JP2004263417A - Automatic penetration tester - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an automatic penetration tester realizing a rapid and accurate load change. <P>SOLUTION: In the automatic penetration tester having a lift base 3 vertically movable along a strut, a chuck 4 rotatably mounted on the lift base 3, a chuck rotary driving means 5 for the chuck 4, a penetration rod 6 retained in the chuck 4, and an elevator unit 7 vertically moving the lift base 3 along the stud 2, the elevator unit 7 is provided with a sprocket wheel 21 rotated by the driving force of a rotary driving means 22 for lifting for creating the lifting motion of the lift base 3 by the rotation and a powder clutch 23 which can connect the sprocket wheel 21 and the rotary driving means 22 for lifting by a specified clutch force. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an automatic penetration tester that penetrates a penetration rod into the ground, collects various data, and investigates the ground strength and the like of the land.
[0002]
[Prior art]
When building a relatively small building such as a residential land, it is necessary to investigate the strength of the ground at the planned construction site. In recent years, a test in accordance with Japanese Industrial Standard A1221 “Swedish sounding test method” (hereinafter referred to as “penetration test”) has been widely performed.
[0003]
In the penetration test, the penetration of the penetration rod is observed by observing the penetration of the penetration rod into the ground only by the load while increasing and decreasing the load by the unit of 250N, and the penetration of the penetration rod is performed by rotating and driving the penetration rod under the load of 1KN (1000N) It is performed in combination with rotation penetration for observing the situation. That is, the penetrating rod is made to self-penetrate while increasing and decreasing the load by a unit of 250 N. When the penetrating rod does not self-penetrate only with a load of 1 KN, the penetrating rod is driven to rotate and penetrate while the load is applied. If the penetration speed of the penetration rod is increased during the rotation penetration, the rotation is stopped and the operation is switched to the self-submerged penetration in which only the load is applied. At this time, the load is generally reduced until the penetration speed becomes equal to or lower than a predetermined speed. In such a penetration test, the load value is used for self-subsidence penetration, and the half-rotation number of the penetration rod for each predetermined penetration amount (the number of rotations when one rotation of the rod is counted as 2) is used for rotation penetration. Recorded as data. After the test, a converted N value is obtained from these test data, and the proof stress of the ground can be estimated.
[0004]
The testing machine disclosed in the patent document is known to automatically execute the above-described penetration test, and based on the standard, applies a load applied to a test rod (penetration rod) as necessary. Has a mechanism that can be changed. That is, the testing machine has a first weight, a second weight, and a third weight, a clamp means for clamping the test rod to the second weight, and a rotational drive for applying a rotational driving force to the test rod. The device is arranged. Further, the first weight is suspended by a wire, and the wire is configured to be wound and fed out by a winch device.
[0005]
The first weight is placed on the second weight by gravity when the wire is loosened. The third weight is placed on the second weight by gravity before the first weight is mounted on the second weight, and the wire is wound up so that the first weight separates from the second weight. Thus, the first weight pushes up the second weight. With such a structure and operation, the test rod has three types of loads: a load by the second weight, a load by the second weight and the third weight, and a load by the first weight, the second weight and the third weight. Can be loaded.
[0006]
[Patent Document] Japanese Patent Laid-Open Publication No.
[0007]
[Problems to be solved by the invention]
However, in the structure of the testing machine shown in the patent document, the first weight and the third weight must be placed and separated from the second weight in order to change the load applied to the test rod. No. This operation involves a time loss associated with the feeding and winding of the wire by the operation of the winch device, and a time loss resulting from the structural relationship between the first weight, the second weight, and the third weight. Therefore, due to these time losses, a problem arises in that the necessary load cannot be promptly applied to the penetrating rod when required in the test machine disclosed in Patent Document.
[0008]
[Means for Solving the Problems]
The present invention has been made in view of the above problems, and an object of the present invention is to provide an automatic penetration tester capable of changing a load quickly and accurately.
[0009]
In order to achieve the above object, the present invention provides a lifting platform that can move up and down along a column, a chuck rotatably provided on the lifting platform, a chuck rotation driving unit that rotationally drives the chuck, An automatic penetration tester having a penetrating rod to be held and an elevating unit for elevating the elevating table along a column, wherein the elevating unit is capable of creating an elevating operation of the elevating table by rotation, and a rotating member, A rotary drive means for raising and lowering the rotary member, and a clutch means capable of transmitting rotation accompanying the drive of the rotary drive means for lift to the rotary member with a predetermined clutch force. .
[0010]
Preferably, the clutch means is a powder clutch, and the rotating drive means for raising and lowering is a rotating member which rotates as the penetrating rod penetrates the ground when the penetrating rod penetrates the ground. On the other hand, it is preferable to drive the transmission so that a predetermined rotational resistance is transmitted by the clutch force of the clutch means.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 5, reference numeral 1 denotes an automatic penetration tester according to a first embodiment of the present invention, which includes a lift 3 that can move up and down along a column 2 and a chuck 4 that is rotatably provided on the lift 3. A chuck rotation driving means 5 for rotating the chuck 4; a penetrating rod 6 held by the chuck 4; and a lifting unit 7 for raising and lowering the lifting table 3 along the column 2.
[0012]
The column 2 is erected on a leg 2a, and a chain member 8 is linearly arranged and fixed on the back surface thereof as an example of a guide path. A sprocket 21 of the elevating unit 7, which will be described in detail later, meshes with the chain member 8.
[0013]
The elevating platform 3 has elevating guides 9 along the rails 2b, 2b formed on both side surfaces of the column 2. The lift guide unit 9 has cam followers 9a sandwiching the rails 2b, 2b at both upper and lower ends, and realizes a smooth lifting operation of the lift table 3 along the column 2 by the rotation of the cam followers 9a. In addition, a weight 10 for adjusting the mass is disposed at a front portion of the lift 3. By adjusting the mass by the weight 10, the load based on the total mass of the lifting table 3, the chuck 4, the chuck rotation driving means 5, the lifting unit 7, and the like is adjusted to 1 KN.
[0014]
The chuck 4 is rotatably arranged on the lift 3. Its structure is basically as shown in Japanese Patent No. 2927704, and has a hollow sleeve 11 in which the penetrating rod 6 is inserted and rotatably supported. The hollow sleeve 11 is provided with a steel ball 12 which engages with a long groove 6a formed in the penetrating rod 6, and a sprocket 13 is provided below the steel ball 12. The steel ball 12 is always supported by the slide sleeve 15 urged by the spring 14 at a position protruding from the hollow hole 11a of the hollow sleeve 11, and engages with the long groove 6a of the penetrating rod 6 in this state. . When the slide sleeve 15 is pushed down against the bias of the spring 14, the steel ball 12 becomes operable, and the holding of the penetrating rod 6 can be released.
[0015]
The penetrating rod 6 includes a rod portion 16 having the above-described long groove 6a formed at an upper portion, and a drill-shaped screw point 17 connected to a tip of the rod portion 16. The rod portion 16 has a male screw portion 16a formed at the upper end and a female screw portion (not shown) formed at the lower end, and can be extended by extending one after another.
[0016]
The chuck rotation driving means 5 is an inverter motor, and can change the output torque and the rotation speed by changing the power supply frequency. A sprocket 19 is attached to the drive shaft 5a of the chuck rotation drive means 5 via a one-way clutch 18. An endless chain 20 is wound around the sprocket 19 and the sprocket 13 below the chuck 4 so that rotation can be transmitted from the chuck rotation driving means 5 to the chuck 4. The one-way clutch 18 allows the penetration rod 6 to rotate due to the soil resistance acting on the torsion-shaped screw point 17 when the penetration rod 6 self-submerges into the ground. That is, when the rotation in that direction is transmitted from the penetrating rod 6 side (the chuck 4 side), the one-way clutch 18 idles and the deceleration resistance of the chuck rotation driving means 5 does not hinder the rotation of the penetrating rod 6. Function.
[0017]
The elevating unit 7 is provided at a rear portion of the elevating table 3, and is a sprocket 21 which is an example of a rotatable member that meshes with the chain member 8 and is rotatable. And a powder clutch 23 as an example of clutch means. As the sprocket 21 of the elevating unit 7 rotates along the chain member 8, the elevating table 3 moves up and down.
[0018]
The lifting / lowering rotary drive unit 22 is an inverter motor having a built-in brake mechanism (not shown) that locks the drive shaft 22 a so that it cannot rotate when the power is cut off. By varying, it is possible to change the output torque and the number of revolutions. A gear shaft 24 integrally formed with a drive gear 24a is coaxially connected to a drive shaft 22a of the lifting / lowering rotary drive means 22. The gear shaft 24 is coaxially connected to the gear shaft 24 via a one-way clutch 25. A stopper gear 26 is mounted. The drive gear 24a is in mesh with a rotatable intermediate gear 27, and the intermediate gear 27 is in mesh with an input gear 28 mounted on the powder clutch 23.
[0019]
The powder clutch 23 has an input shaft 30 rotatably provided on a casing 29 and an output shaft 31 penetrating the input shaft 30 and rotatably provided.
The input shaft 30 has a two-part structure, in which a coupling 32 integral with the output shaft 31 is arranged with a predetermined gap. Fine magnetic powder (not shown) is sealed in these gaps. The casing 29 is provided with an electromagnet 33 for exciting the magnetic powder.
[0020]
The powder clutch 23 excites the magnetic powder by a magnetic flux generated by energizing the electromagnet 33, creates a magnetic attraction state between the magnetic powders along the magnetic flux, and generates an input force due to frictional resistance between the magnetic powders caused by the magnetic force. A predetermined clutch force is generated between the shaft 30 and the coupling 32. The magnetic attraction state of the magnetic powder varies depending on the magnitude of the magnetic flux density, that is, the amount of current supplied to the electromagnet 33. For this reason, by controlling the energization of the electromagnet 33, it is possible to change the degree of sliding between the input shaft 30 and the output shaft 31 and connect the input shaft 30 and the output shaft 31 with a predetermined clutch force. In addition, since the powder clutch 23 generates a clutch force from frictional resistance between minute magnetic powders, it is possible to obtain a very smooth change in the clutch force when the amount of current is changed.
[0021]
The input gear 28 is connected to the input shaft 30 of the powder clutch 23. With this, the input shaft 30 is connected to the ascending and descending rotary drive means 22 so as to be rotatable. One end of the output shaft 31 is connected to the sprocket 21 via a planetary gear reducer 34. Thus, the rotation by the drive of the lifting / lowering rotation drive means 22 is transmitted to the sprocket 21 by a predetermined clutch force generated by the powder clutch 23.
[0022]
The planetary gear reducer 34 includes a sun gear shaft 35 integrally connected to the output shaft 31, and three planetary gears 36 meshing with a sun gear 35 a formed at the tip of the sun gear shaft 35. A carrier 37 rotatably supports the planet gears 36. The sprocket 21 is integrally connected to the carrier 37, and receives rotation transmission reduced by the action of the sun gear 35a and the planetary gears 36. An encoder 38 is connected to the carrier 37, and is configured to output a pulse signal accompanying rotation of the sprocket 21. By analyzing the pulse signal output from the encoder 38 by a control unit (not shown), data necessary for controlling the automatic penetration test machine, such as the penetration amount of the penetration rod 6 into the ground and the penetration speed, can be obtained. .
[0023]
On the other hand, a transmission gear 39 meshing with the stopper gear 26 is integrally connected to the other end of the output shaft 31. Thus, the rotation of the sprocket 21 can be transmitted to the stopper gear 26 via the planetary gear reducer 34, the output shaft 31, and the transmission gear 39. The one-way clutch 25 interposed between the stopper gear 26 and the gear shaft 24 is provided with a sprocket 21 when the elevator 3 descends in consideration of a state in which the drive shaft 22a of the elevating rotary drive unit 22 is locked. When the rotation is transmitted from the sprocket 21 to the stopper gear 26, the rotation is locked to the gear shaft 24, and when the rotation in the opposite direction is transmitted from the sprocket 21 to the stopper gear 26, the rotation is lost with respect to the gear shaft 24.
[0024]
Next, the operation of the automatic penetration test machine 1 will be described along the procedure of the penetration test.
First, when the power is turned off before the test, the magnetic powder of the powder clutch 23 is not excited, so that the output shaft 31 is rotatable with respect to the input shaft 30. Therefore, the elevator 3 attempts to descend by its own weight, but at this time, the drive shaft 22a of the elevator rotary drive means 22 is locked so as not to rotate by the action of the brake mechanism, so that the sprocket 21 in the descending direction of the elevator 3 Is transmitted to the stopper gear 26, so that the one-way clutch 25 is locked. Therefore, the elevator 3 cannot descend. As described above, in a state where the power is cut off and the magnetic powder of the powder clutch 23 is de-energized, the lift 3 is mechanically locked, thereby preventing the lift 3 from dropping when the power is cut off. The testing machine 1 can be kept in a safe state.
[0025]
When the penetration test is started, the lift 3 is lowered to a position where the tip of the screw point 17 touches the ground under the control of the control unit. At this time, the rotation of the drive shaft 22a of the elevating rotary drive means 22 is sufficiently slower than the rotation of the sprocket 21 when the elevating platform 3 descends by its own weight. For this reason, the lift 3 descends depending on the rotation drive of the lift rotation drive unit 22.
[0026]
Subsequently, when a start switch (not shown) of the control unit is pressed, the elevating rotation drive means 22 is driven so as to rotate the sprocket 21 in the direction in which the elevating table 3 moves up (hereinafter, such elevating rotation). The driving of the driving means is called “reverse driving”, and the driving opposite thereto is called “normal driving”. Thereafter, in a situation where a load is applied to the penetrating rod 6, the rotary drive unit 22 for raising and lowering continues the reverse drive. At the same time as the driving of the elevating and lowering rotation drive means 22, the energization control of the powder clutch 23 is performed, and the clutch force of the powder clutch 23 is adjusted.
[0027]
The gear shaft 24 is idled with respect to the stopper gear 26 by the action of the one-way clutch 25 by the reverse drive of the lifting / lowering rotary drive means 22. For this reason, a load is applied to the penetrating rod 6 by the total mass of the lifting platform 3, the chuck 4, the chuck rotation driving unit 5, the lifting unit 7, the weight 10, and the like. On the other hand, since the clutch force of the powder clutch 23 is generated, the rotation resistance of the sprocket 21 due to the reverse drive of the lifting / lowering rotation drive means 22 (the force in the direction of lifting the lifting table 3; hereinafter, referred to as lifting force). Is transmitted. Therefore, a load obtained by subtracting the lifting force from the load due to the total mass of the lifting platform 3 and the like is applied to the penetrating rod 6.
[0028]
As described above, the load applied to the penetrating rod 6 is initially set to 250N, and is increased in the order of 500N, 750N, and 1KN every time the self-sinking of the penetrating rod 6 stops. That is, the load is changed by controlling the energization of the powder clutch 23 and adjusting the clutch force. Since the load of 1 KN is a load due to the total mass of the lift 3 and the like, when a load of 1 KN is applied, the powder clutch 23 is turned off so that the input shaft 30 and the output shaft 31 are in a free state. . Further, when the penetration speed of the penetration rod 6 exceeds a predetermined value under a certain load during the self-submersion penetration, the load is reduced by the energization control of the powder clutch 23 until the penetration speed becomes equal to or less than the predetermined value.
[0029]
During self-sinking, the one-way clutch 18 allows the torsion of the screw point 17 to receive the resistance of the soil so that the penetrating rod 6 can rotate. For this reason, it is possible to reduce the penetration resistance due to the resistance of the soil, and to carry out accurate self-sinking.
[0030]
When the self-sinking penetration of the penetrating rod 6 stops under a load of 1 KN, the chuck rotation driving means 5 is driven while maintaining the load state, and the rotational penetration of the penetrating rod 6 is performed.
In this rotational penetration, since the steel ball 12 is engaged with the long groove 6a of the penetration rod 6, slippage does not occur between the penetration rod 6 and the chuck 4, so that the rotation from the chuck 4 to the penetration rod 6 is ensured. It is possible to communicate. During the rotation penetration, if the penetration speed exceeds a predetermined value, the chuck rotation driving means 5 is stopped, and is switched to the self-submersion penetration.
[0031]
As described above, the penetration test is performed while switching between self-depressing penetration and rotating penetration.
On the way, a rod portion 16 is sequentially added to the penetrating rod 6. When the rod portion 16 is added, the elevating and lowering rotation drive means 22 and the chuck rotation drive means 5 are stopped, and an extension rod portion (not shown, but having the same configuration as the rod portion 16) is added to the rod portion 16. Then, the slide sleeve 15 of the chuck 4 is pushed down and rotated to release the steel ball 12 from the long groove 6a to release the holding of the penetrating rod 6. At this time, since the one-way clutch 18 operates, the chuck 4 can be easily rotated.
In this state, the elevating rotary drive means 22 is driven forward to raise the elevating table 3 until the steel ball 12 of the chuck 4 is at the same height as the long groove of the extending rod portion. If the phases of the steel ball 12 and the long groove coincide with each other at this position, the steel ball 12 engages with the long groove, and the slide sleeve 15 receives the urging force of the spring 14 and returns upward to hold the steel ball 12. Then, the holding of the penetrating rod 6 is automatically completed. If the steel ball 12 and the long groove are out of phase, the chuck rotation driving means 5 is driven to rotate the chuck 4 at a low speed to engage the steel ball 12 with the long groove.
[0032]
During the penetration test, in the control unit, the amount of penetration and the load value of the penetration rod 6 at that time are recorded every time the load is changed in the case of self-subsidence penetration, and in the case of rotary penetration, the penetration rod 6 penetrates 250 mm. The required half revolutions are recorded every time. This test data is used as basic data for determining the strength of the ground after the test.
[0033]
In both cases of self-sinking and rotary penetration, the penetration rod 6 may not be able to penetrate when it hits underground rock, debris, or the like. In this case, the rotation drive unit 22 for raising and lowering and the chuck rotation drive unit 5 may be temporarily stopped, and the penetration rod 6 may be hit and penetrated. At this time, the penetrating rod 6 is held by the chuck 4 by the engagement of the steel ball 12 with the long groove 6a, so that the penetrating rod 6 can move in the axial direction with respect to the chuck 4 by the length of the long groove 6a. Therefore, it is possible to prevent the impact due to the impact from being transmitted to the chuck 4, the lift 3 and the like. The penetrating rod 6 has a required gap with the hollow hole 11a of the chuck 4 other than being supported by the steel ball 12. For this reason, the penetration rod 6 can swing about the supporting position of the steel ball 12 as a fulcrum. This contributes to improving the avoidance performance when the vehicle hits debris or the like while penetrating into the ground, and preventing the load from being transmitted to the chuck 4 or the like at that time.
[0034]
The automatic penetration tester 1 adjusts the load applied to the penetration rod 6 by the clutch force generated by the powder clutch 23. Therefore, it is recommended to calibrate the load periodically. In this load calibration, first, the penetrating rod 6 is brought into contact with a load meter (not shown) such as a load cell, and in this state, the rotation drive means 22 for raising and lowering is reversely driven to control the power supply to the powder clutch 23. Then, the amount of power supplied to the powder clutch 23 is appropriately adjusted according to the value of the load meter.
[0035]
The automatic penetration tester 1 transmits to a sprocket 21 an ascending force due to reverse driving of the ascending and descending rotary drive means 22 by a clutch force of a powder clutch 23.
Therefore, in the above-mentioned load calibration, in both the method of proceeding the calibration of the load from the light load to the heavy load sequentially and the method of proceeding the calibration of the load from the heavy load to the light load sequentially, without raising and lowering the lift 3 Calibration work can be performed. That is, load calibration can be performed in various load increase / decrease patterns without moving the lift 3 up and down. For this reason, high-precision load calibration can be performed, and since the elevator 3 does not perform the lifting operation, silence and safety at the time of the load calibration work can be improved.
[0036]
FIG. 6 shows the structure of the lifting unit 7 'in the automatic penetration tester according to the second embodiment of the present invention. The lifting unit 7 'is constructed by removing the one-way clutch 25, the stopper gear 26, and the transmission gear 39 in the automatic penetration tester 1, and connecting the brake means 40 to the output shaft 31 of the powder clutch 23. The brake means 40 is a friction brake mechanism that generates a locking action when the energization to the lifting / lowering rotary drive means 22 is interrupted.
[0037]
In the automatic penetration tester equipped with the lifting unit 7 ', the total of the lifting table 3 and the like is controlled by switching between forward and reverse driving of the lifting and lowering rotation driving means 22 and adjusting the clutch force by controlling the energization of the powder clutch 23. A load greater than the load due to mass can be applied to the penetrating rod 6. As an example, consider an automatic penetration tester in which the lift 3 and the like are reduced in weight so that the load due to the total mass of the lift 3 and the like is 500 N. In this automatic penetration tester, when a load of up to 500 N is applied, the powder clutch 23 is energized while driving the elevating rotary drive means 22 in reverse, and when the load exceeding 500 N is applied, the elevating rotary drive means 22 is used. , The powder clutch 23 is energized. Thus, the load up to 500N is given by the same principle as described above. For loads exceeding 500N, the positive drive of the rotary drive means 22 for lifting and lowering and the clutch force of the powder clutch 23 are reduced to a load of 500N due to the mass of the lift 3 or the like. And the pressing force in the descending direction of the lifting platform caused by the above is added.
[0038]
In the automatic penetration tester equipped with the lifting unit 7 ', when the penetration rod 6 cannot penetrate into the underground rock or debris, the input shaft 30 and the output shaft 31 are locked before hitting. It is preferable that the rotation drive means 22 for raising and lowering be driven forward while the power supply to the powder clutch 23 is controlled in such a manner. As a result, since the penetrating rod 6 is pressed in the penetrating direction, when rocks, debris, and the like are relatively brittle, they can be crushed and the penetrating rod 6 can continue to penetrate without being hit. .
[0039]
Fig. 7 shows an automatic penetration tester 1 'of the third embodiment of the present invention, and Fig. 8 shows an automatic penetration tester 1 "of the fourth embodiment of the present invention. Each has a winch device 70 capable of winding and unwinding a wire 71 as an elevating unit.In the automatic penetration tester 1 ', the winch device 70 is mounted on the elevating platform 3' and the wire 71 is In the automatic penetration tester 1 ", the winch device 70 is installed at the lower part of the column 2 and the wire 71 is connected to the lift 3". ', 1 ", the load due to the total mass of the elevators and the like is set to 1 KN.
[0040]
Since the structure of the winch device 70 is the same, it will be described with reference to FIG. As shown in the figure, the winch device 70 has a rotating drum 72 as an example of a rotating member to which one end of the wire 71 is connected, and a lifting / lowering rotating drive unit 22 capable of driving the rotating drum 72 to rotate. The rotating drum 72 and the ascending and descending rotary drive unit 22 are connected via a powder clutch 23 which is an example of a clutch unit. That is, the drive shaft 22 a of the lifting / lowering rotary drive unit 22 is connected to the input shaft 30 of the powder clutch 23, and the rotary drum 72 is connected to the output shaft 31 of the powder clutch 23. The output shaft 31 of the powder clutch 23 is connected to a brake means 40 which locks when the power supply to the elevating rotary drive means 22 is cut off.
[0041]
In the automatic penetration test machine 1 ', 1 "having the above-described configuration, the clutch force is changed by controlling the energization of the powder clutch 23 to change the load applied to the penetration rod 6, similarly to the automatic penetration test machine 1. When the powder clutch 23 is off, the output shaft 31 is rotatable with respect to the input shaft 30, and a load of 1 KN is applied to the penetrating rod 6 due to the total mass of the lifting platform 3. The penetrating rod receives a load lighter than 1 KN. When the load is applied to 6, the energization control of the powder clutch 23 is performed while the lifting / lowering rotation drive unit 22 is driven to rotate the rotary drum 72 in the direction in which the wire 71 is wound.
Thus, the lifting force according to the clutch force of the powder clutch 23 is transmitted to the lifting platform 3 '(or 3 "), and the load applied to the penetrating rod 6 can be changed.
[0042]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the automatic penetration tester of this invention, by adjusting the clutch force of a clutch means, a load can be changed very quickly and accurately, and there exists an advantage that a highly accurate penetration test result can be obtained. In addition, even when the penetrating rod collides with something and cannot penetrate it, the load applied to the penetrating rod can be increased or decreased, so that the load can be calibrated with the lifting platform stopped at a predetermined position. Therefore, there are advantages that the time required for load calibration can be shortened and that the load calibration operation can be performed safely. In addition, since it is possible to apply a load greater than the equipment mass including the lifting platform, chuck, and lifting unit to the penetrating rod, it is possible to reduce the weight of the lifting platform, etc., thereby realizing a lightweight automatic penetration tester. It is possible.
[Brief description of the drawings]
FIG. 1 is an enlarged partial cutaway cross-sectional view of a main part taken along line CC of FIG.
FIG. 2 is a front view of the automatic penetration tester according to the first embodiment of the present invention.
FIG. 3 is an enlarged sectional view taken along line BB of FIG. 2;
FIG. 4 is an enlarged partial cutaway sectional view of a main part of the automatic penetration tester according to the first embodiment of the present invention.
FIG. 5 is an enlarged partial cutaway sectional view of an essential part according to AA in FIG. 2;
FIG. 6 is an enlarged partial cutaway sectional view of a main part of an automatic penetration tester according to a second embodiment of the present invention.
FIG. 7 is a front view of an automatic penetration tester according to a third embodiment of the present invention.
FIG. 8 is a front view of an automatic penetration tester according to a fourth embodiment of the present invention.
FIG. 9 is an explanatory cross-sectional view of a winch device in the automatic penetration tester according to the third and fourth embodiments of the present invention.
[Explanation of symbols]
1 automatic penetration tester
2 props
3 elevator
4 Chuck
5 Chuck rotation drive means
6 Penetrating rod
6a Long groove
7 Lifting unit
8 Chain members
10 weight
11 Hollow sleeve
12 Steel ball
13 Sprocket
14 Spring
15 Slide sleeve
16 Rod part
17 Screw Point
18 One-way clutch
19 Sprocket
20 Endless chain
21 sprockets
22 Elevating rotary drive means
23 Powder Clutch
24 Gear shaft
24a drive gear
25 One-way clutch
26 Stopper gear
27 Intermediate gear
28 Input gear
29 Casing
30 input shaft
31 Output shaft
32 coupling
33 Electromagnet
34 planetary gear reducer
35 sun gear shaft
35a sun gear
36 planetary gear
37 career
38 Encoder
39 Transmission gear

Claims (3)

A lifting table that can be raised and lowered along a column, a chuck rotatably provided on the lifting table, chuck rotation driving means for rotating the chuck, a penetrating rod held by the chuck, and a column An automatic penetration tester having an elevating unit for elevating and lowering along
The lifting unit,
A rotating member that can create a lifting operation of the lifting platform by rotation,
An elevating and lowering rotary drive means capable of driving the rotary member to rotate,
An automatic penetration tester comprising: clutch means capable of transmitting the rotation accompanying the drive of the elevating rotation drive means to the rotating member with a predetermined clutch force. 2. The automatic penetration tester according to claim 1, wherein the clutch means comprises a powder clutch. When the penetrating rod penetrates into the ground, the rotary drive means for raising and lowering transmits a predetermined rotational resistance to a rotating member that rotates as the penetrating rod penetrates into the ground by the clutch force of the clutch means. The automatic penetration tester according to claim 1 or 2, wherein the automatic penetration tester is driven.

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