Patent Application
20250178249
The present invention relates to a safety device for a hydraulic press.
When a hydraulic system causes leakage after a mold holder of a conventional hydraulic press moves upward, the mold holder crawls or drops to have an accident. Also, the safety device of the conventional hydraulic press has a poor loading capacity that cannot be applicable for the hydraulic press with a large tonnage. Alternatively, when the hydraulic press has a large loading capacity, but it is complicated and has a high maintenance cost.
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 safety device for a hydraulic press which is capable of enhancing using safety.
To obtain above-mentioned aspect, a safety device for a hydraulic press provided by the present invention contains: a bottom plate.
The bottom plate includes a through orifice and a pull stud inserted through the through orifice. The pull stud includes a shank and at least one defining ring, and the bottom plate includes a clamper which has an abutting projection mounted above a top of the bottom plate. The abutting projection has two tilted swing arms rotatably connected on two sides thereof, and two extensions of the two tilted swing arms are located on two sides of the pull stud. A respective one tilted swing arm includes an elongated orifice extending thereon from a central section of the respective one tilted swing arm, and the elongated orifice slidably accommodates a guide rod. The bottom plate further includes a drive device mounted thereon and located behind the abutting projection, and the drive device includes a pushing element.
With reference to
In this embodiment, the drive device 5 is a cylinder. In another embodiment, the drive device 5 is a screw-nut mechanism so that a screw rod of the drive device 5 is configured to push the abutting projection 31 to move forward. Also, 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.
The clamper 3 is configured to clamp or unclamp a workpiece (not shown). In an original state, the clamper 3 is in the clamping state, wherein two extensions 41 of the two tilted swing arms 4 move close to each other to produce a gap M, and the gap M of the two extensions 41 on the virtual longitudinal axis V is smaller than a diameter B of the respective one defining ring 22 of the pull stud 2, i.e., M<B, such that the respective one defining ring 22 of the pull stud 2 does not pass across the gap M of the two extensions 41 of the two tilted swing arms 4 in the clamping state. The pushing element 61 of the drive device 6 pushes the abutting projection 31 to move forward, thus switching the clamper 3 to be in an unclamping state. In other words, the two extensions 41 of the two tilted swing arms 4 are spaced from each other so that a gap N of the two extensions 41 of the two tilted swing arms 4 on the virtual longitudinal axis V is larger than a diameter B of the respective one defining ring 22 of the pull stud 2, i.e., N>B. Also, When the two extensions 41 of the two tilted swing arms 4 are spaced from each other, the gap N of the two extensions 41 of the two tilted swing arms 4 on the virtual longitudinal axis V is larger than a diameter Q of the through orifice 10 of the bottom plate 1, i.e., N>Q, such that the respective one defining ring 22 of the pull stud 2 passes across the gap N of the two extensions 41 of the two tilted swing arms 4, when the two extensions 41 of the two tilted swing arms 4 are spaced from each other.
The bottom plate 1 further includes a positioning protrusion 32 connected with the abutting projection 31 and at least one returning spring 33 defined between the positioning protrusion 32 and the abutting projection 31, wherein a first end of the returning spring 33 abuts against the positioning protrusion 32, and the other end of the returning spring 33 contacts with and pushes the abutting projection 31. In other words, the abutting projection 31 is pushed by the returning spring 33 to move rearward so that the clamper 3 is switched to be in the clamping state from the original state.
The abutting projection 31 has two guiding blocks 34 extending from two sides thereof and located on the bottom plate 1, and the two guiding blocks 34 have two slide grooves 35 defined therein, wherein the abutting projection 31 is slidably defined between the two slide grooves 35.
At least one tension spring 36 is defined between the two tilted swing arms 4 and is located ahead of the guide rod 5, wherein the at least one tension spring 36 is configured to switch the clamper 3 to be in the clamping state from the unclamping state, and the clamper 3 is in the clamping state when in the original state.
As shown in
The guide rod 5 is screwed with at least one nut 51, and the at least one nut 51 contacts with the two tilted swing arms 4.
Referring to
When the upward moving distance of the mold holder 72 is excessive, the one defining ring 22 below the two tilted swing arms 4 moves upward to hit the two tilted swing arms 4. Due to the top face 221 of the respective one defining ring 22 is the conical surface, the two extensions 41 of the two tilted swing arms 4 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 two tilted swing arms 4. Accordingly, after the two tilted swing arms 4 are hit by the one defining ring 22, the two tilted swing arms 4 are not broken.
The two extensions 41 of the two tilted swing arms 4 are arcuate so that when the two extensions 41 of the two tilted swing arms 4 contact with the bottom face 222 of the one defining ring 22, a contacting area of the two extensions 41 of the two tilted swing arms 4 is increased to enhance a loading capacity.
The hydraulic press 7 includes a passing hole 70 defined on the support plate thereof, and a bottom of the pull stud 2 is fixed on the mold holder 72 of the hydraulic press 7 via the passing hole 70.
When the hydraulic press 7 operates, the pushing element 61 of the drive device 6 drives the abutting projection 31 to move forward so that the clamper 30 is switched to be in the unclamping state, and the mold holder 72 of the hydraulic press 7 actuates the pull stud 2 to move upward and downward reciprocately. When the mold holder 72 of the hydraulic press 7 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 7 produces a leakage and the mold holder 72 of the hydraulic press 7 drops downward, the bottom face 222 of the at least one defining ring 22 abuts against and presses the two tilted swing arms 4, hence the one defining ring 22 above the clamper 3 does not pass across the gap M of the two extensions 41 of the two tilted swing arms 4, 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.
