Shovel gap adjustment mechanism

Abstract

The utility model relates to a kind of excavator bucket gap adjusting mechanism, including a pair of bucket ear plate, a pair of bucket ear plate is hinged with bucket rod or connecting rod by hinged pin shaft, further including sleeve cylinder and inner sleeve set in the outside of hinged pin shaft, sleeve cylinder and inner sleeve are located between one piece of bucket ear plate and bucket rod or connecting rod, one end of inner sleeve slides into the inside of sleeve cylinder, the other end of inner sleeve extends out of sleeve cylinder and the end surface of bucket rod or connecting rod is contacted, pre-tightening elastic member is arranged between the end of inner sleeve into the inside of sleeve cylinder and sleeve cylinder, pre-tightening elastic member is telescopic along the axial direction of hinged pin shaft;Sleeve cylinder is abutted with bucket ear plate and the sealing ring is arranged between the both.The utility model provides pre-tightening force using elastic member, so that the end surface of excavator bucket gap adjusting mechanism and bucket ear plate always maintains abutment, to compensate the gap generated by the wear of bucket ear plate and connecting rod or bucket rod end surface, without excavator shutdown, the automatic adjustment of bucket gap can be realized, greatly improve work efficiency.

Description

Technical Field

[0001] This utility model relates to an excavator bucket clearance adjustment mechanism. Background Technology

[0002] The bucket lugs on the excavator bucket are hinged to the connecting rod (or stick) by a pin. During the working rotation of the bucket, the end face of the connecting rod (or stick) contacts the end face of the bucket lugs. After working for a long time, the wear gap of the contact end face increases, which prevents the bucket from working normally. At this time, the excavator needs to be stopped and the gap needs to be adjusted by adjusting the mechanism.

[0003] Traditional adjustment mechanisms use a T-sleeve and a clamping sleeve connected by bolts. The distance between the T-sleeve and the end face of the connecting rod (or stick) is changed by increasing or decreasing the number of adjusting shims. This requires the excavator to be stopped, the bolts to be removed, and the clamping sleeve and T-sleeve to be adjusted. This work accompanies the entire working process of the excavator. During the work, the gap between the T-sleeve and the end face of the stick needs to be observed and checked at any time. It is time-consuming, labor-intensive, and has extremely low work efficiency. Utility Model Content

[0004] This utility model addresses the problems existing in the prior art by providing an excavator bucket clearance adjustment mechanism.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: an excavator bucket clearance adjustment mechanism, comprising a pair of bucket ear plates disposed on the bucket, the pair of bucket ear plates being hinged to the stick or connecting rod via a hinge pin, and further comprising an outer sleeve and an inner sleeve coaxially sleeved outside the hinge pin, the outer sleeve and the inner sleeve being disposed between one of the bucket ear plates and the stick or connecting rod, one end of the inner sleeve being slidably inserted into the outer sleeve and the other end extending out of the outer sleeve and contacting the end face of the stick or connecting rod, a pre-tightening elastic element being disposed between the end of the inner sleeve extending into the outer sleeve and the outer sleeve, the pre-tightening elastic element being axially expandable and contractable along the hinge pin; the outer sleeve abutting against the bucket ear plate and a sealing ring being disposed between the two.

[0006] Furthermore, the inner sleeve has a first annular groove on one end face that extends into the outer sleeve, the outer sleeve has an inner annular flange, the inner annular flange has a second annular groove, and the two ends of the pre-tightening elastic member extend into the first annular groove and the second annular groove, respectively.

[0007] Furthermore, the pre-tightening elastic element is a pre-tightening spring sleeved on the outside of the hinge pin.

[0008] Furthermore, the inner wall of the outer sleeve has multiple snap-fit ​​grooves evenly distributed around its circumference at the end away from the sealing ring. The snap-fit ​​grooves extend along the circumferential direction of the inner wall of the outer sleeve, and one end of each snap-fit ​​groove is connected to a sliding groove. The sliding groove extends along the axial direction of the outer sleeve toward the end of the outer sleeve away from the sealing ring. The outer surface of the inner sleeve has multiple snap-fit ​​protrusions evenly distributed around its circumference. The positions of the multiple snap-fit ​​protrusions correspond to the positions of the multiple snap-fit ​​grooves. When the inner sleeve extends into the inner sleeve, the snap-fit ​​protrusions slide and engage with the sliding grooves. The snap-fit ​​grooves facilitate the inner sleeve to extend into place and the snap-fit ​​protrusions to engage after rotation.

[0009] Furthermore, the snap-fit ​​groove and the sliding groove are L-shaped.

[0010] Furthermore, an outer annular flange is provided on the outer surface of the end of the inner sleeve that extends out of the outer sleeve, and the diameter of the outer annular flange is larger than the inner diameter of the outer sleeve.

[0011] Furthermore, the outer surface of the outer sleeve away from the sealing ring has multiple indicator posts evenly distributed around its circumference, and the outer annular flange has multiple indicator recesses evenly distributed around its circumference, with the positions of the multiple indicator recesses corresponding to the positions of the multiple indicator posts.

[0012] Furthermore, each indicator post includes an open-ring indicator post and a locking ring indicator post arranged adjacent to each other along the circumference of the outer sleeve. The length of the open-ring indicator post is greater than the length of the locking ring indicator post. When the inner sleeve extends into the inner sleeve and the locking protrusion is not engaged in the locking groove, the indicator recess corresponds to the position of the open-ring indicator post. When the inner sleeve rotates until the locking protrusion is engaged in the locking groove, the indicator recess corresponds to the position of the locking ring indicator post.

[0013] Furthermore, the outer annular flange has multiple wrench positions evenly distributed around its outer circumference. Each wrench position is planar, and an indicator notch is provided in the center of each wrench position.

[0014] Furthermore, an annular mounting groove is provided on one end face of the outer sleeve near the sealing ring. One end of the sealing ring is embedded in the annular mounting groove, and the other end extends out of the annular mounting groove and contacts the bucket ear plate.

[0015] Compared with the prior art, the present invention has the following advantages: The present invention is reasonably designed, and adopts an outer sleeve and an inner sleeve with sliding fit between one of the bucket ear plates and the connecting rod or stick. A retractable pre-tightening elastic element is set between the inner sleeve and the outer sleeve. The pre-tightening elastic element provides pre-tightening force, so that the excavator bucket clearance adjustment mechanism and the end face of the bucket ear plate always remain in contact, so as to compensate for the gap caused by wear between the bucket ear plate and the end face of the connecting rod or stick. The bucket clearance can be automatically adjusted without stopping the excavator, which greatly improves work efficiency. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present invention in conjunction with a bucket; Figure 2 yes Figure 1 A schematic diagram of the front view sectional structure; Figure 3 This is a three-dimensional structural schematic diagram of an embodiment of the present utility model; Figure 4 This is a cross-sectional structural schematic diagram of an embodiment of the present utility model; Figure 5 This is an exploded view of an embodiment of the present invention; Figure 6 This is a three-dimensional structural diagram of the outer sleeve in an embodiment of this utility model; Figure 7 This is a cross-sectional structural diagram of the outer sleeve in an embodiment of this utility model; Figure 8 This is a three-dimensional structural diagram of the inner sleeve in an embodiment of this utility model; Figure 9 This is a schematic cross-sectional view of the inner sleeve in an embodiment of this utility model; Figure 10 This is a cross-sectional schematic diagram of the locking ring state in an embodiment of this utility model; Figure 11 This is a cross-sectional schematic diagram of the open-loop state in an embodiment of this utility model; Figure 12 This is a cross-sectional view of the inner sleeve protruding in an embodiment of this utility model.

[0017] In the picture: 1-Clearance adjustment mechanism; 2-Bucket ear plate; 3-Stick or connecting rod; 4-Hinged pin; 5-Nut; 6-Washer; 7-Outer sleeve; 8-Inner sleeve; 9-Sealing ring; 10-First annular groove; 11-Inner annular flange; 12-Second annular groove; 13-Preload spring; 14-Snap-fit ​​groove; 15-Slide groove; 16-Snap-fit ​​protrusion; 17-Outer annular flange; 18-Indicator notch; 19-Open ring indicator post; 20-Locking ring indicator post; 21-Wrench holder; 22-Annular mounting groove; 23-Bucket. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] like Figures 1-9 As shown, this utility model discloses an excavator bucket clearance adjustment mechanism. The clearance adjustment mechanism 1 is disposed between the bucket lug plate and the connecting rod, or between the bucket lug plate and the stick. Specifically, it includes a pair of bucket lug plates 2 disposed on the bucket 23. The pair of bucket lug plates 2 are hinged to the stick or connecting rod 3 via a hinge pin 4. The hinge pin 4 can be bolt-shaped and has both ends passing through the pair of bucket lug plates 2. A nut 5 is screwed to one end of the hinge pin 4, and a washer 6 is provided between the nut 5 and the bucket lug plate 2. The clearance adjustment mechanism 1 also includes an outer sleeve 7 coaxially sleeved on the outside of the hinge pin 4. The inner sleeve 8 and the outer sleeve 7 are disposed between one of the bucket ear plates 2 and the stick or connecting rod 3. One end of the inner sleeve 8 can slide into the inner sleeve 7, and the other end extends out of the outer sleeve 7 and abuts against the end face of the stick or connecting rod 3, that is, the inner and outer sleeves form a telescopic structure. A pre-tightening elastic element is provided between the end of the inner sleeve 8 that extends into the outer sleeve 7 and the outer sleeve 7. The pre-tightening elastic element extends and contracts along the axial direction of the hinge pin 4, and the elastic element provides pre-tightening force. The outer sleeve 7 abuts against the end face of the bucket ear plate 2, and a sealing ring 9 is provided between the two. An outer sleeve and an inner sleeve with a sliding fit are installed between one of the bucket ear plates and the connecting rod or stick. An elastic element that can stretch and deform is installed between the inner sleeve and the outer sleeve. The elastic element provides a preload force, so that the excavator bucket clearance adjustment mechanism and the end face of the bucket ear plate always remain in contact to compensate for the clearance caused by wear between the bucket ear plate and the end face of the connecting rod or stick. The bucket clearance can be automatically adjusted without stopping the excavator, which greatly improves work efficiency.

[0021] In this embodiment, the inner sleeve 8 has a first annular groove 10 on one end face that extends into the outer sleeve 7. The inner annular flange 11 is provided at one end of the outer sleeve 7 near the sealing ring 9. The inner annular flange 11 has a second annular groove 12, which corresponds to the position of the first annular groove 10. The two ends of the pre-tightening elastic member extend into the first annular groove 10 and the second annular groove 12, respectively, to install the pre-tightening elastic member.

[0022] In this embodiment, the pre-tightening elastic element is a pre-tightening spring 13 sleeved on the outside of the hinge pin 4. The two ends of the pre-tightening spring 13 extend into the first annular groove 10 and the second annular groove 12 respectively, and abut against each other.

[0023] In this embodiment, the inner wall of the outer sleeve 7 has a plurality of snap-fit ​​grooves 14 evenly distributed around its circumference at the end away from the sealing ring 9. The snap-fit ​​grooves 14 are arc-shaped and extend along the circumferential direction of the inner wall of the outer sleeve 7. One end of each snap-fit ​​groove 14 is connected to a sliding groove 15. The sliding groove 15 extends along the axial direction of the outer sleeve 7 toward the end of the outer sleeve 7 away from the sealing ring 9. The outer surface of the inner sleeve 8 has a plurality of arc-shaped snap-fit ​​protrusions 16 evenly distributed around its circumference. The number and position of the plurality of snap-fit ​​protrusions 16 correspond to the plurality of snap-fit ​​grooves 14. When the inner sleeve 8 extends into the inner sleeve 7, the snap-fit ​​protrusions 16 slide and engage with the sliding grooves 15. When the inner sleeve 8 is fully extended, the snap-fit ​​protrusions 16 move to the position corresponding to the snap-fit ​​grooves 14. After rotating the inner sleeve 8, the snap-fit ​​protrusions 16 are engaged in the snap-fit ​​grooves 14, realizing the locking ring state. When the snap-fit ​​protrusion 16 is not snapped into the snap-fit ​​groove 14, the inner sleeve 8 and the outer sleeve 7 can slide relative to each other, and are in an open-loop state.

[0024] In this embodiment, the snap-fit ​​groove 14 and the sliding groove 15 are arranged in an L-shape.

[0025] In this embodiment, an outer annular flange 17 is provided on the outer surface of the end of the inner sleeve 8 that extends out of the outer sleeve 7, and the diameter of the outer annular flange 17 is larger than the inner diameter of the outer sleeve 7.

[0026] In this embodiment, four indicator posts are evenly distributed around the circumference of the outer surface of the outer sleeve 7 away from the sealing ring 9, and four indicator recesses 18 are evenly distributed around the circumference of the outer annular flange 17. The positions of the four indicator recesses 18 correspond to the positions of the four indicator posts. Specifically, each indicator post includes an open-ring indicator post 19 and a locking ring indicator post 20 arranged adjacent to each other along the circumference of the outer sleeve 7. The length of the open-ring indicator post 19 is greater than the length of the locking ring indicator post 20. When the inner sleeve 8 extends into the inner sleeve 7 and the engaging protrusion 16 is not engaged in the engaging groove 14 (at this time, the engaging protrusion is located in the sliding groove), it is in the open-ring state, and the position of the indicator recesses 18 corresponds to the position of the open-ring indicator post 19. When the inner sleeve 8 rotates until the engaging protrusion 16 is engaged in the engaging groove 14, it is in the locking ring state, and the position of the indicator recesses 18 corresponds to the position of the locking ring indicator post 20. When in use, when the inner sleeve rotates until the locking ring indicator post aligns with the indicator notch, the bucket clearance adjustment mechanism is in the locking ring state, which facilitates installation onto the pin shaft; when the inner sleeve rotates until the open ring indicator post aligns with the indicator notch, the bucket clearance adjustment mechanism is in the open ring state. During the excavator's operation, it can automatically compensate for the wear clearance between the bucket and the connecting rod (or stick) end faces without stopping the machine.

[0027] In this embodiment, four wrench positions 21 are evenly distributed around the outer circumference of the outer annular flange 17. Each wrench position 21 is planar, and an indicator notch 18 is provided in the center of each wrench position 21. The wrench positions are provided through the outer annular flange of the inner sleeve, which facilitates the adjustment of the state of the bucket clearance adjustment mechanism by means of a wrench.

[0028] In this embodiment, an annular mounting groove 22 is provided on one end face of the outer sleeve 7 near the sealing ring 9. One end of the sealing ring 9 is embedded in the annular mounting groove 22, and the other end extends out of the annular mounting groove 22 and contacts the bucket ear plate 2.

[0029] Installation and application of the bucket clearance adjustment mechanism: When the bucket clearance adjustment mechanism is in the locked ring state, it is inserted between the bucket ear plate and the connecting rod or stick. After the connecting rod or stick and the bucket ear plate are installed, the inner sleeve needs to be rotated counterclockwise with the adjustable wrench to align the indicator notch with the open ring indicator post, so that the bucket clearance adjustment mechanism is in the open ring state, realizing the automatic clearance adjustment function of the bucket clearance adjustment mechanism.

[0030] like Figure 10 As shown, when the bucket clearance adjustment mechanism is not installed on the hinge pin 4 between the bucket lug 2 and the connecting rod or stick 3, the bucket clearance adjustment mechanism is in the locking ring state, at which time the indicating notch 18 is aligned with the locking ring indicating post 20. Figure 11 As shown, after the bucket clearance adjustment mechanism 1 is installed on the hinge pin 4 between the bucket ear plate 2 and the connecting rod or stick 3, the bucket clearance adjustment mechanism 1 should be adjusted to the open-loop state, at which time the indicating notch 18 is aligned with the open-loop indicating post 19. During the excavator's operation, when the clearance between the bucket ear plate 2 and the connecting rod or stick 3 increases, the preload spring 13 of the bucket clearance adjustment mechanism 1 will automatically spring the inner sleeve 8 outwards and tighten it. Figure 12 As shown.

[0031] The advantages of this utility model are: (1) By setting a pre-tightening spring between the inner and outer sleeves, the wear gap between the bucket and the connecting rod (or stick) end face can be automatically compensated when the excavator is not stopped; (2) The inner sleeve and the outer sleeve are connected by a snap fastener, and the outer sleeve and the inner sleeve are provided with a locking ring indicator post, an opening ring indicator post and an indicator notch. The outer annular flange of the inner sleeve is provided with a wrench position in the circumferential direction, which can realize the intuitive and efficient installation of the excavator bucket gap adjustment mechanism.

[0032] If this utility model discloses or relates to mutually fixedly connected parts or structural components, then, unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws), or a non-detachable fixed connection (e.g., riveting, welding). Of course, mutually fixed connections can also be replaced by an integral structure (e.g., manufactured using a casting process) (except where it is obviously impossible to use an integral forming process).

[0033] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in this utility model above include states or shapes that are similar to, close to, or approximate with them.

[0034] Any component provided by this utility model can be assembled from multiple individual components, or it can be a single component manufactured by a one-piece molding process.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A bucket clearance adjustment mechanism for an excavator, comprising a pair of bucket lugs mounted on the bucket, the pair of bucket lugs being hinged to the boom or connecting rod via hinge pins, characterized in that: It also includes an outer sleeve and an inner sleeve coaxially sleeved on the outside of the hinge pin. The outer sleeve and the inner sleeve are disposed between one of the bucket ear plates and the stick or connecting rod. One end of the inner sleeve can slide into the inside of the outer sleeve, and the other end extends out of the outer sleeve and contacts the end face of the stick or connecting rod. A pre-tightening elastic element is provided between the end of the inner sleeve that extends into the outer sleeve and the outer sleeve. The pre-tightening elastic element extends and retracts along the axial direction of the hinge pin. The outer sleeve abuts against the bucket ear plate and a sealing ring is provided between the two.

2. The excavator bucket clearance adjustment mechanism according to claim 1, characterized in that: The inner sleeve has a first annular groove on one end face that extends into the outer sleeve. The inner annular flange is provided inside the outer sleeve. The inner annular flange has a second annular groove. The two ends of the pre-tightening elastic member extend into the first annular groove and the second annular groove, respectively.

3. The excavator bucket clearance adjustment mechanism according to claim 1 or 2, characterized in that: The preload elastic element is a preload spring sleeved on the outside of the hinge pin.

4. The excavator bucket clearance adjustment mechanism according to claim 1, characterized in that: The inner wall of the outer sleeve has multiple snap-fit ​​grooves evenly distributed around its circumference at the end away from the sealing ring. The snap-fit ​​grooves extend along the circumferential direction of the inner wall of the outer sleeve, and one end of each snap-fit ​​groove is connected to a sliding groove. The sliding groove extends along the axial direction of the outer sleeve toward the end of the outer sleeve away from the sealing ring. The outer surface of the inner sleeve has multiple snap-fit ​​protrusions evenly distributed around its circumference. The positions of the multiple snap-fit ​​protrusions correspond to the multiple snap-fit ​​grooves. When the inner sleeve extends into the inner sleeve, the snap-fit ​​protrusions slide into the sliding grooves. The snap-fit ​​grooves facilitate the inner sleeve to extend into place and the snap-fit ​​protrusions to engage after rotation.

5. The excavator bucket clearance adjustment mechanism according to claim 4, characterized in that: The snap-fit ​​groove and the sliding groove are L-shaped.

6. The excavator bucket clearance adjustment mechanism according to claim 1, characterized in that: The outer surface of the end of the inner sleeve that extends out of the outer sleeve is provided with an outer annular flange, the diameter of which is larger than the inner diameter of the outer sleeve.

7. The excavator bucket clearance adjustment mechanism according to claim 6, characterized in that: The outer surface of the outer sleeve away from the sealing ring has multiple indicator posts evenly distributed around its circumference, and the outer annular flange has multiple indicator recesses evenly distributed around its circumference, with the positions of the multiple indicator recesses corresponding to the positions of the multiple indicator posts.

8. The excavator bucket clearance adjustment mechanism according to claim 7, characterized in that: Each indicator post includes an open-loop indicator post and a locking-loop indicator post arranged adjacent to each other along the circumference of the outer sleeve. The length of the open-loop indicator post is greater than the length of the locking-loop indicator post. When the inner sleeve extends into the inner sleeve and the locking protrusion is not engaged in the locking groove, the indicator recess corresponds to the position of the open-loop indicator post. When the inner sleeve rotates until the locking protrusion is engaged in the locking groove, the indicator recess corresponds to the position of the locking-loop indicator post.

9. The excavator bucket clearance adjustment mechanism according to claim 6, characterized in that: The outer annular flange has multiple wrench positions evenly distributed around its outer circumference. Each wrench position is planar, and an indicator notch is provided in the center of each wrench position.

10. The excavator bucket clearance adjustment mechanism according to claim 1, characterized in that: The outer sleeve has an annular mounting groove on one end face near the sealing ring. One end of the sealing ring is embedded in the annular mounting groove, and the other end extends out of the annular mounting groove and contacts the bucket ear plate.

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