JP2023117435A - Penetration rod disconnection device - Google Patents

Abstract

To provide a penetration rod disconnection device which can simply separate a rod used in a penetration testing machine.SOLUTION: A penetration rod disconnection device 100 includes a chuck 5 capable of rotatably holding a penetration rod 4 accompanying driving of a motor 6, and is used in a penetration testing machine that is configured to rotatably penetrate a rod 104a for extension into the ground while sequentially extending the rod 104a for extension by screw connection. The penetration rod disconnection device 100 includes a device body 110 capable of holding the extended rod for extension, and fixing means 120 for regulating rotation of the device body by being fixed to the penetration testing machine 1, and is configured to release screw connection of the rod by driving the motor of the chuck and rotating the penetration rod.SELECTED DRAWING: Figure 6

Description

The present invention relates to a penetrating rod decoupling device for decoupling a rod used in a penetration test in which a penetrating body is inserted into the ground while successively adding rods to a penetrating rod provided with a penetrating body at the tip of the rod.

Conventionally, there is one shown in Patent Document 1 as an example of a penetration tester. This penetration tester is for conducting a Swedish sounding test, which is an example of a penetration test. is configured to The penetrating rod is engaged and held by a chuck provided on a lifting table that can be raised and lowered by driving a motor, and the screw point at the tip penetrates into the ground as the lifting table descends. When the platform reaches the lowest point, the worker adds the next rod to the rear end of the rod by screw connection. Then, the engagement of the penetration rod and the chuck is released, the lifting table is raised, and the lifting table is lowered again while the rod added to the chuck is engaged and held to penetrate the screw point to a deeper depth. The screw point is penetrated to a predetermined depth while repeating such rod connecting work.

After the test is completed, the rod is pulled out from the ground by raising the platform while the penetration rod and chuck are engaged, and the operator releases the connection of the rod. Since the connecting portions of the rods are tightly connected by screws, the worker uses a pipe wrench to release the connection.

Japanese Patent Application Laid-Open No. 2004-92202

However, handling a pipe wrench is difficult for beginners and requires skill. In this way, the work of disconnecting the rod has a problem in terms of workability.

SUMMARY OF THE INVENTION An object of the present invention is to provide a penetration rod decoupling instrument that can easily disconnect a rod used in a penetration tester.

The above problem is a penetration tester equipped with a chuck capable of rotatably holding a penetration rod in accordance with the drive of a motor, and configured to rotate and penetrate into the ground while sequentially extending the extension rod by screw connection. A penetration rod disconnecting instrument used for , comprising an instrument body capable of holding a spliced extension rod, and a fixing means fixed to a penetration tester and regulating the rotation of the instrument body, and a chuck motor A solution can be provided by a penetration rod decoupling device that is configured to detach the threaded connection of these rods by driving them to rotate them.

The instrument body includes a hollow chuck shaft having an inner hole through which an extension rod can be inserted, a sleeve reciprocally movable along the chuck shaft and always biased toward the chuck shaft end side, and a chuck shaft end side of the sleeve. and a steel ball arranged on the chuck shaft and always supported by the sleeve so as to protrude into the inner hole of the chuck shaft. The steel ball is fitted into the formed engagement groove, and the engagement groove and the steel ball are disengaged by pushing down the sleeve so that the steel ball can be attached to and detached from the extension rod. is preferred.

INDUSTRIAL APPLICABILITY The penetration rod decoupling device of the present invention can be easily decoupled from the penetration rod by simply attaching it to the penetration tester without direct intervention by the operator.

It is a perspective view of an automatic penetration tester. It is a side view of an automatic penetration tester. FIG. 3 is an enlarged partially cutaway cross-sectional view taken along the line AA of FIG. 2; Fig. 2 is an enlarged, partially cutaway cross-sectional view of a main part showing the configuration of the chuck of the automatic penetration tester; It is a figure which shows the structure of a load sensor. FIG. 10 is a diagram showing the configuration of the penetration rod decoupling instrument of the present invention;

First, a penetration tester using the penetration rod disconnecting instrument 100 of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes an automatic penetration tester, which has a lifting platform 3 that can be lifted and lowered along a support 2. As shown in FIG. The lifting table 3 includes a weight 3a having a predetermined weight, a rotating motor 6, a chuck 5 rotatable by receiving the drive of the rotating motor 6, and a penetrating device which is held by the chuck 5 and can rotate integrally. A rod 4 and an elevating motor 8 for raising and lowering the platform 3 are loaded.

The penetration rod 4 is composed of a rod 4a and a screw point 4b connected to its tip (lower end). The rod 4a has three engaging grooves 4c at positions dividing the outer circumference of the upper end into three equal parts, and also has three engaging grooves 4d at positions dividing the outer circumference into three equal parts at the lower end. .

As shown in FIG. 2, the lifting platform 3 has a sprocket 7 rotating along a guide chain 2a arranged vertically along the column 2, and the sprocket 7 rotates along the guide chain 2a. It is configured to be raised and lowered by Due to the lifting table 3 and the above-mentioned total weight loaded on the lifting table 3, the penetration rod 4 is constructed so that a load of 1 KN can be applied.

As shown in FIG. 3, the sprocket 7 is connected to a transmission shaft 12 via a planetary gear mechanism 11 so as to rotate together. A drive gear 13 is attached to the tip of the drive shaft 8a of the lift motor 8, which can be rotated forward and backward, so as to rotate integrally with the drive shaft 8a. Furthermore, an intermediate gear 14 and a transmission gear 15 are meshed with the drive gear 13 in order, and are configured to transmit the drive of the lifting motor 8 to the transmission shaft 12 .

Further, the transmission gear 15 is a hollow cylinder having external teeth on its outer peripheral surface. A one-way clutch 16 is press-fitted into the transmission gear 15 so as to rotate together with the transmission gear 15 and is rotatably supported by the transmission shaft 12 . The first one-way clutch 16 causes the lifting motor 8 to rotate the sprocket 7 in the direction in which the lifting table 3 is to be raised (for convenience, this drive is forward rotation). 8 drive is transmitted. With this configuration, a load determined by (the load based on the total gravity of the lifting platform) - (the lifting force corresponding to the output torque of the lifting motor 8) is applied to the penetration rod 4 as a test load.

On the other hand, when the lifting motor 8 is driven (for convenience, this driving is referred to as reverse driving), the one-way clutch 16 is idly rotated. As a result, it is possible to create a state in which the drive of the lifting motor 8 is not transmitted to the transmission shaft 12, and the penetration rod 4 can be loaded with 1KN (maximum test load) based on the mass of the lifting platform.

A rotary encoder 17 is attached to the transmission shaft 12 and outputs a pulse signal accompanying the rotation of the sprocket 7 . Then, the control unit 50, whose details will be described later, processes the pulse signal, and calculates the penetration amount, the penetration speed, etc. of the penetration rod 4 based on the elevation amount and the elevation speed of the lifting table 3.

The lifting motor 8 is an induction motor and is driven and controlled by the inverter control section 53 . A driving pulley 18 is attached to the rear end of the driving shaft 8a of the lifting motor 8 so as to be integrally rotatable. A driven pulley 19 is arranged at a predetermined distance from the driving pulley 18, and an endless belt 20 is wound around the pulleys 18,19. A rotary encoder 21 is attached to the driven pulley 19 as acceleration detection means for the lifting motor 8, and is configured to detect a pulse signal associated with the rotation of the driving shaft 8a of the lifting motor 8. . A pulse signal from the rotary encoder 21 is sent to the inverter control section 53 and the arithmetic processing section 51 of the lifting motor 8 .

Equivalent functions can be realized by using an AC servomotor instead of the induction motor and providing a drive control unit conforming to the AC servomotor.

As shown in FIG. 4, the chuck 5 includes a hollow chuck shaft 31 rotatably supported by bearings 45, 46, 47 and 48, and a machine key (not shown) inserted into the chuck shaft 31. and a flange-type sleeve 32 that The sleeve 32 is constantly biased upward by a spring 33 and is configured to be movable while sliding on the outer peripheral surface of the chuck shaft 31 . On the other hand, it is configured to rotate integrally with the chuck shaft 31 in the circumferential direction. Further, the chuck shaft 31 is provided with storage holes capable of accommodating the steel balls 34 at positions dividing the outer circumference into three equal parts. This steel ball 34 fits into the engagement groove 4c of the penetration rod 4 to hold the penetration rod 4. As shown in FIG. The inner diameter of the upper portion of the sleeve 32 is formed to be larger than the inner diameter of the chuck shaft 31 , and when the sleeve 32 is manually pushed down against the bias of the spring 33 , the steel ball 34 engages the penetration rod 4 . It is removed from the groove 4c. Further, in this state, when the chuck shaft 31 is rotated together with the sleeve 32 and the steel ball 34 is moved to a position where the engagement groove 4c of the penetration rod 4 is not formed, even if the sleeve 32 is released, the penetration rod 4 will not move. The engagement with the chuck shaft 31 is released.

An annular pressing member 32 a is inserted into the chuck shaft 31 and fixed to the chuck shaft 31 . The pressing member 32a is formed to have the same inner diameter as the sleeve 32, and is configured to press the sleeve 32 from above to prevent it from coming off. Further, the pressing member 32a is arranged so as to protrude from the upper end of the chuck shaft 31, the reason for which will be described later.

A motor 6 for rotation is mounted on the lift table 3 . The rotation motor 6 is an induction motor and is driven and controlled by the inverter control section 54 . A driving sprocket 36 is attached to the drive shaft 6a of the rotation motor 6 via a one-way clutch 35. As shown in FIG. Further, a driven sprocket 37 is attached to the lower end of the chuck shaft 31 , and an endless chain 38 is wound around these sprockets 36 and 37 so that the rotational drive of the rotation motor 6 can be transmitted to the chuck shaft 31 . there is

Here, the screw point 4b at the tip of the penetration rod 4 has a drill shape that is twisted once with respect to a length of 200 mm, as shown in Japanese Industrial Standard A1221. Therefore, the one-way clutch 35 is driven by the rotation motor 6 in the direction in which the penetration rod 4 is screwed into the ground according to the twist of the screw point 4b (hereinafter, for convenience, this drive is referred to as normal rotation drive). It transmits drive to the driving sprocket 35 . On the other hand, when the rotating motor 6 is driven in the opposite direction (hereinafter, this driving is referred to as reverse driving for convenience), the driving is not transmitted to the penetration rod 4 because it idles.

A washer type load cell 39 is inserted in the chuck shaft 31 as an example of a load sensor. As shown in FIG. 5, the washer-type load cell 39 includes pressure receiving portions 41 formed on the lower surface of the sensor main body 40 at equal intervals in the circumferential direction, and pressure receiving portions 41 formed on the upper surface of the sensor main body 40 at equal intervals in the circumferential direction. It is composed of a support portion 42 formed at intervals and a strain gauge 43 attached to the sensor main body 40 . With this configuration, the thrust load actually applied to the penetration rod 4 is transmitted to the pressure receiving portion 41 via the angular ball bearings 45 and 46 and the cylindrical roller bearing 47 that support the chuck shaft 31, and the support portion 42 receives pressure accordingly. It becomes a fulcrum with respect to the plate 44 and the sensor main body 40 is distorted. By detecting this strain with the strain gauge 43, the load applied to the penetration rod 4 can be detected with high accuracy.

As shown in FIG. 2, the control unit 50 that performs the operation and load control of the automatic penetration tester 1 of the present invention includes an arithmetic processing unit 51, an inverter control unit 53 that drives and controls the lifting motor 8, a rotation motor , a storage unit 55, and an input unit 56.

A torque command value corresponding to a test load is stored in the storage unit 55, and the arithmetic processing unit 51 selects the torque command value when setting a predetermined test load. Then, this torque command value is output to the inverter control unit 53, and the lifting motor 8 exerts a lifting force according to the torque command value, thereby applying a predetermined test load to the penetration rod 4. there is

The inverter control section 53 drives and controls the elevation motor 8 so that the elevation motor 8 is driven by the torque command value output from the arithmetic processing section 51 . Specifically, the inverter control unit 53 controls the rotation speed and the output torque of the lifting motor 8 by vector control based on the pulse signal of the rotary encoder 21 .

The arithmetic processing unit 51 calculates the rotational acceleration of the drive shaft 8a of the elevator motor 8 based on the pulse signal from the rotary encoder 21 of the elevator motor 8. FIG.

Next, the operation of the automatic penetration tester 1 will be described. In the automatic penetration tester 1, the load applied to the penetration rod 4 is set to six levels of values of 50N, 150N, 250N, 500N, 750N, and 1KN according to the Swedish sounding test. For example, when the penetration speed slows down with a load of 250 N, the load applied to the penetration rod 4 is increased. On the other hand, when the penetration speed increases, the load applied to the penetration rod 4 is reduced. Thus, the command value is changed so that the load increases in the order of 500N, 750N, and 1KN each time the penetration speed slows down in the penetration stage. Then, when a load of 1 KN is applied and the penetration speed becomes slow, the rotation motor 6 is driven to rotate the chuck 5 and the penetration rod 4 together, and rotary penetration is performed while the load is applied. will be

Further, during the penetration test, when the lifting platform 3 reaches the ground surface and the full length of the penetration rod 4 penetrates into the ground, the extension rod 104a is added to the rear end of the penetration rod 4.

The extension rod 104a has the same configuration as the rod 4a of the penetration rod 4. As shown in FIG. Moreover, both the rod 4a of the penetration rod 4 and the extension rod 104a are formed with a female threaded portion at the tip and a male threaded portion at the rear end. With this configuration, the female threaded portion of the extension rod 104 a is screwed into the male threaded portion at the rear end of the penetration rod 4 . Then, the engagement between the penetration rod 4 and the chuck 5 is released, the lifting table 3 is raised, and the steel balls 34 of the chuck 5 are fitted into the engagement grooves 104c of the extension rod, thereby completing the extension. By lowering the platform 3 again, the screw point 4b is penetrated to a deeper depth. While repeating such rod connecting work, the screw point 4b is penetrated to a predetermined depth.

After the end of the test, the extension rod 104a is pulled out from the ground by raising the lifting table 3 while the extension rod 104a and the chuck 5 are engaged with each other. Then, the engagement between the extension rod 104a and the chuck 5 is released, the lifting table 3 is lowered to the position of the lower penetration rod 4, and the engagement groove 4c of the rod 4a of the penetration rod 4 (or the extension rod The steel ball 34 of the chuck 5 is fitted into the engagement groove 104c) of 104a. The penetration rod decoupling instrument 100 of the present invention is now attached to the upper extension rod 104a.

The penetration rod disconnecting instrument 100 of the present invention comprises an instrument body 110 and fixing means 120 for fixing the instrument body 110 to the automatic penetration tester 1, as shown in FIG.

The instrument main body 110 has the same structure as the chuck 5, and is composed of a hollow chuck shaft 131 having a through-hole through which the extension rod 104a can be inserted, and a sleeve 132 fitted around the chuck shaft 131. ing. The sleeve 132 is constantly biased upward by a spring 133 and is configured to be movable while sliding on the outer peripheral surface of the chuck shaft 131 . On the other hand, it is configured to rotate integrally with the chuck shaft 131 in the circumferential direction.

The chuck shaft 131 of the tool body 110 is provided with storage holes capable of storing steel balls 134 at positions dividing the outer circumference into three equal parts. The steel ball 134 is engaged with an engagement groove 104d formed on the outer peripheral surface of the lower end of the extension rod 104a to hold the extension rod 104a. The inner diameter of the upper portion of the sleeve 132 is larger than the inner diameter of the chuck shaft 131. When the sleeve 132 is manually pushed down against the force of the spring 133, the steel ball 134 engages the extension rod 104a. It is configured to be separated from the matching groove 104d.

The fixing means 120 is a block member connected to the lower part of the instrument body 110 and has a communication hole 121 communicating with the through hole of the chuck shaft 131 of the instrument body 110 . Moreover, the fixing means 120 has a holding groove 122 that can be fitted to the frame 101 provided on the platform 3 . For convenience, the frame 101 is not shown in drawings other than FIG.

Further, the fixing means 120 has a spigot portion 123 at the opening of the communication hole 121 and is configured to be positioned on the upper end of the chuck shaft 31 .

As described above, the method of using the penetration rod disconnection device 1 is as follows. The device main body 110 of the rod disconnecting device 100 is mounted, and the fixing means 120 is fixed to the frame 101 of the lifting platform 3 .

In this state, driving the rotation motor 6 to rotate the chuck 5 causes the lower penetration rod 4 to rotate. On the other hand, since the upper extension rod 104a is rotationally fixed by the penetrating rod decoupling tool 100, the threads connecting these rods are unscrewed.

When the sleeve 132 is manually pushed down against the force of the spring 133 after the screwing is released, the steel ball 134 is disengaged from the engagement groove 104d of the extension rod 104a. When the engagement groove 104d of the extension rod 104a is rotated manually to a position where the steel ball 134 is absent, the engagement between the extension rod 104a and the chuck shaft 131 is released even if the sleeve 132 is released. In this state, the extension rod 104a can be removed from the instrument main body. Remove the penetration rod connection release device 1 from the automatic penetration tester 1, repeat the predetermined withdrawal operation by the automatic penetration tester 1 again, and use the penetration rod connection release device 100 each time to sequentially connect the extension rod 104a. can be released.

1 Automatic Penetration Tester 2 Post 2a Guide Chain 3 Lifting Table 3a Weight 4 Penetration Rod 4b Screw Point 4c Engagement Groove 5 Chuck 6 Rotation Motor 6a Drive Shaft 8 Lifting Motor 8a Drive Shaft 11 Planetary Gear Mechanism 12 Transmission Shaft 13 Drive Gear 14 Intermediate gear 15 Transmission gear 16 One-way clutch 17 Rotary encoder 18 Drive pulley 19 Driven pulley 20 Endless belt 21 Rotary encoder 31 Chuck shaft 32 Sleeve 32a Holding member 33 Spring 34 Steel ball 35 One-way clutch 36 Drive sprocket 37 Driven sprocket 38 Endless chain 39 Washer-type load cell 40 Load cell body 41 Pressure receiving part 42 Support part 43 Strain gauge 44 Pressure receiving plates 45, 46 Angular ball bearings 47, 48 Cylindrical roller bearing 50 Control unit 51 Arithmetic processing part 53 Inverter control part 54 Inverter control part 55 Memory Part 56 Input part 100 Penetration rod decoupling tool 101 Frame 104a Extension rods 104c, 104d Engagement groove
110 Tool body 120 Fixing means 121 Communication hole 122 Holding groove 123 Inlay part 131 Chuck shaft 132 Sleeve 133 Spring 134 Steel ball

Claims (2)

It is used in a penetration tester that is equipped with a chuck that can rotatably hold a penetration rod in accordance with the drive of a motor, and that rotates and penetrates the ground while extending the extension rod by successively connecting it with screws. A penetration rod decoupling instrument, comprising:
a device body capable of holding the spliced extension rod;
Fixing means for fixing to the penetration tester and restricting rotation of the instrument body;
with
configured to drive a motor of the chuck to rotate the penetration rods to disengage the threaded connection of the rods;
A penetration rod decoupling instrument, comprising: The instrument body
a hollow chuck shaft having an inner hole through which the extension rod can be inserted;
a sleeve reciprocally movable along the chuck shaft and always biased toward the end of the chuck shaft;
a sleeve retainer that restricts movement of the sleeve toward the chuck shaft end;
a steel ball arranged on the chuck shaft and always supported by the sleeve so as to protrude into an inner hole of the chuck shaft;
with
The steel balls are fitted into the engagement grooves formed on the outer peripheral surfaces of both ends of the extension rod, and the sleeves are pushed down to disengage the engagement grooves and the steel balls. 2. The penetration rod decoupling instrument of claim 1, wherein the penetration rod decoupling instrument is configured to be detachable from.

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