Telescopic arm hydraulic pipe pre-tightening monitoring device and method of use thereof, engineering vehicle

Abstract

The present application belongs to the technical field of engineering machinery and provides a telescopic arm hydraulic pipe pretightening monitoring device, a maintenance method thereof and a telescopic arm. The device comprises a pulley mounting seat, a tensioning mechanism, a monitoring mechanism and an electric control unit. The pulley mounting seat is provided with a sliding groove extending in a first direction. The tensioning mechanism comprises an entry rope pulley slidingly installed in the sliding groove and a tensioning assembly for pulling the entry rope pulley to move in the sliding groove. The entry rope pulley is used for turning and winding the entry rope section of the hydraulic pipe. The monitoring mechanism is used for monitoring the entry angle of the entry rope section relative to the entry rope pulley. The electric control unit is in communication connection with the monitoring mechanism and is configured to generate a slack alarm signal when the change amount of the entry angle of the entry rope section relative to the entry rope pulley is greater than a preset value. The telescopic arm hydraulic pipe pretightening monitoring device has the functions of detection and tightness adjustment, can realize the state monitoring and secondary tensioning of the hydraulic pipe without disassembling the arm, greatly simplifies the maintenance process of the hydraulic pipe and reduces the maintenance cost.

Description

Technical Field

[0001] This invention belongs to the field of engineering machinery technology, specifically relating to a telescopic boom hydraulic pipe pre-tensioning monitoring device and its usage method, and engineering vehicles. Background Technology

[0002] Telescopic booms typically require hydraulic lines to supply oil to the hydraulic equipment at the boom's front end. Depending on the arrangement of the hydraulic lines, they can be categorized into externally mounted and internally mounted telescopic booms. For internally mounted booms, multiple pulleys are usually installed inside the boom. Hydraulic lines pass through the boom sequentially and are wound around the pulleys, allowing for synchronized extension and retraction of the hydraulic lines and the boom. To prevent the hydraulic lines from detaching from the pulleys, a pre-tension is usually applied during installation. Currently, hydraulic lines are commonly made of rubber. Rubber hydraulic lines inevitably deform and protrude after a period of use, leading to loosening. Because the internal structure of internally mounted telescopic booms is relatively compact, and considering the synchronous movement of the hydraulic lines with the boom's extension and retraction, current technology makes it difficult to monitor the condition of the hydraulic lines in real time. To ensure the safe use of the hydraulic lines, the only option is to manually disassemble and periodically inspect the boom to check and maintain them. However, this maintenance method is not only cumbersome but also costly. Summary of the Invention

[0003] To address the aforementioned defects or deficiencies, this invention provides a telescopic boom hydraulic pipe pre-tensioning monitoring device, a method for using the telescopic boom hydraulic pipe pre-tensioning monitoring device, and an engineering vehicle. The aim is to solve the technical problem that existing telescopic boom hydraulic pipes can only have their status checked by disassembling the boom and undergo secondary tightening, leading to cumbersome maintenance and high maintenance costs.

[0004] To achieve the above objectives, the present invention provides a telescopic boom hydraulic pipe pretension monitoring device, wherein the telescopic boom hydraulic pipe pretension monitoring device includes a pulley mounting base, a tensioning mechanism, a monitoring mechanism, and an electronic control unit. The pulley mounting base is used to be installed on the outer side of the peripheral wall of the telescopic boom's base frame and is provided with a groove extending along a first direction. The tensioning mechanism includes an input rope pulley slidably installed in the groove and a tensioning component for pulling the input rope pulley to move within the groove. The input rope pulley is used for the input rope segment of the hydraulic pipe to turn and wind. The monitoring mechanism is used to monitor the cutting angle of the input rope segment relative to the input rope pulley. The electronic control unit is communicatively connected to the monitoring mechanism and is configured to generate a slack alarm signal when the change in the cutting angle of the input rope segment relative to the input rope pulley is greater than a preset value.

[0005] In an embodiment of the present invention, one end of the rope entry section is wound around the rope entry pulley, and the other end is fixedly connected to the base boom. The monitoring mechanism includes a sensor plate assembly and a sensor unit. One end of the sensor plate assembly is rotatably connected to the outer side of the peripheral wall of the base boom, and the other end is rotatably connected to the peripheral wall of the rope entry section. The sensor unit is used to monitor the tilt angle of the sensor plate assembly. The electronic control unit is communicatively connected to the sensor unit and is configured to generate a slack alarm signal when the change in the tilt angle of the sensor plate assembly is greater than a preset value.

[0006] In an embodiment of the present invention, the sensing plate assembly is provided with a sensing hole, and the monitoring mechanism further includes an adjustable mounting base for height-adjustable installation on the outer side of the peripheral wall of the base boom. The sensing unit is disposed on the adjustable mounting base and the sensing end is disposed toward the sensing plate assembly along a first direction. By rotating the sensing plate assembly, the sensing unit can be aligned with the sensing hole in the first direction. The electronic control unit is configured to issue a slack alarm signal when the sensing end of the sensing unit is aligned with the sensing hole, or the electronic control unit is configured to issue a slack alarm signal when the sensing end of the sensing unit is misaligned with the sensing hole.

[0007] In an embodiment of the present invention, the sensing plate assembly includes a plate body and a buffer spring. The plate body is provided with a first connecting end and a second connecting end. The sensing hole is disposed between the first connecting end and the second connecting end. The first connecting end is used to rotatably connect with the outer side of the peripheral wall of the base boom. The second connecting end is hooked to the outer peripheral wall of the rope entry section by the buffer spring.

[0008] In an embodiment of the present invention, the sensing hole is a strip-shaped slot, with the two sides of the sensing hole facing the first connecting end and the second connecting end, respectively.

[0009] In an embodiment of the present invention, the chute is a waist-shaped groove, the rope pulley is rotatably mounted on the chute via a pin and can slide along the chute, and the tensioning assembly is connected to the pin and used to pull the pin to move within the chute.

[0010] In an embodiment of the present invention, the tensioning assembly includes a tensioning seat, a tensioning screw extending through the tensioning seat along a first direction and with one end extending toward the pulley mounting seat, an adjusting nut screwed onto the tensioning screw and abutting against the tensioning seat, and a connector for connecting the tensioning screw and the pin. By rotating the adjusting nut, the tensioning screw can pull the pin along the first direction.

[0011] In an embodiment of the present invention, the tensioning screw includes a threaded rod portion and a connecting portion. The threaded rod portion is provided with external threads, and the connecting portion is provided with a first connecting hole. The connector includes a first mounting end and a second mounting end. The first mounting end is provided with a first pin hole for mating with the first connecting hole, and the second mounting end is provided with a second pin hole for connecting with a pin shaft.

[0012] In an embodiment of the present invention, the monitoring mechanism further includes a tension sensor, which is disposed between the tension screw and the connector and is used to monitor the tension of the tension screw on the rope pulley. The electronic control unit is configured to issue a pre-tensioning termination signal when the tension of the tension screw on the rope pulley is greater than a preset value.

[0013] To achieve the above objectives, the present invention also provides an engineering vehicle, wherein the engineering vehicle includes a telescopic boom and a telescopic boom hydraulic pipe pre-tensioning monitoring device according to the above description, the telescopic boom hydraulic pipe pre-tensioning monitoring device being installed on the telescopic boom and used to monitor the tightness of the hydraulic pipes inside the telescopic boom.

[0014] In an embodiment of the present invention, the telescopic boom includes a base boom, a multi-section telescopic boom sleeved within the base boom, and a hydraulic pipe passing through the telescopic boom. The pulley mounting seat is installed on the outer side of the peripheral wall of the base boom and its first direction coincides with the length direction of the base boom. The tensioning assembly can pull the rope pulley along the length direction.

[0015] To achieve the above objectives, the present invention also provides a method for using the telescopic boom hydraulic pipe pre-tension monitoring device, wherein the method for using the telescopic boom hydraulic pipe pre-tension monitoring device includes:

[0016] S100: Provides the above-mentioned telescopic boom hydraulic pipe pre-tension monitoring device, and allows the rope entry section of the telescopic boom hydraulic pipe to be turned and wound on the rope entry pulley;

[0017] S200: The tensioning mechanism pulls the rope entry pulley along the length direction to tighten the hydraulic pipe until the preload of the hydraulic pipe reaches the preset value. Then, the installation position of the monitoring mechanism is adjusted to monitor the cutting angle of the rope entry section relative to the rope entry pulley.

[0018] S300: After the telescopic boom has been used for a period of time, if the electronic control unit issues a slack alarm signal, the rope pulley will be pulled again through the tensioning mechanism to make the pre-tension of the hydraulic pipe reach the preset value again, and the installation position of the monitoring mechanism will be readjusted.

[0019] Through the above technical solution, the telescopic boom hydraulic pipe pre-tensioning monitoring device provided in this embodiment of the invention has the following beneficial effects:

[0020] Before using the telescopic boom hydraulic pipe pre-tensioning monitoring device of this invention, it is necessary to ensure that the device and the telescopic boom are correctly installed. Correct installation means installing the pulley mounting base on the outer side of the base boom's perimeter wall, with the first direction parallel to the length direction of the base boom. Simultaneously, the head end of the hydraulic pipe should be wound around the rope entry pulley to form a rope entry segment. After the rope entry segment is wound around the rope entry pulley, a cutting angle is formed between them. The cutting angle will differ depending on the slack state of the rope entry segment. The monitoring mechanism monitors the cutting angle of the rope entry segment relative to the rope entry pulley in real time, thereby enabling real-time monitoring of the hydraulic pipe's tension. When the hydraulic pipe becomes slack and droops, simply pulling the rope entry pulley along the length direction of the base boom using the tensioning mechanism will re-tighten the hydraulic pipe. In summary, this invention, by installing a telescopic boom hydraulic pipe pre-tensioning monitoring device on the telescopic boom, can achieve hydraulic pipe status monitoring and secondary tensioning without disassembling the boom, thus greatly simplifying the hydraulic pipe maintenance process and reducing maintenance costs.

[0021] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0022] The accompanying drawings are provided to illustrate the invention and form part of the specification. They are used together with the following detailed description to explain the invention, but do not constitute a limitation thereof. In the drawings:

[0023] Figure 1 This is a partial schematic diagram of a telescopic arm equipped with a telescopic arm hydraulic pipe pre-tensioning monitoring device according to an embodiment of the present invention.

[0024] Figure 2 According to the embodiments of the present invention Figure 1 Enlarged structural diagram at point A;

[0025] Figure 3 This is a schematic diagram of the structure of the sensor panel assembly according to an embodiment of the present invention;

[0026] Figure 4 This is a partial structural schematic diagram of the telescopic boom hydraulic pipe pre-tightening monitoring device according to an embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of the specific structure of the tensioning screw according to an embodiment of the present invention;

[0028] Figure 6 This is a schematic diagram of the specific structure of the connector according to an embodiment of the present invention;

[0029] Figure 7 This is a schematic diagram showing the connection between the electronic control unit, the sensing unit, and the tension sensor according to an embodiment of the present invention.

[0030] Figure 8 This is a schematic diagram of the state of the rope entry section relative to the rope entry pulley when it is tightened and relaxed according to an embodiment of the present invention;

[0031] Figure 9 This is a schematic diagram of the state of the rope entry section before and after the rope entry pulley adjustment according to an embodiment of the present invention.

[0032] Figure 10 This is a flowchart illustrating the method of using the telescopic boom hydraulic pipe pre-tensioning monitoring device according to an embodiment of the present invention.

[0033] Explanation of reference numerals in the attached figures

[0034] 1. Pulley mounting base; 11. Slide groove

[0035] 2. Tensioning mechanism 21. Rope entry pulley

[0036] 22 Tensioning assembly 221 Tensioning seat

[0037] 222 Tensioning screw 222a Threaded rod section

[0038] 222b Connecting part 222c First connecting hole

[0039] 223 Adjusting nut 224 Connector

[0040] 224a First mounting end 224b Second mounting end

[0041] 224c First pin hole; 224d Second pin hole

[0042] 23 Pin 3 Monitoring Agency

[0043] 31 Induction Plate Assembly 311 Plate Body

[0044] 311a First connecting end; 311b Second connecting end

[0045] 312 Buffer spring; 32 Sensing unit

[0046] 33 Sensor hole 34 Adjustment mounting base

[0047] 35 Tension sensor 4 Rope entry segment

[0048] 5. Basic boom 6. Electrical control unit

[0049] 7. Operation Display Unit Detailed Implementation

[0050] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0051] The telescopic boom hydraulic pipe pretensioning monitoring device of the present invention is described below with reference to the accompanying drawings.

[0052] This invention provides a telescopic boom hydraulic pipe pre-tension monitoring device, such as... Figure 1 and Figure 4 As shown, the telescopic boom hydraulic pipe pretension monitoring device includes:

[0053] The pulley mounting base 1 is used to be installed on the outer side of the peripheral wall of the base frame 5 of the telescopic boom and is provided with a groove 11 extending in the first direction;

[0054] The tensioning mechanism 2 includes a rope entry pulley 21 slidably installed in the slide groove 11 and a tensioning assembly 22 for pulling the rope entry pulley 21 to move in the slide groove 11. The rope entry pulley 21 is used to turn and wind the rope entry section 4 of the hydraulic pipe.

[0055] Monitoring mechanism 3 is used to monitor the angle of entry of the rope section 4 relative to the rope entry pulley 21; and

[0056] The electronic control unit 6 is connected to the monitoring mechanism 3 and is configured to generate a slack alarm signal when the change in the cutting angle of the rope section 4 relative to the rope pulley 21 is greater than a preset value.

[0057] Before using the telescopic boom hydraulic pipe pre-tensioning monitoring device of this invention, it is necessary to ensure that the telescopic boom hydraulic pipe pre-tensioning monitoring device and the telescopic boom are correctly installed. Correct installation means installing the pulley mounting base 1 on the outer side of the peripheral wall of the base boom 5 and ensuring that the first direction is parallel to the length direction of the base boom 5. Simultaneously, the head end of the hydraulic pipe should be wound around the rope entry pulley 21 to form the rope entry segment 4. After the rope entry segment 4 is wound around the rope entry pulley 21, a cutting angle will be formed between them. The cutting angle of the rope entry segment 4 will be different depending on the slack state (e.g., ...). Figure 5 As shown), the monitoring mechanism 3 monitors the cutting angle of the rope entry section 4 relative to the rope entry pulley 21 in real time, thereby enabling real-time monitoring of the tightness of the hydraulic pipe, such as... Figure 6 As shown, when the hydraulic hose sags, it can be re-tightened by simply pulling the rope pulley 21 along the length of the base boom 5 using the tensioning mechanism 2. In summary, this invention, by installing a hydraulic hose pre-tightening monitoring device on the telescopic boom, enables monitoring of the hydraulic hose's condition and secondary tightening without disassembling the boom, thus greatly simplifying the hydraulic hose maintenance process and reducing inspection and maintenance costs.

[0058] It needs to be explained that the basic boom 5 refers to the outermost boom of the telescopic boom, which is mainly used to connect with the turntable. The rope entry section 4 refers to the section of hydraulic pipe located between the basic boom 5 and the rope entry pulley 21. The rope entry section 4 remains stationary during the telescopic boom's extension and retraction. Figure 5 and Figure 6 As shown, when the hydraulic hose becomes slack, the tension of the hydraulic hose will decrease. At this time, due to the influence of the weight of the hose, the rope section 4 will sag, causing the cutting angle of the rope section 4 relative to the rope entry pulley 21 to change. When the change in cutting angle is greater than the preset value, it indicates that the slack of the rope section 4 has reached the warning line. Continued use may easily cause the hydraulic hose to fall off the pulley. At this time, the electronic control unit 6 will generate a slack alarm signal to warn the operator. After receiving the warning, the operator only needs to pull the rope entry pulley 21 along the length direction by the tensioning component 22 to tighten the rope section 4 again. The tightening of the rope section 4 also indicates that the other sections of the hydraulic hose are also in a taut state. Through this pre-tensioning monitoring device, the status detection and maintenance of the hydraulic hose can be achieved without disassembling the arm. The cutting angle mentioned above refers to the angle between the tangential direction of the initial contact position between the rope section 4 and the rope entry pulley 21 and the horizontal direction, specifically as shown in the figure. Figure 5 As shown by angle α in the diagram.

[0059] like Figure 1 , Figure 2 and Figure 7 As shown, in an embodiment of the present invention, one end of the rope entry segment 4 is wound around the rope entry pulley 21, and the other end is fixedly connected to the base boom 5. The monitoring mechanism 3 includes a sensor plate assembly 31 and a sensor unit 32. One end of the sensor plate assembly 31 is rotatably connected to the outer side of the peripheral wall of the base boom 5, and the other end is rotatably connected to the peripheral wall of the rope entry segment 4. The sensor unit 32 is used to monitor the tilt angle of the sensor plate assembly 31. The electronic control unit 6 is communicatively connected to the sensor unit 32 and is configured to generate a slack alarm signal when the change in the tilt angle of the sensor plate assembly 31 is greater than a preset value. The rope entry pulley 21 requires frequent adjustments to its installation position to accommodate the deformation of the hydraulic pipe. Therefore, to ensure smooth monitoring by the monitoring mechanism, theoretically, multiple monitoring points need to be set on the base boom to meet the monitoring requirements of different positions of the rope entry pulley 21. However, such a design obviously increases the complexity of monitoring. Therefore, to simplify the monitoring process, this invention uses a rotating connection between the fixed connection position of the rope entry section 4 pipe wall and the fixed connection position of the outer peripheral wall of the base boom 5 to connect the sensing plate assembly 31. The sensing unit 32 only needs to monitor the tilt angle of the sensing plate assembly 31 to achieve the status monitoring of the hydraulic pipe, and the installation of the sensing plate assembly 31 does not need to consider the position of the rope entry pulley 21. Specifically, as shown... Figure 8As shown, when the rope entry segment 4 becomes slack and droops, causing a change in the cutting angle, the first direction position of the connection between the sensing plate assembly 31 and the rope entry segment 4 will shift, and the height position at that point will decrease. This change in position will drive the sensing plate assembly 31 to swing, causing a change in the tilt angle of the sensing plate assembly 31. By detecting the change in the tilt angle of the sensing plate assembly 31 through the sensing unit 32, it can be determined whether the hydraulic pipe has become slack. During this process, no matter how the position of the rope entry pulley 21 changes, it will not affect the installation of the sensing plate assembly 31.

[0060] It should be emphasized that the electronic control unit 6 determines whether to issue a slack alarm signal by calculating the change in the tilt angle of the sensor panel assembly 31, while... Figure 8 and Figure 9 As shown, each time the position of the rope entry pulley 21 is adjusted to tighten the hydraulic pipe for the second time, the cutting angle of the rope entry section 4 and the tilt angle of the sensing plate assembly 31 will change. Therefore, in order to ensure that the monitoring function is normal, the electronic control unit 6 needs to re-initialize the initial calculation value of the tilt angle change after each adjustment of the position of the rope entry pulley 21.

[0061] In embodiments of the present invention, the sensing unit 32 may be a laser sensor, a laser angle meter, or the like.

[0062] like Figure 1 , Figure 2 and Figure 3As shown, in an embodiment of the present invention, the sensing plate assembly 31 is provided with a sensing hole 33, and the monitoring mechanism 3 further includes an adjustable mounting base 34 for adjustable mounting to the outer side of the peripheral wall of the base boom 5. The sensing unit 32 is disposed on the adjustable mounting base 34 and the sensing end is disposed towards the sensing plate assembly 31 in a first direction. By rotating the sensing plate assembly 31, the sensing unit 32 can be aligned with the sensing hole 33 in the first direction. The electronic control unit 6 is configured to issue a slack alarm signal when the sensing end of the sensing unit 32 is aligned with the sensing hole 33, or the electronic control unit 6 is configured to issue a slack alarm signal when the sensing end of the sensing unit 32 is misaligned with the sensing hole 33. Specifically, taking the example of the electronic control unit 6 being configured as a sensor unit 32 whose sensing end is aligned with the sensing hole 33 to issue a slack alarm signal, the sensing unit 32 can be a laser sensor. During initial installation, the laser sensor needs to be aligned with the sensing plate assembly 31 in the first direction and offset from the sensing hole 33. When the sensing plate assembly 31 swings due to the slack in the rope section 4, there will be an angle that aligns the laser sensor with the sensing hole 33 in the first direction. At this time, the electronic control unit 6 will issue a slack alarm signal to provide a slack warning, thereby monitoring the slack in the hydraulic pipe. By adjusting the installation height of the laser sensor, the offset distance between the sensing end and the sensing hole 33 can be adjusted, thus adjusting the alarm sensitivity of the electronic control unit 6. After the position of the rope pulley 21 is adjusted, the initial calculated value of the tilt angle change can be initialized by adjusting the installation height of the sensing unit 32. This initialization method is more intuitive and convenient for operators to adjust on-site. Of course, when the sensing unit 32 can be an angle measuring instrument, the initial calculated value can be initialized by program input. However, this method requires the timing of input and the operator needs to check whether the initialization result is accurate on the program display interface, which makes the operation inconvenient.

[0063] like Figure 2 As shown, in the embodiments of the present invention, there are many ways to make the height of the adjustable mounting base 34 adjustable, such as setting the adjustable mounting base 34 to be installed on the base boom 5 by bolts.

[0064] In an embodiment of the present invention, the swing direction of the induction plate assembly 31 is along the first direction, and the arrangement direction of the rope section 4 in the base boom 5 is along the length direction of the base boom 5. When the pulley mounting seat 1 is installed on the base boom 5, the first direction is parallel to the length direction.

[0065] like Figure 3As shown, in an embodiment of the present invention, the sensing plate assembly 31 includes a plate body 311 and a buffer spring 312. The plate body 311 has a first connecting end 311a and a second connecting end 311b. A sensing hole 33 is disposed between the first connecting end 311a and the second connecting end 311b. The first connecting end 311a is used for rotatable connection with the outer periphery of the base boom 5. The second connecting end 311b is hooked to the outer periphery of the rope entry section 4 by the buffer spring 312. When the rope entry section 4 becomes slack, the distance between the connection point of the sensing plate assembly 31 and the rope entry section 4 and the connection point of the sensing plate assembly 31 and the base boom 5 will change. The buffer spring 312 can compensate for this distance, thereby ensuring the smooth swing of the plate body 311. The buffer spring 312 can also increase the swing amplitude of the plate body 311. In order to simplify the installation of the sensing plate assembly 31, both ends of the sensing plate assembly 31 can be directly hooked and connected to the base boom 5 and the rope entry section 4, respectively.

[0066] like Figure 3 As shown, in this embodiment of the invention, the sensing hole 33 is a strip-shaped slot, with its two sides facing the first connecting end 311a and the second connecting end 311b, respectively. When the electronic control unit 6 is configured such that the sensing end of the sensing unit 32 is aligned with the sensing hole 33 to issue a slack alarm signal, the strip-shaped slot can extend the alarm time of the slack alarm signal, preventing the electronic control unit 6 from being unable to issue a slack alarm signal due to excessively fast oscillation of the sensing plate assembly 31. Conversely, when the electronic control unit 6 is configured such that the sensing end of the sensing unit 32 is misaligned with the sensing hole 33 to issue a slack alarm signal, the length of the strip-shaped slot can reduce the sensitivity of the alarm of the electronic control unit 6, preventing false alarms caused by hydraulic pipe swaying.

[0067] like Figure 1 and Figure 4 As shown, in an embodiment of the present invention, the slide groove 11 is an oblong groove. The rope entry pulley 21 is rotatably mounted on the slide groove 11 via a pin 23 and can slide along the slide groove 11. The tensioning assembly 22 is connected to the pin 23 and is used to pull the pin 23 to move within the slide groove 11. By pulling the pin 23 with the tensioning assembly 22, the movement of the rope entry pulley 21 in the first direction is achieved.

[0068] like Figure 1 and Figure 4As shown, in an embodiment of the present invention, the tensioning assembly 22 includes a tensioning seat 221, a tensioning screw 222 extending through the tensioning seat 221 along a first direction and with one end extending toward the pulley mounting seat 1, an adjusting nut 223 screwed onto the tensioning screw 222 and abutting against the tensioning seat 221, and a connector 224 for connecting the tensioning screw 222 and the pin 23. By rotating the adjusting nut 223, the tensioning screw 222 can pull the pin 23 along the first direction. Through the cooperation of the adjusting nut 223 and the tensioning screw 222, not only can the rope-entry pulley 21 be locked, but also a high-power pull on the rope-entry pulley 21 can be achieved with the help of a wrench.

[0069] Specifically, such as Figure 5 and Figure 6 As shown, the tensioning screw 222 includes a threaded rod portion 222a and a connecting portion 222b. The threaded rod portion 222a is provided with external threads, and the connecting portion 222b is provided with a first connecting hole 222c. The connector 224 includes a first mounting end 224a and a second mounting end 224b. The first mounting end 224a is provided with a first pin hole 224c for mating with the first connecting hole 222c, and the second mounting end 224b is provided with a second pin hole 224d for connecting with the pin (23).

[0070] like Figure 7 As shown, in an embodiment of the present invention, the monitoring mechanism 3 further includes a tension sensor 35. The tension sensor 35 is disposed between the tension screw 222 and the connector 224 and is used to monitor the tension of the tension screw 222 on the rope-entry pulley 21. The electronic control unit 6 is configured to issue a pre-tension termination signal when the tension of the tension screw 222 on the rope-entry pulley 21 is greater than a preset value. The tension sensor 35 can quantify the pre-tension force on the hydraulic pipe, thereby determining whether the hydraulic pipe is properly tensioned. At the same time, the change in the detection value of the tension sensor 35 can also reflect whether the hydraulic pipe has become loose to a certain extent. It should be noted that the change in the value detected by the tension sensor 35 can only serve as an auxiliary criterion for determining whether the hydraulic hose has become slack. In some special cases, such as when the hydraulic hose deforms and elongates, but the elongation is still within a safe operating range, or when the center of gravity of the hydraulic hose changes due to the tilt of the boom during high-altitude operations, but the hydraulic hose remains taut, although these situations will cause a change in the value detected by the tension sensor 35, there is no need to re-tighten the hydraulic hose. Therefore, relying solely on the fluctuation of the tension sensor's sensing data as a criterion is prone to false alarms. This invention, by directly detecting the cutting angle of the rope segment 4, can intuitively and accurately monitor the state of the hydraulic hose, avoiding false alarms.

[0071] like Figure 7As shown, in an embodiment of the present invention, the telescopic boom hydraulic pipe pretension monitoring device further includes an operation display unit 7, which can display the specific data and alarm signals of the tension sensor 35.

[0072] like Figure 1 As shown, to achieve the above objectives, the present invention also provides an engineering vehicle, wherein the engineering vehicle includes a telescopic boom and a telescopic boom hydraulic pipe pre-tensioning monitoring device according to the above description, the telescopic boom hydraulic pipe pre-tensioning monitoring device being installed on the telescopic boom and used to monitor the tightness of the hydraulic pipes inside the telescopic boom.

[0073] In an embodiment of the present invention, the telescopic boom includes a base boom 5, a multi-section telescopic boom sleeved within the base boom 5, and hydraulic pipes passing through the telescopic boom. A pulley mounting base 1 is installed on the outer side of the peripheral wall of the base boom 5, and its first direction coincides with the length direction of the base boom 5. The tensioning assembly 22 can pull the rope-entry pulley 21 along the length direction. Since the engineering vehicle adopts all the technical solutions of the above embodiments, it at least has the beneficial effects brought by the above embodiments, which will not be elaborated further here.

[0074] like Figure 10 As shown, to achieve the above objectives, the present invention also provides a method for using the telescopic boom hydraulic pipe pre-tension monitoring device, wherein the method for using the telescopic boom hydraulic pipe pre-tension monitoring device includes:

[0075] S100: Provides the above-mentioned telescopic boom hydraulic pipe pre-tension monitoring device, and allows the rope entry section 4 of the telescopic boom hydraulic pipe to turn and wrap around the rope entry pulley 21.

[0076] S200: The tensioning mechanism 2 pulls the rope entry pulley 21 along the length direction to tighten the hydraulic pipe until the pre-tightening force of the hydraulic pipe reaches the preset value. Then, the installation position of the monitoring mechanism 3 is adjusted to monitor the cutting angle of the rope entry section 4 relative to the rope entry pulley 21.

[0077] S300: If the electronic control unit 6 issues a slack alarm signal again after the telescopic boom has been used for a period of time, the rope pulley 21 will be pulled again by the tensioning mechanism 2 so that the pre-tension of the hydraulic pipe reaches the preset value again, and the installation position of the monitoring mechanism 3 will be readjusted.

[0078] This invention allows for adjustment of the installation position of the monitoring mechanism 3 simply by adjusting the installation height of the sensing unit 32, thanks to the sensing hole 33 provided on the sensing plate assembly 31. Furthermore, for ease of installation, the sensing plate assembly 31 can be directly connected to the rope section 4 and the base arm 5 using a hook-and-loop connection.

[0079] In summary, the method of using the telescopic boom hydraulic pipe pre-tightening monitoring device of the present invention can obtain the status of the hydraulic pipe and perform secondary tightening of the hydraulic pipe without disassembling the boom, which greatly reduces the maintenance cost and difficulty of the telescopic boom hydraulic pipe.

[0080] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0081] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0082] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0083] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A pre-tensioning monitoring device for hydraulic pipes of a telescopic boom, characterized in that, The telescopic boom hydraulic pipe pre-tensioning monitoring device includes: A pulley mounting base (1) is used to be installed on the outer side of the peripheral wall of the telescopic boom base frame (5) and is provided with a groove (11) extending in the first direction. The tensioning mechanism (2) includes a rope entry pulley (21) slidably installed in the groove (11) and a tensioning assembly (22) for pulling the rope entry pulley (21) to move in the groove (11), the rope entry pulley (21) being used to turn and wind the rope entry section (4) of the hydraulic pipe; Monitoring mechanism (3) for monitoring the angle of entry of the rope segment (4) relative to the rope entry pulley (21); and The electronic control unit (6) is communicatively connected to the monitoring mechanism (3) and configured to generate a slack alarm signal when the change in the cutting angle of the rope entry segment (4) relative to the rope entry pulley (21) is greater than a preset value; The monitoring mechanism (3) includes a sensor plate assembly (31) and a sensing unit (32). One end of the sensor plate assembly (31) is rotatably connected to the outer side of the peripheral wall of the base boom (5), and the other end is rotatably connected to the peripheral wall of the rope entry section (4). The sensor plate assembly (31) is provided with a sensing hole (33), which is a strip-shaped slot. The sensing hole (33) extends toward both ends of the sensor plate assembly (31). The sensing end of the sensing unit (32) is aligned with the sensing hole (33) in the first direction. The electronic control unit (6) is configured to issue the slack alarm signal when the sensing end of the sensing unit (32) is aligned with the sensing hole (33), and to issue the slack alarm signal when it is misaligned.

2. The telescopic boom hydraulic pipe pre-tensioning monitoring device according to claim 1, characterized in that, One end of the rope entry section (4) is wound around the rope entry pulley (21), and the other end is fixedly connected to the base boom (5).

3. The telescopic boom hydraulic pipe pre-tightening monitoring device according to claim 2, characterized in that, The monitoring mechanism (3) further includes an adjustable mounting base (34) for height-adjustable installation on the outer periphery of the base boom (5). The sensing unit (32) is disposed on the adjustable mounting base (34) and the sensing end is disposed toward the sensing plate assembly (31) along the first direction. By rotating the sensing plate assembly (31), the sensing unit (32) can be aligned with the sensing hole (33) in the first direction.

4. The telescopic boom hydraulic pipe pre-tightening monitoring device according to claim 3, characterized in that, The sensing plate assembly (31) includes a plate body (311) and a buffer spring (312). The plate body (311) is provided with a first connecting end (311a) and a second connecting end (311b). The sensing hole (33) is disposed between the first connecting end (311a) and the second connecting end (311b). The first connecting end (311a) is used to rotatably connect with the outer side of the peripheral wall of the base boom (5). The second connecting end (311b) is hooked on the outer peripheral wall of the rope entry section (4) by the buffer spring (312).

5. The telescopic boom hydraulic pipe pre-tensioning monitoring device according to any one of claims 1 to 4, characterized in that, The groove (11) is a waist-shaped groove. The rope pulley (21) is rotatably mounted on the groove (11) via a pin (23) and can slide along the groove (11). The tensioning assembly (22) is connected to the pin (23) and is used to pull the pin (23) to move within the groove (11).

6. The telescopic boom hydraulic pipe pre-tightening monitoring device according to claim 5, characterized in that, The tensioning assembly (22) includes a tensioning seat (221), a tensioning screw (222) that passes through the tensioning seat (221) in a first direction and extends one end toward the pulley mounting seat (1), an adjusting nut (223) that is screwed onto the tensioning screw (222) and abuts against the tensioning seat (221), and a connector (224) for connecting the tensioning screw (222) and the pin (23). By rotating the adjusting nut (223), the tensioning screw (222) can pull the pin (23) in the first direction.

7. The telescopic boom hydraulic pipe pre-tensioning monitoring device according to claim 6, characterized in that, The tensioning screw (222) includes a threaded rod portion (222a) and a connecting portion (222b). The threaded rod portion (222a) is provided with external threads. The connecting portion (222b) is provided with a first connecting hole (222c). The connector (224) includes a first mounting end (224a) and a second mounting end (224b). The first mounting end (224a) is provided with a first pin hole (224c) for mating with the first connecting hole (222c). The second mounting end (224b) is provided with a second pin hole (224d) for connecting with the pin (23).

8. The telescopic boom hydraulic pipe pre-tightening monitoring device according to claim 6, characterized in that, The monitoring mechanism (3) further includes a tension sensor (35), which is disposed between the tension screw (222) and the connector (224) and is used to monitor the tension of the tension screw (222) on the rope entry pulley (21). The electronic control unit (6) is configured to issue a pre-tensioning termination signal when the tension of the tension screw (222) on the rope entry pulley (21) is greater than a preset value.

9. An engineering vehicle, characterized in that, The device includes a telescopic boom and a telescopic boom hydraulic pipe pretension monitoring device according to any one of claims 1 to 8, wherein the telescopic boom hydraulic pipe pretension monitoring device is installed on the telescopic boom and is used to monitor the tightness of the hydraulic pipe inside the telescopic boom.

10. The engineering vehicle according to claim 9, characterized in that, The telescopic boom includes a base boom (5), a multi-section telescopic boom sleeved in the base boom (5), and hydraulic pipes passing through the telescopic boom. The pulley mounting base (1) is installed on the outer side of the peripheral wall of the base boom (5) and the first direction coincides with the length direction of the base boom (5). The tensioning assembly (22) can pull the rope entry pulley (21) along the length direction.

11. A method for using a telescopic boom hydraulic pipe pre-tightening monitoring device, characterized in that, The method of using the telescopic boom hydraulic pipe pre-tensioning monitoring device includes: Provide a telescopic boom hydraulic pipe pretension monitoring device according to any one of claims 1 to 8, and allow the rope entry section (4) of the telescopic boom hydraulic pipe to turn and wrap around the rope entry pulley (21); The tensioning mechanism (2) pulls the rope entry pulley (21) along the length direction to tighten the hydraulic pipe until the pre-tension force of the hydraulic pipe reaches the preset value. Then, the installation position of the monitoring mechanism (3) is adjusted to monitor the cutting angle of the rope entry section (4) relative to the rope entry pulley (21). If the electronic control unit (6) issues the slack alarm signal after the telescopic boom has been used for a period of time, the rope entry pulley (21) will be pulled again by the tensioning mechanism (2) so that the pre-tension force of the hydraulic pipe reaches the preset value again, and the installation position of the monitoring mechanism (3) will be readjusted.

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