Anti-loose sliding block device, telescopic arm and engineering machinery

Abstract

The utility model relates to the technical field of telescopic arm structures, and discloses an anti-loose sliding block device, a telescopic arm and engineering machinery, the anti-loose sliding block device comprises a sliding block component and a limiting component, the sliding block component is suitable for being arranged between a first arm section and a second arm section which are inserted in a sliding mode in the first direction, and the sliding block component is a wear-resistant block; the limiting component is suitable for being fixedly connected with the surface of a first arm section, and the sliding block component is slidably connected with the limiting component in the first direction, so that the problems that a sliding block is prone to falling off, and the service life of the arm section is short are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of telescopic arm structure, in particular to a loosening-preventing sliding block device, telescopic arm and engineering machinery. BACKGROUND

[0002] The telescopic arm is one of the main structural forms of multifunctional engineering machinery (such as aerial work platforms, cranes, etc.), and the relative movement between the arm sections is supported in a sliding friction form, that is, a sliding block is installed on the inner surface of the outer arm, and the sliding block slides relative to the outer surface of the inner arm, or a sliding block is installed on the outer surface of the inner wall, and the sliding block slides relative to the inner surface of the outer wall; in order to ensure the stability of the relative movement between the outer arm and the inner arm, the matching gap precision between the sliding block and the inner arm or the outer arm is required to be high, generally between 0.5-1mm.

[0003] In the related art, the sliding block is usually installed on the outer surface of the inner arm or the inner surface of the outer arm by cooperating with the countersunk hole on the sliding block through a bolt, so that the arm section will exert a sliding friction force on the sliding block during the reciprocating sliding process, and the sliding friction force will make the sliding block have a tendency to reciprocate with the arm section, so that an extrusion force will be generated between the sliding block and the bolt.

[0004] However, since the material of the sliding block is nylon or copper block, which is softer than the arm section and the bolt, the sliding block will extrude the fixed bolt, and due to the existence of the extrusion force, the bolt will be loosened and even fall off, causing the sliding block to fall off, thereby affecting the service life of the arm section. CONTENT OF THE UTILITY MODEL

[0005] Therefore, the present application provides a loosening-preventing sliding block device, telescopic arm and engineering machinery to improve the problem that the sliding block is easy to fall off and the service life of the arm section is short.

[0006] In a first aspect, the present application provides a loosening-preventing sliding block device, which comprises a sliding block component and a limiting component, the sliding block component is adapted to be arranged between a first arm section and a second arm section which are slidingly inserted along a first direction, and the sliding component is a wear-resistant block; the limiting component is adapted to be fixedly connected with the surface of the first arm section, and the sliding block component is slidingly connected with the limiting component along the first direction.

[0007] Beneficial effects: by slidingly connecting the sliding block component and the limiting component along the first direction, the sliding block component can reciprocate with the second arm section within a certain range during the relative sliding of the first arm section and the second arm section, thereby reducing the extrusion deformation of the sliding block component, reducing the risk of falling off of the limiting component and the sliding block component, avoiding damage to the arm section, and improving the service life of the arm section.

[0008] In an optional embodiment, a stepped hole is provided on the slider component, and the limiting component is a stepped block, which can slide back and forth in the stepped hole along the first direction. The stepped block cooperates with the stepped hole to limit the limiting component along the second direction, wherein the second direction is a direction away from the mounting surface of the limiting component on the first arm section.

[0009] Beneficial effect: By arranging a stepped hole on the slider component and the limiting component being a stepped block, the two cooperate to slide back and forth along the first direction and limit the slider component along the second direction. The structure is simple and the manufacturing is convenient.

[0010] In an optional embodiment, the stepped hole includes a first hole segment and a second hole segment connected along the second direction, and the cross-sectional area of ​​the first hole segment is smaller than the cross-sectional area of ​​the second hole segment; the stepped block includes a first block and a second block connected along the second direction, and the cross-sectional area of ​​the first block along the second direction is smaller than the cross-sectional area of ​​the second block along the second direction; the second block is accommodated in the second hole segment, and the second block and the second hole segment are clearance-fitted along a third direction, the first block and the first hole segment are clearance-fitted along the third direction, the surface connecting the first hole segment and the second hole segment is an intermediate surface, and the second block is clearance-fitted with the intermediate surface, wherein the third direction is perpendicular to both the first direction and the second direction.

[0011] Beneficial effects: The stepped hole includes a first hole segment and a second hole segment connected along the second direction, and the cross-sectional area of ​​the first hole segment is smaller than the cross-sectional area of ​​the second hole segment; the stepped block includes a first block and a second block connected along the second direction, and the cross-sectional area of ​​the first block along the second direction is smaller than the cross-sectional area of ​​the second block along the second direction, and the second block is gap-fitted with the middle surface to form a two-step sliding fitting structure, and the slider component is limited along the second direction by the second block. The parts structure is simple and easy to manufacture, which can reduce production costs.

[0012] In an optional embodiment, the first hole segment and the second hole segment are both waist-round holes; and / or, the first block and the second block are both waist-round blocks.

[0013] Beneficial effects: The first hole segment and the second hole segment are both waist-round holes, which are clearance-matched with the first block and the second block, both of which are waist-round blocks, respectively, so that the limiting component can slide back and forth along the first direction and limit the shaking amount of the limiting component along the third direction, thereby improving the stability of the reciprocating motion of the slider component.

[0014] In an alternative embodiment, the cross section of the first hole section along the second direction is proportionally arranged with the cross section of the second hole section along the second direction; and / or, the cross section of the first block along the second direction is proportionally arranged with the cross section of the second block along the second direction.

[0015] Beneficial effects: the cross section of the first hole section along the second direction is proportionally arranged with the cross section of the second hole section along the second direction, and correspondingly, the cross section of the first block along the second direction is proportionally arranged with the cross section of the second block along the second direction, which can ensure the uniformity of the gap between the sliding block component and the limiting component, reduce local uneven wear, and improve the service life of the sliding block component or the limiting component.

[0016] In an alternative embodiment, the fitting gap of the first block along the third direction with the first hole section is greater than zero; and / or, the fitting gap of the second block along the third direction with the second hole section is greater than zero; and / or, the fitting gap of the second block along the third direction with the intermediate surface is greater than zero.

[0017] Beneficial effects: the fitting gap of the first block along the third direction with the first hole section is greater than zero; and / or, the fitting gap of the second block along the third direction with the second hole section is greater than zero; and / or, the fitting gap of the second block along the third direction with the intermediate surface is greater than zero, so that the sliding block component and the limiting component are arranged with a gap greater than zero everywhere, which can reduce the sliding friction resistance of the sliding block component and the limiting component along the first direction when the sliding block component is deformed under pressure, and facilitate the reciprocating movement of the sliding block component with the second arm section within a certain amplitude.

[0018] In an alternative embodiment, the anti-loose sliding block device further comprises a backing plate, which is fixedly arranged on the first arm section, and the backing plate is in sliding contact with the sliding block component.

[0019] Beneficial effects: the arrangement of the backing plate can facilitate the adjustment of the uniformity of the gap between the first arm section and the second arm section.

[0020] In an alternative embodiment, the backing plate is pressed on the first arm section by the limiting component.

[0021] Beneficial effects: the backing plate is pressed on the first arm section by the limiting component, so that it is not necessary to separately arrange a fixing structure of the backing plate, which can simplify the overall structure and reduce the cost.

[0022] In a second aspect, the application further provides a telescopic arm, comprising a first arm section, a second arm section, and an anti-loose sliding block device of any one of the above embodiments, the second arm section is arranged in sliding insertion with the first arm section along the first direction; and the limiting component is fixedly connected with the surface of the first arm section.

[0023] Beneficial effect: Because the telescopic arm includes an anti-loosening slider device, it has the same effect as the anti-loosening slider device, which will not be described in detail here.

[0024] In a third aspect, the present application also provides an engineering machine comprising the telescopic arm as described above.

[0025] Beneficial effect: Since the engineering machinery includes a telescopic arm, it has the same effect as the telescopic arm and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of this application or the technical solutions in related technologies, the following is a brief introduction to the drawings required for use in the specific implementation methods or related technical descriptions. Obviously, the drawings described below are some implementation methods of this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0027] Figure 1 This is the structure of a slider in a telescopic arm in the related art;

[0028] Figure 2 A schematic structural diagram of an anti-loosening slider device provided in this application;

[0029] Figure 3 for Figure 2 Exploded view of the parts after removing the second arm section.

[0030] Description of reference numerals:

[0031] 1. Slider; 2. Inner arm; 3. Outer arm;

[0032] 4. Slider component; 5. Limit component; 6. Pad; 7. First arm section; 8. Second arm section;

[0033] 41. Step hole; 51. Step block;

[0034] 411, first hole section; 412, second hole section; 413, intermediate surface; 511, first block; 512, second block. DETAILED DESCRIPTION

[0035] To make the purpose, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of this application.

[0036] In the related art, the telescopic arm is one of the main structural forms of multifunctional engineering machinery (such as aerial work platforms, cranes and the like), and the relative movement between the arm sections is supported in a sliding friction form, that is, a sliding block is mounted on the inner surface of the outer arm, and the sliding block slides relative to the outer surface of the inner arm, or a sliding block is mounted on the outer surface of the inner wall, and the sliding block slides relative to the inner surface of the outer wall; in order to ensure the stability of the relative movement between the outer arm and the inner arm, the matching gap between the sliding block and the inner arm or the outer arm has a high precision requirement, and is generally between 0.5-1mm.

[0037] As shown in Figure 1 , the sliding block 1 is usually mounted on the outer surface of the inner arm 2 (as shown in Figure 1 ) or the inner surface of the outer arm 3 through the cooperation of bolts and counterbores on the sliding block, so that the arm section will exert a sliding friction force on the sliding block during the reciprocating sliding process, and the sliding friction force will make the sliding block have a tendency to reciprocate with the arm section, so that an extrusion force will be generated between the sliding block and the bolt.

[0038] However, since the material of the sliding block is nylon or copper block, which is softer than the arm section and the bolt, the sliding block extrudes the fixed bolt, and due to the existence of the extrusion force, the bolt will loosen and even fall off, causing the sliding block to fall off, thereby affecting the stability of the relative sliding between the arm sections.

[0039] Therefore, the application provides a loosening-preventing sliding block device, a telescopic arm and engineering machinery to improve the problem that the sliding block is easy to fall off and the service life of the arm section is short.

[0040] The embodiments of the application will be described below in conjunction with Figures 2 to 3 .

[0041] According to the embodiments of the application, in a first aspect, a loosening-preventing sliding block device is provided, as shown in Figure 2 and Figure 3 , comprising a sliding block component 4 and a limiting component 5, the sliding block component 4 is adapted to be arranged between a first arm section 7 and a second arm section 8 which are slidingly inserted in a first direction, and the sliding block component 4 is a wear-resistant block; the limiting component 5 is adapted to be fixedly connected to the surface of the first arm section 7 by means of bolt screwing or riveting or other ways, and the sliding block component 4 and the limiting component 5 are slidingly connected in the first direction.

[0042] It should be noted that in the above scheme, the first arm section 7 can be slidingly inserted into the second arm section 8, and correspondingly, the limiting component 5 is installed on the outer surface of the first arm section 7; of course, the second arm section 8 can also be slidingly inserted into the first arm section 7, and correspondingly, the limiting component 5 is installed on the inner surface of the first arm section 7.

[0043] It should be explained that the slider component 4 is a wear-resistant block, that is, the slider component 4 is made of wear-resistant material, and the material can be any one of nylon or copper block, or other wear-resistant materials.

[0044] Specifically, the maximum sliding clearance between the slider component 4 and the limiting component 5 along the first direction is 1mm to 2mm, which can be any one of 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm and 2mm, and of course can be other values, preferably 1mm or 2mm.

[0045] The first direction, the second direction and the third direction are detailed in Figure 3 shown.

[0046] In this embodiment, Figure 2 and Figure 3 As shown, the slider component 4 is connected to the limiting component 5 by sliding along the first direction, so that during the relative sliding of the first arm section 7 and the second arm section 8, the slider component 4 can slide back and forth with the second arm section 8 to a certain extent (it should be noted that the second arm section 8 is not necessarily the part that is driven to extend, and may be stationary, but it has relative movement relative to the first arm section 7, which can make the slider component 4 move back and forth with the first arm section 7 to a certain extent), thereby reducing the amount of extrusion deformation of the slider component 4, reducing the risk of the limiting component 5 and the slider component 4 falling off, avoiding damage to the arm section, and improving the service life of the arm section.

[0047] In one embodiment, Figure 2 and Figure 3 As shown, a stepped hole 41 is provided on the slider component 4, and the limiting component 5 is a stepped block 51. The stepped block 51 can slide back and forth in the stepped hole 41 along the first direction. The stepped block 51 cooperates with the stepped hole 41 to limit the limiting component 5 along the second direction, wherein the second direction is the direction away from the mounting surface of the limiting component 5 on the first arm section 7.

[0048] It should be explained that the second direction is the direction away from the installation surface of the upper limit component 5 on the first arm section 7, that is, the second direction is the direction from the installation surface corresponding to the upper limit component 5 on the first arm section 7 to the second arm section 8.

[0049] It should be noted that the stepped block 51 cooperates with the stepped hole 41 to limit the limiting component 5 along the second direction in order to prevent the slider component 4 from moving away from the first arm section 7 and to avoid the slider component 4 and the first arm section 7 from falling off.

[0050] In this embodiment, a stepped hole 41 is provided on the slider component 4 and the limiting component 5 is a stepped block 51. The two cooperate to slide back and forth in the first direction and limit the limiting component 5 in the second direction. The structure is simple and easy to manufacture.

[0051] In some embodiments not shown, a sliding groove extending along the first direction can be provided on the limiting component 5, and the slider component 4 slides back and forth in the first direction in the sliding groove, and the sliding groove can limit the movement of the slider component 4 along the second direction; of course, it can also be any other structure, as long as it can satisfy the reciprocating sliding of the slider component 4 along the first direction, and the limiting component 5 can limit the slider component 4 along the second direction.

[0052] In a specific embodiment, Figure 2 and Figure 3 As shown, the stepped hole 41 includes a first hole section 411 and a second hole section 412 connected along the second direction, and the cross-sectional area of ​​the first hole section 411 is smaller than the cross-sectional area of ​​the second hole section 412; the stepped block 51 includes a first block 511 and a second block 512 connected along the second direction, and the cross-sectional area of ​​the first block 511 along the second direction is smaller than the cross-sectional area of ​​the second block 512 along the second direction; the second block 512 is accommodated in the second hole section 412, and the second block 512 is clearance-fitted with the second hole section 412 along the third direction, and the first block 511 is clearance-fitted with the first hole section 411 along the third direction, and the surface connecting the first hole section 411 and the second hole section 412 is the middle surface 413, and the second block 512 is clearance-fitted with the middle surface 413, wherein the third direction is perpendicular to both the first direction and the second direction.

[0053] It should be noted that the cross-sections of the first hole segment 411 and the second hole segment 412 can be any shape such as circular, square, elliptical, etc., as long as they cooperate with the limiting component 5, the slider component 4 can have a certain amount of swing along the first direction; similarly, the cross-sections of the first block 511 and the second block 512 can be any shape such as circular, square, elliptical, etc., as long as they cooperate with the slider component 4, the slider component 4 can have a certain amount of swing along the first direction.

[0054] It should be noted that the gap of the above-mentioned "clearance fit" can be zero, that is, a fitting setting; the gap of the fit can also be greater than zero, that is, a spaced setting.

[0055] In this embodiment, Figure 2 and Figure 3As shown, the stepped hole 41 includes a first hole section 411 and a second hole section 412 connected along the second direction, and the cross-sectional area of ​​the first hole section 411 is smaller than the cross-sectional area of ​​the second hole section 412; the stepped block 51 includes a first block 511 and a second block 512 connected along the second direction, and the cross-sectional area of ​​the first block 511 along the second direction is smaller than the cross-sectional area of ​​the second block 512 along the second direction, and the second block 512 is clearance-fitted with the middle surface 413, thereby forming a two-step sliding fitting structure, and the slider component 4 is limited along the second direction by the second block 512. The parts structure is simple and easy to manufacture, which can reduce production costs.

[0056] In some embodiments not shown, the stepped hole 41 may be a three-step hole, a four-step hole, etc., and / or the limiting component 5 may be a three-step block, a four-step block, etc.

[0057] In one embodiment, Figure 2 and Figure 3 As shown, the first hole segment 411 and the second hole segment 412 are both waist-round holes; and / or, the first block 511 and the second block 512 are both waist-round blocks.

[0058] Specifically, the first hole segment 411 and the second hole segment 412 are both waist-round holes extending along the first direction; the first block 511 and the second block 512 are both waist-round blocks extending along the first direction.

[0059] In this embodiment, the first hole section 411 and the second hole section 412 are both waist-round holes, which are clearance-matched with the first block 511 and the second block 512, both of which are waist-round blocks, respectively, so that the limiting component 5 can slide back and forth along the first direction and limit the amount of shaking of the limiting component 5 along the third direction, thereby improving the stability of the reciprocating motion of the slider component 4.

[0060] In one embodiment, Figure 2 and Figure 3 As shown, the cross section of the first hole segment 411 along the second direction is proportional to the cross section of the second hole segment 412 along the second direction; and / or the cross section of the first block 511 along the second direction is proportional to the cross section of the second block 512 along the second direction.

[0061] It needs to be explained that the “proportional setting” mentioned above means that the appearance is reduced or enlarged according to a certain proportion, that is, the appearance is similarly designed.

[0062] It should also be noted that the ratio of the first hole segment 411 to the second hole segment 412 can be the same as or different from the ratio of the first block 511 to the second block 512; preferably, the gap between the first block 511 and the first hole segment 411 is the same as the gap between the second block 512 and the second hole segment 412.

[0063] In this embodiment, the cross-section of the first hole segment 411 along the second direction is proportional to the cross-section of the second hole segment 412 along the second direction. Correspondingly, the cross-section of the first block 511 along the second direction is proportional to the cross-section of the second block 512 along the second direction, which can ensure the uniformity of the gap between the slider component 4 and the limiting component 5, reduce local uneven wear, and increase the service life of the slider component 4 or the limiting component 5.

[0064] In a specific embodiment, Figure 2 As shown, the fitting clearance between the first block 511 and the first hole segment 411 along the third direction is greater than zero; and / or, the fitting clearance between the second block 512 and the second hole segment 412 along the third direction is greater than zero; and / or, the fitting clearance between the second block 512 and the middle surface 413 is greater than zero.

[0065] Specifically, the fitting clearance between the first block 511 and the first hole segment 411 along the third direction can be 0.3mm~1mm, preferably, it can be any one of 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm and 1mm. Of course, it can also be selected and adjusted according to actual needs; the fitting clearance between the second block 512 and the second hole segment 412 along the third direction can be 0.3mm~1mm, preferably, it can be any one of 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm and 1mm. Of course, it can also be selected and adjusted according to actual needs; the fitting clearance between the second block 512 and the middle surface 413 can be 0.3mm~1mm, preferably, it can be any one of 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm and 1mm. Of course, it can also be selected and adjusted according to actual needs.

[0066] In this embodiment, the fitting clearance between the first block 511 and the first hole section 411 along the third direction is greater than zero; and / or, the fitting clearance between the second block 512 and the second hole section 412 along the third direction is greater than zero; and / or, the fitting clearance between the second block 512 and the middle surface 413 is greater than zero, so that the slider component 4 and the limiting component 5 are set with a clearance greater than zero at all locations, which can reduce the sliding friction resistance between the slider component 4 and the limiting component 5 along the first direction when the slider component 4 is deformed by pressure, thereby facilitating the slider component 4 to move back and forth within a certain range with the second arm section 8.

[0067] In one embodiment, Figure 2 and Figure 3As shown, the anti-loosening slider device also includes a pad 6, which is fixedly arranged on the first arm section 7 and is in sliding contact with the slider component 4; specifically, the pad 6 can be a plurality of overlapping plates, and the number is selected according to the gap requirement between the first arm section 7 and the second arm section 8.

[0068] In this embodiment, the provision of the backing plate 6 can facilitate the adjustment of the uniformity of the gap between the first arm section 7 and the second arm section 8 .

[0069] In a specific embodiment, Figure 2 and Figure 3 As shown, the pad 6 is pressed onto the first arm section 7 through the limiting component 5; specifically, a through hole is provided in the middle of the pad 6 to facilitate the installation bolts of the limiting component 5 to pass through and connect with the first arm section 7, and other parts of the limiting component 5 close to the first arm section 7 are in contact with the middle of the pad 6 to press the pad 6 onto the first arm section 7.

[0070] In this embodiment, the pad 6 is pressed onto the first arm section 7 via the limiting component 5 , thereby eliminating the need for a separate fixing structure for the pad 6 , thereby simplifying the overall structure and reducing costs.

[0071] According to an embodiment of the present application, in a second aspect, a telescopic arm is provided, comprising a first arm section 7, a second arm section 8 and an anti-loosening slider device in any one of the above embodiments, wherein the second arm section 8 is slidably plugged into the first arm section 7 along a first direction; and the limiting component 5 is fixedly connected to the surface of the first arm section 7.

[0072] Specifically, the first arm section 7 can be slidably inserted into the second arm section 8, and correspondingly, the limiting component 5 is installed on the outer surface of the first arm section 7; of course, the second arm section 8 can also be slidably inserted into the first arm section 7, and correspondingly, the limiting component 5 is installed on the inner surface of the first arm section 7.

[0073] In this embodiment, since the telescopic arm includes an anti-loosening slider device, it has the same effect as the anti-loosening slider device and will not be described in detail here.

[0074] According to an embodiment of the present application, in a third aspect, a construction machine is provided, comprising the telescopic arm in the second aspect.

[0075] Specifically, the engineering machinery may be equipment such as a crane or a hoist with a telescopic arm.

[0076] In this embodiment, since the engineering machinery includes a telescopic arm, it has the same effect as the telescopic arm and will not be described in detail here.

[0077] Although the embodiments of the present application have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. An anti-loosening slider device, characterized in that: include: A slider component (4) is suitable for being arranged between a first arm section (7) and a second arm section (8) that are slidably plugged in along a first direction, and the slider component (4) is a wear-resistant block; and A limiting component (5) is adapted to be fixedly connected to the surface of the first arm section (7), and the slider component (4) is slidably connected to the limiting component (5) along the first direction.

2. The anti-loosening slider device according to claim 1, characterized in that: The slider component (4) is provided with a stepped hole (41), the limiting component (5) is a stepped block (51), and the stepped block (51) can slide back and forth in the stepped hole (41) along the first direction. The stepped block (51) cooperates with the stepped hole (41) to limit the limiting component (5) along the second direction, wherein the second direction is a direction away from the mounting surface of the limiting component (5) on the first arm section (7).

3. The anti-loosening slider device according to claim 2, characterized in that: The stepped hole (41) comprises a first hole section (411) and a second hole section (412) that are connected along the second direction, and the cross-sectional area of ​​the first hole section (411) is smaller than the cross-sectional area of ​​the second hole section (412); The step block (51) comprises a first block (511) and a second block (512) connected along the second direction, and the cross-sectional area of ​​the first block (511) along the second direction is smaller than the cross-sectional area of ​​the second block (512) along the second direction; The second block (512) is accommodated in the second hole segment (412), the second block (512) and the second hole segment (412) are clearance-matched along a third direction, the first block (511) and the first hole segment (411) are clearance-matched along the third direction, the surface connecting the first hole segment (411) and the second hole segment (412) is an intermediate surface (413), the second block (512) and the intermediate surface (413) are clearance-matched, wherein the third direction is perpendicular to both the first direction and the second direction.

4. The anti-loosening slider device according to claim 3, characterized in that: The first hole section (411) and the second hole section (412) are both waist-shaped holes; And / or, the first block (511) and the second block (512) are both waist-round blocks.

5. The anti-loosening slider device according to claim 3 or 4, characterized in that: The cross section of the first hole section (411) along the second direction is proportional to the cross section of the second hole section (412) along the second direction; And / or, the cross section of the first block (511) along the second direction is arranged in proportion to the cross section of the second block (512) along the second direction.

6. The anti-loosening slider device according to claim 3 or 4, characterized in that: The fitting clearance between the first block (511) and the first hole section (411) along the third direction is greater than zero; And / or, the fitting clearance between the second block (512) and the second hole segment (412) along the third direction is greater than zero; And / or, the fitting clearance between the second block (512) and the middle surface (413) is greater than zero.

7. The anti-loosening slider device according to any one of claims 1 to 4, characterized in that: It also includes a pad (6), which is fixedly arranged on the first arm section (7), and the pad (6) is in sliding contact with the slider component (4).

8. The anti-loosening slider device according to claim 7, characterized in that: The pad (6) is pressed onto the first arm section (7) through the limiting component (5).

9. A telescopic arm, characterized in that: include: First arm segment (7); A second arm section (8), the second arm section (8) and the first arm section (7) are slidably plugged together along the first direction; as well as According to the anti-loosening slider device according to any one of claims 1 to 8, the limiting component (5) is fixedly connected to the surface of the first arm section (7).

10. An engineering machine, characterized in that: include: The telescopic arm according to claim 9.

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