Pipeline built-in telescopic device and engineering machinery

Abstract

The application belongs to the technical field of lifting equipment and provides a pipeline built-in telescopic device and engineering machinery, the pipeline built-in telescopic device comprises a telescopic arm support, a tensioning mechanism and a pipeline mechanism, the telescopic arm support comprises a first section arm, a second section arm and a third section arm, the tail end of the second section arm is provided with a mounting seat, the mounting seat is provided with a threaded hole, the tensioning mechanism comprises a tensioning screw rod and a tensioning wheel, the tensioning screw rod is screwed into the threaded hole and can move in the front-back direction, the tensioning wheel is arranged on the tensioning screw rod, the pipeline mechanism comprises a first pipeline section laid between the first section arm and the second section arm, the head end of the first pipeline section is fixed on the front end of the first section arm, the tail end of the first pipeline section is turned to pass around the tensioning wheel and is fixed on the third section arm. The first pipeline section is tensioned by adjusting the tensioning mechanism, so as to overcome the influence of the telescopic arm support on the first pipeline section during telescoping, at the same time, the first pipeline section is a common pipeline, which is not only convenient to install, but also has a lower price.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of lifting equipment, and particularly relates to a pipeline built-in telescopic device and engineering machinery. BACKGROUND

[0002] The drag chain device is a device commonly used for laying hydraulic pipelines and cables on the boom of a high-altitude vehicle or a fork loader. Its main function is to pull and protect the pipeline components such as hydraulic pipelines and cables on the boom to avoid the pipelines being pulled or damaged when the boom is telescoped. According to the positional relationship between the drag chain and the boom, the drag chain can be generally divided into an external drag chain and an internal drag chain. The external drag chain is widely used because it is simple in structure and easy to maintain. However, the external drag chain affects the appearance of the equipment to some extent and is easily disturbed by the external environment. Therefore, more and more users hope to lay the drag chain inside the boom. However, the space inside the boom is limited, and the volume of the drag chain device is large. If the drag chain is installed in the telescopic boom, the structure inside the telescopic boom will be compact and complex, which is not conducive to installation and maintenance. SUMMARY

[0003] In view of the above defects or deficiencies, the present application provides a pipeline built-in telescopic device and engineering machinery, aiming to solve the technical problems of the compact and complex internal structure of the telescopic boom with the built-in drag chain, and the difficulty in installation and maintenance.

[0004] To achieve the above-mentioned purpose, the present application provides a pipeline built-in telescopic device, which comprises a telescopic boom, a tensioning mechanism and a pipeline mechanism. The telescopic boom comprises a first arm, a second arm and a third arm which are sequentially sleeved from outside to inside. The tail end of the second arm is provided with a mounting seat, and the mounting seat is provided with a threaded hole. The tensioning mechanism comprises a tensioning screw and a tensioning wheel. The tensioning screw is screwed into the threaded hole and can move in the front-rear direction. The tensioning wheel is rotationally connected to the tensioning screw through a connecting assembly and can move with the tensioning screw. The pivot axis direction of the tensioning wheel is perpendicular to the front-rear direction. The pipeline mechanism comprises a first pipeline segment laid in the gap between the first arm and the second arm. The head end of the first pipeline segment is fixed to the front end of the first arm. The tail end of the first pipeline segment is turned around the tensioning wheel and fixed to the third arm.

[0005] In the embodiment of the present application, the connecting assembly comprises a connecting pin and a locking nut. The end of the connecting pin is sleeved on the tensioning screw and locked and fixed by the locking nut. The tensioning wheel is pivoted to the connecting pin.

[0006] In the embodiment of the present application, the number of mounting seats and tensioning screws is two. The mounting seats are spaced apart and arranged in parallel on both sides of the tail end of the second arm. The two tensioning screws are correspondingly screwed into the two mounting seats. The two ends of the connecting pin are correspondingly sleeved on the two tensioning screws. The tensioning wheel is pivoted to the connecting pin and located between the two tensioning screws.

[0007] In the embodiment of the present application, the pipeline mechanism comprises a plurality of conveying pipes, the outer peripheral wall of the tensioning wheel is provided with a plurality of roller grooves, and the first pipeline segments of the plurality of conveying pipes are wound one by one with the plurality of roller grooves.

[0008] In the embodiment of the present application, the tensioning mechanism further comprises two mounting plates sleeved on the connecting pin and arranged at two ends of the tensioning wheel, and a rope blocking rod connecting the two mounting plates, the rope blocking rod is arranged at intervals with the groove openings of the roller grooves, and the gap distance between the rope blocking rod and the groove openings of the roller grooves is smaller than the thickness of the first pipeline segment.

[0009] In the embodiment of the present application, the end portion of the connecting pin is polygonal in contour, and the sleeving hole of the mounting plate for sleeving the connecting pin is a polygonal hole, and the mounting plate is relatively fixedly sleeved on the connecting pin.

[0010] In the embodiment of the present application, the telescopic arm frame further comprises a fourth section arm, the fourth section arm is sleeved in the third section arm, the third section arm is provided with a pipeline bracket, one end of the pipeline bracket is fixed at the tail of the third section arm, the other end of the pipeline bracket extends into the fourth section arm and slidably abuts against the inner wall of the fourth section arm, and the pipeline mechanism further comprises a second pipeline segment reversely stacked on the pipeline bracket, two ends of the second pipeline segment are connected with the tail end of the first pipeline segment and the fourth section arm respectively, wherein the folded second pipeline segment is straightened in a forward direction when the telescopic arm frame reaches the maximum extension amount.

[0011] In the embodiment of the present application, the second pipeline segment comprises a fixed segment and a folded segment, the pipeline bracket comprises a fixed part and a supporting part, a wire passing hole is arranged between the fixed part and the supporting part, the fixed segment is fixedly arranged at the bottom of the fixed part by a fastener, and the folded segment passes through the wire passing hole and is folded and arranged on the fixed part when the telescopic arm frame is in the maximum contraction state, or is arranged on the supporting part when the telescopic arm frame is in the maximum extension state.

[0012] In the embodiment of the present application, the fixed part and the supporting part are provided with U-shaped grooves which are open at the upper end, and the folded segment can fall into the U-shaped grooves of the fixed part or the supporting part.

[0013] In the embodiment of the present application, the U-shaped groove of the fixed part is a single-layer U-shaped groove, and the U-shaped groove of the supporting part is a double-layer U-shaped groove, and the upper layer bottom wall of the double-layer U-shaped groove is higher than the bottom wall of the single-layer U-shaped groove.

[0014] In the embodiment of the present application, the tail end of the second pipeline segment is fixed at the tail of the fourth section arm, and the pipeline mechanism further comprises a third pipeline segment laid in the fourth section arm and extending from the tail end of the fourth section arm to the hand segment of the fourth section arm, one end of the third pipeline segment is connected with the tail end of the second pipeline segment.

[0015] In the embodiment of the present application, the telescopic arm is a three-section arm, and the pipeline mechanism further comprises a fourth pipeline section laid in the third section arm and extending from the tail end of the third section arm to the head end of the third section arm, one end of the fourth pipeline section being connected with the tail end of the first pipeline section.

[0016] To achieve the above object, the present application further provides an engineering machine, wherein the engineering machine comprises the pipeline built-in telescopic device according to the above description.

[0017] Through the above technical solution, the pipeline built-in telescopic device provided by the embodiment of the present application has the following beneficial effects:

[0018] Since the first pipeline section is wound on the tensioning wheel and the two ends are fixed with the head end of the first section arm and the tail end of the third section arm respectively, and the tensioning mechanism is arranged at the tail end of the second section arm, the tightness of the first pipeline section can be adjusted by adjusting the screwing depth of the tensioning screw in the mounting seat at the tail end of the telescopic arm without disassembling the arm, so as to tighten the first pipeline section, and after the first pipeline section is tightened, due to the synchronous telescoping characteristics of the telescopic arm, the distance between the head end of the first pipeline section and the tensioning wheel decreases by an amount equal to the increase of the distance between the tail end of the first pipeline section and the tensioning wheel during the elongation of the first section arm, the second section arm and the third section arm, that is, the first pipeline section is always in a tightened state during the telescoping of the first section arm, the second section arm and the third section arm, so that the first pipeline section can be prevented from being damaged or squeezed during the telescoping of the telescopic arm, and the working condition of the first pipeline section is ensured. In addition, the first pipeline section is a common pipeline, which has a smaller volume and a lower price than a drag chain. In summary, the pipeline built-in telescopic device in the present application can overcome the influence of the telescopic arm on the first pipeline section during telescoping by laying the first pipeline section in the gap between the first section arm and the second section arm and fixing the two ends on the first section arm and the third section arm respectively, and adjusting the tightness of the first pipeline section by the tensioning mechanism, so as to ensure the working condition of the first pipeline section. In addition, the first pipeline section is a common pipeline, which has a small volume, is easy to install and has a lower price.

[0019] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings are included to provide a further understanding of the present application, constitute a part of the specification and are used together with the following specific embodiments to explain the present application, but do not constitute a limitation on the present application. In the drawings:

[0021] Figure 1 is a structural schematic view of the pipeline built-in telescopic device according to the four-section arm structure in the embodiment of the present application;

[0022] Figure 2is a structural schematic view of the tensioning device installed in the telescopic arm support according to the embodiment of the present application;

[0023] Figure 3 is a structural schematic view of the pipeline bracket according to the embodiment of the present application;

[0024] Figure 4 is a structural schematic view of the telescopic device according to the embodiment of the present application Figure 3 is a sectional schematic view at A-A in FIG. 1;

[0025] Figure 5 is a structural schematic view of the slider of the pipeline bracket in the telescopic arm support according to the embodiment of the present application;

[0026] Figure 6 is a structural schematic view of the pipeline built-in telescopic device of the three-section arm structure according to the embodiment of the present application;

[0027] Figure 7 is a structural schematic view of the pipeline built-in telescopic device of the four-section arm structure according to the embodiment of the present application when the pipeline built-in telescopic device is extended.

[0028] Explanation of reference signs

[0029] DETAILED DESCRIPTION

[0030] The specific embodiments of the present application are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present application, and are not intended to limit the present application.

[0031] The pipeline built-in telescopic device of the present application is described below with reference to the accompanying drawings.

[0032] The present application provides a pipeline built-in telescopic device, as shown in FIGS. 1, Figure 1 , Figure 2 and Figure 6 , wherein the pipeline built-in telescopic device comprises:

[0033] a telescopic arm support 1 comprising a first section arm 11, a second section arm 12 and a third section arm 13 which are sequentially sleeved from outside to inside, a tail end of the second section arm 12 is provided with a mounting seat 121, and the mounting seat 121 is provided with a threaded hole;

[0034] a tensioning mechanism 2 comprising a tensioning wheel 21 and a tensioning screw 22, the tensioning screw 22 is screwed into the threaded hole and can move in a front-rear direction, the tensioning wheel 21 is rotationally connected to the tensioning screw 22 through a connecting assembly and can move with the tensioning screw 22, and a pivoting axis direction of the tensioning wheel 21 is perpendicular to the front-rear direction; and

[0035] The pipeline mechanism comprises a first pipeline segment 31 laid in the gap between the first arm section 11 and the second arm section 12, the leading end of the first pipeline segment 31 is fixed to the front end of the first arm section 11, and the trailing end of the first pipeline segment 31 is turned around the tensioning wheel 21 and fixed to the third arm section 13.

[0036] The pipeline built-in telescopic device provided by the application mainly embeds the pipeline mechanism in the telescopic arm support 1 and can eliminate the influence of the telescopic arm support 1 on the pipeline mechanism, in the first pipeline segment 31 of the pipeline mechanism, the first pipeline segment 31 is wound around the tensioning wheel 21 and the two ends are fixed to the front end of the first arm section 11 and the trailing end of the third arm section 13 respectively, and the tensioning mechanism 2 is arranged at the trailing end of the second arm section 12, so that the tightness of the first pipeline segment 31 can be adjusted by rotating the tensioning screw 22 at the trailing end of the telescopic arm support 1 without disassembling the arm, and after the first pipeline segment 31 is tightened, due to the synchronous telescopic characteristics of the telescopic arm support 1, the distance between the leading end of the first pipeline segment 31 and the tensioning wheel 21 decreases by an amount equal to the increase of the distance between the trailing end of the first pipeline segment 31 and the tensioning wheel 21 during the extension of the first arm section 11, the second arm section 12 and the third arm section 13, that is, the first pipeline segment 31 is always in a tightened state during the telescoping of the first arm section 11, the second arm section 12 and the third arm section 13, so that the first pipeline segment 31 can be prevented from being damaged or squeezed during the telescoping of the telescopic arm support 1, and the working condition of the first pipeline segment 31 is ensured, and secondly, the first pipeline segment 31 of the application is a common pipeline, which has a smaller volume, a lower price, and is more convenient to install and maintain than a drag chain, and in summary, the pipeline built-in telescopic device in the application can overcome the influence of the telescopic arm support 1 on the first pipeline segment 31 during the telescoping by laying the first pipeline segment 31 in the gap between the first arm section 11 and the second arm section 12 and fixing the two ends to the first arm section 11 and the third arm section 13 respectively, and adjusting the tightness of the first pipeline segment 31 by the tensioning mechanism 2, so as to ensure the working condition of the first pipeline segment 31, and the first pipeline segment 31 is a common pipeline, which has a small volume, is convenient to install, and has a lower price.

[0037] It should be noted that when the pipeline mechanism is built-in, the influence of the telescopic arm on the pipeline mechanism needs to be considered. Although the zipper can directly overcome the above influence, the zipper is relatively large in size and is troublesome to install. If the zipper is installed in the telescopic arm 1, the space in the telescopic arm 1 is easily crowded. If the pipeline is directly laid on the inner wall of the telescopic arm 1, the pipeline is easily damaged and worn due to the influence of the telescopic arm 1. The first pipeline segment 31 is tensioned to overcome the above-mentioned disadvantages. At the same time, according to the telescopic direction of the telescopic arm 1, the front-rear direction and the head-tail direction of the section arm can be defined. The head-tail direction of the section arm is the same as the front-rear direction. The head-tail direction of the pipeline mechanism is defined according to the extension direction of the pipeline. For example, the extension direction of the first pipeline segment 31 is mainly from the first section arm 11 to the third section arm 13 inside, so the head end of the first pipeline segment 31 is on the first section arm 11, and the tail end of the first pipeline segment 31 is on the third section arm 13. The mounting seat 121 is arranged at the tail end of the second section arm 12, which means that the first fixing point 31a of the connection between the first pipeline segment 31 and the second section arm 12 is located at the tail end of the second section arm 12 and is staggered with the third section arm 13 when the first section arm 11, the second section arm 12 and the third section arm 13 reach the limit of the contraction state. The head end of the first pipeline segment 31 is fixed on the front end of the first section arm 11. The position of the head end needs to be ensured to be located in front of the tensioning wheel 21 when the first section arm 11, the second section arm 12 and the third section arm 13 reach the longest extension state, so that the distance between the head end of the first pipeline segment 31 and the tensioning wheel 21 is always in a state of reduction when the telescopic arm 1 is extended. Preferably, the head end of the first pipeline segment 31 is fixed below the most head end of the first section arm 11, so that the installation and fixation of the head end of the first pipeline segment 31 can be facilitated.

[0038] As shown in Figure 2 In the embodiment of the present application, the connecting assembly can be a connecting pin 23 and a locking nut 24. The end of the connecting pin 23 is sleeved on the tensioning screw 22 and is locked and fixed by the locking nut 24. The tensioning wheel 21 is pivoted on the connecting pin 23. Specifically, the end of the connecting pin 23 is provided with a connecting hole for sleeving on the tensioning screw 22. After the connecting pin 23 is sleeved on the tensioning screw 22, two locking nuts are screwed on the tensioning screw 22 and abut against both sides of the connecting pin 23, so as to complete the installation and fixation of the connecting pin 23. The tensioning wheel 21 is pivoted on the connecting pin 23 and is rotatably arranged. When the first pipeline segment 31 is pulled, the tensioning wheel 21 and the first pipeline segment 31 are in sliding contact, so as to avoid the wear of the first pipeline segment 31 by the tensioning wheel 21.

[0039] As shown in Figure 2As shown, in this embodiment of the invention, there are two mounting bases 121 and two tensioning screws 22. The mounting bases 121 are spaced parallel to each other on both sides of the tail end of the second arm 12. The two tensioning screws 22 are screwed onto the two mounting bases 121 one by one. The two ends of the connecting pin 23 are sleeved onto the two tensioning screws 22 one by one. The tensioning wheel 21 is pivotally connected to the connecting pin 23 and located between the two tensioning screws 22. Since the end of the connecting pin 23 is sleeved onto the tensioning screw 22 through the connecting hole, in order to prevent the tensioning wheel 21 from wobbling due to the rotation of the connecting pin 23 relative to the tensioning screw 22, it is necessary to fix both ends of the connecting pin 23 to form a stable pivoting structure. At the same time, by using the method of sleeved tensioning screws 22 through connecting holes, the tensioning screws 22 can still be rotated even when the tensioning wheel 21 and the connecting pin 23 are assembled.

[0040] like Figure 2 As shown in the embodiment of the present invention, the pipeline mechanism includes multiple conveying pipes, and the outer peripheral wall of the tensioning wheel 21 is provided with multiple roller grooves 211. The first pipeline segments 31 of the multiple conveying pipes are wound around the multiple roller grooves 211 in a one-to-one correspondence. When there are a large number of pipelines in the pipeline mechanism, the multiple roller grooves 211 are set to separate the multiple pipelines, thereby avoiding the situation where the multiple pipelines are squeezed against each other.

[0041] like Figure 2 As shown, in an embodiment of the present invention, the tensioning mechanism 2 further includes two mounting plates 25 sleeved on the connecting pin 23 and respectively disposed at both ends of the tensioning wheel 21, and a rope-blocking rod 26 connecting the two mounting plates 25. The rope-blocking rod 26 is spaced apart from the groove opening of the roller groove 211, and the gap distance between the rope-blocking rod 26 and the groove opening of the roller groove 211 is less than the thickness of the first pipeline segment 31. By setting the rope-blocking rod 26 and the mounting plates 25, the pipeline can be prevented from jumping out of the groove and squeezing the pipeline in other roller grooves 211.

[0042] In an embodiment of the present invention, the outer contour of the end of the connecting pin 23 is a polygonal contour, and the socket of the mounting plate 25 for fitting the connecting pin 23 is a polygonal hole. The mounting plate 25 is relatively fixedly fitted onto the connecting pin 23. By setting the polygonal contour and the polygonal hole, the position of the mounting plate 25 relative to the connecting pin 23 can be fixed, preventing the mounting plate 25 from rotating.

[0043] like Figure 1 , Figure 3 and Figure 7As shown, in the embodiment of the present application, the pipeline built-in telescopic device can be a four-section arm structure, that is, the telescopic arm support 1 further comprises a fourth section arm 14, the fourth section arm 14 is sleeved in the third section arm 13, the third section arm 13 is provided with a pipeline bracket 15, one end of the pipeline bracket 15 is fixed at the tail of the third section arm 13, the other end extends into the fourth section arm 14 and is in sliding abutment with the inner wall of the fourth section arm 14, the pipeline mechanism further comprises a second pipeline section 32 reversely stacked on the pipeline bracket 15, both ends of the second pipeline section 32 are connected with the tail end of the first pipeline section 31 and the fourth section arm 14 respectively, wherein the folded second pipeline section 32 is straightened forward when the telescopic arm support 1 reaches the maximum extension. Specifically, for the telescopic device of the four-section arm structure, it is necessary to provide a pipeline section extending from the third section arm 13 to the fourth section arm 14, and at the same time, the influence of the extension of the fourth section arm 14 on the pipeline section also needs to be considered when the pipeline section is provided, therefore, in the present application, by providing the second pipeline section 32, both ends of the second pipeline section 32 are connected with the tail end of the first pipeline section 31 and the fourth section arm 14 respectively, and the folded part between the two ends of the second pipeline section 32 can leave an extension allowance for the extension of the fourth section arm 14, so as to avoid the second pipeline section 32 from being pulled off. When the telescopic arm support 1 is extended, the fourth section arm 14 extends relative to the third section arm 13, which will pull the second pipeline section 32 to stretch, so as to slowly straighten the second pipeline section 32, when the telescopic arm support 1 is retracted, the fourth section arm 14 will retract into the third section arm 13, at this time, the second pipeline section 32 will be reversely folded into two sections, and by providing the pipeline bracket 15 to support the second pipeline section 32, the second pipeline section 32 can be prevented from contacting the inner wall of the third section arm 13 or the fourth section arm 14, so as to avoid the second pipeline section 32 from being abraded. As shown in the figure, Figure 5 As shown, the one end of the pipeline bracket 15 extending into the fourth section arm 14 is further provided with a sliding block 154, the sliding block 154 can facilitate the sliding of the pipeline bracket 15 relative to the fourth section arm 14, and at the same time, the sliding block 154 can position the pipeline bracket 15 to avoid shaking. Preferably, in order to facilitate the disassembly of the entire pipeline mechanism, the tail end of the first pipeline section 31 can be fixed on the pipeline bracket 15, that is, the first fixed point 31a is located on the pipeline bracket 15, and when disassembling, only the pipeline bracket 15 needs to be taken out.

[0044] As shown in the figure, Figure 1 , Figure 3 and Figure 7As shown in the embodiment of the present application, the second pipeline segment 32 comprises a fixed segment 321 and a folding segment 322, the pipeline bracket 15 comprises a fixed part 151 and a supporting part 152, a through hole 153 is arranged between the fixed part 151 and the supporting part 152, the fixed segment 321 is fixedly arranged at the bottom of the fixed part 151 by a fastener, the folding segment 322 passes through the through hole 153 and is folded and arranged on the fixed part 151 when the telescopic jib 1 is in the maximum retracted state, or is arranged on the supporting part 152 when the telescopic jib 1 is in the maximum extended state. Specifically, when the telescopic jib 1 is retracted to the limit, the second pipeline segment 32 is reversely folded into two segments, i.e. the fixed segment 321 and the folding segment 322, the position of the fixed segment 321 is always fixed relative to the third section arm 13, and in order to avoid the second pipeline segment 32 from falling off the pipeline bracket 15, the fixed segment 321 can be fixed on the fixed part 151 of the pipeline bracket 15, and the folding segment 322 will be reversely folded or positively straightened due to the traction of the fourth section arm 14, so the supporting part 152 is needed to support the folding segment 322, when the folding segment 322 is positively straightened, it will fall on the supporting part 152, and when the folding segment 322 is reversely folded, it will fall on the fixed part 151, i.e. through the fixed part 151 and the supporting part 152 of the pipeline bracket 15, the pipeline bracket 15 can bear the second pipeline segment 32 regardless of the extension or retraction of the telescopic jib 1, and fixing the second pipeline segment 32 at the bottom of the fixed part 151 can avoid the mutual extrusion of the fixed segment 321 and the folding segment 322 when the folding segment 322 falls on the fixed part 151, and fixing the position of the fixed end of the second pipeline segment 32 on the fixed part 151 can avoid the folding segment 322 from falling off the pipeline bracket 15 when it is folded.

[0045] As shown in the embodiment of the present application, Figure 3 and Figure 4 As shown in the embodiment of the present application, the fixed part 151 and the supporting part 152 are provided with U-shaped grooves with open upper ends, and the folding segment 322 can fall into the U-shaped grooves of the fixed part 151 or the supporting part 152. By arranging the U-shaped grooves, the folding segment 322 can be more conveniently borne, and the folding segment 322 can be prevented from leaking out of the pipeline bracket 15 and being abraded by the inner wall of the fourth section arm 14.

[0046] As shown in the embodiment of the present application, Figure 3 and Figure 4As shown, in this embodiment of the invention, the U-shaped groove of the fixing part 151 is a single-layer U-shaped groove, and the U-shaped groove of the support part 152 is a double-layer U-shaped groove. The upper bottom wall of the double-layer U-shaped groove is higher than the bottom wall of the single-layer U-shaped groove. Since the fixing section 321 is fixedly installed at the bottom of the fixing part 151, and the folding section 322 passes through the cable hole 153 and falls on the upper part of the fixing part 151 or the upper part of the support part 152, in order to avoid the second pipeline section 32 from being damaged due to excessive bending rate at the junction of the fixing end and the folding section 322, the upper bottom wall of the support part 152 is higher than the bottom wall of the fixing part 151, thereby protecting the folding section 322. It should be noted that if the pipeline bracket 15 is too short, the front end will slide out of the fourth section arm 14 when the boom is fully extended. If the pipeline bracket 15 is too long, it will increase the weight of the boom and reduce the rigidity of the pipeline bracket 15. Therefore, the length of the pipeline bracket 15 needs to be set at a moderate length.

[0047] like Figure 1 and Figure 7 As shown, in an embodiment of the present invention, the tail end of the second pipeline segment 32 is fixed to the tail end of the fourth arm 14. The pipeline mechanism also includes a third pipeline segment 33 laid inside the fourth arm 14 and extending from the tail end of the fourth arm 14 to the head end of the fourth arm 14. One end of the third pipeline segment 33 is connected to the tail end of the second pipeline segment 32. The connection point between the second pipeline segment 32 and the fourth arm 14 is the second fixing point 32a, which is located at the tail end of the fourth arm 14, thus facilitating the disassembly of the pipeline mechanism at the tail end of the telescopic boom 1. The main purpose of setting the third pipeline segment 33 is to extend the pipeline from the tail end of the fourth arm 14 to the head end of the fourth arm 14, thereby facilitating connection with other equipment at the head end of the telescopic boom 1. This segment is a fixed pipeline segment, and its position is always stationary relative to the fourth arm 14. Therefore, the third pipeline segment 33 can be directly fixed by setting a first pipeline groove inside the fourth arm 14.

[0048] In summary, for the four-section boom telescopic device, the built-in pipeline mechanism is mainly divided into three pipeline segments: the first pipeline segment 31, the second pipeline segment 32, and the third pipeline segment 33. The first fixing point 31a is preferably set on the pipeline bracket 15, and the second fixing point 32a is preferably set at the tail end of the fourth boom 14. Thus, when disassembling and assembling the pipeline mechanism, it is only necessary to disassemble and assemble at the two fixing points at the tail end of the telescopic boom 1 and the pipeline bracket 15. At the same time, the tensioning mechanism 2 and the pipeline bracket 15 can prevent wear and damage to the pipeline mechanism during the telescopic boom's extension and retraction, ensuring the working condition of the pipeline mechanism.

[0049] like Figure 6As shown, in the embodiment of the present application, the telescopic boom 1 is a three-section arm structure, and the pipeline mechanism further comprises a fourth pipeline segment 34 laid in the third section arm 13 and extending from the tail end of the third section arm 13 to the head end of the third section arm 13, one end of the fourth pipeline segment 34 being connected with the tail end of the first pipeline segment 31. The fourth pipeline segment 34 is also a fixed pipeline segment, and thus a second pipeline groove can be arranged in the third section arm 13 to fix the fourth pipeline segment 34.

[0050] To achieve the above object, the present application further provides an engineering machine, wherein the engineering machine comprises the pipeline built-in telescopic device according to the above description. Specifically, the engineering machine can be a high-altitude working vehicle, a forklift or the like, and since the engineering machine adopts all the technical solutions of the above embodiment, it at least has all the beneficial effects brought by the technical solutions of the above embodiment, which will not be repeated here.

[0051] In the description of the present application, it should be understood that the terms "first", "second" are used only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0052] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or communicate with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0053] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to 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, those skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0054] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and that variations, modifications, substitutions and changes can be made by those skilled in the art without departing from the scope of the present application.

Claims

1. A pipeline built-in telescoping device, characterized by, The pipeline built-in telescopic device comprises: A telescopic arm support (1) comprising a first arm section (11), a second arm section (12) and a third arm section (13) which are sequentially sleeved from outside to inside, a mounting seat (121) being arranged at the tail end of the second arm section (12), and a threaded hole being arranged on the mounting seat (121); A tensioning mechanism (2) comprising a tensioning wheel (21) and a tensioning screw (22), the tensioning screw (22) being screwed into the threaded hole and being movable in the front-rear direction, the tensioning wheel (21) being rotatably connected to the tensioning screw (22) by a connecting assembly and being movable with the tensioning screw (22), and the pivot axis direction of the tensioning wheel (21) being perpendicular to the front-rear direction; and A pipeline mechanism comprising a first pipeline section (31) which is laid in the gap between the first arm section (11) and the second arm section (12), the head end of the first pipeline section (31) being fixed to the front end of the first arm section (11), and the tail end of the first pipeline section (31) being fixed to the third arm section (13) by passing around the tensioning wheel (21); The telescopic arm support (1) further comprises a fourth arm section (14) which is sleeved in the third arm section (13), a pipeline bracket (15) being arranged on the third arm section (13), one end of the pipeline bracket (15) being fixed to the tail of the third arm section (13), the other end of the pipeline bracket (15) extending into the fourth arm section (14) and being in sliding abutment with the inner wall of the fourth arm section (14), and the pipeline mechanism further comprising a second pipeline section (32) which is reversely stacked on the pipeline bracket (15), the two ends of the second pipeline section (32) being connected with the tail end of the first pipeline section (31) and the fourth arm section (14) respectively; Wherein, the folded second pipeline section (32) is straightened in the forward direction when the telescopic arm support (1) reaches the maximum extension.

2. The inline pipe expansion joint of claim 1, wherein, The connecting assembly comprises a connecting pin (23) and a locking nut (24), the end of the connecting pin (23) being sleeved on the tensioning screw (22) and being locked and fixed by the locking nut (24), and the tensioning wheel (21) being pivotally connected to the connecting pin (23).

3. The inline pipe expansion joint of claim 2, wherein, The number of the mounting seats (121) and the tensioning screws (22) is two, the mounting seats (121) being arranged in parallel and spaced apart at the two sides of the tail end of the second arm section (12), the two tensioning screws (22) being correspondingly screwed into the two mounting seats (121), the two ends of the connecting pin (23) being correspondingly sleeved on the two tensioning screws (22), and the tensioning wheel (21) being pivotally connected to the connecting pin (23) and being located between the two tensioning screws (22).

4. The inline pipe expansion joint of claim 3, wherein, The pipeline mechanism comprises a plurality of conveying pipes, a plurality of roller grooves (211) being arranged on the outer peripheral wall of the tensioning wheel (21), and the first pipeline sections (31) of the plurality of conveying pipes being correspondingly wound around the plurality of roller grooves (211).

5. The inline pipe expansion joint of claim 4, wherein, The tensioning mechanism (2) further comprises two mounting plates (25) sleeved on the connecting pin (23) and arranged at two ends of the tensioning wheel (21), and a rope blocking rod (26) connecting the two mounting plates (25), the rope blocking rod (26) is arranged at intervals with the slot opening of the roller groove (211), and the gap distance between the rope blocking rod (26) and the slot opening of the roller groove (211) is less than the thickness of the first pipeline section (31).

6. The inline pipe expansion joint of claim 5, wherein, The end portion of the connecting pin (23) has a polygonal contour, and the sleeving hole of the mounting plate (25) for sleeving the connecting pin (23) is a polygonal hole, and the mounting plate (25) is relatively fixedly sleeved on the connecting pin (23).

7. The inline pipe expansion joint according to any one of claims 1 to 6, wherein The second pipeline section (32) comprises a fixed section (321) and a folded section (322), the pipeline bracket (15) comprises a fixed part (151) and a supporting part (152), a wire passing hole (153) is arranged between the fixed part (151) and the supporting part (152), the fixed section (321) is fixedly arranged at the bottom of the fixed part (151) through a fastener, and the folded section (322) passes through the wire passing hole (153) and is folded and arranged on the fixed part (151) when the telescopic jib (1) is in the maximum contraction state, or is arranged on the supporting part (152) when the telescopic jib (1) is in the maximum extension state.

8. The inline pipe expansion joint of claim 7, wherein, U-shaped grooves are arranged on the fixed part (151) and the supporting part (152) and have an upper end opening, and the folded section (322) can fall into the U-shaped grooves of the fixed part (151) or the supporting part (152).

9. The inline pipe expansion joint of claim 8, wherein, The U-shaped groove of the fixed part (151) is a single-layer U-shaped groove, and the U-shaped groove of the supporting part (152) is a double-layer U-shaped groove, and the upper layer bottom wall of the double-layer U-shaped groove is higher than the bottom wall of the single-layer U-shaped groove.

10. The inline expansion joint of any one of claims 1 to 6, wherein, The tail end of the second pipeline section (32) is fixed to the tail of the fourth section arm (14), and the pipeline mechanism further comprises a third pipeline section (33) arranged in the fourth section arm (14) and extending from the tail end of the fourth section arm (14) to the head end of the fourth section arm (14), and one end of the third pipeline section (33) is connected with the tail end of the second pipeline section (32).

11. The inline expansion joint of any one of claims 1 to 6, wherein, The telescopic jib (1) has a three-section arm structure, and the pipeline mechanism further comprises a fourth pipeline section (34) arranged in the third section arm (13) and extending from the tail end of the third section arm (13) to the head end of the third section arm (13), and one end of the fourth pipeline section (34) is connected with the tail end of the first pipeline section (31).

12. A working machine, characterized in that The pipeline built-in telescopic device comprises the pipeline built-in telescopic device according to any one of claims 1 to 11.

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