Electric excavator lower side outgoing line protection device and excavator

Abstract

The utility model discloses an electric excavator lower side outgoing line protection device and an excavator, the protection device comprises a connecting piece, a protection pipe and a fixed restraint device, in the excavator, the connecting piece is welded to an incoming line hole of a supporting ring, the protection pipe is connected with the connecting piece, a fixed seat of the fixed restraint device is welded and fixed with a walking frame beam, and the fixed seat is connected with the supporting ring. The protective pipe is fixed with the walking frame beam through a fixing and restraining device; a second cable is led out of the electric control box, and the second cable penetrates through the guide ring at the outer end of the protective pipe, penetrates through the second supporting ring and the first supporting ring, enters the supporting ring and penetrates into the current collector to be connected with a wiring pile of the current collector. According to the utility model, the exposed area between the lower side incoming line and the current collector is powerfully protected, safety accidents caused by cable damage are avoided, and the cable is especially important in severe working conditions; and moreover, the protection measures are in place, the dustproof, waterproof and anti-loosening effects are realized, and the installation, disassembly and maintenance are easy.

Description

Technical Field

[0001] The utility model relates to the technical field of construction machinery, in particular to a lower-side wire outlet protection device for an electric excavator and an excavator. Background Technique

[0002] The electric hydraulic excavator uses an electric motor as the power to drive the hydraulic main pump. According to the working condition requirements, the external power grid cable is input into the upper input line and the lower input line. The so-called upper input line and lower input line refer to the connection method between the external power grid and the electric motor. The power grid cable connected to the electric motor on the upper part of the slewing platform is called the upper input line; the cable is connected to the electric motor through the crawler frame and the current collector, which is called the lower input line. The lower input line is further divided into a side input line and a rear input line. The side input line (also called the lower-side input line) is generally located on the cab side for the driver to observe conveniently; the rear input line is located behind the crawler frame, and the external power grid is fixed with a tow wire support frame or an electric cable reel is configured to automatically wind and unwind the cable.

[0003] The existing structural layout of the lower-side input cable of the electric hydraulic excavator is as Figure 1 shown. The external power grid is input into the electric control box 2 through the first cable 1, and the second cable 4 is fixed to the electric control box 2 with the locking first nut 3. The second cable 4 output from the electric control box 2 is input into the current collector 10 through the inlet hole 5 on the support ring 7 and locked with the locking second nut 6. The inlet hole 5 is located between the lower plate 8 and the upper plate 9. The current collector 10 is composed of a dial, a hollow transmission shaft, a slip ring, a brush holder, and a carbon brush, and is a transfer station for the external power grid to be connected to the electrical system of the slewing platform through the lower crawler frame. The current collector 10 and the crawler frame are fastened with the first washer 12 and the first bolt 13; the external power grid is transmitted to the slip ring through the carbon brush installed inside the brush holder, and the internal wire outlet is connected to the slip ring terminal through the hollow transmission shaft. The cable passes through the central slewing joint 11, and the lower cable input terminal is connected to the electrical control cabinet to control the electric motor to drive the main pump. The second cable 4 enters the current collector 10 through the inlet hole 5 on the upper support ring 7. The second cable 4 is exposed outside between the outside of the inlet hole 5 and the lower surface of the upper plate 9. Under harsh working conditions, the cable is easily scratched by sharp hard objects and stones, causing the metal wire harness to be exposed, which is extremely likely to trigger a safety accident; and the second cable 4 passes through the inlet hole 5 of the support ring 7. Due to the exposure of the second cable 4 outside, when the excavator is operating, vibration and shaking will inevitably cause friction between the second cable 4 and the inlet hole 5, resulting in the exposure of the metal wire harness and extremely likely to trigger a safety accident.

[0004] Based on this situation, it is necessary to optimize and upgrade the exposure between the second cable 4 outside the inlet hole 5 and the lower surface of the upper plate 9, and between the second cable 4 and the inlet hole 5, optimize the design of the protection device for the input cable, improve the protection level, and ensure the safe and stable operation of the electric excavator. Content of the Utility Model

[0005] In view of the above defects existing in the prior art, the purpose of the present utility model is to provide a protection device for the lower-side wire outlet of an electric excavator and an excavator.

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

[0007] On the one hand, the present utility model provides a protection device for the lower-side wire outlet of an electric excavator, including a connecting piece, a protection tube, and a fixed restraint device; the connecting piece includes a first flange plate, a connecting tube, and a first support ring; the first flange plate is fixedly arranged at the end of the connecting tube, and the first support ring is fixedly arranged on the inner wall of the connecting tube; the protection tube includes a second flange plate, a base tube, a second support ring, and a guiding ring; the second flange plate is connected to the end of the base tube, the guiding ring is connected to the end of the base tube far from the second flange plate, the second support ring is arranged on the inner wall of the base tube, and the second flange plate is fixedly connected to the first flange plate; the fixed restraint device includes a fixed seat, a U-shaped bolt, and a grooved rubber ring; the grooved rubber ring is sleeved on the base tube, the U-shaped bolt is sleeved outside the grooved rubber ring, and the U-shaped bolt fixedly connects the base tube to the fixed seat.

[0008] Further, the connecting tube is welded and connected to the first flange plate by providing a first groove; a first arc transition is provided at the inner edge of the end of the connecting tube far from the first flange plate;

[0009] Specifically, the base tube is welded and connected to the second flange plate by providing a second groove;

[0010] Specifically, a second arc transition is provided at the inner edge of the end of the guiding ring far from the base tube.

[0011] Further, the base tube includes a first pipe section and a second pipe section;

[0012] Specifically, the axis of the first pipe section does not coincide with the axis of the second pipe section, and the first pipe section and the second pipe section are connected by an inclined pipe;

[0013] Specifically, the second flange plate is arranged at the end of the first pipe section; the guiding ring is arranged at the end of the second pipe section, and the second support ring is arranged on the inner wall of the second pipe section.

[0014] Further, a first wire-passing rubber ring is installed in the inner hole of the first support ring, and the outer circular part of the first wire-passing rubber ring in contact with the first support ring is sealed with glue;

[0015] Specifically, a second wire-passing rubber ring is installed in the inner hole of the second support ring, and the outer circular part of the second wire-passing rubber ring in contact with the second support ring is sealed with glue.

[0016] Furthermore, the first flange plate and the second flange plate are connected by a second washer and a second bolt; the first flange plate and the second flange plate are square flanges.

[0017] Furthermore, two oblong slots are provided on the fixed seat.

[0018] Specifically, an annular groove is provided on the outer wall of the grooved rubber ring.

[0019] Specifically, the U-bolt includes a bent arc portion and two threaded portions; the bent arc portion of the U-bolt is stuck in the annular groove of the grooved rubber ring, and the two threaded portions of the U-bolt respectively pass through the two oblong slots of the fixed seat and are fastened by a third washer and a third nut.

[0020] Furthermore, a first cut is provided on the grooved rubber ring to cut through the ring body, and a second cut is provided on the grooved rubber ring to flatten the outer wall.

[0021] On the other hand, the present utility model provides an electric excavator, which includes a crawler frame, an electric control box, and a current collector. The crawler frame includes a lower plate and an upper plate. Traveling frame beams are provided on the left and right sides of the lower plate and the upper plate. The electric control box is fixed on the outer vertical surface of one traveling frame beam. A central hole is provided on the upper plate, and a support ring is provided in the central hole. The lower end of the support ring is connected to the lower plate. An inlet hole facing the electric control box is provided between the lower plate and the upper plate of the support ring. The current collector is fixedly arranged in the support ring; it also includes an electric excavator lower side outgoing line protection device as described in one aspect above; the connecting member is welded to the inlet hole of the support ring, the protective tube is connected to the connecting member, the fixed seat of the fixed restraint device is welded and fixed to the traveling frame beam, and the protective tube is fixed to the traveling frame beam through the fixed restraint device; the electric control box leads out a second cable, and the second cable penetrates into the guide ring at the outer end of the protective tube, passes through the second support ring and the first support ring, enters the inside of the support ring, and penetrates into the current collector to be connected to the wiring post of the current collector.

[0022] Furthermore, the second cable is sealed with glue in the inner hole of the first wire passing rubber ring, and the second cable is sealed with glue in the inner hole of the second wire passing rubber ring.

[0023] The present utility model has the following beneficial effects compared with the prior art:

[0024] 1. The present utility model effectively protects the exposed area between the lower side incoming line and the current collector, avoids safety accidents caused by cable damage, and is particularly important in harsh working conditions.

[0025] 2. The protection measures of the present utility model are in place, dust-proof, waterproof, and anti-loosening, and are easy to install, disassemble and repair. Description of the Drawings

[0026] Figure 1It is a schematic layout diagram of the lower side wire outlet structure of an existing electric hydraulic excavator;

[0027] Figure 2 It is a schematic layout diagram of the lower side wire outlet structure of an electric hydraulic excavator after using the present utility model;

[0028] Figure 3 It is a simplified schematic layout diagram of the lower side wire outlet structure of an electric hydraulic excavator after using the present utility model;

[0029] Figure 4 It is a schematic structure diagram of a lower side wire outlet protection device of an electric excavator of the present utility model;

[0030] Figure 5 It is Figure 4 The schematic structure diagram of the M position in;

[0031] Figure 6 It is Figure 4 The schematic structure diagram of the N position in;

[0032] Figure 7 It is a schematic combination structure diagram of a support ring and a connecting piece in the present utility model;

[0033] Figure 8 It is a schematic structure diagram of the connecting piece in the present utility model;

[0034] Figure 9 It is Figure 8 The sectional structure schematic diagram at the A - A position in;

[0035] Figure 10 It is a schematic structure diagram of the protective tube in the present utility model;

[0036] Figure 11 It is Figure 10 The sectional structure schematic diagram at the D - D position in;

[0037] Figure 12 It is Figure 11 The sectional structure schematic diagram at the E position in;

[0038] Figure 13 It is Figure 11 The sectional structure schematic diagram at the F position in;

[0039] Figure 14 It is a schematic structure diagram of the fixed restraint device in the present utility model;

[0040] Figure 15 It is a schematic structure diagram of the fixed seat in the present utility model;

[0041] Figure 16 It is a schematic structure diagram of the grooved rubber ring in the present utility model.

[0042] In the figure: the first cable 1, the electric control box 2, the first nut 3, the second cable 4, the inlet hole 5, the second nut 6, the support ring 7, the lower plate 8, the upper plate 9, the current collector 10, the central slewing joint 11, the first washer 12, the first bolt 13, the connecting piece 14, the second washer 15, the second bolt 16, the protection tube 17, the fixed restraint device 18, the first flange plate 19, the connecting pipe 20, the first support ring 21, the second flange plate 22, the base pipe 23, the second support ring 24, the guiding ring 25, the traveling frame beam 26, the fixed seat 27, the U-shaped bolt 28, the grooved rubber ring 29, the third washer 30, the third nut 31. Specific embodiments

[0043] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0044] Embodiment 1:

[0045] Please refer to Figures 2 to 16 , a lower side wire outlet protection device for an electric excavator provided by the present invention includes a connecting piece 14, a protection tube 17, and a fixed restraint device 18.

[0046] The connecting piece 14 is as Figure 8 , Figure 9 shown, and includes a first flange plate 19, a connecting pipe 20, and a first support ring 21. The first flange plate 19 is fixedly arranged at the end of the connecting pipe 20, and the first support ring 21 is fixedly arranged on the inner wall of the connecting pipe 20; during use, the end of the connecting pipe 20 away from the first flange plate 19 is inserted into the inlet hole 5 of the electric excavator, and the connecting pipe 20 is welded to the support ring 7 of the electric excavator.

[0047] Specifically, the connecting pipe 20 is welded to the first flange plate 19 by setting a first groove, and the first groove is used to improve the fusion welding strength between the first flange plate 19 and the connecting pipe 20; the inner edge of the connecting pipe 20 at the end away from the first flange plate 19 is provided with a first arc transition to avoid damaging the second cable 4.

[0048] Specifically, the first support ring 21 is welded to the connecting pipe 20. The first support ring 21 functions as a support and is used to support the second cable 4; in order to prevent the second cable 4 from moving and wearing, a first wire passing rubber ring is installed in the inner hole of the first support ring 21, and at the same time, glue is applied to the outer circle part where the first wire passing rubber ring contacts the first support ring 21, as Figure 4 , Figure 5As shown, it also prevents muddy water and dust from entering the inside of the connecting member 14.

[0049] The protective pipe 17 is as Figure 10 , Figure 11 , Figure 12 , Figure 13 shown, and includes a second flange plate 22, a base pipe 23, a second support ring 24, and a guide ring 25. The second flange plate 22 is connected to the end of the base pipe 23, the guide ring 25 is connected to the end of the base pipe 23 away from the second flange plate 22, and the second support ring 24 is arranged on the inner wall of the base pipe 23. During use, the second flange plate 22 is connected to the first flange plate 19 by bolts, and the base pipe 23 is fixed to the traveling frame beam 26 of the electric excavator through the fixed restraint device 18.

[0050] Specifically, the base pipe 23 includes a first pipe section and a second pipe section. The axes of the first pipe section and the second pipe section do not coincide. The first pipe section and the second pipe section are connected by an inclined pipe. The second flange plate 22 is arranged at the end of the first pipe section, the guide ring 25 is arranged at the end of the second pipe section, and the second support ring 24 is arranged on the inner wall of the second pipe section. The base pipe 23 is arranged as two non-concentric pipe sections to prevent interference between the base pipe 23 and the traveling frame beam 26 of the electric excavator.

[0051] Specifically, the base pipe 23 is welded to the second flange plate 22 by providing a second bevel groove, and the second bevel groove is used to improve the fusion welding strength between the second flange plate 22 and the base pipe 23.

[0052] Specifically, the second support ring 24 is welded to the base pipe 23. The second support ring 24 functions as a bracket to support the second cable 4. To prevent the second cable 4 from moving and wearing, a second wire-passing rubber ring is installed in the inner hole of the second support ring 24, and at the same time, sealant is applied to the outer circular part where the second wire-passing rubber ring contacts the second support ring 24. As Figure 4 , Figure 6 shown, it also prevents muddy water and dust from entering the inside of the protective pipe 17.

[0053] Specifically, the guide ring 25 is welded to the base pipe 23. The guide ring 25 is a flared opening to facilitate the routing of the second cable 4. A second arc transition is provided at the inner edge of the guide ring 25 at the end away from the base pipe 23 to avoid damaging the second cable 4.

[0054] More specifically, the first flange plate 19 and the second flange plate 22 are connected by a second washer 15 and a second bolt 16. The first flange plate 19 and the second flange plate 22 are square flanges. The first flange plate 19 and the second flange plate 22 are non-load-bearing members and are not subject to large forces. Setting them as square flanges occupies less space and is also convenient for disassembly and maintenance.

[0055] Since the combination of the connecting piece 14 and the protective tube 17 forms a cantilever beam structure, it is easy to cause the second cable 4 to vibrate, resulting in the loosening of the cable joint. At the same time, it accelerates the loosening and even fracture of the second bolt 16 connecting the protective tube 17 and the connecting piece 14. Therefore, a fixed restraint device 18 is added to the outer wall of the protective tube 17, and the fixed seat 27 is welded to the traveling frame beam 26, as Figure 14 shown, so as to prevent the protective tube 17 from vibrating, thereby ensuring that the second cable 4 does not vibrate and the second bolt 16 does not loosen.

[0056] The fixed restraint device 18, as Figure 14 shown, includes a fixed seat 27, a U-shaped bolt 28, and a grooved rubber ring 29. The fixed seat 27 is provided with two oblong slots. The grooved rubber ring 29 is sleeved on the base tube 23. The outer wall of the grooved rubber ring 29 is provided with a ring groove. The U-shaped bolt 28 includes a bent arc portion and two threaded portions. The bent arc portion of the U-shaped bolt 28 is stuck in the ring groove of the grooved rubber ring 29. The two threaded portions of the U-shaped bolt 28 respectively pass through the two oblong slots of the fixed seat 27 and are fastened by a third washer 30 and a third nut 31. When in use, the fixed seat 27 is welded to the upper part of the traveling frame beam 26 of the electric excavator, and the protective tube 17 is fixed to the fixed seat 27 by using the U-shaped bolt 28, the grooved rubber ring 29, the third washer 30 and the third nut 31.

[0057] Specifically, the grooved rubber ring 29 and the U-shaped bolt 28 are connected and matched with the fixed seat 27 and fastened by a third washer 30 and a third nut 31 to hold the protective tube 17 tightly. The fixed seat 27 is welded to the upper part of the traveling frame beam 26 for the overall rooting and fixing of the fixed restraint device 18.

[0058] Specifically, the fixed seat 27 is milled with oblong slots to facilitate the adjustment of the connection between the U-shaped bolt 28 and the fixed seat 27 during installation, as Figure 15 shown.

[0059] Specifically, the grooved rubber ring 29 limits the U-shaped bolt 28 by using its own grooved structure. The grooved rubber ring 29 is provided with a first cut for cutting the body of the ring, and the grooved rubber ring 29 is provided with a second cut for flattening the outer wall. The first cut facilitates the assembly of the grooved rubber ring 29 and the protective tube 17, and the second cut facilitates the close fit of the grooved rubber ring 29 and the fixed seat 27, as Figure 16 shown; the grooved rubber ring 29 is used to compensate and adjust the fit between the U-shaped bolt 28 and the outer circular part of the protective tube 17 to prevent the protective tube 17 from vibrating during the operation of the whole machine, which may cause the second cable 4 to vibrate and result in the loosening of the connection of the second cable 4.

[0060] Embodiment 2:

[0061] Please refer to Figures 2 to 16The present embodiment provides an electric excavator, including a crawler frame, an electric control box 2, and a current collector 10. The crawler frame includes a lower plate 8 and an upper plate 9. A walking frame beam 26 is arranged on the left and right sides of the lower plate 8 and the upper plate 9. The electric control box 2 is fixed on the outer facade of a walking frame beam 26. The upper plate 9 is provided with a center hole. A support ring 7 is arranged in the center hole. The lower end of the support ring 7 is connected to the lower plate 8. The support ring 7 is provided with a wire entry hole 5 facing the electric control box 2 between the lower plate 8 and the upper plate 9. The current collector 10 is fixedly arranged in the support ring 7.

[0062] The crawler frame is also provided with a lower side wire outlet protection device of an electric excavator as described in Example 1, the connecting piece 14 is welded to the wire entry hole 5 of the support ring 7, the protective tube 17 and the connecting piece 14 are fastened by the second gasket 15 and the second bolt 16, the fixed seat 27 of the fixed restraint device 18 is welded and fixed to the walking frame beam 26, and the protective tube 17 is fixed to the walking frame beam 26 through the fixed restraint device 18, forming a complete set of interlocking protection system for the second cable 4.

[0063] The second cable 4 is connected to the electric control box 3 through the first nut 3. The second cable 4 is inserted from the guide ring 25 at the outer end of the protective tube 17, passes through the second support ring 24, the first support ring 21, enters the interior of the support ring 7, and penetrates into the collector 10 to connect to the terminal post. The second cable 4 and the collector 10 are locked with the second nut 6.

[0064] In the first support ring 21, the second cable 4 is sealed with glue to the inner hole of the first wire-passing rubber ring, and in the second support ring 24, the second cable 4 is sealed with glue to the inner hole of the second wire-passing rubber ring. Figure 4 M magnification Figure 5 、N magnification part Figure 6 As shown, the sealant is a rubber sealant, which plays a damping role to prevent the second cable 4 from vibrating and wearing due to movement, and at the same time prevents muddy water and dust from entering the connector 14 and the protective tube 17.

[0065] This embodiment provides an installation sequence, which includes inserting the second cable 4 into the protective tube 17, leaving enough length at both ends, applying glue to the first and second wire-passing rubber rings, fastening the protective tube 17 and the connector 14 through the second gasket 15 and the second bolt 16, fastening the protective tube 17 and the traveling frame beam 26 using the fixing restraint device 18, connecting the second cable 4 and the collector 10 in place, connecting the second cable 4 and the electric control box 2 in place, and completing the installation. The installation sequence may also be other sequences.

[0066] The setting of a lower side outgoing line protection device for an electric excavator effectively protects the bare leakage area between the lower side incoming line and the collector, avoiding safety accidents caused by cable damage, which is particularly important in harsh working conditions.

[0067] In this application, any components that are not elaborated on and the connection methods of various components in this application all belong to the well-known technologies in this technical field. They can be directly applied and will not be elaborated further.

[0068] In this utility model, the term "a plurality of" refers to two or more, unless otherwise clearly defined. Terms such as "installed", "connected", "joined", "fixed", etc. should all be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "joined" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0069] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this utility model and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to this utility model.

[0070] In the description of this specification, the description of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0071] The above are only the preferred embodiments of this utility model and are not used to limit this utility model. For those skilled in the art, this utility model can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of this utility model shall be included within the protection scope of this utility model.

Claims

1. An electric excavator lower side wire outlet protection device, characterized in that, It includes a connecting piece, a protective pipe, and a fixing and restraining device; The connecting piece includes a first flange plate, a connecting pipe, and a first support ring; the first flange plate is fixedly arranged at the end of the connecting pipe, and the first support ring is fixedly arranged on the inner wall of the connecting pipe; The protective pipe includes a second flange plate, a base pipe, a second support ring, and a guiding ring; the second flange plate is connected to the end of the base pipe, the guiding ring is connected to the end of the base pipe far from the second flange plate, the second support ring is arranged on the inner wall of the base pipe, and the second flange plate is fixedly connected to the first flange plate; The fixing and restraining device includes a fixing seat, a U-shaped bolt, and a grooved rubber ring; the grooved rubber ring is sleeved on the base pipe, the U-shaped bolt is sleeved outside the grooved rubber ring, and the U-shaped bolt fixedly connects the base pipe and the fixing seat.

2. The protective device for the lower-side wire outlet of an electric excavator according to claim 1, wherein The connecting pipe is welded and connected to the first flange plate by arranging a first bevel groove; a first arc transition is arranged on the inner edge of the end of the connecting pipe far from the first flange plate; The base pipe is welded and connected to the second flange plate by arranging a second bevel groove; A second arc transition is arranged on the inner edge of the end of the guiding ring far from the base pipe.

3. The lower side wire outlet protection device of an electric excavator according to claim 1, characterized in that, The base pipe includes a first pipe section and a second pipe section; The axis of the first pipe section does not coincide with the axis of the second pipe section, and the first pipe section and the second pipe section are communicated by an inclined pipe; The second flange plate is arranged at the end of the first pipe section; the guiding ring is arranged at the end of the second pipe section, and the second support ring is arranged on the inner wall of the second pipe section.

4. The protective device for cable outlet on the lower side of an electric excavator according to claim 1, characterized in that, A first wire-passing rubber ring is installed in the inner hole of the first support ring, and the outer circular part of the first wire-passing rubber ring in contact with the first support ring is sealed with glue; A second wire-passing rubber ring is installed in the inner hole of the second support ring, and the outer circular part of the second wire-passing rubber ring in contact with the second support ring is sealed with glue.

5. The protection device for the lower side wire outlet of an electric excavator according to claim 1, characterized in that, The first flange plate and the second flange plate are connected by a second washer and a second bolt; the first flange plate and the second flange plate are square flanges.

6. The protective device for the lower side wire outlet of an electric excavator according to claim 1, characterized in that, Two oblong slots are arranged on the fixing seat; A ring groove is arranged on the outer wall of the grooved rubber ring; The U-shaped bolt includes a bent arc part and two threaded parts; the bent arc part of the U-shaped bolt is stuck in the ring groove of the grooved rubber ring, and the two threaded parts of the U-shaped bolt respectively pass through the two oblong slots of the fixing seat and are fastened by a third washer and a third nut.

7. The lower side wire outlet protection device of an electric excavator according to claim 1, characterized in that, The grooved rubber ring is provided with a first cut that cuts through the body of the ring, and the grooved rubber ring is provided with a second cut that flattens the outer wall.

8. An electric excavator, including a crawler frame, an electric control box, and a current collector. The crawler frame includes a lower plate and an upper plate. Walking frame beams are arranged on the left and right sides of the lower plate and the upper plate. The electric control box is fixed on the outer vertical surface of one walking frame beam. A central hole is arranged on the upper plate, a support ring is arranged in the central hole, the lower end of the support ring is connected to the lower plate, an inlet hole facing the electric control box is arranged between the lower plate and the upper plate of the support ring, and the current collector is fixedly arranged in the support ring; It is characterized in that, It further includes a lower-side wire-out protection device for an electric excavator as described in claim 4; The connecting piece is welded to the inlet hole of the support ring, the protective pipe is connected to the connecting piece, the fixing seat of the fixing and restraining device is welded and fixed to the walking frame beam, and the protective pipe is fixed to the walking frame beam through the fixing and restraining device; The electric control box leads out a second cable, and the second cable penetrates through the guiding ring at the outer end of the protection pipe, passes through the second support ring and the first support ring, enters the interior of the support ring, and penetrates into the current collector to be connected to the wiring post of the current collector.

9. An electric excavator according to claim 8, characterized in that, The inner hole of the second cable is sealed with glue with the first cable passing rubber ring, and the inner hole of the second cable is sealed with glue with the second cable passing rubber ring.

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