A single cylinder draw bolt crane arm pin release noise reduction system and method

Abstract

The application discloses a single-cylinder bolt type crane arm pin release noise reduction system and method, and relates to the field of crane arm pin release noise reduction. The system comprises a cylinder arm pin telescopic mechanism, an oil supply component, a telescopic oil cylinder, a first pressure regulating component, a second pressure regulating component, a back pressure mechanism, a controller and a measuring element. The cylinder arm pin telescopic mechanism comprises a cylinder pin oil cylinder and an arm pin oil cylinder. The cylinder pin oil cylinder and the arm pin oil cylinder are connected with the telescopic oil cylinder for pulling out and releasing the cylinder pin and the arm pin. The telescopic oil cylinder is connected with the oil supply component and connected with the cylinder arm pin telescopic mechanism through an internal core pipe. The oil supply component comprises a hydraulic pump and a first electromagnetic reversing valve. The first pressure regulating component is arranged in the oil supply component, and the back pressure mechanism is arranged between the first electromagnetic reversing valve and a hydraulic oil tank. The controller controls the opening and closing of the cylinder arm pin telescopic mechanism and each component according to the feedback data of the measuring element, is used for pulling out the arm pin, and controls the arm pin release process. The system and the method can reduce the arm pin release noise and offset the impact force of the arm pin release.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of telescopic cranes, in particular to a single-cylinder bolt type crane arm pin release noise reduction system and method. BACKGROUND

[0002] The crane single-cylinder bolt type telescopic system can realize more than five-section arm extension and retraction, meet the design requirements of the crane for long arm length, and is widely used in medium and large tonnage cranes with five-section arms or more. Since there is friction between the inner arm section and the outer section driven by the telescopic oil cylinder when the arm is extended and retracted, the inner arm section is extended while driving the outer section to move forward, and the arm pin disc provided on the outer section is offset relative to the inner section. At this time, if the arm pin release position is determined by measuring the displacement of the telescopic oil cylinder, the arm pin cannot be accurately inserted into the arm pin disc of the outer section, resulting in that the inner and outer arm sections cannot be locked by the arm pin.

[0003] To solve the problem of unsuccessful insertion of the arm pin in the single-cylinder telescopic system, the arm pin is released in advance. When the arm pin is released in advance, the high-pressure oil in the arm pin cylinder is unloaded through the first electromagnetic reversing valve, and the cylinder arm pin mechanism has a restoring tendency under the action of the spring force. At this time, the arm pin is pressed on the outer section under the action of the restoring force provided by the cylinder arm pin mechanism and the arm pin spring. When the arm pin slides to the arm pin disc of the outer section, the arm pin is completely released under the action of the restoring force, and the arm pin hits the arm pin seat. Since the stiffness of the arm pin spring and the cylinder arm pin mechanism spring is large, the restoring force acting on the arm pin is large, so that when the arm pin is completely released, a strong instantaneous impact is generated on the arm pin seat, the noise of the arm pin release impact is large, and the strong impact may cause damage to the arm pin seat and the arm pin structure, resulting in safety risks. In view of the above risks, the existing technical personnel adds a damping cylinder or measures the displacement of the telescopic oil cylinder to release the arm pin at the desired position. Although the addition of the damping cylinder can play a buffering role when the arm pin is released, due to the complex structure of the arm, the buffering reliability of the damping cylinder alone is low, and the production and maintenance costs are high. Secondly, since there is friction between the arms when the arm is extended and retracted, the arm pin disc position will change due to the arm movement, and the arm processing precision and the arm friction are required to be high, so that it is difficult to realize the release of the arm pin at the desired position by measuring the displacement of the telescopic oil cylinder, which may cause the failure of the arm pin release. SUMMARY

[0004] The present application provides a single-cylinder bolt type crane arm pin release noise reduction system and method, which aims to solve the problem of large impact noise when the arm pin of the single-cylinder bolt type crane telescopic system is released, and reduce the risk of damage to the arm pin due to impact.

[0005] To achieve the above-mentioned purpose / in order to solve the above-mentioned technical problems, the present application is realized by adopting the following technical scheme:

[0006] A single-cylinder bolt-type crane arm pin release noise reduction system comprises:

[0007] A cylinder arm pin telescopic mechanism, an oil supply component, a telescopic oil cylinder, a first pressure regulating component, a second pressure regulating component, a back pressure mechanism, a controller and a measuring element;

[0008] The cylinder arm pin telescopic mechanism comprises a cylinder pin oil cylinder and an arm pin oil cylinder, which are respectively connected with the telescopic oil cylinder to provide power for the cylinder arm pin mechanism and control the pulling out and release of the cylinder pin and the arm pin.

[0009] The telescopic oil cylinder is connected with the oil supply component and the cylinder arm pin telescopic mechanism through the core pipe inside the telescopic oil cylinder to provide hydraulic power for the cylinder arm pin telescopic mechanism.

[0010] The oil supply component comprises a hydraulic pump and a first electromagnetic reversing valve, and the first electromagnetic reversing valve is arranged at the oil outlet of the hydraulic pump to control the hydraulic oil provided by the hydraulic pump to the core pipe inside the telescopic oil cylinder and the cylinder arm pin telescopic mechanism.

[0011] The first pressure regulating component is arranged in the oil supply component to limit the oil supply pressure of the hydraulic system, and the second pressure regulating component is arranged between the oil supply component and the telescopic oil cylinder to limit the pressure of the core pipe inside the telescopic oil cylinder and the cylinder arm pin telescopic mechanism.

[0012] The back pressure mechanism is arranged between the first electromagnetic reversing valve and the hydraulic oil tank to limit the unloading pressure of the hydraulic system.

[0013] The measuring element comprises a temperature sensor arranged on the oil circuit, a length measuring sensor arranged on the arm pin and a position detection switch, and is used to feed back the oil temperature of the hydraulic system and the movement position, release position and displacement of the arm pin to the controller.

[0014] The controller controls the power-on or power-off of the oil supply component, the first pressure regulating component, the second pressure regulating component and the back pressure mechanism according to the feedback data of the measuring element, controls the pulling out of the arm pin by the cylinder arm pin mechanism, the early release of the arm pin after the arm pin is pulled out, and the pressure increase of the arm pin oil cylinder after the release, so that the arm pin is released from low speed, buffered and released completely, and the arm pin oil cylinder is unloaded through the back pressure mechanism to reduce the release noise of the arm pin and offset the release impact force of the arm pin.

[0015] Optionally, the back pressure mechanism comprises a first one-way valve, a second one-way valve and a fourth electromagnetic reversing valve.

[0016] The oil inlet of the first one-way valve is connected with the oil outlet of the first electromagnetic reversing valve, and the oil outlet of the first one-way valve is connected with the hydraulic oil tank; the oil inlet of the second one-way valve is connected with the oil outlet of the first electromagnetic reversing valve through the fourth electromagnetic reversing valve, and the oil outlet of the second one-way valve is connected with the hydraulic oil tank; the pressure threshold values of the first one-way valve and the second one-way valve are p4 and p5 respectively.

[0017] Optionally, the first pressure regulating component is a first overflow valve, and the pressure threshold value of the first overflow valve is p1.

[0018] Optionally, the second pressure regulating component comprises a second overflow valve, a third overflow valve and a second electromagnetic reversing valve.

[0019] The second overflow valve is arranged between the hydraulic oil tank and the telescopic oil cylinder, and the third overflow valve is arranged between the hydraulic oil tank and the telescopic oil cylinder through the second electromagnetic reversing valve; the pressure threshold values of the second overflow valve and the third overflow valve are p2 and p3 respectively.

[0020] Optionally, the pressure relationship between the first overflow valve, the second overflow valve, the third overflow valve, the first one-way valve and the second one-way valve is p1>p2>p3>p4>p5.

[0021] Optionally, the core pipe is connected with the cylinder pin oil cylinder and the arm pin oil cylinder through a cylinder arm pin switching valve, and the cylinder arm pin switching valve is a third electromagnetic reversing valve.

[0022] Optionally, the cylinder arm pin mechanism comprises a cylinder pin, an arm pin pulling mechanism and a spring mechanism, and the spring mechanism is arranged at the cylinder pin and the arm pin pulling mechanism respectively; the spring mechanism is used for providing a reset force for the cylinder pin and the arm pin.

[0023] A single-cylinder bolt type crane arm pin release noise reduction method based on the above noise reduction system, the noise reduction method comprising:

[0024] The controller controls the oil supply component to supply oil to the core pipe and the cylinder arm pin telescopic mechanism in the telescopic oil cylinder, and controls the first pressure regulating component and the second pressure regulating component to be opened at the same time, so as to drive the arm pin oil cylinder in the cylinder arm pin telescopic mechanism to stretch out to the right and drive the arm pin pulling mechanism in the cylinder arm pin mechanism to pull out the arm pin; and the controller receives the arm pin movement position, the release position and the release displacement in real time; wherein, after the arm pin is pulled out, the inner segment arm and the outer segment arm are unlocked, the telescopic oil cylinder drives the inner segment arm to stretch out, and the arm pin moves out with the inner segment arm.

[0025] When the arm pin reaches the preset position, the controller controls the first electromagnetic reversing valve to lose power, the arm pin oil cylinder is unloaded by the core pipe inside the telescopic oil cylinder and the first electromagnetic reversing valve to the back pressure mechanism, so that the arm pin oil cylinder retracts, and the arm pin is released in advance and at low speed by the pulling arm pin mechanism in the cylinder arm pin mechanism, and the arm pin slides at low speed against the outside of the outer section arm under the action of the spring mechanism and the cylinder arm pin mechanism and slides with the telescopic oil cylinder;

[0026] When the arm pin is released at low speed, the controller controls the first electromagnetic reversing valve of the oil supply component and the second electromagnetic reversing valve of the second pressure regulating component to obtain power according to the displacement of the arm pin release, so as to pressurize the arm pin oil cylinder and output thrust to the arm pin, so as to offset part of the arm pin reset force, so that the arm pin slides against the outer section arm under the action of the cylinder arm pin mechanism with slightly low reset force, and the arm pin is released in buffer mode.

[0027] When the arm pin is released in buffer mode, the controller controls the arm pin to maintain buffer release or controls the oil supply component to lose power according to the release position of the arm pin.

[0028] Optionally, when the arm pin is released in buffer mode, the controller controls the arm pin to maintain buffer release or controls the oil supply component to lose power according to the release position of the arm pin, comprising:

[0029] When the release position of the arm pin reaches the arm pin disc of the outer section arm, the pressure in the arm pin oil cylinder is maintained at p3, and the arm pin continues to be released in buffer mode.

[0030] When the release position of the arm pin reaches the complete release state position, the first electromagnetic valve is controlled to lose power, the hydraulic pump stops oil supply, the oil in the arm pin oil cylinder is completely unloaded through the first electromagnetic valve and the back pressure mechanism, and the arm pin reaches the complete release state.

[0031] Optionally, the noise reduction method further comprises receiving the temperature of the hydraulic system oil circuit in real time.

[0032] According to the temperature of the hydraulic system oil circuit, the back pressure mechanism is controlled to unload at different pressures; specifically:

[0033] When the temperature of the hydraulic system oil circuit is higher than the preset value, the controller controls the fourth electromagnetic reversing valve to lose power, and the back pressure mechanism provides a back pressure of p4.

[0034] When the temperature of the hydraulic system oil circuit is lower than the preset value, the controller controls the fourth electromagnetic reversing valve to obtain power, and the back pressure mechanism provides a back pressure of p5.

[0035] Compared with the prior art, the present application has the following beneficial effects:

[0036] In this invention, the arm pin cylinder is pressurized after early release, so that during the buffered release of the arm pin, the arm pin is first rapidly released under the restoring force provided by the arm pin spring and the cylinder-arm pin mechanism, inserting into the arm pin plate. However, at this time, the arm pin does not collide with the arm pin seat. Then, the arm pin cylinder is unloaded with a certain back pressure, and the arm pin contacts the arm pin plate, slowly and completely releasing the arm pin. In this solution, the arm pin release process can reduce the noise of arm pin release and reduce the risk of damage to the arm pin structure.

[0037] By setting the unloading back pressure for the boom pin release, multiple unloading back pressures are provided for early and full release of the boom pin, adapting to the influence of different ambient temperatures on the boom pin release speed and reducing the impact noise of early release of the boom pin on the external boom. Attached Figure Description

[0038] Figure 1 This is a structural diagram of the arm pin release noise reduction system of the present invention.

[0039] Figure 2 This is an embodiment diagram of the cylinder pin, arm pin, and outer arm of the present invention.

[0040] Figure 3 This is a schematic diagram of the arm pin release process of the present invention.

[0041] Figure 4 This is a schematic diagram of the arm pin reset force curve at different stages of the arm pin release noise reduction system of the present invention.

[0042] In the diagram: 1-Hydraulic pump; 2-First relief valve; 3-First solenoid directional valve; 4-Second relief valve; 5-Third relief valve; 6-Second solenoid directional valve; 7-Telescopic cylinder; 7.1-Core tube; 8-Cylinder arm pin switching valve; 8.1-Third solenoid directional valve; 9-Arm pin bolt; 10-Cylinder arm pin mechanism; 11-Cylinder pin cylinder; 12-Arm pin cylinder; 13-Cylinder pin; 14-Back pressure mechanism valve; 14.1-First check valve; 14.2-Second check valve; 14.3-Fourth solenoid directional valve; 15-Hydraulic oil tank; 1a-Outer arm; 2a-Arm pin; 3a-Inner arm; 4a-Arm pin disc; 5a-Cylinder head body; 7a-Arm pin seat; 8a-Length measuring sensor; 9a-Arm pin spring. Detailed Implementation

[0043] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention. Example

[0044] like Figure 1 The single-cylinder pin-type crane boom pin 2a release noise reduction system shown includes: boom pin telescopic mechanism, oil supply component, telescopic cylinder 7, first pressure regulating component, second pressure regulating component, back pressure mechanism 14, controller, and measuring element.

[0045] The cylinder arm pin telescopic mechanism comprises a cylinder pin oil cylinder 11, an arm pin oil cylinder 12, and a cylinder arm pin mechanism 10. The cylinder pin oil cylinder 11 and the arm pin oil cylinder 12 are respectively connected with the core pipe 7.1 of the telescopic oil cylinder 7. The power end of the cylinder pin oil cylinder 11 and the arm pin oil cylinder 12 is respectively connected with the cylinder arm pin mechanism 10. The cylinder arm pin mechanism 10 is provided with a cylinder pin, an arm pin pulling mechanism, and a spring mechanism. The cylinder pin oil cylinder 11 and the arm pin oil cylinder 12 control the pulling and releasing of the cylinder pin 13 and the arm pin 2a in the cylinder arm pin mechanism 10. The spring mechanism is respectively arranged at the cylinder pin and the arm pin pulling mechanism to provide a restoring force for the cylinder pin and the arm pin.

[0046] The arm pin is arranged at the rear end of the arm of the section. The arm pin is smoothly inserted into the arm pin disc through the restoring force of the arm pin spring 9a, the connection and locking of the inner and outer arms are realized, and the cylinder arm pin mechanism 10, the cylinder pin oil cylinder 11, and the arm pin oil cylinder 12 are arranged on the telescopic oil cylinder and move with the telescopic oil cylinder. The function of the arm pin oil cylinder 12 is to drive the cylinder arm pin mechanism 10 to overcome the spring in the cylinder arm pin mechanism 10 and the arm pin spring 9a on the arm pin, pull the arm pin, and realize the locking and unlocking of the inner and outer arms. The function of the cylinder pin oil cylinder 11 is to drive the cylinder arm pin mechanism to overcome the spring mechanism in the cylinder arm pin mechanism, pull the cylinder pin, and unlock the telescopic oil cylinder 7 and the inner arm 3a. Therefore, by controlling the oil inlet and oil return of the cylinder pin oil cylinder 11 and the arm pin oil cylinder 12, the telescoping of the cylinder pin and the arm pin is realized, and the locking and unlocking between the inner and outer arms are realized.

[0047] The telescopic oil cylinder 7 is connected with the oil supply component and connected with the cylinder arm pin telescopic mechanism through the core pipe 7.1 in the telescopic oil cylinder 7, which is used to provide hydraulic power for the cylinder arm pin telescopic mechanism. Meanwhile, the telescopic oil cylinder 7 is also connected with each arm, including the inner arm 3a and the outer arm 1a, which is used to drive the inner arm 3a to move relative to the outer arm to realize the extension and retraction of the arm.

[0048] The oil supply component comprises a hydraulic pump 1 and a first electromagnetic reversing valve 3. The first electromagnetic reversing valve 3 is arranged between the hydraulic pump 1 and the telescopic oil cylinder 7. The oil inlet of the first electromagnetic reversing valve 3 is connected with the oil outlet of the hydraulic pump 1, and the other oil port of the first electromagnetic reversing valve 3 is connected with the telescopic oil cylinder 7. The first electromagnetic reversing valve 3 is used to control the hydraulic oil provided by the hydraulic pump 1 to the telescopic oil cylinder 7 and the cylinder arm pin telescopic mechanism. The first electromagnetic reversing valve 3 is also arranged between the telescopic oil cylinder 7, the cylinder arm pin telescopic mechanism, and the back pressure mechanism 14, which is used to unload the telescopic oil cylinder 7 and the arm pin oil cylinder 12 to the back pressure mechanism 14.

[0049] The first pressure regulating component is arranged between the oil supply component, specifically the hydraulic pump 1 and the first electromagnetic reversing valve 3, which can limit the oil supply pressure of the hydraulic system. The second pressure regulating component is arranged between the oil supply component and the telescopic oil cylinder 7, which can limit the pressure in the telescopic oil cylinder 7 and the arm pin oil cylinder 12.

[0050] The back pressure mechanism 14 is arranged between the first electromagnetic reversing valve 3 and the hydraulic oil tank 15, and can limit the unloading pressure of the hydraulic system.

[0051] The measurement elements include temperature sensors, length measurement sensors 8a, and position detection switches. The number and position of the temperature sensors can be changed according to the system model, and the temperature sensors are arranged on any oil passage of the noise reduction system. The length measurement sensors 8a and the position detection switches are arranged on the arm pin 2a, and can feed back the oil temperature of the hydraulic system, the movement position of the arm pin 2a, the release position of the arm pin 2a, and the displacement to the controller.

[0052] The controller controls the oil supply component, the first pressure regulating component, the second pressure regulating component, and the back pressure mechanism 14 to be powered on or powered off according to the feedback data of the measurement elements. The controller controls the cylinder arm pin extension mechanism to pull out the arm pin 2a, controls the arm pin oil cylinder 12 to be pressurized after the arm pin 2a is pulled out, controls the arm pin 2a to be released in advance after the arm pin 2a is pulled out, and controls the arm pin oil cylinder 12 to be pressurized after the arm pin 2a is released, so that the arm pin 2a is released from low speed, buffer release, and complete release, and the back pressure mechanism 14 is used to unload the arm pin oil cylinder 12, so as to reduce the release noise of the arm pin 2a and offset the release impact force of the arm pin 2a.

[0053] Preferably, the back pressure mechanism 14 includes a first one-way valve 14.1, a second one-way valve 14.2, and a fourth electromagnetic reversing valve 14.3. The oil inlet of the first one-way valve 14.1 is connected with the oil outlet of the first electromagnetic reversing valve 3, and the oil outlet of the first one-way valve 14.1 is connected with the hydraulic oil tank 15. The oil inlet of the second one-way valve 14.2 is connected with the oil outlet of the first electromagnetic reversing valve 3 through the fourth electromagnetic reversing valve 14.3, and the oil outlet of the second one-way valve 14.2 is connected with the hydraulic oil tank 15. The pressure threshold values of the first one-way valve 14.1 and the second one-way valve 14.2 are p4 and p5 respectively, so that different unloading pressures can be provided for the hydraulic system, and the use requirements of different working conditions and environments can be met.

[0054] Preferably, the first pressure regulating component is a first overflow valve 2, and the pressure threshold value of the first overflow valve 2 is p1.

[0055] Preferably, the second pressure regulating component includes a second overflow valve 4, a third overflow valve 5, and a second electromagnetic reversing valve 6. The second electromagnetic reversing valve 6 is in a closed state in normal state. The second overflow valve 4 is arranged between the extension cylinder 7 and the hydraulic oil tank 15, and the third overflow valve 5 is arranged between the hydraulic oil tank 15 and the extension cylinder 7 through the second electromagnetic reversing valve 6. The pressure threshold values of the second overflow valve 4 and the third overflow valve 5 are p2 and p3 respectively, so that the pressure of the core pipe 7.1 in the extension cylinder 7 and the cylinder arm pin extension mechanism can be limited, the arm pin oil cylinder 12 can be extended to the right under the action of the oil with the pressure of p2 to drive the cylinder arm pin extension mechanism to pull out the arm pin 2a, and the arm pin oil cylinder 12 can output a thrust force that can offset part of the reset force of the arm pin 2a under the action of the oil with the pressure of p3 to drive the arm pin 2a to release at low speed and then release with a slightly lower reset force.

[0056] Preferably, the pressure relationship between the first overflow valve 2, the second overflow valve 4, the third overflow valve 5, the first one-way valve 14.1, and the second one-way valve 14.2 is p1>p2>p3>p4>p5.

[0057] Preferably, the core pipe 7.1 is connected to the cylinder pin oil cylinder 11 and the arm pin oil cylinder 12 through the cylinder arm pin switching valve 8, and the cylinder arm pin switching valve 8 is a third electromagnetic reversing valve 8.1, which is used to switch the power output of the arm pin oil cylinder 12 and the cylinder pin oil cylinder 11.

[0058] The single-cylinder plug-in crane arm pin 2a release noise reduction system is used in cooperation with the single-cylinder plug-in telescopic system to reduce the telescopic noise of the single-cylinder plug-in telescopic system. The cylinder arm pin mechanism 10, the cylinder pin oil cylinder 11, and the arm pin oil cylinder 12 in the single-cylinder plug-in telescopic system are all arranged on the telescopic oil cylinder. The cylinder plug-in telescopic system mainly consists of an outer section arm 1a, an arm pin 2a, an inner section arm 3a, an arm pin disc 4a, a cylinder head body 5a, and an arm pin seat 7a. One end of the arm pin 2a is connected with an arm pin bolt 9 and moves with the arm pin 2a. The single-cylinder plug-in telescopic system is prior art and not a technical feature of the present invention, so it is not described in detail here.

[0059] As shown in the schematic diagram of the single-cylinder plug-in telescopic system Figure 2 As shown in the schematic diagram of the single-cylinder plug-in telescopic system

[0060] The arm pin 2a early release process is as follows Figure 3As shown in the figure, Figure a is the arm pin completely released, Figure b is the arm pin sliding, Figure c is the arm pin released in advance. The cylinder pin 13 on the cylinder head body 5a locks the telescopic oil cylinder 7 and the inner section arm 3a, and the telescopic hydraulic system drives the cylinder arm pin mechanism 10 on the cylinder head body 5a to pull out the inner section arm 3a between the arm pin telescopic arm and the outer section arm 1a. The telescopic oil cylinder 7 is extended, and the cylinder head body 5a on the telescopic oil cylinder 7 drives the inner section arm 3a to move forward. When the length measuring sensor 8a detects that the telescopic oil cylinder 7 moves a certain displacement, the hydraulic system is unloaded, the cylinder arm pin mechanism 10 releases the arm pin 2a in advance, and the arm pin 2a is pressed against the inside of the arm cylinder of the outer section arm 1a under the action of the arm pin spring 9a and the cylinder arm pin mechanism 10. Continue to slide forward with the output of the telescopic oil cylinder 7 and the cylinder arm pin mechanism 10. When the arm pin 2a slides to the position of the arm pin disc 4a of the outer section arm 1a, the arm pin 2a is completely released under the action of the force of the arm pin spring 9a and the cylinder arm pin mechanism 10. The arm pin 2a is inserted into the arm pin disc 4a of the outer section arm 1a, realizing the locking between the inner section arm 3a and the outer section arm 1a.

[0061] The existing arm pin 2a is released when the first electromagnetic reversing valve 3 is powered and the second electromagnetic reversing valve 6 is de-energized. The pressure oil provided by the hydraulic pump 1 passes through the core pipe 7.1 and the cylinder arm pin switching valve 8 to enter the arm pin oil cylinder 12, and the oil drives the arm pin oil cylinder 12 to extend, and then drives the cylinder arm pin mechanism 10 to move, and pulls out the arm pin 2a. When the first electromagnetic reversing valve 3 is de-energized and the second electromagnetic reversing valve 6 is de-energized, the high-pressure oil in the arm pin oil cylinder 12 is unloaded, and the arm pin oil cylinder 12 is retracted under the action of the spring restoring force of the cylinder arm pin mechanism 10, and the arm pin 2a is released. When the arm pin 2a is released in advance, the high-pressure oil in the arm pin oil cylinder 12 is unloaded through the first electromagnetic reversing valve 3, and the cylinder arm pin mechanism 10 has a restoring tendency under the action of the spring force. At this time, the arm pin 2a is pressed on the outer section arm 1a under the action of the restoring force provided by the cylinder arm pin mechanism 10 and the arm pin spring 9a. When the arm pin 2a slides to the arm pin disc 4a of the outer section arm 1a, the arm pin 2a is completely released under the action of the restoring force, and the arm pin 2a hits the arm pin seat 7a. Because the stiffness of the arm pin spring 9a and the spring of the cylinder arm pin mechanism 10 is large, the restoring force acting on the arm pin 2a is large, so when the arm pin 2a is completely released, a strong instantaneous impact is generated on the arm pin seat 7a, the release impact noise of the arm pin 2a is large, and the strong impact may cause damage to the structure of the arm pin seat 7a and the arm pin 2a, which may cause safety risks. Therefore, a noise reduction system is designed to reduce the noise of the telescopic system. Embodiment

[0062] The embodiment is based on the above-mentioned noise reduction system combined with Figure 4 Further illustrate the noise reduction method of the system, comprising:

[0063] The controller controls the oil supply part to supply oil to the core pipe 7.1 inside the telescopic oil cylinder 7, the cylinder arm pin telescopic mechanism, controls the first pressure regulating part and the second pressure regulating part to open at the same time, drives the arm pin oil cylinder 12 in the cylinder arm pin telescopic mechanism to extend to the right, drives the arm pin 2a in the cylinder arm pin mechanism to be pulled out, and controls the controller to receive the movement position, the release position and the release displacement of the arm pin 2a in real time. After the arm pin 2a is pulled out, the inner segment arm 3a and the outer segment arm 1a are unlocked, the telescopic oil cylinder 7 drives the inner segment arm 3a to extend, and the arm pin 2a extends and moves with the inner segment arm 3a.

[0064] After the arm pin 2a moves to the preset position, the controller controls the first electromagnetic reversing valve 3 to lose power, the arm pin oil cylinder 12 is unloaded through the core pipe 7.1 inside the telescopic oil cylinder 7 and the first electromagnetic reversing valve 3 to the back pressure mechanism 14, the arm pin oil cylinder 12 is retracted, the arm pin 2a is released in advance by the pulling arm pin mechanism in the cylinder arm pin mechanism, and the arm pin 2a slides on the inner side of the outer segment arm 1a at low speed and slides with the telescopic oil cylinder 7 under the action of the spring mechanism and the cylinder arm pin mechanism.

[0065] When the arm pin 2a is released at low speed, the controller controls the first electromagnetic reversing valve 3 of the oil supply part and the second electromagnetic reversing valve 6 of the second pressure regulating part to be powered according to the release displacement of the arm pin 2a, so as to pressurize the arm pin oil cylinder 12, make the arm pin oil cylinder 12 output thrust, offset part of the reset force of the arm pin 2a, make the arm pin 2a slide on the outer segment arm 1a at a slightly lower reset force under the joint action of the arm pin spring 9a and the cylinder arm pin mechanism 10, and achieve the buffer release of the arm pin 2a.

[0066] When the arm pin 2a is released at low speed, the controller controls the first electromagnetic reversing valve 3 of the oil supply part and the second electromagnetic reversing valve 6 of the second pressure regulating part to be powered according to the release displacement of the arm pin 2a, so as to pressurize the arm pin oil cylinder 12, make the arm pin oil cylinder 12 output thrust, offset part of the reset force of the arm pin 2a, make the arm pin 2a slide on the outer segment arm 1a at a slightly lower reset force under the joint action of the arm pin spring 9a and the cylinder arm pin mechanism 10, and achieve the buffer release of the arm pin 2a.

[0067] When the arm pin 2a is released to the arm pin disc 4a of the outer segment arm 1a, the pressure in the arm pin oil cylinder 12 is maintained at p3, and the arm pin 2a is released in buffer mode.

[0068] When the arm pin 2a is released to the completely released state position, the first electromagnetic valve loses power, the hydraulic pump 1 stops supplying oil, the oil in the arm pin oil cylinder 12 is completely unloaded through the first electromagnetic valve and the back pressure mechanism 14, and the arm pin 2a reaches the completely released state.

[0069] When the arm pin 2a is pulled out in the cylinder arm pin telescopic mechanism in this embodiment, the controller controls the first electromagnetic reversing valve 3 of the oil supply component to be powered on, and the hydraulic pump 1 outputs pressure oil which successively passes through the first electromagnetic reversing valve 3, the telescopic oil cylinder 7, and finally enters the arm pin oil cylinder 12, for driving the arm pin oil cylinder 12 in the cylinder arm pin telescopic mechanism to extend to the right, pulling out the arm pin 2a in the arm pin pulling-out mechanism in the cylinder arm pin mechanism 10, and the controller receives the movement position of the arm pin 2a, the release position of the arm pin 2a, and the release displacement in real time; wherein the first pressure regulating component controls the oil supply pressure to be p1, the second pressure regulating component controls the oil pressure in the arm pin oil cylinder 12 to be p2, and the arm pin oil cylinder 12 extends to the right under the action of the oil with the pressure p2, driving the cylinder arm pin mechanism 10 to pull out the arm pin 2a;

[0070] After the arm pin 2a is pulled out, the controller releases the arm pin 2a in advance according to the movement position of the arm pin 2a;

[0071] When the arm pin 2a is released in advance, the controller controls the first electromagnetic reversing valve 3 of the oil supply component to be powered off, and the pressure oil in the arm pin oil cylinder 12 passes through the telescopic oil cylinder 7 and the first electromagnetic reversing valve 3 to unload the back pressure mechanism 14, so that the arm pin 2a is released at low speed; wherein the back pressure mechanism 14 provides back pressure for returning oil with a pressure p4, and the arm pin oil cylinder 12 retracts; the low-speed release of the arm pin 2a is specifically that the arm pin 2a spring mechanism and the cylinder arm pin mechanism 10 act on the inner side of the outer segment arm 1a and slide with the telescopic oil cylinder 7;

[0072] When the arm pin 2a is released at low speed, the controller pressurizes the arm pin oil cylinder 12 according to the release displacement of the arm pin 2a, so as to output a thrust of the arm pin oil cylinder 12 for offsetting part of the reset force of the arm pin 2a;

[0073] When the arm pin oil cylinder 12 is pressurized, the controller controls the first electromagnetic reversing valve 3 of the oil supply component and the second electromagnetic reversing valve 6 of the second pressure regulating component to be powered on respectively, so that the pressure of the arm pin oil cylinder 12 increases; wherein after the first electromagnetic reversing valve 3 is powered on, the hydraulic pump 1 supplies oil to the cylinder arm pin telescopic mechanism, and after the second electromagnetic reversing valve 6 is powered on, the pressure P3 output by the second pressure regulating component makes the hydraulic pump 1 provide oil with a pressure p3 for the system, and the oil enters the arm pin oil cylinder 12 to output a thrust, and the thrust of the arm pin oil cylinder 12 offsets part of the reset force of the arm pin 2a; at this time, the arm pin 2a is in the joint action of the arm pin spring 9a and the cylinder arm pin mechanism 10, and is in sliding contact with the outer segment arm 1a at a slightly lower reset force, so as to further achieve the purpose of buffer release at low speed;

[0074] When the buffer release is performed, the controller controls the arm pin 2a to be buffer released or controls the oil supply component to be powered off according to the release position of the arm pin 2a;

[0075] When the arm pin 2a moves to the outer section arm 1a arm pin disc 4a with the telescopic oil cylinder movement 7, the arm pin 2a is released under the combined action of the arm pin spring 9a and the cylinder arm pin mechanism 10, and the arm pin 2a is inserted into the outer section arm 1a arm pin disc 4a; because the pressure in the arm pin oil cylinder 12 always exists, there is a downward pulling force on the arm pin 2a, so that the arm pin 2a has been inserted into the arm pin disc 4a but has not been completely released, and this process is called buffer release of the arm pin 2a;

[0076] When the arm pin 2a release position is received, the controller controls the first electromagnetic valve to lose power, the hydraulic pump 1 stops oil supply, the oil in the arm pin oil cylinder 12 is completely unloaded through the first electromagnetic valve and the back pressure mechanism 14, and the arm pin 2a reaches the completely released state. Embodiment

[0077] The embodiment provides a noise reduction method, which is different from the noise reduction method in embodiment two, and the difference lies in that:

[0078] Further comprising receiving the hydraulic system oil way temperature in real time;

[0079] According to the hydraulic system oil way temperature, the back pressure mechanism 14 is controlled to unload at different pressures; specifically:

[0080] When the hydraulic system oil way temperature is higher than the preset value, the controller controls the fourth electromagnetic reversing valve 14.3 to lose power, and the back pressure mechanism 14 provides a back pressure p4;

[0081] When the hydraulic system oil way temperature is lower than the preset value, the controller controls the fourth electromagnetic reversing valve 14.3 to gain power, and the back pressure mechanism 14 provides a back pressure p5;

[0082] And the controller controls the oil supply component to supply oil to the core pipe 7.1 in the telescopic oil cylinder 7 and the cylinder arm pin telescopic mechanism, controls the first pressure adjusting component and the second pressure adjusting component to be opened, and drives the arm pin oil cylinder 12 in the cylinder arm pin telescopic mechanism to stretch out to the right, drives the arm pin pulling mechanism in the cylinder arm pin mechanism to pull out the arm pin 2a, and controls the controller to receive the arm pin 2a movement position, release position and release displacement in real time; wherein the inner section arm 3a and the outer section arm 1a are unlocked after the arm pin 2a is pulled out, the telescopic oil cylinder 7 drives the inner section arm 3a to stretch out, and the arm pin 2a stretches out with the inner section arm 3a;

[0083] After the controller controls the first electromagnetic reversing valve 3 to lose power according to the arm pin 2a movement position to the preset position, the arm pin oil cylinder 12 is unloaded to the back pressure mechanism 14 through the core pipe 7.1 in the telescopic oil cylinder 7 and the first electromagnetic reversing valve 3, so that the arm pin oil cylinder 12 is retracted, the arm pin pulling mechanism in the cylinder arm pin mechanism is released in advance, the arm pin 2a is in low speed and slides on the inner side of the outer section arm 1a under the action of the spring mechanism and the cylinder arm pin mechanism 10, and slides with the telescopic oil cylinder 7;

[0084] When the arm pin 2a is released at low speed, the controller controls the first solenoid reversing valve 3 of the oil supply component and the second solenoid reversing valve 6 of the second pressure regulating component to be energized according to the release displacement of the arm pin 2a. This pressurizes the arm pin cylinder 12, causing the arm pin cylinder 12 to output thrust, which is used to offset part of the arm pin 2a's reset force. Under the combined action of the arm pin spring 9a and the cylinder arm pin mechanism 10, the arm pin 2a slides against the outer arm 1a with a slightly lower reset force, achieving the buffered release of the arm pin 2a.

[0085] When the arm pin 2a is released in a buffered manner, the controller controls the arm pin 2a to maintain the buffered release or controls the oil supply component to lose power, depending on the release position of the arm pin 2a.

[0086] like Figure 4 As shown, Figure 4 In the diagram, 'a' indicates that the cylinder pin mechanism 10 in the cylinder pin telescopic mechanism pulls out the arm pin 2a; 'b' indicates that the arm pin 2a is released in advance; 'c' indicates that the arm pin cylinder 12 is pressurized; 'd' indicates that the arm pin 2a is released with buffer; and 'e' indicates that the arm pin 2a is fully released. F1 indicates the pre-pressure of the arm pin spring 9a on the arm pin 2a after the arm pin 2a is fully released. F2 indicates the upward pressure of the arm pin spring 9a on the arm pin 2a during the second release. F3 indicates the upward pressure of the arm pin spring 9a and the cylinder pin mechanism 10 on the arm pin 2a after the arm pin 2a is released in advance, due to the pressurization of the arm pin cylinder 12. F4 indicates the upward force of the arm pin spring 9a on the arm pin 2a when the arm pin 2a is fully pulled out. F5 indicates the upward pressure of the arm pin spring 9a and the cylinder pin mechanism 10 on the arm pin 2a after the arm pin 2a is released in advance. Taking the position of the fully released arm pin 2a as the zero point and the positive displacement direction downward, the displacement and upward reset force curves of the arm pin 2a at different stages during the release process are plotted. Curve abe represents the release state of the arm pin 2a in the existing technology, and curve abcde represents the release state of the arm pin 2a in this solution. It can be seen that in the existing method of releasing the arm pin 2a prematurely and then fully, the arm pin 2a will strongly impact the arm pin seat 7a upon full release. In this solution, after the arm pin 2a is released prematurely, the arm pin cylinder 12 is pressurized, so that when the arm pin 2a is released with buffer, it first releases rapidly under the reset force provided by the arm pin spring 9a and the cylinder arm pin mechanism 10, inserting into the arm pin disc 4a. However, at this time, the arm pin 2a does not impact the arm pin seat 7a. Then, the arm pin cylinder 12 unloads with a certain back pressure, and the arm pin 2a contacts the arm pin disc 4a, slowly releasing completely. In this scheme, the release process of arm pin 2a can reduce the release noise of arm pin 2a and reduce the risk of structural damage to arm pin 2a.

[0087] In summary, the arm pin 2a is released in advance, the arm pin oil cylinder 12 is pressurized, the arm pin 2a is released slowly, the arm pin 2a is first released quickly under the reset force provided by the arm pin spring 9a and the cylinder arm pin mechanism, and then the arm pin 2a is inserted into the arm pin disc 4a, but at this time, the arm pin 2a does not collide with the arm pin seat 7a, then the arm pin oil cylinder 12 is unloaded with a certain back pressure, the arm pin 2a contacts the arm pin disc 4a, and the arm pin 2a is slowly and completely released. The release process of the arm pin 2a in the scheme can reduce the release noise of the arm pin 2a, reduce the risk of damage to the structure of the arm pin 2a, and through the release unloading back pressure setting mode of the arm pin 2a, a plurality of unloading back pressures can be provided for the early release and complete release of the arm pin 2a, the influence of different environmental temperatures on the release speed of the arm pin 2a is adapted, and the impact noise of the outer joint arm 1a caused by the early release of the arm pin 2a is reduced.

[0088] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" and the like can be explicitly or implicitly included one or more. In the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0089] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

Claims

1. A single-cylinder pin-type crane boom pin release noise reduction system, characterized in that, include: The cylinder arm pin telescopic mechanism, oil supply component, telescopic cylinder, first pressure regulating component, second pressure regulating component, back pressure mechanism, controller and measuring element; The cylinder arm pin telescopic mechanism includes a cylinder pin cylinder and an arm pin cylinder; the cylinder pin cylinder and the arm pin cylinder are respectively connected to the telescopic cylinder and are used to provide power to the cylinder arm pin mechanism and control the pulling out and releasing of the cylinder pin and the arm pin. The telescopic cylinder is connected to the oil supply component and is connected to the cylinder arm pin telescopic mechanism through the core tube inside the telescopic cylinder, which is used to provide hydraulic power to the cylinder arm pin telescopic mechanism. The oil supply component includes: a hydraulic pump and a first electromagnetic reversing valve; the first electromagnetic reversing valve is located at the oil outlet of the hydraulic pump; it is used to control the hydraulic pump to supply hydraulic oil to the core tube and cylinder arm pin telescopic mechanism inside the telescopic cylinder, and the first electromagnetic reversing valve is also located between the cylinder arm pin telescopic mechanism and the back pressure mechanism. The first pressure regulating component is located in the oil supply component and is used to limit the oil supply pressure of the hydraulic system; the second pressure regulating component is located between the oil supply component and the telescopic cylinder and is used to limit the pressure of the core tube and cylinder arm pin telescopic mechanism inside the telescopic cylinder. The back pressure mechanism is located between the first electromagnetic directional valve and the hydraulic oil tank, and is used to limit the unloading pressure of the hydraulic system. The measuring element includes a temperature sensor installed on the hydraulic oil circuit, a length measuring sensor installed on the arm pin, and a position detection switch. The measuring element is used to feed back the hydraulic system oil temperature, arm pin movement position, release position, and displacement to the controller. The controller, based on feedback data from the measuring elements, controls the oil supply component, the first pressure regulating component, the second pressure regulating component, and the back pressure mechanism to be energized or de-energized respectively. This is used to control the arm pin mechanism to pull out the arm pin, to release the arm pin in advance after it is pulled out, and to pressurize the arm pin cylinder after release. This allows the arm pin to be released from a low speed, to be released with a buffer, and finally to be released completely. At the same time, the back pressure mechanism unloads the arm pin cylinder, reducing the noise of the arm pin release and offsetting the impact force of the arm pin release.

2. The single-cylinder pin-type crane boom pin release noise reduction system according to claim 1, characterized in that, The back pressure mechanism includes: a first check valve, a second check valve, and a fourth solenoid directional valve; The oil inlet of the first check valve is connected to the oil outlet of the first solenoid directional valve, and the oil outlet of the first check valve is connected to the hydraulic oil tank; the oil inlet of the second check valve is connected to the oil outlet of the first solenoid directional valve through the fourth solenoid directional valve, and the oil outlet of the second check valve is connected to the hydraulic oil tank; the pressure thresholds for opening the first check valve and the second check valve are p4 and p5, respectively.

3. The single-cylinder pin-type crane boom pin release noise reduction system according to claim 2, characterized in that, The first pressure regulating component is a first relief valve, and the pressure threshold of the first relief valve is p1.

4. The single-cylinder pin-type crane boom pin release noise reduction system according to claim 3, characterized in that, The second pressure regulating component includes: a second relief valve, a third relief valve, and a second solenoid directional valve; The second relief valve is located between the hydraulic oil tank and the telescopic cylinder, and the third relief valve is located between the hydraulic oil tank and the telescopic cylinder via a second solenoid directional valve; the pressure thresholds of the second relief valve and the third relief valve are p2 and p3, respectively.

5. The single-cylinder pin-type crane boom pin release noise reduction system according to claim 4, characterized in that, The pressure relationship among the first relief valve, the second relief valve, the third relief valve, the first check valve, and the second check valve is p1 > p2 > p3 > p4 > p5.

6. The single-cylinder pin-type crane boom pin release noise reduction system according to claim 1, characterized in that, The core tube is connected to the cylinder pin cylinder and the arm pin cylinder respectively through a cylinder arm pin switching valve, which is a third solenoid directional valve.

7. The single-cylinder pin-type crane boom pin release noise reduction system according to claim 1, characterized in that, The cylinder arm pin mechanism includes a cylinder pin, a pull arm pin mechanism, and a spring mechanism, wherein the spring mechanism is used to provide a restoring force for the cylinder pin and the arm pin.

8. A method for noise reduction in the release of boom pins of a single-cylinder pin-type crane, characterized in that, Based on the noise reduction system of claim 1, the noise reduction method includes: The controller controls the oil supply component to supply oil to the core tube and cylinder arm pin telescopic mechanism inside the telescopic cylinder, and at the same time controls the opening of the first pressure regulating component and the second pressure regulating component to drive the arm pin cylinder in the cylinder arm pin telescopic mechanism to extend to the right and drive the arm pin pulling mechanism in the cylinder arm pin mechanism to pull out the arm pin; and the controller receives the arm pin movement position, release position and release displacement in real time; wherein, after the arm pin is pulled out, the inner arm and the outer arm are unlocked, the telescopic cylinder drives the inner arm to extend, and the arm pin moves with the extension of the inner arm; After the controller moves the arm pin to the preset position, it controls the first solenoid reversing valve to de-energize. The arm pin cylinder unloads the back pressure mechanism through the core tube inside the telescopic cylinder and the first solenoid reversing valve, causing the arm pin cylinder to retract. This causes the arm pin release mechanism in the cylinder arm pin mechanism to release the arm pin in advance and at low speed. Under the action of the spring mechanism and the cylinder arm pin mechanism, the arm pin slides against the inner side of the outer arm section at low speed and slides with the telescopic cylinder. When the arm pin is released at low speed, the controller controls the first solenoid directional valve of the oil supply component and the second solenoid directional valve of the second pressure regulating component to be energized according to the arm pin release displacement. This pressurizes the arm pin cylinder, causing the arm pin cylinder to output thrust to the arm pin, which is used to offset part of the arm pin reset force. Under the action of the cylinder arm pin mechanism, the arm pin slides against the outer arm section with a slightly lower reset force, achieving the buffered release of the arm pin. When the arm pin is released, the controller controls the arm pin to maintain the buffer release or controls the oil supply component to lose power, depending on the release position of the arm pin.

9. The method for noise reduction of single-cylinder pin-type crane boom pin release according to claim 8, characterized in that, When the boom pin is released with buffer, the controller, based on the boom pin's release position, controls the boom pin to maintain buffer release or de-energizes the oil supply components, including: When the arm pin is released to the outer arm pin disc, the pressure in the arm pin cylinder is maintained at p3, and the arm pin continues to release with a buffer. When the arm pin is released to the fully released position, the first solenoid valve is de-energized, the hydraulic pump stops supplying oil, and the oil in the arm pin cylinder is completely unloaded through the first solenoid valve and the back pressure mechanism, so that the arm pin reaches the fully released state.

10. The method for noise reduction of single-cylinder pin-type crane boom pin release according to claim 8, characterized in that, The noise reduction method also includes real-time reception of the hydraulic system oil circuit temperature; Based on the hydraulic system oil circuit temperature, the back pressure mechanism is controlled to unload at different pressures, including: When the hydraulic system oil temperature is higher than the preset value, the controller de-energizes the fourth solenoid directional valve, and the back pressure mechanism provides back pressure p4. When the hydraulic system oil temperature is lower than the preset value, the controller controls the fourth solenoid directional valve to be energized, and the back pressure mechanism provides a back pressure of p5.

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