancing valve is connected to the fourth oil port of the first solenoid valve and the second solenoid valve; the first oil port of the pressure differential control valve is connected to the rod chamber of the first hydraulic cylinder through the fifth damping valve, and the second oil port of the pressure differential control valve is connected to the hydraulic oil tank; The regulating mechanism includes an accumulator, a fourth overflow valve, a second reversing valve, a third reversing valve and a sequence valve. The accumulator is respectively connected to the rod chamber of the first hydraulic cylinder, the first oil ports of the second reversing valve and the third reversing valve, and the first oil port of the sequence valve. The accumulator is respectively connected to the core tube of the first hydraulic cylinder, the second oil ports of the second reversing valve and the third reversing valve through the fourth overflow valve. The third oil port of the second reversing valve is connected to the cylinder pin cylinder. The third oil port of the third reversing valve is connected to the second oil port of the sequence valve. The third oil port of the sequence valve is connected to the arm pin cylinder. The control oil port of the sequence valve is connected to the core tube of the first hydraulic cylinder.

2. A crane single cylinder latch extension system according to claim 1, characterized in that: The first solenoid valve is a normally open two-position two-way valve, and the second solenoid valve is a normally closed two-position two-way valve.

3. The crane single cylinder latch extension system according to claim 1, characterized in that: The reversing mechanism includes a hydraulic pump and a first reversing valve, the first oil port of the first reversing valve is connected to the hydraulic oil tank through the hydraulic pump, the second oil port of the first reversing valve is connected to the rodless chamber of the first hydraulic cylinder through a balancing valve, and the third oil port and the fourth oil port of the first reversing valve are respectively connected to the hydraulic oil tank and the rod chamber of the first hydraulic cylinder.

4. The crane single cylinder latch extension system according to claim 3, characterized in that: The reversing mechanism also includes a pilot oil source, a first pressure reducing valve and a second pressure reducing valve, the first oil ports of the first pressure reducing valve and the second pressure reducing valve are respectively connected to the first control oil port and the second control oil port of the first reversing valve, and the second oil port and the third oil port of the first pressure reducing valve and the second pressure reducing valve are respectively connected to the pilot oil source and the hydraulic oil tank.

5. The crane single cylinder latch extension system according to claim 3, characterized in that: The reversing mechanism also includes a second overflow valve and a third overflow valve, the first oil ports of the second overflow valve and the third overflow valve are both connected to the hydraulic oil tank, and the second oil ports of the second overflow valve and the third overflow valve are respectively connected to the second oil port and the fourth oil port of the first reversing valve.

6. The crane single cylinder latch extension system according to claim 3, characterized in that: The reversing mechanism further includes a double one-way valve, which is connected in series between the fourth oil port of the first reversing valve and the rod chamber of the first hydraulic cylinder.

7. The crane single cylinder latch extension system according to claim 1, characterized in that: The regulating mechanism includes a ball valve and a quick-connect joint, and the ball valve and the quick-connect joint are connected in series between the third working oil port of the second reversing valve and the cylinder pin oil cylinder.

8. The crane single cylinder latch extension system according to claim 1, characterized in that: The regulating mechanism includes a fourth reversing valve, wherein a first oil port and a second oil port of the fourth reversing valve are respectively connected to an accumulator and a core tube of the first hydraulic cylinder.

9. A crane, characterized in that: It comprises a crane single-cylinder latch telescopic system as described in any one of claims 1-8.

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