KR100648532B1 - Spring Automatic Return Hydraulic Tool - Google Patents

Abstract

The present invention relates to a spring type automatic return hydraulic tool, the clamp is fixed to the workpiece; A die head installed to guide the clamp to fix a workpiece on the clamp; A cylinder having one end fixed to the clamp, an operation space formed therein, and one end of the die head inserted therein, and having a plurality of oil supply passages and oil discharge passages connected to the operation space; A piston which is installed to be transported along this in the working space of the cylinder to convey the die head; An oil tank connected to the oil supply passages and the oil discharge passages of the cylinder to supply the stored oil to the working space side of the cylinder or to recover and store the oil in the working space of the cylinder; Pumping means installed in the cylinder, connected to the oil tank and the working space by the oil supply passages, and pumping oil in the oil tank to the working space of the cylinder; A return means installed in the cylinder, connected to the working space and the oil tank by the oil discharge passages, and returning oil in the working space to the oil tank side; And a control unit connected to the motor and operating the return means when the fixed pressure of the workpiece by the clamp and the die head reaches a set pressure.

Therefore, when the on / off switch is turned on, the workpiece is automatically gripped at a proper pressure between the clamp and the die head, so that the workpiece can be gripped easily and reliably, and the oil is continuously pumped into the cylinder to set the hydraulic pressure in the cylinder. When the motor reaches up to the motor, the operation of the motor is automatically stopped by the controller and the hydraulic pressure in the cylinder is automatically released. Therefore, excessive load is not applied to the motor, the reducer, and the pumping means, and the damage to the parts is prevented. The automatic return of the head makes the work of separating the workpiece from the hydraulic tool very convenient.

Description

Spring type automatic return oil pressure tool

1 is a partial side cross-sectional view showing the present invention spring type automatic return hydraulic tool

Figure 2 is a partial cross-sectional view showing the main portion of Figure 1

3 is a partial side cross-sectional view magnifying the main portion of FIG.

4 is an enlarged partial cross-sectional view of the main portion of FIG.

Figure 5 is a side cross-sectional view of the cylinder

6 is a cross-sectional plan view taken from the cylinder

7 is a partial side cross-sectional view showing a power conversion unit of the pumping means;

Figure 8 is a side cross-sectional view showing an oil supply valve

9 is a side cross-sectional view showing a suction valve

10 to 12 are side cross-sectional views sequentially showing a state in which the pumping means is actuated to compress the piston;

13 and 14 are a plan sectional view showing a state in which oil in the cylinder is recovered to the oil tank by driving of the motor is stopped, and a partially enlarged plan sectional view

* Description of the symbols for the main parts of the drawings *

1: Workpiece 10: Clamp

20: die head 30: cylinder body

31: operating space 32: first installation space

33: second installation space 34: third installation space

35: first oil supply passage 36: second oil supply passage

37: 1st oil discharge passage 38: 2nd oil discharge passage

40: cylinder cover 50: cylinder

61: piston 62: oil tank

70: drive unit 71: motor

72: reducer 80: power converter

81: cam housing 82: cam cover

83: camshaft 84: rotation shaft

85: cam 86: support bearing

87: operating bearing 90: pumping part

91: plunger 92: plunger post

93: spring cap 94: plunger spring

100: pumping means 110: oil supply valve

111: multi-base 112: spring casing

113,123: Ball push 114,124: Steel ball

115,125: Ball spring 116: Strainer

117: magnet pin 120: suction valve

121: check body 122: ball casing

130: piston spring 140: relief valve

141: relief face 142: valve post

142a: (valve post) cock 143: relief feed 144: slider 145: relief spring

150: return means 160: control unit

161: circuit board 162: battery

163: on / off switch

The present invention relates to a spring type automatic return hydraulic tool, and more particularly, the gripping work is very easy, the hydraulic pressure in the cylinder is automatically released when the work is gripped to the pressure set by the clamp and die head, It is related with the spring type automatic return hydraulic tool which automatically returns the die head holding the workpiece when the hydraulic pressure in the cylinder is released.

Hydraulic tools are commonly used to properly grip workpieces when cutting or machining them. In such a hydraulic tool, it is already known to use a hydraulic pressure generated from a hydraulic pump by connecting a pressure hose to a hydraulic pump provided separately.

Such a conventional hydraulic tool can reliably grip a workpiece by a large force of hydraulic pressure generated in the hydraulic pump, and if the length of the pressure resistant hose is properly adjusted, the hydraulic tool can be used at a place relatively far from the hydraulic pump.

On the other hand, there has also been known a gripping type hydraulic tool with a built-in hydraulic pump. This hydraulic pump built-in hydraulic tool is operated by the operator repeatedly pressing the operating lever by hand to operate the hydraulic pump. Thus, while operating the hydraulic pump, the tool head is transported to hold the workpiece.

However, the former of the above-mentioned hydraulic tools is used by connecting the pressure hose between the hydraulic tool and the hydraulic pump provided separately, and the movement of the operator is hindered by the extended pressure hose, and the pressure hose It was difficult for the worker to transfer the hydraulic tool quickly, and the workability was greatly reduced because the hydraulic pump of the separately installed weight must be transported every time the working place was changed.

The latter hydraulic tool has solved the above-mentioned problems caused by the pressure hose and the hydraulic pump, but since the operator has to press the operating lever by hand repeatedly to operate the hydraulic pump, the work is very complicated. A weighting problem has arisen.

SUMMARY OF THE INVENTION An object of the present invention for solving the above problems is to provide a spring type automatic return hydraulic tool which makes the work of gripping a workpiece very simple.

It is another object of the present invention to provide a spring type automatic return hydraulic tool which automatically releases hydraulic pressure in a cylinder when a workpiece is held to a pressure set by a clamp and a die head.

Still another object of the present invention is to provide a spring type automatic return hydraulic tool for automatically returning a die head holding a workpiece when the pressure of the cylinder is released.

Spring automatic return hydraulic tool of the present invention for achieving the above object, the clamp is fixed to the workpiece; A die head installed to guide the clamp to fix a workpiece on the clamp; A cylinder having one end fixed to the clamp, an operation space formed therein, and one end of the die head inserted therein, and having a plurality of oil supply passages and oil discharge passages connected to the operation space; A piston which is installed to be transported along this in the working space of the cylinder to convey the die head; An oil tank connected to the oil supply passages and the oil discharge passages of the cylinder to supply the stored oil to the working space side of the cylinder or to recover and store the oil in the working space of the cylinder; Pumping means installed in the cylinder, connected to the oil tank and the working space by the oil supply passages, and pumping oil in the oil tank to the working space of the cylinder; A return means installed in the cylinder, connected to the working space and the oil tank by the oil discharge passages, and returning oil in the working space to the oil tank side; And a controller connected to the motor and operating the return means when the fixed pressure of the workpiece by the clamp and the die head reaches a set pressure.

Another feature of the spring-type automatic return hydraulic tool of the present invention, the cylinder is formed between the first installation space, the operating space and the first installation space, the pumping means is installed, the second installation space connected to the operating space And a third installation space located between the first installation space and the oil tank, a first oil supply passage connecting the first installation space and the oil tank, and the first installation space and the second installation space. A cylinder body having a second oil supply passage, a first oil discharge passage connecting the operation space and the third installation space, and a second oil discharge passage connecting the third installation space and the oil tank; The cylinder cover is coupled to the cylinder body to open and close one side of the working space.

Another feature of the spring-type automatic return hydraulic tool of the present invention, an auxiliary space less than the operating space is further formed inside the operating space of the cylinder, the flow path guide block is coupled to the central portion of the auxiliary space, A pressurized flow path for connecting the second installation space and the operation space is further formed between the flow guide guide circumference and the inner circumferential surface of the auxiliary space corresponding thereto.

Another feature of the spring-type automatic return hydraulic tool of the present invention, the pumping means, a drive unit for generating a rotational power to pump the oil in the oil tank into the cylinder, and the rotational power of the drive unit is connected to the drive unit And a power converter for converting the motor into a reciprocating motion, and a pumping part installed in the first installation space of the cylinder and connected to the power conversion part to pump oil in the oil tank to the working space side of the cylinder.

Another feature of the spring-type automatic return hydraulic tool of the present invention, the drive unit is connected to the motor and the motor is a reducer for reducing the high speed rotation of the motor at a low speed.

Another feature of the spring-type automatic return hydraulic tool of the present invention, the power conversion unit, the cam housing is coupled to the circumference of the cylinder and the receiving space therein, the cam cover coupled to the open portion of the cam housing, and the reducer A cam shaft comprising a rotating shaft connected to the rotating shaft and a cam provided around the rotating shaft, and a support bearing installed between the cover and the rotating shaft to support the rotating shaft, and coupled to the cam to rotate the cam. It consists of an actuating bearing which is rotated together and reciprocated by the eccentric distance.

Another feature of the spring-type automatic return hydraulic tool of the present invention, the pumping part is located in the first installation space of the cylinder and one end is in contact with the actuating bearing plunger for linear reciprocating motion when the cam shaft rotates, A plunger post coupled to an inlet of a first installation space to guide the transfer of the plunger, and a spring coupled to the other end of the plunger and installed to slide along an inner circumferential surface of the first installation space so that the spring is moved up and down together when the plunger is elevated; A plunger spring is provided between the cap and the inner side of the first installation space and the spring cap to elastically support the plunger to the actuating bearing side.

Another feature of the spring type automatic return hydraulic tool of the present invention is that, in the first oil supply passage of the cylinder, the pumped oil is supplied from the oil tank only to the working space side of the cylinder and is prevented from flowing back in the reverse direction. The oil supply valve is further installed.

The oil supply valve has an inlet, a bottleneck, and a supply part sequentially formed therein, and one end of the supply part is coupled to the first oil supply passage, and the other end of the inflow part is in the oil tank. A multi-base to be positioned, a spring casing penetrating the inside and fixed in the supply part of the multi base, a ball push penetrating the inner part and opposed to the spring casing and being installed to slide along the feed part of the multi base; A steel ball provided between the bottlenecks of the push and the multi base to open and close the bottleneck, a ball spring installed between the spring casing and the ball push to elastically support the ball push and the steel ball toward the bottleneck; Installed in the inlet of the multi-base to filter foreign matter in the oil passing therethrough It consists of a strainer.

Another feature of the spring-type automatic return hydraulic tool of the present invention, inside the strainer, the magnet pin is further provided so that foreign substances of the magnetic material contained in the oil is filtered.

Another feature of the spring-type automatic return hydraulic tool of the present invention, in the second installation space, the suction valve to prevent the pumped oil is supplied from the second oil supply passage only to the working space side and reverse flow in the reverse direction Is installed more.

The suction valve has a check body penetrating the inside and coupled to the second installation space, a ball casing coupled to the check body and penetrating therein so as to have a bottleneck, and the bottleneck connected to the second oil supply passage of the cylinder. And, a ball push that is penetrated inside and slides inside the check body and the ball casing, a steel ball provided between the ball push and the ball casing to open and close the bottleneck, and installed between the check body and the ball push. It is made of a ball spring to elastically support the ball push and the steel ball to the bottleneck side.

 Another feature of the present spring type automatic return hydraulic tool, the return means is installed in the working space of the cylinder and the piston spring for restoring the piston transported by the hydraulic pressure when the pumping means is stopped, and the It is installed in the third installation space and connected to the first oil discharge passage and the second oil discharge passages, while connecting the first oil discharge passage and the second oil discharge passage while the piston spring is restored, the oil in the operating space It consists of a relief valve to be recovered to the oil tank.

The relief valve is provided in the third installation space and a relief face having a through hole formed to be connected to the first oil discharge passage, and installed therein so as to be transported along the inside of the third installation space and through the relief face. A valve post having a cock formed at an opposite end thereof to open and close a hole, a relief rod coupled to the third installation space and guiding the transfer of the valve post, and a third installation space between the relief face and the relief load. It is installed to slide and consists of a slider which is conveyed with the transfer of the valve post, and the relief spring is installed between the relief and the slider to elastically support the slider toward the relief face side.

Another feature of the spring-type automatic return hydraulic tool of the present invention, the control unit, the workpiece so that the relief valve is opened while the piston spring of the compressed state is restored when the hydraulic pressure inside the cylinder reaches the set pressure, the workpiece It is configured to stop the motor at the end of the fixing operation and processing operation of.

Therefore, when the on / off switch is turned on, the motor is driven and the die head is transferred, so that the workpiece is gripped at an appropriate pressure between the clamp and the die head, so that the workpiece can be easily and reliably gripped.

In addition, when the motor is driven, the driving unit, the power conversion unit and the pumping unit of the pumping means are operated so that the oil in the oil tank is operated by the oil supply valve, the first oil supply passage, the pumping unit, the second oil supply passage and the suction valve. As the pump is pumped into the space, the piston moves the die head while compressing the piston spring as the pumping means continue to be gripped by the workpiece.Oil is pumped into the cylinder and the hydraulic pressure in the cylinder reaches the set pressure. By the driving of the motor is automatically stopped by the hydraulic pressure in the cylinder is automatically released, the excessive load is not applied to the motor, the reducer and the pumping means to prevent component damage.

When the motor is stopped and the hydraulic pressure in the cylinder is released, the piston is returned by the restoring force of the piston spring. Accordingly, the oil in the working space is automatically transferred to the oil tank through the first oil discharge passage, the relief valve and the second oil discharge passage. At this time, since the die head is separated from the workpiece while being transported together with the piston, the die head is automatically returned at the same time as the end of the machining operation of the workpiece, which makes the work of separating the workpiece from the hydraulic tool very convenient. have.

Specific features and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings.

Figure 1 is a partial side cross-sectional view showing a spring automatic return hydraulic tool of the present invention, Figure 2 is a partial plan cross-sectional view showing the main portion of Figure 1, Figure 3 is a partial side cross-sectional view to enlarge the main portion of Figure 1, 4 is an enlarged partial cross-sectional view of the main part of FIG. 2, which includes a clamp 10 and a die head 20 for holding the workpiece 1 and a cylinder 50 for operating the die head 20. , Piston 61, oil tank 62, pumping means 100, return means 150, the control unit 160 is largely divided.

The clamp 10 is formed on the opposite side of the fixing portion 11 so that the fixing portion 11 formed on one side so that a part of the workpiece 1 is gripped, and the male screw portion 30a of the cylinder body 30 to be described later. A guide 12 formed between the fastening hole 13 and the fastening part 11 and the fastening hole 13 is formed so as to guide the lower part of the fastening part 21 of the die head 20 to be described later.

The die head 20 is installed to be guided by the clamp 10 to fix the work 1 on the clamp 10. The die head 20 is positioned to face the fixing portion 11 of the clamp 10 to hold the remaining portion of the work piece 1, and to extend from the fixing portion 21 to be described later. Located in the working space 31 of the cylinder 50 is composed of an extension 22 reciprocating with the piston 61.

One end of the cylinder 50 is fixed to the clamp 10, the working space 31 is formed therein, and one end of the die head 20 is inserted therein, and a plurality of oil supply passages are provided in the working space 31. And oil discharge passages are connected.

The shape of the cylinder 50 will now be described in more detail with reference to FIGS. 5 and 6, which illustrate only the cylinder 50. 5 is a side cross-sectional view taken from the cylinder, Figure 6 is a cross-sectional view taken from the cylinder, which is coupled to the cylinder body 30 and the cylinder body 30 to open and close one side of the working space 31 cylinder It consists of a cover 40.

The cylinder body 30 has a male screw portion 30a formed at one end to be fastened to the fastening hole 13 of the clamp 10, and has a piston 61 and a piston spring 130 to be described later inside. The working space 31 is formed.

The other side of the cylinder body 30 is formed with a first installation space 32 which is open downward, and the male thread portion of the plunger post 92 to be described later around the inlet side of the first installation space 32 ( The first female screw part 32a is formed to be fastened to 92a, and the pumping part 90 of the pumping means 100 to be described later is installed in the first installation space 32.

A second installation space 33 is formed between the operation space 31 and the first installation space 32 of the cylinder body 30 so as to be connected to the operation space, which will be described later around the second installation space 33. A second female screw portion 33a is formed to fasten the male screw portion 121a of the check body 121, and a suction valve 120 to be described later is installed in the second installation space 33.

A third installation space 34 is formed between the first installation space 32 of the cylinder body 30 and the other end of the cylinder body 30, and the circumference of the inlet side of the third installation space 34 will be described later. A third female screw portion 34a is formed to fasten the male screw portion 143a of the relief rod 143, and a relief valve 140 is installed in the third installation space 34.

The other end of the cylinder body 30 is coupled to the oil tank 62 to be described later, the first oil supply passage in the cylinder body 30 therebetween so that the oil tank 62 and the first installation space 32 is connected. 35 is formed. A female screw portion 35a is formed around the inlet side of the first oil supply passage 35 so that the male screw portion 111a of the oil supply valve 110, which will be described later, is engaged. A second oil supply passage 36 is formed between the first installation space 32 and the second installation space 33 to connect them.

In addition, a first oil discharge passage 37 is formed between the operating space 31 and the third installation space 34 of the cylinder body 30 so as to connect them, and the third installation space 34 and the cylinder body 30 A second oil discharge passage 38 is formed between the other ends of the c) to connect the third installation space 34 and the oil tank 62.

On the other hand, the flow path guide block 42 is coupled to the inside of the operating space 31 of the cylinder body 30, and the flow path guide block 42 surrounds the flow path guide block 42 and the cylinder body 30 corresponding thereto. Between the inner circumferential surface of the pressure passage 43 is formed a relatively narrow passage. Since the cross-sectional area of the passage is relatively narrow, the pressure passage 43 increases the pumping pressure and the flow rate when the pumped oil passes through the pressure passage 43 even though the pumping amount of the oil is not large. It becomes possible to pressurize 61 quickly with a large force.

In addition, since the pressurizing flow path 43 is formed over the entire circumference of the flow path guide block 42, the pressurizing range is widened by that much. Therefore, since the pumped oil spreads relatively wide as it passes through the pressurizing flow path 43, not only the local part of the piston 61 is pressed but also the large area of the piston 61 is pressed. 50 to be smoothly transported within the operating space (31).

The piston 61 is installed to be transported along this in the working space 31 of the cylinder 50, as shown in Figures 1 to 4 serves to transport the die head 20. The fixed cap 41 is fixed to one side of the piston 61, and the extension part 22 of the die head 20 to be described above is coupled to the fixed cap 41. Therefore, when the piston 61 is reciprocated in the working space 31 of the cylinder 50, the die head 20 is also conveyed with it.

As such, the extension part 22 of the die head 20 and the piston 61 are coupled by the fixing cap 41, but the extension part 22 of the die head 20 is the piston 61 without the fixing cap 41. It is also possible to configure the configuration directly fixed to one side of the. For example, a male screw portion may be formed at one end of the extension portion 22 of the die head 20, and a female screw portion may be formed on one surface of the piston 61 corresponding to the male screw portion so as to be directly coupled thereto, and vice versa. A female screw portion may be formed on one inner circumferential surface of the extension portion 22 of the die head 20, and a male screw portion protruding may be formed on one surface of the piston 61 corresponding to the female screw portion.

As shown in FIGS. 1 to 4, the oil tank 62 may include a first oil supply passage 35, a second oil supply passage 36, and a first oil discharge passage 37 of the cylinder 50. It is connected to the second oil discharge passage 38 to supply the stored oil to the working space 31 side of the cylinder 50 or to recover and store the oil in the working space 31.

The pumping means 100 is installed in the cylinder 50 as shown in Figs. 1 to 4 and is operated by the oil tank 62 by the first oil supply passage 35 and the second oil supply passage 36. It is connected to the space 31 and pumps the oil in the oil tank 62 to the working space 31 side of the cylinder 50. The pumping means 100 is composed of a drive unit 70, a power converter 80 and a pumping unit 90.

The driving unit 70 transmits power to the pumping means 100 and is connected to the control unit 160 to be described later, thereby controlling the high speed rotation of the motor 71 and the motor 71 connected thereto. It consists of a reducer 72 which slows down at low speed.

The power converter 80 is composed of a cam assembly as clearly shown in FIGS. 3 and 7, which is coupled around the inlet cylinder 50 of the first installation space 32 and is located therein. A cam housing 81 having a storage space 81 a, a cam cover 82 coupled to an open portion of the cam housing 81, and a reducer 72 connected to the cam housing 82 to be rotated along the cam housing 81. Cam bearing 83 consisting of a cam 85 provided around the rotary shaft 84 and the rotary shaft 84, and a support bearing 86 provided between the cam cover 82 and the rotary shaft 84 to support the rotary shaft 84 ), And a working bearing 87 coupled to the cam 85 and rotated with the cam 85 while being reciprocated by its eccentric distance.

The pumping unit 90 includes a plunger 91, a plunger post 92, a spring cap 93, and a plunger spring 94.

The plunger 91 of the pumping part 90 is located in the first installation space 32 of the cylinder and has one end in contact with the actuating bearing 87 to perform a linear reciprocating motion when the cam shaft 83 rotates. The plunger 91 is a base portion 91a which is in contact with the actuating bearing 87 and a lift portion 91b above the base portion 91a and an upper portion of the flange portion 91c and the plunger upper portion of the flange portion 91c. It consists of an assist (plunger assister) 91d, the coupling groove (91e) is formed on the periphery between the upper portion of the elevating portion (91b) and the flange (91c) to be coupled to the spring cap 93 to be described later.

The plunger post 92 of the pumping part 90 is inserted through the center thereof so that the lifting part 91b of the plunger 91 slides therein, and the male screw part 92a is formed around the outer circumferential surface thereof, so It is fastened to the first female screw part 32a formed at the inlet of the installation space 32.

The spring cap 93 of the pumping part 90 is coupled to the engaging groove 91e of the plunger 91 so as to be lifted with the plunger 91 at the same time. In contact with the inner circumferential surface is to slide along this, the bottom surface is formed with an oil hole (93a) so that the oil pumped from the oil tank 62 to the working space 31 side of the cylinder 50 passes.

The plunger spring 94 of the pumping part 90 is installed between the inner side of the first installation space 32 and the spring cap 93 to operate the flange 91c of the plunger 91 to operate the power converter 80. It is elastically supported toward the bearing 87 side, thereby keeping the base 91a of the plunger 91 and the actuating bearing 87 always in contact.

On the other hand, the oil supply valve 110 and the suction valve 120 which serves as a check valve is further installed.

The oil supply valve 110 is connected to the first oil supply passage 35 of the cylinder 50 as shown in FIGS. 1 to 4 and extracted from FIG. 8, and the oil being pumped is oil tank 62. ) To be supplied only to the working space 31 side of the cylinder 50, and to prevent backflow in the reverse direction.

The oil supply valve 110 includes a multi base 111, a spring casing 112, a ball push 113, a steel ball 114 and a ball spring. 115) and a strainer 116;

The multi-base 111 has a male screw portion 111a formed on an outer circumferential surface thereof at one end thereof, and is fastened to the female screw portion 35a of the first oil supply passage 35 so as to penetrate the inside thereof. The inner space penetrated sequentially forms an inlet 111b, a bottleneck 111c, and a supply 111d, and one end of the supply 111d is coupled to the first oil supply passage 35, and an inlet 111b. The other end is located in the oil tank 62.

The spring casing 112 penetrates inside and is fixed in the supply part 111d of the multi base 111.

The ball push 113 is installed so as to penetrate the inside and face the spring casing 112 and slide along it in the supply portion 111d of the multi-base 111.

The steel ball 114 is provided between the bottle push portion 111c of the ball push 113 and the multi-base 111, the oil tank 62 is dropped from the bottleneck portion 111c when the plunger 91 is raised. The oil inside is supplied to the first installation space 32, and when the plunger 91 is lowered, the bottleneck 111c is sealed to prevent the oil in the first installation space 32 from flowing back to the oil tank 62. do.

The ball spring 115 is provided between the spring casing 112 and the ball push 113 to elastically support the ball push 113 and the steel ball 114 to the bottleneck 111c side.

The strainer 116 is installed in the inlet 111b of the multibase 111 to filter foreign matter in the oil passing therethrough.

Herein, the magnet pin 117 may be further installed inside the strainer 116. In this case, the oil in the oil tank 62 passes through the circumference of the magnet pin 117, and thus the supply part 111d of the oil supply valve 110 is provided. The foreign material of the magnetic material contained in the oil is stuck to the magnet pin 117 while being pumped to the) side, so that the oil is more reliably filtered.

Intake valve 120 is installed in the second installation space 33, so that the pumped oil is supplied only to the working space 31 side from the second oil supply passage 36, and to prevent the reverse flow in the reverse direction do.

The suction valve 120 has a check body 121 formed therein with a male screw portion 121a formed therein so as to be fastened to the second female screw portion 33a of the second installation space 33. A ball casing coupled to the check body 121 and penetrating therein to have a bottleneck 122a, the bottleneck 122a being connected to a second oil supply passage 36 of the cylinder 50; 122 is provided between the ball push 123 and the ball push 123 which is installed to penetrate the inside and slide inside the check body 121 and the ball casing 122, A steel ball 124 for opening and closing the bottleneck 122a and the check body 121 and the ball push 123 is installed between the ball push 123 and the steel ball 124 to the bottleneck 122a. It is made of a ball spring (125) elastically supported to the side.

The return means 150 is installed in the cylinder 50 and connected to the operating space 31 and the oil tank 62 by the first oil discharge passage 37 and the second oil discharge passage 38. 31) to recover the oil in the oil tank 62 side. The return means 150 is divided into a piston spring (130) and a relief valve (relief valve) (140).

The piston spring 130 is installed in the working space 31 of the cylinder 50 and restores the piston 61 transferred by hydraulic pressure when the pumping means 100 is stopped. Referring to the role of the piston spring 130 in more detail as follows.

When the pumping means 100 is operated to reach the maximum pressure at which the hydraulic pressure in the cylinder 50 is set, the driving of the motor 71 is stopped by the controller 160 to be described later to release the hydraulic pressure in the cylinder 50. . As such, when the hydraulic pressure in the cylinder 50 is released, the piston spring 130 in the compressed state is restored and the advanced piston 61 is returned to the initial state. Accordingly, the operating space 31 of the cylinder 50 is restored. The oil inside is recovered to the oil tank 62 via the pressurized oil passage 43, the first oil discharge passage 37, the relief valve 140, and the second oil discharge passage 38.

As such, when the rotation of the motor 71 is stopped by the controller 160, the reverse of the die head 20 is automatically performed by the restoring force of the piston spring 130, and at the same time as the end of the machining operation, the die head 20 is finished. Since the reverse conveyance operation of) takes place automatically, the work of separating the work piece 1 from the hydraulic tool can be very convenient.

2 and 4, the relief valve 140 is installed in the third installation space 34 of the cylinder 50 and is connected to the first oil discharge passage 37 and the second oil discharge passage 38. When the piston spring 130 is restored, the first oil discharge passage 37 and the second oil discharge passage 38 are connected to recover oil in the working space 31 to the oil tank 62.

The relief valve 140 has a relief face 141, a valve post 142, a relief load 143, a slider 144, and a relief spring 145. Is done.

The relief face 141 is installed in the lower portion of the third installation space 34 and has an inflow hole 141a formed at the lower end thereof so as to be connected to the first oil discharge passage 37. The through hole 141b is formed at the center of the third installation space 34 so as to be connected. Therefore, the oil in the working space 31 of the cylinder body 30 is the first oil discharge passage 37, the inlet hole 141a of the relief face 141, the through hole 141b, the third installation space 34, The second oil discharge passage 38 is sequentially returned to the oil tank 62.

The valve post 142 is installed in the third installation space 34 and installed to reciprocate along it, and a support flange 142a is formed at one end thereof, and a relief face is formed at the bottom of the support flange 142a. A cock 142b is formed to open and close the through hole 141b of 141.

The relief rod 143 has a male screw portion 143a formed around the outer circumference thereof so as to be fastened to the third female screw portion 34a of the third installation space 34, and a central portion thereof is penetrated therethrough. The valve post 142 described above is inserted to slide.

The slider 144 is installed to slide in the third installation space 34 between the relief face 141 and the relief rod 143, and is supported by the support flange 142a at the bottom thereof when the valve post 142 is raised. It is conveyed with it.

The relief spring 145 is provided between the relief rod 143 and the slider 144 to elastically support the slider 144 toward the support flange 91c side of the valve post 142, and thus the valve post 142. ) Cock 142b is in close contact with the through hole 141b of the relief face 141.

The control unit 160 is connected to the motor 71 as shown in FIG. 1 and the return means 150 when the fixed pressure of the workpiece 1 by the clamp 10 and the die head 20 reaches the set pressure. ) Is supposed to work. That is, when the hydraulic pressure inside the cylinder 50 reaches the set maximum pressure, the motor 71 is stopped so that the relief valve 140 is opened while the piston spring 130 in the compressed state is restored.

The control unit 160 for performing such a role is largely divided into a circuit board 161, a battery 162, and an on / off switch 163.

The circuit board 161 is connected to the motor 71 and has a built-in program for controlling the motor 71. For example, when the internal pressure of the cylinder 50 reaches up to 700 bar, the internal pressure of the cylinder 50 is released so that the workpiece 1 held by the clamp 10 and the die head 20 is released therefrom. In this case, when the internal pressure of the cylinder 50 is gradually increased by the pumping means 100 to reach 700 bar, the motor 71 may be programmed to stop.

When the internal pressure of the cylinder 50 reaches 700 bar and the motor 71 is stopped by a program input to the circuit board, the piston 61 is returned by the restoring force of the compressed piston spring 130, and thus the cylinder The oil in the operating space 31 of the 50 is pressurized oil passage 43, the first oil discharge passage 37, the inlet hole 141a, the through hole 141b, the third installation space 34, the second oil It is recovered to the oil tank 62 through the discharge passage 38, and the work 1 is released from the clamp 10 and the die head 20 while the die head 20 is returned while oil is recovered.

The battery 162 is connected to the circuit board 161 and the motor 71 to supply power to them. The on / off switch 163 is connected between the battery 162 and the motor 71 and controlled by the circuit board 161 to control the driving of the motor 71.

When the driving of the motor 71 is controlled by the control unit 160, the hydraulic pressure is released from the cylinder 50 and the return of the die head 20 is automatically performed by the restoring force of the piston spring 130. Therefore, since the reverse conveyance of the die head 20 is automatically performed at the same time as the end of the machining operation, the work of separating the workpiece 1 from the hydraulic tool can be very convenient.

10 to 12 are side cross-sectional views sequentially showing a state in which the pumping means 100 is actuated to compress the piston 61, and FIGS. 13 and 14 show that the driving of the motor 71 is stopped and thus the cylinder 50 is stopped. As a plan sectional view showing a state in which oil is recovered to the oil tank 62 and a partially enlarged plan sectional view, the operation of the present spring type automatic return hydraulic tool will be described with reference to the following.

First, when power is applied to the controller 160 and the on / off switch 163 is turned on, the motor 71 constituting the driving unit 70 of the pumping means 100 and the reducer 72 connected thereto are driven. Accordingly, while the power converter 80 connected to the speed reducer 72 and the pumping unit 90 connected to the power converter 80 are operated, the oil in the oil tank 62 is operated in the operating space 31 of the cylinder 50. ) Pumping to the inside, which will be described in detail below.

When the rotation shaft 84 of the power conversion unit 80 connected to the reducer 72 is rotated, the cam 85 coupled to the circumference and the operation bearing 87 coupled around the cam 85 rotate with it. The actuating bearing 87 is raised by the eccentric width of the cam 85.

10 is an enlarged cross-sectional view showing a state in which the actuating bearing 87 is raised to the maximum by the rotation of the camshaft 83. When the actuating bearing 87 is raised by the motor 71, the reduction gear 72, and the cam shaft 83, the plunger 91 in contact with the spring cap 93 coupled to the plunger 91 is With this, the plunger spring 94 is compressed.

Here, a space is secured between the spring cap 93 and the plunger post 92 by the rising width of the plunger 91, and the oil of the oil tank 62 is sucked into the secured space. When the plunger 91 is raised to secure the space, the principle of inhaling oil into the secured space can be clearly understood through the principle of the syringe. That is, when the cylinder inlet of the syringe is immersed in the liquid and the piston of the syringe is pulled, a space is secured between the end of the piston and the inner surface of the cylinder, and the liquid is sucked into the secured space.

When the oil flows into the first installation space 32 in which the oil of the oil tank 62 is secured by the above principle, it will be described in detail.

The first installation space 32 is connected to the first oil supply passage 35 and the second oil supply passage 36, and the oil supply valve 110 is connected to the first oil supply passage 35. The suction valve 120 is connected to the second oil supply passage 36. Here, the oil supply valve 110 and the suction valve 120 function as a check valve in the configuration, the oil in the oil tank 62, the oil supply valve 110, the first oil supply passage 35, the first When pumped to be supplied to the working space 31 of the cylinder 50 through the installation space 32, the second oil supply passage 36, the suction valve 120, the pressure passage 43, the oil supply valve 110 ) And the intake valve 120 are opened but remain closed when pumped to flow in the opposite direction.

When the plunger 91 and the spring cap 93 are raised and a space is secured between the spring cap 93 and the plunger post 92, the first oil supply passage 35 and the second oil supply passage 36 are secured. The suction force is generated toward the first installation space 32. Therefore, the first oil supply passage 35 while the steel ball 114 of the oil supply valve 110 compresses the ball push 113 and the ball spring 115 by the suction force acting on the first oil supply passage 35. The bottleneck 111c of the multibase 111 is opened while being sucked to the side.

Therefore, the oil in the oil tank 62 is first passed through the inlet 111b, the bottleneck 111c, and the supply 111d of the multibase 111 by the suction force acting on the first oil supply passage 35. It is sucked into the oil supply passage (35). Here, while the oil in the oil tank 62 is sucked into the inlet 111b of the multi-base 111, foreign substances contained in the oil are filtered through the strainer 116 and around the magnet pin 117, and in particular, the magnetic material. Foreign matters are attached to the magnet pin 117, so that the oil supplied to the working space 31 side of the cylinder 50 is reliably filtered.

The oil introduced into the first oil supply passage 35 flows into the first installation space 32 secured through the oil hole 93a of the spring cap 93.

On the other hand, when the space between the spring cap 93 and the plunger post 92 is secured as the plunger 91 and the spring cap 93 are raised, suction force is generated in the second oil supply passage 36, but suction is caused by the suction force. Since the steel ball 124 of the valve 120 is pulled toward the bottleneck portion 122a of the ball casing 122, the suction valve 120 is not opened.

As the cam shaft 83 continuously rotated by the motor 71 and the reducer 72 is rotated 180 °, the cam 85 and the operating bearing 87 are raised to raise the plunger 91 and the spring cap 93. As it rises, the oil of the oil tank 62 is sucked into the secured first installation space 32.

When the camshaft 83 is continuously rotated and rotated 360 °, the flange 91c of the plunger 91 is pushed downward by the restoring force of the compressed plunger spring 94, whereby the flange 91c is the spring cap 93. Close to the bottom of the while descending with this. As the spring cap 93 descends, the oil introduced into the first installation space 32 receives the pumping pressure, and the pumping pressure acts on the second oil supply passage 36 while the steel ball of the suction valve 120 124 is pushed, and thus the bottle pusher 122a of the suction valve 120 is opened while the ball push 123 and the ball spring 125 are compressed. Therefore, the oil in the first installation space 32 is supplied to the pressure passage 43 through the second oil supply passage 36, the suction valve 120.

In this case, since the cross-sectional area of the pressurizing flow path 43 is formed by the auxiliary space 39 of the cylinder 50 and the flow path guide block 42 installed therein, the oil to be pumped even though the pumping pressure and the pumping amount of the oil are not large. When passing through the narrow pressurizing flow path 43, the pumping pressure and the flow rate is increased, and thus it is possible to quickly pressurize the piston 61 with a large force. Since the pressurizing flow path 43 is formed over the entire circumference of the flow path guide block 42, the pressurizing range is widened by that, and thus, a large area of the piston 61 can be simultaneously pressed.

As the plunger 91 of the pumping unit 90 is repeatedly lifted by the driving unit 70 and the power conversion unit 80 of the pumping means 100, the oil in the oil tank 62 is discharged from the cylinder 50. The pump 1 is continuously pumped to the working space 31, and the die 1 is advanced while the workpiece 1 is gripped by the clamp 10 and the die head 20 while being pumped.

Even when the workpiece 1 is gripped by the clamp 10 and the die head 20, the oil flows to the working space 31 side of the cylinder 50 until the set pressure input to the circuit board 161 of the controller 160 is reached. This pumping continues, and as shown in FIG. 12, the piston spring 130 reaches the set pressure value when it is compressed to the maximum, and this is the time when the cutting work or the work of the work is completed.

As described above, when the oil continues to be pumped into the cylinder 50 and the hydraulic pressure in the cylinder reaches the set pressure value programmed in the controller 160, the driving of the motor 71 is automatically stopped by the controller 160. do. When the motor 71 is stopped, oil is no longer pumped to the working space 31 side of the cylinder 50. As the pumping pressure is released, the restoring force of the compressed piston spring 130 acts on the piston 61. do.

The piston 61 is gradually returned as the relief valve 140 is opened as shown in FIG. 13 by the restoring force of the piston spring 130. With reference to FIG. 14 which is an enlarged view of FIG. 13, the automatic return of the piston 61 is performed. The explanation is as follows.

When the piston 61 is pressurized toward the oil tank 62 by the restoring force of the piston spring 130, the oil in the working space 31 passes through the pressure passage 43 and the suction valve 120 and the first oil discharge passage 37. At this time, the suction valve 120 is a check valve so that the oil flows only from the second oil supply passage 36 to the pressurizing passage 43, as described above, and thus the pressurizing passage 43 in the operating space 31. The oil pressurized to the side) is transferred only to the first oil discharge passage 37.

The oil pressurized toward the first oil discharge passage 37 is pressurized into the through hole 141b through the inlet hole 141a of the relief face 141, and the cock pressure 142b is pushed upward by the oil pressure to raise the valve post. 142 is raised, and the oil transferred to the third installation space 34 between the relief face 141 and the slider 144 is recovered to the oil tank 62 through the second oil discharge passage 38. .

In this way, the oil in the cylinder 50 is recovered to the oil tank 62 through the pressurized oil passage 43, the first oil discharge passage 37, the third installation space 34, and the second oil discharge passage 38. The valve post 142 and the slider 144 maintain the raised state to compress the relief spring 145 during the operation. To satisfy this condition, the elastic force of the piston spring 130 should be greater than the elastic force of the relief spring 145.

Here, the present invention can adjust the recovery time and recovery speed of the oil recovered to the oil tank 62 side in the working space (31). That is, by rotating the relief 143 to the left or right to raise or lower it, the elastic restoring force of the relief spring 145 is reduced or increased, and thus the recovery time and the recovery speed of the oil can be controlled by the increased elastic restoring force.

When the piston 61 is completely returned by the restoring force of the piston spring 130, the pressing force of the oil acting on the pressure passage 43 and the first oil discharge passage 37 is released, and the compressed relief spring 145 is released. The slider 144 and the valve post 142 are restored while being restored, and the cock 142b of the valve post 142 seals the through hole 141b of the relief face 141.

According to the present invention as described above, when the on / off switch is turned on, the work is gripped at a proper pressure between the clamp and the die head while the die head is transferred while the motor is driven, so that the work can be easily and reliably gripped.

In addition, when the motor is driven, the driving unit, the power conversion unit and the pumping unit of the pumping means are operated so that the oil in the oil tank is operated by the oil supply valve, the first oil supply passage, the pumping unit, the second oil supply passage and the suction valve. As the pump is pumped into the space, the piston moves the die head while compressing the piston spring as the pumping means continue to be gripped by the workpiece.Oil is pumped into the cylinder and the hydraulic pressure in the cylinder reaches the set pressure. By the driving of the motor is automatically stopped by the hydraulic pressure in the cylinder is automatically released, the excessive load is not applied to the motor, the reducer and the pumping means to prevent component damage.

When the motor is stopped and the hydraulic pressure in the cylinder is released, the piston is returned by the restoring force of the piston spring. Accordingly, the oil in the working space is automatically transferred to the oil tank through the first oil discharge passage, the relief valve and the second oil discharge passage. At this time, since the die head is separated from the workpiece while being transported together with the piston, the die head is automatically returned at the same time as the machining operation of the workpiece is completed, so that the work is separated from the hydraulic tool very conveniently. can do.

Claims (15)

A clamp 10 to which the work piece 1 is fixed; A die head 20 installed to guide the clamp 10 to fix the workpiece 1 on the clamp 10; One end is fixed to the clamp 10, an operating space 31 is formed therein, and one end of the die head 20 is inserted therein, and a plurality of oil supply passages and oil discharges are inserted into the operating space 31. A cylinder 50 formed to connect passages; A piston (61) installed in the operating space (31) of the cylinder (50) to be transported along this to transfer the die head (20); The oil stored in connection with the oil supply passages and the oil discharge passages of the cylinder 50 is supplied to the operating space 31 side of the cylinder 50 or the oil in the operating space 31 of the cylinder 50 is supplied. An oil tank 62 for recovering and storing the oil tank 62; Is installed in the cylinder 50, it is connected to the oil tank 62 and the working space 31 by the oil supply passages and the oil in the oil tank 62 operating space 31 of the cylinder 50 Pumping means (100) for pumping to the side; It is installed in the cylinder 50, is connected to the working space 31 and the oil tank 62 by the oil discharge passages and return to recover the oil in the working space 31 to the oil tank 62 side Means 150; The control unit 160 is connected to the motor 71 and operates the return means 150 when the fixed pressure of the workpiece 1 by the clamp 10 and the die head 20 reaches a set pressure. Spring type automatic return hydraulic tool, characterized in that consisting of. The method of claim 1, wherein the cylinder 50, The second installation space 33 is formed between the first installation space 32, the pumping means 100 is installed, the operating space 31 and the first installation space 32 and connected to the operating space 31 ), A first oil connecting the third installation space 34 located between the first installation space 32 and the oil tank 62, and the first installation space 32 and the oil tank 62. The second oil supply passage 36 connecting the supply passage 35, the first installation space 32 and the second installation space 33, the operation space 31 and the third installation space 34. A cylinder body 30 having a first oil discharge passage 37 for connecting the second oil discharge passage 37 and a second oil discharge passage 38 for connecting the third installation space 34 and the oil tank 62; Spring-type automatic return hydraulic tool, characterized in that consisting of a cylinder cover 40 coupled to the cylinder body 30 to open and close one side of the working space (31). According to claim 2, Inside the working space 31 of the cylinder 50, The auxiliary space 39 is formed smaller than the working space 31, the flow path guide block 42 is coupled to the central portion of the auxiliary space, the flow path guide block (42) by the flow path guide block ( 42) Spring type automatic return hydraulic tool characterized in that the pressure passage 43 for connecting the second installation space and the operating space 31 is further formed between the periphery and the inner peripheral surface of the auxiliary space 39 corresponding thereto. . The method of claim 1 or 2, wherein the pumping means 100, A driving unit 70 for generating rotational power to pump oil in the oil tank 62 into the cylinder 50; A power converter 80 connected to the drive unit 70 to convert rotational power of the drive unit 70 into a reciprocating transfer motion; Pumping is installed in the first installation space 32 of the cylinder 50 and connected to the power conversion unit 80 to pump oil in the oil tank 62 to the working space 31 side of the cylinder 50. Spring type automatic return hydraulic tool, characterized in that consisting of (90). The method of claim 4, wherein the drive unit 70, Motor 71, A spring type automatic return hydraulic tool, characterized in that consisting of a reducer (72) connected to the motor (71) to reduce the high speed rotation of the motor (71) at a low speed. The method of claim 4, wherein the power conversion unit 80, A cam housing 81 coupled to the cylinder 50 and having an accommodation space 81 a formed therein; A cam cover 82 coupled to an open portion of the cam housing 81; A cam shaft 83 formed of a rotation shaft 84 connected to the reduction gear 72 and rotated along the cam shaft 85 and a cam 85 provided around the rotation shaft 84; A support bearing 86 installed between the cam cover 82 and the rotating shaft 84 to support the rotating shaft 84; The spring type automatic return hydraulic tool is coupled to the cam (85) and made of an actuating bearing (87) which is reciprocated as much as its eccentric distance while being rotated with it when the cam (85) rotates. The method of claim 4 or 6, wherein the pumping unit 90, A plunger 91 positioned in the first installation space 32 of the cylinder 50 and having one end contacting the actuating bearing 87 to perform a linear reciprocating motion when the camshaft 83 rotates; Plunger post 92 is fastened to the inlet of the first installation space 32 to guide the transfer of the plunger 91, A spring cap (93) coupled to the other end of the plunger (91) and installed to slide along an inner circumferential surface of the first installation space (32) so that the plunger (91) moves up and down together; Spring type, characterized in that the plunger spring 94 is installed between the inner side of the first installation space 32 and the spring cap 93 to elastically support the plunger 91 to the operation bearing 87 side Auto return hydraulic tool. According to claim 2, In the first oil supply passage 35 of the cylinder 50, It is characterized in that the oil supply valve 110 is further provided so that the pumped oil is supplied only from the oil tank 62 to the working space 31 side of the cylinder 50 and prevented from flowing in the reverse direction. Spring automatic return hydraulic tool. The method of claim 8, wherein the oil supply valve 110, The inside penetrates through the inner space sequentially forming an inflow portion 111b, a bottleneck portion 111c and a supply portion 111d, and one end of the supply portion 111d is coupled to the first oil supply passage 35. The multi-base 111 and the other end of the inlet 111b side is located in the oil tank 62, A spring casing 112 which is penetrated inside and fixed in the supply part 111d of the multi-base 111; A ball push 113 penetrated inside and opposed to the spring casing 112 and installed to slide along the feed portion 111d of the multi-base 111; A steel ball 114 provided between the ball push portion 113 and the bottleneck portion 111c of the multi-base 111 to open and close the bottleneck portion 111c, A ball spring 115 installed between the spring casing 112 and the ball push 113 to elastically support the ball push 113 and the steel ball 114 toward the bottleneck 111c, Spring-type automatic return hydraulic tool, characterized in that consisting of a strainer 116 is installed in the inlet (111b) of the multi-base 111 to filter the foreign matter in the oil passing therethrough. The method of claim 9, wherein the strainer 116, Spring type automatic return hydraulic tool, characterized in that the magnet pin 117 is further provided so that foreign substances of the magnetic material contained in the oil is filtered. According to claim 2, In the second installation space 33, Spring type automatic return, characterized in that the inlet valve 120 is further installed to prevent the pumped oil is supplied only to the working space 31 side in the second oil supply passage 36 and the reverse flow in the reverse direction Hydraulic tools. The method of claim 11, wherein the suction valve 120, Check body 121 is penetrated inside and coupled to the second installation space 33, Ball casing 122 coupled to the check body 121 and penetrated so as to have a bottleneck 122a therein, and the bottleneck 122a is connected to the second oil supply passage 36 of the cylinder 50. , A ball push 123 which is penetrated inside and slides inside the check body 121 and the ball casing 122; A steel ball 124 provided between the ball pusher 123 and the ball casing 122 to open and close the bottleneck 122a; The ball spring 125 is installed between the check body 121 and the ball push 123 to elastically support the ball push 123 and the steel ball 124 toward the bottleneck portion 122a. Spring automatic return hydraulic tool. The method of claim 1 or 2, wherein the return means 150, A piston spring 130 installed in the working space 31 of the cylinder 50 and restoring the piston 61 transferred by hydraulic pressure when the pumping means 100 is stopped; It is installed in the third installation space 34 of the cylinder 50 and connected to the first oil discharge passage 37 and the second oil discharge passage 38 and while the piston spring 130 is restored, the first Spring type, characterized in that consisting of a relief valve 140 to connect the oil discharge passage 37 and the second oil discharge passage 38 to recover the oil in the working space 31 to the oil tank 62. Auto return hydraulic tool. The method of claim 13, wherein the relief valve 140, A relief face 141 installed in the third installation space 34 and having a through hole 141b formed to be connected to the first oil discharge passage 37; The valve post 142 is installed therein so as to be transported along the inside of the third installation space 34, and a cock 142b is formed at one end opposite to the opening and closing of the through hole 141b of the relief face 141. Wow, A relief rod 143 coupled to the third installation space 34 and guiding the transfer of the valve post 142; Slider 144 is installed so as to slide in the third installation space 34 between the relief face 141 and the relief rod 143 and conveyed with it when the valve post 142 is transferred, Spring-type automatic return hydraulic tool, characterized in that consisting of a relief spring 145 is installed between the relief 143 and the slider 144 to elastically support the slider 144 toward the relief face 141 side. . The method of claim 1, wherein the controller 160, When the hydraulic pressure inside the cylinder 50 reaches the set pressure, the piston spring 130 in the compressed state is restored and the relief valve 140 is opened so that the work 1 is fixed and processed. Spring automatic return hydraulic tool, characterized in that configured to stop the motor at the end of this time.

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