JP3022945U - Penetration testing machine - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To record a mark line in synchronization with stoppage of penetration of a penetration rod. SOLUTION: When a hammer hits a penetrating rod, a paper feed shaft 82 rotates in conjunction with the movement of the penetrating rod. Rebound cam 9 free from paper feed shaft 82
8 sometimes rotates in advance of the paper feed shaft 82 due to the impact of the impact, and then the rotation restricting disc 102 fixed to the paper feed shaft 82 and the rebound cam 98 are moved in the direction opposite to the paper feed direction. It is interlocked with the paper feed shuff 82 by the biasing spring 100. The rebound cam switch 104 is turned on / off by the periodic unevenness of the peripheral surface of the rebound cam 98. When switch 104 remains either on or off, pen motor 120 is started and rotates to the standby position. Meanwhile, the recording pen 110 writes one mark line on the recording paper 64.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to a penetration tester that measures the ground proof strength from the penetration level of a penetration rod or a penetration rod driven into the ground.

[0002]

[Prior art]

 A conventional example of such a penetration tester is described in Utility Model Registration No. 3003808. In the conventional example, the recording paper is made to run in synchronization with the penetration of the penetrating rod into the ground against the bearing capacity of the hammer by hammering, and a mark signal is written on the recording paper at regular intervals. It has become.

In the above-mentioned publications, particularly in the conventional examples shown in FIGS. 1 to 4, as a means for writing a mark signal on a recording paper, a recording pen is kept in pressure contact with the peripheral edge of a pen drive cam 34, and a motor 36 is used. Thus, by rotating the pen drive cam 34, one mark signal is written on the recording paper each time the hammer is hit. The peripheral shape of the pen drive cam 34 is formed such that the mark signal once every five times is longer than the others.

When the limit switch 122 detects that the hammer 112 hitting the penetrating rod has risen to a predetermined height, a drive current is temporarily supplied to the motor 36 after a lapse of a fixed time of about 1 second. A switch drive cam 38 is fixed to the rotation shaft of the motor 36 in the same axis as the pen drive cam 34. When the motor 36 rotates a little, the switch drive cam 38 closes the switch 40 until it rotates a predetermined angle. The supply of the drive current to the motor 36 is maintained.

The hammer 112 is lifted up to the hammer lift limiter 120 by the chain 116, and then falls freely to hit the knocking head 106 on the head of the penetrating rod 104. As a result, the penetrating rod 104 penetrates into the ground with a constant force. The limit switch 122 described above causes the hammer lift limiter 120 to rotate the motor 36 when the hammer 112 is raised to a predetermined height, as previously described.

A peripheral edge of the penetration distance detecting wheel 136 is pressed against a side surface of the penetration rod 104 by a spring 138, and the penetration distance detection wheel 136 rapidly rotates by an angle corresponding to the movement of the penetration rod 104. The shaft of the wheel 136 is connected to the recording paper feed shaft 18 via a universal joint 142, and the recording paper is fed as the wheel 136 rotates.

As a result, the recording paper is fed by the length corresponding to the penetration distance of the penetrating rod 104, and one mark line is written on the recording paper when the paper feeding of the recording paper is stopped. It The penetration distance of the penetration rod can be known from the distance between the mark lines.

[0008]

[Problems to be solved by the device]

 In the conventional example, the limit switch 122 for starting the motor 36 must be provided at a position corresponding to the ascending position of the hammer that strikes the penetrating rod, which is one of the causes of the high cost. Also, in the penetration tester, one mark line is written after the recording paper is sent a distance corresponding to the penetration of the penetration rod into the ground by one impact, so that the hammer A timer that assumes a certain time from the start of falling to the stop of recording paper must be provided in the middle. This is difficult to handle, for example, when you want to freely set the fall distance of the hammer.

An object of the present invention is to provide a penetration tester that can be manufactured at a lower cost and can flexibly cope with changes in usage conditions.

A further object of the present invention is to provide a penetration tester capable of starting recording immediately upon completion of movement of the penetration rod so that repeated measurements can be performed quickly.

[0011]

[Means for Solving the Problems] In the present invention, since the marking line is automatically written on the recording paper in response to the stop of the paper feeding operation due to the impact of the penetrating rod, the next measurement, that is, the penetrating rod is quickly performed. Can move to the blow. Also, since it is not necessary to always wait for the time from the time when the hammer is hit until the paper feed is stopped, it becomes easier to support a wide range of bearing capacity. A sturdy structure that can withstand the impact of hitting the penetrating rod with a hammer can be realized.

The excessive paper feed prevention means or the backlash prevention means can keep the recording paper always taut.

The structure including the spring-biased rebound cam, the rebound cam switch, the rebound cam relay, the first and second capacitors and the pulse relay has a simple and shock-resistant structure. , Hard to break down.

[0014]

[Embodiment of device]

 An embodiment of the present invention will be described below with reference to the drawings.

One embodiment of the present invention mainly comprises a driving machine for driving a penetrating rod into the ground, and a recording machine for recording the state of the penetration of the penetrating rod by the driving machine on a recording paper. 1 is a perspective view of a driving machine of this embodiment, FIG. 2 is a perspective view of a mechanism system of a recording machine, and FIG. 3 is a schematic configuration diagram of a circuit portion of this embodiment.

First, the structure of the driving tool shown in FIG. 1 will be described. The driving machine 10 has a pedestal 12 on which a stanchion 14 is erected. Sprockets 16 and 18 are arranged at the upper and lower ends of the stanchion 14, respectively, and a chain 20 is wound between the sprockets 16 and 18. The lower sprocket 18 is rotated by a lift motor 22.

The penetrating rod 24 has an inverted conical shape at the lower end, and a knocking head 26 is fixed to the upper end. Guide poles 28, 28 for guiding the vertical movement of the penetration rod 24 are erected on both sides of the column 14, and the guide poles 28, 28 are vertically movable along the guide poles 28, 28. The root portion of the support arm 30 is fixed to the upper end of the penetrating rod 24. The support arm 30 supports the penetrating rod 24 movably up and down parallel to the guide pole 28, and thus the column 14.

A hollow hammer guide pipe 32 is further fixed to the upper surface of the knocking head 26, and a guide rod 34 is inserted into the hollow portion from above. The upper end of the guide rod 34 is fixed to the L-angle 36 extending laterally from the column 14. The guide rod 34 passes through the hollow portion of the hollow hammer guide pipe 32, and the penetrating rod 24 is supported by the guide pole 28 via the support arm 30 so as to be vertically movable. Can be moved only in parallel to the column 14.

The hammer 38 has a hollow cylindrical shape, and the hammer guide pipe 32 is passed through the hollow portion. Therefore, the hammer 38 is basically movable along the hammer guide pipe 32. The hammer 38 is freely locked to the climbing chain 20 via a locking arm 40. When the chain 20 rotates between the sprockets 16 and 18 by the rotation of the lift motor 22, the locking arm 40, and thus the hammer 40, is carried upward as the chain 20 moves. At the upper position of the hammer guide pipe 32, there is fixed a hammer releasing member 42 which moves the engaging arm 40 of the hammer 38 laterally from the chain 20 to release it from the chain 20.

The position where the hammer release member 42 is fixed to the hammer guide pipe 32 is adjustable. The position where the hammer release member 42 is fixed to the hammer guide pipe 32 defines the distance from when the hammer 38 has risen all the way to hit the knocking head 26, that is, the force with which the knocking head 26 is hit.

A penetration detecting wheel 44 is strongly pressed against a side surface of the penetration rod 24 by a spring 46 so as not to slip on the penetration rod 24. The penetration detection wheel 44 is held at a predetermined height with respect to the base 12 by a holding member (not shown). As the penetration rod 24 moves, the penetration detection wheel 44 rotates at an angular speed corresponding to the moving speed thereof and at an angle corresponding to the moving distance. A shaft 48, which is the center of rotation of the penetration detection wheel 44, is connected to a recording machine 60 via a universal joint 50.

The pedestal 12 further has a normally open bottom limit switch 52 fixed by the support arm 30 when the penetration rod 24 penetrates into the ground to a predetermined depth. The height of the bottom limit switch 52 is adjustable.

A remote control switch device 62 for starting and stopping recording is connected to the recorder 60.

An electric cable for connecting the lift motor 22 and the bottom limit switch 52 of the driving machine 10 and the electric circuit of the recording machine 60 is omitted in the drawing.

The structure of the mechanical portion of the recording machine 60 will be described with reference to FIG. The recording paper 64 is accommodated in a roll-like state in a cylindrical transparent dustproof cover 66 having a slit for taking out the recording paper 64 in a part thereof. The dustproof cover 66 is rotatably supported between support plates 70 and 72 which are erected on a base plate 68.

The recording paper 64 taken out from the dustproof cover 66 is taken up by a take-up roller 76 via a paper feed roller 74. The winding roller 76 is rotationally driven by a winding motor 78. A large number of small holes, that is, perforations 80 having predetermined intervals are formed on both sides of the recording paper 64, and the paper feed roller 76 and the take-up roller 76 are provided with sprockets which fit into the perforations. Such a paper feeding mechanism itself is well known.

A paper feed shaft 82, which is the center of rotation of the paper feed roller 74, is rotatably attached to the support plates 70 and 72. FIG. 4 shows a front view of the portion related to the paper feed roller 74 and the paper feed shaft 82 (a view seen from the direction A in FIG. 2), and a side view (a view seen from the direction B of FIG. 2). . That is, the paper feed shaft 82 is attached to the support plates 70 and 72 via the bearings 84 and 86, respectively. The paper feed shaft 82 extends largely on the side of the support plate 70, and has a recess, that is, a connection terminal 82a, formed at its end for connecting with the universal joint 50 (FIG. 1).

A spring receiving ring 88 is fixed to the portion of the paper feed shaft 82 that extends from the support plate 70. The backlash preventing spring 90 has one end fixed to the ring 88 and the other end pressed against the bearing 84 via the clutch plate 92. A central sectional view of the bearing 84 and the clutch plate 92 is shown in FIG. As can be seen from FIG. 6, a rubber ring 94 is fitted in the clutch plate 92 and the bearing 84 so that the clutch plate 92 does not easily rotate with respect to the bearing 84. The spring 90 always acts on the recording shaft 82 so as to apply a tension within a certain range in a direction opposite to the feeding direction of the recording paper 64. With this configuration, it is possible to prevent the recording paper 64 from being excessively fed due to the impact of the impact of the penetrating rod 24.

Since the spring 90 is only pressed against the clutch plate 92 and the clutch plate 92 is in close contact with the bearing 84 via the rubber ring 94, the paper feed shaft 82 is penetrated by a certain amount or more of penetration. When the sheet 90 rotates in the paper feed direction and the spring 90 is charged (that is, the tension of the recording sheet 64 becomes high), the slip between the spring 90 and the clutch plate 92 and / or the clutch plate 92 occurs. A slip between the rubber ring 94 and the rubber ring 94 occurs, and the tension of the recording paper 64 is relaxed.

A rebound cam 98 is further attached to the paper feed shaft 82 via a bearing 96. A weak spring 100 is hung between the rebound cam 98 and the spring receiving ring 88 to lightly urge the rebound cam 98 in the direction opposite to the paper feeding direction. One end of the spring 100 is fixed to the rebound cam 98, and the other end is fixed to the spring receiving ring 88. The hammer 38 absorbs the impact under impact on the knocking head 26 of the penetration rod 24 by the spring 100.

Further, the disc 102 for restricting the rotation of the rebound cam 98 is fixed to the paper feed shaft 82 in contact with the side of the rebound cam 98 where the spring 100 is not provided. As can be easily seen from FIG. 5, a part of the disk 102 protrudes in the radial direction, and a pin 98 a that is erected on the side surface of the rebound cam 98 abuts on the protruding part according to the acting force of the spring 100.

By these means 98 a, 100, 102, the rebound cam 98 is moved in the direction opposite to the paper feeding direction or the paper feeding direction by the impact of the knocking head 26 by the hammer 38 and the subsequent movement of the penetrating rod 24. Rotate freely. For example, the impact of the knocking head 26 hit by the hammer 38 causes the rebound cam 98 to rotate in the paper feed direction prior to the rotation of the paper feed shaft 82, and after some rotation, the action of the spring 100. The force causes reverse rotation to a position where it follows the disc 102, and thereafter follows the rotation of the disc 102, that is, the rotation of the paper feed shaft 82.

A large number of irregularities are periodically formed on the peripheral surface of the rebound cam 98, and a rebound cam switch 104 which is opened or closed by the irregularities is arranged on the base plate 68. There is. That is, the rebound cam switch 104 is a switch that is closed when the lead piece 104a is in contact with the convex portion of the rebound cam 98, and is opened when it is in contact with the concave portion of the rebound cam 98. .

The recording pen 110 is housed in the pen holder 112 so that the pen tip can press the recording paper 64 on the recording paper feed roller 74 to write a mark line. A support rod 114 extends laterally from the side surface of the pen holder 112, and the support rod 114 slides on the support plate 70 so that the pen holder 112 is movable in the width direction of the recording paper 64. It is supported freely. The support rod 114 is configured to press the end portion of the support rod 114 against the peripheral surface of the pen drive cam 118 by the spring 116. The pen drive cam 118 is rotated by a pen motor 120, and a switch drive cam 122 is fixed to the same rotation shaft thereof. That is, the pen drive cam 118 and the switch drive cam 122 are rotated together by the pen motor 120.

On the peripheral surface of the pen drive cam 118, there are five depressions at regular angular intervals, one of which is deep. By the rotation of the pen drive cam 118, the recording pen 110 is instantaneously moved five times in the width direction of the recording paper 64 by one rotation and returned, and five mark lines are written on the recording paper 64. One of the five mark lines is a long line. By pulling the support rod 114 away from the pen drive cam 118 against the spring 116, the mark line indicating the recording start position can be manually written.

On the peripheral surface of the switch driving cam 122, five small depressions are formed at regular angular intervals. As will be described later in detail, the switch drive cam 122 defines the standby position where the pen motor 120 is stopped. The standby position is set, for example, so that the support rod 114 is located between the recesses of the pen drive cam 118. The lead piece of the pen motor cam switch 124 contacts the peripheral surface of the cam 122. As shown in FIG. 3, the pen motor cam switch 124 is composed of two switches 124a and 124b, and these switches 124a and 124b open and close according to the rotation of the switch drive cam 122. When the switch 124a is open, the switch 124b is closed, and conversely, when the switch 124a is closed, the switch 124b is open.

The operation of this embodiment will be described in detail centering on the operation of the circuit shown in FIG. AC100V is applied between the input terminals 210 and 212. The remote control switch device 62 comprises a normally open switch 62a and a normally closed switch 62b. The switch 62a is a test start switch and the switch 62b is a test stop switch. When the operator presses the switch 62a, the switch 62a closes while being pressed. Then, AC100V between the input terminals 210 and 212 is applied to the motor relay 214 via the normally closed bottom limit switch 52 and the switch 62a, and a current flows. As a result, the switches 214a, 214b, 214c are closed.

When the switch 214a is closed, a circuit that constantly supplies a current to the motor relay 214 via the bottom limit switch 52, the switch 62b, and the switch 214a is formed. Even if the finger is released from the switch and the switch 62a is returned to the open state, the current continues to flow to the motor relay 214.

When the switches 214b and 214c are closed, a drive current is applied to the lift motor 22 and the winding motor 78. The lift mo 22 rotates the sprockets 16 and 18 to move the chain 20 and raise the hammer 38. When the hammer 38 is lifted up to the hammer release member 42, the hammer release member 42 prevents further rise of the hammer 38, which causes the locking arm 40 to open left and right to separate from the chain and allow the hammer 38 to fall freely.

On the other hand, the winding motor 78 is in a stopped state because it is coupled to the winding roller 76 via the slip mechanism and the rotary shaft 82 of the paper feed roller 74 is stopped. As will be described later, when the paper feed shaft 82 is rotated in the paper feed direction by the penetration rod 24 penetrating into the ground, the take-up roller 76 is rotated by an amount corresponding to the penetration distance of the penetration rod 24. As a result, a considerable amount of the recording paper 64 is taken up by the take-up roller 76.

Further, in a state in which a current is flowing through the motor relay 214, an AC voltage is applied to the diode 218 via the switches 52, 62b, 214a and the resistor 216 of 3 kΩ, and half-wave rectification is performed. The voltage half-wave rectified by the diode 218 is applied to the anti-chart relay 220 and the series circuit of the resistor 222 of 4 kΩ and the capacitor 224 of 33 μF. The capacitor 224 is charged by the half-wave rectified voltage and discharged by the diode 218 in the remaining half cycle of the AC voltage. A current of half-wave rectification by the diode 218 and a discharge current of the capacitor 224 flow through the anti-chart relay 220, whereby the switches 220a and 220b are closed.

When the bottom limit switch 52 is opened or the operator operates the switch 62b of the remote control switch device 62 to temporarily open it, the current supply to the motor relay 214 is cut off. Then, the switches 214a, 214b, 214c are opened. In response to this, the charging of the capacitor 224 by the half-wave rectified voltage of the diode 218 is also stopped, and the switch 220a returns to the open state after waiting for the discharge current of the capacitor 224 to flow to the anti-chart relay 220.

By providing the anti-chart relay 220, that is, the switch 220a, when the switch 52 or the switch 62b is opened, even if current is flowing through the pulse relay 242, supply of AC100V to the diode 246 is performed. Hold for a little (about 0.5 seconds) and then shut off. As will be understood from the description below, this causes the pen motor 120 to rotate to the next standby position, during which the recording pen 110 writes one mark line on the recording paper 64. Make sure the last mark line is filled.

By closing the switch 220b, AC 100V between the input terminals 210 and 212 is applied to the light emitting diode 228 via the resistor 226 of 10 kΩ, and the light emitting diode 228 emits light. This allows the operator to confirm that the test machine is in the recording standby state.

As described above, when the hammer 38 is lifted by the lift motor 22 from the knocking head 26 of the penetrating rod 24 to the height of the hammer releasing member 42, the locking arm 40 of the hammer 38 is locked. Off, the hammer 38 falls free and strikes the knocking head 26. By this impact, the penetration rod 24 penetrates into the ground against the proof stress. The linear movement of the penetrating rod 24 is converted into a rotational movement by the detection wheel 44 and then transmitted to the paper feeding shaft 82 via the universal joint 48. The paper feed roller 74 rotates by an angle corresponding to the penetration distance of the penetration rod 24 and stops, so that the winding motor 78 can wind the recording paper 64. Since the winding motor 78 is already in a state in which the drive current is applied after the operation of the switch 62a of the remote control switch device 62, the recording paper 64 actually corresponds to the penetration distance of the penetration rod 24. The winding roller 76 is wound up by an angle.

The rebound cam 98 also rotates along with or prior to the rotation of the paper feed shaft 82, and the rebound cam switch 104 repeats ON / OFF according to the unevenness of the peripheral surface thereof. When the paper feed shaft 82 is stopped, the switch 104 remains in either the on or off state. Every time the rebound cam switch 104 is turned on, current flows through the rebound cam relay 230 to switch the switches 230a and 230b from a contact to b contact. When the rebound cam switch 104 is turned off, the switches 230a and 230b are switched from the b contact to the a contact.

When the switch 230a is connected to the contact a, the capacitor 236 of 2 μF is charged via the resistor 234 having a half-wave rectified voltage of 1 kΩ by the diode 232 and the switch 230a, while the switch 230b is connected to the contact b. When connected, the half-wave rectified voltage by diode 232 charges 2 μF capacitor 238 through resistor 234 and switch 230b. That is, the capacitor 236 is charged when the rebound cam switch 104 is opened, and the capacitor 238 is charged when the switch 104 is closed.

Since the b-contact of the switch 230a and the a-contact of the switch 230b are commonly connected to the pulse relay 242 via the resistor 240, when the switch 104 is opened, the capacitor 238 charges its charged electric charge by 1 kΩ. Through the resistor 240 and the relay 242, and the capacitor 236 discharges the charged electric charge through the resistor 240 and the relay 242 when the switch 104 is closed. When current flows through the pulse relay 242, the switch 242a closes.

With such a dual structure of the switches 230a and 230b and the capacitors 236 and 238, it is possible to determine whether the paper feed shaft 82 is rotating or not by merely providing irregularities of a small period on the peripheral surface of the rebound cam 98. It can be easily detected and an electrical signal can be generated to indicate that it is rotating. Accordingly, the rotation stop of the paper feed shaft 82 can be detected. In the penetration tester of the present embodiment, not only the penetration rod 24 but also the mechanical portion including the universal joint 50 and the paper feed shaft 82 is given a considerable impact, but in the present embodiment, the structure is extremely simple. Thus, it is possible to detect the start of penetration of the penetration rod 24 and even stop the penetration, and it is possible to realize high impact resistance.

The pen motor cam switch 124 opens and closes according to the unevenness of the peripheral surface of the switch drive cam 122 connected to the rotating shaft of the pen motor 120. That is, the switch 124a of the pen motor cam switch 124 is closed and the switch 124b is opened at the five recessed portions of the peripheral surface of the switch drive cam 122, and conversely in the portions other than the five recessed portions, the switch 124a is closed. Is open and the switch 124b is closed. At the start of recording, as shown in FIG. 3, the switch 124a is closed and the switch 124b is open. For some reason, when not in such a state, power is supplied to the pen motor 120 through the closed switch 124b, so that the pen motor 120 includes the switch 124a closed and the switch 1 It rotates to the position where 24b is opened and stops. This stop position corresponds to the standby position described above.

While the paper feed shaft 82 is rotating, a current flows through the pulse relay 242 and the switch 242a is closed, as described above. Since the switch 124a and the switch 220a of the pen motor cam switch 124 are closed, 100V AC is applied to the diode 246 via these switches 124a, 220a, 242a. The voltage half-wave rectified by the diode 246 is applied to the series circuit of the resistor 248 of 2 kΩ and the top relay 250, and the capacitor 252 of 10 μF. As a result, the capacitor 252 is charged in a half cycle of AC100V and discharged in the remaining half cycle.

The resistance value of the resistor 248 and the capacitance of the capacitor 252 are set so that the current flows through the top relay 250 over the entire cycle of AC 100 V by the discharge of the capacitor 252 regardless of the half-wave rectification by the diode 246. There is. Therefore, until some of the switches 124a, 220a or 242a are opened and the capacitor 252 is discharged to a predetermined value (usually, the paper feed shaft 82 is rotating and a short time after stopping). In the meantime), the top relay 250 connects the switch 250a to the a contact side.

The switch 250a is normally connected to the b-contact, but is connected to the a-contact only when current is flowing through the top relay 250. When the switch 250a connects to the a contact, 100V AC is half-wave rectified by the diode 254 and applied to the 22 μF capacitor 258 through the switch 250a and the 2 kΩ resistor 256. That is, the capacitor 258 is charged.

When current stops flowing in the relay 250 and the switch 250a is switched to the b contact due to the rotation of the paper feed shaft 82, etc., the capacitor 258 includes the resistor 256, the switch 250a and the one relay 260. To discharge through. When a current flows through the relay 260, the switch 260a is closed and 100V AC is applied to the pen motor 120 and the counter 262. The closing time of the switch 260a is set to about 1 second.

In this way, after the rotation of the paper feed shaft 82 is stopped, the pen motor 120 is started to rotate the pen drive cam 118 and the switch drive cam 122. When the switch driving cam 122 rotates slightly, the switch 124a is opened and the switch 124b is closed, so that the pen motor 120 is thereafter supplied with power via the switch 124b. The rotation of the pen drive cam 118 causes the recording pen 110 to move in the width direction of the recording paper 64 at the recessed portion, thereby writing one mark line on the recording paper 64. Note that one of the five recesses provided on the peripheral surface of the pen drive cam 118 is deep, so that a mark line longer than usual is recorded on the recording paper 64 once every five times.

At an appropriate position (the above-mentioned standby position) where the pen drive cam 188 has finished writing the mark line on the recording paper 64, the switch drive cam 122 closes the switch 124 a of the pen motor cam switch 124. , The switch 124b is opened. This prepares for the next impact with the hammer 38.

The counter 262 counts the number of times the penetration rod 24 is hit by the hammer 38 by counting the rise of the input voltage (about AC 100 V).

The capacitance value of the capacitor 258 and the resistance value of the resistor 256 are at least the time required for the pen motor 120 to rotate the switch driving cam 122 to a position where the switch 124a is opened (that is, the switch 124b is closed). In the embodiment, it is set so that a current is passed through the one relay 260 for about 1 second to close the switch 260a. Even after this time has elapsed, when the switch driving cam 122 is in the position to close the switch 124b, as described above, the switch 124b is turned on until the switch 124b is opened (standby position). Power for rotation is supplied to the pen motor 120 via the pen motor 120, and the pen motor 120 continues to rotate.

Since the switch 124a is opened when the switch driving cam 122 slightly rotates, AC100V is not applied to the diode 246 regardless of the switches 220a and 242a. Even if the capacitor 258 is charged, the capacitor 258 is completely discharged through the resistor 256, the switch 250a and the relay 260 to prepare for the next penetration test.

When the pen motor 120 slightly rotates from the standby position, the switch 124 b changes from the open state to the closed state, and at the same time, the switch 124 a changes from the closed state to the open state. Since the switch 260a is opened after a delay of the time constant, the power supply to the pen motor 120 is not momentarily interrupted when the switches 124a and 124b are switched.

AC 100 V is constantly applied to the series circuit of the light emitting diode 264 and the resistor 266 of 10 kΩ. That is, the light emitting diode 264 functions as a power lamp indicating that AC 100V is being supplied to the circuit shown in FIG.

Since the drive voltage is still applied to the lift motor 22 and the take-up motor 78, the lift motor 22 lifts the hammer 38 from the knocking head 26 of the penetrating rod 24 to a set height and causes it to fall freely. . The cycle in which the lift motor 22 lifts the hammer 38 is within a range of measurable bearing capacity, from dropping the hammer 38 to hitting the penetrating rod 24, stopping the movement of the penetrating rod 24, and marking the mark line. It is set to exceed the period.

When the penetrating rod 24 is fully lowered by one or several hits by the hammer 38, the bottom limit switch 52 is opened, or the operator opens the switch 62b of the remote control switch device 62. The current is not supplied to the motor relay 214, and the switches 214a, 214b, 214c are opened. As a result, the drive power is not supplied to the lift motor 22 and the winding motor 78, and both motors 22 and 78 are stopped. Further, after waiting for the discharge of the capacitor 224 (which ends in an extremely short time), no current flows in the anti-chart relay 220, so that the switch 220a is opened. The subsequent operation is the same as when the switch 242a is opened, and the pen motor 120 stops at the standby position.

In the above embodiment, the rebound cam 98, the spring 100, the rotation restriction disk 102, the rebound cam switch 104, the rebound cam relay 230 (switches 230a and 230b), the capacitors 236 and 238, and the pulse. The relay 242 detects the rotation and the stop of the rotation of the paper feed shaft 82, and as a result thereof, a mark line is formed on the recording paper 64 each time the knocking head 26 is hit by the hammer 38, that is, the penetrating rod 24 is hit. To record. With such a configuration, the mark line can be recorded immediately after the penetration of the penetration rod 24, and the continuous penetration test can be performed in a short time.

Further, due to the structure including the spring receiving ring 88, the backlash preventing spring 90, the clutch plate 92 and the rubber ring 94, the recording paper 64 can always be properly tensioned. Winding up and marking lines will be done smoothly. This structure also has a structure that is strong against the impact caused by the impact of the penetrating rod 24, so that high durability can be realized.

[0066]

[Effect of device]

 As can be easily understood from the above description, according to the present invention, recording can be started promptly in response to the impact of the penetrating rod. Further, it is possible to provide a penetration tester having high durability.

In the driving machine, since the switch for detecting the release of the hammer hitting the penetrating rod is not necessary, the wiring for the switch is also unnecessary, and only the part of the driving machine is required. In addition, the cost can be reduced, and the assembly work for manufacturing and testing can be simplified.

Furthermore, the recording paper can always be kept taut by the excessive paper feed prevention means or the backlash prevention means.

[Brief description of drawings]

FIG. 1 is a perspective view of a driving machine according to an embodiment of the present invention.

FIG. 2 is a perspective view of a mechanical portion of the recording machine of this embodiment.

FIG. 3 is a configuration diagram of a circuit portion of this embodiment.

4 is a front view of a portion related to a paper feed roller 74 and a paper feed shaft 82 as seen from the direction A in FIG.

5 is a side view of a portion related to the paper feed roller 74 and the paper feed shaft 82 as viewed from the direction B in FIG.

6 is a central sectional view of a portion of a bearing 84 and a clutch plate 92. FIG.

[Explanation of symbols]

 10: Driving machine 12: Pedestal 14: Struts 16, 18: Sprocket 20: Chain 22: Lift motor 24: Penetration rod 26: Knocking head 28: Guide pole 30: Support arm 32: Hammer guide pipe 34: Guide rod 36: L angle 38: Hammer 40: Locking arm 42: Hammer release member 44: Penetration detection wheel 46: Spring 48: Shaft 50: Universal joint 60: Recorder 52: Bottom limit switch 62: Remote control switch Device 64: Recording paper 66: Dust cover 68: Base plate 70, 72: Between support plates 74: Paper feeding roller 76: Winding roller 78: Winding motor 80: Perforation 82: Paper feeding shaft 82a: Connection terminal 84, 86 : Bearing 88: Spring receiving ring 90: Anti-crush spring 92: Clutch plate 94: Rubber ring 96: Bearing 98: Rebound cam 98a: Pin 100: Spring 102: Rotation regulation disk 104: Rebound cam switch 104a: Lead piece 110: Recording pen 112: Pen holder 114: Support rod 116: Spring 118: Pen drive cam 120: Pen motor 122: Switch drive cam 124: Pen motor cam switch 124a, 124b: Switch 210, 212: AC100V input terminal 214: Motor Relays 214a, 214b, 214c: Switch 216: Resistor 218: Diode 220: Anti-chart relay 220a, 220b: Switch 222: Resistor 224: Capacitor 226: Resistor 228: Light emitting diode 230: rebound cam relay 230a, 230b: switch 232: diode 234: resistor 236, 238: capacitor 240: resistor 242: pulse relay 242a: switch 246: diode 248: resistor 250: top relay 250a: switch 252: Capacitor 254: Diode 256: Resistor 258: Capacitor 260: One relay 260a: Switch 262: Counter 264: Light emitting diode 266: Resistor

Claims (7)

[Scope of utility model registration request] 1. A penetration testing machine for hitting a penetration rod with a hammer to penetrate into the ground, and recording the amount of penetration of the penetration rod on a recording paper each time the hammer hits the penetration rod. A converting means for converting the linear motion of the rod into a rotational motion, a paper feeding means for feeding the recording paper by the rotational motion of the converting means, and a paper feed stop detecting means for detecting a paper feed stop of the recording paper, A penetration testing machine, comprising: recording means for writing a mark line on the recording paper in accordance with an output of the paper feeding stop detecting means according to the paper feeding stop of the recording paper. 2. The recording means drives the recording pen to write the mark line on the recording paper, and the pen drive means to a predetermined standby position according to the output of the paper feed stop detecting means. The penetration tester according to claim 1, further comprising: a control unit that is operated and causes the pen driving unit to record the mark line on the recording sheet. 3. The penetration testing machine according to claim 1, wherein the paper feed stop detection means is means for detecting rotation stop of the paper feed means of the paper feed means. 4. The paper feed stop detection means is rotatable with respect to a paper feed shaft of the paper feed means, and is biased in a direction opposite to the paper feed direction of the recording paper.
A peripheral surface of the rebound cam, which is fixed to the paper feed shaft and which controls the rotation of the rebound cam in the paper feed direction, which is fixed to the paper feed shaft. Rebound cam switch that turns on / off in contact with the rebound cam switch, and connects the first and second switches to the a contact when the rebound cam switch is off.
A rebound cam relay that connects the first and second switches to the b contact when the cam switch is on, and is charged when the first switch connects to the a contact and connects to the b contact A first capacitor that discharges at times, a second capacitor that charges when the second switch connects to the b contact, and a discharge that discharges when connecting to the a contact, and The penetration tester according to claim 3, comprising a pulse relay operated by a discharge current. 5. Further, a tension in a predetermined range is applied to the recording paper in a direction opposite to the paper feeding direction,
The penetration testing machine according to any one of claims 1 to 4, further comprising: an excessive paper feed prevention unit that prevents excessive paper feed of the recording paper. 6. The penetration test according to claim 5, wherein the excess paper feed preventing means comprises a coil spring having one end fixed to the paper feeding means and the other end pressed against a stationary portion via a clutch plate. Machine. 7. The backlash preventing means for preventing backlash of the paper feeding means is further provided.
The penetration tester according to any one of 1 to 4.