JPH11251030A - Hydraulic crimping tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydraulic crimping tool equipped with a crimp confirmation mechanism to prohibit a next crimping work by automatically stopping a crimping work, if the crimping work to produce a prescribed crimp size is not carried out in the crimping work for a cable connection etc. SOLUTION: In a hydraulic crimping tool A in which a cylindrical cylinder part 3 and a jaw shaped head part 1 are integrally formed, a piston 2 with a movable die 4 fitted is slidably inserted in the cylinder part 3, a fixed die 7 is fixed onto the head part 1 at a position opposing to the movable die 4, and a material W to be crimped is crimped by the movable die 4 and the fixed die 7, a crimp confirmation mechanism 20 is mounted on the head part 1 to stop a reciprocating operation of the piston 2 if a crimp size of the material is detected and it is less than a designated one.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic compression tool used for crushing a wire or the like having a large diameter for power transmission via a sleeve to connect the wires.

[0002]

2. Description of the Related Art Conventionally, a hydraulic compression tool B of this type has a structure shown in FIG.
As shown in FIG. 5, a jaw-shaped head portion 50 in which one side is bent in a substantially arc shape and the other side is bent in a substantially U-shape, and a cylinder 51 screwed to the head portion 50, A piston 52 is slidably housed inside the cylinder 51. A return spring 53 is externally fitted to the piston 52, and a movable die 54 is attached to a tip end thereof. A fixed die 55 is mounted on the U-shaped bent portion of the head 50 at a position facing the movable die 54. The base of the piston 52 is integrally formed with a stepped portion 52a having a large diameter and an oil chamber 56. A groove 52b formed on the peripheral surface of the stepped portion 52a has a O-ring 57 for preventing leakage of pressurized oil. And the backup ring 58 are inserted.

[0003] The hydraulic compression tool B thus configured is
A coupler 59 is provided from a hydraulic source provided in a work vehicle (not shown) or the like.
When the hydraulic oil is sent to the oil chamber 56 and discharged into the oil chamber 56, the piston 52 moves forward, so that the movable die 54 moves toward the fixed die 55 and is inserted between the movable die 54 and the fixed die 55. This is for compressing the material to be compressed W.

[0004]

However, in the above-mentioned conventional hydraulic compression tool B, even if the movable die 54 is not compressed to a specified size for some reason, the output applied to the movable die 54 is kept at a predetermined level. Output (10
30 tons), the hydraulic pressure of the piston 52 for compressing the material to be compressed W is released, and the piston 52
Automatically returns, and the compression process ends.
Workers need to check the end of work each time,
Since this inspection is difficult, there has been a problem that inspection and management of the hydraulic compression tool and the hydraulic supply source must be completely performed, and that much labor is required for the inspection and management. In addition, since the size difference between the good product and the defective product in this compression work after compression is 1 mm or less, there is a possibility that the defective product may be missed even during inspection, and if this defective product is overlooked and used for a long time with electric wires etc. In addition, there is a possibility that heat is generated from the connection portion, or the wire is disconnected and disconnected.

The present invention has been made in view of such a situation. In the compression work of electric wires and the like, if the compression work is not performed as specified, the compression work is automatically stopped and the next compression work is performed. It is an object of the present invention to provide a hydraulic compression tool having a compression confirmation mechanism for prohibiting work.

[0006]

In order to achieve the above object, according to the present invention, a cylindrical cylinder portion and a jaw-shaped head portion are integrally formed, and a movable die is fitted to the cylinder portion. A piston is slidably inserted, a fixed die is fixed to the head portion at a position facing the movable die, and the hydraulic compression tool performs compression of the material to be compressed by the movable die and the fixed die. Detecting the compression size of the material to be compressed, if less than a predetermined compression size,
A compression confirmation mechanism for stopping the reciprocating operation of the piston is mounted on the head portion.

[0007] The compression confirmation mechanism may include a rack member attached to the piston, a spur gear meshing with the rack member, a ratchet gear coaxially mounted on the spur gear, and a substantially triangular shape. The center part is provided with a vertex formed with a ratchet pawl that engages with the ratchet gear, a vertex formed with an engaging groove that engages with the switching pawl, and a vertex formed with an elliptical hole that engages with the switching lever. A ratchet member rotatably supported, a switching claw engaging the engagement groove of the ratchet member to fix the ratchet member, and a ratchet member engaging the elliptical hole of the ratchet member via an engagement pin. And a release shaft for releasing the engagement between the ratchet member and the ratchet gear. Further, the release shaft includes a truncated cone-shaped tip portion, an intermediate portion having a diameter larger than the tip portion, and a head portion having a diameter larger than the intermediate portion, and the intermediate portion is engaged with a stopper piece. That is, two engagement grooves are formed.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing a hydraulic compression tool according to the present invention, FIG. 2 is an enlarged view of a part of the hydraulic compression tool shown in FIG. FIG. 4 is an explanatory view of the operation of the confirmation mechanism, FIG. 4 is an explanatory view of the operation of the compression confirmation mechanism of the hydraulic compression tool of FIG. 1, FIG. 5 is an explanatory view showing a release axis of the hydraulic compression tool of FIG. 1, and FIG. It is explanatory drawing which shows the release operation | movement of the release axis | shaft of the hydraulic compression tool of FIG.

As shown in FIG. 1, a hydraulic compression tool A according to the present invention has a jaw-shaped head portion 1 having a substantially arcuate shape on one side and a substantially U-shape on the other side at the distal end. And a cylindrical cylinder portion 3 accommodating the piston 2 are integrally formed.
A movable die 4 is mounted on the tip of the piston 2. A fixed die 7 is attached to the U-shaped bent portion of the head 1 at a position facing the movable die 4.
At the base end side of the hydraulic compression tool A, a mounting portion 5 for mounting to an arm such as a work manipulator (not shown), and a hydraulic hose for sending hydraulic oil to the hydraulic compression tool A from a hydraulic source (not shown) And the coupler 6 connected to
They are connected via a universal joint 16. Also, since the hydraulic compression tool A is used for compressing live wires and the like, the entirety is covered with an insulating cover 17 made of rubber or the like.
Further, on the side surface of the head portion 1, the compression size of the material W to be compressed by the movable die 4 and the fixed die 7 is detected, and when the compression size is less than a predetermined compression size, the compression for stopping the reciprocating operation of the piston is stopped. The confirmation mechanism 20 is mounted.

As shown in FIG. 2, the inside of the cylinder portion 3 is formed in a cylindrical chamber 3a having a cylindrical base with a large-diameter stepped hole, and the base is formed with a large-diameter step 2a. The piston 2 is slidably fitted therein, and a cylinder cap 8 is hermetically screwed into the base of the cylinder chamber 3a.
An O-ring 9 for preventing leakage of pressure oil is fitted into a groove 2b formed on the peripheral surface of the step portion 2a of the piston 2. A groove 8a is also formed on the peripheral surface of the cylinder cap 8, and the pressure oil is formed. The O-ring 10 for preventing the leakage of the water is inserted. A stepped oil chamber 11 is formed on the base side of the piston 2, and a return spring 12 is fitted around the outer periphery of the piston 2. Further, an upper limit stopper 3b of the piston 2 is formed in a step portion of the cylinder chamber 3a to regulate the operation of the piston 2.

The tip of the piston 2 is a ball plunger 1
The movable die 4 is removably attached to the movable die 4 and the movable die 4. A mounting plate 14 for attaching a rack member 21 of a compression confirmation mechanism 20, which will be described later, is attached between the tip of the piston 2 and the movable die 4. I have. Hydraulic oil is discharged from the aerial work vehicle (not shown) from the discharge port 15 through the coupler 6 into the oil chamber 11 of the piston 2, and the piston 2 is moved to the fixed die 7 side by the hydraulic oil. The object to be compressed W is configured to be compressed. Further, the mounting plate 14 moves toward the fixed die 7 along with the compression operation of the piston 2, and rotates the spur gear 22 of the compression checking mechanism 20 meshing with the rack 21 a formed on the rack member 21.

As shown in FIG. 2, the compression confirmation mechanism 20
It is housed in the gear housing 30 and mounted on the side surface of the head unit 1. The compression confirmation mechanism 20 includes a rack member 21 attached to the piston 2 via the attachment plate 14,
A spur gear 22 meshing with the rack member 21, a ratchet gear 23 coaxially mounted on the spur gear 22, a ratchet member 24 formed in a substantially triangular shape and engaging with the ratchet gear 23, and a ratchet member 24 Joint 24b
And a switching lever 27 that engages with the elliptical hole 24c of the ratchet member 24, and further releases the engagement between the ratchet member 24 and the ratchet gear 23. A shaft 40 is also provided.

The rack member 21 attached to the piston 2 via the attachment plate 14 has a rack formed on the upper surface so as to mesh with the spur gear 22, and a pressing shaft 21 a having a protruding dimension adjustable at the tip thereof. The side surface of the switching lever 27 can be pressed. The rack member 21 and the lower end of the switching lever 27 are connected by a return spring 31 so that the rack member 21 can forcibly pull the lower end of the switching lever 27. The spur gear 22 meshing with the rack member 21 on the lower surface has teeth formed over the entire circumference. The ratchet gear 23 has a tooth cutout 23a on a part of the circumference (see FIG. 3A).
To facilitate positioning at the start.

A ratchet claw 24a of a ratchet member 24 is engaged with the upper end of the ratchet gear 23. This engagement relationship is such that the ratchet gear 23 can rotate in the forward direction (clockwise direction in the drawing) and cannot rotate in the reverse direction (counterclockwise direction). The ratchet member 24 is formed in a substantially triangular shape, has a center portion rotatably supported by a mounting pin 25, and has a ratchet claw 24 a formed at a vertex on a front end side engaging with the ratchet gear 23. An engaging portion 24b having two upper and lower engaging grooves 24b1 and 24b2 (see FIG. 3) is formed near the apex on the rear end side of the ratchet member 24. It is supposed to. The switching claw 26 is inserted into an insertion hole 30 formed in the gear housing 30.
a of the switching claw 26 is urged by a spring 28 so that the tip of the switching claw 26 always engages with any one of the grooves of the engaging portion 24b of the ratchet member 24.

A vertex on the lower end of the ratchet member 24 extends downward at a predetermined width, and an elliptical hole 24c for engaging with the switching lever 27 is formed in the extended portion. The switching lever 27 is formed in a substantially rectangular shape, and a central portion thereof is rotatably supported by a mounting pin 29 mounted on the gear housing 30. At the upper end of the switching lever 27, an engagement pin 27a is provided so as to protrude in the plate thickness direction, so that the engagement pin 27a fits loosely into the elliptical hole 24c of the ratchet member 24. Further, the switching lever 27
A return spring 3 connected to the rack member 21
One end is attached.

The compression confirmation operation of the compression confirmation mechanism 20 constructed as described above will be described with reference to FIGS. First, as shown in FIG. 3A, when the piston 2 starts, the ratchet pawl 24a of the ratchet member 24
Is at the position of the notch 23a of the ratchet gear 23, and if there is no problem in operation, the ratchet gear 23 rotates in the direction of the arrow as it is, and the ratchet gear 23 and the ratchet pawl 24
a is engaged, but if the position of alignment with the material to be compressed is poor and re-starting is necessary, the piston 2 is returned only while the ratchet claw 24a is at the position of the notch 23a of the ratchet gear 23. It is possible. At this time, the lower engaging groove 24b1 of the engaging portion 24b and the engaging claw 2
6 are engaged. When the rack member 21 moves in the direction of the fixed die 7 with the compression operation of the piston 2,
The spur gear 22 and the ratchet gear 23 rotate in the direction of the arrow. Then, the ratchet gear 23 is engaged with the ratchet pawl 24a, but the ratchet gear 23 is engaged with the ratchet pawl 24a.
And the ratchet gear 23 can rotate without resistance.

Next, as shown in FIG. 3B, when the compression work is performed by the piston 2 until the contact surface between the movable die 4 and the fixed die 7 is in close contact, the rack member 2 is pressed.
One pressing shaft 21a presses the side surface of the switching lever 27 by a predetermined dimension. Then, the switching lever 27 is forcibly rotated clockwise around the mounting pin 29, so that the engagement pin 2 protruding from the upper end of the switching lever 27 is provided.
7a also rotates, and presses the right side wall of the elliptical hole 24c of the ratchet member 24 with which the engaging pin 27a is engaged. When the elliptical hole 24c is pressed, the ratchet member 24 is forcibly rotated in the counterclockwise direction around the mounting pin 25, so that the ratchet pawl 24a rises up, and the ratchet claw 24a is not engaged with the ratchet gear 23. Become. On the other hand, since the engaging portion 24b of the ratchet member 24 is lowered downward, the switching claw 26 engages with the upper engaging groove 24b2 over the wall from the lower engaging groove 24b1 and maintains this state. I will be.

Next, as shown in FIG. 4 (a), when the compression operation is completed and the piston 2 retreats, the spur gear 2
The rotation direction of 2 is opposite to the direction of compression as shown by the arrow,
Since the ratchet gear 23 and the ratchet member 24 are not engaged, the coaxial spur gear 22 can freely rotate, and the piston 2 can return to the start position. When the piston 2 returns to the start position, the rack member 21 also returns to the start position at the same time. Therefore, the return spring 31 between the rack member 21 and the switching lever 27 has the maximum tension, and the switching lever 27 is rotated counterclockwise by this tension. Is rotated. Then, the ratchet member 24 is also forcibly rotated in the clockwise direction by pressing the left side wall of the elliptical hole 24c with the engagement pin 27a of the switching lever 27, so that the ratchet pawl 24a is also lowered and the ratchet gear 23 is The switching claw 26 is also moved from the upper engaging groove 24b2 to the lower engaging groove 24b.
It moves to b1 and enters the start state shown in FIG.

On the other hand, if the compression is not perfect for some reason, a gap α of 1 mm or less is generated between the movable die 4 and the fixed die 7 as shown in FIG. Then
The pressing shaft 21a of the rack member 21 is short by the gap α from the stroke of pressing the side surface of the switching lever 27, and the switching claw 26 is engaged with the engaging portion 2 of the ratchet member 24.
4b from the lower engaging groove 24b1 to the upper engaging groove 24b.
There is a shortage in the amount of movement required to get over the wall to 2 and the vehicle cannot get over the wall, and the switching claw 26 remains engaged in the lower engagement groove 24b1. As a result, the ratchet pawl 24a is engaged with the ratchet gear 23.

In order to retract the piston 2 in this state, the spur gear 22 needs to rotate in the reverse direction.
The spur gear 22 cannot rotate counterclockwise because the ratchet gear 23 coaxial with the gear engages the ratchet pawl 24a. Therefore, the piston 2 cannot be retracted and stops. Thus, the hydraulic compression tool A
In the above, once compression failure occurs, the compression confirmation mechanism 20 stops the piston 2 automatically, so that the work cannot proceed any further, and the defective product can be reliably detected. I have.

The hydraulic compression tool A constructed as described above
Automatically stops when poor compression occurs,
For example, when the connection work of the electric wires or the like is performed at a high place, the hydraulic compression tool A cannot be removed in a state where the electric wires are compressed, which causes a serious inconvenience. Therefore, a release shaft 40 for removing the hydraulic compression tool A from an electric wire or the like is provided for emergency evacuation. This release axis 4
5 is attached to a mounting hole formed in the gear housing 30 of the compression confirmation mechanism 20 as shown in FIGS. 5 and 6, and the structure thereof is, as shown in FIG.
, An intermediate portion 42, and a tip portion 43. The intermediate portion 42 includes a first engagement groove 42a and a second engagement groove 42b.
Are formed. When the release shaft 40 is not used, the first engagement groove 42a is positioned by the stopper piece 32. Further, the distal end portion 43 includes a small-diameter distal end 43a and a large-diameter truncated cone 43b. When the release shaft 40 is not used, as shown in FIG. Is in contact with the side surface 27d on the upper end side of.

However, as shown in FIG. 5B, poor compression occurs, and the ratchet gear 23 and the ratchet member 2
4 cannot be released, the release shaft 40 is forcibly pushed in as shown in FIG.
2 and the second engagement groove 42b are engaged. Then, FIG.
As shown in (b), the upper side surface 27d of the switching lever 27 comes into contact with the large-diameter truncated cone 43b, so that the upper side surface 27d of the switching lever 27 is pushed down, and the switching lever 27 is pressed by an arrow. By rotating in the direction, the ratchet member 24 also rotates in the direction of the arrow, and the engagement relationship between the ratchet gear 23 and the ratchet pawl 24a is released. When the release shaft 40 is used once, the release shaft 40 cannot be returned. In the case of a failure, the operation cannot be continued and the failure is prevented from continuing. .

The hydraulic compression tool A constructed as described above
Detects the compression failure by the compression confirmation mechanism 20,
Since the operation of the piston 2 is automatically stopped, poor compression can be reliably detected. Also, the level to be detected can be adjusted by the projecting dimension of the pressing shaft 21a, so that the control value can be determined with a dimension having a sufficient margin. In addition, even if the hydraulic compression tool A detects a compression failure and stops, the release shaft 40 allows the hydraulic compression tool A to be detached from an electric wire or the like in an emergency evacuation manner, so that a measure after the occurrence of the failure is convenient. become. In the above-described embodiment, the compression dimension is based on the contact surface between the movable die 4 and the fixed die 7. However, when the material to be compressed is large, the movable die 4 and the fixed die 7 do not contact each other. In this case, the surface of the upper limit stopper 3b of the piston 2 may be used as a reference.

[0024]

As described above, according to the present invention, a cylindrical cylinder portion and a jaw-shaped head portion are integrally formed, and a piston on which a movable die is fitted is slidably fitted in the cylinder portion. A fixed die is fixed to the head portion at a position opposed to the movable die, and a compression dimension of the compressed material is provided in a hydraulic compression tool for compressing the compressed material by the movable die and the fixed die. When the compression size is less than a predetermined compression size, a compression confirmation mechanism for stopping the reciprocating operation of the piston is attached to the head portion, so that the material of the material to be compressed is defective or work is poor, or Since the compression failure is detected when the compression size does not reach the regular compression size due to the breakage or deformation of the head portion, a serious accident or the like due to the compression failure can be prevented in advance.

[0025] The compression confirmation mechanism may include a rack member attached to the piston, a spur gear meshing with the rack member, a ratchet gear coaxially mounted on the spur gear, and a triangular shape. The center part is provided with a vertex formed with a ratchet pawl that engages with the ratchet gear, a vertex formed with an engaging groove that engages with the switching pawl, and a vertex formed with an elliptical hole that engages with the switching lever. A ratchet member rotatably supported, a switching claw that engages with an engagement groove of the ratchet member and fixes the ratchet member, and a ratchet member that engages with an oval hole of the ratchet member via an engagement pin. A switching lever for rotating the ratchet member, and a release shaft for releasing the engagement between the ratchet member and the ratchet gear. Since piston stops working, an effect that can be detected reliably compression failure.

Further, the release shaft has a truncated cone-shaped tip, an intermediate portion having a diameter larger than the tip, and a head having a diameter larger than the intermediate portion. By forming the two engagement grooves that engage with, the switching lever is forcibly rotated by pushing the tip of the truncated cone and the engagement relationship between the ratchet gear and the ratchet member can be released. The hydraulic compression tool can be detached from the electric wire of the object to be compressed, and the effect of improving the convenience in treating the hydraulic compression tool after the occurrence of compression failure is improved.

[Brief description of the drawings]

FIG. 1 is a front view showing a hydraulic compression tool according to the present invention.

FIG. 2 is an enlarged view of a main part of the hydraulic compression tool of FIG. 1 with a part broken.

FIG. 3 is an operation explanatory view of a compression confirmation mechanism of the hydraulic compression tool of FIG. 1;

FIG. 4 is an operation explanatory view of a compression confirmation mechanism of the hydraulic compression tool of FIG. 1;

FIG. 5 is an explanatory view showing a release shaft of the hydraulic compression tool of FIG. 1;

FIG. 6 is an explanatory view showing a releasing operation of a releasing shaft of the hydraulic compression tool of FIG. 1;

FIG. 7 is a partially broken front view showing a conventional hydraulic compression tool.

[Explanation of symbols]

 A Hydraulic compression device W Compressed material 1 Head 2 Piston 3 Cylinder 4 Movable die 5 Attachment 6 Coupler 7 Fixed die 8 Cylinder cap 9 O-ring 10 O-ring 11 Oil chamber 12 Return spring 13 Ball plunger 14 Mounting plate 15 Discharge port 16 Universal joint 17 Insulation cover 20 Compression check mechanism 21 Rack member 22 Spur gear 23 Ratchet gear 24 Ratchet member 25 Mounting pin 26 Switching claw 27 Switching lever 28 Spring 29 Mounting pin 30 Gear housing 31 Return spring 32 Stopper piece 40 Release shaft 41 head 42 middle part 43 tip

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Moriyasu Kakiuchi 1-9-24 Iwabuchi, Ise-shi, Mie Chubu Electric Power Co., Inc. Ise Office (72) Inventor Yasushi Miwa 3-1-32 Minato-ku, Nagoya-shi, Aichi Prefecture (72) Inventor Yoshiyoshi Maruyama 3039 Sasaga, Matsumoto City, Nagano Prefecture Inside Izumi Seiki Seisakusho Co., Ltd.

Claims (3)

[Claims] A cylindrical cylinder portion and a jaw-shaped head portion are integrally formed, a piston having a movable die fitted therein is slidably inserted into the cylinder portion, and the head portion includes the piston. A fixed die is fixed at a position facing the movable die,
In a hydraulic compression tool that compresses a material to be compressed by the movable die and the fixed die, a compression size of the material to be compressed is detected, and when the compression size is less than a predetermined compression size, the backward movement of the piston is performed. A hydraulic compression tool, wherein a compression confirmation mechanism for stopping is mounted on the head portion. 2. The compression checking mechanism includes a rack member attached to the piston via an attachment plate, a spur gear meshing with the rack member, a ratchet gear mounted coaxially with the spur gear, and It has a vertex formed in a triangular shape and formed with a ratchet pawl that engages with the ratchet gear, a vertex formed with an engaging groove that engages the switching pawl, and a vertex formed with an elliptical hole that engages the switching lever. A ratchet member whose center is rotatably supported, a switching claw that engages with an engagement groove of the ratchet member to fix the ratchet member, and an engagement pin in an oval hole of the ratchet member. 2. A switching lever for engaging and rotating a ratchet member, and a release shaft for releasing the engagement between the ratchet member and the ratchet gear.
2. A hydraulic compression tool according to claim 1. 3. The release shaft includes a frusto-conical tip, an intermediate portion having a diameter larger than the tip, and a head having a diameter larger than the intermediate portion. 3. The hydraulic compression tool according to claim 2, wherein two engagement grooves are formed to engage with the hydraulic compression tool.