Patent Application
20250178243
The present invention relates to a mold locking mechanism for a hydraulic press.
Referring to
Referring to
However, the conventional hydraulic press has defects as follows: when the limiting sheet 93 is located on the first position and the mold holder 91 crawls or drops to actuate the pull stud 95 to move downward, one defining ring 97 presses the limiting sheet 93, so the limiting sheet 93 cannot be switched to the second position, and the mold holder 91 is driven to actuate the pull stud 95 to move upward so that the one defining ring 97 is removed from the limiting sheet 93, and the cylinder 92 drives the limiting sheet 93 to switch to the second position, and a switch is pressed manually to control the mold holder 91 to move upward, but an upward moving distance of the mold holder 91 is not controlled accurately. When the upward moving distance of the mold holder 91 is excessive, the other defining ring 97 below the limiting sheet 93 moves upward to hit the defining sheet 93, thus breaking the limiting sheet 93.
The present invention has arisen to mitigate and/or obviate the afore-described disadvantages.
The primary aspect of the present invention is to provide a mold locking mechanism for a hydraulic press which is capable of enhancing using safety and reducing damage rate.
To obtain above-mentioned aspect, a mold locking mechanism for a hydraulic press provided by the present invention contains: a bottom plate.
A pull stud is inserted through the bottom plate, and the pull stud includes a shank and multiple defining rings separately fitted on the shank, a top face of a respective one defining ring is a conical surface, and the bottom plate further includes a clamper and a drive device. The clamper includes a pair of rotatable arms intersected on a top of the bottom plate, two front sections of the pair of rotatable arms are located beside the pull stud, and at least one resilient element is defined between two rear sections of the pair of rotatable arms.
When the clamper is in a clamping state, the at least one resilient element forces the two front sections of the pair of rotatable arms to move close to each other, and the respective one defining ring of the pull stud does not pass across a gap of the two front sections of the pair of rotatable arms.
The drive device drives the pair of rotatable arms to rotate so that the clamper is switched to be in a unclamping state, and the respective one defining ring of the pull stud moves across the gap of the two front sections of the pair of rotatable arms after the pair of rotatable arms move away from each other.
With reference to
The drive device 5 is mounted on the bottom plate 1 and is located on a rear end of the clamper 30, the drive device 5 includes a fixing plate 6 disposed on a front end of an actuation segment 50 of the drive device 5, and the bottom plate 1 includes at least one guide rail 7, wherein the fixing plate 6 is slidably arranged on the at least one guide rail 7 via a slider 71, and the fixing plate 6 includes two locating posts 61 extending from two sides thereof, wherein the fixing plate 6 also includes two first bearings 62 fitted on the two locating posts 61.
The drive device 5 is a cylinder, and the actuation segment 50 of the drive device 5 pushes the fixing plate 6 so that the two first bearings 62 of the fixing plate 6 abut against and push two internal faces 31 of the two rear sections of the pair of rotatable arms 3 to drive the pair of rotatable arms 3 to rotate. Since a rolling friction generates among the two first bearings 62 and the pair of rotatable arms 3, the pair of rotatable arms 3 have little wear and tear to prolong a service life. The drive device 5 is a screw-nut mechanism configured to push the two internal faces 31 of the two rear sections of the pair of rotatable arms 3 to drive the pair of rotatable arms 3 to rotate. In another embodiment, the drive device 5 is any one of a crank-slider mechanism, a hydraulic cylinder, and a cam mechanism. In this embodiment, the drive device 5 is the cylinder to reduce a cost.
A fixing shaft 11 is defined between the drive device 5 and the through orifice 10 of the bottom plate 1 and is configured to rotatably connect with the pair of rotatable arms 3, wherein a second bearing 33 is defined between a respective one rotatable arm 3 and the fixing shaft 11, the pair of rotatable arms 3 include two recesses 32 so that one rotatable arm 3 is engaged with the other rotatable arm 3 by using the two recesses 32. A ball bearing 34 is defined between the pair of rotatable arms 3 and is fitted on the fixing shaft 11 so that the pair of rotatable arms 3 rotate flexibly in accurately.
As shown in
The respective one rotatable arm 3 includes a tilted extension 35 formed on a front section thereof so that a contact area of a respective one tilted extension 35 and the bottom face 222 of the respective one defining ring 22 is increased since the respective one tilted extension 35 is oblique, thus enhancing a support capacity of the pull stud 2. In the original state, the at least one resilient element 4 defined between the two rear sections of the pair of rotatable arms 3 forces the two tilted extensions 35 on the two front sections of the pair of rotatable arms 3 to move close to each other, wherein the two tilted extensions 35 are parallel to each other. The respective one rotatable arm 3 further includes a guiding rod 36 extending downward from a rear end thereof to the bottom plate 1, wherein at least one third bearing 37 is fitted on a distal end of the guiding rod 36 of the respective one rotatable arm 3 and is received in an arcuate orifice 12 of the bottom 1 so that the respective one rotatable arm 3 rotates accurately.
The clamper 30 is configured to clamp or unclamp a workpiece (not shown). In the original state, as shown in
Referring to
When the upward moving distance of the mold holder 82 is excessive, the one defining ring 22 below the pair of rotatable arms 3 moves upward to hit the pair of rotatable arms 3. Due to the top face 221 of the respective one defining ring 22 is the conical surface, the two tilted extensions 35 of the pair of rotatable arms 3 slide across the top face 221 of the respective one defining ring 22 and move away from each other, during the one defining ring 22 hits the pair of rotatable arms 3. Accordingly, after the two tilted extensions 35 of the pair of rotatable arms 3 are hit by the one defining ring 22, the pair of rotatable arms 3 are not broken.
The hydraulic press 8 includes a passing hole 80 defined on a locating sheet 81 thereof, and a bottom of the pull stud 2 is fixed on the mold holder 82 of the hydraulic press 8 via the passing hole 80.
In use, the actuation segment 50 of the drive device 5 drives the clamper 30 to be in the unclamping state, and when the mold holder 82 of the hydraulic press 8 actuates the pull stud 2 to move upward and downward reciprocately and moves upward to a desired height and position, the clamper 30 is switched to be in the clamping state. Since the at least one defining ring 22 is located above the clamper 30, when a hydraulic system of the hydraulic press 8 produces a leakage and the mold holder 82 of the hydraulic press 8 drops downward, the bottom face 222 of the one defining ring 22 above the clamper 30 abuts against and presses the pair of rotatable arms 3, hence the one defining ring 22 of the pull stud 2 does not pass across the gap M of the two tilted extensions 35 of the pair of rotatable arms 3, as illustrated in
While the first embodiments of the invention have been set forth for the purpose of disclosure, modifications of the disclosed embodiments of the invention as well as other embodiments thereof may occur to those skilled in the art. The scope of the claims should not be limited by the first embodiments set forth in the examples, but should be given the broadest interpretation consistent with the description as a whole.
