Telescopic arm oil filling port structure, friction block mounting structure, telescopic arm and engineering vehicle

Abstract

The utility model relates to the technical field of telescopic arms, in particular to a telescopic arm oil filling port structure, a friction block mounting structure, a telescopic arm and an engineering vehicle, which comprise an internal thread bushing fixedly arranged relative to a support arm; a locking piece and an adjusting piece are in threaded connection in the inner threaded sleeve, and the locking piece and the adjusting piece are coaxially arranged; a clamping hole is formed in the middle of the locking piece, and the adjusting piece is provided with a clamping groove corresponding to the clamping hole. An annular oil way is arranged on the end face of the adjusting piece adjacent to the locking piece; the adjusting piece is further provided with a first through hole oil way, an inlet of the first through hole oil way communicates with the annular oil way, and an outlet of the first through hole oil way is located in the end face, away from the locking piece, of the adjusting piece. The inner threaded sleeve is provided with a third through hole oil way, and the third through hole oil way communicates with the annular oil way. By arranging the annular oil way and arranging the third through hole oil way on the inner threaded sleeve, the oil can be supplemented without loosening the adjusting piece and the locking piece, namely, the oil can be supplemented on the premise of always pressing the friction block.

Description

Technical Field

[0001] This utility model relates to the field of telescopic boom technology, specifically to a telescopic boom oil inlet structure, a friction block mounting structure, a telescopic boom, and an engineering vehicle. Background Technology

[0002] Telescopic booms are widely used in engineering vehicles. A telescopic boom consists of multiple boom sections. Two adjacent boom sections can be divided into a support boom and a moving boom. The moving boom contacts friction blocks installed on the support boom. The contact surfaces between these friction blocks and the moving boom need to be lubricated.

[0003] One existing solution involves removing the friction block when lubrication needs to be replenished. However, this method of replenishing lubrication is inconvenient, and frequently loosening the friction block is also detrimental to practical use.

[0004] Another solution can be found in Chinese utility model patent publication number CN222293531U, which discloses a slider structure, a telescopic boom, and a telescopic boom forklift. The slider structure includes a slider body with a first end face, an oil guide groove, and an oil storage groove. An oil injection hole is located on the side of the slider body, and an oil passage connects the oil guide groove and the oil injection hole within the slider body. In this prior art, the slider is essentially a friction block, and the oil injection hole is directly located on the slider body. However, in actual use, the slider is installed inside the telescopic boom, making direct oiling of the slider difficult. Furthermore, during telescopic boom operation, the friction block needs to be in close contact with the moving arm. In the aforementioned prior art, when the slider becomes loose, the lubricating oil in the oil storage groove leaks quickly, requiring frequent oil replenishment. Utility Model Content

[0005] To solve the above problems, the purpose of this utility model is to provide a telescopic boom oil inlet structure, a friction block mounting structure, a telescopic boom, and an engineering vehicle.

[0006] The technical solution provided by this utility model is as follows:

[0007] In a first aspect, a telescopic arm oil inlet structure includes an internally threaded sleeve, which is fixedly disposed relative to a support arm; the internally threaded sleeve is threadedly connected to a locking element and an adjusting element, which are coaxially arranged; the locking element has a centrally located locking hole, and the adjusting element has a corresponding locking groove; the end face of the adjusting element adjacent to the locking element has an annular oil passage; the adjusting element also has a first through-hole oil passage, the inlet of which is connected to the annular oil passage, and the outlet of which is located on the end face of the adjusting element away from the locking element; the internally threaded sleeve has a third through-hole oil passage, which is connected to the annular oil passage.

[0008] As an optional technical solution in the first aspect, a boss is provided in the center of the end face of the adjusting member adjacent to the locking member, and the slot is provided on the boss; the outer edge of the boss is provided with an annular stepped surface; when the locking member and the adjusting member abut against each other, the annular stepped surface, the inner wall of the internal threaded sleeve, and the end face of the locking member adjacent to the adjusting member together form the annular oil passage.

[0009] In a second aspect, a friction block mounting structure includes a friction block located within an opening groove provided on a support arm; it also includes the telescopic arm oil inlet structure described in the first aspect or the optional technical solution of the first aspect.

[0010] The internal threaded sleeve is located on the side of the friction block away from the moving arm; the adjusting component is located between the locking component and the friction block; the friction block is provided with a second through-hole oil passage, the inlet of which is located on the end face of the friction block adjacent to the adjusting component; the outlet of the first through-hole oil passage is connected to the inlet of the second through-hole oil passage.

[0011] As a second aspect, an optional technical solution is provided, wherein the friction block has a first groove on the end face near the adjusting member; the end of the internal threaded sleeve is inserted into the first groove, and the outer wall of the internal threaded sleeve is in contact with the inner wall of the first groove.

[0012] As an optional technical solution in the second aspect, the adjusting member has a second groove on the end face near the friction block; when the adjusting member abuts against the friction block, the second groove and the end face of the friction block together form a transition oil passage; the outlet of the first through hole oil passage is connected to the inlet of the second through hole oil passage through the transition oil passage.

[0013] As an optional technical solution in the second aspect, the friction block is provided with an oil storage tank on the end face near the moving arm; the second through hole oil passage is connected to the oil storage tank.

[0014] As a second aspect, an optional technical solution is provided, in which a guide seat is installed in the opening groove, and the guide seat is provided with a guide groove; the friction block is installed in the guide groove.

[0015] Optionally, it also includes a cover plate, which is detachably connected to the guide seat; the cover plate is provided with a mounting hole for an internal threaded sleeve to pass through, and the internal threaded sleeve is fixedly connected to the cover plate.

[0016] Furthermore, the cover plate is provided with an oil inlet, which is connected to the third through hole oil passage.

[0017] Thirdly, a telescopic arm includes a support arm and a movable arm installed in the support arm; the support arm has a friction block mounting structure as described in the second aspect or any optional technical solution of the second aspect arranged on its upper side and / or left side and / or right side.

[0018] As a third aspect, an optional technical solution, a fixed frame is installed at the bottom of the inner wall of the support arm, a first bottom friction block is installed inside the fixed frame, and a first oil passage is provided on the first bottom friction block; the first oil passage is connected to a first oil port provided on the support arm.

[0019] And / or,

[0020] The support arm has a bottom hole at its bottom; a bottom cover plate is installed at the bottom hole port, and the bottom cover plate is detachably connected to the support arm.

[0021] A second bottom friction block is installed on the bottom cover plate, and a second oil passage is provided on the second bottom friction block. The second oil passage is connected to a second oil port provided on the bottom cover plate.

[0022] Fourthly, an engineering vehicle including the telescopic boom of the third aspect or an alternative technical solution of the third aspect.

[0023] Compared with the prior art, the technical solution provided by this utility model has the following advantages:

[0024] The oil inlet of this utility model is equipped with an adjusting component and a locking component that are threadedly connected to the internal threaded sleeve. The oil passage is set in the adjusting component and the internal threaded sleeve, eliminating the need for additional components to form an oil passage in the telescopic arm and facilitating direct oil replenishment from the outside of the telescopic arm. In addition, by setting an annular oil passage and a third through hole oil passage on the internal threaded sleeve, this application can achieve oil replenishment without loosening the adjusting component and the locking component. That is, oil replenishment can be completed while keeping the friction block pressed. Specifically, because the annular oil passage is annular and has an axial dimension, even if the adjusting component is rotated and its position changes, the annular oil passage can still maintain communication with the third through hole oil passage, so that oil replenishment can always be performed even if the position of the adjusting component is adjusted. Attached Figure Description

[0025] Figure 1 This is an exploded view of the friction block mounting structure in one embodiment of this application;

[0026] Figure 2 This is a schematic diagram of the installation of the adjusting member and the locking member in one embodiment of this application;

[0027] Figure 3 This is a schematic diagram showing the location of the third through-hole oil passage in one embodiment of this application;

[0028] Figure 4 This is a schematic diagram of the installation of the first bottom friction block in one embodiment of this application;

[0029] Figure 5 This is a schematic diagram of the installation of the second bottom friction block in one embodiment of this application;

[0030] Figure 6 This is a cross-sectional view of the telescopic arm in one embodiment of this application.

[0031] Explanation of the labels in the diagram:

[0032] Support arm 101, bottom hole 101-1, moving arm 102, guide seat 103, guide groove 103-1, cover plate 104, oil inlet 104-1, internal threaded sleeve 105, third through hole oil passage 105-1;

[0033] Friction block 201, first groove 201-1, second through hole oil passage 201-2, adjusting component 301, slot 301-1, first through hole oil passage 301-2, transition oil passage 301-3, annular oil passage 301-4, locking component 401, locking hole 401-1, fixing frame 501, first bottom friction block 502, first oil passage 502-1, bottom cover plate 601, second bottom friction block 602, second oil port 603. Detailed Implementation

[0034] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings and embodiments.

[0035] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the invention. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed in this utility model. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of implementation. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0036] In one embodiment, such as Figure 1-3 As shown, this application proposes a telescopic arm oil inlet structure, including an internal threaded sleeve 105, an adjusting member 301, and a locking member 401. Specifically, the internal threaded sleeve 105 needs to be fixedly set relative to the support arm 101, that is, the internal threaded sleeve 105 can be directly fixedly connected to the support arm 101, or it can be first fixedly connected to other components, and then the other components are fixedly connected to the support arm 101. The internal threaded sleeve 105 here has an internal threaded through hole, and the outer edge of the internal threaded sleeve 105 can be circular or other shapes. In the attached drawings of this embodiment, the outer edge of the internal threaded sleeve 105 is circular.

[0037] The adjusting member 301 and the locking member 401 are provided with external threads, and both the adjusting member 301 and the locking member 401 are installed in the internal thread through hole of the internal thread sleeve 105. The two are arranged coaxially and are threadedly connected to the internal thread sleeve 105. The adjusting member 301 and the locking member 401 can be in the shape of bolts. It should be noted that the external threads of the adjusting member 301 and the locking member 401 need to meet the following conditions: when the adjusting member 301 and the locking member 401 are rotated clockwise synchronously, the adjusting member 301 and the locking member 401 move axially in the same direction at the same time; when the adjusting member 301 and the locking member 401 are rotated counterclockwise synchronously, the adjusting member 301 and the locking member 401 move axially in the other direction at the same time. That is to say, the thread helix directions of the adjusting member 301 and the locking member 401 are the same.

[0038] The locking member 401 is provided with a clamping hole 401-1 in the middle, and the adjusting member 301 is provided with a clamping groove 301-1 corresponding to the clamping hole 401-1. The locking member 401 can be driven to rotate by inserting a tool into the clamping hole 401-1. The correspondence between the clamping groove 301-1 and the clamping hole 401-1 means that when the locking member 401 is pressed against the adjusting member 301 in the internal thread through hole (the end face of the locking member 401 contacts the end face of the adjusting member 301), the tool inserted into the clamping hole 401-1 can also be inserted into the clamping groove 301-1, so as to drive the adjusting member 301 and the locking member 401 to rotate together through the tool.

[0039] The clamping hole 401-1 and the clamping groove 301-1 can be in the shape of "one", or in the shape of "cross", or in the shape of "rice", or in the shape of internal triangle or internal quadrilateral or internal hexagon or internal octagon, etc.

[0040] It should be noted that the shapes of the clamping hole 401-1 and the clamping groove 301-1 can be the same. The shapes of the clamping hole 401-1 and the clamping groove 301-1 can also be not completely the same, as long as the shape of the clamping hole 401-1 can coincide with the shape of a part of the clamping groove 301-1. For example, when the clamping hole 401-1 is in the shape of "one", the clamping groove 301-1 can be in the shape of "cross".

[0041] The above-mentioned tool is adapted to the shapes of the clamping hole 401-1 and the clamping groove 301-1. When the tool is inserted into the clamping hole 401-1 and the clamping groove 301-1, the torque can be transmitted through the tool by rotating the tool. For example, when the clamping hole 401-1 and the clamping groove 301-1 are in the shape of internal hexagon, a hexagonal prism can be inserted, and the adjusting member 301 and the locking member 401 can be driven to rotate counterclockwise synchronously or clockwise synchronously by rotating the hexagonal prism.

[0042] An annular oil passage 301-4 is provided on the end face of the adjusting member 301 adjacent to the locking member 401. The adjusting member 301 also has a first through-hole oil passage 301-2. The inlet of the first through-hole oil passage 301-2 is located on the end face of the adjusting member 301 adjacent to the locking member 401, and the inlet of the first through-hole oil passage 301-2 is connected to the annular oil passage 301-4. The outlet of the first through-hole oil passage 301-2 is located on the end face of the adjusting member 301 opposite to the locking member 401.

[0043] The internal threaded sleeve 105 is provided with a third through-hole oil passage 105-1, which is connected to the annular oil passage 301-4. It should be noted that the annular oil passage 301-4 has an axial dimension. When the rotating adjusting member 301 presses against the friction block, the position of the adjusting member 301 will change. Because the annular oil passage 301-4 is annular and has an axial dimension, it can always be connected to the third through-hole oil passage 105-1. This allows for oil replenishment without loosening the adjusting member or the locking member, meaning oil replenishment can be completed while the friction block is always pressed against it. Furthermore, the annular oil passage 301-4 also serves to store lubricating oil, avoiding frequent oil replenishment.

[0044] In this embodiment, the adjusting component and the locking component can be rotated together, so that the adjusting component abuts against the friction block, making the friction block fit tightly against the moving arm. The oil passage is set in the adjusting component 301 and the internal threaded sleeve 105, eliminating the need to add additional components to the telescopic arm to form the oil passage, and also facilitating direct oil replenishment from the outside of the telescopic arm.

[0045] As an optional solution, the adjusting member 301 has a boss centered on the end face adjacent to the locking member 401, and the slot 301-1 is provided on the boss. An annular stepped surface is provided on the outer edge of the boss. When the locking member 401 is turned so that it abuts against the adjusting member 301, the annular stepped surface, the inner wall of the internal threaded sleeve 105, and the end face of the locking member 401 adjacent to the adjusting member 301 together form an annular oil passage 301-4.

[0046] In another embodiment, this application also proposes a friction block mounting structure, such as... Figure 1-3 As shown, it includes a friction block 201, which is located in the opening groove provided in the support arm 101. It should be noted that the friction block 201 can be directly set in the opening groove provided in the support arm 101, or other components can be installed in the opening groove first, and then the friction block 201 can be installed in the other components. It is only necessary to make the friction block 201 fit tightly against the movable arm 102 inside the support arm 101.

[0047] The friction block mounting structure also includes the aforementioned telescopic arm oil inlet structure. Specifically, the internal threaded sleeve 105 is located on the side of the friction block 201 away from the moving arm 102, the adjusting member 301 is located between the locking member 401 and the friction block 201, and the outlet of the first through hole oil passage 301-2 is located on the end face of the adjusting member 301 adjacent to the friction block 201.

[0048] The friction block 201 is provided with a second through hole oil passage 201-2. The inlet of the second through hole oil passage 201-2 is located on the end face of the friction block 201 adjacent to the adjusting member 301. The outlet of the first through hole oil passage 301-2 is connected to the inlet of the second through hole oil passage 201-2.

[0049] During oil replenishment, the lubricating oil passes sequentially through the third through-hole oil passage 105-1, the annular oil passage 301-4, the first through-hole oil passage 301-2, and the second through-hole oil passage 201-2, finally reaching the contact surface between the friction block 201 and the moving arm 102.

[0050] As an optional implementation, the friction block 201 has a first groove 201-1 on the end face near the adjusting member 301. During assembly, the end of the internal threaded sleeve 105 is inserted into the first groove 201-1, and it is necessary to ensure that the outer wall of the internal threaded sleeve 105 fits against the inner wall of the first groove 201-1.

[0051] To facilitate the even flow of lubricating oil to all positions on the contact surface between the friction block 201 and the moving arm 102, preferably, the second through-hole oil passage 201-2 is located in the middle of the friction block 201, in which case the second through-hole oil passage 201-2 is connected to the first groove 201-1. Figure 2 As shown, by fitting the outer wall of the internal threaded sleeve 105 against the inner wall of the first groove 201-1, a sealing effect can be formed to prevent lubricating oil from entering the cavity, thereby preventing lubricating oil from leaking to the outside of the telescopic arm.

[0052] Optionally, the adjusting member 301 has a second groove on its end face near the friction block 201. When the adjusting member 301 abuts against the friction block 201, the second groove and the friction block 201 form a transition oil passage 301-3. The outlet of the first through-hole oil passage 301-2 is connected to the inlet of the second through-hole oil passage 201-2 through the transition oil passage 301-3. In addition, the transition oil passage 301-3 can also store lubricating oil, avoiding frequent oil replenishment.

[0053] In addition, the friction block 201 has an oil reservoir on its end face near the moving arm 102, and the second through-hole oil passage 201-2 is connected to the oil reservoir. This allows some lubricating oil to be stored in the oil reservoir, thus avoiding frequent oil replenishment.

[0054] As an optional embodiment, a guide seat 103 is installed in the opening slot, and the guide seat 103 has a guide groove 103-1. The friction block 201 is installed in the guide groove 103-1. The guide groove 103-1 restricts the friction block 201 to only make linear movements toward or away from the telescopic arm in a direction perpendicular to the axis of the telescopic arm.

[0055] Optionally, the friction block mounting structure also includes a cover plate 104, which is detachably connected to the guide seat 103, for example, by bolts.

[0056] The cover plate 104 has a mounting hole for the internal threaded sleeve 105 to pass through, and the internal threaded sleeve 105 is fixedly connected to the cover plate 104, for example, by welding. When it is necessary to disassemble the friction block 201, the adjusting part 301 and the locking part 401 can be removed together by removing the cover plate 104.

[0057] The cover plate 104 is provided with an oil inlet 104-1, which is connected to the third through hole oil passage 105-1. At this time, the oil inlet 104-1 and the third through hole oil passage 105-1 can be connected by a plastic tube, etc., so as to facilitate oil replenishment through the oil inlet 104-1.

[0058] In one embodiment, this application also proposes a telescopic arm, such as Figure 4-6 As shown, it includes a support arm 101 and a movable arm 102 mounted in the support arm 101. The aforementioned friction block mounting structure is arranged on the upper side and / or left side and / or right side of the support arm 101.

[0059] Conventionally, the aforementioned friction block mounting structure is installed on the top, left, and right sides of the telescopic arm.

[0060] As an alternative implementation scheme, such as Figure 4 As shown, a fixing frame 501 is installed on the bottom (lower side) of the inner wall of the support arm 101. A first bottom friction block 502 is installed inside the fixing frame 501. A first oil passage 502-1 is provided on the first bottom friction block 502. The first oil passage 502-1 is connected to a first oil port provided on the support arm 101.

[0061] A plug is usually installed at the first oil port. When oil needs to be added or drained, the plug is opened.

[0062] like Figure 5 As shown, the bottom of the support arm 101 is provided with a bottom hole 101-1, and a bottom cover plate 601 is installed at the port of the bottom hole 101-1. The bottom cover plate 601 is detachably connected to the support arm 101, for example, by bolt connection.

[0063] A second bottom friction block 602 is installed on the bottom cover plate 601. The second bottom friction block 602 is provided with a second oil passage, which is connected to a second oil port 603 provided on the bottom cover plate 601. Similarly, a plug is generally installed on the second oil port 603. When oil needs to be added or drained, the plug is opened.

[0064] In one embodiment, this application also proposes an engineering vehicle, which includes the telescopic boom described above. The engineering vehicle can be a rock drilling rig or other similar vehicle.

[0065] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A telescopic boom oil inlet structure, characterized in that, Includes an internal threaded sleeve (105), wherein a locking element (401) and an adjusting element (301) are threadedly connected in the internal threaded sleeve (105), and the locking element (401) and the adjusting element (301) are arranged coaxially; The locking component (401) has a centrally located locking hole (401-1), and the adjusting component (301) has a corresponding locking groove (301-1). The end face of the adjusting member (301) adjacent to the locking member (401) is provided with an annular oil passage (301-4). The adjusting member (301) is also provided with a first through hole oil passage (301-2), the inlet of the first through hole oil passage (301-2) is connected to the annular oil passage (301-4), and the outlet of the first through hole oil passage (301-2) is located on the end face of the adjusting member (301) away from the locking member (401); The internal threaded sleeve (105) is provided with a third through hole oil passage (105-1), which is connected to the annular oil passage (301-4).

2. The telescopic boom oil inlet structure according to claim 1, characterized in that: The adjusting member (301) has a boss at the center of the end face adjacent to the locking member (401), and the slot (301-1) is provided on the boss; The outer edge of the boss has an annular stepped surface; When the locking member (401) abuts against the adjusting member (301), the annular step surface, the inner wall of the internal threaded sleeve (105), and the end face of the locking member (401) adjacent to the adjusting member (301) together form the annular oil passage (301-4).

3. A friction block mounting structure, characterized in that: Includes a friction block (201), which is located in an opening groove provided in the support arm (101); It also includes the telescopic boom oil inlet structure as described in any one of claims 1-2; in, The internal threaded sleeve (105) is located on the side of the friction block (201) away from the moving arm (102); The adjusting member (301) is located between the locking member (401) and the friction block (201); The friction block (201) is provided with a second through-hole oil passage (201-2), and the inlet of the second through-hole oil passage (201-2) is located on the end face of the friction block (201) adjacent to the adjusting member (301); The outlet of the first through-hole oil passage (301-2) is connected to the inlet of the second through-hole oil passage (201-2).

4. The friction block mounting structure according to claim 3, characterized in that: The friction block (201) has a first groove (201-1) on its end face near the adjusting member (301); the end of the internal threaded sleeve (105) is inserted into the first groove (201-1), and the outer wall of the internal threaded sleeve (105) is in contact with the inner wall of the first groove (201-1).

5. The friction block mounting structure according to claim 3, characterized in that: The adjusting member (301) has a second groove on its end face near the friction block (201); When the adjusting member (301) abuts against the friction block (201), the second groove and the end face of the friction block (201) together form a transition oil passage (301-3). The outlet of the first through-hole oil passage (301-2) is connected to the inlet of the second through-hole oil passage (201-2) through the transition oil passage (301-3).

6. The friction block mounting structure according to claim 3, characterized in that: The friction block (201) has an oil storage tank on its end face near the moving arm (102); The second through-hole oil passage (201-2) is connected to the oil storage tank.

7. The friction block mounting structure according to any one of claims 3-6, characterized in that: A guide seat (103) is installed in the opening groove, and the guide seat (103) is provided with a guide groove (103-1); The friction block (201) is installed in the guide groove (103-1).

8. The friction block mounting structure according to claim 7, characterized in that: It also includes a cover plate (104), which is detachably connected to the guide seat (103); The cover plate (104) is provided with an installation hole for the internal threaded sleeve (105) to pass through, and the internal threaded sleeve (105) is fixedly connected to the cover plate (104).

9. The friction block mounting structure according to claim 8, characterized in that: The cover plate (104) is provided with an oil inlet (104-1), which is connected to the third through hole oil passage (105-1).

10. A telescopic boom, comprising a support arm (101) and a movable arm (102) mounted in the support arm (101). Its features are: The support arm (101) is equipped with a friction block mounting structure as described in any one of claims 3-9 on its upper side and / or left side and / or right side.

11. The telescopic arm according to claim 10, characterized in that: A fixing frame (501) is installed at the bottom of the inner wall of the support arm (101), and a first bottom friction block (502) is installed inside the fixing frame (501). A first oil passage (502-1) is provided on the first bottom friction block (502). The first oil passage (502-1) is connected to the first oil port provided on the support arm (101); And / or, The support arm (101) has a bottom hole (101-1) at the bottom; a bottom cover plate (601) is installed at the bottom hole (101-1) port, and the bottom cover plate (601) is detachably connected to the support arm (101); A second bottom friction block (602) is installed on the bottom cover plate (601), and a second oil passage is provided on the second bottom friction block (602). The second oil passage is connected to the second oil port (603) provided on the bottom cover plate (601).

12. An engineering vehicle, characterized in that: Includes the telescopic arm as described in any one of claims 10-11.

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