Telescopic boom and telescopic operation machine
By installing a trigger and a thrust assembly between the inner boom section and the drive unit of the telescopic boom, the problem of the lack of sequential retraction in multi-cylinder boom systems is solved, achieving automatic sequential retraction and reducing hydraulic system pressure loss.
Patent Information
- Application Number
- CN202422731509.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-08
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2034-11-08
AI Technical Summary
Existing multi-cylinder boom systems lack sequential retraction functionality, leading to operational difficulties when lifting conditions change and significant pressure loss in the hydraulic system.
A trigger and a thrust assembly are installed between the inner boom section and the drive unit of the telescopic boom. When the inner boom section retracts to its position, it cooperates with the thrust assembly to trigger the retraction action of the lower-level cylinder, thereby realizing the automatic sequential retraction of the telescopic boom. This avoids dependence on the sequence valve and reduces the pressure loss of the hydraulic system.
It enables automatic sequential retraction of the telescopic boom, simplifies the operation process, improves mechanical reliability, and reduces pressure loss in the hydraulic system.
Smart Images
Figure CN223522202U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to engineering machinery technical field, concretely relates to a telescopic arm frame and telescopic operation machinery. BACKGROUND
[0002] When the crane's lifting condition changes from small load to large load, the telescopic arm frame's extended arm sections need to be adjusted again to avoid the end thinner arm section's stress being too large to cause bending and breaking.
[0003] Figure 1 An embodiment of the prior multi-oil-cylinder boom telescoping system is provided, which includes an arm A1, a two-arm A2, a three-arm A3, a four-arm A4, a five-arm A5, which are sequentially sleeved from outside to inside, and a one-oil-cylinder B1, a two-oil-cylinder B2, a three-oil-cylinder B3, a four-oil-cylinder B4 arranged between adjacent arm sections, the one-oil-cylinder B1 drives between the arm A1 and the two-arm A2, the two-oil-cylinder B2 drives between the two-arm A2 and the three-arm A3, and so on. When the boom is extended, hydraulic oil enters the rodless chambers of the one-oil-cylinder B1, the two-oil-cylinder B2, the three-oil-cylinder B3, and the four-oil-cylinder B4 in sequence, while the rod chambers of the one-oil-cylinder B1, the two-oil-cylinder B2, the three-oil-cylinder B3, and the four-oil-cylinder B4 are simultaneously connected to the oil return line, realizing the sequential extension of the boom. However, when the boom needs to be retracted, the rod chambers of the one-oil-cylinder B1, the two-oil-cylinder B2, the three-oil-cylinder B3, and the four-oil-cylinder B4 will simultaneously enter the oil, causing the boom to retract in disorder.
[0004] For the multi-oil-cylinder boom telescoping system, although a sequence valve can be arranged between the rod chambers of multiple oil cylinders to realize the sequential retraction function of the boom, the arrangement of the sequence valve will cause a large pressure loss of the pressure oil. Therefore, in the prior art, a sequence valve is generally not arranged between multiple oil cylinders, which results in the lack of sequential retraction function of this type of boom system. When the lifting condition changes, this type of telescopic boom can only be fully retracted first, and then controlled to extend to the target number of sections in sequence, which is very troublesome to operate. UTILITY MODEL CONTENTS
[0005] In view of the above defects or deficiencies, the utility model provides a telescopic arm frame and telescopic operation machinery, aiming to solve the technical problem of the lack of sequential retraction function of the prior multi-oil-cylinder boom.
[0006] To achieve the above purpose, the utility model provides a telescopic arm frame, which includes at least three arm sections and a telescopic driving mechanism, any adjacent three arm sections constitute an outer arm section, an intermediate arm section, and an inner arm section, and the telescopic driving mechanism includes a first driving member arranged between the outer arm section and the intermediate arm section, wherein one of the inner arm section and the first driving member is provided with a thrust assembly, and the other is provided with a trigger, the trigger is used to cooperate with the thrust assembly to trigger when the inner arm section is retracted in place, so as to control the first driving member to perform the retraction driving action.
[0007] In the embodiment of the utility model, the head of inner arm section is equipped with limiting mounting seat, the limiting mounting seat is equipped with mounting hole extending along the length direction of inner arm section, the thrust component includes thrust rod passing in the mounting hole, the thrust rod is fixed in the mounting hole through locking structure.
[0008] In the embodiment of the utility model, the thrust component further includes thrust baffle arranged at one end of the tail end of the thrust rod towards the inner arm section.
[0009] In the embodiment of the utility model, the first reinforcing plate is arranged between the thrust baffle and the thrust rod.
[0010] In the embodiment of the utility model, the thrust rod is screw rod, and the locking structure is nut sleeved on the thrust rod.
[0011] In the embodiment of the utility model, the mounting hole is screw hole.
[0012] In the embodiment of the utility model, the limiting mounting seat includes vertical plate and mounting column arranged on the vertical plate, the mounting column extends along the length direction of the inner arm section and is equipped with mounting hole.
[0013] In the embodiment of the utility model, the second reinforcing plate is further arranged between the vertical plate and the inner arm section.
[0014] In the embodiment of the utility model, the lower oil cylinder is provided with a rodless cavity one-way oil inlet channel and an independent channel for discharging oil from the rodless cavity, or the lower oil cylinder is provided with a rod cavity one-way oil discharge channel and an independent channel for oil inlet of the rod cavity, the independent channel is provided with a control valve for controlling on-off, the trigger is a valve core of the control valve, and the valve core of the control valve is used for being in contact with the thrust component when the inner arm section is retracted in place to control the independent channel to be conducted.
[0015] In the embodiment of the utility model, the lower oil cylinder includes a cylinder barrel and a piston rod, the cylinder barrel is installed on the outer arm section, the rod head of the piston rod extends from the cylinder barrel and is installed on the head of the intermediate arm section, the rod cavity one-way oil discharge channel is arranged on the cylinder barrel, the independent channel is arranged in the rod body of the piston rod and is communicated with the rod cavity of the lower oil cylinder through the oil inlet and outlet hole of the rod cavity at one end, the other end of the independent channel extends to the rod head of the piston rod, and the control valve is arranged on the rod head of the piston rod and is used for controlling the on-off of the independent channel in the rod body.
[0016] To achieve the above object, the utility model also provides a telescopic operation machine, wherein the telescopic operation machine includes the telescopic jib according to the above.
[0017] Through the above technical scheme, the telescopic jib provided by the utility model embodiment has the following beneficial effects:
[0018] The telescopic arm frame in the utility model is provided with a trigger and a thrust assembly between the first driving part and the inner arm section, and the trigger is arranged to cooperate with the thrust assembly to trigger when the inner arm section is retracted in place, so that the lower oil cylinder can only perform a retracting action to drive the middle arm section to retract when the inner arm section is retracted in place, and automatic sequential retraction of the telescopic arm frame is realized.
[0019] Other features and advantages of the utility model will be described in detail in the following specific embodiment part. BRIEF DESCRIPTION OF DRAWINGS
[0020] The accompanying drawings are included to provide a further understanding of the utility model, and constitute a part of the specification, and are used to explain the utility model together with the following specific embodiment, but do not constitute the limitation to the utility model. In the drawings:
[0021] Figure 1 It is the principle diagram of the existing multi-oil cylinder boom telescopic system;
[0022] Figure 2 It is the structure schematic view of the telescopic arm frame in the utility model embodiment;
[0023] Figure 3 It is the structure schematic view of the inner arm section in the utility model embodiment;
[0024] Figure 4 It is the structure schematic view of the thrust assembly in the utility model embodiment;
[0025] Figure 5 It is the overall structure schematic view of the lower oil cylinder in the utility model embodiment;
[0026] Figure 6 It is the principle view of the first kind of implementation of the lower oil cylinder with the rodless cavity one-way oil inlet channel and the independent channel for discharging oil of the rodless cavity in the utility model embodiment;
[0027] Figure 7 It is the principle view of the second kind of implementation of the lower oil cylinder with the rodless cavity one-way oil inlet channel and the independent channel for discharging oil of the rodless cavity in the utility model embodiment;
[0028] Figure 8 It is the principle view of one kind of implementation of the lower oil cylinder with the rod cavity one-way discharge channel and the independent channel for oil inlet of the rod cavity in the utility model embodiment;
[0029] Figure 9is a structural schematic view according to one of the embodiments of the lower oil cylinder provided with the rod cavity one-way oil leakage channel and the independent channel for rod cavity oil inlet.
[0030] Reference signs
[0031] 11, outer arm section; 12, intermediate arm section; 13, inner arm section; 14, thrust assembly; 141, thrust rod; 142, thrust stop; 143, first reinforcing plate; 15, limit mounting seat; 151, vertical plate; 152, mounting column; 153, second reinforcing plate; 21, lower oil cylinder; 22, rodless cavity one-way oil inlet channel; 23, independent channel; 24, rod cavity one-way oil leakage channel; 25, control valve; 251, valve core; 26, rod cavity oil inlet and outlet hole; 27, rodless cavity working oil port; 28, rod cavity working oil port; 29, built-in pipeline; 3, one-way valve. DETAILED DESCRIPTION
[0032] The specific embodiments of the utility model are described in detail below in combination with the drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model.
[0033] The telescopic boom of the utility model is described below with reference to the drawings.
[0034] As Figure 2 shown, the utility model provides a telescopic boom, wherein the telescopic boom comprises at least three arm sections and a telescopic driving mechanism.
[0035] Any adjacent three arm sections form the outer arm section 11, the intermediate arm section 12 and the inner arm section 13, and the inner arm section 13 is provided with the thrust assembly 14. For example, the three arm sections comprise a first arm, a second arm and a third arm which are sequentially sleeved from outside to inside, and the first arm, the second arm and the third arm can form the outer arm section 11, the intermediate arm section 12 and the inner arm section 13. For another example, the four arm sections comprise a first arm, a second arm, a third arm and a fourth arm which are sequentially sleeved from outside to inside, and the second arm, the third arm and the fourth arm can form the outer arm section 11, the intermediate arm section 12 and the inner arm section 13.
[0036] The telescopic driving mechanism is used for driving the corresponding arm sections to extend respectively. The telescopic driving mechanism can be a screw rod motor transmission, or can be a gas pressure or hydraulic transmission.
[0037] Next, the embodiments of the utility model are described taking the hydraulic transmission as an example.
[0038] The multi-stage oil cylinder can include a lower-stage oil cylinder 21 arranged between the outer arm section 11 and the intermediate arm section 12, i.e., the first driving member is the lower-stage oil cylinder 21, and the lower-stage oil cylinder 21 can drive the intermediate arm section 12 to extend relative to the outer arm section 11. The multi-stage oil cylinder can further include an upper-stage oil cylinder arranged between the intermediate arm section 12 and the inner arm section 13, and the upper-stage oil cylinder can drive the inner arm section 13 to extend relative to the intermediate arm section 12.
[0039] The lower-stage oil cylinder 21 is provided with a trigger, and the trigger is used to trigger the thrust assembly 14 when the inner arm section 13 is retracted to a position, so as to control the retraction of the lower-stage oil cylinder 21.
[0040] In the telescopic boom of the utility model, the trigger is arranged on the lower-stage oil cylinder 21, the thrust assembly is arranged on the inner arm section, and the trigger is arranged to trigger the thrust assembly 14 when the inner arm section 13 is retracted to a position, so that the lower-stage oil cylinder 21 can only perform the retraction action to drive the intermediate arm section 12 to retract when the inner arm section 13 is retracted to the position, and the automatic sequential retraction of the telescopic boom is realized. Moreover, the utility model can be free from the dependence on the sequence valve, and the pressure loss of the hydraulic system is reduced.
[0041] It can be understood that there are many ways to trigger the trigger to realize the retraction control of the lower-stage oil cylinder 21, such as electric control type triggering and mechanical linkage type triggering.
[0042] Taking the electric control type triggering as an example, the trigger can be a travel switch, a distance sensing element, a magnetic induction element, etc. When the inner arm section 13 is retracted to a position, the travel switch or the distance sensing element senses the thrust assembly 14 and sends a retraction control signal, and a controller controls the corresponding valve in the hydraulic oil circuit of the lower-stage oil cylinder according to the retraction control signal, so as to realize the sequential retraction control of the lower-stage oil cylinder.
[0043] Taking the mechanical linkage type triggering as an example, the trigger can be a reversing control valve or a travel valve arranged on the working oil circuit of the lower-stage oil cylinder 21. The reversing control valve or the travel valve can be contacted and pushed by the thrust assembly 14 when the inner arm section 13 is retracted to a position, so as to realize the sequential retraction control of the lower-stage oil cylinder.
[0044] In the embodiment of the mechanical linkage type triggering, on the basis of the sequential retraction control of the lower-stage oil cylinder, in order to increase the integration of the lower-stage oil cylinder, as shown in Figure 6 and Figure 7 , the lower-stage oil cylinder 21 can be provided with a rodless cavity one-way oil inlet channel 22 and an independent channel 23 for discharging oil from the rodless cavity, or as shown in Figure 8 and Figure 9 , the lower-stage oil cylinder 21 can be provided with a rodless cavity one-way oil inlet channel 22 and a rodless cavity one-way oil outlet channel 24.As shown, the lower oil cylinder 21 can be provided with a rod cavity one-way oil discharge channel 24 and an independent channel 23 for rod cavity oil inlet. The independent channel 23 is provided with a control valve 25 for controlling the on-off state, and the valve core 251 of the control valve 25 is used to contact the thrust assembly 14 when the inner arm section 13 is retracted to the position, so as to control the independent channel 23 to be in a conductive state.
[0045] The following lower oil cylinder 21 is provided with a rod cavity one-way oil discharge channel 24 and an independent channel 23 for rod cavity oil inlet. As shown in Figure 6 and Figure 7 The rod cavity of the oil cylinder is filled with oil through the rod cavity one-way oil discharge channel 24, and is discharged through the independent channel 23, and the rod cavity is filled with oil and discharged through the rod cavity working oil port 28.
[0046] When the lower oil cylinder 21 needs to be extended, the hydraulic oil of the rod cavity working oil port 27 can enter the rod cavity of the lower oil cylinder 21 through the rod cavity one-way oil discharge channel 22, and the rod cavity of the lower oil cylinder 21 can be discharged through the rod cavity working oil port 28.
[0047] During the retraction of the telescopic boom, since the rod cavity one-way oil discharge channel 22 can only be filled with oil in one direction, and the independent channel 23 is in a closed state by nature, the rod cavity of the lower oil cylinder 21 cannot be discharged before the valve core 251 of the control valve 25 is triggered, and the lower oil cylinder 21 remains in a static state. When the inner arm section 13 is retracted to the position, the thrust assembly 14 on the inner arm section 13 will contact the valve core 251 of the control valve 25 and push the valve core 251 to displace, so that the independent channel 23 is in a conductive state. At this time, the rod cavity of the lower oil cylinder 21 is filled with oil through the rod cavity working oil port 28, the rod cavity of the lower oil cylinder 21 is discharged through the independent channel 23, and the lower oil cylinder 21 performs a retraction action.
[0048] The following lower oil cylinder 21 is provided with a rod cavity one-way oil discharge channel 24 and an independent channel 23 for rod cavity oil inlet. As shown in
[0049] As shown in Figure 8 and Figure 9 The rod cavity of the oil cylinder is filled with oil through the rod cavity one-way oil discharge channel 24, and is discharged through the independent channel 23, and the rod cavity is filled with oil and discharged through the rod cavity working oil port 28.
[0050] When the lower oil cylinder 21 needs to be extended, the hydraulic oil can enter the rod cavity of the lower oil cylinder 21 through the rod cavity working oil port 27, and the rod cavity of the lower oil cylinder 21 will be discharged through the rod cavity one-way oil discharge channel 24 due to the closed state of the independent channel 23.
[0051] In the process of retracting the telescopic boom, the retraction of the intermediate arm section 12 is realized by the rod cavity of the lower oil cylinder 21, and before the control valve 25 is triggered, the independent channel 23 of the rod cavity is in a closed state, and the one-way discharge channel 24 of the rod cavity can only be one-way, so the lower oil cylinder 21 cannot perform the retraction action. When the inner arm section 13 is retracted to the position, the valve core 251 of the control valve 25 is triggered by the thrust assembly 14, at this time, the independent channel 23 of the rod cavity is connected, the rod cavity of the lower oil cylinder 21 is normally supplied with oil through the independent channel 23, and the lower oil cylinder 21 performs the retraction action.
[0052] In summary, in the telescopic boom, the lower oil cylinder 21 is provided with a rodless cavity one-way oil inlet channel 22 and an independent channel 23 for discharging the rodless cavity, or a rod cavity one-way discharge channel 24 and an independent channel 23 for supplying oil to the rod cavity, and a control valve 25 is arranged on the independent channel 23. The valve core 251 of the control valve 25 is mechanically triggered and linked when the inner arm section 13 is retracted to the position, so that only when the inner arm section 13 is retracted to the position, the lower oil cylinder 21 can perform the retraction action to drive the intermediate arm section 12 to retract, and the telescopic boom realizes the sequential retraction. The telescopic boom in the utility model realizes the sequential retraction through mechanical structure triggering, which not only has simple structure and strong implementability, but also can be free from the dependence on electric control and has higher mechanical reliability.
[0053] As shown in Figure 3 , Figure 4 and Figure 5 , in the embodiment of the utility model, the head of the inner arm section 13 is provided with a limiting mounting seat 15, the limiting mounting seat 15 is provided with a mounting hole extending along the length direction of the inner arm section 13, the thrust assembly 14 comprises a thrust rod 141 penetrating in the mounting hole, and the thrust rod 141 is fixed in the mounting hole through locking structure. The head of the inner arm section 13 refers to the part exposed on the head of the intermediate arm section 12 when the inner arm section 13 is completely retracted. Through the cooperation of the thrust rod 141 and the mounting hole, the installation position of the thrust rod 141 in the length direction of the telescopic boom can be adjusted, so as to compensate the triggering error of the thrust assembly 14 and the valve core 251 in the length direction of the telescopic boom.
[0054] As shown in Figure 3 , Figure 4 and Figure 5 , in the embodiment of the utility model, the thrust assembly 14 further comprises a thrust baffle 142 arranged at one end of the thrust rod 141 towards the tail end of the inner arm section 13. The thrust baffle 142 can increase the triggering range of the thrust assembly 14, so that when the limiting mounting seat 15 causes the thrust rod 141 and the valve core 251 to be staggered due to installation error, the valve core 251 can also be triggered smoothly.
[0055] As shown in Figure 4As shown, in an embodiment of this utility model, the thrust baffle 142 can be welded to the end of the thrust rod 141, and a first reinforcing plate 143 can be provided between the thrust baffle 142 and the thrust rod 141. By providing the first reinforcing plate 143, the firmness of the connection between the thrust baffle 142 and the thrust rod 141 can be increased.
[0056] In embodiments of this utility model, the thrust rod 141 can be a screw, and the locking structure can be a nut sleeved on the thrust rod 141. The nut allows the thrust rod 141 to be locked at any position along the length of the telescopic boom. Alternatively, the thrust rod 141 may also have locking holes spaced apart along its length, and the locking structure can be a locking pin that engages with the locking holes.
[0057] In an embodiment of this utility model, if the thrust rod 141 is a screw, the mounting hole can be a threaded hole. In this case, only one nut is needed to lock the thrust rod 141 in any position.
[0058] like Figure 3 As shown, in an embodiment of this utility model, the limiting mounting base 15 includes a vertical plate 151 and a mounting post 152 disposed on the vertical plate 151. The mounting post 152 extends along the length direction of the inner arm section 13 and is provided with a mounting hole. By providing the mounting post 152, the length of the mounting hole can be increased, thereby increasing the load-bearing stability of the mounting hole.
[0059] like Figure 3 As shown, in an embodiment of this utility model, a second reinforcing plate 153 is also provided between the upright plate 151 and the inner arm section 13. By providing the second reinforcing plate 153, the structural strength of the upright plate 151 can be increased, preventing the deformation of the upright plate 151 from causing misalignment between the valve core 251 and the thrust baffle 142.
[0060] To further explain the triggering principle of the control valve 25, this utility model provides a specific structure of a lower-stage cylinder 21 with a one-way oil drain channel 24 for the rod chamber and an independent channel 23 for oil inlet for the rod chamber.
[0061] like Figure 9As shown, the oil cylinder includes a cylinder barrel for mounting on the outer arm section 11 and a piston rod, the rod head of which extends out of the cylinder barrel and is used for mounting on the head of the intermediate arm section 12, and a control valve 25 is arranged on the rod head of the piston rod to facilitate the contact of the valve core 251 with the thrust assembly 14. The cylinder barrel is provided with a rod cavity working oil port 28 and a rodless cavity working oil port 27 for realizing the oil in and out of the rod cavity and the rodless cavity, and is also provided with a rod cavity one-way oil discharge channel 24, which is connected with the rod cavity working oil port 28 through a one-way valve 3, and an independent channel 23 is arranged in the rod body of the piston rod, one end of the independent channel 23 can be communicated with the rod cavity working oil port 28 through a guide pipe arranged on the cylinder barrel and extending into the independent channel 23 and in sliding fit with the independent channel 23, and the other end of the independent channel 23 is connected with the inlet of the control valve 25, and as an alternative, the independent channel 23 can also be arranged on the outer side of the cylinder body. Figure 8 As shown, the independent channel 23 is arranged on the outer side of the cylinder body. The outlet of the control valve 25 can be communicated with the rod cavity of the lower oil cylinder 21 through the built-in pipe 29, the rod cavity oil inlet and outlet hole 26, or also through an external pipe.
[0062] When the valve core 251 of the control valve 25 is triggered, the pressure oil of the rod cavity working oil port 28 will enter the rod cavity of the lower oil cylinder 21 through the guide pipe, the independent channel 23, the control valve 25, the built-in pipe 29, and the rod cavity oil inlet and outlet hole 26, to realize the retraction drive of the lower oil cylinder 21. The specific working principle of the oil cylinder is described in the patent with application number 202511425174.0, which will not be repeated here.
[0063] As shown, for the lower oil cylinder 21 provided with the rodless cavity one-way oil inlet channel 22 and the independent channel 23 for discharging oil from the rodless cavity, the independent channel 23 can be integrated in the rod body of the piston rod, or as shown, the part of the independent channel 23 from the control valve 25 to the rodless cavity working oil port 27 can be connected through an external pipe. Figure 7 Figure 6 As shown, the independent channel 23 is arranged on the outer side of the cylinder body. The outlet of the control valve 25 can be communicated with the rod cavity of the lower oil cylinder 21 through the built-in pipe 29, the rod cavity oil inlet and outlet hole 26, or also through an external pipe.
[0064] To achieve the above purpose, the utility model also provides a telescopic operation machine, wherein the telescopic operation machine comprises the telescopic arm support according to the above, since the telescopic arm support adopts all the technical solutions of the above embodiments, at least has the beneficial effects brought by the above embodiments, which will not be repeated here.
[0065] In the description of the utility model, need understanding is, the term "first", "second" only for the purpose of description, and can not be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one feature. In the description of the utility model, the meaning of "a plurality of" is at least two, for example two, three, etc. Unless otherwise specifically limited.
[0066] In the utility model, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; It can be mechanical connection, or electrical connection or communication with each other; It can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements or the interaction between two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0067] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of different embodiments or examples without contradiction.
[0068] Although the embodiments of the utility model have been described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the utility model, and the skilled in the art can change, modify, replace and modify the above embodiments within the scope of the utility model.
Claims
1. A telescopic boom, characterized in that, The telescopic arm support comprises: at least three arm sections, any adjacent three of which form an outer arm section (11), a middle arm section (12) and an inner arm section (13); a telescopic driving mechanism comprising a first driving member arranged between the outer arm section (11) and the middle arm section (12); wherein one of the inner arm section (13) and the first driving member is provided with a thrust assembly (14), and the other is provided with a trigger member, the trigger member being configured to cooperate with the thrust assembly (14) to trigger when the inner arm section (13) is retracted in place, so as to control the first driving member to perform a retraction driving action.
2. A telescopic boom as claimed in claim 1, characterised in that, The head of the inner arm section (13) is provided with a limiting mounting seat (15), the limiting mounting seat (15) is provided with a mounting hole extending along the length direction of the inner arm section (13), the thrust assembly (14) is arranged on the inner arm section (13) and comprises a thrust rod (141) penetrating through the mounting hole, and the thrust rod (141) is fixed in the mounting hole through a locking structure.
3. A telescopic boom as claimed in claim 2, characterised in that, The thrust assembly (14) further comprises a thrust stop plate (142) arranged at the end of the thrust rod (141).
4. A telescopic boom as claimed in claim 3, characterised in that, A first reinforcing plate (143) is arranged between the thrust stop plate (142) and the thrust rod (141).
5. The telescoping boom of claim 2, wherein, The thrust rod (141) is a screw rod, and the locking structure is a nut sleeved on the thrust rod (141).
6. A telescopic boom as claimed in claim 5, characterised in that, The mounting hole is a threaded hole.
7. The telescoping boom of claim 2, wherein, The limiting mounting seat (15) comprises a vertical plate (151) and a mounting column (152) arranged on the vertical plate (151), the mounting column (152) extends along the length direction of the inner arm section (13) and is provided with the mounting hole.
8. A telescopic boom as claimed in any one of claims 1 to 7, wherein, The telescopic driving mechanism is a multi-stage oil cylinder, the first driving member is a lower-stage oil cylinder (21), the lower-stage oil cylinder (21) is provided with a rodless cavity one-way oil inlet channel (22) and an independent channel (23) for discharging oil from the rodless cavity, or the lower-stage oil cylinder (21) is provided with a rod cavity one-way oil discharge channel (24) and an independent channel (23) for oil inlet of the rod cavity, the independent channel (23) is provided with a control valve (25) for controlling the on-off, and the trigger member is a valve core (251) of the control valve (25), the valve core (251) of the control valve (25) is configured to contact the thrust assembly (14) when the inner arm section (13) is retracted in place, so as to control the independent channel (23) to be conductive.
9. A telescopic boom as claimed in claim 8, characterised in that, The lower oil cylinder (21) is provided with a rod cavity one-way oil discharge channel (24) and an independent channel (23) for rod cavity oil inlet, the lower oil cylinder (21) comprises a cylinder barrel and a piston rod, the cylinder barrel is installed on the outer arm section (11), the piston rod head extends from the cylinder barrel and is installed on the head of the intermediate arm section (12), the rod cavity one-way oil discharge channel (24) is arranged on the cylinder barrel, the independent channel (23) is arranged in the rod body of the piston rod and one end communicates with the rod cavity of the lower oil cylinder (21) through a rod cavity oil inlet and outlet hole (26), the other end of the independent channel (23) extends to the rod head of the piston rod and is connected with the control valve (25), the control valve (25) is arranged on the rod head of the piston rod and is used for controlling the on-off of the independent channel (23) in the rod body.
10. A telescoping work machine characterized by, The telescopic boom includes the telescopic boom according to any one of claims 1 to 9.