KR100298313B1 - Pressure oil wrench - Google Patents

Abstract

The present invention, when tightening the bolts and nuts at first, fast tightening with a small force at the beginning and the last tightening itself to detect the time, but tightened with a slow but large force, as well as immediately notify the completion state or stop the operation by itself As a result, it relates to a hydraulic wrench that prevents damage to or damage to bolts and nuts as well as wrenches.

The constitution includes a main body 10 having a cavity inside, a high pressure pump 20 having a smaller internal volume which is symmetrically placed on both sides of the main body, a low pressure pump 30 having a larger internal volume than the high pressure pump, The flow passage 321 is formed to penetrate the piston 32 of the low pressure pump back and forth and is opened and closed by the ball valve 322, the oil discharged from the high and low pressure pump and the tantalum spring 63 mounted therein. And the wrench cylinder 64 to rotate the wrench socket 64 and the wrench cylinder 60 which tightens the bolt and nut, and is attached to one side of the main body 10 to activate the alarm or the alarm when the tightening of the bolt and nut is completed. Or a safety device 80 for stopping the operation of the high and low pressure pumps.

Description

Hydraulic Wrench

The present invention relates to a hydraulic wrench, and more specifically, when tightening the bolt and nut at first, fast tightening with a small force at the beginning, and when the last tightening itself is sensed by a slow but large force, as well as tightening is completed It relates to a hydraulic wrench that allows you to know immediately.

In general, when tightening the bolt and nut with a wrench, tightening it at a high force and speed from the beginning to the end may cause breakage of the wrench or damage to the bolt and nut. It was necessary to tighten it with a slow and large force from the remaining point, that is, the torque received during the tightening process.

However, the conventional hydraulic wrench does not automatically adjust the tightening force according to the tightening state, because the tightening force is adjusted by the operator's operation, there was a disadvantage that the use is very cumbersome and inconvenient.

In addition, inadvertent tightening force could not be adjusted in a timely manner, as well as the wrench itself, such as damage or breakage of the bolt or nut, there was a closing.

In addition, it is very difficult to immediately detect the state in which the tightening work is completed unless attention is paid when working in a noisy site. Therefore, when the tightening is completed, the operation cannot be stopped immediately, and parts such as various valves in the hydraulic wrench can be stopped. There are many problems in use, such as shortening the life of the children.

The present invention has been invented to solve the above problems of the conventional hydraulic wrench, the object of the present invention is to provide a hydraulic wrench which is very convenient to use, prevents shortening of life and removes damage and breakage.

In addition, another object of the present invention is to provide a hydraulic wrench that allows the operator to immediately know that the tightening is completed.

The above objects are achieved by automatically adjusting the tightening force as well as stopping the hydraulic pump when the tightening is completed, or providing a hydraulic wrench that flashes an alarm light or emits an alarm sound.

In other words, during the initial tightening, the socket with the bolt and nut is quickly rotated with a small force.When the torque is received during tightening, the socket is tightened with a slow and large force afterwards.When the tightening is completed, the hydraulic pump is stopped. Giving or promptly notifying the completion status, so that the operator can quickly take action to prevent damage and breakage of the bolts, nuts, as well as the wrench.

1 is a cross-sectional view showing the configuration of the hydraulic wrench of the present invention

Figure 2a-b is an enlarged cross-sectional view showing the operating state of the wrench socket of the hydraulic wrench.

Figure 3a-c is an enlarged cross-sectional view showing the operating state of the safety device of the hydraulic wrench.

Explanation of symbols for the main parts of the drawings

(10) Body (12) Mixing flow path

(16) outflow path (17) communication path

(20) High Pressure Pumps (21) High Pressure Cylinders

(22) High pressure piston (23) High pressure return spring

(24) High pressure inlet (25) High pressure outlet

(26) (26 ') 1.2 High Pressure Check Valve

(30) Low Pressure Pump (31) Low Pressure Cylinder

(32) Low Pressure Piston (33) Low Pressure Return Spring

(34) Low pressure inlet (35) Low pressure outlet

(36) (36 ') 1.2 low pressure check valve

(40) Cam (60) Wrench Cylinder

(80) Safety Device (81) Valve Room

(82) Safety valve (83) Push spring

(84) cylinder (85) piston

(86) Tantal Springs (87) Safety Sutures

(321) Channel (322) Ball Valve

(323) spring

Hereinafter, the configuration and operation of the present invention in detail based on the accompanying drawings.

Reference numeral 10 denotes a main body of a hydraulic pump having a cavity inside, and the high pressure pump 20 and the low pressure pump 30 are symmetrically arranged on the same line from side to side.

The high pressure pump includes a high pressure cylinder 21 having a low internal volume, a high pressure piston 21 coupled through an open inner end of the cylinder, and a high pressure return spring 23 that causes the piston to be shot and retracted. And 1.2 high pressure check valves 26 and 26 'mounted to open and close the high pressure suction port 24 and the high pressure discharge port 25 of the cylinder, respectively.

In addition, the low pressure pump has a low pressure cylinder 31 whose internal volume is larger than that of the high pressure cylinder, and a low pressure is generated, a low pressure piston 32 coupled through the open inner end of the cylinder, and which causes the piston to be shot back. The low pressure return spring 33 and the low pressure suction opening 34 and the low pressure discharge port 35 of the cylinder is composed of 1.2 low pressure check valves (36, 36 ') which are mounted to open and close, respectively.

A cam 40 rotated by a motor is installed between the inner end surfaces of the pistons 22 and 32, and both outer peripheral surfaces of the cams come into contact with inner end surfaces of the high and low pressure pistons, respectively.

Accordingly, the pistons 22 and 32 are alternately reciprocated by the rotation of the cam and the elastic force of the return springs 23 and 33.

On the other hand, each of the inlet 24, 34 of the high and low pressure pumps are connected to the oil tank 50 through the respective high and low pressure suction pipe (11, 11 ').

In addition, the discharge ports 25 and 35 of the high and low pressure pumps are connected to the mixing passage 12 formed in the main body 10, and the middle of the mixing passage and the inlet 61 of the wrench cylinder 60 are connected to the supply pipe. It is connected to (13), the outlet 61 'of the wrench cylinder is connected to the oil tank 40 by the discharge pipe (14).

Therefore, when the cam 40 is rotated, the high and low pressure pistons 22 and 32 are alternately moved forward and backward by the action of the cam and the respective return springs 23 and 33, so that the high and low pressure pump 20 (30) alternately performs the suction and discharge operation of the oil.

That is, when the cam pushes the high pressure piston 22 in accordance with the rotation of the cam 40, the piston is advanced so that the return spring 23 is compressed, and a compression force is generated in the cylinder 21, so that the first spring is pushed. The high pressure check valve 26 attaches the inlet 24, and the second high pressure check valve 26 ′ opens the discharge port 25.

In this case, the oil in the cylinder 21 is discharged to the mixing flow path 12 through the discharge port 25 by the compressive force.

When the high pressure pump 20 discharges in this manner, the cam 40 does not push the low pressure piston 32, so the low pressure piston is retracted by the repulsive force of the return spring 33, and thus the low pressure cylinder. A suction force is generated in 31.

In this case, since the first low pressure check valve 36 opens the suction port 34 and the second low pressure check valve 36 'closes the discharge port 35, the oil in the oil tank 50 has a low pressure cylinder ( 31 is sucked into the low pressure cylinder through the suction pipe 11 'and the open suction port 34 by the suction force in the 31).

Then, when the cam 40, which is continuously rotating, pushes the low pressure piston 32 forward, and the high pressure piston 22 is not pushed, the high pressure piston is compressed by the elastic force of the return spring 23 compressed. Since it is reversed, a suction force is generated in the high pressure cylinder 21 at this time, and a compression force is generated in the low pressure cylinder 31.

Therefore, the check valve 26 is moved by the suction force of the high-pressure cylinder 21 to open the suction port 24, and the check valve 26 'closes the discharge port 25, so that the oil tank 50 is operated by the suction force. The oil in) is sucked into the high pressure cylinder through the suction pipe 11 and the open suction port 24.

However, on the contrary, the check valve 36 of the low pressure cylinder 31 is moved by the compressive force to close the suction port 34, and the check valve 36 ′ opens the discharge port 35 so that the oil in the low pressure cylinder is discharged ( 35 is discharged to the mixing flow path 12 side.

In this way, since the high and low pressure pumps 20 and 30 perform the suction and discharge operations one by one in turn with each rotation of the cam 40, the suction and discharge operations are repeated if the cam continues to rotate. Thus, the oil in the oil tank 50 is pumped by the high and low pressure pumps and intermittently flows into the mixing passage 12.

Thus, when oil flows into the mixing passage 12, the oil is supplied into the wrench cylinder 60 via the supply pipe 13 and the inlet 61 connected to the mixing passage.

The oil supplied in this way pushes the wrench piston 62 mounted in the wrench cylinder in such a way as to be retracted by the bullet spring 63 in the wrench cylinder.

At this time, since the supply state of the oil supplied into the wrench cylinder is made intermittently, when supplied, the wrench piston 62 is pushed forward, and when it is not supplied, the compressed ball spring that is compressed when the wrench piston is advanced ( Due to the repulsive force of 63), the oil supplied to the wrench cylinder at the time of retraction is discharged through the discharge port 61 'and sent to the oil tank 50 via the discharge pipe 14.

By the way, it is possible that the oil can only be introduced into the inlet 61 and discharged only to the outlet 61 ′ because the solenoid valve 70 is provided on the pipeline of the supply pipe 13 and the discharge pipe 14. This is made possible by the control of the valve.

On the other hand, when the wrench piston 62 is advanced by the oil which flows in, at the tip of the piston rod 62 ', the upper end of the arm of the wrench socket 64 is interlocked and rotated by the interlocking pin 65 so that the shaft is orthogonally rotated. Because of the engagement, the rod is rotated in proportion to the degree of advancement.

When the wrench socket 64 is rotated in this way, the bolt or nut coupled to the socket groove 64 'is rotated and tightened as much as the rotation thereof.

However, when the oil does not flow in, the piston rod 62 'is reversed by the action of the bullet spring 63, so that the wrench socket 64 is rotated in reverse. In this case, the socket groove 64' of the wrench socket Since it is not reversed by the operation of the cheat 65 ', the bolt or nut in the tightened state is not released, and is continuously tightened at every advance of the piston rod 62' according to the inflow of oil.

As a result of the operation of the high and low pressure pumps 20 (30), the bolts and nuts are initially tightened at a low power and a high speed. When the bolts and nuts are tightened at a high speed even when almost all are tightened, the wrench as well as the bolt nut Because of the phenomenon that damage or breakage occurs, the speed is slow at this time, but a large force requires a tightening force.

Therefore, in the present invention, for this purpose, the flow path 321 is formed to pass through the low pressure piston 32 back and forth, and a valve seat is formed in the flow path so that the ball valve 322 is opened and closed by spring 323. It was forever.

That is, when the bolts and nuts are almost all tightened, the tightening force is subjected to torque. If the torque is greater than the compressive force generated in the cylinder 31 when the low pressure piston 32 is advanced, the check valve 36 'is not opened. Therefore, the compressed oil cannot be discharged through the discharge port 35, pushes the ball valve 322, passes through the low pressure piston 32 through the flow path 321, and flows into the main body 10, thereby allowing the inside of the main body to be discharged. It is sent into the oil tank through a pipe (15) connecting the cavity and the oil tank (50).

In this case, the high and low pressure pumps 20 and 30 continue to operate due to the rotation of the cam 40, but the pumping operation of the low pressure pump 30 causes oil to flow out of the main body 10 through the flow passage 321. Because of this, it is in vain.

Accordingly, the tightening force for tightening the bolt and nut is generated by the high pressure pump 20, and since the content of the cylinder 21 of the pump is smaller than that of the cylinder 31 of the low pressure pump 30, it is eventually applied to the low pressure pump. The pressure of the oil pumped by the large but small amount to rotate the wrench socket 64 with a slow and large force, the bolt nut is finally tightened by a very strong force.

When the bolt and nut are completely tightened by this action, the wrench should no longer be operated to prevent damage to the wrench. In the present invention, a safety device 80 is attached to the main body 10 for this purpose. The alarm sound or an alarm to inform, or to stop the operation of the motor to operate the high and low pressure pump (20, 30).

That is, the safety device is a valve chamber 81 formed in one side of the main body 10 to be connected to one side of the mixing passage 12 and the outflow passage 16, and the pressing spring 83 in the valve chamber A safety valve 82 which is forwardly mounted to open and close the outlet passage, a cylinder 84 formed at the other side of the main body 10 so as to be connected to one side of the valve chamber and the communication path 17, and Piston 85 mounted to the communication path side by the ball spring 86 in the cylinder, the safety switch 87 is installed on the outer surface of the main body 10 located on the outer end side of the cylinder, and the communication path The orifice flow path 18 is formed in the main body 10 to connect the discharge pipe 14 and the inner end portion of the cylinder 84 and the discharge pipe 14, and the diameter is larger than the orifice flow path 18. It is formed in the main body 10 and consists of the outflow path 19 which is closed by this piston when the piston 85 is reversed.

Then, the pressure adjusting screw 88 is fastened to the outer end of the valve chamber 81 so that the pressure of the safety valve 82 can be adjusted by adjusting the elastic force of the push spring 83.

In addition, the safety switch 87 may be connected to a general alarm or an alarm lamp (which may be attached to an appropriate part of the main body 10), or may be connected to a motor for rotating the cam 40.

The operation of the safety device 80 is configured as follows.

First, when the bolt and nut coupled to the socket groove portion 64 'is completely tightened and no longer rotated, the pressure of the oil pumped by the high pressure pump 20 is filled in the mixing flow passage 12. When the pressure is greater than the spring force of the spring 83, the safety valve 82 is opened and flows into the valve chamber 81 through the outlet passage 16.

In this way, the oil flowing into the valve chamber 81 is moved to the communication path 17 side and discharged to the discharge pipe 14 through the orifice flow path 18, the discharged amount is extremely because the diameter of the orifice flow path is small Since the oil moved to the communication path 17 side is insignificant, the oil flows into the cylinder 84 without pushing a large pressure difference to push the piston 85.

Therefore, when the piston 85 is advanced, the ball spring 86 is compressed and the piston rod is operated by pressing the safety switch 87. By the operation of this switch, an alarm is generated in the alarm to inform the completion of the tightening operation. In addition, when an alarm lamp is connected, the light blinks, so the operator can take immediate action because the completion status can be known even in a noisy scene or far away.

In addition, when the safety switch is connected to the motor for rotating the cam 40, the operation of the motor is stopped so that the operation of the wrench is automatically stopped.

In this process, the oil flowing into the cylinder 84 flows out when the piston 85 passes the position of the outlet passage 19, that is, when the piston rod operates the safety switch 87. ) Is opened and is discharged to the discharge pipe 14 via this outlet.

In this case, since the operation of the motor is stopped by the operation of the safety switch 87 and the pumping operation of the oil is stopped, no more oil is introduced into the cylinder 84, and thus, the shot of the compressed ball spring 86 is compressed. The piston 85 is reversed to stop the operation of the safety switch.

Thus, the oil which advanced the piston 85 to flow out to the outflow path 19 is for preventing the piston from being excessively advanced and damaging the safety switch 87, and the orifice flow path 18 When the piston 85 is reversed, most of the oil introduced into the cylinder 84 is discharged through the outlet passage 19, but when the piston is reversed to the outlet position, the oil is no longer through this outlet passage. Since the oil does not flow out from the orifice flow path 18 thereafter, the piston 85 can be completely reversed to the original position so that the safety switch 87 is precisely 'on / off'.

The hydraulic wrench of the present invention, which operates in this way, tightens the bolt and nut with a quick and low force in the early stage. However, when the torque is received during the tightening process, it is slow but has a large force. This has the advantage of being very convenient.

In addition, since the tightening force is controlled by the lamp, not only the wrench itself but also the effect of preventing damage or breakage of the bolt and nut can be obtained.

In addition, the safety device quickly informs the bolts and nuts of the full tightening status, so that the operator can immediately take the next action and stop the operation by itself. .

Claims (2)

The hydraulic pressure to tighten the bolt and nut by rotating the wrench socket 64 mounted on the wrench cylinder 60 to the wrench piston 62 which is operated by the hydraulic pump and the forward and backward operation by the ball spring 63. In the wrench, the hydraulic pump comprises a main body 10 having a cavity inside; The high pressure suction port 24 attached to one side of the main body and connected to the oil tank and the high pressure discharge port 25 connected to the mixing passage 12 formed in the main body 10 to be connected to the wrench cylinder 60 are formed. High-pressure cylinder 21 having a low internal volume, high-pressure piston 22 coupled through the open inner end of the cylinder, high-pressure return spring 23 mounted to cause the piston to be shot and reversed, and the high-pressure inlet 24 And a high pressure pump (20) having a 1.2 high pressure check valve (26, 26 ') mounted to open and close the high pressure discharge port (25): the high pressure pump (20) at the other side of the main body (10). And a low pressure suction hole (34) having a lower pressure suction opening (34) connected to the oil tank and a lower pressure discharge hole (35) connected to the mixing flow passage (12), which is separately installed and symmetrically connected to the oil tank. A low pressure piston 32 coupled through the open inner end of the cylinder, and the piece A low pressure return spring 33 mounted to open and close the cylinder, a 1.2 low pressure check valve 36 and 36 'mounted to open and close the low pressure suction port 34 and the low pressure discharge port 35, and the low pressure. And a flow path 321 formed to penetrate the piston 32 back and forth, and a ball valve 322 mounted to the valve seat made in the flow path by spring 323 to open and close the flow path 321. Low pressure pump 30 and: It is installed in the main body 10 located between the high and low pressure pump 20 (30) and rotated by a motor, one outer peripheral surface and the inner end surface of the high pressure piston 22, the other Hydraulic wrench, characterized in that consisting of the cam 40 in contact with the inner end surface of the low pressure piston 32, respectively. According to claim 1, wherein the main body 10 has a valve chamber 81 attached to the main body 10 to be connected to one side of the mixing passage 12 and the outflow passage 16, and the pressing spring in the valve chamber ( 83, a safety valve 82 for opening and closing the outlet passage 16, a cylinder 84 attached to the main body 10 to be connected to the communication passage 17, and a ball spring in the cylinder. Piston 85 is mounted to the rear by the 86 and the outer end side of the cylinder 84 is installed, and when the piston 85 is advanced, it is operated by the rod to operate an alarm or an alarm lamp or a cam ( Hydraulic wrench characterized in that to install a safety device (80) consisting of a safety switch (87) for stopping the operation of the motor to rotate 40.