An arm pin insertion and extraction mechanism for a boom and its hydraulic control system

Abstract

The present invention discloses an arm pin plug-in / pull-out mechanism for a boom, which includes a main seat and an arm pin plug-in / pull-out assembly, a cylinder pin assembly, and a self-locking mechanism installed on the main seat. The main seat is provided with a first mounting hole, a second mounting hole, and a third mounting hole at intervals. The arm pin plug-in / pull-out assembly includes an arm pin oil cylinder, an arm pin cylinder rod body, and an arm pin. The cylinder pin assembly is inserted into the second mounting hole, and the self-locking mechanism is arranged in the third mounting hole. When the cylinder pin assembly moves, the other end of the self-locking mechanism can be pushed by the cylinder pin assembly to extend into the first mounting hole to stop the movement of the arm pin cylinder rod body. The present invention also provides a hydraulic control system. The direct arm pin plug-in / pull-out mechanism and its hydraulic control system disclosed by the present invention do not need to be controlled by another mechanism when the arm pin plug-in / pull-out assembly is plugged in and out. The self-locking mechanism is driven to move by the movement of the cylinder pin assembly, thereby moving upward and directly blocking the arm pin cylinder rod body, thereby preventing the arm pin cylinder rod body from retracting, thereby realizing the interlocking function.

Description

Technical Field

[0001] The present invention relates to the technical field of crane booms, and in particular to an arm pin inserting and extracting mechanism of a boom and a hydraulic control system thereof. Background Art

[0002] Truck cranes play a vital role in daily operations, and the boom is its most critical working component. Its design directly impacts its lifting performance. The boom pin, located at the end of each telescopic boom section, locks that section to the adjacent, outboard section, allowing for radial movement along the boom. The pin locks and unlocks a telescopic boom section from its adjacent, outboard section.

[0003] In the related art, there are two main types of arm pins, top pins and side pins. The side pins are wall pins placed on both sides of the arm. When the side pins are in working condition, the arm pin pulling or interlocking are performed by a connecting rod mechanism, that is, the function of plugging and pulling pins is completed indirectly, and it cannot act directly on the plugging and pulling pins, and its reliability is poor. Summary of the Invention

[0004] In order to solve the above technical problems, an embodiment of the present invention is intended to provide an arm pin insertion and extraction mechanism of a boom that directly controls the insertion and extraction of arm pins and is self-locking to each other, and a hydraulic control system thereof.

[0005] The technical solution of the present invention is achieved as follows:

[0006] The arm pin plugging and pulling mechanism of a boom comprises a main seat and an arm pin plugging and pulling assembly, a cylinder pin assembly and a self-locking mechanism installed on the main seat. The main seat is provided with a first mounting hole, a second mounting hole and a third mounting hole connecting the first mounting hole and the second mounting hole at intervals. The arm pin plugging and pulling assembly comprises an arm pin oil cylinder, an arm pin cylinder rod body, and an arm pin connected to the arm pin cylinder rod body. The arm pin cylinder rod body is inserted into the first mounting hole and moves under the drive of the arm pin oil cylinder to drive the arm pin to move. The cylinder pin assembly is inserted into the second mounting hole. The self-locking mechanism is arranged in the third mounting hole. One end of the self-locking mechanism extends into the second mounting hole and abuts against the cylinder pin. When the cylinder pin assembly moves, the other end of the self-locking mechanism can be pushed by the cylinder pin assembly to extend into the first mounting hole to stop the movement of the arm pin cylinder rod body.

[0007] Preferably, a guide slope is provided on the outer periphery of the cylinder pin, and the self-locking mechanism contacts the guide slope. When the cylinder pin moves, the self-locking mechanism pushes the self-locking mechanism to slide upward along the guide slope.

[0008] Preferably, the guide slope is a chamfer provided at the end of the cylinder pin.

[0009] Preferably, the arm pin cylinder rod body is connected to the arm pin via an arm pin connecting block;

[0010] An installation slot is provided in the arm pin connection block, and one end of the arm pin cylinder rod body is assembled in the installation slot and connected to the arm pin connection block.

[0011] Preferably, the arm pin plug-in assembly and the cylinder pin assembly are both symmetrically arranged in two pieces.

[0012] Preferably, a guide sleeve and a spring sleeved outside the guide sleeve are provided in the first mounting hole, a guide hole is opened at the end of the arm pin cylinder rod body, and the guide sleeve and the spring are at least partially embedded in the guide hole.

[0013] Preferably, the cylinder pin assembly includes a cylinder pin cylinder, a cylinder pin, a pressure cover, a cylinder pin guide sleeve and a reset spring. The cylinder pin is inserted into the second mounting hole, the pressure cover is assembled outside the cylinder pin, the cylinder pin cylinder is used to drive the cylinder pin to move, the cylinder pin is provided with a reset groove, and the cylinder pin guide sleeve and the reset spring are at least partially embedded in the reset groove.

[0014] Preferably, the self-locking mechanism is a pin.

[0015] A hydraulic control system comprises an oil supply circuit and a cylinder pin assembly drive circuit and an arm pin assembly drive circuit connected to the oil supply circuit, wherein the cylinder pin assembly drive circuit and the arm pin assembly drive circuit are connected in parallel.

[0016] Preferably, the oil supply circuit includes an oil pump, a first one-way valve, a first solenoid valve, a solenoid valve group, an electric proportional reversing valve, a balancing valve and a telescopic oil cylinder connected through an oil circuit;

[0017] The cylinder pin assembly drive circuit includes a second solenoid valve, a third solenoid valve, a second one-way valve, and a first diverter valve connected to the telescopic cylinder through an oil circuit, wherein the first diverter valve is connected to the cylinder pin assembly;

[0018] The arm pin assembly drive circuit includes a fourth solenoid valve, a fifth solenoid valve, a third one-way valve, and a second diverter valve connected to the telescopic cylinder through an oil circuit. The second diverter valve is connected to the arm pin plug-in assembly.

[0019] The arm pin plugging and pulling mechanism of the boom provided in an embodiment of the present invention is connected to the arm pin through an arm pin cylinder rod body, so that the arm pin cylinder rod body can directly control the extension and retraction of the arm pin under the drive of the arm pin oil cylinder. When the arm pin plugging and pulling assembly is plugged in and out, there is no need to control it through another mechanism. The movement of the cylinder pin assembly drives the self-locking mechanism to move, thereby running upward and directly blocking the arm pin cylinder rod body, preventing the arm pin cylinder rod body from retracting, thereby realizing the interlocking function. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic structural diagram of the arm pin insertion and extraction mechanism of the boom provided by the present invention;

[0021] Figure 2 for Figure 1 The cross-sectional view along AA is shown;

[0022] Figure 3 This is a structural schematic diagram of the hydraulic control system provided by the present invention. DETAILED DESCRIPTION

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0024] See also Figure 1 and Figure 2 The arm pin insertion and extraction mechanism of the boom includes a main seat 1 and an arm pin insertion and extraction assembly 2, a cylinder pin assembly 3 and a self-locking mechanism 4 installed on the main seat 1.

[0025] The main seat 1 is provided with a first mounting hole 11, a second mounting hole 13, and a third mounting hole 15 connecting the first mounting hole 11 and the second mounting hole 13 at intervals. The first mounting hole 11 and the second mounting hole 13 are horizontally provided on the main seat 1, and the third mounting hole 15 vertically connects the first mounting hole 11 and the second mounting hole 13. The arm pin insertion assembly 2 is provided in the first mounting hole 11, and the cylinder pin assembly 3 is provided in the second mounting hole 13.

[0026] The arm pin plugging and pulling assembly 2 includes an arm pin cylinder 21, an arm pin cylinder rod body 22, and an arm pin 23 connected to the arm pin cylinder rod body 22. The arm pin cylinder rod body 22 is inserted into the first mounting hole 11 and moves under the drive of the arm pin cylinder 21, thereby driving the arm pin 23 to move, thereby realizing direct plugging and pulling out of the arm pin 23.

[0027] It is worth mentioning that the arm pin insertion and extraction assembly 2 also includes an arm pin detection unit provided on the main seat 1. The arm pin detection unit is used to detect whether the arm pin cylinder rod body 22 is extended and retracted. The arm pin detection unit includes an arm pin sensor 24 and an arm pin detector 25. The arm pin sensor 24 is used to detect whether the arm pin cylinder rod body 22 moves when the arm pin 23 is extended and retracted. The arm pin detector 25 is used to detect whether the arm pin cylinder rod body has moved to a preset position. The provision of the arm pin detection unit can effectively improve the working accuracy of the arm pin 23 extension and retraction, and is safe and reliable.

[0028] Specifically, the arm pin sensor 24 is an infrared sensor; the arm pin detector 25 is a position sensor.

[0029] It should be noted that the arm pin cylinder rod body 22 is connected to the arm pin 23 through the arm pin connecting block 26. The movement of the arm pin cylinder rod body 22 drives the arm pin 23 to extend and retract. The arm pin 23 is connected to the first section arm 5 and the second section arm 6.

[0030] The arm pin connection block 26 defines a mounting slot 261, and one end of the arm pin cylinder rod 22 is assembled in the mounting slot 261 and connected to the arm pin connection block 26. The mounting slot 261 is U-shaped, and the arm pin cylinder rod 22 extends from the opening of the U-shaped mounting slot 261 and is inserted into the first mounting hole 11.

[0031] A guide sleeve 27 and a spring 28 mounted on the outside of the guide sleeve 27 are further disposed within the first mounting hole 11. A guide hole 221 is defined at the end of the arm pin cylinder rod 22. The guide sleeve 27 and the spring 28 are at least partially embedded within the guide hole 221. The two ends of the spring 28 abut against the bottom of the first mounting hole 11 and the arm pin cylinder rod 22, respectively, to reset the arm pin cylinder rod 22.

[0032] The cylinder pin assembly 3 includes a cylinder pin cylinder 31, a cylinder pin 33, a pressure cover 35, a cylinder pin guide sleeve 36 and a reset spring 37. The cylinder pin 33 is inserted into the second mounting hole 13, and the pressure cover 35 is assembled outside the cylinder pin 33. The cylinder pin cylinder 31 is used to drive the cylinder pin 33 to perform telescopic movement. The cylinder pin 33 is provided with a reset groove 331. The cylinder pin guide sleeve 36 and the reset spring 37 are at least partially embedded in the reset groove 331.

[0033] It should be noted that, in order to prevent the cylinder pin 33 from rotating, a cylinder pin anti-rotation pin 39 is further provided below the cylinder pin 33 .

[0034] The self-locking mechanism 4 is arranged in the third mounting hole 15, and one end of the self-locking mechanism 4 extends into the second mounting hole 13 and abuts against the cylinder pin 33. When the cylinder pin assembly 3 moves, the other end of the self-locking mechanism 4 can be pushed by the cylinder pin assembly 3 to extend into the first mounting hole 11 to stop the movement of the arm pin cylinder rod body 22.

[0035] A guide slope 30 is provided on the outer periphery of the cylinder pin 33, and the self-locking mechanism 4 contacts the guide slope 30. When the cylinder pin 33 moves under the drive of the cylinder pin oil cylinder 31, the self-locking mechanism 4 pushes the self-locking mechanism 4 to slide upward along the guide slope and ejects the self-locking mechanism 4 into the first mounting hole 11, thereby stopping the movement of the arm pin cylinder rod body 22 installed in the first mounting hole 11, so that the arm pin cylinder rod body 22 cannot retract, thereby realizing the interlocking function.

[0036] Of course, if the cylinder pin 33 does not perform telescopic movement, that is, the cylinder pin 33 does not move, the arm pin cylinder rod body 22 can move freely without interference.

[0037] Specifically, in this embodiment, the guide slope 30 is a chamfered corner formed at the end of the cylinder pin 33. The outer circumference of the chamfer is an inclined surface, and the slow lifting function of the self-locking mechanism 4 is achieved by changing the height of the inclined surface. The cylinder pin assembly also includes a cylinder pin sensor 41 and a cylinder pin position detector 42 for identifying the movement and position of the cylinder pin. Specifically, the cylinder pin sensor 41 is an infrared sensor; the cylinder pin position detector 42 is a position sensor.

[0038] Specifically, in this embodiment, the self-locking mechanism 4 is a pin that can move up and down along the third mounting hole 15. Of course, in other embodiments, the self-locking mechanism 4 can also function as long as it is a rod-shaped structure. It should be noted that a spring can be provided inside the pin to reset the pin.

[0039] Preferably, the arm pin plug-in assembly 2 and the cylinder pin assembly 3 are both symmetrically arranged in pairs to increase the reliability and stability of the structure.

[0040] It should be noted that both the cylinder pin oil cylinder 31 and the arm pin oil cylinder 21 are single-acting cylinders, which can reduce pipeline layout and save space while achieving their functions.

[0041] See also Figure 3The present invention also provides a hydraulic control system for the arm pin insertion and extraction mechanism of a boom. The hydraulic control system includes an oil supply circuit 7 and a cylinder pin assembly drive circuit 8 and an arm pin assembly drive circuit 9 connected to the oil supply circuit 7. The cylinder pin assembly drive circuit 8 and the arm pin assembly drive circuit 9 are connected in parallel. The oil supply circuit 7 provides drive to the cylinder pin assembly drive circuit 8 and the arm pin assembly drive circuit 9 simultaneously, thereby achieving simultaneous direct action of the two without the need for control through any other intermediate mechanism.

[0042] The oil supply circuit 7 includes an oil pump 71 connected to the oil tank through an oil circuit, a first one-way valve 72 , a first solenoid valve 73 , a solenoid valve group 74 , an electric proportional reversing valve 75 , a balancing valve 76 and a telescopic oil cylinder 77 .

[0043] The cylinder pin assembly drive circuit 8 includes a second solenoid valve 81, a third solenoid valve 82, a second one-way valve 83, and a first diverter valve 84, which are connected to the telescopic cylinder 77 via an oil circuit. The first diverter valve 84 is connected to the cylinder pin cylinder 31 of the cylinder pin assembly 3. Before the hydraulic oil enters the cylinder pin cylinder 31, it is diverted by the first diverter valve 84, which can maintain the synchronization of the extension and contraction of the two cylinders as much as possible.

[0044] The arm pin assembly drive circuit 9 includes a fourth solenoid valve 91, a fifth solenoid valve 92, a third one-way valve 93, and a second diverter valve 94, which are connected to the telescopic cylinder 77 via an oil circuit. The second diverter valve is connected to the arm pin cylinder 21 of the arm pin insertion and extraction assembly 2. Before the hydraulic oil enters the arm pin cylinder 21, it is diverted by the second diverter valve to maintain the synchronization of the extension and retraction of the two cylinders as much as possible.

[0045] The hydraulic principle of the hydraulic system is as follows:

[0046] When the hydraulic system is started: Y1 of the first solenoid valve 73 is energized, the other valves remain in their original states, and the hydraulic system is unloaded;

[0047] When the cylinder pin 33 is retracted, the solenoid valve Y4 in the solenoid valve group 74 and the solenoid valve Y6 in the second solenoid valve 81 are energized, and the other valves maintain their original states.

[0048] When the arm pin 23 is retracted, the solenoid valve Y4 in the solenoid valve group 74 and the solenoid valve Y8 in the fourth solenoid valve 91 are energized, and the other valves remain in their original states.

[0049] When the cylinder pin 33 extends, Y5 of the third solenoid valve 82 and Y6 of the second solenoid valve 81 are energized, and the other valves remain in their original state.

[0050] When the arm pin 23 is extended: Y7 of the fifth solenoid valve 92 and Y8 of the fifth solenoid valve 92 are energized, and the other valves remain in their original states;

[0051] When the boom is extended: after the arm pin 23 is retracted, Y2 of the electric proportional reversing valve 75 is energized, and the other valves remain in their original state.

[0052] When the valve is extended without load, the arm pin 23 and the cylinder pin 33 are retracted, and Y2 of the electric proportional reversing valve 75 is energized, and the other valves remain in their original state.

[0053] When the boom is retracted: after the arm pin 23 is retracted, Y3 of the electric proportional reversing valve 75 is energized, and the other valves remain in their original states;

[0054] During unloaded retraction, after the arm pin 23 and cylinder pin 33 are retracted, Y3 of the electric proportional reversing valve 75 is energized, while the other valves remain in their original states. The hydraulic control system maintains this state after the arm pin 23 and cylinder pin 33 complete their movements, directly unloading the hydraulic oil flowing through the center channel of the telescopic cylinder 77, thus preventing the center channel from maintaining a constant high pressure.

[0055] The arm pin plugging and pulling mechanism of the boom provided in an embodiment of the present invention and its hydraulic control system are connected to the arm pin through an arm pin cylinder rod body, so that the arm pin cylinder rod body can directly control the extension and retraction of the arm pin under the drive of the arm pin oil cylinder. When the arm pin plugging and pulling assembly is plugged in and out, there is no need to control it through another mechanism. The movement of the cylinder pin assembly drives the self-locking mechanism to move, thereby running upward and directly blocking the arm pin cylinder rod body, preventing the arm pin cylinder rod body from retracting, thereby realizing the interlocking function.

[0056] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An arm pin insertion and extraction mechanism for a boom, characterized in that: It includes a main seat and an arm pin plug-in assembly, a cylinder pin assembly and a self-locking mechanism installed on the main seat. The main seat is spaced apart with a first mounting hole, a second mounting hole and a third mounting hole connecting the first mounting hole and the second mounting hole. The arm pin plug-in assembly includes an arm pin cylinder, an arm pin cylinder rod body, and an arm pin connected to the arm pin cylinder rod body. The arm pin cylinder rod body is inserted into the first mounting hole and moves under the drive of the arm pin cylinder to drive the arm pin to move. The cylinder pin assembly is inserted into the second mounting hole. The self-locking mechanism is arranged in the third mounting hole. One end of the self-locking mechanism extends into the second mounting hole and abuts against the cylinder pin in the cylinder pin assembly. When the cylinder pin assembly moves, the other end of the self-locking mechanism can be pushed by the cylinder pin assembly to extend into the first mounting hole to stop the movement of the arm pin cylinder rod body.

2. The arm pin insertion and extraction mechanism of the boom according to claim 1, characterized in that: A guide slope is provided on the outer periphery of the cylinder pin, and the self-locking mechanism contacts the guide slope. When the cylinder pin moves, the self-locking mechanism pushes the self-locking mechanism to slide upward along the guide slope.

3. The arm pin insertion and extraction mechanism of the boom according to claim 2, characterized in that: The guide slope is a chamfer opened on the end of the cylinder pin.

4. The arm pin insertion and extraction mechanism of the boom according to claim 1, characterized in that: The arm pin cylinder rod body is connected to the arm pin through an arm pin connecting block; An installation slot is provided in the arm pin connection block, and one end of the arm pin cylinder rod body is assembled in the installation slot and connected to the arm pin connection block.

5. The arm pin insertion and extraction mechanism of the boom according to claim 1, characterized in that: The arm pin plug-in assembly and the cylinder pin assembly are both symmetrically arranged.

6. The arm pin insertion and extraction mechanism of the boom according to claim 1, characterized in that: A guide sleeve and a spring sleeved outside the guide sleeve are provided in the first mounting hole, a guide hole is opened at the end of the arm pin cylinder rod body, and the guide sleeve and the spring are at least partially embedded in the guide hole.

7. The arm pin insertion and extraction mechanism of the boom according to claim 1, characterized in that: The cylinder pin assembly includes a cylinder pin cylinder, a cylinder pin, a pressure cover, a cylinder pin guide sleeve and a reset spring. The cylinder pin is inserted into the second mounting hole, and the pressure cover is assembled outside the cylinder pin. The cylinder pin cylinder is used to drive the cylinder pin to move. The cylinder pin is provided with a reset groove, and the cylinder pin guide sleeve and the reset spring are at least partially embedded in the reset groove.

8. The arm pin insertion and extraction mechanism of the boom according to claim 1, characterized in that: The self-locking mechanism is a pin.

9. A hydraulic control system using the arm pin insertion and extraction mechanism of a boom according to any one of claims 1 to 8, characterized in that: It comprises an oil supply circuit and a cylinder pin assembly drive circuit and an arm pin assembly drive circuit connected to the oil supply circuit. The cylinder pin assembly drive circuit is connected in parallel with the arm pin assembly drive circuit.

10. The hydraulic control system of the arm pin insertion and extraction mechanism of the boom according to claim 9, characterized in that: The oil supply circuit includes an oil pump, a first one-way valve, a first solenoid valve, a solenoid valve group, an electric proportional reversing valve, a balancing valve and a telescopic oil cylinder connected through an oil circuit; The cylinder pin assembly drive circuit includes a second solenoid valve, a third solenoid valve, a second one-way valve, and a first diverter valve connected to the telescopic cylinder through an oil circuit, wherein the first diverter valve is connected to the cylinder pin assembly; The arm pin assembly drive circuit includes a fourth solenoid valve, a fifth solenoid valve, a third one-way valve, and a second diverter valve connected to the telescopic cylinder through an oil circuit. The second diverter valve is connected to the arm pin plug-in assembly.

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