JPH0570800U - Stick release device for mechanical press - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a stick detaching device that widens the guide range of the slide by providing a die height adjusting member on the slide portion and obtains a highly accurate press. A recessed hole formed in a slide 26 at a position corresponding to a slide adjusting screw 23 supported by a plunger guide 25 provided on a crown 24 of a press, which is connected to a lower end of a connecting rod 21 by a wrist pin 22. Mount the piston 29 in 27 and slide adjustment screw 23
The adjusting nuts 30 and 31 are connected to the thread portion of the adjusting nut 31, the worm shaft 34 is fitted to the worm wheel gear 33 of the adjusting nut 31, and the oil chamber 35 formed between the concave hole 27 and the piston 29 is formed. The gear center between the worm wheel gear 33 and the worm shaft 34 is eccentric by an eccentric amount corresponding to a maximum height of half the height of the oil chamber 35.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a stick releasing device for a mechanical press.

[0002]

[Prior Art]

 Many proposals have been made for a device for eliminating sticks in a mechanical press (one example: Jikkaisho 61-31600, etc.).

FIG. 3 shows a stick detaching device known from the above-mentioned Japanese Utility Model Publication No. 61-31600, which slides on the outer peripheral surface of a slide adjusting screw 5 which is driven up and down as the crankshaft 1 rotates. 12 is screwed together. Specifically, a piston rod 15 of a piston 14 which is vertically slidably fitted in a cylinder member 11 provided on the slide 12 is formed on a screw shaft, and the piston rod 15 Is screwed to the inner peripheral portion of the slide adjusting screw 5, and a hydraulic chamber 16 is formed between the bottom portion of the piston 14 and the cylinder member 11. The pressure oil is supplied to the hydraulic chamber 16 during the press operation, and when the stick state occurs, the pressure oil in the hydraulic chamber 16 is discharged to eliminate the stick state.

A lower end portion of the connecting rod 2 connected to the crankshaft 1 is formed in a ball shape, and the ball is incorporated in the slide 1 and is integrally formed with the slide adjusting screw 5. Combined with 7,8. Further, in order to rotate the bearing members 7 and 8, a worm wheel 4 and a worm shaft 3 screwed to the worm wheel 4 are provided outside the bearing members 7 and 8. For this reason, when the worm shaft 3 is rotated, the slide 12 moves up and down independently, whereby the die height can be adjusted.

In this prior art, since a die height adjusting device using a worm and a worm shaft is installed on the lower surface of the crown, a connecting portion between the connecting rod and the slide (specifically, a connecting portion between the connecting rod 2 and the slide adjusting screw 5). Therefore, the thrust component force of the connecting rod cannot be directly received, and this part does not have a function as a slide guide part. Of course, the slide is provided with a slide guide, but if the slide can be guided even on the lower surface of the crown, the slide will be guided in a wide range, preventing the slide from tilting during press operation and increasing the height. An accurate press can be obtained.

In addition to the above-mentioned conventional example, when a cast slide is provided with a hydraulic cylinder that constitutes a stick releasing device, the cast cannot prevent the leakage of high-pressure oil. It had a built-in cylinder. This inevitably complicates the structure, hinders the slide from becoming smaller and lighter, and is a cause of impeding high-speed operation.

[0007]

[Problems to be solved by the device]

 The problem to be solved by the present invention is to provide a worm wheel gear and a worm shaft for die height adjustment on the slide part so that the thrust component force of the connecting rod is received on the lower surface of the crown, thereby expanding the guide range of the slide. The purpose of the present invention is to provide a hydraulic stick releasing device that can obtain a more accurate press.

Another problem to be solved by the present invention is to reduce the size and weight of the slide by using a steel oil pan instead of a cylinder for the hydraulic chamber inside the slide to enable high-speed operation. It is to provide a hydraulic stick releasing device that can obtain various presses.

[0009]

[Means for Solving the Problems]

 Means for solving the problems in the present invention are a connecting rod connected to a crank portion of a crankshaft for driving a press, a lower end portion of the connecting rod being connected by a wrist pin, and the connecting portion being connected to a crown portion of the press. A slide adjusting screw supported by a provided plunger guide, a piston mounted in a recessed hole formed in a slide at a position corresponding to the slide adjusting screw, and a screw of the slide adjusting screw provided on the upper end of the piston. Of the adjusting nut screw-connected to the portion, the worm wheel gear formed on the adjusting nut, and the worm shaft screw-connected to the worm wheel gear and driven to rotate by an external drive mechanism, the recessed hole and the piston. An oil chamber formed between the worm wheel gear and the worm shaft, and the maximum height of the oil chamber Is to shall and characterized in that eccentrically in the eccentric amount corresponding to a height of one-half.

[0010]

【Example】

 1 and 2 show an embodiment, FIG. 1 shows an overall view, and FIG. 2 shows a main part. In the drawing, a connecting rod 21 connected to a crank portion of a crankshaft 20 is connected to a slide adjusting screw 23 by a wrist pin 22, and the connecting structure of the connecting rod 21 and the slide adjusting screw 23 in the embodiment is a so-called plunger type. Is. The connecting portion between the connecting rod 21 and the slide adjusting screw 23 is slidably supported by a plunger guide 25 provided on the crown 24.

A concave hole 27 having an upper surface opened is formed in the slide 26 at a position corresponding to the slide adjusting screw 23, and a lower end portion of the slide adjusting screw 23 is inserted into the concave hole 27. .. A steel oil pan 28 is fitted into the bottom of the recess 27, and a piston 29 is inserted into the oil pan 28. Furthermore, a ring-shaped first adjusting nut 30 and a second adjusting nut 31 are fitted in the recessed hole 27 at the upper end of the piston 29, and the screw of the slide adjusting screw 23 is screwed. The portion 23a is screwed to the first and second adjusting nuts 30 and 31.

A holding cylinder 32 fixed to the slide 26 is provided at the opening of the recessed hole 27, and the lower end of the holding cylinder 32 is joined to the upper surface of the first adjusting nut 30. The tubular portion supports the midway portion of the slide adjusting screw 23.

Further, a worm wheel gear 33 is formed on the outer peripheral portion of the second adjusting nut 31, and a worm shaft 34 screwed to the worm wheel gear 33 and connected to a rotary drive mechanism is provided. ing. Besides, an O-ring is attached to the outer side of the piston 29, and an oil chamber 35 is formed between the piston 29 and the oil pan 28.

According to the present invention, pressure oil is supplied to the oil chamber 35, and the worm wheel gear 33 and the worm shaft 3 are different from the height S of the oil chamber 35 when the pressure oil is supplied. The center of 4 is eccentrically provided by the eccentric amount of S / 2. In the embodiment, if the height of the oil chamber 35 as a hydraulic chamber is 1 mm, then the center of the worm wheel gear 33 is deviated upward by 0.5 mm from the center of the worm shaft 34. Therefore, when the pressure oil in the oil chamber 35 is discharged, the center of the worm wheel gear 33 is displaced downward by 0.5 mm from the center of the worm shaft 34.

Reference numeral 36 denotes a positioning pin, which is mounted between the slide 26 and the oil pan 28, between the oil pan 28 and the piston 29, and between the first adjusting nut 30 and the second adjusting nut 31, respectively. There is.

Reference numeral 37 is an oil supply pipe for supplying oil to the oil chamber 35, to which a pressure increasing pump 38 is connected, and a shutoff valve 39 and a pressure switch 40 are provided midway. On the other hand, the pressure increasing pump 38 is supplied with air from an air source 41 via a regulator 42 and a two-way valve 43.

The embodiment has the above-described structure, and the slide 26 is rotated by externally driving the worm shaft 34 in a state where the pressure oil in the oil chamber 35 is discharged, and the worm wheel gear 33, that is, the second adjustment. This is performed by rotating the nut 31 and the first adjustment nut 30. When the second and first adjusting nuts 31 and 30 rotate, the slide 26 moves up and down along the slide adjusting screw 23, whereby the die height is adjusted. In the exemplary embodiment, slide 26 is in the most raised position.

When performing a pressing operation, pressure oil is supplied from the oil supply pipe 32 to the oil chamber 35 to secure the oil chamber 35. When pressure oil is supplied to the oil chamber 35, the piston 29 pushes up the second adjusting nut 31, but the first adjusting nut 30 receives the reaction force of the pushing force by the lower end portion of the holding cylinder 32, and conversely. The second adjusting nut 31 is pushed down, whereby the slide adjusting screw 23 is locked, so that the slide adjusting screw 23 and the slide 26 are integrally formed without a gap.

Next, when a stick occurs, the pressure oil in the oil chamber 35 is drained and the backlash of the slide adjusting screw 23, the first and second adjusting nuts 30 and 31, the worm wheel gear 33, and the worm shaft 34 is utilized. To eliminate the stick condition.

The height of the oil chamber 35 is S when the pressure oil is supplied to the oil chamber 35, but the deviation between the centers of the worm wheel gear 33 and the worm shaft 34 is S of a maximum of 2 minutes. Moreover, since the worm gear also has a backlash, the worm shaft 34 is rotated even if the first and second adjusting nuts 30 and 31 are moved up and down by supplying pressure oil to the oil chamber 35. It is possible to do so.

Besides, when the slide 26 is guided by a slide guide (not shown), at the same time, the slide adjusting screw 23 is guided by the plunger guide 25, so that the slide can perform a stable vertical movement.

[0022]

[Effect of the device]

 According to the present invention, the worm wheel gear and the worm shaft for adjusting the die height of the slide are provided in the slide portion, so that the connecting portion between the connecting rod and the slide adjusting screw can be supported by the plunger guide provided in the lower portion of the crown. Therefore, it is possible to receive the thrust component force of the connecting rod at the relevant portion, and therefore it is possible to guide the slide in a wide range together with a slide guide that is separately provided. It is what you get.

Further, according to the present invention, the slide can be made smaller and lighter by using the steel oil pan instead of the cylinder for the oil chamber installed in the slide, and thus the press capable of high speed operation. Is obtained.

[Brief description of drawings]

FIG. 1 is an overall cross-sectional view of an assembled device of the present invention.

FIG. 2 is a sectional view showing a main part of FIG.

FIG. 3 is a sectional view showing an example of a conventional device.

[Explanation of symbols]

 20 crankshaft 21 connecting rod 22 wrist pin 23 slide adjusting screw 24 crown 25 plunger guide 26 slide 27 recessed hole 28 oil pan 29 piston 30 first adjusting nut 31 second adjusting nut 32 holding cylinder 33 worm wheel gear 34 worm shaft 35 oil chamber 36 Positioning Pin 37 Oil Supply Pipe 38 Booster Pump 39 Shut-Off Valve 40 Pressure Switch 41 Air Source 42 Regulator 43 Two-Way Valve

Claims (3)

[Scope of utility model registration request] 1. A connecting rod connected to a crank portion of a crankshaft for driving a press, a slide connected to a lower end portion of the connecting rod by a wrist pin, and the connecting portion being supported by a plunger guide provided in a crown portion of the press. Adjusting screw, a piston mounted in a recess formed in a slide at a position corresponding to the slide adjusting screw, an adjusting nut provided on an upper end portion of the piston and screw-coupled to a screw portion of the slide adjusting screw, the adjusting nut A worm wheel gear formed on the worm wheel, a worm shaft screw-connected to the worm wheel gear and driven to rotate by an external drive mechanism, and an oil chamber formed between the recessed hole and the piston. The center of the gear between the wheel gear and the worm shaft is eccentric with an eccentric amount corresponding to a maximum height of half the height of the oil chamber. A stick release device for mechanical presses, which is characterized by being mindful. 2. The stick releasing device for a mechanical press according to claim 1, wherein the oil chamber is formed by a steel oil pan mounted in the recess and a piston fitted in the oil pan. .. 3. The adjusting nut comprises first and second adjusting nuts, the two adjusting nuts are connected by a positioning pin, and the first adjusting nut is engaged with a slide. The stick removing device for a mechanical press according to claim 1.