CN202809692U - Stable bucket tooth of excavator, tooth holder and assembly comprising bucket tooth and tooth holder - Google Patents

Abstract

The utility model discloses a stable bucket tooth of an excavator, a tooth holder and an assembly comprising the bucket tooth and the tooth holder. The assembly comprises the bucket tooth, the tooth holder and a lock pin assembly, the bucket tooth is provided with a bucket tooth cavity, the tooth holder is provided with a tooth holder head, the bucket tooth cavity of the bucket tooth is provided with an inner surface complementary with an outer surface of the tooth holder head, a front end surface which is orthogonal to the central axis of the tooth holder head is arranged at the front end of the tooth holder head, first groups of matching surfaces, first groups of transitional surfaces and second groups of matching surfaces are sequentially arranged from the front end surface of the tooth holder head to the upper portion and the lower portion of the tooth holder head respectively, each of the groups of matching surfaces and the groups of transitional surfaces comprises at least three matching surfaces which are transversally and sequentially arranged symmetrically, preset obtuse angles are formed among the adjacent matching surfaces, the middle matching surface of each group of matching surfaces is parallel to the central axis of the tooth holder head, and the matching surfaces positioned on two sides of each group of matching surfaces are parallel to the central axis of the tooth holder head or slightly contract along the direction of the central axis from back to front. The stable bucket tooth, the tooth holder and the assembly are stressed uniformly when under multi-dimensional complicated acting force, and are particularly suitable for excavation and loading operation machinery in engineering machinery and mining machinery, the high stability can be kept, and the rejection rate is reduced advantageously when large-size bucket teeth are cast, so that the production cost is reduced.

Description

A kind of stable dipper teeth of digging machine, toothholder and assembly thereof

Technical field

The utility model relates to the parts of excavation, loading operation machinery in engineering machinery and the mining machinery, is specifically related to dipper teeth of digging machine, toothholder and matable assembly thereof.

Background technology

Excavator is a kind of engineering machinery commonly used and mining machinery, excavate, during loading operation, the scraper bowl of excavator is the mechanism that excavates with loading operation, scraper bowl plays cutting and loaded material in operation.Because work under bad environment, scraper bowl is not only stressed very complicated, and need to bear huge wearing and tearing.If the front end at scraper bowl is not taked any protection or strengthening measure, the working position of scraper bowl will be very fast by blunt even breakage, thereby can't satisfy the requirement that it should keep efficient operation in a long time.At the working edge of scraper bowl the dipper teeth assembly being installed is the common practice that addresses this problem; by install the dipper teeth assembly can protect the scraper bowl working end not by too early, wear and tear too quickly and increase the sharpness of bucket front-end; strengthen cutting, the delivered payload capability of scraper bowl; and can be by the part in the dipper teeth assembly of changing wear out failure; sharp and the efficient duty of scraper bowl is kept in realization; simultaneously because the just replacing of part assembly, thereby be conducive to reduce use cost.

Usually, the dipper teeth assembly is comprised of bucket tooth, toothholder and locking pin member that bucket tooth is locked to the toothholder.The rear portion of bucket tooth has cavity, and the toothholder front end is extruded with a toothholder head that can be contained in the described cavity, and the toothholder head firmly combines bucket tooth cavity and toothholder head by locking pin member after inserting described cavity.Damaged or wear up to when needing to change when bucket tooth, can unload old bucket tooth and change new bucket tooth by removing locking pin member, thereby keep the sharp and efficient of scraper bowl.

The working environment very severe of scraper bowl, complexity, the dipper teeth assembly of its front end will bear bucket and impose on its huge and changeable power, and the direction of these power is that multidimensional is changeable, therefore, bucket tooth must be fixed on the toothholder reliably, with axial load, transverse load, lateral load, impact force, torsional forces, shearing force and the vibration force etc. of bearing various complexity.

Because dipper teeth assembly stressed complexity in operation process, the mutual fit structure of bucket tooth and toothholder is extremely important, and this also is the emphasis of designer's innovation in the industry.The stability that fit structure is higher, enough combined strengths and property easy to assemble are the targets pursued of designer in the industry.

The applicant had once designed a kind of excavating tooth assembly, toothholder and bucket tooth analyzing at that time the basis of prior art, and applying for and having obtained the patent No. is the Chinese invention patent of ZL200810205012.2.The excavating tooth assembly of this patent disclosure, comprise bucket tooth, toothholder and locking piece, the bucket tooth rear portion provides cavity, the toothholder front end provides the toothholder head, this toothholder head is contained in the cavity of bucket tooth, the cavity of bucket tooth and toothholder head are firmly combined by locking piece, the cavity of bucket tooth has the inner surface with the external surface complementation of toothholder head, it is characterized in that, the top of toothholder head provides the First Transition joint face, the first fitting face and the 3rd fitting face, the bottom of toothholder head provides the second transition joint face, the second fitting face and the 4th fitting face, the first fitting face connects by the First Transition joint face with the 3rd fitting face, the second fitting face connects by the second transition joint face with the 4th fitting face, the angle that the first fitting face and the second fitting face become to be scheduled to the central axis of toothholder head respectively, the 3rd fitting face is parallel with the central axis of toothholder head respectively with the 4th fitting face, the 3rd fitting face and the 4th fitting face connect respectively the front end face of toothholder head, and the inner surface of the cavity of bucket tooth provides respectively and the first fitting face, the second fitting face, a plurality of fitting faces of the 3rd fitting face and the contact of the 4th fitting face.Bucket tooth in this patent can keep higher stability and form the excavating tooth assembly with enough combined strengths with toothholder when being subjected to the multidimensional active force, the shearing force that imposes on locking piece of bucket tooth is very little simultaneously, thereby locking piece be sheared destroy or under the shearing force effect sharp worn possibility greatly reduce, thereby guaranteed to comprise stability and the safety in utilization of the excavating tooth assembly of toothholder, bucket tooth, locking piece.But find that in actual use it still has the following disadvantages: the fitting face negligible amounts on the inner surface of the cavity of first bucket tooth rear end, the top of cavity only respectively is provided with a fitting face in front-end and back-end, the bottom of cavity also only respectively is provided with a fitting face in front-end and back-end, so stressed still even not; It two is because the fitting face quantity of aforementioned bucket tooth cavity upper and lower is few, so the area of single fitting face is larger, hour problem is little in the bucket tooth size for this, but when the size of bucket tooth is larger, then in casting process, may in the cooling contraction process, cause dimensional errors larger because shrinkage everywhere is uneven because of foundry goods, affect the quality of fit of bucket tooth and toothholder, and then affect the stability of excavating tooth assembly, because can't effectively cooperating too greatly, dimensional errors causes scrapping even; It three is that the radius of curvature of junction of the sidewall of bucket tooth cavity and each fitting face is too small, and the junction easily becomes stress concentration point, thereby in use problems of crack relatively easily occurs.In addition, application number is that the Chinese patent application of CN201080013609.2 disclosed " fully stable excavator bucket teeth attachment arrangement " also exists similar problem.

Application number is 201110287418.1 Chinese patent application disclosed " a kind of power shovel tooth assembly ", the front end of the toothholder head in this patent is prismatic structure, the rear end is a wedge structure, but the upper and lower is dissymmetrical structure, and there is orthogonal design between two two sides, so there is unbalance stress in it, and vertical junction stress is too concentrated and the deficiency of easy cracking, simultaneously, directly link to each other between its front and back ends fitting face, appear at easily that two origin of force when bearing moment of torsion too approach and the excessive problem of torsional forces that arrives and bear.

The utility model content

The purpose of this utility model is to provide a kind of dipper teeth of digging machine, toothholder and assembly thereof, so that this bucket tooth stressed relatively more even, higher stability of maintenance when being subjected to the multi-dimensional complicated active force, percent defective when being conducive to simultaneously reduce casting large-size bucket tooth is to reduce production costs, and the excavating tooth assembly that the bucket tooth that provides and toothholder combine can effectively improve the stressed of bucket tooth chamber and toothholder head matching part.

Digger shovel toothholder described in the utility model, the front portion of toothholder has the toothholder head with lockpin hole, the large front end in rear end is little substantially for the toothholder head, it is characterized in that the front end of toothholder head has the front end face of the central axis that is orthogonal to this toothholder head, the top of toothholder head is provided with the 3rd group of fitting face, first group of transition face and first group of fitting face successively from front end face, the bottom of toothholder head is provided with the 4th group of fitting face, second group of transition face and second group of fitting face successively from front end face, the both sides of toothholder head have the side joint face that connects toothholder head top and toothholder head bottom; Aforesaid front end face and all fitting faces refer to that all aforesaid all transition faces then maintain certain distance with the corresponding inner surface in bucket tooth chamber and the inner surface contact cooperation of not somersault tooth cavity for the face of somersault tooth cavity respective inner surfaces contact cooperation; Aforesaid every group of fitting face includes at least three and laterally is arranged in order and symmetrically arranged fitting face, become default obtuse angle between each adjacent fitting face, and the fitting face in the middle of being positioned in every group of fitting face is parallel with described central axis, and the fitting face that is positioned at both sides is then parallel with described central axis or along the from back to front slightly contraction of described central axial direction.

In two kinds of relations of the fitting face of both sides and described central axis, preferred fitting face shrinks from back to front slightly along described central axial direction, is serrated end near the front end face direction.These faces can be resisted bucket tooth around the rotation of central axis, play the firm effect of centering.Its advantage: hinder reversing of bucket tooth, make fit structure more firm, improve the stressed of locking pin member stressed and bucket tooth chamber and toothholder head mating part, avoid causing its fracture failure.Consider, the degree of contraction is advisable less than 10 degree with the angle between described fitting face in both sides and the described central axis.

In view of toothholder stressed multidirectional complexity in use, so described front end face is preferably arcwall face, and all fitting faces of described toothholder head are plane or almost plane.At this, those skilled in the art should understand, although all fitting faces are plane or almost plane, the intersection that comprises all adjacent surfaces of fitting face is not to form a wedge angle, form rounding off but done chamfered, to eliminate stress.

Consider the mechanical characteristic in the excavator use procedure, stressed for disperseing, preferred mode is: described the 3rd group of fitting face is identical with the number of fitting face in first group of fitting face, and in the 3rd group of fitting face in the angle between each adjacent fitting face and the first group of fitting face angle between each corresponding adjacent fitting face identical; Described the 4th group of fitting face is identical with the number of fitting face in second group of fitting face, and in the 4th group of fitting face in the angle between each adjacent fitting face and the second group of fitting face angle between each corresponding adjacent fitting face identical.

Consider the constant product quality of disperseing in stressed and the casting process, every group of fitting face forms by three fitting faces in left, center, right on the preferred described toothholder head, and the angle in every group of fitting face between each two adjacent fitting face is identical, is 120 ~ 150 degree.

The upper and lower of toothholder head can be symmetrical, also can be asymmetric, but preferably the upper and lower of described toothholder head is symmetrical, and the plane of symmetry is the plane that is parallel to the fitting face in the middle of being positioned in every group of fitting face and crosses described central axis.

For ease of the transmission of product surface transition and power, described first group of transition face and second group of transition face all are comprised of four faces that laterally are arranged in order, and symmetrical about described central axis in twos, and the angle that becomes to be scheduled to described central axis.

Described side joint face is the plane, and perpendicular to the described plane of symmetry.The toothholder head in actual use, side stressed usually less, therefore, the side joint face of toothholder head can be designed to be able to contact cooperation with the respective side inwall in bucket tooth chamber, to bear certain component, also can remain with gap in a small amount, so that produce and assembling.

Stable dipper teeth of digging machine described in the utility model, the rear portion of bucket tooth has the bucket tooth chamber of open rearward end, the two side, rear portion in bucket tooth chamber is provided with lockpin hole, the large front end in rear end is little substantially in the bucket tooth chamber, it is characterized in that the external surface shape complementation of inner surface and the described toothholder head in described bucket tooth chamber, and cooperate divided by the contact of the corresponding position outside the lower position:

Maintain certain distance between first group of transition face in bucket tooth chamber and the first group of transition face of described toothholder head and between second group of transition face of second group of transition face in bucket tooth chamber and described toothholder head, simultaneously, maintaining certain gap between the side joint face of the inside wall in bucket tooth chamber and described toothholder head maybe can form and contact cooperation.

The power shovel tooth assembly that the utility model is stable, comprise bucket tooth, toothholder and locking pin member, the rear portion of bucket tooth has the bucket tooth chamber of open rearward end, the front portion of toothholder has the toothholder head, this toothholder head is contained in the bucket tooth chamber of bucket tooth, bucket tooth chamber and the toothholder head of bucket tooth are firmly combined by locking pin member, it is characterized in that: the bucket tooth chamber of bucket tooth has the inner surface with the external surface complementation of toothholder head, and cooperates divided by the contact of the corresponding position outside the lower position:

Maintain certain distance between first group of transition face in bucket tooth chamber and the first group of transition face of described toothholder head and between second group of transition face of second group of transition face in bucket tooth chamber and described toothholder head, simultaneously, maintaining certain gap between the side joint face of the inside wall in bucket tooth chamber and described toothholder head maybe can form and contact cooperation;

The front end of toothholder head has the front end face of the central axis that is orthogonal to this toothholder head, the top of toothholder head is provided with the 3rd group of fitting face, first group of transition face and first group of fitting face successively from front end face, the bottom of toothholder head is provided with the 4th group of fitting face, second group of transition face and second group of fitting face successively from front end face, the both sides of toothholder head are provided with the side joint face that connects toothholder head top and toothholder head bottom; Aforesaid every group of fitting face includes at least three and laterally is arranged in order and symmetrically arranged fitting face, become default obtuse angle between each adjacent fitting face, and the fitting face in the middle of being positioned in every group of fitting face is parallel with described central axis, and the fitting face that is positioned at both sides is then parallel with described central axis or along the from back to front slightly contraction of described central axial direction.

The utility model compared with prior art, the assembly that bucket tooth of the present utility model, toothholder and assembly thereof form, on the one hand because fitting face is more, parallel with central axis or the substantially parallel setting of each fitting face, and the angle between each adjacent fitting face is larger, stress is lower, so can make bucket tooth stressed relatively more even, higher stability of maintenance when being subjected to the multi-dimensional complicated active force; Owing to single area less, the percent defective when being conducive to reduce casting large-size bucket tooth is to reduce production costs on the other hand.Particularly adopt the top and the bottom symmetrical structure in the preferred version, bucket tooth is stressed relatively dispersion, even in use, be not easy cracking, and the excavating tooth assembly that combines of the bucket tooth that provides and toothholder, the stressed of bucket tooth chamber and toothholder head matching part can effectively be improved.

Description of drawings

Fig. 1 is the perspective exploded view of the utility model embodiment power shovel tooth assembly;

Fig. 2 is the perspective view of the utility model embodiment digger shovel toothholder;

Fig. 3 is the perspective view of toothholder other direction shown in Figure 2;

Fig. 4 is the sectional structure schematic diagram that the utility model is implemented dipper teeth of digging machine;

Fig. 5 is the B-B sectional view of bucket tooth shown in Figure 4;

Fig. 6 is the C-C sectional view of bucket tooth shown in Figure 4;

Fig. 7 is the utility model embodiment power shovel tooth assembly that is subject to offset placed load;

Fig. 8 has illustrated the everywhere stressing conditions of the utility model embodiment power shovel tooth assembly when the bucket tooth front end suffers external force;

Fig. 9 is the existing everywhere stressing conditions of power shovel tooth assembly when the bucket tooth front end suffers external force;

Figure 10 is the A-A sectional view of Fig. 8, and simultaneously it has illustrated the inside stressing conditions of bucket tooth rear portion when suffering offset placed load;

Figure 11 is the D-D sectional view of Fig. 8, and simultaneously it has illustrated the inside stressing conditions of bucket tooth front portion when suffering offset placed load.

The specific embodiment

The utility model is described in further detail below to reach in conjunction with the drawings embodiment.

As shown in Figure 1, an embodiment of power shovel tooth assembly comprises toothholder 1, bucket tooth 2 and locking pin member.Locking pin member comprises pin 3 and snap ring 4.There is the bucket tooth chamber 20 of open rearward end at bucket tooth 2 rear portions, and there is toothholder head 10 toothholder 1 front portion, are equipped with lockpin hole on bucket tooth chamber 20 and the toothholder head 10, and toothholder head 10 is contained in bucket tooth chamber 20 and affixed by locking pin member as shown in Figure 7.All the large front end in rear end is little substantially for bucket tooth chamber 20 and toothholder head 10, and the external surface shape of the inner surface in bucket tooth chamber 20 and toothholder head 10 is complementary.

Such as Fig. 1, Fig. 2, shown in Figure 3, toothholder head 10 has the front end face 71 of central axis (being the X-axis line among Fig. 1, Fig. 2, Fig. 3, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9) formation that is orthogonal to this toothholder head 10, the top of toothholder head 10 provides two groups of fitting faces and one group of transition face, i.e. first group of fitting face, first group of transition face and the 3rd group of fitting face.The first assembly is closed face and is comprised that fitting face 11, fitting face 12,13, the first groups of transition faces of fitting face comprise that face 21, face 22, face 23, face 24, the three assembly close face and comprise fitting face 31, fitting face 32, fitting face 33.The bottom of toothholder head 10 also provides two groups of fitting faces and one group of transition face, i.e. second group of fitting face, second group of transition face and the 4th group of fitting face.The second assembly is closed face and is comprised that fitting face 41, fitting face 42,43, the second groups of transition faces of fitting face comprise that face 51, face 52, face 53, face 54, the four assembly close face and comprise fitting face 61, fitting face 62, fitting face 63.The first group of fitting face in top connects by first group of transition face with the 3rd group of fitting face, the second group of fitting face in bottom connects by second group of transition face with the 4th group of fitting face, fitting face 12,32,42,62 and X-axis line almost parallel, the fitting face 11 and 13 of every group of both sides, 31 and 33,41 and 43,61 with 63 respectively with every group in the middle of the angles be scheduled to of fitting face 12,32,42,62 one-tenths, and the angle of angle is identical, preferred 120 ~ 150 degree of angle.The 3rd group of fitting face and the 4th group of fitting face connect respectively the front end face 71 of toothholder head 10.

Above-mentioned front end face 71 is arcwall face, and all fitting faces of toothholder head 10 are plane or almost plane.

The upper and lower of toothholder head 10 is symmetrical, and the plane of symmetry is the plane that is parallel to the fitting face in the middle of being positioned in every group of fitting face and crosses described central axis X.As shown in Figure 1, the both sides of toothholder head 10 all have the side joint face 100 that connects toothholder head top and toothholder head bottom, and side joint face 100 is the plane, and perpendicular to the described plane of symmetry.Simultaneously, toothholder head 10 or symmetrical.

Four faces in above-mentioned first group of transition face and the second group of transition face are all symmetrical about central axis X in twos, and the angle that becomes to be scheduled to central axis X.

Such as Fig. 4, Fig. 5, shown in Figure 6, the inner surface in the bucket tooth chamber 20 of bucket tooth 2 provides the fitting face that contacts respectively cooperation with the fitting face on the toothholder head 10, namely contacts respectively a plurality of fitting faces 11 ', 12 ', 13 ', 31 ', 32 ', 33 ', 41 ', 42 ', 43 ', 61 ', 62 ', 63 ' that cooperate with fitting face 11,12,13,31,32,33,41,42,43,61,62,63 on the toothholder head 10.The inner surface in the bucket tooth chamber 20 of bucket tooth 2 also provide respectively with toothholder head 10 on transition face 21,22,23,24,51,52,53,54 corresponding and maintain certain distance and discontiguous a plurality of 21 ', 22 ', 23 ', 24 ', 51 ', 52 ', 53 ', 54 '.The inner surface in the bucket tooth chamber 20 of bucket tooth 2 also provides and contacts the bottom face 71 ' that cooperates with front end face 71 on the toothholder head 10, also provides simultaneously the inside wall corresponding with the side joint face 100 of toothholder head.Maintaining certain gap between the side joint face 100 of the inside wall in bucket tooth chamber 20 and toothholder head 10 maybe can form to contact to cooperate and all can.

From the above mentioned as can be known, it is freely unrestricted only having along X-axis line direction after toothholder 1 and bucket tooth 2 assemblings, by putting into the given constraint that this side up of locking pin member, institute thinks that pin fracture or the fracture of bucket tooth 2 pin-and-hole places cause Problem of Failure, must consider to be parallel to the excavation component of X-axis line direction, in the bucket operation process stressed as shown in Figure 8 (take bucket tooth 2 as the force analysis object), dash area represents the bucket labial lamina of bucket among the figure.It is that F1(is through the power after simplifying that bucket tooth 2 is subjected to external force), fitting face 32,42 pairs of bucket tooths 2 have played the effect of supporting at this moment, produce directed force F 2 at fitting face 32 ', produce directed force F 3 at fitting face 42 ', and the relation of F2=F1+F3 is arranged.Because fitting face 32,32 ', 42,42 ' and the X-axis line parallel, directed force F 2, F3 are perpendicular to fitting face 32,32 ', 42,42 ', do not produce along the component on the X-axis line direction (even bucket tooth 2 and toothholder 1 out of gear mesh active force), eliminated like this pin 3 cut off destroy or under the shearing force effect sharp worn may, thereby guaranteed the stability of whole assembly.Because the fitting face of bucket tooth 1 and toothholder 2 is to be symmetrical arranged along the X-axis line, when bucket tooth 2 is subjected to force direction and F1 opposite direction, also has above-mentioned stressed relation.Traditional bucket tooth fitting face and X-axis line all have a certain degree as shown in Figure 9, when being subject to external force F1, bucket tooth does the time spent, F3 is resolved into orthogonal component F4 and F5, and component F4 is parallel to the X-axis line, and component F4 will all pass to pin and cause pin probably to be cut off.

Many group fitting faces are set on the toothholder head 10, has very large advantage, tradition toothholder head 10 fitting faces only have two to be mutually certain angle with the X-axis line and about the fitting face of X-axis line symmetry, the area of its overall fitting face is less than the fitting face gross area of this many group fitting face modes, and the fitting face size is directly connected to stressing conditions, load is just less in the larger unit area of contact surface, and is stressed also more even.

As shown in Figure 7; the dipper teeth assembly is stressed in operation process to be multidimensional; when bucket tooth 2 is subject to offset load P; the active force that departs from the X-axis line will produce moment of torsion M; A-A line profile position (is fitting face 11 in the corresponding diagram 8; 11 '; 12; 12 '; 13; 13 '; 41; 41 '; 42; 42 '; 43; 43 ' locates); Figure 10 has shown the section of a bucket tooth embodiment; because foozle; there is fit clearance between toothholder 1 and the bucket tooth 2; bucket tooth 2 will be rotated along X-axis wire-wound toothholder 1; turning to certain position blocks because of the fitting face contact; contact point is 81; 82; 83 and 84; wherein 82 at fitting face 13; on 13 '; 84 at fitting face 41; on 41 '; 81 at fitting face 12; on 12 '; 83 at fitting face 42; on 42 '; this moment fitting face 13; 41; 12; 42 play the effect that opposing bucket tooth 2 rotates around the X-axis line; by increasing fitting face 13; 41; more fitting face hinders reversing of bucket tooth 2; so that bucket tooth 2 is firm placed in the middle; and avoid bucket tooth 2 or toothholder 1 certain position to produce stress and concentrate, the active force that is subject to is distributed to 81; 82; 83; 84 places, in addition D-D line profile position in the corresponding diagram 8; Figure 11 has shown the fitting face 32 of toothholder 2; 33; 61; 62 also play and fitting face 12; 13; 41; 42 same effects; the rotary action of the opposing bucket tooth 2 that produces by more fitting face prevents from causing the fracture in bucket tooth 2 and toothholder 1 mating part somewhere, protects simultaneously pin 3 not to be subject to shear failure and flexural deformation.Similarly, fitting face 11,12,42,43,31,32,52,63 act as hinder bucket tooth 2 because of be applied in around the reciprocal moment of torsion M ' of X-axis line around toothholder 1 rotation.

The bottom face of bucket tooth 2 provides the essence opposing to the external force F5 that is applied to bucket tooth 2 along the X-axis line as shown in Figure 8, other fitting face 32 ', 42 ' because with the X-axis line parallel, this moment, suffered power can be ignored, and further strengthened stability and the safety of fit structure.

As Figure 10, bucket tooth shown in Figure 11 2 be subject to two sides along the power F6 that comes perpendicular to X-axis line direction, the fitting face 13,43,33,63 of toothholder 1 plays resistant function and responds F6 and makes bucket tooth 2 stable to neutralizing on toothholder 1.Similarly, bucket tooth 2 be subject to two sides along the power F6 ' that comes perpendicular to X-axis line direction, the fitting face 11,41,31,61 of toothholder 1 plays resistant function and responds F6 ' and makes bucket tooth 2 stable to neutralizing on toothholder 1.

After bucket tooth 2 and toothholder 1 cooperated as shown in Figure 7, the lockpin hole on the two formed connecting through hole 30, and pin 3 is placed in this through hole 30, and snap ring 4 is waled pin 3, and the restriction pin is mobile in through hole, thereby reached bucket tooth 2 and the constraint of toothholder 1 on the disengaging direction.

Claims (9)

1. stable digger shovel toothholder, the front portion of toothholder has the toothholder head with lockpin hole, the large front end in rear end is little substantially for the toothholder head, it is characterized in that the front end of toothholder head has the front end face of the central axis that is orthogonal to this toothholder head, the top of toothholder head is provided with the 3rd group of fitting face, first group of transition face and first group of fitting face successively from front end face, the bottom of toothholder head is provided with the 4th group of fitting face, second group of transition face and second group of fitting face successively from front end face, the both sides of toothholder head have the side joint face that connects toothholder head top and toothholder head bottom; Aforesaid front end face and all fitting faces refer to that all aforesaid all transition faces then maintain certain distance with the corresponding inner surface in bucket tooth chamber and the inner surface contact cooperation of not somersault tooth cavity for the face of somersault tooth cavity respective inner surfaces contact cooperation; Aforesaid every group of fitting face includes at least three and laterally is arranged in order and symmetrically arranged fitting face, become default obtuse angle between each adjacent fitting face, and the fitting face in the middle of being positioned in every group of fitting face is parallel with described central axis, and the fitting face that is positioned at both sides is then parallel with described central axis or along the from back to front slightly contraction of described central axial direction.

2. digger shovel toothholder according to claim 1 it is characterized in that described front end face is arcwall face, and all fitting faces of described toothholder head is plane or almost plane.

3. digger shovel toothholder according to claim 1 and 2, it is characterized in that described the 3rd group of fitting face is identical with the number of fitting face in first group of fitting face, and in the 3rd group of fitting face in the angle between each adjacent fitting face and the first group of fitting face angle between each corresponding adjacent fitting face identical; Described the 4th group of fitting face is identical with the number of fitting face in second group of fitting face, and in the 4th group of fitting face in the angle between each adjacent fitting face and the second group of fitting face angle between each corresponding adjacent fitting face identical.

4. digger shovel toothholder according to claim 3 is characterized in that every group of fitting face forms by three fitting faces in left, center, right on the described toothholder head, and the angle between each two adjacent fitting face is identical in every group of fitting face, is 120～150 degree.

5. according to claim 3 or 4 described digger shovel toothholders, it is characterized in that the upper and lower of described toothholder head is symmetrical, the plane of symmetry is the plane that is parallel to the fitting face in the middle of being positioned in every group of fitting face and crosses described central axis.

6. digger shovel toothholder according to claim 4, it is characterized in that described first group of transition face and second group of transition face all are comprised of four faces that laterally are arranged in order, and symmetrical about described central axis in twos, and the angle that becomes to be scheduled to described central axis.

7. digger shovel toothholder according to claim 5 is characterized in that described side joint face is the plane, and perpendicular to the described plane of symmetry.

8. stable dipper teeth of digging machine, the rear portion of bucket tooth has the bucket tooth chamber of open rearward end, the two side, rear portion in bucket tooth chamber is provided with lockpin hole, the large front end in rear end is little substantially in the bucket tooth chamber, the external surface shape that it is characterized in that the toothholder head of the described digger shovel toothholder of arbitrary claim in the inner surface in described bucket tooth chamber and the claim 1～7 is complementary, and divided by the contact of the corresponding position lower position outside cooperation:

Maintain certain distance between first group of transition face in bucket tooth chamber and the first group of transition face of described toothholder head and between second group of transition face of second group of transition face in bucket tooth chamber and described toothholder head, simultaneously, maintaining certain gap between the side joint face of the inside wall in bucket tooth chamber and described toothholder head maybe can form and contact cooperation.

9. stable power shovel tooth assembly, comprise bucket tooth, toothholder and locking pin member, the rear portion of bucket tooth has the bucket tooth chamber of open rearward end, the front portion of toothholder has the toothholder head, this toothholder head is contained in the bucket tooth chamber of bucket tooth, bucket tooth chamber and the toothholder head of bucket tooth are firmly combined by locking pin member, it is characterized in that: the bucket tooth chamber of bucket tooth has the inner surface with the external surface complementation of toothholder head, and cooperates divided by the contact of the corresponding position outside the lower position:

Maintain certain distance between first group of transition face in bucket tooth chamber and the first group of transition face of described toothholder head and between second group of transition face of second group of transition face in bucket tooth chamber and described toothholder head, simultaneously, maintaining certain gap between the side joint face of the inside wall in bucket tooth chamber and described toothholder head maybe can form and contact cooperation;

The front end of toothholder head has the front end face of the central axis that is orthogonal to this toothholder head, the top of toothholder head is provided with the 3rd group of fitting face, first group of transition face and first group of fitting face successively from front end face, the bottom of toothholder head is provided with the 4th group of fitting face, second group of transition face and second group of fitting face successively from front end face, the both sides of toothholder head are provided with the side joint face that connects toothholder head top and toothholder head bottom; Aforesaid every group of fitting face includes at least three and laterally is arranged in order and symmetrically arranged fitting face, become default obtuse angle between each adjacent fitting face, and the fitting face in the middle of being positioned in every group of fitting face is parallel with described central axis, and the fitting face that is positioned at both sides is then parallel with described central axis or along the from back to front slightly contraction of described central axial direction.

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