Hydraulic tensioning system and inhaul cable tensioning system

Abstract

The invention discloses a hydraulic tensioning system and an inhaul cable tensioning system, and the hydraulic tensioning system comprises a tensioning oil cylinder and a main pump; the tensioning oil cylinder comprises a cylinder barrel, a piston assembly and a piston rod locking assembly, the piston assembly comprises a first piston rod end extending out of the first end of the cylinder barrel and a second piston rod end extending out of the second end of the cylinder barrel, the first piston rod end is an inhaul cable connecting end, and the piston rod locking assembly is used for limiting the second piston rod end. A first working cavity of the cylinder barrel is provided with a cylinder barrel oil port, a second working cavity of the cylinder barrel is provided with a reset piece, the main pump is in hydraulic connection with the cylinder barrel oil port, and the output flow of the main pump is adjustable; by means of the tensioning hydraulic system, automatic tensioning of the inhaul cable can be achieved, the hydraulic driving power density is high, the load capacity is high, and the tensioning hydraulic system is particularly suitable for scenes with large tensioning force.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of tower crane equipment, and particularly relates to a hydraulic tensioning system and a cable tensioning system. BACKGROUND

[0002] For a tower building or equipment of steel structure, such as a power tower, a communication signal base station, a tower crane and the like, a pull rod or cable system is usually needed to be added to improve the stability and rigidity of the structure. In order to ensure that the pull rod or cable system reaches the required tension, a tensioning device needs to be used to tension the pull rod system. The existing tensioning device generally adopts a mechanical screw structure for tensioning, and the structure comprises an upper pull rod, a lower pull rod and a nut. The upper pull rod and the lower pull rod are both screw rods and are connected through the nut. By rotating the nut, the relative distance between the upper pull rod and the lower pull rod can be adjusted, so as to realize the relaxation or tensioning of the pull rod system. However, the tensioning force of this tensioning device is borne by the screw thread joint of the screw rod and the nut. With the tensioning process, the torque required for rotating the nut increases with the increase of the friction force on the screw thread contact surface. The manual tensioning is more and more laborious, and the tensioning force increases to a certain value, which cannot be completed by manpower.

[0003] CONTENT OF THE APPLICATION In view of the above defects or deficiencies, the application provides a hydraulic tensioning system and a cable tensioning system, aiming to solve the technical problem that the existing technology needs manual operation and is not suitable for a pull rod system with a large tensioning force.

[0004] To achieve the above-mentioned purpose, the first aspect of the application provides a hydraulic tensioning system, comprising a tensioning oil cylinder and a main pump. The tensioning oil cylinder comprises a cylinder barrel, a piston assembly and a piston rod locking assembly. The piston assembly comprises a first piston rod end extending from a first end of the cylinder barrel and a second piston rod end extending from a second end of the cylinder barrel. The first piston rod end is a cable connecting end. The piston rod locking assembly is used to limit the second piston rod end. A first working cavity of the cylinder barrel is provided with a cylinder barrel oil port, and a second working cavity of the cylinder barrel is provided with a reset member. The main pump is hydraulically connected with the cylinder barrel oil port, and the output flow of the main pump is adjustably set.

[0005] In the embodiment of the application, the main pump comprises a constant displacement pump and a variable frequency motor.

[0006] In the embodiment of the application, the main pump comprises an electrically controlled variable displacement pump and a constant frequency motor.

[0007] In the embodiment of the application, the reset member is a compression spring, and the tensioning hydraulic system further comprises: a pressure sensor for detecting the oil pressure at the cylinder barrel oil port; a piston displacement sensor for detecting the stroke of the first piston rod end; a controller configured to: obtain the pressure detection value of the pressure sensor and the displacement detection value of the piston displacement sensor; determine the tensioning force of the tensioning oil cylinder according to the pressure detection value, the displacement detection value and the tensioning force calculation formula; The tensioning force calculation formula is F=(P×S)- (k×x), F is the tensioning force of the tensioning oil cylinder, P is the pressure detection value of the pressure sensor, S is the effective acting area of the piston rod of the tensioning oil cylinder, k is the spring stiffness coefficient of the compression spring, and x is the displacement detection value of the piston displacement sensor.

[0008] In the embodiment of the application, the controller is further configured to: determine that the tensioning force of the tensioning oil cylinder reaches the preset tensioning value; issue the piston rod fixing signal.

[0009] In the embodiment of the application, the tensioning hydraulic system comprises a plurality of tensioning oil cylinders and a plurality of main pumps in hydraulic connection with the plurality of tensioning oil cylinders one by one, and the controller is configured to: determine that each main pump is in a synchronous working state; acquire the displacement detection values of each piston displacement sensor in real time, and acquire a maximum displacement difference value in real time according to a displacement difference value between any two displacement detection values; determine that the maximum displacement difference value reaches a preset displacement difference value; control the tensioning oil cylinder with the largest piston rod stroke to stop oil supply.

[0010] In the embodiment of the application, the controller is further configured to: determine that the maximum displacement difference value is not greater than a safety displacement difference value; control the tensioning oil cylinder with the largest piston rod stroke to resume oil supply; The safety displacement difference value is less than the preset displacement difference value.

[0011] In the embodiment of the application, the tensioning hydraulic system further comprises: a relief valve in hydraulic connection with a cylinder barrel oil port of the cylinder barrel.

[0012] In the embodiment of the application, the tensioning hydraulic system further comprises: a pressure gauge arranged at a pumping oil port of the main pump.

[0013] To achieve the above object, the second aspect of the application provides a cable tensioning system, which comprises a fixed base, a cable and the above tensioning hydraulic system, the cylinder barrel is hinged to the fixed base, one end of the cable is connected to a tower body, and the other end is connected to the first piston rod end.

[0014] Through the above technical solution, the hydraulic tensioning system provided in the embodiment of the application has the following beneficial effects: When the hydraulic tensioning system is used, the cylinder can be arranged on the fixed base, the first piston rod end is connected with the cable, before the cable is tensioned, the reset member drives the first piston rod end to fully extend, at this time, the cable is in a relaxed state; when the tensioning operation is performed, the main pump is started and hydraulic oil is pumped to the cylinder port, when the pressure of the first working chamber is greater than the pushing force of the reset member, the first piston rod end gradually retracts, and the cable is gradually tensioned; when the cable is in a tensioned state, the second piston rod end is limited by the piston rod locking assembly, at this time, the reaction force of the cable on the first piston rod end is transmitted to the cylinder through the piston rod locking assembly, and the cylinder transmits the force to the fixed base, so that the cable is fixed, and the automatic tensioning of the cable can be realized through the tensioning hydraulic system, and the hydraulic driving power density is high and the load capacity is large, and the tensioning hydraulic system is especially suitable for scenes with large tensioning force.

[0015] Other features and advantages of the present application will be described in detail in the following detailed description section. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, and are used to explain the present application together with the following detailed description, but do not constitute a limitation on the present application. In the drawings: Figure 1 is a hydraulic schematic diagram of a tensioning hydraulic system according to an embodiment of the present application; Figure 2 is a schematic diagram of a tensioning cylinder according to an embodiment of the present application; Figure 3 is a top view of the tensioning cylinder according to an embodiment of the present application; Figure 4 is a schematic diagram of a rotary driving mechanism according to an embodiment of the present application; Figure 5 is a schematic diagram of a cable tensioning system according to an embodiment of the present application; Figure 6 is a control flowchart of a controller according to an embodiment of the present application.

[0017] BRIEF DESCRIPTION OF DRAWINGS DETAILED DESCRIPTION

[0018] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application.

[0019] The hydraulic tensioning system and the cable tensioning system of the present application will be described below with reference to the accompanying drawings.

[0020] As Figure 1 andFigure 2 As shown, the present application provides a hydraulic tensioning system, comprising: The tensioning oil cylinder comprises a cylinder barrel 1, a piston assembly and a piston rod locking assembly 4, the piston assembly comprises a first piston rod end 2 extending from the first end of the cylinder barrel 1 and a second piston rod end 3 extending from the second end of the cylinder barrel 1, the first piston rod end 2 is a cable connecting end, and the piston rod locking assembly 4 is used to limit the second piston rod end 3, the first working cavity of the cylinder barrel 1 is provided with a cylinder oil port 11, and the second working cavity of the cylinder barrel 1 is provided with a reset member 83; The main pump 81 is hydraulically connected with the cylinder oil port 11, and the output flow of the main pump 81 can be adjusted and set.

[0021] The existing device relies on manual screwing of nuts to adjust the distance between the upper and lower pull rods. For scenes with large tensioning force, it is difficult to complete only by relying on human power. In view of this problem, the present application designs a tensioning hydraulic system, which replaces manual operation by a tensioning oil cylinder, and controls the extension and retraction direction of the piston rod of the tensioning oil cylinder by controlling the start and stop of the main pump 81 in cooperation with the reset member 83, without the need to set a reversing valve or other hydraulic elements, so that the structure of the hydraulic tensioning system is simpler. Further, by controlling the output flow of the main pump 81, the extension and retraction speed of the piston rod of the tensioning oil cylinder can also be directly controlled, and the tensioning speed of the cable 7 is adjusted to match different tensioning working conditions. Through the tensioning hydraulic system, hydraulic tensioning of the cable 7 can be realized, and the hydraulic driving power density is high and the load capacity is large, which is especially suitable for scenes with large tensioning force.

[0022] In addition, considering that the tensioning hydraulic system of the present application needs to keep the cable 7 in a tensioned state for a long time after tensioning the cable 7, the tensioning oil cylinder of the present application is provided as a double-piston rod hydraulic cylinder and is configured with a piston rod locking assembly 4, the first piston rod end 2 extends from the first end of the cylinder barrel 1 and is used to connect the cable 7, and the second piston rod end 3 extends from the second end of the cylinder barrel 1. After tensioning the cable 7, the second piston rod end 3 is limited and locked by the piston rod locking assembly 4. At this time, even if the main pump 81 is turned off and the pressure on the piston rod is removed, due to the limiting action of the piston rod locking assembly 4, the entire piston rod still remains in the position that tensions the cable 7. It can be understood that if a single-piston hydraulic cylinder is provided, the piston rod is maintained in the position that tensions the cable 7 only by hydraulic pressure, and the main pump 81 must be kept in a working state for a long time, or a corresponding valve assembly is added to keep the cylinder barrel 1 in a high-pressure closed environment for a long time, which has high requirements for the main pump 81, the valve assembly and the corresponding oil port connection structure. Once hydraulic oil leaks, the tensioning of the cable 7 is instantly invalid, which seriously affects the safety of the tower device or building. In the present application, mechanical locking of the piston rod is realized by the piston rod locking assembly 4 after tensioning is completed, and hydraulic oil does not need to be continuously supplied to the tensioning oil cylinder, which effectively reduces the use cost and improves the safety in the long-term tensioning state.

[0023] Specifically, the working process of the tensioning hydraulic system is as follows: the cylinder 1 is hinged to the fixed base 6, the first piston rod end 2 is connected to the cable 7, before the tensioning operation of the cable 7, the reset member 83 drives the first piston rod end 2 to fully extend, at this time, the cable 7 is in a relaxed state; when the tensioning operation is performed, the main pump 81 is started and pumps hydraulic oil to the cylinder oil port 11, when the pressure of the first working chamber is greater than the pushing force of the reset member 83, the first piston rod end 2 gradually retracts, and the cable 7 is gradually tensioned; after the cable 7 is in a tensioned state, the second piston rod end 3 is limited by the piston rod locking assembly 4, at this time, the reaction force of the cable 7 on the first piston rod end 2 is transmitted to the cylinder 1 through the piston rod locking assembly 4, and the cylinder 1 transmits the force to the fixed base 6 through the pin shaft between the cylinder 1 and the fixed base 6, thereby fixing the cable 7. Therefore, through the tensioning hydraulic system, automatic tensioning of the cable 7 can be realized, and the hydraulic driving power density is high and the load capacity is strong, which is especially suitable for scenes with large tensioning force.

[0024] The main pump 81 is composed of a hydraulic pump and a motor for driving the hydraulic pump to rotate. In order to realize the adjustment of the flow, the combination of the hydraulic pump and the motor has multiple combinations. In an embodiment of the present application, the main pump 81 is set as a combination of a constant displacement pump 811 and a variable frequency motor 812. The constant displacement pump 811 can provide stable flow output, ensuring reliable hydraulic power supply during the working process of the system, and the variable frequency motor 812 can flexibly adjust the speed of the constant displacement pump 811 according to actual needs, thereby realizing accurate control of the output flow of the main pump 81. The variable frequency motor 812 can realize automatic control of the tensioning cylinder in cooperation with the corresponding controller and control program, and can accurately control the oil inlet and oil return of the cylinder oil port 11 according to actual needs, thereby further improving the efficiency and stability of the tensioning operation.

[0025] In addition, in another embodiment of the present application, the main pump 81 can also be set as a combination of an electrically controlled variable displacement pump and a constant frequency motor. The constant frequency motor provides stable power input for the electrically controlled variable displacement pump, ensuring the stability of its operation, and the electrically controlled variable displacement pump can flexibly adjust the inclination angle of the swash plate according to actual needs, thereby realizing accurate control of the output flow of the main pump 81. The electrically controlled variable displacement pump can realize automatic control of the tensioning cylinder in cooperation with the corresponding controller and control program, and can accurately control the oil inlet and oil return of the cylinder oil port 11 according to actual needs, thereby further improving the efficiency and stability of the tensioning operation.

[0026] For the tensioning cylinder, the reset member 83 is generally selected as a compression spring because the inside of the tensioning cylinder is filled with hydraulic oil. The compression spring has stable performance and is not easily affected by the hydraulic oil, and its cost is relatively low.

[0027] Of course, the present application is not limited to this, in other embodiments, the reset member 83 can also be selected as other materials with elastic function, such as elastic silica gel. The hydraulic tensioning system of the present application is generally used for tensioning the cable 7 of large buildings or equipment such as tower cranes, power towers and communication signal base stations. When tensioning, it is necessary to ensure operation efficiency and avoid impact on the tower body caused by too fast tensioning speed. Although the main pump can adjust the flow, the above system cannot directly feedback the tensioning condition of the cable, and can only rely on the experience of the operator to judge, which has low reliability. Therefore, the tensioning hydraulic system of the present application further comprises: A pressure sensor 82 for detecting the oil pressure at the cylinder oil port 11; A piston displacement sensor 86 for detecting the stroke of the first piston rod end 2; A controller configured to: Obtain the pressure detection value of the pressure sensor 82 and the displacement detection value of the piston displacement sensor 86; Determine the tensioning force of the tensioning cylinder according to the pressure detection value, the displacement detection value and the tensioning force calculation formula; Wherein, the tensioning force calculation formula is F= (P x S) - (k x x), F is the tensioning force of the tensioning cylinder, P is the pressure detection value of the pressure sensor 82, S is the effective acting area of the piston rod of the tensioning cylinder, k is the spring stiffness coefficient of the compression spring, and x is the displacement detection value of the piston displacement sensor 86.

[0028] By setting the pressure sensor 82 and the piston displacement sensor 86, the tensioning force of the tensioning cylinder can be calculated in real time, thereby providing accurate data support for stable operation of the system. The controller can flexibly and accurately control the tensioning hydraulic system according to these real-time data to adapt to the changes in the demand for the tensioning force of the cable 7 under different working conditions. Compared with the scheme of setting a tension sensor between the first piston rod end 2 and the cable 7, the present scheme does not need to additionally install a tension sensor in a narrow space, greatly reducing the installation difficulty and space occupation, and reducing the potential fault hidden dangers caused by complex installation. At the same time, the use of the pressure sensor 82 has lower cost and is more convenient to maintain, thereby effectively reducing the cost and maintenance workload of the entire system under the premise of ensuring detection accuracy.

[0029] It can be understood that after tensioning is completed, the piston rod locking assembly 4 needs to be installed in time. The conventional way is to monitor the tensioning force by manual operation and to perform corresponding operation in time. However, this way requires the operator to monitor the tensioning force all the time, which is time-consuming and laborious, and the response is not timely. Therefore, in the embodiment of the present application, the controller is further configured to: Determine that the tensioning force of the tensioning cylinder reaches a preset tensioning value; Send a piston rod fixing signal.

[0030] After the controller sends a signal to fix the piston rod, the variable frequency motor 812 or the electronically controlled variable displacement pump can directly respond to the signal and act. This automated operation can effectively reduce the burden on operators, improve response speed, and ensure that the stability of the tower body is not affected by excessive tension.

[0031] Furthermore, in the embodiments of this application, the piston rod locking assembly 4 can limit the piston rod by manual operation by an operator or by automatic limiting through a corresponding drive mechanism.

[0032] For the manually operated piston rod locking assembly 4, a corresponding indicator light or buzzer can be set. After the controller sends a piston rod fixing signal, the indicator light or buzzer will emit a corresponding light or sound signal to prompt the operator to perform the piston rod fixing operation in a timely manner.

[0033] For the automatically operated piston rod locking assembly 4, after the controller sends a piston rod fixing signal, the system automatically executes the piston rod fixing action, locking the piston rod through a mechanical structure to ensure that the tensioning cylinder maintains a stable tension state.

[0034] For large buildings or equipment such as tower cranes, power towers, and communication signal base stations, the number of cables 7 configured is generally multiple, thereby stabilizing the tower body in multiple directions. Therefore, in this embodiment, the tensioning hydraulic system includes multiple tensioning cylinders and multiple main pumps 81 that are hydraulically connected to each of the multiple tensioning cylinders.

[0035] like Figure 6 As shown, considering that the load on the tensioning cylinder changes dynamically during the tensioning process, and the strokes of each first piston rod end 2 also differ, when the displacement difference is too large, the multiple cables 7 connecting the tower body will experience uneven stress, and the tower body will easily tilt to one side of one of the cables 7. To overcome this problem, the controller is configured as follows: S100, confirm that each main pump 81 is in a synchronous working state; S200 acquires the displacement detection values ​​of each piston displacement sensor 86 in real time, and acquires the maximum displacement difference in real time based on the displacement difference between any two displacement detection values. S300, determine that the maximum displacement difference has reached the preset displacement difference; S400 controls the cessation of oil supply to the tension cylinder where the piston rod stroke is at its maximum.

[0036] Then, through the steps S100 to S400 of the piston rod displacement sensor and the controller, the multiple tensioning oil cylinders in the tensioning hydraulic system can be effectively and accurately controlled. In the case of excessive displacement difference, the oil supply to the tensioning oil cylinder of the first piston rod end 2 with the largest stroke is cut off in time to avoid the tower body tilting. Specifically, the main pump 81 is in a working state, and the main pump 81 pumps hydraulic oil to the cylinder barrel oil port 11. At this time, the first piston rod end 2 is retracted, and the cable 7 is gradually tensioned. When each main pump 81 is in a synchronous working state, the multiple cables 7 connected to the tower body are synchronously tensioned.

[0037] After the step S400 is performed, the maximum displacement difference value decreases, as shown in the following formula: Figure 6 To further improve the automation degree of the tensioning hydraulic system, in the embodiment of the present application, the controller is further configured to, after the step S400: S500, determine whether the maximum displacement difference value is not greater than a safety displacement difference value; S600, control the tensioning oil cylinder with the largest piston rod stroke to resume oil supply; Wherein, the safety displacement difference value is less than the preset displacement difference value.

[0038] Specifically, after the step S400 is performed to cut off the oil supply, the displacement sensor continuously monitors the displacement of each first piston rod end 2, so as to determine the change of the current maximum displacement difference value. In the step S500, the determined maximum displacement difference value is compared with the safety displacement difference value. If the maximum displacement difference value is not greater than the safety displacement difference value, it indicates that the uneven force condition of each cable 7 has been effectively improved, and the risk of tower body tilting is reduced to an acceptable range. Therefore, in the step S600, the controller controls the tensioning oil cylinder with the largest piston rod stroke to resume oil supply, so that the entire tensioning hydraulic system continues to work, each cable 7 is continuously and synchronously tensioned, and the tower body is stably built.

[0039] Specifically, the safety displacement difference value can be set as needed. In an embodiment, the safety displacement difference value is set to 0, that is, when the maximum displacement difference value exceeds the preset displacement difference value, the controller will control each main pump 81 to act one by one until the strokes of the first piston rod ends 2 of all tensioning oil cylinders are the same.

[0040] Specifically, the tensioning hydraulic system further comprises an oil tank, a main pump 86 and a connecting oil line. The oil tank is used to provide hydraulic oil. The input port of the main pump 86 is hydraulically connected to the oil tank. The output port of the main pump 86 is hydraulically connected to the oil inlet of the main valve piece 81. The working oil port of the main valve piece 81 is hydraulically connected to the cylinder barrel oil port of the cylinder barrel 1. The oil return port of the main valve piece 81 is hydraulically connected to the oil tank.

[0041] Further, as mentioned above, by setting corresponding pressure sensors and controllers, the situation of excessive tension can be avoided, and the pressure in the system can be ensured to be within a safe range. However, if the execution element or the pipeline is blocked, the pressure in the system will rapidly increase, and the controller will be difficult to respond quickly, which will cause a safety risk. Therefore, in the embodiment of the present application, the tension hydraulic system further comprises an overflow valve 84, which is hydraulically connected to the cylinder oil port 11 of the cylinder barrel 1. The setting of the overflow valve 84 can effectively prevent the system pressure from being too high. When the pressure at the oil inlet of the main valve exceeds the set pressure of the overflow valve 84, the overflow valve 84 is opened, and part of the oil flows back to the oil tank, thereby ensuring the safe and stable operation of the tension hydraulic system.

[0042] Further, the overflow valve 84 is set as an electric proportional overflow valve. Compared with ordinary overflow valves, the electric proportional overflow valve can accurately control the overflow pressure according to the electric signal, and can realize more accurate adjustment of the system pressure. This makes the tension hydraulic system be able to flexibly and stably maintain a suitable pressure level under different working scenes and load conditions. After the second piston rod end 3 is limited by the piston rod locking assembly 4, the system does not need to maintain a high-pressure hydraulic environment any more, and the controller can control the overflow pressure of the electric proportional overflow valve to be 0, so that the high-pressure oil in the system flows back to the oil tank.

[0043] Further, the tension hydraulic system further comprises a pressure gauge 85, which is arranged at the pumping oil port of the main pump 81. The pressure gauge 85 allows the operator to intuitively understand the internal pressure of the tension hydraulic system, so as to timely find out whether the system has an abnormal pressure condition. When the pressure is too high, it may mean that there is a blockage or other faults in the system. The operator can quickly take corresponding measures such as checking the pipeline and troubleshooting the valve according to the display of the pressure gauge 85, so as to avoid damage to the system components caused by the excessive pressure. When the pressure is too low, it may be caused by oil pump failure, oil leakage, etc. The operator can timely repair or supplement the oil according to the feedback of the pressure gauge 85. In addition, by observing the value change of the pressure gauge 85 for a long time, the overall running condition of the tension hydraulic system can be evaluated and predicted, and preventive maintenance can be performed in advance, thereby further ensuring the stable operation of the system.

[0044] Further, the tension hydraulic system is further provided with an oil suction filter, which is installed on the connecting oil line between the oil tank. The oil suction filter is used to filter impurities in the oil, to ensure the normal operation of the elements in the system, to avoid impurities causing wear or blockage of the oil cylinder, valve and the like, and to effectively prolong the service life of the components.

[0045] Further, the tensioning hydraulic system is also equipped with a temperature sensor arranged in the oil tank, which can monitor the oil temperature in real time. When the oil temperature is too high, the temperature sensor will transmit a signal to the controller, which will immediately control the cooling device to start and cool the oil, ensuring that the system works stably within the appropriate oil temperature range. Because the oil temperature is too high, it will affect the viscosity of the oil, and then affect the stability of the pressure and flow of the system.

[0046] Further, the tensioning hydraulic system is also equipped with a liquid level sensor for real-time monitoring of the liquid level of the oil in the oil tank. Once the liquid level is too low, the liquid level sensor will send an alarm signal to remind the staff to replenish the oil in time to prevent system failure due to insufficient oil.

[0047] Further, the oil tank of the tensioning hydraulic system is also provided with an air filter. When the oil volume decreases or the temperature changes cause the pressure in the oil tank to change, air enters and exits the oil tank through the air filter, which filters dust, particles and other pollutants in the air during this process.

[0048] Further, the tensioning hydraulic system is also provided with an oil return filter, which is arranged on the oil return bus connected to the oil circuit. The oil return bus is provided with an oil return branch line for connecting the overflow valve 84 and the cylinder barrel 1.

[0049] In the embodiment of the present application, the second piston rod end 3 is a threaded connection end, and the piston rod locking assembly 4 includes a tensioning nut 41 which is threadedly connected with the second piston rod end 3 and abuts against the end face of the cylinder barrel 1. The second piston rod end 3 is formed with external threads, and the position of the tensioning nut 41 on the second piston rod end 3 can be adjusted steplessly by screwing the tensioning nut 41. After the cable 7 is tensioned, the tensioning nut 41 can be screwed to abut against the second end of the cylinder barrel 1, and the reaction force of the cable 7 on the first piston rod end 2 is transmitted to the tensioning nut 41 through the threads, and the tensioning nut 41 acts on the second end of the cylinder barrel 1, and the force is transmitted to the fixed base 6 by the cylinder barrel 1, thereby realizing the fixation of the cable 7.

[0050] Of course, the present application is not limited thereto, and the second piston rod segment can also be provided as a lock hole end, i.e. a plurality of lock holes are formed in the second piston rod end 3 for the pins to pass through, and the piston rod locking assembly 4 can be provided as a pin. After the cable 7 is tensioned, the pin can be passed into the corresponding lock hole to make the pin abut against the second end of the cylinder barrel 1, and the reaction force of the cable 7 on the first piston rod end 2 is transmitted to the cylinder barrel 1 through the pin, and the cylinder barrel 1 transmits the force to the fixed base 6, thereby realizing the fixation of the cable 7.

[0051] As Figure 2As shown in this embodiment, the piston rod locking assembly 4 further includes a spacer 42, which is fitted between the cylinder 1 and the tension nut 41. The tension nut 41 is used to abut the spacer 42 against the end face of the cylinder 1. The spacer 42 reduces the length of the external thread section on the second piston rod end 3. It is understood that without the spacer 42, the external thread section needs to extend to the second end of the cylinder 1, while with the spacer 42, the external thread section only needs to extend to the position of the spacer 42. This reduces the processing difficulty and cost of the second piston rod end 3. Furthermore, the presence of the spacer 42 increases the contact area between the tension nut 41 and the cylinder 1, making the force transmission more uniform and effectively preventing deformation or damage to the end face of the cylinder 1 due to excessive local force. In addition, the spacer 42 also provides a certain buffering effect. When the cable 7 vibrates or is impacted during operation, the spacer 42 absorbs some energy, further protecting the cylinder 1 and the tension nut 41 and extending the service life of the entire tensioning device. Furthermore, to facilitate the installation and removal of the spacer 42, an anti-slip texture or a handle structure can be provided on the outer surface of the spacer 42 to improve the convenience and efficiency of operation. like Figure 3 As shown in this embodiment, the spacer 42 is sleeve-shaped and includes stop portions at both ends and a central cylindrical section. The outer diameter of the stop portions is larger than the outer diameter of the cylindrical section. The design of the stop portions effectively restricts the axial movement of the spacer 42 within the cylinder 1, ensuring its stability during operation. The larger outer diameter of the stop portions results in a larger contact area with the inner wall of the cylinder 1, further enhancing the uniformity of force transmission. When the tension nut 41 is tightened, the stop portions can better distribute pressure, preventing wear or deformation of the inner wall of the cylinder 1 due to localized pressure concentration. In this embodiment, multiple spacers 42 are used. It is understood that in actual use, the length of the cable 7 and the installation position of the cylinder 1 will cause differences in the piston rod stroke. By setting multiple spacers 42, they can be flexibly combined according to specific needs to adapt to different piston rod stroke requirements. Using different numbers of spacers 42 allows for precise adjustment of the overall length of the tensioning device, thereby meeting the tensioning requirements of the cable 7 under different working conditions. For example, when the cable 7 is long and requires a larger tension stroke, the number of spacers 42 can be increased; conversely, when the cable 7 is short and requires a smaller tension stroke, the number of spacers 42 can be appropriately reduced. Furthermore, the multiple spacers 42 also facilitate maintenance and replacement. If one of the spacers 42 is worn or damaged, only that spacer 42 needs to be replaced individually, without requiring large-scale disassembly and replacement of the entire tensioning device, reducing maintenance and time costs. like Figure 2 and Figure 3As shown in this embodiment, the piston rod locking assembly 4 further includes an anti-loosening nut 43, which is threadedly connected to the second piston rod end 3 and located on the side of the tensioning nut 41 facing away from the cylinder 1. The anti-loosening nut 43 further enhances the stability of the tensioning device. It is understood that during equipment operation, the tensioning nut 41 may loosen due to factors such as vibration, leading to changes in tension force and affecting the normal operation of the tensioning cylinder. The anti-loosening nut 43 can effectively resist the loosening tendency caused by vibration, prevent the tensioning nut 41 from moving, keep the tensioning nut 41 in a tightened state, and maintain a stable tension force on the cable 7.

[0052] like Figure 4 As shown in this embodiment, the tensioning cylinder further includes a rotary drive mechanism 5 mounted on the cylinder barrel 1. The rotary drive mechanism 5 drives the tensioning nut 41 to move helically along the end 3 of the second piston rod. The rotary drive mechanism 5 further improves the ease of use of the tensioning cylinder. The rotary drive mechanism 5 can quickly and accurately adjust the position of the tensioning nut 41 through an automated driving method. Compared with manual adjustment, this not only improves work efficiency but also allows for precise adjustment of the preload of the tensioning nut 41.

[0053] Specifically, the rotary drive mechanism 5 has a preload detection module, which measures the preload of the tension nut 41 and sends a nut positioning signal when the preload reaches a preset value. The controller is communicatively connected to the rotary drive mechanism 5 and is configured as follows: Send a piston rod fixing signal to the rotary drive mechanism 5; Upon receiving the nut positioning signal, a stop signal is sent to the rotary drive mechanism 5, and the main pump 81 is controlled to stop oil supply, and the overflow valve 84 is controlled to adjust the overflow pressure to 0.

[0054] Understandably, when the rotary drive mechanism 5 receives the piston rod fixing signal, it drives the tension nut 41 to move along the second piston rod end 3. When it receives the stop signal, it disconnects the drive, the main pump 81 stops supplying oil, and the excess hydraulic oil returns to the oil tank through the overflow oil circuit where the overflow valve 84 is located after the overflow pressure is adjusted to 0 by the overflow valve 84.

[0055] Specifically, the rotary drive mechanism 5 includes a first motor 51 and a first drive gear 53 disposed on the output shaft of the first motor 51. A tension gear part 411 is correspondingly disposed on the outer peripheral wall of the tension nut 41. The first drive gear 53 meshes with the tension gear part 411. The first motor 51 drives the first drive gear 53 to rotate, thereby driving the tension gear part 411 meshing with it to rotate, so as to realize the spiral movement of the tension nut 41 along the end of the second piston rod 3.

[0056] Furthermore, the first motor 51 is mounted on the cylinder 1 and tilts and swings synchronously with the cylinder 1. Because the first motor 51 moves synchronously with the cylinder 1, the first drive gear 53 and the tension gear part 411 are always in a meshing state, ensuring the reliability of the gear transmission.

[0057] Furthermore, the preload detection module can be configured to detect the output torque or output power of the first motor 51, obtain the tightening torque of the tension nut 41 through the calculation formula of gear transmission, and then obtain the expected force of the tension nut 41 according to the calculation formula of bolt preload and bolt tightening torque.

[0058] Of course, this application is not limited to this. Alternatively, the second piston rod end 3 can be configured as a rotatable lead screw, and a slide rail parallel to the second piston rod end 3 can be provided on the cylinder. The inner wall of the tension nut 41 is threadedly connected to the second piston rod end 3, and the outer wall of the tension nut 41 is slidably connected to the slide rail. That is, the tension nut 41 and the second piston rod end 3 form a ball screw pair, and the rotary drive mechanism 5 is configured as a motor to drive the second piston rod end 3 to rotate. Specifically, the piston rod of the tensioning cylinder includes a rod body, and the second piston rod end 3 is rotatably connected to the rod body. The connection method can be that an annular groove is opened at the end of the rod body, and the second piston rod end 3 forms a sliding part embedded in the annular groove, thereby achieving a rotatable connection.

[0059] Furthermore, the rotary drive mechanism 5 also includes a second motor 52 and a second drive gear 54 disposed on the output shaft of the second motor 52. A corresponding anti-loosening gear portion 431 is disposed on the outer peripheral wall of the anti-loosening nut 43. The second drive gear 54 meshes with the anti-loosening gear portion 431. The second motor 52 drives the second drive gear 54 to rotate, thereby driving the meshing anti-loosening gear portion 431 to rotate, realizing the helical movement of the anti-loosening nut 43 along the end 3 of the second piston rod. Even further, the second motor 52 is mounted on the hydraulic cylinder and tilts and swings synchronously with the cylinder 1.

[0060] like Figure 3 As shown in this embodiment, the first piston rod end 2 is provided with a plurality of parallel and spaced cable connection grooves 21 and cable connection pin holes 22 passing through the plurality of cable connection grooves 21. The cable 7 connection pin can pass through the cable connection pin hole 22 to firmly fix the cable 7 in the cable connection groove 21, ensuring the stability of the connection between the cable 7 and the tensioning cylinder and preventing the cable 7 from falling off or shifting during the tensioning process.

[0061] like Figure 5As shown, in order to achieve the above-mentioned purpose, the second aspect of the present application provides a cable tensioning system, which comprises a fixed base 6, a cable 7 and the above-mentioned tensioning hydraulic system. The cylinder 1 is hinged on the base, one end of the cable 7 is connected to the tower body, and the other end is connected to the first piston rod end 2. Since the cable tensioning system adopts all the technical solutions of the above-mentioned embodiments, it at least has the above-mentioned beneficial effects, which will not be described one by one here.

[0062] In the description of the present application, it should be understood that the terms "first", "second" are only used for descriptive purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0063] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and other terms should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or communicate with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0064] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of different embodiments or examples without contradiction.

[0065] Although the embodiments of the present application have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the present application. Those skilled in the art can make changes, modifications, replacements and variations to the above-mentioned embodiments within the scope of the present application.

Claims

1. A tensioning hydraulic system, characterized in that, The tensioning hydraulic system includes: The tensioning cylinder includes a cylinder (1), a piston assembly and a piston rod locking assembly (4). The piston assembly includes a first piston rod end (2) extending from a first end of the cylinder (1) and a second piston rod end (3) extending from a second end of the cylinder (1). The first piston rod end (2) is a cable connection end. The piston rod locking assembly (4) is used to limit the second piston rod end (3). The first working chamber of the cylinder (1) is provided with a cylinder oil port (11), and the second working chamber of the cylinder (1) is provided with a reset member (83). The main pump (81) is hydraulically connected to the cylinder oil port (11), and the output flow of the main pump (81) is adjustable.

2. The tensioning hydraulic system according to claim 1, characterized in that, The main pump (81) includes a fixed displacement pump (811) and a variable frequency motor (812).

3. The tensioning hydraulic system according to claim 1, characterized in that, The main pump (81) includes an electrically controlled variable displacement pump and a constant frequency motor.

4. The tensioning hydraulic system according to claim 2 or 3, characterized in that, The reset element (83) is a compression spring, and the tensioning hydraulic system further includes: Pressure sensor (82) is used to detect the oil pressure at the cylinder oil port (11); A piston displacement sensor (86) is used to detect the stroke of the first piston rod end (2); The controller is configured as follows: Obtain the pressure detection value of the pressure sensor (82) and the displacement detection value of the piston displacement sensor (86); The tensioning force of the tensioning cylinder is determined based on the pressure detection value, the displacement detection value, and the tensioning force calculation formula. Wherein, the tension force is calculated as F=(P×S)-(k×x), where F is the tension force of the tensioning cylinder, P is the pressure detection value of the pressure sensor (82), S is the effective working area of ​​the piston rod of the tensioning cylinder, k is the spring stiffness coefficient of the compression spring, and x is the displacement detection value of the piston displacement sensor (86).

5. The tensioning hydraulic system according to claim 4, characterized in that, The controller is also configured to: Determine that the tensioning force of the tensioning cylinder reaches the preset tension value; Send a signal to fix the piston rod.

6. The tensioning hydraulic system according to claim 4, characterized in that, The tensioning hydraulic system includes multiple tensioning cylinders and multiple main pumps (81) hydraulically connected to each of the multiple tensioning cylinders in a one-to-one manner. The controller is configured to: Ensure that all the main pumps (81) are in a synchronous working state; The displacement detection values ​​of each piston displacement sensor (86) are acquired in real time, and the maximum displacement difference is acquired in real time based on the displacement difference between any two displacement detection values. Determine that the maximum displacement difference reaches the preset displacement difference value; The oil supply to the tensioning cylinder, which has the maximum piston rod stroke, is stopped.

7. The tensioning hydraulic system according to claim 6, characterized in that, The controller is also configured to: It is determined that the maximum displacement difference is not greater than the safe displacement difference; The tensioning cylinder, which controls the piston rod to its maximum stroke, resumes oil supply. Wherein, the safe displacement difference is less than the preset displacement difference.

8. The tensioning hydraulic system according to claim 1, characterized in that, The tensioning hydraulic system also includes: The overflow valve (84) is hydraulically connected to the cylinder oil port (11) of the cylinder (1).

9. The tensioning hydraulic system according to claim 1, characterized in that, The tensioning hydraulic system also includes: A pressure gauge (85) is installed at the pumping port of the main pump (81).

10. A cable tensioning system, characterized in that, The cable tensioning system includes a fixed base (6), a cable (7), and a tensioning hydraulic system according to any one of claims 1-9. The cylinder (1) is hinged to the fixed base (6), and one end of the cable (7) is connected to the tower body and the other end is connected to the first piston rod end (2).

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