CN216554738U - Thread biting prevention device for pile clamping oil cylinder - Google Patents
Thread biting prevention device for pile clamping oil cylinder Download PDFInfo
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- CN216554738U CN216554738U CN202122718564.7U CN202122718564U CN216554738U CN 216554738 U CN216554738 U CN 216554738U CN 202122718564 U CN202122718564 U CN 202122718564U CN 216554738 U CN216554738 U CN 216554738U
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- guide sleeve
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- cylinder barrel
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Abstract
The utility model discloses a device for preventing threads from biting threads of a pile clamping oil cylinder, which comprises a cylinder barrel and a guide sleeve, wherein the guide sleeve is assembled in the cylinder barrel in a threaded manner, the front part of the guide sleeve is provided with external threads matched with the cylinder barrel, a positioning gap is formed between the rear part of the guide sleeve and the cylinder barrel, and the positioning gap is positioned behind the tail end of the external threads. The pile clamping oil cylinder prevents the threads from biting the threads, replaces the external threads at the rear part of the guide sleeve with the positioning gaps, and can effectively solve the problem of thread biting caused by undersize gaps caused by thread matching errors at the front part.
Description
Technical Field
The utility model relates to the technical field of hydraulic equipment, in particular to a device for preventing threads from biting threads of a pile clamping oil cylinder.
Background
Hydraulic cylinders are used as important actuators in hydraulic systems and are widely used in various devices.
As an important part of the hydraulic oil cylinder, the connecting mode of the guide sleeve and the cylinder barrel is various. The threaded connection has wide application on the oil cylinder as a connection mode with simple processing, quick assembly and good stress performance. Although the threaded connection has many advantages, the threaded connection has inherent defects of thread biting and the like, and particularly in the structure of the hydraulic oil cylinder, the thread biting failure rate is high when the cylinder barrel of the threaded connection is assembled and disassembled with the guide sleeve due to accumulated errors and defects of machining, assembly and the like.
Therefore, how to provide a pile clamping oil cylinder thread biting prevention device which solves the technical problems is a technical problem which needs to be solved urgently by the technical personnel in the field.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a device for preventing threads from biting threads of a pile clamping oil cylinder, which replaces external threads on the rear part of a guide sleeve with a positioning gap and can effectively solve the problem of thread biting caused by too small gap due to the matching error of the threads on the front part.
In order to achieve the purpose, the utility model provides a device for preventing threads from biting threads for a pile clamping oil cylinder, which comprises a cylinder barrel and a guide sleeve assembled in the cylinder barrel in a threaded manner, wherein the front part of the guide sleeve is provided with external threads matched with the cylinder barrel, and a positioning gap is arranged between the rear part of the guide sleeve and the cylinder barrel and is positioned behind the tail end of the external threads.
Preferably, the inner side of the cylinder barrel is provided with a positioning inner hole with a radial dimension larger than that of the external thread, and the positioning gap is located between the positioning inner hole and the guide sleeve.
Preferably, the outer side of the guide sleeve is provided with a positioning excircle with a radial dimension smaller than that of the external thread, and the positioning gap is located between the positioning excircle and the cylinder barrel.
Preferably, the inner side of the cylinder barrel is provided with a positioning inner hole with a radial dimension larger than that of the external thread, the outer side of the guide sleeve is provided with a positioning outer circle with a radial dimension smaller than that of the external thread, and the positioning gap is located between the positioning inner hole and the positioning outer circle.
Preferably, the guide sleeve further comprises a set screw arranged on the cylinder barrel, and the set screw is used for locking the guide sleeve after the guide sleeve is assembled.
Preferably, the cylinder barrel is provided with a screw hole for assembling the set screw, and the guide sleeve is provided with an outer ring groove for clamping the set screw.
Compared with the prior art, the pile clamping oil cylinder has different guide sleeves in the thread biting prevention device; in the thread fit of the guide sleeve and the cylinder barrel, the guide sleeve is not provided with external threads in the full length, the front part retains the external threads matched with the threads, and the rear part, namely the tail end, replaces the external threads with a positioning gap; when the guide sleeve is used, local errors exist on the external threads of the front part, accumulated errors of thread pitches depend on the screwing length, the accumulated errors can be reflected on the rear part of the guide sleeve, the problem that the gap caused by the thread matching errors of the front part is too small can be solved through the positioning gap, a sufficient space is reserved between the guide sleeve and the cylinder barrel, and the problem of wire biting caused by the screwing interference of the guide sleeve and the cylinder barrel threads due to the accumulated errors is prevented.
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 embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is an application schematic diagram of a thread biting prevention device for a pile clamping oil cylinder according to an embodiment of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is a schematic view of the assembly of an unmodified prior art guide sleeve;
fig. 4 is an oblique assembly view of the thread biting prevention device for the pile clamping oil cylinder according to the embodiment of the utility model.
Wherein:
10-cylinder barrel, 20-guide sleeve, 30-cylinder head, 40-piston rod, 12-positioning gap, 21-set screw, 101-positioning inner hole, 102-screw hole, 201-positioning excircle, 202-outer ring groove and 401-mounting binding surface.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order that those skilled in the art will better understand the disclosure, the utility model will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 to 4, fig. 1 is a schematic view illustrating an application of a thread biting prevention device for a pile clamping cylinder according to an embodiment of the present invention, fig. 2 is a partially enlarged view of a portion a in fig. 1, fig. 3 is a schematic view illustrating an assembly of an unmodified guide sleeve in the prior art, and fig. 4 is a schematic view illustrating an oblique assembly of the thread biting prevention device for a pile clamping cylinder according to an embodiment of the present invention.
In a first specific embodiment, the pile clamping oil cylinder screw thread biting prevention device provided by the utility model is suitable for assembling the cylinder barrel 10 and the guide sleeve 20, and plays a role in solving the problem that the cylinder barrel 10 and the guide sleeve 20 are easy to have screw thread biting.
The specific structure of the thread biting prevention device for the pile clamping oil cylinder comprises a cylinder barrel 10 and a guide sleeve 20 assembled in the cylinder barrel 10 in a threaded mode, wherein the front portion of the guide sleeve 20 is provided with an external thread matched with the cylinder barrel 10, a positioning gap 12 is formed between the rear portion of the guide sleeve 20 and the cylinder barrel 10, and the positioning gap 12 is located behind the tail end of the external thread.
It should be noted that, the assembly relationship between the cylinder 10 and the guide sleeve 20 in the present embodiment has been described in detail in the prior art, such as a pile clamping cylinder, and the like, and the current screw connection between the cylinder 10 and the guide sleeve 20 has a high wire biting failure rate during assembly and disassembly; the improvement point of the utility model is that the positioning gap 12 between the cylinder barrel 10 and the guide sleeve 20 at the rear part position is greatly helpful for solving the problem of thread biting; for other matters, they are not described in detail herein, and reference is made to the prior art.
In addition, the pile clamping cylinder to which the thread biting prevention device is applied has a structure of the cylinder head 30, the piston rod 40, and the like, and the front end of the guide sleeve 20 is positioned with the mounting contact surface 401 at the piston rod 40 as a positioning reference when the guide sleeve is screwed.
Specifically, the pile clamping oil cylinder is different from the guide sleeve 20 in the thread biting prevention device; in the thread matching of the guide sleeve 20 and the cylinder barrel 10, the guide sleeve 20 is not provided with external threads in the whole length, but the external threads matched with the threads are reserved at the front part, and the external threads are replaced by the positioning gaps 12 at the rear part, namely the tail end; when the guide sleeve is used, local errors exist on the external threads of the front part, accumulated errors of thread pitches depend on screwing length, the accumulated errors can be reflected on the rear part of the guide sleeve 20, the problem that the gap is too small due to the thread matching errors of the front part can be solved through the positioning gap 12, a sufficient space is reserved between the guide sleeve 20 and the cylinder barrel 10, and the problem of wire biting caused by thread screwing interference of the guide sleeve 20 and the cylinder barrel 10 due to the accumulated errors is solved.
It should be noted that there are various ways to realize the positioning gap 12, including but not limited to reducing the size of the cylinder 10 and reducing the size of the guide sleeve 20, and the utility model also falls within the scope of the present embodiment.
Illustratively, in the first implementation of the positioning gap 12, the inner side of the cylinder 10 is provided with a positioning inner hole 101 having a radial dimension larger than that of the external thread, and the positioning gap 12 is located between the positioning inner hole 101 and the guide sleeve 20.
In an exemplary implementation of the second positioning gap 12, the outer side of the guide sleeve 20 is provided with a positioning outer circle 201 having a radial dimension smaller than that of the external thread, and the positioning gap 12 is located between the positioning outer circle 201 and the cylinder 10.
Illustratively, in the third implementation manner of the positioning gap 12, the inner side of the cylinder 10 is provided with a positioning inner hole 101 having a radial dimension larger than that of the external thread, the outer side of the guide sleeve 20 is provided with a positioning outer circle 201 having a radial dimension smaller than that of the external thread, and the positioning gap 12 is located between the positioning inner hole 101 and the positioning outer circle 201.
It should be emphasized that no matter which of the three ways is adopted for realizing the positioning gap 12, the principle is that the thread fit of the thread end is replaced, the fit gap between the cylinder 10 and the tail end of the guide sleeve 20 is increased, and the problems of thread accumulated error caused by machining and too small fit gap between the thread end caused by poor verticality of the guide sleeve 20 and the cylinder head 30 caused by machining can be effectively solved.
In the further description of the principle of the positioning gap 12, it is first explained why the cylinder 10 and the guide sleeve 20 are prone to thread jamming. When the cylinder 10 and the guide sleeve 20 are screwed, the thread surface is partially worn and a thread local error is generated due to some accidental factors during the thread machining. The cumulative error in pitch depends on the twist length. The cumulative error in pitch over the twist length has a large effect on the screwability of the thread. If the internal thread is ideal and the pitch of the external thread is larger than that of the internal thread, the internal thread and the external thread interfere with each other when being screwed under the condition that other parameters are the same, so that the assembly and disassembly of the threads are difficult. The longer the thread is engaged, the greater the cumulative error in pitch. Therefore, the error is often the largest at the matching end of the threaded connection, i.e., the rear part of the guide sleeve 20, and at this time, if the assembly is performed by increasing the tightening torque, the thread is easily deformed by force and worn on the surface, even the thread is broken, and the phenomenon of seizure also occurs during the assembly and disassembly.
As shown in fig. 4, when the perpendicularity between the guide sleeve 20 and the mounting abutting surface 401 is problematic due to machining, the guide sleeve 20 is inclined upward during assembly, so that the clearance between the cylinder 10 and the guide sleeve 20 is too small, and particularly, the clearance is smaller at the end of the thread, which is more likely to cause thread biting. The positioning gap 12 is used for solving the problem, increasing the fit clearance between the cylinder barrel 10 and the tail end of the guide sleeve 20, and effectively solving the problems of thread accumulated error caused by machining and too small fit clearance at the tail end of the thread caused by poor verticality between the guide sleeve 20 and the cylinder head 30 caused by machining, thereby effectively solving the problem of thread biting of the pile clamping oil cylinder.
In addition, when the hydraulic oil cylinder is installed in the whole machine equipment, due to structural limitation, the oil cylinder cannot be provided with a dustproof sleeve, and the working environment of the static pressure pile machine is on the construction site, so that external dust and impurities are more and more easily enter between the threads of the cylinder barrel 10 and the guide sleeve 20, and the wire biting during the disassembly of the oil cylinder is caused. Even if some impurities and dust enter the positioning gap 12, the impurities and the foreign matters can be deposited in the positioning gap 12, so that the impurities and the foreign matters can be prevented from entering the threads and causing thread biting during the thread dismounting.
Besides, the guide sleeve device also comprises a set screw 21 arranged on the cylinder 10, and the set screw 21 is used for locking the guide sleeve 20 after the guide sleeve 20 is assembled.
In this embodiment, the set screw 21 is used to prevent the guide sleeve 20 from being unscrewed along the thread when vibrated by the internal pressure of the cylinder or an external force, and plays a role of fixing.
Specifically, the cylinder tube 10 is provided with a screw hole 102 into which the set screw 21 is fitted, and the guide sleeve 20 is provided with an outer ring groove 202 into which the set screw 21 is fitted.
In the present embodiment, the set screw 21 is fitted and fixed through the screw hole 102, the set screw 21 is inserted from the outside of the cylinder tube 10, and the end portion thereof can be inserted into the outer ring groove 202 on the outer periphery of the guide sleeve 20, thereby achieving the fixing action of the set screw 21 to the guide sleeve 20.
It is noted that, in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.
The thread biting prevention device for the pile clamping oil cylinder provided by the utility model is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (6)
1. The device for preventing threads from biting the threads of the pile clamping oil cylinder comprises a cylinder barrel (10) and a guide sleeve (20) assembled in the cylinder barrel (10) in a threaded mode, and is characterized in that external threads matched with the cylinder barrel (10) are arranged on the front portion of the guide sleeve (20), a positioning gap (12) is formed between the rear portion of the guide sleeve (20) and the cylinder barrel (10), and the positioning gap (12) is located behind the tail end of the external threads.
2. A pile clamping cylinder thread biting prevention device as claimed in claim 1, wherein the inner side of the cylinder barrel (10) is provided with a positioning inner hole (101) having a radial dimension larger than that of the external thread, and the positioning gap (12) is located between the positioning inner hole (101) and the guide sleeve (20).
3. A pile clamping oil cylinder thread biting prevention device as claimed in claim 1, wherein a positioning outer circle (201) having a radial dimension smaller than that of the external thread is provided on an outer side of the guide sleeve (20), and the positioning gap (12) is located between the positioning outer circle (201) and the cylinder barrel (10).
4. The pile clamping oil cylinder thread biting prevention device as claimed in claim 1, wherein a positioning inner hole (101) with a radial dimension larger than that of the external thread is formed in the inner side of the cylinder barrel (10), a positioning outer circle (201) with a radial dimension smaller than that of the external thread is formed in the outer side of the guide sleeve (20), and the positioning gap (12) is located between the positioning inner hole (101) and the positioning outer circle (201).
5. A pile clamping cylinder thread biting prevention device as claimed in any one of claims 1 to 4, further comprising a set screw (21) provided to said cylinder barrel (10), said set screw (21) being adapted to lock said guide sleeve (20) after said guide sleeve (20) has been assembled.
6. A pile clamping cylinder thread biting prevention device as claimed in claim 5, wherein said cylinder barrel (10) is provided with a screw hole (102) for said set screw (21) to fit in, and said guide sleeve (20) is provided with an outer ring groove (202) for said set screw (21) to be caught in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122718564.7U CN216554738U (en) | 2021-11-08 | 2021-11-08 | Thread biting prevention device for pile clamping oil cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122718564.7U CN216554738U (en) | 2021-11-08 | 2021-11-08 | Thread biting prevention device for pile clamping oil cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216554738U true CN216554738U (en) | 2022-05-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122718564.7U Active CN216554738U (en) | 2021-11-08 | 2021-11-08 | Thread biting prevention device for pile clamping oil cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216554738U (en) |
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2021
- 2021-11-08 CN CN202122718564.7U patent/CN216554738U/en active Active
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