Hydraulic control system for hooklift
By combining components such as hydraulic plunger pumps and pneumatic multi-way valves, the system achieves adjustable hook height, rapid lowering, and emergency slow lowering, solving the problems of low loading efficiency, insufficient emergency protection, and limited application range of existing detachable garbage trucks, and improving the system's safety and flexibility.
Patent Information
- Application Number
- CN202422499282.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-16
- Publication Date
- 2025-10-17
- Estimated Expiration
- 2034-10-16
AI Technical Summary
Existing detachable garbage trucks are inefficient during loading and unloading, lack emergency protection functions, have non-adjustable hook height, limit their application range, and their hydraulic systems are prone to failure of the balance valve due to pipeline rupture.
It employs a hydraulic piston pump, a pneumatic multi-way valve, a boom hook control module, a rear support control module, and a boom mechanism control module, combined with components such as a two-way hydraulic lock, a one-way throttle valve, and a solenoid valve, to achieve adjustable boom hook height, rapid lowering, emergency slow lowering, and independent control of the support cylinder, thus ensuring smooth lowering in case of hydraulic system failure.
It improves the loading and unloading efficiency, enhances the emergency protection function, expands the application range of the garbage bin, avoids the failure of the balancing valve due to pipeline rupture, and ensures the safety and reliability of the system.
Smart Images
Figure CN223447344U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the hydraulic field, especially relates to a hydraulic system of detachable garbage truck of carriage. BACKGROUND
[0002] The detachable garbage truck of carriage is mainly used for fixed garbage compression transfer station and mobile compression equipment station, and is used for transferring the garbage collection box or mobile garbage box in the station. The detachable garbage truck of carriage is generally provided with a lifting mechanism on the chassis, and the main functions of the detachable garbage truck of carriage are realized by hydraulic power. The main functions include lifting the garbage box by the lifting arm and falling the garbage box on the bottom frame, sliding the garbage box on the bottom frame until the whole garbage box is completely fallen on the bottom frame, fixing the garbage box on the bottom frame by the rear locking mechanism after the garbage box is slid into position, preventing the garbage box from moving during transportation, opening and closing the rear door of the garbage box by the self power when the garbage box is unloaded, and the rear of the detachable garbage truck of carriage is generally provided with supporting legs to balance the weight of the garbage box and avoid accidents caused by the upward tilting of the truck head. Among these functions, the most important function of the arm truck is the performance of the arm hook, because it is closely related to the work efficiency, and the supporting function is related to the operation safety. The detachable garbage truck of carriage is efficient and reliable in operation, and is widely used in the transportation of garbage boxes and other box-shaped equipment.
[0003] The conventional detachable garbage truck of carriage has the following defects:
[0004] 1. When loading the garbage box, the arm hook of the detachable garbage truck of carriage should be first placed out and lowered to the same height as the hook ring in front of the garbage box, then the arm hook is hooked to the hook ring in front of the garbage box, and then the garbage box is slowly lifted. When unloading, the garbage box also needs to be slowly lifted, that is, when loading and placing the hook, there is no load, and the garbage box can be quickly lowered, while when unloading, the garbage box needs to be slowly lifted. For the detachable garbage truck of carriage, the loading efficiency can be improved, and the existing detachable garbage truck of carriage cannot meet the requirements of such operation.
[0005] 2. The existing detachable garbage truck of carriage does not have the function of slow lowering in emergency, and does not have the emergency protection function. Generally, the garbage box is filled with compressed garbage, and the compacted density is relatively high, so the weight of the whole box is large. If the hydraulic system fails during loading, unloading or placing the box and cannot timely and smoothly lower the garbage box to the lifting state, an accident may occur. Therefore, when the hydraulic system works, the garbage box can still be automatically and smoothly lowered in case of failure.
[0006] 3. Because the trash bins loaded on detachable-carriage garbage trucks are relatively heavy, the hook arm must be able to move smoothly when lifting or lowering the bin without thrusting, and must remain securely in any position to meet practical usage requirements. Existing detachable-carriage garbage trucks are equipped with a two-way balancing valve to achieve this functional requirement. However, most use a plate-type balancing valve, which is connected to the pipeline. If the intermediate pipeline ruptures, the balancing valve will lose its function, causing immeasurable losses.
[0007] 4. The height of the arm hook of the existing detachable garbage truck is generally not adjustable, and it can only be connected to some garbage bins of specific standards, which limits the scope of application.
[0008] This system mainly aims at the above shortcomings and deficiencies of existing boom trucks and proposes some improvement plans. Utility Model Content
[0009] The purpose of the utility model is to provide a hydraulic control system for a boom truck, which can adjust the height of the boom hook and match more garbage bins, thereby solving the above shortcomings and deficiencies in the background technology.
[0010] The purpose of the utility model is achieved as follows: a hydraulic control system for a boom truck, including a hydraulic oil tank, a hydraulic plunger pump, a pneumatic multi-way valve, and also includes a boom hook control module, a rear support control module and a boom mechanism control module.
[0011] As a further improvement of the present invention, the hydraulic plunger pump is mounted on the chassis power take-off and connected to a pneumatic multi-way valve. The hydraulic plunger pump provides power to the various operating mechanisms on the upper arm, completing the basic actions of the hooklift, such as hooking, unloading, unloading, and supporting.
[0012] As a further improvement to the present invention, the hooklift control module includes a two-way hydraulic lock, a one-way throttle valve, and a swing cylinder. One outlet of the two-way hydraulic lock is connected to the rodless chamber of the swing cylinder, while the other outlet is connected to the inlet of the one-way throttle valve. The outlet of the one-way throttle valve is connected to the rod chamber of the swing cylinder. Both inlets of the two-way hydraulic lock are connected to the pneumatically controlled multi-way valve. These inlets are connected to ports A1 and B1 of the pneumatically controlled multi-way valve, respectively.
[0013] As a further improvement of the utility model, the rear support control module comprises four two-position electromagnetic valves, a support oil cylinder, a proximity switch, a check valve, a damping hole, an overflow valve, a hydraulic oil tank and a connecting pipeline, the check valve outlet is connected with the first two-position electromagnetic valve and the fourth two-position electromagnetic valve through a tee joint respectively, the first two-position electromagnetic valve outlet is connected with the second two-position electromagnetic valve and the rodless cavity of the support oil cylinder through a tee joint respectively, the fourth two-position electromagnetic valve outlet is connected with the third two-position electromagnetic valve and the rod cavity of the support oil cylinder through a tee joint respectively, the second two-position electromagnetic valve outlet returns to the hydraulic oil tank through the damping hole, the third two-position electromagnetic valve outlet is connected with the hydraulic oil tank, the rodless cavity of the support oil cylinder is integrated with the proximity switch, the check valve inlet is connected with the air control multi-way valve, a pipeline for installing the overflow valve is further arranged between the pipeline between the second two-position electromagnetic valve and the hydraulic oil tank and the pipeline between the check valve and the air control multi-way valve, and the outlet of the overflow valve is close to the hydraulic oil tank. The check valve inlet is connected with the A2 oil port of the air control multi-way valve.
[0014] As a further improvement of the utility model, the pull arm mechanism control module comprises a swing arm oil cylinder and a multifunctional valve block integrated on the swing arm oil cylinder, the A port channel of the multifunctional valve block is connected with the inlet of the external control type one-way balance valve, the outlet of the balance valve is connected with the rodless cavity of the swing arm oil cylinder through one side of a tee joint, and the other side is connected with the inlet of the one-way valve; the outlet of the one-way valve is connected with the outlet of the external control type two-way balance valve, the inlet control oil channel of the external control type one-way balance valve is connected with a one-way throttle valve, the outlet of the one-way throttle valve is connected with the control cavity of the external control type two-way balance valve, the B port channel of the multifunctional valve block is connected with the inlet of the two-way valve, the outlet of the two-way valve is connected with the rod cavity of the swing arm oil cylinder through one side of a tee joint, and the other side is connected with the inlet of the external control type balance valve two, and the control oil channel of the inlet of the two-way valve is connected with the pilot cavity of the external control type balance valve one and the spring cavity of the external control type balance valve two respectively. The multifunctional valve block can be provided with different plug-in components according to requirements to realize different functions, the multifunctional valve block of the technical scheme is a quick lowering control function module, and the swing arm oil cylinder is provided with at least two.
[0015] As a further improvement of the utility model, the control oil channel of the external control type balance valve one is connected with the three-way valve and the two-position electromagnetic control valve one. The multifunctional valve block of the technical scheme is a quick lowering switching control function module, which is used for switching off the differential lowering function at any time during the quick lowering of the pull arm, and is integrated on the basis of the quick lowering control function module.
[0016] As a further improvement of the utility model, the A port channel of the multifunctional valve block is connected with the two-position electromagnetic control valve two before the node of the external control type one-way balance valve one, the outlet of the two-position electromagnetic control valve two is connected with the inlet of the overflow valve, and the outlet of the overflow valve is connected with the B port channel of the multifunctional valve block. The multifunctional valve block of the technical scheme is a pull arm hook lowering pressure protection control function module, when it is required to lower the pull arm hook to the end and to protect the pull arm hook from collision, the quick lowering control module is integrated on the basis.
[0017] As a further improvement of the utility model, the A port channel external control type one-way balance valve of the multifunctional valve block is connected with a two-position electromagnetic reversing valve with built-in damping on the pipeline of the rodless cavity of the swing arm oil cylinder, and the outlet of the two-position electromagnetic reversing valve is connected with a damping hole.
[0018] As a further improvement of the utility model, the swing arm hook control module comprises a swing oil cylinder, the rear support control module comprises a support oil cylinder, and the swing arm mechanism control module comprises a swing arm oil cylinder, which is hinged to the chassis of the swing arm truck, and a swing arm is hinged to the chassis, the swing arm is hinged to the swing wall oil cylinder, the front end of the swing arm is hinged to the front arm through a swing pin shaft, the front arm is provided with a swing arm hook, the swing arm is hinged to the swing oil cylinder, the swing oil cylinder is hinged to the front arm, and the support oil cylinder is arranged at the rear part of the lower side of the chassis.
[0019] The swing arm hook can be driven by the hydraulic oil cylinder to swing by a certain angle, so that the lowering height of the swing arm hook can be adjusted within a certain range, although the height of the sanitation garbage box body has been standardized, but in some special occasions or for the box bodies of other industries, the height will change, at this time, the lowering height of the swing arm hook can be adjusted by controlling the swing arm oil cylinder to complete the box pulling, the swing arm oil cylinder is provided with a hydraulic lock, which can reliably lock the oil in the oil cylinder and ensure that the oil cylinder stays at any position.
[0020] A support oil cylinder is arranged on each of the two sides of the rear part of the swing arm, which is used to balance the force of the garbage box when loading the box filled with garbage, so as to prevent the swing arm truck from tilting due to the light head and heavy feet. Through the related hydraulic control valve, the support oil cylinder can be extended at two speeds of differential quick and normal, and the support oil cylinder can be reliably locked on the ground by the hydraulic control one-way valve. Since the support oil cylinder has high pressure, the pressure of the support oil cylinder can be slowly discharged before the support is collected, so as to avoid the reverse pressure impact and delay the severe deformation of the structure.
[0021] The swing arm oil cylinder is integrated with a multifunctional control valve block, which can realize various functional requirements of the swing arm hook, including quick lowering function, quick release switchable function, emergency slow release function and swing arm hook pressure protection function, etc. Each function can be selected as a configuration, and the integrated functions can be selected according to the actual situation and use requirements.
[0022] Compared with the prior art, the utility model has the advantages of 1, the height of the arm hook can be adjusted, and more garbage cans can be matched. 2, the amplitude cylinder oil way has differential function, when the arm hook is lowered, quick movement can be realized, when the arm hook needs slow speed, the differential function can be cut off, when the garbage can is unloaded, the garbage can be quickly unloaded, the differential quick and slow speed can be switched according to the use condition, the working time can be shortened, and the working efficiency can be effectively improved. 3, the amplitude cylinder oil way can be equipped with differential switching function, when the garbage can is lifted, in the beginning, the garbage can is lifted quickly in differential mode, when the garbage can is lifted to a certain height, the differential is switched off and the normal speed is used, at this time, the material is slowly poured out from the garbage can, so that the lifting time is reduced, and the material is stably poured out, and no danger occurs. 4, the amplitude cylinder oil way can be equipped with arm hook safety protection function, when the arm hook loads the garbage can, the arm hook is lowered to the same height with the hook ring of the garbage can, then the arm hook is connected, when the arm hook accidentally hits the garbage can in the connecting process, the pressure in the amplitude cylinder is unloaded, so that the arm hook can be retracted, the safety of the hard impact is guaranteed, and the structure is prevented from being deformed by impact. 5, the amplitude cylinder oil way can be equipped with emergency slow release function, when the arm hook has faults in the process of loading the garbage can, unloading and placing the garbage can, the garbage can can be slowly lowered to the position, and the system and personnel safety are guaranteed. 6, the rear support cylinder control module adopts two independent control modules, can adapt to the situation that the road surface height is uneven, the differential quick extension improves the lifting efficiency, the cone valve core guarantees the reliable pressure maintaining of the system, when retracted, the pressure is released in advance, the original height of the upper loader is slowly recovered, the high pressure impact of the system is avoided, the slow rigid deformation of the structure of the upper loader mechanism is guaranteed, and the comfort is improved. 7, the multifunctional control valve block is directly installed on the amplitude cylinder oil port, and there is no pipeline connection in the middle, so that the danger of sudden failure of the balance function caused by the rupture of the oil pipe can be effectively avoided. BRIEF DESCRIPTION OF DRAWINGS
[0023] Figure 1 It is a structure schematic view of the arm hook control module of the utility model.
[0024] Figure 2 is a structure schematic view of the rear support control module.
[0025] Figure 3 It is a structure view of the arm hook quick lowering control function of the arm mechanism control module.
[0026] Figure 4 It is a structure view of the arm hook quick lowering switching control function of the arm mechanism control module.
[0027] Figure 5 It is a structure view of the arm hook lowering pressure protection control function of the arm mechanism control module.
[0028] Figure 6 It is a structure view of the arm emergency slow release control function of the arm mechanism control module.
[0029] Figure 7 This is the structural diagram of the pulling arm mechanism.
[0030] Figure 8 This is a connection diagram of the corresponding modules of the swing cylinder, support cylinder and swing arm cylinder with the pneumatic multi-way valve and hydraulic plunger pump.
[0031] Among them, 1. pulling arm, 2. pulling arm hook, 3. swing pin, 4. underframe, 5. pneumatically controlled multi-way valve, 6. hydraulic plunger pump, 11. two-way hydraulic lock, 12. swing cylinder, 13. one-way throttle valve, 21. hydraulic oil tank, 22. overflow valve, 23. first and second solenoid valves, 24. second and second solenoid valves, 25. damping hole, 26. third and third solenoid valves, 27. supporting cylinder, 28. proximity switch, 29. fourth and second solenoid valves, 210. one-way valve, 31. balancing valve one, 32. one-way valve one, 33. swing arm cylinder, 34. balancing valve two, 35. one-way valve two, 36. one-way throttle valve, 37. two-position electromagnetic control valve two, 38. overflow valve, 39. two-position electromagnetic reversing valve, 40. damping hole, 41. two-position electromagnetic control valve one, 42. one-way valve three. DETAILED DESCRIPTION
[0032] like Figures 1-8 As shown, a hydraulic control system for a boom truck includes a hydraulic oil tank 21, a hydraulic plunger pump 6, an air-controlled multi-way valve 5, and also includes a boom hook 2 control module, a rear support control module and a boom mechanism control module.
[0033] The hydraulic piston pump 6 is installed on the chassis power take-off and is connected to the air-controlled multi-way valve 5. The hydraulic piston pump 6 provides power for each action mechanism installed on the arm to complete the basic actions of the arm hook 2, such as hooking, unloading, and supporting.
[0034] The hooklift 2 control module includes a two-way hydraulic lock 11, a one-way throttle valve 13, and a swing cylinder 12. One outlet of the two-way hydraulic lock 11 is connected to the rodless chamber of the swing cylinder 12, and the other outlet is connected to the inlet of the one-way throttle valve 13. The outlet of the one-way throttle valve 13 is connected to the rod chamber of the swing cylinder 12. Both inlets of the two-way hydraulic lock 11 are connected to the pneumatic multi-way valve 5. The two inlets of the two-way hydraulic lock 11 are respectively connected to the A1 and B1 oil ports of the pneumatic multi-way valve 5.
[0035] The rear support control module comprises four two-position electromagnetic valves, a support oil cylinder 27, a proximity switch 28, a one-way valve 210, a damping hole 25, an overflow valve 22, a hydraulic oil tank 21 and connecting pipelines. The outlet of the one-way valve 210 is connected to the first two-position electromagnetic valve 23 and the fourth two-position electromagnetic valve 29 through a three-way joint. The outlet of the first two-position electromagnetic valve 23 is connected to the second two-position electromagnetic valve 24 and the rodless cavity of the support oil cylinder 27 through a three-way joint. The outlet of the fourth two-position electromagnetic valve 29 is connected to the third two-position electromagnetic valve 26 and the rod cavity of the support oil cylinder 27 through a three-way joint. The outlet of the second two-position electromagnetic valve 24 is connected to the hydraulic oil tank 21 through the damping hole 25. The outlet of the third two-position electromagnetic valve 26 is connected to the hydraulic oil tank 21. The rodless cavity of the support oil cylinder 27 is integrated with the proximity switch 28. The inlet of the one-way valve 210 is connected to the air-controlled multi-way valve 5. A pipeline for installing the overflow valve 22 is arranged between the pipeline between the second two-position electromagnetic valve 24 and the hydraulic oil tank 21 and the pipeline between the one-way valve 210 and the air-controlled multi-way valve 5. The outlet of the overflow valve 22 is close to the hydraulic oil tank 21. The inlet of the one-way valve 210 is connected to the A2 oil port of the air-controlled multi-way valve 5.
[0036] The pull arm mechanism control module comprises a swing arm oil cylinder 33 and a multifunctional valve block integrated on the swing arm oil cylinder 33. The A port channel of the multifunctional valve block is connected to the inlet of the outer control type one-way balance valve 31. The outlet of the balance valve 31 is connected to the rodless cavity of the swing arm oil cylinder 33 through one side of a three-way joint and connected to the inlet of the one-way valve 32 through the other side. The outlet of the one-way valve 32 is connected to the outlet of the outer control type one-way balance valve 34. The control oil channel of the inlet of the outer control type one-way balance valve 31 is connected with the one-way throttle valve 36. The outlet of the one-way throttle valve 36 is connected to the control cavity of the outer control type one-way balance valve 34. The B port channel of the multifunctional valve block is connected to the inlet of the one-way valve 35. The outlet of the one-way valve 35 is connected to the rod cavity of the swing arm oil cylinder 33 through one side of a three-way joint and connected to the inlet of the outer control type balance valve 34 through the other side. The control oil channel of the inlet of the one-way valve 35 is connected to the pilot cavity of the outer control type balance valve 31 and the spring cavity of the outer control type balance valve 34, respectively. The multifunctional valve block can be installed with different inserts to realize different functions according to needs. The multifunctional valve block of the technical solution is a quick lowering control function module. The swing arm oil cylinder 33 is provided with at least two.
[0037] The control oil channel of the outer control type balance valve 31 is connected with the one-way valve 42 and the two-position electromagnetic control valve 41. The multifunctional valve block of the technical solution is a quick lowering switching control function module, which is used to realize the switching off of the differential lowering function at any time during the pull arm quick lowering process and is integrated on the basis of the quick lowering control function module.
[0038] The two-position electromagnetic control valve two 37 is connected to the one-way balance valve one 31 of the A port channel of the multifunctional valve block, the outlet of the two-position electromagnetic control valve two 37 is connected to the inlet of the overflow valve 38, and the outlet of the overflow valve 38 is connected to the B port channel of the multifunctional valve block.
[0039] The two-position electromagnetic reversing valve 39 with an internal damper is connected to the pipeline of the rodless cavity of the swing arm oil cylinder 33, and the outlet of the two-position electromagnetic reversing valve 39 is connected to the damping hole 40.
[0040] The control module of the swing arm hook 2 comprises the swing oil cylinder 12, the rear support control module comprises the support oil cylinder 27, and the swing arm mechanism control module comprises the swing arm oil cylinder 33.
[0041] The specific implementation steps of the utility model are as follows:
[0042] The carriage detachable garbage truck mainly comprises a pulling box operation, a placing box operation and a lifting and unloading operation.
[0043] Support oil cylinder control: when the garbage truck needs to be transported, the carriage can be aligned with the garbage box and a certain distance is reserved, the chassis plunger pump is started to provide high pressure oil for the upper-mounted hydraulic elements, the rear support oil cylinder needs to be controlled to extend and support the ground first, at this time the high pressure oil enters the rear support control module, the two-position electromagnetic valve one is powered on, the electromagnetic valve one works in the left position, the pressure oil opens the check valve and enters the support oil cylinder rodless cavity through the electromagnetic valve one, the hydraulic oil in the support oil cylinder rod cavity enters the rodless cavity through the two-position electromagnetic valve four and the oil inlet, the oil way is differentially connected, the support oil cylinder quickly extends, when the piston rod is about to contact the ground, fine adjustment is needed, at this time the two-position electromagnetic valve three can be controlled to reverse, at this time the oil in the rod cavity will directly return to the oil tank through the electromagnetic valve three, the oil cylinder extends slowly, which can improve the adjustment accuracy. Because the two sets of support oil cylinders are distributed on both sides of the chassis and are independently controlled, the two oil cylinders can be controlled respectively to adapt to the road surface to ensure reliable support. In order to support reliably, the oil cylinder support will lift the entire upper-mounted tail part by a certain distance, after the box is pulled, the electromagnetic valve two is controlled to reverse first, the support oil cylinder rodless cavity is first relieved under the action of the damping hole, so that the upper-mounted tail part slowly drops to the original height, then the electromagnetic valve four is controlled to act, the pressure oil enters the rod cavity through the check valve and the electromagnetic valve four, and the hydraulic oil in the rodless cavity returns to the oil tank through the electromagnetic valve two and the damping hole. When the support oil cylinder is retracted to the position, the proximity switch integrated on the support oil cylinder will sense the piston and send a signal, prompting the driver that the support has been retracted to the position, and the vehicle can move.
[0044] Pulling box operation control: when preparing to load the garbage box, the pulling arm hook needs to be lowered first, the high pressure oil enters the pulling arm control module, the high pressure oil enters the variable amplitude oil cylinder rodless cavity through A port and the outer control type balance valve one, on one hand, it enters the control flow passage and enters the control cavity of the outer control type balance valve two through the check valve, the hydraulic oil in the variable amplitude oil cylinder rodless cavity is blocked by the outer control type balance valve two and the check valve two and cannot flow, when the pressure rises only, the pressure oil enters the control cavity of the outer control type balance valve two and opens the spring, the balance valve two is opened, the hydraulic oil in the rod cavity of the variable amplitude oil cylinder enters the rodless cavity through the balance valve two and the check valve one, realizing differential connection, and the variable amplitude oil cylinder quickly extends.
[0045] When the integrated lowering switching control function is integrated, when the variable amplitude oil cylinder is lowered to a certain height, the proximity switch installed on the chassis senses the lifting arm and sends a signal to control the two-position electromagnetic valve one to be powered on, only the hydraulic oil in the rod cavity of the variable amplitude oil cylinder can flow out through the electromagnetic reversing valve one through B port, the differential function is cut off, the pulling arm hook realizes normal speed lowering, and the pulling arm hook and the box hook ring are accurately connected.
[0046] When the pull arm hook pressure protection function is integrated, when the pull arm hook is lowered to a certain position, the two solenoid valves are controlled to be powered, at this time the overflow valve functions to limit the pressure of the rodless chamber of the luffing cylinder, the pressure is set to be much smaller than the set pressure of the main control valve, when the pull arm hook is lowered to the lowest point, if the garbage can is accidentally touched during the docking, the pressure in the cylinder can be discharged through the overflow valve, thereby avoiding the deformation of the structure when docking.
[0047] When the emergency slow release function is integrated, when the pull arm hook is in the process of pulling the box, unloading and placing the box, if the hydraulic system fails and the operation cannot continue normally, the garbage can will be lifted in the air, at this time, if the garbage can is not lowered smoothly, on the one hand, the garbage can is very heavy, and when it is full of garbage, it is even heavier, so it is very dangerous, on the other hand, it also brings inconvenience and danger to the maintenance work, so it is best to manually control the box to fall into place, therefore, the hydraulic system can ensure that the box can still fall smoothly when the hydraulic power is suddenly lost. At this time, the two-way valve three is controlled to change direction, the hydraulic oil in the rodless chamber of the luffing cylinder will be pressed out of the cylinder under the action of the weight of the box, the damping hole not only delays the falling speed of the box, but also enables the return oil to generate a certain back pressure without passing through the balance valve one, so as to prevent the cylinder from stalling and ensure slow and smooth falling.
[0048] Pull arm hook swing control: when a non-standard height box needs to be loaded, the swing cylinder oil circuit is controlled to act, high-pressure oil enters the rodless chamber of the swing cylinder through the hydraulic lock, and the oil in the chamber with the rod flows out through the one-way throttle valve and the hydraulic lock. The oil cylinder extends, and the speed of the oil cylinder can be adjusted by adjusting the size of the one-way throttle valve, at this time, under the drive of the swing cylinder, the pull arm hook will rotate around the swing pin shaft, and the height of the hook can be adjusted in a certain range to match the box. The set hydraulic lock can reliably lock the cylinder to ensure that the swing arm does not swing during loading.
[0049] The above-mentioned multi-way valve group uses compressed air control, compared with electromagnetic control, the air control system has the advantages of larger acting force, more reliable and flexible action, more compact structure, lower use cost and the like.
[0050] The balance valve block principle of the hydraulic system can also be used on lifting equipment such as cranes.
[0051] The utility model is not limited to the above-mentioned embodiments, on the basis of the technical scheme disclosed in the utility model, those skilled in the art can make some substitutions and deformations to some technical features according to the disclosed technical content without creative labor, and these substitutions and deformations are all within the protection scope of the utility model.
Claims
1. A hydraulic control system for a boom truck, comprising a hydraulic oil tank, a hydraulic plunger pump, and an air-controlled multi-way valve, characterized in that: It also includes a hook arm control module, a rear support control module and a hook arm mechanism control module; the hydraulic plunger pump is installed on the chassis power take-off, and the hydraulic plunger pump is connected to the air-controlled multi-way valve; the hook arm control module includes a two-way hydraulic lock, a one-way throttle valve and a swing oil cylinder, one end outlet of the two-way hydraulic lock is connected to the rodless chamber of the swing oil cylinder, and the other end outlet is connected to the one-way throttle valve inlet, the one-way throttle valve outlet is connected to the rod chamber of the swing oil cylinder, and the two inlets of the two-way hydraulic lock are both connected to the air-controlled multi-way valve; the rear support control module includes four two-position solenoid valves, a support oil cylinder, a proximity switch, a one-way valve, a damping hole, a relief valve, a hydraulic oil tank and connecting pipes, The one-way valve outlet is connected to the first and second solenoid valves and the fourth two-way solenoid valve through a three-way connection. The first and second solenoid valve outlets are connected to the second and second solenoid valves and the rodless cavity of the support cylinder through a three-way connection. The fourth and second solenoid valve outlets are connected to the third and second solenoid valves and the rod cavity of the support cylinder through a three-way connection. The second and second solenoid valve outlets return to the hydraulic oil tank through the damping hole. The third and second solenoid valve outlets are connected to the hydraulic oil tank. The rodless cavity of the support cylinder is integrated with a proximity switch. The one-way valve inlet is connected to the air-controlled multi-way valve. A pipeline for installing an overflow valve is also provided between the pipeline between the second and second solenoid valves and the hydraulic oil tank and the pipeline between the one-way valve and the air-controlled multi-way valve. The outlet of the overflow valve is close to the hydraulic 1, and the oil tank is connected with the oil tank of the one-way balancing valve of the external control type. The oil tank is provided with an oil tank, and the control oil passage of the oil tank is connected with the oil tank of the one-way balancing valve of the external control type. The control oil passage of the oil tank is connected with a one-way throttle valve, and the outlet of the one-way throttle valve is connected with the control chamber of the one-way balancing valve of the external control type. The oil tank is provided with an oil tank, and the control oil passage of the oil tank is connected with the oil tank of the one-way balancing valve of the external control type. The control oil passage of the oil tank is connected with the one-way throttle valve, and the outlet of the one-way throttle valve is connected with the control chamber ... At the inlet of valve two, there is a control oil channel at the inlet of check valve two, which is respectively connected to the pilot chamber of externally controlled balancing valve one and the spring chamber of externally controlled balancing valve two; the control oil channel of the externally controlled balancing valve one is connected to the check valve three and the two-position electromagnetic control valve one; the A-port channel of the multifunctional valve block is connected to the two-position electromagnetic control valve two before the node of the externally controlled one-way balancing valve one, and the outlet of the two-position electromagnetic control valve two is connected to the inlet of the relief valve, and the outlet of the relief valve is connected to the B-port channel of the multifunctional valve block; the A-port channel of the multifunctional valve block is connected to the pipeline of the externally controlled one-way balancing valve one connected to the rodless chamber of the swing arm oil cylinder, and a two-position electromagnetic reversing valve with built-in damping is connected to the outlet of the two-position electromagnetic reversing valve;The hooklift control module includes a swing cylinder, the rear support control module includes a support cylinder, and the arm mechanism control module includes a swing cylinder. The swing cylinder is hinged to the underframe of the armlift truck, and the arm is hinged to the underframe. The extended end of the piston rod of the swing cylinder is hinged to the arm, and the front end of the arm is hinged to the forearm via a swing pin. The end of the forearm is provided with a hooklift, and the arm is hinged to the swing cylinder. The extended end of the piston rod of the swing cylinder is hinged to the forearm. The support cylinder is arranged at the rear of the lower side of the underframe.