JPH0735069B2 - Flow path connection device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge flow path for discharging a fluid and an injection flow path for receiving a fluid, for example, when connecting a discharge flow path of an injection mechanism of an injection molding machine and a mold injection flow path. The present invention relates to an applied flow path connecting device.

[0002]

2. Description of the Related Art When a molten fluid of synthetic resin discharged from an injection mechanism of an injection molding machine is fed into a mold, conventionally, as shown in FIG. 7, an injection mechanism s of the injection molding machine is advanced to move its tip. The discharge part t1 of (1) is brought into abutting contact with the injection part t2 of the mold k to connect the discharge flow path r1 in the discharge part t1 and the injection flow path r2 in the injection part t2.

[0003]

When the flow paths r1 and r2 are connected by the above method, the molten fluid is contacted with the discharge surface t1 and the injection portion t2 at the time of connection and disconnection.
Since it easily leaks from the gap, the leaked molten fluid is trapped between the contact surfaces m and adheres to the contact surfaces m, and then the discharge part t
1 has a problem that the connection state between the injection portion 1 and the injection portion t2 is poor, resulting in defective molding, and a problem that the work of removing the cold slag fixed to the contact surface m is complicated. SUMMARY OF THE INVENTION It is an object of the present invention to eliminate a trouble caused by fluid leakage when connecting and disconnecting a flow path.

[0004]

A flow channel connecting device of the present invention is connected to a first joint nozzle having a first internal flow channel connected to a discharge flow channel for discharging a fluid, and an injection flow channel for receiving a fluid. And a second joint nozzle having a second internal flow path, which can be combined and separated, are arranged in a concentric manner,
Wherein the first joint nozzle has a contact surface for opening and closing the outlet of the first internal flow path, the fluid of the first internal flow path
A first valve rod that moves forward and backward in the axial direction under pressure and a first spring that presses the first valve rod in the return direction are installed, and the second valve rod is installed .
The inside joint nozzle has a contact surface for opening and closing the inlet of the second internal flow passage, said both joints nozzle coalesce
When the first valve rod moves back and forth, the rear end surface is the first valve rod.
Axially with the first valve rod in close contact with the front end face of the
A second valve rod that moves back and forth to and a second valve rod that has a pressing force that is equal to or greater than the pressing force of the first spring and that pushes the second valve rod in the return direction.
A spring is installed, and the front end face of the first joint nozzle is
In the vicinity of the central portion, when the first valve rod retracts, the first
Forming a rear seal surface aligned with the front end surface of the valve stem,
The second joint is provided near the center of the rear end face of the two joint nozzle.
When the valve stem retracts, it is aligned with the rear end face of the second valve stem.
On the rear seal surface when the two joint nozzles are combined.
Forming an intimate front seal surface, the outlet of the first internal flow path
The state where the first valve rod is retracted to the retracted end on the wall surface around
To form a first valve seat with which the contact surface of the first valve rod is in close contact,
The second valve rod recedes on the wall surface around the inlet of the second internal flow path.
The contact surface of the second valve rod comes into close contact with the moving end when retracted.
It has the structure which formed the 2nd valve seat .

[0005]

In the flow path connecting device having the above structure,
When disconnecting both joint nozzles, use the first spring
The contact surface of the first valve rod pressed in the returning direction is the first valve seat.
And the outlet of the first internal flow path is pushed by the first valve rod.
And the front end face of the first valve stem is aligned with the rear seal face.
The first valve stem is held in the retracted end to the second end,
The second valve rod pressed in the return direction by
Is pressed against the second valve seat and the inlet of the second internal flow path is the second
Sealed by the valve stem, the rear end face of the second valve stem is the front seal face.
Is held in the state where the second valve rod is retracted to the retracted end by being aligned with
Be done. When both joint nozzles are united, the rear seal surface
The front end face of the first valve stem is in close contact with the front seal face and
Close to the rear end face. In this state, the fluid pressure in the first internal flow path
Is a combination of the pressing force of the first spring and the pressing force of the second spring.
When the pressure rises above the pressure, the front end face of the first valve stem and the second valve stem
The 1st valve stem and the 2nd valve stem with the rear end face being in close contact
Both retract, the outlet of the first internal flow path and the second internal flow path
Is opened and both internal flow paths are opened,
The fluid discharged from the inside passes through both internal flow paths to the injection flow path.
When the fluid is pumped and the fluid pressure in the first internal flow channel drops,
The joint nozzle is restored to the state immediately after uniting.

[0006]

According to the present invention, both joint nozzles
The front and rear seal surfaces and both valve rods were in close contact when united
State and both valve rods remain in close contact when the fluid is pumped.
Since both valve rods move forward and backward jointly in the state, it is possible to accurately prevent the fluid from being confined and invaded between the joint nozzles and between the valve rods from the start of the pressure feeding of the fluid to the end of the pressure feeding. Also, when disconnecting both joint nozzles, use the contact surface of the first valve rod that is pressed against the first valve seat.
The outlet of the first internal channel is sealed and pressed against the second seat.
Due to the contact surface of the second valve rod, the inlet of the second internal flow path is
Since the sealed, both during disconnection of both the joint nozzle
Fluid leakage from the connection part of the internal flow path can be accurately prevented. Therefore, it is possible to eliminate the occurrence of cold slag due to fluid leakage and fluid confinement, and it is possible to eliminate molding defects and connection defects due to cold slag.
It is possible to eliminate the work of removing the leaked fluid and the work of cleaning the internal flow path .

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, one embodiment of the present invention applied to an injection molding machine will be described with reference to FIGS. The flow path connecting device discharges the plasticized fluid by melting the synthetic resin material from the discharge part T1 at the tip of the injection device S of the injection molding machine and injects it into the mold K through the injection part T2. When a molded product is injection-molded, a discharge flow path R1 of a discharge section T1 that discharges a fluid and an injection flow path R of an injection section T2 that receives a fluid.
It is installed between the discharge part T1 and the injection part T2 in order to connect the two.

The flow path connecting device is provided with a first joint nozzle 1 and a second joint nozzle 2 which are concentrically arranged in series and arranged side by side so as to be able to be combined and separated, and the first joint nozzle 1 projects to a discharge portion T1. The second joint nozzle 2 is coupled and connected in a mating shape, and the second joint nozzle 2 is coupled and connected in a butt shape to the injection portion T2.

When the injection device S retracts, the first joint nozzle 1 is separated from the second joint nozzle 2 and retracts together with the discharge portion T1, and when the injection device S advances, both joint nozzles 1 and 2 are united.

The first joint nozzle 1 has an outer cylinder 3 having a through hole formed longitudinally in the central portion thereof, and an inner cylinder 3 which is installed in the outer cylinder 3 at substantially equal intervals over the entire length so as not to rotate and move back and forth. And a cylinder 4. The outer cylinder 3 and the inner cylinder 4 are each formed by joining two members.

At the center of the first joint nozzle 1, there is an inlet 6 formed at the center of the rear end of the outer cylinder 3, the gap between the outer cylinder 3 and the inner cylinder 4, and the center of the front end of the outer cylinder 3. The first internal flow path 5 communicating with the outlet 7 formed in
The fluid discharged from the discharge portion T1 flows through the first internal flow path 5 and is fed into the second joint nozzle 2.

A connecting portion 3a which is screwed into the discharge portion T1 is formed at the rear end portion of the outer cylinder 3, and a flange portion 3b having a tapered surface on the rear side is annularly formed on the outer peripheral surface of the front end portion of the outer cylinder 3. And a rear sealing surface 3c having a convex curved surface slightly projecting forward is formed at the center of the front end surface of the outer cylinder 3, and a positioning groove 3d is annularly formed in the front end surface of the outer cylinder 3. Has been done.

A wall around the outlet 7 at the center of the front end of the outer cylinder 3.
A first valve seat 8 having a conical surface shape whose diameter gradually increases toward the front is formed on the surface, and a rear inner wall surface 3e whose diameter gradually increases toward the front is formed on the inner peripheral surface of the outer cylinder 3. The inner inner wall surface 3f having a diameter of 3 and the front inner wall surface 3g having a diameter that gradually decreases toward the front are sequentially formed from the rear.

A round hole-shaped spring hole 4a is formed near the center of the inner cylinder 4, and a front slide hole provided in the center of the inner cylinder 4 in front of the center of the spring hole 4a. 4b
And a rear slide hole 4c disposed behind the center of the spring hole 4a. On the outer peripheral surface of the inner cylinder 4, a rear peripheral body surface 4e parallel to the rear inner wall surface 3e of the outer cylinder 3, a middle peripheral body surface 4f parallel to the inner inner wall surface 3f, and a front peripheral body parallel to the front inner wall surface 3g. The surface 4g and the surface 4g are sequentially formed from the rear.

In the front and rear slide holes 4b and 4c of the inner cylinder 4, a first valve rod 9 inserted in the central portion of the first joint nozzle 1 is inserted so as to be movable forward and backward. .

At the front portion of the first valve rod 9, a sliding portion 9a slidably fitted in the front slide hole 4b of the inner cylinder 4 and an outer diameter connected to the front end of the sliding portion 9a and having an outer diameter. A small diameter portion 9b that is slightly smaller than the outer diameter d1 of the sliding portion 9a is formed, and the front end of the first valve rod 9 is connected to the front end of the small diameter portion 9b and the diameter gradually increases toward the front. It has a planar outer peripheral surface shape, and when the first valve rod 9 advances, the first internal flow path 5
A pressure receiving portion 9c for receiving the fluid pressure therein is formed. However, the step between the sliding portion 9a and the small diameter portion 9b may be eliminated.

On the outer peripheral surface of the pressure receiving portion 9c of the first valve rod 9, a pressure receiving surface 10 having a conical surface shape whose diameter gradually increases toward the front is formed, and in front of this pressure receiving surface 10, the first valve rod 9 is formed. Retreat to the end
When it moves, it closely contacts the first valve seat 8 and seals the outlet 7,
When the 1st valve rod 9 moves forward, it is separated from the 1st valve seat 8 and the outlet 7
Contact surface 11 to be opened is formed a slope of the contact surface 11, confinement contact surface 11 of the fluid to between the contact surface 11 when in close contact with the first valve seat 8 and the first valve seat 8 For the purpose of preventing this, a gentle angle is set by the gradient of the rear portion of the pressure receiving surface 10. The first valve rod 9 retracts from the front end surface of the first valve rod 9.
To be aligned with the rear seal surface 3c when retracted to the end
Has been formed.

The diameter d2 of the rear edge of the contact surface 11 is equal to the diameter of the rear edge of the first valve seat 8, and the diameter d3 of the front edge of the contact surface 11 is the diameter of the front edge of the first valve seat 8. And is set to the same length.

A spring bearing plate 22 which is slidably fitted in the spring hole 4a and is prevented from loosening by a lock nut 21 is fitted near the rear end of the first valve rod 9, and the first valve rod 9 is an inner cylinder. 4 is pushed into the return portion T1 side in the returning direction by the first spring 20 that is inserted into the spring hole 4a of the No. 4 and is elastically contacted with the spring receiving plate 22, and the contact surface 11 of the first valve rod 9 is the first spring. It is pressed against the first valve seat 8 by the pressing force of 20.

The second joint nozzle 2 has an outer cylinder 14 having a shape that is substantially the same as the outer cylinder 3 of the first joint nozzle 1 reversed in the opposite direction, and a gap that is substantially equal over the entire length in the outer cylinder 14. An inner cylinder 15 that is installed so as not to rotate and move back and forth and has a shape that is substantially the same as the shape in which the inner cylinder 4 of the first joint nozzle 1 is reversed in the opposite direction is provided. The outer cylinder 14 and the inner cylinder 15 are each formed by joining two members.

At the center of the second joint nozzle 2, an inlet 17 opened at the center of the rear end of the outer cylinder 14 and an outer cylinder 14 are provided.
A second internal flow passage 16 is formed in a vertically extending shape, in which a gap between the inner pipe 15 and the inner pipe 15 and an outlet 18 opened at the center of the front end of the outer pipe 14 communicate with each other, and is sent out from the first internal flow passage 5. The fluid flows through the second internal flow path 16 and is sent into the injection flow path R2.

A screw portion 14a formed on the front end of the outer cylinder 14
A flange 38 that is fastened to the injection portion T2 of the mold K is screwed into this, and a flange portion 14b having a tapered surface on the front side surface is annularly projected on the outer peripheral surface of the rear end of the outer cylinder 14. 14
In the central portion of the rear end face, a concave curved front seal face 14c into which the rear seal face 3c of the first joint nozzle 1 is tightly fitted when the joint nozzles 1 and 2 are united is provided as a recess. A positioning rib 14d, which is fitted into the positioning groove 3d of the first joint nozzle 1 when the joint nozzles 1 and 2 are united, is annularly formed on the rear end surface of the ring 14.

The wall surface around the inlet 17 of the outer cylinder 14 has a first
The maximum diameter of the valve seat 8, that is, the diameter d of the front edge of the contact surface 11.
A second conical surface-shaped valve seat 19 having a minimum diameter equal to 3 and gradually increasing in diameter toward the front is formed. However, you may form the 2nd valve seat 19 so that a diameter may become equal over the full length.

A round hole-shaped spring hole 15a is formed near the center of the inside of the inner cylinder 15, and a rear slide hole 15b communicating with the spring hole 15a is formed at the center of the rear part of the inner cylinder 15. A front slide hole 15c whose diameter is smaller than that of the rear slide hole 15b is formed in front of the center of the spring hole 15a.

The front and rear slide holes 15c and 15b of the inner cylinder 15
It has a rear large-diameter portion 23a and a small-diameter portion 23b extending forward of the large-diameter portion 23a, and concentrically projects from the first valve rod 9 when the joint nozzles 1 and 2 are combined. The second valve rod 23, which is in contact with the mating shape, is inserted so as to be movable forward and backward.

On the outer peripheral surface near the rear end of the second valve rod 23, a second
It has the same shape as the valve seat 19, and the second valve rod 23 moves to the retracted end.
Closes the inlet 17 closely to the second valve seat 19 when retracted
However, when the second valve rod 23 is advanced, it is separated from the second valve seat 19.
To open the inlet 17 to form a contact surface 24 for receiving the fluid pressure in the second internal flow path 16, and the contact surface 24 has a minimum diameter equal to the maximum diameter d3 of the contact surface 11 of the first valve rod 9. And has a conical surface having a maximum diameter d4 equal to the maximum diameter of the second valve seat 19. However, the contact surface 24 may be formed to have the same diameter over the entire length.
At the rear end surface of the second valve rod 23, the second valve rod 23 retracts to the retracted end.
Is formed so as to be aligned with the front seal surface 14c when
ing.

The diameters d1, d2, d3 and d4 of the contact surfaces 11 and 24 of both valve rods 9 and 23 are d1 <d2 <in this example.
It is set so that d3 <d4.

At the rear end of the small diameter portion 23b of the second valve rod 23, a spring receiving plate 26 slidably fitted in the spring hole 15a.
And the second valve rod 23 is inserted into the spring hole 15a and pressed by the second spring 27 elastically contacted with the spring receiving plate 26 toward the first joint nozzle 1 in the returning direction.
The contact surface 24 of the valve rod 23 is pressed against the second valve seat 19 by the pressing force of the second spring 27.

The pressing force with which the second spring 27 pushes back the second valve rod 23 is set to be equal to or greater than the pressing force with which the first spring 20 pushes back the first valve rod 9, and the first spring 20 is at the retracted end position of the first valve. When the pressing force for pushing back the rod 9 is P1, and the pressing force for pushing the second valve rod 23 at the retracted end position is P2, P2 is P.
It is set such that 1 <P2.

Further, the front end face of the second valve rod 23 arranged at a preset distance and the end face of the front slide hole 15c are brought into contact with each other, so that the first valve rod 9 is advanced by a predetermined distance and the first valve rod 9 is moved.
When the spring 20 is compressed, the pressing force with which the first spring 20 pushes back the first valve rod 9 is P3, and the second valve rod 23 has the first valve rod 9
P4> P3, where P4 is the pressing force for the second spring 27 to push back the second valve rod 23 when the second spring 27 is compressed by an equal distance.

The contact surface 11 of the first valve rod 9 is pressed against the first valve seat 8 and the contact surface 24 of the second valve rod 23 is pressed against the second valve seat 19.
When the joint nozzles 1 and 2 are united in a state of being pressed against, the valve rods 9 and 23 are butted against each other while the internal flow passages 5 and 16 are blocked, and the front end face of the first valve rod 9 is contacted. And the rear end surface of the second valve rod 23 come into close contact with each other. When both valve rods 9 and 23 move together in this state, both internal flow paths 5 and 16 are opened.

Both inner flow paths 5 and 16 are provided in both outer cylinders 3.14.
A pair of front and rear band heaters 3 for heating the fluid inside
9 are wound respectively.

In the clamping mechanism for locking and unlocking the joint nozzles 1 and 2 in the combined state, the first
A clamp mounting bracket 30 in which the rear end is inserted and fixed is fastened near the rear end of the outer cylinder 3 of the joint nozzle 1, and one end of the clamp mounting bracket 30 is laterally connected to the front end of the first joint nozzle. A rear end portion of the guide frame 31 extending along the first joint nozzle 1 is fixed, and a pair of guide holes 31a are formed at left and right end portions of a front end of the guide frame 31.

A cylinder body 33a of a clamp cylinder 33 having a piston rod 33b which is horizontally driven by hydraulic pressure is horizontally mounted on a central portion of a mounting plate 32 installed on one side of a front end portion of the guide frame 31. At the same time, the base ends of a pair of tie bars 34, 34 that are horizontally slid horizontally in the upper and lower ends of the mounting plate 32 and slidably inserted into the guide holes 31a of the guide frames 31 are provided. It has been concluded.

At the tips of both tie bars 34, both flange portions 3b and 14b of the outer cylinders 3 and 14 of both joint nozzles 1 and 2, respectively.
The upper and lower end portions of the first clamp member 35 that sandwiches the vicinity of one end of the first clamp member 35 and presses it in the approaching direction are fastened, and the flange portions 3b and 14b are partially fitted in the central portion of the inner end of the first clamp member 35. The engaging groove 35a is provided as a recess.

Piston rod 3 of clamp cylinder 33
When the piston rod 33b advances, the tip of 3b sandwiches the other end portions of both flange portions 3b, 14b of both outer cylinders 3, 14 to press in the approaching direction and the first clamp member 3
5, the central portion of the base end of the second clamp member 36 that holds both flange portions 3b and 14b is connected, and both tie bars 34 are slidably inserted into the upper and lower ends of the second clamp member 36. A meshing groove 36a is formed in the center of the inner end of the second clamp member 36 so that part of the flange portions 3b and 14b of the outer cylinders 3 and 14 are fitted therein.

When the piston rod 33b of the clamp cylinder 33 advances with the joint nozzles 1 and 2 united, the first clamp member 35 moves together with the cylinder body 33a toward the flanges 3b and 14b and the second clamp. The member 36 moves to the flange portions 3b and 14b side together with the piston rod 33b, and the flange portions 3b and 14b of the outer cylinders 3 and 14 are clamped by the clamp members 35 and 36 and pressed in the approaching direction. Both joint nozzles 1 and 2 are clamped with the front and rear seal surfaces 3c and 14c of the outer cylinders 3 and 14 in close contact with each other.

When the piston rod 33b of the clamp cylinder 33 retracts in this state, the first clamp member 35 and the second clamp member 36 move to the flange portions 3b and 14b.
The joint nozzles 1 and 2 in the clamped state are unclamped apart from the position. However, both clamp members 35, 36
May be manually moved back and forth by a lever or the like.

With both joint nozzles 1 and 2 united and clamped by both clamp members 35 and 36,
When discharging the plasticized fluid by melting the synthetic resin material from the discharge flow path T1 of the injection device S into the first internal flow path 5,
The fluid pressure Q2 at the time when both valve rods 9 and 23 start moving becomes larger than the fluid pressure Q1 required for plasticizing the synthetic resin raw material and P2>P1> Q1 × π / 4 (d2 ² −d1 ² ) Since the pressing forces P1 and P2 of both springs 20 and 27 are set so that both valve rods 9 and 23 are stationary, the outlet 7 of the first joint nozzle 1 and the inlet 16 of the second joint nozzle 2 are Each of them is blocked, and the plasticization of the synthetic resin raw material is not affected.

When the injection process is completed after the plasticization is completed, the fluid pressure in the first internal flow path 5 gradually increases, and when the return force (P1 + P2) for pushing back both valve rods 9 and 23 is exceeded, both fluid pressures are increased. The valve rods 9 and 23 start to move, and the fluid pressure continues to rise, so that both valve rods 9 and 23 move to the moving end, and the outlet 7 and the inlet 16 are fully opened.

In this state, the fluid that has risen to the fluid pressure required for injection molding passes through both internal flow paths 5 and 16 and exits 1
It is sent from 8 into the injection flow path R2.

If the fluid pressure when both valve rods 9 and 23 start moving together is Q2, and the fluid pressure sent to the injection flow path R2 is Q3, P1 + P2 = Q2 × π / 4 (d3 ² −d1 ² ) P3 + P4 <Q3 × π / 4 (d4 ² −d1 ² ) P3 <Q3 × π / 4 (d3 ² −d1 ² ) P4 <Q3 × π / 4 (d4 ² −d3 ² ) It P1, P2, P3, P4, Q
The optimum value of 2 is P2 = (1.05 to 1.2) × P1, P3 = (1.
5-2) x P1, P4 = (1.5-2) x P2, Q2 =
(1.2 to 2) x Q1.

When the two valve rods 9 and 23 are advanced, P2> P
1, P4> P3, the force of pushing back the second valve rod 23 is larger than the force of pushing back the first valve rod 9, so that both valve rods 9 and 23 always move in contact with each other. The fluid is prevented from entering between the front end surface of the first valve rod 9 and the rear end surface of the second valve rod 23.

After the molding with the mold K is completed, both internal flow paths 5,
When the fluid pressure in 16 gradually decreases and disappears, and when the fluid pressure falls below (P3 + P4) while the fluid pressure changes from Q3 to O, both valve rods 9 and 23 start to retreat, and As the pressure decreases, the return force applied to both valve rods 9 and 23 decreases as P3 → P1, P4 → P2, and both valve rods 9 and 23 recede. The outlet 7 and the inlet 17 are fully closed in close contact with the seats 8 and 19, respectively. At this time, since P4> P3 and P2> P1, both valve rods 9,
23 always keeps the contact state and retreats, and both valve rods 9, 23
The fluid is prevented from entering the space.

In this state, even if both joint nozzles 1 and 2 in the clamped state are unclamped to retract the first joint nozzle 1 and both joint nozzles 1 and 2 are separated, the outlet 7 of the first joint nozzle 1 and Since the inlet 16 of the second joint nozzle 2 is sealed by both valve rods 9 and 23, the leakage of fluid from the outlet 7 and the inlet 17 is prevented by both valve rods 9 and 23.

Next, the operation and effect of the embodiment having the above-mentioned structure will be described. In this example, a first joint nozzle 1 having a first internal flow channel 5 connected to a discharge flow channel R1 for discharging a fluid, and a first joint flow channel 16 having a second internal flow channel 16 connected to an injection flow channel R2 for receiving a fluid. a second joint nozzle 2 is arranged in coalescence and separable concentric, the first joint nozzle 1 has a contact surface 11 for opening and closing the outlet 7 of the first internal flow passage 5, the first internal channel Receiving fluid pressure in 5
Te first valve rod 9 to move forward and backward in the axial direction, the first placed a spring 20 for pressing the return direction the first valve rod 9, the second joint nozzle 2 of the second internal flow passage 16 Having a contact surface 24 for opening and closing the inlet 17 , both joint nozzles 1 and 2
The rear end face is the first valve when the first valve rod 9 moves back and forth after being united.
Axial with the first valve rod 9 in close contact with the front end face of the rod 9.
The second valve rod 23 that moves back and forth in the opposite direction, and the pressing force of the first spring 20
Has the above pressing force and presses the second valve rod 23 in the returning direction.
2nd spring 27 which is installed,
When the first valve rod 9 retracts,
1. Forming a rear seal surface 3c aligned with the front end surface of the valve rod 9
However, near the center of the rear end surface of the second joint nozzle 2,
When the second valve rod 23 retracts,
When the two joint nozzles 1 and 2 are aligned, the rear seal
Forming a front seal surface 14c that closely contacts the seal surface 3c, and
The first valve rod 9 is retracted on the wall surface around the outlet 7 of the partial flow path 5.
Valve in which the contact surface of the first valve rod 9 is in close contact when retracted to
The wall forming the seat 8 and around the inlet 17 of the second internal channel 16
With the second valve rod 23 retracted to the retracted end, the second valve rod 23
The contact surface 24 of 23 forms a second valve seat 19 in close contact with the contact surface 24.
It

Therefore, if the joint nozzles 1 and 2 are combined,
Front and rear seal surfaces 14c, 3c and both valve rods 9, 23 at the time of body
Are in close contact with each other, and both valve rods are
Both valve rods 9 and 23 work together while 9 and 23 remain in close contact
Since it moves back and forth, from the start of pumping the fluid to the end of pumping, the joint nozzles 1 and 2 and the valve rods 9 and 2 are connected.
It is possible to accurately prevent the confinement and intrusion of the fluid between the three.

When the joint nozzles 1 and 2 are separated, the first valve rod 9 pressed against the first valve seat is hit.
The surface 11 closes the outlet 7 of the first internal flow path 5,
The contact surface 24 of the second valve rod 23 pressed against the two-valve seat 19
The inlet 17 of the second internal channel 16 is sealed by
Then, both internal flows when separating both joint nozzles 1 and 2
Fluid leakage from the connecting portions of the paths 5 and 16 can be properly prevented.

Therefore, the generation of cold slag due to fluid leakage and fluid confinement can be eliminated, molding defects and connection defects due to cold slag can be eliminated, and elimination of leaked fluid and cleaning work can be eliminated. You can

In particular, in so-called mold slide molding, in which the flow path is connected and disconnected for each molded product, the above-mentioned troubles that occur every time the connection and disconnection are made can be solved, so that the work efficiency is improved and the quality of the molded product is improved. Can be stabilized.

Further, in this example, since the two joint nozzles 1 and 2 that have been combined are clamped by the clamp mechanism and pressed in the approaching direction, the front and rear sealing surfaces 3c and 14c of both outer cylinders 3.14 are connected.
It is possible to firmly prevent the fluid from entering between the seal surfaces 3c and 14c.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a flow path connection device showing an embodiment of the present invention.

FIG. 2 is a front view of a clamp mechanism.

FIG. 3 is a side sectional view of both joint nozzles in a separated state.

FIG. 4 is a side sectional view of both joint nozzles showing a state in which both internal flow paths are blocked.

FIG. 5 is a side sectional view of both joint nozzles showing a state in which both internal flow paths are opened.

FIG. 6 is an enlarged cross-sectional view of a main part.

FIG. 7 is a side sectional view of an injection molding machine for explaining a conventional flow path connecting mechanism.

[Explanation of symbols]

 1 1st joint nozzle 2 2nd joint nozzle 5 1st internal flow path 7 outlet 9 1st valve rod 16 2nd internal flow path 17 inlet 20 1st spring 23 2nd valve rod 27 2nd spring

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yutaro Ishiguri, 3-chome, 9-chome, Minato-ku, Nagoya, Aichi Prefecture Sato Iron Works Co., Ltd. (72) Inventor, Hiroshi Miura 3-chome, 9-chome, Minato-ku, Nagoya, Aichi 42, Sato Iron Works Co., Ltd. (72) Inventor Yasuhiro Sato, 42, 3-chome, 9-bancho, Minato-ku, Nagoya, Aichi Prefecture (56) References: JP-A-56-153190 (JP, A)

Claims (1)

[Claims] 1. A first joint nozzle having a first internal flow path connected to a discharge flow path for discharging a fluid, and a second joint flow path having a second internal flow path connected to an injection flow path for receiving a fluid.
Arranged side by side and joint nozzle coalescence and separable concentric, the first joint in the nozzle has a contact surface for opening and closing the outlet of the first internal flow passage, said first internal flow
A first valve rod that moves back and forth in the axial direction by receiving fluid pressure in the passage ,
Installed a first spring that pushes this first valve rod in the return direction.
In the second joint nozzle , there is a contact surface that opens and closes the inlet of the second internal flow path.
The rear end face when the first stem moves back and forth
With the first valve rod in a state of being in close contact with the front end face of the first valve rod,
A second valve rod that both moves back and forth in the axial direction and a second spring that has a pressing force equal to or greater than the pressing force of the first spring and presses the second valve rod in the return direction are installed. Joint noz
The first valve rod retreated near the center of the front end face of the
A rear seal surface aligned with the front end surface of the first valve stem.
Near the center of the rear end face of the second joint nozzle
The rear end of the second valve rod when the second valve rod retracts.
When the two joint nozzles are united,
Forming a front seal surface closely contacting the rear seal surface,
The first valve rod is moved to the retracted end on the wall surface around the outlet of the partial flow path.
In the retracted state, the first valve seat where the contact surface of the first valve rod is in close contact
And formed on the wall surface around the inlet of the second internal flow path.
In the state where the second valve stem is retracted to the retracted end, the hit of the second valve stem is performed.
A flow path connecting device characterized in that a second valve seat whose surface is in close contact is formed .