Summary of the invention
Technical problem to be solved by this invention is: provide a kind of piston rod insertion force little, and easily extract the positional cylinder of the locating hole of taper.
The technical solution adopted for the present invention to solve the technical problems is: a kind of positional cylinder for drum is positioned, comprise cylinder body, piston rod and be arranged on the piston in cylinder body, piston rod in cylinder body is divided into thick portion and thin portion, at the joining place of thick portion and thin portion, be formed under hydraulic oil effect and promote piston rod to the step of drum one side shifting, piston is sleeved on the thick portion of piston rod slidably, in the thick portion of piston rod, has and prevents that piston landing is to the limiting component of thin portion.
Limiting component is position limiting convex ring.
Further limit, on positional cylinder, there is detection piston rod and whether move to the position of insertion locating hole and the checkout gear whether piston rod moves to the position of extracting locating hole.
Further limit, checkout gear comprises posts a letter dish and detects two switches of posting a letter of the dish position of posting a letter, and one end away from drum of piston rod passes cylinder body, and the dish of posting a letter is arranged on one end away from drum of piston rod.
The invention has the beneficial effects as follows: the latch power that offers piston rod due to step is moderate, simultaneously because piston and the piston rod of positional cylinder are split type, and piston can move freely on piston rod.Piston can produce certain impulse force to position limiting convex ring when extracting piston rod, contributes to piston rod to extract.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described;
Fig. 1 is the structural representation of positional cylinder of the present invention;
Fig. 2 is the overall structure schematic diagram that adopts the drum assembly positioning of positional cylinder of the present invention;
Wherein, 1. drum, 2. positional cylinder, 2-1. piston rod, 2-2. piston, 2-3. step, 2-4. position limiting convex ring, the 2-5. dish of posting a letter, the 2-6. switch of posting a letter, 3-1. servomotor, 3-2. decelerator, 3-3. Timing Belt, 3-4. synchronous pulley.
The specific embodiment
As shown in Figure 1, positional cylinder 2 comprises cylinder body, piston rod 2-1 and is arranged on the piston 2-2 in cylinder body, cylinder body is arranged in frame by flange, piston rod 2-1 in cylinder body is divided into thick portion and thin portion, at the joining place of thick portion and thin portion, be formed under hydraulic oil effect and promote piston rod 2-1 to the step 2-3 of drum 1 one side shiftings, piston 2-2 is sleeved on the thick portion of piston rod 2-1 slidably, thick portion at piston rod 2-1 has the limiting component that prevents the extremely thin portion of piston 2-2 landing, and limiting component is specially position limiting convex ring 2-4.On positional cylinder 2, there is detection piston rod 2-1 and whether move to the position of insertion locating hole and the checkout gear whether piston rod 2-1 moves to the position of extracting locating hole.Checkout gear comprises post a letter dish 2-5 and two switch 2-6 that post a letter that detect the dish 2-5 position of posting a letter, the switch 2-6 that posts a letter adopts approach switch, one end away from drum 1 of piston rod 2-1 passes cylinder body, and the dish 2-5 that posts a letter is arranged on one end away from drum 1 of piston rod 2-1.
As shown in Figure 2, a kind of drum assembly, comprises rack-mounted drum 1, calibration driving mechanism, detent mechanism and drum clamp mechanism, and drum 1 is arranged on frame by drum axle, has a plurality of stations on drum 1, on each station, has work piece holder.Calibration driving mechanism and detent mechanism are positioned at the same side of drum 1, and drum clamp mechanism is positioned at the opposite side of drum 1.Frame comprises the left and right sidesing wall plate of drum both sides, be positioned at left and right sidesing wall plate top connection left and right sidesing wall plate determine beam.Detent mechanism comprises the locating hole of rack-mounted positional cylinder 2 and drum 1 side, when drum 1 rotates to station position, the piston rod 2-1 of positional cylinder 2 stretches out the locating hole that inserts drum 1 side, drum 1 is positioned, locating hole is taper hole, and the head end of the insertion locating hole of piston rod 2-1 is the conehead coordinating with taper hole.
Because the piston 2-2 of positional cylinder 2 and piston rod 2-1 are split type, and piston 2-2 can move freely on piston rod 2-1.When positional cylinder 2 location, hydraulic pressure oil enters in cylinder body from right cavity of cylinder, the pressure-acting of hydraulic pressure oil is on piston 2-2 and piston rod 2-1, make piston 2-2 to drum 1 one side shiftings, piston rod 2-1 is also promoted to drum 1 one side shiftings by hydraulic pressure oil simultaneously, until the conehead of piston rod 2-1 inserts locating hole, now, physical dimension, to guarantee that the position limiting convex ring 2-4 on piston rod 2-1 has certain distance apart from piston 2-2.When the conehead of piston rod 2-1 inserts locating hole, its active force also be can't help piston 2-2 and is provided, but is provided by the step 2-3 on piston rod 2-1, because step 2-3 size is little, therefore offers the latch power of piston rod 2-1 not very big, and this is just meeting instructions for use; And contrary, when pulling pin, by the hydraulic pressure oil that enters the left chamber of oil cylinder, promote piston 2-2 to be moved to the left, after the position limiting convex ring 2-4 that meets piston rod 2-1, drive piston rod 2-1 to be moved to the left, complete the action of pulling pin.
When the conehead of piston rod 2-1 inserts after locating hole, owing to producing blocking force, the difficulty that becomes that makes to pull pin, and piston 2-2 moves right while meeting position limiting convex ring 2-4 and produces certain impulse force, contributes to piston rod 2-1 to extract.This is the unique distinction of this positional cylinder 2 just.
Calibration driving mechanism drives drum 1 rotation to each station by calibration requirement, calibration driving mechanism comprises servomotor 3-1, decelerator 3-2, Timing Belt 3-3 and synchronous pulley 3-4, synchronous pulley 3-4 is arranged on the output shaft of drum axle and decelerator 3-2, between synchronous pulley 3-4 on decelerator 3-2 and the synchronous pulley 3-4 on drum axle, by Timing Belt 3-3, drive and be connected, the main shaft of servomotor 3-1 directly inserts the input of decelerator 3-2, and servomotor 3-1 rotates by decelerator 3-2 drive drum wheel shaft.
The drum assembly of 8 stations of take is example, and its course of action is as follows:
1, machine tool numerical control system sends drum and starts to turn round instruction, and servomotor 3-1 rotates, and drives a gapless decelerator 3-2, the speed reducing ratio i=250 of this decelerator.
2, at the output of decelerator 3-2, one synchronous pulley 3-4 has been installed, this synchronous pulley 3-4 drives Timing Belt, transmits motion to a synchronous pulley 3-4 of drum axle head, and modulus, the number of teeth of two synchronous pulley 3-4 are identical, realize 1:1 transmission.
3, the synchronous pulley 3-4 of drum end just drives drum 1 to realize revolution, when station of drum 1 revolution (during 8 station, design angle of revolution is 22.5 °), turns round the switch of posting a letter and sends signal.
4, system receives after the signal sending, and sends the action of positional cylinder 2 location, and three positional cylinders 2 that are arranged in the right wallboard of drum 1 move immediately, complete location, and the approach switch of the checkout gear of positional cylinder 2 also sends settling signal.
5, system receives after this signal, sends drum and clamps instruction, and clamping cylinder 4-3 moves immediately, drives locking screw cover 4-1 to rotate, and drum 1 clamps immediately, and clamping switch sends the signal having clamped.