CN219703702U - Hydraulic locking type steel cold sawing machine - Google Patents

Abstract

The utility model provides a hydraulic locking type steel cold sawing machine which comprises a rotary driving piece, a saw disc, a locking nut and a chuck, wherein the rotary driving piece is arranged on the saw disc; the outer end of the rotary driving piece is provided with a threaded connecting column; the saw disc is sleeved on the output shaft and provided with a first step and a second step; the locking nut is connected to the threaded connecting column through threads; the chuck is sleeved on the periphery of the first step; the outer end face of the saw disc is connected with a hydraulic locking mechanism, the hydraulic locking mechanism comprises a cylinder body inner sleeve and a cylinder body outer sleeve, a hydraulic cavity can be formed between the cylinder body inner sleeve and the cylinder body outer sleeve, and an oil injection nozzle communicated with the hydraulic cavity is arranged on the cylinder body inner sleeve. According to the hydraulic locking type steel cold sawing machine, the chuck locks the axial position of the saw disc through the hydraulic locking mechanism, so that reliable clamping force is guaranteed to be provided for the saw blade, the locking nut at the outer end of the output shaft further locks the saw disc on the output shaft, the cutting quality of products and the safety of equipment use are improved, and normal operation of production is guaranteed.

Description

Hydraulic locking type steel cold sawing machine

Technical Field

The utility model belongs to the technical field of sawing equipment, and particularly relates to a hydraulic locking type steel cold sawing machine.

Background

In the section steel cold sawing operation, an output shaft of the cold sawing speed reducer is generally a conical shaft, a clamping disc of the sawing machine is provided with a conical hole matched with the conical shaft, and the clamping disc is locked in a mechanical locking mode. Because the output shaft of the cold saw speed reducer can be worn after long-time use, the clamping disc can gradually move to one side close to the speed reducer, the problem of a section steel short ruler occurs in the section steel cutting process, and the cutting quality of products is affected. In addition, because the saw disc can be stressed when the section steel is cut, the risk that the locking component is tripped and the saw blade flies out can be generated, and the production safety accident is easily caused.

Disclosure of Invention

The utility model aims to provide a hydraulic locking type steel cold sawing machine, which can improve the installation reliability of saw blades, ensure the cutting quality of steel and avoid safety accidents.

In order to achieve the above purpose, the utility model adopts the following technical scheme: provided is a hydraulic locking type steel cold sawing machine, comprising:

the rotary driving piece is provided with an output shaft, and the outer end of the output shaft is provided with a threaded connecting column extending outwards;

the saw disc is sleeved on the output shaft and connected with the output shaft through a flat key, and a first step far away from the rotary driving piece and a second step positioned outside the first step are arranged on the peripheral wall of the saw disc;

the locking nut is in threaded connection with the threaded connecting column and is used for abutting against the outer end face of the saw disc to lock the saw disc to the output shaft;

the chuck is sleeved on the periphery of the first step and is used for clamping the saw blade in cooperation with the saw disc;

the outer end face of the saw disc is connected with a hydraulic locking mechanism which is used for being abutted with the outer end face of the chuck to limit the axial position of the chuck, the hydraulic locking mechanism comprises a cylinder body inner sleeve sleeved on the periphery of the second step and a cylinder body outer sleeve sleeved on the periphery of the cylinder body inner sleeve in a sliding mode, a hydraulic cavity can be formed between the cylinder body inner sleeve and the cylinder body outer sleeve, and an oil injection nozzle communicated with the hydraulic cavity is arranged on the outer end face of the cylinder body inner sleeve.

In one possible implementation mode, a limiting table protruding outwards is arranged on the peripheral wall of the cylinder body inner sleeve, a matching table matched with the limiting table is arranged on the cylinder body outer sleeve, the cylinder body inner sleeve is connected to the second step through a second connecting piece, an abutting ring protruding outwards to abut against the outer end face of the chuck is connected to the inner end face of the cylinder body outer sleeve, a pressing cover for limiting sliding displacement of the cylinder body outer sleeve and the cylinder body inner sleeve is connected to the outer end of the cylinder body outer sleeve, a hydraulic cavity is formed between the limiting table and the matching table, and the oil filling nozzle is communicated with the hydraulic cavity.

In some embodiments, the gland is connected to the cylinder jacket through the first connecting piece, the outer end face of the cylinder inner sleeve is provided with a mounting cavity, a rebound piece extending along the axial direction of the cylinder inner sleeve is arranged in the mounting cavity, one end of the rebound piece is abutted to the bottom wall of the mounting cavity, the other end of the rebound piece is abutted to the inner end face of the gland, and the rebound piece is abutted to the gland to drive the cylinder jacket to be away from the chuck.

In some embodiments, the gland is connected with a limiting pin extending into the mounting cavity, and the rebound member is sleeved on the periphery of the limiting pin.

In one possible implementation manner, an embedded groove which is arranged in a concave manner and extends in the circumferential direction is arranged on the inner end face of the cylinder body outer sleeve, the pressing ring is installed in the embedded groove, mutually communicated pressing grooves are arranged on the pressing ring and the inner end face of the cylinder body outer sleeve, and a pressing ring is arranged in the pressing grooves and connected to the cylinder body outer sleeve through a third connecting piece.

In some embodiments, a first sealing ring in sealing fit with the inner peripheral wall of the cylinder outer sleeve is embedded on the outer peripheral wall of the limiting table, and a second sealing ring in sealing fit with the outer peripheral wall of the cylinder inner sleeve is embedded on the inner peripheral wall of the matching table.

In some embodiments, a third seal ring extending circumferentially and in sealing engagement with the outer peripheral wall of the second step is embedded in the inner peripheral wall of the cylinder jacket.

In one possible implementation manner, a positioning pin is arranged between the saw disc and the chuck, a first positioning hole is penetrated through the saw disc, a second positioning hole corresponding to the first positioning hole is arranged on the chuck, and the positioning pin penetrates through the first positioning hole and the second positioning hole.

In some embodiments, the outer end surface of the saw disc is provided with a first limiting cavity communicated with the first positioning hole, the outer end surface of the saw disc is provided with a second limiting cavity communicated with the first positioning hole, the periphery of the positioning pin is provided with a boss in limiting fit with the first limiting cavity, and the outer end of the positioning pin is in threaded connection with a locking nut in abutting fit with the cavity bottom wall of the second limiting cavity.

In one possible implementation manner, the outer end surface of the saw disc is provided with a positioning groove which is arranged in a concave manner and extends circumferentially, and the inner end surface of the chuck is provided with a positioning ring which is matched with the positioning groove in a positioning manner.

Compared with the prior art, the hydraulic locking type steel cold sawing machine provided by the embodiment of the utility model has the advantages that the saw disc is connected to the output shaft through the flat key, the first step of the saw disc is used for installing the chuck, the chuck locks the axial position of the chuck and the saw disc through the hydraulic locking mechanism, the reliable clamping force on the saw blade is ensured, the falling of the saw blade caused by loose locking is avoided, the saw disc is further locked on the output shaft by the locking nut at the outer end of the output shaft, the cutting quality of products and the use safety of equipment are improved, and the normal operation of production is ensured.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a partially cross-sectional structure of a hydraulic locking section steel cold sawing machine according to an embodiment of the present utility model;

FIG. 2 is a schematic view of the enlarged partial structure of FIG. 1 (with the hydraulic locking mechanism omitted) according to an embodiment of the present utility model;

FIG. 3 is a schematic view of a partial enlarged structure of I in FIG. 2 according to an embodiment of the present utility model;

FIG. 4 is an enlarged schematic cross-sectional view of the hydraulic locking mechanism of FIG. 1 in accordance with an embodiment of the present utility model;

FIG. 5 is a right-side view of the structure of FIG. 4 according to the embodiment of the present utility model;

FIG. 6 is a schematic diagram illustrating a left-hand structure of FIG. 4 according to an embodiment of the present utility model;

fig. 7 is a schematic view of a partial enlarged structure in fig. 4 according to an embodiment of the present utility model.

Wherein, each reference sign in the figure:

1. a rotary driving member; 11. an output shaft; 12. a flat key; 13. a threaded connection post; 14. a boss; 15. a lock nut; 2. a saw disc; 21. a first step; 22. a second step; 23. a positioning groove; 24. a first positioning hole; 25. a first spacing cavity; 26. the second limiting cavity; 3. a chuck; 31. a positioning pin; 32. a second positioning hole; 33. a positioning ring; 4. a lock nut; 5. a hydraulic locking mechanism; 51. a cylinder inner sleeve; 511. a limiting table; 512. a second connector; 513. a mounting cavity; 514. a rebound member; 515. a limiting pin; 52. a cylinder jacket; 521. a mating station; 522. a pressing ring; 523. a third connecting member; 53. a gland; 531. a first connector; 54. a pressing ring; 55. an oil filling nozzle; 56. a first seal ring; 57. a second seal ring; 58. a third seal ring; 59. and the valve core is cut off.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or be indirectly on the other element. It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the present utility model. The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a number" is two or more, unless explicitly defined otherwise.

For convenience of description, the outer end surface of the saw disc 2 or the chuck 3 is defined as the end surface on the side away from the rotary driver 1, and the inner end surface of the saw disc 2 or the chuck 3 is defined as the surface on the side close to the rotary driver 1.

Referring to fig. 1 to 7, a cold sawing machine for locking profile steel by using the chuck 3 according to the present utility model will now be described. The chuck 3 locking type steel cold sawing machine comprises a rotary driving piece 1, a saw disc 2, a locking nut 4 and a chuck 3; the rotary driving piece 1 is provided with an output shaft 11, and the outer end of the output shaft 11 is provided with a threaded connecting column 13 extending outwards; the saw disc 2 is sleeved on the output shaft 11, the saw disc 2 is connected with the output shaft 11 through a flat key 12, and a first step 21 far away from the rotary driving piece 1 and a second step 22 positioned outside the first step 21 are arranged on the peripheral wall of the saw disc 2; the lock nut 4 is in threaded connection with the threaded connection column 13 and is used for abutting against the outer end face of the saw disc 2 to lock the saw disc 2 to the output shaft 11; the chuck 3 is sleeved on the periphery of the first step 21 and is used for clamping the saw blade in cooperation with the saw disc 2;

the outer end face of the saw disc 2 is connected with a hydraulic locking mechanism 5 for abutting against the outer end face of the chuck 3 to limit the axial position of the chuck 3, the hydraulic locking mechanism 5 comprises a cylinder inner sleeve 51 sleeved on the periphery of the second step 22 and a cylinder outer sleeve 52 sleeved on the periphery of the cylinder inner sleeve 51 in a sliding manner, a hydraulic cavity can be formed between the cylinder inner sleeve 51 and the cylinder outer sleeve 52, and a grease nipple 55 communicated with the hydraulic cavity is arranged on the outer end face of the cylinder inner sleeve 51.

Compared with the prior art, the chuck 3 locking type steel cold sawing machine provided by the embodiment has the advantages that the chuck 3 locking type steel cold sawing machine is characterized in that the saw disc 2 is connected to the output shaft 11 through the flat key 12, the first step 21 of the saw disc 2 is used for installing the chuck 3, the chuck 3 is locked with the saw disc 2 in axial position through the hydraulic locking mechanism 5, reliable clamping force is guaranteed to be provided for a saw blade, the saw blade is prevented from falling due to infirm locking, the saw disc 2 is further locked on the output shaft 11 by the locking nut 4 at the outer end of the output shaft 11, the cutting quality of products and the safety of equipment use are improved, and normal operation of production is guaranteed.

In this embodiment, a hydraulic cavity can be formed between the cylinder inner sleeve 51 and the cylinder outer sleeve 52 of the hydraulic locking mechanism 5, and working medium hydraulic oil is injected into the hydraulic pressure chamber through the oil injection nozzle 55, so that a certain pressure is maintained, and the pressing effect of the cylinder outer sleeve 52 on the outer end surface of the chuck 3 is further ensured.

Specifically, the working pressure of the hydraulic locking mechanism 5 is 320bar, the cylinder jacket 52 forms a pressing force on the outer end face of the chuck 3 through pressing the hydraulic locking mechanism, so that the chuck 3 and the saw disc 2 effectively clamp the saw blade, and then the locking nut 4 is used for locking the chuck 3 and the saw disc 2 secondarily, so that the reliability of saw blade installation is ensured, and the falling phenomenon caused by loose locking is avoided.

On the basis, a stop valve core 59 communicated with the hydraulic cavity is arranged on the cylinder jacket 52, the stop valve core 59 is mainly used for controlling the circulation and stop of oil, the stop valve core 59 is in a hydraulic balance type, the opening force is small, and the sealing performance is reliable.

In one possible implementation, the above-described characteristic cylinder liner 51 and cylinder jacket 52 may take the configuration shown in fig. 4 and 7. Referring to fig. 4 and 7, a limiting table 511 protruding outwards is provided on the outer peripheral wall of the cylinder inner sleeve 51, a matching table 521 matching with the limiting table 511 is provided on the cylinder outer sleeve 52, the cylinder inner sleeve 51 is connected to the second step 22 through a second connecting piece 512, a pressing ring 54 protruding outwards to abut against the outer end surface of the chuck 3 is connected to the inner end surface of the cylinder outer sleeve 52, a pressing cover 53 for limiting sliding displacement of the cylinder outer sleeve 52 and the cylinder inner sleeve 51 is connected to the outer end of the cylinder outer sleeve 52, a hydraulic cavity is formed between the limiting table 511 and the matching table 521, and an oil filling nozzle 55 is communicated with the hydraulic cavity.

In this embodiment, a hydraulic chamber is formed between the limit table 511 and the mating table 521 between the cylinder outer sleeve 52 and the cylinder inner sleeve 51, and when the oil injection nozzle 55 is injected with oil and pressed, the pressure in the hydraulic chamber increases, and on the basis that the cylinder inner sleeve 51 is reliably connected with the outer end face of the saw disc 2 (i.e., the outer end face of the second step 22), the cylinder outer sleeve 52 moves to the side close to the chuck 3 so as to abut against the outer end face of the chuck 3, thereby realizing reliable locking of the chuck 3 and the saw disc 2.

In some embodiments, referring to fig. 4 and 7, the gland 53 is connected to the cylinder outer sleeve 52 by a first connecting member 531, a mounting cavity 513 is provided on an outer end surface of the cylinder inner sleeve 51, a rebound member 514 extending along an axial direction of the cylinder inner sleeve 51 is provided in the mounting cavity 513, one end of the rebound member 514 abuts against a bottom wall of the mounting cavity 513, the other end abuts against an inner end surface of the gland 53, and the rebound member 514 is used for abutting against the gland 53 to drive the cylinder outer sleeve 52 away from the chuck 3.

In this embodiment, the gland 53 is connected to the cylinder outer sleeve 52 by the first connector 531, the inner peripheral edge of the gland 53 extends to the axis to cover and partially cover the outer side of the cylinder inner sleeve 51, and a rebound member 514 capable of pressing against the inner end surface of the gland 53 is disposed in the mounting cavity 513 on the outer end surface of the cylinder inner sleeve 51. After the pressure is removed from the hydraulic chamber, the rebound member 514 is capable of pushing the cylinder jacket 52 to move to a side away from the chuck 3, releasing the chuck 3, and facilitating replacement of the saw blade during maintenance.

In some embodiments, the feature gland 53 may be configured as shown in fig. 4 to 7. Referring to fig. 4 to 7, a stopper pin 515 extending into the mounting chamber 513 is connected to the pressing cover 53, and a rebound member 514 is sleeved on the outer circumference of the stopper pin 515. The rebound member 514 is a compression spring, the limiting pin 515 is arranged along the axial direction of the gland 53 and penetrates through the center of the rebound member 514, so that the axial position of the rebound member 514 can be limited, and the rebound member 514 is prevented from being bent, and the elastic resetting effect of the rebound member is prevented from being influenced.

In one possible implementation, the above-described feature cylinder jacket 52 may take the configuration shown in fig. 4-7. Referring to fig. 4 to 7, an embedded groove which is concavely arranged and extends circumferentially is arranged on the inner end surface of the cylinder jacket 52, the pressing ring 54 is installed in the embedded groove, pressing grooves which are mutually communicated are arranged on the pressing ring 54 and the inner end surface of the cylinder jacket 52, a pressing ring 522 is arranged in the pressing groove, and the pressing ring 522 is connected to the cylinder jacket 52 through a third connecting piece 523.

In this embodiment, the end of the cylinder jacket 52 near the chuck 3 is provided with the pressing ring 522, and the pressing ring 522 protrudes from the outer peripheral wall of the cylinder jacket 52 in the outer peripheral direction, so that the contact area with the outer end surface of the chuck 3 can be increased, and the pressing action on the chuck 3 in the pressing state can be enhanced.

On this basis, the pressing ring 54 is limited on the inner end face of the cylinder jacket 52 through the pressing of the pressing ring 522, the pressing groove is located on the inner end face of the adjacent part of the pressing ring 54 and the cylinder jacket 52 and used for accommodating the pressing ring 522, a countersunk hole is formed in the pressing ring 522 and used for installing a countersunk screw, and the pressing ring 522 is connected on the inner end face of the cylinder jacket 52 through the countersunk screw, so that the fixing effect of the pressing ring 54 is realized.

In some embodiments, the feature-limiting stage 511 and the mating stage 521 may be configured as shown in fig. 7. Referring to fig. 7, a first seal ring 56 is fitted on the outer peripheral wall of the stopper 511 to be in sealing engagement with the inner peripheral wall of the cylinder jacket 52, and a second seal ring 57 is fitted on the inner peripheral wall of the engagement table 521 to be in sealing engagement with the outer peripheral wall of the cylinder inner jacket 51.

In this embodiment, the sealing performance in the hydraulic cavity is ensured by the first sealing ring 56 and the second sealing ring 57, so that the hydraulic cavity can maintain a certain pressure value in the pressing state, and further, the pressing ring 54 at the inner end of the cylinder jacket 52 can press and tightly press the chuck 3.

On the basis, referring to fig. 7, a third seal ring 58 extending circumferentially and being in sealing engagement with the outer peripheral wall of the second step 22 is fitted on the inner peripheral wall of the cylinder jacket 52. The third seal ring 58 provides a good seal between the inner peripheral wall of the cylinder jacket 52 and the outer peripheral wall of the second step 22, improving the tightness of the inside of the structure and improving the safety of the equipment.

In one possible implementation, the above-described feature saw disc 2 and chuck 3 may take the configuration shown in fig. 1-3. Referring to fig. 1 to 3, a positioning pin 31 is arranged between the saw disc 2 and the chuck 3, a first positioning hole 24 is penetrated and arranged on the saw disc 2, a second positioning hole 32 which is arranged corresponding to the first positioning hole 24 is arranged on the chuck 3, and the positioning pin 31 penetrates and is arranged in the first positioning hole 24 and the second positioning hole 32.

In this embodiment, the first positioning hole 24 and the second positioning hole 32 enable the saw disc 2 and the chuck 3 to be precisely positioned through the positioning pin 31, so that the axial positions of the saw disc 2, the saw blade and the chuck 3 are effectively aligned, and the position accuracy of saw blade installation is improved.

In some embodiments, the above-described feature saw disc 2 and the positioning pin 31 may take the structure shown in fig. 3. Referring to fig. 3, a first limiting cavity 25 communicated with a first positioning hole 24 is formed in the outer end face of the saw disc 2, a second limiting cavity 26 communicated with the first positioning hole 24 is formed in the outer end face of the saw disc 2, a boss 14 in limiting fit with the first limiting cavity 25 is arranged on the periphery of a positioning pin 31, and a locking nut 15 in abutting fit with the cavity bottom wall of the second limiting cavity 26 is connected with the outer end of the positioning pin 31 in a threaded mode.

In this embodiment, the first limiting cavity 25 on the outer end surface of the saw disc 2 can form a limiting effect with the boss 14 of the positioning pin 31, and the positioning pin 31 is reliably fixed on the saw disc 2 by combining with the arrangement of the locking nut 15 at the other end of the positioning pin 31, so that the positioning pin 31 has a good positioning effect. In particular, the second spacing cavity 26 on the inner end surface of the saw disc 2 provides space for the installation of the lock nut 15.

In one possible implementation, the above-described feature saw disc 2 may take the configuration shown in fig. 2. Referring to fig. 2, the outer end surface of the saw disc 2 is provided with a positioning groove 23 which is concavely arranged and extends circumferentially, and the inner end surface of the chuck 3 is provided with a positioning ring 33 which is matched with the positioning groove 23 in a positioning way.

In this embodiment, the positioning groove 23 on the saw disc 2 can be reliably positioned with the positioning ring 33 on the chuck 3, so that the axes of the positioning groove and the positioning ring coincide, the chuck 3 is prevented from position dislocation relative to the saw disc 2, the accurate installation of the saw blade is realized, and the cutting quality of the section steel is further ensured.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.

Claims (10)

1. Hydraulic locking shaped steel cold sawing machine, its characterized in that includes:

the rotary driving piece is provided with an output shaft, and the outer end of the output shaft is provided with a threaded connecting column extending outwards;

the saw disc is sleeved on the output shaft and connected with the output shaft through a flat key, and a first step far away from the rotary driving piece and a second step positioned outside the first step are arranged on the peripheral wall of the saw disc;

the locking nut is in threaded connection with the threaded connection column and is used for abutting against the outer end face of the saw disc to lock the saw disc to the output shaft;

the chuck is sleeved on the periphery of the first step and is used for clamping the saw blade in cooperation with the saw disc;

the saw disc is characterized in that a hydraulic locking mechanism used for being abutted with the outer end face of the chuck to limit the axial position of the chuck is connected to the outer end face of the saw disc, the hydraulic locking mechanism comprises a cylinder body inner sleeve sleeved on the periphery of the second step and a cylinder body outer sleeve sleeved on the periphery of the cylinder body inner sleeve in a sliding mode, a hydraulic cavity can be formed between the cylinder body inner sleeve and the cylinder body outer sleeve, and an oil injection nozzle communicated with the hydraulic cavity is arranged on the outer end face of the cylinder body inner sleeve.

2. The hydraulic locking type steel cold sawing machine as claimed in claim 1, wherein a limiting table protruding outwards is arranged on the peripheral wall of the cylinder body inner sleeve, a matching table matched with the limiting table is arranged on the cylinder body outer sleeve, the cylinder body inner sleeve is connected to the second step through a second connecting piece, a pressing ring protruding outwards to be abutted to the outer end face of the chuck is connected to the inner end face of the cylinder body outer sleeve, a pressing cover for limiting sliding displacement of the cylinder body outer sleeve and the cylinder body inner sleeve is connected to the outer end of the cylinder body outer sleeve, a hydraulic cavity is formed between the limiting table and the matching table, and the oil injection nozzle is communicated with the hydraulic cavity.

3. The hydraulic locking type steel cold sawing machine as claimed in claim 2, wherein the gland is connected to the cylinder body outer sleeve through a first connecting piece, a mounting cavity is formed in the outer end face of the cylinder body inner sleeve, a rebound piece extending along the axial direction of the cylinder body inner sleeve is arranged in the mounting cavity, one end of the rebound piece is abutted to the bottom wall of the mounting cavity, the other end of the rebound piece is abutted to the inner end face of the gland, and the rebound piece is abutted to the gland to drive the cylinder body outer sleeve to be far away from the chuck.

4. A hydraulic locking section steel cold sawing machine as claimed in claim 3, wherein the gland is connected with a limiting pin extending into the mounting cavity, and the rebound member is sleeved on the periphery of the limiting pin.

5. The hydraulic locking type steel cold sawing machine as claimed in claim 2, wherein an embedded groove which is arranged in a concave manner and extends in the circumferential direction is formed in the inner end face of the cylinder body outer sleeve, the pressing ring is installed in the embedded groove, mutually communicated pressing grooves are formed in the pressing ring and the inner end face of the cylinder body outer sleeve, a pressing ring is arranged in the pressing groove, and the pressing ring is connected to the cylinder body outer sleeve through a third connecting piece.

6. The hydraulic locking type steel cold sawing machine as claimed in claim 5, wherein a first sealing ring which is in sealing fit with the inner peripheral wall of the cylinder body outer sleeve is embedded on the outer peripheral wall of the limiting table, and a second sealing ring which is in sealing fit with the outer peripheral wall of the cylinder body inner sleeve is embedded on the inner peripheral wall of the matching table.

7. The hydraulic lock section steel cold sawing machine as claimed in claim 6, wherein a third sealing ring which extends circumferentially and is in sealing fit with the outer peripheral wall of the second step is embedded on the inner peripheral wall of the cylinder jacket.

8. The hydraulic locking type steel cold sawing machine according to any one of claims 1 to 7 wherein a positioning pin is arranged between the saw disc and the chuck, a first positioning hole is formed in the saw disc in a penetrating manner, a second positioning hole corresponding to the first positioning hole is formed in the chuck, and the positioning pin penetrates through the first positioning hole and the second positioning hole.

9. The hydraulic locking type steel cold sawing machine as claimed in claim 8, wherein a first limiting cavity communicated with the first positioning hole is formed in the outer end face of the saw disc, a second limiting cavity communicated with the first positioning hole is formed in the outer end face of the saw disc, a boss in limiting fit with the first limiting cavity is arranged on the periphery of the positioning pin, and a locking nut in abutting fit with the cavity bottom wall of the second limiting cavity is connected with the outer end thread of the positioning pin.

10. The hydraulic locking type steel cold sawing machine as claimed in any one of claims 1 to 7, wherein a positioning groove which is arranged in a concave manner and extends in the circumferential direction is arranged on the outer end face of the saw disc, and a positioning ring which is matched with the positioning groove in a positioning manner is arranged on the inner end face of the chuck.