CN214463924U - Novel cutting pick - Google Patents
Novel cutting pick Download PDFInfo
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- CN214463924U CN214463924U CN202023233885.XU CN202023233885U CN214463924U CN 214463924 U CN214463924 U CN 214463924U CN 202023233885 U CN202023233885 U CN 202023233885U CN 214463924 U CN214463924 U CN 214463924U
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- cutting pick
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Abstract
The embodiment of the utility model provides a novel cutting pick, which comprises a cutting pick upper part and a cutting pick body connected below the cutting pick upper part; the upper part of the cutting pick comprises a tool bit and a tool holder; the cutter seat comprises a disk-shaped cutter seat body and a column end, and the cutter head is fixed at the central position of the top surface of the cutter seat body; the top end of the cutting pick body is a horizontally arranged end plane, a column end matching hole is formed in the end plane, and the column end extends into the column end matching hole; the end plane is attached to the lower portion of the bottom plane. According to the technical scheme, the tool bit part or the cutting pick body can be independently replaced, the problem that threads of the existing detachable tool bit type cutting pick are damaged and cannot be detached is solved, and the high economic value is achieved.
Description
Technical Field
The utility model relates to an engineering construction technical field, concretely relates to novel pick.
Background
The rotary drilling rig is widely applied to limited space operation such as underground excavation engineering construction operation of subways as a mining and tunneling machine. The cutting tooth is a cutting part on the rotary drilling rig, bears higher periodic compressive stress, shearing stress and impact load when cutting hard rock, and the temperature of the cutting tooth can also rise due to friction and impact in the process of cutting the rock mass.
In a conventional cutting pick, a cutting head at the top end of the cutting pick and a cutting pick body are integrally connected together, and if the cutting pick needs to be replaced, the whole cutting pick needs to be replaced. However, in many cases, only the cutting tip is worn and the cutting pick body is still in a good usable state, and in some cases, the cutting pick body is damaged and the cutting tip at the top is still good, and in these cases, if the whole cutting pick is scrapped and replaced, a large amount of waste of material is caused.
Aiming at the problem, the existing solution is to manufacture a section of screw at the bottom of the cutter head, correspondingly set threads on the cutting pick body, and connect the cutter head and the cutting pick body by threads, so that the cutter head and the cutting pick body are of a split structure, and the two parts can be independently replaced.
In the process of implementing the present invention, the inventor finds that there are at least the following problems in the prior art:
the bottom of the detachable cutter head in the prior art is directly made into a screw form and screwed on the cutting tooth body, and the size of the connecting thread on the screw protruding below the cutter head is smaller because the cutter head is smaller. The pick works in high impact, high temperature, high stress state for a long time, the huge impact force of during operation is directly transmitted to the screw thread through the tool bit, in addition the tool bit still receives very big and pick axis vertically lateral force, the torsional moment that this lateral force produced also is used in the screw thread root, consequently after using a period, leads to the emergence of the condition such as screw thread damage, deformation even screw thread interlock, fracture very easily, leads to the unable dismantlement of alloy head and pick body, can only whole change. Therefore, how to obtain a reliable split type cutting pick is a problem to be solved.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a novel pick has solved among the prior art detachable tool bit often because the impaired problem that can't be dismantled of screw thread.
In order to achieve the purpose, the embodiment of the utility model provides a novel cutting pick, which comprises a cutting pick upper part and a cutting pick body which is detachably connected below the cutting pick upper part;
the upper part of the cutting pick comprises a tool bit and a tool holder; the tool apron comprises a disc-shaped tool apron body and a column end, the bottom plane of the tool apron body is a plane, the column end is connected below the tool apron body and is coaxial with the tool apron body, and the sectional area of the tool apron body is larger than that of the column end; the cutter head is fixedly connected to the center of the top surface of the cutter seat body;
the cutting pick body is a rotary body structure which is symmetrical along the axis of the cutting pick body, the top end of the cutting pick body is a horizontally arranged end plane, a column end matching hole is formed in the end plane, and the column end matching hole is coaxial with the cutting pick body;
the column end extends into the column end matching hole;
the end plane is attached to the lower portion of the bottom plane.
Preferably, the column end is a cylinder, and the column end matching hole is a circular hole; and the outer diameter of the column end is in transition fit with the inner diameter of the column end matching hole.
Preferably, the column end is a square column body, and the column end matching hole is a square hole.
Preferably, the novel cutting pick further comprises a fastening screw; a cylindrical pin shaft is arranged at the tail of the threaded end of the fastening screw, and the pin shaft is coaxial with the threaded end and has an outer diameter smaller than the small diameter of the thread of the threaded end; the upper part of the pick body is horizontally provided with a threaded counter bore from outside to inside; an annular limiting groove is formed in the bottom of the cutter holder, and the groove width of the limiting groove is larger than the outer diameter of the pin shaft; the fastening screw is screwed in the thread counter bore, and the pin shaft penetrates into the limiting groove.
Preferably, the thread counter bores are one or more and are uniformly distributed along the axial direction of the pick body; the fastening screws are one or more and are uniformly distributed along the axial line of the cutting pick body in the radial direction.
Preferably, the depth of the post end mating hole is greater than the height of the post end.
Preferably, a threaded hole is further formed in the pick body, and the threaded hole is coaxial with the pick body and penetrates through the pick body up and down.
Preferably, a positioning groove is formed in the top end of the cutter holder; the lower part of the cutter head is arranged in the positioning groove; the tool bit is fixedly connected with the tool apron in a welding mode.
Preferably, in the tool apron body, the bottom plane is larger than the top plane, and the outer contour line of the side surface is an arc edge; the radius of the bottom plane is the same as the radius of the end plane.
Preferably, the novel cutting pick further comprises a cutting pick clamp spring which is of a ring-shaped structure with a crack in the middle.
The technical scheme has the following beneficial effects:
when the cutting pick works, the huge impact force applied to the cutter head is transmitted to the end plane at the top end of the cutting pick body through the cutter holder, and the sectional area of the cutter holder is far larger than that of a screw at the bottom of the cutter head in the prior art, so that the stress is small; and the upper part of the cutting tooth is matched with the cutting tooth body through the shaft hole, the torsional moment generated by the lateral force is born by the side wall of the column end matching hole during working, and the capability of resisting damage is far stronger than that of a thread tooth in the prior art. Therefore, compare in current detachable pick, this technical scheme's pick can not produce the screw thread and warp, the condition such as lock, has avoided unable dismantlement scheduling problem, can conveniently carry out the change of tool bit or pick body to the expense has been saved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view of an assembly structure of a novel cutting pick according to an embodiment of the invention;
FIG. 2 is a schematic illustration of a component construction of a pick body in an embodiment of the invention;
FIG. 3 is a schematic view of the components of the upper portion of the cutting pick in an embodiment of the invention;
fig. 4 is a schematic structural view of a fastening screw according to an embodiment of the present invention;
fig. 5 is a schematic view of the overall structure of the novel cutting pick according to the embodiment of the invention;
fig. 6 is a schematic view of the novel cutting pick according to the embodiment of the invention when being disassembled;
reference numerals: 10. the upper part of the cutting pick; 11. a cutter head; 12. a tool apron; 121. a tool post body; 122. a column end; 123. a bottom plane; 214. a limiting groove; 125. a positioning groove; 20. a pick body; 21. a threaded counter bore; 22. a threaded hole; 23. a post-end mating hole; 24. an end plane; 30. fastening screws; 31. a pin shaft; 40. a cutting pick clamp spring; 50. and (5) disassembling and replacing the screw rod.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1, 2 and 3, the present invention provides a novel cutting pick, which comprises a cutting pick upper part and a cutting pick body 20 detachably connected below the cutting pick upper part 10;
the cutting pick upper part 10 comprises a tool bit 11 and a tool holder 12; the tool apron 12 includes a disc-shaped tool apron body 121 and a column end 122, a bottom plane 123 of the tool apron body 121 is a horizontally arranged circular plane, the column end 122 is connected below the tool apron body 121 and is coaxial with the tool apron body 121, and a sectional area of the tool apron body 121 is larger than a sectional area of the column end 122; the tool bit 11 is fixedly connected to the center of the top surface of the tool holder body 121;
the pick body 20 is a rotary body structure which is symmetrical along the axis of the pick body, the top end of the pick body is a horizontally arranged end plane 24, a column end matching hole 23 is formed in the end plane 24, and the column end matching hole 23 is coaxial with the pick body 20;
the column end 122 penetrates into the column end fitting hole 23;
the end plane 24 is attached below the bottom plane 123.
In the tunneling operation of the cutting pick, the cutter head with the highest hardness at the topmost end of the cutting pick is the main cutting part and is firstly contacted with rock strata and the like, so that the main impact force in the cutting process is transmitted to the cutting pick body through the cutter head. Among the current removable pick, be subject to the size of tool bit, the size of the connecting screw rod that is located its below is also less, and the during operation leads to screw thread damage, screw thread interlock even screw rod rupture easily.
In order to avoid the problem, the cutter head is fixed on the cutter holder on the upper part of the cutting tooth, and the impact force to be received by the bottom plane of the cutter holder body is transmitted to the end plane at the top end of the cutting tooth body during working. The cutter holder can be made to be much larger than the cutter head, and the contact surface area is much larger than that of a screw arranged at the bottom of the cutter head in the prior art, so that the stress is small during working; and the bottom of the tool apron is provided with a column end, and the column end is matched with the shaft hole between the cutting pick bodies, so that the torsional moment generated by the lateral force is borne by the side wall of the column end matching hole during working, and the anti-damage capability of the tool apron is far stronger than that of a thread in the prior art. Therefore, the design scheme can effectively improve the connection strength between the tool apron and the cutting pick body, the conditions of thread deformation, engagement and the like can not be generated, and the problems of incapability of disassembly and the like are avoided.
Although the tool holder needs to be replaced when the tool bit is replaced, the tool holder is still a small part relative to the whole cutting pick, the material cost is low, and the tool holder still has obvious economic value compared with the problems that threads are damaged and cannot be detached frequently in the existing cutting pick with the replaceable tool bit.
Preferably, the column end 122 is a cylinder, and the column end fitting hole 23 is a circular hole; and the outer diameter of the column end 122 is in transition fit with the inner diameter of the column end fitting hole 23.
The connection form of the column end and the column end matching hole can be various, wherein the matching of the circular shaft hole is the most common mode, and the processing is convenient in practical use, so the method can adopt the matching mode of the cylindrical shaft and the circular hole.
Preferably, the column end 122 is a square column, and the column end fitting hole 23 is a square hole.
When special needs exist, in order to prevent the cutter holder and the cutting pick body from rotating relatively, the circular shaft hole matching is changed into the square shaft hole matching. The column end is a square shaft with a square section, and the column end matching hole is a square hole with a square section. When the square shaft and the square hole are adopted, the machining difficulty is high, and the standard fit tolerance is avoided, so that the fit clearance is properly enlarged, and the section size of the square hole is larger than that of the square shaft.
Preferably, as shown in fig. 4, the novel cutting pick further comprises a fastening screw 30; a cylindrical pin shaft is arranged at the tail of the threaded end of the fastening screw 30, and the pin shaft is coaxial with the threaded end and has an outer diameter smaller than the small diameter of the thread of the threaded end; as shown in fig. 1, a threaded counter bore 21 is horizontally arranged at the upper part of the pick body 20; an annular limiting groove 124 is formed in the bottom of the tool apron 12, and the groove width of the limiting groove 124 is larger than the outer diameter of the pin shaft; the fastening screw 30 is screwed in the threaded counter bore 21, and the pin shaft penetrates into the limiting groove 124.
The impact force applied to the cutter head is from outside to inside, and the upper part of the cutting pick is pressed on the cutting pick body under the normal condition. However, in order to prevent the upper part of the cutting pick from falling off accidentally under specific conditions, a transverse threaded counter bore is arranged on the cutting pick body, the counter bore is arranged on the outer surface, a fastening screw is arranged in the counter bore, and the column end is fixed through the fastening screw, so that the upper part of the cutting pick cannot fall off. In order to obtain better effect, an annular groove is arranged at the position close to the lower part of the column end, the tail end of the thread of the fastening screw is made into a cylindrical pin shaft, and the annular groove is clamped by the pin shaft, so that the upper part of the cutting pick cannot move axially, and the cutting pick can be reliably fixed.
Preferably, the number of the thread counter bores 21 is one or more, and the thread counter bores are uniformly distributed along the axial direction of the pick body 20; the fastening screws 30 are one or more and are uniformly distributed along the axial direction of the pick body 20.
The fastening screws can be distributed uniformly along the radial direction of the axis, and the number is preferably 2-4.
Preferably, as shown in fig. 1, the post end mating hole 23 has a depth greater than the height of the post end 122.
When the depth of the column end fitting hole is smaller than the height of the column end, the bottom plane and the end plane of the tool holder body cannot be completely attached, and therefore the depth of the column end fitting hole needs to be properly enlarged.
Preferably, as shown in fig. 2, a threaded hole 22 is further provided in the pick body 20, and the threaded hole 22 is coaxial with the pick body 20 and vertically penetrates through the pick body 20.
When the cutter head or the cutting pick body is replaced, due to long-time use, more impurities are deposited at the matching position of the shaft hole, the matching surface is possibly slightly deformed to cause difficulty in manual disassembly, at the moment, as shown in fig. 6, the disassembly and replacement screw 50 can be screwed into the threaded hole, and in the screwing process, the plane at the top end of the disassembly and replacement screw 50 abuts against the bottom surface of the column end and gradually ejects the upper part of the whole cutting pick. The major diameter of the thread of the threaded hole is smaller than the aperture of the column end matching hole, so that the side wall of the column end matching hole is prevented from being damaged by disassembling and replacing the screw 50 in the ejection process.
Preferably, as shown in fig. 3, the top end of the tool holder 12 is provided with a positioning groove 125; as shown in fig. 1, the lower portion of the cutter head 11 is placed in the positioning groove 125; the tool bit 11 and the tool apron 12 are fixedly connected in a welding mode.
In the conventional technology, the cutter head is directly welded on the cutting pick body, and in order to ensure the connection strength, the cutting pick body and the cutting pick body are connected in a welding mode; through burying the latter half of tool bit into positioning groove, can make the connection more reliable.
Preferably, as shown in fig. 1, in the tool holder body 121, the bottom plane 123 is larger than the top plane, and the outer contour of the side surface is an arc edge; the radius of the bottom plane 123 is the same as the radius of the end plane 24.
Usually, the cutting pick is in a bullet shape with a sharp front end and a wide back end, so that the side surface of the tool apron is in an arc shape, and the tool apron and the cutting pick body can form smooth transition in shape, so that obvious bulges or depressions are avoided, and further the adverse effect on the tunneling work can be avoided.
Preferably, as shown in fig. 3, the novel cutting pick further comprises a cutting pick clamp spring 40, and the cutting pick clamp spring 40 is of a split annular structure in the middle.
The cutting pick snap spring is an alloy washer with a middle part split similar to a Z-shaped gap, and a fastener of a drilling machine can be inserted into the washer through mortise and tenon connection to fix the cutting pick, so that the cutting pick body is simple and convenient to mount and dismount.
The assembled pick is shown in figure 5.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. To those skilled in the art; various modifications to these embodiments will be readily apparent, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A novel cutting pick, comprising: a pick upper portion (10) and a pick body (20) removably connected below the pick upper portion (10);
the cutting pick upper part (10) comprises a tool bit (11) and a tool apron (12); the tool apron (12) comprises a disc-shaped tool apron body (121) and a column end (122), a bottom plane (123) of the tool apron body (121) is a horizontally arranged circular plane, the column end (122) is connected below the tool apron body (121) and is coaxial with the tool apron body (121), and the sectional area of the tool apron body (121) is larger than that of the column end (122); the tool bit (11) is fixedly connected to the center of the top surface of the tool holder body (121);
the pick body (20) is a rotary body structure which is symmetrical along the axis of the pick body, the top end of the pick body is a horizontally arranged end plane (24), a column end matching hole (23) is formed in the end plane (24), and the column end matching hole (23) is coaxial with the pick body (20);
the column end (122) penetrates into the column end matching hole (23);
the end plane (24) is attached below the bottom plane (123).
2. A novel cutting pick according to claim 1, wherein said stub (122) is a cylindrical body and said stub mating bore (23) is a circular bore; and the outer diameter of the column end (122) is in transition fit with the inner diameter of the column end fitting hole (23).
3. A novel cutting pick according to claim 1, wherein said post end (122) is a square cylinder and said post end mating bore (23) is a square bore.
4. A new cutting pick according to claim 1, further comprising a fastening screw (30); a cylindrical pin shaft (31) is arranged at the tail end of the threaded end of the fastening screw (30), and the pin shaft (31) is coaxial with the threaded end and has an outer diameter smaller than the small diameter of the thread of the threaded end; a threaded counter bore (21) is horizontally arranged at the upper part of the pick body (20); an annular limiting groove (124) is formed in the bottom of the cutter holder (12), and the groove width of the limiting groove (124) is larger than the outer diameter of the pin shaft; the fastening screw (30) is screwed in the threaded counter bore (21), and the pin shaft (31) penetrates into the limiting groove (124).
5. A novel cutting pick according to claim 4, wherein said threaded counterbores (21) are one or more and are radially equispaced along the axis of said pick body (20); the number of the fastening screws (30) is one or more, and the fastening screws are uniformly distributed along the axial direction of the pick body (20).
6. A novel cutting pick according to claim 1, wherein said stub mating bore (23) has a depth greater than the height of said stub (122).
7. A novel cutting pick according to claim 1, wherein a threaded bore (22) is provided in the pick body (20), said threaded bore (22) being coaxial with the pick body (20) and extending up and down through the pick body (20).
8. A new cutting pick according to claim 1, wherein the top end of the holder (12) is provided with a positioning groove (125); the lower part of the cutter head (11) is arranged in the positioning groove (125); the tool bit (11) and the tool apron (12) are fixedly connected in a welding mode.
9. A novel cutting pick according to claim 1, wherein in said pick body (121), the bottom plane (123) is larger than the top plane, and the outer profile of the side surface is an arc edge; the radius of the bottom plane (123) is the same as the radius of the end plane (24).
10. A novel cutting pick according to claim 1, further comprising a cutting pick retaining spring (40), said cutting pick retaining spring (40) being of split annular configuration with a middle portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023233885.XU CN214463924U (en) | 2020-12-29 | 2020-12-29 | Novel cutting pick |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023233885.XU CN214463924U (en) | 2020-12-29 | 2020-12-29 | Novel cutting pick |
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| Publication Number | Publication Date |
|---|---|
| CN214463924U true CN214463924U (en) | 2021-10-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202023233885.XU Active CN214463924U (en) | 2020-12-29 | 2020-12-29 | Novel cutting pick |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112696206A (en) * | 2020-12-29 | 2021-04-23 | 北京城建轨道交通建设工程有限公司 | Cutting pick for rotary drilling rig |
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2020
- 2020-12-29 CN CN202023233885.XU patent/CN214463924U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112696206A (en) * | 2020-12-29 | 2021-04-23 | 北京城建轨道交通建设工程有限公司 | Cutting pick for rotary drilling rig |
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