JPS589797A - Screw press - Google Patents

Abstract

PURPOSE:To perfrom highly accurate pressing efficiently by providing a main internal thread and auxiliary internal thread in an auxiliary slide and engaging the auxiliary thread and main thread to the auliliary internal thread and main internal thread, and transmitting rotation of auxiliary thread caused by upward and downward movement of the auxiliary slide to the main thread through a gear. CONSTITUTION:A main internal thread 4 and an auxiliary thread 6 are installed in an auxiliary slide that goes up and down by oil pressure etc., and the auxiliary internal thread 6 and main internal thread 4 are engaged with an auxiliary thread 12 and a main thread 15 respectively. Accordingly, rotation of the auxiliary thread 12 caused by upward and downward movement of the auxiliary slide 5 is transmitted to the main thread 15 through gears 24, 25, and raises and lowers a main slide 3 that engages with the main screw 15. A flywheel 18 is rotated at the upper end of the main thread 15 through fluid. The flywheel is made hollow and fluid is sealed in it. Thus, moment of inertia of the flywheel 18 is increased.

Description

[Detailed description of the invention] This invention relates to a screw press.

Conventional screw presses use a motor to rotate a flywheel and transmit the rotation of this flywheel to the main screw.
The basic type is mTh, which raises and lowers a slide screwed onto this. This basic screw press requires a mechanism to engage the clutch and connect the flywheel and main screw after the flywheel reaches a certain rotation and accumulates sufficient rotational energy, making the structure complicated. There are drawbacks such as poor work efficiency.

In addition, unlike the screw press described above, a small-diameter non-rotating auxiliary screw is raised and lowered by a cylinder operated by fluid such as hydraulic pressure, and a rotating body with a female thread screwed into this screw is rotated. There is also a known mechanism in which a main screw connected to the body is rotated, and a female screw engaged with the main screw is used to move the slide up and down.

However, such a known press combining a cylinder and a screw also has problems in terms of efficiency.

The purpose of this invention is to solve the problems of conventional screw presses as described above.

That is, in this invention, an auxiliary slide that is raised and lowered by hydraulic pressure or the like is provided with a first female screw and an auxiliary female screw, and an auxiliary screw and a main screw are screwed into the auxiliary female screw and the first female screw, respectively, so that the auxiliary slide moves up and down as the auxiliary slide moves up and down. The rotation of the auxiliary screw is transmitted to the main screw by a gear to raise and lower the main slide screwed onto the main screw, and the flywheel on the main screw is rotated via fluid at the upper end of the main screw. The foil is hollow to provide a screw press with a flowable inclusion inside.

The details of the present invention will be described below based on an embodiment shown in the accompanying drawings.

In the figure, reference numeral 1 is a frame, and at the bottom of this frame 1 there is a table 2 on which the lower die is attached, and above it there is a main slide 3 on which the upper die is attached, and this slide 3 is used as a counterbalance cylinder on both sides of the frame 1. 20.

4 is a single female screw fixed to the inside of the upper part of the slide 3, and on the outside of the upper half of this single female screw 4 is an auxiliary slide 5'' that cannot be rotated by a key or spline, but can slide slightly in the axial direction. A pair of left and right female screws 6 are fixed to both ends of the auxiliary slide 5, and both ends of the slide 5 are fitted along guide rails 26 fixed to the frame 1 to prevent rotation. shall be.

7 is the upper frame fixed on frame 1,
Auxiliary cylinders 8 operated by hydraulic pressure or the like are fixed to the outer sides of both ends of the frame 7, and piston rods 9 protruding from the lower ends of the auxiliary cylinders 8 are fixed to both ends of the auxiliary slide 5.

A pair of bearings 10 are attached to the upper frame 7, and each of the bearings 10 supports a rotary shaft 11 so as to be able to rotate freely but cannot be raised or lowered. It is screwed into the auxiliary screw 6 mentioned above. 13
is a bearing provided in the center of the upper frame 7, and this bearing 13
The main shaft 14 is supported in a rotatable but non-liftable manner. A main screw 15 integrally provided at the lower end of this main shaft 14! ;! It is screwed into the main female screw 4.

A lower disk 16 is fixed to the upper end of the main shaft 14, a central boss portion of this disk 16 is extended upward, and an upper disk 17 is attached to the outside thereof so as to be movable up and down and to rotate together with the main shaft 14. Both discs 16.17
The upper and lower inner parts of the flywheel 18 are sandwiched between them.

The flywheel 1 is a hollow annular one, and the upper disk 17 presses the flywheel 18 onto the lower disk 16 by the pressure of a spring whose elasticity can be adjusted with an adjustment nut. Therefore, the disks 16, 17 and the flywheel 18 are frictionally connected.

The outer circumferential surface of the inner circumferential wall 19 of the flywheel 1B has a second
As shown in the figure, a large number of inner blades 21 are fixed radially, and a large number of outer blades 23 which are bent on one side are also fixed to the inner peripheral surface of the outer peripheral wall 22 of this flywheel 18. is filled with a fluid filler 27 such as a liquid or granular material, and a brake device B is provided on the outer periphery of the flywheel 18 so that the flywheel 18 can be braked as required. .

24 in Fig. 1 is a gear fixed to the main shaft 14, and this gear 2
4 is meshed with gears 25 fixed to shafts 11 on both sides thereof. Further, these gears 24 and 25 have the same number of teeth.

In addition, each auxiliary screw 12 and main screw 15 should be a screw with a long lead, such as a trapezoidal 50 screw, and both auxiliary screws 1
2 is a left-hand thread, and the main screw 15 is a right-hand thread.

Next, the hydraulic circuit shown in FIG. 1 will be explained. 30 is an oil tank, 31 is a hydraulic pump, and is driven by a motor 32.

The oil feed pipe 33 that communicates with the discharge port of the hydraulic pump 30 has an IJ.
An IJ-f valve 34, a check valve 35, and an accumulator 36 are provided.

The oil feed pipe 33 is branched into two, one pipe 37 being connected to the upper ends of both the auxiliary cylinders 8, and the other pipe 38 being connected to the lower ends of both the auxiliary cylinders 8.

'In addition, the container pipes 37 and 38 are provided with switching valves 39 and 40, respectively.
An oil drain pipe 42 leading to the oil tank 30 is connected between the two pipes 37 and 38 via a plurality of check valves 41. A relief valve 43 is provided in the middle of this oil drain pipe 42, and the oil drain pipe 42 and Connecting the container pipe 37.38 with a switching valve 44.45,
When the switching valve 39 opens, the switching valve 45 also opens, and the switching valve 40 opens.
When the switching valve 44 opens, the switching valve 44 is also opened.

The screw press of this invention has the above-mentioned structure, and its operation will be explained below.

When the switching valve 39.45 is opened and the switching valve 40.44 is closed in the state shown in FIG. The oil in the lower part of the auxiliary cylinder 8 flows through the pipe 38 → switching valve 45 → oil drain pipe 42 and returns to the oil tank 30, so each piston rod 9 descends and pushes down the auxiliary slide 5.

When the auxiliary slide 5 descends in this way, the left and right female screws 6, which descend without rotating, descend along with the left and right auxiliary screws 12, which do not descend. Look and turn right.

For this reason, the gear 25 at the upper end of each shaft 11 rotates, turning the gear 24 meshing therewith, and causing the main shaft 14, which is integrated with the gear 24, to rotate to the left when viewed from above.

When the main shaft 14 rotates as described above, the main screw 15 also rotates, and the female screw 4 screwed into it moves downward without rotating, so the slide 3 descends and the upper die at its lower end and a lower die on table 2 to perform desired press working.

Furthermore, when the main shaft 14 rotates as described above, this main shaft 1
The flywheel 18 attached to 4 rotates in the direction of arrow 3 in FIG.
When the rotation of the flywheel 18 increases, the centrifugal force acting on the inclusion 27 increases, and the inclusion 27 enters the concave side of the outer blade 23 and rotates, increasing the inertia of the flywheel 18. Increase the moment.

When the slide 3 is lowered by the above action and the press work is completed, the switching valves 40 and 44 are opened and the switching valves 39 and 45 are closed, and the hydraulic pressure flows in the opposite direction to the above, and the piston rod 9 of the auxiliary cylinder 8 Rise. As a result, the auxiliary slide 5 rises, the rotating shaft 11 reverses, and the main shaft 1
4 is also reversed, and the slide 3 is also raised by the action of the main screw 15.

At this time, the flywheel rotates in the direction of the arrow in FIG.

Therefore, even if the inclusion 27 moves outward due to centrifugal force, it hits the surface of the blade 23 and cannot move into the blade 23, so the moment of inertia of one flywheel becomes smaller than when it descends.

This invention performs the above-mentioned function, and the female screw 6 attached to the auxiliary slide 5, which is raised and lowered by the auxiliary cylinder 8 operated by hydraulic fluid, etc., is integrally connected to the auxiliary screw 12 screwed into the female screw 6. The flywheel 18 and main shaft 14 are rotated together with the rotating shaft 11 through gears 25 and 24, and the slide 3 is raised and lowered by a main screw 15 integrated with the main shaft 14. The flywheel 18 is hollow, and has a large number of vanes 21 and 23 on the inside and outside, respectively, and contains a fluid filler 27 such as a liquid or granules. If large rotational energy is required when the slide 3 is lowered, the rotational moment of the flywheel 18 will increase due to the outward movement of the inclusions 27, and when the slide 3 is raised, the inclusions 27 will not move outward, so the flywheel will not move. The rotation of the wheel 18 becomes lighter, and the rising speed of the slide 3 and the like becomes faster.

Therefore, the angular velocity of the main screw 15 becomes faster, the time for lowering and raising the slide 3 is shortened, and the energy during the lowering is increased, so that the overall energy efficiency □ is increased. In addition, both ends of the auxiliary slide 5 are configured to slide along guide rails 26 provided on the frame 1 to maintain accuracy in the rotational direction of the slide, making high-precision press work more efficient. It has the effect of being able to perform

[Brief explanation of drawings]

FIG. 1 is a partially vertical front view including a hydraulic circuit of a screw press according to the present invention, and FIG. 2 is a cross-sectional plan view taken along line A--A in FIG. 1... Frame, 4... 1 female screw, 5... Auxiliary slide, 6... Auxiliary female screw, 8... Auxiliary cylinder,
DESCRIPTION OF SYMBOLS 11... Rotating shaft, 12... Auxiliary screw, 14... Main shaft, 15... Main screw, 18... Flywheel, 21
...Inner blade, 23...Outer blade, 24.25...
・Gear, 26...Guide rail, 27...Inclusion. Patent applicant: Fuji Sharyo Co., Ltd. Agent: Kama 1) Text 2, Figure 2, Addition

Claims (1)

[Claims] Both ends of the auxiliary slide are slidably engaged with guide rails on both sides of the frame so that they cannot rotate, and auxiliary cylinders for raising and lowering the auxiliary slide are provided on both sides of the frame. Attach the screw so that it cannot rotate but can move up and down slightly, and screw the main screw provided at the bottom of the main shaft, which is rotatably attached to the top of the frame, into the 1 female screw, and on both sides of the 1 female screw. (Here, the auxiliary screws provided at the lower ends of the pair of left and right rotating shafts rotatably attached to the top of the frame are screwed into the pair of left and right female auxiliary screws fixed to the auxiliary slide I. A hollow flywheel is fixed to the upper end of the main shaft, and a fluid inclusion is placed inside the flywheel, and the inclusion is removed by centrifugal force. A large number of inner blades are bent in the direction of moving the main slide in the direction of rotation when the main slide is lowered, and in the direction of rotation, the inclusions are scraped inward, and in the opposite direction of rotation, the inclusions are removed.
Screw press with outer blades.