Hydraulic control system, hydraulic control method and charging trolley

Abstract

The invention provides a hydraulic control system, a hydraulic control method and a charging trolley. The hydraulic control system comprises a hydraulic cylinder, a protection module, a control module, an electric control lifting module, a first oil pipe and a manual descending module. The hydraulic cylinder comprises a rod cavity and a rodless cavity; the electric control lifting module is connected with a rod cavity and a rodless cavity of the hydraulic cylinder and used for inputting or outputting fluid into or out of the rod cavity and the rodless cavity under the control of the control module. The manual descending module comprises a manual pump connected with the control end of the logic valve, and the manual pump is used for conveying fluid to the logic valve through manual pressurization so as to open or close the logic valve; the protection module comprises a throttle valve, and the aperture of the throttle valve is adjustable; the logic valve is arranged on the first oil pipe, the first oil pipe is connected with the rodless cavity through the throttling valve, and when the logic valve is opened, fluid in the rodless cavity is released through the throttling valve and the first oil pipe. By arranging the protection module and the manual descending module, the problem that the construction platform stalls during pipe explosion or the construction platform cannot be lowered under the abnormal working condition is solved.

Description

Technical Field

[0001] The present application relates to the technical field of tunnel charging and blasting, and in particular to a hydraulic control system, a hydraulic control method and a charging trolley. Background Art

[0002] With the development of domestic transportation construction, the number of highway tunnel construction is increasing, and the safety requirements for tunnel construction are constantly improving. The construction environment inside the tunnel is harsh, with high dust concentration and high humidity, which leads to a significant increase in the failure rate of equipment when operating in the tunnel. When the charging trolley is operating at the face, it provides a stable construction platform for loading explosives for construction personnel. During the deployment of the construction platform, the hydraulic system must be completely locked to ensure no leakage, so as to ensure that the construction platform is stable and does not sink.

[0003] When the construction platform is at the face, if the equipment is subjected to additional impact or the hose is damaged, the hydraulic cylinder supporting the lock is very likely to burst: once a single hydraulic cylinder bursts, the platform will be overloaded and the hydraulic cylinder that has not burst will not be able to be lowered normally; if two hydraulic cylinders burst at the same time, the support lock will fail and the mechanism will fall rapidly, posing a great safety threat to the operator.

[0004] In addition, in the event of an electrical system failure or a problem with the pressure control system, the trolley operating platform must be lowered urgently to ensure the safe evacuation of personnel. The trolley can only be moved after it is lowered and retracted to prevent safety accidents caused by the high center of gravity movement in the deployed state. However, traditional circuits lack an emergency lowering function, or the emergency valve is installed on the hydraulic cylinder. Once a problem occurs, the safety of directly operating the emergency valve is low. Summary of the invention

[0005] In order to at least overcome the above-mentioned deficiencies in the prior art, the purpose of the present application is to provide a hydraulic control system, a hydraulic control method and a charging trolley.

[0006] The present application provides a hydraulic control system applied to a construction platform of a charging trolley, including a hydraulic cylinder, a protection module, a control module, an electric-controlled lifting module, a first oil pipe and a manual lowering module.

[0007] The hydraulic cylinder includes a rod chamber and a rodless chamber.

[0008] The electrically controlled lifting module is respectively connected to the rod chamber and the rodless chamber of the hydraulic cylinder, and is used to input or output fluid to or from the rod chamber and the rodless chamber respectively under the control of the control module.

[0009] The manual lowering module includes a manual pump connected to the control end of the logic valve, and the manual pump is used to deliver fluid to the control end of the logic valve by manual pressurization to open or close the logic valve.

[0010] The protection module includes a first throttle valve having an adjustable aperture; the logic valve is arranged on a first oil pipe, and the first oil pipe is connected to the rodless chamber via the first throttle valve; when the logic valve is opened, the fluid in the rodless chamber is released via the first throttle valve and the first oil pipe.

[0011] In a possible implementation manner, the protection module further includes a first explosion-proof valve, a second explosion-proof valve, and a second throttle valve; and the hydraulic cylinder further includes a second hydraulic cylinder.

[0012] The rodless chamber is connected to the first oil pipe via the explosion-proof valve, and the explosion-proof valve is used to prevent the fluid in the rodless chamber from flowing into the first oil pipe via the explosion-proof valve when the first oil pipe explodes.

[0013] The first oil pipe is connected to the rodless chamber of the second hydraulic cylinder via the second throttle valve; when the logic valve is opened, the fluid in the rodless chamber of the second hydraulic cylinder is released via the second throttle valve and the first oil pipe.

[0014] In a possible implementation, the manual descent module further includes a third throttle valve, and the fluid in the rodless chamber is released sequentially through the first throttle valve, the first oil pipe and the third throttle valve, and the third throttle valve is used to further control the flow rate of the fluid in the first oil pipe.

[0015] In a possible implementation, the manual descending module further includes a pressure relief valve, and the pressure relief valve is used to control the pressure of the fluid delivered by the manual pump.

[0016] In a possible implementation manner, the diameter of the throttle hole of the throttle valve is:

[0017]

[0018] Wherein S is the cross-sectional area of ​​the rodless chamber of the hydraulic cylinder, V is the descending speed of the construction platform, C is the flow coefficient, ρ is the fluid density, and Δp is the pressure difference.

[0019] The pressure difference is:

[0020]

[0021] Wherein G is the weight of the construction platform.

[0022] In a possible implementation, the electrically controlled lifting module includes a second oil pipe, a third oil pipe and a balancing valve. The second oil pipe is connected to the rodless chamber via the balancing valve, and the third oil pipe is connected to the rod chamber via the balancing valve. The balancing valve is used to provide reverse thrust to the construction platform during its lowering process, so that it can be lowered smoothly.

[0023] In a possible implementation, the electrically controlled lifting module further includes a pressure reducing valve, which is connected to the balancing valve and is used to reduce the pressure of the high-pressure fluid in the third oil pipe and allow the decompressed fluid to open a reverse flow valve of the balancing valve.

[0024] In a possible implementation, the electrically controlled lifting module further includes a reversing valve, which is connected to the hydraulic cylinder via the balancing valve; the reversing valve is used to control the construction platform to be in a raised state or a lowered state under the control of the control module.

[0025] The present application also provides a hydraulic control method, which is applied to any of the above hydraulic control systems, comprising:

[0026] Setting the diameter of the throttle hole in the throttle valve;

[0027] The manual pump is controlled to deliver fluid to the control end of the logic valve through manual pressure to open or close the logic valve.

[0028] The present application also provides a charging trolley, comprising a construction platform and any one of the above-mentioned hydraulic control systems, wherein the hydraulic control system can control the descent of the construction platform through the above-mentioned hydraulic control method.

[0029] Based on any one of the above aspects, a hydraulic control system, a hydraulic control method and a charging trolley provided in the embodiments of the present application solve the problem of the construction platform stalling when a pipe bursts or the construction platform being unable to be lowered under abnormal working conditions by setting a protection module and a manual descent module. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 One of the schematic diagrams of the hydraulic control system provided in the embodiment of the present application;

[0032] Figure 2 The second schematic diagram of the hydraulic control system provided in the embodiment of the present application;

[0033] Figure 3 The third schematic diagram of the hydraulic control system provided in the embodiment of the present application;

[0034] Figure 4 A fourth schematic diagram of a hydraulic control system provided in an embodiment of the present application;

[0035] Figure 5 A fifth schematic diagram of a hydraulic control system provided in an embodiment of the present application;

[0036] Figure 6 Schematic diagram six of the hydraulic control system provided in the embodiment of the present application;

[0037] Figure 7 A flowchart of a hydraulic control method provided in an embodiment of the present application;

[0038] Figure 8 A schematic diagram of the structure of the charge trolley provided in an embodiment of the present application.

[0039] Icons: 10-hydraulic control system; 20-hydraulic control method; 30-charging trolley; 100-hydraulic cylinder; 101-first hydraulic cylinder; 102-second hydraulic cylinder; 110-rod chamber; 120-rodless chamber; 200-protection module; 210-first throttle valve; 220-second throttle valve; 230-first explosion-proof valve; 240-second explosion-proof valve; 300-electrically controlled lifting module; 310-balancing valve; 320-second oil pipe; 330-third oil pipe; 340-pressure reducing valve; 350-reversing valve; 410-first oil pipe; 500-manual descent module; 510-logic valve; 520-manual pump; 530-third throttle valve; 540-pressure relief valve; 900-construction platform; 910-scissors-type lifting mechanism. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0042] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0043] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0044] It should be noted that, in the absence of conflict, different features in the embodiments of the present application can be combined with each other; at the same time, the "connection" mentioned in the present application represents a connection method in a physical sense, rather than an electrical connection or other connection methods.

[0045] The specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings.

[0046] The embodiments of the present application provide a hydraulic control system 10 , a hydraulic control method 20 and a charge loading trolley 30 .

[0047] This application provides a hydraulic control system 10, please refer to Figure 1 The construction platform 900 applied to the charging trolley 30 includes a hydraulic cylinder 100, a protection module 200, a control module, an electric-controlled lifting module 300, a first oil pipe 410 and a manual lowering module 500.

[0048] The hydraulic cylinder 100 includes a rod chamber 110 and a rodless chamber 120 .

[0049] The electric-controlled lifting module 300 is respectively connected to the rod chamber 110 and the rodless chamber 120 of the hydraulic cylinder 100 , and is used to input or output fluid to or from the rod chamber 110 and the rodless chamber 120 under the control of the control module.

[0050] The manual lowering module 500 includes a manual pump 520 connected to the control end of the logic valve 510 , and the manual pump 520 is used to deliver fluid to the control end of the logic valve 510 by manual pressurization to open or close the logic valve 510 .

[0051] The protection module 200 includes a first throttle valve 210, and the aperture of the first throttle valve 210 is adjustable; the logic valve 510 is arranged on the first oil pipe 410, and the first oil pipe 410 is connected to the rodless chamber 120 via the first throttle valve 210. When the logic valve 510 is opened, the fluid in the rodless chamber 120 is released via the first throttle valve 210 and the first oil pipe 410.

[0052] When the construction platform 900 of the charging trolley 30 encounters an electrical system failure or an abnormal pressure control system, it must be lowered urgently to ensure that the personnel and the charging trolley 30 can be safely evacuated from the tunnel. In order to avoid safety accidents that may be caused by high center of gravity movement when the construction platform 900 is deployed, the charging trolley 30 must be moved only after the construction platform 900 is lowered and fully retracted. Therefore, in this embodiment, a protection module 200 and a manual lowering module 500 are provided, which can lower the construction platform 900 under abnormal working conditions without stalling.

[0053] It should be noted that, in the embodiment provided in the present application, the hydraulic control system 10 also includes an oil tank, which is used to provide high-pressure fluid to the hydraulic control system 10 or recover the fluid released therefrom, and the fluid is hydraulic oil; the high-pressure fluid refers to the high-pressure hydraulic oil pressurized in the oil tank by a high-pressure oil pump.

[0054] For example, in this embodiment, the manual pump 520 opens the logic valve 510 by delivering high-pressure hydraulic oil to the control end of the logic valve 510 .

[0055] In addition, in the embodiment provided in the present application, the manual pump 520 in the manual descent module 500 can also be replaced by a pneumatic pump, etc. The pneumatic pump opens the logic valve 510 by delivering compressed gas to the control end of the logic valve 510.

[0056] In one possible implementation, please refer to Figure 2 The protection module 200 further includes a second throttle valve 220 , a first explosion-proof valve 230 and a second explosion-proof valve 240 ; the hydraulic cylinder 100 includes a first hydraulic cylinder 101 and a second hydraulic cylinder 102 .

[0057] The rodless chamber 120 is connected to the first oil pipe 410 via the explosion-proof valve, and the explosion-proof valve is used to prevent the fluid in the rodless chamber 120 from flowing into the first oil pipe 410 via the explosion-proof valve when the first oil pipe 410 explodes.

[0058] The first oil pipe 410 is connected to the rodless chamber 120 of the second hydraulic cylinder 102 via the second throttle valve 220 ; when the logic valve 510 is opened, the fluid in the rodless chamber 120 of the second hydraulic cylinder 102 is released via the second throttle valve 220 and the first oil pipe 410 .

[0059] Optionally, see Figure 8, the hydraulic cylinder 100 is installed on the scissor-type lifting mechanism 910 of the construction platform 900. The construction platform 900 shown in the figure is equipped with two scissor-type lifting mechanisms, so when the construction platform 900 is unfolded, the hydraulic cylinder 100 is located at a higher position. In order to ensure the safety of operators under abnormal working conditions, the manual pump 520 is placed in a position that is easy to operate and far away from the construction platform 900. Therefore, a longer first oil pipe 410 is required to connect the first throttle valve 210 and the logic valve 510 close to the manual pump 520. However, this layout increases the length of the first oil pipe 410, which has the risk of pipe bursting.

[0060] In order to enable the construction platform to slowly descend when the first oil pipe 410 bursts, an explosion-proof valve is specially provided in the system to enhance the safety and reliability of this embodiment.

[0061] For example, when a pipe burst occurs, the explosion-proof valve will automatically lock the oil circuit of the rodless chamber 120, thereby effectively preventing the mechanism from being lowered due to stalling. At the same time, when the construction platform 900 is operating normally, the hydraulic oil in the rodless chamber 120 can flow freely through the first explosion-proof valve 230 and the second explosion-proof valve 240 to prevent unbalanced load.

[0062] In addition, under abnormal working conditions, the first throttle valve 210 and the second throttle valve 220 can control the flow of the fluid flowing through the first oil pipe 410, and release the hydraulic oil in the rodless chamber 120 through the manual descending module 500 to slowly descend the construction platform 900.

[0063] In one possible implementation, please refer to Figure 3 The manual descent module 500 also includes a third throttle valve 530. The fluid in the rodless chamber 120 is released in sequence through the first throttle valve 210, the first oil pipe 410 and the third throttle valve 530. The third throttle valve 530 is used to control the flow rate of the fluid in the first oil pipe 410 when it is released.

[0064] In this embodiment, the manual lowering module 500 further includes a third throttle valve 530. Under abnormal working conditions, the third throttle valve 530 can adjust the flow rate of the hydraulic oil according to actual needs, so that the hydraulic cylinder 100 contracts more smoothly, avoiding the impact caused by excessive speed, thereby protecting various components of the system, reducing wear and failure rate, preventing system overload, and ensuring the safety of operators.

[0065] In one possible implementation, please refer to Figure 4 The manual descending module 500 further includes a pressure relief valve 540 , and the pressure relief valve 540 is used to control the pressure of the fluid delivered by the manual pump 520 .

[0066] In this embodiment, in order to ensure the safety of operation, a pressure relief valve 540 is designed. The pressure relief valve 540 can control the pressure level of the hydraulic oil delivered by the manual pump 520. By setting the threshold of the pressure relief valve 540, the maximum pressure in the system can be effectively limited to prevent potential damage to the equipment or operators due to excessive pressure.

[0067] In an emergency or during manual operation, the pressure relief valve 540 can be automatically activated. When the system pressure exceeds the preset safety limit, the pressure relief valve 540 will open to release excess hydraulic oil, thereby reducing the system pressure and ensuring the normal operation of the manual pump 520 and the entire hydraulic system. This design improves the safety of the system and also ensures that the construction platform 900 can be lowered smoothly and safely even under abnormal working conditions.

[0068] In a possible implementation manner, the diameter of the throttle hole of the throttle valve is:

[0069]

[0070] Wherein S is the cross-sectional area of ​​the rodless chamber 120 of the hydraulic cylinder 100, V is the descending speed of the construction platform 900, C is the flow coefficient, ρ is the fluid density, and Δp is the pressure difference.

[0071] The pressure difference is:

[0072]

[0073] Wherein G is the weight of the construction platform 900.

[0074] In this embodiment, by adjusting the diameter of the throttle hole in the throttle valve, the amount of hydraulic oil flowing through the oil pipe can be accurately controlled, thereby adjusting the retraction speed of the hydraulic cylinder 100, effectively preventing the construction platform 900 from falling rapidly due to loss of control.

[0075] In one possible implementation, please refer to Figure 5 The electric-controlled lifting module 300 includes a balancing valve 310, a second oil pipe 320 and a third oil pipe 330. The second oil pipe 320 is connected to the rodless chamber 120 via the balancing valve 310, and the third oil pipe 330 is connected to the rod chamber 110 via the balancing valve 310. The balancing valve 310 is used to provide a reverse thrust to the construction platform 900 during its lowering process, so that it can be lowered smoothly.

[0076] The electric lifting module 300 precisely controls the input and output of the fluid through the control module to adjust the lifting and lowering of the construction platform 900. In this embodiment, under the command of the control module, high-pressure hydraulic oil can be input into the rod chamber 110 or the rodless chamber 120 through the high-pressure oil pump, and at the same time, the rodless chamber 120 or the rod chamber 110 releases hydraulic oil into the oil tank, thereby realizing the lifting and lowering action of the construction platform 900.

[0077] For example, when the construction platform 900 needs to be lifted, the control module controls the electric lifting module 300 to input high-pressure hydraulic oil to the rodless chamber 120 of the hydraulic cylinder 100 through the high-pressure oil pump, and releases hydraulic oil from the rod chamber 110 to the oil tank. At this time, under the push of the high-pressure hydraulic oil, the piston rod of the hydraulic cylinder 100 will extend outward, pushing the construction platform 900 up.

[0078] On the contrary, when the construction platform 900 needs to be lowered, the control module controls the electric control lifting module 300 to operate in the reverse direction, that is, the high-pressure hydraulic oil is input to the rod chamber 110 of the hydraulic cylinder 100 through the high-pressure oil pump, and the hydraulic oil is released from the rodless chamber 120 to the oil tank; at the same time, the balance valve 310 provides reverse thrust for the construction platform 900 to prevent it from stalling and descending. In this way, the piston rod retracts under the pressure of the hydraulic oil, driving the construction platform 900 to descend.

[0079] In one possible implementation, please refer again to Figure 5 The electric-controlled lifting module 300 also includes a pressure reducing valve 340 , which is connected to the balancing valve 310 and is used to reduce the pressure of the high-pressure fluid in the third oil pipe 330 and allow the decompressed fluid to open the reverse flow valve of the balancing valve 310 .

[0080] In this embodiment, the electric control lifting module 300 further includes a pressure reducing valve 340, which is directly connected to the balancing valve 310 and is used to reduce the pressure of the high-pressure hydraulic oil in the third oil pipe 330 under the control of the control module, so as to ensure that the fluid after the pressure reduction can smoothly open the reverse flow valve of the balancing valve 310, thereby making the balancing valve 310 perform a reverse action. At this time, the piston rod retracts under the pressure of the hydraulic oil, driving the construction platform 900 to descend smoothly.

[0081] In one possible implementation, please refer to Figure 6 The electrically controlled lifting module 300 further includes a reversing valve 350, which is connected to the hydraulic cylinder 100 via the balancing valve 310; the reversing valve 350 is used to control the construction platform 900 to be in a lifting state or a lowering state under the control of the control module.

[0082] In this embodiment, the electric control lifting module 300 further includes a reversing valve 350, which can change the flow direction of the fluid in the second oil pipe 320 and the third oil pipe 330 under the control of the control module. For example, when the construction platform 900 needs to be lifted, the reversing valve 350 controls the oil tank to provide high-pressure hydraulic oil to the rodless chamber 120 through the high-pressure oil pump, and at the same time, the hydraulic oil in the rod chamber 110 is released to the oil tank through the third oil pipe 330. When the construction platform 900 needs to be lowered, the opposite is true.

[0083] The present application also provides a hydraulic control method 20, please refer to Figure 7 , applied to any one of the above hydraulic control systems 10, comprising:

[0084] Step S100: setting the diameter of the throttle hole in the throttle valve.

[0085] In the existing oil circuit system, once the rodless chamber 120 of the hydraulic cylinder 100 bursts, the balance valve 310 will not be able to provide the necessary support force for the hydraulic cylinder 100, causing the hydraulic cylinder 100 to retract quickly, and the construction platform 900 will stall and descend. This step can accurately control the amount of hydraulic oil flowing through by setting the diameter of the throttle hole in the throttle valve, thereby controlling the lowering speed of the construction platform 900, and effectively avoiding the risk of the mechanism stalling and lowering. For example, when a pipe bursts, the explosion-proof valve is automatically locked first to prevent the stalling and lowering of the construction platform 900 at the moment of the pipe burst and the subsequent stalling, and at the same time, according to the diameter of the throttle hole in the throttle valve set in this step, the hydraulic oil in the rodless chamber 120 flows out at a uniform speed through the throttle valve. According to the specific speed requirements for the safe lowering of the construction platform 900, the operator can adjust the diameter of the throttle hole in the throttle valve before the operation to achieve accurate control of the lowering speed.

[0086] Step S200 : controlling the manual pump 520 to deliver fluid to the control end of the logic valve 510 by manual pressurization to open or close the logic valve 510 .

[0087] In this embodiment, after ensuring that the operator is in a safe position, operate the manual pump 520 to release an appropriate amount of hydraulic oil. The maximum pressure released by the manual pump 520 is strictly regulated by the pressure relief valve 540 to prevent excessive pressure from damaging the system. As the manual pump 520 operates, the hydraulic oil is pushed to the logic valve 510. When the logic valve 510 is switched to the left position, the hydraulic oil in the rodless chamber 120 of the hydraulic cylinder 100 begins to flow out through the first throttle valve 210, the logic valve 510 and the third throttle valve 530 in sequence, and the construction platform 900 is slowly lowered at the speed controlled by the throttle valve; at the same time, the explosion-proof valve will be automatically locked to bear the weight of the entire construction platform 900.

[0088] The embodiment of the present application further provides a charging trolley 30 , comprising a construction platform 900 and any one of the above-mentioned hydraulic control systems 10 , wherein the hydraulic control system 10 can control the descent of the construction platform 900 through the above-mentioned hydraulic control method 20 .

[0089] Please refer to Figure 8 To facilitate those skilled in the art to understand the solution provided by this embodiment, an example is further described below. It is worth noting that the charging trolley 30 includes a scissor-type lifting mechanism 910, and the hydraulic cylinder 100 controls the lifting of the construction platform by controlling the lifting of the scissor-type lifting mechanism 910.

[0090] The construction environment inside the tunnel is harsh, with high dust concentration and high humidity, which significantly increases the failure rate of the charging trolley 30 when operating in the tunnel. For example, when the charging trolley 30 is subjected to additional impact or the hose is damaged, the hydraulic cylinder 100 that supports the lock is very likely to burst: once a single hydraulic cylinder 100 bursts, the platform will be overloaded, and the hydraulic cylinder 100 that has not burst will not be able to be lowered normally; if two hydraulic cylinders 100 burst at the same time, the support lock will fail, and the mechanism will fall rapidly, posing a great safety threat to the operator.

[0091] In addition, in the event of an electrical system failure or a problem with the pressure control system, the trolley operating platform must be lowered urgently to ensure safe evacuation of personnel. To prevent safety accidents caused by high center of gravity movement in the deployed state, the charging trolley 30 can only be moved after it is lowered and retracted.

[0092] Therefore, in this embodiment, a remotely controllable explosion-proof pipe design is proposed to effectively solve the above-mentioned safety hazards and ensure the safety and efficiency of the construction process.

[0093] In the event of a failure in the electrical system of the charging trolley 30, the hydraulic control system 10 will not be able to achieve safe lowering of the construction platform 900 through the conventional control module. At this time, the emergency manual lowering module 500 and the protection module 200 must be activated to ensure operational safety. For example:

[0094] First, according to the specific speed requirement for safely lowering the construction platform 900, the diameter of the throttle hole in the throttle valve is adjusted to accurately control the flow of the fluid, ie, the hydraulic oil.

[0095] Next, the operator confirms that the manual pump 520 is in standby mode and ensures that all connecting pipes and valves are in the correct position for manual operation. The operator delivers hydraulic oil to the control end of the logic valve 510 by rotating or pressing the handle of the manual pump 520. This step requires precise control to avoid excessive pressure from damaging the system. As the manual pump 520 is pressurized, the hydraulic oil is delivered to the control end of the logic valve 510. When the preset pressure threshold is reached, the logic valve 510 will automatically switch to the working position, so that the hydraulic oil flows out of the rodless chamber 120 of the hydraulic cylinder 100, thereby pushing the hydraulic cylinder 100 to retract in the direction D1, so that the scissor lift mechanism 910 can be smoothly lowered in the direction D2; at the same time, the explosion-proof valve will automatically lock and temporarily bear the weight of the entire construction platform 900.

[0096] If the lowering process needs to be stopped or paused, the operator can stop the pressurization operation of the manual pump 520. As the pressure at the control end decreases, the logic valve 510 will return to the initial position, cutting off the flow of hydraulic oil, thereby stopping the retraction of the hydraulic cylinder 100 and the lowering of the construction platform 900.

[0097] During the entire manual operation process, the operator needs to continuously monitor the pressure gauge to ensure that the system pressure is always within the safe range to avoid system damage or safety accidents caused by excessive pressure. In order to further improve the safety of the operation, the manual pump 520 system is equipped with a pressure relief valve 540 to prevent the pressure from exceeding the safety limit. The pressure relief valve 540 can release excess pressure to protect the safety of the operator and equipment. Through the above embodiments, even if the automatic control system fails, the safe lowering of the construction platform 900 can be ensured.

[0098] In addition, the control of the lowering speed is achieved through the dual adjustment of the first throttle valve 210 and the third throttle valve 530. This double-layer control mechanism ensures the stability and safety of the lowering process of the construction platform 900. Through the above structure and operation process, even if the electrical system and the pressure control system fail, the safety of the construction personnel can be effectively guaranteed, and the lowering operation of the construction platform 900 can be successfully completed.

[0099] In summary, the present application provides a hydraulic control system 10, a hydraulic control method 20 and a charging trolley 30, including a hydraulic cylinder 100, a protection module 200, a control module, an electric control lifting module 300, a first oil pipe 410 and a manual lowering module 500; the hydraulic cylinder 100 includes a rod chamber 110 and a rodless chamber 120; the electric control lifting module 300 is respectively connected to the rod chamber 110 and the rodless chamber 120 of the hydraulic cylinder 100, and is used to respectively supply oil to the rod chamber 110 and the rodless chamber 120 under the control of the control module. The manual descending module 500 includes a manual pump 520 connected to the control end of the logic valve 510, and the manual pump 520 is used to deliver fluid to the logic valve 510 by manual pressure to open or close the logic valve 510; the protection module 200 includes a throttle valve, and the aperture of the throttle valve is adjustable; the logic valve 510 is arranged on the first oil pipe 410, and the first oil pipe 410 is connected to the rodless chamber 120 through the throttle valve. When the logic valve 510 is opened, the fluid in the rodless chamber 120 is released through the throttle valve and the first oil pipe 410. The present application solves the problem that the construction platform 900 stalls when a pipe bursts or the construction platform 900 cannot be lowered under abnormal working conditions by setting the protection module 200 and the manual descending module 500.

[0100] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0101] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A hydraulic control system, characterized in that: The construction platform used for the charging trolley includes a hydraulic cylinder, a protection module, a control module, an electric control lifting module, a first oil pipe and a manual lowering module; The hydraulic cylinder includes a rod chamber and a rodless chamber; The electric-controlled lifting module is respectively connected to the rod chamber and the rodless chamber of the hydraulic cylinder, and the electric-controlled lifting module is used to input or output fluid to the rod chamber and the rodless chamber respectively under the control of the control module; The manual lowering module comprises a manual pump connected to the control end of the logic valve, and the manual pump is used to deliver fluid to the control end of the logic valve by manual pressurization to open or close the logic valve; The protection module includes a first throttle valve having an adjustable aperture; the logic valve is arranged on a first oil pipe, and the first oil pipe is connected to the rodless chamber via the first throttle valve; when the logic valve is opened, the fluid in the rodless chamber is released via the first throttle valve and the first oil pipe.

2. The hydraulic control system according to claim 1, characterized in that: The protection module further includes a first explosion-proof valve, a second explosion-proof valve and a second throttle valve; the hydraulic cylinder includes a first hydraulic cylinder and a second hydraulic cylinder; The rodless chamber is connected to the first oil pipe via the explosion-proof valve, and the explosion-proof valve is used to prevent the fluid in the rodless chamber from flowing into the first oil pipe via the explosion-proof valve when the first oil pipe explodes; The first oil pipe is connected to the rodless chamber of the second hydraulic cylinder via the second throttle valve; when the logic valve is opened, the fluid in the rodless chamber of the second hydraulic cylinder is released via the second throttle valve and the first oil pipe.

3. The hydraulic control system according to claim 1, characterized in that: The manual descent module also includes a third throttle valve. The fluid in the rodless chamber is released sequentially through the first throttle valve, the first oil pipe and the third throttle valve. The third throttle valve is used to further control the flow rate of the fluid in the first oil pipe.

4. The hydraulic control system according to claim 1, characterized in that: The manual descending module further includes a pressure relief valve, which is used to control the pressure of the fluid delivered by the manual pump.

5. The hydraulic control system according to claim 1, characterized in that: The throttle hole diameter of the throttle valve is: Wherein S is the cross-sectional area of ​​the rodless chamber of the hydraulic cylinder, V is the descending speed of the construction platform, C is the flow coefficient, ρ is the fluid density, and Δp is the pressure difference; The pressure difference is: Wherein G is the weight of the construction platform.

6. The hydraulic control system according to claim 1, characterized in that: The electrically controlled lifting module includes a second oil pipe, a third oil pipe and a balancing valve. The second oil pipe is connected to the rodless chamber via the balancing valve, and the third oil pipe is connected to the rod chamber via the balancing valve. The balancing valve is used to provide reverse thrust to the construction platform during its lowering process, so that it can be lowered smoothly.

7. The hydraulic control system according to claim 6, characterized in that: The electric control lifting module also includes a pressure reducing valve, which is connected to the balancing valve and is used to reduce the pressure of the high-pressure fluid in the third oil pipe and allow the reduced-pressure fluid to open a reverse flow valve of the balancing valve.

8. The hydraulic control system according to claim 6, characterized in that: The electric control lifting module further includes a reversing valve, which is connected to the hydraulic cylinder via the balancing valve; The reversing valve is used to control the construction platform to be in a raised state or a lowered state under the control of the control module.

9. A hydraulic control method, characterized in that: The hydraulic control system according to any one of claims 1 to 8 comprises: Setting the diameter of the throttle hole in the throttle valve; The manual pump is controlled to deliver fluid to the control end of the logic valve through manual pressure to open or close the logic valve.

10. A charging trolley, characterized in that: It comprises a construction platform and the hydraulic control system according to any one of claims 1 to 8, wherein the hydraulic control system can control the descent of the construction platform through the hydraulic control method according to claim 9.

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