JPH1183654A - Oil pressure gauge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow light handle operation of a restore mechanism when canceling pressure indication of a pressure gauge which displays it while maximum pressure point is held. SOLUTION: Relating to an oil pressure gauge comprising a pressure gauge 1 comprising a display part 2 and a main body 3 to which the pressure gauge 1 is attached, a first check valve 11 for forming a peak hold of the pressure gauge 1 by blocking an oil-flow from the sensor part 4 toward an oil channel 9 through a pressurized flow channel 10 which communicates with the oil channel 9 is provided between the oil channel 9 and the sensor part 4 of the pressure gauge 1, at the main body 3, meanwhile a valve chamber 12 of the first check valve 11 communicating with a return valve 19 which is opened/closed by an operation of a return mechanism 18 through a first pressure-release flow channel 17, and a second pressure-release flow channel 28 which communicates with the oil channel 9 communicating with a valve chamber 19a of the return valve 19 through a second check valve 29 which blocks oil flow from the oil channel 9 toward the return valve 19, so that the pressure of the oil channel 9 is blocked with the second check valve 29 to discourage its effect on the return mechanism 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic pressure gauge mounted on a hydraulic device, and more particularly, to a hydraulic anchor bolt pull-out strength inspection apparatus used for confirming the pull-out strength of an anchor bolt implemented by an anchoring method. The present invention relates to an oil pressure gauge suitable for the present invention.

[0002]

2. Description of the Related Art As an inspection device for checking the pull-out strength of an anchor bolt conventionally performed by an anchoring method, a small hydraulic device with a good transportability using a pressure gauge so as to facilitate inspection work on site. Is known.

[0003] Fig. 4 shows an example of a hydraulic anchor bolt pull-out strength inspection apparatus, which includes a manual hydraulic pump 40, a pressure gauge 42 provided with a pressure gauge 41 connected in front thereof, and a pressure gauge 42. And a ram portion 44 connected to a connection hose 43 by a connection hose 43.

The ram portion 44 comprises a reaction table 46 comprising a table 45 having legs 45a, a plunger 47 fixed on the reaction table 46, and a ram 48 sliding on the plunger 47.
And a tension bolt 52 that is inserted through an insertion hole provided in the center shaft of the plunger 47 and the ram 48, has a washer 49 and a nut 50 attached to the upper end, and a connection nut 51 is attached to the lower end.

[0005] When performing the anchor test,
3, the reaction force table 46 is installed, the anchor bolt 54 of the execution surface 53 and the tension bolt 52 are connected with the connection nut 51, and the hydraulic pump 40 is operated to operate the ram portion 44.
The washer 49 is pushed up on the upper surface of the ram 48 to pull up the tension bolt 52, and a force is applied to the anchor bolt 54 in the removal direction. The additional pressure due to the hydraulic pressure at this time is read by the pressure gauge 41, and the pull-out durability of the anchor bolt 54 is checked.

FIG. 3 shows a conventional pressure gauge 42 composed of a pressure gauge 41 used in such an inspection device and a main body 63 to which the pressure gauge 41 is attached. In other words, the reverse direction of the free flow of the oil passage 55 through the pressurized flow passage 64 between the oil passage 55 and the sensor unit 56 of the pressure gauge 41 so that the highest pressure point at the time of the test can be held and displayed on the pressure gauge 41. Check valve 57 is provided to prevent the flow of air.

A pressure gauge 4 is provided in a valve chamber 57a of the check valve 57.
A return valve 58 used for canceling the peak hold of 1 (holding the highest pressure point) communicates via a first relief pressure passage 61, and the return valve 58 is connected to a handle 59 of the return mechanism 62.
Is turned to return the return shaft 60 and open the valve.

A second relief pressure passage 65 communicating with the oil passage 55 is directly connected to the valve chamber 58a of the return valve 58. When the return valve 58 is opened, the residual pressure during the peak hold is reduced to the second relief pressure. The peak hold is eliminated by escaping from the pressure passage 65 to the oil passage 55.

The conventional pressure gauge 4 constructed as described above
2, the return valve 58 is closed and the hydraulic pump 40
When the hydraulic pressure is applied to the oil path 55 by operating the oil path 55, the check valve 57 is opened by the free flow of the oil path 55 and the pressure gauge 41 indicates the maximum pressure. 5
7 closes. Therefore, the pressure gauge 41 performs the peak hold, and the displayed maximum pressure can be surely confirmed. By opening the return valve 58, the peak hold is eliminated, and the pressure gauge 41 displays a pressure balanced with the pressure of the oil passage 55.

[0010]

However, in the conventional pressure gauge 42, the maximum oil pressure of the pressure gauge 41 is applied to the shaft 60 of the return mechanism 62 at the time of peak hold, and the pressure gauge 42 communicates with the oil path 55. Two relief pressure channels 65
The structure is designed to receive the hydraulic pressure from directly. Accordingly, the higher the pressure, the greater the force for rotating the handle 59 for returning the return shaft 60, and the worse the handle operability when eliminating peak hold.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to make it possible to operate the handle of the return mechanism lighter than in the past when eliminating the peak hold displayed on the pressure gauge. .

[0012]

According to the present invention, there is provided a hydraulic gauge comprising a pressure gauge having a display section and a main body to which the pressure gauge is mounted; the main body includes an oil passage and a sensor section of the pressure gauge. A first check valve for preventing a flow of oil from the sensor unit in the direction of the oil path through a pressurized flow path that opens to the oil path between the first and the second pressure valves to form a peak hold of the pressure gauge is provided. And a valve chamber of the first check valve communicates with a return valve that opens and closes by operation of a return mechanism via a first relief pressure flow path. A second relief pressure flow path communicating with the first return valve and the return valve is characterized in that the second relief pressure flow path communicates via a second check valve that prevents oil flow from the oil path in the return valve direction. In the peak hold state with the valve closed, the hydraulic pressure flowing from the oil passage to the second Was blocked by the stop valve was not allowed to participate in the return mechanism.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIGS. 1 and 2 show a hydraulic gauge suitable for a hydraulic anchor bolt pull-out strength inspection apparatus of the present invention, in which a pressure gauge 1 having a display section 2 and a pressure gauge 1 are mounted. And a main body 3.

The pressure gauge 1 is a well-known type, and may be of any type such as a Bourdon tube type. In this embodiment, the pressure gauge 1 has a display unit 2 indicated by a scale 2a and a pointer 2b. The sensor section 4 below the section 2 is screwed into the mounting opening 5 of the main body 3 and is attached to the main body 3 in an oil-tight manner via an O-ring 6 for preventing oil leakage and its receiving plate 6a.

As shown in FIG. 2, the main body 3 has a display part 2 of the oil pressure gauge 1 as a front face, and an oil passage 9 communicating with connection hose attachment ports 7, 8 on both sides is perforated. 9
Between the sensor unit 4 and the sensor unit 4 of the pressure gauge 1 through a pressurized flow path 10 of a vertical hole to prevent oil flow from the sensor unit 4 toward the oil path 9 to form a peak hold of the pressure gauge 1. A first check valve 11 is provided.

The first check valve 11 includes a valve seat 13 at an entrance of a valve chamber 12 communicating with the pressurizing passage 10, a ball valve 14 pressed against the valve seat 13, a spring 15 for pressing a valve ball 14,
And a spring support 16 for supporting the spring 15.

The valve chamber 12 of the first check valve 11 is provided with a ball valve 21 which is pressed by a valve seat 19b at the tip of a shaft 20 of a return mechanism 18 through a first relief pressure passage 17 formed in a front lateral hole. Return valve 19 is in communication.

The return mechanism 18 is a device for opening and closing a return valve 19, and is provided with a washer 2 in a mounting hole 22 in front of the main body 3.
Nut 24 to prevent oil leakage screwed in through 3
A shaft 20 which slides inside the nut 24 via an O-ring 25 and which is screwed to the main body 3 at its tip end 26 so as to be able to advance and retreat, and a handle 27 fixed to the base end of the shaft 20. The rotation of the handle 27 moves the shaft 20 forward and backward to open and close the return valve 19.

In the valve chamber 19 a of the return valve 19, a second relief pressure passage 28 communicating perpendicularly to the oil passage 9 is provided with a second reverse pressure block for preventing an oil flow from the oil passage 9 toward the return valve 19. It communicates via a stop valve 29.

The second check valve 29 is connected to a valve seat 31 via a short vertical flow path 30 which opens into a valve chamber 19a of the return valve 19 where the distal end portion 26 of the shaft 20 faces.
3 and a ball valve 34 for stopping oil, which supports a spring 33, and these members 32, 33, 34
The second relief pressure passage 28 is opened on the side of the valve chamber 36 of the second check valve 29.

When using the hydraulic instrument of this embodiment configured as described above, the handle 27 is rotated in the closing direction to advance the shaft 20, and the valve ball 21 is moved to the valve seat 19b.
And the return valve 19 is closed.

When oil is fed from the oil passage 9, the oil flow toward the second relief pressure passage 28 is blocked by the second check valve 29, and the oil flow toward the pressurization passage 10 is reduced to the first flow. The ball valve 14 of the check valve 11 is pushed up to open against the pressure of the spring 15, and the pressure is displayed on the display unit 2 of the pressure gauge 1.

When the pressure in the oil passage 9 drops, the ball valve 14 is pressed against the valve seat 13, the first check valve 11 closes, and the highest pressure generated is displayed on the pressure gauge 1 as a peak hold. You.

Therefore, even if the pressure in the oil passage 9 further decreases,
The maximum pressure is indicated on the display unit 2, and the generated maximum pressure can be visually recognized with certainty.

Next, when the handle 27 of the return mechanism 18 is rotated in the opening direction to retract the shaft 20, the return valve 19
Is released by the holding pressure, and the maximum pressure held by the pressure gauge 1 passes through a circuit including the first relief pressure passage 17, the valve chamber 19 a of the opened return valve 19, and the vertical passage 30. The ball valve 32 is pushed down to open the second check valve 29 and escape from the second relief pressure passage 28 to the oil passage 9. Accordingly, the peak hold of the pressure gauge 1 is eliminated, the pressure of each circuit is balanced with the pressure of the oil passage 9, and the display unit 2 displays the pressure of the oil passage 9.

When the maximum pressure is maintained in the pressure gauge 1, the pressure from the oil passage 9 to the second relief pressure passage 28 is:
The valve chamber 1 of the return valve 19 which is shut off by the second check valve 29
9a, the ball valve 21 of the return valve 19 and the shaft 20 facing the valve chamber 19a are cut off from this hydraulic pressure. Therefore, since the return mechanism 18 does not receive the resistance of the oil pressure of the oil passage 9, the force for turning the handle 27 for returning the shaft 20 and opening the return valve 19 can be reduced, and the return force is smaller than that of the conventional pressure gauge. Operation is easy.

To observe the pressure change in the oil passage 9 without performing the peak hold by the pressure gauge 1, the handle 27 is turned in the opening direction to feed the oil to the oil passage 9 while the return valve 19 is kept open.

Since the oil flow opens the valve seat 13 of the first check valve 11 and the return valve 19 is opened, the valve seat 31 of the second check valve 29 is also opened by the oil flow, and the pressure of each circuit is reduced. Be even.
Therefore, the pressure in the oil passage 9 and its change are normally displayed on the pressure gauge 1.

Although the check valves 11 and 29 use the ball valves 14 and 32, it goes without saying that the check valves 11 and 29 may be poppets.

[0031]

The pressure gauge of the present invention implemented in the form described above has the following effects.

Since the first check valve for preventing the oil flow from the sensor section toward the oil path is provided between the oil path and the sensor section of the pressure gauge via a pressurized flow path, the maximum pressure is applied to the pressure gauge. If used while the return valve is opened while being held and displayed, the structure is such that the pressure in the oil passage and its change are displayed in a normal state, so that it is suitable for an anchor bolt pull-out strength testing device. In addition, since the second check valve for preventing the oil flow from the oil path to the return valve is interposed in the second relief pressure flow path communicating with the valve chamber of the return valve, the hydraulic pressure is applied to the return mechanism in the peak hold state. The peak hold can be eliminated with a light handle operation.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a hydraulic gauge according to the present invention.

FIG. 2 is a vertical sectional view in the orthogonal direction of FIG.

FIG. 3 is a sectional view showing a conventional example.

FIG. 4 is an explanatory view showing a hydraulic inspection device.

[Explanation of symbols]

1 pressure gauge, 2 display, 3 body, 4 sensor, 9
Oil passage, 10 pressurized flow path, 11 first check valve, 12
Valve chamber, 17 first relief pressure flow path, 18 return mechanism, 19 return valve, 19a valve chamber, 28 second relief pressure flow path, 29 second check valve,

Claims (1)

[Claims] 1. A hydraulic gauge comprising a pressure gauge having a display unit and a main body to which the pressure gauge is attached; wherein the main body includes a pressure gauge between an oil path and a sensor unit of the pressure gauge. A first check valve is provided for forming a peak hold of the pressure gauge by preventing an oil flow from the sensor section toward the oil path through the open pressurized flow path, and The valve chamber of the one check valve communicates with a return valve that opens and closes by operating a return mechanism via a first relief pressure flow path, and the valve chamber of the return valve communicates with a second relief pressure flow path that communicates with the oil passage. Is connected via a second check valve for preventing oil flow from the oil passage in the direction of the return valve.