Bucket rod telescoping mechanism and loader-digger

Abstract

The bucket rod telescopic mechanism comprises a movable bucket rod and a static bucket rod, a telescopic groove is formed in the static bucket rod, and a telescopic oil cylinder for driving the movable bucket rod to move along the telescopic groove is further arranged on the static bucket rod. A plurality of rolling mechanisms are arranged at the bottom of the telescopic groove in the telescopic direction of the movable bucket rod. The rolling mechanism is arranged at the bottom of the telescopic groove of the fixed bucket rod, so that when the telescopic oil cylinder drives the movable bucket rod to stretch out and draw back, the movable bucket rod can be slightly jacked up, original sliding friction between the movable bucket rod and the fixed bucket rod is changed into rolling friction between the movable bucket rod and the rolling wheel, and therefore friction abrasion between the movable bucket rod and the fixed bucket rod is reduced; the limiting groove is matched with the top of the rolling wheel, so that the bottom face of the movable bucket rod can be completely attached to the bottom face of the telescopic groove, low friction during sliding is guaranteed, full contact of the static bucket rod and the movable bucket rod during normal operation is guaranteed, and stability and safety of the whole structure are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of loaders, in particular to a bucket arm telescopic mechanism and an excavator loader. Background Art

[0002] The boom extension mechanism is used by backhoe loaders to adjust the length of the bucket arm, thereby adjusting the working range of the backhoe bucket and the depth of excavation. Currently, the most common telescopic structure mainly consists of two booms spliced ​​together. The telescopic cylinder on one boom drives the other boom to extend and retract to extend the boom arm. For example, CN200910025795.0 describes a pull-out structure of two booms when they are in contact. This structure has the advantages of being simple, stable and reliable. However, this boom coupling method has the disadvantage of a large contact area between the two booms, which generates significant friction during extension and retraction, significantly increasing wear between the booms and shortening their service life. Utility Model Content

[0003] In order to overcome the defects of the prior art, the technical problem to be solved by the present invention is to propose a boom telescopic mechanism and an excavator loader, which reduces friction and wear during telescopic movement and increases service life by setting a rolling friction structure between the two booms.

[0004] To achieve this purpose, the present invention adopts the following technical solutions:

[0005] The utility model provides a boom telescopic mechanism, comprising a movable boom and a stationary boom, wherein the stationary boom is provided with a telescopic slot, and the stationary boom is further provided with a telescopic oil cylinder for driving the movable boom to move along the telescopic slot, and the bottom of the telescopic slot is provided with a plurality of rolling mechanisms along the telescopic direction of the movable boom; the rolling mechanisms include a plurality of rollers, the axes of the rollers being perpendicular to the telescopic direction of the movable boom, the rollers being rotatably connected to the bottom of the telescopic slot, and the number of the rollers being at least two to ensure stability during telescoping; The height by which the top of the roller protrudes from the bottom of the telescopic slot is h, and the height h by which the top of the roller protrudes from the bottom of the telescopic slot is in the range of 1 to 2 mm; a limiting groove is also provided at the bottom of the movable boom for cooperating with the top of the roller, and when the limiting groove and the top of the roller cooperate, the bottom surface of the movable boom and the bottom surface of the telescopic slot are against each other; in this way, when telescoping, the sliding friction of the movable boom and the static boom changes to rolling friction, which can greatly reduce wear, while ensuring full contact and normal operation during normal operation.

[0006] When the telescopic cylinder is set, the tail end of the telescopic cylinder is hinged to the telescopic slot near one end of the frame, the piston end of the telescopic cylinder is hinged to the dynamic bucket rod, and a hydraulic oil block is also provided on the telescopic cylinder to supply oil to the telescopic cylinder.

[0007] During telescoping, the stability of the telescoping must be ensured, so it cannot be constrained only by the telescopic cylinder, that is, the static bucket arm is fixed with a guide block at one end of the telescopic slot near the bucket, and a guide opening is opened on the guide block, and the guide opening is V-shaped. Guide strips that cooperate with the guide opening are fixed on both sides of the dynamic bucket arm, and the guide strips and the guide opening are slidably connected. Here, the cooperation between the guide strips and the guide opening must be adapted to the height h of the top of the roller protruding from the bottom of the telescopic slot.

[0008] After the extension and retraction is completed, it is necessary to tighten it to fix the overall length position of the bucket arm. The static bucket arm is also provided with several sets of fastening nuts and fastening bolts on both sides near one end of the bucket.

[0009] The beneficial effects of the utility model are:

[0010] The utility model provides a rolling mechanism at the bottom of the telescopic groove of the static bucket arm, so that when the telescopic cylinder drives the dynamic bucket arm to extend and retract, the dynamic bucket arm can be slightly lifted up, so that the sliding friction between the dynamic bucket arm and the static bucket arm is changed into rolling friction between the roller, which reduces the friction and wear between the dynamic bucket arm and the static bucket arm. Moreover, when the dynamic bucket arm is extended and retracted into place, the limit groove and the top of the roller cooperate so that the bottom surface of the dynamic bucket arm and the bottom surface of the telescopic groove can be completely in contact with each other, and then the position is fixed by using the fastening nut and the fastening bolt. In this way, low friction is guaranteed during sliding, and full contact between the static bucket arm and the dynamic bucket arm is guaranteed during normal operation, thereby ensuring the stability and safety of the overall structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the arm telescopic mechanism provided in a specific embodiment of the present utility model when it is installed on a vehicle frame in a retracted state;

[0012] Figure 2 This is a structural diagram of the arm telescopic mechanism provided in a specific embodiment of the present invention when it is installed on a vehicle frame in an extended state;

[0013] Figure 3 This is a structural diagram of the arm telescopic mechanism provided in a specific embodiment of the present utility model in an extended state;

[0014] Figure 4 This is a structural schematic diagram of the arm telescopic mechanism provided in a specific embodiment of the present invention in an extended state from another perspective;

[0015] Figure 5 This is a structural diagram of the arm telescopic mechanism in a retracted state provided in a specific embodiment of the present utility model;

[0016] Figure 6This is a schematic diagram of the structure of the boom telescopic mechanism provided in a specific embodiment of the present invention when it is in an extended state from a top perspective;

[0017] Figure 7 This is a structural schematic diagram of the bottom perspective of the boom telescopic mechanism provided in a specific embodiment of the present invention when it is in an extended state;

[0018] Figure 8 This is a schematic structural diagram of a static bucket arm provided in a specific embodiment of the present utility model;

[0019] Figure 9 This is a schematic diagram of the principle of the static bucket arm and the dynamic bucket arm provided in a specific embodiment of the utility model when they are static;

[0020] Figure 10 This is a schematic diagram of the principle of the arm telescopic mechanism provided in a specific embodiment of the utility model when it is extended and retracted;

[0021] In the picture:

[0022] 1. Moving arm; 11. Guide strip; 12. Limiting groove;

[0023] 2. Static arm; 21. Telescopic slot; 22. Rolling mechanism; 221. Roller; 23. Guide block; 231. Guide opening; 24. Fastening nut; 25. Fastening bolt;

[0024] 3. Telescopic cylinder; 31. Hydraulic oil block. DETAILED DESCRIPTION

[0025] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0026] like Figures 1 to 7 As shown, the utility model provides a boom telescopic mechanism, including a movable boom 1 and a static boom 2, as shown in FIG. Figure 6 The movable arm 1 is moved along the expansion slot 21 by the guide bar 23 and the guide bar 11 is slidably connected to the movable arm 1. Figure 8As shown, the bottom of the telescopic groove 21 is provided with several groups of rolling mechanisms 22 along the telescopic direction of the movable bucket arm 1; the rolling mechanism 22 includes several rollers 221, the axis of the roller 221 is perpendicular to the telescopic direction of the movable bucket arm 1, the roller 221 is rotatably connected to the bottom of the telescopic groove 21, the top of the roller 221 protrudes from the bottom of the telescopic groove 21 by a height h, and the height h of the top of the roller 221 protruding from the bottom of the telescopic groove 21 ranges from 1 to 2 mm; the bottom of the movable bucket arm 1 is also provided with a limiting groove 12 that cooperates with the top of the roller 221. When the limiting groove 12 and the top of the roller 221 cooperate, the bottom surface of the movable bucket arm 1 and the bottom surface of the telescopic groove 21 are offset; as shown Figure 9 and Figure 10 As shown, when the telescopic cylinder 3 drives the movable bucket rod 1 to extend and retract, the movable bucket rod 1 is slightly lifted up. At the same time, in order to ensure stability during extension and retraction, the number of rollers 221 includes at least two. The sliding friction between the original and the static bucket rod 2 is changed to rolling friction between the rollers 221. This can facilitate the telescopic cylinder 3 to drive the movable bucket rod 1 to extend and retract, and also reduce the friction and wear between the movable bucket rod 1 and the static bucket rod 2. Furthermore, when the movable bucket rod 1 is extended and retracted into place, the limit groove 12 and the top of the roller 221 cooperate, so that the bottom surface of the movable bucket rod 1 and the bottom surface of the telescopic groove 21 can be completely attached to each other. At the same time, the static bucket rod 2 is close to the movable bucket rod 1. Several groups of fastening nuts 24 and fastening bolts 25 are also provided on both sides of one end of the bucket, so that the position of the dynamic boom 1 can be fixed by the fastening nuts 24 and fastening bolts 25 to complete the extension and retraction of the entire boom length; it should be further explained that, due to the implementation of this scheme, the dynamic boom 1 will be slightly lifted up during the extension and retraction process, so the guide bar 11 and the guide mouth 231 are not completely in contact with each other, and need to be adapted to the height h of the top of the roller 221 protruding from the bottom of the telescopic groove 21, that is, leaving a certain margin, which can not only ensure the stability of the structure, but also ensure the normal extension and retraction of the dynamic boom 1.

[0027] A backhoe loader adopts the above-mentioned boom extension mechanism, which can reduce the friction between the dynamic boom 1 and the static boom 2 when the dynamic boom 1 is extended and retracted to adjust the boom length, thereby reducing the wear between the two and ensuring the service life of the boom.

[0028] The present invention is described through preferred embodiments. Those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. The present invention is not limited to the specific embodiments disclosed herein, and other embodiments falling within the scope of the claims of this application are also within the scope of protection of the present invention.

Claims

1. A boom telescopic mechanism, comprising a movable boom (1) and a stationary boom (2), wherein the stationary boom (2) is provided with a telescopic slot (21), and the stationary boom (2) is further provided with a telescopic oil cylinder (3) for driving the movable boom (1) to move along the telescopic slot (21), characterized in that: The bottom of the telescopic groove (21) is evenly provided with a plurality of rolling mechanisms (22) along the telescopic direction of the movable arm (1).

2. The arm telescopic mechanism according to claim 1, characterized in that: The rolling mechanism (22) includes a plurality of rollers (221), the axes of the rollers (221) are perpendicular to the telescopic direction of the movable boom (1), the rollers (221) are rotatably connected to the bottom of the telescopic slot (21), the top of the rollers (221) protrudes from the bottom of the telescopic slot (21) by a height h, and the bottom of the movable boom (1) is further provided with a limiting slot (12) that cooperates with the top of the rollers (221). When the limiting slots (12) and the top of the rollers (221) cooperate, the bottom surface of the movable boom (1) and the bottom surface of the telescopic slot (21) are abutted.

3. The arm telescopic mechanism according to claim 2, characterized in that: The number of the rollers (221) is at least two.

4. The arm telescopic mechanism according to claim 3, characterized in that The height h of the top of the roller (221) protruding from the bottom of the telescopic slot (21) is in the range of 1 to 2 mm.

5. The arm telescopic mechanism according to claim 2, characterized in that: The rear end of the telescopic oil cylinder (3) is hinged to the telescopic slot (21) near one end of the vehicle frame, the piston end of the telescopic oil cylinder (3) is hinged to the movable arm (1), and a hydraulic oil block (31) is also provided on the telescopic oil cylinder (3) to supply oil to the telescopic oil cylinder (3).

6. The arm telescopic mechanism according to claim 5, characterized in that: The static bucket arm (2) is fixedly provided with a guide block (23) at one end of the telescopic slot (21) close to the bucket, and a guide opening (231) is provided on the guide block (23), and the guide opening (231) is V-shaped. Guide strips (11) that cooperate with the guide opening (231) are fixedly provided on both sides of the dynamic bucket arm (1), and the guide strips (11) and the guide opening (231) are slidably connected.

7. The arm telescopic mechanism according to claim 1, characterized in that: The static bucket rod (2) is also provided with a plurality of sets of fastening nuts (24) and fastening bolts (25) on both sides close to one end of the bucket.

8. A backhoe loader, characterized in that: The boom telescopic mechanism according to any one of claims 1 to 7 is adopted.

Images