JPS6163386A - Detecting method of compression quantity in gas pressure welding of reinforcing bar - Google Patents

Abstract

PURPOSE:To set automatically reinforcing bars to a correct pressure welding state, and to execute good gas pressure welding by controlling the quantity of pressurized oil by turning on a pressure switch to the prescribed quantity of compressed oil by a counter, based on the oil quantity to a unit moving extent of a pressure cylinder of a well-known pressure welding device, as a reference. CONSTITUTION:The discharge oil quantity of a motor-driven hydraulic pump by turning on a pressure switch 4 is controlled to the prescribed quantity of compressed oil by the integrating counting number of a counter of a counting circuit 5, based on the discharged oil quantity to a unit moving extent of a pressurizing ram cylinder 11 of a well-known pressure welding device 10, as a reference. Reinforcing bars are set automatically to a correct pressure welding state, and as for a worker, it is only necessary to devote himself to gas pressure welding work, and the gas pressure welding is executed satisfactorily.

Description

[Detailed description of the invention] Industrial application field: In order to reliably join the Vi reinforcing bars of the present invention during gas pressure welding work, a method of detecting the amount of compressive displacement of the reinforcing bars at the joint and confirming the welding condition. 〇Prior art and background of the invention: The gas pressure welding method, which is well known and widely used as a method for connecting steel materials such as reinforcing bars, is a method of joining steel materials such as reinforcing bars. It is difficult to identify the joint strength, and naturally there is a large fluctuation in the strength of the joint, resulting in a lack of reliability. In this gas pressure welding method, if the pressure per unit area of the welding surfaces of the materials to be welded is constant, the amount of compression is closely related to the plasticity of the materials to be welded by heating, and the appropriate or inappropriate amount of compression is determined. It is very important to control the pressure welding work by detecting the amount of compression during work, as it greatly affects the quality of the joint.

Conventionally, the amount of compression has been detected using a potentiometer connected directly or indirectly to the ram of the cylinder for pressurizing the material to be welded, but this method is inconvenient in handling and has a high failure rate. Due to this, I am still not in a satisfactory state. As a means for directly detecting the amount of displacement vJ of the pressurizing cylinder rim, there is a method in which a wire is directly connected to the hydraulic ram, and the wire is detected by t7t k from the front to the rear of the wire. -83648
However, in this type of system, the lead wire is installed in the gap between the lead wire and the actuator cable that covers the entire outer side, so that it can be used in a curved state or in a straight state. This will cause errors, and the failure rate will increase due to the slippage between the two. Also, as a means for indirectly detecting the amount of movement vJ of the hydraulic ram 1f, there is a method of branching and detecting the oil supplied to the pressurizing cylinder. issue and special public service in 1977
Although it is known from No. 8-23192, this method detects all changes in the force, and in this case, a pressure gauge is installed in the hydraulic circuit and the amount of displacement is read from this gauge. Because it is a model, worker monitoring is possible only 6 times.
Become delusional.

Although the workability of stationary pressure welding equipment is relatively easy, it is difficult to perform pressurization and heating operations directly at the site, especially at work sites where portable pressure welding equipment is used. At the same time, because the work is carried out by the same operator, oxidation of the welded end surfaces of the materials to be welded and shifts in the timing of pressurization are likely to occur, resulting in uneven welding. Therefore, there is a need for a measure to solve certain problems, improve workability, and enable accurate pressure welding.

Purpose of the invention: The final FIA was made in view of the circumstances;
The detection part for the amount of movement (compression amount) associated with pressurization is free of mechanical parts, detects the discharge pressure of the hydraulic pump during pressurization, and converts this discharge pressure into an electrical signal. The amount of compression of the pressure welded joint is detected from the amount of movement of the pressurizing ram sill ring within the set width, and the worker at the work site can concentrate only on heating work, thereby ensuring a homogeneous joint and improving the reliability of the pressure welded joint. Aiming at a method that can improve the structure of the invention: The final F3A achieves the desired purpose by providing a pressure switch connected to the discharge side of the electric hydraulic pump to the pressurizing ram cylinder in the known pressure welding device. NJ: Detect all the intermittent refueling time and generate the reference time on the on signal of this switch? /Res is used as a gate signal to calculate the total value on the counter using 1GK in the accounting cycle, calculate in advance, and calculate 111Il of the constant pressure ram cylinder! Program the numerical value according to the discharge income time when the hit movement occurs in the counter, and detect the compression transfer vJ amount in one easy step.
According to the program, the pressure setting conditions are changed between the contact process and the joining process of the pressurized reinforcing bars, and the end signal of each process is generated to correspond to all the heating work processes.Example: Hereinafter, the method of the present invention will be described in detail with reference to the drawings in accordance with an embodiment of the present invention. (11) Supply pipeline to (
A pressure switch (4) is attached to the pilot pipe (3) that overlaps with 21.
), the electrically actuated side full hydraulic pressure of the pressure switch (4),
An electric circuit connecting the pressure switch (4) and the motor (pump 11) is interposed in the motor power supply, and the electric circuit connecting the pressure switch (4) and the motor (pump 11) is branched and connected to the counting circuit (5).
When the set value is reached by the cumulative count in step 6), the pressure welding worker is notified when the connecting reinforcing bars are in close contact and when the pressure welding is completed, and the work can be switched to t.Thus, as an electric hydraulic pump +11 For example, a forced suction plunger pump with a small trochoid gear or a portable type is used (not limited to LVc). Pressure oil is supplied from the pressurizing ram cylinder (11 (pump 1) to the pressurizing ram cylinder (11) by repeatedly operating or stopping the pump +11 by turning on and off the pressure switch (4Lf7) to keep the pressurizing force constant. Pressure oil is intermittently fed into the ram cylinder (1 liter), so by detecting the amount of supplied MIr, the amount of reinforcement compression at the pressure welding part can be detected.Therefore, the discharge amount of the pump (1) is determined at the time of operation. Since the pressure switch (4) is proportional to the time during which the window is on, that time is integrated by the counting circuit (5) connected to the pressure switch (4) and detected as the discharge amount total pressure M amount. be.

As for this counting circuit (5), 9 and t are pump ill l l from the pressure switch (4) as shown in Figure 2.
ii An electromagnetic relay (6) that operates in response to a 9J signal;
The gate circuit (7) that supports this and the raw circuit developed at the reference time (
81, a pro-crime tank (9), and a block-rim switch (9').
) is taken out as a gate signal through the gate circuit (7), and the reference time signal of the mj generator (8) is passed through the gate circuit (7), and the reference time signal of the mj generator (8) is passed through the gate circuit (7).
The number is determined by the discharge amount per unit time of the pre-cut hydraulic pump (1) and the cross-sectional area of the pressurizing ram ring + 11),
Discharge required for the ram of the ram ring (11) to protrude 1M) 7? Determine the required time tS, program this value to the block rim switch (91,
9) and performs cumulative counting to detect the compression amount in IB units. Therefore, until the pressure NJ It is reached at the time of completion of pressure welding, the process is divided into the adhesion process until the ends of the reinforcing bars to be joined are brought into close contact, and the process of joining, and the heating operation with a rubberer that accompanies the pressure welding work is performed. When a predetermined amount of compression is reached, the buzzer is set to switch to the required condition (1 or stop) to give an instruction regarding the area heating operation.

In short, the procedure for pressure welding is the same as for normal pressure welding work, set all the reinforcing bars to be pressure welded in the pressure welding device, set the pressurizing ram cylinder llll' (operable tF!), and adjust the apparent pressure when joining the reinforcing bars. Set the compression amount setting switch to a predetermined level using the gap, and after applying pressure, heat the reinforcing bar butt part with a strong flame using a well-known heating burner (ring-shaped burner). At the same time, pressurize the ram cylinder 1)
When the pressure M reaches a preset amount, a buzzer sounds and the adhesion process ends at this point. Therefore, the heating burner was adjusted to a neutral flame, and when both reinforcing bars were fixed around the joint of the reinforcing bars and reached the age of 9, the buzzer sounded intermittently, and the buzzer was used as the signal to start the process! The entire process of edge pressure welding is completed by stopping 1. In addition, the pressurizing device is installed in the electric control mechanism and the control signal generating circuit to operate the solenoid valve, release the operation of the sill and the operation of the clamp mechanism, and move on to the next work IIC. be able to do so.

In this way, the method of the present invention can be applied to the discharge of a 2-ton hydraulic pump that presses the reinforcing bar holding the clamp part Ktfik of the pressure welding device against the pressurizing ram cylinder under predetermined conditions for pressure welding. This is due to a certain pattern in which the intermittent increase in the amount is converted into an on/off electrical signal according to the characteristics of the reinforcing bars connected to it, and the gate circuit is calculated using the kakunter. Instead, it sets the amount of pressure 16i, detects up to the rc failure value, and energizes the pressurizing force. With the J Yuou pump, the pump planner operates in the pressurizing side due to inertia in addition to the stoppage during intermittent operation due to turning on and off (confirmed in the test), so the pressurization does not affect the negative side. It can be added accurately.

Next, a specific example of the method of the present invention will be shown.

Electric! i! The lj hydraulic pump is a forced suction plunger pump with a small trochoid gear, and the discharge amount and pressure can be adjusted to any pressure between 200 and 300 cc/200 to 700, or 0 to 700 using the included adjustment valve. use something As a pressurizing ram sill for the pressure welding device, one with a standard inner diameter of 40 mm and a stroke of 70 mm was used. Connect n7, which is attached to the pump discharge volume, to the pressure switch and the input part of the four circuits, and use the on signal as the gate signal to open the tail at half an hour/crus (6 of the open power supply).
0H2 or H50Hz (formatted and used) is integrated and counted by the program kakunku, and it is converted into cod units and detected as pressure compensation. This (No. 8 output is set as C and input to the decimal kakunter. The output of the decimal kakungu (S-sa (converted to 2 steps)?! One process is 1jlJ control signal, and the pressure &J in the contact process is The amount should be at least 4 + m, and the apparent IMI gap above should be O (>'C), and if ξ is 2
A gap setting switch that can be set at 4.6.8.1O112 intervals is used to switch the reference voltage for pressure setting as a signal for the end of the adhesion process, and at the same time a buzzer sounds for about 1 second. The subsequent joining process is a total reduction i (approximately 2 of the reinforcing bar diameter)
．． As a double, the output of the kakunta is controlled according to the size of the reinforcing bars (by switching, t switch). During the joining process, pressurized oil is sent intermittently, and when a predetermined signal is generated, the hydraulic pump is stopped.At the same time, a buzzer sounds for about 3 seconds to signal the end of the work, and then the electromagnetic release valve is activated to increase the pressurizing force. release and reset the electrical controller circuit at the same time.

Table 1 shows the results of this gill press contact. Please note that the fractured surfaces of reinforcing bars that were edge-welded in this test passed the criteria, and most of the steel bars exhibited 100% crystalline fracture surfaces.

Effects of the invention: As described above, according to the present invention, the discharge pressure of the hydraulic pump that operates intermittently can be adjusted based on the volume of oil corresponding to the unit displacement of the hydraulic ram cylinder, which is known in advance. is converted into an electrical signal via a pressure switch, and the on-signal of the switch is converted into a gate signal, which is counted and integrated to detect the amount of compression and control the pressure welding state. It eliminates the errors that occur with mechanical detection means, allows control to immediately respond to the state of the material to be welded during welding, and allows the operator to concentrate on heating the reinforcing steel, making it more reliable as a joint. It became a trap to create a high pressure weld.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an embodiment of means for carrying out the method of the present invention;
FIG. 2 is a block diagram of the counting circuit.

Claims (1)

[Claims] A pressure switch connected to the discharge side of the electric hydraulic pump to the pressurizing ram cylinder in a known pressure welding device detects the intermittent supply of oil, and gates the on signal of this switch and the reference time generation pulse. As a signal, the counter of the counting circuit calculates the total value, and the pre-calculated value based on the discharge time required for moving the pressurizing ram cylinder per 1 mm is programmed into the counter, and the value integrated by the output of this counter is used for reinforcing reinforcement A method for detecting the amount of compression in gas pressure welding of reinforcing bars, characterized in that the amount of compression during gas pressure welding is expressed.