JPH0133639Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is a coke oven in which a large number of intake and exhaust valves are installed in the middle of a connecting body that connects them to a drive device in order to open and close the intake and exhaust valves. This is related to the tensioner.

(Prior Art) The intake and exhaust valves of a coke oven are connected to a drive device such as a hydraulic device by a connecting body such as a chain, and are opened and closed by this. This chain expands and contracts due to thermal expansion, and its tension changes. If the tension changes, the numerous valves in the coke oven will be out of synchronization, and the chain may break due to excessive tension. In order to adjust the tension of this chain, conventionally, a turnbuckle was interposed in the middle of the chain, and the turnbuckle was adjusted as appropriate by a worker.

(Problems to be Solved by the Invention) The conventional valve opening/closing device described above has the problem that adjustment of the turnbuckle requires manpower and frequent adjustment is not possible.

(Means for Solving the Problems) The present invention is a tensioner installed in a connecting body 23 of a valve opening/closing device, and includes a closed cylinder 2 connected to one connecting body 23, and a tensioner inside the cylinder 2. A rod 8 passes through the piston 5 and one lid 4 of the cylinder 2, has an inner end fixed to the piston 5, and an outer end connected to the other connecting body 23, and the cylinder 2.
An oil passage 11 that passes through the piston 5 so as to communicate between the chambers 2a and 2b on both sides of the piston, and is provided with a poppet valve 12 on its way to block the flow of hydraulic oil above a predetermined speed, and one side of the piston 5 and the cylinder 2. and a push spring 10 interposed between the lid 4 of the
The above-mentioned problems are solved by automatically adjusting the tension of the connecting body 23 by expanding and contracting the compression spring 10, and closing the oil passage 11 by the poppet valve 12 to make the connecting body 23 rigid and transmit power when the connecting body 23 is pulled. It is something.

(Operation) The above technical means operates as follows. When the connecting body 23 expands due to thermal expansion, the piston 5 is gradually pushed to the left in FIG. Flows into chamber 2b,
Rod 8 is retracted and absorbs the deflection. Also,
When the temperature of the connecting body 23 decreases and it gradually contracts, the piston 5 is slowly pulled to the right, and the oil in the right chamber 2b passes through the poppet valve 12 and the oil passage 11 without resistance and flows into the left chamber 2a. into the pressure spring 10
is compressed and the rod 8 is expanded to absorb the contraction of the connecting body 23. Therefore, the tension of the connecting body 23 is automatically and constantly adjusted to a constant value. On the other hand, coke oven 20
When the connecting body 23 is pulled to open and close the intake/exhaust valve 21, the pulling operation speed is approximately 1.5 cm/
sec, which is considerably larger than the displacement speed of the connecting body 23 due to thermal expansion.
The poppet valve 12 closes and blocks the oil passage 11 due to the flow resistance of the oil trying to move to the oil passage a. Therefore, the piston 5 cannot move, and the cylinder 2 and rod 8
is made rigid and reliably transmits the tensile action of the connecting body 23.

(Effect of the invention) The present invention configured as described above automatically adjusts the slow expansion and contraction of the connecting body 23 due to thermal expansion to a constant constant through the expansion and contraction of the compression spring 10, and makes the connecting body 23 a rigid body during the necessary tensioning operation. This has the effect of being able to reliably transmit this information.

(Example) An example of the present invention will be described below with reference to the figures. As shown in FIG. 2, the tensioner 1 of the present invention is interposed in the middle of a connecting body 23 that connects a large number of intake and exhaust valves 21, 21, . . . of a coke oven 20 and a drive device 22 that operates them. Tensioner 1 is, for example, the first
It is configured as shown in the figure. The cylinder 2 is provided with lids 3 and 4 at both ends, and is divided by a piston 5 into a left chamber 2a and a right chamber 2b. A handle 7 is provided on the outside of the lid 3 via a housing 6. The handle 7 is connected to one end of a connecting body 23 such as a chain. The rod 8 slidably passes through the lid 4, has an inner end fixed to the piston 5, and an outer end connected via a turnbuckle 9 to the other end of a connecting body 23 such as a chain.
The oil tank 16 has both end plates 16a and 16b fitted with bellows 16.
They are connected by c and can be expanded and contracted in the axial direction.
The oil tank 16 is housed in the housing 6 and has a lid 3.
It communicates with the left side chamber 2a of the cylinder 2 via an oil passage 3a that passes through the cylinder. A push spring 10 is housed between the piston 5 and the cylinder lid 4 and always biases the rod 8 in the retracting direction. The left and right chambers 2 a and 2 b of the cylinder 2 communicate with each other via an oil passage 11 that passes through the piston 5 . A poppet valve 12 is provided at the end of the oil passage 11. The poppet valve 12 operates by sensing a rapid flow of oil in the oil passage 11 (in this embodiment, the speed of the piston 5 is 0.4 cm/sec or more), and closes the oil passage 11. The left and right side chambers 2a and 2b are also in communication via a bypass pipe 13. A needle valve 14 is provided at the end of the bypass pipe 13 and can be opened and closed.
The outer cylinder 15 has one end located outside the cylinder 2 and fixed to the rod 8, and the other end is open and accommodates one end of the cylinder 2 so as to be able to move in and out of the cylinder 2. A scale 17 is attached to the outer periphery of the cylinder 2, and cooperates with the outer cylinder 15 to indicate the position of the rod 8.

In the case of this embodiment, when installing, open the needle valve 14 to free the piston 5, and adjust the turnbuckle 9 to the assumed thermal change position of the connecting body 23.
After adjusting the position of the piston 5 and setting the position of the piston 5, the needle valve 14 is closed again. When the connecting body 23 thermally expands, the push spring 10 gradually restores its original shape and the piston 5
moves slowly to the left. Since the displacement is slow, the poppet valve 12 does not operate and the oil freely flows through the passage 1.
1 and flows between the left and right chambers 2a and 2b. When the connecting body 23 contracts, the operation is reversed. Connector 23 to operate valve 21 of coke oven 20
When the piston 5 is pulled, the poppet valve 12 closes and locks the oil passage 11 because the piston 5 tries to displace rapidly. The tensioning movement of the coupling body 23 is therefore reliably transmitted to the valve 21. Surplus hydraulic oil due to the movement of the piston 5 flows into the oil tank 16. Various other means for storing excess oil can be considered.

[Brief explanation of the drawing]

FIG. 1 is a front view, and FIG. 2 is a schematic diagram showing the installed state. 1...Tensioner, 2...Cylinder, 2a...
...Left ventricle, 2b...Right ventricle, 3, 4...Lid, 5
...Piston, 8...Rod, 10...Press spring,
11...Oil passage, 12...Poppet valve, 20...
Coke oven, 21... intake/exhaust valve, 22... drive device, 23... connection body.

Claims (1)

[Scope of utility model registration request] A tensioner that is installed in the middle of a connecting body that connects a large number of intake and exhaust valves of a coke oven to a drive device in order to open and close them simultaneously,
A closed cylinder connected to one connecting body, a piston inside the cylinder, a rod passing through one lid of the cylinder, having an inner end fixed to the piston and an outer end connected to the other connecting body, and a rod inside the cylinder. An oil passage passing through the piston so as to communicate between both chambers of the piston and having a poppet valve disposed in the middle thereof to shut off a rapid flow of hydraulic oil exceeding a predetermined speed, and interposed between the piston and the one lid of the cylinder. 1. A tensioner for an intake/exhaust valve opening/closing device for a coke oven, characterized in that the tensioner is equipped with a pressed spring and absorbs tension and slack in a connecting body due to thermal expansion.