Face shovel type excavator and balanced beam lifting device thereof

Abstract

The balanced beam lifting device comprises a body, a U-shaped frame connected to the body, pulleys hinged to the two sides of the body through pin shafts correspondingly and a plurality of rope blocking assemblies arranged below the pulleys and located on the two sides of the pulleys, and hinge lugs are arranged at the bottoms of the two ends of the U-shaped frame correspondingly. The bucket body is hinged to the hinge lug through a hinge shaft, a first annular baffle is arranged in the center of the body, the body extends downwards from the top to be provided with two symmetrical transition plates, a second annular baffle and a pulley are arranged on the transition plates, the first annular baffle and the second annular baffle are arranged on the shaft face of the pin shaft in a sleeving mode, and a rope groove is formed in the periphery of the pulley in a surrounding mode. The bucket lifting steel wire rope is wound into the rope groove; the rotatable pulleys are hinged to the two sides of the body and can be automatically adjusted according to tension changes of the bucket lifting steel wire rope, so that the bucket lifting steel wire rope is evenly stressed, breakage caused by local overload is avoided, the operation stability of equipment is greatly improved, and the service life of the bucket lifting steel wire rope is greatly prolonged.

Description

Technical Field

[0001] This invention belongs to the field of excavator technology, and particularly relates to a front shovel excavator and its equal lifting beam device. Background Technology

[0002] In the working system of a front shovel excavator, the lifting beam, as a key component, is mainly used to connect the bucket body and the bucket lifting wire rope, undertaking the important function of suspending the bucket body. The lifting beam of a mining excavator is a heavy-duty welded structural component. The balancing device of the lifting beam usually adopts a grooved semi-meniscus structure, which is fixedly connected to the lifting beam body by welding. This fixed connection means that the balancing device cannot rotate, resulting in poor effectiveness in adjusting the force balance of the bucket lifting wire rope, affecting the operational stability and service life of the equipment.

[0003] At the connection between the lifting beam and the bucket body, a bushing is installed inside the hole. The bushing is fixed to the hole by molten metal welding. Although this prevents the bushing from moving, the connecting pin at this point requires operators to manually inject grease every shift. Frequent manual lubrication leads to extremely high labor intensity. In addition, a rope stop block is fixedly installed on the upper part of the lifting beam to prevent the lifting bucket wire rope from slipping out. However, due to its fixed installation, it is difficult to replace when it is worn or damaged. This not only increases maintenance costs but may also affect the normal operation of the equipment if replacement is not done in a timely manner. Summary of the Invention

[0004] To address some or all of the technical problems existing in the prior art, the present invention provides a front shovel excavator and its equal lifting beam device.

[0005] In one aspect of the present invention, a balanced lifting beam device for a front shovel excavator is provided. The balanced lifting beam device is disposed between the bucket lifting wire rope and the bucket body. The balanced lifting beam device includes a main body, a U-shaped frame connected to the main body, pulleys respectively hinged to both sides of the main body via pins, and a plurality of rope-blocking assemblies disposed below the pulleys and located on both sides of the pulleys, wherein:

[0006] The bottom of both ends of the U-shaped frame are respectively provided with hinge ears, and the bucket body is hinged to the hinge ears through a hinge shaft;

[0007] The main body has a first mounting hole through its center. Two symmetrical first annular baffles are embedded in the first mounting hole. The main body extends from the top to the bottom and has two symmetrical transition plates. A second mounting hole with an axis coinciding with the axis of the first mounting hole is opened through the transition plate. A second annular baffle is embedded in the second mounting hole. The inner walls of the first and second annular baffles are both fitted onto the shaft surface of the pin.

[0008] The inner wall of the pulley is interference-fitted with a bushing, the bushing is sleeved on the shaft surface of the pin, the pulley is disposed between the first annular baffle and the second annular baffle, and a rope groove is formed around the outer periphery of the pulley, and the bucket lifting wire rope is wound into the rope groove.

[0009] Furthermore, in the above-mentioned equal lifting beam device of the front shovel excavator, a top plate is provided between the transition plate and the main body, and a compartment is formed between the top plate, the transition plate, and the main body, with the pulley disposed within the compartment.

[0010] Furthermore, in the above-mentioned equalization lifting beam device of the front shovel excavator, the rope-blocking assembly includes a base connected to the side of the body and a rope-blocking block connected to the base by fasteners. The end face of the base is provided with a protrusion, the end face of the protrusion is provided with a threaded hole, the end face of the rope-block is provided with a groove matching the protrusion, the center of the groove is provided with a fixing hole, the protrusion is inserted into the groove, and the fastener passes through the fixing hole and is screwed into the threaded hole.

[0011] In one specific implementation, in the equalization lifting beam device of the above-mentioned front shovel excavator, a washer is provided between the fastener and the rope block.

[0012] In one specific implementation, in the equal lifting beam device of the above-mentioned front shovel excavator, the rope blocking block has an anti-interference groove at the end away from the base, and the fastener is set in the anti-interference groove.

[0013] In one specific implementation, in the equal lifting beam device of the above-mentioned front shovel excavator, limit holes are respectively opened at both ends of the pin shaft, and limit pins are inserted into the limit holes.

[0014] In one specific implementation, in the equal lifting beam device of the above-mentioned front shovel excavator, a bushing is provided between the hinge shaft and the hinge lug, and the hinge shaft and the bushing are connected without lubrication.

[0015] In one specific implementation, in the equal lifting beam device of the above-mentioned front shovel excavator, the pin and the bushing are connected without lubrication.

[0016] Furthermore, in the above-mentioned equalization lifting beam device of the front shovel excavator, symmetrical support blocks matching the pulley are arranged on both sides of the main body below the pulley.

[0017] In another aspect of the invention, a front shovel excavator is also provided, the front shovel excavator including the above-described equalizing lifting beam device.

[0018] The front shovel excavator and its equalizing lifting device of the present invention have the following advantages and positive effects:

[0019] (1) By hinged rotatable pulleys on both sides of the main body, when the excavator is working, the pulleys can automatically adjust by rotating around the pin shaft according to the change of tension of the bucket wire rope, so that the bucket wire rope is evenly stressed, avoiding local overload and breakage, greatly improving the stability of equipment operation and the service life of the bucket wire rope. Moreover, the hinge shaft and bushing, the pin shaft and bushing are all made of lubrication-free materials, eliminating the tedious operation of manual grease injection of traditional equalization devices, greatly reducing the labor intensity of operators, and reducing maintenance frequency and time costs.

[0020] (2) The rope blocking component in this invention can promptly block the deviation of the bucket lifting wire rope caused by external impact or bucket shaking, prevent it from deviating from the predetermined track, avoid equipment failure and safety accidents caused by the bucket lifting wire rope falling off, and the rope blocking block adopts a detachable design. After wear, it can be quickly replaced by simply removing the fasteners, reducing maintenance costs and downtime, and has good practicality. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for further understanding of the embodiments of the present invention and constitute a part of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0022] Figure 1 This is a structural schematic diagram of the equal lifting beam device for the front shovel excavator of the present invention;

[0023] Figure 2 yes Figure 1 Top view of the balanced lifting beam device shown;

[0024] Figure 3 It is along Figure 1 Sectional view of AA;

[0025] Figure 4 This is a schematic diagram of the rope-blocking assembly in the equalization lifting beam device of the front shovel excavator of the present invention.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1-Body, 11-Transition plate, 12-Top plate, 2-U-shaped frame, 21-Hinge, 3-Pin, 31-Limit pin, 4-Pulley, 41-Busset, 42-Rope groove, 5-Rope blocking assembly, 51-Base, 52-Rope blocking block, 53-Anti-interference groove, 54-Fastener, 55-Washer, 6-First annular baffle, 7-Second annular baffle, 8-Support block, 9-Hinge, 100-Lifting wire rope, 200-Bucket body. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0029] The balanced lifting beam device of the front shovel excavator provided by the present invention is disposed between the bucket lifting wire rope 100 and the bucket body 200, such as... Figures 1 to 4 As shown, the equalizing lifting beam device includes a main body 1, a U-shaped frame 2 connected to the main body 1, pulleys 4 respectively hinged to both sides of the main body 1 via pins 3, and multiple rope-blocking assemblies 5 located below and on both sides of the pulleys 4. The U-shaped frame 2 and the main body 1 are integrally welded. The number and specific position of the rope-blocking assemblies 5 need to be set according to the size and position of the pulleys 4 in actual use. Hinge ears 21 are respectively provided at the bottom of both ends of the U-shaped frame 2, and ear plates are provided at the top of the bucket body 200. The ear plates are hinged to the hinge ears 21 via hinge pins 9. Preferably, the ear plates... A bushing is provided between the hinge shaft and the hinge pin, and the connection between the hinge shaft and the bushing is lubrication-free. The bushing is made of a lubrication-free material, such as a self-lubricating alloy material, to ensure smooth rotation between the ear plate and the bushing without additional lubrication, reducing maintenance workload and realizing relative rotation between the device and the bucket body 200. A first mounting hole is provided through the center of the main body 1, and two mutually symmetrical first annular baffles 6 are embedded in the first mounting hole. Two mutually symmetrical transition plates 11 are provided from the top to the bottom of the main body 1. The transition plates 11 are provided with a through-hole whose axis coincides with the first... A second mounting hole is provided along the axis of the first mounting hole. A second annular baffle 7 is embedded in the second mounting hole. The inner walls of the first annular baffle 6 and the second annular baffle 7 are both fitted onto the shaft surface of the pin 3. This arrangement ensures the coaxiality of the pulley 4, making the pulley 4 more stable during rotation and reducing wear and vibration caused by installation errors. A bushing 41 is interference-fitted onto the inner wall of the pulley 4 and is fitted onto the shaft surface of the pin 3. The pulley 4 is positioned between the first annular baffle 6 and the second annular baffle 7. A rope groove 42 is formed around the outer circumference of the pulley 4 for the bucket lifting wire rope. The cable 100 is wound into the rope groove 42. The main function of the pulley 4 is to adjust the force balance of the bucket lifting wire rope 100 by its own rotation. When the mining excavator is digging and lifting, the force on the bucket lifting wire rope 100 will also change due to the constant changes in the posture and load of the bucket body 200. The pulley 4 can automatically adjust its rotation by rotating around the pin 3 under the action of the tension of the bucket lifting wire rope 100, so that the force on the bucket lifting wire rope 100 at different positions tends to be uniform, avoiding the risk of the bucket lifting wire rope 100 breaking due to excessive force in a certain section.

[0030] Furthermore, in the equal lifting beam device of the front shovel excavator of the present invention, a top plate 12 is provided between the transition plate 11 and the main body 1, and a compartment is formed between the top plate 12, the transition plate 11, and the main body 1. The pulley 4 is disposed in the compartment. The compartment structure provides good protection for the pulley 4, effectively preventing external dust, gravel, and other debris from entering or falling and impacting the pulley 4. It has a certain anti-smashing function, avoids debris from hindering or wearing the rotation of the pulley 4, and extends the service life of the pulley 4.

[0031] Furthermore, in the equalizing lifting beam device of the front shovel excavator of the present invention, the rope-blocking assembly 5 includes a base 51 fixed to the side of the body 1 and a rope-blocking block 52 connected to the base 51 by fasteners 54. The end face of the base 51 is provided with a protrusion, and the end face of the protrusion has a threaded hole. The end face of the rope-blocking block 52 has a groove matching the protrusion, and a fixing hole is provided through the center of the groove. The protrusion is inserted into the groove, and the fasteners 54 pass through the fixing hole and are screwed into the threaded hole. The installation process of the rope-blocking assembly 5 is as follows: The base 51 is fixed to the side of the body 1 by welding or bolting. The protrusion on the end face of the base 51 and the groove on the end face of the rope-blocking block 52 cooperate with each other, engaging the groove to the outer periphery of the protrusion, thus initially positioning the rope-blocking block 52. Then, the fasteners 54 are screwed into the threaded hole. After the fastener 54 passes through the fixing hole, it is screwed into the threaded hole to complete the installation of the rope-blocking assembly 5. When the rope-blocking block 52 is worn or damaged during use and needs to be replaced, simply use a tool to unscrew the fastener 54 to remove the old rope-blocking block 52, and then install the new rope-blocking block 52 according to the above installation steps. The main function of the rope-blocking assembly 5 is to prevent the bucket lifting wire rope 100 from detaching from the pulley 4 and the body 1 during operation, thus playing a safety protection role. When the bucket lifting wire rope 100 is impacted by external force or deviates due to the violent shaking of the bucket body 200, the rope-blocking block 52 can promptly block the bucket lifting wire rope 100 to prevent it from leaving the preset position, thereby preventing equipment failure and safety accidents caused by the bucket lifting wire rope 100 falling off.

[0032] In one specific embodiment, in the equal lifting beam device of the front shovel excavator of the present invention, a washer 55 is provided between the fastener 54 and the rope blocking block 52. This arrangement can increase the tightness of the connection between the rope blocking block 52 and the base 51 and effectively prevent the fastener 54 from loosening.

[0033] In one specific embodiment, in the equal lifting beam device of the front shovel excavator of the present invention, the rope blocking block 52 has an anti-interference groove 53 at the end away from the base 51, and the fastener 54 is disposed in the anti-interference groove 53. This arrangement provides installation space for the fastener 54.

[0034] In one specific embodiment, in the equal lifting beam device of the front shovel excavator of the present invention, limit holes are respectively opened at both ends of the pin shaft 3, and limit pins 31 are inserted in the limit holes. The limit pins 31 can prevent the pin shaft 3 from moving axially during use.

[0035] In one specific embodiment, in the equal lifting beam device of the front shovel excavator of the present invention, a bushing is provided between the hinge shaft 9 and the hinge lug 21. The hinge shaft 9 and the bushing are connected without lubrication. The bushing is made of a lubrication-free material, such as a self-lubricating alloy material, to ensure that the hinge shaft 9 and the bushing can rotate smoothly without additional lubrication, thereby reducing maintenance workload.

[0036] In one specific embodiment, in the equal lifting beam device of the front shovel excavator of the present invention, the pin 3 and the bushing 41 are connected without lubrication. The bushing 41 is made of a lubrication-free material, such as a self-lubricating alloy material, which ensures that the pin 3 and the bushing 41 can rotate smoothly without additional lubrication, reducing maintenance workload, and allowing the pulley 4 to rotate flexibly around the pin 3.

[0037] Furthermore, in the equalization lifting device of the front shovel excavator of the present invention, the main body 1 below the pulley 4 is symmetrically provided with support blocks 8 matching the pulley 4 on both sides.

[0038] On the other hand, the present invention also provides a front shovel excavator, which includes the above-mentioned equal lifting beam device.

[0039] The installation process of the equal lifting beam device for the front shovel excavator of the present invention is as follows:

[0040] The first annular baffle 6 and the second annular baffle 7 are simultaneously installed into the first mounting hole and the second mounting hole, respectively. The inner walls of the two pulleys 4 are pre-fitted with bushings 41 via interference fit. Then, the two pulleys 4 are respectively positioned between the first annular baffle 6 and the second annular baffle 7. After the pulleys 4 are installed, the support block 8 is welded to the body 1 below the pulleys 4, aligning the inner hole of the bushing 41 with the inner holes of the first annular baffle 6 and the second annular baffle 7. The pin 3 is then passed sequentially through the second annular baffle 7, the bushing 41, the first annular baffle 6, and the other side of the first annular baffle 6, the bushing 41, and the second annular baffle 7. After installing the two annular baffles 7, insert the limiting pins 31 into the limiting holes at both ends of the pin shaft 3 to complete the installation of this device. Then, wind the bucket lifting wire rope 100 connected to the lifting drum into the rope groove 42 to complete the connection between this device and the bucket lifting wire rope 100. After installing the wire rope, the rope blocking assembly 5 can be installed around the pulley 4. Finally, insert the ear plate at the top of the bucket body 200 into the hinge ear 21, aligning the inner hole of the ear plate with the inner hole of the hinge ear 21. Insert the hinge shaft 9 into the bushing of the hinge ear 21 and the bushing of the ear plate to complete the connection between this device and the bucket body 200.

[0041] In summary, compared with the prior art, the front shovel excavator and its equalizing lifting device of the present invention have the following advantages and positive effects:

[0042] (1) By hinged to the two sides of the main body 1, the present invention can automatically adjust the tension of the bucket lifting wire rope 100 by rotating around the pin 3 according to the tension change of the excavator, so that the bucket lifting wire rope 100 is evenly stressed, avoiding local overload and breakage, greatly improving the stability of equipment operation and the service life of the bucket lifting wire rope 100. In addition, the hinge 9 and bushing, and the pin 3 and bushing 41 are all made of lubrication-free materials, eliminating the tedious operation of manual grease injection of the traditional equalization device, greatly reducing the labor intensity of operators, and reducing the frequency of maintenance and time cost.

[0043] (2) The rope blocking component 5 in this invention can promptly block the bucket lifting wire rope 100 from deflection caused by external impact or bucket body 200 shaking, prevent it from leaving the predetermined track, avoid equipment failure and safety accidents caused by the bucket lifting wire rope 100 falling off, and the rope blocking block 52 adopts a detachable design. After wear, it can be quickly replaced by removing the fastener 54, reducing maintenance costs and downtime, and has good practicality.

[0044] It should be noted that, unless otherwise expressly specified and limited, the term "connection" or its synonyms should be interpreted broadly in this document. For example, "connection" can be a fixed connection or a detachable 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 communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. Furthermore, expressions such as "first" and "second" are merely used to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Meanwhile, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. In addition, the terms "front," "rear," "left," "right," "upper," and "lower" in this document refer to the placement states shown in the accompanying drawings.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A balanced lifting beam device for a front shovel excavator, wherein the balanced lifting beam device is disposed between the bucket lifting wire rope and the bucket body, characterized in that, The equalizing lifting beam device includes a main body, a U-shaped frame connected to the main body, pulleys respectively hinged to both sides of the main body via pins, and multiple rope-blocking assemblies disposed below the pulleys and located on both sides of the pulleys, wherein: The bottom of both ends of the U-shaped frame are respectively provided with hinge ears, and the bucket body is hinged to the hinge ears through a hinge shaft; The main body has a first mounting hole through its center. Two symmetrical first annular baffles are embedded in the first mounting hole. The main body extends from the top to the bottom and has two symmetrical transition plates. A second mounting hole with an axis coinciding with the axis of the first mounting hole is opened through the transition plate. A second annular baffle is embedded in the second mounting hole. The inner walls of the first and second annular baffles are both fitted onto the shaft surface of the pin. The inner wall of the pulley is interference-fitted with a bushing, the bushing is sleeved on the shaft surface of the pin, the pulley is disposed between the first annular baffle and the second annular baffle, and a rope groove is formed around the outer periphery of the pulley, and the bucket lifting wire rope is wound into the rope groove.

2. The equal lifting beam device for a front shovel excavator according to claim 1, characterized in that, A top plate is provided between the transition plate and the main body, and a compartment is formed between the top plate, the transition plate, and the main body. The pulley is disposed in the compartment.

3. The equal lifting beam device for a front shovel excavator according to claim 1, characterized in that, The rope-blocking assembly includes a base connected to the side of the main body and a rope-blocking block connected to the base by fasteners. The end face of the base is provided with a protrusion and a threaded hole is provided on the end face of the protrusion. The end face of the rope-blocking block is provided with a groove that matches the protrusion. A fixing hole is provided through the center of the groove. The protrusion is inserted into the groove, and the fastener passes through the fixing hole and is screwed into the threaded hole.

4. The equal lifting beam device for a front shovel excavator according to claim 3, characterized in that, A washer is provided between the fastener and the rope-blocking block.

5. The equal lifting beam device for a front shovel excavator according to claim 3, characterized in that, The rope-blocking block has an anti-interference groove at the end away from the base, and the fastener is set in the anti-interference groove.

6. The equal lifting beam device for a front shovel excavator according to claim 1, characterized in that, Limiting holes are respectively opened at both ends of the pin, and a limiting pin is inserted into the limiting hole.

7. The equal lifting beam device for a front shovel excavator according to claim 1, characterized in that, A bushing is provided between the hinge shaft and the hinge lug, and the connection between the hinge shaft and the bushing is lubrication-free.

8. The equal lifting beam device for a front shovel excavator according to claim 1, characterized in that, The pin and the bushing are connected without lubrication.

9. The equal lifting beam device for a front shovel excavator according to claim 1, characterized in that, Symmetrical support blocks matching the pulley are arranged on both sides of the main body below the pulley.

10. A front shovel excavator, characterized in that, The front shovel excavator includes the balanced lifting beam device as described in any one of claims 1-9.

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