A connecting device for excavators and an excavator

Abstract

The present invention provides a connection device for an excavator and an excavator, wherein the connection device comprises: a pin shaft for connecting a boom and a movable arm; a buffer member for providing a buffer force to the pin shaft; wherein the boom is inserted into the movable arm, and the pin shaft passes through the boom and the movable arm, so that the boom and the movable arm are rotatably connected; a baffle is provided on the top of the pin shaft; the buffer force is parallel to the axis of the pin shaft and faces away from the baffle. The connection device can increase the service life of the pin shaft, and can effectively reduce the possibility of fatigue fracture of the baffle, while also ensuring the reliability of the connection between the boom and the movable arm.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical connection, and in particular to a connection device used in an excavator and the excavator. Background Art

[0002] The excavator's boom is connected to the boom through a pin. During operation, the gap between the boom and the pin gradually increases due to friction and other reasons, which causes the boom to squeeze the pin, causing the pin to be subjected to axial force and jump in the axial direction.

[0003] Under long-term excavation conditions, the baffle on the pin shaft will deform due to repeated impact of axial force. When the deformation accumulates to a certain extent and exceeds the yield limit of the baffle, the baffle will suffer fatigue fracture.

[0004] After the baffle is broken, the range of movement of the pin in the axial direction will be unrestricted. If the operator fails to discover this situation in time and continues to work, the pin is likely to be disconnected under the action of the axial force, causing the connection between the boom and the bucket arm to fail, thus causing great safety hazards and economic losses. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects of the prior art and provide a connecting device and an excavator for use in an excavator, so as to solve the problem that the baffle of the pin shaft used to connect the dipper arm and the boom in the prior art is easily broken due to the impact of the axial jumping force.

[0006] In order to solve the above problems, the present invention provides: a connection device for an excavator, comprising:

[0007] A pin is used to connect the stick and the boom;

[0008] A buffer member, used for providing a buffer force to the pin shaft;

[0009] The arm is inserted into the boom, and the pin passes through the arm and the boom, so that the arm and the boom are rotatably connected;

[0010] A baffle is provided on the top of the pin shaft;

[0011] The buffer force is parallel to the axis of the pin shaft and faces away from the baffle.

[0012] As a further improvement of the above technical solution, the buffer is elastic.

[0013] As a further improvement of the above technical solution, the buffer member includes a wave spring;

[0014] The wave spring is sleeved on the pin shaft.

[0015] As a further improvement of the above technical solution, the buffer member includes a compression spring;

[0016] The compression spring is sleeved on the pin shaft.

[0017] As a further improvement of the above technical solution, the buffer member includes an elastic ring;

[0018] The elastic ring is sleeved on the pin shaft.

[0019] As a further improvement of the above technical solution, the elastic ring includes any one of a rubber ring, a TPU ring or an EVA ring.

[0020] As a further improvement of the above technical solution, a pressure cover is fixedly provided at the bottom of the pin shaft;

[0021] The buffer member abuts against the pressure cover.

[0022] As a further improvement of the above technical solution, a washer is sleeved on the pin shaft, and the washer is located between the gland and the movable arm;

[0023] The gasket and the pressure cover are respectively in contact with two ends of the buffer member.

[0024] As a further improvement of the above technical solution, the gland is fixedly connected to the pin shaft via fixing bolts.

[0025] The present invention also provides: an excavator, comprising the connecting device applied to the excavator as described above.

[0026] The beneficial effect of the present invention is as follows: the present invention provides a connection device for an excavator, comprising a pin shaft and a buffer, wherein the rotation connection between the dipper arm and the boom is realized by the pin shaft. Under the action of the buffer, the pin shaft is subjected to a buffer force parallel to the axis of the pin shaft and facing away from the baffle plate, which causes the baffle plate to be pressed against the boom to reduce the activity space of the pin shaft.

[0027] When the pin shaft is subjected to an axial spring force, the buffer force provided by the buffer member can offset part of the spring force, thereby reducing the force applied to the baffle plate and thereby reducing the degree of deformation of the baffle plate caused by the force.

[0028] The connection device can increase the service life of the pin shaft and effectively reduce the possibility of fatigue fracture of the baffle, while also ensuring the reliability of the connection between the boom and the movable arm. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 A partial cross-sectional view of a boom after connection with a dipper arm is shown;

[0031] Figure 2 Shows Figure 1 A partial enlarged view of the bottom of the center pin;

[0032] Figure 3 Shows Figure 1 Exploded view of the pin, buffer, gland and gasket;

[0033] Figure 4 A cross-sectional view of a gland is shown;

[0034] Figure 5 A cross-sectional view of a gasket is shown.

[0035] Description of main component symbols:

[0036] 1-arm; 2-boom; 3-pin; 4-buffer; 5-baffle; 6-pressure cover; 7-recessed hole; 8-flange; 9-fixing bolt; 10-gasket; 11-washer; 12-front fork; 13-pressure plate; 14-connecting bolt; 15-bottom hole. DETAILED DESCRIPTION

[0037] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0038] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0040] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0042] Embodiment 1

[0043] Excavators are one of the most common construction machinery, and their safety requirements are relatively high. Once the connection of the moving parts fails, it is likely to cause a production accident, which is extremely harmful.

[0044] In an excavator, the arm 1 and the boom 2 are the main components, and their main function is to control the digging and loading actions of the bucket. As the arm 1 and the boom 2 are movable parts, the reliability of the connection between the two is very important.

[0045] To this end, in this embodiment, a connection device applied to an excavator is proposed, which can realize the connection between the boom 1 and the arm 2 and has the advantages of high reliability and long service life.

[0046] See also Figure 1 , a connection device used in an excavator, comprising a pin shaft 3 and a buffer 4, wherein the pin shaft 3 is used to connect the dipper arm 1 and the boom 2, and the buffer 4 is used to provide a buffer force to the pin shaft 3. For easy observation, Figure 1Only parts of the arm 1 and the boom 2 are shown, and the section lines are not shown.

[0047] The arm 1 is inserted into the boom 2, and the pin 3 passes through the arm 1 and the boom 2, so that the arm 1 and the boom 2 are rotatably connected. The arm 1 and the pin 3 are rotatably connected.

[0048] A baffle plate 5 is provided on the top of the pin shaft 3. The baffle plate 5 can be fixed to the top of the pin shaft 3 by welding or screw connection.

[0049] The cross-sectional area of ​​the baffle 5 is larger than the cross-sectional area of ​​the shaft holes on the boom 1 and the movable arm 2. Thus, the baffle 5 cannot extend into the shaft holes of the boom 1 and the movable arm 2, thereby limiting the range of motion of the top of the pin 3.

[0050] The buffering force provided by the buffer member 4 to the pin shaft 3 is parallel to the axis of the pin shaft 3 and faces away from the baffle plate 5. Under the action of the buffering force, the baffle plate 5 will fit with the boom 2, so that when the arm 1 and the boom 2 are in a static state or slightly moved, the pin shaft 3 will not be displaced relative to the arm 1 and the boom 2 in the axial direction.

[0051] In this embodiment, the buffer member 4 is elastic.

[0052] Preferably, the buffer member 4 can be a wave spring. During installation, the wave spring needs to be sleeved on the pin 3.

[0053] Wave springs are full name wave springs, which are elastic elements with several peaks and valleys on a thin metal ring. Wave springs have the advantages of a wide range of stiffness, strong buffering and vibration absorption capabilities, strong impact resistance, compact size, and easy installation.

[0054] To increase the buffering force, multiple wave springs can be used. The wave springs are stacked on top of each other, with wave crests stacked on top of wave crests and wave troughs stacked on top of wave troughs. Adjacent wave springs can be fixedly connected by welding or bonding, so that the multiple wave springs are formed into one body.

[0055] like Figure 2 As shown, in order to facilitate the installation of the buffer member 4 , a pressure cover 6 may be fixedly provided at the bottom of the pin shaft 3 , wherein the buffer member 4 abuts against the pressure cover 6 .

[0056] The whole shape of the pressure cover 6 is cylindrical, and its diameter is larger than the inner diameter of each shaft hole, so that the pressure cover 6 cannot enter the shaft holes of the boom 1 and the movable arm 2, thereby limiting the range of movement of the bottom of the pin shaft 3.

[0057] In this embodiment, a baffle 5 is provided at the top of the pin 3 and a pressure cover 6 is provided at the bottom of the pin 3, so that the axial range of movement of the pin 3 is limited, thereby preventing the pin 3 from escaping from the shaft hole and causing the connection between the boom 1 and the boom 2 to fail.

[0058] It should be noted that the pin shaft 3 is not completely fixed relative to the boom 2 in the axial direction, but has a certain amount of movement space. If the pin shaft 3 is immovable relative to the boom 2 in the axial direction, then when subjected to axial spring force, the spring force cannot be effectively buffered and released, resulting in the pin shaft 3 breaking.

[0059] like Figure 4 As shown, the gland 6 may be provided with a recessed hole 7 and a flange 8, and the flange 8 wraps around the outside of the recessed hole 7. The cross section of the recessed hole 7 may be circular, and the cross section of the flange 8 may be annular, wherein the diameter of the recessed hole 7 is equal to the inner diameter of the flange 8.

[0060] When the buffer member 4 is installed, the flange 8 will abut against the buffer member 4. When the pin shaft 3 and the pressure cover 6 are connected, the bottom of the pin shaft 3 will be inserted into the concave hole 7.

[0061] like Figure 2 and Figure 3 As shown, the pressure cover 6 can be fixedly connected to the pin shaft 3 by means of a fixing bolt 9. A through hole for the fixing bolt 9 to pass through can be provided on the pressure cover 6, and a threaded hole corresponding to the fixing bolt 9 can be provided at the bottom of the pin shaft 3.

[0062] After the fixing bolt 9 passes through the through hole on the gasket 10 and the gland 6, it is inserted into the threaded hole at the bottom of the pin 3. By tightening the fixing bolt 9, the gland 6 is fixedly connected to the pin 3. For the reliability of the connection, the gland 6 and the pin 3 can be fixed by multiple fixing bolts 9.

[0063] In order to disperse and balance the force of the buffer 4 on the boom 2, a washer 11 can be sleeved on the pin 3, and the outer diameter of the washer 11 is larger than the inner diameter of each shaft hole. The washer 11 is located between the gland 6 and the boom 2, wherein the washer 11 and the gland 6 are respectively in contact with the two ends of the buffer 4.

[0064] like Figure 5 As shown, in this embodiment, a bottom hole 15 may be provided at the bottom of the gasket 11. The inner diameter of the bottom hole 15 is larger than the outer diameter of the buffer 4, and the inner diameter of the bottom hole 15 is also larger than the outer diameter of the flange 8.

[0065] like Figure 2 , Figure 3 and Figure 4 As shown, the buffer 4 is partially located in the bottom hole 15, wherein the top of the buffer 4 abuts against the bottom surface of the bottom hole 15, and the bottom of the buffer 4 abuts against the top surface of the flange 8. When the axial thrust is large, the flange 8 may extend into the bottom hole 15, squeezing the buffer 4 to cause a greater deformation, thereby generating a greater buffering force, and thus improving the buffering effect.

[0066] Reference Figure 1and Figure 2 When the excavator is in working rotation, the pin shaft 3 will be subjected to axial jumping force, and the direction of the jumping force will change with the vibration of the machine body, etc., either vertically upward or vertically downward.

[0067] The following descriptions are all made with the boom 2 as a reference system.

[0068] The pin 3 will move upward only when the direction of the jumping force is vertically upward and the magnitude of the jumping force is greater than the initial buffering force of the buffer 4. As the pin 3 moves, the gland 6 at the bottom of the pin 3 moves toward the gasket 11. At this time, the buffer 4 located between the gland 6 and the gasket 11 is deformed due to being squeezed. The greater the deformation of the buffer 4, the greater the buffering force generated. Correspondingly, the acceleration of the pin 3 will become smaller and smaller until it reaches zero. Afterwards, under the action of the buffering force, the pin 3 and the baffle 5 will return to their initial positions.

[0069] When the direction of the jumping force is vertically downward, due to the buffering force of the buffer member 4, the baffle 5 fits against the boom 2. Therefore, at this time, no relative movement will occur between the baffle 5 and the boom 2, so that no impact will occur between the baffle 5 and the boom 2.

[0070] In this embodiment, the connecting device has the following advantages:

[0071] 1. It can buffer the jumping force on the pin shaft 3, thereby reducing the possibility of fatigue fracture of the baffle 5 and extending the service life of the pin shaft 3;

[0072] 2. The elastic buffer 4 can ensure that the pin 3 can automatically return to the initial position, so that the baffle 5 is close to the boom 2, reducing the frequency of collision and impact between the baffle 5 and the boom 2;

[0073] 3. The reliability of the connection between the boom 1 and the movable arm 2 can be improved.

[0074] like Figure 1 As shown, the boom 2 includes two front forks 12 arranged in parallel, wherein the two front forks 12 may be provided with a space for accommodating the boom 1.

[0075] The two front forks 12 are provided with coaxially arranged shaft holes, and at the same time, the bucket arm 1 is also provided with a shaft hole. Wherein, the shaft holes of the front forks 12 and the bucket arm 1 are both used for installing the pin 3.

[0076] Since the arm 1 and the pin 3 are rotatably connected and the contact area between the two is large, in order to protect the arm 1, a shaft sleeve can be arranged in the shaft hole of the arm 1. Among them, the shaft sleeve and the pin 3 are clearance fit.

[0077] Reference Figure 1 and Figure 2The assembly process of the arm 1 and the boom 2 is as follows:

[0078] Insert the boom 1 between the two front forks 12; adjust the position of the boom 1 so that the axial holes of the boom 1 and the front fork 12 are in line; insert the pin 3 into the axial hole; put the washer 11 on the bottom of the pin 3, wherein the bottom hole 15 of the washer 11 faces downward; put the buffer 4 on the pin 3; install the pressure cover 6 at the bottom of the pin 3; install the fixing bolt 9, and tighten the fixing bolt 9 so that the pressure cover 6 is fixedly connected to the pin 3.

[0079] In this embodiment, a pressure plate 13 may be installed on the front fork 12 of the boom 2, wherein the pressure plate 13 may be fitted with the baffle 5 via a connecting bolt 14. The pressure plate 13 is used to press the baffle 5 so that the pressure plate 13 and the pin 3 cannot rotate.

[0080] In this embodiment, an excavator is also provided, comprising the connecting device described above.

[0081] Embodiment 2

[0082] The difference between this embodiment and the first embodiment is that the buffer member 4 can be a compression spring. During installation, the compression spring needs to be sleeved on the pin 3.

[0083] Compared with the wave spring, in this embodiment, only one compression spring is needed, which makes installation more convenient.

[0084] Embodiment 3

[0085] The difference between this embodiment and the first embodiment is that the buffer member 4 can be an elastic ring. During installation, the elastic ring needs to be sleeved on the pin 3.

[0086] In this embodiment, the elastic ring can be any one of a rubber ring, a TPU ring or an EVA ring.

[0087] The TPU ring is made of TPU as raw material.

[0088] TPU is the abbreviation of Thermoplastic polyurethanes, and its Chinese name is thermoplastic polyurethane elastomer rubber. Among them, TUP has the advantages of good elasticity, wide hardness range, wear resistance, and oil resistance.

[0089] The EVA ring is made of EVA as raw material.

[0090] EVA is the abbreviation of ethylene-vinyl acetate copolymer, and its Chinese name is ethylene-vinyl acetate copolymer. EVA has good advantages such as cushioning, shock resistance, heat insulation and moisture resistance.

[0091] In this embodiment, the buffer member 4 is made of chemical materials, which has lower cost and is more convenient to process.

[0092] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0093] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A connection device for an excavator, characterized in that: include: A pin is used to connect the stick and the boom; A buffer member, used for providing a buffer force to the pin shaft; The arm is inserted into the boom, and the pin passes through the arm and the boom, so that the arm and the boom are rotatably connected; A baffle is provided on the top of the pin shaft, and the baffle is welded and fixed to the top of the pin shaft. The buffer force is parallel to the axis of the pin shaft and faces away from the baffle. A pressure plate is provided on the movable arm, and the pressure plate is fitted with the baffle through connecting bolts. The pressure plate is used to press the baffle so that the pressure plate and the pin shaft cannot rotate; A pressure cover is fixedly provided at the bottom of the pin shaft, and a concave hole and a flange are provided on the pressure cover, and the flange is wrapped around the outside of the concave hole. The bottom end of the pin shaft is inserted into the concave hole, and the bottom end of the pin shaft abuts against the bottom wall of the concave hole. The pressure cover and the bottom of the pin shaft are fixed by a plurality of fixing bolts; A washer is sleeved on the pin shaft, and the washer is located between the pressure cover and the movable arm. A bottom hole is provided at the bottom of the washer, and the inner diameter of the bottom hole is larger than the outer diameter of the buffer, and the inner diameter of the bottom hole is larger than the outer diameter of the flange. The top end of the buffer abuts against the bottom surface of the bottom hole, and the bottom end of the buffer abuts against the top surface of the flange.

2. The connecting device for an excavator according to claim 1, characterized in that: The buffer is elastic.

3. The connecting device for an excavator according to claim 2, characterized in that: The buffer member includes a wave spring; The wave spring is sleeved on the pin shaft.

4. The connecting device for an excavator according to claim 2, characterized in that: The buffer member includes a compression spring; The compression spring is sleeved on the pin shaft.

5. The connection device for an excavator according to claim 2, characterized in that: The buffer member includes an elastic ring; The elastic ring is sleeved on the pin shaft.

6. The connecting device for an excavator according to claim 5, characterized in that: The elastic ring includes any one of a rubber ring, a TPU ring or an EVA ring.

7. An excavator, characterized in that: The invention comprises a connecting device applied to an excavator as claimed in any one of claims 1 to 6.

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