Folding arm, method for unfolding the same and fire fighting vehicle

Abstract

The embodiment of the present application provides a folding arm frame, which comprises a mounting seat, a first telescopic arm frame, a second telescopic arm frame, a folding oil cylinder, a swing rod and a connecting rod, the mounting seat comprises a first hinge point and a second hinge point which is arranged at intervals from the first hinge point, the head of the first arm frame is fixedly connected with the mounting seat, the tail of the second arm frame is pivotally connected with the first hinge point, one end of the folding oil cylinder is pivotally connected with the second arm frame, when the folding oil cylinder is in an initial state, the second arm frame is arranged side by side on one side of the first arm frame in the width direction, one end of the swing rod is pivotally connected with the other end of the folding oil cylinder, the other end of the swing rod is pivotally connected with the second hinge point, one end of the connecting rod is pivotally connected with the second arm frame, and the other end of the connecting rod is pivotally connected between the two ends of the swing rod. The embodiment of the present application also provides a folding method of the folding arm frame and a fire fighting truck with the folding arm frame.

Description

Technical Field

[0001] This application relates to the field of engineering vehicle technology, and in particular to a folding boom, a method for deploying the folding boom, and a fire truck. Background Technology

[0002] Existing fire trucks use folding booms to reach high altitudes for firefighting or rescue operations. However, the folding booms of existing fire trucks require a considerable amount of time to unfold, especially in confined spaces, where the folding booms are difficult to unfold quickly, significantly impacting the overall operational efficiency of the vehicle. Summary of the Invention

[0003] In view of this, the embodiments of this application aim to provide a folding boom, a method for deploying the folding boom, and a fire truck, wherein the folding boom can be deployed quickly. To achieve the above-mentioned beneficial effects, the technical solution of the embodiments of this application is implemented as follows:

[0004] One embodiment of this application provides a folding boom, including:

[0005] The mounting base includes a first hinge point and a second hinge point spaced apart from the first hinge point;

[0006] A telescopic first boom, the head of which is fixedly connected to the mounting base;

[0007] A telescopic second boom, the tail of which is pivotally connected to the first hinge point;

[0008] A folding hydraulic cylinder, one end of which is pivotally connected to the second boom. When the folding hydraulic cylinder is in its initial state, the second boom is arranged side by side on one side of the width direction of the first boom.

[0009] A swing arm, one end of which is pivotally connected to the other end of the folding cylinder, and the other end of which is pivotally connected to the second hinge point; and

[0010] A connecting rod, one end of which is pivotally connected to the second boom, and the other end of which is pivotally connected between the two ends of the swing arm.

[0011] Furthermore, when the folding cylinder is in its initial state, the projection of the swing arm along the width direction of the first boom is located within the projection of the first boom.

[0012] Furthermore, the mounting base includes:

[0013] A connecting beam, one end of which is fixedly connected to the head of the first boom; and

[0014] An ear seat is provided at the other end of the connecting beam, and the first hinge point and the second hinge point are respectively located on the ear seat.

[0015] Furthermore, the first boom includes:

[0016] First basic arm;

[0017] The first telescopic arm is sleeved inside the first basic arm, and the mounting base is fixedly connected to the head of the first telescopic arm.

[0018] The first telescopic cylinder is located inside the first telescopic arm. The piston rod of the first telescopic cylinder is fixedly connected to the first basic arm, and the cylinder barrel of the first telescopic cylinder is fixedly connected to the first telescopic arm.

[0019] The first cable chain assembly includes a first pallet and a first cable chain fixedly connected to one end of the first pallet. The other end of the first pallet is fixedly connected to the first basic arm, and the other end of the first cable chain is fixedly connected to the cylinder of the first telescopic cylinder.

[0020] A support member, connected to the first tray, for supporting the first tray; and

[0021] A support member is mounted on the cylinder of the first telescopic cylinder, and the support member supports the first pallet and is movable relative to the first pallet.

[0022] Furthermore, the second boom includes:

[0023] The second basic arm, the tail of which is pivotally connected to the first hinge point, one end of the folding cylinder is pivotally connected to the second basic arm, and one end of the connecting rod is pivotally connected to the second basic arm;

[0024] The second telescopic arm is fitted inside the second basic arm;

[0025] The second telescopic cylinder is located inside the second telescopic arm. The piston rod of the second telescopic cylinder is fixedly connected to the second basic arm, and the cylinder barrel of the second telescopic cylinder is fixedly connected to the second telescopic arm.

[0026] The second cable chain assembly includes a second pallet and a second cable chain fixedly connected to one end of the second pallet, the other end of the second pallet being fixedly connected to the second base arm, and the other end of the second cable chain being fixedly connected to the cylinder of the second telescopic hydraulic cylinder; and

[0027] The guide member is obliquely installed at one end of the cylinder barrel of the second telescopic cylinder near the piston rod of the second telescopic cylinder, relative to the telescopic direction of the second telescopic cylinder. The height of the end of the guide member near the piston rod of the second telescopic cylinder is lower than that of the end near the cylinder barrel of the second telescopic cylinder.

[0028] This application embodiment also provides a fire truck, including:

[0029] Chassis;

[0030] A turntable is mounted on the chassis;

[0031] The folding boom described in any one of the preceding claims, wherein the tail portion of the first boom of the folding boom is pivotally connected to the turntable; and

[0032] A luffing cylinder, one end of which is pivotally connected to the turntable, and the other end of which is pivotally connected to the first boom.

[0033] Furthermore, there are two luffing cylinders, and the distance between the two pivot points of the luffing cylinders on the turntable is greater than the distance between the two pivot points of the luffing cylinders on the first boom.

[0034] Another aspect of this application provides a method for deploying a folding boom, applied to any of the fire trucks described above, the deployment method comprising:

[0035] Extend the folding cylinder and unfold the second boom to a preset first angle in the opposite direction;

[0036] Extend the second boom to a preset first length.

[0037] Furthermore, the unfolding method also includes:

[0038] Extend the luffing cylinder to raise the first boom to its maximum elevation angle;

[0039] Extend the first boom to a preset second length.

[0040] Furthermore, the unfolding method also includes:

[0041] Extend the luffing cylinder to raise the first boom to a preset second angle;

[0042] Fully extend the first boom;

[0043] Fully extend the second boom.

[0044] The folding boom provided in this application embodiment has a folding cylinder that extends to drive the second boom to unfold relative to the first boom, centered on the axis of the first hinge point. In other words, the second boom can unfold from above the first boom. Because the space above the folding boom is larger and more open, it effectively solves the technical problem of the narrow space below the folding boom restricting the unfolding of the second boom, requiring the first boom to be unfolded first, resulting in low unfolding efficiency of the second boom. This application embodiment also provides the unfolding method of the above-described folding boom and a fire truck with the above-described folding boom, which have the same beneficial effects as the folding boom described above. Attached Figure Description

[0045] Figure 1 This is a structural schematic diagram of a folding boom provided in an embodiment of this application, wherein the folding cylinder is in the extended state;

[0046] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0047] Figure 3 for Figure 1 A structural diagram of the folding boom in another state, where the folding cylinder is in its initial state;

[0048] Figure 4 for Figure 1 Assembly diagram of the first boom and mounting base;

[0049] Figure 5 for Figure 3 A structural schematic diagram of the folding boom from another perspective;

[0050] Figure 6 for Figure 1 A structural diagram of a folding boom in another state, wherein the second boom is extended in the opposite direction by 180°;

[0051] Figure 7 This is a schematic diagram of a first boom in one state according to an embodiment of this application, wherein the first telescopic boom is in a retracted state;

[0052] Figure 8 for Figure 7 Enlarged view of point B in the middle;

[0053] Figure 9 for Figure 7 A schematic diagram of another state of the first boom, in which the first telescopic boom is in the extended state;

[0054] Figure 10 for Figure 9 Enlarged view of point C in the middle;

[0055] Figure 11 This is a schematic diagram of a second boom in one state according to an embodiment of this application, wherein the second telescopic boom is in a retracted state;

[0056] Figure 12 for Figure 11 Another structural diagram of the second boom;

[0057] Figure 13 for Figure 12 Enlarged view at point D;

[0058] Figure 14 A flowchart illustrating a method for unfolding a folding boom as provided in an embodiment of this application;

[0059] Figure 15 A schematic diagram of the main combat operating conditions of a fire truck provided in an embodiment of this application;

[0060] Figure 16 This is a schematic diagram of a fire truck operating under small-amplitude high-pressure spray conditions provided in an embodiment of this application; it shows the state in which the first boom extends to two different second lengths, the luffing cylinder raises the first boom to the maximum elevation angle, and the second boom extends in the opposite direction to two different first angles;

[0061] Figure 17 This is a schematic diagram of a fire truck operating under high-pressure spray conditions according to an embodiment of this application; it shows the first boom fully extended, the second boom fully extended, and the luffing cylinder lifting the first boom to two different second angles.

[0062] Explanation of reference numerals in the attached figures

[0063] Folding boom 100; mounting base 110; connecting beam 111; lug 112; first hinge point 110a; second hinge point 110b; first boom 120; first basic boom 121; first telescopic boom 122; first telescopic cylinder 123; piston rod of the first telescopic cylinder 1231; cylinder barrel of the first telescopic cylinder 1232; first cable chain assembly 124; first pallet 1241; connector 12411; slotted plate 12412; first cable chain 1242; support member 125; support 1251; 1252; 12521; 12522; 126; 130; 131; 132; 133; 133; 1331; 1332; 134; 1341; 1342; 135; 140; 150; 160; 200; Detailed Implementation

[0064] It should be noted that, unless otherwise specified, the embodiments and technical features in the embodiments of this application can be combined with each other, and the detailed descriptions in the specific implementation should be understood as explanations of the purpose of this application and should not be regarded as undue limitations on this application.

[0065] In the description of this application, the orientation or positional relationship refers to the orientation or positional relationship of the folding boom during normal use. "Reverse" refers to the direction in which the second boom extends upwards, for example, as shown in the attached image. Figure 1 The directions shown refer to the opposite direction to the reverse direction, i.e., the direction in which the second boom extends downwards. It should be understood that these directional terms are for the convenience of describing this application and simplifying the description only, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this application.

[0066] Please see Figures 1-6 This application provides a folding boom 100, which includes a mounting base 110, a telescopic first boom 120, a telescopic second boom 130, a folding cylinder 140, a swing arm 150, and a connecting rod 160. The mounting base 110 includes a first hinge point 110a and a second hinge point 110b spaced apart from the first hinge point 110a. The head of the first boom 120 is fixedly connected to the mounting base 110. The tail of the second boom 130 is pivotally connected to the first hinge point 110a. One end of the folding cylinder 140 is pivotally connected to the second boom 130. When the folding cylinder 140 is in its initial state, the second boom 130 is arranged side-by-side with the first boom 120 along its width. One end of the swing arm 150 is pivotally connected to the other end of the folding cylinder 140. The other end of the swing arm 150 is pivotally connected to the second hinge point 110b. One end of the connecting rod 160 is pivotally connected to the second boom 130. The other end of the connecting rod 160 is pivotally connected between the two ends of the rocker arm 150.

[0067] Existing fire trucks are equipped with folding booms and delivery pipes on their chassis. These pipes transport firefighting materials such as water or foam and run along the folding boom. The height of the delivery pipes is adjusted by extending the folding boom, allowing for firefighting operations at different heights. However, due to height restrictions imposed on the fire truck's overall height during operation (e.g., the overall height must be less than or equal to 4 meters), and the chassis also has a limited height, the only way to reduce the overall height of the folding boom is usually by decreasing its cross-sectional height. This reduces the boom's strength and rigidity, posing safety risks. Furthermore, in existing technology, the folding boom extends forward, requiring the lifting arm to first extend upwards in the pitch direction to create space for downward and outward extension. Since the space beneath the folding boom is limited, especially in confined spaces between buildings, this space constraint makes extension difficult or even impossible, potentially leading to lost rescue opportunities.

[0068] In this embodiment of the application, when the folding cylinder 140 is in its initial state (see [link]), Figure 3 The second boom 130 is arranged side by side on one side of the width direction of the first boom 120. In this way, the first boom 120 and the second boom 130 can not only have a large cross-sectional height to ensure structural strength and rigidity, but also reduce the space occupied by the first boom 120 and the second boom 130 in the height direction because the second boom 130 is arranged side by side on one side of the width direction of the first boom 120. This makes it easier for fire trucks equipped with folding booms 100 to travel on urban roads or highways, and avoids fire trucks exceeding the height limit of urban roads or highways.

[0069] One end of the folding cylinder 140 is pivotally connected to the second boom 130, and the other end of the folding cylinder 140 is pivotally connected to one end of the swing arm 150. The other end of the swing arm 150 is pivotally connected to the second hinge point 110b. The folding cylinder 140 extends to drive the second boom 130 to unfold relative to the first boom 120 about the axis of the first hinge point 110a. That is, the folding cylinder 140 extends to drive the second boom 130 to unfold relative to the first boom 120 about the axis of the first hinge point 110a. Figure 1 In the reverse deployment, the second boom 130 can be deployed from the space above the first boom 120. Since the space above the folding boom 100 is larger and more open, it effectively solves the technical problem that the narrow space below the folding boom 100 restricts the deployment of the second boom 130. In actual rescue, the fire truck can quickly carry out fire rescue by deploying the second boom 130 in the reverse direction.

[0070] In addition, the telescopic first boom 120 and the telescopic second boom 130 facilitate increasing the unfolded height of the folding boom 100, thereby expanding the spray range of the fire truck and achieving ultra-high height and ultra-wide spraying.

[0071] The design of the folding boom 100 solves the technical problems of difficulty in unfolding the folding boom in confined spaces and low unfolding efficiency. It also allows fire trucks to have a larger spray range and improve rescue capabilities while meeting relevant regulations.

[0072] It should be noted that the initial state of the folding cylinder 140 refers to the state when the fire truck is in motion and the second boom 130 is retracted. At this time, the folding cylinder 140 is generally designed not to be extended.

[0073] In one embodiment, please refer to Figure 3 and Figure 5 When the folding cylinder 140 is in its initial state, the projection of the swing arm 150 along the width direction of the first boom 120 lies within the projection of the first boom 120. This further reduces the space occupied by the swing arm 150 and the second boom 130 in the height direction of the first boom 120, making the structure of the folding boom 100 more compact.

[0074] In one embodiment, please refer to Figure 3 and Figure 4 The mounting base 110 includes a connecting beam 111 and an ear seat 112. One end of the connecting beam 111 is fixedly connected to the head of the first boom 120. The ear seat 112 is located at the other end of the connecting beam 111. The first hinge point 110a and the second hinge point 110b are respectively located on the ear seat 112. That is, the connecting beam 111 is arranged along the width direction of the first boom 120. By setting the first boom 120 and the second boom 130 at both ends of the connecting beam 111, when the folding cylinder 140 is in its initial state, the second boom 130 is arranged side by side on one side of the width direction of the first boom 120.

[0075] In one embodiment, please refer to Figures 7-10 The first boom 120 includes a first base boom 121, a first telescopic boom 122, a first telescopic cylinder 123, a first cable chain assembly 124, a support member 125, and a support member 126. The first telescopic boom 122 is sleeved inside the first base boom 121. The mounting base 110 is fixedly connected to the head of the first telescopic boom 122. The first telescopic cylinder 123 is located inside the first telescopic boom 122. The piston rod 1231 of the first telescopic cylinder is fixedly connected to the first base boom 121. The cylinder barrel 1232 of the first telescopic cylinder is fixedly connected to the first telescopic boom 122.

[0076] The first cable chain assembly 124 includes a first support plate 1241 and a first cable chain 1242 fixedly connected to one end of the first support plate 1241. The other end of the first support plate 1241 is fixedly connected to a first base arm 121. The other end of the first cable chain 1242 is fixedly connected to the cylinder 1232 of a first telescopic hydraulic cylinder. A support member 125 is connected to the first support plate 1241 and is used to support the first support plate 1241.

[0077] The support member 126 is mounted on the cylinder 1232 of the first telescopic cylinder. The support member 126 supports the first support plate 1241 and is movable relative to the first support plate 1241. Specifically, the support member 126 is connected to the cylinder 1232 of the first telescopic cylinder, so the support member 126 moves with the movement of the cylinder 1232 of the first telescopic cylinder.

[0078] During the extension or retraction of the first telescopic boom 122 relative to the first base boom 121, the cable bundle arranged within the first cable chain assembly 124 moves along with the first telescopic boom 122. However, during the development process, it was discovered that during the retraction of the first telescopic boom 122, the first telescopic boom 122 may become stuck and stop retraction before fully returning to its original position. This problem severely affects the extension and retraction of the first boom 120, but because the problem only occurs during the retraction of the first telescopic boom 122, the cause of the problem is very difficult to find. The technicians of this application have conducted a comprehensive analysis and study of the structure of each component of the first boom 120 and its control system. The results showed that during the retraction of the cylinder 1232 of the first telescopic cylinder, the first drag chain 1242 itself has a certain degree of deflection and is prone to deformation and sagging under the action of gravity. This causes the end of the first support plate 1241 connected to the first drag chain 1242 to sag, blocking the smooth passage of the support member 126 fixedly installed on the cylinder 1232 of the first telescopic cylinder. As a result, the cylinder 1232 of the first telescopic cylinder gets stuck during the retraction of the first telescopic cylinder 123, causing the first telescopic arm 122 to be unable to retract completely.

[0079] Figure 7 With the first telescopic arm 122 in the retracted state, the cylinder 1232 of the first telescopic cylinder is also in the retracted state. During the extension of the cylinder 1232 relative to the piston rod 1231 of the first telescopic cylinder, since one end of the first cable chain 1242 and the first telescopic arm 122 are fixedly connected to the cylinder 1232 of the first telescopic cylinder, the cylinder 1232 of the first telescopic cylinder drives one end of the first cable chain 1242 and the first telescopic arm 122 to move from the tail of the first base arm 121 to the head of the first base arm 121. Finally, the first telescopic arm 122 is in the fully extended state (see [link to relevant documentation]). Figure 9During the extension of the cylinder 1232 of the first telescopic cylinder, the supporting member 126 provides support to the first support plate 1241 and the support member 125 connected to it during the movement of the cylinder 1232. The supporting member 126 first supports the first support plate 1241, and then, as the extension length of the cylinder 1232 changes, the supporting member 126 passes over the first support plate 1241 and contacts the support member 125 at the end connected to the first cable chain 1242. The first cable chain 1242 does not interfere with the movement of the cylinder 1232 of the first telescopic cylinder. The first telescopic arm 122 is in the extended state (see [link to previous text]). Figure 9 Return to the retracted state of the first telescopic boom 122 (see [link]). Figure 7 When the cylinder 1232 of the first telescopic cylinder returns from the extended state to the retracted state, the cylinder 1232 of the first telescopic cylinder drives one end of the first drag chain 1242 and the first telescopic arm 122 to move from the head to the tail of the first base arm 121. During this movement, the support member 125 effectively supports the first pallet 1241, preventing the first pallet 1241 from drooping due to the drag chain 1242. This allows the holding member 126 to smoothly return to support the first pallet 1241, avoiding the first pallet 1241 drooping and hindering the normal operation of the holding member 126. This effectively solves the problem that the cylinder 1232 of the first telescopic cylinder gets stuck during the retraction of the first telescopic cylinder 123, causing the first telescopic arm 122 to be unable to retract completely.

[0080] In some embodiments, see Figure 7 and Figure 9 The first pallet 1241 includes a connector 12411 and a groove plate 12412. One end of the groove plate 12412 is connected to the first basic arm 121, and the other end of the groove plate 12412 is connected to one end of the connector 12411. The other end of the connector 12411 is connected to the first cable chain 1242. By setting a corresponding connector 12411 according to the specific structural form of the first cable chain 1242, the connection between the first pallet 1241 and the first cable chain 1242 can be more conveniently realized, and the positions of the first pallet 1241 and the first cable chain 1242 can be rationally arranged. For example, by changing the width of the connector 12411, the two first cable chains 1242 can be symmetrically arranged on both sides of the groove plate 12412 and located on both sides of the first telescopic cylinder 123, thereby reducing the width of the groove plate 12412. Furthermore, the end of the first pallet 1241 connected to the first basic arm 121 can be connected by an intermediate part such as a connecting plate, or the first pallet 1241 can be directly connected to the first basic arm 121.

[0081] In some embodiments, see Figure 7 and Figure 10 The support member 125 includes a support rod 1251 and a support base 1252. One end of the support rod 1251 is connected to the first support plate 1241, and the other end of the support rod 1251 is connected to the support base 1252. The support base 1252 is supported on the cylinder 1232 of the first telescopic cylinder. That is, the cylinder 1232 of the first telescopic cylinder moves relative to the support base 1252, and the cylinder 1232 of the first telescopic cylinder provides support force to the support base 1252, thereby supporting the first support plate 1241. In a specific embodiment, the support base 1252 includes a support frame 12521 and a roller 12522. The support frame 12521 is connected to the support rod 1251, and the roller 12522 is rotatably mounted on the support frame 12521 and can roll along the cylinder 1232 of the first telescopic cylinder.

[0082] In some embodiments, the support member 125 may also be supported on the cylinder 1232 of the first telescopic cylinder by a sliding pair, which can slide along the outer surface of the cylinder.

[0083] In one specific embodiment, there are two first drag chains 1242, which are symmetrically arranged on both sides of the support member.

[0084] In one embodiment, please refer to Figures 1-2 and Figures 11-13 The second boom 130 includes a second basic boom 131, a second telescopic boom 132, a second telescopic cylinder 133, a second cable chain assembly 134, and a guide member 135. The tail of the second basic boom 131 is pivotally connected to the first hinge point 110a. One end of the folding cylinder 140 is pivotally connected to the second basic boom 131. One end of the connecting rod 160 is pivotally connected to the second basic boom 131. The second telescopic boom 132 is sleeved inside the second basic boom 131. The second telescopic cylinder 133 is located inside the second telescopic boom 132. The piston rod 1331 of the second telescopic cylinder is fixedly connected to the second basic boom 131. The cylinder barrel 1332 of the second telescopic cylinder is fixedly connected to the second telescopic boom 132. The second cable chain assembly 134 includes a second support plate 1341 and a second cable chain 1242 fixedly connected to one end of the second support plate 1341. The other end of the second support plate 1341 is fixedly connected to the second basic boom 131. The other end of the second cable chain 1242 is fixedly connected to the cylinder 1332 of the second telescopic cylinder. Relative to the telescopic direction of the second telescopic cylinder 133, the guide 135 is obliquely installed at one end of the cylinder 1332 of the second telescopic cylinder near the piston rod 1331 of the second telescopic cylinder. The height of the end of the guide 135 near the piston rod 1331 of the second telescopic cylinder is lower than the end near the cylinder 1332 of the second telescopic cylinder.

[0085] Figure 11With the second telescopic arm 132 in its retracted state, the second telescopic cylinder 133 is also in its retracted state. The cylinder barrel 1332 of the second telescopic cylinder extends relative to the piston rod 1331. Since one end of the second cable chain 1342 and the second telescopic arm 132 are both fixedly connected to the cylinder barrel 1332, the cylinder barrel 1332 drives one end of the second cable chain 1342 and the second telescopic arm 132 to move from the tail end to the head end of the second base arm 131. Finally, the second telescopic arm 132 is fully extended. During the extension of the second telescopic arm 132, the connection between the second cable chain 1342 and the second telescopic cylinder 133 is naturally supported by the outer surface of the cylinder barrel 1332, and the second cable chain 1342 does not interfere with the movement of the cylinder barrel 1332. When the second telescopic arm 132 returns from the extended state to the retracted state, and the cylinder 1332 of the second telescopic cylinder returns from the extended state to the retracted state, the cylinder 1332 of the second telescopic cylinder drives one end of the second drag chain 1342 and the second telescopic arm 133 to move from the head of the second basic arm 131 to the tail of the second basic arm 131. The portion of the second cable chain 1342 located at the tail end of the cylinder 1332 of the second telescopic cylinder is suspended. The connection between the second support plate 1341 and the second cable chain 1342 is no longer supported by the cylinder 1332 of the second telescopic cylinder. The connection between the second support plate 1341 and the second cable chain 1342 will deform downward under the gravity of the second cable chain 1342. In this embodiment, a guide member 135 is installed obliquely at one end of the cylinder 1332 of the second telescopic cylinder near the piston rod 1331 of the second telescopic cylinder. That is, the guide member 135 is obliquely fixed at one end of the cylinder 1332 of the second telescopic cylinder near the tail end of the first basic arm 131. Since the height of the end of the guide member 135 near the piston rod 1331 of the second telescopic cylinder is lower than the height of the end near the cylinder 1332 of the second telescopic cylinder, the guide member 135 has a guide surface that is inclined towards the second cable chain 1342 in the retraction direction of the second telescopic cylinder 133. In other words, with the folding cylinder 140 in its initial state, the guide surface of the guide member 135 is inclined upward along the retraction direction of the second telescopic cylinder 133. During the retraction process, the second cable chain 1342 slides along the guide member 135 in a direction away from the cylinder 1332 of the second telescopic cylinder, thereby effectively solving the problem that the second cable chain 1342 droops and gets stuck at the end of the cylinder 1332 of the second telescopic cylinder, causing the second telescopic arm 132 to be unable to retract completely.

[0086] Please see Figure 13The guide member 135 can be a flat plate structure, a grooved plate structure, or an arc surface structure with a certain curvature. It only needs to provide a certain guiding and supporting function for the second drag chain 1342 in the suspended state during retraction. The guide member 135 can be connected to the cylinder barrel 1332 of the second telescopic cylinder by means of threaded connection, welding, or riveting.

[0087] In one specific embodiment, please refer to Figure 11 and Figure 12 There is one second cable chain 1342. When the folding cylinder is in its initial state, the second cable chain 1342 is located above the cylinder 1332 of the second telescopic cylinder. This is acceptable. It is understood that when the second boom 130 extends in the opposite direction by more than 180° under the action of the folding cylinder 140, the second cable chain 1342 moves away from the cylinder 1332 of the second telescopic cylinder under gravity. The boom plate of the second telescopic boom 132 provides support for the second cable chain 1342. Therefore, the second cable chain 1342 will not interfere with the extension or retraction of the cylinder 1332 of the second telescopic cylinder.

[0088] Please see Figures 1-6 and Figures 15-17 In another aspect, this application provides a fire truck, which includes a folding boom 100, a chassis, a turntable, and a luffing cylinder 200 as described in any of the above embodiments. The turntable is mounted on the chassis. The tail of the first boom 120 of the folding boom 100 is pivotally connected to the turntable. One end of the luffing cylinder 200 is pivotally connected to the turntable. The other end of the luffing cylinder 200 is pivotally connected to the first boom 120.

[0089] The orientation of the folding boom 100 is changed by a turntable, and the spray height and amplitude of water or foam are changed by the folding boom 100. This enables the fire truck to spray water at high altitudes, improving its firefighting capabilities.

[0090] In one embodiment, please refer to Figures 1-6 There are two luffing cylinders 200. The distance between the two pivot points of the luffing cylinders 200 on the turntable is greater than the distance between the pivot points of the luffing cylinders 200 on the first boom 120. The stability of the folding boom 100 is increased by the oblique support between the two luffing cylinders 200.

[0091] Please see Figure 14 This application also provides a method for deploying a folding boom, applicable to the fire truck in any of the above embodiments. The deployment method includes:

[0092] S100: Extend the folding cylinder and unfold the second boom to a preset first angle in the opposite direction;

[0093] By extending the folding cylinder 140, the second boom 130 is quickly deployed in the reverse direction. The second boom 130 can be deployed in the reverse direction at any angle within the preset first angle range of 0 to 180°, such as 15°, 45°, 60°, 85°, 100°, 125°, 150°, 165°, etc. In other words, the second boom 130 can be deployed to any angle from the space above the first boom 120.

[0094] S200: Extend the second boom to a preset first length.

[0095] In this way, the spraying distance of the delivery pipe on the second boom 130 can be adjusted. The preset first length can be any length between the initial length and the full extension length of the second boom 130. For example, when the preset first length of the second boom 130 is the initial length, the second boom 130 does not actually need to extend, that is, the extension distance is 0.

[0096] The above describes the main combat operating condition of the fire truck provided in this application embodiment. The folding boom deployment method provided in this application embodiment allows for rapid implementation of the main combat operating condition without needing to deploy the first boom 120. In contrast, existing folding boom fire trucks only allow the second boom to deploy in a forward direction relative to the first boom, thus failing to achieve the main combat operating condition of the fire truck.

[0097] It should be noted that the order of S100 and S200 is not limited. For example, S100 can be implemented first, followed by S200. This avoids the inconvenience of extending the second boom 130 due to limited space at lower heights. Alternatively, S200 can be implemented first, followed by S100. All of the above implementation methods can achieve the main combat operation of the fire truck according to the embodiments of this application.

[0098] In one embodiment, the method for deploying the folding boom further includes:

[0099] S300: Extend the luffing cylinder to raise the first boom to the maximum elevation angle;

[0100] This increases the operating range of the folding boom 100 behind the fire truck.

[0101] S400: Extend the first boom to a preset second length.

[0102] The preset second length can be any length between the initial length and the full extension length of the first boom 120. The above describes the small-amplitude high-pressure spraying condition of the fire truck provided in this application embodiment. The small-amplitude high-pressure spraying condition can be quickly achieved through the folding boom unfolding method provided in this application embodiment.

[0103] It should be noted that the order in which S100, S200, S300, and S400 are implemented is not limited. It can be implemented according to the actual needs of the fire scene. For example, step S300 can be implemented first: extending the luffing cylinder 200 and raising the first boom 120 to the maximum elevation angle. Alternatively, step S300 can be implemented after completing lower-height firefighting operations, that is, after implementing steps S100 and S200, to achieve higher-height firefighting. This allows for free switching between main combat mode and low-amplitude high-pressure water jetting mode. The combinations of the implementation order of steps S100, S200, S300, and S400 provided in this application embodiment include, but are not limited to, the order illustrated above. Those skilled in the art can implement these combinations based on the deployment method provided in this application embodiment, and will not be elaborated further here.

[0104] In one embodiment, the method for deploying the folding boom further includes:

[0105] S500: Extend the luffing cylinder and raise the first boom to a preset second angle;

[0106] The preset second angle can be any angle between a preset angle, such as 45°, and the maximum elevation angle, such as 85°.

[0107] S600: Fully extend the first boom;

[0108] S700: Fully extend the second boom.

[0109] The above describes the high-angle spraying configuration of the fire truck provided in this application embodiment. Through the folding boom deployment method provided in this application embodiment, the high-angle spraying configuration is achieved, addressing firefighting needs over a wider area and at higher heights. The preset second angle refers to the pre-set lifting angle of the first boom 120, such as 45°, 50°, 60°, 70°, or 85°. Of course, the above deployment method can be used to deploy the folding boom; the orientation of the folding boom 100 can be changed by rotating the turntable, thereby changing the direction of the sprayed water or foam.

[0110] It should be noted that the order of implementation of steps S100, S200, S300, S400, S500, S600, and S700 is not limited. Depending on the actual needs of the fire scene, step S200 can be implemented by fully extending the second boom, i.e., directly implementing step S700. For example, if the fire point is found to be at a high position, step S400 can be implemented by fully extending the first boom, i.e., implementing step S600. Alternatively, step S500 can be implemented by directly raising the first boom to its maximum elevation angle, i.e., implementing step S300. In other words, the main firefighting mode, small-amplitude high-pressure water jetting mode, and large-amplitude high-pressure water jetting mode can be freely switched. This allows for firefighting needs at different heights and covering different areas. Similarly, the combination of the implementation steps of the above deployment method includes, but is not limited to, the order illustrated above. Those skilled in the art can implement this method based on the deployment method provided in the embodiments of this application, and will not be elaborated further here.

[0111] Those skilled in the art will understand that the lifting angles of the first boom and the second boom can be obtained through sensors. This information is then fed back to the controller, which controls the folding cylinder, the first telescopic cylinder, the second telescopic cylinder, and the luffing cylinder to adjust the working state of the folding boom, thereby switching between main station operation, small-amplitude high-pressure water jetting operation, and large-amplitude high-pressure water jetting operation. It should be noted that other undisclosed structures of the fire truck in this application embodiment are the same as those in the prior art.

[0112] The various embodiments / implementations provided in this application can be combined with each other without creating contradictions. The above descriptions are merely preferred embodiments of this application and are not intended to limit this application. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A folding boom, characterized in that, include: The mounting base includes a first hinge point and a second hinge point spaced apart from the first hinge point; A telescopic first boom, the head of which is fixedly connected to the mounting base; A telescopic second boom, the tail of which is pivotally connected to the first hinge point; A folding hydraulic cylinder, one end of which is pivotally connected to the second boom. When the folding hydraulic cylinder is in its initial state, the second boom is arranged side by side on one side of the width direction of the first boom. A swing arm, one end of which is pivotally connected to the other end of the folding cylinder, and the other end of which is pivotally connected to the second hinge point; as well as A connecting rod, one end of which is pivotally connected to the second boom, and the other end of which is pivotally connected between the two ends of the swing arm; The first boom includes: First basic arm; The first telescopic arm is sleeved inside the first basic arm, and the mounting base is fixedly connected to the head of the first telescopic arm. The first telescopic cylinder is located inside the first telescopic arm. The piston rod of the first telescopic cylinder is fixedly connected to the first basic arm, and the cylinder barrel of the first telescopic cylinder is fixedly connected to the first telescopic arm. The first cable chain assembly includes a first pallet and a first cable chain fixedly connected to one end of the first pallet. The other end of the first pallet is fixedly connected to the first basic arm, and the other end of the first cable chain is fixedly connected to the cylinder of the first telescopic cylinder. A support member, connected to the first pallet and used to support the first pallet, is also supported on the cylinder of the first telescopic cylinder via a sliding pair, the sliding pair being slidable along the outer surface of the cylinder of the first telescopic cylinder; and A support member is mounted on the cylinder of the first telescopic cylinder, and the support member supports the first pallet and is movable relative to the first pallet.

2. The folding boom according to claim 1, characterized in that, When the folding cylinder is in its initial state, the projection of the swing arm along the width direction of the first boom is located within the projection of the first boom.

3. The folding boom according to claim 1, characterized in that, The mounting base includes: A connecting beam, one end of which is fixedly connected to the head of the first boom; and An ear seat is provided at the other end of the connecting beam, and the first hinge point and the second hinge point are respectively located on the ear seat.

4. The folding boom according to any one of claims 1 to 3, characterized in that, The second boom includes: The second basic arm, the tail of which is pivotally connected to the first hinge point, one end of the folding cylinder is pivotally connected to the second basic arm, and one end of the connecting rod is pivotally connected to the second basic arm; The second telescopic arm is fitted inside the second basic arm; The second telescopic cylinder is located inside the second telescopic arm. The piston rod of the second telescopic cylinder is fixedly connected to the second basic arm, and the cylinder barrel of the second telescopic cylinder is fixedly connected to the second telescopic arm. The second cable chain assembly includes a second pallet and a second cable chain fixedly connected to one end of the second pallet, the other end of the second pallet being fixedly connected to the second base arm, and the other end of the second cable chain being fixedly connected to the cylinder of the second telescopic hydraulic cylinder; and The guide member is obliquely installed at one end of the cylinder barrel of the second telescopic cylinder near the piston rod of the second telescopic cylinder, relative to the telescopic direction of the second telescopic cylinder. The height of the end of the guide member near the piston rod of the second telescopic cylinder is lower than that of the end near the cylinder barrel of the second telescopic cylinder.

5. A fire truck, characterized in that, include: Chassis; A turntable is mounted on the chassis; The folding boom according to any one of claims 1 to 4, wherein the tail of the first boom of the folding boom is pivotally connected to the turntable; as well as A luffing cylinder, one end of which is pivotally connected to the turntable, and the other end of which is pivotally connected to the first boom.

6. The fire truck according to claim 5, characterized in that, There are two luffing cylinders, and the distance between the two pivot points of the luffing cylinders on the turntable is greater than the distance between the two pivot points of the luffing cylinders on the first boom.

7. A method for unfolding a folding boom, characterized in that, Applied to the fire truck of claim 5 or 6, the deployment method includes: Extend the folding cylinder and unfold the second boom to a preset first angle in the opposite direction; Extend the second boom to a preset first length.

8. The unfolding method according to claim 7, characterized in that, The unfolding method further includes: Extend the luffing cylinder to raise the first boom to its maximum elevation angle; Extend the first boom to a preset second length.

9. The unfolding method according to claim 7, characterized in that, The unfolding method further includes: Extend the luffing cylinder to raise the first boom to a preset second angle; Fully extend the first boom; Fully extend the second boom.

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