Crawler excavator

Abstract

The utility model relates to engineering machinery, in particular to a crawler excavator, which is characterized in that support legs which correspondingly extend forwards and backwards are arranged on the front side and the rear side of a chassis of a vehicle body at the lower part; the connecting end of each supporting leg is rotationally connected with the corresponding supporting leg support through a connecting pin shaft and provided with a pluggable locking pin shaft, the connecting end of each supporting leg and the corresponding supporting leg support are provided with a folding locking pin hole and a supporting locking pin hole which can be coaxially aligned, and when the locking pin shaft is located in the folding locking pin hole, the landing end of each supporting leg is higher than the landing face of the crawler belt. When the locking pin shafts are located in the supporting locking pin holes, the landing ends of the supporting legs are not higher than the landing surfaces of the tracks and protrude out of the corresponding ends of the track beams on the left and right sides in the front-back direction; a tension spring is connected between each supporting leg and the chassis, and the connecting pin shafts are located below the tension springs connected with the corresponding supporting legs. In the utility model, the excavator is supported in an auxiliary way by using the supporting legs, so that the stability of the excavator is improved. The stability improving mode does not change size parameters of the excavator chassis and is easy to realize.

Description

Technical Field

[0001] This utility model relates to a type of engineering machinery, and more specifically, to a tracked excavator. Background Technology

[0002] The tracked excavator includes a lower body and an upper body that is slewing mounted on the lower body. The chassis of the lower body includes a base frame, track beams fixed to the left and right sides of the base frame, a travel hydraulic motor and tracks mounted on the track beams, and the excavator's working device is mounted on the upper body.

[0003] The stability of a tracked excavator primarily depends on the area between its tracks. Excavator manufacturers typically design the chassis based on the excavator's main functions and tonnage, determining the track length on the ground and the track width between the left and right tracks. Excavators may be equipped with different working attachments depending on the work requirements. For example, they may be equipped with extra-long booms or sticks for certain special working conditions, or they may face special operating environments such as working on slopes. The configuration of certain special working attachments or the operation in special environments places higher demands on the excavator's stability. However, for excavators that have already been manufactured and are in a standardized state, stability cannot be improved by increasing the track length on the ground or widening the track width. Redesigning an excavator specifically for special working attachments or conditions would significantly increase costs. Utility Model Content

[0004] The technical problem to be solved by this utility model is the difficulty in improving the stability of tracked excavators after they have been finalized, and a tracked excavator is provided.

[0005] The technical solution of this utility model to achieve its purpose is as follows: a tracked excavator, the lower body of which includes a chassis and track beams fixed to the left and right sides of the chassis. Outrigger supports and corresponding outriggers extending forward and backward are provided on the front and rear sides of the chassis. The connecting end of each outrigger is rotatably connected to the corresponding outrigger support via a connecting pin and is provided with a removable locking pin. Each outrigger's connecting end and corresponding outrigger support are provided with retractable locking pin holes and support locking pin holes that can be coaxially aligned. When the locking pin is located in the coaxially aligned retractable locking pin hole, the ground contact end of the outrigger is higher than the track surface. When the locking pin is located in the coaxially aligned support locking pin hole, the ground contact end of the outrigger is not higher than the track surface and protrudes in the front-rear direction from the corresponding ends of the left and right track beams. A tension spring is connected between each outrigger and the chassis, and the connecting pin is located below the tension spring connecting the corresponding outrigger.

[0006] In this invention, when needed, the locking pin is removed from the retractable locking pin hole, the outriggers are lowered, and then the locking pin is inserted back into the support locking pin hole. The outriggers provide auxiliary support to the excavator, improving its stability. This method of improving excavator stability does not change the dimensional parameters of the excavator chassis and is easily implemented in excavators that have already been designed or manufactured.

[0007] In this tracked excavator, the outriggers on the front and rear sides of the chassis are each two in number and are arranged symmetrically about the mid-surface of the chassis.

[0008] In this tracked excavator, the sections of each outrigger near the ground are bent in the direction indicated by the end of the adjacent track beam.

[0009] In this tracked excavator, the locking pin and the connecting pin are arranged in parallel.

[0010] In this tracked excavator, the support locking pin hole has two or more sets, and the ground contact end of the outrigger has different heights when the locking pin shaft is located in different support locking pin holes.

[0011] In this utility model of a tracked excavator, the outrigger is provided with a spring support for connecting to a tension spring. The spring support is detachably fixed by bolts, and the mounting hole on the spring support for the bolt to pass through is an elongated hole extending in the length direction of the outrigger.

[0012] In this tracked excavator, the outriggers have a box-shaped structure, and the spring supports are arranged on the top surface of the outriggers.

[0013] In this tracked excavator, each outrigger has a ground foot at its ground contact end, and the ground foot is rotatably connected to the outrigger via a pin.

[0014] In this utility model of a tracked excavator, the outrigger support includes upper and lower support plates arranged at intervals, a vertical support plate whose upper and lower sides are fixedly connected to the upper and lower support plates, and an outrigger connecting plate fixed on the vertical support plate for rotatable connection with the outrigger; the upper and lower support plates are welded to the vertical side plates corresponding to the front and rear sides of the chassis; the retractable locking pin hole, the support locking pin hole, and the rotatable connecting pin hole that cooperates with the connecting pin are provided on the outrigger connecting plate.

[0015] In this tracked excavator, the upper side plate of the chassis is provided with a spring connecting seat for connecting with the tension spring.

[0016] Compared with the prior art, this invention utilizes outriggers to provide auxiliary support for the excavator, thereby improving its stability. This method of improving excavator stability does not change the dimensional parameters of the excavator chassis and is easily implemented in excavators that have already been designed or manufactured. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the chassis system structure of the tracked excavator of this utility model.

[0018] Figure 2 This is a schematic diagram of the outriggers in the tracked excavator of this utility model.

[0019] Figure 3 This is a schematic diagram of the outrigger support in the tracked excavator of this utility model.

[0020] Figure 4 This is a schematic diagram of the tracked excavator of this utility model with the outriggers in the retracted state.

[0021] Component names and serial numbers in the diagram:

[0022] 1. Chassis; 2. Track beam; 21. Idler wheel; 3. Outrigger; 31. Hinge plate; 32. Connecting pin; 33. Locking pin; 35. Ground foot; 36. Foot mounting pin; 37. First pin hole of outrigger; 38. Second pin hole of outrigger; 39. Third pin hole of outrigger; 4. Outrigger support; 41. Upper support plate; 42. Lower support plate; 43. Vertical support plate; 44. Outrigger connecting plate; 45. First pin hole of support; 46. Second pin hole of support; 47. Third pin hole of support; 48. Spring connecting seat; 5. Tension spring; 51. Spring support; 52. Mounting hole; 81. Track with ground surface; 82. Track end face. Detailed Implementation

[0023] The specific implementation plan is described below with reference to the attached diagram.

[0024] In this embodiment, the tracked excavator has a lower body including a chassis 1 and track beams 2 fixed to the left and right sides of the chassis 1. A guide wheel 21 is installed at one end (usually the front end) of the track beam 2, and a travel motor (not shown in the figure) is installed at the other end (usually the rear end). Track rollers, carrier rollers, tracks, and other components are also installed on the track beam 2. The tracks (not shown in the figure) are looped around the track beam 2. The bottom surface of the track beam 2 is the track surface 81, and the vertical surfaces where the front and rear ends of the left and right tracks are located are the track end faces 82.

[0025] In this embodiment, with the tracked excavator parked on a horizontal surface as the reference, the direction of movement of the track beam 2 is the front-to-back direction, and the direction of the tracks on both sides is the left-to-right direction.

[0026] The chassis 1 of a tracked excavator is typically a box-shaped structure, comprising an upper side plate and a lower side plate. A front vertical side plate, welded to both the upper and lower side plates, is located at the front of the chassis 1, and a rear vertical side plate, also welded to both the upper and lower side plates, is located at the rear. Outrigger supports 4 are provided on both the front and rear sides of the chassis 1.

[0027] like Figure 3 As shown, the outrigger support 4 includes a vertical support plate 43, an outrigger connecting plate 44, and an upper support plate 41 and a lower support plate 42 arranged parallel to each other. The upper and lower edges of the vertical support plate 43 are welded to the upper support plate 41 and the lower support plate 42 respectively. The outrigger connecting plate 44 is welded to the vertical support plate 43 for rotatable connection with the outrigger 3. The upper support plate 41 and the lower support plate 42 are welded to the corresponding vertical side plates on the front and rear sides of the chassis 1, that is, the front outrigger support 3 is welded to the front vertical side plate of the chassis 1, and the rear outrigger support 3 is welded to the rear vertical side plate of the chassis 1. The outrigger support 4 is welded to the vertical side plates of the chassis 1 to form a box-shaped structure, thereby ensuring its strength.

[0028] Two sets of leg connecting plates 44 are provided on the vertical support plate 43, corresponding to the number of legs 3 arranged on this side of the chassis 1. Each set of leg connecting plates 44 is provided with three pin holes, namely the first pin hole 45, the second pin hole 46, and the third pin hole 47. The first pin hole 45, the second pin hole 46, and the third pin hole 47 are used as rotating connection pin holes, retractable locking pin holes, and support locking pin holes, respectively.

[0029] like Figure 2 As shown, the support leg 3 has a box-shaped structure, with one end serving as a connecting end that connects to the support leg base 4. The connecting end of the support leg 3 is provided with two hinged lugs 31. When the support leg 3 is connected to the support leg base 4, the support leg connecting plate 44 on the support leg base 4 is located between the two hinged lugs 31.

[0030] Corresponding to the first pin hole 45, second pin hole 46, and third pin hole 47 on the outrigger connecting plate 44, the hinge lug 31 of the outrigger 3 also has a first pin hole 37, a second pin hole 38, and a third pin hole 39. The first pin hole 37, the second pin hole 38, and the third pin hole 39 function as a rotating connecting pin hole, a retractable locking pin hole, and a supporting locking pin hole, respectively. The rotating connecting pin hole (first pin hole 37) on the hinge lug 31 is coaxially aligned with the rotating connecting pin hole on the outrigger connecting plate 44 (i.e., the first pin hole 37 is coaxially aligned with the first pin hole 45), and a connecting pin 32 is installed therein. When the locking pin 33 is not inserted into either the retractable or supporting locking pin hole, the outrigger 3 can rotate up and down around the connecting pin 32. The locking pin 33 and the connecting pin 32 are arranged in parallel.

[0031] The second pin hole 38 of the outrigger can also be coaxially aligned with the second pin hole 46 of the support, that is, the retractable locking pin hole on the hinge ear plate 31 is coaxially aligned with the retractable locking pin hole on the outrigger connecting plate 44. When the two are coaxially aligned and the locking pin 33 is inserted therein, the outrigger 3 is in the retracted state, and the height of its ground-contact end is higher than the ground level 81 of the track. At this time, the outrigger 3 does not provide support for the tracked excavator. Figure 4 As shown.

[0032] After removing the locking pin from the retractable locking pin hole, the outrigger 3 can rotate relative to the outrigger support 4. After rotating to a predetermined angle, the third pin hole 39 of the outrigger can be coaxially aligned with the third pin hole 47 of the support, that is, the support locking pin hole on the hinge ear plate 31 is coaxially aligned with the support locking pin hole on the outrigger connecting plate 44. When the two are coaxially aligned and the locking pin 33 is inserted therein, the outrigger 3 is in a supported state, and its ground-contact end is not higher than the track surface 81. At this time, the ground-contact end of the outrigger 3 supports the ground and provides support for the tracked excavator. When the ground-contact end of the outrigger 3 supports the ground, the ground-contact end of the outrigger 3 protrudes from the corresponding ends of the left and right track beams 2 in the front-rear direction. That is, the ground-contact end of the front outrigger 3 of the chassis protrudes forward from the track end face 82 of the front part of the track, and the ground-contact end of the rear outrigger 3 of the chassis protrudes backward from the track end face 82 of the rear part of the track.

[0033] Optionally, the retractable locking pin hole and the support locking pin hole on the hinge ear plate 31 can be the same pin hole. That is, the hinge ear plate 31 is provided with the first support pin hole 37 and the second support pin hole 38, and the support second pin hole 46 and the support third pin hole 47 on the support connecting plate 44 are located on a circle with the support first pin hole 45 as the center. When the support leg 3 rotates relative to the support leg support 4 to a predetermined angle and the support second pin hole 38 is coaxially aligned with the support third pin hole 47 on the support connecting plate 44, the support second pin hole 38 is used as a support locking pin hole. When the support leg 3 rotates relative to the support leg support 4 to another predetermined angle and the support second pin hole 46 is coaxially aligned with the support third pin hole 47 on the support connecting plate 44, the support second pin hole 38 is used as a retractable locking pin hole.

[0034] Optionally, there can be multiple support locking pin holes, that is, multiple outrigger third pin holes 39 are provided on the hinge ear plate 31. When the outrigger 3 rotates to different angles relative to the outrigger support 4, the corresponding outrigger third pin hole 39 on the hinge ear plate 31 is coaxially aligned with the corresponding support third pin hole 47 on the outrigger connecting plate 44 so that the locking pin 33 can be inserted therein. With different outrigger third pin holes 39 coaxially aligned with the support third pin hole 47 and the locking pin 33 inserted, the ground contact end of the outrigger 3 has different heights relative to the track and the ground surface 81, thereby meeting some special working conditions, such as better supporting the tracked excavator on slopes or relatively soft surfaces.

[0035] like Figure 1 Figure 2 As shown, a spring support 51 is installed on the top surface of the outrigger 3, and a spring connecting seat 48 is fixed on the upper side plate of the chassis 1. A tension spring 5 is connected between each pair of spring supports 51 and the corresponding spring connecting seat 48. The connecting pin 32 is located below the tension spring 5 connecting the corresponding outrigger. The tension spring 5 is used to balance part of the weight of the outrigger 3 so that it can act as a buffer when the outrigger rotates downward and provide assistance when it flips upward.

[0036] Optionally, the spring support 51 is detachably and fixedly connected to the support leg 3 by bolts. The mounting hole 52 on the spring support 51 for the bolt to pass through is an elongated hole extending in the length direction of the support leg. The mounting position of the spring support 51 on the support leg 3 can be adjusted by adjusting the position of the bolt in the mounting hole, thereby adjusting the elastic force of the tension spring 5.

[0037] like Figure 2 As shown, the ground-touching end of the outrigger 3 is provided with a ground foot 35. The ground foot 35 is rotatably connected to the outrigger 3 via a foot mounting pin 36. The ground foot 35 can increase the contact area with the ground and can also adjust its angle to a certain extent according to the slope of the ground, so that the outrigger can better support the ground.

[0038] like Figure 1 As shown, two outriggers 3 are provided on the front and rear sides of the chassis 1, arranged symmetrically about the mid-surface of the chassis 1. The section of each outrigger 3 near the ground contact point bends in the direction indicated by the end of the adjacent track beam 2. Specifically, the section of the outrigger 3 located on the left side of the front of the chassis near the ground contact point bends forward towards the left track beam; the section of the outrigger located on the right side of the front of the chassis near the ground contact point bends forward towards the right track beam; the section of the outrigger located on the left side of the rear of the chassis near the ground contact point bends backward towards the left track beam; and the section of the outrigger located on the right side of the rear of the chassis near the ground contact point bends backward towards the right track beam. This corresponding left and right bending of the outriggers provides better support for the chassis.

Claims

1. A tracked excavator, the lower body of which includes a chassis and track beams fixed to the left and right sides of the chassis, characterized in that, The chassis has outrigger supports and corresponding outriggers extending forward and backward, respectively. Each outrigger's connecting end is rotatably connected to its corresponding outrigger support via a connecting pin and is equipped with a removable locking pin. Each outrigger's connecting end and corresponding outrigger support has coaxially aligned retractable locking pin holes and support locking pin holes. When the locking pin is located in the coaxially aligned retractable locking pin hole, the outrigger's ground-contact end is higher than the track surface. When the locking pin is located in the coaxially aligned support locking pin hole, the outrigger's ground-contact end is not higher than the track surface and protrudes from the corresponding ends of the left and right track beams in the front-rear direction. Each outrigger is connected to the chassis by a tension spring, and the connecting pin is located below the tension spring connecting the corresponding outrigger.

2. The tracked excavator according to claim 1, characterized in that, The chassis has two outriggers on each of its front and rear sides, which are arranged in a mirror-symmetrical manner about the mid-surface of the chassis.

3. The tracked excavator according to claim 2, characterized in that, The sections of each outrigger near the ground end are bent in the direction indicated by the end of the adjacent track beam.

4. The tracked excavator according to claim 2, characterized in that, The locking pin and the connecting pin are arranged in parallel.

5. The tracked excavator according to any one of claims 1 to 4, characterized in that, The support locking pin hole has two or more sets, and the ground contact end of the outrigger has different heights when the locking pin is located in different support locking pin holes.

6. The tracked excavator according to any one of claims 1 to 4, characterized in that, The outrigger is provided with a spring support for connection with a tension spring. The spring support is detachably fixed by bolts. The mounting hole on the spring support for the bolt to pass through is an elongated hole extending in the length direction of the outrigger.

7. The tracked excavator according to claim 6, characterized in that, The support leg has a box-shaped structure, and the spring support is arranged on the top surface of the support leg.

8. The tracked excavator according to any one of claims 1 to 4, characterized in that, Each of the outriggers has a ground foot at its ground contact end, and the ground foot is rotatably connected to the outrigger via a pin.

9. The tracked excavator according to claim 1, characterized in that, The outrigger support includes upper and lower support plates arranged at intervals, a vertical support plate whose upper and lower edges are fixedly connected to the upper and lower support plates, and an outrigger connecting plate fixed on the vertical support plate for rotatable connection with the outrigger; the upper and lower support plates are welded to the vertical side plates corresponding to the front and rear sides of the chassis; the retractable locking pin hole, the support locking pin hole, and the rotatable connecting pin hole that cooperates with the connecting pin are provided on the outrigger connecting plate.

10. The tracked excavator according to claim 1, characterized in that, The upper side plate of the chassis is provided with a spring connecting seat for connecting with the tension spring.

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