JPH0214934Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a hose connection fitting used for fixing a connection fitting such as a sleeve, which is used when connecting a hose and a metal fitting, to the end of a crimped hose. This relates to a tightening device.

[Prior Art] A conventional tightening device for a hose connection fitting has a configuration as shown in FIG. That is, a cylinder a which is hollow and has a piston part b at its upper part is fixed in order to allow the hose to pass through, and an outer cylinder which is normally subjected to an upward action by a spring c on the outside of the cylinder a. d are slidably fitted, O-rings e and f are provided as sealing devices between the outer cylinder d and the fixed cylinder a, and a flow path g is formed between the O-rings e and f. By applying pressure fluid to the outer cylinder d, the outer cylinder d can be lowered along the fixed cylinder a against the elasticity of the spring c. Further, the outer cylindrical body d, which is moved vertically, has an inner surface with a tapered surface i that widens downward, and a plurality of dies j are engaged with the tapered surface i so as to be able to move only in the vertical direction. When the die holding ring h configured in this way is screwed together or fixed and the die holding ring h is lowered together with the outer cylinder d, the plurality of dies j engaged with the tapered surface i of the die holding ring h are At the same time, the upper end surface of the fixed cylindrical body a is used as a guide to move in opposite directions to reduce the diameter.

In the conventional tightening device having the above configuration,
When tightening the connecting fitting l fitted to the end of the hose k, place the connecting fitting l inside the plurality of dies j as shown in the figure, and then lower the die retaining ring h to tighten each of the fittings. By pushing the dies j inward and pressing the dies j against the surface of the connection fittings l and tightening them, each die j bites into the connection fittings l and is crimped. On the other hand, after tightening the connecting fitting l, when the pressure fluid that has been press-fitted into the flow path g is discharged, the outer cylinder d is raised by the elasticity of the spring c, so the die holder rises together with the outer cylinder d. Each die j is moved outward by the ring h and retracted to a position away from the fitting l.

In recent years, conventional hose connection fitting tightening devices with such structural functions have been used not only for straight hoses but also for tightening connections when attaching fittings to both ends of bent pipes bent at nearly 90 degrees. In this case, it is necessary to prevent the other end of the bend pipe from interfering with the tightening device when tightening one end of the bend pipe. For tightening devices for hose connection fittings, () the diameter of the part where the connection fitting is tightened to the hose should be as large as possible, and () it is mechanically advantageous to shorten the length of the bent pipe material. , To make the axial thickness of the device as thin as possible in order to be able to caulk the connection fittings to short pipe materials, There are contradictory demands being made to shorten the time it takes to complete a transaction as much as possible.

[Problems to be solved by the invention] However, when considering the above-mentioned conventional hose connection fitting tightening device based on the requirements () to () above, it is found that in the conventional device, each die j
The die holding ring h that expands and contracts the die has only one sliding surface with the die j,
Since the amount of expansion and contraction of the die j is determined in proportion to the movement stroke of the die holding ring h, in order to increase the diameter to satisfy the above requirement (), the tapered surface i of the die holding ring h must be However, if the length of the tapered surface i is increased, the axial length of the die holding ring h becomes longer, and the axial thickness of the device becomes thicker. Therefore, the above requirement () cannot be met. If the requirements in parentheses () cannot be met, it will not be possible to tighten and fix the connecting fittings to the short parts of the bend pipe material, and the short pipe materials will inevitably be excluded from the scope of handling.
It can only handle bent pipes, which are mechanically disadvantageous. In addition, in order to satisfy the above requirement (), it is necessary to increase the operating speed of the die holding ring h during tightening to shorten the time it takes for the die j to hit the connection fitting l; If the diameter is increased and the axial length of the die holding ring h is increased in order to satisfy the above requirements, the movement stroke of the die holding ring h will be correspondingly larger. There is no choice but to increase speed, and large pumps with large discharge capacity are becoming essential.

In this way, in the conventional device, the above ()
It was not possible to satisfy all the requirements of () and ().

Therefore, the present invention is designed to increase the amount of expansion and contraction of the die with a small movement stroke of the die holding ring, and to reduce the moving speed of the die holding ring even when the diameter of the hose insertion part is increased, resulting in a small size with a small discharge capacity. It is an object of the present invention to provide a tightening device for a hose connection fitting that can perform tightening work in a short time using a pump and can reduce the thickness in the axial direction as much as possible.

[Means for Solving the Problems] In order to achieve the above object, the present invention has at least one set of obtuse angle chevron-shaped slide surfaces bent in two steps in an upwardly widening direction on the upper part of the inner surface. The die holding ring is fitted into the inner surface of the fixed cylinder so that it can slide vertically, and the die holding ring is raised against the elastic body between the outer surface of the die holding ring and the inner surface of the fixed cylinder. A plurality of dies are provided inside the die holding ring and have a notch-shaped sliding surface on the outside corresponding to the chevron-shaped sliding surface of the die holding ring. In addition, the fixed cylindrical body is assembled so as to be horizontally movable in the inward and outward directions using the ceiling surface as a guide, and the adjacent dies are connected with an elastic body so that each die always acts outward.

[Function] The chevron-shaped sliding surface of the die holding ring and the notch-shaped sliding surface on the outside of each die are in a state of engagement, and when the die holding ring is pushed up in this state, the chevron-shaped sliding surface of the above-mentioned chevron-shaped sliding surface Since the near-horizontal sliding surface is first raised in contact with the sliding surface of the die, each die is horizontally moved largely and rapidly inward with little movement of the die retaining ring, and its diameter is reduced. When the die holding ring is further pushed up, the near-vertical sliding surface of the die holding ring is raised in contact with the near-vertical sliding surface of each die, so each die is reduced in diameter at a low speed and the force is increased. Connecting fittings can be tightened with a large tightening force.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

Figures 1 to 4 show an embodiment of the present invention, in which the end of a hose 3 is fitted onto the upper end surface of a cylinder 1 whose lower end is slightly reduced in diameter to form a stepped part 2. A flat plate 5 having an inner diameter larger than the outer diameter of the connecting fitting 4 is fixed with bolts or the like so as to be removable so that the connecting fitting 4 such as a sleeve can be penetrated therethrough. It can be installed on a floor or the like using a pedestal 6 or a cylindrical body, and inside the fixed cylindrical body 1 is a die holding ring 7 that engages and supports a plurality of dies 8 on its inner surface and is movable in the vertical direction. The die holding ring 7 is moved up and down so that each die 8 can be moved stepwise inward or outward in the radial direction along the lower surface of the flat plate 5 constituting the ceiling of the cylinder 1.

To explain in detail, the die holding ring 7 has a fourth die holding ring 7.
As shown in the figure, tapered surfaces 7a, 7b, 7c, and 7d are provided on the inner circumferential surface by bending so that the diameter gradually decreases and tapers from above to below. The angles θ ₁ with respect to the horizontal line are the same, and the tapered surfaces 7b and 7d have the same angles θ ₂ with respect to the vertical line, and the tapered surfaces 7a and 7b
A chevron-shaped slide surface _S1 and a tapered surface 7c,
It has a structure in which two sets of chevron-shaped sliding surfaces S ₂ of 7d are provided, and a ring-shaped recess 9 is formed on the outer peripheral surface, and the recess 9 is formed in a stepped portion 2 provided on a fixed cylinder 1. The spring 11 is interposed between the lower end protrusion 10 of the die retaining ring 7 and the lower end of the cylinder 1 so that the die retaining ring 7 itself is received by the stepped portion 2 by its own weight. This ensures that the die holding ring 7 is always receiving downward force. The plurality of dice 8 held by the die holding ring 7 have inclined surfaces 8a and 8b corresponding to the tapered surfaces 7a and 7c of the die holding ring 7, and inclined surfaces 8a and 8b corresponding to the tapered surfaces 7b and 7d of the die holding ring 7. Surfaces 8b and 8d are alternately formed on the outer surface so that the cross-sectional shape becomes gradually thinner from the top to the bottom, and the tapered surfaces 7a and 7c of the die holding ring 7 form the sloped surface of each die 8. 8a, 8
In addition, the tapered surfaces 7b and 7d of the die holding ring 7 are made to be able to slide in contact with the inclined surfaces 8b and 8d of each die 8, and the dice 8 arranged in the circumferential direction are , are connected by a spring 12 extending in the horizontal direction, and each die 8 is connected by the elasticity of the spring 12.
is configured so that it always expands outward in the radial direction.

Additionally, O-rings 13 and 14 are provided as sealing devices between the stepped portion 2 of the fixed cylinder 1 and the outer surface of the die holding ring 7, and a flow path 15 is provided between the O-rings 13 and 14. When a pressure oil pipe 16 is connected to the flow path 15 and hydraulic pressure is applied to the flow path 15, the die holding ring 7 moves along the inner surface of the fixed cylinder 1 against the spring 11. Allow it to rise at a constant speed.

When tightening the connecting fitting 4 fitted to the end of the hose, insert it downward from above between the plurality of dies 8 as shown in Fig. 1, so that the tightening position of the connecting fitting 4 is at the same level as the dies 8. Set it so that it will come. In the state shown in FIG. 1, the die holding ring 7 is located at the lower limit and the die 8 is opened to its maximum diameter, and there is a gap between each die 8 and the connecting fitting 4. In this state, the near-horizontal tapered surface 7a at the top of the die holding ring 7 is in contact with the near-horizontal inclined surface 8a on the upper side of each die 8.

In the above state, when pressure oil is supplied through the pressure oil pipe 16 to the flow path 15 between the die holding ring 7 and the cylinder 1, the die holding ring 7 is pushed up while compressing the spring 11. Since the upper end surface of each die 8 is brought into contact with the flat plate 5 constituting the ceiling of the cylindrical body 1, the rise of the die retaining ring 7 causes the tapered surface of the die retaining ring 7 and the inclined surface of the die 8 to The slide causes each die 8 to be rapidly moved radially inward. At this time, the slide surfaces of the die holding ring 7 and each die 8 are both near-horizontal inclined surfaces 7a and 8a.
Therefore, each die 8 can be moved quickly and greatly with a small movement stroke of the die holding ring 7, and even if the diameter of the part where the hose 3 and the connecting fitting 4 are inserted is increased, each die 8 can be moved quickly and greatly by a small movement stroke of the die holding ring 7. It is possible to reduce the idle running time until the machine is hit, which reduces the work time accordingly, and
The thickness of the device can be reduced by the shorter movement stroke of the die holding ring 7.

The die holding ring 7 continues to be raised, and when the tapered surface 7a of the die holding ring 7 comes off the sloped surface 8a of each die 8, the near vertical tapered surface 7 of the upper part of the die holding ring 7
b and the lower nearly vertical tapered surface 7d are in contact with the nearly vertical inclined surfaces 8b and 8d of each die 8, and the surfaces 7b and 8b, 7d and 8d serve as sliding surfaces, and each die 8 is moved radially inward. pushed to.
In this case, since the sliding surface consists of the nearly vertically inclined surfaces 7b and 8b, 7d and 8d as described above, the amount of movement of each die 8 is smaller than the movement stroke of the die holding ring 7. , each die 8 is reduced in diameter at low speed and increased in force to tighten the connecting fitting 4 with a large tightening force, and each die 8 is pushed evenly up and down, so the die 8 is balanced and moves easily. can.

When the die holding ring 7 continues to rise and reaches the upper limit position where the near-horizontal tapered surface 7c at the bottom of the die holding ring 7 comes into contact with the near-horizontal inclined surface 8a at the top of each die 8 as shown in FIG. , channel 1
The supply of pressure oil to 5 is automatically stopped and this state is maintained. Confirmation that the die holding ring 7 has reached the stroke end is performed by detecting the hydraulic pressure in the pressure oil pipe 16. When a predetermined pressure is reached, the valve automatically closes and locks in the state shown in Figure 2. You can do it like this.

When the connecting fitting 4 is tightened and fixed to the end of the hose 3 by reducing the diameter of each die 8, the pressure oil piping 16
The valve in the middle is switched to connect the pressure oil in the flow path 15 to the discharge side of a tank or the like. As a result, the die holding ring 7 is lowered by the restoring force of the spring 11 compressed during the above-mentioned tightening operation, and each die 8, which is constantly receiving a force that tends to expand outward, is held by the die holding ring 7. The ring 7 moves horizontally outward in the radial direction while sliding on each tapered surface on the inner surface, and as shown in FIG. back up to.

Note that the present invention is not limited to the above-mentioned embodiments. For example, the inner surface of the die holding ring 7 includes a chevron-shaped slide surface S1 consisting of tapered surfaces 7a and 7b, and a chevron-shaped sliding surface _S1 consisting of tapered surfaces 7c and 7d. When the die retaining ring ₇ is raised and moved to final tightening, the two slide surfaces _S1 and _S2 push each die 8 radially inward at low speed. However, even if only the slide surface _S1 is used, each die 8 is rapidly reduced in diameter at the start of tightening, and the diameter of each die 8 is tightened at a low speed and with a large force near the end of tightening, as in the previous embodiment. The diameter can be reduced by force, and the number of sliding surfaces on the die holding ring 7 is not limited to two as shown in the embodiment, but may be three or more. Figures 1 and 2
If the chevron-shaped sliding surface formed on the inner surface of the die holding ring 7 is three or more steps for the dice 8 shown in the figure, the amount of expansion and contraction of each die 8 can be increased, and the diameter of the connecting fitting 4 can be increased. It has the advantage that it is possible to tighten from a large to a small one, and a larger final tightening force can be obtained. In addition, although the case where the die holding ring 7 is made of pressurized oil supplied into the flow path 15 is shown,
Fluid pressure other than pressure oil may be used, and although the die holding ring 7 is always pushed downward by the spring 11 in the example shown, it is possible to use fluid pressure instead of the spring 11. A downward force may be generated. By doing so, there is an advantage that the thickness of the entire device can be reduced by the amount of the spring 11. Furthermore, a pointer is fixed to the die holding ring 7 and projected upward, and a scale plate is erected on the flat plate 5 on the side of the cylinder 1.
Of course, the tightening force of each die 8 on the connecting fitting 4 may be made visible from the outside, and various other changes may be made without departing from the gist of the present invention.

[Effects of the invention] As described above, according to the hose connection fitting tightening device of the present invention, the inner surface of the die retaining ring that is slidable in the vertical direction inside the fixed cylinder body is provided with a downward step. A chevron-shaped sliding surface is provided by forming a near-horizontal tapered surface and a near-vertical tapered surface so that the diameter is small, and a plurality of dice are slidably held on the die holding ring, and each of the above-mentioned The upper end of the die is in contact with the ceiling of the fixed cylindrical body so that it can slide, and the die has a near-horizontal and near-vertical slope on the outside, so it has the following excellent effects. can be played.

(i) When moving the die holding ring in the axial direction, when the near-horizontal tapered surface of the die holding ring contacts the near-horizontal inclined surface of the die and the die is slid, a short stroke of the die holding ring is required. Since each die can be moved quickly and the expansion/contraction amount of each die can be increased, even if the diameter of the insertion part of the hose and connection fitting is increased, the working time can be significantly shortened, and the axial thickness of the device can be reduced. Can be said ()
() All the requirements of () can be satisfied. Furthermore, when the die holding ring's near-vertical tapered surface and the die's near-vertical inclined surface contact each other and are slid, each die can be expanded or contracted at a low speed by constant movement of the die holding ring. can generate a large tightening force and can be tightened reliably.

(ii) Since the expansion and contraction of each die can be increased with a short stroke of the die holding ring, the thickness of the entire device can be reduced by the short stroke of the die holding ring, and the device can be made smaller. This makes it possible to reliably tighten the connecting fittings on both ends of the bent pipe, even if the bent pipe has short pipe dimensions, making it possible to create a bent pipe with short connecting fittings that is mechanically ideal. can get.

(iii) Since the expansion and contraction of each die is performed by sliding the curved inclined surface of each die and the tapered surface of the die holding ring with a different angle of inclination, the expansion and contraction of each die is controlled by fluid pressure control. Cost reduction can be achieved compared to the conventional method.

(iv) Since the plurality of dies are connected to each other by an elastic body and are constantly receiving a force that expands outward, each die and the die holding ring can be engaged without a guide, and the die retaining ring can be engaged without a guide. You can zoom in and out.

[Brief explanation of the drawing]

Figure 1 shows an embodiment of the tightening device of the present invention, and is a sectional view showing the state before tightening, and Figure 2 is a cross-sectional view of the tightening device of the present invention.
A sectional view showing the state after tightening from the state shown in the figure,
FIG. 3 is a plan view of FIG. 1, FIG. 4 is a sectional view of the die holding ring, and FIG. 5 is a sectional view showing an example of the conventional method. 1...Cylinder body, 3...Hose, 4...Connection fittings,
5...Flat plate, 7...Dice holding ring, 7a, 7
b, 7c, 7d...Tapered surface, 8...Dice,
8a, 8b, 8c, 8d...slanted surface, 11, 12
... Spring, 13, 14 ... O-ring, 15
...Flow path, S ₁ , S ₂ ...Slide surface.

Claims (1)

[Scope of utility model registration request] A die holding ring having at least one set of obtuse chevron-shaped sliding surfaces bent in two steps in an upwardly widening direction on the upper part of the inner surface is fitted onto the inner surface of the fixed cylindrical body so as to be slidable in the vertical direction. A flow path is provided between the outer surface of the die retaining ring and the inner surface of the fixed cylinder to apply fluid pressure to raise the die retaining ring, and the channel corresponds to the chevron-shaped sliding surface of the die retaining ring. A plurality of dies having sliding surfaces cut out on the outside are installed inside the die holding ring so as to be horizontally movable in the inward and outward directions using the ceiling surface of the fixed cylinder as a guide, and each adjacent die is A tightening device for a hose connection fitting, characterized in that each die is connected by an elastic body that pushes the dies outward.