CN111872314A - Gantry type heavy expanding and forging machine set - Google Patents
Gantry type heavy expanding and forging machine set Download PDFInfo
- Publication number
- CN111872314A CN111872314A CN202010759363.9A CN202010759363A CN111872314A CN 111872314 A CN111872314 A CN 111872314A CN 202010759363 A CN202010759363 A CN 202010759363A CN 111872314 A CN111872314 A CN 111872314A
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- driven shaft
- driving shaft
- gantry
- oil cylinder
- bearing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/76—Making machine elements elements not mentioned in one of the preceding groups
- B21K1/761—Making machine elements elements not mentioned in one of the preceding groups rings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J9/00—Forging presses
- B21J9/10—Drives for forging presses
- B21J9/12—Drives for forging presses operated by hydraulic or liquid pressure
- B21J9/14—Drives for forging presses operated by hydraulic or liquid pressure in conjunction with electric power
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J9/00—Forging presses
- B21J9/10—Drives for forging presses
- B21J9/18—Drives for forging presses operated by making use of gearing mechanisms, e.g. levers, spindles, crankshafts, eccentrics, toggle-levers, rack bars
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
The invention discloses a gantry type heavy expanding forging machine set, which comprises a machine body, a main oil cylinder on the machine body, a driving shaft assembly, a driven shaft assembly, a power output mechanism, a gantry, a turnover supporting arm and a hydraulic servo mechanism, wherein the driven shaft assembly and the driving shaft assembly are arranged on a movable rack of the machine body and the main oil cylinder through a limiting mechanism; an auxiliary oil cylinder is arranged on the portal frame, and a supporting mechanism is arranged on the auxiliary oil cylinder and used for disassembling or assembling the die; the turnover supporting arm is used for disassembling or assembling a workpiece; the hydraulic servo mechanism controls the main oil cylinder and the auxiliary oil cylinder to synchronously drive the driving shaft assembly to move, so that the die on the driving shaft assembly performs roll forging on a workpiece; the invention has the beneficial effects that: the scheme adopts the turnable portal frame to realize the processing of annular parts with the height of more than 500mm, and can completely replace a vertical expanding and forging machine set or a horizontal expanding and forging machine set with high price which can meet the processing requirements, and the portal frame has the advantages of lower price, fewer additional mechanisms of equipment and lower cost.
Description
Technical Field
The invention relates to metal forming equipment, in particular to a gantry type heavy expanding forging machine set.
Background
The continuous advance of the industrial age has appeared various metal processing technology, the demand for annular parts is increased sharply, and the requirements for precision and size are higher and higher, in the past, these annular parts have typically been forged, swaged or swaged on a press or hammer, for the requirement of processing large size of annular parts, a horizontal expanding and forging machine set is generally adopted to process the annular parts under the conditions of ensuring that the metal performance of the processed parts meets the requirement, continuously increasing the production capacity and improving the efficiency, for the traditional vertical expanding and forging machine, only a circular ring with the height of less than 500mm can be processed, but the vertical expanding and forging machine with the height of more than 500mm can be processed, the equipment is expensive, the price of the horizontal expanding forging machine set which can be processed is too high, and a vertical expanding forging machine set which has lower cost and can process larger size is needed.
Disclosure of Invention
The invention aims to provide a gantry type heavy-duty expanding forging unit to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a heavy expanding of planer-type forges unit, includes master cylinder, drive shaft subassembly, driven shaft subassembly, power take off mechanism and hydraulic servo on organism, the organism, and the drive shaft subassembly passes through stop gear to be installed in the activity frame of master cylinder, and the driven shaft subassembly passes through stop gear to be installed on the organism, still includes:
the gantry is hinged to a mounting surface at the front end of the driving shaft assembly, an auxiliary oil cylinder is mounted on the gantry, a supporting mechanism is mounted on the auxiliary oil cylinder, and the supporting mechanism is used for disassembling or assembling a mold;
the overturning supporting arm is used for disassembling or assembling a workpiece; the hydraulic servo mechanism controls the main oil cylinder and the auxiliary oil cylinder to synchronously drive the driving shaft assembly to move towards or away from the driven shaft assembly, so that the workpiece is roll forged by the die, and the power output mechanism provides power for the driving shaft assembly.
As a further scheme of the invention: the machine body is provided with a turnover oil cylinder for turning over the portal frame, and the turnover oil cylinder pushes the portal frame to realize the disassembly or the assembly of the die.
As a further scheme of the invention: the overturning supporting arm comprises a driven shaft supporting frame and a driven shaft overturning oil cylinder, the driven shaft supporting frame is hinged to a front end mounting surface of the driven shaft, and the driven shaft overturning oil cylinder is used for changing the posture of the driven shaft supporting frame and clamping a workpiece on the driven shaft.
As a further scheme of the invention: the gantry turnover device is characterized by further comprising a limiting support frame, wherein the limiting support frame is arranged on one side, far away from the machine body, of the gantry and is used for limiting and supporting the overturned gantry.
As a further scheme of the invention: the limiting mechanism comprises a thrust bearing, a driving shaft sleeve, a driven shaft sleeve, a bearing cover and a bolt, wherein a driving shaft of the driving shaft assembly is installed in a bearing hole formed in the movable frame through the thrust bearing, the driving shaft sleeve, the bearing cover and the bolt, one end of the driving shaft is connected with the power output mechanism, the other end of the driving shaft is limited and supported by the supporting mechanism, and a driven shaft of the driven shaft assembly is installed on the machine body through the thrust bearing, the driven shaft sleeve, the bearing cover and the bolt.
As a further scheme of the invention: the supporting mechanism further comprises a conical outer sleeve, the conical outer sleeve is respectively installed at one end of the driving shaft and one end of the driven shaft and respectively used for returning and guiding the portal frame and the overturning supporting arm.
As a further scheme of the invention: the supporting mechanism is provided with a bearing and a first sliding shaft sleeve, and the inner surface of the first sliding shaft sleeve is provided with a taper for guiding a taper outer sleeve on the driving shaft and limiting the bearing on the driving shaft.
As a further scheme of the invention: the driven shaft assembly comprises a driven shaft, a bearing and a second sliding shaft sleeve, the second sliding shaft sleeve is installed on the driven shaft support frame, and the inner surface of the second sliding shaft sleeve is provided with a taper for guiding the taper outer sleeve on the driven shaft and limiting the bearing on the driven shaft.
As a still further scheme of the invention: the power output mechanism comprises a speed reducer and a universal coupling, and the speed reducer is connected with the driving shaft through the universal coupling.
Compared with the prior art, the invention has the beneficial effects that: the scheme adopts a traditional vertical expanding and forging machine, and the turnover portal frame and the turnover support arm are added, so that the supporting of one end of the driving shaft and one end of the driven shaft are changed into detachable limiting supporting, the available lengths of the driving shaft and the driven shaft are increased, the clamping of a die and a workpiece is facilitated, the processing of annular parts with the height of more than 500mm is realized, a vertical expanding and forging machine set or a horizontal expanding and forging machine set with high price which can meet the processing requirements can be completely replaced, the price is cheaper than that, the number of additional mechanisms of the equipment is small, and the cost is lower.
Drawings
Fig. 1 is a schematic structural diagram of a gantry type heavy-duty expanding forging unit.
Fig. 2 is a schematic structural diagram of a main drive shaft assembly in a gantry type heavy-duty expanding forging machine set.
Fig. 3 is a right side view of a gantry type heavy-duty expanding forging machine set.
Fig. 4 is a partial structural schematic diagram of a gantry type heavy-duty expanding forging unit.
Fig. 5 is a schematic top view of a gantry type heavy-duty expanding forging machine set.
Fig. 6 is a partial sectional view of a gantry type heavy-duty expanding forging machine set.
In the drawings: 1-portal frame, 2-power output mechanism, 201-speed reducer, 202-universal coupling, 203-master cylinder, 204-slave cylinder, 205-support mechanism, 3-drive shaft, 301-drive shaft shoulder, 302-first special-shaped sliding shaft sleeve, 4-driven shaft, 401-driven shaft shoulder, 402-second special-shaped sliding shaft sleeve, 5-turnover mechanism, 501-turnover cylinder, 502-driven shaft turnover cylinder, 503-driven shaft support frame, 6-limit mechanism, 601-thrust bearing, 602-bolt, 603-conical outer sleeve, 604-bearing cover, 605-baffle, 606-bearing sleeve, 7-limit support frame, 8-engine body and 9-hydraulic servo mechanism.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
Referring to fig. 1-5, in an embodiment of the present invention, a gantry type heavy expanding forging machine set includes a machine body 8, a main oil cylinder 203 on the machine body 8, a driving shaft assembly, a driven shaft assembly, a power output mechanism 2, and a hydraulic servo mechanism 9, where the driving shaft assembly is installed on a movable frame of the main oil cylinder 203 through a limiting mechanism 6, and the driven shaft assembly is installed on the machine body 8 through the limiting mechanism 6, and further includes:
the device comprises a portal frame 1, wherein the portal frame 1 is hinged to a mounting surface at the front end of a driving shaft assembly, an auxiliary oil cylinder 204 is mounted on the portal frame 1, a supporting mechanism 205 is mounted on the auxiliary oil cylinder 204, and the supporting mechanism 205 is used for disassembling or assembling a mold;
the overturning supporting arm is used for disassembling or assembling a workpiece; the hydraulic servo mechanism 9 controls the main oil cylinder 203 and the auxiliary oil cylinder 204 to synchronously drive the driving shaft assembly to move towards or away from the driven shaft assembly, so that the die on the driving shaft assembly performs roll forging on a workpiece on the driven shaft assembly, and the power output mechanism 2 provides power for the driving shaft assembly.
Specifically, the driven shaft assembly at one end of the driven shaft 4 is disassembled by turning the supporting arm, so that a workpiece is clamped on the driven shaft 4 from the disassembling end, and then the driven shaft assembly is installed on the driven shaft 4 by turning the supporting arm, so that the assembly of the driven shaft 4 is completed; the installation parts at one ends of the driving shaft assembly and the driven shaft assembly are respectively changed into the turnable portal frame 1 and the turnable supporting arm, and the detachable installation parts are convenient for clamping a mold and a workpiece, increase the clamping space and can process annular parts with larger sizes.
Referring to fig. 1 and 4, in the embodiment of the present invention, an overturning oil cylinder 501 for overturning the gantry 1 is installed on the machine body 8, and the overturning oil cylinder 501 pushes the gantry 1 to detach or install the mold, so that the mold is clamped on the driving shaft 3 of the driving shaft assembly.
Specifically, upset hydro-cylinder 501 work makes portal frame 1 dismantle the driving shaft subassembly of driving shaft 3 one end, and the mould of being convenient for is held the clamping on driving shaft 3 from dismantling, and later, portal frame 1 resets, installs driving shaft 3 with the driving shaft subassembly, accomplishes the assembly of mould.
Referring to fig. 1 and 3, in the embodiment of the present invention, the overturning support arm includes a driven shaft support frame 503 and a driven shaft overturning oil cylinder 502, the driven shaft support frame 503 is hinged to the front end mounting surface of the driven shaft 4, and the driven shaft overturning oil cylinder 502 is used for changing the posture of the driven shaft support frame 503 to clamp the workpiece on the driven shaft 4.
Specifically, the driven shaft overturning cylinder 502 moves the driven shaft support frame 503 away from one end of the driven shaft 4, and is in a horizontal state, and clamps the heated workpiece on the driven shaft 4, and then the shaft overturning cylinder 502 resets the driven shaft support frame 503, and the driven shaft assembly arranged on the driven shaft support frame 503 carries out limit support on the driven shaft 4.
Referring to fig. 4, in the embodiment of the present invention, the present invention further includes a limiting support frame 7, where the limiting support frame 7 is installed on a side of the gantry 1 far away from the machine body 8, and is used for limiting and supporting the flipped gantry 1.
Specifically, when the overturning oil cylinder 501 pushes the portal frame 1 to the limiting support frame 7, the limiting support frame 7 carries out limiting support on the portal frame 1, so that the displacement of the portal frame 1 is restrained, and the load of the overturning oil cylinder 501 is reduced.
Referring to fig. 1 and 2, in the embodiment of the present invention, the limiting mechanism includes a thrust bearing 601, a driving shaft sleeve, a driven shaft sleeve, a bearing cap 604 and a bolt 602, a driving shaft 3 of the driving shaft assembly is installed in a bearing hole of the movable frame through the thrust bearing 601, the driving shaft sleeve, the bearing cap 604 and the bolt 602, the bearing cap 604 is installed on one side of the movable frame close to the gantry 1 by the bolt 602, and abuts against the driving shaft shoulder, while one group of thrust bearings 601 is axially limited, the thrust bearing 601 is abutted against by the driving shaft sleeve, the driving shaft sleeve is abutted against by the other group of thrust bearings 601, and the other group of thrust bearings 601 is installed and fixed by the bearing cap 604 and the bolt 602; to this end, the driving shaft is axially fixed, and the two sets of thrust bearings 601 are constrained in bearing holes of the movable frame; one end of the driving shaft 3 is connected with the power output mechanism 2, the other end of the driving shaft is limited and supported by the supporting mechanism 205, and the driven shaft 4 of the driven shaft assembly is installed on the machine body 8 through the thrust bearing 601, the driven shaft sleeve, the bearing cover 604 and the bolt 602.
Preferably, the limiting mechanism 6 includes a thrust bearing 601, a bolt 602, a bearing cap 604, a baffle 605 and a bearing sleeve 606, the driving shaft 3 of the driving shaft assembly is mounted on the movable frame through the thrust bearing 601, the bolt 602, the driving shaft sleeve, the bearing cap 604, the baffle 605 and the bearing sleeve 606, one end of the driving shaft 3 is connected with the power output mechanism 2, the other end of the driving shaft 3 is limited and supported by the supporting mechanism 205, and the driven shaft 4 of the driven shaft assembly is mounted on the machine body 8 through the thrust bearing 601, the bolt 602, the driven shaft sleeve, the bearing cap 604, the baffle 605 and the bearing sleeve 606.
Optionally, the installation is performed by using the above installation method, and the baffle 605 is installed on one side of the thrust bearing 601 to constrain the thrust bearing 601 in the radial direction and the axial direction.
Preferably, the limiting mechanism 6 comprises a thrust bearing 601, a shaft shoulder is arranged in the middle of the driving shaft 3, one group of thrust bearings 601 is mounted on the shaft shoulder and fixed on the movable rack by a bearing cover and a bolt, the shaft shoulder is abutted by a bearing and a driving shaft sleeve, the other end of the driving shaft sleeve is abutted by the other group of thrust bearings 601 and fixed on the movable rack by the bearing cover and the bolt, and because the thrust bearings 601 can bear axial pressure generated when the driving shaft rotates, the thrust bearings 601 limit deviation of the driving shaft within a certain range and limit play of the driving shaft; an angular contact ball bearing is selected to replace the thrust bearing 601, the inner ring and the outer ring of the angular contact ball bearing are both provided with roller paths, and the inner ring and the outer ring can perform relative displacement along the axial direction of the bearing; the bearing is particularly suitable for bearing composite load, namely the load which acts in the radial direction and the axial direction simultaneously. The axial load bearing capacity of the angular contact ball bearing is increased along with the increase of a contact angle, the contact angle is an angle between a contact point connecting line of a ball and a raceway in a radial plane and a vertical line of a bearing axis, and the play of a driving shaft is better limited.
Referring to fig. 1 and 2, in the embodiment of the present invention, the supporting mechanism 205 further includes a conical outer sleeve 603, and the conical outer sleeve 603 is respectively installed at one end of the driving shaft 3 and one end of the driven shaft 4, and respectively guides the returning of the gantry 1 and the overturning supporting arm;
specifically, a driving shaft assembly and a driven shaft assembly which are arranged on the portal frame 1 and the overturning supporting arm are matched, so that the portal frame 1 and the overturning supporting arm can smoothly screw in and out from the driving shaft 3 and the driven shaft 4 respectively and accurately position; the conical outer sleeve 603 is arranged at one end of the driving shaft 3 and the driven shaft 4 close to the portal frame.
Referring to fig. 2, 3 and 6, in the embodiment of the present invention, the bearing and the first sliding shaft sleeve 302 are installed on the supporting mechanism 205, and the inner surface of the first sliding shaft sleeve 302 is provided with a taper for guiding the tapered outer sleeve 603 on the driving shaft 3 and for limiting the bearing on the driving shaft 3.
Specifically, the type of the bearing is 352956, and the taper is arranged on the inner surface of the first sliding shaft sleeve 302, so that the taper outer sleeve 603 is more accurate in screwing in and screwing out, and the centrality of the driving shaft 3 is ensured to meet the set requirement;
referring to fig. 1 and 6, in the embodiment of the present invention, the driven shaft assembly includes a driven shaft 4, a bearing and a second sliding shaft sleeve 402, the bearing is installed on the driven shaft 4, the second sliding shaft sleeve 402 is installed on a supporting frame 503 of the driven shaft, and an inner surface of the second sliding shaft sleeve 402 is provided with a taper for guiding a tapered outer sleeve 603 on the driven shaft 4 and for limiting the bearing on the driven shaft 4.
Specifically, the bearing is arranged on the driven shaft 4 and bears radial pressure generated when the driven shaft 4 works; the taper arranged on the inner surface of the second sliding shaft sleeve 402 enables the taper outer sleeve 603 to be more accurate in screwing in and screwing out, and ensures that the centrality of the driven shaft 4 meets the set requirement.
Referring to fig. 1, in the embodiment of the present invention, the power output mechanism 2 includes a speed reducer 201 and a universal joint 202, and the speed reducer 201 is connected to the driving shaft 3 through the universal joint 202.
Specifically, through the adjustment of the universal coupling 202, when the driving shaft 3 moves to the driven shaft 4 passively, the power of the speed reducer 201 is transmitted to the driving shaft 3, so that the driving shaft 3 drives the mold to process the workpiece on the driven shaft 4.
The working principle of the invention is as follows: firstly, switching on a power supply and starting a hydraulic servo mechanism, and then pushing a portal frame to a limiting support frame through a turnover oil cylinder; then, the mold is arranged on the driving shaft and fixed at the place where the portal frame is moved away, and the overturning oil cylinder is started to reset the portal frame; starting a driven shaft supporting oil cylinder to enable a driven shaft supporting frame to turn over to a horizontal position, placing the heated cylindrical workpiece on a driven shaft, and resetting the driven shaft supporting frame; the starting motor drives the speed reducer and the universal coupling to rotate, the universal coupling drives the driving shaft to rotate, the main oil cylinder and the auxiliary oil cylinder are started to synchronously and rapidly feed towards the direction of the driven shaft, and the feeding speed is reduced to a specified speed until the workpiece is machined.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (9)
1. The utility model provides a heavy expanding of planer-type forges unit, includes master cylinder, drive shaft subassembly, driven shaft subassembly, power take off mechanism and hydraulic servo on organism, the organism, and the drive shaft subassembly passes through stop gear to be installed in the activity frame of master cylinder, and the driven shaft subassembly passes through stop gear to be installed on the organism, and its characterized in that still includes:
the gantry is hinged to a mounting surface at the front end of the driving shaft assembly, an auxiliary oil cylinder is mounted on the gantry, a supporting mechanism is mounted on the auxiliary oil cylinder, and the supporting mechanism is used for disassembling or assembling a mold;
the overturning supporting arm is used for disassembling or assembling a workpiece; the hydraulic servo mechanism controls the main oil cylinder and the auxiliary oil cylinder to synchronously drive the driving shaft assembly to move towards or away from the driven shaft assembly, so that the workpiece is roll forged by the die, and the power output mechanism provides power for the driving shaft assembly.
2. The gantry type heavy expanding forging machine set according to claim 1, wherein a turnover cylinder for turning over the gantry is mounted on the machine body, and the turnover cylinder pushes the gantry to detach or mount the die.
3. The gantry type heavy expanding forging machine set as claimed in claim 1, wherein the overturning supporting arm comprises a driven shaft supporting frame and a driven shaft overturning oil cylinder, the driven shaft supporting frame is mounted on the front end mounting surface of the driven shaft in an articulated mode, and the driven shaft overturning oil cylinder is used for changing the posture of the driven shaft supporting frame to clamp a workpiece on the driven shaft.
4. The gantry type heavy expanding forging machine set according to claim 1, further comprising a limiting support frame, wherein the limiting support frame is installed on one side, away from the machine body, of the gantry frame and is used for limiting and supporting the inverted gantry frame.
5. The gantry heavy-duty expanding forging unit according to claim 1, wherein the limiting mechanism comprises a thrust bearing, a driving shaft sleeve, a driven shaft sleeve, a bearing cover and a bolt, a driving shaft of the driving shaft assembly is mounted in a bearing hole formed in the movable frame through the thrust bearing, the driving shaft sleeve, the bearing cover and the bolt, one end of the driving shaft is connected with the power output mechanism, the other end of the driving shaft is limited and supported by the supporting mechanism, and a driven shaft of the driven shaft assembly is mounted on the movable frame through the thrust bearing, the driven shaft sleeve, the bearing cover and the bolt.
6. The gantry type heavy expanding forging machine set as claimed in claim 5, wherein the supporting mechanism further comprises a conical outer sleeve, the conical outer sleeve is respectively mounted at one end of the driving shaft and one end of the driven shaft and respectively guides the returning of the gantry and the overturning supporting arm.
7. The gantry type heavy-duty expanding forging unit according to claim 6, wherein the support mechanism is provided with a bearing and a first sliding shaft sleeve, and the inner surface of the first sliding shaft sleeve is provided with a taper for guiding a tapered sleeve on the driving shaft and limiting the bearing on the driving shaft.
8. The gantry type heavy-duty expanding forging machine set according to claim 6, wherein the driven shaft assembly comprises a driven shaft, a bearing and a second sliding shaft sleeve, the second sliding shaft sleeve is mounted on the driven shaft support frame, and the inner surface of the second sliding shaft sleeve is provided with a taper for guiding a tapered sleeve on the driven shaft and limiting the bearing on the driven shaft.
9. The gantry type heavy expanding forging machine set as claimed in claim 1, wherein the power output mechanism comprises a speed reducer and a universal coupling, and the speed reducer is connected with the driving shaft through the universal coupling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010759363.9A CN111872314B (en) | 2020-07-31 | 2020-07-31 | Gantry type heavy expanding and forging machine set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010759363.9A CN111872314B (en) | 2020-07-31 | 2020-07-31 | Gantry type heavy expanding and forging machine set |
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| Publication Number | Publication Date |
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| CN111872314A true CN111872314A (en) | 2020-11-03 |
| CN111872314B CN111872314B (en) | 2022-03-15 |
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| CN210318250U (en) * | 2018-12-10 | 2020-04-14 | 镇江市高等专科学校 | Conical surface friction type torque limiter |
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