Upper frame of small excavator

Abstract

The utility model relates to the technical field of excavator frames, in particular to a small excavator upper frame which comprises a top frame and a bottom frame, the top frame comprises a bearing plate, the bottom of the bearing plate is fixedly connected with a reinforcing strip and a rotating cylinder, the bottom of the rotating cylinder is fixedly connected with a second long rod, and the side face of the second long rod is slidably connected with a limiting block. The bottom frame comprises an H-shaped support, the top of the H-shaped support is fixedly connected with a fixing structure and a supporting structure, the top of the bottom frame is fixedly connected with four stand columns, the tops of the four stand columns are slidably connected with two movable plates through movable holes, and the movable plates are fixedly connected with connecting blocks through second bolts. Springs are arranged in the movable holes, the springs are elastically connected with the stand column and the movable plate, the fixing structure is used for clamping the supporting structure at the fixed position and preventing shaking, and negative pressure is not concentrated at one point any more through mutual meshing of a first gear, three second gears and a gear groove.

Description

Technical Field

[0001] The utility model relates to the technical field of excavator frames, in particular to an upper frame of a small excavator. Background Art

[0002] An excavator, also known as a backhoe, is an earth-moving machine that uses a bucket to dig materials above or below the surface of the machine and load them into a transport vehicle or unload them to a stockpile. The upper frame of an excavator is a slewing platform on a slewing bearing.

[0003] A small excavator upper frame with a public account number of CN 219118269 U authorized by China is provided. By welding fixing plates on both sides of a connecting pipe, after a first bolt fixes the fixing plate and the lower frame together, the first connecting plate is pulled downward by a first spring and can be clamped in a clamping groove on the top of the first bolt through a clamping block, thereby stabilizing the position of the first bolt and ensuring the stability of the upper and lower positions between the lower frame and the upper frame.

[0004] However, this patent still has certain shortcomings when used. When the patent is used, the connecting components of the excavator will be directly exposed to the air when working. When exposed to air erosion for a long time, the components will rust and are not easy to separate and replace. It has limitations. During long-term use, the rotating components will rotate abnormally due to lack of lubrication, thus affecting the normal operation of the excavator. During the rotation of the excavator, the rotation occasionally reverses, which will affect the time and efficiency of the operation. The traditional excavator uses a single star gear for rotation, and the single star gear uses point contact during the rotation process. The load is concentrated at a certain point. Over time, the tooth surface is prone to deformation and wear, which leads to rotation failure. Utility Model Content

[0005] The purpose of the utility model is to provide a small excavator upper frame to solve the problems raised in the above background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A small excavator upper frame includes a top frame and a bottom frame, the top frame includes a load-bearing plate, the bottom of the load-bearing plate is fixedly connected with a reinforcement bar and a rotating cylinder respectively, the bottom of the rotating cylinder is provided with a groove, the bottom of the rotating cylinder is fixedly connected with a second long rod, the side of the second long rod is slidably connected with a limiting block, the center of the limiting block is provided with a small hole, the bottom of the second long rod is fixedly connected with a second gear, the bottom frame includes an H-shaped bracket, the top of the H-shaped bracket is fixedly connected with a fixing structure, the top of the H-shaped bracket is provided with a first threaded hole, and the top of the H-shaped bracket is provided with a supporting structure.

[0008] As a preferred solution of the utility model, a motor is arranged at the bottom of the H-shaped bracket, and a gear rod is fixedly connected to the output end of the motor.

[0009] As a preferred solution of the present utility model, the gear rod includes a first long rod, and a first gear is fixedly connected to the center of the first long rod.

[0010] As a preferred solution of the utility model, a gear groove is provided at the center of the H-shaped bracket, an annular groove is provided at the bottom of the gear groove, and a second rotating ball is slidably connected to the inner bottom of the annular groove.

[0011] As a preferred solution of the utility model, the top of the bottom frame is fixedly connected with four columns, the tops of the four columns are slidably connected with two movable plates through movable holes, the movable plates are fixedly connected with connecting blocks through second bolts, and springs are arranged inside the movable holes, which elastically connect the columns and the movable plates.

[0012] As a preferred solution of the utility model, the support structure is fixedly connected to the H-shaped bracket by a first bolt, and the top of the support structure is rotatably connected to a first rotating bead, and the first rotating bead is rotatably connected to the groove.

[0013] As a preferred solution of the present utility model, the number of the second gears is set to three, the second gears are rotationally connected to the gear grooves, and the second gears are rotationally connected to the first gears.

[0014] As a preferred solution of the utility model, the gear rod extends to the top of the limit block through the H-shaped bracket, and the gear rod and the limit block are slidably connected.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. In the utility model, the support structure is fixed to the bottom frame by a first bolt, and a movable plate, a movable hole, a column, a second bolt and a connecting block are used in coordination, a spring is provided in the movable hole, and the spring elastically connects the movable plate and the column. First, the two movable plates are slid to both sides along the movable hole, and after the support structure is fixed, the movable plate is reset to clamp the support structure, and then the second bolt is tightened on the movable plate, thereby fixing the support structure to the bottom frame.

[0017] 2. In the present invention, the second long rod, the stopper, the second gear, the gear slot, the motor and the gear rod are used in coordination. The stopper limits the positions of the three second long rods and the gear rod. The motor drives the gear rod to rotate, and the gear rod drives the second gear to rotate in the gear slot. This rotation method can disperse the negative pressure to prevent damage caused by the concentration of negative pressure. A second rotating bead is installed in the annular groove at the bottom of the gear slot. The top of the second rotating bead slides and contacts the bottom of the second gear, thereby reducing the friction generated during the rotation process. When the rotation is difficult due to friction, lubricating oil can be added to the annular groove to reduce the friction generated. The top of the support structure is provided with a first rotating bead. The support structure is clamped together by the first rotating bead and the groove opened at the bottom of the rotating cylinder, which is used to reduce the friction between the rotating cylinder and the support structure during rotation. . BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an explosion diagram of the utility model;

[0019] Figure 2 It is an overall schematic diagram of the utility model;

[0020] Figure 3 This is a schematic diagram of the fixed structure of the utility model;

[0021] Figure 4 This is a schematic diagram of the interior of the bottom frame groove of the utility model;

[0022] Figure 5 It is a schematic diagram of the bottom of the top frame of the utility model.

[0023] In the figure: 1. top frame; 2. first rotating bead; 3. supporting structure; 4. first bolt; 5. gear rod; 6. fixing structure; 7. bottom frame; 8. motor; 9. first threaded hole; 101. load-bearing plate; 102. reinforcement strip; 103. rotating cylinder; 104. groove; 105. second long rod; 106. limit block; 107. second gear; 108. small hole; 501. first long rod; 502. first gear; 601. movable plate; 602. movable hole; 603. column; 604. second bolt; 605. connecting block; 701. H-shaped bracket; 702. gear groove; 703. annular groove; 704. second rotating bead. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0025] For examples, see Figure 1-5 , the utility model provides a technical solution:

[0026] A small excavator upper frame includes a top frame 1 and a bottom frame 7, the top frame 1 includes a load-bearing plate 101, the bottom of the load-bearing plate 101 is respectively fixedly connected with a reinforcement strip 102 and a rotating cylinder 103, a groove 104 is provided at the bottom of the rotating cylinder 103, a second long rod 105 is fixedly connected to the bottom of the rotating cylinder 103, the side of the second long rod 105 is slidably connected to a limit block 106, a small hole 108 is provided at the center of the limit block 106, a second gear 107 is fixedly connected to the bottom of the second long rod 105, and the bottom frame 7 includes an H-shaped bracket 701, the top of the H-shaped bracket 701 is fixedly connected with a fixing structure 6, the top of the H-shaped bracket 701 is provided with a first threaded hole 9, and the top of the H-shaped bracket 701 is provided with a supporting structure 3.

[0027] In this embodiment, Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, four columns 603 are fixedly connected to the top of the bottom frame 7, and two movable plates 601 are slidably connected to the top of the four columns 603 through movable holes 602. The movable plates 601 are fixedly connected to the connecting blocks 605 through second bolts 604. A spring is arranged inside the movable hole 602, and the spring elastically connects the columns 603 and the movable plates 601.

[0028] Among them, the support structure 3 is fixed to the bottom frame 7 by the first bolt 4, and the movable plate 601, the movable hole 602, the column 603, the second bolt 604 and the connecting block 605 are used in coordination, and a spring is provided in the movable hole 602, and the spring elastically connects the movable plate 601 and the column 603. First, the two movable plates 601 are slid to both sides along the movable hole 602. After the support structure 3 is fixed, the movable plate 601 is reset to clamp the support structure 3, and then the second bolt 604 is tightened on the movable plate 601, so that the support structure 3 is fixed to the bottom frame 7.

[0029] In this embodiment, Figure 1 , Figure 2 and Figure 3As shown, a motor 8 is provided at the bottom of the H-shaped bracket 701, and a gear rod 5 is fixedly connected to the output end of the motor 8. The gear rod 5 includes a first long rod 501, and a first gear 502 is fixedly connected to the center of the first long rod 501. A gear groove 702 is opened at the center of the H-shaped bracket 701, and an annular groove 703 is opened at the bottom of the gear groove 702. The inner bottom of the annular groove 703 is slidably connected with a second rotating bead 704. The support structure 3 is fixedly connected to the H-shaped bracket 701 through a first bolt 4. The top of the support structure 3 is rotatably connected with the first rotating bead 2, and the first rotating bead 2 is rotatably connected to the groove 104. The number of second gears 107 is set to three, the second gear 107 is rotatably connected to the gear groove 702, and the second gear 107 is rotatably connected to the first gear 502. The gear rod 5 extends through the H-shaped bracket 701 to the top of the limit block 106, and the gear rod 5 is slidably connected to the limit block 106.

[0030] Among them, through the coordinated use of the second long rod 105, the limit block 106, the second gear 107, the gear slot 702, the motor 8 and the gear rod 5, the limit block 106 limits the positions of the three second long rods 105 and the gear rod 5, the motor 8 drives the gear rod 5 to rotate, and the gear rod 5 drives the second gear 107 to rotate in the gear slot. This rotation method can disperse the negative pressure to prevent the damage caused by the concentration of negative pressure at one point. The second rotating bead 704 is installed in the annular groove 703 at the bottom of the gear slot 702. The top of the second rotating bead 704 slides and contacts the bottom of the second gear 107, thereby reducing the friction generated during the rotation process. When the rotation is difficult due to friction, lubricating oil can be added to the annular groove 703 to reduce the friction generated. The top of the support structure 3 is provided with a first rotating bead 2. The support structure 3 is clamped together by the first rotating bead 2 and the groove 104 opened at the bottom of the rotating cylinder 103, which is used to reduce the friction between the rotating cylinder 103 and the support structure 3 during rotation.

[0031] The working process of the utility model is as follows: when the upper frame of a small excavator designed by the present invention is working, the gear rod 5 is first installed on the inner bottom of the bottom frame 7, the bottom of the gear rod 5 passes through the bottom frame 7 and extends to the bottom of the bottom frame 7, one end of the gear rod 5 is connected to the motor, and the other end can be stuck in the small hole 108, and then the movable plate 601 is pulled to both sides to facilitate the installation of the support structure 3, and the support structure 3 is fixed by the first bolt 4 on the top of the bottom frame 7. After the fixing is completed, the movable plate 601 is reset under the action of the spring, so that the two movable plates 601 are combined, and the connecting block 605 and the movable plate 601 are fixed with the second bolt 604, so that the support structure 3 is stuck in a fixed position, and then the gear rod composed of three second long rods 105 and the second gear 107 is fixed to the bottom of the rotating cylinder 103. The three gear rods are limited by the limit block 106, and the bottom of the assembled top frame 1 is installed on the top of the bottom frame 7, so that the groove 104 of the top frame 1 is aligned with the first rotating bead 2 on the top of the supporting structure 3 for installation. After the assembly is completed, the switch of the motor 8 is turned on, and the motor 8 drives the first long rod 501 and the first gear 502 to rotate. Since the second gear 107 is respectively engaged with the first gear 502 and the gear groove 702, the second gear 107 is driven to rotate when the gear rod 5 rotates, and the second gear 107 drives the second long rod 105 to rotate, thereby driving the entire top frame 1 to rotate. During rotation, the first rotating bead 2 rotates at the top of the supporting structure 3 and in the groove 104, and the second gear 107 and the inner bottom of the gear groove 702 are also connected through the second rotating bead 704, thereby effectively reducing the friction generated during the rotation process.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A small excavator upper frame, comprising a top frame (1) and a bottom frame (7), characterized in that: The top frame (1) comprises a load-bearing plate (101), the bottom of the load-bearing plate (101) being fixedly connected to a reinforcement strip (102) and a rotating cylinder (103), the bottom of the rotating cylinder (103) being provided with a groove (104), the bottom of the rotating cylinder (103) being fixedly connected to a second long rod (105), the side of the second long rod (105) being slidably connected to a limit block (106), the center of the limit block (106) being provided with a small hole (108), the bottom of the second long rod (105) being fixedly connected to a second gear (107), and the bottom frame (7) comprising an H-shaped bracket (701), the top of the H-shaped bracket (701) being fixedly connected to a fixing structure (6), the top of the H-shaped bracket (701) being provided with a first threaded hole (9), and the top of the H-shaped bracket (701) being provided with a supporting structure (3).

2. The small excavator upper frame according to claim 1, characterized in that: A motor (8) is provided at the bottom of the H-shaped bracket (701), and a gear rod (5) is fixedly connected to the output end of the motor (8).

3. The small excavator upper frame according to claim 2, characterized in that: The gear rod (5) comprises a first long rod (501), and a first gear (502) is fixedly connected to the center of the first long rod (501).

4. The small excavator upper frame according to claim 1, characterized in that: A gear groove (702) is provided at the center of the H-shaped bracket (701), an annular groove (703) is provided at the bottom of the gear groove (702), and a second rotating bead (704) is slidably connected to the inner bottom of the annular groove (703).

5. The small excavator upper frame according to claim 1, characterized in that: The top of the bottom frame (7) is fixedly connected to four upright posts (603); the tops of the four upright posts (603) are slidably connected to two movable plates (601) via movable holes (602); the movable plates (601) are fixedly connected to connecting blocks (605) via second bolts (604); a spring is provided inside the movable hole (602); the spring elastically connects the upright posts (603) and the movable plates (601).

6. The small excavator upper frame according to claim 1, characterized in that: The support structure (3) is fixedly connected to the H-shaped bracket (701) via a first bolt (4); the top of the support structure (3) is rotatably connected to a first rotating bead (2); and the first rotating bead (2) is rotatably connected to the groove (104).

7. The small excavator upper frame according to claim 1, characterized in that: The number of the second gears (107) is set to three, the second gears (107) are rotationally connected to the gear slot (702), and the second gears (107) are rotationally connected to the first gear (502).

8. The small excavator upper frame according to claim 2, characterized in that: The gear rod (5) extends to the top of the limit block (106) through the H-shaped bracket (701), and the gear rod (5) and the limit block (106) are slidably connected.

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